CN214254887U - Plug with locking function and connector comprising plug - Google Patents

Abstract

The utility model discloses a take locking function's plug and include its connector, the plug main part sets up the spout, fitting pin swing joint is in the plug main part, the fitting pin sets up draw-in groove and hasp portion, hasp portion is used for buckle connection socket, the elastic component setting is in the plug main part, the fitting pin is connected to the elastic component, can drive the fitting pin toward locking position or backstop displacement move, cramp swing joint is in the spout, but cramp buckle connection slot makes hasp portion keep buckle connection socket. The plug is used for connecting the socket; the anti-touch locking structure is simple and practical, few in parts and low in cost; the buckle sheet is buckled with the clamping groove to indicate that the plug and the socket are locked in place, otherwise, the plug and the socket are in a stop position or a clearance position.

Description

Plug with locking function and connector comprising plug

Technical Field

The utility model relates to a, in particular to plug of area locking function reaches connector including it.

Background

The connector includes a plug and a socket, and the socket is generally fixedly mounted on a box, a shell, a plate, a wall or the like, and is called a 'seat'. Based on the consideration of safety, part manufacturers set locking pins, and after the plug is plugged into the socket, the locking pins connect the plug and the socket in a buckling mode.

However, in the prior art, the locking pin is easily slid and unlocked due to the fact that the locking pin is touched, the plug can be separated from the socket, and the corresponding circuit and the corresponding equipment are affected.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a take locking function's plug, plug have prevent mistake and touch the function, promptly: even if the locking pin is touched by accident, the locking pin is not easy to slide and unlock.

The utility model discloses still provide a connector that has above-mentioned area locking function plug.

According to the utility model discloses a take plug of locking function of first aspect embodiment for connect the socket, including plug main part, fitting pin, elastic component and cramp, the plug main part is provided with the spout, fitting pin swing joint is in the plug main part, the fitting pin sets up draw-in groove and hasp portion, hasp portion is used for the buckle to connect the socket, the elastic component sets up in the plug main part, the elastic component is connected the fitting pin, the elastic component can drive the fitting pin removes, cramp swing joint is in the spout, but the cramp buckle is connected the draw-in groove makes hasp portion keeps the buckle to connect the socket.

According to the utility model discloses a take locking function's plug has following beneficial effect at least: taking the buckle sheet connected to the left side of the plug as an example, when the plug is not plugged into the socket in a normal state, the elastic piece drives the locking pin to move more leftwards, and when the socket is plugged into the plug upwards, the socket is stopped by the locking pin and cannot be plugged in place; because the left end of the locking pin penetrates through the left side of the plug main body, the left end of the locking pin is pressed, the locking pin moves rightwards to deform the elastic piece, the locking pin moves rightwards to avoid opening, and the upper end of the socket can be inserted into the plug in place; then the locking pin is loosened, the elastic piece drives the locking pin to move to the left to a locking position and locks the upper end of the socket; the elastic piece is contracted and expanded by pressing and releasing the locking pin, so that the function of the elastic lock catch is achieved; when the plug and the socket are separated in a normal state, or the locking pin is not pressed, and the plug and the socket start to be butted and are not inserted in place, the left end of the locking pin protrudes out of the left side of the plug main body, and the buckling piece cannot slide downwards and cannot buckle the locking pin; when the locking pin is pressed to be in the vacancy avoiding position, the clamping groove does not correspond to the buckle sheet, the buckle sheet cannot be connected with the clamping groove in a buckling mode, when the plug and the socket are matched and locked to the position, the buckle sheet can just slide downwards to be connected with the clamping groove on the locking pin in a buckling mode, the locking pin is clamped by the buckle sheet, and the locking pin cannot be unlocked by pressing, so that the protection effect is achieved; the locking pin is pressed to avoid the clearance, the plug and the socket are inserted in place, the locking pin is released, quick locking is achieved, and the locking system can prevent the plug and the socket from being unlocked due to the fact that the locking pin is touched by mistake.

According to some embodiments of the utility model, the fitting pin shelters from the opening of spout, the fitting pin will the cramp restriction is in the spout. The buckle piece and the locking pin form an interlocking structure, the buckle piece is used for locking the locking pin, so that the locking pin cannot move, the locking pin blocks the opening of the sliding groove, the buckle piece cannot be separated from the sliding groove, and the buckle piece and the locking pin are interlocked together.

According to some embodiments of the utility model, the inner wall of spout with one of them is provided with the lock joint concave part in the cramp, another is provided with the lock joint arch, the lock joint concave part with one of them is provided with at least one, another is provided with at least two in the lock joint arch, the protruding connection of lock joint corresponds the cramp stops in the time of the lock joint concave part different positions in the spout.

According to some embodiments of the present invention, the fastening protrusion is provided with at least two. Taking the buckling piece moving up and down in the sliding groove as an example, the buckling protrusions are provided with at least two, so that when the buckling piece moves up and down in the sliding groove, the buckling piece cannot swing back and forth by taking a single buckling protrusion as a fulcrum, and the buckling piece moves stably and is buckled or separated from the clamping groove more accurately.

According to some embodiments of the utility model, the cramp includes body piece and shell fragment, the shell fragment sets up the lock joint concave part or the lock joint is protruding.

According to the utility model discloses a some embodiments, the setting of lock joint concave part is in plug main part is last, the protruding setting of lock joint is in on the buckle, plug main part still be provided with communicate to the viewing aperture of lock joint concave part, through the connection can be looked over to the viewing aperture the lock joint of lock joint concave part is protruding. The fastening concave part and the observation port are combined and designed skillfully, the structure is simple, and the practicability is strong; looking up which buckling concave part the buckling protrusion is located, the buckling piece can be judged whether to be located in the locking position or not at the moment when buckled or separated from the locking pin.

According to some embodiments of the invention, the cleat is provided with a push-pull portion. The hand-held push-pull part can push and pull the buckle sheet, so that the buckle sheet is lightly driven to be buckled with or separated from the locking pin, and the buckling protrusion is lightly driven to be buckled with or separated from the buckling concave part.

According to some embodiments of the utility model, the lock joint breach has been seted up to the cramp, the both sides limit of lock joint breach lock joint respectively last correspondence of fitting pin the draw-in groove. The locking pin is buckled on both sides of the buckling notch, namely, the two sides of the axial lead of the locking pin are provided with corresponding structures for buckling connection, the locking pin is firmly buckled, and the buckling piece is not easy to deform.

According to some embodiments of the utility model, the plug main part is offered and is used for the assembly the fitting pin with the through-hole of elastic component, the through-hole link up the left and right sides of plug main part, the fitting pin is worn out partially the one end of through-hole, the other end of through-hole is connected with the closing cap, the closing cap will the fitting pin with the elastic component encapsulation is in the through-hole.

According to a second aspect of the present invention, there is provided a connector comprising a socket and a plug, wherein a peripheral wall of an upper end of the socket is provided with a flange, and the locking pin is used for stopping the flange.

According to the utility model discloses connector has following beneficial effect at least: the elastic piece is contracted and expanded by pressing and releasing the locking pin, so that the function of the elastic lock catch is achieved; when the plug and the socket are separated in a normal state, or the locking pin is not pressed, and the plug and the socket start to be butted and are not inserted in place, the left end of the locking pin protrudes out of the left side of the plug main body, and the buckling piece cannot slide downwards and cannot buckle the locking pin; when the locking pin is pressed to be in the vacancy avoiding position, the clamping groove does not correspond to the buckle sheet, the buckle sheet cannot be connected with the clamping groove in a buckling mode, when the plug and the socket are matched and locked to the position, the buckle sheet can just slide downwards to be connected with the clamping groove on the locking pin in a buckling mode, the locking pin is clamped by the buckle sheet, and the locking pin cannot be unlocked by pressing, so that the protection effect is achieved; the locking pin is pressed to avoid the clearance, the plug and the socket are inserted in place, the locking pin is released, quick locking is achieved, and the locking system can prevent the plug and the socket from being unlocked due to the fact that the locking pin is touched by mistake.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of a connector according to an embodiment of the present invention;

FIG. 2 is an exploded view of the connector shown in FIG. 1;

fig. 3 is a first perspective view structural diagram of the plug main body of the connector shown in fig. 1;

FIG. 4 is a second perspective view of the plug body of the connector of FIG. 1;

FIG. 5 is an enlarged view of a portion of FIG. 1 at A;

FIG. 6 is an enlarged view of a portion of FIG. 4 at B;

fig. 7 is a schematic view of the structure of the blade of the connector shown in fig. 1.

The plug comprises a plug main body 100, a sliding groove 110, a buckling concave part 111, a viewing port 120 and a through hole 130;

a locking pin 200, a locking groove 210, a locking part 220;

an elastic member 300;

the buckle piece 400, the body piece 400a, the elastic piece 400b, the buckling protrusion 410, the push-pull part 420 and the buckling notch 430;

a cover 500, a socket 600, a flange 610, a nut 700.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, a plurality of means are one or more, and a plurality of means are two or more. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

Referring to fig. 1 to 7, a plug with a locking function according to an embodiment of the first aspect of the present invention is used for connecting a socket 600, including a plug main body 100, a locking pin 200, an elastic member 300 and a buckle piece 400, the plug main body 100 is provided with a sliding slot 110, the locking pin 200 is movably connected in the plug main body 100, the locking pin 200 is provided with a clamping slot 210 and a locking portion 220, the locking portion 220 is used for fastening the socket, the elastic member 300 is arranged in the plug main body 100, the elastic member 300 is connected with the locking pin 200, the elastic member 300 can drive the locking pin 200 to move, the buckle piece 400 is movably connected in the sliding slot 110, and the buckle piece 400 can be fastened with the clamping slot 210.

The first side of the plug main body 100 is provided with a sliding groove 110, and the first side is a left side or a right side. The locking pin 200 can move left and right and sequentially passes through the idle position avoidance position, the locking position and the stopping position in the left and right movement, the plug main body 100 and the socket 600 can be stopped to be inserted when the locking pin 200 is positioned at the stopping position, the plug main body 100 and the socket 600 can be connected in a buckling mode when the locking pin 200 is positioned at the locking position, and the locking pin 200 penetrates through the first side of the plug main body 100.

Because the elastic member 300 can drive the locking pin 200 to move, therefore: when the locking pin 200 is engaged with the buckle 400 (i.e., the buckle 400 is engaged with the slot 210), the locking pin 200 tends to move due to the elastic force of the elastic member 300, so that the engagement is more secure, and when the buckle 400 is disengaged from the slot 210, the elastic member 300 drives the locking pin 200 to move, so that the slot 210 is away from the buckle 400. The resilient member 300 drives the locking pin 200 toward the locking position or the stopping position.

If the resilient member 300 drives the locking pin 200 to move more to the left (i.e., the locking pin 200 is in the stop position) when the socket is still in the position below the locking pin 200, the locking pin 200 will block the upward movement of the socket. Conversely, if the locking pin 200 is retracted more to the right (i.e., the locking pin 200 is in the clearance position), the locking pin 200 is avoided and the socket can move upward.

The socket 600 is generally fixedly installed on a box, a shell, a plate, even a wall, and the like, and therefore is called a "seat", a first conductive member is arranged in the socket 600, a second conductive member is arranged in the plug main body 100, and the second conductive member is generally connected with a cable; one of the first conductive member and the second conductive member is generally a metal pin and the other is a metal sleeve. When the plug and the socket 600 are inserted in place, the first conductive member and the second conductive member are electrically connected. The second conductive member is soldered to the end of the cable, and the nut 700 typically seals over this soldered location and even secures the cable end enclosure.

In the plug main body 100 and the socket 600, one of them is provided with a contraposition convex rib, and the other is provided with a contraposition slot, and the plug and the socket 600 are in contraposition insertion, and the inserted plug and the socket 600 are difficult to relatively rotate, so that the stability and the safety of electric connection are ensured.

"the first side of the plug main body 100 is provided with the slide groove 110, and the first side is left or right side", it is understood that: when the first side is the left side, referring to fig. 1, 2, 3 and 4, the left side of the plug main body 100 is provided with a sliding groove 110, the locking pin 200 passes through the left side of the plug main body 100, the left end of the locking pin 200 is like a button, and the locking pin 200 moves to the right when a hand presses the button; when the first side is the right side, the right side of the plug main body 100 is provided with the slide groove 110, the locking pin 200 passes through the right side of the plug main body 100, and the right end of the locking pin 200 is like a button.

The first side is the left side or the right side, and the position of the sealing cover is correspondingly corrected, namely, the replacement is equivalent.

The elastic member 300 may be a spring, an elastic plastic member, a disc spring, a tension spring, etc.

According to the utility model discloses a take locking function's plug has following beneficial effect at least: taking the first side as the left side as an example, when the plug is not plugged into the socket 600 in a normal state, the elastic element 300 drives the locking pin 200 to move more leftwards, and when the socket 600 is plugged into the plug upwards, the locking pin 200 stops blocking and cannot be plugged in place; because the left end of the locking pin 200 passes through the left side of the plug main body 100, the left end of the locking pin 200 is pressed to move the locking pin 200 to the right and deform the elastic element 300, the locking pin 200 moves to the right to avoid opening, and the upper end of the socket 600 can be inserted into the plug in place; further, the locking pin 200 is released, and the elastic member 300 drives the locking pin 200 to move to the left to the locking position and lock the upper end of the socket 600; the elastic member 300 is contracted and expanded by pressing and releasing the locking pin 200, so that the function of elastic locking is achieved; when the plug and the socket 600 are separated in a normal state, or the locking pin 200 is not pressed, the plug and the socket 600 start to be butted and are not inserted in place, the left end of the locking pin 200 protrudes out of the left side of the plug main body, and the buckle piece 400 cannot slide downwards and cannot buckle the locking pin 200; when the locking pin 200 is pressed to enable the locking pin 200 to be located in the vacancy-avoiding position, the clamping groove does not correspond to the buckle sheet 400, the buckle sheet 400 cannot be connected with the clamping groove 210 in a buckling mode, when the plug and the socket 600 are matched and locked in place, the buckle sheet 400 can just slide downwards and is further connected with the clamping groove 210 in the locking pin 200 in a buckling mode, the locking pin 200 is clamped by the buckle sheet 400, and the locking pin 200 cannot be pressed and unlocked, so that the protection effect is achieved; the locking pin 200 is pressed to avoid the clearance, and then the plug and the socket 600 are inserted in place, so that the locking pin 200 is released, quick locking is realized, and the situation that the plug and the socket 600 are unlocked due to mistaken touch of the locking pin 200 can be prevented. The anti-touch locking structure is simple and practical, has few parts and low cost, and has more competitiveness on the same anti-touch locking function; the buckle piece 400 is buckled with the slot 210, which means that the plug and the socket 600 are connected and locked in place, otherwise the locking pin 200 is in a stop position or an idle position and the buckle piece 400 cannot be buckled with the slot.

Referring to fig. 1 and 5, in some embodiments of the present invention, the locking pin 200 covers the opening of the sliding groove 110, and the locking pin 200 limits the buckle 400 to the sliding groove 110. The buckle 400 and the locking pin 200 form an interlocking structure, the buckle 400 is used for locking the locking pin 200, so that the locking pin 200 cannot move, the locking pin 200 blocks the opening of the sliding groove 110, the buckle 400 cannot be separated from the sliding groove 110, and the buckle 400 and the locking pin 200 are interlocked.

Referring to fig. 1, 6 and 7, in some embodiments of the present invention, one of the inner wall of the sliding chute 110 and the fastening piece 400 is provided with a fastening concave portion 111, and the other is provided with a fastening protrusion 410, one of the fastening concave portion 111 and the fastening protrusion 410 is provided with at least one, and the other is provided with at least two, and the fastening piece 400 stays at different positions in the sliding chute 110 when the fastening protrusion 410 is connected to the corresponding fastening concave portion 111.

Referring to fig. 6 and 7, in some embodiments of the present invention, at least two fastening protrusions 410 are provided. Taking the fastening piece 400 moving up and down in the sliding slot 110 as an example, at least two fastening protrusions 410 are provided, so that when the fastening piece 400 moves up and down in the sliding slot 110, the fastening piece 400 does not swing back and forth with a single fastening protrusion 410 as a fulcrum, and the fastening piece 400 moves smoothly and is fastened or separated from the clamping slot 210 more accurately. In some embodiments of the present invention, at least two fastening protrusions 410 are provided, and at least three fastening recesses 111 are provided, so that the fastening between the fastening sheet 400 and the plug main body 100 is relatively firm, and the fastening sheet 400 is not easy to disengage from the slot 210.

Referring to fig. 2 and 7, in some embodiments of the present invention, the fastening sheet 400 includes a body sheet 400a and an elastic sheet 400b, and the elastic sheet 400b is provided with a fastening concave portion 111 or a fastening protrusion 410.

Referring to fig. 6 and 7, in some embodiments of the present invention, the fastening concave portion 111 is disposed on the plug main body 100, the fastening protrusion 410 is disposed on the fastening plate 400, the plug main body 100 is further provided with a viewing port 120 communicating with the fastening concave portion 111, and the fastening protrusion 410 connected to the fastening concave portion 111 can be viewed through the viewing port 120. The fastening concave part 111 and the observation port 120 are smartly combined, so that the structure is simple and the practicability is high; by looking at which of the fastening recesses 111 the fastening protrusion 410 is located, it can be determined whether the fastening tab 400 is fastened to or separated from the locking pin 200, and whether the locking pin 200 is located in the locking position.

Referring to fig. 1, 2, 5 and 7, in some embodiments of the present invention, the cleat 400 is provided with a push-pull portion 420. The hand-held push-pull portion 420 can push and pull the clip 400, so as to easily drive the clip 400 to be fastened to or separated from the locking pin 200 and the fastening protrusion 410 to be fastened to or separated from the fastening recess 111.

Referring to fig. 1, 2, 5 and 7, in some embodiments of the present invention, the fastening sheet 400 is provided with a fastening gap 430, and two sides of the fastening gap 430 are respectively fastened to the corresponding slots 210 of the locking pin 200. Both sides of the fastening notch 430 are fastened to the locking pin 200, that is, both sides of the axial line of the locking pin 200 have corresponding structures for fastening (referring to fig. 1, both the front side and the rear side of the locking pin 200 are fastened by the fastening pin), the locking pin 200 is fastened firmly, and the fastening plate 400 is not easily deformed.

Referring to fig. 2, 3, 4 and 6, in some embodiments of the present invention, the plug main body 100 is provided with a through hole 130 for assembling the locking pin 200 and the elastic member 300, the through hole 130 penetrates through the left and right sides of the plug main body 100, the locking pin 200 partially penetrates through one end of the through hole 130, the other end of the through hole 130 is connected with a sealing cover 500, and the sealing cover 500 seals the locking pin 200 and the elastic member 300 in the through hole 130.

Referring to fig. 1 and 2, a connector according to an embodiment of the second aspect of the present invention includes a socket 600 and a plug, a peripheral wall of an upper end of the socket 600 is provided with a flange 610, and a locking pin 200 for stopping the flange 610.

When the locking pin 200 is at the stop position, the locking pin 200 stops the flange 610, that is, the flange 610 cannot be upward, and the socket cannot be upward inserted in place; when the locking pin 200 is in the locking position, the locking pin 200 stops the flange 610, i.e., the flange 610 cannot be moved downward and the socket cannot be moved downward.

According to the utility model discloses connector has following beneficial effect at least: the elastic member 300 is contracted and expanded by pressing and releasing the locking pin 200, so that the function of elastic locking is achieved; when the plug and the socket 600 are separated in a normal state, or the locking pin 200 is not pressed, the plug and the socket 600 start to be butted and are not inserted in place, the left end of the locking pin 200 protrudes out of the left side of the plug main body, and the buckle piece 400 cannot slide downwards and cannot buckle the locking pin 200; when the locking pin 200 is pressed to enable the locking pin 200 to be located in the vacancy-avoiding position, the clamping groove 210 does not correspond to the buckle sheet 400, the buckle sheet 400 cannot be connected with the clamping groove 210 in a buckling mode, when the plug and the socket 600 are matched and locked in place, the buckle sheet 400 can just slide downwards to be connected with the clamping groove 210 on the locking pin 200 in a buckling mode, the locking pin 200 is clamped by the buckle sheet 400, and the locking pin 200 cannot be pressed and unlocked, so that the protection effect is achieved; the locking pin 200 is pressed to avoid the clearance, the plug and the socket 600 are inserted in place, the locking pin 200 is released, quick locking is achieved, and the locking system can prevent the plug and the socket 600 from being unlocked due to the fact that the locking pin 200 is touched by mistake.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims (10)

1. A plug with a locking function for connecting a socket (600), comprising:

a plug main body (100) provided with a slide groove (110);

the locking pin (200) is movably connected in the plug main body (100), the locking pin (200) is provided with a clamping groove (210) and a locking part (220), and the locking part (220) is used for being in snap-fit connection with the socket;

an elastic member (300) provided in the plug main body (100), connected to the locking pin (200), and driving the locking pin (200) to move;

the buckle piece (400) is movably connected in the sliding groove (110), and the buckle piece (400) can be connected with the clamping groove (210) in a buckling mode, so that the buckling part (220) keeps buckling the socket.

2. The plug with locking function according to claim 1, wherein the locking pin (200) blocks the opening of the slide groove (110), and the locking pin (200) restrains the buckle piece (400) to the slide groove (110).

3. The plug with locking function according to claim 1, wherein one of the inner wall of the sliding groove (110) and the fastening piece (400) is provided with a fastening concave portion (111), and the other is provided with a fastening convex portion (410), at least one of the fastening concave portion (111) and the fastening convex portion (410) is provided, and the other is provided with at least two, and the fastening piece (400) stays at different positions in the sliding groove (110) when the fastening convex portion (410) is connected with the corresponding fastening concave portion (111).

4. Plug with locking function according to claim 3, characterized in that said snap-on projections (410) are provided in at least two.

5. Plug with locking function according to claim 3 or 4, wherein said snap tab (400) comprises a body piece (400a) and a spring piece (400b), said spring piece (400b) being provided with said snap recess (111) or said snap projection (410).

6. The plug with locking function according to claim 3 or 4, wherein the hooking recess (111) is provided on the plug main body (100), the hooking protrusion (410) is provided on the blade (400), and the plug main body (100) is further provided with a viewing port (120) communicating to the hooking recess (111), and the hooking protrusion (410) connected to the hooking recess (111) is viewable through the viewing port (120).

7. Plug with locking function according to any one of claims 1 to 4, characterized in that the blades (400) are provided with a push-pull (420).

8. The plug with locking function according to any one of claims 1 to 4, wherein the buckle piece (400) is provided with a buckling notch (430), and two sides of the buckling notch (430) are buckled with the corresponding slots (210) of the locking pin (200), respectively.

9. The plug with the locking function according to any one of claims 1 to 4, wherein the plug body (100) is provided with a through hole (130) for assembling the locking pin (200) and the elastic member (300), the through hole (130) penetrates through the left and right sides of the plug body (100), the locking pin (200) partially penetrates through one end of the through hole (130), the other end of the through hole (130) is connected with a cover (500), and the cover (500) encapsulates the locking pin (200) and the elastic member (300) in the through hole (130).

10. A connector is characterized by comprising

The plug of any one of claims 1 to 9,

and a socket (600) having a flange (610) formed on a peripheral wall of an upper end thereof, wherein the locking pin (200) is used for stopping the flange (610).

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