A rapid cooling mechanism for copper wire annealing
Through a multi-stage gradient cooling mechanism, the copper wire is cooled sequentially by heat-conducting oil at different temperatures in a nitrogen environment, which solves the problem of uneven cooling rate of copper wire in traditional cooling methods and achieves a highly efficient copper wire annealing effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HAINAN MEIYA COPPER TECHNOLOGY CO LTD
- Filing Date
- 2025-07-08
- Publication Date
- 2026-07-24
AI Technical Summary
Traditional single-stage rapid cooling results in a large difference in cooling rates between the copper wire surface and the core, which easily leads to thermal stress cracks and affects the uniformity of ductility and conductivity.
A multi-stage gradient rapid cooling mechanism is designed. In a nitrogen environment, the copper wire is cooled sequentially by heat transfer oil at approximately 300°C, 200°C, and room temperature. Uniform and rapid cooling is achieved by using multi-stage water tanks and wire reel sets.
This method achieves uniform and rapid cooling of copper wire, improves the ductility and conductivity of copper wire after annealing, and also increases cooling efficiency.
Smart Images
Figure CN224548487U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of copper wire processing technology, and specifically to a rapid cooling mechanism for copper wire annealing. Background Technology
[0002] During cold working, copper wires experience lattice distortion and work hardening, leading to decreased conductivity and deteriorated ductility. Annealing, through recrystallization, eliminates these defects, significantly restoring the material's properties. The cooling rate, as one of the core parameters of the annealing process, significantly impacts the performance of copper wires by controlling grain growth kinetics.
[0003] Traditional single-stage rapid cooling uses a single cooling temperature, which is highly efficient, but has two major bottlenecks. First, it can lead to a large difference in cooling rate between the copper wire surface and the core, which can easily cause thermal stress cracks and reduce ductility. Second, rapid cooling can cause the surface grains to become finer while the core retains coarse grains, which reduces the uniformity of conductivity distribution and reduces conductivity.
[0004] Therefore, a multi-stage gradient rapid cooling scheme needs to be designed to ensure that the temperature of the copper wire after annealing is cooled uniformly and rapidly, thereby ensuring the ductility and conductivity of the copper wire after annealing while meeting production efficiency requirements. Utility Model Content
[0005] The purpose of this invention is to provide a rapid cooling mechanism for copper wire annealing to solve the problems described in the background art.
[0006] The technical solution of this utility model is implemented as follows:
[0007] A rapid cooling mechanism for copper wire annealing includes a cooling chamber and a cold water source, an inert gas source, and a controller located outside the cooling chamber.
[0008] The cooling chamber contains at least three elongated, straight water tanks with open tops, extending in a front-to-back direction. Each tank contains heat-conducting oil for cooling the copper wires. The tanks are fixedly arranged at intervals from top to bottom. Cooling water pipes and heating rods are installed inside each tank. The inlets of the cooling water pipes are connected to inlet pipes, and the outlets are connected to drain pipes. Both the inlet and drain pipes are sealed and extend out of the cooling chamber, connecting to a cold water source. Electric valves are also installed on the inlet and drain pipes outside the cooling chamber. Temperature sensors are also installed inside the water tanks. The electric valves, temperature sensors, and heating rods are all electrically connected to a controller.
[0009] An air inlet is located at the top of the side wall of the cooling box, and an exhaust outlet is located at the bottom of the side wall. The air inlet is connected to an inert air source via an air inlet pipe, and the exhaust outlet is connected to an exhaust pipe with a valve.
[0010] An inlet pipe is located at the upper end of one side wall of the cooling box, and an outlet pipe is located at the lower end of the other side wall of the cooling box.
[0011] The water tank is also equipped with a reel assembly. After the copper wire enters from the inlet pipe, it is guided by the reel assembly of the water tank and enters the heat transfer oil of each water tank from top to bottom. Finally, it is guided to be removed from the outlet pipe.
[0012] A further technical solution is that the reel assembly includes a first reel, a second reel, and a third reel. There are two first reels, which are rotatably installed inside the water tank at the front and rear ends, respectively. There are also two second reels, which are rotatably installed above the water tank at the front and rear ends, respectively. A second mounting bracket is also fixed to the outer wall of the water tank, and the third reel is rotatably installed on the second mounting bracket.
[0013] A further technical solution is that both the inlet and outlet pipes are equipped with bakelite plugs and ceramic pillars, and both the bakelite plugs and ceramic pillars have through holes for copper wires to pass through.
[0014] A further technical solution is that multiple sets of support plates are fixed in the cooling box, and the multiple sets of support plates are spaced apart from top to bottom. Each set of support plates includes at least two horizontally placed support plates. The two ends of the support plates are fixed to the side wall of the cooling box, and the water tank is fixed on the support plates.
[0015] A further technical solution is that the water tank is equipped with two horizontally arranged first rotating shafts, with the two ends of the first rotating shafts fixed to the left and right walls of the water tank respectively, and the first reel rotatingly sleeved on the first rotating shafts.
[0016] A further technical solution is that two first mounting brackets are fixed on the side wall of the water tank, the upper ends of the two first mounting brackets extend upward to the top of the water tank, and a second rotating shaft is horizontally fixed on the first mounting bracket, the second rotating shaft extends to the top of the water tank, and the second reel is rotated and sleeved on the second rotating shaft.
[0017] A further technical solution is to provide fins on the outer wall of the cooling water pipe.
[0018] A further technical solution is that the heat transfer oil is hydrogenated terphenyl heat transfer oil.
[0019] A further technical solution is to provide a connector at the end of the inlet pipe that faces away from the cooling box.
[0020] The beneficial effects of this utility model are as follows:
[0021] 1. Highly efficient and superior cooling effect: The copper wire is cooled uniformly and rapidly in a nitrogen atmosphere by passing through heat-conducting oil at approximately 300°C, 200°C, and room temperature in sequence. This multi-stage cooling process ensures the ductility and conductivity of the copper wire after annealing.
[0022] 2. Optimization of inlet and outlet pipe details: Both inlet and outlet pipes are equipped with bakelite plugs and ceramic pillars. The bakelite plugs reduce the leakage of internal inert gas, and the ceramic pillars reduce the friction on the outer surface of the copper wire, thereby improving the surface quality of the copper wire.
[0023] 3. Precise guidance of the reel assembly: The reel assembly includes a first reel, a second reel, and a third reel. The different reels have a clear division of labor, ensuring that the copper wire is accurately guided in the water tank and between adjacent water tanks above and below, achieving multi-stage cooling. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the overall design of this utility model;
[0025] Figure 2 for Figure 1 The top sectional view.
[0026] In the diagram, 1. Cooling tank, 2. Support plate, 3. Air inlet, 4. Exhaust outlet, 5. Inlet pipe, 6. Connector, 7. Bakelite plug, 8. Ceramic column, 9. Outlet pipe, 10. Water tank, 11. Cooling water pipe, 12. Heating rod, 13. First shaft, 14. First reel, 15. Second shaft, 16. Second reel, 17. First mounting bracket, 18. Temperature sensor, 19. Second mounting bracket, 20. Third reel, 21. Air tank, 22. Air inlet pipe, 23. Cold water source, 24. Electric valve, 25. Water inlet pipe, 26. Drain pipe. Detailed Implementation
[0027] To better understand the technical content of this utility model, specific embodiments are provided below, and the utility model will be further described in conjunction with the accompanying drawings.
[0028] See Figures 1 to 2 A rapid cooling mechanism for copper wire annealing includes a cooling box 1 and a cold water source 23, an inert gas source, and a controller located outside the cooling box 1.
[0029] Specifically, the controller uses an STM32 microcontroller or a SMART200 PLC controller.
[0030] Specifically, the cold water source 23 can be external tap water, in which case the water pressure of the tap water eliminates the need for a water pump. Alternatively, it can use machine-made cooling water, in which case a water pump is required.
[0031] Specifically, the inert gas source can be connected to the pipeline in the gas source room, or directly connected to the gas tank 21 containing inert gas. Preferably, the inert gas is nitrogen.
[0032] Specifically, the cooling box 1 is a rectangular box with a closable door at the front.
[0033] The cooling chamber 1 contains three elongated, straight water tanks 10 with open tops, extending in a front-to-back direction. Each water tank 10 contains heat-conducting oil for cooling copper wires. The water tanks 10 are fixedly arranged at intervals from top to bottom. Cooling water pipes 11 and heating rods 12 are installed inside each water tank 10. The inlet of each cooling water pipe 11 is connected to an inlet pipe 25, and the outlet of each cooling water pipe 11 is connected to a drain pipe 26. Both the inlet pipe 25 and the drain pipe 26 are sealed and extend out of the cooling chamber 1, connecting to a cold water source 23. Electric valves 24 are also installed on the inlet pipe 25 and the drain pipe 26 outside the cooling chamber 1. A temperature sensor 18 is also installed in each water tank 10. The electric valve 24, the temperature sensor 18, and the heating rods 12 are all electrically connected to a controller.
[0034] An air inlet 3 is provided at the top of the side wall of the cooling box 1, and an exhaust port 4 is provided at the bottom of the side wall of the cooling box 1. The air inlet 3 is connected to an inert air source through an air inlet pipe 22, and an exhaust pipe with a valve is connected to the exhaust port 4.
[0035] A cable inlet pipe 5 is provided at the upper end of one side wall of the cooling box 1, and a cable outlet pipe 9 is provided at the lower end of the other side wall of the cooling box 1.
[0036] The water tank 10 is also equipped with a wire reel assembly. After the copper wire enters from the inlet pipe 5, it is guided by the wire reel assembly of the water tank 10 and enters the heat transfer oil of each water tank 10 from top to bottom. Finally, it is guided to be removed from the outlet pipe 9.
[0037] When using the above scheme, connect the inlet pipe 5 to the outlet of the annealing machine, set the heating temperature in the uppermost water tank 10 to 290-310℃, set the heating temperature in the middle water tank 10 to 190-210℃, and set the heating temperature in the lowermost water tank 10 to 25-30℃.
[0038] Before use, turn on the inert gas source to supply nitrogen to the cooling box 1. Since nitrogen is less dense than air, the air inlet 3 is located at the top and the exhaust port 4 at the bottom to quickly reduce the air content. A valve is installed on the exhaust pipe to adjust the exhaust volume after a period of inflation, saving gas consumption.
[0039] After the copper wire enters the cooling box 1 through the inlet pipe 5, it is guided by the wire wheel assembly to first enter the uppermost water tank 10, then enter the middle water tank 10, and finally enter the lowermost water tank 10. Under nitrogen atmosphere, the copper wire passes through heat transfer oil at about 300°C, then heat transfer oil at about 200°C, and finally heat transfer oil at room temperature. This allows the copper wire to be cooled evenly and quickly. The cooling efficiency is not only high, but the multi-stage stepped cooling also ensures the ductility and conductivity of the copper wire after annealing.
[0040] The heating rod 12 is used to raise the temperature of the heat transfer oil when the temperature is insufficient. The copper wire continuously transfers heat during the cooling process and continuously heats the heat transfer oil. Therefore, the cooling water pipe 11 can prevent the heat transfer oil from rising above the threshold.
[0041] Specifically, the reel assembly includes a first reel 14, a second reel 16, and a third reel 20. There are two first reels 14, which are rotatably installed inside the water tank 10 at the front and rear ends, respectively. There are two second reels 16, which are rotatably installed above the water tank 10 at the front and rear ends, respectively. A second mounting bracket 19 is also fixed to the outer wall of the water tank 10, and the third reel 20 is rotatably installed on the second mounting bracket 19.
[0042] When using the above scheme, the uppermost water tank 10 and the lowermost water tank 10 can each be equipped with only one third wire reel 20, or they can be equipped with two third wire reels 20 at both ends, like the middle water tank 10, but only one is used. The function of the second wire reel 16 is to guide the copper wire into the water tank 10 and to guide the copper wire in the water tank 10 to the outside of the water tank 10. The function of the first wire reel 14 is to allow the copper wire to move a certain distance in the heat transfer oil of the water tank 10. The function of the third wire reel 20 is to guide the copper wire between the upper and lower adjacent water tanks 10.
[0043] Specifically, both the inlet pipe 5 and the outlet pipe 9 are equipped with a bakelite plug 7 and a ceramic pillar 8, and both the bakelite plug 7 and the ceramic pillar 8 have through holes for the copper wire to pass through.
[0044] When using the above scheme, the bakelite plug 7 is used to seal the inlet pipe 5 and outlet pipe 9 to a certain extent, reducing the leakage of internal inert gas, and the ceramic column 8 is used to reduce the friction on the outer surface of the copper wire and improve the surface quality. For specific usage, please refer to the patent document "A Novel Antennae Protection Device for Copper Wire Drawing Machine" with publication number CN212223064U.
[0045] Specifically, multiple sets of support plates 2 are fixed in the cooling box 1. The multiple sets of support plates 2 are arranged at intervals from top to bottom. Each set of support plates 2 includes at least two horizontally placed support plates 2. The two ends of the support plates 2 are fixed to the side wall of the cooling box 1, and the water tank 10 is fixed on the support plates 2.
[0046] When using the above solution, the configuration of the support plate 2 allows for the quick installation of the water tank 10.
[0047] Specifically, the tank is equipped with two horizontally arranged first rotating shafts 13. The two ends of the first rotating shafts 13 are fixed on the left and right side walls of the water tank 10, respectively. The first reel 14 is rotatably sleeved on the first rotating shafts 13.
[0048] Specifically, two first mounting brackets 17 are fixed on the side wall of the water tank 10. The upper ends of the two first mounting brackets 17 extend upward to the top of the water tank 10. A second rotating shaft 15 is also horizontally fixed on the first mounting bracket 17. The second rotating shaft 15 extends upward to the top of the water tank 10. The second reel 16 is rotatably sleeved on the second rotating shaft 15.
[0049] Specifically, fins are also provided on the outer wall of the cooling water pipe 11.
[0050] When using the above method, the fins can increase the heat exchange capacity.
[0051] Specifically, the heat transfer oil is hydrogenated terphenyl heat transfer oil.
[0052] When using the above method, hydrogenated terphenyl heat transfer oil is a high-performance heat transfer oil, capable of heating up to over 340℃, and it does not chemically react with the copper wire during heating. It should be noted that prolonged heating of the hydrogenated terphenyl heat transfer oil will degrade it, so the heat transfer oil needs to be replaced periodically by opening cooling box 1.
[0053] Specifically, the end of the inlet pipe 5 that is away from the cooling box 1 is also equipped with a connector 6.
[0054] When using the above scheme, the connection of the inlet pipe 5 is facilitated by setting the connector 6.
[0055] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A rapid cooling mechanism for copper wire annealing, comprising a cooling chamber and a cold water source, an inert gas source, and a controller disposed outside the cooling chamber, characterized in that: The cooling chamber contains at least three elongated, straight water tanks with open tops, extending in a front-to-back direction. Each tank contains heat-conducting oil for cooling the copper wires. The tanks are fixedly arranged at intervals from top to bottom. Cooling water pipes and heating rods are installed inside each tank. The inlets of the cooling water pipes are connected to inlet pipes, and the outlets are connected to drain pipes. Both the inlet and drain pipes are sealed and extend out of the cooling chamber, connecting to a cold water source. Electric valves are also installed on the inlet and drain pipes outside the cooling chamber. Temperature sensors are also installed inside the water tanks. The electric valves, temperature sensors, and heating rods are all electrically connected to a controller. An air inlet is located at the top of the side wall of the cooling box, and an exhaust outlet is located at the bottom of the side wall. The air inlet is connected to an inert air source via an air inlet pipe, and the exhaust outlet is connected to an exhaust pipe with a valve. An inlet pipe is located at the upper end of one side wall of the cooling box, and an outlet pipe is located at the lower end of the other side wall of the cooling box. The water tank is also equipped with a reel assembly. After the copper wire enters from the inlet pipe, it is guided by the reel assembly of the water tank and enters the heat transfer oil of each water tank from top to bottom. Finally, it is guided to be removed from the outlet pipe.
2. The rapid cooling mechanism for copper wire annealing according to claim 1, characterized in that: The reel assembly includes a first reel, a second reel, and a third reel. There are two first reels, which are rotatably installed inside the water tank at the front and rear ends, respectively. There are also two second reels, which are rotatably installed above the water tank at the front and rear ends, respectively. A second mounting bracket is also fixed to the outer wall of the water tank, and the third reel is rotatably installed on the second mounting bracket.
3. The rapid cooling mechanism for copper wire annealing according to claim 2, characterized in that: Both the inlet and outlet pipes are equipped with bakelite plugs and ceramic posts, and both the bakelite plugs and ceramic posts have through holes for copper wires to pass through.
4. The rapid cooling mechanism for copper wire annealing according to claim 3, characterized in that: Multiple sets of support plates are fixed in the cooling box. The multiple sets of support plates are arranged at intervals from top to bottom. Each set of support plates includes at least two horizontally placed support plates. The two ends of the support plates are fixed to the side wall of the cooling box, and the water tank is fixed on the support plates.
5. A rapid cooling mechanism for copper wire annealing according to claim 4, characterized in that: The water tank is equipped with two horizontally arranged first rotating shafts. The two ends of the first rotating shafts are fixed to the left and right walls of the water tank, respectively. The first reel is rotated and sleeved on the first rotating shaft.
6. A rapid cooling mechanism for copper wire annealing according to claim 5, characterized in that: Two first mounting brackets are also fixed on the side wall of the water tank. The upper ends of the two first mounting brackets extend upward to the top of the water tank. A second rotating shaft is also horizontally fixed on the first mounting bracket. The second rotating shaft extends upward to the top of the water tank. The second reel is rotated and sleeved on the second rotating shaft.
7. A rapid cooling mechanism for copper wire annealing according to claim 1, characterized in that: The outer wall of the cooling water pipe is also equipped with fins.
8. A rapid cooling mechanism for copper wire annealing according to claim 1, characterized in that: The heat transfer oil is hydrogenated terphenyl heat transfer oil.
9. A rapid cooling mechanism for copper wire annealing according to claim 1, characterized in that: A connector is also provided at the end of the inlet pipe away from the cooling box.