Asymmetric axis rotating electric arc TIG welding gun

Abstract

The utility model belongs to the technical field of electric welding, and particularly relates to an asymmetric rotating electric arc TIG welding gun which comprises a gun shell, a center rotating system, a conductive system, a wire feeding and gas feeding system and a control system, the gun shell comprises an upper shell body and a lower shell body, water serves as a heat exchange medium through the effect of a water cooling system, efficiency is higher than that of air cooling, and the effect is good. According to the scheme, the device is used for non-axisymmetric rotating electric arc welding, a large amount of heat is generated in the welding gun in the process of driving a tungsten electrode to rotate at a high speed, a water cooling system is beneficial to improving the heat dissipation efficiency of a gun head and reducing the loss of easily-damaged parts such as the tungsten electrode, an electric arc column is stable, and the welding quality is improved. And the service life of internal parts is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of electric welding, in particular to an asymmetric axis rotating arc TIG welding gun. Background Art

[0002] In recent years, the global consumption of liquefied natural gas has grown rapidly. The construction of large liquefied natural gas (LNG) storage tanks can greatly reduce the cost of natural gas storage and transportation. 9% Ni steel has become the preferred material for the construction of LNG storage tanks because of its excellent low-temperature toughness at -196°C. Therefore, the demand for 9% Ni steel has greatly increased.

[0003] Currently, TIG welding guns on the market can be divided into water-cooled and air-cooled according to different cooling methods. The air-cooled type uses air as the cooling medium, which has a relatively low cooling efficiency and is not suitable for long-term high-current welding.

[0004] Therefore, an asymmetric axis rotating arc TIG welding gun is proposed to solve the above problems. Utility Model Content

[0005] The utility model aims to provide an asymmetric axis rotating arc TIG welding gun to solve the problem that the air-cooled type proposed in the above background technology uses air as the cooling medium, has a relatively low cooling efficiency and is not suitable for long-term high-current welding.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an asymmetric axis rotating arc TIG welding gun, comprising a gun housing, a water cooling system, a central rotating system, a conductive system, a wire feeding and air feeding system and a control system, wherein the gun housing comprises an upper shell and a lower shell, the water cooling system comprises a circulating water pipe, the left end of the circulating water pipe is a water outlet, the right end of the circulating water pipe is a water inlet, the circulating water pipe is located inside the gun housing, the central rotating system comprises a central shaft, a motor and an insulating coupling, the central shaft is connected to the power output end of the motor through the insulating coupling, the lower end of the insulating coupling is connected to the upper end of the tungsten electrode The tungsten electrode is connected to each other, the lower end of the tungsten electrode is a non-axisymmetric tip, the non-axisymmetric tip is 45°, the conductive system includes a conical copper block, the left and right sides of the inside of the conical copper block are provided with wiring holes, the inner wall of the conical copper block is in contact with the outer wall surface of the central axis, the contact upper wall of the central axis and the conical copper block is provided with a conical surface, a spring is installed below the conical copper block, a top pressure piece is installed below the spring, the wire feeding and air feeding system includes a wire feeding tube, an air hood, a sliding rod and a mounting plate, the mounting plate is sleeved on the middle part of the outer wall of the gun housing, the control system includes a motor control box, and the motor control box is electrically connected to the motor.

[0007] Preferably, a hinge is installed between the mounting plate and the wire feeding tube, and the wire feeding tube is hinged to the mounting plate through the hinge.

[0008] Preferably, an air inlet is provided on the upper wall surface of the air hood, the sliding rod is slidably connected to the air hood, and the air hood is connected to the mounting plate via the sliding rod.

[0009] Preferably, an upper cover body is provided at the upper end of the gun housing, and a lower cover body is provided at the lower end of the gun housing.

[0010] Preferably, a tungsten pole clamp is installed at the connection between the tungsten pole and the central axis, and a nut is screwed on the lower end of the central axis.

[0011] Preferably, a bluing piece is provided on the outer side of the conical copper block.

[0012] Preferably, a bearing is installed on the upper surface of the outer wall of the central shaft.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1) Through the effect of the water cooling system, water is used as the medium for heat exchange, which is more efficient than air cooling and has a higher allowable current. It is suitable for additive manufacturing of large and thick parts and large current continuous welding. This device is used for non-axisymmetric rotary arc welding. A large amount of heat is generated inside the welding gun when driving the tungsten electrode to rotate at high speed. The water cooling system is beneficial to improving the heat dissipation efficiency of the gun head, reducing the loss of vulnerable parts such as the tungsten electrode, stabilizing the arc column, and increasing the service life of internal components.

[0015] 2) Through the cooperation among the gun housing, central rotation system, conductive system, wire feeding and gas feeding system, the distance between the non-axisymmetric tip of the tungsten electrode and the two sides of the vertical seam changes periodically, and the arc periodically and stably heats the two sides of the vertical seam to solve the problem of side wall fusion.

[0016] 3) Through the cooperation between the conical copper block and the conical surface opened on the upper wall of the central axis, the conductive contact area is increased, the conductive stability is improved, and stable welding with large current is achieved. The spring pushes the conical copper block upward to ensure that it is in close contact with the central axis for conduction. When the welding gun is used for a long time and the conical surface of the copper block is worn, resulting in poor contact, the top pressure piece can be adjusted upward to restore good contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the front structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the internal structure of the gun housing of the utility model;

[0019] Figure 3 It is a schematic diagram of the three-dimensional structure of the gas hood of the utility model.

[0020] In the figure: 1. gun housing; 2. upper cover; 3. lower cover; 4. mounting plate; 5. slide rod; 6. gas hood; 7. tungsten electrode; 8. wire feeding tube; 9. hinge; 10. motor; 11. insulating coupling; 12. bearing; 13. center axis; 14. tungsten electrode clamp; 15. nut; 16. wiring hole; 17. conical copper block; 18. blueing part; 19. spring; 20. air inlet; 21. top pressure part; 22. water inlet; 23. water outlet. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0024] Example:

[0025] See also Figure 1-3The utility model provides a technical solution: an asymmetric axis rotating arc TIG welding gun, comprising a gun housing 1, a water cooling system, a central rotating system, a conductive system, a wire feeding and air feeding system and a control system. The gun housing 1 is cylindrical, with a diameter of 73 mm, a length of 222 mm, and a total length of the gun body of 295 mm. The gun housing 1 comprises an upper shell and a lower shell. The water cooling system comprises a circulating water pipe. In addition to the circulating water pipe, the water cooling system also comprises a water pump and a cooling water tank. The outlet of the water pump is connected to the water inlet 22, and the water outlet is connected to the inside of the cooling water tank through a hollow pipe. The left end of the circulating water pipe is the water outlet 23, and the right end of the circulating water pipe is the water inlet 22. The circulating water pipe is located inside the gun shell 1. The shell material is insulating bakelite, which mainly ensures the insulation between the welding gun fixture and the welding gun to prevent high frequency arcing; the lower shell material is aluminum, and the central axis 13 and the nut 15 are made of steel. After bluing treatment, a layer of oxide film is produced on the metal surface to isolate the air and achieve the purpose of rust prevention. The wire feeding is realized by an argon arc welding fully automatic wire feeder and a wire feeding tube 8. The wire feeding tube is made of aluminum alloy copper plating. The wire feeding tube 8 is hinged to the outside of the gun body so that the angle and height of the wire feeding tube 8 can be adjusted at will. The gas hood 6 is made of aluminum and is slidably connected to the outside of the gun shell 1 through a sliding rod 5. The tungsten electrode 7 passes through the gas hood 6 from the center. The gas hood 6 can With the up and down adjustment, the gas hood 6 covers the upper part of the weld groove during welding to protect the entire weld. The good coordination of wire feeding and gas protection ensures the stability of the welding process during multi-layer welding. The central rotation system includes a central axis 13, a motor 10 and an insulating coupling 11. The central axis 13 is connected to the power output end of the motor 10 through the insulating coupling 11. The lower end of the insulating coupling 11 is connected to the upper end of the tungsten pole 7. The lower end of the tungsten pole 7 is a non-axisymmetric tip, and the non-axisymmetric tip is 45°. The conductive system includes a conical copper block 17. Wiring holes 16 are provided on both sides of the inner side of the conical copper block 17. The wiring holes 16 are used to connect welding cables. The inner wall of the conical copper block 17 is in contact with the outer wall surface of the central axis 13, and a conical surface is provided on the contact upper wall between the central axis 13 and the conical copper block 17. A spring 19 is installed below the conical copper block 17, and a top pressure piece 21 is installed below the spring 19. The wire feeding and gas feeding system includes a wire feeding tube 8, an air hood 6, a slide rod 5 and a mounting plate 4. The mounting plate 4 is sleeved on the middle part of the outer wall of the gun housing 1. The control system includes a motor control box, which is electrically connected to the motor 10. The motor control box is an external component of the welding gun. The remote wire-controlled motor 10 can realize the forward and reverse rotation of the tungsten electrode 7, and can also adjust different speeds to control the rotation frequency of the arc.

[0026] Among them, a hinge 9 is installed between the mounting plate 4 and the wire feeding tube 8, and the wire feeding tube 8 is hinged to the mounting plate 4 through the hinge 9. An air inlet 20 is opened on the upper wall surface of the gas hood 6, and the air inlet 20, the sliding rod 5 and the gas hood 6 are slidably connected, and the gas hood 6 is connected to the mounting plate 4 through the sliding rod 5. An upper cover body 2 is provided at the upper end of the gun housing 1, and a lower cover body 3 is provided at the lower end of the gun housing 1. A tungsten electrode clamp 14 is installed at the connection between the tungsten electrode 7 and the center axis 13, and a nut 15 is screwed on the lower end of the center axis 13. A blueing piece 18 is provided on the outer side of the conical copper block 17, and a bearing 12 is installed on the upper surface of the outer wall of the center axis 13.

[0027] Working principle: During welding, the gas hood 6 covers the upper part of the weld groove. When the gas enters the gas hood 6, it first fills the entire gas hood, which has a buffer for the gas, reduces the gas flow rate, and reduces the Reynolds coefficient, thereby forming a laminar flow of the protective gas. After the argon gas enters the gas hood 6 through the air inlet 20, it can fill the entire gas hood by utilizing its diffusion, and then flows out of the gas hood to protect the weld. The wire feeding tube 8 evenly transports the welding wire or solder to the end of the tungsten electrode 7. The power output end of the motor 10 drives the central shaft 13 to rotate through the insulating coupling 11, and the central shaft 13 drives the tungsten electrode 7 to rotate, converting electrical energy into thermal energy, and using the electric arc to melt the welding wire. The distance between the non-axisymmetric tip of the tungsten electrode and the two sides of the vertical seam changes periodically, and the electric arc periodically and stably heats the two sides of the vertical seam to complete the welding. During the welding process, cold water enters the circulating water pipe through the water inlet 22, absorbs heat, and is then discharged from the water outlet 23.

[0028] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the attached claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the utility model, and any figure marks in the claims should not be regarded as limiting the claims involved.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An asymmetric axis rotating arc TIG welding gun, comprising a gun housing (1), a water cooling system, a central rotating system, a conductive system, a wire feeding system, a gas feeding system and a control system, characterized in that: The gun housing (1) comprises an upper housing and a lower housing, the water cooling system comprises a circulating water pipe, the left end of the circulating water pipe is a water outlet (23), the right end of the circulating water pipe is a water inlet (22), the circulating water pipe is located inside the gun housing (1), the central rotation system comprises a central shaft (13), a motor (10) and an insulating coupling (11), the central shaft (13) is connected to the power output end of the motor (10) through the insulating coupling (11), the lower end of the insulating coupling (11) is connected to the upper end of the tungsten pole (7), the lower end of the tungsten pole (7) is a non-axisymmetric tip, the non-axisymmetric tip is 45°, the conductive system comprises a conical copper block (1 7), the left and right sides of the conical copper block (17) are provided with wiring holes (16), the inner wall of the conical copper block (17) is in contact with the outer wall surface of the central axis (13), the contact upper wall of the central axis (13) and the conical copper block (17) is provided with a conical surface, a spring (19) is installed below the conical copper block (17), and a top pressure piece (21) is installed below the spring (19), the wire feeding and air feeding system comprises a wire feeding tube (8), an air hood (6), a sliding rod (5) and a mounting plate (4), the mounting plate (4) is sleeved on the middle part of the outer wall of the gun housing (1), and the control system comprises a motor control box, and the motor control box is electrically connected to the motor (10).

2. The asymmetric axis rotating arc TIG welding gun according to claim 1, characterized in that: A hinge (9) is installed between the mounting plate (4) and the wire feeding tube (8), and the wire feeding tube (8) is hingedly connected to the mounting plate (4) via the hinge (9).

3. The asymmetric axis rotating arc TIG welding gun according to claim 1, characterized in that: An air inlet (20) is provided on the upper wall surface of the air hood (6); the sliding rod (5) is slidably connected to the air hood (6); and the air hood (6) is connected to the mounting plate (4) via the sliding rod (5).

4. The asymmetric axis rotating arc TIG welding gun according to claim 1, characterized in that: An upper cover body (2) is arranged at the upper end of the gun housing (1), and a lower cover body (3) is arranged at the lower end of the gun housing (1).

5. The asymmetric axis rotating arc TIG welding gun according to claim 1, characterized in that: A tungsten pole clamp (14) is installed at the connection between the tungsten pole (7) and the central shaft (13), and a nut (15) is screwed on the lower end of the central shaft (13).

6. The asymmetric axis rotating arc TIG welding gun according to claim 1, characterized in that: A blueing piece (18) is arranged on the outer side of the conical copper block (17).

7. The asymmetric axis rotating arc TIG welding gun according to claim 1, characterized in that: A bearing (12) is installed on the upper surface of the outer wall of the central shaft (13).

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