Anti-deformation shearing fork assembly assembly welding clamping tool

Abstract

The application discloses a kind of anti-deformation shear fork assembly group welding clamping tool, it is related to electric arc welding equipment field, it solves the problem that existing shear fork assembly group welding clamping tool only clamps outside when using, inner support cannot be flexibly avoided adjustment, welding heat receiving is prone to pipe wall distortion, hole position deviation, uneven stress and the like, including base, lifting platform, inner support mechanism and outer support mechanism, inner support mechanism includes sliding frame, push plate, arc plate and clamping plate, outer support mechanism includes support ring, the application is controlled push plate in square tube and is telescopic sliding by inner support mechanism, the position of clamping plate is adjusted, and when reaching around welding point position, clamping plate is controlled to support in square tube inner wall side, support and hold operation to inner wall of welding position is completed, the position of support ring is controlled around welding point position of square tube outer wall by outer support mechanism, and resistance holds, inhibits shear fork assembly thermal deformation, improves the concentricity precision of shaft sleeve welding.

Description

Technical Field

[0001] This invention relates to the field of arc welding equipment technology, specifically to a welding clamping fixture for anti-deformation scissor lift assembly. Background Technology

[0002] Scissor lift assemblies are core load-bearing transmission components in engineering machinery such as aerial work platforms, lifting equipment, and telescopic supports. Their structure is primarily formed by welding square tubing to an internal bushing. The bushing, as the core hinge transmission structure of the scissor lift assembly, directly determines the hinge flexibility, assembly concentricity, and overall load-bearing stability of the scissor lift mechanism through its welding precision and structural flatness. During the batch welding process of scissor lift assemblies, the circumferential welding process between the square tubing and the bushing is a crucial step in quality control.

[0003] Currently, most existing welding fixtures for scissor lift assemblies employ external single-point or partial rigid clamping structures, which can only provide unilateral limiting clamping of the outer wall of the scissor lift square tube, lacking a comprehensive rigid support structure for the welding area. During the full-circumferential welding of the bushing, the welding arc generates localized high temperatures, causing uneven thermal expansion and contraction of the metal in the square tube welding area. This can easily lead to problems such as local collapse, wall distortion, and warping deformation, resulting in substandard overall structural flatness of the scissor lift assembly. It can also cause misalignment of the bushing and square tube assembly hole positions and excessive concentricity deviations. Subsequent pin assembly is prone to problems such as jamming, excessive clearance, and wobbling, significantly reducing product assembly accuracy and service life. Summary of the Invention

[0004] The purpose of this invention is to provide a welding clamping fixture for anti-deformation scissor lift assembly that facilitates the suppression of thermal deformation of the scissor lift assembly and improves the concentricity accuracy of bushing welding, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a welding clamping fixture for anti-deformation scissor lift assembly, comprising a base, an inner support mechanism, and an outer support mechanism. A lifting platform is fixedly connected to the base. The inner support mechanism includes two sets of sliding frames mounted on the base. A push plate is provided on each sliding frame. An arc-shaped plate is hinged to the push plate. Clamping plates are provided on both sides of the arc-shaped plate. The inner support mechanism can control the push plate to slide and extend within the square tube, adjust the position of the clamping plates, and control the clamping plates to support the inner wall of the square tube when they reach the welding point, thus completing the support and clamping operation on the inner wall of the welding position. The outer support mechanism includes a support ring mounted on the base. The outer support mechanism can control the position of the support ring to clamp the outer wall of the square tube around the welding point, which helps to suppress the thermal deformation of the scissor lift assembly and improve the concentricity accuracy of the bushing welding.

[0006] Preferably, the inner support mechanism further includes a first fixed plate fixedly installed on the sliding frame. The sliding frame has a sliding groove, and a sliding block is slidably connected in the sliding groove. A second fixed plate is fixedly connected to the side of the sliding block, and a first elastic element fixedly connected to the inner wall of the sliding groove is fixedly connected to the side of the sliding block. The push plate is fixedly connected to the end of the first fixed plate and the second fixed plate away from the sliding frame. The push plate is provided with a control element for controlling the sliding state of the clamping plate, which facilitates the control of the push plate to slide and extend within the square tube, adjust the position of the clamping plate, and control the clamping plate to support the inner wall of the square tube when it reaches the welding point, thereby completing the support and clamping operation of the inner wall of the welding position.

[0007] Preferably, the control component includes a connecting pipe fixedly installed on the arc-shaped plate, the connecting pipe passing through the push plate and rotatably connected to the inner wall of the push plate, a swing groove being formed on the arc-shaped plate, guide grooves being formed on both sides of the arc-shaped plate, a guide plate being slidably connected in the guide groove, the side of the clamping plate being fixedly connected to the guide plate, and an adjusting component for controlling the pressure in the guide groove on the base, so as to facilitate control of the sliding state of the clamping plate.

[0008] Preferably, the adjusting component includes a tension spring fixedly installed on the side of the guide plate away from the clamping plate, the tension spring being fixedly connected to the inner wall of the guide groove, a spring-loaded spring fixedly connected to the outer wall of the connecting tube and fixedly connected to the inner wall of the push plate, both ends of the connecting tube being connected to the guide grooves on both sides respectively, an annular groove being provided on the push plate, multiple sets of side holes communicating with the annular groove being provided on the side of the connecting tube, and a pressure-pressurizing component for pressurizing the guide groove, so as to facilitate control of the pressure in the guide groove.

[0009] Preferably, the pressurizing component includes a pressurizing device fixedly installed on the base. The output end of the pressurizing device is connected to a first pipe, which is a serpentine pipe. A second pipe is fixedly connected inside the sliding frame. One end of the first pipe is connected to the second pipe. A third pipe is provided on both the first and second fixed plates. A connecting pipe is provided on the sliding block, which is connected to the third pipe on the second fixed plate. The upper outer wall of the second pipe is slidably sleeved with the inner wall of the connecting pipe. The lower end of the second pipe is connected to the third pipe on the first fixed plate. The pushing plate is provided with a sensing element for sensing the position status of the pushing plates on both sides, which facilitates pressurization in the guide groove.

[0010] Preferably, the sensing element includes a sliding rod installed inside the push plate, the sliding rod being slidably connected to the inner wall of the push plate in a horizontal direction, a fourth pipe communicating with the annular groove on the push plate, a second elastic element fixedly connected to one end of the sliding rod on both the first fixing plate and the second fixing plate, and a fifth pipe communicating with the third pipe and the fourth pipe on the sliding rod, facilitating the sensing of the position status of the push plates on both sides.

[0011] Preferably, the external support mechanism includes a mounting frame installed on the base, an electric telescopic rod fixedly connected to the mounting frame, a fixed plate fixedly connected to the telescopic end of the electric telescopic rod, a rotating frame rotatably connected to the outer wall of the fixed plate, and the side of the support ring rotatably connected to the rotating frame, so as to facilitate the clamping of the square tube around the welding point by controlling the position of the support ring.

[0012] Preferably, the base is provided with two sets of first sliding grooves and two sets of second sliding grooves. The sliding frame is slidably connected to the inner wall of the first sliding groove in a horizontal direction, and the mounting frame is slidably connected to the inner wall of the second sliding groove in a horizontal direction. The first sliding groove is provided with a first electric screw for driving the sliding frame to slide and adjust, and the second sliding groove is provided with a second electric screw for driving the mounting frame to slide and adjust, so as to facilitate the adjustment of the position of the clamping plate and the support ring.

[0013] Preferably, the upper side of the lifting platform is fixedly connected with multiple sets of clamps for auxiliary clamping and fixing of the outer wall of the square tube.

[0014] Preferably, both the clamping plate and the support ring are provided with high-temperature resistant silicone pads on the side near the square tube to prevent damage to the inner and outer walls of the square tube during clamping.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention provides a welding clamping fixture for anti-deformation scissor lift assembly, which solves the problems of existing scissor lift assembly welding clamping fixtures, which only clamp on the outside and cannot flexibly adjust the inner support, leading to pipe wall distortion, hole displacement, and uneven force when heated during welding. The inner support mechanism controls the push plate to slide and extend within the square tube, adjusting the position of the clamping plate. When it reaches the area around the welding point, the clamping plate is controlled to support the inner wall of the square tube, completing the support and clamping operation of the inner wall of the welding position. The outer support mechanism controls the position of the support ring to clamp the area around the welding point on the outer wall of the square tube. The inner and outer supports work together to form an inner and outer clamping of the welding position, suppressing thermal deformation and improving the concentricity accuracy of the bushing welding. Attached Figure Description

[0016] Figure 1This is a schematic diagram of the overall structure of the present invention; Figure 2 for Figure 1 Enlarged view of region A in the middle; Figure 3 This is a schematic diagram of the internal structure of the base of the present invention; Figure 4 This is a partial structural cross-sectional view of the external support mechanism of the present invention; Figure 5 for Figure 4 Enlarged view of region B in the middle; Figure 6 for Figure 4 Enlarged view of region C; Figure 7 This is a partial structural diagram of the inner wall support state of the square tube of the present invention; Figure 8 This is a partial structural cross-sectional view of the internal support mechanism of the present invention; Figure 9 for Figure 8 Enlarged view of region D in the middle; Figure 10 This is a partial structural diagram of the internal support mechanism of the present invention; Figure 11 This is a partial structural breakdown diagram of the internal support mechanism of the present invention; Figure 12 for Figure 11 Enlarged view of region E in the middle.

[0017] In the diagram: 1-Base; 2-Lifting platform; 3-Sliding frame; 4-Push plate; 5-Arc plate; 6-Clamping plate; 7-Support ring; 8-First fixing plate; 9-Sliding groove; 10-Sliding block; 11-Second fixing plate; 12-First elastic element; 13-Connecting pipe; 14-Swing groove; 15-Guide groove; 16-Guide plate; 17-Tension spring; 18-Curled spring; 19-Annular groove; 20-Side hole; 21-Pressurizing device; 2 2-First pipe; 23-Second pipe; 24-Third pipe; 25-Connecting pipe; 26-Sliding rod; 27-Fourth pipe; 28-Second elastic element; 29-Fifth pipe; 30-Mounting bracket; 31-Electric telescopic rod; 32-Fixed disc; 33-Rotating bracket; 34-First slide groove; 35-Second slide groove; 36-First electric screw; 37-Second electric screw; 38-Fixing clamp; 39-Square tube; 40-Shaft sleeve. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figures 1-7 This invention provides a technical solution: a welding clamping fixture for anti-deformation scissor lift assembly, comprising a base 1, an inner support mechanism, and an outer support mechanism. A lifting platform 2 is fixedly connected to the base 1. Multiple sets of clamping clips 38 for auxiliary clamping and fixing of the outer wall of a square tube 39 are fixedly connected to the upper side of the lifting platform 2. The inner support mechanism includes two sets of sliding frames 3 installed on the base 1. A push plate 4 is provided on the sliding frame 3. An arc plate 5 is hinged on the push plate 4. Clamping plates 6 are provided on both sides of the arc plate 5. The inner support mechanism can control the push plate 4 to slide and extend within the square tube 39, adjust the position of the clamping plates 6, and control the clamping plates 6 to support the inner wall of the square tube 39 when they reach the welding point, thus completing the support and clamping operation of the inner wall of the welding position. The outer support mechanism includes a support ring 7 installed on the base 1. The outer support mechanism can control the position of the support ring 7 to clamp the outer wall of the square tube 39 around the welding point. High-temperature resistant silicone pads are provided on the side of the clamping plates 6 and the support ring 7 near the square tube 39.

[0020] Please see Figures 3-12The internal support mechanism shown in the figure also includes a first fixed plate 8 fixedly installed on the sliding frame 3. The sliding frame 3 has a sliding groove 9, and a sliding block 10 is slidably connected within the sliding groove 9. A second fixed plate 11 is fixedly connected to the side of the sliding block 10, and a first elastic element 12 fixedly connected to the inner wall of the sliding groove 9 is fixedly connected to the side of the sliding block 10. A push plate 4 is fixedly connected to the end of the first fixed plate 8 and the second fixed plate 11 away from the sliding frame 3. The push plate 4 has a control element for controlling the sliding state of the clamping plate 6. The control element includes a connecting pipe 13 fixedly installed on the arc-shaped plate 5. The connecting pipe 13 passes through the push plate 4 and is rotatably connected to the inner wall of the push plate 4. The arc-shaped plate 5 has a swing groove 14. Guide grooves 15 are provided on both sides, and guide plates 16 are slidably connected in the guide grooves 15. The side of the clamping plate 6 is fixedly connected to the guide plate 16. The base 1 is provided with an adjusting component for controlling the pressure in the guide grooves 15. The adjusting component includes a tension spring 17 fixedly installed on the side of the guide plate 16 away from the clamping plate 6. The tension spring 17 is fixedly connected to the inner wall of the guide groove 15. A spring spring 18 fixedly connected to the inner wall of the push plate 4 is fixedly connected to the outer wall of the connecting tube 13. The two ends of the connecting tube 13 are respectively connected to the guide grooves 15 on both sides. An annular groove 19 is provided on the push plate 4. Multiple sets of side holes 20 connected to the annular groove 19 are provided on the side of the connecting tube 13. The base 1 is provided with a pressurizing component for pressurizing the guide grooves 15.

[0021] Please see Figures 3-12 The pressure-pressurizing component shown in the diagram includes a pressure-pressurizing device 21 fixedly mounted on a base 1. The output end of the pressure-pressurizing device 21 is connected to a first pipe 22, which is a serpentine pipe. A second pipe 23 is fixedly connected inside a sliding frame 3. One end of the first pipe 22 is connected to the second pipe 23. A third pipe 24 is respectively provided on the first fixed plate 8 and the second fixed plate 11. A connecting pipe 25 connected to the third pipe 24 on the second fixed plate 11 is provided on the sliding block 10. The upper outer wall of the second pipe 23 is slidably sleeved with the inner wall of the connecting pipe 25. The lower end is connected to the third pipe 24 on the first fixed plate 8. The push plate 4 is provided with a sensing element for sensing the position status of the push plates 4 on both sides. The sensing element includes a sliding rod 26 installed in the push plate 4. The sliding rod 26 is slidably connected to the inner wall of the push plate 4 in the horizontal direction. The push plate 4 is provided with a fourth pipe 27 that is connected to the annular groove 19. The first fixed plate 8 and the second fixed plate 11 are both fixedly connected with a second elastic element 28 that is fixedly connected to one end of the sliding rod 26. The sliding rod 26 is provided with a fifth pipe 29 that can be connected to the third pipe 24 and the fourth pipe 27.

[0022] Please see Figures 1-6The external support mechanism shown in the figure includes a mounting frame 30 mounted on the base 1. An electric telescopic rod 31 is fixedly connected to the mounting frame 30. A fixed plate 32 is fixedly connected to the telescopic end of the electric telescopic rod 31. A rotating frame 33 is rotatably connected to the outer wall of the fixed plate 32. The side of the support ring 7 is rotatably connected to the rotating frame 33. Two sets of first sliding grooves 34 and two sets of second sliding grooves 35 are respectively opened on the base 1. The sliding frame 3 is slidably connected to the inner wall of the first sliding groove 34 in the horizontal direction. The mounting frame 30 is slidably connected to the inner wall of the second sliding groove 35 in the horizontal direction. A first electric screw 36 for driving the sliding frame 3 to slide and adjust is provided in the first sliding groove 34. A second electric screw 37 for driving the mounting frame 30 to slide and adjust is provided in the second sliding groove 35.

[0023] Working principle: The square tube 39 to be welded is placed on the lifting platform 2 and initially clamped and fixed by the fixing clamp 38 on the lifting platform 2. At the same time, the lifting platform 2 is slightly raised and lowered according to the size of the square tube 39, changing the height of the square tube 39 so that the axis height of the bushing 40 on the square tube 39 is exactly at the center position between the first fixing plate 8 and the second fixing plate 11. By inserting the bushing 40 to be welded into the mating hole on the square tube 39, the first electric screw 36 and the second electric screw 37 are activated. The second electric screw 37 drives the mounting bracket 30 and the support ring 7 together. Move to the desired position, and push the fixed plate 32 and the rotating frame 33 with the electric telescopic rod 31 so that the side of the support ring 7 abuts against the outer wall of the square tube 39 for support. Control the clamping force with the electric telescopic rod 31, and at the same time ensure that the axis of the support ring 7 and the axis of the bushing 40 are in a straight line. During the welding process, control the welding head through the rotating frame 33 to reach the position where the bushing 40 connects with the mating hole for welding with the arc welding arm, and control the welding head to rotate around the outer ring of the bushing 40. At this time, the rotating frame 33 will rotate together, improving the continuity of the welding operation.

[0024] The first electric screw 36 drives the sliding frame 3 to slide along the first sliding groove 34, causing the sliding frames 3 on both sides to push the first fixing plate 8 and the second fixing plate 11 towards the side of the bushing 40 to be welded. The first fixing plate 8 and the second fixing plate 11 are inserted into the square tube 39. The approximate position of the bushing 40 to be welded is determined based on the position of the mounting frame 30. The sliding frames 3 on both sides are controlled to move the arc plate 5 to a position close to the outer wall of the bushing 40. In order to ensure that the upper and lower sets of arc plates 5 can swing freely in the horizontal direction and avoid jamming during the movement, a spring spring 18 is set to ensure that the two ends of the arc plate 5 are on the same vertical line in the initial state. This is coordinated with the push plate 4 and the swing groove. The design of 14 allows the arc plate 5 to swing to both sides during the sliding process inside the square tube 39, enabling the arc plate 5 to pass through the already welded bushing 40 and move to the bushing 40 to be welded for support. At the same time, since the vertical height of the arc plate 5 is relatively large at this time, in order to avoid the tops of the upper and lower sets of arc plates 5 from colliding with each other, a first elastic element 12 and a sliding block 10 are also provided. During the movement of the sliding frame 3, the first elastic element 12 will push the sliding block 10 out a small distance first, so that the arc plate 5 on the second fixed plate 11 and the arc plate 5 on the first fixed plate 8 have a certain distance in the horizontal direction, so as to avoid the upper and lower sets of arc plates 5 interfering with each other during the swinging process and affecting the movement.

[0025] When the top ends of the sliding rods 26 on the two sets of upper push plates 4 abut together, the sliding frame 3 continues to move, causing the sliding rods 26 to be squeezed into the push plate 4, compressing the second elastic element 28. At the same time, after sliding, the fifth pipe 29 is connected to the third pipe 24 and the fourth pipe 27 at both ends respectively. The second fixed plate 11 is squeezed, causing the sliding block 10 to slide and compress the first elastic element 12 in the sliding groove 9. The side of the upper arc plate 5 is offset by the outer wall of the bushing 40, so that the upper arc plate 5 just wraps around the upper side of the bushing 40. The lower arc plate 5 continues to be pushed by the sliding frame 3 during the compression of the first elastic element 12 until the top ends of the two sets of lower sliding rods 26 abut together and are completely pressed into the push plate 4. At this time, the lower... The square arc plate 5 is offset by the outer wall of the bushing 40 and just wraps around the lower side of the bushing 40. The first pipe 22 is pressurized by the pressurizing device 21. The fluid is transported to the third pipe 24 on the upper and lower sides through the first pipe 22, the second pipe 23 and the connecting pipe 25. Then it is transported to the guide groove 15 through the fifth pipe 29, the fourth pipe 27, the side hole 20 and the connecting pipe 13. This pushes the clamping plates 6 on both sides to abut and clamp the inner wall of the square tube 39. The clamping force is controlled to a suitable state by the pressurizing device 21. The tension spring 17 is stretched. At this time, the clamping plates 6 and the support ring 7 can simultaneously achieve the synchronous clamping operation of the inner and outer walls of the welding position, reduce the deformation of the surrounding area during the welding process and improve the stability of the welding.

[0026] After welding, the pressurizing device 21 draws the fluid back in the opposite direction, causing the guide plates 16 on both sides to slide in the opposite direction into the guide groove 15. The clamping plate 6 releases its clamping state on the inner wall of the square tube 39. The first electric screw 36 drives the sliding frame 3 to slide in the opposite direction. The two sets of push plates 4 on the lower side first release their mutual contact state, and then the first elastic element 12 gradually returns to its original position. The two sets of push plates 4 on the upper side gradually separate, and the four sets of arc plates 5 all return to their original position and swing to a near-vertical state. This facilitates the removal of the square tube 39 from the inside by the reverse swing of the arc plates 5 during the withdrawal process, without being blocked by the already welded bushing 40. The electric telescopic rod 31 drives the support ring 7 away from the square tube 39, releasing the clamping of the outer wall of the square tube 39. By readjusting the position of the mounting frame 30 and the sliding frame 3, the next bushing 40 to be welded can be reached, and the clamping and welding operation of the next set of bushings 40 can be completed again.

[0027] It is worth noting that: suitable sealing structures (similar to the sliding sealing structure of an electro-hydraulic rod) are set at the sliding connections between the guide groove 15 and the guide plate 16, the connecting pipe 25 and the second pipe 23, and the sliding rod 26 and the inner wall of the push plate 4 to prevent fluid leakage. The first elastic element 12 and the second elastic element 28 can be replaced by any existing elastic structure such as a spring. By setting the sliding rod 26, the connection state between the third pipe 24 and the fourth pipe 27 can be controlled according to the position of the sliding rod 26. Only when the push plates 4 on both sides are fully in contact can the clamping plate 6 be pressurized to clamp. This also plays an auxiliary role in sensing and controlling the position of the arc plates 5 on both sides, avoiding the direct control of the clamping plate 6 to slide out before the arc plates 5 on both sides reach the set position, which would affect the support effect on the inner wall of the required position. The internal clamping plate 6 suppresses collapse, and the external support ring 7 suppresses warping. The synchronous clamping inside and outside ensures the concentricity of the bushing 40 welding.

[0028] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0029] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A welding clamping fixture for anti-deformation scissor lift assembly, characterized in that, include: A base (1) is fixedly connected to a lifting platform (2); Also includes: The inner support mechanism includes two sets of sliding frames (3) installed on the base (1). The sliding frames (3) are provided with push plates (4). The push plates (4) are hinged with arc plates (5). Both sides of the arc plates (5) are respectively provided with clamping plates (6) that can clamp the inner wall of the square tube. An external support mechanism, the external support mechanism including a support ring (7) mounted on the base (1) for clamping the outer wall of the square tube.

2. The anti-deformation scissor lift assembly welding clamping fixture according to claim 1, characterized in that: The inner support mechanism further includes a first fixing plate (8) fixedly installed on the sliding frame (3). The sliding frame (3) has a sliding groove (9). A sliding block (10) is slidably connected in the sliding groove (9). A second fixing plate (11) is fixedly connected to the side of the sliding block (10). A first elastic element (12) is fixedly connected to the inner wall of the sliding groove (9) on the side of the sliding block (10). The push plate (4) is fixedly connected to the end of the first fixing plate (8) and the second fixing plate (11) away from the sliding frame (3). The push plate (4) is provided with a control element for controlling the sliding state of the clamping plate (6).

3. The anti-deformation scissor lift assembly welding clamping fixture according to claim 2, characterized in that: The control component includes a connecting pipe (13) fixedly installed on the arc plate (5), the connecting pipe (13) passing through the push plate (4) and rotatably connected to the inner wall of the push plate (4), the arc plate (5) is provided with a swing groove (14), the arc plate (5) is provided with guide grooves (15) on both sides, a guide plate (16) is slidably connected in the guide groove (15), the side of the clamping plate (6) is fixedly connected to the guide plate (16), and the base (1) is provided with an adjusting component for controlling the pressure in the guide groove (15).

4. The anti-deformation scissor lift assembly welding clamping fixture according to claim 3, characterized in that: The adjusting component includes a tension spring (17) fixedly installed on the side of the guide plate (16) away from the clamping plate (6). The tension spring (17) is fixedly connected to the inner wall of the guide groove (15). The outer wall of the connecting tube (13) is fixedly connected to a spring spring (18) fixedly connected to the inner wall of the push plate (4). The two ends of the connecting tube (13) are respectively connected to the guide grooves (15) on both sides. The push plate (4) is provided with an annular groove (19). The side of the connecting tube (13) is provided with multiple sets of side holes (20) connected to the annular groove (19). The base (1) is provided with a pressurizing component for pressurizing the guide groove (15).

5. The anti-deformation scissor lift assembly welding clamping fixture according to claim 4, characterized in that: The pressurizing component includes a pressurizing device (21) fixedly installed on the base (1). The output end of the pressurizing device (21) is connected to a first pipe (22). The first pipe (22) is a serpentine pipe. A second pipe (23) is fixedly connected inside the sliding frame (3). One end of the first pipe (22) is connected to the second pipe (23). A third pipe (24) is opened on both the first fixed plate (8) and the second fixed plate (11). A connecting pipe (25) is opened on the sliding block (10) and is connected to the third pipe (24) on the second fixed plate (11). The upper outer wall of the second pipe (23) is slidably sleeved with the inner wall of the connecting pipe (25). The lower end of the second pipe (23) is connected to the third pipe (24) on the first fixed plate (8). A sensing element for sensing the position status of the two sides of the push plate (4) is provided on the push plate (4).

6. The anti-deformation scissor lift assembly welding clamping fixture according to claim 5, characterized in that: The sensing element includes a sliding rod (26) installed in the push plate (4). The sliding rod (26) is slidably connected to the inner wall of the push plate (4) in the horizontal direction. A fourth pipe (27) connected to the annular groove (19) is provided on the push plate (4). A second elastic element (28) fixedly connected to one end of the sliding rod (26) is fixedly connected to both the first fixing plate (8) and the second fixing plate (11). A fifth pipe (29) connected to the sliding rod (26) is provided, which can communicate with the third pipe (24) and the fourth pipe (27).

7. The anti-deformation scissor lift assembly welding clamping fixture according to claim 1, characterized in that: The external support mechanism includes a mounting frame (30) installed on the base (1), an electric telescopic rod (31) fixedly connected to the mounting frame (30), a fixed plate (32) fixedly connected to the telescopic end of the electric telescopic rod (31), a rotating frame (33) rotatably connected to the outer wall of the fixed plate (32), and the side of the support ring (7) rotatably connected to the rotating frame (33).

8. The anti-deformation scissor lift assembly welding clamping fixture according to claim 7, characterized in that: The base (1) is provided with two sets of first sliding grooves (34) and two sets of second sliding grooves (35). The sliding frame (3) is slidably connected to the inner wall of the first sliding groove (34) in the horizontal direction. The mounting frame (30) is slidably connected to the inner wall of the second sliding groove (35) in the horizontal direction. The first sliding groove (34) is provided with a first electric screw (36) for driving the sliding frame (3) to slide and adjust. The second sliding groove (35) is provided with a second electric screw (37) for driving the mounting frame (30) to slide and adjust.

9. The anti-deformation scissor lift assembly welding clamping fixture according to claim 1, characterized in that: The upper side of the lifting platform (2) is fixedly connected with multiple sets of fixing clamps (38) for auxiliary clamping and fixing of the outer wall of the square tube.

10. The anti-deformation scissor lift assembly welding clamping fixture according to claim 1, characterized in that: Both the clamping plate (6) and the support ring (7) are provided with high-temperature resistant silicone pads on the side near the square tube.

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