Cylindrical circumferential weld torch clamping device

Abstract

The present invention is a clamping device for a circular seam welding torch of a cylinder, which includes a fixed disk inserted into the cylinder. A ball is clamped on the outer wall of the fixed disk and is in rolling connection with the inner wall of the cylinder. The upper end of the fixed disk is connected with an annular limiting disk through a connecting rod, and the lower end surface of the limiting disk abuts against the upper end surface of the cylinder. A ball is also clamped on the lower end surface of the limiting disk and is in rolling connection with the upper end surface of the drum. Two symmetrically arranged clamps are provided at the upper end of the fixed disk for fixing the welding torch. The clamps extend backward with screw rods, and a support plate is arranged on the upper end surface of the fixed disk. The screw rods are inserted into the support plates to achieve rotational connection. A locking nut is also threadedly connected to the screw rods for locking and fixing the screw rods. A rotatably connected suction cup is arranged at the lower end of the fixed disk for adsorbing a circular plate. The welding torch is fixed on the fixed disk, with a stable position, and there will be no phenomenon of missed welding or excessive welding during welding.

Description

Technical Field

[0001] The present invention relates to the technical field of welding machines, and specifically to a welding torch clamping device for circular seam welding of cylinders. Background Art

[0002] There is a cylinder, and a coaxial circular plate needs to be welded inside it (refer to Figure 14 ). The welding process is that the tip of the welding torch abuts against the connection between the circular plate and the cylinder, and the cylinder rotates one circle to complete the circular seam welding.

[0003] When the cylinder is relatively long, it is difficult for workers to reach the welding position by holding the welding torch and extending it into the cylinder. The conventional process to solve this difficulty is to first fix the welding torch on an extension rod, and the worker holds the extension rod and extends it into the cylinder for welding.

[0004] Since the extension rod is relatively long, not only is the stability poor, but the vision is also poor, resulting in the welding torch being prone to shaking and misalignment during welding, leading to phenomena such as missed welding and excessive welding.

[0005] Therefore, how to overcome the above defects has become an urgent problem for those skilled in the art to solve. Summary of the Invention

[0006] To solve the technical problems in the background art, the present invention discloses a welding torch clamping device for circular seam welding of cylinders.

[0007] The present invention provides a welding torch clamping device for circular seam welding of cylinders, including a fixed disk, which is coaxial with the vertically arranged cylinder and is inserted into the cylinder;

[0008] The outer wall of the fixed disk is clamped with rolling balls, which are in rolling connection with the inner wall of the cylinder;

[0009] The upper end of the fixed disk is connected with an annular limiting disk through a connecting rod, and the lower end face of the limiting disk abuts against the upper end face of the cylinder; rolling balls are also clamped on the lower end face of the limiting disk, which are in rolling connection with the upper end face of the cylinder;

[0010] Two symmetrically arranged and oppositely opened clamps are arranged at the upper end of the fixed disk for fixing the welding torch;

[0011] The clamp extends backward with a screw rod, and a support plate is arranged on the upper end face of the fixed disk; the screw rod is inserted into the support plate to achieve rotational connection;

[0012] A locking nut is also threadedly connected to the screw rod for locking and fixing the screw rod;

[0013] A rotatably connected suction cup is arranged at the lower end of the fixed disk for adsorbing the circular plate.

[0014] The welding process of the above setting is as follows: 1. Use a suction cup to adsorb the circular plate and make the circular plate coaxial with the fixed ring; 2. Adjust the position of the clamping hoop to fix the welding torch, and adjust the angle between the welding torch and the horizontal plane so that the welding end of the welding torch abuts against the edge of the circular plate; 3. The manipulator grabs the limit ring and sends the welding torch into the cylinder until the limit ring abuts against the upper end of the cylinder; 4. Start the welding torch and the mechanism for driving the cylinder to rotate simultaneously, so that the cylinder rotates one week; 5. The manipulator grabs the limit ring and moves upward, and the suction cup is separated from the circular plate.

[0015] The beneficial effects of the above setting are as follows: 1. The welding torch is fixed on the fixed disk, with a stable position, and there will be no phenomenon of missed welding or excessive welding during welding; 2. When the cylinder rotates, since both the fixed ring and the limit ring are in rolling connection with the cylinder, the fixed ring and the limit ring will not rotate with the cylinder under the grasping action of the manipulator and will not cause wear to the cylinder; 3. The disk is fixed at the lower end of the fixed disk and follows to be placed into the cylinder. Only the girth welding process needs to be carried out to fix it. Compared with the method of first spot-welding the circular plate and then carrying out girth welding, the process is simplified; 4. Adjust the position of the welding torch first and then insert the welding torch into the cylinder, which is convenient for adjusting the position of the welding torch and improves the position accuracy of the welding torch.

[0016] The specific structure of the connection between the suction cup and the fixed disk for rotation is as follows: Axially arranged bearing seats are provided at the lower end of the fixed disk, and bearings are clamped at both ends of the bearing seats; the rotating shaft is inserted into the bearings; the upper end of the suction cup is inserted into the rotating shaft and is in threaded connection with the rotating shaft.

[0017] Since the suction cup grabs the circular plate, it is difficult to ensure that the circular plate and the fixed disk are in the coaxial position, and there will be a position deviation. In this way, it is difficult to insert the circular plate and the fixed disk into the cylinder. Based on this, a further improvement is as follows: An adjusting ring is provided at the lower end of the fixed disk; a concave platform is provided at the upper end of the adjusting ring; a flexible rubber ring is clamped in the concave platform; a clamping ring extending radially outward is provided at the upper end of the bearing seat, and the clamping ring is inserted into the rubber ring and is clamped with the concave platform. The setting of the rubber ring enables the bearing seat to float radially. When the circular plate is inserted into the cylinder and the fixed ring is difficult to be inserted into the cylinder due to position deviation, the radial position of the bearing seat can be adjusted to the position coaxial with the fixed ring, so that the fixed ring can stably enter the cylinder.

[0018] If the adjusting ring is set as an integral structure, it will lead to a relatively high installation difficulty of the bearing seat. Based on this, a further improvement is as follows: The adjusting ring is composed of two symmetrically arranged ring petals spliced together.

[0019] Merely adjusting the angle of the welding torch and the position of the clamp for sandwiching the welding torch makes it difficult to accurately and quickly adjust the welding torch to the welding position. Even, the position between the welding torch and the edge of the round tube may be too far. No matter how it is adjusted, the welding torch cannot be adjusted to the welding position. Based on this, a further improvement lies in that: a U-shaped chute opening outward is provided on the fixed disk; clamping grooves are arranged on both sides of the slider to be clamped with the side walls of the chute, so that the slider can move; a support plate is arranged at the upper end of the slider. The beneficial effects of such a setting are as follows: 1. The slider is clamped with the side walls of the chute to realize the movement guiding of the slider, so that the welding torch will not have a position deviation during welding; 2. The setting of the chute enables the welding torch to be inserted into the chute during adjustment, thereby providing sufficient adjustment space for the welding torch and facilitating the adjustment of the welding torch.

[0020] To further improve the position stability of the slider and avoid relative sliding of the slider during welding, based on this, a further improvement lies in that: a plurality of positioning holes are arranged on both sides of the chute; a positioning pin passes through the slider and is inserted into the positioning hole to fix the slider.

[0021] Since the slider is arranged at the upper end of the fixed disk and there is no operating space for the positioning pin, the positioning pin can only be arranged at the lower end of the fixed disk. In this way, the positioning pin is likely to fall off under the action of gravity and vibration. Based on this, a further improvement lies in that: a guide cylinder is arranged at the lower end of the fixed disk; the upper end of the guide cylinder abuts against the lower end of the fixed disk and is provided with a radially inward extending guide plate; the upper end of the positioning pin is inserted into the positioning hole; a radially extending limiting plate is arranged at a position near the upper end of the positioning pin; a compression spring is sleeved on the positioning pin, its upper end abuts against the limiting plate, and its lower end abuts against the guide plate.

[0022] Since the connecting rod is relatively long and has a large flexibility, the limiting disk is likely to have a radial displacement, resulting in the balls on the limiting disk detaching from the cylinder and friction occurring between the limiting disk and the cylinder. Based on this, a further improvement lies in that: a plurality of rotationally symmetric limiting blocks extend downward from the outer wall of the limiting disk; balls are clamped inside the limiting blocks and are in rolling connection with the outer wall of the cylinder.

[0023] Since the welding position of the round plate will change, the insertion depth of the round plate needs to be adjustable. Based on this, a further improvement lies in that: the lower end of the connecting rod is fixedly connected to the fixed disk, and the upper end is a threaded rod and passes upward through the limiting disk; an adjusting nut threadedly connected to the threaded rod is arranged at the upper end of the limiting disk; it is used to adjust the distance between the fixed disk and the limiting disk.

[0024] The beneficial effects of the present invention are as follows: 1. The welding torch is fixed on the fixed disk, with a stable position, and there will be no phenomenon of missed welding or excessive welding during welding; 2. When the cylinder rotates, since both the fixed ring and the limiting ring are in rolling connection with the cylinder, the fixed ring and the limiting ring will not rotate with the cylinder under the grasping action of the manipulator, nor will they cause wear to the cylinder; 3. The disk is fixed at the lower end of the fixed disk and follows to be placed into the cylinder, and only the girth welding process needs to be carried out for fixation. Compared with the method of first spot-welding the disk and then performing girth welding, the process is simplified; 4. First adjust the position of the welding torch, and then insert the welding torch into the cylinder, which is convenient for adjusting the position of the welding torch and improving the position accuracy of the welding torch. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below with reference to the drawings and embodiments.

[0026] Figure 1 is a schematic structural view of the present invention;

[0027] Figure 2 is a top view of the present invention;

[0028] Figure 3 is Figure 2 a sectional view taken along A-A in

[0029] Figure 4 is Figure 3 an enlarged view at C in

[0030] Figure 5 is Figure 3 an enlarged view at D in

[0031] Figure 6 is a schematic structural view of the present invention with the cylinder hidden;

[0032] Figure 7 is Figure 6 an enlarged view at K in

[0033] Figure 8 is a schematic structural view of another perspective of the present invention with the cylinder hidden;

[0034] Figure 9 is Figure 8 an enlarged view at E in

[0035] Figure 10 is a front view of the present invention with the cylinder hidden;

[0036] Figure 11 is Figure 10 a sectional view taken along F-F in

[0037] Figure 12 is Figure 11 a sectional view taken along G-G in

[0038] Figure 13 is Figure 12 An enlarged view of the position H in the figure;

[0039] Figure 14 is a sectional view of the connection structure between the cylinder and the circular plate;

[0040] Figure 15 is Figure 4 An enlarged view of the position B in the figure;

[0041] In the figure: 1. Fixed disk; 2. Cylinder; 3. Ball; 4. Connecting rod; 5. Limit disk; 6. Hoop; 7. Welding torch; 8. Support plate; 9. Locking nut; 10. Suction cup; 11. Circular plate; 12. Bearing seat; 13. Adjusting ring; 14. Rotating shaft; 15. Concave platform; 16. Rubber ring; 17. Snap ring; 18. Chute; 19. Slide block; 20. Card slot; 21. Positioning pin; 22. Guide cylinder; 23. Guide plate; 24. Limit plate; 25. Limit block; 26. Adjusting nut; 27. Positioning hole; 28. Compression spring; 61. Screw rod; 131. Ring flap. Detailed implementation manners

[0042] Now, the present invention will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present invention in a schematic manner, so they only show the components related to the present invention.

[0043] As Figures 1-9 shown, the present invention discloses a welding torch clamping device for circular seam welding of a cylinder, including a circular fixed disk 1, which is coaxial with a vertically arranged cylinder 2 and is inserted into the cylinder 2. The outer wall of the fixed disk 1 is clamped with balls 3, which are in rolling connection with the inner wall of the cylinder 2.

[0044] The fixed disk 1 is provided with a U-shaped chute 18 with an opening facing outwards. The slide block 19 is in the shape of a "worker", and clamping grooves 20 are arranged on both sides thereof, which are clamped with the chute 18, so that the slide block 19 can slide directionally along the chute 18.

[0045] The slide block 19 is provided with a weight-reducing hole along the moving direction for reducing the weight of the slide block 19 and reducing the cost. Both ends of the slide block 19 are provided with symmetrically arranged support plates 8 extending in the vertical direction. Two symmetrically arranged hoops 6 with opposite openings are installed on the slide block 19 for clamping and fixing the welding torch 7. The hoops 6 are connected and fixed by bolts and nuts.

[0046] The slide block 19 is provided with an avoidance groove penetrating through the upper and lower sides and having the same opening direction as the chute 18. The welding torch 7 is inserted into the avoidance groove, so that when the welding torch 7 adjusts the angle with the horizontal plane, there is enough adjustment space and it will not collide with the slide block 19.

[0047] The hoop 6 extends backward with a screw rod 61. The screw rod 61 is inserted into the support plate 8 to achieve rotational connection, so that the angle between the welding torch 7 and the horizontal plane can be adjusted. A locking nut 9 is also threadedly connected to the screw rod 61. The locking nut 9 abuts against the outer side surface of the support plate 8 and is locked by it to fix the position of the welding torch 7.

[0048] Thus, the welding torch 7 adjusts its horizontal position through the slider 19, adjusts its angle with the horizontal plane by rotating the hoop 6, and adjusts its height by clamping different positions of the welding torch 7 by the hoop 6, so that the welding end of the welding torch 7 can accurately abut against the connection between the circular plate 11 and the cylinder 2.

[0049] A plurality of positioning holes 27 are also provided on the outer side of the sliding groove 18. The positioning holes 27 are arranged in two rows and are parallel to the groove wall of the sliding groove 18. As Figures 10-13 shown, a guide cylinder 22 is provided at the lower end of the fixed disk 1; the upper end of the guide cylinder 22 abuts against the fixed disk 1, and the lower end is provided with a radially inward extending guide plate 23; the upper end of the positioning pin 21 is inserted into the positioning hole 27; a radially extending limiting plate 24 is provided at a position near the upper end of the positioning pin 21; a compression spring 28 is sleeved on the positioning pin 21, its upper end abuts against the limiting plate 24, and the lower end abuts against the guide plate 23. When the slider 19 adjusts its position, the positioning pin 21 is pulled downward so that the positioning pin 21 disengages from the positioning hole 27; when the position adjustment of the slider 19 is completed, the positioning pin 21 is released, and the positioning pin 21 automatically inserts into the positioning hole 27 under the action of the compression spring 28. Such a setting not only simplifies the operation of moving the positioning pin 21 upward, but also can prevent the positioning pin 21 from falling downward under the action of gravity and vibration.

[0050] As Figure 4 and Figure 15 shown, the lower end of the fixed disk 1 is connected with a coaxially arranged adjusting ring 13. The upper end of the adjusting ring 13 is provided with a recessed concave platform 15; a flexible rubber ring 16 is clamped in the concave platform 15. The outer wall of the rubber ring 16 abuts against the side wall of the concave platform 15, and there is a gap between the inner wall and the inner wall of the concave platform 15. The upper end of the bearing seat 12 is provided with a radially outward extending snap ring 17. The snap ring 17 is inserted into the rubber ring 16 and is clamped with the concave platform 15. Bearings are clamped at both ends of the bearing seat 12; the rotating shaft 14 is inserted into the bearings; the upper end of the suction cup 10 is inserted into the rotating shaft 14 and is threadedly connected with the rotating shaft 14. The suction cup 10 is used to adsorb the circular plate 11. In other embodiments, the suction cup 10 can also be replaced with a magnet. The setting of the rubber ring 16 enables the bearing seat 12 to float radially. When the circular plate 11 is inserted into the cylinder 2 and the fixing ring is difficult to insert into the cylinder 2 due to position deviation, the radial position of the bearing seat 12 can be adjusted to a position coaxial with the fixing ring, so that the fixing ring can stably enter the cylinder 2.

[0051] The adjusting ring 13 is composed of two symmetrically arranged ring petals 131 spliced together. With this setting, first install one of the ring petals 131, then snap the rubber ring 16 and the bearing seat 12 into this ring petal, and then install the other ring petal 131, which facilitates installation.

[0052] The upper end of the fixed disk 1 is connected with an annular limiting disk 5 through a connecting rod 4. The lower end face of the limiting disk 5 abuts against the upper end face of the cylinder 2; the lower end face of the limiting disk 5 is also snap-connected with rolling balls 3 and is in rolling connection with the upper end face of the cylinder 2.

[0053] The lower end of the connecting rod 4 is fixed to the fixed disk 1. Specifically, the lower end of the connecting rod 4 is provided with an external thread and is thread-connected with two connecting nuts. The connecting nuts respectively abut against the upper and lower side faces of the fixed disk 1, and through their tightening, the lower end of the connecting rod 4 is fixed.

[0054] The upper end of the connecting rod 4 is a threaded rod and passes upward through the limiting disk 5; an adjusting nut 26 is provided at the upper end of the limiting disk 5 and is thread-connected with the threaded rod; by screwing the adjusting nut 26, the distance between the fixed disk 1 and the limiting disk 5 can be adjusted, so that the circular plate 11 is located at the accurate welding position.

[0055] Since the connecting rod 4 is relatively long and has a large flexibility, the limiting disk 5 is prone to radial displacement, resulting in the rolling balls 3 on the limiting disk 5 being separated from the cylinder 2 and friction occurring between the limiting disk 5 and the cylinder 2. Therefore, a plurality of rotationally symmetric limiting blocks 25 extend downward from the outer wall of the limiting disk 5; the inner side of the limiting block 25 is snap-connected with the rolling balls 3 and is in rolling connection with the outer wall of the cylinder 2.

[0056] The welding process with the above settings is as follows: 1. Use the suction cup 10 to adsorb the circular plate 11 and make the circular plate 11 coaxial with the fixed ring; 2. Adjust the position of the clamp 6 to fix the welding torch 7, and adjust the angle between the welding torch 7 and the horizontal plane so that the welding end of the welding torch 7 abuts against the edge of the circular plate 11; 3. The manipulator grabs the limiting ring and sends the welding torch 7 into the cylinder 2 until the limiting ring abuts against the upper end of the cylinder 2; 4. Start the welding torch 7 and the mechanism for driving the cylinder 2 to rotate simultaneously, so that the cylinder 2 rotates one week; 5. The manipulator grabs the limiting ring and moves upward, and the suction cup 10 is separated from the circular plate 11.

[0057] Compared with the prior art, the beneficial effects of this embodiment are as follows: 1. The welding torch 7 is fixed on the fixed disk 1, with a stable position, and there will be no phenomenon of missed welding or excessive welding during welding; 2. When the cylinder 2 rotates, since both the fixed ring and the limit ring are in rolling connection with the cylinder 2, the fixed ring and the limit ring will not rotate following the cylinder 2 under the grasping action of the manipulator, nor will they cause wear to the cylinder 2; 3. The disk is fixed at the lower end of the fixed disk 1 and follows to be placed into the cylinder 2. Only the circumferential seam welding process is required for fixation. Compared with the method of first spot-welding the disk and then performing circumferential seam welding, the process is simplified; 4. First adjust the position of the welding torch 7, and then insert the welding torch 7 into the cylinder 2, which is convenient for adjusting the position of the welding torch 7 and improves the position accuracy of the welding torch 7.

[0058] Inspired by the above ideal embodiment based on the present invention, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A cylindrical girth welding gun clamping device, characterized in that: It comprises a fixed plate (1) which is coaxial with a vertically arranged cylinder (2) and is inserted into the cylinder (2); The outer wall of the fixed plate (1) is clamped with a ball (3) which is rollingly connected to the inner wall of the cylinder (2); The upper end of the fixed plate (1) is connected to a circular limiting plate (5) via a connecting rod (4), and the lower end surface of the limiting plate (5) abuts against the upper end surface of the cylinder (2); the lower end surface of the limiting plate (5) is also clamped with a ball (3) and is rollingly connected to the upper end surface of the cylinder (2); The upper end of the fixing plate (1) is provided with two symmetrically arranged clamps (6) with openings facing each other, which are used to fix the welding gun (7); A screw rod (61) extends backward from the clamp (6), and a support plate (8) is provided on the upper end surface of the fixing plate (1); the screw rod (61) is inserted into the support plate (8) to achieve a rotational connection; The screw rod (61) is also threadedly connected with a locking nut (9) for locking and fixing the screw rod (61); A rotatably connected suction cup (10) is provided at the lower end of the fixed plate (1) for adsorbing the circular plate (11); The lower end of the fixed plate (1) is provided with an axially arranged bearing seat (12), and bearings are clamped at both ends of the bearing seat (12); The rotating shaft (14) is inserted into the bearing; The upper end of the suction cup (10) is inserted into the rotating shaft (14) and is threadedly connected to the rotating shaft (14); An adjustment ring (13) is provided at the lower end of the fixed plate (1); The upper end of the adjusting ring (13) is provided with a concave platform (15); A flexible rubber ring (16) is clamped inside the concave platform (15); The upper end of the bearing seat (12) is provided with a snap ring (17) extending radially outward, and the snap ring (17) is inserted into the rubber ring (16) and snap-fitted with the concave platform (15); The adjustment ring (13) is composed of two symmetrically arranged ring petals (131) spliced ​​together; The fixed plate (1) is provided with a U-shaped sliding groove (18) with an opening facing outwards; The slider (19) is provided with clamping grooves (20) on both sides thereof, which are clamped with the side walls of the slide groove (18) so that the slider (19) can move; The support plate (8) is arranged at the upper end of the slider (19); A plurality of positioning holes (27) are provided on both sides of the slide groove (18); The positioning pin (21) passes through the slider (19) and is inserted into the positioning hole (27) to fix the slider (19); A guide cylinder (22) is provided at the lower end of the fixed plate (1); The upper end of the guide cylinder (22) abuts against the lower end of the fixed plate (1), and is provided with a guide plate (23) extending radially inward; The upper end of the positioning pin (21) is inserted into the positioning hole (27); A radially extending limiting plate (24) is provided near the upper end of the positioning pin (21); The compression spring (28) is sleeved with the positioning pin (21), with its upper end abutting against the limiting plate (24) and its lower end abutting against the guide plate (23); The outer wall of the limiting plate (5) is provided with a plurality of rotationally symmetrical limiting blocks (25) extending downwardly; The inner side of the limit block (25) is clamped with a ball (3) which is rollingly connected to the outer wall of the cylinder (2); The lower end of the connecting rod (4) is fixedly connected to the fixed plate (1), and the upper end is a threaded rod that passes through the limit plate (5) upwards; An adjusting nut (26) threadedly connected to the threaded rod is provided at the upper end of the limiting plate (5); the nut is used to adjust the distance between the fixing plate (1) and the limiting plate (5).

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