Ventilation system for centralized granary

Abstract

The invention discloses a ventilation system for a centralized grain storage granary, the centralized grain storage granary comprises a plurality of grain storage units, the bottoms of the grain storage units are provided with square cones, and the grain storage units are communicated with one another; the ventilation system comprises ventilation ring pipes arranged below the grain storage units, U-shaped ventilation pipes arranged on the conical surfaces of the square cones and at the intersections of the adjacent conical surfaces, and ventilation cages arranged at the intersections of the granary walls and the conical surfaces, the U-shaped ventilation pipes are communicated with the ventilation ring pipes, part of the U-shaped ventilation pipes are communicated with the ventilation cages, and the ventilation cages between the adjacent granary walls are communicated. Air outlet holes for ventilating the grain storage units are formed in the surfaces of the U-shaped ventilation pipes and the surfaces of the ventilation cages, a fan, a refrigerating device and a ventilation mother pipe which are communicated in sequence are arranged below the centralized grain storage barn, and the ventilation mother pipe is communicated with all the ventilation ring pipes in the barn. The ventilation cages are communicated to form the annular ventilation duct surrounding the whole grain storage bin, so that the refrigeration and ventilation effects in the grain storage bin are enhanced; and all the grain storage units share one fan, so that the ventilation cost of the centralized grain storage barn is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of grain storage, and in particular to a ventilation system for a centralized grain storage bin. Background Art

[0002] In order to maintain the good quality of grain stored in the granary, a ventilation system is usually required in the granary to control the temperature and humidity in the grain pile, thereby preventing mold growth, pest breeding, and grain heating. For example, Chinese patent CN106688475A discloses a circular ventilation system for grain storage. In recent years, various regions have strengthened the construction of grain depots. In order to solve the problem of limited space and improve the quality of stored grain, the design of warehouse types and process systems tends to be centralized and modernized, and centralized grain storage warehouses have emerged. A centralized grain storage silo usually consists of 2 or 4 grain storage units, and the bottom of each grain storage unit is a square cone. If the ventilation system disclosed in Chinese patent CN106688475A is applied to the centralized grain storage silo, a fan needs to be configured in each grain storage hopper, which increases the ventilation cost of the centralized grain storage silo. In addition, ventilation holes are only provided on the cone surface, resulting in dead corners for air flow, poor ventilation effect, and failure to utilize heat dissipation of grain. In addition, the grain stacking height of the centralized grain storage silo is usually about 20 meters. The strength of the ventilation pipe in the existing grain storage hopper is usually unable to withstand the ultra-high grain stacking height, resulting in structural instability of the ventilation system.

[0003] Based on the above reasons, based on the high centralization of the ventilation system of centralized grain storage silos, it is urgent to develop a new ventilation system for centralized grain storage silos. Summary of the invention

[0004] In view of the defects existing in the prior art, the present application provides a ventilation system for a centralized grain storage silo to solve the technical problems of the ventilation system of the centralized grain storage silo in the prior art, such as high ventilation cost, poor ventilation effect and unstable structure.

[0005] In order to achieve the purpose of the above invention, the technical solution provided by the present invention is as follows:

[0006] A ventilation system for a centralized grain storage bin, the centralized grain storage bin comprising a plurality of grain storage units, the plurality of grain storage units being arranged in double rows, a square cone being arranged at the bottom of the grain storage unit, the square cone comprising four conical surfaces, the bottom of the square cone being a grain outlet, the grain storage units being communicated with each other, the conical surfaces of adjacent square cones intersecting, the centralized grain storage bin further comprising a bin wall arranged around the centralized grain storage bin and a bin bottom arranged around the bottom of the centralized grain storage bin, the bin wall being arranged vertically, the bin bottom being arranged horizontally, the bin wall and the bin bottom intersecting vertically, the bin wall intersecting with the conical surfaces outside the grain storage unit, the bin bottom intersecting with all the conical surfaces, and the conical surfaces between adjacent grain storage units intersecting;

[0007] The ventilation system comprises a ventilation ring pipe arranged below the grain storage unit, a U-shaped ventilation pipe arranged on the conical surface and at the intersection of adjacent conical surfaces, and a ventilation cage arranged at the intersection of the silo wall and the conical surface, both sides of the U-shaped ventilation pipe are fixed on the conical surface, the lower end of the U-shaped ventilation pipe faces the grain outlet, the upper end of the U-shaped ventilation pipe faces the silo wall, the U-shaped ventilation pipe is communicated with the ventilation ring pipe, part of the U-shaped ventilation pipe is communicated with the ventilation cage, the ventilation cages between adjacent silo walls are communicated, and the surfaces of the U-shaped ventilation pipe and the ventilation cage are both provided with air outlets for ventilation to the grain storage unit;

[0008] A fan, a refrigeration device and a main ventilation pipe which are connected in sequence are arranged below the centralized grain storage bin, and the main ventilation pipe is connected with all the ventilation ring pipes in the bin.

[0009] In one embodiment, the refrigeration device is an evaporator, and the inlet and outlet of the refrigeration device are respectively provided with reducers connected to the fan and the ventilation main pipe, and the large-diameter ends of the reducers are both arranged at the end of the refrigeration device.

[0010] In one embodiment, the air outlet holes on the surface of the U-shaped ventilation duct and the ventilation cage are both fish-scale punching holes opening downward.

[0011] In one embodiment, a plurality of first reinforcement members are arranged at intervals on the inner wall of the U-shaped ventilation duct along the axial direction of the U-shaped ventilation duct, wherein the first reinforcement member is a U-shaped metal plate, the upper side of the first reinforcement member is fixedly connected to the inner wall of the U-shaped ventilation duct, and the left and right sides of the first reinforcement member are fixed on the conical surface.

[0012] In one embodiment, concrete is backfilled between the silo wall, silo bottom and the conical surface, concrete is backfilled between the silo bottom and the adjacent conical surface, the concrete below the conical surface is provided with an embedded steel plate for fixing the U-shaped ventilation duct or ventilation cage, the silo wall is provided with an embedded steel plate for fixing the ventilation cage, the U-shaped ventilation duct and the ventilation cage are both made of metal, both sides of the U-shaped ventilation duct are welded to the embedded steel plate below the conical surface, the lower side of the ventilation cage is welded to the embedded steel plate below the conical surface, and the upper side of the ventilation cage is welded to the embedded steel plate of the silo wall.

[0013] In one embodiment, the ventilation cage includes an upper plate and a lower plate, the lower plate is parallel to the warehouse wall, the lower end of the lower plate is welded to the embedded steel plate below the cone surface, the upper end of the lower plate is fixedly connected to the lower end of the upper plate, the upper end of the upper plate is welded to the embedded steel plate of the warehouse wall, and the angle between the upper plate and the lower plate is an obtuse angle.

[0014] In one embodiment, a transverse reinforcement is welded at the connection between the lower plate and the upper plate, and a second reinforcement is welded at intervals on the outer surface of the ventilation cage. The second reinforcement is a steel plate whose shape matches that of the ventilation cage, and the transverse reinforcement is welded to the second reinforcement.

[0015] In one embodiment, the U-shaped ventilation pipe arranged on the conical surface is communicated with the ventilation cage, and the U-shaped ventilation pipe arranged on the conical surface is arranged on the center line of the conical surface, and the U-shaped ventilation pipe on the conical surface is communicated with the ventilation cage through a plug pipe fitting, and the lower end of the plug pipe fitting is welded to the upper end of the U-shaped ventilation pipe, and the upper end of the plug pipe fitting is welded to the ventilation cage, and the cross-section of the plug pipe fitting is U-shaped which is the same as the cross-section of the U-shaped ventilation pipe, and the upper end of the plug pipe fitting matches the outer surface of the ventilation cage, and the outer surface of the plug pipe fitting and the outer surface of the U-shaped ventilation pipe form a smooth curved surface.

[0016] In one embodiment, the U-shaped ventilation duct arranged at the intersection of adjacent conical surfaces is a U-shaped ventilation duct that is not connected to the ventilation cage, and a conical ventilation body is fixed to the upper end of the U-shaped ventilation duct that is not connected to the ventilation cage, and the lower end of the conical ventilation body is a U-shape with the same cross-section as the U-shaped ventilation duct, and two side edges of the conical ventilation body are respectively fixed on adjacent conical surfaces, and the top of the conical ventilation body is fixed at the intersection of adjacent conical surfaces, and the outer surface of the conical ventilation body forms a smooth curved surface with the outer surface of the U-shaped ventilation duct.

[0017] Compared with the prior art, this application has at least the following beneficial effects:

[0018] The ventilation system for centralized grain storage silos in the present invention not only has a U-shaped ventilation duct on the conical surface of the square cone, but also has a communicating ventilation cage at the intersection of the silo wall and the conical surface. The ventilation cages between all the silo walls in the grain storage silo are connected to form a ring-shaped ventilation duct surrounding the entire grain storage silo, thereby increasing the ventilation area of ​​the grain storage silo and enhancing the refrigeration and ventilation effects in the grain storage silo. All grain storage units in the centralized grain storage silo in the present invention share one fan, thereby reducing the ventilation cost of the centralized grain storage silo. The present application has a first reinforcement on the U-shaped ventilation duct, and a second reinforcement and a transverse reinforcement on the ventilation cage, thereby improving the structural strength of the U-shaped ventilation duct and the ventilation cage, improving the bearing capacity of the ventilation structure in the silo, and ensuring the safety of the ventilation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a ventilation system for a centralized grain storage bin in an embodiment of the present application;

[0020] Figure 2 yes Figure 1 Middle AA section view;

[0021] Figure 3 It is a three-dimensional schematic diagram of a grain storage hopper in an embodiment of the present application;

[0022] Figure 4 It is a schematic diagram of the structure of some ventilation cages in the embodiments of the present application.

[0023] Figure numerals: 1. air inlet; 2. fan; 3. reducer; 4. refrigeration device; 5. ventilation main pipe; 6. ventilation ring pipe; 7. ventilation cage; 701. upper plate; 702. lower plate; 703. transverse reinforcement, 704. second reinforcement; 8. plug fitting; 9. first reinforcement; 10. U-shaped ventilation duct; 11. conical ventilation body; 12. grain storage unit; 13. concrete, 14. cone surface; 15. silo wall; 16. silo bottom; 17. grain outlet; 18. embedded steel plate. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0025] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. The singular forms of "a", "said" and "the" used in this disclosure and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0026] It should be understood that although the terms first, second, third, etc. may be used in the present disclosure to describe various information, such information should not be limited to these terms and should not be understood as indicating or implying relative importance. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0027] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0028] In order to better understand the technical solution of the present invention, the present invention is described in detail below with reference to the accompanying drawings.

[0029] like Figures 1 to 3As shown, this embodiment is a ventilation system for a centralized grain storage warehouse, the centralized grain storage warehouse includes a plurality of grain storage units 12, and the plurality of grain storage units 12 are arranged in double rows, a square cone is provided at the bottom of the grain storage unit 12, the square cone includes four conical surfaces 14, the bottom of the square cone is a grain outlet 17, the grain storage units 12 are connected, and the conical surfaces of adjacent square cones intersect, the centralized grain storage warehouse also includes a warehouse wall 15 arranged around the centralized grain storage warehouse and a warehouse bottom 16 arranged around the bottom of the centralized grain storage warehouse, the warehouse wall 15 is vertically arranged, the warehouse bottom 16 is horizontally arranged, the warehouse wall 15 and the warehouse bottom 16 intersect vertically, the warehouse wall 15 intersects with the conical surface on the outside of the grain storage unit 12, the warehouse bottom intersects with all the conical surfaces, and the conical surfaces between adjacent grain storage units 12 intersect.

[0030] The ventilation system includes a ventilation ring pipe 6 arranged below the grain storage unit 12, a U-shaped ventilation pipe 10 arranged on the conical surface 14 and at the intersection of adjacent conical surfaces 14, and a ventilation cage 7 arranged at the intersection of the warehouse wall 15 and the conical surface. Both sides of the U-shaped ventilation pipe 10 are fixed on the conical surface 14, the lower end of the U-shaped ventilation pipe 10 faces the grain outlet 17, the upper end of the U-shaped ventilation pipe 10 faces the warehouse wall 15, the U-shaped ventilation pipe 10 is communicated with the ventilation ring pipe 6, part of the U-shaped ventilation pipe 10 is communicated with the ventilation cage 7, the ventilation cage 7 between adjacent warehouse walls 15 is communicated, and the surfaces of the U-shaped ventilation pipe 10 and the ventilation cage 7 are provided with air outlet holes for ventilating the grain storage unit 12.

[0031] A fan 2, a refrigeration device 4 and a ventilation main pipe 5 are arranged below the centralized grain storage bin, which are connected in sequence. The ventilation main pipe 5 is connected to all ventilation ring pipes 6 in the bin. Air enters the fan through the air inlet 1 to form mechanical wind, and enters the ventilation main pipe 5 after being cooled by the refrigeration device 4, and then enters the grain storage unit 12 through the ventilation main pipe 5. In this embodiment, the refrigeration device 4 is an evaporator. In order to improve the cooling efficiency of the refrigeration device, the inlet and outlet of the refrigeration device 4 are respectively provided with reducers 3, which are respectively connected to the fan 2 and the ventilation main pipe 5. The large-diameter ends of the reducers 3 are all arranged at the end of the refrigeration device 4. The air entering the air inlet 1 can come from outside the bin or from inside the bin.

[0032] In order to improve the structural strength of the entire centralized grain storage silo, concrete 13 is backfilled between the silo wall 15, the silo bottom 16 and the conical surface 14, and concrete 13 is backfilled between the silo bottom 16 and the adjacent conical surface 14. The concrete below the conical surface 14 is provided with a pre-buried steel plate 18 for fixing the U-shaped ventilation pipe 10 or the ventilation cage 7. The silo wall 15 is provided with a pre-buried steel plate 18 for fixing the ventilation cage 7. The U-shaped ventilation pipe 10 and the ventilation cage 7 are both made of metal. The two sides of the U-shaped ventilation pipe 10 are welded to the pre-buried steel plate below the conical surface 14, the lower side of the ventilation cage 7 is welded to the pre-buried steel plate below the conical surface 14, and the upper side of the ventilation cage 7 is welded to the pre-buried steel plate of the silo wall 15. The U-shaped ventilation pipe 10 and the ventilation cage 7 are both welded to the pre-buried steel plate, which avoids the presence of gaps between the ventilation components and the surface, resulting in accumulation of materials or grain falling into the ventilation components to cause blockage.

[0033] A plurality of first reinforcement members 9 are arranged at intervals on the inner wall of the U-shaped ventilation duct 10 along the axial direction of the U-shaped ventilation duct 10. The first reinforcement member 9 is a U-shaped metal plate. The upper side of the first reinforcement member 9 is fixedly connected to the inner wall of the U-shaped ventilation duct 10, and the left and right sides of the first reinforcement member 9 are fixed on the conical surface 14. The first reinforcement member 9 is arranged in the U-shaped ventilation duct 10 to improve the structural strength of the ventilation duct. In this embodiment, the material of the U-shaped ventilation duct 10 is a 2 mm thick galvanized steel plate, and the material of the first reinforcement member 9 is a 50 mm wide and 4 mm thick galvanized steel plate.

[0034] In this embodiment, the air outlet holes on the surface of the U-shaped ventilation pipe 10 and the ventilation cage 7 are fish-scale punching holes with openings arranged downward to prevent rice from entering the air outlet holes and causing blockage during ventilation.

[0035] like Figure 4 As shown, the ventilation cage 7 includes an upper plate 701 and a lower plate 702, the lower plate 702 is parallel to the warehouse wall 15, the lower end of the lower plate 702 is welded to the embedded steel plate below the cone 14, the upper end of the lower plate 702 is fixedly connected to the lower end of the upper plate 701, the upper end of the upper plate 701 is welded to the embedded steel plate of the warehouse wall 15, and the angle between the upper plate 701 and the lower plate 702 is an obtuse angle, so that a downward slope is formed between the upper plate 701 and the warehouse wall 15, so that the grain can flow smoothly when passing through the ventilation cage 7, avoiding the accumulation of grain and mold.

[0036] A transverse reinforcement 703 is welded at the connection between the lower plate 702 and the upper plate 701, and a second reinforcement 704 is welded at intervals on the outer surface of the ventilation cage 7. The second reinforcement 704 is a steel plate whose shape matches the shape of the ventilation cage 7. The transverse reinforcement 703 is welded to the second reinforcement. Providing the transverse reinforcement 703 and the second reinforcement 704 on the ventilation cage 7 can improve the structural strength of the ventilation cage 7.

[0037] like Figure 2As shown, the U-shaped ventilation pipe 10 arranged on the conical surface 14 is communicated with the ventilation cage 7, and the U-shaped ventilation pipe arranged on the conical surface 14 is arranged on the center line of the conical surface 14. The U-shaped ventilation pipe 10 on the conical surface 14 is communicated with the ventilation cage 7 through a plug pipe fitting 8. The lower end of the plug pipe fitting 8 is welded to the upper end of the U-shaped ventilation pipe 10, and the upper end of the plug pipe fitting 8 is welded to the ventilation cage 7. The cross-section of the plug pipe fitting 8 is U-shaped, which is the same as the cross-section of the U-shaped ventilation pipe 10. The upper end of the plug pipe fitting 8 matches the outer surface of the ventilation cage 7. The outer surface of the plug pipe fitting 8 and the outer surface of the U-shaped ventilation pipe 10 form a smooth curved surface, which can also prevent grain accumulation and mold.

[0038] The U-shaped ventilation duct 10 at the intersection of adjacent conical surfaces 14 is a U-shaped ventilation duct 10 that is not connected to the ventilation cage 7. A conical ventilation body 11 is fixed to the upper end of the U-shaped ventilation duct 10 that is not connected to the ventilation cage 7. The lower end of the conical ventilation body 11 is a U-shape with the same cross-section as the U-shaped ventilation duct 10. Two side edges of the conical ventilation body 11 are respectively fixed on adjacent conical surfaces 14. The top of the conical ventilation body 11 is fixed at the intersection of adjacent conical surfaces 14. The outer surface of the conical ventilation body 11 and the outer surface of the U-shaped ventilation duct 10 form a smooth curved surface, which can also prevent grain accumulation and mold.

[0039] The working principle of the ventilation system for centralized grain storage silos in this application is as follows:

[0040] Air passes through the fan 2 to form mechanical wind. After being cooled by the refrigeration device 3, the mechanical wind enters the ventilation ring pipe 6 in each grain storage unit 12 through the ventilation main pipe 5. The mechanical wind enters each U-shaped ventilation pipe 10 through the ventilation ring pipe 6 and enters the ventilation cage 7 through the U-shaped ventilation pipe 10. The ventilation cages 7 between all the warehouse walls 15 in the grain storage warehouse are connected to form a circular ventilation duct surrounding the entire grain storage warehouse. The mechanical wind is ventilated into the warehouse through the U-shaped ventilation pipe 10 and the air outlet of the ventilation cage 7, especially the ventilation of the ventilation cage 7, which increases the ventilation area of ​​the grain storage warehouse and enhances the refrigeration and ventilation effects in the grain storage warehouse.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A ventilation system for a centralized grain storage silo, characterized in that: The centralized grain storage warehouse comprises a plurality of grain storage units, and the plurality of grain storage units are arranged in double rows. A square cone is arranged at the bottom of the grain storage unit, and the square cone comprises four conical surfaces. The bottom of the square cone is a grain outlet. The grain storage units are connected, and the conical surfaces of adjacent square cones intersect. The centralized grain storage warehouse also comprises a warehouse wall arranged around the centralized grain storage warehouse and a warehouse bottom arranged around the bottom of the centralized grain storage warehouse. The warehouse wall is arranged vertically, and the warehouse bottom is arranged horizontally. The warehouse wall and the warehouse bottom intersect vertically. The warehouse wall intersects with the conical surface outside the grain storage unit, and the warehouse bottom intersects with all the conical surfaces. The conical surfaces between adjacent grain storage units intersect; The ventilation system comprises a ventilation ring pipe arranged below the grain storage unit, a U-shaped ventilation pipe arranged on the conical surface and at the intersection of adjacent conical surfaces, and a ventilation cage arranged at the intersection of the silo wall and the conical surface, both sides of the U-shaped ventilation pipe are fixed on the conical surface, the lower end of the U-shaped ventilation pipe faces the grain outlet, the upper end of the U-shaped ventilation pipe faces the silo wall, the U-shaped ventilation pipe is communicated with the ventilation ring pipe, part of the U-shaped ventilation pipe is communicated with the ventilation cage, the ventilation cages between adjacent silo walls are communicated, and the surfaces of the U-shaped ventilation pipe and the ventilation cage are both provided with air outlets for ventilation to the grain storage unit; A fan, a refrigeration device and a main ventilation pipe which are connected in sequence are arranged below the centralized grain storage bin, and the main ventilation pipe is connected with all the ventilation ring pipes in the bin.

2. The ventilation system for a centralized grain storage bin according to claim 1, characterized in that: The refrigeration device is an evaporator, and the inlet and outlet of the refrigeration device are respectively provided with reducers connected to the fan and the ventilation main pipe respectively, and the large-diameter ends of the reducers are all arranged at the end of the refrigeration device.

3. The ventilation system for a centralized grain storage silo according to claim 1, characterized in that: The air outlet holes on the surface of the U-shaped ventilation pipe and the ventilation cage are all fish scale punching holes opening downward.

4. The ventilation system for a centralized grain storage bin according to claim 1, characterized in that: A plurality of first reinforcement members are arranged at intervals on the inner wall of the U-shaped ventilation duct along the axial direction of the U-shaped ventilation duct. The first reinforcement member is a U-shaped metal plate. The upper side of the first reinforcement member is fixedly connected to the inner wall of the U-shaped ventilation duct, and the left and right sides of the first reinforcement member are fixed on the conical surface.

5. The ventilation system for a centralized grain storage bin according to claim 1, characterized in that: Concrete is backfilled between the warehouse wall, warehouse bottom and the conical surface, and concrete is backfilled between the warehouse bottom and the adjacent conical surface. The concrete below the conical surface is provided with an embedded steel plate for fixing the U-shaped ventilation duct or ventilation cage, and the warehouse wall is provided with an embedded steel plate for fixing the ventilation cage. The U-shaped ventilation duct and the ventilation cage are both made of metal. Both sides of the U-shaped ventilation duct are welded to the embedded steel plate below the conical surface, the lower side of the ventilation cage is welded to the embedded steel plate below the conical surface, and the upper side of the ventilation cage is welded to the embedded steel plate of the warehouse wall.

6. The ventilation system for a centralized grain storage silo according to claim 1, characterized in that: The ventilation cage includes an upper plate and a lower plate, the lower plate is parallel to the warehouse wall, the lower end of the lower plate is welded to the embedded steel plate below the cone surface, the upper end of the lower plate is fixedly connected to the lower end of the upper plate, the upper end of the upper plate is welded to the embedded steel plate of the warehouse wall, and the angle between the upper plate and the lower plate is an obtuse angle.

7. The ventilation system for a centralized grain storage bin according to claim 6, characterized in that: A transverse reinforcement is welded at the connection between the lower plate and the upper plate, and a second reinforcement is welded at intervals on the outer surface of the ventilation cage. The second reinforcement is a steel plate whose shape matches that of the ventilation cage, and the transverse reinforcement is welded to the second reinforcement.

8. The ventilation system for a centralized grain storage bin according to claim 1, characterized in that: The U-shaped ventilation pipe arranged on the conical surface is communicated with the ventilation cage. The U-shaped ventilation pipe arranged on the conical surface is arranged on the center line of the conical surface. The U-shaped ventilation pipe on the conical surface is communicated with the ventilation cage through a plug pipe fitting. The lower end of the plug pipe fitting is welded to the upper end of the U-shaped ventilation pipe. The upper end of the plug pipe fitting is welded to the ventilation cage. The cross-section of the plug pipe fitting is U-shaped, which is the same as the cross-section of the U-shaped ventilation pipe. The upper end of the plug pipe fitting matches the outer surface of the ventilation cage. The outer surface of the plug pipe fitting and the outer surface of the U-shaped ventilation pipe form a smooth curved surface.

9. The ventilation system for a centralized grain storage bin according to claim 1, characterized in that: The U-shaped ventilation duct arranged at the intersection of adjacent conical surfaces is a U-shaped ventilation duct that is not connected to the ventilation cage. A conical ventilation body is fixed to the upper end of the U-shaped ventilation duct that is not connected to the ventilation cage. The lower end of the conical ventilation body is a U-shape with the same cross-section as the U-shaped ventilation duct. Two side edges of the conical ventilation body are respectively fixed on adjacent conical surfaces. The top of the conical ventilation body is fixed at the intersection of adjacent conical surfaces. The outer surface of the conical ventilation body forms a smooth curved surface with the outer surface of the U-shaped ventilation duct.

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