Control device for realizing automatic parking brake at multiple angles for explosion-proof vehicles used in coal mines

Abstract

The present invention belongs to the field of safety control of underground explosion-proof vehicles, and specifically relates to a control device for realizing automatic parking brake at multiple angles for explosion-proof vehicles used in coal mines; the device comprises a hydraulic execution system, an air control system and an electric control system; the hydraulic execution system comprises an accumulator, a parking brake, a parking brake valve, an air-controlled reversing valve and a solenoid valve; the electric control system comprises an air-controlled electric switch, a main engine, a controller and a speed sensor for monitoring the wheel speed; the air control system comprises an air source and a toggle valve, the air source is connected to the toggle valve, and the air path led out from the toggle valve is respectively connected to a brake release valve and an air-controlled electric switch; the brake release valve is connected to the air-controlled reversing valve; the control device for automatic parking brake can be applied to all explosion-proof diesel engine vehicles used in mines, and in the current environment with strict control on safety, it increases the reliability and safety of vehicle operation, realizes automatic implementation of parking brake in various working conditions of the vehicle, and effectively reduces safety accidents.

Description

Technical Field

[0001] The present invention belongs to the field of safety control of underground explosion-proof vehicles, and in particular relates to a control device for realizing automatic parking brake at multiple angles for an explosion-proof vehicle used in coal mines. Background Art

[0002] Explosion-proof rubber-tyred vehicles operating underground in coal mines are equipped with a safety wet parking brake and parking control system in accordance with relevant standards. The parking brake is spring-applied and hydraulically released. Normally, the parking brake is manually engaged after the vehicle has parked properly. It is only used as an emergency brake in critical situations, such as when the service brakes fail completely. However, during operation in underground coal mines, explosion-proof vehicles can slip due to human error or other inadequate management. Summary of the Invention

[0003] The purpose of the present invention is to improve the original vehicle brake control device to realize automatic parking brake after the vehicle is turned off, automatic parking brake after the vehicle stops, and automatic deceleration brake after the protection index exceeds the standard during vehicle operation.

[0004] The present invention provides the following technical solutions: a control device for realizing automatic parking brake at multiple angles for explosion-proof vehicles used in coal mines, comprising a hydraulic execution system, a pneumatic control system and an electronic control system;

[0005] The hydraulic actuator system includes an accumulator as an oil source, a parking brake as an actuator, and a conversion element in the hydraulic pipeline between the oil source and the actuator. The conversion element includes a parking brake valve, an air-controlled reversing valve, and a solenoid valve.

[0006] The electronic control system includes a pneumatically controlled electric switch, a main engine, a controller, and a speed sensor for monitoring wheel speed. The pneumatically controlled electric switch is used to control the main engine's opening and closing, while the main engine collects speed information fed back by the speed sensor. The main engine and the controller communicate via the CAN bus.

[0007] The solenoid valve is controlled by the controller to automatically cut off the power and manually supply power. The controller determines whether the speed information is zero. If the speed information is zero, the controller controls the solenoid valve to cut off the power, unloading the parking brake pressure oil to achieve automatic parking. The control solenoid valve is powered by the manual button on the controller to release the parking brake.

[0008] The pneumatic control system includes an air source and a toggle valve. The air source is connected to the toggle valve. The air path from the toggle valve is connected to the brake release valve and the air-controlled electric switch respectively. The brake release valve is connected to the air-controlled reversing valve.

[0009] After the toggle valve supplies air, the air-controlled electric switch opens, and the air-controlled reversing valve connects the oil line from the accumulator to the parking brake, and the vehicle's pneumatic brakes are automatically released; after the toggle valve releases pressure, the air-controlled reversing valve releases pressure, and the air-controlled reversing valve connects the oil line from the parking brake to the fuel tank; the vehicle automatically brakes when the engine is turned off.

[0010] Furthermore, the hydraulic execution system further comprises a proportional solenoid valve, the oil circuit of the proportional solenoid valve is connected to the parking brake and the oil tank, and the circuit of the proportional solenoid valve is connected to the controller;

[0011] The pneumatic control system also includes a protection solenoid valve, which is connected to the toggle valve;

[0012] The controller determines whether the various protection indicators of the explosion-proof vehicle are exceeded during operation. If there are protection indicators that exceed the standard, the proportional solenoid valve and the protection solenoid valve are controlled to cut off the power. The power-off time of the proportional solenoid valve is delayed from the maximum voltage to the power-off. The P port and the A port gradually become open from being blocked, and the parking brake pressure is slowly released.

[0013] Furthermore, an electric travel switch is installed at the accelerator pedal of the explosion-proof vehicle. The electric travel switch is connected to the controller as a power supply switch for the solenoid valve. When the accelerator pedal is actuated, the electric travel switch provides a passage for powering the solenoid valve.

[0014] Furthermore, the air path leading out from the brake release valve is divided into two paths, one path is connected to the air-controlled reversing valve, and the other path is connected to the air-controlled brake release valve indicating device.

[0015] Furthermore, the brake release valve indicator device includes a mounting seat, an indicator block and a return spring. The indicator block is slidingly sealed and assembled in the guide cavity of the mounting seat. The top of the indicator block is exposed. The mounting seat is provided with a limiter to prevent the indicator block from escaping from the guide cavity. The guide cavity is connected to the air inlet. The return spring is connected between the indicator block and the mounting seat. The air inlet is connected to the brake release valve. When ventilation occurs, the air pressure lifts up the indicator block. After deflation, the return spring causes the indicator block to fall back.

[0016] Furthermore, it also includes a pressure cover, which is sleeved on the outside of the indicator block and connected to the mounting seat; the matching part between the indicator block and the guide cavity is a stepped column that gradually becomes thinner from the outside to the inside, and the innermost level of the stepped column is sleeved with a sealing ring, which is slidably sealed with the guide cavity; the outermost level of the stepped column is provided with a boss, and the return spring is sleeved on the stepped column, and the two ends are connected to the boss and the pressure cover.

[0017] Furthermore, the bottom of the mounting seat is a stud, and the mounting seat is mounted on the mounting plate through a locking nut.

[0018] Compared with the prior art, the advantages of the present invention are:

[0019] The present invention provides a control device for multi-angle automatic parking brakes for explosion-proof vehicles used in coal mines. The device implements multi-dimensional automatic control, including automatic parking brakes after the vehicle is turned off, automatic parking brakes via speed sensing after the vehicle stops, and automatic deceleration braking when a protective indicator exceeds a standard during vehicle operation. Furthermore, a series of safety control devices are provided, including manual brake release and intuitive observation of the vehicle's parking brake status. This device addresses the issue of sudden braking when vehicle indicators exceed standards during high-speed operation, potentially causing safety accidents to personnel or vehicles due to inertial impact. Furthermore, to prevent parking brake wear caused by operating the vehicle in the braking state, an observation indicator button is provided, which is also linked to the accelerator pedal, addressing the issue of parking brake wear caused by the driver forgetting to press the manual button.

[0020] This automatic parking brake control device can be applied to all mining explosion-proof diesel vehicles. In today's strictly controlled safety environment, it increases the reliability and safety of vehicle operation, automatically applies the parking brake under various vehicle operating conditions, and effectively reduces the occurrence of safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of the brake release valve indicator device (the indicator block pops up);

[0023] Figure 3 It is a structural diagram of the brake release valve indicating device (indicating block reset);

[0024] In the figure: 1-air source, 2-slide valve, 3-air-controlled electric switch, 4-main engine, 5-protection solenoid valve, 6-throttle cylinder, 7-brake release valve, 8-brake release valve indicating device, 9-air-controlled reversing valve, 10-parking brake valve, 11-accumulator, 12-solenoid valve I, 13-speed sensor, 14-electric manual button, 15-electric travel switch, 16-accelerator pedal, 17-controller, 18-parking brake, 19-proportional solenoid valve, 20-cover, 21-countsunk screw, 22-indicator block, 23-reset spring, 24-mounting seat, 25-sealing ring, 26-air inlet, 27-mounting plate, 28-locking nut. DETAILED DESCRIPTION

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0026] like Figure 1 Shown: A control device for realizing automatic parking brake at multiple angles for explosion-proof vehicles used in coal mines, including a hydraulic execution system, a pneumatic control system, and an electronic control system;

[0027] The hydraulic actuator system includes an accumulator 11 as an oil source, a parking brake 18 as an actuator, and a conversion element in the hydraulic pipeline between the oil source and the actuator. The conversion element includes a parking brake valve 10, an air-controlled reversing valve 9, and a solenoid valve 12.

[0028] The electronic control system includes a pneumatically controlled electric switch 3, a host 4, a controller 17, and a speed sensor 13 for monitoring wheel speed. The pneumatically controlled electric switch 3 is used to control the opening and closing of the host 40, and the host 4 is used to collect speed information fed back by the speed sensor 13. The host 4 and the controller 17 communicate via the CAN bus.

[0029] The solenoid valve 12 is controlled by the controller 17 to automatically cut off the power and manually supply power. The controller 17 determines whether the speed information is zero. If the speed information is zero, the controller 17 controls the solenoid valve 12 to cut off the power, and the parking brake 18 pressure oil is unloaded to achieve automatic parking. The control solenoid valve 12 is powered by the electric manual button 14 on the controller 17 to release the parking brake.

[0030] The pneumatic control system includes an air source 1 and a toggle valve 2. The air source 1 is connected to the toggle valve 2. The air path leading from the toggle valve 2 is connected to the brake release valve 7 and the air-controlled electric switch 3 respectively; the brake release valve 7 is connected to the air-controlled reversing valve 9;

[0031] After the toggle valve 2 supplies air, the pneumatically controlled electric switch 3 opens, and the pneumatically controlled reversing valve 9 connects the oil line from the accumulator 11 to the parking brake 18, and the vehicle is automatically pneumatically released; after the toggle valve 2 releases pressure, the pneumatically controlled reversing valve 9 releases pressure, and the pneumatically controlled reversing valve 9 connects the oil line from the parking brake 18 to the fuel tank; the vehicle automatically brakes when the engine is turned off.

[0032] The hydraulic actuator system also includes a proportional solenoid valve 19, the oil circuit of the proportional solenoid valve 19 is connected to the parking brake 18 and the oil tank, and the circuit of the proportional solenoid valve 19 is connected to the controller 17;

[0033] The air control system also includes a protection solenoid valve 5, which is connected to the toggle valve 2;

[0034] The controller 17 determines whether the various protection indicators of the explosion-proof vehicle are exceeded during operation. When there are protection indicators that exceed the standard, the proportional solenoid valve 19 and the protection solenoid valve 5 are controlled to cut off the power. The power-off time of the proportional solenoid valve 19 is delayed from the maximum voltage to the power-off, and the P port and the A port gradually become open from being blocked, and the pressure of the parking brake 18 is slowly released.

[0035] After the vehicle starts normally, first move toggle valve 2 to the left position. Compressed air from air source 1 flows one way to port 1 of protective solenoid valve 5 and another way to pneumatically controlled electric switch 3. This opens main engine 4, energizing protective solenoid valve 5 and switching it to the right position, connecting ports 1 and 2. Pull up brake release valve 7 and switch it to the down position, connecting ports 1 and 2. Then, the air flows one way to port K of pneumatically controlled reversing valve 9, switching it to the down position, connecting ports P and A. Then, the air flows one way to the air inlet of brake release valve indicator 8. Proportional solenoid valve 19 is energized, blocking ports P and A. Manually press power button 14, energizing solenoid valve 12 and switching it to the down position, connecting ports P and A. Pull up parking brake valve 10, connecting ports P and A. At this time, the high-pressure oil from the accumulator 11 passes through the P port and A port of the parking brake valve 10, the P port and A port of the air-controlled reversing valve 9, and the P port and A port of the solenoid valve 12 to the parking brake 18, compressing the spring to release the brake.

[0036] When the vehicle is shut down normally, toggle switch 2 to the right position, ports 2 and 3 are connected, and the pressure is released to the atmosphere. Ports 2 and 1 of the brake release valve 7 are depressurized through the toggle valve 2. At this time, the control port 4 of the brake release valve is also depressurized, and the control port k of the air-controlled reversing valve 9 is depressurized. The valve is switched to the upper position, ports A and T are connected, and the fuel tank is returned. The parking brake 18 is reset under the action of the spring, and the braking is implemented, realizing the automatic braking function after the vehicle is shut down.

[0037] When the vehicle is parked but the engine is still running, a solenoid valve 12 is installed to prevent the driver from sliding away by pulling the parking brake. Its energization and de-energization are controlled by vehicle speed. During normal vehicle operation, the solenoid valve is energized and in the down position, connecting ports P and A, releasing the parking brake. When the speed sensor 13 detects zero speed, the protection host 4 collects the speed signal and transmits it via the CAN bus to the controller 17. Controller 17 de-energizes solenoid valve 12, connecting ports A and T, and automatically releasing the parking brake pressure oil, thus achieving the automatic parking function when the vehicle is parked and the engine is not shut off. When the vehicle needs to be started, the electric manual button 14 energizes solenoid valve 12 to release the parking brake.

[0038] When vehicle protection indicators exceed standards, which include methane concentration, engine cooling water temperature, oil pressure, and exhaust temperature, the protection sensor sends a signal to the main engine, which then sends a signal to protection solenoid valve 5 via the CAN bus. This de-energizes protection solenoid valve 5, discharging the air pressure at the throttle cylinder inlet to the atmosphere. The throttle cylinder resets under the action of the spring, blocking the air intake to the engine and causing the engine to stall. Since the protection solenoid valve is de-energized, a signal is sent to de-energize the solenoid valve, and proportional solenoid valve 19 is also de-energized. The power-off time for proportional solenoid valve 19 is set to a delay from maximum voltage to power-off. Ports P and A gradually become open from blocked to open, and parking brake pressure is slowly released. This ensures that the vehicle automatically brakes after exceeding the protection standard, and achieves slow braking, avoiding safety hazards caused by impact when the vehicle is suddenly braked for protection during high-speed driving.

[0039] An electric travel switch 15 is installed at the accelerator pedal 16 of the explosion-proof vehicle. The electric travel switch 15 is connected to the controller 17 as the power supply switch for the solenoid valve 12. When the accelerator pedal 16 is actuated, the electric travel switch 15 is used as a pathway to supply power to the solenoid valve 12. The electric travel switch installed at the accelerator pedal automatically supplies power to the solenoid valve 12 when the vehicle is started, solving the problem of wear on the parking brake caused by starting the vehicle when the driver forgets to manually operate the manual electric button to supply power to the solenoid valve 12.

[0040] The brake release valve 7 features an automatic reset function and an indicator. This reset function allows the valve to be manually pulled out during normal vehicle operation. When the vehicle is turned off and pressure is lost, the valve button automatically retracts due to a spring. Manual re-engagement is required to prevent the vehicle from rolling if the valve is in the released position and the vehicle is suddenly started. The air path from the brake release valve 7 is divided into two paths: one connected to the pneumatically controlled reversing valve 9 and the other to the pneumatically controlled brake release valve indicator 8.

[0041] like Figure 2 、 Figure 3 As shown: the brake release valve indicating device 8 includes a mounting seat 24, an indicating block 22 and a return spring 23. The indicating block 22 is slidingly sealed and assembled in the guide cavity of the mounting seat 24. The top of the indicating block 22 is exposed. The mounting seat 24 is provided with a limiter to prevent the indicating block 22 from escaping from the guide cavity. The guide cavity is connected to the air inlet 26. The countersunk hole at the bottom of the indicating block 22 is aligned with the airway in the mounting seat 24. The return spring 23 is connected between the indicating block 22 and the mounting seat 24. The air inlet 26 is connected to the brake release valve 7. When ventilated, the air pressure lifts the indicating block 22. After deflation, the return spring 23 causes the indicating block 22 to fall back.

[0042] The mounting base 24 is silvery white, and the indicator block 22 is bright orange. When there is no ventilation, the indicator block 22 is embedded in the middle of the mounting base 24 and is flush with the top of the mounting base 24.

[0043] When brake release valve 7 is pulled, ports 1 and 2 of the valve are open, allowing compressed air to flow through ports 1 and 2 to the control port of air-controlled reversing valve 9, reversing the valve's direction and releasing the brakes. Simultaneously, the compressed air reaches the air inlet of the indicator device, passing through a channel and into the small hole of indicator block 22. This pushes indicator block 22 upward, compressing return spring 23 and causing the bright orange color to protrude from mounting seat 24. This allows the driver to clearly see that the vehicle's brakes are released by indicator block 22. When brake release valve 7 is pressed, ports 2 and 3 of the valve are open to atmosphere, applying the parking brake. The compressed air in the indicator device is simultaneously depressurized, causing return spring 23 to reset indicator block 22 and retract it into mounting seat 24.

[0044] The indicator device can intuitively determine whether the vehicle is in the parking brake position or the brake release position. This can effectively avoid the wear of the brake friction plate caused by the vehicle being engaged and moving forward when the vehicle is in the braking position.

[0045] The brake release valve indicating device 8 also includes a pressure cover 20, which is sleeved on the outside of the indicating block 22 and connected to the mounting seat 24. The pressure cover 20 is fixed to the mounting seat 24 by a countersunk screw 21; the matching part of the indicating block 22 and the guide cavity is a stepped column that gradually becomes thinner from the outside to the inside. The innermost level of the stepped column is sleeved with a sealing ring 25, and the sealing ring 25 is slidably sealed with the guide cavity to ensure that the gas does not leak; the outermost level of the stepped column is provided with a boss, and the reset spring 23 is sleeved on the stepped column, and the two ends are connected to the boss and the pressure cover 20.

[0046] The bottom of the mounting seat 24 is a stud, and the mounting seat 24 is mounted on the mounting plate 27 through a locking nut 28 .

[0047] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily 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 is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control device for realizing automatic parking brake at multiple angles for explosion-proof vehicles used in coal mines, characterized by: Including hydraulic execution system, pneumatic control system and electronic control system; The hydraulic actuator system includes an accumulator (11) as an oil source, a parking brake (18) as an actuator, and a conversion element in a hydraulic pipeline between the oil source and the actuator, wherein the conversion element includes a parking brake valve (10), an air-controlled reversing valve (9), and a solenoid valve (12); The electronic control system includes a pneumatically controlled electric switch (3), a host (4), a controller (17), and a speed sensor (13) for monitoring the wheel speed; the pneumatically controlled electric switch (3) is used to control the opening and closing of the host (4), and the host (4) is used to collect speed information fed back by the speed sensor (13); the host (4) and the controller (17) communicate via a CAN bus; The solenoid valve (12) is controlled by the controller (17) to automatically cut off the power and manually supply power; the controller (17) determines whether the speed information is zero. If the speed information is zero, the controller (17) controls the solenoid valve (12) to cut off the power, and the parking brake (18) unloads the pressure oil to achieve automatic parking; the control solenoid valve (12) is powered by the electric manual button (14) on the controller (17) to release the parking brake; The pneumatic control system comprises an air source (1) and a toggle valve (2), wherein the air source (1) is connected to the toggle valve (2), and an air path drawn from the toggle valve (2) is respectively connected to a brake release valve (7) and a pneumatically controlled electric switch (3); the brake release valve (7) is connected to a pneumatically controlled reversing valve (9); After the toggle valve (2) supplies air, the pneumatically controlled electric switch (3) opens, and the pneumatically controlled reversing valve (9) connects the oil path from the accumulator (11) to the parking brake (18), and the vehicle is automatically pneumatically released from the brake; after the toggle valve (2) releases pressure, the pneumatically controlled reversing valve (9) releases pressure, and the pneumatically controlled reversing valve (9) connects the oil path from the parking brake (18) to the fuel tank; the vehicle automatically brakes when the engine is turned off; The air path leading out from the brake release valve (7) is divided into two paths, one path is connected to the air-controlled reversing valve (9), and the other path is connected to the air-controlled brake release valve indicating device (8); The brake release valve indicating device (8) comprises a mounting seat (24), an indicating block (22) and a return spring (23). The indicating block (22) is slidingly and sealingly assembled in a guide cavity of the mounting seat (24). The top of the indicating block (22) is exposed. A limiter is provided on the mounting seat (24) to prevent the indicating block (22) from escaping from the guide cavity. The guide cavity is connected to an air inlet (26). The return spring (23) is connected between the indicating block (22) and the mounting seat (24). The air inlet (26) is connected to the brake release valve (7). When air is ventilated, the air pressure lifts the indicating block (22). After air is deflated, the return spring (23) causes the indicating block (22) to fall back.

2. The control device for realizing multi-angle automatic parking brake of a coal mine explosion-proof vehicle according to claim 1 is characterized in that: The hydraulic execution system further includes a proportional solenoid valve (19), the oil circuit of the proportional solenoid valve (19) is connected to the parking brake (18) and the oil tank, and the circuit of the proportional solenoid valve (19) is connected to the controller (17); The air control system further comprises a protective solenoid valve (5), which is connected to the toggle valve (2); The controller (17) determines whether various protection indicators of the explosion-proof vehicle are exceeded during operation. When the protection indicators exceed the standards, the proportional solenoid valve (19) and the protection solenoid valve (5) are controlled to be de-energized. The power-off time of the proportional solenoid valve (19) is set to a delay from the maximum voltage to the power-off. The P port and the A port are gradually opened from being blocked, and the parking brake (18) pressure is slowly released.

3. The control device for realizing multi-angle automatic parking brake of a coal mine explosion-proof vehicle according to claim 2 is characterized in that: An electric travel switch (15) is installed at the accelerator pedal (16) of the explosion-proof vehicle. The electric travel switch (15) is connected to the controller (17) as a power supply switch for the solenoid valve (12). When the accelerator pedal (16) is actuated, the electric travel switch (15) is a passage for supplying power to the solenoid valve (12).

4. The control device for realizing multi-angle automatic parking brake of explosion-proof vehicle for coal mine according to claim 1 is characterized in that: The device further comprises a pressure cover (20), which is sleeved on the outside of the indicator block (22) and connected to the mounting seat (24); the matching portion between the indicator block (22) and the guide cavity is a stepped column that tapers from the outside to the inside, the innermost stage of the stepped column is sleeved with a sealing ring (25), and the sealing ring (25) is slidably sealed with the guide cavity; the outermost stage of the stepped column is provided with a convex shoulder, and the return spring (23) is sleeved on the stepped column, with both ends connected to the convex shoulder and the pressure cover (20).

5. The control device for realizing multi-angle automatic parking brake of explosion-proof vehicle for coal mine according to claim 4 is characterized in that: The bottom of the mounting seat (24) is a stud, and the mounting seat (24) is mounted on the mounting plate (27) through a locking nut (28).

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