Plug connector

Abstract

The invention provides a plug connector, comprising an insulating body which comprises a plugging part and a holding part, and the plugging part is internally provided with a plugging cavity; the first terminal group and the second terminal group are fixed in the holding part at intervals up and down along the thickness direction, and each conductive terminal in the first terminal group and the second terminal group comprises an elastic sheet part which extends along the plugging direction and is exposed in the plugging cavity; the shielding piece comprises a middle plate part, an elastic arm, a first extension arm, a first fixing part, a second extension arm and a second fixing part; the middle plate part is fixed in the holding part and located between the first terminal group and the second terminal group, and the elastic arms are formed on the two sides of the middle plate part in the width direction; the first fixing part and the second fixing part are exposed out of the holding part; and the metal shell is sleeved outside the insulating body, and the two sides of the metal shell in the thickness direction are fixedly connected with the first fixing part and the second fixing part respectively. The plug connector provided by the invention has relatively good structural stability and electronic shielding effect.

Description

Technical Field

[0001] This invention relates to the field of connector technology, and more specifically to a plug connector. Background Technology

[0002] With the miniaturization and high-speed development of electronic devices, the Type-C interface has become the mainstream standard due to its advantages such as reversible plugging, high transmission rate (such as USB4 / Thunderbolt), and high-power fast charging (such as PD 3.1). Electronic devices typically use socket connectors, while transmission lines generally use plug connectors.

[0003] Plug connectors generally consist of a metal housing, an insulating body, and terminal assemblies. The metal housing is a crucial component providing core functions such as electromagnetic shielding, mechanical support, and heat conduction. The stability of the connection between the metal housing and the internal structure is essential for the electrical and mechanical reliability and durability of the plug connector. Currently, the metal housing is typically secured to the insulating body using claws within the metal housing. However, this structure is prone to slight movements over long-term use, failing to meet the stability requirements of the plug connector. Summary of the Invention

[0004] Therefore, in order to overcome the above problems, the present invention provides a plug connector in which the shielding component is fixedly connected to the metal shell, and has high structural stability and superior electronic shielding effect.

[0005] The plug connector provided by the present invention includes:

[0006] An insulating body includes a plug-in portion and a retaining portion arranged front to back along the plugging direction, and the plug-in portion is provided with a plugging cavity.

[0007] The first terminal group and the second terminal group are fixedly fixed in the holding part at intervals along the thickness direction, and each conductive terminal in the first terminal group and the second terminal group includes a spring part that extends along the insertion direction and is exposed in the insertion cavity.

[0008] The shielding component includes a middle plate portion, an elastic arm, a first extension arm, a first fixing portion, a second extension arm, and a second fixing portion. The middle plate portion is fixed within a holding portion and located between a first terminal group and a second terminal group. The elastic arm is formed on both sides of the middle plate portion in the width direction and extends along the insertion direction to the insertion portion and is exposed in the insertion cavity. The first extension arm is formed by bending and extending the end of the elastic arm away from the insertion portion toward a first side in the thickness direction, and the end of the first extension arm away from the elastic arm is bent to form a first fixing portion exposed outside the holding portion. One side of the first fixing portion is bent and extended toward a second side in the thickness direction to form a second extension arm, and the end of the second extension arm away from the first fixing portion is bent to form a second fixing portion exposed outside the holding portion.

[0009] A metal outer shell is fitted over the insulating body, and its two sides in the thickness direction are fixedly connected to the first fixing part and the second fixing part, respectively.

[0010] Optionally, the shielding component further includes a first latching arm and a second latching arm, which are formed vertically on the second extension arm along the thickness direction. The first latching arm and the second latching arm extend along the insertion direction and form a latching groove between them suitable for latching with the corresponding circuit board.

[0011] Optionally, an abutting protrusion is provided on the outer side of the end of the elastic arm near the middle plate in the width direction, the abutting protrusion protruding from the insulating body and abutting against the metal shell.

[0012] Optionally, the plug connector also includes:

[0013] The insulating component is fixed within the middle plate portion of the first terminal group, the second terminal group, and the shielding component. The insulating component is fixed within the holding portion of the insulating body.

[0014] Optionally, an injection positioning hole is provided in the middle of the middle plate, and the projection of each conductive terminal on the middle plate falls within the range of the injection positioning hole.

[0015] Optionally, the insertion part is provided with several receiving grooves that communicate with the insertion cavity, and the spring parts of each conductive terminal are respectively located in the corresponding receiving grooves and can bounce along the thickness direction in the receiving grooves.

[0016] Optionally, a limiting groove is provided at the front end of the receiving groove in the insertion direction, and a limiting part is correspondingly provided at the front end of the spring part in the insertion direction, so that the spring part's movement toward the insertion cavity is limited by the limiting groove and the limiting part.

[0017] Optionally, a contact portion is provided at one end of the spring piece near the limiting portion, and the contact portion protrudes toward the insertion cavity.

[0018] Optionally, the conductive terminals in the first terminal group are offset from the conductive terminals in the second terminal group.

[0019] The technical solution of this invention has the following advantages:

[0020] 1. The plug connector provided by the present invention, by setting the shielding component therein including a middle plate, an elastic arm, a first extension arm, a first fixing part, a second extension arm, and a second fixing part, and making the first fixing part and the second fixing part exposed on both sides of the insulation body in the thickness direction, allows the metal shell to be fixedly connected to the first fixing part and the second fixing part (e.g., welded), thereby improving the connection stability between the metal shell and the shielding component, i.e., to the insulation body (the shielding component is fixed inside the insulation body); at the same time, by setting the middle plate between the first terminal group and the second terminal group, signal isolation between the first terminal group and the second terminal group is achieved; and by setting the first fixing part and the second fixing part integrally formed with the middle plate and fixedly connected to the metal shell, a continuous shielding layer is formed between the shielding component and the metal shell, which can prevent internal noise leakage or external interference intrusion, and avoid signal reflection and crosstalk; ultimately, the plug connector has high structural stability and superior electromagnetic shielding effect.

[0021] 2. The plug connector provided by the present invention further includes a first snap-fit ​​arm and a second snap-fit ​​arm by setting a shield, and a snap-fit ​​groove between the two is provided to be suitable for snapping with the corresponding circuit board, which can improve the connection stability of the plug connector when connected to the corresponding circuit board.

[0022] 3. The plug connector provided by the present invention has an abutting protrusion on the outer side of the elastic arm, and the abutting protrusion protrudes out of the insulating body and abuts against the metal shell. This can improve the structural strength of the elastic arm, increase the electrical contact points between the shielding component and the metal shell, and further improve the electromagnetic shielding effect of the plug connector.

[0023] 4. The plug connector provided by the present invention has an injection positioning hole in the middle of the middle plate, and the projections of each conductive terminal in the first terminal group and the second terminal group on the middle plate fall within the range of the injection positioning hole. This facilitates the relative positioning of the middle plate and each conductive terminal, facilitates the molding of the insulating part, and improves the production and assembly convenience of the plug connector. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 and Figure 2 This is a schematic diagram of the structure of the plug connector provided in an embodiment of the present invention;

[0026] Figure 3 for Figure 1 Sectional view at point AA;

[0027] Figure 4 for Figure 1 Sectional view at point BB;

[0028] Figure 5 This is a schematic diagram showing the positional and structural relationship between the insulating body and the shielding component in a plug connector provided in an embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram showing the positional and structural relationship between the shielding component and the first terminal group and the second terminal group in the plug connector provided in an embodiment of the present invention.

[0030] Figure 7 This is a schematic diagram of a specific structure of a shielding component provided in an embodiment of the present invention;

[0031] Figure 8 for Figure 2 Sectional view at CC;

[0032] Figure 9 This is a schematic diagram of the specific structure of the retaining insulating member provided in an embodiment of the present invention;

[0033] Figure 10 This is a schematic diagram illustrating the connection relationship between the plug connector and the corresponding circuit board provided in an embodiment of the present invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] 100 - Insulating body;

[0036] 110 - Insertion part; 110a - Insertion cavity; 110b - Receiving groove; 110c - Limiting groove; 120 - Holding part;

[0037] 210 - First terminal group; 220 - Second terminal group; 200a - Spring contact part; 200b - Soldering part; 200c - Limiting part; 200d - Contact part;

[0038] 300 - Shielding component; 310 - Middle plate section; 310a - Injection molding positioning hole; 320 - Elastic arm; 320a - Snap-fit ​​protrusion; 320b - Abutment protrusion; 330 - First extension arm; 340 - First fixing part; 350 - Second extension arm; 360 - Second fixing part; 370 - First snap-fit ​​arm; 380 - Second snap-fit ​​arm; 300a - Snap-fit ​​groove;

[0039] 400 - Metal casing;

[0040] 500 - Retaining Insulator;

[0041] 600 - Circuit board. Detailed Implementation

[0042] The technical solution of the present invention 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 the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 invention based on the specific circumstances.

[0045] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0046] Furthermore, to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features not related to the currently considered best mode for carrying out the invention, or those features not related to implementing the invention) may be described. Moreover, the technical features involved in the different embodiments of the invention described below may be combined with each other as long as they do not conflict with each other.

[0047] Please refer to Figures 1-8 This is a schematic diagram of a plug connector provided in an embodiment of the present invention. The plug connector is applied to components suitable for connecting to electronic devices, such as transmission lines, USB flash drives, and hard drives, and is used to connect to the corresponding socket connector on the electronic device to perform data transmission between the electronic device and other devices, or to replenish the power of the electronic device.

[0048] Please refer to Figures 1-8 The plug connector provided in this embodiment includes an insulating body 100, a first terminal group 210, a second terminal group 220, a shield 300, and a metal shell 400.

[0049] Please refer to Figure 3 and Figure 5The insulating body 100 includes a plug-in portion 110 and a retaining portion 120 arranged front to back along the plugging direction. The plug-in portion 110 is provided with a plugging cavity 110a. The first terminal group 210 and the second terminal group 220 are fixedly fixed in the retaining portion 120 at intervals along the thickness direction. Each conductive terminal in the first terminal group 210 and the second terminal group 220 includes a spring portion 200a that extends along the plugging direction and is exposed in the plugging cavity 110a.

[0050] Here, the directions in this embodiment are explained. The front end of the insertion direction refers to the end that is reached first along the insertion direction (that is, the end closer to the opening of the insertion cavity 110a). Correspondingly, the rear end of the insertion direction refers to the end that is reached later along the insertion direction. The length direction refers to the direction that is the same as the insertion direction (that is, the direction of length). Figure 2 The X-axis direction shown in the figure); the width direction refers to the reverse arrangement of the conductive terminals in the first terminal group 210 (i.e., Figure 2 The Y-axis direction shown in the figure); the thickness direction refers to the vertical position direction of the first terminal group 210 and the second terminal group 220 (i.e., Figure 2 (The Z-axis direction is shown in the figure).

[0051] Specifically, such as Figure 3 As shown, the insertion part 110 is provided with a plurality of receiving grooves 110b that communicate with the insertion cavity 110a. The spring part 200a of each conductive terminal is located in the corresponding receiving groove 110b and can bounce along the thickness direction in the receiving groove 110b.

[0052] Specifically, such as Figure 3 As shown, the insertion cavity 110a is disposed at the front end of the insertion portion 110 in the insertion direction. Those skilled in the art should understand that in order to enable the spring portion 200a of the conductive terminal to move smoothly, the receiving groove 110b not only includes the portion extending at the insertion cavity 110a, but also extends backward along the insertion direction within the insertion portion 110 until it reaches the holding portion 120. At this time, the conductive terminal is fixed by the holding portion 120, and the receiving groove 110b no longer extends.

[0053] Specifically, such as Figure 3 As shown, the conductive terminal also includes a solder portion 200b extending from the rear end of the insulating body 100 in the insertion direction, which is adapted to be soldered to a pad on the corresponding circuit board 600.

[0054] Specifically, such as Figure 1As shown, the conductive terminals in the first terminal group 210 and the conductive terminals in the second terminal group 220 can be staggered. In a specific implementation, the plug connector in this embodiment can be a 4-pin plug connector. In this case, there are two conductive terminals in both the first terminal group 210 and the second terminal group 220, and the four conductive terminals are staggered in the thickness direction.

[0055] In specific implementation, to prevent the conductive terminals of the plug connector in this embodiment from entering the mating cavity 110a during use and being damaged due to pressure during mating, thus affecting the service life of the plug connector in this embodiment, such as... Figure 3 As shown, a limiting groove 110c can be provided at the front end of the receiving groove 110b in the insertion direction, and a limiting part 200c is provided at the front end of the spring part 200a in the insertion direction. The spring part 200a is limited by the limiting groove 110c and the limiting part 200c when it bounces toward the insertion cavity 110a. At this time, the end of the conductive terminal (i.e. the limiting part 200c) is blocked by the groove wall of the limiting groove 110c on the side close to the insertion cavity 110a and will not enter the insertion cavity 110a.

[0056] In practical implementation, to ensure smooth and efficient movement of the conductive terminals when the plug connector mates with the corresponding socket connector, and to guarantee high electrical contact stability between the plug connector and the terminals in the corresponding socket connector, such as... Figure 3 As shown, a contact portion 200d is provided at one end of the spring portion 200a near the limiting portion 200c, and the contact portion 200d protrudes toward the insertion cavity 110a; in a specific implementation, as... Figure 3 As shown, the end face of the contact portion 200d facing the insertion cavity 110a can be set as an arc-shaped surface.

[0057] Similarly, such as Figure 4 As shown, the two elastic arms 320 in the shield 300 can be provided with snap-fit ​​protrusions 320a at their front ends in the insertion direction so that the elastic arms 320 can make full electrical contact with the middle plate in the corresponding socket connector.

[0058] Please refer to Figures 5-8The shielding member 300 includes a middle plate portion 310, an elastic arm 320, a first extension arm 330, a first fixing portion 340, a second extension arm 350, and a second fixing portion 360; wherein, the middle plate portion 310 is fixed within the holding portion 120 and located between the first terminal group 210 and the second terminal group 220, the elastic arm 320 is formed on both sides of the middle plate portion 310 in the width direction, and extends along the insertion direction to the insertion portion 110 and is exposed in the insertion cavity 110a; the first extension arm 330 is... The elastic arm 320 extends and bends towards a first side in the thickness direction at one end away from the insertion portion 110, and the first extension arm 330 extends and bends towards the first fixed portion 340 at one end away from the elastic arm 320 to form a first fixed portion 340 exposed outside the holding portion 120; one side of the first fixed portion 340 extends and bends towards a second side in the thickness direction to form a second extension arm 350, and the end of the second extension arm 350 extends and bends away from the first fixed portion 340 to form a second fixed portion 360 exposed outside the holding portion 120.

[0059] Please refer to Figure 3 and Figure 8 The metal outer shell 400 is fitted over the insulating body 100, and its two sides in the thickness direction are fixedly connected to the first fixing part 340 and the second fixing part 360 respectively.

[0060] Specifically, the metal casing 400 and the first fixing part 340 and the second fixing part 360 can be fixed by welding.

[0061] In specific implementation, to further improve the structural stability of the plug connector in this embodiment, such as... Figure 5 and Figure 7 As shown, the shielding component 300 may also include a first snap-fit ​​arm 370 and a second snap-fit ​​arm 380. The first snap-fit ​​arm 370 and the second snap-fit ​​arm 380 are formed vertically on the second extension arm 350 along the thickness direction. The first snap-fit ​​arm 370 and the second snap-fit ​​arm 380 extend along the insertion direction, and a snap-fit ​​groove 300a suitable for snapping with the corresponding circuit board 600 is formed between them.

[0062] At this time, as Figure 10 As shown, the soldering part of the conductive terminal in the first terminal group 210 and the first snap-fit ​​arm 370 can be soldered to the upper surface pad of the corresponding circuit board 600. Correspondingly, the soldering part of the conductive terminal in the second terminal group 220 and the second snap-fit ​​arm 380 can be soldered to the lower surface pad of the corresponding circuit board 600.

[0063] It should be noted that the extended descriptions of the various components in the shielding member 300 in this embodiment (e.g., the first extension arm 330 is formed by extending the elastic arm 320, the first fixing part 340 is formed by extending the first extension arm 330, etc.) are only used to indicate the structural features (positional relationship and connection relationship) of the various components in the shielding member 300, and do not indicate the order of preparation of the various components. The shielding member 300 in this embodiment can be an integrally molded part.

[0064] In specific implementation, to improve the ease of production and assembly of the plug connector in this embodiment, such as Figure 8 and Figure 9 As shown, the plug connector in this embodiment may also include a retaining insulating member 500. The middle plate portion 310 of the first terminal group 210, the second terminal group 220 and the shield 300 are all retained in the retaining insulating member 500. The retaining insulating member 500 is fixed in the retaining portion 120 of the insulating body 100.

[0065] At this time, as Figure 6 and Figure 7 As shown, the middle plate portion 310 can also be provided with an injection positioning hole 310a in the middle, and the projection of each conductive terminal on the middle plate portion 310 falls within the range of the injection positioning hole 310a, so as to facilitate the relative positioning and fixing of the middle plate portion 310 and each conductive terminal before molding and holding the insulating part 500, thereby further improving the production and assembly convenience of the plug connector in this embodiment.

[0066] Specifically, the injection positioning hole 310a can be a single hole with a larger diameter or multiple holes with relatively smaller diameters, as long as it can meet the positioning and fixing of the conductive terminal in the specific application scenario.

[0067] In specific implementation, to further improve the electromagnetic shielding effect of the plug connector in this embodiment, such as... Figure 4 and Figure 7 As shown, an abutting protrusion 320b can be provided on the outer side of the end of the elastic arm 320 near the middle plate portion 310 in the width direction. The abutting protrusion 320b protrudes out of the insulating body 100 and abuts against the metal shell 400. The abutting protrusion 320b can increase the structural strength of the elastic arm 320 while increasing the electrical contact points between the shielding member 300 and the metal shell 400, thereby improving the electromagnetic shielding effect of the plug connector in this embodiment.

[0068] In this embodiment, the plug connector includes a shield 300 comprising a middle plate 310, an elastic arm 320, a first extension arm 330, a first fixing part 340, a second extension arm 350, and a second fixing part 360. The first fixing part 340 and the second fixing part 360 are exposed on opposite sides of the insulating body 100 in the thickness direction, allowing the metal shell 400 to be fixedly connected to the first fixing part 340 and the second fixing part 360 (e.g., by welding). This improves the connection between the metal shell 400 and the shield 300, i.e., the insulating body 100 (where the shield 300 is fixed to the insulating body 100). The connection between the inner and outer terminals is stable; at the same time, by setting the middle plate 310 between the first terminal group 210 and the second terminal group 220, signal isolation between the first terminal group 210 and the second terminal group 220 is achieved. Furthermore, by setting the first fixing part 340 and the second fixing part 360 integrally formed with the middle plate 310 and fixedly connected to the metal shell 400, a continuous shielding layer is formed between the shielding member 300 and the metal shell 400, which can prevent internal noise leakage or external interference intrusion, and avoid signal reflection and crosstalk; ultimately, the plug connector has high structural stability and excellent electromagnetic shielding effect.

[0069] 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 scope of protection of this invention.

Claims

1. A plug connector, characterized in that, Also includes: An insulating body includes a plug-in portion and a retaining portion arranged front to back along the plugging direction, and the plug-in portion is provided with a plugging cavity; The first terminal group and the second terminal group are fixedly fixed in the holding part at intervals along the thickness direction, and each conductive terminal in the first terminal group and the second terminal group includes a spring piece extending along the insertion direction and exposed in the insertion cavity. A shielding component includes a middle plate portion, an elastic arm, a first extension arm, a first fixing portion, a second extension arm, and a second fixing portion. The middle plate portion is fixed within the holding portion and located between the first terminal group and the second terminal group. The elastic arm is formed on both sides of the middle plate portion in the width direction and extends along the insertion direction to the insertion portion and is exposed within the insertion cavity. The first extension arm is formed by bending and extending the end of the elastic arm away from the insertion portion toward a first side in the thickness direction, and the end of the first extension arm away from the elastic arm is bent to form the first fixing portion exposed outside the holding portion. One side of the first fixing portion is bent and extended toward a second side in the thickness direction to form the second extension arm, and the end of the second extension arm away from the first fixing portion is bent to form the second fixing portion exposed outside the holding portion. A metal outer shell is fitted over the insulating body, and its two sides in the thickness direction are respectively fixedly connected to the first fixing part and the second fixing part.

2. The plug connector according to claim 1, characterized in that, The shielding component further includes a first snap-fit ​​arm and a second snap-fit ​​arm, which are formed vertically on the second extension arm along the thickness direction. The first snap-fit ​​arm and the second snap-fit ​​arm extend along the insertion direction and form a snap-fit ​​groove between them suitable for snapping with the corresponding circuit board.

3. The plug connector according to claim 1 or 2, characterized in that, An abutting protrusion is provided on the outer side of the elastic arm near the middle plate in the width direction. The abutting protrusion protrudes from the insulating body and abuts against the metal shell.

4. The plug connector according to claim 1, characterized in that, Also includes: The insulating member is fixed in place, and the middle plate portion of the first terminal group, the second terminal group, and the shielding member are all fixed in the insulating member. The insulating member is fixed in the holding portion of the insulating body.

5. The plug connector according to any one of claims 1-4, characterized in that, The middle plate is provided with an injection positioning hole, and the projection of each conductive terminal on the middle plate falls within the range of the injection positioning hole.

6. The plug connector according to any one of claims 1-5, characterized in that, The insertion part is provided with a plurality of receiving grooves that communicate with the insertion cavity. The spring parts of each conductive terminal are respectively located in the corresponding receiving grooves and can bounce along the thickness direction in the receiving grooves.

7. The plug connector according to claim 6, characterized in that, The receiving groove is provided with a limiting groove at its front end in the insertion direction, and the spring part is provided with a corresponding limiting part at its front end in the insertion direction. The spring part's movement toward the insertion cavity is limited by the limiting groove and the limiting part.

8. The plug connector according to claim 7, characterized in that, The end of the spring piece near the limiting part is provided with a contact part, which protrudes toward the insertion cavity.

9. The plug connector according to any one of claims 1-8, characterized in that, The conductive terminals in the first terminal group are misaligned with the conductive terminals in the second terminal group.

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