JP2008070247A - Method and device for metering of flowing material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and device for metering of a flowing material capable of collecting part of the flowing material such as powder supplied continuously, and metering it accurately. <P>SOLUTION: The method is characterized in that a plurality of metering cells are allowed to cross from the sideward of a flow of the flowing material to be metered, and the volume of the flowing material supplied into a pocket of each metering cell per unit time is metered. The device includes a supply tube for supplying continuously the flowing material to be metered, a conveyance means arranged just under the supply tube and having an approximately horizontal conveyance surface, and the plurality of metering cells juxtaposed in the mutual contact state on the conveyance means. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a method and apparatus for measuring a fluid substance in which a certain amount of fluid substances such as powders and liquids supplied continuously are divided and collected in a measurement cell, and more particularly, a plurality of fluid substances arranged in contact with each other The present invention relates to a method and apparatus for measuring a flow material in which a single weighing cell is traversed laterally into a flow of flow material and the volume of the flow material supplied in the pocket of the measurement cell is measured.

  In general, as a technique for collecting a part of powder that is continuously supplied and weighing it, the powder placed on an impact flow meter or belt that measures the weight by the impact force when the powder falls A belt scale and a capacitance type flow meter for measuring the weight of the liquid are known.

  The impact flow meter measures the weight of the powder from the drop impact force of the supplied powder. In the belt scale method, the weight of the powder on the belt is measured in a state including the weight of the belt, and then the weight of the powder is measured by erasing the weight of the belt. Furthermore, the capacitance type flow meter is a method of measuring the weight of the powder by placing the powder to be weighed between the electrodes and measuring the capacitance.

However, none of the above-described conventional powder measurement methods can accurately measure the discharge amount of powder per unit time (hereinafter referred to as instantaneous flow rate), and the powder is continuously discharged. There was a problem that it was not possible to extract a part of the flow (hereinafter referred to as divided collection).
Accordingly, an object of the present invention is to provide a method and an apparatus for measuring a fluid substance that can be accurately measured by collecting a part of a fluid substance such as powder or liquid supplied continuously.

In order to achieve the above object, according to the method for measuring a flow material according to the present invention, a plurality of measurement cells are traversed from the side into a flow of a flow material such as powder or liquid to be measured, and the measurement cell is The volume of the fluid substance supplied in the pocket is measured.
In addition, a fluid substance metering device according to the present invention includes a supply pipe for continuously supplying a fluid substance to be weighed, a conveyance means disposed immediately below the supply pipe and having a substantially horizontal conveyance surface, and the conveyance means. And a plurality of weighing cells juxtaposed in contact with each other.
The conveying means may be a linear conveying belt or a measuring disk that rotates in a horizontal plane.
Further, the weighing cell is formed of a curved surface having a curved bottom surface of a pocket having an upper opening, and further, both side edges of the opening are configured in a knife edge shape.
Furthermore, the weighing cell is preferably composed of a conductive material.

According to the present invention, since the both side edges of the opening of the weighing cell pocket are formed in a knife edge shape, the flowing material such as powder is accurately prevented without leaving the flowing material on the edge of the weighing cell pocket during weighing. Can be divided into two pieces. In addition, since the measuring cell is made of a conductive material, static electricity is charged and the flowing substance such as powder does not adhere to the surface of the measuring cell, and the flowing substance can be divided and collected and accurately measured.
Furthermore, according to the method of the present invention, it is possible to easily perform divided sampling for extracting a part of the fluid substance from the flow of the fluid substance such as powder or liquid supplied continuously, and per unit time. It is possible to accurately and easily measure the volume of a fluid substance such as powder collected in a divided manner.

Embodiments of a method and apparatus for measuring a fluid substance according to the present invention will be described below with reference to the drawings.
FIG. 1 conceptually shows a fluid substance metering apparatus according to the present invention, and this embodiment shows an example in which the present invention is applied to powder as a fluid substance.
In the figure, reference numeral 1 denotes a powder quantitative feeder. Immediately below the supply duct 2 of the supply machine 1, a weighing conveyor 3 having a conveying surface substantially coincident with a horizontal plane is installed horizontally. The weighing conveyor 3 has a driving pulley 4 and a driven pulley 5 between which a conveyor belt 6 is wound.

  The driving pulley 4 is rotationally driven by an electric motor 7. The electric motor is preferably a variable speed inverter motor. By controlling the rotational speed of the driving pulley 4, the traveling speed of the conveyor belt 6 can be set freely.

  On the weighing conveyor 3, a plurality of weighing cells 8, 8,..., 8 are juxtaposed in contact with each other. The weighing cell 8 is constructed according to the present invention, and the details of the structure will be described with reference to FIGS. 2 to 4. The weighing cell 8 is constructed as a rectangular parallelepiped block 10, and a concave pocket is formed on its upper surface 8a. 11 is formed.

  The pocket 11 in the illustrated example is configured as an inner semi-cylindrical surface, and both side edges 11a, 11a of the opening are formed in a knife edge shape. Therefore, when the side surfaces of the plurality of weighing cells 8 are placed in contact with each other, as is apparent from FIG. 5, a flat region is not formed between them, and a knife-edge side edge 11a is formed. The The pocket 11 is not limited to the illustrated inner semi-cylindrical surface, and can be formed of an arbitrary curved surface having no corners.

Moreover, according to the present invention, it is important that the weighing cell 8 is made of a conductive material.
As such a material, MC nylon (registered trademark) which is a conductive material which is a kind of nylon polymer is preferably used because the weight of the measuring cell, that is, the tare can be reduced. The reason for using this conductive material is that when the inner surface of the pocket 11 of the measuring cell 8 is charged with static electricity, a part of the powder adheres to it and the capacity of the divided and collected powder cannot be accurately maintained.

Next, a method for measuring the powder of the present invention configured as described above will be described.
When the electric motor 7 is driven, the conveyor belt 6 travels in the right direction of the arrow in FIG. Along with this, a plurality of measuring cells 8, 8,... 8 are fed in a substantially horizontal direction from the side so as to cross the flow of the powder discharged downward from the metering feeder 1.

    During this time, the powder is charged in the pockets 11 of each weighing cell 8. The amount of powder charged in the pocket 11 of each measuring cell 8 is determined by the traveling speed of the measuring cell 8 and the discharge amount of the powder discharged from the metering feeder 1. In the present invention, the weight of the powder charged in the pocket 11 of the measuring cell 8 is measured while the measuring cell 8 passes through the powder flow per unit time. The volume may be measured instead of the weight.

    For example, as shown in FIG. 6, the side surfaces of 60 weighing cells 8, 8,... 8 are brought into contact with each other and arranged in a row, and they pass through the powder flow over 1 minute. Then, the powder is charged for one second in one weighing cell 8. As a result, a predetermined volume of powder is divided and collected.

    The volume of the powder charged in the measuring cell 8 can be easily adjusted by adjusting the discharge amount of the powder discharged from the quantitative feeder 3 and the traveling speed of the conveyor belt 6. it can.

In the above-described embodiment, the powder has been described as the fluid substance, but the present invention is not limited to this and can be applied to a chemical solution or a liquid fuel.
Moreover, although the said embodiment demonstrated the example which used the conveyance belt conveyor which drive | works linearly as a conveyance means, this invention is not limited to this, It can apply also to the measurement disk which a table feeder rotates.

The conceptual diagram which showed the measuring device of the fluid substance by this invention (A) Plan view showing the weighing cell (b) Cross section taken along line BB Front view showing the weighing cell Cross section showing the weighing cell Side view showing multiple load cells placed side by side in contact with each other Plan view showing multiple weighing cells on a conveyor belt Side view

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Quantity supply machine 2 Supply duct 3 Weighing conveyor 6 Conveying belt 8 Weighing cell 11 Pocket

Claims (7)

A plurality of measuring cells were traversed from the side of the flow of fluids such as powders and liquids to be weighed, and the volume of fluids supplied in the pockets of the metering cells per unit time was measured. A method for measuring a fluid substance characterized by A supply pipe for continuously supplying a fluid substance to be weighed, a conveying means disposed immediately below the supply pipe and having a substantially horizontal conveying surface, and a plurality of juxtaposed in contact with each other on the conveying means A measuring device for fluid substances consisting of a measuring cell. 2. The fluid substance measuring device according to claim 1, wherein the conveying means is a linear conveying conveyor. 2. The fluid substance measuring device according to claim 1, wherein the conveying means is a measuring disk rotating in a horizontal plane. A measuring cell for a fluid substance, characterized in that a bottom surface of a pocket having an open top is formed of a curved surface, and both side edges of the opening are formed in a knife edge shape. 6. The flow material measuring cell according to claim 5, wherein the measuring cell is made of a conductive material. 6. The flow material measuring cell according to claim 5, wherein the measuring cell is made of nylon resin.

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