Clamping tool for girth welding of automobile exhaust gas circulating pipeline

Abstract

The utility model relates to a clamping tool for girth welding of an automobile exhaust gas circulating pipeline, and belongs to the field of clamping tools, and the clamping tool comprises a rack, a first clamping mechanism, a first driving motor for driving the first clamping mechanism to rotate, a second clamping mechanism and a second driving motor for driving the second clamping mechanism to rotate; the rotation axis of the first clamping mechanism coincides with the rotation axis of the second clamping mechanism. The first clamping mechanism comprises a first rotating frame rotationally installed on the rack, a first clamping frame used for arranging a first bent pipe, a sliding driving piece used for driving the first clamping frame to slide and a first clamping piece installed on the first clamping frame and used for being matched with the first clamping frame. The second clamping mechanism comprises a second rotating frame rotationally installed on the rack, a second clamping frame installed on the second rotating frame and used for arranging a second bent pipe, and a second clamping piece installed on the second clamping frame and used for being matched with the second clamping frame. The annular welding device has the effect of facilitating annular welding of the automobile exhaust gas circulating pipeline.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of clamping tools, in particular to a clamping tool for ring welding of an automobile exhaust circulation pipeline. BACKGROUND

[0002] The automobile exhaust circulation pipeline has a function of guiding exhaust gas in an engine into an exhaust system, thereby being discharged into the atmosphere. The automobile exhaust circulation pipeline comprises a first elbow, a second elbow and a bellows connecting the first elbow and the second elbow. The first elbow has a flange welded at one end thereof, and the bellows has a corrugated section and connecting sections connected to both ends of the corrugated section and used for being inserted into end portions of the first elbow and the second elbow. In the production process of the automobile exhaust circulation pipeline, the first elbow and the second elbow are connected with the bellows, and then the first elbow and the second elbow are clamped, and ring welding is performed at the connection between the first elbow and the bellows and the second elbow and the bellows. In view of the related art, the present application provides a clamping tool for ring welding of an automobile exhaust circulation pipeline. CONTENT OF THE UTILITY MODEL

[0003] In order to facilitate the ring welding of the automobile exhaust circulation pipeline, the present application provides a clamping tool for ring welding of an automobile exhaust circulation pipeline.

[0004] The clamping tool for ring welding of an automobile exhaust circulation pipeline provided by the present application adopts the following technical solution:

[0005] The clamping tool for ring welding of an automobile exhaust circulation pipeline comprises a rack, a first clamping mechanism horizontally rotatably mounted on the rack, a first driving motor driving the first clamping mechanism to rotate, a second clamping mechanism horizontally rotatably mounted on the rack and a second driving motor driving the second clamping mechanism to rotate. The rotation axis of the first clamping mechanism coincides with the rotation axis of the second clamping mechanism. The first clamping mechanism comprises a first rotating frame rotatably mounted on the rack, a first clamping frame arranged in a sliding manner along a direction parallel to the rotation axis of the first clamping mechanism and used for arranging the first elbow, a sliding driving member driving the first clamping frame to slide towards the second clamping mechanism and a first clamping member mounted on the first clamping frame and used for cooperating with the first clamping frame. The second clamping mechanism comprises a second rotating frame rotatably mounted on the rack, a second clamping frame mounted on the second rotating frame and used for arranging the second elbow and a second clamping member mounted on the second clamping frame and used for cooperating with the second clamping frame.

[0006] By adopting the technical scheme, in the clamping process of the automobile exhaust circulation pipeline, the first elbow pipe and the second elbow pipe are first inserted into the connecting section of the corrugated pipe, then the first elbow pipe is placed on the first clamping frame of the first clamping mechanism, and the second elbow pipe is placed on the second clamping frame of the second clamping mechanism, the first elbow pipe and the second elbow pipe are locked on the first clamping frame and the second clamping frame through the first clamping piece and the second clamping piece, the first clamping frame is driven to slide towards the direction of the second clamping mechanism through the sliding driving piece, the connection between the first elbow pipe and the corrugated pipe is further improved, and finally the automobile exhaust circulation pipeline is rotated through the driving of the first driving motor and the second driving motor, so as to facilitate the circumferential welding of the automobile exhaust circulation pipeline and improve the precision of the circumferential welding of the automobile exhaust circulation pipeline.

[0007] Optionally, the first clamping frame comprises a first support seat for arranging the first elbow pipe, a first support table for arranging the flange, and a pressing assembly for pressing the flange on the first support table, and the first support seat has a first support groove for arranging the first elbow pipe.

[0008] By adopting the technical scheme, the structure of the first clamping frame is disclosed, wherein the arrangement of the pressing assembly helps to lock the flange on the first support table, thereby locking the first elbow pipe on the first clamping frame. The arrangement of the first support seat helps to provide support force for the first elbow pipe, further improving the stability of the first elbow pipe on the first clamping frame.

[0009] Optionally, the pressing assembly comprises a pressing clamp block hinged to the first support table and used for pressing the flange, and a pressing cylinder driving the pressing clamp block to act.

[0010] By adopting the technical scheme, the structure of the pressing assembly is disclosed, and the pressing clamp block can be quickly and accurately driven by the pressing cylinder to press the flange on the first support table.

[0011] Optionally, the first support table is provided with a limiting protruding column, and the limiting protruding column comprises a mounting column mounted on the first support table and a limiting column arranged at the top end of the mounting column and corresponding to the through hole on the flange.

[0012] By adopting the technical scheme, the arrangement of the limiting column on the limiting protruding column helps to limit the flange, reduces the probability of movement of the flange during rotation, and improves the precision of the circumferential welding of the automobile exhaust circulation pipeline.

[0013] Optionally, the second clamping frame comprises a second support seat for arranging the second elbow pipe, a second support table for supporting the end of the second elbow pipe, a plug-in convex column for plug-in cooperation with the end of the second elbow pipe, and a plug-in driving member for driving the plug-in convex column; the second support seat has a second support groove for arranging the second elbow pipe; and the second support table has a mounting through slot for the plug-in convex column to pass through.

[0014] By adopting the technical scheme, the structure of the second clamping seat is disclosed. In the clamping process of the second elbow pipe, the second elbow pipe abuts against the second support groove of the second support seat, and the end of the second elbow pipe abuts against the second support table. The plug-in convex column is driven to rise by the plug-in driving member, so that the plug-in convex column can be inserted into the end of the second elbow pipe to limit the second elbow pipe. This helps to improve the stability of the second elbow pipe on the second clamping frame and reduce the probability of movement of the second elbow pipe during rotation.

[0015] Optionally, the first clamping member comprises a first pressing block and a first driving cylinder for driving the first pressing block to act, and the second clamping member comprises a second pressing block and a second driving cylinder for driving the second pressing block to act; the first pressing block has a first arrangement groove for arranging the first elbow pipe, and the second pressing block has a second arrangement groove for arranging the second elbow pipe.

[0016] By adopting the technical scheme, the structures of the first clamping member and the second clamping member are disclosed. The first pressing block can be precisely and quickly pressed on the first clamping frame by the first driving cylinder, and the second pressing block can be precisely and quickly pressed on the second clamping frame by the second driving cylinder. The first arrangement groove and the second arrangement groove are adapted to the first elbow pipe and the second elbow pipe, which improves the stability of the first elbow pipe on the first clamping frame and the stability of the second elbow pipe on the second clamping frame, and reduces the probability of movement of the first elbow pipe and the second elbow pipe during rotation, thereby helping to improve the precision of the circular welding of the automobile exhaust circulation pipeline.

[0017] Optionally, the connection between the piston rod of the first clamping cylinder and the first pressing block and the connection between the piston rod of the second clamping cylinder and the second pressing block are in a transmission connecting rod structure.

[0018] By adopting the technical scheme, the compactness of the structure of the clamping tool for the circular welding of the automobile exhaust circulation pipeline is improved by the transmission connecting rod structure. The transmission connecting rod is driven to act by the first clamping cylinder and the second clamping cylinder, so as to realize the precise clamping of the first elbow pipe and the second elbow pipe.

[0019] Optionally, a support mechanism for arranging the corrugated pipe is further arranged between the first clamping mechanism and the second clamping mechanism, and the support mechanism comprises a limiting seat for arranging the corrugated pipe and a lifting driving member for driving the limiting seat to lift.

[0020] By adopting the technical scheme, the support mechanism is arranged to support the bellows, the lowering of the limiting seat is driven by the lifting driving element, the bellows is in a suspended state, the friction between the bellows and the limiting seat is reduced, and the rotation of the automobile exhaust circulation pipeline is facilitated.

[0021] Optionally, the limiting seat has a third arrangement groove for arranging the bellows segment and an arc-shaped limiting groove arranged at both ends of the third arrangement groove and used for arranging the connecting segment of the bellows.

[0022] By adopting the technical scheme, the third arrangement groove and the arc-shaped limiting groove in the limiting seat are arranged to be matched with the structure of the bellows, the bellows is supported, and the stability of the connection between the first elbow pipe and the second elbow pipe and the bellows is improved.

[0023] Optionally, the sliding driving element is a sliding cylinder, and the first clamping frame is connected to the piston rod of the sliding cylinder; the first rotating frame has a guide plate, and the first clamping frame is attached to the guide plate and slides along the guide plate.

[0024] By adopting the technical scheme, the sliding cylinder is used as the sliding driving element, the sliding of the first clamping frame is efficient and convenient, and the guide plate is arranged to guide the sliding of the first clamping frame and reduce the probability of deviation of the first clamping frame during the sliding.

[0025] In summary, the present application has at least one of the following beneficial technical effects:

[0026] 1. A clamping tool for the girth welding of an automobile exhaust circulation pipeline, the first elbow pipe is clamped by the cooperation of the first clamping frame and the first clamping element, the second elbow pipe is clamped by the cooperation of the second clamping frame and the second clamping element, the cooperation between the first elbow pipe and the bellows is further improved by driving the first clamping frame to slide towards the second clamping frame by the sliding driving element, and finally the rotation of the automobile exhaust circulation pipeline is driven by the first driving motor and the second driving motor, which facilitates the girth welding of the automobile exhaust circulation pipeline and the girth welding precision is ideal.

[0027] 2. The arrangement of the pressing assembly on the first clamping frame, the arrangement of the insertion protruding column on the second clamping frame, and the arrangement of the first clamping element and the second clamping element facilitate the stability of the first elbow pipe and the second elbow pipe on the first clamping frame and the second clamping frame, and facilitate the precision of the girth welding of the automobile exhaust circulation pipeline.

[0028] 3. The support mechanism is arranged between the first clamping mechanism and the second clamping mechanism, which facilitates the support of the bellows and improves the stability of the connection between the first elbow pipe and the second elbow pipe and the bellows. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 This is a schematic diagram of the vehicle exhaust gas recirculation pipe in this embodiment.

[0030] Figure 2 This is a schematic diagram of the clamping fixture used for circumferential welding of automotive exhaust gas recirculation pipes in this embodiment.

[0031] Figure 3 This is a schematic diagram of the first clamping mechanism in this embodiment.

[0032] Figure 4 This is a cross-sectional schematic diagram of the cooperation between the first rotating frame and the first clamping frame in this embodiment.

[0033] Figure 5 This is a schematic diagram of the clamping component in this embodiment.

[0034] Figure 6 yes Figure 3 A magnified view of a portion of point A in the middle.

[0035] Figure 7 This is a schematic diagram of the second clamping mechanism in this embodiment.

[0036] Figure 8 This is a cross-sectional schematic diagram of the insertion protrusion and the second support platform in this embodiment.

[0037] Figure 9 yes Figure 7 A magnified view of a portion of point B in the middle.

[0038] Figure 10 This is a schematic diagram of the support mechanism in this embodiment.

[0039] Explanation of reference signs: 1, first elbow pipe; 11, first straight pipe part; 12, second straight pipe part; 13, first elbow pipe part; 14, flange; 2, second elbow pipe; 21, third straight pipe part; 22, fourth straight pipe part; 23, second elbow pipe part; 3, corrugated pipe; 31, corrugated pipe section; 32, first joint; 33, second joint; 4, rack; 41, support frame; 42, first driving motor; 43, second driving motor; 441, limiting seat; 4411, third arrangement groove; 4412, arc-shaped limiting groove; 442, lifting driving piece; 51, first rotating frame; 511, guide flat plate; 512, guide sliding block; 52, first clamping frame; 521, guide sliding rail; 522, first support seat; 5221, first support groove; 523, first support table; 5241, mounting stand column; 5242, limiting stand column; 53, sliding displacement cylinder; 541, first pressing block; 5411, first arrangement groove; 542, first driving cylinder; 5421, first mounting block; 543, first connecting rod; 544, first fork seat; 551, pressing connecting rod; 552, pressing plate; 553, pressing cylinder; 554, pressing seat; 61, second rotating frame; 62, second clamping frame; 621, second support seat; 6211, second support groove; 622, second support table; 623, plug-in convex column; 624, plug-in driving piece; 631, second pressing block; 6311, second arrangement groove; 632, second driving cylinder; 6321, second mounting block; 633, second connecting rod; 634, second fork seat. DETAILED DESCRIPTION

[0040] The following will be described in detail below with reference to the accompanying drawings. Figures 1-10 The present application is further described in detail. The embodiments of the present application disclose a clamping tool for automobile exhaust circulation pipe girth welding. With reference to the drawings, the embodiments of the present application are described in detail. Figure 1, the automobile exhaust circulation pipeline comprises a first elbow 1, a second elbow 2 and a corrugated pipe 3 connecting the first elbow 1 and the second elbow 2. The first elbow 1 has a first straight pipe part 11, a second straight pipe part 12 and a first elbow part 13 between the first straight pipe part 11 and the second straight pipe part 12. The end of the first straight pipe part 11 is welded with a flange 14. The flange 14 has two symmetrical through holes. The second elbow 2 has a third straight pipe part 21, a fourth straight pipe part 22 and a second elbow part 23 between the third straight pipe part 21 and the fourth straight pipe part 22. The corrugated pipe 3 comprises a corrugated pipe section 31, a first joint 32 connected to one end of the corrugated pipe section 31 and a second joint 33 connected to the other end of the corrugated pipe section 31. When the automobile exhaust circulation pipeline is assembled, the first joint 32 of the corrugated pipe 3 is inserted into the second straight pipe part 12 of the first elbow 1, and the second joint 33 of the corrugated pipe 3 is inserted into the fourth straight pipe part 22 of the second elbow 2. Since the clamping tool for the automobile exhaust circulation pipeline girth welding in the embodiment is arranged for the first elbow 1, the second elbow 2 and the corrugated pipe 3, the subsequent first elbow 1, the second elbow 2, the corrugated pipe 3 and their related features can be directly referred to Figure 1 , without referring to the drawings separately.

[0041] Referring to Figure 2 A clamping tool for automobile exhaust circulation pipeline girth welding comprises a rack 4, a support frame 41 mounted on the top surface of the rack 4, a first clamping mechanism horizontally and rotatably mounted on the support frame 41, a first drive motor 42 mounted on the side of the support frame 41 away from the first clamping mechanism and used to drive the first clamping mechanism to rotate, a second clamping mechanism horizontally and rotatably mounted on the support frame 41, a second drive motor 43 mounted on the side of the support frame 41 away from the second clamping mechanism, and a support mechanism mounted on the support frame 41 and located between the first clamping mechanism and the second clamping mechanism. The rotation axis of the first clamping mechanism coincides with the rotation axis of the second clamping mechanism.

[0042] Referring to Figure 3 and Figure 4The first clamping mechanism comprises a first rotating frame 51 rotatably mounted on the support frame 41, a first clamping frame 52 arranged to slide along a direction parallel to a rotating axis of the first clamping mechanism and used to arrange the first elbow pipe 1, a sliding driving member mounted on the first rotating frame 51 and used to drive the first clamping frame 52 to slide towards the second clamping mechanism, and a first clamping member mounted on the first clamping frame 52 and used to clamp the second straight pipe portion 12 of the first elbow pipe 1 in cooperation with the first clamping frame 52. In the embodiment, the sliding driving member is a sliding cylinder 53, and the first clamping frame 52 is connected to a piston rod of the sliding cylinder 53. The first rotating frame 51 has a guide flat plate 511, and a guide sliding block 512 is arranged at the guide flat plate 511. The first clamping frame 52 is provided with a guide sliding rail 521 matched with the guide sliding block 512. In the embodiment, two guide sliding rails 521 are arranged on the first clamping frame 52.

[0043] With reference to Figure 3 The first clamping frame 52 comprises a first support base 522, a first support table 523 used to arrange the flange 14, and a pressing assembly mounted on the first support table 523 and used to press the flange 14 against the first support table 523. In the embodiment, the first support base 522 has a first support groove 5221 used to abut against the lower end of the second straight pipe portion 12 of the first elbow pipe 1.

[0044] With reference to Figure 5 The pressing assembly comprises a pressing connecting rod 551 hingedly connected to the first support table 523, a pressing plate 552 hingedly connected to the pressing connecting rod 551 and used to press the flange 14 against the first support table 523, a pressing cylinder 553 mounted on a back surface of the first support table 523 and used to drive the pressing plate 552 to act, and a pressing base 554 mounted on an end portion of a piston rod of the pressing cylinder 553 and used to hinge an end portion of the pressing plate 552. In the embodiment, the first support table 523 has a through hole used to pass the piston rod of the pressing cylinder 553, and the pressing plate 552 is concave and used to press two ends of the flange 14. A top surface of the first support table 523 is further provided with a limiting protruding column used to limit the flange 14, which comprises a mounting column 5241 mounted on the top surface of the first support table 523 and a limiting column 5242 arranged on a top surface of the mounting column 5241 and matched with a through hole on the flange 14.

[0045] With reference to Figure 3 and Figure 6, the first clamping member includes a first pressing block 541, a first driving cylinder 542 driving the first pressing block 541 to act, and a first transmission linkage connecting the first pressing block 541 and the piston rod of the first driving cylinder 542. The first pressing block 541 has a first arrangement groove 5411 for arranging the first elbow pipe part 13 of the first elbow pipe 1. The first driving cylinder 542 is installed on the first clamping frame 52, and the top end of the shell of the first driving cylinder 542 is provided with a first mounting block 5421 by screwing. The first transmission linkage includes a first linkage 543 hinged between the first mounting block 5421 and the first pressing block 541, and a first fork seat 544 installed on the piston rod of the first driving cylinder 542 and hinged to the tail end of the first pressing block 541. Through the action of the first driving cylinder 542, the first pressing block 541 can be pressed into the first support groove 5221 of the first support seat 522.

[0046] With reference to Figure 7 and Figure 8 , the second clamping mechanism is arranged opposite to the first clamping mechanism. The second clamping mechanism includes a second rotating frame 61 rotatably installed on the support frame 41, a second clamping frame 62 installed on the second rotating frame 61 and used for arranging the second elbow pipe 2, and a second clamping member installed on the second clamping frame 62 and cooperating with the second clamping frame 62 to clamp the fourth straight pipe part 22. The second clamping frame 62 includes a second support seat 621 for arranging the fourth straight pipe part 22 of the second elbow pipe 2, a second support table 622 for supporting the third straight pipe part 21 of the second elbow pipe 2, a plug-in protruding column 623 for being inserted into the second elbow pipe 2, and a plug-in driving member 624 driving the plug-in protruding column 623 to stretch and retract. The second support seat 621 has a second support groove 6211 for abutting against the fourth straight pipe part 22 of the second elbow pipe 2, and the second support table 622 has a through hole for the plug-in protruding column 623 to pass through.

[0047] With reference to Figure 7 and Figure 9 , the second clamping member includes a second pressing block 631, a second driving cylinder 632 driving the second pressing block 631 to act, and a second transmission linkage connecting the second pressing block 631 and the piston rod of the second driving cylinder 632. The second pressing block 631 has a second arrangement groove 6311 for arranging the second elbow pipe part 23 of the second elbow pipe 2, and the top end of the shell of the second driving cylinder 632 is provided with a second mounting block 6321 by screwing. The second transmission linkage includes a second linkage 633 hinged between the second mounting block 6321 and the second pressing block 631, and a second fork seat 634 installed on the piston rod of the second driving cylinder 632 and hinged to the tail end of the second pressing block 631. Through the action of the second driving cylinder 632, the second pressing block 631 can be pressed into the second support groove 6211 of the second support seat 621.

[0048] Referring to Figure 2 and Figure 10 The support mechanism is arranged between the first clamping mechanism and the second clamping mechanism and is used for arranging the corrugated pipe 3. The support mechanism comprises a limiting seat 441 and a lifting drive 442 for driving the limiting seat 441 to lift. The limiting seat 441 has a third arrangement groove 4411 for arranging the corrugated section of the corrugated pipe 3 and an arc-shaped limiting groove 4412 arranged at both ends of the third arrangement groove 4411 and used for arranging the connecting section of the corrugated pipe 3.

[0049] The implementation principle of the clamping tool for the girth welding of the automobile exhaust circulation pipeline according to the embodiment of the application is as follows: in the clamping process of the automobile exhaust circulation pipeline, first, the first joint 32 of the corrugated pipe 3 is inserted into the second straight pipe section 12 of the first elbow pipe 1, and the second joint 33 of the corrugated pipe 3 is inserted into the fourth straight pipe section 22 of the second elbow pipe 2, then the first elbow pipe 1 is placed on the first clamping seat, the second elbow pipe 2 is arranged on the second clamping seat, the corrugated pipe 3 is located in the limiting seat 441 of the support mechanism, the first clamping frame 52 is driven to slide towards the second clamping frame 62 by the sliding drive, the connection between the first elbow pipe 1 and the corrugated pipe 3 is further improved, the first elbow pipe 1 and the second elbow pipe 2 are locked on the first clamping frame 52 and the second clamping frame 62 by the driving of the first drive cylinder 542 and the second drive cylinder 632, and finally the rotation of the first clamping mechanism and the second clamping mechanism is driven by the first drive motor 42 and the second drive motor 43, so that the rotation of the automobile exhaust circulation pipeline is realized, the girth welding of the automobile exhaust circulation pipeline is facilitated, and the welding precision is ideal.

[0050] The above are the preferred embodiments of the application, and do not limit the protection scope of the application, so that: any equivalent changes made according to the structure, shape, principle of the application should be covered in the protection scope of the application.

Claims

1. A clamping tool for the circumferential welding of an exhaust gas recirculation pipe of a motor vehicle, characterized in that The first clamping mechanism includes a first rotating frame (51) rotatably mounted on the rack (4), a first clamping frame (52) arranged to slide along a direction parallel to the rotating axis of the first clamping mechanism and used for arranging the first elbow pipe (1), a sliding driving member driving the first clamping frame (52) to slide towards the second clamping mechanism, and a first clamping member mounted on the first clamping frame (52) and used for cooperating with the first clamping frame (52); the second clamping mechanism includes a second rotating frame (61) rotatably mounted on the rack (4), a second clamping frame (62) mounted on the second rotating frame (61) and used for arranging the second elbow pipe (2), and a second clamping member mounted on the second clamping frame (62) and used for cooperating with the second clamping frame (62).

2. The clamping tool for the circular welding of the exhaust gas circulation pipe of an automobile according to claim 1, characterized in that, The first clamping frame (52) includes a first support seat (522) for arranging the first elbow pipe (1), a first support table (523) for arranging the flange (14), and a pressing assembly (55) for pressing the flange (14) on the first support table (523), and the first support seat (522) has a first support groove (5221) for arranging the first elbow pipe (1).

3. The clamping tool for the circular welding of the exhaust gas circulation pipe of an automobile according to claim 2, characterized in that, The first support table (523) is provided with a limiting protruding column, which includes a mounting column (5241) mounted on the first support table (523) and a limiting column (5242) arranged at the top end of the mounting column (5241) and corresponding to the through hole on the flange (14).

4. The clamping tool for the circular welding of the exhaust gas circulation pipe of an automobile according to claim 1, characterized in that, The second clamping frame (62) includes a second support seat (621) for arranging the second elbow pipe (2), a second support table (622) for supporting the end of the second elbow pipe (2), a plug-in protruding column (623) for plug-in cooperation with the end of the second elbow pipe (2), and a plug-in driving member (624) for driving the plug-in protruding column (623); the second support seat (621) has a second support groove (6211) for arranging the second elbow pipe (2); and the second support table (622) has a through hole for the plug-in protruding column (623) to pass through.

5. The clamping tool for the circular welding of the exhaust gas circulation pipe of an automobile according to claim 1, characterized in that, The first clamping member includes a first pressing block (541) and a first driving cylinder (542) driving the first pressing block (541) to act, and the second clamping member includes a second pressing block (631) and a second driving cylinder (632) driving the second pressing block (631) to act; the first pressing block (541) has a first arrangement groove (5411) for arranging the first elbow pipe (1), and the second pressing block (631) has a second arrangement groove (6311) for arranging the second elbow pipe (2).

6. A clamping tool for circumferential welding of an exhaust gas recirculation pipe of a motor vehicle according to claim 5, characterized in that The connection between the piston rod of the first driving cylinder (542) and the first pressing block (541) and the piston rod of the second driving cylinder (632) and the second pressing block (631) is a transmission connecting rod structure.

7. The clamping tool for the circular welding of the exhaust gas circulation pipe of an automobile according to claim 1, characterized in that, The first clamping mechanism and the second clamping mechanism are further provided with a support mechanism for arranging the corrugated pipe (3), which comprises a limiting seat (441) for arranging the corrugated pipe (3) and a lifting driving element (442) for driving the limiting seat (441) to lift.

8. The clamping tool for the circular welding of the exhaust gas circulation pipe of an automobile according to claim 7, characterized in that, The limiting seat (441) has a third arrangement groove (4411) for arranging the corrugated segment of the corrugated pipe (3) and an arc-shaped limiting groove (4412) arranged at both ends of the third arrangement groove (4411) and used for arranging the connecting segment of the corrugated pipe (3).

9. The clamping tool for the circular welding of the exhaust gas circulation pipe of an automobile according to claim 1, characterized in that, The sliding driving element is a sliding cylinder (53), and the first clamping frame (52) is connected to the piston rod of the sliding cylinder (53); the first rotating frame (51) has a guide flat plate (511), and the first clamping frame (52) is attached to the guide flat plate (511) and slides along the guide flat plate (511).

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