CN113685468B - Detection apparatus for remaining thickness of brake lining - Google Patents

Abstract

The invention discloses a detection device for the remaining thickness of a brake pad, which relates to the technical field of detection devices, and comprises a mounting case, a driving element and a distance measuring rod, and one side of the outer wall of the mounting case is used to be installed on the back plate of the brake pad On the side wall of the mounting shell, which is used to be close to the brake disc, there is a protruding hole. The driving element is installed in the mounting shell, and the output shaft of the driving element is connected to one end of the distance measuring rod. The driving element can drive The distance-measuring rod extends out of the mounting shell through the protruding hole until the end of the distance-measuring rod bears against the brake disc. The detection device for the remaining thickness of the brake pad can perform in-situ detection of the remaining thickness of the brake pad, and has high detection efficiency.

Description

A detection device for remaining thickness of brake pad

technical field

The invention relates to the technical field of detection devices, in particular to a detection device for the remaining thickness of a brake pad.

Background technique

The basic braking system of the train plays an indispensable role in the entire braking process. Especially in the case of train electric braking failure, the basic braking will become the only braking method. According to relevant standards, the brake pads If the remaining thickness reaches the limit and continues to be used, the foundation brake may fail, and the safe operation of the train cannot be guaranteed. Therefore, the "remaining thickness after brake pad braking" is a very important indicator for evaluating whether the foundation brake performance of the train can work normally.

The current remaining thickness detection of the brake pads can only be performed by removing the brake pads during maintenance, then manually measuring, and finally reinstalling. Although this method can obtain more accurate result data of the remaining thickness of the brake pad, it obviously requires a huge amount of manpower, material resources, time and other related resources, and it is necessary to control the size of the pretightening force again when reinstalling, and it is necessary to verify the performance. Whether the brake disc is successfully clamped for braking, and secondly, the installation process will reduce the life of the bolts used to a certain extent, thereby reducing the service life of the entire brake pad. In addition, according to relevant reports, there is still no effective detection method for whether each brake pad is exactly fitted to the brake disc during the braking process of the train when it reaches the foundation brake, and it cannot be repaired in time, which aggravates the The wear amount of the remaining brake pads is reduced, and the temperature rise of these brake pads and brake discs is also affected. Eventually, the brake pads and brake discs cannot be replaced uniformly and synchronously, which affects the safety of the vehicle. And the braking air pressure of the cylinder is greatly wasted when part of the brake pads fails to fit the brake disc.

Contents of the invention

The object of the present invention is to provide a detection device for the remaining thickness of the brake pad to solve the above-mentioned problems in the prior art, capable of in-situ detection of the remaining thickness of the brake pad, and the detection efficiency is high.

To achieve the above object, the present invention provides the following scheme:

The invention provides a detection device for the remaining thickness of the brake pad, which includes a mounting case, a driving element and a distance measuring rod, one side of the outer wall of the mounting case is used to be installed on the back plate of the brake pad, and the An extension hole is provided on the side wall of the mounting shell close to the brake disc, the driving element is installed in the mounting shell, and the output shaft of the driving element is in transmission with one end of the distance measuring rod. connected, the driving element can drive the distance-measuring rod to protrude from the mounting shell through the protruding hole until the end of the distance-measuring rod is against the brake disc.

Preferably, the outer wall of the distance measuring rod is provided with threads, the inner wall of the extending hole is provided with threads, the distance measuring rod is threaded with the extending hole, and the driving element is slidably connected to the mounting Inside the housing, and the driving element can drive the distance measuring rod to rotate, and make the distance measuring rod drive the driving element to slide towards or away from the brake disc.

Preferably, a chute is fixed on the inner bottom surface of the installation shell, a rail frame is slidably connected in the chute, the driving element is installed on the rail frame, and the driving element can follow the rail frame along the The chute slides.

Preferably, a photoelectric counter is also fixed on the guide rail frame, a light-emitting element is fixed on the inner wall of the installation shell, the photoelectric counter can receive the light emitted by the light-emitting element, and the photoelectric counter is fixed on the guide rail frame At least one light-shielding sheet is fixed on the outer wall of the distance-measuring rod, the light-emitting element and the photoelectric counter are respectively located on both sides of the light-shielding sheet, and the distance-measuring rod can Drive the shading sheet to rotate, and make the shading sheet rotate to block the photoelectric counter from receiving the light emitted by the light emitting element.

Preferably, a bracket is also fixed on the guide rail frame, the bracket is fixed between the driving element and the photoelectric counter, the upper end of the bracket is provided with a mounting hole, and a transmission assembly is rotatably installed in the mounting hole , one end of the distance-measuring rod is in transmission connection with the output shaft of the driving element through the transmission assembly.

Preferably, the transmission assembly includes a left clip, a right clip and a bearing, the left clip is fixedly sleeved on the output shaft of the drive element, and the right clip is fixedly sleeved on the The outer circumference of the distance measuring rod, and the left clamping part and the right clamping part can be engaged, the bearing is coaxially sleeved on the outer circumference of the right clamping part, and the right clamping part can be The bearings rotate within.

Preferably, an elastic element is fixed on the end of the driving element away from the distance measuring rod, and the end of the elastic element away from the driving element is fixed on the inner wall of the rail frame, and the driving element is slidably connected to the On the guide rail frame, the limit switch is fixed on the guide rail frame, and the driving element and the photoelectric counter are both electrically connected to the limit switch. In the initial state, the end of the guide rail frame away from the photoelectric counter contacts The inner wall of the housing is installed, and the elastic element is in a compressed state.

Preferably, a circle of left ratchets is fixed on the left clip close to the end of the right clip, and a circle of right ratchets is fixed on the end of the right clip close to the left clip; When the driving element is driven by the elastic element and rotates toward the direction in which the left ratchet and the right ratchet tend to separate, the left clip and the right clip are always attached and rotate synchronously, And drive the distance-measuring rod to extend out of the protruding hole; when the distance-measuring rod contacts the brake disc, the right clamping part cannot rotate, and the left clamping part continues to rotate and closes on the right ratchet. Under the action of the ramp tooth surface, the drive element moves in the direction of compressing the elastic element. When the elastic element is compressed to the shortest distance, the drive element can touch the limit switch and pass through the The limit switch controls the drive element to stop, and at the same time the limit switch controls the photoelectric counter to output counting information; The left clamping piece and the right clamping piece are clamped and rotated synchronously, and drive the distance measuring rod to move away from the brake disc until the end of the guide rail frame away from the photoelectric counter contacts the The inner wall of the housing is installed, and the end of the distance measuring rod away from the driving element contacts the protruding hole, and at the same time, the photoelectric counter outputs counting information.

Preferably, a heat insulating gasket is fixed on the outer wall of the installation shell for fixing with the brake pad back plate, and the heat insulating pad is used to prevent the heat from the brake pad back plate from being transferred to the brake pad back plate. Install on the shell.

Preferably, the drive element is an electric motor.

Compared with the prior art, the present invention has achieved the following technical effects:

In the detection device for the remaining thickness of the brake pad provided by the present invention, a protruding hole is opened on the side wall of the mounting shell for being close to the brake disc, the driving element is installed in the mounting shell, and the output shaft of the driving element is connected to the measuring One end of the distance rod is connected by transmission, and the driving element can drive the distance rod through the extension hole to extend out of the installation shell until the end of the distance rod touches the brake disc, and then measure the length of the distance rod, and then subtract the back The thickness of the plate is to obtain the remaining thickness of the brake pad, and realize the measurement of the remaining thickness of the brake pad. Carry out in-situ measurement without removing the brake pads, avoid bolt wear caused by repeated disassembly and assembly of brake pads, and incomplete fit of brake pads and brake discs during re-installation accelerates wear and affects braking performance. motion effect.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the embodiments. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

Fig. 1 is a schematic structural view of a detection device for the remaining thickness of a brake pad provided by the present invention;

Fig. 2 is a front view of the remaining thickness of the brake pad in Fig. 1;

Fig. 3 is a schematic diagram of the structure of the left clamping part and the right clamping part in the detection device for the remaining thickness of the brake pad provided by the present invention;

Fig. 4 is a flow chart when the detection device for the remaining thickness of the brake pad provided by the present invention is working;

In the figure: 100-the detection device for the remaining thickness of the brake pad, 1-installation shell, 2-shading plate, 3-distance measuring rod, 4-bracket, 5-bearing, 6-left clip, 7-driving element , 8-rail frame, 9-insulation spacer, 10-photoelectric counter, 11-elastic element, 12-right clip, 13-left ratchet, 14-right ratchet.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The purpose of the present invention is to provide a detection device for the remaining thickness of the brake pads, so as to solve the problem that the detection of the remaining thickness of the existing brake pads requires the removal of the brake pads, which is inconvenient for detection and affects the Technical issues of service life.

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figures 1-2, the present invention provides a detection device 100 for the remaining thickness of the brake pad, which is used for in-situ measurement of the brake pad, including a mounting shell 1, a driving element 7 and a distance measuring rod 3 , the mounting shell 1 is provided with a protruding hole on the side wall close to the brake disc, the driving element 7 is installed in the mounting shell 1, and the output shaft of the driving element 7 is in transmission connection with one end of the distance measuring rod 3, and the driving The element 7 can drive the distance measuring rod 3 to extend out of the installation shell 1 through the extension hole until the end of the distance measuring rod 3 touches the brake disc, and then measure the length of the distance measuring rod 3, and then subtract the thickness of the back plate , that is, to obtain the remaining thickness of the brake pad, and realize the measurement of the remaining thickness of the brake pad. Position measurement without removing the brake pads, avoiding the bolt wear caused by repeated disassembly and assembly of the brake pads, and the incomplete fit of the brake pads and the brake disc when reinstalling accelerates the wear rate and affects the braking effect .

Specifically, the outer wall of the distance measuring rod 3 is provided with threads, and the inner wall of the extending hole is provided with threads, and the distance measuring rod 3 is threadedly connected with the extending hole, and then the distance measuring rod 3 is supported by the inner wall of the extending hole. At the same time, the rotation and axial movement of the distance measuring rod 3 are also realized through threaded connection, and the driving element 7 is slidably connected in the installation shell 1. When the driving element 7 drives the distance measuring rod 3 to rotate, because the distance measuring rod 3 and the extension hole The threaded connection makes the distance measuring rod 3 move toward the direction extending out of the installation shell 1, and then drives the driving element 7 to slide toward or away from the brake disc, so as to measure the remaining thickness of the brake pad.

The inner bottom surface of the installation shell 1 is fixed with a chute, and a guide rail frame 8 is slidably connected in the chute, and the drive element 7 is installed on the guide rail frame 8, and the drive element 7 can follow the guide rail frame 8 to slide along the chute, which plays a role in moving. The axial positioning function of each part also reduces the working resistance of the driving element 7 and the distance measuring rod 3, and reduces energy consumption.

A photoelectric counter 10 is also fixed on the guide rail frame 8, a light-emitting element is fixed on the inner wall of the installation shell 1, the photoelectric counter 10 can receive the light emitted by the light-emitting element, and the photoelectric counter 10 is fixed on the guide rail frame 8 for being close to one end of the brake disc , and then avoid the driving element 7 from affecting the light reception of the photoelectric counter 10, at least one light-shielding sheet 2 is fixed on the outer wall of the distance-measuring rod 3, and each light-shielding sheet 2 is fixed at different positions in the circumferential direction of the distance-measuring rod 3, preferably, The number of shading sheets 2 is two, and the light-emitting element and the photoelectric counter 10 are respectively located on both sides of the shading sheet 2. The distance measuring rod 3 can drive the shading sheet 2 to rotate, and make the shading sheet 2 rotate to block the photoelectric counter 10 from receiving the light emitting element. light, and then make the shading sheet 2 block the light once, the photoelectric counter 10 will count a number, and the final reading of the photoelectric counter 10 matches the number of the shading sheets 2 on the periphery of the distance measuring rod 3, and the thread guide on the periphery of the distance measuring rod 3 The protruding length of the distance-measuring rod 3 is obtained through calculation, and then the remaining thickness of the brake pad is obtained.

Also be fixed with support 4 on the guide rail frame 8, support 4 is fixed between drive element 7 and photoelectric counter 10, the upper end of support 4 is provided with mounting hole, rotates and installs a transmission assembly in the mounting hole, and one end of distance-measuring rod 3 and drive The output shaft of the element 7 is connected through the transmission assembly, and the transmission assembly is installed and supported by the bracket 4, so as to realize the connection between the output shaft of the drive element 7 and the distance measuring rod 3, so as to facilitate the stable driving of the distance measuring rod 3 by the drive element 7 .

As shown in Figure 3, the transmission assembly includes a left clip 6, a right clip 12 and a bearing 5, preferably, the left clip 6 and the right clip 12 are both ratchets, and the ratchets on the two ratchets Can be engaged, the left clip 6 is fixedly sleeved on the output shaft of the drive element 7, and the left clip 6 can rotate synchronously with the output shaft of the drive element 7, and the right clip 12 is fixedly sleeved on the distance measuring rod 3 , and the right clip 12 can rotate synchronously with the distance measuring rod 3, the left clip 6 and the right clip 12 can be engaged, the bearing 5 is coaxially sleeved on the outer periphery of the right clip 12, and the right clip The connecting piece 12 can rotate in the bearing 5, so as to ensure the support of the transmission assembly, it will not affect the rotation of the transmission assembly.

An elastic element 11 is fixed on the end of the driving element 7 away from the distance measuring rod 3, and the end of the elastic element 11 away from the driving element 7 is fixed on the inner wall of the guide rail frame 8, and the driving element 7 is slidably connected to the guide rail frame 8, which is fixed on the guide rail frame The limit switch, the driving element 7 and the photoelectric counter 10 are all electrically connected to the limit switch, and then the opening or closing of the driving element 7 can be controlled by the limit switch, and the opening and closing and data output of the photoelectric counter 10 can be controlled by the limit switch. In the initial state, the end of the guide rail frame 8 away from the photoelectric counter 10 contacts the inner wall of the installation shell 1, and the elastic element 11 is in a compressed state, which is convenient to squeeze the left clip 6 through the elastic restoring force of the elastic element 11, so that the left clip is connected. Part 6 fits with the right clamping part 12, and at the same time, the end of the distance measuring rod 3 away from the driving element 7 contacts the protruding hole, thereby facilitating the reset of each element.

A circle of left ratchets 13 is fixed on the left clip 6 near the end of the right clip 12, and a circle of right ratchets 14 is fixed on the right clip 12 near the end of the left clip 6; When the left ratchet 13 and the right ratchet 14 are driven by 11 to rotate in the direction in which the left ratchet 13 and the right ratchet 14 tend to separate, the left clip 6 and the right clip 12 are always attached and rotated synchronously under the action of extrusion force and friction force, and then Realize that the driving element 7 drives the left clamping part 6 to rotate, the left clamping part 6 and the right clamping part 12 rotate, the right clamping part 12 drives the distance measuring rod 3 to rotate, and makes the distance measuring rod 3 extend out of the hole, and simultaneously drives the The element 7 is also driven to move in the direction close to the protruding hole; when the distance measuring rod 3 touches the brake disc, the distance measuring rod 3 and the right clip 12 cannot rotate under the restriction of the brake disc, and the left clip 6 continues to rotate. Rotate and drive the driving element 7 to move in the direction of compressing the elastic element 11 under the action of the slope tooth surface of the right ratchet 14, that is, in the process, the tooth top of the left clamping part 6 moves from the tooth root of the right clamping part 12 Move to the tooth top of the right clip 12, and the left clip 6 and the right clip 12 do not disengage from all the time, when the elastic element 11 is compressed to the shortest distance, the driving element 7 moves to touch the limit switch, and The limit switch controls the drive element 7 to stop, and at the same time the limit switch controls the photoelectric counter 10 to output counting information, and then calculates the unscrewed length of the distance measuring rod 3, and finally obtains the remaining thickness of the brake pad, realizing the first time Measurement: When the driving element 7 rotates towards the direction in which the left ratchet 13 and the right ratchet 14 are engaged, that is, when the driving element 7 rotates towards the direction opposite to the initial rotation direction, it can drive the left clamping member 6 and the right clamping member 12 Clamping (that is, the ratchet engagement of the left clamping piece 6 and the right clamping piece 12) and synchronous rotation, and then drive the distance measuring rod 3 to move away from the brake disc to the end of the guide rail frame 8 away from the photoelectric counter 10. Install the inner wall of the shell 1, and the end of the distance measuring rod 3 far away from the driving element 7 contacts the protruding hole to realize the reset of the distance measuring rod 3. At the same time, the photoelectric counter 10 outputs the counting information, and then calculates the distance measuring rod through the count value and other data. 3. For the length of the return trip, calculate the more accurate remaining thickness of the brake pad by calculating the two lengths through the weighted average method, and realize the second measurement. Preferably, as shown in Figure 4, the above calculation method can be directly performed by a computer program, and then the calculated remaining thickness of the brake pad is compared with the initial thickness value and the last measurement value, so as to improve the accuracy of the measurement results and the real-time monitoring of the remaining thickness. The above distance measuring process is fast and easy to operate. Therefore, those skilled in the art can perform multiple measurements to ensure the accuracy of the measurement results. During this process, the elastic element 11 can not only provide a buffer protection function, but also realize the reset of the driving element 7, so as to be used for the next measurement. Preferably, the elastic element 11 is a spring.

The mounting shell 1 is fixed with a heat insulating gasket 9 on the outer wall that is used to fix the brake pad back plate, and the heat insulating pad 9 is used to prevent the heat on the brake pad back plate from being transferred to the mounting shell 1, and then Prevent the heat generated during the braking process from being transferred to the photoelectric counter 10, which will affect the counting accuracy and further affect the measurement of the remaining thickness of the brake pad.

The drive element 7 is an electric motor.

After the first measurement is completed, use the final reading n ₁ of the photoelectric counter 10, the number w of the shading sheets 2 on the periphery of the distance measuring rod 3, and the thread lead l on the periphery of the distance measuring rod 3 to calculate the distance measuring rod 3 advance distance s ₁ :

After the second measurement is completed, use the final reading _n2 of the photoelectric counter 10, the number w of the shading sheets 2 on the periphery of the distance measuring rod 3, and the thread lead l on the periphery of the distance measuring rod 3 to calculate the distance measuring rod 3 The retraction distance s ₂ :

Use the weighted average method to calculate the remaining thickness d of the brake pad:

d＝a ₁ s ₁ +a ₂ s ₂

The amount of wear d _i of the brake pad:

d _i =s-(a ₁ s ₁ +a ₂ s ₂ )

Wherein, s is the initial thickness of the brake pad; a ₁ and a ₂ are parameters obtained after multiple tests, and a ₁ +a ₂ =1. Since during the measurement process, the shading sheet 2 may rotate at a certain angle, but it has not reached the position of the counter, so it cannot be detected, and errors are prone to occur. A ₁ and a ₂ are parameters for multiple measurements to ensure accuracy.

In addition, the detection device 100 for the remaining thickness of the brake pad provided by the present invention can also detect whether the brake pad is successfully attached to the brake disc, including the following two methods:

①Due to the different production process of the brake pads or the different models of each component, the final thickness of different types of brake pads is also different, so the user needs to input the initial thickness of the brake pads detected or pass the selection Typical models already stored in the system database. When the first braking after assembly is completed, the distance measurement result will be automatically compared with the initial thickness input by the user in the system. Once it is greater than the initial thickness value, the system will immediately judge the distance between the brake pad and the brake disc. Whether the fit status is up to standard and alert the user based on the result.

②Because the train will not change the running line frequently after the official operation, and if the line condition does not change, the wear of the brake pads after one braking is also relatively fixed. At this time, the system will gradually fit If there is a significant difference between the remaining thickness value and the theoretical estimated value after one or several distance measurements, the system will alert the user and record the distance measurement data in detail; After several distance measurements, the remaining thickness value of the brake pad changes less than the specified range, the system will judge whether the bonding state of the brake pad and the brake disc is up to the standard and issue a warning to the user according to the result.

In this description, specific examples are used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only used to help understand the method and core idea of the present invention; meanwhile, for those of ordinary skill in the art, according to this The idea of the invention will have changes in the specific implementation and scope of application. In summary, the content of this specification should not be construed as limiting the present invention.

Claims (7)

1. The utility model provides a detection device of brake block residual thickness which characterized in that: the brake pad distance measuring device comprises a mounting shell, a driving element and a distance measuring rod, wherein the outer wall of one side of the mounting shell is used for being mounted on a back plate of a brake pad, an extending hole is formed in one side wall, close to a brake disc, of the mounting shell, the driving element is mounted in the mounting shell, an output shaft of the driving element is in transmission connection with one end of the distance measuring rod, and the driving element can drive the distance measuring rod to extend out of the mounting shell through the extending hole until the end of the distance measuring rod abuts against the brake disc;

the outer wall of the distance measuring rod is provided with threads, the inner wall of the extending hole is provided with threads, the distance measuring rod is in threaded connection with the extending hole, the driving element is connected in the mounting shell in a sliding mode and can drive the distance measuring rod to rotate, and the distance measuring rod drives the driving element to slide towards the direction close to or far away from the brake disc;

a sliding groove is fixed on the inner bottom surface of the mounting shell, a guide rail frame is connected in the sliding groove in a sliding mode, the driving element is mounted on the guide rail frame, and the driving element can slide along the sliding groove along with the guide rail frame;

still be fixed with photoelectric counter on the guide rail frame, fixed a light emitting component on the inner wall of installation shell, photoelectric counter can receive the light that light emitting component sent, photoelectric counter fixes the one end that is used for being close to the brake disc on the guide rail frame, be fixed with at least one anti-dazzling screen on the outer wall of range finding pole, light emitting component with photoelectric counter is located respectively the both sides of anti-dazzling screen, the range finding pole can drive anti-dazzling screen rotates, and makes anti-dazzling screen rotates to blockking photoelectric counter receives the light that light emitting component sent.

2. The apparatus for detecting the remaining thickness of a brake pad according to claim 1, wherein: the guide rail frame is further fixedly provided with a support, the support is fixed between the driving element and the photoelectric counter, the upper end of the support is provided with a mounting hole, a transmission assembly is rotatably mounted in the mounting hole, and one end of the distance measuring rod is in transmission connection with an output shaft of the driving element through the transmission assembly.

3. The apparatus for detecting the residual thickness of a brake pad according to claim 2, wherein: the transmission assembly comprises a left clamping piece, a right clamping piece and a bearing, wherein a left clamping piece fixing sleeve is arranged on an output shaft of the driving element, a right clamping piece fixing sleeve is arranged on the periphery of the distance measuring rod, the left clamping piece and the right clamping piece can be meshed, a bearing coaxial sleeve is arranged on the periphery of the right clamping piece, and the right clamping piece can rotate in the bearing.

4. The apparatus for detecting the remaining thickness of a brake pad according to claim 3, wherein: keep away from on the drive element the one end of range finding pole is fixed with elastic element, keep away from on the elastic element drive element's one end is fixed guide rail frame inner wall, drive element sliding connection in on the guide rail frame, be fixed with limit switch on the guide rail frame, drive element with photoelectric counter all with limit switch electricity is connected, under the initial condition, keep away from on the guide rail frame photoelectric counter's one end contact the inner wall of installation shell, just elastic element is in the compression state.

5. The apparatus for detecting the remaining thickness of a brake pad according to claim 4, wherein: a circle of left ratchets are fixed at one end, close to the right clamping piece, of the left clamping piece, and a circle of right ratchets are fixed at one end, close to the left clamping piece, of the right clamping piece; when the driving element is pushed by the elastic element to rotate towards the direction in which the left ratchet and the right ratchet tend to separate, the left clamping piece and the right clamping piece are always attached and synchronously rotate, and the distance measuring rod is driven to extend out of the extending hole; when the distance measuring rod contacts a brake disc, the right clamping piece cannot rotate, the left clamping piece continues to rotate and drives the driving element to move towards the direction of compressing the elastic element under the action of the slope tooth surface of the right ratchet, when the elastic element is compressed to the shortest distance, the driving element can touch the limit switch, the limit switch controls the driving element to stop, and meanwhile, the limit switch controls the photoelectric counter to output counting information; drive element orientation left side ratchet with when the direction of right side ratchet joint rotated, can drive left side joint spare with right side joint spare joint and synchronous rotation, and drive the range finding pole moves extremely to the direction of keeping away from the brake disc the guide rail puts up keeps away from photoelectric counter's one end contact the installation shell inner wall, just keep away from on the range finding pole drive element's one end contact stretch out the hole, simultaneously photoelectric counter outputs count information.

6. The apparatus for detecting the residual thickness of a brake pad according to claim 1, wherein: the installation shell is used for being fixed with the thermal-insulated gasket on the fixed outer wall of brake pad backplate, the thermal-insulated gasket is used for preventing the heat transfer on the brake pad backplate to on the installation shell.

7. The apparatus for detecting the remaining thickness of a brake pad according to claim 1, wherein: the drive element is an electric motor.

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