JP3543281B2 - Control method in cereal sorting and weighing machine - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a control method for a cereal sorting and weighing machine that sorts and removes dust particles mixed in cereals and automatically weighs the selected cereals for each predetermined weight.
[0002]
[Prior art]
A cereal sorting and weighing machine in which a rotary spiral is provided inside a sorting net and the cereal to be sorted is lifted and moved by the rotary spiral while sorting and discharging swarf particles by the sorting net is disclosed in, for example, JP-A-60-202771. In addition, a grain sorting and weighing machine having a function of controlling the rotation speed of a rotary spiral body using a predetermined grain sorting rate and a grain flow rate in a sorting unit as control elements is disclosed in Japanese Patent Application Laid-Open No. 1-307479. It is described in the gazette.
[0003]
[Problems to be solved by the invention]
Is at this type of grain sorter, outflow cereals from the supply amount or sorting of cereals for sorting unit, or in accordance with the flow rate of the cereals in sorting section obtained by both the rotation speed of the rotating helix By performing the proportional control, it is possible to adjust the sorting rate of the cereal to be sorted, that is, the mixing ratio of the swarf particles in the granules. However, as a condition under which the proportional control can be accurately performed, the present inventor has found that a cereal of a certain amount or more must be retained in the sorting section.
[0004]
Therefore, a first object of the present invention is to set the rotation speed at the start of the rotary spiral relatively high in view of the above technical conditions, and the flow rate of the cereal in the sorting unit is in a small amount range and is a predetermined value. An object of the present invention is to provide a control method for a cereal sorting and weighing machine capable of accurately controlling the cereal sorting rate from the time of startup by performing control to return the rotation speed of the rotary spiral to the startup rotation speed when decreasing.
[0005]
Further, a second object of the present invention is to set a proportional constant when the flow rate of cereals in the sorting section is in a small range and proportionally controls the rotation speed of the rotating spiral body exceeding a predetermined value for each predetermined flow rate. By setting these values appropriately, control accuracy of the selection rate in the proportional control region is improved.
[0006]
Further, a third object of the present invention is to control the rotation speed of the rotary spiral with a preset delay time when the flow rate of the cereal in the sorting section is in a small range and increases or decreases from a predetermined value. Accordingly, it is an object of the present invention to provide a control method for a cereal sorting and weighing machine capable of accurately controlling the cereal sorting rate without abrupt change in the amount of retained cereal in the sorting section.
[0007]
[Means for Solving the Problems]
The present invention is configured as follows as technical means for achieving the above object.
[0008]
That is, the first method includes a rotary sorting net that discharges debris mixed in grains and a rotary spiral that lifts and moves the selected grains along the inner surface of the rotary sorting net. A grain sorting and weighing machine having a sorting unit and having a function of controlling the rotating speed of the rotating spiral as a control element with a predetermined grain sorting rate and the flow rate of the grain in the sorting unit, the starting rotating speed of the rotating spiral is Set relatively high, when the flow rate of the cereal in the sorting unit is a small amount range and exceeds a predetermined value, the rotational speed of the rotary spiral is proportionally controlled according to the flow rate of the cereal, from the predetermined value. When the rotation speed decreases, control is performed to return the rotation speed of the rotary spiral to the startup rotation speed.
[0009]
In the second method, in the first method, a proportional constant for proportional control is set stepwise for each predetermined flow rate .
[0010]
Further, the third method is that, in the first method or the second method, when the flow rate of the cereal in the sorting unit is in a small range and increases or decreases from a predetermined value, a predetermined delay time is set. It controls the rotation speed of the rotating spiral.
[0011]
[Action]
According to the first method of the present invention, when the flow rate of the cereal in the sorting unit is in a small amount range and exceeds a predetermined value, the rotation speed of the rotary spiral is proportionally controlled according to the flow rate of the cereal. When the value decreases from the set value, control is performed to return the rotational speed of the rotary spiral to the relatively high start-up rotational speed.At startup, the rotary spiral rotates at a relatively high speed, and the sorting unit appropriately performs proportional control. The amount of cereals required to perform the Also, during the sorting and weighing operation, even if the amount of cereals supplied to the sorting unit becomes smaller than the required amount, the rotating spiral similarly rotates at a high speed, and the required amount of grains is rapidly supplied to the sorting unit. Is done. For this reason, it is possible to accurately control the cereal sorting rate from the start.
[0012]
According to the second method according to the present invention, the proportionality constant when proportionally controlling the rotation speed of the rotating spiral body in which the flow rate of cereals in the sorting unit is in a small amount range and exceeds a predetermined value is set for each predetermined flow rate. Since the setting is performed stepwise, the control accuracy of the rotation speed of the rotary spiral with respect to the flow rate of the grains is high, and the change in the rotation speed of the rotary spiral with respect to the change in the flow rate of the grains becomes gentle, and the amount of retained grains in the sorting unit is reduced. Does not fluctuate rapidly. For this reason, control accuracy of the selection rate can be improved.
[0013]
According to the third method of the present invention, when the flow rate of cereals in the sorting unit is in a small range and increases or decreases from a predetermined value, the rotation speed of the rotary spiral is controlled with a predetermined delay time. Therefore, an overshoot or undershoot phenomenon due to a sudden change in the amount of cereal staying in the sorting section does not occur, and the cereal sorting rate can be accurately controlled.
[0014]
【Example】
1 and 2 illustrate a cereal sorting and weighing machine implementing the method according to the invention. The cereal sorting and weighing machine 1 includes a sorting unit 5 including a rotary sorting net cylinder 3 and a rotating spiral 4 provided inside the outer casing 2 of the grain sorting and weighing machine 1. The rotating spiral 4 of the sorting unit 5 includes a reduction mechanism. , And is rotationally driven by an electric motor. The rotary sorting net 3 is rotated at a lower speed and in the opposite direction from the rotary spiral 4 by the electric motor via a speed reduction mechanism, and the cereal sorting rate in the sorting unit 5 is determined by the rotary sorting net 3 and It is controlled by the number of rotations of the rotary spiral 4. The selection rate can be controlled only by the rotation speed of the rotary spiral 4. Reference numeral 6 denotes a cereal supply hopper, 7 denotes a tank for temporarily storing fine grains of sorted cereals, and an automatic opening / closing shutter 9 is provided at a delivery port 8 thereof. Reference numeral 10 denotes a control panel. A weighing scale (not shown) is arranged below the outlet 8, and the grains delivered from the outlet 8 are stored in a storage bag set thereon. The storage control is automatically controlled by the control panel 10. Reference numeral 11 denotes a waste particle discharge port, and reference numeral 12 denotes a residual particle discharge port.
[0015]
As shown in detail in FIG. 3, the control panel 10 has a display section 13 for setting weight, weighing weight and the like in the upper half, and a selection rate setting device 14 in the lower half. The selection rate setting device 14 is constituted by a rotary operation device, and the starting end of the operation rotation angle of the rotation operation device is an automatic selection rate setting section 15 for automatically holding a standard selection rate. The range of the operation rotation angle beyond the section 15 is defined as a manual selection rate setting section 16 for manually setting the selection rate. The rotary operation device constituting the selection ratio setting unit 14 is a variable resistor having a switch that switches every time the boundary between the automatic selection ratio setting unit 15 and the manual selection ratio setting unit 16 is alternately crossed. The control circuit for controlling the number of rotations of the electric motor that drives the rotary screen net 3 and the rotary spiral 4 is an inverter, and the control circuit is switched by the switch of the selection rate setting device 14 by the rotation operation. The configuration is such that the motor is controlled so that the number of rotations is determined in accordance with the resistance value due to the automatic sorting state or the rotation operation under operating conditions. Reference numeral 17 denotes a sorting rate display, which is configured by arranging a plurality of light emitting elements (for example, light emitting diodes) in an arc shape.
[0016]
In the automatic sorting state in which the sorting rate setting device 14 is switched to the automatic sorting rate setting section 15 in the automatic grain sorting and weighing machine 1 configured as described above, as shown in FIG. Is set relatively high, and when the cereal flow rate in the sorting unit 5 exceeds the predetermined value d1 in a small amount range, the predetermined delay time t1 (time preset in the range of 0 to 39 seconds) After the lapse of time, the rotation speed of the rotary spiral 4 shifts to a region in which the rotational speed is proportionally controlled in accordance with the flow rate of cereals. In this proportional control area, the proportional constant is set stepwise as d2, d3, d4, d5, d6, and d7 for each predetermined flow rate so that the proportional control is performed between the two. I have. In addition, when the proportional control tends to decrease from the predetermined value d2, the rotation of the rotary spiral body 4 is reduced to the rotation speed at the time of starting after a predetermined delay time t2 (a predetermined time in a range of 0 to 39 seconds) has elapsed. Control to return. Therefore, in the small amount range, the control output voltage of the inverter has a hysteresis characteristic due to the delay times t1 and t2.
[0017]
In this embodiment, d1, d2, d3, d4, d5, d6, and d7 are set as follows. Each of these values is the control output voltage (V) (analog output) of the inverter that controls the motor in the automatic sorting state (bale / hour). In addition, 1 bales = 60 kg. d1 = 3.90, d2 = 3.30, d3 = 3.45, d4 = 4.00, d5 = 4.30, d6 = 4.60, and d7 = 4.70.
[0018]
As described above, according to the method of the embodiment according to the present invention, when the flow rate of the cereal in the sorting unit 5 exceeds the predetermined value d1 in the small amount range, the rotation of the rotary spiral body 4 is set at a predetermined delay time. The rotational speed was proportionally controlled in accordance with the flow rate of the grains, and when the proportional control showed a tendency to decrease from a predetermined value d2, the rotational speed of the rotary spiral 4 was set to be relatively high after a preset delay time t2. Since the rotation speed is controlled to return to the starting rotation speed, the rotating spiral 4 rotates at a relatively high speed at the time of starting, and the sorting unit 5 is supplied with an amount of cereals required for accurately performing the proportional control. Also, in the middle of the sorting and weighing operation, when the amount of cereals supplied to the sorting unit 5 becomes smaller than the required amount, the rotating spiral 4 similarly rotates at a high speed, and the required amount of cereals is stored in the sorting unit 5. Supplied quickly. For this reason, the control of the cereal sorting rate is performed accurately from the start.
[0019]
Then, the proportionality constant is set stepwise as d2 to d7 for each predetermined flow rate in a region where the rotation speed of the rotary spiral 4 is proportionally controlled in accordance with the flow rate of the cereal in the sorting unit 5, so The control accuracy of the rotation speed of the rotary spiral 4 is high, and the change in the rotational speed of the rotary spiral 4 with respect to the change in the flow rate of cereals becomes gentle, so that the stagnant amount of cereal in the sorting unit 5 does not suddenly fluctuate. For this reason, control accuracy of the selection rate can be improved.
[0020]
【The invention's effect】
According to the first method of the present invention, when the rotation speed at the start of the rotary spiral is set relatively high, the flow rate of cereals in the sorting unit is in a small range and tends to decrease from a predetermined value. Performs control to return the rotation speed of the rotary spiral to the rotation speed at the time of startup, so that it is possible to accurately control the cereal selection rate from the time of startup.
[0021]
According to the second method of the present invention, the flow rate of the cereal in the sorting unit is a small flow rate range, and the proportionality constant when proportionally controlling the rotation speed of the rotating spiral body that exceeds a predetermined value is set to a predetermined flow rate. Each step is set in a stepwise manner, so that the control accuracy of the selection rate in the proportional control region can be improved.
[0022]
Furthermore, according to the third method of the present invention, when the flow rate of the cereal in the sorting unit is in a small amount range and increases or decreases from a predetermined value, the rotation speed of the rotary spiral is set at a predetermined delay time. , It is possible to accurately control the cereal sorting rate without abrupt changes in the amount of cereal staying in the sorting section.
[Brief description of the drawings]
FIG. 1 is an overall perspective view of a grain sorting and weighing machine according to the present invention.
FIG. 2 is a cutaway perspective view showing a main part of FIG.
FIG. 3 is a front view showing a main part of the control panel.
FIG. 4 is a characteristic diagram showing a control mode of the method according to the present invention.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 Grain sorting and weighing machine 2 Outer body 3 Rotating sorting net tube 4 Rotating spiral 5 Sorting unit 6 Grain supply hopper 7 Tank 8 Outlet 9 Automatic opening and closing shutter 10 Control panel 11 Debris grain outlet 12 Residual grain outlet 13 Display 14 Sorting Rate setting unit 15 Automatic sorting rate setting unit 16 Manual sorting rate setting unit 17 Sorting rate display

Claims (3)

A rotary sorting net that discharges debris particles mixed in grains, and a sorting unit that includes a rotary spiral that lifts and moves selected grains along the inner surface of the rotary sorting net, In a cereal sorting and weighing machine equipped with a function of controlling the rotation speed of the rotating spiral as a control element with the cereal sorting rate and the flow rate of the cereal in the sorting unit, the rotating speed at the start of the rotating spiral is set relatively high, When the flow rate of the cereal in the sorting section is in a small amount range and exceeds a predetermined value, the rotation speed of the rotary spiral is proportionally controlled according to the flow rate of the cereal, and when decreasing from the above-described predetermined value, the rotation of the rotary spiral is rotated. A control method for a cereal sorting and weighing machine, wherein control is performed to return the speed to the rotation speed at the time of startup. 2. The control method according to claim 1, wherein a proportional constant for proportional control is set stepwise for each predetermined flow rate . 2. The method according to claim 1, wherein when the flow rate of the cereal in the sorting unit is in a small amount range and increases or decreases from a predetermined value, the rotation speed of the rotary spiral is controlled with a predetermined delay time. 3. A control method in the cereal sorting and weighing machine according to 2.

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