A continuous drawing processing device and method for internal thread copper pipe

Abstract

The present application relates to copper pipe processing technical field, especially to a kind of inner thread copper pipe continuous drawing processing equipment and method, including outer ring and the inner column located in the inner side of the outer ring, the axis of the outer ring with the axis of the inner column parallel and mutually deviate, along the circumferential direction of the outer ring, the shortest vertical connecting line between the inner wall of the outer ring and the outer wall of the inner column two sides is extrusion zone and release area respectively, the extrusion zone is used to extrude copper pipe and make it change diameter.By the present application, effectively solve the drawback that traditional hard drawing cannot be continuously produced, so that copper pipe can be continuously fed into outer ring and extruded through extrusion zone between outer ring and inner column, improve work efficiency, while using outer ring and inner column cooperate to roll copper pipe The operation mode of pressure can effectively reduce the friction damage to the surface of copper pipe, improve the surface quality of copper pipe, and the rolling mode can make the deformation of copper pipe more uniform, avoid copper pipe tearing.

Description

Technical Field

[0001] This invention relates to the field of copper tube processing technology, and in particular to a continuous drawing processing equipment and method for internally threaded copper tubes. Background Technology

[0002] Copper tubes are widely used in key industrial fields such as refrigeration, HVAC, power and aerospace due to their excellent thermal conductivity, corrosion resistance and plasticity. With the upgrading of related industries, the market has put forward increasingly stringent requirements for the dimensional accuracy, surface quality, mechanical properties, production efficiency and cost of copper tubes.

[0003] Currently, traditional drawing technology still dominates the finishing process of copper tubes. This process mainly uses a fixed drawing machine, which uses clamps to force the copper tube through the drawing hole on the drawing die to achieve plastic deformation that reduces its outer diameter and adjusts its wall thickness. However, this "hard drawing" method has a series of inherent drawbacks: First, the production process is intermittent, with a limited length drawn each time, requiring frequent loading, clamping, die-through, and unloading operations, resulting in low production efficiency and difficulty in meeting the needs of large-scale continuous production; Second, the large deformation of a single drawing causes severe wear on the die and easily produces defects such as scratches and vibration marks on the surface of the copper tube, which restricts the improvement of product yield. Summary of the Invention

[0004] This invention provides a continuous drawing equipment and method for internally threaded copper tubes, 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:

[0006] A continuous drawing processing device for internally threaded copper tubes includes an outer ring and an inner column located inside the outer ring. The axis of the outer ring is parallel to and offset from the axis of the inner column. Along the circumferential direction of the outer ring, the two sides of the shortest vertical line between the inner wall of the outer ring and the outer wall of the inner column are respectively a pressing zone and a release zone. The pressing zone is used to press the copper tube and change its diameter.

[0007] Several annular grooves 1 and several annular grooves 2 are provided on the outer wall of the outer ring and the outer wall of the inner column. The annular grooves 1 and 2 are used in conjunction. Along the axial direction of the outer ring, the diameter of the groove cross section of each annular groove 1 and the diameter of the groove cross section of each annular groove 2 gradually increases or decreases.

[0008] Furthermore, the copper tube is rolled between corresponding annular groove one and annular groove two to change its diameter, or it is rolled in a spiral shape between several annular groove one and several annular groove two to change its diameter.

[0009] Furthermore, the outer ring is composed of several coaxially arranged splicing rings, and several ring grooves are distributed one-to-one on the inner wall of several splicing rings;

[0010] The inner column is composed of several coaxially arranged splicing disks, and several annular grooves are correspondingly distributed on the inner wall of several splicing disks;

[0011] A plurality of splicing rings and a plurality of splicing disks are correspondingly arranged, and the plurality of splicing rings and the plurality of splicing disks are divided into two groups, and the distance between the two groups can be adjusted.

[0012] Furthermore, several baffles are provided in both the extrusion zone and the release zone, and the baffles are located between two adjacent annular grooves or two annular grooves.

[0013] Furthermore, a slot 1 and a slot 2 are respectively provided between two adjacent annular grooves 1 and between two adjacent annular grooves 2, and part of the baffle slides within the slot 1 and the slot 2;

[0014] Guide posts are provided in both the compression zone and the release zone, and the baffle is slidably mounted on the guide posts along the outer ring axis.

[0015] Furthermore, a support group is provided between the outer ring and the inner column, the support group including a plurality of support columns corresponding to each of the first ring grooves or each of the second ring grooves.

[0016] Furthermore, the axis of the support column is perpendicular to the axis of the outer ring, and along the direction of the outer ring axis, the support column is located between two adjacent ring grooves.

[0017] Furthermore, the support assembly also includes two opposing side plates, each of which has several support platforms slidably arranged along the outer ring axis. A side wheel is rotatably arranged on the support platform, and the end of the support column is connected to the side wheel. A support sleeve is rotatably sleeved on the outer wall of the side wheel, and a sliding piece is provided on the support sleeve. Part of the sliding piece is slidably inserted into the first slot or the second slot.

[0018] Furthermore, the processing equipment also includes a machine base, on which two relatively distributed vertical plates and a push-pull structure are provided. Each of the splicing rings is provided with an adjusting sleeve, the position of which is adjustable on the vertical plate.

[0019] The output end of the push-pull structure is provided with a bracket, the bracket is provided with a motor, the output end of the motor is provided with a prism shaft, the inner column is coaxially provided on the prism shaft and can slide on the prism shaft, and the deviation between the inner column and the outer ring can be adjusted by the push-pull structure.

[0020] A method for continuous drawing of internally threaded copper tubes includes the following steps:

[0021] Adjust the position of the inner column within the outer ring so that the deviation between the inner column and the outer ring conforms to the specifications of the pre-processed copper tube;

[0022] Divide several annular grooves into two groups, and form a group with an annular groove that meets the specifications for copper tube output and several annular grooves with a smaller cross-sectional diameter than the groove on the annular groove. Several annular grooves are set in correspondence with several annular grooves.

[0023] Rotate the inner column to pass the end of the copper rod through the larger diameter of the groove cross section between the first and second annular grooves in the set. The inner column squeezes the copper tube and uses the copper tube to drive the outer ring to rotate synchronously. The squeezing area corresponding to the first and second annular grooves performs a squeezing and diameter reduction process on the copper tube.

[0024] Then, the copper rod is made to wrap around the inner column in the outer ring and pass through the adjacent ring groove and splicing ring again. The copper tube is subjected to a second extrusion and diameter reduction process. This process is repeated so that the copper tube is spirally extruded and reduced in diameter multiple times.

[0025] After undergoing multiple diameter changes, the end of the copper tube passes through the annular groove and splicing ring in another set that meet the copper tube output specifications. The copper tube that is then output is the finished copper tube.

[0026] The technical solution of this invention can achieve the following technical effects:

[0027] This method effectively solves the drawback of continuous production during traditional hard drawing, allowing copper tubes to be continuously fed into the outer ring and undergo extrusion and diameter reduction in the extrusion zone between the outer ring and the inner column, thus improving work efficiency. Simultaneously, the rolling operation using the outer ring and inner column effectively reduces frictional damage to the copper tube surface, improving surface quality. Furthermore, this rolling method ensures more uniform deformation of the copper tube, preventing tearing. Due to the relatively eccentric arrangement of the outer ring and inner column, the width of the extrusion zone gradually decreases, and the extrusion zone has a longer extrusion path, thereby reducing the amount of deformation of the copper tube within the specified deformation path, allowing for slow deformation and improving the processing quality.

[0028] 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

[0029] 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.

[0030] Figure 1 A schematic diagram of a continuous drawing machine for internally threaded copper tubes;

[0031] Figure 2 for Figure 1 A structural diagram from another perspective;

[0032] Figure 3 for Figure 1 Schematic diagram of the exploded structure of the outer ring and inner column;

[0033] Figure 4 for Figure 3 Schematic diagram of the explosion structure of the inner and outer rings;

[0034] Figure 5 for Figure 3 Schematic diagram of the exploded structure of the inner column;

[0035] Figure 6 for Figure 3 Schematic diagram of the middle baffle;

[0036] Figure 7 for Figure 3 Schematic diagram of the middle support group;

[0037] Figure 8 for Figure 7 A schematic diagram of the middle side wheel and its upper structure;

[0038] Figure 9 for Figure 7 Exploded view of the central support column;

[0039] Figure 10 for Figure 1 Schematic diagram of the structure of the guide groove and guide channel;

[0040] Attached reference numerals: 100, outer ring; 101, ring groove one; 102, splicing ring; 103, slot one;

[0041] 200. Inner column; 201. Ring groove two; 202. Splicing plate; 203. Card slot two;

[0042] 300. Baffle; 301. Guide post;

[0043] 400. Support assembly; 401. Support column; 402. Side wheel; 403. Support sleeve; 404. Support platform; 405. Side plate; 406. Slat; 407. End plate; 408. Sliding plate;

[0044] 500. Machine base; 501. Vertical plate; 502. Adjusting sleeve; 503. Push-pull structure; 504. Support frame; 505. Motor;

[0045] 600, guide groove; 601, guide channel. Detailed Implementation

[0046] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0047] 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.

[0048] like Figures 1 to 3 As shown, this application provides a continuous drawing processing equipment for internally threaded copper tubes, including an outer ring 100 and an inner column 200 located inside the outer ring 100. The axis of the outer ring 100 is parallel to and offset from the axis of the inner column 200. Along the circumferential direction of the outer ring 100, the two sides of the shortest vertical line between the inner wall of the outer ring 100 and the outer wall of the inner column 200 are respectively the extrusion zone and the release zone. The extrusion zone is used to extrude the copper tube and change its diameter.

[0049] Several annular grooves 101 and several annular grooves 201 are provided on the outer wall of the outer ring 100 and the outer wall of the inner column 200. The annular grooves 101 and 201 are used in conjunction. Along the axial direction of the outer ring 100, the diameter of the groove cross section of each annular groove 101 and the diameter of the groove cross section of each annular groove 201 gradually increase or decrease.

[0050] Specifically, the inner column 200 is located inside the outer ring 100, and the outer wall of one side of the inner column 200 is close to the inner wall of one side of the outer ring 100. That is, the inner column 200 and the outer ring 100 are eccentrically arranged. In this way, two deformation spaces with gradually decreasing gaps are formed from the position where the distance between the inner wall of the outer ring 100 and the outer wall of the inner column 200 is the farthest and the position where the distance is the closest. These two spaces are the compression zone and the release zone. When the copper tube is conveyed along the circumference of the inner column 200 in the compression zone, the inner wall of the outer ring 100 and the inner column... The outer wall of the 200 ring will roll the copper tube to change its diameter, thereby achieving the effect of variable diameter drawing. Conversely, when the copper tube reaches the position where the distance between the outer ring 100 and the inner column 200 is the shortest, the copper tube will be conveyed to the release area. In this area, the copper tube will only be conveyed. The outer ring 100 can be set horizontally or vertically, and the inner column 200 can be set in the same way. In this way, the copper tube can be processed on the horizontal or vertical plane, and the drawing process of the copper tube can be achieved in both cases.

[0051] A plurality of annular grooves 101 on the outer ring 100 are correspondingly provided with a plurality of annular grooves 201 on the inner column 200. The annular grooves 101 and the corresponding annular grooves 201 can match the outer wall of the copper tube and apply a wrapping extrusion force to the copper tube. This can make the copper tube bear the force evenly. At the position where the distance between the outer ring 100 and the inner column 200 is the shortest, the inner wall of the outer ring 100 can contact the outer wall of the inner column 200. The annular grooves 101 and 201 at this position can form a circle, thereby realizing the full wrapping extrusion work in the circumferential direction of the copper tube. In some embodiments, the inner wall of the outer ring 100 at the above-mentioned shortest position can still maintain a certain distance from the outer wall of the inner column 200, which will not affect the diameter change extrusion of the copper tube.

[0052] During copper tube processing, rotating the outer ring 100 or the inner column 200 moves the end of the copper tube between the corresponding size annular groove 101 and annular groove 201. The rotating outer ring 100 or inner column 200 carries the copper tube, and friction allows the outer ring 100 and inner column 200 to rotate synchronously. As the gap in the extrusion zone gradually decreases, the inner walls of annular groove 101 and annular groove 201 in the extrusion zone synchronously extrude force onto the copper tube, causing the outer diameter of the copper tube to gradually decrease, thus achieving the extrusion and drawing effect. When the copper tube passes through the shortest distance between the outer ring 100 and the inner column 200 and enters the release zone, the diameter of the copper tube reaches the specified requirement. By using several annular grooves 101 and several annular grooves 201, copper tubes of different specifications can be processed, and copper tubes of different diameters that meet the requirements can be processed. The rotational movement of the outer ring 100 and the inner column 200 will prevent relative friction between them and the copper tube, thus protecting the copper tube.

[0053] like Figure 1 and Figure 10As shown, guide grooves 600 and guide channels 601 are respectively provided on both sides of the outer ring 100 along the axial direction. The guide channel 601 can be composed of several conveying rollers arranged in an arc shape. In this way, the copper tube can be conveyed in an arc shape using the guide channel 601, which facilitates the introduction of the copper tube into the outer ring 100. After the copper tube is processed, it can be output through the guide groove 600. Since the copper tube needs to be fed into the outer ring 100 from one end face and then output through the other end face of the outer ring 100, the input and output positions of the copper tube need to be inclined relative to the axis of the outer ring 100. When the copper tube is rolled in the outer ring 100, the shape of the copper tube is an arc shape coplanar with the corresponding annular groove 101, so as to avoid the edge of annular groove 101 and the edge of annular groove 201 causing extrusion damage to the outer wall of the copper tube when the copper tube is inclined relative to annular groove 101.

[0054] The technical solution of this invention effectively solves the drawback of continuous production during traditional hard drawing, enabling copper tubes to be continuously fed into the outer ring 100 and undergo extrusion and diameter reduction in the extrusion zone between the outer ring 100 and the inner column 200, thus improving work efficiency. Simultaneously, the rolling operation using the outer ring 100 and inner column 200 effectively reduces frictional damage to the copper tube surface, improving surface quality. This rolling method also ensures more uniform deformation of the copper tube, preventing tearing. Because the outer ring 100 and inner column 200 are relatively eccentrically positioned, the width of the extrusion zone gradually decreases, and the extrusion zone has a longer extrusion path, thereby reducing the amount of deformation of the copper tube within the specified deformation path, allowing for slow deformation and improving the processing quality of the copper tube.

[0055] Furthermore, since there are several gradually arranged annular grooves 101 and 201 on the outer ring 100 and the inner column 200 respectively, the copper tube can be rolled and its diameter changed using a corresponding annular groove 101 and annular groove 201 to achieve a one-time forming process for the copper tube. Alternatively, the copper tube can be made to spirally pass through several annular grooves 101 and several annular grooves 201 in sequence, so that each time the copper tube passes through annular groove 101 and annular groove 201, a diameter change process can be completed, thereby achieving a continuous diameter change and multiple forming process for the copper tube.

[0056] Specifically, when the diameter change of the copper tube is small, or when the quality requirements of the copper tube are low, a single diameter change can be achieved by using a corresponding annular groove 101 and annular groove 201. However, when the diameter change of the copper tube is large, or when the quality requirements of the copper tube processing are high, multiple diameter changes can be used. In multiple diameter changes, each diameter change only reduces the diameter of the copper tube within a small range, and the extrusion zone corresponding to each diameter change can provide a longer deformation path for that small diameter change. Thus, when multiple diameter changes are integrated together, a long diameter change processing path can be formed, achieving slow deformation of the copper tube.

[0057] Each time the copper tube passes through the release zone, the outer wall of the copper tube is no longer under stress. In this way, the copper tube will be subjected to a specified period of pressureless rest after each compression deformation, thereby releasing a small amount of rebound force and improving the uniformity of internal stress of the copper tube.

[0058] Furthermore, the outer ring 100 is composed of several coaxially arranged splicing rings 102, and several ring grooves 101 are correspondingly distributed on the inner walls of several splicing rings 102.

[0059] The inner column 200 is composed of several coaxially arranged splicing disks 202, and several annular grooves 201 are correspondingly distributed on the inner wall of several splicing disks 202;

[0060] A number of splicing rings 102 and a number of splicing disks 202 are set accordingly. The splicing rings 102 and the splicing disks 202 are divided into two groups, and the distance between the two groups can be adjusted.

[0061] like Figures 4 to 5 As shown, several annular grooves 101 on the inner wall of the outer ring 100 can be distributed on several splicing rings 102, that is, each splicing ring 102 has one annular groove 101. Several annular grooves 201 on the outer wall of the inner column 200 can be distributed on several splicing disks 202, that is, each splicing disk 202 has one annular groove 201. When adjusting the distance between two adjacent splicing rings 102 or splicing disks 202, the positional relationship between adjacent annular grooves 101 or adjacent annular grooves 201 can be adjusted simultaneously.

[0062] When copper tubes are undergoing spiral rolling and diameter reduction processing, the pitch can be adjusted by adjusting the distance between two adjacent splicing rings 102 and two adjacent splicing discs 202, thereby adjusting the processing mode of the copper tube. Of course, during the initial rolling and diameter reduction of the copper tube, the pitch can be made smaller because the diameter of the copper tube is larger, and the pitch can be increased accordingly during subsequent rolling because the diameter of the copper tube decreases.

[0063] It should be noted that when the copper tube is rolled in a spiral manner, the outer wall of the copper tube can only contact the inner wall of the first annular groove 101 or the inner wall of the second annular groove 201 at the beginning, and cannot contact them at the same time. This can avoid the shearing force generated on the outer wall of the copper tube by the interaction of the edge of the first annular groove 101 and the edge of the second annular groove 201 at the beginning.

[0064] By dividing several splicing rings 102 into two groups, the annular groove 101 at the output position can be separated from other annular grooves 101 with a diameter larger than its groove cross-section. That is, other annular grooves 101 can perform multiple rolling and diameter-changing processes on the copper tube. In the final stage, the copper tube needs to pass through a larger pitch and enter the annular groove 101 at the output position. Due to the increase in pitch, when the copper tube is bent, a small-angle torsion will occur in the circumferential direction of the copper tube, causing the contact position between the copper tube and annular groove 101 and annular groove 201 to change. That is, when annular groove 101 and annular groove 201 at the output position contact the outer wall of the copper tube, their contact positions are different from those during the previous rolling processes. This avoids the formation of indentations on the surface of the copper tube when only specific positions are subjected to force, thus improving the surface processing quality of the copper tube.

[0065] Since the splicing ring 102 and splicing disk 202 at the output position can be adjusted at will according to actual needs, the splicing ring 102 and splicing disk 202 can adopt a variety of grouping methods.

[0066] Furthermore, several baffles 300 are provided in both the compression zone and the release zone, and the baffles 300 are located between two adjacent annular grooves 101 or two annular grooves 201.

[0067] like Figure 3 and Figure 6 As shown, the two adjacent baffles 300 can guide and limit the outer wall of the copper tube entering between the first annular groove 101 and the second annular groove 201, so as to prevent the material moving inside the copper tube due to compression when the first annular groove 101 and the second annular groove 201 squeeze the copper tube. This will prevent the material from accumulating on the outer wall of the copper tube at the position where it does not contact the first annular groove 101 and the second annular groove 201, resulting in deformation in the direction of the copper tube end face and improving the surface quality of the copper tube.

[0068] Furthermore, a slot 103 and a slot 203 are respectively provided between two adjacent annular grooves 101 and between two adjacent annular grooves 201, and part of the baffle 300 slides within the slot 103 and the slot 203.

[0069] Guide posts 301 are provided in both the compression zone and the release zone, and baffles 300 are slidably installed on the guide posts 301 along the axial direction of the outer ring 100.

[0070] Since the splicing rings 102 and splicing disks 202 can be arbitrarily grouped, both the splicing rings 102 and the splicing disks 202 can move along the axis of the outer ring 100. In order for the baffle 300 to cooperate with the first ring groove 101 and the second ring groove 201, the movement of the first ring groove 101 and the second ring groove 201 can drive the baffle 300 to move synchronously. Specifically, by utilizing the sliding cooperation between part of the baffle 300 and the first slot 103 and the second slot 203, the baffle 300 can move relative to the first slot 103 and the second slot 203 when the outer ring 100 and the inner column 200 rotate. The baffle 300 is supported by the guide column 301, and when the splicing rings 102 and the splicing disks 202 move, they will drive the baffle 300 to slide synchronously on the guide column 301.

[0071] By using the baffle 300 and guide post 301, the baffle 300 can be moved when the position of the splicing ring 102 is adjusted, and the baffle 300 can then move the splicing plate 202, thereby achieving synchronous position adjustment of the splicing ring 102 and the splicing plate 202.

[0072] like Figure 4 and Figure 5 As shown, a slot 103 and an annular groove 101 are located on the same splicing ring 102, and a slot 203 and an annular groove 201 are located on the same splicing plate 202. When the diameter of the groove cross section of each annular groove 101 gradually decreases from top to bottom, the slot 103 on the splicing ring 102 is located on the lower side of the annular groove 101, and vice versa. The slot 203 and annular groove 201 on the inner column 200 adopt the same method.

[0073] Furthermore, a support group 400 is provided between the outer ring 100 and the inner column 200. The support group 400 includes several support columns 401 that are provided corresponding to each ring groove 101 or each ring groove 201.

[0074] Several support columns 401 can support and guide the copper tubes output from the release zone, so as to facilitate their smooth entry into the adjacent annular groove 101 and annular groove 201 in an arc shape, preventing the copper tubes from naturally falling downwards and improving the processing quality of the copper tubes. The arrangement of the support columns 401 can be along the axis of the outer ring 100, and the support columns 401 can be parallel to the axis of the outer ring 100 to achieve lateral pushing of the copper tubes. Of course, the support columns 401 can also be set at the bottom of the copper tubes output from the release zone, as long as they can support the copper tubes.

[0075] Furthermore, the axis of the support column 401 is perpendicular to the axis of the outer ring 100, and along the axis of the outer ring 100, the support column 401 is located between two adjacent annular grooves 101.

[0076] like Figure 7 As shown, taking the vertical axis of the outer ring 100 as an example, several support columns 401 are arranged along the axis of the outer ring 100, and each support column 401 is perpendicular to the axis of the outer ring 100. In this way, the copper tube output through the release zone can overlap on the support column 401, thereby supporting the copper tube. Even if the copper tube gradually increases in spiral radius as it undergoes continuous rolling and diameter change, the copper tube can still overlap on the support column 401. However, when the axis of the outer ring 100 is horizontal, the support column 401 needs to be parallel to the axis of the outer ring 100, and the support column 401 is inserted into each section of the spiral copper tube and supports that section of the copper tube.

[0077] Furthermore, the support assembly 400 also includes two opposing side plates 405. Each side plate 405 has several support platforms 404 slidably mounted along the axis of the outer ring 100. Side wheels 402 are rotatably mounted on the support platforms 404. The ends of the support columns 401 are connected to the side wheels 402. A support sleeve 403 is rotatably mounted on the outer wall of the side wheels 402. A sliding piece 408 is mounted on the support sleeve 403. Part of the sliding piece 408 is slidably inserted into the slot 103 or the slot 203. When the copper tube is rolled and reduced in diameter only once, since the copper tube will be directly output outside the outer ring 100, the support column 401 is not required to support the copper tube.

[0078] Since several splicing rings 102 and several splicing disks 202 can be arbitrarily divided into two groups, the splicing rings 102 and several splicing disks 202 need to be able to move along the axis of the outer ring 100. At this time, in order to ensure that the support column 401 always cooperates with the splicing rings 102 or splicing disks 202, the support column 401 needs to be able to move synchronously. Specifically, when the splicing rings 102 and splicing disks 202 move, the sliding plate 408 can be pushed to move synchronously by using the first slot 103 and the second slot 203. The sliding plate 408 can drive the side wheel 402 and the support column 401 to move synchronously through the support sleeve 403. The support platform 404 slides on the side plate 405. When the copper tube is rolled, the copper tube will be continuously conveyed in a spiral shape. At this time, due to friction, the copper tube will drive the support column 401 to rotate. The support column 401 drives the side wheel 402 to rotate relative to the support platform 404.

[0079] Furthermore, the processing equipment also includes a machine base 500, on which two relatively distributed vertical plates 501 and a push-pull structure 503 are provided. Each splicing ring 102 is provided with an adjusting sleeve 502, and the position of the adjusting sleeve 502 on the vertical plate 501 can be adjusted.

[0080] The output end of the push-pull structure 503 is provided with a bracket 504, the bracket 504 is provided with a motor 505, the output end of the motor 505 is provided with a prism shaft, the inner column 200 is coaxially provided on the prism shaft and can slide on the prism shaft, and the deviation between the inner column 200 and the outer ring 100 can be adjusted by the push-pull structure 503.

[0081] Since the outer ring 100 and the inner column 200 need to rotate synchronously, the splicing ring 102 and the corresponding adjusting sleeve 502 need to be able to move relative to each other. Specifically, a sliding rib is provided on the outer wall of the splicing ring 102, and the adjusting sleeve 502 is slidably installed on the sliding rib. The adjusting sleeve 502 can be installed on the upright plate 501 by means of bolts, snap-fit, etc. This makes it easy to adjust the position of the adjusting sleeve 502 on the upright plate 501, while not affecting the rotation of the splicing ring 102.

[0082] The bracket 504 is arc-shaped and spans the outer side of the outer ring 100. The bracket 504 will not interfere with the position adjustment of the splicing rings 102 on the outer ring 100. Both ends of the bracket 504 extend to the positions corresponding to the inner column 200. Since the positions of the splicing disks 202 on the inner column 200 are adjustable and the motor 505 needs to drive the splicing disks 202 to rotate, a structure in which the splicing disks 202 are slidably inserted through the prism axis can be adopted.

[0083] The push-pull structure 503 on the machine 500 can adjust the eccentric position of the inner column 200 within the outer ring 100, thereby adjusting the size of the extrusion zone and the amount of extrusion diameter change of the copper tube, making the equipment more flexible in use; the push-pull structure 503 can be any structure with push-pull function, such as a cylinder or an electric push rod.

[0084] Since the eccentricity between the inner column 200 and the outer ring 100 is adjustable, the length of the corresponding support column 401 needs to be adjustable. Specifically, the support column 401 includes two end plates 407, each end plate 407 is provided with several strips 406, and the two end plates 407 are intersected and slidably connected by several strips 406. The strips 406 are connected to the corresponding side wheels 402. The two side plates 405 are respectively installed on the machine base 500 and the bracket 504. When the inner column 200 moves, the two side plates 405 move relative to each other, and the two end plates 407 move relative to each other, thereby adjusting the overall length of the support column 401.

[0085] A method for continuous drawing of internally threaded copper tubes includes the following steps:

[0086] Adjust the position of the inner column 200 within the outer ring 100 so that the deviation between the inner column 200 and the outer ring 100 conforms to the specifications of the pre-processed copper tube;

[0087] The annular grooves 101 are divided into two groups, and one annular groove 101 that meets the specifications for copper tube output is grouped with several annular grooves 101 with a smaller diameter of the groove cross section than the annular groove 101. Several annular grooves 201 are set in correspondence with several annular grooves 101.

[0088] Rotate the inner column 200 to pass the end of the copper rod through the larger diameter of the groove cross section between the first annular groove 101 and the second annular groove 201 in a set. The inner column 200 squeezes the copper tube and uses the copper tube to drive the outer ring 100 to rotate synchronously. The squeezing area corresponding to the first annular groove 101 and the second annular groove 201 performs a squeezing and diameter reduction process on the copper tube.

[0089] Then, the copper rod is made to wrap around the inner column 200 within the outer ring 100 and pass through the adjacent ring groove 101 and splicing ring 102 again. The copper tube undergoes a second extrusion and diameter reduction process. This process is repeated so that the copper tube is spirally extruded and reduced in diameter multiple times.

[0090] After undergoing multiple diameter changes, the end of the copper tube passes between the annular groove 101 and the splicing ring 102 in another set that meet the copper tube output specifications. The copper tube that is then output is the finished copper tube.

[0091] The above-described processing method of the present invention can effectively realize a continuous drawing processing equipment for internally threaded copper tubes, and the technical effects it can achieve are as described in the above embodiments, and will not be repeated here.

[0092] 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 continuous drawing machine for internally threaded copper tubes, characterized in that, It includes an outer ring and an inner column located inside the outer ring. The axis of the outer ring is parallel to and offset from the axis of the inner column. Along the circumferential direction of the outer ring, the two sides of the shortest vertical line between the inner wall of the outer ring and the outer wall of the inner column are respectively the extrusion zone and the release zone. The extrusion zone is used to extrude the copper tube and change its diameter. Several annular grooves 1 and several annular grooves 2 are provided on the outer wall of the outer ring and the outer wall of the inner column. The annular grooves 1 and 2 are used in conjunction. Along the axial direction of the outer ring, the diameter of the groove cross section of each annular groove 1 and the diameter of the groove cross section of each annular groove 2 gradually increases or decreases. The copper tube is rolled between corresponding annular groove one and annular groove two to change its diameter, or it is rolled between several annular groove one and several annular groove two in a spiral shape to change its diameter. The outer ring is composed of several coaxially arranged splicing rings, and several ring grooves are distributed one-to-one on the inner wall of several splicing rings; The inner column is composed of several coaxially arranged splicing disks, and several annular grooves are correspondingly distributed on the inner wall of several splicing disks; A plurality of splicing rings and a plurality of splicing disks are correspondingly arranged, and the plurality of splicing rings and the plurality of splicing disks are divided into two groups, and the distance between the two groups can be adjusted.

2. The continuous drawing equipment for internally threaded copper tubes according to claim 1, characterized in that, Several baffles are provided in both the compression zone and the release zone, and the baffles are located between two adjacent annular grooves or two annular grooves.

3. The continuous drawing equipment for internally threaded copper tubes according to claim 2, characterized in that, A slot 1 and a slot 2 are respectively provided between two adjacent annular grooves 1 and between two adjacent annular grooves 2, and part of the baffle slides within the slot 1 and the slot 2; Guide posts are provided in both the compression zone and the release zone, and the baffle is slidably mounted on the guide posts along the outer ring axis.

4. The continuous drawing equipment for internally threaded copper tubes according to claim 3, characterized in that, A support group is provided between the outer ring and the inner column, and the support group includes a plurality of support columns corresponding to each of the first ring grooves or each of the second ring grooves.

5. The continuous drawing equipment for internally threaded copper tubes according to claim 4, characterized in that, The axis of the support column is perpendicular to the axis of the outer ring, and along the direction of the outer ring axis, the support column is located between two adjacent ring grooves.

6. The continuous drawing equipment for internally threaded copper tubes according to claim 5, characterized in that, The support assembly also includes two opposing side plates. Each side plate has several support platforms that are slidably arranged along the outer ring axis. A side wheel is rotatably arranged on the support platform. The end of the support column is connected to the side wheel. A support sleeve is rotatably sleeved on the outer wall of the side wheel. A sliding piece is provided on the support sleeve. Part of the sliding piece is slidably inserted into the first slot or the second slot.

7. The continuous drawing equipment for internally threaded copper tubes according to claim 1, characterized in that, The processing equipment also includes a machine base, on which two relatively distributed vertical plates and a push-pull structure are provided. Each of the splicing rings is provided with an adjusting sleeve, and the position of the adjusting sleeve on the vertical plate can be adjusted. The output end of the push-pull structure is provided with a bracket, the bracket is provided with a motor, the output end of the motor is provided with a prism shaft, the inner column is coaxially provided on the prism shaft and can slide on the prism shaft, and the deviation between the inner column and the outer ring can be adjusted by the push-pull structure.

8. A method for continuous drawing of internally threaded copper tubes, using the continuous drawing equipment for internally threaded copper tubes as described in any one of claims 1-7, characterized in that, Includes the following steps: Adjust the position of the inner column within the outer ring so that the deviation between the inner column and the outer ring conforms to the specifications of the pre-processed copper tube; Divide several annular grooves into two groups, and form a group with an annular groove that meets the specifications for copper tube output and several annular grooves with a smaller cross-sectional diameter than the groove on the annular groove. Several annular grooves are set in correspondence with several annular grooves. Rotate the inner column to pass the end of the copper rod through the larger diameter of the groove cross section between the first and second annular grooves in the set. The inner column squeezes the copper tube and uses the copper tube to drive the outer ring to rotate synchronously. The squeezing area corresponding to the first and second annular grooves performs a squeezing and diameter reduction process on the copper tube. Then, the copper rod is made to wrap around the inner column in the outer ring and pass through the adjacent ring groove and splicing ring again. The copper tube is subjected to a second extrusion and diameter reduction process. This process is repeated so that the copper tube is spirally extruded and reduced in diameter multiple times. After undergoing multiple diameter changes, the end of the copper tube passes through the annular groove and splicing ring in another set that meet the copper tube output specifications. The copper tube that is then output is the finished copper tube.

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