Clamping device for welding thin-wall nickel base pipe

Abstract

The utility model discloses a clamping device for welding a thin-wall nickel base tube, which comprises a supporting tube, a clamping device, a driving device, a clamping device, a clamping device and a clamping device, and is characterized in that the supporting tube rotates under the driving of the driving device and is parallel to the thin-wall nickel base tube; the multiple sets of clamping pieces are arranged at intervals in the length direction of the supporting pipe; any clamping piece comprises a first supporting plate, a second supporting plate and a third supporting plate. The first supporting plate is fixed to the supporting pipe. The fixed end of the pushing device is fixed on the first supporting plate; the pushing end of the pushing device is connected with the pressing block, and the thin-wall nickel base pipe is located between the first supporting plate and the pressing block. By means of the collaborative design of the multiple sets of clamping pieces and the supporting pipe, uniform stress of the thin-wall nickel base pipe is achieved, plastic deformation caused by local stress concentration is avoided, and the welding seam position precision and the fusion depth stability are guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of machining clamping technology. More specifically, this utility model relates to a clamping device for welding thin-walled nickel-based tubes. Background Technology

[0002] In concentrated solar power (CSP) systems, the manufacturing of tower-type molten salt receivers involves connecting thin-walled nickel-based tubes to stainless steel headers. The structural characteristics of this equipment differ significantly from conventional boiler products, with the core challenge lying in controlling the welding and clamping process of the thin-walled nickel-based tubes. Nickel-based materials possess high melting points, low thermal conductivity, and are prone to oxidation; localized high temperatures during welding can easily lead to oxidation and discoloration. Furthermore, the nickel-based tubes, with a wall thickness of only 1-2 mm, have weak heat dissipation capacity, further exacerbating the risk of thermal deformation.

[0003] In existing technologies, the welding of thin-walled nickel-based tubes and nickel-based cover plates relies entirely on manual TIG welding. While this manual method can achieve welding to a certain extent, the clamping process has the following fundamental drawbacks:

[0004] Manual welding requires manual adjustment of mechanical clamps for clamping, and the clamping force depends on the welder's experience. Thin-walled nickel-based tubes are prone to plastic deformation due to localized stress concentration during clamping, leading to weld misalignment or insufficient penetration.

[0005] Before welding, the workpiece position needs to be manually measured and adjusted, which results in a large positioning error. For long thin-walled pipe arrays, the cumulative positioning error has a 35% probability of causing the weld misalignment to exceed 0.5mm, which seriously affects the weld strength.

[0006] When welding manually, welders need to observe the state of the molten pool with the naked eye and manually adjust the angle of the welding torch. It is difficult for welders to simultaneously take into account the clamping accuracy, welding parameters and observation of the molten pool.

[0007] The clamping time for a single set of thin-walled tubes is relatively long, and multiple fine adjustments are required.

[0008] Therefore, there is an urgent need for an automated clamping device that can achieve uniform clamping, flexibly adjust the workpiece rotation angle, and have a short clamping time, in order to solve the clamping problem in the welding of thin-walled nickel-based tubes. Utility Model Content

[0009] The purpose of this invention is to provide a clamping device for welding thin-walled nickel-based tubes. Through the coordinated design of multiple clamping components and a support tube, uniform force is applied to the thin-walled nickel-based tube, avoiding plastic deformation caused by localized stress concentration and ensuring weld position accuracy and penetration stability. Utilizing a dual positioning structure of the support tube and clamping components, combined with precise rotation control of the shaft positioner, the workpiece positioning error is controlled within ±0.1mm, significantly reducing weld misalignment. Through the linkage between the electrical control system and the welding robot, the clamping force, rotation angle, and welding parameters are synchronously adjusted, thereby improving the weld penetration qualification rate. The modular design of the clamping components reduces the clamping time for a single assembly to less than 3 minutes, meeting the needs of large-scale production and reducing labor costs by more than 40%.

[0010] To achieve these objectives and other advantages of this invention, a clamping device for welding thin-walled nickel-based tubes is provided, comprising:

[0011] The support tube rotates under the drive of the drive device, and the support tube is parallel to the thin-walled nickel-based tube;

[0012] Multiple sets of clamping elements are spaced apart along the length of the support tube;

[0013] Any clamping element includes:

[0014] The first support plate is fixed to the support tube;

[0015] The pushing device has its fixed end fixed to the first support plate;

[0016] The clamping block is connected to the pushing end of the pushing device, and the thin-walled nickel-based tube is located between the first support plate and the clamping block.

[0017] Preferably, in the clamping device for welding thin-walled nickel-based tubes, the support tube rotates under the drive of the shaft positioner.

[0018] Preferably, in the clamping device for welding thin-walled nickel-based tubes, the pushing device is a cylinder;

[0019] Any clamping element also includes:

[0020] A connecting rod is parallel to the first support plate. One end of the connecting rod is connected to the pushing end of the pushing device, and the other end is connected to the clamping block.

[0021] Preferably, in the clamping device for welding thin-walled nickel-based tubes, any clamping element further includes:

[0022] The first fixing plate is disposed on the side of the first support plate facing the thin-walled nickel-based tube and is perpendicular to the first support plate. It is provided with an arc-shaped first recess that matches the outer diameter of the thin-walled nickel-based tube. The thin-walled nickel-based tube is located in the first recess and between the clamping block and the fixing plate.

[0023] The second fixing plate is disposed on the side of the first support plate opposite to the thin-walled nickel-based tube and perpendicular to the first support plate. It has an arc-shaped second recess that matches the outer diameter of the support tube, and the support tube is located in the second recess.

[0024] Preferably, in the clamping device for welding thin-walled nickel-based tubes, any clamping element further includes:

[0025] A pair of first fixing members, a first support plate is fixed to a support tube by the pair of first fixing members, the first fixing members are U-shaped, the support tube passes through the pair of first fixing members and fits with the curved part of the pair of first fixing members, the two ends of the first fixing members pass through the first support plate respectively and are fixedly connected to the first support plate, and a second fixing plate is located between the pair of first fixing members.

[0026] Preferably, the clamping device for welding thin-walled nickel-based tubes further includes:

[0027] Multiple sets of support components are spaced apart along the length of the support tube;

[0028] Any support member includes:

[0029] The second support plate is fixed to the support tube;

[0030] The third fixing plate is set on the side of the second support plate facing the thin-walled nickel-based tube and is perpendicular to the second support plate. It has an arc-shaped third recess that matches the outer diameter of the thin-walled nickel-based tube, and the thin-walled nickel-based tube is located in the third recess.

[0031] The fourth fixing plate is set on the side of the second support plate away from the thin-walled nickel-based tube and perpendicular to the second support plate. It has an arc-shaped fourth recess that matches the outer diameter of the support tube, and the support tube is located in the fourth recess.

[0032] A pair of second fasteners, the second support plate is fixed to the support tube by the pair of second fasteners, the second fasteners are U-shaped, the support tube passes through the pair of second fasteners and fits with the curved part of the pair of second fasteners, the two ends of the second fasteners pass through the second support plate respectively and are fixedly connected to the second support plate, and the fourth fastener is located between the pair of second fasteners.

[0033] Preferably, in the clamping device for welding thin-walled nickel-based tubes, the support members and clamping members are arranged alternately, and a set of support members is close to and corresponds to a set of clamping members. Each target point of the thin-walled nickel-based tube to be welded is located between each set of support members and the set of clamping members corresponding to it.

[0034] Preferably, the clamping device for welding thin-walled nickel-based tubes further includes:

[0035] Multiple support legs are spaced apart and vertically arranged below the support tube, and the support tube is rotatably connected to the top of each support leg.

[0036] This utility model has at least the following beneficial effects:

[0037] This utility model features multiple sets of clamping components spaced along the support tube, which can evenly distribute the clamping force, ensuring that the thin-walled nickel-based tube is uniformly stressed. This effectively avoids plastic deformation caused by local stress concentration, controlling the deformation within 0.1mm and guaranteeing the integrity and dimensional accuracy of the tube during the welding process.

[0038] This utility model features a dual positioning structure for the support tube and clamping component, combined with precise rotation control of the shaft positioner, which can control the workpiece positioning error within ±0.1mm. Simultaneously, the arc-shaped recesses of the first and third fixing plates match the outer diameter of the thin-walled nickel-based tube, ensuring that the weld misalignment is ≤0.2mm, significantly improving welding positioning accuracy and thus enhancing welding quality.

[0039] This invention uses an electronic control system linked with a welding robot to synchronously adjust clamping force, rotation angle, and welding parameters, thereby improving the weld penetration qualification rate. Furthermore, the staggered arrangement of support and clamping components disperses welding thermal stress and reduces thermal deformation; the thermal deformation of thin-walled nickel-based tubes can be reduced by more than 40%, ensuring the quality and stability of the weld.

[0040] This utility model features a modularly designed clamping component that, combined with automated control, significantly reduces the clamping time for a single assembly to less than 3 minutes. The shaft positioner and welding robot work together to automate the entire process of clamping, rotation, and welding. Compared to traditional manual welding, this greatly improves production efficiency and meets the demands of large-scale production.

[0041] This new automated clamping device reduces reliance on manual operation, lowering labor costs by over 40%. Simultaneously, it reduces manual adjustment and measurement steps, minimizing errors caused by manual operation and improving product quality consistency.

[0042] The first and second fixing parts of the U-shaped structure of this utility model rigidly fix the first and second support plates to the support tube, respectively, thereby increasing the connection stiffness by more than 50%, limiting the radial displacement of the first and second support plates, reducing the radial runout when the support tube rotates, and ensuring that the radial runout during rotation is ≤0.05mm, thus guaranteeing the stability of the device during the welding process.

[0043] The clamping device of this invention is suitable for nickel-based tubes with a wall thickness of 1-3mm. During the welding process, pure argon gas can be introduced into the thin-walled nickel-based tube to prevent oxidation and discoloration. The TIG self-fusion welding process with low heat input reduces thermal deformation and has good adaptability to different welding processes and materials.

[0044] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the welding device;

[0046] Figure 2 This is a structural schematic diagram of a clamping member, a supporting member, and a supporting leg according to an embodiment of the present utility model;

[0047] The reference numerals in the attached drawings are as follows: welding device-1; clamping device-11; support tube-111; clamping element-112; first support plate-1121; pushing device-1122; pressing block-1123; connecting rod-1124; first fixing plate-1125; second fixing plate-1126; first fixing element-1127; support element-113; second support plate-1131; third fixing plate-1132; fourth fixing plate-1133; second fixing element-1134; support leg-114; welding robot-12; thin-walled nickel-based tube-13. Detailed Implementation

[0048] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0049] It should be noted that in the description of this utility model, the terms "horizontal", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" 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 utility model 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 utility model.

[0050] like Figure 1 and 2 As shown, this utility model provides a clamping device for welding thin-walled nickel-based tubes, which is a welding device 1 (such as...). Figure 1 As shown in the figure, the clamping device 11 includes:

[0051] The support tube 111, driven by the drive device, rotates parallel to the thin-walled nickel-based tube 13. The support tube 111 is a rigid tube and provides support and a base for rotation of the thin-walled nickel-based tube 13, ensuring the positional stability and adjustability of the tube during welding. By arranging the support tube 111 and the thin-walled nickel-based tube 13 in parallel, the axial consistency of the tube 13 during rotation is ensured, preventing weld misalignment due to unstable support. The drive device rotates the support tube 111, enabling all-position welding of the thin-walled nickel-based tube 13 and reducing the need for manual adjustments.

[0052] Multiple sets of clamping elements 112 are spaced apart along the length of the support tube 111 to evenly distribute the clamping force along the length of the support tube 111, preventing plastic deformation of the thin-walled nickel-based tube 13 due to localized stress concentration. Each set of clamping elements 112 can be adjusted independently to achieve multi-point uniform clamping of the thin-walled nickel-based tube 13, controlling the deformation to within 0.1 mm. The spaced arrangement can disperse welding thermal stress and reduce the risk of thermal deformation of the thin-walled nickel-based tube 13.

[0053] Each clamping element 112 includes:

[0054] The first support plate 1121 is fixed to the support tube 111; it serves as the basic fixing structure for the clamping member 112 and connects the support tube 111 to the pushing device 1122. The first support plate 1121 is rigidly fixed to the support tube 111, transmitting the rotational movement of the support tube 111 to the clamping member 112, ensuring synchronous rotation of the entire assembly. The first support plate 1121 provides the mounting reference for the pushing device 1122, ensuring that the direction of the clamping force is perpendicular to the axis of the thin-walled nickel-based tube 13.

[0055] The pushing device 1122, with its fixed end fixed to the first support plate 1121, provides an adjustable clamping force to drive the clamping block 1123 to achieve rapid clamping and release of the thin-walled nickel-based tube 13. The pushing device 1122 can be a cylinder.

[0056] The clamping block 1123 is connected to the pushing end of the pushing device 1122, and the thin-walled nickel-based tube 13 is located between the first support plate 1121 and the clamping block 1123. The clamping block 1123 acts directly on the surface of the thin-walled nickel-based tube 13, converting the driving force of the pushing device 1122 into a clamping force.

[0057] The method of using the clamping device for welding thin-walled nickel-based tubes is as follows:

[0058] Place the thin-walled nickel-based tube 13 parallel to one side of the support tube 111, and adjust the axis of the thin-walled nickel-based tube 13 to be parallel to the axis of the support tube 111.

[0059] According to the length of the thin-walled nickel-based tube 13 and the distribution of the weld seams, clamping elements 112 are installed at intervals along the support tube 111.

[0060] Start each pushing device 1122 to drive the clamping block 1123 of each clamping member 112 to move synchronously toward the thin-walled nickel-based tube 13 until it contacts the thin-walled nickel-based tube 13 and applies a preset clamping force.

[0061] The clamping state is monitored in real time by pressure sensors (a miniature pressure sensor, such as a strain gauge sensor, is installed between the cylinder piston rod and the connecting rod 1124 to directly measure the clamping force output by the pushing device 1122, or a thin-film pressure sensor, such as a Tycoson thin-film pressure sensor, is attached to the inside of the clamping block 1123 to monitor the contact pressure on the surface of the thin-walled nickel-based tube 13 in real time) and displacement sensors (a magnetostrictive displacement sensor, such as an MTS magnetostrictive displacement sensor, is installed on the cylinder body to measure the piston rod extension length and indirectly reflect the displacement of the clamping block 1123, or a laser displacement sensor, such as a Keyence LK-G series laser displacement sensor, is installed between the support tube 111 and the first support plate 1121 to monitor the radial displacement of the clamping member 112 as it rotates with the support tube 111) to ensure uniform force distribution at each clamping point. Alternatively, other existing methods can be used to install corresponding sensors between the pushing device 1122 and the clamping target.

[0062] The drive unit rotates the support tube 111, and the rotation angle is precisely controlled by the shaft positioner or encoder to adjust the weld position to the optimal welding posture.

[0063] The welding robot 12 is used to weld the thin-walled nickel-based tube 13. The support tube 111 rotates continuously at a low speed to ensure uniform weld formation.

[0064] After welding is completed, the pushing device 1122 drives the clamping block 1123 to retract, releasing the thin-walled nickel-based tube 13. The thin-walled nickel-based tube 13 can then be removed by reversing the support tube 111 or with manual assistance.

[0065] The clamping device for welding thin-walled nickel-based tubes provided in this solution utilizes multiple sets of clamping elements 112 working in tandem to avoid localized stress concentration, and is suitable for nickel-based tubes with wall thicknesses of 1-3mm. The support tube 111, in conjunction with the shaft positioner, achieves a positioning error ≤0.1mm, reducing weld misalignment by more than 70%. Linked with the welding robot 12, it automates the entire process of clamping, rotating, and welding, shortening the clamping time for a single weld.

[0066] In another embodiment, in the clamping device for welding thin-walled nickel-based tubes, the support tube 111 rotates under the drive of the shaft positioner.

[0067] In another embodiment, the clamping device for welding thin-walled nickel-based tubes is a cylinder.

[0068] Each clamping element 112 further includes:

[0069] The connecting rod 1124 is parallel to the first support plate 1121, ensuring that the movement direction of the clamping block 1123 is perpendicular to the axis of the thin-walled nickel-based tube 13. One end of the connecting rod 1124 is connected to the pushing end of the pushing device 1122, and the other end is connected to the clamping block 1123. The connecting rod 1124 connects the pushing device 1122 and the clamping block 1123, stably transmitting the driving force and preventing the clamping block 1123 from tilting.

[0070] In another embodiment, in the clamping device for welding thin-walled nickel-based tubes, any clamping element 112 further includes:

[0071] A first fixing plate 1125 is disposed on the first support plate 1121 facing the thin-walled nickel-based tube 13. The first fixing plate 1125 is perpendicular to the first support plate 1121. The first fixing plate 1125 has an arc-shaped first recess that matches the outer diameter of the thin-walled nickel-based tube 13. The thin-walled nickel-based tube 13 is located in the first recess and between the clamping block 1123 and the first fixing plate 1125. The arc-shaped first recess, matching the outer diameter of the thin-walled nickel-based tube 13, provides a pre-positioning function, reduces clamping time, and also prevents scratching of the thin-walled nickel-based tube 13. The arc-shaped first recess provides a pre-positioning function, reducing clamping time. Together with the clamping block 1123, it forms a three-point positioning system of "first support plate 1121 - first fixing plate 1125 - clamping block 1123," improving the stability of the thin-walled nickel-based tube 13. In use, the thin-walled nickel-based tube 13 is embedded in the first recess, and the pressing block 1123 is driven by the pushing device 1122 to clamp the thin-walled nickel-based tube 13 between the first fixing plate 1125 and the pressing block 1123.

[0072] The second fixing plate 1126 is disposed on the side of the first support plate 1121 opposite to the thin-walled nickel-based tube 13. The second fixing plate 1126 is perpendicular to the first support plate 1121. The second fixing plate 1126 has an arc-shaped second recess that matches the outer diameter of the support tube 111, and the support tube 111 is located in the second recess. The arc-shaped second recess matches the outer diameter of the support tube 111, enhancing the connection rigidity between the support tube 111 and the clamping member 112. It also reduces the radial runout of the support tube 111 during rotation and improves the welding positioning accuracy. In use, the support tube 111 is inserted into the second recess, and the second fixing plate 1126 is fixed to the first support plate 1121 by bolts or welding.

[0073] In another embodiment, in the clamping device for welding thin-walled nickel-based tubes, any clamping element 112 further includes:

[0074] A pair of first fixing members 1127 are used to fix a first support plate 1121 to a support tube 111. The first fixing members 1127 are U-shaped, and the support tube 111 passes through them, fitting against the curved portions of the first fixing members 1127. Both ends of the first fixing members 1127 pass through the first support plate 1121 and are bolted to it. A second fixing plate 1126 is located between the pair of first fixing members 1127. The pair of U-shaped first fixing members 1127 rigidly fix the first support plate 1121 to the support tube 111, preventing it from loosening during clamping. The first fixing members 1127 restrict the radial displacement of the first support plate 1121. After bolt tightening, the connection rigidity between the first support plate 1121 and the support tube 111 is increased by more than 50%. In use, a pair of first fixing members 1127 are fitted onto the support tube 111, and both ends are connected to the first support plate 1121 by bolts to ensure that the second fixing plate 1126 is located between the pair of first fixing members 1127.

[0075] In another embodiment, the clamping device for welding thin-walled nickel-based tubes further includes:

[0076] Multiple sets of support members 113 are spaced apart along the length of the support tube 111; the multiple sets of support members 113 provide additional support points along the length of the support tube 111, reducing the sagging or deformation of the thin-walled nickel-based tube 13 due to its own weight or thermal stress.

[0077] Any support member 113 includes:

[0078] The second support plate 1131 is fixed to the support tube 111; as the basic fixing structure of the support member 113, it connects the support tube 111 with the third fixing plate 1132 and the fourth fixing plate 1133. The second support plate 1131 is rigidly fixed to the support tube 111, transmitting the rotational movement of the support tube 111 to the support member 113, ensuring synchronous rotation of the whole. The second support plate 1131 provides the installation reference for the third fixing plate 1132 and the fourth fixing plate 1133, ensuring the geometric accuracy of the positioning structure.

[0079] The third fixing plate 1132 is disposed on the side of the second support plate 1131 facing the thin-walled nickel-based tube 13. The third fixing plate 1132 is perpendicular to the second support plate 1131. The third fixing plate 1132 has an arc-shaped third recess that matches the outer diameter of the thin-walled nickel-based tube 13. The arc-shaped third recess prevents scratching of the thin-walled nickel-based tube 13, and the thin-walled nickel-based tube 13 is located in the third recess. The third fixing plate 1132 is a positioning structure disposed on the second support plate 1131 to assist in supporting the thin-walled nickel-based tube 13. The arc-shaped third recess matches the outer diameter of the thin-walled nickel-based tube 13, providing a precise support point. The third fixing plate 1132 cooperates with the clamping member 112 to form a "support-clamping" double constraint, and the radial runout of the thin-walled nickel-based tube 13 is ≤0.05mm. In use, the thin-walled nickel-based tube 13 is embedded in the third recess, and the stability of the thin-walled nickel-based tube 13 is ensured by the constraint of the fourth fixing plate 1133 and the second fixing member 1134.

[0080] A fourth fixing plate 1133 is disposed on the side of the second support plate 1131 opposite to the thin-walled nickel-based tube 13. The fourth fixing plate 1133 is perpendicular to the second support plate 1131. The fourth fixing plate 1133 has an arc-shaped fourth recess that matches the outer diameter of the support tube 111, and the support tube 111 is located in the fourth recess. The fourth fixing plate 1133 is a positioning structure disposed on the other side of the second support plate 1131. The arc-shaped fourth recess matches the outer diameter of the support tube 111, enhancing the connection rigidity between the support tube 111 and the support member 113. It reduces the radial runout of the support tube 111 during rotation, improving the rotation accuracy to ±0.03°. In use, the support tube 111 is inserted into the fourth recess, and the fourth fixing plate 1133 is fastened to the second support plate 1131 by the second fixing member 1134.

[0081] A pair of second fixing members 1134 are used to fix the second support plate 1131 to the support tube 111. The second fixing members 1134 are U-shaped, and the support tube 111 passes through the pair of second fixing members 1134 and fits against the curved part of the pair of second fixing members 1134. The two ends of the second fixing members 1134 pass through the second support plate 1131 and are fixedly connected to the second support plate 1131 by bolts. A fourth fixing plate 1133 is located between the pair of second fixing members 1134. The pair of U-shaped second fixing members 1134 rigidly fix the second support plate 1131 to the support tube 111, preventing the second support from loosening during clamping. The second fixing members 1134 restrict the radial displacement of the second support plate 1131. After tightening with bolts, the connection stiffness between the second support plate 1131 and the support tube 111 is increased by more than 50%. In use, a pair of second fasteners 1134 are fitted onto the support tube 111, and both ends are connected to the second support plate 1131 by bolts to ensure that the fourth fixing plate 1133 is located between the pair of second fasteners 1134.

[0082] Structurally, the support member 113 mainly serves as a basic support structure, while the clamping member 112 expands upon the support member 113 by adding a cylinder, a connecting rod 1124, and a clamping block 1123. The cylinder serves as the power source, and the connecting rod 1124 acts as a transmission mechanism; the two work together to drive the clamping block 1123.

[0083] In terms of function, the support member 113 is mainly responsible for providing stable support for the thin-walled nickel-based tube 13, ensuring its basic position during clamping. The clamping member 112 has a more comprehensive function; it not only provides support but also uses a cylinder to push the connecting rod 1124, causing the clamping block 1123 to apply pressure to the thin-walled nickel-based tube 13, firmly fixing it in place. This clamping function is crucial, effectively preventing deformation and warping of the thin-walled nickel-based tube 13 during welding, avoiding inaccurate positioning caused by these issues, and thus providing a reliable guarantee for high-quality welding.

[0084] In another embodiment, the clamping device for welding thin-walled nickel-based tubes features staggered arrangement of support members 113 and clamping members 112, with one set of support members 113 close to and corresponding to one set of clamping members 112. Each target point of the thin-walled nickel-based tube 13 to be welded is located between each set of support members 113 and its corresponding set of clamping members 112. The staggered arrangement of support members 113 and clamping members 112 forms a dense support network, dispersing the localized stress generated by welding heat input and reducing thermal deformation. During use, support members 113 are installed at intervals on the support tube 111 according to the length of the thin-walled nickel-based tube 13 and the weld distribution, alternating with the clamping members 112.

[0085] The method of using the clamping device for welding thin-walled nickel-based tubes is as follows:

[0086] The support tube 111 is rigidly connected to the output shaft of the shaft positioner via a coupling to ensure that the axis of rotation is parallel to the axis of the thin-walled nickel-based tube 13.

[0087] Clamping members 112 and support members 113 are installed at intervals along the length of the support tube 111. The support members 113 and clamping members 112 are arranged alternately to ensure that the target point to be welded is located between the two.

[0088] The first support plate 1121 is fixed to the support tube 111 by a pair of U-shaped first fasteners 1127, and the support tube 111 is embedded in the second recess of the second fixing plate 1126.

[0089] The second support plate 1131 is fixed to the support tube 111 by a pair of U-shaped second fasteners 1134, and the support tube 111 is embedded in the fourth recess of the fourth fixing plate 1133.

[0090] The thin-walled nickel-based tube 13 is sequentially placed into the first recess of each clamping member 112 and the third recess of each support member 113 to ensure that the axis of the thin-walled nickel-based tube 13 is parallel to the axis of the support tube 111.

[0091] Manually adjust the position of the thin-walled nickel-based tube 13 so that the target point to be welded is located between the corresponding support 113 and the clamping member 112.

[0092] The pneumatic system is activated, and the connecting rod 1124 is driven by the cylinder to push the clamping block 1123, clamping the thin-walled nickel-based tube 13 between the first fixing plate 1125 and the clamping block 1123.

[0093] The cylinder pressure is adjusted by a pressure reducing valve to ensure uniform clamping force of each clamping component 112, and the pressure is monitored in real time by a pressure sensor.

[0094] Start the shaft positioner to rotate the support tube 111 to the target welding angle, and precisely control the rotation angle through the encoder.

[0095] The welding robot 12 works in conjunction with the target points to perform welding. The support pipe 111 rotates continuously at a low speed to ensure uniform weld formation.

[0096] During welding, pure argon gas is introduced into the thin-walled nickel-based tube 13 to prevent oxidation and discoloration; a low-heat-input TIG self-fusion welding process is adopted to reduce thermal deformation.

[0097] When the pneumatic system is shut down, the cylinder piston rod retracts, causing the clamping block 1123 to retract and releasing the clamping force.

[0098] By reversing the support tube 111 or with manual assistance, the thin-walled nickel-based tube 13 is removed from the first and third recesses.

[0099] The arc-shaped recesses of the first fixing plate 1125 and the third fixing plate 1132 in this design match the outer diameter of the thin-walled nickel-based tube 13, with a positioning error of ≤0.1mm, ensuring that the weld misalignment is ≤0.2mm. The support member 113 and the clamping member 112 are staggered to disperse the welding thermal stress, reducing the thermal deformation of the thin-walled nickel-based tube 13 by more than 40%. The shaft positioner and the welding robot 12 are linked to realize the full automation of clamping, rotation, and welding, reducing the clamping time of a single weld from 15 minutes to 3 minutes. The U-shaped first fixing member 1127 and the second fixing member 1134 enhance the connection rigidity between the first support plate 1121, the second support plate 1131 and the support tube 111, with radial runout of ≤0.05mm during rotation.

[0100] Through the above steps, this device achieves efficient and high-precision clamping and welding of thin-walled nickel-based tubes 13, breaking through the limitations of traditional manual welding and significantly improving product quality and production efficiency.

[0101] In another embodiment, the clamping device for welding thin-walled nickel-based tubes further includes:

[0102] Multiple support legs 114 are spaced apart and vertically arranged below the support tube 111, and the top of each support leg 114 is rotatably connected to the support tube 111.

[0103] The rotational support structure of support leg 114 and support tube 111 is described as follows:

[0104] 1. Structural Composition and Installation Method

[0105] Support leg 114: Multiple support legs 114 are arranged vertically at intervals, and a bearing seat is provided at the top for installing bearings.

[0106] Support tube 111: The support tube 111 is machined with a journal (the diameter is slightly smaller than the inner ring diameter of the bearing), and a deep groove ball bearing or cylindrical roller bearing is installed at the journal.

[0107] Bearing connection: The inner ring of the bearing on the support tube 111 is fixed to the journal by interference fit, and the outer ring of the bearing is embedded in the bearing seat at the top of the support leg 114, forming a rotating connection of "support tube 111-bearing-support leg 114".

[0108] 2. Working Principle

[0109] Support function: The outer ring of the bearing is fixed to the bearing seat at the top of the support leg 114, and the inner ring of the bearing rotates synchronously with the support tube 111. The support leg 114 bears the weight of the support tube 111 and the welded parts through the bearing seat and the bearing. The bearing rollers (or balls) roll between the inner and outer rings, converting sliding friction into rolling friction and reducing rotational resistance.

[0110] Rotation is achieved by the following: When the drive device (such as a shaft positioner) drives the support tube 111 to rotate, the inner ring of the bearing rotates with the support tube 111, and the outer ring of the bearing is fixed on the support leg 114. The smooth rotation of the support tube 111 is achieved by the rolling of the rollers.

[0111] During the welding process, the support tube 111 rotates smoothly on the bearing, and with the dynamic compensation function of the shaft positioner, the weld position is kept stable.

[0112] The rotating support structure of the support leg 114 and the support tube 111 achieves the dual functions of "support" and "rotation" through rolling bearings: the inner ring of the bearing is fixed to the support tube 111, and the outer ring is fixed to the support leg 114. The rollers roll between the inner and outer rings, bearing the load while allowing free rotation. In the manufacturing of solar thermal power generation equipment, this design provides a stable and low-resistance rotating support foundation for the high-precision welding of the thin-walled nickel-based tube 13.

[0113] In actual use, other implementation modes can also be adopted, as long as the support leg 114 can support the support tube 111 and allow the support tube 111 to rotate.

[0114] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A clamping device for thin-walled nickel-based pipe welding, characterized in that, The utility model relates to a nickel-based pipe welding device, comprising: a support pipe rotating under the drive of a driving device, the support pipe being parallel to the thin-walled nickel-based pipe; a plurality of clamping units arranged along the length direction of the support pipe; any clamping unit comprising: a first support plate fixed on the support pipe; a pushing device with a fixed end fixed on the first support plate; a pressing block connected to the pushing end of the pushing device, the thin-walled nickel-based pipe being located between the first support plate and the pressing block.

2. The thin-walled nickel-based pipe welding clamping device of claim 1, wherein, The support pipe rotates under the drive of the shaft positioner.

3. The thin-walled nickel-based pipe welding clamping device of claim 1, wherein, The pushing device is a pneumatic cylinder; any clamping unit further comprising: a connecting rod parallel to the first support plate, one end of the connecting rod being connected to the pushing end of the pushing device and the other end being connected to the pressing block.

4. The thin-walled nickel-based pipe welding clamping device of claim 3, wherein, any clamping unit further comprising: a first fixed plate arranged on the side of the first support plate facing the thin-walled nickel-based pipe and being perpendicular to the first support plate, the first fixed plate being provided with an arc-shaped first recess matching the outer diameter of the thin-walled nickel-based pipe, the thin-walled nickel-based pipe being located in the first recess and between the pressing block and the fixed plate; a second fixed plate arranged on the side of the first support plate away from the thin-walled nickel-based pipe and being perpendicular to the first support plate, the second fixed plate being provided with an arc-shaped second recess matching the outer diameter of the support pipe, the support pipe being located in the second recess.

5. The thin-walled nickel-based pipe welding clamping device of claim 4, wherein, any clamping unit further comprising: a pair of first fixing units, the first support plate being fixed on the support pipe through the pair of first fixing units, the first fixing units being U-shaped, the support pipe passing through the pair of first fixing units and being fitted with the arc-shaped portions of the pair of first fixing units, the two ends of the first fixing units respectively passing through the first support plate and being fixedly connected to the first support plate, the second fixed plate being located between the pair of first fixing units.

6. The thin-walled nickel-based pipe welding clamping device of claim 5, wherein, The utility model further comprises: a plurality of support units arranged along the length direction of the support pipe; any support unit comprising: a second support plate fixed on the support pipe; a third fixed plate arranged on the side of the second support plate facing the thin-walled nickel-based pipe and being perpendicular to the second support plate, the third fixed plate being provided with an arc-shaped third recess matching the outer diameter of the thin-walled nickel-based pipe, the thin-walled nickel-based pipe being located in the third recess; a fourth fixed plate arranged on the side of the second support plate away from the thin-walled nickel-based pipe and being perpendicular to the second support plate, the fourth fixed plate being provided with an arc-shaped fourth recess matching the outer diameter of the support pipe, the support pipe being located in the fourth recess; a pair of second fixing units, the second support plate being fixed on the support pipe through the pair of second fixing units, the second fixing units being U-shaped, the support pipe passing through the pair of second fixing units and being fitted with the arc-shaped portions of the pair of second fixing units, the two ends of the second fixing units respectively passing through the second support plate and being fixedly connected to the second support plate, the fourth fixed plate being located between the pair of second fixing units.

7. The thin-walled nickel-based pipe welding clamping device of claim 6, wherein, The support units and the clamping units are arranged alternately, and one group of support units is close to and corresponds to one group of clamping units, each target point of the thin-walled nickel-based pipe to be welded being located between each group of support units and the corresponding group of clamping units.

8. The thin-walled nickel-based pipe welding clamping device of claim 6, wherein, The utility model further comprises: a plurality of support legs arranged vertically and spaced apart below the support pipe, the support pipe being rotatably connected to the top of each support leg.

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