Brake integrated control valve group, mining dump truck brake system and brake method

Abstract

The brake integrated control valve group comprises a brake control valve block, a two-position three-way reversing valve, a stop valve, a proportional pressure reducing valve, a pressure sensor, a controller and a knob switch, a monitoring port of the brake control valve is provided with a pressure sensor, the signal output end of the pressure sensor is connected with the signal input end of the controller through a line, the signal output end of the knob switch is connected with the signal input end of the controller through a line, and the signal output end of the controller is connected with a control port of the proportional pressure reducing valve through a line. The invention further discloses a mining dump truck braking system and a mining dump truck braking method. The maximum braking force of the front brake can be adjusted in time according to the road condition, the reliability of a braking system is effectively improved, and meanwhile the driving safety of the whole vehicle is improved.

Description

Technical Field

[0001] The invention belongs to the field of mining dump trucks, and in particular relates to a braking integrated control valve group, a braking system and a braking method for a mining dump truck. Background Art

[0002] Mining dump trucks are off-road dump trucks, mainly used for the transportation of ores and mineral materials in large open-pit mines. Mining dump trucks are mainly composed of a frame, engine, transmission box, cab assembly, brake control valve, etc. Among them, the brake control valve is an important component of mining dump trucks and has a vital impact on the driving safety and reliability of dump trucks.

[0003] At present, the brake control valve of mining dump trucks is generally composed of a front brake pressure reducing valve, a loading brake valve, and hydraulic pipelines. When the foot brake valve pedal is stepped on, high-pressure oil enters the brake through the foot brake valve to push the brake piston to move. The brake piston presses the friction plate tightly against the brake disc to play a braking role; when loading or unloading, the loading brake valve cuts off the oil sent to the front brake, and only the rear brake works; when the road is slippery and muddy on rainy and snowy days, the front brake pressure reducing valve reduces the brake oil pressure to the front brake. However, this brake control valve not only requires many hydraulic components, but each valve component is installed separately, resulting in complex pipeline connections. The key disadvantage is that the driver cannot adjust the maximum braking force of the front brake in time according to the road conditions, which has a great impact on the safety and reliability of driving.

[0004] like Figure 1 The figure shows a schematic diagram of the structure of a braking system for a mining dump truck in the prior art.

[0005] The braking system of a mining dump truck includes: a hydraulic oil tank 101, a hydraulic pump 102, a front brake accumulator non-return valve 103, a rear brake accumulator non-return valve 104, a front brake accumulator 105, a rear brake accumulator 106, a foot brake valve 107, a loading brake valve 108, a front brake half valve 109, a first non-return valve 110, a pressure reducing valve 111, an electromagnetic reversing valve 112, a second non-return valve 113, a rear brake 114, and a front brake 115.

[0006] The hydraulic pump 102 sucks hydraulic oil from the hydraulic oil tank 101, and is connected to the first oil inlet P1 and the second oil inlet P2 of the foot brake valve 107 respectively through the front brake accumulator check valve 103 and the rear brake accumulator check valve 104; the first output port B1 of the foot brake valve 107 is connected to the front brake 115 through the loading brake valve 108 and the front brake half valve 109; the second output port B2 of the foot brake valve 107 is connected to the rear brake 114. The first output port (B1 port) and the second output port (B2 port) of the foot brake valve 107 are also connected to the first oil inlet (P1 port) and the second oil inlet (P2 port) respectively, and the front brake accumulator 105 and the rear brake accumulator 106 are connected.

[0007] (1) The vehicle is in the off state. The engine is not running, so there is no pressurized oil in the brake system and the entire brake system does not work.

[0008] (2) When the vehicle is in the starting state, the engine drives the hydraulic pump 102 to rotate and output pressure oil. The pressure oil enters the front brake accumulator 105 through the front brake accumulator non-return valve 103, and the pressure oil also enters the rear brake accumulator 106 through the rear brake accumulator non-return valve 104. At the same time, the pressure oil enters the first oil inlet (P1 port) and the second oil inlet (P2 port) of the foot brake pedal valve 107. The oil pressure continues to increase and is maintained at the set value of the hydraulic pump 102.

[0009] (3) The vehicle is in the braking state. At this time, the engine is running. When the pedal of the foot brake valve 107 is pressed, the hydraulic oil enters the oil inlet (P port) of the loading brake valve 108 through the first output port (B1 port) of the foot brake valve 107, and then is output to the oil inlet (P port) of the front brake half valve 109 through the working oil port (A) of the loading brake valve 108, and then passes through the oil inlet (P port) of the electromagnetic reversing valve 112 to the oil return port (T port), and finally enters the front brake 115 from the oil outlet (BF port) of the front brake half valve 109. At the same time, the hydraulic oil enters the rear brake 114 through the second output port (B2 port) of the foot brake valve 107.

[0010] (4) When the vehicle is in the loading brake state, the pedal of the foot brake valve 107 is pressed, and at the same time, the solenoid valve of the loading brake valve 108 is energized, so that the pressure oil to the front brake 115 is cut off by the loading brake valve 108, and the front brake 115 has no braking effect. Only the rear brake 114 has a braking effect.

[0011] (5) When the vehicle is in the state of front brake force halved, the pedal of the foot brake valve 107 is pressed, the electromagnetic reversing valve 112 is energized, and the hydraulic oil enters the oil inlet (P port) of the loading brake valve 108 through the first output port (B1 port) of the foot brake valve 107, and then is output from the working oil port (A port) of the loading brake valve 108 to the oil inlet (P port) of the front brake half-reduction valve 109. Since the energization of the electromagnetic reversing valve 112 cuts off the passage from the oil inlet (P port) of the electromagnetic reversing valve 112 to the oil return port (T port), the oil can only pass through the pressure reducing valve 111 and the first non-return valve 110 and finally enter the front brake 115 from the oil outlet (BF port) of the front brake half-reduction valve 109. Since the set pressure value of the pressure reducing valve 111 is half of the maximum pressure value output by the first output port (B1 port) of the foot brake valve 107, the braking force of the front brake 115 is reduced on rainy and snowy days. Summary of the invention

[0012] The purpose of the present invention is to provide a brake integrated control valve group, a braking system and a braking method for a mining dump truck, which can timely adjust the maximum braking force of the front brake according to road conditions, effectively improve the reliability of the braking system, and also improve the driving safety of the entire vehicle.

[0013] To achieve the above purpose, the technical solution used in the present invention is:

[0014] The brake integrated control valve group comprises: a brake control valve block, a two-position three-way reversing valve, a cut-off valve, a proportional pressure reducing valve, a pressure sensor, a controller, and a knob switch. The input port of the two-position three-way reversing valve is connected to the input port of the brake control valve block through a pipeline, the working port of the two-position three-way reversing valve is connected to the input port of the proportional pressure reducing valve through a pipeline, the working port of the proportional pressure reducing valve is connected to the working port of the brake control valve through a pipeline, the oil return port of the proportional pressure reducing valve is connected to the input port of the cut-off valve through a pipeline, the oil return port of the cut-off valve is connected to the oil return port of the brake control valve block through a pipeline, the oil return ports of the two-position three-way reversing valve and the cut-off valve are connected to the oil return port of the brake control valve block through a pipeline, and the oil return port of the brake control valve block is connected to a hydraulic oil tank through a pipeline; a pressure sensor is installed at the monitoring port of the brake control valve, the signal output end of the pressure sensor is connected to the signal input end of the controller through a line, the signal output end of the knob switch is connected to the signal input end of the controller through a line, and the signal output end of the controller is connected to the control port of the proportional pressure reducing valve through a line.

[0015] Furthermore, the brake integrated control valve group is an integrated valve group, and the two-position three-way reversing valve, the cut-off valve, and the proportional pressure reducing valve are all threaded plug-in solenoid valves integrated in the brake integrated control valve group.

[0016] The braking system of a mining dump truck comprises a foot brake valve and a front brake. The first output port of the foot brake valve is connected to the input port of a brake control valve block through a pipeline, and the working port of the brake control valve block is connected to the front brake through a pipeline.

[0017] Further, it includes: a hydraulic oil tank, a hydraulic pump, a front brake accumulator check valve, a rear brake accumulator check valve, a front brake accumulator, a rear brake accumulator, a foot brake valve, a rear brake, and a front brake. The oil inlet of the hydraulic pump is connected to the hydraulic oil tank through a pipeline, and the oil outlet is respectively connected to the front brake accumulator check valve and the rear brake accumulator check valve through pipelines. The front brake accumulator check valve is connected to the first oil inlet of the foot brake valve through a pipeline, the rear brake accumulator check valve is connected to the second oil inlet of the foot brake valve through a pipeline, and the second output port of the foot brake valve is connected to the rear brake through a pipeline.

[0018] Furthermore, the front brake accumulator one-way valve is connected to the first oil inlet of the foot brake valve and the front brake accumulator through pipelines, and the rear brake accumulator one-way valve is connected to the second oil inlet of the foot brake valve and the rear brake accumulator through pipelines.

[0019] The braking method of mining dump truck includes:

[0020] When the vehicle is in the starting state, the engine drives the hydraulic pump to operate and outputs pressure oil, which enters the foot brake valve through the front brake accumulator check valve and the rear brake accumulator check valve. The oil pressure at the first oil inlet and the second oil inlet of the foot brake valve continues to increase and is maintained at the set value of the hydraulic pump. At the same time, the pressure oil enters the front brake accumulator and the rear brake accumulator through the foot brake valve;

[0021] When the vehicle is in the state of reduced front braking force, the pedal of the foot brake valve is stepped on, the solenoid valve of the cut-off valve is energized, and the hydraulic oil enters the input port of the brake control valve block through the first output port of the foot brake valve, and then is output from the input port of the two-position three-way reversing valve to the working port and enters the input port of the proportional pressure reducing valve, and then is output to the working port of the brake control valve block through the working oil port of the proportional pressure reducing valve, and the hydraulic oil enters the front brake, and the front brake is braked; at this time, the input port and the return oil port of the cut-off valve are connected, the knob switch is operated, and the controller sends a command to the control port of the proportional pressure reducing valve, the proportional pressure reducing valve adjusts the opening, and part of the hydraulic oil of the proportional pressure reducing valve returns to the hydraulic oil tank through the return oil port of the cut-off valve, the oil pressure of the working port is adjusted, and then the braking pressure of the front brake is adjusted.

[0022] Preferably, the pressure of the front brake oil entering from the first output port of the foot brake valve is controlled by the angle of the knob switch, thereby achieving timely adjustment of the front brake pressure; the hydraulic oil enters the rear brake through the second output port of the foot brake valve, and the braking pressure of the rear brake remains unchanged.

[0023] Preferably, when the vehicle is in a state of reduced front braking force, the solenoid valve of the two-position three-way reversing valve shall not be energized, and the input port and the oil return port shall not be connected; the coil of the cut-off valve shall be energized, and the input port and the oil return port of the cut-off valve shall be connected; the coil of the proportional pressure reducing valve shall not be energized, and by adjusting the control port, the input port and the oil return port are partially connected, the rear brake maintains pressure, and the front brake adjusts pressure.

[0024] Preferably, when the vehicle is in a braking state, the engine is running, the pedal of the foot brake valve is pressed, and the hydraulic oil is output through the first output port of the foot brake valve to the input port of the brake control valve block, the solenoid valve of the two-position three-way reversing valve is not energized, the hydraulic oil is output from the input port of the two-position three-way reversing valve to the working port, enters the input port of the proportional pressure reducing, and the hydraulic oil is then output through the working port of the proportional pressure reducing valve to the oil outlet of the brake control valve block to enter the front brake; the coil of the cut-off valve is not energized, the oil return port and the input port of the cut-off valve are not conducting, the input port of the proportional pressure reducing valve is connected to the working port, and at the same time, the hydraulic oil enters the rear brake through the second output port of the foot brake valve.

[0025] Preferably, when the vehicle is in the loaded braking state, the pedal of the foot brake valve is pressed, the solenoid valve of the two-position three-way reversing valve is energized, the input port and the return oil port of the two-position three-way reversing valve are connected, and the hydraulic oil of the two-position three-way reversing valve enters the hydraulic oil tank, so that the pressure oil going to the front brake is cut off by the two-position three-way reversing valve, the front brake does not play a braking role, and the rear brake plays a braking role, thereby realizing the loaded braking of the vehicle.

[0026] The technical effects of the present invention include:

[0027] 1. The present invention improves the original structure and utilizes the principle that the working port of the proportional valve pressure reducing valve is normally connected to the oil return port, so as to timely adjust the maximum braking force of the front brake according to the road conditions, effectively improving the reliability of the braking system and also improving the driving safety of the whole vehicle.

[0028] The present invention enables the mining dump truck to realize that the size of the oil pressure output by the foot brake valve entering the front brake is controlled by the size of the knob switch angle, so that the driver can adjust the size of the front brake pressure in time according to the road conditions, thereby improving the driving safety in rainy and snowy days.

[0029] 2. The present invention enables the driver to adjust the maximum pressure value of the front brake in a timely manner according to the road conditions to prevent the vehicle from skidding.

[0030] 3. The present invention has a reasonable and compact structure, a small size, and is easy to install. All hydraulic valves are installed on the hydraulic control valve block in a threaded plug-in manner, which is convenient for assembly, use and maintenance, and also saves costs.

[0031] 4. The brake integrated control valve of the present invention belongs to an integral integrated valve group, which reduces pipeline connections and leakage points, does not require major improvements to the existing control device, and the method is simple and easy to implement.

[0032] 5. The present invention has a wide adaptability to large-tonnage vehicle models of main engine manufacturers, and can be adapted to vehicles of different tonnages ranging from 50 tons to 150 tons. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural principle diagram of the braking system of a mining dump truck in the prior art;

[0034] Wherein: 101. hydraulic oil tank, 102. hydraulic pump, 103. front brake accumulator one-way valve, 104. rear brake accumulator one-way valve, 105. front brake accumulator, 106. rear brake accumulator, 107. foot brake valve, 108. loading brake valve, 109. front brake half valve, 110. first one-way valve, 111. pressure reducing valve, 112. solenoid reversing valve, 113. second one-way valve, 114. rear brake, 115. front brake;

[0035] Figure 2 It is a structural principle diagram of the brake integrated control valve group in the present invention;

[0036] Among them: 201. brake control valve block, 202. two-position three-way reversing valve, 203. cut-off valve, 204. proportional pressure reducing valve, 205. pressure sensor, 206. controller, 207. knob switch.

[0037] Figure 3 The structural principle diagram of the braking system of the mining dump truck in the present invention.

[0038] Among them: 201 brake control valve block, 202 two-position three-way reversing valve, 203 cut-off valve, 204 proportional pressure reducing valve, 205 pressure sensor, 206 controller, 207 knob switch, 101 hydraulic oil tank, 102 hydraulic pump, 103 front brake accumulator check valve, 104 rear brake accumulator check valve, 105 front brake accumulator, 106 rear brake accumulator, 107 foot brake valve, 114 rear brake, 115 front brake. DETAILED DESCRIPTION

[0039] The following description sufficiently illustrates specific embodiments of the invention to enable those skilled in the art to practice and reproduce the invention.

[0040] like Figure 2 The figure shows the structural principle diagram of the brake integrated control valve group in the present invention.

[0041] The brake integrated control valve group includes: a brake control valve block 201, a two-position three-way reversing valve 202, a cut-off valve 203, a proportional pressure reducing valve 204, a pressure sensor 205, a controller 206, and a knob switch 207.

[0042] The input port (P port) of the two-position three-way reversing valve 202 is connected to the input port (P port) of the brake control valve block 201 through a pipeline, the working port (A port) of the two-position three-way reversing valve 202 is connected to the input port (P port) of the proportional pressure reducing valve 204 through a pipeline, the working port (A port) of the proportional pressure reducing valve 204 is connected to the working port (BF port) of the brake control valve 201 through a pipeline, the oil return port (T port) of the proportional pressure reducing valve 204 is connected to the input port (P port) of the cut-off valve 203 through a pipeline, the oil return port (T port) of the cut-off valve 203 is connected to the oil return port (T port) of the brake control valve block 201 through a pipeline, the oil return ports (T ports) of the two-position three-way reversing valve 202 and the cut-off valve 203 are connected to the oil return port (T port) of the brake control valve block 201 through a pipeline, and the oil return port (T port) of the brake control valve block 201 is connected to the hydraulic oil tank 101 through a pipeline.

[0043] A pressure sensor 205 is installed at the monitoring port (M3 port, M4 port) of the brake control valve 201. The signal output end of the pressure sensor 205 is connected to the signal input end of the controller 206 through a line. The signal output end of the knob switch 207 is connected to the signal input end of the controller 206 through a line. The signal output end of the controller 206 is connected to the control port of the proportional pressure reducing valve 4 through a line.

[0044] According to a further technical solution, the two-position three-way reversing valve 202, the cut-off valve 203 and the proportional pressure reducing valve 204 are all threaded plug-in solenoid valves.

[0045] According to a further technical solution, the two-position three-way reversing valve 202, the cut-off valve 203 and the proportional pressure reducing valve 204 are all integrated in the brake integrated control valve group, and the brake integrated control valve group is an integrated valve group.

[0046] like Figure 3 The figure shows the structural principle diagram of the braking system of the mining dump truck in the present invention.

[0047] The brake integrated control valve group is applied to the braking system of a mining dump truck, which includes: a brake control valve block 201, a two-position three-way reversing valve 202, a cut-off valve 203, a proportional pressure reducing valve 204, a pressure sensor 205, a controller 206, a knob switch 207, a hydraulic oil tank 101, a hydraulic pump 102, a front brake accumulator check valve 103, a rear brake accumulator check valve 104, a front brake accumulator 105, a rear brake accumulator 106, a foot brake valve 107, a rear brake 114, and a front brake 115.

[0048] The oil inlet of the hydraulic pump 102 is connected to the hydraulic oil tank 101 through a pipeline, and the oil outlet is connected to the front brake accumulator check valve 103 and the rear brake accumulator check valve 104 through pipelines respectively; the front brake accumulator check valve 103 is connected to the first oil inlet (P1 port) of the foot brake valve 107 and the front brake accumulator 105 through pipelines respectively; the rear brake accumulator check valve 104 is connected to the second oil inlet (P2 port) of the foot brake valve 107 and the rear brake accumulator 106 through pipelines respectively; the second output port (B2 port) of the foot brake valve 107 is connected to the rear brake 114 through a pipeline; the first output port (B1) of the foot brake valve 107 is connected to the input port (P port) of the brake control valve block 201 through a pipeline, and the working port (BF port) of the brake control valve block 201 is connected to the front brake 115 through a pipeline.

[0049] The hydraulic pump 102 sucks hydraulic oil from the hydraulic oil tank 101, and the output pressure oil is sent to the P1 port and P2 port of the foot brake valve 14 respectively through the front brake accumulator check valve 103 and the rear brake accumulator check valve 104; the pressure oil is sent to the P port of the brake control valve block 201 through the B1 port of the foot brake valve 107, and the pressure oil is sent to the front brake 115 through the BF port; the pressure oil is sent to the rear brake 114 through the B2 port of the foot brake valve 107; the B1 port and B2 port of the foot brake valve 107 are also connected to the front brake accumulator 105 and the rear brake accumulator 106 respectively as a backup pressure oil source.

[0050] The braking method of a mining dump truck includes the following specific steps:

[0051] (1) The vehicle is turned off, the engine is not running, there is no pressurized oil in the brake system, and the entire brake system does not work.

[0052] (2) The vehicle is in the starting state. At this time, the engine drives the hydraulic pump 109 to operate and output pressure oil. The pressure oil enters the foot brake valve 107 through the front brake accumulator check valve 103 and the rear brake accumulator check valve 104. At the same time, the pressure oil enters the front brake accumulator 105 and the rear brake accumulator 106 through the foot brake valve 107; the oil pressure at the P1 port and the P2 port of the foot brake valve 107 continues to increase and is maintained at the set value of the hydraulic pump 102.

[0053] At this time, the solenoid valve of the two-position three-way reversing valve 202 shall not be energized, and the P port and T port of the two-position three-way reversing valve 202 shall not be conductive; the coil of the cut-off valve 203 shall not be energized, and the P port and T port of the cut-off valve 203 shall not be conductive; the coil of the proportional pressure reducing valve 204 shall not be energized, and the P port and T port shall not be conductive.

[0054] (3) The vehicle is in the braking state. At this time, the engine is running. When the pedal of the foot brake valve 107 is pressed, the hydraulic oil is output through the B1 port of the foot brake valve 107 and enters the P port of the brake control valve block 201. The solenoid valve of the two-position three-way reversing valve 202 is not energized. The hydraulic oil is output from the P port of the two-position three-way reversing valve 202 to the A port and enters the P port of the proportional pressure reducing valve 204. The hydraulic oil is then output through the A port of the proportional pressure reducing valve 204 to the BF port of the brake control valve block 201 and enters the front brake 115. Because the coil of the cut-off valve 203 is not energized at this time, the T port and the P port of the cut-off valve 203 are not conducting, so the P port of the proportional pressure reducing valve 204 is directly connected to the A port. At the same time, the hydraulic oil enters the rear brake 114 through the B2 port of the foot brake valve 107.

[0055] At this time, the solenoid valve of the two-position three-way reversing valve 202 shall not be energized, and the P port and T port shall not be conductive; the coil of the cut-off valve 203 shall not be energized, and the P port and T port of the cut-off valve 203 shall not be conductive; the coil of the proportional pressure reducing valve 204 shall not be energized, and the T port and P port of the proportional pressure reducing valve 204 shall not be conductive, and the front brake 115 and the rear brake 114 maintain pressure.

[0056] (4) When the vehicle is in the loading braking state, the pedal of the foot brake valve 107 is pressed, and at the same time, the solenoid valve of the two-position three-way reversing valve 202 is energized, the P port and the T port of the two-position three-way reversing valve 202 are connected, and the pressure oil of the two-position three-way reversing valve 202 enters the hydraulic oil tank 101, so that the pressure oil to the front brake 115 is cut off by the two-position three-way reversing valve 202, and the front brake 115 does not play a braking role. Only the rear brake plays a braking role, thereby realizing the loading braking of the vehicle.

[0057] At this time, the solenoid valve of the two-position three-way reversing valve 202 is energized, and the P port and the T port are connected; the coil of the cut-off valve 203 is not energized, and the P port and the T port of the cut-off valve 203 are not connected; the coil of the proportional pressure reducing valve 204 is not energized, and the T port and the P port are not connected, and the front brake 115 and the rear brake 114 maintain pressure.

[0058] (4) When the front braking force of the vehicle is reduced, the pedal of the foot brake valve 107 is pressed, the solenoid valve of the cut-off valve 203 is energized, and the hydraulic oil enters the P port of the brake control valve block 201 through the B1 port of the foot brake valve 107, and then is output from the P port of the two-position three-way reversing valve 202 to the A port and enters the P port of the proportional pressure reducing valve 204, and then is output to the BF port of the brake control valve block 201 through the A port of the proportional pressure reducing valve 204, and the hydraulic oil enters the front brake 115, and the front brake 115 is braked; at this time, the P port and T port of the cut-off valve 203 are connected, the knob switch 207 is operated, and the controller 206 sends a command to the control port of the proportional pressure reducing valve 204, the proportional pressure reducing valve 204 adjusts its opening, and part of the hydraulic oil of the proportional pressure reducing valve 204 flows back to the hydraulic oil tank 101 through the T port of the cut-off valve 203, adjusting the oil pressure of the A port, and then adjusting the braking pressure of the front brake 115.

[0059] The pressure of the front brake oil entering from the B1 port of the foot brake valve 107 is controlled by the angle of the knob switch 7, so that the front brake pressure can be adjusted in time to improve driving safety in rainy and snowy days; at the same time, the hydraulic oil enters the rear brake 114 through the B2 port of the foot brake valve 107, and the braking pressure of the rear brake 114 remains unchanged.

[0060] At this time, the solenoid valve of the two-position three-way reversing valve 202 shall not be energized, and the P port and T port are not conducting; the coil of the cut-off valve 203 shall be energized, and the P port and T port of the cut-off valve 203 are conducting; the coil of the proportional pressure reducing valve 204 shall not be energized, and by adjusting the control port, the T port and the P port are partially conducting, the rear brake 114 maintains the pressure, and the front brake 115 adjusts the pressure.

[0061] The terms used in the present invention are illustrative and exemplary, rather than restrictive. Since the present invention can be implemented in various forms without departing from the spirit or essence of the technical solution, it should be understood that the above embodiments are not limited to any of the aforementioned details, but should be widely interpreted within the spirit and scope defined by the attached claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the attached claims.

Claims

1. A brake integrated control valve group, characterized in that: include: A brake control valve block, a two-position three-way reversing valve, a cut-off valve, a proportional pressure reducing valve, a pressure sensor, a controller, and a knob switch. The input port of the two-position three-way reversing valve is connected to the input port of the brake control valve block through a pipeline, the working port of the two-position three-way reversing valve is connected to the input port of the proportional pressure reducing valve through a pipeline, the working port of the proportional pressure reducing valve is connected to the working port of the brake control valve through a pipeline, the oil return port of the proportional pressure reducing valve is connected to the input port of the cut-off valve through a pipeline, the oil return port of the cut-off valve is connected to the oil return port of the brake control valve block through a pipeline, the oil return ports of the two-position three-way reversing valve and the cut-off valve are connected to the oil return port of the brake control valve block through a pipeline, and the oil return port of the brake control valve block is connected to the hydraulic oil tank through a pipeline; a pressure sensor is installed at the monitoring port of the brake control valve, the signal output end of the pressure sensor is connected to the signal input end of the controller through a line, the signal output end of the knob switch is connected to the signal input end of the controller through a line, and the signal output end of the controller is connected to the control port of the proportional pressure reducing valve through a line.

2. The brake integrated control valve group according to claim 1, characterized in that: The brake integrated control valve group is an integrated valve group. The two-position three-way reversing valve, cut-off valve and proportional pressure reducing valve are all threaded plug-in solenoid valves integrated in the brake integrated control valve group.

3. A braking system for a mining dump truck using the brake integrated control valve assembly according to claim 1, comprising: The foot brake valve and the front brake are characterized in that the first output port of the foot brake valve is connected to the input port of the brake control valve block through a pipeline, and the working port of the brake control valve block is connected to the front brake through a pipeline.

4. The braking system for a mining dump truck according to claim 3, characterized in that: include: Hydraulic oil tank, hydraulic pump, front brake accumulator check valve, rear brake accumulator check valve, front brake accumulator, rear brake accumulator, foot brake valve, rear brake, front brake, the oil inlet of the hydraulic pump is connected to the hydraulic oil tank through a pipeline, the oil outlet is respectively connected to the front brake accumulator check valve and the rear brake accumulator check valve through pipelines, the front brake accumulator check valve is connected to the first oil inlet of the foot brake valve through a pipeline, the rear brake accumulator check valve is connected to the second oil inlet of the foot brake valve through a pipeline, and the second output port of the foot brake valve is connected to the rear brake through a pipeline.

5. The braking system for a mining dump truck according to claim 4, characterized in that: The front brake accumulator one-way valve is connected to the first oil inlet of the foot brake valve and the front brake accumulator through pipelines, and the rear brake accumulator one-way valve is connected to the second oil inlet of the foot brake valve and the rear brake accumulator through pipelines.

6. A method for braking a mining dump truck using the braking system of claim 3, characterized in that: include: When the vehicle is in the starting state, the engine drives the hydraulic pump to operate and outputs pressure oil, which enters the foot brake valve through the front brake accumulator check valve and the rear brake accumulator check valve. The oil pressure at the first oil inlet and the second oil inlet of the foot brake valve continues to increase and is maintained at the set value of the hydraulic pump. At the same time, the pressure oil enters the front brake accumulator and the rear brake accumulator through the foot brake valve; When the front braking force of the vehicle is reduced, the pedal of the foot brake valve is stepped on, the solenoid valve of the cut-off valve is energized, and the hydraulic oil enters the input port of the brake control valve block through the first output port of the foot brake valve, and then is output from the input port of the two-position three-way reversing valve to the working port and enters the input port of the proportional pressure reducing valve, and then is output to the working port of the brake control valve block through the working oil port of the proportional pressure reducing valve, and the hydraulic oil enters the front brake, and the front brake is braked; At this time, the input port and oil return port of the cut-off valve are connected, the knob switch is operated, and the controller sends a command to the control port of the proportional pressure reducing valve. The proportional pressure reducing valve adjusts the opening, and part of the hydraulic oil of the proportional pressure reducing valve returns to the hydraulic oil tank through the oil return port of the cut-off valve, adjusting the oil pressure of the working port, and then adjusting the braking pressure of the front brake.

7. The braking method for a mining dump truck according to claim 6, characterized in that: The pressure of the front brake oil entering from the first output port of the foot brake valve is controlled by the angle of the knob switch, thereby achieving timely adjustment of the front brake pressure; the hydraulic oil enters the rear brake through the second output port of the foot brake valve, and the braking pressure of the rear brake remains unchanged.

8. The braking method for a mining dump truck according to claim 6, characterized in that: When the vehicle is in the state of reduced front braking force, the solenoid valve of the two-position three-way reversing valve shall not be energized, and the input port and oil return port shall not be connected; the coil of the cut-off valve shall be energized, and the input port and oil return port of the cut-off valve shall be connected; the coil of the proportional pressure reducing valve shall not be energized, and by adjusting the control port, the input port and oil return port are partially connected, the rear brake maintains pressure, and the front brake adjusts pressure.

9. The braking method for a mining dump truck according to claim 6, characterized in that: When the vehicle is in the braking state, the engine is running, the pedal of the foot brake valve is pressed, and the hydraulic oil is output through the first output port of the foot brake valve to the input port of the brake control valve block. The solenoid valve of the two-position three-way reversing valve shall not be energized. The hydraulic oil is output from the input port of the two-position three-way reversing valve to the working port and enters the input port of the proportional pressure reducing. The hydraulic oil is then output through the working port of the proportional pressure reducing valve to the oil outlet of the brake control valve block and enters the front brake. The coil of the cut-off valve shall not be energized, the oil return port and input port of the cut-off valve are not connected, the input port of the proportional pressure reducing valve is connected to the working port, and at the same time, the hydraulic oil enters the rear brake through the second output port of the foot brake valve.

10. The braking method for a mining dump truck according to claim 6, characterized in that: When the vehicle is in the loaded braking state, step on the pedal of the foot brake valve, the solenoid valve of the two-position three-way reversing valve is energized, the input port and the return oil port of the two-position three-way reversing valve are connected, and the hydraulic oil of the two-position three-way reversing valve enters the hydraulic oil tank, so that the pressure oil to the front brake is cut off by the two-position three-way reversing valve, the front brake does not play a braking role, and the rear brake plays a braking role, realizing the loaded braking of the vehicle.

Images