Precisely-positioned thin-wall refrigeration pipe deformation-free welding tool

Abstract

The invention relates to the technical field of welding, and discloses a precise positioning thin-wall refrigeration pipe deformation-free welding tool which comprises positioning plates, the bottom ends of the positioning plates are slidably connected with the top end of a workbench, the positioning plates are symmetrically distributed with the median line of the workbench as the center, and one end of one positioning plate is provided with an outer pressing piece for limiting the outer wall of a pipeline; an inner supporting piece for supporting the inner wall of the pipeline is arranged at the end, close to the outer pressing piece, of the other positioning plate. The inner supporting piece is provided with the supporting rings, the supporting rings are located on the two sides of a pipeline welding seam correspondingly, different-diameter parts of the reducer pipe can be supported correspondingly, the inner supporting piece adapts to refrigeration pipes with different pipe diameters, the universality of the inner supporting piece is improved, and the welding supporting requirements of the refrigeration pipes of various specifications can be met; the two supporting rings are arranged on the same circular shaft, the coaxiality of the two supporting rings is guaranteed, then it is guaranteed that the circle centers of the two parts of the reducer pipe are always coaxial, and the position precision of a pipeline can be maintained in the welding process.

Description

Technical Field

[0001] The present invention relates to the field of welding technology, and particularly to a non-deformation welding tooling for precision positioning of thin-walled refrigeration pipes. Background Art

[0002] In the field of refrigeration equipment manufacturing, circular pipes, as typical thin-walled refrigeration pipes, are widely used in evaporators and condensers of equipment such as air conditioners and refrigerators due to their light weight, good thermal conductivity, low cost, and easy processing and forming. In actual production and life, there will be situations where circular refrigeration pipes of different diameters need to be connected. It is necessary to first weld different-diameter pipes to corresponding reducing pipe fittings to achieve transition connection.

[0003] When welding thin-walled circular pipes, due to the relatively thin pipe wall, its ability to resist deformation is relatively weak, and it is prone to deformation during the welding process. During welding, a local area is affected by a high-temperature heat source, causing the metal in the weld and the nearby area to rapidly heat up to the melting state, while the area far from the weld remains at a relatively low temperature. This non-uniform temperature distribution will cause different degrees of thermal expansion and contraction of the metal. In thin-walled circular pipes, due to the relatively thin pipe wall, heat conduction is relatively fast, and heat is more likely to spread to the surrounding area, further exacerbating the non-uniformity of the temperature distribution; at the same time, the thermal stress generated during the welding process is also more likely to cause the deformation of the pipe due to the relatively small rigidity of the thin-walled pipe; in addition, improper selection of process parameters such as welding speed, welding current, and welding sequence will further deteriorate the deformation problem of thin-walled circular pipes during welding, seriously affecting the dimensional accuracy and appearance quality of the pipes, and even may lead to a decrease in the sealing performance of the pipes, affecting their normal use in projects such as refrigeration systems. Summary of the Invention

[0004] Technical Problem to be Solved

[0005] Aiming at the above-mentioned disadvantages of the prior art, the present invention provides a non-deformation welding tooling for precision positioning of thin-walled refrigeration pipes, which can effectively solve the problem in the prior art that when welding thin-walled circular pipes, due to the relatively thin pipe wall, its ability to resist deformation is relatively weak, and it is prone to deformation during the welding process.

[0006] To achieve the above object, the present invention is realized through the following technical solutions:

[0007] The present invention provides a non-deformation welding tooling for precision positioning of thin-walled refrigeration pipes, including:

[0008] A workbench;

[0009] Positioning plate, the bottom end of the positioning plate is slidably connected to the top end of the workbench, the positioning plates are symmetrically distributed with the center line of the workbench as the center, an outer pressing member for limiting the outer wall of the pipeline is arranged at one end of one of the positioning plates, and an inner supporting member for supporting the inner wall of the pipeline is arranged at one end of the other positioning plate close to the outer pressing member. The inner supporting member includes a limiting block rotatably connected to the middle of the outer pressing member. A round shaft is fixedly connected to the end of the limiting block away from the outer pressing member. A supporting ring is arranged on the outer surface of the round shaft. A frustum is slidably connected to the middle of the supporting ring. An arc-shaped block is arranged on the outer wall of the supporting ring. When the frustum moves in the middle of the supporting ring, the arc-shaped block moves outward along the outer wall of the supporting ring, and jointly limits the pipeline during the welding process with the outer pressing member;

[0010] Wherein, a ball for rolling friction with the inner wall of the pipeline is arranged on the outer wall of the arc-shaped block.

[0011] Further, a channel for restricting the sliding track of the frustum is opened on the outer surface of the round shaft. A circular channel is opened through the frustum along the structural axis. The outer surface of the frustum is designed in a frustum shape, and plane areas are symmetrically designed on the outer wall of the frustum, locally replacing the original continuous conical surface with a plane.

[0012] Further, a circular groove for facilitating the sliding of the frustum is opened in the middle of the supporting ring. Guide blocks are symmetrically arranged on the inner wall of the circular groove. The other end of the guide block is fixedly connected to a fixed rod, and the other end of the fixed rod is fixedly connected to the arc-shaped block.

[0013] Further, a groove is fixedly connected to one end of the arc-shaped block, and a convex block engaged with the groove is fixedly connected to the other end of the arc-shaped block.

[0014] Further, limiting rings are equidistantly fixed on the outer wall of the arc-shaped block. The top end of the limiting ring is designed to incline inward. The ball is located in the middle of the limiting ring, and a rubber layer in flexible contact with the ball is arranged at the bottom end of the ball.

[0015] Further, the outer pressing member includes a fixing frame fixedly connected to the middle of one end of the positioning plate. A motor for driving its rotation is arranged outside the fixing frame. A limiting groove is opened in the middle of the other end of the fixing frame. The limiting block is rotatably connected to the limiting groove. An outer frame is fixedly connected to the other end of the fixing frame.

[0016] Further, the outer pressing member further includes an inner frame closely attached to the outer wall of the pipeline. The outer wall of the inner frame is movably connected to the inner wall of the outer frame through a telescopic member. The other end of the outer frame is connected to another outer frame through a connecting plate arranged in a snap-fit manner.

[0017] The technical solution provided by the present invention has the following beneficial effects compared with the prior art:

[0018] The present invention is provided with a support ring, which is located on both sides of the pipeline weld seam respectively, and can support different diameter parts of the reducing pipe respectively, adapt to refrigeration pipes with different pipe diameters, improve the versatility of the internal support, and meet the welding support requirements of refrigeration pipes of various specifications; the two support rings are arranged on a circular shaft, ensuring the coaxiality of the two support rings, and further ensuring that the centers of the two parts of the reducing pipe are always coaxial. At the same time, due to the cooperation of the limiting block and the limiting groove, the central axes of the external pressing part and the internal support part are also kept coaxial, which is beneficial to maintaining the position accuracy of the pipeline during welding and providing guarantee for high-quality welding.

[0019] The present invention is provided with a support ring and an arc-shaped block. The support ring provides an overall support framework, and the arc-shaped block can adjust the support according to the change of the pipeline diameter through being movable and closely fitting with the inner wall of the pipeline. The combination of the two realizes the function of supporting and positioning the pipeline from the inside. The inner frame limits and clamps the pipeline from the outside. The two apply forces synchronously, realizing the all-round constraint of the pipeline, effectively preventing the pipeline from deforming due to uneven stress during welding, and ensuring the welding quality.

[0020] The present invention is provided with a frustum. The outer surface of the frustum is designed in a circular truncated cone shape, and plane areas are symmetrically designed on the outer wall of the frustum, locally replacing the original continuous conical surface with a plane. A circular groove for the frustum to slide is opened in the middle of the support ring. Guide blocks are symmetrically arranged on the inner wall of the circular groove. The other end of the guide block is fixedly connected with a fixed rod, and the other end of the fixed rod is fixedly connected with the arc-shaped block. One end of the arc-shaped block is fixedly connected with a groove, and the other end of the arc-shaped block is fixedly connected with a convex block that engages with the groove. As the diameter of the circle formed by the arc-shaped blocks changes, the grooves and convex blocks on its side can move accordingly and closely fit with the inner walls of pipes with different diameters, realizing the effective fixation of the inner walls of the pipes, improving the support stability of the arc-shaped blocks for the pipes, and preventing the pipes from shaking or displacing during welding.

[0021] The present invention is provided with balls. Micro balls are embedded in the contact surface between the arc-shaped block and the pipeline, changing the sliding friction between the inner wall of the pipeline and the arc-shaped block into rolling friction, reducing the frictional force, reducing the energy loss and component wear, improving the rotational flexibility, making the pipeline rotate more smoothly, and being beneficial to ensuring the welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1Schematic diagram of the overall structure of the embodiment of the present invention;

[0024] Figure 2 Schematic diagram of the pipeline positioning state structure of the embodiment of the present invention;

[0025] Figure 3 Schematic diagram of the external pressure member structure of the embodiment of the present invention;

[0026] Figure 4 Schematic diagram of the internal support member structure of the embodiment of the present invention;

[0027] Figure 5 For the embodiment of the present invention Figure 4 Schematic diagram of the partial enlargement at position A in the embodiment;

[0028] Figure 6 Schematic diagram of the state transformation of the internal support member of the embodiment of the present invention;

[0029] Figure 7 Schematic diagram of the fixed rod structure of the embodiment of the present invention.

[0030] The reference numerals in the figure respectively represent: 1, workbench; 2, positioning plate; 3, external pressure member; 31, outer frame; 32, inner frame; 33, connecting plate; 35, fixed frame; 36, limiting groove; 5, internal support member; 51, round shaft; 52, support ring; 521, round groove; 53, arc-shaped block; 531, fixed rod; 532, guide block; 533, groove; 534, convex block; 535, limiting ring; 536, ball; 54, frustum; 55, channel; 56, limiting block. Detailed implementation manners

[0031] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0032] The present invention will be further described below with reference to the embodiments.

[0033] Embodiment:

[0034] Please refer to Figures 1-7 , the present invention provides a technical solution for a precision positioning non-deformation welding tooling for thin-walled refrigeration pipes:

[0035] Refer to Figure 1 and Figure 2, the bottom end of the positioning plate 2 is slidably connected to the top end of the workbench 1, and the positioning plates 2 are symmetrically distributed with the midline of the workbench 1 as the center. One end of one positioning plate 2 is provided with an external pressing member 3 for limiting the outer wall of the pipeline, and one end of the other positioning plate 2 close to the external pressing member 3 is provided with an internal supporting member 5 for supporting the inner wall of the pipeline.

[0036] Reference Figure 3 , the external pressing member 3 includes a fixing frame 35 fixedly connected to the middle of one end of the positioning plate 2. A motor for driving its rotation is arranged outside the fixing frame 35. A limiting groove 36 is opened in the middle of the other end of the fixing frame 35, and the limiting groove 36 is rotatably connected to the limiting block 56. The other end of the fixing frame 35 is fixedly connected to an outer frame 31. The external pressing member 3 further includes an inner frame 32 closely attached to the outer wall of the pipeline. The outer wall of the inner frame 32 is movably connected to the inner wall of the outer frame 31 through a telescopic member. The other end of the outer frame 31 is connected to another outer frame 31 through a connecting plate 33 arranged in a snap-fit manner;

[0037] Reference Figure 4 , Figure 6 and Figure 7 , the internal supporting member 5 includes a limiting block 56 rotatably connected to the middle of the external pressing member 3. The limiting block 56 at one end of the round shaft 51 is rotatably connected to the limiting groove 36 of the external pressing member 3, and the other end of the round shaft 51 is fixedly connected to the positioning plate 2. This connection method enables the internal supporting member 5 not to rotate synchronously with the pipeline when the pipeline rotates, and can maintain a relatively stable position, always providing reliable support for the pipeline. At the same time, it is also convenient to cooperate with the external pressing member 3 to realize the internal and external synchronous limiting of the pipeline; the end of the limiting block 56 far from the external pressing member 3 is fixedly connected to a round shaft 51, and a support ring 52 is arranged on the outer surface of the round shaft 51. There are two support rings 52 in the present invention, and the support rings 52 are respectively located on both sides of the pipeline welding seam, and can respectively support different diameter parts of the reducing pipe, and can meet the welding support requirements of various specifications of refrigeration pipes, improving the versatility of the internal supporting member 5; the two support rings 52 are arranged on one round shaft 51, ensuring the coaxiality of the two support rings 52, and further ensuring that the centers of the two parts of the reducing pipe are always coaxial. At the same time, due to the cooperation of the limiting block 56 and the limiting groove 36, the central axes of the external pressing member 3 and the internal supporting member 5 also remain coaxial, which is beneficial to maintaining the position accuracy of the pipeline during welding and providing guarantee for high-quality welding;

[0038] The support ring 52 provides an overall support framework, while the arc-shaped block 53 enables the support to be adjusted according to the change of the pipeline diameter through movability and close fit with the inner wall of the pipeline. The combination of the two realizes the function of supporting and positioning the pipeline from the inside. The inner frame 32 limits and clamps the pipeline from the outside. The two apply forces synchronously, realizing the all-round constraint of the pipeline, effectively preventing the pipeline from deforming due to uneven force during welding, and ensuring the welding quality.

[0039] A frustum 54 is slidably connected to the middle of the support ring 52. By moving the frustum 54, the distance from the outer wall of the arc-shaped block 53 to the center of the support ring 52 can be changed, enabling it to flexibly adapt to pipes of different diameters, enhancing the adaptability of the inner support member 5 to the reduced-diameter pipe, effectively solving the support problem during the welding of the reduced-diameter pipe. The driving of each frustum 54 is controlled by a separate driving member, and they do not affect each other. An arc-shaped block 53 is arranged on the outer wall of the support ring 52. When the frustum 54 moves in the middle of the support ring 52, the arc-shaped block 53 moves outward along the outer wall of the support ring 52 and jointly limits the pipe during the welding process with the outer pressing member 3. A ball 536 for rolling friction with the inner wall of the pipe is arranged on the outer wall of the arc-shaped block 53. A channel 55 for restricting the sliding track of the frustum 54 is opened on the outer surface of the round shaft 51. A circular channel for the round shaft 51 to pass through is opened in the middle of the frustum 54. The outer surface of the frustum 54 is designed in a frustum shape, and a planar area is symmetrically designed on the outer wall of the frustum 54, locally replacing the original continuous conical surface with a plane. A round groove 521 for facilitating the sliding of the frustum 54 is opened in the middle of the support ring 52. Guide blocks 532 are symmetrically arranged on the inner wall of the round groove 521. The other end of the guide block 532 is fixedly connected to a fixed rod 531. The other end of the fixed rod 531 is fixedly connected to the arc-shaped block 53. One end of the arc-shaped block 53 is fixedly connected to a groove 533, and the other end of the arc-shaped block 53 is fixedly connected to a convex block 534 that engages with the groove 533. As the diameter of the ring formed by the arc-shaped blocks 53 changes, the groove 533 and the convex block 534 on its side can move accordingly and closely fit with the inner wall of the pipe of different diameters, realizing effective fixation of the inner wall of the pipe, improving the stability of the arc-shaped block 53 in supporting the pipe, and preventing the pipe from shaking or displacing during the welding process.

[0040] Reference Figure 4 and Figure 5 Equidistant limit rings 535 are fixedly arranged on the outer wall of the arc-shaped block 53. The top of the limit ring 535 is designed to be inclined inward. The ball 536 is located in the middle of the limit ring 535. A rubber layer in flexible contact with the ball 536 is arranged at the bottom of the ball 536. Micro balls 536 are embedded in the contact surface between the arc-shaped block 53 and the pipe, changing the sliding friction between the inner wall of the pipe and the arc-shaped block 53 into rolling friction, reducing the friction force, lowering the energy loss and component wear, improving the rotational flexibility, making the pipe rotate more smoothly, and being beneficial to ensuring the welding quality.

[0041] Before the start of the welding operation, the arc-shaped block 53 of the inner support member 5 is closely attached to the inner wall of the refrigeration pipe through radial expansion and contraction. At this time, the balls 536 evenly distributed on the surface of the arc-shaped block 53 are already in the working state. When the outer pressing member 3 drives the pipe to start rotating for welding, rolling friction is generated between the inner wall of the pipe and the balls 536, and the balls 536 rotate accordingly to reduce the friction force. During this process, if the welding slag generated by the high-temperature welding splashes onto the surface of the balls 536, the balls 536 will continue to rotate as the pipe rotates.

[0042] As the ball 536 rotates, its surface will periodically come into contact with the limiting ring 535 on the inner wall of the arc-shaped block 53 that slopes inward. Since the limiting ring 535 and the surface of the ball 536 form a specific angle, when the ball 536 rotates to the contact position, the limiting ring 535 will exert a force on the surface of the ball 536 in the direction of the inclined plane. This force can be decomposed into a pressure perpendicular to the surface of the ball 536 and a tangential force in the direction of the rotation of the ball 536. The perpendicular pressure causes the limiting ring 535 to closely adhere to the surface of the ball 536, and the tangential force, in coordination with the rotation direction of the ball 536, prompts the welding slag adhering to the surface of the ball 536 to be scraped off during their relative movement. The scraped-off welding slag, under the action of gravity and centrifugal force, slides along the limiting ring 535 to the bottom of the arc-shaped block 53 or the welding operation collection area, thereby achieving automatic cleaning of the surface of the ball 536.

[0043] The timely removal of the welding slag on the surface of the ball 536 avoids the failure of rolling friction caused by the accumulation of welding slag, ensures that the ball 536 always maintains a low friction coefficient, maintains the smooth rotation of the pipeline, and prevents pipeline vibration or welding position deviation caused by sudden changes in friction force; the welding slag scraping structure reduces the wear of the welding slag on the surfaces of the ball 536 and the arc-shaped block 53.

[0044] If the welding slag remains for a long time, it will exacerbate the wear between the ball 536, the inner wall of the pipeline, and the arc-shaped block 53, shortening the service life of the inner support 5. However, this structure significantly improves the durability of the ball 536 and the arc-shaped block 53 through automatic cleaning, reducing the equipment maintenance cost; the clean surface of the ball 536 can provide a stable supporting force, avoiding uneven pipeline support or excessive local stress caused by the influence of welding slag, effectively preventing welding defects such as deformation and depression of the thin-walled refrigeration pipe, and ensuring the consistency and reliability of welding quality;

[0045] The integrated design of the limiting ring 535 and the ball 536 does not require an additional driving device. The automatic cleaning can be achieved by using the rotation of the pipeline during the welding process. The structure is simple and compact, does not increase the complexity of the inner support 5, and at the same time improves the automation degree and operation efficiency of the system; the function of automatically scraping off the welding slag reduces the frequency of manual cleaning of the ball 536, especially suitable for automated welding production lines, reducing the impact on production efficiency caused by frequent shutdowns for maintenance; at the same time, the simplified structure design is also convenient for subsequent maintenance and component replacement.

[0046] The working process of the device is as follows:

[0047] Place the inner support member 5 into the welding part of the variable-diameter refrigeration pipe. The two support rings 52 respectively correspond to different diameter sections of the pipe. The arc-shaped blocks 53 sleeved on the outer wall of the round shaft 51 are initially in a contracted state. After the inner support member 5 extends into the corresponding position inside the pipe, a hydraulic or electric driving device is used to make the frustum 54 slide radially and embed into the circular groove 521 on the inner wall of the support ring 52. The plane on the outer wall of the frustum 54 contacts the guide block 532 arranged on the inner wall of the circular groove 521. The guide block 532 drives the fixed rod 531 and the arc-shaped block 53 to move towards the outer wall of the support ring 52 under the acting force applied by the frustum 54. The grooves 533 and protrusions 534 on the side of the arc-shaped block 53 play a key role. During the diameter change process, the grooves 533 and protrusions 534 of adjacent arc-shaped blocks 53 are seamlessly overlapped through the cooperation of inclined planes, ensuring that the inner walls of the pipes in different diameter sections are uniformly supported. At the same time, it is ensured that the two support rings 52 maintain strict coaxial positioning through the same round shaft 51.

[0048] The outer pressing member 3 moves axially to the welding part. Its central hole forms a precise rotating pair with the support ring 52. The inner frame 32 of the outer pressing member 3 clamps the outer wall of the pipe in a surrounding manner through driving. At the same time, the arc-shaped blocks 53 of the inner support member 5 synchronously apply a radial supporting force. The inner and outer pressure systems are balanced, forming a two-way constraint on the thin-walled pipe and effectively suppressing welding thermal deformation.

[0049] The outer pressing member 3 drives the pipe to rotate at a constant angular velocity. The round shaft 51 of the inner support member 5 is rigidly fixed through a positioning plate 2 at one end and is rotationally connected to the outer pressing member 3 at the other end, ensuring that it remains stationary. The miniature balls 536 embedded in the contact surface of the arc-shaped blocks 53 play a core role in this process, converting the traditional sliding friction into rolling friction, greatly reducing the pipe rotation resistance. The balls 536 adopt a deep groove ball bearing structure and reduce wear through self-lubricating ceramic materials, ensuring that the pipe remains stable during the 360-degree rotary welding process and avoiding coaxiality deviation caused by uneven friction resistance. At the same time, the groove 533 and protrusion 534 structures of the arc-shaped block 53 continuously provide stable support during the rotation process, preventing local instability of the pipe.

[0050] After the welding process is completed, the outer pressing member 3 releases the clamping force and retracts. The driving device of the inner support member 5 moves in the reverse direction, and the frustum 54 moves in the reverse direction, causing the arc-shaped blocks 53 to contract and disengage from the inner wall of the pipe. At this time, the inclined plane design of the groove 533 and protrusion 534 structures ensures that the arc-shaped blocks 53 are reset synchronously, avoiding affecting disassembly due to friction or jamming. During the whole process, the PLC control system monitors the motion parameters of each component in real time through an encoder, realizing the full automation and precise control of the welding process, and effectively guaranteeing the welding quality and production efficiency of the variable-diameter refrigeration pipe.

[0051] Some tiny protrusions are provided on the surface of the ball 536 to increase the friction with the inner wall of the pipe. Without affecting the main function of reducing friction during rolling, the anti-slip performance in the vertical direction is improved, and the stability of the support is enhanced. At the same time, a rubber layer is provided at the bottom end of the ball 536 to provide a certain elastic movement space for the ball 536. When the ball 536 is stressed, the rubber layer can have a certain deformation, reducing the local pressure.

[0052] During the welding process of the variable-diameter refrigeration pipe, the composite inner support structure realizes the double improvement of the support performance and durability by virtue of the modular adaptive design and the rolling friction optimization mechanism. Two coaxially arranged support rings 52 can accurately fit the inner wall of pipes with different diameters through the radially expandable arc-shaped blocks 53. The fitting structure of the grooves 533 and the protrusions 534 on the side of the arc-shaped block 53 ensures seamless connection of the support surface when the diameter changes, thereby providing a stable and uniform circumferential support force for the thin-walled pipe. When the outer pressing member 3 drives the pipe to rotate for welding, the round shaft 51 remains stationary through the connection method of fixed at one end and rotating at the other end. The rigid skeleton inside it provides continuous vertical support for the pipe, effectively resisting the vertical deformation caused by factors such as gravity and thermal stress.

[0053] At the same time, the miniature balls 536 embedded on the surface of the arc-shaped block 53 convert the traditional sliding friction into rolling friction, significantly reducing the contact resistance between the pipe and the inner support member 5. During the rotation of the pipe, the rolling contact of the balls 536 greatly reduces the wear on the surface of the arc-shaped block 53. Compared with the traditional sliding support structure, the surface wear rate is effectively reduced. The balls 536 are made of high-hardness ceramic material and have a precision bearing structure, combined with the self-lubricating coating design, further reducing the contact pressure and the friction coefficient, ensuring that the surface of the arc-shaped block 53 always maintains good flatness and support performance under the high-frequency rotation welding working conditions, thereby prolonging the service life of the inner support member 5 and improving the stability and reliability of the welding equipment.

[0054] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements will not make the essence of the corresponding technical solutions deviate from the protection scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A thin-walled refrigeration pipe non-deformation welding tooling for precise positioning, characterized in that, Including: Workbench (1); Positioning plate (2), the bottom end of the positioning plate (2) is slidably connected to the top end of the workbench (1), the positioning plates (2) are symmetrically distributed centered on the median line of the workbench (1), and an outer pressing member (3) for limiting the outer wall of the pipe is provided at one end of one of the positioning plates (2), and an inner supporting member (5) for supporting the inner wall of the pipe is provided at one end of the other positioning plate (2) close to the outer pressing member (3). The inner supporting member (5) includes a limiting block (56) rotatably connected to the middle of the outer pressing member (3). One end of the limiting block (56) away from the outer pressing member (3) is fixedly connected to a round shaft (51). A supporting ring (52) is arranged on the outer surface of the round shaft (51). A frustum (54) is slidably connected to the middle of the supporting ring (52). An arc-shaped block (53) is arranged on the outer wall of the supporting ring (52). When the frustum (54) moves in the middle of the supporting ring (52), the arc-shaped block (53) moves outward along the outer wall of the supporting ring (52) and limits the pipe during the welding process together with the outer pressing member (3); Wherein, a ball (536) for rolling friction with the inner wall of the pipe is arranged on the outer wall of the arc-shaped block (53).

2. The non-deformation welding tooling for thin-wall refrigeration pipes with precise positioning according to claim 1, characterized in that: A channel (55) for restricting the sliding track of the frustum (54) is opened on the outer surface of the round shaft (51). A circular channel is penetrated along the structural axis of the frustum (54). The outer surface of the frustum (54) is designed in a frustum shape, and a planar area is symmetrically designed on the outer wall of the frustum (54) to locally replace the original continuous conical surface with a plane.

3. A thin-walled refrigeration pipe non-deformation welding tooling for precise positioning according to claim 1, characterized in that: A round groove (521) facilitating the sliding of the frustum (54) is opened in the middle of the supporting ring (52). Guide blocks (532) are symmetrically arranged on the inner wall of the round groove (521). The other end of the guide block (532) is fixedly connected to a fixing rod (531). The other end of the fixing rod (531) is fixedly connected to the arc-shaped block (53).

4. A non-deformation welding tool for thin-walled refrigeration pipes with precise positioning according to claim 1, characterized in that: A groove (533) is fixedly connected to one end of the arc-shaped block (53), and a convex block (534) engaging with the groove (533) is fixedly connected to the other end of the arc-shaped block (53).

5. A non-deformation welding tooling for thin-walled refrigeration pipes with precise positioning according to claim 1, characterized in that: Limiting rings (535) are fixedly arranged at equal intervals on the outer wall of the arc-shaped block (53). The top ends of the limiting rings (535) are designed to be inclined inward. The ball (536) is located in the middle of the limiting rings (535), and a rubber layer in flexible contact with the ball (536) is arranged at the bottom end of the ball (536).

6. The non-deformation welding tooling for thin-walled refrigeration pipes with precise positioning according to claim 1, characterized in that: The outer pressing member (3) includes a fixing frame (35) fixedly connected to the middle of one end of the positioning plate (2). A motor for driving its rotation is arranged outside the fixing frame (35). A limiting groove (36) is opened in the middle of the other end of the fixing frame (35). The limiting groove (36) is rotatably connected to the limiting block (56). An outer frame (31) is fixedly connected to the other end of the fixing frame (35).

7. A non-deformation welding tooling for thin-walled refrigeration pipes with precise positioning according to claim 6, characterized in that: The outer pressing member (3) further includes an inner frame (32) closely attached to the outer wall of the pipe. The outer wall of the inner frame (32) is movably connected to the inner wall of the outer frame (31) through a telescopic member. The other end of the outer frame (31) is connected to another outer frame (31) through a connecting plate (33) arranged in a snap-fit manner.

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