JPS5826516B2 - Circulating grain dryer - Google Patents

Description

[Detailed description of the invention] The present invention relates to a grain drying device.

There are two types of circulating grain dryers.

One is a circulation type drying device in which the temperature of the hot air is set to 35° C. or lower, and the circulation is expected to produce an agitation effect, and the drying is completed by circulating the air several dozen times.

In the past, all of them had the above configuration, but recently they are hardly manufactured.

The other type is a type in which a flow-down type drying chamber is provided at the bottom of the flow-down type humidity control tank and is connected to the tank, and a circulation elevator is installed at a side position to reach the humidity control tank from the drying room. The hot air temperature is as high as approximately 50'C, and the epidermis is mainly dried in the drying room, which is then piled up and returned to the humidity control tank, where it slowly flows down for about 1 to 2 hours. During this period, the dried epidermis absorbs the internal moisture, and this process is repeated five times (circulated five times) to complete the drying process.
No. 426), and currently most of this type of circulating grain dryer is manufactured and sold.

The present invention is also an improvement on the latter drying device.

The latter drying equipment uses hot air as high as approximately 50°C,
This is because we want to quickly dry the outer skin of the grain.

Hot air at temperatures as high as 50 degrees Celsius can quickly dry things out.

However, it is not a good idea to always use hot air at the above temperature.

In other words, on days when the outside air temperature is quite high, the temperature of the rice has already risen considerably from the beginning, so if high-temperature hot air is applied to it, there is a risk that it will dry out too much and cause cracking.

Also, on days when the outside temperature is abnormally low, even normal high-temperature hot air will not dry the skin.

Also, the grain capacity cannot be underestimated.

For example, a humidity control tank that can hold a certain amount of water is designed so that when it is filled with the specified amount, it will circulate in about two hours, so if it is only half filled, it will circulate in one hour. As a result, the grain will be exposed to the next round of hot air before the grain temperature has sufficiently decreased, resulting in excessive drying.

Therefore, it is preferable to change the temperature of the hot air based on changes in the outside temperature and the amount of grain stored, and the present invention provides a method for controlling the humidity of grains that is connected to the lower part of the tank for controlling the moisture content of grains. A circulating grain drying device that forms a drying chamber and is provided with an elevator at a side position that stacks and returns the grain discharged from the drying chamber into the humidity control tank at the top, the drying device has an outside air temperature. A circulating grain drying device, which is provided with a detector and a detection amount for detecting the total capacity accommodated in the humidity control tank and the drying chamber, and in which both the lateral movement amounts are connected to a hot air generator in the drying chamber. The structure is as follows.

To explain with a diagram, reference numeral 1 denotes a flowing-down type grain humidity control tank, which is a large tank with a rectangular cavity, and is formed in a size that can accommodate a large amount of grain (approximately 5 to 40 grains).

A downstream drying chamber 2 communicating with the tank 1 is formed in the lower part of the downstream grain humidity control tank 1.

The down-flow drying chamber 2 applies hot air horizontally and laterally to the vertically flowing grain to dry the grain skin, and has a hot air generating furnace 4 equipped with an air blower 3 (or air suction device). Install device 5.

The grains discharged from the drying chamber 2 are lifted up by a circulation elevator 6 provided on the side, and then piled up in the humidity control tank 1 and returned.

The furnace 4 is connected to the fuel tank 7 via a main fuel control valve MV and a fuel pump SP, and the main fuel control valve MV is controlled by an outside temperature detector 8.

FIG. 5 is an example of a control mechanism.

In addition to the outside temperature detector 8, the one shown in FIG. The main fuel control valve MV is controlled by the operation of 9.

To explain FIG. 5, T1 is a timer from fuel stop to motor stop, M is a motor relay, A is an interlocking relay from the motor timer TM to the timer T1, Hv is a valve for ignition fuel, and T2 is an ignition fuel. A timer for controlling the supply time, H is for the ignition heater, L/-1P is a relay for the fuel pump SP, and R is a volume for setting the flow rate.

Since the present invention has the above-described configuration, the elevator 6
When the grain is stored in the humidity control tank 1, the amount of grain stored is detected by the detector 9, and the temperature at that time is detected by the outside temperature detector 8, and the main fuel control valve MV is controlled by the automatic control circuit. control automatically.

Therefore, when the amount filled (accommodated amount) in the humidity control tank 1 is sufficiently large, the detector 9 sends a signal to the main fuel control valve MV to send a large amount of oil, and the hot air at a considerably high temperature is sent. A hot air generator 5 provides high-temperature hot air to the grains.

When this happens, the outer skin of the grain will be sufficiently dry, but the elevator 6
When the hair is piled up in the humidity control tank 1, the storage capacity is sufficiently large, so that the hair flows down for a long time, and when it flows into the drying chamber 2 again, it returns to the state before drying, so it can be dried smoothly.

Furthermore, when the amount of oil stored in the humidity control tank 1 is small, the time for the oil to flow in the humidity control tank 1 is shortened, so the detector 9 sends a signal to the main fuel control valve MV to send a small amount of oil. This is something that you can adjust accordingly.

Furthermore, when the outside temperature is high, the grain temperature itself is also considerably high, so even if low-temperature hot air is applied, the grain temperature will be sufficiently raised.

Therefore, depending on the outside temperature detected by the detector 8, when the outside temperature is high, the amount of oil is decreased as the outside temperature increases, and when the outside temperature is low, the hot air temperature is increased. This prevents drying or insufficient drying.

Figure 6 is a configuration diagram of controlling the main fuel control valve M■ from the outside temperature detector and the filling amount detector, Figure 6 A is a standard configuration diagram, and Figure 6 Port is an equivalent fixed circuit Figure 6C is a configuration diagram with a memory circuit and a buzzer circuit attached, but these circuits themselves are very ordinary computer circuits, except that they are controlled by the outside temperature and the amount of plug-in. belongs to.

Automatic control of the drying temperature of conventionally known grain drying devices is disclosed, for example, in Japanese Patent Publication No. 49-46743 and Japanese Utility Model Publication No. 53-54.
As shown in Publication No. 874, the temperature of the drying wind and the temperature of the grain itself are detected, and the fuel supply amount is adjusted based on the rain detection signal. This is based on the idea that the appropriate temperature standard is always 53°C, for example, and the idea that 50°C is also the best grain temperature.

However, the above assumption is not correct.

For example, when the amount of filling into the humidity control tank and the down-flow drying chamber is small, the cycle time until the top-loaded grain flows into the drying chamber again becomes proportionally shorter, so when the amount of filling is normal, Unless the temperature is considerably lower than that of the previous year, there will be insufficient time to adjust the humidity, resulting in cracked rice.

Also, if the drying air temperature is set to 53℃, if the outside temperature is abnormally low, the air will be cooled more than expected during the humidity adjustment time, and sufficient drying will not be carried out, and if the outside temperature is abnormally high, , the grain will be dried again while the temperature remains high.

However, since the present invention is configured as described above, when the capacity of the humidity control tank and drying chamber becomes very small, drying is performed at a low drying air temperature commensurate with the cycle time.
Furthermore, when the outside temperature is abnormally low, drying is performed at a relatively high drying air temperature, so that the defects of the above-mentioned known example can be avoided.

[Brief Description of the Drawings] Figure 1 is a side view, Figure 2 is a longitudinal front view, Figure 3 is a cross-sectional view of the drying chamber, Figure 4 is a partially sectional side view of the hot air supply device, and Figure 5 is a side view of the hot air supply device. Control circuit diagram, Figure 6 A. C is a configuration diagram. Explanation of symbols, 1... Downflow type grain humidity control tank, 2
...downflow drying room, 3...blower device,
4... Furnace, 5... Hot air generator, 6
...Circulation elevator, 7...Fuel tank, 8...Outside temperature detector, 9...Filling amount detector, M■... ...Main fuel control valve, SP...
...Fuel pump, T1...Timer, T2
...00 Ignition fuel supply time control timer, M...
...Relay for motor, A...Interlocking relay, TM...Timer for motor, H■...
...Timer for ignition fuel, H...Relay for ignition heater, P...Relay for fuel pump, VR...
...Volume for flow rate setting.

Claims (1)

[Claims] 1. A downstream grain drying chamber is formed below the downstream grain humidity conditioning tank and communicates with the tank, and at the side force position, the grain discharged from the drying chamber is placed in the humidity conditioning tank at the top. In a circulating grain drying device equipped with an elevator for top-loading and returning, the drying device is provided with an outside temperature sensor and a detector for detecting the total amount of grain stored in the humidity control tank and the drying chamber, A circulating grain drying apparatus in which both detectors are connected to a fuel control valve of a hot air generator in the drying chamber.