Spring coil unit and connection structure thereof, composite coil spring contact finger and manufacturing method thereof, plug

Abstract

The application discloses a spring coil unit and a connecting structure thereof, a composite spiral spring contact finger and a manufacturing method thereof, and a plug-in connector, and relates to the technical field of electrical connection. The spring coil unit comprises a connecting rod and an arc-shaped connecting sheet. The connecting rod comprises a fixed end and a connecting end. The arc-shaped connecting sheet comprises a first end and a second end. The fixed end is connected with the first end. The connecting end and the second end are staggered and arranged away from each other. The spring coil unit has the advantages of simple structure, small size, multiple contact points, strong conductivity, good wear resistance and the like. The contact stress of the spring coil unit is less affected by the deformation factor. A larger deviation of a joint surface is allowed. The problem that the current is unevenly distributed due to the fact that the contact resistance of each part of a conventional watchband contact finger is too large under an eccentric state is avoided. The overheat aging of an elastic electrical contact component under a large current flow condition is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of electrical connection technology, specifically to spring coil units and their connection structures, composite helical spring contact fingers and their manufacturing methods, and plug-in components. Background Technology

[0002] The description of the background art in this invention pertains to related technologies and is used merely for illustration and to facilitate understanding of the invention. It should not be construed as the applicant explicitly believing or presuming that the invention was prior art on the filing date of the first application.

[0003] A contact finger structure is a special elastic electrical connection component between a plug and a socket. Through deformation, elastic stress is generated, creating multiple contact points between the contact finger and the conductor. These contact points act as a bridge, achieving electrical interconnection between the plug and the socket. Due to their simple structure, small size, and suitability for mass production, contact finger electrical connection components are widely used in various electrical equipment, such as switchgear, circuit breakers, transformers, switch cabinets, and gas-insulated busbars.

[0004] Excessive Joule heat generated by the contact resistance at the contact points of the contact fingers can easily degrade the contact finger material, causing poor contact and seriously threatening the operational reliability of electrical connections such as plugs and sockets. Currently, commonly used contact finger structures include star-shaped contact fingers, watchband contact fingers, and spring contact fingers. While watchband contact fingers have strong current-carrying capacity, they require high processing precision and material heat treatment processes. Furthermore, the elastic stress of watchband contact fingers varies greatly, demanding high precision in contact dimensions, lacking radial constraint, and being significantly affected by the eccentricity of the plug and socket, making it difficult to guarantee stable and uniform contact resistance. Spring contact fingers, on the other hand, have a simple structure and constant contact stress, allowing for larger tolerances and errors in contact surface design. However, due to the limitations of their elastic structure, their current-carrying capacity is slightly lower than that of watchband contact fingers. In terms of manufacturing processes, they also lag far behind advanced foreign technologies, resulting in electrical connection components with poor current-carrying capacity, low tensile strength and fatigue strength, and fluctuating quality. Under high current conditions, excessive temperature rise can easily occur, causing the electrical connection components to burn out. Summary of the Invention

[0005] The purpose of this invention is to provide a spring coil unit and its connection structure, a composite helical spring contact finger and its manufacturing method, and a connector, so as to solve the problem that the Joule heat generated by the contact resistance of the existing contact finger contact point is too large, which leads to the burnout of electrical connection components.

[0006] The technical solution of the present invention to solve the above-mentioned technical problems is as follows:

[0007] A spring coil unit includes a connecting rod and an arc-shaped connecting piece. The connecting rod includes a fixed end and a connecting end. The arc-shaped connecting piece includes a first end and a second end. The fixed end is connected to the first end, and the connecting end and the second end are staggered and away from each other.

[0008] Furthermore, the cross-section of the arc-shaped connecting piece is semi-elliptical.

[0009] The beneficial effects of adopting the above technical solution are as follows: the semi-elliptical arc-shaped connecting piece can provide a certain deformation stress, and the bottom straight axis of the spring coil unit corresponds to the mounting contact surface. Compared with the traditional circular helical spring contact finger, the semi-elliptical design improves the installation structure stability of the helical spring, enhances its good contact with the mounting base, and avoids the axial self-rotation that may occur when the traditional spring contact finger is inserted or removed. In addition, it has more stable elastic stress within the installation range or a certain compression deformation range, and also has a larger compression range, which allows for larger deviations in the assembly of the contact surface.

[0010] Furthermore, the spring coil unit is provided with conductive contact pieces, and each end of the conductive contact piece is provided with a bent clamping angle, so that the two ends of the conductive contact piece are respectively engaged with the fixed end and the connecting end; an extension piece is provided on the outside of the conductive contact piece to extend and cover the arc-shaped connecting piece.

[0011] The beneficial effects of adopting the above technical solution are as follows: Considering the shape of the spring coil unit, clamping angles are respectively set at both ends of the conductive contact finger piece. The clamping angles are adapted to the structure of the arc-shaped connecting piece, thereby mounting the conductive contact finger piece on the arc-shaped connecting piece. In addition, the conductive contact finger piece is provided with an extension piece, which extends and covers the top of the spring coil unit, increases the contact with the contact surface, and forms a reliable electrical connection. At the same time, the position of the extension angle is not fixed, avoiding excessive constraint on the spring coil unit and affecting the elastic performance of the contact finger.

[0012] A spring coil unit connection structure includes a first spring coil unit and a second spring coil unit, both of which are the aforementioned spring coil units. The connecting rods of the first and second spring coil units are arranged parallel to each other. The fixed end of the first spring coil unit is connected to the first end of the first spring coil unit, and the second end of the first spring coil unit is connected to the connecting end of the second spring coil unit. The fixed end of the second spring coil unit is connected to the first end of the second spring coil unit, and the arc-shaped connecting pieces of the first and second spring coil units are close to each other.

[0013] A composite helical spring contact finger includes multiple spring coil units, which are sequentially connected to form a loop, and adjacent spring coil units are connected by the aforementioned spring coil unit connection structure.

[0014] The beneficial effects of adopting the above technical solution are as follows: multiple spring coil units are connected to form a ring, and each spring coil unit is provided with a conductive contact finger. The deformation elastic stress of the spring coil unit is accurately transmitted to the conductive contact finger, ensuring good contact between the conductive contact finger and the contact. The spring coil unit provides stable and reliable contact stress. As the current-carrying component of this technical solution, the conductive contact finger independently realizes its current-conducting function and elastic deformation stress function, so that the composite helical spring contact finger has both the stable elastic stress required for electrical connection components and sufficient current-carrying capacity. This technical solution combines the advantages of conventional spring contacts and composite structure contacts, featuring simple structure, small size, multiple contact points, strong conductivity, and good wear resistance. Moreover, its contact stress is less affected by deformation factors, allowing for larger deviations in the mating surface. This avoids the problem of uneven current conduction caused by excessive differences in contact resistance at various points in conventional watch band contacts under eccentric conditions. It greatly reduces the overheating and aging of elastic electrical contact components under high current conditions, thus improving service life. In other words, it solves the problem of excessive Joule heat generated by the contact resistance of existing contacts, which leads to the burnout of electrical connection components.

[0015] A method for manufacturing a composite helical spring contact finger, comprising the following steps:

[0016] S1: Manufacturing spring coil strips: Prepare raw material wire for spring coil units, and wind the raw material wire into multiple spring coil units connected in sequence to obtain spring coil strips;

[0017] S2: Loop Forming: Weld the ends of the spring coil strip into a loop, and then perform shaping and heat treatment on the loop;

[0018] S3: Manufacturing conductive contact sheets: Select the material for preparing conductive contact sheets, punch the material into conductive contact sheets, and then perform heat treatment and silver plating on the formed conductive contact sheets in sequence to obtain conductive contact sheets;

[0019] S4: Assemble the spring coil unit and conductive contact finger.

[0020] The beneficial effects of adopting the above technical solution are as follows: Considering the different structures of the spring coil unit and the conductive contact finger, the spring coil unit and the conductive contact finger are designed with different production processes in terms of materials and functions, and then assembled. This further strengthens the stable elastic stress and current carrying capacity required for the electrical connection components. At the same time, based on the development and advantages of cold extrusion molding technology, it is applied to the production of composite helical spring contact fingers. Compared with the traditional contact finger manufacturing process, it increases the current carrying capacity and service life of the contact fingers, improves the material utilization rate and production efficiency in the production process, and reduces production costs.

[0021] Further, in step S2, the shaping process is as follows: after pressing multiple spring coil units into an inclined state, the single-turn spacing of a single spring coil unit is adjusted.

[0022] Furthermore, in step S3, the heat treatment includes a solution treatment process and an aging treatment process. The solution treatment involves heating in an ammonia furnace to 780°C for 9 hours, followed by water quenching. The aging treatment involves heating at 280°C for 3 hours.

[0023] The beneficial effects of adopting the above technical solution are as follows: The heat treatment process parameters used in this technical solution have the best effect on hardness due to the softening effect of recovery and recrystallization in the material, resulting in a suitable grain size, a slight reduction in hardness value and greater uniformity, with the hardness value mainly concentrated in the range of 80-95 HBW. This improves the adhesion of the silver plating layer, while ensuring its high-temperature creep resistance, preventing rigid deformation and cracks during product service, which would affect the product's pressing strength and electrical contact effect. Furthermore, it fully utilizes its high elasticity, increases elastic strain pressure, and reduces contact resistance.

[0024] Furthermore, in step S3, the conductive contact sheet is pretreated before silver plating, including the following steps: alkaline degreasing, hydrochloric acid derusting, mixed acid brightening, and dilute hydrochloric acid activation.

[0025] A connector includes a connector plug, a connector sleeve, and the aforementioned composite helical spring contact finger, with a ring installed in a groove in the connector plug and the connector sleeve fitted onto the connector plug.

[0026] The present invention has the following beneficial effects:

[0027] (1) The arc-shaped connecting piece of the present invention is semi-elliptical and can provide a certain deformation stress. The bottom straight axis of the spring coil unit corresponds to the mounting contact surface. Compared with the traditional circular helical spring contact finger, the semi-elliptical design improves the installation structure stability of the helical spring, enhances its good contact with the mounting base, and avoids the axial self-rotation that may occur when the traditional spring contact finger is inserted or removed. In addition, it has more stable elastic stress within the installation range or a certain compression deformation range, and also has a larger compression range, which allows for larger deviations in the assembly of the contact surface.

[0028] (2) The spring contact finger of the present invention combines the advantages of conventional spring contact fingers and composite structure contact fingers. It has the advantages of simple structure, small size, multiple contact points, strong conductivity, and good wear resistance. Moreover, its contact stress is less affected by deformation factors, and it allows for large deviations in the joint surface. It avoids the problem of uneven current conduction caused by the large difference in contact resistance at various points in the current conventional watch band contact fingers under eccentric state. It greatly reduces the overheating and aging of elastic electrical contact components under high current conditions, and improves service life. In other words, it solves the problem of excessive Joule heat generated by the contact resistance of existing contact finger contact points, which leads to the burnout of electrical connection components.

[0029] (3) This invention takes into account the different structures of the spring coil unit and the conductive contact piece. The spring coil unit and the conductive contact piece are designed with different production processes in terms of materials and functions, and then assembled. This further strengthens the stable elastic stress and current carrying capacity required for the electrical connection components. At the same time, based on the development and advantages of cold extrusion molding process, it is applied to the production of composite helical spring contact fingers. Compared with the traditional contact finger manufacturing process, it increases the current carrying capacity and service life of the contact fingers, improves the material utilization rate and production efficiency in the production process, and reduces the production cost. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the spring coil connection structure of the present invention.

[0031] Figure 2 This is a schematic diagram of the composite helical spring contact finger of the present invention.

[0032] Figure 3 This is a schematic diagram of the ring structure of the present invention;

[0033] Figure 4 This is a schematic diagram of the installation structure of the composite helical spring contact finger of the present invention.

[0034] In the diagram: 1-Connecting rod; 101-Fixed end; 102-Connecting end; 2-Conductive contact finger; 3-Clamping angle; 4-Extension piece; 5-Ring; 6-Connecting plug; 7-Connecting sleeve; 8-Arc-shaped connecting piece; 801-First end; 802-Second end. Detailed Implementation

[0035] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0036] Example 1

[0037] Please refer to Figure 1A spring coil unit includes a connecting rod 1 and an arc-shaped connecting piece 8. The connecting rod 1 includes a fixed end 101 and a connecting end 102. The arc-shaped connecting piece 8 includes a first end 801 and a second end 802. The fixed end 101 is connected to the first end 801. The connecting end 102 and the second end 802 are staggered and far apart from each other, so that the spring coil unit is in an open state. The cross-section of the arc-shaped connecting piece 8 is semi-elliptical. The spring coil unit is made of elastic stainless steel.

[0038] Common spring coil units have a circular cross-section, while the spring coil unit in this embodiment includes a connecting rod 1 and an arc-shaped connecting piece 8. The arc-shaped connecting piece 8 is semi-elliptical and can provide a certain deformation stress. The bottom straight axis of the spring coil unit corresponds to and fits against the surface of the mounting contact. Compared with the traditional circular helical spring contact finger, the semi-elliptical design improves the stability of the helical spring installation structure, enhances its good contact with the mounting base, and avoids the axial self-rotation that may occur when the traditional spring contact finger is inserted or removed. In addition, it has more stable elastic stress within the installation range or a certain compression deformation range, and also has a larger compression range, which allows for larger deviations in the assembly of the contact surface.

[0039] The spring coil unit is equipped with conductive contact pieces 2, which are made of C17200 beryllium copper. Each end of the conductive contact piece 2 has a bent clamping angle 3. The two ends of the conductive contact piece 2 are respectively engaged with the fixed end 101 and the connecting end 102. An extension piece 4 is provided on the outer side of the conductive contact piece 2 to extend and cover the arc-shaped connecting piece 8. Considering the shape of the spring coil unit, clamping angles 3 are provided at both ends of the conductive contact piece 2. The clamping angles 3 are adapted to the structure of the arc-shaped connecting piece 8, thereby mounting the conductive contact piece 2 onto the arc-shaped connecting piece 8. Furthermore, the conductive contact piece 2 is provided with the extension piece 4, which extends and covers the top of the spring coil unit, increasing the contact with the contact surface and forming a reliable electrical connection. At the same time, the position of the extension angle is not fixed to avoid excessive constraint on the spring coil unit, which could affect the elastic performance of the contact.

[0040] Example 2

[0041] Please refer to Figure 2A spring coil unit connection structure is disclosed, comprising a first spring coil unit and a second spring coil unit, both of which are spring coil units as described in Embodiment 1. Since the spring coil unit in this embodiment includes a connecting rod 1 and an arc-shaped connecting piece 8, the connection methods between adjacent spring coil units differ, in addition to considering the connection between the connecting rod 1 and the arc-shaped connecting piece 8. The connecting rod 1 of the first spring coil unit and the connecting rod 1 of the second spring coil unit are arranged parallel to each other. The fixed end 101 of the first spring coil unit is connected to the first end 801 of the first spring coil unit, the second end 802 of the first spring coil unit is connected to the connecting end 102 of the second spring coil unit, and the fixed end 101 of the second spring coil unit is connected to the first end 801 of the second spring coil unit. The arc-shaped connecting pieces 8 of the first and second spring coil units are close to each other.

[0042] Example 3

[0043] Please refer to Figure 3 A composite helical spring contact finger is disclosed, comprising multiple spring coil units connected sequentially to form a loop 5. Adjacent spring coil units are connected via the spring coil unit connection structure described in Embodiment 2. The multiple spring coil units are connected end-to-end to form a loop 5. Each spring coil unit is provided with a conductive contact piece 2. The deformation elastic stress of the spring coil unit is precisely transmitted to the conductive contact piece 2, ensuring good contact between the conductive contact piece 2 and the contact. The spring coil unit provides stable and reliable contact stress. The conductive contact piece 2, as the current-carrying component of this invention, independently realizes its current-conducting function and elastic deformation stress function, enabling the composite helical spring contact finger to possess both the stable elastic stress required for an electrical connection component and sufficient current-carrying capacity. The spring contact finger of this invention combines the advantages of conventional spring contact fingers and composite structure contact fingers. It has the advantages of simple structure, small size, multiple contact points, strong conductivity, and good wear resistance. Moreover, its contact stress is less affected by deformation factors, allowing for larger deviations in the mating surface. This avoids the problem of uneven current conduction caused by excessive differences in contact resistance at various points in conventional watch band contact fingers under eccentric conditions. It greatly reduces the overheating and aging of elastic electrical contact components under high current conditions, and improves service life. In other words, it solves the problem of excessive Joule heat generated by the contact resistance of existing contact fingers, which leads to the burnout of electrical connection components.

[0044] In this embodiment, the two ends of the conductive contact finger 2 are respectively engaged with the connection points of the corresponding fixed end 101 and the first end 801, and the connection point of the connecting end 102 and the second end 802.

[0045] Example 4

[0046] Please refer to Figure 4A connector includes a connector plug 6, a connector sleeve 7, and a composite helical spring contact finger as described in Embodiment 3. A ring 5 is installed in a groove of the connector plug 6, and the connector sleeve 7 is fitted onto the connector plug 6. The composite helical spring contact finger is securely installed in the groove of the connector plug 6 by the tightening force of its own helical spring, and then the connector sleeve 7 is fitted onto the connector plug 6, forming a reliable electrical connection. To ensure sufficient current carrying capacity, multiple contact fingers can be installed at the connection point; however, the installation diagram in this embodiment is for illustrative purposes only and does not impose a specific quantity limit.

[0047] Example 5

[0048] A method for manufacturing a composite helical spring contact finger, the process comprising the following steps:

[0049] S1: Manufacturing spring coil strips: The process of preparing the raw material wire for spring coil units includes batching, smelting, ingot casting, annealing, forging, rolling, pickling, and cold drawing steps; the raw material wire is placed on a CNC spring winding machine and wound into multiple spring coil units connected in sequence to obtain spring coil strips;

[0050] Multiple annealing processes, as well as hot deformation methods such as casting, forging, and rolling, can produce pre-brushes, which can uniformly refine the internal structure of the material, preparing it for the next step of cold drawing into wire. At the same time, it can give stainless steel wire higher compressive and tensile strength, elastic limit, and higher fatigue strength.

[0051] S2: Ring 5 Formation: The spring coil strips are connected end to end and welded to form ring 5. Manual argon arc welding is used. The appropriate amount of argon gas, current and arc start time are selected. After welding the ends of the spring coil strips, the ring 5 is formed. To ensure the quality of the welded joint, the tooling fixture that matches the shape of the spring coil strip is used during welding. After the ring 5 is formed, multiple spring coil units are pressed into an inclined state. The single-turn spacing of the individual spring coil units is adjusted to make it more uniform. Then the ring 5 is heat treated.

[0052] Using tooling fixtures can improve welding strength, ensure full welds, and prevent incomplete or false welds.

[0053] S3: Manufacturing the conductive contact piece 2: Select the material for preparing the conductive contact piece 2, place the material in a multi-stage composite progressive die, and use a cold extrusion forming process to punch and form the conductive contact piece 2. Before silver plating, the conductive contact piece 2 undergoes pretreatment: alkaline degreasing, hydrochloric acid derusting, mixed acid brightening, and dilute hydrochloric acid activation. The formed conductive contact piece 2 is then subjected to heat treatment, including solution treatment and aging treatment. Solution treatment: heating in an ammonia furnace to 780℃ for 9 hours, followed by water quenching; Aging treatment: 280℃ for 3 hours. Silver plating is then performed. Silver plating is done by electroplating the surface to form an arc-shaped conductive contact piece 2, with a plating thickness of 18-24μm. The surface silver plating process prevents corrosion and deterioration of the beryllium copper and reduces contact resistance.

[0054] The conductive contact pad 2 is made of C17200 beryllium copper, with the following chemical composition: Be 1.90-2.15%, Ni 0.20-0.25%, Co 0.35-0.65%, and the remainder being Cu. This material has high mechanical strength, high wear resistance, and high thermal and electrical conductivity.

[0055] Considering that the conductive contact piece 2 is provided with a bent clamping angle 3, after the conductive contact piece 2 is formed, the clamping angle 3 is first punched and bent, and then the conductive contact piece 2 is punched and bent to form an extension piece 4 with a certain covering angle. The size requirements should be strictly controlled here to avoid the contact piece and the coil spring not being able to be combined or not being matched accurately during the assembly process. The thickness of the contact piece is 0.5mm and the width of the contact piece is 20mm.

[0056] The heat treatment process parameters used in this invention optimize the softening effect of material recovery and recrystallization on hardness, achieving a suitable grain size that slightly reduces and makes the hardness more uniform, with the hardness value mainly concentrated in the range of 80-95 HBW. This results in better adhesion of the silver plating layer while ensuring its high-temperature creep resistance, preventing rigid deformation and cracks during product service that could affect the product's pressing strength and electrical contact effect. Furthermore, it fully utilizes the product's high elasticity, increasing elastic strain pressure and reducing contact resistance.

[0057] S4: Assemble the spring coil unit and the conductive contact piece 2. The conductive contact piece 2 covers the spring coil unit. The two ends of the conductive contact piece 2 are strongly pressed to the two ends of the arc-shaped connecting piece 8 of the corresponding spring coil unit to complete the assembly of the spring coil unit and the conductive contact piece 2. Repeat the steps to assemble all the arc-shaped conductive contact pieces 2 on multiple spring coil units.

[0058] After the composite helical spring contact finger is formed, it is installed into a standard plug socket for insertion / extraction force and contact resistance testing. Considering the different structures of the spring coil unit and the conductive contact finger 2, different production processes were designed for their materials and functions before assembly. This further enhances the stable elastic stress and current-carrying capacity required for the electrical connection components. Furthermore, based on the development and advantages of domestic cold extrusion molding technology, it is applied to the manufacturing of the composite helical spring contact finger. Compared to traditional contact finger manufacturing processes, this increases the contact finger's current-carrying capacity and service life, improves material utilization and production efficiency, and reduces production costs.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A composite helical spring contact finger including a spring coil unit, characterized in that, The spring coil unit includes: a connecting rod (1) and an arc-shaped connecting piece (8). The connecting rod (1) includes a fixed end (101) and a connecting end (102). The arc-shaped connecting piece (8) includes a first end (801) and a second end (802). The fixed end (101) is connected to the first end (801). The connecting end (102) and the second end (802) are staggered and far apart from each other. The cross-section of the arc-shaped connecting piece (8) is semi-elliptical; The spring coil unit is provided with a conductive contact piece (2), and the two ends of the conductive contact piece (2) are respectively provided with bent clamping angles (3), so that the two ends of the conductive contact piece (2) are respectively engaged with the fixed end (101) and the connecting end (102); the outer side of the conductive contact piece (2) is provided with an extension piece (4) that extends and covers the arc-shaped connecting piece (8). The spring coil unit connection structure includes: a first spring coil unit and a second spring coil unit. Both the first spring coil unit and the second spring coil unit adopt the spring coil unit. The connecting rod (1) of the first spring coil unit is arranged parallel to the connecting rod (1) of the second spring coil unit. The fixed end (101) of the first spring coil unit is connected to the first end (801) of the first spring coil unit. The second end (802) of the first spring coil unit is connected to the connecting end (102) of the second spring coil unit. The fixed end (101) of the second spring coil unit is connected to the first end (801) of the second spring coil unit. The arc-shaped connecting pieces (8) of the first spring coil unit and the second spring coil unit are close to each other. The composite helical spring contact finger includes multiple spring coil units, which are sequentially connected to form a loop (5), and adjacent spring coil units adopt the spring coil unit connection structure; The arc-shaped connecting piece (8) is semi-elliptical and can provide a certain deformation stress. The bottom straight axis of the spring coil unit corresponds to the mounting contact surface. The semi-elliptical design improves the stability of the helical spring installation structure, enhances its contact with the mounting base, and avoids axial self-rotation that may occur during insertion and removal. In addition, it has more stable elastic stress within the installation range or compression deformation range, and also has a larger compression range, which allows for larger deviations in the assembly of the contact surface.

2. A method for manufacturing a composite helical spring contact finger, used to manufacture the composite helical spring contact finger of claim 1, characterized in that, Includes the following steps: S1: Manufacturing spring coil strip: Prepare the raw material wire of the spring coil unit, and wind the raw material wire into a plurality of spring coil units connected in sequence to obtain a spring coil strip; S2: Ring (5) forming: The spring coil strips are connected end to end and welded to form a ring (5). The ring (5) is then shaped and heat-treated. S3: Manufacturing the conductive finger sheet (2): Select the material for preparing the conductive finger sheet (2), punch the material into the conductive finger sheet (2), and perform heat treatment and silver plating on the formed conductive finger sheet (2) in sequence to obtain the conductive finger sheet (2). S4: Assemble the spring coil unit and the conductive contact finger (2).

3. The method for manufacturing the composite helical spring contact finger according to claim 2, characterized in that, In step S2, the shaping process is as follows: after pressing the multiple spring coil units into an inclined state, the single-turn spacing of a single spring coil unit is adjusted.

4. The method for manufacturing the composite helical spring contact finger according to claim 2, characterized in that, In step S3, the heat treatment includes a solution treatment process and an aging treatment process. Solution treatment: heating in an ammonia furnace to 780°C for 9 hours, followed by water quenching; Aging treatment: 280°C for 3 hours.

5. The method for manufacturing the composite helical spring contact finger according to claim 2, characterized in that, In step S3, the conductive contact sheet (2) is pretreated before silver plating, including the following steps: alkaline degreasing, hydrochloric acid derusting, mixed acid brightening, and dilute hydrochloric acid activation.

6. A connector, characterized in that, include: The connector (6), connector sleeve (7) and composite helical spring contact finger as described in claim 1 are provided, wherein the ring (5) is installed in the groove of the connector (6) and the connector sleeve (7) is fitted onto the connector (6).

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