CN209991732U

CN209991732U - Sectional drying equipment

Info

Publication number: CN209991732U
Application number: CN201920458329.0U
Authority: CN
Inventors: 吴杰俊
Original assignee: WANHUA MACHINE CO Ltd CHANGSHA; Hunan Chenzhou Grain & Oil Machinery Co Ltd
Current assignee: WANHUA MACHINE CO Ltd CHANGSHA; Hunan Chenzhou Grain & Oil Machinery Co Ltd
Priority date: 2019-04-04
Filing date: 2019-04-04
Publication date: 2020-01-24
Anticipated expiration: 2029-04-04

Abstract

The utility model provides a segmentation drying equipment. The segmented drying equipment comprises a hot air blower, a hot air input box, a warm and humid hot air transfer box, a cooling air output box, air draft equipment, a buffer layer, a heat preservation and moisture preservation tempering layer, a core drying layer, a middle tempering layer and a humid hot air drying layer which are arranged in a run-through manner; the hot air blower is communicated with the core drying layer through a hot air input box, and the air draft equipment is communicated with the moisture-containing hot air drying layer through a cooling air output box; a transfer air outlet is formed in the side wall of the core drying layer, a transfer air inlet is formed in the side wall of the wet hot air containing drying layer, and the transfer air outlet is communicated with the transfer air inlet through a warm-wet hot air transfer box; the hot air blower and the air draft equipment are arranged on the same side along the height direction of the sectional drying equipment. The application provides a segmentation drying equipment, drying efficiency is high, and is more energy-conserving, and the waist-bursting rate increase value, the crack rate increase value and the breakage rate increase value by dry cereal are low, guarantee that the germination percentage does not reduce, and qualities such as taste value, outward appearance and processability are better.

Description

Sectional drying equipment

Technical Field

The utility model relates to a drying equipment field particularly, relates to a segmentation drying equipment.

Background

Existing drying equipment includes dryers of static construction, dryers of cross-flow construction and dryers of mixed-flow construction.

The dryer with the static structure is high in drying efficiency, but the dryer with the static counter-flow structure is low in moisture uniformity of dried materials, low in drying yield of unit occupied area, high in labor intensity and high in dust concentration of workers in the drying operation process, low in mechanization degree and suitable for small-batch material drying operation.

In the cross-flow type drying machine, the ratio of tempering time of grains in a tempering layer to drying time in a drying layer is greater than 5 and is generally between 12 and 15. In each drying cycle, the tempering time is long, the drying time is short, and the drying efficiency is low.

The drying machine with the mixed flow structure has the advantages that the ratio of tempering time of grains in a tempering layer to drying time in a drying layer is larger than 3 and is generally about 3-5. In each drying cycle, the tempering time is longer, the drying time is shorter, compared with a dryer with a cross-flow structure, the tempering time is reduced more, the drying time is increased more, and the drying efficiency is improved a lot.

However, if the average drying rate of the cross-flow type dryer and the mixed-flow type dryer needs to be increased, the temperature of hot air needs to be increased and the speed of the hot air needs to be increased, so that the problems that the indexes such as the increase value of the waist bursting rate, the increase value of the crushing rate, the unevenness of water content, the non-reduction of the germination rate and the like cannot reach the industrial standard and the like easily occur when the rice is dried.

In view of this, the present application is specifically made.

SUMMERY OF THE UTILITY MODEL

A first object of the utility model is to provide a segmentation drying equipment, drying efficiency is high, and is more energy-conserving, and the waist rate of exploding by dry cereal increases the value, the crack rate increases the value and the breakage increases the value low, guarantees that the germination percentage does not reduce, and quality such as taste value, outward appearance and processability are better.

In order to realize the above purpose of the utility model, the following technical scheme is adopted:

a sectional drying device comprises a hot air blower, a hot air input box, a warm-wet hot air transfer box, a cooling air output box, an air draft device, a buffer layer, a heat preservation and moisture preservation tempering layer, a core drying layer, an intermediate tempering layer and a wet-hot air containing drying layer, wherein the buffer layer, the heat preservation and moisture preservation tempering layer, the core drying layer, the intermediate tempering layer and the wet-hot air containing drying layer are arranged in a run-through;

the hot air blower is communicated with the core drying layer through the hot air input box, and the air draft equipment is communicated with the moisture-containing hot air drying layer through the cooling air output box;

the hot air blower and the air draft equipment are arranged on the same side along the height direction of the sectional drying equipment;

the core drying layer is kept away from the one end of hot-blast forced draught blower with contain wet hot-blast drying layer and keep away from the one end of air extraction equipment passes through warm and humid hot-blast transfer case intercommunication.

Preferably, the sectional drying equipment further comprises a core drying layer hot air input angular pipe, a core drying layer cooling air collection angular pipe, a humid hot air drying layer hot air input angular pipe and a humid hot air drying layer cooling air collection angular pipe;

hot-blast input horn shape pipe in the dry layer of core sets up in the dry layer of core and with hot-blast input case intercommunication, the dry layer cooling air of core is collected horn shape pipe and is set up in the dry layer of core and with warm and humid hot-blast transfer case intercommunication, contain the hot-blast input horn shape pipe in the dry layer of humid heat and set up in containing the dry layer of humid heat and with warm and humid hot-blast transfer case intercommunication, it sets up to contain the dry layer cooling air of humid heat and collect horn shape pipe contain the dry in situ of humid heat and with cooling air output case intercommunication.

Preferably, the sectional drying equipment further comprises a first sieve plate and a second sieve plate, the first sieve plate forms a core drying layer hot air duct, a first grain channel and a core drying layer cooling air duct which are alternately arranged in the core drying layer, and the second sieve plate forms a damp-hot air containing drying layer hot air duct, a second grain channel and a damp-hot air containing drying layer cooling air duct which are alternately arranged in the damp-hot air containing drying layer;

the hot air duct of the core drying layer is communicated with the hot air input box, the cooling air duct of the core drying layer is communicated with the warm and wet hot air transfer box, the hot air duct of the wet hot air drying layer is communicated with the warm and wet hot air transfer box, and the cooling air duct of the wet hot air drying layer is communicated with the cooling air output box.

Preferably, the buffer layer, the heat-preservation and moisture-retention tempering layer, the moisture-containing hot air drying layer, the middle tempering layer and the core drying layer are arranged in sequence from top to bottom;

the tempering layer cooling air that keeps warm and moisturizes is provided with first tempering layer cooling air collection horn shape pipe in the tempering layer that keeps warm and moisturizes, first tempering layer cooling air collection horn shape pipe that keeps warm and moisturizes with cooling air delivery box intercommunication.

Preferably, the sectional drying equipment further comprises a first warm and humid hot air branch pipe, and the warm and humid hot air transfer box is communicated with the buffer layer through the first warm and humid hot air branch pipe.

Preferably, the sectional drying equipment further comprises a tempering hot air branch pipe, a tempering hot air input box, a first tempering hot air input angular pipe and a first booster fan, wherein the first tempering hot air input angular pipe is arranged in the heat-preservation and moisture-preservation tempering layer and is communicated with the tempering hot air input box, and the heat-preservation and moisture-preservation hot air transfer box is communicated with the tempering hot air input box through the tempering hot air branch pipe; the first booster fan is arranged on the tempering hot air branch pipe.

More preferably, the sectional drying equipment further comprises a first return pipe, and the first return pipe is communicated with the buffer layer and the cooling air output box.

Preferably, the buffer layer, the tempering layer, the core drying layer, the middle tempering layer and the hot and humid air drying layer are arranged from top to bottom in sequence.

Preferably, the sectional drying equipment still include the warm hot-blast branch pipe of warm humid hot-blast input angle shape pipe in heat preservation and moisture preservation tempering layer and the warm humid hot-blast branch pipe of second, the warm humid hot-blast branch pipe setting in heat preservation and moisture preservation tempering in situ and with hot-blast input case intercommunication, the warm humid hot-blast branch pipe intercommunication of second the buffer layer with warm humid hot-blast transfer case.

Further preferably, segmentation drying equipment still includes hot-blast branch pipe, second booster fan, hot-blast branch bellows, the hot-blast input horny pipe of second slow su and the warm branchs layer cooling air collection horny pipe of moisturizing of second, the hot-blast input horny pipe of second slow su sets up the warm branchs layer of moisturizing and with hot-blast branch bellows intercommunication, the warm branchs layer cooling air collection horny pipe of second heat preservation moisturizing is in warm branchs layer of moisturizing and with warm wet hot-blast transfer case intercommunication, hot-blast branch bellows passes through hot-blast branch pipe with hot-blast input case intercommunication, second booster fan sets up on the hot-blast branch pipe.

Preferably, the sectional drying equipment further comprises a hot air supplementing box and an air adjusting device, the warm and humid hot air transfer box is communicated with the hot air input box through the hot air supplementing box, and the air adjusting device is arranged between the hot air supplementing box and the hot air input box.

Further preferably, the sectional drying equipment further comprises a hot air supply equalizing pipe and a built-in hot air supply pipe, the built-in hot air supply pipe is arranged in the middle tempering layer, the hot air supply equalizing pipe is arranged in the warm and humid hot air transfer box, one end of the built-in hot air supply pipe is communicated with the hot air supply equalizing box, and the other end of the built-in hot air supply pipe is communicated with the hot air supply equalizing pipe.

Preferably, the sectional drying equipment further comprises an external hot air pipe, and the external hot air pipe is arranged on the outer wall of the warm and humid hot air transfer box and is communicated with the supplementary hot air even air pipe.

Further preferably, the middle tempering layer is provided with a built-in hot air channel, one end of the built-in hot air channel is communicated with the hot air supplementing box, and the other end of the built-in hot air channel is communicated with the warm and humid hot air transfer box.

Preferably, the sectional drying equipment further comprises a supplementary hot air pipe, and the supplementary hot air pipe is communicated with the warm and humid hot air transfer box.

Compared with the prior art, the beneficial effects of the utility model are that:

(1) the waste heat and moisture can be better utilized, the quality of grains is not reduced under the condition of ensuring high drying efficiency, and the energy is saved;

(2) the increase value of the waist-popping rate, the increase value of the crack rate and the increase value of the crushing rate of the dried grains are low, so that the germination rate is not reduced;

(3) the taste value, the appearance, the processing performance and other qualities are better.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.

FIG. 1 is a schematic view of the external structure of a staged drying apparatus provided in example 1;

FIG. 2 is a schematic view of the internal structure of the staged drying apparatus provided in example 1;

FIG. 3 is a schematic view of the external structure of the staged drying apparatus provided in example 2;

FIG. 4 is a schematic view of the internal structure of the staged drying apparatus provided in example 2;

FIG. 5 is a schematic view of the external structure of the staged drying apparatus provided in example 3;

FIG. 6 is a schematic view of the internal structure of a staged drying apparatus provided in example 3;

FIG. 7 is a schematic view of the external structure of the staged drying apparatus provided in example 4;

FIG. 8 is a schematic view of the internal structure of a sectional drying apparatus provided in example 4;

FIG. 9 is a schematic view showing the external configuration of a staged drying apparatus provided in example 5;

FIG. 10 is a schematic view showing the internal structure of a sectional drying apparatus according to example 5;

FIG. 11 is a schematic view showing the external configuration of a staged drying apparatus provided in example 6;

FIG. 12 is a schematic view of the internal structure of the staged drying apparatus provided in example 6.

Reference numerals:

1-a hot air blower; 2-a hot air input box; 3-warm and humid hot air transfer box; 4-cooling air output box; 5-air draft equipment; 6-a buffer layer; 7-heat preservation and moisture preservation tempering layer; 8-drying the layer with moist heat air; 9-middle tempering layer; 10-core dry layer; 11-a first warm and humid hot air branch pipe; 12-feeding hot air into the horn-shaped pipe of the core drying layer; 13-core dry layer cooling air collection horn-shaped tube; 14-inputting the wet hot air-containing drying layer into the horn-shaped pipe; 15-drying layer cooling air containing wet hot air and collecting horn-shaped pipes; 16-a first heat-preserving moisture-preserving tempering layer cooling air collecting horn-shaped pipe; 17-supplement hot air pipe; 18-a material collecting hopper; 19-a hoist; 20-feeding grain conveying device; 21-a refining and distributing device; 22-hot air inlet pipe; 23-a transition air duct; 24-a material diversion hopper; 25-a discharge device; 26-a second warm and humid hot air branch pipe; 27-inputting hot air of the heat-preservation and moisture-preservation tempering layer into the horn-shaped pipe; 28-tempering hot air branch pipes; 29-tempering hot air input box; 30-inputting first tempering hot air into the horn-shaped pipe; 31-a first booster fan; 32-a hot air supply box; 33-a wind adjusting device; 34-external source hot air pipe; 35-supplying hot air homogenizing pipes; 36-built-in hot air supplement pipe; 37-arranging a heat-preservation and moisture-preservation tempering layer; 38-tempering hot air input layer; 39-lower heat preservation and moisture preservation tempering layer; 40-hot air branch pipes; 41-a second booster fan; 42-hot air branch bellows; 43-second tempering hot air input horn; 44-a second heat-preservation moisture-preservation tempering layer cooling air collecting horn-shaped pipe; 45-a first screen deck; 46-a second screen deck; 47-core dry layer hot air duct; 48-a first grain channel; 49-core drying layer cooling air duct; 50-hot air duct containing wet hot air drying layer; 51-a second grain channel; 52-cooling air ducts of the wet hot air drying layer; 53-built-in hot air channel; 54-a first return pipe; 55-second return conduit.

Detailed Description

The technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings and the detailed description, but those skilled in the art will understand that the following described embodiments are a part of the embodiments of the present application, rather than all embodiments, and are only used for illustrating the present application and should not be construed as limiting the scope of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

As shown in fig. 1 and 2, a sectional drying device comprises a hot air blower 1, a hot air input box 2, a warm and humid hot air transfer box 3, a cooling air output box 4, an air draft device 5, and a buffer layer 6, a heat preservation and moisture preservation tempering layer 7, a humid hot air drying layer 8, a middle tempering layer 9 and a core drying layer 10 which are arranged in a penetrating manner from top to bottom, wherein the hot air blower 1 is communicated with the core drying layer 10 through the hot air input box 2, and the air draft device 5 is communicated with the humid hot air drying layer 8 through the cooling air output box 4; the hot air blower 1 and the air draft device 5 are arranged on the same side; one end of the core drying layer 10 far away from the hot air blower 1 is communicated with one end of the damp and hot air containing drying layer 8 far away from the air draft device 5 through the warm and damp hot air transfer box 3.

In a preferred embodiment, the staged drying device further comprises a first warm and humid hot air branch pipe 11, and the warm and humid hot air transfer box 3 is communicated with the buffer layer 6 through the first warm and humid hot air branch pipe 11.

In another preferred embodiment, the sectional drying equipment is further provided with one or more groups of core drying layer hot air input angular pipes 12, core drying layer cooling air collection angular pipes 13, wet hot air-containing drying layer hot air input angular pipes 14, wet hot air-containing drying layer cooling air collection angular pipes 15 and first heat-preserving and moisture-preserving tempering layer cooling air collection angular pipes 16; hot-blast input horn shape pipe 12 of core drying layer sets up in core drying layer 10 and communicates with hot-blast input box 2, core drying layer cooling air is collected horn shape pipe 13 and is set up in core drying layer 10 and communicate with warm and humid hot-blast transfer case 3, contain hot-blast input horn shape pipe 14 of hot-blast input of humid hot-blast drying layer and set up in containing humid hot-blast drying layer 8 and communicate with warm and humid hot-blast transfer case 3, contain humid hot-blast drying layer cooling air and collect horn shape pipe 15 and set up in containing humid hot-blast drying layer 8 and communicate with cooling air output case 4, it is provided with first heat preservation tempering layer cooling air collection horn shape pipe 16 and cooling air output case 4 intercommunication in the tempering layer 7 to preserve heat and preserve moisture.

In a more preferred embodiment, a supplementary hot air duct 17 is further included, and the supplementary hot air duct 17 is communicated with the warm and humid hot air transfer box 3.

It should be noted that the staged drying equipment provided by the present application further includes a material collecting hopper 18, a lifting machine 19, an upper grain conveying device 20 and a material homogenizing and distributing device 21; the material collecting hopper 18 is arranged at the lowest part of the equipment and is used for receiving the dried material and communicated with the lower end of the lifting machine 19 through a conveying device; the feeding end of the upper grain conveying device 20 is communicated with the upper end of the hoisting machine 19; the material homogenizing and scattering device 21 is arranged at the discharge end of the upper grain conveying device 20 and used for uniformly distributing materials in the sectional drying equipment.

The movement process of hot wind:

hot air enters the hot air input box 2 through the hot air inlet pipe 22 and the hot air blower 1, then horizontally enters the core drying layer hot air input horn-shaped pipe 12, passes through a grain layer in various moving directions, transfers heat to grains, takes away water vapor and dust at medium wind speed, enters the core drying layer cooling air collection horn-shaped pipe 13, enters the temperature and humidity hot air transfer box 3 from an air outlet of the core drying layer cooling air collection horn-shaped pipe, and is changed into moisture-containing hot air with reduced temperature. Warm and humid hot air goes upward all the way, and is mixed with hot air from the supplementary hot air pipe 17, the temperature is raised, then most of the hot air horizontally enters the wet hot air drying layer-containing hot air input horn-shaped pipe 14 of the wet hot air drying layer 8, passes through the grain layer in various moving directions, transfers heat to the surface of the grain particles, and transfers the heat to the inside, the temperature inside the grain particles is raised, the speed of the outward migration of the internal moisture is accelerated, then the water vapor and dust are taken away at medium wind speed, the hot air enters the wet hot air drying layer-containing cooling air collection horn-shaped pipe 15 of the wet hot air drying layer 8, enters the cooling air output box 4 from the air outlet, passes through the transition air pipe 23 and the air draft equipment 5, enters the tail air treatment.

In addition, a small part of warm and humid hot air goes upwards all the way, enters the buffer layer 6 through the first warm and humid hot air branch pipe 11, then vertically goes downwards, enters the heat preservation and moisture preservation tempering layer 7, transfers heat to grains, enters the first heat preservation and moisture preservation tempering layer cooling air collecting horn-shaped pipe 16 below the heat preservation and moisture preservation tempering layer 7 at a low air speed, enters the cooling air output box 4 from an air outlet of the horn-shaped pipe, passes through the cross air pipe 23 and the air draft equipment 5, enters the tail air treatment equipment and is exhausted into the atmosphere.

The movement process of the grains is as follows:

the grain is lifted by a lifter 19, is conveyed to the top of the tower by an upper grain conveying device 20, is scattered by a material-homogenizing and scattering device 21, enters the buffer layer 6 and the heat-preserving and moisture-preserving tempering layer 7, is contacted with warm and wet hot air flowing downwards, and the heat of the wet hot air is transferred to the grain. Because of the humidity of moist hot-blast humidity is greater than the humidity on cereal granule surface, so the moisture on cereal granule surface does not basically discharge for warm moist hot-blast, but moist hot-blast heat can be passed to the cereal surface, and then inside the transmission cereal granule, rise inside temperature for the outside speed of migrating of inside moisture.

The grains continuously descend to enter the wet and hot air drying layer 8 and contact with the intermediate-speed warm and wet hot air flowing out of the hot air input horn-shaped pipe 14 of the wet and hot air drying layer, the heat of the wet hot air is transmitted to the inside from the surfaces of the grains, the internal and external temperatures of the grains are increased, and the outward migration of the internal moisture is accelerated. Because the humidity of the wet hot air is close to that of the surfaces of the grain particles, the drainage capillary pores on the surfaces of the grain particles are in a state of large opening, so that the moisture in the grain particles is discharged outwards through the capillary pores on the surfaces, the moisture gradient inside and outside the grain particles is small, and the internal stress is small.

The grains continuously descend into the tempering layer 9, heat on the outer surfaces of the grains is further conducted to the inside, water inside the grains is transferred to the outside, tempering is carried out, and the grains are laid on the core drying layer below the grains.

The grains continuously descend into the core drying layer 10, and dry hot air blown out at a medium speed from the hot air input horn-shaped pipe 12 of the core drying layer passes through the grain layer in various moving directions to transfer heat to the grains. The moisture on the surface of the grain absorbs heat to raise the temperature, and the moisture turns into water vapor, and the heat absorbed on the surface of the grain continues to raise the temperature. After the hot air emits heat, water vapor and dust are taken away at a medium speed, enter the core drying layer cooling air collecting horn-shaped pipe 13 and enter the warm and humid hot air transfer box 3 from the air outlet of the horn-shaped pipe.

The grains continuously descend into the material distributing hopper 24, are discharged downwards through the discharging device 25, enter the material collecting hopper 18, are conveyed into the lifting machine 19 through the lower conveying device to finish primary drying, and are circularly dried for multiple times to reach the preset standard.

Example 2

As shown in fig. 3 and 4, a sectional drying device includes a hot air blower 1, a hot air input box 2, a warm and humid hot air transfer box 3, a cooling air output box 4, an air draft device 5, and a buffer layer 6, a heat preservation and moisture preservation tempering layer 7, a core drying layer 10, an intermediate tempering layer 9 and a humid hot air drying layer 8 which are arranged to run through from top to bottom, wherein the hot air blower 1 is communicated with the core drying layer 10 through the hot air input box 2, and the air draft device 5 is communicated with the humid hot air drying layer 8 through the cooling air output box 4; the hot air blower 1 and the air draft device 5 are arranged on the same side; one end of the core drying layer 10 far away from the hot air blower 1 is communicated with one end of the damp and hot air containing drying layer 8 far away from the air draft device 5 through the warm and damp hot air transfer box 3.

In a preferred embodiment, the sectional drying device further comprises a second warm and humid hot air branch pipe 26 and a warm and humid hot air input angular pipe 27 of a heat preservation and moisture preservation tempering layer, the buffer layer 6 is communicated with the warm and humid hot air transfer box 3 through the second warm and humid hot air branch pipe 26, and the warm and moisture preservation tempering layer hot air input angular pipe 27 is arranged in the heat preservation and moisture preservation tempering layer 7 and is communicated with the hot air input box 2.

In another preferred embodiment, the sectional drying equipment is further provided with one or more groups of core drying layer hot air input angular pipes 12, core drying layer cooling air collection angular pipes 13, wet hot air containing drying layer hot air input angular pipes 14, wet hot air containing drying layer cooling air collection angular pipes 15 and second heat-preservation and moisture-preservation tempering layer hot air input angular pipes 27; hot-blast input horn shape pipe 12 of core drying layer sets up in core drying layer 10 and communicates with hot-blast input case 2, core drying layer cooling air is collected horn shape pipe 13 and is set up in core drying layer 10 and communicate with warm and humid hot-blast transfer case 3, contain hot-blast input horn shape pipe 14 of humid hot-blast drying layer and set up in containing humid hot-blast drying layer 8 and communicate with warm and humid hot-blast transfer case 3, contain humid hot-blast drying layer cooling air and collect horn shape pipe 15 and set up in containing humid hot-blast drying layer 8 and communicate with cooling air output case 4.

The movement process of hot wind:

hot air enters the hot air input box 2 through the hot air inlet pipe 22 and the hot air blower 1, enters the core drying layer hot air input horn-shaped pipe 12 in most horizontal directions, passes through a grain layer in multiple moving directions, transfers heat to grains, takes away water vapor and dust at medium wind speed, enters the core drying layer cooling air collection horn-shaped pipe 13, enters the temperature and humidity hot air transfer box 3 from an air outlet of the core drying layer cooling air collection horn-shaped pipe, and is changed into moisture-containing hot air with reduced temperature.

And a small part of hot air flows upwards all the way, passes through the heat-preservation and moisture-preservation tempering layer hot air input horn-shaped pipe 27, enters the heat-preservation and moisture-preservation tempering layer 7 at a low air speed, flows upwards, transfers heat to grains, enters the buffer layer 6, then vertically downwards passes through the second warm and wet hot air branch pipe 26, enters the warm and wet hot air transfer box 3, and is mixed with warm and wet hot air from the core drying layer 10.

Warm and humid hot air goes downward all the way, mixes with hot air from the supplementary hot-blast main 17, the rising temperature, then get into the hot-blast input horn-shaped pipe 14 that contains the hot-air drying layer of wet heat, pass the cereal layer with multiple directions of motion, pass the heat to the cereal granule surface, and transmit to inside, rise the inside temperature of cereal granule, accelerate the outside migration speed of inside moisture, then take away steam and dust with medium wind speed, get into containing hot-air drying layer cooling air and collect horn-shaped pipe 15, get into cooling air output box 4 from its air outlet, cross tuber pipe 23, updraft ventilator 5, get into tail air treatment facility, the atmosphere discharges.

The movement process of the grains is as follows:

the grain is lifted by a lifter 19, sent to the top of the tower by an upper grain conveying device 20, enters the buffer layer 6 and the heat-preservation and moisture-preservation tempering layer 7 by a material-homogenizing and scattering device 21, and contacts with the hot air flowing downwards, and the heat of the hot air is transferred to the grain. Because of the low flow velocity of the hot air, the moisture on the surface of the grain particles is rarely discharged to the hot air, but the heat of the hot air is transferred to the surface of the grain particles and further transferred to the inside of the grain particles, so that the internal temperature is increased, and the outward migration velocity of the internal moisture is accelerated.

The grains continuously descend into the tempering layer 9, heat on the outer surfaces of the grains is further conducted to the inside, water inside the grains is transferred to the outside, tempering is carried out, and the grains are dried on the wet hot air containing drying layer 8 below the grains of the grains to be paved.

At the beginning and end of grain harvesting, it may occur that the harvested grain is not sufficient to fill the dryer. We take this into account in the construction that the hot air drying can be switched on as long as the grain load reaches the top of the intermediate tempering layer 9, i.e. there is a certain margin to compensate for the shrinkage after the grain drying.

In the sectional drying equipment provided in examples 1 and 2, the temperature of hot air and the temperature of grains are controlled as follows:

1) when drying the rice commodity, the temperature of the hot air is controlled to be 45-55 ℃, and the temperature of the rice is controlled to be below 42 ℃. When drying the rice seeds, the temperature of the hot air is controlled to be 35-45 ℃, and the temperature of the rice is controlled to be below 37 ℃.

2) When drying wheat commercial grains, the temperature of hot air is controlled at 50-60 ℃, and the temperature of wheat is controlled below 47 ℃. When drying wheat seeds, the hot air is controlled at 40-50 ℃ and the wheat temperature is controlled below 42 ℃.

3) When the corn feed grain is dried, the temperature of hot air is controlled to be 80-100 ℃, and the temperature of corn is controlled to be below 80 ℃. When the commercial corn is dried, the temperature of hot air is controlled to be 60-80 ℃, and the temperature of corn is controlled to be below 53 ℃. When the corn seeds are dried, the hot air is controlled to be 40-50 ℃, and the wheat temperature is controlled to be below 42 ℃.

Example 3

As shown in fig. 5 and 6, a sectional drying device includes a hot air blower 1, a hot air input box 2, a warm and humid hot air transfer box 3, a cooling air output box 4, an air draft device 5, and a buffer layer 6, a heat preservation and moisture preservation tempering layer 7, a humid hot air drying layer 8, a middle tempering layer 9 and a core drying layer 10 which are arranged to run through from top to bottom, wherein the hot air blower 1 is communicated with the core drying layer 10 through the hot air input box 2, and the air draft device 5 is communicated with the humid hot air drying layer 8 through the cooling air output box 4; the hot air blower 1 and the air draft device 5 are arranged on the same side; one end of the core drying layer 10 far away from the hot air blower 1 is communicated with one end of the damp and hot air containing drying layer 8 far away from the air draft device 5 through the warm and damp hot air transfer box 3. A first insulating and moisturizing tempering layer cooling air collecting horn-shaped pipe 16 is arranged in the insulating and moisturizing tempering layer 7 and is communicated with the cooling air output box 4.

The sectional drying equipment also comprises a tempering hot air branch pipe 28, a tempering hot air input box 29, a first tempering hot air input horn-shaped pipe 30, a first booster fan 31, a hot air supplement box 32, an air adjusting device 33, an external hot air pipe 34, a hot air supplement even air pipe 35, an internal hot air supplement pipe 36 and a first return pipe 54.

The first tempering hot air input angular pipe 30 is arranged in the heat preservation and moisture preservation tempering layer 7 and is communicated with the tempering hot air input box 29, and the tempering hot air transfer box 3 is communicated with the tempering hot air input box 29 through a tempering hot air branch pipe 28; the first booster fan 31 is provided on the tempering hot air branch pipe 28. The first tempering hot air input angular pipe 30 divides the heat preservation and moisture preservation tempering layer 7 into an upper heat preservation and moisture preservation tempering layer 37, a tempering hot air input layer 38 and a lower heat preservation and moisture preservation tempering layer 39. The first return pipe 54 communicates the buffer layer 6 and the cooling wind delivery box 4.

The middle tempering layer 9 is communicated with the hot air input box 2 through a hot air supplement box 32, and the air adjusting device 33 is arranged between the hot air supplement box 32 and the hot air input box 2. The external hot air pipe 34 is arranged on the outer wall of the warm and humid hot air transfer box 3 and is communicated with the supplementary hot air homogenizing pipe 35, the internal hot air supplementary pipe 36 is arranged in the middle tempering layer 9, one end of the internal hot air supplementary pipe 36 is communicated with the hot air supplementary box 32, and the other end of the internal hot air supplementary pipe 36 is communicated with the supplementary hot air homogenizing pipe 35.

The sectional drying equipment is also provided with one or more groups of core drying layer hot air input angular pipes 12, core drying layer cooling air collection angular pipes 13, wet hot air containing drying layer hot air input angular pipes 14, wet hot air containing drying layer cooling air collection angular pipes 15 and first heat-preserving and moisture-preserving tempering layer cooling air collection angular pipes 16; hot-blast input horn shape pipe 12 of core drying layer sets up in core drying layer 10 and communicates with hot-blast input box 2, core drying layer cooling air is collected horn shape pipe 13 and is set up in core drying layer 10 and communicate with warm and humid hot-blast transfer case 3, contain hot-blast input horn shape pipe 14 of hot-blast input of humid hot-blast drying layer and set up in containing humid hot-blast drying layer 8 and communicate with warm and humid hot-blast transfer case 3, contain humid hot-blast drying layer cooling air and collect horn shape pipe 15 and set up in containing humid hot-blast drying layer 8 and communicate with cooling air output case 4, it is provided with first heat preservation tempering layer cooling air collection horn shape pipe 16 and cooling air output case 4 intercommunication in the tempering layer 7 to preserve heat and preserve moisture.

The movement process of hot wind:

hot air enters the hot air input box 2 through the hot air inlet pipe 22 and the hot air blower 1, and then is divided into two paths: the hot air which enters the core drying layer in most horizontal direction enters the horn-shaped pipe 12, passes through the grain layer in various moving directions, transfers heat to grains, takes away water vapor and dust at medium wind speed, enters the core drying layer cooling air collecting horn-shaped pipe 13, enters the warm and humid hot air transfer box 3 from the air outlet of the core drying layer cooling air collecting horn-shaped pipe, and is changed into moisture-containing hot air with reduced temperature. A small part of hot air enters a supplementary hot air homogenizing pipe 35 through an air adjusting device 33, a hot air supplementary box 32 and a built-in hot air supplementary pipe 36. Or the other hot air enters the supplementary hot air uniform air pipe 35 through the external hot air pipe 34. Warm and humid hot air moves upward all the way in warm and humid hot air transfer case 3, mixes with the hot-blast of coming from replenishing the even tuber pipe 35 of hot-blast, rise the temperature, then most level gets into contains wet hot air drying layer hot-blast input horn-shaped pipe 14, pass the cereal layer with multiple direction of motion, pass the heat to the cereal granule surface, and transmit to inside, rise the inside temperature of cereal granule, accelerate the outside migration speed of inside moisture, then take away steam and dust with medium wind speed, get into and contain wet hot air drying layer cooling air collection horn-shaped pipe 15, get into cooling air output case 4 from its air outlet, cross tuber pipe 23, air drafting equipment 5, get into tail air treatment facility, the atmosphere of discharging.

In addition, a small part of warm and humid hot air flows upwards all the way, enters grains in the slow hot air input layer 38 through the slow hot air branch pipe 28, the first booster fan 31, the slow hot air input box 29 and the first slow hot air input horn-shaped pipe 30, then flows into the lower heat-preservation and moisture-preservation slow-heating layer 39 with a low wind speed, transfers heat to the grains, continues to flow downwards into the first heat-preservation and moisture-preservation slow-heating layer cooling air collection horn-shaped pipe 16, enters the cooling air output box 4 from an air outlet of the cooling air collection horn-shaped pipe, passes through the transition air pipe 23 and the air draft equipment 5, enters tail air treatment equipment, and is exhausted into the atmosphere. The other part vertically upwards enters the upper heat-preservation and moisture-preservation tempering layer 37 at a low wind speed, transfers heat to grains, continues upwards, enters the cooling air output box 4 through the buffer layer 6 and the first return pipe 54, passes through the transition air pipe 23 and the air draft device 5, enters the tail air treatment device, and is exhausted into the atmosphere.

The movement process of the grains is as follows:

the grain is lifted by the lifter 19, is conveyed to the top of the tower by the upper grain conveying device 20, enters the upper heat-preservation and moisture-preservation tempering layer 37 through the material homogenizing and scattering device 21 and the buffer layer 6, is contacted with the warm and wet hot air flowing upwards, and the heat of the warm and wet hot air is transferred to the grain. Because of the humidity of warm and humid hot-blast humidity is greater than the humidity on cereal granule surface, the moisture on cereal granule surface gives warm and humid hot-blast very few, but warm and humid hot-blast heat can be passed to the cereal surface, and then inside the transmission cereal granule, the inside temperature of rising for the outside speed of migrating of inside moisture. The water content of the grain particles is slightly reduced after passing through the upper heat-preservation moisture-preservation tempering layer 37.

The grains continuously descend into the tempering hot air input layer 38 and the lower heat-preservation and moisture-preservation tempering layer 39 to be contacted with the downward flowing warm and wet hot air, and the heat of the warm and wet hot air is transferred to the grains. Because of the humidity of warm and humid hot-blast humidity is greater than the humidity on cereal granule surface, so the moisture on cereal granule surface is arranged for warm and humid hot-blast very little, but warm and humid hot-blast heat can be passed to the cereal surface, and then inside the transfer cereal granule, rise inside temperature for the outside speed of migrating of inside moisture. The water content of the grain particles is slightly reduced after passing through the tempering hot air input layer 38 and the lower heat-preservation moisture-preservation tempering layer 39.

The grains continuously descend to enter the wet and hot air drying layer 8 and contact with the intermediate-speed warm and wet hot air flowing out of the hot air input horn-shaped pipe 14 of the wet and hot air drying layer, the heat of the wet hot air is transmitted to the inside from the surfaces of the grains, the internal and external temperatures of the grains are increased, and the outward migration of the internal moisture is accelerated. Because the humidity of the wet hot air is close to that of the surfaces of the grain particles, the drainage capillary pores on the surfaces of the grain particles are in a state of large opening, so that the moisture in the grain particles is discharged outwards through the capillary pores on the surfaces, the moisture content of the grain particles is reduced, the moisture gradient inside and outside the grain particles is small, and the internal stress is small.

The grains continue to descend into the middle tempering layer 9, heat on the outer surfaces of the grains is further conducted to the inside, water inside the grains is transferred to the outside, tempering is carried out, and the grains are laid on the core drying layer 10 below the grains.

The grains continuously descend into the core drying layer 10, and dry hot air blown out at a medium speed from the hot air input horn-shaped pipe 12 of the core drying layer passes through the grain layer in various moving directions to transfer heat to the grains. The moisture on the surface of the grain particles absorbs heat to raise the temperature, and the moisture is changed into water vapor which is taken away by the medium-speed hot air, so that the moisture content of the grain particles is reduced; the heat absorbed by the grain surface continues to raise the temperature and is transferred internally.

Example 4

As shown in fig. 7 and 8, a sectional drying device includes a hot air blower 1, a hot air input box 2, a warm and humid hot air transfer box 3, a cooling air output box 4, an air draft device 5, and a buffer layer 6, a heat preservation and moisture preservation tempering layer 7, a core drying layer 10, an intermediate tempering layer 9 and a humid hot air drying layer 8 which are arranged to run through from top to bottom, wherein the hot air blower 1 is communicated with the core drying layer 10 through the hot air input box 2, and the air draft device 5 is communicated with the humid hot air drying layer 8 through the cooling air output box 4; the hot air blower 1 and the air draft device 5 are arranged on the same side; one end of the core drying layer 10 far away from the hot air blower 1 is communicated with one end of the damp and hot air containing drying layer 8 far away from the air draft device 5 through the warm and damp hot air transfer box 3.

In addition, the sectional drying equipment also comprises a hot air supplementing box 32, an air adjusting device 33, an external hot air pipe 34, a hot air supplementing and equalizing pipe 35, an internal hot air supplementing pipe 36, a hot air branch pipe 40, a second booster fan 41, a hot air branch air box 42, a second tempering hot air input angular pipe 43 and a second heat-preservation and moisture-preservation tempering layer cooling air collecting angular pipe 44.

The second tempering hot air input angular pipe 43 is arranged on the heat preservation and moisture preservation tempering layer 7 and communicated with the hot air branch air box 42, the second heat preservation and moisture preservation tempering layer cooling air collection angular pipe 44 is arranged on the heat preservation and moisture preservation tempering layer 7 and communicated with the warm and moisture hot air transfer box 3, the hot air branch air box 42 is communicated with the hot air input box 2 through the hot air branch pipe 40, and the second booster fan 41 is arranged on the hot air branch pipe 40. The second tempering hot air input angular pipe 43 divides the heat preservation and moisture preservation tempering layer 7 into an upper heat preservation and moisture preservation tempering layer 37, a tempering hot air input layer 38 and a lower heat preservation and moisture preservation tempering layer 39.

The sectional drying equipment is also provided with one or more groups of core drying layer hot air input angular pipes 12, core drying layer cooling air collection angular pipes 13, wet hot air containing drying layer hot air input angular pipes 14, wet hot air containing drying layer cooling air collection angular pipes 15 and second heat-preservation and moisture-preservation tempering layer cooling air collection angular pipes 44; hot-blast input horn shape pipe 12 of core drying layer sets up in core drying layer 10 and communicates with hot-blast input box 2, core drying layer cooling air is collected horn shape pipe 13 and is set up in core drying layer 10 and communicate with warm and humid hot-blast transfer case 3, contain hot-blast input horn shape pipe 14 of hot-blast input of humid hot-blast drying layer and set up in containing humid hot-blast drying layer 8 and communicate with warm and humid hot-blast transfer case 3, contain humid hot-blast drying layer cooling air and collect horn shape pipe 15 and set up in containing humid hot-blast drying layer 8 and communicate with cooling air output case 4, it is provided with second heat preservation tempering layer cooling air in the tempering layer 7 and collects horn shape pipe 44 and warm and humid hot-blast transfer case 3 intercommunication to keep warm and moisturize.

The movement process of hot wind:

hot air enters the hot air input box 2 through the hot air inlet pipe 22 and the hot air blower 1, and then is divided into three paths: the hot air which enters the core drying layer in most horizontal direction enters the horn-shaped pipe 12, passes through the grain layer in various moving directions, transfers heat to grains, takes away water vapor and dust at medium wind speed, enters the core drying layer cooling air collecting horn-shaped pipe 13, enters the warm and humid hot air transfer box 3 from the air outlet of the core drying layer cooling air collecting horn-shaped pipe, and is changed into moisture-containing hot air with reduced temperature. A small part of hot air enters a supplementary hot air homogenizing pipe 35 through an air adjusting device 33, a hot air supplementary box 32 and a built-in hot air supplementary pipe 36. Or the other hot air enters the supplementary hot air uniform air pipe 35 through the external hot air pipe 34. Warm and humid hot air moves downwards all the way in warm and humid hot air transfer case 3, mixes with the hot-blast of coming from replenishing the even tuber pipe 35 of hot-blast, rise the temperature, then most level gets into contains wet hot air drying layer hot-blast input horn-shaped pipe 14, pass the cereal layer with multiple direction of motion, pass the heat to cereal granule surface, and internal transfer, rise the inside temperature of cereal granule, accelerate the outside migration speed of inside moisture, then take away steam and dust with medium wind speed, get into and contain wet hot air drying layer cooling air collection horn-shaped pipe 15, get into cooling air output case 4 from its air outlet, cross tuber pipe 23, air drafting equipment 5, get into tail air treatment facility, the atmosphere of discharging.

And the other small part of hot air flows upwards all the way, enters grains in the tempering hot air input layer 38 through a hot air branch pipe 40, a second booster fan 41, a hot air branch air box 42 and a second tempering hot air input horn-shaped pipe 43, then flows into the lower heat-preservation and moisture-preservation tempering layer 39 at a low air speed, transfers heat to the grains, continues to flow downwards into a second heat-preservation and moisture-preservation tempering layer cooling air collection horn-shaped pipe 44, and enters the warm-humid hot air transfer box 3 from an air outlet of the second heat-preservation and moisture-preservation tempering layer. The other part vertically upwards enters the upper heat-preservation and moisture-preservation tempering layer 37 at a low wind speed, transfers heat to grains, continues upwards, passes through the upper grain conveying device 20, the middle seat and the cylinder of the elevator 19, the second return pipe 55, the material collecting hopper 18, the discharging device 25, the material diversion hopper 24, the core drying layer cooling air collecting horn-shaped pipe 13 and the cooling air output box 4, passes through the cross air pipe 23 and the air extracting device 5, enters the tail air processing device, and is discharged into the atmosphere.

The movement process of the grains is as follows:

the grain is lifted by a lifter 19, conveyed to the top of the tower by an upper grain conveying device 20, distributed by a material distribution device 21, enters an upper heat-preservation and moisture-preservation tempering layer 37 through a buffer layer 6, and is contacted with the hot air flowing upwards, and the heat of the hot air is transferred to the grain. Because of the low flow velocity of the hot air, the moisture on the surface of the grain particles is rarely discharged to the hot air, but the heat of the hot air is transferred to the surface of the grain particles and further transferred to the inside of the grain particles, so that the internal temperature is increased, and the outward migration velocity of the internal moisture is accelerated. The water content of the grain particles is slightly reduced after passing through the upper heat-preservation moisture-preservation tempering layer 37.

The grains continuously descend into the tempering hot air input layer 38 and the lower heat-preservation and moisture-preservation tempering layer 39 to be contacted with the hot air flowing downwards, and the heat of the hot air is transferred to the grains. Because of the low flow velocity of the hot air, the moisture on the surface of the grain particles is rarely discharged to the hot air, but the heat of the hot air is transferred to the surface of the grain particles and further transferred to the inside of the grain particles, so that the internal temperature is increased, and the outward migration velocity of the internal moisture is accelerated. The water content of the grain particles is slightly reduced after passing through the tempering hot air input layer 38 and the lower heat-preservation moisture-preservation tempering layer 39.

The grains continuously descend into the tempering layer 9, heat on the outer surfaces of the grains is further conducted to the inside, water inside the grains is transferred to the outside, tempering is carried out, and the grains are laid on the wet hot air containing drying layer 8 below the grains.

At the beginning and end of grain harvesting, it may occur that the harvested grain is not sufficient to fill the dryer. In the structure, the situation is considered, and as long as the grain loading reaches the top of the middle tempering layer 9, namely a certain margin is used for compensating the shrinkage after grain drying, the air adjusting device 33 between the hot air input box 2 and the hot air supplementing box 32 is closed, and then the hot air drying can be conducted.

In an alternative embodiment, a branch pipe may be provided to communicate the buffer layer 6 with the warm and humid hot air transfer box 3, for directly guiding the humid hot air in the buffer layer 6 to the warm and humid hot air transfer box 3.

Control of the hot air temperature and grain temperature of the staged drying devices provided in examples 3 and 4:

Example 5

As shown in fig. 9 and 10, the difference from example 3 is that the core drying layer 10 and the moist-heat-containing air drying layer 8 of the staged drying apparatus are not provided with angular pipes, but the core drying layer 10 is provided with a first sieve plate 45 and the moist-heat-containing air drying layer 8 is provided with a second sieve plate 46, the first sieve plate 45 forms a core drying layer hot air duct 47, a first grain channel 48 and a core drying layer cooling air duct 49 which are alternately arranged in the core drying layer 10, and the second sieve plate 46 forms a moist-heat-containing air drying layer hot air duct 50, a second grain channel 51 and a moist-heat-containing air drying layer cooling air duct 52 which are alternately arranged in the moist-heat-containing air drying layer 8; the core drying layer hot air duct 47 is communicated with the hot air input box 2, the core drying layer cooling air duct 49 is communicated with the warm and humid hot air transfer box 3, the humid hot air containing drying layer hot air duct 50 is communicated with the warm and humid hot air transfer box 3, and the humid hot air containing drying layer cooling air duct 52 is communicated with the cooling air output box 4.

The middle tempering layer 9 is not provided with the built-in hot air supplementing pipe 36, but is provided with a built-in hot air channel 53, one end of the built-in hot air channel 53 is communicated with the hot air supplementing box 32, and the other end is communicated with the warm and humid hot air transfer box 3. Meanwhile, the hot air supplementing pipe 17 is used for replacing an external hot air pipe 34 to supplement hot air for the warm and humid hot air transferring box 3.

It should be noted that the supplementary hot air duct 17 and the external hot air duct 34 are both used for providing external heat sources and can be used alternatively.

Example 6

As shown in fig. 11 and 12, the difference from the embodiment 4 is that the core drying layer 10 and the moist-heat-containing air drying layer 8 of the staged drying apparatus are not provided with angular pipes, but the core drying layer 10 is provided with a first sieve plate 45 and the moist-heat-containing air drying layer 8 is provided with a second sieve plate 46, the first sieve plate 45 forms a core drying layer hot air duct 47, a first grain channel 48 and a core drying layer cooling air duct 49 which are alternately arranged in the core drying layer 10, and the second sieve plate 46 forms a moist-heat-containing air drying layer hot air duct 50, a second grain channel 51 and a moist-heat-containing air drying layer cooling air duct 52 which are alternately arranged in the moist-heat-containing air drying layer 8; the core drying layer hot air duct 47 is communicated with the hot air input box 2, the core drying layer cooling air duct 49 is communicated with the warm and humid hot air transfer box 3, the humid hot air containing drying layer hot air duct 50 is communicated with the warm and humid hot air transfer box 3, and the humid hot air containing drying layer cooling air duct 52 is communicated with the cooling air output box 4.

The middle tempering layer 9 is not provided with the built-in hot air supplementing pipe 36, but is provided with a built-in hot air channel 53, one end of the built-in hot air channel 53 is communicated with the hot air supplementing box 32, and the other end is communicated with the warm and humid hot air transfer box 3. Meanwhile, a supplementary hot air pipe 17 is used for replacing a 34-external source hot air pipe to supplement hot air for the warm and humid hot air transfer box 3.

In each of examples 5 and 6, a hot air passage, a grain passage, and a cool air passage are formed by using a sieve plate instead of the hot air supply angled duct and the cool air collection angled duct used in examples 3 and 4, respectively.

According to the sectional drying equipment, the arrangement of the existing drying equipment for the drying layer and the tempering layer is changed, waste heat and moisture can be better utilized, and the quality of grains is not reduced under the condition of ensuring high drying efficiency; the increase value of the waist-popping rate, the increase value of the crack rate and the increase value of the crushing rate of the dried grains are low, so that the germination rate is not reduced; the taste value, the appearance, the processing performance and other qualities are better.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. The sectional drying equipment is characterized by comprising a hot air blower, a hot air input box, a warm and humid hot air transfer box, a cooling air output box, air draft equipment, a buffer layer, a heat preservation and moisture preservation tempering layer, a core drying layer, a middle tempering layer and a humid hot air drying layer, wherein the buffer layer, the heat preservation and moisture preservation tempering layer, the core drying layer, the middle tempering layer and the humid hot air drying layer are arranged in a run-through manner;

2. The staged drying apparatus as claimed in claim 1, further comprising a core drying layer hot air input angled tube, a core drying layer cooling air collection angled tube, a hot air input angled tube containing moist hot air drying layer, and a cooling air collection angled tube containing moist hot air drying layer;

3. The staged drying apparatus as claimed in claim 1, further comprising a first sieve plate and a second sieve plate, wherein the first sieve plate forms a core drying layer hot air passage, a first grain passage and a core drying layer cooling air passage alternately arranged in the core drying layer, and the second sieve plate forms a moist heat-containing air drying layer hot air passage, a second grain passage and a moist heat-containing air drying layer cooling air passage alternately arranged in the moist heat-containing air drying layer;

4. The staged drying device according to claim 2 or 3, wherein the buffer layer, the thermal and moisture insulating tempering layer, the moisture containing hot air drying layer, the intermediate tempering layer and the core drying layer are sequentially arranged from top to bottom;

5. The staged drying apparatus of claim 4, further comprising a first warm and humid hot air branch pipe, wherein the warm and humid hot air transfer box is in communication with the buffer layer through the first warm and humid hot air branch pipe.

6. The sectional drying equipment according to claim 4, further comprising a tempering hot air branch pipe, a tempering hot air input box, a first tempering hot air input angular pipe and a first booster fan, wherein the first tempering hot air input angular pipe is arranged in the heat-preservation and moisture-preservation tempering layer and is communicated with the tempering hot air input box, and the heat-preservation and moisture-preservation hot air transfer box is communicated with the tempering hot air input box through the tempering hot air branch pipe; the first booster fan is arranged on the tempering hot air branch pipe.

7. The staged drying apparatus of claim 6, further comprising a first return duct communicating the buffer layer and the cooling air outlet box.

8. The staged drying device of claim 2 or 3, wherein the buffer layer, the tempering layer, the core drying layer, the intermediate tempering layer, and the moisture-containing hot air drying layer are sequentially disposed from top to bottom.

9. The sectional drying equipment according to claim 8, further comprising a heat-insulating and moisture-preserving tempering layer hot air input angular pipe and a second warm and moisture hot air branch pipe, wherein the heat-insulating and moisture-preserving tempering layer hot air input angular pipe is arranged in the heat-insulating and moisture-preserving tempering layer and is communicated with the hot air input box, and the second warm and moisture hot air branch pipe is communicated with the buffer layer and the warm and moisture hot air transfer box.

10. The sectional drying equipment according to claim 8, further comprising a hot air branch pipe, a second booster fan, a hot air branch bellows, a second tempering hot air input angular pipe and a second heat and moisture preservation tempering layer cooling air collection angular pipe, wherein the second tempering hot air input angular pipe is arranged on the heat and moisture preservation tempering layer and communicated with the hot air branch bellows, the second heat and moisture preservation tempering layer cooling air collection angular pipe is arranged on the heat and moisture preservation tempering layer and communicated with the heat and moisture hot air transfer box, the hot air branch bellows is communicated with the hot air input box through the hot air branch pipe, and the second booster fan is arranged on the hot air branch pipe.

11. The sectional drying equipment according to claim 1, further comprising a hot air supply box and an air adjusting device, wherein the warm and humid hot air transfer box is communicated with the hot air input box through the hot air supply box, and the air adjusting device is arranged between the hot air supply box and the hot air input box.

12. The staged drying device according to claim 11, further comprising a supplementary hot air homogenizing pipe and a built-in hot air supplementing pipe, wherein the built-in hot air supplementing pipe is arranged in the middle tempering layer, the supplementary hot air homogenizing pipe is arranged in the warm and humid hot air transferring box, one end of the built-in hot air supplementing pipe is communicated with the hot air supplementing box, and the other end of the built-in hot air supplementing pipe is communicated with the supplementary hot air homogenizing pipe.

13. The staged drying apparatus as claimed in claim 12, further comprising an external hot air duct disposed on the outer wall of the warm and humid hot air transfer box and communicating with the supplementary hot air homogenizing duct.

14. The staged drying device according to claim 11, wherein the middle tempering layer is provided with a built-in hot air channel, one end of the built-in hot air channel is communicated with the hot air supplementing box, and the other end of the built-in hot air channel is communicated with the warm and humid hot air transferring box.

15. The staged drying apparatus of claim 1, further comprising a supplemental hot air duct in communication with the warm and humid hot air transfer box.