CN113690672B

CN113690672B - External socket protection device

Info

Publication number: CN113690672B
Application number: CN202111027257.2A
Authority: CN
Inventors: 刘仁淦; 崔长将
Original assignee: CIG Shanghai Co Ltd
Current assignee: CIG Shanghai Co Ltd
Priority date: 2021-09-02
Filing date: 2021-09-02
Publication date: 2023-07-14
Anticipated expiration: 2041-09-02
Also published as: CN113690672A

Abstract

The invention discloses an external socket protection device, which comprises: the rotary cover is used for covering the socket or limiting the outer joint in the socket to be separated, a limiting block is formed by extending outwards towards one end of the socket, and the limiting block abuts against the outer joint inserted into the socket and limits the outer joint to be separated from the socket. According to the invention, the rotary cover is rotationally connected with the mounting seat, and the limiting block is formed by extending outwards towards one end of the socket of the rotary cover, so that the socket is covered to achieve the aim of dust prevention, the outer joint in the socket is limited to be separated, and the stability of the connection of the outer joint and the socket is improved.

Description

External socket protection device

Technical Field

The invention relates to the technical field of socket protection, in particular to an external socket protection device.

Background

At present, electronic equipment is mostly provided with an external socket for connecting an external connector, and in order to avoid entering of sundries such as dust, the vicinity of the socket is mostly provided with a protection device for closing the open socket, so that the dustproof requirement of the electronic equipment is met.

Most of the current protection devices are rotary covers, which cover the socket to close the socket when the socket is not in use, and which are turned over to expose the socket and then insert the external connector when the socket is in use. For example, CN104991317a discloses that the first adapter 22 includes a first fixing member 222 and a first dust cover 223, … …, where the first dust cover 223 is located in the first accommodating cavity R1 and is rotationally connected to the first fixing member 222, and the first dust cover 223 is used to block or open the first socket C1. Firstly, however, the rotary cover only covers the front end face of the socket, the rotary cover is not accurately installed and positioned or is easy to shake left and right in the long-term use process to generate a gap with the socket, so that the sealing effect is poor, and dust is easy to enter; secondly, the outer joint is easy to separate from the socket, and particularly the rotary cover is abutted against the upper side of the outer joint, so that downward pressure is generated on the outer joint, and the outer joint is further loosened and separated from the socket. Therefore, in view of the above problems, it is necessary to propose a further solution to at least one of the problems.

Disclosure of Invention

The invention aims to provide an external socket protection device so as to overcome the defects in the prior art.

In order to solve the technical problems, the technical scheme of the invention is as follows:

an external socket protection device, comprising:

the rotary cover is used for covering the socket or limiting the outer joint in the socket to be separated, a limiting block is formed by extending outwards towards one end of the socket, and the limiting block abuts against the outer joint inserted into the socket and limits the outer joint to be separated from the socket.

In a preferred embodiment of the present invention, the rotary cover includes a cover plate and two side wings disposed on left and right sides of the cover plate, the cover plate is used to cover the front end of the socket, and the side wings are used to be at least partially inserted into the socket and close to the inner side wall of the socket.

In a preferred embodiment of the invention, the limiting block is provided with a guide surface at one side away from the socket, and the guide surface is inclined towards the direction of the socket so as to guide the outer joint to contact with the limiting block to drive the rotary cover to rotate in a direction away from the socket.

In a preferred embodiment of the present invention, the limiting block further includes a sliding surface disposed on a side of the guide surface adjacent to the socket, and the outer joint moving in and out of the socket moves along the sliding surface.

In a preferred embodiment of the present invention, the mounting base is rotatably connected to the rotary cover by a torsion spring.

In a preferred embodiment of the present invention,

a first groove is formed in one end of the mounting seat;

through holes penetrating through two opposite ends of the rotary cover are formed in positions, corresponding to the first grooves, of the rotary cover, the rotary cover rotates to enable the through holes to be communicated with the first grooves, and central axes of the through holes and the first grooves coincide; and the protection device further comprises:

the size of the fixing rod is matched with the size of the through hole and the size of the first groove, the fixing rod is arranged in the through hole and is connected with the first groove in a plug-in mode, and the fixing rod is inserted into the first groove to enable the relative position of the rotary cover and the mounting seat to be fixed.

In a preferred embodiment of the present invention, the length of the fixing rod is greater than the sum of the depths of the through hole and the first groove.

In a preferred embodiment of the present invention, the fixing rod includes a rod portion and a ball portion disposed at a front end of the rod portion, sizes of the ball portion, the rod portion and the first groove cooperate to limit a deflection angle of the limiting block to be a, the outer joint drives the limiting block to deflect to be b so that the sliding surface is in stable contact with the outer joint, and a is greater than or equal to b.

In a preferred embodiment of the present invention, the radius of the ball portion is larger than the minimum radius of the through hole and the maximum radius of the first groove, and the radius of the stem portion is smaller than the minimum radius of the through hole and the maximum radius of the first groove.

In a preferred embodiment of the present invention, the through hole includes a back avoiding section and a limiting section in a direction away from the first groove, the size of the back avoiding section is matched with the size of the ball head to accommodate the ball head, and the radius of the limiting section is smaller than that of the ball head.

In a preferred embodiment of the present invention, the through hole further includes a front avoidance section, the front avoidance section is disposed at an end of the limiting section away from the rear avoidance section, and a radius of the front avoidance section is greater than a radius of the ball head.

In a preferred embodiment of the present invention, the mounting seat is provided with a plurality of second grooves spaced apart along the circumference of the first groove.

In a preferred embodiment of the present invention, the side edge of the second groove communicates with the side edge of the first groove.

In a preferred embodiment of the present invention, at least one of the second grooves is formed at an end of the rotating cover, which is far away from the outer joint in the rotating direction.

In a preferred embodiment of the present invention, the rotary cover includes two side wing plates, and a cover plate and a through hole plate connected in an L shape and located between the two side wing plates, the cover plate is used for covering the front end of the socket, the side wing plates are used for being at least partially inserted into the socket and being close to the inner side wall of the socket, an arc-shaped abutting part is bent and extended inwards on one side of the through hole plate opposite to the cover plate, two ends of the arc-shaped abutting part are respectively connected with the two side wing plates, a front projection of a covering end surface s formed by the rotary cover covering the socket and located on the through hole plate is a line segment L, and two ends of the line segment L are located in the arc-shaped abutting part.

In a preferred embodiment of the present invention, the fixing rod further includes a hand-holding part disposed at a rear end of the rod part.

In a preferred embodiment of the present invention, an annular groove is formed in the first groove at a position corresponding to the ball head portion, and the annular groove is matched with the ball head portion so that the ball head portion is embedded in the annular groove.

In a preferred embodiment of the invention, the rotary cover and the mounting base are plastic pieces and/or the fixing rod is a plastic piece.

Compared with the prior art, the invention has the beneficial effects that:

(1) According to the invention, the rotary cover is rotationally connected with the mounting seat, and the limiting block is formed by extending outwards towards one end of the socket of the rotary cover, so that the socket is covered to achieve the aim of dust prevention, the outer joint in the socket is limited to be separated, and the stability of the connection of the outer joint and the socket is improved.

(2) According to the invention, the covering of the front end face of the socket is realized by arranging the shielding plate, and the covering of the inner side wall of the socket is realized by the side wing plate, so that dust is prevented from entering the socket rapidly through a gap between the shielding plate and the socket, and meanwhile, the shielding plate is prevented from shaking left and right to separate from the front end face of the socket, and the dustproof effect is further improved.

(3) According to the invention, the rotary cover is fixed by arranging the first groove, the through hole and the fixing rod in a matched manner, so that the outer joint is prevented from being separated from or damaged by the outer joint due to the fact that the rotary cover is extruded downwards or the limiting block excessively.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings may be obtained according to the drawings without inventive effort to those skilled in the art.

FIG. 1 is an exploded view of the present invention;

FIG. 2 is a schematic view of a use state of the present invention;

FIG. 3 is a schematic view of another use state of the present invention;

FIG. 4 is a schematic view in partial cross-section of FIG. 3;

FIG. 5 is a schematic perspective view of a rotary cover according to the present invention;

FIG. 6 is a schematic view of another perspective view of the rotary cover of the present invention with one side wing plate omitted;

FIG. 7 is a side view schematic of FIG. 6;

FIGS. 8a-c are partial schematic views of the present invention during use;

FIG. 9 is a schematic view in partial cross-section of FIG. 2;

FIG. 10 is a schematic view of a fixing rod according to the present invention;

FIG. 11 is a schematic perspective view of a mounting base according to the present invention;

FIG. 12 is an enlarged schematic view of a portion of a mounting block according to the present invention;

fig. 13 is an enlarged schematic view of a portion of another embodiment of a mount of the present invention.

Specifically, 10, an outer joint;

20. an electronic device; 21. a socket; 22. an inner joint;

100. a mounting base; 110. a first groove; 120. a second groove;

200. a rotary cover; 201. a through hole; 2011. a front avoidance section; 2012. a restriction section; 2013. a rear avoidance section; 210. a limiting block; 211. a guide surface; 212. a sliding surface; 213. an abutment surface; 220. a side wing plate; 230. a cover plate; 240. a through hole plate; 241. an arc-shaped abutting part;

300. a fixed rod; 310. a stem portion; 320. a ball head portion; 330. a hand-held part;

400. and (3) a torsion spring.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the scope of the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may include one or more of the feature, either explicitly or implicitly. In the description of the invention, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.

As shown in fig. 1, an external socket protection device includes a mounting base 100 and a rotary cover 200 that are rotatably connected. The mounting base 100 is used for mounting an accessory to the socket 21 of the electronic device 20, and may be fixed by screws or the like or integrally formed with the housing of the electronic device 20, and the socket 21 is provided with an inner joint 22 for connecting with the outer joint 10.

As shown in fig. 3, the rotary cover 200 is used to cover the socket 21 to prevent dust, or as shown in fig. 2, the rotary cover 200 is used to restrict the outer joint 10 located inside the socket 21 from being detached. Specifically, as shown in fig. 5 to 7, the rotary cover 200 is formed with a restriction block 210 extending outwardly toward one end of the socket 21, the restriction block 210 abutting against the external joint 10 inserted into the socket 21 and restricting the external joint 10 from being separated from the socket 21, thereby improving the stability of the connection of the external joint 10 with the socket 21.

As shown in fig. 4 and 5, in one embodiment, the rotary cover 200 includes a cover 230 and two side wings 220 provided at left and right sides of the cover 230. The shielding plate 230 is used for covering the front end of the socket 21, and the side wing plate 220 is used for being at least partially inserted into the socket 21 and being close to the inner side wall of the socket 21, so that dust is prevented from entering the socket 21 from a gap between the shielding plate 230 and the socket 21, and meanwhile, the shielding plate 230 is prevented from shaking left and right to be separated from the front end surface of the socket 21, and the dust prevention effect is improved. It will be appreciated that the nipple 22 in the socket 21 is now spaced from the front face of the socket 21 to accommodate the side wings 220.

In another embodiment, the rotary cap 200 includes two flanks 220 and a cover plate 230 and a through-hole plate 240 in an L-shaped connection between the two flanks 220. A cover 230 is provided to cover the front end of the socket 21. The side wings 220 are adapted to be at least partially inserted into the socket 21 and proximate the inside wall of the socket 21. The opposite side of orifice plate 240 and shielding plate 230 is inwards crookedly extended has arc portion of leaning on 241, and arc portion of leaning on 241's both ends are connected with two flank plates 220 respectively, and rotatory lid 200 covers the orthographic projection that socket 21 formed cover terminal surface s was located orifice plate 240 and is line segment L, and line segment L's both ends all are located arc portion of leaning on 241, and rotatory lid 200 covers when socket 21 promptly, arc portion of leaning on 241 part of leaning on is leaned on socket 21 in order to avoid the dust to get into by the clearance between orifice plate 240 and the socket 21, improves dustproof effect.

As shown in fig. 6 and 7, the restriction block 210 is provided with a guide surface 211 on a side facing away from the insertion opening 21, the guide surface 211 being inclined in a direction in which the insertion opening 21 is located. Referring to fig. 8 (a), when the outer joint 10 moves in the direction of the socket 21, the outer joint 10 first contacts the guide surface 211, and the outer joint 10 pushes the guide surface 211 to rotate the rotary cover 200 in a direction away from the socket 21, that is, the rotary cover 200 is deflected clockwise in the drawing.

The restriction block 210 further includes a sliding surface 212 provided on a side of the guide surface 211 near the socket 21, and the external joint 10 entering and exiting the socket 21 moves along the sliding surface 212. Referring to fig. 8 (b), the outer joint 10 enters the sliding surface 212 from the end of the guiding surface 211, that is, the limiting block 210 completes the avoidance of the outer joint 10, the outer joint 10 moves along the sliding surface 212 toward the socket 21, and the rotary cover 200 is not deflected any more.

Of course, the limiter block 210 includes an abutment surface 213 to abut the outer joint 10 located within the socket 21. Referring to fig. 8 (c), the abutment surface 213 is provided on the side of the sliding surface 212 away from the guide surface 211, and the outer joint 10 enters the abutment surface 213 from the end of the sliding surface 212, and the abutment surface 213 generates a thrust force toward the socket 21 on the end of the outer joint 10, thereby ensuring that the outer joint 10 is not separated from the socket 21.

In a specific embodiment, the mounting base 100 is rotatably connected with the rotary cover 200 through the torsion spring 400, the rotary cover 200 tightly covers the socket 21 (refer to fig. 3) under the action of the torsion spring 400, and the rotary cover 200 is manually turned clockwise to expose the socket 21, so as to insert the external connector 10 (refer to fig. 2).

Further, as shown in fig. 9, one end of the mounting seat 100 is provided with a first groove 110, the position of the rotary cover 200 corresponding to the first groove 110 is provided with a through hole 201 penetrating through two opposite ends of the first groove, and the rotary cover 200 rotates to enable the through hole 201 to be communicated with the first groove 110, and central axes of the through hole and the first groove are coincident. The protection device further comprises a fixing rod 300, the size of the fixing rod 300 is matched with the sizes of the through hole 201 and the first groove 110, and the fixing rod 300 is arranged in the through hole 201 and is connected with the first groove 110 in a plug-in mode. The insertion of the fixing rod 300 into the first recess 110 fixes the relative positions of the rotary cap 200 and the mount 100, thereby preventing the rotary cap 200 from being pushed down or the restriction block 210 from excessively pressing the outer joint 10, causing the outer joint 10 to be separated from or damaged from the socket 21. It should be understood that the relative position of the rotary cover 200 and the mounting base 100 is fixed, that is, the rotary cover 200 cannot rotate after the fixing rod 300 is inserted into the first groove 110, and then the fixing rod 300 is inserted after the external connector 10 is inserted into the socket 21, and the fixing rod 300 makes the limiting block 210 on the rotary cover 200 generate a proper pushing force to the external connector 10; the fixed relative position may also mean that the relative position of the rotary cover 200 and the mounting base 100 is maintained within a certain angle range, that is, after the fixing rod 300 is inserted into the first groove 110, the rotary cover 200 may also be rotated by a certain angle, at this time, the external connector 10 may be inserted after the fixing rod 300 is inserted into the first groove 110, the external connector 10 may be avoided by the rotatable angle range of the rotary cover 200, and simultaneously, after the external connector 10 is inserted into the socket 21, the rotary cover 200 is rotated so that the limiting block 210 generates a proper thrust to the external connector 10.

Preferably, the length of the fixing rod 300 is greater than the sum of the depths of the through hole 201 and the first groove 110, i.e., the tail end of the fixing rod 300 is located outside the through hole 201 after being inserted into the first groove 110, so that the tail end of the fixing rod 300 can be conveniently held to control the moving in and out of the first groove 110.

As shown in fig. 10, the fixing rod 300 includes a rod portion 310 and a ball portion 320 disposed at a front end of the rod portion 310, where the ball portion 320, the rod portion 310 and the first groove 110 are sized to cooperate to limit the deflection angle of the limiting block 210 to a, i.e., the ball portion 320 drives the rod portion 310 to deflect in the first groove 110 and thus drives the limiting block 210 to deflect, and the outer joint 10 drives the limiting block 210 to deflect to b so that the sliding surface 212 is in stable contact with the outer joint 10, i.e., when the deflection angle of the limiting block 210 is b, the outer joint 10 slides stably on the sliding surface 212. In this embodiment, a is greater than or equal to b, so that the limiting block 210 can avoid the outer joint 10 to be inserted into the socket 21, that is, when the outer joint 10 needs to be inserted, the position of the rotary cover 200 is not required to be fixed by one hand after the rotary cover 200 is turned over, the other hand is inserted into the outer joint 10, the operation can be completed by one hand, firstly, the fixing rod 300 is manually controlled to rotate to drive the rotary cover 200 to turn over to the corresponding position, then the fixing rod 300 is pushed to be inserted into the first groove 110 to fix the relative positions of the rotary cover 200 and the mounting seat 100, and finally the outer joint 10 is inserted. Since the restriction block 210 is partially located on the insertion path of the outer joint 10 to finally abut against the outer joint 10 after the fixing rod 300 is inserted into the first groove 110 to fix the relative positions of the rotary cover 200 and the mounting base 100, the restriction block 210 drives the rod portion 310 to deflect through the ball portion 320 to push it to deflect so as to avoid the outer joint 10 when the outer joint 10 is inserted.

Specifically, the radius of the ball portion 320 is greater than the minimum radius of the through hole 201 and the maximum radius of the first groove 110, and the radius of the stem portion 310 is less than the minimum radius of the through hole 201 and the maximum radius of the first groove 110, so that the fixing rod 300 is moved in and out of the through hole 201 and the first groove 110 while not falling. In an embodiment, the through hole 201 sequentially includes a back avoiding section 2013 and a limiting section in a direction away from the first groove 110, where the size of the back avoiding section 2013 is matched with the ball head 320 to accommodate the ball head 320, and the radius of the limiting section is smaller than that of the ball head 320. The through hole 201 further comprises a front avoiding section 2011, the front avoiding section 2011 is arranged at one end of the limiting section, far away from the rear avoiding section 2013, and the radius of the front avoiding section 2011 is larger than that of the ball head part 320, so that the fixing rod 300 can be freely inserted. Through the arrangement of the front avoidance section 2011 and the rear avoidance section 2013, the section limited by the through hole 201 to the fixing rod 300, namely the limiting section 2012, is short in length, the weight of the rotary cover 200 is reduced, and meanwhile the fixing rod 300 can be easily inserted into the through hole 201.

Preferably, the fixing lever 300 further includes a hand grip 330 provided at the rear end of the lever portion 310. The hand-held portion 330 may be a bump or a rib that increases friction with the finger, or may be a relatively bulky cap that facilitates handling, the latter being used in this embodiment.

As shown in fig. 11, the mounting seat 100 is provided with a plurality of second grooves 120 spaced apart in the circumferential direction of the first groove 110 to reduce the weight of the mounting seat 100, while allowing the fixing rod 300 to be inserted into the first groove 110 relatively easily. Preferably, the side of the second groove 120 communicates with the side of the first groove 110. In an embodiment, as shown in fig. 12, the second groove 120 is formed in the non-rotation direction of the rotary cover 200, that is, the ball portion and the rod portion 310 are both limited by the first groove 110, so that a better limiting effect can be formed on the fixing rod 300. In another embodiment, as shown in fig. 13, at least one second groove 120 is formed at one end of the rotary cover 200 away from the outer joint 10 in the rotation direction, so that the ball portion is limited by the first groove 110, and the rod portion 310 is limited by the second groove 120, and the second groove 120 expands the circumferential width of the first groove 110, so that the rod portion 310 can deflect a larger angle than in the previous embodiment, i.e. the avoiding range of the rotary cover 200 to the outer joint 10 is larger, and the manufacture of the rotary cover 200 is facilitated. It is further preferred that the width w where the second groove 120 and the first groove 110 communicate is not smaller than the diameter of the stem 310, so that the stem 310 can enter the second groove 120 to obtain a larger deflection angle.

Preferably, an annular groove corresponding to the ball portion 320 is formed in the first groove 110, so that the ball portion 320 is embedded in the annular groove, and the ball portion 320 is not extruded in the annular groove, so as to avoid the fixing rod 300 from being separated from the first groove 110.

Preferably, the rotary cover 200 and the mounting base 100 are plastic parts, or the fixing rod 300 is a plastic part, or the rotary cover 200, the mounting base 100 and the fixing rod 300 are all plastic parts, so that the fixing rod 300 and the first groove 110 are fixed by utilizing good deformation performance and friction action of the plastic parts, and the purpose of convenient disassembly and assembly is achieved.

In summary, according to the invention, the rotary cover is rotationally connected with the mounting seat, and the limiting block is formed by extending outwards from one end of the rotary cover towards the socket, so that the socket is covered to achieve the aim of dust prevention, the outer connector in the socket is limited to be separated, the stability of the connection between the outer connector and the socket is improved, and the invention is particularly suitable for an optical fiber socket, and the dust prevention effect of the optical fiber socket is improved.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims

1. An external socket protection device, comprising:

the rotary cover is used for covering the socket or limiting the outer joint in the socket to be separated, one end of the rotary cover, which faces the socket, extends outwards to form a limiting block, and the limiting block abuts against the outer joint inserted into the socket and limits the outer joint to be separated from the socket;

the limiting block is provided with a guide surface at one side away from the socket, and the guide surface is inclined towards the direction of the socket so as to guide the outer joint to contact with the limiting block to drive the rotary cover to rotate towards the direction away from the socket;

the limiting block further comprises a sliding surface arranged on one side, close to the socket, of the guide surface, and the outer joint entering and exiting the socket moves along the sliding surface;

the mounting seat is rotationally connected with the rotary cover through a torsion spring;

a first groove is formed in one end of the mounting seat;

2. The external socket protection device according to claim 1, wherein the rotary cover comprises a cover plate and two side wing plates respectively arranged at the left side and the right side of the cover plate, the cover plate is used for covering the front end of the socket, and the side wing plates are used for being at least partially inserted into the socket and being close to the inner side wall of the socket.

3. The external socket protection device of claim 1, wherein a length of the securing lever is greater than a sum of depths of the through hole and the first groove.

4. The external socket protection device according to claim 1, wherein the fixing rod comprises a rod portion and a ball head portion arranged at the front end of the rod portion, the ball head portion, the rod portion and the first groove are matched in size to limit the deflection angle of the limiting block to be a, the outer joint drives the deflection angle of the limiting block to be b so that the sliding surface is in stable contact with the outer joint, and a is larger than or equal to b.

5. The external socket protection device of claim 4, wherein the radius of the ball portion is greater than the minimum radius of the through hole and the maximum radius of the first groove, and the radius of the stem portion is less than the minimum radius of the through hole and the maximum radius of the first groove.

6. The external socket protection device according to claim 5, wherein the through hole sequentially comprises a rear avoidance section and a limit section in a direction away from the first groove, the rear avoidance section is matched with the ball head in size to accommodate the ball head, and the limit section is smaller than the ball head in radius.