Small anti-theft garage

Abstract

The small anti-theft garage comprises a chassis, a fixed shell and a movable shell, the fixed shell and the movable shell are arranged above the chassis, the fixed shell is fixedly connected to the front side of the chassis, and the movable shell is movably connected to the rear side of the chassis and used for opening or closing the garage. The device is characterized in that the movable shell is rotationally connected with the chassis through a pivot structure so as to be matched with overturning of the movable shell; wherein the pivot structure is located at the front part of the movable shell. The movable shell turns over with the pivot structure as the axis so that the garage can be opened or closed, the gravity center of the movable shell in the turning-over process is low, and stability is good. And the change of the gravity center height in the overturning process is small, so that energy can be saved.

Description

Technical Field

[0001] The utility model relates to the field of garages, in particular to a small anti-theft garage. Background Art

[0002] Motorcycle garages are generally dedicated storage spaces designed for high-end motorcycles. They usually have functions such as anti-theft, fire prevention, protection against wind and sand, high temperature resistance, and low temperature resistance. These garages can be divided into two types: traditional garages and mobile garages. Among them, traditional garages are similar to car garages and are constructed of brick and concrete; while mobile garages have the characteristics of being transportable and are more flexible and convenient.

[0003] A Chinese utility model patent with the application number 201920923697.8 discloses a safe anti-theft garage, which includes a bottom plate. A quarter-cylindrical lower door body is fixed on the top of the bottom plate. The top of the lower door body is hinged with a quarter-cylindrical upper door body through a hinge. A mechanical door lock is installed between the upper door body and the lower door body. An electric control lock is installed between the upper door body and the lower door body. A lifting mechanism is installed between the upper door body and the lower door body. Water-flowing lights are installed on the sides of both the upper door body and the lower door body. A chute is opened on the top of the bottom plate. Rubber pads are fixed on the right-angled sides of the upper door body. A corner protector is provided at the right angle of the upper door body. A total control panel is installed inside the lower door body.

[0004] Therefore, the structure of the above safe anti-theft garage still has the following problems: when the safe anti-theft garage is opened, the upper door body needs to be flipped around the uppermost edge of the opening of the lower door body. Eventually, the center of gravity of the upper door body is much higher than that of the lower door body. After the upper door body is opened, the overall stability of the garage structure is poor; secondly, during the opening process of the upper door body, a large amount of energy is required to drive the upper door body to flip, wasting energy. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a small anti-theft garage with higher stability and energy saving after being opened in view of the above-mentioned current situation of the prior art.

[0006] The technical solution adopted by the utility model to solve the above technical problems is as follows: a small anti-theft garage includes a chassis, a fixed housing and a movable housing respectively arranged above the chassis. The fixed housing is fixedly connected to the front side of the chassis. The movable housing is movably connected to the rear side of the chassis and is used to open or close the garage. It is characterized in that: the movable housing is rotationally connected to the chassis through a pivot structure to cooperate with the flipping of the movable housing; wherein, the pivot structure is located at the front of the movable housing. The movable housing can be flipped around the pivot structure as the axis to open or close the garage.

[0007] Preferably, the chassis is provided with a rotating shaft arranged along the left-right direction of the garage, and a rotating shaft hole is provided below the moving shell body for the rotating shaft to penetrate and cooperate with the turning of the moving shell body; wherein the rotating shaft and the rotating shaft hole together constitute the pivot structure.

[0008] Preferably, the rotating shaft comprises a left rotating shaft arranged on the left side of the chassis and a right rotating shaft arranged on the right side of the chassis, and the left rotating shaft and the right rotating shaft are arranged in a colinear manner. Separating the rotating shaft into a left rotating shaft and a right rotating shaft avoids the rotating shaft from occupying the parking space inside the garage, and also reduces the difficulty of assembling the moving housing and the chassis.

[0009] Preferably, a left connecting hole for the rotating shaft to pass through is provided on the left side wall of the moving housing, and a right connecting hole for the rotating shaft to pass through is provided on the right side wall of the moving housing, and the left connecting hole and the right connecting hole together constitute the rotating shaft hole.

[0010] In order to increase the stability of the movable housing when it is flipped, a stabilizing mechanism is provided between the chassis and the movable housing, and the stabilizing mechanism includes an inner torsion spring and an outer torsion spring which are inserted through the rotating shaft; the inner torsion spring and the outer torsion spring both include a fixed arm fixed on the chassis and a movable arm fixed on the movable housing; when the movable housing closes the garage, the inner torsion spring is in a compressed state, and the outer torsion spring is in a relaxed state; on the contrary, when the movable housing opens the garage, the inner torsion spring is in a relaxed state, and the outer torsion spring is in a compressed state. In the process of the movable housing flipping and then from closing to opening the garage, the existence of the inner torsion spring and the outer torsion spring makes the movable housing subject to similar resistance; this avoids the situation that the movable housing flips easily when it is close to the ground and is very laborious when it is far from the ground due to the existence of gravity.

[0011] Preferably, the inner torsion spring comprises a first fixed arm horizontally fixed on the chassis and a first movable arm fixed on the movable housing, the first fixed arm extending from front to rear; the outer torsion spring comprises a second fixed arm horizontally fixed on the chassis and a second movable arm fixed on the movable housing, the second fixed arm extending from rear to front;

[0012] When the movable housing closes the garage, the first movable arm extends vertically upward, and the second movable arm extends horizontally backward; when the movable housing opens the garage, the first movable arm extends horizontally forward, and the second movable arm extends vertically upward. There are many forms of the inner torsion spring and the outer torsion spring, and a suitable form can be selected according to actual needs. In this embodiment, when the movable arm and the fixed arm of the torsion spring are parallel to each other, the torsion spring is in a relaxed state.

[0013] Preferably, an extending direction of the first movable arm of the inner torsion spring is always perpendicular to an extending direction of the second movable arm of the outer torsion spring.

[0014] To improve the connection firmness between the inner torsion spring and the outer torsion spring and the moving housing respectively, inner reinforcement plates and outer reinforcement plates are provided on the side wall of the moving housing rotatably connected to the chassis, and this side wall is located between the inner reinforcement plates and the outer reinforcement plates; among them, the first moving arm of the inner torsion spring on the same side as this side wall is connected to the inner reinforcement plate, and the second fixed arm of the outer torsion spring is connected to the outer reinforcement plate.

[0015] To facilitate the user to easily open and close the garage, the small anti-theft garage further includes an electric power assist mechanism. The electric power assist mechanism includes a transmission rod and a driver provided at the first end of the transmission rod and capable of driving the transmission rod to rotate upward around this end. The driver is fixed to the chassis, and the second end of the transmission rod is connected to the moving housing.

[0016] Preferably, the electric power assist mechanism is signal-connected to a remote control device. The user can remotely control the opening and closing of the garage.

[0017] Preferably, the driver is provided on the chassis and located below the fixed housing. The transmission rod includes a fixed rod and a moving rod that can be telescoped relative to the length direction of the fixed rod. One end of the fixed rod is connected to the driver, and the other end of the fixed rod is connected to the moving housing through the moving rod. The telescopic transmission rod facilitates the flexible setting of the electric power assist mechanism.

[0018] To reduce the working difficulty of the driver, connecting plates are respectively installed on the inner side of the left side wall and the inner side of the right side wall of the moving housing. The connecting plate includes a vertical plate arranged along the front-back direction of the garage and a horizontal plate horizontally extending outward from the lower side edge of the vertical plate. The vertical plate is spaced from the side wall of the moving housing, the inner side of the vertical plate is connected to the transmission rod, and the horizontal plate is connected to the moving housing.

[0019] Preferably, the vertical plate is triangular, the bottom edge of the triangular vertical plate is arranged parallel to the bottom edge of the side wall of the moving housing, and the transmission rod is connected to the top angle of the triangular vertical plate.

[0020] To reduce the self-weight of the garage and improve the strength of the housing, both the moving housing and the fixed housing are hollow plastic plates, and a recessed portion is formed by the inner side of the hollow plastic plate being recessed towards the inside of the hollow plastic plate.

[0021] To facilitate transportation, the moving housing includes a second left shell plate, a second middle shell plate, and a second right shell plate connected in sequence. The second left shell plate and the second right shell plate respectively extend upward from the left side and the right side of the chassis, and the second middle shell plate first extends upward and then forward from the rear side of the chassis, and the left and right sides of the second middle shell plate are respectively connected to the second left shell plate and the second right shell plate; the chassis is composed of several horizontally arranged monomers spliced together. The garage can be disassembled and spliced, reducing the transportation cost.

[0022] Compared with the prior art, the advantages of the present utility model are as follows: the moving housing rotates around the pivot structure axis to open or close the garage. During the rotation of the moving housing, the center of gravity is low and the stability is good; moreover, the change in the height of the center of gravity during the rotation process is small, which can save energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural view of the garage in the closed state in the embodiment of the present utility model;

[0024] Figure 2 is Figure 1 a cross-sectional view of the garage in

[0025] Figure 3 is Figure 1 a partial exploded view of the garage in

[0026] Figure 4 is Figure 3 an enlarged view of part A in

[0027] Figure 5 is Figure 3 an enlarged view of part B in

[0028] Figure 6 It is a schematic structural view of the garage in the open state in the embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The present utility model will be further described in detail below in conjunction with the embodiments of the drawings.

[0030] As Figures 1 to 6 shown, it is a preferred embodiment of the small anti-theft garage of the present utility model. The small anti-theft garage includes a chassis 1, a fixed housing 2 and a moving housing 3 arranged above the chassis 1. The chassis 1, the fixed housing 2 and the moving housing 3 jointly enclose a space for parking a motorcycle. The fixed housing 2 is fixedly connected to the front side of the chassis 1, and the moving housing 3 is movably connected to the rear side of the chassis 1 and is used to open or close the garage. When the garage is closed, the fixed housing 2 and the moving housing 3 are in the shape of half an eggshell.

[0031] Specifically, the chassis 1 is oval and is formed by splicing 4 monomers 12 in a 2*2 manner. The chassis 1 is provided with a fixing device 13 for fixing the front of the motorcycle. A left rotating shaft 111 is arranged on the left side of the chassis 1, and a right rotating shaft 112 is arranged on the right side of the chassis 1. The left rotating shaft 111 and the right rotating shaft 112 are collinear. An inclined pedal 325 for facilitating the motorcycle to enter the garage is provided at the rear end of the chassis 1.

[0032] The fixed housing 2 includes a first left housing plate 21, a first middle housing plate 22, and a first right housing plate 23 that are sequentially connected. The first left housing plate 21 and the first right housing plate 23 respectively extend upward first and then inward from the left and right sides of the chassis 1. The first middle housing plate 22 extends upward first and then backward from the front side of the chassis 1, and the left and right sides of the first middle housing plate 22 are respectively connected to the first left housing plate 21 and the first right housing plate 23; as Figure 3 shown, in this embodiment, the fixed housing 2 has a left side wall, a right side wall, a front side wall, and a top wall. Among them, the front side wall and the top wall are curved surfaces. The left side wall is mainly a plane, but the joints of the left side wall with the front side wall and the left side wall with the top wall are curved surfaces. The structure of the right side wall is the same as that of the left side wall, and the right side wall and the left side wall are symmetrically arranged left and right. The fixed housing 2 is generally in the shape of a quarter ellipsoid. In other embodiments, both the first left housing plate 21 and the first right housing plate 23 are sectors with a central angle of 90 degrees, and the first middle housing plate 22 connects the arc-shaped edges of the first left housing plate 21 and the first right housing plate 23.

[0033] In this embodiment, the orientation descriptions related to the moving housing 3 are all in the state where the moving housing 3 closes the garage. The shape of the moving housing 3 is substantially the same as that of the fixed housing 2. Similarly, the moving housing 3 includes a second left housing plate 31, a second middle housing plate 32, and a second right housing plate 33 that are sequentially connected. The second left housing plate 31 and the second right housing plate 33 respectively extend upward first and then inward from the left and right sides of the chassis 1. The second middle housing plate 32 extends upward first and then forward from the rear side of the chassis 1, and the left and right sides of the second middle housing plate 32 are respectively connected to the second left housing plate 31 and the second right housing plate 33. As Figure 3 shown, in this embodiment, the moving housing 3 has a left side wall, a right side wall, a front side wall, and a top wall. Among them, the front side wall and the top wall are curved surfaces. The left side wall is mainly a plane, but the joints of the left side wall with the front side wall and the left side wall with the top wall are curved surfaces. The structure of the right side wall is the same as that of the left side wall, and the right side wall and the left side wall are symmetrically arranged left and right. The moving housing 3 is generally in the shape of a quarter ellipsoid. A left connection hole 311 through which the rotating shaft 11 can penetrate is provided on the second left housing plate 31, and a right connection hole 331 through which the rotating shaft 11 can penetrate is provided on the second right housing plate 33. The moving housing 3 can be flipped with the rotating shaft 11 as the axis to open or close the garage. When the moving housing 3 opens the garage, the moving housing 3 covers the fixed housing 2, that is to say, the inner contour of the moving housing 3 is slightly larger than the outer contour of the fixed housing 2. In other embodiments, the outer contour of the moving housing 3 can also be slightly smaller than the inner contour of the fixed housing 2. In this way, when the moving housing 3 opens the garage, the moving housing 3 will be covered by the fixed housing 2.

[0034] In addition, a handle 321 is provided on the rear side of the second intermediate shell plate 32. The user can lift the handle 321 to flip the moving housing 3 so that the moving housing 3 covers the fixed housing 2, or lift the handle 321 to reverse the flip of the moving housing 3 to close the garage. A locking structure 322 for locking the moving housing 3 and the chassis 1 is also provided on the rear side of the second intermediate shell plate 32. The locking structure 322 can prevent the motorcycle in the garage from being stolen. Two ventilation devices 323 for connecting the internal space and the external space of the garage are provided on the top of the second intermediate shell plate 32. Two anti-collision blocks 324 are provided at the frontmost end of the top of the second intermediate shell plate 32. When the moving housing 3 fully opens the garage, the anti-collision blocks 324 play a buffering role at the moment when the moving housing 3 flips to contact the ground. A first sealing ring 71 for sealing the moving housing 3 and the fixed housing 2 when the garage is closed is provided at the front end opening of the moving housing 3. A second sealing ring 72 for sealing the moving housing 3 and the chassis 1 when the garage is closed is provided at the lower end opening of the moving housing 3.

[0035] In addition, in order to reduce the self-weight of the garage and improve the strength of the housing, both the moving housing 3 and the fixed housing 2 are hollow plastic plates. The hollow plastic plates have a fireproof function, and a recessed portion 6 is formed by the inner side of the hollow plastic plate recessing towards the inside of the hollow plastic plate.

[0036] In order to increase the stability of the moving housing 3 during flipping, a stabilizing mechanism is provided between the chassis 1 and the moving housing 3. The stabilizing mechanism includes inner torsion springs 41 and outer torsion springs 42 sleeved on the left rotating shaft 111 and inner torsion springs 41 and outer torsion springs 42 sleeved on the right rotating shaft 112. In this embodiment, both the inner torsion spring 41 and the outer torsion spring 42 are in a relaxed state when the fixed arm and the moving arm are parallel.

[0037] The inner torsion spring 41 includes a first fixed arm 411 horizontally fixed on the chassis 1 and a first moving arm 412 fixed on the moving housing 3. The first fixed arm 411 extends from front to back, and the first moving arm 412 can rotate with the moving housing 3. The outer torsion spring 42 includes a second fixed arm 421 horizontally fixed on the chassis 1 and a second moving arm 422 fixed on the moving housing 3. The second fixed arm 421 extends from back to front, and the second moving arm 422 can also rotate with the moving housing 3. As Figures 3 to 5As shown, when the moving housing 3 closes the garage, the first moving arm 412 extends vertically upward, and the second moving arm 422 extends horizontally backward; when the moving housing 3 opens the garage, the first moving arm 412 extends horizontally forward, and the second moving arm 422 extends vertically upward. When the moving housing 3 closes the garage, the inner torsion spring 41 is in a compressed state, and the outer torsion spring 42 is in a relaxed state; conversely, when the moving housing 3 opens the garage, the inner torsion spring 41 is in a relaxed state, and the outer torsion spring 42 is in a compressed state; in any state of the moving housing 3 from closing to opening the garage, the extending direction of the first moving arm 412 of the inner torsion spring 41 is always perpendicular to the extending direction of the second moving arm 422 of the outer torsion spring 42. The presence of the inner torsion spring 41 and the outer torsion spring 42 enables the moving housing 3 to receive approximately the same resistance in any state from closing to opening the garage; it avoids the situation that due to the existence of gravity, the moving housing 3 is very easy to flip when close to the ground and very difficult to flip when far from the ground.

[0038] To improve the connection firmness between the inner torsion spring 41 and the outer torsion spring 42 and the moving housing 3 respectively. Inner reinforcement plates 34 and outer reinforcement plates 35 that are both attached to the second left housing plate 31 are respectively connected to the inner and outer sides of the second left housing plate 31 of the moving housing 3, and inner reinforcement plates 34 and outer reinforcement plates 35 that are both attached to the second right housing plate 33 are respectively connected to the inner and outer sides of the second right housing plate 32 of the moving housing 3. The inner reinforcement plates 34 and the outer reinforcement plates 35 are connected to the housing plates by a plurality of scattered screws, with firm connection; the first moving arm 412 of the inner torsion spring 41 is connected to the inner side surface of the inner reinforcement plate 34 through a connecting member 300, and the second fixed arm 421 of the outer torsion spring 42 is connected to the outer side surface of the outer reinforcement plate 35 through a connecting member 300. The moving housing 3 is made of plastic material, and the strength of the structure is relatively low. Directly connecting the inner torsion spring 41 and the outer torsion spring 42 to the moving housing 3 will accelerate the wear of the moving housing 3; in this embodiment, the inner reinforcement plates 34 and the outer reinforcement plates 35 are made of metal material, avoiding the wear of the moving housing 3 by the inner torsion spring 41 and the outer torsion spring 42.

[0039] To facilitate the user to easily open and close the garage, electric assist mechanisms 5 are respectively arranged near the second left housing plate 31 and the second right housing plate 33 in the garage. The electric assist mechanisms 5 are signal-connected to a remote control device, and the user can open or close the garage at a place far from the garage through the remote control device.

[0040] Specifically, the electric assist mechanism 5 includes a transmission rod 51 and a driver 52. The transmission rod 51 includes a fixed rod 511 and a moving rod 512 that is telescopic in the length direction relative to the fixed rod 511. One end of the fixed rod 511 is connected to the driver 52, the other end of the fixed rod 511 is inserted into the moving rod 512, and the end of the moving rod 512 far from the fixed rod 511 is connected to the moving housing 3; the driver 52 is located on the chassis 1 below the fixed housing 2, and the driver 52 can drive the fixed rod 511 and the moving rod 512 to rotate around the driver 52.

[0041] In addition, a connecting plate 36 is provided inside the second left shell plate 31 of the moving housing 3. The connecting plate 36 includes a vertical plate 361 arranged along the front-back direction of the garage and a horizontal plate 362 extending horizontally outward from the lower edge of the vertical plate 361. The vertical plate 361 is spaced from the second left shell plate 31 of the moving housing 3. The vertical plate 361 is triangular, the bottom edge of the triangular vertical plate 361 is arranged parallel to the bottom edge of the second left shell plate 31, and the transmission rod 51 is connected to the apex angle of the triangular vertical plate 361. The horizontal plate 362 is located below the second left shell plate 31, and two parallel connecting plates 363 extend upward from the horizontal plate 362, and the connecting plates 363 are connected to the inner and outer side walls of the second left shell plate 31.

[0042] As Figure 1 , 3 , shown in Figure 6, in order to improve the aesthetics and cleanliness of the garage, a dust-proof plate 81 covering the connection structure between the outer reinforcement plate 35 and the outer torsion spring 42 is provided outside the outer reinforcement plate 35, and a dust-proof cover 82 for accommodating the outer torsion spring 42 is provided outside the outer torsion spring 42.

Claims

1. A small anti-theft garage, comprising a chassis (1), a fixed housing (2) and a movable housing (3) respectively arranged above the chassis (1). The fixed housing (2) is fixedly connected to the front side of the chassis (1), and the movable housing (3) is movably connected to the rear side of the chassis (1) and is used to open or close the garage, characterized in that: The moving housing (3) is rotatably connected to the chassis (1) through a pivot structure to cooperate with the flipping of the moving housing; wherein, the pivot structure is located at the front of the moving housing (3).

2. The small anti-theft garage according to claim 1, characterized in that: A rotating shaft (11) arranged along the left - right direction of the garage is provided on the chassis (1), and a rotating shaft hole is provided below the moving housing (3) for the rotating shaft to penetrate into to cooperate with the flipping of the moving housing; wherein, the rotating shaft (11) and the rotating shaft hole together constitute the pivot structure.

3. The small anti-theft garage according to claim 2, characterized in that: A stabilizing mechanism is provided between the chassis (1) and the moving housing (3), and the stabilizing mechanism includes an inner torsion spring (41) and an outer torsion spring (42) sleeved on the rotating shaft (11); both the inner torsion spring (41) and the outer torsion spring (42) include a fixed arm fixed to the chassis (1) and a moving arm fixed to the moving housing (3); in the state where the moving housing (3) closes the garage, the inner torsion spring (41) is in a compressed state, and the outer torsion spring (42) is in a relaxed state; on the contrary, in the state where the moving housing (3) opens the garage, the inner torsion spring (41) is in a relaxed state, and the outer torsion spring (42) is in a compressed state.

4. The small anti - theft garage according to claim 3, characterized in that: The inner torsion spring (41) includes a first fixed arm (411) horizontally fixed to the chassis (1) and a first moving arm (412) fixed to the moving housing (3), and the first fixed arm (411) extends from front to back. The outer torsion spring (42) includes a second fixed arm (421) horizontally fixed to the chassis (1) and a second moving arm (422) fixed to the moving housing (3), and the second fixed arm (421) extends from back to front. In the state where the moving housing (3) closes the garage, the first moving arm (412) extends vertically upward, and the second moving arm (422) extends horizontally backward. In the state where the moving housing (3) opens the garage, the first moving arm (412) extends horizontally forward, and the second moving arm (422) extends vertically upward.

5. The small anti-theft garage according to claim 4, characterized in that: An inner reinforcing plate (34) and an outer reinforcing plate (35) are provided on the side wall of the moving housing (3) rotatably connected to the chassis (1), and the side wall is located between the inner reinforcing plate (34) and the outer reinforcing plate (35); wherein, the first moving arm (412) of the inner torsion spring (41) on the same side as this side wall is connected to the inner reinforcing plate (34), and the second fixed arm (421) of the outer torsion spring (42) is connected to the outer reinforcing plate (35).

6. The small anti-theft garage according to claim 1, characterized in that: An electric power assist mechanism (5) is further included, and the electric power assist mechanism (5) includes a transmission rod (51) and a driver (52) provided at the first end of the transmission rod (51) and capable of driving the transmission rod (51) to rotate upward around this end, the driver (52) is fixed to the chassis (1), and the second end of the transmission rod (51) is connected to the moving housing (3).

7. The small anti-theft garage according to claim 6, characterized in that: The driver (52) is disposed on the chassis (1) and below the fixed housing (2). The transmission rod (51) includes a fixed rod (511) and a movable rod (512) that is telescopic in the length direction of the fixed rod (511). One end of the fixed rod (511) is connected to the driver (52), and the other end of the fixed rod (511) is connected to the movable housing (3) through the movable rod (512).

8. The small anti-theft garage according to claim 7, characterized in that: Connection plates (36) are respectively installed on the inner sides of the left side wall and the right side wall of the movable housing (3). The connection plate (36) includes a vertical plate (361) arranged along the front-back direction of the garage and a horizontal plate (362) horizontally extending outward from the lower edge of the vertical plate (361). The vertical plate (361) is spaced from the side wall of the movable housing (3), the inner side of the vertical plate (361) is connected to the transmission rod (51), and the horizontal plate (362) is connected to the movable housing (3).

9. The small anti-theft garage according to any one of claims 1 to 8, characterized in that: Both the movable housing (3) and the fixed housing (2) are hollow plastic plates, and a recessed portion (6) is formed by the inner side of the hollow plastic plate being recessed toward the inside of the hollow plastic plate.

10. The small anti-theft garage according to any one of claims 1 to 8, characterized in that: The movable housing (3) includes a second left shell plate (31), a second middle shell plate (32), and a second right shell plate (33) connected in sequence. The second left shell plate (31) and the second right shell plate (33) respectively extend upward from the left side and the right side of the chassis (1), and the second middle shell plate (32) extends upward first and then forward from the rear side of the chassis (1), and the left and right sides of the second middle shell plate (32) are respectively connected to the second left shell plate (31) and the second right shell plate (33); The chassis (1) is formed by splicing a plurality of horizontally arranged monomers (12).

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