JP2522472B2 - Removal rate control device in a huller - Google Patents

Description

TECHNICAL FIELD The present invention relates to a hulling machine provided with a pair of left and right derolling rolls, and a device for controlling the removal rate thereof.

[Conventional technology]

In the hulling machine, the rate of defoliation of the slid rice that has been removed by the derolling is detected by a rate sensor, and the gap between the two derolling rollers is increased or decreased so that the detected rate of desorption becomes equal to a preset target rate. Such a sensor type removal rate control is described in, for example, JP-A-60-7944.

[Problems to be solved by the invention]

This sensor type removal rate control is a so-called feedback control in which the removal rate of the scrapped rice after removal is observed and the gap between the two removal rolls is increased or decreased so that this removal rate becomes a preset target removal rate. From the current type de-rate control (the load current of the motor that drives the pair of de-roll is detected, and the gap between the two de-rolls is adjusted so that this load current becomes the load current value that obtains the preset target de-rate. It has the advantage that the precision of the removal rate control is higher than that of the one that increases and decreases).

The feedback control by the removal rate sensor detects the removal rate of the scrapped rice after the removal and compares the detected removal rate with the target removal rate to increase or decrease the gap between the two removal rolls. , It is the one to match the removal rate of scraped rice with the target removal rate, and if the removal rate of the scrapped rice after removal is lower than the target removal rate, the gap between both derolling rolls is controlled to be closed. It is.

On the other hand, the new rice (immature rice) contained in the paddy is
Since it is more difficult to remove than normal paddy (mature paddy), the removal rate of the deciduous rice after the removal will be lower due to the presence of new rice.

Therefore, in the above-mentioned sensor type desorption rate control, when the content of undesired rice is large, the gap between the two derolling rolls is closed, so that normal paddy is crushed, the surface of brown rice is scratched, and further, There was a problem that the abrasion of the derolling was increased.

An object of the present invention is to prevent the occurrence of the above-mentioned inconvenience due to unneeded rice in the sensor type removal rate control.

[Means for solving problems]

Therefore, the present invention is provided with a pair of derolls and a mechanism for adjusting the gap between the derolls, and detects the rate of defoliation of the scraped rice removed by the derolls with a derate sensor. In a hulling machine provided with a sensor type removal rate control means for increasing or decreasing the clearance between the two removal rolls so that the detected removal rate is equal to or substantially equal to a preset target removal rate, When the removal rate of rice does not change due to the operation of both derolling gaps in the closing direction, roll closing motion prohibiting means is provided to inhibit the operation of the two derolling roll gaps in the closing direction. Is.

[Functions and effects of the invention]

According to this structure, during the removal rate control by the sensor type removal rate control unit, the removal rate of the scraped rice becomes lower than the target removal rate, and the clearance of the removal roll is closed accordingly. When the rice dropout rate does not approach the target dropout rate, roll closing prohibition means
Since the closing operation of both derolling gaps is automatically prohibited, it is possible to reliably prevent the gap between both derolling rolls from being closed more than necessary due to a large amount of fresh rice in the paddy.

Therefore, according to the present invention, the normal paddy is crushed in response to an increase in the amount of unwanted rice, the surface of brown rice is scratched, and further, there is no occurrence of problems such as increased wear of derolling. Thus, the sensor type removal rate control can be reliably performed.

〔Example〕

Hereinafter, an example of the present invention will be described with reference to the drawings when applied to a hulling machine in a hulling and sorting apparatus. The hulling and sorting machine is a box-shaped wind selecting mechanism 1 having a horizontally long box, The huller 2 mounted on the left upper surface and the rotary sorting mechanism 3 mounted on the right upper surface of the wind selecting mechanism 1 constitute the whole.

The paddy huller 2 includes a case 4 with a paddy supply hopper 5,
A pair of left and right derollers 6 and 7 provided in the case 4, a manually openable shutter 8 and a paddy supply amount control valve 9 are provided, and both derollers 6 and 7 are inside the wind selecting mechanism 1. It is rotationally driven by a de-rolling motor 10 provided on one side, one of the de-rolling type 6 is of a fixed position type, and the other de-rolling type 7
Is configured to move toward or away from the one derolling roll 6 by a gap adjusting mechanism 12 driven by an actuator 11, and the paddy supply amount adjusting valve 9 is moved by an actuator 13. It is configured to open and close.

In this case, the de-motor 1 for both the de-rolls 6 and 7
An ammeter 14 for detecting the load current is provided at 0, a positioner 15 for detecting the opening position of the paddy supply amount control valve 9 is provided, and both derolling rolls are provided.
The gap adjusting mechanism 1 and 6 are provided for the gap in an emergency.
A deployment mechanism (not shown) is provided so as to be opened in preference to 2.

The wind selecting mechanism 1 includes a compressed air fan 16 for sucking the atmosphere,
It consists of a dust-exhausting fan 17, and a wind-separating part 18 for sliding-down rice and a wind-selecting part 19 for brown-rice, which are provided between the two fans 16, 17, and the wind-selecting part 18 for sliding-down rice is the paddy-sheathed rice. It is located just below the machine 2 and selects rice husks from the scrapped rice after removal by wind. The scraped rice after the wind is rotated from the scraped rice gutter 20 with the spiral conveyor 21 to the bucket conveyor 22 by the rotation. The unbrown rice wind-selecting unit 19 is for further finishing wind-selecting the unpolished rice selected by the rotary sorting mechanism 3, and the finished unpolished rice after wind-selection has a spiral conveyor. Brown rice gutter 23 to bucket conveyor 24
Is taken out of the plane.

In this case, the rate of falling rice is detected in the sliding rice wind selecting unit 18 or in the middle of the sliding rice conveying route from the sliding rice wind selecting unit 18 to the rotary sorting mechanism 3. A desorption rate sensor 25 is provided for this purpose, and power is transmitted from the derolling rolls 6 and 7 to the spiral conveyors 21, bucket conveyors 22 and 24, and fans 16 and 17.

On the other hand, the rotary type sorting mechanism 3 is provided with a rotary type sorting cylinder 27 which is horizontally installed in a box-shaped case 26 in two upper and lower stages.
27 are each rotatably supported by a rotator 29 attached to a shaft 28 horizontally mounted in the box-shaped case 26.
By being connected to both the derolling rolls 6 and 7 via a continuously variable transmission mechanism 30, both sorting cylinders 27 are configured to be rotationally driven in the direction indicated by an arrow A in FIG.

Both of the sorting cylinders 27 have one end farther from the grain huller 2 on the supply side 27a and the other end closer to the grain huller 2 on the discharge side 27b, and have brown rice on their inner surfaces. A large number of recesses 31 each having a size to fit with are formed.

Further, in both of the sorting cylinders 27, brown rice gutters 32 with a spiral conveyor are provided, and slide rice gutters 33 with a spiral conveyor are juxtaposed adjacent to the brown rice gutters 32. .

The scraped rice sent from the bucket conveyor 22 is
Amounts of the rice, which are approximately equal to each other, are supplied to the both sides of the falling rice gutter 33 through the chute 34, and are supplied to the supply side 27a in the sorting cylinder 27 by the both sides of the falling rice gutter 33, while both brown rice gutters 32 The brown rice that has entered the inside merges with the chute 35 and then drops into the brown rice wind selecting section 19.

In addition, the discharge sides 27b of both the sorting cylinders 27 are provided with a plurality of paddy-raising blades 36 on their inner surfaces, and a paddy-returning chute 37 is mounted between the paddy-feeding hopper 5 of the paddy-gripping machine 2. The paddy is configured to flow back to the paddy supply hopper 5.

Reference numeral 38 is the ammeter 14 and the detachment rate sensor.
This is an electronic control device for appropriately operating the gap adjusting mechanism actuator 11 by inputting a signal from 25 or the like.

As will be described in the following embodiment, the electronic control unit 38 controls the two derolling rolls 6 and 7 so that the detected desorption rate B detected by the desorption rate sensor 25 becomes equal to a preset target desorption rate Bo. When the sensor type removal ratio control means for increasing or decreasing the gap and the detected removal ratio B do not change due to the operation of the two removal rolls 6 and 7 in the closing direction, both removal rolls 6,
7 Roll closing motion prohibiting means for prohibiting the operation of the gap in the closing direction is provided.

This will be described in detail with reference to the flow charts of the embodiments shown in FIGS. 4 and 5. In the flow chart of FIG. 4, the target desorption rate Bo set in advance in step S1 following the start and the load current of the de-motor 10 in step S2 are set. Then, the load current A is compared with the current Aa when the demotoring motor 10 is unloaded in step S3. If A> Aa is not satisfied, then the step A3 is performed.
Although it returns before S1, when A> Aa, it is determined in the next step S4 whether or not the automatic switch for the disengagement control is turned on, and when the automatic switch is not turned on, that is, when the manual disengagement rate control is performed. , The process proceeds to step S5, it is determined whether or not the expansion mechanism is operated here, and when the expansion mechanism is not operated, that is, when the expansion lever is closed, the escape rate detected by the escape rate sensor 25 in step S6. B is digitally displayed on the operation panel or the like, and when the expansion lever is opened, the process directly proceeds to steps S7 and S8, and then step S7.
Switch on to open the gap between both rolls 6 and 7
If this is set, the operation to open the gap between both derolling rolls 6 and 7 is performed in step S9, and
When the switch for closing the gap between 6 and 7 is turned on, the clearance ratio B digitally displayed on the operation panel and the like is brought close to the target clearance ratio Bo by performing the operation of closing the clearance between both rolls 6 and 7 in step S10. Both derolling like 6,
Manually control the 7 gap.

On the other hand, when the automatic switch for the disengagement control is turned on in step S4, it is determined in step S11 whether or not an X flag, which will be described later, is 1, and when X = 1, the deployment mechanism is operated in step S12. Whether or not the expansion mechanism is not operated again, that is, only when the expansion lever is closed, the process proceeds to the next step S13,
The load current A is compared with a value Ab (Ab = 0.9 × Amax) which is, for example, 90% of the limit current Amax (current value when the breaker provided for the demotor 10 operates) in the demotor 10 is compared with A When not Ab, that is, when the load current A exceeds the Ab and is close to the limit current Amax, the load current A does not exceed the Ab by opening the gap between the two derolling rolls 6 and 7 in step S14. On the other hand, when A <Ab,
That is, when the load current A has a margin with respect to the limit current Amax, the load current A is changed to the motor 1 in step S15.
When compared with a value Ac (Ac = 0.8 × Amax) which is, for example, 80% of the limit current Amax at 0, when A> Ac is not satisfied,
In step S16, the load current A is controlled to exceed Ac by closing the gap between the two derolling rolls 6 and 7, and if A is located between Ab and Ac, step S1
After setting the X flag to 1 in step 7, the process returns to the step before step S4.

In this way, the load current A becomes the limit current Amax.
Value Ab which is 90%, for example, and 80% of the limit current Amax
When it is controlled so as to be positioned between the value Ac and the value Ac, the process proceeds from step S11 to steps S18 and S19 to start the time measurement of the time T, and in the next step S20, the Y flag described later is 1 It is determined whether or not there is an appropriate time T2 (eg 10 seconds) in step S21 when Y = 1, and an appropriate time T1 (eg 5 seconds) in step S22 when Y = 1. After that, in step S23, the above-mentioned time measurement is stopped, and in step S24, the removal rate B of the declining rice is read in again, and in step S25, the load current A is read again, and then the sensor type automatic removal rate control of step S26 described below. To move to.

This sensor type automatic removal rate control is performed according to the flowchart shown in FIG.

That is, it is determined again in step S26a in FIG. 5 whether or not the Y flag is 1, and when Y = 1 is not satisfied, the withdrawal rate B is increased by an appropriate value β higher than the target withdrawal rate Bo (Bo + β) in step S26b. ), When B <Bo + β is not established, the clearance between the two derolling rolls 6 and 7 is opened in step S26c, but when B <Bo + β, the removal rate B is lower than the target removal rate Bo by an appropriate value β in step S26d. Compared with the value (Bo-β), if B> Bo-β is not satisfied, the load current A is compared with the limit current Amax in step S26e, and if A> Amax is not satisfied, the roll gap is closed in step S26f. When A> Amax, step S2
By opening the roll gap with 6g, the load current A is prevented from exceeding the limit current Amax, whereby the desorption rate B is set to the above value under the condition that the load current A does not exceed the limit current Amax. It can be automatically controlled to fall within a relatively wide range between Bo + β and Bo−β.

In this way, when the removal rate B is controlled so as to fall within a relatively wide range between Bo + β and Bo−β, the Y flag is set to 1 in step S26h, whereby the steps S26a to S26i. And move out to B
Is within a narrower range than the above, that is, Bo + α and Bo−α
It is automatically controlled so that it can enter between. However, |
α | <| β |.

First, in step S26i, the removal rate B is compared with Bo + α. If B <Bo + α is not satisfied, the roll clearance is opened in step S26j to set the removal rate B to the target removal rate Bo.
However, when B <Bo + α, the next step S2
At 6k, the escape rate B and Bo-α are compared. When B> Bo-α, the Z1 flag and the Z2 flag, which will be described later, are zeroed in step S26l and the process returns, but B> Bo-
When it is not α, in step S26m, the load current A and the limit current Amax are compared, and when A> Amax,
By opening the roll gap in step S26n, the load current A is prevented from exceeding the limit current Amax, while A> Amax
If it is not, it is determined whether or not the Z1 flag is 1 in step S26o, and if Z1 = 1, the process returns as it is. The target escape rate Bo
Then, it is determined again in step S26q whether or not the Z1 flag is 1, and if Z1 = 1 is not satisfied, step S26r
Then, the Z2 flag is set to 1, the Z1 = 1 is set in step S26s, and the Z1 flag is set to 1. Then, the process returns.

As a result, the desorption rate B is changed so that the load current A becomes the limit current Amax.
Under the condition of not exceeding, the automatic control can be performed so as to fall within the narrow width range between Bo + α and Bo−α, while the gap between the two derolling rolls 6 and 7 is controlled during this control. When the removal rate B does not change even if it is operated in the closing direction, the presence of the Z1 flag and the Z2 flag causes the process to directly return from yes in step S26o,
The closing operation of the roll gap in the step S26p is prohibited.

In the float chart, the X flag indicates that the load current A is once smaller than the limit current Amax (Ab to A).
It is used to memorize whether or not it has been controlled to become c), and the Y flag temporarily sets the removal rate B to Bo + β.
It is used to memorize whether or not it has been controlled to enter into Bo-β, and the Z1 flag indicates whether or not the action of closing the gap between the derolling rolls 6 and 7 has been performed twice. Is used to store the
It is used to determine the Z1 flag, and is used to store whether or not the action of closing the gap between the derolling rolls 6 and 7 has been performed once.

[Brief description of drawings]

1 shows an embodiment of the present invention, FIG. 1 is an enlarged vertical front view of a hulling machine, FIG. 2 is a vertical front view of a hulling and sorting device, and FIG. 3 is an enlarged sectional view taken along line III-III of FIG. , FIG. 4 and FIG. 5 are views showing flow sheets for the removal rate control. 2 ... Hulling machine, 5 ... Paddy feeding hopper, 6,7 ... Derolling, 10 ... Demotoring, 11 ... Actuator, 12 ...
Gap adjustment mechanism, 14 ... Ammeter, 25 ... Desorption rate sensor,
38 …… Control device.

Claims (1)

(57) [Claims] 1. A pair of derolling devices and a mechanism for adjusting the gap between the derolling devices are provided, and the dewetting rate sensor detects the dewetting ratio of the scraped rice that has been shed by the derolling devices. In a hulling machine provided with a sensor type removal rate control means for increasing or decreasing the gap between the two removal rolls so that the detected removal rate is equal to or substantially equal to a preset target removal rate, in the hulling machine after the removal, Is provided with roll closing motion prohibiting means for prohibiting the actuation of the two ratio roll gaps in the closing direction when the removal ratio does not change due to the actuation of the two derolling gaps in the closing direction. Removal rate control device for huller.