Positioning fixture for welding wires of resistance strain gauges

Abstract

This utility model relates to the field of positioning fixtures for welding, and discloses a positioning fixture for welding wires of resistance strain gauges. It includes a base, a through groove on the outer wall of the base, a support shaft rotatably connected to the inner wall of the through groove, an adjusting disc fixedly connected to the top of the support shaft, a driven gear fixedly connected to the outer wall of the support shaft, a rotating shaft rotatably connected to the inner wall of the through groove, a driving gear fixedly connected to the outer wall of the rotating shaft, a dial fixedly connected to the outer wall of the rotating shaft, a rectangular groove on the top of the dial, and a fixing plate fixedly connected to the outer wall of the base. In this utility model, the angle of the support shaft is adjusted by gear transmission and magnetically locked. A telescopic spring drives a rubber pad to fix the strain gauge, and a magnetic frame and a return spring drive a silicone ball to position the wire. The overall operation is convenient, and it can flexibly adapt to strain gauges of different sizes, improving the positioning accuracy and stability during welding.

Description

Technical Field

[0001] This utility model relates to the field of positioning fixtures for welding, and in particular to a positioning fixture for welding wires of resistance strain gauges. Background Technology

[0002] Soldering the leads of a resistance strain gauge is the process of forming a low-resistance, highly reliable, and fatigue-resistant connection between the strain gauge leads and the measuring cable through soldering, fusion welding, or crimping. It requires small solder joints, minimal heat-affected zones, and no incomplete soldering. Low-temperature solder wire and precision constant-temperature soldering iron are commonly used. After soldering, the cable is cleaned and an insulating sheath is added to ensure long-term stable transmission of microvolt-level signals.

[0003] The use of positioning fixtures for welding the wires of resistance strain gauges is to ensure that the relative positions of the weld points, the wire routing, and the sensitive grid of the strain gauge are maintained in a precise and repeatable manner, preventing stress concentration, incomplete welding, or wire breakage caused by manual shaking or thermal deformation.

[0004] In existing technologies, although there are jigs that use magnetic force for positioning or locking, the magnetic components are usually directly exposed and are easily contaminated by solder sputtering or fail due to external impact during the welding process. In addition, the base of the adsorption jig is mostly made of magnetically conductive materials, such as steel, which, although magnetically strong, is heavy, easily corroded, and can affect the magnetism of precision components. Finally, there is a lack of a modular structure that can integrate angle adjustment, planar positioning, wire clamping, and rapid operation. Therefore, a positioning jig for welding wires of resistance strain gauges is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a positioning fixture for welding wires of resistance strain gauges, which aims to improve the problem of reduced welding effect caused by the difficulty in adapting to welding strain gauges of different sizes in the prior art.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a positioning fixture for welding the wires of a resistance strain gauge, comprising a base, a through groove on the outer wall of the base, a support shaft rotatably connected to the inner wall of the through groove, an adjusting disc fixedly connected to the top of the support shaft, a driven gear fixedly connected to the outer wall of the support shaft, a rotating shaft rotatably connected to the inner wall of the through groove, a driving gear fixedly connected to the outer wall of the rotating shaft, a dial fixedly connected to the outer wall of the rotating shaft, a rectangular groove on the top of the dial, a fixing plate fixedly connected to the outer wall of the base, and a rectangular hole penetrating through the outer wall of the fixing plate. The device contains a magnetic block. A T-shaped slide rail is mounted on the top of the adjustment disc. A movable seat is slidably connected to the outer wall of the T-shaped slide rail. A screw hole is opened on the top of the T-shaped slide rail, and a bolt is threaded onto the inner wall of the screw hole. A limit plate is fixedly connected to the outer wall of the movable seat. A fixing rod is slidably connected to the inner wall of the limit plate. A lifting block is fixedly connected to the top of the fixing rod, and a pressure block is fixedly connected to the bottom of the fixing rod. A rubber pad is fixedly connected to the bottom of the pressure block, and a telescopic spring is fixedly connected to the top of the pressure block. An adjustment auxiliary assembly and a wire positioning assembly are provided on the outer wall of the adjustment disc.

[0007] As a further description of the above technical solution:

[0008] The outer wall of the magnetic block is adapted to the inner wall of the rectangular hole, the outer wall of the magnetic block is magnetically connected to the inner wall of the rectangular groove, and the driven gear meshes with the driving gear.

[0009] As a further description of the above technical solution:

[0010] The bolt passes through the movable seat and is threaded to the inner wall of the movable seat. The fixed rod passes through the limiting plate. The telescopic spring is sleeved on the outer wall of the fixed rod. The top end of the telescopic spring is fixedly connected to the bottom of the limiting plate.

[0011] As a further description of the above technical solution:

[0012] The lifting block is positioned with one end near the movable seat tilted upwards.

[0013] As a further description of the above technical solution:

[0014] The adjustment auxiliary component includes a connecting plate, a magnetic rod slidably connected to the inner wall of the connecting plate, a positioning hole on the top of the adjustment disk, an installation cavity on the inner wall of the adjustment disk, and a magnetic disk fixedly connected to the inner wall of the installation cavity.

[0015] As a further description of the above technical solution:

[0016] The outer wall of the connecting plate is fixedly connected to the outer wall of the T-shaped slide rail. The magnetic rod passes through the connecting plate, and the outer wall of the magnetic rod is magnetically connected to the inner wall of the positioning hole through a magnetic disk.

[0017] As a further description of the above technical solution:

[0018] The wire positioning assembly includes a magnetic frame, a movable rod slidably connected to the inner wall of the magnetic frame, a mounting block fixedly connected to the bottom end of the movable rod, a silicone ball fixedly connected to the bottom of the mounting block, a return spring fixedly connected to the top of the mounting block, and an arc-shaped groove formed at the bottom of the silicone ball.

[0019] As a further description of the above technical solution:

[0020] The outer wall of the magnetic frame is magnetically connected to the top of the adjustment plate via a magnetic disk, the top of the reset spring is fixedly connected to the inner surface of the magnetic frame, and the moving rod passes through the magnetic frame.

[0021] As a further description of the above technical solution:

[0022] A shielding frame is fixedly connected to the top of the movable seat, and a rubber block is fixedly connected to the inner wall of the shielding frame. An inclined surface is provided at the bottom of the rubber block.

[0023] As a further description of the above technical solution:

[0024] The outer wall of the rubber block engages with the end of the lifting block furthest from the fixed rod.

[0025] This utility model has the following beneficial effects:

[0026] 1. In this utility model, the angle of the support shaft is adjusted by gear transmission and locked by magnetic force. The position of the moving seat is adjusted by T-shaped guide rail and bolts. The strain gauge is fixed by rubber pad driven by telescopic spring. The magnetic frame and reset spring drive silicone ball to position the wire. The overall operation is convenient and can be flexibly adapted to strain gauges of different sizes, improving the positioning accuracy and stability during welding and improving welding efficiency.

[0027] 2. In this utility model, the meshing structure of the shielding frame and the rubber block with the inclined surface reduces the upward resistance of the lifting block and increases the downward resistance, allowing the operator to easily lift the pressure block to remove the strain gauge. At the same time, it ensures self-locking and anti-loosening during pressing, which improves the operating efficiency and comfort, ensures the pressing stability of the workpiece, and improves the safety and convenience of welding positioning. Attached Figure Description

[0028] Figure 1 This is a side view of the main structure of the positioning fixture for welding the wires of the resistance strain gauge proposed in this utility model.

[0029] Figure 2 An exploded view of the main structure of the positioning fixture for welding the wires of the resistance strain gauge proposed in this utility model;

[0030] Figure 3 This is a partial cross-sectional view of the positioning fixture for welding the wires of the resistance strain gauge proposed in this utility model.

[0031] Figure 4 This is a top view of a partial structure of the positioning fixture for welding the wires of the resistance strain gauge proposed in this utility model.

[0032] Figure 5 This is a bottom view schematic diagram of the T-shaped slide rail structure of the positioning fixture for welding the wires of the resistance strain gauge proposed in this utility model.

[0033] Legend:

[0034] 1. Base; 2. Through slot; 3. Support shaft; 4. Adjusting disc; 5. Driven gear; 6. Driven gear; 7. Rotating shaft; 8. Dial; 9. Rectangular slot; 10. Magnetic block; 11. Fixing plate; 12. Rectangular hole; 13. T-shaped slide rail; 14. Moving seat; 15. Screw hole; 16. Bolt; 17. Limiting plate; 18. Lifting block; 19. Fixing rod; 20. Pressure block; 21. Rubber pad; 22. Mounting cavity; 23. Magnetic disk; 24. Magnetic frame; 25. Moving rod; 26. Return spring; 27. Mounting block; 28. Silicone ball; 29. ​​Arc groove; 30. Connecting plate; 31. Magnetic rod; 32. Positioning hole; 33. Covering frame; 34. Rubber block; 35. Inclined surface; 36. Telescopic spring. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] Reference Figures 1-3This utility model provides an embodiment of a positioning fixture for welding wires of a resistance strain gauge, comprising a base 1, a through groove 2 on the outer wall of the base 1, a support shaft 3 rotatably connected to the inner wall of the through groove 2, and an adjusting disc 4 fixedly connected to the top of the support shaft 3. Both the base 1 and the adjusting disc 4 are made of hard anodized aluminum alloy, possessing lightweight, high strength, and non-magnetic properties, ensuring that the magnetic force of the magnetic disk 23 can effectively penetrate its wall thickness to attract external components. A driven gear 5 is fixedly connected to the outer wall of the support shaft 3. The teeth of the driven gear 5 are hardened and transmit power through meshing with the driving gear 6, improving the service life of the gear transmission. A rotating shaft 7 is rotatably connected to the inner wall of the through groove 2, and the rotating shaft 7 is parallel to the support shaft 3, capable of driving... The drive gear 6 and dial 8 rotate synchronously to ensure the synchronicity of power transmission. The drive gear 6 is fixedly connected to the outer wall of the rotating shaft 7. The number of teeth of the drive gear 6 is reasonably matched with that of the driven gear 5. When the drive gear 6 rotates, it can efficiently drive the driven gear 5 to rotate, realizing precise speed control of the adjustment disc 4. The driven gear 5 meshes with the drive gear 6. The dial 8 is fixedly connected to the outer wall of the rotating shaft 7. The edge of the dial 8 is provided with anti-slip texture, which makes it convenient for the operator to manually rotate to adjust the adjustment disc 4 and improves the operating feel. A rectangular groove 9 is opened on the top of the dial 8. The inner wall of the rectangular groove 9 is smoothed so that it can fit tightly with the magnetic block 10 to realize the rapid positioning of the dial 8. The dial 8 is made of low carbon steel. Its rectangular groove 9 area can form a low magnetic resistance circuit with the magnetic block 10, thereby... A strong attraction force is generated to achieve reliable locking. A fixing plate 11 is fixedly connected to the outer wall of the base 1. A rectangular hole 12 is opened through the outer wall of the fixing plate 11. The length direction of the rectangular hole 12 is adapted to the rotation trajectory of the dial 8, which guides the movement of the magnetic block 10 and prevents the magnetic block 10 from deviating. The magnetic block 10 is set inside the rectangular hole 12. The outer wall of the magnetic block 10 is adapted to the inner wall of the rectangular hole 12. The adaptation relationship ensures that the magnetic block 10 moves smoothly and does not wobble in the rectangular hole 12, improving the convenience of positioning operation. The outer wall of the magnetic block 10 is magnetically connected to the inner wall of the rectangular groove 9. A T-shaped slide rail 13 is set on the top of the adjustment plate 4. The cross-section of the T-shaped slide rail 13 is "T" shaped, which perfectly fits the groove of the moving base 14, allowing for movement. The seat 14 provides a stable sliding track. Two sets of T-shaped slide rails 13 are provided, one set being fixedly connected to the top of the adjusting plate 4. A movable seat 14 is slidably connected to the outer wall of the T-shaped slide rail 13. Anti-friction pads are installed on the inner wall of the movable seat 14, allowing for smooth adjustment of the position of components such as the limiting plate 17 and reducing sliding friction. A screw hole 15 is provided at the top of the T-shaped slide rail 13, and a bolt 16 is threaded onto the inner wall of the screw hole 15. The bolt 16 passes through the movable seat 14 and is threaded onto the inner wall of the movable seat 14. A limiting plate 17 is fixedly connected to the outer wall of the movable seat 14, and a fixing rod 19 is slidably connected to the inner wall of the limiting plate 17. The surface of the fixing rod 19 is chrome-plated, allowing for smooth up-and-down movement of the pressure block 20 and improving wear resistance. The fixing rod 19 passes through the limiting plate 17.A lifting block 18 is fixedly connected to the top of the fixed rod 19. The end of the lifting block 18 near the movable seat 14 is tilted upwards. A pressure block 20 is fixedly connected to the bottom of the fixed rod 19. A rubber pad 21 is fixedly connected to the bottom of the pressure block 20. A telescopic spring 36 is fixedly connected to the top of the pressure block 20. The telescopic spring 36 is sleeved on the outer wall of the fixed rod 19, and the top of the telescopic spring 36 is fixedly connected to the bottom of the limiting plate 17.

[0037] Reference Figures 3-5 The outer wall of the adjusting disk 4 is provided with an adjusting auxiliary component, which includes a connecting plate 30. The outer wall of the connecting plate 30 is fixedly connected to the outer wall of the T-shaped slide rail 13. A magnetic rod 31 is slidably connected to the inner wall of the connecting plate 30, and the magnetic rod 31 passes through the connecting plate 30. A positioning hole 32 is opened at the top of the adjusting disk 4. The outer wall of the magnetic rod 31 is magnetically connected to the inner wall of the positioning hole 32 through a magnetic disk 23. An installation cavity 22 is opened on the inner wall of the adjusting disk 4. The depth and diameter of the installation cavity 22 match the magnetic disk 23, providing a hidden installation space for the magnetic disk 23 without affecting the installation of other components. The magnetic disk 23 is fixedly connected to the inner wall of the installation cavity 22. Both the magnetic block 10 and the magnetic disk 23 are made of neodymium iron boron permanent magnet material, and the surface is nickel-plated to prevent oxidation and provide stable magnetic force. A wire positioning group is provided on the outer wall of the adjusting disk 4. The component includes a magnetic frame 24, with a magnetic conductive sheet, such as a low-carbon steel sheet, embedded at the bottom of the magnetic frame 24 to allow it to effectively attract the magnetic disk 23. The outer wall of the magnetic frame 24 is magnetically connected to the top of the adjustment disk 4 through the magnetic disk 23. A moving rod 25 is slidably connected to the inner wall of the magnetic frame 24, and the moving rod 25 passes through the magnetic frame 24. A mounting block 27 is fixedly connected to the bottom of the moving rod 25. A silicone ball 28 is fixedly connected to the bottom of the mounting block 27, and a return spring 26 is fixedly connected to the top of the mounting block 27. The return spring 26 can quickly reset and clamp the wire by the elastic force of the silicone ball 28, ensuring stable clamping force. The top of the return spring 26 is fixedly connected to the inner surface of the magnetic frame 24. An arc-shaped groove 29 is opened at the bottom of the silicone ball 28. The radius of the arc-shaped groove 29 is adapted to the diameter of commonly used wires, which can better fit the shape of the wire, significantly improve the fixing effect, and prevent the wire from slipping.

[0038] Reference Figure 5A shielding frame 33 is fixedly connected to the top of the movable seat 14. The shielding frame 33 is made of transparent plastic material, which can protect the lifting block 18 and the rubber block 34 from dust and facilitate observation of the internal fit. The inner wall of the shielding frame 33 is fixedly connected to the rubber block 34. The rubber block 34 has a certain elasticity and wear resistance, and can flexibly cooperate with the lifting block 18 to achieve the smooth rise of the lifting block 18. The bottom of the rubber block 34 has an inclined surface 35. The outer wall of the rubber block 34 meshes with the end of the lifting block 18 away from the fixed rod 19. The contact surfaces of the two are roughened. The meshing ensures the reliability of the two fit and avoids slippage. The lower surface of the far end of the lifting block 18 has continuous serrated protrusions, and the inclined surface 35 of the rubber block 34 has matching serrated grooves. When the lifting block 18 is pressed down, the elastic toothed wall of the rubber block 34 and the rigid toothed wall of the lifting block 18 wed each other tightly, generating a self-locking effect and increasing the downward resistance. When the lifting block 18 is lifted up, the toothed inclined surface generates a component force that causes the rubber block 34 to elastically deform, making it easy to disengage. The upward resistance is less than the downward resistance, realizing the self-locking and anti-loosening in the pressed state and the labor-saving operation in the lifting state.

[0039] Working principle: The base 1 is placed horizontally on the welding table. The operator uses their fingers to move the anti-slip texture on the edge of the dial 8, causing the rotating shaft 7 to drive the drive gear 6 to rotate. Due to the meshing of the drive gear 6 and the driven gear 5, the angle can be adjusted. After the angle is confirmed, the magnetic block 10 is slid down along the rectangular hole 12 of the fixing plate 11, so that it is embedded in the rectangular groove 9 of the dial 8. Since the dial 8 is made of magnetic material, it forms a strong magnetic attraction with the magnetic block 10, thereby completely locking the rotating shaft 7 and preventing it from rotating back. In turn, the angle between the support shaft 3 and the adjusting plate 4 is locked through the gear pair. Subsequently, the angle is adjusted according to the strain of the resistance to be welded. The size of the strain gauge is determined, and the magnetic rod 31 slides along the connecting plate 30 into the corresponding positioning hole 32 and attracts the magnetic disk 23. The spacing of the two sets of T-shaped slide rails 13 is adjusted, and then the bolts 16 on the two T-shaped slide rails 13 are loosened. The moving seat 14 can then slide smoothly along the T-shaped slide rails 13, driving the limiting plate 17, pressure block 20 and other components on it to move to the appropriate position, so that the projection of the pressure block 20 is located on the top of the strain gauge. The bolts 16 are tightened, and the bottom of the bolts 16 presses against the high-strength copper alloy insert at the bottom of the screw hole 15, generating huge friction force to firmly lock the moving seat 14. The lifting block 18 is then pulled upward. Because of the toothed meshing structure between its distal raised portion and the rubber block 34, only a small force is needed to overcome the meshing resistance and the elastic force of the telescopic spring 36, causing the fixing rod 19 and the pressure block 20 to rise. After the resistance strain gauge is accurately placed on the positioning mark in the center of the adjustment plate 4, the lifting block 18 is slowly released. Under the pressure of the telescopic spring 36, the pressure block 20 moves down, and the rubber pad 21 at its bottom evenly presses the area outside the solder pad on the edge of the strain gauge, providing sufficient fixing force while avoiding damage to the sensitive strain gauge wire. When positioning the wire, the magnetic frame 24 is placed at the position where the wire needs to be pressed, and the bottom of the guide... The magnetic sheet is instantly attracted and positioned by the magnetic disk 23 hidden inside the adjustment disk 4. Lift the moving rod 25 upward and place the wire into the arc-shaped groove 29 of the silicone ball 28. Release the moving rod 25, and the return spring 26 pushes the mounting block 27 and the silicone ball 28 downward. The elastic deformation of the silicone wraps around and gently presses the wire, completing the rapid positioning of the wire. After welding, first pull the moving rod 25 upward to make the silicone ball 28 detach from the wire and remove the wire. Then pull the lifting block 18 upward. Utilizing the force-saving characteristics of its toothed meshing structure, the pressure block 20 is easily lifted, and the welded strain gauge assembly can be removed.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A positioning jig for wire bonding of a resistance strain gauge, comprising a base (1), characterized in that: The outer wall of the base (1) is provided with a through groove (2), and the inner wall of the through groove (2) is rotatably connected to a support shaft (3). The top of the support shaft (3) is fixedly connected to an adjusting disc (4). The outer wall of the support shaft (3) is fixedly connected to a driven gear (5). The inner wall of the through groove (2) is rotatably connected to a rotating shaft (7). The outer wall of the rotating shaft (7) is fixedly connected to a driving gear (6). The outer wall of the rotating shaft (7) is fixedly connected to a dial (8). The top of the dial (8) is provided with a rectangular groove (9). The outer wall of the base (1) is fixedly connected to a fixing plate (11). The outer wall of the fixing plate (11) is provided with a rectangular hole (12). A magnetic block (10) is provided inside the rectangular hole (12). The top of the adjusting disc (4) is provided with a T-shaped slide rail (1). 3) The outer wall of the T-shaped slide rail (13) is slidably connected to a movable seat (14). The top of the T-shaped slide rail (13) is provided with a screw hole (15). The inner wall of the screw hole (15) is threaded with a bolt (16). The outer wall of the movable seat (14) is fixedly connected to a limiting plate (17). The inner wall of the limiting plate (17) is slidably connected to a fixing rod (19). The top of the fixing rod (19) is fixedly connected to a lifting block (18). The bottom of the fixing rod (19) is fixedly connected to a pressure block (20). The bottom of the pressure block (20) is fixedly connected to a rubber pad (21). The top of the pressure block (20) is fixedly connected to a telescopic spring (36). The outer wall of the adjusting plate (4) is provided with an adjusting auxiliary component. The outer wall of the adjusting plate (4) is provided with a wire positioning component.

2. The positioning fixture for welding the wires of the resistance strain gauge according to claim 1, characterized in that: The outer wall of the magnetic block (10) is adapted to the inner wall of the rectangular hole (12), the outer wall of the magnetic block (10) is magnetically connected to the inner wall of the rectangular groove (9), and the driven gear (5) meshes with the driving gear (6).

3. The positioning fixture for welding the wires of the resistance strain gauge according to claim 1, characterized in that: The bolt (16) passes through the movable seat (14) and is threaded to the inner wall of the movable seat (14). The fixed rod (19) passes through the limiting plate (17). The telescopic spring (36) is sleeved on the outer wall of the fixed rod (19). The top end of the telescopic spring (36) is fixedly connected to the bottom of the limiting plate (17).

4. The positioning fixture for welding the wires of the resistance strain gauge according to claim 1, characterized in that: The lifting block (18) is positioned with its end near the movable seat (14) tilted upwards.

5. The positioning fixture for welding the wires of the resistance strain gauge according to claim 1, characterized in that: The adjustment auxiliary component includes a connecting plate (30), a magnetic rod (31) is slidably connected to the inner wall of the connecting plate (30), a positioning hole (32) is provided on the top of the adjustment disk (4), an installation cavity (22) is provided on the inner wall of the adjustment disk (4), and a magnetic disk (23) is fixedly connected to the inner wall of the installation cavity (22).

6. The positioning fixture for welding the wires of the resistance strain gauge according to claim 5, characterized in that: The outer wall of the connecting plate (30) is fixedly connected to the outer wall of the T-shaped slide rail (13), the magnetic rod (31) passes through the connecting plate (30), and the outer wall of the magnetic rod (31) is magnetically connected to the inner wall of the positioning hole (32) through the magnetic disk (23).

7. The positioning fixture for welding the wires of the resistance strain gauge according to claim 1, characterized in that: The wire positioning assembly includes a magnetic frame (24), a movable rod (25) is slidably connected to the inner wall of the magnetic frame (24), an installation block (27) is fixedly connected to the bottom end of the movable rod (25), a silicone ball (28) is fixedly connected to the bottom of the installation block (27), a return spring (26) is fixedly connected to the top of the installation block (27), and an arc groove (29) is opened at the bottom of the silicone ball (28).

8. The positioning fixture for welding the wires of the resistance strain gauge according to claim 7, characterized in that: The outer wall of the magnetic frame (24) is magnetically connected to the top of the adjustment plate (4) through the magnetic disk (23), the top of the reset spring (26) is fixedly connected to the inner surface of the magnetic frame (24), and the moving rod (25) passes through the magnetic frame (24).

9. The positioning fixture for welding the wires of the resistance strain gauge according to claim 1, characterized in that: The top of the movable seat (14) is fixedly connected to a shielding frame (33), and the inner wall of the shielding frame (33) is fixedly connected to a rubber block (34). The bottom of the rubber block (34) is provided with an inclined surface (35).

10. The positioning fixture for welding the wires of the resistance strain gauge according to claim 9, characterized in that: The outer wall of the rubber block (34) engages with the end of the lifting block (18) away from the fixing rod (19).

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