A multifunction spot welder workpiece positioning and clamping system

Abstract

The present application belongs to the field of spot welding processing, and particularly relates to a multifunctional workpiece positioning and clamping system of a spot welding machine, comprising a sliding mechanism connected with a pneumatic spot welding machine, two groups of clamping mechanisms distributed left and right on the sliding mechanism for fixing workpieces. The sliding mechanism comprises a Y-axis sliding part connected with the spot welding machine, and an X-axis sliding part arranged on the Y-axis sliding part. The Y-axis sliding part and the X-axis sliding part drive the two groups of clamping mechanisms to move horizontally for spot welding and feeding. The clamping mechanism comprises an outer connecting frame connected with the X-axis sliding part. Compared with the positioning and clamping mode in traditional spot welding, the present application can shorten the spot welding time of workpieces, thereby greatly shortening the time for batch spot welding of workpieces, improving the spot welding efficiency, and reducing the human intervention process and the requirement for worker proficiency in spot welding processing. Moreover, the present application can maintain long-time high-efficiency and stable work.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of spot welding processing, and particularly relates to a multifunctional workpiece positioning and clamping system of a spot welding machine. BACKGROUND

[0002] The welding head of a pneumatic spot welding machine is usually composed of two electrodes, which are located above and below the workpiece respectively, forming an "up-down" structure. During work, the upper electrode moves downward together with the lower electrode to clamp the workpiece, ensuring that the contact surfaces of the upper and lower workpieces are tightly attached, and the current forms a loop through the upper electrode, the workpiece and the lower electrode to generate resistance heat at the contact surface of the workpiece. The resistance heat locally heats the contact surface of the workpiece to a molten state, and at the same time, under the action of pressure, a welding point is formed to complete welding.

[0003] At present, the spot welding machine can weld nuts on some workpieces, so that these workpieces can be conveniently connected and fixed with other workpieces, such as the connection between some steel plates or the shell of electronic equipment, and nuts are welded at the connection between the steel plates or the shell of electronic equipment. When welding, the worker holds the workpiece, aligns the position of the workpiece edge where the nut is installed with the lower electrode of the spot welding machine, and then the feeding device sends the nut to the workpiece and above the lower electrode of the spot welding machine. Then the upper electrode of the spot welding machine moves downward under the drive of the horizontal push-pull cylinder and comes into contact with the upper end surface of the nut and is electrified to weld. After welding one nut, the above method is used to cycle to spot weld all positions on the same workpiece where nuts need to be welded.

[0004] The above-mentioned spot welding machine has the following problems when spot welding:

[0005] 1) During the process of welding nuts on the workpiece, after the welding of the current nut is completed, the next nut needs to be manually controlled by the worker to switch the next welding position between the upper and lower electrodes before it can be fed by the feeding device. Welding a nut requires the worker to first adjust the position of the workpiece, then the feeding device acts, and finally the spot welding device acts. If a large number of nuts need to be welded on a single workpiece, it takes a long time to process and weld one workpiece, and if a large number of workpieces are processed for a long time, the overall efficiency needs to be improved.

[0006] 2) And this way also needs workers to fix the workpiece during spot welding and adjust the position of the workpiece in time after spot welding to cooperate with the next welding. The operation proficiency of the workers is required to be high, and as the time goes on, the human consumption gradually increases, which may cause misoperation and lead to the deviation of the welding position of the nut and the workpiece, so that the workpiece welding processing cannot be carried out efficiently and stably. SUMMARY

[0007] In order to solve the above problems, the present application provides a multifunctional workpiece positioning and clamping system of a spot welding machine, which is used to solve the problems mentioned in the above background.

[0008] In order to achieve the above object, the embodiment of the present application provides the following technical scheme: the present application provides a multifunctional spot welding machine workpiece positioning and clamping system, which comprises a sliding mechanism connected with a pneumatic spot welding machine, two groups of clamping mechanisms for fixing the workpiece and distributed left and right are arranged on the sliding mechanism. The sliding mechanism comprises a Y-axis sliding part connected with the spot welding machine, an X-axis sliding part is arranged on the Y-axis sliding part, and the Y-axis sliding part and the X-axis sliding part drive the two groups of clamping mechanisms to move horizontally for spot welding and feeding. The clamping mechanism comprises an outer frame connected with the X-axis sliding part, an inner frame is movably arranged at the center position of the outer frame, a reset connecting part is arranged between the two corners corresponding to the outer frame and the inner frame, the reset connecting part guides the inner frame when the inner frame is subjected to a downward pressure and controls the reset of the inner frame when the downward pressure is lost, and four abutting members are arranged around the central through hole on the upper side of the inner frame. Four abutting members abut and clamp four sides of the workpiece respectively.

[0009] According to an advantageous embodiment, the Y-axis sliding part comprises two Y-axis guide rails fixedly arranged on the left and right side walls of the pneumatic spot welding machine, a guide groove extending along the length direction of the Y-axis guide rail and in convex shape is formed in the Y-axis guide rail, a Y-axis sliding seat in convex shape is slidably connected in the guide groove, the two Y-axis sliding seats are connected with the X-axis sliding part, a horizontal push-pull air cylinder is further connected to the X-axis sliding part, and the horizontal push-pull air cylinder is fixedly arranged on the pneumatic spot welding machine.

[0010] According to an advantageous embodiment, the X-axis sliding part comprises a mounting frame fixedly connected with the upper sides of the two Y-axis sliding seats, the mounting frame is fixedly connected with the extension end of the horizontal push-pull air cylinder at the rear side, screw rods are rotatably arranged at the front and rear sides of the mounting frame, two X-axis sliding blocks distributed left and right are threadedly arranged on the screw rods, and the front and rear X-axis sliding blocks are fixedly connected with the corresponding outer frames at the side close to each other.

[0011] According to an advantageous embodiment, a motor is fixedly arranged at the right side of the mounting frame, the output shaft of the motor is fixedly connected with one end of the corresponding screw rod, and the left ends of the two screw rods are connected through a chain wheel set.

[0012] According to an advantageous embodiment, the reset connecting part comprises an L-shaped connecting plate, the lower side of the vertical section of the connecting plate is fixedly connected with the upper side of the outer frame, a guide column one is slidably arranged on the horizontal section of the connecting plate, the lower end of the guide column one is fixedly connected with the upper side of the inner frame, a limiting plate in disc shape is fixedly arranged at the upper end of the guide column one, a reset spring is sleeved on the surface of the guide column one, and the upper and lower ends of the reset spring are fixedly connected with the lower side of the limiting plate and the upper side of the horizontal section of the connecting plate.

[0013] According to an advantageous embodiment, the abutting part comprises a fixed seat fixedly arranged on the upper side of the inner frame, a screw rod two is threadedly arranged on the fixed seat, and two guide columns two symmetrically centered on the screw rod two are slidably connected to the fixed seat, the end of the two adjacent guide columns two close to the center station of the inner frame is fixedly connected with a clamping block, and a connecting sliding plate is movably arranged between the adjacent clamping blocks and the fixed seat, the connecting sliding plate is slidably connected with the corresponding guide column two, one end of the screw rod two is rotatably connected with one side of the corresponding connecting sliding plate, and the surface of the guide column two close to the clamping block is sleeved with a clamping spring, and the side of the adjacent connecting sliding plate and the clamping block close to each other is fixedly connected with the two ends of the corresponding clamping spring.

[0014] According to an advantageous embodiment, the clamping block is arranged in an L shape, and the side of the vertical segment of the four clamping blocks close to each other is arranged as an arc surface for guiding the workpiece.

[0015] According to an advantageous embodiment, the mounting frame is provided with two left-right symmetrical feeding connecting frames above the rear side, the end of the two feeding connecting frames away from each other is fixedly connected with a nut feeder respectively, and the end of the two feeding connecting frames close to each other is fixedly connected with the same pneumatic spot welder.

[0016] Compared with the prior art, the workpiece positioning and clamping system of the multifunctional spot welder provided by the embodiment of the application has the following beneficial effects: two sets of clamping mechanisms are arranged, different workpieces can be locked, and the workpiece can be driven downward by the upper electrode of the pneumatic spot welder to perform spot welding work. Meanwhile, the X-axis sliding part and the Y-axis sliding part that can drive the two sets of clamping mechanisms to move horizontally are arranged on the pneumatic spot welder, so that when the current workpiece is spot welded according to the predetermined welding route, the next workpiece can be placed in cooperation with the external nut feeder according to the same welding route, the workpiece spot welding time is shortened, the time for batch spot welding work is greatly shortened, the spot welding efficiency is improved, the human intervention process is less during the whole process, the automation degree is high, the skilled degree of workers required for spot welding is reduced, and long-time high-efficiency stable work can be maintained. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is an external overall perspective view of a workpiece during welding by the right clamping mechanism in the application.

[0018] Figure 2 It is a perspective view of the relative positions of the sliding mechanism and the clamping mechanism in the application.

[0019] Figure 3 It is an external perspective view of the clamping mechanism in the application.

[0020] Figure 4 For Figure 3 Enlarged structural view of part A.

[0021] Figure 5 For the external three-dimensional structure of the abutting member in the application.

[0022] Figure 6 For the state diagram when the two clamping mechanisms in the application are on both sides of the spot welding station.

[0023] Figure 7 For the external overall three-dimensional structure diagram when the workpiece is welded on the left clamping mechanism in the application.

[0024] In the drawing, the reference signs are: 1, pneumatic spot welding machine; 2, sliding mechanism; 21, Y-axis sliding part; 211, Y-axis guide rail; 212, Y-axis sliding block; 213, horizontal push-pull air cylinder; 22, X-axis sliding part; 221, mounting frame; 222, screw one; 223, X-axis sliding block; 3, clamping mechanism; 31, outer frame; 32, inner frame; 33, reset connecting part; 331, connecting plate; 332, guide column one; 333, limiting plate; 334, reset spring; 34, abutting member; 341, fixed seat; 342, screw two; 343, guide column two; 344, clamping block; 345, connecting sliding plate; 346, clamping spring; 4, upper electrode; 5, lower electrode; 6, feeding station; 7, spot welding station; 8, lifting air cylinder; 9, feeding connecting frame; 10, nut feeder. DETAILED DESCRIPTION

[0025] The following will be combined with the Figure 1 -Appendix Figure 7 Further detailed description of the present application.

[0026] Please refer to Figure 1 A multifunctional spot welding machine workpiece positioning and clamping system, used in cooperation with a pneumatic spot welding machine 1, comprising a sliding mechanism 2 connected with the pneumatic spot welding machine 1, and two groups of clamping mechanisms 3 distributed left and right on the sliding mechanism 2 to fix the workpiece.

[0027] Refer to Figure 1 and Figure 6 The sliding mechanism 2 comprises a Y-axis sliding part 21 connected with the spot welding machine, and an X-axis sliding part 22 arranged on the Y-axis sliding part 21. The Y-axis sliding part 21 and the X-axis sliding part 22 cooperate to drive the two groups of clamping mechanisms 3 to move horizontally for spot welding and feeding.

[0028] Refer to Figure 2 and Figure 5The Y-axis sliding part 21 comprises two Y-axis guide rails 211 fixedly arranged on the left and right side walls of the pneumatic spot welding machine 1, the Y-axis guide rails 211 are provided with a convex guide groove extending along the length direction thereof, and a convex Y-axis sliding seat 212 is slidably connected in the guide groove; the two Y-axis sliding seats 212 are connected with the X-axis sliding part 22, and the X-axis sliding part 22 is further connected with a horizontal push-pull cylinder 213; the middle part of the front side arm of the pneumatic spot welding machine 1 is provided with a mounting groove, and the horizontal push-pull cylinder 213 is fixedly arranged in the mounting groove. The horizontal push-pull cylinder 213 drives the mounting frame 221 to move along the Y-axis guide rail 211, and drives the clamping mechanism 3 to move back and forth along the Y-axis.

[0029] Referring to Figure 1 The X-axis sliding part 22 comprises a mounting frame 221 fixedly connected with the upper sides of the two Y-axis sliding seats 212, the rear side of the mounting frame 221 is fixedly connected with the extension end of the horizontal push-pull cylinder 213, and the front and rear sides of the mounting frame 221 are rotatably provided with a screw rod one 222; the screw rod one 222 is provided with two X-axis sliding blocks 223 distributed left and right on the screw rod one 222; the front and rear X-axis sliding blocks 223 are connected with the corresponding clamping mechanism 3 on the side close to each other. The right side of the mounting frame 221 is fixedly provided with a motor, the output shaft of the motor is fixedly connected with one end of the corresponding screw rod one 222, and the left ends of the two screw rods one 222 are connected through a chain wheel set. The motor drives the screw rod one 222 to drive the two X-axis sliding blocks 223 to move back and forth along the X-axis through the chain wheel set.

[0030] Referring to Figure 1 and Figure 2 The mounting frame 221 is provided with two feeding connecting frames 9 symmetrically arranged left and right above the rear side close to each other, and the ends of the two feeding connecting frames 9 away from each other are respectively fixedly connected with nut feeders 10; the ends of the two feeding connecting frames 9 close to each other are fixedly connected with the same pneumatic spot welding machine 1. It is particularly pointed out that the pneumatic spot welding machine 1 is provided with an upper electrode 4 and a lower electrode 5, the lower electrode 5 is fixedly arranged below the front side of the main body of the pneumatic spot welding machine 1, and the upper electrode 4 is movably arranged above the front side of the pneumatic spot welding machine 1 through a lifting cylinder 8. The ends of the two feeding connecting frames 9 close to each other are also fixedly connected with the extension end of the lifting cylinder 8. Therefore, when the lifting cylinder 8 drives the upper electrode 4 to move towards the lower electrode 5, the nut feeder 10 will also move downwards to approach the workpiece to be placed, thereby facilitating the stable placement of the nut in the specified position. The discharge port of the nut feeder 10 is slightly higher than the lower end surface of the upper electrode 4 of the pneumatic spot welding machine 1. The mounting frame 221 is provided with a nut feeding station 6 below each nut feeder 10, and a spot welding station 7 is arranged between the upper and lower electrodes 5 of the spot welding machine.

[0031] Referring to Figure 2 and Figure 3The clamping mechanism 3 comprises an outer frame 31, the front and rear sides of the outer frame 31 are fixedly connected with corresponding X-axis sliding blocks 223 respectively, an inner frame 32 is movably arranged at the center position of the outer frame 31, a reset connecting part 33 is jointly arranged between the two corners of the outer frame 31 and the inner frame 32, the reset connecting part 33 can guide the inner frame 32 when the inner frame 32 is subjected to a downward pressure and control the reset of the inner frame 32 when the downward pressure is lost, and four abutting members 34 are arranged around the central through hole of the upper side of the inner frame 32, and the four abutting members 34 abut and clamp the four sides of the workpiece respectively.

[0032] Referring to Figure 3 and Figure 4 The reset connecting part 33 comprises an L-shaped connecting plate 331, the lower side of the vertical section of the connecting plate 331 is fixedly connected with the upper side of the outer frame 31, a guide column one 332 is slidingly arranged on the horizontal section of the connecting plate 331, the lower end of the guide column one 332 is fixedly connected with the upper side of the inner frame 32, a limiting plate 333 in the shape of a disc is fixedly arranged at the upper end of the guide column one 332, a reset spring 334 is sleeved on the surface of the guide column one 332, and the upper and lower ends of the reset spring 334 are fixedly connected with the lower side of the limiting plate 333 and the upper side of the horizontal section of the connecting plate 331. When the upper electrode 4 on the spot welding machine moves downward and abuts against the nut to be welded above the workpiece, the pressure is transmitted to the inner frame 32, so that the inner frame 32 drives the workpiece to move downward and abut against the lower electrode 5 on the spot welding machine, and when the upper electrode 4 moves upward after welding, the inner frame 32 is reset under the action of the reset spring 334, so that the lower electrode 5 no longer abuts against the lower side of the workpiece, and the subsequent movement and adjustment of the welding position are facilitated.

[0033] Referring to Figure 3 and Figure 5The abutting piece 34 comprises a fixed seat 341 fixedly arranged on the upper side of the inner frame 32, a screw rod two 342 is threadedly arranged on the fixed seat 341, one end of the screw rod two 342 away from the center position of the inner frame 32 is fixedly arranged with an adjusting knob, and the fixed seat 341 is slidably connected with two guide columns two 343 which are symmetrically arranged with the screw rod two 342 as the center, the two guide columns two 343 adjacent to each other and close to the center position of the inner frame 32 are fixedly connected with a clamping block 344, and the clamping block 344 is movably arranged between the adjacent two guide columns two 343 and the fixed seat 341, the clamping block 344 is slidably connected with the corresponding guide column two 343, one end of the screw rod two 342 is rotatably connected with one side of the corresponding connecting sliding plate 345, the surface of the guide column two 343 close to the clamping block 344 is sleeved with a clamping spring 346, and the sides of the adjacent connecting sliding plates 345 and the clamping block 344 close to each other are fixedly connected with the two ends of the corresponding clamping spring 346. The clamping block 344 is arranged in an L shape, and the side of the vertical segment of the four clamping blocks 344 close to each other is arranged as an arc surface 3441 for guiding the workpiece. The screw rod two 342 is driven to rotate by the adjusting knob, so as to drive the connecting sliding plate 345 to move, the positions of the four abutting blocks are adjusted according to the size of the workpiece, and after the workpiece is placed on the upper side of the horizontal segment of the four abutting blocks, the abutting block can cooperate with the corresponding clamping spring 346 to have a certain abutting force on the workpiece, so as to clamp the workpiece.

[0034] In specific work, the left clamping mechanism 3 is located at the left nut feeding station 6, and the right clamping mechanism 3 is located at the middle spot welding station 7, both of which are in an empty state. Then the worker places a workpiece on the left and right clamping mechanisms 3 and abuts the workpiece through the corresponding four abutting blocks, and then the worker manually places a nut on the right workpiece, and arranges the nuts in advance at all positions of the workpiece that need to be spot welded, and the left workpiece is not arranged with nuts in advance. At this time, the electrode 4 of the pneumatic spot welding machine 1 of the spot welding station 7 is opposite to the first nut spot welding position of the lower workpiece, and at this time, the discharge port of the nut feeding device of the left feeding station 6 is opposite to the first nut spot welding position of the lower workpiece, as shown in FIG. Figure 1

[0035] ​When working, the pneumatic spot welding machine 1 cooperates with the X-axis sliding part 22 and the Y-axis sliding part 21 to start working according to the predetermined spot welding route. The upper electrode 4 on the pneumatic spot welding machine 1 is driven downward by the lifting pneumatic cylinder, and the nut on the workpiece below is contacted, the inner frame 32 is pushed downward by the pressure applied to the inner frame 32, so that the lower side of the workpiece is contacted with the lower electrode 5 on the pneumatic spot welding machine 1, and then the nut is welded on the workpiece after being electrified. At the same time, during the downward movement of the upper electrode 4, the telescopic pneumatic cylinder of the pneumatic spot welding machine 1 drives the nut feeding device of the left feeding station 6 downward through the feeding connecting frame 9, so that the discharge port of the nut feeding device is close to the workpiece without placing the nut on the left side, and finally the nut inside the nut feeding device is discharged from the discharge port and placed steadily at the position where the nut needs to be welded on the workpiece. After the first nut at the spot welding position is welded and fixed, the upper electrode 4 moves upward, the corresponding nut feeder 10 moves upward, and the workpiece at the spot welding position and the workpiece at the feeding position are adjusted in position under the cooperation of the Y-axis sliding part 21 and the X-axis sliding part 22, so that the next welding point of the workpiece at the spot welding position is below the upper electrode 4, and similarly, the next nut placing point of the workpiece at the feeding station 6 is below the discharge port of the nut feeder 10, so that the cycle can be repeated, that is, when the workpiece at the spot welding station 7 completes the spot welding of all nuts on the corresponding workpiece, the next workpiece to be welded has also placed the nuts according to the predetermined position of the workpiece, and then the X-axis sliding part 22 moves the welded workpiece to the right feeding station 6, during the movement, the worker takes down the welded workpiece and replaces it with a new workpiece to be welded to prepare for the nut feeding, and at the same time, the workpiece with nuts placed at the left feeding station 6 is moved to the spot welding station 7 to prepare for the spot welding work, as shown in Figure 7 The work is repeated.

[0036] It is particularly pointed out that when the pneumatic spot welding machine 1 processes some non-standard workpieces, the two sets of clamping mechanisms 3 can be controlled to move towards the middle position of the mounting hole, and finally the two sets of clamping mechanisms 3 are respectively located on the left and right sides of the spot welding station 7, as shown in Figure 6 so that the two sets of clamping mechanisms 3 do not block the spot welding station 7, so that the pneumatic spot welding machine 1 has enough space to customize the spot welding of some non-standard workpieces.

[0037] The above description is only an embodiment of the present application, and does not limit the patent range of the present application, and any equivalent structure or equivalent process transformation using the content of the specification and the drawings, or direct or indirect application in other related technical fields, are also included in the patent protection range of the present application.

Claims

1. A multi-functional spot welder workpiece positioning and clamping system, characterized by: Including the slip mechanism (2) connected with the pneumatic spot welder (1), the slip mechanism (2) is provided with two groups of clamping mechanisms (3) that are fixed to workpieces and are distributed left and right; The slip mechanism (2) includes a Y-axis sliding part (21) connected with the spot welder, an X-axis sliding part (22) is arranged on the Y-axis sliding part (21), and the Y-axis sliding part (21) and the X-axis sliding part (22) cooperate to drive the two groups of clamping mechanisms (3) to move for spot welding and feeding, the X-axis sliding part (22) includes a mounting frame (221); The clamping mechanism (3) includes an outer frame (31) connected with the X-axis sliding part (22), an inner frame (32) movably arranged at the center position of the outer frame (31), and a reset connecting part (33) commonly arranged between two corners of the outer frame (31) and the inner frame (32), the reset connecting part (33) guides the inner frame (32) when the inner frame (32) is subjected to a downward pressure and controls the reset of the inner frame (32) when the downward pressure is lost, and four abutting members (34) are arranged around the central through hole of the upper side of the inner frame (32), and the four abutting members (34) abut and clamp the four sides of the workpiece respectively; The reset connecting part (33) includes an L-shaped connecting plate (331), the lower side of the vertical section of the connecting plate (331) is fixedly connected with the upper side of the outer frame (31), the horizontal section of the connecting plate (331) is slidably provided with a guide column I (332), the lower end of the guide column I (332) is fixedly connected with the upper side of the inner frame (32), the upper end of the guide column I (332) is fixedly provided with a disc-shaped limiting plate (333), the surface of the guide column I (332) is sleeved with a reset spring (334), and the upper and lower ends of the reset spring (334) are fixedly connected with the lower side of the limiting plate (333) and the upper side of the horizontal section of the connecting plate (331); The mounting frame (221) is provided with two left-right symmetrical feeding connecting frames (9) above the near rear side, and the ends of the two feeding connecting frames (9) away from each other are fixedly connected with nut feeders (10) respectively, and the ends of the two feeding connecting frames (9) close to each other are fixedly connected with the same pneumatic spot welder (1); The pneumatic spot welder (1) is provided with an upper electrode (4) and a lower electrode (5), the lower electrode (5) is fixed below the front side of the main body of the pneumatic spot welder (1), the upper electrode (4) is installed above the front side of the pneumatic spot welder (1) through a lifting cylinder (8), the ends of the two feeding connecting frames (9) close to each other are also fixedly connected with the telescopic end of the lifting cylinder (8); the discharge port of the nut feeder (10) is higher than the lower end surface of the upper electrode (4) on the pneumatic spot welder (1), the mounting frame (221) is provided with a nut feeding station (6) below each nut feeder (10), and a spot welding station is arranged between the upper and lower electrodes of the pneumatic spot welder (1).

2. A multi-functional spot welder workpiece positioning and clamping system as defined in claim 1 wherein, The Y-axis sliding part (21) comprises two Y-axis guide rails (211) fixedly arranged on the left and right side walls of the pneumatic spot welding machine (1), the Y-axis guide rails (211) are provided with a convex guide groove extending along the length direction thereof, the guide groove is slidably connected with a convex Y-axis sliding seat (212), the two Y-axis sliding seats (212) are connected with the X-axis sliding part (22) together, the X-axis sliding part (22) is further connected with a Y-axis push-pull cylinder (213), and the Y-axis push-pull cylinder (213) is fixedly arranged on the pneumatic spot welding machine (1).

3. A multi-functional spot welder workpiece positioning and clamping system as defined in claim 2 wherein, The X-axis sliding part (22) comprises a mounting frame (221) fixedly connected with the upper sides of the two Y-axis sliding seats (212), the rear side of the mounting frame (221) is fixedly connected with the telescopic end of the Y-axis push-pull cylinder (213), screw rods (222) are rotatably arranged on the front and rear sides of the mounting frame (221), the screw rods (222) are threadedly provided with two X-axis sliding blocks (223) distributed on the left and right sides, and the front and rear X-axis sliding blocks (223) are fixedly connected with the corresponding outer frames (31) on the side close to each other.

4. A multi-functional spot welder workpiece positioning and clamping system as defined in claim 3, wherein: A motor is fixedly arranged on the right side of the mounting frame (221), the output shaft of the motor is fixedly connected with one end of the corresponding screw rod (222), and the left ends of the two screw rods (222) are connected through a chain wheel set.

5. The multi-functional spot welder work piece positioning and clamping system of claim 1 wherein, The abutting piece (34) comprises a fixed seat (341) fixedly arranged on the upper side of the inner frame (32), the fixed seat (341) is threadedly provided with a screw rod (342), the fixed seat (341) is slidably connected with two guide columns (343) symmetrically arranged with the screw rod (342) as the center, the ends of the adjacent two guide columns (343) close to the center region of the inner frame (32) are fixedly connected with a clamping block (344), the adjacent clamping blocks (344) and the fixed seat (341) are movably provided with a connecting sliding plate (345), the connecting sliding plate (345) is slidably connected with the corresponding guide column (343), one end of the screw rod (342) is rotatably connected with one side of the corresponding connecting sliding plate (345), the surface of the guide column (343) close to the clamping block (344) is sleeved with a clamping spring (346), and the sides of the adjacent connecting sliding plates (345) and the clamping blocks (344) close to each other are respectively fixedly connected with the two ends of the corresponding clamping spring (346).

6. A multi-functional spot welder work piece positioning and clamping system as defined in claim 5 wherein, The clamping block (344) is arranged in an L shape, and the sides of the vertical segments of the four clamping blocks (344) close to each other are arranged as arc surfaces for guiding the workpiece.

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