TIG (Tungsten Inert Gas) welding gun for all-position additive repair of inner wall of small-diameter threaded hole

Abstract

The invention relates to the technical field of thread welding repair, and provides a TIG (Tungsten Inert Gas) welding gun for all-position additive repair of the inner wall of a small-diameter threaded hole, which comprises a welding gun head, a radial sliding table, a rotary driving device and an axial driving device, the radial sliding table is suitable for driving the welding gun head to move in the radial direction. The rotation driving device is connected with the radial sliding table, and the rotation driving device is suitable for driving the radial sliding table to rotate in the axis direction of the radial sliding table; the axial driving device is connected with the rotating driving device, and the axial driving device is suitable for driving the rotating device to move in the axial direction of the rotating device. Movement of the gun head of the welding gun in multiple directions can be effectively achieved, and additive repairing operation can be conducted on all-position damaged areas of the inner wall of a small-diameter threaded hole through the gun head of the welding gun.

Description

Technical Field

[0001] The invention relates to the technical field of thread welding repair, and in particular to a TIG welding gun used for all-position additive repair of the inner wall of a small-diameter threaded hole. Background Art

[0002] TIG welding is a welding method that uses an infusible tungsten electrode to generate an arc under the protection of an inert gas to heat and melt the workpiece. It has high welding quality. The inert gas can effectively protect the arc and the molten pool to prevent oxidation and the mixing of impurities. It has high welding efficiency and can achieve high-speed and continuous welding. It has high welding flexibility and can adapt to welding of different thicknesses, different positions, and different forms. Therefore, TIG welding is widely used in aerospace, nuclear energy, automobile manufacturing, shipbuilding, chemical industry, and medical equipment industries.

[0003] At present, the rail transit equipment industry faces the problem of repairing damaged threaded holes, and there are difficulties such as a large number of damaged parts and diverse structures of damaged threaded holes. Threaded hole repair technology is a repair technology that uses welding to build up and re-tap damaged threaded holes. It can not only ensure the repair quality, but also save a lot of manufacturing costs. It is one of the key technologies in the field of threaded hole repair.

[0004] Traditional repair welding technology mostly uses manually operated welding equipment, which is relatively convenient for repairing large-diameter threaded holes. However, when dealing with small-diameter threads, it greatly increases the difficulty of implementing traditional repair welding technology and is limited by welding equipment. Summary of the invention

[0005] In order to overcome the shortcomings and deficiencies in the prior art, the present invention provides a TIG welding gun for all-position additive repair of the inner wall of a small-diameter threaded hole, which can effectively realize the movement of the welding gun head in multiple directions, so that it can perform additive repair operations on damaged areas at all positions on the inner wall of a small-diameter threaded hole.

[0006] The present invention provides a TIG welding gun for all-position additive repair of the inner wall of a small-diameter threaded hole, comprising: Welding gun tip; A radial sliding platform, the radial sliding platform is connected to the welding gun head, and the radial sliding platform is suitable for driving the welding gun head to move radially; A rotation driving device, the rotation driving device is connected to the radial sliding table, and the rotation driving device is suitable for driving the radial sliding table to rotate along its own axis direction; An axial driving device is connected to the rotary driving device, and the axial driving device is suitable for driving the rotary device to move along its own axial direction.

[0007] According to the present invention, a TIG welding gun for all-position additive repair of the inner wall of a small-diameter threaded hole is provided. The welding gun head has a connecting end and a welding end that are relatively arranged. The connecting end is connected to the radial sliding table. The welding end is provided with a tungsten electrode, a wire feeding hole and a plurality of air outlet holes. The plurality of air outlet holes are arranged in a ring around the tungsten electrode. The wire feeding hole is inclined toward the tungsten electrode. A gas channel and a wire feeding pipe are opened in the welding gun head along its own axial direction. The gas channel is connected to the air outlet hole, and the wire feeding pipe is connected to the wire feeding hole.

[0008] According to a TIG welding gun for all-position additive repair of the inner wall of a small-diameter threaded hole provided by the present invention, an air-water distribution chamber is provided at the end of the welding gun head close to the connecting end, and the air-water distribution chamber is respectively connected to an external air supply device and an external water cooling device to provide protective gas for the gas channel and provide cooling for the welding gun head.

[0009] According to a TIG welding gun for all-position additive repair of the inner wall of a small-diameter threaded hole provided by the present invention, the gas-water distribution chamber includes an air inlet groove, a water inlet groove, a water outlet groove and a plurality of sealing grooves opened along the outer peripheral wall of the welding gun head, the plurality of sealing grooves are alternately arranged with the air inlet groove, the water inlet groove and the water outlet groove, the air inlet groove is connected to the gas channel through an air inlet hole, the water inlet groove and the water outlet groove are annular and connected to each other, and the sealing groove is suitable for installing a sealing ring to seal and space the air inlet groove, the water inlet groove and the water outlet groove.

[0010] According to a TIG welding gun for all-position additive repair of the inner wall of a small-diameter threaded hole provided by the present invention, the TIG welding gun for all-position additive repair of the inner wall of a small-diameter threaded hole also includes an air-water distribution sleeve, the air-water distribution sleeve is outermostly arranged on the outside of the air-water distribution chamber, the inner wall surface of the air-water distribution sleeve abuts against a plurality of the sealing rings, and the two ends of the air-water distribution sleeve along the axial direction are rotatably connected to the welding gun head through bearings.

[0011] According to the present invention, a TIG welding gun for all-position additive repair of the inner wall of a small-diameter threaded hole is provided. The TIG welding gun for all-position additive repair of the inner wall of a small-diameter threaded hole also includes a conductive ear, an insulating sliding sleeve and an annular conductive block. One side of the conductive ear is rotatably connected to the welding gun head through the insulating sliding sleeve, and the other side opposite to the conductive ear is electrically connected to the welding gun head through the annular conductive block.

[0012] According to a TIG welding gun for all-position additive repair of the inner wall of a small-diameter threaded hole provided by the present invention, the radial sliding table includes a slide seat, a radial slider, a radial screw and a radial motor, the slide seat is connected to the rotation drive device, the radial screw is installed on the slide seat and extends radially, the radial slider is connected to the welding gun head, and the radial slider is connected to the radial screw, and the radial motor is used to drive the radial slider to reciprocate on the radial screw.

[0013] According to a TIG welding gun for all-position additive repair of the inner wall of a small-diameter threaded hole provided by the present invention, the rotary drive device includes a rotary motor, a hollow shaft, a second gear set and a gear box body, the rotary motor, the hollow shaft and the second gear set are installed on the gear box body, the rotary motor is connected to the hollow shaft through the second gear set, and the hollow shaft is connected to the radial sliding table.

[0014] According to a TIG welding gun for all-position additive repair of the inner wall of a small-diameter threaded hole provided by the present invention, the axial drive device includes a housing, an axial motor, an axial slider, a linear bearing and an axial screw. The axial motor, the axial slider, the linear bearing and the axial screw are installed on the housing. The axial screw is extended along the axis, the axial slider is connected to the rotary drive device, the axial slider is slidably matched with the axial screw, the axial motor is drivingly connected to the axial screw, and the axial motor is suitable for driving the axial screw to rotate so as to drive the axial slider to reciprocate on the axial screw.

[0015] According to the present invention, a TIG welding gun for all-position additive repair of the inner wall of a small-diameter threaded hole is provided. The TIG welding gun for all-position additive repair of the inner wall of a small-diameter threaded hole also includes a wire feeding device, the wire feeding device includes a wire feeding reel, a connecting bracket, a wire drawing mechanism, a straightening mechanism and a support frame, the support frame is connected between the wire drawing mechanism and the rotary drive device, the wire drawing mechanism is connected to the wire feeding reel through the connecting bracket, and the straightening mechanism is arranged between the wire feeding reel and the wire drawing mechanism.

[0016] The TIG welding gun provided by the present invention is used for all-position additive repair of the inner wall of a small-diameter threaded hole. A radial sliding table is provided to be connected to the welding gun head, and the radial sliding table drives the welding gun head to move radially; a rotary driving device is provided to be connected to the radial sliding table, and the rotary driving device drives the radial sliding table to rotate along its own axial direction; an axial driving device is provided to be connected to the rotary driving device, and the axial driving device drives the rotary device to move along its own axial direction; wherein the radial sliding table realizes the radial movement of the welding gun head, the rotary driving device realizes the rotary movement of the welding gun head, and the axial driving device realizes the axial movement of the welding gun head, thereby effectively realizing the movement of the welding gun head in multiple directions, so that it can perform additive repair operations on damaged areas of the inner wall of a small-diameter threaded hole at all positions, and has the ability to be used in more complex working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic structural diagram of a TIG welding gun for all-position additive repair of the inner wall of a small-diameter threaded hole according to the present invention; Figure 2 It is a schematic structural diagram of a TIG welding gun for all-position additive repair of the inner wall of a small-diameter threaded hole according to the present invention, wherein the welding gun cover and the gear box cover are removed; Figure 3 It is a schematic structural diagram of a welding gun head in a TIG welding gun for all-position additive repair of the inner wall of a small-diameter threaded hole according to the present invention; Figure 4 It is a schematic diagram of a half-section structure of a welding gun head in a TIG welding gun used for all-position additive repair of the inner wall of a small-diameter threaded hole according to the present invention; Figure 5 It is a structural schematic diagram of a radial sliding table in a TIG welding gun used for all-position additive repair of the inner wall of a small-diameter threaded hole according to the present invention.

[0019] Figure 6 It is a structural schematic diagram of a rotary drive device for removing a gear box cover in a TIG welding gun used for all-position additive repair of the inner wall of a small-diameter threaded hole according to the present invention.

[0020] Figure 7 It is a top view of the wire feeding device in the TIG welding gun used for all-position additive repair of the inner wall of a small-diameter threaded hole according to the present invention.

[0021] Figure 8It is a front view of the wire feeding device in a TIG welding gun used for all-position additive repair of the inner wall of a small-diameter threaded hole according to the present invention.

[0022] Fig. 9 It is a structural schematic diagram of an axial drive device without a mounting cover in a TIG welding gun for all-position additive repair of the inner wall of a small-diameter threaded hole according to the present invention.

[0023] Reference numerals: 100. TIG welding gun for full-position additive repair of the inner wall of small-diameter threaded holes; 1. Welding gun head; 11. Tungsten electrode; 12. Wire feeding hole; 13. Air outlet hole; 14. Gas channel; 15. Wire feeding pipeline; 16. Air-water distribution chamber; 161. Air inlet groove; 161a. Air inlet hole; 162. Water inlet groove; 163. Water outlet groove; 164. Sealing groove; 17. Wire guide nozzle; 18. Conductive ear; 181. Terminal block; 19. Insulated sliding sleeve; 20. Annular conductive block; 201. Bearing; 202. Set screw; 203. Electrode mounting seat; 2. radial sliding table; 21. sliding seat; 22. radial motor; 23. radial slider; 24. radial screw; 25. first gear set; 26. radial guide rod; 27. radial limit switch; 3. Rotary drive device; 31. Gear box; 32. Rotary motor; 33. Second gear set; 34. Hollow shaft; 35. Electric slip ring; 36. Positioning ear; 37. Positioning sleeve; 4. Axial drive device; 41. Housing; 42. Axial motor; 43. Axial slider; 44. Axial screw; 45. Axial guide rod; 46. Axial limit switch; 47. Conveyor belt assembly; 48. Linear bearing; 5. Gas-water distribution sleeve; 51. Water inlet pipe; 52. Water outlet pipe; 53. Air inlet pipe; 54. Communication channel; 6. Sealing ring; 7. Wire feeding device; 71. Wire feeding disc; 72. Connecting bracket; 73. Wire drawing mechanism; 731. Third gear set; 732. Wire guide wheel set; 733. Wire drawing motor; 734. Connecting disc; 74. Straightening mechanism; 75. Support frame; 76. Welding wire; 8. Welding gun cover; 9. Tighten the nut. DETAILED DESCRIPTION

[0024] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0025] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0026] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it 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 an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0027] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0028] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0029] Combine the following Figures 1 to 9The TIG welding gun for all-position additive repair of the inner wall of a small-diameter threaded hole provided by an embodiment of the present invention is described in detail through specific embodiments and application scenarios.

[0030] In the embodiments of the invention, reference is made to Figures 1 to 3 A TIG welding gun 100 for all-position additive repair of the inner wall of a small-diameter threaded hole comprises a welding gun head 1, a radial sliding table 2, a rotary drive device 3 and an axial drive device 4. The radial sliding table 2 is connected to the welding gun head 1, and the radial sliding table 2 is suitable for driving the welding gun head 1 to move radially; the rotary drive device 3 is connected to the radial sliding table 2, and the rotary drive device 3 is suitable for driving the radial sliding table 2 to rotate along its own axial direction; the axial drive device 4 is connected to the rotary drive device 3, and the axial drive device 4 is suitable for driving the rotary device to move along its own axial direction.

[0031] The welding gun head 1 is a direct execution part of the welding operation, which is responsible for generating an arc to melt the welding wire 76 and the base material to achieve welding. In this solution, the welding gun head 1 is connected to the radial sliding table 2 and can move with the movement of the radial sliding table 2, thereby reaching different positions of the inner wall of the threaded hole.

[0032] The radial sliding table 2 is a movable mechanical structure, connected to the welding gun head 1, and can drive the welding gun head 1 to move in the radial direction (i.e., the direction perpendicular to the axis of the threaded hole), so that the welding gun head 1 can reach different radial positions of the inner wall of the threaded hole, meeting the needs of repairing various parts of the inner wall of the threaded hole.

[0033] The rotary drive device 3 is connected to the radial sliding table 2, and drives the radial sliding table 2 (and the welding gun head 1) to rotate along its own axis through its driving mechanism (such as a motor, a reducer, a transmission shaft, etc.), so that the welding gun head 1 can rotate 360° around the axis of the threaded hole, ensuring uniform welding repair of all positions of the inner wall of the threaded hole.

[0034] The axial drive device 4 is connected to the rotary drive device 3, and drives the rotary drive device 3 (and the radial slide table 2 and the welding gun head 1) to move along its own axial direction through its internal mechanical structure (such as motor, lead screw, guide rail, etc.), so that the welding gun head 1 can penetrate into different depths of the threaded hole and realize the repair operation of the full depth of the inner wall of the threaded hole.

[0035] In the present application, through the coordinated action of the radial sliding table 2, the rotary drive device 3 and the axial drive device 4, the welding gun head 1 can perform welding operations at any position of the inner wall of the threaded hole, thereby achieving comprehensive and accurate additive repair of the damaged area. Each component of the welding gun is designed as a movable component, which can be flexibly adjusted and positioned according to different welding requirements. This high flexibility ensures the accuracy and efficiency of the welding operation and improves the welding quality.

[0036] The present application sets a radial sliding table 2 connected to the welding gun head 1, and the radial sliding table 2 drives the welding gun head 1 to move radially; sets a rotary drive device 3 connected to the radial sliding table 2, and the rotary drive device 3 drives the radial sliding table 2 to rotate along its own axial direction; sets an axial drive device 4 connected to the rotary drive device 3, and the axial drive device 4 drives the rotary device to move along its own axial direction; wherein, the radial sliding table 2 realizes the radial movement of the welding gun head 1, the rotary drive device 3 realizes the rotary movement of the welding gun head 1, and the axial drive device 4 realizes the axial movement of the welding gun head 1, thereby effectively realizing the movement of the welding gun head 1 in multiple directions, so that it can perform additive repair operations on damaged areas at all positions on the inner wall of a small-diameter threaded hole, and has the ability to be used in more complex working conditions.

[0037] Reference Figures 1 to 4 In some embodiments, the welding gun head 1 has a connecting end and a welding end that are relatively arranged. The connecting end is connected to the radial sliding table 2. The welding end is provided with a tungsten electrode 11, a wire feeding hole 12 and a plurality of gas outlet holes 13. The plurality of gas outlet holes 13 are arranged around the circumference of the tungsten electrode 11. The wire feeding hole 12 is inclined toward the tungsten electrode 11. A gas channel 14 and a wire feeding pipe 15 are opened in the welding gun head 1 along its own axial direction. The gas channel 14 is connected to the gas outlet hole 13, and the wire feeding pipe 15 is connected to the wire feeding hole 12.

[0038] It is understandable that the welding gun head 1 uses a copper electrode rod, which has a connecting section and a welding end, and the connecting end is used to connect with the radial sliding table 2 to fix the welding gun head 1 and transmit power. The connecting end drives the welding gun head 1 to move radially through the radial sliding table 2, thereby adapting to the needs of repairing threaded holes of different diameters.

[0039] The welding end is the actual welding part of the welding gun head 1, which includes a tungsten electrode 11, a wire feeding hole 12 and a plurality of gas outlet holes 13. The tungsten electrode 11 can generate an arc and is a key component in the welding process. The wire feeding hole 12 is used to deliver the welding wire 76. The wire feeding hole 12 is tilted toward the tungsten electrode 11, which helps the welding wire 76 to be accurately delivered to the welding area and improves the welding accuracy. A plurality of gas outlet holes 13 are arranged around the circumference of the tungsten electrode 11 for delivering shielding gas to form a shielding gas barrier around the tungsten electrode 11 to prevent the welding area from being contaminated and improve the welding quality.

[0040] The gas channel 14 opened inside the welding gun head 1 along the axial direction thereof is used to deliver the shielding gas to the welding area. The wire feeding pipe 15 opened inside the welding gun head 1 along the axial direction thereof is used to deliver the welding wire 76 to the welding area. The gas channel 14 is connected with the gas outlet 13 to ensure that the shielding gas can be evenly ejected from the gas outlet 13 to form a protective layer; the wire feeding pipe 15 is connected with the wire feeding hole 12 to ensure that the welding wire 76 can be smoothly delivered to the welding area.

[0041] Reference Figures 1 to 4 In some embodiments, a gas-water distribution chamber 16 is provided at the end of the welding gun head 1 near the connection end, and the gas-water distribution chamber 16 is respectively connected to an external gas supply device and an external water cooling device to provide protective gas for the gas channel 14 and provide cooling for the welding gun head 1.

[0042] It can be understood that the air-water distribution chamber 16 is a component integrating air supply and cooling functions, and is connected to an external air supply device and an external water cooling device respectively.

[0043] The gas-water distribution chamber 16 can provide protective gas for the gas channel 14 inside the welding gun head 1 to ensure that the weld area is not contaminated during welding. At the same time, it provides cooling for the welding gun head 1 to prevent the welding gun from overheating due to high temperature, thereby extending the service life of the welding gun and ensuring welding quality.

[0044] The external gas supply device delivers shielding gas to the gas channel 14 inside the welding gun head 1 through the gas-water distribution chamber 16. The shielding gas is evenly distributed around the welding area through the gas outlet 13 on the welding gun head 1 to form a protective layer to prevent the weld area from being oxidized or contaminated by other impurities during welding.

[0045] The external water cooling device provides cooling water to the welding gun head 1 through the air-water distribution chamber 16. The cooling water enters the cooling water channel inside the welding gun head 1 through the water inlet groove 162, absorbs the heat generated by the welding gun during operation, and then is discharged through the water outlet groove 163, taking away the heat and keeping the welding gun within a safe operating temperature range.

[0046] Reference Figure 4In some embodiments, the gas-water distribution chamber 16 includes an air inlet groove 161, a water inlet groove 162, a water outlet groove 163 and a plurality of sealing grooves 164 provided along the outer peripheral wall of the welding gun head 1. The plurality of sealing grooves 164 are arranged alternately with the air inlet groove 161, the water inlet groove 162 and the water outlet groove 163. The air inlet groove 161 is connected to the gas channel 14 through the air inlet hole 161a. The water inlet groove 162 and the water outlet groove 163 are annular and connected to each other. The sealing groove 164 is suitable for installing a sealing ring 6 to seal and space the air inlet groove 161, the water inlet groove 162 and the water outlet groove 163. The TIG welding gun 100 for full-position additive repair of the inner wall of a small-diameter threaded hole also includes an air-water distribution sleeve 5, which is disposed on the outer side of the air-water distribution chamber 16. The inner wall surface of the air-water distribution sleeve 5 abuts against the plurality of sealing rings 6. The two ends of the air-water distribution sleeve 5 along the axial direction are rotatably connected to the welding gun head 1 through bearings 201.

[0047] Specifically, the gas-water distribution chamber 16 of the welding gun head 1 includes a gas-water distribution structure and a sealing groove 164, a gas-water distribution sleeve 5, a sealing ring 6 and a bearing 201 provided on the outer surface of the welding gun head 1; the gas-water distribution structure of the welding gun head 1 is an air inlet groove 161, a water inlet groove 162 and a water outlet groove 163 provided on the outer surface of the welding gun head 1; the sealing groove 164 is respectively provided between and at both ends of the air inlet groove 161, the water inlet groove 162 and the water outlet groove 163; the sealing ring 6 is provided in the sealing groove 164; the gas-water distribution sleeve 5 is sleeved on the gas-water distribution structure of the welding gun head 1, and its front and rear ends are rotatably connected to the welding gun head 1 through the bearing 201, so that the gas-water distribution sleeve 5 will not rotate with the welding gun head 1, and the middle section of the gas-water distribution sleeve 5 is connected to the sealing ring 6 and the welding gun head 1, so that the gas inlet groove 161, the water inlet groove 162 and the water outlet groove 163 are isolated and sealed from each other; The air inlet groove 161 is provided with an air inlet hole 161a connected to the gas channel 14 of the welding gun head 1; the end of the gas channel 14 away from the tungsten electrode 11 is provided with a sealing set screw 202 to achieve the sealing of the end of the gas channel 14 away from the tungsten electrode 11; the gas-water distribution sleeve 5 is provided with an air inlet pipe 53 at the corresponding position of the air inlet groove 161, so that the protective gas is transported by an external gas supply device through the air inlet pipe 53, the air inlet groove 161, the air inlet hole 161a, the gas channel 14, and the air outlet hole 13 to the welding area at the tungsten electrode 11. The air-water distribution sleeve 5 is provided with a connecting channel 54 at the corresponding positions of the water inlet groove 162 and the water outlet groove 163; the air-water distribution sleeve 5 is respectively provided with a water inlet pipe 51 and a water outlet pipe 52 at the corresponding positions of the water inlet groove 162 and the water outlet groove 163, so that the cooling water is transported by the external water cooling device and passes through the water inlet pipe 51, the water inlet groove 162, the connecting channel 54, the water outlet groove 163, the water outlet pipe 52 in sequence and then returns to the external water cooling device.

[0048] Reference Figure 3 and Figure 4In some embodiments, the TIG welding gun 100 for all-position additive repair of the inner wall of a small-diameter threaded hole further includes a conductive ear 18, an insulating sliding sleeve, and an annular conductive block 20. One side of the conductive ear 18 is rotatably connected to the welding gun head 1 through the insulating sliding sleeve, and the other side opposite to the conductive ear 18 is electrically connected to the welding gun head 1 through the annular conductive block 20.

[0049] Specifically, an insulating sliding sleeve is provided between the conductive ear 18 and the welding gun head 1, and the conductive ear 18 is connected to the welding gun head 1 through the insulating sliding sleeve, so that the conductive ear 18 will not rotate with the welding gun head 1 to avoid the tube body from being entangled. An annular conductive block 20 is provided on the side of the conductive ear 18 that is not in contact with the insulating sliding sleeve, so that the external power source of electric energy is transmitted to the tungsten electrode 11 after passing through the wiring terminal 181, the conductive ear 18, the annular conductive block 20 and the copper electrode rod in sequence. The annular conductive block 20 is connected to the copper electrode rod through a set screw 202.

[0050] Reference Figure 2 and Figure 5 In some embodiments, the radial sliding table 2 includes a slide 21, a radial slider 23, a radial screw 24 and a radial motor 22. The slide 21 is connected to the rotation drive device 3, the radial screw 24 is installed on the slide 21 and extends radially, the radial slider 23 is connected to the welding gun head 1, and the radial slider 23 is connected to the radial screw 24. The radial motor 22 is used to drive the radial slider 23 to move reciprocatingly on the radial screw 24.

[0051] Specifically, the radial sliding table 2 includes a slide 21, a radial motor 22, a first gear set 25, a radial slider 23, a radial guide rod 26 and a radial screw 24. The radial motor 22 is connected to the radial screw 24 through the first gear set 25. The radial slider 23 is connected to the radial screw 24 and the radial guide rod 26. There are two radial limit switches 27, which are respectively arranged on both sides of the maximum stroke of the radial slider 23 on the radial screw 24 and the radial guide rod 26. The radial motor 22, the first gear set 25, the radial slider 23, the radial guide rod 26 and the radial screw 24 are all installed on the slide 21. The radial slider 23 is connected to the electrode mounting seat 203 of the welding gun head 1 to realize the radial movement of the welding gun head 1.

[0052] Reference Figure 2 and Figure 6 In some embodiments, the rotary drive device 3 includes a rotary motor 32, a hollow shaft 34, a second gear set 33 and a gear box 31. The rotary motor 32, the hollow shaft 34 and the second gear set 33 are installed on the gear box 31. The rotary motor 32 is connected to the hollow shaft 34 through the second gear set 33, and the hollow shaft 34 is connected to the radial sliding table 2.

[0053] Specifically, the rotary drive device 3 includes a rotary motor 32, a second gear set 33, a hollow shaft 34 and a gear box 31. The rotary motor 32 is connected to the hollow shaft 34 through the second gear set 33, and the hollow shaft 34 is connected to the electric slip ring 35 through the positioning sleeve 37, which can avoid the problem of the electric wires of the rotary motor 32 being entangled. The electric slip ring 35 is connected to the gear box 31 through one or more positioning ears 36 to achieve positioning. The rotary motor 32, the second gear set 33, and the hollow shaft 34 are all installed on the gear box 31. The hollow shaft 34 is connected to the slide seat 21 of the radial sliding table 2 to realize the rotational movement of the radial sliding table 2, thereby driving the welding gun head 1 to achieve rotational movement.

[0054] Reference Figure 2 and Fig. 9 In some embodiments, the axial drive device 4 includes a housing 41, an axial motor 42, an axial slider 43, a linear bearing 48201 and an axial screw 44. The axial motor 42, the axial slider 43, the linear bearing 48201 and the axial screw 44 are installed on the housing 41. The axial screw 44 is extended along the axis. The axial slider 43 is connected to the rotation drive device 3. The axial slider 43 and the axial screw 44 are slidably matched. The axial motor 42 is drivingly connected to the axial screw 44. The axial motor 42 is suitable for driving the axial screw 44 to rotate, so as to drive the axial slider 43 to reciprocate on the axial screw 44.

[0055] Specifically, the axial drive device 4 includes a housing 41, an axial motor 42, a conveyor belt set 47, an axial slider 43, a linear bearing 48201, an axial guide rod 45 and an axial screw 44. The axial motor 42 is connected to the axial screw 44 through the conveyor belt set 47; the axial slider 43 is connected to the axial screw 44, and is connected to the axial guide rod 45 through the linear bearing 48201. There are two axial limit switches 46, which are respectively arranged on both sides of the maximum stroke of the axial slider 43 on the axial screw 44 and the axial guide rod 45. The axial motor 42, the conveyor belt set 47, the axial slider 43, the axial guide rod 45 and the axial screw 44 are all installed on the housing 41. The axial slider 43 is connected to the gear box 31 of the rotary drive device 3 to realize the axial movement of the rotary drive device 3, thereby driving the radial sliding table 2 and the welding gun head 1 to realize axial movement.

[0056] Reference Figure 7 and Figure 8 In some embodiments, the TIG welding gun 100 for all-position additive repair of the inner wall of a small-diameter threaded hole also includes a wire feeding device 7, which includes a wire feeding reel 71, a connecting bracket 72, a wire drawing mechanism 73, a straightening mechanism 74 and a support frame 75. The support frame 75 is connected between the wire drawing mechanism 73 and the rotary drive device 3. The wire drawing mechanism 73 is connected to the wire feeding reel 71 through a connection, and the straightening mechanism 74 is arranged between the wire feeding reel 71 and the wire drawing mechanism 73.

[0057] Specifically, the wire feeding device 7 includes a wire feeding disc 71, a connecting bracket 72, a wire drawing mechanism 73, a straightening mechanism 74 and a supporting frame 75. Among them, the wire drawing mechanism 73 includes a wire drawing box, a third gear set 731, a wire guide wheel set 732, a wire drawing motor 733 and a connecting disc 734. The wire drawing motor 733 is connected to the wire guide wheel set 732 through the third gear set 731 to realize the wire feeding movement of the welding wire 76 driven by the rotation of the wire guide wheel. The third gear set 731 and the wire guide wheel set 732 are both installed in the wire drawing box. The wire drawing mechanism 73 is connected to the rotary drive device 3 through the supporting frame 75, the wire drawing mechanism 73 is connected to the straightening mechanism 74 through the connecting disc 734, and the wire drawing mechanism 73 is connected to the wire feeding disc 71 through the connecting bracket 72. The welding wire 76 on the welding wire reel 76 passes through the straightening mechanism 74 and the wire drawing mechanism 73 of the wire feeding device 7, the hollow shaft 34 of the rotary drive device 3, the radial slider 23 of the radial sliding table 2, the wire feeding pipe 15 and the wire guide nozzle 17 of the welding gun head 1, and then is delivered to the welding area near the tungsten electrode 11.

[0058] Reference Figure 4 In some embodiments, a wire guide nozzle 17 connected to the wire feeding pipe 15 is provided at the wire feeding hole 12; an electrode mounting seat 203 is provided on the side of the gas-water distribution sleeve 5 away from the conductive ear 18; the electrode mounting seat 203 is positioned by a positioning set screw 202 and connected to the copper electrode rod. A compression spring and a compression nut 9 are provided on the insulating sliding sleeve.

[0059] The TIG welding gun 100 of the present invention for all-position additive repair of the inner wall of a small-diameter threaded hole can realize repair operations in threaded holes with a diameter greater than or equal to 24 mm, and the operating depth can reach 190 mm. By changing the axial and radial positions of the welding gun head 1, operations can be performed on threaded holes of different diameters and depths, and the device has good operational applicability.

[0060] The TIG welding gun 100 for all-position additive repair of the inner wall of a small-diameter threaded hole further comprises a hollow welding gun cover 8. The welding gun cover 8 is connected to the gear box 31. The welding gun head 1, the radial sliding table 2, and the rotary drive device 3 are located in the welding gun cover 8.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A TIG welding gun for all-position additive repair of the inner wall of a small-diameter threaded hole, characterized in that: include: Welding gun tip; A radial sliding platform, the radial sliding platform is connected to the welding gun head, and the radial sliding platform is suitable for driving the welding gun head to move radially; A rotation driving device, the rotation driving device is connected to the radial sliding table, and the rotation driving device is suitable for driving the radial sliding table to rotate along its own axis direction; An axial driving device is connected to the rotary driving device, and the axial driving device is suitable for driving the rotary device to move along its own axial direction.

2. The TIG welding gun for all-position additive repair of the inner wall of a small-diameter threaded hole according to claim 1 is characterized in that: The welding gun head has a connecting end and a welding end that are relatively arranged. The connecting end is connected to the radial sliding table. The welding end is provided with a tungsten electrode, a wire feeding hole and a plurality of gas outlet holes. The plurality of gas outlet holes are arranged in a ring around the tungsten electrode. The wire feeding hole is inclined toward the tungsten electrode. A gas channel and a wire feeding pipeline are opened in the welding gun head along its own axial direction. The gas channel is connected to the gas outlet hole, and the wire feeding pipeline is connected to the wire feeding hole.

3. The TIG welding gun for all-position additive repair of the inner wall of a small-diameter threaded hole according to claim 2 is characterized in that: An air-water distribution chamber is provided at the end of the welding gun head close to the connection end, and the air-water distribution chamber is respectively connected to an external air supply device and an external water cooling device to provide protective gas for the gas channel and provide cooling for the welding gun head.

4. The TIG welding gun for all-position additive repair of the inner wall of a small-diameter threaded hole according to claim 3 is characterized in that: The gas-water distribution chamber includes an air inlet groove, a water inlet groove, a water outlet groove and a plurality of sealing grooves which are provided along the outer peripheral wall of the welding gun head. The plurality of sealing grooves are alternately arranged with the air inlet groove, the water inlet groove and the water outlet groove. The air inlet groove is connected with the gas channel through an air inlet hole. The water inlet groove and the water outlet groove are annular and connected to each other. The sealing groove is suitable for installing a sealing ring to seal and space the air inlet groove, the water inlet groove and the water outlet groove.

5. The TIG welding gun for all-position additive repair of the inner wall of a small-diameter threaded hole according to claim 4, characterized in that: The TIG welding gun used for all-position additive repair of the inner wall of a small-diameter threaded hole also includes an air-water distribution sleeve, which is arranged on the outside of the air-water distribution chamber, and the inner wall surface of the air-water distribution sleeve abuts against the multiple sealing rings, and the two ends of the air-water distribution sleeve along the axial direction are rotatably connected to the welding gun head through bearings.

6. The TIG welding gun for all-position additive repair of the inner wall of a small-diameter threaded hole according to any one of claims 1 to 5, characterized in that: The TIG welding gun used for all-position additive repair of the inner wall of a small-diameter threaded hole also includes a conductive ear, an insulating sliding sleeve and an annular conductive block. One side of the conductive ear is rotatably connected to the welding gun head through the insulating sliding sleeve, and the other side opposite to the conductive ear is electrically connected to the welding gun head through the annular conductive block.

7. The TIG welding gun for all-position additive repair of the inner wall of a small-diameter threaded hole according to any one of claims 1 to 5, characterized in that: The radial sliding table includes a sliding seat, a radial slider, a radial screw and a radial motor, the sliding seat is connected to the rotation drive device, the radial screw is installed on the sliding seat and extends radially, the radial slider is connected to the welding gun head, and the radial slider is connected to the radial screw, and the radial motor is used to drive the radial slider to reciprocate on the radial screw.

8. The TIG welding gun for all-position additive repair of the inner wall of a small-diameter threaded hole according to any one of claims 1 to 5, characterized in that: The rotary drive device includes a rotary motor, a hollow shaft, a second gear set and a gear box body. The rotary motor, the hollow shaft and the second gear set are installed on the gear box body. The rotary motor is connected to the hollow shaft through the second gear set, and the hollow shaft is connected to the radial sliding table.

9. The TIG welding gun for all-position additive repair of the inner wall of a small-diameter threaded hole according to any one of claims 1 to 5, characterized in that: The axial drive device includes a housing, an axial motor, an axial slider and an axial screw. The axial motor, the axial slider and the axial screw are installed on the housing. The axial screw is extended along the axis. The axial slider is connected to the rotary drive device. The axial slider is slidably matched with the axial screw. The axial motor is drivingly connected to the axial screw. The axial motor is suitable for driving the axial screw to rotate so as to drive the axial slider to reciprocate on the axial screw.

10. The TIG welding gun for all-position additive repair of the inner wall of a small-diameter threaded hole according to any one of claims 1 to 5, characterized in that: The TIG welding gun for all-position additive repair of the inner wall of a small-diameter threaded hole also includes a wire feeding device, which includes a wire feeding reel, a connecting bracket, a wire drawing mechanism, a straightening mechanism and a support frame. The support frame is connected between the wire drawing mechanism and the rotary drive device, the wire drawing mechanism is connected to the wire feeding reel through the connecting bracket, and the straightening mechanism is arranged between the wire feeding reel and the wire drawing mechanism.

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