JPS5886415A - Continuous detector for flow rate of powder fluid - Google Patents

Abstract

PURPOSE:To display flow rate with slight errors continuously and to integrate the flow rate by detecting the quantitative change in the kinetic energy of fluid in the bend part in the mid-way of a transport pipe as the tension or pressing force exerted upon a load cell. CONSTITUTION:The rectilinearly advancing pressure air fed to this device is compelled to change direction in the part of a bend 1, and tends to displace the bend 1 forcibly outward with a fulcrum axis 8 of the bend as an axis. However, the bend is connected at the front and rear to flexible pipes 4, 5 on the upper and down stream sides; therefore the down stream side of the bend 1 tries to escape to an outer arc side. In accordance with said movement, a suspension fulcrum 9 tends to detach from a load cell 10 and tensile force acts upon the inside of the cell 10, thus generating a strain in the detecting part thereof. When materials to be transported are contained in the pressure air, the intensity of the force pressing the bend to the outer arc side differs from that in the case of the flow of only the pressure air and therefore the magnitude of the tensile force is operated with an electronic device. Then the momentary rate of transportation and the integrated value of flow rate are displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a powder/granular material flow rate integration device that continuously measures the flow rate of powder/granular material in the middle of a transport pipe for pneumatic transportation of powder/granular material, and integrates and displays this. be.

Conventionally, this type of flow rate detection device is often a patch type that measures discontinuously, and continuous measurement in the middle of a transport pipe has many errors due to changes in airflow speed and other conditions during measurement, which prevents it from being put into practical use. is the current situation.

The present invention suspends a bend part in the middle of the transport pipe in a free state to continuously measure the flow rate in the middle of the transport pipe, and measures the quantitative change in the kinetic energy of the direction change of the fluid at the bend part, which is applied to a load cell. It detects tension or pressing force, continuously displays the flow rate with a slight error, and also integrates the flow rate.

Next, an embodiment of the present invention will be described with reference to an explanatory side view of FIG.

The bend 1 is connected to the upstream transport pipe 2 and the downstream transport pipe 8 by an upstream flexible pipe 4 and a downstream flexible pipe 5, respectively, and forms part of a transport system.

Further, the bend 1 is supported by a bend support shaft 8 fixed to the base plate 12 on the upstream side, and vertical movement of this portion is suppressed and only rocking in the axial direction is allowed.

A bracket is provided on the bend 1 in a direction facing the downstream flexible tube 5, one end is fixed to the bracket, the other end is fixed to the substrate 12, and a balancing flexible tube 6 is attached on the same axis as the downstream flexible tube 5. is provided, and the balancing flexible tube 6 and the downstream flexible tube 5 are in pressure communication with each other through a pressure balancing tube 7 made of a rubber hose or the like.

The load cell A/10 is thus supported by the bend fulcrum 8 and is located near the downstream flexible pipe on the inner arc side of the bend 1, which is in a substantially free state in the direction of the transport pipe flow path, as the suspension fulcrum 9, On the other hand, it is provided between a suspension fulcrum 1111 fixed to the substrate 12. Although not shown, Lordse/L/
10 is electrically connected to an amplifier for supplying power and amplifying the signal from the load cell, an analog/digital converter, and subsequently a microcomputer and the like.

The continuous flow rate integration device of the present invention configured as described above operates as follows.

In other words, when pressurized air for transportation is sent to the part of this continuous flow rate integrating device installed in the air transport pipe system, the pressurized air traveling straight is forced to change direction at the vent '1 part, and the kinetic energy is lost due to inertia. A centrifugal force acts on the outer arc of the bend 1 and acts as a force to push the bend 1 outward around the bend support shaft 8.
is connected to the upper and downstream flexible pipes 4.5 at the front and back, so the downstream side of bend 1 tries to escape to the outer arc side, and the suspension fulcrum A9 is connected to the load cell/tube fixed to the board.
1/10, a tensile force acts inside the load cell IO, causing distortion in its detection part.The magnitude of the tensile force is guided by the aforementioned electronic device connected to the load cell IO, and the flow rate is It is displayed as a change.

Here, the flexible pipes 4.5 on the upstream and downstream sides connected to the bend 1 are
The tube itself tries to stretch, but there is no problem because the upstream flexible tube 4 is restrained from stretching by the bend support shaft, but the downstream flexible tube 5 can expand and contract freely, so the sensitivity of the load cell 10 may be affected by the error. It could become something big.

Therefore, in this device, on the axis opposite to the downstream flexible pipe 5, a
A flexible balancing tube 6 having specifications is provided, and both are connected by a pressure balancing tube 7 to balance the pressure with the downstream flexible μ tube 5, so that the aforementioned downstream flexible tube 5 does not expand due to pressure. This prevents measurement errors from occurring due to pressure fluctuations.

When the scale of the measuring device is set to zero when only pressurized air for transportation is used, and then the object to be transported is allowed to flow, the scale of the measuring device records a waveform as shown in FIG.

The graph in FIG. 2 is a reproduction of the record of a measurement experiment, and is an example in which the objects to be transported were fed from a rotary feeder rotating at 18 revolutions per minute.

In other words, the object to be transported is mixed with pressurized air and transported,
When passing through this bend, the mass is different from when only pressurized air flows, so if the transported object passes through the bend l.
The difference is the strength of the force that pushes the curve toward the outer arc.

The pulsation of the line representing the amount of transportation in the graph accurately represents the pulsation of the amount supplied from the rotary feeder, and the dots represent the amount of transportation.If this data is converted into digital data and calculated using a microcomputer, it will be possible to As mentioned in 2.2, the amount of transportation is displayed every moment, and the integrated value of the flow rate can also be displayed.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is an explanatory side view showing one embodiment of the present invention.
FIG. 2 is a reproduction diagram of a flow rate waveform showing experimental values. l...Bend. 2... Upstream transport pipe. 3...Downstream transport pipe. 4... Upstream flexible pipe. 5-sancho flow side flexible pipe. 6...Flexible tube for balance. 7.
...Pressure balance tube. 8...Bend spindle. 9... Hanging fulcrum A. 10...Load cell. 11... Hanging fulcrum B012.
··substrate. Patent application Hitosanko Air Equipment Co., Ltd. CEO Yu Tsune Moriyama Figure 2

Claims (1)

[Claims] At a bent part in the middle of a transport pipe in pneumatic transportation of powder and granular materials, the upper and downstream side of the bend is connected to the transport pipe with a flexible pipe, and a bracket is fixed to the substrate close to the flexible pipe on the upstream side of the bend. The upstream side of the bend is supported by a bend support shaft, and a balancing flexible tube having substantially the same shape as the downstream flexible tube is placed at an opposing position on the axis of the downstream flexible tube, with one end bent and the other end fixed to the substrate. Further, the downstream flexible pipe and the balancing flexible pipe are connected by a pressure balancing pipe, and one fulcrum is located at a portion close to the downstream flexible pipe on the inner arc side of the bend, and the other is connected by a pressure balancing pipe. 1. A continuous flow rate detection device for powder and granular material, characterized in that the flow rate of a transported object passing through the bend portion is continuously detected by a load cell μ fixed to a substrate.