JPH0321139B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in a method for drying soybeans.

Previously, soybeans harvested from the field with their grain culms were thoroughly dried and then subjected to a threshing machine (threshing machine) to be threshed into soybean grains.
Recently, soybean grains that have a moisture content of 20% or more and are not fully dried are shredded using a granulator, and the shredded soybean grains are dried using a dryer to a final moisture content of 15%.

By the way, soybean grains are easily damaged, especially 20
% or more, the surface will be damaged even by the slightest impact, so drying soybean grains in a dryer that has been shredded with a high moisture content using a shredder as described above is not suitable for paddy or wheat. If drying is carried out using the circulating grain dryer used for drying, many damaged grains will be produced, so the soybean grains are piled up in a thin layer in a flat box-shaped drying tank, and hot air is blown through them with a blower. This is done using a small-capacity, flat-box type dryer called a flat dryer. And from this,
This method is not only inefficient, but also has the problem of not being able to dry a large amount of soybean grains at once.

The purpose of the present invention is to solve these problems and propose a new drying method that can dry high-moisture soybean grains without causing damage using a large-capacity circulating grain dryer. It is in.

To achieve this objective, the method for drying soybean grains according to the present invention consists of a grain tank into which the grains to be dried are placed, a grain tank in which the grains are placed in the grain tank, and a grain tank in which the grains filled in the grain tank are carried out and then returned to the grain tank. A circulating grain grain circulation system comprising: a grain circulation conveyance device for returning the grains to the inside; a hot air generation device that generates hot air; and a blower that sends the hot air generated by the hot air generation device to the grains placed in the grain vat. A drying process in which the soybean grains are piled up in a grain tank of a dryer, the grain circulation conveyance device is stopped, and hot air is sent to the piled soybean grains for a certain period of time, and the soybean grains stretched in the grain tank are a circulation step in which the grain circulation conveyance device is operated for a period of time to circulate a certain amount of soybean grains, which is less than half of the amount of soybean grains;
It is characterized by repeated drying.

Next, embodiments will be described in detail with reference to the drawings.

The figure shows an example of a circulating grain drying device used in an embodiment of the method of the present invention, and shows a cylindrical circulating grain drying device in which the grain vat into which the grains to be dried are placed is vertically oriented in the axial direction. . In the figure, 1 is the fuselage that constitutes the main body, which is assembled by connecting corrugated iron plates 10 formed in an arc shape on a base 2 made of concrete. It is constructed in a cylindrical shape with a height of approximately 2,700 mm, and has a roof 11 on the top side. a is a grain tank installed in the body 1, which is attached to the base 2 at the bottom of the inner cavity of the body 1;
A floor plate 3 made of an air-permeable partition wall is placed on a shelf at a position slightly elevated from the upper surface of the fuselage body 1 so as to partition the inner cavity of the fuselage body 1 into upper and lower parts, so that the inner cavity of the fuselage body 1 is formed above the floor plate 3. The empty space below the floor plate 3 is formed into a guide path b for hot air to be sent to the grains placed in the grain tank a. Reference numeral 4 denotes an elevator (bucket elevator) for loading grain into the grain tank a, and a loading hopper 42 is located at the bottom of the grain lifting tower 41 that stores the bucket conveyor 40.
is installed. The starting end of the upper screw conveyor 43 is connected to the discharge port at the top of the grain lifting tower 41 of the elevator 4, and the outlet 43a at the terminal end of the upper screw conveyor 43 opens at the upper part of the inner cavity of the grain tank a. , an equalizer 44 is installed below the outlet 43a. Reference numeral 30 denotes an outlet through which the grains loaded into the grain tank a by the elevator 4 and the upper screw conveyor 43 flow out from the grain tank a, and is opened at the axial center of the floor plate 3 mentioned above.

Reference numeral 5 denotes an auger for conveying the grains placed in the grain tank a and deposited on the floor plate 3 toward the outlet 30, and the base end is connected to the gear box 50 disposed at the center of the outlet 30. The gearbox 50 is supported and rotates about a rigid rotation axis, thereby revolving around the gearbox 50, and
During its orbital rotation, it rotates and the grains are delivered to the outlet 3.
Transport towards 0.

Reference numeral 6 denotes a lower screw conveyor for conveying the grains flowing out of the outlet 30 to the outside of the machine body 1. The lower screw conveyor 6 is disposed within the aforementioned air guide path b, and its terminal end 6a in the conveying direction is connected to the outside of the machine body 1. It protrudes from the top and is connected to and communicates with the lower end of the grain lifting tower 41 of the elevator 4. and,
This lower screw conveyor 6 is connected to the elevator 4.
In combination with the upper screw conveyor 43 and the auger 5, it constitutes a grain circulation conveyance device c that circulates the grains discharged from the outlet 30 back into the grain tank a from the upper part of the grain tank a. .

Reference numeral 7 denotes a blower for supplying hot drying air to the grains placed in the grain vat a, and its outlet is connected and communicated with the aforementioned air guide path b via a duct 70. A burner device 8, which is a hot air generating device, is attached to the suction port 71.

Reference numeral 9 is a suction fan for dehumidification that discharges hot air (exhaust air) that has passed through the grain layer in grain tank a and become humidified to the outside of grain tank a, and forms the ceiling of grain tank a. It is installed on the roof 11 of the aircraft body 1, and an air exhaust duct 90 is connected to its air outlet.

Furthermore, m ₁ is a motor that drives the lower screw conveyor 6 and auger 5, m ₂ is a motor that drives the bucket conveyor 40 and upper screw conveyor 43 of the elevator 4, and m ₃ is a motor that drives the equalizer 4.
_m4 is a motor for driving the suction fan 9, _m5 is a motor for driving the blower 7, and these motors are connected to the control box d.
It is controlled by a control device installed in the

Therefore, the soybean grains G to be dried are placed in the grain tank a of the above-mentioned cylindrical circulating grain drying device A.
Pile it in an amount that will give a pile height of about 1 meter.

Next, in this state, motor m ₁・m ₂・m ₃
The operation of the grain circulation conveyance device c is stopped, and in this state, a drying process is performed for a certain period of time in which the blower 7, the burner device 8 as a hot air generating device, and the suction fan 9 are operated. This time is set as desired depending on the temperature of the hot air sent into the air guide path b by the blower 7 and the capacity of the blower 7. However, if the hot air temperature is about 35 degrees Celsius and the blower 7 is a normal type, Drying speed per hour
Since the drying temperature is about 0.3%, the drying time may be set to about 4 hours, which is the time range for drying about 1 to 1.5%.

Next, the grain circulating and conveying device c is operated to perform a process of circulating and flowing the accumulated layer of soybean grains G that is standing still in the grain tank a. This step is carried out for a period of time to circulate one-half, one-third, or one-fourth of the total amount of soybean grains deposited, and a predetermined amount of soybean grains set as desired, which is less than half the amount. The auger 5 rotates on its own axis while revolving on the floor plate 3.
When using the grain drying device A that sends the grains to the outlet 30, the auger 5 is rotated once in a revolution (approximately 13 minutes), and the time is a multiple of that time. Set. Note that there is no need to stop supplying the hot air during the process of circulating and flowing the grains (soybean grains).

These two steps are then repeated alternately until the moisture value of the soybean grains G poured into the grain tank a reaches 15%. The repetition of this process is actually carried out by the motor which is the operating motor of the grain circulation conveyance device c.
You can automatically control m ₁ , m ₂ , and m ₃ using a timer.

As explained above, in the method for drying soybean grains according to the present invention configured as described above, the soybean grains loaded into the grain tank a of the circulation type grain drying device are piled up in the grain tank a. In this state, the soybean grains are deposited by the grain circulation conveyance device C, which is operated intermittently for short periods after relatively long pauses. Since a fixed amount of less than half of the total amount of soybean grains is exchanged from the lower layer to the upper layer, the entire soybean grains loaded into the grain tank a are evenly brought into contact with the grain circulation conveyance device C. The opportunity for drying is extremely limited.

Therefore, according to the method of the present invention, a large amount of soybean grains can be dried using a circulating grain drying device while effectively preventing the occurrence of damage.

[Brief explanation of the drawing]

The drawing is a front view, partially cut away, of a circulating grain drying apparatus used for carrying out the method of the present invention. Explanation of drawing symbols A... Circulating grain drying device, a... Grain tank, b...
... Air guide path, c ... Grain circulation conveyance device, 1 ... Body, 10 ... Corrugated iron plate, 11 ... Roof, 2 ... Base, 3 ... Floor plate, 30 ... Outlet, 4 ... ... Lifting machine (bucket elevator), 40 ... bucket conveyor, 41 ... grain lifting tower, 42 ... staking hopper,
43... Upper screw conveyor, 43a... Outlet, 44... Equalizer, 5... Auger, 50...
...Gearbox, 6...Lower screw conveyor, 6a...Terminal section, 7...Blower, 70...Duct, 71...Suction port, 8...Burner device, 9
...Suction fan, 90...Exhaust duct.

Claims (1)

[Claims] 1. A grain tank in which soybean grains are loaded with grains to be dried, a grain circulation conveyance device that carries out the grains loaded into the grain tank and returns them to the grain tank again, and a hot air generation device that generates hot air. The grain is piled up in the grain vat of a circulation type grain drying device, which is equipped with a blower that sends hot air generated by a hot air generation device to the grain placed in the grain vat, and the grain is circulated and deposited. a drying process in which hot air is sent to the soybean grains in a piled state for a certain period of time, and a drying process in which a certain amount of soybean grains, which is less than half of the soybean grains loaded in the grain vat, is circulated for a period of time. A method for drying soybean grains, which comprises drying by alternately repeating a circulation step of operating a conveying device.