JP2003035651A - Equipment and method for measuring particle size - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure the size of a particle simply. SOLUTION: The equipment 1 for measuring the size of a particle 4 comprises an oscillatory member 11 against which the particle 4 collides, and a unit 12 for measuring oscillation of the oscillatory member 11. Oscillation of the oscillatory member 11 being generated when the particle 4 collides against it is measured by the oscillation measuring unit 12 and the size of the particle 4 is measured from the distribution of oscillation.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to measurement of particle size of particles such as crushed stone.

[0002]

2. Description of the Related Art Conventionally, the particle size of particles such as rock has been measured by passing a plurality of screens (sieves) having different mesh sizes depending on whether the particles can pass through. Therefore, it took a lot of time to measure the particle size. Also, a large number of particles are photographed and the particle size of each particle is measured by image processing. However, the fine particles are hidden behind other particles, and the accurate particle size cannot be measured.

[0003]

<A> The present invention is to easily measure the particle size of particles. <B> Further, the present invention is to measure the particle size of particles with a simple apparatus.

[0004]

SUMMARY OF THE INVENTION The present invention provides a particle size measuring device for measuring the particle size of particles, which comprises a collision vibrating material with which the particles collide, and a vibration measuring device for measuring vibration of the collision vibrating material. The vibration of the collision vibrating material generated when colliding with the collision vibrating material is measured by a vibration measuring device, characterized by measuring the particle size of the particles from the vibration distribution, the particle size measuring device, or in the particle size measuring device, The impact vibration material is linear,
Characterized in that it is rod-shaped or plate-shaped, the particle size measuring device, or, in the particle size measuring device, characterized by comprising a resonator that resonates with the vibration of the collision vibration material, the particle size measuring device, or particles In the particle size measuring method for measuring the particle size of, the collision vibration material is arranged in the area where the particles pass, the vibration of the collision vibration material generated when the particles collide with the collision vibration material is measured, and the particle size of the particle is determined from the vibration distribution. In the particle size measuring method, or in the particle size measuring method for measuring the particle size of particles, there are a plurality of regions through which particles having the same particle size pass, and collision vibration is generated so as to sequentially pass through each region. In the particle size measuring method, the material is moved, the vibration of the collision vibrating material generated when the particles collide with the collision vibrating material is measured, and the particle size of the particles in each region is measured from the vibration distribution. .

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

<A> Particle Size Measuring Device The particle size measuring device 1 measures the particle size from the vibration distribution of the collision vibrating member 11 generated when the particles 4 collide with the collision vibrating member 11, as shown in FIG. Further, a collision vibration member 11 on which particles collide and a vibration measuring device 12 for measuring the vibration thereof are provided. The particle size measuring device 12 has a correlation between the particle size of the particles 4 and the vibration distribution of the collision vibrating material 11 when the particles 4 collide, and finds the particle size in reverse from this correlation. Note that the particles 4 are not limited to spherical shapes, but are particles having an arbitrary shape. Taking earth and wood as an example,
There are aggregates, sand, and crushed rock. Further, the particle size represents the degree of the size of the particle, and the large particle size means that the particle diameter is large, for example.

<B> Colliding Vibration Material The collision vibration material 11 may be any material that vibrates when the particles 4 collide. The collision vibrating material 11 has a linear shape, a rod shape, a plate shape,
Or, three-dimensional shape (including polyhedral shape or spherical shape, those with or without space inside, those with or without partitions in the space, and those without part of the surface of the solid) are used. it can. The particle size of the particles 4 can be measured over a wide range by moving the collision vibrating material 11 in a passage area of the particles 4, for example, a falling area.

<C> Vibration Measuring Device The vibration measuring device 12 measures the vibration of the collision vibration member 11, and there are various types. For example, the vibration measuring device 11 may be one that directly measures the vibration of the collision vibration material 11 or one that measures the vibration of the resonance body by attaching a resonator to the collision vibration material. The vibration detecting means 14 may be any as long as it can detect the vibration of the collision vibrating material 11 and the resonator 13, and includes a microphone that converts sound into an electric signal, a piezoelectric element that converts pressure change due to vibration into an electric signal, and the like. The vibration distribution of the collision vibration member 11 can be obtained by the vibration processing device 15 from the detected electric signal. The vibration processing device 15 uses, for example, a fast Fourier transform (FFT) device, or uses a bandpass filter, an arithmetic processing device, or the like to divide the vibration of the detected electric signal into a plurality of vibration distributions. You can ask.

<D> Vibration distribution of collision vibration material There is a correlation between the particle size of the particles 4 and the vibration distribution of the collision vibration material 11, and an example thereof is shown in FIG. FIG. 2 is a graph of particles having different particle sizes measured by the same particle size measuring device 1. FIG. 2A shows a rock particle size of 0.3 mm to 1.2 mm.
The vibration distribution generated when the mm particles collide with the collision vibrating material is shown. FIG. 2B shows a particle size of 1.2 mm to 3 m.
2C is a vibration distribution in a particle of m, and FIG. 2C is a vibration distribution in a particle having a particle size of 3 mm to 5 mm.

In FIG. 2, the horizontal axis is the logarithmic scale and the frequency (Hz).
The vertical axis indicates the power spectrum (dBV).
(1 scale: 8 dBV) is shown. The vibration intensity at the standard frequency (reference point) is stronger as the grain size is larger. In FIGS. 2A to 2C, the strength at a specific frequency (reference point) differs depending on the particle size, and the larger the particle size, the stronger the strength. This reference point may be determined depending on the measurement target. In FIG. 2, when the frequency increases, the frequency near the point where the intensity change begins to be taken as the reference point.

As the frequency further increases, depending on the grain size,
The rate of change in intensity (vibration pattern) begins to differ. Therefore, it is possible to specify the granularity by selecting a frequency having a large difference in intensity change with respect to the difference in granularity, setting the frequency as a comparison frequency, and examining the intensity difference between the comparison frequencies.

At the first comparison frequency in FIG. 2, grain size 0.
At 3 mm to 1.2 mm, there is a difference of 8 dBV from the reference point (Fig. 2 (A)), but at grain sizes of 1.2 mm to 3 mm, there is a difference of 15 dBV from the reference point (Fig. 2 (A)).
(B)), with a grain size of 3 mm to 5 mm, 2 with respect to the reference point
There is a difference of 6 dBV (Fig. 2 (C)). In the second comparison frequency, when the grain size is 0.3 mm to 1.2 mm, there is a difference of 3 dBV from the reference point, but the grain size is 1.2 mm.
There is a difference of 15 dBV from the reference point at ~ 3 mm, and 33 dB from the reference point at grain sizes of 3 mm to 5 mm.
There is a difference in V. Further, at the third comparison frequency, when the grain size is 0.3 mm to 1.2 mm, 8 dBV with respect to the reference point.
However, in the particle size of 1.2 mm to 3 mm, there is a difference of 25 dBV from the reference point, and the particle size of 3 mm to 5 mm.
Then, there is a difference of 42 dBV from the reference point. As described above, there is a pattern of frequency distribution corresponding to each grain size, and the grain size can be measured by utilizing the difference in this pattern.

An example of using the particle size measuring device in the particle size adjusting device will be described below.

<B> Granularity Adjusting Device The granularity adjusting device 2 is, for example, as shown in FIG.
0 and the dividing section 3 are provided, and a large number of particles 4 having different particle sizes are adjusted according to the same particle size. A large number of particles having different particle sizes are charged from a particle charging unit 41 such as a hopper to the vibration conveyance unit 20, vibrated while being deposited, separated into multiple layers, transferred, and roughly divided into containers 42 in the dividing unit 3 and adjusted.

The collision vibrating material 11 is arranged at the particle dropping position of the particle size adjusting device 2. By measuring the frequency of the collision vibrating material 11, the particle size of the particles colliding with the collision vibrating material can be obtained. The adjustment is roughly divided into particles having the same particle size, that is, a group of particles having a particle size of a certain width.

<B> Vibrating and Conveying Section The vibrating and conveying section 20 may be one that vibrates and conveys particles, and is a means for vibrating by depositing a large number of particles having different particle sizes on the upper part. As a result, the particles having a small particle size gradually move to the lower layer, the particles having a large particle size move to the upper layer, the particles having the same particle size are distributed so as to form the same layer, and the particles are separated into multiple layers for each particle size. The vibration conveyance unit 20 conveys the multi-layered particles simultaneously with or after the application of vibration. The term "multilayer" as used herein means that the boundaries between the layers are not clearly separated, but the particle size is distributed such that the particle size increases from the lower layer to the upper layer.

The vibrating and conveying section 20 includes, for example, a vibrating device 21.
A conveyor belt of a belt conveyor equipped with can be used. The vibrating device 21 moves the conveyor belt in, for example, the vertical direction, or
By vibrating in an oblique direction or the like, the particles accumulated on the conveyor belt can be vibrated, and the accumulated particles can be separated into multiple layers and conveyed.

<C> Dividing part The dividing part 3 is a part of the particles laminated in multiple layers on the vibrating and conveying part.
It is divided into multiple groups. For example, the dividing unit 3
Is a method of dropping particles so as to separate each layer of a multilayer so that particles located in an upper layer fall far and particles located in a lower layer fall close to each other.

<D> Dropping means The dropping means of the dividing unit 3 drops the particles located in the upper layer to a distance and the particles located in the lower layer to a close distance. For example, as shown in FIG. A rotating part can be used. By rotating the conveyor belt by a rotating device 31 such as a motor, among particles accumulated in multiple layers on the conveyor belt, particles in the upper layer have a large distance (rotation radius) from the rotation axis 32. The particles in the lower layer have a small radius of gyration and thus fall to a location near the axis of rotation.

<E> Particle size measurement The collision vibration material 11 is movably arranged in the particle falling area. The collision vibration material 11 is moved in a range from a small particle size region to a large particle size region, and the particle size of each particle is measured. Thereby, the particle size of the particles passing through each region can be measured by one particle size measuring device, and the particle size of the particles contained in the container 42 can be known.

[0021]

According to the present invention, the following effects can be obtained. <A> In the present invention, the particle size of particles can be easily measured. <B> Further, in the present invention, the particle size of particles can be measured with a simple device.

[Brief description of drawings]

[Figure 1] Measurement principle diagram of particle size analyzer

FIG. 2 is a diagram showing the relationship between the vibration distribution of a collision vibration member and the particle size of particles.

FIG. 3 is a diagram showing an application example of a particle size measuring device.

[Explanation of symbols] 1. Particle size measuring device 11..Collision vibration material 12 ... Vibration measuring device 13 ... Resonator ..Vibration detection device 15 ... Vibration processing device 2 Particle size adjuster 20 ... Vibration transfer unit 21..Vibration device 3 ... Dividing part 31..Rotation device 32 ... Rotating shaft 33 .. Partition plates 4 ... particles 41..Particle input unit 42..container

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yuichi Nagahara             1-2-2 Hiroshiradake, Kure City, Hiroshima Prefecture             Ki Giken Co., Ltd. F-term (reference) 2G047 AA01 BA04 BC00 BC04 CA03                       EA09 GG12 GG17

Claims (5)

[Claims] 1. A particle size measuring device for measuring the particle size of particles, comprising: a collision vibrating material with which particles collide; and a vibration measuring device for measuring vibration of the collision vibrating material, wherein when the particles collide with the collision vibrating material. A particle size measuring device characterized in that the vibration of a collision vibrating material generated is measured by a vibration measuring device and the particle size of the particles is measured from the vibration distribution. 2. The particle size measuring apparatus according to claim 1, wherein the collision vibration material has a linear shape, a rod shape, or a plate shape. 3. The particle size measuring apparatus according to claim 1, further comprising a resonator that resonates with the vibration of the collision vibration material. 4. A particle size measuring method for measuring the particle size of particles, wherein a collision vibrating material is arranged in a region through which the particles pass, and the vibration of the collision vibrating material generated when the particles collide with the collision vibrating material is measured, A particle size measuring method characterized by measuring the particle size of a particle from a vibration distribution. 5. A particle size measuring method for measuring the particle size of particles, wherein there are a plurality of regions through which particles having similar particle sizes pass,
By moving the collision vibrating material so that it passes through each area in sequence, measure the vibration of the collision vibrating material generated when the particles collide with the collision vibrating material, and measure the particle size of the particles in each area from the vibration distribution. Characteristic, particle size measurement method.