JPH08105847A - Fluorescent x-ray analyzer - Google Patents

Abstract

PURPOSE: To provide a fluorescent X-ray analyzer which can be downsized, which can stably attach a frame for fixing and holding a crystal even with an impact due to intermittent motion and which is easy to attach/remove. CONSTITUTION: A fluorescent X-ray analyzer includes a crystal exchanging device comprising a crystal holding frame 5 made of a magnetic material for fixing and holding a crystal to be analyzed and a crystal attaching block 1 which rotates by a certain angle by a driving mechanism and includes a plurality of magnets 2 with the crystal holding frame 5 freely mountable and demountable. The crystal holding frame 5 and the crystal attaching block 1 are attached/ removed by fitting two positioning pins.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent X-ray analyzer used for qualitative or quantitative analysis of elements in a sample, and more particularly to a fluorescent X-ray analyzer which is generally compact and has improved sensitivity. .

[0002]

2. Description of the Related Art When a sample is irradiated with X-rays from an X-ray tube,
New X-rays are generated from the atoms contained in the sample and radiated to the outer surface of the sample. This X-ray is called a fluorescent X-ray and has a wavelength peculiar to each element. Therefore, if the wavelength of this fluorescent X-ray is analyzed and investigated, a qualitative analysis of the sample becomes possible. In addition, since the intensity of fluorescent X-rays is proportional to the element concentration, X
Quantitative analysis of the sample can be performed by measuring the dose.
FIG. 9 is a diagram showing an outline of the configuration of such an X-ray fluorescence analyzer. That is, the sample M placed on the rotatable sample setting table 40 is moved upward by the vertical moving table 41, and the sample M is moved upward.
X-rays are radiated from the X-ray tube 43 through the primary X-ray filter 42, and the secondary X-rays emitted from the sample M are applied to the crystal W for analysis through the solar slit 44 and extracted for each wavelength. Qualitative and quantitative analysis is performed by wavelength analysis and dosimetry. The analytical crystal exchange device 45, which is one component of such a fluorescent X-ray analysis device, is equipped with a large number of analytical crystals W for the purpose of selecting a crystal suitable for the element, and can be arbitrarily selected and used.

FIG. 7 is a plan view of a concrete example of a crystal exchange device 45 of a conventional fluorescent X-ray analysis device, and FIG. 8 is a front view thereof. This crystal exchanging device is adapted to intermittently rotate to select a crystal as follows. That is, from the bevel gear 23 attached to the rotary shaft 21, the intermediate shaft 2
2 is rotated, and further, a gear 24 attached to the intermediate shaft 22 drives a gear 25, which serves as a prime mover of the Genebus top mechanism, to rotate. A pin 26 is fixed to the gear 25 and enters a groove 28a provided at a constant angular interval in a driven wheel 28 to rotate the driven wheel 28 at a fixed angle. Arm 27 at this time
The lock (stopper) disk 29 attached to the slippery slides the outer surface of the driven wheel 28 and fits into the front groove 28a to lock. And the driven vehicle 28 of the Gene Bus Top mechanism
The crystal mounting block 20 fixed to the rotating shaft 30 of the above rotates intermittently with the driven wheel 28. Reference numeral 31 is a cam that rotates together with the gear 25 serving as the driving wheel, and constitutes a cam mechanism together with a wheel 33 that is rotatably attached to an arm 27. Rock. Reference numeral 32 is a spring that constantly applies a biasing force to the arm 27.

Crystal mounting block 20 of the above crystal exchanging device
Are formed into polygons at equal angular intervals, and grooves 20a are formed on the surfaces thereof, and a frame 34 in which a crystal W is fixedly held is fitted in these grooves 20a. A spring 35 is fitted in a hole 20b formed in the bottom of the groove 20a of the crystal mounting block 20 to urge the frame 34 and press it with a fixing plate 36 from above.

[0005]

The crystal mounting block 20 of the above-described conventional crystal exchanging device has the groove 20a for inserting the frame 34 holding the crystal W and the spring 3 therein.
Since holes 20b for installing 5 must be provided, the number of processes is large, and this process is also complicated. Further, between the groove 20a and the groove 20a, it is necessary to install the two fixing plates 36, 36 and to provide a protrusion 20c having a hole for a bolt 37 for fixing these fixing plates 36. Therefore, the crystal mounting block 20 becomes relatively large. Further, when the crystal mounting block 20 becomes large, the rotation driving device and the rotation supporting portion also become large, and further the spectroscopic chamber and the like become large, so that the entire crystal exchanging device becomes large. If the entire crystal exchanging device becomes large as described above, the optical path that affects the sensitivity becomes long, which is not preferable.

The present invention has been made by paying attention to the above-mentioned problems. The crystal mounting block can be easily processed and the size thereof can be reduced, and the crystal can be formed even if there is an impact due to intermittent motion. It is an object of the present invention to provide a fluorescent X-ray analyzer which is easily attached to and detached from a crystal holding frame that holds and holds the crystal.

[0007]

In order to solve the above-mentioned problems, the present invention irradiates a sample with a primary X-ray and applies a secondary X-ray radiated from the sample to the crystal to qualitatively or quantitatively. In a fluorescent X-ray analyzer for analysis, the frame is fixed and held, and the frame is made of a magnetic material, and a plurality of magnets are attached by rotating the frame at a constant angle by a driving mechanism, and the frame is detachable. And a crystal exchanging device including the crystal mounting block. Also,
A frame made of a magnetic material that holds the crystal fixedly.
It is characterized in that the crystal and the crystal mounting block are attached and detached by fitting two positioning pins.

[0008]

The operation when the X-ray fluorescence analyzer is used as the above means will be described with reference to the accompanying drawings and the reference numerals. Since it is not necessary to provide the crystal mounting block 1 with a groove for fitting the crystal holding frame 5 or a space for fixing the crystal holding frame 1, the crystal mounting block 1 You can also reduce your overall size. Therefore, the rotation driving device and the rotation supporting portion of the crystal mounting block 1 are also reduced, and the spectroscopic chamber and the like are also reduced, so that the crystal exchanging device as a whole can be made compact. Further, the crystal holding frame 5 holding the crystal W can be easily mounted on the crystal mounting block 1 in a state of being positioned by the pins 3, and can be easily detached even when detached.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a crystal mounting block 1 which constitutes a crystal exchanging device used in a fluorescent X-ray analyzer of the present invention, FIG. 2 is a front view, and FIG. 3 is a sectional view taken along the line AA of FIG. This crystal mounting block 1 is 1 in the embodiment.
It is configured so that ten crystal holding frames 5 (described later), which are formed in a 0-gon shape and have the crystal W fixedly held, can be attached to the surface thereof. In this case, the number of angles of the crystal mounting block 1 may be hexagonal or dodecagonal and can be increased or decreased.
That is, the number of frames 5 attached can be increased or decreased.

The crystal mounting block 1 has a boss portion 1
The driven wheel 28 of the Geneva stopper mechanism described above is fitted into the hole 1b formed in a and is fitted into the rotary shaft 30 (see FIG. 8), and intermittently rotates together with the driven wheel 28. A circular shallow hole 1d is formed in the center of each surface 1c, 1c of the crystal mounting block 1, and a magnet 2 is fitted and fixed therein.

Each surface 1 of the crystal mounting block 1
pin holes 1e and 1e are formed near both ends of c and 1c,
The pin 3 is press-fitted and fitted into the hole 1e. The pins 3 fitted on each surface 1c of the crystal mounting block 1 are
As will be described later, this is a pin for positioning and mounting the crystal holding frame 5.

Next, FIG. 4 (A) is a plan view of the crystal holding frame 5, and FIG. 4 (B) is a sectional view taken along the line BB of FIG. 5 (A). The crystal holding frame 5 is formed in a U shape by a bottom plate 5a and side plates 5b, 5b, and pins formed in the central portion of the bottom plate 5a near both ends of each surface 1c, 1c of the crystal mounting block 1. Holes 5c and 5d for inserting the pin 3 press-fitted into the hole 1e are provided. In this case, the one hole 5d is a long hole, and the pin 3 and the pin 3 are press-fitted on both sides.
The error of the distance between the centers of and is absorbed.

Further, the bottom plate 5a of the crystal holding frame 5 is used.
There are two holes 5e and 5e at both ends,
This hole 5e is a hole for injecting an adhesive that fixes the crystal W as described later. The crystal holding frame 5 is made of a magnetic material such as iron, cobalt and nickel.

FIG. 5 is a sectional view (a sectional view similar to FIG. 4B) in a state in which the crystal W of the crystal holding frame 5 is fixedly held. As described above, the crystal W is held in the crystal holding frame 5. In this case, the crystal W is held in a state where it does not come into contact with any of the bottom plate 5a and the side plates 5b, 5b of the crystal holding frame 5. There must be. Specifically, the crystal holding frame 5 is inverted, and the crystal W is put between the side plates 5b and 5b from below by using a mounting jig (not shown), and the holes 5e and 5e are the upper surfaces. Then, the adhesive P is poured and fixed.

When the crystal exchanging device used in this X-ray fluorescence analyzer is constructed as described above, the groove 20a (see FIG. 8) for fitting the crystal holding frame 5 in the crystal mounting block 1 and the crystal holding block. Fixing plate 3 for fixing frame 5
Since it is not necessary to provide a protrusion 20c (see FIG. 8) for fixing 6 (see FIG. 8), the entire size of the crystal mounting block 1 itself can be reduced.

FIG. 6 shows that the crystal mounting block 1 used in the X-ray fluorescence analyzer of the present invention and the crystal mounting block 20 used in the conventional X-ray fluorescence analyzer are both octagonal and have the same size. It is a figure which compared the magnitude | size when mounting | wearing with the lens 5. As can be clearly seen from this figure, since the crystal mounting block 1 can be made small, the rotary drive unit and the rotary support unit can be made small, and the spectroscopic chamber and the like can also be made small, resulting in a compact crystal exchanging device as a whole. You can do it. Further, the crystal holding frame 5 holding the crystal W can be easily mounted on the crystal mounting block 1 in a state of being positioned by the pins 3, and can be easily removed even when detached.

[0017]

As described in detail above, according to the fluorescent X-ray analysis apparatus of the present invention, the processing of the crystal mounting block can be easily and small-sized, so that the entire crystal exchange apparatus can be downsized. Therefore, the spectroscopic chamber can be made smaller to improve the sensitivity. Further, the attachment / detachment of the crystal holding frame that holds the crystal fixed becomes extremely easy, and even if the crystal holding frame is attached, the pin is positioned and fixed with the press-fitted pin, so that even if there is some impact during the intermittent movement. It can be stably fixed to the crystal mounting block.

[Brief description of drawings]

FIG. 1 is a plan view of a crystal mounting block that constitutes a crystal exchanging device used in a fluorescent X-ray analyzer according to the present invention.

FIG. 2 is a front view of a crystal mounting block that constitutes a crystal exchanging device used in the fluorescent X-ray analyzer of the present invention.

FIG. 3 is a sectional view taken on line AA of FIG. 2;

4 (A) is a plan view of a crystal holding frame, and FIG. 4 (B) is a sectional view taken along the line BB of FIG. 4 (A).

5 is a cross-sectional view of the crystal-holding frame in a state of holding crystals (same direction as the cross-sectional view taken along the line BB of FIG. 4A).

FIG. 6 is a hexagonal crystal mounting block used in the X-ray fluorescence analyzer of the present invention and a crystal mounting block used in the conventional X-ray fluorescence analyzer, each of which is equipped with a crystal holding frame of the same size. It is the figure which compared the size in the case.

FIG. 7 is a plan view of a crystal exchange device of a conventional fluorescent X-ray analysis device.

FIG. 8 is a front view of a crystal exchange device of a conventional fluorescent X-ray analysis device.

FIG. 9 is a diagram showing an outline of an X-ray fluorescence analyzer.

[Explanation of symbols]

 1 crystal mounting block 2 magnet 3 pin 5 crystal holding frame 5a bottom plate 5b side plate

Claims (2)

[Claims] 1. A fluorescent X-ray analyzer for irradiating a sample with a primary X-ray and applying a secondary X-ray radiated from the sample to a crystal for qualitative or quantitative analysis. A crystal exchanging device comprising a crystal holding frame made of a material, and a crystal mounting block which is rotated by a drive mechanism at a constant angle and a plurality of magnets are mounted on the surface to detachably attach the crystal holding frame. An X-ray fluorescence analyzer provided with: 2. The fluorescent X-ray according to claim 1, wherein the crystal holding frame which holds the crystal fixedly, and the crystal mounting block made of a magnetic material and the crystal mounting block are attached and detached by fitting two positioning pins. Analysis equipment.