JPH01207124A - Grain mixer - Google Patents

Abstract

PURPOSE:To always maintain the same mixing ratio by accurately weighing the grain of different kinds and qualities charged in respective grain tanks, discharging the grain at a flow rate in accordance with the mixing ratio, and successively providing a time interval between the start and end of the discharge. CONSTITUTION:Plural grain tanks 1-5 are arranged in parallel above a conveyor means 13 for conveying grain almost in the horizontal direction at a constant speed, and the weight-discharging devices 6-10 consisting of a weigher and a variable-quantity discharge means are provided to the lower ends of the respective tanks. In addition, the devices 6-10 are driven by an arithmetic controller 45 based on the grain weight mixing ratio inputted from a mixing ratio inputting means 48 to discharge the grain in the respective tanks at the inputted and set mixing ratio, the grain in the tanks are discharged and overlapped by the variable-quantity discharge means, and the variable quantity discharge means are successively started and stopped from the leading side of the conveyor means 13 at time intervals.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a grain mixing device for mixing grains, such as polished rice, in a predetermined weight ratio.

[Conventional technology]

A conventional grain mixing device of this type made by the present applicant will be explained with reference to FIG. Variable discharge valves V1 to V5 are provided at the discharge ports of a plurality of preliminary mixing tanks T+-T5 arranged in parallel above the conveyor C, a volumetric weight measuring device for measuring the volumetric weight of each mixed grain, and a volumetric weight measuring device for measuring the volumetric weight of each mixed grain; The rotation speed of each of the variable discharge valves is calculated based on the volumetric weight of each mixed grain measured by the weight measuring device and the grain mixing ratio input and set by the input means, and the rotation speed of each of the variable discharge valves is calculated.
- A computer control device for discharging grains from T5 at a predetermined weight mixing ratio; This is communicated to the arithmetic and control unit, and as a result, from the start of discharge to the end of discharge, all the grains discharged from each of the preliminary mixing tanks T1 to T5 are conveyed while merging together, so that uneven mixing does not occur (specially (Refer to 150823, 1983).

[Problems to be Solved by the Invention] By the way, as mentioned above, in a device that uses a variable discharge valve such as a rotary valve to discharge a fixed amount based on a predetermined volumetric weight, Since this method does not actually measure the weight of the grain being discharged, there is a problem in terms of weighing accuracy. In addition, since the discharge is carried out continuously over a long period of time, the flow rate changes greatly during discharge, and even if the discharge from each tank is completed at the time difference set at the start of discharge, each grain may not polymerize accurately to the end. , mixed spots at the end of discharge were unavoidable.

This invention aims to provide a grain mixing device in which the grains discharged from each tank are uniformly merged and conveyed until the end, and the amount discharged from each tank, that is, the mixing ratio is accurate. This will be a major issue.

[Means for solving problems]

In order to achieve the above object, in the grain mixing device of the present invention, a metering and discharging device consisting of a measuring device and a variable discharge amount discharging device is provided at the lower end of each grain tank arranged in parallel above the conveying means, and the mixing ratio is Each metering and discharging device is driven according to the grain mixing ratio inputted from the input means, and the grains in each grain tank are discharged from beginning to end at the input set mixing ratio and all the grains in each grain tank are polymerized and discharged. Accordingly, an arithmetic and control device is provided for determining the discharge flow rate of each of the variable discharge amount discharge means and for sequentially operating and stopping the variable discharge amount discharge means with time differences.

The variable discharge means is comprised of a discharge hopper with a discharge port at its lower end, a valve that increases or decreases the opening of the discharge port according to the mixing ratio, and an electric motor with a reversible servo mechanism that operates the valve. Alternatively, the variable discharge amount discharge means may be a vertical rotary valve connected to the discharge port and equipped with an electric motor with a servo mechanism that controls the rotation speed according to the mixing ratio.

Further, it is preferable that the discharge hopper is provided with a level switch for correcting the discharge flow rate.

[For production]

Grains of different types and qualities placed in each grain tank of the grain mixing device configured as described above are accurately weighed with a scale according to the mixing ratio inputted from the mixing ratio input means. Furthermore, the variable discharge amount discharge means discharges at a flow rate according to the mixing ratio, and since there is a time difference between the start and end of discharge, the same mixture ratio is maintained throughout.

Further, a discharge hopper is provided below the meter, and the opening of the discharge port of the discharge hopper is increased or decreased by a valve to determine the outflow, or the flow rate is changed depending on the rotation speed of a tally valve, The grains are weighed in advance using a weighing device and are discharged at each weighing station according to the mixing ratio.

Furthermore, a level switch installed in the discharge hopper detects the flow of grain in the discharge hopper, and corrects the discharge flow rate according to the properties of the grain.

[Embodiment of the Invention] Hereinafter, a preferred embodiment of the present invention will be described based on the drawings. FIG. 1 is a schematic view of the grain mixing device, and FIG. 2 is a partially enlarged detailed view of FIG. 1.

At the lower ends of the grain tanks 1 to 5 which are arranged in a straight line, metering and discharging devices 6 to 10 are respectively provided, and metering and discharging devices 6 to 10 are respectively provided.
A belt conveyor 13 that is rotationally driven by a pair of rollers 11 and 12 is installed horizontally below the belt conveyor 10 . One roller 11 is interlocked by an electric motor 14 and a chain 15.
Further, a grain lifting machine 16 is installed upright on the conveying end side of the belt conveyor 13. It goes without saying that the conveyance means may be a flow conveyor or the like instead of the belt conveyor 13.

A grain frying machine 17 is installed upright on the side of a series of grain tanks 1 to 5, and a discharge port of the grain frying machine 17 and each grain tank 1 to 5 are installed vertically.
The input ports 18-22 at the upper end are connected by a chute pipe 23 and switching valves 24-27.

Next, the metering and discharging devices 6 to 10 will be explained. An inner valve 29 and an outer valve 30 are suspended from each outlet 28 at the lower end of the grain tanks 1 to 5 by shafts 31, and an inner valve solenoid 32 and an outer valve solenoid 33 are respectively installed. When these solenoids are energized, the shaft 31
The inner valve 29 and the outer valve 30 are formed to rotate upwardly to open the outlet 28.

Note that the inner valve 29 is formed with an opening (not shown) for discharging a small amount.

A weighing hopper 35 having a discharge port 34 is disposed below each outlet 28, and the weighing hopper 35 is connected to the load cell 3.
6 to a discharge hopper 37 provided outside the weighing hopper 35. The dispensing port 34 of the weighing hopper 35 is equipped with an on-off valve 39 that is rotated by a servo motor 38 for reversible rotation, and the discharge port 40 at the lower end of the discharge hopper 37 is equipped with a slide shutter that can be slid by a servo motor 41. 42 are provided. That is, a pinion 43 pivotally attached to the shaft of a servo motor 41 for reversible rotation is engaged with a rack 44 formed on one side of the slide shutter 42, and the slide shutter 42 is slid by the rotation of the servo motor 41.
The opening degree of the discharge port 40 is made variable. Furthermore, level switches 49 and 50 are provided on the inner wall of each discharge hopper 37 at the top and bottom.

Each inner valve solenoid 32, outer valve solenoid 33, load cell 36, servo motor 38.41, and level switch 49.50 in the metering and discharging devices 6 to 10 are connected to an arithmetic control device 45 consisting of a microprocessor or the like. , furthermore, the arithmetic and control unit 4
5 is connected to a display 46, a printer 47 and a keyboard 48.

Hereinafter, specific operations in the above embodiment will be explained. Grain tanks 1 to 5 are filled with grains of different varieties and qualities, such as rice grains (polished rice), in advance in sequence through a grain lifting machine 17, a chute vibrator 23, and a switching valve 24. In addition, the drive circuits of each of the switching valves 24 to 27 are connected to the arithmetic and control unit 43, and the keyboard 4
It may be configured to automatically stake out based on the stakeout instruction signal inputted from 8.

Next, a desired mixing ratio and total weight are input from the keyboard 48 in order to mix the rice grains in each grain tank 1 to 5 based on the shipping and stocking plan. For example, the total weight is W
o, the weight mixing ratio of each grain tank 1 to 5 is 1:2:1
:2:4, the weights W1 to W5 to be discharged from each grain tank 1 to 5 are: W+ = WO/10 W2 = 2Wo/10W
3 = Wo /10 W4 = 2Wo /10W
s=4Wo/10. Then, in response to a metering start signal from the arithmetic and control device 43, the metering and discharging devices 6 to 6
10 begin weighing all at once. That is, by energizing each inner valve solenoid 32 and outer valve solenoid 33 to pull up the inner valve 29 and outer valve 30 and opening the outlet 28, the rice grains in the grain tanks 1 to 5 are transferred to the weighing hopper 35. leaks into In other words, the rice grains in grain tank 5, which has the largest mixing ratio, are weighed in increments of 30K (l), assuming that the measuring device's one-time measuring capacity is 30KO, and the rice grains in grain tanks 2 and 4 are 1/2 of that, 15K17. The rice grains in the grain tanks 1 and 3 are weighed in increments of 7.5KtJ, which is 1/4 of the rice grains in the grain tanks 1 and 3.Then, the weight of the rice grains in each weighing hopper 35 is measured by the load cell 36. When weight - IK ( ) is detected, the inner valve solenoid 32 demagnetizes the inner valve 2.
9 moves downward, rice grains flow out little by little from the opening of the small quantity discharge port provided in the inner valve 29, and when the rice grains reach a predetermined weight,
The outer valve solenoid 33 is demagnetized, the outer valve 33 moves downward, and the outlet 28 is closed. In this way, 1
When the time required for weighing, for example 6 seconds, is counted up, the servo motor 38 rotates to open the on-off valve 39, and the weighed rice grains are discharged all at once into the discharge hopper 37 from the dispensing port 34, and are placed in a predetermined amount. After a period of time (several seconds) has elapsed, the inner valve 29 and outer valve 30 move upward again to start the next measurement.

In this embodiment, measurement is performed with an accuracy of approximately ±2 g by large injection and small injection, but the accuracy may be further improved by using large injection, medium injection, and small injection.

On the other hand, the rice grains discharged into each discharge hopper 37 are discharged onto the belt conveyor 13 from the respective discharge ports 40 each time, and the opening degree of each discharge port 40 differs depending on the input mixing ratio. That is, the metering and discharging device 10
The servo motor 41 is driven by a predetermined rotation so that the discharge port 40 is fully opened, and the slide shutter 42 is slid in the opening direction via the pinion 43 and the rack 44.

Similarly, each of the discharge ports 40 of the metering and discharge devices 6 to 9 is set at 1/4.1/2.1/4 and 1/2 of the full opening.
Each servo motor 41 is driven.

In this way, by determining the opening degree of each discharge port 40 according to the mixing ratio, the mixing ratio can be kept constant. Moreover,
The timing to open each discharge port 40 is determined by the belt conveyor 1.
When the leading edge of the band of rice grains discharged onto the belt conveyor 13 from the grain tank 1 disposed closest to the conveyance start end of No. 3 reaches directly below each of the grain tanks 2 to 5, sequentially,
In order to start discharging with a delay, the arithmetic and control device 43 calculates the time difference between the operating times of each servo motor 41 from the intervals of the metering and discharging devices 6 to 10 and the speed of the belt conveyor 13, and outputs an operating signal. As a result, the rice grains fed to the 1M grain machine 16 are kept in a counter-flow direction from beginning to end, and the mixing ratio is kept constant.

When the first discharge is completed, each servo motor 41 rotates in reverse, operates the slide shutter 42, closes the discharge port 40, and simultaneously discharges the rice grains that have been weighed for the second time. Thereafter, repeat the weighing and discharging process to determine the total weight W.
Continue until o is reached.

In addition, when the level switch 49 attached to the lower part of the discharge hopper 37 does not detect "no grain" after a certain period of time, for example, 5 seconds after the servo motor 41 is driven, the level switch 49 disables the rice grains from the discharge port 49. It is assumed that the opening degree of is small, and the discharge port 40 is corrected slightly larger based on this signal. Conversely, when the state of "no grain" is detected before 4 seconds,
It is assumed that the opening degree of the discharge port 40 is large, and the calculation side m device 45
As a result, the servo motor 41 is driven to correct the opening degree of the discharge port 40 to a smaller value.

The level switch 50 mounted on the top is a safety switch that stops all operations when the discharge hopper 37 is filled with rice grains.

At the end of each discharge, the rice grains discharged from the grain tanks 1 to 5 are all overlapped until the end, as the discharge is completed sequentially to the metering and discharging devices 6 to 10 with the same time difference as at the start of discharge. There, they are merged.

Note that the rotary valve disclosed in the above-mentioned conventional example may be provided as the variable discharge amount discharge means. That is,
The supply port of the rotary valve is connected to the discharge port 40 of the discharge hopper 37, and an electric motor with a servo mechanism for driving the rotor valve is connected to the arithmetic and control unit 45, which determines the rotation speed according to the mixing ratio and sequentially The discharge is started and stopped with a time difference, and the same mixing ratio is maintained from the start to the end of discharge. In response to the signal from the level switch 49, the discharge flow rate is corrected by speeding up or slowing down the rotation of the rotary valve.

The grains supplied from the conveyance terminal end of the belt conveyor 13 to the supply section of the grain frying machine 16 are stirred while being fried by the grain frying machine 16, and the polymerization state is disrupted and mixed into pieces.
No special mixing equipment is required.

[Effects of the Invention] Since the present invention is configured as described above, it produces the effects described below.

A weighing and discharging device consisting of a weighing device and a variable discharge means installed below the weighing device is installed at the bottom of each grain tank, and the weight of the grain to be discharged is actually weighed and discharged each time, achieving extremely high accuracy. By weighing the grains and discharging them intermittently (batch processing), there is almost no error in the discharge flow rate, accurate mixing is possible, and grain counting management is facilitated.

By providing a discharge hopper with a discharge port at the lower end, a valve that increases/decreases the opening of the discharge port, and an electric motor that drives the valve as a discharge variable discharge means, it is possible to change the discharge volume with a simple structure. can.

Furthermore, by using a vertical rotary valve as the variable discharge amount discharge means, discharge is forcibly performed, and the discharge flow rate does not decrease due to bridging or the like.

Furthermore, by providing a level switch in the discharge hopper, the discharge flow rate determined from the mixture ratio is corrected, and changes in flow rate due to differences in grain properties are immediately corrected, so there is no unevenness in the mixture at the end of discharge.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an embodiment of the present invention, FIG. 2 is a partially enlarged detailed diagram of FIG. 1, and FIG. 3 is a schematic diagram showing a conventional example. 1-5 Grain tank, 6-10 Measuring and discharging device, 11-12 Roller, 13 Belt conveyor, 14 Electric motor, 15 Chain, 16-1
7...Grain frying machine, 18-22...Input port, 23...
Shoot pipe, 24-27...Switching valve, 28-
... Outlet, 29... Inner valve, 30... Outer valve, 31... Shaft, 32... Solenoid for inner valve, 33... Solenoid for outer valve, 34... Discharge port, 35...Measuring hopper, 3
6...Load cell, 37...Discharge hopper, 38.
...Savo motor, 39...Opening/closing valve, 40...Discharge port, 41...Servo motor, 42...Slide shutter, 43...Binion, 44...Rack,
45... Numbness control device, 46... Display device, 47...
・Printer, 48...Keyboard, 49.50...
·Level switch.

Claims (4)

[Claims] (1) A plurality of grain tanks are installed in parallel above a conveying means that conveys grain at a constant speed in an almost horizontal direction, and a measuring device is installed at the lower end of each grain tank, and a variable discharge amount discharging means is installed below it. A metering and discharging device is provided, and each metering and discharging device is driven in accordance with the grain weight mixture ratio inputted from the mixing ratio input means to discharge the grain in each grain tank at the input and set mixing ratio, and each The discharge flow rate of the variable discharge amount discharging means is determined so that all the grains in the grain tank are polymerized and discharged, and the variable discharge amount discharging means is sequentially started and operated at a time difference from the conveyance start end side of the conveyance means. A grain mixing device equipped with a computer control device for stopping. (2) The variable discharge amount discharge means includes a discharge hopper with a discharge port provided at the lower end, a valve that increases or decreases the opening degree of the discharge port, and by opening and closing this valve, the discharge port can be input and set to mix. 2. The grain mixing device according to claim 1, further comprising: an electric motor with a reversible rotation servo mechanism that adjusts the opening degree according to the ratio. (3) The variable discharge amount discharge means includes a discharge hopper with a discharge port provided at the lower end, a rotary valve connected to the discharge port, and a mixture ratio that is input and set by rotating the rotary valve at an arbitrary speed. The grain mixing device according to claim 1, further comprising an electric motor with a servo mechanism that has a rotational speed corresponding to the rotation speed of the grain mixing device. (4) The grain mixing apparatus according to claim 2 or 3, wherein the discharge hopper is provided with a level switch connected to an arithmetic and control unit for correcting the discharge flow rate.