Plug

Abstract

The utility model provides a plug which comprises a shell, a cavity is formed in the shell, and a plug pin assembly is arranged in the cavity. The plug pin assembly comprises a plug pin and a first support which are integrally formed in an injection mode, the first support wraps part of the plug pin after being integrally formed in an injection mode, the plug pin comprises a plugging arm used for being connected with a socket in a plugging mode, the shell is provided with a first through hole, and the plugging arm extends out of the shell through the first through hole. The first support comprises a clamping part and a sheath part which are integrally formed through injection molding, the clamping part and the shell are clamped and fixed in the cavity, the clamping part shields the first through hole and wraps part of the plug pin, and the sheath part extends out of the shell through the first through hole; the sheath part wraps the part, which extends out of the shell and is close to the first bracket, of the plugging arm; due to the fact that the bolt integrated forming technology is adopted and the insulating layer is arranged on the bolt, the insulating layer can effectively prevent electric shock under the condition that part of the bolt is exposed, and the electricity utilization safety can be effectively protected.

Description

Technical Field

[0001] This utility model relates to the field of electrical accessories, specifically to a plug. Background Technology

[0002] With increasing demands for electrical safety and new national standards imposing new requirements on the safety levels of electrical accessories, the safety performance of electrical accessories is being comprehensively improved. Currently, most detachable plugs on the market use separate pins, and neither the exposed part of the pin nor the mating surface is insulated. If the plug is not fully inserted into the socket, there is a risk of electric shock. Furthermore, the individual assembly of the pins can cause them to wobble, resulting in unstable center distances or misalignment, leading to a less smooth plug insertion and a poor user experience. Summary of the Invention

[0003] The purpose of this utility model is to overcome at least one defect of the prior art and provide a plug that ensures electrical safety when the pin part is exposed.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A plug includes a housing with a cavity inside, and a pin assembly disposed within the cavity; the pin assembly includes an integrally injection-molded pin and a first bracket, the first bracket being integrally injection-molded to enclose a portion of the pin, the pin including a plug arm for engaging with a socket, the housing having a first through hole, and the plug arm extending out of the housing through the first through hole.

[0006] The first bracket includes an integrally injection-molded engaging part and a protective sleeve part. The engaging part is engaged and fixed to the outer shell in the cavity. The engaging part blocks the first through hole and wraps around part of the pin. The protective sleeve part extends out of the outer shell through the first through hole and wraps around the part of the plug-in arm that extends out of the outer shell and is close to the first bracket.

[0007] Furthermore, the portion of the plug-in arm extending out of the outer casing is provided with a first groove around the peripheral wall, and the sheath portion covers the first groove.

[0008] Furthermore, the sheath portion is integrally formed with a support portion and an insulating portion. The support portion is used to connect the insulating portion and the engaging portion. The support portion is disposed in the first through hole, and the insulating portion extends out of the outer shell and is used to wrap the plug-in arm.

[0009] Furthermore, the length h of the insulating portion extending from the support portion is 7.2 to 7.4 mm, and the distance H between the end of the insulating portion away from the first bracket and the engaging portion is 9 to 10 mm.

[0010] Furthermore, the cavity is provided with a locking assembly that engages with the locking part. The locking assembly includes a first limiting plate and a second limiting plate spaced apart. A first cavity is provided between the first limiting plate and the second limiting plate. The first limiting plate is provided with a first through hole, and the second limiting plate is provided with a second through hole. The locking part of the pin assembly is fixedly installed in the first cavity. A wiring terminal is provided in the outer shell cavity. One end of the pin extends out of the first through hole, and the other end of the pin extends out of the second through hole and connects to the wiring terminal.

[0011] Furthermore, the engaging part has a plate-like structure, with at least two sheath portions protruding on one side of the engaging part, a support portion between the engaging part and the sheath portions, and a limiting portion protruding on the other side of the engaging part. The insertion and extraction arm of one end of the pin extends from the support portion and the sheath portion, and the other end of the pin extends from the limiting portion. The engaging part is placed in the first cavity, the support portion is placed in the first through hole, and the limiting portion is placed in the second through hole for engagement and fixation.

[0012] Furthermore, the pin is integrally formed with a plug-in arm, which extends through the first through hole and connects to an external socket; a main connecting arm is connected to the plug-in arm; a support arm is connected to the main connecting arm, which extends through the second through hole and connects to the terminal block; and a limiting arm is connected to the support arm for engaging with the terminal block.

[0013] Furthermore, the plug-in arm is folded perpendicularly to the main connecting arm, the main connecting arm is folded perpendicularly to the support arm, and the extended line of the support arm's cross section intersects the plug-in arm. The support arm is also perpendicularly positioned to the limiting arm.

[0014] Furthermore, the pin structure unfolds into a plane, and the unfolded plane of the pin is L-shaped. The plug arm and the support arm are two mutually perpendicular sides of the L-shape, and there is a cutting seam between the plug arm, the support arm, and the main connecting arm.

[0015] Furthermore, the outer shell includes a bottom shell and a top shell, with a cavity between the bottom shell and the top shell. A second support is disposed within the cavity, and a second cavity is disposed within the second support, with a wiring terminal disposed within the second cavity.

[0016] Furthermore, a positioning boss is provided inside the second bracket, and the positioning boss is provided with a positioning hole. The bottom shell is provided with a positioning post that mates with the positioning hole. The positioning hole of the second bracket is inserted into the positioning post of the bottom shell, and the positioning post limits the positioning hole.

[0017] Furthermore, the top surface of the second bracket is provided with an operating hole, and the terminal block is provided with a fastener. The operating hole is used for inserting a tool to tighten the fastener.

[0018] Furthermore, the second bracket has a first notch on the side away from the first bracket for an external wire to pass through and connect to the terminal block; the second bracket has a second notch on the side facing the first bracket for the support arm of the pin to pass through and connect to the terminal block. After the external wire and the support arm are inserted into the terminal block, the second bracket covers the support arm of the pin, the terminal block, and the terminal of the external wire.

[0019] Furthermore, the first notch is provided with a first protruding edge, which is a protrusion extending along the edge of the first notch; the second notch is provided with a second protruding edge, which is a protrusion extending along the edge of the second notch.

[0020] Furthermore, the fastener is configured as a screw, the screw is provided with a nut, the nut is provided with an annular baffle, the diameter of the annular baffle is larger than the diameter of the operating hole, in order to prevent the screw from coming out of the operating hole.

[0021] This utility model adopts a one-piece molding technology for the plug. The sheath extends out of the outer shell through the first through hole, and the sheath covers the part of the plug arm that extends out of the outer shell and is close to the first bracket. In the event that the plug is not fully inserted into the socket or the plug is loose and the plug is exposed, the sheath can effectively prevent electric shock and effectively protect electrical safety. Moreover, there is no gap between the plug and the first bracket, which avoids dust or electric shock.

[0022] In addition, the pin of this utility model adopts a matching structure of a second bracket and a terminal block, thereby providing protection for the support arm of the pin, the terminal block and the wiring end of the external wires by the second bracket, and improving insulation.

[0023] In addition, the pin of this utility model adopts a structure in which the pin assembly is engaged with the outer shell, so that the pin insertion and removal process remains stable and the pin will not be tilted.

[0024] In addition, the pin of this utility model adopts a folding structure, which can effectively save materials and reduce costs. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the plug provided by this utility model;

[0026] Figure 2 This is an exploded view of the plug provided by this utility model;

[0027] Figure 3 This is an exploded view of the plug assembly provided by this utility model;

[0028] Figure 4This is a schematic diagram of the structure of the latch provided by this utility model;

[0029] Figure 5 This utility model provides a schematic diagram of the length of the insulating part of the pin.

[0030] Figure 6 This is a schematic diagram of the various structural angles of the latch provided by this utility model;

[0031] Figure 7 This is a schematic diagram of the unfolded surface of the pin provided by this utility model;

[0032] Figure 8 This is a front view of the second bracket provided by this utility model;

[0033] Figure 9 This is a rear view of the second bracket provided by this utility model;

[0034] Figure 10 This is a bottom view of the second support provided by this utility model;

[0035] Figure 11 This is an assembly diagram of the plug provided by this utility model.

[0036] The reference numerals in the attached figures include:

[0037] Plug 1; Outer shell 2; Bottom shell 21; First limiting plate 211; First through hole 2111; Second limiting plate 212; Second through hole 2121; First cavity 213; Positioning post 214; Protruding rib 2141; First connecting hole 2142; Threaded seat 22; First connecting post 23; Face shell 24; Engaging assembly 25; Through hole assembly 26;

[0038] Pin assembly 3; Pin 31; Insertion / removal arm 311; First groove 3111; First step 3112; First step 3113; Main connecting arm 312; Support arm 313; Limiting arm 314; Cutting slit 317; First bracket 32; Sheath part 321; Support part 3211; Insulating part 3212; Limiting part 322; Engaging part 323;

[0039] Second bracket 4; positioning boss 41; positioning hole 411; isolation rib 412; second cavity 42; operating hole 43; first notch 44; first protruding edge 441; second notch 45; second protruding edge 451;

[0040] Terminal block 5; Fastener 51; Nut 511; Annular baffle 5111; Protective part 52;

[0041] Wire clamp 6. Detailed Implementation

[0042] The specific embodiments of this utility model are further described below with reference to the accompanying drawings. The scope of protection of this utility model is not limited to the description of the following embodiments.

[0043] like Figure 1 , 2 As shown, this embodiment provides a plug, including a housing 2, with a cavity inside the housing 2, and a pin assembly 3 disposed inside the cavity; the pin assembly 3 includes an integrally injection-molded pin 31 and a first bracket 32, the first bracket 32 ​​being integrally injection-molded to cover part of the pin 31, the pin 31 including a plug-in arm 311 for plugging into a socket, the housing 2 having a first through hole 2111, and the plug-in arm 311 extending out of the housing 2 through the first through hole 2111;

[0044] The first bracket 32 ​​includes an integrally injection-molded engaging portion 323 and a sheath portion 321. The engaging portion 323 is engaged and fixed to the outer shell 2 in the cavity. The engaging portion 323 blocks the first through hole 2111 and wraps around part of the pin 31. The sheath portion 321 extends out of the outer shell 2 through the first through hole 2111 and wraps around the portion of the insertion arm 311 that extends out of the outer shell 2 and is close to the first bracket 32.

[0045] This utility model adopts the one-piece molding technology of the plug 31, and a protective sleeve is provided on the plug 31 as an insulating layer. The protective sleeve 321 extends out of the outer shell 2 through the first through hole 2111, and the protective sleeve 321 covers the part of the plug arm 311 that extends out of the outer shell 2 and is close to the first bracket 32. In the case that the plug 1 is not fully inserted into the socket or the plug 1 is loose and the plug 31 is partially exposed, the insulating layer can effectively prevent electric shock and effectively protect electrical safety. Moreover, there is no gap between the plug 31 and the first bracket 32, which avoids dust or electric shock.

[0046] Preferably, the portion of the plug-in arm 311 extending out of the outer casing 2 is provided with a first groove 3111 around the peripheral wall, and the sheath portion 321 wraps around the first groove 3111.

[0047] The outer shell 2 has a locking assembly 25 within its cavity for engaging and fixing with the locking part 323. The locking assembly 25 includes a through-hole assembly 26 with a first through-hole 2111. Specifically, the locking assembly 25 includes a first limiting plate 211 and a second limiting plate 212 spaced apart, with a first cavity 213 between the first limiting plate 211 and the second limiting plate 212. The locking part 323 of the pin assembly 3 engages with the first cavity 213. The through-hole assembly 26 includes a first through-hole 2111 and a second through-hole 2121, with the first through-hole 2111 and the second through-hole 2121 opposite to each other. The first limiting plate 211 has the first through-hole 2111, and the second limiting plate 212 has the second through-hole 2121. A terminal block 5 is provided within the cavity of the outer shell 2. One end of the pin 31 extends out of the first through-hole 2111, and the other end extends out of the second through-hole 2121 to connect with the terminal block 5.

[0048] like Figure 2 As shown, the plug housing 2 of this embodiment includes a bottom shell 21 and a top shell 24, with a cavity between the bottom shell 21 and the top shell 24. A pin assembly 3, a second bracket 4, a terminal block 5, and a wire clamp 6 are disposed within the cavity. One end of the pin 31 of the pin assembly 3 is connected to the terminal block 5, and the other end has a plug / pull arm 311 extending from the housing 2. The second bracket 4 contains a second cavity 42, within which the terminal block 5 is disposed. The second bracket 4 covers the terminal block 5, providing insulation protection. A wire hole is provided at the end of the housing 2 away from the pin 31 for connecting an external wire to the terminal block 5 after insertion. The wire clamp 6 is used to clamp the wire to prevent movement. Obviously, as a degraded embodiment, the wire clamp 6 may be omitted, and / or the second bracket 4 and terminal block 5 may be omitted, with the external wire directly connected to the pin 31.

[0049] like Figure 3 As shown, in a preferred embodiment of the pin assembly 3, the pin assembly 3 is engaged with the engaging assembly 25. The pin assembly 3 includes a pin 31 and a first bracket 32 ​​integrally injection molded with the pin 31. The first bracket 32 ​​is engaged with the engaging assembly 25. The pin 31 is preferably made of copper, has a rectangular cross-section, and is specifically a sheet material. One end of the pin 31 is connected to an external socket hole, and the other end is connected to a terminal block 5.

[0050] like Figures 3 to 7As shown, in a preferred embodiment of the pin 31, the pin 31 is integrally formed with a plug-in arm 311, which extends through the first through hole 2111 and connects to an external socket; a main connecting arm 312 is connected to the plug-in arm 311; a support arm 313 is connected to the main connecting arm 312, which extends through the second through hole 2121 and connects to the terminal block 5; and a limiting arm 314 is connected to the support arm 313 for engaging with the terminal block 5.

[0051] like Figure 6 As shown, the insertion arm 311 is folded perpendicularly to the main connecting arm 312, the main connecting arm 312 is folded perpendicularly to the support arm 313, and the extended line of the cross section of the support arm 313 intersects the insertion arm 311. The support arm 313 is perpendicularly arranged to the limiting arm 314. The pin 31 structure unfolds into a plane, and the unfolded plane of the pin 31 is L-shaped. The insertion arm 311 and the support arm 313 are two mutually perpendicular sides of the L-shape. There is a cutting seam 317 between the insertion arm, the support arm, and the main connecting arm for cutting the sheet metal. The sheet metal is cut according to the shape of the unfolded diagram of the pin 31. Only a small amount of sheet metal at the cutting seam 317 needs to be discarded. Then, the sheet metal is folded perpendicularly twice as described above to form the pin 31 of this embodiment. Since the pin 31 of this embodiment adopts a folding structure, it can effectively save materials and reduce costs.

[0052] like Figure 5 As shown, preferably, two pins 31 are symmetrically arranged, namely a neutral pin and a live pin, which are wrapped and fixed by the first bracket 32 ​​to ensure accurate center distance between the plug pins 31. Of course, two pins 31 can be provided for plugging and unplugging two-hole sockets, or three pins 31 can be provided, namely a live pin, a neutral pin, and a ground pin, for plugging and unplugging three-hole sockets. It can also be a multi-functional pin, with one set of two pins 31 and another set of three pins 31, etc., to provide customers with more options.

[0053] Preferred, such as Figure 3 As shown, the upper part of the insertion arm 311 near the support arm 313 is provided with a stepped first step 3112 and a first step 3113. The first step 3113 protrudes the limiting part 322, which limits the first step 3112, thereby restricting the displacement of the pin 31 under force during insertion into the insertion hole and enhancing the stability of the pin 31.

[0054] Preferably, the end of the plug-in arm 311 away from the first bracket 32 ​​is provided with a plug-in end face, which is an arc-shaped end face, so as to facilitate the plug 1 to be inserted into the socket hole and reduce resistance.

[0055] like Figure 2 , 3 As shown, the first bracket 32 ​​is preferably made of plastic. The first bracket 32 ​​is snapped into the first cavity 213. The first bracket 32 ​​and the pin 31 are integrally injection molded and enclose the pin 31.

[0056] The first bracket 32 ​​includes an integrally injection-molded engaging portion 323 and a sheath portion 321. The engaging portion 323 is engaged with the engaging assembly 25, and the sheath portion 321 covers the portion of the insertion arm 311 that extends out of the outer shell 2.

[0057] Furthermore, the sheath portion 321 is integrally formed with a support portion 3211 and an insulating portion 3212. The support portion 3211 is used to connect the insulating portion 3212 and the engaging portion 323. The support portion 3211 is disposed in the first through hole 2111. The insulating portion 3212 extends out of the outer shell 2 and is used to wrap the plug arm 311. In this embodiment, the insulating portion 3212 integrally injection molded on the pin 31 is used as the insulating layer. In the event that the plug 1 is not fully inserted into the socket or the plug 1 is loose and the pin 31 is partially exposed, the insulating layer can effectively prevent electric shock and effectively protect electrical safety.

[0058] Preferably, the engaging part 323 has a plate-like structure. At least two sheath parts 321 protrude from one side of the engaging part 323. A support part 3211 is provided between the engaging part 323 and the sheath parts 321. A limiting part 322 protrudes from the other side of the engaging part 323. The insertion and extraction arm 311 at one end of the pin 31 extends from the support part 3211 and the sheath part 321. The other end of the pin 31 extends from the limiting part 322. The engaging part 323 is placed in the first cavity 213, the support part 3211 is placed in the first through hole 2111, and the limiting part 322 is placed in the second through hole 2121 for locking and fixing.

[0059] Preferably, the length h of the insulating part 3212 extending from the support part 3211 is 7.2 to 7.4 mm, and the distance H between the end of the insulating part 3212 away from the first bracket 32 ​​and the engaging part 323 is 9 to 10 mm. This ensures that the pin 31 is energized while preventing accidental electric shock by isolating the exposed portion of the pin 31 when the plug 1 is not fully inserted into the socket. Of course, the above length range can be adjusted according to the length of the pin 31, and the outer wall of the pin 31 can be insulated.

[0060] Preferably, the outer wall of the first groove 3111 is provided with a uniformly arranged diamond pattern to increase the plastic coating ability of the pin 31 and prevent the plastic from falling off and deforming.

[0061] The engaging part 323 has a square cross-section and its shape is configured to fit the second cavity 42. The engaging part 323 is used to engage the second cavity 42 and to block the first through hole 2111 to prevent the pin from shaking during insertion into the socket.

[0062] Preferably, the limiting part 322 and the supporting part 3211 are symmetrically arranged relative to the engaging part 323.

[0063] like Figure 8 , 9 As shown in Figures 10 and 11, in a preferred embodiment of the second bracket 4, the top surface of the second bracket 4 is provided with an operating hole 43, and the terminal block 5 is provided with a fastener 51. The operating hole 43 is used for inserting a tool to tighten the fastener 51. The side of the second bracket 4 away from the first bracket 32 ​​is provided with a first notch 44, preferably a square notch, and symmetrically arranged, for external wires to pass through and connect to the terminal block 5. The side of the second bracket 4 facing the first bracket 32 ​​is provided with a second notch 45, preferably a U-shaped notch, and symmetrically arranged, for the support arm 313 of the pin 31 to pass through and connect to the terminal block 5. After the external wire and the support arm 313 are inserted into the terminal block 5, the second bracket covers the support arm 313 of the pin, the terminal block 5, and the terminal of the external wire, thereby providing protection for the above components, so that the conductive components inside the housing 2 are covered by the second bracket 4, improving insulation. Figure 11 As shown, the side of the second bracket 4 with the second notch 45 contacts the limiting part 322, so that all the conductive elements in the cavity are covered.

[0064] Preferably, the first notch 44 is provided with a first protruding edge 441, which is a protrusion extending along the edge of the first notch 44; the second notch 45 is provided with a second protruding edge 451, which is a protrusion extending along the edge of the second notch 45, making it easier for the socket to insert the wiring terminal 5.

[0065] Preferably, the second bracket 4 has a second cavity 42 symmetrically arranged inside, and a wiring terminal 5 is arranged in the second cavity 42. A positioning boss 41 is arranged between the wiring terminals 5. An isolation rib 412 is arranged on the outer wall surface of the positioning boss 41 facing the first bracket 32. The isolation rib 412 extends longitudinally along the outer wall surface of the positioning boss 41 and extends laterally to the outer edge of the second protrusion 451 of the second notch 45. The isolation rib 412 is used to space between the pins 31 to avoid electric sparks between the pins 31 during the insertion and removal of the plug 1.

[0066] Preferably, the outer edge of the operating hole 43 is chamfered, and the chamfer cross-section is C-shaped, which facilitates the guidance of external tools to extend into the second bracket 4 and fasten the wiring terminal 5.

[0067] Preferably, the positioning hole 411 of the boss is a closed U-shaped positioning hole 411, and the positioning post 214 of the bottom shell 21 is provided with a protruding rib 2141. The protruding rib 2141 is arranged longitudinally along the positioning post 214 and has an inclined surface. The positioning post 214 and the protruding rib 2141 limit the U-shaped positioning hole 411, so that the second bracket 4 can stably protect the wiring terminal 5 and prevent the wiring from being unstable.

[0068] like Figure 2 As shown, there are two symmetrically arranged terminals 5 with a square cross-section. Each terminal 5 has a hollow structure for inserting and fixing external wires and the support arm 313 of the pin 31.

[0069] The terminal block 5 is provided with a fastener 51. A pair of screw holes are provided on the side of the terminal block 5 away from the bottom housing 21. A protective portion 52 is provided on the edge of the terminal block 5 near the bottom housing 21. The support arm 313 of the external wire and the pin 31 is inserted into the hollow structure of the terminal block 5. Tightening the fastener 51 fixes the support arm 313 of the external wire and the pin 31 within the terminal block 5.

[0070] Preferably, after the support arm 313 of the pin 31 passes through the hollow structure of the terminal 5, the limiting arm 314 of the pin 31 engages with the upper edge of the hollow structure away from the bottom shell 21.

[0071] Preferably, the fastener 51 is a screw with a nut 511 and an annular baffle 5111. The diameter of the annular baffle 5111 is larger than the diameter of the operating hole 43 of the second bracket 4 described below, so as to prevent the screw from coming out of the operating hole 43.

[0072] The protective part 52 is a protrusion extending from the end of the terminal 5 facing the bottom shell 21 to the bottom shell 21. It is used to apply force when the fastener 51 is tightened so that the terminal 5 is separated from the bottom shell 21 by a certain gap, so as to avoid excessive deformation of the pin 31 or the external wire, which would cause damage to the pin 31 and the external wire.

[0073] like Figure 2As shown, in a preferred embodiment of the wire clamp 6, the wire clamp 6 is provided with threaded holes, preferably two threaded holes arranged symmetrically. The bottom shell 21 is provided with a threaded seat 22 corresponding to the threaded holes. The wire clamp 6 is threadedly connected to the bottom shell 21. A gap is provided between the wire clamp 6 and the bottom shell 21. The external wire passes through the gap between the wire clamp 6 and the bottom shell 21 and is connected to the terminal block 5.

[0074] like Figure 2 As shown, the bottom shell 21 and the top shell 24 are fixedly connected, which can be by clips or screws. In this embodiment, a first connecting post 23 is provided through the middle of the bottom shell 21, and the first connecting post 23 is provided with a first connecting hole 2142; the top shell 24 is provided with a second connecting post facing the bottom shell 21, and the second connecting post is provided corresponding to the first connecting post 23. The second connecting post is provided with a second connecting hole, and the second connecting hole is provided corresponding to the first connecting hole 2142. The bottom shell 21 and the top shell 24 are threadedly connected through the first connecting hole 2142 and the second connecting hole.

[0075] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used during use. They are only for ease of description and do not indicate that the device or component referred to must have a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating relative importance.

[0076] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A plug, comprising a housing (2), wherein a cavity is provided within the housing (2), and a pin assembly (3) is disposed within the cavity; characterized in that: The pin assembly (3) includes an integrally injection-molded pin (31) and a first bracket (32). The first bracket (32) is integrally injection-molded and then wraps around part of the pin (31). The pin (31) includes a plug-in arm (311) for plugging into a socket. The housing (2) is provided with a first through hole (2111). The plug-in arm (311) extends out of the housing (2) through the first through hole (2111). The first bracket (32) includes an integrally injection-molded engaging part (323) and a sheath part (321). The engaging part (323) is engaged and fixed to the outer shell (2) in the cavity. The engaging part (323) blocks the first through hole (2111) and wraps part of the pin (31). The sheath part (321) extends out of the outer shell (2) through the first through hole (2111) and wraps the part of the plug-in arm (311) that extends out of the outer shell (2) and is close to the first bracket (32).

2. The plug according to claim 1, characterized in that: The portion of the plug-in arm (311) extending out of the outer casing (2) is provided with a first groove (3111) around the peripheral wall, and the sheath portion (321) wraps around the first groove (3111).

3. The plug according to claim 2, characterized in that: The sheath (321) is integrally formed with a support (3211) and an insulating part (3212). The support (3211) is used to connect the insulating part (3212) and the engaging part (323). The support (3211) is disposed in the first through hole (2111). The insulating part (3212) extends out of the outer shell (2) and is used to wrap the plug-in arm (311).

4. The plug according to claim 3, characterized in that: The length h of the insulating part (3212) extending from the support part (3211) is 7.2 to 7.4 mm, and the distance H of the end of the insulating part (3212) away from the first bracket (32) from the engaging part (323) is 9 to 10 mm.

5. The plug according to claim 1, characterized in that: The cavity is provided with a locking assembly (25) that engages with the locking part (323). The locking assembly (25) includes a first limiting plate (211) and a second limiting plate (212) spaced apart. A first cavity (213) is provided between the first limiting plate (211) and the second limiting plate (212). The first limiting plate (211) is provided with a first through hole (2111), and the second limiting plate (212) is provided with a second through hole (2121). The locking part (323) of the pin assembly (3) is fixedly installed in the first cavity (213). A terminal block (5) is provided in the cavity of the outer shell (2). The insertion and removal arm (311) of one end of the pin (31) extends out of the first through hole (2111), and the other end of the pin (31) extends out of the second through hole (2121) and connects to the terminal block (5).

6. The plug according to claim 5, characterized in that: The engaging part (323) has a plate-like structure. At least two sheaths (321) protrude from one side of the engaging part (323). A support part (3211) is provided between the engaging part (323) and the sheaths (321). A limiting part (322) protrudes from the other side of the engaging part (323). The insertion and extraction arm (311) of one end of the pin (31) extends from the support part (3211) and the sheaths (321). The other end of the pin (31) extends from the limiting part (322). The engaging part (323) is placed in the first cavity (213), the support part (3211) is placed in the first through hole (2111), and the limiting part (322) is placed in the second through hole (2121) for locking and fixing.

7. The plug according to claim 5, characterized in that: The pin (31) is integrally formed with a plug-in arm (311), which extends through the first through hole (2111) and connects to the external plug hole; A main connecting arm (312) connected to the plug-in arm (311); a support arm (313) connected to the main connecting arm (312), the support arm (313) passing through the second through hole (2121) and connected to the terminal block (5); a limiting arm (314) connected to the support arm (313) for engaging with the terminal block (5).

8. The plug according to claim 7, characterized in that: The plug-in arm (311) is folded perpendicularly to the main connecting arm (312), the main connecting arm (312) is folded perpendicularly to the support arm (313), and the extended line of the cross section of the support arm (313) intersects the plug-in arm (311) in a cross shape. The support arm (313) is perpendicularly arranged to the limiting arm (314).

9. The plug according to claim 8, characterized in that: The pin (31) structure unfolds into a plane, and the unfolded plane of the pin (31) is L-shaped. The plug arm (311) and the support arm (313) are two mutually perpendicular sides of the L-shape. There is a cutting seam (317) between the plug arm (311), the support arm (313), and the main connecting arm (312).

10. The plug according to claim 1, characterized in that: The outer shell (2) includes a bottom shell (21) and a front shell (24), and there is a cavity between the bottom shell (21) and the front shell (24). A second support (4) is provided in the cavity, and a second cavity (42) is provided in the second support (4). A wiring terminal (5) is provided in the second cavity (42).

11. The plug according to claim 10, characterized in that: The second bracket (4) is provided with a positioning boss (41), the positioning boss (41) is provided with a positioning hole (411), the bottom shell (21) is provided with a positioning post (214) that cooperates with the positioning hole (411), the positioning hole (411) of the second bracket (4) is inserted into the positioning post (214) of the bottom shell (21), and the positioning post (214) limits the positioning hole (411).

12. The plug according to claim 10, characterized in that: The second bracket (4) has an operating hole (43) on its top surface, and the terminal block (5) has a fastener (51). The operating hole (43) is used for inserting a tool to tighten the fastener (51).

13. The plug according to claim 10, characterized in that: The second bracket (4) has a first notch (44) on the side away from the first bracket (32) for an external wire to pass through and connect to the terminal (5); the second bracket (4) has a second notch (45) on the side facing the first bracket (32) for the support arm (313) of the pin (31) to pass through and connect to the terminal (5). After the external wire and the support arm (313) are inserted into the terminal (5), the second bracket (4) covers the support arm (313) of the pin, the terminal (5) and the terminal of the external wire.

14. The plug according to claim 13, characterized in that: The first notch (44) is provided with a first protruding edge (441), which is a protrusion extending along the edge of the first notch (44); the second notch (45) is provided with a second protruding edge (451), which is a protrusion extending along the edge of the second notch (45).

15. The plug according to claim 12, characterized in that: The fastener (51) is configured as a screw, the screw is provided with a nut (511), the nut (511) is provided with an annular baffle (5111), the diameter of the annular baffle (5111) is larger than the diameter of the operating hole (43), and is used to prevent the screw from coming out of the operating hole (43).

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