JPH07218456A - Fluorescent x-ray analyzer - Google Patents

Abstract

PURPOSE:To provide a fluorescent X-ray analyzer equipped with a crystal exchanging device which can make intermittent revolving motions smoothly, is less in motor output, does not give much shocks when the device makes intermittent revolving motions, and can revolve in all directions for selecting crystals. CONSTITUTION:An X-ray fluorescence analyzer is equipped with a crystal exchanging device composed of a crystal fitting block fixed to a rotating shaft 3 supported by a frame 1, locking disc 8 which is fixed to the shaft 3 and provided with a V-groove 8a, positioning disc 9 provided with a position detecting groove 9a, arm 11 which is fitted with a locking bearing 12 put in the groove 8a and pivotally attached to the frame 1, solenoid 15 for driving the arm 11, spring 10, and sensors 14 and 16 for detecting the position detecting groove 9a of the disc 9.

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 when qualitatively or quantitatively analyzing an element in a sample, and particularly to a crystal that alleviates impact during intermittent rotation and requires a small motor output. The present invention relates to an X-ray fluorescence analyzer equipped with an exchange device.

[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. 6 is a diagram showing an outline of the configuration of such a fluorescent X-ray 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.
Is irradiated with X-rays from the X-ray tube 43 through the primary X-ray filter 42, and the secondary X-rays emitted from the sample M to the outside are applied to the analysis crystal W through the solar slit 44 and extracted for each wavelength. Qualitative and quantitative analyzes are 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. 4 is a plan view of a crystal exchange device of a fluorescent X-ray analyzer which has been used conventionally, and 5 is a front view. This crystal exchanging device is adapted to intermittently rotate to select a crystal as follows. That is, the rotating shaft 21
Rotate the intermediate shaft 22 from the bevel gear 23 attached to
Further, a pin 26 is provided via a gear 24 attached to the intermediate shaft 22.
Is fixed and the gear 25, which serves as the prime mover of the Geneva top mechanism, is rotationally driven. Then, the pin 26 of the gear 25 enters a groove 28a provided at a constant angle interval in the driven wheel 28 to rotate the driven wheel 28 by a constant angle. At this time, the lock (stopper) disk 29 attached to the arm 27 is attached to the driven wheel 28.
The outer surface of the slippery slides and is fitted into the front groove 28a and locked. The crystal mounting block 20 fixed to the rotary shaft 30 of the driven wheel 28 of the Geneva top mechanism is adapted to rotate intermittently together with the driven wheel 28.
Reference numeral 31 is a cam that rotates together with the gear 25 that serves as the driving wheel, and drives the arm 27 via a bearing 33. Reference numeral 32 is a spring that constantly applies a biasing force to the arm 27.

[0004]

As described above, in the conventional crystal exchanging device, the locking disk 29 is always the spring 32.
Due to the frictional force caused by being pressed against the follower wheel 28 of the Geneva top mechanism, the capacity of the input motor increases, and the locking disk 29 has the groove 2 of the follower wheel 28.
Since the impact force when entering 8a is relatively large and the fixing of the crystal may loosen or come off, a situation in which measurement is impossible is likely to occur. For ensuring the accuracy of the intermittent rotation motion, the groove 28a of the driven wheel 28 and the lock It is necessary to adjust the abutting part of the disk 29 by hand, which requires a lot of adjustment man-hours. Since the lock mechanism of the Geneva top mechanism is operated smoothly, it can only be rotated in one direction, so it is the maximum for crystal selection. It is necessary to rotate while applying an impact of almost one rotation, which causes a problem that the set time becomes long and therefore the total measurement time becomes long. The present invention has been made in view of the above problems, and an object thereof is to smoothly perform intermittent rotation motion of a block on which a crystal is attached and to reduce motor output and impact during intermittent rotation. It is an object of the present invention to provide a crystal exchange device capable of rotating in the direction of and selecting a crystal.

[0005]

In order to solve the above-mentioned problems, the present invention irradiates a sample with primary X-rays and rotates secondary X-rays emitted from the sample by a constant angle. In a fluorescent X-ray analyzer for performing a qualitative or quantitative analysis on interchangeable analytical crystals, a crystal mounting for fixing a plurality of crystals fixed to a rotary shaft mounted on a frame so as to be rotatable by a driving mechanism. A block, a locking disk fixed to the rotating shaft and provided with V grooves at equal angular intervals in the circumferential direction, a positioning disk provided with position detection grooves at equal angular intervals in the circumferential direction, and the locking disk. A lock bearing or ring that fits in a groove is attached to the tip end of the arm, which is pivotally attached to the frame so as to be rotatable in a fixed angle range, a solenoid for driving the arm, and the arm. The above-mentioned fla A spring attached to the arm, a sensor for detecting the position detection groove provided in the positioning disc, characterized in that with more made crystal changer.

[0006]

The operation of the X-ray fluorescence analyzer as the above means will be described with reference to the accompanying drawings (FIGS. 1 to 3) and the reference numerals. A DC motor 2 that serves as a drive mechanism for the rotating shaft 3, sensors 14 and 16 that sense the position detection groove 9a, and an arm 1
The solenoid 15 for driving 1 is a processing unit (CP
U), and they are operated when performing qualitative analysis or quantitative analysis with a fluorescent X-ray measuring device. An arm 11 having one end rotatably pivotally attached to the frame 1.
Is normally urged by a spring 10 and attached to a locking bearing 12 at the tip of the arm so that a V groove 8a of a locking disk 8 is formed.
It is in the locked state. When selecting the crystal W, when the solenoid 15 is turned on, the arm 11 rises against the urging force of the spring 10, the lock bearing 12 is disengaged from the groove 8a of the lock disk 8, and the rotary shaft is rotated. 3, the lock disk 8, the positioning disk 9 and the like are rotatable. The sensors 14 and 16 can be used in combination with the positioning disc 9 to constantly measure the memory of the current position and the intermittent movement amount, and rotate the DC motor 2 until the required crystal is selected. When the required crystal is selected, the DC motor 2 is stopped and the solenoid 15 is turned off. Then, the arm 11 is pulled by the urging force of the spring 10, and the locking bearing 12 at the tip portion is V of the locking disk 8 at that position.
Entering the groove 8a, the rotating shaft 3, the locking disk 8 and the positioning disk 9 cannot rotate.

[0007]

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 including a partial cross section of a crystal exchange device used in the X-ray fluorescence analyzer of the present invention.
Is a front view, and FIG. 3 is a side view including a partial cross section. Reference numeral 1 denotes a frame, on which a rotary shaft 3 is mounted by being mounted on a shaft, and a crystal mounting block 5 is rotatably fixed to the rotary shaft 3 by a double nut 7. In this embodiment, the crystal mounting block 5 is a decagon and is capable of mounting 10 crystals W, but the number of mounted crystals can be increased or decreased. A DC motor 2 is attached to the frame 1 and a belt 6 wound around the end of the pulley 4 and the rotating shaft 3 is provided.
The rotating shaft 3 having the crystal mounting block 5 mounted thereon can be rotated. The rotation drive mechanism of the rotary shaft 3 may be gear drive or timing belt drive instead of belt drive.

The rotary shaft 3 has Vs at equal angular intervals in the circumferential direction.
A locking disc 8 provided with a groove 8a is fixed, and position detecting grooves 9 are provided at the tip of the locking disc 8 at equal angular intervals in the circumferential direction.
The positioning disk 9 provided with a is fixed. The phase relationship between the locking disk 8 and the positioning disk 9 is adjusted and then fixed to the rotary shaft 3.

An arm 11 is pivotally mounted on the frame 1 so as to be rotatable by a predetermined angle. The arm 11 is also attached to the frame 1 via a bracket 13. The solenoid 15 is turned on and off to rotate the solenoid 15 within a certain angle range. A spring 10 is mounted between the arm 11 and the frame 1, and the arm 1
A biasing force is always applied to 1 in the direction of the lock disk 8. A lock bearing 12 is attached to the tip of the arm 11, and the lock bearing 12
Is a solenoid 15 for rotating the arm 11 within a certain range.
It is adapted to be fitted into and removed from the V groove 8a of the lock disk 8 fixed to the rotary shaft by the ON and OFF operations of.
The lock bearing 12 may be replaced with a ring.

Next, two sensors (optical sensors in the embodiment) 14 and 16 are attached to the frame 1, and these sensors 14 and 16 are attached so that the positioning disc 9 blocks light. is there. When the position detecting groove 9a provided on the positioning disk 9 reaches the positions of these sensors 14 and 16, they are detected. In this case, one sensor 14 is the origin sensor, and the other sensor 16 is the crystal selection sensor mounted on the crystal mounting block 5. The sensors 14 and 16 are for selecting an appropriate crystal for analysis mounted on the crystal mounting block 5, and the selection is made by the position detection groove 9a provided on the positioning disk 9.
Therefore, other sensors such as a magnetic sensor, an ultrasonic sensor, a sensor utilizing an electrical change, or a mechanical contact means may be used instead of these sensors 14 and 16. good.

The crystal exchange device of the X-ray fluorescence analyzer of the present invention has the above-mentioned structure, and is a DC for driving the rotating shaft 3.
The motor 2, the sensor 14 for confirming the origin position, the solenoid 15 for driving the arm 11 with the sensor 16 for detecting the crystal position to be used, etc. are connected to the arithmetic processing unit (CPU),
The fluorescent X-ray measuring device is operated when performing qualitative analysis or quantitative analysis. The operation will be described below. (1) The arm 1 whose one end is rotatably pivotally attached to the frame 1.
1, a lock bearing 12 is normally biased by a spring 10 and attached to the tip of the arm.
It is fitted in a and is in a locked state. (2) Turn on the solenoid 15 when selecting the crystal W
Then, the arm 11 rises against the urging force of the spring 10, the locking bearing 12 is disengaged from the groove 8a of the locking disk 8, and the rotary shaft 3, the locking disk 8 and the positioning disk 9 are moved. Etc. can be rotated. (3) The sensors 14 and 16 can be combined with the positioning disk 9 to constantly measure the memory of the current position and the intermittent movement amount, and the motor 2 can be rotationally driven until the required crystal is selected. (4) When the required crystal is selected, the motor 2 is stopped and the solenoid 15 is turned off. Then, the arm 11 is pulled by the urging force of the spring 10, and the locking bearing 12 at the tip portion is V of the locking disk 8 at that position.
Entering the groove 8a, the rotating shaft 3, the locking disk 8 and the positioning disk 9 cannot rotate.

[0012]

Since the X-ray fluorescence analyzer of the present invention is constructed as described above in detail, the torque for rotationally driving the crystal mounting block can be made extremely small and the driving motor can be made compact and lightweight. You can do it. Further, the movement of the locking arm is minimized, and the biasing force of the spring can be reduced. Therefore, it is possible to reduce the impact when the locking bearing enters the V groove of the locking disk when locking the crystal mounting block, and the intermittent rotation drive of the crystal mounting block becomes smooth. Furthermore, the impact when the solenoid is turned on can be reduced.
Moreover, since the origin position and the position of the crystal to be selected can be detected by the sensor, it is possible to provide a crystal exchanging device capable of rotating in any direction and selecting the crystal.

[Brief description of drawings]

FIG. 1 is a plan view including a partial cross section of a crystal exchange device used in an X-ray fluorescence analyzer of the present invention.

FIG. 2 is a front view including a partial cross section of a crystal exchange device used in the X-ray fluorescence analyzer of the present invention.

FIG. 3 is a side view including a partial cross section of a crystal exchange device used in the X-ray fluorescence analyzer of the present invention.

FIG. 4 is a plan view of a crystal exchange device of a conventional fluorescent X-ray analysis device.

FIG. 5 is a front view of a crystal exchange device of a fluorescent X-ray analysis device which has been conventionally used.

FIG. 6 is a diagram showing an outline of an X-ray fluorescence analyzer.

[Explanation of symbols]

1 Frame 2 DC Motor 3 Rotating Shaft 5 Crystal Mounting Block 8 Disk for Locking 8a V Groove 9 Positioning Disk 9a Position Detection Groove 10 Spring 11 Arm 12 Lock Bearing 15 Solenoid 14, 16 Sensor

Claims (1)

[Claims] 1. Fluorescence for qualitative or quantitative analysis by irradiating a sample with primary X-rays, rotating secondary X-rays radiated from the sample by a fixed angle, and applying the crystals to an exchangeable analytical crystal for exchange. In an X-ray analyzer, a crystal mounting block fixed to a rotary shaft rotatably mounted on a frame so as to be rotatable by a driving mechanism, and a V-groove fixed to the rotary shaft at equal angular intervals in the circumferential direction. The locking disk provided with the positioning disk and the positioning disk provided with position detection grooves at equal angular intervals in the circumferential direction, and the locking bearing or ring that fits in the groove of the locking disk are attached to the tip end of the frame. An arm pivotally attached in a fixed angle range, a solenoid for driving the arm, and a spring attached to the frame by urging the arm toward the locking disc. Detects the position detection groove provided on the positioning disc A fluorescent X-ray analysis device comprising a sensor and a crystal exchange device.