A safety control system for explosion-proof vehicles with operating mechanisms to prevent them from slipping

Abstract

The invention belongs to the technical field of safety control of explosion-proof vehicles, and specifically relates to a safety control system for preventing an explosion-proof vehicle from slipping with an operating mechanism; the system comprises an air source, a manual reversing valve, a hydraulically controlled air reversing valve, a pneumatically controlled safety device, a parking brake, an operating mechanism control system and a traveling mechanism brake control system; the air source is divided into three paths after passing through ports I and III of the manual reversing valve, the first path reaches a starting system, the second path reaches the pneumatically controlled safety device after passing through ports I and III of the hydraulically controlled air reversing valve, and the third path is used to control the on-off of a diesel engine starting circuit; the pneumatically controlled safety device is connected to a control port k of the air-controlled reversing valve in a traveling mechanism brake control system; the control port k of the hydraulically controlled air reversing valve is connected to an oil circuit in a traveling mechanism control system; the system can be applied to all explosion-proof vehicles with operating mechanisms of mining explosion-proof diesel engines, to increase the reliability and safety of vehicle operation, and to realize automatic parking brake implementation in various vehicle working conditions.

Description

Technical Field

[0001] The invention belongs to the technical field of safety control of explosion-proof vehicles, and in particular relates to a safety control system for an explosion-proof vehicle with an operating mechanism to prevent the vehicle from slipping. Background Art

[0002] As the demand for explosion-proof vehicles in underground coal mines increases, the types of explosion-proof vehicles are becoming more and more abundant. Different mines have proposed the requirement to add operating mechanisms to explosion-proof vehicles, making the functions of explosion-proof vehicles more and more extensible. Especially for articulated vehicles, the operating mechanism is installed on the rear frame. In actual use, it is required that the vehicle driving and the operating mechanism be interlocked, that is, when the mechanism is in motion, the vehicle is in the parking state. On the other hand, when the vehicle is running, the mechanism cannot be moved. Under normal circumstances, when the vehicle switches from the driving state to the operating state, the vehicle automatically implements the parking brake. To ensure safety, the parking brake should be manually implemented; when switching to the vehicle driving state, the parking brake should be manually released before the vehicle drives. However, there is a situation where, when switching to the operating state, the vehicle automatically implements the parking brake, but the driver does not manually implement the parking brake. When the operating mechanism is completed, the vehicle needs to move and switches to the driving state. When the vehicle is on a slope or the vehicle gear is in neutral, the vehicle will slip. In order to solve this problem, a safety control device for explosion-proof vehicles with operating mechanisms under such extreme working conditions was invented to ensure that under such working conditions or under any working conditions, when switching from the operating state to the driving state, the vehicle can be parked regardless of whether the driver operates the manual parking function, and the device must be manually released before the vehicle drives away, thus avoiding the phenomenon of explosion-proof vehicles with operating mechanisms slipping under special circumstances and ensuring the safety performance of the vehicle. Summary of the invention

[0003] The invention aims to solve the problem that an explosion-proof vehicle with an operating mechanism may slip under special circumstances.

[0004] The present invention provides the following technical solutions: a safety control system for an explosion-proof vehicle with an operating mechanism to prevent the vehicle from slipping, comprising an air source, a manual reversing valve, a hydraulically controlled air reversing valve, a pneumatic control safety device, a parking brake, an operating mechanism control system and a walking mechanism brake control system;

[0005] The gas source is divided into three paths after passing through ports Ⅰ and Ⅲ of the manual reversing valve. The first path reaches the starting system, the second path reaches the pneumatic control safety device after passing through ports Ⅰ and Ⅲ of the hydraulic-controlled gas reversing valve, and the third path is used to control the on-off of the diesel engine starting circuit.

[0006] The pneumatic control safety device is connected to the control port k of the pneumatic control reversing valve in the walking mechanism brake control system;

[0007] The control port k of the hydraulically controlled gas reversing valve is connected to the oil circuit in the operating mechanism control system;

[0008] The manual reversing valve is in the upper position, port Ⅰ is connected to port Ⅲ, the starting system works, the diesel engine starting circuit is open, and the pneumatic control safety device is in the passage, so that the pneumatic control reversing valve is switched to connect port A to port P, and the parking brake is released;

[0009] The manual reversing valve is in the lower position, port III is connected to port II, the starting system is shut down, the diesel engine starting circuit is shut down, the pneumatic control safety device is depressurized and reset, so that the pneumatic control reversing valve is switched to port A and port T are connected, and the parking brake is applied;

[0010] When the operating mechanism control system controls the operation of the operating mechanism, it synchronously controls the reversing of the hydraulic-controlled air-controlled reversing valve. Port Ⅰ of the hydraulic-controlled air-controlled reversing valve is sealed, and ports Ⅲ and Ⅱ are connected to the atmosphere. The pneumatic control safety device releases pressure and resets to connect port A of the air-controlled reversing valve to port T, and the parking brake is applied.

[0011] Further, the pneumatic control safety device includes a valve body, a valve core, a connecting rod and an upper cover plate;

[0012] The valve core is inserted into the valve body, a sealed space is formed between the bottom of the valve core and the valve body, the upper cover is fixed to the valve body by screws, a compression spring is installed between the upper cover and the valve core, and the connecting rod passes through the upper cover and is connected to the valve core;

[0013] The valve body is provided with threaded mounting holes Ⅰ, Ⅱ and Ⅲ which are connected inside and outside. The threaded mounting hole Ⅱ is connected with the sealing space at the bottom of the valve core through the flow channel on the valve body; the threaded mounting hole Ⅰ is connected with the hydraulic-controlled air reversing valve, the threaded mounting hole Ⅱ is connected with the air-controlled reversing valve, and the threaded mounting hole Ⅲ is connected with the atmosphere;

[0014] O-ring I, O-ring II and O-ring III are installed between the valve core and the valve body, and an annular groove is provided between the O-ring II and the O-ring III.

[0015] When the valve core is in the first position, the compression spring is compressed, and high-pressure air enters from the threaded mounting hole Ⅰ. The threaded mounting hole Ⅰ and the threaded mounting hole Ⅱ are connected through the annular groove. The compressed air acts on the bottom of the valve core to keep the valve core in the first position; the control port k of the air-controlled reversing valve is connected to the compressed air;

[0016] The valve core is in the second position, the threaded mounting hole II is connected with the threaded mounting hole III through the annular groove, the compressed air at the bottom of the valve core is exhausted through the threaded mounting hole III to release the pressure, the threaded mounting hole I and the threaded mounting hole II are disconnected, and the compression spring pushes the valve core to remain in the second position; the control port k of the air-controlled reversing valve is disconnected from the compressed air.

[0017] Further, the walking mechanism brake control system includes a gear pump, a manual reversing valve, an accumulator, a hydraulically controlled reversing valve, a pneumatically controlled reversing valve, a manual parking valve and a parking brake;

[0018] The gear pump is installed on the diesel engine and connected to the fuel tank to provide pressure oil for the travel mechanism brake control system. The pressure port of the gear pump is connected to the P port of the manual reversing valve, and the A port of the manual reversing valve is connected to the accumulator and the travel system respectively; the accumulator is connected to the P port of the hydraulic control reversing valve, and the A port of the hydraulic control reversing valve is connected to the P port and T port of the air control reversing valve and then connected back to the fuel tank; the A port of the air control reversing valve is connected to the P port and T port of the manual parking valve and then connected back to the fuel tank; the A port of the manual parking valve is connected to the piston chamber of the parking brake and then to the T port and then connected back to the fuel tank;

[0019] The operating mechanism control system includes an operating mechanism. Port B of the manual reversing valve is connected to the operating mechanism and the throttle valve. It is divided into two paths after the throttle valve. One path goes to port Z of the hydraulically controlled reversing valve, so that the hydraulically controlled reversing valve is switched to port P and blocked, and port A is connected to port T; the other path reaches the control port k of the hydraulically controlled gas reversing valve after being reduced in pressure by the relief valve, so that the hydraulically controlled gas reversing valve is switched to port I and sealed, and ports III and II are connected to the atmosphere.

[0020] Furthermore, the diesel engine starting circuit includes an air swing motor, an electric switch and an ECU; the output shaft of the air swing motor is connected to the electric switch handle of the electric switch via a torsion spring, the air swing motor rotates to open the electric switch, and after the air swing motor is depressurized, the electric switch handle is reset under the action of the torsion spring, and the electric switch is powered off.

[0021] Furthermore, one end of the connecting rod is connected to the handle head through a thread and fixed by a top screw, and the other end is connected to the valve core through a thread.

[0022] Furthermore, the threaded mounting hole II is connected to the bottom of the valve core through the small holes I and II, and the small holes I and II are blocked by the plug II and the plug I respectively.

[0023] Furthermore, a safety valve I is arranged between the traveling mechanism and the oil tank, and the pressure of the traveling mechanism is set by the safety valve I.

[0024] Furthermore, a safety valve II is provided between the operating mechanism and the oil tank, and the pressure of the operating mechanism is set by the safety valve II.

[0025] Compared with the prior art, the advantages of the present invention are:

[0026] 1. When an explosion-proof vehicle with an operating mechanism is moving, the operating mechanism cannot be operated, and the vehicle is in a parked state when the operating mechanism is in operation.

[0027] 2. During the switching process between the two states, the air-controlled reversing valve and the hydraulic-controlled air-controlled reversing valve are used for bidirectional locking to keep the vehicle in a safe state and prevent the vehicle from slipping due to driver negligence.

[0028] 3. The pneumatic control safety device cleverly applies the principle of force balance between compressed air and spring, so that the valve core automatically closes when there is no air pressure. When restarting, the handle of the pneumatic control safety device must be lifted manually.

[0029] 4. The electric switch uses the combined action of the air swing motor and the torsion spring. When there is air, the switch is turned on. When there is no air, the torsion spring turns off the power and the vehicle is turned off. After the vehicle is turned off, the vehicle is automatically parked. Even if the manual parking valve is not manually turned to the parking position, after the vehicle is restarted, the pneumatic control safety device is also in the lower position, and the vehicle is in the parking state. There will be no slipping caused by negligence of not pulling the parking brake. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the safety control system for an explosion-proof vehicle with an operating mechanism to prevent the vehicle from slipping;

[0031] Figure 2 This is a schematic diagram of the pneumatic control safety device in the pulled-up state;

[0032] Figure 3 Take a status diagram of the pneumatic control safety device.

[0033] In the figure: 1-gear pump; 2-safety valve Ⅰ; 3-manual reversing valve; 4-safety valve Ⅱ; 5-operating mechanism; 6-travel mechanism; 7-throttle valve; 8-accumulator; 9-hydraulic reversing valve; 10-pneumatic reversing valve; 11-parking brake; 12-pneumatic control safety device; 13-relief valve; 14-handle head; 15-connecting rod; 16-thrust screw; 17-upper cover; 18-mounting hole; 19-compression spring; 20-O-ring Ⅰ; 21-O-ring Ring II; 22-O-ring III; 23-sealing pad; 24-pressure cover; 25-plug I; 26-small hole I; 27-plug II; 28-small hole II; 29-valve core; 30-valve body; 31-screw; 32-hydraulic air reversing valve; 33-manual reversing valve; 34-air swing motor; 35-torsion spring; 36-electric switch; 37-air source; 38-starting system; 39-explosion-proof diesel engine; 40-ECU; 41-electric switch handle; 42-manual parking valve. DETAILED DESCRIPTION

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] like Figure 1As shown: a safety control system for explosion-proof vehicles with operating mechanisms to prevent skidding. Before starting the vehicle, the manual reversing valve 33 is first turned to the open position. The air source 37 passes through the ports Ⅰ and Ⅲ of the manual reversing valve 33 and is divided into three paths. One path reaches the starting system 38; the other path passes through the ports Ⅰ and Ⅲ of the hydraulic control air reversing valve 32 and reaches the threaded mounting hole Ⅰ of the pneumatic control safety device 12. The device is in the state of being ... Figure 2 In the position shown, the threaded mounting hole I and the threaded mounting hole II are connected to reach the k port of the air-controlled reversing valve 10, so that the air-controlled reversing valve 10 is in the upper position; the third path reaches the entrance of the air swing motor 34, drives the air swing motor 34 to rotate, and the output shaft of the air swing motor 34 is connected to the electric switch handle 41 of the electric switch 36 through the torsion spring 35, rotates to open the electric switch 36, and the power of the power box is input to the ECU40 through the electric switch 36, and the diesel engine 39 is controlled to work normally after starting. When the engine is turned off, the manual reversing valve 33 is turned to the closed position, that is, the valve is in the lower position, the I port of the manual reversing valve 33 is sealed, and the III port is connected to the II port, and the pressure is released by the atmosphere. At this time, the compressed air of the air swing motor 34 is discharged to the atmosphere through the III port and the II port of the manual reversing valve 33 to release the pressure, and the electric switch handle 41 of the electric switch 36 is reset under the action of the torsion spring 35, the electric switch 36 is powered off, the ECU40 is powered off, and the vehicle is turned off.

[0036] After the vehicle is turned off, the compressed air in the threaded mounting holes II and I of the pneumatic control safety device 12 is released to the atmosphere through ports III and II of the manual reversing valve 33, and the high pressure under the valve core of the pneumatic control safety device 12 is released. The valve core 29 moves downward under the action of the compression spring 19, and the control port k of the pneumatic control reversing valve 10 is pressure-free. The pneumatic control reversing valve 10 is reversing to the lower position, and ports A and T are connected back to the oil tank. The high-pressure oil in the parking brake 11 is unloaded and is in the parking state under the action of the spring. At this time, even if the driver neglects to pull the manual brake valve 42 to the parking position, the vehicle is automatically in the parking state. After restarting, the pneumatic control safety device 12 must be pulled up to release the brake and the vehicle can drive normally.

[0037] The hydraulic power source of the explosion-proof vehicle is provided by the gear pump 1, which is installed on the explosion-proof diesel engine. When the vehicle is working, the starting position of the manual reversing valve 3 is the traveling mechanism side, and the pressure of the traveling mechanism is set by the safety valve Ⅰ2. The high-pressure oil at the pressure port of the gear pump 1 passes through the P port and the A port of the manual reversing valve 3 to fill the accumulator 8. The oil in the accumulator 8 passes through the P port and the A port of the hydraulic control reversing valve 9 and the P port and the A port of the air control reversing valve 10, and the P port and the A port of the manual parking valve 42, and then enters the piston chamber of the parking brake 11, pushing the spring to act and release the brake. The traveling mechanism can work normally.

[0038] When the operating mechanism needs to be moved, first operate the manual reversing valve 3 to the operating mechanism action position, i.e. the right position, with ports P and B connected, and operate the manual parking valve 42 to the parking position, i.e. the lower position, i.e. port P is blocked, and ports A and T are connected. At this time, the high-pressure oil from the gear pump 1 passes through ports P and B of the manual reversing valve 3, one way to the operating mechanism 5, and one way to the throttle valve 7. After the throttle valve 7, it is divided into two ways, one way to the Z port of the hydraulic control reversing valve 9, so that the hydraulic control reversing valve 9 is switched to the upper position, i.e. port P is blocked, port A is connected to port T, and the high-pressure oil in the parking brake 11 can be unloaded through the hydraulic control reversing valve 9, and the parking brake 11 is in the parking brake position under the action of the spring. The function of automatic parking of the vehicle when the operating mechanism is in action is realized.

[0039] The other way after the throttle valve 7 is decompressed through the relief valve 13 and reaches the control port k of the hydraulic-controlled air reversing valve 32, pushing the hydraulic-controlled air reversing valve 32 to switch to the lower position, that is, port I is sealed, and ports III and II are connected to the atmosphere. The threaded mounting hole II of the pneumatic control safety device 12 and the threaded mounting hole I are connected to the atmosphere through ports III and II of the hydraulic-controlled air reversing valve 32. At the same time, the control port k of the air-controlled reversing valve 10 is also connected to the atmosphere. The air-controlled reversing valve 10 is switched to the lower position, that is, port P is sealed, ports A and T are connected back to the oil tank, and the high-pressure oil of the parking brake 11 can also be unloaded through the air-controlled reversing valve 10, and the vehicle is in a parking state.

[0040] The pneumatic control safety device (12) comprises a valve body (30), a valve core (29), a connecting rod (15) and an upper cover plate (17); the valve core (29) is inserted into the valve body (30), a sealed space is formed between the bottom of the valve core (29) and the valve body (30), the upper cover plate (17) is fixed to the valve body (30) by screws (31), a compression spring (19) is installed between the upper cover plate (17) and the valve core (29), and the connecting rod (15) passes through the upper cover plate (17) and is connected to the valve core (29); the valve body (3 0) is provided with threaded mounting holes I, II and III which are connected to the inside and outside. The threaded mounting hole II is connected to the sealing space at the bottom of the valve core (29) through the flow channel on the valve body (30); the threaded mounting hole I is connected to the hydraulic control gas reversing valve (32), the threaded mounting hole II is connected to the gas control reversing valve (10), and the threaded mounting hole III is connected to the atmosphere; an O-ring I (20), an O-ring II (21) and an O-ring III (22) are installed between the valve core (29) and the valve body (30), and an O-ring II (21) and an O-ring III

[0041] (22) An annular groove is provided between the two.

[0042] The valve core (29) is in the first position, the compression spring (19) is compressed, and high-pressure air enters from the threaded mounting hole I. The threaded mounting hole I and the threaded mounting hole II are connected through the annular groove. The compressed air acts on the bottom of the valve core (29) to keep the valve core (29) in the first position; the control port k of the air-controlled reversing valve (10) is connected to the compressed air.

[0043] The valve core (29) is in the second position, the threaded mounting hole II is connected to the threaded mounting hole III via the annular groove, the compressed air at the bottom of the valve core (29) is exhausted through the threaded mounting hole III to release the pressure, the threaded mounting hole I and the threaded mounting hole II are disconnected, and the compression spring (19) pushes the valve core (29) to maintain the second position; the control port k of the air-controlled reversing valve (10) is disconnected from the compressed air.

[0044] The handle head 14 of the pneumatic control safety device 12 is connected to the connecting rod 15 by threads and fixed to prevent loosening by the top screw 16. The connecting rod 15 is connected to the valve core 29 by threads. The upper cover plate 17 is fixed to the valve body 30 by screws 31. A compression spring 19 is installed between the upper cover plate 17 and the valve core 29; the pressure cover 24 is connected to the valve body 30 by threads, and a sealing gasket 23 is installed in the middle. O-ring I20, O-ring II21 and O-ring III22 are installed between the valve core 29 and the valve body 30. The valve body 30 is processed with threaded mounting holes I, II and III. The threaded mounting hole II is connected to the bottom of the valve core 29 through small holes I26 and small holes II28. The small holes I26 and small holes II28 are blocked by plugs II27 and plugs I25 respectively. The pressure cover 24 is connected to the valve body 30 by threads.

[0045] The handle head 14 is connected with the connecting rod 15 and the valve core 29. When the pneumatic control safety device 12 is pulled up, Figure 2 As shown, after the handle head 14 drives the valve core 29 to move upward and compress the spring 19 to the position, the threaded mounting hole I is connected with the threaded mounting hole II, and the threaded mounting hole II is provided with a small hole II 28. The compressed air enters the lower end of the valve core 29 through the small hole I 26. The compressed air acts on the lower working surface of the valve core 29, pushing the valve core 29 to move upward and compressing the spring. After the handle head 14 is released, the valve core 29 is in the upper position under the action of the compressed air.

[0046] When the handle head of the pneumatic control safety device 12 is photographed, Figure 3 As shown, the threaded mounting hole I is sealed, the threaded mounting hole II is connected to the threaded mounting hole III, the compressed air at the lower end of the valve core 29 is exhausted through the threaded mounting hole III to release the pressure, and the valve core 29 is in the lower position under the action of the compression spring 19.

[0047] When switching to the operating state, the handle of the manual parking valve 42 must be pulled to the parking position, and the pneumatic control safety device 12 must be manually pressed down at the same time, so that the control port k of the pneumatic control reversing valve 10 is connected to the atmosphere through the threaded mounting hole II and the threaded mounting hole III of the pneumatic control safety device 12, the pneumatic control reversing valve 10 is switched to the lower position, and the high-pressure oil in the parking brake 11 returns to the oil tank through the A port and the T port of the pneumatic control reversing valve 10, and the vehicle is in the parking state.

[0048] On the traveling mechanism side, the pressure oil passes through the throttle valve 7, the pressure reducing valve 13, and the port k of the hydraulic control gas reversing valve 32, so that the hydraulic control gas reversing valve 32 is switched to the lower position, that is, the port I of the hydraulic control gas reversing valve 32 is blocked, and the ports III and II are connected to the atmosphere. At this time, the compressed air in the threaded mounting hole I and the threaded mounting hole II of the pneumatic control safety device 12 is connected to the atmosphere through the ports III and II of the hydraulic control gas reversing valve 32, and the compressed air at the lower end of the pneumatic control safety device 12 is released, and the valve core 29 drives the connecting rod 15 and the handle head 14 to move downward to the lower position under the action of the compression spring 19. If the vehicle is switched to the traveling mechanism at this time, even if the manual parking valve 42 is in the released state, the vehicle is still in the parking state, and the pneumatic control safety device 12 must be manually pulled up before driving to release the brake. This avoids the vehicle slipping when the vehicle is in a slope or gear state when switching from the operating mechanism to the traveling system, and the driver is not in place.

[0049] The anti-skid safety control system for explosion-proof vehicles with operating mechanisms can be applied to all explosion-proof vehicles with operating mechanisms for mining explosion-proof diesel engines. Under the current strict safety control environment, it increases the reliability and safety of vehicle operation, realizes automatic parking brakes in various working conditions of vehicles, avoids the occurrence of safety accidents, and effectively reduces safety accidents.

[0050] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A safety control system for an explosion-proof vehicle with an operating mechanism to prevent the vehicle from slipping, characterized in that: It comprises an air source (37), a manual reversing valve (33), a hydraulically controlled air reversing valve (32), a pneumatic control safety device (12), a parking brake (11), an operating mechanism control system and a walking mechanism brake control system; The gas source (37) is divided into three paths after passing through ports I and III of the manual reversing valve (33). The first path reaches the starting system (38), the second path reaches the pneumatic control safety device (12) after passing through ports I and III of the hydraulic control gas reversing valve (32), and the third path is used to control the on and off of the diesel engine starting circuit. The pneumatic control safety device (12) is connected to a control port k of a pneumatic control reversing valve (10) in a walking mechanism brake control system; The control port k of the hydraulically controlled gas reversing valve (32) is connected to the oil circuit in the operating mechanism control system; The manual reversing valve (33) is in the upper position, the I port is connected to the III port, the starting system (38) is working, the diesel engine starting circuit is open, the pneumatic control safety device (12) is in the passage, so that the pneumatic control reversing valve (10) is switched to the A port and the P port are connected, and the parking brake (11) is released; The manual reversing valve (33) is in the lower position, the port III is connected to the port II, the starting system (38) is shut down, the diesel engine starting circuit is shut down, and the pneumatic control safety device (12) is depressurized and reset, so that the pneumatic control reversing valve (10) is switched to the position where the port A is connected to the port T, and the parking brake (11) is applied; When the operating mechanism control system controls the operation of the operating mechanism, it synchronously controls the reversal of the hydraulic-controlled air reversing valve (32), the port I of the hydraulic-controlled air reversing valve (32) is sealed, the ports III and II are connected to the atmosphere, the pneumatic control safety device (12) is depressurized and reset to make the port A of the air-controlled reversing valve (10) connected to the port T, and the parking brake (11) is applied.

2. A safety control system for preventing an explosion-proof vehicle from slipping with an operating mechanism according to claim 1, characterized in that: The pneumatic control safety device (12) comprises a valve body (30), a valve core (29), a connecting rod (15) and an upper cover plate (17); The valve core (29) is inserted into the valve body (30), a sealed space is formed between the bottom of the valve core (29) and the valve body (30), the upper cover plate (17) is fixed to the valve body (30) by screws (31), a compression spring (19) is installed between the upper cover plate (17) and the valve core (29), and the connecting rod (15) passes through the upper cover plate (17) and is connected to the valve core (29); The valve body (30) is provided with threaded mounting holes I, II and III which are connected to the inside and outside. The threaded mounting hole II is connected to the sealing space at the bottom of the valve core (29) through the flow channel on the valve body (30); the threaded mounting hole I is connected to the hydraulically controlled gas reversing valve (32), the threaded mounting hole II is connected to the gas-controlled reversing valve (10), and the threaded mounting hole III is connected to the atmosphere; An O-ring I (20), an O-ring II (21) and an O-ring III (22) are installed between the valve core (29) and the valve body (30), and an annular groove is provided between the O-ring II (21) and the O-ring III (22); The valve core (29) is in the first position, the compression spring (19) is compressed, and high-pressure air enters from the threaded mounting hole I. The threaded mounting hole I and the threaded mounting hole II are connected through the annular groove. The compressed air acts on the bottom of the valve core (29) to keep the valve core (29) in the first position; the control port k of the air-controlled reversing valve (10) is connected to the compressed air; The valve core (29) is in the second position, the threaded mounting hole II is connected to the threaded mounting hole III via the annular groove, the compressed air at the bottom of the valve core (29) is exhausted through the threaded mounting hole III to release the pressure, the threaded mounting hole I and the threaded mounting hole II are disconnected, and the compression spring (19) pushes the valve core (29) to maintain the second position; the control port k of the air-controlled reversing valve (10) is disconnected from the compressed air.

3. A safety control system for preventing an explosion-proof vehicle from slipping with an operating mechanism according to claim 2, characterized in that: The walking mechanism brake control system comprises a gear pump (1), a manual reversing valve (3), an accumulator (8), a hydraulically controlled reversing valve (9), a pneumatically controlled reversing valve (10), a manual parking valve (42) and a parking brake (11); The gear pump (1) is installed on the diesel engine and connected to the oil tank to provide pressure oil for the travel mechanism brake control system. The pressure port of the gear pump (1) is connected to the P port of the manual reversing valve (3), and the A port of the manual reversing valve (3) is respectively connected to the accumulator (8) and the travel system (6); the accumulator (8) is connected to the P port of the hydraulic control reversing valve (9), and the A port of the hydraulic control reversing valve (9) is connected to the P port and the T port of the air control reversing valve (10) and connected back to the oil tank; the A port of the air control reversing valve (10) is connected to the P port and the T port of the manual parking valve (42) and connected back to the oil tank; the A port of the manual parking valve (42) is connected to the piston chamber of the parking brake (11) and the T port and connected back to the oil tank; The operating mechanism control system comprises an operating mechanism (5), a port B of a manual reversing valve (3) is connected to the operating mechanism (5) and a throttle valve (7), and the throttle valve (7) is divided into two paths, one path to the port Z of a hydraulically controlled reversing valve (9), so that the hydraulically controlled reversing valve (9) is switched to the port P and blocked, and the port A is connected to the port T; the other path is reduced in pressure by a relief valve (13) and reaches the control port k of a hydraulically controlled gas reversing valve (32), so that the hydraulically controlled gas reversing valve (32) is switched to the port I and sealed, and the ports III and II are connected to the atmosphere.

4. A safety control system for preventing an explosion-proof vehicle from slipping with an operating mechanism according to claim 1, characterized in that: The diesel engine starting circuit comprises an air swing motor (34), an electric switch (36) and an ECU (40); the output shaft of the air swing motor (34) is connected to an electric switch handle (41) of the electric switch (36) via a torsion spring (35); the air swing motor (34) rotates to open the electric switch (36); after the air swing motor (34) is depressurized, the electric switch handle (41) is reset under the action of the torsion spring (35), and the electric switch (36) is powered off.

5. The safety control system for preventing an explosion-proof vehicle from slipping with an operating mechanism according to claim 2 is characterized in that: One end of the connecting rod (15) is connected to the handle head (14) through a thread and fixed by a top screw (16), and the other end is connected to the valve core (29) through a thread.

6. A safety control system for preventing an explosion-proof vehicle from slipping with an operating mechanism according to claim 2, characterized in that: The threaded mounting hole II is connected to the bottom of the valve core (29) through the small hole I (26) and the small hole II (28), and the small hole I (26) and the small hole II (28) are blocked by the plug II (27) and the plug I (25) respectively.

7. A safety control system for preventing an explosion-proof vehicle from slipping with an operating mechanism according to claim 3, characterized in that: A safety valve I (2) is arranged between the traveling mechanism (6) and the oil tank, and the pressure of the traveling mechanism (6) is set by the safety valve I (2).

8. The safety control system for preventing an explosion-proof vehicle from slipping with an operating mechanism according to claim 3 is characterized in that: A safety valve II (4) is arranged between the operating mechanism (5) and the oil tank, and the pressure of the operating mechanism (5) is set by the safety valve II (4).

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