JPS6151951B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a pipe inner surface coating machine, and in particular, a coating nozzle moving inside the pipe is always pressed against the inner surface of the pipe, thereby improving the curved shape and diameter of the pipe. This invention relates to a pipe inner surface coating machine that can reliably coat the inner surface of a pipe regardless of its length.

TECHNICAL BACKGROUND OF THE INVENTION In recent years, in rotating equipment and the like, it has been required to completely coat the inner surfaces of piping with anti-rust coating to extend its life and improve reliability. The inner surface of piping cannot be painted with a brush or spray, so
In the past, flow coating was generally performed, in which paint was poured into a pipe.

Problems with the background technology However, with this type of flow painting, the paint often does not spread sufficiently, especially to the curved parts of the pipe, and there are often unpainted areas, and rust occurs in the unpainted areas.
The life of the tube was getting shorter.

OBJECT OF THE INVENTION Therefore, an object of the present invention is to provide a tube inner surface coating machine that can reliably and easily coat the inner surface of a tube.

SUMMARY OF THE INVENTION In order to achieve the above object, a pipe inner surface coating machine according to the present invention has a nozzle base attached to the end of a paint supply hose arranged substantially along the pipe axis of piping, and a nozzle base attached to the nozzle base. A plurality of tip nozzles that are pressed outward in the radial direction with The tip nozzle is moved in a state in which the tip nozzle is always in contact with the inner surface of the tube.

Embodiments of the Invention Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

As shown in FIGS. 1 and 2, a paint supply hose 1 of a pipe inner surface coating machine according to an embodiment of the present invention is as follows:
It is made of a long flexible material and is fitted inside the coil spring 2. This coil spring 2 increases the rigidity of the paint supply hose 1. A hollow nozzle base 3 is connected to one end of the supply hose 1. A plurality of openings 3a, 3a, . . . are formed in the nozzle base 3, and the openings 3a, 3a, . One end side of each nozzle hose 4, 4, . . . is connected to each of the openings 3a, 3a, . That is, each nozzle hose 4, 4,...
They are arranged radially around the tube axis of the paint supply hose 1. This nozzle hose 4 is made of a flexible material and is expandable and contractible in its longitudinal direction. Further, a coil spring 5 is embedded in the pipe wall of the nozzle hose 4, and the nozzle hoses 4, 4, . . . are extended radially by the force of the spring. Furthermore, each of the nozzle hoses 4,
Tip nozzles 6, 6, . . . are attached to the tip portions of 4, . . . , and each tip nozzle 6, 6, .
Further, a tube inner surface contact piece 7 is attached to the front surface side of the tip nozzle 6. This tube inner surface contact piece 7
is made of a porous elastic body having fluid permeability, such as a sponge, and the outflow ports 6a, 6
It covers a,... In addition, this tube inner surface contact piece 7
is formed in the shape of a front circular arc (see Figure 1), and has a constant cross-sectional shape in the circumferential direction of the circular arc, and its cross-sectional shape is also formed in a circular arc shape (see Figure 2). , so that it can be comfortably abutted along the inner surface of the pipe.

Further, one end side of an elongated support piece 8, 8,... is fixed to the tip nozzle 6, 6,..., and the length of the support piece 8, 8,... is the same as the length of the nozzle hose 4. The support pieces 8, 8, . . . are arranged radially along the direction. Further, each of the support pieces 8, 8, . . . is provided with a long hole 8a extending in the radial direction. On the other hand, a pin 9 is provided protruding from the tip end surface 3b of the nozzle base 3,
The long holes 8a of the support pieces 8 are loosely fitted into the pins 9, respectively. Therefore, this support piece 8,8,
..., the tip nozzles 6, 6,... are restrained and supported in the axial direction of the paint supply hose 1 by the pin 9 and the tip surface 3b of the nozzle base 3, and can freely reciprocate in the radial direction. ing.

In this embodiment, the spring 5 is formed integrally with the nozzle hose 4, but it is also possible to attach a completely separate spring to the outside or inside of the nozzle hose 4.

The tube inner surface coating machine constructed as described above is used as shown in FIG. That is, the paint supply hose 1 of the pipe inner surface coating machine is inserted into one end of the piping 10 to be painted, and while feeding the paint into the paint supply hose 1 from the other end, the hose 1 is pulled, and the tip nozzle 6 , 6, ... are moved while in contact with the inner surface of the tube. At this time, the tip nozzles 6, 6, . . .
... and is pressed in the radial direction by the springs 5, 5, ..., so the piping to be painted 10
Each tip nozzle 6, 6, .
is pressed against the inner surface of the pipe 10 to be painted and always maintains a state of contact. Furthermore, in this case, the tip nozzles 6, 6, . . . are supported by the support pieces 8, 8, .
Because it is attached to the tip nozzle 6, 6,
... will not fall down in the axial direction of the pipe 10, and the abutting state will be maintained reliably.

Further, from the paint supply hose 1 to the nozzle base 3
The paint sent to each nozzle hose 4, 4,...
through the tip nozzles 6, 6, . . . and is discharged from the outlet 6a, 6a, . It adheres to the inner surface of the pipe 10.
As mentioned above, the tip nozzles 6, 6,
...is always in contact with the inner surface of the tube, so the painting is done seamlessly.

Note that the paint supply hose 1 has a coil spring 2.
Because the rigidity is increased, even in a curved part as shown in Fig. 3, the shape follows the axis of the pipe 10 to be painted, and the paint supply hose 1 comes into contact with the pipe wall and pulls the hose 1. It will never stop happening.

Further, a pipe inner surface coating machine according to another embodiment of the present invention shown in FIG. 4 is provided with a large number of tip nozzles so that the nozzles come into contact with the entire circumference of the inner surface of the pipe to be coated. In this embodiment, two groups of tip nozzles arranged radially are provided, and each tip nozzle group is similar to the above-mentioned embodiment, but each of the tip nozzles is connected to one paint supply hose.
They are provided so as to be offset from each other in the tube axis direction and in the direction around the tube axis. That is, the front end nozzles 16, 16, . . . on the left side in FIG. The portion left unpainted in step 16 can be painted with rear nozzle 26. In this way, the entire circumference of the inner surface of the tube can be painted in one painting operation,
Very convenient.

Effects of the Invention As described above, the present invention has a tip nozzle that is pressed against the inner surface of the piping to be painted by a spring force at the tip of a paint supply hose, and a tip nozzle that is pressed against the inner surface of the piping to be painted by a spring force. The inner surface of the pipe is coated by moving the nozzle while it is constantly in contact with the inner surface of the pipe, so there is no need to worry about bends in the pipe being painted, changes in diameter, or long pipes. The inner surface of the pipe can be easily and reliably painted, effectively preventing the occurrence of rust on the pipe, extending its life, and improving the reliability of the pipe.

[Brief explanation of the drawing]

Fig. 1 is a front view of a pipe inner surface coating machine according to an embodiment of the present invention, Fig. 2 is a sectional view taken along the line AA in Fig. 1, and Fig. 3 is a use of the pipe inner surface coating machine shown in Fig. 1. A sectional view showing the state, and FIG. 4 is a side view of a pipe inner surface coating machine in another embodiment of the present invention. 1, 11...Paint supply hose, 3...Nozzle base,
4... Nozzle hose, 5... Coil spring, 6, 16,
26...Tip nozzle, 8...Support piece.

Claims (1)

[Scope of Claims] 1. A nozzle base attached to the end of a paint supply hose, a plurality of telescopic nozzle hoses extending radially from the nozzle base, and a nozzle attached to the tip of each nozzle hose. a plurality of tip nozzles, a nozzle pressing device that presses each of the tip nozzles outward in a radial direction, and a nozzle support that supports the tip nozzles in the axial direction of the paint supply hose and is movable in the radial direction. A pipe inner surface coating machine characterized by comprising: 2. The pipe inner surface coating machine according to claim 1, wherein the nozzle pressing device comprises a plurality of coil springs installed radially between the nozzle base and each tip nozzle. 3. The pipe inner surface coating machine according to claim 2, wherein the coil spring is embedded inside a pipe wall of the nozzle hose. 4. The nozzle support device includes a plurality of support pieces arranged radially around the nozzle base and having long holes formed in the radial direction, and the long holes of the support pieces protrude from the nozzle base. 4. A tube inner surface coating machine according to claim 1, wherein the support piece is loosely fitted onto a supporting pin, and a tip end portion of the support piece is fixed to the tip nozzle.