JPS58166975A - Tank washing apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] This invention is applicable to various storage tanks and water tanks (hereinafter referred to as tanks).

), particularly regarding a cleaning device suitable for cleaning tanks used as nuclear power generation equipment for decontamination.

At nuclear power generation facilities, during regular tank inspections, the inside of the tank is cleaned and decontaminated as a preliminary cleaning. The tank is approximately 3. ,
The height is approximately 5 vs., and conventionally, a worker holds a spray nozzle that sprays high-pressure cleaning water, enters the tank through an opening on the top, such as a manhole, and sprays high-pressure cleaning water to clean the inside. This poses the problem of workers being exposed to radiation from spraying water sprayed onto the inner walls, and also causing uneven cleaning. There is also a method of using a rotating nozzle, but the distance between the nozzle and the surface to be cleaned is long and the cleaning effect is poor, and the entire inner surface can be cleaned evenly within a fixed period of time. There are no drawbacks.

Therefore, in the present invention, separate nozzles are used to clean the side inner surface and the bottom surface of the tank, and the nozzle for cleaning the inner 11 surfaces is installed at the free end of the radial arm that can be opened and closed like an umbrella. It is lowered inward through a narrow manhole on the top surface, and after being lowered, it is opened in a radial shape inside and the nozzle is brought close to the inner circumference.This allows the nozzle that cleans the bottom surface to be separated and the entire inner surface of the tank to be cleaned within a certain period of time. The cleaning is done evenly, and will be explained below with reference to one embodiment shown in the drawings.

/ indicates a tank, and /' indicates a small manhole opening in the center of the top surface. The cleaning device of the present invention includes a base body that is fixedly installed on a manhole, a drive part 3 that is rotatably supported by the base body and whose center of rotation can be aligned with the axis of the tank, and a drive part 3 that is attached to the bottom surface of the drive part. It is installed vertically concentrically and has a main shaft that hangs halfway into the tank.

In this embodiment, the base body 3 has a hollow spiral shape, and the drive unit 3 has a cylindrical shape that penetrates the base body in the vertical direction and rotatably supports an IC. A forward/reverse motor S1 built into the base can be rotated in forward and reverse directions. The motor S is reversed by a limit switch that operates when the drive part rotates, for example, half a turn.When the motor S rotates in the opposite direction and the drive part rotates half a turn again, the direction of rotation O is changed again by the IJ Mitswitch, and the rotation direction is changed at a predetermined angle. Rotates back and forth.

A clamp-shaped elevating portion 6 is fitted onto the outer periphery of the main shaft.

The elevating part has an inner keyway, and nine protrusions arranged in the axial direction on the outer periphery of the main shaft engage with this keyway, so that it only moves up and down along the main shaft. On the outer periphery of the elevating part, there are two radial arms spaced apart in the circumferential direction. ,? One end is pivoted so that it can be opened and closed radially,
Each of the radial arms has a nozzle l attached to its other end. The reason why there are two radial arms is because the reciprocating rotation angle of the drive section is 1806.

Each radial arm opens and closes radially by inserting its base into a pair of support pieces and levers provided outside the elevating section, and when raised upward, approaches the side of the main shaft and closes.

Each supporting piece! ,! The pairs have matching holes so that the bottle IO can be passed through from the side, and the radial arms are roughly perpendicular to the main axis, and the bottle 10 is received from below when fighting horizontally. When the bottle 10 is pulled out, it can be pushed diagonally downward K by the stopper /l between the support pieces, and when the elevating part is lowered to the lower end of the main shaft, the nozzle 5 is directed toward the lower end of the inner periphery of the tank. Therefore, the angle α at which the stopper l/opens the radial arm diagonally downward is the height K from the bottom of the tank to the lower end of the main shaft.
Therefore, the length of the radial arm is determined so that when it is opened horizontally, the tip is close to the inner peripheral surface of the tank.

Further, the main shaft has a swinging arm 7 having a nozzle saw attached to one tip thereof pivotably mounted on the lower end thereof. The length of the swinging arm/3 is also determined according to the height from the bottom of the tank to the lower RAT of the main shaft, and the tip is set close to the bottom.

Inside the drive unit JVi, there are built in seven rolls of rounded wire ft/j for vertically moving the elevating unit 1, and a drive unit /4 for swinging the swing arm /3.

The hoisting device 15 includes a motor with a reducer /3α and two drums /1' and /3 attached to both ends of the output shaft of the reducer.
j', which is installed on the frame 17 that straddles the motor and reducer of the drive device 14, and is connected to the image drum/! '.

/! 'The ends of each I/C wound wire/da go down from the two holes on the lower surface of the drive and are connected to two points in the diametrical direction of the upper end of the lifting part, and are raised and lowered by winding and unraveling the wires of both drums. move the part up and down. Further, the output shaft of the reducer of the drive device 14 is directed downward toward the hollow my of the main shaft, and the intermediate shaft /l is connected to the tip in an extended manner.

In this embodiment, the swinging arm /J is a worm transmission mechanism in a gearbox /9 fixed to the lower end of the main shaft. The upper end of the intermediate shaft is connected to the shaft of the worm wheel, so the lower end of the intermediate shaft is connected to the shaft of the worm through the universal bolt, and the rotation of the motor causes the worm to move the worm wheel. Turn to swing the swinging arm.

K performs decontamination, before fixing the substrate in the tank, connect hose V to each nozzle, l for supplying cleaning water or, in the case of wet blast cleaning, ice or dry ice granules. A pair of supporting pieces? ,? All of the bottles are set up as KA, and the bottles 10 and VC are each connected with a long wire rope. And radiant arms! Raise the ... upward, squeeze it into the main shaft rotation, and lower the swinging arm and main shaft into the interior through the manhole /'. From this K, the radial arm opens horizontally into the link as the upper layer passes down through the manhole until it is received by the bin 10. After descending in this way, place the base on the manhole, align the center of the main axis with the center of the tank, tighten the base to the manhole with bolts, etc., and then pull up the elevating part, for example, and connect the nozzle t at the tip of the horizontally opened radiating arm. Point it at the top of the inner surface of the tank. In addition, pull the hose and wire rope out of the tank through the appropriate through-hole in the base.
The hose is connected to a pressure pump that supplies cleaning agent.

Then, the drive unit rotates the shaft reciprocatingly, for example, after the forward movement is completed and before the backward movement, or after - or several reciprocating rotations, it is applied to each nozzle with a diameter equal to the diameter of the cleaning zone on the inner surface of the tank. The lifting part moves from E to the bottom or from the bottom to the top at a slightly smaller pitch, and the swinging arm moves in the diametrical direction of the bottom of the tank, or at a similar pitch during reciprocating rotation. Cleaning is performed by spraying cleaning agent from each nozzle.

Of course, the movement of the elevating section is performed by intermittently rotating the drum of the hoisting device/S, winding up and unwinding the wire/4, and moving the swinging arm by rotating the drum of the hoisting device/S. Initially, it was extended from the lower end of the main shaft and the bottom one was facing the center of the main shaft, but when it was swung in the radial direction and the pressure reached the outer shoulder of the bottom, it was then turned back and diametrically crossed the center of the other side. It is oscillated until it faces the outer periphery and then returned to the center again.The motor of the drive device is intermittently rotated in forward and reverse directions, and this is done by a worm transmission mechanism.These movements are controlled by an external source near the tank. A piezoelectric computer was brought in, and the power supply to each motor of the hoisting device lj1 drive device/6 could be controlled automatically and accurately using this computer.

When the radial arm opens horizontally from the lifting part, cleaning of the inner circumferential surface can be done from the upper end to the lower end of the main shaft, and cannot be done from there to the lower end. Wind the wire 4 (on the lower end of the drum) and once pull up the lifting part, connect it to the 12 bin 10, pull the 9 wire rope N out of the tank, and remove it from each pair of support pieces. Open the radiation arm diagonally downward by its own weight.The lifting amount of the lifting part is such that the radiation arm opens diagonally downward and the nozzle t at the end of the radiation arm is directed towards the area that was last cleaned when the radiation arm is horizontal. Good. Angle a when the radial arm opens diagonally downward.
Since is regulated by the stopper l/ and is constant, the lifting lid for lifting the elevating part by that amount is already known, so this can also be stored in the computer and performed by the computer.

When the radial arm opens diagonally downward in this way, operation is restarted, the elevating section is lowered to a predetermined pitch, and the reciprocating rotation of the main shaft causes the nozzle at the tip of the radial arm to open the lower end of the inner peripheral surface, that is, the nozzle at the tip of the swinging arm. Clean all the way to the outer periphery of the bottom that has been or will be cleaned.

Cleaning of the inner circumferential surface by the nozzle at the tip of the radial arm and cleaning by the nozzle at the tip of the swinging arm can be performed at the same time. Since it is the bottom that is most contaminated, it is suitable to perform wet blast cleaning by spraying small pieces of ice or the like from the nozzle at the tip of the swinging arm.

After cleaning the inner circumferential surface and bottom of the tank, point the swinging arm straight to the extension of the main shaft, pull up the lifting section until the radiating arm can be raised upwards, and use the hand hook rod from the top of the manhole. Insert the radial arm that opens diagonally downward, raise it upward, and then pull it up again to reach the drive section IIK, or connect each radial arm with All you have to do is connect the wire rope and place it outside the tank, remove it from this fill, remove the whole thing outside and collect it.

As is clear from the above, according to the present invention, the worker can perform cleaning without entering the beam, thereby greatly reducing the amount of radiation exposure. Cleaning is performed by combining the reciprocating rotation of the main spindle with -, and by appropriately setting the pitch of vertical movement and rocking, the entire surface of the paper can be cleaned evenly, and areas that have already been cleaned can be cleaned again. Cleaning agents (cleaning water or Wet Plus 1) can be avoided.
The amount of radioactive cleaning waste is reduced, and the working time is also shortened. Furthermore, due to the reciprocating rotation, there is no damage to the cord that supplies power to the motor in the drive unit or the high-pressure hose that supplies cleaning agent under pressure to the nozzle.

In this embodiment, the drive unit and the main shaft reciprocate by 180°, so two radial arms and one swinging arm can clean the entire inner peripheral surface and bottom surface with a 180° phase. In the case of reciprocating rotation, it is sufficient to provide four radiating arms with a phase of 90@ and two swing arms with a phase of 90'. In addition, the main shaft is removably fixed to the lower surface of the drive unit, and the swinging arm including the gearbox is removably fixed to the tip of the main shaft, and when cleaning tanks of different heights, it can be attached to the tank. All you have to do is replace the main shaft and intermediate shaft with matching lengths and clean them, and if the tanks are about the same diameter, you can clean all tanks of various heights just by replacing the main shaft and intermediate shaft.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a front view of the same vehicle during cleaning, and FIG. 2 is an enlarged vertical side view of a part of the same vehicle. 7' is the manhole, ko is the base,
3 is the driving part, q is the main shaft, 6 is the lifting part, 7 is the radiation arm, g,
/C indicates a nozzle, /J indicates a swinging arm. Patent applicant: Kurita Kasarai Co., Ltd. Agent: Patent attorney Fuku 1) Nobu Yukuma Agent:
Patent Attorney Fuku 1) Takeshi Week Agent Patent Attorney Fuku 1
)Ken 3 Figure 2

Claims (1)

[Claims] a drive part that is rotatably supported by a base fixed to an opening on the top surface of the tank around a rotation center in the same direction as the axis of the tank and rotated back and forth; a main shaft that hangs down into the tank from the bottom surface of the drive part; An elevating part that fits into the main shaft and can be moved downward along the main shaft, a radial arm that is pivoted at one end on the elevating part and can be opened and closed in a positive radial manner, and has a nozzle at the other end; 1. An evening washing device characterized by comprising a swinging arm having one end pivotally supported at the tip, a nozzle at the other end, and connected to the drive section for swinging.