Automobile elbow welding clamp

Abstract

The utility model discloses an automobile elbow welding clamp which comprises a welding workbench, a first pipe fitting clamping seat, a clamping frame, a rotating table and a second pipe fitting clamping seat. The first pipe fitting clamping base and the rotating table are fixed to the upper end face of the welding workbench. The first pipe fitting clamping base and the second pipe fitting clamping base are the same in structure. The first pipe fitting clamping seat and the second pipe fitting clamping seat are each internally provided with a lead screw kinematic pair, and the lead screw kinematic pairs are divided into an X-axis lead screw kinematic pair and a Y-axis lead screw kinematic pair. The X-axis lead screw kinematic pair and the Y-axis lead screw kinematic pair are the same in structure. A clamping frame is arranged in each X-axis lead screw kinematic pair and each Y-axis lead screw kinematic pair; the two clamping frames on the first pipe fitting clamping seat are used for clamping a first welding bent pipe, and the two clamping frames on the second pipe fitting clamping seat are used for clamping a second welding bent pipe; the second pipe fitting clamping seat rotates through the rotating table, and the first welding bent pipe and the second welding bent pipe are kept to be in welded junction butt joint on the same horizontal plane; and welding of a U-shaped pipe or an S-shaped pipe is achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to welding auxiliary equipment technical field, concretely relates to a kind of automobile pipe bending welding fixture. BACKGROUND

[0002] In the manufacturing process of automobile vehicle, there are many parts needing pipe bending welding, in the manufacturing process of automobile, there are many parts needing pipe bending welding, such as exhaust pipe, silencer and other components in engine exhaust system need to be pipe bending welded.Different bending radius is used on different vehicles, when pipe bending welding is carried out, the fixture for pipe bending welding is used to fix and position the parts needing welding.The fixture for pipe bending welding is various, the radius of existing U-shaped pipe welding fixture is mostly fixed size, cannot be adjusted according to the bending radius of different pipe fittings, different pipe bending fixtures need to be replaced when welding pipe of different radius and type, which increases the cost of manufacturing pipe welding. SUMMARY

[0003] The present application aims at solving the above problems, and provides an automobile pipe bending welding fixture.

[0004] An automobile pipe bending welding fixture, comprising: a welding workbench, a first pipe fitting clamping seat, a clamping frame, a rotating table, a second pipe fitting clamping seat; the welding workbench comprises: a workbench surface, a welding table foot support, a ground level iron, the two side edges of the workbench surface are fixed on the ground level iron through the welding table foot support; the first pipe fitting clamping seat and the rotating table are fixed on the two sides of the workbench surface; the first pipe fitting clamping seat and the second pipe fitting clamping seat are the same in structure; the first pipe fitting clamping seat and the second pipe fitting clamping seat are both provided with screw motion pairs, the screw motion pairs are divided into X-axis screw motion pairs and Y-axis screw motion pairs; the X-axis screw motion pairs and the Y-axis screw motion pairs are the same in structure; the X-axis screw motion pairs and the Y-axis screw motion pairs are at an angle of 90 degrees; each X-axis screw motion pair and Y-axis screw motion pair is provided with a clamping frame; the two clamping frames on the first pipe fitting clamping seat clamp a first welding elbow pipe, and the two clamping frames on the second pipe fitting clamping seat clamp a second welding elbow pipe; the second pipe fitting clamping seat rotates through the rotating table, so that the first welding elbow pipe and the second welding elbow pipe are butt-jointed at the same horizontal plane; the welding of U-shaped pipe or S-shaped pipe is realized.

[0005] The clamping frame comprises a clamp connecting seat, a clamp seat vertical rod, a pipe chuck, a chuck cover, a chuck worm, a chuck worm wheel, a centripetal spiral disc and a clamping block clamp jaw; the clamp connecting seat is arranged on a kinematic pair; the pipe chuck is fixed on the clamp connecting seat through the clamp seat vertical rod; the centripetal spiral disc is fixed on the chuck worm wheel; the chuck worm wheel is connected between the pipe chuck and the chuck cover; the chuck cover is fixed on the pipe chuck; the chuck worm is engaged with the chuck worm wheel; the edge of the pipe chuck is provided with a U-shaped sliding block groove; the chuck cover is provided with a convex sliding block groove, and the U-shaped sliding block groove and the convex sliding block groove are correspondingly arranged to form a sliding block sleeve; the sliding block sleeve is provided with a plurality of sliding block sleeves, and each sliding block sleeve is provided with a clamping block; the axes of the plurality of clamping blocks intersect at a point to form a pipe clamping opening; the inner side end of each clamping block is connected with two clamp jaws; the clamp jaws clamp the wall of the welded elbow pipe.

[0006] The screw motion pair comprises two guide rails, a sliding block, a screw rod, a nut and a screw driving motor; the two guide rails are parallel to each other and arranged between the two guide rails; the sliding block is sleeved on each guide rail; the nut is sleeved on the screw rod; the sliding block and the nut are fixed on the lower end surface of the clamp connecting seat.

[0007] The screw motion pairs arranged in the first pipe clamping seat are a first X-axis screw motion pair and a first Y-axis screw motion pair; the screw motion pairs arranged in the second pipe clamping seat are a second X-axis screw motion pair and a second Y-axis screw motion pair.

[0008] The clamping frame comprises a first X-axis clamping frame, a first Y-axis clamping frame, a second X-axis clamping frame and a second Y-axis clamping frame; the first control panel is further arranged in the first pipe clamping seat; the first X-axis clamping frame is arranged on the first X-axis screw motion pair; the first Y-axis clamping frame is arranged on the first Y-axis screw motion pair; the first control panel drives and controls the first X-axis screw motion pair to drive the first X-axis clamping frame to move along the X-axis on the first pipe clamping seat; the first control panel drives and controls the first Y-axis screw motion pair to drive the first Y-axis clamping frame to move along the Y-axis on the first pipe clamping seat.

[0009] The first X-axis pipe clamping opening is arranged on the first X-axis clamping frame; the first Y-axis pipe clamping opening is arranged on the first Y-axis clamping frame; the first X-axis pipe clamping opening and the first Y-axis pipe clamping opening clamp the two ends of the first welded elbow pipe; the second X-axis pipe clamping opening is arranged on the second X-axis clamping frame; the second Y-axis pipe clamping opening is arranged on the second Y-axis clamping frame; the second X-axis pipe clamping opening and the second Y-axis pipe clamping opening clamp the two ends of the second welded elbow pipe; the four pipe clamping openings are arranged on the same horizontal plane.

[0010] The rotating table comprises a rotating disc base, a rotating tray, a positioning lock rod, and a positioning spring; the rotating disc base is provided with a tray shaft joint ring, the rotating tray is provided with a tray connecting shaft below, the tray connecting shaft is sleeved in the tray shaft joint ring; the positioning lock rod is provided with a positioning lock tongue at one end, the positioning lock tongue is provided with a lock rod connecting shaft, the lock rod connecting shaft is connected with the tray shaft joint ring, the positioning spring is arranged beside the lock rod connecting shaft, and the tray connecting shaft is provided with a plurality of positioning clamping grooves below; the plurality of positioning clamping grooves are arranged in an annular equidistant array; the positioning spring supports the positioning lock rod so that the positioning lock tongue is embedded in the positioning clamping groove.

[0011] The technical scheme provides a kind of automobile pipe bending welding fixture, it includes: welding workbench, first pipe fitting clamping seat, clamping frame, rotating table, second pipe fitting clamping seat;The first pipe fitting clamping seat and rotating table are fixed on the upper end surface of welding workbench;First pipe fitting clamping seat and second pipe fitting clamping seat structure are same;First pipe fitting clamping seat and second pipe fitting clamping seat are all provided with screw rod kinematic pair, screw rod kinematic pair is divided into X-axis screw rod kinematic pair and Y-axis screw rod kinematic pair;X-axis screw rod kinematic pair and Y-axis screw rod kinematic pair structure are same;X-axis screw rod kinematic pair and Y-axis screw rod kinematic pair are included at 90 degrees;Each X-axis screw rod kinematic pair and Y-axis screw rod kinematic pair are provided with a clamping frame;Two clamping frames on first pipe fitting clamping seat clamp first welding elbow pipe, two clamping frames on second pipe fitting clamping seat clamp second welding elbow pipe;Second pipe fitting clamping seat is rotated by rotating table, keeps first welding elbow pipe and second welding elbow pipe in same horizontal plane welding mouth butt joint;Realize the welding of U-shaped pipe or S-shaped pipe. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is the use state schematic diagram of the automobile pipe bending welding fixture of the utility model;

[0013] Figure 2 It is the whole pipe fitting clamping structure schematic diagram of the automobile pipe bending welding fixture of the utility model;

[0014] Figure 3 It is the first pipe fitting clamping seat front shaft side schematic diagram of the automobile pipe bending welding fixture of the utility model;

[0015] Figure 4 It is the clamping frame structure schematic diagram of the automobile pipe bending welding fixture of the utility model;

[0016] Figure 5 It is the clamping block structure schematic diagram of the automobile pipe bending welding fixture of the utility model;

[0017] Figure 6 It is the second pipe fitting clamping seat and rotating table connection schematic diagram of the automobile pipe bending welding fixture of the utility model;

[0018] Figure 7is a rotating disc base local view of the utility model one kind for automobile bent pipe welding fixture,

[0019] Figure 8 is a rotating tray lower end surface local view of the utility model one kind for automobile bent pipe welding fixture,

[0020] In the drawing: 1, welding workbench, 11, workbench surface;12, welding table foot stand, 13, ground iron, 2, first pipe fitting clamping seat, 21, first X-axis guide rail, 22, first X-axis sliding block, 231, first X-axis screw, 232, first X-axis nut, 24, first X-axis screw driving motor, 25, first Y-axis guide rail, 26, first Y-axis sliding block, 271, first Y-axis screw, 272, first Y-axis nut, 28, first Y-axis screw driving motor, 29, first control panel, 3, first X-axis clamping frame, 31, first X-axis clamp connecting seat, 32, first X-axis clamp seat stand, 33, first X-axis pipe fitting chuck, 331, first worm shaft joint, 332, first X-axis U-shaped sliding block groove;34, first X-axis chuck cover, 341, first X-axis convex sliding block groove, 35, first X-axis chuck worm, 351, multi-rib screw head, 36, first X-axis chuck worm wheel, 37, first X-axis centripetal screw disc, 38, first X-axis clamping block, 381, first X-axis sliding block convex sliding part, 382, first X-axis sliding block centripetal screw groove, 39, first X-axis clamping jaw;4, first Y-axis clamping frame, 5, rotating table, 51, rotating disc base, 511, tray shaft joint ring, 512, lock rod sliding groove, 513, lock rod shaft joint, 52, rotating tray, 521, tray connecting shaft, 5211, positioning clamping groove, 53, positioning lock rod, 531, positioning lock tongue, 532, lock rod connecting shaft, 533, handle, 54, positioning spring, 6, second pipe fitting clamping seat, 61, second X-axis guide rail, 62, second X-axis sliding block, 631, second X-axis screw, 64, second X-axis screw driving motor, 65, second Y-axis guide rail, 66, second Y-axis sliding block, 671, second Y-axis screw, 68, second Y-axis screw driving motor, 69, second control panel, 7, second X-axis clamping frame, 72, second X-axis clamp seat stand, 71, second X-axis clamp connecting seat, 8, second Y-axis clamping frame, 81, second Y-axis connecting seat, 82, second Y-axis seat stand, 91, first welding bent pipe, 92, second welding bent pipe. DETAILED DESCRIPTION

[0021] The technical scheme will be further clearly and completely described below in conjunction with the drawings of the technical scheme, and the described embodiments are only a part of the technical scheme, not all embodiments, and all other embodiments obtained by those skilled in the art without creative labor based on the technical scheme belong to the protection scope of the utility model.

[0022] Embodiment

[0023] Referring to Figures 1 to 8 As shown in the figure, a car pipe welding clamp comprises a welding workbench 1, a first pipe clamp seat 2, a first X-axis clamp frame 3, a first Y-axis clamp frame 4, a rotating table 5, a second pipe clamp seat 6, a second X-axis clamp frame 7, and a second Y-axis clamp frame 8.

[0024] The welding workbench 1 comprises a workbench surface 11, two welding table foot supports 12, and a ground iron 13. The two welding table foot supports 12 are respectively fixed on the two sides of the workbench surface 11 by bolts. The two welding table foot supports 12 are fixed on the ground iron 13 by T-shaped bolts. That is, the two sides of the workbench surface 11 are fixed on the ground iron 13 by the welding table foot supports 12.

[0025] The first X-axis clamp frame 3 and the first Y-axis clamp frame 4 are the same in structure, and are arranged on the first pipe clamp seat 2. The second X-axis clamp frame 7 and the second Y-axis clamp frame 8 are the same in structure, and are arranged on the second pipe clamp seat 6. The first pipe clamp seat 2 and the rotating table 5 are respectively fixed on the two sides of the workbench surface 11 by bolts.

[0026] The first pipe clamp seat 2 is an L-shaped frame plate, and is provided with a first X-axis guide rail 21, a first X-axis sliding block 22, a first X-axis lead screw assembly, a first X-axis lead screw driving motor 24, a first Y-axis guide rail 25, a first Y-axis sliding block 26, a first Y-axis lead screw assembly, a first Y-axis lead screw driving motor 28, and a first control panel 29.

[0027] The first X-axis guide rail 21 is provided with two, and the two first X-axis guide rails 21 are fixed on one side of the first pipe clamp seat 2. Two first X-axis sliding blocks 22 are sleeved on each first X-axis guide rail 21.

[0028] The first X-axis lead screw assembly comprises a first X-axis lead screw 231 and a first X-axis lead screw nut 232. The first X-axis lead screw 231 is arranged between the two first X-axis guide rails 21, and the two ends of the first X-axis lead screw 231 are rotatably connected to one side of the first pipe clamp seat 2. The first X-axis guide rail 21 and the first X-axis lead screw 231 are parallel to each other. The first X-axis lead screw nut 232 is sleeved on the first X-axis lead screw 231. The first X-axis guide rail 21 and the first Y-axis guide rail 25 form an angle of 90 degrees. The first Y-axis guide rail 25 is provided with two, and the two first Y-axis guide rails 25 are fixed on the other side of the first pipe clamp seat 2. Two first Y-axis sliding blocks 26 are sleeved on each first X-axis guide rail 21. The first X-axis lead screw driving motor 24 is arranged on one side of the first X-axis lead screw 231.

[0029] The first X-axis screw rod assembly and the first Y-axis screw rod assembly are structurally identical; the first Y-axis screw rod assembly comprises a first Y-axis screw rod 271 and a first Y-axis screw nut 272; the first Y-axis screw rod 271 is arranged between the two first Y-axis guide rails 22, and the two ends of the first Y-axis screw rod 271 are connected to the other side of the first pipe clamp base 2; the first Y-axis guide rail 22 and the first Y-axis screw rod 271 are parallel to each other; the first Y-axis screw nut 272 is sleeved on the first Y-axis screw rod 271; the first Y-axis screw rod driving motor 28 is arranged on one side of the first Y-axis screw rod 271;

[0030] The first X-axis guide rail 21, the first X-axis sliding block 22, the first X-axis screw rod assembly, and the first X-axis screw rod driving motor 24 constitute a first X-axis screw rod kinematic pair; the first Y-axis guide rail 25, the first Y-axis sliding block 26, the first Y-axis screw rod assembly, and the first Y-axis screw rod driving motor 28 constitute a first Y-axis screw rod kinematic pair;

[0031] The first control panel 29 is arranged on the side of the first pipe clamp base 2, and the first control panel 29 can independently control the start and stop of the first X-axis screw rod driving motor 24 and the first Y-axis screw rod driving motor 28; the first X-axis screw rod driving motor 24 drives the first X-axis screw rod 231 to rotate; the first Y-axis screw rod driving motor 28 drives the first Y-axis screw rod 271 to rotate.

[0032] The first X-axis clamp frame 3 comprises a first X-axis clamp connecting base 31, a first X-axis clamp seat stand 32, a first X-axis pipe chuck 33, a first X-axis chuck cover 34, a first X-axis chuck worm 35, a first X-axis chuck worm wheel 36, a first X-axis centripetal spiral disc 37, a first X-axis clamping block 38, and a first X-axis clamping jaw 39.

[0033] The first Y-axis sliding block 26 and the first X-axis screw nut 232 are fixed to the lower end surface of the first X-axis clamp connecting base 31; the first X-axis clamp seat stand 32 is fixed to the upper end surface of the first X-axis clamp connecting base 31; the first X-axis pipe chuck 33 is fixed to the upper end of the first X-axis clamp seat stand 32; the inner side of the first X-axis pipe chuck 33 is provided with a recess, and the lower end of the recess of the first X-axis pipe chuck 33 is provided with a first worm shaft connecting portion 331; the first X-axis chuck worm 35 is connected to the first worm shaft connecting portion 331; the edge of the first X-axis pipe chuck 33 is provided with five first X-axis U-shaped sliding block grooves 332.

[0034] The center of the first X-axis pipe fitting chuck 33, the first X-axis chuck cover 34, the first X-axis chuck worm gear 36 and the first X-axis centripetal screw disc 37 is provided with a directly same pipe fitting clamping opening; the axial center lines of the five first X-axis U-shaped sliding block grooves 332 intersect on the axial center line of the pipe fitting clamping opening; the first X-axis chuck worm gear 36 is connected with the pipe fitting clamping opening of the first X-axis pipe fitting chuck 33 on one side; the first X-axis centripetal screw disc 37 is fixed on one side of the first X-axis chuck worm gear 36; the first X-axis chuck worm 35 is engaged with the first X-axis chuck worm gear 36, and the first X-axis chuck worm 35 drives the first X-axis centripetal screw disc 37 to rotate;

[0035] The first X-axis chuck cover 34 is fixed on the first X-axis pipe fitting chuck 33 by screw locking; the first X-axis chuck cover 34 is provided with five first X-axis convex sliding block grooves 341, and the five first X-axis convex sliding block grooves 341 correspond to the five first X-axis U-shaped sliding block grooves 332 respectively;

[0036] The first X-axis chuck cover 34 is fixed on the first X-axis pipe fitting chuck 33 by screw locking; the first X-axis chuck cover 34 is provided with five first X-axis convex sliding block grooves 341, and the five first X-axis convex sliding block grooves 341 correspond to the five first X-axis U-shaped sliding block grooves 332 respectively;

[0037] The end of the first X-axis chuck worm 35 is provided with a polygonal screw head 351, a wrench is sleeved on the polygonal screw head 351, and the first X-axis chuck worm 35 is manually rotated; the first X-axis chuck worm 35 drives the first X-axis centripetal screw disc 37 to rotate; the first X-axis centripetal screw disc 37 drives the five first X-axis clamping blocks 38 to synchronously slide in the first X-axis sliding block sleeve.

[0038] The first pipe fitting clamping seat 2 and the second pipe fitting clamping seat 6 are the same in structure; the first X-axis clamping frame 3 and the first Y-axis clamping frame 4 are the same in structure, the second X-axis clamping frame 7 and the second Y-axis clamping frame 8 are the same in structure, and the pipe fitting clamping openings of the first X-axis clamping frame 3, the first Y-axis clamping frame 4, the second X-axis clamping frame 7 and the second Y-axis clamping frame 8 are on the same horizontal plane.

[0039] The rotating table 5 comprises a rotating disc base 51, a rotating tray 52, a positioning lock rod 53, and a positioning spring 54; the rotating disc base 51 is provided with a tray shaft connecting ring 511, one side of the tray shaft connecting ring 511 is provided with a lock rod sliding groove 512, and one side of the lock rod sliding groove 512 is provided with a lock rod shaft connecting frame 513; one side end of the positioning lock rod 53 is provided with a positioning lock tongue 531, and a lock rod connecting shaft 532 is provided beside the positioning lock tongue 531 and is connected to the lock rod shaft connecting frame 513; the positioning spring 54 is arranged beside the lock rod connecting shaft 532, and the other end of the positioning lock rod 53 is provided with a handle 533;

[0040] The rotating tray 52 is provided below with a tray connecting shaft 521, which is a stepped shaft, the lower end of the tray connecting shaft 521 is a large shaft diameter, and the outer end surface of the large shaft diameter of the tray connecting shaft 521 is provided with a plurality of positioning clamping grooves 5211, which are annularly and equidistantly arranged; the positioning clamping grooves 5211 in the technical solution are eight in number;

[0041] The large shaft diameter of the tray connecting shaft 521 is sleeved in the tray shaft connecting ring 511; the positioning lock tongue 531 is embedded in the positioning clamping groove 5211; the positioning spring 54 is a compression spring, which pushes the positioning lock rod 53 upward; the handle 533 is pressed downward, the positioning lock tongue 531 at the end of the positioning lock rod 53 is separated upward from the positioning clamping groove 5211, and the rotating tray 52 can be rotated after being released from positioning.

[0042] The second pipe fitting clamping seat 6 is provided with a second X-axis guide rail 61, a second X-axis sliding block 62, a second X-axis screw assembly, a second X-axis screw driving motor 64, a second Y-axis guide rail 65, a second Y-axis sliding block 66, a second Y-axis screw assembly, a second Y-axis screw driving motor 68, and a second control panel 69;

[0043] The second X-axis guide rail 61, the second X-axis sliding block 62, the second X-axis screw assembly, and the second X-axis screw driving motor 64 form a second X-axis screw pair; the second Y-axis guide rail 65, the second Y-axis sliding block 66, the second Y-axis screw assembly, and the second Y-axis screw driving motor 68 form a second Y-axis screw pair;

[0044] The second X-axis clamping frame 7 is below a second X-axis clamp connecting seat 71, and the second X-axis clamp connecting seat 71 is provided with a second X-axis clamp seat vertical rod 72; the second Y-axis clamping frame 8 is below a second Y-axis connecting seat 81; the second Y-axis connecting seat 81 is provided with a second Y-axis seat vertical rod 82; the second X-axis clamp seat vertical rod 72 and the second Y-axis seat vertical rod 82 are of the same height; the height of the second X-axis clamp seat vertical rod 72 is lower than the height of the first X-axis clamp seat vertical rod 32; after the second X-axis clamping frame 7 and the second Y-axis clamping frame 8 are fixed on the rear of the workbench surface 11 through the second pipe clamping seat 6 and the rotary table 5, the pipe clamping mouths of the first X-axis clamping frame 3, the first Y-axis clamping frame 4, the second X-axis clamping frame 7 and the second Y-axis clamping frame 8 are on the same horizontal plane.

[0045] The second X-axis screw nut in the second X-axis screw assembly; the second X-axis screw nut and the second X-axis sliding block 62 are fixed on the lower end surface of the second X-axis clamp connecting seat 71; the second Y-axis screw nut in the second Y-axis screw assembly; the second Y-axis screw nut and the second Y-axis sliding block 66 are fixed on the lower end surface of the second Y-axis connecting seat 81;

[0046] The second control panel 69 is arranged on the side of the second pipe clamping seat 2, and the second control panel 69 can independently control the start and stop of the second X-axis screw rod driving motor 24 and the second Y-axis screw driving motor 68; the second X-axis screw rod driving motor 64 drives the second X-axis clamping frame 7 to slide on the second X-axis guide rail 61; and the first Y-axis screw rod driving motor 28 drives the second Y-axis clamping frame 8 to slide on the second Y-axis guide rail 65.

[0047] The rotary table 5 rotates the second pipe clamping seat 6, the second X-axis clamping frame 7 or the second Y-axis clamping frame 8 is opposite to the first Y-axis clamping frame 4, the rotary table 5 rotates to keep the second welded elbow pipe 92 and the first welded elbow pipe 91 always on the same horizontal plane, the welding opening of the first welded elbow pipe 91 and the welding opening of the second welded elbow pipe 92 are convenient for butt joint; and the welding forming of the U-shaped pipe or the S-shaped pipe is realized.

Claims

1. An automotive tube bending and welding fixture comprising: The utility model provides a welding workbench, first pipe clamp holder, clamping frame, rotary table (5), second pipe clamp holder (6), its characterized in be: first pipe clamp holder (2) and rotary table (5) are fixed on the upper end surface of welding workbench (1), and first pipe clamp holder (2) is same in structure with second pipe clamp holder (6), and first pipe clamp holder (2) and second pipe clamp holder (6) are all equipped with screw motion pair, and screw motion pair is divided into X -axis screw motion pair and Y -axis screw motion pair, and X -axis screw motion pair and Y -axis screw motion pair are same in structure, and the included angle of X -axis screw motion pair and Y -axis screw motion pair is 90 degrees, and every X -axis screw motion pair and Y -axis screw motion pair are equipped with a clamping frame, and two clamping frames on first pipe clamp holder (2) clamp first welding elbow pipe (91), and two clamping frames on second pipe clamp holder (6) clamp second welding elbow pipe (92), and second pipe clamp holder (6) rotates through rotary table (5), and keeps first welding elbow pipe (91) and second welding elbow pipe (92) on the same level plane welding mouth butt joint, realizes the welding of U -shaped pipe or S -shaped pipe.

2. The automotive tube bending and welding fixture of claim 1, wherein: The clamping frame comprises a clamp connecting seat, a clamp seat vertical rod, a pipe chuck, a chuck cover, a chuck worm, a chuck worm wheel, a centripetal spiral disc and a clamping block clamp jaw, the clamp connecting seat is arranged on the motion pair, the pipe chuck is fixed on the clamp connecting seat through the clamp seat vertical rod, the centripetal spiral disc is fixed on the chuck worm wheel, the chuck worm wheel is connected between the pipe chuck and the chuck cover, the chuck cover is fixed on the pipe chuck, the chuck worm is engaged with the chuck worm wheel, the pipe chuck edge is provided with a U-shaped sliding block groove, the chuck cover is provided with a convex sliding block groove, the U-shaped sliding block groove and the convex sliding block groove are correspondingly arranged to form a sliding block sleeve, the sliding block sleeve is provided with a plurality of clamping blocks, the axes of the plurality of clamping blocks intersect at a point to form a pipe clamping opening, each clamping block is provided with two clamp jaws, the other side of the clamping block is provided with a centripetal thread groove, the centripetal spiral disc is engaged with the centripetal thread groove, the centripetal spiral disc rotates to drive the plurality of clamping blocks to slide in the sliding block sleeve, the plurality of clamping blocks slide centripetally, and the clamp jaws clamp the welding elbow pipe wall.

3. The automotive tube bending and welding fixture of claim 2, wherein: The screw motion pair comprises two guide rails, a sliding block, a screw rod, a screw nut and a screw rod driving motor, the screw rod is arranged between the two guide rails, and the two guide rails and the screw rod are parallel, the sliding block is sleeved on each guide rail, and the screw nut is sleeved on the screw rod, and the sliding block and the screw nut are fixed on the lower end surface of the clamp connecting seat.

4. The automotive tube bending and welding fixture of claim 3, wherein: The screw motion pair arranged in the first pipe clamp holder (2) is a first X-axis screw motion pair and a first Y-axis screw motion pair, and the screw motion pair arranged in the second pipe clamp holder (6) is a second X-axis screw motion pair and a second Y-axis screw motion pair.

5. The automotive tube bending and welding fixture of claim 4, wherein: The clamping frame is divided into: the first X-axis clamping frame (3), the first Y-axis clamping frame (4), the second X-axis clamping frame (7), and the second Y-axis clamping frame (8); the first control plate (29) is further arranged in the first pipe clamping seat (2), the first X-axis clamping frame (3) is arranged on the first X-axis screw motion pair; the first Y-axis clamping frame (4) is arranged on the first Y-axis screw motion pair; the first control plate (29) drives and controls the first X-axis screw motion pair to drive the first X-axis clamping frame (3) to walk on the first pipe clamping seat (2) along the X-axis; the first control plate (29) drives and controls the first Y-axis screw motion pair to drive the first Y-axis clamping frame (4) to walk on the first pipe clamping seat (2) along the Y-axis.

6. The automotive tube bending and welding fixture of claim 5, wherein: The first X-axis pipe clamping opening is arranged on the first X-axis clamping frame (3); the first Y-axis pipe clamping opening is arranged on the first Y-axis clamping frame (4); the first X-axis pipe clamping opening and the first Y-axis pipe clamping opening clamp the two ends of the first welded elbow pipe (91); the second X-axis pipe clamping opening is arranged on the second X-axis clamping frame (7); the second Y-axis pipe clamping opening is arranged on the second Y-axis clamping frame (8); the second X-axis pipe clamping opening and the second Y-axis pipe clamping opening clamp the two ends of the second welded elbow pipe (92); the four pipe clamping openings are on the same horizontal plane.

7. The automotive tube bending and welding fixture of claim 6, wherein: The rotating table (5) comprises a rotating disc base (51), a rotating tray (52), a positioning lock rod (53), and a positioning spring (54); the rotating disc base (51) is provided with a tray shaft joint ring (511); the rotating tray (52) is provided with a tray connecting shaft (521) below; the tray connecting shaft (521) is sleeved in the tray shaft joint ring (511); the positioning lock rod (53) is provided with a positioning lock tongue (531) at one end; the positioning lock tongue (531) is provided with a lock rod connecting shaft (532) beside; the lock rod connecting shaft (532) is connected to one side of the tray shaft joint ring (511); the positioning spring (54) is arranged beside the lock rod connecting shaft (532); the tray connecting shaft (521) is provided with a plurality of positioning clamping grooves (5211) below; the plurality of positioning clamping grooves (5211) are arranged in an annular equidistant array; the positioning spring (54) supports the positioning lock rod (53) to make the positioning lock tongue (531) embedded in the positioning clamping groove (5211).

8. The automotive tube bending and welding fixture of claim 7, wherein: The welding workbench (1) comprises a workbench surface (11), a welding bench foot support (12), and a ground iron (13); the two side edges of the workbench surface (11) are fixed to the ground iron (13) through the welding bench foot support (12); the first pipe clamping seat (2) and the rotating table (5) are fixed on the workbench surface (11) through bolt locking.

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