Thin-walled tube part spin expander

Abstract

This application relates to a thin-walled tube expansion machine, including a worktable with a base. Several mounting blocks are provided on one outer wall of the base, and these mounting blocks are used to pass through bolt holes for a flange. After the flange and pipe are positioned, the end of the pipe extends into the central hole of the flange. An expansion mechanism is provided on the base to expand the section of pipe extending into the central hole of the flange, causing the outer wall of the pipe to fit tightly against the inner wall of the central hole. The expansion mechanism expands the pipe, causing a certain deformation, which fixes the flange joint to the pipe with a certain preload. Because there is no gap between the flange joint and the pipe, there is no displacement during brazing, effectively preventing brazing flow.

Description

Technical Field

[0001] This invention relates to the field of flange positioning, and more particularly to a spin expander for thin-walled tube parts. Background Technology

[0002] Because there is a certain gap between the pipe and flange joint during positioning and connection, the copper brazing material will flow in a molten state during brazing, causing the copper brazing material to flow to other parts and produce brazing marks, which in turn affects the product's firmness and aesthetics. Summary of the Invention

[0003] This application provides a thin-walled tube expansion machine, which can solve the problem of brazing marks caused by copper brazing filler flowing to other parts due to a certain gap when the pipe and flange joint are positioned and connected.

[0004] The thin-walled tube part spinning machine provided in this application adopts the following technical solution:

[0005] A thin-walled tube expansion machine includes a worktable, a base on the worktable, and a plurality of mounting blocks on one outer wall of the base. The mounting blocks are used to pass through the bolt holes of a flange. When the flange and the pipe are positioned, the end of the pipe extends into the central hole of the flange.

[0006] The base is equipped with a tube expansion mechanism, which is used to expand a section of pipe that extends into the center hole of the flange, so that the outer wall of the pipe is tightly attached to the inner wall of the center hole of the flange.

[0007] By adopting the above technical solution, the tube expansion mechanism expands the pipe, causing the pipe to deform to a certain extent, so that the flange joint is fixed on the pipe with a certain preload. Since there is no gap between the flange joint and the pipe, there is no displacement during brazing, which effectively prevents the brazing flow.

[0008] Preferably, the tube expansion mechanism includes an installation cylinder, a hollow elastic expansion core, a conical core, and a driving component. The installation cylinder is mounted on a base, and the hollow elastic expansion core is detachably connected to the end of the installation cylinder near the flange. The driving component is mounted on a workbench and is used to drive the conical core to slide along a direction parallel to the axis of the flange center hole. The conical core passes through the installation cylinder and the hollow elastic expansion core, and the end of the conical core near the pipe is tapered.

[0009] The hollow elastic expansion core has a first end near the flange. The first end extends into the pipe at the end of the flange's central hole. The inner wall of the first end has a tapered profile that matches the end of the conical core. The hollow elastic expansion core has multiple perforations and multiple first through slots along the circumferential direction. The perforations correspond to the first through slots. The perforations are located between the mounting cylinder and the flange. The first through slots are located on the side of the perforation away from the mounting cylinder. One end of the first through slot connects to the corresponding perforation, and the other end of the first through slot penetrates the hollow elastic expansion core towards the side away from the mounting cylinder. The portion of the hollow elastic expansion core between adjacent first through slots is a deformation block, which is used to compress the inner wall of the pipe.

[0010] By adopting the above technical solution, during the pipe expansion operation, the driving component drives the cone core to move towards one side of the pipe. The end of the cone core abuts against the inner wall of the first end of the hollow elastic expansion core, which expands multiple deformation blocks. The deformation blocks squeeze the inner wall of the pipe, causing the pipe to produce a certain deformation, thereby expanding the pipe.

[0011] Preferably, the outer wall of the deformable block is provided with teeth, and the teeth on multiple deformable blocks form a toothed ring, which is used to compress the inner wall of the pipe.

[0012] By adopting the above technical solution, during the process of the deformation block being stretched and pressed against the pipeline, the toothed part has a smaller contact area with the inner wall of the pipeline compared to the deformation block, so the pressure effect is more obvious. The toothed part will further squeeze the inner wall of the pipeline and cause the pipeline to deform to a certain extent. At the same time, the toothed part can also axially limit the connection between the pipeline and the flange, and improve the connection stability between the pipeline and the flange.

[0013] Preferably, the tube expansion mechanism further includes a second driving component and a bearing. The bearing is disposed in the base, the mounting cylinder passes through the bearing and rotates on the base through the bearing, and the second driving component drives the mounting cylinder to rotate.

[0014] By adopting the above technical solution, the installation cylinder is driven to rotate, which in turn drives the hollow elastic expansion core to rotate. After the multiple teeth rotate, they will squeeze the gap between the pipes, causing the pipes to form an annular protrusion. The annular protrusion will be embedded in the flange, thereby further filling the gap that may exist between the pipes and the flange.

[0015] Preferably, it further includes an auxiliary recovery device, which includes a collar and a driving component three. The collar is sleeved on the hollow elastic expansion core, and the inner diameter of the collar is equal to the outer diameter of the hollow elastic expansion core in the relaxed state. The driving component three drives the collar to slide along the axial direction of the hollow elastic expansion core.

[0016] By adopting the above technical solution, since the recovery of the hollow elastic expansion core relies on its own elastic deformation, after being squeezed and expanded by the cone core multiple times, the hollow elastic expansion core will be difficult to return to its original state. This will increase the diameter of the first end in the relaxed state, making it difficult to fit the first end of the pipe during installation. At this time, by using a collar to assist the first end of the hollow elastic expansion core to recover its deformation, the difficulty in fitting the first end of the pipe can be reduced.

[0017] Preferably, the driving component three includes a first gear, a first tooth surface, a second tooth surface, and a connecting rod. A second through groove is provided on the inner wall of the hollow elastic expansion core. The first gear rotates in the second through groove. The first tooth surface is disposed on the outer wall of the cone core. The second tooth surface is disposed on the connecting rod. The connecting rod is fixed on the collar and moves with the collar. The first tooth surface and the second tooth surface are respectively located on both sides of the first gear and mesh on the first gear. When the cone core squeezes out the deformation block, the collar is located on the side of the perforation closer to the mounting cylinder.

[0018] By adopting the above technical solution, when the cone core squeezes out the deformation block, the movement of the cone core drives the first gear to rotate. The rotation of the first gear drives the connecting rod to move in the opposite direction to the movement of the cone core, thereby driving the collar to move away from the first end to the side of the perforation closer to the mounting cylinder. At this time, the collar will not affect the deformation of the first end of the hollow elastic expansion core. When the cone core moves away from the pipe, the collar will move towards the first end, thereby helping the first end to contract and restore its deformation.

[0019] Preferably, the mounting block is provided with a first limiting device for limiting the flange hanging on the mounting block. The first limiting device includes a stop block and a driving member four. A sliding groove is provided on the side wall of the mounting block. The stop block slides in the sliding groove in a direction perpendicular to the flange axis. The driving member four drives the stop block to slide. An inclined surface is provided on the side of the stop block facing the base. The stop block is located on the side of the flange away from the base. When the stop block extends out of the sliding groove, the inclined surface is used to abut against the flange.

[0020] By adopting the above technical solution, when the pipeline is being expanded, there are certain requirements for the position of the flange. Ideally, the flange should be in a state of being close to the base so that it will not move arbitrarily during the pipeline expansion process. The flange is slid by the four-drive abutment block of the drive component, and the inclined surface gradually pushes the flange toward the base until it abuts against the base, thereby fixing the position of the flange.

[0021] Preferably, it further includes a second limiting device for limiting the length of the pipe end extending into the flange. The abutment is provided with a connecting frame, which slides with the abutment in the base. The second limiting device includes a moving block, a spring, a limiting block, and a withdrawal component. The two ends of the spring are respectively fixed to the moving block and the limiting block. The moving block is located on the side of the abutment away from the pipe. The moving block slides in the base along a sliding direction parallel to the cone core. The connecting frame and the moving block are slidably connected to each other along an inclined direction.

[0022] As the abutment block extends out of the groove and abuts against the flange, the limiting block moves toward the flange center hole until it extends into the center hole. The limiting block is located at one-third of the axial length of the flange center hole and is used for the pipe to abut against it. The extraction component is used to drive the limiting block to move out of the center hole when the pipe expansion mechanism performs pipe expansion operation.

[0023] By adopting the above technical solution, when welding pipes to flanges, there are certain requirements on the length of the pipe extending into the flange. Ideally, the end of the pipe should be able to extend into two-thirds of the axial length of the flange's central hole. For flanges of different thicknesses, the position of the abutment block after positioning the flange is also different. According to the change in the position of the abutment block, the abutment block drives the moving block to change position through the connecting frame. The moving block then drives the limiting block to move through the spring, so that the limiting block can move towards the flange's central hole to the position of one-third of the axial length extending into the flange's central hole. When the pipe and flange are initially installed, the pipe will abut against the limiting block when it extends into the central hole, helping the operator to determine the appropriate docking position of the pipe.

[0024] Preferably, the extraction component includes a first ring and a first rod. The first ring is coaxially fixed on the ring sleeve. A gap is left between the circumferential inner wall of the first ring and the hollow elastic expansion core to allow for the deformation of the hollow elastic expansion core. An annular groove is formed on the inner wall of the first ring. One end of the first rod is disposed on the limiting block. The other end of the first rod passes through the spring and the moving block. The end of the first rod away from the limiting block extends into the gap between the first ring and the hollow elastic expansion core. The end of the first rod away from the limiting block is bent toward the annular groove and forms a hook. When the sleeve moves to the side of the perforation close to the mounting cylinder, the first ring pulls the hook on the first rod, and the limiting block moves out of the center hole of the flange.

[0025] By adopting the above technical solution, during the tube expansion operation, as the cone core moves, the collar drives the first ring to move away from the first end. After the first ring moves a certain distance, it will abut against the hook of the first rod and drive the first rod to move away from the first end together. At this time, the first rod will overcome the elastic force of the spring and drive the limiting block to move out of the center hole, so that the deformation block will not squeeze the limiting block.

[0026] The main technical effects of this invention are reflected in the following aspects:

[0027] 1. This invention expands the pipe by setting up an expansion mechanism, so that the pipe has a certain deformation and the flange joint is fixed on the pipe with a certain preload. Since there is no gap between the flange joint and the pipe, there is no displacement during brazing, which effectively prevents the brazing flow.

[0028] 2. By setting teeth, the deformation block is stretched and abuts against the pipeline. Since the contact area between the teeth and the inner wall of the pipeline is smaller than that between the deformation block and the pipeline, the pressure effect is more obvious. The teeth will further squeeze the inner wall of the pipeline and cause the pipeline to deform. At the same time, the teeth can also axially limit the connection between the pipeline and the flange, improving the connection stability between the pipeline and the flange.

[0029] 3. By driving the installation cylinder to rotate, the installation cylinder drives the hollow elastic expansion core to rotate. After the multiple teeth rotate, they will squeeze the gap between the pipes, causing the pipes to form an annular protrusion. The annular protrusion will embed into the flange, thereby further filling any gaps that may exist between the pipes and the flange. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0031] Figure 2 This is a schematic diagram of the structure of the second driver component in the embodiment of this application.

[0032] Figure 3 It is along Figure 1 A cross-sectional view along line AA in the middle.

[0033] Figure 4 yes Figure 3 Enlarged view of point B in the middle.

[0034] Figure 5 This is a cross-sectional view of the internal structure of the base during the tube expansion operation in an embodiment of this application.

[0035] Figure 6 yes Figure 5 Enlarged view of point C in the middle.

[0036] Figure 7 yes Figure 6 Enlarged view of point D in the middle.

[0037] Figure 8 This is a schematic diagram of the hollow elastic expansion core in an embodiment of this application.

[0038] Explanation of reference numerals in the attached drawings: 1. Workbench; 11. Base; 111. Mounting block; 112. Slide groove; 12. Support frame; 13. Support seat; 21. Flange; 211. Bolt hole; 212. Center hole; 22. Pipe; 3. Tube expansion mechanism; 31. Mounting cylinder; 32. Hollow elastic expansion core; 321. Perforation; 322. First through groove; 323. Deformation block; 324. Gear; 325. Gear ring; 326. Second through groove; 327. First end; 33. Conical core; 34. Drive component one; 341. First cylinder; 35. Drive component two; 351. Electric... 352. Second gear; 36. Bearing; 4. Auxiliary recovery device; 41. Collar; 42. Drive component three; 421. First gear; 422. First tooth surface; 423. Second tooth surface; 424. Connecting rod; 5. First limiting device; 52. Abutment block; 521. Inclined surface; 522. Connecting frame; 53. Drive component four; 531. Second cylinder; 6. Second limiting device; 61. Moving block; 62. Spring; 63. Limiting block; 7. Extraction component; 71. First ring; 711. Ring groove; 72. First rod; 721. Hook; 722. Ball bearing. Detailed Implementation

[0039] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail to make the technical solution of this application easier to understand and master.

[0040] This application discloses a spin expander for thin-walled tube parts.

[0041] Reference Figures 1-8 An embodiment of this application provides a thin-walled tube expansion machine, which includes a worktable 1. A base 11 is mounted on the worktable 1. Two mounting blocks 111 are fixed on one outer wall of the base 11. The two mounting blocks 111 are distributed vertically on the base 11 and are used to pass through two symmetrical bolt holes 211 on a flange 21. After the flange 21 and the pipe 22 are positioned, the end of the pipe 22 extends into the central hole 212 of the flange 21. An expansion mechanism 3 is provided on the base 11. The expansion mechanism 3 is used to expand the section of pipe 22 that extends into the central hole 212 of the flange 21, so that the outer wall of the pipe 22 is tightly attached to the inner wall of the central hole 212 of the flange 21.

[0042] Reference Figures 1-8 The expansion mechanism 3 expands the pipe 22, causing the pipe 22 to have a certain deformation, so that the flange 21 joint is fixed on the pipe 22 with a certain pre-tightening force. Since there is no gap between the flange 21 joint and the pipe 22, there is no displacement during brazing, which effectively prevents the brazing flow.

[0043] Reference Figures 1-8The tube expansion mechanism 3 includes a mounting cylinder 31, a hollow elastic expansion core 32, a conical core 33, a first driving component 34, a second driving component 35, and two bearings 36. The mounting cylinder 31 rotates on the base 11 via the two bearings 36, and the second driving component 35 drives the mounting cylinder 31 to rotate. The second driving component 35 includes a motor 351 and three second gears 352. The worktable 1 includes several support frames 12 fixed on the platform. The motor 351 is fixed on the support frame 12. One second gear 352 is coaxially fixed on the output shaft of the motor 351, another second gear 352 is coaxially fixed on the mounting cylinder 31, and the third second gear 352 rotates on the support frame 12. The axes of the three second gears 352 are parallel to each other, arranged in a line, and meshing with each other. The rotation of the output shaft of the motor 351 drives the mounting cylinder 31 to rotate via the three second gears 352.

[0044] Reference Figures 1-8 One end of the hollow elastic expansion core 32 is threaded to the end of the mounting cylinder 31 near the flange 21. The driving component 34 is mounted on the support frame 12 and is used to drive the cone core 33 to slide along the axis parallel to the center hole 212 of the flange 21. The cone core 33 passes through the mounting cylinder 31 and the hollow elastic expansion core 32. The end of the cone core 33 near the pipe 22 is set in a tapered shape.

[0045] Reference Figures 1-8 The driving component 34 includes a first cylinder 341, which is fixed on the support frame 12. The first cylinder 341 is located on the side of the base 11 away from the flange 21. The piston rod of the first cylinder 341 is fixed on the end of the cone core 33 away from the flange 21, driving the cone core 33 to move.

[0046] Reference Figures 1-8 The hollow elastic expansion core 32 has a first end 327 at the end near the flange 21. The first end 327 extends into the pipe 22 at the end of the central hole 212 of the flange 21. The surface profile of the inner wall of the first end 327 is tapered to match the end of the conical core 33. The hollow elastic expansion core 32 has multiple through holes 321 and multiple first through grooves 322 along the circumferential direction. The multiple through holes 321 correspond to the multiple first through grooves 322. The through holes 321 are located between the mounting cylinder 31 and the flange 21. The first through grooves 322 are located on the side of the through holes 321 away from the mounting cylinder 31. One end of the first through groove 322 is connected to the corresponding through hole 321. The other end of the first through groove 322 passes through the hollow elastic expansion core 32 on the side away from the mounting cylinder 31. The part of the hollow elastic expansion core 32 between adjacent first through grooves 322 is a deformation block 323, which is used to compress the inner wall of the pipe 22.

[0047] Reference Figures 1-8During the expansion operation, the drive unit 34 drives the cone core 33 to move toward one side of the pipe 22. The end of the cone core 33 abuts against the inner wall of the first end 327 on the hollow elastic expansion core 32, which expands the multiple deformation blocks 323. The deformation blocks 323 squeeze the inner wall of the pipe 22, causing the pipe 22 to produce a certain deformation, thereby expanding the pipe 22.

[0048] Reference Figures 1-8 Two teeth 324 are fixed on the outer wall of the deformable block 323 along the axial direction of the hollow elastic expansion core 32. The two teeth 324 on the multiple deformable blocks 323 form two toothed rings 325, and both toothed rings 325 are used to compress the inner wall of the pipe 22.

[0049] Reference Figures 1-8 As the deformation block 323 is stretched and pressed against the pipe 22, the toothed part 324 has a smaller contact area with the inner wall of the pipe 22 compared to the deformation block 323, so the pressure effect is more obvious. The toothed part 324 will further compress the inner wall of the pipe 22 and cause the pipe 22 to produce a certain deformation. At the same time, the toothed part 324 can also axially limit the connection between the pipe 22 and the flange 21, improving the connection stability between the pipe 22 and the flange 21. By driving the mounting cylinder 31 to rotate, the mounting cylinder 31 drives the hollow elastic expansion core 32 to rotate. After the multiple teeth 324 rotate, they will compress the gap between the pipe 22, causing the pipe 22 to form an annular protrusion. The annular protrusion will embed into the flange 21, thereby further filling any gaps that may exist between the pipe 22 and the flange 21.

[0050] Reference Figures 1-8 The thin-walled tube part spinning machine of this application embodiment also includes an auxiliary recovery device 4. The auxiliary recovery device 4 includes a collar 41 and a driving member 42. The collar 41 is sleeved on the hollow elastic expansion core 32. The inner diameter of the collar 41 is equal to the outer diameter of the hollow elastic expansion core 32 in the relaxed state. The driving member 42 drives the collar 41 to slide along the axial direction of the hollow elastic expansion core 32.

[0051] Reference Figures 1-8 Since the hollow elastic expansion core 32 recovers by its own elastic deformation, after being squeezed and stretched multiple times by the cone core 33, the hollow elastic expansion core 32 will be difficult to return to its original state. This will increase the diameter of the first end 327 in the relaxed state, making it difficult to fit the first end 327 into the pipe 22 during installation. At this time, by using the collar 41 to assist the first end 327 of the hollow elastic expansion core 32 to recover its deformation, the situation of the pipe 22 being difficult to fit the first end 327 into the pipe can be reduced.

[0052] Reference Figures 1-8The driving component 32 includes two first gears 421, two first tooth surfaces 422, two second tooth surfaces 423, and two connecting rods 424. Two second through slots 326 are formed on the inner wall of the hollow elastic expansion core 32, facing each other and located between the through hole 321 and the mounting cylinder 31. The two first gears 421 correspond to the two second through slots 326 respectively, rotating within their respective slots. The rotation axis of the first gears 421 is perpendicular to the axis of the hollow elastic expansion core 32. The two first tooth surfaces 422 are respectively disposed on the outer walls of both sides of the conical core 33, and the two second tooth surfaces 423 are respectively disposed on the two connecting rods 424. One end of each connecting rod 424 near the flange 21 is fixed to the collar 41 and moves with the collar 41. The two connecting rods 424 are located on both sides of the hollow elastic expansion core 32. The first tooth surface 422 and the second tooth surface 423 are located on both sides of the corresponding first gear 421 and mesh with the first gear 421. The teeth 324 of the first gear 421 can extend to the inner and outer sides of the second through groove 326. Neither the connecting rod 424 nor the cone core 33 directly contacts the hollow elastic expansion core 32, and neither the first tooth surface 422 nor the second tooth surface 423 contacts the hollow elastic expansion core 32.

[0053] Reference Figures 1-8 When the cone core 33 pushes open the deformation block 323, the movement of the cone core 33 drives the first gear 421 to rotate. The rotation of the first gear 421 drives the connecting rod 424 to move in the opposite direction to the movement of the cone core 33, thereby driving the collar 41 to move away from the first end 327 to the side of the perforation 321 closer to the mounting cylinder 31. At this time, the collar 41 is located on the side of the perforation 321 closer to the mounting cylinder 31, and the collar 41 will not affect the deformation of the first end 327 of the hollow elastic expansion core 32. When the cone core 33 moves away from the pipe 22, the collar 41 will move towards the first end 327, thereby helping the first end 327 to contract and recover its deformation.

[0054] Reference Figures 1-8 The mounting block 111 is provided with a first limiting device 5 for limiting the flange 21 hanging on the mounting block 111. The first limiting device 5 includes a stop block 52 and a driving member 53. A sliding groove 112 is provided on the side wall of the mounting block 111. The stop block 52 slides in the sliding groove 112 in a direction perpendicular to the axis of the flange 21. The driving member 53 drives the stop block 52 to slide. An inclined surface 521 is provided on the side of the stop block 52 facing the base 11. The stop block 52 is located on the side of the flange 21 away from the base 11. When the stop block 52 extends out of the sliding groove 112, the inclined surface 521 is used to abut against the flange 21.

[0055] Reference Figures 1-8When the pipe 22 is being expanded, there are certain requirements for the position of the flange 21. The flange 21 should ideally be in a state of being close to the base 11, so that the flange 21 will not move randomly during the expansion of the pipe 22. The drive component 53 drives the abutment block 52 to slide, and the inclined surface 521 pushes the flange 21 towards the base 11 until it abuts against the base 11, thereby fixing the position of the flange 21.

[0056] Reference Figures 1-8 The thin-walled tube expansion machine according to an embodiment of this application further includes two second limiting devices 6 for limiting the length of the end of the pipe 22 extending into the flange 21. The two second limiting devices 6 are respectively located on both sides of the hollow elastic expansion core 32. A connecting frame 522 is fixed on the abutment 52, and the connecting frame 522 slides with the abutment 52 within the base 11 and the mounting block 111. The driving component 53 is a second cylinder 531, which is fixed within the base 11. The piston rod of the second cylinder 531 is fixed on the connecting frame 522, driving the connecting frame 522 to slide along a sliding direction parallel to the abutment 52.

[0057] Reference Figures 1-8 The second limiting device 6 includes a moving block 61, a spring 62, a limiting block 63, and a withdrawing component 7. The two ends of the spring 62 are fixed to the moving block 61 and the limiting block 63, respectively. The moving block 61 is located on the side of the abutment 52 away from the pipe 22. The moving block 61 slides within the base 11 along a sliding direction parallel to the cone core 33. The connecting frame 522 is T-shaped, and its end facing the hollow elastic expansion core 32 is slidably connected to the moving block 61 along an inclined direction. When the abutment 52 extends out of the groove 112 and abuts against the flange 21, the limiting block 63 moves towards the center hole 212 of the flange 21 until it extends into the center hole 212. The limiting block 63 is located at one-third of the axial length of the center hole 212 of the flange 21, and is used for the pipe 22 to abut against it. The withdrawing component 7 is used to drive the limiting block 63 out of the center hole 212 when the expansion mechanism 3 performs expansion operations on the pipe 22.

[0058] Reference Figures 1-8When welding pipe 22 to flange 21, there are certain requirements for the length of pipe 22 extending into flange 21. Ideally, the end of pipe 22 should be able to extend into two-thirds of the axial length of the center hole 212 of flange 21. For flanges 21 of different thicknesses, the position of abutment block 52 after positioning flange 21 is also different. According to the position change of abutment block 52, abutment block 52 drives the moving block 61 to change position through connecting bracket 522. The moving block 61 then drives the limiting block 63 to move through spring 62, so that the limiting block 63 can move towards the center hole 212 of flange 21 to the position of one-third of the axial length of the center hole 212 of flange 21. When pipe 22 and flange 21 are initially installed, pipe 22 will abut against the limiting block 63 when it extends into the center hole 212, helping the operator to determine the appropriate docking position of pipe 22.

[0059] Reference Figures 1-8 The extraction component 7 includes a first ring 71 and a first rod 72. The first ring 71 on the two extraction components 7 is the same first ring 71. The first ring 71 is coaxially fixed on the ring sleeve. A gap is left between the circumferential inner wall of the first ring 71 and the hollow elastic expansion core 32 for the hollow elastic expansion core 32 to deform. A ring groove 711 is opened on the inner wall of the first ring 71.

[0060] Reference Figures 1-8 The first rod 72 on each of the two extraction parts 7 corresponds to one of the two limiting blocks 63. The first rod 72 has a certain degree of toughness. One end of the first rod 72 is fixed to the corresponding limiting block 63, and the other end of the first rod 72 passes through the corresponding spring 62 and the corresponding moving block 61. The first rod 72 slides on the moving block 61 along a direction parallel to the axis of the conical core 33. The end of the first rod 72 away from the limiting block 63 extends into the gap between the first ring 71 and the hollow elastic expansion core 32. The end of the first rod 72 away from the limiting block 63 bends toward the ring groove 711 and forms a hook 721. When the collar 41 moves to the side of the through hole 321 close to the mounting cylinder 31, the first ring 71 pulls the hook 721 on the first rod 72, and the limiting block 63 moves out of the center hole 212 of the flange 21.

[0061] Reference Figures 1-8 During the tube expansion operation, as the cone core 33 moves, the collar 41 drives the first ring 71 to move away from the first end 327. After moving a certain distance, the first ring 71 will abut against the hook 721 of the first rod 72, causing the first rod 72 to move away from the first end 327 as well. At this time, the first rod 72 will overcome the elastic force of the spring 62 and drive the limiting block 63 to move out of the center hole 212, so that the deformation block 323 does not squeeze the limiting block 63. After the tube expansion operation is completed, the limiting block 63 will reset. When the abutment block 52 is released and the flange 21 is removed, the limiting block 63 will move into the base 11.

[0062] Reference Figures 1-8The hook 721 has a rotating ball 722, which is used to abut against the inner wall of the annular groove 711 on the side away from the sleeve, reducing the influence of the rotation of the first ring 71 on the first rod 72.

[0063] Reference Figures 1-8 The workbench 1 is detachably connected to a support base 13 that supports the pipe 22. The support base 13 is installed on the workbench 1 by bolts, which can assist the operator so that the operator does not have to hold the pipe 22 and the flange 21 for positioning.

[0064] Reference Figures 1-8 To facilitate the installation of the above structure within the base 11, the base 11 is assembled from multiple modules.

[0065] Of course, the above are just typical examples of the present invention. In addition, the present invention may have many other specific embodiments. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed by the present invention.

Claims

1. A spin expander for thin-walled tube parts, characterized in that: Includes a workbench (1), on which a base (11) is provided, and on one side of the outer wall of the base (11) are a plurality of mounting blocks (111), which are used to pass through the bolt holes (211) of the flange (21). When the flange (21) and the pipe (22) are positioned, the end of the pipe (22) extends into the center hole (212) of the flange (21). The base (11) is provided with a tube expansion mechanism (3), which is used to expand a section of pipe (22) that extends into the center hole (212) of the flange (21) so that the outer wall of the pipe (22) is tightly attached to the inner wall of the center hole (212) of the flange (21); The tube expansion mechanism (3) includes an installation cylinder (31), a hollow elastic expansion core (32), a cone core (33), and a driving component (34). The installation cylinder (31) is mounted on the base (11). The hollow elastic expansion core (32) is detachably connected to one end of the installation cylinder (31) near the flange (21). The driving component (34) is mounted on the workbench (1) and is used to drive the cone core (33) to slide along the axis parallel to the center hole (212) of the flange (21). The cone core (33) passes through the installation cylinder (31) and the hollow elastic expansion core (32). The end of the cone core (33) near the pipe (22) is tapered. The hollow elastic expansion core (32) has a first end (327) near the flange (21). The first end (327) extends into the pipe (22) at the end of the central hole (212) of the flange (21). The inner wall of the first end (327) has a tapered shape that matches the end of the conical core (33). The hollow elastic expansion core (32) has multiple through holes (321) and multiple first through slots (322) along the circumferential direction. The multiple through holes (321) correspond to the multiple first through slots (322). Located between the mounting cylinder (31) and the flange (21), the first through groove (322) is located on the side of the perforation (321) away from the mounting cylinder (31). One end of the first through groove (322) is connected to the corresponding perforation (321), and the other end of the first through groove (322) passes through the hollow elastic expansion core (32) on the side away from the mounting cylinder (31). The part of the hollow elastic expansion core (32) between adjacent first through grooves (322) is a deformation block (323). The deformation block (323) is used to squeeze the inner wall of the pipe (22). It also includes an auxiliary recovery device (4), which includes a collar (41) and a driving component (42). The collar (41) is sleeved on the hollow elastic expansion core (32). The inner diameter of the collar (41) is equal to the outer diameter of the hollow elastic expansion core (32) in the relaxed state. The driving component (42) drives the collar (41) to slide along the axial direction of the hollow elastic expansion core (32). The driving component three (42) includes a first gear (421), a first tooth surface (422), a second tooth surface (423), and a connecting rod (424). A second through groove (326) is provided on the inner wall of the hollow elastic expansion core (32). The first gear (421) rotates in the second through groove (326). The first tooth surface (422) is provided on the outer wall of the cone core (33). The second tooth surface (423) is provided on the connecting rod (424). The connecting rod (424) is fixed on the collar (41) and moves with the collar (41). The first tooth surface (422) and the second tooth surface (423) are located on both sides of the first gear (421) and mesh on the first gear (421). When the cone core (33) squeezes open the deformation block (323), the collar (41) is located on the side of the perforation (321) close to the mounting cylinder (31).

2. The thin-walled tube part spinning machine according to claim 1, characterized in that: The outer wall of the deformable block (323) is provided with teeth (324), and the teeth (324) on the multiple deformable blocks (323) form toothed rings (325), which are used to compress the inner wall of the pipe (22).

3. The thin-walled tube part spinning machine according to claim 1, characterized in that: The tube expansion mechanism (3) also includes a second driving component (35) and a bearing (36). The bearing (36) is disposed in the base (11). The mounting cylinder (31) passes through the bearing (36) and rotates on the base (11) through the bearing (36). The second driving component (35) drives the mounting cylinder (31) to rotate.

4. The thin-walled tube part spinning machine according to claim 1, characterized in that: The mounting block (111) is provided with a first limiting device (5) for limiting the flange (21) hanging on the mounting block (111). The first limiting device (5) includes a stop block (52) and a driving member (53). A sliding groove (112) is provided on the side wall of the mounting block (111). The stop block (52) slides in the sliding groove (112) in a direction perpendicular to the axis of the flange (21). The driving member (53) drives the stop block (52) to slide. An inclined surface (521) is provided on the side of the stop block (52) facing the base (11). The stop block (52) is located on the side of the flange (21) away from the base (11). When the stop block (52) extends out of the sliding groove (112), the inclined surface (521) is used to abut against the flange (21).

5. A thin-walled tube part spinning machine according to claim 4, characterized in that: It also includes a second limiting device (6) for limiting the length of the pipe (22) end extending into the flange (21). The abutment (52) is provided with a connecting frame (522), which slides in the base (11) following the abutment (52). The second limiting device (6) includes a moving block (61), a spring (62), a limiting block (63), and a pull-out member (7). The two ends of the spring (62) are fixed on the moving block (61) and the limiting block (63) respectively. The moving block (61) is located on the side of the abutment (52) away from the pipe (22). The moving block (61) slides in the base (11) in a sliding direction parallel to the cone core (33). The connecting frame (522) and the moving block (61) are slidably connected to each other in an inclined direction. As the abutment block (52) extends out of the groove (112) and abuts against the flange (21), the limiting block (63) moves toward the center hole (212) of the flange (21) until it extends into the center hole (212). The limiting block (63) is located at one-third of the axial length of the center hole (212) of the flange (21) and is used for the pipe (22) to abut against it. The extraction component (7) is used to drive the limiting block (63) to move out of the center hole (212) when the expansion mechanism (3) performs the expansion operation on the pipe (22).

6. A thin-walled tube part spinning machine according to claim 5, characterized in that: The extraction component (7) includes a first ring (71) and a first rod (72). The first ring (71) is coaxially fixed on a ring sleeve. A gap is left between the circumferential inner wall of the first ring (71) and the hollow elastic expansion core (32) to allow the hollow elastic expansion core (32) to deform. A ring groove (711) is formed on the inner wall of the first ring (71). One end of the first rod (72) is set on the limiting block (63), and the other end of the first rod (72) passes through the spring (62) and the moving block (61). 72) The end away from the limiting block (63) extends into the gap between the first ring (71) and the hollow elastic expansion core (32). The end of the first rod (72) away from the limiting block (63) is bent toward the ring groove (711) and forms a hook (721). When the collar (41) moves to the side of the perforation (321) close to the mounting cylinder (31), the first ring (71) pulls the hook (721) on the first rod (72), and the limiting block (63) moves out of the center hole (212) of the flange (21).

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