CN211804585U

CN211804585U - Automobile storage battery underframe welding fixture

Info

Publication number: CN211804585U
Application number: CN202020217734.6U
Authority: CN
Inventors: 杨春带; 林澎; 张玉兰; 胡道江; 黄诗宏; 陆莉玲
Original assignee: Luzhai Weian Automobile Parts Co ltd; Lushan College of Guangxi University of Science and Technology
Current assignee: Luzhai Weian Automobile Parts Co ltd; Lushan College of Guangxi University of Science and Technology
Priority date: 2020-02-27
Filing date: 2020-02-27
Publication date: 2020-10-30
Anticipated expiration: 2030-02-27

Abstract

The utility model aims at providing an automobile storage battery underframe welding fixture, which comprises a workbench, a clamping device I, a clamping device II, a clamping device III, a clamping device IV and a clamping device V; the plurality of clamping devices I are distributed on the rear side of the middle part of the workbench along the left-right direction; the clamping device II is arranged on the front side of the middle part of the workbench; two clamping devices III are arranged and are respectively arranged on the left side and the right side of the clamping device II; two clamping devices IV are arranged and are respectively arranged on two sides of the clamping device III; two clamping devices V are arranged and are respectively arranged at the left end and the right end of the workbench; the clamping device II comprises a clamping block I, a clamping block II, a clamping block III, a clamping block IV and a limiting mechanism I; the clamping block I and the clamping block II are arranged at the lower part of the clamping device II; the clamping block III and the clamping block IV are arranged in the middle of the clamping device II; and the limiting mechanism I is arranged in the middle of the clamping device II. The clamp overcomes the defects of the prior art and has the characteristics of reasonable structure and high clamping and positioning precision.

Description

Automobile storage battery underframe welding fixture

Technical Field

The utility model relates to an automobile parts processing equipment field, concretely relates to car battery chassis welding jig.

Background

The existing storage battery underframe is usually a semi-closed cuboid frame, and can be combined and welded into a whole by an L-shaped underframe splicing piece and a sheet underframe splicing piece; therefore, certain precision requirements are required for clamping and positioning, and the conventional welding clamp is lack of a necessary and reasonable positioning device, so that the clamping error is large, and the welding quality is reduced; meanwhile, the clamping mechanism is excessively complex in part structure and inconvenient to operate, and clamping and welding efficiency is difficult to improve.

Disclosure of Invention

The utility model aims at providing an automobile storage battery chassis welding jig, this anchor clamps overcome prior art defect, have rational in infrastructure, characteristics that centre gripping positioning accuracy is high.

The technical scheme of the utility model as follows:

a welding fixture for an automobile storage battery underframe comprises a workbench, a clamping device I, a clamping device II, a clamping device III and a positioning device;

the clamping device I is arranged on the left side of the workbench, the clamping device II is arranged on the rear side of the workbench, the clamping device III is arranged on the right side of the workbench, and the positioning device is arranged on the front side of the workbench;

the clamping device I supports the L-shaped splicing piece of the underframe and clamps the lower part of the L-shaped splicing piece of the underframe from top to bottom; the clamping device II clamps the upper part of the bottom frame sheet splicing piece from front to back, and the clamping device III clamps the upper part of the bottom frame L-shaped splicing piece from left to right;

the positioning device comprises a base I, a cylinder I, a support rod I, a drive rod I, a connecting plate, a limiting mechanism I and a limiting mechanism II;

the base I is arranged on the front side of the workbench, the cylinder body of the cylinder I is fixedly arranged on the side portion of the base I, the piston rod of the cylinder I extends upwards, and the lower end of the support rod I is fixedly connected with the top of the base I; the front end of the driving rod I is hinged with the end part of a piston rod of the air cylinder I, the front side of the middle part of the driving rod I is hinged with the upper end of the supporting rod I, and the driving rod I can rotate in the vertical direction under the driving of the piston rod of the air cylinder I; the two connecting rods I are arranged, one ends of the two connecting rods I are connected with the rear end of the driving rod I, the other ends of the two connecting rods I extend towards two sides respectively, and the two connecting rods I and the driving rod I form a Y-shaped support together; the tail end of the connecting rod I is vertically connected with the inner side of the connecting plate respectively; the two connecting plates are respectively provided with a limiting mechanism I and a limiting mechanism II; when the piston rod of cylinder I drives actuating lever I and moves to the horizontal direction, stop gear I, stop gear II can be fixed to the spacing of chassis L type splice, chassis slice splice.

Preferably, the clamping device I comprises a base II, a cylinder II, a supporting rod II, a driving rod II, a pressing block I and a supporting column I;

the base II is fixedly arranged on the left side of the workbench, the cylinder body of the air cylinder II is fixedly arranged on the side part of the base II, the piston rod of the air cylinder II extends upwards, and the lower end of the support rod II is fixedly connected with the top of the base II; the left end of the driving rod II is hinged with the end part of a piston rod of the air cylinder I, the left side of the middle part of the driving rod II is hinged with the upper end of the supporting rod II, and the driving rod II can be driven by the piston rod of the air cylinder II to rotate in the vertical direction; the pressing block I is arranged at the tail end of the driving rod II and is perpendicular to the driving rod II; the vertical two that are equipped with of support column, respectively fixed mounting in II upper portions right sides of base, the support column run through the mounting hole of chassis L type splice bottom, support chassis L type splice, when the piston rod of cylinder II drove II movements of actuating lever to the horizontal direction, compact heap I from the top compresses tightly chassis L type splice downwards.

Preferably, clamping device I still include support column II, II vertical being equipped with two of support column, fixed mounting is in the front and back both sides in II middle parts of base respectively, support column II and support column I be located same horizontal plane.

Preferably, the clamping device II comprises a driving device, a base III, a cylinder III, a driving rod III, a pressing block II and a pressing block III;

the driving device is fixedly arranged on the rear side of the workbench, the base III is fixedly arranged on the top of the driving device, and the driving device can drive the base II to move back and forth in the horizontal direction; the cylinder body of the air cylinder III is arranged on the rear side of the top of the base, and the piston rod of the air cylinder III extends to the front side along the horizontal direction; the upper part of the rear end of the driving rod III is hinged with the end part of a piston rod of the air cylinder III, the lower part of the driving rod III is hinged with the top of the base III, and the driving rod III can be driven by the piston rod of the air cylinder III to rotate in the vertical direction; the pressing block II is arranged on the front side of the top of the base III, and the pressing block III is arranged at the front end of the driving rod III; when the driving device drives the base III to move forwards to the limit, the front side of the pressing block II is in contact with the upper part of the rear side of the sheet splicing piece of the underframe; when a piston rod of the air cylinder III drives the driving rod III to move to the horizontal direction, the pressing block III is matched with the pressing block II from front to back to press the upper part of the bottom frame sheet splicing piece.

Preferably, the clamping device III comprises a driving device, a base IV, a cylinder IV, a supporting rod III, a driving rod IV, a pressing block IV and a pressing block V;

the driving device is fixedly arranged on the right side of the workbench, the base IV is fixedly arranged on the top of the driving device, and the driving device can drive the base IV to move left and right in the horizontal direction; the cylinder body of the cylinder IV is fixedly arranged on the side part of the base IV, the piston rod of the cylinder IV extends upwards, and the lower end of the support rod III is fixedly connected with the top of the base IV; the right end of the driving rod IV is hinged with the end part of a piston rod of the cylinder IV, the right side of the middle part of the driving rod IV is hinged with the top of the supporting rod III, and the driving rod IV can be driven by the piston rod of the cylinder IV to rotate in the vertical direction; the pressing block IV is arranged at the left end of the top of the base IV, and the pressing block V is arranged at the left end of the driving rod IV; when the driving device drives the base IV to move to the left side to the limit, the left side of the pressing block IV is in contact with the right side of the L-shaped splicing piece of the bottom frame; when a piston rod of the air cylinder IV drives the driving rod IV to move to the horizontal direction, the pressing block V presses the left side of the upper part of the L-shaped splicing piece of the bottom frame from left to right.

Preferably, the driving device comprises a supporting seat, a sliding block, a guide rail, a driving cylinder and a supporting plate; the supporting seat is fixedly arranged at the rear side of the workbench, two guide rails are arranged and are respectively arranged at two sides of the supporting seat in the length direction, the sliding block is arranged on the guide rails and can slide back and forth along the length direction of the guide rails, and the bottom of the supporting plate is connected with the sliding block; the cylinder body of the driving cylinder is fixedly arranged on the supporting seat, the piston rod of the driving cylinder is connected with the side part of the supporting plate, and the piston rod of the driving cylinder can drive the supporting plate to slide back and forth along the length direction of the guide rail; and the clamping device II or the base of the clamping device II is fixedly arranged on the supporting plate.

Preferably, the included angle between two connecting rods I is a right angle.

Preferably, the limiting mechanisms I and II comprise limiting columns, screw rods and screw caps, the screw rods penetrate through holes in the connecting plate and extend outwards, the two screw caps are arranged on two sides of the connecting plate on the screw rods, and the screw rods are fixed or loosened by rotating the screw caps; when the piston rod of cylinder I drove actuating lever I4 and moves to the horizontal direction, the spacing post of stop gear I, stop gear II was just respectively to the mounting hole of chassis L type splice, chassis slice splice, loosens the nut, will control the spacing post of stop gear I, stop gear II and stretch out the mounting hole that the embedding corresponds, and the nut of screwing realizes the spacing fixed of chassis L type splice, chassis slice splice.

The working process of the utility model is as follows:

placing the L-shaped splicing piece of the underframe on a clamp, and supporting through a support column I and a support column II; starting an air cylinder II of the clamping device I, and driving a driving rod II to enable a pressing block I to press the L-shaped splicing piece of the chassis from top to bottom; starting a driving device of the clamping device III to enable the pressing block IV to be in contact with the side part of the L-shaped splicing piece of the underframe; starting an air cylinder IV, and driving a driving rod IV to enable a pressing block V to press the L-shaped splicing piece of the chassis from left to right; starting a cylinder III of the clamping device II, clamping the upper part of the underframe sheet splicing piece through the pressing block II and the clamping block III, and starting a driving device of the clamping device II to push the underframe sheet splicing piece to the rear side of the underframe L-shaped splicing piece to be integrated with the underframe L-shaped splicing piece; open cylinder I and drive I motion of actuating lever to the horizontal direction for stop gear I, stop gear II are respectively just to each lateral part mounting hole of chassis slice splice, chassis L type splice, and the screw rod of stop gear I, stop gear II is loosened to the rotating nut makes the spacing post that corresponds stretch out the mounting hole that the embedding corresponds, then screws the nut, realizes chassis slice splice, the spacing fixed of chassis L type splice.

The utility model discloses a plurality of clamping device realize the diversified spacing of each splice of automobile storage battery chassis and fix, clamping device I realizes the basic support and the fixed of chassis L type splice, and clamping device III then through the integrated configuration of drive arrangement and cylinder IV, realizes the further spacing of chassis L type splice and fixes, guarantees the spacing stability of centre gripping; the clamping device II is driven by the driving device and the air cylinder III to realize the limiting and fixing of the sheet splicing pieces of the underframe, so that the accuracy of clamping matching is improved; the positioning device realizes further limiting and fixing of the L-shaped splicing piece and the sheet splicing piece of the bottom frame by matching the telescopic limiting mechanism I and the telescopic limiting mechanism II through the air cylinder I, improves the accuracy and ensures the welding quality.

Drawings

Fig. 1 is a schematic structural view of an automobile storage battery chassis welding fixture provided by the present invention;

FIG. 2 is a schematic structural view of a clamping device I of the welding fixture for the underframe of the automobile storage battery provided by the utility model;

FIG. 3 is a schematic structural view of a clamping device II of the welding fixture for the underframe of the automobile storage battery provided by the present invention;

fig. 4 is a schematic structural diagram of a clamping device iii of the welding fixture for the underframe of the automobile storage battery provided by the present invention;

FIG. 5 is a schematic structural view of a clamping device IV of the welding jig for the underframe of the automobile storage battery provided by the present invention;

fig. 6 is a schematic structural diagram of a driving device of the welding jig for the underframe of the automobile storage battery provided by the present invention;

FIG. 7 is a schematic structural view of an L-shaped splicing piece and a sheet-shaped splicing piece of the chassis of the welding fixture for the chassis of the automobile storage battery provided by the present invention;

the names and serial numbers of the parts in the figure are as follows:

1 is a workbench, 2 is a clamping device I, 3 is a clamping device II, 4 is a clamping device III, 5 is a positioning device, 6 is an underframe L-shaped splicing piece, 7 is an underframe sheet splicing piece, and 8 is a driving device;

21 is a base II, 22 is a cylinder II, 23 is a support rod II, 24 is a drive rod II, 25 is a pressing block I, 26 is a support column I, and 27 is a support column II;

31 is a base III, 32 is a cylinder III, 33 is a driving rod III, 34 is a pressing block II, and 35 is a pressing block III;

41 is a base IV, 42 is a cylinder IV, 43 is a support rod III, 44 is a driving rod IV, 45 is a pressing block IV, and 46 is a pressing block V;

the device comprises a base I51, a cylinder I52, a support rod I53, a drive rod I54, a connecting rod I55, a connecting plate 56, a limiting mechanism I57 and a limiting mechanism II 58, wherein the base I is a base I;

81 is a supporting seat, 82 is a sliding block, 83 is a guide rail, 84 is a driving cylinder, and 85 is a supporting plate.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and examples.

Example 1

As shown in fig. 1 to 7, the welding jig for the underframe of the automobile storage battery provided by the embodiment comprises a workbench 1, a clamping device i 2, a clamping device ii 3, a clamping device iii 4 and a positioning device 5;

the clamping device I2 is arranged on the left side of the workbench 1, the clamping device II 3 is arranged on the rear side of the workbench 1, the clamping device III 4 is arranged on the right side of the workbench 1, and the positioning device 5 is arranged on the front side of the workbench 1;

the clamping device I2 supports the L-shaped splicing piece 6 of the underframe and clamps the lower part of the L-shaped splicing piece 6 of the underframe from top to bottom; the clamping device II 3 clamps the upper part of the chassis sheet splicing piece 7 from front to back, and the clamping device III 4 clamps the upper part of the chassis L-shaped splicing piece 6 from left to right;

the positioning device 5 comprises a base I51, a cylinder I52, a support rod I53, a drive rod I54, a connecting rod I55, a connecting plate 56, a limiting mechanism I57 and a limiting mechanism II 58;

the base I51 is arranged on the front side of the workbench 1, a cylinder body of the cylinder I52 is fixedly arranged on the side portion of the base I51, a piston rod of the cylinder I52 extends upwards, and the lower end of the support rod I53 is fixedly connected with the top of the base I51; the front end of the driving rod I54 is hinged with the end part of a piston rod of the air cylinder I52, the front side of the middle part of the driving rod I54 is hinged with the upper end of the supporting rod I53, and the driving rod I54 can be driven by the piston rod of the air cylinder I52 to rotate in the vertical direction; two connecting rods I55 are arranged, one ends of the two connecting rods I55 are connected with the rear end of the driving rod I54, the other ends of the two connecting rods I55 extend towards two sides respectively, and the two connecting rods I55 and the driving rod I54 form a Y-shaped support together; the tail ends of the connecting rods I55 are respectively and vertically connected with the inner sides of the connecting plates 56; the two connecting plates 56 are respectively provided with a limiting mechanism I57 and a limiting mechanism II 58; when a piston rod of the air cylinder I52 drives the driving rod I54 to move to the horizontal direction, the limiting mechanisms I57 and II 58 can limit and fix the L-shaped splicing pieces 6 and the sheet splicing pieces 7 of the underframe;

the clamping device I2 comprises a base II 21, an air cylinder II 22, a supporting rod II 23, a driving rod II 24, a pressing block I25 and a supporting column I26;

the base II 21 is fixedly arranged on the left side of the workbench 1, the cylinder body of the cylinder II 22 is fixedly arranged on the side part of the base II 21, the piston rod of the cylinder II 22 extends upwards, and the lower end of the support rod II 23 is fixedly connected with the top of the base II 21; the left end of the driving rod II 24 is hinged with the end part of a piston rod of the air cylinder I52, the left side of the middle part of the driving rod II 24 is hinged with the upper end of the supporting rod II 23, and the driving rod II 24 can be driven by the piston rod of the air cylinder II 22 to rotate in the vertical direction; the pressing block I25 is arranged at the tail end of the driving rod II 24 and is perpendicular to the driving rod II 24; the two support columns are vertically arranged and are respectively fixedly mounted on the right side of the upper portion of the base II 21, the support columns penetrate through mounting holes in the bottom of the L-shaped splicing pieces 6 of the underframe to support the L-shaped splicing pieces 6 of the underframe, and when a piston rod of the air cylinder II 22 drives the driving rod II to move to the horizontal direction, the pressing block I25 presses the L-shaped splicing pieces 6 of the underframe from top to bottom;

the clamping device I2 further comprises two support columns II 27, the two support columns II 27 are vertically arranged and fixedly mounted on the front side and the rear side of the middle of the base II 21 respectively, and the support columns II 27 and the support columns I26 are located on the same horizontal plane;

the clamping device II 3 comprises a driving device 8, a base III 31, an air cylinder III 32, a driving rod III 33, a pressing block II 34 and a pressing block III 35;

the driving device 8 is fixedly arranged at the rear side of the workbench 1, the base III 31 is fixedly arranged at the top of the driving device 8, and the driving device 8 can drive the base II 21 to move back and forth in the horizontal direction; the cylinder body of the air cylinder III 32 is arranged on the rear side of the top of the base, and the piston rod of the air cylinder III 32 extends to the front side along the horizontal direction; the upper part of the rear end of the driving rod III 33 is hinged with the end part of a piston rod of the air cylinder III 32, the lower part of the rear end of the driving rod III 33 is hinged with the top of the base III 31, and the driving rod III 33 can be driven by the piston rod of the air cylinder III 32 to rotate in the vertical direction; the pressing block II 34 is arranged on the front side of the top of the base III 31, and the pressing block III 35 is arranged at the front end of the driving rod III 33; when the driving device 8 drives the base III 31 to move forwards to the limit, the front side of the pressing block II 34 is contacted with the upper part of the rear side of the chassis sheet splicing piece 7; when a piston rod of the air cylinder III 32 drives the driving rod III 33 to move to the horizontal direction, the pressing block III 35 is matched with the pressing block II 34 from front to back to press the upper part of the bottom frame sheet splicing piece 7;

the clamping device III 4 comprises a driving device 8, a base IV 41, a cylinder IV 42, a supporting rod III 43, a driving rod IV 44, a pressing block IV 45 and a pressing block V46;

the driving device 8 is fixedly arranged on the right side of the workbench 1, the base IV 41 is fixedly arranged on the top of the driving device 8, and the driving device 8 can drive the base IV 41 to move left and right in the horizontal direction; the cylinder body of the air cylinder IV 42 is fixedly arranged on the side part of the base IV 41, the piston rod of the air cylinder IV 42 extends upwards, and the lower end of the support rod III 43 is fixedly connected with the top of the base IV 41; the right end of the driving rod IV 44 is hinged with the end part of a piston rod of the air cylinder IV 42, the right side of the middle part of the driving rod IV 44 is hinged with the top of the supporting rod III 43, and the driving rod IV 44 can be driven by the piston rod of the air cylinder IV 42 to rotate in the vertical direction; the pressing block IV 45 is arranged at the left end of the top of the base IV 41, and the pressing block V46 is arranged at the left end of the driving rod IV 44; when the driving device 8 drives the base IV 41 to move to the left side to the limit, the left side of the pressing block IV 45 is in contact with the right side of the L-shaped splicing piece 6 of the bottom frame; when a piston rod of the air cylinder IV 42 drives the driving rod IV 44 to move to the horizontal direction, the pressing block V46 presses the left side of the upper part of the L-shaped splicing piece 6 of the bottom frame from left to right;

the driving device 8 comprises a supporting seat 81, a sliding block 82, a guide rail 83, a driving cylinder 84 and a supporting plate 85; the supporting seat 81 is fixedly arranged at the rear side of the workbench 1, two guide rails 83 are arranged and respectively arranged at two sides of the supporting seat 81 in the length direction, the sliding block 82 is arranged on the guide rails 83 and can slide back and forth along the length direction of the guide rails 83, and the bottom of the supporting plate 85 is connected with the sliding block 82; the cylinder body of the driving cylinder 84 is fixedly arranged on the supporting seat 81, the piston rod of the driving cylinder 84 is connected with the side part of the supporting plate 85, and the piston rod of the driving cylinder 84 can drive the supporting plate 85 to slide back and forth along the length direction of the guide rail 83; the clamping device II 3 or the base of the clamping device II 3 is fixedly arranged on the supporting plate 85;

an included angle between the two connecting rods I55 is a right angle;

the limiting mechanisms I57 and II 58 comprise limiting columns, screw rods and screw caps, the screw rods penetrate through the through holes in the connecting plate 56 and extend outwards, the two screw caps are arranged on two sides of the connecting plate 56 on the screw rods, and the screw rods are fixed or loosened by rotating the screw caps; when the piston rod of the air cylinder I52 drives the driving rod I54 to move to the horizontal direction, the limiting columns of the limiting mechanisms I57 and II 58 are respectively over against the mounting holes of the chassis L-shaped splicing piece 6 and the chassis sheet splicing piece 7, the nuts are loosened, the limiting columns of the limiting mechanisms I57 and II 58 are extended out to be embedded into the corresponding mounting holes, and the nuts are screwed, so that the limiting fixation of the chassis L-shaped splicing piece 6 and the chassis sheet splicing piece 7 is realized.

The working process of the embodiment is as follows:

Claims

1. The utility model provides an automobile storage battery chassis welding jig, includes workstation (1), clamping device I (2), clamping device II (3), clamping device III (4), positioner (5), its characterized in that:

the clamping device I (2) is arranged on the left side of the workbench (1), the clamping device II (3) is arranged on the rear side of the workbench (1), the clamping device III (4) is arranged on the right side of the workbench (1), and the positioning device (5) is arranged on the front side of the workbench (1);

the clamping device I (2) supports the L-shaped splicing piece (6) of the underframe and clamps the lower part of the L-shaped splicing piece (6) of the underframe from top to bottom; the clamping device II (3) clamps the upper part of the bottom frame sheet splicing piece (7) from front to back, and the clamping device III (4) clamps the upper part of the bottom frame L-shaped splicing piece (6) from left to right;

the positioning device (5) comprises a base I (51), a cylinder I (52), a support rod I (53), a driving rod I (54), a connecting rod I (55), a connecting plate (56), a limiting mechanism I (57) and a limiting mechanism II (58);

the base I (51) is arranged on the front side of the workbench (1), a cylinder body of the cylinder I (52) is fixedly arranged on the side portion of the base I (51), a piston rod of the cylinder I (52) vertically extends upwards, and the lower end of the support rod I (53) is fixedly connected with the top of the base I (51); the front end of the driving rod I (54) is hinged with the end part of a piston rod of the air cylinder I (52), the front side of the middle part of the driving rod I (54) is hinged with the upper end of the supporting rod I (53), and the driving rod I (54) can rotate around the hinged part of the driving rod I (52) and the supporting rod I (53) under the driving of the piston rod of the air cylinder I (52); two connecting rods I (55) are arranged, one ends of the two connecting rods I (55) are connected with the rear end of the driving rod I (54), and the two connecting rods I (55) and the driving rod I (54) form a Y-shaped support together; the tail ends of the connecting rods I (55) are respectively and vertically connected with the inner side of the connecting plate (56); the two connecting plates (56) are respectively provided with a limiting mechanism I (57) and a limiting mechanism II (58); when a piston rod of the air cylinder I (52) drives the driving rod I (54) to move to the horizontal direction, the limiting mechanisms I (57) and II (58) can limit and fix the L-shaped splicing piece (6) of the bottom frame and the sheet splicing piece (7) of the bottom frame.

2. The welding jig for the underframe of the automobile storage battery as set forth in claim 1, characterized in that:

the clamping device I (2) comprises a base II (21), a cylinder II (22), a support rod II (23), a driving rod II (24), a pressing block I (25) and a support column I (26);

the base II (21) is fixedly arranged on the left side of the workbench (1), the cylinder body of the cylinder II (22) is fixedly arranged on the side part of the base II (21), the piston rod of the cylinder II (22) extends upwards, and the lower end of the support rod II (23) is fixedly connected with the top of the base II (21); the left end of the driving rod II (24) is hinged with the end part of a piston rod of the air cylinder I (52), the left side of the middle part of the driving rod II (24) is hinged with the upper end of the supporting rod II (23), and the driving rod II (24) can be driven by the piston rod of the air cylinder II (22) to rotate in the vertical direction; the pressing block I (25) is arranged at the tail end of the driving rod II (24) and is vertical to the driving rod II (24); the vertical two that are equipped with of support column, fixed mounting is in II (21) upper portion right side of base respectively, the support column run through the mounting hole of chassis L type splice (6) bottom, support chassis L type splice (6), when the piston rod of cylinder II (22) drives II movements of actuating lever to the horizontal direction, compact heap I (25) compress tightly chassis L type splice (6) from the top down.

3. The welding jig for the underframe of the automobile storage battery as set forth in claim 2, characterized in that:

clamping device I (2) still include support column II (27), support column II (27) vertically be equipped with two, fixed mounting is in the front and back both sides in II (21) middle part of base respectively, support column II (27) be located same horizontal plane with support column I (26).

4. The welding jig for the underframe of the automobile storage battery as set forth in claim 1, characterized in that:

the clamping device II (3) comprises a driving device (8), a base III (31), an air cylinder III (32), a driving rod III (33), a pressing block II (34) and a pressing block III (35);

the driving device (8) is fixedly arranged at the rear side of the workbench (1), the base III (31) is fixedly arranged at the top of the driving device (8), and the driving device (8) can drive the base II (21) to move back and forth in the horizontal direction; the cylinder body of the air cylinder III (32) is arranged on the rear side of the top of the base, and the piston rod of the air cylinder III (32) extends to the front side along the horizontal direction; the upper part of the rear end of the driving rod III (33) is hinged with the end part of a piston rod of the air cylinder III (32), the lower part of the driving rod III (33) is hinged with the top of the base III (31), and the driving rod III (33) can be driven by the piston rod of the air cylinder III (32) to rotate in the vertical direction; the pressing block II (34) is arranged on the front side of the top of the base III (31), and the pressing block III (35) is arranged at the front end of the driving rod III (33); when the driving device (8) drives the base III (31) to move forwards to the limit, the front side of the pressing block II (34) is in contact with the upper part of the rear side of the bottom frame sheet splicing piece (7); when a piston rod of the air cylinder III (32) drives the driving rod III (33) to move to the horizontal direction, the pressing block III (35) is matched with the pressing block II (34) from front to back to press the upper part of the bottom frame sheet splicing piece (7).

5. The welding jig for the underframe of the automobile storage battery as set forth in claim 1, characterized in that:

the clamping device III (4) comprises a driving device (8), a base IV (41), a cylinder IV (42), a supporting rod III (43), a driving rod IV (44), a pressing block IV (45) and a pressing block V (46);

the driving device (8) is fixedly arranged on the right side of the workbench (1), the base IV (41) is fixedly arranged on the top of the driving device (8), and the driving device (8) can drive the base IV (41) to move left and right in the horizontal direction; the cylinder body of the air cylinder IV (42) is fixedly arranged on the side part of the base IV (41), the piston rod of the air cylinder IV (42) extends upwards, and the lower end of the support rod III (43) is fixedly connected with the top of the base IV (41); the right end of the driving rod IV (44) is hinged with the end part of a piston rod of the air cylinder IV (42), the right side of the middle part of the driving rod IV (44) is hinged with the top of the supporting rod III (43), and the driving rod IV (44) can be driven by the piston rod of the air cylinder IV (42) to rotate in the vertical direction; the pressing block IV (45) is arranged at the left end of the top of the base IV (41), and the pressing block V (46) is arranged at the left end of the driving rod IV (44); when the driving device (8) drives the base IV (41) to move to the left side to the limit, the left side of the pressing block IV (45) is in contact with the right side of the L-shaped splicing piece (6) of the bottom frame; when a piston rod of the air cylinder IV (42) drives the driving rod IV (44) to move to the horizontal direction, the pressing block V (46) presses the left side of the upper part of the L-shaped splicing piece (6) of the bottom frame from left to right.

6. The welding jig for the underframe of the automobile storage battery as set forth in claim 4 or 5, characterized in that:

the driving device (8) comprises a supporting seat (81), a sliding block (82), a guide rail (83), a driving cylinder (84) and a supporting plate (85); the supporting seat (81) is fixedly arranged at the rear side of the workbench (1), two guide rails (83) are arranged and are respectively arranged at two sides of the supporting seat (81) in the length direction, the sliding block (82) is arranged on the guide rails (83) and can slide back and forth along the length direction of the guide rails (83), and the bottom of the supporting plate (85) is connected with the sliding block (82); the cylinder body of the driving cylinder (84) is fixedly arranged on the supporting seat (81), the piston rod of the driving cylinder (84) is connected with the side part of the supporting plate (85), and the piston rod of the driving cylinder (84) can drive the supporting plate (85) to slide back and forth along the length direction of the guide rail (83); the clamping device II (3) or the base of the clamping device II (3) is fixedly arranged on the supporting plate (85).

7. The welding jig for the underframe of the automobile storage battery as set forth in claim 1, characterized in that:

the included angle between two connecting rods I (55) is a right angle.

8. The welding jig for the underframe of the automobile storage battery as set forth in claim 1, characterized in that:

the limiting mechanisms I (57) and II (58) comprise limiting columns, screw rods and screw caps, the screw rods penetrate through holes in the connecting plate (56) and extend outwards, the two screw caps are arranged on two sides of the connecting plate (56) on the screw rods, and the screw rods are fixed or loosened by rotating the screw caps; when a piston rod of the air cylinder I (52) drives the driving rod I (54) to move to the horizontal direction, limiting columns of the limiting mechanisms I (57) and II (58) are respectively over against mounting holes of the chassis L-shaped splicing piece (6) and the chassis sheet splicing piece (7), nuts are loosened, the limiting columns of the limiting mechanisms I (57) and II (58) are controlled to stretch out and be embedded into the corresponding mounting holes, and the nuts are screwed to realize limiting fixation of the chassis L-shaped splicing piece (6) and the chassis sheet splicing piece (7).