A production equipment for drawing copper tubes

Abstract

This invention relates to the field of copper tube drawing technology, specifically to a production equipment for drawing copper tubes. The equipment includes an internal oiling mechanism, a straightening mechanism, a pre-forming mechanism, a drawing die, and a cutting mechanism. The drawing die includes an outer die and a moving mandrel. The outer die includes a die sleeve and a die core. An axial through hole is formed on the die sleeve, and the die core is embedded in the through hole. The die core has a tapered mandrel hole that communicates with the through hole. The cross-section of the mandrel hole is cross-shaped and is used to mate with the moving mandrel. The moving mandrel includes a large-diameter section, a small-diameter section, and a transition section. The transition section smoothly connects the large-diameter section and the small-diameter section. The cross-sectional shape of the moving mandrel is the same as the cross-sectional shape of the mandrel hole. This invention solves the problem of low production efficiency in existing drawing methods.

Description

Technical Field

[0001] This invention relates to the field of copper tube drawing technology, specifically to a production equipment for drawing copper tubes. Background Technology

[0002] Currently, gas water heaters often use custom-shaped copper tubes, such as double-eared or cross-shaped ones, to replace ordinary cylindrical copper tubes, thereby improving heat exchange efficiency and speeding up the hot water delivery time. These custom-shaped copper tubes are generally drawn from cylindrical copper tube blanks.

[0003] A typical copper tube drawing die includes an outer die and a mandrel. In existing technologies, a fixed mandrel is generally used, with a mandrel inserted inside. The mandrel fixes the mandrel to the mandrel hole in the outer die. The copper tube blank is fitted over the mandrel, passes through the mandrel hole, and is then connected to the drawing machine. During drawing, the shapes of the outer die and the mandrel together determine the shape of the copper tube. The outer die determines the outer diameter of the copper tube, the mandrel determines the inner diameter, and the gap between the mandrel and the mandrel hole determines the wall thickness of the copper tube, thereby achieving the drawing and shaping of the copper tube.

[0004] However, the above-mentioned drawing method requires the use of a core rod to fix the core head. The length of the core rod is fixed. Due to the limitation of the core rod length, copper tubes can only be drawn one segment at a time, making continuous drawing impossible and resulting in low production efficiency. Summary of the Invention

[0005] The present invention aims to provide a production equipment for drawing copper tubes to solve the problem of low production efficiency of existing drawing methods.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A production device for drawing copper tubes includes an internal oiling mechanism, a straightening mechanism, a pre-forming mechanism, a drawing die, and a cutting mechanism. The drawing die includes an outer die and a moving mandrel. The outer die includes a die sleeve and a die core. The die sleeve has an axially formed through hole. The die core is embedded in the through hole. The die core has a tapered core hole that communicates with the through hole. The cross-section of the core hole is cross-shaped and is used to mate with the moving mandrel. The moving mandrel includes a large-diameter section, a small-diameter section, and a transition section. The transition section is smoothly connected between the large-diameter section and the small-diameter section. The cross-sectional shape of the moving mandrel is the same as the cross-sectional shape of the core hole.

[0008] The beneficial effects of this invention are as follows:

[0009] The internal oiling mechanism is used to apply oil to the inside of the copper coil. During drawing, the floating mandrel is installed inside the copper tube and moves within it. Applying oil inside the copper coil reduces friction and facilitates the movement of the floating mandrel. The straightening mechanism straightens the copper coil into a straight copper tube, and the pre-forming mechanism pre-forms the straight copper tube into an elliptical shape for easier subsequent drawing. After pre-forming, the copper tube is drawn into a cross shape using a drawing die. The outer die works in conjunction with the floating mandrel to achieve the drawing of the copper tube. During actual drawing, the floating mandrel is located at the mandrel hole, with its smaller diameter section facing the drawing direction. The gap between the floating mandrel and the mandrel hole allows the tube material to pass through. The tube blank is passed from the larger diameter end of the mandrel hole to the smaller diameter end and then connected to the drawing machine. During drawing, the smaller diameter section determines the inner diameter of the formed tube, the mandrel hole determines the outer diameter, the shape of the smaller diameter section and the mandrel hole determines the shape of the tube, and the gap between the floating mandrel and the mandrel hole determines the wall thickness, thus achieving the drawing process. When the floating mandrel tends to move in the drawing direction, due to the presence of the large-diameter section and the transition section, and the relatively small diameter of the formed tube, the transition section and the large-diameter section will get stuck at the already formed tube and will not continue to move forward. Furthermore, due to the forward pushing effect of the drawing force on the floating mandrel, it cannot move backward toward the large-diameter section. Therefore, the floating mandrel can move at the mandrel hole, achieving tube drawing. This solution utilizes the structural characteristics of the floating mandrel itself to prevent its back-and-forth movement, allowing it to be fixed at the mandrel hole without the need for a mandrel rod, thus enabling continuous drawing and improving tube drawing efficiency.

[0010] Furthermore, the mold core is also provided with a shaping hole and a connecting hole. The shaping hole connects the connecting hole and the small diameter end of the core hole. The through hole includes a discharge section, and the connecting hole smoothly connects the shaping hole and the discharge section. The through hole also includes a feeding section, which connects to the large diameter end of the core hole. The diameter of the feeding section is larger than the diameter of the large diameter end of the core hole.

[0011] Beneficial effects: After the tube is drawn through the core hole, it is shaped at the shaping hole and then discharged through the discharge section. The connecting hole is used to connect the shaping hole and the discharge section, so that the tube can be discharged more smoothly. A feeding section is set, and the diameter of the feeding section is larger than the diameter of the large diameter end of the core hole, which facilitates the feeding of the tube.

[0012] Furthermore, both the connecting hole and the discharge section are conical, with the smaller diameter end of the discharge section connected to the connecting hole.

[0013] Beneficial effect: This setting can effectively expand the space outside the shaping hole, making it easier for the pipe to be discharged.

[0014] Furthermore, the end of the feeding section away from the core hole has a rounded corner, and the end of the discharge section away from the core hole also has a rounded corner. The large diameter ends of the horizontal and vertical parts of the core hole also have rounded corners, and the connection between the shaping hole, the core hole, and the connecting hole all have rounded corner transitions.

[0015] Beneficial effects: This design can prevent the sharp edges from scratching the pipe and also reduce the resistance to the pipe, making it easier to pull out the pipe and making the pipe pulling out smoother.

[0016] Furthermore, the taper of the discharge section is 60°.

[0017] Beneficial effect: This setting allows for better material discharge.

[0018] Furthermore, the taper of the core hole is 15–70°.

[0019] Beneficial effects: The taper of the core hole is set between 15 and 70°, which can accommodate various models of floating cores while ensuring that the floating core can move, making it widely applicable.

[0020] Furthermore, the taper of the core hole is 26°.

[0021] Beneficial effects: At this angle, the moving core head moves best, and the pulling is most stable.

[0022] Furthermore, the compression zone angle of the swimming core is 10–60°.

[0023] Beneficial effect: Within this angle range, the moving mandrel can move well at the mandrel hole for continuous drawing of the tube.

[0024] Furthermore, the compression zone angle of the swimming core is 22°.

[0025] Beneficial effect: This setting can better prevent the swimming mandrel from moving in the pulling direction, further improving the stability of the swimming mandrel.

[0026] Furthermore, an external oiling mechanism for applying oil to the outside of the copper tube is provided on one side of the feed end of the outer mold.

[0027] Beneficial effects: Applying oil to the outside of the copper tube can reduce the friction between the billet and the drawing die, allowing the billet to pass smoothly through the core hole, while also preventing wear on the outer wall of the copper tube during wire drawing, thus improving the quality of the copper tube. Attached Figure Description

[0028] Figure 1 This is an end view of the outer mold in Embodiment 1 of the invention;

[0029] Figure 2 for Figure 1 EE sectional view;

[0030] Figure 3 This is an end view of the floating core head in Embodiment 1 of the invention;

[0031] Figure 4 for Figure 3 The left view;

[0032] Figure 5 for Figure 3 Top view;

[0033] Figure 6 This is a longitudinal sectional view of the external oiling mechanism in Embodiment 2 of the present invention;

[0034] Figure 7 This is an end view of the oil-coated sleeve in Embodiment 2 of the present invention;

[0035] Figure 8 This is a longitudinal sectional view of the external oiling mechanism in Embodiment 3 of the present invention. Detailed Implementation

[0036] The following detailed description illustrates the specific implementation method:

[0037] The reference numerals in the accompanying drawings include: mold sleeve 1, core hole 2, feed section 5, mold core 6, discharge section 7, connecting hole 8, shaping hole 9, floating core head 10, large diameter section 11, transition section 12, small diameter section 13, channel 14, sleeve 15, oil storage cavity 16, gear plate 17, incomplete gear 18, oil outlet pipe 19, gear 20, gear ring 21, oiling sleeve 22, skeleton 23, oil absorption layer 24, oiling layer 25, air blowing pipe 26, piston 27, piston cavity 28, air outlet pipe 29, and air suction pipe 30.

[0038] Example 1:

[0039] A production device for drawing copper tubes includes an internal oiling mechanism, a straightening mechanism, a preforming mechanism, a drawing die, and a cutting mechanism. The internal oiling mechanism is used to apply oil to the inside of the copper tube. The straightening mechanism is used to straighten the copper coil. The preforming mechanism is used to extrude and preform the straightened copper tube into an elliptical shape. The drawing die is used to draw the preformed copper tube into a cross-shaped tube. The cutting mechanism is used to cut the drawn tube as needed. In this embodiment, the internal oiling mechanism adopts an oiling machine for applying oil to the inside of the copper tube in the prior art. The straightening mechanism adopts a roller straightening mechanism used in copper tube drawing in the prior art. The preforming mechanism also adopts an extrusion die in the prior art. The cutting mechanism adopts a tube cutting machine in the prior art. These are all prior art technologies and will not be described in detail in this embodiment.

[0040] Drawing dies include an outer die and a moving mandrel 10, such as Figure 1 and Figure 2 As shown, the outer mold includes a mold sleeve 1 and a mold core 6. The mold sleeve 1 has an axially oriented through hole, and the mold core 6 is fitted into the through hole. The mold core 6 has an axially oriented tapered core hole 2, and the right end of the core hole 2 is sequentially connected to a shaping hole 9 and a connecting hole 8. The taper of the core hole 2 (…) Figure 2The C-angle in the core hole 2 is 15-70°. Specifically, in this embodiment, the taper of the core hole 2 is 26°. The cross-section of the core hole 2 is cross-shaped, and the length of the horizontal part of the cross is less than the length of the vertical part. Specifically, the length of the vertical part at the small diameter end of the core hole 2 is 27-29 mm, which is 28 mm in this embodiment, and the length of the horizontal part at the small diameter end of the core hole 2 is 12-14 mm, which is 13 mm in this embodiment. The included angle between the two sides of the vertical part at the small diameter end of the core hole 2 is... Figure 1 The angle of A in the middle is 7°, and the included angle between the two sides of the horizontal section at the small diameter end of the core hole 2 is ( Figure 1 The angle of B is 60°.

[0041] The through-hole includes an inlet section 5 and an outlet section 7. The inlet section 5 is connected to the large-diameter end of the core hole 2, and the diameter of the inlet section 5 is larger than the diameter of the large-diameter end of the core hole 2. A connecting hole 8 smoothly connects the shaping hole 9 and the outlet section 7. Both the connecting hole 8 and the outlet section 7 are tapered, and the small-diameter end of the outlet section 7 is connected to the connecting hole 8. The taper of the outlet section 7 is (…). Figure 2 The angle D in the diagram is 60°.

[0042] like Figure 2 As shown, the left end of the feeding section 5 has a rounded corner with a radius of 1.5 mm; the right end of the discharge section 7 also has a rounded corner with a radius of 5 mm. The large-diameter end of the core hole 2 has a rounded corner with a radius of 5 mm. The connection points between the shaping hole 9 and the core hole 2 and the connecting hole 8 are all rounded with a radius of 2 mm.

[0043] like Figure 3 , Figure 4 and Figure 5 As shown, the movable mandrel 10 includes a large-diameter section 11, a small-diameter section 13, and a transition section 12, with the transition section 12 smoothly connecting the large-diameter section 11 and the small-diameter section 13. In this embodiment, the length of the movable mandrel 10 is 30 mm, the length of the transition section 12 is 6.17 mm, and the length of the small-diameter section 13 is 12 mm. The compression zone angle of the movable mandrel 10 is 10–60°, preferably 22° in this embodiment. Figure 4 Angle F in the middle.

[0044] Combination Figure 3 It can be seen that the cross-section of the moving core head 10 has the same shape as the cross-section of the core hole 2, which is also cross-shaped. The length of the horizontal part of this cross shape is less than the length of the vertical part. Specifically, in this embodiment, the horizontal part of the small diameter section 13 ( Figure 1 The length of the horizontal section is 11mm, and the length of the vertical section of the small diameter section 13 is 26mm; the length of the horizontal section of the large diameter section 11 is ( Figure 5 The length of the middle section (H) is 14mm, and the length of the vertical part of the large diameter section 11 is ( Figure 4 The medium length (G) is 29mm.

[0045] The specific implementation process is as follows:

[0046] Select a suitable size hardened round copper coil. Use an internal oiling mechanism to apply oil to the inside of the copper coil. After oiling, insert the floating mandrel 10 into the end of the copper coil, with the small diameter section 13 of the floating mandrel 10 facing the direction of travel of the copper coil. Then, point the end of the copper coil. Use a straightening mechanism to straighten the pointed copper coil to obtain a hardened round copper tube. Use a pre-forming mechanism to extrude and pre-form the straightened copper tube, making the cross-section of the copper tube elliptical, thus obtaining a blank for making a cross-shaped tube. Send the blank into a drawing die for one-time drawing. After drawing, cut the copper tube as needed.

[0047] Specifically, during drawing, the floating mandrel 10 is located at the mandrel hole 2, with the small-diameter section 13 of the floating mandrel 10 facing the drawing direction. The gap between the floating mandrel 10 and the inner wall of the mandrel hole 2 allows the tube to pass through. After the tube is fitted over the floating mandrel 10, it passes through the mandrel hole 2 from left to right and is then connected to the drawing machine (using a drawing machine in the prior art). The drawing machine is started to draw the tube. The tube passes sequentially through the feeding section 5, the gap between the mandrel hole 2 and the floating mandrel 10, the shaping hole 9, and the connecting hole 8. When the tube passes through the gap between the mandrel hole 2 and the floating mandrel 10, it is drawn into a cross shape and shaped at the shaping hole 9. Finally, it is pulled out from the discharge section 7. The shape of the moving mandrel 10 and the mandrel hole 2 together determine the shape of the tube. The gap between the moving mandrel 10 and the inner wall of the mandrel hole 2 determines the wall thickness of the tube. The mandrel hole 2 determines the outer diameter of the tube, and the moving mandrel 10 determines the inner diameter of the tube. This process draws out a tube with a cross-shaped cross section. In this embodiment, the drawing machine is the existing copper tube drawing machine, which will not be described in detail here.

[0048] During drawing, when the floating mandrel 10 tends to move forward (towards the drawing machine) due to the drawing force of the drawing machine, the floating mandrel 10 cannot move forward (towards the drawing machine) within the tube because there is a transition section 12 and a large-diameter section 11, while the tube at the small-diameter section 13 has already been formed and has a smaller diameter. Furthermore, the floating mandrel 10 is also subjected to the forward drawing action of the drawing machine, so it cannot move backward within the tube. Therefore, the floating mandrel 10 can move at the mandrel hole 2 without the need for a mandrel to fix it, and is not restricted by the mandrel, thus enabling continuous drawing of the copper tube.

[0049] During drawing, an external oiling mechanism (not shown in the figure) is installed at the feed end of the outer die to spray oil onto the outer wall of the blank. In this embodiment, the external oiling mechanism adopts the oiling mechanism used in copper tube drawing in the prior art, which will not be described in detail here.

[0050] Example 2

[0051] The difference between this embodiment and Embodiment 1 lies in the structure of the external oiling mechanism. Specifically, as shown... Figure 6 As shown, the external oiling mechanism includes a sleeve 15, with a channel 14 axially extending through the sleeve 15 for the copper tube to pass through. The right end of the sleeve 15 can be bolted to the left end of the outer mold. After installation, the channel 14 is connected to the through hole of the outer mold.

[0052] An oiled sleeve 22 is rotatably installed on the inner wall of channel 14, combined with Figure 7 As can be seen, the oiling sleeve 22 includes a mesh skeleton 23, and the skeleton 23 is filled with an oil-absorbing layer 24. In this embodiment, the oil-absorbing layer 24 is made of oil-absorbing cotton. An oiling layer 25 is glued and fixed to the inner wall of the oiling sleeve 22. In this embodiment, the oiling layer 25 is made of soft and oil-absorbing materials such as sponge or cotton cloth. An oil storage cavity 16 is opened in the inner wall of the sleeve 15 above the channel 14. The bottom of the oil storage cavity 16 is connected to an oil outlet pipe 19. A valve is installed on the oil outlet pipe 19. In this embodiment, the valve is a solenoid valve. The oiling sleeve 22 is set at the oil outlet pipe 19. An oil inlet pipe (not shown in the figure) is installed in the oil storage cavity 16. The oil in the oil storage cavity 16 flows to the oiling sleeve 22 through the oil outlet pipe 19. The pipe passes through the oiling sleeve 22, and the lubricating oil is coated on the pipe through the oiling layer 25.

[0053] The oiling sleeve 22 is connected to a drive mechanism for driving its rotation. The right end of the oiling sleeve 22 extends out of the sleeve 15. The drive mechanism includes a gear ring 21 and a gear 20. The gear ring 21 is welded to the right end of the oiling sleeve 22 and is concentrically arranged with the oiling sleeve 22. The gear 20 is rotatably mounted on the right side of the sleeve 15 and meshes with the gear ring 21. The diameter of the gear 20 is smaller than the diameter of the gear ring 21. The gear 20 is driven to rotate by a motor.

[0054] A sealing mechanism for sealing the oil outlet pipe 19 is installed inside the oil storage chamber 16. The sealing mechanism includes a toothed plate 17, which is slidably installed at the oil outlet pipe 19. A spring (not shown in the figure) connects the toothed plate 17 to the inner wall of the oil storage chamber 16. When the toothed plate 17 slides to the oil outlet pipe 19, it can seal the oil outlet pipe 19. An incomplete gear 18 meshes above the toothed plate 17. The incomplete gear 18 is coaxially connected to the gear 20. The incomplete gear 18 is located inside the oil storage chamber 16. The rotating shaft of the gear 20 extends into the oil storage chamber 16 and connects to the incomplete gear 18. The rotating shaft is rotatably connected to the side wall of the oil storage chamber 16, and the connection is sealed by an oil seal to prevent oil leakage.

[0055] In practical applications, the sleeve 15 is installed on the left side of the outer mold using bolts, so that the channel 14 is connected to the through hole of the outer mold. During drawing, the valve is opened, the motor is started to drive the gear 20 to rotate, the gear 20 drives the incomplete gear 18 to rotate, the incomplete gear 18 intermittently meshes with the toothed plate 17, and when the incomplete gear 18 meshes with the toothed plate 17, it drives the toothed plate 17 to slide, so that the toothed plate 17 is misaligned with the oil outlet pipe 19, thereby exposing the oil outlet pipe 19. The lubricating oil in the oil storage chamber 16 can flow to the oiling sleeve 22 through the oil outlet pipe 19. The lubricating oil is absorbed by the oil absorption layer 24, and finally coated on the pipe through the oiling layer 25, thereby achieving oiling of the outer wall of the pipe.

[0056] While gear 20 rotates, it also drives gear ring 21 to rotate. Since the diameter of gear ring 21 is larger than that of gear 20, gear ring 21 can rotate relatively slowly, thereby driving oiling sleeve 22 to rotate slowly. The rotation of oiling sleeve 22 allows for more even application of lubricating oil, improving the oiling effect on the pipe. When pulling stops, the motor and valve are closed, preventing lubricating oil from flowing out of oil reservoir 16 and avoiding waste of lubricating oil.

[0057] In this embodiment, the gear 20 drives the oiling sleeve 22 to rotate, allowing the lubricating oil to be evenly coated on the pipe, resulting in better oiling performance. Furthermore, the incomplete gear 18 intermittently drives the sealing plate to slide, thereby intermittently opening the oil outlet pipe 19, achieving intermittent oil supply and preventing unnecessary waste caused by continuous lubricating oil outflow. The rotation of the incomplete gear 18 within the oil reservoir 16 also agitates the lubricating oil to a certain extent, preventing sedimentation and ensuring sufficient fluidity.

[0058] Example 3

[0059] like Figure 8 As shown, the difference between this embodiment and Embodiment 2 is that an annular piston chamber 28 is formed inside the sleeve 15. The piston chamber 28 is located to the left of the oil storage chamber 16 and is concentrically arranged with the sleeve 15. An annular piston 27 is slidably installed inside the piston chamber 28, and the piston 27 is connected to a cylinder. Several blowing pipes 26 are evenly connected to the left end of the piston chamber 28, and the blowing pipes 26 are tilted and aligned with the inlet of the channel 14. Several suction pipes 30 are evenly connected to the right end of the piston chamber 28. The suction pipes 30 are installed inside the piston chamber 28, with their free ends facing the channel 14. A one-way valve for one-way air intake towards the piston chamber 28 is installed on the suction pipes 30. An air outlet pipe 29 is connected to the outside of the right end of the piston chamber 28. The free end of the air outlet pipe 29 extends outside the sleeve 15, and a one-way valve for air exhaust towards the sleeve 15 is installed on the air outlet pipe 29.

[0060] During the drawing process, the cylinder drives the piston 27 to reciprocate within the piston chamber 28. When the piston 27 moves to the left, the space on the left side of the piston 27 is compressed, while the space on the right side increases. The gas in the left space is forced out through the blower pipe 26, and the gas in the blower pipe 26 is blown onto the tube, thereby removing impurities from the tube and preventing impurities from affecting the drawing quality. At the same time, a negative pressure is formed in the space on the right side of the piston 27, and the gas in the channel 14 is drawn into the piston chamber 28 through the suction pipe 30. When the tube, after being cleaned by the blower, is drawn to the suction pipe 30, even if there are residual impurities on it, these impurities can still be sucked away through the suction pipe 30, thereby improving the cleaning effect of the tube.

[0061] When piston 27 moves to the right, the space on the right side of piston 27 is compressed, and the gas inside is blown out from the blow pipe 26, thereby expelling the adsorbed impurities. Since a one-way valve is installed on the suction pipe 30, the impurities will not be discharged into the channel 14.

[0062] This embodiment cleans impurities from the pipe before oiling, preventing impurities from being pressed into the pipe surface during drawing, thus avoiding impact on surface smoothness and excessive friction due to impurities, which would also affect drawing. This embodiment combines blowing and suction to clean impurities, improving the cleaning effect.

[0063] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A production equipment for drawing copper tubes, characterized in that: The system includes an internal oiling mechanism, a straightening mechanism, a preforming mechanism, a drawing die, and a cutting mechanism. The drawing die includes an outer die and a moving mandrel. The outer die includes a die sleeve and a die core. The die sleeve has an axially oriented through hole, and the die core is embedded in the through hole. The die core has a tapered core hole that communicates with the through hole. The core hole has a cross-shaped cross-section and is used to mate with the moving mandrel. The moving mandrel includes a large-diameter section, a small-diameter section, and a transition section. The transition section smoothly connects the large-diameter section and the small-diameter section. The cross-sectional shape of the moving mandrel is similar to that of the moving mandrel. The cross-sectional shapes of the holes are identical; an external oiling mechanism is installed at the feed end of the outer mold. The external oiling mechanism includes a sleeve with an axially penetrating channel for a copper tube to pass through. The sleeve can be bolted to the left end of the outer mold, and after installation, the channel communicates with the through hole of the outer mold. An oiling sleeve is rotatably installed on the inner wall of the channel. The oiling sleeve includes a mesh skeleton filled with an oil-absorbing layer. An oiling layer is glued to the inner wall of the oiling sleeve. An oil storage cavity is opened in the inner wall of the sleeve above the channel. An oil outlet pipe is connected to the bottom of the oil storage cavity. A valve is installed on the sleeve, and an oiling sleeve is located at the oil outlet pipe. An oil inlet pipe is installed in the oil storage chamber. Lubricating oil in the storage chamber flows to the oiling sleeve through the oil outlet pipe. The pipe passes through the oiling sleeve, and the lubricating oil is coated onto the pipe by the oiling layer. The oiling sleeve is connected to a drive mechanism for rotating it. The right end of the oiling sleeve extends out of the sleeve. The drive mechanism includes a gear ring and a gear. The gear ring is welded to the right end of the oiling sleeve and is concentrically arranged with it. The gear is rotatably mounted on the right side of the sleeve and meshes with the gear ring. The gear has a smaller diameter. The gear is driven to rotate by a motor, and a sealing mechanism for blocking the oil outlet pipe is installed in the oil storage chamber. The sealing mechanism includes a toothed plate, which is slidably installed at the oil outlet pipe. A spring is connected between the toothed plate and the inner wall of the oil storage chamber. When the toothed plate slides to the oil outlet pipe, it can block the oil outlet pipe. An incomplete gear meshes above the toothed plate. The incomplete gear is coaxially connected to the gear and is located in the oil storage chamber. The shaft of the gear extends into the oil storage chamber and connects with the incomplete gear. The shaft is rotatably connected to the side wall of the oil storage chamber.

2. The production equipment for drawing copper tubes according to claim 1, characterized in that: The mold core is also provided with a shaping hole and a connecting hole. The shaping hole connects the connecting hole and the small diameter end of the core hole. The through hole includes a discharge section, and the connecting hole smoothly connects the shaping hole and the discharge section. The through hole also includes a feeding section, which connects to the large diameter end of the core hole. The diameter of the feeding section is larger than the diameter of the large diameter end of the core hole.

3. The production equipment for drawing copper tubes according to claim 2, characterized in that: Both the connecting hole and the discharge section are conical, with the smaller diameter end of the discharge section connected to the connecting hole.

4. The production equipment for drawing copper tubes according to claim 3, characterized in that: The end of the feeding section away from the core hole has a rounded corner, and the end of the discharge section away from the core hole also has a rounded corner. The large diameter ends of the horizontal and vertical parts of the core hole have rounded corners, and the connection between the shaping hole, the core hole, and the connecting hole has a rounded transition.

5. The production equipment for drawing copper tubes according to claim 4, characterized in that: The taper of the discharge section is 60°.

6. The production equipment for drawing copper tubes according to claim 5, characterized in that: The taper of the core hole is 15~70°.

7. The production equipment for drawing copper tubes according to claim 6, characterized in that: The taper of the core hole is 26°.

8. The production equipment for drawing copper tubes according to claim 7, characterized in that: The compression zone angle of the moving core head is 10~60°.

9. The production equipment for drawing copper tubes according to claim 8, characterized in that: The compression zone angle of the moving core is 22°.

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