Roadway circulation fumigation system suitable for seed stack

Abstract

The utility model relates to the technical field of seed fumigation, in particular to a roadway circulation fumigation system suitable for a seed stack, which comprises a layer-changing transfer device, a circulation fumigation device, a tail gas treatment device, a mechanical ventilation device and at least one group of roadways, the layer-changing transfer device is used for conveying the seed stacks into the roadway; the circulation fumigation device is communicated with each roadway and is used for introducing a fumigant into each roadway for seed fumigation; the tail gas treatment device is communicated with the circulation fumigation device and is used for purifying and discharging tail gas generated in each roadway; and the mechanical ventilation device is communicated with the circulation fumigation device and is used for ventilating each roadway. The seed fumigating device can shorten the fumigating time, save the production cost, ensure that the concentration of the fumigant in the roadway is uniform and the fumigant is in full contact with the seeds, improve the utilization rate of the fumigant and improve the seed fumigating quality.

Description

TECHNICAL FIELD

[0001] The utility model belongs to fumigation equipment technical field, especially suitable for seed pile's roadway circulation fumigation system. BACKGROUND

[0002] Seed fumigation is an effective seed treatment method, through fumigation can kill the pests in different growth stages inside and outside the seed, at the same time inhibit or kill the seed disease, reduce the spread risk of disease and pest, improve seed quality, prolong seed storage period, reduce pest loss effect remarkable etc.

[0003] At present, the warehouse fumigation and warehouse fumigation are generally used in the market, the warehouse fumigation is directly to the seed particle fumigation, and the finished product bagged seed uses the warehouse fumigation, needs to break the bag and fills the warehouse, and after fumigation, packs again, increases the production cost, and the finished product seed is transported again, will certainly produce the broken, causes the economic loss. Warehouse fumigation is more suitable for directly with the seed fumigation of granular storage, and the seed warehouse is used for finished product bag storage, and the internal space of seed warehouse is far greater than the space of finished product bag storage, so that the construction cost of fumigation system is higher, and the drug amount is difficult to control and fumigation is uneven during fumigation, finally leads to the poor fumigation quality. UTILITY MODEL CONTENT

[0004] Therefore, the utility model creates and provides a roadway circulation fumigation system suitable for seed pile, to solve the technical problem that the existing seed fumigation method is not suitable for fumigation of the seed already in finished product bag.

[0005] To achieve the above object, the technical scheme of the utility model creates is realized as follows:

[0006] The application discloses a kind of suitable for seed stack's lane circulation fumigation system, including layer transfer device, circulation fumigation device, tail gas treatment device and mechanical ventilation device and at least one group of lane, each group of lane includes at least two superimposed lane;Wherein, each lane is closed structure, and sealing door is respectively arranged at each lane entrance, and transfer buffer is respectively arranged outside the sealing door of each lane;Layer transfer device includes detection conveying equipment, vertical layer-changing conveying equipment, transfer conveyor, automatic guided vehicle;Wherein, detection conveying equipment is arranged on ground, for shape detection to seed stack, and the seed stack of detection qualified is sent to vertical layer-changing conveying equipment;Vertical layer-changing conveying equipment is arranged between detection conveying equipment and lane, for lifting seed stack to the transfer buffer of each layer;Automatic guided vehicle and transfer conveyor are respectively arranged on the transfer buffer of each lane, and transfer conveyor is used to send the seed stack of vertical layer-changing conveying equipment to transfer buffer, and automatic guided vehicle is used to send the seed stack on transfer conveyor to lane;The circulation fumigation device is connected with each lane respectively, for introducing fumigant into each lane to carry out seed fumigation;Tail gas treatment device is connected with circulation fumigation device, for purifying and discharging the tail gas generated in each lane;Mechanical ventilation device is connected with circulation fumigation device, for ventilation to each lane.

[0007] Further, detection conveying equipment includes first conveyor and shape detector, shape detector is arranged on first conveyor, and shape detector is door frame structure, and photoelectric range finder for detecting the shape of seed stack is arranged on door frame structure.

[0008] Further, detection conveying equipment further includes weighing platform for weighing seed stack, and first conveyor is installed on weighing platform.

[0009] Further, vertical layer-changing conveying equipment includes column frame, base, second conveyor, hydraulic cylinder, top shaft, chain and fixed beam;Wherein, base is installed on the inner bottom of column frame, and second conveyor is installed on base;The number of hydraulic cylinder, top shaft, chain and fixed beam is two respectively, two hydraulic cylinders are respectively installed on opposite sides in column frame, and the cylinder bottom of each hydraulic cylinder is fixedly connected with the bottom of column frame respectively, and the end of piston rod of each hydraulic cylinder is connected with corresponding top shaft respectively, and two sprockets matched with two chains are respectively installed on each top shaft;Two fixed beams are respectively fixed on opposite sides in column frame, and one end of each chain is respectively fixed on corresponding fixed beam, and the other end of each chain is respectively fixed on base.

[0010] Further, the circulating fumigation device comprises a fumigant reactor, an entry tunnel main pipeline, a circulating pipeline, a circulating fan, as many entry tunnel branch pipelines as the number of tunnels, and as many exit tunnel branch pipelines as the number of tunnels; the fumigant reactor is in communication with one end of the entry tunnel main pipeline, the other end of the entry tunnel main pipeline is in communication with one end of each entry tunnel branch pipeline, the other end of each entry tunnel branch pipeline is in communication with an input port of a corresponding tunnel, one end of each exit tunnel branch pipeline is in communication with an output port of a corresponding tunnel; the circulating pipeline comprises an air inlet pipeline and an air outlet pipeline, the other end of each exit tunnel branch pipeline is in communication with one end of the air inlet pipeline, the other end of the air inlet pipeline is in communication with an air inlet of the circulating fan, and an air outlet of the circulating fan is in communication with each entry tunnel branch pipeline through the air outlet pipeline; a main pipeline butterfly valve is arranged on the entry tunnel main pipeline, an entry tunnel valve and an entry tunnel branch pipeline butterfly valve are sequentially arranged on each entry tunnel branch pipeline along the flow direction of the fumigant, an exit tunnel valve is arranged on each exit tunnel branch pipeline, a circulating valve is arranged on the air inlet pipeline, and a check valve is arranged on each exit tunnel branch pipeline and located between the entry tunnel valve and the entry tunnel branch pipeline butterfly valve.

[0011] Further, the tail gas treatment device comprises a purification device, a tail gas fan, a chimney, and as many tail gas pipelines as the number of tunnels, one end of each tail gas pipeline is in communication with an exit tunnel branch pipeline, the other end of each tail gas pipeline is in communication with an inlet of the purification device, an outlet of the purification device is in communication with an air inlet of the tail gas fan, an air outlet of the tail gas fan is in communication with the chimney, and a tail gas valve is arranged on each tail gas pipeline.

[0012] Further, the mechanical ventilation device comprises as many ventilation pipelines as the number of tunnels, one end of each ventilation pipeline is in communication with the chimney, the other end of each ventilation pipeline is in communication with an exit tunnel branch pipeline, and a ventilation valve is arranged on each ventilation pipeline.

[0013] Compared with the prior art, the utility model can achieve the following beneficial effects:

[0014] By arranging multiple groups of stacked tunnels, the seed stacks are divided into categories and batches and are translated into the same tunnel or different tunnels by using the layer-changing transfer device, flexible matching can be achieved, the transfer process is free of damage and breakage, the fumigated seeds do not need to be packaged again, production cost is saved, the overall space of the tunnel is compact, the sealing performance is good, the concentration of the fumigant in the tunnel is uniform and can fully contact the seeds, the utilization rate of the fumigant is improved, the fumigation time is shortened, the tail gas treatment device and the mechanical ventilation device are matched, the fumigated tail gas is purified by using the tail gas treatment device to meet the national emission standard and is quickly discharged to protect the ecological environment, the mechanical ventilation device is further used to remove harmful gases remaining in the seed stacks, promotes the convection of the gas in the tunnel, removes the water vapor and heat accumulated in the seed stacks, and improves the fumigation quality of the seeds. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings, which form a part of the present application, are used to provide further understanding of the present application and are incorporated herein for explanation along with the description of the present application. The illustrative embodiments of the present application, as well as those intended to limit the present application, are described and explained with additional detail through the use of accompanying drawings in which:

[0016] Figure 1 A schematic diagram of the overall structure of the lane circulating fumigation system suitable for seed piles according to the embodiments of the present application;

[0017] Figure 2 A schematic diagram of the structure of the layer-changing transfer device according to the embodiments of the present application;

[0018] Figure 3 A schematic diagram of the structure of the detection conveying equipment according to the embodiments of the present application;

[0019] Figure 4 A schematic diagram of the structure of the vertical layer-changing conveying equipment according to the embodiments of the present application;

[0020] Figure 5 A schematic diagram of the structure of the circulating fumigation device, tail gas treatment device and mechanical ventilation device according to the embodiments of the present application.

[0021] Legend of reference signs: lane 1, sealing door 11, transfer buffer 12, layer-changing transfer device 2, detection conveying equipment 21, first conveyor 211, shape detector 212, weighing table 213, vertical layer-changing conveying equipment 22, stand column frame 221, base 222, second conveyor 223, hydraulic cylinder 224, top shaft 225, chain 226, fixed beam 227, transfer conveyor 23, automatic guided vehicle 24, circulating fumigation device 3, fumigant reactor 31, circulating fan 32, main path butterfly valve 33, branch path butterfly valve 34, lane inlet valve 35, lane outlet valve 36, circulating valve 37, check valve 38, tail gas treatment device 4, purification equipment 41, tail gas fan 42, chimney 43, tail gas valve 44, mechanical ventilation device 5, ventilation valve 51, seed pile 6. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and do not constitute a limitation on the present application.

[0023] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0024] In the description of the utility model, it needs to be understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or position relationship shown based on the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more features. In the description of the utility model, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0025] In the description of the utility model, it needs to be understood that the terms "installation", "connection", "connection" should be understood in a broad sense, unless otherwise specified and limited, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood through specific circumstances.

[0026] The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0027] As Figures 1-5 shown, the utility model embodiment provides a tunnel circulating fumigation system suitable for seed ridge, which comprises a tunnel 1, a layer changing and transferring device 2, a circulating fumigation device 3, a tail gas treatment device 4 and a mechanical ventilation device 5, the number of the tunnel 1 is at least one group, each group of tunnels comprises at least two tunnels 1 stacked one on another; wherein each tunnel 1 is a closed structure, and each tunnel 1 is provided with a sealing door 11 at the entrance, for realizing the sealing of the tunnel 1, opening the sealing door 11 when transporting the seed ridge 6, closing the sealing door 11 after the transportation is completed, and each tunnel 1 is provided with a transfer buffer 12 outside the sealing door 11.

[0028] The layer changing and transferring device 2 comprises a detection conveying device 21, a vertical layer changing conveying device 22, a transferring conveyor 23 and an automatic guided vehicle 24. The detection conveying device 21 is arranged on the ground and is used for detecting the shape of the seed stack 6 and conveying the seed stack 6 meeting the detection requirement to the vertical layer changing conveying device 22. The vertical layer changing conveying device 22 is arranged between the detection conveying device 21 and the roadway 1 and is used for lifting the seed stack 6 to the transferring buffer 12 of each layer. The transferring conveyor 23 and the automatic guided vehicle 24 are arranged on the transferring buffer 12 of each roadway 1 respectively. The transferring conveyor 23 is used for conveying the seed stack 6 conveyed by the vertical layer changing conveying device 22 to the transferring buffer 12. The automatic guided vehicle 24 is used for conveying the seed stack 6 on the transferring conveyor 23 to the roadway 1 of each layer.

[0029] The detection conveying device 21 comprises a first conveyor 211 and a shape detector 212. The shape detector 212 is arranged on the first conveyor 211 and has a door frame structure. A photoelectric range finder is arranged on the door frame structure and is used for detecting the shape of the seed stack 6 to ensure that the seed stack 6 meeting the size requirement passes through the shape detector 212. The detection conveying device 21 further comprises a weighing table 213. The weighing table 213 is arranged above the first conveyor 211 and is used for weighing the seed stack 6 to avoid the seed stack 6 exceeding the load of the vertical layer changing conveying device 22.

[0030] The vertical layer changing conveying device 22 comprises a column frame 221, a base 222, a second conveyor 223, a hydraulic cylinder 224, a top shaft 225, a chain 226 and a fixed beam 227. The base 222 is arranged in the column frame 221 and is located at the bottom of the column frame 221. The second conveyor 223 is arranged on the base 222. The first conveyor 211 conveys the seed stack 6 meeting the detection requirement to the second conveyor 223. The number of the hydraulic cylinder 224, the top shaft 225, the chain 226 and the fixed beam 227 is two respectively. Two hydraulic cylinders 224 are arranged on opposite sides of the column frame 221 respectively. The bottom of each hydraulic cylinder 224 is fixedly connected with the bottom of the column frame 221. The end of the piston rod of each hydraulic cylinder 224 is connected with the corresponding top shaft 225. Two sprockets matched with two chains 226 are arranged on each top shaft 225. Two fixed beams 227 are fixedly arranged on opposite sides of the column frame 221 respectively. One end of each chain 226 is fixedly arranged on the corresponding fixed beam 227. The other end of each chain 226 is fixedly arranged on the base 222. When the piston rod in the hydraulic cylinder 224 is pushed out, the top shaft 225 is pushed up, and then the base 222 is lifted by the chains 226 on both ends of the top shaft 225. The seed stack 6 is lifted synchronously with the base 222 and is transferred to the transferring buffer 12 by the transferring conveyor 23. When the piston rod in the hydraulic cylinder 224 is retracted, the top shaft 225 is lowered, and then the base 222 is lowered and reset.

[0031] The first conveyor 211, the second conveyor 223 and the transfer conveyor 23 are all prior art, and thus the specific structure is not described in the utility model.

[0032] The circulating fumigation device 3 is connected with each of the tunnels 1 respectively, and is used for introducing fumigation agent into each of the tunnels 1 to perform seed fumigation. The circulating fumigation device 3 comprises a fumigation agent reactor 31, a tunnel inlet main pipeline, a circulating pipeline, a circulating fan 32, tunnel inlet branch pipelines with the same number as the tunnels 1 and tunnel outlet branch pipelines with the same number as the tunnels 1; wherein the fumigation agent reactor 31 generates fumigation agent for grain fumigation and insect killing through gas reaction, for example, phosphine fumigation agent mixed by phosphine and carbon dioxide in a certain proportion, the fumigation agent reactor 31 is connected with one end of the tunnel inlet main pipeline, the other end of the tunnel inlet main pipeline is connected with one end of each of the tunnel inlet branch pipelines respectively, the other end of each of the tunnel inlet branch pipelines is connected with an input port of the corresponding tunnel 1 respectively, one end of each of the tunnel outlet branch pipelines is connected with an output port of the corresponding tunnel 1 respectively; the circulating pipeline comprises an air inlet pipeline and an air outlet pipeline, the other end of each of the tunnel outlet branch pipelines is connected with one end of the air inlet pipeline respectively after being combined, the other end of the air inlet pipeline is connected with an air inlet of the circulating fan 32, an air outlet of the circulating fan 32 is connected with each of the tunnel inlet branch pipelines through the air outlet pipeline; a main pipeline butterfly valve 33 is arranged on the tunnel inlet main pipeline, a branch pipeline butterfly valve 34 and a tunnel inlet valve 35 are arranged on each of the tunnel inlet branch pipelines in sequence along the fumigation agent flow direction respectively, a tunnel outlet valve 36 is arranged on each of the tunnel outlet branch pipelines, a circulating valve 37 is arranged on the air inlet pipeline, a check valve 38 is arranged on each of the tunnel outlet branch pipelines respectively, and the check valve 38 is located between the branch pipeline butterfly valve 34 and the tunnel inlet valve 35.

[0033] The tail gas treatment device 4 is connected with the circulating fumigation device 3, and is used for purifying and discharging the tail gas generated in each of the tunnels 1. The tail gas treatment device 4 comprises a purification equipment 41, a tail gas fan 42, a chimney 43 and tail gas pipelines with the same number as the tunnels 1, one end of each of the tail gas pipelines is connected with the tunnel outlet branch pipeline, the other end of each of the tail gas pipelines is connected with an inlet of the purification equipment 41 respectively, an outlet of the purification equipment 41 is connected with an air inlet of the tail gas fan 42, an air outlet of the tail gas fan 42 is connected with the chimney 43, and a tail gas valve 44 is arranged on each of the tail gas pipelines.

[0034] The mechanical ventilation device 5 is connected with the circulating fumigation device 3, and is used for ventilating each of the tunnels 1. The mechanical ventilation device 5 comprises ventilation pipelines with the same number as the tunnels 1, one end of each of the ventilation pipelines is connected with the chimney 43, the other end of each of the ventilation pipelines is connected with the tunnel outlet branch pipeline, and a ventilation valve 51 is arranged on each of the ventilation pipelines.

[0035] The working process of the utility model is as follows:

[0036] S1, the seed stack enters the lane: the finished seed packaging bag or ton bag is placed on the standard tray to form a seed stack 6, and the seed stack 6 is transported horizontally to the vertical layer changing conveying equipment 22 after being inspected by the detection conveying equipment 21, is lifted to the transfer buffer table 12 of the corresponding layer by the vertical layer changing conveying equipment 22, and is transported to the transfer conveyor 23, the automatic guided vehicle 24 on each layer transfer buffer table 12 can transport the seed stack on the transfer conveyor 23 into each lane 1. In this process, the seed stack 6 is translated as a whole into the lane 1, without breaking and damaging, and the fumigated seed does not need to be packaged again, thereby saving a large amount of production cost.

[0037] S2, circulating fumigation: the circulating fumigation adopts layered and lane fumigation, all lanes 1 share a set of fumigant reactor 31, the fumigant reactor 31 only provides fumigant for the lanes 1 of one layer at the same time, only the main road butterfly valve 33 and the branch road butterfly valve 34 of one layer lane 1 are opened during fumigation, and after the fumigant enters the lane, the circulating fumigation is carried out lane by lane, that is, one lane 1 of the layer is first circulated and fumigated, after the fumigant concentration in the lane 1 reaches the preset concentration, the lane valve 35 and the lane valve 36 of the lane 1 are closed, and the lane valve 35 and the lane valve 36 of the next lane 1 of the layer are opened for circulating fumigation, and the same is true for the subsequent lanes 1. After the lanes 1 of the layer are finished, the circulating fumigation is carried out on the lanes 1 of another layer. According to the specifications of the seed stack 6, the lanes 1 are designed to be compact in overall space and good in sealing, which can ensure that the fumigant concentration in the lane 1 is uniform and fully contacts with the seed, improve the utilization rate of the fumigant, and shorten the fumigation time from 14 days to 7-10 days.

[0038] S3, tail gas treatment: after the fumigation of the seed in the lane 1 of a layer is completed, the branch road butterfly valve 34 and the circulating valve 37 of the lane 1 are closed, and the check valve 38, the tail gas valve 44 and the tail gas fan 42 are opened. The tail gas fan 42 generates negative pressure in the lane 1, so that the external air enters the lane 1 through the check valve 38, promotes the fumigant to be quickly discharged through the tail gas valve 44, and is sent to the chimney 43 after being purified by the purification equipment 41. The purified tail gas meets the national emission standard (≤0.3 mg / m³), and will not pollute the environment.

[0039] S4, mechanical ventilation: after the tail gas treatment, the tail gas valve 44 and the tail gas fan 42 are closed, and the ventilation valve 51 and the circulating fan 32 are opened. At this time, the external air enters the lane 1 through the check valve 38, passes through the seed stack 6 and is discharged from the ventilation valve 51, and is directly discharged into the chimney 43. After mechanical ventilation, the harmful gas remaining in the seed stack 6 can be further removed, the convection of the gas in the lane 1 is promoted, the water vapor and heat accumulated in the seed stack 6 are removed, and the fumigation quality of the seed is improved.

[0040] It should be understood that the various forms of flow shown above can be used to reorder, add or delete steps. For example, the steps described in the present disclosure can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solutions of the present disclosure can be achieved, which is not limited herein.

[0041] The above specific embodiments do not constitute a limitation on the scope of protection of the present disclosure. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present disclosure shall be included in the scope of protection of the present disclosure.

Claims

1. A tunnel loop fumigation system suitable for use with a seed silo, characterized by: The system comprises a layer-changing transfer device, a circulating fumigation device, a tail gas treatment device, a mechanical ventilation device and at least one group of tunnels, each group of tunnels comprising at least two tunnels stacked one on another, wherein Each tunnel is of a closed structure, and a sealing door is arranged at the entrance of each tunnel, and a transfer buffer is arranged outside the sealing door of each tunnel; The layer-changing transfer device comprises a detection conveying device, a vertical layer-changing conveying device, a transfer conveyor and an automatic guided vehicle, wherein the detection conveying device is arranged on the ground and is used for detecting the shape of the seed stack and conveying the seed stack that passes the detection to the vertical layer-changing conveying device; the vertical layer-changing conveying device is arranged between the detection conveying device and the tunnels and is used for lifting the seed stack to the transfer buffer of each layer; the transfer conveyor and the automatic guided vehicle are arranged on the transfer buffer of each tunnel, the transfer conveyor is used for conveying the seed stack conveyed by the vertical layer-changing conveying device to the transfer buffer, and the automatic guided vehicle is used for conveying the seed stack on the transfer conveyor to the tunnel; The circulating fumigation device is connected with each tunnel respectively and is used for introducing a fumigant into each tunnel to fumigate the seed; The tail gas treatment device is connected with the circulating fumigation device and is used for purifying and discharging the tail gas generated in each tunnel; The mechanical ventilation device is connected with the circulating fumigation device and is used for ventilating each tunnel.

2. A tunnel recirculation fumigation system suitable for use with a seed pile according to claim 1 characterised in that: The detection conveying device comprises a first conveyor and a shape detector, the shape detector is arranged on the first conveyor, and the shape detector is of a door frame structure and is provided with an optical range finder for detecting the shape of the seed stack.

3. A tunnel recirculation fumigation system suitable for use with a seed pile according to claim 2 characterised in that: The detection conveying device further comprises a weighing table for weighing the seed stack, and the first conveyor is mounted on the weighing table.

4. A tunnel recirculation fumigation system suitable for use with a seed pile according to claim 1 characterised in that: The vertical layer-changing conveying device comprises a column frame, a base, a second conveyor, a hydraulic cylinder, a top shaft, a chain and a fixed beam, wherein the base is mounted on the inner bottom of the column frame, and the second conveyor is mounted on the base; the number of the hydraulic cylinder, the top shaft, the chain and the fixed beam is two respectively, the two hydraulic cylinders are respectively mounted on the opposite sides in the column frame, the cylinder bottom of each hydraulic cylinder is fixedly connected with the bottom of the column frame, the end of the piston rod of each hydraulic cylinder is connected with the corresponding top shaft, and two sprockets matched with the two chains are respectively mounted on each top shaft; the two fixed beams are respectively fixed on the opposite sides in the column frame, one end of each chain is respectively fixed on the corresponding fixed beam, and the other end of each chain is respectively fixed on the base.

5. A tunnel recirculation fumigation system suitable for use with a seed pile according to claim 1, characterized in that: The circulating fumigation device comprises a fumigant reactor, an inlet tunnel main pipeline, a circulating pipeline, a circulating fan, as many inlet tunnel branch pipelines as the number of the tunnels and as many outlet tunnel branch pipelines as the number of the tunnels, wherein The fumigant reactor is connected with one end of the inlet tunnel main pipeline, the other end of the inlet tunnel main pipeline is connected with one end of each inlet tunnel branch pipeline respectively, the other end of each inlet tunnel branch pipeline is connected with the input port of the corresponding tunnel respectively, and one end of each outlet tunnel branch pipeline is connected with the output port of the corresponding tunnel respectively; The circulation pipeline comprises an air inlet pipeline and an air outlet pipeline, the other ends of the branch pipelines of the in-pit air inlets are respectively connected to one ends of the air inlet pipeline, the other end of the air inlet pipeline is connected to an air inlet of the circulation fan, and the air outlet of the circulation fan is connected to the branch pipelines of the in-pit air inlets through the air outlet pipeline; The main pipeline is provided with a main butterfly valve, the branch pipelines of the in-pit air inlets are respectively provided with an in-pit valve and a branch butterfly valve in sequence along the flow direction of the fumigant, the branch pipelines of the out-pit air inlets are respectively provided with an out-pit valve, the air inlet pipeline is provided with a circulation valve, and the branch pipelines of the out-pit air inlets are respectively provided with check valves, which are located between the branch butterfly valves and the in-pit valves.

6. A tunnel recirculation fumigation system suitable for use with a seed pile according to claim 5 characterised in that: The tail gas treatment device comprises a purification device, a tail gas fan, a chimney and tail gas pipelines with the same number as the number of the tunnels, one end of each tail gas pipeline is connected to the branch pipeline of the out-pit air outlet, the other end of each tail gas pipeline is connected to an inlet of the purification device, an outlet of the purification device is connected to an air inlet of the tail gas fan, an air outlet of the tail gas fan is connected to the chimney, and a tail gas valve is arranged on each tail gas pipeline.

7. A tunnel recirculation fumigation system suitable for use with a seed pile according to claim 6 characterised in that: The mechanical ventilation device comprises ventilation pipelines with the same number as the number of the tunnels, one end of each ventilation pipeline is connected to the chimney, the other end of each ventilation pipeline is connected to the branch pipeline of the out-pit air outlet, and a ventilation valve is arranged on each ventilation pipeline.

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