JPH09177750A - Nut for remote control - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate alignment of a bolt to a nut main body by providing positioning plates so cut as to be engaged with bolt holes of a material to be fastened, nut guides supported between the positioning plates and nut main bodies at such a distance as to pinch the material to be fastened, and a handling bar for engaging cutout parts with the bolt holes. SOLUTION: When the equipment is attached to a base plate 8 by nuts 3 and bolts 6, a handling bar 1 is gripped by a manipulator 9, an equipment seat plate 7 and a base plate 8 are so mounted as to be pinched by positioning plates 2 and the nuts 3 while adjusting the position of the handling bar 1 so that the cutouts of the positioning plates 2 may be fitted to the positioning rings 11. After positioning of the positioning plate 2 is completed, the bolts 6 are turned by an impact wrench 10 and fastened with the nuts 6, and fixing of the equipment seat plate 1 and the base plate 8 is completed. Accordingly, positioning of the bolts and the nut main bodies can be facilitated, the nut main bodies can be easily detached, and therefore, safety and workability are improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote operation nut which is used in equipment such as in a nuclear facility and is detachably attached by remote operation.

[0002]

2. Description of the Related Art FIG. 3 is an explanatory view of a conventional nut which is used in equipment such as in a nuclear facility and which is detachably attached by remote control. In the figure, the conventional nut 03 and bolt 06
When attaching the device to the base plate 08 by, the nut 03 is welded to the bottom surface of the base plate 08 in advance, the device seat plate 07 is arranged according to the bolt hole of the base plate 08, and the remote control device is used while monitoring with the TV camera. Then, the bolt 06 is screwed into the nut 03 to be fastened.

[0003]

In the conventional nut as described above, the bolt 06 is tightened when the bolt 06 is fastened.
If seizure occurs between the nut 03 and the bolt 06 when the bolt 06 is attached or detached, such as seizure that occurs when the screw does not fit the center of the nut 03 and the seizure that occurs due to the heat effect during operation. Since the nut 03 is welded to the lower surface of the base plate 08 in the cell where the radioactivity concentration is high, there is a risk of exposure to radiation due to radioactivity in the repair of the nut in the cell by hand.
It cannot be repaired by removing it or hanging the welding.

[0004]

SUMMARY OF THE INVENTION A remote operation nut according to the present invention is intended to solve the above-mentioned problems, and a remote operation nut for screwing a bolt by a remote operation to fasten an object to be fastened is provided. A positioning plate that is cut out so that it can be engaged with the hole entrance for the bolt that is bored in the object, and an object to be fastened is provided between the positioning plate and the nut body, and the two are supported so as to face each other. A nut guide and a handling bar protruding from the nut guide and gripped by a manipulator to engage the notch of the positioning plate with the hole inlet for the bolt are provided. When tightening the object to be fastened with this nut, grasp the handling bar with a manipulator and remotely pinch the object to be fastened between the nut body and the positioning plate. By aligning the notches, the center of the bolt, the center of the nut, and the center of the hole for the bolt are automatically communicated with each other, and the bolt and the nut body can be easily aligned. Further, it is not necessary to weld the nut body to the object to be fastened, and the nut body can be easily removed by removing the bolt.

[0005]

1 and 2 are explanatory views of a nut according to an embodiment of the present invention. In the figure, the nut according to the present embodiment is used for equipment such as in a nuclear facility and is attached and detached by remote control. As shown in the figure, the nut 3 and the bolt 6 are used in the nuclear facility where the equipment is installed. The nut 3 and the positioning plate 2 are attached above and below the nut guide 4 in consideration of the thickness of the base plate 8 and the equipment seat plate 7 of the equipment to be attached. Two sets of the nut guides 4 are attached to the left and right sides of the plate guide 5 according to the pitch of the attachment holes of the base plate 8 and the equipment seat plate 7. The plate guide 5 is provided with a handling bar 1 projecting upward for smooth remote operation. A positioning ring 11 is fixed to the entrance of the mounting hole of the equipment seat plate 7, and a notch that fits to the outer diameter of the positioning ring 11 is provided at the tip of the positioning plate 2. The nut guide 4 is formed such that the nut 3 is arranged on the center line of the notch and that the gap between the positioning plate 2 and the nut 3 in the height direction is supported to be equal to the height of the base plate 8 stacked on the equipment seat plate 7. Has been done. A handling bar 1 is provided at the center of the plate guide 5 so as to be gripped by the manipulator 9. The mutual spacing of the positioning plates 2 attached to both ends of the plate guide 5 matches the spacing of the bolt 6 mounting holes formed in the device seat plate 7. A positioning ring 11 for positioning the nut 3 is fixed to the inlet of the bolt 6 mounting hole of the device seat plate 7 by spot welding.
A head is formed on the bolt 6 so as to be rotated by the impact wrench 10.

When the device is attached to the base plate 8 by the nut 3 and the bolt 6, the handling bar 1 is gripped by the manipulator 9 and conveyed to a position to be attached, as shown in FIG. While the position of the handling bar 1 is adjusted by the manipulator 9 so that the notches of the two fit together, the positioning plate 2 and the nut 3 sandwich the device seat plate 7 and the base plate 8 in the direction shown by the arrow. To do. When the positioning of the positioning plate 2 through the handling bar 1 is completed, the bolt 6 is turned by the impact wrench 10 and fastened with the nut 3 to attach the device seat plate 7
And the fixing of the base plate 8 are completed.

[0007] In a conventional nut that is used in equipment such as in a nuclear facility and is attached and detached by remote control, seizure occurs when the bolt and the nut are not aligned with each other when they are fastened. If seizure occurs between the nut and the bolt when the bolt is removed or attached, such as seizure caused by heat during operation, the nut is welded to the bottom surface of the base plate in the cell where the concentration of radioactivity is high. Since repairing by hand involves the risk of exposure to radiation due to radioactivity, it is not possible to repair such as removing a seized nut or hanging a welded nut. However, in this nut, the thickness of the base plate 8 and the equipment seat plate 7 cannot be adjusted. Length L-shaped nut guide 4
Nut 3 is attached to the lower end of the plate, the upper end of the nut guide 4 is attached to the positioning plate 2 in the same core shape, the nut 3 and the positioning plate 2 are aligned with the mounting holes of the base plate 8 and the device seat plate 7, and the plate guide 5 is attached. Install on both ends of. The plate guide 5 is provided with a handling bar 1 as a handle for remote operation. Bolt 6 of device seat plate 7
The positioning ring 11 is fixed at the entrance of the mounting hole. When the device seat plate 7 is attached to the base plate 8 by remote control using the nut 3 and the bolt 6, the device seat plate 7 and the base plate 8 for fixing the handling bar 1 by remote control via the manipulator 9 are positioned with the nut 3. The center of the bolt 6 and the center of the nut 3 are automatically aligned by aligning the notch of the positioning plate 2 with the positioning ring 11 fixed between the plate 2 and the mounting hole inlet, and the bolt 6 is rotated. The device seat plate 7 is fastened to the base plate 8 by being screwed into the nut 3. Also,
It is possible to remove the nut 3 by remote control,
It is possible to prevent the screw from being caught and prevent seizure, and at the time of seizure, the nut 3 can be easily replaced from outside the cell. In this way, the present nut holds the handling bar 1 by the manipulator 9 and aligns the positioning plate 2 with the positioning ring 11,
The bolt 6 and the nut 3 can be easily aligned with each other. In addition, even if trouble such as seizure between the bolt 6 and the nut 3 occurs, the bolt 6 and the nut 3 are forcibly forced.
The nut 3 can be removed from the base plate 8 and the equipment seat plate 7 by cutting the screw and removing the bolt 6 and the replaceability, safety, workability, etc. are improved. Further, since the work can be performed by remote control, there is no need to perform a large-scale work on site, and the work cost can be reduced.

[0008]

The nut according to the present invention is constructed as described above, and by aligning the notch portion of the positioning plate with the positioning ring, the bolt and the nut body can be easily aligned with each other. Since the nut body can be easily removed by removing the bolt, the safety and workability in the nut fastening work, the nut replacement work, and the like are improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a nut according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of the operation.

FIG. 3 (a) is a perspective view of a conventional nut, and FIG. 3 (b) is a front view thereof.

[Explanation of symbols]

 1 Handling bar 2 Positioning plate 3 Nut body 4 Nut guide 5 Plate guide 6 Bolt 7 Equipment seat plate 8 Base plate 9 Manipulator

Claims (1)

[Claims] 1. A remote control nut for screwing a bolt by remote control to fasten an object to be fastened, wherein a positioning plate cut out so as to be engageable with a hole entrance for the bolt formed in the object to be fastened. A nut guide for supporting an object to be fastened with a gap between the positioning plate and the nut body, the notch portion of the positioning plate protruding from the nut guide and being gripped by a manipulator And a handling bar for engaging the bolt with the hole entrance for the bolt.