Roof large component overhead assembly welding tool

Abstract

This invention discloses a top-view welding fixture for a large vehicle roof component, comprising a base frame; multiple first and second roof positioning components fixedly connected to the base frame at intervals; the first roof positioning component has a first positioning plate for conformally supporting the roof in reverse, the positioning surface of the first positioning plate having a concave arc structure that contacts the outer surface of the roof; the second roof positioning component includes a roof side plate positioning component and a fan base support component; the roof side plate positioning component has a side positioning surface; the top of the fan base support component forms a positioning plane; in the working state, the multiple first and second roof positioning components are integrated on the base frame and synchronously support the roof in reverse along the length of the roof, so that the operator can view the inner surface of the roof from the ground and from inside the roof in the reversed state. This fixture effectively reduces the labor intensity and operational difficulty of the operator, and has the advantages of good versatility, no limitation on the site of use, and high welding quality.

Description

Technical Field

[0001] This invention relates to the field of assembly and welding auxiliary tooling for rail transit vehicle body components, and particularly to a top-view welding tooling for large roof components. Background Technology

[0002] Currently, in the production of rail vehicles, the assembly and welding of stainless steel roof steel structures mainly adopts an upward-viewing assembly method. This includes the assembly and welding of some small parts. This operation method results in high labor intensity for the workers. Both the assembly and welding of the parts can easily cause fatigue. Moreover, the deformation generated during the roof welding process can easily cause the ends to lift up, causing the parts to detach from the tooling. In order to prevent the parts from detaching from the tooling after deformation, a pull-down device is required. At the same time, this welding method cannot control the overall curvature of the outer surface of the roof steel structure. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a top-view welding fixture for large roof components, which solves the problem of bottom-view assembly and welding of stainless steel roof structures. This fixture ensures the width, height, and other dimensions of the roof, as well as the curvature of the outer surface of the roof. At the same time, it converts the assembly and welding of small roof steel structure components to a top-view position, reducing the labor intensity of the workers while ensuring the assembly and welding dimensions. It has good versatility, reduces the requirements of the fixture for the site, and achieves the purpose of universal deployment in different locations.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] This invention discloses a top-view welding fixture for assembling large components on a vehicle roof, comprising:

[0006] The underframe extending along the length of the vehicle roof;

[0007] Multiple spaced-apart components are fixed to the underframe, including a first roof positioning assembly and a second roof positioning assembly.

[0008] The first roof positioning assembly has a first positioning plate for conforming reverse support of the roof, and the positioning surface of the concave arc structure of the first positioning plate is in contact with the outer surface of the roof.

[0009] The second roof positioning component includes a roof side panel positioning component and a fan base support component;

[0010] The roof side panel positioning assembly has a side positioning surface for contacting the outer surfaces of both sides of the roof.

[0011] The top of the fan base support assembly forms a positioning plane for contacting the surface of the roof fan base;

[0012] In operation, multiple first and second roof positioning components are integrated on the chassis and synchronously support the roof in the opposite direction along the length of the roof, so that the operator can look down at the inner surface of the roof from the ground and inside the roof in the reversed position.

[0013] Furthermore, the base frame includes two parallel transition devices, and several basic frames are fixedly connected between the two transition devices to provide an installation platform.

[0014] Furthermore, the transition device includes several transition beams and end plates fixed to both ends of the transition beams;

[0015] The transition beam has a groove inside, an embedded nut is installed in the groove, and an elongated hole is opened on the upper surface of the transition beam corresponding to the position of the groove.

[0016] The two adjacent transition beams are fixedly connected by the end plate to extend the length of the transition device.

[0017] Furthermore, the basic frame includes a beam, a foundation positioning plate welded to the top of the beam, and a foundation base plate welded to the bottom wall. The width of the foundation base plate is greater than the width of the beam, and mounting holes are provided at both ends of the foundation base plate.

[0018] Furthermore, the first roof positioning component includes the first positioning plate, the first positioning seat, and the second positioning seat;

[0019] The top of the first positioning plate is provided with positioning blocks at intervals on the side of the positioning surface, and the positioning blocks are in contact with the outer surface of the vehicle roof.

[0020] Each of the first positioning plates is fixedly connected to a second positioning seat below the positioning block. The second positioning seat is threadedly connected to an adjusting rod and contacts the positioning block through the adjusting rod.

[0021] The first positioning plate is equipped with sliders at both ends, which contact the side of the vehicle roof.

[0022] The first positioning plate has a T-shaped first positioning seat installed at its bottom.

[0023] Furthermore, it also includes a support structure with an I-shaped form;

[0024] The support structure includes a base plate and a top plate, as well as two upright plates connected between the base plate and the top plate. Both the base plate and the top plate have elongated holes on both sides to provide installation interfaces.

[0025] Furthermore, the fan base support assembly includes a screw rod that is fixedly connected to the base;

[0026] The screw is threadedly connected to a screw sleeve, and a positioning nut is also fitted on the screw to lock the position of the screw sleeve. The top of the screw sleeve has a positioning plane that contacts the surface of the roof fan base.

[0027] Furthermore, the roof side panel positioning assembly includes a second positioning plate, a third positioning seat, and a fourth positioning seat;

[0028] The second positioning plate has a concave arc structure on one side of its top, and a side positioning block is installed on one side of the second positioning plate, which contacts the outer surfaces of both sides of the roof through the side positioning block.

[0029] The second positioning plate is fixedly connected to a fourth positioning seat below the side positioning block. The fourth positioning seat is threadedly connected to a side adjusting rod and contacts the side positioning block through the side adjusting rod.

[0030] The bottom of the second positioning plate is equipped with a side slider, which contacts the side of the vehicle roof.

[0031] The third positioning seat, which has a T-shaped structure, is installed at the bottom of the second positioning plate.

[0032] Furthermore, it also includes a cable assembly, with the cable assembly installed at both ends of the base frame, which is used to locate the position of the roof edge line and the center line.

[0033] Furthermore, the pull wire assembly includes a pull wire base plate fixedly connected to the pull wire base plate, and a pull wire guide post is fitted on the pull wire base plate;

[0034] A connecting plate is fixedly connected to the top of the pull wire guide post. A V-shaped center seat is fixedly connected to one side of the connecting plate, and a pull wire bolt is horizontally threaded to the other side through the pull wire support.

[0035] In the above technical solution, the welding fixture for assembling large components on a roof, viewed from above, provided by the present invention has the following advantages:

[0036] The overhead welding fixture for large roof components designed in this invention transforms the work from a bottom-view operation to an overhead-view operation. This reduces the labor intensity of workers while better ensuring the length, width, and height dimensions of the roof, and also ensuring the curvature and flatness of the roof's outer arc surface. It also facilitates the achievement of downward deflection at both ends during vehicle assembly.

[0037] The height, length, width, and position of each positioning component of the tooling can be adjusted without restriction, and the curvature can also be fine-tuned using positioning blocks. Soft pads are used to contact the outer surface of the roof to avoid scratching the outer surface. The overall tooling has a modular structure, and the various parts and components mentioned above can be replaced as needed to further adapt to the production of roofs with more lengths, widths, and heights.

[0038] The basic component of the tooling is a modular structure that can be disassembled and interchanged, allowing for free assembly. No dedicated site is required.

[0039] The workers are positioned inside the roof, which naturally promotes the required longitudinal deflection of the roof, reducing the need for tooling clamping and decreasing costs and operating procedures. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0041] Figure 1 This is a schematic diagram of the cross-section of the steel structure of the vehicle roof along its length in the prior art;

[0042] Figure 2 This is a top view of the steel structure of the vehicle roof in existing technology;

[0043] Figure 3 This is a cross-sectional view (AA) of the steel structure of the vehicle roof in the prior art;

[0044] Figure 4 This is a BB sectional view of the steel roof structure in the prior art;

[0045] Figure 5 This is a top view of the welding fixture for a large vehicle roof component disclosed in this invention.

[0046] Figure 6 This invention discloses a top view of a welding fixture for assembling a large component on a vehicle roof.

[0047] Figure 7 yes Figure 6 AA section view;

[0048] Figure 8 yes Figure 7 E-direction view;

[0049] Figure 9 yes Figure 8 A magnified view of a portion of the image;

[0050] Figure 10 yes Figure 6 BB section view;

[0051] Figure 11 yes Figure 6 CC section view;

[0052] Figure 12 yes Figure 5 DD sectional view;

[0053] Figure 13 This is a top view of a welding tooling transition device for a large vehicle roof component, as disclosed in this invention.

[0054] Figure 14 This is a top view of a welding tooling transition device for a large vehicle roof component disclosed in this invention.

[0055] Figure 15 This is a top view of the basic frame of the welding fixture for a large vehicle roof component disclosed in this invention.

[0056] Figure 16 This is a top view of the basic frame of the welding fixture for a large component on the roof, as disclosed in this invention.

[0057] Figure 17 yes Figure 16 AA section view;

[0058] Figure 18 yes Figure 16 BB section view;

[0059] Figure 19 This is a top view of the first roof positioning assembly of a welding fixture for a large roof component disclosed in this invention;

[0060] Figure 20 This is a left view of the first roof positioning assembly of a top-view welding fixture for a large vehicle roof component disclosed in this invention;

[0061] Figure 21 This is a top view of the first roof positioning assembly of a welding fixture for a large roof component disclosed in this invention;

[0062] Figure 22 This is a top view of a welding fixture bracket for a large vehicle roof component, as disclosed in this invention.

[0063] Figure 23 This invention discloses a top view of a large vehicle roof component assembly welding fixture bracket.

[0064] Figure 24 This is a top view of the fan base support assembly of a large vehicle roof component, as disclosed in this invention.

[0065] Figure 25This is a top view of the assembly and welding fixture for positioning the roof side panel of a large vehicle roof component disclosed in this invention.

[0066] Figure 26 This is a top view of a large vehicle roof component assembled with welding fixtures and wires, as disclosed in this invention.

[0067] Figure 27 This is a left view of a top view of a large vehicle roof component assembled with welding fixtures and wires, as disclosed in this invention.

[0068] Figure 28 This invention discloses a top view of a large vehicle roof component assembled with welding fixtures and wires.

[0069] Explanation of reference numerals in the attached figures:

[0070] Base frame 10: Basic frame 11: Crossbeam 111; Longitudinal beam 112; Basic positioning plate 113; Basic connecting plate 1131; Pressure block 1132; Pad plate 114; Basic base plate 115; Adjusting pad 1151; Connecting bolt 1152; Support bolt 1153; Reinforcing beam 116; Transition device 12; Transition beam 121; Long slot 122; Slide groove 123; End plate 124; Embedded nut 125;

[0071] First roof positioning component 20a; first positioning plate 21; first positioning seat 22; second positioning seat 23; positioning block 24; adjusting rod 25; slider 26;

[0072] The second roof positioning component is 20b;

[0073] 30 is a support frame; 31 is a support frame base plate; 32 is a support frame upright plate; and 33 is a support frame top plate.

[0074] Roof side panel positioning component 40; second positioning plate 41; third positioning seat 42; fourth positioning seat 43; side positioning block 44; side adjusting rod 45; side slider 46;

[0075] The fan base support consists of: 50; screw 51; screw sleeve 52; positioning nut 53; and seat 54.

[0076] Guy wire assembly 60; Guy wire base plate 61; Guy wire upright 62; Guy wire guide post 63; Connecting plate 64; Center seat 65; Guy wire support 66; Guy wire bolt 67;

[0077] Positioning surface 100;

[0078] Side positioning surface 200;

[0079] Positioning plane 300. Detailed Implementation

[0080] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0081] See Figure 5-12 As shown:

[0082] An invention provides a top-view welding fixture for assembling large components on a vehicle roof, comprising:

[0083] A chassis 10 extending along the length of the roof;

[0084] Multiple spaced components are fixed to the base frame 10, including a first roof positioning assembly 20a and a second roof positioning assembly 20b.

[0085] The first roof positioning assembly 20a has a first positioning plate 21 for conformally supporting the roof in a reverse direction, and the positioning surface 100 of the concave arc structure of the first positioning plate 21 is in contact with the outer surface of the roof (e.g., ...). Figure 7 , 19 (as shown)

[0086] The second roof positioning component 20b includes the roof side panel positioning component 40 and the fan base support component 50.

[0087] The roof side panel positioning assembly 40 has a side positioning surface 200 for contacting the outer surfaces of both sides of the roof.

[0088] The top of the fan base support assembly 50 forms a positioning plane 300 for contacting the surface of the fan base on the vehicle roof (e.g., Figure 10 (as shown)

[0089] In the working state, multiple first roof positioning components 20a and second roof positioning components 20b are integrated on the base frame 10 and synchronously support the roof in the opposite direction along the length of the roof, so that the operator can look down at the inner surface of the roof from the ground and inside the roof in the reversed state.

[0090] This tooling allows for the assembly and internal welding of roof components using a top-down view. The assembly process involves first laying corrugated sheets, then laying side roof panels; after securing the corrugated sheets to the side roof panels, installing the air conditioning unit bracket and the roof curved beam; and finally, installing the roof side beams. The original roof assembly process involved first assembling the side beams and side roof panels, then marking lines to assemble the roof curved beams, and finally assembling the air conditioning unit bracket. After securing the components, the corrugated sheets were laid and secured. Furthermore, the original process involved a bottom-up view assembly, requiring manual lifting of components. The new process assembles components on a reverse assembly platform, placing them on the surface to eliminate the need for lifting, significantly reducing labor intensity and improving safety.

[0091] After assembly, the structural welding of large components is carried out. After welding, various small components of the roof are assembled in the reverse assembly position. The components are assembled in a placement manner, without the need to lift the components, which is easy to operate and makes it easier to ensure welding quality. Welding is carried out in the (PA, PB) positions, which greatly reduces the welding difficulty. The original process used relatively difficult bottom-view positions (PD, PE) welding, and the welding personnel operated by holding the welding torch.

[0092] The tooling is operated from a top-down position, offering a wide field of vision with minimal obstruction. Workers operate inside the inverted roof, with the roof's steel structure itself serving as support. Pre-set deflections within the tooling allow for longitudinal deflection during component assembly and welding, naturally generating pressure on the roof from the workers. No additional tooling pressure is needed to achieve the required deflection. Furthermore, the tooling is modular, allowing for adjustments in height, width, and length. The curved positioning blocks can also be adjusted in angle and position to accommodate various vehicle models with different curvatures and lengths. The support structure is also modular, requiring no special site conditions during installation.

[0093] See Figure 5 , 6 As shown:

[0094] Preferably, the chassis 10 includes two parallel transition devices 12, and a plurality of base frames 11 are fixedly connected between the two transition devices 12 to provide an installation platform so that the chassis 10 can be fixedly installed with the first roof positioning assembly 20a or the second roof positioning assembly 20b through the base frames 11. Of course, other devices can also be used. The chassis 10 does not need to be connected to the foundation of the site. The first roof positioning assembly 20a or the second roof positioning assembly 20b can be arranged in any number at any position on the chassis 10 through the base frames 11 according to the design structural requirements.

[0095] See Figure 12-14 As shown:

[0096] Preferably, the transition device 12 includes a plurality of transition beams 121 and end plates 124 fixedly connected to both ends of the transition beams 121;

[0097] The transition beam 121 has a groove 123 inside, and an embedded nut 125 is installed in the groove 123. The upper surface of the transition beam 121 has an elongated hole 122 corresponding to the position of the groove 123.

[0098] The two adjacent transition beams 121 are fixedly connected by end plates 124 to extend the length of the transition device 12.

[0099] Specifically, in this structure, the transition device 12 includes several transition beams 121. The transition beams 121 can be channel steel in the prior art. Each transition beam 121 has end plates 124 welded to both ends. The end plates 124 have mounting holes. Adjacent transition beams 121 are fixedly connected through the end plates 124, thereby extending the overall length of the transition device 12 so that the transition device 12 can adapt to the length of the roof and ensure that the tooling can be used for roofs of different lengths (i.e., the tooling meets the requirements of any length dimension in the length direction).

[0100] The transition beam 121 has concave grooves 123 welded at intervals along its length. An embedded nut 125 is installed in the groove 123. The upper surface of the transition beam 121 has an elongated hole 122 corresponding to the groove 123, which facilitates the assembly of the base frame 11 onto the transition beam 121. During assembly, the mounting bolts can pass through the elongated hole 122 and connect with the embedded nut 125. At the same time, the fixed position can be adjusted through the elongated hole 122, making assembly and adjustment convenient.

[0101] See Figure 15-18 As shown:

[0102] Preferably, the foundation frame 11 includes a beam, a foundation positioning plate 113 welded to the top of the beam, and a foundation base plate 115 welded to the bottom wall. The width of the foundation base plate 115 is greater than the width of the beam, and mounting holes are provided at both ends of the foundation base plate 115.

[0103] Specifically, the beams of the basic frame 11 can be formed by cutting channel steel to form horizontal beams 111 and longitudinal beams 112 and then welding them together. A reinforcing beam 116 and a pad plate 114 are welded in the middle of the beam. A foundation plate 115 is welded at both ends and the center of the bottom of the beam. The foundation plate 115 has mounting holes at both ends. A foundation positioning plate 113 is welded at the top of the beam. A first roof positioning assembly 20a or a second roof positioning assembly 20b or other devices are installed on the foundation positioning plate 113.

[0104] Among them, see Figure 8 , 9 As shown, on the upper part of the basic frame 11, the basic positioning plate 113 is equipped with basic connecting plates 1131 at both ends, and is connected to the first roof positioning assembly 20a or the second roof positioning assembly 20b through the basic connecting plates 1131. Pressure blocks 1132 are installed at both ends of the basic connecting plate 1131.

[0105] The base connecting plate 1131 and the pressure block 1132 can be fixed at any position on the base frame 11 by fastening bolts. The first roof positioning component 20a, the second roof positioning component 20b and other tooling components are fixed on 1131 by bolts and other fasteners. The fixed positions of the first roof positioning component 20a and the second roof positioning component 20b can be adjusted arbitrarily on the base frame 11.

[0106] Among them, see Figure 12 As shown, at the lower part of the base frame 11, one mounting hole of the base plate 115 at both ends is fitted with a connecting bolt 1152, and the other mounting hole is fitted with a support bolt 1153. During assembly, the support bolt 1153 abuts against the transition device 12 to control the height of the base frame 11 and finely adjust the angle of the base plate 115, so that the base plate 115 remains horizontal, thereby keeping the transition device 12 and the roof side plate positioning assembly 40 in a vertical state. An adjusting pad 1151 is placed between the base plate 115 and the transition device 12. The connecting bolt 1152 passes through the adjusting pad 1151 and is threadedly connected to the embedded nut 125 of the transition device 12. That is to say, during assembly, the height and level of the base frame 11 are controlled by the support bolt 1153, and the position between the base frame 11 and the transition device 12 is fixed by the connecting bolt 1152.

[0107] See Figure 19-21 ;

[0108] Preferably, the first roof positioning assembly 20a includes a first positioning plate 21, a first positioning seat 22, and a second positioning seat 23;

[0109] Positioning blocks 24 are installed at intervals on the top of the first positioning plate 21 on the side of the positioning surface 100, and the positioning blocks 24 contact the outer surface of the vehicle roof. Specifically, the positioning blocks 24 have elongated holes, and the first positioning plate 21 has threaded holes. The mounting bolts pass through the elongated holes of the positioning blocks 24 and connect with the threaded holes of the first positioning plate 21. The positioning blocks 24 can be adjusted in posture when assembled with the first positioning plate 21 through the elongated holes.

[0110] Among them, the first positioning plate 21 is located below the positioning block 24 and is fixedly connected to the second positioning seat 23. The second positioning seat 23 is threadedly connected to the adjusting rod 25. The adjusting rod 25 contacts the positioning block 24. In use, the height and angle of the positioning block 24 can be finely adjusted by adjusting the adjusting rod 25.

[0111] The first positioning plate 21 is equipped with sliders 26 at both ends, which contact the roof side panel. Specifically, the slider 26 has an elongated hole. During assembly, two mounting bolts pass through the elongated hole on the slider 26 and are threaded to the first positioning plate 21. The position of the slider 26 can be adjusted arbitrarily as needed.

[0112] The bottom of the first positioning plate 21 is equipped with a first positioning seat 22 with a T-shaped structure; specifically, the first positioning seat 22 includes a vertical plate and a connecting plate welded to the bottom of the vertical plate. The vertical plate is connected to the first positioning plate 21 by bolts, and the connecting plate is connected to the base frame 11 by bolts. The mounting holes opened on the vertical plate and the connecting plate can be elongated holes to facilitate adjustment of the installation position.

[0113] See Figure 22-23 As shown:

[0114] Preferably, the tooling also includes a support frame 30 with an I-shaped structure;

[0115] The support assembly 30 includes a support base plate 31 and a support top plate 33, as well as two support uprights 32 connected between the support base plate 31 and the support top plate 33. The support base plate 31 and the support top plate 33 are provided with elongated holes on both sides to provide installation interfaces for assembly with the base frame 11 and the fan base support assembly 50. Specifically, the top of the support assembly 30 is fixedly connected to the fan base support assembly 50 through the elongated holes using fasteners, and the bottom is fixedly connected to the base positioning plate 113 of the base frame 11. The connection method is the same as the connection method between the first roof positioning assembly 20a or the second roof positioning assembly 20b and the base positioning plate 113, so that the installation position is not restricted.

[0116] See Figure 24 As shown:

[0117] Preferably, the fan base support assembly 50 includes a base 54 and a screw 51 fixedly connected to the base 54;

[0118] The base 54 and the bracket are fixedly connected to each other; specifically, the base 54 is fixedly connected to the top plate 33 of the bracket.

[0119] The screw 51 is threadedly connected to the screw sleeve 52. The screw 51 is also fitted with a positioning nut 53, which locks the position of the screw sleeve 52. The top of the screw sleeve 52 has a positioning plane 300, which contacts the surface of the roof fan base.

[0120] See Figure 25 As shown:

[0121] Preferably, the roof side panel positioning assembly 40 includes a second positioning plate 41, a third positioning seat 42, and a fourth positioning seat 43;

[0122] The second positioning plate 41 has a concave arc structure side positioning surface 200 on one side of its top. The second positioning plate 41 is equipped with a side positioning block 44 on one side of the side positioning surface 200. The side positioning block 44 contacts the outer surfaces of both sides of the roof. Specifically, the side positioning block 44 has an elongated hole, and the second positioning plate 41 has a threaded hole. The mounting bolt passes through the elongated hole of the positioning block 24 and connects with the threaded hole on the second positioning plate 41. The side positioning block 44 can be adjusted in posture when assembled with the second positioning plate 41 through the elongated hole.

[0123] Among them, the second positioning plate 41 is located below the side positioning block 44 and is fixedly connected to the fourth positioning seat 43. The fourth positioning seat 43 is threadedly connected to the side adjustment rod 45. The side adjustment rod 45 contacts the side positioning block 44. In use, the height of the side positioning block 44 can be finely adjusted and the angle can be finely adjusted through the side adjustment rod 45.

[0124] The bottom of the second positioning plate 41 is equipped with a side slider 46, which contacts the side of the roof. Specifically, the side slider 46 has the same structure as the slider 26, which will not be described in detail here.

[0125] The bottom of the second positioning plate 41 is equipped with a third positioning seat 42 with a T-shaped structure; specifically, the third positioning seat 42 has the same structure as the first positioning seat 22, and will not be described in detail here.

[0126] See Figure 26-28 As shown:

[0127] Preferably, the tooling also includes a cable assembly 60, with cable assemblies 60 arranged at both ends of the base frame 10, and the cable assemblies 60 are used to position the edge line and center line of the vehicle roof.

[0128] Preferably, the pull wire assembly 60 includes a pull wire base plate 61 fixedly connected to a pull wire column 62 on the pull wire base plate 61, and a pull wire guide post 63 is fitted on the pull wire column 62;

[0129] A connecting plate 64 is fixedly connected to the top of the pull wire guide post 63. A V-shaped center seat 65 is fixedly connected to one side of the connecting plate 64, and a pull wire bolt 67 is horizontally threadedly connected to the other side through the pull wire support 66.

[0130] Specifically, in this structure, during assembly, the pull wire assembly 60 is fixedly connected to the base frame 11 via the pull wire base plate 61. A hollow pull wire column 62 is fixedly connected to the upper part of the pull wire base plate 61. The pull wire guide column 63 has an elongated hole along the height direction, and the pull wire column 62 has a through hole. The pull wire guide column 63 can be installed in the pull wire column 62 with adjustable height, and the pull wire guide column 63 and the pull wire column 62 are fixedly connected by bolt assembly.

[0131] In the above technical solution, the welding fixture for assembling large components on a roof, viewed from above, provided by the present invention has the following advantages:

[0132] The overhead welding fixture for large roof components designed in this invention transforms the work from a bottom-view operation to an overhead-view operation. This reduces the labor intensity of workers while better ensuring the length, width, and height dimensions of the roof, and also ensuring the curvature and flatness of the roof's outer arc surface. It also facilitates the achievement of downward deflection at both ends during vehicle assembly.

[0133] The height, length, width, and position of each positioning component of the tooling can be adjusted without restriction, and the curvature can also be fine-tuned using positioning blocks. Soft pads are used to contact the outer surface of the roof to avoid scratching the outer surface. The overall tooling has a modular structure, and the various parts and components mentioned above can be replaced as needed to further adapt to the production of roofs with more lengths, widths, and heights.

[0134] The basic component of the tooling is a modular structure that can be disassembled and interchanged, allowing for free assembly. No dedicated site is required.

[0135] The workers are positioned inside the roof, which naturally promotes the required longitudinal deflection of the roof, reducing the need for tooling clamping and decreasing costs and operating procedures.

[0136] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A top assembly overhead assembly jig, characterized by, include: The underframe (10) extends along the length of the roof. A first roof positioning assembly (20a) and a second roof positioning assembly (20b) are fixedly connected at intervals to the underframe (10). The first roof positioning assembly (20a) has a first positioning plate (21) for conforming reverse support of the roof, and the positioning surface (100) of the concave arc structure of the first positioning plate (21) is in contact with the outer surface of the roof; The second roof positioning assembly (20b) includes a roof side panel positioning assembly (40) and a fan base support assembly (50). The roof side panel positioning assembly (40) has a side positioning surface (200) for contacting the outer surfaces of both sides of the roof. The top of the fan base support assembly (50) forms a positioning plane (300) for contacting the surface of the roof fan base; In the working state, multiple first roof positioning components (20a) and second roof positioning components (20b) are integrated on the base frame (10) and synchronously support the roof in the opposite direction along the length of the roof, so that the operator can stand on the ground and look down at the inner surface of the roof from inside the roof in the reversed state. The first roof positioning component (20a) includes the first positioning plate (21), the first positioning seat (22), and the second positioning seat (23); The top of the first positioning plate (21) is provided with positioning blocks (24) spaced apart on the side of the positioning surface (100), and the positioning blocks (24) contact the outer surface of the vehicle roof; The first positioning plate (21) is fixedly connected to a second positioning seat (23) below the positioning block (24). The second positioning seat (23) is threadedly connected to an adjusting rod (25), which contacts the positioning block (24) through the adjusting rod (25). The first positioning plate (21) is equipped with sliders (26) at both ends, and the sliders (26) contact the side of the roof. The first positioning plate (21) has a T-shaped first positioning seat (22) installed at its bottom. The roof side panel positioning assembly (40) includes a second positioning plate (41), a third positioning seat (42), and a fourth positioning seat (43). The second positioning plate (41) has a concave arc structure on one side of the top of the side positioning surface (200). The second positioning plate (41) is equipped with a side positioning block (44) on one side of the side positioning surface (200), and the side positioning block (44) contacts the outer surfaces of both sides of the roof. The second positioning plate (41) is fixedly connected to the fourth positioning seat (43) below the side positioning block (44). The fourth positioning seat (43) is threadedly connected to the side adjustment rod (45), and the side positioning block (44) is in contact with the side adjustment rod (45). The bottom of the second positioning plate (41) is equipped with a side slider (46), which contacts the side of the roof through the side slider (46); The third positioning seat (42) with a T-shaped structure is installed at the bottom of the second positioning plate (41).

2. The top-view welding fixture for a large vehicle roof component according to claim 1, characterized in that... ； The base frame (10) includes two parallel transition devices (12), and several basic frames (11) are fixedly connected between the two transition devices (12) to provide an installation platform.

3. The top-view welding fixture for a large vehicle roof component according to claim 2, characterized in that... ； The transition device (12) includes a plurality of transition beams (121) and end plates (124) fixed to both ends of the transition beams (121). The transition beam (121) has a groove (123) inside, an embedded nut (125) is installed in the groove (123), and an elongated hole (122) is opened on the upper surface of the transition beam (121) corresponding to the position of the groove (123). The two adjacent transition beams (121) are fixedly connected by the end plate (124) to extend the length of the transition device (12).

4. A top-view welding fixture for assembling large components on a vehicle roof, as described in claim 2. Its characteristics are: The basic frame (11) includes a beam body, a foundation positioning plate (113) welded to the top of the beam body, and a foundation base plate (115) welded to the bottom wall. The width of the foundation base plate (115) is greater than the width of the beam body, and mounting holes are provided at both ends of the foundation base plate (115).

5. The top-view welding fixture for a large vehicle roof component according to claim 1, characterized in that... ； It also includes a support structure with an I-shaped structure (30); The bracket assembly (30) includes a bracket base plate (31) and a bracket top plate (33), as well as two bracket uprights (32) connected between the bracket base plate (31) and the bracket top plate (33). The bracket base plate (31) and the bracket top plate (33) are provided with elongated holes on both sides to provide installation interfaces.

6. The top-view welding fixture for a large vehicle roof component according to claim 1, characterized in that; The fan base support assembly (50) includes a base (54) and a screw (51) fixedly connected to the base (54). The screw (51) is threadedly connected to a screw sleeve (52), and a positioning nut (53) is also fitted on the screw (51) to lock the position of the screw sleeve (52). The top of the screw sleeve (52) forms the positioning plane (300), which contacts the surface of the roof fan base.

7. The top-view welding fixture for a large vehicle roof component according to claim 1, characterized in that... ； It also includes a cable assembly (60), which is provided at both ends of the base frame (10) to locate the position of the roof edge line and the center line.

8. The top-view welding fixture for a large vehicle roof component according to claim 7, characterized in that... ； The pull wire assembly (60) includes a pull wire base plate (61) and a pull wire post (62) fixed on the pull wire base plate (61), and a pull wire guide post (63) is fitted on the pull wire post (62). The top of the pull wire guide post (63) is fixedly connected to a connecting plate (64), and a V-shaped center seat (65) is fixedly connected to one side of the connecting plate (64), and a pull wire bolt (67) is horizontally threadedly connected to the other side through the pull wire support (66).

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