JP2584368Y2 - Powder guide chute for powder flow meter - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a granular material guide chute of a granular material flowmeter used for measuring a flow rate while being interposed in a pipe for transporting a granular material.

[0002]

2. Description of the Related Art A powder chute is caused to collide with a vertical impact plate via a guide chute for guiding the flow of a powder diagonally downward, and the horizontal component force of the impact load generated at that time is measured by a force sensor such as a load cell and the like. A flow meter for measuring a flow rate is disclosed in, for example, Japanese Patent Application Laid-Open No. 57-189013.

In the measurement by this method, when measuring the flow rate of a relatively small flow rate of the granular material, it is necessary that the collision speed against the impact plate is stable for each flow rate. The impact velocity is determined by the shape of the powder flow in the inclined flow path of the powder guide chute, the shape of the powder flow from leaving the inclined flow path to reaching the vertical impact plate, and after leaving the inclined flow path. It is affected by the distance to reach the vertical impact plate.

[0004]

[Problem to be Solved by the Invention] In order to reduce the size of the powder flow meter and enable the measurement of minute amounts, and to ensure the stable flow of the powder at the time of collision with the impact plate. In this case, the gap between the tip of the guide chute having the inclined flow path and the impact plate should be as close as possible. When the amount of powder is very small, it is desirable to keep the distance to the impact plate as short as possible because the horizontal speed tends to drop because of air. It is desirable.

However, in the conventional inclined chute of the guide chute, since the bottom is flat, the powder particles are dispersed and flow without being gathered, the flow velocity is not stable, and the inclined chute is separated from the inclined chute. Later, the horizontal speed tends to decrease due to air resistance,
As a result, the horizontal speed at the time of collision is not stable, the measured value of the flow rate becomes unstable, and a wrong measured value is output.

The present invention has been made in view of the above points. Even when a relatively small flow rate of a granular material is measured, the collision speed against the impact plate is stabilized for each flow rate value. It is an object of the present invention to provide a powdery and granular material guiding chute of a powdery and granular material flowmeter that can obtain a stable measurement value.

[0007]

In order to solve the above problems, the present invention measures the flow rate of a granular material by measuring the horizontal component of an impact load generated when the granular material hits an impact plate. In the granular material guiding chute of the granular material flow meter, a falling inclined flow path of the granular material having a V-shaped bottom shape is provided.
It is characterized in that the inclined flow path has a bellows-like portion at the tip .

[0008]

The particles accumulate at the bottom of the inclined chute of the guide chute to form one stable continuous flow, and the flow velocity is stabilized at a large value when leaving the inclined chute, and after leaving the inclined chute. Also, the horizontal speed is hardly reduced, and the collision speed against the impact plate is stabilized at a large value, so that the measured value of the flow rate is stabilized.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments.

FIG. 1 is a sectional view of a powder flow meter of the present invention.

The guide chute 1 of the powder flow meter of the present invention is installed in the middle of a powder transport tube (not shown). That is, the guide chute 1 is connected to the upper transfer pipe. The guide chute 1 has a hollow conical shape having a large-diameter inlet 2 and an overflow opening 7 which is a small-diameter outlet, and has an inclined flow path through which powder and granules flow inside. The tip of the guide chute 1 is a tongue-shaped bellows-like portion 8.

A main body 3 is connected to a lower portion of the guide chute 1. The aforementioned guide chute 1 extends to the inside of the main body 3. A force sensor 6 such as a load cell is fixed to an outer wall of the main body 3. The impact plate 4 connected to the force sensor 6 by the connecting portion 5 is provided vertically inside the main body 3 so as not to contact the wall of the main body 3. Further, a certain gap is provided between the tip of the bellows-like portion 8 of the guide chute 1 and the impact plate 4. The lower end of the main body 3 is connected to the lower transport pipe.

A portion near the tip of the guide chute 1 is an opening 7 for overflowing a powdery material whose both sides are notched and whose mouth is wide open, and a central bottom portion is a bellows-like portion 8.

The powder flow meter constructed as described above operates as follows.

The granular material flows into the guide chute 1 from the upper conveying pipe in the direction of arrow A, slides down the guide chute 1 and collides with the impact plate 4 in the direction of arrow B from the bellows-like portion 8.

When the flow rate of the granular material flowing through the bellows-like portion 8 is small, it gathers at the center of the bottom of the bellows-like portion 8 and flows down.
The impact plate 4 collides well. When the flow rate is medium, a part of the powder particles overflows from the bellows portion 8 and falls, but the horizontal speed does not decrease due to the air. Further, when the flow rate is large, the measured value of the powder flow meter becomes suspicious, but overflows to the side and falls.

The impact plate 4 receives a horizontal component force of the impact load, and transmits this from the connecting portion 5 to the force sensor 6. The horizontal component is converted into an electric signal by the force sensor 6 and is displayed as a flow rate of the granular material. The granular material then falls and flows into the lower transport pipe in the direction of arrow C.

When the granular material generates an irregular flow or a large amount of flow, the granular material tends to clog in the gap between the tip of the guide 1a and the impact plate 4. Overflows from the overflow opening 7 and falls into the lower transport pipe. Since the bellows-like portion 8 is thin, the granular material easily falls along the side portion, and therefore, the rate of stagnation or blockage of the flow of the granular material is small. FIGS. 2A and 2B show the guide chute according to the present invention.
1 is a cross-sectional view of the embodiment of FIG.
FIG. In any of these embodiments
The guide chute has a tubular shape. The one shown in FIG.
The surface is a square cylindrical shape, and the one shown in FIG.
Is a fan-shaped cylinder. In any of the examples,
The body 9 has a small V-shaped cross section of the inclined channel of the guide chute 1.
The effect of flowing into a stable continuous flow concentrated on the bottom of the mold
is there. In FIG. 2B, two V-shaped bottom portions are arranged in parallel.
You.

[0019]

[Effect of the Invention] By installing the powder / granule guide chute of the present invention on the impact plate type powder / granule flow meter, when measuring the flow rate of a relatively small flow of the powder / granule, the powder / granular material is not guided by the guide chute. The flow gathers at the V-shaped or U-shaped bottom of the inclined flow path, and further gathers from the time when the granular material leaves the inclined flow path of the guide chute until it reaches the impact plate to form one continuous flow. Then, the velocity of collision with the impact plate is stabilized at a large value for each flow rate value, and as a result, the measurement value of the flow meter is stabilized.

[Brief description of the drawings]

FIG. 1 is a sectional view of a powder flow meter provided with a powder guide chute according to the present invention.

FIG. 2 is a cross-sectional view of the powder flow meter of the present invention, which is perpendicular to the axis of the powder guide chute. .

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Granular material guide chute 3 Main body 4 Impact plate 5 Connecting part 6 Sensor 7 Overflow opening 8 Bellows-like part 9 Granular material

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B65B 39/00 B65B 1/32

Claims (1)

(57) [Scope of request for utility model registration] 1. A granular material guide chute of granular material flow meter for measuring the flow rate of the powder and granular material by granular material is measured or horizontal component of the impact load generated when hitting the impact plate, V shaped bottom shape a falling Ru inclined channel of the particulate material <br/> Bei example having the powder or granular material guide granule flowmeter characterized by having a bellows-like portion at the tip of the inclined channel shoot.