CN114951939B

CN114951939B - Automatic welding tongs sliding table switching structure suitable for multiple vehicle types

Info

Publication number: CN114951939B
Application number: CN202210752148.5A
Authority: CN
Inventors: 尹安清; 何立新; 刘思珈; 吴明; 方尧金; 刘于瑞
Original assignee: Dongfeng Automobile Co Ltd
Current assignee: Dongfeng Automobile Co Ltd
Priority date: 2022-06-28
Filing date: 2022-06-28
Publication date: 2023-08-29
Anticipated expiration: 2042-06-28
Also published as: CN114951939A

Abstract

The invention provides an automatic welding tongs sliding table switching structure suitable for multiple vehicle types, which comprises a driving system, a turnover system sliding on the driving system, a limiting system for limiting the turnover system and an executing system for welding, wherein the executing system is fixedly connected with the turnover system, the driving system comprises a magnetic coupling type rodless cylinder, a first limiting block close to one end of the rodless cylinder and a second limiting block close to the other end of the rodless cylinder, and the rodless cylinder drives the turnover system and limits the movement range of the turnover system through the first limiting block and the second limiting block; the limiting system is positioned on one side of the driving system, and the movement of the overturning system is limited through a third limiting block. The invention can be used for automatic welding of vehicle types with different lengths, has the advantages of shorter overall length, small installation space, low manufacturing cost and difficult damage, and can realize multi-point welding of vehicle types with different lengths or widths by using one automatic welding tongs.

Description

Automatic welding tongs sliding table switching structure suitable for multiple vehicle types

Technical Field

The invention relates to the field of tooling welding equipment in the automobile manufacturing industry, in particular to an automatic welding clamp sliding table switching structure suitable for multiple automobile types.

Background

When automobile parts or white automobile body assembly are welded, a lot of places which are difficult to manually weld are assisted with automatic welding tongs, and when colinear common clamps of different automobile types are produced, the traditional automatic welding tongs are designed in different positions to fix different welding tongs or a rod cylinder is used for pushing a sliding table, and the automatic welding tongs are arranged on the sliding table for welding because the automobile type parts can translate and change in the length or width direction. When different welding tongs are designed and fixed at different positions, the welding tongs are equivalent to a plurality of automatic welding tongs, the design and installation layout space is insufficient, and the cost is high. When the cylinder with the rod is used, the whole mechanism is too long, and the problem of large occupied space still exists.

At present, the automatic welding device mostly adopts a moving mechanism formed by combining a servo motor, a servo driving control box and a screw rod mechanism, so that an automatic welding clamp moves on a sliding table, and multiple spot welding of one automatic welding clamp on a part or a vehicle body is realized. However, this automatic welding apparatus has the following problems: 1. the moving mechanism has large volume and needs larger installation space; 2. the servo motor and the screw rod are used, so that the requirement on the installation precision is high, and a plurality of matched parts are provided; 3. the lead screw receives large impulse when in reverse motion moment and stop, and is easy to damage; 4. interference with parts cannot be avoided in the operation process of the automatic welding tongs, unless a vertical lifting mechanism is added, the installation space and the weight of a moving mechanism are increased, and the moving mechanism with larger weight is more likely to damage a screw rod, so that the automatic welding device is invalid; 5. the servo motor, the servo drive control box and the screw mechanism have higher cost; 6. the screw cannot be self-locked, and a braking device is additionally arranged.

Disclosure of Invention

The invention aims to provide an automatic welding device for vehicle types with different lengths, which has the advantages of short overall length, small installation space, low manufacturing cost and difficult damage, and can realize multi-point welding for vehicle types with different lengths or widths by using one automatic welding pliers.

In order to achieve the above purpose, the present invention provides the following technical solutions: the automatic welding tongs sliding table switching structure suitable for multiple vehicle types comprises a driving system, a turnover system sliding on the driving system, a limiting system limiting the turnover system and an executing system for welding, wherein the executing system is fixedly connected with the turnover system,

the driving system comprises a rodless cylinder, a first limiting block close to one end of the rodless cylinder and a second limiting block close to the other end of the rodless cylinder, and the rodless cylinder drives the turnover system and limits the movement range of the turnover system through the first limiting block and the second limiting block;

the limiting system is positioned at one side of the driving system and comprises a limiting cylinder, a vertically arranged connecting plate and a rocker arm, wherein the cylinder body of the limiting cylinder is hinged with the connecting plate, one end of the rocker arm is hinged with the end part of a piston rod of the limiting cylinder, the other end of the rocker arm is fixedly provided with a third limiting block, the rocker arm is connected with the connecting plate through a rotating block, one end of the rotating block is fixedly connected with the rocker arm, and the other end of the rotating block is hinged with the connecting plate, so that the rocker arm can rotate around the connecting plate along with the extension of the piston rod of the limiting cylinder, and the third limiting block rotates to a vertical state together to limit the movement of the overturning system; the limiting system is fixed on one side of the driving system through a connecting plate.

Preferably, the limiting systems are provided with one or more, and the distance between the third limiting block and the first limiting block of each limiting system in the vertical state corresponds to the length of different vehicle bodies.

Preferably, the rocker arm is L-shaped and consists of a first rocker and a second rocker, one end of the first rocker is hinged with a piston rod of the limiting cylinder, the other end of the first rocker is fixed with the second rocker, the second rocker extends in a direction away from the connecting plate, the rotating block is fixed on the first rocker, and the third limiting block is fixed on the second rocker and is located on one side of a right angle formed by the first rocker and the second rocker.

Preferably, one side of the first rocker, which is close to the connecting plate, is provided with a U-shaped limiting groove with an outward opening, and a limiting clamping block matched with the limiting groove is fixed on the connecting plate, so that the limiting clamping block is gradually clamped into the limiting groove in the process of rotating to a vertical state, and the rocker is limited to further rotate.

Preferably, the connecting plate is fixed on one side of the driving system through a second mounting plate, and a backing plate is further arranged between the connecting plate and the second mounting plate.

Preferably, the driving system comprises a first base, two parallel first mounting plates vertically fixed on the first base and a guide rail fixed on the top of the first mounting plates, the rodless cylinder is fixed between the first two mounting plates and parallel to the first mounting plates, the rodless cylinder is a magnetic coupling type rodless cylinder and comprises a cylinder and a magnetic cylinder sliding block slidably sleeved on the cylinder, the turnover system is slidably arranged on the guide rail and fixedly connected with the cylinder sliding block, and the connecting plate is fixed on the first mounting plates.

Preferably, the turnover system comprises a second base parallel to the first base, a turnover cylinder for driving the execution system to turn over, a connecting square steel perpendicular to the guide rail and a mounting support, wherein fifth limiting blocks matched with the first limiting blocks and the second limiting blocks are arranged at two ends of the second base along the first length direction of the base, fourth limiting blocks matched with the third limiting blocks are arranged at one ends of the second base along the first length direction of the base, a vertical plate parallel to the mounting plate is arranged on the second base, the turnover cylinder perpendicular to the vertical plate is arranged above the vertical plate, the turnover cylinder is rotationally connected with the vertical plate, a rotating shaft parallel to the guide rail is arranged on one side of the vertical plate, which is far away from the limiting system, the connecting square steel is rotationally connected with the vertical plate through the rotating shaft, the mounting support is fixed at the other end of the connecting square steel, and the upper surface of the connecting square steel is rotationally connected with the end of a piston rod of the turnover cylinder.

Preferably, the lower surface of the second base is fixedly provided with a connecting block and a guide rail sliding block, the connecting block is fixedly connected with the air cylinder sliding block, and the guide rail sliding block is positioned on the guide rail.

Preferably, a buffering limit base, a limit plate and a buffer are sequentially arranged between the second base and the connecting square steel from bottom to top.

Preferably, the execution system comprises copper bars, copper bar mounting brackets and automatic welding tongs mounted in the mounting support, wherein two copper bars are arranged and are connected through air cooling cables to supply power to the upper end and the lower end of the automatic welding tongs respectively, insulating plates are arranged between the two copper bars and are fixed together in parallel through screws, the copper bars are fixed on the first base through the copper bar mounting brackets, and insulating plates are also arranged on contact surfaces between the copper bars and the copper bar mounting brackets.

The invention has the beneficial effects that:

1. the structure for controlling the movement and the limit of the automatic welding tongs is composed of the magnetic coupling type rodless cylinder, the first limit block, the second limit block and the limit system, so that the multipoint welding of one welding tongs is realized, the magnetic coupling type rodless cylinder has the advantages of small size, light weight, no external leakage and the like, the limit system is positioned on one side of the first bottom plate, the whole structure is compact, the space is saved, and compared with an automatic welding device using the rod cylinder, the length of the whole structure is shortened by more than half, and the installation space of the automatic welding device is greatly reduced.

2. The invention utilizes the limiting system and the first limiting blocks at one end of the base to limit the movement of the overturning system on the track, is suitable for automatic welding of vehicle types with different lengths or widths, and has the advantages of simple structure, convenient installation and difficult damage, and saves investment of a servo motor, a screw rod, a special servo drive control box control module and the like, wherein the limiting system, the overturning system and the rodless cylinder are controlled by the PLC control system.

3. According to the invention, the turnover mechanism is arranged, so that interference with parts in the operation process of the automatic welding tongs is avoided, the turnover system is driven by the rodless cylinder, the limit system limits the turnover system, and the turnover system and the execution system are not easy to damage and long in service life although the weight of the turnover system and the execution system is large.

4. According to the invention, the limiting mechanism can be added according to the welding positions of different vehicle types, so that the automatic welding device is suitable for automatic welding of more vehicle bodies with different lengths, and the use is flexible.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention;

FIG. 2 is a schematic view of another view of the present invention;

FIG. 3 is a schematic view of a spacing system according to the present invention;

FIG. 4 is a schematic view of the operation state of the limit system of the present invention;

FIG. 5 is a schematic diagram illustrating the operation of the present invention for welding a first vehicle model;

FIG. 6 is a schematic diagram illustrating operation of the present invention for welding a second vehicle model;

FIG. 7 is a schematic diagram illustrating the operation of the present invention for welding a third vehicle model;

reference numerals: the device comprises a first base 1, a first mounting plate 2, a rodless cylinder 3, a cover plate 4, a guide rail 5, a first limiting block 6, a limiting block base 7, a limiting cylinder 8, a connecting plate 9, a base plate 10, a second mounting plate 11, a third limiting block 12, a rocker 13, a first rocker 14, a second rocker 15, a limiting groove 16, a limiting clamping block 17, a rotating block 18, a second base 19, a guide rail sliding block 20, a connecting block 21, a vertical plate 22, a fifth limiting block 23, a fourth limiting block 24, a turnover cylinder 25, a fixed block 26, a rotating shaft 27, a rotating shaft fixed block 28, a rotating shaft connecting base 29, a connecting square steel 30, a mounting support 31, a third mounting plate 32, a buffering limiting base 33, a limiting plate 34, a buffer 35, an automatic welding tongs 36, a copper bar 37, a copper bar mounting bracket 38, an insulating plate 39 and a second limiting block 40.

Detailed Description

The invention will be described in further detail with reference to the drawings and the specific examples.

As shown in fig. 1 and 2, the automatic welding tongs sliding table switching mechanism suitable for multiple vehicle types comprises a driving system, a turnover system sliding on the driving system, a limiting system limiting the turnover system and an executing system for welding, wherein the executing system is fixedly connected with the turnover system.

The driving system comprises a rectangular base 1, two mounting plates 2 vertically fixed on the base 1, and a guide rail 5 fixed at the top of the mounting plates 2, wherein the two mounting plates are arranged in parallel along the length direction of the base 1, a rodless cylinder 3 is arranged between the two mounting plates in parallel, the rodless cylinder 3 is arranged on the base 1 through mounting seats at two ends, the rodless cylinder 3 comprises a cylinder and a magnetic cylinder sliding block slidably sleeved on the cylinder, a cover plate 4 is fixed on the rodless cylinder 3 along the length direction, two ends of the base 1 are respectively provided with a first limiting block 6 and a second limiting block 40 for limiting the sliding range of the overturning system on the guide rail 5, and the first limiting block 6 and the second limiting block 40 are fixed on a limiting block base 7.

The rodless cylinder 3 is a magnetic coupling type rodless cylinder 3, and the principle is that a group of high-intensity magnetic permanent magnetic rings are arranged on a piston, the magnetic rings on the piston are acted with the other group of cylinder sliding blocks with magnetic rings sleeved outside through a thin-wall cylinder barrel, the two groups of magnetic rings have opposite magnetism, and have stronger attraction force, and when the piston is pushed by air pressure in the cylinder barrel, the magnetic rings in the external cylinder sliding blocks are influenced by the magnetic rings on the piston to do synchronous motion under the action of the magnetic force.

As shown in fig. 3, the limiting system comprises a limiting cylinder 8 positioned at one side of a base 1, one end of a cylinder body of the limiting cylinder 8 close to the head is hinged with one side of the lower part of a connecting plate 9 parallel to a mounting plate 2, a rocker arm 13 is arranged at the end part of a piston rod of the limiting cylinder 8, the rocker arm 13 is of an L-shaped structure formed by a first rocker 14 and a second rocker 15, one end of the first rocker 14 is hinged with the end part of the piston rod, the other end of the first rocker 14 is fixedly connected with the second rocker 15 into a whole, the second rocker 15 extends in a direction far away from the connecting plate 9, a rotating block 18 is arranged at the middle part of the first rocker 14, one end of the rotating block 18 is fixedly connected with the first rocker 14, the other end of the rotating block is rotatably connected with the upper part of the connecting plate 9, and a third limiting block 12 is fixed on the second rocker 15 and positioned at one side of a right angle formed by the first rocker 14 and the second rocker 15; the first rocker 14 is provided with an outwards opened U-shaped limit groove 16 near one side of the connecting plate 9, the top of the connecting plate 9 is provided with a limit clamping block 17 matched with the limit groove 16, so that the third limit block 12 is gradually clamped into the limit groove 16 in the process of rotating to a vertical state, the limit clamping block 13 is further limited to rotate, the third limit block 12 is kept in the vertical state, the connecting plate 9 is fixed on the first mounting plate 2 through the mounting plate, a base plate 10 is further arranged between the connecting plate 9 and the first mounting plate 2, the lateral distance between a limit system and a driving system is increased, the limit system is convenient to limit, when a piston rod of the limit cylinder 8 extends, the driving rocker 13 rotates, the rocker 13 can be limited by a rotating block 18 to turn to the top of the connecting plate 9, the limit clamping block 17 is clamped into the limit groove 16, the rotation of the rocker 13 is limited, the third limit block 12 is kept in the vertical state, and is attached to the fourth limit block 24, so that the movement of the turnover system is limited.

The turnover system comprises a second base 19 parallel to the first base 1, a turnover cylinder 25 for driving the execution system to turn over, a square steel connecting part 30 perpendicular to the guide rail 5 and a mounting support 31, wherein a connecting block 21 and a guide rail slide block 20 are fixed on the lower surface of the second base 19, the connecting block 21 is fixedly connected with the side surface of the cylinder slide block through a bolt, and the guide rail slide block 20 is positioned on the guide rail 5, so that the turnover system can slide along with the cylinder slide block on the guide rail 5; the two ends of the second base 19 along the length direction of the first base 1 are provided with fifth limiting blocks 23 matched with the first limiting blocks 6 and the second limiting blocks 40, one end of the second base 1, which is close to the second limiting blocks 40, is provided with fourth limiting blocks 24 matched with the third limiting blocks 12, the fourth limiting blocks 24 are positioned on the outer side of the fifth limiting blocks 23, when the turnover system moves to the two ends of the first base 1, the fifth limiting blocks 23 are attached to the first limiting blocks 6 or the second limiting blocks 40, and when the limiting cylinder 8 pushes the third limiting blocks 12 to the vertical position and the turnover system moves to the position where the limiting system is located, the fourth limiting blocks 24 are attached to the third limiting blocks 12; the second base 19 is provided with a vertical plate 22 parallel to the first mounting plate 2, a turnover air cylinder 25 perpendicular to the vertical plate 22 is arranged above the vertical plate 22, the turnover air cylinder 25 is rotationally connected with the vertical plate 22 through two L-shaped fixing blocks 26 which are arranged on one side of the vertical plate 22 close to the limiting system in parallel, the turnover air cylinder 25 is positioned between the two fixing blocks 26, and the turnover air cylinder 25 can rotate in a plane perpendicular to the length direction of the first base 1. A rotating shaft 27 parallel to the guide rail 5 is arranged on one side, far away from the limit system, of the vertical plate 22, a rotating shaft connecting base 29 is fixed at one end of the connecting square steel 30, the rotating shaft connecting base 29 is rotationally connected with the vertical plate 22 through the rotating shaft 27, a mounting support 31 is fixed at the other end of the connecting square steel 30, a rotating shaft fixing block 28 is arranged at the end part of the rotating shaft 27, and the rotating shaft 27 rotates along with the rotating of the connecting square steel 30; a third mounting plate 32 is fixed in the middle of the upper surface of the connecting square steel 30, a support is fixed on the third mounting plate 32, the end part of a piston rod of the overturning cylinder 25 is rotationally connected with the support, and the connecting square steel 30 rotates by taking the rotating shaft 27 as the center of a circle along with the expansion and contraction of the piston rod; the buffer limiting base 33, the limiting plate 34 and the buffer 35 are sequentially arranged between the second base 19 and the connecting square steel 30 from bottom to top, and the buffer 35 can play a role in buffering in the downward rotation process of the connecting square steel 30.

The execution system comprises copper bars 37, copper bar mounting brackets 38 and automatic welding tongs 36 mounted in the mounting support 31, wherein the copper bars 37 are provided with two copper bars, the copper bars are connected through air cooling cables to supply power to the upper end and the lower end of the automatic welding tongs 36 respectively, insulating plates 39 are arranged between the two copper bars 37 and are fixed together in parallel through screws, the copper bars 37 are fixed on a base 1 through the copper bar mounting brackets 38, insulating plates 39 are also arranged on contact surfaces between the copper bars 37 and the copper bar mounting brackets 38, insulating pipes are further arranged at fixing screws between the copper bars 37 and the copper bar mounting brackets 38, and the insulating pipes and the insulating plates 39 are used for preventing current from being short-circuited at the positive and negative poles or current from flowing to other equipment through the copper bar mounting brackets 38.

The working principle of the invention is as follows:

as shown in fig. 5 to 7, the mechanism belongs to high-level automatic welding which cannot be welded manually, three different vehicle types can be welded, fig. 5 is a vehicle type with the shortest length, a fifth limiting block 23 of a turnover system is attached to a first limiting block 6 and is welded through an automatic welding tongs 36, fig. 6 is a vehicle type with the middle length, a fourth limiting block 24 of the turnover system is attached to a third limiting block 12 and is welded through the automatic welding tongs 36, fig. 7 is a vehicle type with the longest length, and a fifth limiting block 23 of the turnover system is attached to a second limiting block 40 and is welded through the automatic welding tongs 36. The vehicle types of different lengths are welded, the rollover system is moved to the corresponding position, and then welding is performed by the automatic welding tongs 36.

Taking a welded middle length vehicle model as an example, description will be made.

In the initial state, the overturning system is driven by the rodless cylinder 3 to move to the forefront end to be attached to the first limiting block 6.

After the welding is ready to start, firstly, the vehicle type is determined to be the vehicle type with the middle length, the piston rod of the limiting cylinder 8 is controlled to extend through a PLC control program, as shown in fig. 4, the rocker arm 13 is pushed to rotate around the connecting plate 9, the third limiting block 12 rotates along with the piston rod, the limiting clamping block 17 is gradually clamped into the limiting groove 16 in the rotating process, after the limiting clamping block 17 is completely clamped into the limiting groove 16, the rocker arm 13 is limited to continue rotating, and at the moment, the third limiting block 12 is in a vertical state and is exactly at the same height with the fourth limiting block 24 of the overturning system.

The overturning system is driven by the rodless cylinder 3 to enable the fourth limiting block 24 to be attached to the third limiting block 12. The piston rod of the tilting cylinder 25 of the tilting system is in a contracted state and the automatic welding tongs 36 have been rotated up to above the whole mechanism with the square steel 30 around the rotation shaft 27 to avoid interference with the vehicle body.

The automobile body is moved to the welding area on one side of the automatic welding tongs 36, the piston rod of the overturning cylinder 25 is controlled to extend through a PLC control program, the connecting square steel 30 is pushed to rotate downwards around the rotating shaft 27 through the mounting plate III 32, the automatic welding tongs 36 rotate to the welding height along with the connecting square steel 30, the buffer 35 is arranged between the base II 19 and the connecting square steel 30, the buffer stability effect can be achieved in the downward rotation process of the automatic welding tongs 36, and the welding can be started after the automatic welding tongs 36 rotate to the welding height.

After the welding is finished, the cylinder of the automatic welding tongs 36 is controlled to be opened through a PLC control program, then the piston rod of the overturning cylinder 25 is contracted, and the automatic welding tongs 36 are rotated upwards to the upper part of the whole mechanism, so that the welding of the vehicle body of the vehicle with the middle length is finished.

In the production process, if the vehicle type is always of the middle length, the welding position of the mechanism is unchanged, namely the fourth limiting block 24 is always attached to the third limiting block 12, if the vehicle type is switched, the whole automatic welding mechanism is controlled by a PLC, and the welding mechanism is driven by the rodless cylinder 3 to run to the position of a short vehicle type or a long vehicle type for welding.

The foregoing has shown and described the basic principles and main structural features of the present invention. The present invention is not limited to the above examples, and various changes and modifications may be made therein without departing from the spirit and scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The automatic welding tongs sliding table switching structure suitable for multiple vehicle types comprises a driving system, a turnover system sliding on the driving system, a limiting system limiting the turnover system and an executing system for welding, wherein the executing system is fixedly connected with the turnover system,

the driving system comprises a rodless cylinder (3), a first limiting block (6) close to one end of the rodless cylinder (3) and a second limiting block (40) close to the other end of the rodless cylinder (3), wherein the rodless cylinder (3) drives the turnover system and limits the movement range of the turnover system through the first limiting block (6) and the second limiting block (40);

the limiting system is located on one side of the driving system and comprises a limiting cylinder (8), a vertically arranged connecting plate (9) and a rocker arm (13), wherein a cylinder body of the limiting cylinder (8) is hinged with the connecting plate (9), one end of the rocker arm (13) is hinged with the end part of a piston rod of the limiting cylinder (8), a third limiting block (12) is fixed on the other end of the rocker arm, the rocker arm (13) is connected with the connecting plate (9) through a rotating block (18), one end of the rotating block (18) is fixedly connected with the rocker arm (13), the other end of the rotating block is hinged with the connecting plate (9), and accordingly the rocker arm (13) can rotate around the connecting plate (9) along with the extension of the piston rod of the limiting cylinder (8), and the third limiting block (12) rotates to a vertical state together to limit the movement of the overturning system; the limiting system is fixed on one side of the driving system through a connecting plate (9);

the rocker arm (13) is L-shaped and consists of a first rocker (14) and a second rocker (15), one end of the first rocker (14) is hinged to a piston rod of the limiting cylinder (8), the other end of the first rocker is fixed to the second rocker (15), an outwards opened U-shaped limiting groove (16) is formed in one side, close to the connecting plate (9), of the first rocker (14), a limiting clamping block (17) matched with the limiting groove (16) is fixed to the connecting plate (9), and the limiting clamping block (17) is gradually clamped into the limiting groove (16) in the process of rotating to a vertical state and further rotates to limit the rocker arm (13).

2. An automatic welding tongs sliding table switching structure adapted to multiple vehicle types according to claim 1, characterized in that the limit system is provided with one or more, and the distance between the third limit block (12) of each limit system and the first limit block (6) in the vertical state corresponds to the length of different vehicle bodies.

3. The automatic welding tongs sliding table switching structure suitable for multiple vehicle types according to claim 1, wherein the second rocking bar (15) extends in a direction away from the connecting plate (9), the rotating block (18) is fixed on the first rocking bar (14), and the third limiting block (12) is fixed on the second rocking bar (15) and is located on one side of a right angle formed by the first rocking bar (14) and the second rocking bar (15).

4. The automatic welding tongs sliding table switching structure suitable for multiple vehicle types according to claim 1, wherein the connecting plate (9) is fixed on one side of the driving system through a second mounting plate (11), and a backing plate (10) is further arranged between the connecting plate (9) and the second mounting plate (11).

5. An automatic welding tongs sliding table switching structure suitable for multiple vehicle types according to any one of claims 1 to 4, characterized in that the driving system comprises a first base (1), two parallel first mounting plates (2) vertically fixed on the first base (1), and a guide rail (5) fixed on the top of the first mounting plates (2), the rodless cylinder (3) is fixed between the two first mounting plates (2) and parallel to the first mounting plates (2), the rodless cylinder (3) is a magnetic coupling type rodless cylinder, and comprises a cylinder and a magnetic cylinder sliding block slidably sleeved on the cylinder, the turnover system is slidably arranged on the guide rail (5) and fixedly connected with the cylinder sliding block, and the connecting plate (9) is fixed on the first mounting plates (2).

6. The automatic welding tongs sliding table switching structure suitable for multiple vehicle types according to claim 5, wherein the turnover system comprises a second base (19) parallel to the first base (1), a turnover cylinder (25) for driving the execution system to turn over, a square steel (30) connected with the vertical plate (22) and a mounting support (31), the second base (19) is provided with a fifth limiting block (23) matched with the first limiting block (6) and the second limiting block (40) along two ends of the first base (1) in the length direction, one end of the second base (1) in the length direction is provided with a fourth limiting block (24) matched with the third limiting block (12), a vertical plate (22) parallel to the first mounting plate (2) is arranged on the second base (19), the turnover cylinder (25) perpendicular to the vertical plate (22) is arranged above the vertical plate (22), the turnover cylinder (25) is rotationally connected with the vertical plate (22), one side of the vertical plate (22) is provided with a square steel (27) parallel to the guide rail (5), one end of the vertical plate (22) is far away from the limiting system, the other end of the vertical plate (22) is fixedly connected with the square steel (30) through the rotating shaft (31), the upper surface of the connecting square steel (30) is rotationally connected with the end part of the piston rod of the overturning cylinder (25).

7. The automatic welding tongs sliding table switching structure suitable for multiple vehicle types according to claim 6, wherein a connecting block (21) and a guide rail sliding block (20) are fixed on the lower surface of the second base (19), the connecting block (21) is fixedly connected with the air cylinder sliding block (29), and the guide rail sliding block (20) is positioned on the guide rail (5).

8. The automatic welding tongs sliding table switching structure suitable for multiple vehicle types according to claim 6, wherein a buffering limit base (33), a limit plate (34) and a buffer (35) are sequentially arranged between the second base (19) and the connecting square steel (30) from bottom to top.

9. The automatic welding tongs sliding table switching structure suitable for multiple vehicle types according to claim 6, wherein the executing system comprises copper bars (37), copper bar mounting brackets (38) and automatic welding tongs (36) mounted in the mounting support (31), the copper bars (37) are provided with two copper bars, the copper bars are connected through air cooling cables to respectively supply power to the upper end and the lower end of the automatic welding tongs (36), insulating plates (39) are arranged between the two copper bars (37) and are fixed together in parallel through screws, the copper bars (37) are fixed on the base I (1) through the copper bar mounting brackets (38), and an insulating plate (39) is also arranged on a contact surface between the copper bars (37) and the copper bar mounting brackets (38).