Copper conductor rubber coating device and method with anti-oxidation function

Abstract

The present invention belongs to the technical field of cable manufacturing devices, and provides a copper conductor rubber coating device and method with an anti-oxidation function, the rubber coating device comprising: a machine head; a working chamber, which is arranged in the machine head and surrounds the moving path of the copper conductor, and the working chamber is provided with an entry end and a rubber coating end at both ends along the moving path of the copper conductor; an air filling mechanism, which has an air outlet end, and the air outlet end is inserted into the working chamber from the entry end, and is used to provide inert gas to the working chamber. Compared with the prior art, the present invention significantly reduces the oxygen content in the working chamber by filling the working chamber with inert gas before the copper conductor is coated, thereby effectively preventing the copper conductor from high-temperature oxidation during the coating process, which not only reduces material consumption and comprehensive production costs, but also because the inert gas itself will not have a negative impact on the environment, compared with the chemical passivation film method used in the prior art, the risk of environmental pollution is greatly reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of cable manufacturing devices, and in particular relates to a copper conductor rubber coating device and method with an anti-oxidation function. Background Art

[0002] The three-layer co-extrusion process is an advanced plastic processing technology that allows three different materials or different formulations of the same material to be extruded simultaneously in the same production process to form a product with a multi-layer structure. This process is widely used in wires and cables, packaging materials, architectural membranes and other fields.

[0003] In the traditional three-layer co-extrusion cable production process, copper conductor oxidation is a common and thorny problem. In order to meet this challenge, the existing technology usually adopts the following four operation methods to prevent or slow down the oxidation of copper conductors: 1. Material selection: select high-purity copper rods and try to avoid using copper materials containing too much oxide or other impurities to reduce the possibility of oxidation; 2. Physical barrier method: During the storage, transportation and production of copper materials (including copper rods, copper wires and semi-finished products after twisting), physical methods such as plastic film coating are used for sealing protection to ensure that they are stored in a dry environment and speed up the turnover of semi-finished products, thereby reducing the risk of oxidation of the copper surface due to contact with humid air; 3. Chemical passivation film formation: a passivation film is formed on the surface of the copper conductor by chemical reaction, for example, organic compounds such as antioxidant MB and benzotriazole react with copper to form a yellow passivation film, which effectively prevents the oxidation process. In addition, antioxidants are added during the wire drawing process, and the concentration and pH of the emulsion are strictly controlled. At the same time, a blow-drying device is used to ensure that the copper wire is dry and free of residual liquid. For the stranded conductor and extruded insulation process, the surface of the copper conductor is protected by dripping or spraying antioxidants (such as benzotriazole alcohol solution) through an infusion tube. 4. Cathodic protection redox method: Peroxide is used as a cross-linking agent, and the cathodic protection redox mechanism is used to maintain the copper conductor in a reduced state to prevent it from oxidative discoloration.

[0004] Although the above measures can solve the problem of copper conductor oxidation to a certain extent, they also bring several new challenges: 1. High cost: Selecting high-purity copper materials, applying chemical passivation films, and implementing cathodic protection will lead to rising costs. 2. Dependence on environmental conditions and operation quality: The effect of physical barrier methods is easily affected by environmental humidity, temperature changes, and the wrapping effect of operators, and it is difficult to ensure long-term stable protection; 3. Limitations of chemical treatment: The quality of passivation films generated by chemical methods is greatly affected by the concentration ratio of additives, coating uniformity, and stability. Especially in the wire drawing process, the added concentration of antioxidants and the pH of the emulsion will become unstable due to external factors, which not only increases the cost of material consumption and replacement, but also may bring environmental pollution risks. The operation of dripping or spraying antioxidants on the surface of stranded conductors, in addition to large material consumption and high comprehensive costs, also has uneven coating of the inner and outer layers and potential safety hazards.

[0005] In summary, although there are various existing technical means to prevent copper conductor oxidation, they still face many limitations and challenges in practical applications, and further exploration of more economical, efficient and environmentally friendly solutions is needed. Summary of the invention

[0006] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a copper conductor rubber coating device and method with an anti-oxidation function.

[0007] The technical solution adopted by the present invention to solve the technical problem is to provide a copper conductor rubber coating device with anti-oxidation function, comprising: a machine head; A working chamber, which is arranged in the machine head and surrounds the moving path of the copper conductor, and the working chamber is provided with an entry end and a rubber-wrapped end at both ends along the moving path of the copper conductor, the entry end is used for the copper conductor to enter, and the rubber-wrapped end is used for the rubber-wrapped raw material to wrap around the copper conductor; A gas filling mechanism having a gas outlet end, the gas outlet end is inserted into the working chamber from the gas inlet end, and is used to provide inert gas to the working chamber, wherein: The rubber-coated end forms a seal after wrapping the rubber-coated raw material around the outside of the copper conductor, so that the inert gas discharged from the gas outlet end fills the working chamber.

[0008] In the above-mentioned copper conductor rubber coating device with anti-oxidation function, the flow direction of the inert gas when entering the working chamber is the same as the moving direction of the copper conductor.

[0009] The above-mentioned copper conductor rubber coating device with anti-oxidation function also includes a sealing plate, which is arranged on a side of the machine head close to the entry end.

[0010] In the above-mentioned copper conductor rubber coating device with anti-oxidation function, the sealing plate is made of rubber material and is tightly pressed against the outer side wall of the inflation mechanism.

[0011] In the above-mentioned copper conductor rubber coating device with anti-oxidation function, the cross-sectional area of ​​the working chamber is larger than the sum of the cross-sectional area of ​​the air outlet end and the copper conductor.

[0012] In the above-mentioned copper conductor rubber coating device with anti-oxidation function, the inflation mechanism includes a gas pipeline and a flow meter, the gas outlet is arranged at one end of the gas pipeline, the other end of the gas pipeline is connected to the gas source, and the flow meter is used to monitor the gas flow in the gas pipeline.

[0013] In the above-mentioned copper conductor rubber coating device with anti-oxidation function, at least the portion of the gas pipeline extending into the working chamber is a copper pipe.

[0014] In the above-mentioned copper conductor rubber coating device with anti-oxidation function, the inert gas is nitrogen.

[0015] In the above-mentioned copper conductor rubber coating device with anti-oxidation function, the gas source is a nitrogen generator or a liquid nitrogen storage tank.

[0016] The present invention adopts a technical solution to solve the technical problem, and also proposes a method for preventing oxidation of copper conductors during rubber coating. Based on the above copper conductor rubber coating device with anti-oxidation function, the method comprises the following steps: S1. Use a nitrogen generator or liquid nitrogen to provide dry nitrogen as an inert gas source; S2, connect the external dry air source to the head of the encapsulation device through a copper tube; S3, using extruded rubber coating and sealing plates to create a closed space at the head of the machine; S4. By continuously introducing nitrogen into the working chamber, the air in the working chamber is exhausted and the air is prevented from entering the working chamber.

[0017] Compared with the prior art, the present invention has the following beneficial effects: (1) By filling the working chamber with inert gas before the copper conductor is coated, the oxygen content in the working chamber is significantly reduced, thereby effectively preventing the copper conductor from being oxidized at high temperature during the coating process. This not only reduces material consumption and comprehensive production costs, but also greatly reduces the risk of environmental pollution compared to the chemical passivation film method used in the prior art, as the inert gas itself will not have a negative impact on the environment. (2) By introducing the inert gas into the working chamber and making its flow direction the same as the movement direction of the copper conductor, this setting not only helps to evacuate the oxygen in the working chamber to the maximum extent, but also effectively reduces the amount of inert gas used; (3) The flow meter is used to adjust and monitor the flow of inert gas into the working chamber to ensure that only the right amount of gas is introduced, thereby achieving the purpose of isolating oxygen and avoiding unnecessary waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a plan view of a copper conductor rubber coating device with anti-oxidation function in the present scheme; Figure 2 yes Figure 1 Sectional view in .

[0019] In the figure, 100, head; 200, working chamber; 210, entry end; 220, rubber-coated end; 300, inflation mechanism; 310, gas pipeline; 320, flow meter; 330, gas flow direction; 400, sealing plate; 500, copper conductor; 510, moving direction of copper conductor. DETAILED DESCRIPTION

[0020] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0021] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0022] like Figure 1 to Figure 2 As shown, a copper conductor rubber coating device with anti-oxidation function of the present solution includes: a head 100, a working chamber 200, and an inflation mechanism 300.

[0023] Specifically, the working chamber 200 is arranged in the head 100 and surrounds the moving path of the copper conductor 500. The working chamber 200 is provided with an entry end 210 and a rubber-coated end 220 at both ends along the moving path of the copper conductor 500. The entry end 210 is used for the copper conductor 500 to enter, and the rubber-coated end 220 is used for the rubber-coated raw material to be wrapped on the copper conductor 500; the inflation mechanism 300 has a gas outlet end, which is inserted into the working chamber 200 from the entry end 210, and is used to provide inert gas to the working chamber 200, wherein the rubber-coated end 220 wraps the rubber-coated raw material on the outside of the copper conductor 500 and then forms a seal on the rubber-coated end 220, so that the inert gas discharged from the gas outlet end fills the working chamber 200.

[0024] During operation, the copper conductor 500 moves relative to the machine head 100 driven by a power device (not shown in the figure). When the copper conductor 500 moves to the rubber-coated end 220, the rubber-plastic material is squeezed into the rubber-coated end 220 through the rubber inlet provided on the machine head 100 to coat the copper conductor 500. During the movement of the copper conductor 500, the gas-charging mechanism 300 injects inert gas into the working chamber 200 through the gas outlet end inserted in the working chamber 200, and discharges the air (including oxygen) in the working chamber 200, so as to suppress the oxygen content in the working chamber 200 and prevent the copper conductor 500 from undergoing oxidation reaction during the coating process.

[0025] At the same time, when the copper conductor 500 is wrapped with the rubber-plastic material, the rubber-plastic material on the outside of the copper conductor 500 is in close contact with the rubber-coated end 220 to form a seal, which effectively reduces the escape of inert gas and reduces the amount of inert gas used, thereby helping to reduce the cost of the copper conductor 500 coating process.

[0026] It is worth noting that although the three-layer co-extrusion process is a relatively well-known technology, the focus of this solution is how to reduce the oxygen content in the working chamber 200 by filling inert gas before the copper conductor 500 is coated, so as to prevent the copper conductor 500 from being oxidized during the coating process. Therefore, the specific feeding method and coating process of the rubber and plastic materials are not described in detail.

[0027] This solution significantly reduces the oxygen content in the working chamber 200 by filling the working chamber 200 with inert gas before coating the copper conductor 500, thereby effectively preventing the copper conductor 500 from being oxidized during the coating process. This not only reduces material consumption and overall production costs, but also, because the inert gas itself will not have a negative impact on the environment, the risk of environmental pollution is greatly reduced compared to the chemical passivation film method used in the prior art.

[0028] In one embodiment, the flow direction of the inert gas when entering the working chamber 200 is the same as the moving direction of the copper conductor 500 .

[0029] This solution mainly uses inert gas to fill the working chamber 200 to reduce the oxygen content in the working chamber 200, thereby preventing the copper conductor 500 from being oxidized during the coating process. When the copper conductor 500 moves relative to the head 100 and is coated, since the surface of the copper conductor 500 has been wrapped with rubber and plastic material, the coated end of the working chamber 200 can be relatively sealed. In order to ensure that as much oxygen in the working chamber 200 as possible is discharged before the copper conductor 500 is coated, and the inert gas is allowed to escape from the entry end 210 only after the working chamber 200 is fully filled, in this solution, the inert gas is introduced into the working chamber 200, and its flow direction is the same as the moving direction of the copper conductor 500. This setting not only helps to maximally empty the oxygen in the working chamber 200, but also effectively reduces the amount of inert gas used.

[0030] The present solution further includes a sealing plate 400 , which is disposed on a side of the nose 100 close to the entry end 210 .

[0031] When the inert gas fills the working chamber 200, due to the open structure of the inlet end 210, some inert gas will still escape from the inlet end 210 into the air. In order to ensure that the copper conductor 500 is not oxidized when the rubber and plastic material is coated, the inert gas must be continuously added to the working chamber 200 through the gas filling mechanism 300. The setting of the sealing plate 400 can reduce the opening size of the inlet end 210, so that the working chamber 200 forms a relatively closed space, thereby reducing the escape of the inert gas and preventing the outside air from entering, so as to maintain the low oxygen environment in the working chamber 200.

[0032] Preferably, the sealing plate 400 is made of rubber material and is tightly pressed against the outer wall of the inflation mechanism 300 .

[0033] The sealing plate 400 not only fits tightly to the outer wall of the copper conductor 500 and the inflation mechanism 300 to ensure the airtightness of the working chamber 200, but also can effectively reduce the opening size of the entry end 210 without affecting the smooth movement of the copper conductor 500.

[0034] The sealing plate 400 is in close contact with the outer side wall of the inflation mechanism 300 to form an effective sealing barrier to prevent external air from penetrating into the working chamber 200 and reduce the escape of the inert gas.

[0035] In order to minimize the opening size of the entry end 210 without affecting the normal movement of the copper conductor 500 and the extension of the inflation mechanism 300 into the working chamber 200, the design of the sealing plate 400 has been carefully considered. Its flexible rubber material allows the sealing plate 400 to adapt to the movement path of the copper conductor 500 while maintaining a tight seal, thereby ensuring stability and reliability during operation.

[0036] Although the sealing plate 400 plays a key sealing role, its elastic properties ensure that the copper conductor 500 can slide freely in the working chamber 200 without being hindered or damaged by friction due to the presence of the sealing plate 400 .

[0037] By reducing the escape of inert gas, the sealing plate 400 helps maintain a low oxygen environment in the working chamber 200, reduces the risk of oxidation of the copper conductor 500, and also reduces the amount of inert gas used, thereby reducing production costs. In addition, since the sealing plate 400 can effectively prevent the entry of outside air, the safety and operating efficiency of the entire system are further improved.

[0038] In summary, the sealing plate 400 is not only a key component to achieve the airtightness of the working chamber 200, but also an important means to ensure the anti-oxidation effect during the coating process of the copper conductor 500. Its design fully considers the actual operation requirements, ensures the sealing performance, and takes into account the smooth movement of the copper conductor 500, providing strong support for improving the production process level.

[0039] In the present embodiment, the cross-sectional area of ​​the working chamber 200 is larger than the sum of the cross-sectional areas of the air outlet end and the copper conductor 500. This design is to ensure that when the inflation mechanism 300 is inserted into the working chamber 200 from the entry end 210, there is sufficient gap between the inflation mechanism 300 and the copper conductor 500 to prevent the portion of the inflation mechanism 300 extending into the working chamber 200 from affecting the movement of the copper conductor 500.

[0040] In one embodiment, the inflation mechanism 300 includes a gas pipeline 310 and a flow meter 320 . The gas outlet is arranged at one end of the gas pipeline 310 . The other end of the gas pipeline 310 is connected to a gas source. The flow meter 320 is used to monitor the gas flow in the gas pipeline 310 .

[0041] One of the main functions of the flowmeter 320 is to accurately control the flow of the inert gas. By adjusting and monitoring the flow of the inert gas entering the working chamber 200, it is ensured that only an appropriate amount of gas is introduced, which not only achieves the purpose of isolating oxygen, but also avoids unnecessary waste. This precise flow control is essential for maintaining a stable low-oxygen environment in the working chamber 200, because too much or too little inert gas will affect the anti-oxidation effect. Because too much inert gas not only increases the cost, but also may cause the temperature of the head 100 to drop and affect the extrusion effect. In addition, the gas pressure is too high, which imposes an additional burden on the equipment; too little inert gas cannot effectively empty the oxygen in the working chamber 200, resulting in the copper conductor 500 may still be oxidized.

[0042] The flow meter 320 helps maintain the stability of the inert gas flow in the working chamber 200. During the movement of the copper conductor 500, the continuous and uniform gas flow can ensure that the oxygen content in the entire working chamber 200 is always kept at a low level, thereby providing a stable anti-oxidation environment. This is very important for ensuring the quality consistency of the copper conductor 500 throughout the coating process.

[0043] By using the flow meter 320 to accurately manage the amount of inert gas used, the consumption of inert gas can be minimized without affecting the anti-oxidation effect. This not only reduces production costs, but also improves the economic benefits of production. In addition, since the use of inert gas is more efficient, the frequency of changing the gas source is reduced, further improving the overall efficiency of the production line.

[0044] The flow meter 320 can also help operators monitor the flow of inert gas in real time to ensure that it is within a safe range. Especially when it comes to inert gases such as nitrogen that may cause suffocation risks, accurate flow control can prevent safety hazards caused by gas leakage or overfilling. At the same time, by cooperating with the ventilation system of the cross-linking main control room, it ensures air circulation in the working environment, maintains sufficient oxygen concentration, and ensures the safety of operators.

[0045] Preferably, at least the portion of the gas pipeline 310 extending into the working chamber 200 is a copper tube.

[0046] Copper material itself has good corrosion resistance, especially when in contact with dry inert gas, it is not easy to chemically react or be corroded. This ensures that in long-term use, the copper tube can maintain its integrity and function and will not be damaged by gas delivery. This corrosion resistance is essential to maintain the stable operation of the system.

[0047] In addition, copper has good thermal stability and can maintain its physical and chemical properties within a certain temperature range. The copper conductor 500 coating process usually involves high temperatures, and the copper tube can work stably in this environment without affecting the quality of gas transmission due to temperature changes. This feature ensures that even under high temperature conditions, the inert gas can be smoothly transported to the designated location without causing damage to the copper tube itself.

[0048] Preferably, the inert gas is nitrogen, and the gas source is a nitrogen generator or a liquid nitrogen storage tank.

[0049] In another embodiment, a method for preventing oxidation of a copper conductor 500 during encapsulation is also provided, the method comprising the steps of: S1. Use a nitrogen generator or liquid nitrogen to provide dry nitrogen as an inert gas source; S2, connect the external dry air source to the head of the encapsulation device through a copper tube; S3, using extruded rubber coating and sealing plates to create a closed space at the head of the machine; S4. Air in the working chamber 200 is exhausted by continuously introducing nitrogen into the working chamber 200, and air is prevented from entering the working chamber 200.

[0050] It should be noted that in the present invention, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. The terms "connected", "fixed", etc. should be understood in a broad sense. For example, "fixed" can be a fixed connection, a detachable connection, or an integral whole; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0051] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0052] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A copper conductor rubber coating device with anti-oxidation function, characterized in that: include: Nose; A working chamber, which is arranged in the machine head and surrounds the moving path of the copper conductor, and the working chamber is provided with an entry end and a rubber-wrapped end at both ends along the moving path of the copper conductor, the entry end is used for the copper conductor to enter, and the rubber-wrapped end is used for the rubber-wrapped raw material to wrap around the copper conductor; A gas filling mechanism having a gas outlet end, the gas outlet end is inserted into the working chamber from the gas inlet end, and is used to provide inert gas to the working chamber, wherein: The rubber-coated end forms a seal after wrapping the rubber-coated raw material around the outside of the copper conductor, so that the inert gas discharged from the gas outlet end fills the working chamber.

2. A copper conductor rubber coating device with anti-oxidation function as claimed in claim 1, characterized in that: The flow direction of the inert gas when entering the working chamber is the same as the moving direction of the copper conductor.

3. The copper conductor rubber coating device with anti-oxidation function as claimed in claim 1, characterized in that: It also includes a sealing plate, which is arranged on a side of the head close to the entry end.

4. A copper conductor rubber coating device with anti-oxidation function as claimed in claim 3, characterized in that: The sealing plate is made of rubber material and is tightly pressed against the outer side wall of the inflation mechanism.

5. The copper conductor rubber coating device with anti-oxidation function as claimed in claim 1, characterized in that: The cross-sectional area of ​​the working chamber is greater than the sum of the cross-sectional areas of the gas outlet end and the copper conductor.

6. The copper conductor rubber coating device with anti-oxidation function as claimed in claim 1, characterized in that: The inflation mechanism comprises a gas pipeline and a flow meter, the gas outlet is arranged at one end of the gas pipeline, the other end of the gas pipeline is connected to a gas source, and the flow meter is used to monitor the gas flow in the gas pipeline.

7. A copper conductor rubber coating device with anti-oxidation function as claimed in claim 6, characterized in that: At least the portion of the gas pipeline extending into the working chamber is a copper pipe.

8. The copper conductor rubber coating device with anti-oxidation function as claimed in claim 1, characterized in that: The inert gas is nitrogen.

9. The copper conductor rubber coating device with anti-oxidation function as claimed in claim 6, characterized in that: The gas source is a nitrogen generator or a liquid nitrogen storage tank.

10. A method for preventing oxidation of a copper conductor during coating, based on the copper conductor coating device with anti-oxidation function as claimed in any one of claims 1 to 9, characterized in that: Includes steps: S1. Use a nitrogen generator or liquid nitrogen to provide dry nitrogen as an inert gas source; S2, connect the external dry air source to the head of the encapsulation device through a copper tube; S3, using extruded rubber coating and sealing plates to create a closed space at the head of the machine; S4. By continuously introducing nitrogen into the working chamber, the air in the working chamber is exhausted and the air is prevented from entering the working chamber.

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