Sockets and plug-socket assemblies to prevent plugs from coming loose
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-20
- Publication Date
- 2026-08-11
AI Technical Summary
[0004]但是，该种方案，其插头上需设置两块锁止板，且两块锁止板是在插头端面上，与插脚同向延伸，显然，其只能适配在专用的插座上，不能插入其他插座使用，而且其对插头结构改动较多，不利于插头成本的控制；其插座上需设置相应的锁舌，为了实现锁舌的安装，插座背侧的插接通道旁侧固定设有支撑板，支撑板上固定设有转轴，转轴上转动连接有翻转板，锁舌固定在翻转板面向插接通道一侧的侧壁上，转轴上套设有扭簧，扭簧的一端与支撑板固定，其另一端与翻转板固定连接，使用时，锁止板穿过插接通道插接至插座的内部与锁舌形成配合， 可见插座结构也改动较多，尤其是插接通道在插座端面上，占据插座端面原本布置插脚孔的区域，局限插座的零件布局灵活性
[0018]本实用新型与现有技术相比具有明显的优点和有益效果，具体而言，由上述技术方案可知，其主要是通过对插座的结构进行改进，实现对插头的锁定，防止插头被非正常拔出，尤其是，其结构巧妙合理，不会占用插座原有的插接端面布置区域，不会影响原有插座的零件布局，只需在原有插头本体的外壳的周侧凹设一锁扣槽，不会对插头原有结构造成变动，对原有插头而言，只是在外壳的注塑成型时多一个锁扣槽，相当于是外壳的注塑模具局部少量修改即可，基本上不会造成插头成本的增加，增加了锁扣槽的插头同样通用于其它不具锁止功能的插座，因此，该技术方案适于推广应用。
Smart Images
Figure CN224626058U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of sockets, and in particular to a socket and plug-socket assembly for preventing plugs from coming loose. The socket is mainly, but not limited to, power strips. Background Technology
[0002] Taking a power socket as an example, it typically includes a socket body with multiple exposed prong holes. Each prong hole contains a conductive component. In use, the plug's prongs are inserted into these prong holes to establish electrical connection. Currently, most power sockets lack a locking mechanism for the plug, allowing it to be freely removed. In actual use, if the plug and cable are pulled, the plug can easily detach from the socket, disconnecting the power connection. This is especially dangerous outdoors, as a loose plug can easily lead to safety accidents.
[0003] Based on this, industry professionals have proposed a solution: a locking mechanism is installed between the socket and the plug. Specifically, a latch is installed on the socket, and a locking plate is installed on the plug. The locking plate has a locking hole for the latch to insert into. Thus, when the plug and socket are locked, the latch is inserted into the locking hole. Simultaneously, to release the latch and locking hole, an unlocking device is provided on the plug to push the locking plate to move, disengaging the latch from the locking hole.
[0004] However, this design requires two locking plates on the plug, extending in the same direction as the pins. Clearly, it can only be used with dedicated sockets and cannot be inserted into other sockets. Furthermore, it significantly alters the plug structure, hindering cost control. The socket also requires a corresponding locking tongue. To achieve this, a support plate is fixed to the side of the insertion channel on the back of the socket. A rotating shaft is fixed to the support plate, and a flip plate is rotatably connected to the shaft. The locking tongue is fixed to the side wall of the flip plate facing the insertion channel. A torsion spring is fitted on the shaft, with one end fixed to the support plate and the other end fixed to the flip plate. In use, the locking plate passes through the insertion channel and inserts into the socket to engage with the locking tongue. This also significantly alters the socket structure, especially since the insertion channel occupies the area originally designated for pin holes on the socket's end face, limiting the flexibility of the socket's component layout.
[0005] Furthermore, in actual use, this solution is prone to situations where users forget to push the lever after plugging the plug into the socket, making it difficult to ensure that the plug is locked effectively.
[0006] Therefore, it is necessary to research a new technical solution to address the above problems. Utility Model Content
[0007] In view of the above, this utility model addresses the deficiencies of the existing technology, and its main purpose is to provide a socket and plug-socket assembly that prevents the plug from becoming loose. It locks the plug and prevents it from being pulled out abnormally. In particular, its structure is ingenious and reasonable, and it does not occupy the original plug-in end face arrangement area of the socket. The compatible plug only needs to have a locking groove recessed on the periphery of the original plug body shell, without changing the original structure of the plug. The plug with the added locking groove is also compatible with other sockets without locking function. Therefore, this technical solution is suitable for widespread application.
[0008] To achieve the above objectives, the present invention adopts the following technical solution: A socket for preventing plug from coming loose includes a socket body, on which a button assembly and a latch assembly are provided; the button assembly includes a pressing member and a pressing latch located below the pressing member, and the latch assembly includes a locking tongue; The socket body is recessed with a recessed slot and a button slot. The bottom surface of the recessed slot is provided with multiple pin holes, and corresponding conductive parts are provided in the pin holes. The inner circumferential side of the recessed slot is recessed with a locking tongue groove. In the unlocked state, the pressing member is pressed to spring upward to a first height, the pressing latch remains in a first locking position to be supported under the pressing member, and the bolt is hidden in the bolt slot; In the locked state, the pressing member is pressed down to the second height, the pressing latch remains in the second locking position to support it below the pressing member, and the locking tongue extends out of the locking tongue slot to protrude into the recessed slot.
[0009] As a preferred embodiment, the pressing member has a downward-facing first inclined pushing surface; The latch assembly includes a latch seat and a latch seat retraction elastic member; one side of the latch seat has a second inclined push surface facing the pressing member, the second inclined push surface is located below the first inclined push surface and the two slide in contact with each other; the latch is disposed on the side of the latch seat opposite to the second inclined push surface, and the latch seat retraction elastic member acts between the latch seat and the socket body to provide a restoring force for the latch seat to translate toward the pressing member.
[0010] As a preferred embodiment, the latch assembly further includes a latch retraction elastic element, which acts between the latch and the latch seat to provide a restoring force for the latch to move away from the second inclined push surface. The side of the latch away from the second inclined push surface is provided with a guide slope or a guide arc surface.
[0011] As a preferred embodiment, the latch seat is provided with a latch mounting cavity, and a first guide limiting groove is provided through the end wall of the latch mounting cavity opposite to the second inclined push surface. The latch has a tongue portion extending from the side opposite to the second inclined push surface, and the tongue portion extends out from the first guide limiting groove.
[0012] As a preferred embodiment, a second guide limiting groove is also provided through the end wall of the latch mounting cavity opposite to the second inclined push surface. The second guide limiting groove is located below the first guide limiting groove. The bottom of the latch has a forward guiding block that extends into the second guide limiting groove.
[0013] As a preferred embodiment, the two side walls of the latch mounting cavity are respectively provided with a third guide limiting groove, and the two sides of the latch are respectively provided with a lateral guide block, which extends into the third guide limiting groove.
[0014] As a preferred embodiment, the socket body is also provided with an electronic switch, which is located below the pressing member; when the pressing member is pressed down to a second height, the pressing member simultaneously presses down to trigger the electronic switch.
[0015] As a preferred embodiment, the electronic switch is associated with the on / off state of the circuit of the conductive element within the pin hole; And / or: An indicator light is provided on the socket body or the pressing component, and the electronic switch is associated with the on / off state of the indicator light.
[0016] As a preferred embodiment, the socket body is further provided with a support plate and a circuit board, the electronic switch is disposed on the circuit board, the upper end of the support plate is connected to the upper shell of the socket body, the lower end of the support plate is connected to the circuit board, and the locking assembly is supported on the top of the support plate and can slide and move relative to the top surface of the support plate.
[0017] A plug and socket assembly includes a socket and a plug, wherein the socket is a socket for preventing plug detachment as described in any of the preceding claims, and the plug includes a plug body, the plug body including a housing and a plurality of prongs extending out of the housing, and the housing having a locking groove recessed on its periphery. The plug body is inserted into the recessed slot, and the pins are inserted into the pin holes. When the pressing member is pressed down to the second height, the locking tongue protrudes into the locking groove, and the plug body cannot be pulled out. When the pressing member is pressed to spring upward to a first height, the locking tongue retracts from the locking groove and is hidden in the locking tongue inlet groove, releasing the locking of the plug body, and the plug body can be pulled out.
[0018] Compared with the prior art, this utility model has obvious advantages and beneficial effects. Specifically, as can be seen from the above technical solution, it mainly achieves the locking of the plug by improving the structure of the socket, preventing the plug from being pulled out abnormally. In particular, its structure is ingenious and reasonable, and will not occupy the original plug-in end face arrangement area of the socket, nor will it affect the original socket component layout. It only requires a locking groove to be recessed on the periphery of the original plug body shell, without changing the original structure of the plug. For the original plug, it only requires adding a locking groove during the injection molding of the shell, which is equivalent to a minor modification to the injection mold of the shell. Basically, it will not increase the cost of the plug. The plug with the added locking groove is also applicable to other sockets without locking function. Therefore, this technical solution is suitable for widespread application.
[0019] To more clearly illustrate the structural features and effects of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description
[0020] Figure 1 This is a perspective view of a plug and socket according to an embodiment of the present invention (in an unplugged state). Figure 2 This is a cross-sectional view of a plug and socket according to an embodiment of the present invention (in an unplugged state). Figure 3 This is an exploded view of a socket according to an embodiment of the present utility model; Figure 4 This is a partial cross-sectional view of a socket according to an embodiment of the present invention; Figure 5 This is an exploded view of the button assembly and the latch assembly according to an embodiment of the present utility model; Figure 6 This is an exploded view of the locking assembly according to an embodiment of the present utility model; Figure 7 This is a perspective view of the pressing component according to an embodiment of the present utility model. Detailed Implementation
[0021] Please refer to Figures 1 to 7 As shown, it illustrates the specific structure of an embodiment of the present invention.
[0022] In the description of this utility model, it should be noted that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model.
[0023] A socket for preventing plug loosening includes a socket body 100, on which a button assembly 110 and a latch assembly 120 are provided. The button assembly 110 includes a pressing member and a pressing latch 116 located below the pressing member. In this embodiment, the pressing member includes a pressing face shell 111 and a pressing bottom shell 112 assembled vertically. The pressing latch 116, also known as a latch, is a mature existing technology that can be directly purchased on the market. The pressing latch has self-locking and spring-opening functions. Due to its easy installation, it has long been widely used in various industries. When in use, after pressing, the pressing latch can be stably held in a certain position, and pressing again can quickly return it to its original state, easily controlling different strokes.
[0024] The locking assembly 120 includes a locking tongue 121; The socket body 100 is recessed with a recessed slot 101 and a button slot 104. The recessed slot 101 and the button slot 104 are arranged at intervals on the top of the socket body 100. The bottom surface of the recessed slot 101 is provided with a plurality of pin holes 102. Corresponding conductive components are provided in the pin holes 102. The inner peripheral side of the recessed slot 101 is recessed with a latch groove 103. The latch groove 103 connects the button slot 105 and the recessed slot 101. In the unlocked state, the pressing member is pressed to spring upward to a first height, the pressing latch 116 remains in the first locking position to be supported under the pressing member, and the latch 121 is hidden in the latch groove 103. In the locked state, the pressing member is pressed down to the second height, the pressing latch 116 remains in the second locking position to support it below the pressing member, and the locking tongue 121 extends out of the locking tongue slot 103 to protrude into the recessed slot 101.
[0025] A plug and socket assembly includes a socket and a plug. The socket is the aforementioned socket for preventing the plug from coming loose. The plug includes a plug body 200 and a plug cable. The plug body 200 includes a housing and a plurality of prongs 201 extending out of the housing. The housing is recessed with a locking groove 202 on its periphery. The plug body 200 is inserted into the recessed slot 101, and the pin 201 is inserted into the pin hole 102. When the pressing member is pressed down to the second height, the locking tongue 121 protrudes into the locking groove 202, and the plug body 200 cannot be pulled out. When the pressing member is pressed to spring upward to a first height, the locking tongue 121 retracts from the locking groove 202 and is hidden in the locking tongue inlet groove 103, releasing the locking of the plug body 200, and the plug body 200 can be pulled out.
[0026] In this embodiment, the pressing surface shell 111 of the pressing member has a first inclined push surface 117 facing downward; the locking assembly 120 includes a locking tongue seat 122 and a locking tongue seat retraction elastic member 124; one side of the locking tongue seat 122 has a second inclined push surface 125 facing the pressing member, the second inclined push surface 125 is located below the first inclined push surface 117 and the two slide in relative contact; the locking tongue 121 is disposed on the side of the locking tongue seat 122 opposite to the second inclined push surface 125, and the locking tongue seat retraction elastic member 124 acts between the locking tongue seat 122 and the socket body 100 to provide a restoring force for the locking tongue seat 122 to move towards the pressing member. The locking assembly 120 also includes a latch retraction elastic element 123, which acts between the latch 121 and the latch seat 122 to provide a restoring force for the latch 121 to move away from the second inclined push surface 125. The side of the latch 121 away from the second inclined push surface is provided with an guide slope or guide arc surface. In this way, when the socket is in the locked state (latch 121 is extended), the plug can still be inserted. This is because when the plug is pressed down on the guide slope or guide arc surface of the latch 121, the latch 121 will retract towards the second inclined push surface. When the plug is inserted into place, the latch 121 is reset under the action of the latch retraction elastic element 123 and is locked into the locking groove 202 on the plug body 200 to lock the plug and prevent the plug from being pulled out.
[0027] The latch seat 122 is provided with a latch mounting cavity 1220. A first guide and limiting groove 1221 is provided through the end wall of the latch mounting cavity 1220 opposite to the second inclined push surface 125. The latch 121 has a tongue portion 1211 extending from the side opposite to the second inclined push surface 125, and the tongue portion 1211 extends out from the first guide and limiting groove 1221. A second guide and limiting groove 1223 is also provided through the end wall of the latch mounting cavity 1220 opposite to the second inclined push surface 125. The second guide and limiting groove 1223 is located below the first guide and limiting groove 1221. The bottom of the latch 121 has a forward guiding block 1213, and the forward guiding block 1213 extends into the second guide and limiting groove 1223. The two side walls of the latch mounting cavity 1220 are respectively provided with third guide limiting grooves 1222. The two sides of the latch 121 are respectively provided with lateral guide blocks 1212, which extend into the third guide limiting grooves 1222. The latch retraction elastic element 123 and the latch seat retraction elastic element 124 are both compression springs, and there are two of each. The two latch retraction elastic elements 123 are provided on both sides of the latch portion 1211, and the two latch seat retraction elastic elements 124 are provided on both sides of the outer side of the latch mounting cavity 1220. The force is balanced and the stability is good.
[0028] Furthermore, an electronic switch 130 is also provided inside the socket body 100. The electronic switch 130 is located below the pressing member and beside the pressing latch 116. When the pressing member is pressed down to a second height, the pressing member simultaneously presses down to trigger the electronic switch 130. The electronic switch 130 is associated with the circuit switching of the conductive element in the plug hole 102, thus cleverly linking the plug power supply with the latch synchronously; and / or: the socket body 100 or the pressing member is provided with an indicator light, such as an LED light 113. The electronic switch 130 is associated with the on / off state of the indicator light. Using an indicator light helps prevent users from forgetting to operate the pressing member. For power strips, users will press the pressing member, and the indicator light will light up, which is the common practice of most users. Preferably, the user presses the pressing element, which triggers the electronic switch 130 at the same time as locking. Since the electronic switch 130 is associated with the circuit opening and closing of the conductive element in the pin hole 102 and the opening and closing of the indicator light, the circuit is connected and the indicator light is lit at the same time as locking.
[0029] The socket body 100 also includes a support plate 140 and a circuit board 150. The electronic switch 130 is mounted on the circuit board 150. The upper end of the support plate 140 is screwed to the upper shell 12 of the socket body 100, and the lower end of the support plate 140 is screwed to the circuit board 150. The latch assembly 120 is supported on the top of the support plate 140 and can slide relative to the top surface of the support plate 140. Multiple semi-cylindrical ribs spaced apart can be provided at the bottom of the latch seat 122. The downward-facing arc-shaped protrusions of these ribs reduce the contact area, lower friction, and improve the smoothness of sliding.
[0030] As mentioned above, the pressing component includes a pressing face shell 111 and a pressing bottom shell 112 assembled from upper and lower parts. The pressing component is designed as a multi-piece structure that is manufactured separately and then reassembled, mainly to take into account the installation of the LED light 113. The pressing face shell 111 and the pressing bottom shell 112 form a space for the installation of the LED light 113. A light outlet is reserved at the top of the pressing face shell 111. The pressing bottom shell 112 can be made of a light-transmitting material. During assembly, its top protrusion 118 is embedded into the light outlet. A wire hole 114 is reserved on the main body plate of the pressing bottom shell 112. The LED light 113 is installed on the main body plate, and the circuit board 140 wires pass through the wire hole 114 to connect to the LED light 113. The bottom of the pressing base 112 is formed with an action part 115 for matching the pressing latch 116. Multiple connecting protrusions are provided on the pressing base 112, and a first connecting hole is provided in the protrusion. Correspondingly, a second connecting hole is provided on the pressing surface 111, and a screw extends from the first connecting hole into the second connecting hole.
[0031] The plug is primarily used for power extraction; for example, the other end of the plug cable is connected to a car charging gun for charging a car. Two signal terminals 105 protrude from the recessed slot 101 of the socket body 100. These are both flexible terminals and are connected to the circuit board 150. Corresponding signal terminal connection ends are provided on the plug body 200, which are contact portions that do not protrude from the plug end face. The socket has three pin holes 102, thus, together with the two signal terminals, fulfilling the five-core wire functional definition of live (L), neutral (N), ground (PE), CP signal line, and PP signal line.
[0032] Furthermore, the button assembly 110 and the upper shell 12 of the socket body 100 are designed with a clever positioning structure: a positioning frame 106 is provided on the inner bottom surface of the upper shell 12, and two positioning protrusions 107 are provided at multiple positions on the inner side of the positioning frame 106. The area enclosed by the positioning frame 106 serves as the mounting cavity of the button assembly 110. Positioning grooves 119 are provided on the periphery of the pressing surface shell 111 and the pressing bottom shell 112 of the button assembly 110, and the positioning protrusions 107 are engaged with the corresponding positioning grooves. Inside 119, a button groove 104 is formed on the upper shell 12. The inner bottom surface of the upper shell 12 is provided with a reinforcing protrusion, such as a C-shaped reinforcing protrusion, around the button groove 104. It surrounds the outer periphery of the button groove and is located in the area enclosed by the positioning frame 106. It is connected to the positioning frame 106 by connecting ribs to form an integral part, thereby improving the structural strength. Furthermore, the setting of the reinforcing protrusion increases the groove wall depth of the button groove 104 in the vertical direction, which is beneficial for guiding and positioning the upper and lower strokes of the pressing part.
[0033] Because the socket body 100 adopts a recessed slot 101 design, a portion of the outer shell of the plug body 200 is concealed within the recessed slot 101, which helps to improve the bonding strength between the plug body 200 and the socket body 100, and prevents external dust and dirt from entering. Furthermore, the outer shell can be designed as an embedded part and an exposed part. The embedded part fits into the recessed slot 101, while the lower periphery of the exposed part extends beyond the outer periphery of the embedded part to form a shielding annular edge. When the plug body 200 is inserted into the socket body 100, the shielding annular edge covers the joint between the embedded part and the recessed slot 101 (there may be a small gap), enhancing the ability to prevent dust and water from entering and improving safety.
[0034] The key design feature of this utility model lies in its improvement of the socket structure to achieve a locking mechanism for the plug, preventing it from being improperly pulled out. In particular, its ingenious and reasonable structure does not occupy the original socket's insertion end area or affect the original socket's component layout. It only requires a locking groove recessed around the periphery of the original plug's outer shell, without altering the original plug structure. For the original plug, the only change is adding a locking groove during the injection molding of the outer shell, essentially requiring only minor modifications to the injection mold. This does not significantly increase the plug's cost. The plug with the added locking groove is also compatible with other sockets without a locking function. Therefore, this technical solution is suitable for widespread application.
[0035] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.
Claims
1. A socket for preventing plug from coming loose, comprising a socket body, characterized in that: The socket body is provided with a button assembly and a latch assembly; the button assembly includes a pressing member and a pressing latch located below the pressing member, and the latch assembly includes a locking tongue; The socket body is recessed with a recessed slot and a button slot. The bottom surface of the recessed slot is provided with multiple pin holes, and corresponding conductive parts are provided in the pin holes. The inner circumferential side of the recessed slot is recessed with a locking tongue groove. In the unlocked state, the pressing member is pressed to spring upward to a first height, the pressing latch remains in a first locking position to be supported under the pressing member, and the bolt is hidden in the bolt slot; In the locked state, the pressing member is pressed down to the second height, the pressing latch remains in the second locking position to support it below the pressing member, and the locking tongue extends out of the locking tongue slot to protrude into the recessed slot.
2. The socket for preventing plug loosening according to claim 1, characterized in that: The pressing component has a downward-facing first inclined push surface; The latch assembly includes a latch seat and a latch seat retraction elastic member; one side of the latch seat has a second inclined push surface facing the pressing member, the second inclined push surface is located below the first inclined push surface and the two slide in contact with each other; the latch is disposed on the side of the latch seat opposite to the second inclined push surface, and the latch seat retraction elastic member acts between the latch seat and the socket body to provide a restoring force for the latch seat to translate toward the pressing member.
3. The socket for preventing plug loosening according to claim 2, characterized in that: The latch assembly also includes a latch retraction elastic element, which acts between the latch and the latch seat to provide a restoring force for the latch to move away from the second inclined push surface. The side of the latch away from the second inclined push surface is provided with a guide slope or a guide arc surface.
4. The socket for preventing plug loosening according to claim 3, characterized in that: The latch seat is provided with a latch mounting cavity. A first guide and limiting groove is provided through the end wall of the latch mounting cavity opposite to the second inclined push surface. The latch has a tongue portion extending from the side opposite to the second inclined push surface. The tongue portion extends out from the first guide and limiting groove.
5. The socket for preventing plug loosening according to claim 4, characterized in that: A second guide limiting groove is also provided through the end wall of the latch mounting cavity opposite to the second inclined push surface. The second guide limiting groove is located below the first guide limiting groove. The bottom of the latch has a forward guiding block, which extends into the second guide limiting groove.
6. The socket for preventing plug loosening according to claim 4, characterized in that: The two side walls of the latch mounting cavity are respectively provided with a third guide limiting groove, and the two sides of the latch are respectively provided with a lateral guide block, which extends into the third guide limiting groove.
7. The socket for preventing plug loosening according to any one of claims 1 to 6, characterized in that: The socket body is also provided with an electronic switch, which is located below the pressing member; when the pressing member is pressed down to a second height, the pressing member simultaneously presses down to trigger the electronic switch.
8. The socket for preventing plug loosening according to claim 7, characterized in that: The electronic switch is associated with the on / off state of the circuit of the conductive component inside the pin hole; And / or: An indicator light is provided on the socket body or the pressing component, and the electronic switch is associated with the on / off state of the indicator light.
9. The socket for preventing plug loosening according to claim 7, characterized in that: The socket body is also provided with a support plate and a circuit board. The electronic switch is disposed on the circuit board. The upper end of the support plate is connected to the upper shell of the socket body, and the lower end of the support plate is connected to the circuit board. The locking assembly is supported on the top of the support plate and can slide and move relative to the top surface of the support plate.
10. A plug and socket assembly, comprising a socket and a plug, characterized in that: The socket is a socket for preventing plug loosening as described in any one of claims 1 to 9, the plug including a plug body, the plug body including a housing and a plurality of prongs extending out of the housing, and the housing having a locking groove recessed on its periphery; The plug body is inserted into the recessed slot, and the pins are inserted into the pin holes. When the pressing member is pressed down to the second height, the locking tongue protrudes into the locking groove, and the plug body cannot be pulled out. When the pressing member is pressed to spring upward to a first height, the locking tongue retracts from the locking groove and is hidden in the locking tongue inlet groove, releasing the locking of the plug body, and the plug body can be pulled out.