JP2002219660A - Thread engagement release confirming mechanism for remote bolt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thread engagement release confirming mechanism for a remote bolt capable of performing the tread engagement release confirmation works of the remote bolt without changing an impact wrench to an dedicated threading engagement release confirmation tool and shortening the working time by the rational works. SOLUTION: A wrench socket 20 fitted to the head part of the remote bolt, rotated by the impact wrench, and rotating the remote bolt is provided with a friction lock mechanism 23 facing to the fitting recess part 21 and comprising a ball plunge 40 pressing and energizing a steel ball 43 in the tip by a spring 42. It is so constituted that the friction force by the pressing allows the wrench socket 20 to support the remote bolt 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote bolt release confirmation mechanism for confirming the release of a remote bolt when the remote bolt is tightened or loosened by remote control means such as a manipulator.

[0002]

2. Description of the Related Art Parts and devices are exchanged in a place where access of workers is restricted, such as a nuclear facility, by remote control using a manipulator.

FIG. 5 shows a conceptual diagram of an example of a part exchanged by such a remote operation. (A) is a plan view,
(B) is a longitudinal sectional view.

[0004] In the illustrated configuration example, a part 1 as a member to be fixed is fastened and fixed to an installation site of a fixing object 2 by a remote bolt 30 irremovably provided on a fixing flange 1A, and the part 1 is replaced. At this time, the remote bolt 30 is loosened by the impact wrench gripped by the manipulator to release the screw engagement with the female screw (nut 2A) at the portion to be fastened.
After the component 1 is removed together with the remote bolt 30 by the manipulator, a new component 1 is located at the installation position, and the remote bolt 30 is tightened and fixed.

As shown in an enlarged sectional view of FIG. 6, the remote bolt 30 has an engagement small diameter portion 32 having a diameter smaller than a diameter of a screw root and having a predetermined length between a head portion 31 and a screw portion 33. The screw part 33 at the tip is screwed and penetrated through the top surface 51 of the cylindrical bolt collar 50 having a top surface of a predetermined height fixed to the fixing flange 1A. As shown in FIG. 5, the screw portion 33 is provided so as not to interfere with the lid portion and drop off even when the head portion 31 is pulled up.

[0006]

By the way, when replacing the fixed member fastened by the remote bolt having the above structure, a plurality of remote bolts are sequentially loosened by an impact wrench gripped by a manipulator and all screws are screwed. At this time, a phenomenon may occur in which the remote bolt that has already been unthreaded is screwed again due to vibration when the other remote bolt is loosened. Attempting to remove the fixed member in such a state may damage the screw portion of the remote bolt and the female screw on the other side, making it impossible to reuse the remote bolt. Therefore, the remote bolt is lifted and screwed. It is necessary to confirm that they have not.

In this screwing release confirmation work, an impact wrench to be gripped by the manipulator is shown in FIG. 7A because the remote bolt is often disposed in a narrow portion that cannot be directly gripped by the manipulator. The tool is replaced with a dedicated tool 70 for confirming the disengagement provided with a hook fork 72 at the tip of the support bar 71, and the hook fork 72 is hooked on the head 31 of the remote bolt 30 as shown in FIG. It is done by that.

However, in the screwing release confirmation work as described above, it is necessary to move the manipulator to a tool storage location, change the impact wrench to a tool for screwing release confirmation, and return it to the working position again. There has been a problem that changing the tool and moving the manipulator involved are troublesome and time-consuming.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a remote bolt screwing release confirmation operation can be performed without changing an impact wrench to a screw release confirmation tool. It is an object of the present invention to provide a remote bolt screwing release confirming mechanism capable of shortening the working time.

[0010]

According to the present invention, there is provided an apparatus for confirming the release of a screw of a remote bolt which achieves the above-mentioned object. In the remote bolt tightening / loosening device, wherein a wrench socket mounted on the remote bolt is fitted to the bolt head of the remote bolt to perform a tightening / loosening operation, a locking member is fitted to the wrench socket by a biasing means. A friction locking mechanism urged toward the mating recess is provided, and the friction locking mechanism presses the locking member against a bolt head fitted in the bolt head fitting recess to press the wrench. The remote bolt may be supported on a socket.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a view conceptually showing an impact wrench 10 and a remote bolt 20 as a rotary operation tool provided with a configuration example of a remote bolt screwing release confirmation mechanism according to the present invention.

The impact wrench 10 has a rotating spindle 12 protruding from a main body 11 having a built-in rotary drive mechanism, and a wrench socket 20 is mounted at the tip of the spindle 12. The main body 11 has a grip 11A.
The grip 11A is gripped by a manipulator (not shown) as operating arm means.

The wrench socket 20 has an impact wrench 1 through an end connecting portion 22 as shown in FIG. 2A which is a longitudinal sectional view thereof and FIG. 2B which is a BB sectional view thereof.
0, which is adapted to be coupled to the spindle 12 and has a cylindrical shape on the other end and a (fittable) bolt head fitting corresponding to the hexagonal head 31 of the remote bolt 30 on one side. A hexagonal column-shaped fitting recess 21 is formed as a recess, and a friction locking mechanism 23 is provided in the fitting recess 21.

As shown in FIG. 2 (C), the friction locking mechanism 23 has a steel ball 43 at the tip end by a spring 42 as a biasing means housed in a cylindrical casing 41.
Ball plunger 40 is formed by pressing steel balls 43 on three adjacent surfaces forming a hexagonal cross section of fitting recess 21 so as to protrude into fitting recess 21, respectively. ing.

Here, the pressing force of the three sets of ball plungers 40 is such that the head 31 of the remote bolt 30 fitted in the fitting recess 21 is moved to the side where the ball plungers 40 arranged on three sides face each other. Part 31 is pressed and urged between the steel ball 43 of the ball plunger 40 and the head 31 and the head 3
It is set so that the remote bolt 30 can be supported by the wrench socket 20 by a frictional force generated between the inner bolt 1 and the inner surface of the fitting recess 21.

In the wrench socket 20 provided with such a friction locking mechanism 23, the remote bolt 30 is supported and lifted through the wrench socket 23 by fitting the head 31 into the fitting recess 21. And when the remote bolt 30 cannot move,
The head 31 comes off from 1 and separates.

By using the wrench socket 20 having the friction locking mechanism 23 as described above when loosening the remote bolt 30, the wrench socket 20 is fitted to the head 31 of the remote bolt 30 as shown in FIG. When the impact wrench is retracted (removed) after being unscrewed by rotating and loosening it with an impact wrench (not shown), the remote bolt 30 supported by the wrench socket 20 also rises accordingly and its screw portion 32 is the top surface 51 of the color 50
Then, the head 31 is dropped off from the wrench socket 20 as a result. In other words, it is possible to confirm that the screwing of the remote bolt 30 has been completely released.

Also, after all of the many remote bolts 30 have been completely unscrewed, the wrench socket 20 is fitted to the head 31 of the remote bolt 30 again, and the remote bolt 30 is lifted by lifting operation. It can be confirmed whether or not the remote bolt 30 is re-engaged by the vibration when the other remote bolt 30 is loosened. If the screw is re-engaged, the impact wrench can be driven to release the screw.

That is, it is possible to perform the unscrewing operation of the remote bolt 30 without holding the impact wrench held by the manipulator with the tool for confirming the unscrewing, and when re-engaging after unscrewing. Can be used as it is, and the unscrewing operation can be performed extremely reasonably in a short time.

Although the friction locking mechanism 23 of the above configuration example is composed of three sets of ball plungers 40, the number of ball plungers 40 is not limited to this and can be changed as appropriate.

Further, the friction locking mechanism is not limited to the ball plunger. For example, as shown in a sectional view in FIG. 4, a leaf spring 60 having one end fixed to the outer surface of the wrench socket 20 may be configured to protrude into the fitting recess 21. In this configuration, the leaf spring 60 doubles as the urging means and the locking member.

[0023]

As described above, according to the mechanism for confirming the uncoupling of a remote bolt of a bolt according to the present invention, the locking member is directed toward the inside of the bolt head fitting recess by the urging means on the wrench socket. A biased friction locking mechanism is provided,
The friction locking mechanism is configured such that the locking member is pressed against the bolt head fitted into the bolt head fitting recess so that the remote bolt can be supported on the wrench socket. Is raised, it can be confirmed that the supported remote bolt has been completely unscrewed because it is also raised accordingly. Also, after all of the remote bolts have been completely unthreaded, the remote bolt is lifted by fitting the wrench socket again to the bolt head of the remote bolt and lifting the remote bolt, so that the remote bolt can be replaced by another remote bolt. It is possible to confirm whether or not the screw has been screwed again by the vibration at the time of loosening, and if it is screwed, the screw can be released by driving the rotary operation tool.

That is, it is possible to perform the operation for confirming the release of the screw of the remote bolt without changing the rotary operation tool gripped by the manipulator to the tool for confirming the release of the screw.
When re-engaged, the unscrewing operation can be performed as it is, and the unscrewing operation and the unscrewing confirmation operation of the remote bolt can be performed in a reasonably short time.

[Brief description of the drawings]

FIG. 1 is a view conceptually showing an impact wrench and a remote bolt as a rotary operation tool having one configuration example of a remote bolt screwing release confirmation mechanism according to the present invention.

2A is a longitudinal sectional view of a wrench socket, FIG. 2B is a sectional view taken along the line BB, and FIG. 2C is a longitudinal sectional view of a ball plunger.

FIG. 3 is an explanatory view of a work of loosening a remote bolt.

FIG. 4 is a longitudinal sectional view of a wrench socket to which a configuration example of a friction locking mechanism is applied.

FIG. 5 is a conceptual diagram showing an example of a part exchanged by remote control.

FIG. 6 is an enlarged sectional view of a remote bolt.

FIG. 7 is an explanatory view of a conventional tool for checking engagement release as a conventional example and a check operation thereof.

[Description of Signs] 10 Impact wrench (rotary operation tool) 20 Wrench socket 21 Fitting concave part (bolt head fitting concave part) 23 Friction locking mechanism 30 Remote bolt 31 Head (bolt head) 40 Ball plunger (Friction locking mechanism) ) 42 Spring (biasing means) 43 Steel ball (locking member)

Continuing on the front page (72) Inventor Tomoki Yamaguchi 1 Kawasaki Harima Heavy Industries Ltd. Yokohama Engineering Center Ishinakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa

Claims (1)

[Claims] A remote bolt provided on a fixed member so as not to fall off is tightened and loosened by fitting a wrench socket mounted on a rotary operating tool gripped by an operating arm means to a bolt head of the remote bolt. In the remote bolt tightening / loosening device, the wrench socket is provided with a friction locking mechanism in which a locking member is urged by an urging means into a bolt head fitting recess. A remote bolt, wherein the friction locking mechanism is configured to press the locking member against a bolt head fitted into the bolt head fitting concave portion to support the remote bolt on the wrench socket. Looseness confirmation mechanism.