A concealed seamless rotational joint for folding a house column midsection

Abstract

The application belongs to the technical field of building steel structure, and particularly discloses a hidden seamless rotating joint for the middle part of a folding house column. The hidden seamless rotating joint for the folding house column is used to connect two bending sections with an upper folding piece and a lower folding piece respectively, so that the upper folding piece and the lower folding piece rotate respectively. When the upper folding piece and the lower folding piece are in a first state, the two bending sections of the connecting piece are located inside the upper folding piece and the lower folding piece respectively, and thus the rotation of the upper folding piece and the lower folding piece is not affected. When the upper folding piece and the lower folding piece are in a second state, the two bending sections of the connecting piece are connected, and thus a part of the connecting piece is located outside the upper folding piece and the lower folding piece. Even if the connecting piece is subjected to a collision, the connecting piece is the force receiving piece, and the phenomenon that the rotating joint is subjected to a collision and causes the upper folding piece and the lower folding piece to separate from each other does not occur, and the practicability of the rotating joint is improved.

Description

Technical Field

[0001] This invention relates to the field of building steel structure technology, specifically to an implicit seamless rotating joint for the middle of the central column of a folding house. Background Technology

[0002] With the development of industrialized construction, container houses have achieved standardized, modular, universal, serialized, and factory-produced status through more than a decade of technological and product innovation, becoming environmentally friendly, efficient, and economical industrialized products.

[0003] Folding container houses offer low storage and transportation costs, simple on-site installation and disassembly, and high turnover rates, making them a promising future direction for temporary housing. Existing folding container houses typically utilize the top and bottom steel beams of the wall as primary load-bearing components at the rotation nodes where the central column is located. They also include a first connector, a second connector, an upper folding component, a lower folding component, and multiple rotating shafts. Specifically, at least one rotating shaft is provided at the rotation points of the first connector and the upper folding component, the upper folding component and the lower folding component, and the lower folding component and the second connector, thus connecting the first connector, the second connector, and the folding assembly. This prevents the upper and lower folding components from detaching. Simultaneously, at the rotation points of the upper and lower folding components, each component has an internal cavity communicating with the outside. Furthermore, the upper and lower folding components are spaced apart along their height to facilitate rotation and folding.

[0004] However, since the internal cavities of the rotating parts of the upper and lower folding components are connected to the outside, and the upper and lower folding components are spaced apart along the height direction, the rotating nodes will be exposed after folding. This makes the upper and lower folding components susceptible to separation due to external impacts, which makes the rotating nodes not meet the requirements of load-bearing safety and durability, resulting in insufficient practicality of the rotating nodes. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is that in the prior art, due to the rotation node formed by the upper folding member and the lower folding member, the rotation node will be exposed after folding, and it is easily separated by external factors such as collisions, resulting in insufficient practicality of the rotation node.

[0006] Therefore, the present invention provides an implicit seamless rotating joint for a central column in a folding room, comprising:

[0007] A central column assembly, comprising an upper folding member and a lower folding member, wherein the upper folding member and the lower folding member are spaced apart, the upper folding member having a first receiving cavity with an opening on one side, and the lower folding member having a second receiving cavity with an opening on one side, wherein the openings of the first receiving cavity and the openings of the second receiving cavity are arranged close to each other.

[0008] The connector includes two connected bent sections, one of which is located inside the first receiving cavity and rotatably connected to the upper folding member, and the other bent section is located inside the second receiving cavity and rotatably connected to the lower folding member.

[0009] The upper folding member and the lower folding member have a first state in which the ends of the upper folding member away from the lower folding member and the ends of the lower folding member away from the upper folding member are close to each other until the two ends are spaced apart. The upper folding member and the lower folding member have a second state in which the ends of the upper folding member away from the lower folding member and the ends of the lower folding member away from the upper folding member are far apart to each other until the two ends are collinear. The upper folding member and the lower folding member are switched between the first state and the second state.

[0010] Optionally, the aforementioned implicit seamless rotation node for the central column of a folding room,

[0011] The connector has an arc-shaped structure and includes a first bent section and a second bent section. The end of the first bent section near the second bent section is connected to the second bent section, and the end of the first bent section away from the second bent section is spaced apart from the end of the second bent section away from the first bent section.

[0012] Optionally, the aforementioned implicit seamless rotation node for the central column of a folding room,

[0013] The first bending segment has a first end and a second end, the second bending segment has a third end and a fourth end, the first end is rotatably connected to the upper folding member, the third end is connected to the second end, the fourth end is rotatably connected to the lower folding member, and the fourth end is spaced apart from the first end.

[0014] Optionally, the aforementioned implicit seamless rotation node for the central column of a folding room,

[0015] The pin has two pins, one of which passes through the upper folding member and the first end, and the other pin passes through the lower folding member and the fourth end.

[0016] Optionally, the aforementioned implicit seamless rotation node for the central column of a folding room,

[0017] It also includes an upper end plate, a lower end plate, and a locking member. The upper end plate is installed at the opening of the first receiving cavity, and the lower end plate is installed at the opening of the second receiving cavity. Each end plate is provided with a mounting hole. The mounting hole of the upper end plate and the mounting hole of the lower end plate are coaxially arranged. The locking member passes through the mounting holes of the upper end plate and the lower end plate to connect the upper end plate and the lower end plate.

[0018] Optionally, the aforementioned implicit seamless rotation node for the central column of a folding room,

[0019] The upper end plate is provided with an upper tongue-and-groove joint;

[0020] The lower end plate is provided with a lower tongue, which is located below the upper tongue along the height direction.

[0021] Optionally, the aforementioned implicit seamless rotation node for the central column of a folding room,

[0022] Each end plate is provided with a receiving hole, and the receiving hole of the upper end plate communicates with the receiving hole of the lower end plate along the height direction to accommodate the connector.

[0023] Optionally, the aforementioned implicit seamless rotation node for the central column of a folding room,

[0024] The upper end plate has a first limiting surface on the side near the lower end plate, and the lower end plate has a second limiting surface on the side near the upper end plate. The first limiting surface and the second limiting surface are parallel and spaced apart to form a third receiving cavity.

[0025] It also includes a seal, which is located in a third receiving cavity when the upper fold and the lower fold are in the second state.

[0026] Optionally, the aforementioned implicit seamless rotation node for the central column of a folding room,

[0027] It also includes reinforcement components, of which there are two, one of which is located inside the first receiving cavity and the other is located inside the second receiving cavity.

[0028] Optionally, the aforementioned implicit seamless rotation node for the central column of a folding room,

[0029] Both the upper folding member and the lower folding member are provided with mounting grooves, and the two mounting grooves are connected to allow the first and second receiving cavities to communicate with the outside in the second state.

[0030] The technical solution provided by this invention has the following advantages:

[0031] The present invention provides an implicit seamless rotating node for a central column of a folding room, comprising a central column assembly and a connector. Specifically, the central column assembly includes an upper folding member and a lower folding member, which are spaced apart. The upper folding member has a first receiving cavity with one side open, and the lower folding member has a second receiving cavity with one side open. The openings of the first and second receiving cavities are arranged close to each other. The connector includes two connected bent sections, one of which is located inside the first receiving cavity and rotatably connected to the upper folding member, and the other of which is located inside the second receiving cavity and rotatably connected to the lower folding member. The upper folding member and the lower folding member have a first state in which their ends facing each other and then spaced apart, and a second state in which their ends facing away from each other and then collinear. The upper and lower folding members switch between the first and second states.

[0032] This structure is used for the implicit seamless rotating node of the central column in a folding room. By connecting the two bent sections in the connector to the upper and lower folding parts respectively, the upper and lower folding parts can rotate independently. In the first state, since the two bent sections of the connector are located inside the upper and lower folding parts respectively, the connector is separated from the outside and will not affect the rotation of the upper and lower folding parts. In the second state, since the two bent sections of the connector are connected, part of the connector is located outside the upper and lower folding parts. Even if a collision is about to occur, the force-bearing component is the connector, and there will be no phenomenon of the rotating node being separated from the upper and lower folding parts due to a collision, thus improving the practicality of the rotating node. Attached Figure Description

[0033] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0034] Figure 1 A side view of an implicit seamless rotating node for the central column of a folding room, provided for an embodiment of the present invention;

[0035] Figure 2 A front view of an implicit seamless rotating node for the central column of a folding room, provided as an embodiment of the present invention;

[0036] Figure 3 for Figure 2 A magnified view of part A in the middle;

[0037] Figure 4 A front view of a connector in an implicit seamless rotating node in the middle of a central column of a folding room, provided as an embodiment of the present invention;

[0038] Figure 5 A schematic diagram of the structure of the upper end plate in the implicit seamless rotating node in the middle of the central column of a folding room, provided as an embodiment of the present invention;

[0039] Figure 6 A schematic diagram of the structure of the lower end plate in the implicit seamless rotating node in the middle of the central column of a folding room, provided as an embodiment of the present invention;

[0040] Figure 7 A schematic diagram of a structure provided for an embodiment of the present invention, showing that both the upper and lower folding parts of the implicit seamless rotating node in the middle of the central column of a folding room rotate by 15°.

[0041] Figure 8 A schematic diagram of a structure provided for an embodiment of the present invention, showing that both the upper and lower folding parts of the implicit seamless rotating node in the middle of the central column of a folding room rotate by 30°.

[0042] Figure 9 A schematic diagram of the structure provided in an embodiment of the present invention, showing that both the upper and lower folding parts of the implicit seamless rotating node in the middle of the central column of a folding room rotate by 45°.

[0043] Figure 10 A schematic diagram of the structure provided in an embodiment of the present invention, showing that both the upper and lower folding parts of the implicit seamless rotating node in the middle of the central column of a folding room rotate by 60°.

[0044] Figure 11 A schematic diagram of the structure provided in an embodiment of the present invention, showing that both the upper and lower folding parts of the implicit seamless rotating node in the middle of the central column of a folding room rotate by 90°.

[0045] Explanation of reference numerals in the attached figures:

[0046] 1-Center column assembly; 11-Upper folding component; 12-Lower folding component; 13-Mounting slot;

[0047] 2-Connector; 21-First bending section; 211-First end; 212-Second end; 22-Second bending section; 221-Third end; 222-Fourth end;

[0048] 3-Pin;

[0049] 4-Upper end plate; 411-Upper tongue and groove; 412-Mounting hole; 413-Accommodation hole; 414-First limiting surface;

[0050] 5-Lower end plate; 511-Lower tongue and groove; 512-Second limiting surface;

[0051] 6-Locking component;

[0052] 7-Seals;

[0053] 8-Fixed firmware. Detailed Implementation

[0054] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0055] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0056] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0057] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0058] Example 1

[0059] This embodiment provides an implicit seamless rotating node for the central column of a folding room, such as... Figures 1 to 11As shown, it includes a central column assembly 1 and a connector 2. Specifically, the central column assembly 1 includes an upper folding member 11 and a lower folding member 12, which are spaced apart. The upper folding member 11 has a first receiving cavity with one side open, and the lower folding member 12 has a second receiving cavity with one side open. The openings of the first and second receiving cavities are arranged close to each other. The connecting member 2 includes two connected bent sections. One bent section is located inside the first receiving cavity and is rotatably connected to the upper folding member 11, and the other bent section is located inside the second receiving cavity and is rotatably connected to the lower folding member 12. The upper folding member 11 and the lower folding member 12 have a first state in which the ends away from the lower folding member 12 are close to each other until they are spaced apart. The upper folding member 11 and the lower folding member 12 have a second state in which they are far apart from each other until they are collinear. The upper folding member 11 and the lower folding member 12 are switched between the first and second states.

[0060] The aforementioned implicit seamless rotating node for the central column of a folding room allows the upper folding member 11 and the lower folding member 12 to rotate independently by connecting the two bent segments of the connector 2 to the upper folding member 11 and the lower folding member 12 respectively. In the first state, since the two bent segments of the connector 2 are located inside the upper folding member 11 and the lower folding member 12 respectively, the connector 2 is separated from the outside and will not affect the rotation of the upper folding member 11 and the lower folding member 12. In the second state, since the two bent segments of the connector 2 are connected, a portion of the connector 2 will be located outside the upper folding member 11 and the lower folding member 12. Even if a collision occurs, the force-bearing component is the connector 2, and the rotating node will not be affected by a collision, causing the upper folding member 11 and the lower folding member 12 to separate, thus improving the practicality of the rotating node.

[0061] It can be noted that the implicit seamless rotating node for the central column of the folding room provided in this embodiment does not limit the structure of the connector 2, only requiring that the connector 2 has two bending sections.

[0062] In one embodiment, the connector 2 is made into an arc-shaped structure, such as a C-shaped structure. In this case, the connector 2 includes a first bent section 21 and a second bent section 22. The end of the first bent section 21 near the second bent section 22 is connected to the second bent section 22, and the end of the first bent section 21 away from the second bent section 22 is spaced apart from the end of the second bent section 22 away from the first bent section 21.

[0063] Furthermore, in this embodiment, the first bending segment 21 has a first end 211 and a second end 212, and the second bending segment 22 has a third end 221 and a fourth end 222. The first end 211 is rotatably connected to the upper folding member 11, the third end 221 is connected to the second end 212, the fourth end 222 is rotatably connected to the lower folding member 12, and the fourth end 222 is spaced apart from the first end 211.

[0064] It can be noted that, in order to facilitate the rotation of the upper folding member 11 and the lower folding member 12, the implicit seamless rotating node for the central column of the folding room provided in this embodiment is also provided with a pin 3. At this time, there are two pins 3, one of which passes through the upper folding member 11 and the first end 211, and the other pin 3 passes through the lower folding member 12 and the fourth end 222.

[0065] like Figures 1 to 11 As shown, the implicit seamless rotating node for the central column of the folding room provided in this embodiment also includes an upper end plate 4, a lower end plate 5, and a locking member 6. The upper end plate 4 is installed at the opening of the first receiving cavity, and the lower end plate 5 is installed at the opening of the second receiving cavity. Each end plate is provided with a mounting hole 412. The mounting hole 412 of the upper end plate 4 and the mounting hole 412 of the lower end plate 5 are coaxially arranged. The locking member 6 passes through the mounting hole 412 of the upper end plate 4 and the mounting hole 412 of the lower end plate 5 to connect the upper end plate 4 and the lower end plate 5.

[0066] It can be noted that the implicit seamless rotating joint for the central column of the folding room provided in this embodiment does not limit the selection of the locking member 6. As one implementation method, the locking member 6 is selected as a high-strength bolt. In this case, after the bolt passes through the mounting holes 412 of the upper end plate 4 and the lower end plate 5, a nut is used to complete the threaded connection. This allows the upper end plate 4 and the lower end plate 5 to be clamped with a high-strength bolt and nut, ensuring the stress performance of the upper folding member 11 and the lower folding member 12 in the second state, thereby improving the stability of the rotating joint.

[0067] It can be noted that, in order to improve the waterproof performance of the upper folding member 11 and the lower folding member 12, the implicit seamless rotating node for the central column of the folding room provided in this embodiment is provided with an upper tongue 411 on the upper end plate 4 and a lower tongue 511 on the lower end plate 5, with the lower tongue 511 located below the upper tongue 411 along the height direction.

[0068] It can be explained that, in order to avoid the upper end plate 4 and the lower end plate 5 from hindering the rotation between the upper folding member 11 and the lower folding member 12, the implicit seamless rotation node for the central column of the folding room provided in this embodiment should have a receiving hole 413 on each end plate. The receiving hole 413 of the upper end plate 4 is connected to the receiving hole 413 of the lower end plate 5 along the height direction to accommodate the connecting member 2.

[0069] Furthermore, the implicit seamless rotating joint for the central column of the folding room provided in this embodiment does not limit the number or position of the receiving hole 413 and the mounting hole 412. As one implementation method, such as... Figure 5 and Figure 6 As shown, there are two receiving holes 413 and two mounting holes 412. At this time, the two mounting holes 412 are spaced apart, and the two receiving holes 413 are located between the two mounting holes 412.

[0070] It can be noted that, in order to further improve the waterproof performance of the upper folding member 11 and the lower folding member 12, the implicit seamless rotating node for the central column of the folding room provided in this embodiment has a first limiting surface 414 on the side of the upper end plate 4 near the lower end plate 5, and a second limiting surface 512 on the side of the lower end plate 5 near the upper end plate 4. The first limiting surface 414 and the second limiting surface 512 are parallel and spaced apart to form a third receiving cavity; it also includes a sealing member 7. When the upper folding member 11 and the lower folding member 12 are in the second state, the sealing member 7 is located in the third receiving cavity, and at the same time, it can also play a certain role in sound insulation.

[0071] Furthermore, the implicit seamless rotating joint for the central column of the folding room provided in this embodiment does not limit the selection of the sealing element 7. As one implementation, the sealing element 7 is selected as a sealing strip, and the sealing element 7 is adhered to either the first limiting surface 414 or the second limiting surface 512.

[0072] like Figures 1 to 11 As shown, the implicit seamless rotating node for the central column of the folding room provided in this embodiment also includes a reinforcing member 8 to increase the strength of the upper folding member 11 and the lower folding member 12. There are two reinforcing members 8, one located inside the first receiving cavity and the other located inside the second receiving cavity.

[0073] like Figures 1 to 11 As shown, the implicit seamless rotating joint for the central column of a folding room provided in this embodiment does not limit the size of the connector 2. Figure 2 For example, if the horizontal dimension of connector 2 is small, connector 2, upper folding part 11, and lower folding part 12 can be installed directly. If the horizontal dimension of connector 2 is large, mounting slots 13 should be provided on both upper folding part 11 and lower folding part 12. In this case, the two mounting slots 13 are connected so that the first and second receiving cavities are connected to the outside in the second state. This can ensure that upper folding part 11 and lower folding part 12 avoid connector 2 during rotation. At the same time, it can also make the rotation node formed after connector 2 is connected to upper folding part 11 and lower folding part 12 more concealed and aesthetically pleasing, and facilitate the operator to install connector 2, upper folding part 11, and lower folding part 12 through mounting slots 13.

[0074] It can be noted that the implicit seamless rotating node for the central column of the folding room provided in this embodiment, when the upper folding member 11 and the lower folding member 12 rotate 15° respectively, is as follows: Figure 7 As shown, when the upper folding member 11 and the lower folding member 12 are rotated 30° respectively, as Figure 8 As shown, when the upper folding member 11 and the lower folding member 12 are rotated 45° respectively, as Figure 9 As shown, when the upper folding member 11 and the lower folding member 12 are rotated 60° respectively, as Figure 10 As shown, when the upper folding member 11 and the lower folding member 12 rotate 90° respectively, as Figure 11 As shown.

[0075] Of course, to improve the vibration damping capability of the rotating joint, the implicit seamless rotating joint for the central column of a folding room provided in this embodiment also includes vibration damping components, such as sponge. Figure 2 Taking the shown perspective as an example, the shock absorber is positioned vertically between the upper folding member 11 and the lower folding member 12.

[0076] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A concealed seamless rotational joint for folding a house column, characterized in that, The utility model relates to a kind of center pillar assemblies, including: Center pillar assembly (1), the center pillar assembly (1) includes upper folding piece (11) and lower folding piece (12), the upper folding piece (11) is spaced apart with the lower folding piece (12), the inside of the upper folding piece (11) is equipped with the first accommodating cavity with one side open, the inside of the lower folding piece (12) is equipped with the second accommodating cavity with one side open, the opening of first accommodating cavity and the opening of second accommodating cavity are close to each other and are arranged; Connecting piece (2), the connecting piece (2) includes two connected bending sections, one bending section is located in the first accommodating cavity and is rotatably connected with the upper folding piece (11), the other bending section is located in the second accommodating cavity and is rotatably connected with the lower folding piece (12); Upper end plate (4), the upper end plate (4) is installed at the opening of the first accommodating cavity; Lower end plate (5), the lower end plate (5) is installed at the opening of the second accommodating cavity; Wherein, the side end of the upper folding piece (11) away from the lower folding piece (12) and the side end of the lower folding piece (12) away from the upper folding piece (11) have the first state of close to each other and being spaced apart until two end portions, the side end of the upper folding piece (11) away from the lower folding piece (12) and the side end of the lower folding piece (12) away from the upper folding piece (11) have the second state of away from each other and being arranged in line until two end portions are arranged in line;The upper folding piece (11) and the lower folding piece (12) are switched between the first state and the second state; The connecting piece (2) is arc-shaped structure, the connecting piece (2) includes first bending section (21) and second bending section (22), the first bending section (21) is connected with the second bending section (22) close to one end of the second bending section (22), the first bending section (21) is spaced apart from one end of the second bending section (22) away from the first bending section (21); The first bending section (21) has first end (211) and second end (212), the second bending section (22) has third end (221) and fourth end (222), the first end (211) is rotatably connected with the upper folding piece (11), the third end (221) and the second end (212) are connected, the fourth end (222) is rotatably connected with the lower folding piece (12), and the fourth end (222) is spaced apart from the first end (211); Each end plate is provided with accommodating hole (413), the accommodating hole (413) of the upper end plate (4) is communicated with the accommodating hole (413) of the lower end plate (5) along the height direction to accommodate the connecting piece (2); The side of the upper end plate (4) close to the lower end plate (5) is provided with first limit surface (414), the side of the lower end plate (5) close to the upper end plate (4) is provided with second limit surface (512), and the first limit surface (414) and the second limit surface (512) are parallel and spaced apart to form third accommodating cavity; The implicit seamless rotating joint for folding the house column further comprises a sealing member (7), which is located in the third accommodating cavity when the upper folding member (11) and the lower folding member (12) are in the second state.

2. The implicit seamless rotation joint for folding a house post according to claim 1, wherein, Further comprising: Pin shafts (3) are provided with two, one of which is arranged through the upper folding member (11) and the first end (211), and the other is arranged through the lower folding member (12) and the fourth end (222).

3. The implicit seamless rotating joint for folding the house column according to claim 1 or 2, characterized in that Further comprising a locking member (6), any end plate is provided with a mounting hole (412), the mounting hole (412) of the upper end plate (4) is coaxially arranged with the mounting hole (412) of the lower end plate (5), and the locking member (6) is arranged through the mounting hole (412) of the upper end plate (4) and the mounting hole (412) of the lower end plate (5) to connect the upper end plate (4) and the lower end plate (5).

4. The implicit seamless rotating joint for folding the house column according to claim 3, characterized in that The upper end plate (4) is provided with an upper tongue groove (411); The lower end plate (5) is provided with a lower tongue groove (511), which is located below the upper tongue groove (411) along the height direction.

5. The implicit seamless rotating joint for folding the house column according to claim 1 or 2, characterized in that Further comprising reinforcing members (8), which are provided with two, one of which is located inside the first accommodating cavity, and the other is located inside the second accommodating cavity.

6. The implicit seamless rotating joint for folding the house column according to claim 1 or 2, characterized in that The upper folding member (11) and the lower folding member (12) are both provided with mounting grooves (13), and the two mounting grooves (13) are communicated to make the first accommodating cavity and the second accommodating cavity communicated with the outside in the second state.

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