Projection welding assisted positioning device for ground bolt and nut assembly

Abstract

The projection welding auxiliary positioning device of the grounding bolt and nut assembly comprises a base frame, a limiting part, a gas cylinder, a sliding plate, a supporting positioning part and an upper electrode piece; the base frame is arranged on the ground through a support; the limiting part is arranged on the base frame, and the sliding plate is arranged on the limiting part; the gas cylinder is arranged on the base frame, and the end of the piston rod of the gas cylinder is connected with the sliding plate; the supporting positioning part is arranged on the sliding plate, and a machining piece is arranged on the supporting positioning part, and the machining piece is located between the upper electrode piece and a lower electrode column. The projection welding auxiliary positioning device improves the welding efficiency of the grounding bolt and nut assembly and reduces the labor intensity of workers.

Description

Technical Field

[0001] This utility model relates to an auxiliary positioning device, specifically a device that can assist workers in quickly welding a grounding bolt and nut assembly onto a designated welding position on a product part in front of a projection welding machine, belonging to the technical field of projection welding auxiliary positioning equipment. Background Technology

[0002] In the field of metal structural component manufacturing, especially in the new energy vehicle industry, it is often necessary to weld grounding bolt and nut assemblies onto sheet metal and structural components. Projection welding, due to its numerous advantages, has become one of the main connection processes and is widely used. However, traditional welding of grounding bolt and nut assemblies often employs fixed fixtures or simple positioning tools to position them on designated locations on the sheet metal for arc welding. Current welding technology has the following disadvantages: 1. Low efficiency. When welding grounding bolt and nut assemblies onto each sheet of material, workers must manually and precisely place each bolt and nut assembly onto the predetermined welding position on the fixture. Due to the large number of sheet metals, workers need to repeatedly remove the positioning fixture after welding each sheet. 1. Installing the grounding bolt and nut assembly onto the next sheet metal is an extremely tedious process; 2. It is physically demanding and poses safety hazards, as workers need to manually place the bolts and nuts frequently, increasing their workload; 3. Manual installation of the positioning fixture is prone to errors. Individual differences and fatigue can affect the placement of the positioning fixture, leading to deviations in the position of the subsequent grounding bolt and nut assembly, which in turn affects the product's appearance and subsequent assembly. Therefore, a precise and efficient auxiliary positioning device is needed to help workers efficiently weld each grounding bolt and nut assembly onto the designated weld points on the sheet metal or structural components. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide an auxiliary positioning device for projection welding of grounding bolt and nut assembly. It can not only reduce the labor intensity of workers, but also improve the projection welding accuracy and efficiency of grounding bolt and nut assembly.

[0004] The problem described in this utility model is solved by the following technical solution:

[0005] A projection welding auxiliary positioning device for a grounding bolt and nut assembly includes a base frame, a limiting part, a cylinder, a sliding plate, a supporting positioning part, and an upper electrode component. The base frame is mounted on the ground via a bracket. The limiting part is mounted on the base frame, and the sliding plate is mounted on the limiting part. The cylinder is mounted on the base frame, and the end of its piston rod is connected to the sliding plate. The supporting positioning part is mounted on the sliding plate, and a machined part is mounted on the supporting positioning part, located between the upper electrode component and the lower electrode post.

[0006] The aforementioned projection welding auxiliary positioning device for the grounding bolt and nut assembly has a hole in the center of the base frame, through which the lower electrode rod passes; the lower electrode post is located at the top of the lower electrode rod and is directly above the base frame; the lower electrode rod is held by a lower clamp, which is mounted on a bracket; the upper electrode is located at the bottom of the upper electrode rod and is held by an upper clamp, which is mounted on a lifting mechanism; the upper electrode is located directly above the lower electrode post.

[0007] The above-mentioned projection welding auxiliary positioning device for the grounding bolt and nut assembly has an upper electrode component that is a solid copper column with a stepped inner hole at the center of its bottom end face. The inner diameter of the bottom end of the stepped inner hole is larger than the inner diameter of the top end. The inner diameter of the bottom end of the stepped inner hole of the upper electrode component is larger than the outer diameter of the nut, and the inner diameter of the top end of the stepped inner hole is larger than the outer diameter of the bolt shank of the grounding bolt. The bottom end of the side wall of the upper electrode component has multiple through holes symmetrically arranged around its circumference, and each through hole is equipped with a ball screw. The ball of the ball screw is located at the junction of the through hole and the bottom inner wall of the stepped inner hole. The ball screw includes a spring, a ball, and a housing. The housing is located in the through hole at the bottom end of the side wall of the upper electrode component, and the spring is located inside the housing and presses against the ball.

[0008] The aforementioned projection welding auxiliary positioning device for the grounding bolt and nut assembly includes a limiting part comprising a guiding mechanism and a buffer mechanism; the center line of the first side of the base frame is perpendicular to the center line of the second side of the base frame; the guiding mechanism includes two guide members, both of which are disposed on the top surface of the base frame; the buffer mechanism includes two buffer members, which are disposed at both ends of the top surface of the base frame along the center line direction of the first side of the base frame.

[0009] The above-mentioned auxiliary positioning device for projection welding of the grounding bolt and nut assembly includes a guide rail, a limiting plate, and a slider. The guide rail is set on the top surface of the base frame, and its center line is parallel to the center line of the first side of the base frame. Limiting plates are set at both ends of the guide rail. Two sliders are slidably set on the guide rail. The distance between the two limiting plates is equal to the maximum distance between the two sliders plus the distance between the preset welding points on the workpiece. The sliding plate is set on the top surface of each slider.

[0010] The above-mentioned auxiliary positioning device for projection welding of the grounding bolt and nut assembly includes a buffer component comprising a spring buffer and a pressure block. The spring buffer is disposed at the end of the top surface of the base frame along the centerline of the first side of the base frame, and the pressure block is disposed at the bottom surface of the slide plate. The connecting line between the pressure block and the spring buffer is parallel to the centerline of the first side of the base frame. The spring buffer includes a cylinder, a spring, a slide rod, and a contact. The cylinder is disposed on the top surface of the base frame by a bracket, and its axis is parallel to the centerline of the first side of the base frame. A hole is provided at the end of the cylinder, and the slide rod is inserted into the hole at the end of the cylinder. The end of the spring inside the cylinder is connected to the end of the slide rod through a connecting block, and a contact is provided at one end of the slide rod outside. There are two sliders on each of the two guide rails, and a pressure block is located between two opposing sliders on different guide rails.

[0011] The above-mentioned projection welding auxiliary positioning device for the grounding bolt and nut assembly has a strip-shaped hole on the slide plate, and the length direction of the strip-shaped hole is parallel to the center line of the first side of the base frame; the lower electrode rod passes through the strip-shaped hole of the slide plate; the end of the cylinder piston rod is connected to the slide plate through a bracket; the axis of the cylinder piston rod is parallel to the center line of the first side of the base frame.

[0012] The above-mentioned auxiliary positioning device for projection welding of the grounding bolt and nut assembly includes a support positioning part comprising a support block and a positioning pin; there are multiple support blocks, all of which are set on the top surface of the slide plate, and the top surface of each support block supports the planar area of ​​the bottom surface of the workpiece; the positioning pin is set on the top surface of the slide plate, and the positioning pin passes through the pin hole corresponding to the position on the workpiece; the connecting line between the two preset welding points on the workpiece is parallel to the center line of the first side of the base frame.

[0013] The above-mentioned auxiliary positioning device for projection welding of the grounding bolt and nut assembly is further provided with a positioning block; the positioning block is set on the base frame; the end face of the slide plate near the cylinder is provided with a strip-shaped notch, and the positioning block contacts the inner wall of the strip-shaped notch of the slide plate, and the length of the strip-shaped notch of the slide plate is equal to the distance between two preset welding points on the workpiece.

[0014] This invention uses a cylinder and a limiting part to drive the slide plate to move. The movement of the slide plate also drives the workpiece on it to move synchronously. Each movement moves the two preset welding points of the workpiece precisely between the upper electrode and the lower electrode post. The workpiece is positioned by the support and positioning part to ensure that it moves synchronously with the slide plate. The upper electrode replaces the upper electrode post in the prior art. By setting a stepped hole and a ball screw at the bottom of the upper electrode, the grounding bolt and nut assembly can be quickly installed in the upper electrode, which facilitates subsequent projection welding and greatly improves production efficiency. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention in use.

[0016] Figure 2 This is a partially enlarged structural diagram of utility model A.

[0017] Figure 3 This is a three-dimensional structural diagram of the present invention after the removal of the processed parts;

[0018] Figure 4 This is a three-dimensional structural diagram of the present invention after the skateboard has been removed;

[0019] Figure 5 This is a cross-sectional view of the upper electrode component of this utility model.

[0020] The list of components in the diagram is as follows: 1. Base frame, 2. Cylinder, 3. Slide plate, 4. Upper electrode component, 5. Lower electrode post, 6. Lower electrode rod, 7. Upper electrode rod, 8. Ball screw, 9. Guide rail, 10. Limiting plate, 11. Slider, 12. Buffer component, 13. Contact block, 14. Support block, 15. Positioning pin, 16. Positioning block, 17. Grounding bolt, 18. Nut. Detailed Implementation

[0021] See Figure 1 , 2 3, 4 and Figure 5 This utility model includes a base frame 1, a limiting part, a cylinder 2, a sliding plate 3, a supporting and positioning part, and an upper electrode 4. The base frame 1 is mounted on the ground via a bracket. The limiting part is mounted on the base frame 1, and the sliding plate 3 is mounted on the limiting part. Through the cooperation of the limiting part and the cylinder 2, the sliding plate 3 reciprocates a specified distance, ensuring that each time the sliding plate 3 stops, the welding point on the workpiece is exactly between the upper electrode 4 and the lower electrode post 5. The cylinder 2 is mounted on the base frame 1, and the end of its piston rod is connected to the sliding plate 3. The cylinder is used to drive the sliding plate 3 to slide, and the limiting part ensures that the sliding plate stops at a specified position. The supporting and positioning part is mounted on the sliding plate 3, and the workpiece is mounted on the supporting and positioning part. The supporting and positioning part ensures that the workpiece reliably slides synchronously with the sliding plate 3. The workpiece is located between the upper electrode 4 and the lower electrode post 5. Through the cooperation of the upper electrode 4 and the lower electrode post 5, the grounding bolt and nut assembly is projected onto the preset welding point on the workpiece.

[0022] The base frame 1 has a central hole, through which the lower electrode rod 6 passes. The lower and upper electrode rods are respectively supplied with positive and negative high voltage. The lower electrode post 5 touches the bottom surface of the workpiece. When the grounding bolt and nut assembly inside the upper electrode 4 contacts the workpiece, the grounding bolt and nut assembly is welded to the workpiece under the influence of high voltage. The lower electrode post 5 is located at the top of the lower electrode rod 6, directly above the base frame 1. The lower electrode rod 6 is held by a lower clamp, which is mounted on a support. The upper electrode rod, lower electrode rod, and clamp are also present. All of these are existing conventional technologies. The clamp is only used to clamp the electrode rod. The upper electrode component 4 is set at the bottom end of the upper electrode rod 7, and the upper electrode rod 7 is clamped by the upper clamp. The upper clamp is set on the lifting mechanism. In projection welding, the electrode rod structure is a common structure. The upper electrode rod moving downward under the drive of the lifting mechanism is also a conventional technology. The lifting mechanism driving the upper electrode rod to move is an existing technology in projection welding. The lifting mechanism can be a separate electric cylinder or hydraulic cylinder. The piston rod end drives the upper clamp to move vertically, thereby driving the upper electrode rod to move vertically. The upper electrode component 4 is located directly above the lower electrode post 5.

[0023] The upper electrode 4 is a solid copper pillar with a stepped inner hole at the center of its bottom end face. The inner diameter of the bottom end of the stepped inner hole is larger than the inner diameter of the top end. The stepped inner hole is used to accommodate the grounding bolt and nut assembly. The inner diameter of the bottom end of the stepped inner hole of the upper electrode 4 is larger than the outer diameter of the nut, and the inner diameter of the top end of the stepped inner hole is larger than the outer diameter of the bolt shank of the grounding bolt 17. This ensures that the grounding bolt and nut assembly can smoothly enter the stepped inner hole. The bottom end of the side wall of the upper electrode 4 has multiple through holes symmetrically arranged circumferentially, and each through hole is equipped with a ball screw 8. The ball bearing of the ball screw 8 is located at the junction of the bottom inner wall of the through hole and the inner hole of the step. The ball screw 8 is used to hold the nut, thereby fixing the grounding bolt and nut assembly in the inner hole of the step. The ball screw 8 is a common positioning device. The ball screw 8 pushes the ball bearing with the pressure of the spring, which can perform high-precision positioning of the locking component. The spring holds the ball bearing, and the ball bearing holds the nut to position it. The ball screw 8 includes a spring, a ball bearing, and a housing. The housing is set in the through hole at the bottom of the side wall of the upper electrode component 4. The spring is located inside the housing and holds the ball bearing.

[0024] The limiting part includes a guiding mechanism and a buffering mechanism; the center line of the first side of the base frame 1 is perpendicular to the center line of the second side of the base frame 1; the guiding mechanism includes two guide members, both of which are disposed on the top surface of the base frame 1; the buffering mechanism includes two buffer members 12, which are disposed at both ends of the top surface of the base frame 1 along the center line direction of the first side of the base frame 1.

[0025] The guide component includes a guide rail 9, a limiting plate 10, and a slider 11. The guide rail 9 is disposed on the top surface of the base frame 1, and its center line is parallel to the center line of the first side of the base frame 1. Limiting plates 10 are provided at both ends of the guide rail 9. Two sliders 11 are slidably disposed on the guide rail 9. The function of the limiting plate 10 is to block the sliders 11, ensuring that the sliders 11 stop at the designated position after moving to the guide rail 9, which also ensures that the stop position of the slide is the designated position, and ensures that the preset welding point is located between the electrodes at the upper and lower ends after each slide is in place. The distance between the two limiting plates 10 is equal to the distance between the two sliders 11. The maximum distance between 1 and 1 plus the distance between the preset welding points on the workpiece means that when one slider 11 touches a limiting plate 10, the preset welding point is exactly between the two electrodes. When another slider 11 slides to another limiting plate 10, the second preset welding point is exactly between the two electrodes. In other words, from the state where the first slider 11 touches the limiting plate 10 to the position where the second slider 11 touches the second limiting plate 10, the distance that the slide plate moves is exactly the distance between the two preset welding points. The slide plate 3 is set on the top surface of each slider 11.

[0026] The buffer 12 includes a spring buffer and a pressing block 13. The spring buffer uses the elastic deformation of the spring to absorb impact energy and is a common buffer device. The spring buffer is set at the end of the top surface of the base frame 1 along the center line of the first side of the base frame 1. The pressing block 13 is set at the bottom surface of the slide plate 3, and the connecting line between the pressing block 13 and the spring buffer is parallel to the center line of the first side of the base frame 1. This ensures that the pressing block 13 can smoothly press against the spring buffer when the slide plate slides, so that the slide plate can be buffered by the spring buffer and avoid the sliding block 11 hitting the limiting plate 10 with too much force, which would knock the limiting plate 10 off. The reason for setting the spring buffer and the pressing block 13 is that, in the actual production process, it was found that if the cylinder force is too large, it will knock the limiting plate 10 off and affect the production progress. Therefore, the spring buffer and the pressing block 13 are set to reduce the impact force on the limiting plate.

[0027] The spring buffer includes a cylinder, a spring, a slide rod, and a contact. The cylinder is mounted on the top surface of the base frame 1 via a bracket, and its axis is parallel to the center line of the first side of the base frame 1. The end of the cylinder is provided with a hole, and the slide rod is inserted into the hole at the end of the cylinder. The end of the spring inside the cylinder is connected to the end of the slide rod via a connecting block, and a contact is provided at one end of the slide rod. There are two sliders 11 on each of the two guide rails 9, and there is a pressing block 13 between the two opposing sliders 11 on different guide rails 9. When the two opposing sliders 11 are about to hit the limiting plate, the pressing block 13 hits the contact in advance to buffer the impact.

[0028] The slide plate 3 has a strip-shaped hole, and the length direction of the strip-shaped hole is parallel to the center line of the first side of the base frame 1; the lower electrode rod 6 passes through the strip-shaped hole of the slide plate 3; ensuring that when the slide plate 3 slides, it is not affected by the fixed lower electrode rod 6; the end of the piston rod of the cylinder 2 is connected to the slide plate 3 through a bracket; the axis of the piston rod of the cylinder 2 is parallel to the center line of the first side of the base frame 1; the cylinder can drive the slide plate to move, thereby adjusting the position of the preset welding point on the workpiece, so that it moves precisely between the electrodes.

[0029] The support and positioning part includes support blocks 14 and positioning pins 15; there are multiple support blocks 14, and they are all set on the top surface of the slide plate 3, with the top surface of each support block 14 supporting the planar area of ​​the bottom surface of the workpiece; the positioning pins 15 are set on the top surface of the slide plate 3, and the positioning pins 15 pass through the pin holes corresponding to the positions on the workpiece; the support blocks 14 support the workpiece, and the pins 15 restrict the position of the workpiece to prevent it from horizontally displacing relative to the slide plate; the connecting line between the two preset welding points on the workpiece is parallel to the center line of the first side of the base frame 1, which ensures that the sliding of the slide plate can drive the two preset welding points on the workpiece to the position between the two electrodes.

[0030] A positioning block 16 is added; the positioning block 16 is set on the base frame 1; a strip-shaped notch is provided on the end face of the slide plate 3 near the cylinder 2, and the positioning block 16 contacts the inner wall of the strip-shaped notch of the slide plate 3. The length of the strip-shaped notch of the slide plate 3 is equal to the distance between two preset welding points on the workpiece. The presence of the positioning block 16, in conjunction with the strip-shaped notch, limits the sliding distance of the slide plate to the range of the distance between the two preset welding points. The function of the positioning block 16 is to assist the limiting plate in limiting the slide plate; to limit the end position of the slide plate to the maximum extent, and to ensure that the preset welding points can be accurately moved into place.

[0031] Operating principle: The operation is as follows: The operator places a workpiece on each support block 14, and inserts each positioning pin 15 into the corresponding hole on the workpiece to position it. In the initial state, the cylinder piston rod is in the retracted state, and at this time, the two corresponding sliders 11 on the two guide rails 9 are pressed against the limit plate 10 on one side. After the workpiece is placed in place, the first preset welding point is located between the two electrodes. Then, the grounding bolt and nut assembly is inserted into the upper electrode 4. The grounding bolt and nut assembly is fixed in the upper electrode 4 by the ball screw. Then, the lifting mechanism moves, driving the upper electrode 4 downward. At this time, both the upper and lower electrodes are energized with high voltage. When the grounding bolt and nut assembly comes into contact with the workpiece, the high voltage current causes the grounding bolt and nut assembly to be welded to the workpiece. Then, the lifting mechanism drives the upper electrode 4 upward. At this time, the grounding bolt and nut assembly is welded to the workpiece. The ball screw on the upper electrode 4 can no longer hold the grounding bolt and nut assembly, so the upper electrode 4 moves upward alone and no longer moves with the grounding bolt and nut assembly.

[0032] Then, start cylinder 2, extend the piston rod of the cylinder, and drive the slide plate 3 to move until the slider 11 on the other side moves to the limit plate 10 on the other side. At this time, the second preset welding point moves between the electrodes. Then repeat the above action to weld the new grounding bolt and nut assembly onto the workpiece. After the second grounding bolt and nut assembly is welded, remove the workpiece. At this point, the welding operation of the grounding bolt and nut assembly of the workpiece is completed; all parts are reset, the cylinder is reset, and the lifting mechanism is reset.

[0033] During the above-mentioned operation, the sliders 11 on both sides are buffered by the buffer 12 as they approach the limiting plate 10, which reduces the force of the sliders 11 hitting the limiting plate 10 as much as possible. The positioning block 16 also reduces the impact of the sliders 11 on the limiting plate 10 to a certain extent.

Claims

1. A projection welding auxiliary positioning device for a grounding bolt and nut assembly, characterized in that: It includes a base frame (1), a limiting part, a cylinder (2), a sliding plate (3), a support and positioning part, and an upper electrode (4); the base frame (1) is set on the ground by a bracket; the limiting part is set on the base frame (1), and the sliding plate (3) is set on the limiting part; the cylinder (2) is set on the base frame (1), and the end of its piston rod is connected to the sliding plate (3); the support and positioning part is set on the sliding plate (3), and the machined part is set on the support and positioning part, and the machined part is located between the upper electrode (4) and the lower electrode column (5).

2. The projection welding auxiliary positioning device for the grounding bolt and nut assembly according to claim 1, characterized in that: The base frame (1) has a hole in the center, and the lower electrode rod (6) passes through the central hole of the base frame (1); the lower electrode column (5) is set at the top of the lower electrode rod (6), and the lower electrode column (5) is located directly above the base frame (1); the lower electrode rod (6) is held by the lower clamp, and the lower clamp is set on the bracket; the upper electrode component (4) is set at the bottom of the upper electrode rod (7), and the upper electrode rod (7) is held by the upper clamp, and the upper clamp is set on the lifting mechanism; the upper electrode component (4) is located directly above the lower electrode column (5).

3. The projection welding auxiliary positioning device for the grounding bolt and nut assembly according to claim 2, characterized in that: The upper electrode (4) is a solid copper column, and a stepped inner hole is provided at the center of its bottom end face. The inner diameter of the bottom end of the stepped inner hole is larger than the inner diameter of the top end. The inner diameter of the bottom end of the stepped inner hole of the upper electrode (4) is larger than the outer diameter of the nut, and the inner diameter of the top end of the stepped inner hole is larger than the outer diameter of the bolt rod of the grounding bolt (17). Multiple through holes are symmetrically arranged around the bottom end of the side wall of the upper electrode (4), and each through hole is provided with a ball screw (8). The steel ball of the ball screw (8) is located at the junction of the through hole and the bottom inner wall of the stepped inner hole. The ball screw (8) includes a spring, a steel ball and a housing. The housing is set in the through hole at the bottom end of the side wall of the upper electrode (4), the spring is located inside the housing, and it presses against the steel ball.

4. The projection welding auxiliary positioning device for the grounding bolt and nut assembly according to claim 3, characterized in that: The limiting part includes a guiding mechanism and a buffering mechanism; the center line of the first side of the base frame (1) is perpendicular to the center line of the second side of the base frame (1); the guiding mechanism includes two guide members, both of which are disposed on the top surface of the base frame (1); the buffering mechanism includes two buffer members (12), which are disposed at both ends of the top surface of the base frame (1) along the center line of the first side of the base frame (1).

5. The projection welding auxiliary positioning device for the grounding bolt and nut assembly according to claim 4, characterized in that: The guide includes a guide rail (9), a limiting plate (10), and a slider (11); the guide rail (9) is set on the top surface of the base frame (1), and its center line is parallel to the center line of the first side of the base frame (1); both ends of the guide rail (9) are provided with limiting plates (10); two sliders (11) are slidably arranged on the guide rail (9); the distance between the two limiting plates (10) is equal to the maximum distance between the two sliders (11) plus the distance between the preset welding points on the workpiece; the slide plate (3) is set on the top surface of each slider (11).

6. The projection welding auxiliary positioning device for the grounding bolt and nut assembly according to claim 5, characterized in that: The buffer (12) includes a spring buffer and a pressing block (13); the spring buffer is set at the end of the top surface of the base frame (1) along the center line of the first side of the base frame (1), and the pressing block (13) is set at the bottom surface of the slide plate (3), and the connecting line between the pressing block (13) and the spring buffer is parallel to the center line of the first side of the base frame (1); the spring buffer includes a cylinder, a spring, a slide rod and a contact; the cylinder is set on the top surface of the base frame (1) by a bracket, and its axis is parallel to the center line of the first side of the base frame (1); the end of the cylinder is provided with a hole, and the slide rod is inserted into the hole at the end of the cylinder, the end of the spring inside the cylinder is connected to the end of the slide rod by a connecting block, and a contact is provided at one end of the slide rod outside; there are two sliders (11) on each of the two guide rails (9), and there is a pressing block (13) between the two opposing sliders (11) on different guide rails (9).

7. The projection welding auxiliary positioning device for the grounding bolt and nut assembly according to claim 6, characterized in that: The slide plate (3) is provided with a strip-shaped hole, and the length direction of the strip-shaped hole is parallel to the center line of the first side of the base frame (1); the lower electrode rod (6) passes through the strip-shaped hole of the slide plate (3); the end of the piston rod of the cylinder (2) is connected to the slide plate (3) through a bracket; the axis of the piston rod of the cylinder (2) is parallel to the center line of the first side of the base frame (1).

8. The projection welding auxiliary positioning device for the grounding bolt and nut assembly according to claim 7, characterized in that: The support and positioning part includes a support block (14) and a positioning pin (15); there are multiple support blocks (14), and they are all set on the top surface of the slide plate (3), and the top surface of each support block (14) supports the planar area of ​​the bottom surface of the workpiece; the positioning pin (15) is set on the top surface of the slide plate (3), and the positioning pin (15) passes through the pin hole corresponding to the position on the workpiece; the connecting line between the two preset welding points on the workpiece is parallel to the center line of the first side of the base frame (1).

9. The projection welding auxiliary positioning device for the grounding bolt and nut assembly according to claim 8, characterized in that: A positioning block (16) is added; the positioning block (16) is set on the base frame (1); the slide plate (3) has a strip-shaped notch on the end face near the cylinder (2), and the positioning block (16) contacts the inner wall of the strip-shaped notch of the slide plate (3). The length of the strip-shaped notch of the slide plate (3) is equal to the distance between two preset welding points on the workpiece.

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