Tinned copper stranded wire and production process thereof
By placing a flexible sleeve on the peripheral copper wire of the tinned copper strand and performing specific cutting, deployment and fixing treatment, the problem of loosening of traditional tinned copper strands is solved, achieving higher bonding density and production efficiency.
Patent Information
- Application Number
- CN202510286506.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-12
- Publication Date
- 2025-05-23
AI Technical Summary
Traditional tin-plated copper strands are prone to loosening when subjected to external forces, which affects their mechanical properties and stability. The traditional clamping fixing method is cumbersome, costly and affects flexibility.
A tin-plated copper stranded wire is designed, and a flexible sleeve is placed on the peripheral copper wire. The flexible sleeve is provided with a cut-out part away from the center of the stranded wire. After being cut, it can be expanded to both sides and fixedly connected. The overlapping part is folded and tilted to fix it on the outer surface of the copper wire.
Effectively prevent the copper wire from loosening, improve the bonding density between the copper wires, maintain the flexibility of the stranded wire, simplify the production process, improve production efficiency and reduce costs.
Smart Images
Figure CN120032944A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of electric wires and cables, in particular to a tinned copper stranded wire and a production process thereof. Background Art
[0002] In the wire and cable industry, tinned copper stranded wire is an important conductive material and is widely used in various electrical connections, power transmission and communication lines. Traditional tinned copper stranded wire is usually made of several copper wires twisted together, and then tinned to improve its corrosion resistance and conductivity. However, in actual use, tinned copper stranded wire often faces a key problem, that is, the copper wire is prone to loosening when subjected to external force, which not only affects the appearance of the stranded wire, but also reduces its mechanical properties and stability. In severe cases, it may even cause electrical connection failure or power transmission interruption.
[0003] To solve this problem, traditional methods usually use clamps and other fixings to tighten the copper wire to prevent it from loosening. However, this method has many shortcomings. First, the installation process of fixings such as clamps is relatively cumbersome, requiring additional operating steps and man-hours, which reduces production efficiency. Secondly, the use of fixings such as clamps increases material costs, and may lose their fixing effect due to loosening or damage during use. In addition, when the stranded wire is subjected to external force in the tightening direction, the traditional clamp structure may also form a certain blocking force, affecting the flexibility of the stranded wire.
[0004] Therefore, there is an urgent need for a novel tinned copper stranded wire structure and its production process, which can effectively prevent the copper wire from loosening and maintain the flexibility of the stranded wire, while simplifying the production process, improving production efficiency and reducing costs. Summary of the invention
[0005] The invention aims to provide a tinned copper stranded wire and a production process thereof, aiming to enhance the anti-loosening capability of the stranded wire and the bonding tightness between copper wires through special design and treatment.
[0006] The above technical objectives of the present invention are achieved through the following technical solutions: a tinned copper stranded wire, comprising a plurality of copper wires twisted into strands, each of the copper wires located at the periphery being sheathed with a flexible sheath; The flexible sleeve is provided with a cuttable portion at one end away from the center of the tinned copper stranded wire. After being cut, the flexible sleeve can be unfolded to both sides. The adjacent unfolded flexible sleeves are fixedly connected to each other through their unfolded ends, and the fixed connection parts are overlapped and located in the gaps between the adjacent copper wires. The overlapping parts are folded and fixed on the outer surface of the outer copper wire at an angle, and the inclination direction is consistent with the twisting direction of the copper wire.
[0007] In some embodiments, the flexible sleeve is a multi-layer structure, including at least two layers bonded to each other.
[0008] In some embodiments, the flexible sleeve is a multi-layer structure formed by winding copper sheets, each layer of the copper sheets is fixedly connected by tight fitting or welding, and the surface of at least one layer of the copper sheets is provided with a texture or coating that increases friction.
[0009] In some embodiments, the cut portion of the flexible sleeve is provided with a tear line or a weakened area.
[0010] A production process for tinned copper stranded wire, the production process is used to make the above-mentioned tinned copper stranded wire, comprising the following steps: a) Copper wire preparation: Select the copper wire of the predetermined quantity and specification, and ensure that the surface of the copper wire is smooth and undamaged; b) Flexible sleeve installation: Flexible sleeves are installed on each copper wire located on the periphery one by one; c) Twisting process: twisting the copper wires with the flexible sleeves according to a predetermined twisting method; d) Cutting and unfolding of the flexible sleeve: After the twisting is completed, cut the end of each flexible sleeve away from the center of the copper stranded wire so that the flexible sleeve can be unfolded to both sides; e) Fixing and fitting of flexible sleeves: The ends of the adjacent unfolded flexible sleeves are fixedly connected to each other, and the fixed connection parts are overlapped and located in the gaps between adjacent copper wires. Then, the overlapped parts are folded and fixed obliquely on the outer surface of the outer copper wires, and the inclination direction is consistent with the twisting direction of the copper wires. f) Tinning treatment: Tinning treatment is performed on the stranded copper wires; g) Inspection and packaging: The finished tinned copper stranded wire is subjected to quality inspection. After passing the inspection, the tinned copper stranded wire is packaged.
[0011] In some embodiments, after step e and before step f, the following steps are further included: e1) Shaping and shaping: Shaping treatment: Use a shaping mold to shape the flexible sleeve that is folded and tilted and fixed on the outer surface of the outer copper wire, put the stranded wire into the shaping mold, and apply and maintain pressure; Shaping treatment: After shaping treatment, the strands are moved to the shaping device, where a restraining force is applied to the strands to keep the flexible sleeve in the shaped shape and position, and the strands are placed in the shaping device until the flexible sleeve is fully shaped.
[0012] In some embodiments, the tin plating process in step f specifically includes the following sub-steps: f1) Pretreatment: Before tinning, the stranded copper wire is cleaned to remove surface oil, oxide layer and impurities; f2) Electroplating tin: The cleaned copper strands are immersed in a plating solution containing tin ions, with the cathode as the cathode and the anode in the plating solution forming an electrolytic circuit, so that the tin ions are deposited on the surface of the copper strands to form a uniform and dense tin-plated layer; f3) Post-plating treatment: After the electroplating is completed, the copper strands are taken out of the electroplating solution for cleaning and drying; f4) Quality inspection: Perform visual inspection on the tinned copper strands, measure the thickness of the tinning layer, and test the bonding strength of the tinning layer.
[0013] Compared with the prior art, the present invention has the following beneficial effects: The flexible sleeve in the present invention forms a structure similar to a clamp after being fixed, but unlike the traditional clamp, it is achieved by unfolding and fixing the flexible sleeve, and no additional clamp parts are required. This structure can effectively prevent the copper wire from loosening when it is subjected to external force in the loosening direction. Moreover, the overlapping parts of the unfolded ends of adjacent flexible sleeves are folded and fixed on the outer surface of the outer copper wire at an angle, and the inclination direction is consistent with the twisting direction of the copper wire. This design ensures that when the copper wire is further tightened in the tightening direction, the flexible sleeve will not form an obstructive force, thereby maintaining the flexibility of the twisted wire; and when the copper wire is twisted in the loosening direction, the flexible sleeve will block the movement of the copper wire, effectively preventing the copper wire from loosening.
[0014] The portion of the copper wire covered with the flexible sleeve is equivalent to being thickened, that is, the outer diameter is increased. Therefore, when the same force is used for twisting, the copper wire at the portion covered with the flexible sleeve will be subjected to a greater extrusion force, and a greater interaction force will be formed between the copper wires, thereby effectively improving the bonding tightness between the copper wires. This improvement in bonding tightness is of great significance for improving the mechanical properties and stability of the stranded wire.
[0015] The present invention only needs to install flexible sleeves on each peripheral copper wire before twisting the copper wires, and then move each flexible sleeve to the same position to immediately carry out the twisting process. After the twisting is completed, each flexible sleeve only needs to be cut open, fixed and combined, and then the flexible sleeve is attached and formed on the outer surface of each peripheral copper wire in the twisting direction, which will not affect the efficiency of the twisting process. Compared with the traditional method of using clamps and other fixing parts, the production process of the present invention is simpler and faster, and the production efficiency is significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a schematic diagram of the structure of the tinned copper stranded wire of Example 1 of the present invention when it is not completely twisted into strands (a flexible sleeve is sheathed on the outer copper wire, but the flexible sleeve is not cut open); Figure 2 for Figure 1 A schematic cross-sectional view of the structure shown; Figure 3 Schematic diagram of the structure of the tinned copper stranded wire after being completely twisted into strands according to Example 1 of the present invention (a flexible sleeve is sheathed on the outer copper wire, but the flexible sleeve is not cut open); Figure 4 for Figure 3 A schematic cross-sectional view of the structure shown; Figure 5 This is a schematic diagram of the structure of the tinned copper stranded wire according to Example 1 of the present invention after being completely twisted into strands (a flexible sleeve is sheathed on the outer copper wire, and the flexible sleeve is cut open); Figure 6 for Figure 5 A schematic cross-sectional view of the structure shown (when the adjacent cut flexible sleeves are not combined together); Figure 7 for Figure 5 A schematic cross-sectional view of the structure shown (when adjacent cut flexible sleeves are combined together); Figure 8 This is a schematic diagram of the structure of the tinned copper stranded wire after being completely twisted into strands according to Example 1 of the present invention (when the cut flexible sleeve is fitted and formed on the outer copper wire surface in the same clockwise direction); Fig. 9 for Figure 8 A schematic cross-sectional view of the structure shown; Fig.10 This is a schematic structural diagram of a flexible sleeve of a tinned copper stranded wire according to Embodiment 2 of the present invention; Fig.11 This is a schematic structural diagram of the combination of the flexible sleeve and the copper wire of the tinned copper stranded wire according to Example 2 of the present invention (after the flexible sleeve on the copper wire is cut open).
[0017] In the figure: 1. Copper wire; 2. Flexible sleeve. DETAILED DESCRIPTION
[0018] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.
[0019] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the 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 cannot be understood as a limitation on the present invention.
[0020] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0021] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0022] Example 1 See also Figure 1-9 , this embodiment provides a tinned copper stranded wire, comprising a plurality of copper wires 1 twisted into strands, each of the copper wires 1 located at the periphery is sheathed with a flexible sheath 2; The flexible sleeve 2 is provided with a cuttable portion at one end away from the center of the tinned copper stranded wire. After being cut, the flexible sleeve 2 can be unfolded to both sides. The adjacent unfolded flexible sleeves 2 are fixedly connected to each other through their unfolded ends, and the fixed connection parts are overlapped and located in the gaps between the adjacent copper wires 1. The overlapping parts are folded and fixed obliquely on the outer surface of the outer copper wire 1 , and the oblique direction is consistent with the twisting direction of the copper wire 1 .
[0023] The flexible sleeve 2 in the tinned copper stranded wire of the present invention forms a structure similar to a clamp after being fixed, but unlike the traditional clamp, it is achieved by unfolding and fixing the flexible sleeve 2, without the need for an additional clamp component. This structure can effectively prevent the copper wire 1 from loosening when subjected to an external force in a loosening direction.
[0024] Furthermore, because the overlapping parts of the unfolded ends of the adjacent flexible sleeves 2 are folded and fixed obliquely to the outer surface of the outer copper wire 1, and the oblique direction is consistent with the twisting direction of the copper wire 1, when the copper wire 1 is further tightened in the tightening direction, the flexible sleeve 2 will not form a blocking force, thereby maintaining the flexibility of the twisted wire. When the copper wire 1 is twisted in the loosening direction, the flexible sleeve 2 will block the movement of the copper wire 1, thereby effectively preventing the copper wire 1 from loosening.
[0025] In addition, the portion of the copper wire 1 covered with the flexible sleeve 2 is equivalent to being thickened, that is, the outer diameter is increased, so when the same force is used for twisting, the copper wire 1 covered with the flexible sleeve 2 will be subjected to a greater extrusion force, and a greater interaction force will be formed between the copper wires 1, thereby effectively improving the bonding tightness between the copper wires 1. This improvement in bonding tightness is of great significance for improving the mechanical properties and stability of the stranded wire.
[0026] In order to prevent the copper wires 1 from loosening, the present invention adopts a structure that is completely different from the traditional clamp, but can achieve the same effect as the clamp. The present invention only needs to set a flexible sleeve 2 on each peripheral copper wire 1 before the copper wires 1 are twisted, and then move each flexible sleeve 2 to the same position to immediately carry out the twisting process. After the twisting is completed, each flexible sleeve 2 only needs to be cut open, fixed and combined one by one, and then the flexible sleeve 2 is bonded and formed on the outer surface of each peripheral copper wire 1 in the twisting direction, which will not affect the efficiency of the twisting process. Therefore, the tinned copper stranded wire proposed by the present invention significantly enhances the anti-loosening ability of the stranded wire and the bonding tightness between the copper wires 1 by introducing the design of the flexible sleeve 2 and performing specific cutting, unfolding, fixing and bonding treatments on it. At the same time, the simplified operation process improves production efficiency, making the present invention have higher practicality and application value.
[0027] When the present invention is used, its working principle is mainly based on the design and action mechanism of the flexible sleeve 2. In the process of manufacturing the stranded wire, firstly, a plurality of copper wires 1 are selected, and the flexible sleeves 2 are sleeved on each of the copper wires 1 located at the periphery. Then, each flexible sleeve 2 is moved to the same position to perform the stranding process. In the stranding process, since the part sleeved with the flexible sleeve 2 is thickened, it is subjected to a greater extrusion force, so that the bonding tightness between the copper wires 1 is improved.
[0028] After the twisting is completed, each flexible sleeve 2 is cut open so that they are spread out to both sides. Then, the ends of the adjacent spread flexible sleeves 2 are fixed together, and the fixed ends are overlapped and located between the adjacent copper wires 1. Next, the overlapping part located between the adjacent copper wires 1 is folded and fixed on the outer surface of the copper wire 1, forming a structure similar to a hoop. This structure can effectively prevent the copper wire 1 from loosening when subjected to an external force in a loosening direction.
[0029] At the same time, since the clockwise direction of the inclination of the flexible sleeve 2 is the same as the twisting direction of each copper wire 1, when the copper wire 1 is further tightened in the tightening direction, the flexible sleeve 2 will not form a blocking force; and when the copper wire 1 is twisted in the loosening direction, the flexible sleeve 2 will block the movement of the copper wire 1, thereby effectively preventing the loosening of the copper wire 1. This design not only ensures the flexibility of the stranded wire, but also improves its anti-loosening ability.
[0030] Preferably, the cut portion of the flexible sleeve 2 is provided with a tear line or a weakened area to facilitate the cutting operation and ensure that the edges after cutting are neat. This design makes it easier and more convenient to cut the flexible sleeve 2. The operator can accurately and quickly cut the flexible sleeve 2 along the tear line or the weakened area without using excessive force or special tools, which greatly improves the operating efficiency. Moreover, the design of the tear line or the weakened area not only facilitates the cutting operation, but also ensures that the edges of the flexible sleeve 2 after cutting are neat and smooth. This helps to achieve a tighter fit and a stronger bond when the unfolded ends of adjacent flexible sleeves 2 are fixedly connected to each other later, thereby improving the overall stability and anti-loosening ability of the stranded wire.
[0031] This embodiment also provides a production process for tinned copper stranded wire, which is used to make the above-mentioned tinned copper stranded wire, and includes the following steps: a) Preparation of copper wire 1: Select copper wire 1 of predetermined quantity and specification, ensure that the surface of copper wire 1 is smooth and undamaged, and pre-treat copper wire 1 as needed, such as cleaning and degreasing, to improve the quality of subsequent processes; b) Flexible sleeve 2 installation: Flexible sleeve 2 is installed on each copper wire 1 located at the periphery one by one, ensuring that the flexible sleeve 2 can fit tightly to the surface of the copper wire 1 and the position is accurate, so as to prepare for the subsequent twisting process; c) Twisting process: The copper wire 1 with the flexible sleeve 2 is twisted in a predetermined twisting mode to form a preliminary copper stranded wire structure. During the twisting process, due to the presence of the flexible sleeve 2, the part with the flexible sleeve 2 is subjected to a greater extrusion force, thereby enhancing the bonding tightness between the copper wires 1; d) Cutting and unfolding of the flexible sleeve 2: After the twisting is completed, use a special tool to cut the end of each flexible sleeve 2 away from the center of the copper stranded wire so that the flexible sleeve 2 can be unfolded to both sides. When cutting, pay attention to controlling the cutting depth and position to ensure that the flexible sleeve 2 can be smoothly unfolded and fixed; e) Fixing and fitting of the flexible sleeve 2: The ends of the adjacent unfolded flexible sleeves 2 are fixedly connected to each other, and the fixed connection parts are overlapped and located in the gaps between the adjacent copper wires 1. Then, the overlapping parts are folded and fixed obliquely on the outer surface of the outer copper wire 1, and the oblique direction is consistent with the twisting direction of the copper wire 1. This step is the key to forming a structure similar to a hoop, which can effectively prevent the copper wire 1 from loosening; f) Tinning: Tinning is performed on the stranded copper wire to improve its corrosion resistance and conductivity. During the tinning process, the thickness and uniformity of the tinning layer must be controlled to ensure product quality; g) Inspection and packaging: The finished tinned copper strands are inspected for quality, including appearance inspection, dimension measurement, mechanical property testing, etc., to ensure that the products meet the design requirements. After passing the inspection, the tinned copper strands are packaged for storage and transportation.
[0032] Through the above production process, tinned copper stranded wire with excellent anti-loosening ability and high bonding tightness can be produced to meet the needs of various application occasions. At the same time, the production process is simple to operate, high in efficiency, and suitable for large-scale industrial production.
[0033] Preferably, after step e and before step f, the method further comprises the following steps: e1) Shaping and shaping: Plastic processing: A shaping die is used to shape the flexible sleeve 2 that is folded and tilted and fixed on the outer surface of the outer copper wire 1. The design of the shaping die should match the shape of the stranded wire to ensure that the flexible sleeve 2 can be evenly stressed and shaped into a desired shape.
[0034] Place the stranded wire into the shaping mold and apply appropriate pressure to make the flexible sleeve 2 fit tightly and evenly on the outer copper wire 1 to eliminate any wrinkles or unevenness.
[0035] The pressure is maintained for a period of time to ensure that the flexible sleeve 2 is fully shaped.
[0036] Styling treatment: After the shaping process, the strands are moved to a shaping device, which can be a groove or a fixture that matches the strand profile and is used to fix the shape of the flexible sleeve 2.
[0037] In the shaping device, appropriate restraining force is applied to the twisted wires to maintain the shape and position of the flexible sleeve 2 after shaping.
[0038] The stranded wire is placed in the shaping device for a period of time to allow the flexible sleeve 2 to be fully shaped, ensuring that it is not easily deformed or loosened during use.
[0039] Through the shaping and finalizing steps, the flexible sleeve 2 is precisely shaped into the desired shape and fits tightly and evenly on the outer copper wire 1. The finalizing treatment ensures the stability of the flexible sleeve 2 during subsequent use and effectively improves the anti-loosening ability and overall quality of the tinned copper stranded wire.
[0040] Preferably, the tinning treatment in step f specifically includes the following sub-steps: f1) Pretreatment: Before tinning, the stranded copper wire is cleaned to remove the oil, oxide layer and impurities on the surface to ensure good bonding between the tinned layer and the copper wire matrix. The pretreatment step can effectively remove the oil, oxide layer and impurities on the surface of the copper wire, provide a good matrix surface for the subsequent electroplating tinning process, improve the bonding strength between the tinned layer and the copper wire matrix, and make the tinned layer more solid and not easy to fall off; f2) Electroplating tin: The cleaned copper strands are immersed in a plating solution containing tin ions, with the cathode as the cathode and the anode in the plating solution forming an electrolytic circuit, so that the tin ions are deposited on the surface of the copper strands to form a uniform and dense tin-plated layer; f3) Post-plating treatment: After the electroplating is completed, the copper strands are taken out of the electroplating solution, cleaned to remove the residual electroplating solution, and then dried to prevent the tinned layer from being damp or oxidized; f4) Quality inspection: Perform an appearance inspection on the tinned copper strands to ensure that the tinned layer is smooth, free of bubbles and cracks. At the same time, measure the thickness of the tinned layer to ensure that it meets the design requirements, and test the bonding strength of the tinned layer to ensure that the tinned layer is firmly bonded to the copper strand substrate and is not easy to fall off.
[0041] Example 2 See also Figure 10-11 , different from Example 1, the flexible sleeve 2 in this embodiment is a multi-layer structure, including at least two layers that are bonded to each other. The flexible sleeve 2 with a multi-layer structure can achieve a variety of functional characteristics, such as enhanced bonding strength, improved wear resistance, corrosion resistance or strength, etc., by selecting and combining materials of different layers. This design provides higher design flexibility and adaptability, so that the tinned copper stranded wire can better meet the needs of different usage scenarios. At the same time, the flexible sleeve 2 with a multi-layer structure also shows better stability and durability during processing and use.
[0042] Preferably, the flexible sleeve 2 is a multi-layer structure formed by winding copper sheets, and each layer of copper sheets is fixedly connected by close fitting or welding, and the surface of at least one layer of copper sheets is provided with a texture or coating that increases friction. This design significantly enhances the structural strength and stability of the flexible sleeve 2. The multi-layer copper sheets are fixedly connected by close fitting or welding, ensuring the firm combination between the layers, so that the flexible sleeve 2 is not easy to deform or break when subjected to external forces, thereby improving the overall durability of the tinned copper stranded wire. Moreover, the multi-layer structure of the flexible sleeve 2 also enables it to provide a larger contact area and a stronger bonding force when fixedly connected. When the unfolded ends of adjacent flexible sleeves 2 are fixedly connected to each other, the close fit between the multi-layer copper sheets ensures the firmness of the fixed connection, effectively preventing the copper wire 1 from loosening when subjected to external forces in a loose direction. In addition, the multi-layer structure flexible sleeve 2 formed by winding copper sheets has high adaptability and flexibility. By adjusting the thickness, number of layers and surface texture or coating of the copper sheet, the needs of different usage scenarios can be easily met. For example, when higher wear resistance is required, a copper sheet with a wear-resistant coating on the surface can be selected; when stronger bonding strength is required, the number of layers of the flexible sleeve 2 can be increased or a thicker copper sheet can be selected.
[0043] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.
Claims
1. A tinned copper stranded wire, comprising a plurality of copper wires (1) twisted into strands, characterized in that: Each of the copper wires (1) located at the periphery is sheathed with a flexible sheath (2); The flexible sleeve (2) is provided with a cuttable portion at one end away from the center of the tinned copper stranded wire, and after cutting, the flexible sleeve (2) can be unfolded to both sides, and the adjacent unfolded flexible sleeves (2) are fixedly connected to each other at their unfolded ends, and the fixed connection parts are mutually fitted and overlapped and are located in the gap between the adjacent copper wires (1); The overlapping parts are folded and fixed obliquely to the outer surface of the outer copper wire (1), and the oblique direction is consistent with the twisting direction of the copper wire (1).
2. The tinned copper stranded wire according to claim 1, characterized in that: The flexible sleeve (2) is a multi-layer structure, comprising at least two layers bonded to each other.
3. The tinned copper stranded wire according to claim 2, characterized in that: The flexible sleeve (2) is a multi-layer structure formed by winding copper sheets, each layer of the copper sheets is fixedly connected by tightly fitting or welding, and the surface of at least one layer of the copper sheets is provided with a texture or coating that increases friction.
4. The tinned copper stranded wire according to claim 1, characterized in that: The cut portion of the flexible sleeve (2) is provided with a tear line or a weakened area.
5. A production process for tinned copper stranded wire, the production process is used to make the tinned copper stranded wire according to any one of claims 1 to 4, characterized in that: The following steps are involved: a) Preparation of copper wires (1): Select copper wires (1) of a predetermined quantity and specification, and ensure that the surface of the copper wires (1) is smooth and free of damage; b) Flexible sleeve (2) installation: Flexible sleeves (2) are installed on each of the copper wires (1) located at the periphery one by one; c) Twisting process: twisting the copper wire (1) sheathed with the flexible sheath (2) according to a predetermined twisting method; d) Cutting and unfolding the flexible sleeve (2): After the twisting is completed, the end of each flexible sleeve (2) away from the center of the copper stranded wire is cut, so that the flexible sleeve (2) can be unfolded to both sides; e) Fixing and fitting the flexible sleeve (2): The ends of the adjacent unfolded flexible sleeves (2) are fixedly connected to each other, the fixed connection parts are fitted and overlapped and are located in the gaps between the adjacent copper wires (1), and then the overlapping parts are folded and fixed obliquely to the outer surface of the outer copper wire (1), and the inclination direction is consistent with the twisting direction of the copper wire (1); f) Tinning treatment: Tinning treatment is performed on the stranded copper wires; g) Inspection and packaging: The finished tinned copper stranded wire is subjected to quality inspection. After passing the inspection, the tinned copper stranded wire is packaged.
6. The production process of tinned copper stranded wire according to claim 5, characterized in that: After step e and before step f, the method further comprises the following steps: e1) Shaping and shaping: Shaping treatment: using a shaping mold to shape the flexible sleeve (2) that is folded and tilted and fixed on the outer surface of the outer copper wire (1), placing the stranded wire into the shaping mold, and applying and maintaining pressure; Shaping treatment: After the shaping treatment, the stranded wire is moved to a shaping device, a restraining force is applied to the stranded wire to maintain the shape and position of the flexible sleeve (2) after shaping, and the stranded wire is placed in the shaping device until the flexible sleeve (2) is fully shaped.
7. The production process of tinned copper stranded wire according to claim 5, characterized in that: The tinning treatment in step f specifically includes the following sub-steps: f1) Pretreatment: Before tinning, the stranded copper wire is cleaned to remove surface oil, oxide layer and impurities; f2) Electroplating tin: The cleaned copper strands are immersed in a plating solution containing tin ions, with the cathode as the cathode and the anode in the plating solution forming an electrolytic circuit, so that the tin ions are deposited on the surface of the copper strands to form a uniform and dense tin-plated layer; f3) Post-plating treatment: After the electroplating is completed, the copper strands are taken out of the electroplating solution for cleaning and drying; f4) Quality inspection: Perform visual inspection on the tinned copper strands, measure the thickness of the tinning layer, and test the bonding strength of the tinning layer.