CN213755213U - Waterproof box - Google Patents

Abstract

The utility model relates to a waterproof box. The waterproof box comprises a bottom box, a face cover and a limiting rib. The bottom box is used for being connected to a wall surface, and is provided with a containing hole which is used for containing a switch on the wall surface; the surface cover is rotationally connected with one side of the bottom box far away from the wall surface; one end of the limiting rib is connected to the face cover, and the other end of the limiting rib is connected to the bottom box in a sliding mode; the bottom box is provided with an abutting part, and the limiting rib can abut against the abutting part and is used for limiting the rotation angle of the surface cover relative to the bottom box. When the face lid is opened to the user needs, exert the power of upwards opening to the face lid, at this in-process, the one end of spacing muscle can slide in end box, because the other end of spacing muscle is connected in the face lid, so when the face lid is opened, spacing muscle can butt portion and the support face lid at end box, thereby the turned angle of relative end box of face lid carries on spacingly, so that the face lid can not because of the action of gravity and direct automatic the dropping closing, user's use impression has been improved, the life of waterproof box has also been strengthened simultaneously.

Description

Waterproof box

Technical Field

The utility model relates to a switch accessory technical field especially relates to a waterproof box.

Background

In a bathroom or an outdoor environment with high humidity, the switch is likely to be short-circuited and damaged due to contact with water vapor or rainwater, so that a user has an electric shock risk in the use process, and therefore, in the use environment, adding a waterproof box to the switch is particularly important. However, in the prior art, after the waterproof box is opened and closed for many times, the face cover and the bottom box are abraded, and then the face cover is easy to automatically drop when the face cover is opened, so that the user is very inconvenient in the use process, and the use experience of the user is greatly influenced.

SUMMERY OF THE UTILITY MODEL

On the basis, the technical problem that the face cover and the bottom box are abraded after the waterproof box is opened and closed for multiple times in the prior art, and then the face cover is easy to automatically drop when the face cover is opened relative to the bottom box is needed to be solved, and the waterproof box is provided.

A waterproof case, comprising:

the bottom box is used for being connected to a wall surface, and is provided with a containing hole for containing a switch on the wall surface;

the surface cover is rotatably connected with one side of the bottom box, which is far away from the wall surface;

one end of the limiting rib is connected to the face cover, and the other end of the limiting rib is connected to the bottom box in a sliding mode; the bottom box is provided with an abutting part, and the limiting rib can abut against the abutting part and is used for limiting the rotation angle of the surface cover relative to the bottom box.

In one embodiment, the abutting part comprises an arc-shaped convex surface protruding from the bottom case, and the arc-shaped convex surface is positioned on one side of the bottom case, which is rotatably connected with the surface cover.

In one embodiment, the bottom box is provided with a sliding groove extending along the rotation direction of the surface cover, and one end of the limiting rib slides in the sliding groove.

In one embodiment, the face cover is further provided with a buckling position, the buckling position is located on one side, far away from the side rotationally connected with the bottom case, of the face cover, a clamping groove is formed in the position, corresponding to the buckling position, of the bottom case, and the buckling position can be clamped in the clamping groove when the face cover is closed relative to the bottom case.

In one embodiment, the face cover comprises a first panel and a second panel;

the first panel is provided with the mounting hole, the second panel inlays to be located in the mounting hole, the first panel can with end box joint, spacing muscle set up in the first frame wall of first panel, detain the position set up in the second frame wall of first panel, first frame wall with the relative and interval arrangement of second frame wall.

In one embodiment, a side of the second panel facing the back box is provided with a recess recessed from a side of the back box facing the face cover.

In one embodiment, the bottom box comprises a first bottom plate and a second bottom plate, the first bottom plate is provided with a mounting strip, the second bottom plate is provided with a mounting groove, and the mounting strip can be embedded in the mounting groove.

In one embodiment, the number of the mounting bars is multiple, the mounting bars are arranged at intervals along a first direction, and each mounting bar is correspondingly provided with one mounting groove.

In one embodiment, the second panel is made of transparent soft rubber, and the first panel is connected with the second panel in a sealing mode;

and/or the first bottom plate is made of soft rubber and can be hermetically connected with the wall surface outside the switch.

In one embodiment, the waterproof box further comprises a connecting shaft, the bottom box is provided with a first connecting part, and the face cover is provided with a second connecting part;

one end of the connecting shaft is rotatably connected to the inner wall of the first connecting part, and the other end of the connecting shaft is fixedly connected to the inner wall of the second connecting part; and/or one end of the connecting shaft is rotatably connected with the inner wall of the second connecting part, and the other end of the connecting shaft is fixedly connected with the inner wall of the first connecting part.

The utility model has the advantages that:

the utility model provides a pair of waterproof box, including end box, face lid and spacing muscle. The bottom box is used for being connected to a wall surface, a containing hole is formed in the middle of the bottom box, and the containing hole is used for containing a switch on the wall surface; the face lid is connected with the rotation of one side that the wall was kept away from to end box, and the one end of spacing muscle is connected in the face lid, and the other end sliding connection of spacing muscle is in end box, and end box still is provided with butt portion, and spacing muscle can be used for injecing the turned angle of the relative end box of face lid by butt portion.

When the user need open or close the switch that waterproof box inside was protected, because face lid and end box keep away from one side of wall and rotate and be connected, apply a power that upwards opens to the face lid, make the face lid can be the angle and open relatively end box, in this process, the one end of spacing muscle can slide in end box, because the other end of spacing muscle is connected in the face lid, so when the face lid is opened, spacing muscle can butt portion and the support face lid at end box, thereby the turned angle of relative end box of face lid carries on spacingly, so that the face lid can not because of the action of gravity and direct automatic the closing that drops, user's use impression has been improved, the life of waterproof box has also been strengthened simultaneously.

Drawings

Fig. 1 is a schematic view of a waterproof box provided by an embodiment of the present invention;

FIG. 2 is a schematic view of the internal structure of the waterproof case shown in FIG. 1;

FIG. 3 is an enlarged view of a portion of the waterproof case shown in FIG. 2 at A;

FIG. 4 is a second schematic view of the waterproof case of FIG. 1;

FIG. 5 is a partial enlarged view of the waterproof box shown in FIG. 4 at B;

FIG. 6 is a third schematic view of the waterproof case of FIG. 1;

FIG. 7 is a schematic view of a first base plate in the waterproof box of FIG. 1;

FIG. 8 is a schematic view of a second bottom panel of the waterproof box of FIG. 1;

FIG. 9 is a schematic view of the waterproof box shown in FIG. 1 mounted to a wall surface in an open state;

fig. 10 is a schematic view showing a closed state in which the waterproof box shown in fig. 1 is mounted to a wall surface.

Icon: 100-bottom box; 110-a first backplane; 111-mounting bars; 120-a second backplane; 121-mounting grooves; 122-a sliding groove; 123-a first connection; 124-card slot; 130-a receiving hole; 140-an abutment; 200-face cover; 210-a first panel; 211-fastening position; 212-mounting holes; 213-a second connection; 220-a second panel; 300-limiting ribs; 400-a wall surface; 500-switch.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1, fig. 1 shows a schematic view of a waterproof box in an embodiment of the present invention, which includes a bottom box 100, a face cover 200 and a limiting rib 300. The bottom case 100 is used for connecting to a wall surface 400, the bottom case 100 is provided with a containing hole 130, and the containing hole 130 is used for containing a switch 500 on the wall surface 400; the surface cover 200 is rotatably connected with one side of the bottom box 100 away from the wall surface 400; one end of the limiting rib 300 is connected to the face cover 200, and the other end of the limiting rib 300 is slidably connected to the bottom box 100; the bottom case 100 has an abutting portion 140, and the restricting rib 300 can abut against the abutting portion 140 for restricting a rotation angle of the face cover 200 with respect to the bottom case 100.

When a user needs to open or close the switch 500 protected inside the waterproof box, the face cover 200 is rotatably connected with one side of the bottom box 100 far away from the wall surface 400, an upward opening force is applied to the face cover 200, so that the face cover 200 can be opened at an angle relative to the bottom box 100, in the process, one end of the limiting rib 300 can slide in the bottom box 100, and the other end of the limiting rib 300 is connected to the face cover 200, so that when the face cover 200 is opened, the limiting rib 300 can abut against the abutting part 140 of the bottom box 100 and support the face cover 200, so that the rotating angle of the face cover 200 relative to the bottom box 100 is limited, so that the face cover 200 cannot directly and automatically fall off and close under the action of gravity, the use feeling of the user is improved, and the service life of the waterproof box is prolonged.

In one embodiment, the waterproof box provided by the embodiment of the present invention can also be used in a socket, and includes a bottom box 100, a face cover 200 and a limiting rib 300. The bottom case 100 is used for connecting to a wall surface 400, the bottom case 100 is provided with a containing hole 130, and the containing hole 130 is used for containing a socket on the wall surface 400; the surface cover 200 is rotatably connected with one side of the bottom box 100 away from the wall surface 400; one end of the limiting rib 300 is connected to the face cover 200, and the other end of the limiting rib 300 is slidably connected to the bottom box 100; the bottom case 100 has an abutting portion 140, and the restricting rib 300 can abut against the abutting portion 140 for restricting a rotation angle of the face cover 200 with respect to the bottom case 100.

It should be noted that the embodiment of the present invention provides a waterproof box, which can be used on a switch, a socket, or any device requiring waterproofing, and as long as the bottom box 100 can be connected to the wall 400, the receiving hole 130 formed in the bottom box 100 can receive the device requiring waterproofing, and no limitation is made to this.

The following description is made specifically for the structure of the waterproof box, referring to fig. 2 to 10, and fig. 2 shows an internal structural schematic view of the waterproof box shown in fig. 1; FIG. 3 shows a close-up view at A of the waterproof case shown in FIG. 2; FIG. 4 illustrates a second schematic view of the waterproof box shown in FIG. 1; FIG. 5 shows a partial enlarged view at B in the waterproof box shown in FIG. 4; FIG. 6 shows a third schematic view of the waterproof case of FIG. 1; FIG. 7 illustrates a schematic view of the first base plate 110 in the waterproof box of FIG. 1; FIG. 8 shows a schematic view of the second base plate 120 in the waterproof box of FIG. 1; fig. 9 is a schematic view showing an opened state in which the waterproof box shown in fig. 1 is mounted to a wall surface 400; fig. 10 is a schematic view illustrating a closed state in which the waterproof box shown in fig. 1 is mounted to a wall surface 400.

Specifically, the utility model provides a waterproof box, in addition to including foretell end box 100, face lid 200 and spacing muscle 300, still include the connecting axle, end box 100 is provided with first connecting portion 123, and face lid 200 is provided with second connecting portion 213. In this embodiment, one end of the connecting shaft is rotatably connected to the inner wall of the first connecting portion 123, and the other end of the connecting shaft is fixedly connected to the inner wall of the second connecting portion 213.

In another embodiment, one end of the connecting shaft is rotatably connected to the inner wall of the second connecting portion 213, and the other end of the connecting shaft is fixedly connected to the inner wall of the first connecting portion 123.

In summary, the connection shaft may be installed such that one end is fixedly connected to the inner wall of the first connection portion 123 and the other end is rotatably connected to the inner wall of the second connection portion 213. Alternatively, one end of the connecting shaft is fixedly disposed on the inner wall of the second connecting portion 213, and the other end is rotatably connected to the inner wall of the first connecting portion 123. In any arrangement, the face cover 200 may be rotatable with respect to the base case 100.

Specifically, the embodiment of the present invention provides a waterproof box, the number of the first connecting portions 123 is two, and the number of the second connecting portions 213 is two, two first connecting portions 123 are disposed at intervals on two sides of the bottom box 100 along the first direction, and the positions of the two second connecting portions 213 are adapted to the positions of the first connecting portions 123.

The number of the first connecting portions 123 may be one, three, four, etc., as long as the first connecting portions 123 and the second connecting portions 213 can be rotatably connected by the connecting shafts, and the number is not limited in any way.

Referring to fig. 2, 3 and 8, the abutting portion 140 of the waterproof box according to the embodiment of the present invention includes an arc-shaped convex surface protruding from the bottom box 100, and the arc-shaped convex surface is located on one side of the bottom box 100 rotatably connected to the front cover 200. The bottom case 100 is provided with a sliding groove 122 extending along the rotation direction of the surface cover 200, and one end of the limiting rib 300 slides in the sliding groove 122.

Specifically, when the face cover 200 is closed relative to the bottom case 100, one end of the limiting rib 300 is fixedly connected with the face cover 200, the other end of the limiting rib 300 slides to one side of the sliding groove 122 away from the abutting portion 140, when the face cover 200 rotates relative to the bottom case 100 until being opened, the other end of the limiting rib 300 slides to the sliding groove 122 above the abutting portion 140, so that the limiting rib 300 can abut against the abutting portion 140 of the bottom case 100 and support the face cover 200, thereby limiting the rotation angle of the face cover 200 relative to the bottom case 100, and preventing the face cover 200 from directly and automatically falling off and closing due to the action of gravity.

Referring to fig. 1, 4, 6-10, the bottom case 100 of the present invention includes a first bottom plate 110 and a second bottom plate 120, the first bottom plate 110 is provided with a mounting bar 111, the second bottom plate 120 is provided with a mounting groove 121, the mounting bar 111 can be embedded in the mounting groove 121, so that the first bottom plate 110 is connected to the second bottom plate 120. In one embodiment, the number of the mounting bars 111 is multiple, the mounting bars 111 are arranged at intervals along a first direction, each mounting bar 111 is correspondingly provided with one mounting groove 121, and the first direction is shown as xx' direction in fig. 8.

Specifically, the utility model provides a quantity of mounting bar 111 is 8, and the quantity of mounting groove 121 is 8, every mounting bar 111 homoenergetic inlay establish with a mounting groove 121, when needs are with first bottom plate 110 and second bottom plate 120 erection joint, can in embedding mounting groove 121 with mounting bar 111.

In other embodiments, the number of the mounting bars 111 may be three, four, five, six, etc., as long as the first bottom plate 110 and the second bottom plate 120 can be mounted and connected.

Referring to fig. 1, 2, 4, 6, 9 and 10, a cover 200 according to an embodiment of the present invention includes a first panel 210 and a second panel 220; the first panel 210 is provided with a mounting hole 212, the second panel 220 is embedded in the mounting hole 212, the first panel 210 can be clamped with the bottom case 100, the limiting rib 300 is arranged on a first frame wall of the first panel 210, the buckling position 211 is arranged on a second frame wall of the first panel 210, and the first frame wall and the second frame wall are arranged oppositely and at intervals.

Referring to fig. 6, the surface cover 200 according to an embodiment of the present invention further includes a fastening position 211, the fastening position 211 is located on a side of the surface cover 200 away from the bottom case 100, the fastening position 211 corresponds to the fastening position 211, and the fastening position 211 can be fastened to the fastening groove 124 when the surface cover 200 is closed relative to the bottom case 100.

Specifically, the embodiment of the utility model provides a panel is provided with two and detains position 211, and two are detained the position 211 and are located face lid 200 and end box 100 and rotate the opposite face of one side of being connected, and when the user closed face lid 200 end box 100 relatively, detained position 211 and can the joint in draw-in groove 124, face lid 200 is difficult for opening at end box 100 relatively for waterproof box's waterproof performance is stronger, and the IP grade is higher. When in a bathroom or an outdoor environment with high humidity, the switch 500 is rarely short-circuited and damaged due to contact with water vapor or rain water, so that the risk of electric shock of a user in the using process is extremely low, and the safety of the user in using the switch 500 is improved.

In one embodiment, the fastening position 211 of the panel is located at the side adjacent to the side where the front cover 200 is rotatably connected to the bottom case 100, and the locking slot 124 is located at the side of the second bottom plate 120 corresponding to the fastening position 211. When the front cover 200 is closed relative to the bottom case 100, the fastening portion 211 can be fastened to the fastening slot 124 on the side of the second bottom board 120.

It should be noted that the number of the fastening positions 211 may be one, three, four, or the like, and as long as the fastening positions 211 can be fastened in the fastening slots 124 when the front cover 200 is closed relative to the bottom case 100, so that the front cover 200 is not easily opened relative to the bottom case 100, which is not limited in any way.

Referring to fig. 1, 4, 6, 9 and 10, a concave portion is disposed on one side of the second panel 220 facing the bottom case 100, and the concave portion is recessed from the bottom case 100 to one side of the face cover 200. The second panel 220 is made of transparent soft rubber, and the first panel 210 is connected with the second panel 220 in a sealing way; the first base plate 110 is made of soft plastic, and the first base plate 110 can be hermetically connected with the wall surface 400 outside the switch 500.

Specifically, the first panel 210 and the second panel 220 provided by the embodiment of the present invention are hermetically connected, the second panel 220 is designed in an arc shape, the arc-shaped circle center of the second panel 220 is located at one side of the bottom case 100, the second panel 220 is not easy to be sunk toward one side of the switch 500, and the space between the switch 500 and the second panel 220 is larger, so that the user can use the switch more conveniently; and because second panel 220 is the arch of arc design, steam is difficult for gathering on second panel 220's surface, prevents that fine damaged condition from appearing when the flexible glue under, steam is inside through damaged local infiltration switch 500 for the user takes place to electrocute danger.

Specifically, the embodiment of the utility model provides a second panel 220 is transparent flexible glue, and the user can select to open face lid 200 and open or close the operation method of switch 500, also can select not to open face lid 200, and direct operation method through opening or close switch 500 in the top of second panel 220 not only makes the user use more convenient. When the user's hand is stained with water drops, the user can open or close the switch 500 by not opening the front cover 200, which makes the switch 500 safer to use.

Specifically, the embodiment of the utility model provides a first bottom plate 110 adopts the flexible glue to make, and first bottom plate 110 can be with the wall 400 sealing connection in the switch 500 outside, and the bottom box 100 is stronger with the sealing nature of being connected of wall 400, and steam is difficult for getting into in the bottom box 100 inside and invading switch 500 for user's application safety factor is higher.

Referring to fig. 1, 4, 6, 9 and 10, in an embodiment of the present invention, the length of the second panel 220 is greater than 86mm, and the width of the second panel 220 is greater than 86 mm.

It should be noted that, because the most commonly used switch 500 in the market is 86 type switch 500, 86 type switch 500's overall dimension is 86mm and multiplies 86mm, and the embodiment of the utility model provides a second panel 220 is because length dimension and width dimension all are greater than 86mm, so this waterproof box can be used with 86 frameless switch 500 is supporting for waterproof box's application scope is more extensive.

In one of them embodiment, the embodiment of the utility model provides a waterproof box uses on the socket, and the length dimension and the width dimension of second panel 220 all suit with the size of socket, so this waterproof box can use with the socket is supporting, has further improved waterproof box's application range. The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. A waterproof case, characterized in that it comprises:

the bottom box (100), the bottom box (100) is used for connecting to a wall surface (400), the bottom box (100) is provided with a containing hole (130), and the containing hole (130) is used for containing a switch (500) on the wall surface (400);

the surface cover (200), the surface cover (200) is rotatably connected with one side of the bottom box (100) far away from the wall surface (400);

one end of the limiting rib (300) is connected to the face cover (200), and the other end of the limiting rib (300) is connected to the bottom box (100) in a sliding mode; the bottom box (100) is provided with an abutting part (140), and the limiting rib (300) can abut against the abutting part (140) and is used for limiting the rotation angle of the surface cover (200) relative to the bottom box (100).

2. The waterproof box according to claim 1, characterized in that said abutment portion (140) comprises an arcuate convex surface projecting from said bottom box (100), said arcuate convex surface being located on the side of said bottom box (100) to which said face cover (200) is rotatably attached.

3. The waterproof box according to claim 2, wherein the bottom box (100) is provided with a sliding groove (122) extending in the rotation direction of the face cover (200), and one end of the position-limiting rib (300) slides in the sliding groove (122).

4. The waterproof box of claim 1, wherein the face cover (200) is further provided with a buckling position (211), the buckling position (211) is located on one side, away from the rotating connection with the bottom box (100), of the face cover (200), a clamping groove (124) is arranged on the bottom box (100) corresponding to the buckling position (211), and when the face cover (200) is closed relative to the bottom box (100), the buckling position (211) can be clamped in the clamping groove (124).

5. The waterproof box according to claim 4, characterized in that said face cover (200) comprises a first panel (210) and a second panel (220);

first panel (210) are provided with mounting hole (212), second panel (220) inlay and locate in mounting hole (212), first panel (210) can with end box (100) rotate to be connected, spacing muscle (300) set up in the first frame wall of first panel (210), detain position (211) set up in the second frame wall of first panel (210), first frame wall with the relative and interval arrangement of second frame wall.

6. The waterproof box according to claim 5, characterized in that the side of the second panel (220) facing the bottom box (100) is provided with a recess recessed from the side of the bottom box (100) facing the face cover (200).

7. The waterproof box according to claim 5, characterized in that the bottom box (100) comprises a first bottom plate (110) and a second bottom plate (120), the first bottom plate (110) is provided with a mounting bar (111), the second bottom plate (120) is provided with a mounting groove (121), and the mounting bar (111) can be embedded in the mounting groove (121).

8. The waterproof box according to claim 7, wherein the number of the mounting bars (111) is multiple, the mounting bars (111) are arranged at intervals along a first direction, and each mounting bar (111) is correspondingly provided with one mounting groove (121).

9. The waterproof box of claim 7, wherein the second panel (220) is made of transparent soft glue, and the first panel (210) is connected with the second panel (220) in a sealing way;

and/or the first bottom plate (110) is made of soft rubber, and the first bottom plate (110) can be connected with the wall surface (400) in a sealing mode.

10. The waterproof box according to any one of claims 1 to 9, characterized in that it further comprises a connecting shaft, the bottom box (100) being provided with a first connecting portion (123), the face cover (200) being provided with a second connecting portion (213);

one end of the connecting shaft is rotatably connected to the inner wall of the first connecting part (123), and the other end of the connecting shaft is fixedly connected to the inner wall of the second connecting part (213); and/or one end of the connecting shaft is rotatably connected to the inner wall of the second connecting part (213), and the other end of the connecting shaft is fixedly connected to the inner wall of the first connecting part (123).

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