JPS609232B2 - Grain dryer automatic control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic control device for a grain dryer, and in the grain circulation drying process of a circulation type grain dryer, grains in an upper grain tank are collected in a lower grain channel to form a grain layer. The drying air from the hot air chamber is passed through the grain layer in a horizontal direction and flows out into the exhaust chamber to perform the drying action of the hot air. The structure is such that the grain rotates at a predetermined speed and quantitatively flows out into the lower flow grain tank and is repeatedly circulated inside the machine, or the grain is disposed between the blade of the discharge valve mounted on the lower end of the flow channel and the machine wall. When grains are caught, broken rice and dehulled grains are generated, causing the grains to stop rotating, or fine dust and impurities mixed in with the grains are released by drying and sneak into or adhere to the rotating parts, reducing the rotation speed. As a result, there are disadvantages such as a decrease in taste and quality change due to excessive heating, and generation of heat-damaged grains.

Therefore, in view of the above-mentioned drawbacks, the present invention detects a change in the predetermined rotational speed of the discharge valve using a simple device consisting of a permanent magnet and a one-node switch, and immediately automatically stops the drive section of the grain circulation drying process. The purpose of this invention is to develop and provide a novel device with the advantage of completely preventing deterioration in the quality of dried grains.

To explain the embodiment of the present invention, reference numeral 1 in the figure is a drying section body in which a hot air chamber 2, grain flow channels 3, 3, and exhaust chambers 4, 4 are arranged side by side. Equipped with 5,
It is also a circulating grain dryer integrally formed with an elevator 6 erected on one side. Next, talking about the grain circulation drying process wind of the dryer, the grain tank 5 installed at the top has a grain distribution disk 7 rotatably suspended at the center of the upper wall, and the distribution disk 7 is installed on one side of the machine. The lower part of the grain tank 5 is connected to the upper discharge port of the elevator 6 by a conveyor 8, and the lower part of the grain tank 5 is conveyed to grain flow channels 3, 3 formed with porous walls on both sides, and the hot air for drying from the hot air chamber 2 flows through the flow channel. It is formed so that it passes laterally through the grain layer formed in the air, flows out into the exhaust chambers 4, and performs a drying action.
Next, the dried grains are fed to the elevator 6 by the conveyor 11 installed at the bottom of the grain tank I0 intermittently by the rotation of the discharge valves 9, 9 installed at the lower end of the flow path 3. The grains flow out to the mouth and are fried again into the upper grain tank 5 by the rotation of the conveyor of the elevator 6, thereby performing so-called circulating tempering drying.

In addition, each rotating part of these grain circulation drying sails is a pulley,
They are connected to a drive motor 13 by a rotation transmission means 12 such as a belt and a gear crank mechanism, and are configured to rotate respectively.

Further, 14 is an exhaust fan, and 15 is an operation box attached to the machine body 1.Next, regarding the grain flow channels 3, 3, there is a discharge outlet provided with radial blades 16 at the lower end entrance of the grain flow channels 3, 3. The valve 9 is rotatably mounted, and its rotating shaft 17 protrudes outside the machine via a bearing 18 mounted on the machine body 1, and a pulley 19 is mounted on one end of the shaft to perform the circulation drying process. The shaft end 17a on the other side projects into the switch box 20, and a permanent magnet 21 is fixed to a part of the circumferential surface of the end, and a lead is attached to the position where the magnet 21 faces. switch 22
The two boxes are suspended across the river.

The switch 22 is connected to a transistor detection circuit 50' of the operation box 15 provided in the aircraft body 1. Therefore, to explain the electric circuit diagram of FIG.
It is connected to a three-phase AC power source consisting of R to T phases through the second contact 52a. Also, the contactor 52 is connected between R and T of the AC power source.
The electromagnetic coil 52b and the contact 53a of the relay 53 described later
are connected in series to form a drive control circuit 54.
Next, a series circuit of resistors 55 and 56 is inserted between the bus lines V and G with the reed switch 22 in between, and a capacitor 57 is connected to the common connection point between the switch 22 and the resistor 56.
The base of the NPN type transistor 58 synchronized with the reed switch 22 is connected through the terminal and the emitter is connected to the bus line G.
The collector is connected to the bus line V via a resistor 60. Next, the common connection point between the resistor 60 and the collector is the resistor 6
The emitter of the transistor 62 is connected to the bus G, and the collector A relay 53 and a rectifier 64 of the polarity shown are connected in parallel, and each is connected to the bus line V to form a transistor detection circuit 5.
0 is formed. Since the present invention is configured as described above, raw grain is supplied to the lower hopper of the elevator 6 and
When the respective power switches of the operation box 15 provided in the control box 15 are closed, the electric motor 51 for the disturbance of the grain circulation drying process rotates, and each circuit 50, 54 is energized and operated.

Then, the grains are put into the grain tank 5 at the top of the machine body 1, and a part of the grains flows down and accumulates in each grain flow path 3, 3, forms a grain layer, is dried by the hot air, and is dried at the lower end of the grain layer. The dried grains are discharged intermittently by rotation of the provided discharge valve 9 at a predetermined speed, and the grain circulation drying process air is circulated several times to adjust the drying to a predetermined moisture content. Next, when the discharge valve 9 rotates normally and rotates at a predetermined rotation speed, the permanent magnet 21 fixed to the circumferential surface of the rotating shaft 17 and the reed switch 22 periodically face each other. The contact 22a of the lever is periodically closed by magnetic action, and the current of the bus V is passed through the resistor 55, the switch 22,
It flows through the resistor 59 side and instantaneously charges the capacitor 57. Further, when charging the capacitor 57, a voltage drop occurs on both sides of the resistor 59, and the voltage is applied between the base and emitter of the transistor 58, and the current flowing from the bus V through the resistor 60 flows through the transistor 58 side, and the voltage drops on both sides of the resistor 59. Since the discharge current also flows through the circuit, the capacitor 63 does not reach a predetermined capacitance, and the transistor 62 side always maintains an open state. Next, when the above-mentioned failure occurs and its rotation speed is delayed and changes, the charging cycle for the predetermined capacitance on the primary capacitor 57 side is delayed, and on the secondary capacitor 63 side, the charging cycle for the predetermined capacitance is delayed. In order to properly regulate the discharge of charge, a predetermined capacitance of the secondary capacitor 63 can be easily achieved and the transistor 62
A current is applied between the base and emitter of the bus bar V and G, and the current flows through the relay 53 and the transistor 62.

Therefore, the electromagnetic coil 53b of the relay is energized and opens the contact 53a provided in the control circuit 54, and the electromagnetic coil 52b of the electromagnetic contactor is demagnetized and the contact 52a of the drive circuit is opened.
As mentioned above, the electric motor 51 for driving the grain circulation drying process
will stop rotating. Next, the discharge valve 9
If the rotation of the reed switch 22 stops due to a failure, the secondary capacitor 63
in order to charge a predetermined capacitance, the transistor 62,
The relay 53 is energized and the rotation of the drive motor 51 is immediately stopped.

As described above, the present invention detects the rotational speed of the discharge valve by installing a control device and a circuit in parallel with a control device equipped with a permanent magnet and an IJ switch, which have an extremely simple structure and are easy to install and operate. The grain circulation drying process can be completely controlled by stopping the rotation of the grain, and the drying process can be completely controlled reliably and easily.
It promotes automation and has remarkable effects such as always ensuring high quality dried grains by preventing the occurrence of cracked rice, dehulled flakes grains, and Tsukioka cracked grains due to overdrying.

[Brief explanation of drawings]

The drawings illustrate embodiments of the present invention; FIG. 1 is an elevational cross-sectional view of an apparatus implementing the present invention, FIG. 2 is a cross-sectional view of the main part thereof, and FIG.
The figure is its electrical circuit diagram. 1...Drying section fuselage, 2...Hot air chamber, 3...
...Grain channel, 4...9E wind chamber, 5...
... Grain tank, 6 ... Elevator, 7 ... Dispersion plate, 8 ... Conveyor, 9 ... Discharge valve, 10 ... Grain flow tank, 11 ...Conveyor conveyor, 12...
... Rotation transmission means, 13 ... Drive electric motor, 14 ... 9E wind machine, 15 ... Operation box, 16 ... Vane, 17. ... Rotating shaft, 18 ... Bearing, 19 ... Pulley, 2
0... Switch box, 21... Permanent magnet, 22... Reed switch, 50...
Transistor detection circuit, 51...Electric motor, 52...
...Magnetic contactor, 53...Relay, 54.
...Drive control circuit, 55, 56, 59, 60,
61... Resistor, 57, 63... Capacitor, 5
8, 62...transistor, 64...rectifier,
R, S, T... Power supply. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. In a device in which a grain circulating drying process is formed by combining a grain tank and an elevator with a drying unit body in which a grain flow path, a hot air chamber, and an exhaust air chamber are arranged side by side, the rotating shaft of the discharge valve provided in the grain flow path or its rotation A permanent magnet is fixed to the moving part, and a reed switch is installed at a position facing the magnet so that the reed switch is periodically opened and closed by the rotation of the discharge valve, and the reed switch is configured to operate at a predetermined position. A transistor detection circuit configured to operate a relay when the periodic opening/closing operation of the discharge valve changes is provided, and the contacts of the relay are connected to an intervening drive control circuit, and in response to a change in the rotational speed of the discharge valve, the relay is operated. An automatic control device for a grain dryer that stops the rotation of the drive motor for the grain circulation drying process.