Pipe fitting positioning and welding device with surrounding structure and welding method of pipe fitting positioning and welding device

Abstract

The invention discloses a pipe fitting positioning and welding device with a surrounding structure, and relates to the technical field of welding, the pipe fitting positioning and welding device comprises a supporting seat, side supporting frames are fixedly mounted at the two ends of the top of the supporting seat, and active clamping mechanisms are mounted in the side supporting frames to position and fix pipe fittings; a supporting seat is installed on the top face of the side supporting frame, a surrounding welding mechanism is installed in the middle of the top face of the supporting seat and used for conducting surrounding type welding on pipe fittings, telescopic plates are installed on the front side and the rear side of the side supporting frame, and the inner ends of the telescopic plates are connected with edge grinding mechanisms. The problems of shaking deviation, low adaptability, untight butt joint, insufficient welding strength and the like which are prone to occurring in the pipe fitting welding process are cooperatively solved, the pipe fitting positioning stability and the structural adaptability are improved, the welding quality is comprehensively guaranteed through the links of pretreatment, precise welding, auxiliary cleaning and the like, energy consumption is reduced, and the operation efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of welding technology, specifically to a pipe fitting positioning and welding device with a circumferential structure and its welding method. Background Technology

[0002] Pipe fitting positioning and welding equipment is a specialized device used to accurately position, securely clamp, and assist in welding operations of pipes and fittings during the welding process. It is widely used in petrochemical, municipal pipeline, nuclear power, and shipbuilding industries.

[0003] However, existing pipe welding equipment still has certain defects in use; An automatic rotation pipe welding device, as proposed in application number CN202421196111.X, includes a processing table. A fixed seat, an end support seat, a pipe support seat, and a vertical plate are sequentially spaced on the processing table. The fixed seat has a rotating hole aligned with the end support seat. A rotating rod is rotatably mounted within the rotating hole. A driving component is connected to the end of the rotating rod away from the end support seat to drive the rotating rod's rotation. A clamping rod facing the pipe support seat is rotatably mounted on the vertical plate. A welding module is mounted on the side of the processing table. By driving the rotating rod to rotate, different positions of the weld seam can be brought into contact with the welding module during the welding process. This allows the welding module to remain stationary while the weld seam rotates to achieve complete welding, improving welding efficiency. Furthermore, the end support seat and pipe support seat ensure uniform force distribution during pipe and end plug rotation, preventing deformation. However, in practical use, the following problems still exist: This pipe welding device achieves circumferential welding of pipes by rotating the pipes and positioning the welding structure. However, the pipes are rotated after being joined, which can easily cause wobbling during the rotation process, resulting in small deviations at the weld and affecting the subsequent welding effect. Furthermore, the positioning and support structure in this pipe welding device means that it can only weld pipes of specific specifications, making it difficult to adapt and adjust according to the size and specifications of the pipes, thus reducing the adaptability of the welding. When welding pipe fittings, burrs and gaps may be generated at the joint due to cutting. If the burrs and cuts are not treated, the joint may not be tight, and the gaps will affect the final weld strength and reduce the welding effect.

[0004] In view of this, in-depth research was conducted on the above issues, which led to the creation of this case.

[0005] To address the aforementioned issues, an innovative design was developed based on the existing pipe fitting positioning and welding device with a circumferential structure. Summary of the Invention

[0006] The purpose of this invention is to provide a pipe fitting positioning and welding device and its welding method with a surrounding structure, so as to solve the problems mentioned in the background art, such as the easy shaking caused by the rotation of pipe fittings after docking, resulting in weld deviation; the positioning support structure is only suitable for pipe fittings of specific specifications and has low adaptability; and the untreated burrs and gaps at the pipe fitting docking point can easily cause loose docking and insufficient welding strength, thereby affecting the welding effect.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a pipe fitting positioning and welding device with a surrounding structure, including a support base, side support frames fixedly installed at both ends of the top of the support base, and an active clamping mechanism installed inside the side support frames to position and fix the pipe fitting; A circumferential welding mechanism is installed in the middle of the top surface of the support base to perform circumferential welding on the pipe fitting. Telescopic plates are installed on the front and rear sides of the side support frame, and the inner end of the telescopic plates is connected to an edge grinding mechanism to grind the edge of the pipe before welding. The top of the side support frame is equipped with a piston cooling mechanism to cool the grinding area, and the piston cooling mechanism is linked with the edge grinding mechanism. The outer end of the piston cooling mechanism is connected to a driven vibration mechanism, which can vibrate the pipe to shake off debris.

[0008] Preferably, the active clamping mechanism includes a limiting post fixedly installed on the inner front end of the side support frame, a transmission screw rotatably installed on the inner rear end of the side support frame, the threads at both ends of the transmission screw being reversed, clamping seats symmetrically sleeved on the outer rings of the transmission screw and the limiting post, clamping rods symmetrically installed on the adjacent sides of the clamping seats, and a servo motor fixedly connected to the top end of the transmission screw, the servo motor being fixedly connected to the top of the side support frame.

[0009] Using the above technical solution, when the servo motor drives the transmission screw to rotate, because the threads at both ends of the transmission screw are reversed, the symmetrically fitted clamping seats will move relative to or away from each other along the limiting post and the transmission screw, thereby driving the clamping rod to move synchronously. This can adapt to pipes of different diameters and achieve stable clamping of the pipes, effectively preventing shaking caused by rotation after pipe docking, avoiding weld deviation, and improving positioning stability and structural adaptability.

[0010] Preferably, the circumferential welding mechanism includes a positioning ring fixedly installed in the middle of the top surface of the support base. A driven gear ring is rotatably installed on the inner ring of the positioning ring. A positioning seat is fixedly installed on the left side of the driven gear ring. An adjusting screw is rotatably installed inside the positioning seat. The threads at both ends of the adjusting screw are reversed. Knobs are fixedly installed at both ends of the adjusting screw.

[0011] Preferably, the surrounding welding mechanism further includes a movable seat symmetrically sleeved on the outer ring of the adjusting screw. A welding head is fixedly installed at the end of the movable seat away from the adjusting screw. A drive gear is meshed at the bottom right end of the driven gear one. A servo motor two is connected to the right end of the drive gear. The servo motor two is fixedly connected to the bottom of the support base.

[0012] Using the above technical solution, turning the knob can rotate the adjusting screw. Because the threads at both ends of the adjusting screw are reversed, the movable seat drives the welding head to move relative to or away from each other, adapting to pipe fittings of different diameters. Servo motor 2 drives the drive gear to rotate, meshing with driven gear ring 1 to rotate around the positioning ring, which in turn drives the positioning seat and welding head to rotate around the pipe, realizing circumferential welding, ensuring uniform and continuous weld, avoiding weld deviation, and improving welding quality.

[0013] Preferably, the edge grinding mechanism includes a fixing ring fixedly installed at the end of the telescopic plate away from the side support frame. A connecting seat is fixedly installed on the top outer ring of the fixing ring. A control cylinder is connected inside the connecting seat, and the control cylinder is fixedly connected to the side support frame.

[0014] Preferably, the edge grinding mechanism further includes a follower gear ring rotatably mounted on the inner ring of the fixed ring. A rotating plate is fixedly connected to the end of the follower gear ring away from the side support frame. The rotating plate has symmetrically opened inner limiting grooves inside. A fixing block is fixedly installed at the outer end of the inner limiting groove. A movable screw is threaded through the inner thread of the fixing block. A control plate is fixedly installed at the outer end of the movable screw. A connecting bearing is connected to the inner end of the movable screw. A grinding block is connected to the end of the connecting bearing away from the movable screw. The grinding block is slidably connected to the inner limiting groove. A drive gear is meshed with the top of the end of the follower gear ring near the side support frame. A drive motor is connected to the side of the drive gear near the side support frame. The drive motor is fixedly connected to the top of the side support frame.

[0015] Using the above technical solution, the control cylinder pushes the telescopic plate and the fixed ring to move through the connecting seat, thereby driving the grinding block to move and grind the edge of the pipe fitting; Rotating the control plate causes the movable screw to rotate, which in turn drives the grinding block to slide along the inner limit groove via the connecting bearing, adapting to different pipe diameters; The drive motor drives the active gear to mesh with the moving gear ring, causing the rotating plate and grinding block to rotate. This grinds the burrs and gaps on the edges of the pipe fittings, ensuring a tight fit and improving welding strength. It can also adapt to the grinding needs of pipe fittings of different specifications and grind the beveled ends of the pipe fittings, so that the pipe fittings form a "V" shaped groove after the fit is made, so as to adapt to different welding requirements.

[0016] Preferably, the piston cooling mechanism includes a piston box fixedly installed on the top surface of the side support frame. A reciprocating screw is rotatably installed inside the piston box. A first pulley is fixedly installed at the inner end of the reciprocating screw. A second pulley is fixedly sleeved on the shaft end of the drive motor. A transmission belt connects the second pulley and the first pulley. A piston plate is slidably sleeved on the outer ring of the reciprocating screw. The piston plate is slidably connected to the piston box.

[0017] Preferably, the piston cooling mechanism further includes a one-way valve one fixedly embedded in the top of the inner end of the piston box. The inlet end of the one-way valve one is fixedly installed with an inlet pipe. The front side of the inner end of the piston box is fixedly embedded with a one-way valve two. The outlet end of the one-way valve two is fixedly connected with an outlet bellows. The outlet bellows can be bent and positioned. The outlet end of the outlet bellows corresponds to the position of the grinding block.

[0018] Using the above technical solution, the drive motor drives the first pulley and the reciprocating screw to rotate through the second pulley and the transmission belt, causing the piston plate to slide back and forth in the piston box. When the piston plate moves outward, one check valve one opens, and coolant is drawn in through the inlet pipe. When the piston plate moves inward, one check valve two opens, and coolant is sprayed onto the grinding area through the outlet bellows, achieving timely cooling of the grinding area and preventing the high temperature of grinding from causing deformation of the pipes or affecting the grinding effect. At the same time, the drive motor linkage eliminates the need for additional power, saving energy.

[0019] Preferably, the driven vibration mechanism includes a cam disc fixedly mounted on the outer end of the reciprocating lead screw. A mounting base is fixedly mounted on the top outer side of the side support frame. A vibration rod slides through the interior of the mounting base. A telescopic rod is fixedly connected to the top of the vibration rod. A sleeve is threaded onto the top of the telescopic rod. The top of the sleeve fits against the cam disc. A baffle is fixedly mounted on the outer ring of the sleeve. A return spring is connected between the baffle and the mounting base. The vibration rod, telescopic rod, sleeve, and baffle are telescopically connected to the mounting base via the return spring.

[0020] Using the above technical solution, the reciprocating screw drives the cam disc to rotate, the cam disc pushes the sleeve rod to move downward, the return spring is compressed, and when the cam disc rotates to the point where the protrusion is far away from the sleeve rod, the return spring resets and drives the sleeve rod, telescopic rod and vibrating rod to move upward, so that the vibrating rod generates high-frequency reciprocating vibration and transmits it to the pipe fitting, shaking off the debris generated during grinding, avoiding debris residue from affecting the pipe fitting docking accuracy and welding quality. Moreover, the threaded fit of the telescopic rod and the sleeve rod can be adapted to pipe fittings of different diameters to meet different needs.

[0021] A welding method for a pipe fitting positioning welding device with a surrounding structure further includes: Step 1: Pass the two pipe sections to be welded through the side support frames at both ends, and clamp and position the pipe sections by controlling the active clamping mechanism. At this time, the inner ends of the pipe sections at both ends correspond to the grinding blocks in the edge grinding mechanism. Step 2: Adjust the position of the grinding block by rotating the movable screw so that the grinding block is in contact with the inner end of the pipe. Then control the rotation and movement of the edge grinding mechanism to grind the inner end of the pipe flat. When the vertical surface of the grinding block is in contact with the inner end of the pipe, straight grinding of the inner end can be performed. When the inclined surface of the grinding block is in contact with the inner end of the pipe, inclined grinding of the inner end can be performed. The drive motor is linked to the piston cooling mechanism, so that the piston plate slides back and forth in the piston box. Coolant is sprayed onto the grinding area through the liquid outlet bellows to avoid the high temperature of grinding affecting the pipe. Step 3: The reciprocating screw rotates, driving the cam disc to rotate. The cam disc pushes the sleeve rod downwards, compressing the return spring. When the cam disc protrudes away from the sleeve rod, the return spring returns to its original position, driving the sleeve rod, telescopic rod, and vibrating rod upwards. This causes the vibrating rod to generate high-frequency reciprocating vibration, which is transmitted to the pipe fitting, shaking off the grinding debris. Step 4: After grinding is completed, stop the movement of the edge grinding mechanism and adjust the grinding block to reset. Then release the active clamping mechanism from the pipe fitting and push the pipe fittings at both ends inward until the pipe fittings at both ends are joined and the joint seam corresponds to the welding head. At this time, control the active clamping mechanism to clamp the pipe fittings at both ends again. Step 5: Adjust the position of the upper and lower welding heads to align with the weld seam of the pipe fitting, and then start the rotating welding mechanism to achieve rotating and circling welding at the pipe fitting joint. During welding, the welding head first rotates upward 90 degrees to weld the upper half of the pipe fitting, and then resets after the upper half is welded. Next, it rotates downward 90 degrees to weld the lower half of the pipe fitting. Step 6: After welding is completed, release the active clamping mechanism from the pipe fitting to allow the welded pipe fitting to be unloaded.

[0022] Compared with existing technologies, the beneficial effects of this invention are as follows: This pipe fitting positioning and welding device with a circumferential structure, through the setting of five mechanisms—active clamping, circumferential welding, edge grinding, piston cooling, and driven vibration—synergistically solves problems such as wobbling deviation, low adaptability, loose connection, and insufficient welding strength that are prone to occur in pipe fitting welding. It not only improves the stability and structural adaptability of pipe fitting positioning but also comprehensively ensures welding quality, reduces energy consumption, and improves operational efficiency through pretreatment, precise welding, and auxiliary cleaning. The specific details are as follows: The active clamping mechanism uses a servo motor to drive a transmission screw with opposite threads at both ends, which drives the clamping seat and clamping rod to move relative to or away from each other. It can adapt to pipe fittings of different diameters and achieve stable clamping, effectively preventing weld deviation caused by rotation and shaking after pipe fittings are connected, improving positioning stability and structural adaptability, and ensuring accurate positioning of pipe fittings during welding. The circumferential welding mechanism adjusts the position of the welding head by adjusting the screw to adapt to different pipe diameters. With the help of two servo motors driving the driven gear ring to rotate around the positioning ring, the welding head can perform circumferential welding of the pipe fitting, ensuring uniform and continuous weld seam, avoiding local welding defects, and significantly improving welding quality. At the same time, the welding head can be welded in two parts, upper and lower, to further ensure comprehensive welding coverage. The edge grinding mechanism uses a control cylinder to move the grinding components and adjusts the position of the grinding block with a movable screw to adapt to different pipe diameters and fittings. The drive motor drives the grinding block to rotate, which can smooth out edge burrs and gaps, and can also process "V" grooves to ensure tight pipe fittings and improve welding strength. At the same time, it can adapt to the pretreatment requirements of different specifications of pipe fittings, laying the foundation for high-quality welding. The piston cooling mechanism is linked with the edge grinding mechanism. The drive motor drives the reciprocating screw to make the piston plate reciprocate. The coolant is drawn in and sprayed out through the one-way valve, which cools the grinding area in time, avoiding the deformation of the pipes or the impact on the grinding effect caused by high temperature. Moreover, no additional power source is required, saving energy and improving the practicality and economy of the device. The driven vibration mechanism is driven by a reciprocating screw to rotate a cam disc, which, together with a return spring, causes the vibrating rod to generate high-frequency reciprocating vibration, shaking off the debris generated during grinding. This prevents debris residue from affecting the pipe fitting connection accuracy and welding quality. Furthermore, the threaded engagement between the telescopic rod and the sleeve rod allows it to be adapted to pipe fittings of different diameters, enhancing the versatility of the device. Attached Figure Description

[0023] Figure 1 This is a side view of the external structure of the present invention; Figure 2 This is a schematic diagram showing the distribution structure of the active clamping mechanism and the surrounding welding mechanism of the present invention; Figure 3 This is a schematic diagram of the connection structure between the active clamping mechanism and the side support frame of the present invention; Figure 4 This is a schematic side view of the overall structure of the welding mechanism of the present invention; Figure 5 This is a side view of the surrounding welding mechanism of the present invention. Figure 6 This is a schematic diagram showing the distribution structure of the edge grinding mechanism and the piston cooling mechanism of the present invention; Figure 7 This is a side sectional view of the edge grinding mechanism of the present invention; Figure 8 This is a schematic diagram of the connection structure between the grinding block and the movable screw of the present invention; Figure 9 This is a schematic diagram of the linkage structure between the edge grinding mechanism and the piston cooling mechanism of the present invention; Figure 10 This is a side sectional view of the piston cooling mechanism of the present invention; Figure 11 This is a side cross-sectional schematic diagram of the driven vibration mechanism of the present invention.

[0024] In the diagram: 1. Support base; 2. Side support frame; 3. Limiting post; 4. Transmission screw; 5. Clamping seat; 6. Clamping rod; 7. Servo motor one; 8. Positioning ring; 9. Driven gear ring one; 10. Positioning seat; 11. Adjusting screw; 12. Knob; 13. Movable seat; 14. Welding head; 15. Drive gear; 16. Servo motor two; 17. Telescopic plate; 18. Fixed ring; 19. Connecting seat; 20. Control cylinder; 21. Follower gear ring; 22. Rotating plate; 23. Inner limiting groove; 24. Fixing block; 25. Movable screw; 26. Control panel; 27. Connecting bearing; 28. Grinding block; 29. ​​Drive gear; 30. Drive motor; 31. Piston box; 32. Reciprocating lead screw; 33. First pulley; 34. Transmission belt; 35. Second pulley; 36. Piston plate; 37. One-way valve I; 38. Inlet pipe; 39. One-way valve II; 40. Outlet bellows; 41. Cam plate; 42. Mounting base; 43. Vibration rod; 44. Telescopic rod; 45. Sleeve rod; 46. Baffle; 47. Return spring. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Please see Figures 1-11 The present invention provides a technical solution: a pipe fitting positioning and welding device with a surrounding structure, including a support base 1, side support frames 2 fixedly installed at both ends of the top of the support base 1, an active clamping mechanism installed inside the side support frame 2 to position and fix the pipe fitting, the active clamping mechanism including a limiting post 3 fixedly installed at the front end of the inner side of the side support frame 2, a transmission screw 4 rotatably installed at the rear end of the inner side of the side support frame 2, the threads at both ends of the transmission screw 4 are reversed, clamping seats 5 are symmetrically sleeved on the outer ring of the transmission screw 4 and the limiting post 3, clamping rods 6 are symmetrically installed on the adjacent sides of the clamping seats 5, a servo motor 7 is fixedly connected to the top of the transmission screw 4, and the servo motor 7 is fixedly connected to the top of the side support frame 2; In the above structure design, when the pipe needs to be positioned and fixed, the servo motor 7 is started. The output shaft of the servo motor 7 drives the transmission screw 4, which is fixedly connected to it, to rotate at the rear end inside the side support frame 2. Since the threads at both ends of the transmission screw 4 are reversed, and the outer ring of the transmission screw 4 and the limiting post 3 are symmetrically fitted with clamping seats 5, the limiting post 3 guides and limits the clamping seats 5 to prevent the clamping seats 5 from rotating with the transmission screw 4. When the transmission screw 4 rotates, the two symmetrically fitted clamping seats 5 will move relatively closer or further away from each other along the limiting post 3 and the transmission screw 4. The adjacent sides of the clamping seats 5 are symmetrically installed with clamping rods 6, which will move synchronously with the clamping seats 5. When the pipe fitting is placed between the two end support frames 2, the servo motor 7 is controlled to make the transmission screw 4 rotate in the forward direction. The two clamping seats 5 drive the clamping rods 6 to move closer to each other until the clamping rods 6 are in close contact with the outer wall of the pipe fitting, so as to achieve stable clamping of the pipe fitting and prevent the pipe fitting from shaking after rotation after docking. When it is necessary to release the pipe fitting, the servo motor 7 is controlled to make the transmission screw 4 rotate in the reverse direction. The two clamping seats 5 drive the clamping rods 6 to move away from each other, thereby releasing the clamping of the pipe fitting.

[0027] A circumferential welding mechanism is installed in the middle of the top surface of the support base 1 to perform circumferential welding on the pipe fitting. The circumferential welding mechanism includes a positioning ring 8 fixedly installed in the middle of the top surface of the support base 1. A driven gear ring 9 is rotatably installed on the inner ring of the positioning ring 8. A positioning seat 10 is fixedly installed on the left side of the driven gear ring 9. An adjusting screw 11 is rotatably installed inside the positioning seat 10. The threads at both ends of the adjusting screw 11 are reversed. A knob 12 is fixedly installed at both ends of the adjusting screw 11. The circumferential welding mechanism also includes a movable seat 13 symmetrically sleeved on the outer ring of the adjusting screw 11. A welding head 14 is fixedly installed at the end of the movable seat 13 away from the adjusting screw 11. A drive gear 15 is meshed with the bottom of the right end of the driven gear ring 9. A servo motor 16 is connected to the right end of the drive gear 15. The servo motor 16 is fixedly connected to the bottom of the support base 1. The above structure is designed so that when the position of the welding head 14 needs to be adjusted according to the pipe diameter, the knob 12 is turned to drive the adjusting screw 11 inside the positioning seat 10 to rotate. Since the threads at both ends of the adjusting screw 11 are reversed, the movable seat 13 symmetrically sleeved on its outer ring will move relatively closer or further away, thereby driving the welding head 14 at the end of the movable seat 13 to move synchronously until the distance between the welding head 14 and the outer wall of the pipe meets the welding requirements, thus adapting to pipes of different diameters. During welding, servo motor 16 is started, and its output shaft drives drive gear 15 to rotate. Since drive gear 15 meshes with the bottom right end of driven gear ring 9, and driven gear ring 9 is rotatably mounted on the inner ring of positioning ring 8, where positioning ring 8 is fixed in the middle of the top surface of support base 1, providing a positioning reference for the entire circumferential motion, drive gear 15 will drive driven gear ring 9 to make circumferential motion around positioning ring 8. Positioning seat 10 is fixed on the left side of driven gear ring 9, so positioning seat 10 will rotate synchronously with driven gear ring 9, thereby driving adjusting screw 11, movable seat 13 and welding head 14 to rotate around the pipe, so that welding head 14 can perform all-round circumferential welding on the pipe joint, ensuring uniform and continuous weld and improving welding quality.

[0028] Telescopic plates 17 are installed on the front and rear sides of the side support frame 2. An edge grinding mechanism is connected to the inner end of the telescopic plate 17 to grind the edge of the pipe fitting before welding. The edge grinding mechanism includes a fixing ring 18 fixedly installed on the end of the telescopic plate 17 away from the side support frame 2. A connecting seat 19 is fixedly installed on the top outer ring of the fixing ring 18. A control cylinder 20 is connected inside the connecting seat 19. The control cylinder 20 is fixedly connected to the side support frame 2. The edge grinding mechanism also includes a follower gear ring 21 rotatably installed on the inner ring of the fixing ring 18. A rotating plate 22 is fixedly connected to the end of the follower gear ring 21 away from the side support frame 2. The interior of the rotating plate 22 is symmetrical. An inner limiting groove 23 is provided, and a fixing block 24 is fixedly installed at the outer end of the inner limiting groove 23. A movable screw 25 is passed through the internal thread of the fixing block 24. A control plate 26 is fixedly installed at the outer end of the movable screw 25. A connecting bearing 27 is connected to the inner end of the movable screw 25. A grinding block 28 is connected to the end of the connecting bearing 27 away from the movable screw 25. The grinding block 28 is slidably connected to the inner limiting groove 23. A drive gear 29 is meshed with the top of the end of the follower gear ring 21 near the side support frame 2. A drive motor 30 is connected to the side of the drive gear 29 near the side support frame 2. The drive motor 30 is fixedly connected to the top of the side support frame 2. The above structure is designed so that when the position of the grinding block 28 needs to be adjusted to match the pipe diameter, the control plate 26 is rotated to drive the movable screw 25 to rotate in the thread of the fixed block 24. Since the inner end of the movable screw 25 is connected to the grinding block 28 through the connecting bearing 27, and the grinding block 28 is slidably connected to the inner limiting groove 23 of the rotating plate 22, the movable screw 25 will push or pull the grinding block 28 to slide radially along the inner limiting groove 23 until the distance between the grinding block 28 and the edge of the pipe meets the grinding requirements and can match pipes of different diameters. The control cylinder 20 extends and retracts, driving the fixed ring 18 and the telescopic plate 17 to move axially through the connecting seat 19, so that the follower toothed ring 21, the rotating plate 22 and the grinding block 28 of the inner ring of the fixed ring 18 move synchronously until the grinding block 28 fits against the inner end of the pipe to be ground. When the grinding block 28 fits against the vertical surface, straight surface grinding can be performed, and when it fits against the inclined surface, "V" groove inclined surface grinding can be performed. When grinding, the drive motor 30 is started, and its output shaft drives the drive gear 29 to rotate. Since the drive gear 29 meshes with the top of the side support frame 2 near the follower gear ring 21, and the follower gear ring 21 is rotated and installed on the inner ring of the fixed ring 18, the drive gear 29 will drive the follower gear ring 21 to rotate around the inner ring of the fixed ring 18, thereby driving the rotating plate 22 and the grinding block 28 at the end of the follower gear ring 21 to rotate synchronously. With the extension and retraction of the control cylinder 20, the edge of the pipe can be rotated and ground to smooth out burrs and gaps, laying the foundation for subsequent tight connection and welding.

[0029] A piston cooling mechanism is installed on the top of the side support frame 2 to cool the polished area. The piston cooling mechanism is linked with the edge polishing mechanism. The piston cooling mechanism includes a piston box 31 fixedly installed on the top surface of the side support frame 2. A reciprocating screw 32 is rotatably installed inside the piston box 31. A first pulley 33 is fixedly installed on the inner end of the reciprocating screw 32. A second pulley 35 is fixedly sleeved on the shaft end of the drive motor 30. A transmission belt 34 connects the second pulley 35 and the first pulley 33. The outer ring of 32 is slidably fitted with a piston plate 36, which is slidably connected to the piston box 31. The piston cooling mechanism also includes a one-way valve 37 fixedly embedded in the top of the inner end of the piston box 31. The inlet end of the one-way valve 37 is fixedly installed with an inlet pipe 38. The front side of the inner end of the piston box 31 is fixedly embedded with a one-way valve 39. The outlet end of the one-way valve 39 is fixedly connected with an outlet bellows 40. The outlet bellows 40 can be bent and positioned. The outlet end of the outlet bellows 40 corresponds to the position of the grinding block 28. In the above-described structure, when the drive motor 30 in the edge grinding mechanism is working, the second pulley 35, which is fixedly sleeved on its shaft end, rotates synchronously. Through the connected transmission belt 34, it drives the first pulley 33 at the inner end of the reciprocating screw 32 to rotate, thereby causing the reciprocating screw 32 inside the piston box 31 to rotate accordingly. Since the piston plate 36 is slidably sleeved on the outer ring of the reciprocating screw 32, and the piston plate 36 is slidably connected to the piston box 31, the rotation of the reciprocating screw 32 will drive the piston plate 36 to slide axially back and forth inside the piston box 31. When the piston plate 36 moves outward, the internal space of the piston box 31 increases and the pressure decreases. At this time, the one-way valve 37 fixedly embedded in the top of the inner end of the piston box 31 opens, and the external coolant is drawn into the piston box 31 for storage through the inlet pipe 38. When the piston plate 36 moves inward, the internal space of the piston box 31 shrinks and the pressure increases. The one-way valve 37 closes, while the one-way valve 39 on the front side of the inner end of the piston box 31 opens, and the coolant in the piston box 31 enters the outlet bellows 40 through the one-way valve 39. The outlet corrugated pipe 40 can be bent and positioned, and its outlet end corresponds to the position of the grinding block 28. Therefore, the coolant can be accurately sprayed onto the grinding part of the pipe, and the heat generated by grinding can be carried away in time, avoiding the deformation of the pipe or affecting the grinding effect due to high temperature. At the same time, with the linkage with the drive motor 30, an energy-saving and efficient cooling function is achieved.

[0030] The outer end of the piston cooling mechanism is connected to a driven vibration mechanism. The driven vibration mechanism can vibrate the pipe fittings to shake off the debris. The driven vibration mechanism includes a cam disk 41 fixedly installed on the outer end of the reciprocating screw 32. A mounting base 42 is fixedly installed on the top outer side of the side support frame 2. A vibration rod 43 slides through the inside of the mounting base 42. A telescopic rod 44 is fixedly connected to the top of the vibration rod 43. A sleeve rod 45 is threaded on the top of the telescopic rod 44. The top of the sleeve rod 45 is in contact with the cam disk 41. A baffle 46 is fixedly installed on the outer ring of the sleeve rod 45. A return spring 47 is connected between the baffle 46 and the mounting base 42. The vibration rod 43, the telescopic rod 44, the sleeve rod 45 and the baffle 46 are telescopically connected to the mounting base 42 through the return spring 47. In the above-described structure, when the reciprocating screw 32 in the piston cooling mechanism rotates, the cam disk 41 fixedly mounted at its outer end rotates synchronously, providing a power source for the driven vibration mechanism. When the protruding part of the cam disk 41 rotates to fit against the top of the sleeve rod 45, it will push the sleeve rod 45 to move downward. The sleeve rod 45 drives the telescopic rod 44 and the vibration rod 43 to move downward synchronously. At this time, the baffle 46 on the outer ring of the sleeve rod 45 compresses the return spring 47 between the mounting seat 42 and the baffle 46, storing elastic potential energy. When the cam disk 41 rotates to the point where the protruding part is far away from the sleeve rod 45, the return spring 47 releases the elastic potential energy, pushing the baffle 46, the sleeve rod 45, the telescopic rod 44 and the vibration rod 43 to return upward. As the cam disc 41 rotates continuously, the above process is repeated, causing the vibrating rod 43 to generate high-frequency reciprocating vibration. The vibration is transmitted to the pipe body through contact with the pipe, and the vibration inertia is used to dislodge the grinding debris from the pipe surface, thus achieving the dislodging of the debris. The telescopic rod 44 and the sleeve rod 45 are connected by a threaded connection. The total length of the two can be adjusted by rotating the sleeve rod 45 to ensure that the top of the sleeve rod 45 is always in close contact with the cam plate 41, thereby adapting to pipe fittings of different diameters and ensuring stable vibration transmission. The mounting base 42 guides and limits the vibration rod 43 to ensure its stable axial reciprocating motion and avoids deviation that affects the vibration effect.

[0031] A welding method for a pipe fitting positioning welding device with a surrounding structure further includes: Step 1: Pass the two pipe sections to be welded through the side support frames 2 at both ends, and clamp and position the pipe sections by controlling the active clamping mechanism. At this time, the inner ends of the pipe sections at both ends correspond to the grinding blocks 28 in the edge grinding mechanism. Step 2: Adjust the position of the grinding block 28 by rotating the movable screw 25 so that the grinding block 28 is in contact with the inner end of the pipe. Then control the rotation and movement of the edge grinding mechanism to grind the inner end of the pipe flat. When the vertical surface of the grinding block 28 is in contact with the inner end of the pipe, the straight surface of the inner end can be ground. When the inclined surface of the grinding block 28 is in contact with the inner end of the pipe, the inclined surface of the inner end can be ground. Drive the motor 30 to link the piston cooling mechanism, so that the piston plate 36 slides back and forth in the piston box 31. Coolant is sprayed onto the grinding area through the liquid outlet bellows 40 to avoid the high temperature of grinding affecting the pipe. Step 3: The reciprocating screw 32 rotates, driving the cam disc 41 to rotate. The cam disc 41 pushes the sleeve rod 45 downward, compressing the return spring 47. When the cam disc 41 protrudes away from the sleeve rod 45, the return spring 47 returns to its original position, driving the sleeve rod 45, the telescopic rod 44, and the vibrating rod 43 upward. This causes the vibrating rod 43 to generate high-frequency reciprocating vibration, which is transmitted to the pipe fitting, shaking off the grinding debris. Step 4: After grinding is completed, stop the movement of the edge grinding mechanism and adjust the grinding block 28 to reset. Then release the active clamping mechanism from the pipe fitting and push the pipe fittings at both ends to move inward until the pipe fittings at both ends are joined and the joint seam corresponds to the welding head 14. At this time, control the active clamping mechanism to clamp the pipe fittings at both ends again. Step 5: Adjust the position of the upper and lower welding heads 14 to align with the weld seam of the pipe fitting, and then start the circumferential welding mechanism to achieve circumferential welding at the joint of the pipe fitting. During welding, the welding head 14 first rotates upward 90 degrees to weld the upper half of the pipe fitting, and resets when the upper half is welded. Then it rotates downward 90 degrees to weld the lower half of the pipe fitting. Step 6: After welding is completed, release the active clamping mechanism from the pipe fitting to allow the welded pipe fitting to be unloaded.

[0032] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0033] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pipe fitting positioning and welding device with a surrounding structure, comprising a support base (1), characterized in that: The top two ends of the support base (1) are fixedly installed with side support frames (2), and the inside of the side support frames (2) is equipped with an active clamping mechanism to position and fix the pipe fittings. The support base (1) is equipped with a circumferential welding mechanism at the center of its top surface to perform circumferential welding on the pipe fittings; The side support frame (2) is equipped with telescopic plates (17) on both the front and rear sides. The inner end of the telescopic plate (17) is connected to an edge grinding mechanism to grind the edge of the pipe before welding. The top of the side support frame (2) is equipped with a piston cooling mechanism to cool the grinding area. The piston cooling mechanism is linked with the edge grinding mechanism. The outer end of the piston cooling mechanism is connected to a driven vibration mechanism, which can vibrate the pipe to shake off debris.

2. The pipe fitting positioning and welding device with a circumferential structure according to claim 1, characterized in that: The active clamping mechanism includes a limiting post (3) fixedly installed on the inner front end of the side support frame (2). A transmission screw (4) is rotatably installed on the inner rear end of the side support frame (2). The threads at both ends of the transmission screw (4) are reversed. A clamping seat (5) is symmetrically sleeved on the outer ring of the transmission screw (4) and the limiting post (3). A clamping rod (6) is symmetrically installed on the adjacent side of the clamping seat (5). A servo motor (7) is fixedly connected to the top of the transmission screw (4). The servo motor (7) is fixedly connected to the top of the side support frame (2).

3. The pipe fitting positioning and welding device with a circumferential structure according to claim 1, characterized in that: The circumferential welding mechanism includes a positioning ring (8) fixedly installed in the middle of the top surface of the support base (1). A driven toothed ring (9) is rotatably installed on the inner ring of the positioning ring (8). A positioning seat (10) is fixedly installed on the left side of the driven toothed ring (9). An adjusting screw (11) is rotatably installed inside the positioning seat (10). The threads at both ends of the adjusting screw (11) are reversed. A knob (12) is fixedly installed at both ends of the adjusting screw (11).

4. The pipe fitting positioning and welding device with a circumferential structure according to claim 3, characterized in that: The surrounding welding mechanism also includes a movable seat (13) symmetrically sleeved on the outer ring of the adjusting screw (11). A welding head (14) is fixedly installed at the end of the movable seat (13) away from the adjusting screw (11). A drive gear (15) is meshed at the bottom of the right end of the driven gear ring (9). A servo motor (16) is connected to the right end of the drive gear (15). The servo motor (16) is fixedly connected to the bottom of the support base (1).

5. The pipe fitting positioning and welding device with a circumferential structure according to claim 1, characterized in that: The edge grinding mechanism includes a fixing ring (18) fixedly installed at one end of the telescopic plate (17) away from the side support frame (2). A connecting seat (19) is fixedly installed on the top outer ring of the fixing ring (18). A control cylinder (20) is connected inside the connecting seat (19). The control cylinder (20) is fixedly connected to the side support frame (2).

6. A pipe fitting positioning and welding device with a circumferential structure according to claim 5, characterized in that: The edge grinding mechanism also includes a follower gear ring (21) rotatably mounted on the inner ring of the fixed ring (18). A rotating plate (22) is fixedly connected to one end of the follower gear ring (21) away from the side support frame (2). The rotating plate (22) has symmetrically arranged inner limiting grooves (23) inside. A fixing block (24) is fixedly mounted on the outer end of the inner limiting groove (23). A movable screw (25) is threaded through the inner end of the fixing block (24). A control plate (26) is fixedly mounted on the outer end of the movable screw (25). The inner end of the screw (25) is connected to a connecting bearing (27). The end of the connecting bearing (27) away from the movable screw (25) is connected to a grinding block (28). The grinding block (28) is slidably connected to the inner limiting groove (23). The top of the follower gear ring (21) near the side support frame (2) is meshed with a drive gear (29). The side of the drive gear (29) near the side support frame (2) is connected to a drive motor (30). The drive motor (30) is fixedly connected to the top of the side support frame (2).

7. A pipe fitting positioning and welding device with a circumferential structure according to claim 6, characterized in that: The piston cooling mechanism includes a piston box (31) fixedly installed on the top surface of the side support frame (2). A reciprocating screw (32) is rotatably installed inside the piston box (31). A first pulley (33) is fixedly installed at the inner end of the reciprocating screw (32). A second pulley (35) is fixedly sleeved on the shaft end of the drive motor (30). A transmission belt (34) is connected between the second pulley (35) and the first pulley (33). A piston plate (36) is slidably sleeved on the outer ring of the reciprocating screw (32). The piston plate (36) is slidably connected to the piston box (31).

8. A pipe fitting positioning and welding device with a circumferential structure according to claim 7, characterized in that: The piston cooling mechanism also includes a one-way valve (37) fixedly embedded in the top of the inner end of the piston box (31). The inlet end of the one-way valve (37) is fixedly installed with an inlet pipe (38). The front side of the inner end of the piston box (31) is fixedly embedded with a one-way valve (39). The outlet end of the one-way valve (39) is fixedly connected with an outlet bellows (40). The outlet bellows (40) can be bent and positioned. The outlet end of the outlet bellows (40) corresponds to the position of the grinding block (28).

9. A pipe fitting positioning and welding device with a circumferential structure according to claim 7, characterized in that: The driven vibration mechanism includes a cam disk (41) fixedly installed on the outer end of the reciprocating screw (32). A mounting base (42) is fixedly installed on the top outer side of the side support frame (2). A vibration rod (43) slides through the inside of the mounting base (42). A telescopic rod (44) is fixedly connected to the top of the vibration rod (43). A sleeve rod (45) is threaded on the top of the telescopic rod (44). The top of the sleeve rod (45) is in contact with the cam disk (41). A baffle (46) is fixedly installed on the outer ring of the sleeve rod (45). A return spring (47) is connected between the baffle (46) and the mounting base (42). The vibration rod (43), telescopic rod (44), sleeve rod (45) and baffle (46) are telescopically connected to the mounting base (42) through the return spring (47).

10. A welding method for a pipe fitting positioning and welding device with a circumferential structure according to any one of claims 1-9, characterized in that, Also includes: Step 1: Pass the two pipe sections to be welded through the side support frames (2) at both ends, and clamp and position the pipe sections by controlling the active clamping mechanism. At this time, the inner ends of the pipe sections at both ends correspond to the grinding blocks (28) in the edge grinding mechanism. Step 2: Adjust the position of the grinding block (28) by rotating the movable screw (25) so that the grinding block (28) is in contact with the inner end of the pipe. Then control the rotation and movement of the edge grinding mechanism to grind the inner end of the pipe flat. When the vertical surface of the grinding block (28) is in contact with the inner end of the pipe, the straight surface of the inner end can be ground. When the inclined surface of the grinding block (28) is in contact with the inner end of the pipe, the inclined surface of the inner end can be ground. Drive the motor (30) to link the piston cooling mechanism, so that the piston plate (36) slides back and forth in the piston box (31). Cooling liquid is sprayed onto the grinding area through the liquid outlet bellows (40) to avoid the high temperature of grinding affecting the pipe. Step 3: The reciprocating screw (32) rotates, driving the cam disc (41) to rotate. The cam disc (41) pushes the sleeve rod (45) downward, compressing the return spring (47). When the cam disc (41) protrudes away from the sleeve rod (45), the return spring (47) returns to its original position, driving the sleeve rod (45), telescopic rod (44), and vibrating rod (43) upward. This causes the vibrating rod (43) to generate high-frequency reciprocating vibration, which is transmitted to the pipe fitting, shaking off the debris generated during grinding. Step 4: After grinding is completed, stop the movement of the edge grinding mechanism and adjust the grinding block (28) to reset. Then release the active clamping mechanism from the pipe fitting and push the pipe fittings at both ends to move inward until the pipe fittings at both ends are joined together and the joint seam corresponds to the welding head (14). At this time, control the active clamping mechanism to clamp the pipe fittings at both ends again. Step 5: Adjust the position of the upper and lower welding heads (14) to connect with the weld seam of the pipe fitting, and then start the rotation of the circumferential welding mechanism to achieve circumferential welding of the pipe fitting connection. When welding, the welding head (14) first rotates 90 degrees upward to weld the upper half of the pipe fitting, and resets when the upper half is welded. Then it rotates 90 degrees downward to weld the lower half of the pipe fitting. Step 6: After welding is completed, release the active clamping mechanism from the pipe fitting to allow the welded pipe fitting to be unloaded.

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