JPH0577462B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a hulling grain selection plant.

The present invention is intended for use in plant equipment where paddy is turned into brown rice in order from a graining device or a stocker to a huller and a sorter, where the rice husks sorted by the huller get clogged in the middle, and it is bad for the sorting of brown rice. This invention relates to a rice husk transport fan rotation speed control device for controlling the transport of rice husks so as not to affect the rice husks.

(b) Prior art In a conventional rice hulling and sorting plant, the rice husks after being dehulled into paddy and brown rice by the hulling machine are discharged through a rice husk pipe by a transport fan, and the rice husks are The fan was driven by a motor or engine, and the number of rotations of the transport fan was maintained at a constant speed.

(c) Problems to be solved by the invention In such a configuration, if the rotation speed of the rice husk transport fan is constant or the rotation speed decreases as the load increases, the rice husk transport pipe may become longer. The more the wind blows, the more the rice husks get stuck in the pipes, making it impossible to remove them. Moreover, if the rice husk transport pipe is long, the suction power of the rice husk transport fan will be reduced, and the dust removal effect will also be reduced. On the other hand, if the rice husks transport pipe is short, the suction force is too strong and the husks are sucked in through the dust removal section until they are sized and discharged, reducing the efficiency of obtaining brown rice. Also, because the distance is too short, the fan drive motor consumes a lot of current, causing the motor breaker to trip.

Furthermore, since the amount of paddy that enters the huller is automatically controlled, when the oscillating sorter becomes full, the shutter of the huller's paddy tank is closed and no more paddy is supplied to the huller. Therefore, since no rice husks are produced, no rice husks are discharged from the rice husks transport pipe, and the load on the motor is reduced at once. Therefore, at that time, the wind power of the rice husk transportation fan increases and the rice husks are blown far and in the wrong direction. In other words, each time the rice tank shutter is turned on or off, the wind power increases or decreases, and the distance the rice husks are transported varies.

(d) Means for solving the problem In order to solve the above problems, the present invention controls the rotation speed of the rice husk transport fan according to the amount of rice husks and the distance of the transport pipe. In other words, the rotation speed of the fan drive motor increases or decreases due to changes in the amount of rice husk entering the rice husk transport pipe, that is, changes in load, so the increase or decrease in the rotation speed of the fan drive motor is detected by an ammeter and its output is controlled. As an input to the circuit, a control circuit controls the rotational speed of the fan drive motor to a rotational speed corresponding to the load.
Furthermore, wind speed sensors are installed before and after the rice husk transport fan to detect the wind speed for dust removal and the wind speed for transporting rice husks, and the control circuit controls the fan drive motor to obtain the appropriate wind power for each. The rotation speed is controlled.

(e) Embodiments and operations The purpose and structure of the present invention are as described above, and the structure of the present invention will be explained based on the structure of the embodiment shown in the attached drawings.

FIG. 1 is a drawing of a hull-husking plant showing the main parts of the present invention. FIG. 2 is a side view and partially sectional view showing the motor equipped with a split pulley. FIG. 3 and FIG. 4 are drawings showing an embodiment of a wind speed sensor attached to a pipe.

The paddy grain sorting plant is as shown in Fig. 1, and to explain in detail the process order of sorting into brown rice, 1 is a paddy tank, and upper and lower level sensors 27 and 28 are installed in the paddy tank. Paddy is supplied from a dryer or a stocker to the paddy tank 1 by an elevator. When the paddy accumulates to the upper limit position, the upper level sensor 27 turns on and stops the motor of the elevator, and the paddy is husked. When the level decreases to the lower limit, the lower level sensor 28 is turned ON and the elevator is operated. That is, the paddy tank 1 is constructed so that a constant amount of paddy is always stored therein. A huller 2 is connected to the lower part of the rice tank 1 via a shutter 31 that opens and closes automatically. of
It is designed to open and close by turning on and off. The hulling machine 2 removes the chaff from the rice with a dehulling roll 2a, and when the chaff, brown rice, unhulled paddy, etc. fall, they are screened by a fan 3, and foreign matter and rice husk are removed by a rotary leaf feeder 5. and is sent to the rice husk transport pipe 6. Then, the mixed rice consisting of brown rice and partially unhulled paddy is sent to the upper part of the mixed rice tank 9 by an elevator 4 communicating with the lower part of the huller 2. rotary feeder 5
The wind generated by the fan 3 is blown into the rice husk transport pipe 6 to prevent fluctuations in wind pressure and backflow from the rice husk transport pipe 6 from interfering with sorting.

Like the paddy tank 1, the mixed rice tank 9 is equipped with level sensors on the top and bottom, and when the mixed rice accumulates to the upper limit level, the upper level sensor 29 is activated.
It turns on and closes the shutter 31 at the bottom of the paddy tank 1, and when the mixed rice decreases and falls to the position of the lower level sensor 30, the lower level sensor 30 turns on and the shutter 31 opens. Therefore, mixed rice is always stored in the mixed rice tank 9 between the upper level sensor 29 and the lower level sensor 30. The mixed rice in the mixed rice tank 9 falls into an oscillating sorter 10 connected to the lower part. In the oscillating sorter 10, a large number of grain sorting plates are piled up and tilted and oscillated by a oscillating motor 12, and the paddy and brown rice are separated due to their surface roughness and difference in specific gravity, and the paddy is returned to the paddy tank 1 again. The brown rice is sent to a brown rice sorter 13 by a conveyor 12 connected to an oscillating sorter 10, where small dust etc. are further removed, and the brown rice is sent to a weighing and bagging device by a conveyor 15.

The device for removing dust and transporting rice husks is carried out using the wind generated by a rice husk transport fan 16, which sucks in dust, etc. in the rice tank 1 through a dust removal pipe 7, and similarly transfers dust etc. into the mixed rice tank 9 through a dust removal pipe 8. The dust inside is sucked and sent to the rice husk transport pipe 6 by the rice husk transport fan 16. And brown rice sorter 1
3 is also sent to the rice husk transport fan 16 through the dust removal pipe 14. The rice husk transport pipe 6 is extended to a predetermined position where rice husks are stored, and its length can be changed depending on the business establishment.

The rice husk transport fan 16 is driven by a fan drive motor 17, both of which are transmitted by a V-belt 18, so that the rotation speed can be adjusted. That is, as shown in FIG. 2, a split pulley 33 is attached to the drive shaft 32 of the fan drive motor 17 and is biased by a spring 34. and,
The base 35 of the fan drive motor 17 is connected to the rail portion 4 of the frame 43 of the split pulley adjustment motor 19.
3a, and a base 35 is screwed onto the drive shaft of a split pulley adjustment motor 19, which is a servo motor. Then,
When the split pulley adjustment motor 19 is rotated forward, the base 35 is drawn toward the split pulley adjustment motor 19, and since the V belt 18 that drives the rice husk transport fan 16 has a constant length, the fan drive motor 17 The split pulley 33 attached to the drive shaft opens, and the drive radius of the V-belt 18 becomes smaller. That is, the rotation speed of the rice husk transport fan 16 is reduced. Conversely, if the split pulley adjustment motor 19 is reversed, the base 35 will move away from the split pulley adjustment motor 19, the rotational circumference of the V-belt 18 will increase, and the rotation speed of the rice husk transport fan 16 will increase. It is. In addition to changing the rotation speed using the split pulley, it is also possible to electrically change the rotation speed of the motor by phase control or chopper control.

The present invention is to control the rotation speed of this rice husk transport fan 16, and the method thereof will be described in detail.

The rotation speed of the rice husk transporting fan 16 is adjusted by the setting dial 23 and rotated in the normal direction by the control circuit 24 in order to obtain sufficient wind power to transport the rice husks, taking into consideration the transportation distance of the rice husk transporting pipe 6 and the amount of rice husks. The rotation speed is determined by operating the relay 25 or the reversing relay 26 to adjust the split pulley. 20 is a fuse, 21 is a power switch, and 38 is an overload relay.

However, since the shutter 31 is closed by the level sensors 29 and 30 of the mixed rice tank 9, the amount of rice husks in the rice husks transport pipe 6 increases and decreases as the rice husks are released and stopped each time. Therefore, the rice husk transportation load will increase or decrease, and the current value of the fan drive motor 17 will also fluctuate. That is, while the rice husks are being discharged from the huller 2, the operation is normal, but the shutter 3
1 closes and no longer releases rice husks, the transportation load decreases, the rotational speed of the rice husk transportation fan 16 increases, and the current value of the fan drive motor 17 also increases. If the amount of variation is large at that time, an overcurrent will flow and blow the fuse 20. Therefore, the current value is detected by the ammeter 22 and compared with the set current value by the control circuit 24.
The forward rotation relay is activated to reduce the number of revolutions, allowing for trouble-free operation. On the other hand, if the load increases, the transport capacity will decrease and cause a blockage, so in order to increase the wind force, a reversing relay is activated to increase the rotation speed.

In addition, if there are too many rice husks or foreign substances in the huller 2, or if there is too much brown rice in the brown rice sorter 13, or if there is too much dust, clogging will occur in the rice husk transport pipe 6. The amount of suction into the dust removal pipe 14 decreases, and brown rice sorting cannot be performed properly. To deal with this situation, wind speed sensors 3 are installed before and after the rice husk transport fan 16 in the rice husk transport pipe 6 and the dust removal pipe 14, respectively.
For example, if the wind speed of the dust removal pipe 14 decreases, the dust removal effect of the brown rice wind sorter 13 decreases, so the rotation speed of the rice husk transport fan 16 is increased, and the wind speed in each pipe changes. Then, the control circuit 24 operates the forward rotation relay 25 or the reverse rotation relay 26, and the fan drive motor 17 is activated.
The rotation speed of the rice husks is controlled to prevent a decrease in the efficiency of hulling the rice and wind sorting the brown rice.

3 and 4 show examples of the wind speed sensors 36 and 37, and in FIG. 3, the wind pressure applied to the wind pressure plate 40 is converted into voltage by a potentiometer 39 and output to the control circuit. In FIG. 4, a voltage is generated in a generator 42 by the rotation of a fan 41 and outputted to a control circuit. Note that 42 may output the rotational speed as a pulse.

(F) Effects of the Invention By having the present invention configured as described above, the rice husk transport pipe is long and the rice husk becomes clogged in the middle.
It does not reduce the dust removal effect of brown rice wind sorting, paddy tanks, and mixed rice tanks, and on the contrary, because the rice husk transport pipe is short, the rotation speed of the fan drive motor increases and overcurrent flows, causing the fuse to blow. This prevents the dust from getting too hot or the suction from the dust removal pipe being too strong and sucking in even the sized particles.
Therefore, it is possible to change the length of the rice husk pipe to change the length of the rice husk discharge position even during the work.

Furthermore, even if the position of rice husk release is constant,
Even if the air volume fluctuates due to the opening/closing of the shutter of the rice husking machine or the amount of rice husks increasing or decreasing due to fluctuations in the hulling efficiency, the dust removal effect does not decrease or clogging occurs as described above, and the distance that the rice husks can be thrown is increased. There were no more fluctuations.

[Brief explanation of the drawing]

FIG. 1 is a drawing of a rice husk sorting plant showing the main parts of the present invention. FIG. 2 is a side view and partially sectional view showing the motor equipped with a split pulley. FIG. 3 and FIG. 4 are drawings showing an embodiment of a wind speed sensor attached to a pipe. 1... Rice tank, 2... Husker, 6... Rice husk pipe, 10... Oscillating sorter, 16... Rice husk transport fan, 17... Fan drive motor, 22...
Ammeter, 24...control circuit, 36, 37...wind speed sensor.

Claims (1)

[Scope of Claims] 1. A huller that dehulls paddy using a huller 2 connected to the lower part of a rice tank 1, and sorts the mixed rice supplied from the huller 2 into brown rice using a swinging sorter 10. In the grain sorting plant, the rice husks wind-sorted by the huller 2 are discharged into the rice husk transport pipe 6, and the rice husks are configured to be transported by the wind power of the rice husk transport fan 16, depending on the increase or decrease in the amount of rice hus transported. A rice husk transport fan rotation speed control device for a rice husking machine, characterized in that the rotation speed of a rice husk transport fan 16 is controlled by the following steps. 2. In the grain sorting plant, the current supplied to the fan drive motor 17 is detected by an ammeter 22,
Claim 1, characterized in that the rotation speed of the rice husk transport motor 17 is controlled by the control circuit 24.
A rice husk transport fan rotation speed control device for a rice huller as described in 2. 3. In the grain sorting plant, wind speed sensors 36 and 37 are provided before and after the rice husk transport fan 16, respectively, and the rotation speed of the rice husk transport motor 17 is controlled by the control circuit 24 based on the outputs of the wind speed sensors 36 and 37. A rice husk transport fan rotation speed control device for a rice huller as claimed in claim 1.