JP4099268B2 - Pig type piping inner surface painting method by suction and internal pressure difference - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a coating method for applying a paint to an inner wall surface of a long pipe installed by burying or the like.
[0002]
[Prior art]
Conventionally, in order to apply paint to the inner wall surface of the pipe body, after applying the polishing treatment, compressed air is pumped from a compression device connected to one end of the pipe body, and an application body (pig) inserted into the pipe body is piped. It moved inside the body and applied the paint sent with the application body.
[0003]
[Problems to be solved by the invention]
In the above-mentioned coating method, since pressurized air is used, the apparatus becomes a large scale with a pressure resistant specification. When the valve body from the compression device is opened and compressed air is sent, the application body (pig) instantaneously jumps out of the tube body, and sufficient coating is not performed. Therefore, adjustment of compressed air is difficult and skill is required.
[0004]
[Means for Solving the Problems]
In view of such circumstances, the present invention is a simple device that uses suction air to address this problem. One end of a tubular body communicates with the atmosphere via a valve body, and the other end is a valve body. The application body that is connected to the vacuum device through the tube and inserted into the tube body is supplied with air corresponding to the negative pressure by the negative pressure generated by the suction of the vacuum device at one end. A coating method is provided in which the coating body is sequentially moved in the pipe repeatedly and the inner surface of the pipe body is coated with the paint sent into the pipe.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment for carrying out the pig type pipe inner surface coating method by suction and internal pressure difference of the present invention will be described with reference to the drawings.
Reference numeral 1 denotes an embedded tube body. One end of the tube body 1 is bent into a U shape, and a U 3 into which a required amount of paint 3 corresponding to coating and an application body (pig) 2 for applying the paint are inserted. The tubular body 1a is connected, and the tubular body 1a is connected to an air pipe 1b connected to the atmosphere via a valve body 4 at an end portion. The other end of the tube 1 is connected to a suction tube 1c having a huge portion 5, and the end of the suction tube 1c is provided with an open valve 6, and a vacuum device 8 provided with a valve 7 and a connectable tube. 9 is connected.
[0006]
The application body 2 inserted into the tube body 1a is moved into the tube body 1 together with the paint by the suction action from the vacuum device 8 and the air supplied by the valve body 4. At this time, the application body 2 in the tube body 1 is maintained in a stopped state with a good balance by stopping the vacuum device 8 and closing the valve body 4. Next, in order to perform the application work, a negative pressure is generated on the suction side of the application body 2 by the suction action by driving the vacuum device 8. The valve body 4 on the other side is opened with respect to the negative pressure, and air corresponding to the negative pressure is supplied. At this time, the application body 2 is pushed and moved to obtain a balance by supplying air. By repeatedly performing this suction operation and air supply intermittently, the application body sequentially moves in the pipe body, and paint is applied to the pipe body.
Furthermore, the coated body 2 after painting moves in the suction pipe 1c and moves to the enormous part 5, and then is received by the receiving pipe 10 having the concavo-convex part 10a on the end face and then opened by opening the release valve 6. Is released.
[0007]
【The invention's effect】
In the present invention, as described above, the inner wall surface of the pipe body is coated by sequentially moving the application body in the pipe body by supplying a pressure difference in the pipe body and supplying air in accordance with the pressure difference. It is simple without requiring skill, and has effects such as no spots on coating.
[Brief description of the drawings]
FIG. 1 is an overall schematic view of a pig-type pipe inner surface coating apparatus using suction and internal pressure difference according to the present invention.
[Explanation of symbols]
1 Buried pipe 1a U-shaped pipe 1b Vent pipe 1c Suction pipe 2 Pig (ball body)
3 Paint 4 Valve body 5 Enlarged part 6 Open valve 7 Valve body 8 Vacuum device 9 Connectable tube 10 Receiving tube a Receiving tube uneven portion

Claims (3)

It is a pig type pipe inner surface coating method that applies paint to the inner wall surface of a long pipe installed by burial, etc., with one end of the tube of the long pipe connected to the atmosphere via an on-off valve, and the other end is a valve Connected to the vacuum device through the body, the paint inserted in the pipe body and the application body to which the paint is applied are kept in a balanced state by stopping the vacuum device and closing the on-off valve, and then performing the coating operation In this case, a negative pressure is generated on the suction side of the application body due to the suction action by driving the vacuum device, and the open / close valve is opened with respect to this negative pressure, and air corresponding to the negative pressure is supplied. The pressure difference in the tube caused by suction from the vacuum device, which is pushed and moved to obtain a balance by the air supply, is corrected by the air supply, this operation is repeated intermittently, and the tube moves sequentially in the tube. Painting the inner surface of the tube Pig type pipe inner surface coating method according to the suction and pressure difference features. It is a pig type pipe inner surface coating method that applies paint to the inner wall surface of a long pipe installed by burial etc., and one end of the pipe body of the long pipe is connected to the atmosphere via an on-off valve, and the other end is enormous. A suction pipe provided with a section, and an end of the suction pipe is connected to a vacuum device via a valve body, and an applied body inserted into the pipe body is pressure generated in the pipe body by suction from the vacuum device. The difference is corrected by supplying air, this operation is repeated intermittently, and the inner surface of the tube body is coated by moving sequentially within the tube body. When the applied body moves to the enormous portion, it is received by the end surface of the receiving tube. The method of painting the inner surface of a pig type pipe by suction and internal pressure difference, characterized in that the receiving pipe is fixed to the side communicating with the vacuum device of the huge part so that the end surface is exposed inside the huge part . It is a pig type pipe inner surface coating method that applies paint to the inner wall surface of a long pipe installed by burial, etc., and is U-shaped downward so that paint can be collected at one end of the tube of the long pipe Connect the U-shaped tube that inserts the required amount of paint according to the coating and the coating body to which the paint is applied, and connect one end of the U-shaped tube to the atmosphere via an open / close valve. The end is connected to the vacuum device via the valve body, and the applied body inserted into the pipe body is corrected by the air supply to compensate for the pressure difference in the pipe body caused by suction from the vacuum apparatus, and this operation is repeated intermittently. Pig-type piping inner surface painting method by suction and internal pressure difference, characterized in that the inner surface of the tubular body is painted by moving sequentially within the tubular body.

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