Manufacturing method of acceleration switch based on double conducting strips
By using the electrical contact distance measuring device to detect the electrical contact distance before the conductive sheet is assembled, the problem of low pass rate of double-sheet conductive sheet assembly and adjustment is solved, the efficiency and pass rate of conductive sheet assembly and adjustment is improved, and the scrap rate of conductive sheet is reduced.
Patent Information
- Application Number
- CN202411924535.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2025-03-25
AI Technical Summary
In the prior art, the double-sheet conductive sheet has a low pass rate, resulting in a high scrap rate of conductive sheets and a safety hazard for multiple soldering wires.
Before assembly of conductive sheets, use an electrical contact distance measuring device to detect the electrical contact distance of the double-sheet conductive sheet, avoid repeated rework during assembly and adjustment, and improve the pass rate of conductive sheet assembly and adjustment.
By detecting the electrical contact distance in advance, it is effective to avoid damage to the conductive sheet caused by repeated welding wires and disassembly, improve the production and assembly efficiency of the acceleration switch, and reduce the scrap rate of the conductive sheet.
Smart Images
Figure CN119694819A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the field of precision electromechanical technology and relates to an acceleration switch, and in particular to a manufacturing method of an acceleration switch based on a double-sheet conductive sheet. Background Art
[0002] In small precision electromechanical products, acceleration switches are often used. This acceleration switch is mainly used for the on and off of electromechanical systems. An acceleration switch (also known as a g-value switch) is a device that can sense acceleration signals and is controlled by the acceleration threshold. Through the combined action of multiple forces, it performs a switch mechanical action to achieve the on and off of electrical appliances. Among the many components of an acceleration switch, the conductive sheet is one of the few main components; especially the double-sheet conductive sheet, which bears the on and off signal points of two sets of switch circuits, and its installation and adjustment process is relatively cumbersome.
[0003] In the prior art, the conductive sheet is usually left with a margin after the first processing, so it is necessary to install the conductive sheet on the acceleration switch to measure the electrical contact distance value S1; the value measured for the first time is usually inappropriate, so the conductive sheet needs to be removed and polished, and the positions of the gold sheet ends C and D of the conductive sheet will change after polishing. Since it is unclear how much the polishing will affect the distance value S1, it can only be reinstalled into the acceleration switch for internal measurement, a process called installation and adjustment.
[0004] For the installation and adjustment process of the double-piece conductive sheet, it is mostly carried out in batches. Taking 20 units as a small batch as an example, the installation and adjustment process and time are roughly as follows: the first step is polishing, that is, polishing the conductive sheet, which takes about 4 hours; the second step is cleaning, that is, cleaning the polished conductive sheet, which takes about 2 hours; the third step is installing the conductive sheet, that is, installing the conductive sheet in the switch, which takes about 1 hour; the fourth step is electrical welding wire, that is, welding the lead on the conductive sheet, which takes about 16 hours; the fifth step is installing the brush, that is, installing the brush on the switch, and the brush can contact the conductive sheet when moving, which takes about 3 hours; the sixth step is coarse adjustment of the G value, that is, moving the brush and roughly measuring the G value, which takes about 6 hours; the seventh step is testing the G value, which takes about 3 hours. Therefore, it takes about 35 hours to install the double-piece conductive sheet once, and it takes about 2 weeks to repeat the installation and adjustment after 4-5 reworks.
[0005] Based on the above-mentioned installation and adjustment process of the double-piece conductive sheet, the one-time installation and adjustment pass rate of the double-piece conductive sheet is low; if the double-piece conductive sheet does not meet the requirements, it is necessary to disassemble and rework the conductive sheet for many times, resulting in a high scrap rate of the conductive sheet and safety hazards caused by multiple welding wires. Summary of the invention
[0006] The purpose of the present invention is to solve the technical problems in the prior art of low qualified rate and high scrap rate of double-piece conductive sheets, and to provide a manufacturing method for an acceleration switch based on a double-piece conductive sheet. The method can detect the electrical contact distance between the two gold sheets before the conductive sheets are assembled, thereby avoiding repeated rework during assembly and adjustment, improving the qualified rate of conductive sheet assembly and adjustment, and reducing the scrap rate of conductive sheets.
[0007] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions: A method for manufacturing an acceleration switch based on a double-sheet conductive sheet comprises the following steps: Step 1, polishing the conductive sheet; Polishing the double-sheet conductive sheet; Step 2, cleaning the conductive sheet; Cleaning the polished double-sheet conductive sheet; Step 3, electrical contact distance measurement; An electrical contact distance measuring device is used to measure the electrical contact distance of the double-sheet conductive sheet; Step 4, installing the conductive sheet; Install the double-piece conductive sheet that has passed the electrical contact distance measurement in the acceleration switch; Step 5, electrical welding wire; Welding leads onto the double-sheet conductive sheet to complete the manufacture of the switch; Wherein, the electrical contact distance measuring device comprises a housing, in which an electrical contact distance measuring mechanism is arranged; The electrical contact distance measuring mechanism includes a translation base and a mounting base installed on one side of the translation base. A moving block that can move along the length direction of the translation base is arranged on the translation base, and a brush is installed on the moving block. Fixed clamps for clamping the double-piece conductive sheet are arranged on both sides of the connecting end of the mounting base, and a rotating block is hinged at the free end of the mounting base. A normally closed point gold wire and a normally open point gold wire are respectively arranged on the left and right of the rotating block.
[0008] Furthermore, in step 3, when the electrical contact distance measuring device is used to measure the electrical contact distance of the double-sheet conductive sheet, the specific steps are as follows: Step 3-1, reset; The moving block moves to the initial position A, and the brush moves out of the area where the double-sheet conductive sheet is located; the rotating block flips outward, so that the ends of the normally closed point gold wire and the normally open point gold wire move out of the area where the double-sheet conductive sheet is located; Step 3-2, installing the conductive sheet; Press the clamp switch, the fixed clamp opens, and the double-sheet conductive sheet is placed in; release the clamp switch, and the fixed clamp clamps the double-sheet conductive sheet; the rotating block flips inward, and the normally closed point gold wire and the normally open point gold wire contact the gold sheets at both ends of the double-sheet conductive sheet; Step 3-3, testing the electrical contact distance; The moving block moves from the initial position A to the end position B, and the brush contacts and moves with the double-sheet conductive sheet; when the brush is separated from the first gold sheet of the double-sheet conductive sheet, the distance value of the disconnection point C is recorded, and when the brush just contacts the second gold sheet of the double-sheet conductive sheet, the distance value of the connection point D is recorded; The brush is reset to the initial position; Step 3-4, check whether the polishing is qualified; The rotating block is turned outward, so that the ends of the normally closed point gold wire and the normally open point gold wire are out of contact with the double-piece conductive sheet; the clamping claw switch is pressed, the fixed clamping claw opens, and the double-piece conductive sheet is taken out; According to the distance value recorded at the disconnection point C and the distance value recorded at the connection point D, determine whether the double-sheet conductive sheet has passed the polishing test; if not, re-polish the removed double-sheet conductive sheet and repeat steps 3-1 to 3-3 until the polishing test is passed.
[0009] The beneficial effects of the present invention are as follows: In the present invention, a fixed clamp and an electrical contact distance measuring mechanism are provided in the measuring device, the double-sheet conductive sheet is clamped on the device by the fixed clamp, and then the brush is moved by the measuring mechanism, the brush contacts the gold sheet on one side and gradually contacts the insulator in the middle and the gold sheet on the other side during the movement, so as to measure the electrical contact distance of the double-sheet conductive sheet; when it is measured that the electrical contact distance of the double-sheet conductive sheet does not meet the requirements, the fixed clamp can be loosened to remove the conductive sheet, and polishing is continued, and then testing is performed after polishing until the electrical contact distance of the conductive sheet after polishing meets the requirements. Requirement: During the polishing process, the double-sheet conductive sheet is polished and measured at the same time, which realizes the measurement of the electrical contact distance of the conductive sheet during the polishing stage. Before the conductive sheet is installed on the acceleration switch, it can be judged in advance whether the polished conductive sheet is qualified, and the conductive sheet with inappropriate distance can be processed on site, which effectively avoids damage to the conductive sheet caused by repeated welding and removal of wires, and effectively avoids repeated installation of the conductive sheet on the acceleration switch, installation of brushes and repeated disassembly, greatly improving the production and assembly efficiency of the acceleration switch (calculated and counted based on 20 units / batch, the efficiency is at least increased by three times). BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 It is a schematic diagram of the process of the present invention; Figure 2 It is a schematic diagram of the process of measuring the electrical contact distance in the present invention; Figure 3 It is a structural schematic diagram of the electrical contact distance measuring device in the present invention; Figure 4 It is a structural schematic diagram of the electrical contact distance measuring mechanism in the present invention; Figure 5is a rear view of the electrical contact distance measuring mechanism of the present invention; Figure 6 It is a schematic diagram of the structure of the double-sheet conductive sheet in the present invention; Figure 7 It is a schematic diagram of the structure of the fixed clamping jaw in the present invention; Figure 8 It is a schematic diagram of the installation of the brush in the present invention; Fig. 9 It is a driving schematic diagram of the fixed clamping jaw in the present invention; Wherein, the accompanying drawings are marked as follows: 1-button, 2-shell, 3-electric contact distance measuring mechanism, 4-groove, 5-display screen, 31-mounting base, 32-rotating block, 33-normally closed point gold wire, 34-normally open point gold wire, 35-brush, 36-double-piece conductive sheet, 37-moving block, 38-fixed clamping claw, 39-screw, 310-translational base, 311-hinge shaft, 312-drive motor, 313-drive rod, 314-reset spring, 315-guide column, 316-brush holder, 317-fixed seat, 318-connecting rod, 361-waist groove, 362-first gold sheet, 363-insulator, 364-second gold sheet, 365-lead wire mounting seat, 381-rod body, 382-raised claw tip. DETAILED DESCRIPTION
[0011] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.
[0012] Therefore, based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.
[0013] First, we need to explain the electrical contact distance. The electrical contact distance is defined as: the position where the brush touches the gold sheet is called the electrical contact point, and the position where the brush leaves the previous gold sheet (the first electrical contact point, such as Figure 3 Point C as shown) until the brush contacts the next gold sheet (the second electrical contact point, such as Figure 3 The distance between these two points is called the electrical contact distance.
[0014] Next, the specific structure of the double-piece conductive sheet 36 is described. The double-piece conductive sheet 36 includes a bottom plate, waist-shaped grooves 361 are provided at both ends of the bottom plate, an insulator 363 is provided on the top surface of the bottom plate, a first gold sheet 362 and a second gold sheet 364 are provided on both sides of the insulator 363, and lead wire mounting seats 365 are provided on the sides of both ends of the bottom plate. The lead wires of the acceleration switch pass through the holes on the lead wire mounting seats 365 and are welded to the first gold sheet 362 and the second gold sheet 364.
[0015] Example 1 This embodiment provides a method for manufacturing an acceleration switch based on a double-sheet conductive sheet, comprising the following steps: Step 1, polishing the conductive sheet; Polishing the double-sheet conductive sheet 36; Step 2, cleaning the conductive sheet; Cleaning the polished double-sheet conductive sheet 36; Step 3, electrical contact distance measurement; The electrical contact distance measuring device is used to measure the electrical contact distance of the double-sheet conductive sheet 36; Step 4, installing the conductive sheet; Install the double-piece conductive sheet 36 that has passed the electrical contact distance measurement in the acceleration switch; Step 5, electrical welding wire; Lead wires are welded to the two-piece conductive sheet 36 to complete the manufacture of the switch.
[0016] In step 3, when the electrical contact distance measuring device is used to measure the electrical contact distance of the double-sheet conductive sheet, the specific steps are as follows: Step 3-1, reset; The moving block 37 of the electrical contact distance measuring device moves to the initial position A, and the brush 35 of the electrical contact distance measuring device moves out of the area where the double-sheet conductive sheet 36 is located; the rotating block 32 of the electrical contact distance measuring device flips outward, so that the ends of the normally closed point gold wire 33 and the normally open point gold wire 34 of the electrical contact distance measuring device move out of the area where the double-sheet conductive sheet 36 is located; Step 3-2, installing the conductive sheet; Press the clamp switch 313 of the electrical contact distance measuring device, the fixed clamp 38 of the electrical contact distance measuring device opens, and the double-piece conductive sheet 36 is placed in; release the clamp switch 313, the fixed clamp 38 clamps the double-piece conductive sheet 36; the rotating block 32 turns inward, and the normally closed point gold wire 33 and the normally open point gold wire 34 contact the gold sheets at both ends of the double-piece conductive sheet 36; Step 3-3, testing the electrical contact distance; The moving block 37 moves from the initial position A to the final position B, and the brush 35 contacts and moves with the double-sheet conductive sheet 36; when the brush 35 is separated from the first gold sheet 362 of the double-sheet conductive sheet 36, the distance value of the disconnection point C is recorded, and when the brush 35 just contacts the second gold sheet 364 of the double-sheet conductive sheet 36, the distance value of the connection point D is recorded; The brush 35 is reset to the initial position; Step 3-4, check whether the polishing is qualified; The rotating block 32 is turned outward, so that the ends of the normally closed point gold wire 33 and the normally open point gold wire 34 are out of contact with the double-piece conductive sheet 36; the clamping claw switch 313 is pressed, the fixed clamping claw 38 is opened, and the double-piece conductive sheet 36 is taken out; According to the distance value recorded at the disconnection point C and the distance value recorded at the connection point D, it is determined whether the double-sheet conductive sheet 36 has passed the polishing. If not, the removed double-sheet conductive sheet 36 is re-polished, and steps 3-1 to 3-3 are repeated until the polishing is qualified.
[0017] Example 2 This embodiment provides a specific structure of an electrical contact distance measuring device.
[0018] The electrical contact distance measuring device comprises a housing 2, in which an electrical contact distance measuring mechanism 3 for measuring the electrical contact distance is arranged. A plurality of buttons 1 are arranged in the lower left area of the top surface of the housing 2, and these buttons 1 include a switch button (for turning on or off the measuring device), a left button (for controlling the brush 35 to move to the left), a right button (for controlling the brush 35 to move to the right), a stop button (for controlling the brush 35 to stop moving), and an automatic button (for controlling the brush 35 to move automatically according to a set program). A display screen 5 is arranged in the upper right area of the top surface of the housing 2, and the display screen 5 is electrically connected to the single-chip microcomputer in the housing 2, and is used to display the value (i.e., the electrical contact distance) obtained after calculation by the single-chip microcomputer program. In addition, a corresponding groove 4 is provided in the lower right corner area of the top surface of the shell 2 corresponding to the electrical contact distance measuring mechanism 3. The groove 4 corresponds to the area where the double-piece conductive sheet 36 is placed in the electrical contact distance measuring mechanism 3, the moving area of the brush 35 and the pressing area of the driving rod 313. Part of the structure of the electrical contact distance measuring mechanism 3 can extend out of the groove, so as to facilitate the placement of the double-piece conductive sheet 36, the viewing of the movement of the brush 35 and the clamping and releasing of the fixed clamp 38.
[0019] The electrical contact distance measuring mechanism 3 includes a translation base 310 and a mounting base 31 mounted on one side of the translation base 310. The mounting base 31 and the translation base 310 are both mounted on the inner bottom surface of the housing 2. In order to facilitate the movement of the driving brush 35, a moving block 37 that can move along the length direction of the translation base 310 is provided on the translation base 310, and the brush 35 is mounted on the moving block 37. This embodiment provides a specific structure for driving the brush 35 to move, that is, the translation base 310 is set as a circular frame, and at least the middle area of the top surface of the circular frame is recessed inward to form a rectangular parallelepiped groove. A lead screw 39 and a guide column 315 are provided in the length direction of the circular frame, the lead screw 39 is located at the upper center position, and two guide columns 315 are located on both sides below the lead screw 39. The moving block 37 is sleeved on the lead screw 39 and the guide column 315, and the moving block 37 is threadedly connected to the lead screw 39. In addition, a driving motor 312 is also provided on the side of the circular frame, and the output shaft of the driving motor 312 is connected to the lead screw 39. When the driving motor 312 drives the lead screw 39 to rotate, the moving block 37 threadedly connected to the lead screw 39 will move along the axial direction of the lead screw 39, thereby driving the brush 35 to move. In order to facilitate the adjustment of the position of the brush 35 so that it can effectively contact the double-sheet conductive sheet 36, a fixing seat 317 is installed on the top surface of the moving block 37, and a brush holder 316 is hinged on the fixing seat 317. One end of the brush 35 is installed on the brush holder 316, and the other end of the brush 35 is a free end; the brush holder 316 can rotate on the fixing seat 317, thereby adjusting the inclination angle of the brush 35, so that the free end of the brush 35 can effectively contact the double-sheet conductive sheet 36 and conduct the corresponding circuit.
[0020] Fixed clamps 38 are provided on both sides of the connection end of the mounting base 31, and the fixed clamps 38 are located on both sides of the placement area of the double-sheet conductive sheet 36. When the double-sheet conductive sheet 36 is placed in the placement area, the fixed clamps 38 on both sides move toward the middle and clamp the double-sheet conductive sheet 36 (i.e., the double-sheet conductive sheet 36 is tightly held from both sides and fixed to the placement area of the mounting base 31). The fixed clamps 38 include a rod body 381, the middle part of which is hinged to the translation base 310 or the mounting base 31 through a hinge shaft 311, and a protruding claw tip 382 is provided on the top of the rod body 381 on one side close to the double-sheet conductive sheet 36. When the rod body 381 rotates around the hinge shaft 311, the fixed clamp 38 can hold the double-piece conductive sheet 36 through the protruding claw tip 382 at its end (of course, ribs can also be provided on the rod body 381 at positions corresponding to the waist-shaped grooves 361; when the fixed clamp 38 holds the double-piece conductive sheet 36, the ribs on the rod body 381 are inserted into the waist-shaped grooves 361).
[0021] In order to enable the rod body 381 to be better reset after rotation, a reset spring 314 is arranged at the bottom of the rod body 381, one end of the reset spring 314 abuts against the bottom of the rod body 381, and the other end of the reset spring 314 abuts against the mounting base 31; when it is necessary to place the double-leaf conductive sheet 36 or loosen the double-leaf conductive sheet 36 and take out the double-leaf conductive sheet 36, the fixed clamp 38 rotates and compresses the reset spring 314; after placing or removing the double-leaf conductive sheet 36, the reset spring 314 restores its deformation and pushes the fixed clamp 38 to rotate in the opposite direction.
[0022] In order to better drive the fixed clamp 38 to rotate, a clamp driving mechanism is also provided on the outer side of the rod body 381, and the clamp driving mechanism includes a driving rod 313, the upper end of the driving rod 313 passes through the shell 2 through the hole on the top surface of the shell 2, and the lower end of the driving rod 313 is hinged with a connecting rod 318, and the other end of the connecting rod 318 is fixedly connected to the bottom of the rod body 381 (that is, the inner side of the connecting rod 318 abuts against the return spring 314, and the outer side of the connecting rod 318 is fixedly connected to the connecting rod 318). When it is necessary to drive the fixed clamping jaw 38 to rotate through the clamping jaw driving mechanism, under the action of the through hole of the shell 2, the driving rod 313 can only move up and down; when the driving rod 313 is pressed downward, the downward-moving driving rod 313 will drive the L-shaped structure composed of the connecting rod 318 and the rod body 381 to rotate around the hinge axis 311 as a whole, the reset spring 314 is compressed, and the two protruding claw tips 382 move back to back, so that the double-piece conductive sheet 36 can be inserted or removed; then the pressure on the top of the driving rod 313 is cancelled, the reset spring 314 restores its deformation, the L-shaped structure composed of the connecting rod 318 and the rod body 381 as a whole rotates in the opposite direction around the hinge axis 311, the driving rod 313 moves upward, and the two protruding claw tips 382 move toward each other, thereby clamping the double-piece conductive sheet 36.
[0023] A rotating block 32 is also hinged at the free end of the mounting base 31, and a normally closed point gold wire 33 and a normally open point gold wire 34 are respectively arranged on the left and right of the rotating block 32. When the rotating block 32 rotates (clockwise as shown in 2), the normally closed point gold wire 33 and the normally open point gold wire 34 rotate together, and the free ends of the normally closed point gold wire 33 and the normally open point gold wire 34 are respectively pressed on the first gold sheet 362 and the second gold sheet 364 and effectively contact; when it is necessary to break contact, the rotating block 32 can be rotated in the opposite direction.
[0024] In addition, a single-chip microcomputer is also provided in the shell 2, and the single-chip microcomputer is electrically connected to the normally closed gold wire 33 and the normally open gold wire 34 through the lead J1 and the lead J2 respectively. The single-chip microcomputer is also electrically connected to the brush 35 through the lead D1, thereby forming a closed loop of "single-chip microcomputer-lead J1-normally closed gold wire 33-double-sheet conductive sheet 36-brush 35-lead D1-single-chip microcomputer" and a closed loop of "single-chip microcomputer-lead J2-normally open gold wire 34-double-sheet conductive sheet 36-brush 35-lead D1-single-chip microcomputer". By moving the brush 35, one of the two circuits is closed and the other circuit is disconnected (of course, if the brush 35 contacts the insulator 363, the two circuits will be disconnected at the same time), and finally the electrical contact distance of the double-sheet conductive sheet 36 is measured.
Claims
1. A method for manufacturing an acceleration switch based on a double-sheet conductive sheet, characterized in that: The following steps are involved: Step 1, polishing the conductive sheet; Polishing the double-sheet conductive sheet (36); Step 2, cleaning the conductive sheet; Cleaning the polished double-sheet conductive sheet (36); Step 3, electrical contact distance measurement; Using an electrical contact distance measuring device to measure the electrical contact distance of the double-sheet conductive sheet (36); Step 4, installing the conductive sheet; Installing a double-piece conductive sheet (36) that passes the electrical contact distance measurement in the acceleration switch; Step 5, electrical welding wire; Welding leads onto the double-sheet conductive sheet (36) to complete the manufacture of the switch; The electrical contact distance measuring device comprises a housing (2), and an electrical contact distance measuring mechanism (3) is arranged in the housing (2); The electrical contact distance measuring mechanism (3) comprises a translation base (310) and a mounting base (31) mounted on one side of the translation base (310); a moving block (37) movable along the length direction of the translation base (310) is arranged on the translation base (310); a brush (35) is mounted on the moving block (37); fixed clamping claws (38) for clamping a double-sheet conductive sheet (36) are arranged on both sides of the connection end of the mounting base (31); a rotating block (32) is hingedly connected to the free end of the mounting base (31); and a normally closed point gold wire (33) and a normally open point gold wire (34) are respectively arranged on the left and right of the rotating block (32).
2. The method for manufacturing an acceleration switch based on a double-sheet conductive sheet according to claim 1, characterized in that: In step 3, when the electrical contact distance measuring device is used to measure the electrical contact distance of the double-sheet conductive sheet (36), the specific steps are as follows: Step 3-1, reset; The moving block (37) moves to the initial position A, and the brush (35) moves out of the area where the double-piece conductive sheet (36) is located; the rotating block (32) flips outward, so that the ends of the normally closed point gold wire (33) and the normally open point gold wire (34) move out of the area where the double-piece conductive sheet (36) is located; Step 3-2, installing the conductive sheet; The clamping jaw switch (313) is pressed, the fixed clamping jaw (38) is opened, and the double-piece conductive sheet (36) is inserted; the clamping jaw switch (313) is released, and the fixed clamping jaw (38) clamps the double-piece conductive sheet (36); the rotating block (32) is turned inward, and the normally closed point gold wire (33) and the normally open point gold wire (34) contact the gold sheets at both ends of the double-piece conductive sheet (36); Step 3-3, testing the electrical contact distance; The moving block (37) moves from the initial position A to the end position B, and the brush (35) contacts and moves with the double-sheet conductive sheet (36); when the brush (35) is separated from the first gold sheet (362) of the double-sheet conductive sheet (36), the distance value of the disconnection point C is recorded, and when the brush (35) just contacts the second gold sheet (364) of the double-sheet conductive sheet (36), the distance value of the connection point D is recorded; The brush (35) is reset to its initial position; Step 3-4, The rotating block (32) is turned outward, so that the ends of the normally closed point gold wire (33) and the normally open point gold wire (34) are out of contact with the double-piece conductive sheet (36); the clamping claw switch (313) is pressed, the fixed clamping claw (38) is opened, and the double-piece conductive sheet (36) is taken out; According to the distance value recorded at the disconnection point C and the distance value recorded at the connection point D, it is judged whether the double-sheet conductive sheet (36) is polished to be qualified; if it is unqualified, the removed double-sheet conductive sheet (36) is re-polished, and steps 3-1 to 3-3 are repeated until the polishing is qualified.