A brake pad laser marking method

Abstract

The present invention discloses a brake pad laser marking method, comprising: obtaining a three-dimensional model of the brake pad; in response to the brake pad being placed on a conveyor belt, controlling the conveyor belt to carry the brake pad, and adjusting the position and angle of the brake pad during the transmission process; in response to the brake pad reaching the marking position, controlling each distance measuring sensor unit in the distance measuring sensor array to measure the distance of the brake pad, and obtaining multiple first distances; step S4, judging whether each first distance is consistent with the corresponding preset distance, if consistent, marking the surface of the brake pad, and controlling the laser transmitter head to move in the vertical direction according to the three-dimensional model of the brake pad so that the spot size of the laser transmitter head on the brake pad surface is always kept within the preset range; if inconsistent, controlling the conveyor belt to transport the brake pad away. The present invention can effectively solve the problem of slow brake pad marking speed and uneven depth of the marks.

Description

Technical Field

[0001] The invention relates to the field of laser marking, in particular to a brake block laser marking method. Background Art

[0002] Laser marking technology is one of the largest application areas of laser processing. Laser marking is a marking method that uses high-energy-density lasers to partially irradiate the workpiece, causing the surface material to vaporize or undergo a chemical reaction that changes color, thereby leaving a permanent mark. Laser marking can produce a variety of text, symbols, and patterns, and the character size can range from millimeters to micrometers, which is of special significance for product anti-counterfeiting.

[0003] As a car accessory, brake pads often need to be replaced due to their high wear and tear. Therefore, the output of brake pads is large, and corresponding brake pads need to be added with anti-counterfeiting marks or manufacturer information. It is difficult to preserve them for a long time by using glue or spray painting. Laser marking has the advantages of high precision, obvious marking, and long retention time. However, the surface of the brake pad that needs to be marked is often uneven, and the marking position is often not on the same plane. However, the focus of a common laser marking machine is generally on one plane. This situation makes it impossible for the focus with the highest power to continuously mark the brake pad, which leads to slow marking speed and uneven marking depth. Summary of the invention

[0004] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a brake pad laser marking method, aiming to ensure that the laser marking machine always marks the brake pad with the highest focus power, thereby solving the problems of slow marking speed and uneven depth of the marks.

[0005] To achieve the above object, the present invention discloses a brake pad laser marking method, the method is applied to a first laser marking machine, the first laser marking machine comprises: a conveyor belt, a laser emission head is arranged above the marking position of the conveyor belt, a distance sensor array is arranged on the side wall of the conveyor belt at the marking position, and the distance sensor array comprises a plurality of distance sensor units; the method comprises:

[0006] Step S1, obtaining a three-dimensional model of a brake pad; wherein the brake pad has a symmetrical structure and requires double-sided marking;

[0007] Step S2, in response to the brake shoe being placed on the conveyor belt, controlling the conveyor belt to carry the brake shoe, and adjusting the position and angle of the brake shoe during the transmission process;

[0008] Step S3, in response to the brake block reaching the marking position, controlling each of the distance measuring sensor units in the distance measuring sensor array to measure the distance of the brake block to obtain a plurality of first distances; wherein the first distance is the distance between the distance measuring sensor unit and the brake block;

[0009] Step S4, determine whether each of the first distances is consistent with its corresponding preset distance; if so, mark the surface of the brake pad, and control the laser transmitter to move in the vertical direction according to the three-dimensional model of the brake pad so that the spot size of the laser transmitter on the brake pad surface is always kept within a preset range; if not, control the conveyor belt to transport the brake pad away; wherein the preset distance is obtained by training the preset distance solution model.

[0010] Optionally, the training step of the preset distance solution model includes:

[0011] Step A, obtaining a first side view of the preset placement posture of the brake pad, taking the distance measuring sensor array as the observation side, obtaining the training distance measured by each distance measuring sensor unit in the distance measuring sensor array; wherein the training distance is the distance between each distance measuring sensor unit and the brake pad placed in the preset posture;

[0012] Step B, inputting the three-dimensional model of the brake pad, the first side view and the training distance into the preset distance solution model;

[0013] Step C, controlling the preset distance solution model to simulate the distance sensor array as an observer, adjusting the viewing angle of the three-dimensional model relative to the observer, obtaining the three-dimensional model view under each viewing angle, and obtaining the distance measurement value of each distance measurement sensor unit in the distance measurement sensor array; determining the three-dimensional model view in which all the distance measurement values ​​match the corresponding training distance as an alternative view; wherein the distance measurement value is the distance between each distance measurement sensor unit and the brake pad under each viewing angle;

[0014] Step D, determining whether the alternative view is unique and the same as the first side view, and if so, determining the training distance as the preset distance; if not, prompting to adjust the arrangement mode and / or arrangement quantity of the ranging sensor units in the ranging sensor array, and in response to the arrangement mode and / or arrangement quantity of the ranging sensor units being adjusted, repeating steps A to D in sequence.

[0015] Optionally, before step S4, the method further includes:

[0016] In response to the brake block reaching the marking position, the clamping arm is controlled to press against the brake block from one side so that the clamping arm and the side wall of the conveyor belt clamp the brake block; wherein the clamping arm is arranged opposite to the distance sensor array.

[0017] Optionally, the distance measuring sensor array is an infrared distance measuring sensor array, and the transmitting head of each distance measuring sensor unit in the infrared distance measuring sensor array is located on the side wall of the marking position of the conveyor belt.

[0018] Optionally, the step S2 of adjusting the position and angle of the brake block during the transmission process includes:

[0019] The mechanical pusher is controlled to push the brake block so that the brake block is closely attached to the side where the distance measuring sensor array is arranged; wherein, the position and angle of the brake block are changed during the pushing process.

[0020] Optionally, after step S4, the method further includes:

[0021] Determine whether the brake pad has been marked on both sides. If so, determine that the marking of the brake pad is completed; if not, turn the brake pad over and repeat steps S2-S4.

[0022] Optionally, in step S4, if each of the first distances does not match the corresponding preset distance, after controlling the conveyor belt to convey the brake pad away, the method further includes:

[0023] The brake blocks are rearranged and steps S2-S4 are repeated in sequence.

[0024] Optionally, the ranging direction of the ranging sensor array is perpendicular to the side wall of the conveyor belt.

[0025] Beneficial effects of the present invention: 1. The present invention obtains a three-dimensional model of a brake block; in response to the brake block being placed on a conveyor belt, the conveyor belt is controlled to carry the brake block, and the position and angle of the brake block are adjusted during the transmission process; in response to the brake block reaching the marking position, each distance measuring sensor unit in the distance measuring sensor array is controlled to measure the distance of the brake block to obtain multiple first distances; it is determined whether each first distance is consistent with the corresponding preset distance, if it is consistent, the surface of the brake block is marked, and the laser transmitter is controlled to move in the vertical direction according to the three-dimensional model of the brake block so that the spot size of the laser transmitter is always kept within the preset range on the surface of the brake block; if it is not consistent, the conveyor belt is controlled to transport the brake block away. First of all, the present invention first determines that the brake block is placed in a preset posture at the marking position through the distance measuring sensor array, and then marks the brake block according to the three-dimensional model of the brake block, so that the laser transmitter can adjust the vertical distance according to the concave and convex position of the brake block surface, so that the focus is always kept on the brake block surface, so that the brake block can obtain the maximum power and consistent laser marking, which ensures the consistency of the depth of the laser marking and improves the efficiency of laser marking. Secondly, the present invention can accurately mark the brake block by placing it in a preset posture and a three-dimensional model at the marking position, without relying on image recognition technology, thus lowering the technical threshold. 2. The present invention determines the marking placement posture of the brake block by an array of ranging sensors to ensure that the placement posture meets the requirements, which can effectively avoid the situation where the marking is crooked. 3. The present invention ensures that the brake block has a higher probability of meeting the placement posture requirements when it arrives at the marking position through the setting of a mechanical pusher and a clamping wall. In summary, the present invention can effectively ensure that the laser marking machine always marks the brake block with the highest power at the focus, solving the problems of slow marking speed and uneven depth of the marks. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic flow chart of a brake pad laser marking method provided by a specific embodiment of the present invention;

[0027] Figure 2 It is a flowchart of a training process of a preset distance solving model provided by a specific embodiment of the present invention;

[0028] Figure 3 It is a structural schematic diagram of a brake pad and a distance sensor array provided by a specific embodiment of the present invention;

[0029] Figure 4 It is a structural schematic diagram of a brake pad and a distance sensor array provided by another specific embodiment of the present invention. DETAILED DESCRIPTION

[0030] The present invention discloses a brake pad laser marking method. Those skilled in the art can refer to the content of this article and appropriately improve the technical details to achieve it. It should be particularly noted that all similar replacements and modifications are obvious to those skilled in the art, and they are all considered to be included in the present invention. The method and application of the present invention have been described through preferred embodiments, and relevant personnel can obviously modify or appropriately change and combine the methods and applications described herein without departing from the content, spirit and scope of the present invention to implement and apply the technology of the present invention.

[0031] The applicant has found through research that the surface of the brake pad that needs to be marked is often uneven, and the marking position is often not on the same plane. However, the focus of a conventional laser marking machine is generally on the same plane. This situation makes it impossible for the focus with the highest power to continuously mark the brake pad, which in turn leads to slow marking speed and uneven depth of the marks. Specifically, due to the uneven surface of the brake pad, the time required to mark the preset depth on the plane where the focus is located is significantly less than the time required to mark the preset depth on a plane not where the focus is located, which is the reason for the slow marking speed; in addition, if the marking is performed on planes that are not on the same plane for the same time, the difference in laser power will lead to uneven depth of the marks.

[0032] Therefore, an embodiment of the present invention provides a brake pad laser marking method, which is applied to a first laser marking machine, the first laser marking machine comprising: a conveyor belt, a laser emission head is arranged above the marking position of the conveyor belt, and a distance sensor array is arranged on the side wall of the conveyor belt at the marking position, wherein the distance sensor array comprises a plurality of distance sensor units; the method is specifically as follows Figure 1 As shown, including:

[0033] Step S1, obtaining a three-dimensional model of a brake shoe.

[0034] Among them, the brake pad has a symmetrical structure and needs to be marked on both sides.

[0035] It should be noted that brake blocks, also known as brake pads, are key parts in the brake components of electric vehicles and motorcycles.

[0036] Optionally, the three-dimensional model of the brake pad can be obtained by extraction scanning, or by obtaining it according to its design drawings.

[0037] Step S2, in response to the brake shoe being placed on the conveyor belt, controlling the conveyor belt to carry the brake shoe, and adjusting the position and angle of the brake shoe during the transmission process.

[0038] Optionally, in step S2, adjusting the position and angle of the brake block during the transmission process includes:

[0039] The mechanical pusher is controlled to push the brake block so that the brake block is closely attached to the side where the distance measuring sensor array is arranged; wherein, the position and angle of the brake block are changed during the pushing process.

[0040] It should be noted that the conveyor belt has a stable speed during the conveying process without sudden acceleration or deceleration, and the conveying speed is not affected when the mechanical pusher pushes the brake block.

[0041] Step S3, in response to the brake shoe arriving at the marking position, controlling each distance measuring sensor unit in the distance measuring sensor array to measure the distance of the brake shoe to obtain a plurality of first distances.

[0042] The first distance is the distance between the distance measuring sensor unit and the brake pad.

[0043] The schematic diagram of the distance sensor array and the brake pad can be shown as follows: Figure 3 and Figure 4 As shown, Figure 3 and Figure 4 In the figure, 301 is the side wall of the conveyor belt, 302 is the distance sensor array, 303 is the distance sensor unit, and 304 is the brake block. The dotted line represents the first distance between the distance sensor unit and the brake block. Figure 3 and Figure 4 In the embodiment, the ranging direction of the ranging sensor unit is perpendicular to the side wall 301.

[0044] Figure 3 The preset posture corresponding to the embodiment is a conventional placement posture, which has the advantages of being stable and not easy to slide.

[0045] Figure 4 The preset posture corresponding to the embodiment contacts the conveyor belt with the minimum contact area. On the one hand, it can expand its area in the vertical direction, making it easier for the distance sensor array to detect the brake pads, reducing the situation where the distance sensor unit measures empty. On the other hand, it can reduce the contact area with the conveyor belt. Because the surface of the brake pads is relatively rough, and the posture needs to be adjusted during transportation on the conveyor belt, if the contact area is too large, the rough surface can easily scratch the conveyor belt or damage the brake pads. Reducing the contact area with the conveyor belt can avoid this situation, and the smaller the contact surface, the more difficult the friction is, and it is easier to adjust the posture of the brake pads.

[0046] It should be noted that the distance measuring sensor units in the distance measuring sensor array may be arranged irregularly or regularly, and in actual application, the arrangement or quantity of the distance measuring sensor units may be changed according to requirements.

[0047] Step S4, determine whether each first distance is consistent with the corresponding preset distance. If it is consistent, mark the surface of the brake pad, and control the laser transmitter to move in the vertical direction according to the three-dimensional model of the brake pad so that the spot size of the laser transmitter on the brake pad surface is always kept within the preset range; if it is not consistent, control the conveyor belt to transport the brake pad away.

[0048] Among them, the preset distance is obtained by training the preset distance solution model.

[0049] It is worth mentioning that the spot size on the brake pad surface is always kept within the preset range in the embodiment of the present invention, which means that the focus is always kept on the brake pad surface. The preset range is used to ensure that the allowable error range in the actual application process does not affect normal use.

[0050] It should be noted that when the brake placement block is placed in different postures in the embodiment of the present invention, the distances from various positions on the brake block to the distance measuring sensor array cannot be completely consistent (the brake block in the embodiment of the present invention has a symmetrical structure and is marked on both sides, so the situation of placing it on the front and back is excluded, and only the various situations of placing it on one side are discussed). For example, if it is placed horizontally or vertically, there will inevitably be different distances from some positions to the distance measuring sensor array. Based on this point, the embodiment of the present invention can determine that the placement posture of the brake at the marking position is consistent with the preset placement posture. Combined with the three-dimensional model of the brake block, it can effectively adjust the vertical movement of the laser transmitter head so that the spot size of the laser transmitter head on the brake block surface is always maintained within the preset range.

[0051] The embodiment of the present invention can effectively keep the focus of the laser transmitter head on the surface of the brake pad and perform marking at the highest power at all times. While ensuring the marking efficiency, it also avoids the problem of uneven marking depth and improves the marking quality.

[0052] Optionally, in a specific embodiment, as Figure 2 As shown, the training steps of the preset distance solution model include:

[0053] Step A: obtaining a first side view of a preset placement posture of a brake pad, taking the distance measuring sensor array as an observation side, and obtaining a training distance measured by each distance measuring sensor unit in the distance measuring sensor array.

[0054] The training distance is the distance between each distance measuring sensor unit and the brake block placed in a preset posture.

[0055] It should be noted that the preset posture is the posture of the brake shoe that can be marked in the embodiment of the present invention. The first side view is a view of the brake shoe viewed from the side of the distance measuring sensor.

[0056] Step B: inputting the three-dimensional model of the brake pad, the first side view and the training distance into the preset distance solution model.

[0057] Step C, controlling the preset distance solution model to simulate the use of the ranging sensor array as the observer, adjusting the viewing angle of the three-dimensional model relative to the observer, obtaining the three-dimensional model views under various viewing angles, and obtaining the ranging values ​​of each ranging sensor unit in the ranging sensor array; and determining the three-dimensional model view whose all ranging values ​​match their corresponding training distances as the candidate view.

[0058] The distance measurement value is the distance between each distance measurement sensor unit and the brake pad at each viewing angle. There is at least one alternative view.

[0059] Step D, determining whether the alternative view is unique and the same as the first side view, and if so, determining the training distance as the preset distance; if not, prompting to adjust the arrangement mode and / or arrangement number of the ranging sensor units in the ranging sensor array, and in response to the arrangement mode and / or arrangement number of the ranging sensor units being adjusted, repeating steps A to D in sequence.

[0060] It should be noted that, in this embodiment, although different placement postures of the brake pads must have positions with different distances for the same distance-measuring sensor array, the number of distance-measuring sensing units in the distance-measuring sensor array is limited and cannot achieve comprehensive distance measurement, and there will be situations where the distances of the distance-measuring positions are all the same, while the distances of the unmeasured positions are different. Therefore, in the embodiment of the present invention, training is performed by using a preset distance solution model. Once there are multiple views that match the distance-measuring values ​​corresponding to the training distances, it means that the distances of the distance-measuring positions are all the same, while the distances of the unmeasured positions are different. At this time, the embodiment of the present invention changes the distance-measuring position by adjusting the arrangement mode and / or arrangement number of the distance-measuring sensing units in the distance-measuring sensor array until it is detected that the alternative view is unique and the same as the first side view. This ensures that it can be determined by distance measurement whether the brake pads are placed in the preset posture.

[0061] For example, when the brake pad is placed horizontally or vertically, the distances detected by the distance measuring sensor array at the three positions A, B, and C are the same. In this case, the number or arrangement of the distance measuring sensor units can be changed to detect the three positions A, B, and D, so that at least one of the measured distances is different.

[0062] In the above embodiments, the positions detected by the distance sensor array are all relative to the distance sensor unit, not fixed positions on the brake pad. That is, A, B, and C are just the distances detected by the distance sensor unit without moving, and the positions of A, B, and C in the brake pad structure are different when the brake pad is placed horizontally or vertically.

[0063] Optionally, before step S4, the method further includes:

[0064] In response to the brake block reaching the marking position, the clamping arm is controlled to press against the brake block from one side so that the clamping arm and the side wall of the conveyor belt clamp the brake block; wherein the clamping arm is arranged opposite to the distance measuring sensor array.

[0065] The embodiment of the present invention avoids the possibility of the brake block sliding during the marking process by clamping, thereby ensuring the accuracy of marking.

[0066] Optionally, the distance measuring sensor array is an infrared distance measuring sensor array, and the transmitting head of each distance measuring sensor unit in the infrared distance measuring sensor array is located on the side wall of the marking position of the conveyor belt.

[0067] It should be noted that infrared ranging sensors have the advantages of high precision and good stability, which can effectively avoid the problem of excessive ranging errors.

[0068] Optionally, after step S4, the method further includes:

[0069] Determine whether the brake pad has been marked on both sides. If so, determine that the marking of the brake pad is completed; if not, turn the brake pad over and repeat steps S2-S4.

[0070] It should be noted that the brake pad in the embodiment of the present invention needs to be marked on both sides, so it is necessary to determine whether the double-sided marking is completed to avoid the mixing of unmarked brake pads into the finished product.

[0071] In a specific embodiment, the flipping can be performed by controlling a robot.

[0072] Optionally, in step S4, if each first distance does not match the corresponding preset distance, then after controlling the conveyor belt to convey the brake pad away, the method further includes:

[0073] The brake blocks are rearranged and steps S2-S4 are repeated in sequence.

[0074] It should be noted that some brake blocks are not placed in the preset posture, so they cannot be marked at the required marked position, so they need to be rearranged and marked.

[0075] Optionally, the ranging direction of the ranging sensor array is perpendicular to the side wall of the conveyor belt.

[0076] The distance measurement direction is perpendicular to the side wall of the conveyor belt, which makes it easier to solve the preset distance.

[0077] In a specific application, the distance measuring direction may not be perpendicular to the side wall of the conveyor belt, but it should be kept in a constant direction, especially when adjusting the number and / or arrangement of the distance measuring sensor units.

[0078] The embodiment of the present invention obtains a three-dimensional model of a brake block; in response to the brake block being placed on a conveyor belt, the conveyor belt is controlled to carry the brake block, and the position and angle of the brake block are adjusted during the transmission process; in response to the brake block reaching the marking position, each distance measuring sensor unit in the distance measuring sensor array is controlled to measure the distance of the brake block to obtain multiple first distances; it is determined whether each first distance is consistent with the corresponding preset distance, if it is consistent, the surface of the brake block is marked, and the laser transmitter head is controlled to move in the vertical direction according to the three-dimensional model of the brake block so that the spot size of the laser transmitter head on the surface of the brake block is always kept within the preset range; if it is not consistent, the conveyor belt is controlled to convey the brake block away. Firstly, the embodiment of the present invention first determines that the brake block is placed in a preset posture at the marking position through the distance measuring sensor array, and then marks the brake block according to the three-dimensional model of the brake block, so that the laser transmitter head can adjust the vertical distance according to the concave and convex position of the brake block surface, so that the focus is always kept on the brake block surface, so that the brake block can obtain the maximum power and consistent laser marking, which ensures the consistency of the depth of the laser marking and improves the efficiency of laser marking. Secondly, the embodiment of the present invention can accurately mark the brake block by placing it in a preset posture and a three-dimensional model at the marking position, without relying on image recognition technology, thus lowering the technical threshold. The embodiment of the present invention determines the marking placement posture of the brake block through an array of ranging sensors to ensure that the placement posture meets the requirements, which can effectively avoid the situation where the marking is crooked. The embodiment of the present invention ensures that the brake block has a higher probability of meeting the placement posture requirements when it arrives at the marking position through the provision of a mechanical pusher and a clamping wall. In summary, the embodiment of the present invention can effectively ensure that the laser marking machine always marks the brake block with the highest power at the focus, solving the problem of slow marking speed and uneven depth of the marks.

[0079] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0080] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0081] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A brake pad laser marking method, characterized in that: The method is applied to a first laser marking machine, which comprises: a conveyor belt, a laser emission head is arranged above a marking position of the conveyor belt, a distance sensor array is arranged on a side wall of the conveyor belt at the marking position, and the distance sensor array comprises a plurality of distance sensor units; the method comprises: Step S1, obtaining a three-dimensional model of a brake pad; wherein the brake pad has a symmetrical structure and requires double-sided marking; Step S2, in response to the brake shoe being placed on the conveyor belt, controlling the conveyor belt to carry the brake shoe, and adjusting the position and angle of the brake shoe during the transmission process; Step S3, in response to the brake block reaching the marking position, controlling each of the distance measuring sensor units in the distance measuring sensor array to measure the distance of the brake block to obtain a plurality of first distances; wherein the first distance is the distance between the distance measuring sensor unit and the brake block; Step S4, determine whether each of the first distances is consistent with its corresponding preset distance; if so, mark the surface of the brake pad, and control the laser transmitter to move in the vertical direction according to the three-dimensional model of the brake pad so that the spot size of the laser transmitter on the brake pad surface is always kept within a preset range; if not, control the conveyor belt to transport the brake pad away; wherein the preset distance is obtained by training the preset distance solution model.

2. The brake pad laser marking method according to claim 1, characterized in that: The training steps of the preset distance solution model include: Step A, obtaining a first side view of the preset placement posture of the brake pad, taking the distance measuring sensor array as the observation side, obtaining the training distance measured by each distance measuring sensor unit in the distance measuring sensor array; wherein the training distance is the distance between each distance measuring sensor unit and the brake pad placed in the preset posture; Step B, inputting the three-dimensional model of the brake pad, the first side view and the training distance into the preset distance solution model; Step C, controlling the preset distance solution model to simulate the distance sensor array as an observer, adjusting the viewing angle of the three-dimensional model relative to the observer, obtaining the three-dimensional model view under each viewing angle, and obtaining the distance measurement value of each distance measurement sensor unit in the distance measurement sensor array; determining the three-dimensional model view in which all the distance measurement values ​​match the corresponding training distance as an alternative view; wherein the distance measurement value is the distance between each distance measurement sensor unit and the brake pad under each viewing angle; Step D, determining whether the alternative view is unique and the same as the first side view, and if so, determining the training distance as the preset distance; if not, prompting to adjust the arrangement mode and / or arrangement quantity of the ranging sensor units in the ranging sensor array, and in response to the arrangement mode and / or arrangement quantity of the ranging sensor units being adjusted, repeating steps A to D in sequence.

3. The brake pad laser marking method according to claim 1, characterized in that: Before step S4, the method further includes: In response to the brake block reaching the marking position, the clamping arm is controlled to press against the brake block from one side so that the clamping arm and the side wall of the conveyor belt clamp the brake block; wherein the clamping arm is arranged opposite to the distance sensor array.

4. The brake pad laser marking method according to claim 1, characterized in that: The distance measuring sensor array is an infrared distance measuring sensor array, and the transmitting head of each distance measuring sensor unit in the infrared distance measuring sensor array is located on the side wall of the marking position of the conveyor belt.

5. The brake pad laser marking method according to claim 1, characterized in that: The step S2 of adjusting the position and angle of the brake block during the transmission process includes: The mechanical pusher is controlled to push the brake block so that the brake block is closely attached to the side where the distance measuring sensor array is arranged; wherein, the position and angle of the brake block are changed during the pushing process.

6. The brake pad laser marking method according to claim 1, characterized in that: After step S4, the method further comprises: Determine whether the brake pad has been marked on both sides. If so, determine that the marking of the brake pad is completed; if not, turn the brake pad over and repeat steps S2-S4.

7. The brake pad laser marking method according to claim 1, characterized in that: In step S4, if each of the first distances does not match the corresponding preset distance, then after controlling the conveyor belt to convey the brake pad away, the method further includes: The brake blocks are rearranged and steps S2-S4 are repeated in sequence.

8. The brake pad laser marking method according to claim 1, characterized in that: The distance measuring direction of the distance measuring sensor array is perpendicular to the side wall of the conveyor belt.

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