Phosphine generator for grain deinsectization

Abstract

The invention solves the problem that phosphine gas is not uniformly distributed in a granary, and relates to the technical field of grain deinsectization, in particular to a phosphine generator for grain deinsectization, which comprises a granary and a phosphine generation mechanism, a gas distribution pipeline rotationally connected with the output end of the phosphine generation mechanism is arranged in the granary, and the phosphine generation mechanism is arranged in the granary. A plurality of gas guide assemblies are installed on the gas distribution pipeline, a driving structure in transmission connection with the gas distribution pipeline is arranged on one side of the phosphine generation mechanism, and the driving structure drives the gas distribution pipeline to rotate at a low speed to control the gas guide assemblies to dynamically cover the area in the granary; a steel mesh is arranged on the spray head branch pipe in a sleeving mode, a pushing structure is installed on the steel mesh, and when the gas distribution pipeline rotates at a low speed to feed hydrogen phosphide gas, part of grain in the granary naturally passes through the pushing structure from top to bottom so as to increase contact with the hydrogen phosphide gas. According to the invention, the permeation uniformity and efficiency of the hydrogen phosphide gas in the granary can be effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of grain pest control, in particular to a phosphine generator for grain pest control. Background Art

[0002] Grain deworming is an important part of grain storage and management. Pests not only consume, excrete or create tunnels in grain, causing physical damage and quality degradation of grain; their bodies also bring various microorganisms, such as bacteria, viruses and fungi, which may cause grain to mold, rot or produce harmful substances, thus affecting people's health. The eggs and adults of some other insects will continue to reproduce in the grain, causing their numbers to increase, further expanding the problem. Deworming can effectively control such dangers.

[0003] Among them, rice, soybeans, corn, etc. are rich in nutrients, so pests such as grain borer can easily reproduce in large numbers in these grains. In order to protect the stored grain in the granary, it is usually necessary to use chemical control agents and physical control measures on the granary. Among them, phosphine gas fumigation to control wheat pests is a common and effective method. It has strong insecticidal ability and has a good killing effect on a variety of stored grain pests.

[0004] However, under normal circumstances, when phosphine gas is released into a granary through a single fixed channel, the gas may be concentrated near the release point, while the concentration of phosphine gas in areas far from the release point is lower, resulting in uneven gas distribution and incomplete fumigation effect, thus affecting the overall fumigation effect. At the same time, a single fixed channel requires a long time for the phosphine gas to diffuse throughout the granary, and the diffusion speed is slow. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a phosphine generator for grain pest control, so as to solve the problem of uneven distribution of phosphine gas in a granary raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a phosphine generator for grain pest control, comprising a granary and a phosphine generating mechanism, wherein an air distribution pipeline rotatably connected to an output end of the phosphine generating mechanism is provided in the granary, and a plurality of air guide components are installed on the air distribution pipeline, and a driving structure drivingly connected to the air distribution pipeline is provided on one side of the phosphine generating mechanism, and the driving structure drives the air distribution pipeline to rotate at a low speed to control the plurality of air guide components to dynamically cover the area in the granary;

[0007] The gas guide component includes a nozzle branch pipe connected to the gas distribution pipeline, a steel mesh is sleeved on the nozzle branch pipe, and a pushing structure is installed on the steel mesh. When the gas distribution pipeline rotates at a low speed to release phosphine gas, part of the grain in the granary naturally passes from top to bottom along the pushing structure to increase contact with the phosphine gas.

[0008] Preferably, the pushing structure comprises an outer frame fixed to the middle of the top and bottom surfaces of the steel mesh, a material leakage groove and a through groove are respectively provided at the top and bottom of the outer frame, and an oblique plate is installed at the bottom of the outer frame.

[0009] Preferably, the cross-sectional shape of the outer frame is a triangle, and its height gradually decreases from the side in contact with the steel mesh to the other side, and the leakage trough is arranged in a multi-stage S shape.

[0010] Preferably, the nozzle branch pipe is inclined upward from one side connected to the gas distribution pipeline to the other side, and among two adjacent nozzle branch pipes arranged along the gas distribution pipeline path, the highest point of one nozzle branch pipe is at the same height as the lowest point of the other nozzle branch pipe.

[0011] Preferably, the gas distribution pipeline includes a lifting ring installed on the top wall of the granary and a layered pipe arranged in the granary, and the output end of the phosphine generating mechanism is equipped with an air supply branch pipe which is connected to the layered pipe at multiple points, and a steel bar with one end fixedly mounted on the surface of the air supply branch pipe is provided in the lifting ring.

[0012] Preferably, the layered pipe is arranged in a spiral shape, and a plurality of nozzle branches are evenly distributed on the layered pipe at the same intervals, and each turn of the spiral layered pipe forms a fixed connection point with the steel bar.

[0013] Preferably, the cross-sectional shape of the nozzle branch pipe is circular, the pores opened on the nozzle branch pipe are located on the upper side of the surface, the top surface of the steel mesh is inclined downward from the middle to both sides, and a solid sheet is embedded on the steel mesh.

[0014] Preferably, a hole plate is inserted on one side of the steel mesh, and a brush structure located inside the steel mesh is installed at the bottom of the hole plate. When the driving structure drives the air distribution pipeline to drive the nozzle branch pipe to rotate along one side of the hole plate, the brush structure brushes the pore area on the surface of the nozzle branch pipe.

[0015] Preferably, a telescopic spring is connected between the hole slot plate and the inner wall of the steel mesh, and the hole slot plate consists of a flat slot plate inserted on the steel mesh and a widening strip installed on one side of the flat slot plate.

[0016] By means of the above technical solution, the present invention provides a phosphine generator for grain pest control, which has at least the following beneficial effects:

[0017] 1. The present invention realizes the effect of releasing phosphine gas at multiple points in the granary through a plurality of gas guide components, and at the same time cooperates with driving the gas distribution pipeline to rotate to drive the movement trajectory of a plurality of gas guide components to form a dynamic coverage area, so that the phosphine gas can gradually penetrate into various areas of the grain pile with the movement of the gas guide components, significantly improving the distribution uniformity, penetration depth and fumigation efficiency of the phosphine gas in the granary, reducing the escape or residue of pests, and especially having a more significant killing effect on hidden pests.

[0018] 2. When the air guide assembly rotates following the air distribution pipeline, the present invention utilizes a pushing structure to allow the grain to form a dynamic flow trend between the air guide assembly and the steel mesh, thereby effectively increasing the contact effect between the grain and the phosphine gas.

[0019] 3. The present invention further improves the extensiveness of the diffusion of phosphine gas in the granary through the inclined arrangement of the nozzle branch pipe and its outer related auxiliary structure, while avoiding the blockage and accumulation of the same part of grain on the gas guide component.

[0020] 4. The present invention utilizes spiral layered pipes to ensure that the phosphine gas flows smoothly inside the spiral layered pipes, thereby ensuring that the phosphine reaches each nozzle branch pipe smoothly.

[0021] 5. The steel bars and the layered pipes of the present invention are fixed at multiple points, which can prevent the pipes from being deformed due to stress concentration in the layered pipes, and at the same time improve the transmission efficiency of the driving structure to the torque of the layered pipes.

[0022] 6. The present invention drives the gas distribution pipeline to rotate alternately clockwise and counterclockwise repeatedly through the driving structure, and feeds back the force of the grain pile to the wider side of the slot plate, which can control the slot plate to move back and forth relative to the steel mesh, thereby driving the strip brush structure to brush the pore area on the surface of the nozzle branch pipe back and forth inside the steel mesh. On the basis of using the solid sheet to block the vertical upward path of the pores opened on the nozzle branch pipe, the gaps in the pores on the surface of the nozzle branch pipe are further blocked to ensure the effect of its release of phosphine gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a structural schematic diagram of the gas distribution pipeline of the present invention;

[0026] Figure 3 It is a schematic diagram of the split structure of the gas guide component of the present invention;

[0027] Figure 4 It is a schematic diagram of the installation structure of the nozzle branch pipe and the steel mesh of the present invention;

[0028] Figure 5 It is a structural schematic diagram of the pushing structure of the present invention;

[0029] Figure 6 It is a schematic diagram of the installation structure of the hole groove plate and the strip brush structure of the present invention.

[0030] In the figure: 1. granary; 2. phosphine generating mechanism; 3. gas distribution pipeline; 301. lifting ring; 302. layered pipe; 303. air supply branch pipe; 304. steel bar; 4. air guide component; 401. nozzle branch pipe; 402. steel mesh; 403. pushing structure; 4031. outer frame; 4032. leakage trough; 4033. through groove; 4034. italic plate; 404. solid sheet; 405. hole groove plate; 4051. strip brush structure; 4052. telescopic spring; 5. driving structure. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0032] Embodiment 1

[0033] See also Figure 1-Figure 6This embodiment proposes a phosphine generator for grain pest control, which can effectively improve the penetration uniformity and efficiency of phosphine gas in the granary 1. The phosphine generator for grain pest control mainly uses the phosphine generating mechanism 2 to generate phosphine gas fumigation to remove the insects generated in the granary 1. The granary 1 is provided with an air distribution pipeline 3 that is rotatably connected to the output end of the phosphine generating mechanism 2, and a plurality of air guide components 4 are installed on the air distribution pipeline 3. A driving structure 5 that is transmission-connected to the air distribution pipeline 3 is provided on one side of the phosphine generating mechanism 2. The driving structure 5 drives the air distribution pipeline 3 to rotate at a low speed to control the plurality of air guide components 4 to dynamically cover the area in the wheat granary 1. The granary 1 is provided with a bottom plate, the upper layer of the bottom plate is a grain storage space, and the lower layer is a placement space reserved for the phosphine generating mechanism 2 and the driving structure 5. When it is necessary to fumigate and remove insects from the grain in the storage space of the granary 1, the phosphine generating mechanism 2 is activated to introduce phosphine gas into the air distribution pipeline 3, and the gas is dispersed to each gas guide component 4 along the path of the gas distribution pipeline 3, and finally discharged to each position in the granary 1, thereby improving the dispersion of the initial delivery of phosphine gas. In addition, the driving structure 5 composed of a motor, a spur gear sleeved on the output end of the motor and the outer side of the bottom end of the gas distribution pipeline 3 is operated in coordination to control the rotation of the gas distribution pipeline 3 relative to the output end of the phosphine generating mechanism 2, thereby driving a plurality of gas guide components 4 to follow the rotation movement in the grain storage space, and the movement trajectory forms a dynamic coverage area, so that the gas can be gradually penetrated into various areas of the grain pile with the movement of the gas guide component 4, thereby effectively avoiding the problem of excessive concentration of local phosphine gas or dead corners. At the same time, the centrifugal force generated by the rotation of the gas distribution pipeline 3 can push the phosphine gas outward, and combined with the multi-angle arrangement and injection of a plurality of gas guide components 4, a vortex or annular airflow will be formed, thereby more effectively improving the penetration uniformity of the phosphine gas in the grain pile.

[0034] The grain pest control structure and method are mainly used for grains such as rice, soybeans, and corn, which have relatively smooth surfaces, relatively large gaps between adjacent particles, and certain fluidity. The purpose is to ensure that the air distribution pipeline 3 and several air guide components 4 can rotate at a low speed in this type of grain when the driving structure 5 is operated, and under the slight disturbance caused by the low-speed rotation of the air distribution pipeline 3 and the air guide components 4, this type of grain can be redistributed relatively quickly, and will not form dense accumulation that hinders the rotation of the air distribution pipeline 3.

[0035] Embodiment 2

[0036] Following the above-mentioned embodiment 1, when the air guide component 4 follows the rotation of the air distribution pipeline 3 to dynamically spray the phosphine gas, the fluidity of the grain in the granary 1 only depends on the push of the air guide component 4 during movement, and the fluidity of the grain is insufficient, thereby affecting the contact effect between the phosphine gas and the grain. In order to effectively improve this problem, Figure 3-Figure 6As shown, the air guide component 4 includes a nozzle branch pipe 401 connected to the air distribution pipeline 3, and a steel mesh 402 is fixedly sleeved on the nozzle branch pipe 401, and the diameter of the hole groove on the steel mesh 402 is smaller than the particle size of the grain in the granary 1, in order to effectively intercept the grain and prevent it from contacting the air outlet area on the nozzle branch pipe 401, causing blockage of the air outlet area. A pushing structure 403 is welded on the steel mesh 402, and the pushing structure 403 includes an outer frame 4031 fixed to the middle of the top and bottom surfaces of the steel mesh 402. The cross-sectional shape of the outer frame 4031 is triangular, and its height gradually decreases from the side in contact with the steel mesh 402 to the other side. The triangular outer frame 4031 increases the structural strength of the air guide component 4 while reducing the resistance to its movement in the grain pile. The top and bottom of the outer frame 4031 are respectively provided with a leakage groove 4032 and a through groove 4033. The leakage groove 4032 is arranged in a multi-stage S shape to ensure that the grain entering the outer frame 4031 is sufficiently dispersed. When the plurality of gas guide components 4 rotate dynamically and the phosphine generating mechanism 2 is used to release the phosphine gas, the phosphine gas gradually disperses into the nozzle branch pipes 401 in the plurality of gas guide components 4 along the internal channel of the gas distribution pipeline 3, and then overflows along the gas outlet area in the nozzle branch pipe 401 and gradually passes through the steel mesh 402 and the outer frame 4031. In addition, when the gas guide component 4 moves in the grain pile, the grain above the outer frame 4031 will pass through the leakage groove 4032 and the through groove 4033 from top to bottom, forming a dynamic trend of flow inside the space of the outer frame 4031, thereby effectively increasing the contact effect with the phosphine gas.

[0037] In addition, by installing the bevel plate 4034 at the bottom of the outer frame 4031, when the air guide component 4 moves in the grain pile, the bevel plate 4034 can generate a certain driving force on the grain in the moving direction, thereby instantly forming a recessed area below the through groove 4033, so that the grain that enters the outer frame 4031 from the leakage groove 4032 can continue to move downward and pass through the through groove 4033 to be discharged into the recessed area, thereby avoiding the accumulation of grain in the outer frame 4031 and affecting the flow effect.

[0038] Embodiment 3

[0039] The nozzle branch pipe 401 is tilted upward from one side connected to the gas distribution pipeline 3 to the other side, and in the two adjacent nozzle branch pipes 401 arranged along the path of the gas distribution pipeline 3, the highest point of one nozzle branch pipe 401 is at the same height as the lowest point of the other nozzle branch pipe 401. The tilted nozzle branch pipe 401 helps the phosphine gas to be sprayed at a wider angle and direction, further improving the extensive diffusion of the phosphine gas in the granary 1, and then improving the insect removal effect. In conjunction with the dynamic rotation of the gas distribution pipeline 3, it helps the gas to pass through the entire space, effectively clean up the hidden area, and ensure that there are no dead corners. In addition, the nozzle branch pipe 401 is tilted, and accordingly, in order to ensure the uniformity of the structure, the steel mesh 402 and the pushing structure 403 on the outside are also tilted. Therefore, the grain on the upper side of the two can not only slide to the sides, but also slide to the lower place, which helps to avoid the same part of the grain from accumulating and clogging on the upper side of the two.

[0040] Embodiment 4

[0041] The gas distribution pipeline 3 includes a ring 301 installed on the top wall of the granary 1 and a layered pipe 302 arranged in the granary 1. The layered pipe 302 is arranged in a spiral shape. The output end of the phosphine generating mechanism 2 is installed with a gas supply branch pipe 303 connected to the layered pipe 302 at multiple points. A steel bar 304 is fixedly sleeved on the surface of the gas supply branch pipe 303 at one end in the ring 301. A plurality of nozzle branches 401 are evenly distributed on the layered pipe 302 with the same spacing. Each circle of the spiral layered pipe 302 has a fixed connection point with the steel bar 304. Figure 1 and Figure 2 As shown, by setting the hierarchical pipe 302 in a spiral shape, the phosphine gas can be made to rotate and flow in the pipeline, avoiding sudden changes of the phosphine gas in the hierarchical pipe 302 and stagnation of the air flow, thereby ensuring that the phosphine gas flows smoothly inside it and that the phosphine smoothly reaches each nozzle branch pipe 401. In addition, the diameter of the air inlet end of the air supply branch pipe 303 is consistent with the diameter of the pipeline at the output end of the phosphine generating mechanism 2, both of which are larger than the diameter of the hierarchical pipe 302, and the exhaust end of the air supply branch pipe 303 is divided into multiple ports, which are connected to different positions on the hierarchical pipe 302, thereby ensuring the transportation capacity of the phosphine gas and reducing the pressure loss of the phosphine gas in the hierarchical pipe 302.

[0042] Following the above-mentioned embodiment 1, when the driving structure 5 is used to control the low-speed rotation of the layered tube 302 in the gas distribution pipeline 3, the power output by the driving structure 5 may not be evenly transmitted to the entire layered tube 302, especially when the layered tube 302 is long, it is easy to cause power attenuation or unevenness. In order to effectively solve this problem, Figure 2As shown, the steel bar 304 is divided into a vertical part, a horizontal part and a plurality of connecting parts, and is fixedly connected to the layered pipe 302 at multiple points through the plurality of connecting parts, so that the force of the layered pipe 302 is dispersed to multiple supporting points, thereby preventing the pipe deformation caused by stress concentration. In addition, the multi-point fixed connection is conducive to enhancing the connection rigidity between the driving structure 5 and the layered pipe 302 and improving the torque transmission efficiency.

[0043] Embodiment 5

[0044] When the nozzle branch pipe 401 moves in the grain pile, the dust contained in the grain pile will fall straight down and gather on the pore surface of the nozzle branch pipe 401, which may easily cause the pores to be blocked, affecting the efficiency and effect of the extraction of phosphine gas. In order to effectively solve this problem, Figure 3 and Figure 6 As shown, the cross-sectional shape of the nozzle branch pipe 401 is circular, the apertures provided on the nozzle branch pipe 401 are located on the upper side of the surface, the top surface of the steel mesh 402 is inclined downward from the middle to both sides, and a solid sheet 404 is embedded on the steel mesh 402. By adding a solid sheet 404 directly above the apertures provided on the nozzle branch pipe 401, the vertical upward path of the apertures provided on the nozzle branch pipe 401 is blocked, so as to prevent the dust in the grain pile from passing through the steel mesh 402 directly downward and falling into the aperture area of ​​the nozzle branch pipe 401, so that the phosphine gas ejected outward from the apertures is emitted outward along the area on the steel mesh 402 except the solid sheet 404.

[0045] A hole slot plate 405 is inserted into one side of the steel mesh 402, and a brush structure 4051 located inside the steel mesh 402 is installed at the bottom of the hole slot plate 405. When the driving structure 5 drives the air distribution pipeline 3 to drive the nozzle branch pipe 401 to rotate along one side of the hole slot plate 405, the brush structure 4051 brushes the pore area on the surface of the nozzle branch pipe 401. A telescopic spring 4052 is connected between the hole slot plate 405 and the inner wall of the steel mesh 402. The hole slot plate 405 consists of a flat slot plate inserted into the steel mesh 402 and a widened strip installed on one side of the flat slot plate. Furthermore, the motor in the driving structure 5 is preferably a stepper motor. When the phosphine gas is put into the granary 1 in a covering manner, the driving structure 5 drives the gas distribution pipeline 3 to rotate in the set direction. When the pore area on the nozzle branch pipe 401 needs to be cleaned, the driving structure 5 is controlled to drive the gas distribution pipeline 3 to rotate alternately clockwise and counterclockwise. During this process, the grain pile feeds back the force on the wider side of the slot plate 405, which can control the slot plate 405 to move back and forth relative to the steel mesh 402, thereby driving the brush structure 4051 to brush the pore area on the surface of the nozzle branch pipe 401 back and forth inside the steel mesh 402, further reducing the risk of blockage. In addition, on this basis, a telescopic spring 4052 is added, and its elastic properties are used to give the slot plate 405 a force to move toward the outside of the steel mesh 402, thereby ensuring that the brush structure 4051 does not block the pores on the nozzle branch pipe 401 during the subsequent process of putting phosphine gas into the granary 1.

[0046] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A phosphine generator for grain pest control, comprising a granary (1) and a phosphine generating mechanism (2), characterized in that: The granary (1) is provided with an air distribution pipeline (3) rotatably connected to the output end of the phosphine generating mechanism (2), a plurality of air guide components (4) are installed on the air distribution pipeline (3), and a driving structure (5) drivingly connected to the air distribution pipeline (3) is provided on one side of the phosphine generating mechanism (2), and the driving structure (5) drives the air distribution pipeline (3) to rotate at a low speed to control the plurality of air guide components (4) to dynamically cover the area inside the granary (1); The gas guide assembly (4) comprises a nozzle branch pipe (401) connected to the gas distribution pipeline (3), a steel mesh (402) is sleeved on the nozzle branch pipe (401), and a pushing structure (403) is installed on the steel mesh (402). When the gas distribution pipeline (3) rotates at a low speed to release phosphine gas, part of the grain in the granary (1) naturally passes from top to bottom along the pushing structure (403) to increase contact with the phosphine gas.

2. The phosphine generator for grain deworming according to claim 1, characterized in that: The pushing structure (403) comprises an outer frame (4031) fixed to the middle of the top and bottom surfaces of the steel mesh (402), the top and bottom of the outer frame (4031) are respectively provided with a material leakage groove (4032) and a through groove (4033), and the bottom of the outer frame (4031) is installed with an inclined plate (4034).

3. The phosphine generator for grain deworming according to claim 2, characterized in that: The cross-sectional shape of the outer frame (4031) is triangular, and its height gradually decreases from the side in contact with the steel mesh (402) to the other side, and the leakage trough (4032) is arranged in a multi-stage S shape.

4. The phosphine generator for grain pest control according to claim 1, characterized in that: The nozzle branch pipe (401) is inclined upward from one side connected to the gas distribution pipeline (3) to the other side, and among two adjacent nozzle branch pipes (401) arranged along the path of the gas distribution pipeline (3), the highest point of one nozzle branch pipe (401) is at the same height as the lowest point of the other nozzle branch pipe (401).

5. The phosphine generator for grain pest control according to claim 1, characterized in that: The gas distribution pipeline (3) comprises a hanging ring (301) installed on the top wall of the granary (1) and a layered pipe (302) arranged in the granary (1); an air supply branch pipe (303) connected to the layered pipe (302) at multiple points is installed at the output end of the phosphine generating mechanism (2); a steel bar (304) is arranged in the hanging ring (301) and is fixedly sleeved on the surface of the air supply branch pipe (303) at one end.

6. The phosphine generator for grain pest control according to claim 5, characterized in that: The layered pipe (302) is arranged in a spiral shape, and a plurality of nozzle branches (401) are evenly distributed on the layered pipe (302) at the same interval, and each turn of the spiral layered pipe (302) generates a fixed connection point with the steel bar (304).

7. The phosphine generator for grain pest control according to claim 1, characterized in that: The cross-sectional shape of the nozzle branch pipe (401) is circular, the pores provided on the nozzle branch pipe (401) are located on the upper side of the surface, the top surface of the steel mesh (402) is inclined downward from the middle to both sides, and a solid sheet (404) is embedded on the steel mesh (402).

8. The phosphine generator for grain pest control according to claim 1, characterized in that: A perforated plate (405) is inserted into one side of the steel mesh (402), and a strip brush structure (4051) located inside the steel mesh (402) is installed at the bottom of the perforated plate (405). When the driving structure (5) drives the air distribution pipeline (3) to drive the nozzle branch pipe (401) to rotate along one side of the perforated plate (405), the strip brush structure (4051) brushes the pore area on the surface of the nozzle branch pipe (401).

9. The phosphine generator for grain pest control according to claim 8, characterized in that: A telescopic spring (4052) is connected between the hole slot plate (405) and the inner wall of the steel mesh (402), and the hole slot plate (405) is composed of a flat slot plate plugged into the steel mesh (402) and a widening strip installed on one side of the flat slot plate.

Images