JPH0351602Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a clamping device installed in a water chamber of a steam generator.

<Prior Art> FIG. 7 shows a water chamber 2 of a steam generator. This water chamber 2 is formed below a tube plate 6 having a plurality of heat transfer tubes 4 as its ceiling, and has a nozzle 8 at the lower right in the figure and a manhole 10 at the lower left. have. This manhole 10 is used to carry equipment, etc. into the water chamber 2. For example, for inspection and repair inside the steam generator, a plug (not shown) for closing the nozzle 8 and necessary equipment are carried through the manhole 10. do. FIG. 7 100 shows a pulley used in this case. The pulley 100 is fixed to the tube plate 6 with a clamp device 102 as shown in FIG.
In addition, lighting devices, ITVs, etc. are also fixed to the tube plate 6 by such a clamp device 102. The clamp device 102 will be described below.

This clamp device 102 has a pressing shaft 106 mounted on a cylindrical base 104 as shown in FIGS. 8 and 9.
A sleeve 110 is provided between the locking part 108 attached to the tip of the pressing shaft 106 and the base 104 so that the flexible bush 1 can be slid freely.
12, and a link mechanism 11 that moves the pressing shaft 106 in the axial direction toward the base end side of the pressing shaft 106.
4 is attached. In other words, fixing using this clamping device 102 first involves attaching the support shaft 1 to the base 104 as shown in FIG.
16, the press shaft 106 is carried from the manhole 10 to the tube plate 6 and inserted into the heat transfer tube 4 provided in the tube plate 6. Once the pressing shaft 106 is inserted into the heat transfer tube 4, the operating arm 118 of the link mechanism 114 is used to rotate the rotating arm 120 of the link mechanism 114 in the horizontal direction. A connecting plate 12 is attached to one end of this rotating arm 120.
A pressing shaft 106 is connected to the heat exchanger tube 106 via the rotary arm 120, and when the rotary arm 120 is rotated, the pressing shaft 106 is pulled down and the bushing 112 is crushed and expanded laterally, and as shown in FIG. It is fixed inside. The figure shows a pulley 100 attached to the clamp device 102.
The pulley 100 shown in FIG. 7 is also fixed in this manner.

<Problems to be solved by the invention> However, such a clamping device 102 has two parts: a support shaft 116 that supports the clamping device 102 and the instrument to be fixed by the clamping device 102, and an operating arm 118 that performs the clamping operation. It is necessary to operate the operating rod, so two workers are required for the work, and furthermore, the work is difficult and time-consuming because the work is done by two people through the narrow manhole 10, and the work must be done in an awkward position. It was impossible.

<Means for solving the problem> Therefore, in the present invention, the taper shaft is provided so as to be moved in the axial direction by air pressure, the wedge portion is set to be able to expand and contract by the movement of this taper shaft, and the movement of the taper shaft is fixed. A pneumatic supply/discharge valve device is provided to do this, and the clamp device is configured such that an air nozzle provided at the tip of the operating rod can be removably inserted into the nozzle hole of the supply/discharge valve device.

<Example> FIG. 1 shows an example of a clamp device 12 according to the present invention. This clamp device 12 has a base 14.
A cylinder chamber 16 is provided therein, a piston 18 is housed within this cylinder chamber 16, and a tapered shaft 20 is integrally fixed to this piston 18. The base 14 has a cylinder chamber 16 and a tube plate 6.
It has a contact part 22 that comes into contact with the contact part 2, and this contact part 2
A guide tube 24 is provided inside the tube 2. The tapered shaft 20 is formed to be thicker at the top in the figure, and is inserted inside the guide tube 24, and the guide tube 24 has several wedge portions 26 so as to come into contact with the tapered portion of the tapered shaft 20. It is provided. The wedge portions 26 are slidable from the notch formed in the guide tube 24 in the left-right direction in the figure, that is, toward the inner circumferential surface of the heat exchanger tube 4. O-ring 28 to prevent it from falling off from 24
is wrapped.

On the other hand, the cylinder chamber 16 is divided into upper and lower sections by the piston 18, and air passages 30 and 32 communicate with each of the divided chambers. The air passages 30 and 32 are connected to valve devices 34 and 36, respectively, shown in FIG.
It is designed to be connected to 0. The valve device 34
and 36 are valve seat portions 4 which are arranged in parallel and integrally attached to the base 14 and fixed therein.
A valve stem 44 is slidably inserted into the valve stem 2.
4 toward the valve seat portion 42, the valve seat portion 42 is normally blocked from ventilation by the valve rod 44. As shown in FIG. 5, the air nozzle 40 is adapted to the installation of the valve devices 34 and 36, and is attached to the operating rod 38 via a spherical bearing 48 in a double series. 38 can be changed freely. Furthermore, the tip of the air nozzle 40 protrudes thinly as a tip 50, and the air nozzle 40
When inserted into the valve devices 34 and 36, the tip portion 5
0 presses the valve stem 44 and causes the valve seat 42 to communicate with the air nozzle 40. A groove 52 is formed on the outer periphery of the air nozzle 40, and when the air nozzle 40 is inserted into the valve device 34 etc., it fits into a protrusion 54 provided on the side of the valve device 34 etc., and the air nozzle 40 is inserted into the valve device 34 etc. It is adapted to remain connected to devices 34 and 36. 56 is an air pipe connected to the air nozzle 40, and the operating rod 3
Working air is sent to each of the two air nozzles 40 by operating a switching device (not shown) provided on the proximal side of the air nozzle 8. Also air nozzle 4
The tip 50 of the valve 0 is provided with an air hole to avoid contact with the valve stem 44 so that the air hole communicates with the valve stem 44 even when the tip 50 is in contact with the valve stem 44. A seal 58 is provided to prevent air from leaking from the gap in the valve seat 42 when the rod 44 is pressed.

Next, an example of how the clamp device 12 is used will be described, taking as an example a case where a pulley 100 as shown in FIG. 2 is attached. This pulley 100 is for carrying a plug (not shown) for blocking the nozzle 8 into the water chamber 2, as described in the conventional example.
It is integrally attached to the clamp device 12 and attached to the tube plate 6 at the approximate center within the water chamber 2 using the heat transfer tube 4 . That is, as shown in FIG. 3, the pulley 100 is carried from the manhole 10 to the tube plate 6 using the operating rod 38. At this time, the pulley 100 attaches the clamp device 12 to the operating rod 38 by fitting the air nozzle 40 into the valve devices 34 and 36 of the clamp device 12, and operates the operating rod 38 to connect the tapered shaft 20 of the clamp device 12 to the pipe. It is inserted into the heat exchanger tube 4 provided on the plate 6. The tapered shaft 20 is connected to the heat transfer tube 4
Once inserted into the cylinder chamber 16, a switching device provided on the proximal side of the insertion rod 38 is operated to send working air into the cylinder chamber 16 to push down the piston 18. When the piston is pushed down in this manner, the tapered shaft 20 is lowered accordingly, pushing the wedge portion 26 outward and fitting it into the heat exchanger tube 4. Since the working air is introduced into both cylinder chambers 16 of the tapered shafts 20 arranged in parallel as shown in FIG. 2, it is fitted in both the tapered shafts 20 at the same time. Once fitted, the operating rod 38 is pulled out, the air nozzle 40 is disengaged from the valve devices 34 and 36, and the operating rod 38 is removed. Even if the operating rod 38 is removed in this way, the valve devices 34 and 36 do not allow air to be released from the cylinder chamber 16 because the valve rod 44 is pressed against the valve seat portion 42 by the push spring 46. The fitted state by the tapered shaft 20 is maintained. To remove the clamp device 12, use the operation rod 38 to fit the air nozzle 40 into the valve devices 34 and 36, and feed working air so that the piston 18 rises.
Or conversely, let out the air so that it descends, and then press the tapered shaft 2.
0 to release the wedge portion 26 from the heat exchanger tube 4. Then, the tube plate 6 is attached to the operating rod 38.
You can try lowering it more.

FIG. 6 shows another embodiment of the clamping device, and this clamping device 70 is equipped with a spring 72 in one of the cylinder chambers 16, so that the spring 72 always presses the piston 74 in one direction. This is what I did. In this way, either the upward or downward stroke of the tapered shaft 20 is controlled by the spring 72.
Since the working air can be controlled only for one room, the configuration of the air control system can be simplified. The wedge portion, tapered shaft 20, etc. are the same as those of the first embodiment.

<Effects of the invention> As described above, according to the invention, since the clamping devices are actuated by working air, it is possible to operate multiple clamping devices at the same time. Since it can be operated by one person, the valve device and the operating rod can be separated, so there is no need to route piping inside the water chamber, and the water chamber can be used widely. can.

[Brief explanation of the drawing]

Figures 1 to 6 are related to the present invention;
2 and 2 are cross-sectional views showing one embodiment of the clamp device, FIG. 3 is a cross-sectional view showing the inside of the water chamber, FIGS. 4 and 5 are cross-sectional views and plan views showing the nozzle part, and FIG.
The figure is a sectional view showing another embodiment, FIGS. 7 to 9 are related to the conventional example, FIG. 7 is a sectional view showing the inside of the water chamber, and FIGS. 8 and 9 are sectional views showing the clamping device. It is a diagram. In the drawing, 2 is a water chamber, 4 is a heat exchanger tube, 6 is a tube plate, 1
0 is a manhole, 12 is a clamp device, 18 is a piston, 20 is a tapered shaft, 26 is a wedge portion, 34, 3
6 is a valve device, 38 is an operating rod, and 40 is an air nozzle.

Claims (1)

[Scope of utility model registration request] A wedge portion is provided on a side wall surface of an outer cylinder protruding above a base and is movable in and out, and is connected to an actuator integrally formed on the base to move in the axial direction within the outer cylinder. a tapered shaft that operates the wedge portion outward; a valve device that keeps the inside of the actuator airtight; and a nozzle that is provided at the tip of the operating rod and communicates with the nozzle hole of the valve device and can be removably inserted. A tool clamp device comprising: