JP2589301B2 - Rice grain supply control device for circulation type rice mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention] (Industrial application field) The present invention relates to a circulation type rice milling machine for controlling the amount of circulating rice grains when circulating the rice grains in the pressure chamber. The present invention relates to a rice grain supply control device.

(Conventional technology) Conventionally, in a circulation type rice mill, rice grains are sent from a hopper to a transfer chamber through a supply port, and the rice grains are pressed into a pressure chamber by a milling roll in the transfer chamber, and the rice grains are polished by friction between the rice grains in the pressure chamber. The rice grains returned to the hopper again, and by repeating this, the brown rice was polished.

(Problems to be Solved by the Invention) In the case of the above conventional technology, the amount of rice grains supplied from the hopper to the transfer chamber is constant in any process of the milling operation, so that efficient milling cannot be performed. There was a problem. That is, when the milling roll starts to rotate at the beginning of milling, if the supply amount of rice grains is large, the circulating load of the rice grains at the start of rotation and the starting load of the main motor are simultaneously applied, and the rotation of the milling roll starts slowly. There is.
In addition, it is preferable to reduce the amount of circulating rice grains during whitening so that the rice can be sufficiently whitened in the pressure chamber.
Bran removal can be performed more efficiently by increasing the circulation amount. However, in the related art, such adjustment cannot be performed automatically.

The present invention has been made in view of the above-mentioned problems of the conventional technology, and can control the supply amount of rice grains so that the operation can be performed most efficiently at each stage of the milling operation. It is an object of the present invention to provide a rice grain supply control device for a circulation type rice mill.

[Configuration of the invention]

(Means for Solving the Problems) According to the present invention, a shutter for controlling the amount of rice grains supplied from a hopper is provided, and a shutter opening / closing device for opening / closing the shutter is controlled by a shutter opening / closing device control means for powering a rice mill. When the shutter enters, the shutter is closed in conjunction with this, the main motor is prohibited from driving until the shutter closes, and the main motor is driven by the rice polishing switch, the shutter opening is set to be greater than after the polishing This is a rice grain supply amount control device for a circulation type rice mill that operates so as to be larger during the removal of bran.

(Operation) The apparatus for controlling the amount of rice supplied to a circulating rice mill according to the present invention controls the amount of rice supplied from a hopper by opening and closing a shutter so that the polishing operation can be performed most efficiently in each polishing step. It was done.

(Embodiment) Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

The rice mill of this embodiment is a so-called circulation type rice mill, and as shown in FIG. 3, a transfer chamber 2 is provided at an upper portion of a rice mill main body 1, and a rice mill which presses and transfers rice grains into the transfer chamber 2. The roll 3 is rotatably mounted. The milling roll 3 is coaxially connected to a pulley 5 via a shaft 4, and the pulley 5 is connected to a pulley 7 of the main motor 3 and a belt 8.
Are connected via

Below the transfer chamber 2, a bran-removing net 9 is attached, and at both ends of the transfer chamber 2, pressure chambers 10, where milling pressure is applied to rice grains,
And a supply port 11 for rice grains. This pressure chamber 10,
Above the supply port 11, a hopper 12 for accommodating rice grains is fixed. In the pressure chamber 10, a resistor 13 that applies resistance when the rice grains are recirculated and applies pressure to the rice grains by the pressing force of the milling roll 3 is rotatably mounted. As shown in FIG. 4, the resistor 13 is provided so as to be rotatable integrally with a shaft 14 provided perpendicularly to the flow direction of the rice grains. It is engaged with the moving member 15. The sliding member 15 is a first resistor driving device.
Screwed with a helical shaft 17 rotated by a sub motor 16,
The rotation of the helical shaft 17 causes the sliding member 15 to move in the axial direction of the helical shaft 17, and rotates the shaft 14 to rotate the resistor 13. Further, before and after the moving range of the sliding member 15, there are provided limit switches 18 and 19 for detecting a position where the resistor 13 retreats and does not apply resistance to the rice grains and a position where the resistance is maximized. I have.

In addition, as shown in FIG.
A shutter 42 for adjusting the amount of rice grains supplied from 12 is provided. The shutter 42 has a support portion 43 having a spiral axis.
The spiral shaft 44 is screwed to the spiral shaft 44, and the shutter is fixed to a second sub-motor 45, which is an opening / closing device, and is provided so as to be rotatable around a long axis. Further, the support portion 43 of the shutter 42
The leading end 43a is provided so that the shutter position detection switches 46, 47, 48 provided along the spiral axis 44 are sequentially turned on in accordance with the movement. Here, the switch 46 detects the closed position of the shutter 42, and the switch 47
The switch 48 detects the state where the shutter 42 is fully open.

As shown in FIG. 1, the electric circuit of the rice mill of this embodiment has a main motor 6 connected to an AC 100 V power source of a commercial power source via a power switch 20. A main motor drive relay 22 and a current transformer (CT) 23 for detecting a load current value of the main motor 6 are connected in series. The output of the current transformer 23 is converted into a digital value by an A / D converter 25 via an amplifier 24 and input to an input port 27 of a microcomputer 26. The input port 27 has a load setting for selectively inputting a set value serving as a reference for controlling the load current value of the main motor 6, for example, one of three types of load set values shown in FIG. Input means 28 is connected. Further, a rice polishing switch 29 for supporting the start of driving of the main motor 6, a limit switch 18 for detecting a retracted position (hereinafter abbreviated as an O position) of the resistor 13, and shutter position detecting switches 46 and 47 for detecting a position of the shutter 42. , 48 are connected.

The microcomputer 26 has a CPU 30, a ROM 31, and a RAM 32, and outputs the signals to a first sub motor drive circuit 34, an LED display 35, a main motor drive relay 22, and a second serve motor drive circuit 49 via an output port 33. Are connected, and each operates according to a command from the CPU 30. The microcomputer 26, the first sub-motor drive circuit 34, the second sub-motor drive circuit 49, and the main motor drive relay 22 are each connected to a power supply circuit 36 to receive power.

The milling control of the rice mill according to this embodiment is digitally processed by the microcomputer 26, and the processing program is stored in the ROM 31 or an external memory (not shown).

As shown in the flow chart of FIG. 2 and the graph of the solid line in FIG. 6, first, when the power switch 20 is closed, the first sub motor 16 and the second sub motor 45 are controlled.
Is reversed, the resistor 13 is returned to the O position where resistance is not applied to the rice grains, and the shutter 42 is positioned at the closed position. The operation of the resistor 13 is such that the helical shaft 17 rotates, the sliding member 15 moves to the left in FIG. 4, and the shaft 14 rotates clockwise to move the resistor 13 in a direction parallel to the rice grain flow path. It is performed by rotating.
Further, when the resistor 13 reaches the O position, the sliding member 15 turns on the limit switch 18, and in conjunction with this, the first sub-motor 16 is stopped. The shutter 42 has a spiral shaft
When the support 44 rotates to the right in FIG. 5 to close the supply port 11 and the switch 46 is turned on, the CPU 30 detects that the supply port 11 is closed, and the second sub motor Stop 45. As a result, there is no supply of rice grains, and the rotation of the main motor 6 starts up quickly. Thereafter, when a desired value of the milling pressure is input from the load setting input means 28 and the milling switch 29 is turned on, the main motor 6 is driven and the milling roll 3 rotates. Further, at the same time, the counting of the fixed set times t1 and T1 is started, and the LED display 35 displays this.
The elapsed time of t1 and T1 is displayed. In conjunction with this, the second sub motor 45 rotates forward, opens the shutter 42,
When the distal end 43a of the support portion 43 turns on the switch 47, the CPU 30 confirms that the shutter 42 is in a half-open state (opening A).
Is detected, and the second sub motor 45 is stopped. Thereby, sufficient whitening is performed in the pressure chamber 10 with an appropriate supply amount of rice grains, and rice is efficiently milled.

Then, when the milling initial time t1 has elapsed, the control of the milling pressure is started. The milling initial time t1 is a period during which the milling roll 3 starts to rotate and the circulation of rice grains is performed uniformly and stably. In the milling pressure control, the output of the current transformer 23 connected in series to the power supply line of the main motor 6 is amplified by the amplifier 24, further A / D converted and input to the microcomputer 26, and the CPU 30 Is compared with the set value.
The CPU 30 of the microcomputer 26 reads the load current value of the main motor 6 from the current transformer 23 after the elapse of the milling initial time t1,
Compare with a preset load set value corresponding to the milling pressure. If the load current value is larger than the set value, the first sub-motor 16 is reversed to retract the resistor 13 from the rice flow path. When the load current value is equal to the set value, the resistor 13 is stopped at the same position. Conversely, when the load current value is smaller than the set value, the first sub motor
16 is rotated forward to rotate the resistor 13 in a direction to block the flow path of the rice grains. In this way, the milling pressure of the rice grains is controlled so as to be within a certain set range. When this milling has been performed for T1 time since the main motor 6 was turned on, the milling operation is completed, and the process shifts to rice bran removal. The T1 time is set to a time sufficient to perform brown rice polishing.

When the T1 time for refining elapses, the second sub motor 45
Is rotated forward, the shutter 42 is further opened, the state is fully opened (opening B), and the switch 48 is turned on so that the tip 43a of the support 43 is turned on.
Then, the CPU 30 determines that the shutter 42 is fully opened, and stops the second sub motor 45. As a result, the amount of circulating rice grains increases, and bran can be removed quickly.
Then, the bran removing time T2 is set, and the process enters the bran removing time. During the bran removal, the main motor 6 is rotated with a small load to perform the bran removal.
Returns to the 0 position. When the predetermined bran removal is completed, the main motor 6 stops.

Further, in this polishing control, all operations are stopped by turning off the power switch 20, and when the power switch 20 is turned on, the first sub-motor 16 and the second sub-motor 45 are always rotated in reverse in conjunction therewith, and the resistor 13 is turned off. The shutter is returned to the zero position and the shutter 42 is closed. Until the resistor 13 returns to the 0 position and the shutter 42 closes, the main motor 6 does not rotate even if various operation switches such as the rice polishing switch 29 and the unremoved bran switch are pressed. Therefore, when all of the milling operations are stopped during the milling, the power switch 20 is turned off, and when milling is performed again, the resistor 13 is always at the 0 position, the shutter 42 is closed, and the milling is stopped. Be started.

Further, the power switch 20 is turned on, and a monitor lamp (not shown) blinks to display the operating state from the time when the first sub-motor 16 starts reverse rotation until the polishing pressure becomes zero.

According to this embodiment, the supply of rice grains can be controlled by the shutter 42, and at the beginning of the rotation of the main motor 6, the shutter 42 is closed, so that there is no supply of rice grains and the rotation of the milling roll 3 rises faster. be able to. Further, during the milling, the shutter 42 is opened halfway to reduce the supply amount of the rice grains, the rice grains sufficiently rub against each other in the pressure chamber 10, and the milling can be efficiently performed. By fully opening 42, the amount of circulating rice grains can be increased and bran can be removed quickly.

Incidentally, the shutter opening / closing device of the present invention may be an electromagnetic drive device other than the monitor. Further, the shutter opening / closing device control means may be a device in which a logic circuit is assembled or a device which performs analog control in addition to the microcomputer.

Further, the shutter opening can be arbitrarily set to three or more stages.

〔The invention's effect〕

The rice grain supply control device of the circulating rice mill according to the present invention can adjust the amount of rice grain flowing from the hopper by the shutter in accordance with the milling condition, so that the supply amount of the rice grain is most appropriate in each milling stage. The milling efficiency can be improved, and high-quality rice can be efficiently provided.

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of the present invention, FIG. 2 is a flowchart showing the operation of this embodiment, FIG. 3 is a vertical sectional view of a rice mill of this embodiment, and FIG. 5 is a partial sectional view showing the shutter of this embodiment, FIG. 6 is a graph showing the relationship between the grinding pressure and the grinding time, and FIG. 7 is a pattern of each set value of the grinding load. It is a graph shown. 1 ... rice milling machine, 3 ... milling roll, 6 ... main motor, 13 ... resistor, 16 ... 1st sub motor (resistor drive), 26 ... microcomputer, 42 ... shutter, 45 .... 2nd sub motor (shutter opening / closing device)

Claims (1)

(57) [Claims] A rice grain flows into a transfer chamber from a hopper containing rice grains through a supply port, and is pressed into a pressure chamber by a milling roll in the transfer chamber, is milled in the pressure chamber, and returns to the hopper again. In the rice grain supply control device of the circulation type rice mill, a shutter is provided at the supply port to control the flow rate of rice grains, and a shutter opening / closing device that opens and closes this shutter. When the power of the rice mill is turned on, the shutter is opened in conjunction with this. When the shutter is closed, the main motor is prohibited from driving until the shutter is closed, and the main motor is driven by the milling switch.Then, the shutter opening and closing device is driven according to the milling condition, and the opening of the shutter is adjusted after the milling is completed. And a shutter opening / closing device control means for performing stepwise control so as to adjust the supply amount of rice grains so that the time of rice removal is larger than that of rice bran removal. Recycling rice mill rice grain supply amount control apparatus comprising Te.