Reducing drawing machining device for small-diameter pipe

Abstract

The invention relates to the technical field of pipe machining, in particular to a thin-diameter pipe reducing drawing machining device which comprises a rack, a rolling unit and a lifting unit, the rolling unit and the lifting unit are arranged on the rack and oppositely distributed, and a thin-diameter pipe is spirally wound on the rolling unit. The rolling unit comprises two first transmission columns which are oppositely distributed and a first extrusion belt which is arranged on the two first transmission columns in a transmission mode. By means of the pipe rolling and lifting device, the problem that pipes and molds are abraded when the pipes are machined in a traditional mode is effectively solved, the pipes between the rolling unit and the lifting unit are rolled, the continuous and active conveying function of the pipes can be achieved, continuous production of the pipes is achieved, and production efficiency is improved. And meanwhile, both the rolling unit and the lifting unit can be in surface contact with the pipe, so that the deformed pipe can be extruded and shaped within specified time.

Description

Technical Field

[0001] This invention relates to the field of pipe processing technology, and in particular to a small-diameter pipe diameter reduction drawing processing device. Background Technology

[0002] Small-diameter tubes are copper or aluminum tubing with a small inner diameter. They are widely used in high-end fields such as micro heat exchangers, precision instrument conduits, medical device interventional components, and cooling pipes for microelectronic devices. Their dimensional accuracy, inner wall integrity, and mechanical properties directly determine the reliability and lifespan of the end products. To meet the diverse needs under complex working conditions, the tubes often need to undergo diameter reduction drawing processing.

[0003] In the plastic forming of this type of pipe, variable diameter drawing is the core forming process. The traditional method mainly relies on hard drawing technology, which forces the pipe through a series of drawing dies with fixed and progressively decreasing apertures at room temperature. During this process, the pipe diameter decreases and the wall thickness also changes, thereby achieving precise control of geometric dimensions. However, this process has significant drawbacks: First, due to the significant work hardening effect and high deformation resistance, it is a typical case of strong deformation hard drawing, which causes the working area of ​​the die to be subjected to extremely high contact stress and frictional heat, accelerating die wear, reducing its service life, and affecting the dimensional consistency during mass production. Second, for the pipe itself, the severe plastic deformation can easily accumulate excessive residual stress inside the material, leading to uneven texture in the microstructure. More seriously, in areas with poor deformation coordination, especially the inner surface layer, microscopic defects such as tearing or microcracks are easily induced, resulting in pipe damage. Summary of the Invention

[0004] This invention provides a small-diameter tube diameter changing drawing device, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A small-diameter tube diameter changing drawing processing device includes a frame, a rolling unit and a lifting unit disposed on the frame and distributed opposite to each other. The small-diameter tube is spirally wound on the rolling unit. The rolling unit includes two oppositely distributed drive columns and a compression belt disposed on the two drive columns. The lifting unit includes two oppositely distributed drive columns and a plurality of compression belts disposed on the two drive columns. The outer circumferential wall of the second transmission column is configured as a plurality of steps arranged along the axial direction of the second transmission column. The second extrusion belt is driven and sleeved on the corresponding steps. The surface of the first extrusion belt facing the lifting unit is parallel to the surface of the second extrusion belt facing the rolling unit. Along the axial direction of the second transmission column, the distance between the first extrusion belt and each of the second extrusion belts gradually increases or decreases. The axis of the second transmission column is coplanar with the axis of the first transmission column, and the second transmission column reciprocates along its own axis.

[0006] Furthermore, the first transmission column is tapered, and the first extrusion belt is used in conjunction with the first transmission column.

[0007] Furthermore, the rolling unit also includes a plurality of limiting wheels arranged linearly on the surface of the extrusion belt away from the lifting unit, and the limiting wheels are inclined relative to the conveying direction of the extrusion belt.

[0008] Furthermore, a recessed area is provided on the surface of the compression belt away from the lifting unit, and the depth of the recessed area gradually increases along the conical direction of the transmission column. The limiting wheel is used in conjunction with the recessed area.

[0009] Furthermore, a pressure pad structure is provided in both the first extrusion belt and each of the second extrusion belts.

[0010] Furthermore, the pressure pad structure includes a support body, two side plates disposed at both ends of the support body, annular grooves formed on each of the side plates, and a plurality of sliding columns slidably disposed in the annular grooves. A plurality of pads arranged around the support body are disposed between the two side plates, and the pads are connected to the corresponding sliding columns through connecting frames. A number of pads that are in contact with the inner wall of the first extrusion belt or the inner wall of the second extrusion belt move in a translational motion along the conveying direction of the first extrusion belt or the second extrusion belt.

[0011] Furthermore, the transmission column two is composed of several coaxially arranged rollers, and the diameter of the rollers gradually increases or decreases along their arrangement direction. A spindle is inserted through the middle of the rollers, one roller is fixed relative to the spindle, and the remaining rollers rotate relative to the spindle. A power unit is provided on the second transmission column to provide power for the rotation and reciprocating motion of the second transmission column.

[0012] Furthermore, the power unit includes a support shaft that slides through the spindle and a driving gear and a driven gear that cooperate with each other. The support shaft is rotatably mounted on the frame, the driven gear is fixed relative to the support shaft, and a pawl is eccentrically provided on the end face of the driving gear. A fixed seat is provided on the mandrel, and the fixed seat rotates relative to the mandrel. The end face of the fixed seat is in contact with the end face of the drive gear and slides relative to it. A long groove perpendicular to the axis of the mandrel is opened on the end face of the fixed seat, and the push pin is slidably installed in the long groove.

[0013] Furthermore, a plurality of guide bodies are arranged on the frame along the generatrix of the outer wall of the transmission column, and the guide bodies guide the small diameter tube wound on the extrusion belt.

[0014] Furthermore, the guide body is a rotating column, and the outer wall of the rotating column is provided with several spiral patterns; A slide block is slidably mounted on the frame, and each of the rotating columns is rotatably mounted on the slide block. The slide block and the fixed base are rotatably connected by a push-pull arm.

[0015] The technical solution of this invention can achieve the following technical effects: This method effectively solves the wear problem of pipes and molds during traditional pipe processing. By using a rolling unit and a lifting unit to roll the pipes, continuous and active pipe conveying can be achieved, enabling continuous pipe production. The rolling and lifting units are designed to make surface contact with the pipes, allowing for a specified time of compression and shaping of the deformed pipes. Combined with the reciprocating motion of the lifting unit perpendicular to the pipe conveying direction, the rolling and lifting units repeatedly roll and knead the pipes while in surface contact, ensuring that the pipes are compressed and deformed in the circumferential direction. This improves the uniformity and compactness of the pipes, prevents uneven internal structure or cracks, and enhances the quality of pipe processing.

[0016] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of a small-diameter tube diameter changing drawing device; Figure 2 for Figure 1 A schematic diagram of the internal structure of the mid-frame; Figure 3 for Figure 2 A schematic diagram of the exploded structure; Figure 4 for Figure 3 Schematic diagram of the intermediate rolling unit; Figure 5 for Figure 4 A structural diagram from another perspective; Figure 6 for Figure 5 A schematic diagram of the intermediate pressure pad structure; Figure 7 for Figure 6 Schematic diagram of cross-section structure; Figure 8 for Figure 3 Schematic diagram of the second transmission column and its upper structure; Figure 9 for Figure 8 A schematic diagram of the enlarged structure of the power unit; Attached reference numerals: 100, rack; 200. Rolling unit; 201. Transmission column 1; 202. Extrusion belt 1; 203. Limiting wheel; 204. Recessed area; 205. Pressure pad structure; 206. Support body; 207. Side plate; 208. Annular groove; 209. Sliding column; 210. Pad plate; 211. Connecting frame; 300. Lifting unit; 301. Transmission column two; 302. Extrusion belt two; 303. Mandrel; 304. Power unit; 305. Support shaft; 306. Drive gear; 307. Driven gear; 308. Pulley; 309. Fixing seat; 310. Long groove; 400, guide body; 401, slide block; 402, push-pull arm. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0021] like Figures 1 to 4As shown, this application provides a small-diameter tube diameter changing drawing processing device, including a frame 100, a rolling unit 200 and a lifting unit 300 disposed on the frame 100 and distributed opposite to each other. The small-diameter tube is spirally wound on the rolling unit 200. The rolling unit 200 includes two oppositely distributed drive columns 201 and extrusion belts 202 driven on the two drive columns 201. The lifting unit 300 includes two oppositely distributed drive columns 301 and a plurality of extrusion belts 302 driven on the two drive columns 301. The outer circumferential wall of the transmission column 2 301 is configured as several steps arranged along the axis of the transmission column 2 301. The extrusion belt 2 302 is sleeved on the corresponding step. The surface of the extrusion belt 1 202 facing the lifting unit 300 is parallel to the surface of the extrusion belt 2 302 facing the rolling unit 200. Along the axis of the transmission column 2 301, the distance between the extrusion belt 1 202 and each extrusion belt 2 302 gradually increases or decreases. The axis of transmission column 2 301 is coplanar with the axis of transmission column 1 201, and transmission column 2 301 reciprocates along its own axis.

[0022] Specifically, the frame 100 provides support for the rolling unit 200 and the lifting unit 300, which are distributed opposite to each other. A gap between the rolling unit 200 and the lifting unit 300 is used for inserting tubing. By utilizing the relative rolling of the rolling unit 200 and the compression of the tubing by the lifting unit 300, the diameter of the tubing can be changed. Since the tubing can be spirally wound on the rolling unit 200, the tubing can be processed in multiple passes between the rolling unit 200 and the lifting unit 300. Rolling treatment gradually reduces the diameter of the pipe. To achieve this, the gap between the rolling unit 200 and the supporting unit 300 can be set into a conical shape. The pipe with the spiral winding is continuously processed by gradually changing the width of the conical gap. The rolling unit 200 and the supporting unit 300 can be distributed horizontally or vertically, as long as the gap between them can be used to process the pipe. The extrusion strip 202 and the extrusion strip 302 can be steel strips or other structures with certain hardness and variability.

[0023] The way the extrusion belt 202 is driven on the two drive columns 201 and the way the extrusion belt 302 is driven on the two drive columns 301 allows both the rolling unit 200 and the lifting unit 300 to have surface contact with the pipe. That is, in the pipe conveying direction, both the rolling unit 200 and the lifting unit 300 can have a large and long contact area with the pipe. However, if the rolling unit 200 and the lifting unit 300 only adopt a roller structure, then the contact between the pipe and the rolling unit 200 and the lifting unit 300 can only be a line contact. The contact area is small, the stress is more concentrated, and it is impossible to achieve the effect of maintaining pressure and shaping the pipe after deformation.

[0024] The stepped arrangement of the transmission column 2 301 allows for different gaps between the extrusion belts 2 302 and 202, thus allowing pipes of different specifications to pass through. Since the lifting unit 300 can reciprocate, when the pipe is rolled and conveyed between the extrusion belts 202 and 302, the reciprocating direction of the extrusion belts 2 302 is perpendicular to the pipe conveying direction. At this time, the extrusion belts 202 and 302 can work together to roll the outer circumference of the pipe, thereby making the roundness of the outer wall of the pipe more uniform. However, if only the conveying method of the extrusion belts 202 and 302 is used to extrude the pipe, it may flatten the pipe and fail to keep it in a tubular shape.

[0025] In use, the extrusion belt 202 and several extrusion belts 302 move synchronously. One end of the pipe is inserted between the extrusion belt 302 with the largest gap and the extrusion belt 202. The rotational movement of the extrusion belts 302 and 202 extrusion belts 202 extrudes the pipe and continuously conveys it, reducing the pipe diameter. At the same time, the reciprocating motion of the lifting unit 300 causes the extrusion belts 302 to move synchronously, pressing the pipe against the extrusion belts 202 and kneading it back and forth. This allows the deformation of the pipe to cover its circumference. At all locations on the outer wall, the pipe undergoes extrusion and diameter reduction processing along its conveying direction, as well as kneading and diameter reduction processing through the cooperation of extrusion belt 202 and extrusion belt 302. This results in a more uniform and solidified surface and interior of the pipe. After one processing step, the pipe passes around extrusion belt 202 and then through the gap between adjacent extrusion belt 302 and extrusion belt 202. This process is repeated, and by gradually increasing or decreasing the gap between extrusion belt 202 and extrusion belt 202, the diameter of the pipe gradually decreases, thus achieving the diameter reduction and drawing processing of the pipe.

[0026] The technical solution of this invention effectively solves the wear problem of pipes and molds during traditional pipe processing. By using the rolling unit 200 and the lifting unit 300 to roll the pipes between them, continuous and active pipe conveying can be achieved, enabling continuous pipe production. At the same time, the setting of the rolling unit 200 and the lifting unit 300 to make surface contact with the pipes allows for the compression and shaping of the deformed pipes for a specified time. With the reciprocating motion of the lifting unit 300 along the direction perpendicular to the pipe conveying, the rolling unit 200 and the lifting unit 300 reciprocate and roll the pipes while in surface contact with them, so that the pipes can be compressed and deformed in the circumferential direction, improving the uniformity and solidification of the pipes, avoiding uneven structure or cracks inside the pipes, and improving the quality of pipe processing.

[0027] Furthermore, such as Figure 4 As shown, the transmission column 201 is tapered, and the extrusion belt 202 is used in conjunction with the transmission column 201.

[0028] The tapered design of the transmission column 201 allows the overall shape of the extrusion belt 202 to also be tapered. Along the rotation axis of the extrusion belt 202, the outer diameter of the extrusion belt 202 gradually increases or decreases. When the tube is spirally wound on the extrusion belt 202, with the continuous conveying of the tube and the continuous movement of the extrusion belt 202, the extrusion belt 202 expands the tube round by round. That is, by utilizing the shape characteristics of the extrusion belt 202 itself, the tube can be drawn and lengthened as it moves along the rotation axis of the extrusion belt 202. This diameter change method can be combined with the extrusion belt 202 and the limiting wheel 203 to extrude and knead the tube to change its diameter, thereby realizing a multi-functional diameter change and drawing process for the tube.

[0029] Furthermore, the rolling unit 200 also includes a plurality of limiting wheels 203 arranged linearly on the surface of the extrusion belt 202 away from the lifting unit 300, and the limiting wheels 203 are inclined relative to the conveying direction of the extrusion belt 202.

[0030] like Figure 5 As shown, two drive columns 201 support the extrusion belt 202. Due to the tapered characteristics of the drive columns 201 and the extrusion belt 202, the extrusion belt 202 is prone to detaching from the drive columns 201, causing the rolling unit 200 to malfunction. Utilizing the extrusion belt 202 being squeezed by several limiting wheels 203 and the inclined arrangement of the limiting wheels 203, when the extrusion belt 202 drives the limiting wheels 203 to rotate, the friction between the limiting wheels 203 and the extrusion belt 202 provides a force to the extrusion belt 202 towards the end with the larger diameter of the drive columns 201, thereby ensuring that the extrusion belt 202 can run stably on the drive columns 201. The limiting wheels 203 are rotatably mounted on the frame 100.

[0031] Furthermore, such as Figure 5 As shown, a recessed area 204 is provided on the surface of the compression belt 202 away from the lifting unit 300, and the depth of the recessed area 204 gradually increases along the conical direction of the transmission column 201. The limiting wheel 203 is used in conjunction with the recessed area 204.

[0032] Since the depth of the recessed area 204 gradually increases along the conical direction of the transmission column 201, the straight line formed by several limiting wheels 203 can provide lateral thrust to the extrusion belt 202. The direction of this lateral thrust is towards the end of the transmission column 201 with a larger diameter. Thus, the locking function of the extrusion belt 202 is realized by several limiting wheels 203 and the recessed area 204, thereby improving the running stability of the extrusion belt 202.

[0033] Furthermore, pressure pad structures 205 are provided in both the first extrusion belt 202 and each second extrusion belt 302.

[0034] Since both extrusion belt 202 and extrusion belt 302 have a certain degree of elasticity, they are prone to deformation when they extrude the pipe, which reduces their effectiveness in extruding the pipe. However, by using several pressure pad structures 205, the working surfaces of extrusion belt 202 and extrusion belt 302 can be kept flat and undeformed, making the extrusion of the pipe by extrusion belt 202 and extrusion belt 302 more direct and effective.

[0035] Furthermore, such as Figure 6 and Figure 7 As shown, the pressure pad structure 205 includes a support body 206, two side plates 207 disposed at both ends of the support body 206, annular grooves 208 formed on each side plate 207, and a plurality of sliding columns 209 slidably disposed in the annular grooves 208. A plurality of pads 210 arranged around the support body 206 are disposed between the two side plates 207, and the pads 210 are connected to the corresponding sliding columns 209 through connecting frames 211. Several pads 210 that are in contact with the inner wall of extrusion belt 202 or extrusion belt 302 move in a translational direction along the conveying direction of extrusion belt 202 or extrusion belt 302.

[0036] Because the working surfaces of extrusion belt 1 202 and extrusion belt 2 302 need to have a certain strength, the contact position between the pressure pad structure 205 and extrusion belt 1 202 and extrusion belt 2 302 needs to always be planar. That is, the pads 210 in the pressure pad structure 205 that contact extrusion belt 1 202 and extrusion belt 2 302 need to be coplanar. When extrusion belt 1 202 or extrusion belt 2 302 is driven, the friction force can be used to make several pads 210 move in a circular motion around the support body 206. The several pads 210 that contact extrusion belt 1 202 or extrusion belt 2 302 can provide planar support for extrusion belt 1 202 or extrusion belt 2 302. Since the pads 210 can move synchronously, the friction between the pads 210 and extrusion belt 1 202 and extrusion belt 2 302 is small. The pads 210 can drive the sliding column 209 to slide in the annular groove 208 through the connecting frame 211. The support body 206 can provide support for the side plate 207 and its structure.

[0037] When the extrusion belt 202 is in transmission, its shape characteristics will cause different linear velocities at different positions on it. Since the pad 210 can also move, the extrusion belt 202 and the pad 210 will come into contact with each other and generate small relative friction.

[0038] Furthermore, such as Figure 8 As shown, the transmission column 301 is composed of several rollers arranged coaxially, and the diameter of the rollers gradually increases or decreases along their arrangement direction. A spindle 303 is inserted in the middle of the rollers. One roller is fixed relative to the spindle 303, and the remaining rollers rotate relative to the spindle 303. A power unit 304 is provided on the transmission column 301 to provide power for the rotation and reciprocating motion of the transmission column 301.

[0039] Several rollers on the spindle 303 contact each other and move relative to each other in sequence. Since the linear velocity of different positions on the extrusion belt 202 is different, the linear velocity of the extrusion belts 302 is also different. The extrusion belts 302 drive different rollers to perform differential motion, so as to avoid the speed difference causing some of the extrusion belts 302 and the transmission column 301 to rub and slide relative to each other when the transmission column 301 is a whole structure. The gradual change in the diameter of the rollers can facilitate the formation of a gradually changing gap between the lifting unit 300 and the rolling unit 200.

[0040] The power unit 304 can drive the mandrel 303 and one of its rollers to rotate. The friction between the roller and the tube can then drive the rolling unit 200 to move. The rolling unit 200 then drives the remaining rollers on the mandrel 303 to move in the opposite direction. Alternatively, the rolling unit 200 can be used as the active source to drive several mandrels 303 and several extrusion belts 302 to move. In this case, the power unit 304 only needs to provide reciprocating motion power to the transmission column 301.

[0041] Furthermore, the power unit 304 includes a support shaft 305 that slides through the spindle 303 and a drive gear 306 and a driven gear 307 that cooperate with each other. The support shaft 305 is rotatably mounted on the frame 100. The driven gear 307 is fixed relative to the support shaft 305. A pawl 308 is eccentrically provided on the end face of the drive gear 306. A fixed seat 309 is provided on the spindle 303, and the fixed seat 309 rotates relative to the spindle 303. The end face of the fixed seat 309 is in contact with the end face of the drive gear 306 and slides relative to each other. A long groove 310 perpendicular to the axis of the spindle 303 is provided on the end face of the fixed seat 309, and the push pin 308 is slidably installed in the long groove 310.

[0042] like Figure 9 As shown, the end face of the drive gear 306 can limit the fixed seat 309, preventing it from rotating with the spindle 303. The drive gear 306 can be driven by an external motor. When the drive gear 306 rotates, it can drive the support shaft 305 to rotate through the driven gear 307. The support shaft 305 then drives the spindle 303 to rotate, thereby driving the transmission column 301 and the extrusion belt 302 to run. At the same time, the rotation of the drive gear 306 can drive the fixed seat 309 to reciprocate through the long slot 310 and the lever 308. The fixed seat 309 pushes the spindle 303 to reciprocate on the support shaft 305, thereby providing power for the reciprocating motion of the transmission column 301.

[0043] In some embodiments, the power unit 304 may be provided on only one transmission column 301, or the power unit 304 may be provided on both transmission columns 301.

[0044] Furthermore, a number of guide bodies 400 are arranged on the frame 100 along the generatrix of the outer wall of the transmission column 201, and the guide bodies 400 guide the small diameter tube wound on the extrusion belt 202.

[0045] Since the pipe is spirally wound on the rolling unit 200 and the extrusion belt 202 is conical, it is necessary to prevent the pipe from moving in the opposite direction when it moves from the smaller diameter end to the larger diameter end on the extrusion belt 202. This can be achieved by using several guides 400 to block and guide each turn of the pipe on the extrusion belt 202, thereby allowing the pipe to gradually expand using the extrusion belt 202 and ensuring that the pipe can be transported in a spiral shape. To improve the stability of the pipe transport, several guides 400 can be configured on each transmission column 201.

[0046] Furthermore, such as Figure 3 and Figure 8 As shown, the guide body 400 is a rotating column, and several spiral patterns are provided on the outer wall of the rotating column; A slide block 401 is slidably mounted on the frame 100, and each rotating column is rotatably mounted on the slide block 401. The slide block 401 and the fixed seat 309 are rotatably connected by a push-pull arm 402.

[0047] When the pipe is being transported, it drives the rotating column to rotate. The rotating column uses several spiral patterns to provide an upward tumbling force for the pipe. Thus, while the rolling unit 200 and the lifting unit 300 are kneading the pipe, several rotating columns on the other side of the rolling unit 200 can help push the pipe at the corresponding position to tumble as well, preventing the pipe from easily twisting and tearing when it only tumbles on one side of the rolling unit 200.

[0048] When the fixed seat 309 moves back and forth, it will drive the slide 401 and several rotating columns on it to move synchronously through the push-pull arm 402. This facilitates the expansion and change of the diameter of the pipe on the extrusion belt 202, and makes it easy for each ring of pipe on the extrusion belt 202 to roll smoothly.

[0049] Although this application has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made thereto without departing from the spirit and scope of this application. Accordingly, this specification and drawings are merely exemplary illustrations of the application as defined herein, and are to be considered as covering any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from its scope. Thus, if such modifications and modifications fall within the scope of this application and its equivalents, this application intends to include such modifications and modifications.

Claims

1. A reducing drawing device for reducing a fine diameter tube, characterized by comprising: The device comprises a rack, a rolling unit and a lifting unit arranged on the rack and oppositely distributed, a fine tube is spirally wound on the rolling unit, the rolling unit comprises two transmission columns I and extrusion belts I arranged on the two transmission columns I, the lifting unit comprises two transmission columns II arranged oppositely and a plurality of extrusion belts II arranged on the two transmission columns II. The circumferential outer wall of the transmission column II is arranged as a plurality of steps arranged along the axis direction of the transmission column II, the extrusion belts II are arranged on the corresponding steps, the surface of the extrusion belts I facing the lifting unit is parallel to the surface of the extrusion belts II facing the rolling unit, and the distance between the extrusion belts I and each extrusion belt II gradually increases or decreases along the axis direction of the transmission column II. The axis of the transmission column II is coplanar with the axis of the transmission column I, and the transmission column II reciprocates along the axis direction of itself.

2. The reducing drawing device for a small diameter tube according to claim 1, wherein The transmission column I is in the shape of a cone, and the extrusion belts I are used in cooperation with the transmission column I.

3. The reducing drawing device for a small diameter tube according to claim 2, wherein The rolling unit further comprises a plurality of limiting wheels arranged linearly on the surface of the extrusion belts I away from the lifting unit, and the limiting wheels are arranged obliquely relative to the conveying direction of the extrusion belts I.

4. The reducing drawing device for a small diameter tube according to claim 3, wherein The surface of the extrusion belts I away from the lifting unit is provided with a recessed area, and the depth of the recessed area gradually increases along the conical direction of the transmission column I, and the limiting wheels are used in cooperation with the recessed area.

5. The device according to claim 1, wherein A pressure pad structure is arranged in the extrusion belts I and each extrusion belt II.

6. The reducing drawing device for a small diameter tube according to claim 5, wherein The pressure pad structure comprises a support body, two side discs arranged at both ends of the support body, a ring groove opened on each side disc, and a plurality of slide columns slidingly arranged in the ring groove, a plurality of pad plates arranged around the support body are arranged between the two side discs, and the pad plates are connected with the corresponding slide columns through a connecting frame. A plurality of pad plates attached to the inner wall of the extrusion belts I or the inner wall of the extrusion belts II translate along the conveying direction of the extrusion belts I or the extrusion belts II.

7. The reducing drawing device for a small diameter tube according to claim 2, wherein The transmission column II is composed of a plurality of rollers arranged coaxially, the diameters of a plurality of the rollers gradually increase or decrease along the arrangement direction, a plurality of the rollers are inserted with a mandrel, one of the rollers is fixed relative to the mandrel, and the remaining rollers rotate relative to the mandrel. A power unit is arranged on the transmission column II to provide power for the rotation and reciprocating movement of the transmission column II.

8. The reducing drawing device for a small diameter tube according to claim 7, wherein The power unit comprises a support shaft sliding through the mandrel and a driving gear and a driven gear used in cooperation, the support shaft is rotationally arranged on the rack, the driven gear is fixed relative to the support shaft, and an eccentricity is arranged on the end surface of the driving gear. A fixing seat is arranged on the mandrel, the fixing seat rotates relative to the mandrel, the end surface of the fixing seat is attached to and slides relative to the end surface of the driving gear, a long slot perpendicular to the axis of the mandrel is opened on the end surface of the fixing seat, and the push rod is slidingly installed in the long slot.

9. The reducing drawing device for a small diameter tube according to claim 8, wherein A plurality of guide bodies are arranged on the rack along the generatrix direction of the outer wall of the transmission column I, and the guide bodies guide the fine tube wound on the extrusion belts I.

10. The reducing drawing device for a small diameter tube according to claim 9, wherein The guide body is a rotating column, and a plurality of helical threads are arranged on the outer wall of the rotating column; A sliding seat is arranged on the frame, and each rotating column is rotationally arranged on the sliding seat. The sliding seat and the fixed seat are rotationally connected through a push-pull arm.

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