JPS6336311B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a rice huller in which a grain flow velocity sensor connected to an automatic control unit is placed at a position where grain flow and a grain stagnation flow are to be formed on a top net. Concerning the automatic adjustment device for the machine's mangoku upper net.

In order to improve the sorting performance and efficiency of the Mangoku rice huller, the operator adjusts the slope of the Mangoku net according to visual judgment criteria developed through experience based on the grain flow pattern on the Mangoku net. was. However, the flow pattern of the grains changes over and over again, so the Mangokujo net was constantly monitored and adjusted. However, the reality is that nothing has yet been implemented that automatically adjusts the slope of the Mangokujo net. The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to provide an automatic upper net adjustment device for a rice huller that can maintain the sorting performance with high efficiency by automatically adjusting the slope of the upper net. It is something to do.

By the way, the operator's visual judgment criteria mentioned above refers to the grain flow state on the mangoku upper net, which is commonly referred to as "3 minutes of stagnation in 7 minutes of flow". The downstream area is where the grains flow at a high rate, and the remaining approximately third is the stagnation area where the grains are at a slow rate.

Therefore, a sensor is installed near the upper and lower positions in the flow direction of the boundary between the lower grain flow area and the lower grain stagnation flow area on the upper screen to electrically detect the flow velocity of grains and output it to the control unit. The optimum gradient can always be obtained by adjusting the upper mesh gradient based on the detection result and always maintaining the above-mentioned boundary between the upper and lower sensors.

However, if the value (flow velocity) for recognizing grain flow and stagnation flow is the same for both the upper and lower sensors, there is a large difference between the grain flow rate and the grain stagnation flow rate.
The timing of adjustment of the upper mesh slope will be delayed. Therefore, an automatic adjustment device is provided which can quickly adjust the slope by making the flow velocity at which the upper sensor recognizes the stagnation of grains to be slower than the flow velocity at which the lower sensor recognizes the grains to flow down. The purpose is to

The present invention will be explained below based on the preferred embodiment shown in the drawings. In the figure, 1 is a body frame, 2 is a mangeki funnel, and 3 is a mangeki net consisting of wooden frames 31, 31' and a net 32. The area on the net from the top of the Mangoku upper net 3 to approximately the 7th minute in the longitudinal direction of the upper net 3 is defined as a grain flow area 29, and the remaining area on the net approximately in the 3rd minute is designated as a grain stagnation area. In order to form the downstream area 30, the downstream area 29, 30,
Grain flow rate sensors 10 and 10' having rotating blades 10a and 10'a, respectively, are installed on a support 11 disposed above the net 32. Further, the grain flow rate sensors 10, 10' are connected to the automatic control section 6 by a connecting cord 3.
Connected at 4. The automatic control unit 6 has detection circuits 7, 7', an amplifier circuit 8, and a control circuit 9, and a switching device 27 is connected to the control circuit 9 to switch between automatic electric drive and manual electric drive. It is possible. Next, the amplifier circuit 8 includes an operational amplifier 33,
33' and one input terminal of each,
The above detection circuits 7 and 7' are connected, and the other input terminal is connected to the variable resistor VR ₁ and VR ₂ , and the + side is connected to the resistor.
Resistors R ₂ and R ₃ are connected to the negative sides of R ₁ and R ₄ , respectively.
_The bases of transistors Tr ₁ and Tr ₂ are connected to the output terminals of the operational amplifiers 33 and 33'.
The collector of Tr ₂ is connected to the + side via the control circuit 9, and the emitter is connected to the - side.

The control circuit 9 is connected to a drive device 5 consisting of a motor or the like, a drive fitting 13 is fixed to a driving shaft 12 of the device 5, and a drive connecting rod 14 is attached to the free end of the drive fitting 13. One end is suspended, and the other end is suspended from a connecting fulcrum metal fitting 15 which is rotatably installed on the fuselage frame 1 with a connecting fulcrum 17 as a pivot. An upper mesh adjustment lower shaft 16 is attached to one end of the connection fulcrum metal fitting 15.
is fitted into the lower shaft fittings 22, 22' provided on the wooden frames 31, 31' of the above-mentioned tengoku upper net 3, and supports the lower side of the ten thousand stone upper net 3. Furthermore, the above-mentioned connection fulcrum fitting 15
One end of an upper shaft operating rod 18 is suspended at the other end, and the other end of the upper shaft operating rod 18 is an upper shaft metal fitting 19 fixed to one end of an upper mesh adjustment upper shaft 35 horizontally suspended within the fuselage frame 1.
suspended from the free end of the Upper shaft support fittings 20, 20' are fixed to the upper net adjustment upper shaft 35, and the ends of the fittings 20, 20' support upper shaft support rings 21, 21' installed in wooden frames 31, 31'. to support the upper side of the Mangoku upper net 3.

In addition, in the figure, 4 is a lower net, 23 is a milling rice ring conveyor, 24 is a mangoku funnel ring conveyor, 25 is a finishing rice conveyor, and 26 is a winnow.

Since the present invention is constructed as described above, the various parts are activated by predetermined operations, the unhulled rice is introduced into the unillustrated removing device (not shown), and the polished rice is transferred to the Mangoku funnel 2 after being subjected to wind sorting, etc.
If the rolled rice is transferred to the top net 3 and allowed to flow down from above, it either leaks into the middle and bottom net 4 or flows down while sliding down the net 32 along the slope of the top net 3. At this time, the rotating blades 10 of the grain flow rate sensors 10, 10'
At points a and 10'a, a collision of the sliding rice corresponding to the flow velocity of the flowing rice occurs. The collision force is 10
a, 10'a is caused to rotate. The rotation speed thus obtained is converted into a pulse signal by the grain flow rate sensors 10, 10', and this signal is sent to the detection circuits 7, 10'.
Sent to 7'. The detection circuits 7 and 7' differentiate and integrate the pulse signal, detect it as a voltage change, and send it to the amplifier circuit 8. In the amplifier circuit 8, operational amplifiers 33 and 33'
are input with reference voltages set by variable resistors Vr ₁ and Vr ₂ , respectively, and each voltage change sent from the detection circuits 7 and 7' is compared with the reference voltage, and depending on the level, the operational amplifiers 33 and 33 The output of ' is turned on and off, and the output controls the base currents of transistors Tr ₁ and Tr ₂ . The control circuit 9 is connected to the collectors of the transistors Tr ₁ and Tr ₂ , and when the output signals from the operational amplifiers 33 and 33' are ON/ON, the driving shaft 12 rotates in the normal direction.
It is configured so that it stops when it is ON or OFF, and reverses when it is OFF or OFF. Here, in FIGS. 1 and 2, the grain flow lower region 29 and the grain stagnation lower flow region 30
It is only necessary to control the slope of the net 32 so that the branching point of 1 is maintained between the sensors 10 and 10'.
Looking at the rotational speeds of the sensors 10 and 10' when the slope is appropriate, the sensor 10 is fast and the sensor 10' is slow, so the movement of the net 32 is stopped. When both the sensors 10 and 10' are rotating quickly, the grain flow region 29 is below the sensor 10', and the branching point between the grain flow region 29 and the grain stagnation flow region 30 is moved upward. When the need arises, the slope of the net 32 moves in a gentle direction until the above-mentioned branch point comes between the above-mentioned sensors 10, 10' and stops, and the flow becomes approximately "7 minutes flow with 3 minutes stagnation".
Conversely, if both the sensors 10 and 10' are at low rotation or stopped, the branch point is the sensor 1.
The area above 0 or the entire surface is the above-mentioned stagnation lower area 30,
Since it is stagnant, the slope of the net 32 moves in a steep direction until the branch point comes between the sensors 10 and 10' and stops. This is the basic operation of this device, but there is a sudden and large difference in the flow velocity between the grain flow region and the grain stagnation region, and the upper sensor 10 detects the grain flow region, and the lower sensor 10' detects the grain stagnation region. In order to detect the downstream region and more accurately locate the branch point between both sensors 10, 10', an operational amplifier is used to compare the output voltages of the detection circuits 7, 7' with the outputs of the upper and lower sensors 10, 10'. It is better to set the reference voltages 33 and 33' to different set values corresponding to the flow velocities of the grain flow region and the stagnation flow region, respectively. For example, in the grain downstream area,
Assuming that the upper sensor 10 is rotated at more than 50 rpm in any case, and the lower sensor 10' is rotated at no more than 40 rpm in the lower grain flow region, the reference voltage of the operational amplifier 33 for the upper sensor 10 is set to the voltage equivalent to 49 rpm. The reference voltage of the operational amplifier 33' for the lower sensor 10' is set to a voltage corresponding to 41 rpm. In other words, when the rotation of the upper sensor 10 becomes 49 rpm or less and it no longer detects the grain flow downstream area, the slope of the upper screen 3 is made steep, and the rotation of the lower sensor 10' becomes 41 rpm or more and it no longer detects the grain flow downstream area. When this happens, make the slope of the upper screen 3 gentler. As mentioned above, the driving shaft 12 of the drive device 5 rotates forward and backward by the output from the automatic control unit 6, so that the drive fitting 13 rotates, the drive connecting rod 14 moves up and down, and the connecting fulcrum fitting 15 rotates. It rotates about the connection fulcrum 17, and the upper net adjustment lower shaft 16 swings up and down accordingly. At the same time, the upper shaft metal fitting 19 is slid by the operation of the upper shaft operating rod 18, the upper screen adjustment upper shaft is rotated, and the upper screen supporting metal fittings 20, 20' are slid to cause the upper side of the upper net 3 to swing up and down.

If the switching device 27 is set to manual electric drive, the operation of the grain flow rate sensors 10, 10' is canceled, and the drive device 5 is manually operated preferentially to adjust the slope of the mangeki upper net 3. can.

According to the present invention, the grain flow rate sensor 10,1
Sensors 10 and 10' are provided opposite to each other at positions on the net 32 of the Mangoku upper net 3 where the grain flow area 29 and the grain stagnation flow area 30 are to be formed, respectively, and the sensors 10 and 10' measure the grain flow rate and the grain flow rate. The upper net gradient is adjusted by recognizing that the stagnation velocity of the grains has disappeared, so it is quickly adjusted to the optimum condition. Therefore, the Mangokujo net3 does not depend on the individual operator's ability.
Gradient adjustment can be made accurately and quickly, operator monitoring is unnecessary, sorting performance and efficiency are maintained at a high level, and rice hulling work can be easily carried out. Further, it is also possible to add an adjusting device so that the position of the grain flow velocity sensor disposed as described above can be changed as appropriate depending on the variety of grain and the moisture content.

The grain flow rate sensor of the present invention has rotating blades 10a and 10'a having substantially the same rotation radius, but if the rotating blades 10a and 10'a are installed with different rotation radii, two The electrical signals can also be processed into control signals at the same set level.

As described above, the drive mechanism and the grain flow rate sensor in the present invention are not limited to the above-mentioned embodiments, and may be any mechanism or sensor as long as it is a mechanism that swings the tengekoku upper screen and a sensor that detects the flow rate of the grains, respectively. Of course.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a schematic side view of the main parts of a rice huller, FIG. 2 is a perspective view, and FIG. 3 is an electric circuit diagram. In the diagram, 1... fuselage frame, 2... mangoku funnel, 3...
Mangoku upper net, 4... Middle lower net, 5... Drive device, 6...
... automatic control section, 7, 7' ... detection circuit, 8 ... amplifier circuit, 9 ... control circuit, 10, 10' ... grain flow rate sensor, 10a, 10'a ... rotary vane,
11... Support body, 12... Driving shaft, 13... Drive fitting, 14... Drive connection rod, 15... Connection fulcrum metal fitting, 16... Upper net adjustment lower shaft, 17... Connection fulcrum,
18...Upper shaft operating rod, 19...Upper shaft bracket, 20,
20'...Upper shaft support fitting, 21, 21'...Upper shaft support ring, 22, 22'...Lower shaft fitting, 23...Rice mill ring source conveyor, 24...Mangoku funnel ring source conveyor,
25...finishing rice conveyor, 26...karawine, 27...
...Switching device, 28... Rectifier circuit, 29... Grain flow area, 30... Grain stagnation flow area, 31, 31'...
Wooden frame, 32... Net, 33, 33'... Operational amplifier,
34...Connection cord, 35...Upper net adjustment upper axis,
VR ₁ , VR ₂ ... variable resistor, Tr ₁ , Tr ₂ ... transistor, R ₁ , R ₂ , R ₃ , R ₄ ... resistance.

Claims (1)

[Claims] 1. A mangok upper net built within the frame of the machine is installed so that its inclination angle can be changed by the drive device of the automatic control unit, and the grain flow velocity is set at the position on the mangok upper net that should be the lower grain flow area and the grain stagnation flow lower area. A sensor is connected to the automatic control section, and the sensor installed in the upper grain flow area detects the value (flow velocity) that recognizes the grain stagnation flow, and the lower grain flow rate sensor provides the value (flow velocity) that recognizes the grain stagnation flow. This is an automatic adjustment device for the mangoku upper net of a rice huller that is characterized by making the flow rate higher (faster) than the value (flow velocity) that recognizes the flow of grains.