Screw sleeve locking type tensioning control device

Abstract

The invention discloses a threaded sleeve locking type tensioning control device, and relates to the field of mechanical tensioning. According to the technical scheme, the threaded sleeve locking type tensioning control device comprises an outer cylinder body, an inner cylinder body and a pull rod; an inner cavity of the outer cylinder body is in sliding fit with the inner cylinder body; the outer cylinder body is provided with a first thrust piece for pushing the inner cylinder body backwards or forwards; an inner cavity of the inner cylinder body is in sliding fit with an inner piston, the inner piston is connected with the rear end of the pull rod, and a pre-pressing spring is arranged between the inner piston and the front end of the inner cylinder body. A threaded sleeve locking assembly is arranged between the inner cylinder body and the outer cylinder body. By the adoption of the threaded sleeve locking type tensioning control device, the object to be tensioned can be tensioned automatically or manually. The threaded sleeve locking type tensioning control device is simple in structure, strong in tensioning force, high in reliability, sustainable, convenient to remotely check the working state of the threaded sleeve locking type tensioning control device, and suitable for anti-slip locking of railway vehicles.

Description

Technical Field

[0001] The invention relates to the field of mechanical tightening, and in particular to a screw sleeve locking type tightening control device. Background Art

[0002] Railway vehicle parking brake refers to the stopping method used when the vehicle is stationary without wind pressure, and its purpose is to prevent the vehicle from rolling away on its own.

[0003] The vehicles running on the railway are composed of the locomotive in front and the vehicles connected at the rear. The entire vehicle uses compressed air to drive the mechanical brake device to brake, slow down or stop. The specific train pipe is connected to the auxiliary air cylinder through the distribution valve on each vehicle, and the auxiliary air cylinder is connected to the brake cylinder through the distribution valve. The output end of the brake cylinder is connected to the brake shoe through the mechanical brake device. When braking, the compressed air in the auxiliary air cylinder drives the brake cylinder, and then drives the brake shoe to close to the wheel through the mechanical brake device. Because the rear-connected vehicle has no compressed air source, it is necessary to rely on the front locomotive to fill the auxiliary air cylinders of each vehicle in the rear through the train pipe air duct in sequence, and then the brake cylinder of the rear vehicle can generate braking force. When the locomotive is separated from the rear vehicle, the braking force of the rear vehicle is maintained by the compressed air retained by itself. However, if the vehicle is separated from the locomotive for a long time, the compressed air retained in the vehicle air brake device will leak naturally, causing the vehicle to gradually lose its braking force. If a vehicle stops on a slope and no anti-slip measures are taken, the parked vehicle will automatically slide, causing major accidents such as damaging switches, crashing into other vehicles, hitting people, or even overturning.

[0004] The patent document with the announcement number CN111923953B announces a railway vehicle parking brake device that can be stopped automatically and manually. The solution realizes braking by driving the core rod to move telescopically through the first piston in the parking brake cylinder, and specifically drives the brake shoe to approach the wheel through the deformation of the first spring. However, the solution is only applicable to vehicles with a small wheel shoe gap (the gap between the vehicle wheel and the brake shoe), while for railway vehicles with a large wheel shoe gap, the spring needs to be stretched more to eliminate the large wheel shoe gap, and the brake shoe needs to provide sufficient pressure on the wheel after the wheel shoe is close to the wheel, that is, the pressure generated after the wheel shoe is close to the wheel is the effective braking force. However, in the announced solution, if the vehicle wheel shoe gap is large, most of the elastic force of the spring will be basically released in the process of driving the brake shoe close to the wheel, so that the pressure on the wheel after the brake shoe and the wheel are close is obviously insufficient, and it cannot meet the braking force requirements of the railway vehicle with a large wheel shoe gap when parking on a ramp. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a screw sleeve locking tensioning control device (hereinafter referred to as: tensioning device), which tightens the railway vehicle mechanical brake device by compressing the spring + locking when the inner cylinder body retracts. It can not only meet the slope parking braking requirements of railway vehicles with various wheel shoe gaps, but also has strong braking force, and the braking force will not decay with the extension of braking time. It is also suitable for tensioning and controlling various ropes, chains, power lines, pipelines, conveyor belts, mechanical transmission devices, riveting devices, brake devices, etc.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a screw sleeve locking type tension control device, comprising an outer cylinder body, an inner cylinder body and a locking assembly;

[0007] The inner cavity of the outer cylinder body is slidably matched with the inner cylinder body, and the inner cylinder body and the outer cylinder body are matched with a key and a keyway, so that the inner cylinder body can slide axially relative to the outer cylinder body but cannot rotate circumferentially; the outer wall of the inner cylinder body is provided with a locking external thread;

[0008] The outer cylinder body is provided with a first thrust member that axially pushes the inner cylinder body to slide;

[0009] The inner cavity of the inner cylinder body is slidably matched with an inner piston, the inner piston is connected to the rear end of the pull rod, the front end of the pull rod passes through the front end surfaces of the inner cylinder body and the outer cylinder body and then extends to the outside of the outer cylinder body, and the pull rod is slidably matched with the inner cylinder body and the outer cylinder body respectively;

[0010] A pre-compression spring is provided between the inner piston and the front end of the inner cylinder;

[0011] A locking assembly is provided between the inner cylinder body and the outer cylinder body;

[0012] The locking assembly includes an annular locking gear and a locking pin;

[0013] The outer cylinder body is rotatably equipped with an annular locking gear, the inner wall of the annular locking gear is provided with a locking internal thread adapted to the locking external thread, the outer wall of the annular locking gear is provided with external teeth, the locking pin is slidably equipped with the outer cylinder body, and the sliding direction of the locking pin points to the external teeth or away from the external teeth;

[0014] The outer cylinder body is provided with a second thrust member for driving the locking pin to slide.

[0015] Preferably, the second thrust member comprises a locking cylinder and a locking pin;

[0016] The outer cylinder body is fixed with a locking cylinder, and a pressure chamber is arranged in the locking cylinder;

[0017] A pressure piston is slidably fitted in the pressure chamber, the pressure piston is fixed to the rear end of the locking pin, the front end of the locking pin passes through the front end of the locking cylinder, and the locking pin is slidably fitted to the front end of the locking cylinder;

[0018] A pressurizing hole is arranged at the front end of the pressure chamber, and the pressurizing hole is connected to the pressure control device. A first return spring is arranged between the pressure piston and the locking cylinder, and the first return spring pushes the front end of the locking pin toward the outer teeth direction of the annular locking gear.

[0019] Preferably, the rear end of the locking cylinder is docked with a hollow protrusion, the rear end of the protrusion is provided with crossed deep grooves and shallow grooves, the rear end of the locking pin extends outward from the hollow protrusion, and the rear end of the locking pin is radially provided with a handle rod adapted to the deep groove or the shallow groove.

[0020] Preferably, the pull rod includes a barrel rod and a core rod, the core rod is arranged inside the barrel rod, a swing gap is left between the core rod and the barrel rod, the rear end of the barrel rod is fixed to the inner piston, the inner piston is provided with a swing hole connected to the rear end of the barrel rod, the rear end of the core rod is penetrated by the swing hole, and the rear side of the inner piston is provided with a swing head fixed to the rear end of the core rod.

[0021] The tensioning device is applied to the parking brake of railway vehicles. The core rod of the tensioning device and the driving end of the vehicle mechanical brake device can be connected by a chain, a rope or a guide frame with a slot, so that when the tensioning device is pulled backward, the components of the vehicle mechanical brake device are driven to move, so that the brake shoes hold the wheels tightly and the vehicle is parked.

[0022] A swing gap is left between the core rod and the barrel rod, so that the core rod and the swing head can swing relative to the inner piston and the barrel rod, that is, when the tensioning device is fixed, the deflection angle of the core rod can be automatically adjusted according to the up, down, left and right positions of the driving end of the vehicle mechanical brake device. Therefore, the ball locking type tensioning control device has low position accuracy requirements relative to the driving end of the vehicle mechanical brake device, which is convenient for on-site installation and use.

[0023] Preferably, the first thrust member comprises a first hydraulic cylinder, the first hydraulic cylinder is provided with a first liquid inlet hole, the first hydraulic cylinder is fixed relative to the outer cylinder body, and the output end of the first hydraulic cylinder is located inside the outer cylinder body and points backward to the front end of the inner cylinder body;

[0024] The pressure chamber is a hydraulic chamber, and the pressure piston is a hydraulic piston; the pressurizing hole is a second liquid inlet hole, and the second liquid inlet hole is located at the front end of the hydraulic chamber; the pressure control device includes an oil pressure piece, and the second liquid inlet hole is connected to the oil pressure piece;

[0025] Preferably, the tensioning device is provided with a pressure control device, and the pressure control device is a hydraulic control system, which includes an oil pressure pump, a relief valve, a two-position three-way reversing valve of the liquid circuit, a first liquid circuit on-off valve, a second liquid circuit on-off valve, a third liquid circuit on-off valve and a fourth liquid circuit on-off valve.

[0026] The oil pressure pump, the two-position three-way reversing valve of the liquid circuit, the first liquid circuit on-off valve, the second liquid circuit on-off valve, the third liquid circuit on-off valve and the fourth liquid circuit on-off valve can be manually, pneumatically, electrically or other mechanically driven.

[0027] The oil return port of the oil pressure pump is connected to one end of the first liquid pipe, the other end of the first liquid pipe is connected to one end of the second liquid pipe through the first liquid circuit on-off valve, the other end of the second liquid pipe is connected to one end of the third liquid pipe through the second liquid circuit on-off valve, and the other end of the third liquid pipe is connected to the first liquid inlet hole;

[0028] The oil outlet of the oil pressure pump is connected to one end of the fourth liquid pipe;

[0029] One end of the fifth liquid pipe is connected to the other end of the fourth liquid pipe or one end of the sixth liquid pipe through a two-position three-way reversing valve of the liquid circuit;

[0030] The other end of the sixth liquid pipe is connected to one end of the seventh liquid pipe through the fourth liquid path on-off valve, and the other end of the seventh liquid pipe is connected to the first liquid pipe;

[0031] The other end of the fifth liquid pipe is connected to one end of the eighth liquid pipe through the third liquid path on-off valve, and the other end of the eighth liquid pipe is connected to the second liquid inlet hole;

[0032] The second liquid pipe and the fifth liquid pipe are connected through a ninth liquid pipe, the first liquid pipe and the fourth liquid pipe are connected through a tenth liquid pipe, and the tenth liquid pipe is provided with an overflow valve;

[0033] A display device is included, and the display device includes a slide tube, a slide rod, a sliding piston and an indicator plate. The sliding piston is slidably fitted in the slide tube, and the side wall of the sliding piston is provided with a spring clamping bead, and the inner walls at both ends of the slide tube are respectively provided with annular clamping grooves for the spring clamping bead to be clamped, one end of the slide rod is fixed to the sliding piston, and the other end of the slide rod slides and extends to the outside of the slide tube, and the indicator plate is provided on the slide rod outside the slide tube, and the end of the slide tube close to the indicator plate is provided with a first detection hole connected to the slide tube, and the end of the slide tube away from the indicator plate is provided with a second detection hole connected to the slide tube; the first detection hole is connected to the sixth liquid pipe, and the second detection hole is connected to the third liquid pipe.

[0034] In order to reduce the number of external hydraulic pipeline connections, the first hydraulic cylinder, the locking cylinder and the sliding cylinder may also be independently provided with oil pumps to drive the movement of the hydraulic piston in the first hydraulic cylinder, the hydraulic piston in the locking cylinder and the sliding piston in the sliding cylinder respectively;

[0035] Preferably, the first thrust member comprises a first air inlet hole and a third air inlet hole, the first air inlet hole is arranged at the front end of the outer cylinder body, and the third air inlet hole is arranged at the rear end of the outer cylinder body;

[0036] The outer cylinder body comprises a front section and a rear section, the front end outer wall of the inner cylinder body is provided with a front piston which is slidably matched with the inner wall of the front section, and the rear end outer wall of the inner cylinder body is provided with a rear piston which is slidably matched with the inner wall of the rear section;

[0037] A second ventilation hole is provided in the middle of the front section;

[0038] When the inner cylinder body slides to the front extreme position, the second air exchange hole is separated from the first air inlet hole;

[0039] When the inner cylinder body slides to the rear limit end position, the second air exchange hole is connected with the first air inlet hole;

[0040] When the inner cylinder body slides between the front extreme position and the rear extreme position, either the second air exchange hole is separated from the first air inlet hole, or the second air exchange hole is connected to the first air inlet hole;

[0041] The pressure chamber is an air pressure chamber, and the pressure piston is an air pressure piston; the pressurizing hole is a second air inlet hole, and the second air inlet hole is located at the front end of the air pressure chamber, and a vent hole is provided at the rear end of the air pressure chamber, and a first air exchange hole is provided in the middle of the air pressure chamber; when the air pressure piston is located at the rear end of the air pressure chamber, the first air exchange hole is connected to the second air inlet hole through the locking cylinder, and the first air exchange hole is disconnected from the vent hole; when the air pressure piston is located at the front end of the air pressure chamber, the first air exchange hole is connected to the vent hole through the locking cylinder, and the first air exchange hole is disconnected from the second air inlet hole.

[0042] Preferably, a third ventilation hole is provided at the front of the rear section, and when the inner cylinder body slides to the front extreme position, the third ventilation hole is connected with the third air inlet hole; when the inner cylinder body slides to the rear extreme position, the third ventilation hole is separated from the third air inlet hole;

[0043] Preferably, the tensioning device is provided with a pressure control device, and the pressure control device is an intermittent air supply type air pressure system, and its structure is as follows:

[0044] The first air inlet is connected to one end of the first air pipe, and the other end of the first air pipe is connected to the atmosphere through the first air path on-off valve. The air hole of the first air path on-off valve connected to the atmosphere is provided with a fourth shrink plug. One end of the first air path on-off valve is provided with a first control end, and the other end of the first air path on-off valve is provided with a second control end and a second return spring. The first air pipe is connected to the first control end, and the second control end is connected to one end of the second air pipe. Only when there is pressurized air at the first control end, the first air path on-off valve connects the first air pipe to the atmosphere. In other cases, the first air path on-off valve disconnects the first air pipe from the atmosphere.

[0045] The other end of the second air pipe is connected to the atmosphere or one end of the third air pipe through the first air circuit two-position three-way reversing valve, the first air circuit two-position three-way reversing valve is provided with a third control end and a third return spring, the third control end is connected to one end of the twelfth air pipe, when the third control end has pressurized air, the third control end pushes the valve core to connect the second air pipe with the atmosphere, and the second air pipe is isolated from the third air pipe, when the third control end has no pressurized air, the third return spring pushes the valve core to connect the second air pipe with the third air pipe, and the second air pipe is isolated from the atmosphere; the other end of the third air pipe is connected to one end of the fourth air pipe or one end of the fifth air pipe through the second air circuit two-position three-way reversing valve, the second air circuit two-position three-way reversing valve is provided with a fourth control end and a fifth control end, the fourth control end is connected to one end of the fourth air pipe, the fifth control end is connected to one end of the fifth air pipe, whichever of the fourth control end and the fifth control end has pressurized air, the air pipe connected to the control end is connected to the other end of the third air pipe;

[0046] The other end of the fourth air pipe is connected to the atmosphere or one end of the sixth air pipe through the first air circuit delayed two-position three-way reversing valve, the first air circuit delayed two-position three-way reversing valve is provided with a sixth control end and a fourth return spring, the sixth control end is connected to one end of the sixth air pipe through the first shrink plug; when the return force of the fourth return spring is greater than the thrust of the pressurized air at the sixth control end, the first air circuit delayed two-position three-way reversing valve connects the fourth air pipe with the sixth air pipe, and the fourth air pipe is disconnected from the atmosphere; when the thrust of the pressurized air at the sixth control end is greater than the return force of the fourth return spring, the first air circuit delayed two-position three-way reversing valve disconnects the fourth air pipe from the sixth air pipe, and the fourth air pipe is connected to the atmosphere;

[0047] The other end of the sixth air pipe is connected to the atmosphere or one end of the seventh air pipe through the third air circuit two-position three-way reversing valve, and the other end of the seventh air pipe is connected to the first air cylinder;

[0048] The first air cylinder is connected to one end of an eighth air pipe, the other end of the eighth air pipe is connected to the train pipe, and the eighth air pipe is provided with a first check valve that only allows gas to flow to the first air cylinder;

[0049] The other end of the fifth air pipe is connected to the atmosphere or one end of the ninth air pipe through the second air circuit delayed two-position three-way reversing valve, the second air circuit delayed two-position three-way reversing valve is provided with a seventh control end and a fifth return spring, the seventh control end is connected to one end of the ninth air pipe through the second shrink plug, when the return force of the fifth return spring is greater than the thrust of the air pressure at the seventh control end, the second air circuit delayed two-position three-way reversing valve connects the fifth air pipe with the ninth air pipe, and the fifth air pipe is disconnected from the atmosphere, when the thrust of the pressurized air at the seventh control end is greater than the return force of the fifth return spring, the second air circuit delayed two-position three-way reversing valve disconnects the fifth air pipe from the ninth air pipe, and the fifth air pipe is connected to the atmosphere;

[0050] The other end of the ninth air pipe is connected to one end of the tenth air pipe or the atmosphere through the fourth air circuit two-position three-way reversing valve, the other end of the tenth air pipe is connected to the eighth air pipe, the third air circuit two-position three-way reversing valve and the fourth air circuit two-position three-way reversing valve share an eighth control end and a sixth return spring, the eighth control end is connected to the eighth air pipe through the eleventh air pipe, the eighth control end is connected to the brake cylinder through a connecting pipe, the connecting pipe and the eleventh air pipe independently control the eighth control end, the first check valve is located between the tenth air pipe and the eleventh air pipe When the thrust of the eighth control end is greater than the reset force of the sixth reset spring, the eighth control end pushes the valve core to disconnect the sixth air pipe from the seventh air pipe, the sixth air pipe is connected to the atmosphere, the ninth air pipe is connected to the tenth air pipe, and the ninth air pipe is disconnected from the atmosphere; when the thrust of the eighth control end is less than the reset force of the sixth reset spring, the sixth reset spring pushes the valve core to connect the sixth air pipe to the seventh air pipe, the sixth air pipe is disconnected from the atmosphere, the ninth air pipe is disconnected from the tenth air pipe, and the ninth air pipe is connected to the atmosphere;

[0051] The other end of the twelfth air pipe is connected to one end of the thirteenth air pipe or one end of the fourteenth air pipe through the fifth air circuit two-position three-way reversing valve, the fifth air circuit two-position three-way reversing valve is provided with a ninth control end and a tenth control end, the ninth control end is connected to one end of the thirteenth air pipe, the other end of the thirteenth air pipe is connected to the second air exchange hole, the tenth control end is connected to one end of the fourteenth air pipe, the other end of the fourteenth air pipe is connected to the third air exchange hole, the ninth control end and the tenth control end have pressurized air, the air pipe connected to the control end is connected to the other end of the twelfth air pipe, and the twelfth air pipe is provided with a third shrink plug;

[0052] The first air exchange hole is connected with one end of the fifteenth air pipe, and the other end of the fifteenth air pipe and the two air holes are connected to one end of the sixteenth air pipe or one end of the seventeenth air pipe through the first two-position five-way reversing valve, the other end of the sixteenth air pipe is connected to the first air pipe, and the other end of the seventeenth air pipe is connected to the third air inlet hole; the first two-position five-way reversing valve is provided with an eleventh control end and a twelfth control end, the eleventh control end is connected to the fifth air pipe through the eighteenth air pipe, and the twelfth control end is connected to the fourth air pipe through the nineteenth air pipe. When there is pressurized air at the eleventh control end, the valve core is pushed to move, so that the fifteenth air pipe is connected to the seventeenth air pipe, and the sixteenth air pipe is connected to the atmosphere. When there is pressurized air at the twelfth control end, the valve core is pushed in the reverse direction, so that the fifteenth air pipe is connected to the sixteenth air pipe, and the seventeenth air pipe is connected to the atmosphere, and the second air inlet hole is connected to the second air pipe through the twentieth air pipe.

[0053] The air vent is connected to one end of the thirty-ninth air pipe, and the other end of the thirty-ninth air pipe, the first exhaust hole, and the third exhaust hole are connected to one end of the fortieth air pipe or one end of the forty-first air pipe through the second two-position five-way reversing valve; the second two-position five-way reversing valve is provided with a sixteenth control end and a seventeenth control end, the sixteenth control end is connected to the fourteenth air pipe through the forty-second air pipe, and the seventeenth control end is connected to the thirteenth air pipe through the forty-third pipe; when there is pressurized air at the sixteenth control end, the valve core is pushed to move, so that the thirty-ninth air pipe is connected to the forty-first air pipe, and the fortieth air pipe is connected to the first exhaust hole, and when there is pressurized air at the seventeenth control end, the valve core is pushed in the reverse direction, so that the thirty-ninth air pipe is connected to the fortieth air pipe, and the forty-first air pipe is connected to the third exhaust hole; the other end of the fortieth air pipe is connected to the second detection hole, and the other end of the forty-first air pipe is connected to the first detection hole.

[0054] Preferably, a display device is included, and the display device includes a slide cylinder, a slide rod, a sliding piston and an indicator plate, the slide cylinder is slidably matched with the sliding piston, the side walls of the sliding piston are provided with spring beads, and the inner walls at both ends of the slide cylinder are respectively provided with annular grooves for the spring beads to be trapped. One end of the slide rod is fixed to the sliding piston, and the other end of the slide rod slides and extends to the outside of the slide cylinder, and the slide rod outside the slide cylinder is provided with the indicator plate, the end of the slide cylinder close to the indicator plate is provided with a first detection hole connected to the slide cylinder, and the end of the slide cylinder away from the indicator plate is provided with a second detection hole connected to the slide cylinder; the inner walls of the front and rear sides of the slide cylinder are respectively provided with longitudinal bypass grooves for ventilation, when the sliding piston slides to the front extreme position, the bypass groove can connect the middle chamber of the slide cylinder with the first detection hole, and when the sliding piston slides to the rear extreme position, the bypass groove can connect the middle chamber of the slide cylinder with the second detection hole.

[0055] Preferably, the tensioning device is provided with a pressure control device, and the pressure control device is a continuous air supply type air pressure system, and its structure is as follows:

[0056] Preferably, one end of the twenty-second air pipe is connected to the third air inlet hole, the other end of the twenty-second air pipe is connected to one end of the twenty-third air pipe or the atmosphere through the second-position three-way reversing valve of the seventh air path, the other end of the twenty-third air pipe is connected to the first air exchange hole of the locking cylinder, the second air inlet hole is connected to one end of the twenty-fourth air pipe, one end of the twenty-fifth air pipe is connected to the other end of the twenty-fourth air pipe or one end of the twenty-sixth air pipe through the second-position four-way reversing valve, wherein when the twenty-fifth air pipe is connected to the other end of the twenty-fourth air pipe, one end of the twenty-sixth air pipe is connected to the atmosphere; the twenty-fifth air pipe is isolated from the twenty-fourth pipe, and when it is connected to one end of the twenty-sixth air pipe, the passage of the twenty-sixth air pipe and the atmosphere is isolated; the other end of the twenty-fifth air pipe is connected to the second air cylinder, the second air cylinder is connected to one end of the twenty-seventh air pipe, the other end of the twenty-seventh air pipe is connected to one end of the twenty-eighth air pipe through the second check valve, the second check valve only allows gas to flow from the twenty-eighth air pipe to the twenty-seventh air pipe, and the other end of the twenty-eighth air pipe is connected to an external air source;

[0057] One end of the thirty-seventh air pipe is connected to the twenty-fourth air pipe, and the other end of the thirty-seventh air pipe is connected to the atmosphere through the fourth airway on-off valve;

[0058] One end of the 32nd air pipe is connected to the other end of the 26th air pipe or the atmosphere through the 8th air circuit two-position three-way reversing valve, the air hole of the 8th air circuit two-position three-way reversing valve connected to the atmosphere is provided with a sixth shrink plug, and the other end of the 32nd air pipe is connected to the first air inlet;

[0059] The eighth gas path two-position three-way reversing valve is provided with a thirteenth control end and a seventh return spring. When the thrust of the thirteenth control end is greater than the elastic force of the seventh return spring, the thirteenth control end pushes the valve core to move and compress the seventh return spring, so that the thirty-second gas pipe is isolated from the thirty-first gas pipe, and the thirty-second gas pipe is connected to the atmosphere. When the thrust of the thirteenth control end is less than the elastic force of the seventh return spring, the seventh return spring pushes the valve core to move in the reverse direction, the thirty-second gas pipe is connected to the thirty-first gas pipe, and the thirty-second gas pipe is disconnected from the atmosphere.

[0060] The thirteenth control end is connected to one end of the thirty-third air pipe, the other end of the thirty-third air pipe is connected to one end of the thirty-fourth air pipe or the atmosphere through the sixth air path two-position three-way reversing valve, the thirty-third air pipe is provided with a fifth shrink plug, and the other end of the thirty-fourth air pipe is connected to the twenty-third air pipe;

[0061] The fourth air circuit on-off valve and the sixth air circuit two-position three-way reversing valve share a fourteenth control end and an eighth return spring, the fourteenth control end is connected to one end of the thirty-fifth air pipe, and the other end of the thirty-fifth air pipe is connected to the second air exchange hole; when there is pressurized air at the fourteenth control end, the fourteenth control end pushes the valve core to move and compress the eighth return spring, the thirty-third air pipe is connected to the thirty-fourth air pipe, the thirty-third air pipe is disconnected from the atmosphere, and the thirty-seventh air pipe is connected to the atmosphere; when there is no pressurized air at the fourteenth control end, the eighth return spring pushes the valve core to move to disconnect the thirty-third air pipe from the thirty-fourth air pipe, the thirty-third air pipe is connected to the atmosphere, and the thirty-seventh air pipe is isolated from the atmosphere;

[0062] The two-position four-way reversing valve and the seven-position three-way reversing valve share a fifteenth control end and a ninth return spring, the fifteenth control end is connected to one end of the thirty-sixth air pipe, and the other end of the thirty-sixth air pipe is connected to the twenty-eighth air pipe; when there is pressurized air at the fifteenth control end, the fifteenth control end pushes the valve core to move and compress the ninth return spring, the twenty-second air pipe is connected to the twenty-third air pipe, the twenty-second air pipe is disconnected from the atmosphere, the twenty-fifth air pipe is connected to the twenty-fourth air pipe, and the twenty-sixth air pipe is connected to the atmosphere; when there is no pressurized air at the fifteenth control end, the ninth return spring pushes the valve core to move, the twenty-second air pipe is connected to the atmosphere, the twenty-third air pipe is disconnected from the twenty-second air pipe, the twenty-fifth air pipe is connected to the twenty-sixth air pipe, the twenty-sixth air pipe is disconnected from the atmosphere, and the passage between the twenty-fourth air pipe and the twenty-fifth air pipe is disconnected;

[0063] The air storage cylinder is connected to the twenty-third air pipe through the thirty-eighth air pipe.

[0064] The air vent is connected to one end of the forty-fourth air pipe, and one end of the forty-fifth air pipe is connected to the other end of the forty-fourth air pipe or the fourth exhaust hole through the ninth air circuit two-position three-way reversing valve; the ninth air circuit two-position three-way reversing valve is provided with an eighteenth control end and a nineteenth control end, the eighteenth control end is connected to the thirty-fifth air pipe through the forty-ninth air pipe, and the nineteenth control end is connected to one end of the forty-seventh air pipe; when there is pressurized air at the eighteenth control end, the valve core is pushed to move so that the forty-fourth air pipe is connected to the forty-fifth air pipe, and when there is pressurized air at the nineteenth control end, the valve core is pushed in the reverse direction so that the forty-fifth air pipe is connected to the fourth exhaust hole; the other end of the forty-fifth air pipe is connected to the second detection hole, the other end of the forty-seventh air pipe is connected to one end of the forty-sixth air pipe and one end of the forty-eighth air pipe, the other end of the forty-sixth air pipe is connected to the twenty-second air pipe, and the other end of the forty-eighth air pipe is connected to the first detection hole.

[0065] Preferably, a display device is included, and the display device includes a slide cylinder, a slide rod, a sliding piston and an indicator plate, the sliding piston is slidably fitted in the slide cylinder, the side wall of the sliding piston is provided with a spring card, the inner walls at both ends of the slide cylinder are respectively provided with annular card grooves for the spring card, one end of the slide rod is fixed to the sliding piston, and the other end of the slide rod slides and extends to the outside of the slide cylinder, the slide rod outside the slide cylinder is provided with the indicator plate, the end of the slide cylinder close to the indicator plate is provided with a first detection hole connected to the slide cylinder, and the end of the slide cylinder away from the indicator plate is provided with a second detection hole connected to the slide cylinder; the rear inner wall of the slide cylinder is provided with a longitudinal bypass groove for ventilation, and when the sliding piston slides to the rear extreme position, the bypass groove can connect the middle chamber of the slide cylinder with the second detection hole.

[0066] Preferably, the display device includes a detection switch, a light sensor, an indicator light and a power supply. A contact rod is provided at the other end of the sliding rod. The detection switch is used to detect the position of the contact rod. The detection switch, light sensor, indicator light and power supply form a series circuit.

[0067] Advantages of the present invention:

[0068] 1. Large tensioning force without attenuation. When implementing the tensioning, this solution adopts the tensioning method of eliminating the idle travel first, waiting for the spring to be compressed, and then mechanically locking after the core rod is tightened, so that the external tensioning force will not weaken with the increase of the idle travel, and will not attenuate due to the leakage of compressed air. If used in the anti-skid of railway vehicles, it can ensure that the parking braking force of the vehicle will not attenuate with the increase of the wheel shoe spacing or the passage of time;

[0069] 2. High degree of automation. The present invention can automatically tighten or loosen the brake by manually controlling the change of air pressure of the external air source. For example, when used in the parking brake of railway vehicles, it can automatically realize the conversion between air brake and mechanical parking brake according to the change of air pressure of the existing train pipe and brake cylinder of the railway vehicle;

[0070] 3. Safe and reliable. The automatic conversion between air brake and mechanical parking brake ensures the continuity of the vehicle's parking brake force and prevents the interruption of parking brake force;

[0071] 4. Convenient and flexible manual operation. The present invention is equipped with a hydraulic manual operation mode and a manual quick release handle, which is convenient for on-site personnel to manually tighten or loosen the operation. It is equipped with a pressure regulator and a relief valve, which can automatically adjust the air pressure or hydraulic pressure of the control system to achieve the effect of adjusting the output tension force. If used in the parking brake of railway vehicles, it can facilitate the braking and release operations when the vehicle position is moved manually on site, and it is convenient to adjust the parking brake force of the vehicle;

[0072] 5. Convenient for supervision. The present invention is provided with a display device. If used in the parking brake of railway vehicles, the parking brake implementation status can be automatically displayed on both sides of the vehicle after the parking brake is implemented, which is convenient for on-site operators to supervise remotely;

[0073] 6. Automatically adjust the coaxiality. The pull rod adopts a hollow double-layer structure, and the core rod can swing in any direction inside the tube rod, which is convenient for automatically adjusting the up, down, left, and right positions of the traction point at the front end of the core rod according to the position of the driving end of the vehicle's mechanical brake device, so that it maintains the necessary coaxiality with the driving end of the vehicle's mechanical brake device, which is convenient for on-site installation; BRIEF DESCRIPTION OF THE DRAWINGS

[0074] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only ten of the drawings of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0075] Figure 1 It is a longitudinal cross-sectional view of the assembly of the inner cylinder body and the outer cylinder body of an embodiment of the present invention;

[0076] Figure 2 is a schematic diagram of a hydraulic control system according to an embodiment of the present invention;

[0077] Figure 3 It is a principle diagram of an air pressure control system for intermittent air supply according to an embodiment of the present invention;

[0078] Figure 4 This is a schematic diagram of an air pressure control system for continuous air supply according to an embodiment of the present invention;

[0079] Figure 5 is an external stereogram of an embodiment of the present invention;

[0080] Figure 6 A longitudinal cross-sectional view of an outer cylinder body and a locking assembly according to an embodiment of the present invention;

[0081] Figure 7 is a cross-sectional view of an embodiment of the present invention;

[0082] Figure 8 This is a stereoscopic diagram of the assembly of the barrel rod and the inner piston of an embodiment of the present invention;

[0083] Fig. 9 is a three-dimensional diagram of an annular locking gear according to an embodiment of the present invention;

[0084] Fig.10 A three-dimensional diagram of an inner cylinder body according to an embodiment of the present invention;

[0085] Among them, 101, the first liquid pipe; 102, the second liquid pipe; 103, the third liquid pipe; 104, the fourth liquid pipe; 105, the fifth liquid pipe; 106, the sixth liquid pipe; 107, the seventh liquid pipe; 108, the eighth liquid pipe; 109, the ninth liquid pipe; 110, the tenth liquid pipe; 201, the first air pipe; 202, the second air pipe; 203, the third air pipe; 204, the fourth air pipe; 205, the fifth air pipe; 206, the sixth air pipe; 207, the seventh air pipe; 208, the eighth air pipe; 209, the ninth air pipe; 210, the tenth air pipe; 211, the eleventh air pipe; 212, the twelfth air pipe; 213, the thirteenth air pipe; 214, the fourteenth air pipe; 215, the fifteenth air pipe; 216, the sixteenth air pipe; 217, the tenth 7th trachea; 218, 18th trachea; 219, 19th trachea; 220, 20th trachea; 222, 22nd trachea; 223, 23rd trachea; 224, 24th trachea; 225, 25th trachea; 226, 26th trachea; 227, 27th trachea; 228, 28th trachea; 229, 29th trachea; 230, 30th trachea; 231, 31st trachea; 232, 32nd trachea; 233, 33rd trachea; 234, 34th trachea; 235, 35th trachea; 236, 36th trachea; 237, 37th trachea; 238, 38th trachea; 239, 39th trachea; 240, 40th trachea; 241, 41st trachea 242, the 42nd air pipe; 243, the 43rd air pipe; 244, the 44th air pipe; 245, the 45th air pipe; 246, the 46th air pipe; 247, the 47th air pipe; 248, the 48th air pipe; 249, the 49th air pipe; 250, the connecting pipe; 301, the slide cylinder; 302, the sliding piston; 303, the second detection hole; 304, the first detection hole; 305, the indicator plate; 306, the slide rod; 307, the bypass groove; 308, the spring card bead; 309, the annular card groove; 310, the light sensor; 311, the indicator light; 312, the detection switch; 313, the power supply; 321, the first hydraulic cylinder; 323, the outer cylinder body; 324, the inner cylinder body; 325, the inner piston; 326, the preload spring spring; 327, cylinder rod; 328, core rod; 329, swing head; 330, swing hole; 331, front section; 332, rear section; 333, rear piston; 334, front piston; 335, keyway; 336, key; 337, locking cylinder; 338, locking pin; 339, hydraulic piston; 340, hydraulic chamber; 341, pneumatic piston; 342, pneumatic chamber; 343, annular locking gear; 344, latching teeth; 345, locking external thread; 346, locking internal thread; 347, external teeth; 348, deep latching groove; 349, shallow latching groove; 350, handle bar; 351, first return spring; 352, second return spring; 353, third return spring; 354, fourth return spring; 355, fifth return spring;356, sixth return spring; 357, seventh return spring; 358, eighth return spring; 359, ninth return spring; 361, first control end; 362, second control end; 363, third control end; 364, fourth control end; 365, fifth control end; 366, sixth control end; 367, seventh control end; 368, eighth control end; 369, ninth control end; 370, tenth control end; 371, eleventh control end; 372, twelfth control end; 373, thirteenth control end; 374, fourteenth control end; 375, fifteenth control end; 376, sixteenth control end; 377, seventeenth control end; 3 78, the eighteenth control terminal; 379, the nineteenth control terminal; 401, the first air inlet; 402, the second air exchange hole; 403, the second air exhaust hole; 404, the third air inlet; 405, the third air exchange hole; 406, the second air inlet; 407, the first air exchange hole; 408, the air vent; 409, the second liquid inlet; 410, the first liquid inlet; 411, the first air exhaust hole; 412, the third air exhaust hole; 413, the fourth air exhaust hole; 511, the first gas path on-off valve; 512, the second gas path on-off valve; 513, the third gas path on-off valve; 514, the fourth gas path on-off valve; 515, the fifth gas path on-off valve; 516, the sixth gas path on-off valve; 52 1. Two-position three-way reversing valve of the first gas circuit; 522. Two-position three-way reversing valve of the second gas circuit; 523. Two-position three-way reversing valve of the third gas circuit; 524. Two-position three-way reversing valve of the fourth gas circuit; 525. Two-position three-way reversing valve of the fifth gas circuit; 526. Two-position three-way reversing valve of the sixth gas circuit; 527. Two-position three-way reversing valve of the seventh gas circuit; 528. Two-position three-way reversing valve of the eighth gas circuit; 529. Two-position three-way reversing valve of the ninth gas circuit; 531. On-off valve of the first liquid circuit; 532. On-off valve of the second liquid circuit; 533. On-off valve of the third liquid circuit; 534. On-off valve of the fourth liquid circuit; 541. Two-position three-way reversing valve of the first gas circuit with delay; 542. Two-position three-way reversing valve of the second gas circuit with delay Valve; 551, first shrink plug; 552, second shrink plug; 553, third shrink plug; 554, fourth shrink plug; 555, fifth shrink plug; 556, sixth shrink plug; 561, oil pump; 562, oil return port; 563, oil outlet; 564, overflow valve; 565, first check valve; 566, first dust filter; 567, first pressure regulating valve; 568, first two-position five-way reversing valve; 570, second check valve, second dust filter; 571, first air cylinder; 572, second air cylinder; 573, two-position four-way reversing valve; 574, second pressure regulating valve; 575, air storage cylinder; 576, two-position three-way reversing valve for liquid circuit; 577, second two-position five-way reversing valve. ; DETAILED DESCRIPTION

[0086] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The embodiments are only used to explain the present invention and do not limit the protection scope of the present invention.

[0087] In each embodiment of this scheme, based on Figure 1 The left side is the front and the right side is the back.

[0088] Note: The following embodiments are described by taking the parking brake of a railway vehicle as an example.

[0089] Example 1

[0090] Inner and outer cylinders, tie rods and locks:

[0091] This embodiment is suitable for using the tensioning device to tighten or loosen various ropes, chains, power lines, pipelines, conveyor belts, mechanical transmission devices, riveting devices, braking devices, etc.

[0092] Note: The “front” of the second thrust member refers to the side of the latch tooth 344 , and the “rear” refers to the side away from the latch tooth 344 .

[0093] The inner cavity of the outer cylinder body 323 is slidably matched with the inner cylinder body 324, and the inner cylinder body 324 and the outer cylinder body 323 are matched with a key 336 and a key groove 335, so that the inner cylinder body 324 can slide axially relative to the outer cylinder body 323 but cannot rotate in a circle; the outer wall of the inner cylinder body 324 is provided with a locking external thread 345.

[0094] The outer cylinder 323 is provided with a first thrust member that axially pushes the inner cylinder 324 to slide;

[0095] The inner cavity of the inner cylinder 324 is slidably matched with an inner piston 325, and the inner piston 325 is connected to the rear end of the pull rod. The front end of the pull rod passes through the front end surfaces of the inner cylinder 324 and the outer cylinder 323 and then extends to the outside of the outer cylinder 323. The pull rod is slidably matched with the inner cylinder 324 and the outer cylinder 323 respectively.

[0096] A preload spring 326 is disposed between the inner piston 325 and the front end of the inner cylinder 324 .

[0097] The inner cylinder body 324 can slide back and forth in the outer cylinder body 323 , and the rear end of the pull rod is connected to the inner piston 325 and then slides relative to the inner cylinder body 324 and the outer cylinder body 323 .

[0098] The pull rod includes a barrel rod 327 and a core rod 328. The core rod 328 is arranged inside the barrel rod 327. A swing gap is left between the core rod 328 and the barrel rod 327. The rear end of the barrel rod 327 is fixed to the inner piston 325. The inner piston 325 is provided with a swing hole 330 connected to the rear end of the barrel rod 327. The rear end of the core rod 328 is penetrated by the swing hole 330. The rear side of the inner piston 325 is provided with a swing head 329 fixed to the rear end of the core rod 328.

[0099] A swing gap is left between the core rod 328 and the barrel rod 327 , so that the core rod 328 and the swing head 329 can swing relative to the inner piston 325 and the barrel rod 327 .

[0100] The front end of the core rod 328 is connected to the driving end of the vehicle mechanical brake device through a chain, a rope or a guide frame with a slot.

[0101] When the outer cylinder body 323 of the tensioning device is fixed, the core rod 328 can automatically adjust the deflection angle in the cylinder rod 327 according to the up, down, left and right positions of the driving end of the vehicle mechanical brake device. Therefore, the position accuracy requirement for the tensioning device relative to the vehicle mechanical brake device is low, which is convenient for on-site installation.

[0102] The installation direction of the tensioning device needs to meet the following requirements: the direction in which the core rod 328 retracts backward is to tighten the vehicle's mechanical brake device, the brake shoe holds the wheel tightly, and the vehicle implements parking braking direction; conversely, it is the parking relief direction.

[0103] When the tensioning device is tightening, the first thrust piece pushes the inner cylinder 324 and the pull rod backward, and the core rod 328 pulls the brake shoe through the vehicle mechanical brake device until the brake shoe abuts against the wheel and cannot move any further. The core rod 328 and the inner piston 325 cannot continue to move backward with the inner cylinder 324. At this time, because the thrust of the first thrust piece is still greater than the elastic force of the pre-compression spring 326, the first thrust piece continues to push the inner cylinder 324 backward and compress the pre-compression spring 326 until the elastic force generated by the pre-compression spring 326 is equal to (ignoring resistance) the thrust of the first thrust piece, and the inner cylinder 324 stops moving backward. In this process, the pre-compression spring 326 will be further compressed to form a greater elastic force.

[0104] In order to prevent the tensioning force of the core rod 328 on the vehicle mechanical brake device from attenuating over time due to leakage of the working medium of the first thrust piece, a locking assembly is provided between the inner cylinder 324 and the outer cylinder 323. After the first thrust piece pushes the inner cylinder 324 to tighten, the relative position of the inner cylinder 324 and the outer cylinder 323 is fixed by the locking assembly. At this time, the mounting seat forms a supporting force on the front end of the pre-compression spring 326, and the pre-compression spring 326 maintains a continuous thrust on the inner piston 325 and the pull rod, forming a continuous pulling force of the pull rod on the vehicle mechanical brake device.

[0105] Therefore, the tension output by the tensioning device is provided by the first thrust piece before the locking assembly is locked, and is provided by the pre-stressed spring 326 after the inner cylinder 324 and the outer cylinder 323 are locked and the thrust of the first thrust piece is removed. Therefore, when the tensioning device pull rod retracts, the continuous tension output to the outside is the elastic force of the pre-stressed spring 326; when the locking assembly releases the locking of the inner cylinder 324, the first thrust piece pushes the inner cylinder 324 and the pull rod forward, and the compressed pre-stressed spring 326 automatically stretches after losing the reaction force of the vehicle mechanical brake device, and the pull rod extends forward and no longer outputs tension to the outside, and the tension constraint of the tightened vehicle mechanical brake device is naturally released.

[0106] A locking assembly is provided between the inner cylinder body 324 and the outer cylinder body 323;

[0107] The locking assembly includes an annular locking gear 343 and a locking pin 338;

[0108] The outer cylinder body 323 is rotatably equipped with an annular locking gear 343, the inner wall of the annular locking gear 343 is provided with a locking internal thread 346 adapted to the locking external thread 345, the outer wall of the annular locking gear 343 is provided with an external tooth 347, the locking pin 338 is slidably equipped with the outer cylinder body 323, and the sliding direction of the locking pin 338 is directed toward the external tooth 347 or away from the external tooth 347;

[0109] The outer cylinder 323 is provided with a second thrust member for driving the locking pin 338 to slide.

[0110] The second thrust member includes a locking cylinder 337 and a locking pin 338;

[0111] The outer cylinder 323 is fixed with a locking cylinder 337, and a pressure chamber is provided in the locking cylinder 337;

[0112] A pressure piston is slidably fitted in the pressure chamber, the pressure piston is fixed to the rear end of the locking pin 338, the front end of the locking pin 338 passes through the front end of the locking cylinder 337, and the locking pin 338 is slidably fitted to the front end of the locking cylinder 337;

[0113] A pressurizing hole is provided at the front end of the pressure chamber, and the pressurizing hole is connected to the pressure control device. A first return spring 351 is provided between the pressure piston and the locking cylinder 337, and the first return spring 351 pushes the front end of the locking pin 338 toward the outer tooth 347 of the annular locking gear 343.

[0114] When the locking pin 338 enters the tooth groove of the external tooth 347, the annular locking gear 343 cannot rotate, and since the annular locking gear 343 is threadedly matched with the inner cylinder body 324, the inner cylinder body 324 cannot slide axially relative to the outer cylinder body 323, and the inner cylinder body 324 is in a locked state at this time; when the locking pin 338 is separated from the external tooth 347, the annular locking gear 343 can rotate normally, and the inner cylinder body 324 can slide axially relative to the outer cylinder body 323, and the inner cylinder body 324 is in an unlocked state.

[0115] The rear end of the locking cylinder 337 is docked with a hollow protrusion, and the rear end of the protrusion is provided with a crossed deep groove 348 and a shallow groove 349. The rear end of the locking pin 338 extends outward from the hollow protrusion, and the rear end of the locking pin 338 is radially provided with a handle rod 350 adapted to the deep groove 348 or the shallow groove 349.

[0116] When the locking pin 338 is extended and retracted forward and backward, the handle can be driven to slide forward and backward along the deep groove 348. When the handle rod 350 is manually pulled out from the deep groove 348, the first return spring 351 is compressed and rotated into the shallow groove 349, the locking pin 338 is fixed backward in the locking cylinder 337, and the locking pin 338 is separated from the outer teeth 347 of the annular locking gear (343), and the locking between the inner cylinder 324 and the outer cylinder 323 is manually released. In this state, the locking pin 338 will not extend and retract with the change of wind pressure and hydraulic pressure, and the inner cylinder 324 and the outer cylinder 323 are in a manually unlocked state; when the handle rod 350 is manually pulled out from the shallow groove 349 and rotated into the deep groove 348, the locking pin 338 can move forward and backward in the locking cylinder 337 with the change of wind pressure and hydraulic pressure, and the locking and unlocking of the inner cylinder 324 and the outer cylinder 323 are automatically controlled.

[0117] The purpose of setting manual unlocking: when it is necessary to manually release the lock of the inner cylinder body 324, the handle rod 350 can be pulled out and rotated and placed in the shallow groove 349, so as to quickly and conveniently unlock the vehicle, relax the already tightened mechanical brake device, and make the brake shoe leave the wheel without the need to use the more troublesome unlocking method of starting the hydraulic pump to pressurize oil.

[0118] In order to prevent the locking pin 338 from being bent, deformed or even stuck due to the lateral force caused by the rotation of the annular locking gear (343) when the locking pin 338 is inserted into the tooth groove of the outer tooth 347 of the annular locking gear (343), a latching tooth 344 is provided at the front end of the locking pin 338. The latching tooth 344 is sleeved inside the head of the locking pin 338, and the locking pin 338 and the latching tooth 344 are connected together by a through pin. The latching tooth 344 can rotate relative to the locking pin 338, and the outer wall of the latching tooth 344 is slidably matched with the inner wall of the locking cylinder 337. When the latching tooth 344 is subjected to the lateral force generated by the annular locking gear (343) having a tendency to rotate, the latching tooth 344 directly transmits the lateral force to the inner wall of the locking cylinder 337, and does not transmit it to the locking pin 338, so as to ensure that the locking pin 338 will not be bent, deformed or stuck in the locking cylinder 337.

[0119] Example 2

[0120] The tensioning device is provided with a pressure control device, and the pressure control device is a hydraulic control system:

[0121] The hydraulic control system is suitable for manually controlling the tightening or loosening of various ropes, chains, power lines, pipelines, conveyor belts, mechanical transmission devices, riveting devices, braking devices, etc. by using the tensioning device.

[0122] The first thrust member includes a first hydraulic cylinder 321, the first hydraulic cylinder 321 is provided with a first liquid inlet hole 410, the first hydraulic cylinder 321 is fixed relative to the outer cylinder body 323, and the output end of the first hydraulic cylinder 321 is located inside the outer cylinder body 323 and points backward to the front end of the inner cylinder body 324. The first hydraulic cylinder 321 can push the inner cylinder body 324 to slide backward in the outer cylinder body 323.

[0123] The pressure chamber is a hydraulic chamber 340, and the pressure piston is a hydraulic piston 339; the pressurizing hole is a second liquid inlet hole 409, and the second liquid inlet hole 409 is located at the front end of the hydraulic chamber 340. The pressure control device includes an oil pressure piece, and the second liquid inlet hole 409 is connected to the oil pressure piece. By arranging the hydraulic piston 339 and the second liquid inlet hole 409, the manual hydraulic unlocking and locking of the inner cylinder body 324 can be achieved;

[0124] It includes a hydraulic control system, which includes an oil pressure pump 561, a relief valve 564, a two-position three-way reversing valve 576 for a liquid circuit, a first liquid circuit on-off valve 531, a second liquid circuit on-off valve 532, a third liquid circuit on-off valve 533 and a fourth liquid circuit on-off valve 534.

[0125] The oil pressure pump 561, the two-position three-way reversing valve 576, the first liquid circuit on-off valve 531, the second liquid circuit on-off valve 532, the third liquid circuit on-off valve 533 and the fourth liquid circuit on-off valve 534 may be manually, pneumatically, electrically or by other mechanical means;

[0126] The oil return port 562 of the oil pressure pump 561 is connected to one end of the first liquid pipe 101, the other end of the first liquid pipe 101 is connected to one end of the second liquid pipe 102 through the first liquid circuit on-off valve 531, the other end of the second liquid pipe 102 is connected to one end of the third liquid pipe 103 through the second liquid circuit on-off valve 532, and the other end of the third liquid pipe 103 is connected to the first liquid inlet hole 410;

[0127] The oil outlet 563 of the oil pressure pump 561 is connected to one end of the fourth liquid pipe 104;

[0128] One end of the fifth liquid pipe 105 is connected to the other end of the fourth liquid pipe 104 or one end of the sixth liquid pipe 106 through the liquid circuit two-position three-way reversing valve 576;

[0129] The other end of the sixth liquid pipe 106 is connected to one end of the seventh liquid pipe 107 through the fourth liquid path on-off valve 534, and the other end of the seventh liquid pipe 107 is connected to the first liquid pipe 101;

[0130] The other end of the fifth liquid pipe 105 is connected to one end of the eighth liquid pipe 108 through the third liquid path on-off valve 533, and the other end of the eighth liquid pipe 108 is connected to the second liquid inlet hole 409;

[0131] The second liquid pipe 102 and the fifth liquid pipe 105 are connected via a ninth liquid pipe 109, the first liquid pipe 101 and the fourth liquid pipe 104 are connected via a tenth liquid pipe 110, and the tenth liquid pipe 110 is provided with an overflow valve 564;

[0132] The display device includes a slide cylinder 301, a slide rod 306, a sliding piston 302 and an indicator plate 305. The sliding piston 302 is slidably matched in the slide cylinder 301. The side wall of the sliding piston 302 is provided with a spring clamping bead 308. The inner walls of both ends of the slide cylinder 301 are respectively provided with annular clamping grooves 309 for the spring clamping bead 308 to be clamped. One end of the slide rod 306 is fixed to the sliding piston 302, and the other end of the slide rod 306 is slidably extended to the The indicator plate 305 is arranged on the outside of the slide 301, and the end of the slide 301 close to the indicator plate 305 is provided with a first detection hole 304 connected to the slide 301, and the end of the slide 301 away from the indicator plate 305 is provided with a second detection hole 303 connected to the slide 301; the first detection hole 304 is connected to the sixth liquid pipe 106, and the second detection hole 303 is connected to the third liquid pipe 103.

[0133] The indicator plate 305 of the display device of this solution is arranged toward the outside of the vehicle, and the indicator plate 305 can be extended or retracted to facilitate operators to view from a distance.

[0134] In order to reduce the number of external hydraulic pipeline connections, the first hydraulic cylinder 321, the locking cylinder 337 and the slide cylinder 301 can be independently provided with a pressure oil pump 561, or the pressure oil pump 561 can be arbitrarily combined to drive the movement of the first hydraulic cylinder 321, the hydraulic piston 339 in the locking cylinder 337 and the sliding piston 302 in the slide cylinder 301;

[0135] Here’s how it works:

[0136] Manual retraction process:

[0137] The initial position of each on-off valve is in a closed state;

[0138] 1. Unlock: connect the fourth liquid pipe 104 and the fifth liquid pipe 105 through the two-position three-way reversing valve 576 of the liquid circuit, connect the third liquid circuit on-off valve 533, start the oil pressure pump 561 to pressurize the oil, and the hydraulic oil flows to: the oil outlet 563, the fourth liquid pipe 104, the two-position three-way reversing valve 576 of the liquid circuit, the fifth liquid pipe 105, the third liquid circuit on-off valve 533, the eighth liquid pipe 108, the second liquid inlet hole 409, and the locking cylinder 337 (push the locking pin 338 to slide backward, and the position of the inner cylinder body 324 relative to the outer cylinder body 323 is unlocked);

[0139] Close the third liquid circuit on-off valve 533;

[0140] 2. Implement retraction: connect the second liquid circuit on-off valve 532 and the fourth liquid circuit on-off valve 534, start the oil pressure pump 561 to pressurize the oil, and the hydraulic oil flows to: the oil outlet 563, the fourth liquid pipe 104, the liquid circuit two-position three-way reversing valve 576, the fifth liquid pipe 105, the ninth liquid pipe 109, the second liquid pipe 102, the second liquid circuit on-off valve 532, and the third liquid pipe 103;

[0141] 2.1 The first liquid inlet hole 410 and the first hydraulic cylinder 321 (pushing the inner cylinder body 324 to slide toward the rear end of the outer cylinder body 323 to achieve braking);

[0142] 2.2 The second detection hole 303 (pushes the sliding piston 302 of the slide cylinder 301, driving the slide rod 306 and the indicator plate 305 to extend, and the pressure-free oil in the front of the slide cylinder 301 flows back to the oil storage tank from the first detection hole 304, the sixth liquid pipe 106, the fourth liquid circuit on-off valve 534, the seventh liquid pipe 107, the first liquid pipe 101, and the oil return port 562. To eliminate the back pressure of the sliding piston 302 moving forward);

[0143] Close the second liquid circuit on-off valve 532 and the fourth liquid circuit on-off valve 534;

[0144] 3. Locking: The first liquid circuit on-off valve 531 and the third liquid circuit on-off valve 533 are connected, and the hydraulic oil in the locking cylinder 337 flows back to the oil storage tank. The specific connecting path is: the hydraulic chamber 340 of the locking cylinder 337, the eighth liquid pipe 108, the third liquid circuit on-off valve 533, the fifth liquid pipe 105, the ninth liquid pipe 109, the second liquid pipe 102, the first liquid circuit on-off valve 531, the first liquid pipe 101, and the oil return port 562. There is no hydraulic pressure in the entire reflux path, the hydraulic thrust of the hydraulic chamber 340 of the locking cylinder 337 disappears, and the elastic force of the first return spring 351 pushes the locking pin 338 to move forward, and the relative position of the inner cylinder 324 and the outer cylinder 323 is locked;

[0145] 4. Pressure relief: Open the second fluid circuit on-off valve 532 to allow the hydraulic oil in the first hydraulic cylinder 321 to flow back to the oil storage tank. Specific communication paths: first hydraulic cylinder 321, first fluid inlet hole 410, third fluid pipe 103, second fluid circuit on-off valve 532, second fluid pipe 102, first fluid circuit on-off valve 531, first fluid pipe 101, oil return port 562, oil storage tank; The hydraulic oil behind the sliding piston 302 of the slide cylinder 301 flows back to the oil storage tank: second detection hole 303, third fluid pipe 103, second fluid circuit on-off valve 532, second fluid pipe 102, first fluid circuit on-off valve 531, first fluid pipe 101, oil return port 562, oil storage tank;

[0146] Close the first liquid circuit on-off valve 531, the second liquid circuit on-off valve 532 and the third liquid circuit on-off valve 533;

[0147] Manual extension process:

[0148] The initial position of each on-off valve is in a closed state;

[0149] 1. Unlock and release: connect the third liquid circuit on-off valve 533, control the two-position three-way reversing valve 576 of the liquid circuit to connect the fourth liquid pipe 104 and the fifth liquid pipe 105; start the oil pressure pump 561 to pressurize the oil, and the hydraulic oil flows to: the oil outlet 563, the fourth liquid pipe 104, the two-position three-way reversing valve 576 of the liquid circuit, the fifth liquid pipe 105, the third liquid circuit on-off valve 533, the eighth liquid pipe 108, the second liquid inlet hole 409, and the locking cylinder 337 (pushing the locking pin 338 to slide backward, the position of the inner cylinder body 324 relative to the outer cylinder body 323 is unlocked, the pre-stressing spring 326 pushes the inner cylinder body 324 forward with the inner piston 325 as support, the pre-stressing spring 326 stretches, and the thrust of the pre-stressing spring 326 on the inner piston 325 and the pull rod gradually disappears. Under the reaction tension of the vehicle mechanical brake device, the inner cylinder body 324 and the pull rod move forward, and the tensioning device pull rod extends);

[0150] Close the third liquid path on-off valve 533.

[0151] 2. Retract the indicator plate 305: connect the second liquid circuit on-off valve 532 and the first liquid circuit on-off valve 531, control the liquid circuit two-position three-way reversing valve 576 to connect the sixth liquid pipe 106 and the fourth liquid pipe 104; start the oil pressure pump 561 to pressurize the oil, and the hydraulic oil flows to: the oil outlet 563, the fourth liquid pipe 104, the liquid circuit two-position three-way reversing valve 576, the sixth liquid pipe 106, the first detection hole 304 (pushing the sliding piston 302 to slide to the rear end until the piston is stuck in the rear groove of the slide cylinder 301, and the piston rod drives the indicator plate 305 to retract); the pressureless oil at the rear of the slide cylinder 301 passes through the second detection hole 303, the third liquid pipe 103, the second liquid circuit on-off valve 532, the second liquid pipe 102, the first liquid circuit on-off valve 531, the first liquid pipe 101, the oil return port 562, and the oil storage tank;

[0152] Close the second liquid circuit on-off valve 532 and the first liquid circuit on-off valve 531;

[0153] When the outlet pressure of the oil pump 561 is higher than the set pressure of the relief valve 564, the ultra-high hydraulic oil automatically flows back to the oil storage tank. The hydraulic oil flows from: oil outlet 563, fourth liquid pipe 104, relief valve 564, tenth liquid pipe 110, first liquid pipe 101, oil return port 562, oil storage tank.

[0154] Example 3

[0155] The gas pressure structure of the first thrust piece and the second thrust piece:

[0156] This embodiment is improved on the basis of embodiment 1, and is suitable for using the tensioning device to tighten or loosen various ropes, chains, power lines, pipelines, conveyor belts, mechanical transmission devices, riveting devices, braking devices, etc.

[0157] Note: The “front” of the air pressure chamber 342 refers to the side close to the latch tooth 344 , and the “rear” refers to the side away from the latch tooth 344 .

[0158] The air pressure structure of the first thrust member includes a first air inlet hole 401 and a third air inlet hole 404 .

[0159] The first air inlet hole 401 is disposed at the front end of the outer cylinder body 323 , and the third air inlet hole 404 is disposed at the rear end of the outer cylinder body 323 .

[0160] That is, pressurized air is supplied to the front chamber of the outer cylinder body 323 through the first air inlet hole 401, so as to push the inner cylinder body 324 toward the rear end of the outer cylinder body 323. After the pressurized air in the front cylinder body of the outer cylinder body 323 is discharged, pressurized air is supplied to the rear chamber of the outer cylinder body 323 through the third air inlet hole 404, and the inner cylinder body 324 moves toward the front section 331 of the outer cylinder body 323.

[0161] The outer cylinder 323 includes a front section 331 and a rear section 332. The front outer wall of the inner cylinder 324 is provided with a front piston 334 that slides with the inner wall of the front section 331. The rear outer wall of the inner cylinder 324 is provided with a rear piston 333 that slides with the inner wall of the rear section 332.

[0162] In this embodiment, the front section 331 has a larger diameter than the rear section 332, so that when the first thrust member uses compressed air to push the inner cylinder 324 backward, it can generate a larger thrust to compress the first pre-compression spring 326, so as to provide a larger pressing force for the vehicle brake shoe to the wheel, so as to generate sufficient parking braking force. The rear section 332 of the outer cylinder 323 is intended to generate an appropriate forward thrust, so that the inner cylinder 324 moves forward to the extreme position and no longer pulls the driving end of the vehicle mechanical brake device. Therefore, the rear section 332 of the outer cylinder 323 has a small diameter.

[0163] A second ventilation hole 402 is provided in the middle of the front section 331;

[0164] When the inner cylinder 324 slides to the front extreme position, the second air exchange hole 402 is separated from the first air inlet hole 401;

[0165] When the inner cylinder 324 slides to the rear limit position, the second air exchange hole 402 is connected with the first air inlet hole 401;

[0166] When the inner cylinder 324 slides between the front extreme position and the rear extreme position, either the second air exchange hole 402 is separated from the first air inlet hole 401; or the second air exchange hole 402 is connected to the first air inlet hole 401;

[0167] The air pressure structure of the second thrust member includes an air pressure chamber 342 , a second air inlet hole 406 , a first air exchange hole 407 and an air vent 408 .

[0168] The pressure piston is a pneumatic piston 341; the pressurizing hole is a second air inlet hole 406, the second air inlet hole 406 is located at the front end of the pneumatic chamber 342, the rear end of the pneumatic chamber 342 is provided with a vent hole 408, and the middle part of the pneumatic chamber 342 is provided with a first air exchange hole 407; when the pneumatic piston 341 is located at the rear end of the pneumatic chamber 342, the first air exchange hole 407 is connected to the second air inlet hole 406 through the locking cylinder 337, and the first air exchange hole 407 is disconnected from the air vent hole 408; when the pneumatic piston 341 is located at the front end of the pneumatic chamber 342, the first air exchange hole 407 is connected to the air vent hole 408 through the locking cylinder 337, and the first air exchange hole 407 is disconnected from the second air inlet hole 406. If the latching tooth 344 is misaligned with the tooth groove of the outer tooth 347 of the annular locking gear 343, so that the latching tooth 344 cannot enter the tooth groove of the outer tooth 347, the position of the pneumatic piston 341 blocks the first ventilation hole 407, so that the first ventilation hole 407 is isolated from the ventilation hole 408 and the second air inlet hole 406.

[0169] Example 4

[0170] The tensioning device is provided with a pressure control device, and the pressure control device is an air pressure control system for intermittent air supply:

[0171] This embodiment is an improvement on the third embodiment, and is suitable for automatically controlling the parking brake or parking release of the mechanical brake device of a stopped railway vehicle by using the tensioning device.

[0172] In this embodiment, the rear end of the front section 331 is provided with a second exhaust hole 403, and the front part of the rear section 332 is provided with a third air exchange hole 405. When the inner cylinder body 324 slides to the front extreme position, the third air exchange hole 405 is connected with the third air inlet hole 404, the third air exchange hole 405 is separated from the second exhaust hole 403, and the second air exchange hole 402 is connected with the second exhaust hole 403; when the inner cylinder body slides to the rear extreme position, the third air exchange hole 405 is separated from the third air inlet hole 404, the third air exchange hole 405 is connected with the second exhaust hole 403, and the second air exchange hole 402 is separated from the second exhaust hole 403;

[0173] The first air inlet 401 is connected to one end of the first air pipe 201, and the other end of the first air pipe 201 is connected to the atmosphere through the first air circuit on-off valve 511. The air hole of the first air circuit on-off valve 511 connected to the atmosphere is provided with a fourth shrink plug 554. One end of the first air circuit on-off valve 511 is provided with a first control end 361, and the other end of the first air circuit on-off valve 511 is provided with a second control end 362 and a second return spring 352. The first air pipe 201 is connected to the first control end 361, and the second control end 362 is connected to the first end of the second air pipe 202. Only when there is pressurized air at the first control end 361, the first air circuit on-off valve 511 connects the first air pipe 201 to the atmosphere. In other cases, the first air circuit on-off valve 511 disconnects the first air pipe 201 from the atmosphere.

[0174] The other end of the second air pipe 202 is connected to the atmosphere or one end of the third air pipe 203 through the first air circuit two-position three-way reversing valve 521. The first air circuit two-position three-way reversing valve 521 is provided with a third control end 363 and a third return spring 353. The third control end 363 is connected to one end of the twelfth air pipe 212. When there is pressurized air at the third control end 363, the third control end 363 pushes the valve core to connect the second air pipe 202 with the atmosphere. When there is no pressurized air at the third control end 363, the third return spring 353 pushes the valve core to connect the second air pipe 202 with the third air pipe 203. The air pipe 202 is isolated from the atmosphere; the other end of the third air pipe 203 is connected to one end of the fourth air pipe 204 or one end of the fifth air pipe 205 through the second air circuit two-position three-way reversing valve 522, and the second air circuit two-position three-way reversing valve 522 is provided with a fourth control end 364 and a fifth control end 365, the fourth control end 364 is connected to one end of the fourth air pipe 204, the fifth control end 365 is connected to one end of the fifth air pipe 205, and the fourth control end 364 and the fifth control end 365 have pressurized air, and the air pipe connected to the control end is connected to the other end of the third air pipe 203;

[0175] The other end of the fourth air pipe 204 is connected to the atmosphere or one end of the sixth air pipe 206 through the first air circuit delayed two-position three-way reversing valve 541. The first air circuit delayed two-position three-way reversing valve 541 is provided with a sixth control end 366 and a fourth reset spring 354. The sixth control end 366 is connected to one end of the sixth air pipe 206 through the first shrink plug 551. In the initial state, there is no air pressure at the sixth control end 366. Under the reset force of the fourth reset spring 354, the first air circuit delayed two-position three-way reversing valve 541 connects the fourth air pipe 204 with the sixth air pipe 206, and the fourth air pipe 204 is disconnected from the atmosphere. As the pressurized air of the sixth air pipe 206 passes through the shrink plug 551 and continuously charges and pressurizes the sixth control end 366, the air pressure of the sixth control end 366 gradually increases. After a period of time, when the thrust of the pressurized air of the sixth control end 366 is greater than the reset force of the fourth reset spring 354, the first air path delays the two-position three-way reversing valve 541 to disconnect the fourth air pipe 204 from the sixth air pipe 206, and the fourth air pipe 204 is connected to the atmosphere.

[0176] The other end of the sixth air pipe 206 is connected to the atmosphere or one end of the seventh air pipe 207 through the third air circuit two-position three-way reversing valve 523, and the other end of the seventh air pipe 207 is connected to the first air cylinder 571. The seventh air pipe is provided with a first pressure regulating valve 567 and a third air circuit on-off valve 513;

[0177] The first air cylinder 571 is connected to one end of the eighth air pipe 208, and the other end of the eighth air pipe 208 is connected to the train pipe through the second air path on-off valve 512. The eighth air pipe 208 is provided with a first check valve 565 that only allows gas to flow to the first air cylinder 571, and the eighth air pipe 208 is provided with a first dust filter 566;

[0178] The other end of the fifth air pipe 205 is connected to the atmosphere or one end of the ninth air pipe 209 through the second air circuit delayed two-position three-way reversing valve 542. The second air circuit delayed two-position three-way reversing valve 542 is provided with a seventh control end 367 and a fifth return spring 355. The seventh control end 367 is connected to one end of the ninth air pipe 209 through the second shrink plug 552. In the initial state, there is no air pressure at the seventh control end 367. Under the action of the return force of the fifth return spring 355, the second air circuit delayed two-position three-way reversing valve 542 connects the fifth air pipe 205 with the ninth air pipe 209, and the fifth air pipe 205 is disconnected from the atmosphere. As the pressurized air of the ninth air pipe 209 continuously charges and pressurizes the seventh control end 367 through the shrink plug 552, the air pressure of the seventh control end 367 gradually increases. After a period of time, when the thrust of the pressurized air of the seventh control end 367 is greater than the reset force of the fifth reset spring 355, the second air circuit delay two-position three-way reversing valve 542 disconnects the fifth air pipe 205 from the ninth air pipe 209, and the fifth air pipe 205 is connected to the atmosphere.

[0179] The other end of the ninth air pipe 209 is connected to one end of the tenth air pipe 210 or the atmosphere through the fourth air circuit two-position three-way reversing valve 524, and the other end of the tenth air pipe 210 is connected to the eighth air pipe 208. The third air circuit two-position three-way reversing valve 523 and the fourth air circuit two-position three-way reversing valve 524 share the eighth control end 368 and the sixth return spring 356. The eighth control end 368 is connected to the eighth air pipe 208 through the eleventh air pipe 211, and the eighth control end 368 is connected to the brake cylinder through the connecting pipe 250. The connecting pipe 250 and the eleventh air pipe 211 independently control the eighth control end 368. The first check valve 565 is located between the tenth air pipe 210 and the eleventh air pipe 211. When the thrust of the eighth control end 368 is greater than the reset force of the sixth reset spring 356, the eighth control end 368 pushes the valve core to disconnect the sixth air pipe 206 and the seventh air pipe 207, the sixth air pipe 206 is connected to the atmosphere, the ninth air pipe 209 is connected to the tenth air pipe 210, and the ninth air pipe 209 is disconnected from the atmosphere; when the thrust of the eighth control end 368 is less than the reset force of the sixth reset spring 356, the sixth reset spring 356 pushes the valve core to connect the sixth air pipe 206 and the seventh air pipe 207, the sixth air pipe 206 is disconnected from the atmosphere, the ninth air pipe 209 is disconnected from the tenth air pipe 210, and the ninth air pipe 209 is connected to the atmosphere;

[0180] The other end of the twelfth air pipe 212 is connected to one end of the thirteenth air pipe 213 or one end of the fourteenth air pipe 214 through the fifth air circuit two-position three-way reversing valve 525. The fifth air circuit two-position three-way reversing valve 525 is provided with a ninth control end 369 and a tenth control end 370. The ninth control end 369 is connected to one end of the thirteenth air pipe 213. The other end of the thirteenth air pipe 213 is connected to the second air exchange hole 402. The tenth control end 370 is connected to one end of the fourteenth air pipe 214. The other end of the fourteenth air pipe is connected to the third air exchange hole 405. The ninth control end 369 and the tenth control end 370 have pressurized air. The air pipe connected to the control end is connected to the other end of the twelfth air pipe 212. The twelfth air pipe 212 is provided with a third shrink plug 553.

[0181] The first ventilation hole 407 is connected to one end of the fifteenth air pipe 215, and the other end of the fifteenth air pipe 215 and the two ventilation holes are connected to one end of the sixteenth air pipe 216 or one end of the seventeenth air pipe 217 through the first two-position five-way reversing valve 568. The other end of the sixteenth air pipe 216 is connected to the first air pipe 201, and the other end of the seventeenth air pipe 217 is connected to the third air inlet hole 404. The first two-position five-way reversing valve 568 is provided with an eleventh control end 371 and a twelfth control end 372. 72, the eleventh control end 371 is connected to the fifth air pipe 205 through the eighteenth air pipe 218, the twelfth control end 372 is connected to the fourth air pipe 204 through the nineteenth air pipe 219, when the eleventh control end 371 has pressurized air, the sixteenth air pipe 216 is connected to the atmosphere, the seventeenth air pipe 217 is connected to the fifteenth air pipe 215, when the twelfth control end 372 has pressurized air, the sixteenth air pipe 216 is connected to the fifteenth air pipe 215, and the seventeenth air pipe is connected to the atmosphere. The second air inlet 406 is connected to the second air pipe 202 through the twentieth air pipe 220.

[0182] The vent hole 408 is connected to one end of the thirty-ninth air pipe 239, and the other end of the thirty-ninth air pipe 239, the first exhaust hole 411, and the third exhaust hole 412 are connected to one end of the fortieth air pipe 240 or one end of the forty-first air pipe 241 through the second two-position five-way reversing valve 577; the second two-position five-way reversing valve 577 is provided with a sixteenth control end 376 and a seventeenth control end 377, the sixteenth control end 376 is connected to the fourteenth air pipe 214 through the forty-second air pipe 242, and the seventeenth control end 377 is connected to the forty-third air pipe 243 through the forty-third air pipe 244. To the thirteenth air pipe 213; when there is pressurized air at the sixteenth control end 376, the valve core is pushed to move, so that the thirty-ninth air pipe 239 is connected to the forty-first air pipe 241, and the fortieth air pipe 240 is connected to the first exhaust hole 411; when there is pressurized air at the seventeenth control end 377, the valve core is pushed in the reverse direction, so that the thirty-ninth air pipe 239 is connected to the fortieth air pipe 240, and the forty-first air pipe 241 is connected to the third exhaust hole 412; the other end of the fortieth air pipe 240 is connected to the second detection hole 303, and the other end of the forty-first air pipe 241 is connected to the first detection hole 304.

[0183] The display device includes a slide cylinder 301, a slide rod 306, a sliding piston 302 and an indicator plate 305. The sliding piston 302 is slidably matched in the slide cylinder 301. The side wall of the sliding piston 302 is provided with a spring card bead 308. The inner walls of both ends of the slide cylinder 301 are respectively provided with annular card grooves 309 for the spring card bead 308 to be trapped. One end of the slide rod 306 is fixed to the sliding piston 302, and the other end of the slide rod 306 is slidably extended to the outside of the slide cylinder 301. The slide rod 306 outside the slide cylinder 301 is provided with the indicator plate 305. A first detection hole 304 connected to the slide 301 is provided at one end of the cylinder 301 close to the indicator plate 305, and a second detection hole 303 connected to the slide 301 is provided at one end of the slide 301 away from the indicator plate 305; longitudinal bypass grooves 307 for ventilation are respectively provided on the front and rear inner walls of the slide 301, and when the sliding piston 302 slides to the front extreme position, the bypass groove 307 can connect the middle chamber of the slide 301 with the first detection hole 304, and when the sliding piston 302 slides to the rear extreme position, the bypass groove 307 can connect the middle chamber of the slide 301 with the second detection hole 303.

[0184] The indicator plate 305 of the display device of this solution is arranged toward the outside of the vehicle, and the indicator plate 305 can be extended or retracted to facilitate operators to view from a distance.

[0185] The second exhaust hole 403 is provided in this embodiment to remove the residual pressurized air in the pipeline connected to the second ventilation hole 402 and the third ventilation hole 405, so that the third control end 363 of the first air circuit two-position three-way reversing valve 521 and the sixteenth control end 376 and the seventeenth control end 377 of the second two-position five-way reversing valve 577 are always connected to the atmosphere when there is no pressurized air pushing, thereby ensuring the reliable function of the first air circuit two-position three-way reversing valve 521 and the second two-position five-way reversing valve 577.

[0186] The third ventilation hole 405 is provided in this embodiment to confirm that the inner cylinder body 324 moves to the front extreme position before activating the locking device to lock the inner cylinder body 324 .

[0187] The connecting tube 250 contains liquid, one end of the connecting tube 250 is connected to the eighth control end 368, and the other end of the connecting tube 250 is connected to the brake cylinder through an air-to-liquid conversion device.

[0188] The air-to-liquid conversion device can also be connected to the brake cylinder pipe, because the brake cylinder pipe and the brake cylinder are connected to each other, and the air-to-liquid conversion device connected to the brake cylinder pipe is equivalent to being connected to the brake cylinder pipe. Directly introducing the brake cylinder pressure into the eighth control end 368 will cause the brake cylinder pressure to drop, causing the vehicle braking force to drop, so an air-to-liquid conversion device is installed close to the brake cylinder (or brake cylinder pipe) to convert the air pressure of the brake cylinder (or brake cylinder pipe) into hydraulic pressure on the spot, and then transmit the pressure signal to the eighth control end 368 through the connecting pipe 250. If the installation space allows, the eighth control end 368 can also be directly installed on the brake cylinder (or brake cylinder pipe), thereby greatly reducing the length of the connecting pipeline without the need for air-to-liquid conversion.

[0189] The eighth air pipe 208 of this embodiment is provided with a first dust filter 566 to prevent impurities in the train pipe from entering the tensioning device air pressure control system. The seventh air pipe 207 is provided with a first pressure regulating valve 567, which can control the air pressure supplied to the tensioning device by the first air cylinder 571, so as to adjust the parking brake tension output by the tensioning device. The third air circuit on-off valve 513 can cut off the exhaust brake function of the tensioning device when the tensioning device fails, so that it remains in the air-filled parking relief state. The second air circuit on-off valve 512 is used to cut off the tensioning device (if the train pipe is artificially inflated and pressurized, and the tensioning device has completed unlocking the parking relief lock and the second air circuit on-off valve 512 is closed, the tensioning device will not achieve the exhaust parking brake function as the train pipe and brake cylinder are artificially exhausted and depressurized; if the train pipe is artificially inflated and depressurized, and the tensioning device has completed unlocking the parking brake lock and the second air circuit on-off valve 512 is closed, the tensioning device will not achieve the filling parking relief function as the train pipe is artificially inflated and pressurized).

[0190] The first check valve 565 ensures that the pressure air in the eighth air pipe 208 can smoothly enter the first air cylinder 571 when the train pipe is charged and pressurized, and prevents the pressure air in the first air cylinder 571 from flowing back to the train pipe when the train pipe is exhausted and depressurized, thereby interfering with the normal pressure adjustment of the vehicle air brake device. At the same time, it also provides sufficient pressure air power for the vehicle to implement parking brake action.

[0191] It should be noted that the shrink plug used in this embodiment is a commonly used component in the art, and its function is to reduce the air flow rate and make it pass slowly.

[0192] Here’s how it works:

[0193] 1. Charging and parking relief

[0194] 1.1 Air filling

[0195] The air filling of the tensioning device includes two situations:

[0196] The first one is that the train pipe is in an artificial air-filled and pressurized state, and the brake cylinder is in an automatic emptying state (this is an inherent characteristic of the railway vehicle brake). In this state, the pressurized air flows to: the train pipe, the eighth air pipe 208, the eleventh air pipe 211 (that is, the eleventh air pipe 211 has pressure and the connecting pipe 250 has no pressure), and the eighth control end 368.

[0197] The second type is that the train pipe is in a state of artificial exhaust and pressure reduction, and the brake cylinder is in a state of automatic air filling and pressurization (this is an inherent characteristic of the railway vehicle brake). In this state, the pressurized air in the brake cylinder acts on the eighth control end 368 through the connecting pipe 250 (that is, the eleventh air pipe 211 has partial pressure and the connecting pipe 250 has pressure, or the eleventh air pipe 211 has no pressure and the connecting pipe 250 has pressure).

[0198] The purpose of using the eleventh air pipe 211 and the connecting pipe 250 to jointly control the eighth control end 368 is to avoid the situation where the eighth control end 368 loses thrust due to normal artificial exhaust and decompression of the train pipe or normal exhaust and decompression of the brake cylinder when the eleventh air pipe 211 or the connecting pipe 250 is used alone to control the eighth control end 368, and the tensioning device is automatically converted into a parking brake state. The parking brake function of the tensioning device can only be used when the vehicle is stopped, and the parking brake function must not be used during vehicle operation.

[0199] The air filling passage is as follows:

[0200] 1.1.1 Passage of the train pipe during air filling

[0201] 1.1.1.1 Train pipe, second air path on-off valve 512, eighth air pipe 208, first dust filter 566

[0202] 1.1.1.1.1 Eleventh air pipe 211, eighth control terminal 368.

[0203] 1.1.1.1.2 First check valve 565 and first air cylinder 571.

[0204] 1.1.2 Brake cylinder air charging passage

[0205] Brake cylinder, connecting pipe 250 , and eighth control end 368 .

[0206] 1.2 Gas path conversion

[0207] In the above two situations, the eighth control end 368 will generate a thrust that is greater than the reset force of the sixth reset spring 356, compressing the sixth reset spring 356, and pushing the valve cores of the third gas circuit two-position three-way reversing valve 523 and the fourth gas circuit two-position three-way reversing valve 524 to move, that is, the above two situations will produce the same results as follows: the tenth air pipe 210 is connected to the ninth air pipe 209, the ninth air pipe 209 is disconnected from the atmosphere, the seventh air pipe 207 is disconnected from the sixth air pipe 206, and the sixth air pipe 206 is connected to the atmosphere.

[0208] 1.3 Restoration Path

[0209] After the sixth air pipe 206 in 1.2 is connected to the atmosphere, the following passage is formed:

[0210] The sixth control end 366 of the first air circuit delayed two-position three-way reversing valve 541 has pressurized air (before the tensioning device implements the air charging parking relief, the tensioning device is in the exhaust parking brake state, in which the sixth control end 366 of the first air circuit delayed two-position three-way reversing valve 541 is full of pressurized air), the first shrink plug 551, the sixth air pipe 206, the third air circuit two-position three-way reversing valve 523, and the atmosphere. The fourth return spring 354 pushes the valve core to move, causing the first air circuit delayed two-position three-way reversing valve 541 to connect the fourth air pipe 204 and the sixth air pipe 206, and the fourth air pipe 204 is isolated from the atmospheric passage, making air circuit preparation for the subsequent exhaust parking brake.

[0211] 1.4 Unlock

[0212] After the tenth air pipe 210 and the ninth air pipe 209 are connected in 1.2 above, the following passage is formed:

[0213] 1.4.1 Train pipe, eighth air pipe 208, tenth air pipe 210, fourth air circuit two-position three-way reversing valve 524, ninth air pipe 209, second air circuit delayed two-position three-way reversing valve 542 (the existence of second shrink plug 552, at the beginning, the reset force of fifth reset spring 355 is greater than the thrust of pressurized air of seventh control end 367, then ninth air pipe 209 and fifth air pipe 205 are connected), fifth air pipe 205;

[0214] 1.4.1.1 The eighteenth air pipe 218 and the eleventh control end 371 of the first two-position five-way reversing valve 568 (pushing the valve core of the first two-position five-way reversing valve 568 to move, so that the fifteenth air pipe 215 is connected with the seventeenth air pipe 217, the fifteenth air pipe 215 is disconnected from the sixteenth air pipe 216, and the sixteenth air pipe 216 is connected with the atmosphere, so that the front chamber of the outer cylinder body 323 is connected with the atmosphere, eliminating the back pressure of the inner cylinder body 324 moving forward);

[0215] 1.4.1.2 The second gas circuit two-position three-way reversing valve 522 (pushes the valve core to move so that the fifth gas pipe 205 is connected with the third gas pipe 203), the third gas pipe 203, the first gas circuit two-position three-way reversing valve 521 (the third control end 363 of the first gas circuit two-position three-way reversing valve 521 has no pressurized air, the valve core is in the initial state, the third gas pipe 203 is connected with the second gas pipe 202), and the second gas pipe 202;

[0216] 1.4.2.1.1 The second control end 362 of the first air circuit on-off valve 511 (at this time, there is no pressurized air at the first control end 361, and the air pressure at the second control end 362 + the reset force of the second reset spring 352 is greater than the pressure at the first control end 361, so the valve core does not move, so that the first air pipe 201 remains disconnected from the atmosphere);

[0217] 1.4.2.1.2 The twentieth air pipe 220, the second air inlet hole 406, and the locking cylinder 337 (pushing the locking pin 338 backwards to unlock the inner cylinder body 324 relative to the outer cylinder body 323, while connecting the second air inlet hole 406 to the first air exchange hole 407).

[0218] 1.5 Parking relief

[0219] 1.5.1 The air in the front chamber of the outer cylinder 323 passes through the first air inlet 401, the first air pipe 201, the sixteenth air pipe 216, the first two-position five-way reversing valve 568 (the sixteenth air pipe 216 has been connected to the atmosphere in 1.4.1 before), and the atmosphere. The air back pressure of the inner cylinder 324 moving forward is eliminated;

[0220] 1.5.2 The first air exchange hole 407, the fifteenth air pipe 215, the first two-position five-way reversing valve 568 (previously 1.4.1.1 connected the fifteenth air pipe 215 and the seventeenth air pipe 217), the seventeenth air pipe 217, the third air inlet hole 404, and the rear chamber of the outer cylinder 323 (pushing the inner cylinder 324 to slide forward to the extreme position). The parking relief of the tensioning device is realized.

[0221] 1.6 Locking

[0222] Prior to 1.5.2, the inner cylinder 324 is moved to the front extreme position, so that the rear chamber of the outer cylinder 323 is connected with the third ventilation hole 405, forming the following passage:

[0223] 1.6.1 The third ventilation hole 405 and the fourteenth air pipe 214;

[0224] 1.6.1.1 The tenth control end 370 of the fifth gas circuit two-position three-way reversing valve 525 (pushing the valve core so that the fourteenth gas pipe 214 is connected to the twelfth gas pipe 212), the twelfth gas pipe 212, and the third control end 363 of the first gas circuit two-position three-way reversing valve 521 (due to the existence of the third shrink plug 553, the pressure of the third control end 363 of the first gas circuit two-position three-way reversing valve 521 gradually increases, slowly pushing the valve core of the first gas circuit two-position three-way reversing valve 521 to move and compress the third return spring 353, so that the third gas pipe 203 is delayed from being disconnected from the second gas pipe 202, and the second gas pipe 202 is delayed from being connected to the atmosphere. It is intended to provide a sufficient time period, and after the inner cylinder body 324 is completely moved to the front extreme, the action of finally starting to lock the relative position of the inner cylinder body 324 and the outer cylinder body 323 is finally started);

[0225] 1.6.1.2 The pressure chamber of the locking cylinder 337, the second air inlet hole 406, the twentieth air pipe 220, the second air pipe 202, the first air circuit two-position three-way reversing valve 521 (previously, the valve core of the first air circuit two-position three-way reversing valve 521 in 1.6.1.1 was pushed by the pressure air of the twelfth air pipe 212, so that the second air pipe 202 was connected to the atmosphere), and the atmosphere. The pressurized air in the locking cylinder 337 is discharged to the atmosphere, and the locking pin 338 slides forward under the push of the first return spring 351, so that the latching tooth 344 enters the tooth groove of the outer tooth 347 of the annular locking gear 343, disconnecting the passage from the second air inlet hole 406 to the first air exchange hole 407, and connecting the passage from the first air exchange hole 407 to the air vent hole 408, while locking the relative position of the inner cylinder body 324 and the outer cylinder body 323. It is intended to fix the parking relief state);

[0226] 1.7 Indicator plate 305 retracts

[0227] 1.7.1 Previously, the pressurized air of the 14th air pipe 214 in 1.6.1 enters the 42nd air pipe 242 and the 16th control end 376 of the second 2-position 5-way reversing valve 577. The valve core of the second 2-position 5-way reversing valve 577 moves, so that the 39th air pipe 239 is connected to the 41st air pipe 241, and the 40th air pipe 240 is connected to the first exhaust hole 411.

[0228] As the locking pin 338 in 1.6.1.2 moves to the front end, the passage from the second air inlet 406 to the first air exchange hole 407 is disconnected, and the passage from the first air exchange hole 407 to the air vent 408 is connected;

[0229] 1.7.2 The third control end 363 of the first gas circuit two-position three-way reversing valve 521 (previously, the pressure air of the twelfth gas pipe 212 in 1.6.1.1 pushed the valve core of the first gas circuit two-position three-way reversing valve 521 to move, and the second gas pipe 202 was disconnected from the third gas pipe 203, and the second gas pipe 202 was connected to the atmosphere), the twelfth gas pipe 212 (the third shrink plug 553 exists, and the gas slowly flows back), the fifth gas circuit two-position three-way reversing valve 525 (previously, the twelfth gas pipe 212 and the fourteenth gas pipe 214 were still in a connected state in 1.6.1.1), the fourteenth gas pipe 214, the third ventilation hole 405, the rear chamber of the outer cylinder body 323, the third air inlet hole 404, the seventeenth air pipe 217, the first two-position five-way reversing valve 568 (previously, the seventeenth air pipe 217 and the fifteenth air pipe 215 were connected in 1.4.1.1), the fifteenth air pipe 215, the first ventilation hole 407, the locking cylinder 337, the ventilation hole 408, the thirty-ninth air pipe 239, the second two-position five-way reversing valve 577 (previously, the thirty-ninth air pipe 239 was already connected with the forty-first air pipe 241 in 1.7.1), the forty-first air pipe 241, and the first detection hole 304.

[0230] 1.7.2.1 The air at the rear of the slide cylinder 301 passes through the second detection hole 303, the 40th air pipe 240, the second two-position five-way reversing valve 577 (previously 1.7.1 the 40th air pipe 240 has been connected to the first exhaust hole 411), the first exhaust hole 411, and the atmosphere, eliminating the air back pressure generated when the sliding piston 302 retracts.

[0231] 1.7.2.2 The first detection hole 304 (pushes the sliding piston 302 in the slide cylinder 301, drives the slide rod 306 and the indicator plate 305 to retract to the rear extreme position, so that the spring card bead 308 is locked into the annular groove 309), the middle chamber of the slide cylinder 301, the bypass groove 307, the second detection hole 303, the 40th air pipe 240, the second two-position five-way reversing valve 577 (the 40th air pipe 240 has been connected to the first exhaust hole 411 in 1.7.1), the first exhaust hole 411, and the atmosphere.

[0232] 1.8 Restoration Path

[0233] Since the pressurized air of the third control end 363 of the first gas circuit two-position three-way reversing valve 521 in 1.7.2 and 1.7.2.2 is discharged to the atmosphere, the third return spring 353 of the first gas circuit two-position three-way reversing valve 521 pushes the valve core to reset, so that the second gas pipe 202 and the third gas pipe 203 are connected again, and the second gas pipe 202 is cut off from the atmosphere, so as to prepare the passage for the exhaust parking brake of the tensioning device in the next step.

[0234] 1.9 Cut off the gas supply

[0235] When the train pipe is artificially inflated and pressurized, the tenth air pipe 210, the fourth air circuit two-position three-way reversing valve 524, the ninth air pipe 209, and the seventh control end 367 of the second air circuit delayed two-position three-way reversing valve 542 (the existence of the second shrink plug 552, the thrust of the pressurized air gradually exceeds the reset force of the fifth return spring 355, the pressurized air gradually pushes the valve core to move and compress the fifth return spring 355, so that the fifth air pipe 205 and the ninth air pipe 209 are disconnected, and the fifth air pipe 205 is connected to the atmosphere, so that the air supply of the tenth air pipe 210 continues for a period of time, and after the tensioning device is inflated, parked, relieved and locked, the air supply is disconnected by the second air circuit delayed two-position three-way reversing valve 542, so as to prevent the tenth air pipe 210 from continuously supplying air to the air pressure control system passage, and the leakage that may exist in each sealing part, causing the train pipe pressure to drop abnormally, thereby interfering with the normal artificial air charging and pressurization, pressure maintenance and artificial exhaust and decompression of the vehicle's air brake device);

[0236] 1.10 Remove the pressurized air in the reversing valve

[0237] 1.10.1 The eleventh control end 371 of the first two-position five-way reversing valve 568, the eighteenth air pipe 218, the fifth air pipe 205, the second air circuit delayed two-position three-way reversing valve 542 (previously, 1.9 the fifth air pipe 205 is connected to the atmosphere), and the atmosphere. The pressurized air is discharged to the atmosphere, and the eleventh control end 371 of the first two-position five-way reversing valve 568 loses the thrust of the pressurized air, preparing for the next reversal);

[0238] 1.10.2 The third air pipe 203, the fifth control end 365 of the second air circuit two-position three-way reversing valve 522, the fifth air pipe 205, the second air circuit delayed two-position three-way reversing valve 542 (previously 1.9 the fifth air pipe 205 is connected to the atmosphere), and the atmosphere. The fifth control end 365 of the second air circuit two-position three-way reversing valve 522 loses the thrust of the pressurized air and is ready for the next reversal;

[0239] 2 Exhaust parking brake

[0240] 2.1 Exhaust

[0241] The pressure air in the train pipe is artificially discharged, and the pressure air in the brake cylinder is naturally leaked or artificially discharged, resulting in no air pressure in the train pipe and insufficient air pressure in the brake cylinder.

[0242] The exhaust passage is as follows:

[0243] 2.1.1 Train pipe exhaust passage

[0244] The eighth control terminal 368, the eleventh air pipe 211, the first dust filter 566, the eighth air pipe 208, the second air path on-off valve 512, and the train pipe.

[0245] 2.1.2 Brake cylinder exhaust passage

[0246] The eighth control terminal 368, the connecting pipe 250, and the brake cylinder.

[0247] 2.2 Gas path conversion

[0248] Because there is no air pressure in the train pipe and the air pressure in the brake cylinder is insufficient, the eleventh air pipe 211 has no pressure, the connecting pipe 250 has insufficient pressure, and there is no air pressure in the train pipe acting on the eighth control end 368. The brake cylinder connecting pipe 250 has insufficient thrust on the eighth control end 368, and the reset force of the sixth return spring 356 is greater than the thrust of the eighth control end 368, causing the sixth return spring 356 to gradually push the valve core to move, disconnecting the tenth air pipe 210 and the ninth air pipe 209, connecting the ninth air pipe 209 to the atmosphere, connecting the seventh air pipe 207 to the sixth air pipe 206, and disconnecting the sixth air pipe 206 from the atmosphere.

[0249] 2.3 Restoration Path

[0250] After the ninth air pipe 209 in 2.2 is connected to the atmosphere, the following passage is formed:

[0251] The seventh control end 367 of the second air circuit delayed two-position three-way reversing valve 542 is pressurized air (previously, the seventh control end 367 of the second air circuit delayed two-position three-way reversing valve 542 in 1.4.1 was full of pressurized air), the second shrink plug 552, the ninth air pipe 209, the fourth air circuit two-position three-way reversing valve 524, and the atmosphere. The fifth return spring 355 pushes the valve core to move, causing the second air circuit delayed two-position three-way reversing valve 542 to connect the fifth air pipe 205 with the ninth air pipe 209, and the fifth air pipe 205 is isolated from the atmospheric passage, making air circuit preparation for the subsequent implementation of the tensioning device charging and parking relief.

[0252] 2.4 Unlock

[0253] The first air cylinder 571 (previously 1.1.1.1.2 the first air cylinder 571 has been sufficiently filled with pressurized air), the seventh air pipe 207, the third air circuit on-off valve 513 (located at the connected position), the first pressure regulating valve 567, the third air circuit two-position three-way reversing valve 523, the sixth air pipe 206, the first air circuit delayed two-position three-way reversing valve 541 and the sixth control end 366 (previously 1.3 the pressurized air of the sixth control end 366 has been exhausted. Due to the existence of the first shrink plug 551, at the beginning the reset force of the fourth reset spring 354 is greater than the thrust of the pressurized air of the sixth control end 366, and the fourth air pipe 204 is connected to the sixth air pipe 206), the fourth air pipe 204;

[0254] 2.4.1 The nineteenth air pipe 219 and the twelfth control end 372 of the first two-position five-way reversing valve 568 (the pressure air has been exhausted from the eleventh control end 371 in 1.10.1 above). The pressure air is present at the twelfth control end 372. The pressure air pushes the valve core to move, so that the fifteenth air pipe 215 is connected to the sixteenth air pipe 216, and the fifteenth air pipe 215 is disconnected from the seventeenth air pipe 217. Meanwhile, the seventeenth air pipe 217 is connected to the atmosphere, so as to connect the rear chamber of the outer cylinder 323 to the atmosphere and eliminate the air back pressure of the inner cylinder 324 moving backward.

[0255] 2.4.2 The fourth control end 364 of the second gas circuit two-position three-way reversing valve 522 (previously in 1.10.2 the fifth control end 365 has been exhausted of pressurized air, the pressurized air at the fourth control end 364 pushes the valve core to move, and the fourth gas pipe 204 is connected with the third gas pipe 203), the third gas pipe 203, the first gas circuit two-position three-way reversing valve 521 (previously in 1.8 the third control end 363 of the first two-position three-way reversing valve has been exhausted of pressurized air, and the second gas pipe 202 is restored to the state of being connected with the third gas pipe 203), and the second gas pipe 202;

[0256] 2.4.2.1 The second control end 362 of the first gas circuit on-off valve 511 (at this time, there is no pressurized air at the first control end 361, and the air pressure at the second control end 362 + the reset force of the second reset spring 352 is greater than the pressure at the first control end 361, so the valve core does not move, and the first gas circuit remains disconnected from the atmosphere);

[0257] 2.4.2.2 The twentieth air pipe 220, the second air inlet hole 406, and the locking cylinder 337 (pushing the locking pin 338 to move backward, pulling the latch 344 out of the tooth groove of the outer tooth 347 of the annular locking gear 343, unlocking the inner cylinder body 324 and the outer cylinder body 323, and connecting the second air inlet hole 406 to the first air exchange hole 407).

[0258] 2.5 Parking brake

[0259] After the second air inlet 406 and the first air exchange hole 407 are connected in the above 2.4.2.2.

[0260] The first air exchange hole 407, the fifteenth air pipe 215, the first two-position five-way reversing valve 568 (the fifteenth air pipe 215 and the sixteenth air pipe 216 in item 2.4.1 are already connected), the sixteenth air pipe 216, the first air pipe 201 (at this time, the first control end 361 and the second control end 362 of the first air path on-off valve 511 have isobaric pressure air, and the thrust formed by the air pressure of the second control end 362 + the reset force of the second reset spring 352 is greater than the thrust of the air pressure of the first control end 361, so the first air path on-off valve 511 is still disconnected from the atmosphere), the first air inlet hole 401, the front of the outer cylinder body 323 The inner chamber of the outer cylinder 323 is pushed to slide backward, so that the front chamber of the outer cylinder 323 is connected with the second air exchange hole 402. The inner cylinder 324 slides backward and pulls the vehicle mechanical brake device through the core rod until the brake shoe is close to the wheel. The inner piston 325 and the pull rod cannot move backward any further due to the obstruction of the wheel. At this time, the air thrust of the pressure in the front chamber of the outer cylinder 323 is still greater than the elastic force of the preload spring 326. Therefore, the inner cylinder 324 continues to move backward until the air thrust of the pressure in the front chamber of the outer cylinder 323 is consistent with the elastic force of the preload spring 326 (ignoring the resistance). The inner cylinder 324 can no longer move backward. At this time, the vehicle realizes parking braking);

[0261] 2.6 Locking

[0262] Based on the above 2.5, after the front chamber of the outer cylinder body 323 is connected with the second ventilation hole 402, the following passage is formed:

[0263] The second ventilation hole 402, the thirteenth air pipe 213;

[0264] 2.6.1 The fifth gas circuit two-position three-way reversing valve 525 and the ninth control end 369 (the pressure air of the tenth control end 370 in 1.7.2 and 1.7.2.2 has been exhausted to the atmosphere, and the pressure air of the ninth control end 369 pushes the valve core to move, so that the thirteenth gas pipe 213 is connected with the twelfth gas pipe 212), the twelfth gas pipe 212 (the existence of the third shrink plug 553, the pressure of the third control end 363 of the first gas circuit two-position three-way reversing valve 521 gradually increases, slowly pushing the first gas circuit two-position three-way reversing valve 525 to move the valve core ...5 to move the valve core, so that the thirteenth gas pipe 213 is connected with the twelfth gas pipe 212 The valve core of the two-position three-way reversing valve 521 is used to delay the disconnection of the third air pipe 203 from the second air pipe 202, and delay the connection of the second air pipe 202 with the atmosphere. The purpose is to provide a sufficient time period, and when the inner cylinder 324 can no longer move backward, the action of locking the relative position of the inner cylinder 324 and the outer cylinder 323 is started), the third control end 363 of the two-position three-way reversing valve 521 of the first air path (to disconnect the third air pipe 203 from the second air pipe 202, and connect the second air pipe 202 with the atmosphere);

[0265] Since the second air pipe 202 is connected to the atmosphere, the following passage is formed:

[0266] 2.6.2 Locking cylinder 337, second air inlet 406, twentieth air pipe 220, second air pipe 202, first air circuit two-position three-way reversing valve 521, atmosphere (after the pressurized air in the locking cylinder 337 is discharged to the atmosphere, the first return spring 351 pushes the locking pin 338 to slide forward).

[0267] The locking process of the locking pin 338 has the following two situations:

[0268] 2.6.2.1 The action of the components when the latching tooth 344 is directly opposite to the tooth groove of the external tooth 347 and the latching tooth 344 can smoothly enter the tooth groove of the external tooth 347:

[0269] Pushed by the elastic force of the first return spring 351, the locking pin 338 slides forward, and the latch tooth 344 is pushed into the tooth groove of the outer tooth 347 of the annular locking gear 343, and the relative positions of the inner cylinder body 324 and the outer cylinder body 323 are locked, fixing the tensioning state of the tensioning device.

[0270] 2.6.2.2 The action of the components and the pressure air flow path when the latching teeth 344 and the outer teeth 347 are misaligned and the latching teeth 344 cannot enter the outer teeth 347 are:

[0271] Because the latching tooth 344 cannot enter the tooth groove of the outer tooth 347, the locking pin 338 is blocked from moving forward to the extreme position (the locking pin 338 can only move forward a certain distance and block the first air exchange hole 407), resulting in the first air exchange hole 407 being unable to communicate with the vent hole 408 and the second air inlet hole 406, and the pressurized air in the first air exchange hole 407 cannot be discharged, forming the following passage:

[0272] The front chamber of the outer cylinder 323, the first air inlet 401, the first air pipe 201, the first air circuit on-off valve 511, the fourth shrink plug 554, and the atmosphere (because the pressure air at the second control end 362 has been discharged into the atmosphere through the first air circuit two-position three-way reversing valve 521, at this time, only the first control end 361 has pressurized air, and the thrust of the pressure air at the first control end 361 of the first air circuit on-off valve 511 is greater than the restoring force of the second return spring 352. Under the push of the pressure air at the first control end 361 and the first air pipe 201, the piston of the first air circuit on-off valve 511 moves and compresses the second return spring 352, and the first air circuit on-off valve 511 makes the first The air pipe 201 is connected to the atmosphere through the fourth shrink plug 554. The existence of the fourth shrink plug 554 causes the pressurized air in the front chamber of the outer cylinder body 323 to be slowly discharged, and the air pressure in the front chamber of the outer cylinder body 323 slowly decreases, and the thrust on the inner cylinder body 324 gradually decreases. The inner cylinder body 324 slowly moves forward under the action of the preload spring 326, driving the annular locking gear 343 to rotate slowly. When the latching tooth 344 is aligned with the tooth groove of the outer tooth 347 of the annular locking gear 343, the latching tooth 344 enters the tooth groove of the outer tooth 347 of the annular locking gear 343 under the push of the locking pin 338, and the inner cylinder body 324 and the outer cylinder body 323 are locked with each other).

[0273] 2.7 Indicator plate 305 extends

[0274] 2.7.1 The pressure air of the 13th air pipe 213, the 43rd air pipe 243, and the 17th control end 377 of the second two-position five-way reversing valve 577 in 2.6 above. The valve core of the second two-position five-way reversing valve 577 moves, so that the 39th air pipe 239 is connected to the 40th air pipe 240, and the 41st air pipe 241 is connected to the third exhaust hole 412;

[0275] 2.7.2 The locking pin 338 and the pneumatic piston 341 in 2.6.2.1 and 2.6.2.2 mentioned above move to the front, so that the first air exchange hole 407 communicates with the vent hole 408, forming the following air path:

[0276] The third control end 363 of the first gas circuit two-position three-way reversing valve 521, the twelfth gas pipe 212 (the existence of the third shrink plug 553, the gas slowly flows back), the fifth gas circuit two-position three-way reversing valve 525 and the control end 369 (the thirteenth gas pipe 213 and the twelfth gas pipe 212 are connected in 2.6.1 before), the thirteenth gas pipe 213, the second air exchange hole 402, the front chamber of the outer cylinder body 323, the first air inlet hole 401, the first gas pipe 201, the sixteenth gas pipe 216, the first two-position five-way reversing valve 568 (the fifteenth gas pipe 216 in 2.4.1 before 5 is connected with the sixteenth air pipe 216), the fifteenth air pipe 215, the first air exchange hole 407, the air pressure chamber 342 of the locking cylinder 337, the vent hole 408, the thirty-ninth air pipe 239, the second two-position five-way reversing valve 577 (previously 2.7.1 the thirty-ninth air pipe 239 is connected with the fortieth air pipe 240), the fortieth air pipe 240, the second detection hole 303 (pushing the sliding piston 302 in the sliding cylinder 301, driving the sliding rod 306 and the indicator plate 305 to extend to the front extreme position so that the spring card bead 308 is stuck in the annular card groove 309 to achieve locking).

[0277] 2.7.2.1 The air in front of the slide cylinder 301 passes through the first detection hole 304, the 41st air pipe 241, the second two-position five-way reversing valve 577 (previously 2.7.1 the 41st air pipe 241 has been connected to the third exhaust hole 412), the third exhaust hole 412, and the atmosphere, eliminating the air back pressure generated when the sliding piston 302 moves forward.

[0278] 2.7.2.2 The second detection hole 303, the bypass groove 307 (after the sliding piston 302 moves to the front extreme position, the middle chamber of the slide cylinder 301 and the first detection hole 304 are connected through the bypass groove 307), the first detection hole 304, the forty-first air pipe 241, the second two-position five-way reversing valve 577 (previously in 2.7.1 the forty-first air pipe 241 has been connected to the third exhaust hole 412), the third exhaust hole 412, and the atmosphere.

[0279] 2.8 Restoration Path

[0280] Since the pressurized air of the third control end 363 of the first gas circuit two-position three-way reversing valve 521 in 2.7.2 and 2.7.2.2 is discharged to the atmosphere, the third return spring 353 of the first gas circuit two-position three-way reversing valve 521 pushes the valve core to reset, and the second gas pipe 202 is disconnected from the atmospheric passage, and the second gas pipe 202 and the third gas pipe 203 are restored to be connected, so as to prepare the passage for the next step of the tensioning device to be relieved from air filling and parking;

[0281] 2.9 Cut off the gas supply

[0282] The first air cylinder 571, the seventh air pipe 207, the third air circuit two-position three-way reversing valve 523 (previously 2.2 the sixth air pipe 206 is connected to the seventh air pipe 207), the sixth air pipe 206, the first air circuit delayed two-position three-way reversing valve 541 (the existence of the first shrink plug 551, the thrust of the pressurized air of the sixth control end 366 gradually exceeds the reset force of the fourth spring 354, the pressurized air gradually pushes the valve core to move and compresses the fourth reset spring 354, so that the fourth air pipe 204 is disconnected from the sixth air pipe 206, and the fourth air pipe 2 04 is connected to the atmosphere. The purpose is to make the air supply of the sixth air pipe 206 continue for a period of time, and after the parking brake and locking of the tensioning device are achieved, the air supply is cut off through the first air circuit delayed two-position three-way reversing valve 541 to prevent the seventh air pipe 207 from continuously supplying air to the air pressure control system passage, and after the first air circuit two-position three-way valve reversing valve 521 is connected to the third air pipe 203 and the second air pipe 202, causing the locking device to be unlocked for the second time and inflated to the front of the outer cylinder 323, thereby interfering with the normal parking brake operation of the vehicle);

[0283] 2.10 Remove the pressurized air in the reversing valve

[0284] 2.10.1 The first two-position five-way reversing valve 568, the twelfth control end 372, the nineteenth air pipe 219, the fourth air pipe 204, the first air circuit delayed two-position three-way reversing valve 541, and the atmosphere (the first air circuit delayed two-position three-way reversing valve 541 in 2.9 above makes the fourth air pipe 204 connected to the atmosphere, and the twelfth control end 372 loses the thrust of the compressed air, so as to prepare for the next reversal);

[0285] 2.10.2 The third air pipe 203, the second air circuit two-position three-way reversing valve 522 and the fourth control end 364, the fourth air pipe 204, the first air circuit delayed two-position three-way reversing valve 541, and the atmosphere (the above 2.9 first air circuit delayed two-position three-way reversing valve 541 makes the fourth air pipe 204 connected to the atmosphere, and the fourth control end 364 loses the thrust of the compressed air, preparing for the next reversal).

[0286] Such a pipeline design realizes that the tensioning device is automatically unlocked, automatically parked and released, and automatically locked when the train controller is manually charged and pressurized, and automatically unlocked, automatically parked and braked, and automatically locked when the train controller is manually emptied and the air pressure in the brake cylinder is insufficient. At the same time, the indicator plate 305 will retract inwards after the tensioning device is unlocked, parked and released, and locked, and the indicator plate 305 will extend outwards after the tensioning device is unlocked, parked and braked, and locked. Therefore, the position of the indicator plate 305 can reliably reflect the working position of the tensioning device, which is convenient for on-site staff to check and confirm the working status of the tensioning device from a distance.

[0287] Example 5

[0288] The tensioning device is provided with a pressure control device, and the pressure control device is an air pressure control system with continuous air supply:

[0289] This embodiment is an improvement based on the third embodiment, and is applicable to the automatic control of tightening or loosening various ropes, chains, power lines, pipelines, conveyor belts, mechanical transmission devices, riveting devices, braking devices, etc. by using the tensioning device;

[0290] The rear part of the front section of this embodiment is provided with a second exhaust hole 403. When the inner cylinder body 324 slides to the front extreme position, the second air exchange hole 402 is connected with the second exhaust hole 403; when the inner cylinder body slides to the rear extreme position, the second air exchange hole 402 is separated from the second exhaust hole 403.

[0291] One end of the twenty-second air pipe 222 is connected to the third air inlet 404, the other end of the twenty-second air pipe 222 is connected to one end of the twenty-third air pipe 223 or the atmosphere through the seventh air circuit two-position three-way reversing valve 527, the other end of the twenty-third air pipe 223 is connected to the first air exchange hole 407, the second air inlet 406 is connected to one end of the twenty-fourth air pipe 224, and one end of the twenty-fifth air pipe 225 is connected to the other end of the twenty-fourth air pipe 224 or one end of the twenty-sixth air pipe 226 through the two-position four-way reversing valve 573, wherein when the twenty-fifth air pipe 225 is connected to the other end of the twenty-fourth air pipe 224, one end of the twenty-sixth air pipe 226 is connected to the atmosphere; the twenty-fifth air pipe 225 is cut off from the twenty-fourth air pipe 224, and when it is connected to one end of the twenty-sixth air pipe 226, the The passage between the twenty-sixth air pipe 226 and the atmosphere is cut off; the other end of the twenty-fifth air pipe 225 is connected to the second parking air cylinder 572, the second parking air cylinder 574 is provided with the second pressure regulating valve 574, the second parking air cylinder 572 is connected to one end of the twenty-seventh air pipe 227, the other end of the twenty-seventh air pipe 227 is connected to one end of the twenty-eighth air pipe 228 through the second check valve 569, the second check valve 569 only allows gas to flow from the twenty-eighth air pipe 228 to the twenty-seventh air pipe 227, the other end of the twenty-eighth air pipe 228 is connected to one end of the twenty-ninth air pipe 229 through the second dust filter 570, the other end of the twenty-ninth air pipe 229 is connected to one end of the thirtieth air pipe 230 through the sixth air path on-off valve 516, the other end of the thirtieth air pipe 230 is connected to an external air source;

[0292] One end of the thirty-seventh air pipe 237 is connected to the twenty-fourth air pipe 224, and the other end of the thirty-seventh air pipe 237 is connected to the atmosphere through the fourth air path on-off valve 514;

[0293] The other end of the 26th air pipe 226 is connected to one end of the 31st air pipe 231 through the fifth air circuit on-off valve 515, and one end of the 32nd air pipe 232 is connected to the other end of the 31st air pipe 231 or the atmosphere through the eighth air circuit two-position three-way reversing valve 528. The air hole of the eighth air circuit two-position three-way reversing valve 528 connected to the atmosphere is provided with a sixth shrink plug 556, and the other end of the 32nd air pipe 232 is connected to the first air inlet 401;

[0294] The eighth gas path two-position three-way reversing valve 528 is provided with a thirteenth control end 373 and a seventh return spring 357. When the pressure air thrust of the thirteenth control end 373 is greater than the elastic force of the seventh return spring 357, the thirteenth control end 373 pushes the valve core to move and compress the seventh return spring 357, so that the thirty-second gas pipe 232 is separated from the thirty-first gas pipe 231, and the thirty-second gas pipe 232 is connected to the atmosphere. When the pressure air thrust of the thirteenth control end 373 is less than the elastic force of the seventh return spring 357, the seventh return spring 357 pushes the valve core to move, the thirty-second gas pipe 232 is connected to the thirty-first gas pipe 231, and the thirty-second gas pipe 232 is disconnected from the atmosphere.

[0295] The thirteenth control end 373 is connected to one end of the thirty-third air pipe 233, and the other end of the thirty-third air pipe 233 is connected to one end of the thirty-fourth air pipe 234 or the atmosphere through the sixth air path two-position three-way reversing valve 526. The thirty-third air pipe 233 is provided with a fourth shrink plug 554, and the other end of the thirty-fourth air pipe 234 is connected to the twenty-third air pipe 223;

[0296] The fourth gas circuit on-off valve 514 and the sixth gas circuit two-position three-way reversing valve 526 share the fourteenth control end 374 and the eighth return spring 358, the fourteenth control end 374 is connected to one end of the thirty-fifth gas pipe 235, and the other end of the thirty-fifth gas pipe 235 is connected to the second air exchange hole 402; when there is pressurized air at the fourteenth control end 374, the fourteenth control end 374 pushes the valve core to move and compress the eighth return spring 358, the thirty-third gas pipe 233 is connected to the thirty-fourth gas pipe 234, and the thirty-seventh gas pipe 237 is connected to the atmosphere; when there is no pressurized air at the fourteenth control end 374, the eighth return spring 358 pushes the valve core to move to disconnect the thirty-third gas pipe 233 from the thirty-fourth gas pipe 234, the thirty-third gas pipe 233 is connected to the atmosphere, and the thirty-seventh gas pipe 237 is isolated from the atmosphere;

[0297] The two-position four-way reversing valve 573 and the seven-position three-way reversing valve 527 share the fifteenth control end 375 and the ninth return spring 359. The fifteenth control end 375 is connected to one end of the thirty-sixth air pipe 236, and the other end of the thirty-sixth air pipe 236 is connected to the twenty-eighth air pipe 228. When there is pressurized air at the fifteenth control end 375, the fifteenth control end 375 pushes the valve core to move and compress the ninth return spring 359, and the twenty-second air pipe 222 is connected to the twenty-third air pipe 223, and the twenty-second air pipe 222 is connected to the atmosphere. The 25th air pipe 225 is connected to the 24th air pipe 224, and the 26th air pipe 226 is connected to the atmosphere; when there is no pressurized air at the 15th control end 375, the ninth return spring 359 pushes the valve core to move, the 22nd air pipe 222 is connected to the atmosphere, the 23rd air pipe 223 is disconnected from the 22nd air pipe 222, the 25th air pipe 225 is connected to the 26th air pipe 226, the 26th air pipe 226 is disconnected from the atmosphere, and the passage between the 24th air pipe 224 and the 25th air pipe 225 is cut off;

[0298] The air storage cylinder 575 is connected to the twenty-third air pipe 223 through the thirty-eighth air pipe 238 .

[0299] The vent hole 408 is connected to one end of the forty-fourth air pipe 244, and one end of the forty-fifth air pipe 245 is connected to the other end of the forty-fourth air pipe 244 or the fourth exhaust hole 413 through the ninth air circuit two-position three-way reversing valve 529; the ninth air circuit two-position three-way reversing valve 529 is provided with an eighteenth control end 378 and a nineteenth control end 379, the eighteenth control end 378 is connected to the thirty-fifth air pipe 235 through the forty-ninth air pipe 249, and the nineteenth control end 379 is connected to one end of the forty-seventh air pipe 247; when the eighteenth control end 378 has pressurized air When the valve core is pushed to move, the forty-fourth air pipe 244 is connected to the forty-fifth air pipe 245. When there is pressurized air at the nineteenth control end 379, the valve core is pushed in the reverse direction to connect the forty-fifth air pipe 245 with the fourth exhaust hole 413. The other end of the forty-fifth air pipe 245 is connected to the second detection hole 303, the other end of the forty-seventh air pipe 247 is connected to one end of the forty-sixth air pipe 246 and one end of the forty-eighth air pipe 248, the other end of the forty-sixth air pipe 246 is connected to the twenty-second air pipe 222, and the other end of the forty-eighth air pipe 248 is connected to the first detection hole 304.

[0300] The display device includes a slide cylinder 301, a slide rod 306, a sliding piston 302 and an indicator plate 305. The sliding piston 302 is slidably matched in the slide cylinder 301. The side wall of the sliding piston 302 is provided with a spring clamping bead 308. The inner walls of both ends of the slide cylinder 301 are respectively provided with annular clamping grooves 309 for the spring clamping bead 308 to be clamped. One end of the slide rod 306 is fixed to the sliding piston 302, and the other end of the slide rod 306 is slidably extended to the outside of the slide cylinder 301. The indicator plate 305 is arranged on the sliding rod 306 outside 01, and a first detection hole 304 connected to the inside of the sliding cylinder 301 is arranged at one end of the sliding cylinder 301 close to the indicator plate 305, and a second detection hole 303 connected to the inside of the sliding cylinder 301 is arranged at one end of the sliding cylinder 301 away from the indicator plate 305; a longitudinal bypass groove 307 for ventilation is arranged on the inner wall of the rear side of the sliding cylinder 301, and when the sliding piston 302 slides to the rear extreme position, the bypass groove 307 can connect the middle chamber of the sliding cylinder 301 with the first detection hole 304.

[0301] The indicator plate 305 of the display device of this solution is arranged toward the outside of the vehicle, and the indicator plate 305 can be extended or retracted to facilitate operators to view from a distance.

[0302] The second exhaust hole 403 is provided in this embodiment to remove the residual pressurized air in the pipeline connected to the second air exchange hole 402, so that the six gas circuit two-position three-way reversing valve 526, the fourteenth control end 374 of the fourth gas circuit on-off valve 514, and the eighteenth control end 378 of the ninth gas circuit two-position three-way reversing valve 529 are always connected to the atmosphere when there is no pressurized air pushing, thereby ensuring that the sixth gas circuit two-position three-way reversing valve 526, the fourth gas circuit on-off valve 514 and the ninth gas circuit two-position three-way reversing valve 529 can function reliably.

[0303] The twenty-ninth air pipe 229 of this embodiment is provided with a second dust filter 570 to prevent impurities in the external air source from entering the air pressure control system of the tensioning device. The twenty-fifth air pipe is provided with a second pressure regulating valve 574, which can control the air pressure supplied to the inside of the tensioning device by the second air cylinder 572, so as to adjust the tensioning force output by the tensioning device. The fifth air circuit on-off valve 515 can cut off the exhaust parking brake function of the tensioning device when the tensioning device fails, so that it remains in the air-filled parking relief state. The sixth air circuit on-off valve 516 is used to cut off the tensioning device (if the sixth air circuit on-off valve 516 is closed after the tensioning device has completed the unlocking and parking brake lock after the external air source is artificially exhausted and decompressed, the tensioning device will not realize the air-filled parking relief function with the artificial air-filled pressure increase of the external air source).

[0304] The second check valve 569 ensures that the pressurized air in the twenty-eighth air pipe 228 can smoothly enter the second air cylinder 572 when the external air source is artificially charged and pressurized. When the external air source is artificially exhausted and depressurized, it can also prevent the pressurized air in the second air cylinder 572 from flowing back to the external air source, thereby providing sufficient pressure air power for the tensioning device to implement the tensioning effect.

[0305] It should be noted that the shrink plug used in this embodiment is a commonly used component in the art, and its function is to reduce the air flow rate and make it pass slowly.

[0306] Here’s how it works:

[0307] In the initial state (when there is no artificial air inflation and pressurization by the external air source), the fourteenth control terminal 374, the fifteenth control terminal 375 and the thirteenth control terminal 373 have no pressurized air.

[0308] 1. Air-filling parking relief

[0309] When the external air source is used to artificially increase the pressure, the flow direction of the pressurized air is as follows:

[0310] 1.1 Air filling

[0311] 1.1.1 External air source, the 30th air pipe 230, the sixth air path on-off valve 516 (located in the connecting position), the 29th air pipe 229, the second dust filter 570, and the 28th air pipe 228;

[0312] 1.1.2 The thirty-sixth air pipe 236 and the fifteenth control terminal 375;

[0313] 1.2 Gas path conversion

[0314] Because the fifteenth control end 375 is charged with air and pressurized, the valve cores of the two-position three-way reversing valve 527 and the two-position four-way reversing valve 573 of the seventh gas path are pushed to move and compress the ninth return spring 359, so that the twenty-second gas pipe 222 is connected with the twenty-third gas pipe 223, the twenty-second gas pipe 222 is isolated from the atmosphere, the twenty-fifth gas pipe 225 is connected with the twenty-fourth gas pipe 224, and the twenty-sixth gas pipe 226 is connected with the atmosphere);

[0315] 1.3 Unlock

[0316] The twenty-eighth air pipe 228, the second check valve 569, the twenty-seventh air pipe 227, the second air cylinder 572, the twenty-fifth air pipe 225, the second pressure regulating valve 574, the two-position four-way reversing valve 573, the twenty-fourth air pipe 224, the second air inlet hole 406, the air pressure chamber 342 of the locking cylinder 337 (the locking pin 338 is pushed to slide backward, the latching tooth 344 withdraws from the tooth groove of the outer tooth 347 of the annular locking gear 343, the relative positions of the inner cylinder body 324 and the outer cylinder body 323 are unlocked, and the second air inlet hole 406 is connected with the first air exchange hole 407 through the air pressure chamber 342 of the locking cylinder 337);

[0317] 1.4 Parking Mitigation

[0318] 1.4.1 Previously, 1.2, the twenty-sixth air pipe 226 is connected to the atmosphere, thereby forming the following passage: the front chamber of the outer cylinder 323, the first air inlet 401, the thirty-second air pipe 232, the eighth air circuit two-position three-way reversing valve 528 (at this time, the thirteenth control end 373 has no pressure air, and the thirty-second air pipe 232 is connected to the thirty-first air pipe 231), the thirty-first air pipe 231, the fifth air circuit on-off valve 515 (located in the connecting position), the twenty-sixth air pipe 226, the two-position four-way reversing valve 573, and the atmosphere. The air back pressure of the inner cylinder 324 sliding forward is eliminated.

[0319] 1.4.2 Previously, the second air inlet 406 and the first air exchange hole 407 are connected through the locking cylinder 337, thereby forming the following passage:

[0320] The first air exchange hole 407, the twenty-third air pipe 223, the seventh air path two-position three-way reversing valve 527, the twenty-second air pipe 222, the third air inlet hole 404, and the rear chamber of the outer cylinder 323 push the inner cylinder 324 to slide forward to achieve parking relief;

[0321] 1.5 Indicator plate 305 retracts

[0322] Previously 1.4.2 the pressure air of the twenty-second air pipe 222 and the forty-sixth air pipe 246;

[0323] 1.5.1 The 47th air pipe 247, the 9th air circuit two-position three-way reversing valve 529 and the 19th control end 379 push the valve core to move, so that the 45th air pipe 245 is connected to the fourth exhaust hole 413.

[0324] 1.5.2 The 48th air pipe 248 and the first detection hole 304 push the sliding piston 302 to drive the sliding rod 306 and the indicator plate (305) to retract. At the same time, the air in front of the sliding piston 302 passes through the 45th air pipe 245, the 9th air path two-position three-way reversing valve 529, the fourth exhaust hole 413, and the atmosphere to eliminate the back pressure of the sliding piston 302.

[0325] 1.6 Air storage cylinder charging and pressurization

[0326] The pressurized air of the first air exchange hole 407 in 1.4.2, the twenty-third air pipe 223, the thirty-eighth air pipe 238, and the air storage cylinder 575 (for storing pressurized air);

[0327] 2. Exhaust parking brake

[0328] 2.1 Exhaust

[0329] When an external air source is used to exhaust the unpressurized air, the following passage is formed:

[0330] The fifteenth control terminal 375, the thirty-sixth air pipe 236, the twenty-eighth air pipe 228, the second dust filter 570, the twenty-ninth air pipe 229, the sixth air path on-off valve 516 (located in the connected position), the thirtieth air pipe 230, and the external air source.

[0331] 2.2 Gas path conversion

[0332] Since the fifteenth control end 375 has no thrust of pressurized air, the ninth return spring 359 pushes the valve cores of the second-position three-way reversing valve 527 and the second-position four-way reversing valve 573 of the seventh gas path to move, so that the twenty-second gas pipe 222 is connected to the atmosphere, the twenty-third gas pipe 223 is isolated from the twenty-second gas pipe 222, the twenty-fifth gas pipe 225 is connected to the twenty-sixth gas pipe 226, the twenty-sixth gas pipe 226 is isolated from the atmosphere, and the passage between the twenty-fourth gas pipe 224 and the twenty-fifth gas pipe 225 is isolated);

[0333] 2.3 Parking brake

[0334] 2.3.1 The rear chamber of the outer cylinder 323, the 22nd air pipe 222, the 7th air circuit two-position three-way reversing valve 527 (the 22nd air pipe 222 in 2.2 is connected to the atmosphere), and the atmosphere, to avoid air back pressure when the inner cylinder 324 slides backward;

[0335] 2.3.2 The second air cylinder 572, the 25th air pipe 225, the two-position four-way reversing valve 573 (the 25th air pipe 225 is connected to the 26th air pipe 226 in 2.2 above), the 26th air pipe 226, the fifth air circuit on-off valve 515 (located in the connecting position), the 31st air pipe 231, the eight air circuit two-position three-way reversing valve 528 (at this time, the 13th control end 373 still has no pressurized air, the 31st air pipe 231 is connected to the 32nd air pipe 232), the 32nd air pipe 232, the first air inlet 401, the front chamber of the outer cylinder 323 (pushing the inner cylinder 324 to slide backward until the inner cylinder 324 can no longer slide backward). The inner cylinder 324 moves backwards and further compresses the preload spring 326 until the air thrust in the front chamber of the outer cylinder 323 is consistent with the preload spring 326 (ignoring resistance). The inner cylinder 324 can no longer move backwards. At this time, the tensioning device tightens the mechanical brake device of the vehicle, and the vehicle is parked).

[0336] 2.4 Locking

[0337] 2.4.1 The inner cylinder 324 moves backward so that the front chamber of the outer cylinder 323 is connected to the second air exchange hole 402, and then the second air exchange hole 402, the thirty-fifth air pipe 235, and the fourteenth control end 374 (push the valve cores of the fourth air circuit on-off valve 514 and the sixth air circuit two-position three-way reversing valve 526 to move, compress the eighth return spring 358, so that the thirty-third air pipe 233 is connected to the thirty-fourth air pipe 234, the passage of the thirty-third air pipe 233 to the atmosphere is blocked, and the thirty-seventh air pipe 237 is connected to the atmosphere);

[0338] 2.4.2 The air pressure chamber 342 of the locking cylinder 337, the second air inlet hole 406, the 24th air pipe 224, the 37th air pipe 237, the fourth air circuit on-off valve 514 (previously 2.4.1 the 37th air pipe 237 is connected to the atmosphere), the atmosphere, that is, the pressurized air in the air pressure chamber 342 of the locking cylinder 337 is discharged to the atmosphere, and the first return spring 351 pushes the locking pin 338 to slide forward;

[0339] The locking process of the latch teeth 344 has the following two situations:

[0340] 2.4.2.1 The action of the components and the pressure air flow path when the latching teeth 344 and the outer teeth 347 are facing each other and the latching teeth 344 can smoothly enter the outer teeth 347:

[0341] Pushed by the elastic force of the first return spring 351 , the locking pin 338 slides forward, and the latching tooth 344 is pushed into the tooth groove of the outer tooth 347 of the annular locking gear 343 , and the relative positions of the inner cylinder body 324 and the outer cylinder body 323 are locked.

[0342] 2.4.2.2 The latching teeth 344 and the tooth grooves of the outer teeth 347 are misaligned, and the latching teeth 344 cannot enter the tooth grooves of the outer teeth 347. The operating conditions of the components and the flow path of the pressure air are:

[0343] The first return spring 351 cannot push the locking pin 338 to slide forward, and the locking pin 338 can only move forward a certain distance. The first ventilation hole 407 is blocked by the locking pin 338, and the first ventilation hole 407 cannot communicate with the ventilation hole 408 and the second air inlet hole 406. The accompanying airflow flows to:

[0344] The air storage cylinder 575, the thirty-eighth air pipe 238, the twenty-third air pipe 223, the thirty-fourth air pipe 234, the sixth air circuit two-position three-way reversing valve 526 (the thirty-fourth air pipe 234 and the thirty-third air pipe 233 are connected in 2.4.1 above), the thirty-third air pipe 233 (due to the fifth shrink plug 555, the pressurized air slowly enters the thirteenth control end 373 of the eighth air circuit two-position three-way valve 528, gradually pushing the valve core of the eighth air circuit two-position three-way reversing valve 528 to move and compressing the seventh return spring 357, so that the thirty-second air pipe 232 is connected to the atmosphere through the sixth shrink plug 556, and the thirty-second air pipe 232 is blocked from the thirty-first air pipe 231. The fifth shrink plug 555 is provided to wait until the inner cylinder moves to the rear limit position, and when the locking pin 338 cannot smoothly move to the front limit position, the eighth air circuit two-position three-way reversing valve 528 is controlled to discharge the pressurized air in the front of the outer cylinder to move the inner cylinder forward);

[0345] The front chamber of the outer cylinder body 323, the first air inlet hole 401, the thirty-second air pipe 232, the sixth reduction plug 556 of the eighth air circuit two-position three-way reversing valve 528 (previously, in 2.4.2.2, the thirty-second air pipe 232 was connected to the atmosphere, and with the existence of the sixth reduction plug 556, the gas in the front chamber of the outer cylinder body 323 was slowly discharged to the atmosphere. At this time, the thrust of the front chamber of the outer cylinder body 323 on the inner cylinder body 324 gradually decreased, and the corresponding preload spring 326 would push the inner cylinder body 324 to slowly slide forward. During this sliding process, the inner cylinder body 324 drives the annular locking gear 343 to rotate slowly, and the outer tooth 347 tooth groove of the annular locking gear 343 gradually faces the latch tooth 344. Under the action of the first reset spring 351, the locking pin 338 pushes the latch tooth 344 into the tooth groove of the outer tooth 347 of the annular locking gear 343, thereby achieving relative position locking of the inner cylinder body 324 and the outer cylinder body 323).

[0346] 2.5 Indicator plate 305 extends

[0347] 2.5.1 Previously, 2.4.1, the inner cylinder 324 moves backward so that the front chamber of the outer cylinder 323 is connected to the second air exchange hole 402, then the second air exchange hole 402, the thirty-fifth air pipe 235, the forty-ninth air pipe 249, the eighteenth control end 378 of the ninth air path two-position three-way reversing valve 529 (pushes the valve core to move so that the forty-fourth air pipe 244 is connected to the forty-fifth air pipe 245);

[0348] 2.5.2 After the locking pin 338 in 2.4.2.1 and 2.4.2.2 moves to the front, the first ventilation hole 407 is connected with the ventilation hole 408 to form the following passage:

[0349] 2.5.2.1 air storage cylinder 575, 38th air pipe 238, 23rd air pipe 223;

[0350] 2.5.2.2 The thirteenth control end 373 of the two-position three-way valve 528 of the eighth gas circuit, the thirty-third gas pipe 233, the fifth shrink plug 555 (the existence of the fifth shrink plug 555 causes the pressurized air to slowly flow backwards), the two-position three-way reversing valve 526 of the sixth gas circuit, the thirty-fourth gas pipe 234, and the twenty-third gas pipe 223;

[0351] After the two pressure airs merge into the twenty-third air pipe 223, they enter the following passages:

[0352] The first ventilation hole 407, the locking cylinder 337, the ventilation hole 408, the forty-fourth air pipe 244, the ninth air circuit two-position three-way reversing valve 529 (the forty-fourth air pipe 244 and the forty-fifth air pipe 245 were previously connected in 2.5.1), the forty-fifth air pipe 245, the second detection hole 303 (pushing the sliding piston 302 to drive the sliding rod 306 and the indicator plate 305 to extend, when the sliding piston 302 slides to the rear extreme position, the bypass groove 307 connects the middle chamber of the sliding cylinder 301 to the first detection hole 304), the first detection hole 304, the forty-eighth air pipe 248, the forty-sixth air pipe 246, the twenty-second air pipe 222 (the twenty-second air pipe 222 in 2.2 has been connected to the atmosphere), and the atmosphere.

[0353] 2.6 Restoration Path

[0354] The air pressure at the thirteenth control end 373 of the two-position three-way reversing valve 528 of the eighth air path gradually decreases, and the seventh return spring 357 stretches and pushes the valve core to move, so that the thirty-second air pipe 232 and the thirty-first air pipe 231 are restored to be connected, and the thirty-second air pipe 232 is isolated from the atmosphere (to prepare the air path for the next air-filling and parking relief of the tensioning device);

[0355] Such a pipeline design realizes that the tensioning device is automatically unlocked and automatically parked when the external air source is artificially charged and pressurized, and automatically parked and locked when the external air source is artificially exhausted and depressurized. At the same time, the indicator plate 305 will retract inwards after the tensioning device is unlocked and parked, and the indicator plate 305 will extend outwards after the tensioning device is parked and locked. Therefore, the position of the indicator plate 305 can reliably reflect the working position of the tensioning device, which is convenient for on-site staff to check and confirm the working status of the tensioning device from a distance.

[0356] Example 6

[0357] This embodiment is improved on the basis of embodiments 2, 4 and 5, the display device includes a detection switch 312, a light sensor 310, an indicator light 311 and a power supply 313, the other end of the slide bar 306 is provided with a contact rod, the detection switch 312 is used to detect the position of the contact rod, and the detection switch 312, the light sensor 310, the indicator light 311 and the power supply 313 form a series circuit. At night, when the slide bar 306 retracts and drives the contact rod to press the detection switch 312, the detection switch 312 disconnects the series circuit and the indicator light 311 goes out; when the slide bar 306 extends and drives the contact rod to disengage from the detection switch 312, the detection switch 312 connects the series circuit and the indicator light 311 turns on.

[0358] In this solution, the indicator light 311 of the display device is arranged toward the outside of the vehicle, and the indicator light 311 is turned on or off at night, which is convenient for operators to check from a distance.

[0359] Finally, it should be noted that the oil pressure pump 561, the first gas circuit on-off valve 511, the second gas circuit on-off valve 512, the third gas circuit on-off valve 513, the fourth gas circuit on-off valve 514, the fifth gas circuit on-off valve 515, the sixth gas circuit on-off valve 516, the first gas circuit two-position three-way reversing valve 521, the second gas circuit two-position three-way reversing valve 522, the third gas circuit two-position three-way reversing valve 523, the fourth gas circuit two-position three-way reversing valve 524, the fifth gas circuit two-position three-way reversing valve 525, the sixth gas circuit two-position three-way reversing valve 526, the seventh gas circuit two-position three-way reversing valve 527, the eighth gas circuit two-position three-way reversing valve 528, the ninth gas circuit two-position three-way reversing valve 529, the first gas circuit delayed two-position three-way reversing valve 541, the second gas circuit delayed two-position three-way reversing valve 542, the first two-position five-way reversing valve 568, the second two-position five-way reversing valve 577, the two-position four-way reversing valve 573, the first liquid circuit on-off valve 531, the second liquid circuit on-off valve 532, the third liquid circuit on-off valve 533, the fourth liquid circuit on-off valve 534, and the liquid circuit two-position three-way reversing valve 576 can all be controlled manually, pneumatically, electrically or by other mechanical means to achieve the same function.

[0360] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0361] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A screw sleeve locking type tensioning control device, It is characterized in that It comprises an outer cylinder (323), an inner cylinder (324) and a locking assembly; The inner cavity of the outer cylinder (323) is slidably matched with the inner cylinder (324), the inner cylinder (324) can slide axially but cannot rotate circumferentially relative to the outer cylinder (323), and the inner cylinder (324) is provided with a pull rod extending to the outside of the outer cylinder (323), and the pull rod is movably arranged relative to the outer cylinder (323); The outer cylinder (323) is provided with a first thrust member for axially pushing the inner cylinder (324) to slide; A locking assembly is provided between the inner cylinder (324) and the outer cylinder (323); The locking assembly includes an annular locking gear (343) and a locking pin (338); The outer wall of the inner cylinder (324) is provided with a locking external thread (345); An annular locking gear (343) is rotatably engaged with the outer cylinder body (323), the inner wall of the annular locking gear (343) is provided with a locking internal thread (346) adapted to the locking external thread (345), the outer wall of the annular locking gear (343) is provided with external teeth (347), the locking pin (338) is slidably engaged with the outer cylinder body (323), and the sliding direction of the locking pin (338) points to the external teeth (347) or away from the external teeth (347); The outer cylinder (323) is provided with a second thrust member for driving the locking pin (338) to slide.

2. A threaded sleeve locking tension control device according to claim 1, Features: The inner cavity of the inner cylinder (324) is slidably matched with an inner piston (325), and the inner piston (325) is connected to the rear end of the pull rod. The front end of the pull rod passes through the front end surfaces of the inner cylinder (324) and the outer cylinder (323) and then extends to the outside of the outer cylinder (323). The pull rod is slidably matched with the inner cylinder (324) and the outer cylinder (323) respectively. A preload spring (326) is provided between the inner piston (325) and the front end of the inner cylinder (324).

3. A threaded sleeve locking tension control device according to claim 2, Features: The pull rod includes a barrel rod (327) and a core rod (328), the core rod (328) is arranged inside the barrel rod (327), a swing gap is left between the core rod (328) and the barrel rod (327), the rear end of the barrel rod (327) is fixed to the inner piston (325), the inner piston (325) is provided with a swing hole (330) connected to the rear end of the barrel rod (327), the rear end of the core rod (328) is penetrated by the swing hole (330), and the rear side of the inner piston (325) is provided with a swing head (329) fixed to the rear end of the core rod (328).

4. A threaded sleeve locking tension control device according to claim 2, Features: The second thrust member comprises a locking cylinder (337) and a locking pin (338); The outer cylinder (323) is fixed with a locking cylinder (337), and a pressure chamber is arranged in the locking cylinder (337); A pressure piston is slidably matched in the pressure chamber, the pressure piston is fixed to the rear end of the locking pin (338), the front end of the locking pin (338) passes through the front end of the locking cylinder (337), and the locking pin (338) is slidably matched with the front end of the locking cylinder (337); A pressurizing hole is provided at the front end of the pressure chamber, and the pressurizing hole is connected to the pressure control device. A first return spring (351) is provided between the pressure piston and the locking cylinder (337), and the first return spring (351) pushes the front end of the locking pin (338) toward the outer teeth (347) of the annular locking gear (343).

5. A threaded sleeve locking tension control device according to claim 4, Features: The rear end of the locking cylinder (337) is butted against a hollow protrusion, the rear end of the protrusion is provided with a crossed deep groove (348) and a shallow groove (349), the rear end of the locking pin (338) extends outward from the hollow protrusion, and the rear end of the locking pin (338) is radially provided with a handle rod (350) adapted to the deep groove (348) or the shallow groove (349).

6. A threaded sleeve locking tension control device according to claim 4, Features: The first thrust member comprises a first hydraulic cylinder (321), the first hydraulic cylinder (321) is provided with a first liquid inlet hole (410), the first hydraulic cylinder (321) is fixed relative to the outer cylinder body (323), and the output end of the first hydraulic cylinder (321) is located inside the outer cylinder body (323) and points backwards to the front end of the inner cylinder body (324); The pressure chamber is a hydraulic chamber (340), and the pressure piston is a hydraulic piston (339); the pressurizing hole is a second liquid inlet hole (409), and the second liquid inlet hole (409) is located at the front end of the hydraulic chamber (340); the pressure control device includes an oil pressure piece, and the second liquid inlet hole (409) is connected to the oil pressure piece.

7. A threaded sleeve locking tension control device according to claim 6, Features: The pressure control device comprises a hydraulic control system, wherein the hydraulic control system comprises an oil pressure pump (561), a relief valve (564), a two-position three-way reversing valve (576) of a liquid circuit, a first liquid circuit on-off valve (531), a second liquid circuit on-off valve (532), a third liquid circuit on-off valve (533) and a fourth liquid circuit on-off valve (534); The oil return port (562) of the oil pressure pump (561) is connected to one end of the first liquid pipe (101), the other end of the first liquid pipe (101) is connected to one end of the second liquid pipe (102) through the first liquid circuit on-off valve (531), the other end of the second liquid pipe (102) is connected to one end of the third liquid pipe (103) through the second liquid circuit on-off valve (532), and the other end of the third liquid pipe (103) is connected to the first liquid inlet hole (410); The oil outlet (563) of the oil pressure pump (561) is in communication with one end of the fourth liquid pipe (104); One end of the fifth liquid pipe (105) is connected to the other end of the fourth liquid pipe (104) or one end of the sixth liquid pipe (106) through a two-position three-way reversing valve (576) of the liquid path; The other end of the sixth liquid pipe (106) is connected to one end of the seventh liquid pipe (107) through the fourth liquid path on-off valve (534), and the other end of the seventh liquid pipe (107) is connected to the first liquid pipe (101); The other end of the fifth liquid pipe (105) is connected to one end of the eighth liquid pipe (108) through the third liquid path on-off valve (533), and the other end of the eighth liquid pipe (108) is connected to the second liquid inlet hole (409); The second liquid pipe (102) and the fifth liquid pipe (105) are connected via a ninth liquid pipe (109), the first liquid pipe (101) and the fourth liquid pipe (104) are connected via a tenth liquid pipe (110), and the tenth liquid pipe (110) is provided with an overflow valve (564).

8. A threaded sleeve locking tension control device according to claim 7, Features: The invention comprises a display device, wherein the display device comprises a slide cylinder (301), a slide rod (306), a sliding piston (302) and an indicator plate (305); the sliding piston (302) is slidably matched in the slide cylinder (301); a spring clamping bead (308) is arranged on the side wall of the sliding piston (302); an annular clamping groove (309) for the spring clamping bead (308) to be clamped is arranged on the inner walls of both ends of the slide cylinder (301); one end of the slide rod (306) is fixed to the sliding piston (302); the other end of the slide rod (306) is slidably extended to the slide cylinder (301); The slide rod (306) outside the slide cylinder (301) is provided with the indicator plate (305); one end of the slide cylinder (301) close to the indicator plate (305) is provided with a first detection hole (304) connected to the slide cylinder (301); one end of the slide cylinder (301) away from the indicator plate (305) is provided with a second detection hole (303) connected to the slide cylinder (301); the first detection hole (304) is connected to the sixth liquid pipe (106), and the second detection hole (303) is connected to the third liquid pipe (103).

9. A threaded sleeve locking tension control device according to claim 4, Features: The first thrust member comprises a first air inlet hole (401) and a third air inlet hole (404), wherein the first air inlet hole (401) is arranged at the front end of the outer cylinder body (323), and the third air inlet hole (404) is arranged at the rear end of the outer cylinder body (323); The outer cylinder body (323) comprises a front section (331) and a rear section (332); the front end outer wall of the inner cylinder body (324) is provided with a front piston (334) which is slidably matched with the inner wall of the front section (331); the rear end outer wall of the inner cylinder body (324) is provided with a rear piston (333) which is slidably matched with the inner wall of the rear section (332).

10. A threaded sleeve locking tension control device according to claim 9, Features: A second ventilation hole (402) is provided in the middle of the front section (331); When the inner cylinder (324) slides to the front extreme position, the second air exchange hole (402) is separated from the first air inlet hole (401); When the inner cylinder (324) slides to the rear limit position, the second air exchange hole (402) is connected to the first air inlet hole (401); When the inner cylinder (324) slides between the front extreme position and the rear extreme position, either the second air exchange hole (402) is separated from the first air inlet hole (401), or the second air exchange hole (402) is connected to the first air inlet hole (401); The pressure chamber is a gas pressure chamber (342), and the pressure piston is a gas pressure piston (341); the pressurizing hole is a second air inlet hole (406), and the second air inlet hole (406) is located at the front end of the gas pressure chamber (342); a vent hole (408) is provided at the rear end of the gas pressure chamber (342), and a first air exchange hole (407) is provided in the middle of the gas pressure chamber (342); when the gas pressure piston (341) is located at the rear end of the gas pressure chamber (342), , the first ventilation hole (407) is connected to the second air inlet hole (406) through the locking cylinder (337), and the first ventilation hole (407) is disconnected from the ventilation hole (408); when the pneumatic piston (341) is located at the front end of the pneumatic chamber (342), the first ventilation hole (407) is connected to the ventilation hole (408) through the locking cylinder (337), and the first ventilation hole (407) is disconnected from the second air inlet hole (406).

11. A threaded sleeve locking tension control device according to claim 9, Features: The pressure control device includes an air pressure control system for intermittent air supply; A third ventilation hole (405) is provided at the front of the rear section (332); when the inner cylinder body (324) slides to the front extreme position, the third ventilation hole (405) is connected with the third air inlet hole (404); when the inner cylinder body (324) slides to the rear extreme position, the third ventilation hole (405) is separated from the third air inlet hole (404); The first air inlet hole (401) is connected to one end of the first air pipe (201), and the other end of the first air pipe (201) is connected to the atmosphere through the first air path on-off valve (511). The air hole of the first air path on-off valve (511) connected to the atmosphere is provided with a fourth shrinkage plug (554). One end of the first air path on-off valve (511) is provided with a first control end (361), and the other end of the first air path on-off valve (511) is provided with a second control end (362) and a second return spring (352). The first air pipe (201) is connected to the first control end (361), and the second control end (362) is connected to one end of the second air pipe (202). When only the first control end (361) has pressurized air, the first air path on-off valve (511) connects the first air pipe (201) to the atmosphere. In other cases, the first air path on-off valve (511) disconnects the first air pipe (201) from the atmosphere. The other end of the second air pipe (202) is connected to the atmosphere or one end of the third air pipe (203) through the first air circuit two-position three-way reversing valve (521). The first air circuit two-position three-way reversing valve (521) is provided with a third control end (363) and a third return spring (353). The third control end (363) is connected to one end of the twelfth air pipe (212). When the third control end (363) has pressurized air, the third control end (363) pushes the valve core to connect the second air pipe (202) with the atmosphere, and the second air pipe (202) is isolated from the third air pipe (203). When the third control end (363) has no pressurized air, the third return spring (353) pushes the valve core to connect the second air pipe (202) with the third air pipe (203). The three air pipes (203) are connected, and the second air pipe (202) is isolated from the atmosphere; the other end of the third air pipe (203) is connected to one end of the fourth air pipe (204) or one end of the fifth air pipe (205) through the second air circuit two-position three-way reversing valve (522); the second air circuit two-position three-way reversing valve (522) is provided with a fourth control end (364) and a fifth control end (365); the fourth control end (364) is connected to one end of the fourth air pipe (204), and the fifth control end (365) is connected to one end of the fifth air pipe (205); the fourth control end (364) and the fifth control end (365) have pressurized air, and the connected air pipes are connected to the other end of the third air pipe (203); The other end of the fourth air pipe (204) is connected to the atmosphere or one end of the sixth air pipe (206) through a first air path delayed two-position three-way reversing valve (541); the first air path delayed two-position three-way reversing valve (541) is provided with a sixth control end (366) and a fourth return spring (354); the sixth control end (366) is connected to one end of the sixth air pipe (206) through a first shrink plug (551); when the return force of the fourth return spring (354) is greater than that of the sixth control end (366), the return spring (354) is connected to the sixth control end (366). 6), the first air circuit delays the two-position three-way reversing valve (541) to connect the fourth air pipe (204) with the sixth air pipe (206), and the fourth air pipe (204) is disconnected from the atmosphere; when the thrust of the pressurized air at the sixth control end (366) is greater than the reset force of the fourth reset spring (354), the first air circuit delays the two-position three-way reversing valve (541) to disconnect the fourth air pipe (204) with the sixth air pipe (206), and the fourth air pipe (204) is connected to the atmosphere; The other end of the sixth air pipe (206) is connected to the atmosphere or one end of the seventh air pipe (207) through the third air path two-position three-way reversing valve (523), and the other end of the seventh air pipe (207) is connected to the first air cylinder (571); The first air cylinder (571) is connected to one end of an eighth air pipe (208), the other end of the eighth air pipe (208) is connected to a train pipe, and the eighth air pipe (208) is provided with a first check valve (565) that only allows gas to flow to the first air cylinder (571); The other end of the fifth air pipe (205) is connected to the atmosphere or one end of the ninth air pipe (209) through a second air circuit delayed two-position three-way reversing valve (542); the second air circuit delayed two-position three-way reversing valve (542) is provided with a seventh control end (367) and a fifth return spring (355); the seventh control end (367) is connected to one end of the ninth air pipe (209) through a second shrink plug (552); when the return force of the fifth return spring (355) is greater than that of the seventh control end (367), the seventh control end (367) is connected to one end of the ninth air pipe (209) through a second shrink plug (552). ), the second air circuit delays the two-position three-way reversing valve (542) to connect the fifth air pipe (205) with the ninth air pipe (209), and the fifth air pipe (205) is disconnected from the atmosphere; when the thrust of the pressurized air at the seventh control end (367) is greater than the reset force of the fifth reset spring (355), the second air circuit delays the two-position three-way reversing valve (542) to disconnect the fifth air pipe (205) with the ninth air pipe (209), and the fifth air pipe (205) is connected to the atmosphere; The other end of the ninth air pipe (209) is connected to one end of the tenth air pipe (210) or the atmosphere through the fourth air circuit two-position three-way reversing valve (524), and the other end of the tenth air pipe (210) is connected to the eighth air pipe (208). The third air circuit two-position three-way reversing valve (523) and the fourth air circuit two-position three-way reversing valve (524) share an eighth control end (368) and a sixth return spring (356). The eighth control end (368) is connected to the eighth air pipe (208) through the eleventh air pipe (211), and the eighth control end (368) is connected to the brake cylinder through a connecting pipe (250). The connecting pipe (250) and the eleventh air pipe (211) respectively and independently control the eighth control end (368). The first check valve (565) is located between the tenth air pipe (210) and the eleventh air pipe (211). When the thrust of the eighth control end (368) is greater than the reset force of the sixth reset spring (356), the eighth control end (368) pushes the valve core to disconnect the sixth air pipe (206) and the seventh air pipe (207), the sixth air pipe (206) is connected to the atmosphere, the ninth air pipe (209) is connected to the tenth air pipe (210), and the ninth air pipe (209) is disconnected from the atmosphere; when the thrust of the eighth control end (368) is less than the reset force of the sixth reset spring (356), the sixth reset spring (356) pushes the valve core to connect the sixth air pipe (206) and the seventh air pipe (207), the sixth air pipe (206) is disconnected from the atmosphere, the ninth air pipe (209) is disconnected from the tenth air pipe (210), and the ninth air pipe (209) is connected to the atmosphere; The other end of the twelfth air pipe (212) is connected to one end of the thirteenth air pipe (213) or one end of the fourteenth air pipe (214) through a fifth air circuit two-position three-way reversing valve (525); the fifth air circuit two-position three-way reversing valve (525) is provided with a ninth control end (369) and a tenth control end (370); the ninth control end (369) is connected to one end of the thirteenth air pipe (213); the other end of the thirteenth air pipe (213) is connected to the second air exchange hole (402); the tenth control end (370) is connected to one end of the fourteenth air pipe (214); the other end of the fourteenth air pipe is connected to the third air exchange hole (405); the ninth control end (369) and the tenth control end (370) have pressurized air, and the connected air pipes are connected to the other end of the twelfth air pipe (212); the twelfth air pipe (212) is provided with a third shrink plug (553); The first ventilation hole (407) is connected to one end of the fifteenth air pipe (215); the other end of the fifteenth air pipe (215) and the two ventilation holes are connected to one end of the sixteenth air pipe (216) or one end of the seventeenth air pipe (217) through the first two-position five-way reversing valve (568); the other end of the sixteenth air pipe (216) is connected to the first air pipe (201); the other end of the seventeenth air pipe (217) is connected to the third air inlet hole (404); the first two-position five-way reversing valve (568) is provided with an eleventh control end (371) and a twelfth control end (372); the eleventh control end (371) is connected to the eighteenth air pipe (218 ) is connected to the fifth air pipe (205), the twelfth control end (372) is connected to the fourth air pipe (204) through the nineteenth air pipe (219), when the eleventh control end (371) has pressurized air, the valve core is pushed to move, so that the fifteenth air pipe (215) is connected to the seventeenth air pipe (217), and the sixteenth air pipe (216) is connected to the atmosphere, when the twelfth control end (372) has pressurized air, the valve core is pushed in the reverse direction, so that the fifteenth air pipe (215) is connected to the sixteenth air pipe (216), and the seventeenth air pipe (217) is connected to the atmosphere, and the second air inlet (406) is connected to the second air pipe (202) through the twentieth air pipe (220).

12. A threaded sleeve locking tension control device according to claim 11, Features: The vent hole (408) is connected to one end of the thirty-ninth air pipe (239), and the other end of the thirty-ninth air pipe (239), the first exhaust hole (411), and the third exhaust hole (412) are connected to one end of the fortieth air pipe (240) or one end of the forty-first air pipe (241) through the second two-position five-way reversing valve (577); the second two-position five-way reversing valve (577) is provided with a sixteenth control end (376) and a seventeenth control end (377), the sixteenth control end (376) is connected to the fourteenth air pipe (214) through the forty-second air pipe (242), and the seventeenth control end (377) is connected to the forty-third air pipe (243). to the thirteenth air pipe (213); when the sixteenth control end (376) has pressurized air, the valve core is pushed to move, so that the thirty-ninth air pipe (239) is connected to the forty-first air pipe (241), and the fortieth air pipe (240) is connected to the first exhaust hole (411); when the seventeenth control end (377) has pressurized air, the valve core is pushed in the opposite direction, so that the thirty-ninth air pipe (239) is connected to the fortieth air pipe (240), and the forty-first air pipe (241) is connected to the third exhaust hole (412); the other end of the fortieth air pipe (240) is connected to the second detection hole (303), and the other end of the forty-first air pipe (241) is connected to the first detection hole (304).

13. A threaded sleeve locking tension control device according to claim 12, Features: The invention comprises a display device, wherein the display device comprises a slide cylinder (301), a slide rod (306), a sliding piston (302) and an indicator plate (305); the sliding piston (302) is slidably fitted in the slide cylinder (301); a spring clamping bead (308) is arranged on the side wall of the sliding piston (302); an annular clamping groove (309) for the spring clamping bead (308) to be clamped is arranged on the inner walls at both ends of the slide cylinder (301); one end of the slide rod (306) is fixed to the sliding piston (302); the other end of the slide rod (306) is slidably extended to the outside of the slide cylinder (301); the slide rod (306) outside the slide cylinder (301) is provided with the indicator plate (305); the slide rod (306) A first detection hole (304) connected to the slide cylinder (301) is provided at one end of the cylinder (301) close to the indicating plate (305), and a second detection hole (303) connected to the slide cylinder (301) is provided at one end of the slide cylinder (301) away from the indicating plate (305); longitudinal bypass grooves (307) for ventilation are respectively provided on the inner walls on both sides of the front and rear sides of the slide cylinder (301); when the sliding piston (302) slides to the front extreme position, the bypass groove (307) can connect the middle chamber of the slide cylinder (301) with the first detection hole (304); when the sliding piston (302) slides to the rear extreme position, the bypass groove (307) can connect the middle chamber of the slide cylinder (301) with the second detection hole (303).

14. A threaded sleeve locking tension control device according to claim 10, Features: Includes air pressure control system for continuous air supply; One end of the twenty-second air pipe (222) is connected to the third air inlet hole (404), the other end of the twenty-second air pipe (222) is connected to one end of the twenty-third air pipe (223) or the atmosphere through the seventh air circuit two-position three-way reversing valve (527), the other end of the twenty-third air pipe (223) is connected to the first air exchange hole (407) of the locking cylinder (337), the second air inlet hole (406) is connected to one end of the twenty-fourth air pipe (224), one end of the twenty-fifth air pipe (225) is connected to the other end of the twenty-fourth air pipe (224) or one end of the twenty-sixth air pipe (226) through the two-position four-way reversing valve (573), wherein when the twenty-fifth air pipe (225) is connected to the other end of the twenty-fourth air pipe (224), the twenty-sixth air pipe (226) is connected to the second end of the twenty-fifth air pipe (225). One end of the air pipe (226) is connected to the atmosphere; the twenty-fifth air pipe (225) is isolated from the twenty-fourth air pipe (224), and when it is connected to one end of the twenty-sixth air pipe (226), the passage between the twenty-sixth air pipe (226) and the atmosphere is isolated; the other end of the twenty-fifth air pipe (225) is connected to the second air cylinder (572), the second air cylinder (572) is connected to one end of the twenty-seventh air pipe (227), the other end of the twenty-seventh air pipe (227) is connected to one end of the twenty-eighth air pipe (228) through the second check valve (569), the second check valve (569) only allows gas to flow from the twenty-eighth air pipe (228) to the twenty-seventh air pipe (227), and the other end of the twenty-eighth air pipe (228) is connected to an external air source; One end of the thirty-seventh air pipe (237) is connected to the twenty-fourth air pipe (224), and the other end of the thirty-seventh air pipe (237) is connected to the atmosphere through the fourth air path on-off valve (514); One end of the thirty-second air pipe (232) is connected to the other end of the twenty-sixth air pipe (226) or the atmosphere through the eighth air circuit two-position three-way reversing valve (528); the air hole of the eighth air circuit two-position three-way reversing valve (528) connected to the atmosphere is provided with a sixth shrink plug (556); the other end of the thirty-second air pipe (232) is connected to the first air inlet (401); The eighth air path two-position three-way reversing valve (528) is provided with a thirteenth control end (373) and a seventh return spring (357). When the pressure air thrust of the thirteenth control end (373) is greater than the elastic force of the seventh return spring (357), the thirteenth control end (373) pushes the valve core to move and compress the seventh return spring (357), so that the thirty-second air pipe (232) is separated from the thirty-first air pipe (231), and the thirty-second air pipe (232) is connected to the atmosphere. When the pressure air thrust of the thirteenth control end (373) is less than the elastic force of the seventh return spring (357), the seventh return spring (357) pushes the valve core to move in the opposite direction, the thirty-second air pipe (232) is connected to the thirty-first air pipe (231), and the thirty-second air pipe (232) is disconnected from the atmosphere. The thirteenth control end (373) is connected to one end of the thirty-third air pipe (233), and the other end of the thirty-third air pipe (233) is connected to one end of the thirty-fourth air pipe (234) or the atmosphere through the sixth air path two-position three-way reversing valve (526). The thirty-third air pipe (233) is provided with a fifth shrink plug (555), and the other end of the thirty-fourth air pipe (234) is connected to the twenty-third air pipe (223); The fourth gas circuit on-off valve (514) and the sixth gas circuit two-position three-way reversing valve (526) share a fourteenth control end (374) and an eighth return spring (358); the fourteenth control end (374) is connected to one end of the thirty-fifth gas pipe (235), and the other end of the thirty-fifth gas pipe (235) is connected to the second air exchange hole (402); when there is pressurized air at the fourteenth control end (374), the fourteenth control end (374) pushes the valve core to move and compress the eighth return spring (358), the thirty-third air pipe (233) is connected to the thirty-fourth air pipe (234), the thirty-third air pipe (233) is disconnected from the atmosphere, and the thirty-seventh air pipe (237) is connected to the atmosphere; when there is no pressurized air at the fourteenth control end (374), the eighth return spring (358) pushes the valve core to move so that the thirty-third air pipe (233) is disconnected from the thirty-fourth air pipe (234), the thirty-third air pipe (233) is connected to the atmosphere, and the thirty-seventh air pipe (237) is isolated from the atmosphere; The two-position four-way reversing valve (573) and the seven-position three-way reversing valve (527) share a fifteenth control end (375) and a ninth return spring (359); the fifteenth control end (375) is connected to one end of the thirty-sixth air pipe (236), and the other end of the thirty-sixth air pipe (236) is connected to the twenty-eighth air pipe (228); when there is pressurized air at the fifteenth control end (375), the fifteenth control end (375) pushes the valve core to move and compress the ninth return spring (359), and the twenty-second air pipe (222) is connected to the twenty-third air pipe (223), and the twenty-second air pipe (222) is connected to the large When the air is disconnected from the 15th control end (375), the 25th air pipe (225) is connected to the 24th air pipe (224), and the 26th air pipe (226) is connected to the atmosphere; when there is no pressurized air at the 15th control end (375), the 9th return spring (359) pushes the valve core to move, the 22nd air pipe (222) is connected to the atmosphere, the 23rd air pipe (223) is disconnected from the 22nd air pipe (222), the 25th air pipe (225) is connected to the 26th air pipe (226), the 26th air pipe (226) is disconnected from the atmosphere, and the passage between the 24th air pipe (224) and the 25th air pipe (225) is disconnected; The air storage cylinder (575) is connected to the twenty-third air pipe (223) through the thirty-eighth air pipe (238).

15. A threaded sleeve locking tension control device according to claim 14, Features: The vent hole (408) is connected to one end of the forty-fourth air pipe (244), and one end of the forty-fifth air pipe (245) is connected to the other end of the forty-fourth air pipe (244) or the fourth exhaust hole (413) through the ninth air circuit two-position three-way reversing valve (529); the ninth air circuit two-position three-way reversing valve (529) is provided with an eighteenth control end (378) and a nineteenth control end (379), the eighteenth control end (378) is connected to the thirty-fifth air pipe (235) through the forty-ninth air pipe (249), and the nineteenth control end (379) is connected to one end of the forty-seventh air pipe (247); when the eighteenth control end (378) has pressurized air When the 19th control end (379) has pressurized air, the valve core is pushed to move so that the 44th air pipe (244) is connected to the 45th air pipe (245); when the 19th control end (379) has pressurized air, the valve core is pushed in the opposite direction so that the 45th air pipe (245) is connected to the fourth exhaust hole (413); the other end of the 45th air pipe (245) is connected to the second detection hole (303), the other end of the 47th air pipe (247) is connected to one end of the 46th air pipe (246) and one end of the 48th air pipe (248), the other end of the 46th air pipe (246) is connected to the 22nd air pipe (222), and the other end of the 48th air pipe (248) is connected to the first detection hole (304).

16. A threaded sleeve locking tension control device according to claim 15, Features: The invention comprises a display device, wherein the display device comprises a slide cylinder (301), a slide rod (306), a sliding piston (302) and an indicator plate (305); the sliding piston (302) is slidably matched in the slide cylinder (301); a spring clamping bead (308) is arranged on the side wall of the sliding piston (302); an annular clamping groove (309) for the spring clamping bead (308) to be clamped is arranged on the inner walls of both ends of the slide cylinder (301); one end of the slide rod (306) is fixed to the sliding piston (302); the other end of the slide rod (306) is slidably extended to the outside of the slide cylinder (301); the slide cylinder (30 1) The indicator plate (305) is arranged on the external sliding rod (306); a first detection hole (304) connected to the inside of the sliding cylinder (301) is arranged at one end of the sliding cylinder (301) close to the indicator plate (305); a second detection hole (303) connected to the inside of the sliding cylinder (301) is arranged at one end of the sliding cylinder (301) away from the indicator plate (305); a longitudinal bypass groove (307) for ventilation is arranged on the rear inner wall of the sliding cylinder (301); when the sliding piston (302) slides to the rear extreme position, the bypass groove (307) can connect the middle chamber of the sliding cylinder (301) with the first detection hole (304).

17. A threaded sleeve locking tension control device according to any one of claims 8, 13 and 16, Features: The display device comprises a detection switch (312), a light sensor (310), an indicator light (311) and a power supply (313); a contact rod is arranged at the other end of the sliding rod (306); the detection switch (312) is used to detect the position of the contact rod; the detection switch (312), the light sensor (310), the indicator light (311) and the power supply (313) form a series circuit.

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