Urban railway vehicle reverse installation roof welding combination tool

Abstract

The utility model discloses a welding and combining tool for a reversely-installed roof of an urban railway vehicle, and belongs to the technical field of rail transit vehicle body welding auxiliary equipment. An assembling and welding area used for assembling and welding workpieces is formed in the frame. Cross beams are arranged in the installing and welding area at intervals, the two ends of each cross beam are detachably connected with the frame, and first pressing mechanisms are arranged on the portions, located on the two sides of the installing and welding area, of the cross beams. The second pressing mechanism is arranged on the upper portion of the frame, and the second pressing mechanism is provided with a pressing plate capable of pressing the workpiece from the position above the workpiece in the width direction of the frame; the cross beam is arranged on the base, the follow-up positioning plate assembly is arranged on the side portion of the cross beam, the follow-up positioning plate assembly comprises a plurality of positioning plate split bodies and is used for supporting the workpiece in a follow-up mode in the width direction of the workpiece in the height-adjustable mode, and the workpiece supporting device has the advantages of being good in universality, short in manufacturing period, low in cost and convenient to use.

Description

Technical Field

[0001] The utility model relates to the technical field of rail transit vehicle body welding auxiliary equipment, in particular to a reverse-mounted roof welding composite tooling for a city rail vehicle. Background Art

[0002] In the past rail passenger car manufacturing process, the roof was assembled on a special tooling when it entered the assembly process. The cross-sectional diagram of the roof in reverse assembly state is shown in the attached figure. Fig.13 As shown, each project needs to reproduce a special positioning plate due to the different roof shapes (length, width). The positioning plate is usually a large positioning plate of more than 2900mm, which is large in size and has problems such as long manufacturing cycle, high production cost, and long tooling adjustment time. Utility Model Content

[0003] The utility model aims to overcome the defects of the prior art and provide a synthetic tooling for welding the reverse-mounted roof of a city railway vehicle which has good versatility, short production cycle, low cost and convenient use.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] The utility model discloses a composite tool for welding the reverse-mounted roof of a railway vehicle, comprising:

[0006] A frame, wherein a welding area for welding workpieces is formed inside the frame, cross beams are arranged at intervals in the welding area, both ends of the cross beams are detachably connected to the frame, and the cross beams are provided with first clamping mechanisms at both sides of the welding area; and further comprising

[0007] A second pressing mechanism is disposed on an upper portion of the frame, wherein the second pressing mechanism is provided with a pressing plate capable of pressing the workpiece from above the workpiece along a width direction of the frame; and

[0008] A conformable positioning plate assembly is arranged on the side of the beam, and the conformable positioning plate assembly includes a plurality of separate positioning plates, which are used to conformably support the workpiece along the width direction of the workpiece and with adjustable height.

[0009] Furthermore, the conformable positioning plate assembly includes a plate fixedly connected to the side of the beam, a base arranged below the positioning plate split, and an adjustment rod screwed with the base and in contact with the positioning plate split;

[0010] The positioning plate split body is provided with an adjustment hole, and the sticking plate passes through the adjustment hole and the positioning plate split body through a connecting piece, so that the adjustment rod drives the positioning plate split body to move along the adjustment hole.

[0011] Furthermore, the positioning plate split includes a first positioning plate split in contact with the lower surface of the workpiece and a second positioning plate split arranged on both sides of the first positioning plate split, and the top of the first positioning plate split and the second positioning plate split are located at an angular position on the workpiece side to form a conformal surface.

[0012] Furthermore, it also includes a quick positioning member that can be lifted and lowered vertically, and the quick positioning member is installed on the conformal positioning plate assembly where the cross beam is located below the second clamping mechanism.

[0013] Furthermore, the second clamping mechanism includes a bracket and a fixing seat fixedly connected to the frame;

[0014] The pressing plates are detachably connected to both sides of the bracket, and legs extending downward are fixedly connected to both ends of the bracket;

[0015] A positioning pin penetrating through the support leg is fixedly connected to the fixing seat, one end of the fixing seat is rotatably connected to a flipping and clamping mechanism via an axis, and the support leg is provided with a connecting hole in a U-shaped structure that cooperates with the flipping and clamping mechanism.

[0016] Furthermore, the first clamping mechanism includes a column, the bottom end of the column is fixedly connected to the crossbeam, the top end of the column is fixedly connected to a cantilever, and one end of the cantilever is threadedly connected to a pressing arm.

[0017] Furthermore, the frame also includes a support and a support seat fixedly connected to the top of the support, and a positioning shaft is installed on the top of the support seat, which is connected to the connecting seats fixedly connected to the two sides of the frame through the positioning shaft.

[0018] Furthermore, the inner walls of the side beams on both sides of the frame are provided with slide grooves, the slide grooves extend along the length direction of the side beams, and the slide grooves are equipped with connectors for connecting with the cross beams.

[0019] Furthermore, wire pulling devices are fixedly connected to the center positions of both ends of the frame, and the center position of the workpiece is aligned by the wire pulling devices.

[0020] Furthermore, the frame is provided with end positioning components and end pressing components at both ends of the workpiece;

[0021] The end positioning component and the end clamping component both include a base plate fixedly connected to the crossbeam, a limiting column fixedly connected to the base plate for abutting against the end of the workpiece, wherein a shaft sleeve is fixedly connected to the top end of the limiting column of the end clamping component.

[0022] In the above technical scheme, the utility model provides a composite tooling for welding the reverse roof of a city railway vehicle, which has the following beneficial effects:

[0023] 1) The tooling has a movable end positioning component at one end and an end clamping component at the other end, which can adjust the position according to the length of the roof component and can meet the needs of roof components of different lengths;

[0024] 2) The free-standing positioning plate assembly is fixed by the split positioning plate. The split positioning plate is small in size and easy to install, with a short production cycle, fast installation speed and short debugging cycle;

[0025] 3) The positions and sizes of the roof openings (air conditioning holes, etc.) of different projects are different. The tooling crossbeam 15 and the free-standing positioning plate assembly can be assembled according to the specific situation, which greatly saves the design and manufacturing time;

[0026] 4) The second clamping mechanism is used to flip and clamp the parts with large welding deformation to fix them, which can minimize the welding deformation and ensure the product quality and appearance.

[0027] The welding composite tooling combines the theories of TRIZ and lean production to optimize and improve the device, and improves the roof tooling in a simple, efficient and lean way. Compared with the existing technology, it greatly saves time, manpower and cost, improves work efficiency, and complies with the concepts of lean production, innovation and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0029] Figure 1 It is an axonometric diagram of the use state of the reverse-mounted roof welding composite tooling for urban railway vehicles disclosed in the utility model;

[0030] Figure 2 It is an axonometric view of the urban railway vehicle reverse-mounted roof welding composite tooling disclosed in the utility model;

[0031] Figure 3 This is an enlarged view of the position of the composite tooling A for reverse-mounted roof welding of a city railway vehicle disclosed in the utility model;

[0032] Figure 4 This is an enlarged view of the position of the composite tooling B for reverse-mounted roof welding of a city railway vehicle disclosed in the utility model;

[0033] Figure 5 This is a front view of the integrated tooling for welding the reverse-mounted roof of a city railway vehicle disclosed in the utility model;

[0034] Figure 6 It is a left view of the integrated tooling for welding the reverse-mounted roof of a railway car disclosed in the utility model;

[0035] Figure 7 It is a front view of a type-adapted positioning plate assembly of a reverse-mounted roof welding composite tooling for a city railway vehicle disclosed in the utility model;

[0036] Figure 8 It is a structural schematic diagram of the first clamping mechanism of the urban railway vehicle reverse roof welding composite tooling disclosed in the utility model;

[0037] Fig. 9 It is a structural schematic diagram of the second clamping mechanism of the urban railway vehicle reverse roof welding composite tooling disclosed in the utility model;

[0038] Fig.10 This is a front view of the positioning component of the reverse-mounted roof welding composite tooling of the urban railway vehicle disclosed in the utility model;

[0039] Fig.11 It is a front view of the compression assembly of the reverse-mounted roof welding composite tooling of the urban railway vehicle disclosed in the utility model;

[0040] Fig.12 It is a structural schematic diagram of another embodiment of the inverted roof welding composite tooling crossbeam of a city railway vehicle disclosed in the utility model;

[0041] Fig.13 It is a cross-sectional schematic diagram of a workpiece in an inverted state in the prior art.

[0042] Description of reference numerals:

[0043] Frame 10; support 11; support seat 12; positioning shaft 13; connecting seat 14; crossbeam 15; slide 16;

[0044] First pressing mechanism 20; column 21; cantilever 22; pressing arm 23;

[0045] Second clamping mechanism 30; bracket 31; pressing plate 32; leg 33; connecting hole 331; fixing seat 34; positioning pin 35; shaft 36; flip clamping mechanism 37; connecting rod 371; pressing handle 372;

[0046] The following positioning plate assembly 40; the positioning plate split 41; the first positioning plate split 411; the second positioning plate split 412; the mounting plate 42; the base 43; the adjustment rod 44; the adjustment hole 45; the connecting piece 46;

[0047] Quick positioning member 50;

[0048] Wire pulling device 60;

[0049] End positioning component 70; limit column 71;

[0050] End clamping assembly 80; limiting column 81; shaft sleeve 82;

[0051] Workpiece 90. DETAILED DESCRIPTION

[0052] In order 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 in conjunction with the accompanying drawings.

[0053] See also Figure 1 , 2 As shown;

[0054] The utility model of the urban railway vehicle reverse roof welding composite tooling comprises:

[0055] The frame 10 has a welding area for welding the workpiece 90 formed therein, a plurality of beams 15 are arranged at intervals in the welding area, the two ends of the beams 15 are detachably connected to the frame 10, and the beams 15 are provided with first clamping mechanisms 20 at both sides of the welding area; and further includes

[0056] A second pressing mechanism 30 is disposed on the upper portion of the frame 10 , and the second pressing mechanism 30 is provided with a pressing plate 32 capable of pressing the workpiece 90 from above the workpiece 90 along the width direction of the frame 10 ; and

[0057] The conformable positioning plate assembly 40 is mounted on the crossbeam 15 and includes a plurality of positioning plate segments 41 for conformably supporting the workpiece 90 along the width direction of the workpiece 90 and with adjustable height.

[0058] For details, see Figure 2 As shown, in this structure, the frame 10 is a rectangular parallelepiped structure formed by two longitudinal beams and two side beams, and its projection area on the water surface is larger than the projection area of ​​the workpiece 90. The workpiece 90 is a roof in the prior art. A welding area is formed in the middle of the frame 10 for the workpiece 90 to be assembled and welded in the area.

[0059] A plurality of cross beams 15 are distributed at intervals in the assembly welding area of ​​the frame 10. Both ends of the cross beams 15 are detachably connected to the longitudinal beams of the frame 10 by bolts. The cross beams 15 are provided with first clamping mechanisms 20 at both sides of the assembly welding area. The first clamping mechanisms 20 clamp the workpiece 90 from the side of the workpiece 90.

[0060] Two second clamping mechanisms 30 are arranged near the end of the frame 10. The second clamping mechanisms 30 use a pressing plate 32 to clamp the workpiece 90 from above along the width direction of the workpiece 90 to position the workpiece 90 on the frame 10.

[0061] The conformable positioning plate assembly 40 is used to provide a positioning reference and is assembled on the crossbeam 15. Figure 7As shown, the conformable positioning plate assembly 40 includes a plurality of positioning plate segments 41, specifically 14 positioning plate segments 41, the positioning plate segments 41 are symmetrically distributed on the beam 15, and a conformable surface in contact with the workpiece 90 is formed at the top of the positioning plate segments 41. The positioning plate segments 41 include two types with width dimensions of 60 mm and 210 mm. Of course, the width can be widened or narrowed according to actual support requirements. The plurality of positioning plate segments 41 are distributed along the length direction of the beam 15 at intervals, and the height of the positioning plate segments 41 can be adjusted up and down, so that the plurality of positioning plate segments 41 can conformally support and position the workpiece 90 from below the workpiece 90 along the width direction of the workpiece 90 to ensure the size of the workpiece 90 after welding.

[0062] See also Figure 2 , 7 As shown:

[0063] Preferably, the conformable positioning plate assembly 40 includes a plate 42 fixedly connected to the side of the beam 15, a base 43 disposed below the positioning plate split 41, and an adjustment rod 44 screw-driven with the base 43 and in contact with the positioning plate split 41;

[0064] The positioning plate body 41 is provided with an adjustment hole 45 , and the attachment plate 42 penetrates the adjustment hole 45 and the positioning plate body 41 through a connecting piece 46 , so that the adjustment rod 44 drives the positioning plate body 41 to move along the adjustment hole 45 .

[0065] For details, see Figure 7 As shown, the free-standing positioning plate assembly 40 includes a mounting plate 42, a positioning plate split body 41, a base 43, an adjustment rod 44, and a connecting piece 46;

[0066] The plate 42 is a rectangular plate, one side of which is fixedly connected to the crossbeam 15, and the lower edge and both sides of the other side are fixedly connected to the base 43 by bolts. The base 43 is threadedly connected with an adjusting rod 44, which is a bolt in the prior art, and can certainly be a rod with external threads. The plate 42 is located above the base 43 and is connected to the positioning plate split 41 through a connecting piece 46. The positioning plate split 41 is provided with a long strip-shaped adjusting hole 45. In order to prevent the positioning plate split 41 from rotating, the adjusting hole 45 includes two. The bottom end of the positioning plate split 41 contacts the adjusting rod 44. When in use, the rotating adjusting rod 44 drives the positioning plate split 41 to rise and fall, thereby adapting to the lower surface of the workpiece 90 to achieve positioning and support the workpiece 90.

[0067] See also Figure 7 As shown:

[0068] Preferably, the positioning plate split 41 includes a first positioning plate split 411 in contact with the lower surface of the workpiece 90 and a second positioning plate split 412 arranged on both sides of the first positioning plate split 411, the first positioning plate split 411 and the second positioning plate split 412 are formed with a conforming surface at an angular position located on the side of the workpiece 90, and the specific second positioning plate split 412 is formed with a conforming surface at an angular position located on the side of the workpiece 90, and contacts the side top surface of the roof through the conforming positioning surface, and the top of the first positioning plate split 411 is formed with a conforming surface, and contacts the top surface of the roof through the conforming surface, the width of the first positioning plate split 411 is 60mm, the width of the second positioning plate split 412 is 210mm, and the height of the second positioning plate split 412 is greater than the first positioning plate split 411, and a side base 43 is provided on the side of the pasting plate 42, and the position of the second positioning plate split 412 can be adjusted in the horizontal direction by installing an adjustment rod 44 on the side base 43, thereby adjusting the center position of the workpiece 90;

[0069] In order to ensure the best support strength of the roof components and the shape of the roof components after welding, in this embodiment, one positioning plate split 41 is arranged every 100-280 mm in the horizontal direction, and a total of 12 60 mm positioning plate splits and 2 210 mm positioning plate splits are arranged. The two ends of the roof are positioned by the end positioning component 70 and the end pressing component 80. In the longitudinal direction, 25 cross beams 15 are arranged every 220-643.5 mm according to the position of the roof cross beam;

[0070] See also Fig.12 As shown:

[0071] Preferably, the tooling also includes a quick positioning member 50 that can be lifted and lowered vertically, and the quick positioning member 50 is installed on the conformal positioning plate assembly 40 of the cross beam 15 located below the second clamping mechanism 30. The quick positioning member 50 is a push-pull type quick clamp in the prior art, and the fast positioning member 50 is installed on the plate 42 of the cross beam 15 located below the second clamping mechanism 30. The two quick positioning members 50 replace the two first positioning plate splits 411, which facilitates quick positioning;

[0072] See also Figure 2 , 4 , as shown in 9:

[0073] Preferably, the second pressing mechanism 30 includes a bracket 31 and a fixing seat 34 fixedly connected to the frame 10;

[0074] The two sides of the bracket 31 are detachably connected with a pressing plate 32, and the two ends of the bracket 31 are fixedly connected with a downwardly extending support leg 33;

[0075] A positioning pin 35 penetrating the support leg 33 is fixedly connected to the fixing seat 34 . One end of the fixing seat 34 is rotatably connected to a flipping and clamping mechanism 37 via a shaft 36 . The support leg 33 is provided with a connecting hole 331 in a U-shaped structure that cooperates with the flipping and clamping mechanism 37 .

[0076] Specifically, in this structure, see Fig. 9 As shown, the bracket 31 is a frame structure, and the two sides of the bracket 31 are detachably connected with the pressing plates 32 by bolt assemblies, and the upper surface of the workpiece 90 is pressed by the pressing plates 32. A lifting ring is installed on the upper part of the bracket 31, and it is connected to the lifting equipment through the lifting ring. The two sides of the two ends of the bracket 31 are respectively formed with downwardly extending legs 33, and the ends of the legs 33 are fixedly connected with connecting plates, and the connecting plates are provided with shaft holes and U-shaped connecting holes 331. The fixing seat 34 is fixedly connected to the frame 10, and the upper surface of the fixing seat 34 is fixedly connected with a positioning pin 35. One end of the fixing seat 34 is connected with a flip pressing mechanism 37 through a shaft 36. The flip pressing mechanism 37 includes a connecting rod 371 rotatably connected to the shaft 36 and a pressing handle 372 threadedly connected to the connecting rod 371.

[0077] When in use, the bracket 31 is placed above the frame 10, the positioning pin 35 is located in the hole of the shaft 36, the connecting rod 371 is turned around the shaft 36 and placed in the connecting hole 331, and the pressing handle 372 is rotated to press the connecting plate;

[0078] See also Figure 8 As shown:

[0079] Preferably, the first clamping mechanism 20 includes a column 21, the bottom end of the column 21 is fixedly connected to the cross beam 15, the top end of the column 21 is fixedly connected to a cantilever 22, one end of the cantilever 22 is threadedly connected to a pressing arm 23, when in use, the pressing arm 23 is rotated, and the pressing arm 23 moves downward to clamp the side beam of the workpiece 90;

[0080] See also Figure 2 , 3 As shown:

[0081] Preferably, the frame 10 further includes a support 11 and a support base 12 fixedly connected to the top of the support 11;

[0082] The bottom end of the support 11 contacts the ground and is fixedly connected to the ground infrastructure by bolts;

[0083] A positioning shaft 13 is installed at the top of the support seat 12, which is connected to the connecting seat 14 fixedly connected to both sides of the frame 10 through the positioning shaft 13. Specifically, a U-shaped groove is opened on the two support plates at the top of the support seat 12, and the positioning shaft 13 is placed in the U-shaped groove. An arc surface matching the positioning shaft 13 is opened at the lower part of the connecting seat 14. The connecting seat 14 is overlapped on the positioning shaft 13 through the arc surface, which is convenient for quick assembly.

[0084] See also Figure 2 As shown:

[0085] Preferably, a slide groove 16 is provided on the inner wall of the side beams on both sides of the frame 10, and the slide groove 16 extends along the length direction of the side beams. The slide groove 16 is installed with a connecting piece 46 for connecting with the cross beam 15. Specifically, the slide groove 16 is a T-shaped slide groove, and the connecting piece 46 is a T-shaped bolt. During assembly, the T-shaped bolt passes through the connecting plates at both ends of the cross beam 15 and the nuts are used to make the cross beam 15 and the side beams of the frame 10 removably fixedly connected, and the position of the cross beam 15 can be quickly adjusted through the slide groove 16.

[0086] See also Figure 2 , 10 、11 as shown:

[0087] Preferably, a wire pulling device 60 is fixedly connected to the center position of both ends of the frame 10, and the center position of the workpiece 90 is aligned by the wire pulling device 60. The frame 10 is respectively installed with an end positioning assembly 70 and an end clamping assembly 80 at both ends of the workpiece 90. The end positioning assembly 70 and the end clamping assembly 80 both include a base plate fixedly connected to the cross beam 15, and a limiting column for abutting against the end of the workpiece 90 is fixedly connected to the base plate, wherein a shaft sleeve 82 is fixedly connected to the top of the limiting column of the end clamping assembly 80.

[0088] When in use, the crossbeam 15 fixedly connected with the end positioning assembly 70 is fixedly connected to the frame 10 by T-bolts, so that the position of the end positioning assembly 70 is fixed, and the crossbeam 15 fixedly connected with the end clamping assembly 80 is pre-assembled on the frame 10 by T-bolts, and the distance between the limiting column 81 of the end clamping assembly 80 and the limiting column 71 of the end positioning assembly 70 is greater than the length of the workpiece 90. When positioning the workpiece 90, the profile of the workpiece 90 is placed between the limiting column 81 and the limiting column 71. After all the profiles of the workpiece 90 are assembled in place, the position of the crossbeam 15 of the end clamping assembly 80 is adjusted, so that the limiting column 81 of the end clamping assembly 80 and the limiting column 71 of the end positioning assembly 70 are abutted against the end of the workpiece 90, and the position of the crossbeam 15 of the end clamping assembly 80 is locked, so that the end positioning of the workpiece 90 is completed;

[0089] In the above technical scheme, the utility model provides a synthetic tooling for welding the reverse-mounted roof of an urban railway vehicle, and the method of use is as follows: when in use, the roof profile is spliced ​​on the positioning plate split 41 of the conformable positioning plate assembly 40, and after the size is adjusted according to the design requirements, the workpiece and the conformable positioning plate assembly 40 are pressed together by the end positioning assembly 70, the end clamping assembly 80, the second clamping mechanism 30, and the first clamping mechanism 20, and then welding is performed.

[0090] Beneficial effects:

[0091] 1) The tooling has a movable end positioning component 70 at one end and an end pressing component 80 at the other end, which can be adjusted according to the length of the roof component and can meet the needs of roof components of different lengths;

[0092] 2) The form-fitting positioning plate assembly 40 is fixed by the positioning plate split 41. The positioning plate split 41 is small in size and easy to install, with a short production cycle, fast installation speed and short debugging cycle;

[0093] 3) The positions and sizes of the roof openings (air conditioning holes, etc.) of different projects are different. The tooling crossbeam 15 and the free-standing positioning plate assembly 40 can be assembled according to the specific situation, which greatly saves the design and manufacturing time;

[0094] 4) The second clamping mechanism 30 is used to flip and clamp the parts with large welding deformation to fix them, so as to minimize the welding deformation and ensure the product quality and appearance.

[0095] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that 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 above 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. Urban railway car reverse installation roof welding synthetic tooling, It is characterized in that include: A frame (10) is formed with a welding area for welding workpieces (90) therein, cross beams (15) are arranged at intervals in the welding area, both ends of the cross beams (15) are detachably connected to the frame (10), and the cross beams (15) are provided with first clamping mechanisms (20) on both sides of the welding area; and further comprising a second pressing mechanism (30) disposed on an upper portion of the frame (10), the second pressing mechanism (30) being provided with a pressing plate (32) capable of pressing the workpiece (90) from above the workpiece (90) along a width direction of the frame (10); and A conformable positioning plate assembly (40) is arranged on the side of the crossbeam (15), and the conformable positioning plate assembly (40) includes a plurality of positioning plate segments (41) for conformably supporting the workpiece (90) along the width direction of the workpiece (90) and with adjustable height.

2. The urban railway vehicle reverse roof welding synthetic tooling according to claim 1, Features ； The conformable positioning plate assembly (40) comprises a plate (42) fixedly connected to the side of the crossbeam (15), a base (43) arranged below the positioning plate split body (41), and an adjustment rod (44) screw-driven with the base (43) and in contact with the positioning plate split body (41); The positioning plate split body (41) is provided with an adjustment hole (45), and the sticking plate (42) passes through the adjustment hole (45) and the positioning plate split body (41) through a connecting piece (46), so that the adjustment rod (44) drives the positioning plate split body (41) to move along the adjustment hole (45).

3. The urban railway vehicle reverse roof welding synthetic tooling according to claim 2, Features ； The positioning plate split (41) includes a first positioning plate split (411) in contact with the lower surface of the workpiece (90) and a second positioning plate split (412) arranged on both sides of the first positioning plate split (411), and the top of the first positioning plate split (411) and the second positioning plate split (412) are formed with a conformal surface at an angular position located on the side of the workpiece (90).

4. The urban railway vehicle reverse roof welding synthetic tooling according to claim 1, Features ； It also includes a quick positioning member (50) capable of vertical lifting and lowering, and the quick positioning member (50) is installed on the conformal positioning plate assembly (40) located below the second clamping mechanism (30) and the crossbeam (15).

5. The urban railway vehicle reverse roof welding composite tooling according to claim 1, It is characterized by: The second pressing mechanism (30) comprises a bracket (31) and a fixing seat (34) fixedly connected to the frame (10); The pressing plates (32) are detachably connected to both sides of the bracket (31), and the two ends of the bracket (31) are fixedly connected to supporting legs (33) extending downwards; A positioning pin (35) penetrating the support leg (33) is fixedly connected to the fixing seat (34); one end of the fixing seat (34) is rotatably connected to a flipping and clamping mechanism (37) via a shaft (36); and the support leg (33) is provided with a connecting hole (331) in a U-shaped structure that cooperates with the flipping and clamping mechanism (37).

6. The urban railway vehicle reverse roof welding composite tooling according to claim 1, It is characterized by: The first clamping mechanism (20) comprises a column (21), the bottom end of the column (21) is fixedly connected to the crossbeam (15), the top end of the column (21) is fixedly connected to a cantilever (22), and one end of the cantilever (22) is threadedly connected to a pressing arm (23).

7. The urban railway vehicle reverse roof welding composite tooling according to claim 1 ， It is characterized by: The frame (10) further comprises a support (11) and a support seat (12) fixedly connected to the top of the support seat (11); a positioning shaft (13) is installed at the top of the support seat (12) and is connected to connection seats (14) fixedly connected to both sides of the frame (10) via the positioning shaft (13).

8. The urban railway vehicle reverse roof welding composite tooling according to claim 7 ， It is characterized by: The inner walls of the side beams on both sides of the frame (10) are provided with sliding grooves (16), the sliding grooves (16) extending along the length direction of the side beams, and the sliding grooves (16) are equipped with connecting pieces (46) for connecting with the cross beams (15).

9. The synthetic tooling for welding the reverse roof of a railway vehicle according to any one of claims 1 to 8 ， It is characterized by: A wire pulling device (60) is fixedly connected to the center positions of both ends of the frame (10), and the center position of the workpiece (90) is aligned by the wire pulling device (60).

10. The synthetic tooling for welding the reverse roof of a railway vehicle according to any one of claims 1 to 8 ， It is characterized by: The frame (10) is located at both ends of the workpiece (90) and is respectively equipped with an end positioning component (70) and an end pressing component (80); The end positioning component (70) and the end clamping component (80) both comprise a base plate fixedly connected to the crossbeam (15), a limiting column fixedly connected to the base plate for abutting against the end of the workpiece (90), wherein a shaft sleeve (82) is fixedly connected to the top end of the limiting column of the end clamping component (80).

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