WO2008032363A1

WO2008032363A1 - Method of measuring grain size and apparatus for measuring grain size

Info

Publication number: WO2008032363A1
Application number: PCT/JP2006/318036
Authority: WO
Inventors: Takato Kaya; Ken Shimazutsu
Original assignee: Kotobuki Engineering & Manufacturing Co., Ltd.
Priority date: 2006-09-12
Filing date: 2006-09-12
Publication date: 2008-03-20

Abstract

A method of measuring grain size and an apparatus for measuring grain size whereby the grain size distribution of a granular material can be accurately measured in real time using a simple means. This apparatus comprises a vibration exciter (30) which forcedly vibrates a grain-mass mixture (A) to thereby divide the grain-mass mixture (A) and a measurement unit (40) whereby the surface layer roughness and the inner face roughness of the grain-mass mixture (A) having been divided by the vibration are measured for each grain size. The measurement unit (40) has a sensor (41) which is located toward the grain-mass mixture (A) having been divided by the vibration and a level rod (42) which is located in such a manner as allowing insertion thereof into the grain-mass mixture (A) having been divided by the vibration.

Description

Specification

Particle size measuring method and particle size measuring device

Technical field

TECHNICAL FIELD [0001] The present invention relates to a particle size measurement technique for aggregates of sand, rocks, minerals, etc., wastes such as concrete galley, or agglomerates of various diameters of granular materials, and more particularly agglomerates. The present invention relates to a particle size measuring method and a particle size measuring device capable of accurately measuring the particle size distribution of a mixture in real time.

Background art

[0002] Conventionally, the following methods are known as methods for measuring the particle size distribution of aggregates.

(1) A method of dividing and sorting using multiple types of screens with different meshes!

(2) A method of using a laser beam to scatter light in the light to refract the light and measure the particle size distribution from the degree of refraction (Patent Document 1).

(3) Measurement using a CCD camera (Patent Document 2).

Patent Document 1: Japanese Patent Laid-Open No. 6-109615

Patent Document 2: JP-A-6-213796

Disclosure of the invention

Problems to be solved by the invention

[0004] The conventional particle size measurement technique for the above-mentioned agglomerate mixture has the following problems.

(1) Currently, the most commonly used method is the `` Furu '', the separation method, and because it relies on manual labor, it requires about a lot of people to measure and it takes about to complete the counting work. It takes a long time of half a day and it is impossible to measure the particle size distribution in real time. In addition, since the sieve is clogged once used, there is a drawback that the sieve must be cleaned after each measurement.

(2) With the measurement method using laser light, precise measurement can be performed for extremely small sand, but it is possible to measure with a particle size large enough to completely block the laser light. There are disadvantages. (3) In the case of a method using a CCD camera, it is suitable for measuring a very small particle size distribution as well as being expensive, but suitable for measuring a large amount of sand or gravel with a narrow field of measurement. ! /, And! / Have some difficulties.

[0005] The present invention has been made in view of the above points, and an object of the present invention is to accurately measure the particle size distribution of the agglomerate mixture in real time with a simple means. An object of the present invention is to provide a particle size measuring method and a particle size measuring apparatus capable of performing the same.

A further object of the present invention is to provide a particle size measuring method and a particle size measuring device capable of controlling the particle size mixture production apparatus by measuring the particle size distribution of the particle mixture in real time.

Means for solving the problem

[0006] The first invention of the present application is a particle size measurement method for measuring the particle size from the surface layer to the inside of the agglomerate mixture, forcibly applying vibration to the agglomerate mixture, and dividing the agglomerate mixture according to particle size. The surface roughness of the separated and vibrationally separated agglomerate mixture and the surface of the agglomerate mixture are removed by the surface of the agglomerated mixture and the surface roughness of the exposed layer is measured with a sensor. Provided is a particle size measuring method characterized in that the particle size distribution of the agglomerate mixture is obtained by calculation based on the measured values of the surface roughness in the range from the surface layer to the inside of the agglomerate mixture.

As a form of measuring the surface roughness of the agglomerate mixture separated by vibration with the sensor, the force measured by directing force from the surface layer of the agglomerate mixture or the internal force of the agglomerate mixture is also measured toward the surface layer.

According to a second invention of the present application, in the first invention, the particle mixture separated by vibration by moving either one or both of the agglomerate mixture or the sensor and the exposure device for the agglomerate mixture is moved. Provided is a particle size measuring method characterized by exposing the inside of a lump mixture.

A third invention of the present application is a particle size measuring device for measuring the particle size from the surface layer to the inside of the agglomerate mixture, and a vibration device for forcibly applying vibration to the agglomerate mixture to vibrate and separate the agglomerate mixture; A measuring device for measuring the surface roughness of the agglomerate mixture separated by vibration for each particle size, the measuring device comprising a sensor arranged toward the separated agglomerate mixture, and vibration separation An exposure means for removing the agglomerated mixture and exposing the inside thereof, and a central processing unit for calculating the particle size distribution of the agglomerate mixture based on the measured surface roughness by the sensor, the agglomerate mixture, Alternatively, either one or both of the sensor and exposure means that compose the measuring device are moved, and the measured value of the surface roughness in the range from the surface layer to the inside of the vibrationally separated agglomerate mixture is calculated by the central processing unit. Thus, a particle size measuring device is provided, wherein the particle size distribution of the agglomerate mixture is determined.

A fourth invention of the present application is the sensor according to the third invention, comprising a conveying means for continuously conveying the agglomerate mixture, and constituting a measuring device toward the conveying means equipped with a vibration device. A particle size measuring device is provided.

A fifth invention of the present application provides the particle size measuring apparatus according to the fourth invention, wherein the means for conveying the agglomerate mixture is a belt type conveyor.

A sixth invention of the present application provides the particle size measuring device according to the third invention, wherein the sensor and the exposure means constituting the measuring device are arranged so as to be movable along the agglomerate mixture.

According to a seventh invention of the present application, in the third invention, an elevating means is provided in the agglomerate mixture exposing means integrated with the sensor, and the sensor can be moved up and down in synchronization with the agglomerate mixture exposing means by the elevating means. Providing a particle size measuring device characterized in that

The invention's effect

[0007] The present invention can provide a particle size measuring method and a particle size measuring device capable of accurately measuring the particle size distribution of the agglomerate mixture in real time with simple means. Furthermore, the present invention can provide a particle size measuring method and a particle size measuring device capable of controlling the particle size mixture production apparatus by measuring the particle size distribution of the particle mixture in real time.

In addition, the present invention can measure the particle size of various types of agglomerate mixtures, and is versatile.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment according to the present invention will be described with reference to the drawings. [0009] (1) Outline of particle size measuring device

FIG. 1 shows a model diagram of a particle size measuring apparatus according to an embodiment of the present invention.

The particle size measuring apparatus according to the present invention includes a hopper 10 containing a dried agglomerate mixture A, a conveying means 20 for continuously conveying the agglomerate mixture A released from the hopper 10, and an agglomerated mixture being conveyed. A vibration device 30 that forcibly applies vibration to A and a measurement device 40 that measures the surface layer and the internal surface roughness of the vibrationally separated agglomerate mixture A are provided.

In the present invention! / Agglomerate lump mixture A means a mixture of particles with different particle diameters, such as sand, gravel, crushed stone, concrete crushed material, pharmaceuticals, foods, etc. It is included.

Hereinafter, each component of the particle size measuring apparatus will be described in detail.

[0010] (2) Hopper

The hopper 10 is installed above the conveying start side of the conveying means 20 (in this example, to the right of the conveying means 20), and controls the open / close gate (not shown) provided at the lower end of the hopper 10 to control the agglomerate mixture A. The supply amount can be adjusted and the supply amount per unit time can be grasped.

[0011] In this example, the case where the hopper 10 is used as the means for supplying the agglomerate mixture A to the conveying means 20 will be described. However, various known supply means can be applied as the means for supplying the agglomerate mixture A. It is.

[0012] (3) Conveying means

The conveying means 20 is, for example, a belt-type conveyor in which an endless belt 23 is stretched between a pair of drums 21 and 22 and can convey the agglomerate mixture A from the position of the hopper 10 toward the left in the figure. ing.

The installation direction of the conveying means 20 is not limited to the horizontal installation form shown in the figure, and may be inclined up and down.

Further, the conveying means 20 is not limited to the illustrated belt type conveyor, and various conveying means can be applied. For example, the conveying means 20 may be a fixed conveying path with a downward slope. In short, it is sufficient that the agglomerate mixture A discharged from the hopper 10 can be conveyed in one direction.

[0013] (4) Excitation device A vibration device 30 is provided in a part of the conveying means 20 (in this example, the central part of the conveying means 20), and vibration can be separated according to the particle diameter by applying vibration to the agglomerate mixture A being conveyed. It is structured as follows.

In this example, the vibration exciter 30 is arranged below the upper end of the endless belt 23 to vibrate the endless belt 23 directly! As will be shown, this includes the case where the entire conveying means 20 is vibrated.

[0014] The vibration is imparted to the agglomerate mixture A being transported so that the coarser one in the agglomerate mixture A rises toward the surface layer while the smaller dimension sinks. This is because the agglomerate mixture A is vibrationally separated according to the conditions.

In this way, in the present invention, the agglomerate mixture A is vibrationally separated according to the particle size, so that it is not necessary to use various types of sieves as in the prior art. Therefore, it is possible to efficiently separate the agglomerate mixture A being conveyed in a short time.

In addition to being able to employ a known vibrator (pipe mouth motor) as the vibration device 30, a large number of irregularities are formed in advance on the support surface of the endless belt 23 and pass through these irregularities. In this case, the endless belt 23 may have a simple configuration in which vibration is applied! /. Alternatively, the endless belt 23 may be struck directly or indirectly for vibration.

The vibration device 30 is appropriately selected in consideration of the type of the agglomerate mixture A and the transport amount.

[5] (5) Measuring device

The measuring device 40 for measuring the surface roughness of the agglomerate mixture A is composed of a sensor 41 and an agglomerate mixture A exposing means arranged on the terminal end of the conveying means 20 (in this example, on the left side of the conveying means 20). A certain level rod 42, these sensors 41 and elevating means 43 for raising and lowering the level rod 42 toward the conveying means 20, and the particle size (surface roughness) data measured by the sensor 41 and the conveying amount of the agglomerate mixture A A central processing unit 44 that calculates the particle size distribution of the agglomerate mixture A based on

The sensor 41 is a known optical sensor that can electrically measure the surface roughness of a granule, and for example, a known CCD laser type displacement sensor (manufactured by Keyence Corporation) can be used. It is important that the sensor 41 and the level rod 42 are integrated, and in particular, the protruding length of the lower end of the level rod 42 is substantially coincident with the optimum measurement distance of the sensor 41.

As for the arrangement form of the sensor 41 and the level rod 42, the level rod 42 is arranged on the upstream side with respect to the sensor 41 along the conveying direction of the agglomerate mixture A.

Here, the reason why the sensor 41 and the level rod 42 are combined will be described.

If only the sensor 41 is arranged, the surface roughness of the surface layer of the vibration-isolated agglomerate mixture A can be measured, but the inner surface roughness of the hierarchically separated agglomerate mixture A can be measured. I can't.

Therefore, in the present invention, the lower part of the level rod 42 lowered together with the sensor 41 is penetrated into the agglomerated mixture A being conveyed, and the inner surface roughness of the agglomerated mixture A exposed by the level rod 42 is divided. The sensor 41 can be continuously measured.

That is, the level rod 42 functions to expose the inside of the agglomerate mixture A which has been separated by vibration to an arbitrary depth.

Therefore, the cross-sectional shape of the level rod 42 is not limited to the circular shape shown in FIG. 4, and any cross-sectional shape can be adopted, and the horizontal width of the level rod 42 is also arbitrary depending on the type of the agglomerate mixture A. Can be set to

As a result, it is possible to measure the particle size over the entire depth to the deepest part of the surface layer force of the agglomerate mixture A that has been vibrationally separated during conveyance.

[0020] The elevating means 43 that supports the sensor 41 and the level rod 42 so as to be able to advance and retreat toward the agglomerate mixture A being conveyed includes various fluid cylinders, a screw feed mechanism, and the like.

In this example, force lifting means 43 indicating that the lifting means 43 is connected to the level rod 42 integrated with the sensor 41 may be provided separately for the sensor 41 and the level rod 42.

If the sensor 41 has high performance, the sensor 41 may be fixed and installed, and only the level rod 42 may be raised and lowered.

The central processing unit 44 has a calculation program for calculating the particle size distribution of the agglomerate mixture A based on the measured value of the surface roughness measured by the sensor 41, the amount of displacement of the level rod 42, and the like. The particle size distribution of the agglomerate mixture A can be displayed in a known output form in real time. [0022] (6) Measuring method

Next, a method for measuring the particle size using the above-described particle size measuring apparatus will be described. In FIG. 1, the endless belt 23 constituting the conveying means 20 rotates in one direction. When the open / close gate at the lower end of the hopper 10 is opened, the quantitative supply of the agglomerate mixture A onto the endless belt 23 is started, and the agglomerate mixture A is mounted on the endless belt 23 and from right to left in the figure. It is conveyed toward.

In the present invention, the internal surface roughness can be determined in real time from the surface layer of the agglomerate mixture A in the following manner.

[0023] [Vibration separation process of agglomerate mixture]

[0024] As the vibration device 30 is operated, the agglomerate mixture A being conveyed is subjected to vibration and separated by vibration.

As a result, in the conveyance process, the coarser size of the agglomerate mixture A rises to the surface layer, and the finer size sinks and the agglomerate mixture A is hierarchically separated according to particle size. .

[0025] [Measurement of particle size]

As shown in FIGS. 2 to 4, when the agglomerate mixture A passes under the sensor 41 and the level rod 42 disposed above the endless belt 23, the surface roughness of the agglomerate mixture A is as follows. Measurement is performed.

[0026] Before the lower end of the level rod 42 comes into contact with the agglomerate mixture A, the sensor 41 measures the surface roughness of the surface layer of the agglomerate mixture A that has been vibrationally separated.

Next, as the elevating means 43 is extended, the sensor 41 and the level rod 42 begin to descend.

The lower part of the level rod 42 increases the amount of penetration while the surface layer of the agglomerate mixture A is divided.

[0027] By the penetration of the level rod 42, the inside of the agglomerate mixture A is divided by force, and the surface roughness is measured by the sensor 41 inside the exposed agglomerate mixture A.

While the agglomerate mixture A moves, the measurement point P of the sensor 41 remains unchanged, and only the depth of the measurement point P increases. Thus, the surface roughness is measured over the entire depth from the surface layer portion to the deepest portion of the vibration-isolated granule mixture A.

Information such as the measured surface roughness value measured by the sensor 41 and the displacement amount of the level rod 42 is sent to the central processing unit 44.

Fig. 5 shows the measurement result of the particle size measured by the sensor 41 over the entire depth of the surface layer of the agglomerate mixture A up to the deepest part.

[0029] The central processing unit 44 calculates the particle size distribution of the agglomerate mixture A in real time based on the measured values of the internal surface roughness according to the surface layer and depth of the agglomerate mixture A.

Then, the particle size distribution of the agglomerate mixture A as shown in FIG. 6 is obtained.

In addition, the surface roughness inside the agglomerate mixture A can be grasped according to the penetration amount (depth) of the level rod 42. Therefore, by measuring the displacement amount (depth) of the level rod 42, a specific particle size range can be obtained. The amount (total amount) of the corresponding agglomerate mixture A can also be calculated in real time.

[0030] It should be noted that the particle size measurement of the agglomerate mixture A is performed only for a short time for the purpose of sampling, or continuously during the transportation of the agglomerate mixture A.

[0031] (7) Other embodiments

The above is the force explained when measuring the particle size of the agglomerate mixture A while the sensor 41 and the level rod 42 are descending.On the contrary, after the level rod 42 is lowered to the deepest part of the agglomerate mixture A, It is also possible to measure the particle size of the agglomerate mixture A in the process of raising the level rod 42.

[0032] Further, as described above, as a means for exposing the inside of the agglomerate mixture A, the case where the measuring device 40 side is arranged to be movable up and down at a fixed position and the agglomerate mixture A side is configured to be movable is described. However, on the contrary, the measuring device 40 side that can be moved up and down may be configured to be movable along the surface of the granule mixture A.

In short, it is sufficient that either one or both of the measuring device 40 and the agglomerate mixture A are configured to be relatively movable.

[0033] In addition, during the transfer of the agglomerate mixture A by the conveying means 20, the surface layer part of the vibrationally separated agglomerate mixture A is forcibly removed by a removal plate (not shown) and the agglomerate mixture A after being removed Particle size measurement may be performed for In this example, when particles with a large particle size not planned for use are mixed in the agglomerate mixture A before measurement, the particles with a large particle size not planned for use are removed to be measured. Can be narrowed down.

[0034] Although the above description has been made with respect to the case where the hopper 10 is used as the means for supplying the granule mixture A to the conveying means 20, the hopper 10 may be used instead of the hopper 10 to directly supply the mixture.

If the agglomerate mixture A is supplied directly from the production device, the particle size distribution of the agglomerate mixture measured in real time can be fed back to the production device for the agglomerate mixture and used for controlling the production device.

Brief Description of Drawings

[0035] FIG. 1 is a model diagram of a particle size measuring apparatus according to the present invention.

[Fig.2] Explanatory drawing when measuring the particle size of the surface layer of the agglomerate mixture

[Figure 3] Explanatory drawing of measuring the particle size inside the agglomerate mixture

[Figure 4] Sectional view of IV-IV in Figure 3

[Fig.5] Explanatory drawing of particle size measurement result of agglomerate mixture

[Figure 6] Illustration of particle size distribution of agglomerate mixture

Explanation of symbols

[0036] A agglomerate mixture

Measurement point by P sensor

10 Hopper

20 Transport means

23 Endless belt

30 Exciter

31 Ted, bed,

40 Measuring equipment

41 sensors

42 level rod

43 Lifting means Central processing unit

Claims

The scope of the claims

[1] A particle size measuring method for measuring the particle size from the surface layer to the inside of the agglomerate mixture, forcibly giving vibration to the agglomerate mixture, and vibrating and separating the agglomerate mixture according to the particle size. The surface of the mixture and the agglomerate mixture exposure means remove the surface of the vibrationally separated agglomerate mixture and measure the internal surface roughness of the layered exposure with a sensor.

The particle size distribution of the agglomerate mixture is calculated by calculating based on at least the measured surface roughness in the range from the surface layer to the inside of the agglomerate mixture,

Particle size measurement method.

[2] In Claim 1, the inside of the agglomerate mixture separated by vibration by moving either one or both of the agglomerate mixture or the sensor and the exposure device for the agglomerate mixture. A particle size measuring method, characterized by exposing

[3] A particle size measuring device for measuring the particle size from the surface layer to the inside of the agglomerate mixture, the vibration device forcing the agglomerate mixture to vibrate and separating the agglomerate mixture, and for each particle size A measuring device for measuring the surface roughness of the vibration-separated agglomerate mixture, wherein the measuring device removes the vibration-separated agglomerate mixture and exposes the interior. Exposure means to cause,

A central processing unit for calculating the particle size distribution of the agglomerate mixture based on the measured surface roughness by the sensor,

By moving one or both of the agglomerate mixture or the sensor and exposure means constituting the measuring device, the surface roughness measurement value in the range from the surface layer to the inside of the agglomerated and separated agglomerate mixture is centrally calculated. It is characterized by calculating the particle size distribution of the agglomerate mixture by calculating in the processing unit.

Particle size measuring device.

[4] In Claim 3, the conveyance means for continuously conveying the agglomerate mixture is provided, and the sensor and the exposure means constituting the measurement device are arranged toward the conveyance means equipped with the vibration exciter. A particle size measuring apparatus characterized by

[5] In claim 4, the conveying means for the agglomerate mixture is a belt type conveyor. A particle size measuring device.

6. The particle size measuring apparatus according to claim 3, wherein the sensor and the exposing means constituting the measuring apparatus are arranged so as to be movable along the surface of the agglomerate mixture.

[7] In Claim 3, the means for exposing the agglomerate mixture integrated with the sensor is provided with an elevating means, and the sensor is synchronized with the means for exposing the agglomerate mixture by the elevating means and is configured to elevate itself. A particle size measuring apparatus characterized by