Mounting structure of DC-DC converter for solar photovoltaic power generation

Abstract

The utility model relates to the technical field of photovoltaic power generation, and discloses a mounting structure of a DC-DC converter for solar photovoltaic power generation, which comprises a transverse plate, a connecting plate is arranged in an inner cavity of the transverse plate, a converter main body is fixedly connected to the top of the connecting plate, and a heat conducting plate is fixedly connected to the top of the converter main body. Uniformly distributed cooling fins are fixedly connected to the top of the heat conducting plate; the two sides of the top of the transverse plate are fixedly connected with shells, and the inner walls of the shells are fixedly connected with springs. According to the utility model, the converter main body can be mounted or dismounted through clear and relatively simple operation steps, a user only needs to rotate the threaded rod and the fixed plate in sequence to complete the corresponding process, complicated tools or professional skills are not needed, workers can conveniently and quickly operate, and the working efficiency is improved. When the converter main body needs to be overhauled or replaced, the converter main body can be conveniently pulled out, and the whole dismounting process is clear.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic power generation technical field, concretely is a kind of installation structure of solar photovoltaic power generation DC-DC converter. BACKGROUND

[0002] Electric automobile direct current voltage converter is also called electric automobile DC-DC voltage converter. It is a kind of DC voltage converter that can convert the higher DC voltage of electric automobile vehicle-mounted battery into 12V DC voltage, since the power supply used by vehicle-mounted accessories such as headlamp, windshield wiper, fan, radio, airbag, electric window and various instruments in vehicle is 12V standard DC voltage, and the voltage of battery equipped in electric automobile is relatively high, generally at 48V-90V, therefore, it is necessary to be equipped with DC voltage converter to convert higher DC voltage of battery into 12V DC voltage output, to meet the standard DC voltage supply requirement of vehicle-mounted accessories.

[0003] The installation structure of solar photovoltaic power generation DC-DC converter is used for installing and fixing DC-DC converter, but the existing DC-DC converter installation structure has some defects in use, such as not having portable fixing mechanism, users need to find additional tools to fix solar photovoltaic power generation DC-DC converter, which is time-consuming and laborious, and external tools are also needed for maintenance, which makes it inconvenient to disassemble and maintain, causes trouble to use, and cannot meet the needs of today's market. UTILITY MODEL CONTENT

[0004] (I) technical problem solved

[0005] In view of the defects of prior art, the utility model provides an installation structure of solar photovoltaic power generation DC-DC converter, which has the advantages of convenient installation and easy disassembly and maintenance, and solves the problem that the existing DC-DC converter installation structure does not have portable fixing mechanism.

[0006] (II) technical scheme

[0007] In order to achieve the above-mentioned installation convenient and convenient dismounting maintenance purposes, the utility model provides the following technical scheme: a kind of installation structure of solar photovoltaic power generation DC-DC converter, including horizontal plate, the connecting plate is arranged in the cavity of horizontal plate, the top of the connecting plate is fixedly connected with converter main body, the top of the converter main body is fixedly connected with heat conduction plate, the top of the heat conduction plate is fixedly connected with the evenly distributed fin;The top of both sides of the horizontal plate is fixedly connected with shell, the inner wall of the shell is fixedly connected with spring, the end of spring away from the inner wall of shell is fixedly connected with moving plate, the side of moving plate away from spring is fixedly connected with transmission plate, the side of transmission plate away from moving plate is fixedly connected with branch plate, the side of branch plate away from transmission plate is movably connected with fixed plate by bearing, the surface of fixed plate is fixedly connected with fixed block;The surface of moving plate is fixedly connected with threaded sleeve, the inner wall of threaded sleeve is threadedly connected with threaded rod, the bottom of threaded rod is fixedly connected with brake plate, converter main body is used to change voltage, to meet the needs of different electrical devices on different cars, heat conduction plate cooperates with fin to be able to efficiently radiate converter main body, avoid converter main body overheating damage, when needing to install converter main body, user moves converter main body and drives connecting plate to move, so that connecting plate enters the cavity of horizontal plate, when connecting plate is completely entered, user rotates fixed plate to the side of converter main body, then, user rotates threaded rod, threaded rod rotates and cooperates threaded sleeve to make brake plate separate from the inner wall of shell, realize to remove the limitation of moving plate, the elastic potential energy of spring drives moving plate to reset, moving plate drives transmission plate to move left, transmission plate drives branch plate to move left, branch plate drives fixed plate and fixed block to move left, until fixed block abuts against converter main body, then, user reversely rotates threaded rod, threaded rod cooperates threaded sleeve to make brake plate recontact with the inner wall of shell, realize to relock moving plate, to realize the installation and fixation of converter main body.

[0008] Preferably, the inner wall of the horizontal plate is provided with a slot, the inner cavity of the slot is inserted with an insertion plate, the surface of the insertion plate is fixedly connected with the surface of the connecting plate, when the connecting plate moves, the insertion plate will move, the insertion plate moves and inserts into the inner cavity of the slot, the slot cooperates with the insertion plate to limit the connecting plate, preventing the connecting plate from moving upward and separating from the inner cavity of the horizontal plate.

[0009] Preferably, the inner wall of the shell is fixedly connected with a sliding rod, the surface of the sliding rod is slidably connected with a sliding sleeve, the surface of the sliding sleeve is fixedly connected with the surface of the moving plate, when the moving plate moves, the sliding sleeve will move, the sliding sleeve can only move on the surface of the sliding rod, the sliding sleeve cooperates with the sliding rod to limit the moving plate, improving the stability of the moving plate when moving up and down.

[0010] Preferably, the top of the shell is fixedly connected with a cover plate, the end of the threaded rod away from the brake plate penetrates to the top of the cover plate and is fixedly connected with a hand wheel, the cover plate is used for sealing the shell, and the hand wheel facilitates the user to rotate the threaded rod.

[0011] Preferably, the top of the cover plate is provided with a through groove matched with the movement of the threaded rod, and the surface of the hand wheel is provided with anti-skid lines, the through groove is used for providing space for the left and right movement of the threaded rod, and the anti-skid lines can prevent the hand wheel from being easily dropped.

[0012] Preferably, the bottom of the horizontal plate is fixedly connected with a bottom plate, both sides of the top of the bottom plate are provided with bolts in penetration, and the threaded end of the bolt is threadedly connected with a nut, so that the bottom plate can install the DC-DC converter mounting structure at a specified position and ensure the stability of the DC-DC converter mounting structure in use.

[0013] Preferably, the top of the bottom plate is provided with through holes which are uniformly distributed and used for matching the bolts, and the shell is provided with a moving groove used for matching the connecting plate on one side.

[0014] Preferably, the bottom of the bottom plate is provided with accommodation grooves on both sides, and the inner wall of the accommodation groove is fixedly connected with an anti-skid pad, so that the accommodation groove is used for accommodating and fixing the anti-skid pad, the anti-skid pad can increase the friction, and the stability of the DC-DC converter mounting structure after being fixed is further improved.

[0015] Preferably, the top of the bottom plate is provided with an auxiliary limiting mechanism, the auxiliary limiting mechanism comprises an electric telescopic rod and a supporting block, the electric telescopic rod is provided in penetration on the top of the bottom plate, the supporting block is fixed on the top of the bottom plate, the output end of the electric telescopic rod is fixedly connected with a first supporting plate, the top of the supporting block is movably connected with a second supporting plate through a rotating rod, the first supporting plate and the second supporting plate are movably connected with a third supporting plate through the rotating rod, the surface of the first supporting plate is movably connected with a fourth supporting plate through the rotating rod, and the top of the second supporting plate and the fourth supporting plate is movably connected with a limiting plate through the rotating rod.

[0016] (Three) beneficial effects

[0017] Compared with the prior art, the utility model provides a DC-DC converter mounting structure for solar photovoltaic power generation, which has the following beneficial effects:

[0018] 1. The installation structure of the DC-DC converter for solar photovoltaic power generation, the user moves the converter main body to drive the connecting plate to move, so that the connecting plate enters the inner cavity of the horizontal plate, when the connecting plate completely enters, the user rotates the fixed plate to one side of the converter main body, then the user rotates the threaded rod, the threaded rod rotates to cooperate with the threaded sleeve to separate the brake plate from the inner wall of the shell, so as to release the limitation of the moving plate, the elastic potential energy of the spring drives the moving plate to reset, the moving plate drives the transmission plate to move left, the transmission plate drives the supporting plate to move left, the supporting plate drives the fixed plate and the fixed block to move left, until the fixed block abuts against the converter main body, then the user reversely rotates the threaded rod, the threaded rod cooperates with the threaded sleeve to make the brake plate contact with the inner wall of the shell again, so as to lock the moving plate again, thereby realizing the installation and fixation of the converter main body, the fixing mode can guarantee the stability of the converter main body after being fixed, and no additional tool is needed during fixation, so that the installation is convenient.

[0019] 2. The installation structure of the DC-DC converter for solar photovoltaic power generation, through cooperation of the threaded rod and the threaded sleeve, the contact between the brake plate and the inner wall of the shell can be conveniently controlled, so as to realize locking and releasing of the moving plate, the position state of each component can be flexibly adjusted as needed during installation and disassembly, so that the operation is smoothly carried out, after installation is completed, a series of operations are carried out to make the fixed block abut against the converter main body, and the brake plate contacts with the inner wall of the shell again to lock the moving plate, so that the converter main body can be effectively fixed in a suitable position, and loosening and displacement of the converter main body during operation due to vibration and other factors are avoided, so that the DC-DC converter in the solar photovoltaic power generation system can stably work. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a whole structure perspective view of the utility model;

[0021] Figure 2 It is an explosion view of the connecting plate and its top structure of the utility model;

[0022] Figure 3 It is an explosion view of the bottom plate and its related structure of the utility model;

[0023] Figure 4 It is a cross-sectional view of the shell of the utility model;

[0024] Figure 5 It is a local structure perspective view of the utility model;

[0025] Figure 6 It is a three-dimensional view of the auxiliary limiting mechanism of the utility model.

[0026] In the figure: 1, the horizontal plate; 2, the connecting plate; 3, the transformer main body; 4, the heat conduction plate; 5, the cooling fin; 6, the shell; 7, the spring; 8, the moving plate; 9, the transmission plate; 10, the support plate; 11, the fixed plate; 12, the fixed block; 13, the threaded sleeve; 14, the threaded rod; 15, the brake plate; 16, the slot; 17, the plug plate; 18, the sliding rod; 19, the sliding sleeve; 20, the cover plate; 21, the bottom plate; 22, the bolt; 23, the nut; 24, the accommodating groove; 25, the non-slip pad; 26, the auxiliary limiting mechanism; 261, the electric telescopic rod; 262, the support block; 263, the first support plate; 264, the second support plate; 265, the third support plate; 266, the fourth support plate; 267, the limiting plate. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0028] Please refer to Figures 1-6The utility model provides a DC-DC converter's mounting structure for solar photovoltaic power generation, including horizontal board 1, the bottom fixed connection of horizontal board 1 is equipped with bottom plate 21, and both sides of the top of bottom plate 21 are penetrated and are equipped with bolt 22, and the threaded end of bolt 22 is threadedly connected with nut 23, and bottom plate 21 cooperates with bolt 22 and nut 23 can install DC-DC converter mounting structure in the specified position, and can guarantee the stability of DC-DC converter mounting structure when using, and the bottom both sides of bottom plate 21 are equipped with the accommodation groove 24 of setting, and the inner fixed connection of accommodation groove 24 is equipped with antiskid pad 25, and accommodation groove 24 is used for accommodating and fixing antiskid pad 25, and antiskid pad 25 can increase friction, further improve the stability of DC-DC converter mounting structure after fixing, and the inner chamber of horizontal board 1 is equipped with connecting plate 2, and the inner wall of horizontal board 1 is equipped with the slot 16 of setting, and the inner chamber of slot 16 is inserted with the plugboard 17, and the surface fixed connection of plugboard 17 surface and connecting plate 2 surface, when connecting plate 2 moves, will drive plugboard 17 to move, and plugboard 17 moves and inserts into the inner chamber of slot 16, and slot 16 cooperates with plugboard 17 can limit connecting plate 2, prevent connecting plate 2 from moving upwards and separating from the inner chamber of horizontal board 1, and the top fixed connection of connecting plate 2 is equipped with converter main part 3, and the top fixed connection of converter main part 3 is equipped with heat conduction plate 4, and the top fixed connection of heat conduction plate 4 is equipped with the even distribution of radiating fin 5, and the top both sides of horizontal board 1 are fixedly connected with shell 6, and the top of bottom plate 21 is equipped with the even distribution of through -hole for cooperation bolt 22 uses, and one side of shell 6 is equipped with the moving groove of cooperation connecting plate 2 uses, and the inner wall of shell 6 is fixedly connected with spring 7, and the end fixedly connected with moving plate 8 of spring 7 away from the inner wall of shell 6, and the inner wall of shell 6 is fixedly connected with slide rod 18, and the surface slidingly connected with slide sleeve 19 of slide rod 18 is fixedly connected with the surface of moving plate 8, when moving plate 8 moves, will drive slide sleeve 19 to move, and slide sleeve 19 can only move on the surface of slide rod 18, and slide sleeve 19 cooperates with slide rod 18 and limits moving plate 8, improves the stability of moving plate 8 when moving up and down, and the side fixedly connected with transmission plate 9 of moving plate 8 away from spring 7, and the side fixedly connected with support plate 10 of transmission plate 9 away from moving plate 8, and the side fixedly connected with fixed plate 11 of support plate 10 away from transmission plate 9 is rotatably connected with fixed block 12 of the surface of fixed plate 11.The surface of the moving plate 8 is fixedly connected with a threaded sleeve 13, the inner wall of the threaded sleeve 13 is threadedly connected with a threaded rod 14, the top of the shell 6 is fixedly connected with a cover plate 20, one end of the threaded rod 14 away from the brake plate 15 penetrates through to the top of the cover plate 20 and is fixedly connected with a hand wheel, the top of the cover plate 20 is provided with a through groove matched with the movement of the threaded rod 14, the surface of the hand wheel is provided with anti-skid lines, the through groove is used for providing space for the left and right movement of the threaded rod 14, the anti-skid lines can prevent the hand wheel from being easily dropped, the cover plate 20 is used for sealing the shell 6, the hand wheel facilitates the user to rotate the threaded rod 14, the bottom of the threaded rod 14 is fixedly connected with the brake plate 15, the converter main body 3 is used for changing the voltage, thereby meeting the needs of different electrical devices on different cars, the heat-conducting plate 4 matched with the radiating fin 5 can efficiently radiate heat for the converter main body 3, so as to avoid overheating and damage of the converter main body 3, when it is necessary to install the converter main body 3, the user moves the converter main body 3 to drive the connecting plate 2 to move, so that the connecting plate 2 enters the inner cavity of the horizontal plate 1, when the connecting plate 2 completely enters, the user rotates the fixed plate 11 to one side of the converter main body 3, then the user rotates the threaded rod 14, the threaded rod 14 rotates to cooperate with the threaded sleeve 13 to make the brake plate 15 separate from the inner wall of the shell 6, so that the movement of the moving plate 8 is released, the elastic potential energy of the spring 7 drives the moving plate 8 to reset, the moving plate 8 drives the transmission plate 9 to move leftwards, the transmission plate 9 drives the branch plate 10 to move leftwards, the branch plate 10 drives the fixed plate 11 and the fixed block 12 to move leftwards, until the fixed block 12 abuts against the converter main body 3, then the user reversely rotates the threaded rod 14, the threaded rod 14 cooperates with the threaded sleeve 13 to make the brake plate 15 recontact the inner wall of the shell 6, so that the moving plate 8 is relocked, thereby achieving the installation and fixation of the converter main body 3, the top of the bottom plate 21 is provided with an auxiliary limiting mechanism 26, the auxiliary limiting mechanism 26 comprises an electric telescopic rod 261 and a supporting block 262, the electric telescopic rod 261 is penetratingly arranged on the top of the bottom plate 21, the supporting block 262 is fixed on the top of the bottom plate 21, the output end of the electric telescopic rod 261 is fixedly connected with a first supporting plate 263, the top of the supporting block 262 is movably connected with a second supporting plate 264 through a rotating rod, the first supporting plate 263 and the second supporting plate 264 are movably connected with a third supporting plate 265 through a rotating rod, the surface of the first supporting plate 263 is movably connected with a fourth supporting plate 266 through a rotating rod, the top of the second supporting plate 264 and the fourth supporting plate 266 is movably connected with a limiting plate 267 through a rotating rod.

[0029] Working principle: the spring 7 is initially in a compressed state, when the transformer body 3 needs to be installed, the user moves the transformer body 3 to drive the connecting plate 2 to move into the cavity of the horizontal plate 1, when the connecting plate 2 is completely entered, the user rotates the fixed plate 11 to one side of the transformer body 3, then the user rotates the threaded rod 14, the threaded rod 14 rotates the threaded sleeve 13 to separate the brake plate 15 from the inner wall of the shell 6, realize the removal of the limit of the moving plate 8, the elastic potential energy of the spring 7 drives the moving plate 8 to reset, the moving plate 8 drives the transmission plate 9 to move left, the transmission plate 9 drives the branch plate 10 to move left, the branch plate 10 drives the fixed plate 11 and the fixed block 12 to move left, until the fixed block 12 abuts against the transformer body 3, then the user reverses the threaded rod 14, the threaded rod 14 cooperates with the threaded sleeve 13 to make the brake plate 15 contact with the inner wall of the shell 6 again, realize the relocking of the moving plate 8, so as to realize the installation and fixation of the transformer body 3, when the transformer body 3 needs to be disassembled and replaced, the user rotates the threaded rod 14, the threaded rod 14 rotates the threaded sleeve 13 to separate the brake plate 15 from the inner wall of the shell 6, realize the removal of the limit of the moving plate 8, then move the threaded rod 14 to drive the moving plate 8 to move right, after moving to the brake position, the user reverses the threaded rod 14, the threaded rod 14 cooperates with the threaded sleeve 13 to make the brake plate 15 contact with the inner wall of the shell 6 again, realize the relocking of the moving plate 8, the user rotates the fixed plate 11 to below the transformer body 3, then the transformer body 3 can be pulled out for maintenance or replacement, the electric telescopic rod 261 is started, the electric telescopic rod 261 works to drive the first support plate 263 to move upward, the first support plate 263 drives the second support plate 264, the third support plate 265 and the fourth support plate 266 to move, the second support plate 264 cooperates with the fourth support plate 266 to drive the limiting plate 267 to extend or fold, when the limiting plate 267 extends, it can assist in limiting the connecting plate 2, thereby improving the stability of the DC-DC converter for solar photovoltaic power generation after being fixed, when the limiting plate 267 is folded, the limitation of the DC-DC converter for solar photovoltaic power generation is removed.

[0030] In summary, the installation structure of the DC-DC converter for solar photovoltaic power generation has clear and relatively simple operation steps for installing or dismounting the converter body 3, and the user can complete the corresponding process by sequentially rotating the threaded rod 14, rotating the fixed plate 11 and other operations, without the need for complex tools or professional skills, facilitating the staff to quickly operate, when the converter body 3 needs to be overhauled or replaced, it can be conveniently extracted, the whole dismounting process is clear, the converter body 3 with problems can be processed in time, reducing the influence time of the power generation system operation caused by equipment failure, through the cooperation of the threaded rod 14 and the threaded sleeve 13, the contact between the brake plate 15 and the inner wall of the shell 6 can be conveniently controlled, and then the locking and releasing of the moving plate 8 are realized, such a structure design makes the position state of each component flexible during installation, fixing and dismounting, ensuring the smooth operation, after installation is completed, a series of operations make the fixed block 12 abut against the converter body 3, and the brake plate 15 re-contacts with the inner wall of the shell 6 to lock the moving plate 8, which can effectively fix the converter body 3 in the appropriate position, avoid loosening and displacement of the converter body 3 during operation due to factors such as vibration, and ensure the stable work of the DC-DC converter in the solar photovoltaic power generation system, the electric telescopic rod 261 is started, the electric telescopic rod 261 drives the first supporting plate 263 to move upwards, the first supporting plate 263 drives the second supporting plate 264, the third supporting plate 265 and the fourth supporting plate 266 to move, the second supporting plate 264 cooperates with the fourth supporting plate 266 to drive the limiting plate 267 to extend or fold, when the limiting plate 267 extends, it can assist in limiting the connecting plate 2, thereby improving the stability of the fixed DC-DC converter for solar photovoltaic power generation, when the limiting plate 267 is folded, the limitation of the DC-DC converter for solar photovoltaic power generation is released.

[0031] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A mounting structure of a DC-DC converter for solar photovoltaic power generation, comprising a horizontal plate (1), characterized in that: The inner cavity of the transverse plate (1) is provided with a connecting plate (2), the top of the connecting plate (2) is fixedly connected with a transformer body (3), the top of the transformer body (3) is fixedly connected with a heat-conducting plate (4), and the top of the heat-conducting plate (4) is fixedly connected with uniformly distributed cooling fins (5). The top of the transverse plate (1) is fixedly connected with a shell (6) on both sides, the inner wall of the shell (6) is fixedly connected with a spring (7), the end of the spring (7) away from the inner wall of the shell (6) is fixedly connected with a moving plate (8), the side of the moving plate (8) away from the spring (7) is fixedly connected with a transmission plate (9), the side of the transmission plate (9) away from the moving plate (8) is fixedly connected with a support plate (10), the side of the support plate (10) away from the transmission plate (9) is movably connected with a fixed plate (11) through a bearing, and the surface of the fixed plate (11) is fixedly connected with a fixed block (12). The surface of the moving plate (8) is fixedly connected with a threaded sleeve (13), the inner wall of the threaded sleeve (13) is threadedly connected with a threaded rod (14), and the bottom of the threaded rod (14) is fixedly connected with a brake plate (15).

2. The mounting structure of a DC-DC converter for solar photovoltaic power generation according to claim 1, characterized in that: The inner wall of the transverse plate (1) is provided with a slot (16), the inner cavity of the slot (16) is inserted with a plug plate (17), and the surface of the plug plate (17) is fixedly connected with the surface of the connecting plate (2).

3. The mounting structure of a DC-DC converter for solar photovoltaic power generation according to claim 1, characterized in that: The inner wall of the shell (6) is fixedly connected with a sliding rod (18), the surface of the sliding rod (18) is slidably connected with a sliding sleeve (19), and the surface of the sliding sleeve (19) is fixedly connected with the surface of the moving plate (8).

4. The mounting structure of a DC-DC converter for solar photovoltaic power generation according to claim 1, characterized in that: The top of the shell (6) is fixedly connected with a cover plate (20), one end of the threaded rod (14) away from the brake plate (15) penetrates through the top of the cover plate (20) and is fixedly connected with a hand wheel.

5. The mounting structure of a DC-DC converter for solar photovoltaic power generation according to claim 4, characterized in that: The top of the cover plate (20) is provided with a through groove matched with the movement of the threaded rod (14), and the surface of the hand wheel is provided with anti-skid lines.

6. The mounting structure of a DC-DC converter for solar photovoltaic power generation according to claim 1, characterized in that: The bottom of the transverse plate (1) is fixedly connected with a bottom plate (21), bolts (22) are penetratingly arranged on both sides of the top of the bottom plate (21), and the threaded ends of the bolts (22) are threadedly connected with nuts (23).

7. The mounting structure of a DC-DC converter for solar photovoltaic power generation according to claim 6, characterized in that: The top of the bottom plate (21) is provided with through holes uniformly distributed and used for matching the bolts (22), and one side of the shell (6) is provided with a moving groove used for matching the connecting plate (2).

8. The mounting structure of a DC-DC converter for solar photovoltaic power generation according to claim 6, characterized in that: The bottom of the bottom plate (21) is provided with accommodation grooves (24) on both sides, and the inner wall of the accommodation groove (24) is fixedly connected with an anti-skid pad (25).

9. The mounting structure of a DC-DC converter for solar photovoltaic power generation according to claim 6, characterized in that: The bottom plate (21) top is provided with auxiliary limiting mechanism (26), auxiliary limiting mechanism (26) includes electric telescopic rod (261) and support block (262), electric telescopic rod (261) is arranged through the top of bottom plate (21), support block (262) is fixed to the top of bottom plate (21), the output end of electric telescopic rod (261) is fixedly connected with first support plate (263), the top of support block (262) is movably connected with second support plate (264) through the hinge rod, the third support plate (265) is movably connected between first support plate (263) and second support plate (264) through the hinge rod, the surface of first support plate (263) is movably connected with fourth support plate (266) through the hinge rod, the top of second support plate (264) and fourth support plate (266) is movably connected with limiting plate (267) through the hinge rod.

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