JPH0519781Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a continuous measuring device for the flow rate of powder and granular materials.
In particular, the present invention relates to a continuous measuring device for measuring the flow rate of powder and granular material, which constantly detects the weight of the powder and granular material as it is fed into and discharged from a rotary feeder.

[Prior Art] In this type of continuous measuring device for the flow rate of powder and granular materials, there has already been a measuring device that measures the flow rate of the powder and granular material from the weight of the powder and granular material fed into the rotary feeder and the rotation speed of the rotary valve. It is publicly known (Japanese Unexamined Patent Publication No. 1983)
-Refer to Publication No. 27619).

According to this prior art, the rotary feeder is rotatably supported by a support mechanism via a horizontal axis, supported so as to maintain balance by a load cell installed in a direction perpendicular to the horizontal axis, and is also provided with a rotary valve. Equipped with a rotation speed detector that detects the rotation speed of the engine. The increase in load due to the introduction of powder and granular material is detected by a load cell, and the powder and granular material flow rate is measured from this and the rotation speed of the rotary valve detected by a rotation speed detector.

[Problems with the prior art] However, in this prior art, the rotary feeder is rotatably supported by a support mechanism via a horizontal shaft.
Because the device has a complicated structure, such as supporting it in a balanced manner with a load cell installed perpendicular to the horizontal axis, it not only makes the device expensive, but also causes problems in that it takes time to maintain and inspect the device. Ta.

As another prior art, Japanese Patent Application Laid-Open No. 56-27619 discloses a flowmeter weighing machine that electrically detects the weight of material using a load cell. but,
This flowmeter heavy equipment is premised on the use of an annular conveyor, so its range of use is limited.

Further, Japanese Patent Application Laid-Open No. 57-28217 discloses a powder supply amount measuring device that includes an arithmetic circuit that calculates the instantaneous supply amount from the product of the rotation speed and the weighed value. However, this weighing device has the problem that it cannot be applied to anything other than screw feeders, and cannot be applied to rotary leaf feeders.

Further, Japanese Patent Application Laid-Open No. 57-22517 discloses a powder flow rate measuring device equipped with a balance weight. However, this device measures the powder while it is stationary, and is not suitable for continuous real-time measurement.

As described above, with conventional technology, it is difficult to continuously measure the flow rate of powder and granular materials with high precision, and even if it were possible, the conditions for installing the measuring device are too strict, resulting in a lack of versatility. did.

[Purpose of the invention] The present invention solves the above-mentioned drawbacks of the conventional rotary feeder type continuous measuring device for powder and granular material flow rate, is mechanically extremely simple, can be manufactured at a relatively low cost, and is easy to maintain and inspect. The purpose of this invention is to provide a device that can continuously measure the flow rate of powder and granular material with high accuracy without taking much time and effort.

[Structure of the invention] The device for continuously measuring the flow rate of powder or granular material of the invention has a rotary feeder equipped with a rotary valve made of a plurality of blades disposed at one end of a base supported on a fulcrum, and the rotary Powder supply piping and discharge piping are connected to the powder inlet and outlet of the feeder via flexible piping etc. in a manner that is weight-insulated from the rotary feeder, and the rotary valve of the rotary feeder is also connected to the powder inlet and outlet of the feeder. A rotation detector is provided to detect the rotation speed of the rotary valve, and a counterweight containing the weight of the motor that rotates the rotary valve is disposed at the other end of the base body, and the weight of the counterweight is Approximately 10% of the weight of powder and granules accumulated in the rotary feeder in a starved state than the weight of Ida
A weight detector is provided between the rotary feeder side of the base body and the stationary member to detect the weight from the deflection of the base body, and a powder/granular material flow rate per unit time is provided. The calculation system is equipped with a calculation system that calculates
A weight signal continuously detected by the weight detector and a rotational speed signal continuously detected by the rotational speed detector are input, and the weight is detected in a state where no powder or granular material has accumulated in the rotary feeder. detection value of the device
The weight ΔW=Wa−Wo of the powder and granular material accumulated in the rotary feeder is determined from Wo and the detected value Wa of the weight detector when the powder and granular material accumulates in the rotary feeder in a starved state. From the weight ΔW of the powder and the rotation speed R of the rotary valve per unit time detected by the rotation speed detector, the flow rate of the powder per unit time F=K×ΔW×R (K>0, usually about 2) It is structured to seek.

Here, as the calculation system, for example, an electrical calculation system is preferable.

When implementing the present invention, it is preferable that the discharge capacity (volume) of the rotary feeder is larger than the volume flow rate of the powder or granular material. In this way, the weight of the powder accumulated in the rotary feeder can be continuously measured.

In this specification, the term "powder and granular material accumulated in the rotary feeder in a starved state" means that the granular material is kept in a state in which the rotary feeder is not filled with the powder and granular material.

[Function] According to the present invention having the above configuration,
The rotary feeder is installed at one end of a base supported on a fulcrum, a count weight is used to maintain the required balance, and the weight is detected by a weight detector based on the deflection of the base. It is structurally simpler than a system in which it is rotatably supported by a support mechanism and supported to maintain balance by a weight detector installed perpendicular to the horizontal axis, and the measurement results are excellent, and the device is inexpensive. In addition to making maintenance and inspection easier.

[Examples] Examples of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, a rotary feeder 1 has a casing 4 equipped with a powder inlet 2 and an outlet 3, and a rotary valve 5 made of a plurality of blades is installed inside the casing 4. It is being This rotary feeder 1 is disposed at one end of a beam 7 which is a base body supported by a bearing 6 which is a fulcrum, and a reducer for rotating a rotary valve 5 is provided at the other end of the beam 7. Counterweight 8 consisting of attached motor 9 and weight 10
is arranged, and the rotary feeder 1 of the beam 7
A weight detector 12 that detects the weight from the deflection of the beam 7 is provided between the side end and the base 11, which is a stationary member. The weight of the counterweight 8 is set to be smaller than the weight of the rotary feeder 1 by about 10 times the weight ΔW of the granular material accumulated in the rotary feeder in a starved state. That is, the beam 7 is initially placed on the weight detector 12 so that a weight approximately 10 times the weight ΔW of the powder and granules accumulated in the rotary feeder 1 in a starved state is applied.
An equilibrium state is maintained. Further, the rotary feeder 1 is provided with a rotation speed detector 13 for detecting the rotation speed of the rotary valve 5, and together with the weight detector 12, an arithmetic device for calculating the flow rate of powder/granular material per unit time, which will be described in detail later. That is, it is connected to the computing system 14. Note that a powder supply pipe and a discharge pipe (not shown) are connected to the inlet 2 and outlet 3 of the rotary feeder 1, but these pipes are flexible in order to insulate the rotary feeder 1 from the weight. It is connected to the inlet 2 and outlet 3 of the rotary feeder 1 via piping.

Next, the operation will be explained. Powder and granular material falls into the rotary feeder 1 from the inlet 2 of the rotary feeder 1. Since the discharge capacity (volume) of the rotary feeder 1 is larger than the volume of the falling powder and granules, the powder and granules accumulate in the rotary feeder 1 in a starved state. The rotary valve 5 is rotated by a motor 9 with a speed reducer, and the powder and granules accumulated in a starved state are moved by the rotary valve 5 and fall from the outlet 3.

Now, the weight received by the weight detector 12 in a state where no powder or granular material has accumulated in the rotary feeder 1 is measured in advance from the deflection of the beam 7, and this weight is designated as Wo.

The weight that the weight detector 12 receives when powder and granules accumulate in the rotary feeder 1 in a starved state is continuously measured from the deflection of the beam 7, and the weight is calculated as Wa
shall be.

The weights Wo and Wa detected by the weight detector 12 are input to the calculation system 14, and the calculation system 14 continuously calculates the weight ΔW of the powder and granular material accumulated in the rotary feeder 1 as ΔW=Wa−Wo. Calculate.

Since the rotary valve 5 of the rotary feeder 1 has a plurality of blades, even if the rotary valve 5 rotates and the powder moves, the rotary feeder 1
The weight ΔW of the powder and granules accumulated inside is proportional to the flow rate of the powder and granules. The weight of this powder is rotary valve 5
1/K of the weight of powder discharged during one rotation of
(Here, K>0 and usually about 2) can be rephrased.

On the other hand, the rotation speed detector 13 continuously detects the rotation speed per unit time of the rotary valve 5, and the rotation speed R is inputted into the calculation system 14. Then, in the calculation system 14, the powder and granule flow rate F per unit time is calculated from the weight ΔW of the powder and the rotation speed R per unit time of the rotary feeder.F=K×ΔW×R (where K>
0, usually approximately 2). By the way, the weight of the counterweight 8 is the same as that of the rotary feeder 1.
Since the weight is set to be approximately 10 times smaller than the weight ΔW of the powder and granular material accumulated in the rotary feeder 1 in a starved state, therefore, Wo≒10ΔW, and ΔW
The ratio of this to Wo is approximately 1/10. As a result, the measurement accuracy is extremely high.

FIG. 3 shows another embodiment of the invention, in which the weight detectors 12, 12 are connected to the beam 6 and the machine frame 1, which is a stationary member.
This is an example in which the rotary feeder 1 is provided between the rotary feeder 5 and the rotary feeder 1, and the other components are configured in the same manner as in FIG.
This embodiment also has the same effects as in FIG. 2.

FIG. 4 is a perspective view of another apparatus for continuously measuring the flow rate of powder or granular material according to the present invention.
The edge of the base 7 on the opposite side and the frame 1 which is a fixed member
This is an example in which it is arranged almost horizontally between the two. Other points are substantially the same as in each of the above embodiments.

[Effects of the invention] The effects of the invention described above are listed below.

(1) The rotary feeder is placed on one end of the base supported on a fulcrum, and a counterweight is placed on the other end of the base to maintain a predetermined balance between the rotary feeder side of the base and the immovable member. Since a weight detector is provided in between, it is possible to measure the flow rate of powder and granular material with a simpler structure and higher accuracy than conventional devices.

(2) Applicable to rotary feeders.

(3) From the weight of the powder and the rotation speed R of the rotary valve per unit time, the flow rate of the powder and granule per unit time is quickly and accurately calculated in real time.

(4) The weight of the counterweight is set to be approximately 10 times smaller than the weight of the rotary feeder, and the weight of the powder accumulated in the rotary feeder in a starved state is set to be smaller than the weight of the rotary feeder. Since the ratio of the weight of the granules to the weight of the counterweight was approximately 1/10, the measurement accuracy was extremely high.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a rotary feeder used in the present invention, and FIGS. 2, 3, and 4 are overall configuration diagrams showing the first, second, and third embodiments of the present invention, respectively. It is. 1...Rotary feeder, 2...Powder inlet,
3... Powder outlet, 5... Rotary valve, 6...
... Bearing, 7 ... Base, 8 ... Counterweight, 9 ... Motor, 10 ... Weight, 11 ...
... Base, 12 ... Weight detector, 13 ... Rotation speed detector, 14 ... Electric calculation system, 15 ...
Machine frame.

Claims (1)

[Scope of utility model registration request] A rotary feeder equipped with a rotary valve consisting of a plurality of blades is disposed at one end of a base supported on a fulcrum, and the powder inlet and outlet of the rotary feeder are connected via flexible piping, etc. The powder supply pipe and the discharge pipe are connected to the rotary feeder in a weight-insulated manner, and a rotation detector is provided to detect the rotation speed of the rotary valve of the rotary feeder. A counterweight that includes the weight of the motor that rotates the rotary valve is disposed at the other end, and the weight of the counterweight is greater than the weight of the rotary feeder due to the amount of powder and granules accumulated in the rotary feeder in a starved state. The structure is approximately 10 times smaller than the weight, and a weight detector is installed between the rotary feeder side of the base and the stationary member to detect the weight from the deflection of the base. The calculation system is equipped with a calculation system for determining the flow rate of powder and granular material, and the calculation system receives the weight signal continuously detected by the weight detector and the rotation speed signal continuously detected by the rotation speed detector, and From the detection value Wo of the weight detector when no powder or granules accumulate in the feeder and the detection value Wa of the weight detector when powder or granules accumulate in the rotary feeder in a starved state. The weight ΔW = Wa − Wo of the powder and granular material accumulated in the rotary feeder is calculated, and the unit time is calculated from the weight ΔW of the powder and granular material and the rotation speed R per unit time of the rotary valve detected by the rotation speed detector. A device for continuously measuring the flow rate of powder or granular material, characterized in that it is configured to determine the per unit flow rate of powder or granular material F=K×ΔW×R (K>0, usually about 2).