Welding gun clamping device for circular seam welding of cylinder

Abstract

The invention relates to a cylinder girth welding gun clamping device which comprises a fixing disc inserted into a cylinder. Balls are clamped on the outer wall of the fixed disc and are in rolling connection with the inner wall of the cylinder; the upper end of the fixing disc is connected with an annular limiting disc through a connecting rod, and the lower end face of the limiting disc abuts against the upper end face of the cylinder; balls are also clamped on the lower end surface of the limiting disc and are in rolling connection with the upper end surface of the roller; two symmetrical hoops are arranged at the upper end of the fixing disc and used for fixing a welding gun. The hoop extends back to back to form a screw rod; a support plate is arranged on the upper end surface of the fixed disc; the screw rod is inserted into the support plate to realize rotary connection; a locking nut is in threaded connection with the screw rod and is used for locking and fixing the screw rod; a rotationally-connected suction cup is arranged at the lower end of the fixing disc and used for sucking the circular plate. And the welding gun is fixed on the fixed disc and is stable in position, so that the phenomenon of missing welding or excessive welding is avoided during welding.

Description

Technical Field

[0001] The invention relates to the technical field of welding machines, in particular to a cylindrical girth welding gun clamping device. Background Art

[0002] There is a cylinder, inside which a coaxial circular plate needs to be welded (refer to Fig.14 ). The welding process is that the tip of the welding gun is pressed against the joint between the circular plate and the cylinder, and the cylinder rotates one circle to complete the circumferential seam welding.

[0003] When the cylinder is long, it is difficult for a worker to reach the welding point when holding a welding gun and inserting it into the cylinder for welding. A conventional process to solve this difficulty is to first fix the welding gun on an extension rod, and then the worker holds the extension rod and inserts it into the cylinder for welding.

[0004] Because the extension rod is long, not only is the stability poor, but the field of vision is also poor, which causes the welding gun to shake and misalign easily during welding, resulting in welding leaks and excessive welding.

[0005] Therefore, how to overcome the above-mentioned defects has become a problem to be solved urgently by those skilled in the art. Summary of the invention

[0006] In order to solve the technical problems in the background technology, the present invention discloses a cylindrical girth welding gun clamping device.

[0007] The present invention provides a cylindrical girth welding gun clamping device, comprising a fixing plate, which is coaxial with a vertically arranged cylinder and inserted into the cylinder;

[0008] The outer wall of the fixed disk is clamped with a ball, which is rollingly connected with the inner wall of the cylinder;

[0009] The upper end of the fixed plate is connected to a circular limiting plate through a connecting rod, and the lower end surface of the limiting plate abuts against the upper end surface of the cylinder; the lower end surface of the limiting plate is also clamped with a ball, which is rollingly connected with the upper end surface of the drum;

[0010] The upper end of the fixing plate is provided with two symmetrically arranged clamps with openings facing each other, which are used to fix the welding gun;

[0011] A screw rod is extended to the back of the clamp, and a support plate is arranged on the upper end surface of the fixed plate; the screw rod is inserted into the support plate to realize the rotation connection;

[0012] The screw rod is also threadedly connected with a locking nut for locking and fixing the screw rod;

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

[0014] The welding process of the above-mentioned arrangement is: 1. Use a suction cup to absorb the circular plate and make the circular plate coaxial with the fixing ring; 2. Adjust the position of the clamp to fix the welding gun, and adjust the angle between the welding gun and the horizontal plane so that the welding end of the welding gun abuts against the edge of the circular plate; 3. The robot grabs the limiting ring and sends the welding gun into the cylinder until the limiting ring abuts against the upper end of the cylinder; 4. Start the welding gun and the mechanism that drives the cylinder to rotate at the same time, so that the cylinder rotates one circle; 5. The robot grabs the limiting ring and moves upward, and the suction cup is separated from the circular plate.

[0015] The beneficial effects of the above arrangement are: 1. The welding gun is fixed on the fixed disk and has a stable position, so there will be no leakage or excessive welding during welding; 2. When the cylinder rotates, since the fixed ring and the limit ring are rollingly connected to the cylinder, the fixed ring and the limit ring will not rotate under the grasping action of the manipulator, and will not cause wear to the cylinder; 3. The disc is fixed at the lower end of the fixed disk and is placed into the cylinder. It only needs to be fixed by the circumferential seam welding process. Compared with the method of first spot welding the disc and then performing circumferential seam welding, the process is simplified; 4. The position of the welding gun is adjusted first, and then the welding gun is inserted into the cylinder, which facilitates the adjustment of the position of the welding gun and improves the position accuracy of the welding gun.

[0016] The specific structure of the rotational connection between the suction cup and the fixed plate is: an axially arranged bearing seat is provided at the lower end of the fixed plate, and bearings are clamped at both ends of the bearing seat; the rotating shaft is inserted into the bearing; the upper end of the suction cup is inserted into the rotating shaft and is threadedly connected to the rotating shaft.

[0017] Since the suction cup grabs the circular plate, it is difficult to ensure that the circular plate and the fixed plate are in a coaxial position, and position deviation will occur, so it is difficult to insert the circular plate and the fixed plate into the cylinder. Based on this, further improvements are: an adjustment ring is provided at the lower end of the fixed plate; a concave platform is provided at the upper end of the adjustment 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 clamped with the concave platform. The setting of the rubber ring allows the bearing seat to float in its radial direction. When the circular plate is inserted into the cylinder and the fixed ring is difficult to insert into the cylinder due to position deviation, the radial position of the bearing seat can be adjusted to a position coaxial with the fixed ring, so that the fixed ring can stably enter the cylinder.

[0018] The adjustment ring is arranged as an integrated structure, which will make the installation of the bearing seat more difficult. Based on this, a further improvement is that the adjustment ring is composed of two symmetrically arranged ring petals.

[0019] It is difficult to adjust the welding gun to the welding position accurately and quickly by only adjusting the angle of the welding gun and the position of the clamp against the welding gun. The welding gun may even be too far from the edge of the round tube. No matter how it is adjusted, the welding gun cannot be adjusted to the welding position. Based on this, further improvements are as follows: a U-shaped slide with an opening facing outward is provided on the fixed plate; slots are provided on both sides of the slider to engage the side walls of the slide so that the slider can move; a support plate is provided at the upper end of the slider. The beneficial effects of such a setting are as follows: 1. The slider engages the side walls of the slide to guide the movement of the slider, so that there will be no position deviation when the welding gun is welding; 2. The setting of the slide allows the welding gun to be inserted into the slide when it is adjusted, thereby providing sufficient adjustment space for the welding gun and facilitating the adjustment of the welding gun.

[0020] In order to further improve the position stability of the slider and avoid relative sliding of the slider during welding, a further improvement is based on this: multiple positioning holes are set on both sides of the slide groove; the positioning pin passes through the slider and is inserted into the positioning hole to fix the slider.

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

[0022] Since the connecting rod is relatively long and flexible, the limit plate is prone to radial displacement, causing the ball on the limit plate to detach from the cylinder and friction to occur between the limit plate and the cylinder. Based on this, further improvements are made: the outer wall of the limit plate extends downward with multiple rotationally symmetrical limit blocks; the inner side of the limit block is clamped with a ball, which is rollingly connected to the outer wall of the cylinder.

[0023] Since the welding position of the circular plate will change, the insertion depth of the circular plate needs to be adjustable. Based on this, further improvements are made: the lower end of the connecting rod is fixedly connected to the fixed plate, the upper end is a threaded rod, and passes upward through the limit plate; the upper end of the limit plate is provided with an adjusting nut threadedly connected to the threaded rod; it is used to adjust the distance between the fixed plate and the limit plate.

[0024] The beneficial effects of the present invention are: 1. The welding gun is fixed on the fixed disk with a stable position, and there will be no leakage or excessive welding during welding; 2. When the cylinder rotates, since the fixed ring and the limit ring are rollingly connected to the cylinder, the fixed ring and the limit ring will not rotate under the grasping action of the manipulator, and will not cause wear to the cylinder; 3. The disc is fixed at the lower end of the fixed disk and is placed into the cylinder. It only needs to be fixed by the process of circumferential seam welding. Compared with the method of first spot welding the disc and then performing circumferential seam welding, the process is simplified; 4. The position of the welding gun is adjusted first, and then the welding gun is inserted into the cylinder, which is convenient for adjusting the position of the welding gun and improving the position accuracy of the welding gun. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0026] Figure 1 It is a schematic diagram of the structure of the present invention;

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

[0028] Figure 3 yes Figure 2 Sectional view of AA in the middle;

[0029] Figure 4 yes Figure 3 Enlarged view of point C in the middle;

[0030] Figure 5 yes Figure 3 The enlarged view of point D in the middle;

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

[0032] Figure 7 yes Figure 6 Enlarged view of K in the middle;

[0033] Figure 8 It is a structural schematic diagram of another viewing angle of the hidden cylinder of the present invention;

[0034] Fig. 9 yes Figure 8 Enlarged view of point E in the middle;

[0035] Fig.10 It is a front view of the hidden cylinder of the present invention;

[0036] Fig.11 yes Fig.10 Cross-sectional view of the middle FF;

[0037] Fig.12 yes Fig.11 Cross-sectional view of middle GG;

[0038] Fig.13 yes Fig.12 The enlarged view of the H in the middle;

[0039] Fig.14 It is a cross-sectional view of the connection structure between the cylinder and the circular plate;

[0040] Fig.15 yes Figure 4 The enlarged view of point B in the middle;

[0041] In the figure: 1. fixed plate; 2. cylinder; 3. ball bearing; 4. connecting rod; 5. limit plate; 6. clamp; 7. welding gun; 8. support plate; 9. locking nut; 10. suction cup; 11. round plate; 12. bearing seat; 13. adjusting ring; 14. rotating shaft; 15. recessed platform; 16. rubber ring; 17. retaining ring; 18. slide groove; 19. slider; 20. retaining groove; 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; 131. ring petal. DETAILED DESCRIPTION

[0042] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0043] like Figure 1-9 As shown, the present invention discloses a cylindrical girth welding gun clamping device, comprising a circular fixed plate 1, which is coaxial with a vertically arranged cylinder 2 and inserted into the cylinder 2. A ball 3 is clamped on the outer wall of the fixed plate 1 and is rollingly connected to the inner wall of the cylinder 2.

[0044] A U-shaped slide groove 18 with an opening facing outward is provided on the fixed plate 1 , and the slider 19 is in an I-shape, with slots 20 provided on both sides thereof, which are engaged with the slide groove 18 , so that the slider 19 can slide along the slide groove 18 in a directional manner.

[0045] The slider 19 is provided with weight-reducing holes along the moving direction, which is used to reduce the weight of the slider 19 and reduce the cost. Both ends of the slider 19 are provided with symmetrical support plates 8 extending in the vertical direction. The slider 19 is provided with two symmetrically arranged and oppositely opened clamps 6, which are used to clamp and fix the welding gun 7. The clamps 6 are connected and fixed by bolts and nuts.

[0046] The slide block 19 is provided with an avoidance groove which runs through the upper and lower sides and is in the same direction as the opening of the slide groove 18 . The welding gun 7 is inserted into the avoidance groove so that when the welding gun 7 adjusts the angle with the horizontal plane, there is enough adjustment space and no collision occurs with the slide block 19 .

[0047] The hoop 6 has a screw rod 61 extending backward, which is inserted into the support plate 8 to achieve a rotational connection, so that the angle between the welding gun 7 and the horizontal plane can be adjusted. The screw rod 61 is also threadedly connected with a locking nut 9, which is close to the outer side of the support plate 8 and is locked to fix the position of the welding gun 7.

[0048] Therefore, the welding gun 7 adjusts its horizontal position through the slider 19, adjusts its angle with the horizontal plane by rotating the clamp 6, and adjusts its height by clamping the welding gun 7 at different positions by the clamp 6, so that the welding end of the welding gun 7 can accurately rest 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 slide groove 18. The positioning holes 27 form two rows and are parallel to the groove wall of the slide groove 18. Figure 10-13 As shown, the lower end of the fixed disk 1 is provided with a guide cylinder 22; the upper end of the guide cylinder 22 abuts against the fixed disk 1, and the lower end 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 limit plate 24 is provided near the upper end of the positioning pin 21; the compression spring 28 is sleeved on the positioning pin 21, and its upper end abuts against the limit plate 24, and its lower end abuts against the guide plate 23. When the slider 19 adjusts the position, the positioning pin 21 is pulled downward to make the positioning pin 21 disengage 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 is automatically inserted into the positioning hole 27 under the action of the compression spring 28. Such a configuration not only simplifies the operation of moving the positioning pin 21 upward, but also prevents the positioning pin 21 from falling downward under the action of gravity and vibration.

[0050] like Figure 4 and Fig.15 As shown, the lower end of the fixed disk 1 is connected to a coaxially arranged adjustment ring 13, and the upper end of the adjustment ring 13 is provided with a concave platform 15; a flexible rubber ring 16 is clamped in the concave platform 15, and the outer wall of the rubber ring 16 abuts against the side wall of the concave platform 15, and a gap is provided 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 snap ring 17 extending radially outward, and the snap ring 17 is inserted into the rubber ring 16 and 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 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. 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 allows the bearing seat 12 to float in its radial direction. 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 adjustment ring 13 is composed of two symmetrically arranged ring petals 131. In this arrangement, one of the ring petals 131 is installed first, and then the rubber ring 16 and the bearing seat 12 are clamped into the ring petal, and then the other ring petal 131 is installed, so as to facilitate installation.

[0052] The upper end of the fixed plate 1 is connected to a circular limiting plate 5 through 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, which is rollingly connected to the upper end surface of the drum.

[0053] The lower end of the connecting rod 4 is fixed to the fixed plate 1. Specifically, the lower end of the connecting rod 4 is provided with an external thread and is threadedly connected with two connecting nuts, which respectively abut against the upper and lower side surfaces of the fixed plate 1 and are locked to achieve the fixing of the lower end of the connecting rod 4.

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

[0055] Since the connecting rod 4 is relatively long and flexible, the limit plate 5 is prone to radial displacement, causing the ball 3 on the limit plate 5 to separate from the cylinder 2, and friction is generated between the limit plate 5 and the cylinder 2. Therefore, a plurality of rotationally symmetrical limit blocks 25 are extended downward from the outer wall of the limit plate 5; the ball 3 is clamped on the inner side of the limit block 25 and is rollingly connected to the outer wall of the cylinder 2.

[0056] The welding process set up above is: 1. Use the suction cup 10 to absorb the circular plate 11, and make the circular plate 11 coaxial with the fixing ring; 2. Adjust the clamp 6 to fix the position of the welding gun 7, and adjust the angle between the welding gun 7 and the horizontal plane so that the welding end of the welding gun 7 abuts against the edge of the circular plate 11; 3. The robot grabs the limiting ring and sends the welding gun 7 into the cylinder 2 until the limiting ring abuts against the upper end of the cylinder 2; 4. Start the welding gun 7 and the mechanism that drives the cylinder 2 to rotate at the same time, so that the cylinder 2 rotates one circle; 5. The robot 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: 1. The welding gun 7 is fixed on the fixed disk 1, and the position is stable, and there will be no leakage or excessive welding during welding; 2. When the cylinder 2 rotates, since the fixed ring and the limit ring are rollingly connected to the cylinder 2, the fixed ring and the limit ring will not rotate under the grasping action of the manipulator, and will not cause wear to the cylinder 2; 3. The disc is fixed at the lower end of the fixed disk 1 and is placed into the cylinder 2. It only needs to be fixed by the process of girth welding. Compared with the method of first spot welding the disc and then performing girth welding, the process is simplified; 4. The position of the welding gun 7 is adjusted first, and then the welding gun 7 is inserted into the cylinder 2, which is convenient for adjusting the position of the welding gun 7 and improving the position accuracy of the welding gun 7.

[0058] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of 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 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); The hoop (6) has a screw rod (61) extending in the back direction, and the upper end surface of the fixed plate (1) is provided with a support plate (8); 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).

2. The cylindrical girth welding torch clamping device according to claim 1 is characterized in that: an axially arranged bearing seat (12) is provided at the lower end of the fixed plate (1), 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 bearing (14) and is threadedly connected to the rotating shaft (14).

3. The cylindrical girth welding gun clamping device according to claim 2, characterized in that: an adjustment ring (13) is provided at the lower end of the fixing 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 outwards. The snap ring (17) is inserted into the rubber ring (16) and snap-fitted with the concave platform (15).

4. The cylindrical annular seam welding gun clamping device according to claim 3 is characterized in that the adjustment ring (13) is composed of two symmetrically arranged ring petals (131) spliced ​​together.

5. The cylindrical girth welding torch clamping device according to claim 1, characterized in that: the fixing plate (1) is provided with a U-shaped slide groove (18) opening outward; The two sides of the slider (19) are provided with clamping grooves (20) 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 sliding block (19).

6. The cylindrical girth welding torch clamping device according to claim 5, characterized in that: 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).

7. The cylindrical girth welding gun clamping device according to claim 6, characterized in that: a guide cylinder (22) is provided at the lower end of the fixing 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).

8. The cylindrical girth welding gun clamping device according to claim 1, characterized in that: the outer wall of the limit plate (5) extends downwardly with a plurality of rotationally symmetrical limit blocks (25); A ball (3) is clamped on the inner side of the limit block (25) and is rollingly connected to the outer wall of the cylinder (2).

9. The cylindrical girth welding gun clamping device according to claim 1 is characterized in that: the lower end of the connecting rod (4) is fixedly connected to the fixed plate (1), and the upper end is a threaded rod and 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 adjusting nut is used to adjust the distance between the fixing plate (1) and the limiting plate (5).

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