JPH09295230A - Attaching/detaching device of large nut - Google Patents

Abstract

PROBLEM TO BE SOLVED: To safely and easily perform the attaching/detaching work of a large special nut of heavy weight. SOLUTION: An elevatable frame 9 is elevatably provided on a main frame 5 of a truck 2 capable of moving on a floor surface F. A turn table 11 is provided on the elevatable frame 9 in a horizontally turnable manner, and a nut N is loaded thereon and turned. The elevatable frame 9 is elevated/lowered by an elevating/lowering means such as an air cylinder 10, the turn table 11 is turned in the forward/reverse direction by a rotating means such as an air motor 20 to attach/detach the nut N to/from a bolt B. The turn table 11 can incline the axis of rotation in an arbitrary direction, and normally, the axis of rotation is kept perpendicular by a spring. The turn table 11 is provided on an oscillation table capable of the horizontal oscillation. The self-alignment property to the bolt B is given to the nut N on the turn table 11 by the arbitrary inclination of the turn table 11 and the oscillation of the oscillation table.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nut used for attaching and detaching a large nut such as a nut screwed with a bolt for tightening a horizontal butting flange portion of a main turbine high pressure casing in a nuclear power plant. The present invention relates to an attachment / detachment device.

[0002]

2. Description of the Related Art A horizontal butting flange portion of a high pressure casing of a main turbine in a nuclear power plant is fastened by a bolt penetrating substantially vertically and a nut screwed into the bolt from below. Bolts and nuts are both huge, weighing about 50 kg. There is a through hole in the axis of the bolt, through which a wire that locks the nut is passed, and this is pulled up from above the bolt by human power to support the nut in a suspended state. Work is taking place. All of these tasks are performed manually in a small space, resulting in dangerous and heavy labor.

[0003]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an apparatus capable of safely and easily mounting and removing a large nut as described above.

[0004]

According to the present invention, in order to solve the above-mentioned problems, a vertically movable frame 9 is provided on a main frame 5 of a trolley 2 which is movable on a floor F, and the vertically movable frame 9 is provided. A turntable 11 is rotatably provided substantially horizontally on the frame 9, and a nut N is placed on the turntable 11 to rotate the turntable 11.
The lifting and lowering means such as the air cylinder 10, and the turntable 11 is normally and reversely rotated by the rotating means such as the air motor 20 to attach and detach the nut N to and from the bolt B. Configured. Further, the turntable 11 can be freely tilted within a predetermined angle range with respect to the elevating frame 9 in order to tilt the rotary shaft in an arbitrary direction with respect to the vertical, and a spring 18 or the like is used to hold the rotary shaft vertically. The elastic support provides the nut N with self-centering. Further, the turntable 11 is provided on the elevating frame 9 via the swing table 12, and the swing table 12 is supported on the elevating frame 9 so as to be swingable substantially horizontally within a predetermined angle range.
The self-centering property of the nut N is further enhanced.

[0005]

Embodiments of the present invention will be described with reference to the drawings. 1 is a front view of the nut attaching / detaching device, FIG. 2 is a plan view of the nut attaching / detaching device, FIG. 3 is a side view of the nut attaching / detaching device, FIG.
FIG. 5 is a plan view in which a part of the nut attaching / detaching device is cut away, and FIG.
FIG. 4 is a side view in which a part of the nut attaching / detaching device is cut away.

In FIG. 1, a nut attaching / detaching device 1 is formed on a carriage 2 movable on a floor F by casters 3. The trolley | bogie 2 is equipped with the support leg 4, and it can be fixed by grounding this on the floor surface F. On the main frame 5 of the carriage 2, a pair of guide pillars 6 and support pillars 7 are vertically provided upright. The guide pillar 6 and the support pillar 7 are
The top plate 8 is connected at the upper end.

The elevating frame 9 includes a horizontal plate portion 9a, an upright plate portion 9b vertically upright from one end side thereof, and an upright plate portion 9b.
Slide block 9c fixed to the side surface of the stand and the standing plate portion 9b
And a projecting piece 9d horizontally projecting laterally from the upper part of the. A sliding plate 9e made of oiles metal is stretched on the upper surface of the horizontal flat plate portion 9a. The sliding block 9c is slidably engaged with the guide column 6. The lower end of a vertical air cylinder 10 is fixed onto the main frame 5, and its piston rod 10a is connected to the projecting piece 9d.
Therefore, the elevating frame 9 can be vertically moved up and down along the guide column 6 by the air cylinder 10 as the elevating means.

A turntable 11 on which a nut N is placed and rotated is provided on the elevating frame 9 so as to be rotatable substantially horizontally with a swing table 12 interposed. That is, the sliding plate 9 of the horizontal plate portion 9a of the lifting frame 9
A rocking table 12 is superposed on e, and is pivotally supported by a pin 13 so as to be horizontally rockable at substantially the center thereof. The rocking table 12 is provided with arc-shaped elongated holes 12a located on both sides of the pin 13, and the guide pin 14 implanted in the horizontal plate portion 9a penetrates the elongated hole 12a. Therefore, the horizontal swing range of the swing table 12 is such that the pin 14 moves within the elongated hole 12a.
Is limited to the range of movement. A rotary plate 16 is supported on the swing table 12 via a bearing 15 so as to be horizontally rotatable. A passive pulley 17 is fixed to the lower surface of the rotary plate 16. On the upper surface of the rotary plate 16, a plurality of support pins 16a are vertically implanted on the circumference of the rotary shaft, and the turntable 11 is mounted on a spring 18 fitted in the support pins 16a. Turntable 1
The lower part of the center of 1 is connected to the center of the rotary plate 16 by a universal joint 19. Therefore, the rotation of the rotary plate 16 is transmitted to the turntable 11 via the universal joint 19. Also, the turntable 11 is
Although it can be tilted in any direction on the rotary plate 16 by the universal joint 19, it is always elastically supported by the spring 18 so as to hold the rotary shaft vertically. On the upper surface of the turntable 11, 3 is arranged on the circumference of the rotation axis.
One engaging pin 11a is implanted, and this engages with the engaging groove on the lower surface of the nut N.

An air motor 20 as a rotating means of the turntable 11 is mounted on the swing table 12 via a pedestal 21. Rotating shaft 20 of air motor 20
“A” projects into the lower space of the pedestal 21, and the drive pulley 22 is fixed to this. Drive pulley 22 and passive pulley 1
A belt 23 is wound around the air motor 20 and the air motor 20.
Is transmitted to the rotary plate 16 and the turntable 11.

The turntable 1 is mounted on the lifting table 9.
1, a centering guide 24 is provided so as to be adjustable in distance to it. The centering guide 24 has an arc-shaped guide surface along the outer circumference of the turntable 11, and by bringing this into contact with the outer circumference of the nut N, the center of the nut N and the center of the turntable 11 can be roughly aligned. You can do it.

A box-shaped cover 25 is fixed on the main frame 5 so as to cover the guide pillars 6 and the support pillars 7, and a handle 26 for operating the carriage 2 is fixed on the upper portion of the cover 25. ing. An operation panel 27 is formed on the side surface of the cover 25. The operation panel 27 includes a rotation direction switching valve lever 28, a lifting switching valve lever 29, a lifting speed controller 30, a rotation speed controller 31, an emergency stop switch 32, a rotation torque controller 33, a rotation air pressure gauge 34, and a lifting / lowering valve. An air regulator 35 and the like are provided.

As shown in FIG. 1, by using the nut attaching / detaching device 1 of this embodiment, a nut N is attached / detached to / from a bolt B which vertically penetrates a flange portion A of a main turbine high pressure casing in a nuclear power plant. The procedure is explained.

When the nut N is screwed into the bolt B,
By engaging the engaging pin 11a with the groove, the turntable 11
Put the nut N on the top, move the trolley 2, and bring it under the bolt B. By operating the lever 29 of the lifting / lowering switching valve, air is sent to the air cylinder 10, and the lifting / lowering frame 9 is lifted to a position where the upper surface of the nut N lightly contacts the lower end of the bolt B. At this time, if there is a misalignment between the bolt B and the nut N, the bogie 2 is moved to perform centering. Next, by operating the lever 28 of the rotation direction switching valve,
While rotating the turntable 11 clockwise, the elevating frame 9 is raised and the nut N is screwed into the bolt B. When the alignment of the bolt B and the nut N is insufficient, or when the axis of the nut N is inclined with respect to the axis of the bolt B,
The nut N does not eat well. In such a case, the carriage 2 and the swing table 12 are swung in the horizontal direction so as to be bitten. At this time, the turntable 11 is appropriately tilted to facilitate the alignment. When the screwing of the nut N into the predetermined position is completed, the rotation of the turntable 11 is stopped, the elevating frame 9 is lowered to the lower limit position, and the work is completed.

Next, when removing the nut N from the bolt B, the carriage 2 is moved and set at a position where the center of the turntable 11 is aligned with the center of the bolt B. By operating the lever 29 of the lift switching valve, the lift frame 9 is lifted to a position where the upper end of the engagement pin 11a on the turntable 11 makes a light contact with the lower surface of the nut N. Perform centering again, operate the lever 28 of the rotation direction switching valve,
The turntable 11 is slowly rotated clockwise and stopped when the engaging pin 11a is aligned with the engaging groove of the nut N. Next, the elevating frame 9 is raised to engage the engaging pin 11a.
When it is confirmed that is engaged with the engaging groove of the nut N, the turntable 11 is rotated counterclockwise to lower the nut N.
While the air cylinder 9 is in the ascending mode during this time, the nut N descends with a predetermined torque according to the screw pitch, so the elevating frame 9 is pushed by the nut N and descends. When the nut N comes off the lower end of the bolt B, the nut N
Since the lifting frame 9 is loaded only by its own weight, the lifting frame 9 holds the nut N at that position. After visually confirming that the nut N has come off the lower end of the bolt B, the rotation of the turntable 11 is stopped, and the lever 29 of the lifting / lowering switching valve is operated for the first time to move the lifting / lowering frame 9 downward.
The work is completed by lowering to the lower limit position. The air pressure sent to the air cylinder 9 is adjusted in advance by the regulator 35 according to the weight of the nut to which the present device is applied. Also, while watching the pressure gauge 34, the rotation torque controller 33 is adjusted to obtain a desired rotation torque of the turntable 11.

The present invention is not limited to the illustrated embodiment, and for example, the raising and lowering of the raising and lowering frame 9 and the rotation of the turntable 11 can be performed by an electric motor instead of the air motor and the air cylinder. .

[0016]

As described above, in the present invention, the first
In addition, an elevating frame 9 is provided on the main frame 5 of the carriage 2 which is movable on the floor surface F so as to be vertically ascendable, and on the elevating frame 9, a turntable 11 is rotatable substantially horizontally.
Is provided, and the nut N is placed on the turntable 11 to rotate the turntable 11.
The large nut attaching / detaching device 1 is configured such that the turntable 11 is lifted / lowered by a lifting means such as 0, and the turntable 11 is normally / reversely rotated by a rotating means such as the air motor 20 to attach / detach the nut N to / from the bolt B. The effect of being able to safely and easily attach and detach a large nut is achieved. Second, the turntable 11 can be freely tilted within a predetermined angle with respect to the elevating frame 9 to tilt the rotary shaft in an arbitrary direction with respect to the vertical, and the spring 18 can hold the rotary shaft vertically. Since it is elastically supported by, for example, the self-centering property of the nut N is imparted, and it is possible to easily align the center with the nut B. Third,
Since the turntable 11 is provided on the elevating frame 9 via the swing table 12, and the swing table 12 is supported on the elevating frame 9 so as to be swingable substantially horizontally within a predetermined angle range, the self-centering property of the nut N is reduced. The effect is further enhanced, and the alignment with the bolt B can be performed more easily.

[Brief description of drawings]

FIG. 1 is a front view of a nut attaching / detaching device.

FIG. 2 is a plan view of the nut attaching / detaching device.

FIG. 3 is a side view of the nut attaching / detaching device.

FIG. 4 is a front view in which a part of the nut attaching / detaching device is cut away.

FIG. 5 is a plan view in which a part of the nut attaching / detaching device is cut away.

FIG. 6 is a side view in which a part of the nut attaching / detaching device is cut away.

[Explanation of symbols]

 1 nut attaching / detaching device 2 bogie 3 caster 5 main frame 9 lifting frame 10 air cylinder (lifting means) 11 turntable 12 swinging table 18 spring 20 air motor (rotating means) B bolt F floor surface N nut

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tadao Fukuda 6-5-19 Minamishinagawa, Shinagawa-ku, Tokyo Sanwa Tekki Co., Ltd. (72) Eijiro Kojima 6-5 Minamishinagawa, Shinagawa-ku, Tokyo No. 19 Inside Sanwa Tekki Co., Ltd. (72) Inventor Takuya Osawa Inside Sanwa Tekki Co., Ltd. 6-5-19 Minamishinagawa, Shinagawa-ku, Tokyo

Claims (5)

[Claims] 1. A device for attaching and detaching a nut to a bolt arranged so that its shaft portion faces the floor surface substantially perpendicularly to the floor surface, and a trolley that is movable on the floor surface. An elevating frame vertically movably provided on a main frame, a turntable rotatably substantially horizontally rotatably provided on the elevating frame for mounting the nut on the upper part and rotating the elevating frame. An elevating means for elevating and lowering, and a rotating means for rotating the turntable forward and reverse are provided, and while elevating the elevating frame while rotating the turntable on which the nut is mounted, the nut is moved relative to the bolt. A large nut attaching / detaching device characterized by being attached / detached. 2. The turntable is freely tiltable within a predetermined angle range with respect to the elevating frame in order to tilt the rotary shaft in an arbitrary direction with respect to the vertical, and holds the rotary shaft vertically. The large-sized nut attaching / detaching device according to claim 1, which is elastically supported as much as possible. 3. The turntable is provided on the elevating frame via a swing table, and the swing table is provided on the elevating frame so as to be rotatable substantially horizontally within a predetermined angle range. Claim 1 characterized by the above.
Or a device for attaching and detaching a large nut according to 2. 4. The elevating frame includes a slide block slidably engaged with a guide column vertically erected on the main frame, and the elevating means vertically erects on the main frame. The large nut attaching / detaching device according to claim 1 or 3, wherein the rotating means is an air motor fixed on the revolving frame. 5. The large nut attaching / detaching device according to claim 4, wherein the turntable is connected to a rotating shaft of the air motor through a universal joint supported on the revolving frame.