A detection jig for detecting card resistance

Abstract

This utility model discloses a testing fixture for detecting the resistance of a cassette, including a base and a digital push-pull force gauge. A placement seat is mounted on the base, and the placement seat has a test receiving slot. The fixture has a clamping device and a conductive structure. The digital push-pull force gauge is mounted on the base in a manner that allows it to be adjusted and moved towards the conductive structure. The conductive structure has a contact part that extends into the test receiving slot and contacts the laser-engraved surface of the cassette; two outwardly extending resistance testing parts for corresponding contact testing with the two test ends of the resistance tester; and a pressure testing part for contact testing with the test ends of the digital push-pull force gauge. Compared with existing technologies, this method allows the resistance value of the test piece to be measured under the same test pressure, ensuring stable product quality and improving product quality control. Throughout the testing process, no unstable external forces act on the cassette, ensuring accurate resistance values ​​for the cassette.

Description

Technical Field

[0001] This utility model relates to the field of testing technology, and in particular to a testing fixture for testing Cato resistance. Background Technology

[0002] Current mobile phone SIM card trays consist of a base for holding the SIM card and a SIM card cap exposed on the phone's frame. The base lies horizontally, while the SIM card cap is a sheet-like structure that stands upright. One end of the base is connected to one side of the SIM card cap. These trays are typically made of aluminum. During manufacturing, the end of the base facing away from the SIM card cap requires laser engraving, followed by resistance testing of the laser-engraved area. The current method for testing the resistance of aluminum cassettes involves placing the cassette directly on a worktable. The two testing terminals of the resistance tester then measure the resistance against the laser-engraved surface of the cassette (i.e., the end face of the base). During testing, the testing terminals of the resistance tester need to be pressed firmly against the laser-engraved surface. However, the operator holds the testing terminals against the laser-engraved surface, and the operator's strength is inconsistent. This results in varying pressure applied by the testing terminals, leading to different measured resistance values. Consequently, the resistance readings obtained by the resistance tester are inaccurate due to the unstable testing pressure.

[0003] In view of this, the inventors of this case conducted in-depth research on the problem, which led to the creation of this case. Utility Model Content

[0004] The purpose of this invention is to provide a testing fixture for detecting the resistance of card trays, in which the detection pressure is fixed when performing resistance detection on the laser-engraved part of each card tray, thus ensuring the accuracy of the detection.

[0005] To achieve its purpose, this utility model adopts the following technical solution: A testing fixture for detecting the resistance of a card tray includes a base and a digital push-pull force gauge for testing pressure. The base has a placement seat for placing the card tray. The top surface of the placement seat has a recessed test receiving groove for housing the base of the card tray and extending the card tray's cap. The base has a clamping device for holding the card tray's cap and a conductive structure for conductive connection between the card tray and a resistance tester. The conductive structure and clamping device are located on opposite sides of the test receiving groove. The digital push-pull force gauge is mounted on the base in a manner that allows it to be adjusted and translated towards the conductive structure. The conductive structure is located between the test receiving groove and the digital push-pull force gauge, with the testing end of the digital push-pull force gauge facing the conductive structure. The conductive structure has a contact portion that extends into the test receiving groove and contacts the laser-engraved surface of the card tray, two outwardly extending resistance testing portions for corresponding contact testing of the two testing ends of the resistance tester, and a pressure testing portion for contact testing of the testing ends of the digital push-pull force gauge.

[0006] The base is a plate with the translation direction of the digital push-pull force gauge as the left and right direction. A left mounting block is provided on the left side of the base. The clamping device is installed on the left mounting block. The placement seat is locked on the base and located on the right side of the left mounting block. An adjustment plate is locked on the top surface of the base outside the right side of the placement seat. The adjustment plate is installed on the base in a way that allows it to translate left and right. The digital push-pull force gauge is horizontally fixed on the top surface of the adjustment plate, and the detection end of the digital push-pull force gauge is set to the left.

[0007] The aforementioned placement base is a square block, which is locked to the top surface of the base. The top surface of the square block has a recessed square through groove that runs along the translational direction of the digital push-pull force gauge. This square through groove is the test receiving groove.

[0008] The clamping device has a clamping rod, a torsion spring, and a pin. The top surface of the left mounting base has a recessed mounting groove. The clamping rod is vertically arranged, with its lower end extending into the mounting groove. The lower left side wall of the clamping rod has a left groove recessed to the right. The torsion spring lies horizontally in the left groove along the left-right direction. One arm of the torsion spring faces upward and abuts against the inner wall of the left groove, while the other arm extends to the left and abuts against the left inner wall of the mounting groove. The pin lies horizontally along the front-back direction and connects the torsion spring, the clamping rod, and the left mounting base together. The upper right side wall of the clamping rod has a clamping block protruding to the right. The right side of the clamping block has a clamping groove that extends through the front-back direction and allows the clasp of the clasp to be tightly inserted.

[0009] The aforementioned adjusting plate is fastened to the aforementioned base by bolts. Bolt holes for bolts to be screwed into are respectively opened on the left and right sides of the top surface of the aforementioned base. The aforementioned adjusting plate has a strip-shaped hole that runs vertically through the bolt holes and extends in the left and right directions, and the head of the aforementioned bolt is located in the strip-shaped hole. A placement boss for stacking bolt heads is provided in the strip-shaped hole.

[0010] The aforementioned guide structure includes a mounting base and conductive sheets. The mounting base is vertically mounted on the top surface of the base and fits against the right side of the placement base. The mounting base has a through hole running horizontally through it. Two conductive sheets are provided, arranged back-to-back with a gap between them. The first end of the conductive sheet is located inside the through hole and extends into the mounting groove, while the second end of the conductive sheet extends outward beyond the mounting base. The second ends of the two conductive sheets extend back to back. A pressure transmission block is provided on the right side of the mounting base, which is fixed together with the second ends of the two conductive sheets. The first end of the conductive sheet is the contact part, the second end of the conductive sheet is the resistance testing part, and the pressure transmission block is the pressure testing part.

[0011] The aforementioned conductive sheet has a first horizontal portion and a second horizontal portion. The first horizontal portion is located inside the through hole and extends in the left-right direction. The second horizontal portion is perpendicular to the right end of the first horizontal portion and extends in the front-back direction. The first horizontal portions of the two conductive sheets are spaced apart. The left end face of the first horizontal portion is provided with a protrusion that contacts the laser-engraved surface of the card holder. The second horizontal portions of the two conductive sheets extend in opposite directions and protrude out of the mounting base. The right side of the mounting base is provided with a placement notch corresponding to the front and back sides of the through hole, with one end connected to the through hole and the other end leading to the outside of the side of the mounting base. The two placement notches lead to the outside of the top surface of the mounting base. The top surface of the mounting base is locked with a stacking block on the left side stacked on the mounting base and the right side extending out of the mounting base. The stacking block is stacked on the conductive sheet.

[0012] The pressure transmission block is a strip-shaped block extending in the front-back direction. The right side of the mounting base is recessed with a receiving groove, and the pressure transmission block is located in the receiving groove. The through hole and a portion of the two second horizontal parts fall within the receiving groove. The right side wall of the mounting base is provided with a positioning post that is horizontally arranged in the left-right direction. The second horizontal parts and the pressure transmission block are both fitted onto the positioning post.

[0013] With the above technical solution, the present invention provides a testing fixture for detecting the resistance of card trays. In application, the card tray to be tested is placed in the test receiving slot of the placement base, with the card cap outside the test receiving slot. A clamping device is used to clamp and fix the card cap, thus fixing the card tray within the test receiving slot. The contact portion on the conductive structure contacts the laser-engraved surface of the card tray, and the test end of the digital push-pull force gauge contacts the pressure testing part, completing the card tray placement for testing. Finally, the two test ends of the resistance tester are clamped onto the two resistance testing parts respectively, allowing the resistance value at the laser-engraved surface of the card tray to be measured. Compared with existing technologies, the entire testing process involves no unstable external force acting on the card tray, ensuring accurate resistance measurements. Furthermore, the translational adjustment of the digital push-pull force gauge allows for the determination of the test pressure required for the card tray's resistance to be within the standard resistance range, ensuring that each card tray is tested under the same test pressure, guaranteeing stable product quality and improving product quality control. Additionally, the entire structure is simple and easy to operate. Attached Figure Description

[0014] Figure 1 This is a perspective view of the present utility model; Figure 2 This is a partial structural schematic diagram of the present invention; Figure 3 This is a schematic diagram of the placement base and conductive structure in this utility model. Detailed Implementation

[0015] To further explain the technical solution of this utility model, a detailed description is provided below in conjunction with the accompanying drawings.

[0016] This utility model provides a testing fixture for detecting Cato resistance, such as... Figure 1-3 As shown, the device includes a base 1 and a digital push-pull force gauge 100 for testing pressure. This digital push-pull force gauge 100 is an existing product and not a product developed in this invention. The base 1 is equipped with a placement seat 2 for placing a card holder 200. The top surface of the placement seat 2 is recessed with a test receiving groove 21 for housing the base 201 of the card holder 200 and for extending the card cap 202 of the card holder 200. Specifically, the base 1 is a square plate, and the placement seat 2 is a square block. The square block stands upright on the left side of the top surface of the base 1 and is locked together by bolts extending from the bottom surface of the base 1. The top surface of the square block is recessed with a square through groove running from left to right. The width of the square through groove is the same as the width of the base 201 of the card holder 200. This square through groove is the test receiving groove 21. When placed, the base 201 of the card holder 200 is placed flat in the square through slot, and the card cap 202 of the card holder 200 extends out to the left side of the square through slot.

[0017] The base 1 is provided with a clamping device 3 for clamping the card cap 202 of the card tray 200 and a conductive structure for conductive connection between the card tray and the resistance tester. The conductive structure and the clamping device are located on opposite sides of the test receiving groove. Specifically, the clamping device is located on the left side of the test receiving groove. The clamping device 3 includes a clamping rod 31, a torsion spring 32, and a pin 33. A left mounting block 11 protrudes to the left on the left side wall of the base 1. The left mounting block 11 is a square block, and its top surface is flush with the base 1. A square mounting groove 111 is recessed in the center of the top surface. The clamping rod 31 is a strip-shaped block and is erected. A clamping block 311 protrudes to the right from the upper right side wall of the clamping rod 31. A clamping groove 311a is recessed to the left from the right side of the clamping block 311, which extends through the front-to-back direction and allows the cap 202 of the card holder 200 to be tightly inserted. The opening of the clamping groove 311a faces the test receiving groove 21 and is aligned with the test receiving groove 21. The lower end of the clamping rod 31 extends into the mounting groove 111, with the lower end of the clamping rod 31 extending to the right from the left. A left recess 312 is provided, and the torsion spring 32 lies horizontally within the left recess 312 in a left-right direction. The torsion spring 32 has a first arm and a second arm. The first arm of the torsion spring 32 is located above the torsion spring and extends upward at an angle, while the second arm of the torsion spring 32 is located below the torsion spring and extends upward at an angle. The first and second arms of the torsion spring 32 are on the same side and have the same direction of inclination. The upper inner wall of the left recess 312 is an inclined wall that slopes downward from left to right. The first arm of the torsion spring 32 abuts against the inclined wall, and the second arm of the torsion spring 32 extends to the left of the left recess. The pin 33 is horizontally arranged along the front-back direction and connects the torsion spring 32, the clamping rod 31 and the left mounting block 11 together. The front and rear side walls of the left mounting block 11 are provided with through holes that communicate with the left groove 312. The lower end of the clamping rod 31 is also provided with a through hole for the pin 33 to pass through. The pin 33 passes through the through hole, the left mounting hole and the clamping rod. The torsion spring 32 is fitted on the outside of the pin 33, and the two ends of the pin 33 are provided with limiting plates 331 to limit the left and right translation of the pin 33. When installing the clamping device, first insert the lower end of the clamping rod 31 into the mounting groove 111, place the torsion spring 32 flat in the left groove 312, with the first arm of the torsion spring 32 abutting against the upper inner groove wall of the left groove 312, and the second arm extending out of the left groove 312 and abutting against the left inner groove wall of the mounting groove 111. Insert the pin into the left mounting block 11 from front to back or from back to front, and pass through the clamping rod and the torsion spring, connecting the torsion spring 32, the clamping rod 31 and the left mounting block 11 together.When placing the card tray 200, tilt the clamping rod 31 to the left with one hand, press the first arm of the torsion spring 32 upward, and move the clamping block 311 of the clamping rod away from the test receiving groove 21. Place the card tray flat in the test receiving groove 21 with the other hand. After placement, release the hand, and the torsion spring 32 will reset. The reset of the torsion spring will drive the clamping rod 31 to reset to the right and stand upright. At the same time as the clamping rod resets, the card cap of the card tray will just be inserted into the clamping groove 311a, thus achieving the clamping of the card tray. In this invention, in order to increase the swing space of the clamping rod, a square opening is provided on the bottom of the mounting groove 111 for the lower end of the clamping rod 31 to extend into and accommodate it. The top surface of the left mounting block is recessed at the left groove wall of the mounting groove, and a left notch is provided that leads to the left side of the left mounting block and is connected to the mounting groove. The second arm of the torsion spring 32 abuts against the bottom of the left notch and extends to the left. The square opening allows the lower end of the clamping rod and the lower part of the torsion spring to be accommodated when the clamping rod and the torsion spring are installed, saving installation space. The left notch also allows the clamping rod to swing to the left with more space.

[0018] The conductive structure is located on the right side of the test receiving groove 21. The conductive structure has a contact part that can extend into the test receiving groove 21 and contact the laser-engraved surface of the card holder 200. Two outwardly extending resistance testing parts are provided for the two test ends of the resistance tester to contact and test. Specifically, the conductive structure includes a mounting base 4 and conductive sheets 5. The mounting base 4 is vertically mounted on the top surface of the base 1 and fits against the right side of the placement seat 2 and is locked together by bolts 300. The mounting base 4 has a through hole 41 that runs from left to right. Two conductive sheets 5 are provided, which are arranged back to back with a gap. The first end of the conductive sheet 5 is in the through hole 41 and extends into the mounting groove 21. The second end of the conductive sheet 5 extends outward from the mounting base 4. The second ends of the two conductive sheets 5 extend back to back. The right side of the mounting base 4 is provided with a pressure transmission block 6 that is fixed together with the second ends of the two conductive sheets. The first end of the conductive sheet 5 is the contact part, the second end of the conductive sheet 5 is the resistance testing part, and the pressure transmission block 6 is the pressure testing part.

[0019] Preferably, the conductive sheet 5 has a first horizontal portion 51 and a second horizontal portion 52. The first horizontal portion 51 is located inside the through hole 41 and extends vertically in the left-right direction. The first horizontal portions 51 of the two conductive sheets are spaced apart. The left end face of the first horizontal portion 51 extends out of the through hole 41, and the left end face of the first horizontal portion 51 is provided with a protrusion 511 that contacts the laser-engraved surface of the card holder 200. One or more protrusions 511 can be provided, and multiple protrusions 511 are arranged at intervals from top to bottom. The second horizontal portion is located outside the right side of the first horizontal portion and extends vertically in the front-back direction. The first end of the second horizontal portion 52 is perpendicular to the right end of the first horizontal portion, and the second end of the second horizontal portion 52 extends away from the direction of the first horizontal portion. That is, the second horizontal portions 52 of the two conductive sheets 5 extend away from each other and extend out of the left mounting base 4. The first horizontal portion 51 is the conductive sheet 5 The first end and the end of the second horizontal part are the second ends of the conductive sheet. The mounting base 4 is provided with a placement notch 401 on the front and rear sides corresponding to the through hole 41. One end of the notch is connected to the through hole 41 and the other end is connected to the outside of the side of the mounting base 4. The two placement notches 401 are connected to the outside of the top surface of the mounting base 4. The front end of the placement notch on the front side is connected to the outside of the front side of the mounting base 4 and the rear end is connected to the through hole 41. The front end of the placement notch on the rear side is connected to the through hole 41 and the rear end is connected to the outside of the rear side of the mounting base 4. The top surface of the mounting base 4 is locked with a stacking block 7 on the left side stacked on the mounting base and the right side extending out of the mounting base. The stacking block 7 is a strip-shaped block extending in the front and rear direction. The stacking block 7 is locked on the mounting base 4 by bolts. The installation of the conductive sheet is facilitated by the cooperation between the stacking block 7 and the placement notch.

[0020] The pressure transmission block 6 is a strip-shaped block extending in the front-back direction. The right side of the mounting base 4 is recessed with a receiving groove 402. The through hole 41 and a portion of the two second horizontal parts 52 are within the receiving groove. That is, the rear part of the front second horizontal part 52 and the front part of the rear second horizontal part 52 are both within the receiving groove 402. The pressure transmission block 6 is located in the receiving groove 402. The mounting base 4 is provided with a positioning post 421 extending to the right. The second horizontal part 52 and the pressure transmission block 5 are both fitted onto the positioning post 421. That is, the positioning post 421 is provided at the bottom of the groove where the notched groove is placed. The second horizontal part and the pressure transmission block 6 are both provided with through holes for the positioning post 421 to pass through tightly. The positioning post 421 is used to make the conductive sheet 5 and the pressure transmission block 6 fit tightly together.

[0021] The digital push-pull force gauge 100 is mounted on the base 1 in a manner that allows for left-right translational adjustment, and the conductive structure is located between the test receiving slot 21 and the digital push-pull force gauge 100. Specifically, the top surface of the base 1 is locked with an adjustment plate 12 located outside the right side of the placement seat. The adjustment plate 12 is mounted on the base in a manner that allows for left-right translation. The digital push-pull force gauge 100 is horizontally fixed on the top surface of the adjustment plate 12, and the detection end 101 of the digital push-pull force gauge 100 is set to the left and abuts against the right side of the pressure transmission block 7. That is, the adjustment plate 12 is locked to the base 1 by bolts 500, and the top surface of the base 1... Bolt holes (not shown in the figure) are provided on the left and right sides for bolts 500 to be screwed on. The adjusting plate 12 has a strip hole 121 that runs vertically through the bolt holes and extends horizontally. The head of the adjusting bolt 500 is located in the strip hole 121. The strip hole 121 has a placement boss 121a for stacking the head of the adjusting bolt. When the digital push-pull force gauge 100 needs to be moved, the bolt 500 is loosened and the adjusting plate 12 can move left and right. Because of the setting of the strip hole 121, the bolt 500 does not restrict the left and right translation of the adjusting plate 12. After adjustment, the adjusting plate can be fixed by tightening the bolt 500.

[0022] This utility model discloses a testing fixture for detecting the resistance of a card tray. Initially, the clamping rod 31 is tilted to the left, and then the standard card tray is placed on the test receiving groove 21. The protrusion 511 of the conductive sheet contacts the laser-engraved surface of the standard card tray. Then, the clamping rod 31 is released, and the card tray's cap is just inserted into the clamping groove 311a of the clamping rod 31. The card tray is clamped between the protrusion 511 and the clamping rod 31. The force exerted by the clamping rod 31 on the card tray is transmitted to the detection end 101 of the digital push-pull force gauge 100 through the pressure transmission block 6. The detection end 101 of the digital push-pull force gauge 100 obtains the pressure value. At the same time, the two detection ends of the resistance tester are correspondingly clamped on the free ends of the two second horizontal parts 52. At this time, the pressing force of the digital push-pull force gauge 100 on the pressure transmission block 6 can be adjusted to obtain the resistance tester. Under what pressure is the measured resistance value within the standard range? Finally, the standard part is removed, the digital push-pull force gauge 100 remains stationary, and the test piece is placed on the test receiving slot 21. The resistance tester measures the resistance value of the test piece. In this way, the pressure value on the digital push-pull force gauge is fixed for each test, and the resistance value is measured under the same test pressure, ensuring the stability of product quality and improving product quality control. No unstable external force acts on the card holder during the entire testing process, so that the resistance test of the card holder can obtain an accurate value. In addition, the whole structure is simple, easy to operate, and convenient to replace the conductive sheet. The positional relationship of the conductive sheet, pressure transmission block and digital push-pull force gauge can be appropriately adjusted according to the size of the test piece, making it highly adaptable and flexible in use.

[0023] In this invention, the mounting base 4 has a left mounting base 4a and a right mounting base 4b. Both the left mounting base 4a and the right mounting base 4b are square blocks and are vertically mounted on the top surface of the base 1. The left mounting base 4a is fitted against the right side of the placement base 2, and the left side of the right mounting base 4b is fitted against the right side of the left mounting base 4a. The left and right mounting bases are fastened together by bolts. The top surface of the left mounting base has a recessed through hole running in the left-right direction, which is the through hole 41. The right side of the left mounting base has a recessed placement notch. The positioning post 421 is fixed to the right side wall of the left mounting base 4a. The top surface of the right mounting block 4b has a recessed square through hole running in the left-right direction. The through slot, this square through slot is the aforementioned receiving slot; the setting of the left mounting base and the right mounting base facilitates the installation of the conductive sheet on the positioning post 421; furthermore, the placement base 2 is provided with a positioning post 22, the right side of the placement base 2 facing left is recessed with a right receiving slot (not shown in the figure), the left mounting base 4a is correspondingly provided with a positioning hole that passes through from left to right (not shown in the figure), the left side of the right mounting base 4b is recessed with a left receiving slot (not shown in the figure), the left end of the positioning post 22 is fitted into the right receiving slot, and the right end passes through the positioning hole into the left receiving slot; in this way, the positioning post 22 can guide the installation of the placement base and the mounting base, reducing assembly errors.

[0024] In this invention, the placement seat 2 is provided with a strip-shaped hole 23 for the bolt 300 to pass through and extending in the vertical direction. The installation height of the placement seat 2 can be adjusted within a small range using this strip-shaped hole 23. In this way, the placement seat 2 can be appropriately adjusted according to the size of the clip, so that the clip cap of the clip can always be engaged in the clamping groove 312a of the clamp rod when the clamp rod is rotated.

[0025] The product form of this utility model is not limited to the illustrations and embodiments in this case. Any appropriate changes or modifications made to it based on similar ideas should be considered as not departing from the patent scope of this utility model.

Claims

1. A testing fixture for detecting Cato resistance, characterized in that: The device includes a base and a digital push-pull force gauge for testing pressure. The base has a placement seat for placing a card tray. The top surface of the placement seat has a recessed test receiving groove for housing the base of the card tray and extending the card tray's cap. The base has a clamping device for holding the card tray's cap and a conductive structure for conductive connection between the card tray and a resistance tester. The conductive structure and clamping device are located on opposite sides of the test receiving groove. The digital push-pull force gauge is mounted on the base in a way that allows it to be adjusted and translated towards the conductive structure. The conductive structure is located between the test receiving groove and the digital push-pull force gauge. The detection end of the digital push-pull force gauge faces the guide structure. The conductive structure has a contact portion that extends into the test receiving groove and contacts the laser-engraved surface of the card tray, two outwardly extending resistance testing portions for corresponding contact testing of the two test ends of the resistance tester, and a pressure testing portion for contact testing of the test ends of the digital push-pull force gauge.

2. The detection tool for detecting card resistor according to claim 1, wherein: The base is a plate with the translation direction of the digital push-pull force gauge as the left and right direction. A left mounting block is provided on the left side of the base. The clamping device is installed on the left mounting block. The placement seat is locked on the base and located on the right side of the left mounting block. An adjustment plate is locked on the top surface of the base outside the right side of the placement seat. The adjustment plate is installed on the base in a way that allows it to translate left and right. The digital push-pull force gauge is horizontally fixed on the top surface of the adjustment plate, and the detection end of the digital push-pull force gauge is set to the left.

3. A testing fixture for detecting Cato resistance according to claim 1 or 2, characterized in that: The aforementioned placement base is a square block, which is locked to the top surface of the base. The top surface of the square block has a recessed square through groove that runs along the translational direction of the digital push-pull force gauge. This square through groove is the test receiving groove.

4. A testing fixture for detecting Cato resistance according to claim 2, characterized in that: The clamping device has a clamping rod, a torsion spring, and a pin. The top surface of the left mounting base has a recessed mounting groove. The clamping rod is vertically arranged, with its lower end extending into the mounting groove. The lower left side wall of the clamping rod has a left groove recessed to the right. The torsion spring lies horizontally in the left groove along the left-right direction. One arm of the torsion spring faces upward and abuts against the inner wall of the left groove, while the other arm extends to the left and abuts against the left inner wall of the mounting groove. The pin lies horizontally along the front-back direction and connects the torsion spring, the clamping rod, and the left mounting base together. The upper right side wall of the clamping rod has a clamping block protruding to the right. The right side of the clamping block has a clamping groove that extends through the front-back direction and allows the clasp of the clasp to be tightly inserted.

5. The detection tool for detecting card resistor resistance according to claim 2, wherein: The aforementioned adjusting plate is fastened to the aforementioned base by bolts. Bolt holes for bolts to be screwed into are respectively opened on the left and right sides of the top surface of the aforementioned base. The aforementioned adjusting plate has a strip-shaped hole that runs vertically through the bolt holes and extends in the left and right directions, and the head of the aforementioned bolt is located in the strip-shaped hole. A placement boss for stacking bolt heads is provided in the strip-shaped hole.

6. A testing fixture for detecting Cato resistance according to claim 2, characterized in that: The aforementioned guide structure includes a mounting base and conductive sheets. The mounting base is vertically mounted on the top surface of the base and fits against the right side of the placement base. The mounting base has a through hole running horizontally through it. Two conductive sheets are provided, arranged back-to-back with a gap between them. The first end of the conductive sheet is located inside the through hole and extends into the mounting groove, while the second end of the conductive sheet extends outward beyond the mounting base. The second ends of the two conductive sheets extend back to back. A pressure transmission block is provided on the right side of the mounting base, which is fixed together with the second ends of the two conductive sheets. The first end of the conductive sheet is the contact part, the second end of the conductive sheet is the resistance testing part, and the pressure transmission block is the pressure testing part.

7. A testing fixture for detecting Cato resistance according to claim 6, characterized in that: The aforementioned conductive sheet has a first horizontal portion and a second horizontal portion. The first horizontal portion is located inside the through hole and extends in the left-right direction. The second horizontal portion is perpendicular to the right end of the first horizontal portion and extends in the front-back direction. The first horizontal portions of the two conductive sheets are spaced apart. The left end face of the first horizontal portion is provided with a protrusion that contacts the laser-engraved surface of the card holder. The second horizontal portions of the two conductive sheets extend in opposite directions and protrude out of the mounting base. The right side of the mounting base is provided with a placement notch corresponding to the front and back sides of the through hole, with one end connected to the through hole and the other end leading to the outside of the side of the mounting base. The two placement notches lead to the outside of the top surface of the mounting base. The top surface of the mounting base is locked with a stacking block on the left side stacked on the mounting base and the right side extending out of the mounting base. The stacking block is stacked on the conductive sheet.

8. A testing fixture for detecting Cato resistance according to claim 7, characterized in that: The pressure transmission block is a strip-shaped block extending in the front-back direction. The right side of the mounting base is recessed with a receiving groove, and the pressure transmission block is located in the receiving groove. The through hole and a portion of the two second horizontal parts fall within the receiving groove. The right side wall of the mounting base is provided with a positioning post that is horizontally arranged in the left-right direction. The second horizontal parts and the pressure transmission block are both fitted onto the positioning post.

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