CN216633102U

CN216633102U - Quick-change welding tool for multiple sheet metal parts of rear longitudinal beam

Info

Publication number: CN216633102U
Application number: CN202122365638.3U
Authority: CN
Inventors: 吴一帆
Original assignee: Guiyang Dadong Auto Parts Co ltd
Current assignee: Guiyang Dadong Auto Parts Co ltd
Priority date: 2021-09-28
Filing date: 2021-09-28
Publication date: 2022-05-31
Anticipated expiration: 2031-09-28

Abstract

The utility model provides a quick-change welding tool for a plurality of sheet metal parts of a rear longitudinal beam, which comprises a welding fixture and a connecting base fixed on the ground, wherein the welding fixture comprises a clamping platform, telescopic legs positioned on the front side and the rear side of the connecting base are arranged at the bottom of the clamping platform, and moving wheels positioned on the outer sides of the telescopic legs are arranged at the bottom of the clamping platform; be equipped with two tip anchor clamps on the clamping platform, be equipped with a plurality of fixture in proper order from the past backward between two tip anchor clamps, and two opposite one sides of tip anchor clamps all are equipped with the girder positioning mechanism who is used for the girder location of slot-shaped, two girder positioning mechanisms all are located the girder under, and two positioning mechanism all including stretching out the end positioning cylinder up, the end that stretches out of end positioning cylinder is connected with the girder locating pin, stretch into the locating hole of girder tank bottom through the girder locating pin and fix a position.

Description

Quick-change welding tool for multiple sheet metal parts of rear longitudinal beam

Technical Field

The utility model relates to the technical field of auto part welding, in particular to a quick-change welding tool for a plurality of sheet metal parts of a rear longitudinal beam.

Background

The rear longitudinal beam is an important supporting part of an automobile body bearing system and is formed by welding a groove-shaped main beam and a sheet metal part matched with the main beam in a combined mode. Because the auto-parts that the back longeron needs to be connected are more, and the number of sheet metal pieces of welding at the girder of slot-like is also more, need have different welding processes usually just can accomplish, and every welding process needs a plurality of sheet metal components of welding, and every sheet metal component usually need carry out the centre gripping on the welding frock of difference and fix, weld again.

Common back longeron welding set all constitutes through a welding robot and the welding frock that corresponds, but because longeron length, crooked curvature and direction are all inequality behind the different motorcycle types, if all reassemble a welding robot to different motorcycle types, both time-wasting also occupy the space in workshop, simultaneously, increase equipment cost. Therefore, different welding tools need to be replaced for the rear longitudinal beams of different vehicle types. Therefore, a quick-change welding tool for the rear longitudinal beam multi-sheet metal part is researched and developed.

SUMMERY OF THE UTILITY MODEL

The utility model aims to at least solve the technical problems in the prior art, and particularly provides a quick-change welding tool for a rear longitudinal beam multi-sheet metal part, which can be used for replacing the whole welding fixture and is provided with different clamping mechanisms aiming at sheet metal parts with different shapes and positions so as to improve the clamping stability.

In order to achieve the purpose, the utility model provides a rear longitudinal beam multi-sheet metal part quick-change welding tool which comprises a welding fixture and a connecting base fixed on the ground, wherein first positioning plates extending left and right are respectively arranged on the top surface of the connecting base close to the front side and the rear side, positioning columns are respectively arranged on the first positioning plates, second positioning plates extending left and right and corresponding to the first positioning plates are arranged on the bottom side of the welding tool, positioning holes for the positioning columns to penetrate through are formed in the second positioning plates, vertically coincident mounting through holes are further formed in the first positioning plates and the second positioning plates, and the first positioning plates and the second positioning plates are locked together through the mounting through holes by combining bolts and nuts, so that the welding tool is fixed on the connecting base;

the welding fixture comprises a clamping platform, telescopic supporting legs positioned on the front side and the rear side of the connecting base are arranged at the bottom of the clamping platform, and moving wheels positioned on the outer sides of the telescopic supporting legs are arranged at the bottom of the clamping platform; the clamping platform is provided with two end clamps, a plurality of clamping mechanisms are sequentially arranged between the two end clamps from front to back, one sides of the two end clamps opposite to each other are respectively provided with a main beam positioning mechanism for positioning a groove-shaped main beam, the two main beam positioning mechanisms are positioned under the main beam, each of the two positioning mechanisms comprises an end positioning cylinder with an upward extending end, the extending end of each end positioning cylinder is connected with a main beam positioning pin, and each end positioning pin extends into a positioning hole in the bottom of the main beam to perform positioning;

the end clamps comprise mounting bases and end clamping cylinders fixed on the mounting bases; the mounting base of the end clamp is also hinged with an end pressure arm extending left and right; the end part clamping cylinder is fixed on the left side of the mounting base, the end part pressure arm is hinged on the mounting base, the right end of the end part pressure arm is hinged with the extending end of the end part clamping cylinder, the end part clamping cylinder drives the end part pressing arm to press downwards, the top part of the mounting base is provided with a clamping gap which is matched with the groove-shaped main beam in a downward concave way, two L-shaped clamping support columns which are respectively positioned at the two sides of the clamping gap are arranged at the left and the right of the top of the mounting base at intervals, the two L-shaped clamping support columns are arranged oppositely, the notch skirts at the left side and the right side of the main beam are respectively arranged at the top ends of the two L-shaped clamping support columns, the bottom of the end pressure arm is provided with a lower pressure block corresponding to the two clamping support columns, the notch skirt of the main beam is clamped by the clamping support columns and the lower pressing blocks, and the main beam lateral abutting blocks used for abutting against the left side wall and the right side wall of the main beam are arranged on one sides, opposite to the vertical rods, of the two L-shaped clamping support columns.

In the scheme, the method comprises the following steps: the clamping mechanisms are six and sequentially comprise a first clamping mechanism, a second clamping mechanism, a third positioning detection mechanism, a fourth clamping mechanism, a fifth clamping mechanism and a sixth clamping mechanism from front to back, the first clamping mechanism comprises a first left base and a first right base which are respectively positioned on the left side and the right side of the main beam, the first left base is positioned on the front side of the first right base, a first clamping cylinder with an upward extending end is arranged on the left side of the first left base, a first pressure arm extending leftwards and rightwards is hinged to the top of the first left base, the left end of the first pressure arm is hinged to the extending end of the first clamping cylinder, the right end of the first pressure arm extends to the upper side of the main beam, a first pressure claw extending into the main beam is arranged on the rear side of the first pressure arm, and the bottom of the first sheet metal part is pressed in a groove of the main beam through the first pressure claw;

a first positioning cylinder with an upward extending end is arranged on the front side of the first right base, a first supporting claw located right below the first pressing claw is arranged at the extending end of the first positioning cylinder, claw teeth of the first supporting claw and claw teeth of the first pressing claw are arranged in a vertically corresponding mode, a first vertical positioning pin located on the left side of the first supporting claw is further arranged at the extending end of the first positioning cylinder, and the first vertical positioning pin sequentially penetrates through a main beam positioning hole and a first sheet metal part positioning hole;

two first skirt edge pressure bars extending backwards are arranged on the first pressure arm at intervals from left to right, and the skirt edges of notches on the two sides of the main beam are compressed through the two first skirt edge pressure bars; the first left base is provided with a first skirt edge abutting rod which extends backwards and is positioned below the first skirt edge pressure rod, notch skirt edges on two sides of the main beam are clamped between the tail end of the first skirt edge abutting rod and the tail end of the first skirt edge pressure rod, the top of the first right base is provided with a first skirt edge abutting block which vertically corresponds to the tail end of the first skirt edge pressure rod on the right side, the first skirt edge abutting rod and the first right base are oppositely provided with a first lateral abutting block, and the first lateral abutting block abuts against the left side surface and the right side surface of the main beam;

a main beam detection sensor extending into the main beam is arranged on the first skirt edge pressure lever; and a first metal plate detection sensor positioned in the main beam is arranged on the first pressure arm.

In the scheme, the method comprises the following steps: the second clamping mechanism comprises a second left base and a second right base which are respectively positioned on the left side and the right side of the main beam, a second clamping cylinder with an upward extending end is arranged on the left side of the second left base, a second pressing arm extending left and right is hinged to the top of the second left base, the left end of the second pressing arm is hinged to the extending end of the second clamping cylinder, the right end of the second pressing arm extends to the upper side of the main beam, a second pressing cylinder is arranged on the second pressing arm, the second pressing cylinder is positioned in a main beam groove when the second pressing arm is transversely arranged, the extending end of the second pressing cylinder is downward arranged, a second pressing claw is arranged at the extending end of the second pressing cylinder, claw teeth of the second pressing claw are respectively positioned on the front side and the rear side of the second pressing cylinder, and second sheet metal parts and third sheet metal parts positioned on the front side and the rear side of the second pressing cylinder are pressed in the main beam groove through the claw teeth of the second pressing claw; a second clamping positioning pin inserted into a positioning hole in the main beam is arranged on the front side of the second pressing claw;

a second positioning cylinder with an upward extending end is arranged on the second right base, a second abutting claw positioned under the second pressing claw is arranged at the extending end of the second positioning cylinder, claw teeth of the second abutting claw and claw teeth of the second pressing claw are abutted with each other, a second sheet metal positioning pin sequentially penetrating through the main beam positioning hole and the second sheet metal part positioning hole is further arranged on the claw teeth on the front side of the second abutting claw, the top end of the second sheet metal positioning pin is abutted with the bottom end of the claw teeth of the second pressing claw, a third sheet metal positioning pin sequentially penetrating through the main beam positioning hole and the third sheet metal part positioning hole is further arranged on the claw teeth on the rear side of the second abutting claw, and the top end of the third sheet metal positioning pin is abutted with the bottom end of the claw teeth of the second pressing claw;

the second pressing claw is also provided with a second sheet metal detection sensor used for abutting against the rear side of the second sheet metal part and a third sheet metal detection sensor used for abutting against the bottom of a third sheet metal part, and a second left base and a second right base are oppositely provided with second lateral abutting blocks which abut against the left side surface and the right side surface of the main beam through the second lateral abutting blocks; the second pressing claw is further provided with a second skirt pressing block located on the rear side of the second pressing cylinder, a second skirt abutting block vertically corresponding to the second skirt pressing block is arranged on the right second base, the notch skirt on the right side of the main beam is clamped by the second skirt pressing block and the second skirt abutting block, a second skirt pressing rod extending backwards is arranged on the second pressing arm, a second skirt abutting block is also arranged on the left second base, and the second skirt abutting block vertically corresponds to the tail end of the second skirt pressing rod.

In the scheme, the method comprises the following steps: the third positioning detection mechanism comprises a third base located on the left side of the main beam, a third positioning cylinder with a stretching end arranged towards the left side is arranged on the third base, a third pressing arm vertically extending is hinged to the stretching end of the third positioning cylinder, the middle of the third pressing arm is hinged to the left side of the third base through a hinge pin, a lateral abutting cylinder with a stretching end arranged towards the left side is arranged on the third pressing arm, and a left side detection sensor used for detecting the left side wall of the main beam is arranged at the stretching end of the lateral abutting cylinder.

In the scheme, the method comprises the following steps: the fourth clamping mechanism comprises a fourth base located below the main beam, a fourth clamping cylinder with an upward extending end is arranged on the left side of the fourth base, a fourth pressing arm extending leftwards and rightwards is hinged to the top of the fourth base, the left end of the fourth pressing arm is hinged to the extending end of the fourth clamping cylinder, the right end of the fourth pressing arm extends to the upper side of the main beam, two in-groove pressing rods extending into grooves of the main beam are arranged on the bottom of the fourth pressing arm at intervals leftwards and rightwards, a fourth groove bottom abutting block corresponding to the two in-groove pressing rods in the vertical direction is arranged on the upper side of the fourth base, and the groove bottom of the main beam is tightly pressed and fixed between the in-groove pressing rods and the fourth groove bottom abutting block;

a fourth skirt-edge pressing block is arranged at the right end of the fourth pressing arm, and a fourth skirt-edge abutting block vertically corresponding to the fourth skirt-edge pressing block is arranged at the right side of the fourth base; and a fourth main beam detection sensor is connected to the groove bottom pressure lever close to the left side.

In the scheme, the method comprises the following steps: the fifth clamping mechanism comprises a fifth base, a fifth clamping cylinder with an upward extending end is arranged on the left side of the fifth base, a fifth pressing arm extending leftwards and rightwards is hinged to the top of the fifth base, the left end of the fifth pressing arm is hinged to the extending end of the fifth clamping cylinder, the right end of the fifth pressing arm extends to the upper side of the main beam, a fifth pressing cylinder with a downward extending end is arranged on the fifth pressing arm, a fifth pressing claw is arranged at the extending end of the fifth pressing cylinder and comprises a plurality of in-groove claw teeth extending into the groove of the main beam, the right end of the fifth base extends to the right side of the main beam from the lower side of the main beam, a fifth groove bottom abutting block located right below the fifth pressing claw is arranged on the fifth base, the main beam and the main beam located below the main beam are clamped through the fifth groove bottom abutting block and the fifth pressing claw, the right side of the main beam extends to the right side of the main beam, and a fourth sheet metal part is arranged on the main beam, an outer metal plate pressing cylinder with an upward extending end is arranged at the right end of the fifth base, an outer metal plate pressing block is arranged at the extending end of the outer metal plate pressing cylinder, an outer metal plate abutting block which vertically corresponds to the outer metal plate pressing block is arranged on the fifth base, the chassis is clamped between the outer metal plate pressing block and the outer metal plate abutting block, and a fourth metal plate part placed on the chassis is pressed with the chassis through the outer metal plate pressing block and the outer metal plate abutting block; a chassis detection sensor for detecting a chassis is arranged on the front side of the outer metal plate abutting block;

the fifth base is further provided with an outer metal plate positioning mechanism used for positioning the chassis and the fourth metal plate part, the outer metal plate positioning mechanism comprises an outer metal plate positioning cylinder with an upward extending end, the extending end of the outer metal plate positioning cylinder is provided with a plurality of outer metal plate positioning pins arranged at intervals in the front-back direction, and the outer metal plate positioning pins sequentially penetrate through the chassis and positioning holes overlapped with the fourth metal plate part;

and a fifth skirt pressing block extending to the notch skirt at the right side of the main beam is further arranged at the top of the fifth pressing claw, and the notch skirt at the right side of the main beam is pressed at the top of the fourth sheet metal part through the fifth skirt pressing block.

In the scheme, the method comprises the following steps: the sixth clamping mechanism comprises a sixth base, a sixth clamping cylinder with an upward extending end is arranged on the left side of the sixth base, a sixth pressure arm extending leftwards and rightwards is hinged to the top of the sixth base, the left end of the sixth pressure arm is hinged to the extending end of the sixth clamping cylinder, the right end of the sixth pressure arm extends to the position right above the main beam, and a sixth pressure rod extending into the groove of the main beam is arranged on the sixth pressure arm; the right end of the sixth base extends to the right side of the main beam from the lower part of the main beam, a sixth groove bottom abutting block which vertically corresponds to the sixth pressure rod is arranged on the sixth base, and the groove bottom of the main beam is clamped and fixed between the sixth pressure rod and the sixth groove bottom abutting block;

a sixth positioning cylinder positioned right below the main beam is arranged on the front side of the sixth base, the extending end of the sixth positioning cylinder is arranged upwards, and a positioning bolt inserted into a positioning hole in the bottom of the main beam groove is fixed at the extending end of the sixth positioning cylinder;

the rear side of sixth base is equipped with and is located the left side direction panel beating of girder and compresses tightly the cylinder, the side direction panel beating compresses tightly stretching out of cylinder and holds towards the right setting, and the side direction panel beating compresses tightly stretching out of cylinder and is equipped with and is located the left side direction depression bar of girder, the right side of side direction depression bar is equipped with and supplies to be located the draw-in groove that the left fifth sheet metal component left side card of girder is gone into, the tank bottom of draw-in groove is equipped with the fixed bolt that extends right, inserts in the locating hole of extending about the fifth sheet metal component through fixed bolt, the right side of side direction depression bar is equipped with and is located the fifth panel beating detection sensor under the fifth sheet metal component.

In the scheme, the method comprises the following steps: and a first auxiliary pressing cylinder with a stretching end arranged towards the right is arranged on a fourth base of the fourth clamping mechanism, and the stretching end of the first auxiliary pressing cylinder is provided with a first auxiliary pressing block used for pressing the front end of the left side wall of the fourth sheet metal part on the right side wall of the main beam.

In the scheme, the method comprises the following steps: and a second auxiliary pressing cylinder with an extending end arranged towards the right is arranged on a sixth base of the sixth clamping mechanism, and a second auxiliary pressing block used for pressing the rear end of the left side wall of the fourth sheet metal part on the right side wall of the main beam is arranged on the second auxiliary pressing cylinder.

In the scheme, the method comprises the following steps: the main beam positioning mechanism arranged close to the front side is fixed on the front side of the first base; the main beam positioning mechanism arranged close to the front side is fixed at the front side of the mounting base of the end clamp arranged close to the rear side; and a heightening step is arranged on the left side of the connecting base.

In summary, due to the adoption of the technical scheme, the utility model has the beneficial effects that: can be according to fixing subaerial connection base with welding jig fixed subaerial, improve the stability of anchor clamps itself. Meanwhile, different welding clamps can be replaced by changing the connecting base, so that the applicability is improved, the input cost of a welding robot is reduced, and the occupied space of a factory is reduced;

the welding fixture is provided with a plurality of clamping mechanisms, so that sheet metal parts in different shapes and positions can be clamped independently, and the clamping stability is improved; whether the detection sensor that sets up simultaneously detects has the sheet metal component, simultaneously, still is equipped with the location structure that advances line location to the sheet metal component, is convenient for advance line location to the sheet metal component before pressing from both sides tight sheet metal component, avoids the sheet metal component skew.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a perspective view of the present invention in its entirety;

FIG. 2 is a perspective view of the end clamp of the present invention;

FIG. 3 is a perspective view of a first clamping mechanism of the present invention;

FIG. 4 is a perspective view of FIG. 3 with the main beam removed;

FIG. 5 is a top view of FIG. 3;

FIG. 6 is a perspective view of a second clamping mechanism of the present invention;

FIG. 7 is a perspective view of a second clamping mechanism of the present invention;

FIG. 8 is a left side view of FIG. 7;

fig. 9 is a perspective view of a third positioning detection mechanism of the present invention;

FIG. 10 is a perspective view of a fourth clamping mechanism of the present invention;

FIG. 11 is a perspective view of a fourth clamping mechanism of the present invention;

FIG. 12 is a perspective view of a fifth clamping mechanism of the present invention;

FIG. 13 is a perspective view of a fifth clamping mechanism of the present invention;

FIG. 14 is a perspective view of a fifth clamping mechanism of the present invention;

FIG. 15 is a perspective view of a fifth clamping mechanism of the present invention;

fig. 16 is a perspective view of a fifth clamping mechanism of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention and are not to be construed as limiting the present invention.

As shown in fig. 1 to 16, a quick-change welding fixture for rear longitudinal beam multi-sheet metal parts comprises a welding fixture and a connecting base 9 fixed on the ground, wherein first positioning plates 9a extending left and right are respectively arranged on the top surface of the connecting base 9 near the front and the rear sides, positioning columns 9b are respectively arranged on the first positioning plates 9a, second positioning plates 8b extending left and right and corresponding to the first positioning plates 9a are arranged on the bottom side of the welding fixture, positioning holes for the positioning columns 9b to pass through are arranged on the second positioning plates 8b, vertically coincident mounting through holes are further arranged on the first positioning plates 9a and the second positioning plates 8b, and the first positioning plates 9a and the second positioning plates 8b are locked together by combining bolts and nuts through the mounting through holes, so that the welding fixture is fixed on the connecting base 9;

the welding fixture comprises a clamping platform 8, telescopic supporting legs 8c which are positioned at the front side and the rear side of a connecting base 9 are arranged at the bottom of the clamping platform, and moving wheels 8a which are positioned at the outer sides of the telescopic supporting legs 8c are arranged at the bottom of the clamping platform; the clamping platform is provided with two end clamps 7, a plurality of clamping mechanisms are sequentially arranged between the two end clamps 7 from front to back, one sides of the two end clamps 7 opposite to each other are provided with main beam positioning mechanisms for positioning a groove-shaped main beam, the two main beam positioning mechanisms are located right below the main beam, each of the two positioning mechanisms comprises an end positioning cylinder A with an upward extending end, the extending end of each end positioning cylinder A is connected with a main beam positioning pin B, and each end positioning pin B extends into a positioning hole in the bottom of the main beam to perform positioning;

the end clamps 7 respectively comprise a mounting base 7a and an end clamping cylinder 7b fixed on the mounting base 7 a; an end pressing arm 7c extending left and right is hinged on the mounting base 7a of the end clamp 7; an end clamping cylinder 7b is fixed on the left side of an installation base 7a, an end pressing arm 7c is hinged on the installation base 7a, the right end of the end pressing arm 7c is hinged with the extending end of the end clamping cylinder 7b, the end pressing arm 7c is driven to press downwards by the end clamping cylinder 7b, a clamping gap 7d matched with a groove-shaped main beam is concavely arranged at the top of the installation base 7a downwards, two L-shaped clamping support columns 7e respectively positioned at the two sides of the clamping gap 7d are arranged at the left and the right of the top of the installation base 7a at intervals, transverse rods of the two L-shaped clamping support columns 7e are arranged far away from each other, vertical rods of the two L-shaped clamping support columns 7e are close to each other, notch skirts at the left and the right sides of the main beam are respectively placed at the top ends of the two L-shaped clamping support columns 7e, a lower pressing block 7f is arranged at the bottom of the end pressing arm 7c corresponding to the two clamping support columns 7e, the notch skirt of the main beam is clamped by the clamping support columns 7e and the lower pressing blocks 7f, and main beam lateral supporting blocks 7g used for supporting the left side wall and the right side wall of the main beam are arranged on the front side and the rear side of the vertical rods of the two L-shaped clamping support columns 7 e.

Preferably, the number of the clamping mechanisms is six, and the first clamping mechanism 1, the second clamping mechanism 2, the third positioning detection mechanism 3, the fourth clamping mechanism 4, the fifth clamping mechanism 5 and the sixth clamping mechanism 6 are arranged in sequence from front to back, the first clamping mechanism 1 comprises a first left base 1a and a first right base 1b which are respectively positioned at the left side and the right side of the main beam, the first left base 1a is located on the front side of the first right base 1b, a first clamping cylinder 1c with an upward extending end is arranged on the left side of the first left base 1a, a first pressure arm 1d extending left and right is hinged to the top of the first left base 1a, the left end of the first pressure arm 1d is hinged to the extending end of the first clamping cylinder 1c, the right end of the first pressure arm 1d extends to the upper side of the main beam, a first pressure claw 1e extending into the main beam is arranged on the rear side of the first pressure arm 1d, and the bottom of the first sheet metal part is pressed in a main beam groove through the first pressure claw 1 e;

the front side of the first right base 1b is provided with a first positioning cylinder 1f with an upward extending end, the extending end of the first positioning cylinder 1f is provided with a first supporting claw 1g positioned right below the first pressing claw 1e, claw teeth of the first supporting claw 1g and claw teeth of the first pressing claw 1e are arranged in a vertically corresponding mode, the extending end of the first positioning cylinder 1f is further provided with a first vertical positioning pin 1i positioned on the left side of the first supporting claw, and the first vertical positioning pin 1i sequentially penetrates through a main beam positioning hole and a first sheet metal part positioning hole;

two first skirt edge pressure bars 1k extending backwards are arranged on the first pressure arm 1d at left and right intervals, and the skirt edges of the notches at the two sides of the main beam are compressed through the two first skirt edge pressure bars; the first left base 1a is provided with a first skirt edge abutting rod 1j extending backwards and located below a first skirt edge pressing rod 1k, notch skirt edges on two sides of the main beam are clamped between the tail end of the first skirt edge abutting rod 1j and the tail end of the first skirt edge pressing rod 1k, the top of the first right base 1b is provided with a first skirt edge abutting block 1l vertically corresponding to the tail end of the first skirt edge pressing rod 1k on the right side, the first skirt edge abutting rod 1j and the first right base 1b are relatively provided with a first lateral abutting block 1m, and the first lateral abutting block 1m abuts against the left side surface and the right side surface of the main beam;

a main beam detection sensor 1n extending into the main beam is arranged on the first skirt pressure lever 1 k; be equipped with the first panel beating detection sensor 1o that is located the girder on the first pressure arm 1d, the sense terminal of first panel beating detection sensor 1o sets up towards the back, detects through the preceding lateral wall contact of first panel beating detection sensor 1o and first panel beating mutually.

Preferably, the second clamping mechanism 2 comprises a second left base 2a and a second right base 2b which are respectively positioned at the left side and the right side of the main beam, a second clamping cylinder 2c with an upward extending end is arranged at the left side of the second left base 2a, a second pressure arm 2d extending left and right is hinged at the top of the second left base 2a, the left end of the second pressure arm 2d is hinged with the extending end of the second clamping cylinder 2c, the right end of the second pressure arm 2d extends to the upper side of the main beam, a second pressing cylinder 2e is arranged on the second pressure arm 2d, the second pressing cylinder 2e is positioned in the groove of the main beam when the second pressure arm 2d is transversely arranged, the extending end of the second pressing cylinder 2e is downwards arranged and provided with a second pressing claw 2f, the claw teeth of the second pressing claw 2f are respectively positioned at the front side and the back side of the second pressing cylinder 2e, the second sheet metal parts and the third sheet metal parts which are positioned at the front side and the rear side of the second pressing cylinder 2e are pressed in the main beam groove through the claw teeth of the second pressing claw 2 f; a second clamping positioning pin 2k inserted into the main beam positioning hole is arranged at the front side of the second pressing claw 2 f;

a second positioning cylinder 2i with an upward extending end is arranged on the second right base 2b, a second supporting claw 2g positioned under the second pressing claw 2f is arranged at the extending end of the second positioning cylinder 2i, claw teeth of the second supporting claw 2g are mutually abutted with claw teeth of the second pressing claw 2f, a second sheet metal positioning pin 2h sequentially penetrating through a main beam positioning hole and a second sheet metal part positioning hole is further arranged on the claw teeth on the front side of the second supporting claw 2g, the top end of the second sheet metal positioning pin 2h is abutted with the bottom end of the claw teeth of the second pressing claw 2f, a third sheet metal positioning pin 2j sequentially penetrating through the main beam positioning hole and a third sheet metal part positioning hole is further arranged on the claw teeth on the rear side of the second supporting claw 2g, and the top end of the third sheet metal positioning pin 2j is abutted with the bottom end of the claw teeth of the second pressing claw 2 f;

the second pressing claw 2f is also provided with a second sheet metal detection sensor 2l used for abutting against the rear side of the second sheet metal part and a third sheet metal detection sensor 2p used for abutting against the bottom of a third sheet metal part, and a second left base 2a and a second right base 2b are oppositely provided with a second lateral abutting block 2m which abuts against the left side surface and the right side surface of the main beam through the second lateral abutting block 2 m; the second pressing claw 2f is further provided with a second skirt pressing block 2n located on the rear side of the second pressing cylinder 2e, a second skirt abutting block 2l vertically corresponding to the second skirt pressing block 2n is arranged on the second right base 2b, the notch skirt on the right side of the main beam is clamped by the second skirt pressing block 2n and the second skirt abutting block 2l, a second skirt pressing rod 2o extending backwards is arranged on the second pressing arm 2d, a second skirt abutting block 2l is also arranged on the second left base 2a, and the second skirt abutting block 2l vertically corresponds to the tail end of the second skirt pressing rod 2 o.

Preferably, the third positioning detection mechanism 3 includes a third base 3a located on the left side of the main beam, a third positioning cylinder 3b with an extending end arranged towards the left is arranged on the third base 3a, the extending end of the third positioning cylinder 3b is hinged with a third pressing arm 3c extending vertically, the middle part of the third pressing arm 3c is hinged on the left side of the third base 3a through a pin shaft 3f, a lateral abutting cylinder 3d with an extending end arranged towards the left is arranged on the third pressing arm 3c, and a left side detection sensor 3e for detecting the left side wall of the main beam is arranged at the extending end of the lateral abutting cylinder 3 d.

Preferably, the fourth clamping mechanism 4 comprises a fourth base 4a located below the main beam, a fourth clamping cylinder 4c with an upward extending end is arranged on the left side of the fourth base 4a, a fourth pressing arm 4b extending left and right is hinged to the top of the fourth base 4a, the left end of the fourth pressing arm 4b is hinged to the extending end of the fourth clamping cylinder 4c, the right end of the fourth pressing arm 4b extends to the upper side of the main beam, two in-groove pressing rods 4e extending into the main beam groove are arranged on the left and right of the bottom of the fourth pressing arm 4b at intervals, a fourth groove bottom abutting block 4f corresponding to the two in-groove pressing rods 4e in the vertical direction is arranged on the upper side of the fourth base 4a, and the groove bottom of the main beam is pressed and fixed between the in-groove pressing rod 4e and the fourth groove bottom abutting block 4 f;

a fourth skirt pressing block 4g is arranged at the right end of the fourth pressing arm 4b, and a fourth skirt abutting block 4h vertically corresponding to the fourth skirt pressing block 4g is arranged at the right side of the fourth base 4 a; a fourth main beam detection sensor 4i is connected to the groove bottom pressure lever 4e close to the left side.

Preferably, the fifth clamping mechanism 5 comprises a fifth base 5a, a fifth clamping cylinder 5c with an upward extending end is arranged on the left side of the fifth base 5a, a fifth pressing arm 5b extending left and right is hinged on the top of the fifth base 5a, the left end of the fifth pressing arm 5b is hinged with the extending end of the fifth clamping cylinder 5c, the right end of the fifth pressing arm 5b extends to the upper side of the main beam, a fifth pressing cylinder 5f with a downward extending end is arranged on the fifth pressing arm 5b, a fifth pressing claw 5g is arranged on the extending end of the fifth pressing cylinder 5f, the fifth pressing claw 5g comprises a plurality of in-groove claw teeth 5e extending into the groove of the main beam, the right end of the fifth base 5a extends to the right side of the main beam from the lower side of the main beam, a fifth groove bottom supporting block 5i positioned right below the fifth pressing claw 5g is arranged on the fifth base 5a, the main beam and the chassis are positioned between the supporting block and the fifth pressing claw, clamping a main beam and a chassis positioned below the main beam through a fifth groove bottom abutting block 5i and a fifth pressing claw 5g, wherein the right side of the chassis extends to the right side of the main beam, a fourth sheet metal part is arranged on the chassis, an outer sheet metal pressing cylinder 5j with an upward extending end is arranged at the right end of a fifth base 5a, an outer sheet metal pressing block 5k is arranged at the extending end of the outer sheet metal pressing cylinder 5j, an outer sheet metal abutting block 5l vertically corresponding to the outer sheet metal pressing block 5k is arranged on the fifth base 5a, the chassis is clamped between the outer sheet metal pressing block 5k and the outer sheet metal abutting block 5l, and a fourth sheet metal part placed on the chassis and the chassis are pressed together through the outer sheet metal pressing block 5k and the outer sheet metal abutting block 5 l; a chassis detection sensor 5o for detecting a chassis is arranged on the front side of the outer metal plate abutting block 5 l;

an outer metal plate positioning mechanism used for positioning the chassis and the fourth metal plate part is further arranged on the fifth base 5a, the outer metal plate positioning mechanism comprises an outer metal plate positioning cylinder 5m with an upward extending end, the extending end of the outer metal plate positioning cylinder 5m is provided with a plurality of outer metal plate positioning pins 5n arranged at intervals in the front-back direction, and the outer metal plate positioning pins 5n sequentially penetrate through the chassis and positioning holes overlapped with the fourth metal plate part;

the top of the fifth pressing claw 5g is further provided with a fifth skirt pressing block 5h extending to the notch skirt at the right side of the main beam, and the notch skirt at the right side of the main beam is pressed at the top of the fourth sheet metal part through the fifth skirt pressing block 5 h.

Preferably, the sixth clamping mechanism 6 comprises a sixth base 6a, a sixth clamping cylinder 6c with an upward extending end is arranged on the left side of the sixth base 6a, a sixth pressure arm 6b extending left and right is hinged to the top of the sixth base 6a, the left end of the sixth pressure arm 6b is hinged to the extending end of the sixth clamping cylinder 6c, the right end of the sixth pressure arm 6b extends to the position right above the girder, and a sixth pressure rod 6e extending into the groove of the girder is arranged on the sixth pressure arm 6 b; the right end of the sixth base 6a extends to the right side of the main beam from the lower part of the main beam, a sixth groove bottom abutting block 6m which vertically corresponds to the sixth pressure rod 6e is arranged on the sixth base 6a, and the groove bottom of the main beam is clamped and fixed between the sixth pressure rod 6e and the sixth groove bottom abutting block 6 m;

a sixth positioning cylinder 6f positioned right below the main beam is arranged on the front side of the sixth base 6a, the extending end of the sixth positioning cylinder 6f is arranged upwards, and a positioning bolt 6g inserted into a positioning hole at the bottom of the main beam is fixed at the extending end of the sixth positioning cylinder;

the rear side of sixth base 6a is equipped with and is located the left side direction panel beating of girder and compresses tightly cylinder 6h, the side direction panel beating compresses tightly the end that stretches out of cylinder 6h and sets up towards the right side, and the side direction panel beating compresses tightly the end that stretches out of cylinder 6h and is equipped with and is located the left side direction depression bar 6i of girder, the right side of side direction depression bar 6i is equipped with the draw-in groove 6j that supplies to be located the left fifth sheet metal component left side card income of girder, the tank bottom of draw-in groove 6j is equipped with the fixed bolt 6k that extends right, insert the locating hole that extends about the fifth sheet metal component through fixed bolt 6k, the right side of side direction depression bar 6i is equipped with and is located fifth sheet metal detection sensor 6l under the fifth sheet metal component.

Preferably, a first auxiliary pressing cylinder 4j with an extending end facing to the right is arranged on a fourth base 4a of the fourth clamping mechanism 4, and a first auxiliary pressing block 4k used for pressing the front end of the left side wall of the fourth sheet metal part on the right side wall of the main beam is arranged at the extending end of the first auxiliary pressing cylinder 4 j;

a second auxiliary pressing cylinder 6o with an extending end arranged towards the right is arranged on a sixth base 6a of the sixth clamping mechanism 6, and a second auxiliary pressing block 6n for pressing the rear end of the left side wall of the fourth sheet metal part on the right side wall of the main beam is arranged on the second auxiliary pressing cylinder 6 o;

a main beam positioning mechanism arranged close to the front side is fixed on the front side of the first base 1 a; the main beam positioning mechanism arranged close to the front side is fixed at the front side of the mounting base of the end clamp 7 arranged close to the rear side;

the left side of the connecting base 6 is provided with a step-up step 10.

While embodiments of the utility model have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. The utility model provides a many sheet metal components of back longeron quick change welding frock which characterized in that: the welding fixture comprises a welding fixture and a connecting base (9) fixed on the ground, wherein the top surface of the connecting base (9) is provided with first positioning plates (9a) extending left and right near the front side and the rear side respectively, the first positioning plates (9a) are provided with positioning columns (9b), the bottom side of the welding fixture is provided with second positioning plates (8b) extending left and right and corresponding to the first positioning plates (9a), the second positioning plates (8b) are provided with positioning holes for the positioning columns (9b) to pass through, the first positioning plates (9a) and the second positioning plates (8b) are further provided with mounting through holes coinciding up and down, and the first positioning plates (9a) and the second positioning plates (8b) are locked together through the mounting through holes and bolts and nuts so as to fix the welding fixture on the connecting base (9);

the welding fixture comprises a clamping platform (8), telescopic supporting legs (8c) which are positioned at the front side and the rear side of a connecting base (9) are arranged at the bottom of the clamping platform, and moving wheels (8a) which are positioned at the outer sides of the telescopic supporting legs (8c) are arranged at the bottom of the clamping platform; the clamping platform is provided with two end clamps (7), a plurality of clamping mechanisms are sequentially arranged between the two end clamps (7) from front to back, main beam positioning mechanisms for positioning a groove-shaped main beam are arranged on opposite sides of the two end clamps (7), the two main beam positioning mechanisms are located right below the main beam, each positioning mechanism comprises an end positioning cylinder (A) with an upward extending end, the extending end of each end positioning cylinder (A) is connected with a main beam positioning pin (B), and each main beam positioning pin (B) extends into a positioning hole in the bottom of the main beam groove to perform positioning;

the end clamps (7) respectively comprise a mounting base (7a) and end clamping cylinders (7b) fixed on the mounting base (7 a); an end pressing arm (7c) extending left and right is hinged to the mounting base (7a) of the end clamp (7); the end part clamping cylinder (7b) is fixed on the left side of the mounting base (7a), the end part pressing arm (7c) is hinged to the mounting base (7a), the right end of the end part pressing arm (7c) is hinged to the extending end of the end part clamping cylinder (7b), the end part pressing arm (7c) is driven to press downwards through the end part clamping cylinder (7b), a clamping notch (7d) matched with the groove-shaped main beam is downwards and concavely arranged at the top of the mounting base (7a), two L-shaped clamping support columns (7e) respectively positioned at two sides of the clamping notch (7d) are arranged at the left and right sides of the top of the mounting base (7a) at intervals, the two L-shaped clamping support columns (7e) are arranged in a back-to-back manner, the notch skirts at the left and right sides of the main beam are respectively placed at the top ends of the two L-shaped clamping support columns (7e), and a lower pressing block (7f) is arranged at the bottom of the end part pressing arm (7c) corresponding to the two clamping support columns (7e), the notch skirt of the main beam is clamped by the clamping support columns (7e) and the lower pressing block (7f), and main beam lateral abutting blocks (7g) used for abutting against the left side wall and the right side wall of the main beam are arranged on the opposite sides of the vertical rods of the two L-shaped clamping support columns (7 e).

2. The quick-change welding tool for the multiple sheet metal parts of the rear longitudinal beam as claimed in claim 1, characterized in that: the clamping mechanisms are six and sequentially comprise a first clamping mechanism (1), a second clamping mechanism (2), a third positioning detection mechanism (3), a fourth clamping mechanism (4), a fifth clamping mechanism (5) and a sixth clamping mechanism (6) from front to back, the first clamping mechanism (1) comprises a first left base (1a) and a first right base (1b) which are respectively positioned at the left side and the right side of the girder, the first left base (1a) is positioned at the front side of the first right base (1b), a first clamping cylinder (1c) with an upward extending end is arranged at the left side of the first left base (1a), a first pressure arm (1d) extending leftwards and rightwards is hinged to the top of the first left base (1a), the left end of the first pressure arm (1d) is hinged to the extending end of the first clamping cylinder (1c), and the right end of the first pressure arm (1d) extends to the upper part of the girder, a first pressing claw (1e) extending into the main beam is arranged at the rear side of the first pressing arm (1d), and the bottom of the first sheet metal part is pressed in the main beam groove through the first pressing claw (1 e);

a first positioning cylinder (1f) with an upward extending end is arranged on the front side of the first right base (1b), a first supporting claw (1g) located right below the first pressing claw (1e) is arranged on the extending end of the first positioning cylinder (1f), claw teeth of the first supporting claw (1g) and claw teeth of the first pressing claw (1e) are arranged in a vertically corresponding mode, a first vertical positioning pin (1i) located on the left side of the first supporting claw is further arranged on the extending end of the first positioning cylinder (1f), and the first vertical positioning pin (1i) sequentially penetrates through a main beam positioning hole and a first sheet metal part positioning hole;

two first skirt edge pressure rods (1k) extending backwards are arranged on the first pressure arm (1d) at left and right intervals, and the skirt edges of notches on the two sides of the main beam are compressed through the two first skirt edge pressure rods; the first left base (1a) is provided with a first skirt edge abutting rod (1j) which extends backwards and is located below a first skirt edge pressing rod (1k), notch skirt edges on two sides of the main beam are clamped between the tail end of the first skirt edge abutting rod (1j) and the tail end of the first skirt edge pressing rod (1k), the top of the first right base (1b) is provided with a first skirt edge abutting block (1l) which vertically corresponds to the tail end of the first skirt edge pressing rod (1k) on the right side, the first skirt edge abutting rod (1j) and the first right base (1b) are relatively provided with a first lateral abutting block (1m), and the first lateral abutting block (1m) abuts against the left side surface and the right side surface of the main beam;

a main beam detection sensor (1n) extending into the main beam is arranged on the first skirt edge pressure rod (1 k); and a first metal plate detection sensor (1o) positioned in the main beam is arranged on the first pressure arm (1 d).

3. The quick-change welding tool for the multiple sheet metal parts of the rear longitudinal beam as claimed in claim 2, characterized in that: the second clamping mechanism (2) comprises a second left base (2a) and a second right base (2b) which are respectively positioned at the left side and the right side of the main beam, a second clamping cylinder (2c) with an upward extending end is arranged at the left side of the second left base (2a), a second pressure arm (2d) extending leftwards and rightwards is hinged at the top of the second left base (2a), the left end of the second pressure arm (2d) is hinged with the extending end of the second clamping cylinder (2c), the right end of the second pressure arm (2d) extends to the upper side of the main beam, a second pressure cylinder (2e) is arranged on the second pressure arm (2d), the second pressure cylinder (2e) is positioned in a groove of the main beam when the second pressure arm (2d) is transversely arranged, the extending end of the second pressure cylinder (2e) is downwards arranged and is provided with a second pressure claw (2f), and claw teeth of the second pressure claw (2f) are respectively positioned at the front side and the back side of the second pressure cylinder (2e), second sheet metal parts and third sheet metal parts which are positioned at the front side and the rear side of the second pressing cylinder (2e) are pressed in the main beam groove through claw teeth of the second pressing claw (2 f); a second clamping positioning pin (2k) inserted into a positioning hole in the main beam is arranged on the front side of the second pressing claw (2 f);

a second positioning cylinder (2i) with an upward extending end is arranged on the second right base (2b), the extending end of the second positioning cylinder (2i) is provided with a second resisting claw (2g) which is positioned right below the second pressing claw (2f), the claw teeth of the second resisting claw (2g) and the claw teeth of the second pressing claw (2f) are mutually propped, a second sheet metal positioning pin (2h) which sequentially penetrates through the main beam positioning hole and the second sheet metal part positioning hole is also arranged on the claw tooth at the front side of the second abutting claw (2g), the top end of the second sheet metal positioning pin (2h) is propped against the bottom ends of the claw teeth of the second pressing claw (2f), a third sheet metal positioning pin (2j) which sequentially penetrates through the main beam positioning hole and the third sheet metal part positioning hole is further arranged on the claw teeth at the rear side of the second supporting claw (2g), the top end of the third metal plate positioning pin (2j) is abutted against the bottom ends of the claw teeth of the second pressing claw (2 f);

the second pressing claw (2f) is also provided with a second sheet metal detection sensor (2l) used for abutting against the rear side of the second sheet metal part and a third sheet metal detection sensor (2p) used for abutting against the bottom of a third sheet metal part, the second left base (2a) and the second right base (2b) are relatively provided with a second lateral abutting block (2m) which abuts against the left side surface and the right side surface of the main beam through the second lateral abutting block (2 m); the second pressing claw (2f) is further provided with a second skirt pressing block (2n) located on the rear side of the second pressing cylinder (2e), a second skirt abutting block vertically corresponding to the second skirt pressing block (2n) is arranged on the second right base (2b), the second skirt pressing block (2n) abuts against a notch skirt on the right side of the main beam in a clamping mode through the second skirt, a second skirt pressing rod (2o) extending backwards is arranged on the second pressing arm (2d), a second skirt abutting block is also arranged on the second left base (2a), and the second skirt abutting block vertically corresponds to the tail end of the second skirt pressing rod (2 o).

4. The quick-change welding tool for the multiple sheet metal parts of the rear longitudinal beam as claimed in claim 2, characterized in that: third location detection mechanism (3) is including being located left third base (3a) of girder, be equipped with on third base (3a) and stretch out end third location cylinder (3b) that sets up towards the left side, the end that stretches out of third location cylinder (3b) articulates there is vertical extension third pressure arm (3c), the middle part of third pressure arm (3c) articulates the left side at third base (3a) through round pin axle (3f), it supports tight cylinder (3d) to be equipped with the side direction that stretches out the end and set up towards the left side on third pressure arm (3c), the side direction supports that stretches out of tight cylinder (3d) and is equipped with left side detection sensor (3e) that are used for detecting the left side wall of girder.

5. The quick-change welding tool for the multiple sheet metal parts of the rear longitudinal beam as claimed in claim 2, characterized in that: the fourth clamping mechanism (4) comprises a fourth base (4a) located below the main beam, a fourth clamping cylinder (4c) with an upward extending end is arranged on the left side of the fourth base (4a), a fourth pressing arm (4b) extending leftwards and rightwards is hinged to the top of the fourth base (4a), the left end of the fourth pressing arm (4b) is hinged to the extending end of the fourth clamping cylinder (4c), the right end of the fourth pressing arm (4b) extends to the upper side of the main beam, two in-groove pressing rods (4e) extending into grooves of the main beam are arranged on the bottom of the fourth pressing arm (4b) at the left and right sides at intervals, a fourth groove bottom abutting block (4f) vertically corresponding to the two in-groove pressing rods (4e) is arranged on the upper side of the fourth base (4a), and the groove bottom of the main beam is tightly pressed and fixed between the in-groove pressing rods (4e) and the fourth groove bottom abutting block (4 f);

a fourth skirt pressing block (4g) is arranged at the right end of the fourth pressing arm (4b), and a fourth skirt abutting block (4h) vertically corresponding to the fourth skirt pressing block (4g) is arranged at the right side of the fourth base (4 a); a fourth main beam detection sensor (4i) is connected to the groove inner pressure rod (4e) close to the left side.

6. The quick-change welding tool for the multiple sheet metal parts of the rear longitudinal beam as claimed in claim 5, characterized in that: the fifth clamping mechanism (5) comprises a fifth base (5a), a fifth clamping cylinder (5c) with an upward extending end is arranged on the left side of the fifth base (5a), a fifth pressing arm (5b) extending left and right is hinged to the top of the fifth base (5a), the left end of the fifth pressing arm (5b) is hinged to the extending end of the fifth clamping cylinder (5c), the right end of the fifth pressing arm (5b) extends to the upper side of the main beam, a fifth pressing cylinder (5f) with a downward extending end is arranged on the fifth pressing arm (5b), a fifth pressing claw (5g) is arranged at the extending end of the fifth pressing cylinder (5f), the fifth pressing claw (5g) comprises a plurality of in-groove claw teeth (5e) extending into the groove of the main beam, the right end of the fifth base (5a) extends to the right side of the main beam from the lower side of the main beam, and a fifth pressing block (5i) bottom (5i) located right below the fifth pressing claw (5g) is arranged on the fifth base (5a), clamping a main beam and a chassis positioned below the main beam through a fifth groove bottom abutting block (5i) and a fifth pressing claw (5g), wherein the right side of the chassis extends to the right side of the main beam, a fourth sheet metal part is arranged on the chassis, an outer sheet metal pressing cylinder (5j) with an upward extending end is arranged at the right end of a fifth base (5a), an outer sheet metal pressing block (5k) is arranged at the extending end of the outer sheet metal pressing cylinder (5j), an outer sheet metal abutting block (5l) vertically corresponding to the outer sheet metal pressing block (5k) is arranged on the fifth base (5a), the chassis is clamped between the outer sheet metal pressing block (5k) and the outer sheet metal abutting block (5l), and the fourth sheet metal part placed on the chassis is pressed with the chassis through the outer sheet metal pressing block (5k) and the outer sheet metal abutting block (5 l); a chassis detection sensor (5o) for detecting a chassis is arranged on the front side of the outer metal plate abutting block (5 l);

an outer metal plate positioning mechanism used for positioning the chassis and the fourth metal plate part is further arranged on the fifth base (5a), the outer metal plate positioning mechanism comprises an outer metal plate positioning cylinder (5m) with an upward extending end, the extending end of the outer metal plate positioning cylinder (5m) is provided with a plurality of outer metal plate positioning pins (5n) which are arranged at intervals in the front-back direction, and the outer metal plate positioning pins (5n) sequentially penetrate through the chassis and positioning holes which are overlapped with the fourth metal plate part;

the top of the fifth pressing claw (5g) is also provided with a fifth skirt pressing block (5h) extending to the notch skirt edge on the right side of the main beam, and the notch skirt edge on the right side of the main beam is pressed on the top of the fourth sheet metal part through the fifth skirt pressing block (5 h).

7. The quick-change welding tool for the multiple sheet metal parts of the rear longitudinal beam as claimed in claim 6, characterized in that: the sixth clamping mechanism (6) comprises a sixth base (6a), a sixth clamping cylinder (6c) with an upward extending end is arranged on the left side of the sixth base (6a), a sixth pressure arm (6b) extending left and right is hinged to the top of the sixth base (6a), the left end of the sixth pressure arm (6b) is hinged to the extending end of the sixth clamping cylinder (6c), the right end of the sixth pressure arm (6b) extends to the position right above the main beam, and a sixth pressure rod (6e) extending into the groove of the main beam is arranged on the sixth pressure arm (6 b); the right end of the sixth base (6a) extends to the right side of the main beam from the lower part of the main beam, a sixth groove bottom abutting block (6m) vertically corresponding to the sixth pressure rod (6e) is arranged on the sixth base (6a), and the groove bottom of the main beam is clamped and fixed between the sixth pressure rod (6e) and the sixth groove bottom abutting block (6 m);

a sixth positioning cylinder (6f) positioned right below the main beam is arranged on the front side of the sixth base (6a), the extending end of the sixth positioning cylinder (6f) is arranged upwards, and a positioning bolt (6g) inserted into a positioning hole in the bottom of the main beam groove is fixed at the extending end of the sixth positioning cylinder;

the rear side of sixth base (6a) is equipped with and is located the left side direction panel beating of girder and compresses tightly cylinder (6h), the side direction panel beating compresses tightly the end that stretches out of cylinder (6h) and sets up towards the right side, and the side direction panel beating compresses tightly the end that stretches out of cylinder (6h) and is equipped with and is located the left side direction depression bar (6i) of girder, the right side of side direction depression bar (6i) is equipped with and supplies to be located draw-in groove (6j) that the left side of the left fifth sheet metal component card of girder is gone into, the tank bottom of draw-in groove (6j) is equipped with fixing bolt (6k) that extend right, inserts in the locating hole that the fifth sheet metal component left and right extends through fixing bolt (6k), the right side of side direction depression bar (6i) is equipped with fifth panel beating detection sensor (6l) that are located under the fifth sheet metal component.

8. The quick-change welding tool for the multiple sheet metal parts of the rear longitudinal beam as claimed in claim 7, characterized in that: and a first auxiliary pressing cylinder (4j) with an extending end arranged towards the right is arranged on a fourth base (4a) of the fourth clamping mechanism (4), and the extending end of the first auxiliary pressing cylinder (4j) is provided with a first auxiliary pressing block (4k) for pressing the front end of the left side wall of the fourth sheet metal part onto the right side wall of the main beam.

9. The multi-sheet-metal-part quick-change welding tool for the rear longitudinal beam according to claim 7, characterized in that: and a second auxiliary pressing cylinder (6o) with a stretching end arranged towards the right is arranged on a sixth base (6a) of the sixth clamping mechanism (6), and a second auxiliary pressing block (6n) used for pressing the rear end of the left side wall of the fourth sheet metal part on the right side wall of the main beam is arranged on the second auxiliary pressing cylinder (6 o).

10. The quick-change welding tool for the multiple sheet metal parts of the rear longitudinal beam as claimed in claim 7, characterized in that: the main beam positioning mechanism arranged close to the front side is fixed on the front side of the first left base (1 a); the main beam positioning mechanism arranged close to the front side is fixed at the front side of the mounting base of the end clamp (7) arranged close to the rear side; and a heightening step (10) is arranged on the left side of the connecting base (9).