Photovoltaic energy storage integrated power supply storage box

Abstract

The invention relates to a power supply storage box, belongs to the technical field of photovoltaic energy storage integrated power supplies, and particularly relates to a photovoltaic energy storage integrated power supply storage box. According to the device, through cooperation of a motor, a two-way screw, a threaded plate, a telescopic frame, a connecting column, a fixing frame, a sliding frame and a mounting frame, the distance between the three containing plates can be rapidly adjusted, components can be conveniently mounted and overhauled, and through cooperation of a sliding plate, a fixing sleeve, an air inlet pipe, a first one-way valve, a piston plate, a second one-way valve, a moving rod, a cleaning box, a brush and a spraying hole, the cleaning efficiency is improved. A filter screen is cleaned through a brush, floating dust on the filter screen is blown away through spray holes, the filter screen is prevented from being blocked, and heat dissipation in the device is prevented from being affected, and through cooperation of a fan, a ventilation pipe, a through hole, a moving box, a connecting pipe, a first air inlet groove, a second air inlet groove and heat dissipation holes, heat dissipation is conducted on the bottoms of components while heat dissipation is conducted on the two sides of the box body, and the heat dissipation efficiency is improved. And the heat dissipation effect of the device is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic energy storage integrated power supply, in particular to a photovoltaic energy storage integrated power supply storage box. Background Art

[0002] The photovoltaic energy storage integrated power storage box (or integrated distribution box) is the core supporting equipment of the photovoltaic power generation system. Its function is to ensure the efficient and stable operation of the photovoltaic energy storage system through safe integration, centralized management and intelligent control of key electrical equipment.

[0003] The Chinese patent with announcement number CN219980210U discloses a household photovoltaic energy storage integrated power storage box, including a box body, a cooling pipe is provided on the rear side of the outer wall of the box body, both ends of the cooling pipe are respectively installed on the connection port of the refrigeration compressor, an insulation layer is provided on the outside of the cooling pipe, and an installation cover is provided on the outside of the insulation layer. This patent realizes convection heat dissipation by starting the operation of the fan, sucking air from the blinds and exhausting it at the fan port. At the same time, by starting the refrigeration compressor, the refrigerant circulates in the cooling pipe, absorbing heat in the chassis, and achieving the effect of assisting in cooling the internal temperature of the chassis to protect the normal operation of the electrical components. The inhaled air is dusted and dried by the replaceable filter element, thereby achieving the protection of the working stability and safety of the electrical components, and also achieving the effect of cleaning the inside of the box.

[0004] The above technical solution achieves heat dissipation through forced convection of the fan (air intake from the louvers and exhaust from the fan outlet) in conjunction with the refrigeration cycle of the refrigeration compressor. However, this heat dissipation design has obvious defects:

[0005] The air intake and exhaust ducts are easily clogged: The louvers that serve as the main air intake and the protective covers on the outside are easily clogged with dust after long-term use, seriously hindering the smooth intake and exhaust of air, resulting in a significant reduction in the forced convection cooling efficiency;

[0006] Poor heat dissipation at the bottom of the power storage unit: The power storage unit is placed directly on the second partition, and there is a lack of effective heat dissipation space or channel between its bottom and the partition, which makes it difficult to dissipate the heat generated by the power supply at the bottom, resulting in local heat accumulation. These two defects are superimposed on each other, ultimately leading to a decrease in the overall heat dissipation efficiency inside the box, posing a risk of local overheating, and making it difficult to ensure the long-term efficient, stable and safe operation of electrical components (especially the power storage unit).

[0007] Based on this, the present invention proposes a photovoltaic energy storage integrated power supply storage box. Summary of the Invention

[0008] In order to solve the above technical problems, the present invention proposes a photovoltaic energy storage integrated power supply storage box, which can drive the cleaning box to move through the telescopic frame, clean the filter screen through the brush and spray hole, and adjust the spacing of the placement plates through the telescopic frame to facilitate the installation and maintenance of components. The bottom of the component is dissipated by the air intake groove 1, the air intake groove 2 and the heat dissipation hole, and the ventilation pipe and the through hole are used to dissipate heat on both sides of the component, which greatly improves the heat dissipation effect of the device.

[0009] The technical solution for achieving the purpose of the present invention is as follows: a photovoltaic energy storage integrated power supply storage box, comprising a box body, a protective door hinged on the box body, a base and two fixed frames fixedly connected to the box body, two filters fixedly connected to the two fixed frames, two threaded plates slidably connected to the box body, two telescopic frames rotatably connected to the two threaded plates, a plurality of connecting columns respectively rotatably connected to the two telescopic frames, and a plurality of cleaning boxes respectively fixedly connected to the plurality of connecting columns, and further comprising;

[0010] A sliding plate, multiple sliding plates are slidably connected to the box body, multiple sliding plates are respectively fixedly connected with multiple fixing sleeves, multiple fixed sleeves are respectively fixedly connected with multiple air intake pipes, multiple air intake pipes are respectively provided with multiple one-way valves 1, multiple fixed sleeves are respectively slidably connected with multiple piston plates, multiple piston plates are respectively provided with multiple one-way valves 2, multiple piston plates are respectively fixedly connected with multiple moving rods, multiple moving rods are respectively fixedly connected to multiple cleaning boxes, multiple moving rods are respectively provided with multiple through grooves, multiple cleaning boxes are respectively fixedly connected with multiple brushes, and multiple cleaning boxes are respectively provided with multiple spray holes.

[0011] Preferably, three installation frames are slidably connected to the box body, a plurality of sliding grooves are respectively opened on the three installation frames, a plurality of connecting columns are respectively arranged in the plurality of sliding grooves, three placement plates are slidably connected to the three installation frames, and a plurality of limit bars are respectively fixedly connected to the three placement plates.

[0012] Preferably, a motor is fixedly connected to the box body, a bidirectional screw is fixedly connected to the output shaft of the motor, both ends of the bidirectional screw are respectively threadedly connected to two threaded plates, the tops of the two telescopic frames are respectively rotatably connected to two sliding frames, two fixed frames are fixedly connected to the box body, and the two sliding frames are respectively slidably connected to the two fixed frames.

[0013] Preferably, a fan is fixedly connected to the box body, and two ventilation pipes are fixedly connected to the output end of the fan, and a plurality of through holes are respectively opened on the two ventilation pipes.

[0014] Preferably, a plurality of movable boxes are slidably connected to the two ventilation pipes respectively, a plurality of connecting pipes are fixedly connected to the plurality of movable boxes respectively, and the plurality of connecting pipes are fixedly connected to a plurality of mounting frames respectively.

[0015] Preferably, three air inlet grooves 1 and three air inlet grooves 2 are respectively opened on the three placement plates, the three air inlet grooves 1 are respectively connected to three of the connecting pipes, and the three air inlet grooves 2 are respectively connected to the other three connecting pipes.

[0016] Preferably, a plurality of heat dissipation holes are respectively opened on the three placement plates, and the plurality of heat dissipation holes are respectively connected to the three air inlet slots 1 and the three air inlet slots 2, and a plurality of protrusions are fixedly connected to the three placement plates.

[0017] Preferably, the three installation frames and the three placement plates are each provided with a plurality of limiting grooves, and a sliding rod is slidably connected to the box body.

[0018] Preferably, two springs are fixedly connected to the sliding rod, and the two springs are fixedly connected to the box body. A plurality of limit plates are fixedly connected to the sliding rod, and the plurality of limit plates are respectively adapted to the plurality of limit slots.

[0019] Compared with the prior art, the present invention has the following significant advantages:

[0020] First, in the present invention, the spacing between the three placement plates can be quickly adjusted by cooperating with the motor, bidirectional screw, threaded plate, telescopic frame, connecting column, fixed frame, sliding frame and mounting frame, facilitating the installation and maintenance of components.

[0021] Second, in the present invention, the sliding plate, the fixed sleeve, the air inlet pipe, the first one-way valve, the piston plate, the second one-way valve, the movable rod, the cleaning box, the brush and the spray hole cooperate to clean the filter with the brush and blow away the dust on the filter with the spray hole, thereby preventing the filter from being clogged and affecting the heat dissipation inside the device.

[0022] Thirdly, in the present invention, the fan, ventilation pipe, through hole, movable box, connecting pipe, air inlet groove 1, air inlet groove 2 and heat dissipation hole cooperate to dissipate heat from both sides of the box body and the bottom of the components, thereby greatly improving the heat dissipation effect of the device;

[0023] Fourthly, in the present invention, the placement plate is limited by the cooperation of the limiting groove, the sliding rod, the spring and the limiting plate, so as to prevent the placement plate from shaking during the movement of the installation frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further explained below in conjunction with the accompanying drawings and examples:

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the internal three-dimensional structure of the box body of the present invention;

[0027] Figure 3 It is a top view of the cross-sectional structure of the present invention;

[0028] Figure 4 It is a schematic diagram of the three-dimensional structure of the telescopic frame and the cleaning box in the present invention;

[0029] Figure 5 It is a schematic diagram of the three-dimensional structure of the sliding rod and the limiting plate in the present invention;

[0030] Figure 6 It is a front view cross-sectional structural diagram of the present invention;

[0031] Figure 7 It is a left-side sectional structural cross-sectional view of the present invention;

[0032] Figure 8 yes Figure 3 A magnified view of the structure of part A;

[0033] Figure 9 yes Figure 6 A magnified view of the structure of part B;

[0034] Figure 10 yes Figure 7 A magnified view of the structure of part C.

[0035] Description of reference numerals:

[0036] 1. Box body; 2. Protective door; 3. Base; 4. Fixed frame; 5. Filter; 6. Motor; 7. Bidirectional screw; 8. Threaded plate; 9. Telescopic frame; 10. Connecting column; 11. Fixed frame; 12. Sliding frame; 13. Mounting frame; 14. Slide groove; 15. Placement plate; 16. Limit strip; 17. Fan; 18. Ventilation pipe; 19. Through hole; 20. Moving box; 21. Connecting pipe; 22. Air inlet slot 1; 23. Air inlet slot 2; 24. Heat dissipation hole; 25. Bump; 26. Sliding plate; 27. Fixed sleeve; 28. Air inlet pipe; 29. ​​One-way valve 1; 30. Piston plate; 31. One-way valve 2; 32. Moving rod; 33. Through groove; 34. Cleaning box; 35. Brush; 36. Spray hole; 37. Limit groove; 38. Sliding rod; 39. Spring; 40. Limit plate. DETAILED DESCRIPTION

[0037] The present invention is described in detail below, clearly and completely describing the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0038] The present invention provides an improved photovoltaic energy storage integrated power supply storage box. The technical solution of the present invention is:

[0039] like Figures 1-10 As shown, a photovoltaic energy storage integrated power supply storage box includes a box body 1, a protective door 2 is hinged on the box body 1, a base 3 and two fixed frames 4 are fixedly connected to the box body 1, and the base 3 is provided to prevent the box body 1 from directly contacting the ground and easily being contaminated by moisture. Two filters 5 are fixedly connected to the two fixed frames 4 respectively, and two threaded plates 8 are slidably connected to the box body 1. Two telescopic frames 9 are rotatably connected to the two threaded plates 8. A plurality of connecting columns 10 are respectively rotatably connected to the two telescopic frames 9. The connecting columns 10 are equidistantly arranged on the telescopic frames 9, and a plurality of cleaning boxes 34 are respectively fixedly connected to the plurality of connecting columns 10.

[0040] Sliding plates 26, multiple sliding plates 26 are slidably connected to the box body 1, multiple sliding plates 26 are respectively fixedly connected to multiple fixing sleeves 27, multiple fixing sleeves 27 are respectively fixedly connected to multiple air intake pipes 28, multiple air intake pipes 28 are respectively provided with multiple one-way valves 29, the setting of the one-way valve 29 makes it possible for air to only enter the fixing sleeve 27 from the air intake pipe 28, and cannot be discharged from the fixing sleeve 27 along the air intake pipe 28, multiple fixing sleeves 27 are respectively slidably connected to multiple piston plates 30, multiple piston plates 30 are respectively provided with multiple one-way valves 2 31, the setting of the one-way valve 2 31 makes it possible for air to only enter the fixing sleeve 27 from the air intake pipe 28, and cannot be discharged from the fixing sleeve 27 along the air intake pipe 28. It is possible to enter the cleaning box 34 from the fixed sleeve 27 along the through groove 33, but it is impossible to enter the fixed sleeve 27 from the cleaning box 34. Multiple piston plates 30 are respectively fixedly connected to multiple moving rods 32, and multiple moving rods 32 are respectively fixedly connected to multiple cleaning boxes 34. Multiple moving rods 32 are respectively provided with multiple through grooves 33, and multiple cleaning boxes 34 are respectively fixedly connected with multiple brushes 35. Multiple cleaning boxes 34 are respectively provided with multiple spray holes 36. The brushes 35 are used to clean the filter 5, and the spray holes 36 are used to blow away the dust on the filter 5 to avoid clogging of the filter 5 and affecting the heat dissipation inside the device.

[0041] Further, such as Figure 2-Figure 6As shown, three mounting frames 3 are slidingly connected in the box body 1, and the cross-section of the mounting frame 13 is "U"-shaped. A plurality of slide grooves 14 are respectively provided on the three mounting frames 13, and a plurality of connecting columns 10 are respectively provided in the plurality of slide grooves 14. The diameter of the connecting column 10 is equal to the height of the slide groove 14. Three placement plates 15 are slidingly connected to the three mounting frames 13, and a plurality of limit bars 16 are fixedly connected to the three placement plates 15. By setting the limit bars 16, the placement plates 15 are prevented from being completely withdrawn from the mounting frame 13. The telescopic frame 9 is squeezed by the threaded plate 8 to extend the telescopic frame 9. The spacing between the three placement plates 15 can be quickly adjusted, which is convenient for the installation and maintenance of components.

[0042] Further, such as Figure 2-Figure 7 As shown, a motor 6 is fixed in the box body 1 by bolts, and a bidirectional screw 7 is fixed to the output shaft of the motor 6 through a coupling. The two ends of the bidirectional screw 7 are respectively threadedly connected to the two threaded plates 8. The bidirectional screw 7 is used to drive the threaded plates 8 to move toward or away from each other, driving the telescopic frame 9 to extend or contract, thereby realizing the adjustment of the spacing between the three placement plates 15. The tops of the two telescopic frames 9 are respectively rotatably connected to two sliding frames 12. The cross-section of the sliding frame 12 is an inverted "U" shape. The two sliding frames 12 are symmetrical with the placement plate 15 as the axis. Two fixed frames 11 are fixedly connected in the box body 1, and the two sliding frames 12 are respectively slidably connected to the two fixed frames 11.

[0043] Further, such as Figures 1-9 As shown, a fan 17 is fixed to the box body 1 by bolts, and two ventilation pipes 18 are fixedly connected to the output end of the fan 17. The two ventilation pipes 18 are respectively provided with a plurality of through holes 19, and the through holes 19 are staggered on the ventilation pipes 18.

[0044] Further, such as Figure 2-Figure 9 As shown, multiple mobile boxes 20 are respectively slidably connected to the two ventilation pipes 18. The mobile boxes 20 are hollow structures. Under the action of the through holes 19, the ventilation pipes 18, the mobile boxes 20 and the connecting pipes 21 are connected. When the fan 17 draws in air, part of the air will enter the connecting pipes 21. Multiple connecting pipes 21 are respectively fixedly connected to the multiple mobile boxes 20, and the multiple connecting pipes 21 are respectively fixedly connected to the multiple mounting frames 13.

[0045] Further, such as Figure 3 and Figure 9 As shown, three air inlet grooves 1 22 and three air inlet grooves 2 23 are respectively provided on the three placement plates 15. When the placement plates 15 are located in the installation frame 13, the three air inlet grooves 1 22 are respectively connected to three of the connecting pipes 21, and the three air inlet grooves 23 are respectively connected to the other three connecting pipes 21, so that the air drawn in by the fan 17 will enter the air inlet groove 1 22 and the air inlet groove 2 23.

[0046] Further, such as Figure 2-Figure 6 As shown, a plurality of heat dissipation holes 24 are respectively provided on the three placement plates 15, and the plurality of heat dissipation holes 24 are respectively connected to the three air inlet slots 1 22 and the three air inlet slots 2 23. The heat is dissipated to both sides of the box body 1 through the ventilation pipe 18 and the through hole 19, and the heat is dissipated to the bottom of the components through the heat dissipation holes 24, which greatly improves the heat dissipation effect of the device. A plurality of protrusions 25 are fixedly connected to the three placement plates 15, and the protrusions 25 prevent the bottom of the components from directly contacting the placement plates 15 to affect the heat dissipation.

[0047] Further, such as Figure 2-Figure 5 As shown, a plurality of limit grooves 37 are provided on the three mounting frames 13 and the three placement plates 15 , and a sliding rod 38 is slidably connected in the box body 1 . The cross section of the sliding rod 38 is "U"-shaped, and the length of the sliding rod 38 is greater than the length of the placement plate 15 .

[0048] Further, such as Figure 2 and Figure 5 As shown, two springs 39 are fixedly connected to the sliding rod 38, and the two springs 39 are fixedly connected to the box body 1. A plurality of limit plates 40 are fixedly connected to the sliding rod 38, and the cross-section of the limit plates 40 is "T"-shaped. The plurality of limit plates 40 are respectively adapted to the plurality of limit grooves 37. The placement plate 15 is limited by the limit plates 40 to prevent the placement plate 15 from shaking during the movement of the installation frame 13.

[0049] The specific working method is as follows: open the protective door 2, start the motor 6, and its output shaft drives the bidirectional screw 7 to rotate. Since the two threaded plates 8 are threadedly connected to the two ends of the bidirectional screw 7, the threaded plates 8 move inward as the bidirectional screw 7 rotates, squeezing the bottom of the telescopic frame 9, so that the telescopic frame 9 extends, driving the connecting column 10 to move upward. Since the connecting column 10 is located in the slide groove 14 of the installation frame 13, the installation frame 13 moves as the telescopic frame 9 extends, so that the spacing between the three placement plates 15 becomes larger, which is convenient for installing components, and then push the sliding rod 3 8 moves upward, driving the limit plate 40 to move upward, so that the limit plate 40 is away from the limit groove 37, and the restriction on the placement plate 15 is released. At this time, the placement plate 15 can be pulled toward the outside of the box body 1, so that the placement plate 15 moves out of the box body 1, and the components can be placed on the protrusion 25. Then, the components are fixed on the placement plate 15 by bolts, and then the placement plate 15 is pushed to reset and embedded in the installation frame 13. The sliding rod 38 is released. The sliding rod 38 moves downward under the action of the spring 39, driving the limit plate 40 to re-embed into the limit groove 37, and the placement plate 15 is fixed. To prevent the placement plate 15 from shaking during the movement of the installation frame 13, the telescopic frame 9 drives the cleaning box 34 to move while moving, and the brush 35 on it will clean the filter 5. When the moving rod 32 moves inward with the cleaning box 34, it drives the piston plate 30 to move, and the air is drawn into the fixed sleeve 27 along the air inlet pipe 28 and the one-way valve 1 29. When the moving rod 32 moves outward with the cleaning box 34, it drives the piston plate 30 to move, squeezing the air in the fixed sleeve 27, so that the air enters the cleaning box 34 along the one-way valve 2 31 and the through groove 33. Then the air is sprayed out from the nozzle 36 to blow off the dust on the filter 5 to prevent the filter 5 from being blocked by too much dust. When the internal part of the device needs to be cooled, the fan 17 is started, and the fan 17 draws air into the ventilation pipe 18. Part of the air flows out of the ventilation pipe 18 along the through hole 19 to dissipate heat on both sides of the interior of the box 1. Part of the air will enter the mobile box 20, follow the connecting pipe 21 into the air inlet groove 1 22 or the air inlet groove 2 23, and then flow out from the heat dissipation hole 24 to dissipate heat to the base 3 of the component, thereby greatly improving the heat dissipation effect of the device.

[0050] The technical means disclosed in the solution of the present invention are not limited to the technical means disclosed in the above technical means, but also include technical solutions composed of equivalent replacements of the above technical features. Matters not covered in the present invention belong to the common knowledge of those skilled in the art.

Claims

1. A photovoltaic energy storage integrated power supply storage box, comprising a box body (1), a protective door (2) hinged on the box body (1), a base (3) and two fixed frames (4) fixedly connected to the box body (1), two filters (5) fixedly connected in the two fixed frames (4), characterized in that: Two threaded plates (8) are slidably connected in the box body (1), two telescopic frames (9) are rotatably connected to the two threaded plates (8), a plurality of connecting columns (10) are rotatably connected to the two telescopic frames (9), and a plurality of cleaning boxes (34) are fixedly connected to the plurality of connecting columns (10), and further comprising; A sliding plate (26), wherein the plurality of sliding plates (26) are slidably connected to the box body (1), the plurality of sliding plates (26) are respectively fixedly connected with a plurality of fixed sleeves (27), the plurality of fixed sleeves (27) are respectively fixedly connected with a plurality of air intake pipes (28), the plurality of air intake pipes (28) are respectively provided with a plurality of one-way valves (29), the plurality of fixed sleeves (27) are respectively slidably connected with a plurality of piston plates (30), the plurality of piston plates (30) are respectively provided with a plurality of one-way valves (31), the plurality of piston plates (30) are respectively fixedly connected with a plurality of moving rods (32), the plurality of moving rods (32) are respectively fixedly connected to a plurality of cleaning boxes (34), the plurality of moving rods (32) are respectively provided with a plurality of through grooves (33), the plurality of cleaning boxes (34) are respectively fixedly connected with a plurality of brushes (35), and the plurality of cleaning boxes (34) are respectively provided with a plurality of spray holes (36).

2. The photovoltaic energy storage integrated power supply storage box according to claim 1, characterized in that: Three installation frames (13) are slidably connected in the box body (1), a plurality of slide grooves (14) are respectively provided on the three installation frames (13), a plurality of connection columns (10) are respectively arranged in the plurality of slide grooves (14), three placement plates (15) are slidably connected to the three installation frames (13), and a plurality of limit bars (16) are respectively fixedly connected to the three placement plates (15).

3. The photovoltaic energy storage integrated power supply storage box according to claim 1, characterized in that: A motor (6) is fixedly connected to the box body (1), a bidirectional screw (7) is fixedly connected to the output shaft of the motor (6), both ends of the bidirectional screw (7) are respectively threadedly connected to two threaded plates (8), the tops of the two telescopic frames (9) are respectively rotatably connected to two sliding frames (12), the box body (1) is fixedly connected to two fixed frames (11), and the two sliding frames (12) are respectively slidably connected to the two fixed frames (11).

4. The photovoltaic energy storage integrated power supply storage box according to claim 1, characterized in that: A fan (17) is fixedly connected to the box body (1), and two ventilation pipes (18) are fixedly connected to the output end of the fan (17). The two ventilation pipes (18) are respectively provided with a plurality of through holes (19).

5. The photovoltaic energy storage integrated power supply storage box according to claim 4, characterized in that: A plurality of movable boxes (20) are slidably connected to the two ventilation pipes (18), a plurality of connecting pipes (21) are fixedly connected to the plurality of movable boxes (20), and the plurality of connecting pipes (21) are fixedly connected to a plurality of mounting frames (13).

6. The photovoltaic energy storage integrated power supply storage box according to claim 5, characterized in that: Three air inlet grooves (22) and three air inlet grooves (23) are respectively provided on the three placement plates (15). The three air inlet grooves (22) are respectively connected to three connecting pipes (21), and the three air inlet grooves (23) are respectively connected to the other three connecting pipes (21).

7. The photovoltaic energy storage integrated power supply storage box according to claim 6, characterized in that: The three placement plates (15) are respectively provided with a plurality of heat dissipation holes (24), and the plurality of heat dissipation holes (24) are respectively connected to the three air inlet grooves 1 (22) and the three air inlet grooves 2 (23). The three placement plates (15) are fixedly connected with a plurality of protrusions (25).

8. A photovoltaic energy storage integrated power supply storage box according to any one of claims 1 to 7, characterized in that: A plurality of limiting grooves (37) are provided on the three installation frames (13) and the three placement plates (15), and a sliding rod (38) is slidably connected in the box body (1).

9. The photovoltaic energy storage integrated power supply storage box according to claim 8, characterized in that: Two springs (39) are fixedly connected to the sliding rod (38), and the two springs (39) are fixedly connected to the box body (1). A plurality of limiting plates (40) are fixedly connected to the sliding rod (38), and the plurality of limiting plates (40) are respectively adapted to the plurality of limiting grooves (37).

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