JPH03217246A - Controlling method for roll gap in test huller - Google Patents

Abstract

PURPOSE:To perform control of a roll gap suitable for a test huller by sending a command to a controlling motor from a controlling circuit in a no-load state and controlling the roll gap by the controlling motor and correcting the roll gap so that measured current value is allowed to coincide with the preset current value. CONSTITUTION:A proximity switch S which detects presence of paddy supplied to a fixed roll 1 and a movable roll 2, a controlling motor (m) for controlling a roll gap and a current measuring instrument for measuring the current value of a driving motor M are provided. The proximity switch S, the controlling motor (m) and the current measuring instrument are electrically connected via a controlling circuit 3. The switch S is turned on by detection of 'presence' of paddy. The measured current value of the motor M due to the current measuring instrument is compared with the preset current value of the motor M which is inputted in the controlling circuit 3 and matched with the proper roll gap. The switch S is turned off by detection of 'nonpresence' of paddy due to pass thereof. Automatic control of the roll gap is performed via the controlling motor (m) on the basis of the difference of current value of both.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial application field The present invention relates to a test huller which has a fixed roll and a moving roll installed opposite each other, and which feeds and deweighs a certain amount of paddy between the two rolls. This relates to a control method.

(B) Conventional technology As described in Japanese Patent Publication No. 15026/1983, as a method for controlling the gap between rolls in a conventional weighing machine,
There is a known method in which a movable roll is joined to a fixed roll at the start of operation of a descaling machine, and then the gap between the rolls is opened by a predetermined gap, so that a predetermined deweighing action is obtained immediately from the start of descaling.

(c) Problem to be solved by the invention However, in the method of controlling the roll gap as described in the above-mentioned publication, the state of hulling varies greatly depending on the conditions of the grain to be scaled. Although it has advantages as described in , it also has disadvantages.

Therefore, in view of the coexistence of advantages and disadvantages in such conventional techniques, the present invention provides a roll gap control method suitable for a test huller that feeds a certain amount of paddy between the rolls to dehull it. There is something that says.

(2) Means for Solving the Problem Therefore, the present invention provides a roll gap control method suitable for a test huller from the above-mentioned viewpoint, in which a fixed roll and a moving roll are disposed opposite each other, and a constant distance between the two rolls is provided. A test hull that supplies and weighs a certain amount of paddy is equipped with a proximity switch that detects the presence or absence of paddy supplied to the rolls, and a current measuring device that measures the current value of the control motor and drive motor that adjust the roll gap. , the proximity switch, the control meter, and the current measuring device are electrically connected through a control circuit, and when the proximity switch detects the presence of paddy, the proximity switch is turned ON, and the current value measured by the current measuring device and the current measuring device of the drive motor is controlled. Compare the set current value of the drive motor according to the appropriate roll gap input to the circuit, and based on the difference between the two current values, the control motor is turned OFF when the proximity switch detects "no" paddy as the paddy passes through. The roll gap is automatically controlled via the roller.

(E) Function In this test huller, a fixed amount of paddy is fed between a fixed roll and a moving roll, and each lot of paddy is unhusked. When the proximity switch detects the presence of paddy to be supplied to the tank, the proximity switch turns on, measures and stores the current value of the drive motor under load using a current measuring device, and stores this measured current value and the control circuit in advance. Compare the set current value of the drive motor according to the proper roll gap that has been input and stored, and if the two current values are different, the proximity switch will be turned off due to the passage of that certain amount of paddy. is detected and turned off, and in a no-load state, the control circuit issues a command to the control motor, the control motor controls the roll gap, and the measured current value is corrected to match the set current value.

(f) Example Hereinafter, the roll gap control method according to the present invention will be explained with reference to the drawings.

First, in Fig. 1, (1) is a fixed roll, (2) is a movable roll installed opposite to this, and is swingably supported by an arm (4). The roll gap can be adjusted by moving the roll closer to or away from the fixed roll (1) by screwing them together.

(6) is a paddy funnel that accommodates a certain amount of paddy, (7) is a paddy supply path that connects this paddy funnel (6) and rolls (1.) and (2), (8) is a suction fan, and (1) A suction air passage (9) communicates with the lower side of (2) to create a suction and sorting air for sorting the unclothed material, and (M) is connected to the belt (10) by a drive motor.
(11) Fixed roll (1) and moving roll (2) through
- The suction fan (8) and the outlet hole (12) are driven to rotate.

And (S) is a capacitance type proximity switch, which is attached to one side of the paddy supply path (7) and detects the presence of paddy by supplying paddy from the paddy funnel (6). , it is designed to detect "absence" of paddy by passing the paddy and turn off.

(13) is a control box containing a control circuit (3), and a current measuring device that is incorporated into the proximity switch (S) and the control circuit (3) to measure the current value of the drive motor (M), and a control motor. (nt) are electrically connected via this control circuit (3).

Furthermore, the relationship between the detection of paddy by the proximity switch (S) and the current measurement when the drive motor (M) is loaded is described in Fig. 2. The dotted line indicates the number of times when a certain amount of paddy is rubbed once in one lot. The characteristic curve (A) is shown, and the solid line shows the characteristic curve (IIJ) for two-time printing.

In other words, since the entire amount of paddy is weighed once, the time required from the start of unweighing (P) to the end of unweighing (R) is approximately lθ.
The current value during that period is approximately averaged. However, in the case of two-time printing, since brown rice accounts for about 90% of the grain, the current value suddenly increases immediately after the start of shedding (P).

Therefore, the current value of the drive motor (M) is measured (Q) for a certain period of time (T) from the time of paddy detection (0) of the proximity switch (S).
) Characteristic curves (A) and 2 for one printing with a delay of approximately 5 seconds.
A timer is interposed so that measurement is performed when the characteristic curves (b) during rotation substantially match.

Therefore, as shown in the flowchart of Fig. 3, this roll gap adjustment is performed when a certain amount of one lot of paddy stored in the paddy funnel (6) is supplied from the paddy funnel (6), The switch (S) detects the presence of paddy and starts unhulling, and after a certain time (T) delay from the detection of paddy by the proximity switch (S), the current value of the drive motor (M) under load is measured. and this measured current value is stored. A set current value corresponding to the appropriate roll gap is input to the control circuit (3) and is compared with the measured current value. If there is a difference as a result of the comparison, the proximity switch (S) is turned OFF due to the detection of "no" paddy. When the deweighing is completed, a command is issued from the control circuit (3) to the control motor (m) to adjust the roll gap by one step,
By repeating the l-step adjustment, the measured current value becomes equal to the set current value.

What is shown in Fig. 4 shows the case where the measured current value in this case is larger than the set current value, and by repeating sequentially from 1 lot to 2 lots, the roll gap is adjusted step by step. An example is shown in which the roll gap is modified in accordance with the set current value.

In addition, FIGS. 5 and 6 show the means for installing the proximity switch (S). The proximity switch (S) is attached by a clamping plate (14) with a notch that spans the detection part (S1) of (S), and the detection surface (S2) of the detection part (S1) and the clamping plate (l4) It is made to be on the same surface.

(G) Effects of the Invention As explained above, the present invention provides a test huller in which a fixed roll and a moving roll are disposed opposite each other, and a fixed amount of paddy is fed between the two rolls for deweighing. a proximity switch that detects the presence or absence of paddy; and a current measuring device that measures the current value of a control motor that adjusts the roll gap and a drive motor; The proximity switch is electrically connected and turned on when the presence of paddy is detected, and the current value of the drive motor is measured by the current measuring device and the set current value of the drive motor is adjusted to the appropriate roll gap input to the control circuit. Based on the difference in the current value between the two rolls, the distance between the rolls is automatically controlled via the control motor by turning off the proximity switch when the paddy is detected to be "absent" as the paddy passes through. The roll gap is adjusted so that the dehulling pressure does not change even when the grain is worn, and a uniform deweighing rate is obtained, making this roll gap control method suitable for a test huller that feeds and deweighs a fixed amount of paddy. Also, it is not worth performing maintenance and inspection until the rolls are completely worn out.

[Brief explanation of drawings]

The drawings show the roll gap control method according to the present invention, and Fig. 1 is a longitudinal cross-sectional side view of the entire test huller, and Fig. 2 is for explaining the relationship between paddy detection by the proximity switch and current measurement of the drive motor. Figure 3 is a flowchart for adjusting the roll gap, Figure 4 is an explanatory diagram of the process of matching the measured current value with the set current value, Figure 5 is a sectional view of the proximity switch section, and Figure 6 is a flowchart for adjusting the roll gap. This is a perspective view with the proximity switch removed. ■... Fixed roll 2... Moving roll S...
Proximity switch m...Control motor M...Drive motor 3...Control circuit Q...When measuring current value 0
...When paddy "presence" is detected T...certain time

Claims (1)

[Claims] 1) A fixed roll (1) and a movable roll (2) are installed opposite each other, and a certain amount of paddy is supplied between these rolls (1) and (2) to remove the rice.
In the test huller, there are a proximity switch (S) that detects the presence or absence of paddy supplied to the rolls (1) and (2), a control motor (m) and a drive motor (M) that adjust the roll gap.
the proximity switch (S), the control motor (m), and the current measurement device are electrically connected via a control circuit (3);
) is turned ON when the presence of paddy is detected, and the current value of the drive motor (M) is measured by the current measuring device and the set current of the drive motor (M) is adjusted to match the appropriate roll gap input to the control circuit (3). The roll gap is automatically controlled via the control motor (m) by turning off the proximity switch (S) when the paddy is detected to be "absent" when the paddy passes through, based on the difference between the two current values. A roll gap control method in a test huller characterized by: 2) The current value of the drive motor (M) is measured (Q) for a certain period of time (Q) from when the proximity switch (S) detects the presence of paddy (0).
T) Claim 1 characterized in that it is delayed.
Roll gap control method in the test huller described in Section 3.