Brake pad testing device and method

Abstract

The invention relates to the technical field of brake pad testing, in particular to a brake pad testing device and method, and the device comprises a testing table which is provided with a groove, a friction disc is rotatably arranged in the groove, the testing table is also provided with a detector, and the device also comprises a mounting seat which is arranged on the testing table; the connecting frame is rotationally connected to the mounting base, and the connecting frame is fixed to the brake pad; the positioning disc is fixed on the rotating shaft of the connecting frame, and a plurality of limiting blocks are fixed on the surface of the positioning disc; according to the invention, the magnetic positioning assembly is powered off, and the powered-off magnetic positioning assembly loses magnetism, so that positioning of the positioning disc can be canceled in time, at the moment, extra wear caused by gradual stopping of the friction disc can be reduced, and the influence on a test result is reduced.

Description

Technical Field

[0001] The present invention relates to the field of brake pad testing, and in particular to a brake pad testing device and method. Background Art

[0002] Brake pads, also called brake pads, are the most critical safety parts in the car's braking system. The quality of all braking effects is determined by the brake pads.

[0003] In the prior art, the friction disc is driven to rotate rapidly, and during the rotation process, the brake pad is gradually pressed against the friction disc to detect the wear degree of the friction disc; At the end of the wear test of the brake pad, it is usually necessary to gradually slow down the speed of the friction disc until the friction disc stops completely. This can avoid additional damage to the brake pad or friction disc caused by sudden stop. The higher the speed of the friction disc, the longer the time required. Waiting for the friction disc to stop completely wastes more time. In addition, as the friction disc gradually stops, it will cause additional wear to the brake pad, which is not conducive to ensuring the accuracy of the test results. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a brake pad testing device and method.

[0005] To achieve the above objectives, in a first aspect, the present invention provides a brake pad testing device, including a test bench, a groove is provided on the test bench, a friction disk is rotatably arranged in the groove, a detector is also provided on the test bench, and further includes: A mounting seat, the mounting seat is arranged on a test bench; A connecting frame, the connecting frame is rotatably connected to the mounting seat, and the connecting frame is fixed to the brake pad; A positioning plate, the positioning plate is fixed on the rotating shaft of the connecting frame, and a plurality of limit blocks are fixed on the surface of the positioning plate; A fixing ring, the fixing ring is fixed on the mounting seat, the fixing ring is sleeved on the outer side of the positioning plate, the fixing ring is provided with a magnetic positioning component, the magnetic positioning component is used to position the limit block, and the magnetic positioning component can promptly cancel the positioning of the limit block after power failure; It should be noted that the friction disc is coaxially fixed with the motor, and the friction disc can be driven to rotate by starting the motor. The detector can be a thickness detector or other detection device for detecting the degree of wear of the brake pad. This is the prior art and will not be described in detail here. The test process is as follows: the friction disc is driven to rotate rapidly. During the rotation, the brake pad is gradually pressed against the friction disc to detect the wear degree of the friction disc and complete the test; At the end of the test, it is usually necessary to gradually decelerate the speed of the friction disc until it stops completely. This can avoid additional damage to the brake pad or friction disc caused by sudden stop. The higher the speed of the friction disc, the longer the time required. Waiting for the friction disc to stop completely wastes more time. In addition, when the friction disc gradually stops, it will also cause additional wear on the brake pad, which is not conducive to ensuring the accuracy of the test results; The present invention can solve the above problems. The specific working method is as follows: the connection frame is positioned by cooperating with the positioning plate and the fixing ring to ensure the overall stability of the connection frame and the brake pad during the test, thereby ensuring the accuracy of the test results; When the test is completed and inspection is required, the power of the magnetic positioning component is turned off. After the power is turned off, the magnetic positioning component loses its magnetism and can cancel the positioning of the limit block in time, thereby canceling the positioning of the positioning plate and the connecting frame. At this time, the brake pad is in friction contact with the friction plate. Under the action of friction, the brake pad moves with the friction plate, driving the connecting frame to rotate on the mounting seat; At this time, pulling the brake pads away from the friction disc can reduce the additional wear caused by the friction disc gradually stopping, thereby reducing the impact on the test results; Moreover, this disengagement method does not need to wait for the friction disk to gradually stop, thereby saving waiting time and further facilitating faster testing.

[0006] Preferably, the magnetic positioning assembly comprises: A mounting groove, wherein the mounting groove is provided on the surface of the fixing ring; A positioning block, the positioning block is vertically inserted into the installation groove; A magnetic push mechanism, the magnetic push mechanism comprising two electromagnets, the two electromagnets are respectively fixed on the surfaces of the positioning block and the mounting slot, and a pulling spring is fixed between the two electromagnets; It should be noted that the pulling spring is made of non-magnetic material, such as a plastic spring, so as to avoid being affected by the magnetism of the magnetic push mechanism; When the magnetic push mechanism is powered on, the two electromagnets are in a repulsive state, so that the positioning block can be pushed toward the outside of the installation groove, so that the positioning block contacts the outer wall of the positioning plate. Specifically, two positioning blocks and two limiting blocks can be provided. The positioning block on the lower side is provided on the left side of the limiting block on the lower side to prevent the positioning plate from rotating clockwise, and the positioning block on the upper side is provided on the right side of the limiting block on the upper side to prevent the positioning plate from rotating counterclockwise, thereby maintaining the stability of the positioning plate. When it is necessary to cancel the positioning of the positioning disk, the power is cut off to the magnetic push mechanism to eliminate the repulsive effect between the two electromagnets. At this time, under the pulling action of the pulling spring, the positioning block can be retracted into the installation groove, thereby eliminating the obstruction of the limit block, and further canceling the positioning of the positioning disk. At this time, the positioning disk can rotate freely, so that the brake pad is in friction contact with the friction disk. Under the action of friction, the brake pad moves with the friction disk, so that the brake pad remains relatively stationary with the friction disk before it is separated from the friction disk, which is beneficial to reduce additional wear during the separation process.

[0007] In a second aspect, the present invention provides a brake pad testing method, the testing method comprising the following steps: A1. After the test is completed, control the electric push rod to pull the first stroke; A2. Obtain hole position information detected by the recognition component; A3. Select the rotation angle parameter of the rotating disk according to the hole position information; A4. Start the rotation of the rotating disk according to the rotation angle parameter and adjust the position of the positioning disk; Among them, the electric push rod pulls the first stroke to insert the elastic telescopic rod into the limiting hole, and then obtains the corresponding hole position information through the identification component to adjust the overall position of the rotating disk and the positioning disk. After the position adjustment is completed, the positioning disk is positioned by starting the magnetic positioning component. Finally, the electric push rod pushes the second stroke to disengage the elastic telescopic rod from the limiting hole, thereby facilitating the rotating disk to move away.

[0008] Compared with the prior art, the present invention has the following beneficial effects: 1. The connection frame is positioned by the positioning plate and the fixing ring to ensure the overall stability of the connection frame and the brake pad during the test, thereby ensuring the accuracy of the test results.

[0009] 2. When the test is completed and inspection is required, the power is cut off to the magnetic positioning component. After the power is cut off, the magnetic positioning component loses its magnetism and can cancel the positioning of the limit block in time, thereby canceling the positioning of the positioning plate and the connecting frame. At this time, the brake pad is in friction contact with the friction plate. Under the action of friction, the brake pad moves with the friction plate, driving the connecting frame to rotate on the mounting seat; at this time, pulling the brake pad to disengage from the friction plate can reduce the additional wear caused by the gradual stop of the friction plate, thereby reducing the impact on the test results. This disengagement method does not need to wait for the friction plate to stop gradually, thereby saving waiting time, which is conducive to speeding up the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 .

[0011] Figure 2 For the present invention Figure 2 A in the figure is an enlarged structural diagram.

[0012] Figure 3 The overall structure of the present invention is shown in FIG. Figure 2 (After the protective cover is removed).

[0013] Figure 4 The overall structure of the present invention is shown in FIG. Figure 3 (After the protective cover is removed).

[0014] Figure 5 For the present invention Figure 4 The enlarged structural diagram at B in FIG.

[0015] Figure 6 It is a schematic diagram of the cross-sectional structure of the fixing ring of the present invention.

[0016] Figure 7 For the present invention Figure 6 The enlarged structural diagram at C in the figure.

[0017] Figure 8 It is a schematic diagram of the positional relationship structure of the first gear and the second gear of the present invention.

[0018] Fig. 9 It is a structural schematic diagram of the connection relationship between the connecting frame and the brake pad of the present invention.

[0019] Fig.10 The structure of the positioning block and the limit block of the present invention is shown in FIG. Figure 1 (One way of implementing it).

[0020] Fig.11 The structure of the positioning block and the limit block of the present invention is shown in FIG. Figure 2 (Another implementation).

[0021] Fig.12 The figure is a flow chart of the testing method of the present invention.

[0022] In the figure: 1. test bench; 2. groove; 3. friction plate; 4. detector; 5. mounting seat; 6. connecting frame; 7. brake pad; 8. positioning plate; 9. limit block; 10. fixing ring; 11. motor; 12. mounting groove; 13. positioning block; 14. electromagnet; 15. pulling spring; 16. protective cover; 17. inlet and outlet; 18. elastic telescopic rod; 19. supporting frame; 20. electric push rod; 21. supporting ring; 22. rotating plate; 23. limit hole; 24. motor; 25. first gear; 26. second gear; 28. infrared sensor; 29. ​​inclined plane. DETAILED DESCRIPTION

[0023] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0024] like Figures 1 to 11 A brake pad testing device shown in the figure comprises a test bench 1, a groove 2 is provided on the test bench 1, a friction disc 3 is rotatably arranged in the groove 2, a detector 4 is also provided on the test bench 1, and further comprises: A mounting seat 5, the mounting seat 5 is arranged on the test bench 1; A connecting frame 6, the connecting frame 6 is rotatably connected to the mounting seat 5, and the connecting frame 6 is fixed to the brake pad 7; A positioning plate 8, the positioning plate 8 is fixed on the rotating shaft of the connecting frame 6, and a plurality of limit blocks 9 are fixed on the surface of the positioning plate 8; A fixing ring 10 is fixed on the mounting seat 5, and the fixing ring 10 is sleeved on the outer side of the positioning plate 8. A magnetic positioning component is provided on the fixing ring 10, and the magnetic positioning component is used to position the limit block 9, and the magnetic positioning component can promptly cancel the positioning of the limit block 9 after power failure; It should be noted that the friction disc 3 is coaxially fixed with the motor 11. By starting the motor 11, the friction disc 3 can be driven to rotate. The detector 4 can be a thickness detector 4 or other detection device for detecting the wear degree of the brake pad 7. This is the prior art and will not be described in detail here. The test process is as follows: by driving the friction disc 3 to rotate rapidly, during the rotation process, the brake pad 7 is gradually pressed against the friction disc 3 to detect the wear degree of the friction disc 3, and the test is completed; At the end of the test, it is usually necessary to gradually decelerate the speed of the friction disc 3 until the friction disc 3 stops completely, so as to avoid additional damage to the brake pad 7 or the friction disc 3 caused by sudden stop. The higher the speed of the friction disc 3, the longer the time required, and waiting for the friction disc 3 to stop completely wastes more time. In addition, in the process of the friction disc 3 gradually stopping, the brake pad 7 will also be additionally worn, which is not conducive to ensuring the accuracy of the test results; The present invention can solve the above problems. The specific working method is as follows: the connection frame 6 is positioned by the cooperation of the positioning plate 8 and the fixing ring 10 to ensure the overall stability of the connection frame 6 and the brake pad 7 during the test, thereby ensuring the accuracy of the test results; When the test is completed and inspection is required, the magnetic positioning component is powered off. After the power is turned off, the magnetic positioning component loses its magnetism and can cancel the positioning of the limit block 9 in time, thereby canceling the positioning of the positioning plate 8 and the connecting frame 6. At this time, the brake pad 7 is in friction contact with the friction plate 3. Under the action of friction, the brake pad 7 moves with the friction plate 3, driving the connecting frame 6 to rotate on the mounting seat 5. At this time, pulling the brake pad 7 away from the friction disc 3 can reduce the additional wear caused by the gradual stop of the friction disc 3, thereby reducing the impact on the test results; Furthermore, in the disengagement mode at this time, there is no need to wait for the friction disc 3 to gradually stop, thereby saving waiting time and further facilitating the speed of testing.

[0025] As a further embodiment of the present invention, the magnetic positioning assembly comprises: A mounting groove 12, the mounting groove 12 is provided on the surface of the fixing ring 10; A positioning block 13, the positioning block 13 is vertically inserted into the mounting groove 12; The magnetic push mechanism includes two electromagnets 14, which are respectively fixed on the surfaces of the positioning block 13 and the mounting slot 12, and a pulling spring 15 is fixed between the two electromagnets 14; It should be noted that the pulling spring 15 is made of non-magnetic material, such as a plastic spring, so as to avoid being affected by the magnetism of the magnetic push mechanism; When the magnetic push mechanism is powered on, the two electromagnets 14 are in a repulsive state, so that the positioning block 13 can be pushed toward the outside of the installation groove 12, so that the positioning block 13 contacts the outer wall of the positioning plate 8. Specifically, Fig.10 , Fig.11 As shown, two positioning blocks 13 and two limiting blocks 9 can be provided, the positioning block 13 located at the lower side is provided on the left side of the limiting block 9 at the lower side to prevent the positioning plate 8 from rotating clockwise, and the positioning block 13 located at the upper side is provided on the right side of the limiting block 9 at the upper side to prevent the positioning plate 8 from rotating counterclockwise, thereby maintaining the stability of the positioning plate 8, or the positioning block 13 and the limiting block 9 can be installed in the opposite manner; When it is necessary to cancel the positioning of the positioning disk 8, the power is cut off to the magnetic push mechanism to eliminate the repulsive effect between the two electromagnets 14. At this time, under the pulling action of the pulling spring 15, the positioning block 13 can be retracted into the installation groove 12, thereby eliminating the obstruction of the limit block 9, and further canceling the positioning of the positioning disk 8. At this time, the positioning disk 8 can rotate freely, so that the brake pad 7 is in friction contact with the friction disk 3. Under the action of friction, the brake pad 7 moves with the friction disk 3, so that the brake pad 7 remains relatively stationary with the friction disk 3 before disengaging from the friction disk 3, which is beneficial to reduce additional wear during the disengagement process.

[0026] As a further embodiment of the present invention, a protective cover 16 is also fixed on the test bench 1, and the protective cover 16 is arranged to cover the outer side of the friction disc 3, and the protective cover 16 is provided with an inlet and outlet 17 at a connection position; Among them, by setting the protective cover 16, sparks or flying debris generated during the test are blocked, which is beneficial to protect the test personnel; Furthermore, an inlet and outlet 17 is provided on one side of the protective cover 16 to facilitate the entry and exit of the brake pad 7 .

[0027] Because the brake pad 7 needs to move with the friction disc 3 and maintain a relatively static state before it is separated from the friction disc 3, therefore, in a test device without a protective cover 16, it is not necessary to consider the separation position of the brake pad 7 when it is separated; On the test device provided with the protective cover 16, the brake pad 7 needs to be aligned with the inlet and outlet 17 when disengaging. Thus, the present invention proposes the following implementation mode: an elastic telescopic rod 18 is fixed to the surface of the positioning plate 8, and an adjustment component adapted to the elastic telescopic rod 18 is provided at the inlet and outlet 17. The adjustment component is used to adjust the position of the connecting frame 6 after the brake pad 7 is disengaged from the friction plate 3. The adjustment component includes: A support frame 19, the support frame 19 is slidably connected to the side wall of the groove 2, an electric push rod 20 is provided on one side of the support frame 19, and a support ring 21 is provided at the end of the support frame 19; A rotating disk 22, the rotating disk 22 is rotatably connected in the supporting ring 21, and a plurality of limiting holes 23 are formed on the surface of the rotating disk 22; A driving assembly, the driving assembly is used to drive the rotating disk 22 to rotate; An identification component, which is used to identify the position of the limiting hole 23 into which the elastic telescopic rod 18 is inserted; It should be noted that the driving assembly includes a motor 24, which is fixed on the support frame 19, and a first gear 25 is fixed to the end of the output shaft of the motor 24, and a second gear 26 is meshed with one side of the first gear 25, and the second gear 26 is sleeved and fixed on the rotating disk 22; when in use, the first gear 25 is driven to rotate by starting the motor 24, the second gear 26 is driven to rotate by the first gear 25, and the rotating disk 22 is driven to rotate by the second gear 26, thereby completing the driving function; The identification component may use a sensor that can identify obstructions, such as an infrared sensor 28. The infrared sensor 28 is set on one side of each limiting hole 23. When the elastic telescopic rod 18 is inserted into the corresponding limiting hole 23, the infrared sensor 28 at the corresponding hole position can detect the obstruction, thereby determining which limiting hole 23 the elastic telescopic rod 18 is inserted into. Furthermore, when the elastic telescopic rod 18 contacts the rotating disk 22 and is not aligned with the limiting hole 23, the elastic telescopic rod 18 can first be retracted to make way, and then continue to move under its own rotation or gravity, and after reaching the position of the limiting hole 23, it can automatically extend under the action of elastic force and enter the limiting hole 23; When the elastic telescopic rod 18 enters the limiting hole 23, the hole position into which it is inserted is determined by the identification component. Since the angle at which each limiting hole 23 rotates to the highest point is determined, the angle value at which the rotating disk 22 needs to rotate can be determined by identifying the hole position, and then the rotating disk 22 is driven to rotate the specified angle value to adjust the elastic telescopic rod 18 to the highest position. Then, the magnetic push component is energized again to position the connecting frame 6 to ensure that the brake pad 7 can maintain a vertical state when it is moved out of the protective cover 16.

[0028] As a further embodiment of the present invention, the diameter of the limiting hole 23 is larger than the outer diameter of the elastic telescopic rod 18; Specifically, a larger aperture is conducive to reducing the difficulty of the elastic telescopic rod 18 to enter, so that the elastic telescopic rod 18 can quickly enter the corresponding limiting hole 23, thereby ensuring that the brake pad 7 can stop moving in time after being separated from the friction disc 3, reducing the removal time, and helping to speed up the test efficiency; Furthermore, when the elastic telescopic rod 18 is inserted into the limiting hole 23, due to the large diameter of the limiting hole 23, the position of the elastic telescopic rod 18 may be slightly offset, thereby causing the position of the positioning plate 8 to be slightly offset. Therefore, the present invention proposes the following implementation manner.

[0029] As a further embodiment of the present invention, the opposing surfaces of the positioning block 13 and the limiting block 9 are both inclined surfaces 29, wherein the inclined surfaces 29 on the upper and lower sides are in opposite directions; Specifically, by setting the inclined surface 29, when the elastic telescopic rod 18 is slightly offset, during the positioning process of the pushed positioning block 13, under the guidance of the inclined surface 29, the position of the limit block 9 can be automatically adjusted, so that the non-offset positioning disk 8 can be accurately reset, and then after replacing the brake pad 7, the accurate entry of the next brake pad 7 can be guaranteed, so that the relevant parameters of the next brake pad 7 are the same as the previous brake pad 7, such as the consistency of the braking position and the test position, thereby ensuring the repeatability of the test.

[0030] like Fig.12 A brake pad testing method is shown, the testing method comprising the following steps: A1. After the test is completed, the electric push rod 20 is controlled to pull the first stroke; A2. Obtain hole position information detected by the recognition component; A3. Select the rotation angle parameter of the rotating disk 22 according to the hole position information; A4. Start the rotating disk 22 to rotate according to the rotation angle parameter and adjust the position of the positioning disk 8; Among them, the electric push rod 20 pulls the first stroke to insert the elastic telescopic rod 18 into the limiting hole 23, and then obtains the corresponding hole position information through the identification component to adjust the overall position of the rotating disk 22 and the positioning disk 8. After the position adjustment is completed, the positioning disk 8 is positioned by starting the magnetic positioning component. Finally, the electric push rod 20 pushes the second stroke to disengage the elastic telescopic rod 18 from the limiting hole 23, thereby facilitating the rotating disk 22 to move away.

[0031] As a further embodiment of the present invention, the working method of the identification component comprises the following steps: Get occlusion information; Retrieve the number information of the detection position according to the occlusion information; Determine the hole position information according to the correspondence between the number information and the hole position; Among them, when the identification component is an infrared sensor 28, each hole position is provided with an infrared sensor 28. By numbering each infrared sensor 28 and corresponding the number to the hole position, for example, the infrared sensors 28 are numbered a, b, c, d, and the hole positions are numbered E, F, J, K, and the numbering relationship between the two corresponds one to one. When the infrared sensor 28 at position number a detects occlusion, the corresponding hole position is numbered E, thereby retrieving accurate hole position information.

[0032] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. A brake pad testing device, comprising a test bench (1), wherein the test bench (1) is provided with a groove (2), wherein a friction disc (3) is rotatably arranged in the groove (2), and wherein the test bench (1) is further provided with a detector (4), wherein: Also includes: A mounting seat (5), wherein the mounting seat (5) is arranged on the test bench (1); A connecting frame (6), the connecting frame (6) is rotatably connected to the mounting seat (5), and the connecting frame (6) is fixed to the brake pad (7); A positioning plate (8), the positioning plate (8) being fixed on the rotating shaft of the connecting frame (6), and a plurality of limit blocks (9) being fixed on the surface of the positioning plate (8); A fixing ring (10) is fixed on the mounting seat (5), the fixing ring (10) is sleeved on the outer side of the positioning plate (8), and a magnetic positioning component is provided on the fixing ring (10), the magnetic positioning component is used to position the limit block (9), and the magnetic positioning component can promptly cancel the positioning of the limit block (9) after power is cut off.

2. A brake pad testing device according to claim 1, characterized in that: The magnetic positioning assembly comprises: A mounting groove (12), wherein the mounting groove (12) is formed on a surface of the fixing ring (10); A positioning block (13), wherein the positioning block (13) is vertically inserted into the installation groove (12); A magnetic push mechanism, the magnetic push mechanism comprising two electromagnets (14), the two electromagnets (14) being fixed on the surfaces of a positioning block (13) and a mounting groove (12) respectively, and a pulling spring (15) being fixed between the two electromagnets (14).

3. A brake pad testing device according to claim 2, characterized in that: A protective cover (16) is also fixed on the test bench (1), and the protective cover (16) is arranged to cover the outside of the friction disc (3). The protective cover (16) is provided with an inlet and outlet (17) at a connection position.

4. A brake pad testing device according to claim 3, characterized in that: An elastic telescopic rod (18) is fixed to the surface of the positioning plate (8), and an adjustment component adapted to the elastic telescopic rod (18) is provided at the position of the inlet and outlet (17). The adjustment component is used to adjust the position of the connecting frame (6) after the brake pad (7) is separated from the friction plate (3), and the adjustment component comprises: A support frame (19), the support frame (19) being slidably connected to a side wall of the groove (2), an electric push rod (20) being provided on one side of the support frame (19), and a support ring (21) being provided at an end of the support frame (19); A rotating disk (22), the rotating disk (22) being rotatably connected in the supporting ring (21), and a plurality of limiting holes (23) being formed on the surface of the rotating disk (22); A driving assembly, the driving assembly being used to drive the rotating disk (22) to rotate; An identification component, the identification component is used to identify the position of the limiting hole (23) into which the elastic telescopic rod (18) is inserted.

5. A brake pad testing device according to claim 4, characterized in that: The diameter of the limiting hole (23) is larger than the outer diameter of the elastic telescopic rod (18).

6. A brake pad testing device according to claim 5, characterized in that: The opposing surfaces of the positioning block (13) and the limiting block (9) are both inclined surfaces (29), wherein the inclined surfaces (29) on the upper and lower sides are in opposite directions.

7. A brake pad testing method, applicable to a brake pad testing device according to any one of claims 1 to 6, characterized in that: The test method includes the following steps: A1. After the test is completed, the electric push rod (20) is controlled to pull the first stroke; A2. Obtain hole position information detected by the recognition component; A3. Select the rotation angle parameter of the rotating disk (22) according to the hole position information; A4. Start the rotating disk (22) to rotate according to the rotation angle parameter and adjust the position of the positioning disk (8).

8. A brake pad testing method according to claim 7, characterized in that: The working method of the identification component comprises the following steps: Get occlusion information; Retrieve the number information of the detection position according to the occlusion information; The hole position information is determined according to the correspondence between the numbering information and the hole position.

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