JPS6123824Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention is a highly radioactive liquid sample collection device in which a sample collection bottle is conveyed from a loading tube to a collection position of a needle head device and from there to a discharge tube. Regarding.

[Conventional technology]

During reprocessing of spent nuclear fuel, the fuel element is mechanically broken and the fuel is dissolved from the shattered cladding using nitric acid. The highly radioactive fuel solution produced in this case contains, in addition to the nitrate solution of uranium, plutonium fission products and actinides, insoluble components of the noble metals of the fuel and the fission products. The highly radioactive solution after solvent extraction and concentration in the vaporizer also contains other solvent degradation products.
There is therefore a need to provide sampling equipment to monitor and supervise the processing process to ensure that samples for laboratory analysis can be obtained from the solution being processed.

For this purpose, the known method uses an automated six-fold sampling device, in which the needle head, which is known per se, is often damaged for structural reasons. Installing protective filters and automatic cleaning devices can solve this problem to some extent, but it does not provide a fundamental solution. Contamination due to backflow of radioactive materials often occurs when cleaning equipment is used.
The effectiveness of anti-reflux filters is significantly reduced by viscous organic degradation products. During maintenance, inspection and repair, the accumulation of radioactive materials due to the integration of the supply pipe and return pipe and the needle head pose significant obstacles. Furthermore, there is a risk that radioactive materials may leak from the box as the revolver head of the sampling device rotates and moves up and down.

Other known methods use manually operated sampling devices, but since the sampling bottles must be loaded by a manipulator and transported after sample collection, automation of the device is extremely difficult.

[Problem that the invention attempts to solve]

The purpose of this invention is to be able to reliably collect samples from highly radioactive processing solutions containing solid substances, and to
It is possible to hermetically seal parts that may be contaminated by contact with solutions (alpha ray technology), and operation and maintenance inspections can be performed without or under shielding from gamma rays (gamma ray technology).
The purpose of the present invention is to provide a sample collection device.

[Means for solving problems]

According to the present invention, in the apparatus of the type mentioned at the beginning, there is provided a drive shaft which rotates forward and backward to which a feed nut is fixed, a spindle screwed into this nut, and a specimen which is fixed to the end of this spindle and which rotates in both directions. A revolver head with a notch for accommodating a collection bottle, a locking pin that cooperates with a stopper mechanism fixed to the outer surface of the head to define the rotation angle and axial travel distance of the revolver head, and the revolver head is rotatable. This is achieved by providing a magnetic coupling which connects the spindle and the feed nut together in a wide angular range.

According to an advantageous embodiment of the invention, the notch is provided eccentrically at the free end of the revolver head and communicates with the needle head at the sampling location.

In yet another embodiment, the loading and unloading tubes are brought into selective communication with a notch in the revolver head by rotation of the drive shaft upon engagement of the magnetic coupling.

Furthermore, it is advantageous if the drive shaft connected to the drive mechanism, the feed nut, the spindle, the stopper mechanism, the revolver head and the needle head are each arranged parallel to the horizontally arranged mounting member. Preferably, the drive shaft can be inserted in a liquid-tight manner into the isolation chamber by means of a mounting flange. The magnetic coupling is preferably constructed from two mutually connectable magnetic rings, one ring being provided on the flange of the feed nut and the other ring being provided on the flange of the revolver head.

[Effect of idea]

An advantage of the invention is that by using a conical needle head with a ventilator nozzle, the risk of blockage can be almost completely avoided and leakage of solution during removal of the bottle can be avoided. The sampling device is activated only when the drive shaft has rotated, for example, by 300°, and the drive shaft can be reliably sealed by means of an O-ring seal. Axial movements of the drive shaft in the penetration, which could cause contamination to spread along the shaft, are thereby avoided. A plurality of sampling devices according to the present invention can be arranged in parallel in a box, thereby avoiding the accumulation of radiation sources by means of integrated sampling tubes in conventional multiple sampling devices. In addition to manual operating mechanisms, robust pneumatic or electric drive mechanisms can be used to drive the sampling device. There is no need to provide a limit switch inside the box which is prone to failure. This is because the device travels towards a fixed stop. Control of the device is also extremely simple since there are only two end positions.

For cleaning the sampling tube, a cleaning terminal can be easily installed in place of the conical needle head, and the supply and return tubes can be cleaned separately with pressurized water or steam.

The sampling device according to the present invention can be installed and removed using simple equipment, and if necessary, can be removed without causing contamination by covering the entire device with a plastic bag.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

The highly radioactive liquid sample collection device containing a solid substance component has an installation flange 1 liquid-tightly fixed to a box 17, a tubular installation member 2 provided in the horizontal direction, and a sample collection needle. It consists of a needle head 21, a holding mechanism 3 for this head, and a transport mechanism for a sample collection bottle 14. This conveyance mechanism is provided in parallel with the installation member 2, and the O-ring 22
A drive shaft 4 that is sealed and operated by a drive mechanism 16, a feed nut 5 fixed to this drive shaft 4, a spindle (threaded rod) 6 screwed into this feed nut 5, and a spindle (threaded rod) 6 fixed to this It consists of revolver head 7. A notch (pocket) 13 is eccentrically provided on the end side of the head 7, in which the loading tube 1 is inserted in the loading position (the position shown in FIG. 3).
The sampling bottles 14 from 1 are loaded. A locking pin 8 is attached to the outer surface 15 of the revolver head 7 with a connecting bolt 23. The installation member 2 has a guide groove 24 so as to engage with this locking pin 8.
A stopper mechanism 10 having a stopper mechanism 10 is fixedly provided. Flange 25 attached to feed nut 5
and a flange 20 attached to the revolver head 7.
and magnetic rings 18 and 19 coupled to each other.
The coupling is released by the cooperative action of the guide groove 24 and the locking pin 8.

For loading and unloading the sample collection bottle 14, the loading tube 11 and the unloading tube 26 provided below are used (see FIG. 3), and the unloading tube 26 is connected to the pneumatic tube 12, which is itself known. ing. The loading or unloading position shown in FIG. 3 is achieved when the magnetic coupling 9 is engaged as shown in FIG. 2a. It is advantageous if the discharge pipe 26 can be turned in a horizontal position about the axis 27 of the revolver head 7, so that the notch 13 as well as the opening 28 (see FIG. 2) into the pneumatic pipe 12 are free from any malfunction. It can be opened for inspection when a problem occurs.

The sampling device is installed in a box 17 equipped with a monitoring window. The drive mechanism 16 merely rotates the drive shaft 4 forward and backward within a certain angular range, for example, 0 to 300 degrees. This ensures the sealing performance of the gaskets 22, 29, 30 even during long-term operation.

The sample collection process using the device of the present invention is as follows.

In the rest position (not shown) the magnetic coupling 9
are in a connected state, and the revolver head 7 is connected to the delivery pipe 2.
6 to the loading tube 11 (see FIG. 2a), and the notch 13 is located, for example, in a position that opens directly downward in FIG. 3. If a sample is to be collected from this state, the drive shaft 4 is rotated by the drive mechanism 16 manually, pneumatically or electrically, for example, in the direction of the clock hands at a rotational speed of 0.5 revolutions/second. This rotational movement is caused by the magnetic couplings 9, 18,
19 to the revolver head 7. When the revolver head 7 rotates, for example, 135 degrees and reaches the loading position shown in FIG. can be stopped. At this position, the empty sample collection bottle 14 is pulled out of the loading tube 11 by its own weight into the notch 1 of the revolver head 7.
It falls into 3 and enters. The end of the sampling bottle 14 is closed with a rubber diaphragm into which a sampling needle can be pierced. As described above, when the revolver head 7 hits the guide groove 24 of the stopper mechanism with the locking pin 8 and is stopped from rotating,
The drive shaft 4 continues to rotate further, for example up to 300°.
In this case, the rotary motion is converted into an axial motion by the cooperative action of the feed nut 5 fixed to the drive shaft 4 and the spindle 6 of the revolver head 7 screwed into the feed nut 5, and the flanges 20, 25 move away from each other. , the magnetic coupling 9 is released and the revolver head 7 is moved axially towards the needle head 21. Its movement is guided by the guide groove 24 of the stopper mechanism 10. When the drive shaft 4 rotates 300 degrees and the locking pin 8 of the revolver head 7 reaches the end of the guide groove 24 of the stopper mechanism 10 (first
2), the operation of the drive mechanism 16 is stopped, thereby stopping the rotation of the drive shaft 4 and the axial movement of the revolver head 7. In this state, the sample injection needle of the needle head 21 pierces and penetrates the rubber diaphragm of the sample bottle 14, so that the sample injection bottle 14
is connected to the sample collection circuit (sample collection tube),
The sample is injected into the bottle.

When the sample collection bottle 14 is filled with a sample, the drive mechanism 16 is operated so that the drive shaft 4 is rotated from 300° to 0° in the direction opposite to the direction in which the clock hands advance. First, since the needle head 7 is prevented from rotating due to the positional relationship between the guide groove 24 of the stopper mechanism 10 and the locking pin 8, the revolver head 7 is first moved to stop the bottle in the notch 13 by the cooperative action of the feed nut 5 and the spindle 6. 14 and moves away from the needle head 21 and toward the flange 25 in the axial direction. And drive shaft 4 is 300
When rotated from ° to 135 °, flanges 20, 2
5 is the magnet ring 18, 19 of the magnetic coupling 9
At this point, the locking pin 8 is removed from the guide groove 24 of the stopper mechanism 10. The drive shaft 4 continues to rotate further, in which case the magnetic coupling 9 is connected so that the revolver head 7
rotates from the loading position to the unloading position as shown in FIG.
6 and is carried through the opening 28 to the pneumatic tube 12. The sample collection bottle 14 is then sent to the laboratory by operation of a pneumatic blower (not shown).
Once the drive shaft 4 has been rotated further to 0°, it is stopped and the entire device remains in its rest position. In this case, the notch 13 of the revolver head 7 is placed in a position opening directly downward in FIG. 3, as described above.

[Brief explanation of the drawing]

FIG. 1 is a schematic vertical sectional view showing one embodiment of the device of the present invention at a sample collection position, FIG. 2 is a plan view thereof, FIG. 2a is a plan view of the device of the present invention with the magnetic coupling in a connected state, and FIG. The figure shows a cross-sectional view of the device according to the invention in the loading and unloading position of sample bottles. 1... Installation flange, 2... Installation member, 4...
... Drive shaft, 5 ... Feed nut, 6 ... Spindle, 7 ... Revolver head, 8 ... Locking pin, 9
...Magnetic coupling, 10...Stopper mechanism,
11... Loading tube, 12... Pneumatic tube, 13... Notch, 14... Sample collection bottle, 16... Drive mechanism,
21...needle head, 26...export pipe.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a highly radioactive liquid sample collection device in which a sample collection bottle is conveyed from a loading tube to a collection position of a needle head device and from there to a discharge tube, A counter-rotating drive shaft 4, a spindle 6 screwed into this nut, a revolver head 7 fixed to the end of this spindle and provided with a cutout 13 for accommodating a test sampling bottle 14, and the outer surface of this head. A locking pin 8 cooperates with a stopper mechanism 10 fixed to a stopper mechanism 15 to define the rotation angle and axial travel distance of the revolver head, and a magnetic pin 8 that integrally connects the spindle and the feed nut in the rotatable angular range of the revolver head. A highly radioactive liquid sample collection device characterized by comprising a coupling ring 9. 2 A notch 13 is eccentrically provided on the free end side of the revolver head 7, and the needle head 2
1. The device according to claim 1, characterized in that the device communicates with the utility model registered in claim 1. 3. Utility model registration claim 1, characterized in that the loading tube 11 and the unloading tube 12 are selectively communicated with the notch 13 of the revolver head 7 by rotation of the drive shaft 4 when the magnetic coupling 9 is connected. equipment. 4. The drive shaft 4, the feed nut 5, the spindle 6, the stopper mechanism 10, the revolver head 7, and the needle head 21 connected to the drive mechanism 16 are arranged parallel to the installation member 2 arranged in the horizontal direction. A device according to any one of claims 1 to 3 of the utility model registration claims. 5 Utility model registration claims 1 to 4 characterized in that the drive shaft 4 and the installation flange 1 are inserted into the isolation box 17 in a liquid-tight manner.
Apparatus according to any of paragraphs. 6. Utility model registration claims 1 to 5, characterized in that the magnetic coupling 9 consists of two magnet rings 18 and 19 provided on the flange 25 of the feed nut 5 and the flange 20 of the revolver head 7 The device described in any of the above.