Workpiece positioning and clamping system of multifunctional spot welding machine

Abstract

The invention belongs to the field of spot welding machining, and particularly relates to a multifunctional spot welding machine workpiece positioning and clamping system which comprises a sliding mechanism connected with a pneumatic spot welding machine, and the sliding mechanism is provided with two clamping mechanisms which are used for fixing a workpiece and are distributed left and right. 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 are matched to drive the two clamping mechanisms to horizontally move for spot welding and feeding. The clamping mechanism comprises an outer connecting frame connected with the X-axis sliding part. Compared with a traditional positioning and clamping mode during spot welding, the spot welding time of the workpieces can be shortened, so that the time for spot welding of the workpieces in batches is greatly shortened, the spot welding efficiency is improved, the whole process is few in human intervention process and high in automation degree, the requirement of spot welding machining for the proficiency of workers is reduced, and the production cost is reduced. And long-time efficient and stable work can be maintained.

Description

Technical Field

[0001] The present invention belongs to the field of spot welding processing, and particularly relates to a workpiece positioning and clamping system for a multifunctional spot welder. Background Art

[0002] The welding head of a pneumatic spot welder usually consists of two electrodes, which are respectively located above and below the workpiece, forming a "one-up-and-one-down" structure. During operation, the upper electrode moves downward to clamp the workpiece together with the lower electrode, ensuring that the contact surfaces of the upper and lower workpieces are closely fitted. The current forms a loop through the upper electrode, the workpiece, and the lower electrode, generating 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, a welding point is formed under the action of pressure to complete the welding.

[0003] Currently, a spot welder can weld nuts on some workpieces, making these parts of the workpieces convenient for connection and fixation with other workpieces. For example, at the connection of some steel plates or the housing of electronic devices, nuts will be welded at the connection of the steel plates or the housing of electronic devices. During welding, the worker holds the workpiece, aligns the position where the nut is to be installed at the edge of the workpiece with the lower electrode of the spot welder, and then the feeding device sends the nut to the workpiece and positions it directly above the lower electrode of the spot welder. Then, the upper electrode of the spot welder moves downward under the drive of a horizontal push-pull cylinder to abut against the upper end surface of the nut and is energized for welding. After welding one nut, the above method is used to cycle through all the positions on the same workpiece where nuts need to be welded for spot welding processing.

[0004] The above-mentioned spot welder has the following problems during spot welding:

[0005] 1) During the process of welding nuts on the workpiece, after the previous nut is welded, for the next nut, the worker needs to manually control the workpiece to switch the next welding position between the upper and lower electrodes before the feeding device can feed the material. To weld one nut, the worker needs to first adjust the position of the workpiece, then the feeding device operates, and finally the spot welding device operates. If a large number of nuts need to be welded on a single workpiece, the time required to process and weld one workpiece is relatively long, and if the workpiece is processed in large batches for a long time, the overall efficiency needs to be improved.

[0006] 2) Moreover, this method also requires the worker to fix the workpiece during spot welding and adjust the position of the workpiece in a timely manner after spot welding to cooperate with the next welding. This requires a high level of proficiency in the worker's operation, and as the human consumption gradually increases over time, there may be misoperations, resulting in the welding position of the nut and the workpiece shifting, and it is impossible to perform workpiece welding processing efficiently and stably. Summary of the Invention

[0007] In order to solve the above problems, the present invention provides a workpiece positioning and clamping system for a multifunctional spot welder to solve the problems mentioned in the above background art.

[0008] To achieve the above object, the embodiments of the present application provide the following technical solutions: The present invention provides a multifunctional spot welder workpiece positioning and clamping system, including a sliding mechanism connected to a pneumatic spot welder, and two clamping mechanisms for fixing the workpiece and distributed left and right are arranged on the sliding mechanism. The sliding mechanism includes a Y-axis sliding part connected to the spot welder, and an X-axis sliding part is arranged on the Y-axis sliding part. The Y-axis sliding part and the X-axis sliding part cooperate to drive the two clamping mechanisms to move horizontally for spot welding and feeding. The clamping mechanism includes an outer frame connected to the X-axis sliding part, and an inner frame is movably arranged at the central position of the outer frame. A reset connection part is commonly arranged between two corresponding corners of the outer frame and the inner frame. The reset connection part guides the inner frame when it receives a downward pressure and controls its reset when the downward pressure is lost. On the upper side of the inner frame, pressing parts are arranged around its central through hole, and the four pressing parts respectively abut against the four sides of the workpiece for clamping.

[0009] According to a preferred embodiment, the Y-axis sliding part includes two Y-axis guide rails fixedly arranged on the left and right side walls of the pneumatic spot welder. A guiding groove extending along its length direction and having a convex shape is formed in the Y-axis guide rail, and a convex-shaped Y-axis sliding seat is slidably connected in the guiding groove. The two Y-axis sliding seats are commonly connected to the X-axis sliding part, and a horizontal push-pull cylinder is further connected to the X-axis sliding part. The horizontal push-pull cylinder is fixedly arranged on the pneumatic spot welder.

[0010] According to a preferred embodiment, the X-axis sliding part includes a mounting frame fixedly connected to the upper sides of the two Y-axis sliding seats. The rear side of the mounting frame is fixedly connected to the telescopic end of the horizontal push-pull cylinder. Two screw rods I are rotatably arranged on the front and rear sides of the mounting frame. Two X-axis sliders distributed left and right are threadedly arranged on the screw rod I. The mutually approaching sides of the front and rear two X-axis sliders are commonly fixed to the corresponding outer frame.

[0011] According to a preferred embodiment, a motor is fixedly arranged on the right side of the mounting frame. The output shaft of the motor is fixedly connected to one end of the corresponding screw rod I. The left ends of the two screw rods I are commonly connected by a sprocket group for transmission.

[0012] According to a preferred embodiment, the reset connection part includes an L-shaped connecting plate. The lower side of the vertical section of the connecting plate is fixedly connected to the upper side of the outer frame. A guiding column I is slidably arranged on the horizontal section of the connecting plate. The lower end of the guiding column I is fixedly connected to the upper side of the inner frame. A disk-shaped limiting plate is fixedly arranged at the upper end of the guiding column I. A reset spring is sleeved on the surface of the guiding column I. The upper and lower ends of the reset spring are fixedly connected to the lower side of the limiting plate and the upper side of the horizontal section of the connecting plate.

[0013] According to a preferred embodiment, the pressing member includes a fixed seat fixedly arranged on the upper side of the inner frame. A second screw rod is threadedly arranged on the fixed seat, and two second guiding columns symmetrical about the second screw rod are slidably connected to the fixed seat. One ends of adjacent second guiding columns close to the central working station of the inner frame are fixedly connected together with a clamping block. A connecting sliding plate is movably arranged between the adjacent clamping blocks and the fixed seat. The connecting sliding plate is slidably connected to the corresponding second guiding column. One end of the second screw rod is rotatably connected to one side of the corresponding connecting sliding plate. A clamping spring is sleeved on the surface of the second guiding column close to the clamping block. The two sides of the adjacent connecting sliding plates and the clamping blocks close to each other are respectively fixedly connected to two ends of the corresponding clamping spring.

[0014] According to a preferred embodiment, the clamping block is L-shaped, and the sides of the vertical sections of the four clamping blocks close to each other are arc surfaces for guiding the workpiece.

[0015] According to a preferred embodiment, two symmetrically arranged feeding connecting frames are arranged above the rear side of the mounting frame. Nut feeders are respectively fixedly connected to the mutually remote ends of the two feeding connecting frames. The mutually close ends of the two feeding connecting frames are fixedly connected to the same pneumatic spot welder.

[0016] Compared with the prior art, a workpiece positioning and clamping system of a multifunctional spot welder provided by an embodiment of the present invention has the following beneficial effects: It is equipped with two groups of clamping mechanisms, which can lock a variety of different workpieces, and can cooperate with the upper electrode of the pneumatic spot welder to drive the workpiece to move down for spot welding during spot welding. At the same time, an X-axis sliding part and a Y-axis sliding part capable of driving the two groups of clamping mechanisms to move horizontally together are arranged on the pneumatic spot welder, ensuring that when the previous workpiece is spot welded according to the established welding route, the latter workpiece can synchronously place nuts in cooperation with the external nut feeder according to the same welding route. Compared with the traditional positioning and clamping method during spot welding, the spot welding time of the workpiece can be shortened, thus greatly shortening the time for batch spot welding of workpieces, improving the spot welding efficiency, and the whole process has less manual intervention, higher automation degree, reducing the requirement for the proficiency of workers in spot welding processing, and can maintain long-term high-efficiency and stable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an external overall three-dimensional structure diagram during welding of the workpiece on the right clamping mechanism in the present invention.

[0018] Figure 2 It is a three-dimensional structure diagram of the relative positions of the sliding mechanism and the clamping mechanism in the present invention.

[0019] Figure 3 It is an external three-dimensional structure diagram of the clamping mechanism in the present invention.

[0020] Figure 4 is Figure 3 The enlarged structure diagram of part A in

[0021] Figure 5 is the external three-dimensional structure diagram of the pressing member in the present invention.

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

[0023] Figure 7 is the external overall three-dimensional structure diagram during the welding of the workpiece on the left clamping mechanism in the present invention.

[0024] Reference numerals in the figure: 1, pneumatic spot welder; 2, sliding mechanism; 21, Y-axis sliding part; 211, Y-axis guide rail; 212, Y-axis sliding seat; 213, horizontal push-pull cylinder; 22, X-axis sliding part; 221, mounting frame; 222, screw one; 223, X-axis slider; 3, clamping mechanism; 31, outer frame; 32, inner frame; 33, reset connection part; 331, connecting plate; 332, guide post one; 333, limiting plate; 334, reset spring; 34, pressing member; 341, fixed seat; 342, screw two; 343, guide post two; 344, clamping block; 345, connecting sliding plate; 346, clamping spring; 4, upper electrode; 5, lower electrode; 6, loading station; 7, spot welding station; 8, lifting cylinder; 9, feeding connecting frame; 10, nut feeder. Detailed implementation manners

[0025] The following will Figure 1 - with reference to the Figure 7 make a further detailed description of the present application.

[0026] Please refer to Figure 1 , a workpiece positioning and clamping system for a multifunctional spot welder, which is used in cooperation with the pneumatic spot welder 1, includes a sliding mechanism 2 connected to the pneumatic spot welder 1, and two groups of clamping mechanisms 3 for fixing the workpiece and distributed left and right are arranged on the sliding mechanism 2.

[0027] Refer to Figure 1 and Figure 6 , the sliding mechanism 2 includes a Y-axis sliding part 21 connected to the spot welder, and an X-axis sliding part 22 is 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 loading.

[0028] Refer to Figure 2 and Figure 5, the Y-axis sliding part 21 includes two Y-axis guide rails 211 fixedly arranged on the left and right side walls of the pneumatic spot welder 1. A guiding groove extending along its length direction and in a convex shape is formed on the Y-axis guide rail 211. A Y-axis sliding seat 212 in a convex shape is slidably connected in the guiding groove. The two Y-axis sliding seats 212 are jointly connected to the X-axis sliding part 22. A horizontal push-pull cylinder 213 is also connected to the X-axis sliding part 22. An installation groove is formed in the middle position of the front side arm of the pneumatic spot welder 1, and the horizontal push-pull cylinder 213 is fixedly arranged in this installation groove. By driving the installation frame 221 to move along the Y-axis guide rail 211 through the horizontal push-pull cylinder 213, the clamping mechanism 3 is driven to move back and forth along the Y-axis.

[0029] Refer to Figure 1 , the X-axis sliding part 22 includes an installation frame 221 fixedly connected to the upper sides of both Y-axis sliding seats 212. The rear side of the installation frame 221 is fixedly connected to the telescopic end of the horizontal push-pull cylinder 213. Screw rods 222 are rotatably arranged on the front and rear sides of the installation frame 221. Two X-axis sliders 223 distributed left and right are arranged on the screw rods 222 in a threaded manner. The mutually approaching sides of the front and rear two X-axis sliders 223 are jointly connected to the corresponding clamping mechanism 3. A motor is fixedly arranged on the right side of the installation frame 221. The output shaft of the motor is fixedly connected to one end of the corresponding screw rod 222. The left ends of the two screw rods 222 are jointly connected through a sprocket group. By driving the screw rod 222 through the motor and cooperating with the sprocket group, the two X-axis sliders 223 can drive the clamping mechanism 3 to move back and forth along the X-axis.

[0030] Refer to Figure 1 and Figure 2 , two symmetrically arranged feeding connecting frames 9 are arranged above the rear side of the installation frame 221. Nut feeders 10 are fixedly connected to the mutually remote ends of the two feeding connecting frames 9 respectively. The mutually approaching ends of the two feeding connecting frames 9 are both fixedly connected to the same pneumatic spot welder 1. It should be particularly noted that the pneumatic spot welder 1 is equipped 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 movably installed above the front side of the pneumatic spot welder 1 through a lifting cylinder 8. The mutually approaching ends of the two feeding connecting frames 9 are also fixedly connected to the telescopic end of the lifting cylinder 8. Thus, when the lifting cylinder 8 drives the upper electrode 4 to move towards the lower electrode 5, the nut feeder 10 will also be driven to move downward close to the workpiece where the nut needs to be placed, which is more conducive to the nut being stably placed at the specified position. The discharge port of the nut feeder 10 is slightly higher than the lower end face of the upper electrode 4 on the pneumatic spot welder 1. The position below each nut feeder 10 on the installation frame 221 is set as a nut loading station 6, and the position between the upper and lower electrodes 5 of the spot welder is set as a spot welding station 7.

[0031] Refer to Figure 2 and Figure 3, the clamping mechanism 3 includes an outer frame 31. The front and rear sides of the outer frame 31 are respectively fixedly connected to the corresponding X-axis sliders 223. An inner frame 32 is movably arranged at the central position of the outer frame 31. A reset connection part 33 is jointly arranged between two corresponding corners of the outer frame 31 and the inner frame 32. The reset connection part 33 can guide the inner frame 32 when it is subjected to a downward pressure and control its reset when the downward pressure is lost. On the upper side of the inner frame 32, pressing members 34 are arranged around its central through hole. The four pressing members 34 respectively abut against the four sides of the workpiece to clamp it.

[0032] Refer to Figure 3 and Figure 4 , the reset connection part 33 includes an L-shaped connecting plate 331. The lower side of the vertical section of the connecting plate 331 is fixedly connected to the upper side of the outer frame 31. A first guiding column 332 is slidably arranged on the horizontal section of the connecting plate 331. The lower end of the first guiding column 332 is fixedly connected to the upper side of the inner frame 32. A disk-shaped limiting plate 333 is fixedly arranged at the upper end of the first guiding column 332. A reset spring 334 is sleeved on the surface of the first guiding column 332. The upper and lower ends of the reset spring 334 are fixedly connected to the lower side of the limiting plate 333 and the upper side of the horizontal section of the connecting plate 331 respectively. When the upper electrode 4 on the spot welder moves downward to abut against the nut to be welded placed above the workpiece, the pressure will be transmitted to the inner frame 32, causing the inner frame 32 to drive the workpiece to move downward to abut against the lower electrode 5 on the spot welder. When the welding is completed and the upper electrode 4 moves upward, the inner frame 32 will 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, facilitating subsequent movement and adjustment of the welding position.

[0033] Refer to Figure 3 and Figure 5, the pressing member 34 includes a fixed seat 341 fixedly arranged on the upper side of the inner frame 32. A second screw 342 is threadedly arranged on the fixed seat 341. One end of the second screw 342 away from the central station of the inner frame 32 is fixedly provided with an adjusting knob. Two second guide columns 343 symmetrically arranged with the second screw 342 as the center are slidably connected to the fixed seat 341. One end of two adjacent second guide columns 343 close to the central station of the corresponding inner frame 32 is fixedly connected to a clamping block 344. A connecting sliding plate 345 is movably arranged between the adjacent clamping blocks 344 and the fixed seat 341. The connecting sliding plate 345 is slidably connected to the corresponding second guide column 343. One end of the second screw 342 is rotatably connected to one side of the corresponding connecting sliding plate 345. A clamping spring 346 is sleeved on the surface of the second guide column 343 close to the clamping block 344. One side of the adjacent connecting sliding plates 345 and the clamping blocks 344 close to each other are fixedly connected to both ends of the corresponding clamping spring 346 respectively. The clamping block 344 is arranged in an L shape, and the arc surface 3441 for guiding the workpiece is arranged on one side of the vertical sections of the four clamping blocks 344 close to each other. By driving the second screw 342 to rotate through the adjusting knob 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, ensuring that after the workpiece is placed on the upper sides of the horizontal sections of the four abutting blocks, the abutting blocks can cooperate with the corresponding clamping springs 346 to have a certain pressing force on the workpiece, so as to clamp the workpiece.

[0034] During specific operation, before the initial electric welding preparation, the left clamping mechanism 3 is located at the nut feeding station 6 on the left, and the right clamping mechanism 3 is located at the spot welding station 7 in the middle, and both are in the no-load state. Then the staff place a workpiece on both the left and right clamping mechanisms 3 and press the workpiece through the corresponding four pressing blocks. Then the staff manually place nuts on the right workpiece, and all the positions that need to be spot welded on this workpiece are pre-arranged with nuts. Nuts are not pre-arranged on the left workpiece. At this time, the electrode 4 on the pneumatic spot welder 1 at the spot welding station 7 is directly opposite the first nut spot welding position of the lower workpiece, and the discharge port of the nut feeding device at the left feeding station 6 is directly opposite the first nut spot welding position of the lower workpiece, as Figure 1 shown.

[0035] During operation, the pneumatic spot welder 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 lifting pneumatic device on the pneumatic spot welder 1 drives the upper electrode 4 to move downward to contact the nut on the lower workpiece, applying pressure to the inner frame 32 to push the inner frame 32 downward, so that the lower side of the workpiece contacts the lower electrode 5 on the pneumatic spot welder 1. Then, after power-on, the nut is welded to the workpiece. At the same time, during the downward movement of the upper electrode 4, the telescopic cylinder of the pneumatic spot welder 1 drives the nut feeding device at the left feeding station 6 to move downward synchronously through the feeding connecting frame 9, so that the discharge port of the nut feeding device is close to the workpiece without a nut placed on the left side. Finally, the nut feeding device controls the nut inside it to be discharged from the discharge port and placed stably at the position where the nut needs to be welded on the workpiece. When the first nut at the spot welding position is welded and fixed, the upper electrode 4 moves upward, and the corresponding nut feeder 10 moves upward. The workpiece at the spot welding position and the workpiece at the feeding position are both 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. Similarly, the next nut placement point of the workpiece at the feeding station 6 is below the discharge port of the nut feeder 10. By repeating this cycle, when the workpiece at the spot welding station 7 has completed spot welding all the nuts on the corresponding workpiece, the nuts have also been placed at the predetermined positions on the next workpiece to be welded. Then, through the X-axis sliding part 22, the welded workpiece is moved to the right feeding station 6. During this movement, the operator removes the welded workpiece and replaces it with a new workpiece to be welded for nut feeding preparation. At the same time, the workpiece with nuts placed at the left feeding station 6 is moved to the spot welding station 7 for spot welding work, as Figure 7 shown. Repeat the operation to complete the work.

[0036] It should be particularly noted that when the pneumatic spot welder 1 processes some non-standard workpieces, the two clamping mechanisms 3 can be controlled to move towards the middle position of the mounting holes, and finally the two clamping mechanisms 3 are respectively located on the left and right sides of the spot welding station 7, as Figure 6 shown, so that the two clamping mechanisms 3 will not block the spot welding station 7, thus enabling the pneumatic spot welder 1 to have enough space to customize spot welding for some non-standard workpieces.

[0037] The above are only embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be included in the patent protection scope of the present invention by the same token.

Claims

1. A multifunctional spot welding machine workpiece positioning and clamping system, characterized in that: It comprises a sliding mechanism (2) connected to a pneumatic spot welding machine (1), wherein the sliding mechanism (2) is provided with two groups of clamping mechanisms (3) distributed on the left and right for fixing the workpiece; The sliding mechanism (2) comprises a Y-axis sliding part (21) connected to the spot welding machine, 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 horizontally to perform spot welding and material loading; The clamping mechanism (3) comprises an outer frame (31) connected to the X-axis sliding portion (22); an inner frame (32) is movably arranged at the center of the outer frame (31); a reset connection portion (33) is arranged between two corresponding corners of the outer frame (31) and the inner frame (32); the reset connection portion (33) guides the inner frame (32) when it is subjected to downward pressure and controls its reset when the downward pressure is lost; the upper side of the inner frame (32) is provided with abutment members (34) around its central through hole; the four abutment members (34) respectively abut against the four sides of the workpiece for clamping.

2. A multifunctional spot welding machine workpiece positioning and clamping system according to claim 1, characterized in that: 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 convex guide grooves extending along the length direction thereof; a convex Y-axis slide seat (212) is slidably connected in the guide groove; the two Y-axis slide seats (212) are connected to the X-axis sliding part (22); the X-axis sliding part (22) is also connected to 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 multifunctional spot welding machine workpiece positioning and clamping system according to claim 2, characterized in that: The X-axis sliding part (22) comprises a mounting frame (221) fixedly connected to the upper sides of the two Y-axis slide seats (212); the rear side of the mounting frame (221) is fixedly connected to 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); two X-axis slide blocks (223) distributed on the left and right are threadedly arranged on the screw rods (222); and the sides of the front and rear X-axis slide blocks (223) that are close to each other are fixedly connected to the corresponding outer frame (31).

4. A multifunctional spot welding machine workpiece positioning and clamping system according to claim 3, characterized in that: A motor is fixedly arranged on the right side of the installation frame (221), and the output shaft of the motor is fixedly connected to one end of the corresponding screw rod one (222), and the left ends of the two screw rods one (222) are connected together through a sprocket group.

5. The multifunctional spot welding machine workpiece positioning and clamping system according to claim 1, characterized in that: The reset connection portion (33) comprises an L-shaped connection plate (331), the lower side of the vertical section of the connection plate (331) is fixedly connected to the upper side of the outer frame (31), the horizontal section of the connection plate (331) is slidably provided with a guide column (332), the lower end of the guide column (332) is fixedly connected to the upper side of the inner frame (32), the upper end of the guide column (332) is fixedly provided with a disc-shaped limit plate (333), the surface of the guide column (332) is sleeved with a reset spring (334), and the upper and lower ends of the reset spring (334) are fixedly connected to the lower side of the limit plate (333) and the upper side of the horizontal section of the connection plate (331).

6. The multifunctional spot welding machine workpiece positioning and clamping system according to claim 1, characterized in that: The abutting member (34) comprises a fixing seat (341) fixedly arranged on the upper side of the inner frame (32), a screw rod (342) being threadedly arranged on the fixing seat (341), and two guide posts (343) symmetrically centered on the screw rod (342) being slidably connected to the fixing seat (341), one end of two adjacent guide posts (343) close to the central area of ​​the inner frame (32) being fixedly connected to a clamping block (344), and the adjacent clamping blocks (344) and the fixing seat (341) are connected to each other. ) are movably provided with a connecting sliding plate (345), the connecting sliding plate (345) is slidingly connected to the corresponding guide column 2 (343), one end of the screw rod 2 (342) is rotationally connected to one side of the corresponding connecting sliding plate (345), the surface of the guide column 2 (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 fixedly connected to the two ends of the corresponding clamping springs (346) respectively.

7. A multifunctional spot welding machine workpiece positioning and clamping system according to claim 6, characterized in that: The clamping block (344) is configured to be L-shaped, and one side of the four clamping blocks (344) vertical sections close to each other is configured to be an arc surface for guiding the workpiece.

8. The multifunctional spot welding machine workpiece positioning and clamping system according to claim 3 is characterized in that: Two left-right symmetrical feeding connection frames (9) are arranged above the rear side of the installation frame (221); the ends of the two feeding connection frames (9) that are away from each other are respectively fixedly connected to nut feeders (10); and the ends of the two feeding connection frames (9) that are close to each other are both fixedly connected to the same pneumatic spot welding machine (1).

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