Mobile communication node and gateway equipment

Abstract

The invention relates to the related technical field of mobile gateway devices, in particular to a mobile communication node and gateway device.The mobile communication node comprises a bottom plate, the top of the bottom plate is connected with a top plate through a first telescopic piece, the two sides of the bottom plate are connected with a first side plate and a second side plate through second telescopic pieces respectively, and the rear end of the top plate is connected with a rear side plate; a front side plate is arranged between the front end of the bottom plate and the front end of the top plate, a gateway equipment body is placed and installed on the bottom plate, an antenna is installed on the side portion of the gateway equipment body in an inserted mode, a signal adjusting assembly is installed at the bottom end of the top plate, a sleeve body is installed at the bottom of the signal adjusting assembly, and the antenna is sleeved with the sleeve body. The box body structure is formed by the plate-shaped structures to accommodate the gateway equipment body, the antenna and the signal adjusting assembly, movement and protection are facilitated, and during use, the angle of the antenna can be adjusted through the signal adjusting assembly, so that the antenna can quickly and accurately find out the angle when the signal intensity is maximum.

Description

Technical Field

[0001] The present invention relates to the technical field related to mobile gateway devices, and in particular to a mobile communication node and a gateway device. Background Art

[0002] A gateway device, also known as an internetwork connector or protocol converter, is a computer system or device that provides data conversion services between multiple networks. It can be said that a gateway device is a connector between different networks and serves as a node for communication between various devices.

[0003] An external antenna type gateway device is a common external gateway device. This type of gateway device is generally equipped with multiple antennas to achieve the effect of high-performance signal reception. Although the external antenna type gateway device can achieve high signal coverage, the distribution of the antenna requires a certain space, and it is inconvenient to store and transport, and is easy to be damaged. When in use, it is necessary to manually adjust the antenna angle to improve the signal reception effect, which is relatively inconvenient. For this reason, technical personnel in this field have proposed a mobile communication node and gateway device to solve the problems raised in the above background. Summary of the invention

[0004] The object of the present invention is to provide a mobile communication node and a gateway device to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A mobile communication node and gateway device, comprising: A bottom plate, a first telescopic member is installed at the top of the rear portion, a second telescopic member is installed at both side ends, and a plurality of lower positioning plates are connected to the top of the bottom in an annular distribution, wherein the arrangement position of the lower positioning plates corresponds to the shape and size of the bottom of the gateway device body; A top plate, the rear bottom end of which is mounted on the top end of the first telescopic member, and a control box and an operation panel are mounted on the bottom and top ends thereof respectively; A rear side plate, the top end of which is fixedly connected to the rear end of the top plate; A front side plate, detachably mounted between the front end of the bottom plate and the front end of the top plate; A first side plate, whose outer side wall is mounted with a plurality of action wheels, and whose inner side wall is mounted on the end of one of the second telescopic members; A second side plate, the outer side wall of which is provided with a handle, and the inner side wall of which is provided at the end of another of the second telescopic members; The gateway device body is arranged on the top of the bottom plate and is limited by the lower positioning plate; Antennas, the number of which is set to be several, which include a pole part and a plug part, the pole part is hinged to the plug part, and the plug part is inserted and installed on the side of the gateway device body; A signal conditioning component is installed at the bottom end of the side of the top plate, the number and position of the signal conditioning component are corresponding to the antenna, and a sleeve is installed at the bottom of the signal conditioning component; The sleeve body is sleeved on the wire rod part, and slides on the wire rod part when it moves, and drives the wire rod part to move obliquely; As a further solution of the present invention: the bottom plate, the top plate, the first side plate, the second side plate, the front side plate, and the rear side plate can be combined together to form a box structure, and the gateway device body, the antenna, and the signal adjustment component can be accommodated therein.

[0006] A mounting frame is installed at the bottom end of the top plate, and the signal conditioning assembly includes: A driving member is installed in the mounting frame, and a first connecting plate is installed at the bottom output end of the driving member; A movable plate, a sleeve body is detachably mounted on the side of the movable plate, a rotating column is mounted on the top of the movable plate, and a second connecting plate is mounted on the top of the rotating column; The third telescopic member has a top end rotatably connected to the bottom of the first connecting plate, and a bottom end rotatably connected to the top of the second connecting plate.

[0007] As a further solution of the present invention: a docking block is connected to the side of the movable plate, a mounting block is connected to an outer wall of one side of the sleeve, and a docking groove cooperating with the docking block is provided at a side end of the mounting block.

[0008] As a further solution of the present invention: an upper positioning plate is installed at the bottom end of the side of the top plate, and the setting position of the upper positioning plate corresponds to the top shape and size of the gateway device body. A stop block is installed in the middle of the bottom end of the top plate, and the thickness of the stop block is greater than the thickness of the control box.

[0009] As a further solution of the present invention: the top and bottom ends of the front side plate are both connected with plug blocks, the front top end of the bottom plate is provided with a lower slot that cooperates with the corresponding plug block, and the front bottom end of the top plate is provided with an upper slot that cooperates with the corresponding plug block.

[0010] As a further solution of the present invention: an oblique opening is provided on one side of the upper portion of the lower positioning plate close to the center of the bottom plate.

[0011] As a further solution of the present invention: installation grooves are provided at the bottoms of both ends of the bottom plate, the first telescopic member is installed in the installation grooves, and the bottoms of the installation grooves are closed by detachably installed sealing plates.

[0012] The present invention has the following benefits: 1. The device drives the movable plate to move through the signal adjustment component, and then drives the sleeve to move. The sleeve can drive the antenna to rotate to adjust the angle of the antenna. The movable sleeve moves in an arc with a certain diameter. When the movable sleeve moves in an arc, the diameter of the circle corresponding to the arc movement route is gradually increased, so that the movement route of the movable sleeve can cover a sector-shaped adjustment area with a certain area. The movable sleeve is set on the antenna, so that the movable sleeve can drive the antenna to rotate with the movable connection part at the bottom of the antenna as the axis, and the rotation range of the antenna covers the entire sector-shaped adjustment area. In this way, the signal strength adjustment of the antenna is simulated by manually dialing the antenna. Compared with the manual adjustment method, the adjustment can have higher accuracy in combination with the signal strength display of the gateway device body, and can accurately find the angle when the antenna receives the strongest signal. The entire adjustment process can be automatically realized through a set program, which is labor-saving and efficient; 2. After the gateway device body is placed on the bottom plate, the bottom plate, the top plate, the first side plate, the second side plate, the front side plate, and the rear side plate cooperate to form a box structure to close the gateway device body. The setting of the lower positioning plate fixes the position of the gateway device body in the box structure. When the position of the box structure changes, the gateway device body will not shake in the box structure. During the process of moving the top plate down for assembly, the signal adjustment component can be used to drive the antenna to rotate, so that the antenna is converted from an upright state to a flat state for storage. After that, the box structure is erected, and the moving wheels and handles can be used to facilitate the movement and transportation of the box structure. When the box structure is laid flat with the bottom plate at the bottom, the top plate is driven to move up by the first telescopic member, and the first side plate and the second side plate are respectively driven to move horizontally by the two second telescopic members. At this time, the box structure is opened, and when the top plate moves up, it can drive the antenna from a flat state to an upright state. Remove the front side plate, start the signal adjustment component, and the angle of the antenna can be automatically adjusted to quickly and accurately receive node signals. It is convenient and quick to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall storage state structure of an embodiment of the present invention.

[0014] Figure 2 It is a schematic diagram of a partially opened state structure of an embodiment of the present invention.

[0015] Figure 3 The figure is a schematic diagram of the installation structure of the gateway device body in the embodiment of the present invention.

[0016] Figure 4 Schematic diagram of the inner bottom surface structure of the top plate in an embodiment of the present invention.

[0017] Figure 5 Schematic diagram of the structure of the front side plate in an embodiment of the present invention.

[0018] Figure 6 Schematic diagram of the bottom structure of the bottom plate in an embodiment of the present invention.

[0019] Figure 7 It is a schematic diagram of the assembly of the movable plate and the sleeve in an embodiment of the present invention.

[0020] Figure 8 for Figure 3 A magnified schematic diagram of part A in FIG.

[0021] Fig. 9 It is a top view of the moving track of the movable plate in the embodiment of the present invention.

[0022] In the figure: 1, bottom plate; 101, first telescopic member; 102, second telescopic member; 103, lower positioning plate; 104, oblique opening; 105, lower slot; 106, mounting slot; 107, sealing plate; 108, fixing plate; 109, fixing slot; 2, top plate; 201, upper slot; 202, control box; 203, operation panel; 204, upper positioning plate; 205, mounting bracket; 206, blocking block; 3, rear side plate; 4, front side plate; 401, plug-in block; 5, first One side panel; 501, action wheel; 6, second side panel; 601, handle; 7, gateway device body; 8, antenna; 801, pole part; 802, plug part; 9, signal adjustment component; 901, drive member; 902, first connecting plate; 903, third telescopic member; 904, second connecting plate; 905, rotating column; 906, movable plate; 907, docking block; 10, sleeve; 1001, mounting block; 1002, docking slot; 11, box structure. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described in detail below in conjunction with specific implementation methods.

[0024] Example 1: Please refer to Figures 1 to 5A mobile communication node and gateway device, comprising a bottom plate 1, a first telescopic member 101 is installed at the top of the rear portion of the bottom plate 1, and second telescopic members 102 are installed at both sides of the bottom plate 1. A plurality of lower positioning plates 103 are connected to the top of the bottom plate 1 in a ring shape. The setting position of the lower positioning plates 103 corresponds to the bottom shape and size of the gateway device body 7. In this embodiment, the lower positioning plates 103 are arranged in four numbers distributed along the front, back, left and right directions of the bottom plate 1. The gateway device body 7 is placed in the middle of the top of the bottom plate 1. The bottoms of the four outer side walls of the gateway device body 7 are respectively against the side walls of the four lower positioning plates 103. The top of the first telescopic member 101 is connected to the bottom of the rear portion of the top plate 2. The bottom and top of the top plate 2 are respectively installed with control Box 202 and operation panel 203, each functional electrical component is connected to the control box 202 line, the operation panel 203 is provided with a keyboard, a display screen and an external interface (for charging and data transmission), the rear end of the top plate 2 is fixedly connected to the top of the rear side plate 3, the front side plate 4 is detachably installed between the front end of the bottom plate 1 and the front end of the top plate 2, the front end of the gateway device after placement has a display structure, and the gateway device body 7 can be observed and used by removing the front side plate 4, the rear side plate 3 is fixedly connected to the rear end of the top plate 2 for easy setting, the first side plate 5 and the second side plate 6 are respectively provided on both sides of the bottom plate 1, the outer side wall of the first side plate 5 is installed with a plurality of action wheels 501, and the inner side wall of the first side plate 5 is installed at the end of one of the second telescopic members 102 , a handle 601 is installed on the outer wall of the second side panel 6, and the inner wall of the second side panel 6 is installed on the end of another second telescopic member 102. The gateway device body 7 is arranged at the top of the bottom plate 1 and is limited by the lower positioning plate 103. The side of the gateway device body 7 is provided with a jack to insert the antenna 8. The antenna 8 includes a pole part 801 and a plug part 802. The pole part 801 is hinged to the plug part 802. The plug part 802 is inserted and installed on the side of the gateway device body 7. The plug part 802 can generate relative rotation with the gateway device body 7 (the antenna 8 jack of the gateway device is mostly rectangular, and the middle part of the conventional plug part 802 is provided with a rotatable structure, and the plug part 802 is inserted into the antenna The end of the line 8 in the jack does not rotate, while the end of the plug part 802 hinged to the pole part 801 can rotate), the rotatable connection between the plug part 802 and the gateway device body 7 enables the pole part 801 to rotate in the vertical direction, and the hinge between the pole part 801 and the plug part 802 enables the pole part 801 to rotate in the horizontal direction. A plurality of signal adjustment components 9 are installed at the bottom end of the side of the top plate 2. The number and position of the signal adjustment components 9 correspond to the antenna 8. A sleeve 10 is installed at the bottom of the signal adjustment component 9. The sleeve 10 is sleeved on the pole part 801. The sleeve 10 is driven to move by the adjustment component, and then the pole part 801 is driven to tilt and rotate by the sleeve 10.When the sleeve 10 moves, it slides on the wire rod part 801, and the bottom plate 1, the top plate 2, the first side plate 5, the second side plate 6, the front side plate 4, and the rear side plate 3 can be combined together to form a box structure 11, and the gateway device body 7, the antenna 8, and the signal adjustment component 9 are stored therein.

[0025] See also Figure 2 , Figure 3 , Figure 4 , Figure 8 A mounting frame 205 is installed at the bottom end of the top plate 2, and the signal adjustment component 9 includes a driving member 901, a movable plate 906 and a third telescopic member 903. The driving member 901 is installed in the mounting frame 205, and a first connecting plate 902 is installed at the bottom output end of the driving member 901. The bottom of the first connecting plate 902 is rotatably connected to the top of the third telescopic member 903. The movable plate 906 is L-shaped, and a sleeve 10 is detachably installed on the side of the movable plate 906. A rotating column 905 is installed at the top of the movable plate 906, and a second connecting plate 904 is installed at the top of the rotating column 905. The second connecting plate 904 can generate relative rotation with the movable plate 906 through the rotating column 905, and the bottom of the third telescopic member 903 is rotatably connected to the top of the second connecting plate 904.

[0026] See also Figure 2 , Figure 7 , Figure 8 A docking block 907 is connected to the side of the movable plate 906, and a mounting block 1001 is connected to the outer wall of one side of the sleeve body 10. The mounting block 1001 is T-shaped, and a docking groove 1002 cooperating with the docking block 907 is provided at the side end of the mounting block 1001. The mounting block 1001 is integrally formed with the sliding sleeve, and the mounting block 1001 is made of elastic plastic material. The docking block 907 is installed in the docking groove 1002 by extrusion and insertion, and the docking block 907 is clamped by the clamping structure provided at the end of the docking groove 1002. The docking block 907 can be pulled out of the docking groove 1002 by manual force. The connection strength between the docking block 907 and the docking groove 1002 can meet the movement requirement of the pole part 801.

[0027] This embodiment provides a signal conditioning solution for antenna 8: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 8When the box structure 11 is laid flat with the bottom plate 1 at the bottom, the first telescopic member 101 is started to drive the top plate 2 to move upward, and the top plate 2 moves upward to drive the signal adjustment component 9 to move upward, and then the wire rod part 801 is driven to rotate through the sliding sleeve, and the wire rod part 801 is converted from a flat state to an upright state, and the first side plate 5 and the second side plate 6 are driven to move horizontally by starting the second telescopic member 102, and the front side plate 4 is removed. Then, the gateway device body 7 is used, and the gap between the side end of the top plate 2 and the top of the second side plate 6 provides a movable space for the adjustment of the antenna 8. The first connecting plate 902 is driven to rotate by the driving member 901, and the two ends of the third telescopic member 903 are connected by the shaft. The third telescopic member 903 is rotatably connected with the first connecting plate 902 and the second connecting plate 904 in a connected manner. When the position of the first connecting plate 902 is fixed, the third telescopic member 903 can only rotate relative to the first connecting plate 902 in a vertical plane. According to this principle, the position of the first connecting plate 902 is adjusted so that the third telescopic member 903 can only rotate forward or backward relative to the first connecting plate 902, and the movable block is close to the position directly below the first connecting plate 902. Then, the signal adjustment operation is performed. The signal adjustment component 9 adjusts the inclination angle of the wire rod part 801 by adjusting the position of the sleeve 10. The movement trajectory of the sleeve 10 is consistent with the movable plate 906. Fig. 9 The top view of the moving trajectory of the movable plate 906 is that the third telescopic member 903 is first extended to a certain length, and the movable block moves forward tiltingly, and at the same time drives the wire rod part 801 to tilt forward to a certain angle. Then, the driving member 901 is started to drive the first connecting plate 902 to rotate 180° counterclockwise. At this time, the moving trajectory of the movable plate 906 in the horizontal direction is a semicircular arc. When the movable plate 906 moves, the sliding sleeve is simultaneously driven to move, and the sliding sleeve drives the wire rod part 801 to cross a 180° fan-shaped area at a certain tilt angle. In this process, the position of the sliding sleeve on the wire rod part 801 can be automatically adjusted, and the third telescopic member 903 will not be stuck during rotation. Then, the third telescopic member 903 is extended to a certain length. At this time, the tilt angle of the wire rod part 801 increases, and then the driving member 90 1 drives the first connecting plate 902 to rotate 180° clockwise. At this time, the pole part 801 passes through the 180° fan-shaped area with a larger tilt angle, and the inclination of the pole part 801 is gradually increased by gradually increasing the length of the third telescopic member 903. At the same time, the inclination and rotation of the pole part 801 are coordinated to enable the pole part 801 to perform a large-area and all-round angular position adjustment on the side of the gateway device body 7. The adjustment range is related to the elongation of the third telescopic member 903. The pole part 801 has a larger inclination to meet the signal reception requirement. During the adjustment process, the position of the pole part 801 when the signal reception strength of the gateway device body 7 is the largest is recorded. After the adjustment, the pole part 801 is adjusted to this position to ensure the signal reception strength.

[0028] Example 2: See Figures 1 to 4On the basis of the first embodiment, an upper positioning plate 204 is installed at the bottom end of the side of the top plate 2, and the setting position of the upper positioning plate 204 corresponds to the top shape and size of the gateway device body 7. A stop block 206 is installed in the middle of the bottom end of the top plate 2. The thickness of the stop block 206 is greater than the thickness of the control box 202, ensuring that when the box structure 11 is combined, the top of the gateway device body 7 will not be directly squeezed to the control box 202.

[0029] See also Figures 1 to 5 The top and bottom of the front side plate 4 are connected with plug blocks 401, the front top of the bottom plate 1 is provided with a lower slot 105 matched with the corresponding plug block 401, the front bottom of the top plate 2 is provided with an upper slot 201 matched with the corresponding plug block 401, and the upper part of the lower positioning plate 103 is provided with an oblique opening 104 on one side close to the center of the bottom plate 1, through which the gateway device body 7 is conveniently installed on the bottom plate 1 quickly, and the bottoms of both ends of the bottom plate 1 are A mounting groove 106 is provided, the first telescopic member 101 is installed in the mounting groove 106, the bottom of the mounting groove 106 is closed by a detachably installed groove sealing plate 107, fixing grooves 109 are provided on both sides of the mounting groove 106, and fixing plates 108 are connected to both sides of the groove sealing plate 107. After the second telescopic member 102 is installed in the mounting groove 106, the fixing plate 108 is installed in the fixing groove 109 by bolts, and the groove sealing plate 107 seals the mounting groove 106.

[0030] The present embodiment provides a solution for installing and storing the box structure 11: lay the bottom plate 1 flat, place the gateway device body 7 on the top of the bottom plate 1, and fit the bottom outer wall of the gateway device body 7 with the side wall of the lower positioning plate 103, so that the antenna 8 is in a vertical state, and put the sleeve 10 on the pole part 801, and the lower part of the signal adjustment component 9 droops, and adjust the position of the sleeve 10, and squeeze the docking block 907 into the docking groove 1002. At this time, the mounting block 1001 is installed on the side of the movable plate 906, and the bottom of the front side plate 4 is plugged and installed to the front top of the bottom plate 1 through the plug block 401, and the top plate 2 is driven to move downward by the first telescopic member 101. When moving downward, the signal adjustment component 9 drives the plug part 802 to rotate, and then gradually converts the antenna 8 from the vertical state to the horizontal state, until the bottom end of the stop block 206 abuts against the top of the gateway device body 7. At this time The top of the front side panel 4 is plugged into the front bottom end of the top panel 2, and the side wall of the upper positioning plate 204 is fitted with the top outer side wall of the gateway device body 7. The two second telescopic members 102 respectively drive the first side panel 5 and the second side panel 6 to move until the bottom side walls of the first side panel 5 and the second side panel 6 are docked with the side ends of the bottom panel 1, and the top side walls of the first side panel 5 and the second side panel 6 are docked with the side ends of the top panel 2. The box structure 11 is then assembled, and then the box structure 11 can be erected, moved by the action wheels 501 or carried by the handle 601. The first side panel 5 and the second side panel 6 are L-shaped, and the length of the top panel 2 is less than the length of the bottom panel 1. The length of the top panel 2 corresponds to the length of the gateway device body 7, so that the installation position of the signal adjustment component 9 can be between the side end of the gateway device body 7 and the antenna 8, thereby facilitating the position adjustment of the antenna 8.

[0031] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0032] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A mobile communication node and gateway device, characterized in that: include: A bottom plate, a first telescopic member is installed at the top of the rear portion, a second telescopic member is installed at both side ends, and a plurality of lower positioning plates are connected to the top of the bottom in an annular distribution, wherein the arrangement position of the lower positioning plates corresponds to the shape and size of the bottom of the gateway device body; A top plate, the rear bottom end of which is mounted on the top end of the first telescopic member, and a control box and an operation panel are mounted on the bottom and top ends thereof respectively; A rear side plate, the top end of which is fixedly connected to the rear end of the top plate; A front side plate, detachably mounted between the front end of the bottom plate and the front end of the top plate; A first side plate, whose outer side wall is mounted with a plurality of action wheels, and whose inner side wall is mounted on the end of one of the second telescopic members; A second side plate, the outer side wall of which is provided with a handle, and the inner side wall of which is provided at the end of another of the second telescopic members; The gateway device body is arranged on the top of the bottom plate and is limited by the lower positioning plate; Antennas, the number of which is set to be several, which include a pole part and a plug part, the pole part is hinged to the plug part, and the plug part is inserted and installed on the side of the gateway device body; A signal conditioning component is installed at the bottom end of the side of the top plate, the number and position of the signal conditioning component are corresponding to the antenna, and a sleeve is installed at the bottom of the signal conditioning component; The sleeve body is sleeved on the wire rod part, and slides on the wire rod part when it moves, and drives the wire rod part to move obliquely; The bottom plate, the top plate, the first side plate, the second side plate, the front side plate, and the rear side plate can be combined together to form a box structure, and the gateway device body, the antenna, and the signal adjustment component can be accommodated therein.

2. A mobile communication node and gateway device according to claim 1, characterized in that: A mounting frame is installed at the bottom end of the top plate, and the signal conditioning assembly includes: A driving member, mounted in the mounting frame, with a first connecting plate mounted at the bottom output end thereof; A movable plate, a sleeve body is detachably mounted on the side of the movable plate, a rotating column is mounted on the top of the movable plate, and a second connecting plate is mounted on the top of the rotating column; The third telescopic member has a top end rotatably connected to the bottom of the first connecting plate, and a bottom end rotatably connected to the top of the second connecting plate.

3. A mobile communication node and gateway device according to claim 2, characterized in that: The side of the movable plate is connected with a docking block, the outer wall of one side of the sleeve is connected with a mounting block, and the side end of the mounting block is provided with a docking groove matched with the docking block.

4. A mobile communication node and gateway device according to claim 1, characterized in that: An upper positioning plate is installed at the bottom end of the side of the top plate, and the setting position of the upper positioning plate corresponds to the top shape and size of the gateway device body. A stop block is installed in the middle of the bottom end of the top plate, and the thickness of the stop block is greater than the thickness of the control box.

5. A mobile communication node and gateway device according to claim 1, characterized in that: The top and bottom ends of the front side plate are both connected with plug blocks, the front top end of the bottom plate is provided with a lower slot matched with the corresponding plug block, and the front bottom end of the top plate is provided with an upper slot matched with the corresponding plug block.

6. A mobile communication node and gateway device according to claim 1, characterized in that: An oblique opening is arranged on one side of the upper portion of the lower positioning plate close to the center of the bottom plate.

7. A mobile communication node and gateway device according to claim 1, characterized in that: The bottoms of both ends of the bottom plate are provided with mounting grooves, the first telescopic member is installed in the mounting grooves, and the bottoms of the mounting grooves are closed by detachably installed groove sealing plates.

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