阅读说明：本技术 一种制动闸片剩余厚度的检测装置 (Detection apparatus for remaining thickness of brake lining ) 是由 周素霞 邵京 孙宇铎 肖楠 于 2021-09-07 设计创作，主要内容包括：本发明公开了一种制动闸片剩余厚度的检测装置,涉及检测装置技术领域,包括安装壳、驱动元件和测距杆,安装壳的一侧外壁用于安装在制动闸片的背板上,且安装壳上用于靠近制动盘的一侧壁上开设有伸出孔,驱动元件安装在安装壳内,且驱动元件的输出轴与测距杆的一端传动连接,驱动元件能够带动测距杆经伸出孔伸出安装壳至测距杆的端部抵住制动盘。该制动闸片剩余厚度的检测装置能够进行制动闸片剩余厚度的原位检测,检测效率高。(The invention discloses a device for detecting the residual thickness of a brake pad, which relates to the technical field of detection devices and comprises an installation shell, a driving element and a distance measuring rod, wherein the outer wall of one side of the installation shell is used for being installed on a back plate of the brake pad, an extending hole is formed in one side wall, close to a brake disc, of the installation shell, the driving element is installed in the installation 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 installation shell through the extending hole to the end part of the distance measuring rod to abut against the brake disc. The detection device for the residual thickness of the brake pad can be used for carrying out in-situ detection on the residual thickness of the brake pad, and is high in detection efficiency.)

1. The utility model provides a detection device of brake block residual thickness which characterized in that: including installation shell, driving element and range finding pole, one side outer wall of installation shell is used for installing on the backplate of brake lining, just be used for having seted up on the lateral wall that is close to the brake disc on the installation shell and having stretched out the hole, driving element installs in the installation shell, just driving element's output shaft with the one end transmission of range finding pole is connected, driving element can drive the range finding pole warp stretch out the hole installation shell extremely the tip of range finding pole supports the brake disc.

2. The apparatus for detecting the remaining thickness of a brake pad according to claim 1, wherein: be equipped with the screw thread on the outer wall of range finding pole, the inner wall of stretching out the hole is equipped with the screw thread, range finding pole with stretch out hole threaded connection, drive element sliding connection in the installation shell, just drive element can drive range finding pole rotates, and makes the range finding pole drives drive element slides to being close to or keeping away from the direction of brake disc.

3. The brake pad residual thickness detection device according to claim 2, wherein: the mounting shell is characterized in that 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 can follow the guide rail frame to slide along the sliding groove.

4. The apparatus for detecting the remaining thickness of a brake pad according to claim 3, wherein: 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.

5. The apparatus for detecting the remaining thickness of a brake pad according to claim 4, 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.

6. The apparatus for detecting the remaining thickness of a brake pad according to claim 5, 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.

7. The apparatus for detecting the remaining thickness of a brake pad according to claim 6, 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.

8. The apparatus for detecting the remaining thickness of a brake pad according to claim 7, 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 with 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, and when the elastic element is compressed to the shortest distance, the driving element can touch the limit switch and controls the driving element to stop through the limit switch, 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.

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

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

Technical Field

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

Background

The basic brake system of the train plays an indispensable role in the whole braking process, particularly, under the condition that the electric brake of the train fails, the basic brake can become a unique braking mode, and according to the relevant standards, if the residual thickness of the brake pad is limited to be used continuously, the basic brake may fail, and the safe operation of the train cannot be ensured, so that the residual thickness after the brake pad is braked is a very important index for evaluating whether the basic brake performance of the train can work normally.

The existing brake pad residual thickness detection can only be realized by detaching the brake pad during maintenance, then manually measuring and finally reinstalling. Although more accurate brake pad residual thickness result data can be obtained through the mode, huge manpower, material resources, time and other related resources are obviously needed, the pretightening force needs to be controlled again when the brake pad is installed again, whether the brake pad can be clamped successfully for braking needs to be verified, and then the service life of the used bolt can be reduced to a certain extent in the installation process, so that the service life of the whole brake pad is shortened. In addition, according to the relevant report and show, whether the accurate laminating brake disc of every brake pad of process that arrives basic brake when braking to the train still does not have effectual detection means at present, and then also can't in time restore, aggravated the wearing and tearing volume of all the other brake pads, more influenced the temperature rise condition of these brake pads and brake disc, finally cause brake pad and brake disc can't unify synchronous change, influenced whole car security. And when part of the brake pads are not attached to the brake disc, the brake air pressure of the air cylinder is greatly wasted.

Disclosure of Invention

The invention aims to provide a device for detecting the residual thickness of a brake pad, which is used for solving the problems in the prior art, can carry out in-situ detection on the residual thickness of the brake pad and has high detection efficiency.

In order to achieve the purpose, the invention provides the following scheme:

the invention provides a device for detecting the residual thickness of a brake pad, which comprises an installation shell, a driving element and a distance measuring rod, wherein the outer wall of one side of the installation shell is used for being installed on a back plate of the brake pad, an extending hole is formed in one side wall, close to a brake disc, of the installation shell, the driving element is installed in the installation 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 installation shell through the extending hole to the end part of the distance measuring rod to abut against the brake disc.

Preferably, be equipped with the screw thread on the outer wall of range finding pole, the inner wall that stretches out the hole is equipped with the screw thread, the range finding pole with stretch out hole threaded connection, drive element sliding connection in the installation shell, just drive element can drive the range finding pole rotates, and makes the range finding pole drives drive element slides to being close to or keeping away from the direction of brake disc.

Preferably, 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 follow the guide rail frame to slide along the sliding groove.

Preferably, 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 lens on the outer wall of range finding pole, light emitting component with photoelectric counter is located respectively the both sides of lens, the range finding pole can drive the lens rotates, and makes the lens rotate to blockking photoelectric counter receives the light that light emitting component sent.

Preferably, a support is further fixed on the guide rail frame, the support is fixed between the driving element and the photoelectric counter, a mounting hole is formed in the upper end of the support, 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.

Preferably, transmission assembly includes left joint spare, right joint spare and bearing, left side joint spare fixed cover is located on drive element's the output shaft, the fixed cover of right side joint spare is located the periphery of range finding pole, just left side joint spare with right side joint spare can mesh, the coaxial cover of bearing is located the periphery of right side joint spare, just right side joint spare can the bearing internal rotation.

Preferably, 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.

Preferably, a circle of left ratchets is fixed at one end of the left clamping piece, which is close to the right clamping piece, and a circle of right ratchets is fixed at one end of the right clamping piece, which is close to the left 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 with 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, and when the elastic element is compressed to the shortest distance, the driving element can touch the limit switch and controls the driving element to stop through the limit switch, 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.

Preferably, the mounting shell is fixed with a heat insulation gasket on an outer wall for fixing with the brake pad backing plate, and the heat insulation gasket is used for preventing heat on the brake pad backing plate from being transferred to the mounting shell.

Preferably, the drive element is an electric motor.

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

the invention provides a device for detecting the residual thickness of a brake pad, wherein an extension hole is arranged on one side wall of a mounting shell, which is close to a brake disc, a driving element is arranged in the mounting shell, and the output shaft of the driving element is in transmission connection with one end of the distance measuring rod, the driving element can drive the distance measuring rod to extend out of the mounting shell through the extension hole until the end part of the distance measuring rod abuts against the brake disc, and further the thickness of the back plate is subtracted by measuring the extension length of the distance measuring rod, the residual thickness of the brake pad is obtained, the measurement of the residual thickness of the brake pad is realized, the outer wall of one side of the mounting shell is used for being mounted on a back plate of the brake pad, thereby facilitating the in-situ measurement of the brake pad without detaching the brake pad, avoiding the bolt abrasion caused by repeatedly detaching the brake pad, and the incomplete fit between the brake pad and the brake disc accelerates the abrasion speed and influences the braking effect when the brake pad is installed again.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a device for detecting the residual thickness of a brake pad provided by the present invention;

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

FIG. 3 is a schematic structural diagram of a left clamping member and a right clamping member in the device for detecting the remaining thickness of the brake pad provided by the present invention;

FIG. 4 is a flow chart of the operation of the device for detecting the residual thickness of the brake pad provided by the present invention;

in the figure: 100-detection device for residual thickness of brake pad, 1-installation shell, 2-shading sheet, 3-distance measuring rod, 4-support, 5-bearing, 6-left clamping piece, 7-driving element, 8-guide rail frame, 9-heat insulation gasket, 10-photoelectric counter, 11-elastic element, 12-right clamping piece, 13-left ratchet and 14-right ratchet.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention aims to provide a device for detecting the residual thickness of a brake pad, which aims to solve the technical problems that the brake pad is required to be detached for detecting the residual thickness of the existing brake pad, the detection is inconvenient, and the service life is influenced by repeated detachment and installation.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

As shown in fig. 1-2, the present invention provides a device 100 for detecting the remaining thickness of a brake pad, which is used for in-situ measurement of the brake pad, and includes a mounting housing 1, a driving element 7 and a distance measuring rod 3, wherein an extending hole is formed on a side wall of the mounting housing 1, which is used for being close to a brake disc, the driving element 7 is mounted in the mounting housing 1, an output shaft of the driving element 7 is in transmission connection with one end of the distance measuring rod 3, the driving element 7 can drive the distance measuring rod 3 to extend out of the mounting housing 1 through the extending hole, to an end portion of the distance measuring rod 3 to abut against the brake disc, and then the remaining thickness of the brake pad can be obtained by measuring the extending length of the distance measuring rod 3 and subtracting the thickness of a backing plate, so as to realize measurement of the remaining thickness of the brake pad, the outer wall of one side of the mounting housing 1 is used for being mounted on the backing plate of the brake pad, thereby facilitating in-situ measurement of the brake pad without detaching the brake pad, bolt abrasion caused by repeated disassembly and assembly of the brake pad is avoided, and the incomplete attachment of the brake pad and the brake disc accelerates abrasion speed and influences braking effect when the brake pad is installed again.

Specifically, be equipped with the screw thread on the outer wall of range finding pole 3, the inner wall of stretching out the hole is equipped with the screw thread, range finding pole 3 with stretch out hole threaded connection, and then when inner wall through stretching out the hole supports range finding pole 3, still realize range finding pole 3's rotation and axial displacement through threaded connection, driving element 7 sliding connection is in installation shell 1, when driving element 7 drive range finding pole 3 rotates, because range finding pole 3 with stretch out hole threaded connection, make range finding pole 3 to the direction removal of stretching out installation shell 1, and then drive driving element 7 and slide to the direction of being close to or keeping away from the brake disc, so that to the measurement of brake block surplus thickness.

The inner bottom surface of the mounting shell 1 is fixedly provided with a sliding groove, a guide rail frame 8 is connected in the sliding groove in a sliding mode, the driving element 7 is mounted on the guide rail frame 8, the driving element 7 can slide along the sliding groove along with the guide rail frame 8, the axial positioning function of each moving part is achieved, the working resistance of the driving element 7 and the distance measuring rod 3 is reduced, and energy consumption is reduced.

A photoelectric counter 10 is further 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 light emitted by the light emitting element, the photoelectric counter 10 is fixed on one end of the guide rail frame 8, which is close to a brake disc, so as to prevent the driving element 7 from influencing the light receiving 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 the light shielding sheets 2 is two, the light emitting element and the photoelectric counter 10 are respectively positioned at two sides of the light shielding sheet 2, the distance measuring rod 3 can drive the light shielding sheets 2 to rotate, and the light shielding sheets 2 are enabled to rotate to block the photoelectric counter 10 from receiving the light emitted by the light emitting element, so that the light shielding sheets 2 shield primary light, the photoelectric counter 10 counts one number, the number is matched with the number of the light shielding sheets 2 at the periphery of the distance measuring rod 3 through the final reading of the photoelectric counter 10, and calculating the extension length of the distance measuring rod 3 by the thread lead at the periphery of the distance measuring rod 3, and further obtaining the residual thickness of the brake pad.

Still be fixed with support 4 on the guide rail frame 8, support 4 is fixed in between drive element 7 and the photoelectric counter 10, the mounting hole has been seted up to the upper end of support 4, a drive assembly is installed in the mounting hole rotation, the one end of range finding pole 3 is connected through the drive assembly transmission with the output shaft of drive element 7, install and support drive assembly through support 4, and then realize being connected of drive element 7 output shaft and range finding pole 3, so that drive element 7 is to the stable drive of range finding pole 3.

As shown in fig. 3, the transmission assembly includes left joint spare 6, right joint spare 12 and bearing 5, preferably, left joint spare 6 and right joint spare 12 are the ratchet, and the ratchet on two ratchets can mesh, left joint spare 6 fixed cover is located on the output shaft of drive element 7, and left joint spare 6 can follow the synchronous rotation of the output shaft of drive element 7, the periphery of range finding pole 3 is located to right joint spare 12 fixed cover, and right joint spare 12 can rotate with range finding pole 3 synchronous, left joint spare 6 and right joint spare 12 can mesh, the periphery of right joint spare 12 is located to bearing 5 coaxial cover, and right joint spare 12 can rotate in bearing 5, and then under the prerequisite of guaranteeing the support to the transmission assembly, still can not influence the rotation of transmission assembly.

An elastic element 11 is fixed on one end of the driving element 7 far away from the distance measuring rod 3, one end of the elastic element 11 far away from the driving element 7 is fixed on the inner wall of the guide rail frame 8, the driving element 7 is connected on the guide rail frame 8 in a sliding way, a limit switch is fixed on the guide rail frame 8, the driving element 7 and the photoelectric counter 10 are both electrically connected with the limit switch, and further, the drive element 7 can be controlled to be opened or closed by the limit switch, and the photoelectric counter 10 can be controlled to be opened or closed and data output by the limit switch, and in an initial state, one end of the guide rail bracket 8 far away from the photoelectric counter 10 is contacted with the inner wall of the mounting shell 1, and the elastic element 11 is in a compressed state, so that the left clamping piece 6 is extruded by the elastic restoring force of the elastic element 11 to ensure that the left clamping piece 6 is jointed with the right clamping piece 12, meanwhile, one end of the distance measuring rod 3, which is far away from the driving element 7, contacts with the extending hole, so that resetting of all elements is facilitated.

A circle of left ratchets 13 are fixed at one end of the left clamping piece 6 close to the right clamping piece 12, and a circle of right ratchets 14 are fixed at one end of the right clamping piece 12 close to the left clamping piece 6; when the driving element 7 is pushed by the elastic element 11 to rotate towards the direction in which the left ratchet 13 and the right ratchet 14 have a separation tendency, the left clamping piece 6 and the right clamping piece 12 are always attached and synchronously rotate under the action of extrusion force and friction force, so that the driving element 7 drives the left clamping piece 6 to rotate, the left clamping piece 6 rotates and the right clamping piece 12 rotates, the right clamping piece 12 drives the distance measuring rod 3 to rotate, the distance measuring rod 3 extends out of the extending hole, and meanwhile, the driving element 7 is also driven to move towards the direction close to the extending hole; when the distance measuring rod 3 contacts a brake disc, the distance measuring rod 3 and the right clamping piece 12 cannot rotate under the limitation of the brake disc, the left clamping piece 6 continues to rotate and drives the driving element 7 to move towards the direction of compressing the elastic element 11 under the action of the slope tooth surface of the right ratchet 14, namely in the process, the tooth top of the left clamping piece 6 moves to the tooth top of the right clamping piece 12 from the tooth root of the right clamping piece 12, the left clamping piece 6 and the right clamping piece 12 are not separated all the time, when the elastic element 11 is compressed to the shortest distance, the driving element 7 moves to touch the limit switch, the driving element 7 is controlled to stop through the limit switch, meanwhile, the limit switch controls the photoelectric counter 10 to output counting information, the screwing-out length of the distance measuring rod 3 is obtained through calculation, the residual thickness of the brake pad is finally obtained, and the first measurement is realized; when drive element 7 rotates towards the direction of left ratchet 13 and the 14 joint of right ratchet, drive element 7 rotates towards the direction opposite with the initial rotation direction promptly, can drive left joint spare 6 and the joint of right joint spare 12 (the ratchet meshing of left joint spare 6 and right joint spare 12 promptly) and synchronous the rotation, and then drive range finding pole 3 to the direction of keeping away from the brake disc remove to the one end contact installation shell 1 inner wall of keeping away from photoelectric counter 10 on the guide rail frame 8, and the one end contact that keeps away from drive element 7 on the range finding pole 3 stretches out the hole, realize resetting of range finding pole 3, photoelectric counter 10 outputs count information simultaneously, and then length when calculating through data such as count value and obtaining range finding pole 3 return stroke, calculate the remaining thickness of more accurate brake block through the weighted average method with twice length, realize the second measurement. Preferably, as shown in fig. 4, the calculating method may 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 measured value, so as to improve the accuracy of the measurement result, and monitor the remaining thickness in real time. In the process, the elastic element 11 can provide a buffer protection function and can realize the resetting of the driving element 7 so as to facilitate the next measurement. Preferably, the elastic element 11 is a spring.

Installation shell 1 is being used for being fixed with thermal-insulated gasket 9 on the outer wall fixed with the brake lining backplate, and thermal-insulated gasket 9 is used for preventing heat transfer to installation shell 1 on the brake lining backplate, and then prevents that the heat transfer that the braking in-process produced from to photoelectric counter 10, influences the count accuracy, and then influences the measurement to the remaining thickness of brake lining.

The drive element 7 is an electric motor.

After the first measurement is completed, the final reading n of the photoelectric counter 10 is used₁The number w of the light shielding sheets 2 at the periphery of the distance measuring rod 3 and the thread lead l at the periphery of the distance measuring rod 3 are calculated to obtain the advancing distance s of the distance measuring rod 3₁：

After the second measurement is completed, the final reading n of the photoelectric counter 10 is used₂The number w of the light shielding sheets 2 at the periphery of the distance measuring rod 3 and the thread lead l at the periphery of the distance measuring rod 3 are calculated to obtain the return distance s of the distance measuring rod 3₂：

Calculating the residual thickness d of the brake pad by using a weighted average method:

d＝a₁s₁+a₂s₂

wear d of brake pad_i：

d_i＝s-(a₁s₁+a₂s₂)

Wherein s is the initial thickness of the brake pad; a is₁、a₂Is a parameter obtained after a plurality of experiments, and a₁+a₂1. Because the light shading sheet 2 may rotate during the measurement processA certain angle is formed, but the angle does not reach the position of the counter, so the angle cannot be detected, and the error is easy to occur, a₁And a₂The multiple measurements are parameters that ensure accuracy.

In addition, the device 100 for detecting the residual thickness of the brake pad provided by the invention can detect whether the brake pad is successfully attached to the brake disc, and comprises the following two methods:

firstly, because the final thicknesses of brake pads of different models are different due to different production processes of the brake pads or different models of various parts, a user needs to input the initial thickness of the brake pad detected by the user or select a typical model stored in a system database when the brake pad is used. When the first braking after assembly is finished, the obtained distance measurement result can be automatically compared with the initial thickness input by a user in the system, once the distance measurement result is greater than the initial thickness value, the system can immediately judge whether the attaching state of the brake pad and the brake disc reaches the standard or not and send out a warning to the user according to the result.

Secondly, after the train is formally operated, the running line cannot be frequently changed, and under the condition that the line condition is not changed, the abrasion loss of the brake pad is relatively fixed after the brake is performed for one time, at the moment, the system can gradually fit a wear curve and a residual thickness curve, if the residual thickness value is obviously different from a theoretical estimated value after the distance measurement is performed for one time or several times, the system can give an alarm to a user and record the distance measurement data in detail; after several distance measurements, the change range of the residual thickness value of the brake pad is smaller than the specified range, and the system can judge whether the attaching state of the brake pad and the brake disc reaches the standard or not and send out a warning to a user according to the result.

The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In summary, this summary should not be construed to limit the present invention.