JPH0794014B2 - Removal rate control device in a huller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention is a huller equipped with a pair of left and right derolling rollers, and controls the dewetting rate of the derolling rollers based on the result after dehulling. For the device.

[Conventional technology]

For the removal rate control in the recent hulling machine, the removal rate of the scrapped rice after removal is measured by a removal rate sensor, and the removal rate detected by this removal rate sensor is set to the target removal rate. The so-called feedback control that increases or decreases the gap is adopted, and a removal rate sensor for detecting the removal rate in the scrapped rice after the removal is described in, for example, JP-A-56-118745. As described in JP-A-59-112846 and the like, a so-called compound grain type desorption rate sensor that irradiates light on an appropriate number of grains of rice at the same time and detects desorption by the reflected light. As described above, there is a so-called single-grain type desorption rate sensor in which light is radiated for each grain on an appropriate number of grains and the desorption rate is detected by the reflected light.

[Problems to be solved by the invention]

However, the former compound grain type removal rate sensor detects the removal rate by simultaneously irradiating light on a plurality of grains of scraped rice, and can detect the removal rate for a short time. The removal rate control using the compound grain type removal rate sensor has a good responsiveness for each change of the removal state by both removal rolls based on the removal result, and the supply amount of the paddy changes and the properties of the paddy change. Although it has the advantage of being able to respond quickly to such problems and having good control stability, the method of irradiating light on a plurality of grains of scraped rice at the same time has a considerable error in detecting the loss rate. Therefore, the precision in the removal rate control is low.

On the other hand, the latter single-grain type removal rate sensor detects the overall removal rate of a plurality of grains by irradiating light on each grain of a plurality of grains. Therefore, since there is little error in detecting the removal rate and the removal rate can be accurately detected, the removal rate control using this single-grain type removal rate sensor has the advantage of improving the control accuracy, but it does not It takes a long time to detect the removal rate as a whole of multiple grains by irradiating each grain with light on the scraped rice. In other words, it takes a long time to detect the result and Based on the above, the responsiveness of changing the state of removal by both derolling is poor, so it is not possible to quickly respond to changes in the supply amount of paddy or changes in the properties of paddy, and control is unstable. there were.

The present invention provides a removal rate control using a compound grain type removal rate sensor and a removal rate control using a single grain type removal rate sensor.
It is an object of the present invention to provide a removal rate control device which is combined so as to make full use of these advantages.

[Means for solving problems]

In order to achieve this object, the present invention is a hulling machine comprising a pair of derolls, and a mechanism for adjusting the gap between the two derolls, in which an appropriate number of particles after derolling by the derolling is used. A compound grain type removal rate sensor that detects the removal rate by irradiating light on the removed rice at the same time and detecting the removal rate by the reflected light. While a single particle type desorption rate sensor that irradiates light and detects the desorption rate by the reflected light is provided, the desorption rate detected by the compound grain type desorption rate sensor becomes equal to the target desorption rate. As described above, the compound grain type removal rate control means for increasing or decreasing the gap between the two derolling rolls, and the removal rate detected by the one grain type removal rate sensor after the control by the compound grain type removal rate control means. Increase / decrease the gap between the two rolls to be equal to the target roll-out rate Is obtained by the structure in which the grain type de ratio control means to so that.

[Operation and effect of invention]

According to this structure, when the removal work is started, the removal rate control by the compound grain type removal rate control means is started. The control of the rate shifts to the control by the single grain type removal rate control means, and it becomes possible to control so that the removal rate of the scrapped rice exactly matches the target removal rate, and the supply amount of paddy fluctuates. Alternatively, even when the properties of the paddy are changed, first, by the removal rate control by the compound grain type removal rate control means, from the time when the removal rate of the slid rice is made to be substantially the target removal rate,
The control of the removal rate shifts to the control by the single grain removal rate control means, so that the removal rate of the scrapped rice can be controlled to exactly match the target removal rate.

Therefore, according to the present invention, the low control accuracy, which was a problem of the removal rate control using the multiple grain type removal rate sensor, is performed after the removal rate control using this multiple grain type removal rate sensor. While the removal rate control using the single particle type removal rate sensor can be covered, the control instability that was a problem of the removal rate control using the single particle type removal rate sensor can be solved. Since the removal rate control using the compound grain type removal rate sensor performed before the removal rate control using the sensor can be covered, as a result, the feedback control of the removal rate can be stabilized with high accuracy. With the effect that can be done.

〔Example〕

An embodiment of the present invention will now be described with reference to the drawings. In the drawings, reference numeral 1 is provided with a paddy supply hopper 2 at the upper part, and a pair of left and right derolling rolls 3 and 4 at the lower part of the paddy supply hopper 2 respectively. Shown is a hulling machine equipped with a wind-selecting section 5 for wind-selecting the rice husks from the scraped-off rice removed by the rolls 3 and 4 with a suction dust-exhausting fan 6, which has been selected by the wind-selecting section 5. The subsequent scraped rice is from the scraped rice chute 7 to the bucket conveyor 8
It is configured so that it enters and is sent out of the machine by the bucket conveyor 8.

The two derolling rolls 3 and 4 are rotationally driven by a motor 9,
One of the derolling members 3 is of a fixed position type, but the other derolling member 4 is configured to move toward or away from the one derolling member 3 by a gap adjusting mechanism 11 driven by an actuator 10. Has been done.

Between the paddy feeding hopper 2 and both derolling rolls 3 and 4,
Manually openable shutter (not shown) and paddy supply valve 12
And a lead roll 13 are provided.

Further, the slid-down rice flowing down from the two derolling rolls 3 and 4 is reflected by one of the grain plates 14 at the lower portion thereof as shown by an arrow A and collides with the other grain plate 15, and then the wind. Election section 5
It is configured to fall into.

The other grain plate 15 is provided with a lower open type pocket portion 16 into which a part of the sliding rice that collides is inserted, and the sliding rice that enters this pocket portion 16 is the pocket portion 16 concerned. While it is configured to flow out from the open portion at the bottom after being temporarily stagnation inside, above the pocket portion 16, light is simultaneously applied to a large number of grains of the scraped rice in the pocket portion 16. A compound grain type desorption rate sensor 17 is provided which is irradiated and detects the desorption rate in the scraped rice by its reflected light. It should be noted that, between the pocket portion 16 and the deflation rate sensor 17, rice husks do not enter between the pocket section 16 and the deflation rate sensor 17, and an air outlet 18 is provided so as to prevent dirt and the like on the deflation rate sensor 17.
Further, on the outside of the pocket portion 16, there is provided a sliding-off rice sensor 19 which is turned on when the amount of sliding-off rice is at least the decontrollable minimum amount.

Sampling was performed so that a portion of the slid rice dropped from the wind sorting unit 5 was received between the wind sorting unit 5 and the slid rice chute 7 and the grains were arranged in a line one by one. A gutter 20 is provided. Above the sampling gutter 20, each grain of the slid rice that flows in the sampling gutter 20 is irradiated with light, and the reflected light discriminates between brown rice and paddy to remove the sludge. A single grain type desorption rate sensor 21 for detecting the desorption rate of rice is provided.

Reference numeral 22 in the figure is the compound grain type desorption rate sensor 17,
An electronic control circuit for controlling the increase / decrease in the gap between the two derolling rolls 3 and 4 based on the signals from the single grain type removal rate sensor 21 and the scraped rice sensor 19 is shown.
The reference numeral 22 designates a compound of which the gap between both derolling rolls 3 and 4 is increased / decreased so that the removal rate X1 of the slid rice detected by the compound grain type removal rate sensor 17 becomes a preset target removal rate X. After being controlled by the grain type declining ratio control means and the control by the double grain type declining ratio controlling means, the declining rate X2 of the slid rice detected by the single grain declining rate sensor 21 becomes a preset target declining rate X. In addition to the single grain type removal ratio control means for increasing and decreasing the gap between the two removal rolls 3 and 4 as described above, the control by these both removal ratio control means is performed by the sliding rice sensor.
It also has means adapted to be performed based on 19 ON.

To explain this in detail in the flow chart shown in FIG. 3, in step S1 following the start, the preset target removal rate X is read, and in the next step S2, it is determined whether or not the polished rice sensor 19 is ON, Only when the scraped rice sensor 19 is ON, move to step S3,
Here, the removal rate X1 of the scraped rice is detected by the compound grain type removal rate sensor 17. Next, in step S4, X1 is compared with X. If X1 <X, the gap between the two derolling rolls 3 and 4 is narrowed in step S5, and if X1> X, step S6.
By performing the operation to widen the gap between the two derolling rolls 3 and 4, the multi-grain type removal rate control is performed.

If X1 = X in this compound grain type removal rate control, it is determined in step S7 again whether the slid rice sensor 19 is ON or not. Only when the slid rice sensor 19 is ON, step Go to S8, read the preset target desorption rate X, and in the next step S9, the single particle type desorption rate sensor.
Detecting the loss rate X2 of scrapped rice by 21 and then stepping
In S10, the above X2 is compared with X. When X2 <X, in step S11 the gap between the two derolling rolls 3 and 4 is narrowed and X2> X.
In the case of, in step S12, the operation for widening the gap between the two derolling rolls 3 and 4 is performed to perform the single-grain type delaminating rate control.

If X2 = X in this compound grain type desorption rate control, it is determined in step S13 whether or not the preset target desorption rate X has been changed. The process is returned to the step S7 and the single particle type desorption rate control is continued as it is. However, when the target desorption rate X is far from high, the process is returned to the step S1 and the control is restarted from the beginning. .

[Brief description of drawings]

The drawings show an embodiment of the present invention, FIG. 1 is a vertical sectional front view of a huller, FIG. 2 is an enlarged view of a main part of FIG. 1, and FIG. 3 is a flow chart of control. 1 ... hulling machine, 2 ... hull supply hopper, 3,4 ... derolling, 5 ... wind selection section, 9 ... derolling drive motor,
11 …… Gap adjusting mechanism, 14,15 …… Flood board, 16 …… Pocket part, 17 …… Compound grain type desorption rate sensor, 19 …… Slipped rice sensor, 20 …… Sampling gutter, 21 …… One Grain type removal rate sensor, 22 ... Electronic control circuit.

Claims (1)

[Claims] 1. A hulling machine comprising a pair of derolling rollers and a mechanism for adjusting the gap between the derolling rollers, for an appropriate number of grains of the fallen rice after the derolling. Simultaneously irradiate light and detect the desorption rate by its reflected light, and a compound grain type desorption rate sensor, and after irradiating light to each grain of the appropriate number of slid rice, A single-grain type desorption rate sensor configured to detect the desorption rate by reflected light is provided, and both derolling rolls are provided so that the desorption rate detected by the compound grain type desorption rate sensor becomes equal to the target desorption rate. After the control by the multi-grain type desorption rate control means for increasing and decreasing the gap of, the desorption rate detected by the one-grain type desorption rate sensor becomes equal to the target desorption rate. Single grain type de-rolling in which the gap between the two de-rolling rolls is increased or decreased. Removal rate controller in rice huller, characterized in that a control means.