JPH034925Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a particle size distribution measuring device, particularly a centrifugal particle size distribution measuring device.

<Prior art> Fig. 2 shows a schematic configuration of a conventional centrifugal particle size distribution analyzer, in which 1 is a disk holding a sample cell S with good light transmittance, made of aluminum, for example, and a motor 2. It is attached to the rotating shaft 3.
The motor 2 has a shock absorber 4 made of a spring or the like.
It is provided on the mounting base 5 via. 6 is a light source consisting of, for example, a tungsten halogen lamp;
Reference numeral 7 denotes a light receiver composed of, for example, a plurality of silicon photodiodes, and both 6 and 7 are mounted on a support frame 8 erected on the mounting base 5 so as to face each other with the disk 1 interposed therebetween.

When the motor 2 is installed on the mounting base 5 via the shock absorber 4 as described above, vibrations caused by a shift in the center of gravity of the disc 1 when the disc 1 rotates are prevented, and the rotating shaft 3 is not rotated in the torsional direction. It has the advantage of being able to prevent force from acting on it.

However, the so-called rotation system such as the disk 1 and the motor 2 is not fixed to the mounting base 5, but is attached to the shock absorber 4 which has a horizontal movement margin.
On the other hand, the so-called optical system of the light source 6 and the light receiver 7 is fixed to the support frame 8 erected on the mounting base 5. There is a possibility that the sample cell S will shift from a fixed position on the optical axis, making it impossible to perform accurate measurements.

That is, in the conventional apparatus, since the rotation system and the optical system were provided independently of each other, there was a risk of misalignment between the sample measurement point of the disk 1 (the installation position of the sample cell 1) and the measurement optical axis.

<Problems to be solved by the invention> The invention was made with the above-mentioned considerations in mind, and it is possible to accurately measure without causing any deviation between the sample measurement point and the measurement optical axis when rotating the disk for measurement. An object of the present invention is to provide a particle size distribution measuring device that can perform measurements.

<Means for solving the problem> In order to achieve the above-mentioned object, in the present invention, a mounting member is provided on a motor that rotationally drives a disk holding a sample cell and is equipped with a shock absorber. A light source and a light receiver are provided.

By doing so, the rotation system and the optical system are integrated, and there is no change in the relative positional relationship between the two systems, so that no deviation occurs between the sample measurement point and the measurement optical axis.

<Example> Hereinafter, an example of the present invention will be described based on FIG. 1. In FIG. 1, the same or equivalent components as those shown in FIG. 2 are designated by the same reference numerals, and their explanations will be omitted.

Reference numeral 9 denotes a mounting member, which is a disk 1 that holds the sample cell S.
The motor 2 is attached to a motor 2 that rotates the motor 2. A light source 6 and a light receiver 7 are provided on this mounting member 9 so as to face each other with the disk 1 interposed therebetween.

By integrally configuring the optical system such as the light source 6 and the light receiver 7 and the rotation system such as the disk 1 and the motor 2, even if the rotation system shifts in the direction of the arrow in the figure during measurement, the optical system remains unchanged. There is no deviation in the same direction by approximately the same amount, and there is no change in the relationship between the sample measurement point on the disk 1 and the measurement optical axis, and the relative relationship between the two is always constant, so measurement errors due to deviation can be eliminated. can.

<Effects of the invention> As described above, in the present invention, a mounting member is provided on a motor that rotationally drives a disk holding a sample cell and is equipped with a shock absorber, and the mounting members are mounted so that they face each other across the disk. Since the light source and the light receiver are provided on the mounting member, the positional relationship between the sample measurement point on the disk and the measurement optical axis can always be maintained constant,
Measurement errors due to positional deviation are eliminated, and a highly reliable particle size distribution measuring device can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a particle size distribution measuring device according to the present invention, and FIG. 2 is a configuration diagram showing a conventional device. 1...disk, 2...motor, 6...light source, 7...
...Photodetector, 9...Mounting member, S...Sample cell.

Claims (1)

[Scope of utility model registration request] A mounting member is provided on a motor that rotationally drives a disk holding a sample cell and is equipped with a shock absorber,
A particle size distribution measuring device characterized in that a light source and a light receiver are provided on the mounting member so as to face each other with the disc interposed therebetween.