Welding fixing device for metal structural part

Abstract

The invention belongs to the technical field of welding and fixing, and particularly discloses a welding and fixing device for a metal structural member, which comprises an angle change assembly, a self-locking rotary adjusting mechanism, an elastic pre-clamping mechanism and a double-piston pressure-equalizing locking mechanism, the self-locking rotary adjusting mechanism is arranged on the angle change assembly, and the elastic pre-clamping mechanism is arranged on the double-piston pressure-equalizing locking mechanism. The elastic pre-clamping mechanism is arranged on the angle changing assembly. Through cooperation of the fan-shaped notch and the limiting boss, the relative rotation angle of the angle adjusting handle and the rotating main shaft can be limited; through traction of the linkage rope, the locking fluted disc can be unlocked at the initial stage of rotating the angle adjusting handle, then adjustment is conducted, and after adjustment is completed, the locking fluted disc can automatically recover to the locking state under the elastic force effect of the reset spring; the three steps of unlocking, adjusting and locking can be automatically and sequentially completed only through rotation adjustment in any direction.

Description

Technical Field

[0001] The invention belongs to the technical field of welding and fixing, and specifically refers to a welding and fixing device for metal structural parts. Background Art

[0002] In industrial production, it is often necessary to weld square steel tubes and other profiles together to form a rack. This is the most common, simplest and lowest-cost production process for equipment racks. Since the relative position of the two parts needs to be kept stable before and during welding, it is often necessary to clamp and fix the profiles through a clamping device.

[0003] Since there is usually no precise angle limit between the main body of the frame and the diagonal support rods, they are usually not cut by high-precision processing machines. Instead, the bevels are usually cut manually on-site by a cutting machine and then welded. Therefore, without precise data, it is difficult to clamp the parts in place at one time. Generally, repeated adjustments are required until the most suitable position is reached. Since the parts and traditional fixtures are often fixed by magnetic attraction, the process of fine-tuning by hand is extremely difficult.

[0004] During actual clamping, what needs to be adjusted mainly are the relative positions and angles between the parts, and they also need to be locked after adjustment to ensure stability during welding. Summary of the invention

[0005] In view of the above situation, in order to overcome the defects of the prior art, the present invention proposes a welding and fixing device for metal structural parts. In order to solve the problem of cumbersome operations of steps such as unlocking, adjusting and locking, the present invention focuses on proposing a self-locking rotation adjustment mechanism. Through the cooperation of the fan-shaped notch and the limiting boss, the relative rotation angle of the angle adjustment handle and the rotating main shaft can be limited; through the pulling of the linkage rope, the locking gear disc can be unlocked first at the initial stage of the rotation of the angle adjustment handle, and then adjusted. After the adjustment is completed, the locking gear disc will automatically return to the locked state under the elastic force of the reset spring; through the structural design of the self-locking rotation adjustment mechanism, the three steps of unlocking, adjusting and locking can be automatically completed in sequence only by rotating in any direction, which greatly simplifies the operating steps during frequent use.

[0006] The technical solution adopted by the present invention is as follows: The present invention proposes a welding and fixing device for metal structural parts, including an angle change component, a self-locking rotation adjustment mechanism, an elastic pre-clamping mechanism and a double-piston pressure-equalizing locking mechanism, wherein the self-locking rotation adjustment mechanism is arranged on the angle change component, the elastic pre-clamping mechanism is arranged on the angle change component, the self-locking rotation adjustment mechanism and the elastic pre-clamping mechanism are respectively arranged at both ends of the angle change component, and the double-piston pressure-equalizing locking mechanism is arranged on the elastic pre-clamping mechanism.

[0007] Furthermore, the angle changing assembly includes a rotating base, a rotating swing arm, a central axis and a dial, the rotating base is composed of a circular ring portion and a sliding guide portion, the rotating swing arms are symmetrically arranged on both sides of the rotating base and are rotatably connected to the rotating base, the central axis is fixedly connected to one of the rotating swing arms, a pointer is provided at the other end of the central axis, and the dial is arranged on the other rotating swing arm.

[0008] By adjusting the angles of the two rotating swing arms, the angle between the workpieces to be welded can be adjusted and controlled.

[0009] Furthermore, the self-locking rotation adjustment mechanism includes a screw adjustment assembly, a bevel gear assembly and a self-locking rotation assembly, the screw adjustment assembly is arranged on the angle change assembly, the bevel gear assembly is rotatably arranged on the screw adjustment assembly, and the self-locking rotation assembly is rotatably arranged in the bevel gear assembly.

[0010] Through the structural design of the self-locking rotation adjustment mechanism, when rotating and adjusting in any direction, it will be unlocked first without any additional operation, and after the rotation adjustment is completed, it can automatically restore its locked state.

[0011] Preferably, the screw adjustment assembly includes a slider, a double-headed screw, a rotating shaft and a nut, the slider is slidably arranged in the sliding guide part, the double-headed screw is rotatably arranged in the slider, the rotating shaft is arranged at one end of the rotating swing arm, and the nut is provided with a hinge joint, and the nut is rotatably arranged on the rotating shaft through the hinge joint.

[0012] As a further preferred embodiment of the present invention, the bevel gear assembly includes a driven bevel gear, a driving bevel gear, a rotating bracket and a rotating main shaft, the driven bevel gear is fixedly connected to the double-headed screw, the driving bevel gear is fixedly connected to the rotating main shaft, the driving bevel gear and the driven bevel gear are meshed and transmitted, the rotating bracket is fixedly connected to the slider, the rotating main shaft is provided with a first toothed disc, the first toothed disc is rotatably arranged in the rotating bracket, the rotating main shaft is also provided with a circular convex shaft, and the top end of the circular convex shaft is provided with a fan-shaped notch.

[0013] Through the cooperation of the driven bevel gear and the active bevel gear, the double-headed screw can be rotated. At this time, through the thread cooperation between the double-headed screw and the nut, the approach or distance between the two nuts can be controlled, thereby realizing the angle adjustment of the rotating swing arm.

[0014] As a further preferred embodiment of the present invention, the self-locking rotating assembly includes an angle adjustment handle, a locking sprocket, a linkage rope and a reset spring. The angle adjustment handle is rotatably arranged in a rotating bracket. The angle adjustment handle is provided with a limiting boss matching the fan-shaped notch. The locking sprocket slides axially in the rotating bracket. The linkage rope is arranged between the locking sprocket and the angle adjustment handle. The reset spring is arranged between the locking sprocket and the angle adjustment handle.

[0015] When rotating the angle adjustment handle, through the linkage of the linkage rope, the locking gear disc can be pulled to slide away from the first gear disc, thereby unlocking the rotating main shaft. When the limiting boss abuts against the fan-shaped notch, the rotation of the angle adjustment handle can rotate the rotating main shaft together; and after the adjustment is completed, the locking gear disc automatically resets to the locked state under the elastic force of the reset spring.

[0016] Furthermore, the elastic pre-clamping mechanism includes a rolling pre-clamping component and an elastic pre-tightening component, the elastic pre-tightening component is arranged on the angle changing component, and the rolling pre-clamping component is arranged on the elastic pre-tightening component.

[0017] Through the preload force provided by the preload spring, different specifications of workpieces to be welded can be clamped at multiple points with a certain pressure through the clamping roller. On this basis, by rotating the adjustment handle at any position, the expansion and contraction of the workpiece to be welded in the elastic pre-clamping mechanism can be stably and accurately adjusted.

[0018] Preferably, the elastic preload assembly comprises a clamping base, an elastic bracket and a preload spring, the clamping base is fixedly connected to the other end of the rotating swing arm, the elastic bracket is provided with a guide column, the guide column is snap-fitted and slidably arranged in the clamping base, and the preload spring is arranged between the end of the guide column and the clamping base.

[0019] As a further preferred embodiment of the present invention, the rolling pre-clamping assembly includes a clamping fork frame and a clamping roller, the clamping fork frame is arranged on a clamping base and an elastic bracket, the clamping roller is rotatably arranged in the clamping fork frame, and a position adjustment handle is provided on the outer side of the clamping roller.

[0020] Furthermore, the dual-piston pressure-equalizing locking mechanism includes a top piston assembly and a bottom piston assembly, and the top piston assembly and the bottom piston assembly are both arranged on the elastic preload assembly, and the top piston assembly and the bottom piston assembly are arranged relative to each other.

[0021] With the hydraulic pipe running through, for workpieces to be welded of different specifications, the top piston block and the bottom piston block can apply equal clamping force after automatically adjusting to the position of contacting the workpiece to be welded; for workpieces to be welded of different specifications, it can not only adaptively adjust its own position, but also achieve stable clamping.

[0022] Preferably, the top piston assembly includes a top piston chamber, a top piston block, an adjusting piston and an adjusting screw. The top piston chamber is fixedly connected to one end of the clamping base. The top piston block and the adjusting piston are slidably engaged in the top piston chamber. The adjusting screw is rotatably arranged on the adjusting piston. The adjusting screw and the clamping base are threadedly connected.

[0023] As a further preferred embodiment of the present invention, the bottom piston assembly includes a bottom piston chamber, a bottom piston block and a hydraulic pipe. The bottom piston chamber is fixedly connected to the other end of the clamping base, the bottom piston block is snap-fitted and slidably arranged in the bottom piston chamber, and the hydraulic pipe is arranged between the top piston chamber and the bottom piston chamber.

[0024] The beneficial effects achieved by the present invention using the above structure are as follows: (1) Through the structural design of the self-locking rotation adjustment mechanism, when rotating and adjusting in any direction, it will be unlocked first without any additional operation, and after the rotation adjustment is completed, it can automatically restore its own locking state.

[0025] (2) Through the cooperation of the driven bevel gear and the active bevel gear, the double-headed screw can be rotated. At this time, through the thread cooperation between the double-headed screw and the nut, the approach or distance between the two nuts can be controlled, thereby realizing the angle adjustment of the rotating swing arm.

[0026] (3) When the angle adjustment handle is rotated, the locking sprocket can be pulled to slide away from the first sprocket through the linkage of the linkage rope, thereby unlocking the rotating spindle. When the limit boss abuts against the fan-shaped notch, the rotation of the angle adjustment handle can rotate the rotating spindle together; and after the adjustment is completed, the locking sprocket automatically resets to the locked state under the elastic force of the reset spring.

[0027] (4) Through the preload force provided by the preload spring, different specifications of the workpieces to be welded can be clamped at multiple points with a certain pressure through the clamping roller. On this basis, by rotating the adjustment handle at any position, the expansion and contraction of the workpiece to be welded in the elastic pre-clamping mechanism can be stably and accurately adjusted.

[0028] (5) With the hydraulic pipe running through, for workpieces of different specifications to be welded, the top piston block and the bottom piston block can automatically adjust to the position of contacting the workpiece to be welded and apply equal clamping force; for workpieces of different specifications to be welded, it can not only adaptively adjust its own position, but also achieve stable clamping. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A three-dimensional diagram of a welding and fixing device for a metal structural member proposed by the present invention; Figure 2 This is a front view of a welding and fixing device for a metal structural member proposed by the present invention; Figure 3 It is a left side view of a welding and fixing device for a metal structural member proposed by the present invention; Figure 4 A top view of a welding and fixing device for a metal structural member proposed by the present invention; Figure 5 for Figure 2 A cross-sectional view along the cutting line AA; Figure 6 for Figure 3 A cross-sectional view along the cutting line BB; Figure 7 for Figure 6 A cross-sectional view along the cutting line CC; Figure 8 It is a structural schematic diagram of the screw adjustment assembly and the bevel gear assembly; Fig. 9 for Figure 5 A partial enlarged view of point Ⅰ in the middle; Fig.10 for Figure 6 A partial enlarged view of the middle II; Fig.11 for Figure 6 A partial enlarged view of the middle part III; Fig.12 for Figure 7 A partial enlarged view of the middle IV; Fig.13 for Figure 1 A partial enlarged view of point V in the middle.

[0030] Among them, 1. Angle change component, 2. Self-locking rotation adjustment mechanism, 3. Elastic pre-clamping mechanism, 4. Double piston pressure-equalizing locking mechanism, 5. Rotating base, 6. Rotating swing arm, 7. Center axis, 8. Dial, 9. Ring part, 10. Sliding guide part, 11. Pointer, 12. Screw adjustment component, 13. Bevel gear component, 14. Self-locking rotation component, 15. Slider, 16. Double-headed screw, 17. Rotating shaft, 18. Nut, 19. Driven bevel gear, 20. Active bevel gear, 21. Rotating bracket, 22. Rotating spindle, 23. Angle adjustment handle, 24. Locking gear plate, 25. Linkage rope, 26 , return spring, 27, hinge head, 28, first toothed disc, 29, circular cam, 30, fan-shaped notch, 31, limit boss, 32, elastic preload assembly, 33, rolling pre-clamp assembly, 34, clamping base, 35, elastic bracket, 36, preload spring, 37, clamping fork, 38, clamping roller, 39, guide column, 40, position adjustment handle, 41, top piston assembly, 42, bottom piston assembly, 43, top piston chamber, 44, top piston block, 45, adjusting piston, 46, adjusting screw, 47, bottom piston chamber, 48, bottom piston block, 49, workpiece to be welded, 50, hydraulic pipe.

[0031] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be understood that terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “top”, “bottom”, “inside” and “outside” indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0034] like Figure 1 to Figure 13As shown, the present invention proposes a welding and fixing device for metal structural parts, including an angle changing component 1, a self-locking rotation adjusting mechanism 2, an elastic pre-clamping mechanism 3 and a double-piston pressure-equalizing locking mechanism 4, the self-locking rotation adjusting mechanism 2 is arranged on the angle changing component 1, the elastic pre-clamping mechanism 3 is arranged on the angle changing component 1, the self-locking rotation adjusting mechanism 2 and the elastic pre-clamping mechanism 3 are respectively arranged at both ends of the angle changing component 1, and the double-piston pressure-equalizing locking mechanism 4 is arranged on the elastic pre-clamping mechanism 3.

[0035] The angle changing assembly 1 includes a rotating base 5, a rotating swing arm 6, a central axis 7 and a dial 8. The rotating base 5 is composed of a circular ring portion 9 and a sliding guide portion 10. The rotating swing arms 6 are symmetrically arranged on both sides of the rotating base 5 and are rotatably connected to the rotating base 5. The central axis 7 is fixed to one of the rotating swing arms 6. A pointer 11 is provided at the other end of the central axis 7. The dial 8 is arranged on the other rotating swing arm 6.

[0036] By adjusting the angles of the two rotating swing arms 6 , the angle between the workpieces 49 to be welded can be adjusted and controlled.

[0037] The elastic pre-clamping mechanism 3 includes a rolling pre-clamping component 33 and an elastic pre-tightening component 32 . The elastic pre-tightening component 32 is arranged on the angle changing component 1 , and the rolling pre-clamping component 33 is arranged on the elastic pre-tightening component 32 .

[0038] Through the preload force provided by the preload spring 36, workpieces 49 to be welded of different specifications can be clamped at multiple points with a certain pressure through the clamping roller 38. On this basis, by rotating the adjustment handle 40 at any position, the extension and retraction of the workpiece 49 to be welded in the elastic pre-clamping mechanism 3 can be stably and accurately adjusted.

[0039] The elastic preload assembly 32 includes a clamping base 34, an elastic bracket 35 and a preload spring 36. The clamping base 34 is fixedly connected to the other end of the rotating swing arm 6. The elastic bracket 35 is provided with a guide column 39. The guide column 39 is slidably engaged in the clamping base 34. The preload spring 36 is provided between the end of the guide column 39 and the clamping base 34.

[0040] The rolling pre-clamping assembly 33 includes a clamping fork frame 37 and a clamping roller 38. The clamping fork frame 37 is arranged on the clamping base 34 and the elastic bracket 35. The clamping roller 38 is rotatably arranged in the clamping fork frame 37. A position adjustment handle 40 is arranged on the outer side of the clamping roller 38.

[0041] The double-piston pressure-equalizing locking mechanism 4 includes a top piston assembly 41 and a bottom piston assembly 42 . The top piston assembly 41 and the bottom piston assembly 42 are both arranged on the elastic preload assembly 32 , and the top piston assembly 41 and the bottom piston assembly 42 are arranged opposite to each other.

[0042] With the hydraulic pipe 50 running through, for workpieces 49 to be welded of different specifications, the top piston block 44 and the bottom piston block 48 can both apply equal clamping force after automatically adjusting to the position of contacting the workpiece 49 to be welded; for workpieces 49 to be welded of different specifications, they can both adaptively adjust their own position and achieve stable clamping.

[0043] The top piston assembly 41 includes a top piston chamber 43, a top piston block 44, an adjusting piston 45 and an adjusting screw 46. The top piston chamber 43 is fixedly connected to one end of the clamping base 34. The top piston block 44 and the adjusting piston 45 are slidably engaged in the top piston chamber 43. The adjusting screw 46 is rotatably arranged on the adjusting piston 45. The adjusting screw 46 and the clamping base 34 are threadedly connected.

[0044] The bottom piston assembly 42 includes a bottom piston chamber 47, a bottom piston block 48 and a hydraulic pipe 50. The bottom piston chamber 47 is fixedly connected to the other end of the clamping base 34. The bottom piston block 48 is slidably engaged in the bottom piston chamber 47. The hydraulic pipe 50 is arranged between the top piston chamber 43 and the bottom piston chamber 47.

[0045] The self-locking rotation adjustment mechanism 2 includes a screw adjustment component 12, a bevel gear component 13 and a self-locking rotation component 14. The screw adjustment component 12 is arranged on the angle change component 1, the bevel gear component 13 is rotatably arranged on the screw adjustment component 12, and the self-locking rotation component 14 is rotatably arranged in the bevel gear component 13.

[0046] Through the structural design of the self-locking rotation adjustment mechanism 2, when rotating and adjusting in any direction, it will be unlocked first without any additional operation, and after the rotation adjustment is completed, it can automatically restore its own locking state.

[0047] The screw adjustment assembly 12 includes a slider 15, a double-headed screw 16, a rotating shaft 17 and a nut 18. The slider 15 is slidably engaged in the sliding guide part 10, the double-headed screw 16 is rotatably arranged in the slider 15, the rotating shaft 17 is arranged at one end of the rotating swing arm 6, and a hinge joint 27 is provided on the nut 18. The nut 18 is rotatably arranged on the rotating shaft 17 through the hinge joint 27.

[0048] The bevel gear assembly 13 includes a driven bevel gear 19, a driving bevel gear 20, a rotating bracket 21 and a rotating main shaft 22. The driven bevel gear 19 is fixedly connected to the double-headed screw 16, the driving bevel gear 20 is fixedly connected to the rotating main shaft 22, the driving bevel gear 20 and the driven bevel gear 19 are meshed and transmitted, the rotating bracket 21 is fixedly connected to the slider 15, the rotating main shaft 22 is provided with a first toothed disc 28, the first toothed disc 28 is rotatably arranged in the rotating bracket 21, and the rotating main shaft 22 is also provided with a circular convex shaft 29, and the top end of the circular convex shaft 29 is provided with a fan-shaped notch 30.

[0049] Through the cooperation of the driven bevel gear 19 and the active bevel gear 20, the double-headed screw 16 can be rotated. At this time, through the threaded cooperation between the double-headed screw 16 and the nut 18, the approach or distance between the two nuts 18 can be controlled, thereby realizing the angle adjustment of the rotating swing arm 6.

[0050] The self-locking rotating assembly 14 includes an angle adjustment handle 23, a locking sprocket 24, a linkage rope 25 and a reset spring 26. The angle adjustment handle 23 is rotatably arranged in the rotating bracket 21. The angle adjustment handle 23 is provided with a limiting boss 31 matching the fan-shaped notch 30. The locking sprocket 24 slides axially in the rotating bracket 21. The linkage rope 25 is arranged between the locking sprocket 24 and the angle adjustment handle 23. The reset spring 26 is arranged between the locking sprocket 24 and the angle adjustment handle 23.

[0051] When the angle adjustment handle 23 is rotated, through the linkage of the linkage rope 25, the locking gear plate 24 can be pulled to slide away from the first gear plate 28, thereby unlocking the rotating main shaft 22. When the limiting boss 31 abuts against the fan-shaped notch 30, the rotation of the angle adjustment handle 23 can rotate the rotating main shaft 22 together; and after the adjustment is completed, the locking gear plate 24 automatically resets to the locked state under the elastic force of the reset spring 26.

[0052] During specific use, the user first needs to clamp the workpiece 49 to be welded between the rolling pre-clamping components 33 .

[0053] Embodiment 1: After the workpiece 49 to be welded is clamped, since there is rolling contact and a certain extrusion force between the clamping roller 38 and the workpiece 49 to be welded, the position adjustment handle 40 on any clamping roller 38 in contact with the workpiece 49 to be welded can be rotated to change the telescopic position of the workpiece 49 to be welded in the clamping base 34. Since there is a certain resistance to the rotation of the clamping roller 38 in the clamping fork 37, the workpiece 49 to be welded will not slide at will when it is not adjusted; After the adjustment is completed, the adjusting piston 45 is pressed down by rotating the adjusting screw 46, and the top piston block 44 and the bottom piston block 48 will both extend outward; due to the penetration of the hydraulic pipe 50, the hydraulic pressure in the top piston chamber 43 and the bottom piston chamber 47 is equal, and when one of the top piston block 44 and the bottom piston block 48 abuts against the workpiece 49 to be welded, it will stop at the current position. At this time, continuing to rotate the adjusting screw 46 will cause the other of the top piston block 44 and the bottom piston block 48 to continue to extend until it abuts against the workpiece 49 to be welded; Then continue to rotate the adjusting screw 46 to synchronously increase the pressure of the top piston block 44 and the bottom piston block 48 on the workpiece 49 to be welded, thereby completing the locking and fixation of the workpiece 49 to be welded in the top piston chamber 43. The locking torque can be roughly sensed by the resistance of rotating the adjusting screw 46, and the locking pressure can also be more accurately controlled by rotating the top piston block 44 and the bottom piston block 48 again to a specific angle after both the top piston block 44 and the bottom piston block 48 are against the workpiece 49 to be welded.

[0054] Embodiment 2: When adjusting the angle between the two workpieces 49 to be welded, it is only necessary to adjust the angle between the two rotating swing arms 6. At this time, it is only necessary to manually rotate the angle adjustment handle 23. Since the limiting boss 31 is located at the center of the fan-shaped notch 30 in the initial state, the rotating spindle 22 will not rotate along with the angle adjustment handle 23 before the limiting boss 31 abuts against the edge of the fan-shaped notch 30. At this time, the rotating angle adjustment handle 23 will cause the linkage rope 25, which is originally parallel to the angle adjustment handle 23, to be wound around the angle adjustment handle 23, thereby shortening the axial length of the linkage rope 25, and then pulling the locking toothed disc 24 to slide away from the first toothed disc 28, thereby completing the unlocking of the rotating spindle 22. The locking toothed disc 24 can only slide in the rotating bracket 21, but cannot rotate in the rotating bracket 21, while the first toothed disc 28 can rotate in the rotating bracket 21. Therefore, when the first toothed disc 28 and the locking toothed disc 24 are combined, the rotating main shaft 22 is locked and cannot rotate. When the first toothed disc 28 and the locking toothed disc 24 are separated, the rotating main shaft 22 is unlocked and can rotate. When the limiting boss 31 abuts against the edge of the sector-shaped notch 30, the angle adjustment handle 23 is continuously rotated to rotate with the rotating main shaft 22, and the double-headed screw 16 is rotated through the meshing of the driven bevel gear 19 and the driving bevel gear 20, thereby increasing or decreasing the distance between the two nuts 18, thereby achieving the angle adjustment of the rotating swing arm 6; During the rotation of the rotating swing arm 6 relative to the rotating base 5, the slider 15 can compensate the distance between the self-locking rotating adjustment mechanism 2 and the rotating base 5 by sliding on the sliding guide 10; After the adjustment is completed, it is only necessary to loosen the angle adjustment handle 23, and the locking gear disc 24 will be reset under the elastic force of the reset spring 26, and the rotating main shaft 22 will be locked again. During this process, the linkage rope 25 is straightened again and the limiting boss 31 is restored to the middle position of the fan-shaped notch 30.

[0055] Generally speaking, the angle and position of the two workpieces 49 to be welded need to be adjusted alternately for multiple times to reach a suitable state. By simplifying the operation steps, the complexity of the adjustment process can be greatly reduced.

[0056] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0057] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A welding and fixing device for metal structural parts, characterized in that: The invention comprises an angle changing component (1), a self-locking rotation adjusting mechanism (2), an elastic pre-clamping mechanism (3) and a double-piston pressure-equalizing locking mechanism (4), wherein the self-locking rotation adjusting mechanism (2) is arranged on the angle changing component (1), the elastic pre-clamping mechanism (3) is arranged on the angle changing component (1), the self-locking rotation adjusting mechanism (2) and the elastic pre-clamping mechanism (3) are arranged at two ends of the angle changing component (1), respectively, and the double-piston pressure-equalizing locking mechanism (4) is arranged on the elastic pre-clamping mechanism (3); The self-locking rotary adjustment mechanism (2) comprises a screw adjustment assembly (12), a bevel gear assembly (13) and a self-locking rotary assembly (14); the screw adjustment assembly (12) is arranged on the angle changing assembly (1), the bevel gear assembly (13) is rotatably arranged on the screw adjustment assembly (12), and the self-locking rotary assembly (14) is rotatably arranged in the bevel gear assembly (13); The elastic pre-clamping mechanism (3) comprises a rolling pre-clamping component (33) and an elastic pre-tightening component (32), wherein the elastic pre-tightening component (32) is arranged on the angle changing component (1), and the rolling pre-clamping component (33) is arranged on the elastic pre-tightening component (32); The dual-piston pressure-equalizing locking mechanism (4) comprises a top piston assembly (41) and a bottom piston assembly (42), wherein the top piston assembly (41) and the bottom piston assembly (42) are both arranged on the elastic preload assembly (32), and the top piston assembly (41) and the bottom piston assembly (42) are arranged relative to each other.

2. A welding and fixing device for a metal structural part according to claim 1, characterized in that: The angle changing assembly (1) comprises a rotating base (5), a rotating swing arm (6), a central shaft (7) and a dial (8); the rotating base (5) comprises a circular ring portion (9) and a sliding guide portion (10); the rotating swing arms (6) are symmetrically arranged on both sides of the rotating base (5) and are rotatably connected to the rotating base (5); the central shaft (7) is fixedly connected to one of the rotating swing arms (6); a pointer (11) is arranged at the other end of the central shaft (7); and the dial (8) is arranged on the other rotating swing arm (6).

3. A welding and fixing device for a metal structural part according to claim 2, characterized in that: The screw adjustment assembly (12) comprises a slider (15), a double-headed screw (16), a rotating shaft (17) and a nut (18); the slider (15) is slidably engaged in the sliding guide portion (10); the double-headed screw (16) is rotatably disposed in the slider (15); the rotating shaft (17) is disposed at one end of the rotating swing arm (6); a hinged joint (27) is provided on the nut (18); and the nut (18) is rotatably disposed on the rotating shaft (17) via the hinged joint (27).

4. A welding and fixing device for a metal structural member according to claim 3, characterized in that: The bevel gear assembly (13) comprises a driven bevel gear (19), a driving bevel gear (20), a rotating bracket (21) and a rotating main shaft (22); the driven bevel gear (19) is fixedly connected to a double-headed screw (16); the driving bevel gear (20) is fixedly connected to the rotating main shaft (22); the driving bevel gear (20) and the driven bevel gear (19) are meshed and transmitted; the rotating bracket (21) is fixedly connected to a slider (15); a first toothed disc (28) is provided on the rotating main shaft (22); the first toothed disc (28) is rotatably arranged in the rotating bracket (21); a circular convex shaft (29) is further provided on the rotating main shaft (22); a fan-shaped notch (30) is provided at the top end of the circular convex shaft (29).

5. A welding and fixing device for a metal structural member according to claim 4, characterized in that: The self-locking rotating assembly (14) comprises an angle adjustment handle (23), a locking toothed disc (24), a linkage rope (25) and a return spring (26); the angle adjustment handle (23) is rotatably arranged in a rotating bracket (21); a limiting boss (31) matching the fan-shaped notch (30) is provided on the angle adjustment handle (23); the locking toothed disc (24) slides axially in the rotating bracket (21); the linkage rope (25) is arranged between the locking toothed disc (24) and the angle adjustment handle (23); and the return spring (26) is arranged between the locking toothed disc (24) and the angle adjustment handle (23).

6. A welding and fixing device for a metal structural member according to claim 5, characterized in that: The elastic preload assembly (32) comprises a clamping base (34), an elastic bracket (35) and a preload spring (36); the clamping base (34) is fixedly connected to the other end of the rotating swing arm (6); a guide column (39) is provided on the elastic bracket (35); the guide column (39) is slidably engaged in the clamping base (34); and the preload spring (36) is provided between the end of the guide column (39) and the clamping base (34).

7. A welding and fixing device for a metal structural member according to claim 6, characterized in that: The rolling pre-clamping assembly (33) comprises a clamping fork frame (37) and a clamping roller (38); the clamping fork frame (37) is arranged on a clamping base (34) and an elastic bracket (35); the clamping roller (38) is rotatably arranged in the clamping fork frame (37); and a position adjustment handle (40) is arranged on the outer side of the clamping roller (38).

8. A welding and fixing device for a metal structural member according to claim 7, characterized in that: The top piston assembly (41) comprises a top piston chamber (43), a top piston block (44), an adjusting piston (45) and an adjusting screw (46); the top piston chamber (43) is fixedly connected to one end of the clamping base (34); the top piston block (44) and the adjusting piston (45) are slidably arranged in the top piston chamber (43); the adjusting screw (46) is rotatably arranged on the adjusting piston (45); and the adjusting screw (46) and the clamping base (34) are threadedly connected.

9. A welding and fixing device for a metal structural member according to claim 8, characterized in that: The bottom piston assembly (42) comprises a bottom piston chamber (47), a bottom piston block (48) and a hydraulic pipe (50); the bottom piston chamber (47) is fixedly connected to the other end of the clamping base (34); the bottom piston block (48) is slidably engaged in the bottom piston chamber (47); and the hydraulic pipe (50) is arranged between the top piston chamber (43) and the bottom piston chamber (47).

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