Wet brake, clearance adjusting device and clearance adjusting method of mine truck

Abstract

The invention discloses a gap adjusting device, which comprises a displacement sensor, a controller and a back pressure adjuster, and is characterized in that the displacement sensor is used for measuring the displacement of a piston, forming a displacement signal and reporting the displacement signal to the controller; the back pressure regulator is arranged at the front end of the wet brake, the oil outlet hole is communicated with an oil duct of the wet brake through a pipeline, and the back pressure regulator is used for regulating residual pressure of a piston oil cavity of the wet brake; and the controller is respectively connected with the displacement sensor and the backpressure regulator through wire harnesses, receives the displacement signal from the displacement sensor, and controls the output oil pressure of the backpressure regulator according to the displacement signal. The invention further discloses a gap adjusting device and a gap adjusting method of the wet brake. According to the invention, the gap between the piston and the brake assembly is kept constant, so that the brake performance and safety of the vehicle are kept stable.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of wet brake of mine truck, and particularly relates to a wet brake of mine truck, a gap adjusting device and a gap adjusting method. BACKGROUND

[0002] When the wet brake of mine truck brakes, the piston is pushed to move by high-pressure hydraulic oil to press the brake assembly, and then the brake assembly is mutually rubbed to generate resistance to slow down or stop the vehicle. After braking, the return spring reversely pulls the piston back to the original position to avoid brake drag.

[0003] However, with the continuous friction between the brake assembly, the brake assembly thickness decreases, and the gap between the piston and the brake assembly gradually increases, that is, the stroke of the piston moving to press the brake assembly increases, which will cause the reaction time to increase during braking, and the corresponding braking distance increases, and the safety of the vehicle decreases. SUMMARY

[0004] The purpose of the present application is to provide a wet brake of mine truck, a gap adjusting device and a gap adjusting method, so that the gap between the piston and the brake assembly is kept constant, and the braking performance and safety of the vehicle are kept stable.

[0005] To achieve the above purpose, the technical solution used by the present application is:

[0006] The gap adjusting device comprises a displacement sensor, a controller and a back pressure regulator, wherein

[0007] The displacement sensor is used to measure the displacement of the piston and form a displacement signal, and the displacement signal is reported to the controller;

[0008] The back pressure regulator is arranged at the front end of the wet brake, and the oil outlet hole is communicated with the oil channel of the wet brake through the pipeline, and is used to adjust the residual pressure of the piston oil cavity of the wet brake;

[0009] The controller is connected with the displacement sensor and the back pressure regulator through the wire harness, receives the displacement signal from the displacement sensor, and controls the output oil pressure of the back pressure regulator according to the displacement signal.

[0010] Further, the back pressure regulator comprises a pressure regulating valve and a stepper motor, the pressure regulating valve comprises a base, a valve core and a spring, the base is provided with a seat hole, an oil inlet hole and an oil outlet hole, the oil inlet hole and the oil outlet hole are located on the left side of the seat hole, the seat hole is respectively communicated with the oil inlet hole and the oil outlet hole, a sliding key groove along the axial direction is arranged on the right side of the seat hole, and a threaded hole along the circumferential direction is arranged on the flange on the right side of the base; the valve core is installed in the seat hole of the base, a tapered end is arranged on the left side of the valve core, the tapered surface of the tapered end faces the oil inlet hole, and the left end of the spring is sleeved on the right end of the valve core; the stepper motor comprises a shell, a motor, an end cover, a bearing, a screw rod, a key and a motor bolt; the left side of the shell is provided with a flange, the flange is provided with flange through holes which are uniformly distributed along the circumferential direction; the end cover is connected to the right side of the shell, the motor is installed in the inner cavity of the shell, the motor stator is fixedly connected with the shell, the motor rotor is rotatably supported on the shell and the end cover by means of the bearing, and the motor rotor is provided with a threaded inner hole; the screw rod comprises a rod part and a base part, and the rod part is connected in the threaded inner hole; the base part is connected to the left end of the rod part, and a key groove is arranged on the outer circumferential surface of the base part; the motor bolt passes through the flange through hole and is connected to the threaded hole of the flange, so that the shell and the base are fixedly connected; the base part is installed in the seat hole, and the right end of the spring is sleeved on the base part; the key is installed in the key groove and the sliding key groove, and the controller is connected to the stepper motor through a wire harness.

[0011] Further, a valve core groove is arranged on the outer circumferential surface of the valve core, and a sealing ring is installed in the valve core groove; and the base part is a stepped cylindrical body extending along the circumferential direction.

[0012] The wet brake of the mine car comprises a piston shell and a gap adjusting device, and the piston shell is provided with a stepped hole for installing a displacement sensor.

[0013] Preferably, an internal thread is arranged at the left end of the stepped hole, a measuring rod of the displacement sensor is integrally connected to the piston by means of a sensor bolt, a stepped hole ring groove is arranged on the right side of the stepped hole, and a sealing ring is installed in the stepped hole ring groove and located between the measuring rod and the stepped hole 11c.

[0014] Preferably, an inner wall of the piston shell is provided with a seat cavity for installing a piston at the left end, an oil channel is arranged on the left end surface and communicated with the seat cavity, a closed piston oil cavity is formed between the piston and the piston shell, and the closed piston oil cavity is communicated with the oil channel.

[0015] Preferably, the stepped hole, the screw rod and the valve core of the stepper motor are located on the same central axis.

[0016] The gap adjusting method of the wet brake comprises:

[0017] When the brake is implemented, the high-pressure oil pressure is greater than the valve core opening pressure, the valve core is opened, the oil inlet hole and the oil outlet hole of the pressure regulating valve are communicated, the high-pressure oil enters the piston oil cavity of the wet brake, and the force of the high-pressure oil acting on the piston pushes the piston to move to the right and press the brake assembly;

[0018] When the piston moves to the right, it pulls the measuring rod of the displacement sensor to move to the right, in the process, the displacement sensor measures the clearance change between the piston and the brake assembly, and converts the clearance change into a displacement signal;

[0019] The displacement sensor sends the displacement signal to the controller through the wire harness, the controller compares the measured displacement change with the preset displacement value, controls the output of the stepping motor according to the comparison result, adjusts the residual pressure in the piston oil chamber, and realizes the clearance adjustment between the piston and the brake assembly.

[0020] Preferably, the actual displacement change of the piston > the set displacement, the screw moves to the left, the spring compression increases, and the back pressure pressure increases; 0 < the actual displacement change of the piston ≤ the set displacement, the screw does not act, the spring compression does not change, and the back pressure pressure does not change; the actual displacement change of the piston = 0, the screw moves to the right, the spring compression decreases, and the back pressure pressure decreases.

[0021] Preferably, the displacement value is the maximum clearance value allowed between the piston and the brake assembly, the axial movement of the screw of the stepping motor is adjusted, the spring compression deformation is adjusted, the opening pressure of the valve core is adjusted, the residual pressure in the piston oil chamber is adjusted, the force of the residual pressure and the force of the return spring are balanced, the position of the piston is adjusted, the actual displacement change of the piston ≤ the set displacement and > 0 are maintained, the clearance between the piston and the brake assembly is adjusted, and no braking drag is generated.

[0022] The technical effects of the present application include:

[0023] According to the mine vehicle wet brake clearance adjustment device and adjustment method, the clearance between the piston and the brake assembly can be monitored in real time in each braking, the force of the return spring is balanced by adjusting the residual pressure in the piston oil chamber, the position of the wet brake piston is adjusted, the clearance between the piston and the brake assembly is kept constant, the adjustment precision is high, the stability of the brake reaction time is effectively ensured, and the braking performance and safety of the vehicle are kept stable. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a sectional view of the wet brake in the present application when the wet brake is not braking.

[0025] Figure 2 is a structural schematic view of the clearance adjustment device in the present application;

[0026] Figure 3 is a structural schematic view of the stepping motor in the present application;

[0027] Figure 4 is a control flow chart of the clearance adjustment device in the present application;

[0028] Figure 5 This is a cross-sectional view of the piston of the wet brake in this invention after its position has been adjusted.

[0029] 1-Wet brake; 11-Piston housing, 11a-Seal cavity, 11b-Oil passage, 11c-Stepped bore, 11d-Internal spline; 12-End cover; 13-Connecting collar, 13a-External spline; 14-Piston; 15-Brake assembly, 151-Friction pad, 152-Matching pad; 16-Return assembly, 161-Limit rod, 162-Return spring, 163-Stop pin; 17-Piston seal; 18-End cover bolt;

[0030] 2- Gap adjustment device;

[0031] 3-Displacement sensor, 31-Measuring rod, 32-Sealing ring, 33-Sensor bolt;

[0032] 4-Controller;

[0033] 5-Back pressure regulator;

[0034] 6-Pressure regulating valve; 61-Base; 61a-Seal hole; 61aa-Sliding keyway; 61b-Oil inlet; 61c-Oil outlet; 61d-Flange; 62-Valve core; 63-Sealing ring; 64-Spring.

[0035] 7-Stepper motor, 71-Housing, 71a-Flange, 72-Motor, 721-Stator, 722-Rotor, 73-Screw, 73a-Ring section, 73b-Base, 73ba-Keyway, 74-End cover, 75-Bearing, 76-Key, 77-Motor bolt;

[0036] S - Piston moves to the displacement that presses the brake assembly together; V - Piston oil chamber; O - Center axis. Detailed Implementation

[0037] The following description fully illustrates specific embodiments of the invention to enable those skilled in the art to practice and reproduce it.

[0038] The present invention relates to a detailed description of the specific implementation of the wet brake clearance adjustment device and adjustment method for mining cars. In the following description, the direction along the central axis O is referred to as the "axial direction", the tangent direction at any point rotating around the central axis O is referred to as the "circumferential direction" or "circumferential direction", and the direction intersecting the central axis O and perpendicular to the central axis O is referred to as the "radial direction".

[0039] like Figure 1 The figure shown is a cross-sectional view of the wet brake 1 in this invention when braking is not performed.

[0040] The hub is used to connect the driving wheel, the half shaft is used to connect the frame, the half shaft is arranged in the inner cavity of the hub and connected, and the wet brake 1 is connected between the half shaft and the hub of the mine truck.

[0041] The wet brake 1 comprises a piston housing 11, an end cover 12, a connecting sleeve ring 13, a piston 14, a brake assembly 15, a return assembly 16, a piston seal 17 and an end cover bolt 18.

[0042] The piston housing 11 is a whole annular component, which is a fixed support for other assemblies, and the inner wall left end is provided with a seat cavity 11a for installing the piston, and an oil channel 11b communicating with the seat cavity 11a is arranged on the left side end face, and a first inner spline 11d is arranged on the right side inner periphery surface of the seat cavity 11a. At the same time, a stepped hole 11c for installing the displacement sensor 3 is arranged on the side of the seat cavity 11a of the piston housing 11, and an inner thread is arranged at the left end of the stepped hole 11c. A stepped hole ring groove is arranged on the right side of the stepped hole 11c, and a sealing ring 32 is installed in the stepped hole ring groove.

[0043] The piston 14 is installed in the seat cavity 11a of the piston housing 11 and can move left and right in the seat cavity 11a. The right side of the piston 14 is provided with a piston through hole and a piston threaded hole, and the piston through hole is a counterbore.

[0044] The piston seal 17 is arranged between the piston 14 and the surface of the seat cavity 11a of the piston housing, so as to form a closed piston oil cavity V between the piston 14 and the piston housing 11, and the closed piston oil cavity V is communicated with the oil channel 11b on the piston housing. The inner wall of the seat cavity 11a is provided with a seat cavity ring groove, and the piston seal 17 is installed in the seat cavity ring groove.

[0045] The end cover 12 is fixedly connected with the piston housing 11 by means of the end cover bolt 18. The right side end face of the piston housing 11 is provided with a housing threaded hole, the end cover 12 is provided with an end cover through hole, the bolt 18 passes through the end cover through hole and is connected with the housing threaded hole, so as to integrally fix and connect the end cover 12 and the piston housing 11.

[0046] The connecting sleeve ring 13 is annular structure, the connecting sleeve ring 13 is a rotating member, and the outer periphery surface is provided with a second outer spline 13a. The connecting sleeve ring 13 is provided with a sleeve ring through hole, and the connecting bolt passes through the sleeve ring through hole to connect the hub, so as to realize the power transmission of the driving wheel.

[0047] Brake assembly 15 is arranged between the piston 14 and the cover 12, on the right side of the piston 14, comprising: a plurality of pairs of sheets 152 and friction sheets 151, the outer periphery of the pair of sheets 152 is provided with a first outer spline, and the inner periphery of the friction sheet 151 is provided with a second inner spline. The pair of sheets 152 is a non-rotating part, and the friction sheet 151 is a rotating part. The first outer spline of the pair of sheets 152 is connected with the inner spline 11d of the piston shell 11 in a form that can move axially; the friction sheet 151 is connected with the drive wheel outer spline 13a in a form that can move axially.

[0048] The return mechanism 16 is arranged outside the seat cavity 11a, between the piston shell 11 and the piston 14, comprising: a limiting rod 161, a return spring 162, and a stop pin 163.

[0049] The limiting rod 161 is provided with an end and a pin hole at both ends.

[0050] The piston shell 11 is provided with a shell through hole (inner hole side), and the small end of the limiting rod 161 extends into the counterbore on the right side of the piston 14 through the shell through hole of the piston shell 11 and the piston through hole of the piston 14. The return spring 162 is sleeved on the limiting rod 161 and located between the end and the shell through hole. The stop pin 163 is installed in the pin hole and located in the counterbore of the piston through hole, so as to realize the axial limiting of the limiting rod 161. The elastic force of the return spring 162 makes the piston 14 return to the left when the braking is finished.

[0051] As shown in Figure 2 , it is a structure schematic diagram of the gap adjusting device 2 in the application; as shown in Figure 3 , it is a structure schematic diagram of the step motor 7 in the application.

[0052] The gap adjusting device 2 of the wet brake of the mine car comprises: a displacement sensor 3, a controller 4, and a back pressure regulator 5.

[0053] The displacement sensor 3 is installed on the stepped hole 11c of the wet brake 1 by means of threads, is used for measuring the displacement of the piston 14 and forming a displacement signal, reports the displacement signal to the controller, the measuring rod 31 is integrally connected with the piston 14 by means of the sensor bolt 33, and the sealing ring 32 is arranged between the measuring rod 31 and the stepped hole 11c of the wet brake.

[0054] The back pressure regulator 5 is arranged at the front end of the wet brake 1, is used for adjusting the residual pressure of the piston oil chamber V, and comprises: a pressure regulating valve 6 and a step motor 7. The pressure regulating valve 6 comprises: a base 61, a valve core 62, a sealing ring 63, and a spring 64.

[0055] The base 61 is provided with a seat hole 61a, an oil inlet hole 61b, and an oil outlet hole 61c. The oil inlet hole 61b and the oil outlet hole 61c are located to the left of the seat hole 61a. The seat hole 61a is connected to the oil inlet hole 61b and the oil outlet hole 61c respectively. A sliding keyway 61aa is provided on the right side of the seat hole 61a along the axial direction. Threaded holes are provided on the flange 61d on the right side of the base 61 along the circumferential direction.

[0056] The valve core 62 is mounted in the base seat hole 61a in a form that allows it to move axially. A tapered end is provided on the left side of the valve core 62, with the tapered surface of the tapered end facing the oil inlet hole 61b. A valve core groove is provided on the outer circumferential surface of the valve core 62, and a sealing ring 63 is installed in the valve core groove for sealing between the valve core 62 and the base seat hole 61a.

[0057] The left end of the spring 64 is fitted onto the right end of the valve core 62 and is located on the right side of the tapered end; the spring 64 is a compression spring and is set in the base seat hole 61a.

[0058] The stepper motor 7 includes: a housing 71, a motor 72, an end cover 74, a bearing 75, a screw 73, a key 76, and a motor bolt 77. The housing 71 has a flange 71a on its left side, and the flange 71a is provided with flange through holes evenly distributed in the circumferential direction.

[0059] The end cap 74 is integrally fixedly connected to the right side of the housing 71. The motor 72 is installed in the inner cavity of the housing. The motor stator 721 is integrally fixedly connected to the housing 71. The motor rotor 722 is supported on the housing 71 and the end cap 74 in a rotatable manner by means of the bearing 75. The motor rotor 722 is provided with a threaded inner hole.

[0060] The screw 73 includes a rod portion 73a and a base portion 73b. The rod portion 73a is installed in the threaded inner hole of the motor rotor 722, and the external thread of the rod portion 73a engages with the internal thread of the threaded inner hole. The base portion 73b is connected to the left end of the rod portion 73a. The base portion 73b is a stepped cylinder extending in the circumferential direction, and a keyway 73ba is provided on its outer circumferential surface.

[0061] The motor bolt 77 passes through the flange through hole and connects to the threaded hole of the flange 61d, thus fixing the housing 71 of the stepper motor 7 to the base 61 integrally.

[0062] The base 73b of the screw 73 is installed in the seat hole 61a, and the right end of the spring 64 is fitted onto the base 73b. The key 76 is disposed in the keyway 73ba of the base 73b, and at the same time, the key 76 is installed in the sliding keyway 61aa of the seat hole 61a.

[0063] like Figure 4 The diagram shown is a control flowchart of the gap adjustment device 2 in this invention.

[0064] The controller 4 is connected with the displacement sensor 3 and the stepping motor 7 of the back pressure regulator 5 through the wire harness, receives the displacement signal from the displacement sensor 3, controls the output of the stepping motor 7 according to the displacement signal of the displacement sensor 3, and the stepping motor 7 adjusts the opening of the pressure regulating valve 6.

[0065] The oil inlet hole 61b of the pressure regulating valve 6 of the back pressure regulator 5 is connected with the high pressure oil through the pipeline, the oil outlet hole 61c is connected with the oil channel 11b of the wet brake 1 through the pipeline, the valve core 62 of the pressure regulating valve 6 is pressed on the left edge of the oil inlet hole 61b by the spring 64, and the oil inlet hole 61b and the oil outlet hole 61c of the pressure regulating valve 6 are disconnected.

[0066] The axial force of the spring 64 on the valve core 62 determines the opening pressure of the valve core 62, that is, the back pressure of the back pressure regulator 5, that is, the residual pressure of the piston oil chamber V of the wet brake 1, and the axial force of the spring 64 is determined by the compression deformation amount of the spring 64.

[0067] The screw rod 73 of the stepping motor 7 is connected with the motor rotor 722 through threads, and the screw rod 73 is limited in the circumferential direction by the key 76. When the motor rotor 722 rotates, the screw rod 73 can only move in the axial direction, and correspondingly, when the motor rotor 722 does not rotate, the screw rod 73 remains fixed in the axial direction. The axial movement of the screw rod 73 of the stepping motor 7 controls the compression deformation amount of the spring 64, that is, controls the axial pressing force of the spring 64 on the valve core 62, that is, controls the opening pressure of the valve core 62, and correspondingly, controls the setting of the back pressure of the back pressure regulator 5 and the residual pressure of the piston oil chamber V.

[0068] The seat hole 61a of the stepping motor 7, the screw rod 73 and the valve core 62 are located on the same center axis O.

[0069] As shown in Figure 5 FIG. 2 is a sectional view of the wet brake 1 after the position of the piston 14 is adjusted.

[0070] The gap adjusting method of the wet brake of the mine car comprises the following steps:

[0071] Step 1: When the brake is implemented, the high pressure oil pressure is greater than the opening pressure of the valve core 62, the valve core 62 moves to the right, that is, the valve core 62 is opened, the oil inlet hole 61b and the oil outlet hole 61c of the pressure regulating valve 6 are communicated, the high pressure oil enters the piston oil chamber V of the wet brake 1, and the force of the high pressure oil acting on the piston 14 pushes the piston to move to the right and press the brake assembly 15;

[0072] Step 2: When the piston 14 moves right, the measuring rod 31 of the displacement sensor 3 is pulled to move right, in the process, the displacement sensor 3 measures the displacement change S of the piston 14 from the initial position to the compression of the brake assembly 15, that is, the clearance change between the piston 14 and the brake assembly 15, and converts the clearance change into a displacement signal;

[0073] When the brake is released, the piston 14 returns to the initial position under the action of the return assembly 16.

[0074] Step 3: The displacement sensor 3 sends the displacement signal to the controller 4 through the wire harness, and the controller 4 compares the measured displacement change S with the pre-set displacement value, controls the output of the stepping motor 7 according to the comparison result, adjusts the residual pressure of the piston oil chamber V, and realizes the clearance adjustment between the piston 14 and the brake assembly 15.

[0075] The controller 3 has a pre-set displacement value, which is the maximum value of the wet brake 1 without drag and acceptable reaction time, that is, the maximum clearance value allowed between the piston 14 and the brake assembly 15. The controller 4 compares the measured displacement change S with the pre-set displacement value as follows, and then controls the output of the stepping motor 7 according to the result, adjusts the position of the valve core 62, the adjusting back pressure of the back pressure regulator 5, and the residual pressure of the piston oil chamber V is adjusted.

[0076]

[0077] By adjusting the axial movement of the screw rod 73 of the stepping motor 7, the compression deformation amount of the spring 64 is adjusted, the force of the spring 64 is adjusted, the opening pressure of the valve core 62 is adjusted, the residual pressure in the piston oil chamber V of the wet brake 1 is adjusted, the force of the piston 14 and the force of the return spring 162 are balanced, and the position of the piston 14 is adjusted, that is, the actual displacement of the piston 14 is ≤ the set displacement, and > 0, that is, the clearance between the piston 14 and the brake assembly 15 is automatically adjusted, and no brake drag is generated.

[0078] The gap adjusting device 2 of the wet brake 1 related to the present application realizes the adjustment of the position of the piston 14 of the wet brake 1 by monitoring the clearance between the piston 14 and the brake assembly 15 in real time in each braking, balancing the force of the return spring by adjusting the residual pressure of the piston oil chamber V, and the adjustment accuracy is high, which effectively ensures the stability of the brake reaction time.

[0079] The terms used in the present application are illustrative and exemplary, rather than limiting terms. Since the present application can be implemented in various forms without departing from the spirit or essential characteristic thereof, it should also be understood that the above-described embodiments are not limited by any of the foregoing disclosure, but are widely interpreted, falling within the spirit and scope of the appended claims, whereby all changes and modifications thereto belong to the scope of the following claims.

Claims

1. A gap adjusting device, characterized by, include: Displacement sensor, controller, back pressure regulator, among which The displacement sensor is used to measure the displacement of the piston and generate a displacement signal, which is then reported to the controller. The back pressure regulator is located at the front end of the wet brake. Its oil outlet is connected to the oil passage of the wet brake through a pipeline. It is used to regulate the residual pressure in the piston oil chamber of the wet brake. The controller is connected to the displacement sensor and the back pressure regulator via wiring harnesses. It receives displacement signals from the displacement sensor and controls the output oil pressure of the back pressure regulator based on the displacement signals.

2. The gap adjusting device of claim 1, wherein The back pressure regulator includes a pressure regulating valve and a stepper motor. The pressure regulating valve includes a base, a valve core, and a spring. The base has a seat hole, an oil inlet hole, and an oil outlet hole. The oil inlet hole and oil outlet hole are located on the left side of the seat hole, and the seat hole connects to the oil inlet hole and the oil outlet hole, respectively. An axial sliding keyway is provided on the right side of the seat hole. Threaded holes are evenly distributed circumferentially on the flange on the right side of the base. The valve core is installed in the seat hole of the base. A tapered end is provided on the left side of the valve core, with the tapered surface of the tapered end facing the oil inlet hole. The left end of the spring is fitted onto the right end of the valve core. The stepper motor includes a housing, a motor, an end cover, a bearing, a screw, a key, and motor bolts. A flange is provided on the left side of the housing. The flange has circumferentially distributed flange through holes; the end cover is connected to the right side of the housing; the motor is installed in the inner cavity of the housing; the motor stator is fixedly connected to the housing; the motor rotor is supported by bearings on the housing and end cover in a rotating manner; the motor rotor has a threaded inner hole; the screw includes a shank and a base, the shank being connected to the threaded inner hole; the base is connected to the left end of the shank, and a keyway is provided on the outer circumferential surface of the base; the motor bolt passes through the flange through holes and connects to the threaded holes of the flange, fixing the housing and the base; the right end of the spring is fitted onto the base in the mounting hole; the key is installed in the keyway and sliding keyway; the controller is connected to the stepper motor via a wiring harness.

3. The gap adjusting device of claim 2, wherein The outer circumferential surface of the valve core is provided with a valve core groove, and the sealing ring is installed in the valve core groove. The base is a stepped cylinder extending in the circumferential direction.

4. A wet brake of a mine truck, characterized in that include: The piston housing and the gap adjustment device according to any one of claims 1-3, wherein the piston housing is provided with a stepped hole for mounting a displacement sensor.

5. The wet brake of the mine truck according to claim 4, characterized in that, The left end of the stepped hole is provided with an internal thread. The measuring rod of the displacement sensor is integrally connected to the piston by means of a sensor bolt. The right side of the stepped hole is provided with a stepped hole annular groove. The sealing ring is installed in the stepped hole annular groove and is located between the measuring rod and the stepped hole 11c.

6. The wet brake of the mine truck according to claim 4, wherein The piston housing has a seat cavity for mounting the piston on the left end of its inner wall, and an oil passage connecting the seat cavity is provided on the left end face. A closed piston oil cavity is formed between the piston and the piston housing, and the closed piston oil cavity is connected to the oil passage.

7. The wet brake of the mine truck according to claim 4, wherein The stepper motor's mounting hole, screw, and valve core are located on the same central axis.

8. The method of adjusting the clearance of a wet brake of a mining vehicle as claimed in claim 4, wherein, include: When braking is applied, if the high-pressure oil pressure is greater than the valve core opening pressure, the valve core opens, and the oil inlet and outlet of the pressure regulating valve are connected. The high-pressure oil enters the piston oil chamber of the wet brake, and the force applied by the high-pressure oil to the piston pushes the piston to the right and presses the brake assembly. When the piston moves to the right, the measuring rod of the displacement sensor is pulled to move to the right, in the process, the displacement sensor measures the clearance change between the piston and the brake assembly, and converts the clearance change into a displacement signal; The displacement sensor sends the displacement signal to the controller through the wire harness, the controller compares the measured displacement change with the preset displacement value, controls the output of the stepping motor according to the comparison result, adjusts the residual pressure in the piston oil chamber, and realizes the clearance adjustment between the piston and the brake assembly.

9. The method of adjusting the clearance of a wet brake of a mining vehicle as claimed in claim 8, wherein, The actual displacement change of the piston > the set displacement, the screw moves to the left, the spring compression increases, and the back pressure pressure increases. 0 < the actual displacement change of the piston ≤ the set displacement, the screw does not act, the spring compression does not change, and the back pressure pressure does not change; the actual displacement change of the piston = 0, the screw moves to the right, the spring compression decreases, and the back pressure pressure decreases.

10. The method of adjusting the clearance of a wet brake of a mining vehicle as claimed in claim 8, wherein, The displacement value is the maximum clearance value allowed between the piston and the brake assembly, by adjusting the axial movement of the screw of the stepping motor, adjusting the spring compression deformation, and then adjusting the opening pressure of the valve core, adjusting the residual pressure in the piston oil chamber, the residual pressure and the action force of the return spring are balanced, and then the adjustment of the piston position is realized, the actual displacement change of the piston ≤ the set displacement, and > 0, the clearance between the piston and the brake assembly is adjusted, and no brake drag is generated.

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