A drawing device and method for small-diameter thick-walled copper tubes

Abstract

The application relates to the technical field of copper pipe drawing, in particular to a small-diameter thick-wall copper pipe drawing device, which comprises a bottom plate and a fixing frame, the top end of the bottom plate is provided with a precise feeding mechanism and a suction fixing mechanism, and a drawing detection mechanism is arranged on the fixing frame; the precise feeding mechanism comprises two synchronous rollers, a plurality of chain wheels are fixedly connected to the outer walls of the two synchronous rollers, chains are connected between each group of chain wheels, and a plurality of placing seats are fixedly connected to each chain; the suction fixing mechanism comprises a shunt cavity arranged in the placing seat, and an arc-shaped groove is arranged at one end of the outer side of each placing seat; the copper pipe is stably fixed on the placing seat through suction force, so that the copper pipes can be separated, copper pipe contact during feeding is avoided, damage to the outer surface of the copper pipe caused by vibration is prevented, stress concentration at the damaged position during drawing is prevented, the situation of pipe breakage is avoided, and the drawing quality is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of copper tube drawing technology, and in particular to a drawing device and method for small-diameter, thick-walled copper tubes. Background Technology

[0002] Small-diameter thick-walled copper tubes are internally threaded copper tubes with an outer diameter of ≤5mm. They are mainly used in copper tube aluminum fin heat exchangers in the air conditioning and refrigeration industry. By replacing traditional copper tubes with a diameter of 7mm or more with small-diameter copper tubes and optimizing the fin and flow path design, the heat exchange efficiency is improved. The small-diameter thick-walled copper tubes used are made of high-quality copper materials, so they have high purity, low impurity content, excellent physical properties and good appearance quality, thus ensuring the normal use of the copper tubes.

[0003] During the production of copper tubes, the diameter of the tubes is adjusted as needed, and a pulling device is used to reduce the diameter of the copper tubes during the adjustment process.

[0004] In existing technology, before drawing copper tubes, the copper tubes need to be placed on the loading rack. At this time, the copper tubes are in contact with each other. When one of the copper tubes is drawn, the vibration generated by the operation of the equipment will be transmitted to the copper tube, and the copper tubes in contact with it will also vibrate, causing continuous collisions between the copper tubes. This will damage the outer surface of the copper tubes. The damaged area will cause a sudden change in the coefficient of friction between the copper tube and the drawing die, resulting in local stress concentration. As a result, the damaged area is prone to become the starting point for crack propagation during drawing, leading to tube breakage and affecting the drawing quality. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of the prior art by proposing a small-diameter, thick-walled copper tube drawing device and method.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a small-diameter thick-walled copper tube drawing device, comprising a base plate and a fixing frame, wherein a precision feeding mechanism and an adsorption fixing mechanism are provided at the top of the base plate, and a drawing detection mechanism is provided on the fixing frame;

[0007] The precision feeding mechanism includes two synchronous rollers, and multiple sprockets are fixedly connected to the outer walls of the two synchronous rollers. Each set of sprockets is connected to each other by a chain, and multiple placement seats are fixedly connected to each chain.

[0008] The adsorption and fixing mechanism includes a diversion cavity opened inside the placement seat. Each set of placement seats has an arc-shaped groove at one end on the outside. An arc-shaped rubber pad is fixedly connected to the inner wall of each set of arc-shaped grooves. Adsorption holes are passed through each set of diversion cavities. Each set of placement seats is used to place copper tubes to avoid contact between the copper tubes and the copper tubes. Suction is generated in the diversion cavity. When the copper tube contacts the arc-shaped rubber pad, the suction fixes the copper tube to prevent shaking during feeding.

[0009] Preferably, the adsorption and fixing mechanism further includes an annular sleeve fixedly connected to the top of the base plate. One end of the annular sleeve is rotatably connected to a rubber sleeve, and one end of each of the placement seats is fixedly connected to a support tube. Each support tube is fixedly connected to the rubber sleeve, and each group of placement seats is fixedly connected together by a connecting tube.

[0010] Preferably, exhaust fans are fixedly connected to the bottom of the annular sleeve on both sides of the top of the base plate, and the two exhaust fans are fixedly connected to the annular sleeve through pipes.

[0011] Preferably, the precision feeding mechanism further includes a first vertical plate and a second vertical plate symmetrically fixedly connected to both sides of the top of the base plate. A first rotating shaft and a second rotating shaft are respectively rotatably connected between the two sets of the first vertical plate and the second vertical plate. Both the first rotating shaft and the second rotating shaft are fixedly connected to the synchronous roller.

[0012] Preferably, a first gear is fixedly connected to one side of the outer wall of the second rotating shaft. Four evenly arranged limiting grooves are opened at one end of the outer side of the first gear. A placement plate is fixedly connected to the outer surface of the second upright plate on one side through a connecting rod. A U-shaped plate is fixedly connected to one end of the outer side of the placement plate. An electric push rod is fixedly connected to the U-shaped plate. A telescopic sleeve is fixedly connected to the telescopic end of the electric push rod. The telescopic sleeve passes through the placement plate. A spring is fixedly connected to the inner wall of the telescopic sleeve. A limiting rod is fixedly connected to the other end of the spring. The limiting rod is slidably disposed on the inner wall of the telescopic sleeve. The shape of the limiting rod and the limiting groove are adapted to each other.

[0013] Preferably, a first motor is fixedly connected to the bottom of one end of the outer side of the placement plate, a drive shaft is fixedly connected to the drive end of the first motor, the drive shaft is rotatably connected to a second upright plate on one side, a second gear is fixedly connected to the outer wall of the drive shaft, the second gear and the first gear are meshed, and the diameter of the second gear is smaller than the diameter of the first gear.

[0014] Preferably, the pull-out testing mechanism includes a fixed plate fixedly connected to the top of the fixed frame near the chain side, a pull-out die fixedly connected to the inner wall of the fixed plate, a storage seat fixedly connected to the top of the fixed frame corresponding to the fixed plate side, a moving groove provided on both sides of the top of the storage seat, a threaded rod rotatably connected to one side of the inner wall of each of the two moving grooves, the two threaded rods having the same thread direction, a tensioning device threadedly connected to the outer wall of each of the two threaded rods, and a second motor fixedly connected to both sides of the end of the storage seat away from the fixed plate, the drive ends of the two second motors and the two threaded rods being fixedly connected respectively.

[0015] Preferably, the pull-out detection mechanism further includes a rotating ring rotatably connected to the end of the fixed plate away from the chain. Visual detectors are fixedly connected to both sides of the inner wall of the rotating ring. A third motor is fixedly connected to the top of the fixed plate. The third motor and the rotating ring are connected through a gear transmission structure.

[0016] Preferably, an L-shaped rod is fixedly connected to the top of the second upright plate on one side, a three-stage cylinder is fixedly connected to the L-shaped rod, and a circular push plate is fixedly connected to the telescopic end of the three-stage cylinder.

[0017] A method for drawing small-diameter, thick-walled copper tubes includes the following steps:

[0018] Step 1: First, place the copper tube on the placement seat. At this time, the flow chamber generates suction, which makes the copper tube firmly adhere to the arc-shaped rubber pad through the suction hole, preventing the copper tube from shaking and slipping off during feeding.

[0019] Step 2: After adsorption and fixation, the copper tube is precisely fed to the drawing position by a precision feeding mechanism. Then, it is drawn by a drawing inspection mechanism. During the drawing process, the outer wall of the copper tube is inspected to avoid damage and ensure the quality of the drawing.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. Through the set adsorption and fixing mechanism, the copper tubes can be placed on different placement seats before conveying the copper tubes. Then, the copper tubes are stably fixed on the placement seats by the suction force, which can separate the copper tubes and avoid contact between the copper tubes during feeding. This prevents vibration from damaging the outer surface of the copper tubes, prevents stress concentration at the damaged area during drawing, avoids tube breakage, ensures drawing quality, and prevents the copper tubes from shaking and falling during conveying, ensuring the stability of the conveying process.

[0022] 2. Through the precise feeding mechanism, the first gear can rotate 90 degrees during the feeding of copper tubes by means of the cooperation between the limiting groove and the limiting column. At this time, the placement seat on the chain moves the same distance, so the copper tube can be precisely aligned with the drawing die. This avoids the copper tube not being able to quickly align with the drawing die during feeding, thus avoiding repeated adjustments and improving drawing efficiency.

[0023] 3. The set-up pull-out detection mechanism can rotate the vision detector during the pull-out process, thereby inspecting the outer surface of the copper tube and promptly detecting any damage to the outer surface of the copper tube after pull-out, and cleaning out the damaged copper tube. Attached Figure Description

[0024] Figure 1This is a schematic diagram of the overall structure of a small-diameter thick-walled copper tube drawing device according to the present invention;

[0025] Figure 2 This is another perspective view of the small-diameter thick-walled copper tube drawing device of the present invention;

[0026] Figure 3 This invention relates to a small-diameter, thick-walled copper tube drawing device. Figure 2 Enlarged view of the structure at point A in the middle;

[0027] Figure 4 This invention relates to a small-diameter, thick-walled copper tube drawing device. Figure 2 Enlarged view of the structure at point B in the middle;

[0028] Figure 5 This is a cross-sectional view of the placement seat of a small-diameter, thick-walled copper tube drawing device according to the present invention;

[0029] Figure 6 This is a structural diagram of the storage base of a small-diameter thick-walled copper tube drawing device according to the present invention;

[0030] Figure 7 This invention relates to a small-diameter, thick-walled copper tube drawing device. Figure 6 Enlarged view of the structure at point C;

[0031] Figure 8 This is a structural diagram of the second vertical plate of a small-diameter thick-walled copper tube drawing device according to the present invention;

[0032] Figure 9 This is a cross-sectional view of the telescopic sleeve of a small-diameter thick-walled copper tube drawing device according to the present invention.

[0033] Figure 10 This is a structural diagram of the rubber sleeve of a small-diameter, thick-walled copper tube drawing device according to the present invention.

[0034] In the diagram: 1. Base plate; 2. Fixing frame; 3. First rotating shaft; 4. First upright plate; 5. Synchronous roller; 6. Connecting pipe; 7. Placement seat; 8. Sprocket; 9. Chain; 10. Fixing plate; 11. Second upright plate; 12. Stretching device; 13. Storage seat; 14. Drawing die; 15. Ring sleeve; 16. Exhaust fan; 17. L-shaped rod; 18. First gear; 19. Limiting groove; 20. Connecting rod; 21. Second gear; 22. Telescopic sleeve; 23. First motor; 24. 25. Electric push rod; 26. U-shaped plate; 27. Placement plate; 28. Second rotating shaft; 29. ​​Three-stage cylinder; 30. Circular push plate; 31. Diverting chamber; 32. Adsorption hole; 33. Arc-shaped groove; 34. Arc-shaped rubber pad; 35. Second motor; 36. Threaded rod; 37. Moving groove; 38. Third motor; 39. Gear transmission structure; 40. Rotating ring; 41. Vision detector; 42. Limiting rod; 43. Drive shaft; 44. Spring; 45. Rubber sleeve; 46. Support tube. Detailed Implementation

[0035] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0036] like Figures 1-10 The device for drawing small-diameter, thick-walled copper tubes includes a base plate 1 and a fixing frame 2. The top of the base plate 1 is equipped with a precision feeding mechanism and an adsorption fixing mechanism, and the fixing frame 2 is equipped with a drawing detection mechanism. The precision feeding mechanism includes two synchronous rollers 5, and multiple sprockets 8 are fixedly connected to the outer walls of the two synchronous rollers 5. Each set of sprockets 8 is connected to each other by a chain 9, and multiple placement seats 7 are fixedly connected to each chain 9. The adsorption fixing mechanism includes a diversion cavity 30 opened inside the placement seat 7. An arc-shaped groove 32 is opened at one end of the outer side of each set of placement seats 7. An arc-shaped rubber pad 33 is fixedly connected to the inner wall of each set of arc-shaped grooves 32. Adsorption holes 31 are passed through each set of diversion cavities 30. Each set of placement seats 7 is used to place copper tubes to avoid contact between the copper tubes and the copper tubes. A suction force is generated in the diversion cavity 30. When the copper tube contacts the arc-shaped rubber pad 33, the suction force fixes the copper tube to prevent shaking during feeding.

[0037] like Figure 2 , Figure 10 As shown, the adsorption and fixing mechanism also includes an annular sleeve 15 fixedly connected to the top of the base plate 1. A rubber sleeve 44 is rotatably connected to one end of the annular sleeve 15. A support tube 45 is fixedly connected to one end of each placement seat 7 on one side. Each support tube 45 is fixedly connected to the rubber sleeve 44. Each group of placement seats 7 is fixedly connected together through a connecting tube 6. Exhaust fans 16 are fixedly connected to the bottom of the annular sleeve 15 on both sides of the top of the base plate 1. Both exhaust fans 16 are fixedly connected to the annular sleeve 15 through pipes. The rubber sleeve 44 is elastic, so it will deform when it encounters a bending state during rotation, without affecting the sealing between the rubber sleeve 44 and the annular sleeve 15. The rubber sleeve 44 is connected to the placement seat 7 on one side through the support tube 45, and with the cooperation of the connecting tube 6, it provides suction to each group of placement seats 7, thereby fixing the copper tube, preventing the copper tube from shaking and slipping during transportation, and separating the copper tubes to prevent them from contacting each other.

[0038] like Figure 1 , Figure 2 , Figure 3As shown, the precision feeding mechanism also includes a first vertical plate 4 and a second vertical plate 11 symmetrically fixedly connected to both sides of the top of the base plate 1. A first rotating shaft 3 and a second rotating shaft 27 are respectively rotatably connected between the two sets of first vertical plates 4 and second vertical plates 11. Both the first rotating shaft 3 and the second rotating shaft 27 are fixedly connected to the synchronous roller 5. The first vertical plate 4 and the second vertical plate 11 support the first rotating shaft 3 and the second rotating shaft 27 respectively, ensuring the normal rotation of the synchronous roller 5.

[0039] like Figure 3 , Figure 8 As shown, a first gear 18 is fixedly connected to one side of the outer wall of the second rotating shaft 27. Four evenly arranged limiting grooves 19 are provided at one end of the outer side of the first gear 18. A placement plate 26 is fixedly connected to the outer surface of the second vertical plate 11 via a connecting rod 20. A U-shaped plate 25 is fixedly connected to one end of the outer side of the placement plate 26. An electric push rod 24 is fixedly connected to the U-shaped plate 25. A telescopic sleeve 22 is fixedly connected to the telescopic end of the electric push rod 24, penetrating the placement plate 26. A spring 43 is fixedly connected to the inner wall of the telescopic sleeve 22. A limiting rod 41 is fixedly connected to the other end of the spring 43. The limiting rod 41 is slidably disposed on the inner wall of the telescopic sleeve 22, and its shape matches that of the limiting grooves 19. A small ball bearing is installed at the end of the limiting rod 41 near the first gear 18 to reduce friction and ensure smooth rotation of the first gear 18.

[0040] like Figure 3 , Figure 8 As shown, a first motor 23 is fixedly connected to the bottom of one outer end of the placement plate 26. A drive shaft 42 is fixedly connected to the drive end of the first motor 23. The drive shaft 42 is rotatably connected to a second upright plate 11 on one side. A second gear 21 is fixedly connected to the outer wall of the drive shaft 42. The second gear 21 meshes with the first gear 18, and the diameter of the second gear 21 is smaller than the diameter of the first gear 18. The engagement of the second gear 21 and the first gear 18 reduces the speed of the first motor 23, preventing excessive speed during conveying.

[0041] like Figure 2 , Figure 6 , Figure 7As shown, the drawing test mechanism includes a fixed plate 10 fixedly connected to the top of the fixed frame 2 near the chain 9. A drawing die 14 is fixedly connected to the inner wall of the fixed plate 10. A storage seat 13 is fixedly connected to the top of the fixed frame 2 corresponding to the fixed plate 10. Movable grooves 36 are provided on both sides of the top of the storage seat 13. Threaded rods 35 are rotatably connected to one side of the inner wall of each of the two movable grooves 36. The threads of the two threaded rods 35 are in the same direction. A stretching device 12 is threadedly connected to the outer wall of the two threaded rods 35. Second motors 34 are fixedly connected to both sides of the end of the storage seat 13 away from the fixed plate 10. The drive ends of the two second motors 34 are fixedly connected to the two threaded rods 35 respectively. The stretching device 12 is similar to the stretching carriage in a precision cold-drawn tube production equipment with application number CN201620250384.7, and their internal structures are identical, so it will not be described further here.

[0042] like Figure 7 As shown, the drawing inspection mechanism also includes a rotating ring 39 rotatably connected to the end of the fixed plate 10 away from the chain 9. Visual detectors 40 are fixedly connected to both sides of the inner wall of the rotating ring 39. A third motor 37 is fixedly connected to the top of the fixed plate 10. The third motor 37 and the rotating ring 39 are connected via a gear transmission structure 38. The rotation of the visual detectors 40 performs defect detection on the drawn portion, ensuring drawing quality and promptly identifying and removing damaged copper tubes. The gear transmission structure 38 consists of a gear and a gear ring. Since the gear diameter is smaller than the gear ring diameter, speed reduction can be achieved, allowing the visual detector 40 to rotate slowly.

[0043] like Figure 2 , Figure 3 , Figure 4 As shown, an L-shaped rod 17 is fixedly connected to the top of the second vertical plate 11 on one side. A three-stage cylinder 28 is fixedly connected to the L-shaped rod 17. A circular push plate 29 is fixedly connected to the telescopic end of the three-stage cylinder 28. When the copper tube reaches the precise position, the suction is turned off and the three-stage cylinder 28 is activated to push the circular push plate 29 to move, moving the copper tube onto the drawing die 14 and performing the drawing process on the copper tube.

[0044] A method for drawing small-diameter, thick-walled copper tubes includes the following steps:

[0045] Step 1: First, place the copper tube on the placement seat 7. At this time, the flow distribution cavity 30 generates suction, which makes the copper tube firmly adhere to the arc-shaped rubber pad 33 through the suction hole 31, so as to prevent the copper tube from shaking and slipping off during feeding.

[0046] Step 2: After adsorption and fixation, the copper tube is precisely fed to the drawing position by a precision feeding mechanism. Then, it is drawn by a drawing inspection mechanism. During the drawing process, the outer wall of the copper tube is inspected to avoid damage and ensure the quality of the drawing.

[0047] Working principle: First, the copper tube is placed on the upper placement seat 7. Since there is a certain distance between each group, the copper tubes can be prevented from contacting each other during feeding. Then, the exhaust fan 16 is started to generate suction in the annular sleeve 15 through the pipe. Since the annular sleeve 15 and the rubber sleeve 44 are hollow and connected to each other, the generated suction fills the interior of the annular sleeve 15 and the rubber sleeve 44. Moreover, the annular sleeve 15 and the rubber sleeve 44 are rotatably connected, and the rubber sleeve 44 is elastic, so it will deform when the rubber sleeve 44 rotates to the bending part, ensuring the connection between the annular sleeve 15 and the rubber sleeve 44. Then, with the cooperation of the support pipe 45 and the connecting pipe 6, the suction fills the diversion cavity 30 on each group of placement seats 7. Then, the copper tube is tightly adsorbed and fixed on the arc-shaped rubber pad 33 through the adsorption hole 31 to prevent the copper tube from shaking and slipping during transportation, and to avoid the copper tube from being bumped during transportation, ensuring the integrity of the outer surface of the copper tube.

[0048] After the copper tube is fixed, the electric push rod 24 is activated to move the telescopic sleeve 22 and the limiting rod 41 outward until the limiting rod 41 leaves the range of the limiting groove 19. At this time, the first motor 23 is activated to rotate the drive shaft 42 and the second gear 21, while the second gear 21 rotates the first gear 18. Since the diameter of the second gear 21 is smaller than that of the first gear 18, it can reduce speed. The first gear 18 rotates the second rotating shaft 27. Through the cooperation of the sprocket 8 and the chain 9, the synchronous rollers 5 on both sides rotate synchronously and move the placement seat 7 to transport the copper tube. Then, the electric push rod 24 is activated in the opposite direction to push the telescopic sleeve 22 and the limiting rod 41 towards the first gear 18. The limiting rod 41 contacts the first gear 18. When the first gear 18 rotates 90 degrees, the limiting rod 41 is just locked into the limiting groove 19, completing the limiting of the first gear 18. This allows the position of the copper tube to be accurately aligned with the position of the drawing die 14, avoiding repeated adjustments to the position of the copper tube, saving adjustment time, and improving drawing efficiency.

[0049] Once the copper tube reaches the precise position, the copper tube and the circular push plate 29 are also precisely aligned. Then, the exhaust fan 16 is turned off to stop the suction of the copper tube. At this time, the three-stage cylinder 28 is activated to push the circular push plate 29 to move, so that the copper tube can be pushed towards the drawing die 14. When the copper tube passes through the drawing die 14, the stretching device 12 clamps one end of the copper tube. Then, the second motor 34 is controlled by the synchronous controller to rotate synchronously, and the threaded rod 35 is rotated synchronously. The threaded effect of the threaded rod 35 causes the stretching device 12 to move, and the copper tube is drawn. During the drawing process, the third motor 37 is activated to rotate the rotating ring 39 through the gear transmission structure 38. The rotating ring 39 rotates the vision detector 40, so the outer surface of the copper tube can be inspected for defects during the drawing process, and damaged parts can be found in time. Therefore, the damaged copper tube can be picked out. Then, the above steps are repeated to draw the copper tube.

[0050] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A small-diameter, thick-walled copper tube drawing device, comprising a base plate (1) and a fixing frame (2), characterized in that: The bottom plate (1) is provided with a precision feeding mechanism and an adsorption fixing mechanism at its top, and the fixing frame (2) is provided with a pull-out detection mechanism; The precision feeding mechanism includes two synchronous rollers (5), and multiple sprockets (8) are fixedly connected to the outer walls of the two synchronous rollers (5). Each set of sprockets (8) is connected to each other by a chain (9), and multiple placement seats (7) are fixedly connected to each chain (9). The adsorption and fixing mechanism includes a diversion cavity (30) opened inside the placement seat (7). An arc-shaped groove (32) is opened at one end of the outer side of each set of placement seats (7). An arc-shaped rubber pad (33) is fixedly connected to the inner wall of each set of arc-shaped grooves (32). An adsorption hole (31) is passed through each set of diversion cavities (30). Each set of placement seats (7) is used to place copper tubes to avoid contact between copper tubes. A suction force is generated in the diversion cavity (30). When the copper tube contacts the arc-shaped rubber pad (33), the suction force fixes the copper tube to prevent shaking during feeding. The adsorption and fixing mechanism also includes an annular sleeve (15) fixedly connected to the top of the base plate (1). One end of the annular sleeve (15) is rotatably connected to a rubber sleeve (44). One end of each of the placement seats (7) is fixedly connected to a support tube (45). Each support tube (45) is fixedly connected to the rubber sleeve (44). Each group of placement seats (7) is fixedly connected together through a connecting tube (6). On both sides of the top of the base plate (1), below the annular sleeve (15), a blower (16) is fixedly connected. The two blowers (16) are fixedly connected to the annular sleeve (15) through pipes. The precision feeding mechanism also includes a first vertical plate (4) and a second vertical plate (11) symmetrically fixedly connected to the top sides of the bottom plate (1). The two sets of first vertical plates (4) and second vertical plates (11) are respectively rotatably connected by a first rotating shaft (3) and a second rotating shaft (27). The first rotating shaft (3) and the second rotating shaft (27) are both fixedly connected to the synchronous roller (5). An L-shaped rod (17) is fixedly connected to the top of the second vertical plate (11) on one side. A three-stage cylinder (28) is fixedly connected to the L-shaped rod (17). A circular push plate (29) is fixedly connected to the telescopic end of the three-stage cylinder (28). The pull-out testing mechanism includes a fixed plate (10) fixedly connected to the top of the fixed frame (2) near the chain (9), and a pull-out die (14) fixedly connected to the inner wall of the fixed plate (10). The pull-out testing mechanism also includes a rotating ring (39) rotatably connected to the end of the fixed plate (10) away from the chain (9), and visual detectors (40) are fixedly connected to both sides of the inner wall of the rotating ring (39).

2. The small-diameter thick-walled copper tube drawing device according to claim 1, characterized in that: A first gear (18) is fixedly connected to one side of the outer wall of the second rotating shaft (27). Four evenly arranged limiting grooves (19) are opened at one end of the outer side of the first gear (18). A placement plate (26) is fixedly connected to the outer surface of the second upright plate (11) on one side through a connecting rod (20). A U-shaped plate (25) is fixedly connected to one end of the outer side of the placement plate (26). An electric push rod (24) is fixedly connected to the U-shaped plate (25). A telescopic sleeve (22) is fixedly connected to the telescopic end of the electric push rod (24). The telescopic sleeve (22) passes through the placement plate (26). A spring (43) is fixedly connected to the inner wall of the telescopic sleeve (22). A limiting rod (41) is fixedly connected to the other end of the spring (43). The limiting rod (41) is slidably disposed on the inner wall of the telescopic sleeve (22). The shape of the limiting rod (41) and the limiting groove (19) are compatible.

3. The small-diameter thick-walled copper tube drawing device according to claim 2, characterized in that: A first motor (23) is fixedly connected to the bottom of one side of the placement plate (26). A drive shaft (42) is fixedly connected to the drive end of the first motor (23). The drive shaft (42) is rotatably connected to a second upright plate (11) on one side. A second gear (21) is fixedly connected to the outer wall of the drive shaft (42). The second gear (21) and the first gear (18) are meshed. The diameter of the second gear (21) is smaller than the diameter of the first gear (18).

4. The small-diameter thick-walled copper tube drawing device according to claim 1, characterized in that: The top of the fixed frame (2) is fixedly connected to a storage seat (13) on one side of the fixed plate (10). The storage seat (13) has a moving groove (36) on both sides of its top. The inner wall of the two moving grooves (36) is rotatably connected to a threaded rod (35). The two threaded rods (35) have the same thread direction. The outer wall of the two threaded rods (35) is threadedly connected to a tensioning device (12). The storage seat (13) is fixedly connected to two sides of the end away from the fixed plate (10). The driving ends of the two second motors (34) and the two threaded rods (35) are fixedly connected respectively.

5. The small-diameter thick-walled copper tube drawing device according to claim 1, characterized in that: The top of the fixed plate (10) is fixedly connected to a third motor (37), and the third motor (37) and the rotating ring (39) are connected through a gear transmission structure (38).

6. A method for drawing small-diameter, thick-walled copper tubes, characterized in that: The small-diameter thick-walled copper tube drawing device according to any one of claims 1-5 includes the following steps: Step 1: First, place the copper tube on the placement seat (7). At this time, the flow chamber (30) generates suction, which makes the copper tube tightly adhere to the arc-shaped rubber pad (33) through the adsorption hole (31), so as to prevent the copper tube from shaking and slipping when feeding. Step 2: After adsorption and fixation, the copper tube is precisely fed to the drawing position by a precision feeding mechanism. Then, it is drawn by a drawing inspection mechanism. During the drawing process, the outer wall of the copper tube is inspected to avoid damage and ensure the quality of the drawing.

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