Building skin structure

Abstract

The present invention relates to the technical field of building skins, and discloses a building skin structure including a frame for enclosing an independent space, a base plate assembly located at the bottom of the frame, an upper cover located at the top of the frame, a skin structure located at the side of the frame, and a passage for entering the independent space, wherein the base plate assembly, the upper cover, and the skin structure are detachably connected to the bottom of the frame, the top of the frame, and the side of the frame, respectively. In this way, an independent space is enclosed by the frame, the base plate assembly, the upper cover, and the skin structure, and placing it in a natural environment or a public environment can provide people with an independent space for activities such as reading, and the frame, the base plate assembly, the upper cover, and the skin structure are all detachable, easy to assemble and disassemble, and flexible to use. Compared with fixed buildings such as houses and shopping malls, it is more suitable for places such as natural environments and public environments, and solves the problem that there is no relatively independent space for people to use in public environments.

Description

Technical Field

[0001] The present invention relates to the technical field of building skins, and more particularly to a building skin structure. Background Art

[0002] In today's society, people are under great pressure and psychological problems are common. Compared with the relatively closed and narrow indoor environment, people are increasingly inclined to relax in the natural environment and public environment, which is a wider environment, and do soothing activities such as reading and taking a nap. However, there is no independent space in such environment, which causes inconvenience. Therefore, how to solve the problem that there is no relatively independent space for people to use in the public environment has become a technical problem that technicians in this field need to solve urgently. Summary of the invention

[0003] The purpose of the present invention is to provide a building skin structure to solve the problem that there is no relatively independent space for people to use in a public environment. The preferred technical solutions among the many technical solutions provided by the present invention can produce many technical effects as described below.

[0004] The present invention provides a building skin structure, comprising a frame for enclosing an independent space, a base plate assembly located at the lower part of the frame, an upper cover located at the top of the frame, a skin structure located at the side of the frame, and a passage for entering the independent space, wherein the base plate assembly, the upper cover and the skin structure are respectively detachably connected to the lower part of the frame, the upper part of the frame and the side of the frame.

[0005] Preferably, the frame includes a plurality of fixing frames detachably connected to the base plate assembly along the circumference of the base plate assembly, and the surface structure includes a plurality of blade groups, the number of the blade groups is the same as the number of the fixing frames and they are arranged one-to-one, and each of the blade groups includes a plurality of blades sequentially connected to the fixing frames along the height direction of the fixing frames.

[0006] Preferably, the fixing frame is provided with a receiving groove extending along the height direction of the fixing frame, and one end of the blade is provided with a connecting protrusion that can extend into the receiving groove. The fixing frame and the connecting protrusion are connected by a rotating connecting shaft, and the blade can rotate relative to the fixing frame around the rotating connecting shaft.

[0007] Preferably, a rope is connected to the blade group, and the rope is used to drive at least one blade in the blade group to rotate relative to the fixed frame. The number of the rope in each blade group is at least 1, and each rope in each blade group is connected to a blade in the corresponding blade group.

[0008] Preferably, a rope threading hole is provided on the connecting protrusion, and the distance between the rope threading hole and the blade is greater than the distance between the rotation axis of the blade and the blade. The rope passes through the rope threading hole and is connected to the corresponding connecting protrusion. When the rope is pulled, the extension and retraction can drive the blade to rotate.

[0009] Preferably, a motor and a rotating wheel are provided on the base plate assembly, the rotating wheel is connected to the output shaft of the motor, the rope is connected to the rotating wheel, and the connection position of the rope and the rotating wheel deviates from the rotation center of the rotating wheel, and the motor drives the rotating wheel to rotate so that the rotating wheel pulls the rope.

[0010] Preferably, when each of the blade groups is provided with a rope, the distances from the connection positions of the ropes corresponding to at least two of the blade groups and the rotating wheel to the rotation center of the rotating wheel are different; when each of the blade groups is provided with at least two ropes, the distances from the connection positions of the two ropes corresponding to each of the blade groups and the rotating wheel to the rotation center of the rotating wheel are different.

[0011] Preferably, it also includes a controller for controlling the start, stop and number of rotations of the motor.

[0012] Preferably, the base plate assembly includes a fixed disk, a fixed ring and a base plate, the fixed frame includes an intermediate rod and a lower connecting rod bent and connected to the lower end of the intermediate rod, the lower connecting rod is provided with a first slot, the fixed frame is plugged into the fixed disk through the first slot, the lower connecting rod is provided with a clamping protrusion at one end away from the intermediate rod, the clamping protrusions on each of the fixed frames form a ring structure, the fixed ring is placed on each of the lower connecting rods, and the fixed ring is in contact with each of the clamping protrusions, and the base plate is arranged on the lower connecting rod.

[0013] Preferably, the fixing frame also includes an upper connecting rod bent and connected to the upper end of the intermediate rod, and along the vertical direction, the height of the upper end surface of the intermediate rod is higher than the height of the upper end surface of the upper connecting rod, so that a protrusion is formed at the upper end of the fixing frame, and the upper cover is placed on each of the upper connecting rods, and the edge of the upper cover is in contact with each of the protrusions.

[0014] In the technical solution provided by the present invention, the building skin structure includes a frame for enclosing an independent space, a base plate assembly located at the bottom of the frame, an upper cover located at the top of the frame, a skin structure located at the side of the frame, and a passage for entering the independent space. The base plate assembly, the upper cover, and the skin structure are detachably connected to the bottom of the frame, the top of the frame, and the side of the frame, respectively. In this way, an independent space is enclosed by the frame, the base plate assembly, the upper cover, and the skin structure. Placing it in a natural environment or a public environment can provide people with an independent space for activities such as reading. Moreover, the frame, the base plate assembly, the upper cover, and the skin structure are all detachable, easy to assemble and disassemble, and flexible to use. Compared with fixed buildings such as houses and shopping malls, it is more suitable for places such as natural environments and public environments, solving the problem that there is no relatively independent space for people to use in public environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 is a structural schematic diagram of a building skin structure in an embodiment of the present invention;

[0017] Figure 2 is an exploded view of the building skin structure in an embodiment of the present invention;

[0018] Figure 3 is a schematic structural diagram of a frame and base plate assembly in an embodiment of the present invention;

[0019] Figure 4 is a schematic structural diagram of a fixing frame and a fixing plate in an embodiment of the present invention;

[0020] Figure 5 is a schematic diagram of the structure of the blade in an unopened state in an embodiment of the present invention;

[0021] Figure 6 is a schematic diagram of the structure of the blades in an open state in an embodiment of the present invention;

[0022] Figure 7 is a schematic diagram of the structure of the blade and the fixing frame in an embodiment of the present invention;

[0023] Figure 8 Schematic diagram of the bottom structure of the building skin structure in an embodiment of the present invention;

[0024] Fig. 9is a schematic diagram of the structure of a fixed disk and a rotating wheel in an embodiment of the present invention;

[0025] Fig.10 is a schematic diagram of the structure of a rotating disk and a rope in an embodiment of the present invention;

[0026] Fig.11 Schematic diagram of the connection structure between the rope and the rotating disk in an embodiment of the present invention.

[0027] Figure 1-11 middle:

[0028] 1. Frame; 2. Upper cover; 3. Surface structure; 4. Through hole; 5. Fixed frame; 501. Accommodating groove; 502. Middle rod; 503. Lower connecting rod; 504. Upper connecting rod; 505. Snap-fit ​​protrusion; 506. Protruding part; 6. Blade; 7. Connecting protrusion; 8. Rope; 9. Rope threading hole; 10. Motor; 11. Rotating wheel; 1101. Rotating disk; 12. Fixed disk; 13. Fixed ring; 14. Bottom plate; 1401. Fan-shaped plate; 15. First slot; 16. Second slot; 17. T-shaped clip; 1701. First part; 1702. Second part; 18. Slot; 1801. First snap-fit ​​part; 1802. Second snap-fit ​​part; 19. Rotating connecting shaft. DETAILED DESCRIPTION

[0029] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0030] The purpose of this specific implementation is to provide a building surface structure to solve the problem that there is no relatively independent space for people to use in a public environment.

[0031] The following is an explanation of the embodiments with reference to the accompanying drawings. In addition, the embodiments shown below do not limit the invention described in the claims. In addition, the entire contents of the configurations shown in the following embodiments are not limited to the solutions required as the invention described in the claims.

[0032] See also Figure 1-11 In this embodiment, if Figure 1As shown, the building skin structure includes a frame 1 for enclosing an independent space, a bottom plate assembly located at the bottom of the frame 1, an upper cover 2 located at the top of the frame 1, a skin structure 3 located at the side of the frame 1, and a through hole 4 for entering the independent space, and the bottom plate assembly, the upper cover 2 and the skin structure 3 are detachably connected to the bottom of the frame 1, the top of the frame 1 and the side of the frame 1. Preferably, a door structure can be provided at the through hole 4 to open and close the through hole 4.

[0033] In this way, an independent space is enclosed by the frame 1, the base assembly, the upper cover 2 and the surface structure 3. Placing it in a natural environment or a public environment can provide people with an independent space for activities such as reading. The frame 1, the base assembly, the upper cover 2 and the surface structure 3 are all detachable, easy to assemble and disassemble, and flexible to use. Compared with fixed buildings such as houses and shopping malls, it is more suitable for natural environments and public environments, solving the problem that there is no relatively independent space for people to use in public environments.

[0034] For example, in most universities, the environment for treating students' psychological problems is just an undesigned indoor environment, which lacks interaction with the natural environment. Through a series of surveys, it is found that the natural environment has a good therapeutic effect on people's hearts. This scheme promotes the connection between the indoor environment and the natural environment through the design of the building's surface structure, which is more conducive to the treatment of psychological problems.

[0035] As an optional implementation, Figure 3 As shown, the frame 1 includes a plurality of fixing frames 5 detachably connected to the bottom plate assembly along the circumference of the bottom plate assembly, and the skin structure 3 includes a plurality of blade groups, the number of the blade groups is the same as the number of the fixing frames 5, and they are arranged one by one, as shown in FIG. Figure 5 and Figure 6 As shown, each blade group includes a plurality of blades 6 connected to the fixing frame 5 in sequence along the height direction of the fixing frame 5. A gap is provided between any two adjacent fixing frames 5.

[0036] As an optional implementation, Figure 7 As shown, the fixing frame 5 is provided with a receiving groove 501 extending in the height direction of the fixing frame 5, and one end of the blade 6 is provided with a connecting protrusion 7 that can extend into the receiving groove 501. The fixing frame 5 and the connecting protrusion 7 are connected by a rotating connecting shaft 19, and the blade 6 can rotate relative to the fixing frame 5 around the rotating connecting shaft 19. The rotating connecting shaft 19 is a bolt. The blade 6 and the fixing frame 5 are both provided with bolt holes for the bolts to pass through.

[0037] With such arrangement, the blade 6 and the fixing frame 5 are connected by bolts, which facilitates the disassembly and assembly of the two, and enables the blade 6 to be flipped on the fixing frame 5 to adjust the light transmission, ventilation and other properties of the overall building skin structure and adjust the degree of contact with the external nature.

[0038] In this scheme, if Figure 7 As shown, a rope 8 is connected to the blade group, and the rope 8 is used to drive at least one blade 6 in the blade group to rotate relative to the fixed frame 5. The number of ropes 8 in the blade group is at least one, and each rope 8 in each blade group is connected to a blade 6 in the corresponding blade group. That is, when the number of ropes 8 in the blade group is one, the rope 8 is connected to at least one blade 6 in the blade group; or, when the number of ropes 8 in the blade group is at least two, each rope 8 is respectively connected to at least one blade 6 in the corresponding blade group.

[0039] Specifically, in this solution, when the number of ropes 8 corresponding to each blade group is 1, the rope 8 is connected to each blade 6 on the corresponding blade group. In this way, pulling the rope 8 can drive all blades 6 on the corresponding blade group to open synchronously at the same angle, such as Figure 5 and Figure 6 As shown; when the number of ropes 8 corresponding to the blade group is at least two, it is possible but not limited to connecting one of the ropes 8 to the upper blades 6 in the corresponding blade group, and connecting the other rope 8 to the lower blades 6 in the corresponding blade group, so that the building skin structure can control the ropes 8 to make the blades 6 in the skin structure 3 unfold at different levels.

[0040] With such arrangement, the blades 6 can be opened to a certain angle by pulling the rope 8. The structure is simple and the operation is convenient. The opening angle of the blades 6 will be different depending on the length of the rope 8 pulled down. That is, the opening angle of the blades 6 can be adjusted by controlling the pulling-down angle of the rope 8.

[0041] As an optional implementation, Figure 7 As shown, a rope threading hole 9 is provided on the connecting protrusion 7, and the distance between the rope threading hole 9 and the blade 6 is greater than the distance between the rotation axis of the blade 6 and the blade 6. The rope 8 passes through the rope threading hole 9 and is connected to the corresponding connecting protrusion 7, so that when the rope 8 is pulled, the extension and contraction can drive the blade 6 to rotate. The rotation axis of the blade 6 is consistent with the axis of the rotating connecting shaft. The rope 8 is connected to the corresponding connecting protrusion 7 by tying a knot on the connecting protrusion 7.

[0042] In this way, since the distance between the rope threading hole 9 and the blade 6 is greater than the distance between the rotation axis of the connecting protrusion 7 and the blade 6, Figure 6 As shown, after the rope 8 is pulled, the end of the blade 6 away from the rotation axis will be tilted, thereby realizing the rotation and opening of the blade 6.

[0043] As an optional implementation, Figure 8-Figure 10As shown, a motor 10 and a rotating wheel 11 are provided on the bottom plate assembly, the rotating wheel 11 is connected to the output shaft of the motor 10, the rope 8 is connected to the rotating wheel 11, and the connection position of the rope 8 and the rotating wheel 11 deviates from the rotation center of the rotating wheel 11, the motor 10 drives the rotating wheel 11 to rotate, so that the rotating wheel 11 pulls the rope 8. In this solution, the rope 8 is connected to the edge of the rotating wheel 11.

[0044] like Fig.10 and Fig.11 As shown, the rope 8 is clamped on the fixed plate 12. Specifically, a T-shaped clamp 17 is provided at the end of the rope 8. The T-shaped clamp 17 includes a first part 1701 and a second part 1702 that are vertically connected. A clamping groove 18 is provided on the rotating wheel 11. The clamping groove 18 includes a first clamping portion 1801 and a second clamping portion 1802. The first clamping portion 1801 and the second clamping portion 1802 are both hollow structures and are connected. The second clamping portion 1802 is adapted to the second part 1702. The first clamping portion 1801 is set to a step shape and is connected to the first part 1701. The adaptation includes a first step and a second step. The first step is provided with a first opening for the first part 1701 to enter the interior of the first step, and the second step is provided with a second opening for the second part 1702 to enter the interior of the second step. In this way, the first part 1701 is aligned with the first step to place the T-shaped clip 17 into the slot 18, and the first part 1701 of the T-shaped clip 17 is moved to the second step. Since the first part 1701 cannot escape from the slot 18 via the second step, the T-shaped clip 17 and the slot 18 can be connected.

[0045] With such arrangement, the rotating wheel 11 rotates to pull down the rope 8, and the rotating wheel 11 is driven to rotate by the motor 10 to electrically control the rope 8 to be pulled down.

[0046] As an optional embodiment, when each blade group is provided with a corresponding rope 8, the distances from the connection position of the rope 8 and the rotating wheel 11 to the rotation center of the rotating wheel 11 corresponding to at least two blade groups are different, so that when the rotating wheel 11 rotates, the blades 6 on different blade groups can be opened at different angles. When each blade group is provided with at least two ropes 8, the distances from the connection position of each rope 8 and the rotating wheel 11 to the rotation center of the rotating wheel 11 are different, so that when the rotating wheel 11 rotates, the blades 6 in the same blade group can be opened at different angles.

[0047] Specifically, in this solution, Fig. 9 As shown, the rotating wheel 11 includes two rotating disks 1101, the two rotating disks 1101 are coaxially connected to the output shaft of the motor 10, and the radii of the two rotating disks 1101 are different, as shown in FIG. Figure 8As shown, each blade group is provided with a corresponding rope 8, and the two ropes 8 corresponding to any two adjacent blade groups are respectively connected to the edges of two different rotating disks 1101, so that the distances from the connection position of the rope 8 and the rotating wheel 11 to the rotation center of the rotating wheel 11 are different. In other embodiments, the rotating wheel 11 may include a disk body, and different ropes 8 are connected to different positions of the disk body along the radial direction, so that the distances from the connection position of the rope 8 and the rotating wheel 11 to the rotation center of the rotating wheel 11 are different.

[0048] In this arrangement, by connecting the ropes 8 on two adjacent blade groups to the edges of two rotating disks 1101 respectively, the two rotating disks 1101 rotate synchronously to drive two different ropes 8 to be pulled downward by different distances, so that the blades 6 on the two adjacent blade groups open at different angles.

[0049] As an optional implementation, the building skin structure further includes a controller for controlling the start, stop and number of rotations of the motor 10. Optionally, a PLC or a single chip microcomputer can be used as the controller.

[0050] With such arrangement, the motor 10 can be automatically controlled by the controller, and the user can control the opening and closing of the blades 6 and the opening and closing angles inside the building skin structure.

[0051] As an optional implementation, Figure 3 As shown, the base plate assembly includes a fixing plate 12, a fixing ring 13 and a base plate 14. Figure 4 As shown, the fixing frame 5 includes an intermediate rod 502 and a lower connecting rod 503 bent and connected to the lower end of the intermediate rod 502. The lower connecting rod 503 is provided with a first slot 15, and the fixing frame 5 is plugged into the fixing plate 12 through the first slot 15. The lower connecting rod 503 is provided with a clamping protrusion 505 at one end away from the intermediate rod 502. The clamping protrusions 505 on each fixing frame 5 form a ring structure. The fixing ring 13 is placed on each lower connecting rod 503, and the fixing ring 13 contacts each clamping protrusion 505. The bottom plate 14 is arranged on the lower connecting rod 503. The bottom plate 14 is composed of a plurality of fan-shaped plates 1401 spliced ​​together.

[0052] Specifically, in this solution, there is a gap between the two fixing frames 5 to form a through hole 4. The fixing plate 12 is provided with a second slot 16, and the lower connecting rod 503 is inserted into the fixing plate 12 along the second slot 16. In this way, the first slot 15 cooperates with the fixing plate 12, and the second slot 16 cooperates with the lower connecting rod 503, thereby enhancing the plugging stability and safety of the fixing plate 12 and the fixing frame 5. In other embodiments, the fixing frame 5 and the fixing plate 12, the fixing ring 13 and the fixing frame 5, and the bottom plate 14 and the fixing frame 5 can all be connected by bolts to achieve double fastening connection, thereby enhancing the connection reliability.

[0053] With such arrangement, the fixing plate 12 and the frame 1 are detachably connected through the plug-in structure, the structure is simple, and the installation and removal process is convenient and quick.

[0054] As an optional implementation, Figure 4 As shown, the fixing frame 5 also includes an upper connecting rod 504 bent and connected to the upper end of the middle rod 502. In the vertical direction, the height of the upper end surface of the middle rod 502 is higher than the height of the upper connecting rod 504, so that a protrusion 506 is formed on the upper end of the fixing frame 5. The upper cover 2 is placed on each upper connecting rod 504, and the edge of the upper cover 2 is in contact with each protrusion 506. In this solution, the upper cover 2 is an acrylic cover. In other embodiments, the upper connecting rod 504 and the upper cover 2 can be connected by bolts to achieve a double fastening connection to enhance the connection reliability; a sealing gasket can be added between the upper cover 2 and the protrusion 506.

[0055] With such arrangement, the upper cover 2 can be directly placed on the upper connecting rod 504, which is convenient for installation and disassembly.

[0056] It is understood that the same or similar parts in the above embodiments can refer to each other, and the content not described in detail in some embodiments can refer to the same or similar content in other embodiments. The multiple solutions provided by the present invention include the basic solution itself, which are independent of each other and do not restrict each other, but they can also be combined with each other without conflict to achieve multiple effects together.

[0057] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A building skin structure, characterized in that: include: A frame (1) for enclosing an independent space, a bottom plate assembly located at the bottom of the frame (1), an upper cover (2) located at the top of the frame (1), a skin structure (3) located at the side of the frame (1), and a through opening (4) for entering the independent space, wherein the bottom plate assembly, the upper cover (2) and the skin structure (3) are detachably connected to the bottom of the frame (1), the top of the frame (1) and the side of the frame (1), respectively; The frame (1) comprises a plurality of fixing frames (5) detachably connected to the base plate assembly along the circumference of the base plate assembly, the surface structure (3) comprises a plurality of blade groups, the number of the blade groups is the same as the number of the fixing frames (5) and they are arranged in a one-to-one correspondence, and each of the blade groups comprises a plurality of blades (6) sequentially connected to the fixing frames (5) along the height direction of the fixing frames (5); The fixing frame (5) is provided with a receiving groove (501) extending in the height direction of the fixing frame (5); one end of the blade (6) is provided with a connecting protrusion (7) capable of extending into the receiving groove (501); the fixing frame (5) and the connecting protrusion (7) are connected via a rotating connecting shaft (19); and the blade (6) is capable of rotating relative to the fixing frame (5) around the rotating connecting shaft (19); The blade group is connected to a rope (8), the rope (8) being used to drive at least one blade (6) in the blade group to rotate relative to the fixing frame (5), the number of the rope (8) in each blade group is at least one, and each rope (8) in each blade group is connected to one blade (6) in the corresponding blade group; The base plate assembly comprises a fixing plate (12), a fixing ring (13) and a base plate (14); the fixing frame (5) comprises an intermediate rod (502) and a lower connecting rod (503) bent and connected to the lower end of the intermediate rod (502); a first slot (15) is provided on the lower connecting rod (503); the fixing frame (5) is plugged into the fixing plate (12) via the first slot (15); a clamping protrusion (505) is provided at one end of the lower connecting rod (503) away from the intermediate rod (502); the clamping protrusions (505) on each of the fixing frames (5) form a ring-shaped structure; the fixing ring (13) is placed on each of the lower connecting rods (503), and the fixing ring (13) is in contact with each of the clamping protrusions (505); and the base plate (14) is arranged on the lower connecting rod (503).

2. The building skin structure according to claim 1, characterized in that: The connecting protrusion (7) is provided with a rope threading hole (9), the distance between the rope threading hole (9) and the blade (6) is greater than the distance between the rotation axis of the blade (6) and the blade (6), the rope (8) passes through the rope threading hole (9) and is connected to the corresponding connecting protrusion (7), and when the rope (8) is pulled, the rope (8) can drive the blade (6) to rotate.

3. The building skin structure according to claim 1, characterized in that: The base plate assembly is provided with a motor (10) and a rotating wheel (11); the rotating wheel (11) is connected to the output shaft of the motor (10); the rope (8) is connected to the rotating wheel (11); and the connection position between the rope (8) and the rotating wheel (11) deviates from the rotation center of the rotating wheel (11); the motor (10) drives the rotating wheel (11) to rotate, so that the rotating wheel (11) pulls the rope (8).

4. The building skin structure according to claim 3, characterized in that: When each blade group is provided with a corresponding rope (8), the distances from the connection positions of the ropes (8) and the rotating wheel (11) corresponding to at least two blade groups to the rotation center of the rotating wheel (11) are different; when each blade group is provided with at least two ropes (8), the distances from the connection positions of the two ropes (8) and the rotating wheel (11) corresponding to each blade group to the rotation center of the rotating wheel (11) are different.

5. The building skin structure according to claim 3, characterized in that: It also includes a controller for controlling the start, stop and number of rotations of the motor (10).

6. The building skin structure according to claim 1, characterized in that: The fixing frame (5) further comprises an upper connecting rod (504) bent and connected to the upper end of the intermediate rod (502); along the vertical direction, the height of the upper end surface of the intermediate rod (502) is higher than the height of the upper end surface of the upper connecting rod (504), so that a protrusion (506) is formed at the upper end of the fixing frame (5); the upper cover (2) is placed on each of the upper connecting rods (504), and the edge of the upper cover (2) is in contact with each of the protrusions (506).

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