Positioning and clamping structure for welding device

Abstract

The invention discloses a positioning and clamping structure for a welding device, a first rotating cylinder is rotatably mounted in a first mounting shaft seat through a bearing, a first clamping structure for positioning and clamping the center of a workpiece is mounted on the inner ring of the first rotating cylinder, and a second mounting shaft seat is fixed on the right side of the upper part of a base; a second rotating cylinder is rotationally mounted in the second mounting shaft seat through a bearing, a second clamping structure used for center positioning and clamping of a workpiece is mounted on the inner ring of the second rotating cylinder, a rotating structure used for rotating the first rotating cylinder and the second rotating cylinder is mounted above the base, and a supporting frame is fixed to the middle of the upper portion of the base; the supporting frame is located between the first rotating cylinder and the second rotating cylinder, a positioning structure used for positioning and aligning a workpiece is fixed to the upper portion of the supporting frame, through the symmetrical design of the first clamping structure and the second clamping structure, the three sets of clamping pieces distributed in an annular array are used for synchronously approaching and clamping the workpiece, and it is guaranteed that the workpiece is located at the central axis of the rotating cylinders all the time; and the coaxiality of the two tubular workpieces during butt joint is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of welding equipment, and more particularly to a positioning and clamping structure for a welding apparatus. Background Technology

[0002] Welding of tubular workpieces is widely used, and its quality directly affects the structural strength, sealing performance, and service life of the product. During the welding process, a positioning structure is needed to clamp and fix the tubular workpiece to ensure welding accuracy. Currently, positioning devices mostly use a single clamping point or a simple chuck structure. When splicing two tubular components, it is difficult to ensure the coaxiality of the two workpieces at the joint, easily leading to problems such as interface misalignment and edge displacement. This results in uneven stress at the weld, making breakage or leakage more likely during subsequent use. Furthermore, because the welding equipment is automated, it cannot be guaranteed that the connection point of the two tubular components is directly below the weld head after the joint is formed. This may cause a certain positional deviation during subsequent welding, thus affecting welding accuracy. Summary of the Invention

[0003] The present invention provides a positioning and clamping structure for a welding device, which solves the above-mentioned problems.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A positioning and clamping structure for a welding device includes a base. A mounting shaft seat is slidably mounted on the upper left side of the base via a guide post and a sliding block. A moving cylinder is mounted above the base, with its push rod fixed below the mounting shaft seat. A rotating cylinder is rotatably mounted inside the mounting shaft seat via a bearing. A clamping structure for center positioning and clamping of the workpiece is mounted on the inner ring of the rotating cylinder. A second mounting shaft seat is fixed on the upper right side of the base. A second rotating cylinder is rotatably mounted inside the second mounting shaft seat via a bearing. A clamping structure for center positioning and clamping of the workpiece is mounted on the inner ring of the second rotating cylinder. A rotating structure for rotating the first and second rotating cylinders is mounted above the base. Two workpieces are fixed inside the first and second rotating cylinders respectively via the clamping structures. Then, under the action of the moving cylinder, the clamping structure moves the entire mounting shaft seat and clamping structure, causing the two workpieces to abut against each other, thus facilitating the welding of two tubular workpieces together. A support frame is fixed at the middle of the upper part of the base. The support frame is located between the first rotating cylinder and the second rotating cylinder. A positioning structure for workpiece positioning and alignment is fixed above the support frame. The positioning structure is linked with the clamping structure through a driving component. A welding head for workpiece welding is fixed above the positioning structure.

[0005] Preferably, the clamping structure includes two fixed rings and two deflection frames. The two fixed rings are fixed to the left and right ends of the rotating cylinder. The fixed rings have three sets of deflection guide grooves arranged in annular arrays. The center of the deflection guide grooves is collinear with the center of the fixed ring. The inner ends of the two fixed rings are screwed with three guide frames arranged in annular arrays. The two deflection frames are located at the inner ends of the two guide frames. Three deflection rods arranged in annular arrays are fixed between the two deflection frames. The three deflection rods are slidably inserted into the three deflection guide grooves of the fixed rings. Three sets of clamping members arranged in annular arrays are slidably installed between the two deflection frames. The clamping members are slidably connected to the corresponding guide frames. The inner wall of the rotating cylinder is equipped with a clamping cylinder through a bracket. The push rod of the clamping cylinder is rotatably connected to the two deflection frames through a straight rod. When the push rod of the clamping cylinder extends, it can cause the two deflection frames to deflect upwards through the straight rod and rotate along the deflection guide grooves, thereby causing the three clamping members to move closer to each other synchronously. The clamping structure one and the clamping structure two have the same structure, and the rotating cylinder one and the rotating cylinder two have the same structure.

[0006] Preferably, the deflection frame is provided with a drive slide groove, and the clamping member includes a movable member that is slidably inserted into the drive slide groove. The movable member includes a round rod and a rectangular slider. The slider is welded to the round rod. The round rod is slidably inserted into the drive slide groove, and the slider is slidably inserted into the linear guide groove of the guide frame. The other end of the round rod is fixed to the clamping rod by a connecting plate. When the push rod of the clamping cylinder extends, it can cause the two deflecting frames to deflect upward through the straight rod. When the deflecting frames deflect upward, the deflecting frames will push the round rod and the slider along the straight guide groove towards the center of the deflecting frames through the drive slide groove. This will cause the three clamping rods to move synchronously and move closer to each other, thereby clamping the workpiece between them and keeping the workpiece in the center.

[0007] Preferably, the driving component includes a plurality of reset components 1 arranged in a ring array and mounted on the right fixed ring in the clamping structure 1. One end of the plurality of reset components 1 located outside the fixed ring is fixed to a driving ring. Three movable arc blocks arranged in a ring array are mounted on the side of the driving ring facing the fixed ring. A conical ring is fixed on the side of the driving ring away from the fixed ring. The reset component includes a reset rod that is slidably inserted into a fixed ring. One end of the reset rod is fixed to a drive ring, and the other end of the reset rod is fixed to a circular ring. A reset spring is sleeved on the reset rod. The two ends of the reset spring abut against the circular ring and the fixed ring, respectively. The reset spring causes the reset rod to always have an inward driving force, thereby causing the drive ring to always have a tendency to move towards the fixed ring.

[0008] Preferably, in the clamping structure one, a drive head is fixed at one end of the deflection rod facing the drive ring, the drive head passes through the deflection guide groove and is located at the right end of the outside of the rotating cylinder one, and a moving inclined surface is formed on the inclined surface of the moving arc block, and the drive head slides in contact with the moving arc block; When the push rod of the clamping cylinder retracts, the deflection frame and deflection rod are at their lowest position under the action of the clamping cylinder. At this time, the deflection rod contacts the bottom end of the deflection guide groove in the fixed ring. When the push rod of the clamping cylinder extends, the push rod of the clamping cylinder causes the two deflection frames to deflect upward through the straight rod. The drive head will move from the drive ring to the moving arc block through the moving inclined plane. The drive ring will move to the right a certain distance away from the fixed ring. At this time, the reset spring in the reset component is in a compressed state.

[0009] Preferably, the positioning structure includes a fixing frame fixed above the support frame. The fixing frame consists of two square blocks fixed by screws. The fixing frame has an arc-shaped insertion interface extending through the left and right sides. Two tubular workpieces can be directly inserted into the insertion interface for docking. The welding head is fixed above the fixing frame. The fixing frame extends through the top and bottom to form a welding port. The welding head is located inside the welding port, and the welding port is directly above the insertion interface. The fixed frame has a movable opening extending through it from front to back. A positioning block is slidably installed in the movable opening. A connector is installed on the front side of the fixed frame. The connector is fixed to the positioning block. A reset component is fixed on the fixed frame. The reset component is fixed to the connector. The right side surface of the positioning block is located at the center below the welding joint.

[0010] Preferably, the connector includes a linear rod, one end of which extends into the moving port and is fixed to the positioning block. The other end of the linear rod is integrally formed with a trapezoidal block. The upper inclined surface of the trapezoidal block is provided with a pushing inclined surface. When the driving ring and the conical ring move forward, the conical ring will contact the pushing inclined surface and cause the pushing inclined surface to move forward, thereby pulling the linear rod and the positioning block forward, so that the positioning block disengages from the insertion interface, which facilitates the contact of the two workpieces. Meanwhile, the conical ring design ensures that the drive component, regardless of its position, can maintain contact with the pushing inclined surface and propel it to move as the clamping structure and rotating cylinder rotate.

[0011] Preferably, the second reset component includes a fixing block fixed on a straight rod, a fixing rod slidably inserted into the fixing block, a tension spring sleeved on the fixing rod, and the two ends of the tension spring being connected to the fixing block and the fixing frame respectively. The tension spring causes the fixing block and the straight rod to always have a tendency to move backward. That is, without the action of other external forces, the tension spring will cause the straight rod and the positioning block to move backward, so that the positioning block moves into the insertion interface.

[0012] Preferably, a gear is fixed on the outer surface of the rotating cylinder, and a gear is rotatably mounted on the mounting shaft seat via a bearing seat. The gear meshes with the gear. A connecting groove is provided on the inner ring of the gear. The rotating structure includes a drive shaft rotatably mounted on the base via a bearing. A long connecting pin is fixed at the left end of the drive shaft. The gear is connected to the drive shaft, and the connecting pin is slidably placed in the connecting groove. When the mounting shaft seat moves the rotating cylinder above it left and right, the gear can move accordingly, and the connection between the gear and the drive shaft can be guaranteed. Gear 2 is fixed on the outer ring surface of the rotating cylinder 2, and gear 4 is mounted on the drive shaft. Gear 4 meshes with gear 2. One end of the drive shaft is connected to an external drive motor through a coupling for the rotation of the drive shaft.

[0013] The beneficial effects of this invention are: 1. Through the symmetrical design of clamping structure one and clamping structure two, the clamping components distributed in three ring arrays synchronously approach and clamp the workpiece, which can ensure that the workpiece is always at the central axis of the rotating cylinder, ensuring the coaxiality when the two tubular workpieces are joined. The positioning structure pre-positions the end of the workpiece through the positioning block. With the linkage design of the driving component and the clamping structure, the interface end of the workpiece is accurately aligned to the bottom of the welding head, effectively avoiding interface offset and misalignment problems. The weld is uniform and flat, significantly improving the welding quality. 2. The positioning structure ensures that the interface ends of the two workpieces are directly below the welding head when clamping and placing the two pipe fittings, improving welding accuracy. At the same time, the positioning structure works in tandem with the clamping structure through the driving component. During the clamping and fixing of the workpiece, the clamping structure moves the driving component through the deflection rod, thereby pushing the positioning block of the positioning structure to automatically disengage from the insertion interface. This ensures that the positioning block will disengage during the docking process of the other pipe fitting, thus ensuring that the two pipe fittings can be successfully docked. 3. The clamping structure uses a clamping cylinder to drive the deflection frame to deflect. Through the cooperation of the drive slide and the guide frame, the three sets of clamping parts synchronously clamp the workpiece. The clamping force is uniform and stable, which can effectively prevent the workpiece from loosening or shifting during welding rotation. In addition, the movement stroke of the clamping parts can be adjusted by the deflection angle of the deflection frame, which can adapt to tubular workpieces of different diameters. There is no need to change special fixtures, which is highly versatile and reduces production costs. 4. The rotating structure drives the first and second rotating cylinders to rotate synchronously through the transmission of the drive shaft and gear set. The third gear and the drive shaft are connected by a connecting pin and a connecting groove to ensure the continuity of the rotation drive when the mounting shaft seat moves left and right. The workpiece always maintains coaxial rotation during the rotation process, and the welding head can perform 360° all-round welding at the interface, with complete welds without dead corners, further improving the welding quality. Attached Figure Description

[0014] Figure 1 This is a front view of a positioning and clamping structure for a welding device proposed in this invention; Figure 2 for Figure 1 Axonometric projections of the front and rear angles; Figure 3 for Figure 1 The front view; Figure 4 for Figure 1 Exploded view; Figure 5 for Figure 2 A schematic diagram of the rotating cylinder and the clamping structure. Figure 6 for Figure 5 A schematic diagram of the first clamping structure; Figure 7 This is a schematic diagram of the clamping components, guide frame, and deflection frame in clamping structure one. Figure 8 for Figure 7 Exploded view; Figure 9 for Figure 4 Schematic diagram of the drive component and positioning structure; Figure 10 for Figure 9 Top view.

[0015] Numbering on the map: 1. Base; 11. Guide column; 12. Moving cylinder; 13. Support frame; 2. Mounting shaft seat one; 21. Rotating cylinder one; 22. Gear one; 3. Clamping Structure 1; 31. Fixing Ring; 311. Deflection Guide Groove; 32. Guide Frame; 321. Linear Guide Groove; 33. Deflection Frame; 331. Drive Slide Groove; 34. Clamping Component; 341. Moving Component; 342. Clamping Rod; 35. Deflection Rod; 351. Drive Head; 36. Clamping Cylinder; 4. Driving component; 41. Driving ring; 42. Moving arc block; 43. Moving inclined plane; 44. Reset component one; 45. Conical ring; 5. Positioning structure; 51. Fixing bracket; 511. Insertion interface; 52. Linear rod; 521. Pushing inclined plane; 53. Reset component two; 54. Positioning block; 6. Welding head; 7. Mounting bearing two; 71. Rotating cylinder two; 72. Gear two; 8. Clamping Structure Two; 9. Rotating structure; 91. Drive shaft; 911. Connecting pin; 92. Gear three; 921. Connecting groove; 93. Gear four. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0017] Reference Figure 1 - Figure 10 A positioning and clamping structure for a welding device includes a base 1. A mounting bearing 2 is slidably mounted on the upper left side of the base 1 via a guide post 11 and a sliding block. A moving cylinder 12 is mounted above the base 1, and the push rod of the moving cylinder 12 is fixed below the mounting bearing 2. A rotating cylinder 21 is rotatably mounted inside the mounting bearing 2 via a bearing. A clamping structure 3 for center positioning and clamping of the workpiece is mounted on the inner ring of the rotating cylinder 21. A second mounting bearing 7 is fixed on the upper right side of the base 1, and a rotating... Rotary cylinder 2 71 has a clamping structure 2 8 installed on its inner ring for center positioning and clamping of the workpiece. A rotating structure 9 is installed above the base 1 for rotating cylinder 1 21 and rotating cylinder 2 71. Two workpieces are fixed in the rotating cylinder 1 21 and rotating cylinder 2 71 respectively by clamping structure 1 3 and clamping structure 2 8. Then, clamping structure 1 3 drives the entire mounting shaft seat 1 2 and clamping structure 1 3 to move under the action of moving cylinder 12, so that the two workpieces can abut against each other, thus facilitating the welding of the two tubular workpieces together. A support frame 13 is fixed at the middle of the upper part of the base 1. The support frame 13 is located between the rotating cylinder 1 21 and the rotating cylinder 2 71. A positioning structure 5 for workpiece positioning and alignment is fixed above the support frame 13. The positioning structure 5 is linked with the clamping structure 1 3 through the driving component 4. A welding head 6 for workpiece welding is fixed above the positioning structure 5.

[0018] Reference Figure 6 - Figure 8The clamping structure 3 includes two fixed rings 31 and two deflection frames 33. The two fixed rings 31 are fixed to the left and right ends of the rotating cylinder 21, respectively. The fixed rings 31 have three sets of deflection guide grooves 311 arranged in annular array. The center of the deflection guide grooves 311 is collinear with the center of the fixed rings 31. The inner ends of the two fixed rings 31 are each screwed with three guide frames 32 arranged in annular array. The two deflection frames 33 are located at the inner ends of the two guide frames 32, and three deflection rods 35 arranged in annular array are fixed between the two deflection frames 33. The three deflection rods 35 slide... The three deflection guide grooves 311 of the fixed ring 31 are movably inserted into the fixed ring 31. Three sets of clamping members 34 arranged in a ring array are slidably installed between the two deflection frames 33, and the clamping members 34 are slidably connected to the corresponding guide frame 32. The inner wall of the rotating cylinder 21 is equipped with a clamping cylinder 36 through a bracket. The push rod of the clamping cylinder 36 is rotatably connected to the two deflection frames 33 through a straight rod. When the push rod of the clamping cylinder 36 is extended, the two deflection frames 33 can be deflected upward through the straight rod, and the deflection frames 33 can rotate along the deflection guide groove 311, so that the three clamping members 34 move closer to each other synchronously. Clamping structure 1 3 has the same structure as clamping structure 2 8, and rotating cylinder 1 21 has the same structure as rotating cylinder 2 71.

[0019] Reference Figure 7 , Figure 8 The deflection frame 33 is provided with a drive slide groove 331. The clamping member 34 includes a movable member 341 that is slidably inserted into the drive slide groove 331. The movable member 341 includes a round rod and a rectangular slider. The slider is welded to the round rod. The round rod is slidably inserted into the drive slide groove 331. The slider is slidably inserted into the straight guide groove 321 of the guide frame 32. The other end of the round rod is fixed to the clamping rod 342 through a connecting plate. When the push rod of the clamping cylinder 36 extends, it can cause the two deflecting frames 33 to deflect upward through the straight rod. When the deflecting frames 33 deflect upward, the deflecting frames 33 will push the round rod and the slider along the straight guide groove 321 towards the center of the deflecting frame 33 through the drive slide groove 331. This will cause the three clamping rods 342 to move synchronously and move closer to each other, thereby clamping the workpiece between them and keeping the workpiece in the center.

[0020] Reference Figure 9 , Figure 10 The driving component 4 includes multiple reset components 44 arranged in a ring array and mounted on the right fixed ring 31 in the clamping structure 3. The driving ring 41 is fixed at one end of the multiple reset components 44 outside the fixed ring 31. Three moving arc blocks 42 arranged in a ring array are mounted on the side of the driving ring 41 facing the fixed ring 31. A conical ring 45 is fixed on the side of the driving ring 41 away from the fixed ring 31. The reset component 44 includes a reset rod that is slidably inserted into the fixed ring 31. One end of the reset rod is fixed to the drive ring 41, and the other end of the reset rod is fixed with a circular ring. A reset spring is sleeved on the reset rod. The two ends of the reset spring abut against the circular ring and the fixed ring 31, respectively. The reset spring causes the reset rod to always have an inward driving force, thereby causing the drive ring 41 to always have a tendency to move toward the fixed ring 31.

[0021] Reference Figure 10 In the clamping structure 3, a drive head 351 is fixed at one end of the deflection rod 35 facing the drive ring 41. The drive head 351 passes through the deflection guide groove 311 and is located at the right end of the outside of the rotating cylinder 21. A moving inclined surface 43 is formed on the inclined surface of the moving arc block 42. The drive head 351 slides in contact with the moving arc block 42. When the push rod of the clamping cylinder 36 retracts, the deflection frame 33 and the deflection rod 35 are at the lowest position under the action of the clamping cylinder 36. At this time, the deflection rod 35 contacts the bottom end of the deflection guide groove 311 in the fixed ring 31. At the same time, the drive head 351 on the deflection rod 35 slides in contact with the left side surface of the drive ring 41. When the push rod of the clamping cylinder 36 extends, the push rod of the clamping cylinder 36 causes the two deflection frames 33 to deflect upward through the straight rod. At this time, the deflection rod 35 located on the deflection frame 33 will also deflect upward at the same time. That is, the drive head 351 will move from the drive ring 41 to the moving arc block 42 through the moving inclined surface 43. Since the moving arc block 42 has a certain thickness, while the overall length and left and right positions of the deflection rod 35 and the drive head 351 remain unchanged, the drive ring 41 will move to the right a certain distance away from the fixed ring 31. At this time, the reset spring in the reset component 44 is in a compressed state.

[0022] Reference Figure 9 , Figure 10 The positioning structure 5 includes a fixing frame 51 fixed above the support frame 13. The fixing frame 51 consists of two square blocks fixed by screws. The fixing frame 51 extends through the left and right sides to form an arc-shaped insertion interface 511. Two tubular workpieces can be directly inserted into the insertion interface 511 for docking. The welding head 6 is fixed above the fixing frame 51. The fixing frame 51 extends through the top and bottom to form a welding joint. The welding head 6 is located inside the welding joint, and the welding joint is located directly above the insertion interface 511. The fixed frame 51 has a moving opening that extends through the front and rear. A positioning block 54 is slidably installed in the moving opening. A connector is installed on the front side of the fixed frame 51. The connector is fixed to the positioning block 54. A reset component 2 53 is fixed on the fixed frame 51. The reset component 2 53 is fixed to the connector. The right side surface of the positioning block 54 is located at the center below the welding joint. In actual use, the positioning block 54 is located inside the insertion interface 511. A tubular workpiece is inserted into the clamping structure 2 8 on the right side and clamped and fixed by the clamping structure 2 8, so that the left end of the tubular workpiece abuts against the positioning block 54. Then, another tubular workpiece is inserted into the clamping structure 1 3 on the left side and the clamping structure 1 3 fixes the left end of the tubular workpiece. Then, the positioning block 54 is disengaged from the insertion interface 511, and the tubular workpiece abuts against the tubular workpiece on the right side. This ensures that the interface ends of the two workpieces are directly below the welding head 6, which facilitates the welding head 6 to weld the two workpieces together.

[0023] The connector includes a linear rod 52, one end of which extends into the moving port and is fixed to the positioning block 54. The other end of the linear rod 52 is integrally formed with a trapezoidal block. The inclined surface of the trapezoidal block is provided to form a pushing inclined surface 521. When the drive ring 41 and the conical ring 45 move forward, the conical ring 45 will contact the pushing inclined surface 521 and cause the pushing inclined surface 521 to move forward, thereby pulling the linear rod 52 and the positioning block 54 forward, so that the positioning block 54 disengages from the insertion interface 511, which facilitates the contact of the two workpieces. At the same time, the design of the conical ring 45 also ensures that the drive component 4, when rotating with the clamping structure 3 and the rotating cylinder 21, can always ensure that the conical ring 45 contacts the pushing inclined surface 521 and pushes it to move, regardless of its position.

[0024] The second reset component 53 includes a fixing block fixed on the linear rod 52. A fixing rod is slidably inserted into the fixing block, and a tension spring is sleeved on the fixing rod. The two ends of the tension spring are connected to the fixing block and the fixing frame 51, respectively. The tension spring causes the fixing block and the linear rod 52 to always have a tendency to move backward. That is, without the action of other external forces, the tension spring will cause the linear rod 52 and the positioning block 54 to move backward, so that the positioning block 54 moves into the insertion interface 511.

[0025] Reference Figure 1 - Figure 5 Gear 22 is fixed on the outer surface of the rotating cylinder 21. Gear 3 92 is rotatably mounted on the mounting shaft seat 2 via a bearing seat. Gear 3 92 meshes with gear 22. A connecting groove 921 is provided on the inner ring of gear 3 92. The rotating structure 9 includes a drive shaft 91 rotatably mounted on the base 1 via a bearing. A long strip connecting pin 911 is fixed at the left end of the drive shaft 91. Gear 3 92 is connected to the drive shaft 91, and the connecting pin 911 is slidably placed in the connecting groove 921. When the mounting shaft seat 2 drives the rotating cylinder 21 above to move left and right, gear 3 92 can move accordingly and can ensure the connection between gear 3 92 and drive shaft 91. Gear 2 72 is fixed on the outer surface of the rotating cylinder 2 71, and gear 4 93 is installed on the drive shaft 91. Gear 4 93 meshes with gear 2 72. One end of the drive shaft 91 is connected to an external drive motor through a coupling for the rotation of the drive shaft 91.

[0026] Working principle: In the initial state, the push rod of the clamping cylinder 36 is in the retracted state. At this time, the deflection frame 33 and the deflection rod 35 are at the lowest position under the action of the clamping cylinder 36. At this time, the deflection rod 35 is in contact with the bottom end of the deflection guide groove 311 in the fixed ring 31. At the same time, the drive head 351 on the deflection rod 35 is in sliding contact with the left side surface of the drive ring 41. At this time, the drive ring 41 is closest to the fixed ring 31. Meanwhile, the conical ring 45 is away from the pushing inclined surface 521. The straight rod 52 drives the positioning block 54 to be inserted into the insertion interface 511 under the action of the reset component 53. At this time, the right side surface of the positioning block 54 is at the center below the welding joint.

[0027] In actual use, first insert a tubular workpiece into the clamping structure 28 on the right side, and make the left end of the tubular workpiece abut against the positioning block 54. Then turn on the power supply of the clamping cylinder 36 in the clamping structure 28, and clamp and fix it through the clamping structure 28. Specifically, the power supply to the clamping cylinder 36 is turned on and it is extended. When the push rod of the clamping cylinder 36 is extended, the push rod of the clamping cylinder 36 causes the two deflection frames 33 to deflect upward through the straight rod. The deflection frames 33 will push the round rod and the slider along the straight guide groove 321 towards the center of the deflection frame 33 through the drive slide groove 331. This causes the three clamping rods 342 to move synchronously and move closer to each other, thereby clamping the workpiece between them and keeping the workpiece in the center, thus completing the clamping and fixing of the workpiece on the right. Then, another tubular workpiece is inserted into the clamping structure 3 on the left side. The tubular workpiece on the left end is fixed by the clamping structure 3. The fixing method of the workpiece by the clamping structure 3 is the same as that of the clamping structure 8. Furthermore, during the clamping and fixing of the workpiece using clamping structure 3, the push rod of clamping cylinder 36 causes the two deflection frames 33 to deflect upwards via the straight rod. At this time, the deflection rod 35 located on the deflection frame 33 will also deflect upwards simultaneously. That is, the drive head 351 will move from the drive ring 41 to the moving arc block 42 via the moving inclined surface 43. Since the moving arc block 42 has a certain thickness, while the overall length and left and right positions of the deflection rod 35 and the drive head 351 remain unchanged, the drive ring 41 will move to the right a certain distance away from the fixed ring 31. When the drive ring 41 and the conical ring 45 move forward, the conical ring 45 will contact the pushing inclined surface 521 and cause the pushing inclined surface 521 to move forward, thereby pulling the straight rod 52 and the positioning block 54 to move forward, so that the positioning block 54 disengages from the insertion interface 511. After the positioning block 54 disengages from the insertion interface 511, the two workpieces can abut against each other. Next, by moving the cylinder 12, the entire mounting shaft seat 2 and clamping structure 3 are moved to the right, and the workpiece in the clamping structure 3 will also move to the right until the two workpieces come into contact with each other. At this time, the interface ends of the two workpieces are directly below the welding head 6, so that the welding head 6 can weld the two workpieces together. Finally, the power supply to the drive motor can be turned on. The drive motor will cause the two rotating cylinders 21 and 71 to rotate synchronously through the drive shaft 91, and the welding head 6 can then perform all-round welding on the interface of the workpiece.

[0028] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] 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 positioning and clamping structure for a welding device, characterized by, The utility model provides a center positioning and clamping device for workpiece, including base (1), the left side upper portion of base (1) is installed with installation shaft seat no. (2) through guide column (11), sliding block left and right sliding, the upper portion of base (1) is installed with mobile air cylinder (12), the push rod of mobile air cylinder (12) is fixed below installation shaft seat no. (2), the inside rotation of installation shaft seat no. (2) is installed with rotating cylinder no. (21) through bearing, the inner ring of rotating cylinder no. (21) is installed with the clamping structure no. (3) for workpiece center positioning and clamping, the upper portion right side of base (1) is fixed with installation shaft seat no. (7), the inside rotation of installation shaft seat no. (7) is installed with rotating cylinder no. (71) through bearing, the inner ring of rotating cylinder no. (71) is installed with the clamping structure no. (8) for workpiece center positioning and clamping, the upper portion of base (1) is installed with the rotation structure (9) for rotating cylinder no. (21), rotating cylinder no. (71) rotation, The upper portion of base (1) is fixed with support frame (13) in the middle, and support frame (13) is located between rotating cylinder no. (21) and rotating cylinder no. (71), the upper portion of support frame (13) is fixed with the positioning structure (5) for workpiece positioning alignment, the positioning structure (5) is linked with the clamping structure no. (3) through drive part (4) setting, the upper portion of positioning structure (5) is fixed with the welding head (6) for workpiece welding.

2. The positioning and clamping structure for a welding device according to claim 1, wherein The clamping structure no. (3) includes two fixed rings (31) and two deflection frames (33), two fixed rings (31) are fixed at the left and right ends of rotating cylinder no. (21) respectively, three groups of annular array distribution deflection guide grooves (311) are formed in the fixed ring (31), the inner side end of two fixed rings (31) is screw-fixed three annular array distribution guide frames (32), two deflection frames (33) are respectively at the inner side end of two guide frames (32), and three annular array distribution deflection rods (35) are fixed between two deflection frames (33), three deflection rods (35) are respectively slidably inserted into three deflection guide grooves (311) of the fixed ring (31), three groups of annular array distribution clamping pieces (34) are slidably installed between two deflection frames (33), and the clamping piece (34) is slidably connected with the corresponding guide frame (32), the clamping cylinder (36) is installed on the inner wall of rotating cylinder no. (21) through a support, and the push rod of the clamping cylinder (36) is rotatably connected with two deflection frames (33) through a straight rod. The clamping structure no. (3) and the clamping structure no. (8) are the same structure, and the rotating cylinder no. (21) and the rotating cylinder no. (71) are the same structure.

3. The positioning and clamping structure for a welding device according to claim 2, wherein The deflection frame (33) is provided with a drive sliding groove (331), the clamping piece (34) includes a moving piece (341) slidably inserted into the drive sliding groove (331), the moving piece (341) includes a round rod and a rectangular structure sliding block, the sliding block is welded on the round rod, the round rod is slidably inserted into the drive sliding groove (331), the sliding block is slidably inserted into the linear guide groove (321) of the guide frame (32), and the other end of the round rod is fixed with a clamping rod (342) through a connecting plate.

4. The positioning and clamping structure for a welding device according to claim 2, wherein The driving member (4) comprises a plurality of reset members I (44) installed in an annular array on the right fixing ring (31) in the clamping structure I (3), a driving ring (41) is fixed at one end of the plurality of reset members I (44) outside the fixing ring (31), three annular array distributed moving arc blocks (42) are installed on one side of the driving ring (41) facing the fixing ring (31), and a tapered ring (45) is fixed on one side of the driving ring (41) away from the fixing ring (31).

5. The positioning and clamping structure for a welding device according to claim 4, wherein The deflection rod (35) in the clamping structure I (3) is fixed with a driving head (351) at one end facing the driving ring (41), the driving head (351) passes through the deflection guide groove (311) and is outside the right end of the rotating cylinder I (21), the moving slope (43) is formed by the inclined surface of the moving arc block (42), and the driving head (351) is in sliding contact with the moving arc block (42).

6. The positioning and clamping structure for a welding device according to claim 1, wherein The positioning structure (5) comprises a fixing frame (51) fixed above the support frame (13), the fixing frame (51) is formed with an arc-shaped structure insertion port (511) penetrating left and right, the welding head (6) is fixed above the fixing frame (51), the fixing frame (51) is formed with a welding port penetrating up and down, the welding head (6) is in the welding port, and the welding port is directly above the insertion port (511); The fixing frame (51) is formed with a moving port penetrating front and back, the positioning block (54) is slidably installed in the moving port, the fixing frame (51) is provided with a connecting piece on the front side, the connecting piece is fixed with the positioning block (54), and the fixing frame (51) is fixed with a reset member II (53), and the reset member II (53) is fixed with the connecting piece.

7. The positioning and clamping structure for a welding device according to claim 6, wherein The connecting piece comprises a straight rod (52), one end of the straight rod (52) extends into the moving port and is fixed with the positioning block (54), and the other end of the straight rod (52) is integrally formed with a trapezoidal block, and the pushing slope (521) is formed by the inclined surface of the trapezoidal block.

8. The positioning and clamping structure for a welding device according to claim 6, wherein The reset member II (53) comprises a fixing block fixed on the straight rod (52), a fixing rod is slidably inserted into the fixing block, a tension spring is sleeved on the fixing rod, and the two ends of the tension spring are connected with the fixing block and the fixing frame (51) respectively.

9. The positioning and clamping structure for a welding device according to claim 1, wherein The rotating cylinder I (21) is fixed with a gear I (22) on the outer surface, the mounting shaft seat I (2) is rotatably mounted with a gear III (92) through a bearing seat, the gear III (92) is engaged with the gear I (22), the gear III (92) is provided with a connecting sliding groove (921) in the inner circle, the rotating structure (9) comprises a driving shaft (91) rotatably mounted above the base (1) through a bearing, the left end of the driving shaft (91) is fixed with an elongated connecting pin (911), the gear III (92) is connected with the driving shaft (91), and the connecting pin (911) is slidably arranged in the connecting sliding groove (921); The rotating cylinder II (71) is fixed with a gear II (72) on the outer surface, and the driving shaft (91) is provided with a gear IV (93), and the gear IV (93) is engaged with the gear II (72).

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