JPS606363A - Clamping device for bolt - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Conventionally, a single-tightening type hydraulic torque wrench was used to tighten and loosen bolts that fasten the primary side manhole cover of a steam generator in a nuclear power plant. However, since these tools were held and operated manually, the work took a long time, there was a risk of radiation exposure, and there were problems in that bolt tightening accuracy could not be ensured. Ta.

In order to address the above problems, the present invention includes: a rotary joint that is detachably attached to a telescopic rod of a manhole cover handling device, etc.; a holder that is detachably attached to a cushion cylinder of the rotary joint; A bolt fastening device characterized by comprising a pair of sockets pivoted diagonally on a holder and a hydraulic rotary torque wrench for rotating the sockets, the purpose of which is to tighten bolts. Tightening and loosening work saves labor, reduces manual labor,
The aim is to improve bolt tightening accuracy, reduce radiation exposure, and contribute to safety.

Hereinafter, the present invention will be specifically described with reference to an embodiment shown in the drawings.

(1) is the primary side manhole cover of the steam generator, (2) is the bolt that fastens the manhole cover (1), (10) is the torque wrench body, and Shin holds and transports the manhole cover (1). Manhole cover handling equipment for use, equipped with hydraulic pump unit. The torque wrench body (10) includes a holder (3) that is detachably attached to the cushion cylinder (1, 2) of the rotary joint all, and this holder (3).
A pair of sockets (5) pivoted by pins (4) on the diagonal of It consists of a hydraulic rotary torque wrench (8) interposed between the

This torque wrench main body aO) is installed by removing the cover holder (not shown) provided on the rod that extends and retracts from the cylinder 12 of the manhole cover handling device, and fixing the rotary joint α in its place. It will be done. The rotary joint (11) can rotate 660 degrees around the axis α9 by supplying and discharging pressure oil from the pressure oil pipe αQO barrel. In addition, the rotary join H1l is connected to the hydraulic pump unit (to) via the pressure oil piping α and the hydraulic rotary torque wrench (8) and the pressure oil piping ae.
a4). cushion cylinder a
2 can be raised and lowered by approximately 40 m along the axis a9, and
It is possible to tilt 0 to 2 degrees with respect to the axis αω, and the socket
) and the bolt (2) are easily fitted together.

Therefore, in order to tighten the bolts, first operate the manhole cover handling device holder to tighten the manhole cover (1).
Align axis a9 with the center of Next, the knob (17)
Hold the cushion box az and pull it as shown by the broken line to push down the cushion box az against the spring αe inside it, rotate the rotary joint (11) around the axis aω, and tighten the socket (5) and bolt (2). After matching, turn knob α
When η is released, the socket (5) moves forward from the trap due to the extension of the spring αe and is fitted into the bolt (2).

After that, adjust the pressure to a predetermined pressure using the hydraulic pressure adjustment lever of the hydraulic pump unit (to) while monitoring the torque meter, and operate the drive control lever to supply pressure oil to the pressure oil piping α3)Q3) and the rotary joint. Inlet (11), supply and discharge the hydraulic rotary torque wrench (8) through the pressure oil pipe a Tsukuda (a), and fasten the two diagonal bolts (2) at once.Next, pull the knob handle. Cushion box (12
+ by pulling down against spring α0, the socket (
5) from the bolt (2), rotate the rotary joint (II) slightly around the axis α9, and then remove the bolt (2) adjacent to the bolt (2) to which the socket (5) was fastened.
, and then repeat the above operation.

When loosening the fastened bolt (2), by replacing the ratchet I, the socket (5) can be rotated in the opposite direction to that described above. Thus, by using the above-mentioned device, two bolts can be tightened or loosened at once with high accuracy without manual intervention. Further, since the torque wrench body aG is removably attached to the cushion cylinder a2 of the rotary joint aυ, it is lightweight and compact, making it convenient to attach and detach and carry.

Therefore, by using the device of the present invention, the work that was conventionally done by five workers can now be done by two people, reducing the working time to about a fraction and reducing the radiation exposure to about 1/fo. This makes it possible to improve bolt tightening accuracy.

[Brief explanation of the drawing]

1 and 2 show one embodiment of the present invention, FIG. 1 being a schematic plan view of the torque wrench main body, and FIG. 2 being a schematic front view showing the overall configuration. Manhole cover handling equipment...Kan, rod...(Company),
Rotary joint...(111, Cushion cylinder...αri, Holder...(3), Socket...(
5) Hydraulic one-turn torque wrench... (8) Sub-agent Patent attorney Shigefumi Okamoto and 3 others

Claims (1)

[Claims] A rotary joint that is detachably attached to a telescopic rod of a manhole cover handling device, etc., a holder that is detachably attached to a cushion cylinder of the rotary joint, and a pair of sockets pivoted diagonally on the holder. and a hydraulic rotary torque wrench for rotating the socket.