A preparation device for spiral plum blossom tube

Abstract

The present invention relates to a pipe preparation device, in particular, a spiral plum blossom pipe preparation device, comprising: a forming device for rolling a round pipe into a plum blossom pipe segment; a transition device, provided on the forming device, for driving the forming device to form a transition segment from the round pipe to the plum blossom pipe segment; a drawing device, provided on one side of the forming device, for drawing the round pipe; and a rotating device, provided on the drawing device, for rotating the round pipe to form the spiral plum blossom pipe. The spiral plum blossom pipe preparation device provided by the present invention completes the forming of the transition segment and the plum blossom pipe segment through the transition device in conjunction with the forming device, realizes the forming of the spiral pipe segment through the drawing device and the rotating device, and then completes the processing of the spiral plum blossom pipe with the transition segment, while having a simple structure and control.

Description

Technical Field

[0001] The invention relates to a pipe preparation device, in particular to a spiral plum blossom pipe preparation device. Background Art

[0002] Special-shaped tubes are used in heat exchange equipment in the nuclear power sector. These tubes feature a special-shaped cross-section and a spirally extended structure that intersects with conventional round tubes. Within the same volume, the heat exchange area of these components is significantly increased. The spiral structure stabilizes the heat transfer process, and the extremely thin wall thickness enhances thermal conductivity and increases heat transfer efficiency. According to design requirements, the special-shaped tubes are tapered at both ends, with a plum blossom-shaped center and a spiral. The refined steel tubes combine a small outer diameter with a thin wall thickness. Their unique shape and characteristics place higher demands on the manufacturing process. The forming stage requires transitioning from a straight tube to a plum blossom shape, with the plum blossom shape simultaneously spiraling, and then from the plum blossom shape back to a straight tube. Finally, the tubes are tapered at both ends. While completing these forming processes, the dimensional accuracy and surface quality of the formed tubes must also be ensured.

[0003] like Figures 9 to 11 As shown, the spiral plum blossom tube includes necking sections 13 at both ends, a transition section 12 located on one side of the necking section 13 and a spiral plum blossom tube section 11 located between the two transition sections 12. The transition section 12 has a certain length and is also spirally arranged.

[0004] An existing method involves forming plum blossom-shaped tubes using a cold drawing machine with a specially shaped outer die. Installing an outer die assembly and adding a rotary drive mechanism allows for spiral forming. However, cold drawing is not possible for the transition from round tube to plum blossom-shaped tube, and vice versa.

[0005] Another method uses a cross punching device to make a pressing block of the corresponding shape to realize the formation of a plum blossom-shaped tube. However, it cannot realize the spiral forming of the tube. Summary of the Invention

[0006] In order to solve the problem that the above-mentioned existing equipment cannot process spiral plum blossom pipes, the present invention provides a preparation device for spiral plum blossom pipes, and the specific technical solution is as follows:

[0007] A device for preparing a spiral plum blossom tube comprises: a forming device for rolling a round tube into a plum blossom tube section; a transition device, provided on the forming device, for driving the forming device to form a transition section from the round tube to the plum blossom tube section; a drawing device, provided on one side of the forming device, for drawing the round tube; and a rotating device, provided on the drawing device, for rotating the round tube to form a spiral plum blossom tube.

[0008] Preferably, the forming device includes: a forming frame; a slide rail, which is arranged on the forming frame and connected to the transition device, and the slide rail is provided with a forming track, a first transition track and a second transition track arranged on both sides of the forming track; a retaining frame, which is slidably mounted on the forming frame and is provided with a lifting hole and a rotating hole that are interconnected; a pressure roller, which is movably inserted into the rotating hole, and the roller shaft of the pressure roller is movably inserted into the lifting hole; wherein, the roller shaft is also arranged relative to the forming track, the first transition track and the second transition track to adjust the distance between the pressure roller and the round tube, so that the round tube forms a transition section and a plum blossom tube section.

[0009] Furthermore, the forming device further comprises: a lifting bearing, which is mounted on the roller shaft and movably inserted into the lifting hole.

[0010] Furthermore, the forming device further includes: a guide assembly, which is arranged on the forming frame and connected to the retaining frame.

[0011] Furthermore, the pressing roller is symmetrically provided with arc-shaped forming grooves.

[0012] Furthermore, the transition device includes: a movable shaft, which is connected to the retaining frame and is provided with a driving external thread and a drawing hole; a driving sleeve, which is rotatably arranged on the forming frame, and the driving sleeve is movably sleeved on the movable shaft and is provided with a driving internal thread matching the driving external thread; and a driving assembly, which is connected to the driving sleeve and is used to drive the driving sleeve to rotate.

[0013] Furthermore, the driving assembly includes: a driving motor; a driving active pulley, which is arranged on the driving motor; a driving driven pulley, which is arranged on the driving sleeve; and a driving belt, which is sleeved on the driving active pulley and the driving driven pulley.

[0014] Preferably, the drawing device includes: a drawing fixed seat; a drawing movable seat, the drawing movable seat is slidably arranged on the drawing fixed seat; a drawing nut, the drawing nut is arranged on the drawing movable seat; a drawing screw rod, the drawing screw rod is rotatably arranged on the drawing fixed seat and connected to the drawing nut; and a drawing motor, the drawing motor is arranged on the drawing fixed seat and connected to the drawing screw rod.

[0015] Furthermore, the rotating device includes: a rotating shaft, which is rotatably arranged on the drawing movable seat; a three-jaw chuck, which is arranged on the rotating shaft and is used to clamp the round tube; and a rotating assembly, which is arranged on the drawing movable seat and connected to the rotating shaft.

[0016] Furthermore, the rotating assembly includes: a rotating motor, which is arranged on the pulling and moving seat; a rotating driving pulley, which is arranged on the rotating motor; a rotating driven pulley, which is arranged on the rotating shaft; and a rotating belt, which is sleeved on the rotating driving pulley and the rotating driven pulley.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention provides a preparation device for a spiral plum blossom tube, which completes the forming of a transition section and a plum blossom tube section through a transition device in cooperation with a forming device, realizes the forming of the spiral tube section through a drawing device and a rotating device, and then completes the processing of the spiral plum blossom tube with a transition section. At the same time, the structure and control are simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of this application;

[0020] Figure 2 This is a schematic diagram of the working status of this application;

[0021] Figure 3 is a cross-sectional view of the forming device along the axial direction;

[0022] Figure 4 is a cross-sectional view of the forming device along the radial direction;

[0023] Figure 5 It is a cross-sectional view of the slide rail;

[0024] Figure 6 It is the front view of the cage;

[0025] Figure 7 is a side view of the cage;

[0026] Figure 8 It is the distribution diagram of the four pressure rollers;

[0027] Figure 9 It is a structural diagram of a spiral plum blossom tube;

[0028] Figure 10 It is along Figure 9 Cross-sectional view along line AA;

[0029] Figure 11 It is a schematic diagram of the plum blossom tube section. DETAILED DESCRIPTION

[0030] The present invention will now be further described with reference to the accompanying drawings.

[0031] like Figures 1 to 8As shown, a preparation device for a spiral plum blossom tube includes a forming device 2, a transition device 3, a drawing device 4 and a rotating device 5. The rotating device 5 is installed on the drawing device 4. The drawing device 4 is arranged opposite to the forming device 2. The transition device 3 is installed on the forming device 2. The forming device 2 is used to roll a round tube into a plum blossom tube segment 11; the transition device 3 is used to drive the forming device 2 to form a transition segment 12 from the round tube to the plum blossom tube segment 11; the drawing device 4 and the rotating device 5 are used to form a spiral plum blossom tube segment.

[0032] The forming device 2 can obtain a plum blossom-shaped pipe, and the transition device 3 can drive the forming device 2 to move forward and backward, thereby completing the processing of the transition section 12, so that the forming device 2 can complete the processing of the plum blossom pipe section 11 and the transition section 12. The overall structure is simple, the cost is low, and the control is simple, and the processing is stable and reliable.

[0033] The forming device 2 includes a forming frame 21, a slide rail 22, a retaining frame 23, and a pressure roller 24. The forming frame 21 is arranged opposite the drawing device 4. The slide rail 22 is fixedly mounted inside the forming frame 21. Four slide rails 22 are arranged in a circular array. The slide rail 22 is provided with a forming track 223 and a first transition track 221 and a second transition track 222 located on either side of the forming track 223. The forming track 223 is arranged at the center of the slide rail 22. The forming track 223 is arranged horizontally, while the first transition track 221 and the second transition track 222 are arranged at an angle. The first transition track 221 and the second transition track 222 are both connected to the forming track 223 by a circular arc transition, facilitating the formation of a continuous arc-shaped transition section 12. The slide rail 22 is also provided with a sliding groove 224, which gives the slide rail 22 a U-shape. The retainer 23 is slidably mounted within the forming frame 21. The retainer 23 is provided with interconnected lifting holes 232 and rotating holes 231. The lifting holes 232 and rotating holes 231 form a cross and are arranged in a circular array. The lifting holes 232 and rotating holes 231 are both arranged opposite the slide rail 22, and the sliding groove 224 is arranged opposite the rotating holes 231. Roller shafts 241 are symmetrically provided on either side of the pressure roller 24. The pressure roller 24 is movably inserted into the rotating holes 231 and sliding groove 224. The roller shaft 241 is movably inserted into the lifting holes 232 and can be raised and lowered along the lifting holes 232. The lifting holes 232 limit the pressure roller 24 to a vertical direction. The forming rail 223, the first transition rail 221, and the second transition rail 222 are also arranged opposite the roller shaft 241 and movably abut against the roller shaft 241 to adjust the distance between the pressure roller 24 and the round tube, so that the round tube forms the transition section 12 and the plum blossom section 11.

[0034] In order to reduce the friction between the roller shaft 241 and the lifting hole 232 and increase the service life of the pressure roller 24, a lifting bearing 25 is installed on the roller shaft 241, and the lifting bearing 25 is movably inserted into the lifting hole 232. The lifting bearing 25 can convert the sliding friction during lifting into rolling friction, and also avoid the friction when the roller shaft 241 rotates.

[0035] To improve the reliability and stability of the movement of the retainer 23, the forming device 2 also includes a guide assembly 26, which is mounted on the forming frame 21 and connected to the retainer 23. The guide assembly 26 includes a guide seat 263, a guide linear guide rail 262, and a guide slider 261. The guide seat 263 is fixed inside the forming frame 21 and is provided in a circular array. The guide slider 261 is fixed to the guide seat 263, and the guide slider 261 is slidably mounted on the guide linear guide rail 262. The guide linear guide rail 262 is fixed to the guide seat 263 and arranged along the sliding direction of the retainer 23. The guide linear guide rail 262 is also connected to the retainer 23. The four guide assemblies 26 ensure that the retainer 23 is subjected to uniform force.

[0036] In order to make the outer surface of the pipe smooth, arc-shaped forming grooves 242 are symmetrically provided on the pressing roller 24. Two adjacent forming grooves 242 extrude the round pipe into a plum blossom shape.

[0037] The transition device 3 comprises a movable shaft 31, a drive sleeve 32, and a drive assembly 35. One end of the movable shaft 31 is connected to one end of the retaining frame 23 via a flange. A through-hole 311 is defined in the center of the movable shaft 31, with a diameter larger than that of the circular tube. The outer surface of the movable shaft 31 is provided with external drive threads 312. The drive sleeve 32 is rotatably mounted on the forming frame 21. To facilitate its installation, the drive sleeve 32 is connected to a drive frame 34 via a bearing. The drive frame 34 is mounted on one end of the forming frame 21. The drive sleeve 32 is movably mounted on the movable shaft 31. The interior of the drive sleeve 32 is provided with an internal drive thread that matches the external drive thread 312. The drive assembly 35 is connected to the drive sleeve 32 and is used to drive the drive sleeve 32 to rotate. The drive sleeve 32 drives the movable shaft 31 to move back and forth along its axis, causing the lifting bearing 25 to move on the forming track 223, the first transition track 221, and the second transition track 222. This in turn adjusts the distance between the pressure roller 24 and the circular tube, forming the transition section 12 and the plum blossom section 11 on the circular tube. When the lifting bearing 25 abuts against the forming track 223, the plum blossom section 11 is formed. When the lifting bearing 25 moves on the first and second transition tracks 221, 222 on either side of the forming track 223, the transition section 12 is formed.

[0038] The drive assembly 35 includes a drive motor 351, a driving pulley 352, a driven pulley 353, and a drive belt. The drive motor 351 is fixed to one end of the forming frame 21. The driving pulley 352 is mounted on the drive motor 351. The driven pulley 353 is mounted on the drive sleeve 32. The drive belt is mounted on the driving pulley 352 and the driven pulley 353. The drive motor 351 drives the drive sleeve 32 to rotate, which in turn drives the movable shaft 31 to move axially. The movable shaft 31 drives the retaining frame 23 to move forward and backward, causing the forming track 223 and the transition track to move the pressure roller 24 up and down via the lifting bearing 25.

[0039] The guide assembly 26 can also ensure the stability of the translation of the pressing roller 24 and the retaining frame 23, and ensure the symmetry of the plum blossom-shaped cross section formed when the special-shaped tube is formed.

[0040] The drawing device 4 includes a drawing fixed seat, a drawing movable seat 42, a drawing nut 43, a drawing screw rod 44 and a drawing motor 45; the drawing movable seat 42 is slidably installed on the drawing fixed seat through a linear guide pair; the drawing nut 43 is fixed to the bottom of the drawing movable seat 42 and is connected to the drawing screw rod 44, and the drawing screw rod 44 is rotatably installed on the drawing fixed seat through a bearing seat. One end of the drawing screw rod 44 is connected to the drawing motor 45 through a coupling, and the drawing motor 45 is fixed to one end of the drawing fixed seat.

[0041] The rotating device 5 includes a rotating shaft 51, a three-jaw chuck 52, and a rotating assembly 53. The rotating shaft 51 is rotatably mounted on the drawing and moving base 42 via a bearing. One end of the rotating shaft 51 is connected to the three-jaw chuck 52, which is coaxial with the moving shaft 31 and is used to clamp the round tube. The rotating assembly 53 is mounted on the drawing and moving base 42 and is also connected to the rotating shaft 51. The rotating assembly 53 includes a rotating motor 531, a rotating driving pulley 532, a rotating driven pulley 533, and a rotating belt. The rotating motor 531 is fixed to the top of the drawing and moving base 42 and is connected to the rotating driving pulley 532. The rotating driven pulley 533 is mounted on the other end of the rotating shaft 51. The rotating belt is sleeved over the rotating driving pulley 532 and the rotating driven pulley 533.

[0042] The rotating device 5 drives the formed plum blossom tube to rotate to obtain a spiral plum blossom tube. The drawing device 4 can control the pitch.

[0043] Working principle:

[0044] The round tube passes through the movable shaft 31 and the pressure roller 24 in sequence, and then the end of the round tube is clamped on the three-jaw chuck 52.

[0045] like Figure 2As shown, in the initial state, the pressing rollers 24 are both located at the lowest point of the second transition track 222 on the left side of the forming track 223 , and the distance between the two symmetrical pressing rollers 24 is greater than or equal to the outer diameter of the pipe.

[0046] The rotating motor 531 drives the round tube to rotate slowly through the three-jaw chuck 52, and the driving motor 351 drives the retaining frame 23 to move to the left through the driving sleeve 32 and the movable shaft 31. The pressure roller 24 rolls from the second transition track 222 to the forming track 223. The distance between the two symmetrical pressure rollers 24 gradually decreases, completing the transition section 12 from the round tube to the plum blossom-shaped tube. At this time, the four pressure rollers 24 are combined together to form the required plum blossom shape.

[0047] When the driving motor 351 stops, the forming track 223 is kept against the lifting bearing 25, and the drawing motor 45 is started. The drawing motor 45 drives the drawing movable seat 42 to move through the drawing screw rod 44 and the drawing nut 43, and the drawing movable seat 42 drives the three-jaw chuck 52 to move, and enters the middle section of the pipe to form the plum blossom spiral.

[0048] The three-jaw chuck 52 pulls the round tube to the right. When it is pulled to the set length, the drawing motor 45 stops and the round tube maintains the unchanged axial position. Then the driving motor 351 drives the retaining frame 23 to move to the left through the driving sleeve 32 and the movable shaft 31. The pressure roller 24 rolls from the forming track 223 to the lowest point of the first transition track 221, and the distance between the two symmetrical pressure rollers 24 gradually increases; then the driving motor 351 and the rotating motor 531 stop, completing the transition section 12 of the tube from the plum blossom tube to the round tube.

[0049] The finished spiral plum blossom tube is removed and the position of the constriction 13 is confirmed. An automatic taper reducing machine is used to reduce the conical surface. The total length is cut to the required length, and the excess length at both ends of the tube is trimmed. The surface is then visually inspected for size, cleanliness, and cleanliness before packaging.

[0050] The forming change of the transition section 12 is natural, the length of the middle section is precisely positioned, and the pitch of the spiral is controlled by the rotation speed and movement speed of the round tube.

[0051] The spiral plum blossom tube has a small outer diameter, thin wall thickness and special forming shape. The preparation device of the spiral plum blossom tube can achieve efficient production and flexible adjustment, which can effectively ensure the outer diameter wall thickness, straightness, dimensional accuracy of the deformation section and surface quality.

[0052] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are intended solely to illustrate the principles of the present invention and are not to be construed in any way as limiting the scope of protection of the present invention. Based on the explanations herein, those skilled in the art will readily devise other specific embodiments of the present invention without inventive effort, and such embodiments will fall within the scope of protection of the claims of the present invention.

Claims

1. A device for preparing a spiral plum blossom tube, characterized in that: include: A forming device (2) for rolling the round tube into a plum blossom tube section (11); A transition device (3) is provided on the forming device (2) and is used to drive the forming device (2) to form a transition section (12) that transitions from a round tube to a plum blossom tube section (11); A drawing device (4), provided on one side of the forming device (2), for drawing the round tube; and A rotating device (5) is provided on the drawing device (4) and is used to rotate the round tube to form a spiral plum blossom tube; The forming device (2) comprises: forming frame (21); A slide rail (22), the slide rail (22) being provided on the forming frame (21) and connected to the transition device (3), the slide rail (22) being provided with a forming rail (223), a first transition rail (221) and a second transition rail (222) provided on both sides of the forming rail (223); A retaining frame (23), the retaining frame (23) is slidably mounted on the forming frame (21) and is provided with a lifting hole (232) and a rotating hole (231) that communicate with each other; A pressure roller (24), wherein the pressure roller (24) is movably inserted into the rotating hole (231), and a roller shaft (241) of the pressure roller (24) is movably inserted into the lifting hole (232); The roller (241) is also arranged relative to the forming track (223), the first transition track (221) and the second transition track (222) to adjust the distance between the pressing roller (24) and the round tube so that the round tube forms a transition section (12) and a plum blossom section (11); The pressing roller (24) is symmetrically provided with arc-shaped forming grooves (242); The transition device (3) comprises: A movable shaft (31), the movable shaft (31) being connected to the retaining frame (23) and provided with a driving external thread (312) and a drawing through hole (311); A driving sleeve (32), the driving sleeve (32) being rotatably mounted on the forming frame (21), the driving sleeve (32) being movably mounted on the movable shaft (31), and being provided with a driving internal thread matching the driving external thread (312); and a driving assembly (35), the driving assembly (35) being connected to the driving sleeve (32) and being used to drive the driving sleeve (32) to rotate; The pulling device (4) comprises: Pull out the fixed seat; A pulling movable seat (42), wherein the pulling movable seat (42) is slidably arranged on the pulling fixed seat; A pulling nut (43), the pulling nut (43) being arranged on the pulling movable seat (42); A drawing screw rod (44), the drawing screw rod (44) is rotatably mounted on the drawing fixing seat and is connected to the drawing nut (43); and A drawing motor (45), the drawing motor (45) being arranged on the drawing fixing seat and connected to the drawing screw rod (44); The driving motor drives the retaining frame to move to the left through the driving sleeve and the movable shaft. The pressing roller rolls from the second transition track to the forming track. The distance between the two symmetrical pressing rollers gradually decreases, completing the transition section from the round tube to the plum blossom tube.

2. The device for preparing a spiral plum blossom tube according to claim 1, characterized in that: The forming device (2) further comprises: a lifting bearing (25), wherein the lifting bearing (25) is mounted on the roller shaft (241) and is movably inserted into the lifting hole (232).

3. The device for preparing a spiral plum blossom tube according to claim 1, characterized in that: The forming device (2) further comprises: a guide assembly (26), wherein the guide assembly (26) is provided on the forming frame (21) and connected to the retaining frame (23).

4. The device for preparing a spiral plum blossom tube according to claim 1, characterized in that: The drive assembly (35) comprises: Drive motor (351); A driving pulley (352), wherein the driving pulley (352) is provided on the driving motor (351); A driven pulley (353), the driven pulley (353) being provided on the driving sleeve (32); and A driving belt is sleeved on the driving active pulley (352) and the driven driving pulley (353).

5. The device for preparing a spiral plum blossom tube according to claim 1, characterized in that: The rotating device (5) comprises: A rotating shaft (51), the rotating shaft (51) being rotatably mounted on the pulling movable seat (42); a three-jaw chuck (52), the three-jaw chuck (52) being arranged on the rotating shaft (51) and being used for clamping the round tube; and A rotating assembly (53) is provided on the pulling movable seat (42) and is connected to the rotating shaft (51).

6. The device for preparing a spiral plum blossom tube according to claim 5, characterized in that: The rotating assembly (53) comprises: A rotating motor (531), the rotating motor (531) being arranged on the pulling movable seat (42); A rotating driving pulley (532), wherein the rotating driving pulley (532) is provided on the rotating motor (531); a rotating driven pulley (533), wherein the rotating driven pulley (533) is provided on the rotating shaft (51); and A rotating belt is sleeved on the rotating driving pulley (532) and the rotating driven pulley (533).

Images