JPH03221900A - Device for grinding flange sheet face - Google Patents

Abstract

PURPOSE:To mechanize the cleaning and grinding work of the flange sheet face of a reactor pressure vessel body by fixing the grinding device to the flange face of the body without especially installing a large device supporting frame. CONSTITUTION:Two front wheels 2 and two rear wheels 3 are pivoted upon a traveling plate 1 arranged along the body flange sheet face 33, the front and rear wheels 2, 3 are interlocked and rotated by a traveling motor 4 and the flange sheet face 33 is ground by a grinding part having a rotary grinder 11. A steering mechanism links the front and rear wheels 2, 3 in the same direction so that an intersecting angle formed by a tangent passing the outer circumference of the flange and an intersecting part between the wheel axes of the front and rear wheels 2, 3 and the wheel axes of the front wheels 2 or the rear wheels 3 forms an acute angle in the advancing direction. A wheel removing mechanism is arranged so as to be abutted on the inside of the flange. since the device can easily be fixed to the flange face without especially installing a large device supporting frame, the flange sheet face can be cleaned and ground by automatic traveling.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a pressure vessel body flange sheet surface polishing device, particularly for cleaning and removing deposits, dust, etc. from the reactor pressure vessel body flange sheet surface. This invention relates to a flange sheet surface polishing device.

(Prior art) As shown in FIGS. 17 and 18, a nuclear reactor pressure vessel is
The upper lid 41 and the body 42 are tightened using a large number of stud bolts 34, nuts 43, and washers 44 to form a fastening portion as a pressure vessel.

That is, the stud bolt 34 is implanted in the fuselage flange 45 via the threaded portion 46, and the stud bolt 34
4 through the through hole 48, bringing the upper lid flange 47 and the body flange 45 into contact with each other, and fastening the nut 43 to the threaded portion 49 via the washer 44.
This is to tighten the rules.

FIG. 19 shows a sealing structure diagram of the upper lid 41 and the body 42, and FIG. 20 shows a partially enlarged detailed view of FIG. 19. As is clear from FIG. 20, the ``1 lid flange 47 and the body flange 45 are in contact with each other through the seat surfaces 33 and 33, and the ○ ring mounting groove 51 is formed in the seat surface 33 of the upper flange 47. A circle ring 50 is attached inside it.

1. By fastening the stud bolt 34 and the nut I-43, the cross-sectional shape of the ring 50 is elastically deformed into an elliptical shape, and the reaction force accompanying the deformation maintains the sealing force of the seat surface 33.33. Further, the outer surface of the circle ring 50 is plated with silver, and the tightening described above causes the silver plating film to enter the minute gaps between the sheet surfaces 33 and 33, thereby improving the sealing performance.

On the other hand, for the reactor pressure vessel, for regular inspection approximately once a year, the first lid 41 is opened and the ○ ring 50 is replaced with a new one. During this replacement work, it is important to remove foreign matter such as the silver plating powder or dust attached to the sheet surface of the used ○ ring 50 and clean it in order to maintain its sealing performance. It is.

The seat surface 33 of the fuselage flange 45 is a local surface of the reactor pressure vessel located below the operation floor 52 in the reactor building 54, as shown in FIG. 21, when viewed from the entire system. Furthermore, as shown in the perspective view of FIG. 22, it is located inside the body flange 45 surrounded by a large number of stud bolts 34, and the distance between the stud bolts 34 is such that only one hand can be inserted in the actual size. belongs to. Furthermore, water 55 is stored inside the fuselage flange 45.

In such a working environment, in order to minimize exposure to radiation from inside the reactor, workers must maintain a low posture when tightening the stud bolts 34.
It is customary to manually clean the seat surface 33 between the stud bolt 34 and the stud bolt 34 by polishing with a grindstone.

Techniques for carrying out this type of cleaning using a mechanical carpet device are disclosed in Jitsukai Publication No. 1983-1.34200 and Jikkoi No. 59-1983.
There is a technology disclosed in Japanese Patent No. 7900, and the Utility Application No. 1983-
No. 97786 has been previously filed.

(Problems to be Solved by the Invention) Among the above-mentioned conventional techniques, manual work involves work in highly contaminated areas, so it is necessary to wear protective clothing and equipment.
In addition to the risk of internal radiation exposure, there was also the problem of decreased work efficiency.

In addition, Jikosho 6 was devised to automate cleaning and polishing.
0- ], No. 34200, the stud bolts had to be removed to install, and the longer the work time, the greater the risk of worker exposure to radiation, which was inefficient and economically problematic. Regarding the prior design of No. 97786, it is preferable to give further consideration to the simplification of peripheral equipment, ease of handling, and miniaturization.

The present invention solves the above-mentioned problems of the prior art, stably mechanizes the cleaning and polishing work of the reactor pressure vessel fuselage flange sheet surface, and collects and dissipates the dust generated by the polishing work that is easily scattered. It is an object of the present invention to provide a small and easy-to-handle fuselage flange sheet surface polishing device that can prevent contamination of the working environment and exposure of workers to radioactivity due to radioactivity.

(Means for Solving the Problems) The above object is to provide a running plate provided along the fuselage flange seam surface, a pair of front wheels and a pair of rear wheels pivotally supported on the running notebook. , a running section that rotationally drives the front wheels and the rear wheels in conjunction with each other, a polishing section that polishes the flange sheet surface, and passing through the intersection of the outer circumference of the body flange and the axle lines of the front wheels and the rear wheels. a steering mechanism for interlocking the front wheels and the rear wheels in the same direction and contacting the inside of the body flange so that an intersection angle between a tangent line and the axle line of the front wheel or the rear wheel forms an acute angle with respect to the traveling direction; This is achieved by a flange sheet surface polishing device characterized by having a derailing mechanism.

(Function) With the above configuration, the device can be easily attached to the fuselage flange surface without installing a large device support pedestal, thereby making it possible to clean and polish the flange sheet surface through stable automatic running.

(Example) An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is an overall layout diagram of a flange sheet surface polishing device according to the present invention, in which a running plate 1 has a running section 70 that transmits rotational force from a running motor 4 to drive the front wheels 2 and rear wheels 3.
and an external unit l-90 disposed on the elevating plate 15 and including a polishing section 80 including a rotary grindstone 11 and a dust collector 36.
(shown in Figure 2). As shown in FIGS. 3 and 4, the traveling section 70 is a self-propelled vehicle having front wheels 2a, 2b and rear wheels 3a, 3b at the front and rear of the traveling plate 1 having a radius of curvature approximately equal to that of the body flange 45, The front wheel 2a passes through the running motor 4, the running gear box 5, the pulley 6, and the belt A7, and then the rear wheel 3 via the belt B8.
a is driven and performs forward and backward movements. 23 is a guide roller, and 26 is a belt guide roller.

The distance traveled by the front wheel 2b and the distance traveled by the front wheel 2a are larger by the difference in the radius of curvature, that is, the number of rotations of the front wheel 2b is greater than the number of rotations of the front wheel 2a, and this relationship is similar to that of the rear wheels 3a and 3b.
The same applies to Therefore, the front wheel 21] and the front wheel 2a,
Both the rear wheels 3b and 3a are supported by bearings so that they are not restrained by the rotational movement of the other side.

Bearing 25 for front wheels 2a, 2b and bearing 2 for rear wheels 3a, 3b
5 is a bearing fixing pin 2 as shown in FIGS. 5 and 6, respectively.
7 so as to be rotatable in the horizontal direction, and both bearings 25 are connected to the lever A30.7 via a link 29, as shown in FIG. Since they are connected by lever B31 and one end of link 29 is driven by air cylinder 28,
Front wheel 2a.

2b, rear wheels 3a, 3b can be steered in conjunction with each other in the same direction. As a result, when the running plate 1 moves forward in the direction of the arrow a, the angle α formed by the axis of the front wheels 2a, 2b or the rear wheels 3a, 3b with the tangent F' of the body flange 45 and the traveling direction arrow a is ,
It is adjusted to form an acute angle as shown in FIG. For this reason, the traveling plate 1 is steered in a direction approaching the stud bolt 34, but as shown in FIG.
Since the guide roller 23 attached to the traveling plate 1-1 is in contact with the inner surface of the body flange 45, the traveling plate 1 moves forward along the body flange 45 without separating from the body flange 45.

The derailing mechanism described in claim 1 refers to, for example, the guide roller 23. When moving backward, by driving the cylinder 28 in the opposite direction, the axes of the front wheels 2a, 2b or the rear wheels 3a, 3b are aligned with the tangent F of the fuselage flange 45 and the traveling direction arrow, as shown in FIG. The angle β formed with respect to the angle β is adjusted to be an acute angle. Therefore, the running plate can always run stably following the seat surface 33. This is the operating principle of the steering mechanism.

A pair of sensors 24 provided near the front wheels 2 and rear wheels 3 shown in FIG.
3, the vehicle continues to travel, and as shown in FIG. 10, when at least one of the sensors 24 no longer senses the seat surface, the vehicle automatically stops the travel motor 4. Thereby, it is possible to prevent the traveling plate 1 from coming off the wheel due to a failure of the steering mechanism. Furthermore, the sensor 24 is connected not only to the driving motor 4, but also to the driving motor 4.
The polishing motor 13 is also controlled to be stopped, and all functions related to traveling and polishing can be stopped.

Next, the configuration of the polishing section 80 will be explained with reference to FIGS. 11 and 12. The lifting plate 15 is a polishing motor 13,
A polishing gear box 14 is mounted, and the gear box 14 further fixes a rotating grindstone 11 supported by a bearing 10 via a triangular indicator 9. 32 is a rotating grindstone] 1
This is a dust cover to prevent dust during rotary polishing. The power of the polishing motor 13 is transmitted to the rotating grindstone via the gear box 14, the pulley A59, the tinning belt]2, and the pulley B60.

FIG. 12 is a cross-sectional view of the vicinity of the rotating grindstone 1 shown in FIG. ing. The dust cover 32 covers the rotary grindstone 1 and is fixed to the bearing 10 using positioning screws 55 in the vicinity of the seat surface 33 in order to prevent dust generated by polishing the seat surface 33 from scattering. An absorption hose 38 of a dust collector 36 constituting an external unit I/90 is connected to the discharge port 37 of the dust cover 32 (FIG. 16) to absorb m dust.

A weight n58 fixed to the upper part of the gear box 14 applies a pressing force necessary for polishing to the seat surface 33 of the rotary grindstone 11.

Next, a connection structure between the running section 70 and the polishing section 80 will be explained. The lifting plate 15 and the running plate l are the 13th
(section A in FIG. 1), FIG. 14 (section B in the same figure), and FIG. 15 (section C in the same figure). As shown in FIG. 13, the traveling plate 1 is connected via a bin 22 using a bracket B21 and a bracket A20, respectively, and the lifting plates 1-15 can be rotated using the bin 22 as a fulcrum. is supported by On the other hand, as shown in FIG. 14, an air cylinder 16 is supported and fixed at the end of the elevating notebook 15 via a bracket D17 and a bottle 19, and as shown in FIG. The cylinder rod 35 is loosely supported by a bracket C]8 fixed to the plate 1 and an elongated hole extending downward. The rotary whetstone 11 can be automatically moved downward by the action of the air cylinder] 6, so that the rotary whetstone 11 can be moved away from the seat surface 33 before and after the polishing work is started and then moved to the running section. 7o
When moving the entire unit, vertical movement is possible. Further, the weight 58 tilts the elevating plate 15 using the bin 22 as a fulcrum, and loads the rotary whetstone 11 with an appropriate pressing force against the seat surface 33.
This is to follow the wear of the surface and perform uniform polishing.

Next, the driving sequence will be described. First, when moving forward, turn on the forward switch of the control I/roll box (not shown) to move the dust collector 1 forward. 36 is started, and the front wheel 2a is rotated by the action of the steering mechanism.
, 2b and rear wheels 3a, 31] are set to the state shown in FIG. 5, and the polishing motor 14 is started. Next, the air cylinder 16 is activated and the rotary grindstone 11 is moved to the seat surface 3.
3, the traveling motor 5 is started immediately and forward movement and polishing work are started. As mentioned above, in the event that the sensor 24 attached to the traveling plate 1 is detected to have come off the sheet surface 33 in Figure 1O during the polishing operation, the forward movement and polishing movement will be stopped. However, the order of stopping is that first the air cylinder 16 is activated and the rotary grindstone 1 is activated.
1 leaves the seat surface, the traveling motor 4 stops. The reason for this is that when the traveling plate l stops, if the rotary grindstone 11 continues to rotate while remaining stationary at the same location on the seat surface 33 immediately before starting or finishing the polishing operation, local polishing may occur. This is to prevent the flatness of the sheet surface from decreasing due to this.

As shown in FIG. 2, the external unit 90 is located outside the body flange 45, and the dust collector 36 is equipped with casters and moves with the movement of the running section 70 and the polishing section 80. A compressor for operating an air cylinder (to be described later) is not shown in the drawings (9), and the dust collector 36 operates for a certain period of time and stops after sufficiently removing dust. When stopped, the polishing motor 13, traveling motor 4, and dust collector 3 can be turned off by operating a switch.
However, the order of stopping is exactly the same as when the sensor 24 is activated in order to prevent local polishing unevenness and to sufficiently remove dust. When reversing, turn on the reverse switch and the steering mechanism will first move the front wheels 2a, 2b or the rear wheels 3a, 3.
b becomes the state shown in FIG. 6 and the backward movement begins. During the retreat, the rotary grindstone 11 is away from the sheet surface and no polishing is performed.

Each of these operations is performed by an operator by remote control from outside the fuselage flange 45.

Finally, the cleaning procedure using the flange sheet surface polishing apparatus of the present invention will be explained with reference to FIGS. 2 and 17. The absorption hose 38 of the dust collector 36 is connected to the outlet 37 of the dust cover 32. Next, the control cable 39 and the air pipe 62 for operating the two air cylinders are attached to the dust collector 36, and fixed to a support 40 having sufficient rigidity, thereby tightening the stud bolt 3.
This prevents interference with 4. Next, the main body of the device of the present invention is attached onto the seat surface 33. At this time, during regular inspections, several stud bolts 34 are usually removed for sampling inspection, so it is convenient to use that space to install the device. As shown in FIG. 8, each time the guide roller 23 is installed so as to come into contact with the inner wall of the body flange 45, the front wheels 2a, 2b and the rear wheels 3a, 3b are opposed to the seat surface 33. be adaptively positioned. Thereafter, when the operator outside the fuselage flange 45 turns on the advance switch of the control box, the polishing work of the seat surface 33 is automatically performed according to the operation sequence described above. At this time, it is preferable to have an observer in addition to the operator to monitor the polishing condition of the sheet surface 33. If uneven polishing is discovered, the operator will stop the equipment and move backwards according to the instructions of the inspector. re-polishing can be performed. In addition, even if an accident such as an earthquake occurs during work, the equipment is suspended from a support with the required rigidity by the wire cable 63 and suction hose 38 to prevent the equipment from falling into the reactor interior. Is possible.

(Effects of the invention) By carrying out the present invention, cleaning and polishing work of the reactor pressure vessel fuselage flange sheet surface can be stably mechanized, dust that is generated during the polishing work and easily scattered can be collected by a dust collector, and radioactive We can provide a small and easy-to-handle fuselage flange seam/heavy polishing device that can prevent contamination of the working environment due to radioactivity and prevent workers from being exposed to radiation. There is something.

[Brief explanation of drawings]

FIG. 1 is an overall layout diagram of the flange sheet surface polishing device according to the present invention, and FIG. 2 is a perspective view of the flange sheet surface polishing device of the present invention including an external unit set on the seat surface of the fuselage flange. Fig. 3 is a side view of the running section in Fig. 1, Fig. 4 is a top view of the same, Fig. 5 is a top view showing the corner of the mounting on the running plate of the front wheel during forward movement, and Fig. 6 7 is a plan view showing the steering mechanism of the front and rear wheels, and FIG. 8 is a flange seat of the present invention during running. FIG. 9 is a front view of the heavy polishing device of the present invention, showing the flange sheet heavy polishing device of the present invention when it is running normally; FIG. 10 is a front view of the flange sheet surface polishing device of the present invention when it is running abnormally. 11 is a side view of the polishing section in FIG. 1, FIG. 12 is a partial sectional view of FIG. 11, FIG. 13,
14 and 15 are partial details of FIG. 1, FIG. 16 is a front view during polishing and cleaning by the flange sheet surface polishing device of the present invention, and FIG. A diagram showing the fastening part, FIG. 18 is a partially enlarged detailed view of FIG. 17,
Figure 19 is a diagram of the sealed structure of the ``1 lid and the fuselage, Figure 20 is a partially enlarged detailed view of Figure 19, Figure 21 is an overall view of the reactor pressure vessel showing the ``1 lid open state,'' Figure 22. is a perspective view of the seat surface from inside the fuselage flange. 1... Running plate 2a, 2b... Front wheels 3a, 3
1)...Rear wheel 4 - Traveling motor 5 - Traveling gear box 6... Pulley C7... Belt A
8... Belt B9... Triangular support part 10...
Bearing 11... Rotating grindstone 12... Tinning belt 13... Polishing motor 14... Polishing gear box 15... Lifting plate 16... Air cylinder A17... Bracket D 18. ...Bracket +-C19...Bin 20...Bracket A21...Bracket B 22...Bin 23...Guide roller 24...Sensor 25...Bearing
26... Belt guide roller 27... Bearing fixing bin 28... Air cylinder 29... Link 30
...Lever A31...Lever B 32...
Dust cover 33...Seat surface 34...Stud bolt 35...Cylinder rod 36...Dust collector 3
7...Discharge port 38...Suction hose 39 Control cable O...Strut 41...Top lid 2...Body
43...Nut 4...Washer 45
...Body flange 6...Threaded part 47...Top lid flange 8...Threaded hole 49...Threaded part 0...
・O-ring 51...O-ring mounting groove 2...Operation floor 3...Reactor pressure vessel 54...Reactor building 5...
Water 56...Volt A7...Pol l-B
58... Weight 9... Pulley A 60.
...Pulley B2...Air pipe 63...Wire cable 4...Cable hook 65...Rotary shaft 6...
...Bolt CO...Travel section 8o...Grinding section 0...External unit

Claims (1)

[Claims] 1. A body flange surface polishing device that travels around a body flange of a pressure vessel to polish the flange sheet surface, including a traveling plate provided along the flange sheet surface, and a traveling plate provided along the flange sheet surface; A pair of pivotally supported front wheels and a pair of rear wheels, a running section that rotationally drives the front wheels and the rear wheels in conjunction with each other, a polishing section that polishes the flange sheet surface, and an outer circumference of the body flange. The front wheels and the rear wheels are moved in the same direction so that a tangent passing through the intersection between A flange sheet surface polishing device comprising: a steering mechanism interlocked with the body flange; and a derailing mechanism in contact with the inside of the body flange. 2. The flange sheet surface polishing device according to claim 1, further comprising a dust collector attached to the outside of the body flange to treat dust generated in the polishing section.