JPH0518882A - Measuring device for grain size distribution - Google Patents

Abstract

PURPOSE:To obtain a grain size distribution measurement device capable of indicating the data by which the time variation of the grain size distribution can be grasped in a grance for the grain diameter and the grain mass points of view. CONSTITUTION:Provided are a storage means (b) to store plural groups of grain size distribution measurement results, an arithmetic means (c) to calculate for indicating the data stored in the storage means in a graph consisting of three axes of the grain diameter, grain mass and measurement order, and an indication means d to indicate the results in a three dimensional graph constituted of the three axes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a particle size distribution measuring device based on an arbitrary measuring principle, and particularly to a powder process or the like which requires continuous measurement of particle size distribution to grasp temporal changes or fluctuations thereof. The present invention relates to a particle size distribution measuring device suitable for use in.

[0002]

2. Description of the Related Art As a method for measuring the particle size distribution of powder and granules, there are a sedimentation method, a laser diffraction method, an electric resistance method, a light shielding method, a sieving method, a microscope method and the like, and any one of them can be measured. An apparatus for automatically measuring the particle size distribution using the principle has already been put into practical use. By the way, in a powder process or the like, it is necessary to know the temporal variation of the particle size distribution of the manufactured powder or the powder used as a raw material. Conventionally, a particle size distribution measuring device having a function of displaying data relating to such a temporal change of the particle size distribution has already existed.

FIG. 5 and FIG. 6 are views showing display examples of temporal variation of particle size distribution by a conventional device. In the example shown in FIG. 5, the vertical axis is the particle size, and the horizontal axis is the measurement order (file number).
It is configured to display how, for example, the 80% diameter, the 10% diameter, or the mode diameter of the integrated distribution changes with time.

Further, in the example shown in FIG. 6, the vertical axis represents the amount of particles and the horizontal axis represents the measurement order, for example, to show how the amount of particles of 1 μm and the amount of particles of 5 μm changed. Is configured.

[0005]

By the way, in the conventional display method as described above, the change in a specific portion of the particle size distribution is known, but information other than the designated parameter (point) is not shown. Here, the particle size distribution is originally continuous, and changes often occur outside the designated point, so continuous information is particularly required in powder processes and the like. In addition, it is not possible to read the information using the particle diameter as a parameter from the time-dependent change graph using the particle amount as a parameter, and it is not possible to know the bidirectional change in the particle amount and the particle diameter.

The present invention has been made in view of the above points, and provides data capable of grasping a temporal change in particle size distribution from both the amount of particles and the particle size without setting any particular points. It is intended to provide a particle size distribution measuring device capable of displaying.

[0007]

In order to achieve this object, the particle size distribution measuring apparatus of the present invention has a plurality of sets of particle size distribution measurement results by the particle size distribution measuring means a as shown in the basic conceptual diagram of FIG. Storage means b for storing and this storage means b
The multiple particle size distribution data stored in
Calculation means c for calculating so that it can be displayed on a graph composed of three axes of particle amount and measurement order, and display means for displaying the calculation result on a three-dimensional graph consisting of three axes of particle diameter, particle quantity and measurement order. characterized by having d.

[0008]

When a continuous particle size distribution curve having the particle diameter and the particle amount as the two axes is arranged in the measurement order on the axis orthogonal to the two axes, the entire continuous particle size distribution is represented in time series. The relationship between items on any one of these three axes and items on the other axes was found without setting points to be noticed, and information on changes in particle size distribution can be obtained. It will dramatically increase.

[0009]

Embodiment FIG. 2 is a block diagram showing the overall configuration of the present invention. The particle size distribution measuring unit 1 is a measuring system based on an arbitrary principle such as a laser diffraction type or a centrifugal sedimentation type, and the data measured here is sent to the computer 3 via the input / output interface 2. The data from the particle size distribution measuring unit 1 may be data in the form of particle size distribution, or may be raw measurement data. The computer 3 converts the particle size distribution data in the case of the former data into the particle size distribution data in the case of the latter data, and then stores it in the memory 4 together with the information of the measurement order.

The above operation is repeated a plurality of times, and the time series particle size distribution data is accumulated in the memory 4. An input terminal 5 for inputting commands and the like to the computer 3 is connected to the input / output interface 2, and the computer 3 has a display device for displaying a graph of a three-dimensional particle size distribution change described later. 6
Are connected. Then, by inputting an output condition and the like from the input terminal 5, the computer 3 is configured to perform arithmetic operation so that the particle size distribution data accumulated in the memory 4 can be displayed in a three-dimensional graph and display the data on the display device 6. ing.

FIG. 3 is a flow chart showing the procedure for obtaining the temporal variation of the particle size distribution using the embodiment of the present invention.
Hereinafter, the method of use and operation of the embodiment of the present invention will be described with reference to this drawing. After the particle size distribution measuring unit 1 measures the particle size distribution as many times as necessary, the output condition and the output command are input from the input terminal 5 as necessary. As a result, the computer 3 calls up the corresponding data from the memory 4, performs data processing so that the data can be displayed in a graph with the particle diameter, the particle amount, and the measurement order as axes, and supplies the data to the display device 6.

FIG. 4 is a graph showing a display example by the display device 6 according to the embodiment of the present invention. The differential particle size distribution curve in which the vertical axis represents the relative particle amount% and the horizontal axis represents the particle size μm is shown in each of these graphs. It is a graph showing the change over time of the three-dimensional particle size distribution, which is arranged in the measurement order on the axis orthogonal to the axis.
In the graph according to the embodiment of the present invention shown in FIG. 4, the temporal change of the continuous particle size distribution itself can be seen at a glance, and any item of the particle diameter, the particle amount, and the measurement order can be set without setting a point of particular interest. Regarding, it is possible to immediately read the relationship with other items.

By using a CRT or the like as the display device 6, each time the particle size distribution measuring unit 1 measures, the particle size distribution data is stored in the memory 4, and at the same time, the data is displayed on the display device 6 in real time. It can also be configured to additionally display. Further, in the example of FIG. 4, the particle size distribution curve is a differential type curve in which the vertical axis represents the relative particle amount, but it is also possible to use an integrated type particle size distribution curve in which the vertical axis represents the integrated particle amount.

Further, the way of three axes (correspondence between each parameter and each direction axis) is not limited to that shown in FIG.
Of course, it is possible to make a graph in which each item is taken along an axis in an arbitrary direction.

[0015]

As described above, according to the present invention, the particle size distribution data measured a plurality of times is accumulated in the memory, and the data is converted into a triaxial graph of particle diameter, particle amount and measurement order. Since it is configured to display, the temporal change of continuous particle size distribution can be grasped at a glance. As a result, it is possible to know the change in the overall particle size distribution without needing to set a particular point of interest as in the conventional case and thus not overlooking the change. As described above, the fact that the mutual relationship among the particle diameter, the particle amount, and the three items in the measurement order can be grasped at a glance has dramatically increased the information about the change in the particle size distribution as compared with the conventional two-dimensional graph. This means that it can be an optimal device for controlling the particle size distribution of powder processes.

[Brief description of drawings]

FIG. 1 is a basic conceptual diagram showing the configuration of the present invention.

FIG. 2 is a block diagram showing the overall configuration of an embodiment of the present invention.

FIG. 3 is a flowchart showing the measurement procedure.

FIG. 4 is a graph showing a display example of changes in particle size distribution according to an embodiment of the present invention.

FIG. 5 is a graph showing a display example of a particle size distribution change by a conventional device.

FIG. 6 is a graph showing a display example of changes in particle size distribution by the conventional device.

[Explanation of symbols]

 1 ... Particle size distribution measuring unit 2 ... Input / output interface 3 ... Computer 4 ... Memory 5 ... Input terminal 6 ... Display device

Claims (1)

Claim: What is claimed is: 1. An apparatus for measuring the particle size distribution of a sample powder or granular material, comprising: storage means for storing a plurality of sets of particle size distribution measurement results; and a plurality of sets of particle size distributions stored in the storage means. Calculation means for calculating the data so that the data can be displayed on a graph composed of three axes of particle diameter, particle amount and measurement order;
A particle size distribution measuring device comprising display means for displaying the calculation result on a three-dimensional graph consisting of the three axes.