JPS6236746B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for removing rust, cleaning and painting the inner walls of metal pipes, particularly buried cast iron gas pipes. Generally, gas pipes buried in cities are made of cast iron and have a diameter of 75 mm to 1200 mm, but generally about 76 mm.
The standard length is approximately 100 mm, and supply pipes, or branch pipes, are connected to each customer.

The gas that passes through the gas pipe, regardless of whether it is propane gas or city gas, usually contains moisture, so water droplets adhering to the inner wall of the pipe cause rust, which in turn causes pinholes to form in the gas pipe, leading to gas leaks. This would lead to an unexpected gas explosion.

Therefore, gas pipes are regularly inspected to check for gas leaks, but since they are buried underground, it is almost impossible to predict them accurately, so underground pipes are replaced based on predictions. It is also necessary from the standpoint of safety measures.

However, it is said to be difficult to remove buried gas pipes, even if they are 100 meters long, due to road traffic conditions.

The technical problem of the present invention is to automatically perform the rust removal process inside the gas pipe while it is buried, and then to collect and clean the rust and sand that have fallen into the pipe using a suction process installed at one end of the pipe. Then, the epoxy curing agent is applied evenly and uniformly inside the pipe.

The structure of the present invention, that is, the technical means for solving the above technical problem is as follows.

The inner surface coating device for metal pipes has a rotation biasing mechanism, an air rotary device, an air generation device, an air temperature adjustment device, a paint storage device, and a sand conditioning device. An air rotary device that applies rotational force to pressurized air is fixed to the rear end of the rotary biasing mechanism, and a first pipe for sand is disposed opposite to the rotary biasing mechanism. and a second pipe for paint are attached, the air rotary device is made of a cylindrical body, and a plurality of spiral grooves are formed on the inner periphery of the cylindrical body, and an air temperature adjustment device is installed at one end of the groove. An end of a cooling pipe is attached to the cooling pipe, a proximal end of an air control duct is connected to one end of the air generator, one end of a branch pipe is connected to the control duct, and the branch pipe is connected to the other end of the air control duct. metal, characterized in that the end has a connection to a branch pipe of a gas pipe, and the air generator is connected via a main pipe to a sand conditioning device, an air temperature conditioning device and a paint storage device Located in the pipe inner coating equipment.

About the operation: We excavate the minimum number of vertical holes necessary for the work at the front and rear connections of the pipes that transport gas, inspect the inside of the gas pipes through the shaft, examine the condition of the inner walls of the pipes, and then investigate the condition of the pipes buried underground. Since the inner wall of the gas pipe can be automatically cleaned, sucked, and painted, there is no need to dig up the road, and since the painting can be done in a short time, it can be done even in areas with poor traffic conditions. .

Preferred examples of embodiments of the present invention will be explained based on the drawings.

Reference numeral 10 shows the entire rotary biasing mechanism having a roughly trumpet-shaped cross section for supplying pressurized air. An air rotary device 15 that applies rotational force to pressurized air is screwed and fixed to the rear end 14 of the rotary biasing mechanism 10.

Furthermore, one ends 20 and 21 of at least two first pipes for sand 16 and second pipes for paint 17 are respectively attached to connecting pipes 18 and 19 facing each other at required locations of the rotational biasing mechanism 10, and The other end 22 of the first pipe 16 is connected to the connecting pipe 25 of the sand conditioning device 24, and the other end 23 of the second paint pipe 17 is threaded into the tip opening 26 of the air temperature mixing room 41.

Both ends of the first pipe 16, that is, the front and rear end sides 20,
22 is provided with valves 27 and 28, and a valve 29 is provided on the front end side of the second pipe 17.

The air rotary device 15 is a cylindrical body as shown in FIG.
The inner circumference 3 from the end face 30 located inside and exposed to the outside
1, 45 degree inclined grooves 32 to 35 are formed at predetermined intervals.

Cooling pipes 37 to 40 branched from a main pipe 36 are attached to the inclined grooves 32 to 35, respectively, and the main pipe 36 is connected to an air temperature adjusting device 8 having a cooling device using Freon gas.
It is connected to the connecting pipe 43 of No. 8.

The mixing room 41 is generally box-shaped as shown in FIGS. 3 to 5, and its front end is connected to the second pipe 17, and its rear end is connected to the tip of a flexible hose 42.

Then, a side wall 56 on the side of the flexible hose 42
A through hole 48 is formed in the through hole 48, and compressed air guide passages 43, 44 are formed by semicircular partition walls 51, 52 integral with partition walls 49, 50 that partition the through hole 48 vertically and horizontally.
are formed on the left and right, and the compressed air guide passages 43,
Half-moon-shaped guide blades 45 and 46 whose diameter is gradually reduced in the box axis direction from 44 are fitted into the tip of a flexible hose 42 which is formed to protrude left and right across a partition wall 47.

The front end duct 53 of the mixing room 41 is twisted somewhat clockwise relative to the mixing room main body, as shown in FIG.

Reference numeral 42 denotes a flexible hose, the rear end of which is connected to the open end of the paint storage device 61 via a lock ring 88, and the internal mechanism includes the partition walls 49, 50 and the semicircular partition wall 5 as described above.
1 and 52 to form a double structure, and left and right compressed air guides 43 and 44, a base agent passage 54, and a base hardener passage 55 are formed on the left and right sides.

Reference numeral 58 denotes a paint storage device, and the device 58 is composed of an outer box 61 and an inner box 62 with a gap 63 on the left and right sides, and the inner box 62 is separated from the main agent storage chamber 59 and the curing agent storage chamber 60 by a partition wall 66 on the left and right sides. separated into

A pipe 64 for feeding compressed air is attached to a through hole in the rear wall 65 of the outer box 61 of the paint storage device 58, the lower half of the pipe 64 is cut off so that it flows into the gap 63, and the upper half of the dome 65 is cut off. is inner box 62
It is inserted inward and upward.

67 and 68 are caps of the inner box 62.

69 is an air generating device such as a compressor, and compressed air pipes 70, 71,
72 and main pipe 73 are valves 74, 7
5 and 76.

One end of the main pipe 73 is connected to the paint storage device 58 through a pipe joint 77.

Reference numeral 78 denotes a cleaning liquid storage device, which is connected to the pipe fitting 77 via a pipe 79.

Reference numeral 80 denotes an air pressure control duct, one end of which is connected to the air generator 69, and branch pipes 81, 81 are connected to required locations of the duct 80.
... are provided, and the branch pipes 81, 81 are connected to branch pipes 82, 82... from the gas pipe 13.

Therefore, by blowing air into the gas pipe through the duct 80 and the branch pipe 81, it is possible to prevent paint from entering when painting the inner surface of the gas pipe 13.

Reference numeral 83 denotes a dust collecting device, and the dust collecting port 84 of the device 83 is attached to the open end side of the gas pipe 13.

Describe the work process.

First, when the air generator 69 is started, air (compressed air) is sent from the air temperature adjustment device 88 to the air rotary device 15 of the rotational biasing mechanism 10 via the main pipe 36 and branch pipes 37 to 40. Rotational force is applied by the inclined grooves 32 to 35 of the rotary device 15 as indicated by arrows a, b, c, and d and is sent to the gas pipe 13.

Next, valve 1 of the first pipe 16 for sand
7 and 28, and then sand adjustment device 2.
When the valve 74 on the fourth side is opened, the sand is pushed out and supplied into the rotation urging mechanism 1 through the first pipe 16.

The sand subjected to rotational force by the air rotary device 15 collides with the inner wall of the gas pipe 13 and moves forward along the wall surface, peeling off the rust on the inner wall of the pipe and falling. Sand that has fallen onto the inner wall of the gas pipe 13 is sucked and cleaned by the dust collector 83.

Next, the air valve 74 of the sand conditioning device is closed to stop the flow of air.

Next, the valves 85 and 86 in front of the paint storage device 58
When the valve 29 of the second pipe 17 for sending out the paint is opened at the same time, the main agent, such as epoxy resin paint, is pushed out to the left side of the flexible pipe 42 (paint transport pipe) by the air.
At the same time, the hardening agent is on the right side of the flexible pipe 42.
The paint and curing agent are mixed and sent into the mixing room 41 by the flow of air passing outside the guide blades 45 and 46 formed at the tips of the paint and curing agent.

The material fed into the mixing room 41 is fed into the rotation urging mechanism 10 through the second pipe 17 in this state.

The paint sent into the rotary device 15 of the mechanism 10 is given a rotational force by the rotating air of the rotary device 15, and moves forward while adhering to the inner wall of the gas pipe 13, and the paint accumulated on the inlet side. The moving air is promoted by the rotating air and reaches the end of the gas pipe 13, completing a uniform coating.

Confirm the completion of the paint and use the second paint feeder.
The valve 29 of the pipe 17 is closed, and then the valves 85 and 86 on the main pipe 73 side are closed.

Subsequently, the valve 76 of the air temperature adjustment device 88 is closed, and the air generation device 69 is further turned off.

As mentioned above, according to the device of the present invention, it is now possible to paint the inside of buried pipes, which was conventionally considered impossible, by simply digging work holes on both sides of the gas pipe. can be inspected, so the condition of the paint lining can be easily confirmed.

FIG. 12 shows another embodiment of the air rotary device, in which a plurality of partition plates 90, 91, 92 twisted at about 180 degrees are arranged and fixed on the inner surface of a cylindrical body 89, shifted by 90 degrees.

A part of the energy of the flow of the compressed air sent is used to apply rotational force as shown by the arrow.

The main pipe 36 is directly attached to the cylindrical body 89.

In addition, rotational feeding of sand to clean the inside of the pipe,
The rotational feeding of paint can be carried out using only compressed air as the power source, so incidental equipment such as compressors such as booster pumps and rotary pumps should be installed on the ground, and pipes for compressed air feeding and sand feeding should be installed on the ground. It is only necessary to connect the pipe and the paint feeding pipe to the air rotary device in the rotary urging mechanism, which helps reduce the operating cost of the inner surface coating device for metal pipes.

Next, after the painting is completed, the rotation biasing mechanism 10 is
At the same time, the flexible pipe 42 is removed from the paint storage device 58, and the flexible pipe 4
2 is connected to the pipe joint 77, and a cap is fitted to prevent the paint from flowing out from the paint storage device 58.

Thereafter, when the cleaning liquid is supplied from the cleaning liquid storage device 78, the flexible pipe, the mixing pipe, the second pipe, and the inside of the rotation urging mechanism 10 are cleaned in this order.

Therefore, it is possible to achieve an effect that does not hinder the reuse of the device of the present invention.

[Brief explanation of the drawing]

Fig. 1 is an overall explanatory diagram of the device of the present invention, Fig. 2 is a perspective view of the main air rotary device of the device of the present invention,
Fig. 3 is an overall view of the main mixing room of the apparatus of the present invention, Fig. 4 is a partially sectional perspective view of Fig. 3, Fig. 5 is a right side view of Fig. 3, and Fig. 6 is a diagram of the apparatus of the present invention. 7 is a right side view of FIG. 6, FIG. 8 is a partially sectional perspective view of FIG. 6, and FIG. 9 is an overall view of the main part of the paint storage device of the device of the present invention. ,
Fig. 10 is a right side view of Fig. 9, Fig. 11 is a partially sectional perspective view of Fig. 9, and Fig. 12 is a sectional view showing another embodiment of the air rotary device of the main part of the device of the present invention. . 10: Rotation biasing mechanism, 13: Gas pipe, 15, 8
9: Air rotary device, 24: Sand adjustment device, 41: Air temperature mixing room, 69:
Air generator, 61: Paint storage device, 89: Air temperature adjustment device.

Claims (1)

[Claims] 1. Below (a). (B). (c)． (d). An apparatus for coating the inner surface of metal pipes, characterized by meeting the conditions (E) and (F). (a) The inner surface coating device for metal tubes includes a rotary biasing mechanism 10, an air rotary device 15, an air generator 69,
It has an air temperature adjustment device 88, a paint storage device 58, and a sand adjustment device 24. (b) The rotary biasing mechanism 10 has a fitting part for the gas pipe 13 at its tip, and an air rotary device 15 that applies rotational force to pressurized air is fixed to the rear end of the rotary biasing mechanism 10. That's what I'm doing. (c) A first pipe 16 for sand and a second pipe 17 for paint are attached to the rotation biasing mechanism 10 so as to face each other. (d) The air rotary device 15 is made of a cylindrical body, and the inner periphery of the cylindrical body is provided with a plurality of spiral grooves 32 to 32.
35 are formed, and the ends of cooling pipes 37 to 40 connected to the air temperature adjustment device 88 are attached to one end of the grooves 32 to 35. (e) A base end of an air control duct 80 is connected to one end of the air generator 69, one end of a branch pipe 81, 81... is connected to the control duct 80, and the other end of the branch pipe 81, 81... Having a connection to the branch pipe 82 of the gas pipe 13. (f) The air generator 69 is connected to the main pipe 73
be connected to the sand conditioning device 24, the air temperature conditioning device 88, and the paint storage device 58 via.