JPH0196596A - Attaching/detaching device - Google Patents

Abstract

PURPOSE:To simplify mechanism by a collet part provided in the upper part of a lower shielding plug, an engaging part, an engaging part provided to a fuel assembly so as to engage with the collet part, a band for tightening the collet part of the shielding plug, etc., to the title device. CONSTITUTION:The collet part 2 which is notched in the cylindrical part to a rectangular strip shape and can be tightened by small force is provided on the upper part of the lower shielding plug 1. A fuel assembly 4 and the plug 1 are connected when the engaging part 3 of a projecting shape formed to the top end of the collet part 2 and the engaging part 5 of a recessed shape formed to the bottom end of the assembly 4 are engaged with other. On the other hand, the disconnection of the assembly 4 and the plug 1 which are engaged with each other is executed by tightening the band 6 enclosing the collet part 2 of the plug 1 to tighten the collet part 2 and to disengage the engaging parts. The simplification of the construction, etc., are thereby attained.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention provides an attachment/detachment device that connects and engages a holding body and a held body and at the same time allows the connection and engagement to be easily released as necessary. More specifically, the present invention relates to an effective attachment/detachment device for a fuel assembly of an atomic couplant and a lower shielding plug connected to the lower part of the fuel assembly.

(Prior Art) An attachment/detachment device that connects and engages a holding body and a held body and at the same time releases the connection and engagement as necessary,
Used in various fields.

Since the above-mentioned attachment/detachment device is also provided in the fuel assembly of the atomic couplant described below, the attachment/detachment device of the fuel assembly of the atomic couplant will be described as an example of a known attachment/detachment device.

The lower part of the fuel assembly of the pressure tube atomic coupler is shielded by a lower shielding plug. After the fuel assembly to which the lower shielding plug is connected is pulled out from the core by a fuel exchanger, the fuel exchanger is connected to the transformer 7T port,
After holding the fuel assembly, the fuel assembly and lower shielding plug are separated.

A conventional structure for attaching and detaching the connecting portion between the fuel assembly and the lower shielding plug is shown in FIG.

The disconnection operation of the attachment/detachment device shown in FIG. 8 is performed by squeezing the cholera g2 of the lower shielding plug 1 by a throttle mechanism (not shown), thereby separating the engaging portion 3 of the lower shielding plug 1 and the engaging portion 4 of the fuel assembly. I had released the engagement.

(Problems to be Solved by the Invention) However, the conventional aperture mechanism described above has a complicated structure, consisting of a shilling, a link that converts the force of the shilling into a force in the aperture direction, a rotating ring, an arm, etc. There were difficulties in terms of installation space, cost, maintenance and inspection, etc.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a device for attaching and detaching a holding body and a held object, which has a simple structure, is low in cost, and is easy to maintain and inspect, by improving the drawbacks of the conventionally known attaching and detaching structures.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides an attachment/detachment device for a fuel assembly and a lower shielding plug connected to the lower part of the fuel assembly. an engaging portion provided on the collet portion; an engaging portion provided on the fuel assembly so as to engage with the engaging portion of the collet portion; and a collet portion of the lower shielding plug. and a band that surrounds and tightens the collet part.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

Referring to Figure t51, a collet part 2, which is formed by cutting out a cylindrical part in a rectangular shape, is provided on the upper part of the lower shielding plug 1, which is a member to be held, and which can be inserted with a small force. However, the collet portion does not necessarily have to be shaped like a strip. A convex engaging portion 3 formed at the upper end of the collet portion 2 and a concave engaging portion 5 formed at the lower end of the fuel assembly 4 serving as a holder.
are engaged to connect the fuel assembly 2 and the lower shielding plug 1.

On the other hand, the connected fuel assembly 2 and lower shielding plug 1 are separated from each other by tightening the band surrounding the collet part 2 of the lower shielding plug 1 to squeeze the collet part 2 and release the engagement.

A specific example of an aperture mechanism using this band will be described below. This throttling mechanism is provided at the transformer 7 abort or at the fuel exchange station.

From Figure 2? Up to FIG. tS4, an arm 7 for positioning the center of the band 6 surrounding the collet portion 2 is shown.

In the embodiment shown in FIG. 2, one end of a tape-shaped band 6 is fixed to the tip of an arm 7, surrounds the collet part 2, and the other end is attached to the arm 7 via a roller 8 provided on the arm 7. It is fixed to a winding shaft 9 provided. Since the band 6 and arm 7 are separated from the collet part 2 before tightening, the lower shielding plug 1 (see FIG. 1) can freely move up and down without being hindered by the band 6. The arm 7 is linearly moved by a drive mechanism (not shown) and pushed toward the collet part 2, which is tightened by the band 6 and has a smaller diameter, and is positioned so that the center of the band 6 coincides with the center of the collet 2. Tighten the entire collet 2 so that its diameter is reduced. As a result, the collet 2 is tightened evenly over the entire circumference, and the engagement is completely released. Note that 10 is a transformer 7 apo.

The embodiment shown in this tpJ2 diagram operates as follows.

By winding up the winding shaft 9, the band 6 is tightened and the collet part 2 is squeezed, and the arm 7 is pushed toward the collet part 2, which has become smaller in diameter, to position the center of the band 6 and tighten the entire collet 2. , completely disengage.

When the winding shaft 9 is returned to its original position, the band 6 expands due to its spring properties.
Release the collet part 2. At this time, the arm 7 is moved away from the collet section 7.

In the above embodiment, if a scale is provided on the band 6 or a rotary encoder is attached to the winding shaft 9, the winding length of the band can be measured, so that disengagement of the collet 2 can be detected. This improves operability.

Next, in the embodiment shown in FIG. 3, the band 6 is tightened by pulling it with a shilling (not shown) or the like. Positioning the center of the band 6 by extending and contracting the arm 7 is the same as in the embodiment shown in FIG. In this case as well, disengagement can be detected by putting a scale on the band 6.

Furthermore, in the embodiment shown in FIG. 4, tooth grooves are machined in the band 6, and the band 6 is pulled by meshing the worm gear 11 with the tooth grooves. In this case as well, disengagement can be detected by attaching a rotary encoder to the rotating shaft 12 of the ohmic gear 11.

The embodiment shown in FIG. 5 has a structure that does not require an arm for center positioning, and the ms diagram (a) shows the open state and FIG. 5 (b) shows the closed state.

In this embodiment, one end of a tape-shaped or wire-shaped band 6 is fixed to the transformer 7T boat 10 at a fulcrum 6B, and the other end is opened and closed by pulling or loosening at a fulcrum 6C. The band 6 may be pulled not only at one end but also at both ends. In this case, since the above-mentioned arm is omitted, in order to align the center of the band 6 with the center of the collet, the positions of the tension supports 6B and 6c of the band 6 are determined as follows. That is, as shown in (B) of the figure, the line connecting the tension supports 6B and 6C (or the straight line portion 6A of the band 6 in the figure) is at the outer periphery tangent position of the collet (tightened state L''), or even more than that. It must be positioned on the inside.

By doing this, the center of the band coincides with the center of the collet.

The embodiment shown in Fig. Pt56 is a method of tightening or loosening the band by driving only the arm 7. Fig. 6 (a) shows the open state, and Fig. 6 (b) shows the closed state. It shows.

Two rollers 13 are fixed to the transformer 77 port 10, two rollers 14 are attached to the outside thereof, and one roller 15 is attached to the center.
is provided on the arm 7, and the band 6 is hung on the rollers 13, 14, 15 in a zigzag manner. When the arm 7 is pushed toward the collet part, the outer periphery of the collet and the rollers 14 and 15 form a small circle that forms the outer periphery of the collet (in a tightened state), and the band 6 is restricted to this small circular shape. be done. In this embodiment, the opening and closing can be performed only by operating the arm 7, which simplifies the operation, reduces the number of parts, and improves reliability.

FIG. 7 shows a method of tightening with a band according to the present invention, in which the entire device is made into a unit to facilitate repair and replacement.

As shown in the figure, a casing 16 holding a band 6 and an arm 7 is attached to a 7
The structure is such that it is attached to the lunge 17 and connected to a transformer 7T boat or fuel exchanger. As a result, the entire unit can be replaced, and maintenance and inspection time can be significantly reduced.

The present invention is applicable not only to the above-described device for attaching and detaching fuel assemblies for nuclear reactors, but also to devices for lifting and lowering equipment using cranes for industrial machinery.

(Effects of the Invention) In the present invention, the collet part that connects the fuel assembly and the lower shielding plug is squeezed and separated by a band, so the structure is simplified, the cost is low, the reliability of the equipment is high, and maintenance and inspection is possible. This has the effect of making it easier.

[Brief explanation of the drawing]

Figure @i is a longitudinal sectional view of an embodiment of the present invention. FIG. 2 is a plan view of another embodiment of the present invention. Figure i3 is a plan view of another embodiment of the present invention. FIG. 4 is a plan view of another embodiment of the present invention. FIG. 5(a) is a plan view of another embodiment of the present invention in an open state;
FIG. 5(b) is a plan view of the closed state. FIG. 6(a) is a plan view of another embodiment of the present invention in an open state;
FIG. 6(b) is a plan view of the closed state. FIG. 7 is a plan view of another embodiment of the present invention. FIG. 8 is a longitudinal sectional view of the prior art. 1: Lower shielding plug 2: Collet part 3: Engagement part 34: Fuel assembly 5: Engagement part 6: Band
7: Arm 8: Fixed roller 9: Winding shaft 11: Worm gear 13.14.15: Roller agent Patent attorney Mibe Tsuji (1 person) Figure 1 IS Figure 6 (A) (
b) Figure 7 Figure 8

Claims (1)

[Claims] In an attachment/detachment device for a holding body and a held object connected to a lower part of the holding body, a collet part provided on an upper part of the held body, an engaging part provided on the collet part, and an engaging part of the collet part are provided. an engaging part provided on the holding body to engage with the joint part;
An attachment/detachment device comprising: a band surrounding the collet portion of the held body and tightening the collet portion.