JP2000343042A - Rotary shaking separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the response time for making the layer thicknesses of separating plates adequate by providing the separating plates with level sensors, discriminating the layer thicknesses of blended rice by the level sensors and controlling inclination angle adjusting means in such a manner that the blended rice attains the prescribed layer thickness. SOLUTION: Such link mechanisms 35 as to be parallel with the separating plates 21 are disposed above the plate surfaces of the separating plates 21 and the level sensors 25 are mounted at these link mechanisms 35. The level sensors 25 are disposed near weirs 47 nearer the central 0 side than the peripheral edge sides of the separating plates 21. The distances from the level sensors 25 to the upper limit position of the blended rice and the distances from the level sensors 25 to the lower limit position of the blended rice are preset. Whether the layer thicknesses of the separating plates 21 are thin or thick is discriminated by the level sensors 25 and the grades of the separating plates 21 are automatically controlled to arbitrary angles by the inclination angle adjusting means 24 from the results of the discrimination.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oscillating sorter for sorting a mixture of chaff and brown rice after hulling, and more particularly, to a sifting plate having a circular shape in plan view, and rotating and oscillating the sifting plate. The present invention relates to a rotary swing sorter for sorting paddy and brown rice.

[0002]

2. Description of the Related Art The applicant of the present invention has filed a patent application for a rotary oscillating sorter in which a layer thickness on a sorting plate is kept constant and sorting accuracy is kept constant even when physical properties such as moisture and a coefficient of friction of a sorting object are changed. Flat 10-1
No. 14529. According to claim 1 of the present invention, a plurality of fan-shaped sorting plates formed on a rough surface are laid in a mortar shape having a low central portion and a high circular arc portion, a paddy extraction hole in the central portion, and brown rice in the peripheral portion. A separation frame having a take-out opening formed therein and a tilt angle adjusting means for adjusting a tilt angle of the selection plate provided therein, a rotating shaft vertically provided at a center position of the sorting frame, and a rotational drive of the rotating shaft. Drive source,
And an eccentric rotation mechanism including an eccentric shaft connected to the sorting frame by being eccentrically appropriately eccentric from the axis of the rotating shaft, and disposed above the sorting frame, and throwing mixed rice of paddy and brown rice into the sorting plate. A rotary swinging sorter provided with a raw material input means, wherein a plurality of level sensors for detecting the layer thickness of the mixed rice are provided on the sorting plate, and the mixed rice is detected based on detection values of the plurality of level sensors. A controller is provided for determining the spread state and controlling at least one of the inclination angle of the sorting plate, the number of rotations of the drive source, and the input amount of the raw material input unit so as to have an appropriate layer thickness. .

[0003] Thus, even if physical properties such as moisture and a coefficient of friction of the sorting object change, the layer thickness on the sorting plate is detected by the level sensor, and the spread state of the mixed rice on the sorting plate is determined. The control device selectively controls at least one parameter among the inclination angle of the sorting plate, the number of rotations of the driving source, and the input amount of the input means, and changes physical properties such as moisture and a coefficient of friction of the selected items. Even so, the layer thickness of the sorting plate is made appropriate and the sorting ability does not change.

[0004] In the invention of claim 2, the level sensor comprises a pair of sensors provided at an upper limit position and a lower limit position of a layer thickness of the mixed rice, and the pair of sensors is connected to a paddy extracting hole of the sorting plate. This is provided on the side and the brown rice take-out side, respectively, thereby making it possible to easily determine whether the raw material is biased toward the paddy discharge side or the raw material is biased toward the brown rice discharge side.

[0005]

According to the above-mentioned conventional rotary swing sorter, the inclination of the sorter plate, the supply amount from the mixed rice tank and the rotation speed of the rotating shaft are determined by the on / off pattern of the level sensor. , At least one parameter is selectively adjusted to maintain a constant layer thickness, and to keep the sorting ability constant.

[0006] However, when the supply amount from the mixed rice tank is changed, there is a disadvantage that the gradient of the optimal sorting plate always changes, and the optimal sorting state cannot be maintained. That is, the control for keeping the sorting ability constant using a plurality of parameters (for example, the supply amount from the mixed rice tank, the slope of the sorting plate, and the number of rotations of the rotating shaft) is unstable, so that the layer thickness is appropriately adjusted. It takes a long time to hold.

Further, the level sensor comprises a pair of sensors provided at an upper limit position and a lower limit position of a layer thickness of the mixed rice, and the pair of sensors are arranged on a paddy takeout hole side and a brown rice takeout side of the sorting plate. When each of the selection plates is provided in multiple stages, the configuration is complicated, and the cost is increased because a large number of level sensors are provided.

[0008] In view of the above problems, the present invention reduces the response time for adjusting the layer thickness of the selection plate, and
It is a technical object of the present invention to provide a rotary swing sorter capable of simplifying a configuration in which a sorting plate is configured in multiple stages.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a rotating shaft that is rotatably erected, a driving unit that rotationally drives the rotating shaft, and a rotating shaft provided on the rotating shaft. An eccentric portion eccentric from the shaft center by a certain distance, a circular sorting frame axially mounted on the eccentric portion, holding means for preventing free rotation of the sorting frame, and laying on the sorting frame. Portion is provided with a high selection plate, and an inclination angle adjusting means provided inside the selection frame and adjusting an inclination angle of the selection plate,
A rotary oscillating sorter that eccentrically rotates the sorting frame by rotation of the rotating shaft to sort mixed rice of paddy / brown rice, wherein the sorting plate includes a level sensor that detects a layer thickness of the mixed rice. And a control circuit for judging the layer thickness of the mixed rice by the level sensor and controlling the inclination angle adjusting means so that the mixed rice has a predetermined layer thickness is provided.

Thus, even if the physical properties of the mixed rice, such as moisture and coefficient of friction, change, the layer thickness of the mixed rice is determined by a level sensor provided at one location, and the inclination angle is adjusted so as to have a predetermined layer thickness. Since the adjusting means is controlled, the parameter is only the inclination angle of the selection plate, and the response is fast and the layer thickness can be properly maintained in a short time.

[0011] The paddle discharge port formed at the center of the sorting plate, a weir erected on the outer periphery of the paddy discharge port, and an opening for discharging the paddy retained by the weir, Since the level sensor is disposed near the weir where the outflow trajectory of the paddy does not occur, avoiding the opening, the influence of the outflow trajectory of the paddy that occurs near the opening at the time of discharging the paddy (see the arrow in FIG. 10). A region where the layer thickness is stable can be detected. Further, since the level sensor is provided near the weir on the center side of the sorting plate peripheral side, the layer thickness of the mixed rice spreads gradually from the center direction of the sorting plate to the peripheral direction (FIG. 12). (Refer to (B)), and the danger (fear) that the chaff is discharged from the brown rice outlet by centrifugal force is reduced.

The level sensor comprises a single light receiving section capable of continuously monitoring the mixed rice from a thin layer to a thick layer, and detects a detection value from the light receiving section and a preset value of the mixed rice. By comparing the upper limit position and the lower limit position, when the position becomes equal to or more than the upper limit position or equal to or less than the lower limit position, a control circuit for controlling the inclination angle adjusting means is provided, so that one level sensor is provided for one circular sorting plate. , And the configuration is simple and the cost is low.

Further, the level sensor includes at least two light receiving units, and one of the two light receiving units monitors the distance to the upper limit position of the mixed rice, and the other light receiving unit monitors the distance to the upper limit position of the mixed rice. The light receiving unit monitors the distance to the lower limit position of the mixed rice, and controls the inclination angle adjusting means so that the layer thickness of the mixed rice is always between the upper limit position and the lower limit position. Since it is provided, the upper limit position and the lower limit position of the selection plate can be accurately detected, and the inclination angle of the selection plate can be accurately adjusted.

Further, a link mechanism is provided above the sorting plate so as to be parallel to the sorting plate, and the level sensor is attached to the link mechanism, so that the inclination angle of the sorting plate is changed. Even in this case, the upper limit position and the lower limit position of the mixed rice can be accurately detected without changing the upper limit position and the lower limit position of the mixed rice.

When a plurality of selection frames are provided, it is preferable to provide one level sensor for each selection frame, so that the configuration is simple and the cost is low.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a part of a hulling sorter obtained by adding a hulling device to the rotary swinging sorter of the present invention, and FIG. 2 is a perspective view of FIG. FIG. 3 is a perspective view showing a partially broken part of the case. The outline of the hulling sorter will be described with reference to FIGS. 1 and 2. The hulling sorter 1 supplies a hulling device 3 provided with a pair of hulling rolls 2 and 2, and rice crushed by the hulling device 3 to upper and lower two-stage circular sorting plates 4A and 4B. The rotary rocking sorter 5 that separates the rice into the paddy layer and the brown rice layer, the discharge thrower 6 that discharges the brown rice in the brown rice layer out of the machine, and the hulling device 3 to re-drain the rice in the paddy layer The screw conveyor 7 to be returned, and the supply thrower 8 for supplying the paddy rice fed into the raw material hopper 10 to the hulling device 3.
It is composed of Reference numeral 9 denotes a mixed rice tank for storing the crushed rice removed by the hulling device 3, and reference numeral 11 denotes a casing of an air selection fan for selecting the crushed rice removed by the hulling device 3. .

Next, the rotary oscillating sorter 5 will be described in detail. The rotary oscillating sorter 5 comprises mortar-shaped circular sorting plates 4A and 4B having a lower center and a higher peripheral edge in two vertical stages. It is arranged, and the paddy discharge ports 12A and 12B are formed in the center part of each circular sorting board 4A and 4B, and the brown rice discharge ports 13A and 13B formed in the peripheral part of said circular sorting board are formed. Sign 1
4A and 14B are paddy discharge gutters for guiding paddy from the paddy discharge ports 12A and 12B to the screw conveyor 7, and reference numerals 15A and 14B.
Reference numeral 15B denotes a brown rice discharge gutter for guiding brown rice from the brown rice discharge ports 13A and 13B to the discharge thrower 6, and reference numerals 16A and 16B denote a mixture of rice and brown rice from the hulling device 3 in a circular sorter 4A.
It is a mixed rice supply gutter for supplying to 4B.

FIG. 10 is a plan view of the circular sorting plate 4. Referring to FIG. 10, the paddy discharge port 12, the brown rice discharge port 13, the mixed rice supply gutter 16, and the outer periphery of the paddy discharge port 12 are erected. The positional relationship of the weir 47 will be described. The weir 47 is provided with an opening 49 for discharging the paddy that has been dammed by the weir 47. The positional relationship between the opening 49 and the brown rice outlet 13 is as follows: the radius r connecting the center O of the circular sorting plate 4 to the opening 49; the center O of the circular sorting plate 4 and the brown rice outlet 13; It is preferable to arrange each of them so that the radius s connecting them is orthogonal to each other. Further, it is preferable that the mixed rice supply gutter 16 is disposed on a radius shifted by about 45 ° in a conveying direction of the mixed rice from a radius s connecting the center O and the brown rice discharge port 13. Reference numeral 48 denotes a paddy sensor, and the sorting plate 2
1 to detect the presence or absence of the paddy on the pad, and to control the opening and closing of the paddy discharging means (not shown) provided in the opening 49.

Further, the rotary swing sorter 5 will be described with reference to FIGS. 1 and 2. The circular sorters 4A, 4
The outer periphery of B and the machine casing 17 are connected by a plurality of springs 18, and the springs 18 have a function as holding means for preventing free rotation. Next, the swing means provided near the center of the circular sorting plates 4A and 4B will be described. The vicinity of the centers of the circular sorting plates 4A and 4B is supported by a rotating shaft 19 which is rotatably provided upright. A motor (not shown) is provided at the bottom of the machine frame 17 to rotatably drive the rotating shaft 19, and the motor and the rotating shaft 19 are rotatably connected.

In order to simultaneously swing and rotate the two-stage circular sorting plates 4A and 4B, it is necessary to deform the rotary shaft 19. That is, the circular sorting plates 4A and 4B are
Eccentric portions 19A and 19B bent from the axis of the rotary shaft 19 are provided near the center where the eccentric portions 19A and
In 19B, the circular sorting plates 4A and 4B are alternately arranged (for example,
It is good to attach the shaft (by 180 °).

Next, a circular sorting plate 4 which is an essential part of the present invention
A, 4B inclination angle adjusting means, and said circular sorting plate 4A,
The level sensor 25 for detecting the layer thickness of the mixed rice on 4B will be described.

FIG. 3 is a schematic diagram showing the internal configuration of the circular sorting plates 4A and 4B. The circular sorting plates 4A and 4B include sorting frames 20A and 20B that support a plurality of sorting plates 21..., A rotatable rotating shaft 19 that supports the center of the sorting frames 20A and 20B, and a rotatable rotating shaft 19. Small-diameter eccentric cams 22A, 22B and large-diameter eccentric cam 23 eccentric from the shaft center O
A, 23B, inclination angle adjusting means 24 for adjusting the inclination of the sorting plates 21 at an arbitrary angle, and a level sensor 25 for detecting the layer thickness of the mixture of rice and brown rice.

The tilt angle adjusting means 24 will be described in detail with reference to FIG. The main part of the inclination angle adjusting means 24 is constituted by a plurality of selection plates 21 having a fan shape in plan view and an annular member 26 provided at the center of the selection plates 21.
A pin 28 is attached to one locking piece 27 provided near the top of the fan of the sorting plate 21... And the pin 28 is fitted into a long hole 29 formed around the annular member 26 to sort. The plate 21 and the annular member 26 are engaged. Further, a rod-shaped member 31 is passed through the two locking pieces 30, 30 provided below the peripheral edge of the selection plate 21, and the rod-shaped member 31 is separated from the selection frame 20.
Are fixed to the inner protruding pieces 32 (see FIG. 3), the sorting plates 21 are engaged with the sorting frame 20. Thus, when the annular member 26 slides, the pin 28 is guided to the oblong elongated hole 29. Then, as shown in FIG. 5, the sorting plate 21 moves up and down, and the gradient can be adjusted to an arbitrary angle between, for example, 8 ° and 12 °. As for the sliding of the annular member 26, when the angle changing motor 33 attached to the annular member 26 is driven, the sliding becomes possible automatically. A limit switch 34 is attached to the annular member 26 in the sliding direction, and sets an upper limit position and a lower limit position of the sorting plate inclination angle.

Further, the mounting state of the level sensor 25 will be described with reference to FIGS. A link mechanism 35 is provided above the plate surface of the sorting plate 21 shown in FIG. 3 so as to be parallel to the sorting plate 21, and the level sensor 25 is attached to the link mechanism 35. In the sorting plate 21 in plan view shown in FIG. 10, the level sensor 25 is disposed near the weir 47 where the outflow trajectory of the paddy does not occur, avoiding the opening 49. Thereby, it is possible to detect an area where the layer thickness is stable without being affected by the outflow trajectory of the paddy generated near the opening 49 at the time of discharging the paddy (see the arrow in FIG. 10). The level sensor 25 is provided near the weir 47 closer to the center O than the peripheral side of the sorting plate 21. That is, when the level sensor 25 is provided on the peripheral side of the sorting plate 21 (see FIG. 1).
1 (A), the thickness of the mixed rice is gradually increased from the center of the sorting plate 21 toward the peripheral edge thereof (see FIG. 11 (B)). There is less danger (fear) that paddy is discharged from the rice.

As the level sensor 25, a distance setting type photoelectric switch (for example, model ES3-CL manufactured by OMRON Corporation) is used.
Etc.) should be used. That is, the distance from the level sensor 25 to the upper limit position of the mixed rice and the distance from the level sensor 25 to the lower limit position of the mixed rice are set in advance.
May be configured to operate. In addition to the distance setting type photoelectric switch, an analog output photoelectric sensor that can continuously monitor mixed rice from a thin layer to a thick layer can be used.

FIG. 6 is an operation diagram at the time of detecting a layer thickness using the above-mentioned distance setting type photoelectric switch. This distance setting type photoelectric switch emits a parallel light beam toward a detection area.
6 and a light receiving lens 37 for condensing reflected light from the object to be detected
And a two-divided light receiving element 38 disposed behind the light receiving lens 37 and having a photodiode N on the near side of light reception and a photodiode F on the far side of light reception.
It was housed inside. The level sensor 25 is disposed above the plate surface of the sorting plate 21, monitors a set distance from the upper limit position L0 of the mixed rice to the photodiode N, and monitors a set distance from the lower limit position L1 of the mixed rice to the photodiode F. Will be.

FIG. 7 is a diagram showing a relay control circuit for driving the angle changing motor in response to signals output from the photodiodes N and F. As shown in FIG.

In the relay control circuit 39 shown in FIG. 7, the output side of the photodiode F is connected to the power supply circuit 42 of the angle changing motor 33 via the relay 40, and the output side of the photodiode N is connected via the relay 41. It is connected to the power supply circuit 42 of the angle changing motor 33. The relay 40 has a switch SW1 built therein, and the relay 41 has switches SW2 and SW3 built therein. The power supply circuit 42 includes a circuit 45 for rotating the angle changing motor 33 in the normal direction (steep gradient) and a circuit 46 for rotating the angle changing motor 33 in the reverse direction (slow gradient). Further, the power supply circuit 42 has an automatic / manual changeover switch. 43, a manual angle change switch 44, and limit switches 34A and 34B indicating upper and lower limits.

FIG. 8 is an operation diagram at the time of detecting a layer thickness by an analog output photoelectric sensor. This analog output photoelectric sensor emits a parallel light beam toward a detection area.
And a light receiving lens 37 for condensing reflected light from the object to be detected
And a light receiving element 38 disposed behind the light receiving lens 37 and capable of continuously monitoring from a thin layer to a thick layer is housed in the case 25.

As shown in FIG. 9, since the characteristic of the light receiving element 38 becomes substantially linear between the output signal (current value or voltage value) and the monitoring distance, a control circuit (not shown) Within the range, the detected value from the light receiving element 38 is compared with the preset upper limit position L0 and lower limit position L1 of the mixed rice, and when the position is equal to or higher than the upper limit position L0 or lower than the lower limit position L1, the angle changing motor 33 is controlled. do it.

Next, the operation of the above configuration will be described.
When dry rice is put into predetermined moisture from the raw material hopper 10 of the rice hulling sorter 1 shown in FIGS. 1 and 2 and the supply thrower 8 is operated, the rice is supplied to the pair of removal rolls 2.
The removal rolls 2, 2 are configured to rotate at different peripheral speeds inward from each other, and are removed by the pressure of the rolls when the paddy passes through the removal rolls 2, 2 and the shearing force due to the difference in peripheral speed. Processing is performed.

[0033] The crushed rice after the dehulling treatment is air-selected in an air selection chamber (not shown) below the dehulling chamber. Is discharged outside from the casing 11 of the wind selection fan.

A fixed amount of mixed rice of paddy and brown rice is fed from a mixed rice tank 9 and supplied to each of the circular sorting plates 4A and 4B via a mixed rice supply gutter 16. In the present invention, it is not necessary to change the supply amount depending on the properties of the mixed rice, and it is preferable to always feed a fixed amount.

At this time, when the rotating shaft 19 provided at the center of the machine frame 17 is rotated, the circular sorting plates 4A, 4B fixed to the eccentric portions 19A, 19B are rotated. In the mixed rice supplied to the circular sorting plates 4A and 4B, the acceleration increases toward the peripheral side, and since the circular sorting plates 4A and 4B are inclined, brown rice having a small particle size and a large specific gravity is applied to the peripheral side. The paddy having a large particle size and a small specific gravity is transported to the center of the circular sorting plates 4A and 4B while being transported to the center. Then, the brown rice falls from a brown rice discharge port 13 formed in the periphery of the circular sorting plates 4A and 4B to a brown rice discharge gutter 15 and is taken out of the machine as a refined product from the discharge thrower 6. The paddy is supplied from the paddy discharge gutter 14 to the screw conveyor 7, sent to the hulling device 3, and re-drained.

The sorting operation for sorting mixed rice into paddy and brown rice is as follows:
If the physical properties, such as moisture and coefficient of friction, do not change, the sorting ability will not change. For example, when performing the second sorting operation, the sorted materials with different physical properties (moisture and friction coefficient) from the first one When using a circular sorting plate 4A, 4
The layer thickness on B changes, and the sorting ability changes. Therefore, the gradient of each sorting plate 21 in the circular sorting plates 4A, 4B is arbitrarily adjusted while keeping the supply amount of the mixed rice and the rotation speed of the circular sorting plates 4A, 4B constant. That is, the level sensor 25 determines whether the layer thickness of the selection plate 21 is small or large, and automatically controls the gradient of the selection plate 21.
As a result, only the gradient of the separation plate 21 needs to be adjusted, so that the layer thickness can be properly maintained in a shorter time than in the conventional case.

As shown in FIG. 6, the level sensor 25
Is the set distance L0 that is the upper limit position (the distance from the sorting plate 21 is 15 mm) and the set distance L0 that is the lower limit position of the mixed rice.
1 (the distance from the sorting plate 21 is 10 mm), and the appropriate layer thickness of the mixed rice is between L0 and L1.

[Table 1]

As shown in Table 1, the driving of the angle changing motor 33 is controlled by the on / off pattern of the photodiode N and the photodiode F. That is, when the layer thickness becomes L1 from the sorting plate immediately after the start of sorting, both the photodiode F and the photodiode N are off, and SW1 and SW2 in the relay control circuit 39 are turned on,
SW3 turns off. Then, the circuit 45 for rotating the angle changing motor 33 in the normal direction (steep slope) is turned on, and the inclination angle of the sorting plate 21 is changed to a steep direction. Further, when the layer thickness is from L1 to L
0, the photodiode F is on, the photodiode N is off, and SW1 and SW3 are off and SW
2 turns on. At this time, the circuit 42 does not conduct and the inclination angle of the selection plate 21 is appropriate, so that the angle changing motor 33
Is stopped. Further, when the layer thickness becomes L0 or more, both the photodiode F and the photodiode N are on, SW1 and SW2 are turned off, and SW3 is turned on.
Then, the circuit 46 for rotating the angle changing motor 33 in the reverse direction (slow gradient) is turned on, and the inclination angle of the sorting plate 21 is changed to the gentle direction.

The relay control circuit 39 shown in FIG.
Actually, the angle changing motor 33 is always driven so that the layer thickness of the mixed rice is always between the upper limit position and the lower limit position.

On the other hand, in the control circuit using the analog output photoelectric sensor of FIG. 8, a threshold is set between L0 and L1 shown in FIG. It is determined that the angle of the plate 21 is appropriate, and the angle changing motor 33 is
Is not driven.

For example, the control using an analog output photoelectric sensor will be described with reference to FIG. 11. In step 102, a signal V from the light receiving element 38 is fetched, and in step 103, this signal V is compared with the signal at the distance L1. And
If the signal at the distance L1 is large, the routine proceeds to step 106, in which the angle changing motor is driven in the sharp direction. If the signal at the distance L1 is small, the routine proceeds to step 104. In step 104, the signal V is compared with the distance L0, and if it is larger than L0, the process proceeds to step 106, in which the angle changing motor is driven in a gentle direction. When the angle adjustment of the sorting plate 21 is completed, a stop signal is output in step 107, and the process is terminated.

If the change of the inclination angle by the angle changing motor 33 as described above takes about 2 seconds to change by 1 °, the response is quick and the layer thickness quickly approaches the predetermined value.

[0043]

As described above, according to the present invention, a rotating shaft that is rotatably erected, a drive unit that rotationally drives the rotating shaft, and a drive shaft that is provided on the rotating shaft and extends from the axis of the rotating shaft An eccentric portion eccentric at a fixed distance, a circular sorting frame pivotally mounted on the eccentric portion, holding means for preventing free rotation of the sorting frame, and sorting with a lower bottom center and a higher peripheral portion laid on the sorting frame. Plate, provided in the sorting frame, provided with an inclination angle adjusting means for adjusting the inclination angle of the sorting plate, the eccentric rotation of the sorting frame by the rotation of the rotating shaft, to mix the mixed rice of paddy and brown rice A rotary swing sorter for sorting, wherein the sorting plate includes:
A level sensor for detecting the layer thickness of the mixed rice is provided, and a control circuit for determining the layer thickness of the mixed rice by the level sensor and controlling the inclination angle adjusting means so that the mixed rice has a predetermined layer thickness is provided. Therefore, even when the physical properties of the mixed rice, such as the moisture and the coefficient of friction, are changed, the layer thickness of the mixed rice is determined by the level sensor provided in one place, and the inclination angle adjusting means is controlled so as to have a predetermined layer thickness. Therefore, the parameter is only the inclination angle of the selection plate, and the response is fast and the layer thickness can be properly maintained in a short time.

[0044] Further, there is provided a paddy discharge port formed at the center of the sorting plate, a weir standing upright on the outer periphery of the paddy discharge port, and an opening for discharging paddy retained by the weir. Since the level sensor is disposed near the weir where the outflow trajectory of the paddy does not occur, avoiding the opening, the layer thickness is stable without being affected by the outflow trajectory of the paddy generated near the opening during the discharge of the paddy. The detected area can be detected. Further, since the level sensor is provided near the weir on the center side of the sorting plate peripheral side, the layer thickness of the mixed rice spreads so as to gradually decrease from the center direction of the sorting plate to the peripheral direction, and the centrifugal force is increased. This reduces the risk of paddy being discharged from the brown rice outlet.

Further, the level sensor comprises a single light receiving portion capable of continuously monitoring the mixed rice from a thin layer to a thick layer, and detects a detection value from the light receiving portion and a preset upper limit of the mixed rice. By comparing the position with the lower limit position, when the position becomes equal to or more than the upper limit position or equal to or less than the lower limit position, a control circuit for controlling the inclination angle adjusting means is provided.
It is only necessary to provide one level sensor per sheet, and the configuration is simple and the cost is low.

The level sensor is composed of at least two light receiving units, and one of the two light receiving units monitors the distance to the upper limit position of the mixed rice, and the other light receiving unit monitors the distance to the upper limit position of the mixed rice. The unit monitors the distance to the lower limit position of the mixed rice, and provides a control circuit for controlling the inclination angle adjusting means so that the layer thickness of the mixed rice is always between the upper limit position and the lower limit position. Therefore, the upper limit position and the lower limit position of the selection plate can be accurately detected, and the inclination angle of the selection plate can be accurately adjusted.

Further, a link mechanism is provided above the sorting plate so as to be parallel to the sorting plate, and the level sensor is attached to the link mechanism. Therefore, when the inclination angle of the sorting plate is changed. Even in this case, the upper limit position and the lower limit position of the mixed rice can be accurately detected without changing the upper limit position and the lower limit position of the mixed rice.

When a plurality of selection frames are provided, one level sensor may be provided for each selection frame, so that the configuration is simple and the cost is low.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of a hulling sorter obtained by adding a hulling device to the rotary swing sorter of the present invention.

FIG. 2 is a partially cutaway perspective view when viewed from different directions in FIG. 1;

FIG. 3 is a schematic diagram showing an internal configuration of a circular sorting plate.

FIG. 4 is a schematic view showing a structure of a tilt angle adjusting means of a sorting plate.

FIG. 5 is an explanatory view showing the operation of the inclination angle adjusting means.

FIG. 6 is an operation diagram at the time of detecting a layer thickness by a distance setting type photoelectric switch.

FIG. 7 is a relay control circuit diagram of a distance setting type switch and an angle changing motor.

FIG. 8 is an operation diagram when a layer thickness is detected by an analog output photoelectric sensor.

FIG. 9 is a characteristic diagram of the analog output photoelectric sensor.

FIG. 10 is a plan view of a circular sorting plate.

FIG. 11 is a flowchart of a control circuit using an analog output photoelectric sensor.

FIG. 12 is a schematic diagram showing a sorting state according to a mounting position of a level sensor.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 hulling sorter 2 hulling roll 3 hulling apparatus 4 circular sorter 5 rotary swinging sorter 6 discharge slower 7 screw conveyor 8 supply slower 9 mixed rice tank 10 raw material hopper 11 casing 12 rice discharge 13 brown rice discharge 14 Paddy discharge gutter 15 Brown rice discharge gutter 16 Mixed rice supply gutter 17 Machine frame 18 Spring 19 Rotating shaft 20 Separation frame 21 Separation plate 22 Small diameter eccentric cam 23 Large diameter eccentric cam 24 Inclination angle adjusting means 25 Level sensor 26 Ring member 27 Locking piece 28 rod-shaped member 29 long hole 30 locking piece 31 rod-shaped member 32 inner protruding piece 33 angle changing motor 34 limit switch 35 link mechanism 36 light emitting part 37 light receiving lens 38 two-divided light receiving element 39 relay control circuit 40 relay 41 relay 42 power supply Circuit 43 Automatic / manual switch 44 Manual angle change switch 45 Forward rotation circuit 46 Reverse rotation circuit 47 Weir 48 Rice paddy sensor 49 Opening

Claims (6)

[Claims] A rotating shaft erected rotatably; a drive unit for rotating the rotating shaft; an eccentric portion provided on the rotating shaft and eccentric by a certain distance from an axis of the rotating shaft; A circular sorting frame pivotally mounted on the portion, holding means for preventing free rotation of the sorting frame, a sorting plate having a lower bottom center and a higher peripheral portion laid on the sorting frame, and provided inside the sorting frame. And a tilting angle adjusting means for adjusting a tilting angle of the sorting plate, a rotary swinging sorter for eccentrically rotating the sorting frame by rotation of the rotating shaft to sort mixed rice of paddy and brown rice. The sorting plate is provided with a level sensor for detecting the layer thickness of the mixed rice, the level sensor determines the layer thickness of the mixed rice, and the tilt angle adjusting means so that the mixed rice has a predetermined layer thickness. A rotary swing sorter comprising a control circuit for controlling. 2. A paddy discharge port formed at the center of the sorting plate, a weir standing upright on the outer periphery of the paddy discharge port, and an opening for discharging paddy retained by the weir to the paddy discharge port. The rotary swing sorter according to claim 1, wherein the level sensor is disposed near the weir where the outflow trajectory of the paddy does not occur, avoiding the opening. 3. The level sensor includes one light receiving section capable of continuously monitoring the mixed rice from a thin layer to a thick layer, and detects a detection value from the light receiving section and a preset value of the mixed rice. 3. The rotary swing sorter according to claim 1, further comprising a control circuit for controlling the tilt angle adjusting means when the upper limit position and the lower limit position are compared with each other, and when the position becomes equal to or more than the upper limit position or equal to or less than the lower limit position. 4. The level sensor comprises at least two light receiving units, and one of the two light receiving units monitors the distance to the upper limit position of the mixed rice, and the other light receiving unit monitors the distance to the upper limit position of the mixed rice. The light receiving unit monitors the distance to the lower limit position of the mixed rice, and controls the inclination angle adjusting means so that the layer thickness of the mixed rice is always between the upper limit position and the lower limit position. The rotary swing sorter according to claim 1 or 2, which is provided. 5. The apparatus according to claim 1, wherein a link mechanism is provided above the sorting plate so as to be parallel to the sorting plate, and the level sensor is attached to the link mechanism. Rotary swing sorter. 6. The rotary swing sorter according to claim 1, wherein the sorting frame is mounted on the rotating shaft by a plurality of stages.