Welding tool for lower frame main body of lifting appliance

Abstract

The utility model belongs to the technical field of automobile production line equipment, and relates to a lifting appliance lower frame main body welding tool which comprises a flexible platform and further comprises a transverse edge beam positioning seat, a longitudinal connecting beam positioning seat and a roller shaft seat positioning seat, and the transverse edge beam positioning seat, the longitudinal connecting beam positioning seat and the roller shaft seat positioning seat are all arranged on the flexible platform. The transverse edge beam positioning seats comprise the first transverse edge beam positioning seat, the second transverse edge beam positioning seat, the third transverse edge beam positioning seat and the fourth transverse edge beam positioning seat. The longitudinal connecting beam positioning seats comprise a longitudinal connecting beam positioning seat I, a longitudinal connecting beam positioning seat II, a longitudinal connecting beam positioning seat III, a longitudinal connecting beam positioning seat IV, a longitudinal connecting beam positioning seat V, a longitudinal connecting beam positioning seat VI, a longitudinal connecting beam positioning seat VII and a longitudinal connecting beam positioning seat VIII; the roller shaft seat positioning seats comprise the first roller shaft seat positioning seat, the second roller shaft seat positioning seat, the third roller shaft seat positioning seat and the fourth roller shaft seat positioning seat. The mold has the advantages of high assembling and positioning speed, convenience in demolding and the like, and has relatively high innovativeness.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile production line equipment, and in particular relates to a welding tool for a main body of a lower frame of a sling. Background Art

[0002] The lower frame of the hoist is an important component of the hoist of the automobile production line. It consists of the main body of the lower frame of the hoist and accessories. The main body of the lower frame of the hoist is mainly composed of a horizontal side beam 34, a horizontal side beam 47, a longitudinal side beam 43, a longitudinal side beam 48, a longitudinal connecting beam 41, a longitudinal connecting beam 46, and a roller shaft seat. The roller shaft seat includes a roller shaft seat 36, a roller shaft seat 42, a roller shaft seat 3 49, and a roller shaft seat 45, which are all composed of a left ear plate 53 and a right ear plate 52. The left ear plate and the right ear plate are both provided with roller shaft holes 51 and 54; the accessories include a Hafen groove linear guide 35, a locking device base 38, a sensing device base 50, a horizontal connecting beam 37, a horizontal connecting beam 2 40, a horizontal connecting beam 3 44, and a small connecting beam 39. To make the lower frame of the sling, the first thing to do is to assemble and weld the horizontal side beam 1, horizontal side beam 2, longitudinal side beam 1, longitudinal side beam 2, longitudinal connecting beam 1, longitudinal connecting beam 2, and roller shaft seat of the main body of the lower frame of the sling, and then weld the accessories. The technical requirements for welding the main body of the lower frame of the sling are that the horizontal side beam 1 and the horizontal side beam 2 must be parallel, and the spacing must meet the requirements; the longitudinal side beam 1, the longitudinal side beam 2, the longitudinal connecting beam 1, and the longitudinal connecting beam 2 must be parallel to each other and perpendicular to the horizontal side beam 1 and the horizontal side beam 2, and the spacing between the longitudinal side beam 1, the longitudinal side beam 2, the longitudinal connecting beam 1, and the longitudinal connecting beam 2 must meet the requirements; the roller shaft seat 1 and the roller shaft seat 2, the roller shaft seat 3 and the roller shaft seat 4 must be coaxial, and the roller shaft seat 1, the roller shaft seat 2, the roller shaft seat 3, and the roller shaft seat 4 must be arranged in a rectangular shape, and the spacing between them must meet the requirements.

[0003] In the past, there was no special jig for the assembly and welding of the main frame of the sling, and the three-coordinate positioning method was mostly used for assembly and welding. This method is slow and inefficient. In response to the previous problems, our company independently developed and designed a welding tool for the main frame of the sling, which can complete the positioning and assembly of the main frame of the sling at one time, with fast assembly speed and high efficiency, and achieved very satisfactory results. Summary of the invention

[0004] The utility model aims to overcome the deficiencies of the prior art and provide a welding tool for the main body of the lower frame of the sling which can position and assemble the main body of the lower frame of the sling at one time, has fast assembly speed, high efficiency, high positioning accuracy and convenient demoulding.

[0005] The utility model solves the technical problem through the following technical solutions:

[0006] A welding tool for the main body of the lower frame of a sling, including a flexible platform, characterized in that: it also includes a horizontal side beam positioning seat, a longitudinal connecting beam positioning seat, and a roller shaft seat positioning seat, the horizontal side beam positioning seat, the longitudinal connecting beam positioning seat, and the roller shaft seat positioning seat are all arranged on the flexible platform, the horizontal side beam positioning seat includes a horizontal side beam positioning seat 1, a horizontal side beam positioning seat 2, a horizontal side beam positioning seat 3, and a horizontal side beam positioning seat 4, the horizontal side beam positioning seat 1, the horizontal side beam positioning seat 4 and the horizontal side beam positioning seat 2, the horizontal side beam positioning seat 3 are respectively arranged at two ends of the tooling, the longitudinal connecting beam positioning seat includes a longitudinal connecting beam positioning seat 1, a longitudinal connecting beam positioning seat 2, a longitudinal connecting beam positioning seat 3, and a longitudinal connecting beam positioning seat The roller shaft seat positioning seat comprises roller shaft seat positioning seat one, roller shaft seat positioning seat two, roller shaft seat positioning seat three, roller shaft seat positioning seat four, roller shaft seat positioning seat one, roller shaft seat positioning seat two, roller shaft seat positioning seat three, roller shaft seat positioning seat four are arranged in the middle of the tooling in a rectangular shape.

[0007] Moreover, the horizontal side beam positioning seat 1, horizontal side beam positioning seat 2, horizontal side beam positioning seat 3, horizontal side beam positioning seat 4, longitudinal connecting beam positioning seat 1, longitudinal connecting beam positioning seat 2, longitudinal connecting beam positioning seat 3, longitudinal connecting beam positioning seat 4, longitudinal connecting beam positioning seat 5, longitudinal connecting beam positioning seat 6, longitudinal connecting beam positioning seat 7, and longitudinal connecting beam positioning seat 8 have the same structure, and are all composed of a bottom plate 1, a positioning plate 1, and a first reinforcement rib. The bottom plate 1 and the positioning plate 1 are vertically fixedly connected, and the reinforcement rib is connected between the bottom plate 1 and the positioning plate 1.

[0008] Moreover, the first positioning plate is provided with a first positioning surface.

[0009] Moreover, the roller shaft seat positioning seat one, roller shaft seat positioning seat two, roller shaft seat positioning seat three, and roller shaft seat positioning seat four have the same structure, and are all composed of a left positioning seat, a right positioning seat, a positioning pin shaft, a pad one, and a pad two. The left positioning seat and the right positioning seat are arranged opposite to each other, the positioning shaft is arranged on the left positioning seat and the right positioning seat, and the pad one and the pad two are arranged between the left positioning seat and the workpiece.

[0010] Moreover, the left positioning seat and the right positioning seat have the same structure, both consisting of a second bottom plate, a second positioning plate, and a second reinforcing rib. The second bottom plate and the second positioning plate are vertically fixedly connected, and the reinforcing rib is connected between the second bottom plate and the second positioning plate.

[0011] Moreover, the second positioning plate is provided with a second positioning surface and a semicircular positioning pin shaft seat.

[0012] The advantages and beneficial effects of the utility model are:

[0013] 1. The utility model of the welding tool for the main body of the lower frame of the sling can position and assemble various parts of the main body of the lower frame of the sling at one time, with high positioning accuracy, fast assembly speed and high efficiency.

[0014] 2. The welding tooling of the main body of the lower frame of the sling of the utility model is provided with a backing plate 1 and a backing plate 2, which is convenient for assembly and demoulding.

[0015] 3. The structural design of the welding tooling for the main body of the lower frame of the sling of the utility model is scientific and reasonable. It has the advantages of being able to position and assemble all the components of the main body of the lower frame of the sling at one time, fast assembly and positioning speed, high efficiency, and convenient demoulding. It is a welding tooling for the main body of the lower frame of the sling with high innovation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model (top view);

[0017] Figure 2 It is a structural schematic diagram of the utility model (axial view);

[0018] Figure 3 This is a structural diagram of the longitudinal connecting beam positioning seat 5 (axial view).

[0019] Figure 4 It is a schematic diagram of the roller shaft seat positioning seat structure (axis view);

[0020] Figure 5 It is a schematic diagram of the right positioning seat structure (axial view);

[0021] Figure 6 This is a schematic diagram of the lower frame structure of the spreader (top view).

[0022] Figure 7 It is a structural schematic diagram of the roller shaft seat (axis view);

[0023] Figure 8 This is the assembly drawing for positioning the lower frame of the sling.

[0024] Notes on the attached drawings:

[0025] 1-Horizontal side beam positioning seat 1, 2-Longitudinal connecting beam positioning seat 1, 3-Roller shaft seat positioning seat 1, 4-Longitudinal connecting beam positioning seat 2, 5-Flexible platform, 6-Longitudinal connecting beam positioning seat 3, 7-Roller shaft seat positioning seat 2, 8-Longitudinal connecting beam positioning seat 4, 9-Horizontal side beam positioning seat 2, 10-Horizontal side beam positioning seat 4, 11-Longitudinal connecting beam positioning seat 8, 12-Roller shaft seat positioning seat 4, 13-Longitudinal connecting beam positioning seat 7, 14-Longitudinal connecting beam positioning seat 6, 15-Roller shaft seat positioning seat 3, 16-Longitudinal connecting beam positioning seat 5, 17-Horizontal side beam positioning seat 3, 18-Bottom plate 1, 19-Assembly hole, 20-First reinforcement rib, 21-Positioning plate 1, 22-First positioning surface, 23-Assembly hole, 24-Left positioning seat, 25-Second reinforcement rib , 26-pad one, 27-bottom plate two, 28-positioning plate two, 29-pad two, 30-positioning pin, 31-right positioning seat, 32-semicircular positioning pin seat, 33-second positioning surface, 34-transverse side beam one, 35-Hafen groove linear guide, 36-roller shaft seat one, 37-transverse connecting beam one, 38-locking device base, 39-small connecting beam, 40-transverse connecting beam two, 41-longitudinal connecting beam one, 42-roller shaft seat two, 43-longitudinal side beam one, 44-transverse connecting beam three, 45-roller shaft seat four, 46-longitudinal connecting beam two, 47-transverse side beam two, 48-longitudinal side beam two, 49-roller shaft seat three, 50-sensing device base, 51-roller shaft hole, 52-right ear plate, 53-left ear plate, 54-roller shaft hole. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below through specific embodiments. The following embodiments are merely descriptive and not restrictive, and the protection scope of the present invention cannot be limited by them.

[0027] A welding tool for the main body of the lower frame of a sling includes a flexible platform 5, and its innovation lies in: it also includes a horizontal side beam positioning seat, a longitudinal connecting beam positioning seat, and a roller shaft seat positioning seat, and the horizontal side beam positioning seat, the longitudinal connecting beam positioning seat, and the roller shaft seat positioning seat are all arranged on the flexible platform.

[0028] The transverse side beam positioning seat includes a transverse side beam positioning seat 1, a transverse side beam positioning seat 2 9, a transverse side beam positioning seat 3 17, and a transverse side beam positioning seat 4 10. The transverse side beam positioning seat 1 and the transverse side beam positioning seat 4 are respectively arranged at the two ends of the tooling relative to the transverse side beam positioning seat 2 and the transverse side beam positioning seat 3.

[0029] The longitudinal connecting beam positioning seat includes a longitudinal connecting beam positioning seat 1 2, a longitudinal connecting beam positioning seat 2 4, a longitudinal connecting beam positioning seat 3 6, a longitudinal connecting beam positioning seat 4 8, a longitudinal connecting beam positioning seat 5 16, a longitudinal connecting beam positioning seat 6 14, a longitudinal connecting beam positioning seat 7 13, and a longitudinal connecting beam positioning seat 8 11. The longitudinal connecting beam positioning seat 1, the longitudinal connecting beam positioning seat 2, the longitudinal connecting beam positioning seat 3, and the longitudinal connecting beam positioning seat 4 are arranged in the middle of the tooling with the longitudinal connecting beam positioning seat 5, the longitudinal connecting beam positioning seat 6, the longitudinal connecting beam positioning seat 7, and the longitudinal connecting beam positioning seat 8 facing each other.

[0030] The roller shaft seat positioning seat includes a roller shaft seat positioning seat 1 3, a roller shaft seat positioning seat 2 7, a roller shaft seat positioning seat 3 15, and a roller shaft seat positioning seat 4 12. The roller shaft seat positioning seat 1, the roller shaft seat positioning seat 2, the roller shaft seat positioning seat 3, and the roller shaft seat positioning seat 4 are arranged in a rectangular shape in the middle of the tooling.

[0031] The horizontal side beam positioning seat 1, the horizontal side beam positioning seat 2, the horizontal side beam positioning seat 3, the horizontal side beam positioning seat 4, the longitudinal connecting beam positioning seat 1, the longitudinal connecting beam positioning seat 2, the longitudinal connecting beam positioning seat 3, the longitudinal connecting beam positioning seat 4, the longitudinal connecting beam positioning seat 5, the longitudinal connecting beam positioning seat 6, the longitudinal connecting beam positioning seat 7 and the longitudinal connecting beam positioning seat 8 have the same structure, and are all composed of a bottom plate 18, a positioning plate 21, and a first reinforcing rib 20. The bottom plate 1 and the positioning plate 1 are vertically fixedly connected, and the first reinforcing rib is connected between the bottom plate 1 and the positioning plate 1.

[0032] Bottom plate 1 is provided with assembly holes 19 thereon.

[0033] The first positioning plate has a first positioning surface 22 formed thereon.

[0034] The roller shaft seat locating seat 1, roller shaft seat locating seat 2, roller shaft seat locating seat 3 and roller shaft seat locating seat 4 have the same structure, and are all composed of a left locating seat 24, a right locating seat 31, a locating pin shaft 30, a pad 1 26 and a pad 2 29. The left locating seat and the right locating seat are arranged opposite to each other, the locating shaft is arranged on the right locating seat in the detachment, and the pad 1 and the pad 2 are arranged between the left locating seat and the workpiece.

[0035] The left positioning seat and the right positioning seat have the same structure and opposite directions. They are both composed of a second bottom plate 27, a second positioning plate 28, and a second reinforcing rib 25. The second bottom plate and the second positioning plate are vertically fixedly connected, and the second reinforcing rib is connected between the second bottom plate and the second positioning plate.

[0036] Bottom plate 2 has an assembly hole 23 formed thereon.

[0037] The second positioning plate has a second positioning surface 33 and a semicircular positioning pin seat 32 formed thereon.

[0038] When making the mold, you must do the following:

[0039] 1. The positioning surfaces of the horizontal side beam positioning seat 1 and the horizontal side beam positioning seat 3 must be in the same plane; the positioning surfaces of the horizontal side beam positioning seat 2 and the horizontal side beam positioning seat 4 must be in the same plane; the positioning surfaces of the horizontal side beam positioning seat 1 and the horizontal side beam positioning seat 3 must be parallel to the positioning surfaces of the horizontal side beam positioning seat 2 and the horizontal side beam positioning seat 4; the distance between the positioning surfaces of the horizontal side beam positioning seat 1 and the horizontal side beam positioning seat 3 and the positioning surfaces of the horizontal side beam positioning seat 2 and the horizontal side beam positioning seat 4 is equal to the distance between the outer side surfaces of the horizontal side beam 1 and the horizontal side beam 2.

[0040] 2. The locating surfaces of the longitudinal connecting beam locating seats one, two, three, and four must be in the same plane, and the locating surfaces of the longitudinal connecting beam locating seats five, six, seven, and eight must be in the same plane; the locating surfaces of the longitudinal connecting beam locating seats one, two, three, and four and the locating surfaces of the longitudinal connecting beam locating seats five, six, seven, and eight must be parallel to each other; the distance between the locating surfaces of the longitudinal connecting beam locating seats one, two, three, and four and the locating surfaces of the longitudinal connecting beam locating seats five, six, seven, and eight is equal to the distance between the inner side surfaces of the longitudinal connecting beam one and the longitudinal connecting beam two.

[0041] 3. The relative positions of roller shaft seat locating seat 1, roller shaft seat locating seat 2, roller shaft seat locating seat 3 and roller shaft seat locating seat 4 are the same as the relative positions of roller shaft seat 1, roller shaft seat 2, roller shaft seat 3 and roller shaft seat 4; the locating surfaces on the left locating seat and the right locating seat of roller shaft seat locating seat 1 and roller shaft seat locating seat 3 are respectively in the same plane; the locating surfaces on the left locating seat and the right locating seat of roller shaft seat locating seat 2 and roller shaft seat locating seat 4 are respectively in the same plane; all the locating surfaces of the roller shaft seat locating seat are perpendicular to the locating surfaces of the longitudinal connecting beam locating seats 1, 2, 3 and 4, and parallel to the locating surfaces of the transverse side beam locating seat; the inner diameter of the semicircular locating pin seat of the roller shaft seat locating seat is the same as the outer diameter of the locating pin shaft, the outer diameter of the roller shaft and the inner diameter of the roller shaft hole; the roller shaft seat locating seat 1, roller shaft seat The semicircular locating pin seats on the left and right locating seats of locating seat two must be coaxial and concentric, and the semicircular locating pin seats on the left and right locating seats of roller shaft seat locating seat three and roller shaft seat locating seat four must be coaxial and concentric; the distance between the locating surfaces of the left and right locating seats of roller shaft seat locating seat one, roller shaft seat locating seat two, roller shaft seat locating seat three, and roller shaft seat locating seat four is equal to the distance between the outer sides of the left and right ear plates of the roller shaft seat plus the thickness of the pad; the distance between the locating surface on the left locating seat of roller shaft seat locating seat one and roller shaft seat locating seat three and the locating surface on the right locating seat of roller shaft seat locating seat two and roller shaft seat locating seat four minus the thickness of the pad is equal to the distance between the outer sides of the left ear plates of roller shaft seat one and roller shaft seat three and the outer sides of the right ear plates of roller shaft seat two and roller shaft seat four.

[0042] The working principle of this utility model:

[0043] Assembly steps of the lower frame of the spreader:

[0044] 1. Assemble the mold: fix each positioning seat to the flexible platform with positioning pins according to technical requirements. In the actual assembly and positioning process, all positioning pins are mixed with positioning pins and positioning screws, that is, one hole uses a positioning pin and the adjacent hole uses a positioning screw. This can ensure the stability and firmness of the workpiece and improve the assembly efficiency.

[0045] 2. Assemble and position the horizontal side beam 2: Place the horizontal side beam 2 close to the positioning surfaces of the horizontal side beam positioning seat 2 and the horizontal side beam positioning seat 4 on the flexible platform, and clamp it with pliers if necessary.

[0046] 3. Assemble and position the longitudinal connecting beam 1 and longitudinal connecting beam 2: Place the longitudinal connecting beam 1 and longitudinal connecting beam 2 on the flexible platform, close to the positioning surfaces of the longitudinal connecting beam positioning seats 1, 2, 3, 4 and the longitudinal connecting beam positioning seats 5, 6, 7, 8, respectively, with the right end close to the inner side of the horizontal side beam. Clamp and fix with pliers if necessary.

[0047] 4. Assemble and position the horizontal side beam 1: Place the horizontal side beam 1 between the positioning surfaces of the horizontal side beam positioning seat 1 and the horizontal side beam positioning seat 3 and the ends of the longitudinal connecting beam 1 and the longitudinal connecting beam 2. If necessary, clamp and fix it with pliers.

[0048] 5. Assemble and position the left ear plate and right ear plate of each roller shaft seat: press the left ear plate and right ear plate of each roller shaft seat against the corresponding positioning surfaces on the left positioning seat and the right positioning seat respectively, place each pad plate 1 and pad plate 2 between the positioning surface of the left positioning seat of the corresponding roller shaft seat and the left ear plate, press the inner side surface of the left ear plate and the right ear plate of each roller shaft seat against the longitudinal connecting beam, place each positioning pin in the semicircular positioning pin seat on the corresponding left ear plate and the right ear plate, make the two semicircular positioning pin seats on the left ear plate and the right ear plate concentric, and fix each left ear plate and the right ear plate with pliers.

[0049] 6. Assemble and position the small connecting beam: At this time, the small connecting beam of the accessories can be roughly positioned and assembled to the outside of the longitudinal connecting beam 1 and the longitudinal connecting beam 2.

[0050] 7. Assemble and position the longitudinal side beams 1 and 2: press the longitudinal side beams 1 and 2 against the corresponding outer sides of the left ear plate and the right ear plate respectively, so that the right ends of the longitudinal side beams 1 and 2 are pressed against the positioning surfaces of the transverse side beam positioning seat 2 and the transverse side beam positioning seat 4; at this time, adjust the transverse side beams 1 and 2 so that the two ends of the transverse side beams 1 and 2 are pressed against the inner sides of the longitudinal side beams 1 and 2 respectively, and then fix them with pliers.

[0051] 8. Spot welding: Spot weld the joints of each component of the main frame under the sling.

[0052] 9. Demoulding: Loosen and remove each pliers, remove the pad 1 and pad 2 of each roller shaft seat positioning seat, and remove the lower frame of the boom from the tooling as a whole.

[0053] 10. Welding: After demoulding, perform overall welding and weld each accessory.

[0054] 11. Re-inspection: After the overall welding is completed, put the arm back into the arm positioning jig for re-inspection and make adjustments if necessary.

[0055] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A welding tool for a main body of a lower frame of a sling, comprising a flexible platform (5), characterized in that: It also includes a transverse side beam positioning seat, a longitudinal connecting beam positioning seat, and a roller shaft seat positioning seat. The transverse side beam positioning seat, the longitudinal connecting beam positioning seat, and the roller shaft seat positioning seat are all arranged on the flexible platform (5). The transverse side beam positioning seat includes a transverse side beam positioning seat 1 (1), a transverse side beam positioning seat 2 (9), a transverse side beam positioning seat 3 (17), and a transverse side beam positioning seat 4 (10). The transverse side beam positioning seat 1 (1) and the transverse side beam positioning seat 4 (10) are arranged at two ends of the tooling relative to the transverse side beam positioning seat 2 (9) and the transverse side beam positioning seat 3 (17). The longitudinal connecting beam positioning seat includes a longitudinal connecting beam positioning seat 1 (2), a longitudinal connecting beam positioning seat 2 (4), a longitudinal connecting beam positioning seat 3 (6), a longitudinal connecting beam positioning seat 4 (8), a longitudinal connecting beam positioning seat 5 (16), and a longitudinal connecting beam positioning seat 6 (14 ), longitudinal connecting beam positioning seat seven (13), longitudinal connecting beam positioning seat eight (11), longitudinal connecting beam positioning seat one (2), longitudinal connecting beam positioning seat two (4), longitudinal connecting beam positioning seat three (6), longitudinal connecting beam positioning seat four (8) and longitudinal connecting beam positioning seat five (16), longitudinal connecting beam positioning seat six (14), longitudinal connecting beam positioning seat seven (13), longitudinal connecting beam positioning seat eight (11) are arranged in the middle of the tooling in a back-to-back manner, and the roller shaft seat positioning seat includes a roller shaft seat positioning seat one (3), a roller shaft seat positioning seat two (7), a roller shaft seat positioning seat three (15), and a roller shaft seat positioning seat four (12), and the roller shaft seat positioning seat one (3), the roller shaft seat positioning seat two (7), the roller shaft seat positioning seat three (15), and the roller shaft seat positioning seat four (12) are arranged in a rectangular shape in the middle of the tooling.

2. The welding tool for the main body of the lower frame of the sling according to claim 1 is characterized in that: The transverse side beam positioning seat 1 (1), the transverse side beam positioning seat 2 (9), the transverse side beam positioning seat 3 (17), the transverse side beam positioning seat 4 (10), the longitudinal connecting beam positioning seat 1 (2), the longitudinal connecting beam positioning seat 2 (4), the longitudinal connecting beam positioning seat 3 (6), the longitudinal connecting beam positioning seat 4 (8), the longitudinal connecting beam positioning seat 5 (16), the longitudinal connecting beam positioning seat 6 (14), the longitudinal connecting beam positioning seat 7 (13), and the longitudinal connecting beam positioning seat 8 (11) have the same structure, and are all composed of a bottom plate 1 (18), a positioning plate 1 (21), and a first reinforcing rib (20). The bottom plate 1 (18) and the positioning plate 1 (21) are vertically fixedly connected, and the first reinforcing rib (20) is connected between the bottom plate 1 (18) and the positioning plate 1 (21).

3. The welding tool for the main body of the lower frame of the sling according to claim 2 is characterized in that: The first positioning plate (21) is provided with a first positioning surface (22).

4. The welding tool for the main body of the lower frame of the sling according to claim 1 is characterized in that: The roller shaft seat positioning seat 1 (3), the roller shaft seat positioning seat 2 (7), the roller shaft seat positioning seat 3 (15), and the roller shaft seat positioning seat 4 (12) have the same structure, and are all composed of a left positioning seat (24), a right positioning seat (31), a positioning pin shaft (30), a backing plate 1 (26), and a backing plate 2 (29). The left positioning seat (24) and the right positioning seat (31) are arranged opposite to each other, the positioning shaft is arranged on the left positioning seat (24) and the right positioning seat (31), and the backing plate 1 (26) and the backing plate 2 (29) are arranged between the left positioning seat (24) and the workpiece.

5. The welding tool for the main body of the lower frame of the sling according to claim 4 is characterized in that: The left positioning seat (24) and the right positioning seat (31) have the same structure, and are both composed of a second bottom plate (27), a second positioning plate (28), and a second reinforcing rib (25). The second bottom plate (27) and the second positioning plate (28) are vertically fixedly connected, and the reinforcing rib (25) is connected between the second bottom plate (27) and the second positioning plate (28).

6. The welding tool for the main body of the lower frame of the sling according to claim 5 is characterized by: The second positioning plate (28) is provided with a second positioning surface (33) and a semicircular positioning pin seat (32).

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