A clamping device for facilitating welding of flanges

Abstract

The application discloses a clamping equipment convenient for flange welding, which comprises a supporting mechanism, a cover plate fixed above the supporting plate, a plurality of circumferentially arranged and lifting-adjusted supporting blocks on the supporting plate, a clamping mechanism, a plurality of circumferentially uniform and even tightening blocks on the supporting plate, each tightening block being hinged with the tightening shaft through a tightening rod, the tightening shaft moving up and down, the tightening blocks moving radially on the supporting plate to shrink inward and expand outward, a pressing mechanism, a plurality of groups of pressing rod assemblies circumferentially arranged on the top plate, each group of the pressing rod assemblies comprising a connecting rod, a pressing rod and an adjusting rod. The application has the advantages of simple and compact structure, realization of tightening and clamping of flanges with different inner diameters and heights, application to different welding angles, avoidance of movement and even separation of the flanges in the turning process.

Description

Technical Field

[0001] This invention relates to positioning technology, belonging to the field of welding processing, and specifically to a clamping device that facilitates flange welding. Background Technology

[0002] During the welding of large flanges, the flanges need to be installed on a support platform or welding auxiliary equipment, fixed by a clamping mechanism, and then the outer ring and the frustum on the disc body are welded together by welding equipment. Existing clamping equipment generally uses a three-jaw or four-jaw chuck, that is, a three-jaw wrench is manually inserted into the square hole at the end of the small bevel gear, and the screw drives the large bevel gear to rotate, and causes the jaws on the large bevel gear to move radially, thereby clamping and fixing the flange. The following problems exist with this manually driven screw method: 1. During the welding process, the flange will experience thermal expansion and contraction, resulting in corresponding changes in the inner and outer diameters of the flange. Traditional clamping cannot adjust the tension of the flange in a timely manner, affecting the welding quality; 2. The clamping fixture has a limited stroke, which limits the range of changes in the inner diameter and thickness / height of the flange being tightened, making it unsuitable for flanges with large outer diameters and thickness / height; 3. The welding position and angle of the flange need to be adjusted to match the welding points of the welding equipment. For example, when the flange is rotated 180° to flip and weld the lower end face, the fixture only tightens the radial position of the flange, resulting in the flange not being effectively supported during or after flipping, which may lead to flange movement or even detachment. Summary of the Invention

[0003] The purpose of this invention is to provide a clamping device that facilitates flange welding. It has a simple and compact structure and can not only tighten and clamp flanges with different inner diameters and heights, but also be suitable for different welding angles, thus avoiding the phenomenon of flanges moving or even falling off during the flipping process.

[0004] To achieve the above objectives, the present invention provides a clamping device for facilitating flange welding, comprising: Positioner; The support mechanism includes a support plate installed at the rotary output end of the positioner and a cover plate fixed above the support plate; the support plate has multiple circumferentially arranged and height-adjustable support blocks. The clamping mechanism has a tensioning shaft that rotates coaxially with the support plate and drives it to move up and down, and multiple tensioning blocks that are evenly distributed circumferentially on the support plate. Each tensioning block is arranged vertically and is hinged to the tensioning shaft through a tensioning rod, so that when the tensioning shaft moves up and down, the tensioning block moves radially on the support plate to retract inward and expand outward. The pressing mechanism, located on the cover plate, has a top plate that moves up and down via a pressing cylinder, and multiple sets of pressure rod assemblies arranged circumferentially on the top plate. Each set of pressure rod assemblies has a connecting rod, a pressing rod, and an adjusting rod. One end of the connecting rod is rotatably mounted on the top plate, and the other end is connected to one end of the lower pressure rod. The other end of the lower pressure rod extends radially outward, and the lower middle part is rotatably mounted on one end of the adjusting rod. The adjusting rod is movably arranged.

[0005] In a preferred embodiment, the pressing mechanism further has a support fixedly connected to the tensioning block; The support is provided with an opening slot for placing the adjusting rod; The adjusting rod has an L-shaped bent structure, and a strip groove is provided at the bending point. The fixed shaft is fixed on the support and passes through the strip groove, allowing the adjusting rod to move and rotate on the fixed shaft.

[0006] In a preferred embodiment, the support frame of the positioner is provided with a drive motor, a first gear connected to the output end of the drive motor, and a second gear meshing with the first gear; The second gear is rotatably mounted on the support frame via a slewing bearing, and the support mechanism is fixedly mounted on the second gear.

[0007] Furthermore, the lower end of the tensioning shaft is rotatably mounted on a fixed seat via a bearing; The lower end of the fixed base is connected to a guide rod that slides through the support frame, and the output end of the lifting cylinder is connected to the guide rod through a connecting plate.

[0008] Furthermore, it also includes a central tube that is coaxially located inside the tensioning shaft and has a hollow structure; The upper end of the central tube is rotatably mounted on the cover plate via a bearing, and the lower end extends to below the tensioning shaft. The power source for the downward-pressing cylinder is connected to a rotary joint and led out from inside the central tube.

[0009] Furthermore, the support mechanism also has a base plate fixed to the second gear; The support plate is mounted on the base plate. The lower end of the support block is equipped with a sliding rod that slides up and down through the support plate, and a screw rod that is rotatably connected to the support block at the upper end. The screw is threaded in the middle and mounted on the support plate.

[0010] In a preferred embodiment, the support plate is provided with multiple guide rails in the circumferential direction; Each guide rail is provided with an inverted T-slot, and the guide block at the lower end of the tensioning block is provided with a roller, which is matched and rolled within the T-slot.

[0011] Furthermore, the outer side of the tensioning block is an arc-shaped surface and is provided with an elastic wear-resistant strip.

[0012] Compared with the prior art, the clamping device for easy flange welding of the present invention moves downward driven by the tensioning shaft, and drives the tensioning block to move radially on the support plate through the tensioning rod, so that the tensioning block exerts tension on the flange, realizing radial tensioning of the flange, which is suitable for flanges with different inner diameters; in addition, the lifting cylinder is always in the oil supply state, so that the tensioning shaft can maintain downward pull, ensuring that the tensioning block is in the tensioned state, compensating for the inner diameter error of the flange caused by welding deformation, and the tensioning force / clamping force can be adjusted in real time to meet different welding conditions; The support block can be raised and lowered to allow the calibration flange to be placed horizontally and is suitable for flanges of different heights. The pressing mechanism is used to press down on the flange, so that the flange is effectively clamped and fixed in the vertical direction by the support block and the pressing mechanism, thus preventing the flange from moving or even falling off during the flipping process. The fixed shaft on the support passes through the strip groove on the adjusting rod, allowing the adjusting rod to move and rotate on the fixed shaft. When the tensioning block moves radially, the adjusting rod can adjust its angle and position through the strip groove to accommodate the movement of the tensioning block, ensuring the simultaneous operation of the clamping mechanism and the pressing structure. The drive motor on the positioner starts, and through the first gear, it drives the second gear, enabling the support plate to rotate 360° without affecting the normal operation of the clamping mechanism and the pressing mechanism, so as to be suitable for different welding angles. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention (ignoring flange assembly); Figure 3 This is a schematic diagram of the assembly of the positioner's rotating output end and the support mechanism in this invention; Figure 4 This is a schematic diagram of the assembly of the clamping mechanism and the pressing mechanism in this invention; Figure 5 This is a schematic diagram of the support mechanism in this invention; Figure 6 This is a schematic diagram of the clamping mechanism in this invention; Figure 7 This is a front view of the clamping mechanism and the pressing mechanism in this invention; Figure 8 This is a schematic diagram of the pressing mechanism in this invention; Figure 9 This is a partial schematic diagram of the pressing mechanism in this invention; Figure 10 This is a simplified diagram of the clamping mechanism and pressing mechanism in this invention; In the diagram: 10. Positioner; 11. Support frame; 12. Drive motor; 13. First gear; 14. Second gear. 20. Clamping mechanism; 21. Tensioning block; 22. Guide block; 23. Tensioning rod; 24. Tensioning shaft; 30. Pressing mechanism; 31. Top plate; 32. Pressing cylinder; 33. Connecting rod; 34. Pressing rod; 35. Support; 36. Adjusting rod; 37. Central tube; 38. Strip groove. 40. Support mechanism; 41. Base plate; 42. Support plate; 43. Support block; 44. Screw; 45. Guide rail; 46. Support column; 47. Cover plate. 51. Lifting cylinder; 52. Guide rod; 53. Fixed base; 60. Flange. Detailed Implementation

[0014] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] by Figure 4 In this context, the position closer to the tensioning shaft 24 axis is defined as the inner part, and the position farther away from the tensioning shaft 24 axis is defined as the outer part. like Figure 1 , Figure 2 , Figure 4 , Figures 6 to 8 As shown, the present invention provides a clamping device for facilitating flange welding, comprising: Positioner 10; The support mechanism 40 has a support plate 42 installed on the rotary output end of the positioner 10 and a cover plate 47 fixed above the support plate 42; the support plate 42 has a plurality of circumferentially arranged and height-adjustable support blocks 43. The clamping mechanism 20 has a tensioning shaft 24 that rotates coaxially with the support plate 42 and is driven to move up and down, and a plurality of tensioning blocks 21 that are evenly distributed circumferentially on the support plate 42. Each tensioning block 21 is arranged vertically and is hinged to the tensioning shaft 24 through a tensioning rod 23, so that when the tensioning shaft 24 moves up and down, the tensioning block 21 moves radially on the support plate 42 to retract inward and expand outward. The pressing mechanism 30 is located on the cover plate 47 and has a top plate 31 that moves up and down via a pressing cylinder 32, and multiple sets of pressing rod assemblies arranged circumferentially on the top plate 31. Each set of pressing rod assemblies has a connecting rod 33, a pressing rod 34, and an adjusting rod 36. One end of the connecting rod 33 is rotatably mounted on the top plate 31, and the other end is connected to one end of the pressure rod 34. The other end of the pressure rod 34 extends radially outward, and the lower middle end is rotatably mounted on one end of the adjusting rod 36. The adjusting rod 36 is movably arranged. Specifically, the positioner 10 is suitable for welding positioning in rotary operation and is matched with welding equipment. Through lifting, flipping and rotating, the output end of the positioner 10 can reach the required welding and assembly angle. It is mainly composed of existing structures such as a rotary mechanism and a flipping mechanism. It is explained that the output end of this positioner 10 can rotate 360° in the circumference. The support plate 42 is used to support the platform and is fixed to the rotating output end of the positioner 10. The support block 43 on it is used to support the flange 60. The height adjustment can not only be used to calibrate the horizontal placement of the flange 60, but also to accommodate flanges 60 of different heights. The cover plate 47 can be installed above the support plate 42 by multiple vertically arranged support columns 46. The clamping mechanism 20 is used to clamp and tighten the flange 60; the axis of the tensioning shaft 24 is coaxial with the rotation center and has multiple lugs on it. The tensioning shaft 24 rotates with the support plate 42 and moves up and down. For example, the tensioning shaft 24 and the support plate 42 are connected by a flat key to achieve circumferential limiting and axial movement; each tensioning block 21 is arranged vertically to ensure contact with the flange 60 and is suitable for flanges 60 of different heights. The tensioning block 21 can be hinged to the tensioning shaft 24 by multiple tensioning rods 23 arranged vertically and horizontally. That is, one end of the tensioning rod 23 is rotatably mounted on the lug and the other end is rotatably mounted on the tensioning block 21. It is noted that the tensioning rod 23 is arranged at an angle. The pressing mechanism 30 is used to press down on the flange 60, so that the flange 60 is supported in the vertical direction by the support block 43 and the pressing mechanism 30 presses down to achieve effective clamping and fixation, so as to prevent the flange 60 from moving or even falling off during the flipping process; the outer end of the pressing rod 34 has a slightly downward bending structure, which can ensure that the action is on the upper end of the flange 60 after rotation and pressing. Preferably, there are four tensioning blocks 21, each tensioning block 21 is connected to the tensioning shaft 24 through two tensioning rods 23; there are four support blocks 43, which are arranged at equal angles to the tensioning blocks 21; there are four sets of pressure rod assemblies, which are arranged corresponding to each tensioning block 21. When using this automatic clamping equipment for the first time, the height of the support block 43 should be adjusted according to the upper and lower height of the flange 60. The tensioning block 21 moves inward and the outer end of the pressure rod 34 is raised, so as not to affect the normal placement of the flange 60 on the clamping mechanism 20. The flange 60 is fitted onto the outside of the clamping mechanism 20 and supported by the support block 43. The tensioning shaft 24 is driven to move downward, and the vertical angle between the tensioning rod 23 and the tensioning shaft 24 increases, causing the tensioning block 21 to move radially on the support plate 42, so that the tensioning block 21 exerts a tensioning effect on the flange 60. The pressing cylinder 32 in the pressing mechanism 30 drives the top plate 31 to move upward, and drives the pressing rod 34 to rotate through the connecting rod 33. That is, the middle part of the pressing rod 34 rotates on the adjusting rod 36. When the inner end of the pressing rod 34 is raised upward, the outer end moves downward and acts on the upper end of the flange 60. The positioner 10 drives the support plate 42, the clamping mechanism 20, and the tensioning and pressing flange 60 to rotate and flip to meet different welding angles.

[0016] like Figures 7 to 10 As shown, in the preferred embodiment, the pressing mechanism 30 further has a support 35 fixedly connected to the tensioning block 21; The support 35 is provided with an opening slot for placing the adjusting rod 36; The adjusting rod 36 has an L-shaped bending structure and a strip groove 38 is provided at the bending point. The fixed shaft is fixed on the support 35 and passes through the strip groove 38, so that the adjusting rod 36 can move and rotate on the fixed shaft. Specifically, the slot on the support 35 can limit the adjustment rod 36, preventing it from rotating too far downwards during movement. Figure 9 As shown, the adjusting rod 36 is located in the open slot, and its clockwise rotation is restricted; The adjusting rod 36 has an L-shaped structure, and the fixed shaft on the support 35 can move within the strip groove 38. That is, the adjusting rod 36 moves and rotates relative to the support 35 within the strip groove 38. The purpose is that when the support 35 moves radially with the tensioning block 21, the adjusting rod 36 can be adjusted relative to the support 35 to compensate for the change in position and angle of the adjusting rod 36 caused by the movement of the tensioning block 21, and to prevent the pressing mechanism 30 from malfunctioning. When the clamping mechanism 20 is activated, the tensioning block 21 moves radially, and the adjusting rod 36 changes its angle and position through the strip groove 38; when the pressing mechanism 30 is activated, the top plate 31 moves up and down, and drives the pressing rod 34 to rotate through the connecting rod 33, with the connection point between the pressing rod 34 and the adjusting rod 36 as the rotation point, so as to ensure that the outer end of the pressing rod 34 can normally press down on the flange 60. In this embodiment, the adjusting rod 36 is adjusted in position and angle via the strip groove 38 to accommodate the movement of the tensioning block 21, which can ensure the simultaneous operation of the clamping mechanism 20 and the pressing structure. It is noted that when the radial movement distance of the tensioning block 21 is too large, some components in the pressing mechanism 30 can be replaced to ensure the normal start-up of the pressing mechanism 30.

[0017] like Figure 3 As shown, in the preferred embodiment, the support frame 11 of the positioner 10 is provided with a drive motor 12, a first gear 13 connected to the output end of the drive motor 12, and a second gear 14 meshing with the first gear 13. The second gear 14 rotates on the support frame 11 via a slewing bearing, and the support mechanism 40 is fixedly installed on the second gear 14. Specifically, the number of teeth on the second gear 14 is greater than the number of teeth on the first gear 13; When the drive motor 12 starts, it drives the second gear 14 to rotate on the support frame 11 through the first gear 13. The support mechanism 40 located on the second gear 14 rotates in the same way. The purpose of this rotation is to free up the position of the rotation center for the tensioning shaft 24 to be assembled. Furthermore, the lower end of the tensioning shaft 24 is rotatably mounted on the fixed seat 53 via a bearing; The lower end of the fixed base 53 is connected to a guide rod 52 that slides through the support frame 11, and the output end of the lifting cylinder 51 is connected to the guide rod 52 through a connecting plate; like Figures 6 to 8 As shown, the device further includes a central tube 37 that is coaxially located inside the tensioning shaft 24 and has a hollow structure; The upper end of the central tube 37 is rotatably mounted on the cover plate 47 via a bearing, and the lower end extends to below the tensioning shaft 24. The power source of the downward pressure cylinder 32 is connected to a rotary joint and led out from inside the central tube 37; Specifically, the support plate 42 located on the second gear 14 rotates, at which time the clamping mechanism 20 and the pressing mechanism 30 rotate together, that is, the tensioning shaft 24 rotates. The lower end of the tensioning shaft 24 is rotatably mounted on the fixed seat 53 through the bearing, ensuring that the tensioning shaft 24 rotates relative to the fixed seat 53. The lifting cylinder 51 is started, and the guide rod 52 is driven to move up and down through the connecting plate, so that the fixed seat 53 moves up and down. Therefore, the tensioning shaft 24 can move up and down independently while rotating. By keeping the lifting cylinder 51 in a constant oil supply state, the tensioning shaft 24 can maintain a downward pulling force, ensuring that the tensioning block 21 is in a tensioned state, compensating for the inner diameter error of the flange 60 caused by welding deformation, and the tensioning force / clamping force can be adjusted in real time to meet different welding conditions. The cover plate 47, which is fixed to the support plate 42, rotates, and the upper end of the central tube 37 is rotated and mounted on the cover plate 47 through the bearing. That is, the cover plate 47 and the central tube 37 rotate relative to each other, so that the power source of the downward pressing cylinder 32 is smoothly led out from the inside of the central tube 37 through the rotary joint.

[0018] like Figure 5 As shown, in the preferred embodiment, the support mechanism 40 also has a base plate 41 fixed to the second gear 14; The support plate 42 is mounted on the base plate 41. The lower end of the support block 43 is provided with a sliding rod that slides up and down through the support plate 42, and a screw 44 that is rotatably connected to the support block 43 at its upper end. The screw 44 is threaded in the middle and mounted on the support plate 42; Specifically, when the support block 43 is adjusted, the screw 44 is rotated. The upper end of the screw 44 is threaded onto the support plate 42, which is connected to the support block 43 and the middle part of the screw 44. This causes the screw 44 to drive the support block 43 to move up and down under the guidance of the slide rod, thereby adjusting the height of the support block 43. Alternatively, a pair of locking nuts are threaded onto the screw 44, with the pair of locking nuts located at the upper and lower ends of the support plate 42 respectively. The screw 44 can be raised or lowered by rotating the pair of locking nuts.

[0019] like Figure 5 , Figure 6 As shown, the support plate 42 is further provided with a plurality of guide rails 45 in the circumferential direction; Each guide rail 45 is provided with an inverted T-slot, and the guide block 22 at the lower end of the tensioning block 21 is provided with a roller, which is matched and rolled in the T-slot; Furthermore, the outer side of the tensioning block 21 is an arc-shaped surface and is provided with an elastic wear-resistant strip; Specifically, the tensioning block 21 moves radially on the support plate 42 by matching the guide block 22 with the inverted T-slot, and the guide block 22 is equipped with rollers, which replace the original sliding by rolling to effectively reduce moving friction. The outer side of the tensioning block 21 is arc-shaped and has wear-resistant strips, which can effectively fit against the inner wall of the flange 60 and prevent the flange 60 from being damaged during tensioning.

[0020] When using the clamping device for easy flange welding, the height of the support block 43 is first adjusted according to the height of the flange 60. The positioner 10 adjusts the support plate 42 to a low and horizontal position, and the flange 60 is fitted onto the outside of the clamping mechanism 20 and supported by the support block 43. When the lifting cylinder 51 is started, it drives the fixed seat 53 to move downward relative to the support plate 42 through the guide rod 52, so that the tensioning shaft 24 connected to the fixed seat 53 moves downward, and the vertical angle between the tensioning rod 23 and the tensioning shaft 24 increases, which drives the tensioning block 21 to move radially on the support plate 42, so that the tensioning block 21 exerts a tensioning effect on the flange 60. While the tensioning block 21 moves radially, the adjusting rod 36 adjusts the angle and position on the support 35 at the upper end of the tensioning block 21 through the strip groove 38; the pressing cylinder 32 in the pressing mechanism 30 drives the top plate 31 to move upward, and drives one end of the pressing rod 34 to rotate through the connecting rod 33. The middle part of the pressing rod 34 rotates and is located on the adjusting rod 36, so the other end / outer end of the pressing rod 34 presses down on the upper end face of the flange 60; The flange 60 is fixed in the vertical direction by the pressing mechanism 30 and the support block 43, and is tightened and clamped in the radial direction by the tensioning block 21; When the drive motor 12 on the positioner 10 starts, the first gear 13 drives the second gear 14, enabling the support plate 42 on the second gear 14 to rotate 360° without affecting the normal operation of the clamping mechanism 20 and the pressing mechanism 30, so as to be suitable for different welding angles.

[0021] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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.

Claims

1. A clamping device for facilitating flange welding, characterized in that, include: Positioner (10); The support mechanism (40) has a support plate (42) installed on the rotating output end of the positioner (10) and a cover plate (47) fixed above the support plate (42); the support plate (42) has multiple support blocks (43) arranged circumferentially and adjustable in height. The clamping mechanism (20) has a tensioning shaft (24) that rotates coaxially with the support plate (42) and drives it to move up and down, and a plurality of tensioning blocks (21) that are evenly distributed circumferentially on the support plate (42). Each tensioning block (21) is arranged vertically and is hinged to the tensioning shaft (24) through a tensioning rod (23), so that when the tensioning shaft (24) moves up and down, the tensioning block (21) moves radially on the support plate (42) to shrink inward and expand outward. The pressing mechanism (30) is located on the cover plate (47) and has a top plate (31) that moves up and down by a pressing cylinder (32) and multiple sets of pressure rod assemblies arranged circumferentially on the top plate (31). Each set of pressure rod assemblies has a connecting rod (33), a pressing rod (34), and an adjusting rod (36). One end of the connecting rod (33) is rotatably mounted on the top plate (31), and the other end is connected to one end of the pressure rod (34). The other end of the pressure rod (34) extends radially outward, and the lower middle part is rotatably mounted on one end of the adjusting rod (36). The adjusting rod (36) is movably arranged. The pressing mechanism (30) also has a support (35) fixed to the tensioning block (21); The support (35) is provided with an opening slot for placing the adjusting rod (36); The adjusting rod (36) has an L-shaped bending structure and a strip groove (38) is provided at the bending point. The fixed shaft is fixed on the support (35) and passes through the strip groove (38) so that the adjusting rod (36) can move and rotate on the fixed shaft. The positioner (10) has a drive motor (12), a first gear (13) connected to the output end of the drive motor (12), and a second gear (14) meshing with the first gear (13) on its support frame (11). The support mechanism (40) also has a base plate (41) fixed on the second gear (14). The support plate (42) is mounted on the base plate (41), and the lower end of the support block (43) is provided with a sliding rod that slides up and down through the support plate (42) and a screw (44) that is rotatably connected to the support block (43) at the upper end. The screw (44) is threaded in the middle and mounted on the support plate (42).

2. The clamping device for facilitating flange welding according to claim 1, characterized in that, The second gear (14) is rotatably mounted on the support frame (11) via a slewing bearing, and the support mechanism (40) is fixedly mounted on the second gear (14).

3. The clamping device for facilitating flange welding according to claim 2, characterized in that, The lower end of the tensioning shaft (24) is rotatably mounted on the fixed seat (53) via a bearing; The lower end of the fixed seat (53) is connected to a guide rod (52) that slides through the support frame (11), and the output end of the lifting cylinder (51) is connected to the guide rod (52) through a connecting plate.

4. The clamping device for facilitating flange welding according to claim 3, characterized in that, It also includes a central tube (37) that is coaxially located inside the tensioning shaft (24) and has a hollow structure; The upper end of the central tube (37) is rotatably mounted on the cover plate (47) via a bearing, and the lower end extends to the bottom of the tensioning shaft (24); The power source of the downward pressure cylinder (32) is connected to a rotary joint and led out from inside the central tube (37).

5. The clamping device for facilitating flange welding according to claim 1, characterized in that, The support plate (42) is provided with multiple guide rails (45) in the circumferential direction; Each guide rail (45) is provided with an inverted T-slot, and the guide block (22) at the lower end of the tensioning block (21) is provided with a roller and is matched to roll within the T-slot.

6. The clamping device for facilitating flange welding according to claim 5, characterized in that, The outer side of the tensioning block (21) is an arc-shaped surface and is provided with an elastic wear-resistant strip.

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