A welding device for valve assembly

Abstract

The application discloses a kind of welding devices of valve combination for facilitating positioning, it is related to welding technical field;Specifically including: welding assembly installed on the top of bearing base, ranging positioning assembly, valve clamping assembly and the total control box for controlling overall device;Welding assembly includes the transverse base with transmission threaded rod internally threaded, the top of transverse base is fixedly installed with lifting cylinder, the top of lifting cylinder is fixedly installed with bearing support, the top of bearing support is fixedly installed with automatic wire feeding welding gun.The application automatically calculates the movement path of welding gun through infrared ranging data, avoids collision with workpiece, facilitates the relative position of welding place between valve body and flange and welding gun to be positioned quickly;Through the distance data of real-time feedback welding assembly and workpiece, combined with the closed-loop control algorithm of total control box, welding gun position dynamic compensation is realized;And through intermittent welding, heat input is optimized, deformation is reduced, and welding quality is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and in particular to a welding apparatus for valve assemblies that is easy to position. Background Technology

[0002] The welding work of valves mainly involves the valve body and flange. During welding, the valve body and flange are joined together, and then workers use welding guns, welding rods and other equipment to weld the valve body and flange.

[0003] A search revealed Chinese patent application number 202411271673.0, which discloses a welding machine for valve assembly. By inserting a welding rod into the gap between the flange and the valve body for welding, the welding strength and quality of the mating surfaces can be effectively improved, enabling comprehensive and effective welding of the valve and improving the valve processing quality. The machine achieves automated welding by using a main ring to drive the welding rod in a circular motion and a slide table to move on the base and feed the welding rod, thus improving production efficiency. In summary, this novel welding machine design overcomes the limitations of traditional welding methods, improves welding quality and production efficiency, and reduces costs, representing an effective technological innovation.

[0004] The valve assembly welding machine in the aforementioned patent has the following shortcomings: In actual use, the device lacks a positioning structure, making it difficult to quickly position the relative position of the welding point between the valve body and the flange and the welding torch. This means that the entire device needs to be adjusted after the valve body and flange are installed so that the welding point corresponds to the welding torch. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and to propose a welding device for valve assembly that is easy to position.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A welding apparatus for easy positioning of valve assemblies, comprising:

[0008] The welding assembly, the ranging and positioning assembly, the valve clamping assembly, and the main control box for controlling the overall device are installed on the top of the support base.

[0009] The welding assembly includes a transverse base with a transmission thread rod internally threaded on it, a lifting cylinder fixedly installed at the top of the transverse base, a bearing support fixedly installed at the top of the lifting cylinder, and an automatic wire feeding welding gun fixedly installed at the top of the bearing support.

[0010] The main body of the ranging and positioning component is a bearing base. A servo motor is fixedly installed inside the bearing base, and a lifting threaded rod is fixedly installed at the top of the output shaft of the servo motor. A lifting connecting seat is threaded on the outer wall of the lifting threaded rod, and a laser rangefinder is fixedly installed on one side of the lifting connecting seat.

[0011] The main body of the valve clamping assembly is a rotating connecting plate. Multiple mounting slots are fixedly installed at equal intervals on the top of the rotating connecting plate. A flange to be welded is provided on the top of the multiple mounting slots. A valve body to be welded is provided on the top of the flange to be welded. A stable clamping unit is provided inside the valve body to be welded.

[0012] The main body of the stabilizing clamping unit is configured as a central threaded rod. An internal threaded cylinder is threadedly installed on the outer wall of the central threaded rod. A fixing ring is fixedly connected to the outer wall of the internal threaded cylinder. Multiple guide arms and multiple rotating positioning seats are integrally formed at equal intervals on the outer wall of the fixing ring. A clamping crank arm is rotatably installed inside the rotating positioning seat. The bottom end of the clamping crank arm is configured as a spherical head. An internal threaded cylinder is threadedly installed on the top of the outer wall of the central threaded rod. A connecting cylinder is rotatably installed on the outer wall of the internal threaded cylinder. Multiple guide arms and multiple clamping positioning seats are integrally formed at equal intervals on the outer wall of the connecting cylinder. A clamping pin is fixedly installed inside the clamping positioning seat. The clamping pin is slidably installed on the upper part of the clamping crank arm.

[0013] The laser emission direction of the laser rangefinder coincides with and is perpendicular to the vertical axis of the rotating connecting disk, and the distance from the laser emission point of the laser rangefinder to the vertical axis of the rotating connecting disk is the same as the distance from the automatic wire feeding welding gun to the vertical axis of the rotating connecting disk.

[0014] As a preferred embodiment of the present invention: both ends of the transmission threaded rod are rotatably mounted with limit end plates, and both ends between the two limit end plates are fixedly mounted with guide slide rods, the guide slide rods passing through the transverse base and slidably connected to the transverse base.

[0015] Based on the aforementioned scheme: a servo motor is provided at one end of the transmission threaded rod, a reducer is installed on the output shaft of the servo motor, the reducer is connected to the transmission threaded rod, an infrared rangefinder is fixedly installed at one end of the top of the transverse base, and an infrared reflector is correspondingly installed at the top of one of the limiting end plates.

[0016] As a preferred embodiment of the present invention: a fixed base plate is fixedly connected to the bottom end of the bearing seat, and a mounting top cover is fixedly installed at the top end of the bearing seat. A protective opening cylinder is fixedly connected to the top end of the mounting top cover, and the lifting connecting seat is slidably installed inside the protective opening cylinder.

[0017] As a preferred embodiment of the present invention: a limiting ring seat is rotatably mounted on the bottom end of the rotating connecting plate, a connecting seat plate is fixedly mounted on the bottom end of the limiting ring seat, and an mounting base is fixedly mounted on the bottom end of the connecting seat plate.

[0018] As a preferred embodiment of the present invention: a limiting slider is slidably installed inside the mounting groove, and a limiting threaded rod is rotatably installed inside the mounting groove, with a driven bevel gear fixedly installed at one end of the limiting threaded rod.

[0019] As a preferred embodiment of the present invention: a rotating support column is rotatably mounted on the top of the rotating connecting disk, a rotating mounting platform is fixedly connected to the top of the rotating support column, and a connecting bevel gear that meshes with the driven bevel gear is fixedly mounted on the outer wall of the rotating mounting platform.

[0020] Based on the aforementioned scheme: a second servo motor is provided between the main control box and the mounting base, a drive bevel gear is fixedly installed on the output shaft of the second servo motor, and a driven bevel gear ring meshing with the drive bevel gear is fixedly installed in the middle of the outer wall of the rotating connecting plate.

[0021] As a preferred embodiment of the present invention: the ends of the first guide arm and the second guide arm are slidably mounted with guide columns via linear bearings, the bottom end of the guide column is fixedly mounted with a column fixing seat, and the column fixing seat is fixedly mounted on the top of the rotating connecting plate.

[0022] As a preferred embodiment of the present invention, a bearing connecting seat is rotatably mounted at the bottom end of the central threaded rod, and the bearing connecting seat is slidably connected to the guide slide column through a linear bearing.

[0023] The beneficial effects of this invention are as follows:

[0024] 1. The welding device for this valve assembly automatically calculates the welding torch movement path using infrared ranging data to avoid collisions with the workpiece and facilitates quick positioning of the relative position of the welding point between the valve body and the flange and the welding torch; it achieves dynamic compensation of the welding torch position by real-time feedback of the distance data between the welding components and the workpiece, combined with the closed-loop control algorithm of the main control box; and it optimizes heat input through intermittent welding to reduce deformation and ensure welding quality.

[0025] 2. The welding device for this valve assembly uses a laser rangefinder to achieve vertical scanning measurement via a lifting threaded rod, ensuring the absolute accuracy of the welding path, reducing the adverse effects of manual parameter input, and guaranteeing the welding effect.

[0026] 3. The welding device for this valve assembly drives six sets of limit sliders to move synchronously through a rotating mounting table and bevel gear set, achieving rapid centering and clamping of the flange; in conjunction with the stable clamping unit, it enables the valve body to be welded to be quickly positioned and fixed, reducing the difficulty of structural clamping.

[0027] 4. The welding device for this valve assembly uses a welding component driven by a servo motor to move the base horizontally, which, in conjunction with the closed-loop displacement control of the lifting cylinder, enables the welding torch to move with high precision in both horizontal and vertical directions. The rotating connecting plate is driven by a servo motor and achieves high-precision angle resolution through bevel gear transmission, meeting the requirements for complex circumferential seam welding. Attached Figure Description

[0028] Figure 1 This is a three-dimensional structural diagram of the overall assembly of the present invention;

[0029] Figure 2 This is a partial cross-sectional view of the overall assembly of the present invention.

[0030] Figure 3 For the present invention Figure 2 A magnified schematic diagram of the partial structure at point A in the middle;

[0031] Figure 4 For the present invention Figure 2 A magnified schematic diagram of the local structure at point B;

[0032] Figure 5 For the present invention Figure 2 A magnified schematic diagram of the structure at point C in the middle;

[0033] Figure 6 For the present invention Figure 2 A magnified schematic diagram of the local structure at point D;

[0034] Figure 7 For the present invention Figure 2 A magnified schematic diagram of the local structure at point E;

[0035] Figure 8 For the present invention Figure 2 A magnified schematic diagram of the structure at point F in the middle.

[0036] In the diagram: 1. Bearing base; 2. Limiting end plate; 3. Guide slide rod; 4. Transmission threaded rod; 5. Transverse base; 6. Positioning seat; 7. Welding control box; 8. Lifting cylinder; 9. Bearing support seat; 10. Automatic wire feeding welding torch; 11. Infrared rangefinder; 12. Infrared reflector; 13. Motor base one; 14. Servo motor one; 15. Reducer; 16. Fixed base plate; 17. Bearing seat; 18. Mounting top cover; 19. Protective opening cylinder; 20. Lifting connecting seat; 21. Laser rangefinder; 22. Lifting threaded rod; 23. Mounting base; 24. Connecting seat plate; 25. Limiting ring seat; 26. Rotating connecting plate; 27. Flange to be welded; 28. Valve body to be welded; 29. ​​Motor base two; 30. Servo motor two 31. Main control box; 32. Mounting slot; 33. Limiting slider; 34. Limiting threaded rod; 35. Servo motor three; 36. Driven bevel gear ring; 37. Driven bevel gear; 38. Rotating support column; 39. Rotating mounting platform; 40. Connecting bevel gear; 41. Driven bevel gear; 42. Bearing connecting seat; 43. Center threaded rod; 44. Guide slide column; 45. Slide column fixing seat; 46. Internal threaded cylinder one; 47. Fixing ring frame; 48. Guide cross arm one; 49. Limiting cross arm; 50. Rotating positioning seat; 51. Connecting pin; 52. Clamping crank arm; 53. Matching slide groove; 54. Internal threaded cylinder two; 55. Guide cross arm two; 56. Clamping positioning seat; 57. Clamping pin; 58. Limiting baffle; 59. Locking bolt. Detailed Implementation

[0037] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0038] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0039] A welding device for easy positioning of valve assemblies, such as... Figures 1 to 8 As shown, the assembly includes: a welding component mounted on the top of the support base 1, a ranging and positioning component, a valve clamping component, and a main control box 31 for controlling the overall device; the top of the valve clamping component clamps a flange 27 to be welded and a valve body 28 to be welded, with the valve body 28 positioned above the flange 27, and the two coaxial; the main body of the welding component is an automatic wire-feeding welding gun 10, with the welding head of the automatic wire-feeding welding gun 10 positioned below, tilted in the vertical plane at an angle of 45 degrees, i.e., the overall device is... Figure 1In the state shown (initial state), the distance between the welding head of the automatic wire feeding welding gun 10 and the bearing base 1 is fixed; the distance measuring and positioning component measures the thickness of the flange 27 to be welded and the distance from the port of the valve body 28 to be welded to the welding component, and feeds back the measurement data to the main control box 31. The main control box 31 controls the specific actions of the welding component and the valve clamping component according to the feedback data.

[0040] The structure designed in this application is mainly for welding conventional valve assemblies. Special valves, such as thin-walled valve bodies, flange-shaped valves, and valves with special body shapes, are not within the scope of the structure designed in this application.

[0041] Example 1

[0042] The welding assembly also includes a transverse base 5 with a transmission thread rod 4 internally threaded, a positioning cylinder 6 fixedly installed at the top of the transverse base 5, a lifting cylinder 8 fixedly installed inside the positioning cylinder 6, a bearing support 9 fixedly installed at the top of the lifting cylinder 8, and an automatic wire feeding welding gun 10 fixedly installed at the top of the bearing support 9.

[0043] The lifting cylinder 8 is existing technology and will not be described in detail in this application; the lifting cylinder 8 has a built-in magnetostrictive displacement sensor, grating ruler or encoder to detect the piston position in real time, forming a closed-loop control system to accurately control the stopping position; or a servo motor can be directly used to drive the lifting cylinder 8, combined with a precision transmission device to achieve high-precision positioning.

[0044] Furthermore, the aforementioned stroke-controlled lifting cylinder 8 can be replaced with a stroke-controlled electric telescopic rod, which facilitates accurate control of the height of the automatic wire feeding welding torch 10.

[0045] A welding control box 7 is fixedly installed on one side of the top of the transverse base 5. The welding control box 7 is directly connected to the main control box 31 through a wire and is directly controlled by the main control box 31. The welding control box 7 includes an automatic wire feeder, a welding machine control box, an inert gas protection structure, etc. Its connection method and control method are existing mature technologies, and will not be described in detail in this application.

[0046] Both ends of the transmission threaded rod 4 are rotatably mounted with limit end plates 2. The limit end plates 2 are fixedly mounted on the top of the bearing base 1, and both ends between the two limit end plates 2 are fixedly mounted with guide slide rods 3. The guide slide rods 3 pass through the transverse base 5 and are slidably connected to the transverse base 5 through linear bearings. During the transmission of the transmission threaded rod 4 to the transverse base 5, the guide slide rods 3 keep the transverse base 5 stable.

[0047] A motor base 13 is provided at the end of the transmission threaded rod 4 away from the valve clamping assembly. A servo motor 14 is fixedly installed at the top of the motor base 13. A reducer 15 is installed on the output shaft of the servo motor 14. The reducer 15 is connected to the transmission threaded rod 4. An infrared rangefinder 11 is fixedly installed at one end of the top of the transverse base 5. An infrared reflector 12 is installed at the top of the limiting end plate 2 near the valve clamping assembly.

[0048] Servo motor 14 is directly controlled by the main control box 31, which facilitates adjustment of the output speed of servo motor 14 according to actual conditions; such as Figure 1 As shown, the distance between the infrared rangefinder 11 and the infrared reflector 12 is the same as the distance from the transverse base 5 to the corresponding limiting end plate 2 (the limiting end plate 2 near the valve clamping assembly); the length of the automatic wire feeding welding gun 10 extending out of the transverse base 5 is fixed.

[0049] The main control box 31 has a built-in industrial computer for inputting the dimensional parameters of the flange 27 and valve body 28 to be welded, as well as the control parameters of the welding control box 7 (such as the wire feeding speed of the automatic wire feeder and the voltage and current of the welding machine control box). The distance from the end face of the transverse base 5 near the valve clamping assembly to the axis of the flange 27 to be welded is fixed. The main control box 31 controls the displacement magnitude and displacement speed of the transverse base 5 in real time according to the above parameters and the displacement parameters of the transverse base 5 fed back by the infrared rangefinder 11 and the infrared reflector 12, ensuring that the automatic wire feeding welding torch 10 can move to the designated position and effectively avoid collisions between the automatic wire feeding welding torch 10 and the flange 27, valve body 28, or valve clamping assembly to be welded.

[0050] The main body of the valve clamping assembly is a rotating connecting plate 26. A limiting ring seat 25 is rotatably installed at the bottom end of the rotating connecting plate 26. A connecting seat plate 24 is fixedly installed at the bottom end of the limiting ring seat 25. An mounting base 23 is fixedly installed at the bottom end of the connecting seat plate 24. The mounting base 23 is fixedly installed on the top end of the bearing base 1.

[0051] The bottom of the rotating connecting plate 26 is provided with a positioning slot. Inside the positioning slot, a positioning column is rotatably installed via a bearing. The positioning column is welded to the upper surface of the connecting base plate 24. The lower outer wall of the rotating connecting plate 26 is connected to the limiting ring seat 25 via a bearing. The double bearings fully ensure the stability of the rotating connecting plate 26 during rotation.

[0052] A rigid rubber is provided between the connecting plate 24 and the mounting base 23. The rigid rubber can reduce the conduction of welding temperature and the transmission of vibration, ensuring the stability of the device, reducing the influence of external factors on the welding effect of the flange 27 to be welded and the valve body 28 to be welded, and improving the welding quality.

[0053] A motor base 29 is fixedly installed on the top of the bearing base 1 between the main control box 31 and the mounting base 23. A servo motor 30 is fixedly installed on the top of the motor base 29. A drive bevel gear 37 is fixedly installed on the output shaft of the servo motor 30. A driven bevel gear ring 36 that meshes with the drive bevel gear 37 is fixedly installed in the middle of the outer wall of the rotating connecting plate 26.

[0054] Servo motor 20 is directly controlled by the main control box 31. Under the meshing transmission of the drive bevel gear 37 and the driven bevel gear ring 36, it stably controls the rotation speed of the rotating connecting plate 26. For example, when the flange 27 to be welded and the valve body 28 to be welded are being positioned for multi-point welding, the rotation speed of the rotating connecting plate 26 is increased. During continuous welding, the rotating connecting plate 26 is kept at a low and uniform rotation speed. The rotating connecting plate 26 is equipped with a grating ruler or encoder to monitor the angle in real time, and the error is corrected by the main control box 31.

[0055] Multiple mounting slots 32 are fixedly installed at equal angles on the top of the rotating connecting plate 26. Fixing plates are welded to the lower parts of both sides of the mounting slots 32. The fixing plates are directly installed on the top of the rotating connecting plate 26 by bolts. A limit slider 33 is slidably installed inside the mounting slot 32, and a limit threaded rod 34 is rotatably installed inside the mounting slot 32. The limit threaded rod 34 passes through the limit slider 33 and is threadedly connected to the limit slider 33.

[0056] The top of the limiting slider 33 is integrally formed with a semi-cylindrical boss for clamping the flange 27 to be welded; both ends of the limiting threaded rod 34 pass through the mounting groove 32 and extend outward. The end away from the vertical axis of the rotating connecting plate 26 is fixedly installed with a control handle, and the end close to the vertical axis of the rotating connecting plate 26 is fixedly installed with a driven bevel gear 41.

[0057] A rotating support column 38 is rotatably mounted on the top of the rotating connecting plate 26. A rotating mounting platform 39 is fixedly connected to the top of the rotating support column 38. A connecting bevel gear 40 that meshes with the driven bevel gear 41 is fixedly mounted on the outer wall of the rotating mounting platform 39.

[0058] like Figure 2 As shown, there are six mounting slots 32. Under the combined action of the connecting bevel gear 40 and the driven bevel gear 41, the six limit sliders 33 can move synchronously to clamp the flange 27 to be welded. The specific number of mounting slots 32 can be selected according to actual needs.

[0059] The valve body 28 to be welded has a stabilizing clamping unit inside. The main body of the stabilizing clamping unit is a central threaded rod 43. A bearing connecting seat 42 is rotatably mounted on the bottom end of the central threaded rod 43. Multiple connecting arms are welded equidistantly to the outer wall of the bearing connecting seat 42. Guide slides 44 are slidably mounted on the ends of the connecting arms through linear bearings. A slide block fixing seat 45 is fixedly mounted on the bottom end of the guide slide block 44. The slide block fixing seat 45 is fixedly mounted on the top of the rotating connecting plate 26. Figure 2 As shown, the guide slide pillars 44 are set in three pieces, made of high-strength stainless steel, with a diameter of about one centimeter.

[0060] The outer wall of the central threaded rod 43 is threaded with an internal threaded cylinder 46. The outer wall of the internal threaded cylinder 46 is fixedly connected with a fixing ring frame 47. The outer wall of the fixing ring frame 47 is integrally formed with multiple guide cross arms 48 and multiple rotating positioning seats 50 at equal intervals. The rotating positioning seat 50 is rotatably mounted with a clamping crank arm 52. The bottom end of the clamping crank arm 52 is set as a spherical head. The outer wall of the spherical head is covered with a rubber layer with a thickness of about one millimeter to avoid damage to the inner wall of the valve body 28 to be welded.

[0061] The clamping crank arm 52 is bent at the middle with a bending angle of approximately 120 degrees. A connecting pin 51 is rotatably mounted at the bend, and the connecting pin 51 is fixedly installed inside the rotating positioning seat 50. A matching groove 53 is provided on the upper part of the clamping crank arm 52. Figure 2 As shown, there are three guide arms 48 and three rotating positioning seats 50, and they are spaced apart.

[0062] The end of the guide arm 48 is slidably sleeved on the outer wall of the guide slide column 44 through a linear bearing, and the top end of the guide arm 48 is fixedly connected to the limiting arm 49. The limiting arm 49 presses on the top end of the valve body 28 to be welded, in order to maintain the stability of the valve body 28 to be welded.

[0063] The top thread of the outer wall of the central threaded rod 43 is threaded with an internal threaded cylinder 54. The outer wall of the internal threaded cylinder 54 is rotatably mounted with a connecting cylinder. The outer wall of the connecting cylinder is integrally formed with multiple guide cross arms 55 and multiple clamping and positioning seats 56 at equal intervals. There are three guide cross arms 55 and three clamping and positioning seats 56. The ends of the guide cross arms 55 are slidably sleeved on the outer wall of the guide slide column 44 through linear bearings.

[0064] A limit baffle 58 is welded to one side of the top of the connecting drum. A locking bolt 59 is threaded on one side of the limit baffle 58. When the locking bolt 59 is rotated clockwise, it presses against the internal threaded cylinder 54, thus fixing the internal threaded cylinder 54 relative to the connecting drum.

[0065] A clamping pin 57 is fixedly installed inside the clamping positioning seat 56. The clamping pin 57 is slidably installed inside the mating groove 53 of the clamping crank arm 52. The internal threaded cylinder 54 rotates clockwise and moves upward along the central threaded rod 43, thereby causing the top of the clamping crank arm 52 to deflect towards the central threaded rod 43, so that the spherical head approaches the inner wall of the valve body 28 to be welded and presses against the inner wall of the valve body 28 to be welded, thereby fixing the valve body 28 to be welded.

[0066] When using this embodiment:

[0067] First, place the flange 27 to be welded on the top of multiple mounting slots 32, so that the vertical axis of the flange 27 to be welded is nearly coincident with the vertical axis of the rotating connecting plate 26; then rotate the control handle of the limiting threaded rod 34 clockwise or drive the rotating mounting table 39 clockwise. Under the meshing of the connecting bevel gear 40 and the driven bevel gear 41, the multiple limiting threaded rods 34 rotate synchronously, causing the limiting slider 33 to move towards the vertical axis of the rotating connecting plate 26, and then clamp the flange 27 to be welded, so that the vertical axis of the flange 27 to be welded coincides with the vertical axis of the rotating connecting plate 26.

[0068] Then, place the valve body 28 to be welded on top of the flange 27 to be welded, so that the vertical axis of the flange 27 to be welded is nearly coincident with the vertical axis of the valve body 28 to be welded; then, insert the assembled stabilizing clamping unit into the valve body 28 to be welded (Note: the slide column fixing seat 45 is pre-fixed on the rotating connecting plate 26), so that the guide slide column 44 is inserted into the slide column fixing seat 45; then tighten the locking bolt 59, and rotate the central threaded rod 43 clockwise, so that the internal threaded cylinder 1 46 and internal threaded cylinder 2 54 descend synchronously until the limit cross arm 49 presses on the top of the valve body 28 to be welded; then loosen the locking bolt. Bolt 59, hold the central threaded rod 43 (the central threaded rod 43 is fixed and does not rotate), rotate the internal threaded cylinder 54 clockwise, the internal threaded cylinder 54 moves upward along the central threaded rod 43, and then drives the top of the clamping crank arm 52 to deflect towards the central threaded rod 43, so that the ball head approaches the inner wall of the valve body 28 to be welded and squeezes the inner wall of the valve body 28 to be welded, thereby fixing the valve body 28 to be welded, so that the vertical axis of the flange 27 to be welded coincides with the vertical axis of the valve body 28 to be welded; and input various welding parameters (as described above) into the industrial computer of the main control box 31.

[0069] Next, the main control box 31 controls servo motor 14, lifting cylinder 8, and servo motor 30. The spatial position of the welding point between the flange 27 to be welded and the valve body 28 to be welded remains unchanged (absolute position, relative to the bearing base 1). The welding position between the flange 27 to be welded and the valve body 28 to be welded changes with the rotation of the rotating connecting plate 26 (relative position, relative to the flange 27 to be welded and the valve body 28 to be welded). In the vertical plane where the vertical axis of the rotating connecting plate 26 and the horizontal axis of the transmission thread rod 4 coexist, a plane rectangular coordinate system is constructed. The absolute position of the welding point between the flange 27 to be welded and the valve body 28 to be welded is taken as the origin (0,0). The welding nozzle of the automatic wire feeding welding gun 10 is moved to the position (1,1) by servo motor 14 and lifting cylinder 8. Servo motor 14 and lifting cylinder 8 wait silently for the control of the main control box 31.

[0070] Finally, the main control box 31 controls the servo motor 30, which in turn controls the rotating connecting plate 26 to rotate one revolution. During this process, there are five pauses (if the outer diameter of the port of the valve body 28 to be welded is large, the number of pauses can be increased as needed). Each pause lasts for two to three seconds. During the pauses, the automatic wire feeding welding gun 10 is controlled to perform electric welding. After the electric welding is completed, circumferential welding is performed starting from the first welding point. The first circumferential welding is between the first and second welding points, the second circumferential welding is between the third and fourth welding points, the third circumferential welding is between the fifth welding point and the first welding point, the fourth circumferential welding is between the second and third welding points, and the fifth circumferential welding is between the fourth and fifth welding points. Welding is done at intervals to avoid heat accumulation and structural expansion and deformation. During this process, the rotating connecting plate 26 rotates at a low and uniform speed.

[0071] Example 2

[0072] The main body of the ranging and positioning component is a bearing base 17. A fixed base plate 16 is fixedly connected to the bottom end of the bearing base 17. The fixed base plate 16 is fixedly installed on the top end of the bearing base 1. An installation top cover 18 is fixedly installed on the top end of the bearing base 17. A protective opening cylinder 19 is fixedly connected to the top end of the installation top cover 18. A sliding groove is provided on the outer wall of the protective opening cylinder 19. The sliding groove is symmetrical about the plane in which the vertical axis of the protective opening cylinder 19 and the vertical axis of the rotating connecting plate 26 coexist.

[0073] A servo motor 35 is fixedly installed inside the bearing cylinder 17. The output shaft of the servo motor 35 passes through the top cover 18, and a lifting threaded rod 22 is fixedly installed at the top of the output shaft of the servo motor 35 via a coupling. A limit frame (not shown) is rotatably installed on the upper part of the lifting threaded rod 22. The limit frame is fixed to the protective opening cylinder 19, and a lifting connecting seat 20 is threaded on the outer wall of the lifting threaded rod 22. The lifting connecting seat 20 is slidably installed inside the protective opening cylinder 19. One end of the lifting connecting seat 20, which is close to the rotating connecting plate 26, is located inside the slide groove. The end face of this end is a vertical plane and is perpendicular to the plane of symmetry. A laser rangefinder 21 is fixedly installed on this end face. The laser rangefinder 21 is prior art and will not be described in detail in this application. The servo motor 35 is directly controlled by the main control box 31.

[0074] The laser emission direction of the laser rangefinder 21 coincides with and is perpendicular to the vertical axis of the rotating connecting plate 26. The distance from the laser emission point of the laser rangefinder 21 to the vertical axis of the rotating connecting plate 26 is the same as the distance from the automatic wire feeding welding gun 10 (welding nozzle) to the vertical axis of the rotating connecting plate 26. The laser rangefinder 21 moves up and down along the lifting threaded rod 22 to measure the parameters required for welding the flange 27 and valve body 28 to be welded, and feeds the parameters back to the main control box 31. There is no need to input parameters into the industrial computer before welding, which reduces the difficulty of operation.

[0075] Based on Example 1, this example is used as follows:

[0076] After fixing the flange 27 and valve body 28 to be welded, the main control box 31 determines the welding parameters of the automatic wire-feeding welding gun 10, then starts the servo motor 35, driving the lifting threaded rod 22 to rotate clockwise. This causes the lifting connecting seat 20 to move the laser rangefinder 21 upwards at a uniform speed, measuring some parameters of the flange 27 and valve body 28 to be welded, until the lifting connecting seat 20 contacts the limit frame. Then, the servo motor 35 rotates counterclockwise, and the lifting connecting seat 20 returns to its initial state (e.g., ...). Figure 1 (as shown), and then weld the flange 27 to be welded and the valve body 28 to be welded according to the welding method described in Embodiment 1.

[0077] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A welding device for valve assemblies that facilitates positioning, characterized in that, include: Welding assembly, ranging and positioning assembly, valve clamping assembly and main control box (31) for controlling the overall device are installed on the top of the support base (1). The welding assembly includes a transverse base (5) with a transmission thread rod (4) installed on its internal threads, a lifting cylinder (8) is fixedly installed at the top of the transverse base (5), a bearing support seat (9) is fixedly installed at the top of the lifting cylinder (8), and an automatic wire feeding welding gun (10) is fixedly installed at the top of the bearing support seat (9). The main body of the ranging and positioning component is a bearing base (17). A servo motor (35) is fixedly installed inside the bearing base (17), and a lifting threaded rod (22) is fixedly installed at the top of the output shaft of the servo motor (35). A lifting connecting seat (20) is threaded on the outer wall of the lifting threaded rod (22), and a laser rangefinder (21) is fixedly installed on one side of the lifting connecting seat (20). The main body of the valve clamping assembly is a rotating connecting plate (26). Multiple mounting slots (32) are fixedly installed at equal intervals on the top of the rotating connecting plate (26). A flange (27) to be welded is provided on the top of the multiple mounting slots (32). A valve body (28) to be welded is provided on the top of the flange (27). A stable clamping unit is provided inside the valve body (28). The main body of the stable clamping unit is a central threaded rod (43). The outer wall of the central threaded rod (43) is threaded with an internal threaded cylinder (46). The outer wall of the internal threaded cylinder (46) is fixedly connected with a fixing ring frame (47). The outer wall of the fixing ring frame (47) is integrally formed with multiple guide cross arms (48) and multiple rotating positioning seats (50) at equal intervals. The rotating positioning seat (50) is rotatably installed with a clamping crank arm (52). The bottom end of the clamping crank arm (52) is set with a spherical head. The top of the outer wall of the central threaded rod (43) is threaded with an internal threaded cylinder (54). The outer wall of the internal threaded cylinder (54) is rotatably installed with a connecting cylinder. The outer wall of the connecting cylinder is integrally formed with multiple guide cross arms (55) and multiple clamping positioning seats (56) at equal intervals. The clamping positioning seat (56) is fixedly installed with a clamping pin (57). The clamping pin (57) is slidably installed on the upper part of the clamping crank arm (52). The laser emission direction of the laser rangefinder (21) coincides with and is perpendicular to the vertical axis of the rotating connecting disk (26), and the distance from the laser emission point of the laser rangefinder (21) to the vertical axis of the rotating connecting disk (26) is the same as the distance from the automatic wire feeding welding gun (10) to the vertical axis of the rotating connecting disk (26).

2. The welding device for valve assembly with easy positioning according to claim 1, characterized in that: Both ends of the transmission threaded rod (4) are rotatably mounted with limit end plates (2), and both ends between the two limit end plates (2) are fixedly mounted with guide slide rods (3). The guide slide rods (3) pass through the transverse base (5) and are slidably connected with the transverse base (5).

3. The welding device for valve assembly with easy positioning according to claim 2, characterized in that: One end of the transmission threaded rod (4) is provided with a servo motor (14), and the output shaft of the servo motor (14) is equipped with a reducer (15). The reducer (15) is connected to the transmission threaded rod (4). One end of the top of the transverse base (5) is fixedly equipped with an infrared rangefinder (11), and one of the limiting end plates (2) is equipped with an infrared reflector (12) at its top.

4. The welding device for valve assembly with easy positioning according to claim 1, characterized in that: The bottom end of the bearing base (17) is fixedly connected to a fixed base plate (16), and the top end of the bearing base (17) is fixedly installed with an installation top cover (18). The top end of the installation top cover (18) is fixedly connected to a protective opening cylinder (19), and the lifting connecting seat (20) is slidably installed inside the protective opening cylinder (19).

5. The welding device for valve assembly with easy positioning according to claim 1, characterized in that: The bottom end of the rotating connecting plate (26) is rotatably mounted with a limiting ring seat (25), the bottom end of the limiting ring seat (25) is fixedly mounted with a connecting seat plate (24), and the bottom end of the connecting seat plate (24) is fixedly mounted with an installation base (23).

6. The welding device for valve assembly with easy positioning according to claim 1, characterized in that: The mounting groove (32) is slidably installed with a limiting slider (33), and the mounting groove (32) is rotatably installed with a limiting threaded rod (34), and a driven bevel gear (41) is fixedly installed at one end of the limiting threaded rod (34).

7. The welding device for valve assembly with easy positioning according to claim 1, characterized in that: A rotating support column (38) is rotatably mounted on the top of the rotating connecting plate (26), and a rotating mounting platform (39) is fixedly connected to the top of the rotating support column (38). A connecting bevel gear (40) that meshes with the driven bevel gear (41) is fixedly mounted on the outer wall of the rotating mounting platform (39).

8. The welding device for valve assembly with easy positioning according to claim 5, characterized in that: A servo motor (30) is provided between the main control box (31) and the mounting base (23). A drive bevel gear (37) is fixedly installed on the output shaft of the servo motor (30). A driven bevel gear ring (36) meshing with the drive bevel gear (37) is fixedly installed in the middle of the outer wall of the rotating connecting plate (26).

9. The welding device for valve assembly with easy positioning according to claim 1, characterized in that: The ends of the first guide arm (48) and the second guide arm (55) are slidably mounted with guide columns (44) via linear bearings. The bottom end of the guide column (44) is fixedly mounted with a column fixing seat (45), and the column fixing seat (45) is fixedly mounted on the top of the rotating connecting plate (26).

10. A welding device for valve assembly with easy positioning according to claim 1, characterized in that: The bottom end of the central threaded rod (43) is rotatably mounted with a bearing connecting seat (42), which is slidably connected to the guide slide (44) via a linear bearing.

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