JPS6232721Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a processing machine for repairing the seat surface of a diaphragm valve. By attaching a boring head to a fixed jig, it is possible to perform reliable cutting in a short time using power. It is characterized by the following.

This invention was developed especially for modifying the seat part during periodic inspections of valves in radiation-controlled areas used in nuclear power plants, etc., to minimize contact with radioactive valves. This makes it possible to process the sheet portion in a short time even by remote control.

At nuclear power plants, strict periodic inspections are required for the equipment used within them. In valves, especially the contact surface between the valve seat and the valve body, and in closed type valves using diaphragms,
Since "indentations" occur on the seat surface (shoulder) inside the valve body that holds the outer periphery of the diaphragm, when disassembling the valve, these indentations and other scratches must be completely removed before sliding and reassembly. No.

However, until now, when modifying the seat surface 3 of the diaphragm 2 in a valve 1 as shown in FIG.
After removing all parts such as the sleeve 7, sandpaper 13 is pasted on the lower surface of the circular collar of the sliding fitting 12 which has a shaft 11 at the center of the upper surface of the circular collar 10 as shown in FIG. Insert the T-shaped handle 15 into the seat surface 3, and while applying downward force, an expert rotates the circular collar forward and backward at a certain angle.
He was leveling the surface.

In this conventional method, it takes even an experienced person several hours to several tens of hours to scrape off the impressions on the seat surface, and since the face and hands are located directly above the valve body 8, the degree of radiation exposure is large. The work could only be done for a very short period of time, and a large number of workers were required to inspect and repair one valve, making it extremely uneconomical.

In view of the above-mentioned situation, the inventor of the present invention came up with the idea after considering how to shorten the working time under any adverse conditions, and an embodiment thereof will be explained below with reference to FIG. 3.

In the figure, reference numeral 16 denotes a boring head, and a cutting tool 18 having a tip 17 at the lower end is provided so as to be able to project in the horizontal direction, and the amount of projection of this cutting tool is determined by adjusting the position of a stopper 19. 20 is a stop pin, and when the right stopper touches this pin, the feed button 22 will protrude, and the rotation of the head will continue, but the feed of the bite will automatically stop.
Reference numeral 23 denotes a quick return button, which is used to quickly return the cutting tool 18 to its original position by pushing down the knob 24 projected above the cover and pushing the quick return button 23 through the operating shaft 25. 26 is a stopper rod, 27 is a tapered handle, and the above-mentioned boring head is a conventionally known one (boring head UFB-1 manufactured and sold by Kuroda Seiko Co., Ltd., head office, Saiwai-ku, Kawasaki City). It is possible.

29 is an inner sleeve, which has a tapered hole 30 in the lower central half and a square hole 31 at the upper end, a female thread 32 in the middle so that the handle 27 of the boring head can be fixed with a bolt 33, and has a flange 34 on the outer periphery.
is an outer sleeve, the outer circumference of which is provided with a male thread 36 which screws into the female thread 9 provided on the inner circumferential wall of the valve body 8, and the upper outer circumference of which is provided with a flange 37.
A needle bearing 38 is provided between the lower part of the inner sleeve 29, and a thrust bearing 39 is provided on the upper part of the flange 34 so that the flange can rotate. A plurality of cover mounting screws 40 are provided on the flange, and a deep hole 41 for rotation is provided on the side of the flange. Reference numeral 42 denotes a cover, which is fixed to the upper surface of the outer sleeve 35 by a bolt 43 in a state in which it passes through the inner sleeve 29. A thrust bearing 44 is fixed by a nut 45 at the boundary between the cover and the inner sleeve. Reference numeral 46 denotes a lock nut, which is fixed to the outer sleeve 35 by a bolt 43.
5 is screwed into the valve body 8, and a deep hole 47 for fastening is provided on the outer periphery thereof.

As shown in the drawings, the operating shaft 25 for operating the quick return button of the boring head described above is provided through the outer sleeve 35 and the cover 42.

In the present invention, a square shaft 48 for driving is fitted into the square hole 31 at the upper end of the inner sleeve of the processing machine, and this square shaft is rotated by an air motor (not shown) via a universal joint 49. ing.

Next, the usage pattern of the processing machine according to the present invention will be explained. After removing the cap 4 from the valve 1 and taking out the parts inside the valve, measure the dimension from the open end of the valve body 8 to the seat surface 3 of the diaphragm, and use the chip at the tip of the boring head to scrape the dimension (approximately 0.1
~0.2mm) The outer sleeve of the processing machine 35
is screwed into the female thread 9 on the inner peripheral wall of the valve body to a predetermined position and fixed with a lock nut 46. At this time, it is natural to determine the stroke of the boring head's bite and to press the feed button 22.

Next, when the air motor is rotated, the cutting tool 18 of the boring head 16 rotates and protrudes toward the outer circumference, cutting the sheet surface 3. When a predetermined amount has been removed, the stopper 19 hits the stop pin 20, the feed button 22 protrudes, and only the feed of the tool stops automatically. Then, when the knob 24 is pushed down and the quick return button 23 is lowered, the cutting tool 18 quickly returns to its original state and the machining is completed. After that, remove the driving square shaft 48 in the opposite direction to the setting described above,
Simply loosen the lock nut 46 and remove the outer sleeve 35 from the valve body.

By the above-mentioned processing, the impressions on the sheet surface are completely removed and a smooth surface is obtained, but if necessary, the sheet may be further finished with sandpaper.

When the present inventor manufactured and used the above-mentioned processing machine, it took 5 to 6 seconds to set the processing machine on the valve body.
The cutting process is completed in about 1 minute, and then it takes about 1 minute to remove the processing machine, making it possible to finish processing the diaphragm sheet surface in about 15 minutes, which is 1/20 to 1/20 of the time required conventionally. I was able to do it in a short time of /30.

As mentioned above, the sheet surface processing machine according to the present invention has a relatively simple structure, but the work that conventionally took even a skilled worker several hours can be done without the need for a skilled worker.
It can be completed in about a minute and is indispensable especially for cutting the seat surfaces of valves in radiation-controlled areas used in nuclear power plants. In addition, since the processing machine according to the present invention processes the valve body in a sealed state, even if you are near the valve body during processing, you will only be exposed to a small amount of radiation.
It is also possible to remotely control the air motor in a separate safe room.

Furthermore, this processing machine has the advantage of automatically performing accurate cutting work because no manual work is involved.

In addition, in the above embodiment, processing of the seat surface of a diaphragm valve was explained, but this is not limited to this; by changing the shape and angle of the tip at the tip of the cutting tool, various valve seat surfaces can be automatically processed in the same way as described above. Needless to say, it can be cut.

[Brief explanation of the drawing]

The drawings all show one embodiment; Fig. 1 is a vertical side view of a piped valve, Fig. 2 is a longitudinal side view of a conventional sliding fitting installed in the valve body, and Fig. 3 is a vertical side view of a valve with piping installed. FIG. 2 is a longitudinal sectional side view of the processing machine according to the present invention loaded into the valve body. 1... Valve, 2... Diaphragm, 3... Seat surface, 4... Cap, 8... Valve body, 9... Female thread, 16... Boring head, 18... Bit, 29... Inner sleeve, 35 ...Outer sleeve, 36...Male thread, 42...Cover, 46...
Lock nut, 48...square shaft, 49...universal joint.

Claims (1)

[Scope of utility model registration request] On the outside of the inner sleeve 29, which has a tapered hole 30 in the lower center half and a square hole 31 in the upper end, there is a male screw 36 on the outer periphery that can be screwed into the female screw 9 on the inner peripheral wall of the valve body 8, and a flange on the upper part. An outer sleeve 35 having a diameter of 37 is rotatably provided, and a cover 42 is fixedly integrated into the upper part of the outer flange by penetrating the upper part of the inner sleeve, and a tapered handle 27 of the boring head 16 is inserted into the tapered hole 30. At the same time, the operating shaft 25 for operating the quick return button 23 of the boring head is passed through the outer sleeve and the cover so that it can be operated from the outside, while a lock nut 46 is screwed into the male thread on the outer periphery of the outer sleeve. A processing machine for processing a seat surface of a valve, characterized in that a driving square shaft 48 is fitted into the square hole 31 at the upper end of the inner sleeve and rotated.