Small bus side wall skeleton welding tool

Abstract

The utility model discloses a small bus side wall framework welding frock for fixing small bus side wall framework, can adapt to the fixing of each structural component bending arc shape structural member of small bus side wall framework, can reduce welding deformation while improving welding precision, including welding platform and the main stand fixed system, top crossbeam fixed system of being established on it. The main stand fixed system has two groups, and the first, second stand positioning is carried out respectively, contains vertical positioning device, and the stand positioning mechanism in -line with the stand side through -hole axis center is pushed to the pincers telescopic shaft, and the stand clamping mechanism is held vertically through the cooperation of the first quick clamp pincers with the type pad. The top crossbeam fixed device of top crossbeam fixed system is held to the top crossbeam.

Description

Technical Field

[0001] This utility model relates to the field of new energy vehicle technology, specifically to welding fixtures for the side frame of minibuses. Background Technology

[0002] With the development of new energy electric vehicles, lightweighting is of paramount importance, especially as it significantly impacts the driving range of electric vehicles. Therefore, using aluminum alloy for the vehicle body frame can greatly reduce the overall weight and improve the driving range. However, aluminum alloy exhibits significant welding deformation, requiring clamping and positioning before welding to ensure dimensional requirements are met. The intelligent minibus is a pure electric small passenger vehicle. Its lightweight side structure includes irregularly curved aluminum alloy profiles. The curved surface of these profiles is difficult to fix in tooling, leading to inaccurate positioning, significant welding dimensional deviations, and substantial post-weld deformation. Existing tooling is insufficient for stably fixing the minibus's side frame. Utility Model Content

[0003] In view of this, the present invention discloses a welding fixture for the side frame of a minibus, the specific solution of which is as follows:

[0004] A welding fixture for the side frame of a minibus includes a welding platform, a main column fixing system, and a top crossbeam fixing system mounted on the welding platform.

[0005] The main column fixing system is used to fix two sets of main columns on the side frame of the minibus. The main column fixing system has two sets, including a vertical positioning device. The vertical positioning device includes a column clamping mechanism and a column positioning mechanism. The column positioning mechanism includes a column positioning base, a push clamp base, and a push clamp. The push clamp is set on the column positioning base through the push clamp base. The axis of the push clamp telescopic shaft is on the same straight line as the axis of the through hole opened on the bottom surface of the first column / second column.

[0006] The column clamping mechanism includes a bottom conformal pad and a first quick clamp. The upper surface of the bottom conformal pad is adapted to the lower bottom surface of the first main column / second main column, so that the upper surface of the bottom conformal pad can fit against the lower bottom surface of the first main column / second main column. The first quick clamp is disposed on one side of the bottom conformal pad, and the pressure head of the first quick clamp is located above the bottom conformal pad. The first quick clamp and the bottom conformal pad cooperate to clamp the first main column / second main column in the vertical direction.

[0007] The top crossbeam fixing system is used to fix the top crossbeam on the side frame of a minibus. It includes a top crossbeam fixing device, which includes a second quick clamp, a bottom support base, and a side limiting base. The upper surface of the bottom support base is an inclined surface that fits against the lower bottom wall of the top crossbeam. The side limiting base has a protruding limiting block on its side surface, which is also an inclined surface that fits against the side wall of the top crossbeam. The second clamp clamping arm is equipped with a top limiting block and a side limiting block. The lower surface of the top limiting block is an inclined surface that fits against the upper top wall of the top crossbeam, and the side limiting block is also an inclined surface that fits against the side wall of the top crossbeam. The side limiting block and the protruding limiting block of the side limiting base are positioned opposite each other on both sides of the top crossbeam. The top limiting block, the side limiting block, the bottom support base, and the side limiting base cooperate to clamp the top crossbeam.

[0008] As a supplement to the technical solution of this utility model, the top beam fixing system also includes a first clamping mechanism and a second clamping mechanism disposed on the welding platform. The first clamping mechanism and the second clamping mechanism have the same structure. The first clamping mechanism is located on the side of the top beam away from the first column, and the second clamping mechanism is located on the side of the top beam close to the first column. Both the first clamping mechanism and the second clamping mechanism include a clamping mechanism base, a screw sleeve, a screw rod, a rotating handle, and a clamping block.

[0009] The screw sleeve is located at the top of the base of the tightening mechanism. The axial direction of the screw sleeve is perpendicular to the side surface of the top crossbeam. The middle part of the screw is screwed into the screw sleeve. One end of the screw is provided with a tightening block, and the other end of the screw is provided with a rotating handle. Rotating the screw by rotating the handle can move the tightening block toward the top crossbeam, so that the tightening block is in contact with the side surface of the top crossbeam. The first tightening mechanism and the second tightening mechanism together clamp the top crossbeam.

[0010] As a supplement to the technical solution of this utility model, the end of the screw connected to the clamping block is a ball head structure. The clamping block is provided with a spherical groove that matches the ball head on the screw. The ball head of the screw is located in the spherical groove of the clamping block, thereby realizing a rotatable connection between the screw and the clamping block.

[0011] As a supplement to the technical solution of this utility model, a rear column fixing system is also included. The rear column fixing system includes a rear column fixing device, which has the same structure as the top beam fixing device.

[0012] The upper surface of the bottom support base of the rear column fixing device is in contact with the lower bottom wall of the rear column; the side surface of the protruding limiting block of the rear column fixing device is in contact with the side wall of the rear column; the lower surface of the top limiting block of the rear column fixing device is in contact with the upper top wall of the rear column; the side surface of the side limiting block of the rear column fixing device is in contact with the side wall of the rear column, and the protruding limiting block and the side limiting block of the rear column fixing device are arranged opposite to each other on both sides of the rear column.

[0013] As a supplement to the technical solution of this utility model, the rear column fixing system further includes a third clamping mechanism and a fourth clamping mechanism. The third clamping mechanism and the fourth clamping mechanism have the same structure as the first clamping mechanism. The third clamping mechanism is located on the rear side of the rear column, and the fourth clamping mechanism is located on the front side of the rear column. The third clamping mechanism and the fourth clamping mechanism together clamp the rear column.

[0014] As a supplement to the technical solution of this utility model, the rear column fixing system also includes a diagonal short beam positioning device and a diagonal short beam fixing device;

[0015] The inclined short beam positioning device includes a telescopic cylinder, a cylinder connecting block, and a positioning pin. The telescopic cylinder is set on the welding platform, the cylinder connecting block is set at the end of the piston rod of the telescopic cylinder, and the positioning pin is set on the cylinder connecting block. The telescopic cylinder drives the positioning pin to pass into the through hole on the inclined short beam.

[0016] The inclined short beam fixing device is connected to the third quick clamp and the inclined short beam support base. The clamping arm of the third quick clamp is provided with an inclined short beam clamping block. The lower end surface of the inclined short beam clamping block is an inclined surface that fits with the upper end surface of the inclined short beam. The inclined short beam support base is located below the inclined short beam, and its upper end is an inclined surface that fits with the lower end surface of the inclined short beam.

[0017] As a supplement to the technical solution of this utility model, a front column fixing system is also included. The front column fixing system includes a front column fixing device, which includes a fourth quick clamp and a front column support base. The clamping arm of the fourth quick clamp is provided with a front column clamping block. The lower end surface of the front column clamping block is an inclined surface that fits against the upper end surface of the front column. The front column support base is located below the front column, and its upper end is an inclined surface that fits against the lower end surface of the front column. The front column clamping block and the front column support base cooperate to clamp the front column vertically.

[0018] As a supplement to the technical solution of this utility model, the front column fixing system further includes a fifth tightening mechanism and a front column limiting base. The front column limiting base is disposed on one side of the front column, and the fifth tightening mechanism is disposed on the other side of the front column. The front column limiting base is provided with a tightening protrusion extending toward the front column. The fifth tightening mechanism has the same structure as the first tightening mechanism. The front column limiting base and the fifth tightening mechanism cooperate to clamp the front column.

[0019] As a supplement to the technical solution of this utility model, it also includes a sixth tightening mechanism and a seventh tightening mechanism. The sixth tightening mechanism and the seventh tightening mechanism have the same structure as the first tightening mechanism. The sixth tightening mechanism is located on the side of the first column away from the front frame and is used to apply a thrust to the first column in the direction of the front frame. The seventh tightening mechanism is located on the side of the second column away from the rear frame and is used to apply a thrust to the second column in the direction of the rear frame.

[0020] As a supplement to the technical solution of this utility model, it also includes a flipping and positioning machine connecting plate and a flipping and positioning machine. The flipping and positioning machine connecting plate is disposed at the end of the welding platform and is connected to the flipping and positioning machine. A processing through hole is opened on the welding platform.

[0021] Beneficial Effects: This utility model's welding fixture for the side frame of a minibus addresses the challenge of precise positioning caused by the curved arc structure of the first and second main columns. It achieves initial positioning through the cooperation of the push clamp and through-hole in the column positioning mechanism, followed by vertical clamping using a conformal positioning block and a first quick clamp, effectively solving the main column fixing problem. In the top beam fixing system, the bottom support base, side limiting base, and second quick clamp, combined with an inclined surface design, adapt to the non-parallel state of the top beam caused by the bending of the main columns, achieving a close fit and fixation with the end of the main columns. Furthermore, the tightening mechanism further ensures clamping stability. This utility model's welding fixture effectively solves the positioning and clamping problems of curved, inclined, and oblique components in the side frame of a minibus, improving the accuracy and stability of the pre-welding fixation of each component and ensuring welding quality. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0023] Figure 2 This is a three-dimensional structural diagram of the present invention.

[0024] Figure 3 This is a schematic diagram of the column positioning mechanism of this utility model.

[0025] Figure 4 This is a schematic diagram of the column clamping mechanism of this utility model.

[0026] Figure 5 This is a schematic diagram of the first clamping mechanism of this utility model.

[0027] Figure 6 This is a schematic diagram of the top crossbeam fixing device of this utility model.

[0028] Figure 7 This is a schematic diagram of the inclined short beam positioning device of this utility model.

[0029] Figure 8 This is a schematic diagram of the inclined short beam fixing device of this utility model.

[0030] Figure 9 This is a schematic diagram of the front column fixing device of this utility model.

[0031] Figure 10 This is a schematic diagram of the skeleton structure of a minibus.

[0032] In the diagram: 1. Welding platform, 2. Column positioning mechanism, 3. Column positioning base, 4. Push clamp base, 5. Push clamp, 6. Column clamping mechanism, 7. Bottom conformal pad, 8. First quick clamp, 9. Top crossbeam fixing device, 10. Second quick clamp, 11. Bottom support base, 12. Side limiting base, 13. Top limiting block, 14. Side limiting block, 15. First tightening mechanism, 16. Second tightening mechanism, 17. Tightening mechanism base, 18. Screw sleeve, 19. Screw, 20. Rotating handle, 21. Tightening block, 22. Rear column fixing device, 23. Third tightening mechanism, 24. Fourth tightening mechanism, 25. Inclined short beam positioning device, 26. Inclined short beam fixing device, 2 7. Telescopic cylinder; 28. Cylinder connecting block; 29. ​​Positioning pin; 30. Third quick clamp; 31. Inclined short beam support base; 32. Inclined short beam clamping block; 33. Front column fixing device; 34. Fourth quick clamp; 35. Front column support base; 36. Front column clamping block; 37. Fifth clamping mechanism; 38. Front column limiting base; 39. Sixth clamping mechanism; 40. Seventh clamping mechanism; 41. Turning and shifting machine connecting plate; 42. First main column in the middle; 43. Second main column in the middle; 44. Top crossbeam; 45. Middle crossbeam; 46. Front frame; 47. Rear frame; 48. Lower frame; 49. Rear column; 50. Front column; 51. Inclined short beam. Detailed Implementation

[0033] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0034] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] like Figures 1 to 9 As shown, a welding fixture for the side panel frame of a minibus is used to clamp and fix the side panel frame of a minibus. Figure 10 The diagram shows a schematic of the frame structure of a minibus, including a central first main column 42, a central second main column 43, a top crossbeam 44, a central crossbeam 45, a front frame 46, a rear frame 47, and a lower frame 48. Both the first and second main columns are vertically oriented, with the first column positioned in front of the second column. Through holes are provided on the side surfaces of both the first and second columns. The top crossbeam 44 is located at the upper end of both the central first main column 42 and the central second main column 43. Both the first and second main columns are curved arc-shaped structures, and the central first main column 42, the central second main column 43, and the top crossbeam 44 are all square tubular structures. The central crossbeam 45 connects the first and second main columns. The front frame 46 is positioned in front of the first main column, with its rear end connected to the first main column and its upper end connected to the top crossbeam 44. The rear frame 47 is located on the rear side of the second main column, with its front end connected to the second main column and its upper end connected to the top crossbeam 44. The lower frame 48 is located on the lower side of the middle crossbeam 45.

[0036] Because the first and second main columns are curved arc structures, it is difficult to accurately position them during the fixing process. Secondly, due to the curvature of the two main columns, the upper and lower surfaces of the top beam 44 are not parallel to the horizontal plane, making it difficult for traditional tooling fixtures to clamp and fix them.

[0037] The welding fixture for the side frame of a minibus disclosed in this utility model includes a welding platform 1, a main column fixing system set on the welding platform 1 for fixing two sets of main columns, and a top beam fixing system for fixing the top beam 44.

[0038] The main column fixing system is provided in two sets to position the first column and the second column respectively, including a vertical positioning device, which includes a column clamping mechanism 6 and a column positioning mechanism 2.

[0039] The column positioning mechanism 2 includes a column positioning base 3, a pusher base 4, and a pusher 5. The column positioning base 3 is mounted on the welding platform 1. The pusher base 4 is mounted on the column positioning base 3, and the pusher 5 is mounted on the pusher base 4. The axial direction of the telescopic shaft of the pusher 5 is adjusted by the connection position between the pusher base 4 and the column positioning base 3, so that the axis of the telescopic shaft of the pusher 5 is aligned with the axis of the through hole opened on the bottom surface of the first / second column, allowing the telescopic shaft of the pusher 5 to be smoothly inserted into the through hole on the side surface of the first / second column. The column positioning mechanism 2 achieves preliminary positioning of the first and second columns.

[0040] The column clamping mechanism 6 includes a bottom conformal pad 7 and a first quick clamp 8. Both the conformal positioning block and the first quick clamp 8 are mounted on the welding platform 1. The upper surface of the bottom conformal pad 7 is adapted to the curvature of the first main column / second main column to support the first main column / second main column. The first quick clamp 8 is located on one side of the bottom conformal pad 7, and the pressure head of the first quick clamp 8 is located above the bottom conformal pad 7. The first quick clamp 8 and the bottom conformal pad 7 cooperate to clamp the first main column / second main column vertically.

[0041] The top beam fixing system includes a top beam fixing device 9, which comprises a second quick clamp 10 mounted on the welding platform 1, a bottom support base 11, and a side limiting base 12. The upper surface of the bottom support base 11 is inclined and fits against the lower bottom wall of the top beam 44. The side surface of the side limiting base 12 is provided with a protruding limiting block, the side surface of which is inclined and fits against the side wall of the top beam 44. The clamping arm of the second clamp is provided with a top limiting block 13 and a side limiting block 14. The lower surface of the top limiting block 13 is inclined and fits against the upper top wall of the top beam 44; the side surface of the side limiting block 14 is inclined and fits against the side wall of the top beam 44. The bottom support base 11 and the side limiting base 12 are used to support the top crossbeam 44. The second quick clamp 10 is used to cooperate with the bottom support base 11 and the side limiting base 12 to clamp the top crossbeam 44, so that the side surface of the top crossbeam 44 can be tilted and can fit with the end positions of the first main column and the second main column to achieve fixation before welding.

[0042] Preferably, at least two sets of the bottom conformal pad 7 and the first quick clamp 8 are provided along the length direction of the first column / second column.

[0043] Preferably, at least two sets of the second quick clamp 10, the bottom support base 11, and the side limiting base 12 are provided along the length direction of the top crossbeam 44.

[0044] As a preferred technical solution of this utility model, the top beam fixing system further includes a first tightening mechanism 15 and a second tightening mechanism 16 disposed on the welding platform 1. The first tightening mechanism 15 and the second tightening mechanism 16 have the same structure. The first tightening mechanism 15 is located on the side of the top beam 44 away from the first column, and the second tightening mechanism 16 is located on the side of the top beam 44 close to the first column. Both the first tightening mechanism 15 and the second tightening mechanism 16 include a tightening mechanism base 17, a screw sleeve 18, a screw 19, a rotating handle 20, and a tightening block 21.

[0045] The screw sleeve 18 is located at the top of the base 17 of the tightening mechanism. The axial direction of the screw sleeve 18 is perpendicular to the side surface of the top crossbeam 44. The middle part of the screw 19 is screwed into the screw sleeve 18. One end of the screw 19 is provided with a tightening block 21, and the other end of the screw 19 is provided with a rotating handle 20. By rotating the screw 19 through the rotating handle 20, the tightening block 21 moves toward the top crossbeam 44 until the tightening block 21 is in contact with the side surface of the top crossbeam 44. The first tightening mechanism 15 and the second tightening mechanism 16 together clamp the top crossbeam 44.

[0046] Preferably, the end of the screw 19 connected to the clamping block 21 is a ball head structure. The clamping block 21 is provided with a spherical groove that matches the ball head on the screw 19. The ball head of the screw 19 is located in the spherical groove of the clamping block 21, realizing a rotatable connection between the screw 19 and the clamping block 21. When there is a dimensional deviation in the axial direction of the bushing, or when clamping the top crossbeam 44 of the side frame of different models of minibuses, the clamping block 21 can be adjusted adaptively to ensure that the clamping block 21 can completely fit the side surface of the top crossbeam 44.

[0047] The rear frame 47 of the minibus side frame includes a rear end column 49, one end of which is connected to the top crossbeam 44. Since the first and second columns are arc-shaped, the rear end column 49, adapted to the overall shape of the frame, is not arc-shaped like the first and second columns, but is tilted so that its side surface is not parallel to the plane of the welding platform 1. To achieve positioning of the rear end column 49, a preferred embodiment of this invention includes a rear end column fixing system. This system includes a rear end column fixing device 22, which has the same structure as the top crossbeam fixing device 9. The upper surface of the bottom support base 11 of the rear end column fixing device 22 is inclined and fits against the lower bottom wall of the rear end column 49. The side surface of the side limiting base 12 of the rear end column fixing device 22 is provided with a protruding limiting block, the side surface of which fits against the side wall of the rear end column 49. The lower end face of the top limiting block 13 of the rear column fixing device 22 is in contact with the upper top wall of the rear column 49; the side surface of the side limiting block 14 of the rear column fixing device 22 is in contact with the side wall of the rear column 49. The rear column 49 is fixed before welding by the top crossbeam fixing device 9.

[0048] Preferably, at least two sets of the rear column fixing device 22 are provided along the length direction of the rear column 49.

[0049] Preferably, the rear column fixing system further includes a third tightening mechanism 23 and a fourth tightening mechanism 24. The third tightening mechanism 23 and the fourth tightening mechanism 24 have the same structure as the first tightening mechanism 15. The third tightening mechanism 23 is located on the rear side of the rear column 49, and the fourth tightening mechanism 24 is located on the front side of the rear column 49. The third tightening mechanism 23 and the fourth tightening mechanism 24 further position the rear column 49.

[0050] The lower end of the rear column 49 of the minibus side frame is also provided with a diagonal short beam 51. One end of the diagonal short beam 51 is connected to the rear column 49. The diagonal short beam 51 is set at an angle relative to the rear column 49, and the diagonal short beam 51 is provided with through holes. In order to fix the diagonal short beam 51, as a preferred technical solution of this utility model, it also includes a diagonal short beam positioning device 25 and a diagonal short beam fixing device 26.

[0051] The inclined short beam positioning device 25 includes a telescopic cylinder 27, a cylinder connecting block 28, and a positioning pin 29. The telescopic cylinder 27 is mounted on the welding platform 1, the cylinder connecting block 28 is mounted on the end of the piston rod of the telescopic cylinder 27, and the positioning pin 29 is mounted on the cylinder connecting block 28. The telescopic cylinder 27 drives the positioning pin 29 to pass into the through hole on the inclined short beam 51, thereby achieving the initial positioning of the inclined short beam 51.

[0052] The inclined short beam fixing device 26, the third quick clamp 30, and the inclined short beam support base 31 are all connected. The clamping arm of the third quick clamp 30 is equipped with an inclined short beam clamping block 32, the lower end surface of which is inclined so that it fits against the upper end surface of the inclined short beam 51. The inclined short beam support base 31 is located below the inclined short beam 51, and its upper end is also inclined so that it fits against the lower end surface of the inclined short beam 51. The inclined short beam 51 is vertically clamped by the third quick clamp 30 in conjunction with the inclined short beam support base 31.

[0053] The front-end frame includes a front-end column 50 located at the front end of the front-end frame. One end of the front-end column 50 is connected to the top crossbeam 44. The front-end column 50, like the rear-end column 49, is inclined. To achieve positioning of the rear-end column 49, as a preferred embodiment of this invention, a front-end column fixing system is also included, comprising a front-end column fixing device 33.

[0054] The front column fixing device 33 includes a fourth quick clamp 34 and a front column support base 35. The clamping arm of the fourth quick clamp 34 is equipped with a front column clamping block 36, the lower end surface of which is inclined, allowing it to fit against the upper end surface of the front column 50. The front column support base 35 is located below the front column 50, and its upper end is also inclined, allowing it to fit against the lower end surface of the front column 50. The fourth quick clamp 34, in conjunction with the front column support base 35, clamps the front column 50 vertically.

[0055] Preferably, the front column fixing system further includes a fifth tightening mechanism 37 and a front column limiting base 38. The front column limiting base 38 is disposed on one side of the front column 50, and the fifth tightening mechanism 37 is disposed on the other side of the front column 50. The front column limiting base 38 is provided with a tightening protrusion extending toward the front column 50. The fifth tightening mechanism 37 has the same structure as the first tightening mechanism. The front column 50 is further positioned by the cooperation of the front column limiting base 38 and the fifth tightening mechanism 37.

[0056] As a preferred embodiment of this utility model, it further includes a sixth tightening mechanism 39 and a seventh tightening mechanism 40. Both the sixth tightening mechanism 39 and the seventh tightening mechanism 40 have the same structure as the first tightening mechanism 15. The sixth tightening mechanism 39 is located on the side of the first column away from the front end frame and is used to apply a thrust to the first column towards the front end frame. The seventh tightening mechanism 40 is located on the side of the second column away from the rear end frame and is used to apply a thrust to the second column towards the rear end frame. The arrangement of the sixth tightening mechanism 39 and the seventh tightening mechanism 40 achieves overall structural stability of the minibus frame.

[0057] As a preferred technical solution of this utility model, it also includes a flipping and positioning machine connecting plate 41. The flipping and positioning machine connecting plate 41 is disposed at the end of the welding platform 1 and is connected to the flipping and positioning machine through the flipping and positioning machine connecting plate 41 to realize the overall 180° flipping of the tooling. For the position on the back of the minibus side frame that needs to be welded, a processing through hole is opened at the corresponding position of the welding platform 1. The flipping and positioning machine is used to drive the welding tooling to flip, and then the welding torch passes through the processing through hole on the welding platform 1 to further weld the back of the minibus side frame.

[0058] The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be included within the protection scope of the present invention.

Claims

1. A welding fixture for the side frame of a minibus, characterized in that, Includes a welding platform (1), and a main column fixing system and a top beam fixing system installed on the welding platform (1). The main column fixing system is used to fix two sets of main columns on the side frame of the minibus. The main column fixing system is provided in two sets, including a vertical positioning device. The vertical positioning device includes a column clamping mechanism (6) and a column positioning mechanism (2). The column positioning mechanism (2) includes a column positioning base (3), a push clamp base (4), and a push clamp (5). The push clamp (5) is set on the column positioning base (3) through the push clamp base (4). The axis of the extension shaft of the push clamp (5) is on the same straight line as the axis of the through hole opened on the bottom surface of the first column / second column. The column clamping mechanism (6) includes a bottom conformal pad (7) and a first quick clamp (8). The upper surface of the bottom conformal pad (7) is adapted to the lower surface of the first main column / second main column, so that the upper surface of the bottom conformal pad (7) can fit against the lower surface of the first main column / second main column. The first quick clamp (8) is located on one side of the bottom conformal pad (7), and the pressure head of the first quick clamp (8) is located above the bottom conformal pad (7). The first quick clamp (8) and the bottom conformal pad (7) cooperate to clamp the first main column / second main column in the vertical direction. The top crossbeam fixing system is used to fix the top crossbeam (44) on the side frame of the minibus, including a top crossbeam fixing device (9). The top crossbeam fixing device (9) includes a second quick clamp (10), a bottom support base (11), and a side limiting base (12). The upper surface of the bottom support base (11) is an inclined surface that fits against the lower bottom wall of the top crossbeam (44). The side limiting base (12) has a protruding limiting block on its side surface, and its side surface is an inclined surface that fits against the side wall of the top crossbeam (44). The second clamp clamping arm has a... The top limiting block (13) and the side limiting block (14) are provided. The lower end surface of the top limiting block (13) is an inclined surface that fits against the top wall of the top beam (44). The side surface of the side limiting block (14) is an inclined surface that fits against the side wall of the top beam (44). The side limiting block (14) and the protruding limiting block of the side limiting base (12) are respectively set on both sides of the top beam (44). The top limiting block (13), the side limiting block (14) and the bottom support base (11) and the side limiting base (12) cooperate to clamp the top beam (44).

2. The welding fixture for the side frame of a minibus according to claim 1, characterized in that, The top beam fixing system also includes a first clamping mechanism (15) and a second clamping mechanism (16) set on the welding platform (1). The first clamping mechanism (15) and the second clamping mechanism (16) have the same structure. The first clamping mechanism (15) is located on the side of the top beam (44) away from the first column, and the second clamping mechanism (16) is located on the side of the top beam (44) close to the first column. Both the first clamping mechanism (15) and the second clamping mechanism (16) include a clamping mechanism base (17), a screw sleeve (18), a screw rod (19), a rotating handle (20), and a clamping block (21). The screw sleeve (18) is located at the top of the base (17) of the tightening mechanism. The axial direction of the screw sleeve (18) is perpendicular to the side surface of the top crossbeam (44). The middle part of the screw (19) is screwed into the screw sleeve (18). One end of the screw (19) is provided with a tightening block (21), and the other end of the screw (19) is provided with a rotating handle (20). Rotating the screw (19) by rotating the handle (20) can make the tightening block (21) move toward the top crossbeam (44) so ​​that the tightening block (21) fits against the side surface of the top crossbeam (44). The first tightening mechanism (15) and the second tightening mechanism (16) together clamp the top crossbeam (44).

3. The welding fixture for the side frame of a minibus according to claim 2, characterized in that, The end of the screw (19) connected to the clamping block (21) is a ball head structure. The clamping block (21) is provided with a spherical groove that matches the ball head on the screw (19). The ball head of the screw (19) is located in the spherical groove of the clamping block (21), thereby realizing a rotatable connection between the screw (19) and the clamping block (21).

4. The welding fixture for the side frame of a minibus according to claim 2, characterized in that, It also includes a rear column fixing system, which includes a rear column fixing device (22). The rear column fixing device (22) has the same structure as the top beam fixing device (9). The upper surface of the bottom support base (11) of the rear column fixing device (22) is in contact with the lower bottom wall of the rear column (49); the side surface of the protruding limiting block of the rear column fixing device (22) is in contact with the side wall of the rear column (49); the lower surface of the top limiting block (13) of the rear column fixing device (22) is in contact with the upper top wall of the rear column (49); the side surface of the side limiting block (14) of the rear column fixing device (22) is in contact with the side wall of the rear column (49), and the protruding limiting block and the side limiting block (14) of the rear column fixing device (22) are respectively arranged on both sides of the rear column (49).

5. The welding fixture for the side frame of a minibus according to claim 4, characterized in that, The rear column fixing system also includes a third clamping mechanism (23) and a fourth clamping mechanism (24). The third clamping mechanism (23) and the fourth clamping mechanism (24) have the same structure as the first clamping mechanism (15). The third clamping mechanism (23) is located on the rear side of the rear column (49), and the fourth clamping mechanism (24) is located on the front side of the rear column (49). The third clamping mechanism (23) and the fourth clamping mechanism (24) together clamp the rear column (49).

6. The welding fixture for the side frame of a minibus according to claim 4, characterized in that, The rear column fixing system also includes a diagonal short beam positioning device (25) and a diagonal short beam fixing device (26). The inclined short beam positioning device (25) includes a telescopic cylinder (27), a cylinder connecting block (28), and a positioning pin (29). The telescopic cylinder (27) is set on the welding platform (1), the cylinder connecting block (28) is set at the end of the piston rod of the telescopic cylinder (27), and the positioning pin (29) is set on the cylinder connecting block (28). The telescopic cylinder (27) drives the positioning pin (29) to pass into the through hole on the inclined short beam (51). The inclined short beam fixing device (26) is connected to the third quick clamp (30) and the inclined short beam support base (31). The clamping arm of the third quick clamp (30) is provided with an inclined short beam clamping block (32). The lower end surface of the inclined short beam clamping block (32) is an inclined surface that fits against the upper end surface of the inclined short beam (51). The inclined short beam support base (31) is located below the inclined short beam (51), and its upper end is an inclined surface that fits against the lower end surface of the inclined short beam (51).

7. The welding fixture for the side frame of a minibus according to claim 2, characterized in that, It also includes a front column fixing system, which includes a front column fixing device (33). The front column fixing device (33) includes a fourth quick clamp (34) and a front column support base (35). The clamping arm of the fourth quick clamp (34) is provided with a front column clamping block (36). The lower end surface of the front column clamping block (36) is an inclined surface that fits against the upper end surface of the front column (50). The front column support base (35) is located below the front column (50), and its upper end is an inclined surface that fits against the lower end surface of the front column (50). The front column clamping block (36) and the front column support base (35) cooperate to clamp the front column (50) in the vertical direction.

8. The welding fixture for the side frame of a minibus according to claim 7, characterized in that, The front column fixing system also includes a fifth clamping mechanism (37) and a front column limiting base (38). The front column limiting base (38) is located on one side of the front column (50), and the fifth clamping mechanism (37) is located on the other side of the front column (50). The front column limiting base (38) is provided with clamping protrusions extending toward the front column (50). The fifth clamping mechanism (37) has the same structure as the first clamping mechanism (15). The front column limiting base (38) and the fifth clamping mechanism (37) cooperate to clamp the front column (50).

9. The welding fixture for the side frame of a minibus according to claim 2, characterized in that, It also includes a sixth tightening mechanism (39) and a seventh tightening mechanism (40). The sixth tightening mechanism (39) and the seventh tightening mechanism (40) have the same structure as the first tightening mechanism (15). The sixth tightening mechanism (39) is located on the side of the first column away from the front frame (46) and is used to apply a thrust to the first column in the direction of the front frame (46). The seventh tightening mechanism (40) is located on the side of the second column away from the rear frame (47) and is used to apply a thrust to the second column in the direction of the rear frame (47).

10. The welding fixture for the side frame of a minibus according to claim 1, characterized in that, It also includes a flip-shifting positioner connecting plate (41) and a flip-shifting positioner. The flip-shifting positioner connecting plate (41) is located at the end of the welding platform (1) and is connected to the flip-shifting positioner. The welding platform (1) has a machining through hole.

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