JPS6227048A - Dehulling ratio controller of huller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a device for controlling the dehulling rate by adjusting the cole gap of a rice huller.

(Prior Art) When a hulling roll is used for a long time, the roll surface wears out, the gap between the rolls increases, and the dehulling rate decreases.

Furthermore, even if the roll gap is the same, the grain size differs depending on the type of grain, so the dehulling rate will also vary depending on the type of grain.

Therefore a certain prolapse? ! In order to continue grinding rice at a constant rate, the rotation axis of the hulling roll must be moved appropriately to adjust the gap between the rolls.

For this reason, conventional dehulling rate control detects the actual dehulling rate during hulling work, compares this with the target dehulling rate, and automatically adjusts the roll gap so that the deviation becomes zero. The device is known.

(Problem to be solved by the invention) By the way, the dehulling rate is detected by taking out the grains discharged from the hulling rolls to the sensor, so when the roll gap is changed, the resulting change in the dehulling rate is It appears in the detection results with a delay of the time it takes to extract the senna to the senna.

Therefore, when changing the roll gap, the roll gap may be changed excessively in the conventional case due to the delay in detection even though the actual demolition rate has already reached the target demolition rate. This has the disadvantage that the roll gap cannot be easily set at a constant value and that control takes a lot of time, since the roll gap has to be set to the target demolition rate while correcting such overshooting.

The present invention aims to improve such conventional drawbacks, and aims to correctly control the roll gap in a short time by avoiding excessive changes when changing the roll gap.

(Means for Solving the Problems) Therefore, in the present invention, the roll gap is changed based on the load of the hulling roll, not on the dehulling rate, which inevitably causes a time delay in detection. This is because the load can be detected immediately from the load current of the motor that rotates the roll, and there is no time delay.

The target value for how much the roll load should be increased or decreased is
It is determined in proportion to the difference between the actual de-schooling rate and the target de-schooling rate.

The structure of the present invention will be explained based on the functional block diagram shown in FIG. 1. Reference numeral 1 is a dehulling rate sensor that detects the dehulling rate by distinguishing between paddy and brown rice contained in the mixed grain after hulling.

Reference numeral 2 denotes a set demolition rate output means for outputting a signal corresponding to the set target value of the demolition rate, and this is connected to the demolition rate comparison means 3 together with the demolition rate sensor l.

A roll rotation motor M for rotating the hulling roll is provided, and based on the judgment signal of the dehulling rate comparison means 3, the current of the roll rotation motor M is proportional to the difference between the actual dehulling rate and its target value. A roll load target value determining means 4 is provided for determining a target value of .

Reference numeral 5 denotes roll load detection means for detecting the load current of the roll rotation motor M, and this and the roll load target value determination means 4
A roll load comparison means 6 is provided for comparing the Okayama force signal with the Okayama force signal, and a roll opening/closing motor m is driven so that the load current of the roll rotation motor M becomes equal to the target value based on the judgment signal of the comparison means 6. A motor control means 7 is provided.

(effect) The control procedure according to the present invention is as follows.

Get rid of If during hulling work! When the ratio increases or decreases and a difference occurs between the target value and the target value, the demolition rate comparison means 3 compares the outputs of the demolition rate sensor 1 and the set demolition rate output means 2, thereby adjusting the difference. Outputs a corresponding judgment signal.

Based on the determination signal B, the roll load target value determining means 4 determines a new target value for the load current of the roll rotation motor M that is proportional to the difference between the actual demolition rate and the target demolition rate.

Then, the actual load current detected by the roll load detection means 5 is compared with the new target load current, and the roll opening/closing motor m is driven to automatically adjust the roll gap so that the difference between the two becomes zero.

(Example) Next, the present invention will be explained in detail.

FIG. 2 is a front view of the main parts of the hulling machine, in which a pair of hulling rolls 20 and 21 are mounted parallel to each other, and the rotating shaft of one of the rolls 20 is supported by a rotating arm 22.

Then, by rotating the screw rod 23 screwed back into the swing arm 22 in the forward or reverse direction by the roll moving motor m, the swing arm 22 is turned left and right about its fulcrum 24, and the roll 20 is directed toward the other roll 21. Adjust the gap between the two rolls by moving them closer together or farther apart.

25 indicates a hopper that feeds grain into the nip between the rolls.

The dehulling rate sensor l shown in the block diagram of Figure 83 samples the mixed grains discharged from the huller, passes it between the photocoupler provided in the sensor, and uses the property that brown rice transmits light better than paddy to separate it from paddy. In addition to distinguishing between brown rice and brown rice, the dehulling rate is detected from the total number of grains sampled.

The set demolition rate output means 2 has a polyurethane switch, and when setting the target demolition rate to 90%, for example, the value 9 is set.
Outputs a voltage value corresponding to 0%.

The roll load detection means 5 includes a current transformer interposed in the power supply circuit of a roll rotation motor M (not shown) that rotates the rolls 20 and 21, and detects the roll load from the load current flowing through the motor M.

These demolition rate sensor 1, set demolition rate output means 2, and roll load detection means 5 are connected to a microcomputer 27 via an input interface 26, and a roll opening/closing motor m is connected to the output side of the microcomputer 27 via an output interface 28. Connect.

As shown in the functional block diagram in FIG. If the rate fluctuates and causes a difference from the target dropout rate,
A determination signal corresponding to the difference is output, and based on this determination signal, the roll load target value determining means 4, which is also built in the microcomputer 27, determines whether the actual deburring rate and the target deburring rate are determined. ! Determine a new target value for the load current of the roll rotation motor M that is proportional to the rate difference.

For example, when the target removal rate is 90% and the actual removal rate is 80%, the difference is 10%, which is large, so set the target value to a value that is a large increase in the current load current A, and also When the cell rate is 85%, the difference is 5%, which is small, so the target value is determined by slightly increasing the current load current A.

Even when the actual removal rate exceeds the target removal rate, the target value of the load current A is determined according to the difference.

In other words, if the correction amount of load current A is α (α is positive),
A new target value is determined so that when the difference between the actual school leaving rate and the target school leaving rate is large, α is also large, and when the difference is small, α is also small.

After determining the new target value of the load current of the roll rotation motor M in this way, the actual load current detected by the roll load detection means 5 is adjusted so that it becomes the new target value, that is, the difference between the two becomes zero. Then, the gap between the rolls 20 and 21 is adjusted by rotating the roll opening/closing motor m forward or reverse.

The above control procedure is shown in the flowchart of FIG.

In this way, when modifying the old target value of load current and determining a new one, instead of changing the correction α according to the difference between the actual de-walling rate and the target value, it is changed according to the difference. The same effect can be obtained by changing the length of the operating time t of the roll opening/closing motor m.

For example, when the target demolition rate is 80%, when the actual demolition rate is 80%, the normal rotation time of the roll opening/closing motor m is set to 3 seconds, and when the actual demolition rate is 85%, the normal rotation time of the roll opening/closing motor m is set to 3 seconds. If the normal rotation time is 1 second, the roll gap can be widened or slightly narrowed depending on the difference in the demolition rate, and since there is no difference in the roll gap, the target demolition rate can be quickly achieved. can be approached.

It goes without saying that even if the actual demolition rate is lower than the target demolition rate, the operating time t of the roll opening/closing motor m is adjusted in accordance with the difference.

The functional block diagram of the latter embodiment is shown in FIG. 5 shows motor operation time determining means for determining the operation time t.

Depending on the material, diameter, and grain type of the hulling rolls, even a slight change in the roll gap may cause a sudden change in the dehulling rate. In such cases, the actual dehulling rate and the target eIm The operating time t of the roll opening/closing motor m may be made constant regardless of the magnitude of the difference.

(Effect of the invention) In short, in the present invention, when the actual demolding rate does not match the target value and a difference occurs, when adjusting the roll gap to eliminate the difference, the roll rotation motor M is adjusted. The load current is changed by the correction amount α determined by the magnitude of the difference in the demolition rate, but since fluctuations in the load current of the roll rotation motor M can be immediately detected in conjunction with changes in the roll gap, the present invention According to the above, it is possible to avoid excessive control caused by a delay in detecting control results, and there is no overshoot when changing the roll gap, and the target value can be reached more quickly than the conventional control that approaches the target value while correcting overshoot. It can be settled.

In addition, in the present invention, the correction amount α is increased or decreased according to the size of the difference between the actual demolding rate and the target value, so there is no excess or deficiency in the amount of change in the roll gap, no hunting occurs, and the target value is achieved in a shorter time. This has the effect of correctly setting the deburring rate.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram of the present invention, FIG. 2 is a front view of main parts of a hulling machine according to an embodiment of the present invention, FIG. 3 is a block diagram of its control device, and FIG. 4 is a flowchart showing its control procedure. FIG. 5 is a functional block diagram of another embodiment.

Claims (1)

[Claims] A roll opening/closing motor that can be rotated forward and backward to adjust the roll gap by moving the rotation axis of the hulling roll, and a system that detects the dehulling rate by identifying paddy and brown rice contained in the mixed grains after hulling. An escape rate sensor, a set escape rate output means for outputting a signal corresponding to a set target value of escape rate, and an escape rate output means for comparing both output signals of the escape rate sensor and the set escape rate output means. ■Rate comparison means, and roll load target value determination for determining a target value of the load current of the roll rotation motor in proportion to the difference between the actual removal rate and its target value based on the judgment signal of the removal rate comparison means. roll load detection means for detecting the load current of the roll rotation motor; roll load comparison means for comparing both output signals of the roll load target value determination means and the roll load detection means; and the roll load comparison means. A roll opening/closing motor control device for driving a roll opening/closing motor so that the load current of the roll rotating motor becomes equal to a target value based on a determination signal of the above.