JPS6344435B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pipe line for removing shellfish such as barnacles, seaweed, etc. that adhere to the inner wall of a circulating water pipe in a thermal power plant or a nuclear power plant that takes in seawater. This invention relates to a device for removing internal deposits.

[Prior art and its problems] Living things such as barnacles, purple shellfish, and algae grow and adhere to the inner walls of the circulating water pipes of thermal power plants that send seawater during operation. If these organisms are left unattended, they will grow further, narrowing the flow channel and causing fluctuations in water pressure, and if the grown barnacles fall off, they will enter the next important equipment along with the water supply, causing problems with operation. There is. To do this, they regularly drain water from the pipes, mobilize a large number of workers, and employ methods such as using so-called man-force tactics to scrape and remove living organisms. However, it requires a lot of time and effort under poor working conditions, and there are various problems, such as the fact that keren damages tar epoxy painted surfaces and coal tar enamel lining surfaces to prevent corrosion. , improvement of these problems has been strongly desired.

[Means for Solving the Problems] The apparatus for removing deposits in a pipe according to the present invention has been made in view of the above, and includes a trolley running in a circular pipe, and a telescopic vehicle installed on the trolley. an arm that is supported on the upper part of the support and rotates in a vertical plane perpendicular to the running direction of the trolley; and a jet nozzle that is installed at the tip of the arm and injects high-pressure water toward the inner surface of the pipe. , and is characterized in that the length of the extensible strut is adjusted to align the center of rotation of the arm with the centerline position of the conduit.

[Example] In the figure, 1 is a circulating water pipe with an inner diameter of 3000 mm, and the inner wall of the pipe is coated with tar epoxy coating or coal tar enamel lining 2 as shown in Fig. 4. . 3 shows a barnacle attached to its inner surface.

Thus, the trolley 5 that is self-propelled within the conduit 1 is equipped with two front wheels 6, 6 and two rear wheels 7, 7 made of rubber tires. Reference numeral 8 denotes an air motor fixedly installed on the underside of the truck in order to rotationally drive each of these wheels.Rotating shafts 9, 9 protruding from the air motor in the front and back direction are connected to gear boxes 10, 10, and the gear boxes 1
Axles 11, 11, 1 protruding from 0, 10 on both sides
2, 12 has a universal joint 13, 1
3, 14, 14 are interposed, which are the front two wheels 6,
6 and the rear two wheels 7, 7. 15,
Reference numerals 15, 16, and 16 are bearing members that rotatably support the two front wheels 6, 6 and the two rear wheels 7, 7 under the truck.
It is pivoted so that it forms a V-shape from the front as shown in the figure. That is, the two front wheels 6, 6 and the two rear wheels 7, 7 are supported by bearing members 15, 15, 16, 16, respectively, so that the cart 5 is stably supported within the conduit 1. The wheels are supported at an angle of about 15 degrees so that the distance between the two wheels widens on the ground contact side. Further, as shown in the plan view in Fig. 3, the axle of the two front wheels 6, 6 is supported by bearings 15, 15 inclined forward by about 3 degrees so that the distance between them is narrower in the front than in the rear. , On the contrary, the rear two wheels 7, 7 have their axles connected to the bearing part 1 so that the distance between them is narrower at the rear than at the front.
6 and 16 are supported with a backward tilt of about 3 degrees. Trolley 5
A column 17 is established at the center of the upper front part, and a telescoping column 18 that can expand and contract upwards is fitted into the column, and a rack tooth 19 is carved on one side of the column 18, and a rack tooth 19 is engaged with the rack tooth. A pinion is pivotally supported on the upper part of the column 17, and by rotating the pinion with a handle 20, the telescopic column 18 moves up and down, so that the height of the bearing body 21 fixed on the telescopic column can be adjusted. do. A width plate-shaped arm 22 is rotatably supported on the bearing body 21 so as to be rotatable in a vertical plane perpendicular to the traveling direction of the truck 5. Reference numeral 25 denotes an air motor fixed to the bearing body 21 for rotating the arm 22, and a rotary shaft 2 fixed to the center of the arm 22.
A sprocket 24 is fixed to the air motor 3, and the sprocket 24 and the sprocket 26 of the air motor are connected through a chain 27. Note that the rotation axis 2
3 is hollow and has a rotary joint 28 at one end, from which high-pressure water can be supplied toward a branch pipe section 36 provided at the other end on the arm 22 side. Attachment pieces 29, 29 are formed at both ends of the arm 22, and water supply pipes 30, 30 are fitted into the attachment pieces. Numerals 31, 31 are tightening screws of the mounting pieces 29, 29, and by loosening these screws, the mounting position of the water supply pipes 30, 30 can be adjusted. Water supply pipe 30, 30
Jet nozzles 32, 32 are provided at the tips of the jet nozzles 32, 32, and the jet nozzles 32, 32 can spray high-pressure water toward the inner surface of the conduit 1 toward the front and rear of the truck 5 by adjusting the angle from 0 to 90 degrees. . In addition, rotary joints 33, 33 attached to the base ends of the water supply pipes 30, 30, and a rotary joint 34 attached to the branch pipe section 36,
34 through flexible pressure-resistant hoses 35, 35, so that there is no problem in the supply of high-pressure water even when the mounting positions of the water supply pipes 30, 30 are adjusted. 37 is a cover plate erected on the trolley 5 to prevent water from scattering to the rear, 38 is a chair for tower passengers, and 39 is a jet nozzle 32, 32.
This is a control box that houses valves for regulating the high-pressure water supplied to the air motors 8 and 25, and valves for regulating the compressed air supplied to the air motors 8 and 25. Further, 40 indicates a drum provided on the upper rear portion of the truck 5 for winding a pressure hose for supplying high-pressure water and an air hose for supplying compressed air, and 41 indicates a handle for rotating the drum.

In the device configured in this way, first, the pipe line 1
The height of the telescopic column 18 is adjusted by operating the handle 20 so that the center of rotation of the jet nozzles 32, 32 is located on the center line O of the jet nozzle. Then, the trolley 5 is slowly moved forward along the pipe line 1 in the direction of the arrow by the drive of the air motor 8, and at the same time, the air motor 25 is driven to rotate the arm 22, and the jet nozzles 32, 32 at the tip are fed with 100 to 300 kg. / ^cm2 of pressure water is ejected. Jet nozzle 32, 32
Pressure water ejected from the pipe hits the inner surface of the pipe 1 and peels off the adhered substances such as barnacles, seaweed, and sand. In addition, in the experiment, the traveling speed of trolley 5 was
1.0~2.0m/min, the injection pressure of the jet nozzle is
The test was carried out at a pressure of 230 to 250 Kg/cm ² , a distance of 150 to 300 mm from the jet nozzle to the inner surface of the pipe, and a rotation speed of the jet nozzle of approximately 43 rpm. Removal rate 98
%) without adversely affecting the tar epoxy coating. In addition, because the jet nozzle has a forward spray angle of 35 to 45 degrees, there is almost no debris or water scattering toward the cart, and the debris is pushed forward through the pipe and does not interfere with the vehicle's forward movement. . Furthermore, this bogie has two front wheels and two rear wheels; the front two wheels have their axles slightly inclined so that the distance between them is narrower in the front, and the rear two wheels have their axles slightly inclined so that the distance between them is narrower in the rear. Of course, there are straight pipes,
Even if the pipeline is gently curved, the cart can always run stably along the pipeline without causing sideways slippage.

[Effects of the Invention] As described above with respect to the embodiments, the apparatus for removing deposits in pipes according to the present invention has an arm provided on the cart so that the height of the center of rotation can be adjusted by an extendable support. The nozzle can be rotated so that the center of rotation of the nozzle always coincides with the center line of the circular pipe according to the inner diameter of the pipe.
Therefore, even if the inner diameter of the pipes differs, the high pressure water ejected from the nozzle can be sprayed all over the inner surface of the pipe with uniform strength, and deposits such as barnacles can be efficiently removed in a short time. It is industrially useful because it can be easily removed and does not damage the inside of the pipe.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a front view of the device, Fig. 2 is a side view, Fig. 3 is a plan view, and Fig. 4 is an enlarged cross-sectional view of a part of the conduit. It is. 1... Pipeline, 5... Trolley, 6, 6... Front two wheels,
7, 7... Rear two wheels, 17... Support, 18... Telescopic column, 22... Arm, 32, 32... Jet nozzle.

Claims (1)

[Scope of Claims] 1. A bogie that travels in a circular conduit, an extendable column installed on the bogie, and a column that is supported by the upper part of the column and rotates in a vertical plane perpendicular to the running direction of the bogie. a jet nozzle that is provided at the tip of the arm and that injects high-pressure water toward the inner surface of the pipe, and adjusts the length of the extensible strut so that the center of rotation of the arm is aligned with the pipe. A device for removing deposits inside a pipe, characterized in that it is configured to be aligned with the center line position of the pipe. 2. The apparatus for removing deposits in a conduit according to claim 1, wherein the bogie has two front wheels and two rear wheels, and the front two wheels have an axle inclined such that the distance between the front two wheels becomes narrower toward the front.