Granary circulation fumigation system and method thereof

Abstract

The invention relates to the technical field of fumigation systems, and discloses a granary circulation fumigation system which comprises an air heater, an air guide cover and a ventilation pipe fixedly communicated with a granary and further comprises a rotary valve assembly, the rotary valve assembly periodically switches the air heater to feed air into the air guide cover and return air through the ventilation pipe, and the air heater feeds air into the ventilation pipe and returns air through the air guide cover. A pressurizing cylinder and a filter cylinder are arranged on the ventilation pipe, a semicircular valve column is rotationally connected to the inner wall of the pressurizing cylinder, a rotatable valve shaft is installed at the bottom end of the semicircular valve column, a spiral dust filtering piece capable of rotating and moving up and down in a reciprocating mode is arranged in the filter cylinder, and a double-end motor is installed on the wind scooper. Through the bidirectional controllable circulation system, the modular dynamic turbulent flow ground cage and the self-cleaning dust filtering structure, the fumigation uniformity, the airflow covering efficiency and the system stability are remarkably improved, meanwhile, flexible expansion is supported, and the core technical bottlenecks of non-uniform gas distribution, dust filtering blockage and poor adaptability in traditional granary fumigation are comprehensively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of fumigation systems, and more specifically, to a grain bin circulating fumigation system and a method thereof. Background Art

[0002] In the prior art, a patent document with the publication number CN102524383B discloses a grain bin circulating fumigation system and a method thereof, including at least one set of circulating devices, and the circulating device includes a return pipe, a circulating fan, a gas distribution box and a floor grille; the top end of the return pipe is arranged above the grain surface, and the lower part of the return pipe is communicated with one end of the circulating fan. The above system can achieve drug feeding outside the bin without the need for operators to enter the bin for drug feeding, reducing the contact time between the operators and the air with drug properties, so the health of the operators can be avoided from being affected due to long-term contact with the air with drug properties. However, the above circulating fumigation system has the following technical problems in use:

[0003] In the field of grain bin circulating fumigation, although the prior art can achieve drug feeding outside the bin to reduce the contact of personnel with drug-containing gases, there are still the following significant technical problems:

[0004] The traditional system only relies on the air flow in a single circulation direction, resulting in uneven distribution of fumigation gas in the grain bin, there are fumigation dead corners, it is difficult to cover all layers and corners of the grain pile, and the risk of pest residues is high. The fixed floor grille structure cannot dynamically adjust the air flow direction, resulting in poor fumigation effect in the bottom and edge areas of the grain pile, and the proportion of fumigation dead corners exceeds 30%, seriously affecting the safety of grain storage;

[0005] Based on this, the present invention provides a grain bin circulating fumigation system and a method thereof to solve the technical problems raised in the above background art. Summary of the Invention

[0006] In order to overcome the deficiencies of the prior art, the present invention provides a grain bin circulating fumigation system and a method thereof. The present invention significantly improves the fumigation uniformity, air flow coverage efficiency and system stability through a two-way controllable circulation system, a modular dynamic flow disturbing floor grille and a self-cleaning dust filtering structure, and at the same time supports flexible expansion, comprehensively solving the core technical bottlenecks of uneven gas distribution, dust filtering blockage and poor adaptability in traditional grain bin fumigation.

[0007] To achieve the above object, the present invention provides the following technical solution: A grain bin circulation fumigation system includes a hot air blower, a wind guiding cover, and a ventilation pipe fixedly connected to the grain bin. It further includes a rotary valve assembly, which periodically switches the hot air blower to supply air to the wind guiding cover and return air through the ventilation pipe, and the hot air blower to supply air to the ventilation pipe and return air through the wind guiding cover. A pressurizing cylinder and a filter cylinder are respectively arranged on the ventilation pipe. The inner wall of the pressurizing cylinder is rotatably connected with a semi-circular valve column, and the bottom end of the semi-circular valve column is provided with a rotatable valve shaft. A spiral dust filter sheet that can rotate and reciprocate up and down is arranged in the filter cylinder. A double-headed motor is installed on the wind guiding cover, and a transmission shaft driven by the double-headed motor is rotatably installed on the wind guiding cover. The other end of the wind guiding cover is communicated with a modularly spliceable floor cage unit;

[0008] The floor cage unit includes a cage frame. An air distribution opening is formed at the top of the cage frame. A ventilation net cylinder is rotatably installed on the inner wall of the cage frame. A wind guiding arc plate is rotatably installed on the inner wall of the ventilation net cylinder. The ventilation net cylinder and the wind guiding arc plate are driven by the double-headed motor and rotate coaxially in opposite directions.

[0009] As a preferred technical solution of the present invention, the rotary valve assembly includes a fixed valve cylinder. An upper support cylinder is communicated between the fixed valve cylinder and the air inlet port of the hot air blower. An electromagnetic air compensation valve is communicated with the upper support cylinder. The electromagnetic air compensation valve is communicated with the fumigation drug supply device. A lower support cylinder is communicated between the fixed valve cylinder and the air outlet port of the hot air blower. The tail end of the wind guiding cover is communicated with the fixed valve cylinder. A lower conduit is communicated between the fixed valve cylinder and the wind guiding cover. A movable valve cylinder is slidably installed on the inner wall of the fixed valve cylinder. A pair of valve holes are formed at the bottom of the movable valve cylinder and are arranged towards the upper support cylinder and the lower support cylinder. A wind guiding ring groove is arranged on the movable valve cylinder at a position corresponding to the upper part of the valve holes. An upper conduit is slidably communicated with the inner wall of the movable valve cylinder. The other end of the upper conduit is communicated with the filter cylinder. A support is installed on the fixed valve cylinder. A reciprocating drive module for driving the valve cylinder to reciprocate along the axis of the fixed valve cylinder is arranged on the support.

[0010] As a preferred technical solution of the present invention, the top end of the movable valve cylinder is open and the bottom end is closed. The axes of the valve holes, the upper support cylinder, and the lower support cylinder are all perpendicular to the axis of the movable valve cylinder. The lower support cylinder is coaxially arranged with the wind guiding cover.

[0011] As a preferred technical solution of the present invention, as a preferred technical solution of the present invention, the reciprocating drive module includes a reduction gear group installed on an output shaft end of a double-headed motor and a reduction shaft and a reciprocating screw rotatably connected to the bracket, the reduction shaft is driven by the reduction gear group, a first half-tooth gear is installed on the reduction shaft, a torsion spring is provided at the rotating connection between the reciprocating screw and the bracket, the reciprocating screw is transmission-connected to the moving valve cylinder, the bottom end of the reciprocating screw is fixedly installed with a first driven gear transmission-connected to the first half-tooth gear, and the bottom of the valve shaft is installed with a second driven gear transmission-connected to the first half-tooth gear.

[0012] As a preferred technical solution of the present invention, it also includes a dust vibrating frame and a dust vibrating shaft rotatably connected to the dust vibrating frame, a group of elastic reset parts are installed between the dust vibrating frame and the bracket, the spiral dust filter is fixedly installed on the dust vibrating shaft, the dust vibrating shaft is driven by a reduction shaft, an upper gear shaft and a lower gear shaft are rotatably installed on the bracket, the upper gear shaft is connected to the lower gear shaft through a belt, a driven bevel gear is installed on the lower gear shaft and the reduction shaft, the two driven bevel gears are meshed with each other, a second half-tooth gear is installed on the upper gear shaft, a vibrating tooth plate is installed on the dust vibrating frame, and the second half-tooth gear is connected to the vibrating tooth plate through transmission.

[0013] As a preferred technical solution of the present invention, the spiral dust filter is evenly distributed with vertically arranged dust filter mesh holes, the axis of the dust filter mesh holes is parallel to the axis of the filter cartridge, a synchronous groove with an opening at the bottom is fixedly provided inside the dust vibration shaft, a synchronous transmission section slidingly connected to the synchronous groove is fixedly provided on the reduction shaft, the cross-sections of the synchronous transmission section and the synchronous groove are both regular hexagons, and a dust exhaust valve is connected to the bottom of the filter cartridge.

[0014] As a preferred technical solution of the present invention, the radius of the first half-tooth gear is 8 to 12 times the radius of the first driven gear, and the radius of the second driven gear is 1.3 to 2 times the radius of the first driven gear.

[0015] As a preferred technical solution of the present invention, the other output shaft end of the double-headed motor is fixedly installed with a driving bevel gear, a main shaft is rotatably installed on the air guide cover, and a linkage bevel gear meshing with the driving bevel gear is installed on the main shaft, and a secondary shaft is installed on the air guide arc plate, and a transmission disk is fixedly installed on the tail end of the main shaft and both ends of the secondary shaft, and friction patterns are evenly distributed on the transmission disk, and side bevel gears are fixedly installed on the secondary shaft and the ventilation mesh cylinder, and a synchronous shaft is rotatably installed on the inner wall of the cage frame, and synchronous bevel gears are installed on the synchronous shaft, and the two side bevel gears are both connected to the synchronous bevel gear in transmission, and the two side bevel gears are respectively arranged on both sides of the synchronous bevel gear.

[0016] As a preferred technical solution of the present invention, the air guiding arc plate is of a semi-circular structure, the corresponding central angle of the air guiding arc plate is 180°, a set of air flow distribution holes are provided on both sides of the bottom of the cage frame, a splicing plate is provided at one end of the cage frame, a set of magnets are built in the splicing plate, and a splicing groove magnetically matched with the splicing plate is provided at the other end of the cage frame.

[0017] As a preferred technical solution of the present invention, a fumigation method for a grain depot circulation fumigation system includes the following steps:

[0018] SS01. Splicing of the floor cage units. According to the size of the grain depot, multiple floor cage units are quickly assembled into the required length through the magnetic splicing groove and the splicing plate, the air guiding cover is connected to the head end of the floor cage unit, the ventilation pipe is fixedly communicated with the top of the grain depot, and it is ensured that the pipeline connections of the pressure cylinder, the filter cylinder, the rotary valve assembly and the hot air blower are stable. Start the hot air blower and preheat it to the set temperature. Start the double-headed motor to drive the coaxial reverse rotation of the drive shaft, the ventilation mesh cylinder and the air guiding arc plate in the floor cage unit to form a dynamic turbulent flow field;

[0019] SS02. Circulation fumigation. According to the density of the grain pile in the grain depot and the fumigation requirements, adjust the reciprocating movement frequency of the moving valve cylinder through the reciprocating drive module. In the positive circulation mode, the moving valve cylinder slides to the upper extreme position, the valve hole is aligned with the upper support cylinder, the hot air blower air flow enters the air guiding cover through the lower support cylinder, and is evenly diffused to the bottom of the grain pile through the air distribution opening and the air flow distribution holes of the floor cage unit, and then returns to the filter cylinder through the ventilation pipe at the top of the grain depot, and finally returns to the hot air blower through the upper conduit. In the reverse circulation mode, the moving valve cylinder switches to the lower extreme position, the valve hole is aligned with the lower support cylinder, and the air guiding ring groove is aligned with the upper support cylinder. The hot air blower air flow enters the ventilation pipe through the upper support cylinder, penetrates the grain pile from top to bottom, is collected through the air flow distribution holes of the floor cage unit, and returns to the air guiding cover through the lower conduit, and finally returns to the hot air blower through the filter cylinder.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. Through the periodic switching function of the rotary valve assembly of the present invention, the hot air blower can alternately deliver air flow to the air guiding cover or the ventilation pipe to form a positive and negative closed-loop cycle. The reciprocating movement of the moving valve cylinder precisely controls the switching of the air inlet and return paths, so that the fumigation gas forms a multi-directional three-dimensional circulation in the grain depot, penetrates each layer of the grain pile and covers the edge area. Compared with the traditional single circulation path, the fumigation dead angle is effectively reduced, and the pest killing rate is effectively improved, thereby significantly ensuring the safety of grain storage.

[0022] 2. In the present invention, the ground cage unit adopts a modular magnetic adsorption splicing structure, which can be quickly expanded to adapt to different granary scales. The ventilation net cylinder and the air guiding arc plate are driven by a double-headed motor to rotate coaxially in opposite directions, forming a dynamic turbulent flow field. Combined with the guiding function of the 180° air guiding arc plate, the air flow uniformly diffuses from the air distribution opening to the air distribution holes at the bottom of the grain pile, realizing three-dimensional fumigation in both horizontal and vertical directions. Compared with the traditional fixed ground cage, the uniformity of air flow distribution is increased by 60%, and the fumigation efficiency is increased by 40%.

[0023] 3. In the present invention, the semi-circular valve column in the pressure cylinder adjusts the gas flow cross-sectional area by rotating the valve shaft, dynamically controls the gas pressure and flow rate, overcomes the resistance of the grain pile, and combines with the power output of the hot air blower to ensure that the gas maintains a stable flow rate in the complex circulation path, increasing the penetration depth by 50%, and the diffusion range of the fumigation gas covers the entire area of the granary. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of a granary circulation fumigation system of the present invention;

[0025] Figure 2 for the present invention Figure 1 is a schematic cross-sectional structural diagram;

[0026] Figure 3 for the present invention Figure 2 is a schematic diagram of a partially enlarged structure at A in the present invention;

[0027] Figure 4 for the present invention Figure 2 is a schematic diagram of a partially enlarged structure at B in the present invention;

[0028] Figure 5 for the present invention Figure 2 is a schematic diagram of a partially enlarged structure at C in the present invention;

[0029] Figure 6 is a schematic structural diagram of the dust removal shaft and the valve shaft of the present invention;

[0030] Figure 7 is a schematic structural diagram of the air guiding arc plate and the double-headed motor of the present invention;

[0031] Figure 8 is a schematic structural diagram of the spiral dust filter and the reduction gear set of the present invention;

[0032] Figure 9 for the present invention Figure 8 is a schematic diagram of a partially enlarged structure at D in the present invention.

[0033] In the figure: 1, hot air blower; 2, air guiding cover; 3, ventilation pipe; 4, pressurizing cylinder; 5, filter cartridge; 6, semi-circular valve column; 7, valve shaft; 8, spiral dust filter; 9, double-headed motor; 10, transmission shaft; 11, cage frame; 12, air distribution opening; 13, ventilation mesh cylinder; 14, air guiding arc plate; 15, fixed valve cylinder; 16, upper support cylinder; 17, electromagnetic air make-up valve; 18, lower support cylinder; 19, lower conduit; 20, moving valve cylinder; 21, valve hole; 22, air guiding ring groove; 23, upper conduit; 24, support; 25, reduction gear set; 26, reduction shaft; 27, reciprocating lead screw; 28, first half-tooth gear; 29, torsion spring; 30, first driven gear; 31, second driven gear; 32, dust shaking frame; 33, dust shaking shaft; 34, elastic resetting member; 35, upper tooth shaft; 36, lower tooth shaft; 37, second half-tooth gear; 38, vibrating tooth plate; 39, dust discharging valve; 40, main shaft; 41, auxiliary shaft; 42, transmission disc; 43, synchronizing shaft; 44, air flow distribution hole. Detailed implementation mode

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying 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 the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] As Figures 1 to 9 shown, the present invention provides a grain depot circulation fumigation system, including a hot air blower 1, an air guiding cover 2 and a ventilation pipe 3 fixedly connected to the grain depot;

[0036] It further includes a rotary valve assembly, and the rotary valve assembly periodically switches the hot air blower 1 to supply air to the air guiding cover 2 and return air through the ventilation pipe 3, and the hot air blower 1 to supply air to the ventilation pipe 3 and return air through the air guiding cover 2;

[0037] A pressurizing cylinder 4 and a filter cartridge 5 are respectively arranged on the ventilation pipe 3. The inner wall of the pressurizing cylinder 4 is rotatably connected with a semi-circular valve column 6. The bottom end of the semi-circular valve column 6 is provided with a rotatable valve shaft 7. A rotatable and reciprocatingly movable spiral dust filter 8 is arranged in the filter cartridge 5; A double-headed motor 9 is installed on the air guiding cover 2;

[0038] The rotary valve assembly includes a fixed valve cylinder 15. An upper support cylinder 16 is communicated between the fixed valve cylinder 15 and the air inlet port of the hot air blower 1. An electromagnetic air make-up valve 17 is communicated with the upper support cylinder 16, and the electromagnetic air make-up valve 17 is communicated with the fumigation drug supply device;

[0039] A lower support cylinder 18 is communicated between the fixed valve cylinder 15 and the air outlet port of the hot air blower 1. The tail end of the air guiding cover 2 is communicated with the fixed valve cylinder 15, and a lower conduit 19 is communicated between the fixed valve cylinder 15 and the air guiding cover 2;

[0040] The inner wall of the fixed valve barrel 15 is slidably installed with a moving valve barrel 20, the top of the moving valve barrel 20 is open and the bottom is closed;

[0041] A pair of valve holes 21 are opened at the bottom of the moving valve barrel 20 and are arranged upward with respect to the upper support cylinder 16 and the lower support cylinder 18. The axes of the valve holes 21, the upper support cylinder 16 and the lower support cylinder 18 are all perpendicular to the axis of the moving valve barrel 20;

[0042] The lower support cylinder 18 is coaxially arranged with the air guide cover 2;

[0043] A wind guide ring groove 22 is arranged on the moving valve barrel 20 at a position corresponding to the upper side of the valve hole 21. The inner wall of the moving valve barrel 20 is slidably communicated with an upper conduit 23, the other end of the upper conduit 23 is communicated with the filter cartridge 5, a support 24 is installed on the fixed valve barrel 15, and a reciprocating drive module for driving the valve barrel 20 to reciprocate along the axis of the fixed valve barrel 15 is arranged on the support 24;

[0044] Through the periodic switching function of the rotary valve assembly, the hot air blower 1 can alternately deliver air flow to the air guide cover 2 or the ventilation pipe 3 and form a closed-loop circuit, realizing the controllable reversal of the air flow circulation direction in the granary. During the working process, the reciprocating drive module drives the reduction gear set 25 through the double-headed motor 9, drives the moving valve barrel 20 to axially slide in the fixed valve barrel 15, so that the valve hole 21 is periodically aligned with the upper support cylinder 16 or the lower support cylinder 18, and the automatic switching of the air inlet and air return paths is completed. This solves the problems of single gas circulation path and inability to fumigate comprehensively and evenly in the existing granary circulation fumigation system. Compared with the traditional system, the present invention can make the fumigation gas form a more complex and reasonable circulation in the granary, make the gas contact the grain more fully, greatly improve the fumigation effect, ensure that all parts of the grain can be effectively fumigated, reduce pest residues, and ensure the safety of grain storage;

[0045] Through the setting of the rotary valve assembly, the fumigation air flow of the fumigation system can circulate from top to bottom into the grain material or from bottom to top into the grain material, thereby effectively improving the fumigation efficiency and fumigation uniformity of the grain material;

[0046] The electromagnetic air supply valve 17 is used to quantitatively feed fumigation medicinal gas into the air flow discharged from the hot air blower 1;

[0047] The reciprocating drive module includes a reduction gear set 25 installed at one output shaft end of the double-headed motor 9, a reduction shaft 26 rotatably connected to the support 24 and a reciprocating lead screw 27. The reduction shaft 26 is driven by the reduction gear set 25, a first half-tooth gear 28 is installed on the reduction shaft 26, a torsion spring 29 is arranged at the rotational connection of the reciprocating lead screw 27 and the support 24, the reciprocating lead screw 27 is in transmission connection with the moving valve barrel 20, a first driven gear 30 in transmission connection with the first half-tooth gear 28 is fixedly installed at the bottom end of the reciprocating lead screw 27, and a second driven gear 31 in transmission connection with the first half-tooth gear 28 is installed at the bottom of the valve shaft 7;

[0048] The radius of the first half gear 28 is 10 times the radius of the first driven gear 30, and the radius of the second driven gear 31 is 1.5 times the radius of the first driven gear 30.

[0049] In the rotary valve assembly, the fixed valve barrel 15, the movable valve barrel 20 and related components work together. The double-headed motor 9 drives the reduction gear set 25, driving the reduction shaft 26 to rotate, and then driving the first half gear 28 to rotate. The first half gear 28 meshes with the first driven gear 30 and the second driven gear 31, driving the reciprocating lead screw 27 to rotate, causing the movable valve barrel 20 to reciprocate along the axis of the fixed valve barrel 15. During the movement of the movable valve barrel 20, the communication state between the valve hole 21 and the upper support barrel 16 and the lower support barrel 18 changes, realizing the periodic switching of the air inlet and return paths of the hot air blower 1.

[0050] During the forward cycle, the movable valve barrel 20 slides to the upper extreme position, and the valve hole 21 is aligned with the upper support barrel 16. The air flow of the hot air blower 1 passes through the lower support barrel 18, the air guide cover 2, the floor cage unit, the granary, the ventilation pipe 3, the filter cartridge 5, the upper conduit 23, the movable valve barrel 20 and the valve hole 21 to achieve a forward cycle.

[0051] During the reverse cycle, the movable valve barrel 20 switches to the lower extreme position, the valve hole 21 is aligned with the lower support barrel 18, and the air guide ring groove 22 is aligned with the upper support barrel 16. The air flow of the hot air blower 1 passes through the valve hole 21, the movable valve barrel 20, the upper conduit 23, the filter cartridge 5, the granary, the floor cage unit, the lower conduit 19, and the air guide ring groove 22 to achieve a reverse cycle.

[0052] In the grain silo circulation fumigation system, the pressure cylinder 4 and the semi-circular valve column 6 play key roles. The pressure cylinder 4 is responsible for pressurizing the fumigation gas in the ventilation pipe 3. Since the gas will encounter resistance during pipeline transportation and diffusion in the grain silo, and the power will weaken, the pressure cylinder 4 can supplement the power, overcome the resistance, make the gas circulate smoothly in the whole system, improve the penetrability and diffusion range of the gas in the grain silo, avoid fumigation dead corners, ensure the quality of grain storage. The semi-circular valve column 6 is installed on the inner wall of the pressure cylinder 4 and is connected to the valve shaft 7. When the valve shaft 7 drives the semi-circular valve column 6 to rotate, the position of the semi-circular valve column 6 in the pressure cylinder 4 changes, thereby changing the gas flow cross-sectional area, blocking and squeezing the gas, and realizing the pressurization control of the gas. When the semi-circular valve column 6 blocks part of the gas passage, the gas pressure increases; rotating to change the flow cross-sectional area can also adjust the gas pressure and flow rate, making the pressurization process flexible and controllable, meeting different fumigation requirements, and optimizing the fumigation effect.

[0053] A transmission shaft 10 driven by the double-headed motor 9 is rotatably installed on the air guide cover 2, and the other end of the air guide cover 2 is connected to a modularly spliceable floor cage unit.

[0054] The floor cage unit includes a cage frame 11. One end of the cage frame 11 is provided with a splicing plate, and a group of magnets are built in the splicing plate. The other end of the cage frame 11 is provided with a splicing groove magnetically matched with the splicing plate.

[0055] The modular cage unit is quickly assembled through magnetic splicing grooves and splicing plates, and forms a dynamic spoiler field with the coaxial counter-rotation of the ventilation net tube 13 and the air guide arc plate 14. In the working process, the double-headed motor 9 drives the main shaft 40 and the secondary shaft 41 to rotate in opposite directions through synchronous bevel gear transmission, so that the airflow is evenly diffused from the air distribution opening 12 to the air distribution hole 44 at the bottom of the grain pile. This design breaks through the defects of the traditional cage structure being fixed and the airflow distribution being limited. Through the dynamic guidance of the 180° air guide arc plate 14, the granary can be fumigated in both horizontal and vertical directions, and the fumigation dead corners are reduced by 90%. The modular splicing design improves the scalability of the system and is suitable for granaries of different sizes.

[0056] A wind distribution opening 12 is provided at the top of the cage frame 11, a ventilation net tube 13 is rotatably installed on the inner wall of the cage frame 11, and a wind guide arc plate 14 is rotatably installed on the inner wall of the ventilation net tube 13. The wind guide arc plate 14 is a semicircular structure, and the central angle of the wind guide arc plate 14 is 180°. A group of air flow distribution holes 44 are provided on both sides of the bottom of the cage frame 11;

[0057] The ventilation net cylinder 13 and the air guide arc plate 14 are driven by a double-headed motor 9 and rotate coaxially and in opposite directions.

[0058] It also includes a dust vibrating frame 32 and a dust vibrating shaft 33 rotatably connected to the dust vibrating frame 32. A group of elastic reset members 34 are installed between the dust vibrating frame 32 and the bracket 24. The spiral dust filter 8 is fixedly installed on the dust vibrating shaft 33. The spiral dust filter 8 is evenly distributed with vertically arranged dust filter meshes. The axis of the dust filter mesh is parallel to the axis of the filter cartridge 5.

[0059] The dust-vibrating shaft 33 is driven by the reduction shaft 26, and an upper gear shaft 35 and a lower gear shaft 36 are rotatably mounted on the bracket 24, the upper gear shaft 35 is transmission-connected to the lower gear shaft 36 through a belt, a driven bevel gear is mounted on the lower gear shaft 36 and the reduction shaft 26, and the two driven bevel gears are meshed with each other, a second half-tooth gear 37 is mounted on the upper gear shaft 35, and a vibrating tooth plate 38 is mounted on the dust-vibrating frame 32, and the second half-tooth gear 37 is transmission-connected to the vibrating tooth plate 38.

[0060] A synchronous groove with an opening at the bottom is fixedly provided inside the dust-vibrating shaft 33, a synchronous transmission section slidably connected to the synchronous groove is fixedly provided on the reduction shaft 26, and the cross-sections of the synchronous transmission section and the synchronous groove are both regular hexagons. A dust exhaust valve 39 is connected to the bottom of the filter cartridge 5.

[0061] During system operation, the reduction shaft 26 rotates, driving the lower gear shaft 36 to rotate through the driven bevel gear. The lower gear shaft 36 then drives the upper gear shaft 35 to rotate via a belt. The second half-tooth gear 37 on the upper gear shaft 35 is in transmission connection with the vibrating tooth plate 38 on the dust vibrating frame 32, causing the dust vibrating frame 32 to vibrate up and down under the action of the elastic resetting member 34. At the same time, the reduction shaft 26 drives the dust vibrating shaft 33 to rotate through the synchronous transmission section, thereby driving the spiral dust filter 8 to rotate and reciprocate up and down. This design enables the spiral dust filter 8 to shake off the impurities attached to the dust filter mesh holes during the process of filtering impurities, avoiding clogging of the dust filter and maintaining a good filtering effect. This solves the problem that the existing dust filtering device is prone to clogging and affects the normal operation of the system. Compared with the traditional dust filtering structure, the dust vibrating structure of the present invention greatly improves the dust filtering efficiency and stability, reduces the manual cleaning frequency, ensures the continuous and stable operation of the grain bin circulating fumigation system, and reduces the maintenance cost;

[0062] Another output shaft end of the double-headed motor 9 is fixedly installed with a driving bevel gear. A main shaft 40 is rotatably installed on the air guide cover 2, and a linkage bevel gear meshing with the driving bevel gear is installed on the main shaft 40;

[0063] A secondary shaft 41 is installed on the air guide arc plate 14. Transmission discs 42 are fixedly installed at the tail end of the main shaft 40 and both ends of the secondary shaft 41, and friction patterns are evenly distributed on the transmission discs 42;

[0064] Side bevel gears are fixedly installed on both the secondary shaft 41 and the ventilation mesh cylinder 13. A synchronous shaft 43 is rotatably installed on the inner wall of the cage frame 11, and a synchronous bevel gear is installed on the synchronous shaft 43. Both side bevel gears are in transmission connection with the synchronous bevel gear, and the two side bevel gears are respectively arranged on both sides of the synchronous bevel gear.

[0065] The double-headed motor 9 drives the main shaft 40 and the secondary shaft 41 to rotate synchronously through the driving bevel gear and the linkage bevel gear. Combining the friction patterns of the transmission discs 42 and the meshing of the side bevel gears, precise reverse transmission of the ventilation mesh cylinder 13 and the air guide arc plate 14 is achieved. During the working process, after the air flow enters the floor bin unit through the air guide cover 2, through the transmission and distribution of the side bevel gear and the synchronous bevel gear, it is ensured that the rotational speeds of the air guide arc plate 14 and the ventilation mesh cylinder 13 are matched to form a stable eddy current. This design solves the problem of air flow disorder caused by transmission errors in the traditional system. Through the efficient cooperation of multiple-stage gears and bevel gears, the operating noise of the system is reduced, and the response speed of air flow regulation is increased, meeting the strict requirements for precision and stability in grain bin fumigation;

[0066] A fumigation method for a grain bin circulating fumigation system includes the following steps:

[0067] SS01. Splicing of the ground cage units. According to the size of the granary, multiple ground cage units 11 are quickly assembled into the required length through the magnetic attraction splicing grooves and splicing plates. Connect the air guide hood 2 to the head end of the ground cage unit, and fixedly connect the ventilation pipe 3 to the top of the granary. Ensure that the pipeline connections of the pressurizing cylinder 4, the filter cartridge 5, the rotary valve assembly and the hot air blower 1 are stable. Start the hot air blower 1 and preheat it to the set temperature. Then start the double-headed motor 9 to drive the transmission shaft 10 and the ventilation mesh cylinder 13 and the air guide arc plate 14 in the ground cage unit to rotate coaxially and in opposite directions, forming a dynamic turbulent flow field.

[0068] SS02. Circulating fumigation. According to the density of the grain pile in the granary and the fumigation requirements, adjust the reciprocating movement frequency of the movable valve cylinder 20 through the reciprocating drive module. In the positive circulation mode, the movable valve cylinder 20 slides to the upper extreme position, and the valve hole 21 is aligned with the upper support cylinder 16. The air flow of the hot air blower 1 enters the air guide hood 2 through the lower support cylinder 18, and is evenly diffused to the bottom of the grain pile through the air distribution openings 12 and the air flow distribution holes 44 of the ground cage unit, and then returns to the filter cartridge 5 through the ventilation pipe 3 at the top of the granary, and finally returns to the hot air blower 1 through the upper conduit 23. In the reverse circulation mode, the movable valve cylinder 20 switches to the lower extreme position, the valve hole 21 is aligned with the lower support cylinder 18, and the air guide ring groove 22 is aligned with the upper support cylinder 16. The air flow of the hot air blower 1 enters the ventilation pipe 3 through the upper support cylinder 16, penetrates the grain pile from top to bottom, is collected through the air flow distribution holes 44 of the ground cage unit, and then returns to the air guide hood 2 through the lower conduit 19, and finally returns to the hot air blower 1 through the filter cartridge 5.

[0069] Working principle and use process of the present invention: When the granary circulating fumigation system of the present invention is working, the rotary valve assembly plays a key role, the double-headed motor 9 drives the reduction gear set 25, drives the reduction shaft 26 to rotate, and then rotates the first half-tooth gear 28, the first half-tooth gear 28 is meshed with the first driven gear 30 and the second driven gear 31, drives the reciprocating screw rod 27 to rotate, and makes the movable valve cylinder 20 reciprocate along the axis of the fixed valve cylinder 15. During the positive cycle, the movable valve cylinder 20 slides to the upper limit position, the valve hole 21 is aligned with the upper support cylinder 16, and the hot air blower 1 airflow passes through the lower support cylinder 18, the air guide cover 2, the cage unit, the granary, the ventilation pipe 3, the filter cylinder 5, The upper conduit 23, the movable valve cylinder 20 and the valve hole 21 realize forward circulation. During reverse circulation, the movable valve cylinder 20 switches to the lower limit position, the valve hole 21 is aligned with the lower branch cylinder 18, and the air guide ring groove 22 is aligned with the upper branch cylinder 16. The airflow of the hot air blower 1 is reversely circulated through the valve hole 21, the movable valve cylinder 20, the upper conduit 23, the filter cylinder 5, the granary, the ground cage unit, the lower conduit 19, and the air guide ring groove 22. In this way, the periodic switching of the air inlet and return paths of the hot air blower 1 is realized, so that the fumigation gas forms a complex and reasonable circulation in the granary. At the same time, the electromagnetic air supply valve 17 quantitatively delivers fumigation gas into the outlet airflow of the hot air blower 1. During the gas circulation process, The pressurizing cylinder 4 and the semicircular valve column 6 pressurize the fumigation gas in the ventilation pipe 3, and the valve shaft 7 drives the semicircular valve column 6 to rotate, changing the gas flow cross-sectional area, realizing the pressurization regulation of the gas, ensuring the smooth circulation of the gas in the system, and improving the penetration and diffusion range of the gas in the granary. As for the ground cage unit, the double-headed motor 9 drives the main shaft 40 and the secondary shaft 41 to be linked, and the ventilation net cylinder 13 and the air guide arc plate 14 are rotated in opposite directions through the synchronous bevel gear transmission. The airflow enters from the air distribution opening 12, is guided by the 180° air guide arc plate 14, and is evenly diffused to the airflow distribution hole 44 at the bottom of the grain pile, forming a dynamic turbulence field, realizing the horizontal and vertical bidirectional of the granary. Three-dimensional fumigation, and the cage unit can be quickly assembled through the magnetic splicing groove and the splicing plate, with strong expansibility. In the dust filtering part, the reduction shaft 26 rotates, and the lower gear shaft 36 is driven to rotate through the driven bevel gear. The lower gear shaft 36 drives the upper gear shaft 35 to rotate through the belt. The second half-tooth gear 37 on the upper gear shaft 35 is connected with the vibrating tooth plate 38 on the dust vibration frame 32, so that the dust vibration frame 32 vibrates up and down under the action of the elastic reset member 34. At the same time, the reduction shaft 26 drives the dust vibration shaft 33 to rotate through the synchronous transmission section, driving the spiral dust filter 8 to rotate and reciprocate up and down, shaking off impurities on the dust filter mesh, avoiding clogging of the dust filter, and maintaining a good filtering effect.

[0070] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0071] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A grain silo circulating fumigation system, comprising a hot air blower (1), a wind guide cover (2) and a ventilation pipe (3) fixedly communicated with the grain silo, characterized in that: It further includes a rotary valve assembly. The rotary valve assembly periodically switches the hot air blower (1) to supply air to the air guiding cover (2) and return air through the ventilation pipe (3), and the hot air blower (1) to supply air to the ventilation pipe (3) and return air through the air guiding cover (2). A pressurizing cylinder (4) and a filter cartridge (5) are respectively arranged on the ventilation pipe (3). The inner wall of the pressurizing cylinder (4) is rotatably connected with a semi-circular valve post (6). The bottom end of the semi-circular valve post (6) is provided with a rotatable valve shaft (7). A spiral dust filter sheet (8) that can rotate and reciprocate up and down is arranged in the filter cartridge (5). A double-headed motor (9) is installed on the air guiding cover (2). A transmission shaft (10) driven by the double-headed motor (9) is rotatably installed on the air guiding cover (2). The other end of the air guiding cover (2) is communicated with a modularly spliceable ground cage unit; The ground cage unit includes a cage frame (11). A cloth air opening (12) is opened at the exact top of the cage frame (11). A ventilation net cylinder (13) is rotatably installed on the inner wall of the cage frame (11). A wind guiding arc plate (14) is rotatably installed on the inner wall of the ventilation net cylinder (13). The ventilation net cylinder (13) and the wind guiding arc plate (14) are driven by the double-headed motor (9) and rotate coaxially in opposite directions.

2. The grain silo recirculating fumigation system according to claim 1, wherein: The rotary valve assembly includes a fixed valve cylinder (15). An upper support cylinder (16) is communicated between the fixed valve cylinder (15) and the air inlet port of the hot air blower (1). An electromagnetic air supplement valve (17) is communicated with the upper support cylinder (16). The electromagnetic air supplement valve (17) is communicated with the fumigation medicine supply device. A lower support cylinder (18) is communicated between the fixed valve cylinder (15) and the air outlet port of the hot air blower (1). The tail end of the air guiding cover (2) is communicated with the fixed valve cylinder (15). A lower conduit (19) is communicated between the fixed valve cylinder (15) and the air guiding cover (2). A movable valve cylinder (20) is slidably installed on the inner wall of the fixed valve cylinder (15). A pair of valve holes (21) arranged towards the upper support cylinder (16) and the lower support cylinder (18) are opened at the bottom of the movable valve cylinder (20). A wind guiding ring groove (22) is arranged on the movable valve cylinder (20) at a position corresponding to the upper part of the valve holes (21). An upper conduit (23) is slidably communicated with the inner wall of the movable valve cylinder (20). The other end of the upper conduit (23) is communicated with the filter cartridge (5). A support (24) is installed on the fixed valve cylinder (15). A reciprocating drive module for driving the valve cylinder (20) to reciprocate along the axis of the fixed valve cylinder (15) is arranged on the support (24).

3. The grain silo recirculation fumigation system according to claim 2, wherein: The top end of the movable valve cylinder (20) is open and the bottom end is closed. The axes of the valve holes (21), the upper support cylinder (16) and the lower support cylinder (18) are all perpendicular to the axis of the movable valve cylinder (20). The lower support cylinder (18) is coaxially arranged with the air guiding cover (2).

4. The grain silo recirculating fumigation system according to claim 1, wherein: The reciprocating drive module includes a reduction gear set (25) installed at one output shaft end of a double-headed motor (9), a reduction shaft (26) rotatably connected to a bracket (24), and a reciprocating lead screw (27). The reduction shaft (26) is driven by the reduction gear set (25). A first half-tooth gear (28) is installed on the reduction shaft (26). A torsion spring (29) is provided at the rotational connection of the reciprocating lead screw (27) and the bracket (24). The reciprocating lead screw (27) is in transmission connection with the moving valve barrel (20). A first driven gear (30) in transmission connection with the first half-tooth gear (28) is fixedly installed at the bottom end of the reciprocating lead screw (27). A second driven gear (31) in transmission connection with the first half-tooth gear (28) is installed at the bottom of the valve shaft (7).

5. The grain silo recirculating fumigation system according to claim 4, characterized in that: It further includes a dust-removing frame (32) and a dust-removing shaft (33) rotatably connected to the dust-removing frame (32). A set of elastic resetting members (34) are installed between the dust-removing frame (32) and the bracket (24). The spiral dust filter (8) is fixedly installed on the dust-removing shaft (33). The dust-removing shaft (33) is driven by the reduction shaft (26). An upper tooth shaft (35) and a lower tooth shaft (36) are respectively rotatably installed on the bracket (24). The upper tooth shaft (35) is in transmission connection with the lower tooth shaft (36) through a belt. A driven bevel gear is installed on both the lower tooth shaft (36) and the reduction shaft (26), and the two driven bevel gears mesh with each other. A second half-tooth gear (37) is installed on the upper tooth shaft (35). A vibration tooth plate (38) is installed on the dust-removing frame (32). The second half-tooth gear (37) is in transmission connection with the vibration tooth plate (38).

6. The grain silo recirculation fumigation system according to claim 5, characterized in that: Vertically arranged dust filter holes are evenly distributed on the spiral dust filter (8). The axis of the dust filter holes is parallel to the axis of the filter cylinder (5). A synchronizing groove with an open bottom end is fixedly formed inside the dust-removing shaft (33). A synchronizing transmission section slidably connected to the synchronizing groove is fixedly provided on the reduction shaft (26). The cross-sections of the synchronizing transmission section and the synchronizing groove are both regular hexagons. A dust discharge valve (39) is communicated with the bottom of the filter cylinder (5).

7. A grain silo circulating fumigation system according to claim 6, characterized in that: The radius of the first half-tooth gear (28) is 8 to 12 times the radius of the first driven gear (30). The radius of the second driven gear (31) is 1.3 to 2 times the radius of the first driven gear (30).

8. A grain bin circulating fumigation system according to claim 1, characterized in that: Another output shaft end of the double-headed motor (9) is fixedly installed with a driving bevel gear. A main shaft (40) is rotatably installed on the air guide cover (2). A linkage bevel gear meshing with the driving bevel gear is installed on the main shaft (40). A secondary shaft (41) is installed on the air guide arc plate (14). Driving disks (42) are fixedly installed at the tail end of the main shaft (40) and both ends of the secondary shaft (41). Friction lines are evenly distributed on the driving disks (42). Side bevel gears are fixedly installed on both the secondary shaft (41) and the ventilation net cylinder (13). A synchronous shaft (43) is rotatably installed on the inner wall of the cage frame (11). A synchronous bevel gear is installed on the synchronous shaft (43). Both of the two side bevel gears are in transmission connection with the synchronous bevel gear. The two side bevel gears are respectively arranged on both sides of the synchronous bevel gear.

9. The grain depot circulation fumigation system according to claim 1, characterized in that: The air guide arc plate (14) is of a semi-circular structure. The central angle corresponding to the air guide arc plate (14) is 180°. A set of air flow distribution holes (44) are respectively opened on both sides of the bottom of the cage frame (11). One end of the cage frame (11) is provided with a splicing plate. A set of magnets are built in the splicing plate. A splicing groove magnetically matched with the splicing plate is arranged at the other end of the cage frame (11).

10. A fumigation method for a grain silo circulation fumigation system according to any one of claims 1-9, characterized in that, It includes the following steps: SS01. Splicing of the ground cage units. According to the size of the grain bin, multiple ground cage units (11) are quickly assembled into the required length through the magnetic attraction splicing groove and the splicing plate. The air guide cover (2) is connected to the head end of the ground cage unit. The ventilation pipe (3) is fixedly communicated with the top of the grain bin. And it is ensured that the pipeline connections of the pressure cylinder (4), the filter cylinder (5), the rotary valve assembly and the hot air blower (1) are firm. Start the hot air blower (1) and preheat to the set temperature. Start the double-headed motor (9) to drive the coaxial reverse rotation of the drive shaft (10), the ventilation net cylinder (13) and the air guide arc plate (14) in the ground cage unit to form a dynamic turbulent flow field. SS02. Circulation fumigation. According to the grain pile density and fumigation requirements in the grain bin, adjust the reciprocating movement frequency of the moving valve cylinder (20) through the reciprocating drive module. In the positive circulation mode, the moving valve cylinder (20) slides to the upper extreme position, and the valve hole (21) is aligned with the upper support cylinder (16). The air flow of the hot air blower (1) enters the air guide cover (2) through the lower support cylinder (18), and is evenly diffused to the bottom of the grain pile through the air distribution opening (12) and the air flow distribution holes (44) of the ground cage unit, and then returns to the filter cylinder (5) through the ventilation pipe (3) at the top of the grain bin, and finally returns to the hot air blower (1) through the upper conduit (23). In the reverse circulation mode, the moving valve cylinder (20) is switched to the lower extreme position, the valve hole (21) is aligned with the lower support cylinder (18), and the air guide ring groove (22) is aligned with the upper support cylinder (16). The air flow of the hot air blower (1) enters the ventilation pipe (3) through the upper support cylinder (16), penetrates the grain pile from top to bottom, is collected through the air flow distribution holes (44) of the ground cage unit, and then returns to the air guide cover (2) through the lower conduit (19), and finally returns to the hot air blower (1) through the filter cylinder (5).

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