Granary circulation fumigation device and use method

Abstract

The invention relates to the technical field of granary insect pest prevention, in particular to a granary circulation fumigation device which comprises a granary, the granary comprises a base, the base is placed on the ground, a side wall is fixedly connected to the base, a top cover is fixedly connected to the side wall, and four spray head mechanisms are evenly and fixedly connected to the top cover. The spray head mechanism comprises a mounting barrel, the mounting barrel is fixedly connected to the top cover, a driving assembly and a spray head assembly are arranged on the mounting barrel, two symmetrical pressurizing assemblies are arranged on the spray head assembly, and the pressurizing assemblies are connected with the driving assembly through connecting rods. According to the device, through the arrangement of the spray head mechanism, the poison gas input into the granary is subjected to secondary pressurization by taking the flow of the poison gas in the pipeline as a power source, so that the flow speed of the poison gas is increased, the poison gas can be diffused in the granary more quickly, and the fumigation efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of granary pest prevention, and in particular to a granary circulating fumigation device and a use method thereof. Background Art

[0002] Circulation fumigation is a necessary facility for pest control currently used in grain depots. It uses a generator outside the warehouse to add medicine, and uses the circulation system inside the warehouse to disperse the drug gas in the grain warehouse, thereby achieving the purpose of killing insects. It can make the poison gas diffuse quickly and evenly in the grain pile, reduce the labor intensity of adding medicine, reduce the time of contact with poison gas, and achieve good pest control effects.

[0003] At present, the application of circulating fumigation technology in newly built tall bungalows has also been widely recognized. However, the current circulating fumigation technology still has the following technical problems: during use, the pressure in the pipeline for transporting poisonous gas is relatively low, which makes the flow rate of poisonous gas entering the granary low and unable to diffuse quickly, thus reducing the efficiency of fumigation. Summary of the invention

[0004] The purpose of the present invention is to provide a granary circulating fumigation device and a method of use to solve the problems raised in the above background technology. To achieve the above purpose, the present invention provides the following technical solutions: A granary circulating fumigation device comprises a granary, wherein the granary comprises a base, the base is placed on the ground, the base is fixedly connected to a side enclosure, the side enclosure is fixedly connected to a top cover, four nozzle mechanisms are evenly fixedly connected to the top cover, the nozzle mechanism comprises a mounting cylinder, the mounting cylinder is fixedly connected to the top cover, a driving assembly and a nozzle assembly are arranged on the mounting cylinder, two symmetrical pressurizing assemblies are arranged on the nozzle assembly, and the pressurizing assembly is connected to the driving assembly via a connecting rod.

[0005] An air guide tube 1 is fixedly connected to the nozzle assembly, and four air guide tubes 1 are fixedly connected to five-way joints, and air guide tube 2 is fixedly connected to the five-way joint. Air guide tube 2 is connected to the air outlet end of the air pump, and air guide tube 3 is fixedly connected to the air inlet end of the air pump. A hollow disk is fixedly connected to the base, and air guide tube 4 is fixedly connected to the hollow disk. Air guide tubes 3 and 4 are both connected to a switching mechanism, and an air inlet pipe and an air outlet pipe are also fixedly connected to the switching mechanism.

[0006] The air pump and the switching mechanism are fixedly connected to a fixed bracket, and the fixed bracket is placed on the ground.

[0007] Preferably, the driving assembly includes a mounting bracket, the mounting bracket is fixedly connected in the mounting cylinder, the mounting bracket is rotatably connected to a rotating shaft 1, one end of the rotating shaft 1 is fixedly connected to a fan blade, the other end of the rotating shaft 1 is fixedly connected to a bevel gear 1, the mounting bracket is fixedly connected to a connecting seat, the connecting seat and the mounting cylinder are rotatably connected to a rotating shaft 2, the top end of the rotating shaft 2 is fixedly connected to a bevel gear 2, and the bevel gear 1 and the bevel gear 2 are meshing.

[0008] The lower end of the mounting cylinder is fixedly connected to two parallel guide rods, the guide rods are slidably connected to a sliding frame, the bottom end of the rotating shaft is fixedly connected to a crank, the end of the crank is rotatably connected to a slider, and the slider is slidably connected to the sliding frame.

[0009] Preferably, the nozzle assembly includes a connecting sleeve, which is fixedly connected to the mounting cylinder, the lower end of the connecting sleeve is fixedly connected to a connecting plate, the lower end of the connecting plate is fixedly connected to an end head, the end head is provided with a plurality of air outlets, and two symmetrically arranged flexible enclosure plates are fixedly connected to both sides of the connecting plate, and the upper and lower ends of the flexible enclosure plates are respectively fixedly connected to the connecting sleeve and the end head.

[0010] Preferably, the pressurizing assembly includes a slider 2, two of the sliders 2 are slidably connected to the connecting sleeve and the end head respectively, two parallel guide rods 2 are fixedly connected between the two sliders 2, a sliding bracket is slidably connected to the guide rod 2, a pressure roller is rotatably connected to the sliding bracket, and a spring is connected between the sliding bracket and the upper end of the slider 2.

[0011] The sliding bracket is fixedly connected with two symmetrically arranged elastic telescopic guide rods, the connecting sleeve and the end are fixedly connected with two symmetrically arranged flat plates, the flat plates are provided with closed guide grooves, the guide grooves are also provided with non-return slopes, and the elastic telescopic guide rods are slidably connected in the guide grooves.

[0012] Preferably, a connecting rod is fixedly connected to the sliding block 2 at the upper end, the connecting rod is rotatably connected to one end of the connecting rod, and the other end of the connecting rod is rotatably connected to the sliding frame.

[0013] Preferably, the hollow disk comprises a disk body, a plurality of mounting holes are evenly formed on the disk body, and filter plates are fixedly connected to the mounting holes.

[0014] Preferably, the switching mechanism includes a cylinder, which is fixedly connected to a fixed bracket, and both ends of the cylinder are respectively fixedly connected with a sealing plate 1 and a sealing plate 2, and the sealing plate 1 is provided with a through hole 1 and a through hole 2 that are opposite to each other, and the sealing plate 2 is provided with a through hole 3 and a through hole 4 that are opposite to each other, and a center line connecting through hole 1 and through hole 2 is perpendicular to a center line connecting through hole 3 and through hole 4.

[0015] The air guide pipe three is fixedly connected in the through hole one, the air outlet pipe is fixedly connected in the through hole two, the air guide pipe four is fixedly connected in the through hole three, and the air inlet pipe is fixedly connected in the through hole four.

[0016] The sealing plate 1 and the sealing plate 2 are also rotatably connected with a partition, the partition is fixedly connected with a handle, and the sealing plate 1 is fixedly connected with two symmetrically arranged limit blocks, and the handle abuts against one of the limit blocks.

[0017] A method for using a granary circulating fumigation device comprises the following steps: First, connect the container containing poisonous gas with the air inlet pipe, and then start the vacuum pump. The vacuum pump extracts the poisonous gas in the container through air pipe three, the switching mechanism and the air inlet pipe, and then sends the poisonous gas into the nozzle mechanism through air pipe two, the five-way joint and air pipe one, and finally disperses it into the granary from the air outlet.

[0018] When the poison gas passes through the installation cylinder, it will drive the fan blades and the rotating shaft 1 to rotate. The rotating shaft 1 drives the rotating shaft 2 to rotate through the meshing bevel gear 1 and bevel gear 2. The rotating shaft 2 drives the crank fixedly connected to it to rotate. The crank drives the sliding frame to slide back and forth on the guide rod 1 through the slider 1.

[0019] The sliding frame pulls the slider 2 to move back and forth through the connecting rod, and the slider 2 drives the sliding bracket connected to the guide rod 2 to move through the guide rod 2. When the sliding bracket moves inward to the maximum distance, the pressure roller squeezes the flexible side wall onto the connecting plate, and the elastic telescopic guide rod moves to the top of the guide groove in the vertical direction. Under the action of the spring force, the sliding bracket drives the pressure roller to slide down quickly, and the gas in the nozzle assembly is driven out from the air outlet to form a fast airflow, which accelerates the diffusion of the poisonous gas, and then the sliding bracket moves outward. Under the guidance of the inclined guide groove, the sliding bracket moves outward while rising, and finally returns to the horizontal guide groove.

[0020] When the poisonous gas discharged from the air outlet pipe reaches a certain concentration, turn the handle to abut against the limit block on the other side, driving the partition to rotate, so that air duct two and air duct four are connected through the switching mechanism, so that the poisonous gas circulates in the granary, remove the container containing the poisonous gas, and reset the handle after keeping it for a certain period of time to discharge the poisonous gas in the granary from the air outlet pipe. When the gas discharged from the air outlet pipe does not contain poisonous gas, turn off the vacuum pump.

[0021] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, the nozzle mechanism is set up, relying on the flow of poisonous gas in the pipeline as a power source, to perform secondary pressurization on the poisonous gas input into the granary, thereby increasing the flow rate of the poisonous gas, allowing the poisonous gas to diffuse faster in the granary, and improving the efficiency of fumigation.

[0022] 2. In the present invention, the switching mechanism is provided to switch the flow direction of the poison gas by turning the handle. Compared with the existing control method of multiple valve combinations, the structure and operation are simpler, and the use and maintenance are more convenient.

[0023] 3. In the present invention, the multiple filter plates arranged on the hollow disk can evenly absorb the gas in the granary, so that the poisonous gas can be evenly diffused in the granary, ensuring the insect prevention effect, and the filter plates can also filter the dust in the granary to prevent excessive dust from adhering to the vacuum pump and reducing the efficiency of the vacuum pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of a partial cross-sectional structure of the present invention; Figure 3 It is a structural schematic diagram of the nozzle mechanism in the present invention; Figure 4 is a schematic cross-sectional structure diagram of a driving assembly in the present invention; Figure 5 It is a structural schematic diagram of the pressurizing component in the present invention; Figure 6 It is a structural schematic diagram of the sliding bracket in the present invention; Figure 7 It is a schematic diagram of the structure of the flat plate in the present invention; Figure 8 It is a structural schematic diagram of the switching mechanism in the present invention; Fig. 9 It is a schematic cross-sectional structure diagram of the switching mechanism in the present invention.

[0025] In the figure: 1. granary; 101. base; 102. side wall; 103. top cover; 2. nozzle mechanism; 21. mounting cylinder; 22. drive assembly; 2201. mounting bracket; 2202. rotating shaft 1; 2203. fan blade; 2204. bevel gear 1; 2205. connecting seat; 2206. rotating shaft 2; 2207. bevel gear 2; 2208. guide rod 1; 2209. sliding frame; 2210. crank; 2211. slider 1; 23. nozzle assembly; 2301. connecting sleeve; 2302. connecting plate; 2303. end; 2304. air outlet; 2305. flexible enclosure; 24. pressurizing assembly; 2401. slider 2; 2402. guide rod 2; 2403. sliding bracket; 2404. Pressure roller; 2405, spring; 2406, elastic telescopic guide rod; 2407, flat plate; 2408, guide groove; 2409, check slope; 25, connecting rod; 3, air guide pipe one; 4, five-way joint; 5, air guide pipe two; 6, vacuum pump; 7, air guide pipe three; 8, hollow disk; 801, disk body; 802, mounting hole; 803, filter plate; 9, air guide pipe four; 10, 1001, cylinder; 1002, sealing plate one; 1003, sealing plate two; 1004, through hole one; 1005, through hole two; 1006, through hole three; 1007, through hole four; 1008, partition; 1009, handle; 1010, limit block; switching mechanism; 11, air inlet pipe; 12, air outlet pipe; 13, fixed bracket; 14, connecting rod. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technical personnel in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figures 1 to 9 , the present invention provides a technical solution: A granary circulating fumigation device comprises a granary 1, wherein the granary 1 comprises a base 101, wherein the base 101 is placed on the ground, wherein the base 101 is fixedly connected with a side enclosure 102, wherein the side enclosure 102 is fixedly connected with a top cover 103, wherein four nozzle mechanisms 2 are evenly fixedly connected with the top cover 103, wherein the nozzle mechanisms 2 comprise a mounting cylinder 21, wherein the mounting cylinder 21 is fixedly connected with the top cover 103, wherein a driving assembly 22 and a nozzle assembly 23 are arranged on the mounting cylinder 21, wherein the nozzle assembly 23 is provided with two symmetrical pressurizing assemblies 24, wherein the pressurizing assembly 24 is connected with the driving assembly 22 via a connecting rod 25.

[0028] An air guide pipe 1 3 is fixedly connected to the nozzle assembly 23, and four air guide pipes 1 3 are fixedly connected to five-way joints 4, and an air guide pipe 2 5 is fixedly connected to the five-way joint 4. The air guide pipe 2 5 is connected to the air outlet end of the air pump 6, and an air guide pipe 3 7 is fixedly connected to the air inlet end of the air pump 6. A hollow disk 8 is fixedly connected to the base 101, and an air guide pipe 4 9 is fixedly connected to the hollow disk 8. The air guide pipe 3 7 and the air guide pipe 4 9 are both connected to the switching mechanism 10, and the switching mechanism 10 is also fixedly connected to an air inlet pipe 11 and an air outlet pipe 12.

[0029] The air extractor 6 and the switching mechanism 10 are fixedly connected to a fixed bracket 13, and the fixed bracket 13 is placed on the ground.

[0030] In this embodiment, the driving assembly 22 includes a mounting bracket 2201, the mounting bracket 2201 is fixedly connected to the mounting cylinder 21, a rotating shaft 2202 is rotatably connected to the mounting bracket 2201, one end of the rotating shaft 2202 is fixedly connected to a fan blade 2203, the other end of the rotating shaft 2202 is fixedly connected to a bevel gear 2204, a connecting seat 2205 is fixedly connected to the mounting bracket 2201, a rotating shaft 2206 is rotatably connected to the connecting seat 2205 and the mounting cylinder 21, a bevel gear 2207 is fixedly connected to the top of the rotating shaft 2206, and the bevel gear 1 2204 and the bevel gear 2 2207 are meshed.

[0031] The lower end of the mounting cylinder 21 is fixedly connected to two parallel guide rods 2208, and a sliding frame 2209 is slidably connected to the guide rods 2208. The bottom end of the rotating shaft 2206 is fixedly connected to a crank 2210, and the end of the crank 2210 is rotatably connected to a slider 2211, and the slider 2211 is slidably connected in the sliding frame 2209.

[0032] In this embodiment, the nozzle assembly 23 includes a connecting sleeve 2301, which is fixedly connected to the mounting cylinder 21. The lower end of the connecting sleeve 2301 is fixedly connected to a connecting plate 2302. The lower end of the connecting plate 2302 is fixedly connected to an end head 2303. The end head 2303 is provided with a plurality of air outlets 2304. Two symmetrically arranged flexible enclosure plates 2305 are fixedly connected on both sides of the connecting plate 2302. The upper and lower ends of the flexible enclosure plates 2305 are respectively fixedly connected to the connecting sleeve 2301 and the end head 2303.

[0033] In this embodiment, the pressurizing component 24 includes a slider 2401, and the two sliders 2401 are respectively slidably connected to the connecting sleeve 2301 and the end 2303, and two parallel guide rods 2402 are fixedly connected between the two sliders 2401. A sliding bracket 2403 is slidably connected to the guide rod 2402, and a pressure roller 2404 is rotatably connected to the sliding bracket 2403. A spring 2405 is connected between the sliding bracket 2403 and the slider 2401 at the upper end.

[0034] The sliding bracket 2403 is fixedly connected with two symmetrically arranged elastic telescopic guide rods 2406, and the connecting sleeve 2301 and the end 2303 are fixedly connected with two symmetrically arranged flat plates 2407. The flat plates 2407 are provided with closed guide grooves 2408, and the guide grooves 2408 are also provided with check slopes 2409. The elastic telescopic guide rods 2406 are slidably connected in the guide grooves 2408.

[0035] In this embodiment, the presence of the spring 2405 enables the pressure roller 2404 to move downward rapidly under the action of elastic force after moving to a specific position, thereby greatly enhancing the flow rate of the poison gas discharged from the gas outlet 2304 and achieving the effect of accelerating the diffusion of the poison gas.

[0036] In this embodiment, the pressure roller 2404 rotatably connected to the sliding bracket 2403 can effectively reduce the friction when moving downward, thereby increasing the descending speed of the sliding bracket 2403 and ensuring the enhancement effect of the poison gas flow rate.

[0037] In this embodiment, the non-return slope 2409 enables the elastic telescopic guide rod 2406 to move only in a single line in the guide groove 2408, thereby ensuring the smooth operation of the device.

[0038] In this embodiment, a connecting rod 14 is fixedly connected to the slider 2 2401 at the upper end. The connecting rod 14 is rotatably connected to one end of a connecting rod 25 , and the other end of the connecting rod 25 is rotatably connected to the sliding frame 2209 .

[0039] In this embodiment, the hollow disk 8 includes a disk body 801 , and a plurality of mounting holes 802 are evenly opened on the disk body 801 . A filter plate 803 is fixedly connected to the mounting holes 802 .

[0040] In this embodiment, the switching mechanism 10 includes a cylinder 1001, and the cylinder 1001 is fixedly connected to a fixed bracket 13. The two ends of the cylinder 1001 are respectively fixedly connected with a sealing plate 1002 and a sealing plate 1003. The sealing plate 1002 is provided with a through hole 1004 and a through hole 1005 that are opposite to each other. The sealing plate 1003 is provided with a through hole 3 1006 and a through hole 4 1007 that are opposite to each other. The center line of the through hole 1004 and the through hole 2 1005 is perpendicular to the center line of the through hole 3 1006 and the through hole 4 1007.

[0041] The air guide pipe three 7 is fixedly connected in the through hole one 1004, the air outlet pipe 12 is fixedly connected in the through hole two 1005, the air guide pipe four 9 is fixedly connected in the through hole three 1006, and the air inlet pipe 11 is fixedly connected in the through hole four 1007.

[0042] The sealing plate 1 1002 and the sealing plate 2 1003 are also rotatably connected with a partition 1008 , and the partition 1008 is fixedly connected with a handle 1009 . The sealing plate 1 1002 is fixedly connected with two symmetrically arranged limit blocks 1010 , and the handle 1009 abuts against one of the limit blocks 1010 .

[0043] In this embodiment, the partition 1008 and the sealing plate 1 1002, the sealing plate 2 1003 and the cylinder 1001 are well sealed to avoid gas leakage causing the fumigation effect to deteriorate.

[0044] A method for using a granary circulating fumigation device comprises the following steps: First, connect the container containing poisonous gas with the air inlet pipe 11, and then start the vacuum pump 6. The vacuum pump 6 extracts the poisonous gas in the container through the air guide pipe three 7, the switching mechanism 10 and the air inlet pipe 11, and then sends the poisonous gas into the nozzle mechanism 2 through the air guide pipe two 5, the five-way joint 4 and the air guide pipe one 3, and finally disperses it into the granary 1 from the air outlet 2304.

[0045] When the poison gas passes through the installation cylinder 21, it will drive the fan blades 2203 and the rotating shaft 2202 to rotate. The rotating shaft 2202 drives the rotating shaft 2206 to rotate through the meshing bevel gear 1 2204 and the bevel gear 2 2207. The rotating shaft 2206 drives the crank 2210 fixedly connected thereto to rotate. The crank 2210 drives the sliding frame 2209 to slide back and forth on the guide rod 1 2208 through the slider 1 2211.

[0046] The sliding frame 2209 pulls the sliding block 2401 to move back and forth through the connecting rod 25, and the sliding block 2401 drives the sliding bracket 2403 slidably connected to the guide rod 2402 to move through the guide rod 2402. When the sliding bracket 2403 moves inward to the maximum distance, the pressure roller 2404 squeezes the flexible side enclosure 102 onto the connecting plate 2302, and the elastic telescopic guide rod 2406 moves to the top of the guide groove 2408 in the vertical direction. Under the action of the elastic force of the spring 2405, the sliding bracket 2403 drives the pressure roller 2404 to slide down quickly, and the gas in the nozzle assembly 23 is driven out from the gas outlet 2304, forming a fast airflow to accelerate the diffusion of the poisonous gas, and then the sliding bracket 2403 moves outward, and under the guidance of the inclined guide groove 2408, the sliding bracket 2403 moves outward while rising, and finally returns to the horizontal guide groove 2408.

[0047] When the poisonous gas discharged from the air outlet pipe 12 reaches a certain concentration, turn the handle 1009 to abut against the limit block 1010 on the other side, driving the partition 1008 to rotate, so that the air guide pipe 2 5 and the air guide pipe 4 9 are connected through the switching mechanism 10, so that the poisonous gas circulates in the granary 1, remove the container containing the poisonous gas, and reset the handle 1009 after keeping it for a certain period of time, and discharge the poisonous gas in the granary 1 from the air outlet pipe 12. After the gas discharged from the air outlet pipe 12 does not contain poisonous gas, turn off the vacuum pump 6.

[0048] The above shows and describes the basic principles, main features and advantages of the present invention. Technical personnel in this industry should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A granary circulating fumigation device, comprising a granary (1), the granary (1) comprising a base (101), the base (101) being placed on the ground, the base (101) being fixedly connected to a side enclosure (102), the side enclosure (102) being fixedly connected to a top cover (103), characterized in that: Four nozzle mechanisms (2) are evenly fixedly connected to the top cover (103), the nozzle mechanism (2) comprising a mounting cylinder (21), the mounting cylinder (21) being fixedly connected to the top cover (103), the mounting cylinder (21) being provided with a driving assembly (22) and a nozzle assembly (23), the nozzle assembly (23) being provided with two symmetrical pressurizing assemblies (24), the pressurizing assemblies (24) being connected to the driving assembly (22) via a connecting rod (25); The nozzle assembly (23) is fixedly connected to an air guide pipe 1 (3), the four air guide pipes 1 (3) are fixedly connected to a five-way joint (4), the five-way joint (4) is fixedly connected to an air guide pipe 2 (5), the air guide pipe 2 (5) is connected to the air outlet end of the air pump (6), the air guide pipe 3 (7) is fixedly connected to the air inlet end of the air pump (6), the base (101) is fixedly connected to a hollow disk (8), the hollow disk (8) is fixedly connected to an air guide pipe 4 (9), the air guide pipe 3 (7) and the air guide pipe 4 (9) are both connected to a switching mechanism (10), and the switching mechanism (10) is also fixedly connected to an air inlet pipe (11) and an air outlet pipe (12); The air extractor (6) and the switching mechanism (10) are fixedly connected to a fixed bracket (13), and the fixed bracket (13) is placed on the ground.

2. A granary circulating fumigation device according to claim 1, characterized in that: The driving assembly (22) comprises a mounting bracket (2201), the mounting bracket (2201) being fixedly connected to the mounting cylinder (21), a rotating shaft 1 (2202) being rotatably connected to the mounting bracket (2201), a fan blade (2203) being fixedly connected to one end of the rotating shaft 1 (2202), a bevel gear 1 (2204) being fixedly connected to the other end of the rotating shaft 1 (2202), a connecting seat (2205) being fixedly connected to the mounting bracket (2201), a rotating shaft 2 (2206) being rotatably connected to the connecting seat (2205) and the mounting cylinder (21), a bevel gear 2 (2207) being fixedly connected to the top end of the rotating shaft 2 (2206), and the bevel gear 1 (2204) and the bevel gear 2 (2207) being meshed; The lower end of the mounting cylinder (21) is fixedly connected to two parallel guide rods (2208); a sliding frame (2209) is slidably connected to the guide rod (2208); a crank (2210) is fixedly connected to the bottom end of the rotating shaft (2206); a slider (2211) is rotatably connected to the end of the crank (2210); and the slider (2211) is slidably connected to the sliding frame (2209).

3. A granary circulating fumigation device according to claim 1, characterized in that: The nozzle assembly (23) comprises a connecting sleeve (2301), wherein the connecting sleeve (2301) is fixedly connected to the mounting cylinder (21), the lower end of the connecting sleeve (2301) is fixedly connected to a connecting plate (2302), the lower end of the connecting plate (2302) is fixedly connected to an end head (2303), the end head (2303) is provided with a plurality of air outlets (2304), and two symmetrically arranged flexible enclosure plates (2305) are fixedly connected to both sides of the connecting plate (2302), and the upper and lower ends of the flexible enclosure plates (2305) are respectively fixedly connected to the connecting sleeve (2301) and the end head (2303).

4. A granary circulating fumigation device according to claim 3, characterized in that: The pressurizing component (24) comprises a second slider (2401), the two second sliders (2401) are slidably connected to the connecting sleeve (2301) and the end (2303), respectively, two parallel second guide rods (2402) are fixedly connected between the two second sliders (2401), a sliding bracket (2403) is slidably connected to the second guide rod (2402), a pressure roller (2404) is rotatably connected to the sliding bracket (2403), and a spring (2405) is connected between the sliding bracket (2403) and the second slider (2401) at the upper end; The sliding bracket (2403) is fixedly connected to two symmetrically arranged elastic telescopic guide rods (2406); the connecting sleeve (2301) and the end head (2303) are fixedly connected to two symmetrically arranged flat plates (2407); a closed guide groove (2408) is provided on the flat plate (2407); a non-return slope (2409) is further provided in the guide groove (2408); and the elastic telescopic guide rod (2406) is slidably connected in the guide groove (2408).

5. A granary circulating fumigation device according to claim 4, characterized in that: The second slider (2401) at the upper end is fixedly connected with a connecting rod (14), the connecting rod (14) is rotatably connected to one end of a connecting rod (25), and the other end of the connecting rod (25) is rotatably connected to the sliding frame (2209).

6. A granary circulating fumigation device according to claim 1, characterized in that: The hollow disk (8) comprises a disk body (801), a plurality of mounting holes (802) are evenly formed on the disk body (801), and a filter plate (803) is fixedly connected to the mounting holes (802).

7. A granary circulating fumigation device according to claim 1, characterized in that: The switching mechanism (10) comprises a cylinder (1001), the cylinder (1001) being fixedly connected to a fixed bracket (13), the two ends of the cylinder (1001) being fixedly connected to a sealing plate 1 (1002) and a sealing plate 2 (1003), respectively, the sealing plate 1 (1002) being provided with a through hole 1 (1004) and a through hole 2 (1005) which are opposite to each other, the sealing plate 2 (1003) being provided with a through hole 3 (1006) and a through hole 4 (1007) which are opposite to each other, and the center line of the through hole 1 (1004) and the through hole 2 (1005) being perpendicular to the center line of the through hole 3 (1006) and the through hole 4 (1007); The air guide pipe three (7) is fixedly connected to the through hole one (1004), the air outlet pipe (12) is fixedly connected to the through hole two (1005), the air guide pipe four (9) is fixedly connected to the through hole three (1006), and the air inlet pipe (11) is fixedly connected to the through hole four (1007); The sealing plate 1 (1002) and the sealing plate 2 (1003) are also rotatably connected to a partition plate (1008), the partition plate (1008) is fixedly connected to a handle (1009), and the sealing plate 1 (1002) is fixedly connected to two symmetrically arranged limit blocks (1010), and the handle (1009) abuts against one of the limit blocks (1010).

8. The method for using the granary circulating fumigation device according to any one of claims 1 to 7, characterized in that: The steps include: First, the container containing the poisonous gas is connected to the air inlet pipe (11), and then the air extractor (6) is started. The air extractor (6) extracts the poisonous gas in the container through the air guide pipe three (7), the switching mechanism (10) and the air inlet pipe (11), and then the poisonous gas is sent to the nozzle mechanism (2) through the air guide pipe two (5), the five-way joint (4) and the air guide pipe one (3), and finally dispersed into the granary (1) from the air outlet (2304); When the poison gas passes through the mounting cylinder (21), the fan blades (2203) and the rotating shaft 1 (2202) are driven to rotate. The rotating shaft 1 (2202) drives the rotating shaft 2 (2206) to rotate through the meshing bevel gear 1 (2204) and the bevel gear 2 (2207). The rotating shaft 2 (2206) drives the crank (2210) fixedly connected thereto to rotate. The crank (2210) drives the sliding frame (2209) to slide back and forth on the guide rod 1 (2208) through the slider 1 (2211). The sliding frame (2209) pulls the sliding block (2401) to move back and forth through the connecting rod (25), and the sliding block (2401) drives the sliding bracket (2403) connected to the guiding rod (2402) to move through the guiding rod (2402). When the sliding bracket (2403) moves inward to the maximum distance, the pressing roller (2404) squeezes the flexible side circumference (102) onto the connecting plate (2302), and the elastic telescopic guide rod (2406) moves to the guiding groove in the vertical direction. At the top of the nozzle assembly (2408), under the action of the elastic force of the spring (2405), the sliding bracket (2403) drives the pressure roller (2404) to slide down quickly, and the gas in the nozzle assembly (23) is driven out from the gas outlet (2304), forming a fast airflow, accelerating the diffusion of the poisonous gas, and then the sliding bracket (2403) moves outward, under the guidance of the inclined guide groove (2408), the sliding bracket (2403) moves outward while rising, and finally returns to the horizontal guide groove (2408); When the poisonous gas discharged from the air outlet pipe (12) reaches a certain concentration, the handle (1009) is turned to abut against the limit block (1010) on the other side, driving the partition (1008) to rotate, so that the air guide pipe 2 (5) and the air guide pipe 4 (9) are connected through the switching mechanism (10), so that the poisonous gas circulates in the granary (1), and the container containing the poisonous gas is removed. After a certain period of time, the handle (1009) is reset to discharge the poisonous gas in the granary (1) from the air outlet pipe (12). After the gas discharged from the air outlet pipe (12) does not contain poisonous gas, the exhaust fan (6) is turned off.

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