JPH0321852A - Light quantity controller of hulling rate sensor in hull grinding machine - Google Patents

Abstract

PURPOSE:To optimize light quantity adjustment by stopping the adjusting operations of a grain supply amount adjusting means and a roll gap adjusting means by a control means while the quantity of light is adjusted. CONSTITUTION:The gap of a hulling roll 2 is initialized first and then a shutter 9 is opened by a specific quantity to supply grains in a grain hopper to the roll 2, so that the gains are hulled. A sample after this processing is supplied, grain by grain, and a unhulled or unpolished rice is decided from the output of the hulling rate sensor 1 to detect the hulling rate. During this period, the gain supply amount and roll gap are adjusted when necessary. Then the hulling rate sensor 1 varies the quantity of light emission by a light emitting element in the beginning under the control of a microcomputer 4, the sample is measured at each time, and the maximum frequency is found from a measurement distribution of measured values. When the maximum frequency enters a set range, the quantity of light emission enters the best state, the light quantity adjustment is finished, and hulling rate control is entered. During the light quantity adjustment, the roll 2 and the opening extent of the shutter 9 are held in the initialized state and the hulling rate becomes nearly constant.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an improvement in a rice layer layer machine, and particularly to an improvement in the light intensity adjustment of a IfI removal rate sensor provided for detecting the removal rate. (Prior art) Conventionally, in a paddy WI machine, when a grain sample after dehulling is fed one grain at a time using a dewax roll to a dewaxing rate sensor consisting of a light emitting element and a light receiving element, the dewaxing rate sensor a de-flotation rate detection means for determining whether it is paddy or brown rice from the output signal and determining a defloatation rate from the determination result; and a grain supply amount all'f means for adjusting the amount of grain supplied to the de-floating rolls; It is known to have a roll gap adjustment means for adjusting the gap between the de-entraining rolls. In this type of de-entrainment rate sensor, the accuracy of detecting the de-entrainment rate decreases if the amount of light emitted by the light-emitting element is too high or too low, so the light amount is Adjustments are being made. (Problem to be solved by the invention) However, when changing the dehulling rate by opening the dehulling roll during the light intensity im or increasing the amount of grain supplied to the dehulling roll, it is necessary to change the dehulling rate appropriately. There is a possibility that the light intensity cannot be adjusted, and this point has not been considered at all in the past. In view of these points, it is an object of the present invention to avoid fluctuations in the rod removal rate during light intensity adjustment and stabilize it, thereby optimizing the light intensity adjustment. (Means for Solving the Problem) In order to achieve the above object, the present invention is structured as follows. That is, in the present invention, when a grain sample after dewaxing treatment is fed one by one to a dewaxing rate sensor consisting of a light emitting element and a light receiving element, it is possible to determine whether it is paddy or brown rice from the output signal of the dewaxing rate sensor. Determine if there is a de-entrainment, and calculate the de-entrainment rate from the determination result. In the hulling machine, the rice husking machine has a ratio detection means, a grain supply amount adjusting means for adjusting the amount of grain supplied to the defloating rolls, and a roll gap adjusting means for adjusting the gap between the defloating rolls. The amount of light emitted is changed sequentially,
Each time there is a change, the removal rate sensor measures multiple samples, creates a measurement division from each measurement value, calculates its maximum frequency, and when the maximum frequency falls within the set range, the light emitting element a light amount adjusting means for stopping the light amount adjustment; and a control means for stopping each adjustment f1l1 operation of the grain supply amount adjusting means and the roll gap adjusting means when the light amount adjusting means is in the middle of the light amount yA section. This is what happens. (Function) In the present invention constructed as described above, the light amount 7A regulating means controls the light i.
During the adjustment, the control means stops each adjustment operation of the grain supply amount adjustment means and the roll gap adjustment means. Therefore, the amount of grain supplied to the removal roll and the opening degree of the removal roll are both constant and P removal is achieved! Since fluctuations in the rate can be avoided, a light intensity of m is appropriate. (Embodiment) FIG. 1 is a block diagram of an embodiment of the present invention. In the figure, l is a transmission-type dewaxing rate sensor, which irradiates light from a light emitting element (not shown) toward grain samples that have been dehulled by a defloating roll 2 and supplied one grain at a time. The transmitted light is received by a light-receiving element (not shown), and an electrical signal is output according to the amount of received light. A light emitting diode is used as the light emitting element constituting the IfI removal rate sensor l, and a phototransistor is used as the light receiving element. 4 is a microcomputer, which performs control processing as shown in FIG. 2 and has a memory for storing various data. Reference numeral 5 denotes a D/A conversion circuit, which, upon receiving the light amount adjustment signal from the microcomputer 4, converts it from D/A and supplies it to the light emitting element of the removal rate sensor l. 6 is an A/D conversion circuit, and when it receives the output signal from the withdrawal rate sensor l, it converts the A/D conversion circuit.
It is converted into D and supplied to the microcomputer 4. The defloating roll 2 is driven by a defloating roll drive motor 7, and the gap is adjusted by a roll gap: A section motor 8.
This is done by forward and reverse movement. 9 is a grain hopper (not shown)
There is a shutter (on/off valve) installed at the bottom of the grain hopper, and when the shutter 9 is opened, the grains in the grain hopper fall onto the dehulling rolls 2 and are dehulled. Next, an example of the control processing of the embodiment of the present invention constructed as described above will be explained with reference to the flowchart of FIG. First, initial setting of the gap between the defloating rolls 2 is performed (step SL), and when the roll gap adjustment motor 8 is driven to bring the roll gap to the set value, the roll gap adjustment motor 8 stops driving. Next, the shutter 9 of the grain hopper is opened by a predetermined amount (step S2), and the grain in the grain hopper is supplied to the dewaxing roll 2, so that the grain is defloated by the defloating roll. Next, the light -1!31fff (step S3) as described below is started, but during this light amount adjustment, the opening degree of the keyaki removal roll 2 and the opening degree of the shutter 9 are kept at their initial settings. Therefore, the desorption rate remains almost constant. This light intensity adjustment is performed by gradually increasing the light emission amount of the light emitting element of the rod removal rate sensor 1 based on the light intensity 31-node signal from the computer 4, and each time the light emission amount changes, the rod removal rate sensor 1 Measure multiple samples that have been deentrained in Roll 2. Next, from each measurement value, create a measurement distribution A-C as shown in Figure 3 to find the maximum frequency, and check whether the maximum frequency is within the setting range X that is optimal for detecting the deflotation rate. Determine. Through such processing, when the maximum frequency reaches within the setting range X as shown in the measurement distribution C in FIG. 3, the light amount adjustment is terminated. At this time, the amount of light emitted by the light emitting element of the desorption rate sensor l is in an optimal state. When the light intensity adjustment is completed, a discrimination voltage for distinguishing between paddy and brown rice is calculated from the measured value of the de-entrainment rate sensor 1 (step S4), and the process proceeds to control of the de-entrainment rate (step S5). In de-entrainment rate control, the de-entrainment rate is detected from the measured value of the de-entrainment rate sensor l, and the roll gap m is adjusted so that the detected de-entrainment rate matches the setting value set in advance by the de-buoyancy rate setting device. The motor 8 rotates forward and backward to open and close the gap between the defloating rolls 2. In this way, in the embodiment of the present invention, during the light intensity adjustment, the initial setting of each opening degree of the key removal roll 2 and the shutter 9 is maintained, so that the fixed distribution of the key removal rate sensor is As shown in Figure 4 (A), the light intensity mW1 is appropriate. The defloating rate in Figure 4 (A) is approximately 80%. By the way, if the deflotation roll 2 or the shutter 9 is opened during the light intensity adjustment, the measurement distribution of the defloatation rate sensor l will be the fourth one.
As shown in Figure (B), the light intensity adjustment becomes extremely inappropriate. The defloating rate in Figure 4 (CB) is approximately 50%. (Effects of the Invention) As described above, in the present invention, the de-entrainment rate is prevented from changing during the light amount adjustment, so that the light amount adjustment can be made appropriate.
This improves the detection accuracy of the rod removal rate.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a flowchart showing an example of its control processing, and FIGS. 3 and 4 are diagrams each showing an example of the measurement distribution of the rod removal rate sensor. l... Removal rate sensor, 2... Removal roll, 4...
microcomputer,

Claims (1)

[Claims] When a grain sample that has been removed by a derolling process is fed one grain at a time to a removal rate sensor consisting of a light emitting element and a light receiving element, it is determined whether it is paddy or brown rice based on the output signal of the removal rate sensor. a removal rate detection means for determining the removal rate from the determination result, a grain supply amount adjusting means for adjusting the amount of grain supplied to the removal roll, and a gap adjustment between the removal rolls. In a rice hulling machine having a roll gap adjustment means, the amount of light emitted from the light emitting element is sequentially changed, and each time the amount of light emitted from the light emitting element changes, a plurality of samples are measured by a dehulling rate sensor, and a measurement distribution is created from each of the measured values. a light amount adjusting means that calculates the maximum power and stops adjusting the light amount of the light emitting element when the maximum power falls within a set range; while the light amount adjusting means is adjusting the light amount, the grain supply amount adjusting means; and a control means for stopping each adjustment operation of the roll gap adjustment means;