A skid house for a photovoltaic energy storage system

Abstract

The present application provides a kind of for photovoltaic energy storage system, it is related to pry dress house technical field, including: the front and rear sides of main body are provided with fixed frame, the inside hinged of fixed frame has side fence, the side fence can be turned down along the position of hinged, sensing integrated module can capture internal temperature anomaly and smoke signal in real time, and trigger cylinder control telescopic rod to retract quickly, after releasing the limiting of bolt plate, top rod can push side fence to open, in this way, on the one hand, it is convenient for external rescuers to intuitively and quickly observe the fire location, fire size and burning range inside the main body, and formulate corresponding rescue plan, on the other hand, it can open up fire-fighting rescue operation channel, and quickly contain fire spread, solve the problem that if photovoltaic equipment in pry dress house appears fire, rescue personnel who can not be convenient to judge the fire in pry dress house, so as to make corresponding remedial measures, and closed pry dress house is not convenient for the fire-fighting work of rescue personnel who comes.

Description

Technical Field

[0001] This invention relates to the field of skid-mounted housing technology, and in particular to a skid-mounted housing for a photovoltaic energy storage system. Background Technology

[0002] With the rapid development of new energy technologies, photovoltaic power generation has been widely used in many scenarios such as industrial and commercial power supply, microgrids, independent power supply in remote areas, and emergency backup power, thanks to its advantages of being clean, renewable, and flexible in deployment. In order to solve the defects of intermittency and volatility of photovoltaic power generation, ensure stable power output, realize peak shaving and valley filling, and store and reuse surplus electricity, photovoltaic energy storage integrated systems have become the core supporting equipment in the field of new energy power supply. The photovoltaic energy storage system mainly consists of photovoltaic modules, energy storage battery packs, converters, distribution cabinets, control systems, and heat dissipation and fire protection auxiliary equipment. The entire set of equipment needs to be centrally installed and properly protected in order to ensure long-term stable operation.

[0003] However, there are some shortcomings in the current design of skid-mounted houses: First, most existing skid-mounted houses adopt a fully enclosed box structure. When electrical equipment such as photovoltaic and energy storage inside the house catches fire, external rescuers cannot intuitively and quickly judge the size of the fire, the location of the fire, and the range of the fire inside the box. It is difficult to formulate corresponding rescue and fire-fighting plans. Moreover, the enclosed skid-mounted house is not convenient for the arriving rescuers to carry out fire-fighting work, which increases the difficulty of on-site fire-fighting and rescue operations. It cannot quickly and effectively deal with the fire, which will cause the fire to spread and the equipment damage to be aggravated. Secondly, the existing skid-mounted buildings are enclosed, integrated structures with limited space and a compact layout for equipment installation. When workers dismantle, replace, repair, or install photovoltaic energy storage equipment, their operating space is restricted, and their field of vision is also obstructed. This not only increases the difficulty of equipment operation and maintenance but also reduces the efficiency of the entire photovoltaic energy storage system operation and maintenance, which is not conducive to equipment maintenance. Summary of the Invention

[0004] To address the above problems, one objective of this invention is to overcome these shortcomings, and more specifically, to provide a skid-mounted house for a photovoltaic energy storage system that allows for easy observation of the fire inside the skid-mounted house in the event of a fire, and automatically opens both sides of the skid-mounted house to facilitate firefighting efforts. It also facilitates the replacement or installation of photovoltaic equipment inside the skid-mounted house.

[0005] In a first aspect, the present invention provides a skid-mounted house for a photovoltaic energy storage system, specifically comprising: a main body; the main body being a rectangular cage-like frame structure; mating grooves provided at the two corners of the main body, and top grooves provided on both sides of the top of the main body; a fixing frame provided at the lower interior of the main body, and a fixing rod provided inside the fixing frame; fixing frames provided at the front and rear sides of the main body, with mating blocks symmetrically arranged on both sides of the fixing frames, the mating blocks being inserted into the mating grooves and fixed by screws; side enclosures hinged inside the fixing frames, the side enclosures being able to be flipped downwards along the hinged position, and door panels provided inside the side enclosures; a platform provided at the upper end of the fixing frame, and a bottom block provided at the bottom of the platform, the bottom block being slidably engaged with the fixing rods, the platform being able to extend from the interior of the main body along the fixing rods.

[0006] Preferably, the main body is provided with a fixing plate and a flip plate on both sides respectively. The flip plate can be flipped upward along the upper hinge position. The bottom side of the flip plate is provided with a notch and the flip plate abuts against the side end of the table.

[0007] Preferably, two sets of bolt plates are symmetrically arranged on the side ends of the side enclosure, and the bolt plates are located on the inner side of the main body; two sets of sensor integrated modules are symmetrically arranged on the upper side of the fixed frame, and the sensor integrated module integrates a temperature detection unit and a smoke detection unit.

[0008] Preferably, a cylinder is provided on the side end of the fixed frame near the sensor integrated module. The cylinder is located directly above the bolt plate and is electrically connected to the sensor integrated module. The telescopic rod at the lower end of the cylinder abuts against the bolt plate. When the sensor integrated module is triggered, the cylinder will control the telescopic rod to retract.

[0009] Preferably, the side of the platform is provided with a rectangular protrusion structure, which extends from the notch on the bottom side of the flip plate, and at least two sets of support wheels are installed at the lower end of the rectangular protrusion structure.

[0010] Preferably, a base frame is provided at the lower end of the main body, the base frame is screwed to the bottom of the main body, and an inner plate is provided at the upper end of the inner side of the base frame, the upper end of the inner plate abutting against the fixing frame.

[0011] Preferably, the upper end of the main body is provided with a top plate, and the lower ends of both sides of the top plate are provided with side blocks, which are inserted into the top groove and screwed to the top groove.

[0012] Preferably, two sets of limiting plates are provided on one side of the main body where the flip plate is installed. The limiting plates abut against the upper outer end of the flip plate. A guide rod is fixedly installed on the limiting plate. The guide rod slides with the main body and is T-shaped. The guide rod is located on the inner side of the main body and a C-shaped limiting sleeve is fitted on the guide rod. The two ends of the limiting sleeve abut against the end of the guide rod and the inner wall of the main body, respectively.

[0013] Preferably, the fixed frame is provided with a frame on both sides, with at least one frame on each side. The frame is arranged perpendicular to the side enclosure. A top rod is slidably installed on the frame and abuts against the side enclosure. A spring is provided inside the frame, and the two sides of the spring abut against the top rod and the inner wall of the frame, respectively.

[0014] 1. In this invention, a platform carrying photovoltaic energy storage equipment is set inside the main body, and a flip-up flap is set on the side of the main body to limit the platform. The flap is locked in the flip state by a limiting plate with a T-shaped guide rod and a C-shaped limiting sleeve. When the equipment is installed, disassembled, replaced, or repaired, the staff can enter the main body, remove the limiting sleeve on the guide rod, slide the limiting plate to release the limiting of the flap, and lift the flap so that the platform carrying the equipment can be pulled horizontally out of the main body, so that the photovoltaic energy storage equipment is fully exposed to the open space outside. This can expand the space for operation and maintenance, broaden the field of vision, and make the operation and maintenance work such as disassembly, repair, and replacement of equipment more efficient, effectively reducing the difficulty of operation and maintenance work and improving the daily operation and maintenance efficiency of photovoltaic energy storage system.

[0015] 2. In this invention, fixed frames with side enclosures are installed on the front and rear sides of the main body. The side enclosures are normally locked by the cylinder telescopic rod abutting against the bolt plate. At the same time, an integrated sensing module with both temperature detection and smoke detection functions is integrated on the fixed frame. The cylinder and the integrated sensing module can be electrically linked. When a fire occurs in the photovoltaic energy storage equipment inside the main body, the integrated sensing module can capture abnormal internal temperature and smoke signals in real time and trigger the cylinder to control the telescopic rod to retract quickly. After releasing the limit on the bolt plate, the top rod can push the side enclosure to automatically flip down and open along the hinge position, quickly opening the internal cavity of the main body. This allows external rescue personnel to intuitively and quickly observe the location of the fire, the size of the fire, and the burning range inside the main body, and formulate corresponding rescue plans. On the other hand, it opens up a fire-fighting and rescue operation channel, allowing rescue personnel to quickly contain the spread of the fire and avoid large-scale damage to the equipment. This effectively improves the fire safety level and emergency rescue efficiency of the photovoltaic energy storage skid-mounted house. Attached Figure Description

[0016] In the attached diagram: Figure 1 A three-dimensional structural schematic diagram of an embodiment of the present invention is shown.

[0017] Figure 2 A schematic diagram of the split structure of an embodiment of the present invention is shown.

[0018] Figure 3 A schematic diagram of the internal structure of the main body of an embodiment of the present invention is shown.

[0019] Figure 4 The embodiments of the present invention are shown by Figure 3 This leads to an enlarged structural diagram of part A.

[0020] Figure 5 A schematic diagram of the top structure of the main body according to an embodiment of the present invention is shown.

[0021] Figure 6 A schematic diagram of the planar structure of the main body side end of an embodiment of the present invention is shown.

[0022] Figure 7 A schematic diagram showing the unfolding of the flap and the extension of the platform according to an embodiment of the present invention is provided.

[0023] Figure 8 A three-dimensional structural diagram of the fixed frame according to an embodiment of the present invention is shown.

[0024] Figure 9 A schematic diagram of the main three-dimensional structure of an embodiment of the present invention is shown.

[0025] List of reference numerals 1. Main body; 101. Connecting groove; 102. Top groove; 103. Fixing plate; 104. Flip plate; 105. Fixing frame; 1051. Fixing rod; 2. Fixed frame; 201. Connecting block; 202. Side enclosure; 2021. Door panel; 203. Bolt plate; 204. Sensor integrated module; 205. Cylinder body; 2051. Telescopic rod; 3. Tabletop; 301. Base block; 302. Support casters; 4. Base frame; 401, built-in plate; 5. Top plate; 501. Side block; 6. Limiting plate; 601. Guide rod; 602. Limiting sleeve; 7. Frame; 701. Top rod; 702. Spring. Detailed Implementation

[0026] Example 1: Please refer to Figures 1 to 9 As shown: This invention provides a skid-mounted house for a photovoltaic energy storage system, comprising: a main body 1; the main body 1 is a rectangular cage frame structure; docking grooves 101 are provided at the two corners of the main body 1, and top grooves 102 are provided on both sides of the top of the main body 1; a fixing frame 105 is provided at the lower end of the interior of the main body 1, and a fixing rod 1051 is provided inside the fixing frame 105; fixing frames 2 are provided at the front and rear sides of the main body 1, and docking blocks 201 are symmetrically provided on both sides of the fixing frames 2, the docking blocks 201 are inserted into the docking grooves 101 and fixed by screws; a side enclosure 202 is hinged inside the fixing frame 2, the side enclosure 202 can be flipped downward along the hinge position, and a door panel 2021 is provided inside the side enclosure 202; a platform 3 is provided at the upper end of the fixing frame 105, and a bottom block 301 is provided at the bottom of the platform 3, the bottom block 301 is slidably engaged with the fixing rod 1051, and the platform 3 can extend out from the interior of the main body 1 along the fixing rod 1051.

[0027] As a second embodiment of the present invention, based on the first embodiment, such as Figure 5 , Figure 7 and Figure 9As shown, a fixing plate 103 and a flip plate 104 are respectively provided on both sides of the main body 1. The flip plate 104 can be flipped upward along the upper hinge position. A notch is provided on the bottom side of the flip plate 104, and the flip plate 104 abuts against the side end of the platform 3. A rectangular protrusion structure is provided on the side end of the platform 3. The rectangular protrusion structure extends from the notch on the bottom side of the flip plate 104. At least two sets of support wheels 302 are installed on the lower end of the rectangular protrusion structure. Two sets of limiting plates 6 are provided on the side of the main body 1 where the flip plate 104 is installed. The limiting plates 6 abut against the outer upper end of the flip plate 104. Guides are fixedly installed on the limiting plates 6. A rod 601 is slidably fitted with the main body 1, and the guide rod 601 is T-shaped. The guide rod 601 is located inside the main body 1, and a C-shaped limiting sleeve 602 is fitted on the guide rod 601. The two ends of the limiting sleeve 602 abut against the end of the guide rod 601 and the inner wall of the main body 1, respectively. The main body 1 is provided to prevent the photovoltaic energy storage device from being installed. A docking groove 101 is provided, and by inserting the docking groove 101 and the docking block 201, the fixing frame 2 can be fixed at the side end of the main body 1. A top groove 102 is provided, and by inserting and fixing the side block 501 into the top groove 102, the fixing frame 2 can be fixed at the side end of the main body 1. The top plate 5 is fixed to the upper end of the main body 1; a fixing plate 103 is provided to close the side of the main body 1; a flip plate 104 is provided to limit the position of the platform 3; a fixing frame 105 is provided to slide the platform 3 into the main body 1; a fixing rod 1051 is provided to allow the platform 3 to slide horizontally along the fixing rod 1051 on the fixing frame 105; the platform 3 is provided to support the photovoltaic equipment inside the main body 1; a bottom block 301 is provided to allow the platform 3 to slide with the fixing frame 105; and a support is provided. Wheel 302 supports the platform 3; a limiting plate 6 is provided to limit the flap 104 within the main body 1; a guide rod 601 is provided to allow the limiting plate 6 to slide on the main body 1; a limiting sleeve 602 is provided, which limits the limiting plate 6 by fitting the limiting sleeve 602 into the guide rod 601. By setting the guide rod 601 inside the main body 1, the limiting sleeve 602 cannot be removed from the outside of the main body 1. Only after the staff enters the inside of the main body 1 can the limiting sleeve 602 be removed, thus preventing others from opening the flap 104 at will.

[0028] This application involves sliding a platform 3 capable of supporting photovoltaic energy storage equipment inside the main body 1. A flip plate 104 is abutted against the side end of the platform 3, and a limiting plate 6 abuts and limits the flip plate 104. When it is necessary to replace or install equipment inside the main body 1, the staff can enter the interior of the main body 1 through the door panel 2021. Inside the main body 1, the limiting sleeves 602 on the two sets of guide rods 601 are removed. Then, the two sets of limiting plates 6 are moved to the side end of the main body 1, and the limiting plate 3 is no longer limited. After the flip plate 104 is lifted, the limiting plate 6 is pushed back, and the flip plate 104 is placed on the limiting plate 6. At this time, the platform 3 can be pulled out from the inside of the main body 1, and the photovoltaic equipment can be replaced and installed on the extended platform 3. After the work is completed, the platform 3 can be pushed back, and the flip plate 104 can be restored.

[0029] As a third embodiment of the present invention, based on embodiment one, such as Figure 6 and Figure 8As shown, two sets of bolt plates 203 are symmetrically arranged on the side end of the side enclosure 202, and the bolt plates 203 are located inside the main body 1; two sets of sensor integrated modules 204 are symmetrically arranged on the upper side of the fixed frame 2, and the sensor integrated module 204 integrates a temperature detection unit and a smoke detection unit; a cylinder 205 is arranged on the side end of the fixed frame 2 near the sensor integrated module 204, the cylinder 205 is located directly above the bolt plate 203, and the cylinder 205 is electrically connected to the sensor integrated module 204, and the telescopic rod 2051 at the lower end of the cylinder 205 abuts against the bolt plate 203, and the sensor integrated module 205... When triggered, cylinder 205 controls telescopic rod 2051 to retract; a frame 7 is provided on both sides of the fixed frame 2, with at least one frame 7 on each side. The frame 7 is arranged perpendicularly to the side enclosure 202. A top rod 701 is slidably installed on the frame 7, and the top rod 701 abuts against the side enclosure 202. A spring 702 is provided inside the frame 7, and the two sides of the spring 702 abut against the top rod 701 and the inner wall of the frame 7, respectively; the side enclosure 202 is provided, and a door panel 2021 can be installed inside the side enclosure 202. A lockable door panel 2021 is provided, allowing workers to enter through the door panel 2021. Inside the main body 1, inspections or routine maintenance of the photovoltaic energy storage equipment are carried out; a bolt plate 203 is installed, and by abutting the telescopic rod 2051 against the bolt plate 203, the telescopic rod 2051 is positioned between the bolt plate 203 and the side enclosure 202, which can limit and fix the side enclosure 202 on the fixed frame 2; an induction integrated module 204 is installed, which can detect the internal temperature of the main body 1 in real time and whether smoke is generated due to combustion, and trigger the cylinder 205 when a fire occurs. Moreover, by setting independently operable induction integrated modules 204 on both sides of the fixed frame 2, it can avoid To avoid the situation where the cylinder 205 controls the retraction of the telescopic rod 2051 due to the excessive sensitivity of a single sensing integrated module 204, the monitoring accuracy of the fire can be improved; the cylinder 205 is set so that after the telescopic rod 2051 is abutted against the bolt plate 203, the side enclosure 202 can be limited to the upper limit of the fixed frame 2; the frame 7 is set so that the top rod 701 can be slidably installed in the frame 7; the top rod 701 is set so that when the telescopic rod 2051 loses its limit on the bolt plate 203, the top rod 701 can push the side enclosure 202 to flip open at the side end of the main body 1.

[0030] This application provides a fixed frame 2 with a side enclosure 202 at the side end of the main body 1. The telescopic rod 2051 of the cylinder 205 is connected to the bolt plate 203, and the side enclosure 202 is locked at the upper limit of the fixed frame 2. When a fire occurs in the photovoltaic equipment inside the main body 1, the sensing integrated module 204 can detect the fire in time through the temperature sensing unit or the smoke sensing unit, and send a command to the cylinder 205 to retract the telescopic rod 2051. After the bolt plate 203 is no longer restricted, the top rod 701 on the frame 7 pushes the side enclosure 202 to flip down autonomously, exposing the inside of the main body 1. This makes it easier for people to discover the fire in time and take appropriate action, and also makes it easier for rescuers to judge the fire situation inside the main body 1 and carry out firefighting work.

[0031] In embodiments of the present invention, such as Figure 3 As shown, a base frame 4 is provided at the lower end of the main body 1. The base frame 4 is screwed to the bottom of the main body 1. An internal plate 401 is provided at the upper end of the base frame 4. The upper end of the internal plate 401 abuts against the fixing frame 105. A top plate 5 is provided at the upper end of the main body 1. Side blocks 501 are provided at the lower ends of both sides of the top plate 5. The side blocks 501 are inserted into the top groove 102 and screwed to the top groove 102. The base frame 4 can support the main body 1. The internal plate 401 can close the bottom of the main body 1. The top plate 5 can close the upper end of the main body 1. The side blocks 501 can fix the top plate 5 to the main body 1.

[0032] The specific usage and function of this embodiment are as follows: In this invention, such as Figures 1 to 9As shown, the photovoltaic equipment is installed on the platform 3 inside the main body 1. The hinged flap 104 on the side of the main body 1 abuts against the side of the platform 3 and limits the position of the platform 3. The limiting plate 6 on the inside of the main body 1 is attached to the upper end of the flap 104. When it is necessary to disassemble, replace, repair and maintain the photovoltaic energy storage equipment inside the main body 1, the staff can enter the interior of the main body 1 through the door panel 2021 inside the side enclosure 202, remove the limiting sleeve 602 on the guide rod 601 and release the positioning restriction of the limiting plate 6. The limiting plate 6 is slid and displaced towards the side of the main body 1 to release the limiting plate 6 from the contact limit of the flip plate 104. After flipping the flip plate 104 upward, the limiting plate 6 is slid again and the limiting flip plate 104 is placed on the limiting plate 6. Then, through the support wheel 302 at the lower end of the platform 3 and the sliding of the base block 301 and the fixing rod 1051, the platform 3 and the photovoltaic energy storage equipment mounted on it are pulled horizontally out of the main body 1. The disassembly, assembly and maintenance of the equipment are completed in the open space outside. After the operation is completed, Then push the platform 3 back into the main body 1, and reset the flip plate 104, the limiting plate 6, and the limiting sleeve 602 in sequence to restore the equipment to its normal stored and fixed state. When a fire occurs in the photovoltaic energy storage equipment inside the main body 1, the multiple sets of induction integrated modules 204 symmetrically arranged on the fixed frame 2 can collect internal environmental data in real time through the built-in temperature detection unit and smoke detection unit. After accurately identifying the abnormal fire situation, the cylinder 205 at the corresponding position is electrically triggered, controlling the telescopic rod 2051 at the lower end of the cylinder 205 to retract upward. When the telescopic rod 2051 contacts the bolt plate 203, the spring 702 inside the frame 7 pushes the top rod 701, which in turn pushes the side enclosure 202 to automatically flip downwards and open along the hinge position, quickly opening the internal cavity of the main body 1. This allows rescue personnel to directly observe the fire and carry out firefighting and rescue operations. After the fire is dealt with, the side enclosure 202 can be manually reset, and the telescopic rod 2051 can be re-engaged with the bolt plate 203 to complete the locking and restore the skid-mounted house to its sealed operation state.

Claims

1. A skid-mounted building for a photovoltaic energy storage system, comprising: Main body (1); the main body (1) is a rectangular cage frame structure; characterized in that, the two side corners of the main body (1) are provided with docking grooves (101), and the top two sides of the main body (1) are provided with top grooves (102), the lower end of the interior of the main body (1) is provided with a fixing frame (105), and the interior of the fixing frame (105) is provided with a fixing rod (1051); the front and rear sides of the main body (1) are provided with fixing frames (2), and the two sides of the fixing frames (2) are symmetrically provided with docking blocks (201), and the docking blocks (201) are docked with the docking blocks (201). The slot (101) is inserted and fixed by screws. The inside of the fixed frame (2) is hinged with a side enclosure (202). The side enclosure (202) can be flipped down along the hinge position. The inside of the side enclosure (202) is provided with a door panel (2021). The upper end of the fixed frame (105) is provided with a platform (3). The bottom of the platform (3) is provided with a bottom block (301). The bottom block (301) is slidably engaged with the fixed rod (1051). The platform (3) can extend from the inside of the main body (1) along the fixed rod (1051).

2. A skid-mounted house for a photovoltaic energy storage system according to claim 1, characterized in that: The main body (1) is provided with a fixing plate (103) and a flip plate (104) on both sides respectively. The flip plate (104) can be flipped upward along the upper hinge position. The bottom side of the flip plate (104) is provided with a notch, and the flip plate (104) abuts against the side end of the platform (3).

3. A skid-mounted house for a photovoltaic energy storage system according to claim 1, characterized in that: The side enclosure (202) is symmetrically provided with two sets of bolt plates (203) on its side end, and the bolt plates (203) are located inside the main body (1); the upper side of the fixed frame (2) is symmetrically provided with two sets of sensing integrated modules (204), and the sensing integrated modules (204) integrate a temperature detection unit and a smoke detection unit.

4. A skid-mounted house for a photovoltaic energy storage system according to claim 3, characterized in that: A cylinder (205) is provided on the side of the fixed frame (2) near the sensing integrated module (204). The cylinder (205) is located at the top of the bolt plate (203) and is electrically connected to the sensing integrated module (204). The telescopic rod (2051) at the lower end of the cylinder (205) abuts against the bolt plate (203). When the sensing integrated module (204) is triggered, the cylinder (205) will control the telescopic rod (2051) to retract.

5. A skid-mounted house for a photovoltaic energy storage system according to claim 2, characterized in that: The side end of the platform (3) is provided with a rectangular protrusion structure. The rectangular protrusion structure extends from the notch on the bottom side of the flip plate (104). At least two sets of support wheels (302) are installed at the lower end of the rectangular protrusion structure.

6. A skid-mounted house for a photovoltaic energy storage system according to claim 1, characterized in that: The lower end of the main body (1) is provided with a base frame (4), which is screwed to the bottom of the main body (1). The upper end of the base frame (4) is provided with an internal plate (401), and the upper end of the internal plate (401) abuts against the fixing frame (105).

7. A skid-mounted house for a photovoltaic energy storage system according to claim 1, characterized in that: The upper end of the main body (1) is provided with a top plate (5), and the lower ends of both sides of the top plate (5) are provided with side blocks (501). The side blocks (501) are inserted into the top groove (102) and the side blocks (501) are screwed into the top groove (102).

8. A skid-mounted house for a photovoltaic energy storage system according to claim 2, characterized in that: Two sets of limiting plates (6) are provided on one side of the main body (1) where the flip plate (104) is installed. The limiting plate (6) abuts against the upper outer end of the flip plate (104). A guide rod (601) is fixedly installed on the limiting plate (6). The guide rod (601) slides with the main body (1). The guide rod (601) is T-shaped and located inside the main body (1). A C-shaped limiting sleeve (602) is fitted on the guide rod (601). The two ends of the limiting sleeve (602) abut against the end of the guide rod (601) and the inner wall of the main body (1), respectively.

9. A skid-mounted house for a photovoltaic energy storage system according to claim 1, characterized in that: The fixed frame (2) is provided with a frame (7) on both sides, with at least one frame (7) on each side. The frame (7) is arranged perpendicularly to the side enclosure (202). A top rod (701) is slidably installed on the frame (7). The top rod (701) abuts against the side enclosure (202). A spring (702) is provided inside the frame (7). The two sides of the spring (702) abut against the top rod (701) and the inner wall of the frame (7), respectively.

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