JPS597629A - Fixed amount conveyor discharge control method - Google Patents

Abstract

PURPOSE:When discharging mud stored in a hopper, to perform fixed amount discharge accurately by detecting the average level of the stored mud and the rotation of conveyor to calculate the discharging amount then comparing with the setting level and correcting the error. CONSTITUTION:The average level H of the mud 3 stored in the hopper 1 is detected by a level detector 11 to produce the level signal while the rotation (s) of the screwconveyor 2 is detected by a rotation detector 6 to produce the rotation signal. The formula for calculating the discharge amount of conveyor 2 from said H and rotation (s) is stored in the discharge amount arythemetic unit 8. The level H signal and the rotation signal (s) are provided to said unit 8 to calculate the discharge amount. Said discharge amount is compared with the setting level to control the rotation (s) of conveyor 2 on the basis of the difference to match the discharge amount with the setting level.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a screw and a bolt provided at the bottom of a hopper for handling items such as bulk materials stored in a hopper Z.

This invention relates to a quantitative discharge control method when discharging with an apron, vibration conveyor, etc., and is particularly suitable for quantitatively discharging muddy substances such as sludge.

In order to discharge the handled items from inside F, the discharge mechanism usually installed at the bottom of the conch/ξ, such as a screw, a belt conveyor, or a vibrating feeder, is used, but if the stored amount is small or If the hollow height is low, you can set the screw rotation speed, the driving speed of the belt conveyor, the rotation speed of the vibration motor of the photographic feeder (the number of images), etc. Quantitative discharge was possible without any control.

However, as the hopper groove becomes larger or the hopper height increases, the pressure at the discharge port will fluctuate depending on the height of the stored material, and if the rotation speed of the discharge mechanism is fixed, the discharge amount will fluctuate. No, quantitative discharge was difficult. In particular, it has been difficult to determine and discharge fluid fluids such as sludge.

An example of conventional constant discharge control σ) is shown in FIG. 1 is a hopper, which is equipped with a screw 2 at its bottom to transfer stored material 3 and discharge it from an outlet 4. 5 is a conyer scale that detects the amount of discharge.

6 is a screw 20 rotation speed detection device, 7 is a rotation speed increase/decrease device, 8 is a discharge amount calculator, 9 is a discharge amount indicating controller, 10
is a screw 20 rotation speed indicating controller. Con may also use a horame scale, an innoctoline flow meter, etc. instead of the Yascale 5.

For control, the controller detects the arithmetic function using a scale 5, etc., calculates the emission amount using the emission amount calculator 8, compares it with the set emission amount, and based on the deviation, rotates based on the signal from the rotation speed indicating controller IO. Stationary discharge was performed by operating the number increase/decrease device 7 to change the screw 20 rotation speed (the driving rotation speed for a -?rutocon R-ya, the vibration frequency for a vibration feeder).

However, in such a configuration, 4f
If the material to be handled has fluidity, the Konbaya scale is 5.
There were many problems such as adhesion to surfaces, etc., which caused significant errors in measuring the discharge amount, making stable stationary discharge difficult.

To prevent this, use a rotary 9 cell or Shibaru meter as shown in Figure 2. The Shibaru detector 11 detects the Shibaru within 1. Detecting a decrease in the storage amount within 1, detecting the discharge amount by differentiating this decrease with the discharge amount calculator 8, comparing the set value and the calculated value,
However, this method can be applied to batch-type operations or continuous busy operations where the stored material does not fluctuate due to a conveyor, etc. ! However, if the input amount fluctuates or is intermittently inputted, the amount of stored material will fluctuate, making calculation of the discharge amount inaccurate and making operation difficult. Met.

The present invention eliminates the above-mentioned drawbacks of the conventional method, and provides a conveyor belt discharge system that can compensate for frequent fluctuations in the accumulated material and perform stable and accurate stationary discharge. The purpose is to provide a control method.

The present invention provides a conveyor fixed-feed discharge control method for discharging materials stored in a hopper in a stationary manner by a conveyor provided at the bottom of the hopper ξ. directly or indirectly detects the rotation speed of the condenser, outputs a rotation speed signal, detects the rotation speed of the condenser, and outputs a rotation speed signal, and the condenser discharges the condenser from the rotation speed and the rotation speed. A calculation formula for calculating the amount is stored in a calculation device, the above-mentioned signal and the rotational speed signal are inputted into the calculation device to calculate the discharge amount, and the calculated discharge amount and the set discharge amount are calculated. The conveyor is a quantitative discharge control method characterized in that the number of revolutions of the conveyor is controlled based on the deviation and discharge is carried out at a predetermined time.

An embodiment 1j of the present invention will be explained using the drawings. In Figure 3, 11 is the average of the accumulated material 3 in the hopper.
This is a high-frequency detector that detects As the detection end of the shibari detector 11, in addition to the method of directly detecting the average shibari using an electrical, mechanical, optical, acoustic, etc. A method is also used in which H is detected and averaged from this trap and N is calculated indirectly.

There is a relationship as shown in FIG. 4 between the discharge amount Q of the screw, which is a conveyor, and its rotation speed S.

In reality, there may be relationships such as ■ or ■, but to simplify the explanation, we will assume that it is a straight line ■. Let this relational expression be Q=αS (1).

Second, when the screw rotation speed S is kept constant, the relationship between the height H of the accumulated material 3 in the hopper and the discharge amount Q (''=α) is as shown in Figure 5, and in reality, the numbers ■ and ■ are shown. For simplicity, we assume that the straight line is 6.In this case, the relational expression is α=BH+A (2).From (1) and (2), Q=(BH+A) S...Mark...(3)This(3)
The formula is stored in the emission amount calculator 8.

The signal of the H value given from the engine speed detector 11 and the signal of the S value given from the rotation speed detection device 6 are manually input to the discharge 1 calculation a8, and the calculation of equation (3) is performed. tQ
Play S. This calculated discharge amount is compared with the set value, and based on the deviation, the screw 20 rotations 6s are controlled to control the discharge amount so that it matches the set value.

Above, we have explained the pressure when a screw is used as a conveyor based on Fig. The number of rotations or the number of rotations of the vibration motor may be controlled as described above.

In addition, in the case of a conveyor without rotating parts, such as an 'it magnetic feeder, or a pneumatic or hydraulic vibration feeder,
The imaging frequency may be controlled instead of the rotation speed described above.

The meaning of "rotation speed" described in this specification also includes such "vibration frequency."

According to the present invention, the ejection device does not come into contact with the stored material, so there is no risk of an accident due to adhesion. It is possible to provide a continuous quantitative discharge control method that can stably control the discharge amount by performing computations even if the fluctuations in the fuel flow are large, and can have extremely great practical effects.

[Brief explanation of drawings]

Figures 1 and 2 are flow diagrams of the conventional example, Figure 3 is a flow diagram of the embodiment of the present invention, Figure 4 is a graph showing the relationship between the screw rotation speed and the amount of discharge, and Figure 5 is the inside of the hollow chisel. It is a graph showing the relationship between the amount of stored material and the amount of discharge. l...hopper, 2...screw, 3
...Storage, 4...Exit, 5-...
...Conveyor scale, 6...Rotation speed detection device, 7-....Rotation speed increase/decrease device, 8-...Emission amount calculator, 9...Emission Volume indicating controller, 1G...
...Rotation speed indicating controller, 11...Shibaru detector. Month - eleven

Claims (1)

[Claims] 1. In a conveyor constant discharge control method, in which the material to be handled stored in a conch/channel is discharged in a fixed amount by a conveyor provided at the bottom of the hopper, the amount of material stored in the hopper is directly or indirectly detects and outputs a signal, detects the number of revolutions of the conveyor and outputs a number of revolutions signal, and determines the amount of emissions from the conveyor from the number of revolutions and the number of revolutions. an arithmetic expression for calculating the engine speed is stored in the arithmetic device, the above-mentioned signal and the rotational speed signal are inputted into the arithmetic device to calculate the displacement amount, and the calculated exhaust amount and the set emission amount are calculated. 1. A conveyor quantitative discharge control method, characterized in that the number of revolutions of the conveyor is controlled based on the deviation to perform a predetermined number of discharges.