JPH018265Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a mechanism for a nut runner to follow a bolt, and more specifically, when a cylindrical container with an open top is sealed with a canopy equipped with a tightening band, This invention relates to a nut runner following mechanism for smoothly making a nut runner follow an inserted tightening bolt.

B. Prior Art Various types of nut runners are used for the purpose of transmitting tightening torque to threaded tightening members such as bolts and nuts. These nut runners generally rotate the engagement part between a torque generating mechanism such as a motor and a threaded tightening member connected to the output shaft of the torque generating mechanism, that is, a socket, and lock the threaded tightening member into a predetermined position. It is configured to be able to transmit a tightening torque of .

On the other hand, in nuclear facilities such as nuclear power plants,
Containers such as drums equipped with canopies and canopy tightening bands are used to tightly store the radioactive waste generated within the facility.After solidifying the filled radioactive waste, these containers are The canopy and its tightening band can be fixed to the upper opening of the container by tightening a tightening bolt that is previously attached to the canopy tightening band. Therefore, the filling, solidification, and sealing work of radioactive waste inside nuclear facilities is usually carried out in order to prevent radioactive contamination outside the system.
It is carried out by remote control in contaminated or semi-contaminated areas, the so-called Red Zone or Cobalt Zone. Therefore, if the magnitude of the tightening torque to be transmitted to the tightening bolts is not strictly controlled, accidents such as radioactivity leakage due to breakage of the tightening bolts or incomplete fitting of the canopy may occur. be. Further, as shown in FIG. 4, the canopy tightening band 3 has an open end 1 through which the canopy tightening bolt 2 is inserted, so that its diameter decreases as the tightening state progresses, and the bolt moves horizontally towards the center of the canopy 4, and also slightly moves up and down in the vertical direction. Therefore, if the nut runner, especially its socket, is not made to accurately follow the bolt while transmitting the tightening torque, the ability of the nut runner to transmit the tightening torque will be hindered. In this case, there are almost no conventional nut runners that are equipped with a mechanism that can transmit tightening torque while the socket follows the tightening bolt, and it is difficult to find a mechanism that can transmit tightening torque with the socket following the tightening bolt. Many obstacles were identified in carrying out sealing operations remotely.

B. Purpose of the invention The main purpose of the invention is to
In particular, the object of the present invention is to provide a nut runner used in working environments such as nuclear facilities that require remote control with a mechanism for following bolts.

Another main object of the present invention is to provide a bolt-following function of a nut runner that is suitable for remote control and has excellent operational reliability.

C. Structure of the invention The present invention is a nut runner that tightens and seals a canopy on the top open end of a cylindrical container such as a drum can with a canopy tightening band with a tangential tightening bolt. A capping head placed on the top opening end, and a capping head mounted on the capping head by a fluid cylinder mechanism so as to be able to be moved horizontally by pressing toward the center of the canopy, and the pressing force of the fluid cylinder mechanism being released. and further includes a first spring member that enables horizontal displacement toward the center of the canopy when the pressing force is released, and presses a bolt inserted through the open end of the canopy tightening band toward the center of the canopy. a V-shaped pressing member,
The capping head is attached to the capping head via a second spring member so as to be displaceable in the vertical direction, and
is supported so as to be horizontally movable in the direction of the center of the canopy together with the V-shaped pressing member via a spring member;
Furthermore, the nut runner is movable toward and away from the outer periphery of the canopy on an axis parallel to the tangential direction, and has a pair of sockets that can be rotated about the axis.

D. Embodiment FIG. 1 is a partially cutaway front view of a direct-acting cylinder mechanism, and FIG. 2 is a partially cutaway side view of the fluid cylinder mechanism. FIG. 3 is a front view of the nut runner connected to the capping head. In these drawings, a capping head A floatingly supported on a running rail (not shown) has a straight line for attaching a canopy 4 and a canopy tightening band 3 to a drum can C placed in a reed zone. dynamic cylinder mechanism
P ₂ as well as a fluid cylinder mechanism, for example an air cylinder mechanism P ₁ are incorporated. The air cylinder mechanism P ₁ includes a V-shaped pressing member 5 for pressing the canopy tightening band 3, into which the canopy tightening bolt 2 is inserted into the open end 1, toward the center of the canopy 4. is mounted so that it can move freely in the horizontal direction. These air cylinder mechanism P ₁ and direct-acting cylinder mechanism P ₂ are integrally connected to the capping head A as shown in FIG. 3, and are connected to the capping head _A. In this case, bolt 2 for tightening the canopy is in socket 9 of nut runner N.
After the air cylinder mechanism P1 has fitted the bolt 2 into the bolt ₂ , a pressing force releasing means 6 for releasing the pressing force applied to the bolt 2 in the center direction of the canopy 4; A first spring member 7 is provided which allows the socket 9 to be displaced in the horizontal direction when actuated. As the pressing force release means 6,
For example, the compressed air introduced into the air cylinder mechanism _P1 is released into the atmosphere, and the V-shaped pressing member 5
The exhaust valve 6 can be raised to release the pressing state of the bolt 2 toward the center of the canopy 4. In the embodiment illustrated in FIG. 2, the first spring member 7 supports the V-shaped pressing member 5 so as to be horizontally movable toward the center of the canopy 4 with respect to the air cylinder mechanism _P1 . It is shown as a coil spring attached to support bracket 10. On the other hand, in the linear motion cylinder mechanism _P2 , two rods 11 for suspending and supporting the capping head A with respect to the linear motion cylinder mechanism _P2 are symmetrical about the axis of the capping head. The rods 11 are each fitted with a coil spring as the second spring member 8.
At the beginning of the process of fitting the canopy 4, when the capping head A descends onto the drum C while holding the canopy 4 and the canopy tightening band 3 _, the capping head A stops with the canopy 4 and the canopy tightening band 3 engaged with the upper opening of the drum C, and with a slight downward stroke remaining, and the canopy tightening bolt 2. The nut 2' is positioned on the same axis as the insertion hole of the socket 9. In this state, the bolt 2
The head of the nut 2' and its nut 2' are fitted into the socket 9, and are rotated in a direction to increase the tightening margin by activation of the nut runner N. canopy 4 due to the tightening torque transmitted to the bolt 2 and nut 2';
As the fitted state of the canopy tightening band 3 progresses, the diameter of the canopy tightening band 3 decreases (indicated by a two-dot chain line in Fig. 4), and the canopy tightening band 3 is inserted into the open end 1 of the canopy tightening band. The bolts 2 and nuts 2' for tightening the canopy are displaced in the horizontal and vertical directions. In the device of the present invention, in order to always align the axes of the bolt 2 and nut 2' with the axis of the socket 9, when the head of the bolt 2 and the nut 2' are inserted into the socket 9 of the nut runner N, The exhaust valve 6 is opened to release the V-shaped pressing member 5 from pressing the bolt 2 toward the center of the canopy, giving the socket 9 a degree of freedom in horizontal movement, and at the same time, the second spring member 8, the capping head A is made vertically displaceable, giving the socket 9 a degree of freedom in vertical movement corresponding to the surplus of the downward stroke. In this way, the socket 9 of the nut runner N follows the canopy tightening bolt 2 and the nut 2' to maintain a concentric position despite the increase in the tightening allowance given to the canopy tightening band 3. can do. In addition, as shown in FIG. 3, the nut runner N has a fluid cylinder A ₁ ,
_A2 , the sockets 9, 9' are configured to be able to approach and separate from the bolts 2 and nuts 2' inserted into the open end 1 of the canopy tightening band 3 from the left and right,
Moreover, the first spring member 7 allows translation in the direction of the center of the canopy 4, and the tightening axes of the sockets 9, 9' are parallel to the tangent to the outer circumference of the canopy 4. Further, the sockets 9, 9' can be expanded and contracted in the axial direction by springs S, S', so that tightening can be carried out smoothly.

E. Effects of the Invention As is clear from the above explanation, by employing the device of the present invention, the socket of the nut runner can be made to accurately follow changes in the position of the bolt inserted through the canopy tightening band. Therefore, the bolt tightening operation can be performed accurately and smoothly even when sealing the drum opening by remote control in a reed zone of a nuclear facility. Therefore, the device of the present invention can significantly improve the prevention of radioactive contamination caused by poor fitting of the canopy.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of the direct-acting cylinder mechanism, and FIG. 2 is a partially cutaway side view of the fluid cylinder mechanism. 3 is a front view of a nut runner connected to the capping head, and FIG. 4 is an explanatory view of a canopy tightening band formed by inserting a canopy tightening bolt into the open end. 1... Opening end of canopy tightening band, 2... Canopy tightening bolt, 3... Canopy tightening band, 4... Canopy, 5... V-shaped pressing member, C... Cylindrical container,
P ₂ ... Direct acting cylinder mechanism, A ... Capping head, N ... Nut runner, P ₁ ... Fluid cylinder mechanism, 9 ... Socket, 6 ... Pressing force release means, 7 ... First spring Member 8... Second spring member.

Claims (1)

[Scope of Claim for Utility Model Registration] A nut runner that tightens and seals a canopy at the top open end of a cylindrical container such as a drum with a canopy tightening band with a tangential tightening bolt; a capping head placed on the top opening end; a capping head mounted on the capping head by a fluid cylinder mechanism so as to be movable horizontally in the direction of the center of the canopy; and further includes a first spring member that enables horizontal displacement toward the center of the canopy when the pressing force is released, and presses a bolt inserted through the open end of the canopy tightening band toward the center of the canopy. a V-shaped pressing member that is attached to the capping head via a second spring member so as to be vertically displaceable; A nut runner having a pair of sockets supported so as to be horizontally movable in the direction of the center of the canopy, movable toward and away from each other on an axis tangentially parallel to the outer periphery of the canopy, and rotatably driven around the axis. A nut runner bolt tracking mechanism characterized by comprising: