Airflow variable grain drying section, drying apparatus and method of operation

Abstract

The application discloses a grain drying section with variable air flow, a drying device and a working method, and solves the problem that the air flow mode in the grain drying section in the prior art is fixed and cannot be adjusted, and has the beneficial effect that the air flow mode of the drying section can be adjusted, and the specific scheme is as follows: a grain drying section with variable air flow, which comprises a support frame, at least two layers of drying angle boxes are supported in the support frame, both ends of the drying angle boxes are communicated with the outside through the support frame, the part of the drying angle boxes in the support frame is provided with a ventilation opening, a wind adjusting component is supported on the outer side of the support frame at the position where the drying angle box is communicated with the outside, the wind adjusting component is located on the air inlet side and the air outlet side of the drying angle box, the wind adjusting component is movable relative to the support frame, the wind adjusting component is provided with at least two layers of communication openings, and in the process that the wind adjusting component moves relative to the support frame, the communication openings of one layer can be communicated with the drying angle box, so that the flow path of the hot air entering the support frame is changed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of grain drying, in particular to a grain drying section with variable air flow, a drying equipment and a working method. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute prior art.

[0003] Grain safety is an important issue in current agricultural development, and drying the harvested grains to a safe moisture level by mechanical equipment is a key link in current agricultural production. The drying process of traditional drying towers is determined by the fixed drying section structure. For example, Chinese patent application CN201320116043.7 discloses a forward and reverse flow type grain drying tower, which is provided with multiple forward flow drying layers, multiple reverse flow drying layers, and multiple slow recovery layers. That is, the inlet and outlet air ports and the upper and lower combinations of the drying section in the existing drying equipment determine that it only has one or two drying processes in the forward flow, reverse flow, and mixed flow modes, and the drying process of each section is determined and cannot be changed or adjusted, which not only affects the drying efficiency, but also makes the entire drying equipment unable to adjust the drying strategy for different moisture contents and different types of grains, resulting in heat loss, insufficient drying, and waist explosion.

[0004] Chinese patent application CN202410927731.4 discloses a circulating grain dryer with multiple drying layers, which is provided with a first drying box, and the first drying box is provided with a first connecting plate and a second connecting plate to form a drying angle box. However, the air flow in the first drying box cannot be adjusted according to the demand. SUMMARY

[0005] In view of the deficiencies of the prior art, the purpose of the present application is to provide a grain drying section with variable air flow, which can change the positions of the inlet and outlet air ports before and after the grain drying section, and thus change the flow path of the air flow in the grain drying section.

[0006] In order to achieve the above-mentioned purpose, the present application is realized by the following technical scheme:

[0007] A grain drying section with variable air flow, comprising a support frame, at least two drying angle boxes are supported in the support frame, both ends of the drying angle box are communicated with the outside through the support frame, the part of the drying angle box located in the support frame is provided with a ventilation port, the support frame supports an air adjusting member on the outside of the place where the drying angle box is communicated with the outside, the air adjusting member is located on the air inlet side and the air outlet side of the drying angle box, the air adjusting member is movable relative to the support frame, the air adjusting member is provided with at least two layers of communication ports, and one of the communication ports can be communicated with the drying angle box during the movement of the air adjusting member relative to the support frame, so as to change the flow path of the hot air entering the support frame.

[0008] The air flow variable grain drying section as claimed in claim 1, wherein the support frame is provided with an open slot on the outer side of the drying angle box communicating with the outside, and the air adjusting member is arranged in the open slot, and the length of the air adjusting member is less than the length of the open slot.

[0009] The air flow variable grain drying section as claimed in claim 1, wherein the support frame is provided with L-shaped slots on the upper side and the lower side of the opposite sides, and the two L-shaped slots arranged oppositely form the open slot.

[0010] The support frame is provided with a guide wheel in the L-shaped slot, and the guide wheel is rotatable relative to the L-shaped slot.

[0011] The air flow variable grain drying section as claimed in claim 1, wherein the air adjusting members on the two sides are of the same structure, and the drying angle boxes of the adjacent two layers of the drying angle boxes are arranged staggeredly when the two vertical communication ports of the adjacent two layers of the communication ports are located in the same vertical plane, or the communication ports of the adjacent two layers of the communication ports are arranged staggeredly when the two vertical drying angle boxes of the adjacent two layers of the drying angle boxes are located in the same vertical plane, and the arrangement positions of the communication ports of the air adjusting members correspond to the arrangement positions of the drying angle boxes.

[0012] The air flow variable grain drying section as claimed in claim 1, wherein one end of the support frame is fixed with a telescopic member, the telescopic end of the telescopic member is connected with a connecting push rod, the connecting push rod is connected with the air adjusting member, the telescopic member and the connecting push rod drive the air adjusting member to perform linear reciprocating motion relative to the support frame, and the telescopic members on the two sides are connected with a controller.

[0013] The air flow variable grain drying section as claimed in claim 1, wherein one end of the support frame forms a recess, the support frame is provided with an ear on the two sides of the recess, the fixed end of the telescopic frame is fixed to an end plate at one end of the support frame, the telescopic end of the telescopic member is connected with the connecting push rod through a connecting plate, the connecting push rod and the telescopic member are arranged in parallel with each other, and the connecting push rod passes through the ear of the support frame.

[0014] The air flow variable grain drying section as claimed in claim 1, wherein the distance between the two adjacent layers of the communication ports is 1.3-1.8 times the height of the drying angle box, and the distance between the two adjacent communication ports in the same layer of the communication ports is 1-1.5 times the width of the drying angle box.

[0015] The air flow variable grain drying section as claimed in claim 1, wherein the longitudinal section of the drying angle box is a pentagon, the angle of the top of the drying angle box is 50-80°, the two sides of the bottom side of the drying angle box are lower side, and the length of the upper side of the drying angle box is greater than the length of the lower side.

[0016] In a second aspect, the present application discloses a drying device, which comprises at least two grain drying sections with variable air flow as described above, and the support frames of two adjacent sections are arranged in a vertical manner and connected.

[0017] In a third aspect, the present application discloses a working method of the drying device, which comprises the following steps:

[0018] The air adjusting members of the two adjacent grain drying sections are synchronously moved:

[0019] The air adjusting member on the air inlet side of the drying angle box shields the lower drying angle box, the communication port on the upper layer of the air inlet side is communicated with the upper drying angle box, the air adjusting member on the air outlet side of the drying angle box shields the upper drying angle box, the communication port on the lower layer of the air outlet side is communicated with the lower drying angle box, the hot air enters the support frame from the upper drying angle box and contacts with the drying object, and then flows out from the lower drying angle box on the air outlet side, thereby forming the down-flow hot air drying.

[0020] Alternatively, the air adjusting member on the air inlet side of the drying angle box shields the upper drying angle box, the communication port on the lower layer of the air inlet side is communicated with the lower drying angle box, the air adjusting member on the air outlet side of the drying angle box shields the lower drying angle box, the communication port on the upper layer of the air outlet side is communicated with the upper drying angle box, the hot air enters the support frame from the lower drying angle box and contacts with the drying object, and then flows out from the upper drying angle box on the air outlet side, thereby forming the up-flow hot air drying.

[0021] The air adjusting members of the two adjacent grain drying sections are not synchronously moved: the up-flow hot air drying is performed in the upper grain drying section, and the down-flow hot air drying is performed in the lower grain drying section, thereby forming the overall mixed flow state; or the up-flow hot air drying is performed in the lower grain drying section, and the down-flow hot air drying is performed in the upper grain drying section, thereby forming the overall mixed flow state.

[0022] The present application has the following advantages:

[0023] 1) In the present application, the multiple layers of drying angle boxes are supported by the support frame, the two ends of the drying angle box are communicated with the outside, the air adjusting members are arranged on the outer side of the support frame, the air adjusting members are movable relative to the support frame, the air adjusting members are arranged in the communication ports with the same number of layers of drying angle boxes, the communication ports can be communicated with the drying angle boxes during the movement of the air adjusting members relative to the support frame, the communication between the two sides of the drying angle boxes and the outside is realized by adjusting the air adjusting members on the air inlet side and the air outlet side, the flow path of the air flow in the grain drying section is adjusted, the air flow is variable, the drying efficiency is improved, and the air flow mode of the grain drying section can be adjusted according to different types of grains.

[0024] 2) The outer side of the support frame in the application is provided with an open slot, and the air adjusting member is arranged in the open slot, which facilitates the movement of the air adjusting member relative to the support frame and ensures that the air adjusting member will not be separated from the support frame during the movement of the air adjusting member. The open slot is formed by an L-shaped slot, and the side of the L-shaped slot limits the air adjusting member to avoid separation of the air adjusting member from the open slot. In addition, the support frame is provided with a guide wheel in the L-shaped slot to ensure smooth movement of the air adjusting member.

[0025] 3) In order to avoid the simultaneous opening or closing of the adjacent two layers of drying angle boxes, and to realize that not all layers of drying angle boxes on the air inlet side are opened, or not all layers of drying angle boxes on the air outlet side are opened, the drying angle boxes of the adjacent two layers are arranged in a staggered manner, or the communication ports of the adjacent two layers are arranged in a staggered manner.

[0026] 4) The support frame is provided with a recess at one end for the arrangement of the telescopic member. The telescopic end of the telescopic member is connected with the connecting push rod, the connecting push rod passes through the ear of the support frame and is connected with the air adjusting member. The ear of the support frame effectively guides the movement of the connecting push rod to ensure the linearity of the movement of the air adjusting member.

[0027] 5) The drying equipment provided by the application is a drying equipment in which multiple grain drying sections are assembled into a whole. The airflow flow mode of each grain drying section can be adjusted. When the grain drying section is two sections, two drying modes of the combination of the forward flow, the reverse flow and the mixed flow can be realized. The airflow modes of the adjacent two grain drying sections can be the same or different according to the object to be dried. The airflow flow path is changed, which is beneficial to improve the drying efficiency of the grain. After the type of the grain is changed, the drying mode of the grain drying section can be changed. Thus, the drying equipment is provided with more drying functions, one machine is used for multiple purposes, and the whole can be suitable for different types of grains to avoid the problems such as heat loss. BRIEF DESCRIPTION OF DRAWINGS

[0028] The drawings accompanying the specification of the application form a part of the application and serve to further understand the application. The schematic embodiments of the application and the description thereof are used to explain the application and do not constitute an improper limitation on the application.

[0029] Figure 1 is a schematic view of a grain drying section with variable airflow according to one or more embodiments of the application.

[0030] Figure 2 is a front view of a grain drying section with variable airflow according to one or more embodiments of the application.

[0031] Figure 3 is a schematic view of a grain drying section with variable airflow according to one or more embodiments of the application in a forward flow hot air drying state in which the airflow enters the air inlet.

[0032] Figure 4 is a schematic view of the air flow variable grain drying section according to one or more embodiments of the present application in a cross-flow hot air drying state with the air flow entering the air inlet.

[0033] Figure 5 is a schematic view of the air flow variable grain drying section according to one or more embodiments of the present application in a cross-flow hot air drying state with the air flow entering the air inlet.

[0034] Figure 6 is a schematic view of the air flow variable grain drying section according to one or more embodiments of the present application in a cross-flow hot air drying state with the air flow entering the air inlet.

[0035] In the drawings: the mutual spacing or dimensions are exaggerated for showing the positions of the parts, and the schematic views are merely illustrative.

[0036] Wherein: 1. support frame, 2. drying angle box, 3. end plate, 4. linear bearing seat, 5. telescopic member, 6. connecting plate, 7. connecting push rod, 8. mounting seat, 9. air adjusting member, 10. guide wheel, 11. L-shaped groove, 12. ear edge, 13. upper edge side, 14. lower edge side, 15. communication port, 16. support plate, 17. flange, 18. positioning pin. DETAILED DESCRIPTION

[0037] It should be noted that the following detailed description is exemplary in nature and is intended to provide further description of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0038] It is to be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising", when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0039] As introduced in the background section, the problem of the fixed and non-adjustable air flow in the grain drying section in the prior art, in order to solve the above technical problem, the present application provides an air flow variable grain drying section.

[0040] Example one

[0041] In a typical embodiment of the present application, reference is made to Figure 1As shown in the figure, a variable air flow grain drying section includes a support frame 1, at least two layers of drying angle boxes 2 are supported in the support frame 1, both ends of the drying angle box are communicated with the outside through the support frame 1, the part of the drying angle box 2 in the support frame 1 is provided with a ventilation opening, the support frame 1 is provided with an air adjusting member 9 on the outer side of the drying angle box communicated with the outside, the air adjusting member 9 is located on the air inlet side and the air outlet side of the drying angle box 2, the air adjusting member 9 is movable relative to the support frame, the air adjusting member 9 is provided with at least two layers of communication openings 15, one of the communication openings can be communicated with the drying angle box 2 in the process of moving the air adjusting member relative to the support frame, so as to change the flow path of the hot air entering the support frame 1.

[0042] In the embodiment, the support frame 1 includes lengthwise support plates 16, the drying angle boxes 2 are supported by the lengthwise support plates 16, and end plates 3 are arranged in the width direction of the support frame, the end plates 3 are connected to the support plates 16 on both sides, wherein one end of the support frame 1 forms a recess, that is, the end plate is not flush with the end of the support plate 16, but forms a recess with the part of the support plates on both sides beyond the end plate, so as to facilitate the installation of the telescopic member, and the support frame 1 is provided with lug edges 12 on both sides of the recess, that is, on both sides of the end of the support plate close to the telescopic member, the lug edges 12 are turned outwards from the end side of the support plate, and the lug edges 12 are vertically connected to the support plate;

[0043] In addition, the upper side and the lower side of the support plate 16 are provided with flanges 17, the upper side and the lower side of the end plate are provided with flanges, the flanges 17 are provided with openings, and the bolts pass through the adjacent two grain drying sections and are fastened by nuts to realize the connection of the adjacent two grain drying sections; and, referring to Figure 6 As shown in the figure, the flange on the upper side is provided with a positioning pin 18, so as to be inserted into the upper grain drying section.

[0044] It is easy to understand that the support plate on one side of the support frame is connected with the hot air channel, and the support plate on the other side of the support frame is connected with the return air channel.

[0045] It should be noted that the support frame 1 is provided with an open slot on the outer side of the drying angle box 2 communicated with the outside, the air adjusting member 9 is arranged in the open slot, the length of the air adjusting member is less than the length of the open slot, that is, the length of the support plate, the upper side and the lower side of the opposite two side faces of the support frame are provided with L-shaped slots 11, that is, the flanges on the upper side and the lower side of the support plate are bent towards the center of the air adjusting member to form L-shaped slots 11, the two L-shaped slots 11 arranged oppositely form the open slot, the side of the L-shaped slot 11 limits the air adjusting member 9, so as to avoid the air adjusting member from being separated from the open slot, and to ensure that the air adjusting member 9 can move along the L-shaped slot 11;

[0046] It is easy to understand that the support frame 1 is provided with a guide wheel 10 in the L-shaped groove 11, that is, the guide wheel 10 is provided at the flange of the upper side and the lower side of the support plate, and specifically, two or other numbers of guide wheels can be provided, and the adjacent two guide wheels 10 are arranged at a distance, and the guide wheel 10 is rotatably installed at the flange, and the guide wheel is rotatable relative to the flange, and the guide surface of the guide wheel 10 can be in contact with the air adjusting member 9, which is also beneficial to the smooth movement of the air adjusting member.

[0047] It is easy to understand that at least two layers of drying angle boxes 2 can be arranged in the support frame 1, and a plurality of drying angle boxes 2 are arranged in each layer. The longitudinal section of the drying angle box 2 is a pentagon, and of course it can also be other shapes. The bottom of the drying angle box 2 is provided with a ventilation opening to allow hot air to flow into the inside of the drying section through the ventilation opening. In the present embodiment, when the longitudinal section of the drying angle box is a pentagon, the angle of the top of the drying angle box is 50-80°, which can be 60°. The two sides of the upper side of the drying angle box are upper side 13, and the two sides of the bottom side of the drying angle box are lower side 14. The length of the upper side 13 of the drying angle box is greater than the length of the lower side 14, which is beneficial to the uniform distribution of the external grains and avoids local accumulation.

[0048] Reference Figure 2 As shown, the shape of the air adjusting member 9 communication port is the same as the shape of the longitudinal section of the drying angle box 2. In the present embodiment, two layers of drying angle boxes are provided, and correspondingly, two layers of communication ports are provided in the air adjusting member. The distance c between the adjacent two layers of communication ports is 1.3-1.8 times the height d of the drying angle box, which can be 1.5 times. The distance e between the adjacent two communication ports in the same layer is 1-1.5 times the width of the drying angle box, which can be 1 times. The sum of the blank height a of the top of the upper layer communication port and the blank height b of the bottom of the lower layer communication port is equal to the distance c between the adjacent two layers of communication ports.

[0049] It should be noted that when the vertical two communication ports in the adjacent two layers of communication ports 15 are located in the same vertical plane, the drying angle boxes of the adjacent two layers of drying angle boxes are arranged in a staggered manner, or when the vertical two drying angle boxes in the adjacent two layers of drying angle boxes are located in the same vertical plane, the communication ports of the adjacent two layers of communication ports are arranged in a staggered manner. The setting position of the air adjusting member communication port corresponds to the setting position of the drying angle box 2, so that during the movement of the air adjusting member, the air adjusting member 9 of one layer can shield the drying angle box of one layer.

[0050] In other examples, when the drying angle box is provided with three layers, the air adjusting member is also provided with three layers of communication ports. During the movement of the air adjusting member, the communication port located in the middle of the three layers of communication ports can be in communication with the drying angle box 2.

[0051] In this embodiment, the air adjusting member 9 is specifically an air adjusting plate, and the structures of the air adjusting members on the two sides are the same, that is, the positions of the communication openings are the same. Of course, in other examples, the positions of the communication openings of the air adjusting members on the two sides can be different, as long as the communication opening of one layer on the air inlet side or the air outlet side can be communicated with the corresponding layer of the drying angle box during the movement of the air adjusting member.

[0052] In this embodiment, the end plate at the recess of the support frame 1 is fixed with the telescopic member 5, the telescopic member 5 is fixed to the end plate 3 through the support, the telescopic member 5 is specifically a conventional pneumatic push rod, the telescopic end of the telescopic member 5 is connected with one end of the connecting push rod 7 through the connecting plate 6 after exceeding the ear edge 12 of the support plate, the other end of the connecting push rod 7 is connected with the air adjusting member 9 through the mounting seat 8 after penetrating through the ear edge 12 of the support plate 16, the linear bearing seat 4 is arranged between the connecting push rod 7 and the ear edge 12, the connecting push rod 7 and the telescopic member 5 are arranged in parallel with each other, the mounting seat 8 is specifically a mounting plate, the mounting plate is provided with an opening, the mounting plate can be mounted at the air adjusting member 9, the mounting plate is provided with a convex portion, a clamping groove is arranged at the convex portion, one end of the connecting push rod 7 is clamped into the clamping groove, so that the air adjusting member 9 is driven to move linearly relative to the support frame 1 through the telescopic member 5 and the connecting push rod, and the telescopic members on the two sides are connected with the controller.

[0053] The controller can be a conventional PLC controller or other type of controller, and the controller can be the controller of the drying equipment. The movement of the telescopic member is controlled by the controller, and the movement distance of the corresponding telescopic member can be set in the controller for different types of grains. Therefore, the on-site worker only needs to confirm the object to be dried, and the controller can quickly adjust the movement distance of the air adjusting member relative to the support frame.

[0054] The grain drying section provided in this embodiment supports the plurality of layers of drying angle boxes 2, the two ends of the drying angle boxes are communicated with the outside, the outer side surface of the support frame 1 is provided with the air adjusting member 9, the air adjusting member is movable relative to the support frame, the air adjusting member is arranged at the communication opening 15 with the same number of layers of drying angle boxes, and the communication opening can be communicated with the drying angle box during the movement of the air adjusting member relative to the support frame. Through the adjustment of the air adjusting members on the air inlet side and the air outlet side, the communication between the different layers of drying angle boxes on the two sides and the outside is realized, so as to adjust the flow path of the airflow in the grain drying section, so that the airflow is variable. This can not only improve the drying efficiency, but also adjust the airflow flow mode of the grain drying section for different types of grains.

[0055] Embodiment two

[0056] The embodiment provides a drying equipment, which comprises at least two grain drying sections with variable airflow.

[0057] A working method of a drying equipment comprises the following contents:

[0058] After the grain enters the grain drying section, the grain is stacked between the drying angle boxes 2 in the drying section, and the drying angle boxes 2 become the hot air flow space;

[0059] The air adjusting members of the adjacent two grain drying sections move synchronously:

[0060] Referring to Figure 3 and Figure 4 , the telescopic members 5 at the air inlet side of the drying angle boxes are extended, the air adjusting members block the lower drying angle boxes, the communication ports at the air inlet side of the upper drying angle boxes are communicated with the upper drying angle boxes, the telescopic members 5 at the air outlet side of the drying angle boxes are retracted, the air adjusting members block the upper drying angle boxes, the communication ports at the air outlet side of the lower drying angle boxes are communicated with the lower drying angle boxes, the hot air (air flow) enters the support frame from the air inlets of the upper drying angle boxes and contacts the drying objects, and then flows out from the air outlets of the lower drying angle boxes, forming the down-flow hot air drying (referring to the same flowing mode of the hot air and the grain falling mode);

[0061] Alternatively, referring to Figure 5 and Figure 6 , the telescopic members 5 at the air inlet side of the drying angle boxes are retracted, the air adjusting members block the upper drying angle boxes, the communication ports at the air inlet side of the lower drying angle boxes are communicated with the lower drying angle boxes, the telescopic members 5 at the air outlet side of the drying angle boxes are extended, the air adjusting members block the lower drying angle boxes, the communication ports at the air outlet side of the upper drying angle boxes are communicated with the upper drying angle boxes, the hot air enters the support frame from the air inlets of the lower drying angle boxes and contacts the drying objects, and then flows out from the air outlets of the upper drying angle boxes, forming the up-flow hot air drying (referring to the opposite flowing direction of the grain and the hot air);

[0062] The air adjusting members of the adjacent two grain drying sections do not move synchronously: in the air inlet side direction, the telescopic members 5 of the upper grain drying section are extended, and the telescopic members 5 of the lower grain drying section are retracted; in the air outlet side direction, the telescopic members 5 of the upper grain drying section are retracted, and the telescopic members 5 of the lower grain drying section are extended, at this time, the upper grain drying section is down-flow hot air drying, and the lower grain drying section is up-flow hot air drying; or, in the air inlet side direction, the telescopic members 5 of the upper grain drying section are retracted, and the telescopic members 5 of the lower grain drying section are extended; in the air outlet side direction, the telescopic members 5 of the upper grain drying section are extended, and the telescopic members 5 of the lower grain drying section are retracted, at this time, the upper grain drying section is up-flow hot air drying, and the lower grain drying section is down-flow hot air drying, realizing the different air flow flowing modes of the upper and lower grain drying sections and forming the overall mixed flow state.

[0063] When the drying is completed, part of the grain is discharged from the bottom of the grain drying section, and the grain at the upper part slides and falls to the two sides of the drying angle boxes 2 through the bottom of the drying angle boxes 2, so that the grain flows uniformly and avoids local accumulation to affect the grain flow and cause local over-drying of the grain.

[0064] The above merely provides the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. A variable airflow grain drying section, characterized in that, The support frame includes at least two layers of drying angle boxes supported in the support frame, both ends of the drying angle boxes are communicated with the outside through the support frame, the part of the drying angle boxes in the support frame is provided with a ventilation opening, the support frame is provided with an air adjusting member on the outer side of the support frame at the position where the drying angle box is communicated with the outside, the air adjusting member is located on the air inlet side and the air outlet side of the drying angle box, the air adjusting member is movable relative to the support frame, the air adjusting member is provided with at least two layers of communication openings, one of the communication openings can be communicated with the drying angle box during the movement of the air adjusting member relative to the support frame, so as to change the flow path of the hot air entering the support frame; One end of the support frame is fixed with a telescopic member, the telescopic end of the telescopic member is connected with a connecting push rod, the connecting push rod is connected with the air adjusting member, so that the air adjusting member is driven to move linearly relative to the support frame through the telescopic member and the connecting push rod, and both sides of the telescopic member are connected with a controller; One end of the support frame is formed with a recess, and the support frame is provided with an ear on both sides of the recess, and the fixed end of the telescopic frame is fixed to the end plate at one end of the support frame; The upper side and the lower side of the opposite sides of the support frame are provided with L-shaped grooves, and the two L-shaped grooves arranged oppositely form an open groove; The support frame is provided with a guide wheel in the L-shaped groove, and the guide wheel is rotatable relative to the L-shaped groove. Through the adjustment of the air adjusting members on both sides of the air inlet side and the air outlet side, the communication of the drying angle boxes of different layers on both sides with the outside is realized, so as to adjust the flow path of the air flow in the grain drying section, so that the air flow is variable.

2. A variable airflow grain drying section according to claim 1 wherein, The support frame is provided with an open groove on the outer side of the support frame at the position where the drying angle box is communicated with the outside, and the air adjusting member is arranged in the open groove, and the length of the air adjusting member is less than the length of the open groove.

3. A variable airflow grain drying section according to claim 1 wherein, The structures of the air adjusting members on both sides are the same, the drying angle boxes of adjacent two layers are arranged in a staggered manner when the two vertical communication openings in the adjacent two layers of communication openings are located in the same vertical plane, or the communication openings of the adjacent two layers of communication openings are arranged in a staggered manner when the two vertical drying angle boxes in the adjacent two layers of drying angle boxes are located in the same vertical plane.

4. A variable airflow grain drying section according to claim 1 wherein, The telescopic end of the telescopic member is connected with the connecting push rod through a connecting plate, the connecting push rod and the telescopic member are arranged in parallel with each other, and the connecting push rod passes through the ear of the support frame.

5. A variable airflow grain drying section according to claim 1 wherein, The distance between the adjacent two layers of communication openings is 1.3-1.8 times the height of the drying angle box, and the distance between the adjacent two communication openings in the same layer of communication openings is 1-1.5 times the width of the drying angle box.

6. A variable airflow grain drying section according to claim 1 wherein, The longitudinal section of the drying angle box is a pentagon, the angle of the top of the drying angle box is 50-80°, the two sides of the bottom side of the drying angle box are lower side, and the length of the upper side of the drying angle box is greater than the length of the lower side.

7. A drying apparatus, characterized by, The support frame includes at least two layers of drying angle boxes supported in the support frame, both ends of the drying angle boxes are communicated with the outside through the support frame, the part of the drying angle boxes in the support frame is provided with a ventilation opening, the support frame is provided with an air adjusting member on the outer side of the support frame at the position where the drying angle box is communicated with the outside, the air adjusting member is located on the air inlet side and the air outlet side of the drying angle box, the air adjusting member is movable relative to the support frame, the air adjusting member is provided with at least two layers of communication openings, one of the communication openings can be communicated with the drying angle box during the movement of the air adjusting member relative to the support frame, so as to change the flow path of the hot air entering the support frame; 8. A method of operating a drying apparatus as claimed in claim 7, wherein, The support frame is provided with an open groove on the outer side of the support frame at the position where the drying angle box is communicated with the outside, and the air adjusting member is arranged in the open groove, and the length of the air adjusting member is less than the length of the open groove. The structures of the air adjusting members on both sides are the same, the drying angle boxes of adjacent two layers are arranged in a staggered manner when the two vertical communication openings in the adjacent two layers of communication openings are located in the same vertical plane, or the communication openings of the adjacent two layers of communication openings are arranged in a staggered manner when the two vertical drying angle boxes in the adjacent two layers of drying angle boxes are located in the same vertical plane. The telescopic end of the telescopic member is connected with the connecting push rod through a connecting plate, the connecting push rod and the telescopic member are arranged in parallel with each other, and the connecting push rod passes through the ear of the support frame. The distance between the adjacent two layers of communication openings is 1.3-1.8 times the height of the drying angle box, and the distance between the adjacent two communication openings in the same layer of communication openings is 1-1.5 times the width of the drying angle box. The longitudinal section of the drying angle box is a pentagon, the angle of the top of the drying angle box is 50-80°, the two sides of the bottom side of the drying angle box are lower side, and the length of the upper side of the drying angle box is greater than the length of the lower side. The support frame includes at least two layers of drying angle boxes supported in the support frame, both ends of the drying angle boxes are communicated with the outside through the support frame, the part of the drying angle boxes in the support frame is provided with a ventilation opening, the support frame is provided with an air adjusting member on the outer side of the support frame at the position where the drying angle box is communicated with the outside, the air adjusting member is located on the air inlet side and the air outlet side of the drying angle box, the air adjusting member is movable relative to the support frame, the air adjusting member is provided with at least two layers of communication openings, one of the communication openings can be communicated with the drying angle box during the movement of the air adjusting member relative to the support frame, so as to change the flow path of the hot air entering the support frame; The air adjusting member of the air inlet side of the drying angle box shields the lower layer drying angle box, the communication port of the upper layer of the air inlet side communicates with the upper layer drying angle box, the air adjusting member of the air outlet side of the drying angle box shields the upper layer drying angle box, the communication port of the lower layer of the air outlet side communicates with the lower layer drying angle box, the hot air enters the support frame from the upper layer drying angle box and contacts with the drying object, and then flows out from the lower layer drying angle box of the air outlet side, forming the down-flow hot air drying. Or, the air adjusting member of the air inlet side of the drying angle box shields the upper layer drying angle box, the communication port of the lower layer of the air inlet side communicates with the lower layer drying angle box, the air adjusting member of the air outlet side of the drying angle box shields the lower layer drying angle box, the communication port of the upper layer of the air outlet side communicates with the upper layer drying angle box, the hot air enters the support frame from the lower layer drying angle box and contacts with the drying object, and then flows out from the upper layer drying angle box of the air outlet side, forming the up-flow hot air drying. The air adjusting members of the adjacent two grain drying sections do not move synchronously: the up-side grain drying section performs down-flow hot air drying, the lower-side grain drying section performs up-flow hot air drying, forming the whole mixed flow state; or, the up-side grain drying section performs up-flow hot air drying, the lower-side grain drying section performs down-flow hot air drying, forming the whole mixed flow state.

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