JPS62237323A - Measuring instrument for amount of particles stored in particle storage silo - Google Patents

Abstract

PURPOSE:To easily take a measurement speedily by measuring particles stored in a particle storage silo by a noncontacting method. CONSTITUTION:Air is pressed in a silo bin 1 by an air press-in pump 6 and the amount of the pressed-in air is detected by a flow meter 8 incorporated in a duct 7. Further, the air pressure in the silo bin 1 is detected by a pressure sensor 10 arranged in the silo bin. Further, detected values of the flow meter 8 and sensor 10 and temperature detected values of temperature sensors 11 and 11' are converted into electric signals, which are inputted to a computing element 12. Consequently, the computing element 12 computes and measures the storage amount of grains 4 in the silo bin 1 by using a specific expression. Thus, the storage amount is measured by the noncontacting method, so the measuring operation is performed regardless of the surface shapes and properties of the grains 4.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a device for measuring the amount of material stored in a powder storage silo such as a grain silo.

(Prior art) There is no accurate method for measuring this, and each time, as shown in Figure 2, a person has to use a weight ( '& lower it, bring it into contact with the top surface of the powder or granular material (#) in the cyrobin, and measure the distance M from the same surface to the top of the cyrobin.

However, since the measurement points are limited, the shape of the powder or granule stored in the silobin has been visually determined, and in conjunction with the above measurement value, the jtY of the same powder or granule has been simply determined.

(Problem to be solved by the invention) Therefore, the values measured by the conventional method are only a guideline,
It is not possible to accurately determine the amount of material stored in the mouth of the rhinoceros, and each time a measurement is made, a person must climb to the top of the rhinoceros robin, requiring a large amount of labor. : It took.

(Means for solving the problems) The present invention aims to solve these problems,
A pump for pressurizing air into the sealed silobin, a pressure sensor for detecting the amount of air pressurized by the pump, which is installed in an air supply line of the same pump to the silobin, and an amount of air pressurized inside the silobin by the flow meter and the pressure sensor. It is also characterized by a calculation device that converts the detected value of the air pressure inside the silobin into an electrical signal and inputs it to calculate the amount of stored material in the silobin.The purpose of this is that it is easy to measure. The object of the present invention is to provide a device for measuring the amount of material stored in a powder storage silo, which can be quickly and accurately measured, and can also be measured unattended.

(Function) The present invention provides that when air is injected into a completely sealed container with a certain volume, the air pressure inside the container is constant depending on the voids in the container and the amount of injected air, assuming the temperature of the air is constant. This method was proposed based on the fact that air is injected into a sealed silobin by the air injection pump, and the amount of air injected into the silobin at this time is calculated by dividing the amount of air between the pump and the silobin. Detecting the air pressure in the silobin with a flow meter installed in the communicating air supply pipe, and detecting the air pressure in the silobin with a pressure sensor, and detecting the air pressure in the silobin with the pressure sensor;
The amount of air injected into the silo robin detected by the flow meter is converted into an electrical signal and inputted to a calculation machine to calculate the amount of air stored in the silo robin.

(Effects of the Invention) As described above, according to the measuring device of the present invention, the amount of stored material in the powder storage silo is measured by a non-contact method, so the amount of stored material can be measured regardless of the shape and properties of the stored material. It is possible.

Further, according to the device of the present invention, it becomes possible to measure the amount of stored material in a powder storage silo unattended, and furthermore, highly accurate measurement values can be obtained regardless of the skill of the foot measurer.

(Example) The present invention will be described below with reference to the illustrated embodiments.

(1) is Cyrobin, (2) is an airtight discharge gate,
(3) is a feeding chute with an airtight mechanism, (4) is grain stored in the silobin (1), (5) is the silin robin (1)
This is the void inside.

(6) is an air pressure pump, and the air supply pipe (7) connects the discharge side of the pump (6) and the silobin (1).
A flow meter (8) for detecting the amount of air injected into the silobin (1) by the pump (6) is interposed therein.

In the figure, (9) is an air duct connected to the suction side of the pump (6).

A pressure sensor 0u that detects the air pressure inside the silobin (1) is installed inside the silobin (1).
) and outside of Cyrobin (1) is a temperature sensor αIN.
There are 11 installed.

These temperature sensors also detect temperature changes in the air.
1) Since temperature-based correction is required to vary the air pressure value in 1), this is used for this correction.

(12+ is a computer, the flow meter (8), pressure sensor 0
ω, temperature sensor 0υ (11) The detected value by the temperature sensor 0υ is converted into an electric signal and calculated based on the formula described later, and the amount of grain (4) stored in the cyrobin (1) is measured.

In addition, when measuring the storage amount, if the air inflow amount and internal pressure rise characteristics at the time when the silobin (1) is empty are measured in advance, the volume of the silobin (1) can be known more accurately. Be able to do that.

Furthermore, if the amount of air injected for each stored R amount and the characteristic value of the pressure increase inside the silobin are measured in advance when a known amount of grain is stored, even more accurate measurement is possible.

Since the illustrated embodiment is configured as described above, air is pressurized into the silobin (1) by the air pump (6), and the amount of pressurized air to the silobin (1) at this time is adjusted to ), the air pressure inside the silobin (1) is detected by a pressure sensor α0) installed in the silobin (1), and the flowmeter (8) The detected value by the pressure sensor αQ, and the temperature detected value by the temperature sensor (old) (11') are converted into electrical signals and input to the computer a3. Grain (4
) is measured.

Now, it is assumed that the cyrobin has no air leakage and its volume VO does not change due to the internal pressure P of the cyrobin, and the volume of the void inside the cyrobin is 1. The grain volume i- is ■2, the grain weight is M, the grain specific gravity is ρ, and the amount of pressurized air inside the silobin is Q.
Then, the weight of the grain in Suiropin is measured by the following formula.

■o=v0+v2 p=VO-Q KP=v1・Ql・tl Where, K: Pressure increase coefficient tl: Volume of the void inside the cyrobin ■
By determining the relationship with 1, I Vl -P-t1' Therefore, the grain weight M can be determined by the following formula.

M-Pv2-P (To-Vl) -P (Vo-'
-P-tl)Ql As described above, according to the above embodiment, since the amount of grain (4) stored in the silobin (1) is measured by a non-contact method, the surface shape and properties of the grain (4) can be measured. It becomes possible to measure the storage amount of the same grain (4) regardless of the situation.

Further, according to the above embodiment, the grain (4) in the cyrobin (1)
) can be measured unattended, and highly accurate measurement values can be obtained regardless of the skill of the measurer.

Although the present invention has been described above with reference to embodiments, the present invention is, of course, not limited to such embodiments, and can be modified in various designs without departing from the spirit of the present invention. .

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of a device for measuring the amount of stored material in a powder storage silo according to the present invention, and FIG. 2 is a vertical cross-sectional view of a conventional measuring device. <IJ... Cyrobin, (6)... Air pressure pump (7)... View supply pipe, (8)...
Flow meter (IQ...pressure sensor, αυ(11'
)...Temperature sensor α3...Calculating machine

Claims (1)

[Claims] a pump for injecting air into a sealed silobin; a flow meter for detecting the amount of air injected by the pump; and a pressure sensor for detecting air pressure in the silobin; A powder particle comprising a calculation device that converts the detected value of the amount of air injected into the silobin and the air pressure inside the silobin into electrical signals and calculates the amount of stored material in the silobin by the flow meter and pressure sensor. A device for measuring the amount of material stored in a body storage silo.