Control cabinet for intelligent storehouse

By using a heat dissipation device with high thermal conductivity silicone and curved corrugated heat sinks, as well as a three-layer air intake filtration system in the intelligent warehouse control cabinet, the problems of poor heat dissipation and dust accumulation are solved, achieving efficient heat dissipation and dust prevention, ensuring stable equipment operation and extending service life.

CN224192308UActive Publication Date: 2026-05-01龙口港集团有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
龙口港集团有限公司
Filing Date
2025-05-24
Publication Date
2026-05-01

AI Technical Summary

Technical Problem

The existing intelligent warehouse control cabinet has an imperfect heat dissipation design, which leads to heat accumulation, degrades the performance of electronic components, and allows dust to easily enter, causing short circuit risks and affecting the stable operation of the equipment.

Method used

The heat dissipation device consists of high thermal conductivity silicone, a fan, and curved wave-shaped heat sinks, combined with an air intake filtration device consisting of three layers of filters (bottom air intake dustproof filter, intermediate filter, and fine filter) to ensure clean air intake and prevent dust accumulation.

Benefits of technology

It effectively improves heat dissipation efficiency, prevents dust accumulation, ensures stable equipment operation, reduces the risk of failure, extends equipment life, and reduces maintenance costs.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of storehouse control cabinet protection, and discloses an intelligent storehouse control cabinet which comprises a cabinet body, a dustproof cover, a protective door, a top air outlet dustproof net, a heat dissipation device composed of a fan, a heat dissipation piece and high heat conduction silica gel, and an air inlet filtering device composed of a bottom air inlet dustproof net, an intermediate filtering net and a fine filtering net. The top of the cabinet body is provided with a dustproof cover, the bottom of the dustproof cover is cooperatively connected with the top of the cabinet body through adaptive screws, the side wall of the cabinet body is provided with two protective doors which are distributed in an axial symmetry manner, the cabinet body is internally provided with a heat dissipation device, and the top of the heat dissipation device is provided with a top air-out dustproof net. According to the control cabinet for the intelligent storeroom, the internal structure is simple and reasonable, and efficient work of electronic devices in the control cabinet is effectively guaranteed through the matching effect of the heat dissipation device and the air inlet filtering device.
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Description

A control cabinet for intelligent warehouses Technical Field

[0001] This utility model relates to the field of warehouse control cabinet protection technology, specifically a smart warehouse control cabinet. Background Technology

[0002] In the current era of rapid development in the modern warehousing industry, smart warehouses are being widely used as key facilities to improve warehousing efficiency and management. By leveraging automated equipment, IoT technology, and big data analytics, smart warehouses achieve efficient storage, precise management, and rapid delivery of goods, significantly improving the overall efficiency of warehousing operations.

[0003] The control cabinets of smart warehouses typically house a large number of high-load electronic components that continuously generate high heat during prolonged operation. However, existing heat dissipation designs are often inadequate, with problems such as poor heat dissipation channels and insufficient cooling fan power being common. This causes heat to accumulate inside the cabinet, resulting in electronic components operating in a high-temperature environment for extended periods. The performance of these components deteriorates as the temperature rises, and when the temperature exceeds a certain threshold, it may even trigger malfunctions, causing data loss or equipment shutdown, severely impacting the normal operation of the warehouse. Simultaneously, the complex environment of warehouses, with its high dust levels, inevitably draws in a significant amount of dust during operation. This dust gradually accumulates on the surfaces of electronic components, circuit boards, and in the heat dissipation devices. Dust accumulation on the surfaces of electronic components hinders heat dissipation, further exacerbating the heat dissipation problem. Dust falling on circuit boards may pose a short-circuit risk, threatening equipment safety, while dust entering the heat dissipation devices reduces heat dissipation efficiency, creating a vicious cycle. Therefore, we propose a control cabinet for smart warehouses. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a smart warehouse control cabinet that solves the aforementioned problems.

[0006] (II) Technical Solution

[0007] To achieve the above-mentioned objectives, this utility model provides the following technical solution: a control cabinet for an intelligent warehouse, comprising a cabinet body, a dust cover, protective doors, and a top exhaust dustproof net. A heat dissipation device is composed of a fan, heat sink, and high thermal conductivity silicone, and an air intake filtration device is composed of a bottom air intake dustproof net, a medium-level filter, and a fine filter. The top of the cabinet body is provided with a dust cover, the bottom of which is connected to the top of the cabinet body via matching screws. Two symmetrically distributed protective doors are provided on the side walls of the cabinet body, rotating around two opposite sides of the cabinet body. A heat dissipation device is installed inside the cabinet body, with a top exhaust dustproof net on top, connected to the top of the cabinet body via matching screws. An air intake filtration device is provided at the bottom of the cabinet body.

[0008] Preferably, the top of the cabinet is provided with a fan compartment, which is connected to the interior of the cabinet. The four corners of the top of the fan compartment are connected to the top air outlet dustproof net by adapter screws. The top of the cabinet has four symmetrically distributed connection holes. The interior of the cabinet is provided with an electrical component mounting plate. The side of the electrical component mounting plate opposite to the protective door has a silicone groove. The side wall of the cabinet has a rectangular opening. Each of the four corners of the rectangular opening has a rotating block, which is connected to the protective door for rotation. The bottom of the cabinet is provided with a filter compartment, which is connected to the interior of the cabinet. The inner wall of the filter compartment has a first connection groove and a second connection groove.

[0009] Preferably, the heat dissipation device has a fan at the top, which is connected to the inside of the fan compartment. The bottom of the fan has a heat sink, which is connected to the side wall of the silicone groove by an adapter screw. The space between the silicone groove and the heat sink is filled with high thermal conductivity silicone.

[0010] Preferably, the heat sink has a set of equidistant heat sink fins on its sidewall, and the heat sink fins are curved and wavy. Each of the four corners of the heat sink has a connection hole three, which is connected to the four corners of the back of the electrical component mounting plate by means of an adapter screw.

[0011] Preferably, the air intake filter device consists of three parts: a bottom air intake dustproof net, an intermediate filter, and a fine filter. The bottom of the air intake filter device is a bottom air intake dustproof net, and the four corners of the bottom air intake dustproof net are connected to the bottom of the filter chamber by matching screws. An intermediate filter is provided on the top of the bottom air intake dustproof net, and the intermediate filter is correspondingly engaged with the inside of the first connecting groove. A fine filter is provided on the top of the intermediate filter, and the fine filter is correspondingly engaged with the inside of the second connecting groove.

[0012] Preferably, the dust cover has support columns at all four corners at the bottom, and a rectangular frame is welded to the bottom of the support columns. Two connecting holes are provided on the two opposite sides of the rectangular frame in an axially symmetrical manner. The connecting holes are connected to the connecting holes by means of matching screws.

[0013] (III) Beneficial Effects

[0014] Compared with the prior art, this utility model provides a control cabinet for intelligent warehouses, which has the following advantages:

[0015] 1. This intelligent warehouse control cabinet features efficient heat dissipation, ensuring stable equipment operation. It utilizes high thermal conductivity silicone to rapidly transfer heat from electrical components to heat sinks. Combined with fans and curved, wave-shaped heat sinks, heat dissipation efficiency is significantly improved. The fans accelerate airflow, and the heat sinks increase the heat dissipation area, quickly expelling heat from the cabinet. Compared to traditional control cabinets with insufficient heat dissipation, this effectively prevents electronic components from experiencing performance degradation or malfunction due to high temperatures, reducing the risk of data loss and equipment downtime. It ensures stable operation of various intelligent warehouse equipment, improving the continuity and reliability of warehousing operations.

[0016] 2. The intelligent warehouse control cabinet features multiple dustproof features, extending the equipment's lifespan. Its air intake filtration system includes a bottom dustproof mesh, a mid-level filter, and a fine filter, providing three layers of filtration for the air entering the cabinet. This effectively blocks dust, reducing its accumulation on electronic components, circuit boards, and heat dissipation devices. This lowers the risk of short circuits and heat dissipation obstruction caused by dust, preventing damage to the equipment and extending the lifespan of the internal electronic components and the overall equipment. It also reduces equipment maintenance and replacement costs, providing a strong guarantee for the long-term stable operation of the intelligent warehouse. Attached Figure Description

[0017] Figure 1 is a schematic diagram of the control cabinet for intelligent warehouse of this utility model;

[0018] Figure 2 is a cross-sectional schematic diagram of the control cabinet for intelligent warehouse of this utility model;

[0019] Figure 3 is a cross-sectional view of the cabinet body of this utility model;

[0020] Figure 4 is a schematic diagram of the dust cover of this utility model;

[0021] Figure 5 is a schematic diagram of the heat sink of this utility model.

[0022] In the diagram: 1. Cabinet; 2. Dust cover; 3. Protective door; 4. Top exhaust dust filter; 5. Fan; 6. Heat sink; 7. Bottom intake dust filter; 8. Intermediate filter; 9. Fine filter; 10. High thermal conductivity silicone; 11. Electrical component mounting plate; 12. Silicone groove; 13. Fan compartment; 14. Connection hole one; 15. Filter compartment; 16. Connection slot one; 17. Connection slot two; 18. Rotating block; 19. Support column; 20. Connection hole two; 21. Heat sink; 22. Connection hole three. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please refer to Figures 1-5. A control cabinet for an intelligent warehouse includes a cabinet body 1, a dust cover 2, a protective door 3, and a top exhaust dustproof net 4. A heat dissipation device is composed of a fan 5, a heat sink 6, and high thermal conductivity silicone 10. An air intake filtration device is composed of a bottom air intake dustproof net 7, a medium-level filter 8, and a fine filter 9. The top of the cabinet body 1 is provided with a dust cover 2, and the bottom of the dust cover 2 is connected to the top of the cabinet body 1 by an adapter screw. The side wall of the cabinet body 1 is provided with two symmetrically distributed protective doors 3, which are connected to each other around two opposite sides of the cabinet body 1. A heat dissipation device is provided inside the cabinet body 1. The top of the heat dissipation device is provided with a top exhaust dustproof net 4, and the top exhaust dustproof net 4 is connected to the top of the cabinet body 1 by an adapter screw. An air intake filtration device is provided at the bottom of the cabinet body 1.

[0025] Furthermore, a fan compartment 13 is provided at the top of the cabinet 1, which is connected to the interior of the cabinet 1. The four corners of the top of the fan compartment 13 are connected to the top exhaust dustproof mesh 4 by adapter screws. Four symmetrically distributed connection holes 14 are provided at the top of the cabinet 1. An electrical component mounting plate 11 is provided inside the cabinet 1. A silicone groove 12 is provided on the side of the electrical component mounting plate 11 away from the protective door 3. A rectangular opening is provided on the side wall of the cabinet 1, and a rotating block 18 is provided at each of the four corners of the rectangular opening. The rotating block 18 is connected to the protective door 3 for rotational engagement. Next, a filter chamber 15 is provided at the bottom of the cabinet 1, and the filter chamber 15 is connected to the inside of the cabinet 1. The inner wall of the filter chamber 15 is provided with a first connecting groove 16 and a second connecting groove 17. The filter chamber 15 can effectively fix the air intake filter device, ensure the normal and efficient operation of the air intake filter device, prevent dust from entering the inside of the cabinet 1, and reduce the working efficiency of the intelligent warehouse control cabinet due to dust. The fan chamber 13 facilitates the acceleration of the internal air circulation rate, so that the heat inside the intelligent warehouse control cabinet can be quickly discharged, effectively reducing the internal temperature.

[0026] Furthermore, a fan 5 is provided on the top of the heat dissipation device, and the fan 5 is connected to the inside of the fan compartment 13. A heat sink 6 is provided at the bottom of the fan 5, and the heat sink 6 is connected to the side wall of the silicone groove 12 by an adapter screw. The space between the silicone groove 12 and the heat sink 6 is filled with high thermal conductivity silicone 10. The high thermal conductivity silicone 10 can efficiently conduct the heat from the back of the electrical component mounting plate 11 to the heat sink 6. Together with the fan 5, the heat is quickly discharged to the outside of the cabinet, ensuring the internal temperature of the cabinet is stable and ensuring the efficient operation of the internal electrical components.

[0027] Furthermore, the heat sink 6 has a set of heat sink fins 21 that are evenly distributed on its side wall, and the heat sink fins 21 are curved and wavy. The heat sink 6 has connection holes 22 at each of its four corners. The connection holes 22 are connected to the four corners of the back of the electrical component mounting plate 11 by means of adapter screws. The curved and wavy heat sink fins 21 increase the contact area with the air and, together with the fan 5, effectively increase the airflow rate, thus greatly improving the heat dissipation quality.

[0028] Furthermore, the air intake filter consists of three parts: a bottom air intake dustproof net 7, a medium-level filter 8, and a fine filter 9. The bottom of the air intake filter is the bottom air intake dustproof net 7, which is connected to the bottom of the filter chamber 15 at its four corners via matching screws. The top of the bottom air intake dustproof net 7 is equipped with a medium-level filter 8, which is engaged with the inside of the connecting groove 16. The top of the medium-level filter 8 is equipped with a fine filter 9, which is engaged with the inside of the connecting groove 2 17. This three-layer filtration effectively ensures the dust filtration effect and prevents dust accumulation inside.

[0029] Furthermore, the dust cover 2 has support columns 19 at the four corners of its bottom, and a rectangular frame is welded to the bottom of the support column 19. Two connecting holes 20 are symmetrically distributed on the two opposite sides of the rectangular frame. The connecting holes 20 are connected to the connecting holes 14 by matching screws. The unique structure of the dust cover 2 effectively ensures that there is no dust accumulation on the top, improving the overall structural rationality and practicality.

[0030] Structural Description:

[0031] Cabinet 1: Cabinet 1 is the main structure of the control cabinet for intelligent warehouses. The top is equipped with a dust cover 2, a fan compartment 13, etc., and the side wall is equipped with a protective door 3. The interior houses components such as electrical component mounting plates 11, providing installation space and protection for the whole.

[0032] Dust cover 2: Dust cover 2 is located on the top of cabinet 1. The support columns 19 at the four corners of the bottom are fixed to the top connection hole 14 of cabinet 1 through connection hole 20, which effectively prevents dust accumulation on the top and enhances the rationality of the structure.

[0033] Protective door 3: There are two protective doors 3, which are symmetrically distributed on the side wall of cabinet 1. They are rotatably connected to the side of cabinet 1 by rotating block 18, which makes it convenient for staff to open the cabinet to operate and maintain the devices inside.

[0034] Top exhaust dustproof net 4: The top exhaust dustproof net 4 is installed on the top of the cabinet 1 and is connected to the four corners of the top of the fan compartment 13 with matching screws. It can exhaust the hot air inside the cabinet and prevent external dust from entering from the top.

[0035] Fan 5: Fan 5 is installed inside the fan compartment 13, and its bottom is connected to the heat sink 6. When working, it accelerates the airflow and works with the heat sink 6 to quickly dissipate the heat inside the cabinet, ensuring a stable internal temperature.

[0036] Heat sink 6: Heat sink 6 is located at the bottom of fan 5. It is fixed to the back of electrical component mounting plate 11 through connection holes 22 at the four corners. The heat sink 21 on the side wall can increase the heat dissipation area and improve the heat dissipation effect.

[0037] Bottom air intake dustproof net 7: The bottom air intake dustproof net 7 is located in the bottom filter chamber 15 of the cabinet 1. It is connected to the bottom of the filter chamber 15 with matching screws at the four corners, which initially filters the air entering the cabinet and blocks large dust particles.

[0038] Intermediate filter 8: The intermediate filter 8 is placed on top of the bottom air inlet dustproof net 7 and is engaged with the connecting groove 16 on the inner wall of the filter chamber 15 to further filter dust in the air and improve the filtration effect.

[0039] Fine filter 9: Fine filter 9 is installed on top of intermediate filter 8 and is snapped into the inside of connecting groove 17. It can filter fine dust and effectively prevent dust from accumulating on electronic components inside the cabinet.

[0040] High thermal conductivity silicone 10: High thermal conductivity silicone 10 is filled between silicone groove 12 and heat sink 6, which can efficiently conduct heat from the back of the electrical component mounting plate 11 to heat sink 6, thus assisting in heat dissipation.

[0041] Electrical component mounting plate 11: The electrical component mounting plate 11 is located inside the cabinet 1 and is used to install various electronic components. The silicone groove 12 on its back cooperates with the heat sink 6 to ensure heat dissipation of the electrical components.

[0042] Silicone groove 12: Silicone groove 12 is opened on the side of the electrical component mounting plate 11 away from the protective door 3, and is used to fill high thermal conductivity silicone 10 to achieve efficient heat transfer and ensure normal operation of electrical components.

[0043] Fan compartment 13: The fan compartment 13 is located at the top of the cabinet 1 and is connected to the inside of the cabinet 1. It provides installation space for the fan 5 and helps to accelerate the air circulation inside the cabinet and dissipate heat.

[0044] Connection hole 14: There are four connection holes 14, which are symmetrically distributed on the top of the cabinet 1. They are used to cooperate with connection holes 20 of the bottom support column 19 of the dust cover 2 to achieve a stable installation of the dust cover 2.

[0045] Filter compartment 15: Filter compartment 15 is located at the bottom of cabinet 1 and is connected to the inside of cabinet 1. The connecting groove 16 and connecting groove 17 on the inner wall are used to fix the air intake filter device to prevent dust from entering the cabinet.

[0046] Connecting slot 16: Connecting slot 16 is located on the inner wall of filter chamber 15 and engages with intermediate filter screen 8 to position and fix intermediate filter screen 8, ensuring the air intake filtration effect.

[0047] Connecting slot 2 17: Connecting slot 2 17 is located on the inner wall of filter chamber 15 and is engaged with fine filter screen 9 to secure fine filter screen 9, ensuring its effective filtration of fine dust and improving dustproof performance.

[0048] Rotating block 18: Rotating block 18 is located at the four corners of the rectangular opening on the side wall of cabinet 1, and is rotatably connected to the protective door 3, so that the protective door 3 can be opened and closed flexibly, which is convenient for operation and maintenance;

[0049] Support column 19: The support column 19 is located at the four bottom corners of the dust cover 2. A rectangular frame is welded to the bottom and connected to the top of the cabinet 1 through the second connection hole 20. It supports the dust cover 2 and prevents dust from accumulating on the top.

[0050] Connection hole 20: Connection hole 20 is located on the bottom rectangular frame of the support column 19 and is connected to connection hole 14 on the top of the cabinet 1 with an adapter screw to achieve a stable assembly of the dust cover 2 and the cabinet 1.

[0051] Heat sink 21: The heat sink 21 is curved and wavy, and is evenly distributed on the side wall of the heat sink 6 to increase the contact area with air. Together with the fan 5, it increases the airflow speed and enhances the heat dissipation quality.

[0052] Connection hole 3 22: Connection hole 3 22 is located at the four corners of the heat sink 6. It is connected to the four corners of the back of the electrical component mounting plate 11 by the adapter screws to ensure that the heat sink 6 is installed firmly and to ensure the heat dissipation effect.

[0053] Working Principle: The intelligent warehouse control cabinet is installed correctly according to the diagram. During operation, outside air first enters the filter chamber 15 through the bottom air inlet dust filter 7. The bottom air inlet dust filter 7 initially filters out larger dust particles. Subsequently, the air passes through the intermediate filter 8 and the fine filter 9. The intermediate filter 8 further intercepts medium-sized dust particles, while the fine filter 9 filters out fine dust. The clean air, after three layers of filtration, enters the cabinet 1. Inside the cabinet, the electronic components mounted on the electrical component mounting plate 11 continuously generate heat. The high thermal conductivity silicone 10, filled between the silicone groove 12 and the heat sink 6, quickly conducts the heat from the back of the electrical component mounting plate 11 to the heat sink 6. The curved, wavy heat sink 21 on the side wall of the heat sink 6 increases the contact area with the air. When the fan 5 located in the fan compartment 13 starts, it accelerates the airflow. Under the action of the fan 5, the air quickly passes over the heat sink 21, carrying away the heat. The hot air rises and is discharged from the cabinet through the top exhaust dust screen 4. The protective door 3 is rotatably connected to the cabinet 1 through the rotating block 18, which makes it convenient for staff to open the protective door to maintain the internal components. The dust cover 2 is fixed with the connecting hole 20 on the bottom rectangular frame of the support column 19 and the connecting hole 14 on the top of the cabinet with matching screws, which effectively prevents dust accumulation on the top. The filter compartment 15 is securely installed with the air intake filter through the connecting groove 16 and the connecting groove 27. The fan compartment 13 provides installation space for the fan 5 and accelerates the airflow. All components work together to ensure that the internal temperature of the control cabinet is suitable and the dust content is low, ensuring the stable operation of electronic components.

[0054] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A control cabinet for an intelligent warehouse, comprising a cabinet body (1), a dust cover (2), a protective door (3), and a top exhaust dustproof net (4), a heat dissipation device consisting of a fan (5), a heat sink (6), and high thermal conductivity silicone (10), and an air intake filtration device consisting of a bottom air intake dustproof net (7), a medium-level filter (8), and a fine filter (9), characterized in that: The cabinet (1) is provided with a dust cover (2) on the top. The bottom of the dust cover (2) is connected to the top of the cabinet (1) by an adapter screw. The side wall of the cabinet (1) is provided with two protective doors (3) that are symmetrically distributed on the axis. The two protective doors (3) are connected to each other by rotating around the two opposite sides of the cabinet (1). The cabinet (1) is provided with a heat dissipation device. The top of the heat dissipation device is provided with a top air outlet dustproof net (4). The top air outlet dustproof net (4) is connected to the top of the cabinet (1) by an adapter screw. The bottom of the cabinet (1) is provided with an air intake filter device.

2. The intelligent warehouse control cabinet according to claim 1, characterized in that: The top of the cabinet (1) is provided with a fan compartment (13), which is connected to the inside of the cabinet (1). The top four corners of the fan compartment (13) are connected to the top air outlet dustproof net (4) by matching screws. The top of the cabinet (1) is provided with four symmetrically distributed connection holes (14). The inside of the cabinet (1) is provided with an electrical component mounting plate (11). The side of the electrical component mounting plate (11) away from the protective door (3) is provided with a silicone groove (12). The side wall of the cabinet (1) is provided with a rectangular opening. The four corners of the rectangular opening are provided with rotating blocks (18). The rotating blocks (18) are connected to the protective door (3) in a rotating fit. The bottom of the cabinet (1) is provided with a filter compartment (15), which is connected to the inside of the cabinet (1). The inner wall of the filter compartment (15) is provided with a connection groove (16) and a connection groove (17).

3. The intelligent warehouse control cabinet according to claim 1, characterized in that: The heat dissipation device is provided with a fan (5) at the top, and the fan (5) is connected to the inside of the fan compartment (13). The bottom of the fan (5) is provided with a heat sink (6), and the heat sink (6) is connected to the side wall of the silicone groove (12) by an adapter screw. The space between the silicone groove (12) and the heat sink (6) is filled with high thermal conductivity silicone (10).

4. The intelligent control cabinet for a vault of claim 3, wherein: The heat sink (6) has a set of heat sinks (21) that are evenly distributed on the side wall, and the heat sinks (21) are curved and wavy. The heat sink (6) has three connection holes (22) at each of its four corners. The three connection holes (22) are connected to the four corners of the back of the electrical component mounting plate (11) by means of adapter screws.

5. A control cabinet for an intelligent warehouse according to claim 1, characterized in that: The air intake filter consists of three parts: a bottom air intake dustproof net (7), an intermediate filter (8), and a fine filter (9). The bottom of the air intake filter is the bottom air intake dustproof net (7), and the four corners of the bottom air intake dustproof net (7) are connected to the bottom of the filter chamber (15) by matching screws. The top of the bottom air intake dustproof net (7) is provided with an intermediate filter (8), which is engaged with the inside of the first connecting groove (16). The top of the intermediate filter (8) is provided with a fine filter (9), which is engaged with the inside of the second connecting groove (17).

6. The intelligent control cabinet for a vault of claim 1, wherein: The dust cover (2) has support columns (19) at the four corners of its bottom, and a rectangular frame is welded to the bottom of the support column (19). Two connecting holes (20) are provided on the two opposite sides of the rectangular frame in an axially symmetrical manner. The connecting holes (20) are connected to the connecting hole (14) by means of an adapter screw.