CN114523181A

CN114523181A - Plasma welding device

Info

Publication number: CN114523181A
Application number: CN202210426373.XA
Authority: CN
Inventors: 王建; 王磊; 温克伟
Original assignee: Jiangsu Jiasheng Petroleum Technology Co ltd
Current assignee: Jiangsu Jiasheng Petroleum Technology Co ltd
Priority date: 2022-04-22
Filing date: 2022-04-22
Publication date: 2022-05-24

Abstract

The invention discloses a plasma welding device, which comprises a welding machine and a welding gun, wherein an adjusting cavity is arranged on the welding gun, a plurality of adjusting plates are arranged in the adjusting cavity, the side surface of one side of each adjusting plate is streamline, the side wall of each adjusting plate is connected with the inner wall of the adjusting cavity through two groups of telescopic assemblies, the side wall of each adjusting plate is rotatably connected with a swinging rod, the inner wall of the adjusting cavity is provided with a blocking plate, one end, far away from the swinging rod, of each blocking plate is rotatably connected with the inner wall of the adjusting cavity through a rotating shaft, the inner wall of the adjusting cavity is slidably connected with a sliding seat, the upper end of the sliding seat is provided with a supporting wheel, the side wall of each blocking plate is provided with a wedge part, the side wall of each supporting wheel is in contact with the side wall of the wedge part, the side wall of each sliding seat is fixedly connected with a connecting rod, the flowing speed of protective gas can be automatically adjusted, and the stability of the protective gas is ensured, the welding quality reduction caused by too large or too small air flow is avoided.

Description

Plasma welding device

Technical Field

The invention relates to the field of plasma welding, in particular to a plasma welding device.

Background

Plasma arc welding refers to a fusion welding method using high-energy density beam of plasma arc as a welding heat source. The plasma arc welding has the characteristics of energy concentration, high productivity, high welding speed, small stress deformation, stable electric arc, suitability for welding thin plates and box materials and the like, and is particularly suitable for welding various refractory metal materials which are easy to oxidize and have strong thermal sensitivity.

When the plasma welding machine works, if the working air pressure is far lower than the required air pressure, the ejection speed of the plasma arc is weakened, and the input air flow is smaller than the specified value, enough negative ions with high energy and high speed cannot be formed, so that the phenomena of poor quality of cut, cut-tight and cut accumulation are caused, and when the air pressure is too high, the concentrated arc column can be blown away by the overlarge air flow, so that the energy of the arc column is dispersed, and the working strength of the plasma arc is weakened.

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to provide a plasma welding device which can automatically adjust the flowing speed of shielding gas, ensure the stability of the shielding gas and avoid the reduction of welding quality caused by too large or too small air flow.

In order to solve the problems, the invention adopts the following technical scheme:

a plasma welding device comprises a welding machine and a welding gun, wherein an adjusting cavity is arranged on the welding gun, a plurality of adjusting plates are arranged in the adjusting cavity, the side surface of one side of the adjusting plate is provided with a streamline shape, the side wall of the adjusting plate is connected with the inner wall of the adjusting cavity through two groups of telescopic components, the side wall of the adjusting plate is rotatably connected with a swing rod, the inner wall of the adjusting cavity is provided with a blocking plate, one end of the barrier plate, which is far away from the swinging rod, is rotationally connected with the inner wall of the adjusting cavity through a rotating shaft, the inner wall of the adjusting cavity is connected with a sliding seat in a sliding way, the upper end of the sliding seat is provided with a supporting wheel, the side wall of the blocking plate is provided with a wedge-shaped part, the side wall of the supporting wheel is contacted with the side wall of the wedge-shaped part, the lateral wall fixedly connected with connecting rod of sliding seat, the connecting rod rotates with the swinging arms to be connected, the lateral wall of barrier plate still is provided with adjusting part.

Further, flexible subassembly includes the spout, be provided with the slide bar in the spout, one section of slide bar extends to the spout and is connected with the regulating plate outward, the both sides lateral wall of slide bar all is provided with the pulley, the inner wall of spout is provided with the slide rail with the supporting use of pulley.

Further, the adjusting part includes adjusting spring, adjusting spring is connected with the lateral wall of regulating plate, the fly leaf is installed to adjusting spring's the other end, the movable rod is installed to the opposite side of fly leaf, the inner wall of adjusting the chamber is provided with the through-hole, the movable rod runs through the through-hole, be provided with the sealing on the movable rod, the inner wall of through-hole is provided with a plurality of sealing washers, sealing and sealing washer swing joint, the one end of movable rod extends to the through-hole outside and is connected with screw thread portion, the lateral wall of adjusting the chamber is provided with the swivel nut, the inside of swivel nut is provided with the internal thread, screw thread portion and internal thread meshing.

Further, be provided with the chamber of admitting air in the welding machine, the inner wall sliding connection in chamber of admitting air has first otter board, the upper end lateral wall of first otter board is provided with the gyro wheel, the inner wall in chamber of admitting air is provided with the fixed block, the lower extreme lateral wall slope of fixed block sets up, the lateral wall of fixed block is provided with the spacing groove, the spacing groove is connected with the gyro wheel, be provided with a plurality of first meshs on the first otter board, the lateral wall of first otter board is provided with the brush, and the brush sets up with first meshs is crisscross, still be provided with the second otter board in the chamber of admitting air.

Furthermore, a plurality of second meshes are arranged on the second screen plate, the size of the second meshes is smaller than that of the first meshes, and the number of the second meshes is greater than that of the first meshes.

Further, the bottom in chamber of admitting air is provided with the slide, sliding connection has elastic telescopic rod in the slide, elastic telescopic rod's upper end and the lower extreme lateral wall fixed connection of first otter board, elastic telescopic rod includes automatic telescopic link, automatic telescopic link's both ends are connected with first otter board and slide respectively, the cover is equipped with buffer spring on the automatic telescopic link, buffer spring's both ends respectively with automatic telescopic link's stiff end and expansion end fixed connection.

Furthermore, the lateral wall of first otter board rotates and is connected with branch, the inner wall of adjusting the chamber rotates and is connected with first transfer line, the lower extreme lateral wall of second otter board rotates and is connected with the second transfer line, be equipped with unsettled slider in adjusting the chamber, the lateral wall and the branch swing of slider are connected, the opposite side lateral wall and the first transfer line and the second transfer line of slider rotate to be connected, the upper end lateral wall of second otter board passes through reset spring and is connected with the roof in the chamber that admits air, the slider is located between first otter board and the second otter board.

Further, the lateral wall of welding machine is provided with the air inlet, the air inlet with admit air the chamber intercommunication, and the air inlet integration is connected with the filter.

Furthermore, one side of the wedge-shaped part far away from the supporting wheel is fixedly connected with a stop block, one side of the stop block close to the supporting wheel is provided with a buffer layer, and the side wall of the upper end of the stop plate is arranged in a mode that the side wall is inclined upwards from the rotating shaft to the direction of the wedge-shaped part.

Further, the welding gun comprises an air feed pipe, the air feed pipe is fixedly sealed with the adjusting cavity, and the inner diameter of the air feed pipe is smaller than the distance between the adjusting plates.

Compared with the prior art, the invention has the advantages that:

(1) according to the scheme, when the gas flowing speed is high, the gas flow speeds on two sides of the adjusting plate are different, the adjusting plate can move towards the middle according to the judgment of fluid power, the adjusting plate drives the blocking plate to rotate, so that the flowing of the gas flow can be blocked, the gas flow speed is reduced, and when the gas flow is slow, the blocking plate is pulled by the spring to move back, so that the distance between the blocking plates is increased, the gas flow is larger, the speed is increased, the flowing speed of the shielding gas can be automatically adjusted, the stability of the shielding gas is ensured, and the welding quality reduction caused by too large or too small gas flow is avoided;

(2) the pulley and the sliding rail are matched, so that the friction force on the movement of the sliding rod is smaller, the adjusting plate is enabled to be faster and more stable when moving, and the sensitivity is higher;

(3) the position of the blocking plate can be manually adjusted by adjusting the spring and the movable plate, the flow and the speed of the air flow can be adjusted in various ways, the use is convenient, and the effect is better;

(4) the first screen plate and the second screen plate are arranged in the air inlet cavity, so that the entering air can be more uniform, and meanwhile, the first screen plate is blown by the air to move to drive the hairbrush to move, so that dust and dirt on the second screen plate are cleaned, the air inlet is ensured to be clean, the dust, dirt and the like in the air are prevented from influencing the flow of the air, and the welding quality is improved;

(5) the mesh number and size can ensure that the airflow can be more uniform when passing through the second screen plate, and the dust can be more conveniently cleaned, so that the cleaning effect is better;

(6) when the first screen plate descends, the supporting rod is driven to move, the supporting rod pushes the sliding block to move, and the sliding block pushes the first transmission rod and the second transmission rod to open, so that the second screen plate is driven to ascend, relative movement between the first screen plate and the second screen plate is more, and a better cleaning effect is achieved;

(7) the filter plate can effectively filter certain dust, dirt and the like, and the air inlet can smoothly receive outside air;

(8) the first screen plate and the brush are moved under the action of the fixed block and the elastic telescopic rod when the first screen plate moves, so that the second screen plate is effectively cleaned, and the first screen plate can be pushed to reversely move to return to the original position under the action of the buffer spring;

(9) the baffle block can block the supporting wheel to avoid the separation of the supporting wheel and the baffle block, and the buffer layer can reduce the collision on the supporting wheel;

(10) the air feed pipe and the adjusting cavity are arranged in a sealing mode, and therefore the air can be fully fed into the welding gun when flowing.

Drawings

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a schematic view of the structure of the intake chamber of the present invention;

FIG. 3 is a schematic view of a connection structure of a first net panel and a second net panel according to the present invention;

FIG. 4 is a schematic view of a connection structure of a first net plate and a fixing block according to the present invention;

FIG. 5 is a schematic view of a connection structure of the movable rod and the adjustment plate according to the present invention;

FIG. 6 is a schematic view showing a coupling structure of the supporting wheel and the blocking plate according to the present invention;

FIG. 7 is a schematic view of the structure of the barrier plate of the present invention;

FIG. 8 is a schematic structural view of the insert of the present invention;

FIG. 9 is a schematic view of the movable bar of the present invention;

FIG. 10 is a schematic view of an adjusting plate according to the present invention;

fig. 11 is a schematic view of the internal structure of the conditioning chamber of the present invention.

The reference numbers in the figures illustrate:

1. a welding machine; 2. a welding gun; 3. an adjustment chamber; 4. an adjusting plate; 5. a telescoping assembly; 6. a swing lever; 7. a blocking plate; 8. a sliding seat; 9. a support wheel; 10. a wedge portion; 11. a connecting rod; 12. adjusting the spring; 13. a movable plate; 14. a movable rod; 15. a sealing part; 16. a seal ring; 17. a threaded portion; 18. a threaded sleeve; 19. an internal thread; 20. an air inlet cavity; 21. a first screen plate; 22. a roller; 23. a fixed block; 24. a limiting groove; 25. a brush; 26. a second screen plate; 27. a slideway; 28. automatically telescoping the rod; 29. a buffer spring; 30. a strut; 31. a first drive lever; 32. a second transmission rod; 33. a slider; 34. a return spring; 35. a filter plate; 36. and a stop block.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1, 2, 4, 6 and 7, a plasma welding device includes a welding machine 1 and a welding gun 2, the welding gun 2 is provided with an adjusting cavity 3, the adjusting cavity 3 is provided with a plurality of adjusting plates 4, a side surface of one side of each adjusting plate 4 is streamline, a side wall of each adjusting plate 4 is connected with an inner wall of the adjusting cavity 3 through two sets of telescopic assemblies 5, the side wall of each adjusting plate 4 is rotatably connected with a swing rod 6, the inner wall of the adjusting cavity 3 is provided with a blocking plate 7, one end of each blocking plate 7 far away from the swing rod 6 is rotatably connected with the inner wall of the adjusting cavity 3 through a rotating shaft, the inner wall of the adjusting cavity 3 is slidably connected with a sliding seat 8, the upper end of the sliding seat 8 is provided with a supporting wheel 9, the side wall of each blocking plate 7 is provided with a wedge portion 10, the side wall of each supporting wheel 9 is in contact with the side wall of the wedge portion 10, the side wall of the sliding seat 8 is fixedly connected with a connecting rod 11, the connecting rod 11 is rotatably connected with the swing rod 6, and the side wall of the blocking plate 7 is also provided with an adjusting component.

When the gas flow speed becomes fast, the air flow speed through regulating plate 4 both sides is different, according to fluid power's judgement, regulating plate 4 can remove to the centre, regulating plate 4 drives blocking plate 7 and rotates, can block the flow of air current like this, thereby reduce the speed of air current, and when the air current becomes slow, then through spring pulling blocking plate 7 back movement, make blocking plate 7's interval grow, thereby make the air flow bigger, speed increase, can realize the speed that automatically regulated protective gas flows, guarantee its stability, avoid the welding quality decline that the too big or undersize of air current arouses.

Referring to fig. 11, the telescopic assembly 5 includes a sliding groove, a sliding rod is disposed in the sliding groove, one section of the sliding rod extends to the sliding groove and is connected with the adjusting plate 4, pulleys are disposed on side walls of two sides of the sliding rod, and a sliding rail used in cooperation with the pulleys is disposed on an inner wall of the sliding groove.

The cooperation of pulley and slide rail can make the frictional force that the removal of slide bar received littleer, guarantees like this that regulating plate 4 can be more rapid and stable when removing, and sensitivity is higher.

Referring to fig. 5, fig. 8 and fig. 9, the adjusting part includes adjusting spring 12, adjusting spring 12 is connected with the lateral wall of regulating plate 4, fly leaf 13 is installed to adjusting spring 12's the other end, movable rod 14 is installed to fly leaf 13's opposite side, the inner wall of adjusting chamber 3 is provided with the through-hole, movable rod 14 runs through the through-hole, be provided with sealing 15 on the movable rod 14, the inner wall of through-hole is provided with a plurality of sealing washer 16, sealing 15 and sealing washer 16 swing joint, the one end of movable rod 14 extends to the through-hole outside and is connected with screw thread portion 17, the lateral wall of adjusting chamber 3 is provided with swivel nut 18, the inside of swivel nut 18 is provided with internal thread 19, screw thread portion 17 and the meshing of internal thread 19.

The position of the baffle plate 7 can be manually adjusted through the adjusting spring 12 and the movable plate 13, the flow and the speed of the air flow can be adjusted through various modes, the use is convenient, and the effect is better; during adjustment, the movable rod 14 is rotated, the position of the sealing part 15 is adjusted through the meshing of the threaded part 17 and the threaded sleeve 18, the sealing part 15 is always in a sealing state with the sealing ring 16, the sealing inside the adjusting cavity 3 is ensured, and air flow leakage is avoided.

Referring to fig. 3 and 4, an air inlet cavity 20 is arranged in the welding machine 1, a first mesh plate 21 is connected to the inner wall of the air inlet cavity 20 in a sliding manner, a roller 22 is arranged on the side wall of the upper end of the first mesh plate 21, a fixed block 23 is arranged on the inner wall of the air inlet cavity 20, the side wall of the lower end of the fixed block 23 is arranged in an inclined manner, a limit groove 24 is arranged on the side wall of the fixed block 23, the limit groove 24 is connected with the roller 22, a plurality of first meshes are arranged on the first mesh plate 21, a brush 25 is arranged on the side wall of the first mesh plate 21, the brush 25 and the first meshes are arranged in a staggered manner, and a second mesh plate 26 is further arranged in the air inlet cavity 20.

Set up first otter board 21 and second otter board 26 in admitting air chamber 20 and can make the gas of entering more even, blow first otter board 21 through gas simultaneously and remove, drive brush 25 and remove to dust, dirty on the clearance second otter board 26, guarantee to admit air totally like this, avoid dust, dirty etc. in the gas to influence gaseous flow, improved welded quality.

Referring to fig. 2, the second net plate 26 is provided with a plurality of second net holes having a size smaller than that of the first net holes and a number greater than that of the first net holes.

Mesh quantity and size can guarantee that the air current can be more even when the second otter board 26 is passed through, moreover when the clearance dust, and is more convenient, and the clearance effect is better.

Referring to fig. 3, the bottom in air inlet chamber 20 is provided with slide 27, sliding connection has elastic telescopic rod in the slide 27, elastic telescopic rod's upper end and the lower extreme lateral wall fixed connection of first otter board 21, elastic telescopic rod includes automatic telescopic rod 28, automatic telescopic rod 28's both ends are connected with first otter board 21 and slide 27 respectively, the cover is equipped with buffer spring 29 on the automatic telescopic rod 28, buffer spring 29's both ends respectively with automatic telescopic rod 28's stiff end and expansion end fixed connection.

When the first screen plate 21 descends, the supporting rod 30 is driven to move, the supporting rod 30 pushes the sliding block 33 to move, the sliding block 33 pushes the first transmission rod 31 and the second transmission rod 32 to be opened, so that the second screen plate 26 is driven to ascend, relative movement between the first screen plate 21 and the second screen plate 26 is more, and a better cleaning effect is achieved.

Referring to fig. 3, a supporting rod 30 is rotatably connected to a side wall of the first screen plate 21, a first transmission rod 31 is rotatably connected to an inner wall of the adjusting cavity 3, a second transmission rod 32 is rotatably connected to a side wall of a lower end of the second screen plate 26, a suspended sliding block 33 is arranged in the adjusting cavity 3, a side wall of the sliding block 33 is connected to the supporting rod 30 in a swinging manner, a side wall of the other side of the sliding block 33 is rotatably connected to the first transmission rod 31 and the second transmission rod 32, a side wall of an upper end of the second screen plate 26 is connected to a top wall of the air inlet cavity 20 through a return spring 34, and the sliding block 33 is located between the first screen plate 21 and the second screen plate 26.

The filter plate 35 can effectively filter certain dust, dirt and the like, and the air inlet can smoothly receive outside air; when the first screen plate 21 moves, the first screen plate 21 and the hairbrush 25 move under the action of the fixed block 23 and the action of the elastic telescopic rod, so that the second screen plate 26 is effectively cleaned, and meanwhile, the first screen plate 21 can be pushed to reversely move to return to the original position under the action of the buffer spring 29.

Referring to fig. 1 and 2, the side wall of the welding machine 1 is provided with an air inlet which is communicated with the air inlet cavity 20 and is integrally connected with a filter plate 35.

Referring to fig. 6, a stopper 36 is fixedly connected to one side of the wedge-shaped portion 10 away from the supporting wheel 9, a buffer layer is disposed on one side of the stopper 36 close to the supporting wheel 9, and an upper end side wall of the stopper 7 is inclined upward from the rotating shaft toward the wedge-shaped portion 10; the supporting wheel 9 can be blocked by the stop block 36, so that the supporting wheel 9 is prevented from being separated from the stop block 36, and the buffer layer can reduce the collision on the supporting wheel 9.

Referring to fig. 1, the welding gun 2 includes an air supply pipe which is fixedly sealed with the adjustment chamber 3, and the inner diameter of the air supply pipe is smaller than the distance between the adjustment plates 4.

The air supply pipe and the adjusting cavity 3 are arranged in a sealing mode, and therefore the air flow can be fully fed into the welding gun 2 when flowing.

The foregoing is only a preferred embodiment of the present invention; the scope of the invention is not limited thereto. Any person skilled in the art should be able to cover the technical scope of the present invention by equivalent or modified solutions and modifications within the technical scope of the present invention.

Claims

1. A plasma welding device comprises a welding machine (1) and a welding gun (2), and is characterized in that: the welding gun adjusting device is characterized in that an adjusting cavity (3) is formed in the welding gun (2), a plurality of adjusting plates (4) are installed in the adjusting cavity (3), one side face of each adjusting plate (4) is streamline, the side wall of each adjusting plate (4) is connected with the inner wall of the adjusting cavity (3) through two sets of telescopic assemblies (5), the side wall of each adjusting plate (4) is rotatably connected with a swing rod (6), a blocking plate (7) is arranged on the inner wall of the adjusting cavity (3), one end, far away from the swing rod (6), of each blocking plate (7) is rotatably connected with the inner wall of the adjusting cavity (3) through a rotating shaft, the inner wall of the adjusting cavity (3) is slidably connected with a sliding seat (8), a supporting wheel (9) is arranged at the upper end of the sliding seat (8), a wedge-shaped part (10) is arranged on the side wall of each blocking plate (7), and the side wall of each supporting wheel (9) is in contact with the side wall of the wedge-shaped part (10), the lateral wall fixedly connected with connecting rod (11) of sliding seat (8), connecting rod (11) rotate with swinging arms (6) and are connected, the lateral wall of barrier plate (7) still is provided with adjusting part.

2. A plasma welding apparatus as defined in claim 1, wherein: the telescopic assembly (5) comprises a sliding groove, a sliding rod is arranged in the sliding groove, one section of the sliding rod extends to the sliding groove and is connected with the adjusting plate (4), pulleys are arranged on the side walls of the two sides of the sliding rod, and a sliding rail matched with the pulleys in use is arranged on the inner wall of the sliding groove.

3. A plasma welding apparatus as defined in claim 1, wherein: the adjusting component comprises an adjusting spring (12), the adjusting spring (12) is connected with the side wall of the adjusting plate (4), a movable plate (13) is arranged at the other end of the adjusting spring (12), a movable rod (14) is arranged at the other side of the movable plate (13), the inner wall of the adjusting cavity (3) is provided with a through hole, the movable rod (14) penetrates through the through hole, a sealing part (15) is arranged on the movable rod (14), a plurality of sealing rings (16) are arranged on the inner wall of the through hole, the sealing part (15) is movably sealed with the sealing ring (16), one end of the movable rod (14) extends out of the through hole and is connected with a thread part (17), the outer side wall of the adjusting cavity (3) is provided with a threaded sleeve (18), an internal thread (19) is arranged inside the threaded sleeve (18), and the threaded part (17) is meshed with the internal thread (19).

4. A plasma welding apparatus as defined in claim 2 wherein: be provided with air intake chamber (20) in welding machine (1), the inner wall sliding connection in air intake chamber (20) has first otter board (21), the upper end lateral wall of first otter board (21) is provided with gyro wheel (22), the inner wall in air intake chamber (20) is provided with fixed block (23), the lower extreme lateral wall slope of fixed block (23) sets up, the lateral wall of fixed block (23) is provided with spacing groove (24), spacing groove (24) are connected with gyro wheel (22), be provided with a plurality of first meshes on first otter board (21), the lateral wall of first otter board (21) is provided with brush (25), and brush (25) and the crisscross setting of first mesh, still be provided with second otter board (26) in air intake chamber (20).

5. A plasma welding apparatus as defined in claim 4, wherein: the second screen plate (26) is provided with a plurality of second meshes, the size of the second meshes is smaller than that of the first meshes, and the number of the second meshes is more than that of the first meshes.

6. A plasma welding apparatus as defined in claim 4, wherein: the bottom in chamber of admitting air (20) is provided with slide (27), sliding connection has elastic telescopic link in slide (27), elastic telescopic link's upper end and the lower extreme lateral wall fixed connection of first otter board (21), elastic telescopic link includes automatic telescopic link (28), the both ends of automatic telescopic link (28) are connected with first otter board (21) and slide (27) respectively, the cover is equipped with buffer spring (29) on automatic telescopic link (28), the both ends of buffer spring (29) respectively with the stiff end and the expansion end fixed connection of automatic telescopic link (28).

7. A plasma welding apparatus as defined in claim 6, wherein: the lateral wall of first otter board (21) rotates and is connected with branch (30), the inner wall of adjusting chamber (3) rotates and is connected with first transfer line (31), the lower extreme lateral wall of second otter board (26) rotates and is connected with second transfer line (32), be equipped with unsettled slider (33) in adjusting chamber (3), the lateral wall and the branch (30) swing of slider (33) are connected, the opposite side lateral wall and first transfer line (31) and second transfer line (32) of slider (33) rotate and are connected, the upper end lateral wall of second otter board (26) passes through reset spring (34) and is connected with the roof of admitting air chamber (20), slider (33) are located between first otter board (21) and second otter board (26).

8. A plasma welding apparatus as defined in claim 1, wherein: the side wall of the welding machine (1) is provided with an air inlet, the air inlet is communicated with the air inlet cavity (20), and the air inlet is integrally connected with a filter plate (35).

9. A plasma welding apparatus as defined in claim 1, wherein: one side fixedly connected with dog (36) that supporting wheel (9) were kept away from in wedge portion (10), dog (36) are close to one side of supporting wheel (9) and are provided with the buffer layer, the upper end lateral wall of baffle plate (7) is by the direction tilt up setting of pivot to wedge portion (10).

10. A plasma welding apparatus as defined in claim 1, wherein: the welding gun (2) comprises an air supply pipe, the air supply pipe is fixedly sealed with the adjusting cavity (3), and the inner diameter of the air supply pipe is smaller than the distance between the adjusting plates (4).