A detection device and method for online detecting the length of brake pad steel back

Abstract

This invention relates to a testing device and method for online detection of the steel backing length of brake pads. The testing device includes a controller, a testing platform, and a display module. The testing platform is equipped with a first limiting block, a second limiting block, and a clamping mechanism. The clamping mechanism is positioned opposite to the first limiting block along the length direction of the steel backing. The clamping mechanism includes a servo motor and a clamping block. The output end of the servo motor is connected to the clamping block and drives the clamping block to reciprocate toward the first limiting block. The second limiting block is located on one side of the testing platform and is used to abut against the side of the steel backing. The display module and the clamping mechanism are electrically connected to the controller. This invention achieves online automatic full inspection by using a servo motor to drive the clamping block to measure the steel backing length through contact. It features high testing efficiency and accuracy, is unaffected by environmental conditions, has low equipment cost, and is easy to operate. The test results are automatically recorded and bound to the product identification code, enabling product quality traceability.

Description

Technical Field

[0001] This invention relates to the field of brake pad steel backing inspection technology, specifically to an inspection device and method for online inspection of brake pad steel backing length. Background Technology

[0002] Brake pads are a core component of a vehicle's braking system, and their quality directly affects the overall braking performance. Brake pads mainly consist of a steel backing, friction material, and adhesive, with the steel backing serving to fix and support the friction material. During braking, the caliper pushes the steel backing to bring the friction material into contact with the brake disc or brake drum, using friction to achieve deceleration or stopping. After the steel backing is manufactured, its length, thickness, and other dimensional parameters must be rigorously tested to ensure product quality and driving safety.

[0003] Currently, there are four main methods for detecting the length of steel backing, but all of them have significant shortcomings: 1. Manual inspection: This method relies on operators using measuring tools, which is labor-intensive, inefficient, and prone to fatigue. Inspection accuracy is difficult to guarantee, and misjudgments are common. This method typically only allows for random sampling, not full inspection, and inspection results are mostly recorded on paper forms, making it difficult to achieve automatic data archiving, traceability, and information sharing.

[0004] 2. Coordinate Measuring Machine (CMM): CMMs are high-precision laboratory equipment, expensive and located far from the production line, resulting in poor inspection timeliness. The length of the steel backing is measured by averaging the distances between multiple points. This method is time-consuming and inefficient, and can only perform random sampling, failing to cover all products and thus unable to meet the needs of online full inspection and traceability.

[0005] 3. Laser scanning imaging inspection: This method requires a high-quality laser scanner, which is bulky and expensive. The massive amount of point cloud data collected requires post-processing and cannot output results in real time. The inspection effect is easily affected by factors such as ambient light and workpiece surface reflection, and it requires a high level of professional skills from operators, resulting in high training and maintenance costs.

[0006] 4. Image Inspection: The inspection lens and light source are prone to dust accumulation, requiring regular cleaning and calibration. Production line vibrations can also cause camera shift, necessitating frequent calibration. The inspection camera lens has a limited depth of field, easily becoming out of focus when workpieces have significant height differences or are placed at an angle. Inspection results are significantly affected by environmental factors such as lighting, reflections, dust, and vibration. Special lighting schemes are required for mirrored, highly reflective, and dark-colored light-absorbing workpieces, making debugging complex. Furthermore, there are imaging blind spots for complex structures such as uneven surfaces, deep holes, obstructions, and multiple steps; the inspection results for transparent and semi-transparent workpieces are also poor.

[0007] Additionally, the brake pads have a groove on which an alarm is installed. The alarm detects the wear of the friction material on the brake pads. When the wear reaches a set value, the alarm sounds to ensure driving safety. To ensure proper installation of the alarm, the thickness of the groove needs to be measured. Currently, this is done manually with calipers, which is inefficient.

[0008] In summary, existing testing methods are insufficient in terms of efficiency, accuracy, full inspection capability, environmental adaptability, data management, and automation level to meet the actual needs of steel backing production lines for online, rapid, accurate, and traceable testing. Summary of the Invention

[0009] This invention addresses the existing technical problems by providing a testing device and method for online detection of the steel back length of brake pads.

[0010] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A testing device for online detection of the length of the steel backing of brake pads includes a controller, a testing platform and a display module. The testing platform is provided with a first limiting block, a second limiting block and a clamping mechanism. The clamping mechanism and the first limiting block are arranged opposite to each other along the length direction of the steel backing. The clamping mechanism includes a servo motor and a clamping block. The output end of the servo motor is connected to the clamping block and drives the clamping block to reciprocate toward the first limiting block to press the steel backing against the first limiting block. The second limiting block is located on one side of the testing platform and is used to abut against the side of the steel backing. The display module and the clamping mechanism are electrically connected to the controller.

[0011] Based on the above technical solution, the present invention can be further improved as follows: Preferably, the display module includes a display screen, a barcode scanner, and an alarm.

[0012] Preferably, it also includes a support frame, which is set on the testing table. The first limiting block, the second limiting block and the clamping mechanism are installed on the support frame. The support frame is provided with a guide groove, which extends along the length direction of the steel backing. The clamping block is movably set in the guide groove.

[0013] Preferably, it also includes a slot detection mechanism, which is disposed on one side of the steel back slot. The slot detection mechanism includes a feed drive, a measuring head, and a stroke tolerance detection component. The output end of the feed drive is connected to the measuring head and is used to drive the measuring head to reciprocate in a direction close to or away from the steel back slot. The stroke tolerance detection component is used to detect the stroke state of the measuring head and send the detection signal to the controller to determine whether the thickness of the steel back slot is out of tolerance.

[0014] Preferably, the feed drive is a cylinder or a motor, and the measuring head is provided with a stepped measuring groove. The measuring groove includes an upper limit measuring groove and a lower limit measuring groove arranged sequentially along the detection direction. The groove width of the upper limit measuring groove is adapted to the upper limit dimension of the thickness of the steel backing groove, and the groove width of the lower limit measuring groove is adapted to the lower limit dimension of the thickness of the steel backing groove. The groove width of the upper limit measuring groove is greater than the groove width of the lower limit measuring groove.

[0015] Preferably, the travel deviation detection component includes a first inductive switch and a second inductive switch, which are arranged at intervals along the moving direction of the measuring head, and the measuring head is provided with corresponding sensing elements.

[0016] Preferably, the card slot detection mechanism further includes a retaining clip, on which the measuring head is detachably mounted.

[0017] Preferably, the testing platform is tilted, with a tilt angle of 30°-60°.

[0018] The beneficial effects of the testing equipment of this invention are as follows: By using a servo motor to drive the clamping block to contact and measure the length of the steel backing, the measurement operation can be completed directly on the production line without transferring the steel backing to a dedicated testing station. This truly achieves online automatic full inspection, which significantly improves testing efficiency and ensures testing accuracy. At the same time, it is not affected by the production environment such as workshop lighting, dust, and vibration. The entire testing equipment has low cost and low operating threshold. The test results can be automatically recorded and directly bound to the product identification code, which can completely retain the test data of each product, facilitating subsequent product quality traceability. It effectively solves the problem that existing testing technologies cannot simultaneously achieve testing efficiency, accuracy, full inspection requirements, and traceability.

[0019] This invention also discloses a method for online automatic detection and recording of the length dimension of brake pad steel backing, using the aforementioned equipment, and comprising the following steps: Measurement and calibration: Place a gauge block of standard length on the testing table, with one end of the gauge block abutting against the first limit block. The clamping block of the clamping mechanism moves toward the gauge block. When the resistance of the clamping block reaches the preset torque value, the movement stops. Read the displacement of the clamping block and add the displacement to the length value of the gauge block to obtain the reference total length, thus completing the reference calibration. Steel backing positioning and identification: The steel backing to be tested is placed on the testing platform, the barcode scanner reads the identification code on the steel backing for identification, and the controller automatically creates the corresponding test record file based on the identification result; Steel back length measurement: Place the steel back to be measured on the testing table, so that one end of the steel back abuts against the first limit block. The clamping block of the clamping mechanism moves toward the other end of the steel back. When the resistance of the clamping block reaches the preset torque value, the movement stops. Read the displacement of the clamping block. The controller calculates the steel back length dimension based on the difference between the reference total length and the displacement. Results display and recording steps: The controller sends the obtained steel back length dimension to the display module for display, and at the same time the data recording module automatically saves the length dimension data into the detection record file. If the steel back length dimension exceeds the preset tolerance range, an alarm signal is issued. Sorting: After measurement, the steel backings are sorted into qualified and unqualified products according to the test results.

[0020] Preferably, after measuring the length of the steel back, the method further includes steel back slot detection: the feed drive drives the measuring head to feed into the steel back slot so that the stepped measuring slot matches the steel back slot; when the steel back slot cannot be inserted into the upper limit measuring slot of the measuring head, it is determined that the thickness of the steel back slot is greater than the upper limit size; when the steel back slot passes through the upper limit measuring slot of the measuring head and is inserted into the lower limit measuring slot of the measuring head, it is determined that the thickness of the steel back slot is less than the lower limit size. The travel deviation detection component is used to detect the actual travel displacement of the measuring head during the detection process and transmit the detection signal to the controller. The controller determines the thickness detection result of the steel back groove based on the comparison result between the actual travel displacement and the preset travel range, and sends the detection result to the display module for display.

[0021] The beneficial effects of the detection method of this invention are as follows: This invention relies on the torque judgment of the servo motor combined with displacement detection to accurately obtain the actual length of the steel backing. After calibration, batch full inspection can be completed directly on the production line without manual measurement and recording. The detection speed is fast, the results are consistent, and the subjective error of manual measurement is eliminated, ensuring reliable detection stability and accuracy. The entire detection process does not require complex data post-processing, and the results can be output in real time after the detection is completed, adapting to the continuous operation rhythm of the production line. By scanning and binding the detection data, traceability management of the detection data of each product is realized, which can provide complete data support for production process optimization and traceability of non-conforming products. At the same time, the groove depth detection process is added, which can simultaneously complete the detection of key structural dimensions of the steel backing, further improving the detection efficiency of the production line and better meeting the actual needs of automated production of brake pad steel backing. Attached Figure Description

[0022] Figure 1 This is a three-dimensional schematic diagram of the detection device of the present invention; Figure 2 This is a three-dimensional schematic diagram of the detection device of the present invention when detecting a steel backing. Figure 1 ; Figure 3 For the present invention Figure 2 A magnified view of a portion of point A in the middle; Figure 4 This is a three-dimensional schematic diagram of the detection device of the present invention. Figure 2 ; Figure 5 This is a three-dimensional schematic diagram of the detection device of the present invention. Figure 3 ; Figure 6 This is a three-dimensional schematic diagram of the measuring head of the present invention; Figure 7 This is a front view of the measuring head of the present invention; Figure 8 This is a schematic diagram of a steel backing in the prior art.

[0023] The attached diagram is labeled as follows: 1. Display screen; 2. Testing table; 3. Steel back; 31. Steel back slot; 4. First limit block; 5. Second limit block; 6. Servo motor; 7. Guide groove; 8. Clamping block; 9. Measuring head; 91. Upper limit measuring groove; 92. Lower limit measuring groove; 10. Cylinder; 11. First inductive switch; 12. Second inductive switch; 13. Support frame; 14. Fixing clamp; 15. Long slot. Detailed Implementation

[0024] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0025] like Figures 1 to 8 As shown, this invention discloses a testing device for online detection of the length of the steel backing of brake pads, including a controller, a testing platform 2, and a display module. The controller, a PLC or microcontroller, is installed inside the device body and is used to receive signals from various sensors and issue control commands. The display module includes a bracket, a barcode scanner, an alarm, and a display screen 1. The display screen 1 is mounted on the bracket and is used to display the test results. The bracket is mounted on one side of the testing platform 2. The barcode scanner is used to read the QR code or identification code on the steel backing 3. The alarm is used to issue an audible and visual alarm signal when the test fails. The testing platform 2 is mounted on the device body and is used to support the steel backing 3 to be tested. The testing table 2 is equipped with a first limiting block 4, a second limiting block 5, and a clamping mechanism. The clamping mechanism and the first limiting block 4 are arranged opposite each other along the length direction of the steel back 3. The clamping mechanism includes a servo motor 6 and a clamping block 8. The output end of the servo motor 6 is connected to the clamping block 8 and drives the clamping block 8 to reciprocate toward the first limiting block 4 to press the steel back 3 against the first limiting block 4. The second limiting block 5 is located on one side of the testing table 2 and is used to abut against the side of the steel back 3 to limit the steel back 3 in the horizontal direction. The display module and the clamping mechanism are electrically connected to the controller.

[0026] The first limiting block 4 is used to limit the end position of the steel back 3 in the length direction, serving as the reference end for measurement; the second limiting block 5 is used to limit the side position of the steel back 3 in the width direction, preventing the steel back 3 from shifting laterally during the detection process and ensuring the stability of the detection. The controller calculates the length dimension of the steel back 3 based on the movement of the clamping mechanism and displays the result on the display screen 1.

[0027] The tilt angle between the testing platform 2 and the horizontal plane is 30°-60°. In this embodiment, the tilt angle of the testing platform 2 is 45°, which facilitates the steel back 3 to be tested to automatically slide to the limiting position of the second limiting block 5 under the action of gravity. The tilt setting helps the steel back 3 to stick tightly to the limiting surface of the second limiting block 5 during the testing process, thus improving the positioning stability.

[0028] As an alternative, the testing platform 2 can also be set horizontally to push the steel backing 3 to be tested to the limit position.

[0029] The clamping mechanism includes a servo motor 6 and a clamping block 8, with the output of the servo motor 6 connected to the clamping block 8. The servo motor 6 has a built-in encoder that accurately reads the number of motor rotations, which is then converted into the linear displacement of the clamping block 8. The servo motor 6 is connected to a linear module, and the clamping block 8 is fixedly mounted on the linear module. The linear module utilizes existing technology and mainly includes a guide rail, a lead screw, and a nut assembly mounted on the lead screw. The servo motor 6 is connected to the lead screw of the module via a coupling, driving the lead screw to rotate. The nut assembly on the lead screw moves linearly along the guide rail and is fixedly connected to the clamping block 8, thus causing the clamping block 8 to move synchronously. By pre-setting the torque value of the servo motor 6, when the clamping block 8 encounters resistance during movement and the resistance reaches the preset torque value, the servo motor 6 stops rotating. At this time, the controller reads the number of encoder rotations of the servo motor 6 as the displacement. This clamping mechanism has a simple structure, rapid response, and can achieve precise displacement control. Furthermore, the torque limiting method achieves flexible contact, avoiding damage to the workpiece surface due to excessive clamping force. After the servo motor 6 stops, it maintains its current state to ensure that the position of the clamping block 8 is stable during the measurement process and to prevent changes in displacement caused by external force disturbance.

[0030] The testing equipment also includes a support frame 13, which is mounted on the testing table 2. The first limiting block 4, the second limiting block 5, and the clamping mechanism are all mounted on the support frame 13. One end of the support frame 13 has a guide groove 7 extending along the length of the steel backing 3. The clamping block 8 is movably disposed within the guide groove 7. The guide groove 7 guides and limits the movement of the clamping block 8, ensuring that the clamping block 8 moves in a straight line, ensuring consistency in the measurement direction, preventing measurement errors caused by the clamping block 8's offset, and improving testing accuracy.

[0031] Furthermore, the second limiting block 5 is provided with multiple elongated grooves 15 spaced apart along the length direction. The elongated grooves 15 extend along the width direction of the second limiting block 5. By adjusting the installation position of the second limiting block 5 on the support frame 13, it can adapt to the positioning requirements of steel backings 3 of different widths without the need to replace the limiting components, thereby improving the versatility of the equipment and reducing the modification cost.

[0032] The testing equipment also includes a slot detection mechanism, which is located on one side of the steel-backed slot 31. In this embodiment, the slot detection mechanism is positioned opposite to the second limiting block 5. The slot detection mechanism includes a feed drive, a measuring head 9, and a stroke tolerance detection component. The output end of the feed drive is connected to the measuring head 9, which drives the measuring head 9 to reciprocate in a direction approaching or away from the steel-backed slot 31. The stroke tolerance detection component detects the stroke state of the measuring head 9 and sends a detection signal to the controller to determine whether the thickness of the steel-backed slot 31 exceeds the tolerance. The feed drive is a cylinder 10 or a motor. The measuring head 9 is provided with stepped measuring grooves, including an upper limit measuring groove 91 and a lower limit measuring groove 92 arranged sequentially along the detection direction. The width of the upper limit measuring groove 91 is adapted to the upper limit dimension of the thickness of the steel back groove 31, and the width of the lower limit measuring groove 92 is adapted to the lower limit dimension of the thickness of the steel back groove 31. The width of the upper limit measuring groove 91 is greater than the width of the lower limit measuring groove 92. During measurement, the cylinder 10 drives the measuring head 9 to move towards the steel back groove 31. By detecting the displacement of the measuring head 9, the thickness of the steel back groove 31 is determined to be qualified. This groove detection mechanism can simultaneously complete the automatic detection of the dimensions of the steel back groove 31 without additional procedures, thus improving detection efficiency.

[0033] Specifically, the travel tolerance detection component includes a first inductive switch 11 and a second inductive switch 12. The first and second inductive switches 11 and 12 are arranged at intervals along the moving direction of the measuring head 9. The measuring head 9 is equipped with corresponding sensors that move synchronously with it. The distance between the first inductive switch 11 and the second inductive switch 12 constitutes the allowable tolerance range of the steel back groove 31. When the sensor moves with the measuring head 9 and is located between the first and second inductive switches 11 and 12, the thickness of the steel back groove 31 is deemed acceptable. When the sensor exceeds the range of either the first or second inductive switch 11, the thickness of the steel back groove 31 is deemed to be out of tolerance, and the controller activates an alarm signal. This travel tolerance detection component has a simple structure, low cost, and rapid response. It can determine the groove depth in real time online, achieving full online inspection of the groove depth.

[0034] The slot inspection mechanism also includes a fixing clamp 14, on which the measuring head 9 is detachably mounted. Different specifications of steel backing slots 31 may have different dimensions; the detachable mounting method allows for quick replacement of the appropriate measuring head 9, improving the equipment's versatility and adaptability, and meeting the production and inspection needs of various steel backing products.

[0035] This invention also provides a method for online automatic detection and recording of the length dimension of brake pad steel backing, using the above-mentioned equipment, and including the following steps: Measurement Calibration: A gauge block of standard length is placed on the testing table 2, with one end of the gauge block abutting against the first limiting block 4 and the second limiting block 5 supporting the gauge block, thus positioning the gauge block. The clamping block 8 returns to its original position under the drive of the servo motor 6, and then the measurement is initiated: the clamping block 8 moves towards the gauge block under the drive of the servo motor 6. When the resistance experienced by the clamping block 8 reaches a preset torque value, the movement stops. The displacement of the clamping block 8 is read, and this displacement is added to the length of the gauge block to obtain the total reference length, completing the reference calibration. The total reference length is displayed on the display screen 1.

[0036] If it is necessary to verify whether the measured values ​​of the equipment are accurate, select a gauge block of another length for verification. If the length value obtained by subtracting the displacement of clamping block 8 from the total reference length is within the length error range of the gauge block, it indicates that the equipment is calibrated accurately, the equipment is deemed to be in good condition, and subsequent measurements can be performed. If the verification result is unqualified, the total length of the reference is corrected by manually inputting the error compensation value to eliminate system calibration error and ensure the accuracy of subsequent measurement results. Through the above calibration and verification steps, it is ensured that the equipment is in normal working order after each power-on or model change, avoiding batch false detections due to equipment failure.

[0037] Steel Backing Positioning and Identification: The steel backing 3 to be tested is placed on the testing table 2 by a robotic arm or manually. The barcode scanner reads the QR code or identification code on the steel backing 3 for identification. After identification, the controller automatically creates a test record file for the product. Through barcode scanning and automatic filing, the identity binding of the test data of each steel backing 3 product is realized, providing a data foundation for product quality traceability.

[0038] Steel Back Length Measurement: After the record file is created, the controller issues a command to measure the steel back 3. The servo motor 6 rotates, driving the linear module to move, which in turn moves the clamping block 8 forward. When the clamping block 8 encounters resistance from the steel back 3 during its forward movement, and the resistance exceeds a set value (i.e., reaches a preset torque value), the servo motor 6 stops rotating. The controller reads the current encoder rotation of the servo motor 6 as the displacement during measurement. The controller calculates the length of the steel back 3 based on the difference between the reference total length and the displacement.

[0039] Specifically, the length of the steel backing is calculated using the following formula: Steel backing length = Total reference length - Measured displacement = Calibration value + (Calibration displacement) (Measurement of displacement). The calibration value is the standard length of the gauge block (e.g., 250mm). The calibration displacement is the displacement recorded by the encoder when the servo motor 6 drives the clamping block 8 to contact the gauge block during the calibration step. The measured displacement is the displacement recorded by the encoder when the servo motor 6 drives the clamping block 8 to contact the steel back 3 during the steel back length measurement step. When the difference between the calibration displacement and the measured displacement is positive, it indicates that the steel back length is greater than the calibration value; when the difference is negative, it indicates that the steel back length is less than the calibration value; when the difference is zero, it indicates that the steel back length is equal to the calibration value. For example, if the calibration displacement is 100.00mm and the measured displacement is 100.05mm, then the steel back length = 250mm + (100.00mm) / 250mm. (100.05mm) = 249.95mm. This calculation method is simple and reliable, and can obtain accurate steel back length dimensions without additional sensors. During this process, the resistance of clamping block 8 is detected by the change in current of servo motor 6. When the current reaches a preset threshold, it is determined that the resistance has reached a preset torque value. After servo motor 6 stops, it maintains the current state until the controller issues a reset command, ensuring that the position of clamping block 8 is stable during the measurement process and preventing displacement reading deviations caused by external force disturbances.

[0040] The detection steps for the steel back slot 31 are as follows: The controller controls the feed drive (cylinder 10) to drive the measuring head 9 to feed towards the steel back slot 31 so that the stepped measuring groove matches the steel back slot 31. When the steel back slot 31 cannot be inserted into the upper limit measuring groove 91, it is determined that the thickness of the steel back slot 31 is greater than the upper limit size. When the steel back slot 31 passes through the upper limit measuring groove 91 and is inserted into the lower limit measuring groove 92, it is determined that the thickness of the steel back slot 31 is less than the lower limit size.

[0041] The travel deviation detection component is used to detect the actual travel displacement of the measuring head 9 during the detection process and transmit the detection signal to the controller. The controller determines the thickness detection result of the steel back groove 31 based on the comparison result between the actual travel displacement and the preset travel range, and sends the detection result to the display module for display.

[0042] Specifically, when the steel back slot 31 cannot be inserted into the upper limit measuring slot 91, the measuring head 9 is blocked, and the sensing element stops in front of the first sensing switch 11. Then it is determined that the thickness of the steel back slot 31 is greater than the upper limit size. Neither the first sensing switch 11 nor the second sensing switch 12 is triggered, and the thickness of the steel back slot 31 is determined to be unqualified. When the steel back slot 31 passes through the upper limit measuring slot 91 and is inserted into the lower limit measuring slot 92, the measuring head 9 continues to feed, the sensing element moves to the position of the second sensing switch 12 and triggers the second sensing switch 12, then it is determined that the thickness of the steel back slot 31 is less than the lower limit dimension, and the thickness of the steel back slot 31 is determined to be unqualified. When the sensor only triggers the first sensor switch 11 and does not trigger the second sensor switch 12, the thickness of the steel back slot 31 is determined to be qualified.

[0043] If the result is unqualified, the controller will activate the alarm to issue an alarm signal. The above steps enable online automatic detection of the thickness of the steel backing groove 3, which is completed simultaneously with the length detection, thus improving detection efficiency.

[0044] Results Display and Recording Steps: The controller sends the obtained steel back length dimension and steel back slot 31 detection results to the display module, which displays the detection results on screen 1. While displaying the measurement results, the system automatically saves the steel back length dimension data and steel back slot 31 detection results into a previously established detection record file, achieving automatic data archiving. All detection results are bound to the product QR code or unique product identification, enabling data traceability.

[0045] Alarm procedure: If the detected length or steel back slot 31 exceeds the preset tolerance range, it is determined to be a defective product, and the equipment will issue an audible and visual alarm through the alarm device.

[0046] Sorting steps: After measurement, the steel back 3 is sorted into qualified and unqualified products by a robotic arm or by manual labor based on the test results.

[0047] In summary, the testing equipment and method of this invention can simultaneously perform online testing of the length and thickness of the brake pad steel backing groove 31, eliminating the need for multiple batch loading and unloading. Compared to traditional manual and step-by-step testing methods, this significantly reduces testing time and labor costs, while avoiding error fluctuations caused by manual testing and improving the accuracy and consistency of test results. Relying on the binding and traceability function of testing data with the product's unique identifier, it enables rapid location and backtracking of non-conforming products, facilitating timely adjustment of process parameters in the production process, effectively improving the overall quality control level of brake pad steel backing production, and adapting to the online batch testing needs of industrial production lines.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A testing device for online detection of the steel back length of brake pads, characterized in that, The device includes a controller, a testing platform (2), and a display module. The testing platform (2) is provided with a first limiting block (4), a second limiting block (5), and a clamping mechanism. The clamping mechanism is arranged opposite to the first limiting block (4) along the length direction of the steel back (3). The clamping mechanism includes a servo motor (6) and a clamping block (8). The output end of the servo motor (6) is connected to the clamping block (8) and drives the clamping block (8) to reciprocate toward the first limiting block (4) to press the steel back (3) against the first limiting block (4). The second limiting block (5) is located on one side of the testing platform (2) and is used to abut against the side of the steel back (3). The display module and the clamping mechanism are electrically connected to the controller.

2. The testing equipment for online detection of the steel back length of brake pads according to claim 1, characterized in that, The display module includes a display screen (1), a barcode scanner, and an alarm.

3. The testing equipment for online detection of the steel back length of brake pads according to claim 2, characterized in that, It also includes a support frame (13), which is disposed on the testing table (2). The first limiting block (4), the second limiting block (5) and the clamping mechanism are mounted on the support frame (13). The support frame (13) is provided with a guide groove (7), which extends along the length direction of the steel back (3). The clamping block (8) is movably disposed in the guide groove (7).

4. The testing equipment for online detection of the steel back length of brake pads according to claim 1, characterized in that, It also includes a slot detection mechanism, which is set on one side of the steel back slot (31) of the steel back (3). The slot detection mechanism includes a feed drive, a measuring head (9) and a stroke tolerance detection component. The output end of the feed drive is connected to the measuring head (9) and is used to drive the measuring head (9) to reciprocate in a direction close to or away from the steel back slot (31). The stroke tolerance detection component is used to detect the stroke state of the measuring head (9) and send the detection signal to the controller to determine whether the thickness of the steel back slot (31) is out of tolerance.

5. The testing equipment for online detection of the steel back length of brake pads according to claim 4, characterized in that, The feed drive is a cylinder (10) or a motor. The measuring head (9) is provided with a stepped measuring groove. The measuring groove includes an upper limit measuring groove (91) and a lower limit measuring groove (92) arranged sequentially along the detection direction. The groove width of the upper limit measuring groove (91) is adapted to the upper limit dimension of the thickness of the steel backing groove (31). The groove width of the lower limit measuring groove (92) is adapted to the lower limit dimension of the thickness of the steel backing groove (31). The groove width of the upper limit measuring groove (91) is greater than the groove width of the lower limit measuring groove (92).

6. The testing equipment for online detection of the steel back length of brake pads according to claim 5, characterized in that, The travel deviation detection component includes a first inductive switch (11) and a second inductive switch (12). The first inductive switch (11) and the second inductive switch (12) are arranged at intervals along the moving direction of the measuring head (9). The measuring head (9) is provided with corresponding sensing elements.

7. The testing equipment for online detection of the steel back length of brake pads according to claim 4, characterized in that, The card slot detection mechanism also includes a fixing clip (14), and the measuring head (9) is detachably mounted on the fixing clip (14).

8. The testing equipment for online detection of the steel back length of brake pads according to claim 1, characterized in that, The testing platform (2) is set horizontally or tilted, and the tilt angle of the testing platform (2) is 30°-60°.

9. A method for online automatic detection and recording of the length dimension of brake pad steel backing, using the equipment described in any one of claims 1 to 8, characterized in that, Includes the following steps: Measurement calibration: Place a gauge block of standard length on the testing table (2), so that one end of the gauge block abuts against the first limiting block (4), and the clamping block (8) of the clamping mechanism moves toward the gauge block. When the resistance of the clamping block (8) reaches the preset torque value, stop moving, read the displacement of the clamping block (8), and add the displacement to the length value of the gauge block to obtain the reference total length, thus completing the reference calibration; Steel back (3) positioning and identification: The steel back (3) to be tested is placed on the testing table (2), the barcode scanner reads the identification code on the steel back (3) for identification, and the controller automatically establishes the corresponding test record file according to the identification result; Steel back (3) length measurement: Place the steel back (3) to be measured on the testing table (2), so that one end of the steel back (3) abuts against the first limiting block (4), and the clamping block (8) of the clamping mechanism moves toward the other end of the steel back (3). When the resistance of the clamping block (8) reaches the preset torque value, stop moving and read the displacement of the clamping block (8). The controller calculates the steel back length dimension based on the difference between the reference total length and the displacement. Results display and recording: The controller sends the obtained length dimension of the steel back (3) to the display module (3) for display. At the same time, the data recording module automatically stores the length dimension data into the detection record file. If the length dimension of the steel back exceeds the preset tolerance range, an alarm signal is issued. Sorting: After the measurement is completed, the steel back (3) is sorted into qualified and unqualified products according to the test results.

10. The method for online automatic detection and recording of the length dimension of the brake pad steel backing according to claim 9, characterized in that, After measuring the length of the steel back, the steel back slot (31) is also detected: the feed drive drives the measuring head (9) to feed into the steel back slot (31) so that the stepped measuring slot matches the steel back slot (31); when the steel back slot (31) cannot be inserted into the upper limit measuring slot (91) of the measuring head (9), it is determined that the thickness of the steel back slot (31) is greater than the upper limit size; when the steel back slot (31) passes through the upper limit measuring slot (91) of the measuring head (9) and is inserted into the lower limit measuring slot (92) of the measuring head (9), it is determined that the thickness of the steel back slot (31) is less than the lower limit size. The travel error detection component is used to detect the actual travel displacement of the measuring head (9) during the detection process and transmit the detection signal to the controller; The controller determines the thickness detection result of the steel back slot (31) based on the comparison result between the actual travel displacement and the preset travel range, and sends the detection result to the display module for display.

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