JPH0257988B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an automatic gap adjustment method for hulling rolls.

(Prior art) The pair of left and right hulling rubber rolls of the hulling machine are adjusted to the designed roll gap (the rolls do not come into direct contact with each other, but face each other with a slight gap) before use. However, the gap adjustment is generally adjusted by the feeling of the operator.

However, many devices capable of automatic adjustment have been proposed and some have been put into practice.

For example, the one described in Japanese Patent Application Laid-Open No. 56-91851 falls under this category.

That is, in the known example, when a newly manufactured rice hulling device is installed in a factory, the current value of the main motor in a no-load state is measured before hulling operation. The measured value is assumed not to change in the future and is registered as a reference setting signal of the setting device. On the other hand, before each start of work, the current value of the main motor in a no-load state is measured using a current transformer (motor current detection device).

Next, the current value is compared with the standard setting signal of , and if the current value is less than the standard setting signal of , it is determined that the rolls are in contact, and the rolls are moved in the direction of separating them. When the current value reaches the reference setting signal>, it is determined that the rolls are separated from each other more than necessary, and the rolls are moved in the direction of contact.

(Problem to be Solved by the Invention) The above-mentioned known example has a fundamental problem in that the reference setting signal is assumed to continue without changing.

For example, since the power supply voltage in a factory changes all the time, the reference setting signal must also change accordingly, but this cannot be accommodated.
Furthermore, if the belt, which is a transmission device, loosens even a little, the reference setting signal must naturally change, but this cannot be accommodated.

Generally, the setting device uses an IC memory or a variable volume, but in the case of an IC memory, the current value of a large number of products in the no-load state is determined, and the average value of these is used as the reference setting signal. Since the information is uniformly stored in the IC memory, it cannot respond to changes in the power supply voltage of the factory.

In the case of variable volume, unlike IC memory, it is necessary to actually operate the removal device at the installation location.
The current value of the main motor in a no-load state is measured, but since the measured value changes endlessly due to changes in the mechanical resistance of the drive system of the removal device, etc., it cannot be accommodated.

Therefore, the present invention changes the idea that the reference setting signal does not change, and automatically adjusts it based on the idea that the reference setting signal changes.

(Method for Solving the Problem) Therefore, the present invention provides: a. A current value during no-load operation of a motor that drives a pair of opposing hulling rolls is measured by a motor current detection device.

b. Are the hulling rolls in contact with each other?
Alternatively, regardless of whether the rolls are separated, the rolls are moved only once by a predetermined amount F in the direction of closing the roll gap.

c After the operation in b above, the motor current is measured with a motor current detection device, and if it increases compared to the measured value in a above, it is determined that there is contact with the hulling roll, and the measured value decreases by a predetermined amount R. The hulling rolls are repeatedly moved in the direction of separating them until there is no change.

d If the measured value of the motor current detection device after the operation in b above does not change from the measured value in a above, it is determined that the hulling roll is not in contact, and the roll gap is repeatedly increased by a certain amount F. Move it in the closing direction.

e When the measured value of the motor current detection device increases as a result of the operation in step d above, it is determined that the hulling roll is in contact, and the hulling roll is separated by a fixed amount R until the measured value decreases and stops changing. Move repeatedly in the direction you want.

This is an automatic gap adjustment method for hulling rolls.

(Example) To explain with the drawings, Fig. 4 shows an example in which the rolls can be adjusted and moved, 1 is a fixed hulling roll, 2 is a movable hulling roll, and the fixed hulling roll 1 and the movable hulling roll 2 are driven by a motor. It is rotated by

The movable hulling roll 2 is fixed by a shaft 5 at an intermediate position between the upper and lower sides of a swinging arm 4 whose lower end is fixed to the case by a shaft 3.

A top 6 is attached to the upper end of the swinging arm 4 above the position of the shaft 5, and a threaded portion 8 formed at the tip of a screw rod 7 is screwed into the top 6. The opposite side of the threaded portion 8 of the screw rod 7 is a base portion 9, which protrudes outward from a through hole 10a formed in the case 10.

A spring receiving plate 26 is provided on the front side of the through hole 10a, and a bearing 11 is attached to the spring receiving plate 26.
The screw rod 7 is fixed by the screw rod 7.

A pin 12 is passed through the end of the screw rod 7 so as to be perpendicular to the base 9. Reference numeral 13 denotes a flange fitted to the outside of the end of the base 9, and is fixed to the base 9 with the pin 12.

As described above, the base 9 of the screw rod 7 protrudes from the through hole 10a of the case 10, and a cylindrical body 27 is formed on the outer periphery of the base 9, and is mounted inside the cylindrical body 27.

The collar portion 13 attached to the base portion 9 of the screw rod 7
A compression coil spring 14 is interposed between the cylindrical body 27 and the bottom of the cylindrical body 27 of the case 10, and the compression coil spring 14 presses the flange 13 to the left in FIG. Force it to move to the left.

A considerably large gap is formed between the outer circumferential surface of the compression coil spring 14 and the inner circumferential surface of the cylindrical body 27, and the inner cylinder 15 is provided in this gap.

The inner cylinder 15 is formed long in the axial direction of the screw rod 7, and a manual rotation handle 16 is attached to its outer end. Several protrusions 17 are provided in the axial direction on the inner surface of the inner cylinder 15, and the tip of the pin 12 engages with the protrusions 17.
A gear 18 is provided in the inner cylinder 15, a gear 19 meshes with the gear 18, and the gear 19 is fixed to a rotating shaft 21 of a forward/reverse rotation motor 20.

The forward/reverse rotation motor 20 is rotated in the forward/reverse direction by a forward/reverse device 22 . 23 is a supply port, 24 is a feeding roll, and 25 is a control valve. Therefore, the collar 28 is located at the portion where the bearing 11 is located.
will be provided. The collar 28 is attached to the screw rod 7 by welding, and the collar 28 is attached to the bearing 11.
The screw rod 7 stops when a part thereof fits into the center gap and comes into contact with the center gap. The contact surface of the collar 28 is
It is formed on a tapered surface 29 or a rounded surface (arc surface).

FIG. 5 is a block circuit diagram, in which 30 is a roll gap closing relay, 31 is a roll gap opening relay,
32 and 33 are AND gates, 34 is an inverter (NOT circuit), 35 is a central control unit, 36 is a motor current detection device, 37 is an analog multiplexer, 38 is a comparator, and 39 is a D/A converter.

(effect) Next, we will discuss the effect.

(Measurement of motor current value) When a signal specifying the motor current detection device 36 of "7" is output from P2 of the central control unit 35 shown in FIG. 5 to the analog multiplexer 37,
The detected value of the motor current detection device 36 is detected by the comparator 38.
is output to one side of the On the other hand, P3 and 4 are D/A
A comparison signal whose value changes continuously is outputted to the other side of the comparator 38 via the converter 39.

Thereby, the comparator 38 compares the comparison signal and the detection value, and sends the result to the central control unit 35.
P5, and the central control unit 35 measures the motor current value.

(Roll gap closing adjustment/F amount) “H” in bit 0 of P8 in Fig. 5, bit 0 of P1
When "H" is output to , the AND gate 32 outputs an output, and the AND gate 33 does not operate due to the action of the inverter 34 . Therefore, the roll gap closing relay 30 is activated, and the motor 20 rotates in the forward direction.
The gap between the rolls is closing. At the same time, the internal timer of the central control unit 35 is started, and after a certain period of time has elapsed, that is, after the roll gap has been closed by a certain amount F (arbitrary small amount), bit 0 of P8 is set to "L".
Set bit 0 of P1 to "L" and stop the motor 20.

(Roll gap opening adjustment/R amount) “L” in bit 0 of P8, “H” in bit 0 of P1
When , the AND gate 32 does not operate and the AND gate 33 outputs an output due to the action of the inverter 34 . Therefore, the roll gap opening relay 3
1 is activated, the motor 20 rotates in reverse, and the roll gap becomes wider and wider. At the same time, the internal timer of the central control unit 35 is started, and after a certain period of time has elapsed, that is, after the roll gap has opened by a certain amount R (arbitrary small amount), bit 0 of P8 is set to "H", and bit 0 of P1 is set to "H". Bit 0 is set to "L" and the motor 20 is stopped.

(Overall operation) With the above basic movement in mind, actual roll adjustment will be explained.

The current value during no-load operation of the motor that rotates the fixed hulling roll 1 and the movable hulling roll 2 is measured by a current detection device.

Regardless of whether the rolls 1 and 2 are open as shown in Fig. 2 or in contact as shown in Fig. 3, the rollers 1 and 2 are moved once in the direction of closing the gap between the rolls by a certain amount F. , and then measure the motor current value again.

Then, in the case of Fig. 2, the current value changes from Fig. 2 A to Fig. 2 B, but since the roll is still in a non-contact state even in the state of Fig. 2 B, the current value is the same as the initial no-load current value. be.

In this way, when the measured value does not change, it is determined that the roll is not in contact, and as shown in FIG. This can be repeated until the measured value changes (increases).

If the measured value increases, the rolls are in contact as shown in Figure 2 (c), so next time, rotate the motor 20 in reverse to separate the rolls by a certain amount R, and measure the motor current value. ,compare. This separation is repeated until the measured values no longer change as shown in FIG. 2 (E) to (E).

In addition, when rolls 1 and 2 are in contact from the beginning as shown in Figure 3, when the rolls are moved in the direction of closing by the amount F, they close strongly as shown in Figure 3 B, and the measured value immediately increases. Therefore, from now on, it is only necessary to sequentially separate the rolls by the amount R as in the case of FIG. 2.

(Effect) In the known example, the reference setting signal is adjusted as if it were to continue without changing. For example, since the power supply voltage in a factory changes all the time, the reference setting signal naturally does not change. Even though it shouldn't happen, I can't deal with it. Furthermore, if the belt, which is a transmission device, loosens even a little, the reference setting signal must naturally change, but this cannot be accommodated.

However, in the present invention, the current value during no-load operation of the motor that drives a pair of opposing hulling rolls is measured using a motor current detection device.

b. Are the hulling rolls in contact with each other?
Alternatively, regardless of whether the rolls are separated, the rolls are moved only once by a predetermined amount F in the direction of closing the roll gap.

c After the operation in b above, the motor current is measured with a motor current detection device, and if it increases compared to the measured value in a above, it is determined that there is contact with the hulling roll, and the measured value decreases by a predetermined amount R. The hulling rolls are repeatedly moved in the direction of separating them until there is no change.

d If the measured value of the motor current detection device after the operation in b above does not change from the measured value in a above, it is determined that the hulling roll is not in contact, and the roll gap is repeatedly increased by a certain amount F. Move it in the closing direction.

e When the measured value of the motor current detection device increases as a result of the operation in step d above, it is determined that the hulling roll is in contact, and the hulling roll is separated by a fixed amount R until the measured value decreases and stops changing. Move repeatedly in the direction you want.

Since this is an automatic gap adjustment method for hulling rolls, for example, it can cope with changes in the factory power supply voltage.

(b) Also, even if the resistance value of the transmission device changes, it can be accommodated.

This effect is achieved.

[Brief explanation of drawings]

Figure 1 is a flowchart for adjusting the roll gap.
Figure 2 is an adjustment state diagram with the roll open.
Figure 3 is an adjustment state diagram with the roll closed.
FIG. 4 is a sectional view of the main part, and FIG. 5 is a circuit diagram. Explanation of symbols: 1... Fixed hulling roll, 2... Moving hulling roll, 3... Shaft, 4... Swinging arm, 5...
Shaft, 6...piece, 7...screw rod, 8...screw part, 9
...Base, 10...Case, 10a...Through hole, 1
1...bearing, 12...pin, 13...flange, 14...compression coil spring, 15...inner cylinder, 1
6...Manual rotating handle, 17...Protrusion, 18...
...gear, 9...gear, 20...forward/reverse motor,
21... Rotating shaft, 22... Forward/reverse device, 23...
Supply port, 24... Feeding roll, 25... Control valve, 26... Spring receiving plate, 27... Cylindrical body, 2
8... Collar, 29... Tapered surface, 30... Roll gap closing relay, 31... Roll gap opening relay, 32, 33... AND gate, 34... Inverter (NOT circuit), 35... Center control unit,
36... Motor current detection device, 37... Analog multiplexer, 38... Comparator, 39...
D/A converter.

Claims (1)

[Claims] 1. An automatic gap adjustment method for hulling rolls as described below. a. Measure the current value of the motor that drives a pair of opposing hulling rolls during no-load operation using a motor current detection device. b. Are the hulling rolls in contact with each other?
Alternatively, regardless of whether the rolls are separated, the rolls are moved only once by a predetermined amount F in the direction of closing the roll gap. c After the operation in b above, the motor current is measured with a motor current detection device, and if it increases compared to the measured value in a above, it is determined that there is contact with the hulling roll, and the measured value decreases by a predetermined amount R. The hulling rolls are repeatedly moved in the direction of separating them until there is no change. d If the measured value of the motor current detection device after the operation in b above does not change from the measured value in a above, it is determined that the hulling roll is not in contact, and the roll gap is repeatedly increased by a certain amount F. Move it in the closing direction. e When the measured value of the motor current detection device increases as a result of the operation in step d above, it is determined that the hulling roll is in contact, and the hulling roll is separated by a fixed amount R until the measured value decreases and stops changing. Move repeatedly in the direction you want.