JPS626867B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] When water pipes become obsolete, over the course of years of use, rust forms on the inner surface in the form of bumps, and the inner diameter becomes extremely narrow, causing problems in water supply. In addition, turbid water called red water is generated, which is unfavorable from a sanitary standpoint. Therefore,
Old water pipes are being regenerated by cleaning their inner surfaces and then painting them with resin.
The invention thus relates to a method for lining the inner surface of pipelines, such as water pipes, with paint.

[Conventional technology]

FIG. 6 shows a known lining method described in Japanese Patent Publication No. 46-4990, in which A is a longitudinal cross-sectional view and B is a cross-sectional view of FIG. Reference numeral 1 designates a pipeline such as a water pipe, through which a lining device 4 consisting of a motor M, a mixer 2 driven by the motor M, and a cylindrical rotor 3 runs.
That is, by pulling with the wire 5, the lining device 4 runs at a constant speed in the direction of arrow _a1 . Usually, the paint uses a main agent such as an epoxy resin and a curing agent, which are mixed in the lining device 4 and immediately applied for painting. In the illustrated example, the main agent is supplied from the supply pipe 6 and the curing agent is supplied from the ground through the supply pipe 7, mixed by a mixer 2 driven by a motor M, and then supplied to a cylindrical rotor 3 also driven by the motor M. Ru. Since many injection holes 8 are opened in the peripheral wall of the cylindrical rotor 3, when the cylindrical rotor 3 rotates at high speed, the mixed resin is injected from the injection holes 8 due to centrifugal force, and the inner surface of the pipeline 1 is coated. be done.

[Problem that the invention seeks to solve]

However, when lining is performed using centrifugal force in this manner, as shown in FIG. 2, the resin does not reach the shaded portions 10 such as the tips of the water distribution pipes 9, and there are places where lining cannot be performed. Therefore, first, the cylindrical rotor 3 is rotated in the ₂ directions of arrow a for painting, and then the lining device 4 is passed through the pipeline 1 again, and this time the cylindrical rotor 3 is reversed and rotated in the ₃ directions of arrow a. is proposed. i.e. arrow
a The above 10 parts are painted by rotating in ₃ directions.

However, in this method, the lining device 4
It has to be passed through twice, requiring twice the number of man-hours and increasing costs. Furthermore, if the first coating is not dried, marks from the legs 11 that serve as guides will be generated on the painted surface when the lining device 4 is run for the second time. Therefore, it is necessary to wait until the first lining is dry, which increases the construction time, so we have to extend the water cutoff time.
The inconvenience to consumers is enormous. Due to these drawbacks, two coats are also impractical, especially for urban water supplies.

The technical problem of the present invention is to solve these problems in the conventional method of lining the inner surface of a pipeline, and to solve the problem by simply passing through the lining device once.
The purpose is to make it possible to paint the inner surface of a pipeline from both the forward and reverse directions.

[Means for solving problems]

The technical means of the present invention taken to solve this problem is to move the lining device in the pipeline and spray the paint using the centrifugal force of the centrifugal coating means. In this method, two centrifugal coating means are provided, and each centrifugal coating means is rotated in opposite directions to inject paint onto the inner surface of the pipeline from different directions.

[Effect]

According to this technical means, two centrifugal coating means such as cylindrical rotors are provided, and since they rotate in opposite directions, centrifugal force is applied when spraying paint from the injection holes in the peripheral wall of the cylindrical rotor. The direction of the force is completely opposite. Therefore, when painting with one cylindrical rotor, even if a shadow is formed due to a water distribution pipe or unevenness on the inner surface of the pipeline, and unpainted parts are left behind, the other cylindrical rotor, which rotates in the opposite direction, will not be able to paint in the opposite direction. The paint is sprayed from the paint to paint the unpainted areas.

〔Example〕

Next, how the method for lining the inner surface of a pipeline according to the present invention is actually implemented will be explained using examples. FIG. 1 shows a lining device for carrying out the method for lining the inner surface of a pipeline according to the present invention, in which A is a side view and B is a rear view. In this device as well, the lining device travels inside the pipeline 1 by sliding the plurality of guide legs 11 on the inner surface of the pipeline 1. The lining device may be pulled by a wire as shown in FIG. 6, but it can also be pulled by a main agent supply pipe 6 and a curing agent supply pipe 7. The motors driven by this device are 2
The mixer 12 is of a static type in which the resins supplied from the two supply pipes 6 and 7 are mixed by simply passing through the mixer 12. The two cylindrical rotors 31 and 32 are rotated in reverse by a reversing mechanism 13, as explained in FIGS. 3 and 4. That is, the rotating shafts of the cylindrical rotors 31 and 32 are coaxial, and each rotating shaft is driven in reverse by the reversing mechanism 13.

The two types of resins supplied from the two supply pipes 6 and 7 are mixed by passing through the static mixer 12, and then transferred to the cylinder near the motor M through the two conduit pipes 15 and 16 attached to the joint 14. It is guided to the shaped rotor 31. In the illustrated example, the paint supplied to the first cylindrical rotor 31 is
A part of the paint passes through the first cylindrical rotor 31 and is supplied to the second cylindrical rotor 32, where it is painted. At this time, the two cylindrical rotors 31 and 32 rotate in opposite directions, and if the first cylindrical rotor 31 rotates clockwise as shown by arrow _a2 as shown in FIG. As shown in (b), the second cylindrical rotor 32 rotates counterclockwise as indicated by arrow _a3 . Therefore, even if a portion 10 is shaded by the water distribution pipe 9 when painting using the first cylindrical rotor 31,
In the second cylindrical rotor 32, the paint is injected toward this shaded part 10, so the second cylindrical rotor 3
When painting according to No. 2, the part 10 is reliably painted without being shaded.

As a specific structure for reversing the two cylindrical rotors 31 and 32, the structures shown in FIGS. 3 and 4 are effective. FIG. 3 is a vertical sectional view of the reversing mechanism 13 and the cylindrical rotors 31, 32, and FIG. 4 is a front view of the reversing mechanism 13. A first cylindrical rotor 31 closer to the motor M is fixed to the tip of a cylindrical rotating shaft 18 supported by a bearing B ₁ in the casing 17 of the reversing mechanism 13 . A rotating shaft 19 is inserted into this cylindrical rotating shaft 18, and the cylindrical rotating shaft 18
A second cylindrical rotor 32 is fixed to the tip protruding from the rotor. The inner rotating shaft 19 is directly fixed to the output shaft 20 of the motor M. In order to reverse the outer cylindrical rotation shaft 18 to which the first cylindrical rotor 31 is attached with respect to the inner rotation shaft 19 to which the second cylindrical rotor 32 is attached, the reversing mechanism 13 performs the following steps. It is structured like this.

That is, a gear G ₁ fixed to the base end of a rotating shaft 19 directly connected to the motor M meshes with a gear G ₂ fixed to the shaft 21 . On the back of gear G ₂ ,
Two gears G ₃ and G ₄ are fixed to a common shaft 22. And the gear G ₂ is the gear G ₃ on the back.
A gear that meshes with and rotates integrally with the gear _G3 .
G ₄ is a gear fixed to the base end of the cylindrical rotating shaft 18
It meshes with _G5 . As shown in Fig. 4, if the gear _G1 directly connected to the motor rotates in the counterclockwise direction indicated by the arrow _a3 , the gear _G2 meshing with the gear _G1 rotates clockwise, and the next gear _G3 and _G4
rotates counterclockwise. The last gear _G5 , which meshes with gear _G4 , rotates clockwise as indicated by arrow _a2 . After all, the gear G ₁ and the fixed rotating shaft 19
The second cylindrical rotor 32 rotates counterclockwise, whereas the last gear _G5 , the fixed cylindrical rotation shaft 18, and the first cylindrical rotor 31 rotate clockwise. , the two cylindrical rotors 31 and 32 are reversed. Note that B ₁ ……………B ₅ is a bearing.

The paint is supplied to the two cylindrical rotors 31 and 32 in the following manner. The first cylindrical rotor 31, which is closer to the motor M, has a large number of holes 8 for spraying paint in the peripheral wall of the portion closer to the motor M. A hole 22 for a paint guide is provided in the peripheral wall of the remaining portion on the tip side of the cylindrical rotor 31.
is opened. The tip of the paint conduit 16 opens at the position of the paint injection hole 8, and the tip of the other paint conduit 15 opens at the position of the paint guide hole 22. On the other hand, the peripheral wall of the second cylindrical rotor 32 is arranged in a double concentric manner on the outside of the paint guide hole 22 so as to surround the part of the paint guide hole 22 of the first cylindrical rotor 31 . Also in the peripheral wall of the second cylindrical rotor 32, there are paint injection holes 8...
is opened. Therefore, the cylindrical rotor 31,
32 are respectively reversed, the paint supplied through the paint conduit 16 is sprayed from the paint injection holes 8 of the first cylindrical rotor 31 in the direction shown in FIG. 2A.
Further, the paint supplied to the paint guide hole 22 side by the paint conduit 15 passes through the guide hole 22 due to the gravity and centrifugal force of the paint, and is supplied into the second cylindrical rotor 32, and the paint injection hole 8 ……………, it is injected in the direction shown in Figure 2 (b). It is also possible to use only one paint conduit and supply both the paint injection hole 8 and the paint guide hole 22 of the first cylindrical rotor 31 with one paint conduit.

In the cylindrical rotor 31 shown in FIG. 3, the diameter of the paint guide hole 22 for supplying paint to the second cylindrical rotor 32 is smaller than the diameter of the peripheral wall of the paint injection hole 8. , and the cylindrical rotors 31 and 32
The diameters of the paint injection holes 8 are made equal. On the other hand, as shown in FIG. 5, the first cylindrical rotor 31 has the same diameter at both the paint injection holes 8 and the paint guide holes 22, and the second cylindrical rotor 32 has the same diameter. The diameter can also be made larger than that of the first cylindrical rotor 31.

〔Effect of the invention〕

As described above, according to the present invention, one lining device is provided with two centrifugal coating means such as a cylindrical rotor, and each centrifugal coating means is rotated in opposite directions to coat the inner surface of the pipeline. A method is used to spray paint from different directions.
Therefore, by spraying the paint from two different directions using centrifugal force, it is possible to reliably line water pipes and uneven areas with paint without leaving any unpainted areas. Moreover, paint can be sprayed from both forward and reverse directions with one device.
The lining device only needs to pass through the pipeline once, and the lining work time is reduced from the conventional one.
It is the same as regular painting, and there is no need to extend the water cutoff time. The work process is the same as one-time painting, and costs are not high.

[Brief explanation of the drawing]

Fig. 1 is a side view and rear view of a lining device used in the method of lining the inner surface of a pipeline according to the present invention, Fig. 2 is a diagram showing a painting method according to the method of the present invention, and Fig. 3 is a diagram showing the lining device used in the method of lining the inner surface of a pipeline according to the present invention. A vertical cross-sectional view of the lining device used, FIG. 4 is a front view of the reversing mechanism in the same device, FIG. 5 is a vertical cross-sectional view showing another embodiment of the centrifugal coating means, and FIG. 6 is a conventional centrifugal lining method. FIG. In the figure, 1 is a pipeline, 8......
1 is a paint injection hole, 9 is a water pipe, 10 is a shaded part, 13 is a reversing mechanism, 18 is a cylindrical rotating shaft, 19 is a rotating shaft, 3
1 is a first cylindrical rotor, 32 is a second cylindrical rotor, and 22 is a paint guide hole.

Claims (1)

[Claims] 1 In a method in which a lining device is moved in a pipeline, paint is jetted out by centrifugal force by centrifugal coating means, and paint is applied to the inner surface of the pipeline by centrifugal force, two centrifugal coating means are provided, and each A method for lining the inner surface of a pipeline, characterized in that centrifugal coating means are rotated in opposite directions to inject paint onto the inner surface of the pipeline from different directions.