JPH09103690A - Controller for unhulled-rice hulling and selecting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out rough-rice-hulling operation smoothly by reducing interraption of operations owing to overload even in the case of unhulled rice which is easy to flow into a roller for hulling rice. SOLUTION: A pair of rollers for hulling rice are driven with a main motor capable of being controlled with an inverter 25a. A gap between rollers for hulling rice is controlled based on an overload current value reference, torque reduction control wherein ON time of unit frequency by the inverter 25a is reduced is carried out in relation to detection of overload of the main motor with a load current sensor 32. Then, control of the frequency with the inverter 25a is carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a roll clearance control device for a hulling roll.

[0002]

2. Description of the Related Art A roll clearance control device for a hull roll is known, which controls a roll clearance between a pair of hull rolls on the basis of a load current value or a removal rate.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention When carrying out hulling work with the roll clearance control device of the hulling roll, the flow into the hulling roll depending on the kind of the hull or old and new hulls. In the case of paddy with different conditions and a large amount of inflow, the load of the paddy roll increases at the beginning of the paddy work, resulting in overload,
Hulling work may not be possible.

Therefore, the present invention intends to smoothly carry out the hulling work by eliminating the above-mentioned overload state and without interrupting the hulling work, or while reducing the work interruption.

[0005]

The technical means of the present invention for solving such a technical problem is a pair of hulling rolls.
Main motor 44 which can be controlled by the inverters 3 and 3 and the inverter 25a and drives the hulling rolls 3 and 3, and a load current sensor 32 which detects a load current value of the main motor 44. A roll gap control means for controlling the opening / closing of the gap between the hulling rolls 3 and 3 on the basis of a load current value reference or a removal rate reference; and a unit related to overload detection of the load current sensor 32. The control device of the hull sorting machine includes the torque reduction control means for shortening the ON time of the frequency and the frequency control means for changing the frequency that operates after the operation of the torque reduction control means is completed.

[0006]

When the paddy is supplied to the paddy rolls 3 and 3 and the paddying work is started, the gap between the paddy rolls 3 and 3 is controlled by the load current value standard or the removal rate standard. While hulling work is performed. During such automatic control operation, the load current sensor 32 detects the load current value of the main motor 44 and compares it with the reference overload current value, and the detected load current value exceeds the reference overload current value. Sometimes, the torque reduction correction is performed by shortening the ON time of the unit frequency, and when the detected load current value becomes equal to or less than the reference overload current value, then the frequency control of the inverter is performed and the detected frequency becomes the reference frequency. Control to return is performed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention shown in the drawings will be described below. First, the configuration of the embodiment will be described. First, the overall configuration of a hulling and sorting machine will be described with reference to FIG. Reference numeral 1 denotes a hulling unit. The hulling unit 1 includes a hulling hopper 2, a pair of hulling rolls 3, 3, and the like. Reference numeral 4 is a sludge removal unit, in which the sludge from the rice hull portion 1 is wind-selected by the sorting wind generated by the suction dust collector 5 in front, and the light rice husk is sucked by the suction dust collector 5, dust removal. The heavy brown rice and the mixed rice of paddy discharged through the tube 6 to the outside of the machine, and the mixed rice of the heavy brown rice and the paddy rice 7 below
To be sorted. The mixed rice dropped and sorted into the slide-down rice receiving gutter 7 is fried by the mixed rice fried machine 8 and is supplied to the conveyance start end portion of the supply gutter 14 on the rotary selection cylinder 11 side through the mixed rice hopper 9. It is a configuration.

Reference numeral 10 is a sorting case, and this sorting case 1
In 0, a rotary selection cylinder 11 having a large number of jar holes on its inner peripheral surface is arranged so that it rotates around the horizontal axis and its selection start side (right side in FIG. 1 (1)) and selection end side. (Fig. 1 (1)
The left side) is rotatably supported by drive rollers 12, 12, .... A supply gutter 14 supported by a supply spiral 13 and a brown rice gutter 16 supported by a brown rice helix 15 are horizontally suspended in the rotary sorting cylinder 11.

When arranging the supply gutter 14 and the brown rice gutter 16 in the rotary selection tube 11, as shown in FIG. 1 (2), the supply gutter 14 is placed on the scraping side of the rotary selection tube 11 and again. The brown rice gutter 16 is disposed on the side of the rotary selection cylinder 11 that rotates downward from above. In this supply gutter 14, the mixed rice of paddy and a part of brown rice scooped up low in the pot hole of the rotary selection cylinder 11 is dropped and sorted, and is further transferred by the supply spiral 13 to the conveying end side of the supply gutter 14. Rotating sorting cylinder 11
The supply gutter 14 also has a function of receiving mixed rice.

The end of the brown rice gutter 16 at the end of transportation is the brown rice falling tube 1
7. It is connected to brown rice gutter 19 through brown rice grain plate 18. The brown rice received by the brown rice gutter 16 is the brown rice falling tube 1
7. The brown rice is passed through the brown rice grain plate 18 and dropped into the brown rice gutter 19 to be selected by air, and is further taken out from the brown rice gutter 19 via the brown rice grain cultivator 20. Rotating sorting cylinder 1
Below the sorting end side of No. 1, a paddy gutter 21 is arranged. A paddy grain hopper 22 is connected to the paddy receiving trough 21, and an upper end of the paddy grain hopper 22 is connected to the paddy reducing hopper 23 of the paddy hull 1. Then, the grain mainly composed of the sorted paddy rice that has flowed to the sorting end side of the rotary sorting cylinder 11 is the paddy receiving gutter 21.
In addition, the grain is dropped to the grain hulling machine 1, the grain-reducing hopper 23, the grain is reduced to the grain-sliding unit 1, and the grain is again grained. It should be noted that the mixed rice sorting unit may be replaced with a rotary grain sorting device, and a swing sorting device type or other system may be used.

FIG. 2 shows a known roll gap control device for adjusting the gap between the hulling rolls 3 and 3. The hulling rolls 3 and 3 are a hulling roll 3 which rotates at a fixed position on the left side, and a right hulling roll 3 which is rotatably supported by a swing arm to be adjusted. It is composed of. Roll clearance control motor 45
Is rotated normally or reversely, the gap between the hulling rolls 3 is adjusted to be opened and closed by the roll gap adjusting means composed of a gear group, an adjusting screw rod, a swing arm, and the like. is there.

Next, FIGS. 3 to 5 will be described. C
The control unit 25 having a built-in PU is connected to the inverter 25a (a main circuit including a forward conversion device unit that converts alternating current to direct current, a reverse conversion device unit that converts direct current to alternating current, and a forward and reverse conversion device unit. Which is composed of a control circuit section), and the torque and frequency of the main motor 44 and various control motors can be changed to increase or decrease the rotational speed. During the hulling and sorting operation, the load current value of the main motor 44 is detected and controlled so as to rotate at the reference rotation speed. The CPU of the inverter 25a and the control unit 2
The CPU of 5 may be shared to be a single one.

A large number of switch groups are connected to the control section 25, and a large number of sensor groups are connected via a signal conversion circuit 36 which is an interface. To 25, a large number of actuator groups and a display device group are connected via an output interface. Next, these connection relationships will be specifically described.

The removal rate upper switch 26, the removal rate lower switch 27, the cylinder rotation high switch 28, and the cylinder rotation low switch 2
9, automatic / manual switch 3 to switch to automatic or manual
0, a load of detecting the load current value of the main motor 44, and a switch group of the display changeover switch 31 for switching and displaying the rotation speed of the rotation selection cylinder 11 and the detected load current value on the cylindrical rotation speed display device 50. Current sensor 32, power supply voltage sensor 33,
A power supply frequency sensor (R-T) 34, a sensor group of a power supply frequency sensor (S-T) 35, a grain sensor 37 for detecting the presence or absence of grains in the paddy hopper 2, and a hulling roll 3, 3
, A roll deployment sensor 38 for detecting a deployment state in which the roll gap is widely opened, a shutter sensor 39 for detecting a fully closed state of the paddy supply control valve 39a, a rotation sensor 40 for detecting the number of rotations of the rotary selection cylinder 11, A valve opening sensor 41 comprising a potentiometer for detecting the opening of the paddy supply control valve 39a,
A sensor group of a transistor-open collector type scattering sensor 42 for detecting the picked-up state of the grain in the rotary selection cylinder 11,
The run / stop switch 43 is connected to each of the control units 25 via the signal conversion circuit 36.

A roll for adjusting the roll clearance between the main motor 44 for driving the hull sorting machine and the hull rolls 3, 3 from the control section 25 via the signal conversion circuit 36. Gap adjustment mode
The motor 45, a shutter opening adjustment motor 46 for adjusting the opening of the paddy supply adjusting valve 39a, a cylindrical rotation adjusting motor 47 for adjusting the rotation speed of the rotary selection cylinder 11, and a communication device 48 are provided. It is connected. Further, the control unit 25 includes a display tube 49 for displaying characters, numbers, etc., a cylindrical rotation speed display device 50 for displaying the rotation speed of the rotation selection cylinder 11, current display LEDs 51, L.
The ED display device 52 and the buzzer 53 are connected to each other.

Next, the control panel 54 shown in FIG.
Will be described. The control panel 54 includes, for example, a fluorescent display tube type display tube 49 and a cylindrical rotation speed display device 5.
0, current display LED 51, display unit for displaying the presence or absence of paddy in the paddy hopper 2, shutter open / close display unit, roll expansion display unit, LED display unit 52a for displaying the presence or absence of abnormality, whether automatic operation or manual operation LED display section 52b for displaying
LED display 52c for displaying roll expansion, automatic / manual switch 30, take-off rate lower switch 27, take-off rate upper switch 26, cylindrical rotation low switch 29 for lowering and adjusting the number of rotations of the rotary selection cylinder 11, rotation Cylindrical rotation height switch 28 and display changeover switch 31 for increasing and adjusting the rotation speed of the selection cylinder 11.
However, it is provided for each husband and wife.

Next, the control contents of the CPU 25 will be described. First, the automatic / manual switch 30 is selected on the automatic side, and the run / stop switch 43 is operated on the run side. Then, the main motor 44 is turned on to drive the rotating parts of the paddy hull sorting machine. Next, the initial gap setting control for setting the initial gap between the hulling rolls 3 and 3 is performed. A roll gap opening command signal from the CPU 25 is output to the roll gap adjusting motor 45, and the roll gap adjusting means 24 is driven to open for a predetermined time.
When the clearance between the hulling rolls 3 is adjusted and the load current sensor 31 detects the non-contact state of the hulling roll in which the detected load current value does not change, the opening adjustment is stopped. Then,
A close command signal for the roll gap is output, the roll gap is closed and adjusted, and the load current sensor 32 detects an increase in the load current value.
When the slight contact between the hulling rolls 3 and 3 is confirmed, the closing adjustment is stopped. Then, an opening command signal for the roll gap is output, and the roll gap adjusting motor 45 is opened for a predetermined time.
The adjustment setting is made to a predetermined initial gap (for example, 1 mm). Next, the shutter opening initial setting control for adjusting the initial opening of the paddy supply adjusting valve 39a is performed. An open command signal is output from the CPU 25 to the shutter opening adjustment motor 46,
Set the paddy supply control valve 39a to a predetermined valve opening (for example, 10 mm)
The initial opening is set so that the hulling work is started. Next, a valve opening adjustment command signal for adjusting the supply amount adjustment setting position of a paddy supply adjusting lever (not shown) is output, and the paddy supply adjusting valve 39a is changed and adjusted to a position corresponding to the set efficiency valve opening. It

Then, the control shifts to the roll clearance control based on the load current value. Then, the detected load current value of the load current sensor 32 is sent to the control unit 25, and the control reference value and the detected load current value are compared. When the detected load current value is higher than the control reference value, the controller 25 outputs an open command signal to the roll gap adjusting motor 45 to adjust the gap between the hulling rolls 3 and 3 to the open side by a predetermined amount. If the detected load current value is lower than the control reference value, a closing command signal is output, the gap between the hulling rolls 3, 3 is closed by a predetermined amount, and the control returns to the control reference value. If the detected load current value is within the control reference value range, the control command signal is not issued,
Hulling work is performed while maintaining the roll gap as it is. Instead of the roll clearance adjustment control based on the load current value reference, the clearance control of the hulling roll based on the removal rate reference may be performed.

Next, the frequency control of the inverter 25a at the start of work will be described with reference to FIG. Paddy hopper 2
When the grain sensor 37 detects the presence of paddy and then the shutter sensor 39 detects the opening of the paddy supply control valve 39a,
It is determined that the hulling work has started, and the control unit 25 causes the inverter 25 to
A frequency increase command (for example, the frequency is increased from 64 hertz to 67 hertz) is issued to the a for a predetermined time, and the inverter 2
The hulling operation is started with the number of rotations of 5a increased.
Therefore, it is possible to perform the hulling work while keeping the removal rate relatively high by reducing the decrease in the rotation speed due to the increased load on the hulling rolls 3 and 3 at the start of the work.

Next, the frequency control when the work of the inverter 25a is completed will be described with reference to FIG. During the hulling / sorting operation, the presence / absence of grains in the paddy hopper 2 is determined by the grain sensor 3
When the grain sensor 37 detects that there is no grain, the work is determined to be completed. When it is determined that the work is completed, the main motor 44 is driven by the inverter 25a.
Is adjusted to the decreasing side (for example, from 64 hertz to 60 hertz), the rotation speed of the main motor 44 is adjusted to the lowering side, and after a predetermined time, the run / stop switch 43 is turned off and the machine is stopped.

Therefore, the rotation drive unit of the whole hulling machine is rotated at a low speed to reduce the skin rub of the brown rice in the hulling rolls 3 and 3 during the remaining rice treatment, and to reduce the reduced grains. The fallen rice is wind-sorted by a weak sorting wind in the scraped-rice drafting unit 4 to reduce the scattering of paddy and brown rice, and the number of rotations of the rotary sorting cylinder 11 is reduced to sort the mixed rice and to the brown rice. It is possible to perform paddy sorting while improving the sorting accuracy while preventing the paddy from being mixed.

In addition to the above control, the inverter 25
If the configuration is such that the cylindrical rotation adjusting motor 47 is adjusted to the increasing side by a and only the rotation selection cylinder 11 is rotated in the normal working state, the rotation selection cylinder 11 performs the selection as usual,
The sorting efficiency is improved. Further, a work temporary stop switch (not shown) may be provided, and the frequency reduction control may be performed in association with the turning on of this switch. Further, when the shutter sensor 39 detects closure of the paddy supply control valve 39a, It may be determined that the work is completed.

Next, the frequency control during work interruption or idling will be described with reference to FIG. Figure 8-
As shown in the control flow in (1), when the power switch (not shown) is turned on, the load current sensor 32 detects the load current value of the main motor 44 and compares it with the reference no-load current value. However, when the load current value is high, it is determined to be a normal hulling work state, frequency control is performed by the inverter 25a,
When the main motor 44 controls to maintain a predetermined rotation speed, and when the detected load current value falls within the range of the reference no-load current value, it is determined that the hulling operation is suspended, and a frequency reduction command is issued. For example, the normal frequency can be controlled to be reduced from 64 hertz to 58 hertz to lower the rotation speed of the main motor 44 and reduce the power consumption. Note that the torque reduction command may be controlled to reduce the ON time of the unit frequency.

As shown in the control flow in FIG. 8- (2),
When a power switch (not shown) is turned on, the grain sensor 37 detects the presence of grains in the paddy hopper 2, and the shutter sensor 39 detects whether or not the paddy supply control valve 39a is open. Then, the shutter sensor 39 detects the presence of paddy, and the shutter sensor 39 then detects the paddy supply control valve 3
When the opening of 9a is detected, it is determined that the hulling work has started, and the increasing frequency at the time of starting the work is controlled, and the frequency is adjusted to the increase side than during the normal work, and the rotation speed of the main motor 44 is increased. Control and start the initial work. The torque increase command may be controlled to increase the ON time of the unit frequency.

When the grain sensor 37 detects no paddy or the shutter sensor 39 detects that the paddy supply control valve 39a is closed, it is determined that the work is not started or the work is interrupted, and the frequency reduction control is performed. The rotational speed of the motor 44 is adjusted to be reduced. Note that the torque reduction command may be controlled to reduce the ON time of the unit frequency. Therefore, it is possible to perform the work while keeping the removal rate relatively high by reducing the decrease in the rotation speed due to the increase in the load of the hulling rolls 3 and 3 at the start of the work, and the power consumption during the work interruption. It can reduce consumption. In determining the suspension of the hulling operation, the roll expansion sensor 38 may be used to detect a gap expansion of the hulling rolls 3, 3 and the scattering sensor 42 to detect no grain scattering.

Next, overload control at the start of hulling work will be described with reference to FIG. Turn the breaker (not shown) O
When the run / stop switch 43 is turned on to drive the rotating parts of the huller sorting machine, the frequency control by the inverter 25a is stopped and the rolls of the hulling rolls 3 and 3 are rotated. The gap initial setting control and the opening adjustment control of the paddy supply adjusting valve 39a are performed, and the paddy hulling operation is started.

Next, the frequency control by the inverter 25a is started, and then the load current sensor 32 detects the load current value of the main motor 44 and compares it with the reference overload current value to detect the detected load current value. When the frequency exceeds the reference overload current value and the frequency is equal to or lower than the predetermined frequency (for example, 62 hertz), the work is continued in the overload state, but when the frequency is equal to or higher than the predetermined frequency, the torque correction control by the inverter 25a, That is, a torque reduction command for shortening the ON time at the unit frequency is issued, then the detected load current value is compared with the reference overload current value, and when the detected load current value still exceeds the unit frequency, When a torque reduction command for shortening the ON time is issued and the detected load current value falls within the range of the reference overload current value, the torque correction control ends.

Then, the control shifts to the frequency control of the inverter so that the detected frequency returns to the reference frequency.
Hulling work is performed while maintaining the main motor 44 at a predetermined rotation speed. When the detected load current value does not exceed the reference overload current value, the torque correction control is not performed and the frequency control is immediately executed. When performing the torque correction control and the frequency control, the automatic / manual switch 3 is used.
0 is switched to the automatic OFF side, and hulling rolls 3, 3
The roll clearance control based on the above-mentioned load current value reference is stopped.

When the frequency control is completed, the frequency control of the main motor 44 based on the current value detected by the inverter 25a is started, and the roll gap of the hulling roll based on the load current value is started. Control is started. During the hulling operation, it is controlled whether or not the detected load current value exceeds the breaker capacity that is the reference overload current value, and when it exceeds, the hulling rolls 3 and 3 are controlled. The gap is adjusted,
The work is continued while maintaining the predetermined load current value and controlling the roll clearance on the basis of the load current value.

Depending on the type of paddy or the old and new paddy, the flow-in condition into the paddy rolls 3, 3 is different, and in the case of paddy with a large flow-in amount, the paddy rolls 3, 3 are used at the start of the paddy work. In some cases, the load of No. 1 increases all at once and becomes overloaded, and hulling cannot be performed. However, with the above-described configuration, it is possible to overcome the overload state and smoothly start the hulling work while reducing interruption of the hulling work.

Next, the inverter control at the start of hulling work will be described with reference to FIG. When the run / stop switch 43 is turned on and the hulling work is started, the ON time of the unit frequency of the inverter 25a is detected and the detection is turned on.
When the detected ON time has not reached the range of the first reference value by comparing the time with the first reference value, an increase or decrease command of the ON time is issued and the detected ON time is returned to the first reference value. Control is performed. When the detection ON time falls within the range of the first reference value, an opening adjustment command for the paddy supply adjusting valve 39a is issued, the paddy supply adjusting valve 39a is opened and adjusted, and the paddying operation is started.

Next, torque correction control is performed to shorten the ON time of the unit frequency of the inverter 25a by a predetermined amount, and the detected ON time is compared with a second reference value (first reference value> second reference value). Then, when the detected ON time has not yet reached the second reference value, an ON time reduction command is additionally issued, and when the detected ON time reaches the second reference value, the frequency control of the inverter is performed. Is.

With the above structure, the hulling work is started by correcting the torque of the main motor 44 to a high level for a predetermined time at the start of the work, and then the hulling work is performed while the torque is corrected to a normal state. Therefore, even when hulling a large amount of inflowing rice, it is possible to smoothly perform the hulling work while avoiding the overload while reducing the interruption of the hulling work due to the overload.

Next, the operation of FIGS. 1 and 2 will be described. The paddy placed in the paddy hopper 2 is supplied to the pair of paddy rolls 3 and 3 to be padded. The rice that has been hulled is
The light rice husks are supplied to the lower slide-down rice wind selecting section 4 and are air-selected, and the light rice husks are discharged out of the machine through the suction dust discharger 5 and the dust discharge cylinder 6, and the mixed rice of heavy brown rice and paddy is Lower sliding rice gutter 7
To be sorted. Next, the mixed rice dropped and selected on the scraped rice receiving trough 7 is fried by the mixed rice lifting machine 8 and supplied to the mixed rice hopper 9, and further, the inside of the supply trough 14 is conveyed from the conveyance start end to the conveyance end. It is conveyed toward the section and is supplied to the sorting start end side of the rotary sorting cylinder 11.

The mixed rice supplied to the starting side of the rotary sorting cylinder 11 is picked up while being inserted into the pot hole on the inner peripheral surface and scooped up, and the small brown rice is scooped up high and the brown rice gutter 16
The large-sized paddy and a part of the brown rice are scooped up low and dropped into the supply gutter 14. In this way, the brown rice selected by the brown rice gutter 16 is the brown rice gutter 16
The inside is conveyed by the brown rice spiral 15 to the sorting end side of the rotary sorting cylinder 11, and then it is dropped through the brown rice falling cylinder 17 and the brown rice grain plate 18 into the brown rice receiving trough 19 while being wind-selected, and further the brown rice is fried. It is taken out of the machine via the grain machine 20.

The mixed rice dropped in the supply gutter 14 is conveyed by the supply spiral 13 and supplied to the sorting start end side of the rotary sorting cylinder 11 for re-sorting, and the inside of the rotary sorting cylinder 11 is sorted to the sorting end side. The flowed and sorted grains fall into the paddy receiving gutter 21, and are further reduced to the paddy rolls 3 and 3 via the paddy grain elevator 22 and the paddy reducing hopper 23, and the paddy is rolled again. It is removed.

[0037]

According to the present invention, when the detected load current value of the main motor 44 exceeds the reference overload current value as described above, first, the torque is corrected by the inverter 25a, and then the torque is corrected. Since the frequency of the inverter 25a is controlled, even in the case of hulling of paddy that easily flows in, it is possible to overcome the overload state and to smoothly start the hulling work with less work interruption.

[Brief description of the drawings]

FIG. 1 is a cut side view and a cut back view of a hulling sorter.

FIG. 2 is a cutaway side view of a main part.

FIG. 3 is a block diagram.

FIG. 4 is a block diagram.

[Figure 5] Front view of the panel

FIG. 6 is a flowchart.

FIG. 7 is a flowchart.

FIG. 8 is a flowchart.

FIG. 9 is a flowchart.

FIG. 10 is a flowchart.

[Explanation of symbols]

 1 Hulling part 2 Hulling hopper 3 Hulling roll 4 Sliding rice wind selection part 5 Suction dust collector 6 Dust collector 7 Sliding rice gutter 8 Mixed rice grain hopper 9 Mixed rice hopper 10 Sorting case 11 Rotating sorting cylinder 12 Drive roller 13 Supply spiral 14 Supply gutter 15 Brown rice spiral 16 Brown rice gutter 17 Brown rice falling tube 18 Brown rice grain board 19 Brown rice receiving gutter 20 Brown rice grain grazing machine 21 Paddy receiving gutter 22 Paddy grain grinder 23 Reduction hopper 24 Roll clearance adjusting means 25 Control section 25a Inverter 26 Depth rate upper switch 27 Depth rate lower switch 28 Cylindrical rotation high switch 29 Cylindrical rotation low switch 30 Automatic / manual switch 31 Display change switch 32 Load current Sensor 33 Power supply voltage sensor 34 Power supply frequency sensor (R-T) 35 Power supply frequency sensor (S-T) 36 Signal conversion circuit 37 Glen sensor 38 Roll expansion sensor 39 Series Yatta sensor 39a Paddy supply adjusting valve 40 Rotation sensor 41 Valve opening sensor 42 Scattering sensor 43 Run / stop switch 44 Main motor 45 Roll gap adjusting motor 46 Shatter opening adjusting motor 47 Cylindrical rotation adjusting motor 48 Communication equipment 49 Display tube 50 Cylindrical rotation speed display device 51 Current display LED 52 LED display device 53 Buzzer 54 Control panel 57 EEPROM

Claims (1)

[Claims] 1. A pair of hulling rolls 3, 3 and an invertor.
Main motor 44 that can be controlled by the motor 25a and drives the hulling rolls 3, 3, a load current sensor 32 that detects a load current value of the main motor 44, and the hulling roll. Roll gap control means for controlling the opening and closing of the gaps 3 and 3 on the basis of the load current value or the removal rate reference, and the torque for shortening the ON time of the unit frequency in connection with the overload detection of the load current sensor 32. A control device for a hulling / sorting machine, comprising: a reduction control means; and a frequency control means for changing a frequency that operates after the operation of the torque reduction control means ends.