A flange welding deformation correction clamp

Abstract

This utility model discloses a flange welding deformation correction fixture, comprising: a fixture base, a fixture chassis fixedly connected to the top surface inside the fixture base, a stepped semi-cylinder fixedly connected to the top surface of the fixture chassis, a shim disc rotatably connected to the center of the top surface of the fixture chassis, a first hydraulic cylinder fixedly inserted through one end of the bottom side of the stepped semi-cylinder, a first telescopic column provided at the output end of the first hydraulic cylinder, a clamping arc block fixedly connected to the end face of the first telescopic column, a second hydraulic cylinder fixedly inserted through the top of one side of the fixture base, a second telescopic column provided at the output end of the second hydraulic cylinder, and a clamping arc block fixedly connected to the end face of the second telescopic column; in this utility model, through the tenon-and-mortise cooperation of the limiting circular block and the limiting circular groove, the fixed flange and pipe fitting can be rotated freely 360 degrees, allowing for adjustment or correction of the welding angle without disassembling the workpiece.

Description

Technical Field

[0001] This utility model relates to the field of clamping equipment technology, specifically a flange welding deformation correction clamp. Background Technology

[0002] Flange welding deformation correction fixtures are specialized tooling fixtures designed to solve deformation problems such as planar warping, radial offset, and angular deviation caused by thermal stress after flange welding. They apply controllable external force to the flange through a mechanical structure or by limiting the flange's reference position, correcting the deformed parts of the flange to a state that meets the design accuracy requirements. At the same time, they can help maintain the stability of the flange during the correction process and avoid secondary deformation. They are widely used in the post-weld processing of flanges in pipelines, pressure vessels, steel structures and other fields to ensure the sealing and connection accuracy of the flange in subsequent assembly.

[0003] Existing Chinese patent document CN219925058U discloses a flange welding fixture, including: a flange fixing fixture and a steel pipe fixing fixture, which are fixedly connected and coaxially arranged. The flange fixing fixture includes a fixing plate with a fixing groove on its upper surface. The size and shape of the fixing groove are adapted to the flange. The steel pipe fixing fixture includes a positioning shaft and a fixing assembly. One end of the positioning shaft is located on the bottom surface of the fixing groove and is perpendicular to the bottom surface of the fixing groove. The positioning shaft and the fixing groove are concentrically arranged. The fixing assembly is hinged to the positioning shaft. Multiple sets of fixing assemblies are arranged in a circular array on the surface of the positioning shaft. The fixing assembly can fix the inner wall of the steel pipe. By ensuring that the positioning shaft and the fixing groove are concentrically arranged, the flange and the steel pipe are coaxially arranged, ensuring that the center lines of the flange and the steel pipe are collinear during the welding process.

[0004] However, the flange welding fixture still has shortcomings: it lacks flexible angle adjustment function. In actual operation, if it is necessary to perform deformation correction or repair welding operation on different angles of the flange and steel pipe welding parts, it is necessary to move or rotate the whole equipment, or the operator must adjust his own angle according to the needs. This not only easily causes positional displacement during the process of moving the whole equipment, but also increases the workload of the operator, which is inconvenient.

[0005] Therefore, we propose a flange welding deformation correction fixture. Utility Model Content

[0006] The purpose of this utility model is to provide a flange welding deformation correction fixture to solve the problem mentioned in the background art that it lacks flexible angle adjustment function. In actual operation, if it is necessary to perform deformation correction or repair welding operation on different angles of the flange and steel pipe welding parts, it is necessary to move or rotate the entire equipment, or the operator must adjust their own angle according to the needs. This not only easily causes positional displacement during the process of moving the entire equipment, but also increases the workload of the operator, which is inconvenient.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a flange welding deformation correction fixture, comprising: a fixture base, a fixture chassis fixedly connected to the top surface inside the fixture base, a stepped semi-cylinder fixedly connected to the top surface of the fixture chassis, a raised disc rotatably connected to the center of the top surface of the fixture chassis, a first hydraulic cylinder fixedly inserted through one end of the bottom side of the stepped semi-cylinder, a first telescopic column provided at the output end of the first hydraulic cylinder, a clamping arc block fixedly connected to the end face of the first telescopic column, a second hydraulic cylinder fixedly inserted through the top of one side of the fixture base, a second telescopic column provided at the output end of the second hydraulic cylinder, and a clamping arc block fixedly connected to the end face of the second telescopic column.

[0008] As a further embodiment of this utility model: the clamp base is configured as an arc-shaped frame structure, and the clamp base plate and the stepped semi-cylinder are both located inside the clamp base. The stepped semi-cylinder is composed of two sets of semi-cylinder structures with different diameters, and the diameter of the top semi-cylinder is slightly smaller than that of the bottom semi-cylinder, so that the top clamps and accommodates the pipe fittings and the bottom clamps and accommodates the flanges.

[0009] As a further embodiment of this utility model: the clamping disc arc block is vertically fixed to four sets of fixing rods on the outer side, and a rotating sleeve is movably sleeved on the outer side of each fixing rod. The clamping tube arc block is provided with the same number and specifications of fixing rods and rotating sleeve structures as the clamping disc arc block. The first hydraulic cylinder, the first telescopic column, the clamping disc arc block, the clamping tube arc block and their internal connecting structures are each provided in two sets, symmetrically arranged on the same central vertical plane of the stepped semi-cylinder.

[0010] As a further improvement of this utility model: the clamp base is symmetrically fixed with support side frames on both sides to improve the stability of the connected structure; the bottom ends of both sides of the clamp base are symmetrically provided with structural grooves to accommodate the first hydraulic cylinder; and the top sides of the stepped semi-cylinder are symmetrically provided with clamping grooves for fixing the second hydraulic cylinder.

[0011] As a further embodiment of this utility model: the bottom surface of the raised disc is fixedly connected to a limiting block, and the center of the top surface of the clamping base is provided with a limiting groove structure that matches the specifications of the limiting block, so as to realize that the raised disc is rotatably connected to the clamping base.

[0012] As a further embodiment of this utility model: a base strip is fixedly connected to one end of the side of the raised disc, and an extension strip is slidably connected inside the base strip. The top surfaces of the base strip and the extension strip are set on the same horizontal plane. There are four sets of both the base strip and the extension strip, which are symmetrically arranged in four directions on the outside of the raised disc to support and place flange structures of different specifications. The top surface of the raised disc is provided with an anti-slip rubber pad structure.

[0013] As a further embodiment of this utility model: a positioning lug is fixedly connected to the end face of the extension strip, and a spring insert is movably inserted inside the positioning lug. The spring insert is composed of a rod with a spring sleeve on the outside. Several sets of insert ring grooves are concentrically opened on the top surface of the clamp base. The ring width of the insert ring groove is adapted to the diameter of the end of the spring insert, so that the spring insert can be flexibly adjusted to rotate in any set of insert ring grooves, which is convenient for adjusting the extension degree of the extension strip according to the actual flange specifications.

[0014] As a further embodiment of this utility model: an inner ring strip is fixedly connected to the center of the top surface of the raised disc, and abutment grooves are symmetrically opened at both ends of the inner ring strip. Spring abutment strips are inserted inside the abutment grooves. The spring abutment strip is composed of a set of springs and a set of abutment strips fixedly connected to each other. An anti-slip block is fixedly connected to the end of the spring abutment strip away from the spring structure. An adjustment handle is fixedly connected to the side of the abutment strip portion of the spring abutment strip. An adjustment groove structure with the same moving path as the adjustment handle is opened through the top surface of the inner side of the abutment groove.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. This utility model uses a retractable base strip and extension strip, and multiple sets of concentric insert ring grooves to quickly adjust the support radius to adapt to flanges of different diameters. Combined with the inner positioning structure of spring abutment strip and anti-slip abutment block, it can cover workpieces of various specifications. At the same time, the stepped semi-cylinder design ensures that the welding parts of the pipe fitting and the flange are always on the same correction reference plane. The symmetrically arranged hydraulic cylinder assembly can apply a balanced correction force, which solves the problems of poor adaptability of traditional clamps and correction deviation caused by misalignment of reference, and greatly improves the versatility and correction accuracy of the equipment.

[0017] 2. In this utility model, the tenon-and-mortise joint between the limiting circular block and the limiting circular groove allows the fixed flange and pipe fitting to rotate freely 360 degrees. The welding or correction angle can be adjusted without disassembling the workpiece. The rotating sleeve inside the clamping arc block and the clamping arc block can protect the workpiece surface and also achieve fine-tuning of the angle in conjunction with the rotation action. This avoids the cumbersome process of first correcting and disassembling the workpiece and then adjusting the welding angle, which is required by traditional equipment. It reduces the operation steps and workpiece disassembly and assembly time, and also reduces the risk of secondary deformation caused by repeated clamping. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the flange welding deformation correction fixture described in this utility model;

[0019] Figure 2 This is a schematic diagram of the fixture base in the flange welding deformation correction fixture described in this utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the clamping plate arc block in the flange welding deformation correction fixture described in this utility model;

[0021] Figure 4 This is a schematic diagram of the structure of the shim disc in the flange welding deformation correction fixture described in this utility model.

[0022] In the diagram: 1. Fixture base; 101. Support side frame; 102. Structural groove; 103. Second hydraulic cylinder; 104. Second telescopic column; 105. Pipe clamping arc block; 2. Fixture chassis; 201. Limiting circular groove; 202. Insertion ring groove; 3. Stepped semi-cylinder; 301. First hydraulic cylinder; 302. First telescopic column; 303. Clamping disc arc block; 304. Fixing rod; 305. Rotating sleeve; 306. Pipe clamping groove; 4. Elevating disc; 401. Limiting circular block; 402. Base strip; 403. Extension strip; 404. Positioning ear block; 405. Spring insert; 406. Inner ring strip; 407. Abutment groove; 408. Spring abutment strip; 409. Anti-slip abutment block; 410. Adjustment handle; 411. Adjustment groove. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0024] To facilitate understanding of this utility model, a more comprehensive description of this utility model will be provided below with reference to relevant embodiments, and several embodiments of this utility model will be given. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of this utility model more thorough and complete.

[0025] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0027] Example

[0028] like Figure 1-4 As shown, this utility model provides a technical solution: a flange welding deformation correction fixture, comprising: a fixture base 1, a fixture chassis 2 fixedly connected to the top surface inside the fixture base 1, a stepped semi-cylinder 3 fixedly connected to the top surface of the fixture chassis 2, a raised disc 4 rotatably connected to the center of the top surface of the fixture chassis 2, a first hydraulic cylinder 301 fixedly inserted through one end of the bottom side of the stepped semi-cylinder 3, a first telescopic column 302 provided at the output end of the first hydraulic cylinder 301, a clamping arc block 303 fixedly connected to the end face of the first telescopic column 302, a second hydraulic cylinder 103 fixedly inserted through one top side of the fixture base 1, a second telescopic column 104 provided at the output end of the second hydraulic cylinder 103, and a clamping arc block 105 fixedly connected to the end face of the second telescopic column 104.

[0029] like Figure 1 As shown, the clamp base 1 is set as an arch-shaped frame structure. The clamp base 2 and the stepped semi-cylinder 3 are both set inside the clamp base 1. The stepped semi-cylinder 3 is composed of two sets of semi-cylinder structures with different diameters. The diameter of the top semi-cylinder is slightly smaller than that of the bottom semi-cylinder so that the top clamps and accommodates the pipe fittings and the bottom clamps and accommodates the flanges.

[0030] The key innovation of the above scheme is the design of the diameter difference of the stepped semi-cylinder 3. The small-diameter semi-cylinder at the top can fit against the outer wall of the pipe fitting to achieve precise positioning, while the large-diameter semi-cylinder at the bottom matches the outer circumference of the flange, so that the welding parts of the pipe fitting and the flange are on the same correction reference plane, avoiding secondary deformation caused by misalignment of the clamping position. This stepped structure perfectly adapts to the overall correction needs before and after welding the flange and the pipe fitting.

[0031] like Figure 2-3As shown, four sets of fixing rods 304 are vertically fixed to the outer side of the clamping arc block 303. Rotating sleeves 305 are movably sleeved on the outer side of each fixing rod 304. The clamping tube arc block 105 has the same number and specifications of fixing rods 304 and rotating sleeves 305 as the clamping arc block 303. The first hydraulic cylinder 301, the first telescopic column 302, the clamping arc block 303, the clamping tube arc block 105 and their internal connecting structures are all provided in two sets, symmetrically arranged on the same central vertical plane of the stepped semi-cylinder 3.

[0032] The above scheme, which combines four sets of fixed rods 304 with rotating sleeves 305, reduces friction with the flange or pipe surface during clamping by rotating the sleeve, thus avoiding damage to the workpiece surface during the straightening process. It also works in conjunction with the subsequent rotating structure, allowing the pipe and flange to rotate flexibly after clamping, facilitating the adjustment of the welding angle. The two symmetrically arranged power components can apply balanced straightening force from both sides, ensuring uniform force on the flange and preventing excessive local deformation caused by excessive force on one side. This symmetrical synchronous design is the core of ensuring straightening accuracy, and is especially suitable for the flatness and concentricity straightening of annular flanges.

[0033] like Figure 1-2 As shown, the clamp base 1 has symmetrical support side frames 101 fixed to both sides to improve the stability of the connected structure. The bottom ends of both sides of the clamp base 1 are symmetrically provided with structural grooves 102 for accommodating the first hydraulic cylinder 103. The top sides of the stepped semi-cylinder 3 are symmetrically provided with clamping grooves 306 for fixing the second hydraulic cylinder 103.

[0034] By adopting the above solution: the support side frame 101 reduces the risk of shaking when the clamp is applied with corrective force by increasing the contact area between the base and the ground. In particular, it can significantly improve the overall stability when using the related structure of the second hydraulic cylinder 301. The setting of the structural groove 102 and the clamping groove 306 assists in the installation, fixing and stabilization of the hydraulic cylinder structure.

[0035] like Figure 3 As shown, a limiting block 401 is fixedly attached to the bottom surface of the raised disc 4, and a limiting groove 201 structure that matches the specifications of the limiting block 401 is provided at the center of the top surface of the clamping base 2, so as to realize that the raised disc 4 is rotatably connected to the clamping base 2.

[0036] The above scheme uses a tenon-and-mortise joint between the limiting circular block 401 and the limiting circular groove 201, which not only restricts the axial displacement of the shim disc 4, but also allows free rotation through the sliding of the circular contact surface. This design allows the flange placed on the shim disc 4 to rotate synchronously with it, making it easy to adjust the flange angle during the correction process. It also allows for accurate and convenient welding of connection parts at different angles without having to disassemble and reassemble the workpiece, greatly improving operational flexibility.

[0037] like Figure 4As shown, a base strip 402 is fixed to one end of the side of the raised disc 4. An extension strip 403 is slidably connected inside the base strip 402. The top surfaces of the base strip 402 and the extension strip 403 are set on the same horizontal plane. There are four sets of both the base strip 402 and the extension strip 403, which are symmetrically arranged in four directions on the outside of the raised disc 4 to support flange structures of different specifications. The top surface of the raised disc 4 is provided with an anti-slip rubber pad structure.

[0038] The above scheme is adopted: the four-way symmetrical base strip 402 and extension strip 403 form a telescopic support frame. By sliding the extension strip 403 within the base strip 402, the support radius can be adjusted to adapt to flanges of different diameters. The design of the same horizontal plane ensures the flatness of the flange placement and avoids additional deformation caused by the tilt of the support surface. The anti-slip rubber pad on the top surface increases friction to prevent the flange from sliding when under the force of correction, ensuring the stability of the workpiece position during the correction process.

[0039] like Figure 3-4 As shown, a positioning lug 404 is fixedly connected to the end face of the extension bar 403. A spring insert 405 is movably inserted inside the positioning lug 404. The spring insert 405 is composed of a rod with a spring sleeved on the outside. Several sets of insert ring grooves 202 are concentrically opened on the top surface of the clamp base 2. The ring width of the insert ring groove 202 is adapted to the end diameter of the spring insert 405 so that the spring insert 405 can be flexibly adjusted in any set of insert ring grooves 202, which is convenient for adjusting the extension degree of the extension bar 403 according to the actual flange specifications.

[0040] The above solution involves the spring insert 405 and multiple sets of concentric insert ring grooves 202 working together to form an adjustable positioning and locking structure. When the length of the extension bar 403 is adjusted, the spring insert 405 automatically engages with the corresponding insert ring groove 202 under the action of the spring force, achieving quick fixing of the extension bar. When adjustment is needed again, simply pull the insert outward to unlock it, making the operation convenient. The design of multiple sets of concentric ring grooves ensures that the support center of flanges of different diameters always coincides with the central axis of the fixture, avoiding correction deviations caused by support offset.

[0041] like Figure 4 As shown, an inner ring strip 406 is fixedly connected to the center of the top surface of the raised disc 4. The inner ring strip 406 has symmetrical grooves 407 at both ends. Spring abutments 408 are inserted inside each groove 407. Each spring abutment 408 is composed of a set of springs and a set of abutments fixedly connected to each other. An anti-slip block 409 is fixedly connected to the end of the spring abutment 408 away from the spring structure. An adjustment handle 410 is fixedly connected to the side of the abutment part of the spring abutment 408. An adjustment groove 411 structure is opened through the top surface of the inner side of the groove 407, which is consistent with the movement path of the adjustment handle 410.

[0042] The above solution is adopted: the spring abutment 408 pushes the anti-slip abutment 409 tightly against the inner ring of the flange through the pre-pressure of the spring, realizing the concentric positioning of the flange from the inside, forming a clamping and fixing effect with the outer support component, ensuring that the flange does not shift radially during the correction process. The cooperation between the adjusting handle 410 and the adjusting groove 411 allows the operator to manually adjust the position of the abutment, which can not only adapt to flanges with different inner diameters, but also increase the operating space by pulling the abutment when loading and unloading workpieces. The anti-slip abutment 409 is made of rubber or wear-resistant plastic, which not only ensures the positioning friction, but also avoids scratching the inner ring of the flange.

[0043] The working principle of this utility model is as follows: When using this flange welding deformation correction fixture, firstly, adjust the support structure of the shim disc 4 according to the specifications of the flange to be treated, pull the spring insert 405 in the positioning lug 404 at the end of the extension strip 403 outward to release its lock with the insert ring groove 202 on the fixture base plate 2, push the extension strip 403 to slide in the base strip 402 to the position that matches the flange diameter, release the spring insert 405 so that it automatically snaps into the corresponding insert ring groove 202 under the action of the spring force, and complete the support radius fixation. At the same time, by adjusting the handle 410 along the adjusting groove 411, pull the spring abutment 408 in the inner ring strip 406, place the flange on the anti-slip rubber pad on the top surface of the shim disc 4, release the adjusting handle 410, and the spring abutment 408 pushes the anti-slip block 409 to adhere to the inner ring of the flange under the action of the spring preload, and form an inner and outer clamping fixation effect with the outer base strip 402 and the extension strip 403 to ensure that the flange is concentric and the position is stable.

[0044] The pipe fitting to be welded to the flange is then placed on top of the stepped semi-cylinder 3. The second hydraulic cylinder 103 in the pipe clamping groove 306 at the top of one side of the clamp base 1 is activated. The second hydraulic cylinder 103 drives the second telescopic column 104 to push the pipe clamping arc block 105 toward the pipe fitting. The fixed rod 304 and the rotating sleeve 305 in the pipe clamping arc block 105 are in contact with the outer wall of the pipe fitting. The rotation of the sleeve reduces friction and achieves precise positioning of the pipe fitting. At the same time, the first hydraulic cylinder 301 in the bottom structural groove 102 of the stepped semi-cylinder 3 is activated. The first hydraulic cylinder 301 drives the first telescopic column 302 to push the clamping arc block 303 toward the outer periphery of the flange. The two sets of symmetrically arranged clamping arc blocks 303 and clamping arc blocks 105 apply balanced external forces from both sides to correct the deformation such as planar warping and radial offset that may occur after flange welding. During this period, the support side frames 101 on both sides of the clamp base 1 increase the grounding area to reduce the risk of clamp shaking during the correction process and ensure stable application of the correction force.

[0045] If it is necessary to adjust the flange welding or straighten the angle, the shim disc 4 can be rotated directly. The limiting block 401 on its bottom surface slides along the limiting groove 201 of the clamp base plate 2, achieving free rotation and driving the flange and pipe fitting to adjust the angle synchronously. The deformed parts or welding positions at different angles can be treated without reassembling the workpiece. During the straightening process, the stepped structure of the stepped semi-cylinder 3 with a small diameter at the top and a large diameter at the bottom always keeps the welding parts of the pipe fitting and flange on the same straightening reference plane, avoiding secondary deformation caused by clamping misalignment. The rotating sleeve 305 inside the clamping arc block 303 and the clamping arc block 105 rotates slightly with the workpiece when subjected to force, which not only protects the workpiece surface from being scratched, but also ensures that the straightening force is evenly transmitted to the deformed parts, ultimately achieving accurate straightening and stable fixing of flange welding deformation.

[0046] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A flange welding deformation correction fixture, comprising: A clamp base (1) is characterized in that a clamp base plate (2) is fixedly connected to the top surface inside the clamp base (1), a stepped semi-cylinder (3) is fixedly connected to the top surface of the clamp base plate (2), a raised disc (4) is rotatably connected to the center of the top surface of the clamp base plate (2), a first hydraulic cylinder (301) is fixedly inserted through one end of the bottom side of the stepped semi-cylinder (3), a first telescopic column (302) is provided at the output end of the first hydraulic cylinder (301), a clamping disc arc block (303) is fixedly connected to the end face of the first telescopic column (302), a second hydraulic cylinder (103) is fixedly inserted through the top of one side of the clamp base (1), a second telescopic column (104) is provided at the output end of the second hydraulic cylinder (103), and a clamping pipe arc block (105) is fixedly connected to the end face of the second telescopic column (104).

2. The flange welding deformation correction fixture according to claim 1, characterized in that, The clamp base (1) is configured as an arc-shaped frame structure. The clamp base (2) and the stepped semi-cylinder (3) are both located inside the clamp base (1). The stepped semi-cylinder (3) is composed of two sets of semi-cylinder structures with different diameters. The diameter of the top semi-cylinder is slightly smaller than that of the bottom semi-cylinder so that the top can clamp and accommodate the pipe fitting and the bottom can clamp and accommodate the flange.

3. A flange welding deformation correction fixture according to claim 1, characterized in that, The clamping arc block (303) is vertically fixed with four sets of fixing rods (304) on the outside. The fixing rods (304) are movably sleeved with rotating sleeves (305) on the outside. The clamping tube arc block (105) is provided with the same number and specifications of fixing rods (304) and rotating sleeves (305) as the clamping arc block (303). The first hydraulic cylinder (301), the first telescopic column (302), the clamping arc block (303), the clamping tube arc block (105) and their internal connecting structures are all provided in two sets, and are symmetrically arranged on the same central vertical plane of the stepped semi-cylinder (3).

4. A flange welding deformation correction fixture according to claim 1, characterized in that, The clamp base (1) is symmetrically fixed with support side frames (101) on both sides to improve the stability of the structure connected thereto. The bottom ends of both sides of the clamp base (1) are symmetrically provided with structural grooves (102) for accommodating the first hydraulic cylinder (301). The top sides of the stepped semi-cylinder (3) are symmetrically provided with clamping grooves (306) for fixing the second hydraulic cylinder (103).

5. A flange welding deformation correction fixture according to claim 1, characterized in that, The bottom surface of the raised disc (4) is fixed with a limiting block (401), and the top surface of the clamp base (2) is provided with a limiting groove (201) structure that matches the specifications of the limiting block (401) so as to realize that the raised disc (4) is rotatably connected to the clamp base (2).

6. A flange welding deformation correction fixture according to claim 1, characterized in that, A base strip (402) is fixed to one side of the raised disc (4). An extension strip (403) is slidably connected inside the base strip (402). The top surfaces of the base strip (402) and the extension strip (403) are set on the same horizontal plane. There are four sets of both the base strip (402) and the extension strip (403), which are symmetrically arranged in four directions on the outside of the raised disc (4) to support and place flange structures of different specifications. The top surface of the raised disc (4) is provided with an anti-slip rubber pad structure.

7. A flange welding deformation correction fixture according to claim 6, characterized in that, The end face of the extension bar (403) is fixedly connected to a positioning lug (404). A spring insert (405) is movably inserted inside the positioning lug (404). The spring insert (405) is composed of a rod with a spring sleeved on the outside. Several sets of insert ring grooves (202) are concentrically opened on the top surface of the clamp base (2). The ring width of the insert ring groove (202) is adapted to the end diameter of the spring insert (405) so that the spring insert (405) can be flexibly adjusted in any set of insert ring grooves (202) to facilitate the adjustment of the extension bar (403) extension degree according to the actual flange specifications.

8. A flange welding deformation correction fixture according to claim 1, characterized in that, An inner ring strip (406) is fixedly connected to the center of the top surface of the raised disc (4). The inner ring strip (406) has symmetrical grooves (407) at both ends. Spring abutments (408) are inserted inside each groove (407). Each spring abutment (408) is composed of a set of springs and a set of abutments fixedly connected to each other. An anti-slip block (409) is fixedly connected to the end of the spring abutment (408) away from the spring structure. An adjustment handle (410) is fixedly connected to the side of the abutment part of the spring abutment (408). An adjustment groove (411) structure with the same moving path as the adjustment handle (410) is opened through the top surface of the inner side of the groove (407).

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