Production and rolling integrated preparation mechanism and method for internal thread copper pipe

Abstract

The invention relates to the technical field of internal thread copper pipe production and rolling, and discloses an internal thread copper pipe production and rolling integrated preparation mechanism and method.The internal thread copper pipe production and rolling integrated preparation mechanism comprises a first base, a straightening machine and a high-frequency spinning motor are fixedly installed at the upper end of the first base, and the high-frequency spinning motor is located on the left side of the straightening machine; a second base is fixedly installed at the left end of the first base, a chain type drawing machine is fixedly installed at the upper end of the second base, a flat cable pre-bending wheel set is installed at the left end of the chain type drawing machine, and a winding machine is installed at the left end of the second base. According to the invention, the stability control is simple, and the problems of high linear defects, high material loss rate, high equipment dependence and high maintenance cost in the prior art are solved; and meanwhile, the problems of insufficient automation degree, winding disc structure design defects, mechanical structure complexity, energy consumption and short intelligent control of the rewinding machine in practical application are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of production and winding of internally threaded copper tubes, and in particular to an integrated production and winding preparation mechanism and method for internally threaded copper tubes. Background Art

[0002] Internally threaded copper tube production technology is a technology widely used in refrigeration, air conditioning, heat exchangers and other fields. Its core lies in forming spiral grooves inside the copper tube through a specific manufacturing process, thereby increasing the contact area between the inner wall of the tube and the fluid and improving heat exchange efficiency.

[0003] The existing internal thread copper tube production technology has the following problems:

[0004] (1) Process stability control is complex and linear defects are common:

[0005] Asymmetric, discontinuous and irregularly oriented linear defects (such as jagged fractures) are easily generated during the production process, with a depth of up to 0.03mm to penetrate the tube wall. Such defects will cause cracking of the expanded tube during the expansion process, and the yield rate will be reduced by about 3%-5%. The main reasons include excessive gas content in the copper melt (such as residual hydrogen and oxygen), mismatch of spinning forming parameters, and stress concentration in the sizing empty drawing section. Defective sections are mostly concentrated in the later stages of processing and are difficult to eliminate in time through conventional detection methods. Existing technologies rely on empirical parameter adjustment and lack a real-time closed-loop feedback system, resulting in performance fluctuations of up to ±8% for products in the same batch. For example, when the wall thickness is reduced to below 0.25mm, the probability of tooth collapse increases by 3 times.

[0006] (2) High material loss rate, high equipment dependence and maintenance costs:

[0007] The multiple processing steps (rolling, coiling, forming, winding, and annealing) result in a cumulative loss rate of 12%-15%, of which copper chips from the milling process account for 6% and the annealing oxide layer accounts for 3%. Compared with seamless copper tubes, internally threaded tubes consume 25%-30% more energy per unit length.

[0008] (3) The rewinding machine has the following technical defects and functional limitations in actual application:

[0009] ① Insufficient automation

[0010] The equipment still relies on manual assistance to complete key processes such as pipe threading and parameter adjustment, resulting in low production efficiency and high labor costs. For example, the defect marking process requires frequent intervention to clean the spray gun or adjust parameters, which directly affects the stability of continuous production.

[0011] ② Design defects of winding structure

[0012] Traditional reels lack an effective copper tube compaction mechanism, which can lead to loose and loosely arranged copper tubes during rewinding. While protective structures are incorporated into the side reel binding openings, they fail to address the issue of interlayer slippage during high-speed rewinding, impacting the quality of the finished coil.

[0013] ③ Mechanical structure complexity and energy consumption issues

[0014] The equipment's transmission systems often use a multi-stage mechanical speed-variable structure, resulting in bulky and difficult maintenance. The drive unit has low energy efficiency, and the DC motor speed control system has high power loss. Furthermore, the noise generated by mechanical vibration often exceeds 75dB, which does not meet modern factory environmental standards.

[0015] ④ Shortcomings of intelligent control

[0016] Traditional control systems lack real-time closed-loop adjustment capabilities for core parameters like tension and speed, making it easy for tension fluctuations to cause surface scratches on the pipe during the rewinding process. Data acquisition systems lack integrated analysis of process parameters and quality traceability, making it difficult to provide early warning of process quality.

[0017] Therefore, an integrated production and winding preparation mechanism and method for internally threaded copper tubes are proposed. Summary of the Invention

[0018] The invention provides an integrated production and winding mechanism for internally threaded copper tubes, which solves the problems in the background technology.

[0019] In order to achieve the above object, the present invention adopts the following technical solutions:

[0020] An integrated production and winding mechanism for internally threaded copper tubes comprises a first base, wherein a straightener and a high-frequency spinning motor are fixedly mounted on the upper end of the first base, and the high-frequency spinning motor is located on the left side of the straightener;

[0021] A second base is fixedly installed on the left end of the first base, a chain drawing machine is fixedly installed on the upper end of the second base, a wire arrangement pre-bending wheel group is installed on the left end of the chain drawing machine, and a winding machine is installed on the left end of the second base.

[0022] Preferably, the chain drawing machine includes a mounting frame, which is fixedly mounted on the upper end of the second base. An upper traction chain and a lower traction chain are mounted on the front end of the mounting frame. The upper traction chain is located directly above the lower traction chain, and a lifting cylinder is mounted on the upper traction chain.

[0023] Preferably, a lower traction motor and an upper traction motor are fixedly mounted on the front end of the mounting frame, the lower traction motor is connected to the lower traction chain, and the upper traction motor is connected to the upper traction chain.

[0024] Preferably, the arm lifting cylinder includes a mounting backplate, which is fixedly mounted on the left end of the mounting frame, a guide wheel group is installed at the front end of the mounting backplate, an arm lifting cylinder is fixedly mounted on the front end of the top of the mounting backplate, a wiring arm is installed at the lower end of the output end of the arm lifting cylinder, and the output end of the arm lifting cylinder is connected to the mounting backplate through a first slider linear guide rail.

[0025] Preferably, a pre-bending cylinder is fixedly installed on the front end of the top of the mounting backplate, a pre-bending wheel is installed at the lower end of the output end of the pre-bending cylinder, and the output end of the pre-bending cylinder is connected to the mounting backplate through a second slider linear guide rail.

[0026] Preferably, a vertical lifting cylinder is installed at the rear end of the mounting backplate.

[0027] Preferably, a horizontal push-pull cylinder is installed at the rear end of the mounting backplate, and the output end of the horizontal push-pull cylinder is connected to the mounting backplate through a third slider linear guide rail.

[0028] The present invention also provides an integrated production and winding method for an internally threaded copper tube, comprising the following steps:

[0029] A. Exhaust the raw copper tube for 1 to 3 minutes, then pour a certain amount of copper tube stretching oil from the tube mouth, and insert the floating internal thread core head deep into the tube. At the same time, knock out a concave position about 2m away from the tube mouth to prevent the core head from moving;

[0030] B. Place a small iron rod with M4 external thread at the pipe mouth and squeeze it with a heading machine to make it fit tightly with the copper pipe;

[0031] C. After passing the traction rod through the straightening machine, high-frequency spinning motor, chain drawing machine, and cable arrangement and pre-bending wheel assembly in sequence, twist the small iron rod with M4 external thread in step B to the tail end of the traction rod;

[0032] D. Start the lifting cylinder on the chain drawing machine to tighten the drawbar, then start the cooling oil pump motor for 5s-10s, start the high-frequency spinning motor, wait for 10s-20s, and then start the chain drawing machine. The horizontal push-pull cylinder in the wire arrangement and pre-bending wheel group is in the retracted state and the vertical lifting cylinder is in the downward state to pull out the copper tube;

[0033] E. Until the copper tube reaches the wire arrangement pre-bending wheel group and is bent into an arc, the lifting cylinder in the chain drawing machine is stopped and the winding machine is restored to the loose state. The chain drawing machine and high-frequency spinning motor are stopped in sequence, and the cooling oil pump motor is stopped after a delay of 10 seconds. At this time, the horizontal push-pull cylinder in the wheel group is still in the retracted state and the vertical lifting cylinder is in the downward state. The reset origin function is activated and the winding machine returns to the default state.

[0034] F. Insert the bent copper tube into the positioning hole of the coiler and start the above step D again to start the production of the coiled internal thread copper tube; at this time, the wire arrangement and pre-bending wheel group starts working until the production is completed;

[0035] G. After production is completed, use packaging tape to bundle the copper tube, loosen the reel, take out the finished product, and complete the work.

[0036] Among them, the working principle of the cable pre-bending wheel group is:

[0037] a) Start winding. After winding one circle, the vertical cylinder 8-2 works to press down. After 1.5 seconds, the horizontal cylinder 8-1 works to pull back and maintain the state.

[0038] b) As the first layer of pipelines are arranged from right to left to the edge of the plate, the vertical lifting cylinder rises and the horizontal push-pull cylinder pushes out;

[0039] c) Arrive at the second layer of pipelines and arrange the lines from left to right. After the first circle is completed, the vertical lifting cylinder works to press down, and after 1.5 seconds, the horizontal push-pull cylinder works to push out.

[0040] d) As the second layer of pipelines are arranged from left to right to the edge of the plate, the vertical lifting cylinder rises and the horizontal push-pull cylinder pulls back;

[0041] e) Repeat step a and keep repeating. Note: The horizontal cylinder pressure is adjusted to 0.18~0.2Mpa, and the vertical cylinder pressure is adjusted to 0.4Mpa.

[0042] The beneficial effects of the present invention are: the stability control of the present invention is simple, which solves the problems of high incidence of linear defects, high material loss rate, high equipment dependence and high maintenance cost in the prior art; it also solves the problems of insufficient automation, winding structure design defects, mechanical structure complexity and energy consumption problems and intelligent control shortcomings of the rewinding machine in actual application. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a structural schematic diagram of an integrated production and winding mechanism for internally threaded copper tubes proposed by the present invention.

[0044] Figure 2 This is a structural schematic diagram of a chain drawing machine in an integrated production and winding mechanism for internally threaded copper tubes proposed by the present invention;

[0045] Figure 3 This is a structural schematic diagram of a wire arrangement and pre-bending wheel assembly in an integrated production and winding mechanism for internally threaded copper tubes proposed by the present invention;

[0046] Figure 4 This is a side view of the wire arrangement and pre-bending wheel assembly in the integrated production and winding mechanism for internally threaded copper tubes proposed by the present invention.

[0047] Numbers in the figure: 1 first base, 2 second base, 3 straightening machine, 4 high-frequency spinning motor, 5 chain drawing machine, 6 wire arrangement pre-bending wheel set, 7 winding machine;

[0048] 501 upper traction chain, 502 lifting cylinder, 503 upper traction motor, 504 lower traction motor, 505 lower traction chain, 506 mounting frame;

[0049] 601 arm lifting cylinder, 602 first slider linear guide, 603 mounting back plate, 604 guide wheel assembly, 605 cable arrangement arm, 606 pre-bending wheel, 607 second slider linear guide, 608 pre-bending cylinder, 609 vertical lifting cylinder, 610 third slider linear guide, 611 horizontal push-pull cylinder. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0051] Reference Figure 1-4 , an integrated production and winding preparation mechanism for internally threaded copper tubes, comprising a first base 1, characterized in that a straightener 3 and a high-frequency spinning motor 4 are fixedly mounted on the upper end of the first base 1, and the high-frequency spinning motor 4 is located on the left side of the straightener 3;

[0052] The second base 2 is fixedly installed on the left end of the first base 1, a chain drawing machine 5 is fixedly installed on the upper end of the second base 2, a wire arrangement pre-bending wheel set 6 is installed on the left end of the chain drawing machine 5, and a winder 7 is installed on the left end of the second base 2.

[0053] In this embodiment, the chain drawing machine 5 includes a mounting frame 506, which is fixedly mounted on the upper end of the second base 2. An upper traction chain 501 and a lower traction chain 505 are mounted on the front end of the mounting frame 506. The upper traction chain 501 is located directly above the lower traction chain 505, and a lifting cylinder 502 is mounted on the upper traction chain 501.

[0054] A lower traction motor 504 and an upper traction motor 503 are fixedly mounted on the front end of the mounting frame 506 . The lower traction motor 504 is connected to the lower traction chain 505 , and the upper traction motor 503 is connected to the upper traction chain 501 .

[0055] The arm lift cylinder 601 includes a mounting back plate 603, which is fixedly mounted on the left end of the mounting frame 506. A guide wheel assembly 604 is mounted on the front end of the mounting back plate 603. The arm lift cylinder 601 is fixedly mounted on the top front end of the mounting back plate 603. A cable arrangement arm 605 is mounted on the lower end of the output end of the arm lift cylinder 601.

[0056] The output end of the arm lifting cylinder 601 is connected to the mounting back plate 603 through the first slider linear guide rail 602.

[0057] A pre-bending cylinder 608 is fixedly mounted on the front end of the top of the mounting back plate 603, and a pre-bending wheel 606 is mounted on the lower end of the output end of the pre-bending cylinder 608;

[0058] The output end of the pre-bending cylinder 608 is connected to the mounting backplate 603 through the second slider linear guide 607. The rear end of the mounting backplate 603 is installed with a vertical lifting cylinder 609. The rear end of the mounting backplate 603 is installed with a horizontal push-pull cylinder 611. The output end of the horizontal push-pull cylinder 611 is connected to the mounting backplate 603 through the third slider linear guide 610.

[0059] In the device provided in this embodiment, the power source of the winder is transmitted from the chain puller through a belt. The application of this method has two advantages: 1. It reduces the investment in the power motor and reduces energy consumption; 2. The belt transmission method can make up for the speed difference caused by the inconsistency during continuous production through the sliding phenomenon between the belt and the wheel group, realize relative synchronization, and thus achieve speed matching.

[0060] Working principle:

[0061] A. Exhaust the raw copper tube for 1 to 3 minutes, then pour a certain amount of copper tube stretching oil from the tube mouth, and insert the floating internal thread core head deep into the tube. At the same time, knock out a concave position about 2 meters away from the tube mouth to prevent the core head from moving;

[0062] B. Place a small iron rod with M4 external thread at the pipe mouth and squeeze it with a heading machine to make it fit tightly with the copper pipe;

[0063] C. After passing the traction rod through the straightening machine, high-frequency spinning motor, chain drawing machine, and cable pre-bending wheel assembly in sequence, twist the small iron rod with M4 external thread in step B to the tail end of the traction rod;

[0064] D. Start the lifting cylinder 502 on the chain drawing machine to press the drawbar, then start the cooling oil pump motor for 5s-10s, start the high-frequency spinning motor 4, wait for 10s-20s, and then start the chain drawing machine 5. The horizontal push-pull cylinder 611 in the wire arrangement pre-bending wheel group 6 is in the retracted state and the vertical lifting cylinder 609 is in the downward state to pull out the copper tube;

[0065] E. When the copper tube reaches the pre-bending wheel assembly 6 and is bent into an arc, the lifting cylinder 502 in the chain drawing machine 5 is stopped, restoring the loose state. The chain drawing machine 5 and the high-frequency spinning motor 4 are stopped in sequence, and the cooling oil pump motor is stopped after a delay of 10 seconds. At this time, the horizontal push-pull cylinder 611 in the wheel assembly is still retracted, and the vertical lifting cylinder 609 is in the downward position. The reset origin function is activated, and the winder 7 returns to its default state.

[0066] F. Insert the bent copper tube into the positioning hole of the coiler 7 and start the above step D again to start the production of the coiled internal thread copper tube. At this time, the wire pre-bending wheel set 6 starts working until the production is completed.

[0067] G. After production is completed, use packaging tape to tie up the copper tube, loosen the reel, take out the finished product, and complete the work.

[0068] Working principle of cable pre-bending wheel set 68:

[0069] a) Start winding. After winding one circle, the vertical cylinder 8-2 works to press down. After 1.5 seconds, the horizontal cylinder 8-1 works to pull back and maintain the state.

[0070] b) As the first layer of pipelines are arranged from right to left to the edge of the plate, the vertical lifting cylinder 609 rises and the horizontal push-pull cylinder 611 pushes out;

[0071] c) Arriving at the second layer of pipelines, the lines are arranged from left to right. The first circle is completed, and the vertical lifting cylinder 609 works to press down. After 1.5 seconds, the horizontal push-pull cylinder 611 works to push out.

[0072] d) As the second layer of pipelines are arranged from left to right to the edge of the plate, the vertical lifting cylinder 609 rises and the horizontal push-pull cylinder 611 pulls back;

[0073] e) Repeat step a and repeat this cycle. Note: The horizontal cylinder pressure is adjusted to 0.18-0.2Mpa, and the vertical cylinder pressure is adjusted to 0.4Mpa.

[0074] The power connection mode of the winder 7 is that its power source comes from the drawing unit, and a common power is achieved through a synchronous belt. There is a slip phenomenon between the belt and the synchronous wheel, thereby compensating for the speed difference between the winding speed and the drawing speed; the tightness of the belt is achieved through the tension adjustment motor, and then the tension control during winding is achieved; the expansion and contraction function of the winding drum utilizes the principle of the existing lathe three-jaw chuck to achieve the contraction function.

[0075] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0076] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified with "first," "second," etc., may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0077] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. An integrated production and winding mechanism for internally threaded copper tubes, comprising a first base (1), characterized in that: A straightening machine (3) and a high-frequency spinning motor (4) are fixedly mounted on the upper end of the first base (1), and the high-frequency spinning motor (4) is located on the left side of the straightening machine (3); A second base (2) is fixedly mounted on the left end of the first base (1), a chain drawing machine (5) is fixedly mounted on the upper end of the second base (2), a wire arrangement pre-bending wheel set (6) is mounted on the left end of the chain drawing machine (5), and a winding machine (7) is mounted on the left end of the second base (2).

2. The internal thread copper tube production and winding integrated preparation mechanism according to claim 1, characterized in that: The chain drawing machine (5) includes a mounting frame (506), the mounting frame (506) is fixedly mounted on the upper end of the second base (2), an upper traction chain (501) and a lower traction chain (505) are mounted on the front end of the mounting frame (506), the upper traction chain (501) is located directly above the lower traction chain (505), and a lifting cylinder (502) is mounted on the upper traction chain (501).

3. The internal thread copper tube production and winding integrated preparation mechanism according to claim 2, characterized in that: A lower traction motor (504) and an upper traction motor (503) are fixedly mounted on the front end of the mounting frame (506); the lower traction motor (504) is connected to a lower traction chain (505); and the upper traction motor (503) is connected to an upper traction chain (501).

4. The internal thread copper tube production and winding integrated preparation mechanism according to claim 1, characterized in that: The arm lifting cylinder (601) includes a mounting back plate (603), the mounting back plate (603) is fixedly mounted on the left end of the mounting frame (506), a guide wheel group (604) is mounted on the front end of the mounting back plate (603), the arm lifting cylinder (601) is fixedly mounted on the front end of the top of the mounting back plate (603), a cable arrangement arm (605) is mounted on the lower end of the output end of the arm lifting cylinder (601), and the output end of the arm lifting cylinder (601) is connected to the mounting back plate (603) via a first slider linear guide rail (602).

5. The internal thread copper tube production and winding integrated preparation mechanism according to claim 4, characterized in that: A pre-bending cylinder (608) is fixedly mounted on the front end of the top of the mounting backplate (603), a pre-bending wheel (606) is mounted on the lower end of the output end of the pre-bending cylinder (608), and the output end of the pre-bending cylinder (608) is connected to the mounting backplate (603) via a second slider linear guide rail (607).

6. The internal thread copper tube production and winding integrated preparation mechanism according to claim 5, characterized in that: A vertical lifting cylinder (609) is installed at the rear end of the mounting back plate (603).

7. The internal thread copper tube production and winding integrated preparation mechanism according to claim 6, characterized in that: A horizontal push-pull cylinder (611) is installed at the rear end of the mounting back plate (603).

8. The integrated production and winding mechanism for internally threaded copper tubes according to claim 7, characterized in that: The output end of the horizontal push-pull cylinder (611) is connected to the mounting back plate (603) via a third slider linear guide rail (610).

9. A method for producing and winding an internally threaded copper tube, utilizing the internally threaded copper tube producing and winding integrated production mechanism according to claim 8, characterized in that: The following steps are involved: A. Exhaust the raw copper tube for 1 to 3 minutes, then pour a certain amount of copper tube stretching oil from the tube mouth, and insert the floating internal thread core head deep into the tube. At the same time, knock out a concave position about 2m away from the tube mouth to prevent the core head from moving; B. Place a small iron rod with M4 external thread at the pipe mouth and squeeze it with a heading machine to make it fit tightly with the copper pipe; C. After passing the traction rod through the straightening machine, high-frequency spinning motor, chain drawing machine, and cable arrangement and pre-bending wheel assembly in sequence, twist the small iron rod with M4 external thread in step B to the tail end of the traction rod; D. Start the lifting cylinder on the chain drawing machine to tighten the drawbar, then start the cooling oil pump motor for 5s-10s, start the high-frequency spinning motor, wait for 10s-20s, and then start the chain drawing machine. The horizontal push-pull cylinder in the wire arrangement and pre-bending wheel group is in the retracted state and the vertical lifting cylinder is in the downward state to pull out the copper tube; E. Until the copper tube reaches the wire arrangement pre-bending wheel group and is bent into an arc, the lifting cylinder in the chain drawing machine is stopped and the winding machine is restored to the loose state. The chain drawing machine and high-frequency spinning motor are stopped in sequence, and the cooling oil pump motor is stopped after a delay of 10 seconds. At this time, the horizontal push-pull cylinder in the wheel group is still in the retracted state and the vertical lifting cylinder is in the downward state. The reset origin function is activated and the winding machine returns to the default state. F. Insert the bent copper tube into the positioning hole of the coiler and start the above step D again to start the production of the coiled internal thread copper tube; at this time, the wire arrangement and pre-bending wheel group starts working until the production is completed; G. After production is completed, use packaging tape to bundle the copper tube, loosen the reel, take out the finished product, and complete the work.

10. The integrated production and winding method for an internally threaded copper tube according to claim 9, characterized in that: The working principle of the cable pre-bending wheel set is: a) Start winding. After winding one circle, the vertical cylinder 8-2 works to press down. After 1.5 seconds, the horizontal cylinder 8-1 works to pull back and maintain the state. b) As the first layer of pipelines are arranged from right to left to the edge of the plate, the vertical lifting cylinder rises and the horizontal push-pull cylinder pushes out; c) Arrive at the second layer of pipelines and arrange the lines from left to right. After the first circle is completed, the vertical lifting cylinder works to press down, and after 1.5 seconds, the horizontal push-pull cylinder works to push out. d) As the second layer of pipelines are arranged from left to right to the edge of the plate, the vertical lifting cylinder rises and the horizontal push-pull cylinder pulls back; e) Repeat step a and keep repeating. Note: The horizontal cylinder pressure is adjusted to 0.18~0.2Mpa, and the vertical cylinder pressure is adjusted to 0.4Mpa.

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