A high-precision plasma arc welding machine and an automatic wire feeding device thereof

Abstract

The application relates to the technical field of arc welding machines, and discloses a high-precision plasma arc welding machine and an automatic wire feeding device thereof, wherein the high-precision plasma arc welding machine comprises an arc welding machine base, a portal frame is arranged at the top of the arc welding machine base, two moving seats are symmetrically arranged at the top of the arc welding machine base, an extension cylinder is arranged on the portal frame, a welding torch is arranged at the output end of the extension cylinder, a rotating ring is arranged on the inner side of the moving seat, a thin pipe body is inserted into the inner side of the rotating ring, and a spraying liquid suction unit arranged in the thin pipe body is further arranged. The high-precision plasma arc welding machine adopts a mode of directly spraying cooling liquid on the inner wall of the thin pipe. The cooling liquid directly acts on the back of a weld and a near-weld area, can instantaneously take away a large amount of heat generated during welding, significantly reduces a heat input peak value, simultaneously greatly reduces the range of a heat affected zone, effectively inhibits axial wave deformation and roundness loss caused by thermal expansion and cold contraction, and avoids the generation of harmful oxide skins caused by high-temperature oxidation of the inner wall.

Description

Technical Field

[0001] This invention relates to the field of arc welding machine technology, and in particular to a high-precision plasma arc welding machine and its automatic wire feeding device. Background Technology

[0002] High-precision plasma arc welding machines are precision welding devices that utilize the "compression effect" to confine a conventional electric arc into a high-temperature, high-energy-density plasma beam. Through the triple action of mechanical compression of the nozzle, thermal compression of the gas flow, and magnetic compression of the current, the arc cross-section is drastically reduced, and the temperature rises to 15,000-30,000 K, with an energy density more than 10 times higher than that of conventional arc welding. However, existing arc welding machines still have the following drawbacks in use: Existing conventional arc welding machines commonly suffer from wavy deformation and burn-through defects caused by uneven heat input when welding thin-walled tubes. This has become a core technical bottleneck restricting the welding quality and production efficiency of thin-walled tubes. Thin-walled tubes are characterized by low heat capacity and low rigidity, making them extremely sensitive to welding heat input. When the local heat input is too high, that area of ​​the thin-walled tube will instantly exceed the melting temperature, forming a through-hole.

[0003] More commonly, wavy deformation is a problem. During welding, the metal in the weld seam and near-weld zone expands due to heat, but is rigidly constrained by the surrounding unheated, cold metal, resulting in compressive plastic deformation. Upon cooling, this portion of metal cannot contract freely, creating residual tensile and compressive stresses inside the thin tube. When the compressive stress exceeds the critical buckling stress of the thin tube, irregular wavy warping deformation occurs. These defects not only severely affect the product's appearance quality and dimensional accuracy but also significantly increase the cost of subsequent straightening and repair processes, reduce production efficiency, and weaken the mechanical and sealing properties of the welded joint. This is particularly prominent in industries where thin tubes are widely used, such as automotive, home appliances, and electronics. Summary of the Invention

[0004] In view of the problems of wavy deformation and burn-through that easily occur when welding thin tubes in the existing technology, a high-precision plasma arc welding machine and its automatic wire feeding device are proposed.

[0005] This application provides a high-precision plasma arc welding machine, the purpose of which is to solve the defects of wave deformation and burn-through that occur during the welding of thin tubes, and to improve the welding quality of thin tubes.

[0006] The technical solution of the present invention is as follows: a high-precision plasma arc welding machine, including an arc welding machine base, a gantry frame is provided on the top of the arc welding machine base, two movable seats are symmetrically distributed on the top of the arc welding machine base, a telescopic cylinder is provided on the gantry frame, a welding gun is provided at the output end of the telescopic cylinder, a rotating ring is provided on the inner side of the movable seat, a thin tube body is inserted into the inner side of the rotating ring, and a spraying and liquid absorption unit is provided in the thin tube body. The spraying and liquid absorption unit includes a spraying component and a liquid absorption component disposed within the thin tube body. The spraying component includes a shrinking component disposed within the thin tube body, and a driving component and a spraying component are disposed on the shrinking component. The spraying component is used to spray coolant into the thin tube body, and the liquid suction component is used to absorb and remove the sprayed coolant. The expansion assembly includes cylinders respectively disposed inside two thin tube bodies. Several through slots are arranged in a circular array on the cylinders. Two connecting rods are symmetrically distributed inside the through slots. An expansion seat is disposed at the end of the two connecting rods away from the cylinder. A roller is disposed on the expansion seat and is in rolling connection with the inner wall of the thin tube body.

[0007] Furthermore, the drive assembly includes a bidirectional threaded rod disposed inside the cylinder, with two nuts symmetrically distributed on the bidirectional threaded rod. The connecting rod is rotatably connected to the nuts at one end near the bidirectional threaded rod. A second motor is also disposed on the cylinder, and the output shaft of the second motor is fixedly connected to the bidirectional threaded rod.

[0008] Furthermore, the spraying assembly includes a spraying cylinder mounted on one of the cylinders, a mounting plate at the end of the spraying cylinder away from the cylinder, a through hole at the top of the end of the spraying cylinder near the mounting plate, a plurality of nozzles arranged in a ring array on the mounting plate, and a connecting pipe on the spraying cylinder, the end of the connecting pipe away from the spraying cylinder extending to the outside of the thin tube body.

[0009] Furthermore, the spraying component also includes a pressure component and a pusher component disposed on the spraying assembly; The pressure assembly includes a central rod disposed inside the spray cylinder, the central rod being fixedly connected to a mounting circular plate, a pressure plate disposed on the central rod, the pressure plate being slidably connected to the spray cylinder with a limiting seal, a movable plate disposed on the pressure plate, the movable plate being slidably connected to the central rod, and a pressure spring disposed between the movable plate and the inner wall of the spray cylinder, the pressure spring being sleeved on the central rod.

[0010] Furthermore, the push-turn assembly includes several inclined slots arranged in a circular array on the central rod, and several straight slots arranged in a circular array on the central rod. The straight slots connect two adjacent inclined slots, and a push block is provided on the inner side of both the inclined slots and the straight slots. The push block is fixedly connected to the moving plate.

[0011] Furthermore, the liquid suction component includes a liquid suction assembly and an adhesion assembly disposed inside the thin tube body, and a pushing assembly is disposed outside the moving seat; The liquid aspiration assembly includes a liquid aspiration box mounted on another cylinder, a sealing plate inside the liquid aspiration box, a first electric actuator on the top of the liquid aspiration box, the output end of the first electric actuator being fixedly connected to the sealing plate, and a liquid aspiration tube on one side of the bottom of the liquid aspiration box.

[0012] Furthermore, the bonding assembly includes a bonding tube disposed inside the suction tube, a counterweight ring disposed outside the bonding tube, and a number of ball bearings arranged in a circular array on the bonding tube, the ball bearings being rolledly connected to the inner wall of the thin tube body.

[0013] Furthermore, the pushing component includes a U-shaped plate disposed on the movable base, a second electric push rod disposed on the U-shaped plate, and the output end of the second electric push rod being fixedly connected to the cylinder.

[0014] Furthermore, it also includes a clamping assembly, which includes two symmetrically distributed grooves on the arc welding machine base. A clamping rod is provided inside the groove, and a slider is provided on the clamping rod. The slider is fixedly connected to the corresponding movable seat and slidably connected to the inside of the groove. A clamping spring is provided between the slider and the inner wall of the groove, and the clamping spring is sleeved on the clamping rod.

[0015] Another objective of this invention is to provide a high-precision automatic wire feeding device for a plasma arc welding machine, which aims to: deliver the welding wire to the welding torch contact tip at a uniform speed and stably, maintain the continuous stability of the welding arc, ensure the quality of weld formation, and improve the degree of automation and efficiency of welding.

[0016] To achieve the above objectives, the present invention provides the following technical solution: an automatic wire feeding device for a high-precision plasma arc welding machine, comprising a housing mounted on a telescopic cylinder, a roller mounted inside the housing, a first motor mounted outside the housing, the output shaft of the first motor being fixedly connected to the roller shaft, a soft sleeve mounted on the telescopic cylinder, welding wire mounted inside the soft sleeve, and the top of the welding wire being wound around the outside of the roller.

[0017] The beneficial effects of this invention are: By directly spraying coolant onto the inner wall of the thin-walled pipe, the coolant acts directly on the back of the weld and the near-weld area, instantly removing a large amount of heat generated during welding. This significantly reduces the peak heat input and avoids burn-through defects in ultra-thin 0.3-2mm pipes. Simultaneously, it greatly reduces the heat-affected zone, effectively suppressing axial wave deformation and roundness loss caused by thermal expansion and contraction, preventing the formation of harmful oxide scale from high-temperature oxidation of the inner wall, and significantly improving the cleanliness and corrosion resistance of the pipe's interior, eliminating the need for subsequent acid pickling.

[0018] A negative pressure is generated by driving a sealing plate with an electric actuator. This, combined with a self-adhesive suction tube with a counterweight ring, allows for precise insertion below the liquid surface at the bottom of the thin tube, completely removing the sprayed coolant. This solves the problem of residual coolant vaporizing at high temperatures, leading to porosity and hydrogen embrittlement in the weld, and avoids corrosion of the pipe wall caused by long-term coolant retention. The suction process is performed simultaneously with welding; after welding, there is no liquid residue inside the tube, allowing it to proceed directly to the next processing step, significantly improving production continuity.

[0019] The automatic nozzle switching mechanism, driven by mechanical hydraulics, automatically switches to a backup nozzle when a single nozzle becomes clogged due to impurities, splashes, or scale. The increased pressure inside the spray cylinder pushes a moving plate, which in turn rotates the central rod 90° via a sloping groove structure. The entire process requires no manual intervention or electrical control, solving the problems of cooling interruption and reduced welding quality caused by nozzle clogging in traditional systems. Suitable for automated mass production scenarios, it significantly reduces equipment downtime for maintenance and substantially improves welding production efficiency. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the high-precision plasma arc welding machine of the present invention; Figure 2 This is a three-dimensional structural diagram of the high-precision plasma arc welding machine of the present invention without the arc welding machine base; Figure 3 This is a schematic diagram of the high-precision plasma arc welding machine spraying and liquid absorption unit structure of the present invention; Figure 4 This is a cross-sectional view of the spraying and liquid absorption unit of the high-precision plasma arc welding machine of the present invention; Figure 5 This is a schematic diagram of the expansion assembly structure of the high-precision plasma arc welding machine of the present invention; Figure 6 This is a schematic diagram of the spraying component structure of the high-precision plasma arc welding machine of the present invention; Figure 7 This is a cross-sectional structural schematic diagram of the spraying component of the high-precision plasma arc welding machine of the present invention; Figure 8 This is a schematic diagram of the pressure component structure of the high-precision plasma arc welding machine of the present invention; Figure 9 This is a schematic diagram of the high-precision plasma arc welding machine push-rotor assembly structure of the present invention; Figure 10 The high-precision plasma arc welding machine of the present invention Figure 9 Enlarged structural diagram at point A in the middle; Figure 11 This is a schematic diagram of the liquid suction assembly of the high-precision plasma arc welding machine of the present invention; Figure 12 This is a cross-sectional view of the liquid suction assembly of the high-precision plasma arc welding machine of the present invention; Figure 13 This is a schematic diagram of the bonding component structure of the high-precision plasma arc welding machine of the present invention.

[0021] In the picture: 1. Arc welding machine base; 11. Gantry frame; 12. Moving base; 13. Telescopic cylinder; 14. Welding torch; 15. Rotating ring; 16. Thin tube body; 17. Housing; 18. First motor; 19. Soft sleeve; 111. Welding wire; 2. Tensioning assembly; 21. Cylinder; 22. Connecting rod; 23. Tensioning seat; 24. Roller; 3. Drive assembly; 31. Bidirectional threaded rod; 32. Nut; 33. Second motor; 4. Spraying assembly; 41. Spraying cylinder; 42. Mounting circular plate; 43. Through hole; 44. Nozzle; 45. Connecting pipe; 5. Pressure assembly; 51. Center rod; 52. Pressure plate; 53. Moving plate; 54. Pressure spring; 6. Push-rotate assembly; 61. Inclined groove; 62. Straight groove; 63. Push block; 7. Liquid suction assembly; 71. Liquid suction box; 72. Sealing plate; 73. First electric push rod; 74. Liquid suction tube; 8. Adhesion assembly; 81. Adhesion tube; 82. Counterweight ring; 83. Ball bearing; 9. Pushing assembly; 91. U-shaped plate; 92. Second electric push rod; 10. Clamping assembly; 101. Clamping rod; 102. Slider; 103. Clamping spring. Detailed Implementation

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0023] Example 1, referring to Figures 1-7 This invention provides a high-precision plasma arc welding machine, comprising an arc welding machine base 1, a gantry frame 11 fixedly connected to the top of the arc welding machine base 1, and two symmetrically distributed sliding seats 12 slidably connected to the top of the arc welding machine base 1. A telescopic cylinder 13 is slidably connected to the gantry frame 11, and a welding torch 14 is fixedly connected to the output end of the telescopic cylinder 13. A rotating ring 15 is rotatably connected to the inner side of the sliding seat 12, and a thin tube body 16 is inserted into the inner side of the rotating ring 15. The machine also includes a spraying and suction unit installed within the thin tube body 16. The spraying and suction unit includes a spraying component and a suction component installed within the thin tube body 16. The spraying component includes a... The expansion and tightening assembly 2 is installed inside the thin tube body 16. The expansion and tightening assembly 2 is equipped with a drive assembly 3 and a spraying assembly 4. The spraying component is used to spray coolant into the thin tube body 16, and the liquid suction component is used to absorb and remove the sprayed coolant. The expansion and tightening assembly 2 includes cylinders 21 respectively inserted into two thin tube bodies 16. Several through slots are distributed in a ring array on the cylinders 21. Two connecting rods 22 are symmetrically distributed and movably connected inside the through slots. The ends of the two connecting rods 22 away from the cylinders 21 are rotatably connected to an expansion seat 23. A roller 24 is rotatably connected to the expansion seat 23. The roller 24 is in rolling connection with the inner wall of the thin tube body 16.

[0024] Specifically, the movable seat 12 is slidable on the top of the arc welding machine base 1, inserting one of the thin tube bodies 16 into the inner side of the corresponding movable seat 12. The outer wall of the thin tube body 16 will fit against the inner wall of the rotating ring 15. In the same way, the other thin tube body 16 is inserted into the inner side of the corresponding movable seat 12. The two movable seats 12 will move relative to each other, causing the thin tube bodies 16 to move relative to each other, so that the two thin tube bodies 16 are spliced ​​together. The connecting rod 22 moves inside the through groove, causing the expanding seat 23 to move towards the inner wall of the thin tube body 16, causing the roller 24 to move, so that the roller 24 abuts against the inner wall of the thin tube body 16, expanding and fixing the thin tube body 16. Through an external drive motor with gears and a gear ring, the rotating ring 15 is driven to rotate, causing the thin tube body 16 to rotate. The telescopic cylinder 13 is activated, driving the welding torch 14 to move towards the thin tube body 16, turning on the welding torch 14, and welding the two thin tube bodies 16. Coolant is sprayed onto the inner wall of the thin-walled tube body 16 using a spraying component. The coolant directly and quickly removes heat from the weld and near-weld zone, significantly reducing peak heat input and preventing burn-through of the thin-walled tube at its source. Simultaneously, it greatly reduces the heat-affected zone, suppressing axial wave deformation and roundness loss caused by thermal expansion and contraction. It also prevents the formation of harmful oxide scale from high-temperature oxidation of the inner wall, improving the cleanliness and corrosion resistance of the pipe's interior. Furthermore, the liquid-absorbing component absorbs the sprayed coolant, quickly removing residual coolant from the inner wall of the thin-walled tube, preventing porosity and hydrogen embrittlement defects in the weld, avoiding corrosion of the inner wall, keeping the workpiece dry, and ensuring welding quality and smooth subsequent processing.

[0025] Reference Figure 4 and Figure 5 The drive assembly 3 includes a bidirectional threaded rod 31 rotatably connected to the inner side of the cylinder 21. Two nuts 32 are symmetrically threaded on the bidirectional threaded rod 31. The end of the connecting rod 22 near the bidirectional threaded rod 31 is rotatably connected to the nuts 32. A second motor 33 is also fixedly connected to the cylinder 21. The output shaft of the second motor 33 is fixedly connected to the bidirectional threaded rod 31.

[0026] Specifically, the second motor 33 is started, which drives the bidirectional threaded rod 31 to rotate, causing the connecting rod 22 to move inside the through groove, and the nut 32 to slide on the bidirectional threaded rod 31, which facilitates the adjustment of the connecting rod 22, so that the roller 24 abuts against the inner wall of the thin tube body 16.

[0027] Reference Figure 6 and Figure 7 The spraying assembly 4 includes a spraying cylinder 41 fixedly connected to one of the cylinders 21. A mounting plate 42 is rotatably connected to the end of the spraying cylinder 41 away from the cylinder 21. A through hole 43 is opened at the top of the end of the spraying cylinder 41 near the mounting plate 42. Several nozzles 44 are fixedly connected to the mounting plate 42 in a ring array. A connecting pipe 45 is fixedly connected to the spraying cylinder 41. The end of the connecting pipe 45 away from the spraying cylinder 41 extends to the outside of the thin tube body 16.

[0028] Specifically, the external coolant outlet is connected to the connecting pipe 45, allowing the coolant to enter the spray nozzle 41 and then through the through hole 43 into the corresponding nozzle 44. The coolant is then sprayed out from the nozzle 44 to cool the welding area of ​​the thin-walled tube body 16. Simultaneously, the mounting plate 42 can rotate. Due to the small aperture of the nozzle 44, impurities and metal splashes in the coolant easily accumulate, and with prolonged use, cooling water vaporizes and forms scale, easily clogging the nozzle 44. When the mounting plate 42 rotates, it drives the nozzle 44 to rotate, dislodging clogged nozzles and bringing in new ones, thus switching between old and new nozzles 44 to ensure a continuous and normal spraying of coolant.

[0029] Example 2, refer to Figures 7-10 This is the second embodiment of the present invention, which differs from the first embodiment in that: the spraying component further includes a pressure component 5 and a push-rotate component 6 installed on the spraying assembly 4; the pressure component 5 includes a central rod 51 rotatably connected to the inner side of the spraying cylinder 41, the central rod 51 being fixedly connected to the mounting circular plate 42, a pressure plate 52 being slidably connected to the central rod 51, the pressure plate 52 being slidably connected to the spraying cylinder 41 for limiting and sealing, a moving plate 53 being fixedly connected to the pressure plate 52, the moving plate 53 being slidably connected to the central rod 51, and a pressure spring 54 being fixedly connected between the moving plate 53 and the inner wall of the spraying cylinder 41, the pressure spring 54 being sleeved on the central rod 51.

[0030] Specifically, when the nozzle 44 spraying coolant is blocked, external coolant continuously enters the spray cylinder 41, and the coolant in the spray cylinder 41 cannot be sprayed out from the nozzle 44, causing the pressure inside the spray cylinder 41 to increase. This pushes the pressure plate 52 to slide on the central rod 51, causing the moving plate 53 to move and compress the pressure spring 54. The central rod 51 and the spray cylinder 41 are rotatably connected by a bearing seal, causing the central rod 51 to rotate 90 degrees. This causes the new nozzle 44 to rotate to the top of the spray cylinder 41, and the old nozzle 44 to rotate to the side of the spray cylinder 41, thus allowing the coolant to spray out normally again. This causes the pressure inside the spray cylinder 41 to gradually decrease. Under the action of the pressure spring 54, the moving plate 53 is pushed back to its original position, causing the pressure plate 52 to reset.

[0031] Reference Figure 9 and Figure 10 The push-turn assembly 6 includes several inclined slots 61 arranged in a ring array on the central rod 51. Several straight slots 62 are also arranged in a ring array on the central rod 51. The straight slots 62 connect two adjacent inclined slots 61. A push block 63 is provided on the inner side of the inclined slots 61 and the straight slots 62. The push block 63 is fixedly connected to the moving plate 53.

[0032] Specifically, the moving plate 53 moves, causing the pushing block 63 to move, so that the pushing block 63 slides in the inclined groove 61. One-way rubber wedges are provided at the connection points of the straight groove 62 and the two adjacent inclined grooves 61. Under the action of the inclined groove 61, the central rod 51 rotates, so that the pushing block 63 slides from the inside of the inclined groove 61 into the inside of the straight groove 62 under the action of the one-way rubber wedges. The moving plate 53 resets, and under the action of the one-way rubber wedges, it drives the pushing block 63 to move in the straight groove 62. The central rod 51 remains stationary. At this time, the switching of the old and new nozzles 44 has been completed.

[0033] Reference Figures 11-13 The liquid aspiration component includes a liquid aspiration assembly 7 and a bonding assembly 8 installed inside the thin tube body 16, and a pushing assembly 9 installed on the outside of the moving seat 12; the liquid aspiration assembly 7 includes a liquid aspiration box 71 fixedly connected to another cylinder 21, a sealing plate 72 slidably connected to the inside of the liquid aspiration box 71, a first electric push rod 73 fixedly connected to the top of the liquid aspiration box 71, the output end of the first electric push rod 73 fixedly connected to the sealing plate 72, and a liquid aspiration tube 74 fixedly connected to one side of the bottom of the liquid aspiration box 71.

[0034] Specifically, when coolant is sprayed into the thin tube body 16, the first electric actuator 73 is activated, causing the sealing plate 72 to slide inside the suction box 71, thus creating suction in the suction pipe 74 to absorb the coolant inside the thin tube body 16. After the thin tube body 16 is welded, the first electric actuator 73 is activated again, causing the sealing plate 72 to descend and discharge the coolant from the suction box 71 through the suction pipe 74, ready for the next coolant absorption.

[0035] Reference Figure 12 and Figure 13 The bonding component 8 includes a bonding tube 81 that is slidably connected to the inside of the suction tube 74. A counterweight ring 82 is fixedly connected to the outside of the bonding tube 81. Several balls 83 are also rolled and connected in a ring array on the bonding tube 81. The balls 83 are rolled and connected to the inner wall of the thin tube body 16.

[0036] Specifically, under the action of the counterweight ring 82, the bonding tube 81 slides downward inside the suction tube 74, ensuring that the bonding tube 81 is always close to the inner wall of the thin tube body 16. This allows the ball bearing 83 to adhere to the thin tube body 16. When the thin tube body 16 rotates, the ball bearing 83 prevents the bonding tube 81 from directly contacting the inner wall of the thin tube body 16, thus preventing wear on the bonding tube 81. This allows the bonding tube 81 to extend below the surface of the coolant inside the thin tube body 16, facilitating more thorough suction of the coolant. The remaining structure is the same as in Embodiment 1.

[0037] Example 3, referring to Figure 3 and Figure 4This is the third embodiment of the present invention. The difference between this embodiment and the second embodiment is that the pushing component 9 includes a U-shaped plate 91 fixedly connected to the movable seat 12, a second electric push rod 92 fixedly connected to the U-shaped plate 91, and the output end of the second electric push rod 92 fixedly connected to the cylinder 21.

[0038] Specifically, activating the second electric actuator 92 facilitates the insertion of the cylinder 21 into the inner side of the thin tube body 16, which is convenient for clamping the thin tube body 16, spraying coolant, and absorbing coolant.

[0039] Reference Figure 2 and Figure 3 It also includes a clamping component 10, which includes two symmetrically distributed grooves on the arc welding machine base 1. A clamping rod 101 is fixedly connected to the inner side of the groove. A slider 102 is slidably connected to the clamping rod 101. The slider 102 is fixedly connected to the corresponding movable seat 12. The slider 102 is slidably connected to the inner side of the groove. A clamping spring 103 is fixedly connected between the slider 102 and the inner wall of the groove. The clamping spring 103 is sleeved on the clamping rod 101.

[0040] Specifically, pushing the movable seat 12 causes the slider 102 to slide inside the groove. The clamping rod 101 limits the slider 102 during sliding and compresses the clamping spring 103. Releasing the movable seat 12 causes the slider 102 to slide in the opposite direction inside the groove under the action of the clamping spring 103, thus clamping and splicing the two thin tube bodies 16 together. The remaining structure is the same as that in Embodiment 2.

[0041] Example 4, refer to Figure 1 and Figure 2 The fourth embodiment of the present invention provides: a high-precision plasma arc welding machine automatic wire feeding device, including a housing 17 fixedly connected to a telescopic cylinder 13, a roller rotatably connected to the inner side of the housing 17, a first motor 18 fixedly connected to the outer side of the housing 17, the output shaft of the first motor 18 being fixedly connected to the roller shaft, a soft sleeve 19 fixedly connected to the telescopic cylinder 13, a welding wire 111 slidably connected to the inner side of the soft sleeve 19, and the top of the welding wire 111 being wound around the outer side of the roller.

[0042] Specifically, the first motor 18 is started, which drives the drum to rotate and wind or unwind the welding wire 111, so that the welding wire 111 moves inside the soft sleeve 19.

[0043] Based on embodiments 1-4, the working principle of this invention is as follows: A thin tube body 16 is inserted inside the rotating ring 15. Under the action of the clamping spring 103, the two thin tube bodies 16 are tightly joined together. The telescopic cylinder 13 is activated, moving the welding torch 14 towards the thin tube body 16. The first motor 18 is activated to release the welding wire 111. The second motor 33 is activated, rotating the bidirectional threaded rod 31, causing the nut 32 to slide on the bidirectional threaded rod 31, moving the connecting rod 22, which in turn moves the expansion seat 23, causing the roller 24 to abut against the inner wall of the thin tube body 16, thus clamping the thin tube body 16. When the thin tube body 16 is being welded, the external coolant spray outlet is connected to the connecting pipe 45, allowing the coolant to enter the spray cylinder 41 from the connecting pipe 45, enter the nozzle 44 through the through hole 43, and be sprayed out from the nozzle 44. Because the nozzle 44 has a small aperture, impurities in the coolant can easily clog the nozzle 44. When nozzle 44 becomes clogged, the liquid in spray cylinder 41 increases, pushing pressure plate 52 to move, which in turn moves moving plate 53, compressing pressure spring 54. This causes push block 63 to slide inside inclined groove 61. Under the action of inclined groove 61, center rod 51 rotates, causing mounting plate 42 to rotate. This causes nozzle 44 on one side of mounting plate 42 to rotate to the top of mounting plate 42, and nozzle 44 on the top of mounting plate 42 to rotate to one side of mounting plate 42, switching between old and new nozzles 44. This allows coolant in spray cylinder 41 to spray out again, reducing pressure in spray cylinder 41. Pressure spring 54 resets, causing pressure plate 52 to reset, completing the switching of nozzle 44. Activating the first electric actuator 73 causes the sealing plate 72 to move inside the liquid suction box 71, giving the liquid suction tube 74 suction force to absorb the coolant inside the thin tube body 16. Under the action of the counterweight ring 82, the bonding tube 81 moves downward continuously, causing the ball bearing 83 to adhere to the inner wall of the thin tube body 16. This not only keeps the bonding tube 81 below the coolant surface of the thin tube body 16, but also prevents wear on the bonding tube 81.

[0044] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A high-precision plasma arc welding machine, comprising an arc welding machine base (1), a gantry frame (11) on the top of the arc welding machine base (1), two movable seats (12) symmetrically distributed on the top of the arc welding machine base (1), a telescopic cylinder (13) on the gantry frame (11), a welding torch (14) on the output end of the telescopic cylinder (13), a rotating ring (15) on the inner side of the movable seat (12), and a thin tube body (16) inserted into the inner side of the rotating ring (15), characterized in that: It also includes a spraying and liquid absorption unit installed inside the thin tube body (16); The spraying and liquid absorption unit includes a spraying component and a liquid absorption component disposed in the thin tube body (16). The spraying component includes a tightening component (2) disposed in the thin tube body (16). The tightening component (2) is provided with a driving component (3) and a spraying component (4). The spraying component is used to spray coolant into the thin tube body (16), and the liquid suction component is used to absorb and remove the sprayed coolant. The expansion assembly (2) includes a cylinder (21) respectively disposed in two thin tube bodies (16). Several through slots are arranged in a ring array on the cylinder (21). Two connecting rods (22) are symmetrically arranged inside the through slots. An expansion seat (23) is provided at the end of the two connecting rods (22) away from the cylinder (21). A roller (24) is provided on the expansion seat (23). The roller (24) is in rolling connection with the inner wall of the thin tube body (16).

2. The high-precision plasma arc welding machine according to claim 1, characterized in that: The drive assembly (3) includes a bidirectional threaded rod (31) disposed inside the cylinder (21). Two nuts (32) are symmetrically distributed on the bidirectional threaded rod (31). The connecting rod (22) is rotatably connected to the nuts (32) at one end near the bidirectional threaded rod (31). A second motor (33) is also disposed on the cylinder (21). The output shaft of the second motor (33) is fixedly connected to the bidirectional threaded rod (31).

3. The high-precision plasma arc welding machine according to claim 1, characterized in that: The spraying assembly (4) includes a spraying cylinder (41) disposed on one of the cylinders (21). A mounting plate (42) is provided at the end of the spraying cylinder (41) away from the cylinder (21). A through hole (43) is provided at the top of the end of the spraying cylinder (41) near the mounting plate (42). Several nozzles (44) are arranged in a ring array on the mounting plate (42). A connecting pipe (45) is provided on the spraying cylinder (41). The end of the connecting pipe (45) away from the spraying cylinder (41) extends to the outside of the thin tube body (16).

4. The high-precision plasma arc welding machine according to claim 3, characterized in that: The spraying component also includes a pressure component (5) and a push component (6) disposed on the spraying assembly (4). The pressure assembly (5) includes a central rod (51) disposed inside the spray cylinder (41), the central rod (51) being fixedly connected to the mounting circular plate (42), a pressure plate (52) being disposed on the central rod (51), the pressure plate (52) being slidably connected to the spray cylinder (41) with a limiting seal, a movable plate (53) being disposed on the pressure plate (52), the movable plate (53) being slidably connected to the central rod (51), and a pressure spring (54) being disposed between the movable plate (53) and the inner wall of the spray cylinder (41), the pressure spring (54) being sleeved on the central rod (51).

5. The high-precision plasma arc welding machine according to claim 4, characterized in that: The push-turn assembly (6) includes several inclined slots (61) arranged in a ring array on the central rod (51), and several straight slots (62) arranged in a ring array on the central rod (51). The straight slots (62) connect two adjacent inclined slots (61). A push block (63) is provided on the inner side of the inclined slots (61) and the straight slots (62). The push block (63) is fixedly connected to the moving plate (53).

6. The high-precision plasma arc welding machine according to claim 1, characterized in that: The liquid suction component includes a liquid suction assembly (7) and a bonding assembly (8) disposed inside the thin tube body (16), and a pushing assembly (9) disposed outside the movable seat (12). The liquid suction assembly (7) includes a liquid suction box (71) disposed on another cylinder (21), a sealing plate (72) disposed inside the liquid suction box (71), a first electric push rod (73) disposed on the top of the liquid suction box (71), the output end of the first electric push rod (73) being fixedly connected to the sealing plate (72), and a liquid suction tube (74) disposed on one side of the bottom of the liquid suction box (71).

7. The high-precision plasma arc welding machine according to claim 6, characterized in that: The bonding assembly (8) includes a bonding tube (81) disposed inside the suction tube (74), a counterweight ring (82) disposed outside the bonding tube (81), and a number of ball bearings (83) arranged in a ring array on the bonding tube (81), the ball bearings (83) being rolledly connected to the inner wall of the thin tube body (16).

8. The high-precision plasma arc welding machine according to claim 6, characterized in that: The pushing component (9) includes a U-shaped plate (91) disposed on the movable seat (12), and a second electric push rod (92) is disposed on the U-shaped plate (91). The output end of the second electric push rod (92) is fixedly connected to the cylinder (21).

9. The high-precision plasma arc welding machine according to claim 8, characterized in that: It also includes a clamping assembly (10), which includes two symmetrically distributed grooves on the arc welding machine base (1). A clamping rod (101) is provided inside the groove, and a slider (102) is provided on the clamping rod (101). The slider (102) is fixedly connected to the corresponding moving seat (12), and the slider (102) is slidably connected to the inside of the groove. A clamping spring (103) is provided between the slider (102) and the inner wall of the groove, and the clamping spring (103) is sleeved on the clamping rod (101).

10. An automatic wire feeding device for a high-precision plasma arc welding machine, employing the high-precision plasma arc welding machine as described in any one of claims 1-8, characterized in that: The device includes a housing (17) mounted on a telescopic cylinder (13), with a roller mounted inside the housing (17) and a first motor (18) mounted outside the housing (17). The output shaft of the first motor (18) is fixedly connected to the roller shaft. A soft sleeve (19) is also mounted on the telescopic cylinder (13), with a welding wire (111) mounted inside the soft sleeve (19). The top of the welding wire (111) is wound around the outside of the roller.

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