Positioning and clamping device for welding of automobile frame

Abstract

The invention discloses an automobile frame welding, positioning and clamping device, and relates to the technical field of positioning and clamping devices.The automobile frame welding, positioning and clamping device comprises a base, a plurality of supporting columns are fixedly mounted at the upper end of the base, an adjusting mechanism is arranged at the upper ends of the supporting columns, and a pushing mechanism is arranged at the upper end of the adjusting mechanism; four groups of clamping mechanisms are arranged at the upper end of the pushing mechanism, and the structures of the four groups of clamping mechanisms are the same; the adjusting mechanism comprises two sets of moving plates and two sets of base plates, stepping motors are fixedly installed at the lower ends of the two sets of moving plates, and oval long holes are formed in the upper ends of the two sets of moving plates in a penetrating mode. According to the automatic welding device, the positions of frame structures of different vehicle types can be flexibly adjusted so as to meet the welding requirements of new vehicle types, the whole welding equipment and clamps do not need to be adjusted or replaced again, the production preparation time is shortened, and the production flexibility and the response speed can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of positioning clamping devices, in particular to a positioning clamping device for welding an automobile frame. Background Art

[0002] Automobile frame welding is a key process in automobile manufacturing. With the development of automobile manufacturing technology and the advancement of welding technology, the requirements for precise control and flexible adjustment of welding positions are becoming increasingly higher. In modern welding, programming and navigation algorithms can be used to enable welding robots to move accurately along a preset path, so that they can move accurately to the welding position, which is convenient for positioning welding of automobile frames.

[0003] In the prior art, the mechanical structure of traditional welding equipment is relatively simple and lacks a flexible adjustment mechanism. In the production process of multiple types of automobile frames, different models have different frame structures and welding position requirements. If the welding position cannot be flexibly adjusted, when switching production models, it will not be able to adapt to the welding requirements of the new models. The entire welding equipment and fixtures need to be readjusted or replaced, which will greatly increase production preparation time and reduce production flexibility and response speed. Summary of the invention

[0004] The object of the present invention is to provide a welding positioning clamping device for an automobile frame to solve the problems raised by the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: a welding positioning clamping device for an automobile frame, comprising a base, a plurality of groups of support columns are fixedly mounted on the upper end of the base, an adjusting mechanism is arranged on the upper end of the plurality of support columns, a pushing mechanism is arranged on the upper end of the adjusting mechanism, four groups of clamping mechanisms are arranged on the upper end of the pushing mechanism, and the structures of the four groups of clamping mechanisms are the same; The adjusting mechanism comprises two groups of moving plates and two groups of pads, the lower ends of the two groups of moving plates are fixedly mounted with stepper motors, the upper ends of the two groups of moving plates are penetrated with elliptical long holes, the upper ends of the two groups of moving plates are fixedly mounted with two groups of guide rails, the outer walls of the four groups of guide rails are slidably mounted with three groups of sliding seats, the lower ends of the two groups of moving plates are fixedly mounted with guide seats, the interiors of the two groups of guide seats are rotatably mounted with screws, the interiors of the two groups of guide seats are slidably mounted with threaded seats, the interiors of the two groups of guide seats are slidably mounted with special-shaped plates, the lower ends of the two groups of threaded seats are fixedly mounted with special-shaped connecting plates, and at the same time, the two groups of stepper motors are started synchronously, the output ends of the two groups of stepper motors drive the two groups of screws to rotate inside the two groups of guide seats respectively, and at the same time, the two groups of guide seats rotate on the internal threads of the two groups of threaded seats. Since the two groups of threaded seats are slidably installed inside the two groups of guide seats, the two groups of threaded seats move left and right on the outer walls of the two groups of screws respectively, and the two groups of threaded seats slide inside the two groups of guide seats respectively. The two groups of guide seats drive the two groups of special-shaped plates to move left and right together through the two groups of special-shaped connecting plates, and the two groups of special-shaped plates slide inside the two groups of elliptical long holes respectively. At the same time, the two groups of special-shaped plates drive the two groups of pads to move, and the two groups of pads drive several groups of sliding seats to slide on the outer walls of the four groups of guide rails respectively, and then the two groups of pushing mechanisms can be driven to move left and right together through the four groups of connecting plates, so that the position of the frame structure of different models can be flexibly adjusted to meet the welding requirements of new models, without the need to readjust or replace the entire welding equipment and fixture, which not only reduces the production preparation time, but also improves the production flexibility and response speed.

[0006] Preferably, the pushing mechanism includes four groups of connecting plates and four groups of vertical plates, diagonal support plates are fixedly installed on both sides of the four groups of vertical plates, double-axis double-rod cylinders are fixedly installed on the upper ends of the four groups of connecting plates, and long slides are arranged on the upper ends of the four groups of double-axis double-rod cylinders, wherein the four groups of double-axis double-rod cylinders are started synchronously, the telescopic ends of the four groups of double-axis double-rod cylinders push the four groups of long plates, the four groups of long plates drive the four groups of long slides to slide on the outer walls of the four groups of guide blocks, and at the same time, the four groups of long slides drive the eight groups of diagonal support plates and the four groups of vertical plates to move, the four groups of vertical plates drive the four groups of clamping mechanisms to move through the four groups of concave plates, and then the positions of the four groups of clamping mechanisms can be adjusted, thereby facilitating the four groups of clamping mechanisms to clamp the frame structures of different models, thereby improving the practicability of the device.

[0007] Preferably, the lower ends of the two groups of movable plates are respectively fixed to the upper ends of several groups of support columns, and one end of the two groups of screw rods respectively passes through one end of the two groups of guide seats and are respectively fixed to the output ends of the two groups of stepper motors.

[0008] Preferably, the two groups of threaded seats are respectively connected to the two groups of screw threads, the upper ends of the two groups of special-shaped plates are respectively fixed to the lower ends of the two groups of movable plates, the protrusions of the two groups of special-shaped connecting plates are respectively fixed to one side of the two groups of special-shaped plates, and the upper ends of several groups of sliding seats are respectively fixed to the lower ends of the two groups of pads.

[0009] Preferably, the clamping mechanism includes a concave plate and two groups of trapezoidal plates, one end of the two groups of trapezoidal plates are fixedly installed with a limit block, and the inner side wall of the concave plate is fixedly installed with two groups of three-axis cylinders, wherein by synchronously starting eight groups of three-axis cylinders, the protruding ends of the eight groups of three-axis cylinders drive the eight groups of trapezoidal plates to move through eight groups of push plates, and the eight groups of trapezoidal plates drive the limit blocks and two groups of oblique blocks fixed thereto to move until the surfaces of the eight groups of trapezoidal plates contact the surface of the frame, thereby fixing the frame.

[0010] Preferably, guide blocks are fixedly mounted on the upper ends of the four groups of double-axis double-rod cylinders, and long plates are fixedly mounted on the lower ends of the four groups of long slides.

[0011] Preferably, one side of the eight groups of diagonal support plates are respectively fixed to the two sides of the four groups of long slides, and the lower ends of the four groups of connecting plates are respectively fixed to the upper ends of the two groups of pads, wherein, by slidingly installing several groups of sliding seats on the outer walls of the four groups of guide rails, when the two groups of pads move, the two groups of pads will drive several groups of sliding seats to slide on the outer walls of the four groups of guide rails, respectively, which can guide the two groups of pads and increase the stability of the two groups of pads when moving.

[0012] Preferably, two groups of inclined stops are fixedly installed at one end of the two groups of trapezoidal plates, and push plates are fixedly installed at the protruding ends of the two groups of three-axis cylinders, wherein the cooperation of several groups of inclined stops and eight groups of limit blocks can limit the position of the frame, facilitate the fixation of the frame, and prevent the frame from moving on the trapezoidal plates.

[0013] Preferably, one end of the four groups of concave plates is respectively fixed to the other end of the four groups of vertical plates, and the other end of the two groups of push plates is respectively fixed to one end of the two groups of trapezoidal plates.

[0014] Preferably, one side of the two groups of vertical plates are respectively fixed to one side of the four groups of long slides, and the four groups of long slides are respectively slidably installed on the outer walls of the four groups of guide blocks, wherein, by respectively slidably installing the four groups of long slides on the outer walls of the four groups of guide blocks, when the four groups of long plates move, the four groups of long plates will drive the four groups of long slides to slide on the outer walls of the four groups of guide blocks, thereby increasing the stability of the four groups of long slides when driving the four groups of vertical plates to move.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, by providing an adjustment mechanism, the two groups of pushing mechanisms can be driven to move left and right together through four groups of connecting plates, so that the position of the frame structure of different models can be flexibly adjusted to meet the welding requirements of new models, without the need to readjust or replace the entire welding equipment and fixtures, which not only reduces the production preparation time, but also improves the flexibility and response speed of production.

[0016] 2. In the present invention, by providing a pushing mechanism, the four groups of vertical plates drive the four groups of clamping mechanisms to move through the four groups of concave plates, and then the positions of the four groups of clamping mechanisms can be adjusted, so that the four groups of clamping mechanisms can clamp the frame structures of different vehicle models, thereby improving the practicality of the device.

[0017] 3. In the present invention, by providing a clamping mechanism, eight groups of three-axis cylinders are started synchronously, and the extended ends of the eight groups of three-axis cylinders drive the eight groups of trapezoidal plates to move through eight groups of push plates, and the eight groups of trapezoidal plates drive the limit blocks and two groups of inclined blocks fixed thereto to move until the surfaces of the eight groups of trapezoidal plates contact the surface of the frame, thereby fixing the frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A stereoscopic diagram of a welding positioning clamping device for an automobile frame according to the present invention; Figure 2 It is a partial three-dimensional diagram of a welding positioning clamping device for an automobile frame of the present invention; Figure 3 A bottom view of an adjusting mechanism in a welding positioning clamping device for an automobile frame of the present invention; Figure 4 It is a partial bottom view of an adjusting mechanism in a welding positioning clamping device for an automobile frame of the present invention; Figure 5 It is a structural schematic diagram of a pushing mechanism and a clamping mechanism in a welding positioning clamping device for an automobile frame of the present invention; Figure 6 It is a schematic diagram of the partial exploded structure of a pushing mechanism in a welding positioning clamping device for an automobile frame of the present invention; Figure 7 The present invention is a schematic structural diagram of a clamping mechanism in a welding positioning clamping device for an automobile frame.

[0019] In the figure: 1. Base; 11. Support column; 2. Adjustment mechanism; 21. Moving plate; 22. Stepper motor; 23. Pad; 24. Elliptical long hole; 25. Guide rail; 26. Sliding seat; 27. Guide seat; 28. Screw; 29. ​​Threaded seat; 210. Special-shaped plate; 211. Special-shaped connecting plate; 3. Pushing mechanism; 31. Connecting plate; 32. Vertical plate; 33. Diagonal support plate; 34. Double-axis double-rod cylinder; 35. Long slide seat; 36. Guide block; 37. Long plate; 4. Clamping mechanism; 41. Concave plate; 42. Trapezoidal plate; 43. Limit block; 44. Three-axis cylinder; 45. Oblique stopper; 46. Push plate. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Example 1: Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown: a welding positioning clamping device for an automobile frame, comprising a base 1, a plurality of groups of support columns 11 are fixedly mounted on the upper end of the base 1, an adjusting mechanism 2 is arranged on the upper end of the plurality of support columns 11, a pushing mechanism 3 is arranged on the upper end of the adjusting mechanism 2, four groups of clamping mechanisms 4 are arranged on the upper end of the pushing mechanism 3, and the structures of the four groups of clamping mechanisms 4 are the same; The adjustment mechanism 2 includes two groups of moving plates 21 and two groups of pads 23. The lower ends of the two groups of moving plates 21 are fixedly installed with stepping motors 22. The upper ends of the two groups of moving plates 21 are penetrated with elliptical long holes 24. The upper ends of the two groups of moving plates 21 are fixedly installed with two groups of guide rails 25. The outer walls of the four groups of guide rails 25 are slidably installed with three groups of sliding seats 26. The lower ends of the two groups of moving plates 21 are fixedly installed with guide seats 27. The interiors of the two groups of guide seats 27 are rotatably installed with screws 28. The interiors of the two groups of guide seats 27 are slidably installed with threaded seats 29. The interiors of the two groups of elliptical long holes 24 are slidably installed with special-shaped plates 210. The lower ends of the two groups of threaded seats 29 are fixedly installed with special-shaped connecting plates 211, the lower ends of the two groups of movable plates 21 are respectively fixed to the upper ends of several groups of support columns 11, one end of the two groups of screw rods 28 respectively passes through one end of the two groups of guide seats 27, and are respectively fixed to the output ends of the two groups of stepper motors 22, the two groups of threaded seats 29 are respectively threadedly connected to the two groups of screw rods 28, the upper ends of the two groups of special-shaped plates 210 are respectively fixed to the lower ends of the two groups of movable plates 21, the protruding parts of the two groups of special-shaped connecting plates 211 are respectively fixed to one side of the two groups of special-shaped plates 210, and the upper ends of several groups of sliding seats 26 are respectively fixed to the lower ends of the two groups of pads 23.

[0022] In this embodiment, by synchronously starting the two sets of stepper motors 22, the output ends of the two sets of stepper motors 22 drive the two sets of screw rods 28 to rotate inside the two sets of guide seats 27 respectively, and at the same time, the two sets of guide seats 27 rotate on the internal threads of the two sets of threaded seats 29. Since the two sets of threaded seats 29 are slidably installed inside the two sets of guide seats 27, the two sets of threaded seats 29 move left and right on the outer walls of the two sets of screw rods 28 respectively, and the two sets of threaded seats 29 slide inside the two sets of guide seats 27 respectively. The two sets of guide seats 27 drive the two sets of special-shaped plates 210 to move left and right together through the two sets of special-shaped connecting plates 211. The two groups of special-shaped plates 210 slide inside the two groups of elliptical long holes 24 respectively, and at the same time, the two groups of special-shaped plates 210 drive the two groups of pads 23 to move, and the two groups of pads 23 drive several groups of sliding seats 26 to slide on the outer walls of the four groups of guide rails 25 respectively, and then the two groups of pushing mechanisms 3 can be driven to move left and right together through the four groups of connecting plates 31, so that the position of the frame structure of different models can be flexibly adjusted to meet the welding requirements of new models, without the need to readjust or replace the entire welding equipment and fixtures, which not only reduces the production preparation time, but also improves the flexibility and response speed of production; By slidingly installing several groups of sliding seats 26 on the outer walls of the four groups of guide rails 25, when the two groups of pads 23 move, the two groups of pads 23 will drive several groups of sliding seats 26 to slide on the outer walls of the four groups of guide rails 25 respectively, which can guide the two groups of pads 23 and increase the stability of the two groups of pads 23 when moving.

[0023] Embodiment 2: Figure 1 , Figure 2, Figure 5 and Figure 6 As shown, the pushing mechanism 3 includes four groups of connecting plates 31 and four groups of vertical plates 32, both sides of the four groups of vertical plates 32 are fixedly installed with diagonal support plates 33, the upper ends of the four groups of connecting plates 31 are fixedly installed with double-axis double-rod cylinders 34, the upper ends of the four groups of double-axis double-rod cylinders 34 are provided with long slides 35, the upper ends of the four groups of double-axis double-rod cylinders 34 are fixedly installed with guide blocks 36, the lower ends of the four groups of long slides 35 are fixedly installed with long plates 37, one side of the eight groups of diagonal support plates 33 are respectively fixed to the two sides of the four groups of long slides 35, the lower ends of the four groups of connecting plates 31 are respectively fixed to the upper ends of the two groups of pads 23, one end of the four groups of concave plates 41 are respectively fixed to the other ends of the four groups of vertical plates 32, and the other ends of the two groups of push plates 46 are respectively fixed to one end of the two groups of trapezoidal plates 42.

[0024] In this embodiment, by synchronously starting four groups of double-axis double-rod cylinders 34, the telescopic ends of the four groups of double-axis double-rod cylinders 34 push the four groups of long plates 37, and the four groups of long plates 37 drive the four groups of long slides 35 to slide on the outer walls of the four groups of guide blocks 36. At the same time, the four groups of long slides 35 drive the eight groups of diagonal support plates 33 and the four groups of vertical plates 32 to move, and the four groups of vertical plates 32 drive the four groups of clamping mechanisms 4 to move through the four groups of concave plates 41, so that the positions of the four groups of clamping mechanisms 4 can be adjusted, so that the four groups of clamping mechanisms 4 can clamp the frame structures of different models, thereby improving the practicality of the device; By slidably mounting the four groups of long slides 35 on the outer walls of the four groups of guide blocks 36 respectively, when the four groups of long boards 37 move, the four groups of long boards 37 will drive the four groups of long slides 35 to slide on the outer walls of the four groups of guide blocks 36, so as to increase the stability when the four groups of long slides 35 drive the four groups of vertical boards 32 to move; By welding one end of the eight groups of diagonal support plates 33 to one side of the four groups of vertical plates 32 respectively, and fixing one side of the eight groups of diagonal support plates 33 to both sides of the four groups of long slides 35 respectively, the eight groups of diagonal support plates 33 can support the four groups of vertical plates 32, thereby increasing the stability and firmness of the vertical plates 32.

[0025] Embodiment 3: Figure 1 , Figure 2 , Figure 5 and Figure 7 As shown, the clamping mechanism 4 includes a concave plate 41 and two groups of trapezoidal plates 42, one end of the two groups of trapezoidal plates 42 are fixedly installed with a limit block 43, the inner side wall of the concave plate 41 is fixedly installed with two groups of three-axis cylinders 44, one end of the two groups of trapezoidal plates 42 are fixedly installed with two groups of inclined stoppers 45, the protruding ends of the two groups of three-axis cylinders 44 are fixedly installed with push plates 46, one side of the two groups of vertical plates 32 are respectively fixed to one side of the four groups of long slides 35, and the four groups of long slides 35 are respectively slidably installed on the outer walls of the four groups of guide blocks 36.

[0026] In this embodiment, by synchronously starting eight groups of three-axis cylinders 44, the extended ends of the eight groups of three-axis cylinders 44 drive the eight groups of trapezoidal plates 42 to move through eight groups of push plates 46, and the eight groups of trapezoidal plates 42 drive the limit blocks 43 and two groups of oblique blocks 45 fixed thereto to move until the surfaces of the eight groups of trapezoidal plates 42 contact the surface of the frame, thereby fixing the frame; The cooperation of the plurality of groups of oblique stoppers 45 and the eight groups of limiting blocks 43 can limit the position of the frame, thereby facilitating the fixing of the frame and preventing the frame from moving on the trapezoidal plate 42 .

[0027] The working principle of the present invention is as follows: when in use, first, the device is installed at the welding equipment, and then the frame is moved to the top of the base 1, and then the four groups of double-axis double-rod cylinders 34 are synchronously started, and the telescopic ends of the four groups of double-axis double-rod cylinders 34 push the four groups of long plates 37, and the four groups of long plates 37 drive the four groups of long slides 35 to slide on the outer walls of the four groups of guide blocks 36. At the same time, the four groups of long slides 35 drive the eight groups of diagonal support plates 33 and the four groups of vertical plates 32 to move, and the four groups of vertical plates 32 drive the four groups of clamping mechanisms 4 to move through the four groups of concave plates 41, so that the positions of the four groups of clamping mechanisms 4 can be adjusted, and then, the eight groups of three-axis cylinders 44 are synchronously started, and the protruding ends of the eight groups of three-axis cylinders 44 drive the eight groups of trapezoidal plates 42 to move through the eight groups of push plates 46, and the eight groups of trapezoidal plates 42 drive the limit blocks 43 and the two groups of oblique blocks 45 fixed thereto to move until the surfaces of the eight groups of trapezoidal plates 42 contact the surface of the frame, so that the frame can be fixed, and finally, synchronously The two groups of stepper motors 22 are started, and the output ends of the two groups of stepper motors 22 drive the two groups of screw rods 28 to rotate inside the two groups of guide seats 27 respectively. At the same time, the two groups of guide seats 27 rotate on the internal threads of the two groups of threaded seats 29. The two groups of threaded seats 29 move left and right on the outer walls of the two groups of screw rods 28 respectively, and the two groups of threaded seats 29 slide inside the two groups of guide seats 27 respectively. The two groups of guide seats 27 drive the two groups of special-shaped plates 210 to move left and right together through the two groups of special-shaped connecting plates 211, and the two groups of special-shaped plates 210 slide inside the two groups of elliptical long holes 24 respectively. At the same time, the two groups of special-shaped plates 210 drive the two groups of pads 23 to move, and the two groups of pads 23 drive several groups of sliding seats 26 to slide on the outer walls of the four groups of guide rails 25 respectively, and then the two groups of pushing mechanisms 3 can be driven to move left and right together through the four groups of connecting plates 31, so that the position of the frame structure of different models can be flexibly adjusted, so that the frame can be moved to a suitable position of the welding equipment conveniently.

[0028] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A vehicle frame welding positioning clamping device, comprising a base (1), characterized in that: A plurality of groups of support columns (11) are fixedly mounted on the upper end of the base (1), an adjustment mechanism (2) is arranged on the upper end of the plurality of groups of support columns (11), a pushing mechanism (3) is arranged on the upper end of the adjustment mechanism (2), and four groups of clamping mechanisms (4) are arranged on the upper end of the pushing mechanism (3), and the four groups of clamping mechanisms (4) have the same structure; The adjustment mechanism (2) comprises two groups of movable plates (21) and two groups of pads (23). The lower ends of the two groups of movable plates (21) are fixedly mounted with stepping motors (22). The upper ends of the two groups of movable plates (21) are penetrated with elliptical long holes (24). The upper ends of the two groups of movable plates (21) are fixedly mounted with two groups of guide rails (25). The outer walls of the four groups of guide rails (25) are slidably mounted with three groups of sliding seats (26). The lower ends of the two groups of movable plates (21) are fixedly mounted with guide seats (27). The interiors of the two groups of guide seats (27) are rotatably mounted with screw rods (28). The interiors of the two groups of guide seats (27) are slidably mounted with threaded seats (29). The interiors of the two groups of elliptical long holes (24) are slidably mounted with special-shaped plates (210). The lower ends of the two groups of threaded seats (29) are fixedly mounted with special-shaped connecting plates (211).

2. The automobile frame welding positioning clamping device according to claim 1, characterized in that: The pushing mechanism (3) comprises four groups of connecting plates (31) and four groups of vertical plates (32), diagonal support plates (33) are fixedly mounted on both sides of the four groups of vertical plates (32), double-axis double-rod cylinders (34) are fixedly mounted on the upper ends of the four groups of connecting plates (31), and long slide seats (35) are arranged on the upper ends of the four groups of double-axis double-rod cylinders (34).

3. The automobile frame welding positioning clamping device according to claim 1, characterized in that: The lower ends of the two groups of movable plates (21) are respectively fixed to the upper ends of the plurality of groups of support columns (11), and one end of the two groups of screw rods (28) passes through one end of the two groups of guide seats (27) and are respectively fixed to the output ends of the two groups of stepping motors (22).

4. The automobile frame welding positioning clamping device according to claim 1, characterized in that: The two groups of threaded seats (29) are respectively threadedly connected to the two groups of screw rods (28), the upper ends of the two groups of special-shaped plates (210) are respectively fixed to the lower ends of the two groups of movable plates (21), the protruding parts of the two groups of special-shaped connecting plates (211) are respectively fixed to one side of the two groups of special-shaped plates (210), and the upper ends of the plurality of groups of sliding seats (26) are respectively fixed to the lower ends of the two groups of pads (23).

5. The automobile frame welding positioning clamping device according to claim 2, characterized in that: The clamping mechanism (4) comprises a concave plate (41) and two groups of trapezoidal plates (42), one end of each of the two groups of trapezoidal plates (42) being fixedly mounted with a limit block (43), and the inner side wall of the concave plate (41) being fixedly mounted with two groups of three-axis cylinders (44).

6. The automobile frame welding positioning clamping device according to claim 2, characterized in that: The upper ends of the four groups of double-shaft double-rod cylinders (34) are all fixedly mounted with guide blocks (36), and the lower ends of the four groups of long slide seats (35) are all fixedly mounted with long plates (37).

7. The automobile frame welding positioning clamping device according to claim 6, characterized in that: One side of the eight groups of diagonal support plates (33) is respectively fixed to the two sides of the four groups of long slide seats (35), and the lower ends of the four groups of connecting plates (31) are respectively fixed to the upper ends of the two groups of pads (23).

8. The automobile frame welding positioning clamping device according to claim 5, characterized in that: Two groups of inclined stoppers (45) are fixedly mounted on one end of the two groups of trapezoidal plates (42), and push plates (46) are fixedly mounted on the extended ends of the two groups of three-axis cylinders (44).

9. The automobile frame welding positioning clamping device according to claim 8, characterized in that: One end of the four groups of concave plates (41) is respectively fixed to the other end of the four groups of vertical plates (32), and the other end of the two groups of push plates (46) is respectively fixed to one end of the two groups of trapezoidal plates (42).

10. The automobile frame welding positioning clamping device according to claim 7, characterized in that: One side of the two groups of vertical plates (32) is respectively fixed to one side of four groups of long slide seats (35), and the four groups of long slide seats (35) are respectively slidably mounted on the outer walls of the four groups of guide blocks (36).

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