Plasma welding device for square tube welding

Abstract

The invention provides a plasma welding device for square tube welding, and belongs to the technical field of plasma welding, the plasma welding device comprises a moving module, a plasma welding head is arranged on the moving module, a cover body is arranged at the lower end of the plasma welding head, a smoke suction module is arranged on the cover body, and a smoke dust treatment module is arranged on one side of the smoke suction module. According to the plasma welding device for square tube welding, the problems that an existing plasma welding device for square tube welding can generate certain smoke dust in the welding process, the smoke dust cannot be treated in time, and then the surrounding environment is polluted are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of plasma welding, and particularly relates to a plasma welding device for square tube welding. Background Art

[0002] Plasma welding is an arc welding technology with high energy density. This welding method uses the high temperature generated by the plasma to melt the surface of the steel plate and weld the steel plate during the heating process. Compared with traditional gas shielded welding, the energy density of plasma welding is much higher than that of other arc welding technologies. It can quickly heat the weld seam to a sufficient temperature to achieve high-speed welding. Plasma welding can be used to weld steel plates of various materials and thicknesses and is widely used in fields such as aviation and automobile manufacturing.

[0003] When the existing plasma welding device for square tube welding is in welding, the plasma welding head is driven by a moving module to move for welding. However, during the welding process, a certain amount of smoke and dust will be generated, and the smoke and dust cannot be treated in time, resulting in pollution of the surrounding environment. Summary of the Invention

[0004] The present invention provides a plasma welding device for square tube welding, aiming to solve the problem that the existing plasma welding device for square tube welding generates a certain amount of smoke and dust during the welding process, and the smoke and dust cannot be treated in time, resulting in pollution of the surrounding environment.

[0005] An embodiment of the present invention provides a plasma welding device for square tube welding, including a moving module, on which a plasma welding head is installed. A cover body is installed at the lower end of the plasma welding head, and a smoking module is installed on the cover body. A smoke and dust treatment module is installed on one side of the smoking module; The smoke and dust treatment module includes a treatment barrel, and a treatment unit for separating smoke and dust is installed in the treatment barrel; The treatment unit includes a separation cylinder, and a bearing platform is fixedly connected to the bottom of the treatment barrel; A decontamination unit for removing the particulate matter adhering to the wall surface of the separation cylinder. The decontamination unit includes a storage cylinder, a leak-proof cylinder and a passage D. The bottom of the passage D extends into the separation cylinder. The top of the passage D is indirectly connected to the passage C through the leak-proof cylinder. A number of rotating blades are installed on the outer peripheral surface of the passage D; A linkage unit for driving the decontamination unit to rotate. The top of the decontamination unit is connected to the linkage unit; A sundry collection unit. The sundry collection unit includes an outer ring. The inner surface of the outer ring is fixedly connected to the lower end of the outer wall of the passage D, and a number of collection ports are reserved on the outer ring; A connection control unit for controlling the connection between the storage cylinder, the passage C and the passage D. The connection control unit includes a blocking platform, and the blocking platform is in close contact with the inner wall of the passage C to form a blocking structure; A restraint bar is fixedly connected in channel C. A guiding column is movably installed in the center of the restraint bar. The bottom of the guiding column is fixedly connected to the plugging platform. An elastic member A is hoop-connected on the outer peripheral surface of the guiding column. The two vertical sides of the elastic member A are respectively fixedly connected to the restraint bar and the plugging platform. A linkage rod is installed at the bottom of channel D. The linkage rod passes through channel D. A rotating rod B is fixedly connected in the center of the linkage rod. Threaded ports are reserved on the outer peripheral surface of the rotating rod B and the inner peripheral surface of the bottom of channel D, and they are threadedly connected to each other through the threaded ports. The bottom of the linkage rod is fixedly connected to a moving platform. A restraint channel is hoop-connected on the outside of the moving platform. The lower wall surface of the restraint channel is fixedly connected to the lower wall surface inside the treatment barrel. The moving platform is rectangular. The moving platform is movably connected to the restraint channel. The upper wall surface of the linkage rod is in contact with the plugging platform.

[0006] Furthermore, the moving module includes a bracket. A longitudinal moving module is welded to the upper end of the bracket. A vertical moving module is installed on the longitudinal moving module. A transverse moving module is installed on the vertical moving module. The plasma welding head is installed on the transverse moving module.

[0007] Furthermore, an air pump is installed in the leak-proof cylinder. A check valve A is installed between the leak-proof cylinder and the storage cylinder. A check valve B is installed at the top of the leak-proof cylinder. One side of the storage cylinder is connected to channel B. The other side of channel B is connected to the air pump. A rubber block is movably installed in the leak-proof cylinder. A rotating rod A is installed in the center of the rubber block. Threaded ports are reserved on the outer peripheral surface of the rotating rod A and the inner surface of the center of the rubber block, and they are threadedly connected to each other through the threaded ports. The top of the rotating rod A is rotationally connected to channel B. The bottom of the rotating rod A is respectively connected to channel C and channel D. A number of through ports are reserved on the wall surface of channel D.

[0008] Furthermore, the smoking module includes an air extraction joint fixedly connected to the upper end of the cover. A hose is connected to the air extraction joint. The other side of the hose is connected to a fan. The other side of the fan is connected to a concave tube. Both sides of the concave tube are connected to a conical shell.

[0009] Furthermore, the top of the peeling cylinder is fixedly connected to the inside of the treatment barrel. The tops of both sides of the peeling cylinder are connected to channel A. The top of channel A passes through the treatment barrel, and the tail of channel A is connected to an access box. The access box is connected to the conical shell. An activated carbon peeling plate is installed at the top of the treatment barrel. The activated carbon peeling plates are mirror-installed on the four sides of the treatment barrel.

[0010] Furthermore, a motor is fixedly connected to the cover plate at the top of the treatment barrel. The output end of the motor is fixedly connected to a rotating disk B. A rotating disk A is fixedly connected to the outer peripheral surface of the top of the rotating rod A. A number of teeth are reserved on the outer peripheral surfaces of the rotating disk A and the rotating disk B, and they are engaged with a chain.

[0011] Furthermore, two circles of rotating blades are installed and are mirror-installed on the two vertical sides of channel D.

[0012] Furthermore, a barrier sheet is in contact and installed on the lower wall surface of the outer ring. The bottoms on both sides of the barrier sheet are fixedly connected to channel E. Channel E passes through the barrier sheet. The bottoms on both sides of the treatment barrel pass through the collection box. The top of the collection box is connected to the lower end of channel E. The collection ports are arranged in a circular pattern and are adapted to the mouths of channel E.

[0013] The beneficial effects of the present invention are as follows: 1. In the present invention, the plasma welding head is moved above the square tube welding position by the horizontal movement module, and the vertical movement module moves the plasma welding head downward, so that the cover on the plasma welding head moves to the upper wall surface of the square tube welding position. The plasma welding head welds the square tube. The longitudinal movement module moves the plasma welding head longitudinally, thereby realizing the moving welding of the square tube. During the welding process, fumes are generated, and the smoking module sucks the fumes into the fume treatment module, and the fume treatment module treats the fumes, greatly enhancing environmental protection.

[0014] 2. In the present invention, the treatment unit treats the sucked fumes, and the assisted decontamination unit can store high-pressure air during the operation of this device and discharge high-pressure air into the inside of the stripping cylinder regularly, thereby removing the waste adhered to the wall surface of the stripping cylinder and ensuring the stripping function of the stripping cylinder for fumes; at the same time, through the cooperation of the installed debris collection unit and the decontamination unit, and driven by the linkage unit, the installation of the debris collection unit can blow away the debris in the stripping ports on the stripping cylinder when air is ejected from channel D, and realize collection during the rotation of the debris collection unit, enhancing the convenience during the use of the device; and through the installation of the connection control unit to cooperate with the decontamination unit, during the operation of the decontamination unit and the rotation of channel D, the storage cylinder is controlled to be connected to it, and the high-pressure air in the storage cylinder can be regularly controlled to be ejected through channel D for decontamination.

[0015] Other features and advantages of the present invention will be described in the following description, and, in part, will be obvious from the description, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained by the structures specifically pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings are used to provide a further understanding of the present invention and constitute a part of the description. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention. In the drawings: Figure 1 It is the front view structural schematic diagram of the embodiment of the present invention; Figure 2 It is the structural schematic diagram of the longitudinal movement module of the embodiment of the present invention; Figure 3 It is the structural schematic diagram of the vertical movement module of the embodiment of the present invention; Figure 4Schematic structural diagram of the lateral movement module according to an embodiment of the present invention; Figure 5 Schematic structural diagram of the first perspective of the smoke and dust treatment module according to an embodiment of the present invention; Figure 6 Schematic structural diagram of the second perspective of the smoke and dust treatment module according to an embodiment of the present invention; Figure 7 Schematic sectional view of the smoke and dust treatment module according to an embodiment of the present invention; Figure 8 Schematic sectional view of the peeling cylinder according to an embodiment of the present invention; Figure 9 Schematic structural diagram of the connection between channel D and rotating rod B according to an embodiment of the present invention; Figure 10 Schematic structural diagram of the anti-leakage cylinder and rubber block according to an embodiment of the present invention; Figure 11 Schematic structural diagram of the outer ring and the collecting port according to an embodiment of the present invention; Figure 12 Schematic structural diagram of the constraint channel and the moving platform according to an embodiment of the present invention; Figure 13 For an embodiment of the present invention Figure 9 Magnified structural diagram at M; Figure 14 Schematic structural diagram of the motor and rotating disk B according to an embodiment of the present invention; Reference numerals: 1, bracket; 2, longitudinal movement module; 3, vertical movement module; 4, lateral movement module; 5, plasma welding head; 6, cover body; 7, smoking module; 8, smoke and dust treatment module; 21, track A; 22, sliding seat A; 23, tooth opening A; 24, servo motor A; 25, gear A; 31, track B; 32, servo motor B; 33, lead screw; 34, sliding seat B; 41, track C; 42, sliding seat C; 43, servo motor C; 44, tooth opening B; 45, gear B; 71, air extraction joint; 72, hose; 73, fan; 74, concave pipe; 75, conical shell; 81, treatment barrel; 82, bearing platform; 831, peeling cylinder; 832, access box; 833, channel A; 834, activated carbon peeling plate; 841, anti-leakage cylinder; 842, rubber block; 843, channel B; 844, storage cylinder; 845, check valve A; 846, check valve B; 847, channel C; 848, channel D; 849, rotating rod A; 851, motor; 852, rotating disk A; 853, rotating disk B; 854, chain; 86, rotating blade; 871, outer ring; 872, barrier sheet; 873, channel E; 874, collecting box; 875, collecting port; 881, constraint bar; 882, guiding column; 883, plugging platform; 884, elastic member A; 885, linkage rod; 886, rotating rod B; 887, moving platform; 888, constraint channel. Detailed implementation manners

[0017] In order to make the objectives, technical solutions and advantages of the technical solutions of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments of the present invention. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0018] Referring to Figure 1 , an embodiment of the present invention provides a plasma welding device for square tube welding, which includes a moving module. A plasma welding head 5 is installed on the moving module. A cover body 6 is installed at the lower end of the plasma welding head 5. A smoking module 7 is installed on the cover body 6. A support frame is installed below the smoking module 7. A dust treatment module 8 is installed on one side of the smoking module 7. An opening is provided on the back of the cover body 6.

[0019] The moving module includes a bracket 1. A longitudinal moving module 2 is welded to the upper end of the bracket 1. A vertical moving module 3 is installed on the longitudinal moving module 2. A horizontal moving module 4 is installed on the vertical moving module 3. The plasma welding head 5 is installed on the horizontal moving module 4.

[0020] The plasma welding head 5 is moved to the upper part of the square tube welding position through the horizontal moving module 4. The vertical moving module 3 moves the plasma welding head 5 downward, so that the cover body 6 on the plasma welding head 5 moves to the upper wall surface of the square tube welding position. The plasma welding head 5 performs welding on the square tube. The longitudinal moving module 2 moves the plasma welding head 5 longitudinally, thereby realizing the moving welding of the square tube. Smoke and dust will be generated during the welding process. The smoking module 7 sucks the smoke and dust into the dust treatment module 8, and the dust treatment module 8 treats the smoke and dust, greatly improving environmental protection.

[0021] Referring to Figure 1 And Figure 2 , the longitudinal moving module 2 includes a track A21 fixed to the bracket 1. A sliding seat A22 is slidably installed in the track A21. A number of tooth openings A23 are reserved on one side inside the track A21. A gear A25 is installed at the upper end of the tooth opening A23 in an engaged manner. A servo motor A24 is fixed to one side of the sliding seat A22. The output end of the servo motor A24 is fixed to one side of the gear A25.

[0022] The servo motor A24 drives the gear A25 to rotate. The gear A25 longitudinally moves back and forth along the tooth opening A23, thereby driving the plasma welding head 5 to move back and forth to perform moving welding on the square tube.

[0023] Referring toFigure 1 And Figure 3 As shown in Figure 3 and , the vertical movement module 3 includes a track B31 fixedly connected to the outer wall of the sliding seat A22. The upper end of the track B31 is fixedly connected to a servo motor B32. A lead screw 33 is rotatably connected inside the track B31. One end of the lead screw 33 is connected to the output end of the servo motor B32. A sliding seat B34 is threadedly connected to the lead screw 33. The sliding seat B34 is slidably connected to the track B31.

[0024] The servo motor B32 drives the lead screw 33 to rotate. The lead screw 33 drives the sliding seat B34 to move vertically, and then drives the plasma welding head 5 and the cover 6 to change the welding position vertically, realizing the adjustment of the vertical position.

[0025] Refer to Figure 1 And Figure 4 As shown in Figure 1 and Figure 4 , the horizontal movement module 4 includes a track C41 fixedly connected to the sliding seat B34. A sliding seat C42 is slidably arranged on the track C41. One side of the sliding seat C42 is fixedly connected to a servo motor C43. The other side of the sliding seat C42 is connected to the plasma welding head 5. A number of tooth openings B44 are reserved in the track C41. The output end of the servo motor C43 extends into the interior of the sliding seat C42 and is fixedly connected to a gear B45. The gear B45 is engaged with the tooth openings B44.

[0026] The servo motor C43 drives the gear B45 to engage and move on the tooth openings B44, and then makes the sliding seat C42 slide on the track C41, so as to adjust the horizontal position of the plasma welding head 5, facilitating the welding of the square pipe.

[0027] Refer to Figure 1 As shown in Figure 1 , the smoking module 7 includes an air extraction joint 71 fixedly connected to the upper end of the cover 6. A hose 72 is connected to the air extraction joint 71. The other side of the hose 72 is connected to a fan 73. The other side of the fan 73 is connected to a concave pipe 74. Both sides of the concave pipe 74 are connected to a conical shell 75.

[0028] The fan 73 operates to draw the soot from the cover 6 through the air extraction joint 71, the hose 72, the fan 73, the concave pipe 74 and the conical shell 75 into the soot treatment module 8, ensuring that the soot treatment module 8 can timely treat the soot.

[0029] Refer to Figure 1 And Figures 5 - 14, the soot treatment module 8 includes a treatment barrel 81 which is used to strip the soot generated during welding. The treatment barrel 81 contains treatment units which are used to strip the soot. The treatment unit includes a stripping cylinder 831. The bottom of the treatment barrel 81 is fixedly connected to a bearing platform 82. The top of the stripping cylinder 831 is fixedly connected to the inside of the treatment barrel 81. The tops on both sides of the stripping cylinder 831 are connected to a channel A833. The top of the channel A833 passes through the treatment barrel 81, and the tail of the channel A833 is connected to an access box 832. The access box 832 is connected to the conical shell 75. An activated carbon stripping plate 834 is installed at the top of the treatment barrel 81, and the activated carbon stripping plates 834 are symmetrically installed on the four sides of the treatment barrel 81. Through the cooperation of the access box 832 and the channel A833, the soot can be drawn into the treatment barrel 81 and arranged outside the stripping cylinder 831. After being stripped by the stripping cylinder 831, it is drawn inside and changes upward through the activated carbon stripping plate 834, and after being stripped again, it flows away. The diameter of the stripping opening on the stripping cylinder 831 is larger than the width of the stripping opening on the activated carbon stripping plate 834, which can strip the soot again, enhance the soot treatment function, and strip the large particles in the soot through the stripping cylinder 831, and can also extend the replacement cycle of the activated carbon stripping plate 834; The decontamination unit removes the particulate matter adhering to the wall surface of the stripping cylinder 831 by blowing. The decontamination unit includes a storage cylinder 844, a leak-proof cylinder 841 and a channel D848. The bottom of the channel D848 extends into the stripping cylinder 831. The top of the channel D848 is indirectly connected to the channel C847 through the leak-proof cylinder 841. A number of rotating vanes 86 are installed on the outer peripheral surface of the channel D848; the linkage unit is used to drive the decontamination unit to rotate, and the top of the decontamination unit is connected to the linkage unit; an air pump is installed in the leak-proof cylinder 841. A check valve A845 is installed between the leak-proof cylinder 841 and the storage cylinder 844, and a check valve B846 is installed at the top of the leak-proof cylinder 841. One side of the storage cylinder 844 is connected to the channel B843, and the other side of the channel B843 is connected to the air pump. A non-woven fabric is installed at the mouth of the check valve B846; a rubber block 842 is movably installed in the leak-proof cylinder 841. A rotating rod A849 is installed in the center of the rubber block 842. Threaded ports are reserved on the outer peripheral surface of the rotating rod A849 and the inner surface of the center of the rubber block 842, and they are threadedly connected through the threaded ports. The rotating rod A849 has a hollow structure. The top of the rotating rod A849 is rotatably connected to the channel B843. The bottom of the rotating rod A849 is connected to the channel C847 and the channel D848 respectively, and a number of through ports are reserved on the wall surface of the channel D848; a motor 851 is fixedly connected to the cover plate on the top of the treatment barrel 81. The output end of the motor 851 is fixedly connected to a rotating disc B853. A rotating disc A852 is fixedly connected to the outer peripheral surface of the top of the rotating rod A849. A number of teeth are reserved on the outer peripheral surfaces of the rotating disc A852 and the rotating disc B853, and they are meshed and connected by a chain 854; the rotating vanes 86 are installed in two circles and are mirror-installed on the vertical sides of the channel D848; the motor 851 drives the decontamination unit to act. The motor 851 drives the rotating disc B853 to rotate. The rotating disc B853 drives the rotating disc A852 and the rotating rod A849 to rotate together through the chain 854. The rotating rod A849 can drive the channel C847, the channel D848 and the rotating vanes 86 to rotate together. The rotation of the rotating vanes 86 can drive the gas in the treatment barrel 81 to move, and accelerate the outward movement of the gas. During the rotation of the rotating rod A849, it can drive the rubber block 842 to move up and down in the leak-proof cylinder 841. During the movement of the rubber block 842, it cooperates with the check valve B846 and the check valve A845 to continuously draw the external gas into the leak-proof cylinder 841, and then transfer it to the storage cylinder 844 for storage. When the channel C847 is connected to the channel D848, the high-pressure gas in the storage cylinder 844 can be transferred to the channel D848 through the cooperation of the channel B843, the rotating rod A849 and the channel C847, and is ejected through the through ports reserved on the channel D848, thereby blowing away the particulate matter collected in the stripping port on the stripping cylinder 831. The particulate matter is blown away by the high-pressure technology, strengthening the decontamination function of the stripping cylinder 831.

[0030] Turn on the connection control unit. The connection control unit is used to control the connection between the storage cylinder 844, the channel C847, and the channel D848. The connection control unit includes a blocking platform 883. The blocking platform 883 is in close contact with the inner wall of the channel C847 to form a blocking structure. A restraining bar 881 is fixed in the channel C847. A guiding column 882 is movably installed in the middle of the restraining bar 881, and the bottom of the guiding column 882 is fixed to the blocking platform 883. An elastic member A884 is sleeved on the outer peripheral surface of the guiding column 882. The vertical two sides of the elastic member A884 are respectively fixed to the restraining bar 881 and the blocking platform 883. A linkage rod 885 is installed at the bottom of the channel D848, and the linkage rod 885 passes through the channel D848. A rotating rod B886 is fixed in the middle of the linkage rod 885. Threaded ports are reserved on the outer peripheral surface of the rotating rod B886 and the inner peripheral surface of the bottom of the channel D848 and are threadedly connected to each other through the threaded ports. The cooperation between the threaded ports forms a structure for vertical reciprocating movement. The bottom of the linkage rod 885 is fixed to a changing platform 887. A restraining channel 888 is sleeved on the outer side of the changing platform 887. The lower wall surface of the restraining channel 888 is fixed to the lower wall surface inside the treatment barrel 81. The changing platform 887 is rectangular. The changing platform 887 is movably connected to the restraining channel 888. The upper wall surface of the linkage rod 885 is in contact with the blocking platform 883. The radius of the blocking platform 883 is larger than the radius of the linkage rod 885. The connection between the channel C847 and the channel D848 can be controlled by the connection control unit. By pressing the blocking platform 883 downward through the elastic member A884, the bottom of the channel C847 can be blocked, preventing the blockage between the channel C847 and the channel D848. And during the rotation of the channel D848, through the cooperation between the threaded ports, the linkage rod 885 and the changing platform 887 are pulled to move vertically back and forth. When the linkage rod 885 moves upward, it can press the blocking platform 883 upward, thereby canceling the blockage of the channel C847. And when the linkage rod 885 returns downward, the blocking platform 883 continues to perform the blocking. Under the cooperation of the changing platform 887 and the restraining channel 888, the linkage rod 885 can prevent the rotation of the channel D848. Driven by the decontamination unit itself, the connection between the channel C847 and the channel D848 can be controlled on time, and then the particles adhering to the stripping cylinder 831 can be removed on time.

[0031] Debris collection unit, the debris collection unit includes an outer ring 871, the inner surface of the outer ring 871 is fixedly connected to the lower end of the outer wall of the channel D848, and a number of collection ports 875 are reserved on the outer ring 871; a barrier sheet 872 is contact-mounted on the lower wall surface of the outer ring 871, and channels E873 are fixedly connected to the bottoms on both sides of the barrier sheet 872. The channels E873 pass through the barrier sheet 872, and the bottoms on both sides of the treatment barrel 81 pass through the collection box 874. The top of the collection box 874 is connected to the lower end of the channel E873. The collection ports 875 are arranged in a circular pattern, and the collection ports 875 are adapted to the mouths of the channels E873; through the installation of the debris collection unit, the debris removed by the decontamination unit can be collected. Through the connection of the outer ring 871 and the channel D848, the outer ring 871 and a number of collection ports 875 rotate along with the channel D848, and during the rotation, the debris falling on the wall surface of the peeling cylinder 831 is driven to move. When it moves to the mouth of the channel E873, it falls into the channel E873 and then falls into the collection box 874 for collection.

[0032] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A plasma welding device for square tube welding, comprising a moving module, on which a plasma welding head is installed, characterized in that, A cover is installed at the lower end of the plasma welding head, and a smoking module is installed on the cover. A dust treatment module is installed on one side of the smoking module. The dust treatment module includes a treatment barrel, and a treatment unit for separating dust is installed in the treatment barrel. The treatment unit includes a separation cylinder, and a bearing platform is fixedly connected to the bottom of the treatment barrel. A decontamination unit for removing the particulate matter adhering to the wall surface of the separation cylinder. The decontamination unit includes a storage cylinder, a leak-proof cylinder and a passage D. The bottom of the passage D extends into the separation cylinder. The top of the passage D is indirectly connected to the passage C through the leak-proof cylinder. A number of rotating vanes are installed on the outer peripheral surface of the passage D. A linkage unit for driving the decontamination unit to rotate. The top of the decontamination unit is connected to the linkage unit. A sundry collection unit. The sundry collection unit includes an outer ring. The inner surface of the outer ring is fixedly connected to the lower end of the outer wall of the passage D. A number of collection ports are reserved on the outer ring. A connection control unit for controlling the connection among the storage cylinder, the passage C and the passage D. The connection control unit includes a plugging platform. The plugging platform is in close contact with the inner wall of the passage C to form a plugging structure. A restraint bar is fixedly connected in the passage C. A guiding column is movably installed in the middle of the restraint bar. The bottom of the guiding column is fixedly connected to the plugging platform. An elastic member A is hoop-mounted on the outer peripheral surface of the guiding column. The vertical two sides of the elastic member A are respectively fixedly connected to the restraint bar and the plugging platform. A linkage rod is installed at the bottom of the passage D. The linkage rod passes through the passage D. A rotating rod B is fixedly connected in the middle of the linkage rod. Threaded ports are reserved on the outer peripheral surface of the rotating rod B and the inner peripheral surface of the bottom of the passage D, and they are threadedly connected through the threaded ports. The bottom of the linkage rod is fixedly connected to a changing platform. A restraint channel is hoop-mounted on the outside of the changing platform. The lower wall surface of the restraint channel is fixedly connected to the inner lower wall surface of the treatment barrel. The changing platform is rectangular. The changing platform is movably connected to the restraint channel. The upper wall surface of the linkage rod is in contact with the plugging platform.

2. The plasma welding device for square tube welding according to claim 1, characterized in that: The moving module includes a bracket. A longitudinal moving module is welded to the upper end of the bracket. A vertical moving module is installed on the longitudinal moving module. A transverse moving module is installed on the vertical moving module. The plasma welding head is installed on the transverse moving module.

3. The plasma welding device for square tube welding according to claim 1, characterized in that: An air pump is installed in the leak-proof cylinder. A check valve A is installed between the leak-proof cylinder and the storage cylinder. A check valve B is installed at the top of the leak-proof cylinder. One side of the storage cylinder is connected to the passage B. The other side of the passage B is connected to the air pump. A rubber block is movably installed in the leak-proof cylinder. A rotating rod A is installed in the middle of the rubber block. Threaded ports are reserved on the outer peripheral surface of the rotating rod A and the inner surface of the middle of the rubber block, and they are threadedly connected through the threaded ports. The top of the rotating rod A is rotatably connected to the passage B. The bottom of the rotating rod A is respectively connected to the passage C and the passage D. A number of through ports are reserved on the wall surface of the passage D.

4. A plasma welding device for square tube welding according to claim 1, characterized in that: The smoking module includes an air extraction joint fixedly connected to the upper end of the cover. A hose is connected to the air extraction joint. The other side of the hose is connected to a fan. The other side of the fan is connected to a concave pipe. Both sides of the concave pipe are connected to a conical shell.

5. The plasma welding device for square tube welding according to claim 4, characterized in that: The top of the separation cylinder is fixedly connected to the inside of the treatment barrel. The tops of both sides of the separation cylinder are connected to the passage A. The top of the passage A passes through the treatment barrel, and the tail of the passage A is connected to an access box. The access box is connected to the conical shell. An activated carbon separation plate is installed at the top of the treatment barrel. The activated carbon separation plates are installed on the four sides of the treatment barrel in a mirror image manner.

6. A plasma welding device for square tube welding according to claim 1, characterized in that: A motor is fixedly connected to the cover plate at the top of the treatment barrel. The output end of the motor is fixedly connected to a rotating disk B. A rotating disk A is fixedly connected to the outer peripheral surface of the top of the rotating rod A. A number of teeth are reserved on the outer peripheral surfaces of the rotating disk A and the rotating disk B, and a chain is connected by engagement.

7. A plasma welding device for square tube welding according to claim 1, characterized in that: The rotating blades are arranged in two circles and are mirror-arranged on both vertical sides of the channel D.

8. A plasma welding device for square tube welding according to claim 1, characterized in that: A blocking sheet is contact-arranged on the lower wall surface of the outer circle. The bottoms of both sides of the blocking sheet are fixedly connected to a channel E. The channel E passes through the blocking sheet. The bottoms of both sides of the treatment barrel pass through the collection box. The top of the collection box is connected to the lower end of the channel E. The collection ports are arranged in a circular pattern, and the collection ports are adapted to the mouths of the channel E.

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