CN213003427U

CN213003427U - Quick change mechanism for clamp of automobile front wall lower main board assembly

Info

Publication number: CN213003427U
Application number: CN202021810284.8U
Authority: CN
Inventors: 陈志宇
Original assignee: Shaanxi Zhixin Machinery Manufacturing Co ltd
Current assignee: Shaanxi Zhixin Machinery Manufacturing Co ltd
Priority date: 2020-08-26
Filing date: 2020-08-26
Publication date: 2021-04-20
Anticipated expiration: 2030-08-26

Abstract

The utility model discloses a quick change mechanism for a clamp of a front wall lower main board assembly of an automobile, which comprises a clamp base and a quick change base, wherein a welding clamp is fixed on the clamp base, the clamp base is fixed on the quick change base, the clamp base is detachably connected with the quick change base, and the quick change base is fixed on the ground by using foundation bolts; the fixture base comprises a fixture bottom plate and a first channel steel supporting seat, the fixture bottom plate is fixed on the first channel steel supporting seat, a second quick-change connecting plate and a fourth quick-change connecting plate are fixed at the bottom of the first channel steel supporting seat, and a first quick-change connecting plate and a third quick-change connecting plate which correspond to the second quick-change connecting plate and the fourth quick-change connecting plate in a one-to-one mode are fixed at the top of the quick-change base; the second quick-change connecting plate is fixed on the first quick-change connecting plate, the fourth quick-change connecting plate is fixed on the third quick-change connecting plate, the second quick-change connecting plate is detachably connected with the first quick-change connecting plate, and the fourth quick-change connecting plate is detachably connected with the third quick-change connecting plate, so that the production cost is effectively reduced.

Description

Quick change mechanism for clamp of automobile front wall lower main board assembly

Technical Field

The utility model belongs to the technical field of new energy automobile and fuel automobile welding jig, a enclose mainboard assembly anchor clamps quick change mechanism down before car is related to.

Background

Different automobile parts need to be welded by using different welding fixtures, parts of different vehicle types can be produced on the same production line, and the design of the shape, the positioning hole and the positioning surface of the parts can be greatly different in different part structures. Therefore, one welding jig may not be simultaneously applied to the welding of parts of two or more vehicle models, and thus a welding jig corresponding to a vehicle model is required to be input in order to produce different vehicle models. However, the existing welding fixtures for automobile parts all adopt fixed fixtures, and the fixed fixtures are fixed on the ground through foundation bolts, so that in order to produce automobiles of different types, the welding fixtures corresponding to stations need to be replaced in time when the produced automobile type is replaced. In addition, if not change welding jig when the motorcycle type of change production, but directly increase welding station and fix welding jig, then because of welding robot's welding range is limited, probably need increase robot, soldering turret and operating personnel when the welding station of increase, and area increase, lead to manufacturing cost to increase. The utility model provides a mainboard assembly anchor clamps quick change mechanism under can solving before car of above-mentioned problem, can be applied to before new energy automobile and fuel automobile enclose mainboard assembly down.

Disclosure of Invention

An object of the utility model is to provide a mainboard assembly anchor clamps quick change mechanism under preceding enclosing of car to solve the problem that current fixed welding jig is not suitable for the quick change production of multiple motorcycle type, and increase the production of welding station in order to adapt to multiple motorcycle type and lead to the problem that manufacturing cost increases.

The technical scheme adopted by the embodiment of the utility model is that, a clamp quick-change mechanism for a front wall lower main board assembly of an automobile comprises a clamp base and a quick-change base, wherein a welding clamp is fixed on the clamp base, the clamp base is fixed on the quick-change base, the clamp base is detachably connected with the quick-change base, and the quick-change base is fixed on the ground by using foundation bolts;

the fixture base comprises a fixture bottom plate and a first channel steel supporting seat, the fixture bottom plate is fixed on the first channel steel supporting seat, and the fixture base is detachably connected with the quick-change base through the first channel steel supporting seat.

Furthermore, a second quick-change connecting plate and a fourth quick-change connecting plate are fixed at the bottom of the first channel steel supporting seat, and a first quick-change connecting plate and a third quick-change connecting plate which correspond to the second quick-change connecting plate and the fourth quick-change connecting plate in a one-to-one manner are fixed at the top of the quick-change base; the second quick-change connecting plate is fixed on the first quick-change connecting plate, the fourth quick-change connecting plate is fixed on the third quick-change connecting plate, the second quick-change connecting plate is detachably connected with the first quick-change connecting plate, and the fourth quick-change connecting plate is detachably connected with the third quick-change connecting plate.

Furthermore, two ends of the second quick-change connecting plate and two ends of the fourth quick-change connecting plate are respectively provided with a long-strip-shaped hole, and the long-strip-shaped holes in the second quick-change connecting plate and the fourth quick-change connecting plate are arranged along the length direction of the second quick-change connecting plate and the fourth quick-change connecting plate; threaded holes which are in one-to-one correspondence with the elongated holes at the two ends of the fourth quick-change connecting plate are formed in the third quick-change connecting plate, and threaded holes which are in one-to-one correspondence with the elongated holes at the two ends of the second quick-change connecting plate are formed in the first quick-change connecting plate; the first locking bolt and the fourth locking bolt respectively penetrate through one elongated hole in the second quick-change connecting plate in a one-to-one correspondence manner and are in threaded connection with the threaded hole in the first quick-change connecting plate; the second locking bolt and the third locking bolt respectively penetrate through one elongated hole in the fourth quick-change connecting plate in a one-to-one correspondence mode and are in threaded connection with the threaded hole in the third quick-change connecting plate.

Furthermore, one end of the second quick-change connecting plate and one end of the fourth quick-change connecting plate are provided with U-shaped positioning holes communicated with the end parts of the second quick-change connecting plate and the fourth quick-change connecting plate, the third quick-change connecting plate is provided with a first round positioning pin corresponding to the U-shaped positioning hole in the fourth quick-change connecting plate, and the first quick-change connecting plate is provided with a second round positioning pin corresponding to the U-shaped positioning hole in the second quick-change connecting plate; a second round positioning pin on the first quick-change connecting plate penetrates through a U-shaped positioning hole on the second quick-change connecting plate, and a first round positioning pin on the third quick-change connecting plate penetrates through a U-shaped positioning hole on the fourth quick-change connecting plate.

Further, the length of the second quick-change connecting plate is smaller than that of the first quick-change connecting plate, and the length of the fourth quick-change connecting plate is smaller than that of the third quick-change connecting plate;

and a first side face locking bolt support is fixed on one side face of one end of the first quick-change connecting plate, a second side face locking bolt support is fixed on one side face of one end of the third quick-change connecting plate, a fifth locking bolt is in threaded connection with one side face corresponding to the second quick-change connecting plate through the first side face locking bolt support, and a sixth locking bolt is in threaded connection with one side face corresponding to the fourth quick-change connecting plate through the second side face locking bolt support.

Furthermore, the first channel steel supporting seat is a cuboid frame formed by head-to-tail lap welding of a first channel steel, a second channel steel, a third channel steel and a fourth channel steel, and the lengths of the first channel steel and the third channel steel are greater than those of the second channel steel and the fourth channel steel; and the second quick-change connecting plate and the fourth quick-change connecting plate are both vertically and fixedly connected with the bottoms of the first channel steel and the third channel steel.

Furthermore, a fifth channel steel parallel to the second channel steel and the fourth channel steel is fixed in the middle of the inside of the first channel steel supporting seat and serves as a reinforcing rib; a first forklift opening penetrating through the first channel steel and the third channel steel is formed in the right side of the fifth channel steel, a second forklift opening penetrating through the first channel steel and the third channel steel is formed in the left side of the fifth channel steel, and the distances between the first forklift opening and the fifth channel steel are equal to the distances between the second forklift opening and the fifth channel steel;

the second quick-change connecting plate is arranged at the bottom of one side, away from the fifth channel steel, of the first forklift port, and the fourth quick-change connecting plate is arranged at the bottom of one side, away from the fifth channel steel, of the second forklift port.

Furthermore, the quick-change base comprises a second channel steel supporting seat and a quick-change base cover plate, the quick-change base cover plate is fixed on the second channel steel supporting seat, and the first quick-change connecting plate and the third quick-change connecting plate are fixed on the left side and the right side of the quick-change base cover plate in a one-to-one correspondence mode respectively.

Further, the second channel steel supporting seat is a cuboid frame formed by the head and tail lap-joint welding of a sixth channel steel, a seventh channel steel, an eighth channel steel and a ninth channel steel, four right-angle outsides of the second channel steel supporting seat are respectively fixed with a height adjusting support, a height adjusting bolt connected with the height adjusting support through threads is vertically arranged on the height adjusting support, and a bolt supporting disk is fixed to the bottom of the height adjusting bolt.

Furthermore, four right-angle bottoms of the first channel steel supporting seat are respectively provided with a roller, wherein the rollers close to the two right-angle bottoms of the first quick-change connecting plate are universal wheels, and the rollers at the remaining two right-angle bottoms are directional wheels.

The beneficial effects of the embodiment of the utility model are that, a mainboard assembly anchor clamps quick change mechanism under enclosing before car is provided, set up first channel-section steel supporting seat on the anchor clamps bottom plate and fix at subaerial quick change base, set up second quick change connecting plate and fourth quick change connecting plate bottom first channel-section steel supporting seat, set up first quick change connecting plate and third quick change connecting plate on the quick change base for second quick change connecting plate can be dismantled with first quick change connecting plate and be connected, and fourth quick change connecting plate can be dismantled with third quick change connecting plate and be connected. Through the disassembly and assembly of the second quick-change connecting plate and the first quick-change connecting plate and the disassembly and assembly of the fourth quick-change connecting plate and the third quick-change connecting plate, the welding fixtures of various vehicle types can be quickly switched on the same welding station without readjusting welding spot tracks, and the welding fixture is suitable for quick-change production of various vehicle types; and because a plurality of anchor clamps switch at same welding station, consequently can adopt same welding robot to carry out weldment work, practiced thrift the input of robot and soldering turret, reduced the demand to the production place, reduced the demand to operating personnel, reduced manufacturing cost effectively, solved current fixed welding jig and be not suitable for the problem of the quick change production of multiple motorcycle type to and increase the production of welding station in order to adapt to multiple motorcycle type and lead to the problem that manufacturing cost increases.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is the utility model discloses enclose mainboard assembly anchor clamps quick change mechanism's before car main view schematic diagram.

Fig. 2 is the utility model discloses before car enclose down mainboard assembly anchor clamps quick change mechanism's overlook schematic diagram.

Fig. 3 is a schematic view of a structure of the clamp base according to an embodiment of the present invention.

Fig. 4 is a schematic view of a composition structure of the quick-change base according to an embodiment of the present invention.

Fig. 5 is a schematic structural view of a height adjusting bracket according to an embodiment of the present invention.

In the drawing, 1, a clamp bottom plate, 2, a first channel steel supporting seat, 3, a first forklift opening, 4, a second forklift opening, 5, a pneumatic triple piece, 6, a second channel steel supporting seat, 7, a clamp base, 8, a quick-change base, 9, a roller, 10, a height adjusting bracket, 11, a first quick-change connecting plate, 12, a second quick-change connecting plate, 13, a third quick-change connecting plate, 14, a fourth quick-change connecting plate, 15, a first locking bolt, 16, a second locking bolt, 17, a third locking bolt, 18, a fourth locking bolt, 19, a first round positioning pin, 20, a second round positioning pin, 21, a fifth locking bolt, 22, a sixth locking bolt, 23, a first channel steel, 24, a second channel steel, 25, a third channel steel, 26, a fourth channel steel, 27, a fifth channel steel, 32, a quick-change base cover plate, 33, a sixth channel steel, 34, a seventh channel steel, 35, an eighth channel steel, 36. ninth channel steel, 41, a first side locking bolt support, 42, a second side locking bolt support, 43, a height adjusting bolt, 44, a bolt support plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The embodiment of the utility model provides a enclose mainboard assembly anchor clamps quick change mechanism before car, as shown in fig. 1~2, including anchor clamps base 7 and quick change base 8, anchor clamps base 7 mainly used sectional fixture, location and support anchor clamps base 7 when quick change base 8 mainly used anchor clamps switch, quick change base 8 uses rag bolt to fix subaerial, and anchor clamps base 7 fixes on quick change base 8, and anchor clamps base 7 can dismantle with quick change base 8 and be connected.

As shown in fig. 1 and fig. 3, the fixture base 7 comprises a fixture base plate 1 and a first channel steel support seat 2, the fixture base plate 1 is fixed on the first channel steel support seat 2, the connection mode between the first channel steel support seat 2 and the fixture base plate 1 adopts welding, enough welding faying surfaces are guaranteed for guaranteeing the strength after welding, at four right-angle sides of the first channel steel support seat 2 and the

fixture base plate

1, 2 welding seams are welded respectively, and at two overlapped sides of the first channel steel support seat 2 and the fixture base plate 1, a welding seam is welded respectively. The clamp bottom plate 1 is formed by machining rectangular steel (Q235A), the surface of the bottom plate is flat and smooth, the clamp bottom plate is mainly used for mounting a welding clamp, and the size of the clamp bottom plate 1 is designed according to the size of a part. The first channel steel supporting seat 2 is a cuboid frame formed by head-to-tail lap welding of a first channel steel 23, a second channel steel 24, a third channel steel 25 and a fourth channel steel 26, wherein the structural sizes of the first channel steel 23 and the third channel steel 25 are the same, the structural sizes of the second channel steel 24 and the fourth channel steel 26 are the same, and the length of the first channel steel 23 is greater than that of the second channel steel 24. The cavities of the first channel steel 23-the fourth channel steel 26 face outwards and are used for arranging clamp pipelines, and the clamp pipelines are shown in figure 3. The fifth channel steel 27 parallel to the second channel steel 24 and the fourth channel steel 26 is fixed at the middle position inside the first channel steel support seat 2 and serves as a reinforcing rib, and deformation of the clamp bottom plate 1 is prevented. A first forklift port 3 penetrating through the first channel steel 23 and the third channel steel 25 is arranged at 125mm of the right side of the fifth channel steel 27, a second forklift port 4 penetrating through the first channel steel 23 and the third channel steel 25 is arranged at 125mm of the left side of the fifth channel steel 27, the sizes of the first forklift port 3 and the second forklift port 4 are 200mm × 60mm, the sizes are designed according to the size of a forklift fork plate, and the fact that the forklift plate can be smoothly inserted into the first forklift port 3 and the second forklift port 4 is guaranteed, and large shaking is avoided. The bottom of the first channel steel supporting seat 2 is welded with a second quick-change connecting plate 12 and a fourth quick-change connecting plate 14, wherein the second quick-change connecting plate 12 is arranged at the bottom of one side, away from the fifth channel steel 27, of the first forklift mouth 3, and the fourth quick-change connecting plate 14 is arranged at the bottom of one side, away from the fifth channel steel 27, of the second forklift mouth 4. And four right angle bottoms of first channel-section steel supporting seat 2 are provided with gyro wheel 9 respectively, and gyro wheel 9 passes through the four right angle bottoms of gyro wheel scaffold weldment at first channel-section steel supporting seat 2. The idler wheels 9 are two universal wheels, two directional wheels, specifically, the idler wheels 9 at the two right-angle bottoms close to the first quick-change connecting plate 11 are the universal wheels, the idler wheels 9 at the remaining two right-angle bottoms are the directional wheels, the universal wheels are used for turning when the clamp is detached and moved conveniently, and the directional wheels are used for directionally moving the clamp after turning.

As shown in fig. 1 and 4, the quick-change base 8 includes a second channel steel supporting seat 6 and a quick-change base cover plate 32, the second channel steel supporting seat 6 is a cuboid frame formed by head-to-tail lap welding of a sixth channel steel 33, a seventh channel steel 34, an eighth channel steel 35 and a ninth channel steel 36, the quick-change base cover plate 32 is fixed (welded) on the second channel steel supporting seat 6, two sides of the quick-change base cover plate are welded and fixed with a first quick-change connecting plate 11 and a third quick-change connecting plate 13, a height adjusting support 10 is respectively fixed outside four right angles of the second channel steel supporting seat 6, and the height adjusting support 10 is used for adjusting the levelness of the fixture. Specifically, as shown in fig. 5, a height adjusting bolt 43 in threaded connection with the height adjusting bracket 10 is vertically arranged on the height adjusting bracket, and a bolt supporting plate 44 is fixed at the bottom of the height adjusting bolt 43. When the levelness of the clamp base 7 needs to be adjusted, the locking nut of the foundation bolt for fixing the quick-change base 8 can be loosened, and then the height of the corresponding part of the clamp base 7 from the ground is adjusted by adjusting the corresponding height adjusting bolt 43 so as to adjust the levelness of the clamp base 7.

The fixture base 7 and the quick-change base 8 are fixedly connected through a first quick-change connecting plate 11-a fourth quick-change connecting plate 14, specifically, the second quick-change connecting plate 12 is fixed on the first quick-change connecting plate 11, and the fourth quick-change connecting plate 14 is fixed on the third quick-change connecting plate 13.

As shown in fig. 2 and 4, the second quick-change coupling plate 12 has a length smaller than that of the first quick-change coupling plate 11, and the fourth quick-change coupling plate 14 has a length smaller than that of the third quick-change coupling plate 13. A first side face locking bolt support 41 is fixed on the side face of the first quick-change connecting plate 11, a second side face locking bolt support 42 is fixed on the side face of the third quick-change connecting plate 13, the fifth locking bolt 21 is fixedly connected with the corresponding side face of the second quick-change connecting plate 12 through the first side face locking bolt support 41, and the sixth locking bolt 22 is fixedly connected with the corresponding side face of the fourth quick-change connecting plate 14 through the second side face locking bolt support 42, so as to lock the clamp in the Y direction through the second quick-change connecting plate 12 and the fourth quick-change connecting plate 14.

As shown in fig. 2, two ends of the second quick-change connecting plate 12 and the fourth quick-change connecting plate 14 under the fixture base 7 are respectively provided with a strip-shaped hole, and the strip-shaped holes on the second quick-change connecting plate 12 and the fourth quick-change connecting plate 14 are both arranged along the length direction thereof; threaded holes which are in one-to-one correspondence with the elongated holes at the two ends of the fourth quick-change connecting plate 14 are formed in the third quick-change connecting plate 13, and threaded holes which are in one-to-one correspondence with the elongated holes at the two ends of the second quick-change connecting plate 12 are formed in the first quick-change connecting plate 11; the first locking bolt 15 and the fourth locking bolt 18 respectively penetrate through one elongated hole on the second quick-change connecting plate 12 in a one-to-one correspondence manner and are in threaded connection with the threaded hole on the first quick-change connecting plate 11; the second locking bolt 16 and the third locking bolt 17 respectively penetrate through one elongated hole on the fourth quick-change connecting plate 14 in a one-to-one correspondence manner to be in threaded connection with the threaded hole on the third quick-change connecting plate 13, so as to lock the second quick-change connecting plate 12 and the fourth quick-change connecting plate 14 in the Z direction. In addition, one end of the second quick-change connecting plate 12 and one end of the fourth quick-change connecting plate 14 are provided with U-shaped positioning holes communicated with the end parts of the two quick-change connecting plates, the third quick-change connecting plate 13 is provided with a first round positioning pin 19 corresponding to the U-shaped positioning hole on the fourth quick-change connecting plate 14, and the first quick-change connecting plate 11 is provided with a second round positioning pin 20 corresponding to the U-shaped positioning hole on the second quick-change connecting plate 12; the second round positioning pin 20 on the first quick-change connecting plate 11 passes through the U-shaped positioning hole on the second quick-change connecting plate 12, and the first round positioning pin 19 on the third quick-change connecting plate 13 passes through the U-shaped positioning hole on the fourth quick-change connecting plate 14, so as to lock the second quick-change connecting plate 12 and the fourth quick-change connecting plate 14 in the X direction. In addition, the pneumatic triple 5 corresponding to the cylinder in the welding jig on the jig base plate 1 is fixed to one side of the jig base 7, specifically, one side of the first channel steel support base 2, as shown in fig. 1.

When the fixture is designed, the installation dimension of the fixture base 7 (the aperture and the pitch of each installation hole on the fixture base 7) is designed according to the installation dimension of the quick-change base 8, the size of the fixture base plate 1 is designed according to the size of a part, and meanwhile, the design of the installation dimension is also considered, if the two parts are different, the larger part is preferentially used as the basis for designing the installation dimension, so different fixtures installed on the fixture base 7 can be installed on the same quick-change base 8, and the same quick-change base 8 can adapt to different fixtures. When the clamp is replaced, the first locking bolts 15-the fourth locking bolts 18 are removed, the fifth locking bolts 21 and the sixth locking bolts 22 are loosened, the forklift can fork the whole clamp through the first forklift opening 3 and the second forklift opening 4 on the clamp base 7, and the clamp can be switched quickly.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims

1. The clamp quick-change mechanism for the automobile front wall lower main board assembly is characterized by comprising a clamp base (7) and a quick-change base (8), wherein a welding clamp is fixed on the clamp base (7), the clamp base (7) is fixed on the quick-change base (8), the clamp base (7) is detachably connected with the quick-change base (8), and the quick-change base (8) is fixed on the ground by using foundation bolts;

the fixture base (7) comprises a fixture bottom plate (1) and a first channel steel supporting seat (2), the fixture bottom plate (1) is fixed on the first channel steel supporting seat (2), and the fixture base (7) is detachably connected with the quick-change base (8) through the first channel steel supporting seat (2).

2. The quick-change mechanism for the clamp of the automobile front lower main plate assembly according to claim 1, wherein a second quick-change connecting plate (12) and a fourth quick-change connecting plate (14) are fixed at the bottom of the first channel steel supporting seat (2), and a first quick-change connecting plate (11) and a third quick-change connecting plate (13) which correspond to the second quick-change connecting plate (12) and the fourth quick-change connecting plate (14) in a one-to-one manner are fixed at the top of the quick-change base (8); the second quick-change connecting plate (12) is fixed on the first quick-change connecting plate (11), the fourth quick-change connecting plate (14) is fixed on the third quick-change connecting plate (13), the second quick-change connecting plate (12) is detachably connected with the first quick-change connecting plate (11), and the fourth quick-change connecting plate (14) is detachably connected with the third quick-change connecting plate (13).

3. The quick-change mechanism for the clamp of the automobile front lower main plate assembly according to claim 2, wherein two ends of the second quick-change connecting plate (12) and the fourth quick-change connecting plate (14) are respectively provided with an elongated hole, and the elongated holes in the second quick-change connecting plate (12) and the fourth quick-change connecting plate (14) are arranged along the length direction of the elongated holes; threaded holes which are in one-to-one correspondence with the elongated holes at the two ends of the fourth quick-change connecting plate (14) are formed in the third quick-change connecting plate (13), and threaded holes which are in one-to-one correspondence with the elongated holes at the two ends of the second quick-change connecting plate (12) are formed in the first quick-change connecting plate (11); the first locking bolt (15) and the fourth locking bolt (18) respectively penetrate through one elongated hole in the second quick-change connecting plate (12) in a one-to-one correspondence mode and are in threaded connection with the threaded hole in the first quick-change connecting plate (11); the second locking bolt (16) and the third locking bolt (17) respectively penetrate through one elongated hole in the fourth quick-change connecting plate (14) in a one-to-one correspondence mode and are in threaded connection with the threaded hole in the third quick-change connecting plate (13).

4. The quick-change mechanism for the clamp of the automobile front lower main plate assembly according to claim 2 or 3, wherein one end of the second quick-change connecting plate (12) and one end of the fourth quick-change connecting plate (14) are provided with U-shaped positioning holes communicated with the end portions of the second quick-change connecting plate and the fourth quick-change connecting plate, the third quick-change connecting plate (13) is provided with a first round positioning pin (19) corresponding to the U-shaped positioning hole in the fourth quick-change connecting plate (14), and the first quick-change connecting plate (11) is provided with a second round positioning pin (20) corresponding to the U-shaped positioning hole in the second quick-change connecting plate (12); a second round positioning pin (20) on the first quick-change connecting plate (11) penetrates through a U-shaped positioning hole on the second quick-change connecting plate (12), and a first round positioning pin (19) on the third quick-change connecting plate (13) penetrates through a U-shaped positioning hole on the fourth quick-change connecting plate (14).

5. The clamp quick-change mechanism for the automobile front lower main plate assembly according to claim 4, characterized in that the length of the second quick-change connecting plate (12) is smaller than that of the first quick-change connecting plate (11), and the length of the fourth quick-change connecting plate (14) is smaller than that of the third quick-change connecting plate (13);

a first side face locking bolt support (41) is fixed to one end side face of the first quick-change connecting plate (11), a second side face locking bolt support (42) is fixed to one end side face of the third quick-change connecting plate (13), the fifth locking bolt (21) is in threaded connection with one end side face corresponding to the second quick-change connecting plate (12) through the first side face locking bolt support (41), and the sixth locking bolt (22) is in threaded connection with one end side face corresponding to the fourth quick-change connecting plate (14) through the second side face locking bolt support (42).

6. The clamp quick-change mechanism for the automobile front lower main plate assembly according to claim 2, 3 or 5, characterized in that the first channel steel support seat (2) is a cuboid frame formed by head-to-tail lap welding of a first channel steel (23), a second channel steel (24), a third channel steel (25) and a fourth channel steel (26), and the lengths of the first channel steel (23) and the third channel steel (25) are greater than the lengths of the second channel steel (24) and the fourth channel steel (26); the second quick-change connecting plate (12) and the fourth quick-change connecting plate (14) are both vertically and fixedly connected with the bottoms of the first channel steel (23) and the third channel steel (25).

7. The clamp quick-change mechanism for the automobile front lower main plate assembly according to claim 6, characterized in that a fifth channel steel (27) parallel to the second channel steel (24) and the fourth channel steel (26) is fixed at a middle position inside the first channel steel support seat (2) and serves as a reinforcing rib; a first forklift opening (3) penetrating through the first channel steel (23) and the third channel steel (25) is formed in the right side of the fifth channel steel (27), a second forklift opening (4) penetrating through the first channel steel (23) and the third channel steel (25) is formed in the left side of the fifth channel steel (27), and the distances between the first forklift opening (3) and the fifth forklift opening (27) and the distances between the second forklift opening (4) and the fifth channel steel (27) are equal;

the second quick-change connecting plate (12) is arranged at the bottom of one side, away from the fifth channel steel (27), of the first forklift opening (3), and the fourth quick-change connecting plate (14) is arranged at the bottom of one side, away from the fifth channel steel (27), of the second forklift opening (4).

8. The quick-change mechanism for the jigs of the automobile front lower main plate assembly according to claim 2, 3 or 5, wherein the quick-change base (8) comprises a second channel steel support seat (6) and a quick-change base cover plate (32), the quick-change base cover plate (32) is fixed on the second channel steel support seat (6), and the first quick-change connecting plate (11) and the third quick-change connecting plate (13) are respectively fixed on the left side and the right side of the quick-change base cover plate (32) in a one-to-one correspondence manner.

9. The quick-change mechanism for the clamp of the automobile front lower main plate assembly according to claim 8, wherein the second channel steel support seat (6) is a rectangular frame formed by welding a sixth channel steel (33), a seventh channel steel (34), an eighth channel steel (35) and a ninth channel steel (36) in an end-to-end lap joint manner, a height adjusting support (10) is respectively fixed on the four right-angle outer portions of the second channel steel support seat (6), a height adjusting bolt (43) in threaded connection with the height adjusting support (10) is vertically arranged on the height adjusting support (10), and a bolt support plate (44) is fixed at the bottom of the height adjusting bolt (43).

10. The quick-change mechanism for the clamp of the automobile front lower main plate assembly according to any one of claims 1 to 3, 5, 7 or 9, characterized in that one roller (9) is respectively arranged at four right-angle bottoms of the first channel steel supporting seat (2), wherein the rollers (9) at two right-angle bottoms close to the first quick-change connecting plate (11) are universal wheels, and the rollers (9) at the remaining two right-angle bottoms are directional wheels.