JPS593719B2 - sodium fluoroscope - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sodium fluoroscopy system, and particularly to a type that uses a fuel exchanger hold-down arm to observe the top of a fuel assembly. This is a sodium fluoroscopy device that has a mechanism that performs back and forth stroke operations.

The interior of fast breeder reactors, especially those that use liquid metal as a coolant, cannot be directly observed with the naked eye.

For this reason, in fast breeder reactors, a transducer that transmits and receives ultrasonic waves is moved above the fuel assemblies, and a sodium fluoroscopy device is used to observe the top of each fuel assembly to check for abnormalities. Due to fabrication and installation errors in the sodium fluoroscope shielding plug installed in the hold town arm of a single-rotation fixed arm type fuel exchanger, the hold town arm of the fuel exchanger, etc., the fuel assembly tilts with respect to the top of the fuel assembly. In addition to this, the top of the fuel assembly also tilts due to swelling and the like. Due to these inclinations, the relative permissible inclination between the ultrasonic wave emitting surface of the transducer and the top of the fuel assembly is exceeded, and reflected waves cannot be captured and observation cannot be performed. In particular, in a sodium fluoroscopy system, the beam is narrowed down to increase resolution, so if the tilt exceeds the allowable tilt amount, it is necessary to adjust the tilt to an appropriate tilt. Conventional sodium fluoroscopic equipment has a structure in which the scanning guide is used directly as a guide for the back and forth stroke movement of the transducer holder, so in order to adjust the inclination of the transducer, the entire scanning guide must be tilted, or the transducer holder must be tilted. There is a method of directly tilting it, but it is difficult to implement because it has the following disadvantage 5.

In the former case, the scanning guide is an element of the folding mechanism when inserted into and withdrawn from the furnace, and must be rigidly connected to the sodium fluoroscope body and the folding arm with pin bearings to prevent sideways movement. However, it is extremely difficult to create a flexible structure that allows for tilting and rotating operations. In addition, in the latter case, when the transducer holder is stroked back and forth, the tilt adjustment mechanism must also be stroked, but the operation that combines linear motion and tilting motion is complicated, and Driving inside the device may cause malfunctions and is unfavorable in terms of reliability. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to eliminate the above-mentioned drawbacks and to provide a sodium fluoroscopy device having a transducer tilt adjustment mechanism that does not cause problems due to the back and forth stroke motion of the transducer holder and the folding motion of the arm. be. In other words, the present invention includes a housing vertically installed so as to be freely rotatable in the horizontal direction, a scanning guide provided at the bottom of the housing so as to be rotatable around the mounting shaft, and a scanning guide installed vertically along the axial direction of the housing. a driven pulling shaft;
A folding arm connects the lower part of the pulling shaft and the scanning guide via a rotating shaft, and a folding arm is provided to be rotatable relative to the scanning guide about an axis along the longitudinal direction of the scanning guide. a retainer guide; a link mechanism having one end connected to a point spaced apart from the rotation axis of the retainer guide and having the other end driven vertically along the axial direction of the housing; This is a sodium fluoroscopy device comprising a drive section that is provided to drive a link mechanism and a pulling shaft, and a plurality of transducers attached to the lower surface of a cage guide.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall schematic diagram of the present sodium fluoroscope, and FIG. 2 is an enlarged view of the folding mechanism, the longitudinal stroke movement mechanism, and the tilt adjustment mechanism. FIG. 3 is a detailed view of the tilt adjustment mechanism section. These figures all show the folding mechanism in its open or used condition. As shown in these figures, the drive section 10 of the fluoroscope is provided on the shield plug 2. Also, a scanning guide 11, a folding arm 12, a pulling shaft 13
} and a rotating housing 14. Inside the scanning guide 11 of the folding mechanism, a transducer holder guide 15 is provided with a pin so that the transducer holder guide 15 can rotate and vibrate about an axis along the longitudinal direction of the scanning guide. It is attached via a bearing 21. Further, inside this transducer retainer guide 15, a transducer retainer 16 is formed in an L-shape via rollers 22 so as to be able to perform back and forth stroke motion along the longitudinal axis of this transducer retainer guide. held on rails. Further, a rotating shaft 23 provided along the longitudinal direction and driven to rotate is housed in the rotating housing 14, and a side surface of a cam 24 fixed to the lower end of the rotating shaft 23 is attached to the transducer retainer 16. By pressing the side surface of the transducer holder, the transducer holder can be stroked in the front and rear direction. On the other hand, a link mechanism 17 is provided along the inside of the folding arm 12 and the lifting shaft 13, and the bent portion of this link mechanism, that is, the length between the nodes is the same as that of the folding arm and the lifting shaft. By doing so, the link mechanism can smoothly follow the folding operation. This link mechanism 17 is connected to the folding arm 12 by a pin bearing 18, and rotates about this bearing as a fulcrum by pushing and pulling the link part along the pulling shaft 13 in the vertical direction from the upper driving part. It is now able to function. This pin bearing 18
is located closer to the transducer than the center of the folding arm 12, and the stroke width of the drive section is reduced and transmitted to the lower end of the link mechanism. Furthermore, the lower end of the link mechanism and the transducer holder guide 15 are connected by a link. Tilt operation link 1 of this link
The node on the 7 side is the folding arm 12 and the scanning guide 11.
It is an elongated hole-shaped pin bearing located at the same position as the node. The nodes on the side of the transducer retainer guide 15 are provided in the same direction as the tilted center pin bearing 21 of the transducer retainer guide 15 . Transducer 1
9 is attached to the lower surface of the transducer holder 16. Next, the operation will be explained.

To adjust the tilt angle of the transducer 19, first push and pull the dilink part of the tilt operation link mechanism 17 along the pulling shaft 13 in the vertical direction, and the link mechanism 17 rotates about the pin bearing 18. and move the link tip up and down. This tip is further connected to the transducer holder guide 15 by a link, so that the transducer holder guide 15 swings and rotates about the tilt center pin bearing 21 . If the transducer holder guide 15 is tilted, the transducer holder 16 held inside it will also be tilted, and the transducer 19 attached inside it will also be tilted. Thus, by operating the tilt operation linkage 17, the tilt of the transducer 19 can be adjusted. Incidentally, tilt operation link mechanism 1
Since the pin bearing 18 which is the operating fulcrum of 7 is provided closer to the transducer retainer guide 15 than the center, the operation of the operating section is reduced and the transducer retainer guide 1
5 and can make fine adjustments. When performing the back and forth stroke motion of the transducer retainer 16,
Since the transducer holder 16 moves independently within the transducer holder guide 15 without being constrained, it does not have any adverse effect on the tilt adjustment mechanism. Furthermore, when performing an arm folding operation, the distance between the nodes of the folding mechanism and the distance between the nodes of the tilt adjustment mechanism are equal, so the arm folds in a state with no tilt, that is, at a position where the nodes of both mechanisms overlap. If the folding operation is performed, no problem will occur. As described above, the sodium fluoroscopy apparatus of the present invention can provide a sodium fluoroscopy apparatus having a transducer tilt adjustment mechanism that does not interfere with the forward/backward stroke operation and the folding operation.

This ensures that even if the relative inclination between the transducer and the top of the fuel assembly exceeds the allowable value due to inclination due to reactor structure fabrication, installation tolerances, and inclination due to swelling of the fuel assembly, the transducer inclination is Observations can be made by adjusting the . By being able to adjust the inclination, it is possible to reduce the precision required for manufacturing and installing the mechanism of the sodium fluoroscopy device, and the transducer can be accurately directed to the surface to be observed, thereby improving precision. In addition, the tilt adjustment mechanism of this sodium fluoroscopy station uses parts that have a long history of use in sodium.
This mechanism has few failures because it uses a simple operating principle.

[Brief explanation of the drawing]

FIG. 1 is an overall schematic diagram showing one embodiment of the sodium fluoroscopy device of the present invention, FIG. 2 is an explanatory diagram of the inclination adjustment mechanism section of FIG. 1, and FIG. 3 is a partial detailed diagram of FIG. 2. a is a front view, b
is a side view. 11... Scanning guide, 12... Folding arm, 13... Pulling shaft, 14...
・Housing, 15...Transducer retainer guide, 16...Transducer retainer,
17...Link mechanism, 19...Transducer.

Claims (1)

[Claims] 1. A housing vertically installed so as to be rotatable in the horizontal direction, a scanning guide provided at the bottom of the housing so as to be rotatable around the mounting shaft, and a scanning guide driven vertically along the axial direction of the housing. a folding arm that connects a lower part of the pulling shaft and a scanning guide via a rotation shaft; and a folding arm that is rotatable relative to the scanning guide about an axis along the longitudinal direction of the scanning guide. a retainer guide provided; a link mechanism having one end connected to a point spaced apart from the rotational axis of the retainer guide and having the other end driven in the vertical direction along the axial direction of the housing; A sodium fluoroscopy device comprising: a drive section provided above to drive a link mechanism and a pulling shaft; and a plurality of transducers attached to the lower surface of a retainer guide.