Jacking structure and adjustable welding tool

Abstract

The utility model provides a back shore structure and an adjustable welding tool, the back shore structure uses supporting columns matched with a top beam to serve as a foundation frame, and positioning supporting pieces are installed on the stand columns on the two sides in a penetrating mode; the back shore structure is further provided with a pushing structure, and the positioning supporting piece further comprises a reset spring. The telescopic length of the limiting structure can be adjusted to adapt to packaging boxes of different sizes; the adjustable welding tool further comprises a support and a restraining frame, a to-be-welded box is reversely buckled on the support, the to-be-welded box is restrained from inside to outside through the jacking structure, the to-be-welded box is restrained from outside to inside through the restraining frame, and welding operation can be started after the to-be-welded box is fixed. After welding is completed, the propelling structure is retracted, the reset spring can drive the positioning supporting piece to reset, and then the packaging box can be rapidly taken down, the method that in the prior art, a cushion block is used for compensating the distance between a welding tool and an unsuitable packaging box is avoided, and the problems that in the prior art, a packaging box welding tool is complex in operation and low in welding efficiency are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of support welding spare support, especially top support structure and adjustable welding tool. BACKGROUND

[0002] Large steel structure packaging box generally adopts sheet material to weld, in order to guarantee the welding efficiency of large steel structure packaging box, such as Figures 7-9 As shown in the prior art, the pre-prepared U-shaped cross-section to be welded box body 4 and the corresponding to be welded box body end plate 21 are aligned and welded into a packaging box body, and finally a packaging box cover plate is installed to complete the production of the packaging box. The to-be-welded box body 4 has a certain length, so that the packaging box body formed by welding the pre-prepared to-be-welded box body 4 and the to-be-welded box body end plate 21 can reduce the number of welding seams while ensuring the high strength of the box body structure, thereby improving the welding efficiency. In the prior art, when welding packaging boxes of different sizes, the to-be-welded box body 4 and the to-be-welded box body end plate 21 are inverted and clamped on the corresponding size of the welding tool. When welding the box body 4 and the to-be-welded box body end plate 21, it is necessary to strictly ensure that the splicing joint of the two is in the same plane to ensure the reliability of the welding. However, in order to weld packaging boxes of different sizes, multiple sets of welding tools corresponding to the sizes need to be prepared, which increases the cost of box welding.

[0003] The prior art generally compensates for the gap between the small-size packaging box welding tool and the larger-size packaging box by adding a pad block to the small-size packaging box welding tool. In this way, the same welding tool is used to weld packaging boxes of different sizes. Therefore, the height, number and installation position of the required pad block need to be designed in advance, which increases the workload of the welding operation. After welding is completed, the box and the pad block may be pressed tightly due to thermal expansion, making it difficult to disassemble the pad block and remove the box. Forced disassembly may also cause wear and tear to the box, reducing the efficiency and quality of the box welding operation. SUMMARY

[0004] The utility model aims at providing a top support structure to solve the problem of complex welding process, low welding efficiency and difficult disassembly of the box caused by using a pad block to compensate for the gap between the box welding auxiliary tool and the to-be-welded box of different sizes in the prior art. The utility model also provides an adjustable welding tool to solve the above technical problems and improve the efficiency and quality of the welding operation.

[0005] In order to achieve the above object, the utility model provides a roof support structure, including roof beam and setting in the left and right sides of roof beam's stand, the stand is equipped with the positioning support spare on the roof beam length direction guide activity installation, the positioning support spare has with the inside wall surface of the box body to be welded and fits in with the side support surface of the positioning support spare, with the upper end surface of the roof beam as the top support surface cooperation side support surface, for supporting the U type box body of cross section with welding of upside down in the roof support structure, the roof support structure still includes the propulsion structure, the propulsion structure promotes the positioning support spare and moves outward to adapt to the packing box of different size, the positioning support spare still is equipped with reset spring, to drive the positioning support spare reset.

[0006] Further, the positioning support piece includes a guide shaft and a positioning block, the guide shaft is movably arranged on the stand, and the positioning block is connected to an end of the guide shaft and located outside the stand; the propulsion structure includes a driven wedge and a driving wedge, the driven wedge is directly or indirectly connected to one end of the guide shaft located inside the stand, the driven wedge has a driven wedge surface, and the driven wedge surfaces of the two driven wedges on the two positioning support pieces are oppositely arranged; the driving wedge has a driving wedge surface matched with the driven wedge surfaces of the two oppositely arranged driven wedges; and the propulsion structure further includes a linear driving mechanism to drive the driving wedge to advance between the two driven wedge surfaces.

[0007] Further, the guide shafts of the positioning support pieces are arranged in groups and are spaced apart in the up-down direction, and one end of each group of guide shafts towards the inside of the stand is connected to a connecting end plate, and the driven wedge is connected to the middle part of the connecting end plate.

[0008] Further, the reset spring is sleeved on the guide shaft, and the two ends of the reset spring are respectively abutted against the stand and the connecting end plate.

[0009] Further, the linear driving mechanism is a lead screw nut mechanism, the screw hole matched with the lead screw in the lead screw nut mechanism is arranged on the driving wedge, and the driving wedge is prevented from rotating by the wedge surface between the two driven wedges.

[0010] Further, the lead screw is vertically arranged, and the propulsion structure further includes a reversing structure, the reversing structure includes a bevel gear pair connected with the lead screw, and the axis of the input bevel gear of the bevel gear pair is horizontally arranged and perpendicular to the roof beam.

[0011] Further, the connecting end plate and the roof beam are provided with a guide structure in the left-right direction.

[0012] Further, the guide structure includes a guide sliding block and a guide sliding rail, the guide sliding block is fixedly installed on the upper end surface of the connecting end plate, and the guide sliding rail is installed on the lower side surface of the roof beam.

[0013] Further, front and rear limit plates are arranged on the two end surfaces of the roof support structure in the front and rear directions, the height of the front and rear limit plates is consistent with the height of the driven wedge and covers the driven wedge.

[0014] Advantages:

[0015] The utility model discloses a kind of top support structures, including roof beam and the stand on the both sides of roof beam, two stands are all installed with the positioning support piece that can move along specific direction, positioning support piece has with the conformal surface of the inner wall surface shape of the box body to be welded;With the upper end surface of roof beam as top support surface, with the conformal surface of the box body to be welded of positioning support piece as side support surface, the box body to be welded is supported and positioned by one top support surface and two side support surfaces;Top support structure is also provided with propulsion structure, propulsion structure can promote positioning support piece to move outward and press the welding seam of the box body to be welded, so that welding seam keeps flush;Positioning support piece also includes reset spring, after propulsion structure is retracted, it can drive positioning support piece reset;By adjusting the telescopic length of limiting structure, the packaging box of different sizes can be adapted;After welding is completed, retraction propulsion structure, reset spring can drive positioning support piece reset, packaging box can be quickly taken down, avoid the method that the existing technology uses cushion block to compensate the distance between welding tool and the box body to be welded of different sizes, solve the problem that the packaging box welding tool of prior art is complex, and welding efficiency is low.

[0016] The utility model discloses still provide a kind of adjustable welding tool, including base, auxiliary support frame is installed on base, to support the box body to be welded of inverted buckling;Base is also installed with top support structure, the top support structure includes roof beam and the stand being set on the left and right sides of roof beam, positioning support piece is movably installed on stand along the length direction of roof beam, positioning support piece has with the side support surface of the inner wall surface of the box body to be welded conformal, with the upper end surface of roof beam as top support surface cooperation side support surface, to support the box body to be welded with the section of U type of inverted buckling on top support structure;Top support structure also includes propulsion structure, propulsion structure promotes positioning support piece to move outward to adapt the packaging box of different sizes;Positioning support piece is also provided with reset spring, to drive positioning support piece reset;Base is also provided with constraint frame support and constraint frame, constraint frame has with three outer side constraint surfaces of the outer profile of the box body to be welded conformal, after the box body to be welded is inverted buckling on auxiliary support frame, constraint frame is installed on the top of the box body to be welded, and the box body to be welded is provided with from outside to inside constraint.

[0017] Further, the positioning support piece includes a guide shaft and a positioning block, the guide shaft is movably arranged on the stand, and the positioning block is connected to an end of the guide shaft and located outside the stand; the propulsion structure includes a driven wedge and a driving wedge, the driven wedge is directly or indirectly connected to one end of the guide shaft located inside the stand, the driven wedge has a driven wedge surface, the driven wedge surfaces of the two driven wedges on the two positioning support pieces are oppositely arranged, the driving wedge has a driving wedge surface matched with the driven wedge surfaces of the two oppositely arranged driven wedges, and the propulsion structure further includes a linear driving mechanism to drive the driving wedge to advance between the two driven wedge surfaces.

[0018] Further, the guide shafts of the positioning support are arranged in groups and are spaced apart in the up-down direction, one end of the guide shafts of each group is connected with a connecting end plate, and the driven wedge blocks are connected to the middle part of the connecting end plate.

[0019] Further, the reset spring is sleeved on the guide shaft and is abutted against the column and the connecting end plate at two ends.

[0020] Further, the linear driving mechanism is a screw nut mechanism, the screw hole matched with the screw rod in the screw nut mechanism is arranged on the driving wedge block, and the driving wedge block is realized rotation-stopping through the wedge surface between the two driven wedge blocks.

[0021] Further, the screw rod is arranged vertically, and the pushing structure further comprises a reversing structure, the reversing structure comprises a bevel gear pair connected with the screw rod, and the axis of the input bevel gear of the bevel gear pair is arranged horizontally and perpendicularly to the top beam.

[0022] Further, the guide structure in the left-right direction is arranged between the connecting end plate and the top beam.

[0023] Further, the guide structure comprises a guide sliding block and a guide sliding rail, the guide sliding block is fixedly installed on the upper end face of the connecting end plate, and the guide sliding rail is installed on the lower side face of the top beam.

[0024] Further, the front and rear limiting plates are arranged on the front and rear end faces of the supporting structure, the height of the front and rear limiting plates is consistent with the height of the driven wedge block and covers the driven wedge block.

[0025] Beneficial effects:

[0026] The adjustable welding tool provided by the utility model is innovative, two sections of box bodies to be welded are inverted on the adjustable welding tool after being clamped on the adjustable welding tool, the top supporting structure can adjust the flush degree of the welding seams between the two sections of box bodies to be welded and compresses the welding seams of the box bodies to be welded from the inside to the outside, the base is further provided with a constraint frame support and a constraint frame, the constraint frame has three outer constraint surfaces matched with the outer surface of the box body to be welded, the outer constraint surfaces provide a constraint force from the outside to the inside to the box body to be welded, the bidirectional constraint from the inside and the outside ensures that the box body to be welded does not deform during welding, and the welding quality is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 Assembly structure main view of top support structure;

[0028] Figure 2 Assembly structure side view of top support structure;

[0029] Figure 3 Structure main view of top support structure when guide shaft is extended;

[0030] Figure 4 Structure main view of adjustable welding tool in working state;

[0031] Figure 5 Overall structure schematic view of adjustable welding tool;

[0032] Figure 6 Structure schematic view of adjustable welding tool after fixing to-be-welded box body;

[0033] Figure 7 Main view schematic view of to-be-welded box body;

[0034] Figure 8 Main view schematic view of to-be-welded box body end plate;

[0035] Figure 9 B-B sectional view schematic view of to-be-welded box body end plate.

[0036] In the figure: 1, top beam; 2, stand column; 3, positioning support; 301, guide shaft; 302, positioning block; 303, connecting end plate; 4, to-be-welded box body; 5, pushing structure; 501, driven wedge; 502, driving wedge; 6, reset spring; 7, guide structure; 701, guide slider; 702, guide slide rail; 8, shaft coupling; 9, lead screw; 10, hand wheel; 11, limiting plate; 12, base; 13, auxiliary support frame; 14, top support structure; 15, constraint frame support; 16, constraint frame; 18, bottom beam; 19, gear pair mounting box; 20, through hole; 21, to-be-welded box body end plate. DETAILED DESCRIPTION

[0037] The features and performances of the present application are described in further detail below in combination with embodiments.

[0038] The concept and principle of the present application are: the to-be-welded box body with U-shaped cross section is invertedly buckled on the base frame composed of top beam and stand column, the to-be-welded box body comprises Figures 7-9The U-shaped box body 4 to be welded and the box end plate 21 to be welded shown in the figure are provided with a length, and the column of the base frame is provided with a telescopic positioning support, the two positioning supports are matched with the upper end surface of the roof beam to support the box body 4 to be welded and the box end plate 21 to be welded, if the welding seams are not aligned, the limiting structure is extended, one of the two box bodies to be welded which are not aligned is pushed, the box body to be welded is pressed, the splicing seams of the two box bodies to be welded are aligned, and then the welding operation can be started, and after the welding is completed, the positioning support is retracted, and the welded packaging box can be quickly disassembled.

[0039] Based on the above principles and concepts, the utility model provides a top support structure and various embodiments thereof for further illustration.

[0040] In a basic embodiment, as Figures 1-6 provided in the embodiments, the base frame of the top support structure 14 is composed of the roof beam 1 and the columns 2 on both sides of the roof beam 1, the positioning support 3 is movably mounted on the column 2 along the length direction of the roof beam 1, the positioning support 3 has a side support surface which can be completely matched with the inner wall surface of the box body 4 to be welded and the box end plate 21 to be welded, the upper end surface of the roof beam 1 is used as a top support surface and is matched with the side support surface to support the box body 4 to be welded, the top support structure 14 further comprises a pushing structure 5 which is connected with the positioning support 3 and can move the positioning support 3 outward to adapt to the box body 4 to be welded of different sizes and press and align the welding seams of the box body 4 to be welded, and the positioning support 3 is further provided with a reset spring 6 to reset the positioning support 3 when the pushing structure 5 is retracted. In summary, the top support structure 14 provided by the utility model can assist in welding packaging boxes of various sizes by adjusting the telescopic length of the positioning support 3, after the welding operation is completed, the pushing structure 5 is retracted, and the welded packaging box can be quickly disassembled, the technical scheme of using a fixed-size welding tool matched with a pad to weld the box body in the prior art is avoided, the problems of complex operation of the packaging box welding tool and low packaging box welding efficiency in the prior art are solved, and the wear of the inner wall of the finished packaging box during disassembly of the packaging box is avoided.

[0041] On the basis of the above embodiments, in an embodiment, as Figures 1-6The provided embodiment, the positioning support 3 includes a guide shaft 301 worn on both sides of the column 2 and a positioning block 302 used to push and compress the welded box, the positioning block 302 is connected at the end of the guide shaft 301 outside the column, the shape of the positioning block 302 is consistent with the inner wall surface shape of the box to be welded 4 and the end plate 21 of the box to be welded, and the fitting surface of the positioning block 302 with the box to be welded 4 or the end plate 21 of the box to be welded is the above-mentioned side support surface; the pushing structure 5 includes a driven wedge 501 and a driving wedge 502, the driven wedge 501 is directly or indirectly connected at one end of the guide shaft 301 inside the column, the driven wedge 501 has a driven wedge surface, the driven wedge surfaces of the two driven wedges 501 connected on the two positioning supports 3 are oppositely arranged, the driving wedge 502 has two driving wedge surfaces matched with the driven wedge surfaces of the above-mentioned two driven wedges 501, the pushing structure 5 is further provided with a linear driving mechanism, the linear driving mechanism can move along the matching movement direction of the driving wedge 502 and the driven wedge 501, and the driving wedge 502 is driven by the linear driving mechanism to advance and retract between the driven wedge surfaces; in another embodiment, the positioning support 3 uses an H-shaped section bar, the H-shaped section bar passes through the column 2, one end of which is shaped to fit the inner wall surface of the box to be welded 4, and the other end is connected with the pushing structure 5, the H-shaped section bar is pushed as a whole by the pushing structure to press against the box to be welded 4, and the return spring 6 is installed between the plate material inside the base frame of the bracing structure 14 and the column 2.

[0042] On the basis of the above-mentioned embodiments, in one embodiment, as Figures 1-6 The provided embodiment, the guide shaft 301 of the positioning support 3 is arranged in groups and is spaced apart and worn on the column 2 in the up-down direction, one end of the guide shaft 301 in the group towards the inside of the column is connected with a connecting end plate 303, the driven wedge 501 is installed on the connecting end plate 303 and is at the middle position of the connecting end plate 303, so as to uniformly advance the guide shaft 301 arranged in groups; in another embodiment, the positioning support 3 is only provided with one guide rod which is thick enough, the driven wedge 501 is directly connected on the end surface of the guide rod towards the inside of the column 2, wherein, in order to avoid the circumferential rotation of the guide rod, the guide rod is selected as a non-cylindrical guide rod, and a through hole corresponding to the guide rod is arranged on the column to limit the movement of the guide rod.

[0043] On the basis of the above-mentioned embodiments, in one embodiment, as Figures 1-6In the provided embodiment, the reset spring 6 is a compression spring, which is sleeved on the guide shaft 301, one end of which is pressed against the stand 2, and the other end is pressed against the connecting end plate 303. When the advancing structure 5 pushes the positioning support 3 to the two sides, the reset spring 6 is compressed, and when the advancing structure 5 is retracted, the reset spring 6 pushes the connecting end plate 303 and drives the positioning support 3 to reset as a whole. In another embodiment, the reset spring 6 is a tension spring, which is arranged between the two connecting end plates 303. When the advancing structure 5 pushes the positioning support 3 to the two sides, the reset spring 6 is stretched, and when the advancing structure 5 is retracted, the reset spring 6 pulls the connecting end plate 303 to retract and drives the positioning support 3 to reset as a whole.

[0044] On the basis of the above-mentioned embodiments, in one embodiment, as shown in Figures 1-6 In the provided embodiment, the linear drive mechanism connected with the driving wedge 502 is a lead screw nut mechanism, in which the screw hole matched with the lead screw 9 is arranged on the driving wedge 502, and the rotation of the driving wedge 502 is limited by the wedge surfaces of the two driven wedges 501. In another embodiment, a linear motor can also be used as the linear drive mechanism, which is fixedly connected with the driving wedge 502 to remotely control the lifting height of the driving wedge 502.

[0045] On the basis of the above-mentioned embodiments, in one embodiment, as shown in Figures 1-6 In the provided embodiment, the lead screw 9 is arranged vertically, and the advancing structure 5 further comprises a reversing structure, which comprises a bevel gear pair connected with the lead screw. The axis of the input bevel gear in the bevel gear pair is arranged horizontally and perpendicular to the roof beam 1. The lead screw 9 is connected with the gear shaft of the output bevel gear through the shaft coupling 8. A bottom beam 18 is further arranged between the two side stands 2. The bottom beam 18 is provided with a gear pair mounting box 19, and the bevel gear pair is mounted in the gear pair mounting box 19. The gear shaft of the input bevel gear passes through the wall of the gear pair mounting box 19 and is provided with a hand wheel 10 on the shaft segment outside the wall, which facilitates the input of torque to the gear pair. In another embodiment, the gear shaft of the input bevel gear passes through the gear pair mounting box 19 and is connected with a stepping motor, and the torque is remotely controlled by the handle matched with the stepping motor.

[0046] On the basis of the above-mentioned embodiments, in one embodiment, as shown in Figures 1-6 In the provided embodiment, the left-right oriented guide structure 7 is further arranged between the connecting end plate 303 and the roof beam 1, which limits the movement direction of the connecting end plate 303 along the guide structure 7, and ensures the stability of the movement of the positioning support 3.

[0047] On the basis of the above-mentioned embodiments, in one embodiment, as shown in Figures 1-6In the provided embodiment, the guide structure 7 includes guide sliders 701 fixed on the connecting end plate 303 and guide rails 702 fixed on the lower side of the roof beam 1, and the guide sliders 701 and the guide rails 702 are matched through the recesses on the guide sliders 701 and the protrusions on the guide rails 702 to ensure the stability of the movement of the guide sliders 701; in another embodiment, the lower side of the roof beam 1 is provided with left-right guide grooves, the width of the guide grooves is consistent with the connecting end plate 303, and the upper end of the connecting end plate 303 is clamped in the guide grooves and moves along the guide grooves.

[0048] On the basis of the above-mentioned embodiments, in one embodiment, as shown in Figure 1 、 Figure 2 In the provided embodiment, the front and rear sides of the roof support structure 14 are both provided with limiting plates 11, the height of the limiting plates 11 is consistent with the height of the driven wedge 501, and the limiting plates 11 are in close contact with the driven wedge 501 to ensure that the driven wedge 501 will not displace in the front and rear directions; in another embodiment, the height of the limiting plates 11 can be greater, enough to cover the front and rear end faces of the base frame of the roof support structure 14, which can limit the displacement of the driven wedge 501 and protect other elements installed inside the base frame.

[0049] The utility model further provides an embodiment of an adjustable welding tool for further illustration.

[0050] In one embodiment, as shown in Figures 4-6 In the provided embodiment, the adjustable welding tool includes a base 12, the base 12 is provided with an auxiliary support frame 13 for supporting the longer box body section of the box body 4 to be welded; the base is also provided with a roof support structure 14, the roof support structure 14 is the roof support structure described in the above-mentioned embodiments, and will not be described in detail herein; the base 12 is also provided with a constraint frame support 15 for installing a constraint support 16, the constraint support 16 has three outer side constraint surfaces in close contact with the outer side of the box body to be welded, and provides a constraint force from the outside to the inside of the box body 4 through the outer side constraint surfaces to prevent the box body from deforming during welding.

[0051] As shown in Figures 1-6As shown, the adjustable welding tool provided by the utility model is used, the box body 4 with welding is inverted on the plurality of auxiliary support frames 13 horizontally arranged on the base 12, the two ends of the box body 4 to be welded are arranged on the top support structure 14 and welded with another box body 4 with welding or the box end plate to be welded, the hand wheel 10 is rotated, the positioning support 3 is stretched out and presses the welding seam of the two pieces to be welded, so as to guarantee the flush of the welding seam and provide the constraint force from inside to outside for the plate piece at the welding seam; after the box body 4 to be welded is fixed, the constraint bracket 16 is installed on the upper end of the box body to be welded, the constraint bracket 16 is fixed on the constraint frame bracket 15 by the fastening bolt passing through the through hole arranged on the constraint bracket 16 and cooperating with the threaded hole arranged on the constraint frame bracket 15, the constraint force from outside to inside is provided for the box plate piece near the welding seam of the box body 4 to be welded, the deformation of the packaging box during welding is strictly guaranteed; after welding is completed, the constraint bracket 16 is removed, the hand wheel 10 is rotated, and the positioning support 3 is retracted, so that the packaging box body after welding can be quickly disassembled, the welding work of the packaging box is simplified, and the efficiency of the packaging box welding operation is improved.

[0052] The above is only the preferred embodiment of the utility model and does not limit the utility model, the patent protection scope of the utility model is subject to the claims, and equivalent structural changes made by referring to the contents of the specification and drawings of the utility model should also be included in the protection scope of the utility model.

Claims

1. A roof support structure, characterized by The top beam and the columns arranged on the left and right sides of the top beam, the positioning support movably mounted on the columns along the length direction of the top beam, the positioning support having a side support surface abutting with the inner wall surface of the box to be welded, the upper end surface of the top beam serving as a top support surface cooperating with the side support surface to support the U-shaped box to be welded which is invertedly buckled on the top support structure; the top support structure further comprises a pushing structure which pushes the positioning support to move outward to adapt to the packaging boxes of different sizes; the positioning support is further provided with a reset spring to drive the positioning support to reset.

2. A roof support structure according to claim 1, wherein The positioning support comprises a guide shaft movably arranged on the column and a positioning block connected to the end of the guide shaft and located outside the column, the pushing structure comprises a driven wedge block and a driving wedge block, the driven wedge block is directly or indirectly connected to one end of the guide shaft located inside the column, the driven wedge block has a driven wedge surface, the driven wedge surfaces of the two driven wedge blocks on the two positioning supports are oppositely arranged, the driving wedge block has a driving wedge surface cooperating with the driven wedge surfaces of the two oppositely arranged driven wedge blocks, and the pushing structure further comprises a linear driving mechanism to drive the driving wedge block to advance between the two driven wedge surfaces.

3. A roof support structure according to claim 2, wherein The guide shafts of the positioning supports are arranged in groups and are spaced apart in the up-down direction, and one end of the guide shafts of the groups towards the inside of the column is connected to a connecting end plate, and the driven wedge block is connected to the middle part of the connecting end plate.

4. A roof support structure according to claim 3, wherein The reset spring is sleeved on the guide shaft, and the two ends are respectively abutted against the column and the connecting end plate.

5. A roof support structure according to any one of claims 2 to 4, wherein, The linear driving mechanism is a lead screw nut mechanism, and the screw hole cooperating with the lead screw in the lead screw nut mechanism is arranged on the driving wedge block, and the driving wedge block is realized to be rotationally stopped by cooperating with the wedge surfaces between the two driven wedge blocks.

6. A roof support structure according to claim 5, wherein The lead screw is vertically arranged, and the pushing structure further comprises a reversing structure, the reversing structure comprises a bevel gear pair connected with the lead screw, and the axis of the input bevel gear of the bevel gear pair is horizontally arranged and perpendicular to the top beam.

7. A roof support structure according to claim 3 or 4, wherein, The connecting end plate and the top beam are provided with a guiding structure in the left-right direction.

8. A roof support structure according to claim 7, characterised in that The guiding structure comprises a guiding slider and a guiding rail, the guiding slider is fixedly installed on the upper end surface of the connecting end plate, and the guiding rail is installed on the lower side surface of the top beam.

9. A roof support structure according to any one of claims 2 to 4, wherein, Front and rear limit plates are arranged on the two end surfaces of the top support structure in the front-back direction, the height of the front and rear limit plates is consistent with the height of the driven wedge block and covers the driven wedge block.

10. An adjustable welding fixture characterized by, The base is provided with an auxiliary support frame for supporting the invertedly buckled box to be welded, a top support structure is further installed on the base, the top support structure is the top support structure according to any one of claims 1-9, a constraint frame support and a constraint frame are further arranged on the base, the constraint frame has three outer constraint surfaces abutting with the outer contour of the box to be welded, after the box to be welded is invertedly buckled on the auxiliary support frame, the constraint frame is installed on the top of the box to be welded, and the constraint frame provides constraint from the outside to the inside of the box to be welded.

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