JPS6111632A - Thrashing detector - Google Patents

Abstract

PURPOSE:To prevent the decrease in the detecting capacity in a detecting part by comparing the detection signal outputted from a detecting means and a preset reference value and emitting an alarm when the detection signal is larger than the reference value. CONSTITUTION:The grains flowing down into a guide passage 14 by a roll 8 are supplied to a screening wind path 9 when a rice-hulling machine is started. The total number of the sampling grains is set in a count coincidence circuit 43 and only the set number of the grains are supplied to a detector 2. A grain rail 19 is thereupon glided to guide the grains by each one piece to a hull/unpolished rice detecting sensor 23 which outputs the detection signal for every passage of one piece of the grains. The detection signal from the sensor 23 is outputted to a peak value holding circuit 25 and comparators 29, 39, 63, respectively. The max. value is detected among the peak values outputted to the circuit 25 and said value is held. The signal is outputted to a setting circuit 26 for a hull discriminating voltage and is applied as a reference value for discriminating the hull to the comparator 29. The alarm is emitted from a display device 35 when the detection signal is larger than the reference value.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention generally relates to a dehulling detection device, and more specifically, to detecting the actual dehulling rate by sampling dehulled grains using a huller or the like. The present invention relates to a culling detection device.

[Prior art and its problems] As is well known, the dehulling operation is performed to remove the hull covering the surface of the paddy to obtain brown rice (finished rice). This type of dehulling work is carried out using a hulling machine consisting of a sharp culm room equipped with a pair of culm-breaking rolls, a paddy supply section, a wind sorting room, etc., and a sorting machine equipped with a swinging or rotary sorting section. This is generally done using a huller and sorter that is combined with a rice huller.

Various attempts have been made in the past in order to use the hulling and sorting machine configured as described above to perform the hulling operation without reducing work efficiency or reducing product value. For example, the optimum shedding rate may be determined using various experimental data, or the method for controlling the shedding rate may be improved. By the way, the above-mentioned method of controlling the removal rate is carried out in the following steps. That is, the culling rate desired by the operator is set as a target value for the culling rate control, and the roll gap formed by the weighing roll and the roll rotation speed are initially set to predetermined values to match the target value. After initial setting to a predetermined value in this way, the actual culling removal rate is determined by detecting changes in the current value during work using, for example, a means for detecting the current value of the main motor that drives the culling roll. The roll gap and roll rotation speed are successively adjusted so that the actual shedding rate matches the target value.

However, with the method of controlling the shedding rate as described above, for example, due to large differences in grain varieties and weather conditions such as humidity,
It is not always possible to control the actual de-culling rate to match the target de-weighing rate. Furthermore, even if there is no significant difference in the above conditions, the roll gap and roll rotation speed can be detected by detecting fluctuations in the main motor current value as described above, and the actual shedding rate can be indirectly determined based on the detection results. Therefore, it was difficult to improve the accuracy of deweighing rate control.

From the above point of view, it is possible to calculate the actual shedding rate by sampling the grains that have been subjected to the shedding process and directly detecting the number of dehulled grains and the number of unhulled grains from the total number of sampled grains. it was thought.

However, in the above-mentioned device, when the grain to be detected passes through a detection unit equipped with a non-contact sensor such as an optical sensor during sampling, small pieces of straw attached to paddy etc. may adhere to the detection unit, or There is a problem in that the detection ability of the sensor gradually decreases due to adhesion of dust or the like that has entered the hulling machine to the detection section. Therefore, the discrimination ability of the paddy/brown rice discriminating means that discriminates paddy/brown rice based on the detection signal output from the detection section is inevitably reduced, which poses a problem in that it interferes with the control of the unweighing rate. was there.

[Objective] Therefore, the present invention aims to improve the above-mentioned problems of the conventional technology.The purpose of the present invention is to provide a shedding detection device that can accurately control the shedding rate by preventing the deterioration of the detection ability in the detection section. Our goal is to provide the following.

[Summary of the present invention] The features of the present invention for achieving the above object include a detection means for grain discrimination provided in a flow path of sampled grains;
means for holding a maximum peak value among the detection signals output from the detection means; a paddy discrimination reference value setting means for setting a paddy discrimination reference value according to the magnitude of the maximum peak value; Based on the comparison calculation between the output detection signal and the paddy discrimination reference value given from the reference value setting means,
paddy/brown rice identification means for identifying brown rice; and means for comparing the detection signal output from the detection means with a preset reference value and issuing an alarm when recognizing that the detection signal is larger than the reference value. and is installed in the de-weighing detection device.

"Example" The present invention will be explained in detail below with reference to the drawings.

FIG. 1 is a partial sectional view of a hull removal sorter in which a dehulling detection device according to an embodiment of the present invention is used, FIG. 2 is an overall perspective view of a dehulling detection device according to an embodiment of the present invention, and FIG. The figure is a circuit diagram of a paddy/brown rice discrimination means according to an embodiment of the present invention, and FIG. 4 is a diagram showing the voltage output by the detection means for grain discrimination.

In FIG. 1, the hulling machine 1 includes a supply hopper 3, a culling chamber 5,
It has a suction dust remover 7 and a sorting air passage 9. The supply hopper 3 is provided at the upper part of the dehulling chamber 5, and has a supply port 4 for supplying descaled grains such as paddy to the dehulling chamber 5. Supply port 4
is provided with a control valve 6 for adjusting the amount of unhusked grains fed to the unhusked chamber 5. The dehulling chamber 5 is provided with a pair of dehulling rolls 8 for dehulling the undehulled grains supplied from the supply hopper 3. The gap between the culling rolls 8 is freely adjusted by a roll gap adjustment motor (not shown), and rotationally driven by a main motor (not shown). At the bottom of the weighing chamber 5, there is suction υ1 dust Il! 17 and a sorting air passage 9 that communicates with an air pressure winch (not shown) is provided. The sorting air passage 9 is provided with a dehulled grain transfer gutter 11 for receiving dehulled grains and a second transfer gutter 13 for receiving the second grain. A screw conveyor 10, 12 is mounted on each of the deweighing granule transfer troughs 13. Guide passage 14 on the culling chamber 5 side of the screening air passage 9
The sampling grain supply hopper 1 shown in FIG.
5 is coming.

As shown in FIG. 2, the culling detection device 2 according to an embodiment of the present invention includes a sampling grain supply hopper 15, a vibration plate, 'I7, a grain rail 19, and a vibration motor 21.
, has a paddy/brown rice detection sensor 23.

A shutter 16 is rotatably attached to the sampling grain supply hopper 15. The shutter 16 is configured to open only when a necessary number of grains are sampled flowing down from the guide passage 14 via the dehulling roll 8, and to open at other times. The small brim 1
5 is attached to the end of a vibrating plate 17 formed at a predetermined inclination angle with respect to the ground plane. grain rail 19
is attached to a vibrating plate 17, and one end thereof faces the opening of the hopper 15. The grain rail 19
A paddy/brown rice detection sensor 23 faces the other end. One grain rail has passage intervals set so as to guide the grains given from the hopper 15 to the detection sensor 23 in approximately -rows.

The rail 19 is provided on the back side of the vibration plate 17.

The hopper 15 is driven by the excited vibration motor 21.
transporting grain supplied from

The paddy/brown rice detection sensor 23 is composed of an LED 22 and a phototransistor 24 that face each other across the grain passage 23a. In the paddy/brown rice detection sensor 23, the phototransistor 24 receives the amount of reflected light when the light emitted from the LED 22 hits the grain passing through the grain passage 23a and is reflected, and outputs a voltage signal according to the received amount of light. By doing this, paddy/brown rice is detected. The signal output from the sensor 23 can be illustrated in FIG. 4, for example. In other words, the output voltage from the sensor 23 shown by curve (2) is when the sensor (23) is not contaminated by debris, clumps, etc., and as the dirt progresses, the voltage gradually increases until finally, as shown by curve (2). The limit setting voltage is reached. Note that changes in the output characteristics of the sensor 23 will be described later.

As mentioned above, FIG. 3 shows a circuit diagram of a paddy/brown rice determining means according to an embodiment of the present invention.

The paddy/brown rice determining means 30 includes a comparator 29, 39, 63, a counter 31, 41, a voltage reference value setting circuit 37, 61, a count matching circuit 43, a transistor (hereinafter referred to as rTr J) 45, 57, 71, and a reset circuit. 47, display drive circuit 33, T-type flip 70 tube 49, delay circuit 51
．． 53, OR circuit 59, AND circuit 65, timer circuit 6
7. Automatic switch (hereinafter referred to as automatic SWJ) 6.9.
It has LED73. The automatic initial publication voltage setting circuit 27 that outputs the initial publication voltage reference value to the comparator 29 constituting the determination means 30 is composed of a peak value hold circuit 25 and a first publication voltage setting circuit 26 . The peak value hold circuit 25 detects and holds the maximum peak value from among the detection signals output from the paddy/brown rice detection sensor 23.

The first issue specific voltage setting circuit 26 is the peak value hold circuit 2.
The maximum peak value output from 5 is divided at a predetermined ratio,
This is output as the initial issue-specific voltage reference value. The first publication specific voltage automatic setting circuit 27 is capable of arbitrarily setting the magnitude of the reference value, and the peak value hold circuit 25
detects and holds the maximum peak value of the detection signal, so
Standard values can be freely set depending on the type of grain.

The comparator 29 takes in and compares the reference value (threshold value) output from the automatic setting circuit 27 and the detection signal output from the paddy/brown rice detection sensor 23, and the detection signal is determined to be the reference value (threshold value). If it is higher than the threshold value), it is judged as paddy.
The counter 31 outputs the “HI!” level signal output from the comparator 29. Every time the level signal, that is, paddy detection No. 16 is counted, the data is held and output to the reset circuit 47, and when the count coincidence circuit 43 finishes counting the number of sampling grains set in the circuit, The counted total value data is output to the display drive circuit 33. The display drive circuit 33 is configured to latch the data given from the counter 31 using the II HII level signal output from the OR circuit 59 and drive the display 35 . The display drive circuit 33 uses, for example, a latch register. The display drive circuit 33 is a count coincidence circuit 4 which will be described later.
3 outputs and displays the counted value on the display 35 when the circuit 43 determines that all the set sampling grain numbers have been detected. The display 35 is configured to display the previous paddy number data until new paddy number data is given from the display drive circuit 33. The reference voltage setting circuit 37 sets the brown rice discrimination voltage reference value (the automatic voltage setting circuit 27) so that the comparator 39 always outputs a "HII level signal" when a detection signal is given from the paddy/brown rice detection sensor. (or a threshold value that is smaller than the reference value to be set).

The comparator 39 compares the detection signal given from the paddy/brown rice detection sensor 23 with the reference value given from the reference voltage setting circuit 37 and outputs an "H11 level signal. Note that the reference voltage setting circuit 37 The reason for this is that in order to calculate the deweighing rate, it is necessary to count the total number of sampled grains.
Every time the "H" level signal outputted from 9, that is, the grain detection signal, is counted, the data is held and outputted to the count matching circuit 43 and the reset circuit 47.The counting matching circuit 43 calculates the number of grains sampled. A configurable up counter is used, and is configured to output an "H" level signal when the total count output from the counter 41 matches the set number of grains.T'r4 "5" becomes conductive when the "H" level signal is outputted from the count matching circuit 43, and grounds the "H" level signals outputted from the comparators 29 and 39, respectively. ``It is configured to prevent the level signal from being input to the reset circuit 47.

For example, the reset circuit 47 starts driving due to the discontinuation of the "H" level signal that was continuously input to the up counter and the comparator 29 and the comparator 39, and resets the reset circuit 47 according to a preset value. The reset circuit 47 outputs a reset signal as soon as the specified time elapses, and consists of a function similar to a nose timer.
After the time period during which the display drive circuit 33 holds the data given from the counter 31 after the Tr 45 becomes conductive due to the "H" level signal output from the counter 31, the counter 31 and the counter 41 are reset to be cleared. The T-type flip-flop 49 inverts the 11 H11 level signal output from the count coincidence circuit 43 and outputs it to the delay circuit 51 and the delay circuit 53, respectively.

The delay circuit 51 and the delay circuit 53 are set to have the same time constant of the driving signal, and the signal given from the T-type flip 70 knob 49 is delayed by a certain time and is sent to the OR circuit 59.
Output to. Tr 57 is made conductive by the H11 level signal output from the count matching circuit 43, and when the counted total value data is being read from the counter 31 to the display drive circuit 33, the "H" level signal is output from the OR circuit. In order to prevent the signal from being output from the delay circuit 59, the ``H'' level signal output from the delay circuit 51 or the delay circuit 53 is grounded.

The comparator 63 takes in and compares the set voltage (reference value) outputted from the voltage reference value setting circuit 61 and the detection signal outputted from the paddy/brown rice detection sensor 23, and when the detection signal is larger than the set voltage, When it is recognized, it outputs a "H" level signal. The voltage reference value setting circuit 61 sets a voltage reference value that is a reference for determining dirt marks on the paddy/brown rice detection sensor 23, and determines the voltage reference value, that is, the detection ability of the paddy/brown rice detection sensor 23. The level of the limit setting voltage that indicates the limit of is shown by the curve ■ in FIG. The automatic 5W 69 is a normally open contact and is configured to close after a time set by a timer circuit 67. The time set in the timer circuit 67 is, for example, the time required to identify paddy/brown rice in the - process. The AND circuit 65 calculates the logical product between the signal applied from the comparator 63 and the predetermined voltage level signal applied from the power supply when the timer circuit 67 and automatic 5W 69 are turned on. AND circuit 65 outputs a "H" level signal only when "H" level signals are simultaneously applied via comparator 63, timer circuit 67, and automatic switch 69. The Tr 71 becomes conductive and drives the LED 73 only when a ``H'' level signal is applied from the AND circuit 65.

The operation of the above configuration will be explained below.

Before starting the hulling operation, the roll gap and roll rotation speed are set depending on the grain type, humidity, and other conditions. Next, the operator operates the start switch of the rice huller 1 to start the culling operation. As the culling roll 8 is rotated, the grains that have flowed down into the guide passage 14 via the culling roll 8 are supplied to the sorting air passage 9. When detecting the actual dehulling rate using the deweighing detection device 2 having the above-described configuration during the dehulling work performed in such a procedure, the total number of sampled grains is set in the count matching circuit 43, The shutter 16 of the sampling grain supply hopper 15 is opened/closed so that only the set number of grains is supplied to the detection device 2. The opening/closing operation of the shutter 16 is performed by the count matching circuit 43.
The operation may be performed via a shutter drive circuit (not shown) or may be performed manually by an operator. In this way sampling grain feeding hopper 1
The grains fed through the grain rail 5 slide on the grain rail 19 by the drive of the vibration motor 21 and are guided one by one to the paddy/brown rice detection sensor 23 in an orderly manner. The paddy/brown rice detection sensor 23 outputs a detection signal each time a grain passes by. The peak value of the detection signal output from the paddy/brown rice detection sensor 23 differs depending on the type of grain.

The detection signal output from the paddy/brown rice detection sensor 23 is output to the peak value hold circuit 25, comparator 29, comparator 39, and comparator 63, respectively. The peak value hold circuit 25 detects the maximum value from among the given peak values, holds this value, and outputs the im number to the initial publication voltage setting circuit 26. After the signal is voltage-divided by the first issue voltage setting circuit 26, it is applied to the comparator 29 as the first issue reference value.

On the other hand, the detection signal directly output from the paddy/brown rice detection sensor 23 to the comparator 29 is compared with the reference value in the comparator 29. As a result of the comparison, if the detection signal is larger than the reference value, the comparator 29 determines that it is paddy and outputs a "H" level signal to the counter 31. 'l-1 given from the comparator 29 until it finishes counting
“Continue counting the level signals and output the total value to the display drive circuit 33.

The two-way comparator 39 takes in the detection signal output from the paddy/brown rice detection sensor 23 and generates a ``H'' level signal based on the comparison with the brown rice discrimination voltage reference value given from the reference voltage setting circuit 37. Output.

The counter 41 counts the signal, holds the count value, and outputs it to the count coincidence circuit 43. The count matching circuit 43 sends an 'l-1' level signal to Tr45 and T when the total value of the count given from the counter 41 matches the set total number of sampling grains.
It outputs to the type flip-flop 49 and Tr57. Tr4
5 is rendered conductive by the signal to prevent the "H" level signals output from the comparators 29 and 39 from being input to the reset circuit 47.The signal applied to the T-type flip-flop 49 is , then the count matching circuit 43
II L until the “H” level signal is output.
It outputs an I+ level signal. This is to prevent the display drive circuit 33 from being latched before one stroke of detection work is completed. The OR circuit 59 is the delay circuit 51
．． 53 outputs an "H" level signal for latching, and latches the combined value of the paddy count read from the counter 31 to the display drive circuit 33. -Display drive circuit 3
3 displays the total value on the display 35.

The reset circuit 47 clears the counter 31 and the counter 41 after the display drive circuit 33 is latched.

The grains thus sampled during the culling operation are returned to the sorting air passage 9 of the huller 1 and proceed to the sorting process.

By the way, before the paddy/brown rice sorting process is completed, the comparator 6
3 outputs an H" level signal to the AND circuit 65 when it recognizes that the output signal level from the sensor 23 has become higher than the limit setting voltage level set by the setting circuit 61. As a result, the AND circuit 65 While the circuit 67 is driving, a ``H'' level signal is output to the Tr 71 and the L E
D73 is driven to display an alarm indicating the limit of the detection ability of the sensor 23.

The content described above is only related to one embodiment according to the present invention, and does not mean that the present invention is limited to the above content. Therefore, for example, instead of the circuit configuration such as the above-mentioned paddy/brown rice determining means, a CPU can be used to determine the paddy/brown rice.
Naturally, a configuration for identifying brown rice is also included in the present invention.

Effect] As explained above, according to the present invention, the detection signal output from the detection means is compared with a preset reference value, and an alarm is issued when it is recognized that the detection signal is larger than the reference value. Therefore, it is possible to provide a frame removal detection device that can accurately control the removal rate by preventing a decrease in the detection ability of the detection unit.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional view of a rice huller sorter using a dehulling detection device according to an embodiment of the present invention, FIG. 2 is an overall perspective view of a dehulling detection device according to an embodiment of the present invention, and FIG. FIG. 4 is a circuit diagram of the paddy/brown rice determining means according to an embodiment of the present invention, and is a diagram showing the voltage output by the detecting means for determining grains. 17... Vibration plate 19... Grain rail 22... LED 23... Paddy/brown rice detection sensor 23a... Grain passage 24... Phototransistor 27... Voltage automatic setting by first issue Circuit 30... paddy/brown rice determination means 61... voltage reference value setting circuit 63... comparator 65... AND circuit 67... timer circuit 69... automatic switch 71... transistor 73...・LED Figure 1-Figure 2

Claims (1)

[Claims] a detection means for grain discrimination provided in a flow path of sampled grains; a means for holding a maximum peak value from among the detection signals output from the detection means; paddy/brown rice is determined based on a comparison calculation between the detection signal output from the detection means and the paddy discrimination reference value given from the reference value setting means; paddy/brown rice identification means for identifying paddy/brown rice; and means for comparing the detection signal output from the detection means with a preset reference value and issuing an alarm when recognizing that the detection signal is larger than the reference value. A de-■ detection device characterized by being provided with.