JP3081077B2 - Wire wrapping mobile gantry - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire-winding moving gantry in a spacer-wire-type nuclear fuel rod wire winding apparatus.

[0002]

2. Description of the Related Art FIG. 3 is a view showing a configuration of a nuclear fuel rod of a spacer wire type. A large number of uranium or plutonium fuel pellets 3 are loaded in a cladding tube 2 of a nuclear fuel rod 1.
Both sides are sealed by a lower end plug 4 and an upper end plug 5. An end of a wire 6 is welded and fixed to the lower end plug 4, and the wire 6 is wound around the outer circumference of the cladding tube 2 at a predetermined pitch and a predetermined number of windings. As shown in FIG. 3, the upper end plug 5 is bent and sandwiched by the slit groove 7, the slit groove 7 is caulked, and the end of the wire is welded and fixed to the upper end plug 5.

FIG. 5 is a view showing a schematic configuration of a manufacturing apparatus of the above-mentioned spacer wire type nuclear fuel rod. The nuclear fuel rod 1 is mounted on a plurality of nuclear fuel supporting rollers 11 provided on a base 10 so as to be rotatable around its axis. The lower end plug 4 is attached to the nuclear fuel rotation mechanism 12 and the nuclear fuel rotation mechanism 1
2, the nuclear fuel rod 1 is driven to rotate around the axis.

[0004] A wire 6 fixed to the lower end plug 4 of the nuclear fuel rod by welding is extended along the nuclear fuel rod, and its end is wound around a wire drum 13. Wire holding mechanism 15 of wire tension applying mechanism 14
, And a predetermined tension is applied to the wire wound around the nuclear fuel rod.

[0005] On the base 10, a wire wrapping moving base 16 is further disposed so as to be movable in the axial direction of the nuclear fuel rod 1.

However, when winding a wire,
The wire 6 extending along the upper surface of the nuclear fuel rod 1 is pressed and supported on the upper surface of the nuclear fuel rod 1 by the roller 17 of the wire wrapping moving base 16, and the nuclear fuel rotating mechanism 12 moves the nuclear fuel rod 1 around its axis. The wire wrapping movable base 1 is rotated in accordance with the rotation.
6 is moved to the upper end plug 5 side. Thus, nuclear fuel rod 1
The wire 6 is wound around the outer periphery of the nuclear fuel rod 1 at a predetermined pitch and a predetermined number of turns by the rotation of the wire and the movement of the wire winding moving base 16. When the wire is wound by a predetermined number of turns, the wire is bent and caught in the slit groove 7 of the upper end plug 5 as described above, and the wire is cut at a predetermined position while caulking the slit groove 7, Upper end plug 5 at the wire end
The process at the winding end is completed by welding and fixing to the winding end.

[0007]

However, in the end plug welding step before winding the wire, a relative angular deviation between the lower end plug and the upper end plug in the circumferential direction is generally allowed to some extent. By simply rotating the rod around the axis and moving the wire wrapping frame synchronously, the wire axis may not coincide with the upper end plug slit groove core at the winding end. When such a process is performed, there is a problem that the wire cannot be caught in the slit groove or the upper end plug may be significantly damaged.

Further, even if the wire is caught in the slit groove, the above-described bending and sandwiching method may cause incomplete bending of the wire, and may cause a problem such as loosening of the wire or a pitch shift when the pressing member is released. .

Therefore, there is a method of measuring the relative angle shift between the upper end plug and the lower end plug, calculating the data with a computer, and adjusting the angle at the time of winding the wire. There is a problem that the winding device system becomes expensive.

[0010] In view of the above, the present invention prevents damage to the upper end plug, loosening of the wire, and occurrence of pitch deviation and the like.
It is an object of the present invention to provide a wire winding and moving gantry capable of improving the quality, bending a wire in a slit groove without trouble, and achieving complete automation.

[0011]

SUMMARY OF THE INVENTION The present invention relates to a wire winding gantry for winding a wire welded to a lower end plug of a nuclear fuel rod around an outer periphery of the nuclear fuel rod at a predetermined pitch and a predetermined number of turns. A wire bending member movable in a direction perpendicular to the axis of the rod, and bending the wire into a slit groove provided in an upper end plug of the nuclear fuel rod; and a plane perpendicular to the axis of the nuclear fuel rod. And a slit groove detecting device provided at a position deviated by a predetermined angle with respect to the moving direction of the wire bending member, and detecting a slit groove of the upper end plug and a bottom surface thereof.

[0012]

In the wire winding step, the rotation of the nuclear fuel rod is temporarily stopped just before the number of turns of the wire reaches a predetermined number, and then the nuclear fuel rod is moved to a position where the slit groove of the upper end plug is detected by the slit groove detecting device. It is rotated in the forward or reverse direction. When the slit groove is thus detected, the nuclear fuel rod is rotated by the predetermined angle formed by the moving direction of the wire bending member and the slit groove detecting device.

By the rotation of the predetermined angle, the center of the slit groove is aligned with the axis of the wire and the same direction as the moving direction of the wire bending member, and the wire is reliably bent into the slit groove by the movement of the wire bending member. Engaged.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, reference numeral 20 denotes a wire wrapping movable gantry of the present invention. The wire wrapping movable gantry 20 has a roller 21 for horizontally supporting the nuclear fuel rod 1 and a top surface of the nuclear fuel rod 1. Rollers 22 for pressing the arranged wires 6 on the upper surface of the nuclear fuel rod 1 are mounted so as to form a pair.

Further, the above-mentioned wire wrapping movable gantry 2
A wire pressing member 23 having a notch step that can engage with the wire 6 and prevent the wire 6 from moving in the lateral direction is disposed on the upper front surface of the wire pressing member 23 so as to be vertically movable. A wire bending member 24 which can be inserted into and removed from the slit groove 7 of the upper end plug 5 is disposed in front of the upper end plug 5 so as to be movable in a vertical direction perpendicular to the axis of the nuclear fuel rod. The wire bending member 24 has a substantially plate shape, the thickness thereof is substantially the same as the width of the slit groove 7 of the upper end plug, and the rear edge thereof is separated from the bottom surface of the slit groove 7 by the wire diameter. It moves to the position. That is, the rear end of the wire bending member and the bottom surface of the slit groove 7 are separated by the wire diameter.

The nuclear fuel rod 1 supported by the rollers 21
The slit groove 7 of the upper end plug 5 and the bottom surface 7a thereof are located on the left and right sides at positions deviated in the circumferential direction of the nuclear fuel rod by a predetermined angle, for example, 90 ° with respect to the moving direction of the wire bending member 24.
Are provided so as to face each other.

On the other hand, an elevating member 27 having a support 26 for supporting the nuclear fuel rod 1 when the wire press-contact member 23 is lowered is provided at the lower part of the front surface of the wire winding and moving gantry device 20, A pair of left and right swing arms 29a and 29b capable of swinging about a horizontal shaft 28 are mounted on the front surface of the elevating member 27.

At the tip of the swing arms 29a and 29b,
A wire pinching slit caulking mechanism 30 for pressing the upper end plug 5 from both sides and caulking the slit groove 7 is provided, and a wire cutting mechanism 31 is provided above (on the distal end side of) the wire pinching slit caulking mechanism 30. Is provided. A wire holding member 32 for holding the lower end of the bent wire is provided below (at the base end of) the upper wire holding slit caulking mechanism 30.

Thus, the wire 6 whose tip is welded to the lower end plug of the nuclear fuel rod 1 is extended along the upper surface of the nuclear fuel rod 1,
The wire 6 is wound around the outer surface of the nuclear fuel rod 1 by moving the wire wrapping moving gantry 20 in synchronization with the rotation of the nuclear fuel rod 1 while rotating the nuclear fuel rod 1 around its axis.

Therefore, when the position becomes approximately one-quarter of a rotation before the wire winding end, the wire winding moving gantry 20 is temporarily stopped. In this case, the slit groove 7 of the upper end plug is located at a substantially horizontal position as shown in FIG. Here, the nuclear fuel rod 1 is slightly rotated in the forward or reverse direction until the slit groove 7 and the bottom surface 7a thereof are detected by the slit groove detecting device 25, and the origin of the slit groove 7 and the bottom surface 7a is determined. Is done. Thereafter, a predetermined angle between the moving direction of the wire bending member and the slit groove detection device, that is, 90 °
However, the nuclear fuel rod 1 is further rotated in the winding direction.

After the slit groove is once adjusted to the predetermined position and the nuclear fuel rod is rotated by a predetermined angle, the core of the slit groove 7 and the axis of the wire bending member 24 and the axis of the wire 6 are coplanar. There can be. When the rotation of the nuclear fuel rod 1 is stopped in this manner, the wire pressing member 23 is lowered, and the notch step is hooked on the wire 6 and at the same time the rollers 21 and 22 are opened to prevent loosening. Then, the wire pressing member 23 is further lowered, and the wire 6 is pressed against the nuclear fuel rod 1 supported on the support 26 of the lifting member 27 at the rising position at that time, and the tension is maintained.

Next, the wire bending member 24 is lowered, the wire bending member 24 is inserted into the slit groove 7 of the upper end plug 5, and the tension applied to the wire 6 is released. Thus, the wire 6 is bent and inserted into the slit groove 7 by the lower end surface of the wire bending member 24.

Then, the pair of swinging arms 29a and 29b are swung in the direction in which the tips approach, and the wire holding member 3
While the lower end of the wire bent in 2 is clamped,
The slit groove 7 is swaged by the wire sandwiching slit swaging mechanism 30, and the wire 6 is inserted into the slit groove 7 of the upper end plug 5.
Fixed to

Thereafter, the wire 6 protruding from the slit groove 7 is cut to a required size by the wire cutting mechanism 31, and the wire is fixed to the upper end plug by welding to complete a spacer wire type nuclear fuel rod.

[0025]

Since the present invention is constructed as described above, the center groove of the upper end plug slit can be perfectly aligned with the plane including the axis of the wire and the axis of the wire bending member. In this case, it is possible to reliably prevent the trouble at the time of the above and to prevent the upper end plug from being damaged, and to completely prevent the wire from being loosened or the pitch from being shifted after the wire is bent and pinched. Moreover,
Full automation can also be achieved by linking the mechanisms together.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a schematic configuration of a wire wrapping movable gantry of the present invention.

FIG. 2 is an explanatory diagram of an operation state of the present invention.

FIG. 3 is a view showing a structure of a spacer wire type nuclear fuel.

FIG. 4 is a view showing a state in which a wire end is bent and engaged with an upper end plug slit groove.

FIG. 5 is a diagram showing a schematic configuration of a spacer wire winding device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Nuclear fuel rod 4 Lower end plug 5 Upper end plug 6 Wire 7 Slit groove 20 Wire wrapping moving gantry 21, 22 Roller 23 Wire pressing member 24 Wire bending member 25 Slit groove detecting device 30 Wire sandwiching slit crimping mechanism 31 Wire cutting mechanism 32 Wire clamping member

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-190797 (JP, A) JP-A-3-12194 (JP, U) JP-A-4-436 (JP, U) (58) Investigation Field (Int. Cl. ⁷ , DB name) G21C 3/32 G21C 21/00

Claims (4)

(57) [Claims] 1. A wire winding gantry for winding a wire welded to a lower end plug of a nuclear fuel rod around an outer periphery of the nuclear fuel rod at a predetermined pitch and a predetermined number of turns, in a direction perpendicular to an axis of the nuclear fuel rod supported by rollers. A wire bending member for bending and engaging a wire in a slit groove provided in an upper end plug of a nuclear fuel rod; and a moving direction of the wire bending member in a plane orthogonal to an axis of the nuclear fuel rod. And a slit groove detecting device provided at a position deviated by a predetermined angle with respect to the slit and detecting a slit groove of the upper end plug and a bottom surface thereof. 2. A wire pressing member which presses and supports the wire on the outer surface of the nuclear fuel rod or the upper end plug without loosening the wire in a state where the axis of the wire is aligned with the slit groove sensor core. Item 2. A wire wrapping movable gantry according to Item 1. 3. The wire bending member is movable in a direction perpendicular to the axis of the nuclear fuel rod at a position apart from a slit groove bottom by a required wire diameter, and has a thickness substantially equal to the slit groove width of the upper end plug. The mobile gantry according to claim 1, further comprising: 4. A slit caulking mechanism which is movable in a direction approaching or separating from each other in a direction perpendicular to the axis of the nuclear fuel rod.
The wire wrapping movable gantry according to any one of the above.