A spring terminal structure and a connector assembly thereof
Patent Information
- Application Number
- CN202522121606.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-30
- Publication Date
- 2026-08-21
- Estimated Expiration
- 2035-09-30
AI Technical Summary
[0003]因此，本实用新型要解决的技术问题在于克服现有技术中的插簧端子结构多为双泡点接触形式，接触面积有限，易引起局部温升，影响连接可靠性的问题
[0017]1. The spring-loaded terminal structure provided by this utility model consists of a square contact structure formed by a pair of elastic arms. The square contact structure has a clamping cavity for holding and accommodating the pin, so that it forms at least four points of contact with the outer peripheral wall of the pin. Compared with the traditional double-bubble contact form, this design significantly increases the contact area, reduces the current density per unit area, avoids contact performance degradation caused by high temperature, and greatly improves the reliability and stability of circuit conduction. The spring-loaded terminal structure using this technical solution forms a multi-dimensional limit on the pin through the square contact structure and the clamping cavity clamping design. That is, the square contact structure applies constraint force to the pin from four directions at the same time, and the clamping force of the elastic arms can accurately fix the position of the pin, effectively preventing the pin from shifting or shaking during insertion and removal or use. The insertion and removal force and contact stress of the pin can be evenly distributed to the four contact points and two elastic arms through the square inner wall, avoiding stress concentration, effectively resisting vibration and impact, and ensuring that the spring-loaded terminal can maintain excellent rebound force and contact positive pressure even after multiple insertions and removals, significantly improving the service life and long-term stability of the spring-loaded terminal.
Smart Images
Figure CN224669153U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of connector technology, specifically to a spring-loaded terminal structure and its connector assembly. Background Technology
[0002] In the field of electronic and electrical connection technology, spring terminals, as a fundamental and critical connecting element, are widely used in various connectors to achieve reliable conduction between circuits. Traditional spring terminals are usually used in conjunction with pin terminals, and the two are connected by insertion and extraction along the axial direction. The insertion and extraction force of the spring terminal is a key performance indicator. Traditional spring terminal structures are mostly of the "double bubble point" contact type, that is, the inner side of the spring is designed with two raised contact points, and conduction is achieved through point contact with the surface of the pin. This spring structure can meet basic connection requirements to a certain extent, but its limited contact area leads to a high current density per unit area, which can easily cause local temperature rise and affect connection reliability. In addition, the double point contact has a weak positioning ability for the pin, and problems such as spring arm loosening and decreased rebound force often occur after repeated insertion and extraction. On the other hand, with the increase in equipment integration and optimization of space layout, a new type of spring connection method has emerged—a structure in which the insertion direction is perpendicular to the spring axis. This structure places higher demands on the insertion hole position, guiding structure, and force distribution of the spring. Utility Model Content
[0003] Therefore, the technical problem to be solved by this utility model is to overcome the problem that the existing spring terminal structure is mostly a double bubble point contact form, which has a limited contact area and is prone to local temperature rise, affecting the reliability of the connection.
[0004] To solve the above-mentioned technical problems, this utility model provides a spring-loaded terminal structure for connecting with a pin, comprising:
[0005] Insert spring body;
[0006] At least one pair of elastic arms extend from the spring body and together enclose a square contact structure that engages with the pin. The square contact structure has a clamping cavity for holding and accommodating the pin. The opening direction of the clamping cavity is perpendicular to the axial direction of the spring body. The square contact structure forms at least four-point contact with the outer peripheral wall of the pin inserted into its clamping cavity.
[0007] In the above-mentioned spring terminal structure, the square contact structure includes two V-shaped contact portions formed by bending a pair of elastic arms relative to each other, and a clamping cavity formed between the two V-shaped contact portions, with the two V-shaped contact portions being symmetrically distributed.
[0008] In the above-described spring terminal structure, the clamping cavity is tapered along the insertion direction of the insert pin, and the size of the inlet end of the clamping cavity is larger than its inner cavity size.
[0009] In the above-mentioned spring terminal structure, the inner wall of the clamping cavity is formed by the inner sidewalls of two V-shaped contact portions, by setting the inner sidewall of at least one V-shaped contact portion at an angle of 0.5° to 1.5° with the insertion direction of the pin.
[0010] In the above-mentioned spring terminal structure, the clamping cavity has four inner contact walls that form four-point contact with the inserted pin, and each of the four inner contact walls is provided with the tilt angle, which is 0.6°.
[0011] In the above-mentioned spring terminal structure, two V-shaped contact portions together form a clamping cavity with a square or rhomboid cross-section, and the inner sidewalls of the two V-shaped contact portions are inclined plane structures that extend according to the aforementioned tilt angle.
[0012] In the above-mentioned spring terminal structure, the pair of elastic arms and their V-shaped contact parts are integrally stamped with the spring body, and the end of the spring body away from the elastic arms is provided with a wiring part.
[0013] In the above-described spring terminal structure, the ends of a pair of elastic arms away from the spring body are connected to form a U-shaped insertion end.
[0014] This utility model also provides a connector assembly, including a female connector, a male connector, and a spring terminal structure as described above. The spring terminal structure is fixedly housed within the female connector and includes a square contact structure formed by a pair of elastic arms. The female connector has a socket hole that communicates with the clamping cavity formed by the square contact structure. The male connector has a pin that passes through the socket hole and is inserted into the square clamping cavity.
[0015] In the connector assembly described above, the female connector has multiple terminal receiving cavities for installing the spring-loaded terminal structure. Each terminal receiving cavity has a wiring port and a plug-in interface extending from both ends of the female connector. The U-shaped plug end of the spring-loaded terminal structure is located at the plug-in interface. The plug hole is located at the top or bottom of the female connector, and the axis of the plug hole is perpendicular to the central axis of the terminal receiving cavity.
[0016] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art:
[0017] 1. The spring-loaded terminal structure provided by this utility model consists of a square contact structure formed by a pair of elastic arms. The square contact structure has a clamping cavity for holding and accommodating the pin, so that it forms at least four points of contact with the outer peripheral wall of the pin. Compared with the traditional double-bubble contact form, this design significantly increases the contact area, reduces the current density per unit area, avoids contact performance degradation caused by high temperature, and greatly improves the reliability and stability of circuit conduction. The spring-loaded terminal structure using this technical solution forms a multi-dimensional limit on the pin through the square contact structure and the clamping cavity clamping design. That is, the square contact structure applies constraint force to the pin from four directions at the same time, and the clamping force of the elastic arms can accurately fix the position of the pin, effectively preventing the pin from shifting or shaking during insertion and removal or use. The insertion and removal force and contact stress of the pin can be evenly distributed to the four contact points and two elastic arms through the square inner wall, avoiding stress concentration, effectively resisting vibration and impact, and ensuring that the spring-loaded terminal can maintain excellent rebound force and contact positive pressure even after multiple insertions and removals, significantly improving the service life and long-term stability of the spring-loaded terminal.
[0018] 2. In the spring-loaded terminal structure provided by this utility model, the opening direction of the clamping cavity is perpendicular to the spring axis, which allows the connector to be laid out in the device along a direction perpendicular to the traditional axis. This directly matches the new connection scenario where the insertion direction is perpendicular to the spring axis, without the need for additional modification to the overall spring structure. This breaks through the application limitations of traditional spring axial insertion and removal, expands the application range of connectors in high-density, small-space devices, and meets the integrated layout requirements of modern electronic devices.
[0019] 3. In the spring terminal structure provided by this utility model, the square contact structure includes two symmetrical V-shaped contact portions formed by bending a pair of elastic arms relative to each other, and a tapered square clamping cavity formed between the two V-shaped contact portions. The advantage of this design is that the V-shaped contact portion can effectively transmit and disperse the radial insertion and extraction force along its arm to the root, greatly enhancing the mechanical strength and deformation resistance of the structure. The two V-shaped contact portions naturally form a four-point contact with the insert pin inserted into the clamping cavity, ensuring uniform contact pressure. The tapered design of the clamping cavity provides a funnel-shaped guide for the insert pin. The narrower cavity wall of the channel provides sufficient clamping force. When the pin is initially inserted into the clamping cavity, the wider entrance end can easily accommodate the pin, guiding it towards the center of the clamping cavity without precise alignment. As the pin penetrates deeper into the clamping cavity, it gradually adheres to the outer peripheral wall of the pin through two V-shaped contact parts. The contact pressure increases linearly, and the clamping force slowly increases, ensuring that the pin does not wobble during insertion. At this time, the elastic arm is under pressure and in an elastic pre-tightened state, so that the square contact structure maintains a continuous and constant positive force at the contact point with the pin through the pre-tightening force of the elastic arm, improving connection stability.
[0020] 4. In the spring terminal structure provided by this utility model, the inner wall of the clamping cavity is formed by the inner sidewalls of two V-shaped contact portions. The reduced shape of the clamping cavity is formed by designing its four inner contact walls with the same inclination angle, which significantly reduces the initial insertion force of the pin and ensures that the radial force on the pin in the circumferential direction is completely uniform and symmetrical during the insertion process and after connection. This ensures that the spring terminal provides a stable holding force after the pin is connected. The clamping cavity designed in this way forms a uniformly distributed four-point contact with the pin through the four inner contact walls. All the stress and wear generated by the pin insertion and removal cycle are equally distributed through the four contact points, resulting in better vibration resistance.
[0021] 5. In the connector assembly provided by this utility model, the female connector adopts a square contact structure design for the spring terminal. The two V-shaped contact parts of the square contact structure form a symmetrical four-point contact with the outer periphery of the pin, which can evenly distribute the vibration load to the entire elastic arm, significantly enhancing the vibration / impact resistance, making the connection more reliable, and improving the current carrying capacity. In addition, the clamping cavity formed by the two V-shaped contact parts is designed to taper along the insertion direction of the pin. The narrower cavity wall obtains sufficient clamping force, so that the small displacement of the pin generated during vibration is converted into additional clamping force on the V-shaped contact parts. Combined with the elastic restoring force of the elastic arm, it can effectively suppress the loosening of the pin and improve the mechanical performance and service life of the product. Attached Figure Description
[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0023] Figure 1 This is a three-dimensional structural diagram of the spring-loaded terminal structure of this utility model;
[0024] Figure 2 This is a cross-sectional schematic diagram of the spring terminal structure and the pin of this utility model;
[0025] Figure 3 This is a front view of the spring terminal structure of this utility model;
[0026] Figure 4 A schematic diagram of the female connector provided by this utility model;
[0027] Figure 5 This is a cross-sectional structural diagram of the female connector of this utility model.
[0028] Explanation of reference numerals in the attached drawings: 1. Spring body; 11. Wiring part; 12. Socket end; 2. Elastic arm; 3. Square contact structure; 31. V-shaped contact part; 4. Clamping cavity; 5. Female connector; 6. Socket hole; 7. Terminal receiving cavity; 8. Socket interface; 9. Pin. Detailed Implementation
[0029] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0030] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0032] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.
[0033] Example 1
[0034] This embodiment provides, as follows: Figure 1-5The diagram shows a spring-loaded terminal structure for connecting with a pin 9. It includes a spring body 1 and at least a pair of elastic arms 2 extending from the spring body 1. The pair of elastic arms 2 together form a square contact structure 3 that engages with the pin 9. The square contact structure 3 has a clamping cavity 4 for holding and gripping the pin 9. The opening direction of the clamping cavity 4 is perpendicular to the axial direction of the spring body 1. The square contact structure 3 forms at least four-point contact with the outer peripheral wall of the pin 9 inserted into its clamping cavity 4.
[0035] The above-described implementation is the core technical solution of this embodiment. A pair of elastic arms 2 enclose a square contact structure 3. The square contact structure 3 has a clamping cavity 4 that holds and accommodates the pin 9, allowing it to form at least four points of contact with the outer peripheral wall of the pin 9. Compared to the traditional double-bubble contact form, this design significantly increases the contact area, reduces the current density per unit area, avoids contact performance degradation due to high temperature, and greatly improves the reliability and stability of circuit conduction. The spring-loaded terminal structure of this technical solution, through the square contact structure 3 and the clamping cavity 4, forms a multi-dimensional clamping effect on the pin 9. The limiting mechanism applies constraint forces to the pin 9 from four directions simultaneously through the square contact structure 3, and, in conjunction with the clamping force of the elastic arm 2, precisely fixes the position of the pin 9. This effectively prevents the pin 9 from shifting or shaking during insertion, removal, or use. The insertion and removal forces and contact stress of the pin 9 can be evenly distributed to the four contact points and the two elastic arms 2 through the square inner wall, avoiding stress concentration. This effectively resists vibration and impact, ensuring that the spring terminal can maintain excellent resilience and contact pressure even after multiple insertions and removals, significantly improving the service life and long-term stability of the spring terminal.
[0036] In this solution, the opening direction of the clamping cavity is designed to be perpendicular to the spring axis, allowing the connector to be laid out in the device along a direction perpendicular to the traditional axis. This directly matches new connection scenarios where the insertion direction is perpendicular to the spring axis, without requiring additional modifications to the overall spring structure. This breaks through the application limitations of traditional spring axial insertion and extraction, expands the application range of connectors in high-density, small-space devices, and meets the integrated layout requirements of modern electronic devices.
[0037] The following is combined with Figure 1-3 The specific configuration of the square contact structure is explained in detail:
[0038] The square contact structure 3 includes two V-shaped contact portions 31 formed by bending a pair of elastic arms 2 relative to each other, and a clamping cavity 4 formed between the two V-shaped contact portions 31. The two V-shaped contact portions 31 are symmetrically distributed. The clamping cavity 4 is tapered along the insertion direction of the pin 9. The inlet size of the clamping cavity 4 is larger than its inner cavity size. The advantage of this design is that by forming a tapered square clamping cavity 4 between the two V-shaped contact portions 31, this V-shaped contact portion 31 can effectively transmit and disperse the radial insertion and extraction force along its arm to the root, greatly enhancing the mechanical strength and deformation resistance of the structure. The two V-shaped contact portions 31 naturally form a four-point contact with the pin 9 inserted into the clamping cavity 4, ensuring the connection... The contact pressure is uniform. The clamping cavity 4 adopts a tapered design to provide a funnel-shaped guide channel for the pin 9. The narrower cavity wall provides sufficient clamping force. When the pin 9 is initially inserted into the clamping cavity 4, the wider entrance end can easily accommodate the pin 9. The pin 9 can be guided to move towards the center of the clamping cavity 4 without precise alignment. As the pin goes deeper into the clamping cavity 4, it gradually fits against the outer peripheral wall of the pin through the two V-shaped contact parts 31. The contact pressure increases linearly and the clamping force increases slowly, ensuring that the pin 9 will not wobble during insertion. At this time, the elastic arm 2 is under pressure and is in an elastic pre-tightened state. The square contact structure 3 ensures that the contact point with the pin always maintains a continuous and constant positive force through the pre-tightening force of the elastic arm 2, thus improving the connection stability.
[0039] In a further preferred configuration, a clamping cavity 4 with a square or rhomboid cross-section is formed by two V-shaped contact portions 31. The inner wall of the clamping cavity 4 is formed by the inner sidewalls of the two V-shaped contact portions 31. By setting the inner sidewall of at least one V-shaped contact portion 31 at an inclination angle of 0.5° to 1.5° with the insertion direction of the pin 9, a tapered clamping cavity 4 is formed. Specifically, the clamping cavity 4 has four inner contact walls that form four-point contact with the pin 9 inserted therein. All four inner contact walls are provided with the inclination angle, which is preferably 0.6°. Thus, the inner sidewalls of the two V-shaped contact portions 31 are inclined planar structures that extend according to the inclination angle. The advantage of this structural design is that the reduced shape of the clamping cavity 4 is formed by designing its four contact inner walls with the same inclination angle, which significantly reduces the initial insertion force of the pin and ensures that the radial force on the pin in the circumferential direction is completely uniform and symmetrical during insertion and after connection. This ensures that the spring terminal provides a stable holding force after the pin 9 is connected. The clamping cavity 4 designed in this way forms a uniformly distributed four-point contact with the pin through the four contact inner walls. All the stress and wear generated by the pin insertion and removal cycle are equally distributed through the four contact points, resulting in better vibration resistance. Furthermore, the current is evenly distributed through the four contact points, significantly reducing the current density and heat load of each contact point, avoiding local overheating, improving current carrying capacity, and ensuring the performance and long-term reliability of the entire connector electrical connection.
[0040] like Figure 3 As shown, the pair of elastic arms 2 and their V-shaped contact portions 31 are integrally stamped with the spring body 1. The end of the spring body 1 away from the elastic arms 2 is provided with a wiring portion 11. The wiring portion 11 is provided with a wire groove structure for crimping wires. The ends of the pair of elastic arms 2 away from the spring body 1 are connected to form a U-shaped socket end 12. The socket end 12 can be axially inserted and pulled into connection with the pins 9 of a traditional connector. The clamping cavity 4 and the pins 9 are inserted and pulled into connection along the axis perpendicular to the spring. The connector designed in this way can meet two connection requirements and has good practicality.
[0041] Example 2
[0042] This embodiment provides, as follows: Figure 4-5 The connector assembly shown includes a female connector 5, a male connector, and the spring-loaded terminal structure described in Embodiment 1 (attached). Figure 4(A represents the spring terminal structure). The spring terminal structure is fixedly housed within the female connector 5. It includes a square contact structure 3 formed by a pair of elastic arms 2. The square contact structure 3 forms a clamping cavity 4. The female connector 5 is provided with a socket 6 that is coaxially connected to the clamping cavity 4. The male connector is provided with a pin 9 that passes through the socket 6 and is inserted into the square clamping cavity 4. The female connector 5 in this embodiment adopts a spring terminal structure with a square contact structure 3, and therefore naturally has all the advantages brought about by the above-mentioned spring terminal structure. The two V-shaped contact parts 31 of the square contact structure 3 form a symmetrical four-point contact with the outer periphery of the pin 9, which can evenly distribute the vibration load to the whole of the elastic arm 2, significantly enhancing the vibration / impact resistance, making the connection more reliable, and improving the current carrying capacity. In addition, the clamping cavity 4 formed by the two V-shaped contact parts 31 is designed to taper along the insertion direction of the pin 9. The narrower cavity wall obtains sufficient clamping force, so that the small displacement of the pin 9 generated during vibration is converted into additional clamping force on the V-shaped contact parts. Combined with the elastic restoring force of the elastic arm 2, it can effectively suppress the loosening of the pin, improve the mechanical performance and service life of the product.
[0043] For further optimization settings, please refer to... Figure 5 The female connector 5 has multiple terminal receiving cavities 7 for installing the spring-loaded terminal structure. Each terminal receiving cavity 7 has a wiring port and a plug interface 8 extending from both ends of the female connector 5. The U-shaped plug end 12 of the spring-loaded terminal structure is located at the plug interface 8, and its wiring portion 11 is located within the wiring port. The female connector 5 can be axially plugged and unplugged with the standard pin 9 of the male connector in the horizontal direction, similar to a conventional connector, via the plug end 12. Furthermore, to facilitate vertical plugging and unplugging between the female connector 5 and the male connector, a plug hole 6 is located at the top or bottom of the female connector 5, and the axis of the plug hole 6 is aligned with the central axis of the terminal receiving cavity 7. The core is vertically arranged, and the opening direction of the clamping cavity 4 of the spring terminal design is perpendicular to the spring axis. With this structural design, the female connector 5 allows the male connector pin 9 to be inserted vertically into the square clamping cavity 4 through the insertion hole 6, and forms a clamping engagement with the square contact structure 3 inside, thereby achieving electrical contact with the spring terminal structure. The connector product designed with this technical solution has two independent connection methods, which can not only adapt to different installation scenarios, but also maintain stability in environments with strong vibration, thus breaking through the application limitations of traditional spring axial insertion and extraction, expanding the application range of connectors in high-density, small-space equipment, and meeting the integrated layout requirements of modern electronic equipment.
[0044] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.
Claims
1. A spring-loaded terminal structure for connecting with a pin (9), characterized in that, include: Insert spring body (1); At least one pair of elastic arms (2) extend from the spring body (1) and together enclose a square contact structure (3) that engages with the pin (9). The square contact structure (3) has a clamping cavity (4) for holding and accommodating the pin (9). The opening direction of the clamping cavity (4) is perpendicular to the axial direction of the spring body (1). The square contact structure (3) forms at least four-point contact with the outer peripheral wall of the pin (9) inserted into its clamping cavity (4).
2. The spring-loaded terminal structure according to claim 1, characterized in that: The square contact structure (3) includes two V-shaped contact portions (31) formed by bending a pair of elastic arms (2) relative to each other, and a clamping cavity (4) formed between the two V-shaped contact portions (31), the two V-shaped contact portions (31) being symmetrically distributed.
3. The spring-loaded terminal structure according to claim 2, characterized in that: The clamping cavity (4) is tapered along the insertion direction of the pin (9), and the size of the inlet end of the clamping cavity (4) is larger than its inner cavity size.
4. The spring-loaded terminal structure according to claim 3, characterized in that: The inner wall of the clamping cavity (4) is formed by the inner walls of two V-shaped contact portions (31), by setting the inner wall of at least one V-shaped contact portion (31) at an angle of 0.5° to 1.5° with the insertion direction of the pin (9).
5. The spring-loaded terminal structure according to claim 4, characterized in that: The clamping cavity (4) has four inner contact walls that form four-point contact with the inserted pin (9), and each of the four inner contact walls is provided with the tilt angle, which is 0.6°.
6. The spring-loaded terminal structure according to claim 5, characterized in that: The two V-shaped contact portions (31) together form a clamping cavity (4) with a square or rhomboid cross-section, and the inner sidewalls of the two V-shaped contact portions (31) are inclined plane structures that extend according to the inclined angle.
7. A spring-loaded terminal structure according to any one of claims 1-6, characterized in that: The pair of elastic arms (2) and their V-shaped contact portions (31) are integrally stamped with the spring body (1), and the end of the spring body (1) away from the elastic arms (2) is provided with a wiring portion (11).
8. The spring-loaded terminal structure according to claim 7, characterized in that: The ends of the pair of elastic arms (2) away from the spring body (1) are connected to form a U-shaped insertion end (12).
9. A connector assembly, characterized in that, The device includes a female connector (5), a male connector, and a spring terminal structure as described in any one of claims 1-8. The spring terminal structure is fixedly housed within the female connector (5) and includes a square contact structure (3) formed by a pair of elastic arms (2). The female connector (5) is provided with a socket (6) communicating with a clamping cavity (4) formed by the square contact structure (3). The male connector is provided with a pin (9) that passes through the socket (6) and is inserted into the square clamping cavity (4).
10. The connector assembly according to claim 9, characterized in that: The female connector (5) is provided with a plurality of terminal receiving cavities (7) for installing the spring-loaded terminal structure. The terminal receiving cavity (7) has a wiring port and a plug interface (8) extending to both ends of the female connector (5). The U-shaped plug end (12) of the spring-loaded terminal structure is located at the plug interface (8). The plug hole (6) is located at the top or bottom of the female connector (5). The axis of the plug hole (6) is perpendicular to the central axis of the terminal receiving cavity (7).