Automatic welding workstation and welding method for elliptical connecting pipe

Abstract

The invention relates to the technical field of air cooler production, in particular to an automatic welding work station and welding method for oval connecting pipes, the automatic welding work station comprises two position changing machines, oval pipes to be welded are arranged on the position changing machines, the oval pipes are defined to extend in the left-right direction, and welding robots are arranged on the front sides of the oval pipes; a controller is arranged on the left side of the welding robot, a deflection assembly is arranged on each deflection machine and comprises a base, a profiling fixed gear is fixed to the base, a movable gear rotating around gear teeth of the profiling fixed gear in a meshed mode is arranged on the periphery of the profiling fixed gear, an end plate is fixed to the side, close to the oval pipe, of the movable gear, and a fixing device used for fixing the oval pipe is arranged on the end plate. The elliptical tube rotates and moves along with the movable gear, and the center of the movable gear coincides with the center of the elliptical tube; and by arranging the gear special for the oval connecting pipe, it is guaranteed that the position of the upper surface of the oval connecting pipe is not changed while the oval connecting pipe rotates, the welding stability is improved, and the robot welding programming difficulty is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of air cooler production, and particularly relates to an automatic welding workstation and a welding method for elliptical nozzles. Background Art

[0002] A high-pressure air cooler is an industrial heat exchange device that uses air for cooling and condensation, and is widely used in industries such as petrochemical, coal chemical, iron and steel metallurgy, and photovoltaic power. An elliptical reducer pipe is one of the important components used in the production of high-pressure air coolers. Currently, the welding methods for elliptical reducer pipes mainly include manual welding and robot welding.

[0003] For manual welding, mainly a welder operates the welding torch, and a positioner is used to clamp the reducer pipe for self-rotation. The welder manually adjusts the height of the welding torch to adapt to the change in the weld height difference (Δh) that occurs during the rotation of the elliptical pipe. When the elliptical nozzle rotates around its center, due to its major and minor axes, there is a height difference in the weld at its directly upper position. Therefore, the welding torch cannot remain stationary for welding, and the operator needs to constantly change the height of the welding torch to adapt to the change in the weld position caused by the rotation of the elliptical nozzle. So this method has high requirements for the welder's skills. The welder needs to constantly adjust the height of the welding torch and use oscillation to complete the welding. However, it is often impossible to adjust the height of the welding torch very promptly during the welding process, and arc interruption is likely to occur when welding the elliptical nozzle, resulting in quality problems such as uneven welds, bead undercutting, and lack of fusion after welding.

[0004] For robot welding, mainly through a teaching programming solution, the robotic arm and the positioner are coordinated to move, so that the end of the robotic arm always maintains a reasonable position relative to the weld, thereby achieving automatic welding. However, this method has complex programming. The main reason is that the programming languages of the robots on the market mainly have linear, circular arc, and full-circle motion modes for the movement trajectory. When the elliptical pipe rotates under the clamping of the positioner, the position of the welding point above it moves up and down reciprocally, and the change in Δh is not proportional to the rotation time. Therefore, the programming is difficult.

[0005] For example, a Chinese patent document with the authorization announcement number CN222059207U discloses a novel elliptical tube welding clamping device. The device includes a base. A chute is provided on the top surface of the base. At least one sliding plate is slidably connected inside the chute. A clamping mechanism is fixedly installed at the top of the sliding plate. An installation plate is fixedly installed at the top of the sliding rod. Among them, the clamping mechanism includes a fixing plate, a circular plate and a clamping ring. The bottom end of the fixing plate is fixedly installed at the top of the sliding plate. The circular plate is fixedly installed at the top of the fixing plate. The clamping ring is rotatably connected to the front side of the circular plate. In the present utility model, an electric push rod is used to push the clamping plate, and the clamping plate can be controlled to be adjusted according to the size of the elliptical tube, so as to more effectively fix the elliptical tube. By sliding the sliding plate in the chute, the pipe orifices of the two pipes are fitted together. By pulling the handle, the slider slides in the guiding groove, and then the clamping ring rotates, so as to achieve the purpose of turning over the elliptical tube, and it is more convenient to weld the interface of the pipe.

[0006] The above-mentioned welding clamping device realizes the manual turning of the elliptical tube during manual welding. However, when using this device for welding the elliptical tube, the distance between the welding torch and the weld seam still cannot be well maintained. The welding quality of the elliptical tube is greatly affected by the skills of the operators, and the welding quality is unstable. At the same time, the manual welding method has a low welding efficiency, which will reduce the production efficiency of the elliptical tube.

[0007] Therefore, in order to keep the same distance between the weld seam and the welding torch during the welding of the elliptical nozzle, it is necessary to design a position control device dedicated to the elliptical tube, so as to reduce the welding difficulty of the elliptical tube, ensure the welding quality of the elliptical tube, and improve the welding efficiency of the elliptical tube at the same time. Summary of the Invention

[0008] The present invention provides an elliptical nozzle welding tooling and its manufacturing method to solve the technical problems of poor manual welding quality and low welding efficiency of the existing elliptical variable-diameter tube.

[0009] To solve the above problems, an automatic welding workstation for an elliptical nozzle provided by the present invention adopts the following technical solutions: An automatic welding workstation for an elliptical nozzle includes two positioners. An elliptical tube to be welded is provided on each positioner. It is defined that the elliptical tube extends in the left-right direction. A welding device is provided on the front side of the two elliptical tubes. A controller is provided on the left side of the welding device. A positioning component is provided on each of the positioners. The positioning component includes a base. A profiling fixed gear is fixed on the base. A moving gear that meshes and rotates around its teeth is provided on the outer circumference of the profiling fixed gear. A end plate is fixed on the side of the moving gear close to the elliptical tube. A fixing device for fixing the elliptical tube is provided on the end plate, so that the elliptical tube rotates and moves along with the moving gear, and the center of the moving gear coincides with the center of the elliptical tube. When the moving gear rotates around the profiling fixed gear, it drives the elliptical tube to rotate. At this time, the shape of the profiling fixed gear satisfies that while the elliptical tube moves and rotates driven by the moving gear, the position of the tangent point on its upper surface is fixed in space.

[0010] The beneficial effects are as follows: In the existing welding of elliptical tubes, the welding is often carried out by rotating the pipe fittings and manually controlling the welding torch. However, due to the different lengths of the major axis and minor axis of the elliptical tube, the distance between the welding torch and the weld seam will change when the elliptical tube rotates, which results in the need to constantly adjust the position of the welding torch during welding to ensure the welding quality. However, it is often impossible to adjust the height of the welding torch very timely during the welding process, which leads to the phenomenon of arc breakage easily occurring when welding the elliptical tube, resulting in quality problems such as uneven welds, undercutting, and lack of fusion after welding.

[0011] By setting a profiling fixed gear with a specific shape on the positioner, the upper surface of the elliptical tube always intersects with a fixed tangent point during the rotary welding process, and thus has a fixed welding position, avoiding the problem that the relative position of the weld seam and the welding torch affects the welding quality when welding the elliptical tube. Compared with the manual welding method, it not only improves the welding quality and stability of the elliptical tube, but also improves the welding efficiency of the elliptical tube. In addition, the fixed position of the welding torch also reduces the programming difficulty of the welding device.

[0012] Further, a connecting rod extending left and right is provided between the moving gear and the end plate, and the connecting rod is fixedly connected to the corresponding moving gear and end plate respectively so that the end plate rotates and moves synchronously with the moving gear.

[0013] Further, a guiding groove is provided on the base and outside the profiling fixed gear. The guiding groove is adapted to the outer diameter of the profiling fixed gear, and an inner groove adapted to the connecting rod is also provided in the guiding groove to limit the moving path of the profiling fixed gear.

[0014] The beneficial effects are as follows: The design of the guiding groove and the inner groove limits the moving paths of the profiling fixed gear and the connecting rod, ensuring the accuracy of the elliptical tube during rotation and movement, and thus contributing to improving the accuracy and consistency of welding.

[0015] Further, a control motor is provided inside the base, and the output end of the control motor is fixedly connected to the connecting rod to drive the moving gear to rotate meshingly around the profiling fixed gear.

[0016] Further, the fixing device is an elliptical fixing plug, and the outer peripheral surface of the fixing plug fits with the inner peripheral surface of the elliptical tube so that the elliptical tube is inserted on the fixing plug in the left-right direction.

[0017] The beneficial effects are as follows: The fitting of the fixing plug with the inner peripheral surface of the elliptical tube enables the elliptical tube to be firmly inserted on the fixing plug. It not only improves the stability of the elliptical tube during the welding process, but also facilitates the quick replacement and positioning of the elliptical tube.

[0018] Further, the welding device is a six-axis welding robot.

[0019] Further, the two positioners are linked through a controller to control the synchronous rotation and movement of the two elliptical tubes.

[0020] The beneficial effects are as follows: The linked design of the controller realizes the synchronous rotation and movement of the two elliptical tubes, ensuring the relative position stability during the welding process. It improves the welding accuracy and consistency, and at the same time reduces the operation difficulty.

[0021] The beneficial effects of the automatic welding workstation for elliptical nozzles provided by the present invention are: 1. When welding existing elliptical tubes, it is often carried out by rotating the pipe fittings and manually controlling the welding torch. However, due to the different lengths of the major axis and minor axis of the elliptical tube, the distance between the welding torch and the weld seam will change when the elliptical tube rotates, which requires constantly adjusting the position of the welding torch during welding to ensure the welding quality. However, it is often impossible to adjust the height of the welding torch very timely during the welding process, which leads to the phenomenon of arc breakage when welding elliptical tubes, resulting in quality problems such as uneven welds, bead edge, and lack of fusion after welding.

[0022] By setting a profiling fixed gear with a specific shape on the positioner, the upper surface of the elliptical tube always intersects with the fixed tangent point during the rotary welding process, and thus has a fixed welding position, avoiding the problem that the relative position of the weld seam and the welding torch affects the welding quality when welding elliptical tubes. Compared with the manual welding method, it not only improves the welding quality and stability of the elliptical tube, but also improves the welding efficiency of the elliptical tube. In addition, the fixed position of the welding torch also reduces the programming difficulty of the welding device.

[0023] 2. The fixed plug fits with the inner peripheral surface of the elliptical tube, enabling the elliptical tube to be firmly inserted on the fixed plug. It not only improves the stability of the elliptical tube during the welding process, but also facilitates the quick replacement and positioning of the elliptical tube.

[0024] 3. The design of the guiding groove and the inner groove limits the movement paths of the profiling fixed gear and the connecting rod, ensuring the accuracy of the elliptical tube during rotation and movement, and thus contributing to improving the welding accuracy and consistency.

[0025] 4. The linked design of the controller realizes the synchronous rotation and movement of the two elliptical tubes, ensuring the relative position stability during the welding process. It improves the welding accuracy and consistency, and at the same time reduces the operation difficulty.

[0026] To solve the above problems, a welding method for elliptical nozzles provided by the present invention adopts the following technical solutions: A welding method for an elliptical nozzle, the specific steps are as follows: a. Select a suitable profiling fixed gear according to the model size of the elliptical pipe to be welded, and fix the profiling fixed gear on the bases of two positioners; b. Install the two elliptical pipes to be welded on the fixing devices of the positioners respectively, and the ends of the elliptical pipes are abutted against the end plates; c. Set the rotation and movement speeds of the moving gears on the positioners through the controller, so that the elliptical pipes move and rotate synchronously with the moving gears; d. Start the welding robot through the controller, place the welding torch of the welding robot above the tangent point of the elliptical pipe, and start the welding torch to realize the welding of the two elliptical pipes to be welded.

[0027] Its beneficial effects are as follows: By setting a profiling fixed gear with a specific shape on the positioner, the upper surface of the elliptical pipe always intersects with the fixed tangent point during the rotary welding process, so that there is a fixed welding position, avoiding the problem that the relative position of the weld seam and the welding torch changes during the welding of the elliptical pipe, which affects the welding quality. Compared with the manual welding method, it not only improves the welding quality and stability of the elliptical pipe, but also improves the welding efficiency of the elliptical pipe. In addition, the fixed welding torch position also reduces the programming difficulty of the welding device.

[0028] Furthermore, the fixing device is a replaceable fixing plug to adapt to elliptical pipes of different sizes.

[0029] Furthermore, the fixing plug has a fixed initial angle before welding to improve the feeding efficiency of the elliptical pipe during welding.

[0030] Its beneficial effects are as follows: The fixed initial angle of the fixing plug during welding helps to improve the feeding efficiency of the elliptical pipe during welding, simplifies the operation process, reduces the operation difficulty and cost. At the same time, the fixed initial angle also helps to improve the consistency and accuracy of welding.

[0031] The beneficial effects of the welding method for an elliptical nozzle provided by the present invention are: 1. By setting a profiling fixed gear with a specific shape on the positioner, the upper surface of the elliptical pipe always intersects with the fixed tangent point during the rotary welding process, so that there is a fixed welding position, avoiding the problem that the relative position of the weld seam and the welding torch changes during the welding of the elliptical pipe, which affects the welding quality. Compared with the manual welding method, it not only improves the welding quality and stability of the elliptical pipe, but also improves the welding efficiency of the elliptical pipe. In addition, the fixed welding torch position also reduces the programming difficulty of the welding device.

[0032] 2. The initial angle fixation of the fixed plug before welding helps improve the feeding efficiency of the elliptical tube during welding, simplifies the operation process, and reduces the operation difficulty and cost. At the same time, the fixed initial angle also helps improve the welding consistency and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features, and advantages of the exemplary embodiments of the present invention will become readily understood. In the drawings, several embodiments of the present invention are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein: Figure 1 is a schematic structural diagram of an automatic welding workstation for an elliptical nozzle provided by the present invention; Figure 2 is a front view of the positioning component; Figure 3 is a side view of the positioning component; Figure 4 is a schematic shape diagram of the profiling fixed gear; Figure 5 is a schematic flow diagram of a welding method for an elliptical nozzle provided by the present invention.

[0034] DESCRIPTION OF REFERENCE NUMERALS: 1. Positioning machine; 11. Base; 12. Profiling fixed gear; 13. Guide groove; 14. Inner groove; 15. Moving gear; 16. Link; 17. End plate; 18. Fixing device; 2. Elliptical tube; 3. Welding robot; 4. Wire barrel; 5. Controller; 6. Welding power source; 7. Positioning component. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Those skilled in the art should know that the following described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present invention.

[0036] The main concept of the present invention is to set a profiling fixed gear 12 with a specific shape on the positioning machine 1, so that the upper surface of the elliptical tube 2 always has a fixed welding position during the rotary welding process, avoiding the problem that the relative position of the weld seam and the welding torch changes during the welding of the elliptical tube 2, which affects the welding quality. Compared with the manual welding method, it not only improves the welding quality and stability of the elliptical tube 2, but also improves the welding efficiency of the elliptical tube 2. In addition, the fixed welding torch position also reduces the programming difficulty of the welding robot 3.

[0037] After introducing the basic principle of the present invention, various non-limiting embodiments of the present invention will be specifically introduced below. The number of any element in the drawings is for illustration rather than limitation, and any naming is only for distinction without any limiting meaning.

[0038] Reference will now be made to several representative embodiments of the present invention to elaborate in detail the principles and spirit of the present invention.

[0039] Embodiment 1 of an automatic welding workstation for elliptical nozzles provided by the present invention: As Figures 1 to 4 shown, the workstation includes two positioners 1 arranged oppositely, and an elliptical tube 2 is fixed on each of the two positioners 1. It is defined that the elliptical tube 2 extends in the left-right direction, and the two elliptical tubes 2 are respectively fixed on the opposite sides of the positioners 1. A welding robot 3 is provided on the front side of the two elliptical tubes 2, and the welding robot 3 is used to weld the two elliptical tubes 2. A controller 5 is provided on the left side of the welding robot 3, and the controller 5 is used to realize the linkage and automatic control of the welding robot 3 and the positioner 1. A positioning assembly 7 is provided on each of the two positioners 1, and the positioning assembly 7 is used to relatively fix the distance between the elliptical tube 2 and the welding gun.

[0040] The welding robot is a six-axis robot to adapt to the welding requirements of elliptical tubes 2 with different shapes and sizes and reduce the welding difficulty. A wire barrel 4 is provided between the welding robot 3 and the controller 5 to supply wire to the welding robot 3. A welding power source 6 is provided at the lower end of the controller 5, and the welding power source 6 is a digital pulse welding power source 6, which has high control accuracy and stability.

[0041] The positioning assembly 7 includes a base 11, and a control motor is provided inside the base 11, and the control motor is a servo motor. A profiling fixed gear 12 is fixed on the opposite sides of the two bases 11, and the profiling fixed gear 12 is a spur gear. The specific shape of the profiling fixed gear 12 is determined by the elliptical tube 2 to be welded, and the method is as follows: As Figure 4 shown, determine a horizontal line and a point on the horizontal line, and determine the tangent line and the tangent point of the elliptical cross-section of the elliptical tube 2 with this horizontal line and this point. On the premise that the cross-sectional ellipse is always tangent to the tangent line and the tangent point is always on the cross-sectional ellipse, make the cross-sectional ellipse rotate one week. At this time, the movement trajectory of the center of the cross-sectional ellipse is the shape of the profiling fixed gear 12. When the center of the elliptical tube 2 rotates around the profiling fixed gear 12, the upper surface of the elliptical tube 2 always intersects with this tangent point.

[0042] The derivation process of the movement trajectory of the center of the cross-sectional ellipse is as follows: Let the horizontal line be axis, the fixed point be , and the rotation angle of the ellipse be , the ellipse is translated while rotating to maintain: the ellipse is always tangent to the axis at the point, and the tangent at is always horizontal.

[0043] Let the semi-major axis of the ellipse be , the semi-major axis is along the initial axis direction, the semi-minor axis is b, and it is along the initial axis direction. At the initial position, the center of the ellipse is at , and is the lower vertex of the ellipse.

[0044] The direction angle of the ellipse represents the angle between the major axis and the axis. As varies from 0 to 360 degrees, the ellipse rotates one full circle.

[0045] Define the coordinates of the center of the ellipse as , which changes with during the rotation of the ellipse.

[0046] The point on the ellipse is parameterized in the local coordinate system as: , .

[0047] where is the parameter angle. After rotation, the global coordinates are: , .

[0048] The ellipse always passes through . Let the parameter corresponding to this point be . Substituting and into the global coordinates gives: , .

[0049] In addition, the tangent at the tangent point is always horizontal, that is, the normal vector is parallel to . The gradient of the ellipse at the local coordinate is: , After rotation, the normal vector is: , The normal vector is parallel to , then the component along the axis is 0, and we get: , Furthermore, we obtain:

[0050] Thus , .

[0051] Substitute and into and , we get: , .

[0052] From the above parametric equations, the shape of the profiling fixed gear 12 can be obtained, and when the parameters of the elliptical tube 2 change, the shape of the profiling fixed gear 12 changes correspondingly according to the above parametric equations.

[0053] On the outer periphery of both profiling fixed gears 12, there are moving gears 15 that rotate meshingly around the profiling fixed gears 12. The moving gears 15 are circular spur gears. The base 11 has a guiding groove 13, which is located outside the profiling fixed gear 12 and whose shape is adapted to that of the profiling fixed gear 12. The moving gear 15 is located in the guiding groove 13 to limit the rotation of the moving gear 15 around the profiling fixed gear 12 through the guiding groove 13.

[0054] At the right end of the left base 11 and the left end of the right base 11, there are end plates 17. The end plates 17 are circular plates arranged vertically. Between both end plates 17 and the corresponding bases 11, there are connecting rods 16. The connecting rods 16 are cylindrical rods extending left and right. One end of the connecting rod 16 is fixedly connected to the end plate 17, and the other end is fixedly connected to the corresponding moving gear 15. When the moving gear 15 moves and rotates around the profiling fixed gear 12 driven by the control motor, the end plate 17 also moves and rotates synchronously with the moving gear 15. An inner groove 14 is also provided in the guiding groove 13. The end of the connecting rod 16 connecting the moving gear 15 is inserted into the inner groove 14 and fixedly connected to the control motor. The inner groove 14 is used to further define the moving trajectory of the moving gear 15 and improve the moving accuracy of the moving gear 15.

[0055] At the right end of the left end plate 17 and the left end of the right end plate 17, there are fixedly provided fixing devices 18 for fixing the elliptical tube 2 on the end plate 17. The fixing device 18 is an elliptical fixing plug, and the shape of the fixing plug is adapted to the inner diameter of the elliptical tube 2, so that the elliptical tube 2 is sleeved on the fixing plug in the left - right direction, improving the stability of the elliptical tube 2 during the welding process and facilitating the quick replacement and positioning of the elliptical tube 2.

[0056] In addition, the center of the fixed plug coincides with the axis of the connecting rod 16. When the moving gear 15 rotates around the profiling fixed gear 12 driven by the control motor, the elliptical tube 2 fixed on the end plate 17 by the fixing device 18 rotates and moves synchronously with the moving gear 15. At this time, the upper surface of the elliptical tube 2 has a tangent point with a fixed position in space to maintain the relative fixation of the distance from the welding torch.

[0057] The working principle of this automatic welding workstation is as follows: The two elliptical tubes 2 to be welded are respectively sleeved on the fixed plugs of the two positioners 1, and then the controller 5 is used to control the welding robot 3 to move the welding torch above the butt joint of the two elliptical tubes 2, and the positioner 1 is started. At this time, driven by the control motor, the moving gear 15 rotates meshingly around the profiling fixed gear 12, and the guide groove 13 and the inner groove 14 limit the moving path of the moving gear 15, improving the moving accuracy of the moving gear 15. Then driven by the connecting rod 16, the two end plates 17 rotate and move synchronously with the corresponding moving gears 15, and at the same time the two elliptical tubes 2 also move synchronously. Since the two positioners 1 are linked through the controller 5, the two elliptical tubes 2 can rotate synchronously. In addition, since the profiling fixed gear 12 is customized according to the size of the elliptical tube 2, when the elliptical tube 2 rotates, its upper surface always intersects at a tangent point with a fixed position in space, and then the welding torch is started to complete the welding of the two elliptical tubes 2.

[0058] Embodiment 2 of an automatic welding workstation for elliptical nozzles provided by the present invention: The main difference from Embodiment 1 is that: In Embodiment 1, the automatic welding of the elliptical tube is carried out by a six-axis robot.

[0059] In this embodiment, the automatic welding of the elliptical tube is carried out by a five-axis robot or other multi-axis robots.

[0060] Embodiment 1 of a welding method for elliptical nozzles provided by the present invention: As shown in the figure, a welding method for elliptical nozzles provided by the present invention is mainly realized by the above-mentioned automatic welding workstation for elliptical nozzles. The specific steps are as follows: a. According to the model size of the elliptical tube 2 to be welded, select a suitable profiling fixed gear 12 and fix the profiling fixed gear 12 on the base plates 11 of the two positioners 1; b. Insert the two elliptical tubes 2 to be welded into the fixed plugs of the positioners 1 respectively, and then press the ends of the elliptical tubes 2 against the end plates 17. The fixed plugs are replaceable plugs to adapt to elliptical tubes 2 of different sizes; the fixed plugs have a fixed initial angle before welding to facilitate improving the feeding efficiency of the elliptical tube 2 during welding; c. Set the rotation and movement speeds of the driving gear 15 on the positioner 1 through the controller 5, so that the elliptical tube 2 moves and rotates synchronously with the driving gear 15; d. Start the welding robot 3 through the controller 5, place the welding torch of the welding robot 3 above the tangent point of the elliptical tube 2, and start the welding torch to realize the welding of two elliptical tubes 2 to be welded.

[0061] Embodiment 3 of a welding method for an elliptical nozzle provided by the present invention: The main difference from Embodiment 1 is that: In Embodiment 1, the driving gear and the baffle are synchronously moved and rotated through a connecting rod.

[0062] In this embodiment, the driving gear is fixed on the baffle.

[0063] According to the above description of this specification, those skilled in the art can also understand the following terms used, such as the terms indicating orientation or position relationship, such as "upper", "lower", "front", "rear", "left", "right", "width", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or position relationship shown in the drawings of this specification. It is only for the purpose of facilitating the description of the solution of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in the specific orientation. Therefore, the above orientation or position relationship terms cannot be understood or interpreted as a limitation to the solution of the present invention.

[0064] In addition, in the description of this specification, the meaning of "a plurality" is at least two, such as two, three or more, etc., unless otherwise specifically and clearly defined.

Claims

1. An automatic welding workstation for elliptical nozzles, comprising two positioners. Each positioner is provided with an elliptical tube to be welded. It is defined that the elliptical tube extends in the left - right direction. A welding device is arranged on the front side of the two elliptical tubes, and a controller is arranged on the left side of the welding device. It is characterized in that: Each of the positioners is provided with a positioning component. The positioning component includes a base. An imitation fixed gear is fixed on the base. A moving gear that meshes and rotates around its teeth is arranged on the outer periphery of the imitation fixed gear. A end plate is fixed on the side of the moving gear close to the elliptical tube. The end plate is provided with a fixing device for fixing the elliptical tube, so that the elliptical tube rotates and moves with the moving gear, and the center of the moving gear coincides with the center of the elliptical tube; When the moving gear rotates around the imitation fixed gear, it drives the elliptical tube to rotate. At this time, the shape of the imitation fixed gear satisfies that while the elliptical tube moves and rotates driven by the moving gear, the position of the tangent point on its upper surface is fixed in space.

2. The automatic welding workstation for elliptical nozzles according to claim 1, characterized in that A connecting rod extending left - right is arranged between the moving gear and the end plate. The connecting rod is fixedly connected to the corresponding moving gear and end plate respectively to make the end plate rotate and move synchronously with the moving gear.

3. The automatic welding workstation for an elliptical nozzle according to claim 2, characterized in that, On the base and outside the imitation fixed gear, there is a guiding groove. The guiding groove is adapted to the outer diameter of the imitation fixed gear. An inner groove adapted to the connecting rod is also arranged in the guiding groove to limit the moving path of the imitation fixed gear.

4. An automatic welding workstation for an elliptical nozzle according to claim 3, characterized in that, A control motor is arranged inside the base. The output end of the control motor is fixedly connected to the connecting rod to drive the moving gear to rotate meshingly around the imitation fixed gear.

5. An automatic welding workstation for an elliptical nozzle according to claim 1, characterized in that, The fixing device is an elliptical fixing plug. The outer peripheral surface of the fixing plug fits with the inner peripheral surface of the elliptical tube so that the elliptical tube is inserted onto the fixing plug in the left - right direction.

6. The automatic welding workstation for elliptical nozzles according to claim 1, characterized in that, The welding device is a six - axis welding robot.

7. An automatic welding workstation for an elliptical nozzle according to claim 1, characterized in that, The two positioners are linked through the controller to control the two elliptical tubes to rotate and move synchronously.

8. A welding method for an elliptical nozzle, characterized in that, It is implemented by using the automatic welding workstation for elliptical nozzles according to any one of claims 1 - 7. The specific steps are as follows: a. According to the model size of the elliptical tube to be welded, select a suitable imitation fixed gear and fix the imitation fixed gear on the bases of the two positioners; b. Install the two elliptical tubes to be welded on the fixing devices of the positioners respectively, and the end of the elliptical tube abuts against the end plate; c. Set the rotation and movement speeds of the moving gears on the positioners through the controller to make the elliptical tubes move and rotate synchronously with the moving gears; d. Start the welding robot through the controller, place the welding torch of the welding robot above the tangent point of the elliptical tube, and start the welding torch to realize the welding of the two elliptical tubes to be welded.

9. A welding method for an elliptical nozzle according to claim 8, characterized in that The fixing device is a replaceable fixing plug to adapt to elliptical tubes of different sizes.

10. A welding method for an elliptical nozzle according to claim 9, characterized in that, The fixing plug has a fixed initial angle before welding to improve the feeding efficiency of the elliptical tube during welding.

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