Detection tool for electronic wire harness

Abstract

The invention relates to a detection tool for an electronic wire harness, which is applied to the field of electronic wire harnesses, and utilizes a driving motor, a first rack and a second rack to drive pressing plates which are clamped up and down to move back to back, so that a rubbing and rotating effect is achieved on a wire harness which is clamped on the inner side and has a circular section, circumferential surface changing treatment of the wire harness is realized, and the detection efficiency is improved. The surface cracks on the surface of the arched wire harness can be detected and processed more comprehensively, the variable grinding piece can be overturned from bottom to top through cooperation of the variable grinding piece and the servo motor, the inner cracks of the wire harness can be detected in real time through the detection camera while the surface of the wire harness is ground, more comprehensive crack information is obtained, and the quality of the wire harness is improved. In addition, the winding motor, the gluing block and the magnetic rolling rod can be matched to achieve surface changing treatment of the wire harness with the rectangular cross section.

Description

Technical Field

[0001] The invention relates to an electronic wire harness detection tool, in particular to an electronic wire harness detection tool applied in the field of electronic wire harnesses. Background Art

[0002] Electronic wiring harness is a combination of wires used to connect various components in electronic products. It is an important component to ensure that current can flow and realize the function of the equipment. It is widely used in many fields, including the automotive industry, home appliances, medical equipment, industrial machinery, etc. The design of wiring harness in each field needs to take into account the specific use environment and safety requirements.

[0003] The specification of Chinese invention patent CN202310469359.2 discloses a wire harness detection device for new energy vehicles. The second detection mechanism drives the grinding belt by driving the cylinder to lift the wire harness upward, so as to observe whether there are small transverse cracks on the wire harness coating. The second detection mechanism drives the grinding belt to move radially along the wire harness through the second motor, and the third motor drives the grinding belt to move transversely, which is used to test the wear resistance of the wire harness coating and make the transverse cracks, radial cracks and oblique cracks of the wire harness coating more obvious.

[0004] When detecting cracks on the surface of a wire harness, existing wire harness detection equipment lifts up the wire harness to magnify the cracks for detection. However, crack detection can only be performed on the lifted surface, which is not comprehensive enough. Summary of the invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is how to perform a more comprehensive crack detection on the wire harness.

[0006] In order to solve the above problems, the present invention provides an electronic wire harness detection tool, including a detection bench, a No. 1 vertical plate and a No. 2 vertical plate are installed on the top of the detection bench, and the surfaces of the No. 1 vertical plate and the No. 2 vertical plate close to each other are both installed with extension slots, and the interior of the extension slot is slidably connected with a No. 2 electric extension rod, and the two No. 2 electric extension rods are connected by a support rod, and the top of the detection bench is provided with a slide corresponding to the extension slot, and the interior of the slide is slidably connected with a No. 3 electric extension rod, and the two No. 3 electric extension rods are connected by a long rod, and the power ends of the No. 3 electric extension rod and the No. 2 electric extension rod are both installed with a pressing plate;

[0007] A driving motor is installed on the top of the extension slot platform on the surface of the second vertical plate, and a gear is connected to the output end of the driving motor. The surface of the gear is meshed with a first rack and a second rack, wherein the end of the second rack away from the gear is connected to the surface of the second electric extension rod, and the end of the first rack away from the gear is connected to the surface of the third electric extension rod through a bracket;

[0008] The top of the inspection bench is symmetrically installed with electric rails located in front and behind the No. 1 vertical board and the No. 2 vertical board, and the No. 1 electric extension rod is installed inside the electric rails. The power end of the front No. 1 electric extension rod is connected to the No. 1 bracket, and the power end of the rear No. 1 electric extension rod is connected to the No. 2 bracket. Servo motors are installed through the inside of the No. 1 and No. 2 brackets, and the output ends of the servo motors are connected to the variable grinding parts through the extension rods. The tail end of the No. 1 bracket is installed with an inspection camera located above the inspection bench.

[0009] In the above-mentioned electronic wire harness detection tooling, the wire harness is subjected to circular surface changing treatment by rubbing and rotating the wire harness, thereby achieving a more comprehensive detection and treatment of surface cracks on the surface of the wire harness in an arched state.

[0010] As a further improvement of the present application, the variable grinding parts include grinding plate No. 1 and grinding plate No. 3. The lower end of grinding plate No. 1 is connected to grinding plate No. 2 through an axis rod. The surfaces of grinding plate No. 2 and grinding plate No. 3 close to each other are inlaid with electromagnetic strips, and the tops of grinding plates No. 1, No. 2 and No. 3 are all installed with an electrified layer.

[0011] As a further improvement of the present application, the length of the extension rod is smaller than the height difference between the servo motor and the detection camera, and the tail ends of the extension shafts at the output ends of the two servo motors are respectively connected to the surfaces of the No. 1 grinding plate and the No. 3 grinding plate.

[0012] As a further improvement of the present application, a power supply plug-in is installed on the top of the detection stand, and the power supply plug-in is located on the side of the No. 1 vertical plate away from the No. 2 vertical plate.

[0013] As a further improvement of the present application, grinding plate No. 1, grinding plate No. 2 and grinding plate No. 3 are all made of composite conductive abrasives and are connected to the power-carrying layer signal.

[0014] As a further improvement of the present application, it also includes a detection feedback system, which includes a processor installed on a detection stand, and the processor is connected to a detection module, a jacking module, a kneading module and a flipping and polishing module, wherein the detection module is connected to the detection camera signal for detecting the crack state on the surface of the electronic wire harness, the jacking module is connected to the No. 1 electric extension rod signal for controlling the jacking of the variable grinding part, the kneading module is connected to the drive motor signal for controlling the rotation of the electronic wire harness, and the flipping and polishing module is connected to the electromagnetic strip and the servo motor signal for controlling the flipping of the variable grinding part.

[0015] As another improvement of the present application, a winding motor is installed on one side of the bottom of the pressure plate connected to the power end of the No. 3 electric extension rod, the output end of the winding motor is connected to the winding rod, a traction rope is wrapped around the surface of the winding rod, and the tail end of the traction rope is connected to a bonding block, and a groove is provided on the top of the pressure plate connected to the power end of the No. 3 electric extension rod, an electromagnetic plate is installed on the bottom wall of the groove, and a magnetic roller with a diameter the same as the cross-sectional width of the groove is embedded in the inside of the groove.

[0016] As another improvement supplement of the present application, in the initial state, the top tangent point of the magnetic roller and the top of the groove are located on the same horizontal line, and the surface of the adhesive block is made of a silicone block with a removable adhesive coated on the surface.

[0017] To summarize, by utilizing the driving motor, rack No. 1 and rack No. 2, the upper and lower clamping pressure plates can be driven to move in reverse, thereby achieving a rubbing and rotating effect on the wire harness with a circular cross-section clamped on the inner side, thereby achieving a circular surface changing treatment of the wire harness, thereby achieving a more comprehensive detection and treatment of surface cracks on the surface of the wire harness in a raised state, and utilizing the cooperation of the variable grinding piece and the servo motor to achieve the flipping of the variable grinding piece from bottom to top, and while grinding the surface of the wire harness, the detection camera can detect the inner layer cracks of the wire harness in real time to obtain more comprehensive crack information, and the cooperation of the winding motor, the adhesive block and the magnetic roller can also be utilized to achieve the surface changing treatment of the wire harness with a rectangular cross-section. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is the overall appearance diagram of the first embodiment of the present application;

[0019] Figure 2 For this application Figure 1 A in the enlarged view;

[0020] Figure 3 This is an installation diagram of the second bracket and the servo motor of the first embodiment of the present application;

[0021] Figure 4 A side view of a detection stand according to a first embodiment of the present application;

[0022] Figure 5 This is a diagram of the first embodiment of the present application showing the wiring harness in a curved state when changing its surface;

[0023] Figure 6 This is the installation diagram of the second grinding plate and the energized layer of the first embodiment of the present application;

[0024] Figure 7 This is an installation diagram of the first grinding plate, the second grinding plate, the third grinding plate and the electromagnetic strip in the first embodiment of the present application;

[0025] Figure 8This is a schematic diagram of the process of turning the second grinding plate 180 degrees in the first embodiment of the present application;

[0026] Fig. 9 This is a diagram showing a 180-degree turning process of a variable abrasive member in the first embodiment of the present application;

[0027] Fig.10 This is an installation diagram of a pressing plate, a winding motor, a bonding block and a magnetic roller according to a second embodiment of the present application;

[0028] Fig.11 This is a state diagram of the adhesive block driving the wiring harness to flip over the surface in the second embodiment of the present application.

[0029] Description of the numbers in the figure:

[0030] 1. Inspection bench; 2. Power supply plug-in; 3. Vertical plate No. 1; 4. Vertical plate No. 2; 5. Electric guide rail; 6. Electric extension rod No. 1; 7. Variable grinding piece; 71. Grinding plate No. 1; 72. Grinding plate No. 2; 73. Grinding plate No. 3; 74. Electromagnetic strip; 75. Power-carrying layer; 8. Driving motor; 81. Rack No. 1; 82. Rack No. 2; 9. Electric extension rod No. 2; 10. Press plate; 11. Inspection camera; 12. Bracket No. 1; 13. Bracket No. 2; 14. Servo motor; 15. Electric extension rod No. 3; 16. Winding motor; 17. Magnetic roller; 18. Gluing block; 19. Electromagnetic plate. DETAILED DESCRIPTION

[0031] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0032] The first implementation method:

[0033] Figure 1 A testing tool for an electronic wire harness is shown, comprising a testing stand 1, a No. 1 vertical plate 3 and a No. 2 vertical plate 4 are installed on the top of the testing stand 1, and the surfaces of the No. 1 vertical plate 3 and the No. 2 vertical plate 4 close to each other are both installed with extension slots, and the interior of the extension slots is slidably connected with a No. 2 electric extension rod 9, and the two No. 2 electric extension rods 9 are connected by a support rod, and the top of the testing stand 1 is provided with a slide corresponding to the extension slot, and the interior of the slide is slidably connected with a No. 3 electric extension rod 15, and the two No. 3 electric extension rods 15 are connected by a long rod, and the power ends of the No. 3 electric extension rod 15 and the No. 2 electric extension rod 9 are both installed with a pressing plate 10;

[0034] Figure 2 As shown, a driving motor 8 is installed on the top of the extension slot platform on the surface of the second vertical plate 4, and a gear is connected to the output end of the driving motor 8. The surface of the gear is meshed with a first rack 81 and a second rack 82, wherein the end of the second rack 82 away from the gear is connected to the surface of the second electric extension rod 9, and the end of the first rack 81 away from the gear is connected to the surface of the third electric extension rod 15 through a bracket;

[0035] Figure 3 As shown, the top of the detection bench 1 is symmetrically installed with electric rails 5 located in front and behind the No. 1 vertical board 3 and the No. 2 vertical board 4, and the No. 1 electric extension rod 6 is installed inside the electric rails 5, wherein the power end of the front No. 1 electric extension rod 6 is connected to the No. 1 bracket 12, and the power end of the rear No. 1 electric extension rod 6 is connected to the No. 2 bracket 13, and the No. 1 bracket 12 and the No. 2 bracket 13 are both installed with servo motors 14, and the output end of the servo motor 14 is connected to the variable grinding part 7 through the extension rod, and the tail end of the No. 1 bracket 12 is installed with a detection camera 11 located above the detection bench 1.

[0036] Specifically, when testing an electronic wire harness with a circular cross section, the wire harness can first be passed through the through holes in the No. 1 vertical plate 3 and the No. 2 vertical plate 4, and then the No. 2 electric extension rod 9 and the No. 3 electric extension rod 15 are used to drive the two pressing plates 10 to approach each other until the wire harness is clamped and constrained, so that the wire harness is in a straightened state between the No. 1 vertical plate 3 and the No. 2 vertical plate 4;

[0037] When crack detection is performed, the electric guide rail 5 is used to drive the No. 1 bracket 12 to move horizontally, and drive the detection camera 11 to perform preliminary crack detection on the surface of the wire harness in a straight state. Then, the No. 1 electric extension rod 6 is started to drive the variable grinding piece 7 to lift up, so as to achieve a lifting and bending effect on the wire harness in a straight state (because the clamping effect of the pressure plate 10 on the wire harness is in the vertical direction and the clamping effect is controllable, the wire harness can still be pulled horizontally in the clamping state so that the wire harness can be arched upward and be in a straight state), thereby magnifying the cracks on the surface of the wire harness, which is convenient for the detection camera 11 to perform secondary supplementary detection;

[0038] Figure 5 It is shown that when a comprehensive inspection of cracks on the surface of the wiring harness is required, the drive motor 8 can be started, and under the mixed action of gear friction, the No. 1 rack 81 and the No. 2 rack 82 are driven away from each other, and then the No. 2 electric extension rod 9 and the No. 3 electric extension rod 15 are driven away from each other, thereby driving the two pressure plates 10 connected thereto to be in a rubbing state, which can drive the wire harness in the arched and straightened state to rotate, switch the direction of the wire harness to arch upward, and realize comprehensive processing of crack detection.

[0039] Figure 6-7 As shown, the variable grinding part 7 includes a grinding plate No. 1 71 and a grinding plate No. 3 73. The lower end of the grinding plate No. 1 71 is connected to the grinding plate No. 2 72 through an axle rod. The surfaces of the grinding plates No. 2 72 and No. 3 73 close to each other are inlaid with electromagnetic strips 74. The tops of the grinding plates No. 1 71, 72 and 73 are all installed with an electrified layer 75.

[0040] Figure 4It is shown that the length of the extension rod is smaller than the height difference between the servo motor 14 and the detection camera 11, and the tail ends of the extension shafts at the output ends of the two servo motors 14 are connected to the surfaces of the first grinding plate 71 and the third grinding plate 73 respectively.

[0041] A power supply plug-in 2 is installed on the top of the detection stand 1 , and the power supply plug-in 2 is located on the side of the first vertical plate 3 away from the second vertical plate 4 .

[0042] The first grinding plate 71 , the second grinding plate 72 and the third grinding plate 73 are all made of composite conductive abrasives and are signal-connected to the power-carrying layer 75 .

[0043] Specifically, when conducting the anti-wear test, the electric guide rail 5 can be used to drive the No. 1 electric extension rod 6 to move back and forth between the No. 1 vertical plate 3 and the No. 2 vertical plate 4 according to the set distance value, so as to achieve the grinding process. However, since the grinding surface and the detection camera 11 are blocked by the wire harness, it is inconvenient to check the cracks in the inner layer area of ​​the wire harness surface during the grinding process, so it is necessary to reverse the grinding operation;

[0044] Figure 8-9 As shown, when the grinding piece 7 needs to be flipped, the attraction between the two electromagnetic strips 74 can be released first, so that the second grinding plate 72 falls naturally, and then the servo motor 14 on the surface of the first bracket 12 is started to drive the first grinding plate 71 and the second grinding plate 72 to flip 180 degrees. The second grinding plate 72 gradually falls down and is flush with the surface of the first grinding plate 71 during the upward flipping process (in the flipping process, due to the length limitation of the extension rod, the second grinding plate 72 will not touch the detection camera 11), and then the servo motor 14 on the surface of the second bracket 13 is started to drive the third grinding plate 71 to rotate 180 degrees. After the plate 73 is flipped 180 degrees and kept at the same height as the second grinding plate 72, the electromagnetic strip 74 is restarted to achieve a stable connection between the second grinding plate 72 and the third grinding plate 73; then the first electric extension rod 6 is used to adjust the flipped variable grinding piece 7 to fit downward to the surface of the wire harness, and then with the cooperation of the electric guide rail 5, lateral movement grinding is performed, and the cracks in the inner layer of the wire harness are detected during the grinding process (because the detection field of the detection camera 11 is a trumpet-shaped design, the detection range when detecting cracks is larger than the cross-sectional size of the variable grinding piece 7 and will not be obscured);

[0045] During the wear resistance test, one end of the wiring harness can be electrically connected to the power supply plug 2. Therefore, when grinding to the wires in the wiring harness, a closed loop can be formed with the power-carrying layer 75, and then the power-carrying layer 75 is displayed. The number of times the variable grinding piece 7 grinds back and forth on the surface of the wiring harness is recorded, and then the wiring harness surface is rubbed and rotated. After switching the grinding surface, the grinding operation is repeated until the power-carrying layer 75 is displayed again. The number of times the variable grinding piece 7 grinds back and forth on the surface of the wiring harness is recorded again. The difference in the number of times each time is compared to see if it exceeds the set threshold. If so, the surface sheathing layer of the wiring harness is non-concentric (that is, the wrapping is inconsistent). Otherwise, it indicates that the sheathing layer of the wiring harness is uniformly wrapped around the internal wires.

[0046] It also includes a detection feedback system, which includes a processor installed on the detection stand 1, and the processor is connected to a detection module, a lifting module, a kneading module and a flipping and polishing module, wherein the detection module is connected to the detection camera 11 by signal, and is used to detect the crack state on the surface of the electronic wire harness, the lifting module is connected to the No. 1 electric extension rod 6 by signal, and is used to control the lifting of the variable grinding piece 7, the kneading module is connected to the drive motor 8 by signal, and is used to control the rotation of the electronic wire harness, and the flipping and polishing module is connected to the electromagnetic strip 74 and the servo motor 14 by signal, and is used to control the flipping of the variable grinding piece 7.

[0047] The second implementation method:

[0048] Fig.10 It is shown that a winding motor 16 is installed on one side of the bottom of the pressure plate 10 connected to the power end of the No. 3 electric extension rod 15, and the output end of the winding motor 16 is connected to the winding rod, and a traction rope is wrapped around the surface of the winding rod, and the tail end of the traction rope is connected to a bonding block 18. The top of the pressure plate 10 connected to the power end of the No. 3 electric extension rod 15 is provided with a groove, and an electromagnetic plate 19 is installed on the bottom wall of the groove, and a magnetic roller 17 with a diameter the same as the cross-sectional width of the groove is embedded in the inside of the groove.

[0049] In the initial state, the top tangent point of the magnetic roller 17 and the top of the groove are located on the same horizontal line, and the surface of the adhesive block 18 is made of a silicone block with a removable adhesive coated on the surface.

[0050] Different from the first embodiment, the present embodiment is aimed at the flipping of the electron beam with a rectangular cross-section, and the rubbing process of the first embodiment is not convenient for switching the detection surface of the electron beam with a rectangular cross-section.

[0051] Specifically, Fig.11It is shown that when the cross-section of the electronic wire harness to be detected is rectangular and needs to be flipped and switched, the upper pressure plate 10 can be lifted first, and then the electromagnetic plate 19 can be started to generate a force that repels the magnetic roller 17 to play a lifting role, so that the surface of the magnetic roller 17 protrudes from the surface of the pressure plate 10, and then the adhesive block 18 is bonded to the top of the wire harness, and then the winding motor 16 starts to wind, driving the wire harness to move and under the inflection point effect of the protruding magnetic roller 17, after flipping 90 degrees, the winding is stopped, and then the upper pressure plate 10 is lowered to continue squeezing (the bonding effect of the removable glue on the surface of the adhesive block 18 is strong, which is the same as the glue principle used for reusable labels).

[0052] In summary, the present application utilizes the driving motor 8, the No. 1 rack 81 and the No. 2 rack 82 to drive the upper and lower clamping pressure plates 10 to move in reverse, thereby achieving a rubbing and rotating effect on the wire harness with a circular cross-section clamped on the inner side, and realizing a circular surface changing treatment of the wire harness, thereby achieving a more comprehensive detection and treatment of the surface cracks on the surface of the wire harness in a raised state, and utilizing the cooperation of the variable grinding piece 7 and the servo motor 14 to realize the flipping of the variable grinding piece 7 from bottom to top, and while grinding the surface of the wire harness, the detection camera 11 can detect the inner layer cracks of the wire harness in real time to obtain more comprehensive crack information, and in addition, the winding motor 16, the bonding block 18 and the magnetic roller 17 can cooperate to realize the surface changing treatment of the wire harness with a rectangular cross-section.

[0053] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. An electronic wire harness detection tool, comprising a detection stand (1), characterized in that: A No. 1 vertical plate (3) and a No. 2 vertical plate (4) are installed on the top of the detection stand (1); surfaces of the No. 1 vertical plate (3) and the No. 2 vertical plate (4) close to each other are both installed with extension slots, the interior of the extension slots is slidably connected to a No. 2 electric extension rod (9), and the two No. 2 electric extension rods (9) are connected by a support rod; a slide groove corresponding to the extension slot is provided on the top of the detection stand (1); the interior of the slide grooves is slidably connected to a No. 3 electric extension rod (15), and the two No. 3 electric extension rods (15) are connected by a long rod; and the power ends of the No. 3 electric extension rod (15) and the No. 2 electric extension rod (9) are both installed with a pressing plate (10); A driving motor (8) is installed on the top of the extension groove platform on the surface of the second vertical plate (4), and the output end of the driving motor (8) is connected to a gear, and the surface of the gear is meshingly connected with a first rack (81) and a second rack (82), wherein the end of the second rack (82) away from the gear is connected to the surface of the second electric extension rod (9), and the end of the first rack (81) away from the gear is connected to the surface of the third electric extension rod (15) through a bracket; The top of the detection stand (1) is symmetrically provided with electric rails (5) located in front and behind the No. 1 vertical board (3) and the No. 2 vertical board (4), and the No. 1 electric extension rod (6) is installed inside the electric rails (5), wherein the power end of the No. 1 electric extension rod (6) in the front is connected to the No. 1 bracket (12), and the power end of the No. 1 electric extension rod (6) in the rear is connected to the No. 2 bracket (13), and the No. 1 bracket (12) and the No. 2 bracket (13) are both penetrated by servo motors (14), and the output end of the servo motor (14) is connected to a variable grinding part (7) through an extension rod, and the tail end of the No. 1 bracket (12) is installed with a detection camera (11) located above the detection stand (1).

2. The electronic wire harness detection tool according to claim 1, characterized in that: The variable grinding member (7) comprises a first grinding plate (71) and a third grinding plate (73); a lower end of the first grinding plate (71) is connected to a second grinding plate (72) via a shaft rod; surfaces of the second grinding plate (72) and the third grinding plate (73) close to each other are inlaid with electromagnetic strips (74); and the tops of the first grinding plate (71), the second grinding plate (72) and the third grinding plate (73) are all equipped with an electric conduction layer (75).

3. The electronic wire harness detection tool according to claim 2, characterized in that: The length of the extension rod is smaller than the height difference between the servo motor (14) and the detection camera (11), and the tail ends of the extension shafts at the output ends of the two servo motors (14) are respectively connected to the surfaces of the first grinding plate (71) and the third grinding plate (73).

4. The electronic wire harness detection tool according to claim 3, characterized in that: A power supply plug-in (2) is installed on the top of the detection stand (1), and the power supply plug-in (2) is located on the side of the first vertical board (3) facing away from the second vertical board (4).

5. The electronic wire harness detection tool according to claim 3, characterized in that: The first grinding plate (71), the second grinding plate (72) and the third grinding plate (73) are all made of composite conductive abrasives and are signal-connected to the power-carrying layer (75).

6. The electronic wire harness detection tool according to claim 5, characterized in that: It also includes a detection feedback system, which includes a processor installed on a detection stand (1), and the processor is connected to a detection module, a lifting module, a kneading module and a flipping and grinding module, wherein the detection module is connected to the detection camera (11) by signal, and is used to detect the crack state of the surface of the electronic wire beam, the lifting module is connected to the No. 1 electric extension rod (6) by signal, and is used to control the lifting of the variable grinding piece (7), the kneading module is connected to the drive motor (8) by signal, and is used to control the rotation of the electronic wire beam, and the flipping and grinding module is connected to the electromagnetic strip (74) and the servo motor (14) by signal, and is used to control the flipping of the variable grinding piece (7).

7. The electronic wire harness detection tool according to claim 1, characterized in that: A winding motor (16) is installed on one side of the bottom of the pressure plate (10) connected to the power end of the No. 3 electric extension rod (15), and the output end of the winding motor (16) is connected to the winding rod. A traction rope is wound around the surface of the winding rod, and the tail end of the traction rope is connected to a bonding block (18). The top of the pressure plate (10) connected to the power end of the No. 3 electric extension rod (15) is provided with a groove, and an electromagnetic plate (19) is installed on the bottom wall of the groove. A magnetic rod (17) with a diameter equal to the width of the groove cross section is embedded in the interior of the groove.

8. The electronic wire harness detection tool according to claim 7, characterized in that: In the initial state, the top tangent point of the magnetic rod (17) and the top of the groove are located on the same horizontal line, and the surface of the adhesive block (18) is made of a silicone block with a removable adhesive coated on the surface.

Images