364 results about "Shuttle valve" patented technology

The invention relates to the technical field of loader brake valves, and discloses a hydraulic brake valve and a hydraulic system thereof.The hydraulic brake valve comprises the hydraulic brake valve, the hydraulic brake valve is composed of a one-way valve, a brake valve set, a brake lamp pressure switch, a low-pressure alarm pressure switch, a shuttle valve, a high-low pressure unloading valve and a throttling hole, and the high-low pressure unloading valve and the throttling hole are integrated; a P port, an A port, a B port, a T port, an LS1 port, an LS port, a low-pressure alarm pressure switch and a brake lamp pressure switch are arranged outside the hydraulic brake valve. A liquid filling valve is omitted, an oil source of the full-hydraulic power braking system is taken from an existing priority valve CF port of equipment, pressure feedback signals are selected through a shuttle valve on a hydraulic braking valve, the pressure feedback signals are transmitted to the priority valve, and liquid filling and energy supplementing of the full-hydraulic power braking system or steering work of a steering system is achieved. The brake has the remarkable advantages of being fast in brake response, low in noise, low in failure rate, high in safety coefficient, compact in structure, low in cost and low in energy consumption.

A first output end of a two-way hydraulic pump is connected with one end of a second oil way, one end of a third oil way and one end of a first auxiliary oil way, the other end of the second oil way is connected with a left end connector of a shuttle valve, the second oil way is communicated with the third oil way, and a first hydraulic control one-way valve is installed in the third oil way; the other end of the third oil way is connected with a rodless cavity of the hydraulic cylinder, and the other end of the first auxiliary oil way is matched with one end of the second hydraulic control one-way valve. A second output end of the bidirectional hydraulic pump is connected with one end of a fourth oil way, one end of a fifth oil way and one end of a second auxiliary oil way, the other end of the fourth oil way is connected with a right end connector of the shuttle valve, the fourth oil way is communicated with the fifth oil way, a second hydraulic control one-way valve is installed in the fifth oil way, and the other end of the fifth oil way is connected with a rod cavity of the hydraulic cylinder. The other end of the second auxiliary oil way is matched with one end of the first hydraulic control one-way valve. According to the invention, the vehicle door can be automatically opened or closed.

A winch hydraulic control system includes a hydraulic oil tank, a hydraulic pump, and an electric motor. The hydraulic pump's oil inlet is connected to the hydraulic oil tank, the electric motor is connected to the hydraulic pump, and the hydraulic pump's oil outlet is connected to both port P of the main reversing valve assembly and port P of the control valve assembly. Ports A and B of the main reversing valve assembly are connected to port A of the first shuttle valve, port A of the balancing valve assembly, and port B of the control valve assembly, respectively. Port X is connected to port B of the second solenoid reversing valve. Ports B and C of the first shuttle valve are connected to port B of the balancing valve assembly and port B of the second shuttle valve, respectively. A third pressure reducing valve is connected in parallel with the second solenoid valve. Port P of the second solenoid reversing valve is connected to port X of the control valve assembly, port A of the second shuttle valve, and port SP of the balancing valve assembly. Port C of the second shuttle valve is connected to the rod chamber of the brake. The brake is connected to the hydraulic motor, and the oil outlet of the control valve assembly is connected to the oil inlet of the balancing valve assembly. This design can maintain constant wire rope tension and stable operation.

The invention discloses an unmanned mining dump truck hydraulic braking system and a control method. The unmanned mining dump truck hydraulic braking system comprises a service brake valve set and a parking brake valve set. The service brake valve group comprises a first hydraulic proportional pressure reducing valve, a second hydraulic proportional pressure reducing valve, a first shuttle valve and a first pressure sensor; the first hydraulic proportional pressure reducing valve and the second hydraulic proportional pressure reducing valve are connected in parallel; oil outlets of the first hydraulic proportional pressure reducing valve and the second hydraulic proportional pressure reducing valve are communicated with an oil inlet of a first shuttle valve; an oil outlet of the first shuttle valve is connected with a first pressure sensor; the parking brake valve group comprises an electromagnetic directional valve, a redundant electromagnetic directional valve and a pressure switch; the electromagnetic directional valve is a normally closed valve, and the redundant electromagnetic directional valve is a normally open valve; the electromagnetic directional valve and the redundant electromagnetic directional valve are connected in series, the electromagnetic directional valve is connected with an oil inlet pipeline, the redundant electromagnetic directional valve is connected with an oil outlet pipeline and a parking brake caliper, and a pressure switch is arranged on the oil outlet pipeline.

The utility model discloses a hydraulic valve group and system for controlling a power head to axially float along with threads, and relates to the technical field of hydraulic control, two oil inlets of a shuttle valve are arranged close to a third oil port and a fourth oil port and are respectively communicated with a first oil way and a second oil way, a port I of a two-position three-way manual valve is communicated with an oil drainage port, and a port II of the two-position three-way manual valve is communicated with an oil drainage port. When the two-position three-way manual valve keeps the spring position, a first port and a second port of the two-position three-way manual valve are communicated, pilot ports of the two hydraulic control one-way valve sets are connected in parallel and return oil through the first port of the two-position three-way manual valve, the two hydraulic control one-way valve sets are closed, and the two hydraulic control one-way valve sets return oil through the second port of the two-position three-way manual valve. When the two-position three-way manual valve is switched to the locking position, the third port and the second port of the two-position three-way manual valve are communicated, the pilot ports of the two hydraulic control one-way valve sets are both communicated with the second port of the two-position three-way manual valve, and the two hydraulic control one-way valve sets are opened. The service life of the power head main shaft and the drill rod can be prolonged.

The invention relates to the field of tire type walking equipment, and discloses a load-sensitive hydraulic brake valve and a load-sensitive hydraulic system thereof, and the load-sensitive hydraulic system comprises the load-sensitive hydraulic brake valve, a load-sensitive pump, a priority valve, a steering hydraulic system, a working hydraulic system, a shuttle valve and corresponding connecting pipelines; a P port, an A port, a B port, a T port, an LS1 port, an LS port, a low-pressure alarm pressure switch and a brake lamp pressure switch are arranged outside the load-sensitive hydraulic brake valve. According to the system, full-hydraulic dynamic braking can be achieved on equipment without a prefill valve, the equipment efficiency is improved, the installation cost is reduced, the energy consumption is reduced, and the service life is prolonged. Wherein the load-sensitive hydraulic brake valve integrates a brake function, a pressure maintaining function, a high-low pressure switching function, a pressure signal selection function and a pressure alarm function; the invention has the advantages of fast braking response, low noise, low failure rate, high safety coefficient, compact structure, low cost, low energy consumption and long service life.

The invention provides an impact rotary drilling hydraulic control system of a dinting machine, which belongs to the technical field of hydraulic control systems and comprises a variable pump, a pilot oil source control valve group, a proportional multi-way valve, a shuttle valve I, a one-way pressure reducing valve, a shuttle valve II, a drilling machine pilot handle group, an impact rotary drilling machine, a bidirectional hydraulic lock and a drilling machine feeding oil cylinder. According to the hydraulic control system for percussive rotary drilling of the dinting machine, the percussive rotary drilling machine can perform stepless speed regulation between two speeds, high-frequency percussive or low-frequency percussive operation can be flexibly used according to rock stratum and geological working conditions, the application range of equipment is greatly widened, and the hydraulic control system can be used for rock stratums with high hardness, weathered rock stratums and hard and brittle geology. And during low-frequency impact operation, one-key linkage operation can be realized, namely, the functions of feeding, rotating and impacting of the drilling machine can be completed by operating the impact pilot handle.

The utility model provides an unloading system which comprises a hydraulic pump station and a winch control system, the hydraulic pump station supplies oil to the winch control system, the winch control system drives a motor and a second motor to rotate, the winch control system comprises a first oil way and a second oil way, the first oil way drives the motor to rotate, and the second oil way drives the second motor to rotate. The second oil way drives the second motor to rotate; the first oil way comprises a first middle-position unloading valve and a first operating valve, the second oil way comprises a second middle-position unloading valve and a second operating valve, and a first unloading shuttle valve is arranged between the first oil way and the second oil way; according to the structure, when one winch needs to be started, unloading oil ways of the two winches are closed, and full-load operation of the winches can be conducted.

The utility model relates to a hydraulic system, in order to solve the problem that when an engine of an existing loader is started, an energy accumulator of a braking system is filled with liquid to increase the starting load of the engine, the hydraulic system of the loader comprises a liquid filling valve, a flow amplifying valve, a two-position three-way valve and a shuttle valve, an oil inlet of the prefill valve is connected with a CF port of a priority valve in the flow amplification valve; an oil inlet, an oil outlet and an oil return port of the two-position three-way valve are correspondingly connected with an S signal port of the prefill valve, a first oil inlet end of the shuttle valve and an oil tank loop, the oil outlet of the two-position three-way valve is selectively communicated with the oil inlet or the oil return port, and an LS1 signal port of the flow amplification valve is communicated with a second oil inlet end of the shuttle valve. And the oil outlet end of the shuttle valve is connected with a control signal port of the priority valve. The hydraulic system of the loader does not have a liquid filling load when the engine is started, and is easy to start.

The invention discloses a constant pressure and load sensitive switching hydraulic control system and method, and belongs to the technical field of hydraulic control, the constant pressure and load sensitive switching hydraulic control system comprises a power mechanism, a variable pump and an oil tank, the variable pump comprises a load sensitive valve, the load sensitive valve is connected with a shuttle valve outlet of a shuttle valve, and an electric proportional overflow valve is connected with the variable pump; the electric proportional overflow valve is further connected with a first inlet of the shuttle valve, a P port of the reversing valve is connected with the variable pump, and an A port of the reversing valve is connected with a second inlet of the shuttle valve; the pressure sensor assembly is used for reading the outlet pressure of the variable pump and transmitting the outlet pressure to the controller. The pressure sensor assembly is further used for reading the load-sensitive feedback pressure and transmitting the load-sensitive feedback pressure to the controller. Constant pressure and negative sensitive switching is automatically carried out along with increase of the load pressure, the load-sensitive system can be prevented from working under the low-pressure condition, and the problems that under the low-pressure condition, an execution element of the load-sensitive system is slow in action, and the system efficiency is low can be effectively solved.

The utility model discloses a TMTB high-voltage cycloid motor brake increasing device which comprises an output shaft and a shell, the output shaft rotationally penetrates through the middle of the shell, a connecting plate is connected to the side face of the shell, a rear shell is connected to the side face of the connecting plate, the output shaft is fixedly connected to a large connecting shaft, and the large connecting shaft is fixedly connected to the shell. The large connecting shaft is located in the shell, the connecting plate and the rear shell, the end of the large connecting shaft is connected with a small linkage shaft, the small linkage shaft is rotationally arranged in the rear shell, a rear partition plate is arranged between the rear shell and the stator and rotor pair, the rear partition plate is arranged on the outer side of the small linkage shaft in a sleeving mode, and a wet-type copper-based friction plate is adopted. The brake has the advantages that the belleville spring serves as a brake composition unit, the copper-based friction plate does not pollute the cleanliness of oil in the motor, the integrated shuttle valve is used in a matched mode, the brake can be released when the motor is started, synchronous braking is achieved when the motor stops running, the braking state during stopping can be effectively guaranteed, and safety and reliability are achieved.

The utility model discloses a tractor electric control lifter control system, which belongs to the technical field of tractor lifter control systems, and comprises a pressure compensation valve, a proportional reversing valve, a shuttle valve and a lifting oil cylinder, a system oil inlet is communicated with a first oil port of the proportional reversing valve, a second oil port of the proportional reversing valve is communicated with a rodless cavity of the lifting oil cylinder, and the pressure compensation valve is connected with the shuttle valve. A third oil port of the proportional reversing valve is communicated with a rod cavity of the lifting oil cylinder, and a fourth oil port of the proportional reversing valve is communicated with the oil return port; an oil inlet and a first control oil port of the pressure compensation valve are respectively communicated with a system oil inlet, an oil overflow port of the pressure compensation valve is communicated with a bypass oil port, two oil inlets of the shuttle valve are respectively communicated with a second oil port and a third oil port, and an oil outlet of the shuttle valve is communicated with a second control oil port of the pressure compensation valve. The pressure compensation valve can collect load pressure signals through the shuttle valve and can automatically adjust the flow input into a system according to the opening degree of the proportional reversing valve under various working conditions, and therefore energy waste is reduced.

The utility model discloses a double-stop-valve control structure which is characterized in that a stop valve block is arranged on a rear cover of an axial plunger closed type pump, an A-port working oil way stop valve is arranged in the stop valve block, and a B-port working oil way stop valve is arranged in the rear cover; oil drainage of the A-port working oil way stop valve and oil drainage of the B-port working oil way stop valve share one oil drainage channel, A-port working oil enters the A-port oil way stop valve through an A-port channel arranged in the rear cover, and B-port working oil enters the A-port oil way stop valve through a B-port channel arranged in the rear cover. Different cut-off pressures can be set for the working oil port A and the working oil port B of the hydraulic axial plunger closed type pump according to needs, and the hydraulic axial plunger closed type pump can cope with more complex working conditions. The oil port A and the oil port B can be independently adjusted more conveniently, meanwhile, the structure of the stop valve sleeve is optimized, the length is shortened, parts such as a shuttle valve and an ejector pin are omitted, cost is reduced, and convenience is created for manufacturing of the stop valve sleeve.

The invention belongs to the field of electro-hydrostatic actuators, and particularly relates to an electro-hydrostatic actuator structure with a high servo characteristic and a control method. Comprising a servo motor, a hydraulic pump, a hydraulic control one-way valve, a shuttle valve, an electromagnetic valve, a pressure sensor, an actuator cylinder and a controller. The servo motor is mechanically connected with the hydraulic pump, hydraulic control one-way valves are connected between the actuating cylinder and an oil inlet and outlet path of the hydraulic pump, and the pressure of remote control ports of the two hydraulic control one-way valves is switched through the two electromagnetic valves. The pressure sensors measure the pressure of the two cavities of the actuator cylinder and transmit the pressure to the controller. The two inlets of the shuttle valve are respectively communicated with the two cavities of the actuating cylinder to select the high-pressure side pressure in the oil cavity of the actuating cylinder; and the controller controls the rotating speed and the torque of the servo motor after receiving the position instruction, the motor state parameters and the data of the pressure sensor. According to the electro-hydrostatic actuator, the rotating speed overshoot of the hydraulic pump in the starting process can be reduced, and the servo characteristic of the electro-hydrostatic actuator is improved.

The invention discloses a dual-pump confluence load-sensitive valve group and a multi-way valve for engineering machinery, and provides a modular integrated design, the valve group comprises an oil inlet valve plate I, a confluence valve plate, a reversing valve plate and an oil inlet valve plate II, the oil inlet valve plate I is integrated with a priority valve core and an overflow valve, and oil return through a short path of the confluence valve plate during neutral-position unloading of an oil pump I is realized; a three-way flow adjusting valve is arranged in the second oil inlet valve plate and is in linkage with the shuttle valve through an LS2 / LS3 channel, and the oil supply state and the unloading state of the second oil pump are dynamically switched. The converging valve plate controls double-pump converging logic through the reversing valve rod, P1 and P2 converge to a working port A through a logic one-way valve under the lifting working condition, meanwhile, an LS2 channel feeds back load pressure to trigger a three-way valve to be closed and unloaded, and rapid large-flow response is achieved. The unloading oil way structure is optimized, the pressure loss path is shortened, the flow requirement is accurately matched in combination with load sensitive control, the meso-position unloading energy consumption is reduced, the problems of energy waste and response lag of a traditional system are solved, the energy efficiency of equipment is remarkably improved, and the service life of the equipment is remarkably prolonged.

The utility model provides a quick emergency control system for a hydraulic crane. The quick emergency control system comprises a manual pump, an oil cylinder, a lifting motor and a hydraulic rotary motor, the lifting motor is connected with the main valve through a winch control valve group; the winch control valve group comprises a first shuttle valve, a balance valve, a second hydraulic reversing valve, a one-way pressure reducing valve, a third hydraulic reversing valve, a second speed regulating valve, a second hydraulic control one-way valve, a second oil supplementing valve and a second shuttle valve; wherein the port A is connected with the port A1 through the second hydraulic reversing valve, the port B is connected with the port B1 through the balance valve, the first shuttle valve is arranged between the A-A1 oil way and the B-B1 oil way in parallel, and the middle position of the first shuttle valve is sequentially connected with the second shuttle valve, the second hydraulic reversing valve and the one-way pressure reducing valve; and an FL port is sequentially connected with a second oil supplementing valve, a second speed regulating valve and a third hydraulic reversing valve. According to the system, the high-efficiency control valve group is integrated and comprises a plurality of hydraulic reversing valves and speed regulating valves, so that the system can respond quickly, and the quick action of the lifting and rotary motor is realized.

The present invention belongs to the technical field of rail trains, and relates to a rail train hydraulic brake system slow-release device. The present invention also relates to a control method for a rail train hydraulic brake system slow-release device. A reversing valve module (A) includes a shuttle valve (1), a first pressure switch (2), and a second pressure switch (3). A manual pump module (B) includes a manual pump (4), an oil tank (5), and a pressure relief valve (6). The shuttle valve (1) is connected to the oil tank (5) through a first pipeline (7). A manual pump (4) is provided on the first pipeline (7). The shuttle valve (1) is connected to an auxiliary relief unit (9) through a second pipeline (8). The shuttle valve (1) is connected to a clamp (11) through a third pipeline (10). The first pipeline (7) is connected to the pressure relief valve (6). The rail train hydraulic brake system slow-release device of the present invention is easy to operate, can reliably complete relief and braking, effectively prevents the risks caused by misoperation and forgetting to restore the gear position, and reduces the probability of misactivation.

An actuation assembly is provided herein that may include a pilot operated shuttle valve. The shuttle valve may rotate a rotation portion of the actuation assembly. When the rotation portion is rotated, different output sources may be opened and / or closed. The shuttle valve may include a shuttle may open and / or close a plurality of outputs. The shuttle may be attached to a plurality of springs, one of which may extend and / or compress based on temperature. When extended and / or compressed, the shuttle may translate within a shuttle pathway to open and / or close the plurality of outputs.

A closed, gravity-fed burette for intravenous (IV) fluid delivery and flush system supporting multiple input combinations for simplicity and standardization. Able to handle both hazardous and non-hazardous drugs, this system may incorporate plastic and elastomeric materials that are resistant to the effects of antineoplastic materials in conjunction with a hazardous air filter module while still integration compatible with electronic peristaltic pumps for finer control of flow rate and when the IV infusion recipient's physical position is not compatible with a gravity-fed flow. The buoyant-activated shuttle valve enables the AutoStart function providing steady flush of the IV line to the patient for optimized vein patency from the Primary IV fluid feed. This Primary line works in conjunction with a Secondary IV fluid feed and a needleless connector Drug Port for multiple feed and flush conditions directed by way of a monoblock design supporting combinations of rotary, toggle, and check valves.

The utility model relates to the technical field of hydraulic systems, in particular to an oil return compensation multi-way output hydraulic system for a tractor and the tractor, the input end of a main pump is communicated with a hydraulic oil tank, the output end of the main pump is connected with a port P of a multi-way output valve through a pipeline, and a plurality of valve assemblies are arranged in the multi-way output valve; the valve assembly is connected with a pressure feedback channel of the multi-way output valve through a shuttle valve, an oil return opening of the valve assembly is connected with an oil inlet of the pressure compensation valve through a pipeline, an oil return opening of the pressure compensation valve is communicated with the hydraulic oil tank through an oil return pipe, and an oil outlet of the shuttle valve conveys screened load pressure to a non-spring side control cavity of the pressure compensation valve. A load sensitive oil port of the valve assembly is connected with a spring side control cavity of the pressure compensation valve through a load feedback oil way. According to the utility model, multiple loads can work at the same time, and the opening of the pressure compensation valve is reduced through the screening of the shuttle valve, so that the balance of each load is obtained, and the adaptability, comfort and safety of the tractor and an executive component are higher.

The invention belongs to the technical field of engineering machinery, and discloses a brake hydraulic system and engineering machinery. According to the brake hydraulic system, service braking is adopted, reliable braking force can be provided, the two service brake valves and the electric proportional brake valve are connected in parallel, the path with the largest oil pressure is supplied to the service brake oil cylinder after judgment is conducted through the first shuttle valve and the second shuttle valve, and the service brake oil cylinder is connected with the electric proportional brake valve. Automatic signals and active operation of a driver can be perfectly coordinated, conflicts are avoided, and the system is simple and high in reliability.

The application discloses a multi-stage priority liquid filling valve and belongs to the technical field of hydraulic control valves of engineering vehicles.The valve adopts a modularized superposition structure, is composed of a liquid filling valve part and a steering priority valve part which are superposed upward and downward, is communicated through three internal oil channels, integrates a main overflow valve, a steering priority valve, a liquid filling priority valve, a liquid filling pressure regulating valve, a throttling check valve and a shuttle valve, realizes three-stage hydraulic oil supply control of steering highest priority, brake liquid filling secondary priority and working system lowest priority, and is provided with the main overflow valve at an oil inlet to realize system overpressure protection.The problems of complex priority control, incompatible load sensing and constant flow systems of valve parts, need of external main overflow valve, low universality, high development and use costs and the like are solved when a single pump source supplies oil to three or more systems.

Various aspects of the subject disclosure relate to a compounder system having a cartridge that includes fluid pathways controllable by valves of the cartridge. A pump component within the cartridge is actuable to move fluid through the controllable fluid pathways. The cartridge includes a needle extending from a cartridge body and fluidly coupled to at least one of the controllable fluid pathways. A vial puck is provided for attachment to a vial to be fluidly coupled to the cartridge by the needle. The vial puck may include a hydroscopic member to absorb fluid from the needle to ensure a dry disconnect. A shuttle valve may also be provided.

The present invention discloses a continuous flow amplifier, which includes a first reversing valve, a first shuttle valve, a flow amplification cylinder and an oil supply circuit; a hydraulic cylinder is also disclosed, which includes a hydraulic cylinder, a pressure oil supply device and the continuous flow amplifier in the above. The beneficial effects achieved by the present invention: It has the advantages of good sealing performance, reduces the leakage of hydraulic oil, has small overall energy loss, effectively reduces energy consumption, improves the sealing performance, can select hydraulic system components with a lower sealing grade and lower price, thereby can further reduce the manufacturing cost, reduces the probability of failure, and further improves the reliability. It realizes a variety of different working states, can adapt to different working states, meets different usage requirements, and plays a role in improving the applicability and production efficiency. It realizes the effect of increasing the output flow, and achieves the advantages of high efficiency, good sealing performance, stable reliability and low cost.

The application discloses a hydraulic valve group, system and method for controlling axial floating of a power head with threads, relates to the technical field of hydraulic control, and discloses the following technical scheme: two oil inlets of a shuttle valve are arranged close to a third oil port and a fourth oil port and are connected with a first oil path and a second oil path respectively; a port one of a two-position three-way manual valve is connected with a drain port; an oil outlet of the shuttle valve is connected with a port three of the two-position three-way manual valve; when the two-position three-way manual valve is kept in a spring position, the port one and the port two of the two-position three-way manual valve are connected, and pilot ports of two sets of hydraulic control check valve groups are connected in parallel and return oil through the port one of the two-position three-way manual valve; the two sets of hydraulic control check valve groups are closed; when the two-position three-way manual valve is switched to a locking position, the port three and the port two of the two-position three-way manual valve are connected, the pilot ports of the two sets of hydraulic control check valve groups are connected with the port two of the two-position three-way manual valve, and the two sets of hydraulic control check valve groups are opened. The application can prolong the service life of a main shaft of a power head and a drill pipe.

The present invention discloses an electronically controlled lifting system for driverless vehicles. In the present invention, a manual lifting valve is connected to the P ports of two proportional solenoid valves, and pilot working hydraulic oil is input from here; the manual lifting valve is connected to the T ports of the two proportional solenoid valves and is connected to the hydraulic oil tank; the 1 port and the 2 port of the manual lifting valve are respectively connected to the 1 ports of two shuttle valves; the A ports of the two proportional solenoid valves are respectively connected to the 2 ports of the two shuttle valves; the oil inlet of the lifting directional valve is connected to the lifting pump, and the oil return port is connected to the hydraulic oil tank; the present invention only needs to control two proportional valves, solving the problem of non-linear pressure output. Two shuttle valves are integrated into the hydraulic valve block, reducing the number of switching valves, making the system simpler, more reliable and easier to transform; in particular, the working paths of the proportional solenoid valves and the proportional solenoid valves are respectively connected to the 1 port and the 2 port of the shuttle valve. When they work respectively, the working oil flows out through the 3 port to the lifting directional valve, and they do not affect each other at the same time.

The utility model relates to the technical field of valves, in particular to a pneumatic reversing shuttle valve which comprises a main valve body, an auxiliary valve body and a cylinder body, the auxiliary valve body is detachably installed on the main valve body, and a material cavity used for arranging a piston shaft is arranged between the interior of the auxiliary valve body and the interior of the main valve body in a surrounding mode. The cylinder body is detachably installed on the secondary valve body, a piston cavity used for installing a piston is formed in the cylinder body, the piston shaft extends to one end of the piston cavity to be connected with the piston, and the main valve body comprises a material inlet D and a material outlet E which are communicated with the material cavity. The secondary valve body comprises a material outlet C communicated with the material cavity and a compressed air inlet B communicated with the piston cavity, and the cylinder body comprises a compressed air inlet A communicated with the piston cavity of the cylinder body. By applying the pneumatic reversing shuttle valve, multi-direction fast switching of the material flow direction can be achieved, and the pneumatic reversing shuttle valve has the advantages of being small in size, convenient to use, good in air tightness and the like.

The present invention discloses a hydraulic control valve for the integral telescopic mechanism of a roadheader, which comprises a main valve body. The oil inlets A - D of the main valve body 1 are respectively connected to the inlets of the first - fourth one - way valves. The outlets of the first - fourth one - way valves are all communicated with the second hydraulic control reversing valve. The other port of the second hydraulic control reversing valve is communicated with the oil outlet E, the oil inlet of the first overflow valve, and the closed end of the hydraulic control one - way valve. The opening end of the hydraulic control one - way valve is communicated with the oil inlet of the second overflow valve, and the control port is communicated with the control port G of the main valve body. The first shuttle valve is respectively connected between the oil inlet A of the main valve body and the first one - way valve, and between the oil inlet B and the second one - way valve. The third shuttle valve is respectively connected between the oil inlet C of the main valve body and the third one - way valve, and between the oil inlet D and the fourth one - way valve. The second shuttle valve is respectively connected to the outlets of the first shuttle valve and the third shuttle valve. The outlet of the second shuttle valve is communicated with the oil inlet of the sequence valve. The outlet of the sequence valve is communicated with the control port of the first hydraulic control reversing valve and the control port of the second hydraulic control reversing valve. The X1 port of the first hydraulic control reversing valve is communicated with the oil inlet F1 of the main valve body, the X2 port is communicated with the oil outlet F2 of the main valve body, and the X3 port is communicated with the drain port of the sequence valve, the outlet of the first overflow valve, the outlet of the second overflow valve, and the drain port T of the main valve body. The hydraulic control valve for the integral telescopic mechanism of the roadheader of the present invention can realize the high - degree integration of the hydraulic system, save space, simplify operation, and reduce the failure rate.

The application discloses a hydraulic leveling device, a hydraulic leveling method and an aerial work platform, and relates to the field of hydraulic control. The device comprises an electromagnetic reversing valve, a first bidirectional balance valve, a second bidirectional balance valve, a first leveling oil cylinder, a second leveling oil cylinder, a controller, a shuttle valve, a first electromagnetic unloading valve and a first pressure sensor. The first port and the second port of the shuttle valve are connected with the second port and the third port of the second bidirectional balance valve respectively, and the third port of the shuttle valve is connected with an oil return tank through the first electromagnetic unloading valve. The first pressure sensor is arranged on a pipeline between the shuttle valve and the first electromagnetic unloading valve and is used for detecting the first pressure in the pipeline. The controller is used for controlling the first electromagnetic unloading valve to be electrified or deenergized according to the first pressure when the initial state of the working platform is an inclined state during the start of the luffing operation. The application avoids the problem that the high pressure between the first leveling oil cylinder and the second leveling oil cylinder causes the damage of structural members.

The invention discloses a dual-mode redundancy brake-by-wire system, and relates to the technical field of vehicle braking and safety control. The dual-mode redundancy brake-by-wire system is characterized in that the oil outlet end of an oil supply pipeline is communicated with a first reversing valve; a control oil path of the driving pressure control mechanism comprises a first pressure control oil path and a second pressure control oil path, a proportional pressure reducing valve is arranged on the first pressure control oil path, and an oil outlet end of the first pressure control oil path is communicated to an oil inlet of a shuttle valve and is communicated to a corresponding driving brake through the shuttle valve; the second pressure control oil way is provided with an oil inlet pipeline and an oil drainage pipeline, an oil inlet switch valve is arranged on the oil inlet pipeline, an oil return switch valve is arranged on the oil drainage pipeline, and the oil inlet end of the oil drainage pipeline and the oil outlet end of the oil inlet pipeline are connected to the other oil inlet of the shuttle valve in parallel and communicated to the corresponding service brake through the shuttle valve. The device is used for braking and ABS sliding control under the working conditions of low attachment, heavy load and the like in an underground coal mine, and it is guaranteed that fault operation can be achieved, and safety and reliability are achieved.