Safety protection device of chemical storage tank

Abstract

The utility model provides a safety protection device of a chemical storage tank, and belongs to the technical field of chemical equipment. Comprising a tank body; the pressure relief opening is formed in the tank body, and the pressure relief opening is used for pressure relief of the tank body; the rotating rod is connected into the pressure relief opening in a sliding manner; the rotating fan is located in the pressure relief opening, the rotating fan is stably installed on the rotating rod, and the rotating fan is used for driving the rotating rod to rotate; the filter screen is located below the rotating fan, and the filter screen is stably installed in the pressure relief opening. According to the pressure relief device disclosed by the utility model, the rotating rod, the rotating fan, the filter screen, the auxiliary block, the cleaning block and the sealing plate are matched, so that the purpose of automatically cleaning the pressure relief device under the action of pressure so as to prevent blockage is achieved; the purposes of relieving the contact pressure between the auxiliary block and the filter screen and ensuring smooth rotation are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical equipment, in particular to a safety protection device for a chemical storage tank. Background Art

[0002] In the chemical industry, chemical storage tanks are key storage equipment, responsible for the safe storage of various chemical materials. With the rapid development of the chemical industry, chemical materials are diverse and complex in nature. These materials often have dangerous properties such as corrosiveness, toxicity, flammability and explosiveness, and are indispensable in the petrochemical, pharmaceutical manufacturing, fine chemical and other industries. It is extremely important to ensure the safe and stable operation of chemical storage tanks. Once a safety accident such as leakage or explosion occurs, it will pose a huge threat to the production and operation of the enterprise, the surrounding environment, the safety of personnel and social stability.

[0003] However, in the prior art, although the pressure relief device of the chemical storage tank is generally arranged above the tank body, impurities may still come into contact with it and cause blockage. For example, during the extraction, transportation and storage of crude oil, impurities such as mud, sand and rust may be mixed in. These impurities may flow and be injected into the storage tank. Due to the effect of fluid dynamics, they may be entrained by the upward surging materials. When the materials fluctuate and splash, they may enter the vicinity of the inlet of the pressure relief device above the tank body. At the same time, if the temperature of crude oil changes during storage, some components may precipitate, thereby increasing the risk of clogging the pressure relief device. Another example is fuel oil, which may contain unrefined substances during refining and transportation. Removed mechanical impurities, colloids, asphaltene, etc.; during long-term storage, these substances are easy to precipitate, and during the flow and state change of the material, they may also be carried to the top of the tank and block the safety protection device; common acid and alkali solution materials may be mixed with insoluble substances or crystallize and precipitate due to temperature changes; slurry materials contain impurities such as uncrushed ore particles, which are easy to precipitate and block equipment; organic synthesis raw materials may carry catalyst residues, by-products and other impurities, which may also precipitate and affect the normal operation of safety protection devices; once the pressure relief device is blocked, the pressure in the tank cannot be relieved in time when it rises abnormally, which greatly increases the risk of explosion and brings serious safety hazards to chemical production. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a safety protection device for a chemical storage tank, so as to solve the technical problems that the existing pressure relief device of the chemical storage tank is easy to be blocked, and the auxiliary block may be in too tight contact with the filter screen due to excessive pressure, so that the rotating fan cannot drive the sealing plate to rotate.

[0005] Technical solution: To achieve the above purpose, the present invention is implemented through the following technical solutions: a safety protection device for a chemical storage tank, comprising: a tank body; a pressure relief port, which is arranged on the tank body, and the pressure relief port is used for the tank body to relieve pressure; a rotating rod, which is slidably connected to the pressure relief port; a rotating fan, which is in the pressure relief port, and the rotating fan is stably installed on the rotating rod, and the rotating fan is used to drive the rotating rod to rotate; a filter, which is located below the rotating fan, and the filter is stably installed in the pressure relief port, and the filter is used to filter impurities in the pressure relief gas; a sealing plate, which is located below the filter, and the sealing plate is stably connected to one end of the rotating rod, and the sealing plate is used to seal the pressure relief port; a plurality of auxiliary blocks are provided, and the plurality of auxiliary blocks are stably connected to the sealing plate The sealing plate faces one end of the filter screen, and a plurality of the auxiliary blocks are evenly distributed on the sealing plate; there are a plurality of cleaning blocks, and the cleaning blocks are stably connected to one end of the auxiliary blocks facing the filter screen, and the cleaning blocks are used to clean the filter screen, wherein the material of the filter screen should be corrosion-resistant, high-temperature resistant and have a certain strength, such as stainless steel or special alloy materials, to adapt to the complex chemical environment and possible temperature changes in the chemical storage tank; the structure of the filter screen can be designed as a multi-layer composite structure, and the filters at different levels have different pore sizes, so as to more effectively filter impurities of different sizes; when installing the filter screen, ensure that it is tightly and reliably connected to the pressure relief port to avoid loosening or displacement during the pressure relief process.

[0006] In a further embodiment, at least two support rods are provided, and the support rods are stably connected to the tank body, and the support rods are located on both sides of the pressure relief port; the electromagnetic suction block is slidably connected to the support rod, and the electromagnetic suction block is located directly above the pressure relief port, and the electromagnetic suction block is used to seal the pressure relief port, wherein the material of the support rod should have high strength and good corrosion resistance to ensure that it can withstand the weight of the electromagnetic suction block and the friction generated during movement during long-term use; the support rod can be made of alloy steel or special corrosion-resistant alloy material; the connection method between the support rod and the tank body should be firmly welded or bolted to ensure that it will not loosen or fall off during the pressure relief process; the electromagnetic suction block should be an electromagnet with strong suction force, It can also work stably under different temperature and humidity conditions. A sealing ring can be set at the contact position between the electromagnetic suction block and the pressure relief port to avoid gas leakage during sealing; the control system of the electromagnetic suction block should be able to accurately control the size of its suction force and the time of opening and closing to adapt to different pressure conditions; the installation position of the support rod should ensure that the electromagnetic suction block can fit tightly with the pressure relief port when sealing the pressure relief port, and there will be no jamming or deviation during the sliding process; the suction force of the electromagnetic suction block should be able to reliably seal the pressure relief port under normal working pressure, and at the same time be able to respond quickly and open the pressure relief port when the pressure exceeds the safety threshold; the control system of the electromagnetic suction block should be connected to the pressure monitoring system of the tank to achieve automatic control.

[0007] In a further embodiment, a spring is installed on the support rod, and the spring is located between the electromagnetic suction block and the stopper at the top of the support rod. The spring is used to provide a buffer for the electromagnetic suction block, wherein the spring should be made of a material with a high elastic coefficient and good corrosion resistance, such as a stainless steel spring or a special alloy spring; the installation position of the spring should ensure that a uniform buffering force can be provided when the electromagnetic suction block moves to avoid deflection or instability.

[0008] In a further embodiment, a connecting rod is located in the pressure relief port, and one end of the connecting rod is stably connected to the electromagnetic suction block, and the other end is rotationally connected to the rotating rod; the rotating block is stably connected to the rotating rod, and the rotating block is located in the connecting rod, and the rotating block is used to realize the rotational connection between the connecting rod and the rotating rod, wherein the connecting rod should be made of a material with high strength and good wear resistance, such as alloy steel or special wear-resistant alloy materials; the connection method between the two ends of the connecting rod and the electromagnetic suction block and the rotating rod should be firmly welded or bolted to ensure that there will be no loosening or falling off during operation; the rotating block should be made of a material with good rotation performance and wear resistance, such as bearing steel or special self-lubricating material; the connection between the rotating block and the rotating rod should be tight fit or welding to ensure that there will be no loosening or deviation during rotation.

[0009] In a further embodiment, an auxiliary frame is stably connected to the pressure relief port, and the auxiliary frame is located between the rotating fan and the filter screen. The auxiliary frame is used to prevent the rotating rod from shaking, wherein the auxiliary frame should be made of a material with high strength and good stability, such as alloy steel or special structural steel materials; the structure of the auxiliary frame should be designed as a sturdy frame structure that can effectively limit the shaking of the rotating rod; the connection between the auxiliary frame and the pressure relief port should be firmly welded or bolted to ensure that it will not loosen or fall off during operation.

[0010] In a further embodiment, a plurality of rollers are provided, and the plurality of rollers are rotatably installed in the auxiliary block respectively, and the rollers at least partially expose the side of the auxiliary block facing the filter, and are used to reduce the friction between the cleaning block and the filter, wherein the rollers should be made of materials with good wear resistance and self-lubrication, such as ceramic materials or special polymer materials; the rollers should be installed in a manner that ensures that they can rotate freely in the auxiliary block and will not loosen or fall off; the exposed height of the rollers should be reasonably adjusted according to the thickness of the cleaning block and the expected pressure changes to ensure that the friction can be effectively reduced under different conditions.

[0011] In a further embodiment, the groove is located between the filter screen and the sealing plate, and the height of the groove is greater than the total height of the sealing plate, the auxiliary block and the cleaning block. The groove is used to cause the pressure relief gas to enter between the sealing plate and the filter screen, wherein the shape of the groove can be designed to be circular, square or other suitable shapes, and the specific shape should be selected according to the structure of the pressure relief port and working requirements; the inner wall of the groove should be smooth and flat to reduce the flow resistance of the pressure relief gas; the depth and width of the groove should be reasonably designed according to the size of the sealing plate, the auxiliary block and the cleaning block to ensure that these components can move freely in the groove during operation without affecting the flow of the pressure relief gas.

[0012] In a further embodiment, the cleaning block is a flexible part, wherein the flexible material of the cleaning block can be selected from rubber, silicone or other materials with good elasticity and corrosion resistance; the shape of the cleaning block should be designed to match the surface of the filter to ensure that the filter can be effectively cleaned; the installation method of the cleaning block should ensure that it can be firmly connected to the auxiliary block and will not fall off or loosen during operation.

[0013] In a further embodiment, the vertical center line of the connecting rod, rotating rod and sealing plate coincides with the vertical center line of the pressure relief port, wherein during the manufacturing and installation process, high-precision processing technology and measuring tools should be used to ensure that the vertical center line of the connecting rod, rotating rod and sealing plate strictly coincides with the vertical center line of the pressure relief port.

[0014] In a further embodiment, the cleaning block and the roller do not interfere with each other. During design and installation, the position and size of the cleaning block and the roller should be reasonably arranged so that they can maintain a certain distance during operation to avoid collision or friction. At the same time, the movement trajectories of the cleaning block and the roller under different pressure conditions should also be considered to ensure that they do not interfere with each other.

[0015] Beneficial effects: 1. Through the cooperation of the rotating rod, rotating fan, filter screen, auxiliary block, cleaning block and sealing plate, the purpose of automatically cleaning the pressure relief device under pressure to prevent blockage is achieved; when the pressure in the tank is too high, the electromagnetic suction block moves upward, and drives the rotating rod and the sealing plate upward through the connecting rod; at this time, the cleaning block is close to the filter screen; then, as the gas in the tank is discharged, the gas drives the rotating fan to rotate, and then the rotating rod rotates, driving the cleaning block to rotate and clean the filter screen; at the same time, the sealing plate seals the end of the pressure relief port in the tank body under normal circumstances, ensuring the sealing of the tank body under normal circumstances and preventing impurities from entering the pressure relief channel; the effect of effectively preventing the pressure relief device from being blocked is achieved, ensuring that the pressure relief channel always remains unobstructed when pressure relief is required, thereby improving the safety of chemical storage tanks and avoiding dangerous situations caused by blockage of the pressure relief device.

[0016] 2. The purpose of alleviating the contact pressure between the auxiliary block and the filter and ensuring smooth rotation is achieved by coordinating the cleaning block made of flexible material with the roller shaft and spring and other structures; under the action of pressure, the electromagnetic suction block moves upward, and when the cleaning block approaches the filter, the flexible cleaning block can be deformed to reduce direct pressure; the roller shaft is higher than the auxiliary block, and after the cleaning block contacts the filter, the roller shaft contacts the filter, and the rotatable roller shaft bears part of the pressure and reduces friction; the spring provides a buffer for the electromagnetic suction block to avoid the violent movement of the electromagnetic suction block causing impact on the device; even under high pressure, the possibility of close contact between the auxiliary block and the filter can be reduced, ensuring that the rotating fan can smoothly drive the sealing plate to rotate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is a structural schematic diagram of the utility model.

[0019] Figure 2 for Figure 1 Schematic diagram of the main cross-section structure.

[0020] Figure 3 It is a structural schematic diagram of a rotating fan.

[0021] Figure 4 for Figure 2 Schematic diagram of the structure at A.

[0022] Figure 5 for Figure 2 Schematic diagram of the structure at B.

[0023] The reference numerals in the figure are: 1, tank body; 101, pressure relief port; 1011, groove; 102, support rod; 2, electromagnetic suction block; 3, spring; 4, connecting rod; 5, rotating rod; 501, rotating block; 6, rotating fan; 7, auxiliary frame; 8, filter screen; 9, sealing plate; 901, auxiliary block; 9011, cleaning block; 10, roller shaft. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the practical embodiment clearer, the technical solution in the practical embodiment is clearly and completely described. Obviously, the described embodiment is a part of the practical embodiment, not all of the embodiments. Based on the embodiments in this practical, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this practical.

[0025] The embodiment of the present application provides a safety protection device for a chemical storage tank, which solves the technical problems that the existing pressure relief device for chemical storage tanks is easy to be blocked, and the auxiliary block may be in too tight contact with the filter screen due to excessive pressure, so that the rotating fan cannot drive the sealing plate to rotate. In actual use, the pressure relief device for the chemical storage tank is not easy to be blocked, and the situation that the auxiliary block is in too tight contact with the filter screen due to excessive pressure, which prevents the rotating fan from driving the sealing plate to rotate, is avoided.

[0026] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0027] Reference Figure 1-5 A safety protection device for a chemical storage tank comprises: a tank body 1; a pressure relief port 101, which is arranged on the tank body 1, and the pressure relief port 101 is used for pressure relief of the tank body 1; a rotating rod 5, which is slidably connected to the pressure relief port 101; a rotating fan 6, which is in the pressure relief port 101, and the rotating fan 6 is stably installed on the rotating rod 5, and the rotating fan 6 is used to drive the rotating rod 5 to rotate; a filter screen 8, which is located below the rotating fan 6, and the filter screen 8 is stably installed in the pressure relief port 101, and the filter screen 8 is used to filter impurities in the pressure relief gas ; A sealing plate 9 is located below the filter screen 8, and the sealing plate 9 is stably connected to one end of the rotating rod 5, and the sealing plate 9 is used to seal the pressure relief port 101; there are multiple auxiliary blocks 901, and the multiple auxiliary blocks 901 are stably connected to one end of the sealing plate 9 facing the filter screen 8, and the multiple auxiliary blocks 901 are evenly distributed on the sealing plate 9; there are multiple cleaning blocks 9011, and the cleaning blocks 9011 are stably connected to one end of the auxiliary blocks 901 facing the filter screen 8, and the cleaning blocks 9011 are used to clean the filter screen 8.

[0028] Through the cooperation of the rotating rod 5, the rotating fan 6, the filter 8, the auxiliary block 901, the cleaning block 9011 and the sealing plate 9, the purpose of automatically cleaning the pressure relief device under pressure to prevent blockage is achieved, and the effect of effectively preventing the pressure relief device from being blocked is achieved.

[0029] At least two support rods 102 are provided, and the support rods 102 are stably connected to the tank body 1, and the support rods 102 are located on both sides of the pressure relief port 101; the electromagnetic suction block 2 is slidably connected to the support rod 102, and the electromagnetic suction block 2 is located directly above the pressure relief port 101, and the electromagnetic suction block 2 is used to seal the pressure relief port 101.

[0030] Through the cooperation of the support rod 102 and the electromagnetic suction block 2, the pressure relief port 101 is sealed to ensure the sealing performance of the tank body 1 under normal circumstances.

[0031] The spring 3 is installed on the support rod 102 , and the spring 3 is located between the electromagnetic suction block 2 and the stopper at the top of the support rod 102 . The spring 3 is used to provide a buffer for the electromagnetic suction block 2 .

[0032] Through the cooperation of the support rod 102, the electromagnetic suction block 2 and the spring 3, a buffering effect is provided for the electromagnetic suction block 2, thereby preventing the electromagnetic suction block 2 from violently moving when the pressure changes and causing an impact on the device.

[0033] The connecting rod 4 is located in the pressure relief port 101, and one end of the connecting rod 4 is stably connected to the electromagnetic suction block 2, and the other end is rotationally connected to the rotating rod 5; the rotating block 501 is stably connected to the rotating rod 5, and the rotating block 501 is located in the connecting rod 4, and the rotating block 501 is used to realize the rotational connection between the connecting rod 4 and the rotating rod 5.

[0034] Through the cooperation of the connecting rod 4 , the rotating rod 5 and the rotating block 501 , a rotational connection between the connecting rod 4 and the rotating rod 5 is achieved, ensuring that the movement of the electromagnetic suction block 2 will not excessively interfere with the rotation of the rotating rod 5 .

[0035] The auxiliary frame 7 is stably connected to the pressure relief port 101 , and the auxiliary frame 7 is located between the rotating fan 6 and the filter screen 8 . The auxiliary frame 7 is used to prevent the rotating rod 5 from shaking.

[0036] The cooperation between the auxiliary frame 7 and the rotating rod 5 can prevent the rotating rod 5 from shaking, thereby improving the stability of the device.

[0037] There are multiple rollers 10, and the multiple rollers 10 are rotatably installed in the auxiliary block 901 respectively. The rollers 10 are at least partially exposed from the side of the auxiliary block 901 facing the filter 8. The rollers 10 are used to reduce the friction between the cleaning block 9011 and the filter 8.

[0038] Through the cooperation between the auxiliary block 901 and the roller 10, the effect of reducing the friction between the cleaning block 9011 and the filter screen 8 is achieved, which helps the cleaning block 9011 to better clean the filter screen 8 and reduce the wear on the filter screen 8.

[0039] The groove 1011 is located between the filter screen 8 and the sealing plate 9 . The height of the groove 1011 is greater than the total height of the sealing plate 9 , the auxiliary block 901 and the cleaning block 9011 . The groove 1011 is used to force the depressurized gas to enter between the sealing plate 9 and the filter screen 8 .

[0040] Through the cooperation of the filter screen 8, the sealing plate 9 and the groove 1011, the effect of causing the pressure relief gas to enter between the sealing plate 9 and the filter screen 8 is achieved, ensuring the smooth progress of the pressure relief process.

[0041] The cleaning block 9011 is a flexible part.

[0042] The cleaning block 9011 is a flexible component, which cooperates with other components to achieve the effect of reducing the direct pressure on the filter screen 8 under pressure, thereby avoiding the obstruction of rotation due to too tight contact.

[0043] The vertical center line of the connecting rod 4 , the rotating rod 5 and the sealing plate 9 coincides with the vertical center line of the pressure relief port 101 .

[0044] By designing that the vertical center lines of the connecting rod 4, the rotating rod 5, the sealing plate 9 and the pressure relief port 101 coincide with each other, the stability and symmetry of the device during operation are achieved, and the stress and friction caused by eccentricity are reduced.

[0045] The cleaning block 9011 and the roller shaft 10 do not interfere with each other.

[0046] The design of the cleaning block 9011 and the roller 10 not interfering with each other ensures that the cleaning block 9011 and the roller 10 can play their respective roles during operation without affecting each other, thereby improving the reliability and maintainability of the device.

[0047] During use, in the chemical storage tank, under normal circumstances, the electromagnetic suction block 2 seals the pressure relief port 101, and the sealing plate 9 seals the end of the pressure relief port 101 in the tank body 1; when the pressure in the tank body 1 is too high, the electromagnetic suction block 2 releases the seal and moves upward, and drives the rotating rod 5 and the sealing plate 9 upward through the connecting rod 4, so that the cleaning block 9011 contacts the filter screen 8; as the gas in the tank is discharged, the gas drives the rotating fan 6 to rotate, and then the rotating rod 5 rotates, driving the cleaning block 9011 to rotate and clean filter screen 8; at the same time, the groove 1011 provides a movable space for the sealing plate 9, the auxiliary block 901 and the cleaning block 9011. When the bottom surface of the sealing plate 9 moves to the same height as the top of the groove 1011, the depressurized gas will pass through the groove 1011 over the sealing plate 9 and thus pass through the filter screen 8; the auxiliary frame 7 prevents the rotating rod 5 from shaking, and the roller 10 is used to contact the filter screen 8 when the pressure is too high and the cleaning block 9011 is compressed, thereby reducing the friction between the cleaning block 9011 and the filter screen 8.

[0048] The control device, pressure monitoring device, supporting device, feed port and discharge port and other devices required in the above-mentioned are all prior arts and are non-essential technical features in this application, so they are not described or drawn in the documents and drawings of this application; and the figures described in the drawings are example figures, and their purpose is only to more intuitively show the key structure and connection relationship of the safety protection device of a chemical storage tank of the utility model; in actual application, the appearance and size of the device can be adjusted and optimized according to specific needs.

[0049] To sum up, compared with the prior art, the present invention has the following beneficial effects: through the cooperation of the rotating rod, the rotating fan, the filter screen, the auxiliary block and the cleaning block, the pressure relief device can be automatically cleaned under pressure, effectively preventing blockage, ensuring that the pressure relief channel is always unobstructed, and improving the safety of the chemical storage tank; the cleaning block is made of flexible material, and cooperates with grooves, rollers, springs and other structures to alleviate the contact pressure between the auxiliary block and the filter screen. Even under high pressure, it can reduce the possibility of close contact between the auxiliary block and the filter screen, ensuring that the rotating fan can smoothly drive the sealing plate to rotate and maintain the normal operation of the device.

[0050] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the above preferred embodiments of the present invention, and those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0051] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A safety protection device for a chemical storage tank, characterized in that: include: Tank (1); A pressure relief port (101) is provided on the tank body (1), and the pressure relief port (101) is used to relieve pressure of the tank body (1); A rotating rod (5) slidably connected to the pressure relief port (101); A rotating fan (6) is located in the pressure relief port (101), the rotating fan (6) is stably mounted on the rotating rod (5), and the rotating fan (6) is used to drive the rotating rod (5) to rotate; A filter screen (8) is located below the rotating fan (6), the filter screen (8) is stably installed in the pressure relief port (101), and the filter screen (8) is used to filter impurities in the pressure relief gas; A sealing plate (9) is located below the filter screen (8), the sealing plate (9) is stably connected to one end of the rotating rod (5), and the sealing plate (9) is used to seal the pressure relief port (101); A plurality of auxiliary blocks (901) are provided, and the plurality of auxiliary blocks (901) are stably connected to one end of the sealing plate (9) facing the filter screen (8), and the plurality of auxiliary blocks (901) are evenly distributed on the sealing plate (9); A plurality of cleaning blocks (9011) are provided, and the cleaning blocks (9011) are stably connected to one end of the auxiliary block (901) facing the filter screen (8), and the cleaning blocks (9011) are used to clean the filter screen (8).

2. A safety protection device for a chemical storage tank according to claim 1, characterized in that: Also includes: At least two support rods (102) are provided, and the support rods (102) are stably connected to the tank body (1), and the support rods (102) are located on both sides of the pressure relief port (101); The electromagnetic suction block (2) is slidably connected to the support rod (102), and the electromagnetic suction block (2) is located directly above the pressure relief port (101). The electromagnetic suction block (2) is used to seal the pressure relief port (101).

3. A safety protection device for a chemical storage tank according to claim 2, characterized in that: Also includes: A spring (3) is mounted on the support rod (102), and the spring (3) is located between the electromagnetic suction block (2) and a stopper at the top of the support rod (102), and the spring (3) is used to provide a buffer for the electromagnetic suction block (2).

4. A safety protection device for a chemical storage tank according to claim 1, characterized in that: Also includes: A connecting rod (4) is located in the pressure relief port (101), and one end of the connecting rod (4) is stably connected to the electromagnetic suction block (2), and the other end is rotationally connected to the rotating rod (5); The rotating block (501) is stably connected to the rotating rod (5), and the rotating block (501) is located inside the connecting rod (4). The rotating block (501) is used to realize the rotating connection between the connecting rod (4) and the rotating rod (5).

5. A safety protection device for a chemical storage tank according to claim 1, characterized in that: Also includes: The auxiliary frame (7) is stably connected to the pressure relief port (101), and the auxiliary frame (7) is located between the rotating fan (6) and the filter screen (8). The auxiliary frame (7) is used to prevent the rotating rod (5) from shaking.

6. A safety protection device for a chemical storage tank according to claim 1, characterized in that: Also includes: A plurality of roller shafts (10) are provided, and the plurality of roller shafts (10) are rotatably mounted in the auxiliary block (901), respectively; the roller shafts (10) are at least partially exposed on a side of the auxiliary block (901) facing the filter screen (8); and the roller shafts (10) are used to reduce the friction between the cleaning block (9011) and the filter screen (8).

7. A safety protection device for a chemical storage tank according to claim 1, characterized in that: Also includes: The groove (1011) is located between the filter screen (8) and the sealing plate (9); the height of the groove (1011) is greater than the total height of the sealing plate (9), the auxiliary block (901) and the cleaning block (9011); the groove (1011) is used to facilitate the depressurized gas to enter between the sealing plate (9) and the filter screen (8).

8. The safety protection device for a chemical storage tank according to claim 1, characterized in that: The cleaning block (9011) is a flexible part.

9. A safety protection device for a chemical storage tank according to claim 4, characterized in that: The vertical center lines of the connecting rod (4), the rotating rod (5) and the sealing plate (9) coincide with the vertical center line of the pressure relief port (101).

10. A safety protection device for a chemical storage tank according to claim 6, characterized in that: The cleaning block (9011) and the roller shaft (10) do not interfere with each other.

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