Compound fertilizer production workshop fresh air system

Abstract

The application relates to the technical field of fresh air dust removal, in particular to a fresh air system for a compound fertilizer production workshop, which comprises a box body with an air inlet and an air outlet, a dust blocking cavity, a dust filtering cavity, a dust falling cavity and a dust falling cavity are sequentially arranged in the box body from bottom to top, the air inlet is communicated with the dust blocking cavity, and the air outlet is communicated with the dust falling cavity; the dust blocking cavity is communicated with the dust filtering cavity through a connecting pipe, a dust blocking plate is arranged in the dust blocking cavity between the air inlet and the connecting pipe, and the dust blocking plate is spaced apart from the bottom of the dust blocking cavity; a filter cloth is sealed at the junction of the dust filtering cavity and the dust falling cavity, a plurality of dust falling plates are arranged in the dust falling cavity, and the dust falling plates are spaced apart from the bottom of the dust falling cavity; the dust falling cavity is communicated with the dust falling cavity through a connecting channel, and a spraying unit is arranged at the upper portion of the dust falling cavity; the bottoms of the dust blocking cavity, the dust filtering cavity, the dust falling cavity and the dust falling cavity are all funnel-shaped and are all communicated with discharge hoppers, and an opening and closing unit is arranged in the discharge hopper. The application can reduce the floor area and improve the dust treatment efficiency.

Description

Technical Field

[0001] This application relates to the technical field of fresh air dust removal, and in particular to fresh air systems for compound fertilizer production workshops. Background Technology

[0002] Compound fertilizers are chemical fertilizers containing two or more of the following nutrients: nitrogen, phosphorus, and potassium. They have advantages such as high nutrient content, fewer by-products, and good physical properties. They play a very important role in balanced fertilization, improving fertilizer utilization, and promoting high and stable crop yields.

[0003] A search revealed Chinese Patent Publication No. CN218421824U, which discloses a dust removal and cooling device for bio-organic fertilizer production. The device comprises an inertial force dust removal component one, a bag filter component, a settling separation component, and an inertial force dust removal component two, connected sequentially in the order of inlet and outlet. The dust-laden airflow enters through the inlet of the inertial force dust removal component one, and after dust removal, cooling, and drying, exits through the outlet of the inertial force dust removal component two. This invention achieves multi-stage dust removal, high air quality after dust removal, easy cleaning, semi-automation, and ensures the dryness of the exhaust airflow while simultaneously removing dust and cooling, thus maintaining a dry workshop environment.

[0004] Regarding the aforementioned technologies, the inventors have discovered the following drawbacks: the four boxes are arranged in a horizontal sequence, and adjacent boxes are connected by pipes, resulting in a large footprint for the entire dust removal device, which imposes significant limitations on the size of the workshop space; in addition, dust can be discharged from the bottom of each of the four boxes, requiring the dust from each box to be collected separately, and the dust must be gathered in one place before centralized treatment, affecting the dust treatment efficiency. Therefore, improvements are needed. Summary of the Invention

[0005] In order to reduce the footprint and improve the efficiency of dust treatment, this application provides a fresh air system for compound fertilizer production workshops.

[0006] The fresh air system for the compound fertilizer production workshop provided in this application adopts the following technical solution: The fresh air system for the compound fertilizer production workshop includes a box with an air inlet and an air outlet. The box is provided with a dust-blocking chamber, a dust-filtering chamber, a dust-falling chamber and a dust-sinking chamber arranged sequentially from bottom to top. The air inlet is connected to the dust-blocking chamber and the air outlet is connected to the dust-sinking chamber.

[0007] The dust-blocking chamber is connected to the dust-filtering chamber via a connecting pipe. The dust-blocking chamber is equipped with a dust-blocking plate located between the air inlet and the connecting pipe, and the dust-blocking plate is spaced apart from the bottom of the dust-blocking chamber. The junction of the dust-filtering chamber and the dust-collecting chamber is sealed with filter cloth. The dust-collecting chamber is equipped with several dust-collecting plates, and the dust-collecting plates are spaced apart from the bottom of the dust-collecting chamber. The dust-falling chamber is connected to the dust-collecting chamber via a connecting channel, and a spray unit is provided at the top of the dust-falling chamber.

[0008] The bottoms of the dust-blocking chamber, dust-filtering chamber, dust-falling chamber, and dust-sinking chamber are all funnel-shaped and connected to discharge hoppers. In two adjacent discharge hoppers, the lower opening of the upper discharge hopper faces the upper opening of the lower discharge hopper. The discharge hopper is equipped with an opening and closing unit.

[0009] Optionally, the air inlet is located at the upper part of the dustproof chamber, and the area of ​​the upper part of the dustproof chamber that allows gas to flow gradually increases from top to bottom, with the dustproof plate located at the upper part of the dustproof chamber.

[0010] Optionally, the dust filter chamber is provided with a dust-blocking plate located between the connecting pipe and the filter cloth, and the height of the lower surface of the dust-blocking plate gradually decreases from the connecting pipe to the discharge hopper on the dust filter chamber.

[0011] Optionally, the connecting channel is located directly above one end of the dust collection chamber, and the connecting pipe is located directly below the other end of the dust collection chamber.

[0012] Optionally, a drying box is provided between the dust settling chamber and the dust collection chamber. The drying box is filled with absorbent material, and the air outlet is connected to the dust collection chamber through the drying box.

[0013] Optionally, there are two drying boxes that are interconnected. The opposite sides of the two drying boxes and the inner wall of the box together form a dust settling chamber. One drying box is connected to the dust settling chamber. The connection point between the drying box and the dust settling chamber and the connecting channel are located at both ends of the dust settling chamber. The other drying box is connected to the air outlet.

[0014] Optionally, the opening and closing unit includes a rotating plate that can be flipped in a vertical plane. The rotating plate is connected to the discharge hopper by a torsion spring, and one end of the rotating plate is rotatably connected to the discharge hopper. The discharge hopper is provided with a first magnet block and a second magnet block for adsorbing and fixing the other end of the rotating plate.

[0015] When the first magnet attracts and fixes the rotating plate, the rotating plate will be closed in the discharge hopper, and the torsion spring will be in its natural state; when the second magnet attracts and fixes the downward-flipping rotating plate, the rotating plate will no longer be closed in the lower opening of the discharge hopper, and the torsion spring will be in a deformed state.

[0016] Optionally, the height of the rotating plate gradually decreases from the end of the rotating plate that is hinged to the discharge hopper to the other end of the rotating plate.

[0017] In summary, this application includes the following beneficial technical effects:

[0018] 1. This application achieves four settling processes and one drying process for dust, thereby improving the dust treatment effect;

[0019] 2. This application integrates multiple dust handling devices into a single housing and arranges them sequentially in a vertical direction, thereby reducing the floor space required and minimizing restrictions on workshop space;

[0020] 3. In this application, the dust from the four sedimentation processes can be discharged uniformly through the discharge hopper at the bottom of the box, allowing workers to directly carry out centralized dust treatment, thereby improving the efficiency of dust treatment. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure in an embodiment of this application;

[0022] Figure 2 This is a schematic cross-sectional view of the overall structure in the embodiments of this application;

[0023] Figure 3 This is a schematic diagram of the internal structure of the box in an embodiment of this application;

[0024] Figure 4 This is a front view of the discharge hopper and opening / closing unit in an embodiment of this application;

[0025] Figure 5 This is a three-dimensional structural diagram of the discharge hopper and the opening and closing unit in the embodiments of this application.

[0026] Reference numerals: 1. Box body; 11. Support leg; 12. Air inlet; 13. Air outlet; 2. Dust-blocking chamber; 21. Partition; 22. Connecting pipe; 23. Dust-blocking plate; 3. Dust-filtering chamber; 31. Filter cloth; 32. Dust-blocking plate; 4. Dust-falling chamber; 41. Dust-falling plate; 42. Connecting channel; 5. Dust-sinking chamber; 6. Discharge hopper; 7. Drying box; 8. Spraying unit; 81. Water pipe; 82. Spray head; 9. Opening and closing unit; 91. Rotating plate; 92. Torsion spring; 93. Horizontal shaft; 94. First magnet block; 95. Second magnet block. Detailed Implementation

[0027] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0028] This application discloses a fresh air system for a compound fertilizer production workshop. For example... Figure 1 As shown, the fresh air system of the compound fertilizer production workshop includes a vertically arranged box 1. The bottom of the box 1 is equipped with four support legs 11. The bottom of the box 1 is provided with an air inlet 12, and the top of the box 1 is provided with an air outlet 13. The gas containing dust in the compound fertilizer production workshop will be drawn into the box 1 through the air inlet 12 and drawn out of the box 1 through the air outlet 13.

[0029] like Figure 2 and Figure 3As shown, the interior of the housing 1 is divided into a dust-blocking chamber 2, a dust-filtering chamber 3, a dust-falling chamber 4, and a dust-collecting chamber 5 arranged sequentially from bottom to top. The air inlet 12 is connected to the upper part of the dust-blocking chamber 2. During the dust cleaning process, the gas carrying dust will enter the upper part of the dust-blocking chamber 2 through the air inlet 12.

[0030] The area available for gas flow in the upper part of the dust-blocking chamber 2 gradually increases from top to bottom. Therefore, the gas will gradually slow down as it flows downward in the dust-blocking chamber 2, allowing the heavier dust particles in the gas to settle due to their own gravity, thus achieving one-time treatment of the dust.

[0031] A partition 21 is provided at the junction of the dust-blocking chamber 2 and the dust-filtering chamber 3. The partition 21 is installed on the inner side wall of the housing 1. The dust-blocking chamber 2 is connected to the dust-filtering chamber 3 through a connecting pipe 22. The connecting pipe 22 is fixedly installed through the partition 21, and the connecting pipe 22 and the air inlet 12 are respectively located at the left and right ends of the dust-blocking chamber 2, thereby extending the flow path of the gas in the dust-blocking chamber 2 to improve the settling effect of dust in the gas.

[0032] The dust-blocking chamber 2 is provided with a dust-blocking plate 23 located between the air inlet 12 and the connecting pipe 22. There are two dust-blocking plates 23, which are installed on the lower surface of the partition 21. The dust-blocking plates 23 are spaced apart from the bottom of the dust-blocking chamber 2. The dust-blocking plates 23 can not only block the gas in the dust-blocking chamber 2 from flowing in the upper part of the dust-blocking chamber 2, but also further extend the flow path of the gas in the dust-blocking chamber 2 so that the dust in the gas can settle. Then the gas will enter the dust filter chamber 3 through the connecting pipe 22.

[0033] The width of the bottom of the housing 1 gradually decreases from top to bottom, making the bottom of the dust-blocking chamber 2 funnel-shaped. The center of the bottom of the dust-blocking chamber 2 is connected to the discharge hopper 6. The dust falling to the bottom of the dust-blocking chamber 2 will gather towards the center of the dust-blocking chamber 2 and fall into the discharge hopper 6, thus realizing the collection of dust in the dust-blocking chamber 2.

[0034] The junction of the dust filtration chamber 3 and the dust collection chamber 4 is sealed with a filter cloth 31. As the gas enters the dust filtration chamber 3, it will be blocked by the filter cloth 31 during its movement towards the dust collection chamber 4. Large dust particles in the gas will be blocked by the filter cloth 31 and accumulate in the dust filtration chamber 3, while the gas will pass through the filter cloth 31 and enter the dust collection chamber 4, thus achieving secondary treatment of the dust.

[0035] The dust filter chamber 3 is equipped with a dust blocking plate 32 located between the connecting pipe 22 and the filter cloth 31. The dust blocking plate 32 is installed on the inner side wall of the housing 1. The dust blocking plate 32 prevents the gas discharged from the connecting pipe 22 from being directly sprayed onto the filter cloth 31, thus extending the movement path of the gas in the dust filter chamber 3, so that the dust in the gas can further settle in the dust filter chamber 3.

[0036] Two partitions 21 are provided and are respectively located on the inner walls of the left and right sides of the housing 1. The distance between the two partitions 21 gradually decreases from top to bottom, so that the bottom of the dust filter chamber 3 is funnel-shaped. The inner walls of the housing 1 on the opposite side of the two dust baffles 23 together form a discharge hopper 6 connected to the lowest point of the bottom of the dust filter chamber 3. Therefore, the dust falling to the bottom of the dust filter chamber 3 will gather towards the middle of the dust filter chamber 3 and fall into the discharge hopper 6, thus realizing the collection of dust in the dust filter chamber 3.

[0037] The height of the lower surface of the dust blocking plate 32 gradually decreases from the connecting pipe 22 to the discharge hopper 6 on the dust filter chamber 3, so that the gas in the dust filter chamber 3 can approach the upper opening of the discharge hopper 6 during the flow process, so that the dust in the gas can settle into the discharge hopper 6.

[0038] Two drying boxes 7 are provided at the junction of the dust settling chamber 4 and the dust collection chamber 5. The drying boxes 7 are installed on the inner wall of the chamber 1. The opposite side of the two drying boxes 7 together with the inner wall of the chamber 1 forms the dust collection chamber 5. Several dust settling plates 41 are installed at the bottom of the drying boxes 7. The dust settling plates 41 are spaced apart from the bottom of the dust collection chamber 4. The gas entering the dust collection chamber 4 will be blocked by the dust settling plates 41 during the movement, so that the dust in the gas can be further settled in the dust collection chamber 4, realizing the three-stage treatment of dust.

[0039] One of the drying boxes 7 and the inner wall of the box 1 together form a connecting channel 42. The dust settling chamber 4 is connected to the dust settling chamber 5 through the connecting channel 42. The gas that settles in the dust settling chamber 4 will enter the dust settling chamber 5 through the connecting channel 42.

[0040] The connecting channel 42 is located directly above one end of the dust settling chamber 4, and the connecting pipe 22 is located directly below the other end of the dust settling chamber 4, thereby extending the flow path of the gas in the dust settling chamber 4 and improving the settling effect of the dust in the dust settling chamber 4.

[0041] Two filter cloths 31 are provided and are respectively located on the left and right inner walls of the housing 1. The distance between the two filter cloths 31 gradually decreases from top to bottom, so that the bottom of the dust collection chamber 4 is funnel-shaped. The center of the bottom of the dust collection chamber 4 is connected to the discharge hopper 6. Therefore, the dust falling to the bottom of the dust collection chamber 4 will gather towards the center of the bottom of the dust collection chamber 4 and fall into the discharge hopper 6, thus realizing the collection of dust in the dust collection chamber 4.

[0042] The upper part of the dust settling chamber 5 is equipped with a spray unit 8. The spray unit 8 includes a water pipe 81 installed on the top of the housing 1. Several spray heads 82 extending into the dust settling chamber 5 are connected to the water pipe 81. External water can enter the spray head 82 through the water pipe 81. The spray head 82 can spray water mist into the dust settling chamber 5. The water mist comes into contact with the dust in the gas and settles, realizing four treatments of the dust.

[0043] The distance between the two drying boxes 7 gradually decreases from top to bottom, making the bottom of the dust settling chamber 5 funnel-shaped. The center of the bottom of the dust settling chamber 5 is connected to the discharge hopper 6. The dust falling to the bottom of the dust settling chamber 5 will gather towards the center of the bottom of the dust settling chamber 5 and fall into the discharge hopper 6, thus realizing the collection of dust in the dust settling chamber 5.

[0044] The drying box 7 is filled with absorbent material, which can be granules made of absorbent material. The two drying boxes 7 are interconnected. One drying box 7 is connected to the dust settling chamber 5. The connection point between the drying box 7 and the dust settling chamber 5 and the connecting channel 42 are respectively located at both ends of the dust settling chamber 5. The other drying box 7 is connected to the air outlet 13. Therefore, the gas that has passed through the dust settling chamber 5 will pass through the two drying boxes 7 in sequence and be discharged through the air outlet 13, thus achieving dehumidification of the gas.

[0045] like Figures 3 to 5 As shown, the discharge hopper 6 is provided with an opening and closing unit 9. The opening and closing unit 9 includes a rotating plate 91 that can be flipped on a vertical plane. The rotating plate 91 is connected to the discharge hopper 6 by a torsion spring 92, and one end of the rotating plate 91 is rotatably connected to the discharge hopper 6 by a horizontal shaft 93. A first magnet block 94 and a second magnet block 95 are respectively installed on the inner walls of both sides of the discharge hopper 6.

[0046] As dust begins to enter the discharge hopper 6, the lower surface of the first magnet 94 will attract and fix the upper surface of the rotating plate 91, and the torsion spring 92 will be in its natural state. The torsion spring 92 and the first magnet 94 will work together to keep the rotating plate 91 stable. At this time, the rotating plate 91 will be closed in the discharge hopper 6, so that the settled dust can be temporarily stored in the discharge hopper 6 and prevent the gas between adjacent cavities from flowing to each other through the discharge hopper 6, so as to ensure the settling effect of the dust in the gas.

[0047] As dust accumulates, the pressure on the rotating plate 91 will increase until it flips downward and detaches from the first magnet 94. Without the attraction of the first magnet 94, the rotating plate 91 will continue to flip downward under the pressure of the dust and be attracted and fixed by the second magnet 95. At this time, the torsion spring 92 will gradually deform, and the lower opening of the discharge hopper 6 will be fully opened. The dust in the discharge hopper 6 will be quickly discharged through the lower opening of the discharge hopper 6 to minimize the flow of gas between adjacent cavities through the discharge hopper 6.

[0048] After the dust in the discharge hopper 6 is discharged, the pressure on the rotating plate 91 will decrease. Since the restoring force of the torsion spring 92 is greater than the attraction force of the second magnet 95 on the rotating plate 91, the rotating plate 91 will flip upward and reset and be attracted again by the first magnet 94. At this time, the rotating plate 91 will continue to be sealed in the discharge hopper 6.

[0049] It is worth noting that in two adjacent discharge hoppers 6, the lower opening of the upper discharge hopper 6 is directly opposite the upper opening of the lower discharge hopper 6. Therefore, the dust in the upper discharge hopper 6 will fall into the lower discharge hopper 6, increasing the weight of the dust in the lower discharge hopper 6. Since the volume of the discharge hoppers 6 arranged from top to bottom gradually increases, the discharge hoppers 6 will be opened sequentially from top to bottom to ensure that the dust in the housing 1 can be discharged at once as much as possible, reducing the frequency of opening of the discharge hoppers 6 and minimizing the flow of gas between adjacent cavities through the discharge hoppers 6.

[0050] The height of the rotating plate 91 gradually decreases from the end of the rotating plate 91 that is hinged to the discharge hopper 6 to the other end of the rotating plate 91, so that the end of the rotating plate 91 that is close to the first magnet block 94 is subjected to greater pressure, so that the rotating plate 91 can flip down and open under the pressure of dust, which facilitates the discharge of dust in the discharge hopper 6.

[0051] The implementation principle of the fresh air system in the compound fertilizer production workshop of this application embodiment is as follows: During the dust treatment process, the gas carrying dust will enter the upper part of the dust baffle chamber 2 through the air inlet 12. The gas will gradually slow down as it flows downward in the dust baffle chamber 2. Under the obstruction of the dust baffle plate 23, the heavier dust in the gas will settle into the discharge hopper 6 at the bottom of the dust baffle chamber 2 due to its own gravity. After settling once, the gas will enter the dust filter chamber 3 through the connecting pipe 22.

[0052] As the gas in the dust filter chamber 3 moves toward the dust collection chamber 4, it will be blocked by the dust blocking plate 32 and the filter cloth 31 in sequence. Large dust particles in the gas will settle into the discharge hopper 6 at the bottom of the dust filter chamber 3. After secondary settling, the gas will pass through the filter cloth 31 and enter the dust collection chamber 4.

[0053] During the movement of the gas in the dust settling chamber 4, it will be blocked by the dust settling plate 41. Some of the dust in the gas will settle into the discharge hopper 6 at the bottom of the dust settling chamber 4. After three settlings, the gas will enter the dust settling chamber 5 through the connecting channel 42.

[0054] During the movement of the gas in the dust settling chamber 5, it will come into contact with the water mist sprayed from the spray head 82. Some of the dust in the gas will settle into the discharge hopper 6 at the bottom of the dust settling chamber 5. After four settling processes, the gas will pass through two drying boxes 7 in sequence and be discharged through the air outlet 13, thus achieving the drying and dehumidification of the gas.

[0055] As more and more dust accumulates in the discharge hopper 6, the pressure on the rotating plate 91 will increase until the rotating plate 91 flips downward and detaches from the first magnet block 94. After losing the attraction of the first magnet block 94, the rotating plate 91 will continue to flip downward under the pressure of the dust and be attracted and fixed by the second magnet block 95. At this time, the torsion spring 92 will gradually deform, and the lower opening of the discharge hopper 6 will be fully opened, and the dust in the discharge hopper 6 will be quickly discharged through the lower opening of the discharge hopper 6.

[0056] Dust in the upper discharge hopper 6 will fall into the lower discharge hopper 6, increasing the weight of the dust in the lower discharge hopper 6. The discharge hoppers 6 arranged from top to bottom will open sequentially from top to bottom to ensure that the dust in the box 1 can be discharged at once as much as possible.

[0057] After the dust in the discharge hopper 6 is discharged, the pressure on the rotating plate 91 will decrease. Since the restoring force of the torsion spring 92 is greater than the attraction force of the second magnet 95 on the rotating plate 91, the rotating plate 91 will flip upward and reset and be attracted again by the first magnet 94. At this time, the rotating plate 91 will continue to be sealed in the discharge hopper 6.

[0058] In summary, this application achieves four-stage settling and one-stage drying of dust, thereby improving the dust treatment effect. This application integrates multiple dust treatment devices into a single housing 1 and arranges them vertically, thereby reducing the floor space required and minimizing space constraints in the workshop. The dust from the four-stage settling process can be uniformly discharged through the discharge hopper 6 at the bottom of the housing 1, allowing workers to directly perform centralized dust treatment, thus improving the dust treatment efficiency.

[0059] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A fresh air system for a compound fertilizer production workshop, characterized in that: The box (1) includes an air inlet (12) and an air outlet (13). The box (1) is provided with a dust-blocking chamber (2), a dust-filtering chamber (3), a dust-falling chamber (4) and a dust-sinking chamber (5) arranged sequentially from bottom to top. The air inlet (12) is connected to the dust-blocking chamber (2) and the air outlet (13) is connected to the dust-sinking chamber (5). The dust-blocking chamber (2) is connected to the dust-filtering chamber (3) through the connecting pipe (22). The dust-blocking chamber (2) is provided with a dust-blocking plate (23) located between the air inlet (12) and the connecting pipe (22). The dust-blocking plate (23) is spaced apart from the bottom of the dust-blocking chamber (2). The junction of the dust-filtering chamber (3) and the dust-falling chamber (4) is sealed with a filter cloth (31). The dust-falling chamber (4) is provided with several dust-falling plates (41). The dust-falling plates (41) are spaced apart from the bottom of the dust-falling chamber (4). The dust-sinking chamber (5) is connected to the dust-falling chamber (4) through the connecting channel (42). The upper part of the dust-sinking chamber (5) is provided with a spray unit (8). The bottoms of the dust-blocking chamber (2), the dust-filtering chamber (3), the dust-falling chamber (4), and the dust-sinking chamber (5) are all funnel-shaped and connected to the discharge hopper (6). In two adjacent discharge hoppers (6), the lower opening of the upper discharge hopper (6) is directly opposite the upper opening of the lower discharge hopper (6). The discharge hopper (6) is equipped with an opening and closing unit (9). The connecting channel (42) is located directly above one end of the dust collection chamber (4), and the connecting pipe (22) is located directly below the other end of the dust collection chamber (4). A drying box (7) is provided between the dust settling chamber (4) and the dust collection chamber (5). The drying box (7) is filled with absorbent material. The air outlet (13) is connected to the dust collection chamber (5) through the drying box (7). Several dust settling plates (41) are installed at the bottom of the drying box (7). Two drying boxes (7) are provided and connected to each other. The opposite sides of the two drying boxes (7) together with the inner wall of the box body (1) form a dust settling chamber (5). One of the drying boxes (7) is connected to the dust settling chamber (5). The connection point between the drying box (7) and the dust settling chamber (5) and the connecting channel (42) are respectively located at both ends of the dust settling chamber (5). The other drying box (7) is connected to the air outlet (13). The distance between the two drying boxes (7) gradually decreases from top to bottom, so that the bottom of the dust settling chamber (5) is set in a funnel shape. The center of the bottom of the dust settling chamber (5) is connected to the discharge hopper (6). The dust falling to the bottom of the dust settling chamber (5) will gather towards the center of the bottom of the dust settling chamber (5) and fall into the discharge hopper (6), thus realizing the collection of dust in the dust settling chamber (5).

2. The fresh air system for compound fertilizer production workshop according to claim 1, characterized in that: The air inlet (12) is located at the upper part of the dustproof chamber (2). The area of ​​the upper part of the dustproof chamber (2) that allows gas to flow gradually increases from top to bottom. The dustproof plate (23) is located at the upper part of the dustproof chamber (2).

3. The fresh air system for compound fertilizer production workshop according to claim 1, characterized in that: The dust filter chamber (3) is provided with a dust-blocking plate (32) located between the connecting pipe (22) and the filter cloth (31). The height of the lower surface of the dust-blocking plate (32) gradually decreases from the connecting pipe (22) to the discharge hopper (6) on the dust filter chamber (3).

4. The fresh air system for compound fertilizer production workshop according to claim 1, characterized in that: The opening and closing unit (9) includes a rotating plate (91) that can be flipped in a vertical plane. The rotating plate (91) is connected to the discharge hopper (6) by a torsion spring (92), and one end of the rotating plate (91) is rotatably connected to the discharge hopper (6). The discharge hopper (6) is provided with a first magnet block (94) and a second magnet block (95) for adsorbing and fixing the other end of the rotating plate (91). When the first magnet (94) attracts and fixes the rotating plate (91), the rotating plate (91) will be closed in the discharge hopper (6), and the torsion spring (92) will be in a natural state; when the second magnet (95) attracts and fixes the downward flipping rotating plate (91), the rotating plate (91) will no longer be closed in the lower opening of the discharge hopper (6), and the torsion spring (92) will be in a deformed state.

5. The fresh air system for compound fertilizer production workshop according to claim 4, characterized in that: The height of the rotating plate (91) gradually decreases from the end of the rotating plate (91) that is hinged to the discharge hopper (6) to the other end of the rotating plate (91).

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