CN108413744A - Peanut breeding full automatic drying machine - Google Patents

Abstract

The invention discloses a fully automatic dryer for peanut seeds, which comprises a box body, the lower part of which is fixedly connected with a partition, and the partition divides the box body into two airtight upper and lower chambers, on which a stirring device and Stirring trough, the stirring device stirs the peanut seeds in the trough, and ventilation holes are set on the partition plate corresponding to the trough; the first and second air outlets of the dual-temperature air supply device pass through the air inlet pipe and the lower chamber of the box Unicom; the top of the box is equipped with an exhaust pipe, and the exhaust pipe below the exhaust valve is connected to the warm air return pipe. The first air inlet Unicom. The invention realizes automatic control of peanut seed drying, has low labor intensity, high production efficiency, low operating cost, high drying efficiency, good drying quality, and improves the internal and external humidity of peanuts and the heating of peanut seeds on the top and bottom layers. The uniformity of the peanut seed shrinkage is relatively uniform, which improves the rehydration, germination rate and vitality of the peanut seed.

Description

Peanut seed automatic dryer

technical field

The invention belongs to the technical field of agricultural machinery, and in particular relates to a fully automatic dryer for peanut breeding.

Background technique

For peanuts used for seed breeding, the quality of drying will directly affect the viability of the next peanut seeds. Excessively high drying temperature when drying seeds on the concrete floor at noon on sunny days and excessively long storage time indoors on cloudy and rainy days can all reduce the germination potential of peanut seeds and the rate of rice yield in the field. When the existing peanut dryers are roasting, there is a common problem of uneven drying. First, the inside and outside of a single peanut are heated unevenly, causing the surface of the peanut to be scorched, and the inside of the peanut has not yet reached the drying requirements. The internal and external humidity of the peanut dryer is uneven; the second is the lack of a turning device, and the peanuts on the top layer and the bottom layer are heated unevenly; The effect of heating; some peanut dryers are equipped with conveyor belts, which can obtain the effect of uniform heating through a small amount of multiple feeds. However, the above-mentioned technical means are time-consuming and energy-consuming, and the effect is not significant. The fruit is easy to break and crack, so it is not suitable for drying devices such as drums. At the same time, the drying mode is single, the drying rate of airing is too slow, the drying rate of baking is too fast, and the drying rate is too fast or too slow, all of which will destroy the vitality of peanut seeds.

Contents of the invention

The object of the present invention is to provide a fully automatic dryer for peanut seeding aimed at the above-mentioned deficiencies in the prior art.

Technical scheme of the present invention is realized in the following manner:

Fully automatic dryer for peanut seeds, including a box body and an air supply device. The box body is a closed cuboid with one side open. The partition is fixed, and the partition divides the box into two closed upper and lower chambers. A stirring device and a storage tank are arranged on the partition. The stirring device stirs the peanut seeds in the storage tank, and the second support of the stirring device An online infrared moisture meter is installed; an air speed sensor and an air temperature sensor are installed under the partition, and ventilation holes are arranged on the partition corresponding to the storage tank; the air supply device is a dual-temperature air supply device, and the first and second outlets of the dual-temperature air supply device The air outlet communicates with the lower chamber of the box through the air inlet pipe; the top of the box is provided with an exhaust pipe, and the exhaust pipe is provided with an exhaust valve motor, and the output shaft of the exhaust valve motor is fixedly connected with the exhaust valve. The outer diameter of the exhaust pipe matches the inner diameter of the exhaust pipe; the exhaust pipe below the exhaust valve is connected to the warm air return pipe, and a dehumidification device is installed on the warm air return pipe, and the other end of the warm air return pipe is connected to the dual temperature supply The first air inlet of the wind device is connected; wind speed sensor, wind temperature sensor, online infrared moisture meter, exhaust valve motor, translation motor and stirring motor of the stirring device, exhaust valve motor, and air exchange plate motor of the dual-temperature air supply device And the controller of the air supply motor and the heating controller are electrically connected with the PLC control device respectively; the motor of the exhaust valve, the translation motor and the stirring motor of the stirring device, the motor of the exhaust valve, the motor of the air exchange plate of the dual temperature air supply device and the motor of the air supply The wind motor, the heating device and the PLC control device are electrically connected to the power supply respectively.

The diameter of the ventilation hole is 2-7mm.

The stirring device includes a first bracket and a second bracket fixedly connected to the partition plate. A reduction box is arranged on the first bracket. The light rod fixing seat, the light rod is fixed on the light rod fixing seat, the light rod is slidably connected with the sliding sleeve, the sliding sleeve is fixed on the sliding plate, the sliding plate is fixed on the horizontal plate, the end of the horizontal plate is fixed on the vertical plate, the lower end of the vertical plate The stirring shaft is connected by rotation, the stirring tube is fixedly connected to the stirring shaft, the stirring rod is detachably connected to the stirring tube, the stirring motor is installed at one end of the horizontal plate, the stirring motor is connected to the stirring shaft, and the passive synchronous wheel is connected to the second bracket for passive synchronization. The synchronous belt is rolled and connected on the active synchronous wheel and the active synchronous wheel, and the two ends of the synchronous belt are fixedly connected with the slide plate.

The stirring rod includes an elastic rod.

The elastic rods include rubber rods.

The surface of the rubber rod is provided with threads.

The end surface of the rubber rod is connected tangentially with the upper surface of the partition when the stirring tube rotates.

The dual-temperature air supply device includes a volute, a volute cover, an air exchange mechanism and an air supply device; the volute is sealed and connected to the volute cover, the bottom surface of the volute is fixedly connected with a base, and the volute is provided with a first air inlet , the second air inlet, the first air outlet and the second air outlet, the second air inlet communicates with natural air, the first air outlet is provided with a heating device and a heating device controller, and the heating device is electrically connected to the heating device controller; The air supply device is arranged at the air inlet of the volute; the air exchange mechanism is arranged between the air supply device and the first and second air outlets, and the air exchange mechanism is used to switch the air supply device leading to the first air outlet or the first air outlet respectively. The air duct of the air outlet; the air exchange mechanism includes an air exchange plate and an air exchange plate motor; one end of the air exchange plate is fixedly connected to the output shaft of the air exchange plate motor; the other end of the air exchange plate can pass through the air exchange plate motor The rotation is close to the convex point A or convex point B on the upper and lower inner walls of the volute; the orientation of the first air outlet and the second air outlet is the same.

The air supply device includes an air supply motor, and a turbine is fixedly connected to the output shaft of the air supply motor.

The present invention has the following advantages:

1. The dual-temperature air supply device is used to implement low-temperature and high-speed drying, high-wind temperature and high-speed drying, and low-wind temperature and low-speed drying to reduce energy consumption and improve drying efficiency and drying quality. , The shrinkage of peanut seeds is relatively uniform, which improves the rehydration, germination rate and vitality of peanut seeds.

2. The dual-temperature air supply device is used to implement the warm air circulation heating process. During the drying process, not only the sensible heat in the exhaust gas is recovered, but also the latent heat in the exhaust gas is recovered, which greatly improves the energy utilization rate, and the drying method Mild, close to natural drying, good drying quality, high production efficiency and low operating costs.

3. The dual-temperature air supply device is used to implement the ambient air temperature and low wind speed slowing process, so that the moisture inside the peanuts can be diffused to the surface, so that the center and surface moisture tend to be balanced, and then continue to dry, which improves the quality of peanut drying and reduces the Energy consumption is reduced, drying efficiency is improved, and the uniformity of humidity inside and outside the peanuts is improved.

4. The dynamic stirring bar of the stirring device stirs the peanut seeds being dried in the storage tank for many times, so that the peanut seeds on the top layer and the bottom layer are stirred and transposed multiple times, so that the peanut seeds on the top layer and the bottom layer are heated evenly, Moreover, the stirring rod adopts a rubber rod to prevent damage to the peanut seed shell during the stirring process, and the thread on the rubber rod increases the friction coefficient between the rubber rod and the peanut seed shell during the stirring process, further improving the stirring effect.

5. Storage at a temperature of 5-10°C and a relative humidity of 55%-65% can effectively guarantee the storage effect of peanut seeds.

6. The present invention is equipped with stirring and dual-temperature air supply devices, implements variable process drying, warm air circulation heating, and slow drying process, and realizes automatic control of peanut seed drying, low labor intensity, high production efficiency, and low operating costs , high drying efficiency, good drying quality, improve the internal and external humidity of peanuts and the uniformity of heating of the top and bottom peanut seeds, the shrinkage of peanut seeds is more uniform, and the rehydration, germination rate and vitality of peanut seeds are improved .

Description of drawings

Accompanying drawing 1 is the structural representation of the fully automatic drying machine for peanut breeding.

Accompanying drawing 2 is the structure schematic diagram of the stirring device of the automatic peanut seeding dryer.

Accompanying drawing 3 is the left view of accompanying drawing 2.

Accompanying drawing 4 is the top view of accompanying drawing 2.

Accompanying drawing 5 is the structural representation of the dual-temperature air supply device of the automatic peanut seeding dryer.

Accompanying drawing 6 is the top view of accompanying drawing 5.

In the figure: 1-dual temperature air supply device, 2-warm air return pipe, 3-exhaust valve, 4-exhaust valve motor, 5-exhaust pipe, 6-online infrared moisture meter, 7-cabinet, 8-stirring device, 9-PLC control device, 10-box door, 11-storage trough, 12-wind speed sensor, 13-wind temperature sensor, 14-ventilation hole, 15-baffle, 16-air inlet pipe, 17 -passive synchronous wheel, 18-second bracket, 19-light bar, 20-synchronous belt, 21-sliding sleeve, 22-skateboard, 23-first bracket, 24-active synchronous wheel, 25-reduction box, 26-translation Motor, 27-stirring motor, 28-vertical plate, 29-horizontal plate, 30-light rod holder, 31-stirring shaft, 32-stirring tube, 33-stirring rod, 34-volute, 35-turbine, 36- Air supply motor, 37-air exchange plate, 38-air exchange plate motor, 39-heating controller, 40-heating device, 41-first air outlet, 42-second air outlet, 43-base, 44-first Air inlet, 45-second air inlet, 46-volute cover, 47-dehumidifier.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Fig. 1-Fig. 6, the fully automatic drying machine for peanut seeds includes a box body 7 and an air supply device. The box body 7 is a closed cuboid with one side opening, and one side of the box body opening is rotated and connected to the box door 10. A PLC control device 9 is arranged on the box door 10; the bottom of the box body 7 is fixedly connected with a partition 15, and the partition 15 divides the box body 7 into two airtight upper and lower chambers, and the stirring device 8 and the filling material are arranged on the partition 7 Groove 11, stirring device 8 stirs the peanut seeds in the storage tank 11, and the second support 18 of the stirring device 8 is provided with an online infrared moisture meter 6; a wind speed sensor 12 and an air temperature sensor 13 are arranged below the partition plate 15, corresponding to the storage tank Ventilation holes 14 are set on the dividing plate 7 of 11; The lower chamber is connected; the top of the box body 7 is provided with an exhaust pipe 5, and an exhaust valve motor 4 is arranged on the exhaust pipe 5. The output shaft of the exhaust valve motor 4 is fixedly connected with the exhaust valve 3, and the outer surface The diameter matches the inner diameter of the exhaust pipe 5; the exhaust pipe 5 below the exhaust valve 3 communicates with the warm air return pipe 2, and the warm air return pipe 2 is provided with a dehumidifier 47, and the other part of the warm air return pipe 2 One end communicates with the first air inlet 44 of the dual-temperature air supply device 1; the wind speed sensor 12, the wind temperature sensor 13, the online infrared moisture meter 6, the exhaust valve motor 4, the translation motor 26 and the stirring motor 27 of the stirring device and the exhaust air The valve motor 4, the air exchange plate motor 38 of the dual temperature air supply device and the controller and the heating controller 39 of the air supply motor 36 are electrically connected with the PLC control device 9 respectively; the exhaust valve motor 4, the translation motor 26 of the stirring device and The stirring motor 27, the exhaust valve motor 4, the air exchange plate motor 38 of the dual-temperature air supply device, the air supply motor 36, the heating device 40, and the PLC control device 9 are electrically connected to the power supply respectively.

The diameter of the ventilation hole 14 is 2-7mm.

Described agitating device 8 comprises the first support 23, the second support 18 that is affixed on the dividing plate 15, and the reduction box 25 is set on the first support 23, and the reduction box 25 is connected with translational motor 26, driving synchronous wheel 24 drive connections respectively, the second A bracket 23 and a second bracket 18 are fixedly connected to the light bar fixing seat 30, and the light bar fixing seat 30 is fixedly connected to the light bar 19, and the light bar 19 is slidably connected to the sliding sleeve 21, and the sliding sleeve 21 is fixedly connected to the slide plate 22, and the slide plate 22 The top is fixed to the horizontal plate 29, the end of the horizontal plate 29 is fixed to the vertical plate 28, the lower end of the vertical plate 28 is rotatably connected to the stirring shaft 31, the stirring tube 32 is fixed to the stirring shaft 31, and the stirring rod 33 is detachably connected to the stirring tube 32. One end of the horizontal plate 29 is provided with a stirring motor 27, the stirring motor 27 is connected with the stirring shaft 31, the second support 17 is rotated and connected with the passive synchronous wheel 17, the passive synchronous wheel 17 and the active synchronous wheel 24 are scrolled and connected with the synchronous belt 20, the synchronous belt The two ends of 20 are affixed with slide plate 22.

The stirring rod 33 includes an elastic rod.

The elastic rods include rubber rods.

The surface of the rubber rod is provided with threads.

The end surface of the rubber rod is connected tangentially with the upper surface of the partition plate 15 when the stirring tube rotates.

The dual-temperature air supply device 1 includes a volute 34, a volute cover 46, an air exchange mechanism and an air supply device; The shell 34 is provided with a first air inlet 44, a second air inlet 45, a first air outlet 41 and a second air outlet 42, the second air inlet 45 communicates with natural air, the first air outlet 41 is provided with a heating device 40 and The heating device controller 39, the heating device 40 is electrically connected with the heating device controller 39; the air supply device is arranged at the air inlet of the volute; the air exchange mechanism is arranged on the air supply device and the first air outlet 41 and the second air outlet 42 Between, the air exchange mechanism is used to switch the air passage that the air supply device respectively leads to the first air outlet 41 or the second air outlet 42; the air exchange mechanism includes an air exchange plate 37 and an air exchange plate motor 38; the air exchange plate One end of 37 is fixedly connected with the output shaft of the air exchange plate motor 38; the other end of the air exchange plate 37 can be close to the bump A or bump B of the upper and lower inner walls of the volute 34 through the rotation of the air exchange plate motor 38; the first The direction of the air outlet 41 and the second air outlet 42 are the same.

The blower device includes a blower motor 36, and a turbine 35 is fixedly connected to the output shaft of the blower motor.

The method for drying peanut seeds using the peanut seed seeding automatic dryer includes the following steps:

(1) Feeding: Put the freshly harvested peanut seeds to be dried into the feeding tank 11 and spread them evenly, with a thickness of 80-120 mm;

(2) closing the door: the chamber door 10 is closed;

(3) energization: the translational motor 26 and the stirring motor 27 of the exhaust valve motor 4, the agitator and the exhaust valve motor 4, the air exchange plate motor 38 of the dual temperature air supply device, the air supply motor 36 and the heating device 40, PLC The control device 9 is respectively connected with the power supply;

(4) Low wind temperature and high wind speed drying: collect the wind temperature and wind speed of the lower chamber of the box body 7 through the wind temperature sensor 13 and the wind speed sensor 12, and then control the heating device 40 through the PLC control device 9 to control the wind temperature at 26-30C , control the air supply motor 36 to control the wind speed at 1-1.2m/s, and dry for 0.5-1h; the freshly harvested peanut seeds to be dried have a higher moisture content, if they are dried at high temperature first, the speed will be too fast, and the precipitation will be too high once. Too many, it is easy to make peanut seeds prone to cracks, thus affecting the germination rate, yield and output value of peanut seeds;

(5) High wind temperature and high wind speed drying: collect the wind temperature and wind speed of the lower chamber of the box body 7 through the wind temperature sensor 13 and the wind speed sensor 12, and then the PLC control device 9 controls the heating device 40 to control the wind temperature at 31-40 ℃, control the air supply motor 36 to control the wind speed at 0.7-0.9m/s, and dry for 0.5-1h;

(6) Low wind temperature and low wind speed drying: collect the wind temperature and wind speed of the lower chamber of the box body 7 through the wind temperature sensor 13 and the wind speed sensor 12, and then the PLC control device 9 controls the heating device 40 to control the wind temperature at 26-30 ℃, control the air supply motor 36 to control the wind speed at 0.4-0.6m/s, and dry for 1-1.5h;

Steps (4) to (6) use dual-temperature air supply devices to implement low-temperature and high-speed drying, high-wind temperature and high-speed drying, and low-wind temperature and low-speed drying to reduce energy consumption and improve The drying efficiency and drying quality are improved, the shrinkage of peanut seeds is more uniform, and the rehydration, germination rate and vitality of peanut seeds are improved.

(7) Warm air circulation heating process: During the drying process of steps (4) to (6), the PLC control device 9 controls the air exchange plate motor 38 so that the other air exchange plate 37 is close to the protrusion on the upper and lower inner walls of the volute 34. Point B, the output shaft of the exhaust valve motor 4 closes the exhaust valve 3, and heats the wind sent by the turbine 35 through the heating device 40, and transports it from the first air outlet 41 to the lower chamber of the box body, and enters through the air hole 4 The peanut seed holding trough 11 dries the peanut seeds. After the humid air is dried by the dehumidifier 8, it enters the turbine 35 through the first air inlet 44 and the ambient air through the second air inlet 45, and then is heated by the heating device 40. , reciprocate in this way to dry the peanut seeds; apply the dual temperature air supply device to implement the warm air circulation heating process. The efficiency has been greatly improved, and the drying method is mild, close to natural drying, with good drying quality, high production efficiency and low operating costs;

(8) Ambient wind temperature and low wind speed slowing process: adopt the ambient wind with a temperature of 20-25°C in the natural environment, and the PLC control device 9 controls the air supply motor 36 to control the wind speed at 0.1-0.3m/s, slowing down for 1.5-2h. In this step, the PLC control device 9 controls the air exchange plate motor 38 so that the other end of the air exchange plate 37 is close to the bump A on the upper and lower inner walls of the volute 34, and the exhaust valve 3 is placed on the output shaft of the exhaust valve motor 4. Open, and the wind of the ambient wind temperature sent by the turbine 35 is transported from the second air outlet 42 to the lower chamber of the box body, and enters the peanut seed storage tank 11 through the vent hole 4 to slow down the peanut seeds, and a part of the humid air After being discharged into the air, a part of it is dried by the dehumidifier 8, and enters the turbine 35 through the first air inlet 44 and the ambient wind through the second air inlet, so that the peanut seeds are slowed down in such a cycle; the dual-temperature air supply device is used to implement The ambient wind temperature is low and the wind speed is slow, so that the moisture inside the peanut diffuses to the surface, so that the moisture in the center and the surface tends to be balanced, and then continues to dry, which improves the quality of peanut drying, reduces energy consumption, improves drying efficiency, and improves the drying efficiency. Ensure the uniformity of the internal and external humidity of peanuts;

(9) Stirring: in step (4)～(6) drying and step (8) in slow Su process, every interval 15～30min, PLC control device 9 controls the translation motor 26 of stirring device to make slide plate 22 with 1～ Move at a speed of 2m/min and make the stirring motor 27 drive the stirring pipe 32 to rotate at a speed of 5-10n/min, thereby driving the stirring rod 33 to stir once the peanut seeds being dried in the storage tank 11; the stirring device The dynamic stirring bar 33 stirs the peanut seeds being dried in the holding tank 11 multiple times, so that the peanut seeds on the top layer and the bottom layer are repeatedly stirred and transposed, so that the peanut seeds on the top layer and the bottom layer are heated evenly, and, The stirring rod uses a rubber rod to prevent damage to the peanut shell during the stirring process. The thread on the rubber rod increases the friction coefficient between the rubber rod and the peanut shell during the stirring process, further improving the stirring effect;

(10) Cyclic drying and slowing process: Repeat the drying of steps (4) to (7) and the slowing process of step (8), until the online infrared moisture meter detects that the moisture content of peanut seeds reaches 8-10% , stop the cycle drying and slow recovery process;

(11) Packaging and storage: Open the box door 10, take out the dried peanut seeds in the storage tank 11 and pack them, store them at a temperature of 5-10°C and a relative humidity of 55%-65%, and store them for later use , Storage at a temperature of 5-10°C and a relative humidity of 55%-65% can effectively guarantee the storage effect of peanut seeds.

Above, the present invention has been described in detail through the specific implementation of the embodiment form, but this should not be interpreted as the scope of the above-mentioned theme of the present invention is limited to the above specific implementation, all technologies realized based on the above-mentioned content of the present invention all belong to scope of the invention.

Claims (9)

1. The fully automatic dryer for peanut seeds, including a box body and an air supply device, is characterized in that: the box body is a closed cuboid with one side opening, and the side opening of the box body is rotated to connect with the box door, and the box door is equipped with PLC control Device; the lower part of the box is fixed with a partition, and the partition divides the box into two closed upper and lower chambers. A stirring device and a storage tank are arranged on the partition. The stirring device stirs the peanut seeds in the storage tank, and stirs An online infrared moisture meter is installed on the second bracket of the device; an air speed sensor and an air temperature sensor are installed under the partition, and ventilation holes are arranged on the partition corresponding to the storage tank; the air supply device is a dual-temperature air supply device, and the dual-temperature air supply device The first and second air outlets are connected to the lower chamber of the box through the air inlet pipe; the top of the box is provided with an exhaust pipe, and an exhaust valve motor is installed on the exhaust pipe, and the output shaft of the exhaust valve motor is fixedly connected to the exhaust valve motor. Air valve, the outer diameter of the exhaust valve matches the inner diameter of the exhaust pipe; the exhaust pipe below the exhaust valve is connected to the warm air return pipe, and the warm air return pipe is equipped with a dehumidification device. The other end is connected with the first air inlet of the dual-temperature air supply device; wind speed sensor, air temperature sensor, online infrared moisture meter, exhaust valve motor, translation motor and stirring motor of the stirring device, exhaust valve motor, dual-temperature air supply The air exchange plate motor of the device, the controller of the air supply motor and the heating controller are respectively electrically connected to the PLC control device; The air exchange plate motor, the air supply motor, the heating device and the PLC control device are respectively electrically connected to the power supply. 2. The automatic peanut seeding dryer according to claim 1, characterized in that: the diameter of the ventilation hole is 2-7mm. 3. The fully automatic drying machine for peanut seeds according to claim 1, characterized in that: the stirring device includes a first bracket and a second bracket fixedly connected to the partition plate, a reduction box is arranged on the first bracket, and the reduction box They are respectively connected with the translation motor and the driving synchronous wheel, the first bracket and the second bracket are fixedly connected to the light rod fixing seat, the light rod fixing seat is fixed to the light rod, the light rod is slidably connected to the sliding sleeve, and the sliding sleeve is fixed to the sliding plate , the slide plate is fixed to the horizontal plate, the end of the horizontal plate is fixed to the vertical plate, the lower end of the vertical plate is rotatably connected to the stirring shaft, the stirring tube is fixed to the stirring tube, the stirring rod is detachably connected to the stirring tube, and the stirring motor is set at one end of the horizontal plate , the stirring motor is connected to the stirring shaft through transmission, the second bracket is rotated and connected to the passive synchronous wheel, the passive synchronous wheel and the active synchronous wheel are scrolled and connected to the synchronous belt, and the two ends of the synchronous belt are fixedly connected to the slide plate. 4. The fully automatic dryer for peanut seeds according to claim 3, characterized in that: said stirring rod comprises an elastic rod. 5. The fully automatic dryer for peanut seeds according to claim 4, characterized in that: said elastic rods comprise rubber rods. 6. The automatic peanut seeding dryer according to claim 5, characterized in that: the surface of the rubber rod is provided with threads. 7. The fully automatic dryer for peanut seeds according to claim 5, wherein the end surface of the rubber rod is connected tangentially to the upper surface of the partition when the stirring tube rotates. 8. The fully automatic dryer for peanut seeds according to claim 1, characterized in that: the dual-temperature air supply device includes a volute, a volute cover, an air exchange mechanism and an air supply device; The base is connected, the volute is sealed with the volute cover, the volute is provided with a first air inlet, a second air inlet, a first air outlet and a second air outlet, the second air inlet communicates with natural air, and the first air outlet There is a heating device and a controller of the heating device, and the heating device is electrically connected to the controller of the heating device; the air supply device is arranged at the air inlet of the volute; the air exchange mechanism is arranged between the air supply device and the first and second air outlets , the air exchange mechanism is used to switch the air duct that the air supply device leads to the first air outlet or the second air outlet respectively; the air exchange mechanism includes an air exchange plate and an air exchange plate motor; one end of the air exchange plate is connected to the air exchange plate The output shaft of the plate motor is fixed; the other end of the air exchange plate can be close to the convex point A or convex point B on the upper and lower inner walls of the volute through the rotation of the air exchange plate motor; the orientation of the first air outlet and the second air outlet is the same . 9. The fully automatic dryer for peanut seeds according to claim 8, characterized in that: the air supply device comprises an air supply motor, and a turbine is fixedly connected to the output shaft of the air supply motor.