Automatic plasma welding device

Abstract

The plasma automatic welding device comprises a machine base, the inner side of an equipment frame is rotationally connected with an overturning box, and the inner side of the overturning box is rotationally connected with a clamping disc; a first linear motor for controlling the sliding connection frame to move horizontally is installed on the machine base, a second linear motor is installed on the vertical frame, a stepping motor is installed in the cross arm, and an arc length control piece is arranged in the shell sleeve. A wire moving mechanism is arranged in the wire feeding frame. According to the device, firstly, the overturning driving mechanism drives the overturning box to rotate, meanwhile, the driving part controls the clamping disc to rotate, the position of a welding seam of a welded workpiece is adjusted, the position of a welding gun can be adaptively adjusted according to the welding requirement of the workpiece, the flexibility of the device is improved, it is guaranteed that the welding seam is formed uniformly, and the quality of a welded part is improved; and secondly, through the arrangement of the arc length control piece, the arc of a welding spot is stabilized at a certain height, so that the purposes of uniform and attractive welding seam forming and improved strength are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of welding devices, and in particular to a plasma automatic welding device. Background Art

[0002] Plasma welding technology is a method of welding by using a plasma arc as a heat source. The plasma arc is the area in the arc where the temperature exceeds 3000°C. Through a specific compression effect, the arc energy is highly concentrated to form plasma. This high-temperature, high-energy-density plasma arc can be used in a variety of processes such as welding, cutting and surfacing.

[0003] With the development of industrial automation, automated welding technology is also constantly improving. During the welding process of a workpiece by a welding device, the position of the workpiece may change, including flat welding, vertical welding, horizontal welding and other different positions. Although the existing technology can adapt to these changes through appropriate angle adjustment of the welding gun connection mechanism, the position of the mechanism used to match the target workpiece clamping is mostly not convenient for precise adjustment according to the welding requirements of the workpiece, which makes it difficult for the existing plasma automatic welding device to adapt to the requirements of different welding positions and workpiece shapes.

[0004] In addition, it is difficult for the existing technology to automatically adjust the arc length according to the position of the welding surface. The change of arc length will affect the arc voltage, and then affect the welding current. The longer the arc, the higher the arc voltage; the shorter the arc, the lower the arc voltage. This change will affect the size of the welding current, and then affect the depth and width of the weld, thus affecting the shape and quality of the weld.

[0005] Based on the above-mentioned defects, a plasma automatic welding device is provided. Summary of the invention

[0006] The purpose of the present invention is to provide a plasma automatic welding device in order to solve the above problems.

[0007] In order to achieve the above-mentioned object, the present invention adopts the following technical scheme: a plasma automatic welding device, comprising a machine base, two equipment racks are fixedly arranged on the upper end of the machine base, a turning box is rotatably connected to the inner side of the equipment rack, a clamping disk is rotatably connected to the inner side of the turning box, a driving member for controlling the rotation of the clamping disk is installed at the outer end of the turning box, and a turning driving mechanism for controlling the rotation of the turning box is installed on the equipment rack; The side end of the machine base is slidably connected with a sliding frame, a first linear motor for controlling the horizontal movement of the sliding frame is installed on the machine base, a vertical frame is fixedly provided at the upper end of the sliding frame, a cross arm is vertically slidably connected to the outer side of the vertical frame, a second linear motor for controlling the vertical movement of the cross arm is installed on the vertical frame, a shell is rotatably connected to one side of the cross arm, a stepper motor for controlling the rotation of the shell is installed in the cross arm, a welding gun connecting mechanism is fixedly provided at one end of the shell back to the cross arm, and an arc length control member for controlling the movement of the welding gun connecting mechanism is provided in the shell; A wire reel and a wire feeding frame are fixedly arranged on the cross arm, a wire feeding tube for conveying welding wire is installed on the wire feeding frame, and a wire feeding mechanism is arranged in the wire feeding frame.

[0008] Preferably, the driving member comprises a gear ring rotatably connected in the flip box and fixed to the clamping disk, a gear meshing with the gear ring is rotatably connected in the middle of the flip box, and a servo motor for controlling the rotation of the gear is installed at the outer end of the flip box.

[0009] Preferably, a pointer coaxially fixed with the flip box is rotatably connected to the outer side of one of the equipment racks, and a dial used in conjunction with the pointer is formed on the side wall of the equipment rack.

[0010] Preferably, an accordion shield is installed on the outer side of the stand to shield the cross arm slide.

[0011] Preferably, the arc length control member comprises a screw sleeve slidably connected in the shell and fixed to the welding gun connection mechanism, a threaded rod rotatably connected in the shell and screwed together with the screw sleeve, and a screw motor for controlling the rotation of the threaded rod is installed at the bottom of the shell.

[0012] Preferably, the wire feeding mechanism includes two wire feeding wheels rotatably connected to the inner side of the wire feeding frame, and a pressure feeding assembly cooperating with the wire feeding wheels to straighten the welding wire, and a assembly for controlling the rotation of the wire feeding wheels is installed on the wire feeding frame.

[0013] Preferably, the pressure-feeding assembly includes two shells rotatably connected to the wire feeding frame, and a limiting fitting acting on the shells, a pressure wheel corresponding to the wire feeding wheel is rotatably connected to the shells, and the wire feeding frame is fixed with a shaft rod rotatably connected to the shells, and the outer side of the shaft rod is sleeved with a torsion spring which drives the pressure wheel to lift away from the wire feeding wheel by compressing the shells.

[0014] Preferably, the position-limiting fitting comprises a rotary rod rotatably connected to the wire feeding frame, a handle is fixedly provided on the rotary rod, and a groove is formed in the housing frame for the rotary rod to penetrate and rotate.

[0015] Preferably, the component for controlling the rotation of the wire feeding wheel includes a driving wheel rotatably connected to the wire feeding frame, a driving motor for controlling the rotation of the driving wheel is installed at the outer end of the cross arm, a driven wheel coaxially fixed with the wire feeding wheel is rotatably connected to the wire feeding frame, and the driven wheel is meshingly connected to the driving wheel.

[0016] Preferably, a toothed disc coaxially fixed with the pressure wheel is rotatably connected to the housing frame, and when the pressure wheel is pressed toward the wire feeding wheel along with the housing frame, the toothed disc meshes with the driven wheel.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. In the present application, the turning box is driven to rotate by the turning drive mechanism, so that the workpiece can be stably positioned at any position within the range of 0 to 90 degrees. At the same time, the rotation of the clamping plate is controlled by the driving member to adjust the position of the weld of the welding workpiece, so as to meet the circumferential welding processing of the annular weld of the tubular workpiece by the device, and the position of the welding gun can also be adjusted according to the welding requirements of the workpiece, thereby improving the flexibility of the device, ensuring uniform weld formation and improving the quality of the welded parts.

[0018] 2. In the present application, by setting the arc length control part, the arc length can be automatically adjusted to control the distance between the tungsten electrode tip and the welded point to be constant, and stabilize the welding point arc at a certain height, so as to achieve the purpose of making the weld uniform, beautiful and strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the front three-dimensional structure of a welding device provided in an embodiment of the present invention is shown; Figure 2 A schematic diagram of the side perspective structure of a welding device provided in an embodiment of the present invention is shown; Figure 3 It shows a schematic diagram of the internal structure of a rollover box provided according to an embodiment of the present invention; Figure 4 A schematic diagram of the three-dimensional structure of a stand provided according to an embodiment of the present invention is shown; Figure 5 A schematic diagram of the three-dimensional structure of a wire feeding frame provided according to an embodiment of the present invention is shown; Figure 6 A schematic cross-sectional structure diagram of a cross arm and a shell sleeve provided according to an embodiment of the present invention is shown.

[0020] Legend: 1. Machine base; 2. Equipment frame; 3. Flip box; 4. Pointer; 5. Dial; 6. Flip drive mechanism; 7. Clamping plate; 8. Servo motor; 9. Gear; 10. Gear ring; 11. Sliding frame; 12. First linear motor; 13. Vertical frame; 14. Cross arm; 15. Second linear motor; 16. Organ cover; 17. Shell; 18. Stepper motor; 19. Welding gun connection mechanism; 20. Screw sleeve; 21. Screw motor; 22. Threaded rod; 23. Wire feed frame; 24. Wire feed tube; 25. Driving wheel; 26. Driving motor; 27. Wire feed wheel; 28. Shaft rod; 29. ​​Shell; 30. Torsion spring; 31. Pressure wheel; 32. Groove; 33. Rotary rod; 34. Handle; 35. Driven wheel; 36. Wire reel. DETAILED DESCRIPTION

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

[0022] See also Figure 1-Figure 6 The present invention provides a technical solution: a plasma automatic welding device, including a machine base 1, two equipment frames 2 are fixedly arranged on the upper end of the machine base 1, the inner side of the equipment frame 2 is rotatably connected to a turning box 3, the inner side of the turning box 3 is rotatably connected to a clamping plate 7, the outer end of the turning box 3 is equipped with a driving member for controlling the rotation of the clamping plate 7, and the equipment frame 2 is equipped with a turning driving mechanism 6 for controlling the rotation of the turning box 3.

[0023] The flipping drive mechanism 6 is an existing technology, driven by a Y series motor, which is decelerated by a two-stage worm gear reducer to drive the flip box 3 to rotate, and the output flipping speed is 0.03-3rpm. Since the worm gear reducer has a strong self-locking property, it can stably position the workpiece at any position within the range of ±90°. Since the flipping mechanism is fixed inside the frame, the entire device looks more compact.

[0024] The panel of the clamping plate 7 is equipped with a mechanical three-jaw chuck to clamp and position the workpiece so that the workpiece can be centered when the workpiece is automatically welded. The clamping plate 7 is controlled to rotate by a driving member to adjust the position of the weld seam of the welded workpiece, so that the device can perform circumferential welding of the annular weld seam of the tubular workpiece.

[0025] A sliding frame 11 is slidably connected to the side end of the machine base 1, and a first linear motor 12 for controlling the horizontal movement of the sliding frame 11 is installed on the machine base 1. A vertical frame 13 is fixedly provided on the upper end of the sliding frame 11, and a cross arm 14 is vertically slidably connected to the outer side of the vertical frame 13. A second linear motor 15 for controlling the vertical movement of the cross arm 14 is installed on the vertical frame 13. A shell sleeve 17 is rotatably connected to one side of the cross arm 14, and a stepper motor 18 for controlling the rotation of the shell sleeve 17 is installed in the cross arm 14. A welding gun connecting mechanism 19 is fixedly provided at one end of the shell sleeve 17 facing away from the cross arm 14, and an arc length control component for controlling the movement of the welding gun connecting mechanism 19 is provided in the shell sleeve 17.

[0026] The welding gun connection mechanism 19 is a prior art, and is composed of a ceramic nozzle, a tungsten electrode, a tungsten electrode clamp, a diverter, a TIG welding gun, a welding gun adjustment slide assembly, a water, electricity and gas quick change assembly and other components.

[0027] The first linear motor 12 and the second linear motor 15 are prior art, and they are usually composed of a fixed part (stator) and a moving part (motor), and generate linear motion through the interaction of electromagnetic fields. The first linear motor 12 controls the sliding frame 11 to move in the horizontal direction, and adjusts the horizontal position of the welding gun connection mechanism 19. The second linear motor 15 controls the cross arm 14 to move in the vertical direction, and adjusts the vertical position of the welding gun connection mechanism 19, so as to meet the requirements of adaptive processing of workpieces of different sizes and different positions of the workpiece.

[0028] The stepper motor 18 controls the shell 17 to rotate, so as to realize the swing of the welding gun connection mechanism 19, and the arc length control part is used to adjust the arc length of the welding gun connection mechanism 19. The arc length control part can control the distance between the tungsten tip and the welding point to be constant, stabilize the welding point arc at a certain height, so as to achieve the purpose of making the weld uniform, beautiful and strong.

[0029] The arc length control unit is equipped with an automatic arc length control system (arc length tracking system): the system is implemented based on the principle of arc voltage signal feedback collected by the welding power supply. The welding power supply feeds back the arc voltage change between the tungsten electrode and the welded surface to the motor driver in the form of an electrical signal, and then the motor switches to linear motion to drive the axial movement of the welding torch to maintain a stable distance between the tungsten electrode and the welded surface, and automatically adjusts the arc length.

[0030] A wire reel 36 and a wire feeding frame 23 are fixedly provided on the cross arm 14 . A wire feeding tube 24 for conveying welding wire is installed on the wire feeding frame 23 . A wire feeding mechanism is provided in the wire feeding frame 23 .

[0031] The wire reel 36 is used for winding the welding wire for standby use. The welding wire enters the wire feeding frame 23 from the inlet and is then introduced into the wire feeding tube 24 through the wire feeding mechanism.

[0032] Due to the different diameters of welding wires, the wire feed wheel 27 needs to be frequently replaced. The wire feed wheel 27 is assembled and disassembled by unscrewing the fixing nut (or screw), removing the wire feed wheel 27 to adjust the surface or replace the wire feed wheel 27, and then assembling it on the wheel shaft and tightening it with the fixing nut (or screw). The protective grease of the wire feed wheel 27 should be cleaned when in use to prevent slipping.

[0033] Specifically, Figure 2 and Figure 3 As shown, the driving member includes a gear ring 10 rotatably connected in the flip box 3 and fixed to the clamping plate 7, a gear 9 meshing with the gear ring 10 is rotatably connected in the middle of the flip box 3, and a servo motor 8 for controlling the rotation of the gear 9 is installed at the outer end of the flip box 3.

[0034] The gear 9 is controlled to rotate by the servo motor 8, so that the gear ring 10 meshing with the gear 9 drives the clamping plate 7 to rotate. The gear 9 drives the gear ring 10, so that the middle of the clamping plate 7 is designed to be through. This satisfies the penetration of the long tube, so that the weight distribution of the long tube is uniform when it is fixed relative to the clamping plate 7, which is conducive to the stable installation of the long tube.

[0035] Specifically, Figure 2-Figure 5 As shown, a pointer 4 coaxially fixed with a flip box 3 is rotatably connected to the outer side of one of the equipment racks 2, and a dial 5 used in conjunction with the pointer 4 is formed on the side wall of the equipment rack 2; an accordion shield 16 is installed on the outer side of the vertical frame 13 to shield the slide of the cross arm 14.

[0036] The synchronous rotation of the pointer 4 with the turning box 3 can help the staff to know the turning angle in time and accurately, which is convenient for positioning the workpiece; secondly, it can ensure that the turning angle range will not be exceeded during turning to avoid danger, thus playing a role in protecting the equipment.

[0037] Specifically, Figure 4 and Figure 5 As shown, the arc length control member includes a screw sleeve 20 which is slidably connected in the shell 17 and fixed to the welding gun connecting mechanism 19, a threaded rod 22 which is rotatably connected in the shell 17 and screwed together with the screw sleeve 20, and a screw motor 21 which controls the rotation of the threaded rod 22 is installed at the bottom of the shell 17.

[0038] The screw motor 21 is started to control the threaded rod 22 to rotate, thereby driving the threaded sleeve 20 screwed together with the threaded rod 22 to drive the welding gun connecting mechanism 19 to move in the vertical direction.

[0039] Specifically, Figure 3-Figure 6 As shown, the wire feeding mechanism includes two wire feeding wheels 27 rotatably connected to the inner side of the wire feeding frame 23, and a pressure feeding assembly that cooperates with the wire feeding wheels 27 to straighten the welding wire. The wire feeding frame 23 is equipped with an assembly for controlling the rotation of the wire feeding wheels 27.

[0040] The pressure-feeding assembly includes two shell frames 29 rotatably connected to the wire feeding frame 23, and a limiting fitting acting on the shell frames 29. A pressure wheel 31 corresponding to the wire feeding wheel 27 is rotatably connected to the shell frames 29. The wire feeding frame 23 is fixed with a shaft rod 28 rotatably connected to the shell frames 29. The outer side of the shaft rod 28 is sleeved with a torsion spring 30 which drives the pressure wheel 31 to lift away from the wire feeding wheel 27 by pressing the shell frames 29.

[0041] When the staff is threading the wire, they first release the pressing state of the shell frame 29 through the limiting fittings. At this time, the shell frame 29 drives the pressing wheel 31 to automatically bounce upward under the action of the torsion spring 30, so that the welding wire enters the groove of the wire feeding wheel 27 and passes through the wire feeding tube 24, and then the limiting fittings are restored to their original position. By controlling the rotation of the wire feeding wheel 27, the welding wire will be automatically fed through the wire feeding tube 24. If the welding wire cannot be fed out normally, this is because a large angle is generated in a short distance. It is not a fault. The wire outlet nozzle at the front of the wire feeding tube 24 can be unscrewed and the wire outlet nozzle can be screwed on after the wire is fed out.

[0042] The position-limiting fitting includes a rotating rod 33 rotatably connected to the wire feeding frame 23, a handle 34 is fixed on the rotating rod 33, and a groove 32 is formed in the housing frame 29 to cooperate with the rotating rod 33 to penetrate and rotate. The assembly for controlling the rotation of the wire feeding wheel 27 includes a driving wheel 25 rotatably connected to the wire feeding frame 23, a driving motor 26 for controlling the rotation of the driving wheel 25 is installed at the outer end of the cross arm 14, and a driven wheel 35 coaxially fixed to the wire feeding wheel 27 is rotatably connected to the wire feeding frame 23, and the driven wheel 35 is meshed with the driving wheel 25. A toothed disc coaxially fixed to the pressure wheel 31 is rotatably connected to the housing frame 29, and when the pressure wheel 31 is pressed toward the wire feeding wheel 27 along with the housing frame 29, the toothed disc meshes with the driven wheel 35.

[0043] By pulling the handle 34 downward, the rotating rod 33 fixed to the handle 34 slides out of the housing frame 29 along the groove 32, and the pressing restriction on the housing frame 29 is released. At this time, the housing frame 29 is automatically lifted upward under the action of the torsion spring 30. The diameter of the adjustment handle 34 is larger than the width of the groove 32, so that the adjustment handle 34 can press the end of the housing frame 29 after being lifted upward, thereby limiting the rotation of the housing frame 29 and ensuring that the pressure wheel 31 cooperates with the wire feeding wheel 27 to stably transport the welding wire.

[0044] The driving motor 26 is started to control the driving wheel 25 to rotate, so that the two driven wheels 35 meshing with the driving wheel 25 drive the wire feeding wheel 27 to rotate synchronously in the same direction. At the same time, the toothed disc meshing with the driven wheel 35 drives the pressure wheel 31 to rotate in the opposite direction relative to the wire feeding wheel 27, so as to realize the automatic output of the welding wire sandwiched between the pressure wheel 31 and the wire feeding wheel 27. Both the driven wheel 35 and the driving wheel 25 are gear structures.

[0045] The above description of the embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A plasma automatic welding device, comprising a machine base (1), characterized in that: Two equipment frames (2) are fixedly provided at the upper end of the machine base (1); a turning box (3) is rotatably connected to the inner side of the equipment frame (2); a clamping plate (7) is rotatably connected to the inner side of the turning box (3); a driving member for controlling the rotation of the clamping plate (7) is installed at the outer end of the turning box (3); and a turning driving mechanism (6) for controlling the rotation of the turning box (3) is installed on the equipment frame (2); The side end of the machine base (1) is slidably connected to a sliding frame (11), a first linear motor (12) for controlling the horizontal movement of the sliding frame (11) is installed on the machine base (1), a vertical frame (13) is fixedly provided on the upper end of the sliding frame (11), a horizontal arm (14) is vertically slidably connected to the outer side of the vertical frame (13), a second linear motor (15) for controlling the vertical movement of the horizontal arm (14) is installed on the vertical frame (13), one side of the horizontal arm (14) is rotatably connected to a shell (17), a stepping motor (18) for controlling the rotation of the shell (17) is installed in the horizontal arm (14), a welding gun connecting mechanism (19) is fixedly provided on one end of the shell (17) facing away from the horizontal arm (14), and an arc length control member for controlling the movement of the welding gun connecting mechanism (19) is provided in the shell (17); A wire reel (36) and a wire feeding frame (23) are fixedly provided on the cross arm (14); a wire feeding tube (24) for conveying welding wire is installed on the wire feeding frame (23); and a wire feeding mechanism is provided in the wire feeding frame (23).

2. The plasma automatic welding device according to claim 1, characterized in that: The driving member comprises a toothed ring (10) rotatably connected in the turning box (3) and fixed to the clamping plate (7); a gear (9) rotatably connected in the middle of the turning box (3) and meshing with the toothed ring (10); and a servo motor (8) for controlling the rotation of the gear (9) is installed at the outer end of the turning box (3).

3. The plasma automatic welding device according to claim 1, characterized in that: A pointer (4) coaxially fixed to the turning box (3) is rotatably connected to the outer side of one of the equipment racks (2), and a dial (5) used in conjunction with the pointer (4) is formed on the side wall of the equipment rack (2).

4. The plasma automatic welding device according to claim 1, characterized in that: An accordion shield (16) is installed on the outer side of the stand (13) to shield the slideway of the cross arm (14).

5. The plasma automatic welding device according to claim 1, characterized in that: The arc length control member comprises a threaded sleeve (20) which is slidably connected in a shell (17) and fixed to a welding gun connection mechanism (19); a threaded rod (22) which is rotatably connected in the shell (17) and is screwed to the threaded sleeve (20); and a screw motor (21) which controls the rotation of the threaded rod (22) is installed at the bottom of the shell (17).

6. The plasma automatic welding device according to claim 1, characterized in that: The wire feeding mechanism comprises two wire feeding wheels (27) rotatably connected to the inner side of a wire feeding frame (23), and a pressure feeding assembly cooperating with the wire feeding wheels (27) to straighten the welding wire. The wire feeding frame (23) is provided with an assembly for controlling the rotation of the wire feeding wheels (27).

7. The plasma automatic welding device according to claim 6, characterized in that: The pressure-feeding assembly comprises two shell frames (29) rotatably connected to the wire feeding frame (23), and a limiting fitting acting on the shell frames (29); a pressure wheel (31) corresponding to the wire feeding wheel (27) is rotatably connected to the shell frames (29); a shaft (28) rotatably connected to the shell frames (29) is fixed in the wire feeding frame (23); a torsion spring (30) is sleeved on the outer side of the shaft (28) for pressing the shell frames (29) to drive the pressure wheel (31) to lift away from the wire feeding wheel (27).

8. The plasma automatic welding device according to claim 7, characterized in that: The position-limiting fitting comprises a rotary rod (33) rotatably connected to the wire feeding frame (23), a handle (34) being fixedly provided on the rotary rod (33), and a groove (32) cooperating with the rotary rod (33) to penetrate and rotate is formed in the housing (29).

9. The plasma automatic welding device according to claim 7, characterized in that: The component for controlling the rotation of the wire feeding wheel (27) comprises a driving wheel (25) rotatably connected to the wire feeding frame (23); a driving motor (26) for controlling the rotation of the driving wheel (25) is mounted on the outer end of the cross arm (14); a driven wheel (35) coaxially fixed with the wire feeding wheel (27) is rotatably connected to the wire feeding frame (23), and the driven wheel (35) is meshingly connected to the driving wheel (25).

10. The plasma automatic welding device according to claim 9, characterized in that: A toothed disc coaxially fixed to the pressure wheel (31) is rotatably connected to the housing frame (29); when the pressure wheel (31) is pressed toward the wire feeding wheel (27) along with the housing frame (29), the toothed disc meshes with the driven wheel (35).

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