JPS6216138B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rate control device for a rice huller. In a huller, it is necessary to maintain an appropriate shedding rate of rice that has been scraped off, and today, a shedding rate control device has been proposed and commercialized for this purpose. There are still problems in this respect. In this type of control device, the roll gap that gives the desired ejection rate is manually adjusted, and the standard for automatic control is set based on this. Since this is done with a roll gap adjustment volume that is indirectly related to unrolling by electrical means, it is difficult to determine how much the roll gap changes due to this adjustment, and therefore, the amount of adjustment is too large. In addition, the gap between the rolls is too small, making it difficult to obtain the desired roll gap, and it takes time to achieve stable operation through automatic control. Therefore, the present invention aims to improve the above-mentioned drawbacks of the conventional technology, and its purpose is to provide an evasion ratio control device that can easily set the roll gap to provide a desired evasion ratio and can start automatic control smoothly and quickly. Our goal is to provide the following. A feature of the invention to achieve this object is that the roll gap adjustment is provided with a motor and a manual handle for the roll gap adjustment mechanically associated with derolling, allowing the roll gap to be adjusted electrically or manually. Mechanism 1 and the roll gap adjustment mechanism according to a comparison between a reference load that is adjusted and set based on the load of the roll drive motor during derolling at a roll gap that provides a desired derolling rate and a detected load of the deroll drive motor that varies. The roll gap control means is further provided with a switch SW1 for switching the control of the roll gap between automatic and manual, a display means 3 for displaying the adjustment setting of the reference load, and an LED1 in the roll gap control means. This invention provides a shedding ratio control device for a rice huller, in which a standard load can be adjusted and set according to a roll gap that provides a desired shedding ratio, which is set by manual operation of the roll gap adjustment mechanism 1 before the automatic gap control starts. . Embodiments of the present invention will be described above with reference to the drawings. Figure 1 is a schematic diagram of a rice huller related to the present invention.
Reference numeral 10 in the figure indicates a hulling section, and 20 indicates a swing sorting section. The hulling section 10 includes a supply hopper 5 and a venting chamber 7 that communicates with the hopper, and a shutter 5a that allows the hopper outlet to be opened and closed is interposed in the communication section between the two. A control valve 9a and a delivery roll 9b provided at the entrance of the removal chamber 7 below the shutter 5a control the amount of paddy supplied to a pair of removal rolls 11a and 11b provided in the removal chamber by the valve opening degree. This is mechanically related to the vertical movement of the floating hopper of the swing sorting section 20 , as will be described later. The roll-off consists of a main roll 11a and a sub-roll 11b, which are rotated by a roll drive motor (not shown) with a predetermined circumferential speed difference. A roll gap d is provided between the rolls, and the roll gap d is adjusted by moving the sub roll 11b in the left-right direction in the drawing by the roll gap adjustment mechanism 1. The mechanical relationship between the roll gap adjustment mechanism 1 and the auxiliary roll 11b is the mechanism 1.
This is achieved by coupling the guide body 17 to the shaft 19 of the auxiliary roll 11b, which is engaged by the screw shaft 13 and rotates by the rotation of the screw shaft 13 with the rotation support shaft 15 as a fulcrum. The roll gap adjustment mechanism 1 includes a motor and a manual handle for adjusting the roll gap, and can adjust the roll gap electrically or manually. The swinging sorting section 20 includes a swinging hopper 21 and a swinging sorting plate 23. The swinging hopper 21 is suspended by an elastic body 25 and moves up and down according to the internal storage amount of rice to be sorted. The vertical movement of the hopper 25 is caused by the hulling part 10.
Regarding the control valve 9a, the valve opening is small when the stored amount is large, and the valve opening is large when the stored amount is small. The oscillating sorting plate 23 is oscillated by a oscillating mechanism (not shown) diagonally from left to right and up and down in the drawing, and gravity-sorts the rice to be sorted from the floating hopper 21. In addition, the dashed-dotted line in FIG. 1 shows the flow of grains. FIG. 2 shows a specific example of the roll gap adjustment mechanism, which includes a motor M and a manual handle 27 for adjusting the roll gap. The motor M has a motor gear 31 on its drive shaft via a speed reducer 29, and the gear 31 meshes with a handle gear 33 of the manual handle 27. The manual handle 27 is connected to the screw shaft 13 so as to rotate it, and the rotation of the screw shaft 13 causes the induction body 17 to rotate about the rotation support shaft 15 to move the sub roll toward and away from the main roll. Adjustment of the roll gap is made. Rotation of the screw shaft 13 and adjustment of the roll gap can be performed using either the motor M or a manual handle. In the case of a manual handle, the desired roll gap width can be set based on the relationship between the scale 35 and an index (not shown). It's summery.
On the other hand, automatic adjustment of the roll gap by motor M is performed by roll gap control means described below. 3a and 3b show an embodiment of the roll gap control means, FIG. 3a shows a block diagram thereof, and FIG. 3b shows a specific example of the circuit shown in FIG. 3a. The principle of controlling the roll gap shown in Figures 3a and b is that if the load on the motor that drives derolling is constant, it is possible to maintain the shedding rate of paddy derolled by the rolls at an approximately constant level. On the basis of the,
The object of the present invention is to detect the load of the roll drive motor, and control the roll gap so that the load is always approximately equal to a reference load that provides a desired ejection ratio, thereby keeping the ejection ratio constant. Therefore, as shown in FIG. 3a, the means 41 for detecting the load of the roll drive motor, the means 43 for setting a reference load giving a desired escape rate, and the output levels of both the load detecting means 41 and the reference load setting means 43 A comparison circuit 45 provides a comparison output according to the magnitude of the detected load with respect to a reference load, and a delay circuit 47 provides a delay to the comparison circuit output in order to prevent roll gap control from chattering according to the comparison result.
a, 47b, roll gap adjustment motor M (second
It has an output circuit 49 that drives the forward or reverse relay (R1 or Rz) shown in the figure), and receives the output of the comparator circuit 45 to output the match between the detected load and the reference load and lights up the LED1. It has an output circuit 3 and an automatic/manual changeover switch SW1.
Furthermore, the conditional circuit 51 in the figure is an AND-
1 and AND-2 to the output circuit 49, and the storage capacity of the hopper 21 is almost full (at this time, the opening degree of the control valve 9a is extremely small).
Automatic control of the roll gap is canceled when the roll is empty or when the roll is nearly empty to prevent damage to roll removal and overload on the roll drive motor. The output of the condition circuit 51 is also given to the condition output circuit 53,
During automatic control, LED1 is lit while the amount stored in the floating hopper is within the appropriate range. In addition, LED2 is a pilot indicating that automatic control is in progress, and SW2 is a pilot indicating that automatic control is in progress.
The paddy sensor provided in the supply hopper 5 at 0 is held in the closed state in the presence of supplied paddy. Also,
SW3 is a shutter switch that responds to the opening and closing of the shutter 5a in the hulling section 10 and maintains the closed state between the shutters, and SW4 is a switch for electrically manually operating the roll gap instead of operating the manual handle. The load detection means 41, as shown in FIG. 3b,
The load of the roll removal drive motor is detected by a current transformer CT and outputted at a DC level via an amplifier circuit 411 and a smoothing circuit 412. The reference load setting means 43 includes an amplification factor variable volume 431
Amplifier 431 whose output can be adjusted and set by VR
A reference load that provides a desired escape rate is set in relation to the output of the load detection means 41. That is, to set the reference load, first set the roll gap that provides the desired ejection ratio by operating the manual handle of the roll gap adjustment mechanism 1 (Fig. 2) with the automatic/manual changeover switch SW1 in the manual state, and then adjust the roll gap accordingly. The load of the roll drive motor that is removed at the time is detected by the load detection means 41, and the volume 431VR is adjusted to match the detected load. At this time, the roll gap that provides the desired escape ratio is determined by a manual handle that is mechanically directly related to the auxiliary roll, so it is obvious at a glance that the roll gap changes in response to the operation of the manual handle. The operation can be performed in light of the operator's prior experience as to whether the evasion rate can be obtained, and it is easy to set the roll gap to give the desired evasion rate. In addition to the reference voltage 433, inputs to the amplifier 431 for providing such a reference load include the desired deviation from the load fluctuation of the roll drive motor due to changes in the valve opening of the control valve 9a (Fig. 1). The outputs of a clamp circuit 435 and a valve opening sense 437 are provided to obtain the ratio. In other words, the relationship between the valve opening degree, that is, the amount of paddy supplied to the derolling machine, and the load on the roll drive motor, as shown in Fig. 4, is parabolic when obtaining rice with a derolling rate of 85%, regardless of the valve opening degree. There is a proportional relationship, and the load increases as the valve opening increases. Therefore, if the reference load is set based only on the reference voltage 433, it will not be possible to maintain the escape rate constant against changes in the valve opening, so the clamp circuit 435 and the valve opening sense 437
Accordingly, the line of 85% escape rate is linearly approximated as shown by the dashed line in the figure, so that the amplified output is placed on the line of desired escape rate regardless of the valve opening degree. Note that the valve opening degree is sensed by associating a potentiometer with the control valve. The amplifier output is also given to the comparator circuit 45 via a correction circuit 439, which moves the aforementioned 85% line in parallel by adding a predetermined voltage, which is a characteristic of the roll drive motor. This is to correct for differences or variations in the values. The comparator circuit 45 has a pair of comparators 451a and 451b as shown in FIG. is configured to provide a divided voltage of a reference load and perform window comparison. That is, the load detection means 4
1's output is X, and the output of the reference load setting means 43 is Y.
Assuming that the partial pressure value is Y', as shown in FIG. 5, the comparator 451a provides a comparison output when X>Y, and the comparator 451b provides a comparison output when X<Y'. If Y'<X<Y, the comparison output is zero, indicating that the detected load almost matches the reference load. The output of the comparison circuit 45 is sent to the delay circuits 47a, 47.
b and the AND gate to the output circuit 49, and when the automatic/manual changeover switch is in the automatic state and the switches SW2 and SW3 are in the on state, the output of the conditional circuit 51 is "1", that is, the idle hopper 21
(Fig. 1), the roll gap adjustment motor relay (R1 or R
2) is driven, and automatic control operates so that the detected load matches the reference load. The output of the comparator circuit 45 is also input to the eclipse rate OK output circuit 3. The escape rate OK output circuit 3 outputs a reference load setting volume 43 of the reference load setting means 43.
When the output of the reference load setting means 43 almost matches the load of the roll drive motor that gives the desired escape rate by adjusting 1VR, the LED 1 is turned on to indicate that the reference load has been set. Transistor Tr that turns on and off with the output of 45
1 and Tr2, AND301 which gives an output when both transistors are off, and the LED driven by the AND output
It has a transistor Tr3 that lights up the transistor Tr3. The transistors Tr1 and Tr2 are turned off when the comparison output is zero, and the voltage applied to their respective collectors is input to the AND301, which turns on the transistor Tr3 and lights up the LED1. On the other hand, if the comparison output is not zero, Tr1
Alternatively, since Tr2 is turned on, the collector potential of the transistor in the on state becomes zero potential, and Tr3 is turned off. Note that the conditional circuit 51 includes a pair of comparators 51
1a and 511b, and determine the upper and lower limits of the amount stored in the floating hopper according to the valve opening degree of the control valve that is closely related to the amount stored in the floating hopper, and within a predetermined range defined by the upper and lower limits. It is configured to output "1" when . When performing automatic control with the derolling device configured as described above, the roll drive motor is driven to rotate the deroller and the automatic/manual changeover switch SW1 is set to the manual state, and then paddy is loaded into the supply hopper 5 as desired. Enter the setting of the roll gap that gives the escape rate. To set the roll gap, first set the roll gap to an initial gap (usually 7 to 8 m/m) in relation to the scale 35 by operating the manual handle 27 of the roll gap adjustment mechanism 1, then check the evasion rate at the gap. If necessary, readjust the roll gap to obtain the desired removal rate. If the desired ejection rate is obtained through the above manual operation, the standard load setting means is set to match the load of the roll drive motor during ejection at the relevant gap, that is, until the LED 1 lights up by driving the ejection rate OK output circuit 3. 43, the reference load adjustment volume 413VR is adjusted to set the reference load. Next, when the automatic/manual changeover switch SW1 is set to the automatic state, automatic control of the escape rate is started in accordance with the set reference load. Note that manual operation of the roll gap can also be performed using the manual switch SW4, but in terms of ease of adjusting the roll gap, a manual handle is easier. As explained above, according to the present invention, the standard load setting, which is the basis of automatic de-rolling control, is performed by manual operation of the roll gap adjustment mechanism mechanically related to de-rolling, without activating automatic control. ,
It is now easier to set the roll gap that gives the desired ejection ratio, and when setting the load of the roll drive motor that is ejecting at the roll gap as the reference load, the matching is displayed, making it easier to adjust the reference load. Therefore, it is possible to provide an evasion rate control device that can easily and smoothly start automatic control.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of a huller, Figure 2 is an example of a roll gap adjustment mechanism, Figures 3a and 3b are examples of roll gap control means, and Figure 4 is the load and control of the roll drive motor. FIG. 5 is an explanatory diagram of the operation of the comparison circuit in FIGS. 3a and 3b. 1...Roll gap adjustment mechanism, SW1...Auto/manual changeover switch, 3...Elimination rate OK output circuit, LED1
...Light emitting diode.

Claims (1)

[Claims] 1. A roll gap adjustment mechanism that is equipped with a motor and a manual handle for adjusting the roll gap mechanically related to derolling, and is capable of electrically or manually adjusting the roll gap, and a roll gap adjustment mechanism that provides the desired derolling rate. further comprising roll gap control means for automatically controlling the roll gap adjustment mechanism according to a comparison between a reference load adjusted and set based on the load of the roll drive motor and a detected load of the roll removal drive motor; The roll gap control means includes a switch for switching the control between automatic and manual, and display means for displaying the adjustment setting of the reference load, and the roll gap adjustment mechanism is set by manual operation of the roll gap adjustment mechanism before starting the automatic control of the roll gap. 1. A removal rate control device for a rice huller, characterized in that a reference load can be adjusted and set according to a roll gap that provides a desired removal rate.