Assembly welding fixing tool for gantry crane cab

Abstract

The utility model discloses an assembling and welding fixing tool for a gantry crane cab, which comprises a base and a positioning component arranged on the base, and the positioning component comprises a front frame positioning piece and a rear frame positioning piece which are oppositely arranged along a first direction and at least one group of side frame positioning pieces which are oppositely arranged along a second direction; the two ends of the front frame positioning piece are connected with the special-shaped column supporting piece through angle adjusting assemblies in the second direction, and the special-shaped column supporting piece is rotationally connected with the front frame positioning piece in the second direction. The included angle between the front frame positioning piece and the special-shaped column supporting piece is adjusted through the angle adjusting assembly, the relative position of the front frame positioning piece and the special-shaped column supporting piece is locked, finally, positioning of the front frame body is achieved, fixing stability is improved, and welding quality is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of fixing tooling, in particular to an assembly welding fixing tooling for a gantry crane cab. Background Art

[0002] The gantry crane cab is an important component of the gantry crane and is the key area for the operator to control the gantry crane to perform lifting operations.

[0003] The main frame of the cab is welded together by combining the frames of each surface. In order to ensure that the operator has a wide field of vision when operating in the cab, the front frame of the cab can be set as an arc frame (such as Figure 1 As shown), or the lower end of the front frame is set as an inclined beam to expand the operator's visual angle in the height direction, so that the operator can better observe the object to be operated by looking down in the cab located at a high place.

[0004] like Figure 1 As shown, the main frame of the cab includes a front frame body a, a side frame body b and a rear frame body c, the front frame body a includes two front frame special-shaped columns a1 and a plurality of front frame crossbeams a2 connecting the two front frame special-shaped columns a1, the side frame body b includes two side frame columns b1 and side frame longitudinal beams b2 connecting the two side frame columns b1, and the rear frame body c includes two rear frame columns c1 and a rear frame crossbeam c2 connecting the two rear frame columns c1; before the overall welding, the bottom beam (i.e., including the bottom front frame crossbeam a21, the bottom side frame longitudinal beams b21 and the bottom rear frame crossbeam c21) combined fixation realizes the combined fixation of the front frame body a, the side frame body b and the rear frame body c; and the front frame body a is different from the side frame body b and the rear frame body c. The center of gravity of the front frame body a deviates from the bottom front frame cross beam a21 and is located on the side of the bottom front frame cross beam a21 (that is, on the side of the arc-shaped protrusion). Therefore, for the front frame body a, only the bottom front frame cross beam a21 is fixed, resulting in the overall offset of the front frame body a (offset to the side of the arc-shaped protrusion), resulting in poor fixation and poor stability, which is not conducive to welding operation and reduces welding quality. Utility Model Content

[0005] The purpose of the utility model is to overcome the defects in the prior art and provide a welding and fixing tool for a gantry crane cab to improve the stability of the fixation of the cab frame.

[0006] In order to achieve the above-mentioned technical effects, the technical solution of the utility model is: a welding and fixing tool for a gantry crane cab, comprising a base and a positioning assembly arranged on the base, the positioning assembly comprising a front frame positioning member and a rear frame positioning member arranged relatively to each other along a first direction and at least one group of side frame positioning members arranged relatively to each other along a second direction; the two ends of the front frame positioning member along the second direction are connected to the special-shaped column support member through an angle adjustment assembly, and the special-shaped column support member is rotatably connected to the front frame positioning member around the second direction.

[0007] The preferred technical solution is that the angle adjustment assembly includes an elastic member and a locking member; the two ends of the elastic member are respectively connected to the front frame positioning member and the special-shaped column support member at a first fixed end and a second fixed end, and the elastic member is extended and retracted along the connecting direction of the first fixed end and the second fixed end to adjust the angle between the front frame positioning member and the special-shaped column support member; the special-shaped column support member is rotatably connected and locked with the front frame positioning member through the locking member.

[0008] A preferred technical solution is that the front frame positioning member is retractable along the second direction.

[0009] A preferred technical solution is that both end surfaces of the front frame positioning member are provided with crossbeam abutments, and the crossbeam abutments limit the movement of the front frame body along the second direction.

[0010] A preferred technical solution is that the front frame positioning member includes an extended connecting section, and the extended connecting section is provided on a side of the front frame positioning member away from the rear frame positioning member along the first direction, and the extended connecting section is rotatably connected to the special-shaped column support member.

[0011] A preferred technical solution is that when the angle between the special-shaped column support member and the front frame positioning member is acute, the elastic member is in a relaxed state.

[0012] The preferred technical solution is that the bottom surface of the side frame positioning member is fixedly connected to the gear, the gear is meshed with the rack, the rack is connected to the linear drive mechanism, and the axle of the gear is fixedly connected to the base; the gear drives the side frame positioning member and the gear to rotate synchronously through the telescopic movement of the linear drive mechanism.

[0013] A preferred technical solution is that the front frame positioning member includes a bottom beam support seat and two bottom beam limiting members connected to the bottom beam support seat, and the two bottom beam limiting members move toward or away from each other along the first direction.

[0014] The advantages and beneficial effects of the present invention are as follows: the supporting abutment of the front frame body is achieved through the cooperative connection between the front frame positioning part and the special-shaped column support part, thereby achieving the preliminary positioning of the front frame body; the angle between the front frame positioning part and the special-shaped column support part is adjusted by the angle adjustment component and the relative position of the front frame positioning part and the special-shaped column support part is locked to finally achieve the positioning of the front frame body, improve the fixing stability, and ensure the welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is an exploded schematic diagram of the main frame structure of a gantry crane cab in the prior art;

[0016] Figure 21. It is a schematic diagram of the overall structure of the welding and fixing tooling of the gantry crane cab in the embodiment (including the main frame of the cab);

[0017] Figure 3 This is another overall structural diagram of the welding and fixing tooling for the gantry crane cab in the embodiment (excluding the cab main frame);

[0018] Figure 4 1. It is a structural schematic diagram of the welding and fixing tooling of the gantry crane cab in the embodiment, including the front frame positioning member, the angle adjustment component and the special-shaped column support member;

[0019] Figure 5 yes Figure 4 Schematic diagram of the enlarged structure at A in the middle;

[0020] Figure 6 This is a structural diagram of the welding and fixing fixture of the gantry crane cab including the side frame positioning parts, gears and racks in the embodiment;

[0021] In the figure: X: first direction; Y: second direction; Z: third direction (i.e., direction perpendicular to the base surface);

[0022] 1. Base; 11. Base surface; 12. Second guide groove; 13. Positioning hole; 2. Positioning assembly; 21. Front frame positioning member; 211. Extended connecting section; 22. Side frame positioning member; 23. Rear frame positioning member; 24. Bottom beam support seat; 241. Frame abutment surface; 25. Bottom beam limiter; 26. First guide groove; 27. Bottom beam fastener; 3. Angle adjustment assembly; 31. Elastic member; 32. Locking member; 33. First fixed end; 34. Two fixed ends; 4. Special-shaped column support member; 5. Crossbeam abutment member; 6. Gear; 61. Axle; 62. Tooth portion; 7. Rack; 8. Linear drive mechanism; a. Front frame body; a1. Front frame special-shaped column; a2. Front frame crossbeam; a21. Bottom front frame crossbeam; b. Side frame body; b1. Side frame column; b2. Side frame longitudinal beam; b21. Bottom side frame longitudinal beam; c. Rear frame body; c1. Rear frame column; c2. Rear frame crossbeam; c21. Bottom rear frame crossbeam. DETAILED DESCRIPTION

[0023] The following embodiments are used to further describe the specific embodiments of the present invention in conjunction with the accompanying drawings and examples. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0024] In the description of the present invention, it should be noted that, unless otherwise specified, “plurality” means more than two; the terms “upper”, “lower”, “left”, “right”, “inside”, “outside”, etc., indicating directions or positional relationships, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0025] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integrally molded connections; they can refer to mechanical connections or electrical connections; and they can refer to direct connections or indirect connections. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0026] like Figures 1 to 6 As shown, an embodiment of a welding and fixing tool for a gantry crane cab includes a base 1 and a positioning assembly 2 arranged on the base 1, the positioning assembly 2 includes a front frame positioning member 21 and a rear frame positioning member 23 arranged relatively to each other along a first direction, and at least one group of side frame positioning members 22 arranged relatively to each other along a second direction; along the second direction, both ends of the front frame positioning member 21 are connected to the special-shaped column support member 4 through the angle adjustment assembly 3, and the special-shaped column support member 4 is rotatably connected to the front frame positioning member 21 around the second direction.

[0027] The angle adjustment component 3 adjusts the angle between the special-shaped column support 4 and the front frame positioning component 21, so that the front frame positioning component 21 supports the bottom front frame crossbeam a21 while the special-shaped column support 4 abuts against the front frame special-shaped column a1, thereby enhancing the stability of the fixation of the front frame body a and ensuring the welding quality; at the same time, the angle adjustment component 3 cooperates with the special-shaped column support 4 and the front frame positioning component 21 to adapt to the front frame special-shaped columns a1 with different inclination angles, thereby expanding the application range of the fixing tool of the utility model.

[0028] Base 1 is used to secure positioning assembly 2 and ensure its stability. Furthermore, base 1 is provided with a plurality of positioning holes 13, through which positioning assembly 2 is secured to base 1. The positions of front frame positioning members 21, side frame positioning members 22, and rear frame positioning members 23 on base 1 are adjusted according to the size of the cab frame. The combination of base 1 and positioning assembly 2 can secure cab frames of various sizes.

[0029] Furthermore, the positioning assembly 2 has a frame abutting surface 241 abutting against the cab frame, and the frame abutting surfaces 241 of the front frame positioning member 21, the side frame positioning member 22 and the rear frame positioning member 23 are coplanar and perpendicular to the third direction, so that the front frame a, the side frame b and the rear frame c abutting against the front frame positioning member 21, the side frame positioning member 22 and the rear frame positioning member 23 are aligned in the third direction and limited along the third direction, thereby ensuring the welding quality of the driver's seat frame.

[0030] like Figure 1-5 As shown, in another preferred embodiment, the angle adjustment assembly 3 includes an elastic member 31 and a locking member 32; the two ends of the elastic member 31 are respectively connected to the front frame positioning member 21 and the special-shaped column support member 4 at the first fixed end 33 and the second fixed end 34, and the elastic member 31 is extended and retracted along the connecting line direction of the first fixed end 33 and the second fixed end 34 to adjust the angle between the front frame positioning member 21 and the special-shaped column support member 4; the special-shaped column support member 4 is rotatably connected and locked with the front frame positioning member 21 through the locking member 32.

[0031] Through the self-expansion function of the elastic member 31, after the front frame body a is placed on the front frame positioning member 21, the elastic member 31 automatically adjusts the angle between the special-shaped column support member 4 and the front frame positioning member 21, further fixing the front frame body a and improving the stability of the fixing of the front frame body a. Specifically, the elastic member 31 is a tension spring.

[0032] The locking member 32 locks the relative positions of the special-shaped column support member 4 and the front frame positioning member 21, further improving the stability of the positioning of the front frame body a.

[0033] like Figure 3-4 As shown, in another preferred embodiment, the front frame positioning member 21 is retractable along the second direction.

[0034] The front frame positioning member 21 is configured to be retractable to fix front frame bodies a of different lengths, thereby expanding the application range of the fixing tool of the utility model.

[0035] like Figure 2 、 Figure 4 and Figure 5 As shown, in another preferred embodiment, both end surfaces of the front frame positioning member 21 are provided with crossbeam abutment members 5, and the crossbeam abutment members 5 limit the front frame body a from moving along the second direction.

[0036] The provision of the crossbeam abutment 5, on the one hand, limits the position of the bottom front frame crossbeam a21 in the second direction, and on the other hand, facilitates single-person operation, thereby improving work efficiency. Furthermore, during operation, the front frame body a is placed on the front frame positioning member 21, and one end of the bottom front frame crossbeam a21 first abuts against one crossbeam abutment 5. The length of the front frame positioning member 21 is adjusted to accommodate the length of the bottom front frame crossbeam a21, and the other end of the bottom front frame crossbeam a21 then abuts against another crossbeam abutment 5. This facilitates operation, facilitates single-person operation, and improves work efficiency.

[0037] Specifically, the crossbeam abutting member 5 abuts against the end surface of the bottom front frame crossbeam a21.

[0038] like Figures 4 and 5 As shown, in another preferred embodiment, the front frame positioning member 21 includes an extended connecting section 211, and an extended connecting section 211 is provided on the side of the front frame positioning member 21 away from the rear frame positioning member 23 along the first direction, and the extended connecting section 211 is rotatably connected to the special-shaped column support member 4.

[0039] The provision of the extended connecting section 211 and its connection with the special-shaped column support 4 facilitates the angle adjustment between the special-shaped column support 4 and the front frame positioning member 21, and the special-shaped column support 4 will not interfere with the front frame body a fixed on the front frame positioning member 21; if the extended connecting section 211 is not provided, the special-shaped column support 4 is rotatably connected to the end of the front frame positioning member 21, and the special-shaped column support 4 is likely to interfere with the front frame body a during rotation.

[0040] like Figures 2 to 5 As shown, in another preferred embodiment, when the angle between the special-shaped column support member 4 and the front frame positioning member 21 is acute, the elastic member 31 is in a relaxed state.

[0041] In this embodiment, the special-shaped column support member 4 and the front frame positioning member 21 are both disposed on the base 1 . Therefore, the angle between the special-shaped column support member 4 and the front frame positioning member 21 is 0° to 180°.

[0042] When the angle between the special-shaped column support member 4 and the front frame positioning member 21 is acute, the length of the elastic member 31 is at its minimum. This length ensures that the special-shaped column support member 4 always abuts the front frame special-shaped column a1 under the tension of the elastic member 31. The supporting force of the special-shaped column support member 4 and the weight of the front frame special-shaped column a1 counteract each other to support the front frame, thereby improving the stability of the front frame and the driver's seat frame. (Because the angle between the front frame special-shaped column a1 and the side frame longitudinal beam b2 is between 0° and 180°, the elastic member 31 is always in tension after the front frame is secured, and the supporting force of the special-shaped column support member 4 is the tensile force of the elastic member 31.)

[0043] Specifically, during operation, the front frame body a is placed on the front frame positioning member 21 , the bottom front frame crossbeam a21 abuts against the crossbeam abutment member 5 , and the front frame special-shaped column a1 is aligned with the special-shaped column support member 4 .

[0044] Taking the front frame special-shaped column a1 of the front frame body a as an arc-shaped column as an example, the front frame special-shaped column a1 protrudes along the first direction and away from the rear frame positioning member 23. Along the first direction, the center of gravity of the front frame body a is on the side of the bottom front frame crossbeam a21 away from the rear frame positioning member 23. That is, if only the bottom front frame crossbeam a21 of the front frame body a is fixed, the front frame body a is easily offset to the side away from the rear frame positioning member 23 due to the influence of the center of gravity position, and the fixing stability of the front frame body a is poor.

[0045] like Figure 2 、 Figure 3 and Figure 6 As shown, in another preferred embodiment, the bottom surface of the side frame positioning member 22 is fixedly connected to the gear 6, the gear 6 is meshed with the rack 7, the rack 7 is connected to the linear drive mechanism 8, and the axle 61 of the gear 6 is fixedly connected to the base 1; the gear 6 drives the side frame positioning member 22 and the gear 6 to rotate synchronously through the telescopic movement of the linear drive mechanism 8.

[0046] The gear 6 includes an axle 61 and a tooth portion 62 rotating around the axle 61. The axle 61 is fixedly connected to the base 1. The tooth portion 62 is fixedly connected to the side frame positioning member 22 and meshes with the rack 7. The linear drive mechanism 8 drives the rack 7 to perform linear motion. The rack 7 drives the gear 6 to rotate. The side frame positioning member 22 fixedly connected to the gear 6 rotates synchronously with the gear 6 to adjust the angle between the side frame body b and the front frame body a, and between the side frame body b and the rear frame body c, thereby realizing the fixation and welding of cab frames with different structures.

[0047] Furthermore, the linear drive mechanism 8 is a cylinder that drives the rack 7 to perform linear reciprocating motion.

[0048] Furthermore, the base surface 11 of the base 1 is provided with a second guide groove 12, and the rack 7 is arranged in the second guide groove 12 and moves linearly in the second guide groove 12. The setting of the second guide groove 12 prevents the direction of the rack 7 from shifting during movement, ensuring that the rack 7 and the gear 6 are always in a meshing state.

[0049] like Figure 2-6 As shown, in another preferred embodiment, the front frame positioning member 21 includes a bottom beam support seat 24 and two bottom beam limiting members 25 connected to the bottom beam support seat 24, and the two bottom beam limiting members 25 move toward or away from each other along the first direction.

[0050] A bottom beam support 24 is mounted on the base 1 to restrict movement of the front frame body a in the third direction. A bottom beam stopper 25 is movably mounted on the bottom beam support 24 to secure the bottom front frame crossbeam a21 and restrict movement of the front frame body a in the first direction. The cooperation between the bottom beam support 24 and the bottom beam stopper 25 limits the position of the front frame body a in both the third and first directions.

[0051] Furthermore, a bottom beam fastener 27 is provided to fix the positions of the two bottom beam limiters 25 relative to the bottom beam support seat 24 through the bottom beam fastener 27, thereby fixing the front frame body a.

[0052] Specifically, the bottom beam support seat 24 of the front frame positioning member 21 is provided with a first guide groove 26, and at least one bottom beam limiting member 25 is provided in the first guide groove 26 and moves toward or away from another bottom beam limiting member 25 to limit the bottom front frame cross beam a21 in the first direction; further, after the positions of the two bottom beam limiting members 25 are determined, the relative positions of the bottom beam limiting members 25 and the bottom beam support seat 24 are locked by the bottom beam fasteners 27.

[0053] Preferably, one of the two bottom beam stoppers 25 of the front frame positioning member 21 is fixedly connected to the bottom beam support seat 24, while the other is movably connected to the bottom beam support seat 24 and moves along the first guide groove 26. This arrangement facilitates the positioning of the side frame positioning member 22 and the rear frame positioning member 23. The positions of the side frame positioning member 22 and the rear frame positioning member 23 on the base 1 are set based on the fixed bottom beam stoppers 25, specifically their relative positions along the first direction.

[0054] Furthermore, the bottom beam limiting member 25 is connected to a cylinder, and the distance between the two bottom beam limiting members 25 is adjusted by the cylinder.

[0055] Furthermore, the rear frame positioning member 23 and the side frame positioning member 22 both include a bottom beam support seat 24 and a bottom beam limiter 25, which have the same function as the bottom beam support seat 24 and the bottom beam limiter 25 in the front frame positioning member 21, and are respectively used to fix the bottom rear frame crossbeam c21 and the bottom side frame longitudinal beam b21.

[0056] Furthermore, the two bottom beam stoppers 25 of the side frame locating member 22 are movably connected to the bottom beam support base 24; this arrangement facilitates adjustment of the distance between the two side frame locating members 22. The two bottom beam stoppers 25 of the rear frame locating member 23 are also movably connected to the bottom beam support base 24; this arrangement facilitates adjustment of the distance between the rear frame locating member 23 and the front frame locating member 21.

[0057] Furthermore, the positioning assembly 2 has a frame abutting surface 241 abutting against the cab frame, that is, the bottom beam support seat 24 has a frame abutting surface 241 abutting against the cab frame, and the first guide groove 26 is provided on the frame abutting surface 241 .

[0058] The operating steps of the utility model are as follows:

[0059] Step 1: After determining the distance between the front frame a and the rear frame c, and the distance between the two side frames b (i.e., the distance between the two axles 61), place the positioning assembly 2 on the base 1 according to the above distance.

[0060] Step 2: Secure the front frame body a to the front frame positioning member 21. First, along the second direction, one end face of the bottom front frame crossbeam a21 abuts against the crossbeam abutment member 5. Second, adjust the length of the front frame positioning member 21 so that the other end face of the bottom front frame crossbeam a21 abuts against the other crossbeam abutment member 5. Next, adjust the spacing of the bottom beam stoppers 25 and move the bottom beam stoppers 25 along the first guide slots 26 so that the bottom front frame crossbeam a21 is sandwiched between the two bottom beam stoppers 25 and is locked and secured with the bottom beam fasteners 27. Finally, while the bottom front frame crossbeam a21 is secured, the angle adjustment assembly 3 self-adjusts the angle between the front frame positioning member 21 and the special-shaped column support member 4, and abuts the special-shaped column support member 4 against the front frame special-shaped column a1, locking the relative positions of the front frame positioning member 21 and the special-shaped column support member 4. This completes the process of securing the front frame body a to the front frame positioning member 21.

[0061] Step 3: Secure side frame b to side frame locating member 22. First, place side frame b on side frame locating member 22, with one side frame column b1 abutting against the front frame column a1 of front frame a. Adjust the spacing between the two bottom beam stoppers 25 of side frame locating member 22 to secure the bottom side frame longitudinal beam b21 of side frame b. Next, according to the required assembly angle of the driver's seat frame, drive the linear drive mechanism 8 to rotate the side frame locating member 22 about the third direction until the angle between side frame b and front frame a is adjusted to the desired angle. Finally, loosen the bottom beam stoppers 25, fine-tune the position of side frame b along the first direction until it abuts against front frame a, adjust the spacing between the two bottom beam stoppers 25, and tighten. This completes the securing of side frame b.

[0062] Step 4: Secure the rear frame C to the rear frame positioning members 23. First, place the rear frame C on the rear frame positioning members 23 and move it in the second direction until it abuts against the side frames B on either side. Finally, adjust the distance between the two bottom beam stoppers 25 and tighten the rear frame C. This completes the securement of the rear frame C to the driver's seat frame.

[0063] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A welding fixture for a gantry crane cab, characterized in that: The invention comprises a base (1) and a positioning assembly (2) arranged on the base (1), wherein the positioning assembly (2) comprises a front frame positioning member (21) and a rear frame positioning member (23) arranged relative to each other along a first direction, and at least one set of side frame positioning members (22) arranged relative to each other along a second direction; along the second direction, both ends of the front frame positioning member (21) are connected to a special-shaped column support member (4) via an angle adjustment assembly (3), and the special-shaped column support member (4) is rotatably connected to the front frame positioning member (21) around the second direction.

2. The assembly welding fixture according to claim 1, characterized in that: The angle adjustment assembly (3) comprises an elastic member (31) and a locking member (32); the two ends of the elastic member (31) are respectively connected to the front frame positioning member (21) and the special-shaped column support member (4) at a first fixed end (33) and a second fixed end (34); the elastic member (31) is extended and retracted along the connecting line direction of the first fixed end (33) and the second fixed end (34) to adjust the angle between the front frame positioning member (21) and the special-shaped column support member (4); the special-shaped column support member (4) is rotationally connected and locked with the front frame positioning member (21) via the locking member (32).

3. The assembly welding fixture according to claim 2, characterized in that: The front frame positioning member (21) is retractable along the second direction.

4. The assembly welding fixture according to claim 3, characterized in that: Crossbeam abutment members (5) are provided on both end surfaces of the front frame positioning member (21), and the crossbeam abutment members (5) limit the front frame body (a) from moving along the second direction.

5. The assembly welding fixture according to claim 4, characterized in that: The front frame positioning member (21) comprises an extended connecting section (211), and the extended connecting section (211) is provided on a side of the front frame positioning member (21) facing away from the rear frame positioning member (23) along a first direction, and the extended connecting section (211) is rotatably connected to the special-shaped column support member (4).

6. The assembly welding fixture according to claim 5, characterized in that: When the angle between the special-shaped column support member (4) and the front frame positioning member (21) is acute, the elastic member (31) is in a relaxed state.

7. The assembly welding fixture according to claim 1, characterized in that: The bottom surface of the side frame positioning member (22) is fixedly connected to the gear (6), the gear (6) is meshed with the rack (7), the rack (7) is connected to the linear drive mechanism (8), and the axle (61) of the gear (6) is fixedly connected to the base (1); the gear (6) drives the side frame positioning member (22) and the gear (6) to rotate synchronously through the telescopic movement of the linear drive mechanism (8).

8. The assembly welding fixture according to claim 5, characterized in that: The front frame positioning member (21) comprises a bottom beam support seat (24) and two bottom beam limiting members (25) connected to the bottom beam support seat (24), and the two bottom beam limiting members (25) move toward or away from each other along the first direction.

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