Plasma arc welding machine

Abstract

The invention relates to the technical field of plasma arc welding, in particular to a plasma arc welding machine which comprises a machine table, a placement structure is arranged on the inner side of the machine table, a positioning structure is arranged on the top side of the placement structure, a lifting structure is arranged on the bottom side of the placement structure, a welding structure is arranged in the middle of the machine table, and an adjusting structure is arranged on the inner side of the welding structure. A bearing structure is arranged on the placement structure; two parts to be welded can be synchronously rotated through the placement structure, a good welding effect is obtained, a workpiece of a cylindrical structure can be stably and accurately fixed through the positioning structure, and height adjustment can be conducted according to the specification of the welded workpiece through the lifting structure; the welding work of a cylindrical workpiece can be rapidly completed through the welding structure, the welding angle of the plasma welding gun can be adjusted through the adjusting structure, and a good fixing effect can be provided for tubular or other special-shaped workpieces through the bearing structure.

Description

Technical Field

[0001] The invention relates to the technical field of plasma arc welding, in particular to a plasma arc welding machine. Background Art

[0002] Plasma arc welding is a fusion welding method that uses the high-energy density beam of a plasma arc as the welding heat source. Plasma arc welding offers advantages such as concentrated energy, high productivity, fast welding speed, minimal stress and deformation, stable arc flow, and suitability for welding thin plates and box materials.

[0003] In actual production life, the welded workpieces have different structural characteristics. When welding the end of a cylindrical workpiece, since the welding path is a circular structure, the workpiece or the welding gun must be rotated during the welding process. During this process, the welding path is prone to deviation, which leads to a decrease in welding strength. Moreover, when the welding surface is non-planar, it is difficult for existing welding equipment to ensure that the workpiece is welded in a vertical state on non-planar structures such as micro-arc surfaces. Moreover, when the welded workpieces are all cylindrical structures such as pipes, it is difficult to ensure the stability of the workpiece during welding. Summary of the Invention

[0004] In view of the problems in the prior art, the present invention provides a plasma arc welding machine.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a plasma arc welding machine, including a machine platform, a placement structure is provided on the inner side of the machine platform, a positioning structure is provided on the top side of the placement structure, a lifting structure is provided on the bottom side of the placement structure, a welding structure is provided in the middle of the machine platform, an adjustment structure is provided on the inner side of the welding structure, and a bearing structure is provided on the placement structure.

[0006] Specifically, the placement structure includes a supporting plate, which is rotatably connected to the machine table, and a driving sleeve is slidably connected to the bottom side of the supporting plate. A positioning ring is provided on the top side of the supporting plate, and the positioning ring is rotatably connected to the top side of the machine table. The positioning ring and the driving sleeve are coaxially arranged and have equal diameters. The positioning structure includes a clamping rod, and a plurality of clamping rods are threadedly connected to the side of the positioning ring, and the angles between adjacent clamping rods are equal.

[0007] Specifically, the side of the machine is rotatably connected to a drive shaft, the top of the drive shaft is fixedly connected to a first pulley, the side of the positioning ring is provided with a first tooth groove, the side of the positioning ring is engaged with a first transmission tooth through the first tooth groove, the first transmission tooth is rotatably connected to the inner side of the machine, a first transmission belt is sleeved between the first transmission tooth and the first pulley, the bottom side of the drive shaft is fixedly connected to a second pulley, the side of the drive sleeve is engaged with a second transmission tooth, the second transmission tooth is rotatably connected to the inner side of the machine, and the first transmission tooth and the second transmission tooth are coaxially arranged and have equal diameters, and a second transmission belt is sleeved between the second transmission tooth and the second pulley.

[0008] Specifically, the inner side of the positioning ring is rotatably connected to a gear ring, the clamping rod is slidably connected to a synchronous gear, the synchronous gear and the gear ring are engaged with each other, and the side surface of the synchronous gear is in conflict with the gear ring, the end of the clamping rod is rotatably connected to a contact head, and multiple laser pens are obliquely installed on the outer side of the positioning ring, and the extension lines of the multiple laser pens converge at the same point.

[0009] Specifically, the lifting structure includes a support column, the inner side of the machine platform is slidably connected to the support column, the outer side of the support column is threadedly connected to a threaded sleeve, and the threaded sleeve is rotatably connected to the inner side of the machine platform.

[0010] Specifically, the top end of the support column is rollingly connected with a plurality of ball bearings, the top end of the support column is in contact with the bottom side of the supporting plate through the ball bearings, a second tooth groove is provided on the outer side of the threaded sleeve, the threaded sleeve is engaged with a second bevel gear through the second tooth groove, the side surface of the second bevel gear is engaged with a first bevel gear, and the side surface of the first bevel gear is rotationally connected to the machine platform.

[0011] Specifically, the welding structure includes a guide groove, a guide groove is opened in the middle of the machine, the machine is slidably connected to the mounting slider through the guide groove, an adjusting screw is rotatably connected to the middle of the machine, the adjusting screw is threadedly connected to the mounting slider, a mounting arm is provided on the side of the mounting slider, a plasma welding gun is installed at the end of the mounting arm, and the mounting arm is adjacent to one end of the mounting slider and is located on the same horizontal plane as the end of the plasma welding gun.

[0012] Specifically, the adjustment structure includes a second spring, the end of the mounting arm is slidingly connected to the mounting slider, the second spring is fixedly connected between the mounting arm and the mounting slider, the end of the mounting arm is slidingly connected to a positioning sleeve, and the positioning sleeve is rotatably connected to the inner side of the mounting slider.

[0013] Specifically, the positioning sleeve is slidably connected to a positioning block on both sides of the mounting arm, a third spring is fixedly connected between the positioning block and the positioning sleeve, a plurality of positioning grooves are provided on the inner side of the mounting slider, the end of the positioning block is engaged with the mounting slider through the positioning grooves, the other end of the positioning block is a hemispherical structure, and the spherical end of the positioning block conflicts with the side of the mounting arm.

[0014] Specifically, the supporting structure includes a limit plate, and two limit plates are rotatably connected to the two sides of the supporting plate. The limit plates on both sides are symmetrically arranged, and the ends of the limit plates are rotatably connected to the pushing plates. The ends of the pushing plates are slidably connected to the control slide rods, and the adjacent ends of the two control slide rods on the same side are slidably connected to the inner side of the adjustment block, and the adjustment block is slidably connected to the supporting plate.

[0015] Specifically, a first spring is fixedly connected between the two control slide rods on the same side, and a release block is slidably connected to the side of the adjustment block. Both sides of the release block are inclined structures, and the inclined side surfaces on both sides of the release block are respectively slidably connected to the end parts of the control slide rod on the same side. The other end of the control slide rod is fixedly connected to a ratchet block, and a ratchet groove is provided on the inner side of the supporting plate, and the ratchet block is engaged with the supporting plate through the ratchet groove.

[0016] The beneficial effects of the present invention are:

[0017] (1) The plasma arc welding machine described in the present invention has a placement structure provided on the inner side of the machine platform, and a positioning structure provided on the top side of the placement structure. The two parts to be welded can be rotated synchronously through the placement structure, so that the welding gun can obtain a good welding effect in a fixed state, and the cylindrical workpiece can be stably and accurately fixed through the positioning structure.

[0018] (2) The plasma arc welding machine described in the present invention has a lifting structure provided on the bottom side of the placement structure, through which the height can be adjusted according to the specifications of the welding workpiece. The cylindrical workpiece to be welded is fixed in the middle of the positioning ring through the positioning structure, and the bottom end of the workpiece is made to conflict with the workpiece on the supporting plate, thereby completing the precise positioning of the welding position.

[0019] (3) The plasma arc welding machine described in the present invention has a welding structure provided in the middle of the machine platform, and an adjustment structure provided on the inner side of the welding structure. The welding work on the cylindrical workpiece can be quickly completed through the welding structure, and the welding angle of the plasma welding gun can be adjusted through the adjustment structure to meet different welding needs.

[0020] (4) In the plasma arc welding machine described in the present invention, a bearing structure is provided on the placement structure, and the bearing structure can provide a good fixing effect for tubular or other special-shaped workpieces. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings and examples.

[0022] Figure 1 A schematic diagram of the overall structure provided by the present invention;

[0023] Figure 2 Schematic diagram of the connection structure between the machine platform and the carrier plate of the present invention;

[0024] Figure 3 for Figure 2 The enlarged structural diagram of part A is shown;

[0025] Figure 4 Schematic diagram of the connection structure between the positioning ring and the clamping rod of the present invention;

[0026] Figure 5 Schematic diagram of the connection structure between the driving sleeve and the bearing plate of the present invention;

[0027] Figure 6 Schematic diagram of the connection structure of the load-bearing plate and the limiting plate of the present invention;

[0028] Figure 7 for Figure 6 The enlarged structural diagram of part B is shown;

[0029] Figure 8 It is a structural schematic diagram of the carrying plate of the present invention;

[0030] Figure 9 for Figure 8 The enlarged structural diagram of part C is shown;

[0031] Figure 10 This is a schematic diagram of the connection structure between the mounting arm and the plasma welding gun of the present invention;

[0032] Figure 11 for Figure 10 The enlarged structural diagram of the D portion shown;

[0033] Figure 12 It is a schematic diagram of the connection structure of the mounting slide and the mounting arm of the present invention.

[0034] In the figure: 1. Machine; 2. Mounting structure; 201. Carrying plate; 202. Positioning ring; 203. Drive shaft; 204. First pulley; 205. First transmission belt; 206. First transmission tooth; 207. First tooth groove; 208. Second pulley; 209. Second transmission belt; 210. Second transmission tooth; 211. Drive sleeve; 3. Positioning structure; 301. Clamping rod; 302. Contact head; 303. Gear ring; 304. Synchronous gear; 305. Laser pointer; 4. Lifting structure; 401. First bevel gear; 402. Support column; 403. Threaded sleeve; 404 , second bevel gear; 405, second tooth groove; 406, ball bearing; 5, welding structure; 501, adjusting screw; 502, guide groove; 503, plasma welding gun; 504, mounting arm; 505, mounting slider; 6, bearing structure; 601, pushing plate; 602, limiting plate; 603, control slide; 604, adjusting block; 605, first spring; 606, release block; 607, ratchet block; 608, ratchet groove; 7, adjusting structure; 701, second spring; 702, positioning sleeve; 703, positioning block; 704, third spring; 705, positioning tooth groove. DETAILED DESCRIPTION

[0035] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0036] like Figure 1 、 Figure 3 、 Figure 4 、 Figure 7 、 Figure 11 As shown, a plasma arc welding machine described in the present invention includes a machine platform 1, an accommodation structure 2 is provided on the inner side of the machine platform 1, a positioning structure 3 is provided on the top side of the accommodation structure 2, a lifting structure 4 is provided on the bottom side of the accommodation structure 2, a welding structure 5 is provided in the middle of the machine platform 1, an adjustment structure 7 is provided on the inner side of the welding structure 5, and a bearing structure 6 is provided on the accommodation structure 2.

[0037] Specifically, such as Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9As shown, the placement structure 2 includes a carrying plate 201, which is rotatably connected to the machine 1. The bottom side of the carrying plate 201 is slidably connected to a driving sleeve 211. The top side of the carrying plate 201 is provided with a positioning ring 202, which is rotatably connected to the top side of the machine 1. The positioning ring 202 and the driving sleeve 211 are coaxially arranged and have equal diameters. The side of the machine 1 is rotatably connected to a driving shaft 203, and the top end of the driving shaft 203 is fixedly connected to a first pulley 204. The side of the positioning ring 202 is provided with a first tooth groove 207, and the side of the positioning ring 202 is passed through A first transmission tooth 206 is meshed with the first tooth groove 207, and the first transmission tooth 206 is rotatably connected to the inner side of the machine 1. A first transmission belt 205 is sleeved between the first transmission tooth 206 and the first pulley 204. A second pulley 208 is fixedly connected to the bottom side of the drive shaft 203. A second transmission tooth 210 is meshed with the side surface of the drive sleeve 211. The second transmission tooth 210 is rotatably connected to the inner side of the machine 1. The first transmission tooth 206 and the second transmission tooth 210 are coaxially arranged and have the same diameter. A second transmission belt 209 is sleeved between the second transmission tooth 210 and the second pulley 208.

[0038] The supporting plate 201 and the positioning ring 202 rotate at the same angular velocity. Since the driving sleeve 211 and the positioning ring 202 are coaxially arranged, the bottom end of the cylindrical workpiece fixed in the middle of the positioning ring 202 is brought into contact with the welding surface of the workpiece on the supporting plate 201 to make the two workpieces rotate synchronously. At this time, the welding equipment can complete the welding operation of the circular path in a fixed state, ensuring a good welding effect.

[0039] Specifically, such as Figure 1 、 Figure 2 、 Figure 4 As shown, the positioning structure 3 includes a clamping rod 301, and a plurality of clamping rods 301 are threadedly connected to the side of the positioning ring 202. The angles between adjacent clamping rods 301 are equal. The inner side of the positioning ring 202 is rotatably connected to a gear ring 303. A synchronous gear 304 is slidably connected to the clamping rod 301. The synchronous gear 304 and the gear ring 303 are engaged with each other, and the side of the synchronous gear 304 is in conflict with the gear ring 303. The end of the clamping rod 301 is rotatably connected to a contact head 302. A plurality of laser pens 305 are obliquely installed on the outer side of the positioning ring 202, and the extension lines of the plurality of laser pens 305 converge at the same point.

[0040] By rotating any clamping rod 301, the clamping rod 301 will move inward, and at the same time, through the transmission effect of the synchronous gear 304 and the gear ring 303, the other clamping rods 301 will rotate synchronously, so that the contact heads 302 at the ends of all clamping rods 301 will synchronously contact the side of the workpiece until the clamping and fixation of the workpiece is completed. Since the clamping rods 301 rotate synchronously, it can be ensured that workpieces of any diameter can be fixed to the middle position of the positioning ring 202 and maintain a vertical state with the bottom side supporting plate 201, and the laser pen 305 arranged on the side of the positioning ring 202 can locate the height of the welding surface.

[0041] Specifically, such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 5 As shown, the lifting structure 4 includes a support column 402, the inner side of the machine 1 is slidably connected to the support column 402, the outer side of the support column 402 is threadedly connected to a threaded sleeve 403, the threaded sleeve 403 is rotatably connected to the inner side of the machine 1, the top of the support column 402 is rollingly connected to a plurality of balls 406, the top of the support column 402 is in contact with the bottom side of the supporting plate 201 through the balls 406, the outer side of the threaded sleeve 403 is provided with a second tooth groove 405, the threaded sleeve 403 is meshed with a second bevel gear 404 through the second tooth groove 405, the side of the second bevel gear 404 is meshed with the first bevel gear 401, and the side of the first bevel gear 401 is rotatably connected to the machine 1;

[0042] As the threaded sleeve 403 rotates, the support column 402 can lift or lower the carrier plate 201 through the supporting effect of the ball 406 on the top side. The extension lines of the multiple laser pens 305 arranged on the positioning ring 202 are located at the same point and on the axis of the positioning ring 202. At this time, the user needs to adjust the height of the carrier plate 201 and the position of the workpiece on the carrier plate 201 until the convergence point of the light emitted by the laser pen 305 is located at the position to be welded of the welding workpiece. At this time, the position state of the workpiece on the carrier plate 201 is maintained, and then the cylindrical workpiece to be welded is fixed to the middle of the positioning ring 202 through the positioning structure 3, and the bottom end of the workpiece is made to conflict with the workpiece on the carrier plate 201, so as to complete the precise positioning of the welding position.

[0043] Specifically, such as Figure 1 、 Figure 2 、 Figure 10 、 Figure 11 、 Figure 12As shown, the welding structure 5 includes a guide groove 502. The guide groove 502 is opened in the middle of the machine 1. The machine 1 is slidably connected to a mounting slider 505 through the guide groove 502. The middle of the machine 1 is rotatably connected to an adjusting screw 501. The adjusting screw 501 is threadedly connected to the mounting slider 505. A mounting arm 504 is provided on the side of the mounting slider 505. A plasma welding gun 503 is installed at the end of the mounting arm 504. The end of the mounting arm 504 adjacent to the mounting slider 505 is located on the same horizontal plane as the end of the plasma welding gun 503.

[0044] The mounting arm 504 can adjust its horizontal position by rotating the adjusting screw 501 and sliding in the guide groove 502, which is convenient for welding workpieces of different diameters and adjusting the position of the plasma welding gun 503. Since the welding position of the workpiece has been adjusted in advance, after a certain horizontal movement, the end of the plasma welding gun 503 will be accurately aligned with the welding position of the workpiece. At this time, starting the motor to drive the drive shaft 203 to rotate can achieve synchronous rotation of the two workpieces. After the workpiece rotates one circle, the plasma welding gun 503 can complete the welding work between the two workpieces. Since all components are fixed in this process, the plasma welding gun 503 will accurately weld according to the welding path, thereby ensuring good welding quality.

[0045] Specifically, such as Figure 11 、 Figure 12 As shown, the adjustment structure 7 includes a second spring 701, the end of the mounting arm 504 is slidably connected to the mounting slider 505, the mounting arm 504 and the mounting slider 505 are fixedly connected with a second spring 701, the end of the mounting arm 504 is slidably connected to a positioning sleeve 702, the positioning sleeve 702 is rotatably connected to the inner side of the mounting slider 505, the positioning sleeve 702 is slidably connected to a positioning block 703 on both sides of the mounting arm 504, the positioning block 703 and the positioning sleeve 702 are fixedly connected with a third spring 704, the inner side of the mounting slider 505 is provided with a plurality of positioning teeth grooves 705, the end of the positioning block 703 is engaged with the mounting slider 505 through the positioning teeth grooves 705, the other end of the positioning block 703 is a hemispherical structure, and the spherical end of the positioning block 703 conflicts with the side surface of the mounting arm 504;

[0046] When the fixing plate 702 is in the closed position, the fixing plate 703 is in the closed position, and the fixing plate 703 is in the closed position, so that the fixing plate 703 is in the closed position.

[0047] Specifically, such as Figure 1 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 As shown, the bearing structure 6 includes a limit plate 602, and two limit plates 602 are rotatably connected to the two sides of the bearing plate 201. The limit plates 602 on both sides are symmetrically arranged, and the ends of the limit plates 602 are rotatably connected to the pushing plates 601. The ends of the pushing plates 601 are slidably connected to the control slide rods 603. The ends of the two control slide rods 603 on the same side are slidably connected to the inner sides of the adjustment blocks 604. The adjustment blocks 604 are slidably connected to the bearing plate 201. The two control slide rods 603 on the same side are slidably connected to the inner sides of the adjustment blocks 604. A first spring 605 is fixedly connected between the control slide bars 603. A release block 606 is slidably connected to the side of the adjustment block 604. Both sides of the release block 606 are inclined structures. The inclined side surfaces of the release block 606 are respectively slidably connected to the end of the control slide bar 603 on the same side. The other end of the control slide bar 603 is fixedly connected to a ratchet block 607. A ratchet groove 608 is formed on the inner side of the support plate 201. The ratchet block 607 is meshed with the support plate 201 through the ratchet groove 608.

[0048] The adjusting blocks 604 on both sides of the sliding carrier plate 201 allow the pushing plate 601 to push the limiting plate 602. At this time, the limiting plate 602 can be slightly lifted to rotate the limiting plate 602 to an inclined state. At this time, the angle of the limiting plate 602 can be changed by continuing to slide the adjusting blocks 604. After the limiting plates 602 on both sides are rotated to the same inclined angle, the user can place the workpiece between the limiting plates 602 on both sides. Due to the inclined structure of the limiting plate 602, it can provide good stability for cylindrical or other shaped workpieces, thereby ensuring welding. The process proceeds smoothly. A ratchet block 607 is provided at the end of the control slide bar 603 on the inner side of the pushing plate 601. The setting of the ratchet block 607 and the ratchet groove 608 enables the limit plate 602 to provide a stable support effect. When the position of the limit plate 602 needs to be restored, the user can press the release block 606 on the middle adjustment block 604 of the supporting plates 201 on both sides. The release block 606 pushes the control slide bars 603 on both sides through the inclined structures on both sides, so that the ratchet block 607 disengages from the ratchet groove 608. At this time, the limit plate 602 can be reset.

[0049] When the present invention is in use, first, when welding cylindrical workpieces, the user needs to place the two workpieces to be welded in the middle of the carrier plate 201 and the positioning ring 202 respectively. After completing the fixation of the workpieces, the motor installed on the side of the machine 1 drives the drive shaft 203 to rotate. At this time, through the traction effect of the first transmission belt 205 and the second transmission belt 209, the first transmission gear 206 and the second transmission gear 210 rotate synchronously, thereby simultaneously driving the positioning ring 202 and the driving sleeve 211 to rotate. The carrier plate 201 is slidably connected to the inner side of the driving sleeve 211. At this time, the carrier plate 201 and the positioning ring 202 can be rotated at the same angular velocity. Since the driving sleeve 211 and the positioning ring 202 are coaxially arranged, at this time The bottom end of the cylindrical workpiece fixed in the middle of the positioning ring 202 is brought into contact with the welding surface of the workpiece on the supporting plate 201 to make the two workpieces rotate synchronously. At this time, the welding equipment can complete the welding operation of the circular path in a fixed state to ensure a good welding effect. In order to fix the cylindrical welding workpiece through the positioning ring 202, a plurality of clamping rods 301 are threadedly connected to the side of the positioning ring 202. When fixing, the workpiece is placed inside the positioning ring 202, and then any clamping rod 301 is rotated. The clamping rod 301 will move inward. At the same time, through the transmission effect of the synchronous gear 304 and the gear ring 303, the other clamping rods 301 will rotate synchronously, so that the contact heads 302 at the ends of all clamping rods 301 are synchronized with the workpiece. The sides of the machine 1 are in contact with each other until the workpiece is clamped and fixed. Since the clamping rod 301 rotates synchronously, it can ensure that workpieces of any diameter can be fixed to the middle position of the positioning ring 202 and maintain a vertical state with the bottom side carrier plate 201. The laser pen 305 arranged on the side of the positioning ring 202 can locate the height of the welding surface. In order to ensure the calibration of the welding position, after placing another workpiece on the carrier plate 201, the height of the carrier plate 201 needs to be adjusted. The user can directly rotate the first bevel gear 401 on the side of the machine 1, and the threaded sleeve 403 can be driven to rotate through the second bevel gear 404. The support column 402 inside the threaded sleeve 403 is slidably connected to the machine 1. As the threaded sleeve 403 rotates, The support column 402 can lift or lower the carrier plate 201 through the supporting effect of the ball 406 on the top side. The extension lines of the multiple laser pointers 305 arranged on the positioning ring 202 are located at the same point and on the axis of the positioning ring 202. At this time, the user needs to adjust the height of the carrier plate 201 and the position of the workpiece on the carrier plate 201 until the convergence point of the light emitted by the laser pointer 305 is located at the position to be welded of the welding workpiece. At this time, the position state of the workpiece on the carrier plate 201 is maintained, and then the cylindrical workpiece to be welded is fixed to the middle of the positioning ring 202 by the positioning structure 3, and the bottom end of the workpiece is in conflict with the workpiece on the carrier plate 201, so that the precise positioning of the welding position can be completed. After the workpiece to be welded is fixed,The plasma welding gun 503 used for welding is installed on the mounting arm 504 in the middle of the machine 1. The mounting arm 504 can adjust the horizontal position by rotating the adjusting screw 501 and sliding in the guide groove 502, which is convenient for welding workpieces of different diameters. The position of the plasma welding gun 503 is adjusted. Since the welding position of the workpiece is adjusted in advance, after a certain horizontal movement, the end of the plasma welding gun 503 will be accurately aligned with the welding position of the workpiece. At this time, starting the motor to drive the drive shaft 203 to rotate can realize the synchronous rotation of the two workpieces. After the workpieces rotate one circle, the plasma welding gun 503 can complete the welding work between the two workpieces. Since all components are fixed in this process, the plasma welding gun 503 will be aligned according to the The welding path is accurately welded, thereby ensuring good welding quality. According to the shape, size, material and other characteristics of the welding workpiece, the user can adjust the welding angle of the plasma welding gun 503. The mounting arm 504 and the mounting slider 505 can be rotated, and the end of the plasma welding gun 503 is located on the rotating axis of the mounting arm 504, so that after the mounting arm 504 rotates, the welding position of the plasma welding gun 503 will not change. When adjusting the welding angle, the user first needs to pull the mounting arm 504 so that the end of the mounting arm 504 located on the mounting slider 505 slides away from the positioning sleeve 702. At this time, the spherical end of the positioning block 703 inside the positioning sleeve 702 will lose its resistance effect, and then the third spring 704 will be pressed against the mounting arm 504. The user can then rotate the mounting arm 504 to adjust the welding angle of the plasma welding gun 503. After the adjustment is completed, the mounting arm 504 is released. At this time, the end of the mounting arm 504 pushes the positioning block 703 again, so that the end of the positioning block 703 engages with the current positioning groove 705. At this time, the shell fixes the rotation angle of the current mounting arm 504 to meet different welding needs. When the supporting plate 201 is difficult to ensure the stable placement of the workpiece, the user can slide the adjustment blocks 604 on both sides of the supporting plate 201 so that the pushing plate 601 pushes the limiting plate 602. At this time, the limiting plate 602 can be slightly lifted to make the limiting plate 602 is rotated to the tilted state, and the sliding adjustment block 604 can be continued to change the angle of the limit plate 602. After the limit plates 602 on both sides are rotated to the same tilt angle, the user can place the workpiece between the limit plates 602 on both sides. Due to the inclined structure of the limit plates 602, good stability can be provided for cylindrical or partially other shaped workpieces, thereby ensuring smooth welding. The end of the control slide bar 603 on the inner side of the pushing plate 601 is provided with a ratchet block 607. The arrangement of the ratchet block 607 and the ratchet groove 608 enables the limit plate 602 to provide a stable support effect. When the position of the limit plate 602 needs to be restored, the user can press the release block 606 on the middle adjustment block 604 of the supporting plates 201 on both sides.The release block 606 pushes the control slide bars 603 on both sides through the inclined structures on both sides, so that the ratchet block 607 disengages from the ratchet groove 608, and the limit plate 602 can be reset at this time.

[0050] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0051] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A plasma arc welding machine, characterized in that: The machine comprises a platform (1), wherein a welding structure (5) is provided in the middle of the platform (1), a placement structure (2) is provided on the inner side of the platform (1), and a positioning structure (3) is provided on the top side of the placement structure (2); The placement structure (2) includes a bearing plate (201), the bearing plate (201) is rotatably connected to the machine (1), the bottom side of the bearing plate (201) is slidably connected to a driving sleeve (211), the top side of the bearing plate (201) is provided with a positioning ring (202), the positioning ring (202) is rotatably connected to the top side of the machine (1), the positioning ring (202) and the driving sleeve (211) are coaxially arranged and have equal diameters, and the positioning structure (3) includes a clamping rod (301), the side surface of the positioning ring (202) is threadedly connected to a plurality of clamping rods (301), and the angles between adjacent clamping rods (301) are equal.

2. A plasma arc welding machine according to claim 1, characterized in that: The side of the machine (1) is rotatably connected to a drive shaft (203), the top of the drive shaft (203) is fixedly connected to a first pulley (204), the side of the positioning ring (202) is provided with a first tooth groove (207), the side of the positioning ring (202) is meshed with a first transmission tooth (206) through the first tooth groove (207), the first transmission tooth (206) is rotatably connected to the inner side of the machine (1), and the first transmission tooth (206) and the first pulley (204) are connected. A first transmission belt (205) is sleeved, a second pulley (208) is fixedly connected to the bottom side of the drive shaft (203), a second transmission tooth (210) is meshed on the side of the drive sleeve (211), the second transmission tooth (210) is rotatably connected to the inner side of the machine (1), and the first transmission tooth (206) and the second transmission tooth (210) are coaxially arranged and have equal diameters, and a second transmission belt (209) is sleeved between the second transmission tooth (210) and the second pulley (208).

3. The plasma arc welding machine according to claim 1, characterized in that: The inner side of the positioning ring (202) is rotatably connected to a gear ring (303); the clamping rod (301) is slidably connected to a synchronous gear (304); the synchronous gear (304) and the gear ring (303) are meshed with each other, and the side surface of the synchronous gear (304) and the gear ring (303) are in contact with each other; the end of the clamping rod (301) is rotatably connected to a contact head (302); the outer side of the positioning ring (202) is obliquely installed with multiple laser pens (305); and the extension lines of the multiple laser pens (305) converge at the same point.

4. The plasma arc welding machine according to claim 1, characterized in that: A lifting structure (4) is provided on the bottom side of the placement structure (2), and the lifting structure (4) includes a support column (402). The inner side of the machine (1) is slidably connected to the support column (402), and the outer side of the support column (402) is threadedly connected to a threaded sleeve (403), and the threaded sleeve (403) is rotatably connected to the inner side of the machine (1).

5. The plasma arc welding machine according to claim 4, characterized in that: The top end of the support column (402) is rollingly connected to a plurality of balls (406), the top end of the support column (402) contacts the bottom side of the bearing plate (201) through the balls (406), the outer side of the threaded sleeve (403) is provided with a second tooth groove (405), the threaded sleeve (403) is meshed with a second bevel gear (404) through the second tooth groove (405), the side surface of the second bevel gear (404) is meshed with a first bevel gear (401), and the side surface of the first bevel gear (401) is rotationally connected to the machine platform (1).

6. The plasma arc welding machine according to claim 1, characterized in that: The welding structure (5) comprises a guide groove (502), a guide groove (502) is provided in the middle of the machine (1), the machine (1) is slidably connected to a mounting slide block (505) via the guide groove (502), an adjusting screw (501) is rotatably connected to the middle of the machine (1), the adjusting screw (501) and the mounting slide block (505) are threadedly connected, a mounting arm (504) is provided on the side of the mounting slide block (505), a plasma welding gun (503) is installed at the end of the mounting arm (504), and one end of the mounting arm (504) adjacent to the mounting slide block (505) is located on the same horizontal plane as the end of the plasma welding gun (503).

7. The plasma arc welding machine according to claim 6, characterized in that: An adjusting structure (7) is provided on the inner side of the welding structure (5), and the adjusting structure (7) includes a second spring (701). The end of the mounting arm (504) is slidably connected to the mounting slider (505). The second spring (701) is fixedly connected between the mounting arm (504) and the mounting slider (505). The end of the mounting arm (504) is slidably connected to a positioning sleeve (702), and the positioning sleeve (702) is rotatably connected to the inner side of the mounting slider (505).

8. The plasma arc welding machine according to claim 7, characterized in that: The positioning sleeve (702) is slidably connected to a positioning block (703) on both sides of the mounting arm (504), and a third spring (704) is fixedly connected between the positioning block (703) and the positioning sleeve (702). A plurality of positioning tooth grooves (705) are provided on the inner side of the mounting slider (505). The end of the positioning block (703) is engaged with the mounting slider (505) through the positioning tooth grooves (705). The other end of the positioning block (703) is in a hemispherical structure, and the spherical end of the positioning block (703) contacts the side surface of the mounting arm (504).

9. The plasma arc welding machine according to claim 1, characterized in that: The placement structure (2) is provided with a bearing structure (6), and the bearing structure (6) includes a limit plate (602). Two limit plates (602) are rotatably connected to the two sides of the bearing plate (201), and the limit plates (602) on both sides are symmetrically arranged. The ends of the limit plates (602) are rotatably connected to the pushing plates (601), and the ends of the pushing plates (601) are slidably connected to the control slide bars (603). The adjacent ends of the two control slide bars (603) on the same side are slidably connected to the inner side of the adjustment block (604), and the adjustment block (604) is slidably connected to the bearing plate (201).

10. The plasma arc welding machine according to claim 9, characterized in that: A first spring (605) is fixedly connected between the two control slide bars (603) on the same side, and a release block (606) is slidably connected to the side of the adjustment block (604). Both sides of the release block (606) are inclined surface structures. The inclined side surfaces on both sides of the release block (606) are respectively slidably connected to the end of the control slide bar (603) on the same side. The other end of the control slide bar (603) is fixedly connected to a ratchet block (607). A ratchet groove (608) is provided on the inner side of the support plate (201), and the ratchet block (607) is engaged with the support plate (201) through the ratchet groove (608).

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