JPH091010A - Coating device for internal surface of pipe - Google Patents

Abstract

PURPOSE: To uniformly spray the internal surface of a pipe by equipping a rotation driving part for rotating a nozzle part at a high speed and the connection part of the nozzle part and a coating agent feeding part and providing an elastic body in the nozzle part by which the blowoff port of the nozzle part is covered and a spouting coating agent is softly stored. CONSTITUTION: Firstly, the tip part of a nozzle part 10, especially the part of an elastic body 11 by which the blow-off port of the nozzle part 1 is covered and a spouting coating agent is softly stored is arranged in the prescribed position of the internal surface of a pipe W. When a driving motor 21 is driven, the nozzle part 10 is rotated at a high speed. In a coating agent feeding part 30, a prescribed amount of the coating agent is supplied from a tank storing the coating agent to the nozzle part 10 through a pump 31. Since a connection part 32 is provided between the nozzle part 10 and a hose 33 of the coating agent feeding part 30, the hose is not rotated even if the nozzle part 10 is rotated. Spout from the blow-off port of the nozzle part 10 is promoted by centrifugal force generated in the nozzle part 10. The supplied coating agent becomes an atomization shape and the internal surface of the pipe W is uniformly coated with the coating agent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating device for an inner surface of a pipe for applying a low-viscosity coating agent to the inner surface of a pipe such as a steel pipe.

[0002]

2. Description of the Related Art Conventionally, as a coating device for the inner surface of a pipe, a brush-type coating method in which brush bristles impregnated with the coating agent are directly pressed against the inner surface of the pipe to apply, and the coating agent is sprayed from a nozzle having a plurality of ejection holes. There is a nozzle type coating method in which it is sprayed indirectly. As shown in FIG. 11, the brush type coating method includes a nozzle portion 101 having a supply hole for the coating agent inside and one or a plurality of outlets for ejecting the coating agent from the supply hole. A rotation drive unit 201 that rotates the nozzle unit 101 at a low speed, a coating agent supply unit 301 that feeds a predetermined amount of coating agent into the supply hole of the nozzle unit 101,
The nozzle portion 101 is composed of a connecting portion 321 that connects the coating material supply portion 301, and the nozzle portion 101 has a structure in which brush bristles 111 are laid so as to cover the outlet.

First, the drive motor 211 of the first rotation drive unit 201 is driven, and the gear 40 is driven by the drive force.
1 rotates. A gear 411 is arranged in mesh with the gear 401. The gear 411 is rotatably fixed to the nozzle portion 101. Therefore,
The rotational force of the gear 401 is transmitted to the gear 411, and the nozzle portion 101 rotates, whereby the brush bristles 111 located at the tip of the nozzle portion 101 rotate. On the other hand, the coating agent supply unit 301 is provided with a tank for storing the coating agent,
The pump 311 supplies a predetermined amount of the coating agent to the supply hole of the nozzle unit 101. At the time of this supply, the supply hole of the nozzle unit 101 and the coating agent supply unit 301 are connected, and the nozzle unit 1
It has a connecting portion 321 for preventing the rotation of 01 from being transmitted to the coating agent supply portion 301. Therefore, the nozzle unit 101
Even if is rotating, the coating agent can be supplied without rotating the coating agent supply unit 301. Then, the supply of the coating agent fills the supply holes of the nozzle portion 101 with the coating agent. Further, the brush bristles 111 are directly pressed against the inner surface of the tube while being filled with the coating agent until they penetrate into the bristles 111 from the outlet, whereby the inner surface of the tube is blocked by the bristles 111.
It is a method of painting only about the width of. Alternatively, the nozzle portion 101 may be fixed, and the tube itself may be rotated by the rotation driving device 201 to apply the coating agent on the inner surface of the tube.

On the other hand, the nozzle type coating method is, as shown in FIG. 12, a nozzle portion 102 in which a coating agent supply hole is provided inside and a plurality of air outlets 162 continuous from the supply hole are provided.
And a rotation drive unit 2 for rotating the nozzle unit 102 at high speed.
02, a coating agent supply section 302 for feeding a predetermined amount of coating agent into the supply hole of the nozzle section 102, and the nozzle section 102.
And the coating agent supply section 302 are coupled to each other, and a coupling section 322 for preventing the rotation of the nozzle section 102 from being transmitted to the coating agent supply section 302 is provided. Note that FIG. 14 shows a case where the rotational driving force of the rotational driving unit 202 is transmitted by the belt 402.

First, the coating agent supply section 302
A pump 312 supplies a predetermined amount of the coating agent to the supply hole of the nozzle unit 102 from a tank that stores the coating agent. At this time, the nozzle unit 102 is rotating at high speed by the drive motor 212 of the rotation drive unit 202. Therefore, the nozzle unit 1
The coating material in the supply hole 02 is sprayed from the outlet 162 in the form of a spray due to the centrifugal force generated by the high speed rotation,
This is a method of painting the inner peripheral surface of the pipe.

[0006]

However, the above-mentioned conventional brush type coating method and nozzle type coating method have the following problems. In the brush type coating method, even a low-viscosity oil or fat, for example, a coating agent such as grease or rust preventive oil can be coated by pressing it even on the inner surface of the pipe. However, unless the brush bristles directly contact the inner surface of the tube to maintain a constant pressing force, the thickness of the coating agent cannot be kept constant and high-speed coating is difficult.
Moreover, unless the supply pressure of the coating material from the coating material supply portion to the brush portion is constant and the structure is a high-level supply structure that is gradually performed, the thickness of the coating material to be coated becomes uneven. On the other hand, in the nozzle type coating method, if the liquid coating material has a high viscosity, by rotating the nozzle at a high speed, it is possible to perform extremely stable coating by spraying and spraying the coating material at a high speed. is there. However, with a low-viscosity coating agent such as grease or rust preventive oil, the coating agent cannot be sprayed even when it is rotated at a high speed and cannot be coated. The present invention has been made in view of the above problems, and provides a coating device for an inner surface of a pipe for coating a low-viscosity coating agent on the inner surface of a pipe such as a steel pipe.

[0007]

According to the present invention, there is provided a nozzle part having a supply hole for a coating agent therein and a plurality of outlets continuous from the supply hole, and a rotary drive part for rotating the nozzle part at a high speed. And a connecting portion that connects the nozzle portion and the coating material supply portion with each other, and the nozzle portion covers the blowout port and blows the coating material. A coating device for an inner surface of a pipe is characterized by having an elastic body that flexibly accumulates a coating agent ejected from an outlet.

What is most noticeable in the present invention is that the nozzle portion has an elastic body that covers the outside of the air outlet and flexibly accumulates the coating agent ejected from the air outlet. The elastic body is preferably a wire mesh body. By using this wire mesh body, the coating agent is finely and irregularly cut, and the flexibility of accumulating the coating agent is compatible. It is preferable to have a gap filled with the coating agent between the air outlet and the elastic body. This makes it easy to spread the coating agent over the entire elastic body. Further, it is preferable that the elastic body is provided in a shape in which the air outlet is spirally wound with a wire mesh body, or is provided in a bag shape that covers the tip of the nozzle portion including the air outlet. Further, as the wire mesh body, for example, an armored wire mesh, a woven wire mesh, a metal lath, a wire lath, an expanded metal, a welded wire mesh, or the like can be selected. These are mainly made of metal, but may be made of chemical resin such as plastic or chemical fiber. Then, as a method of fixing the elastic body, in addition to welding and adhesion, caulking and fitting, screws, clamps, pins and the like can be appropriately used.

Further, according to the present invention, a moving mechanism capable of adjusting the position of the tip of the nozzle portion up and down, left and right, or forward and backward is provided to perform optimal positioning in accordance with changes in the size of the pipe and the coating range. Is preferred.

[0010]

In the coating apparatus for the inner surface of the pipe according to the present invention, the nozzle has an elastic body covering the outlet of the nozzle to flexibly accumulate the coating agent ejected from the outlet. Therefore, the coating agent supplied from the coating agent supply unit is
Even if it is supplied non-uniformly, it is accumulated within the allowable expansion and contraction amount of the elastic body. Then, the centrifugal force generated in the nozzle portion that rotates at a high speed promotes the ejection of the coating agent from the outlet of the nozzle portion, so that the coating agent is atomized and can be uniformly sprayed.

The elastic body is a wire mesh body.
Therefore, the elastic body flexibly expands and contracts with respect to the coating agent ejected from the blowout port, and it is easy to accumulate the coating agent, and the wire mesh shape has a finer hole diameter than the blowout port. You can As a result, even a low-viscosity coating agent such as grease or rust preventive oil can be finely cut and ejected. Moreover, there is a gap between the air outlet and the elastic body that can be filled with the coating agent. Therefore, the coating agent ejected from the blow-out port hits the elastic body and easily fills not only a part of the elastic body near the blow-out port but also the entire elastic body, which is effective for uniform coating of the coating agent.

Further, the elastic body has a shape in which the air outlet is spirally wound with a wire mesh body, or a bag shape for covering the tip of the nozzle portion including the air outlet. In the case where the elastic body has a wire mesh body in a spiral shape, the hole diameter of the wire mesh body is likely to be fine, whereby the sprayed coating agent is likely to be finely cut into a spray form. Further, when the elastic body has a bag shape, it easily expands and contracts, so that it easily accumulates flexibly in the amount of the coating agent, and the allowable range for the pressure of the coating agent supplied from the coating agent supply section becomes wider. .

[0013]

First Embodiment A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows an overall configuration diagram of a coating apparatus according to an embodiment of the present invention. The coating apparatus 1 includes a nozzle unit 10 having a coating material supply hole inside and one or a plurality of continuous air outlets from the supply hole, and a rotation drive unit 20 capable of rotating the nozzle unit 10 at high speed. A coating agent supply unit 30 that feeds a predetermined amount of coating agent into the supply hole of the nozzle unit 10, and a connection unit 3 that connects the nozzle unit 10 and the coating agent supply unit 30.
2, the nozzle portion 10 covers its outlet,
Elastic body 11 for flexibly accumulating the coating agent ejected from the outlet
have.

The rotary drive unit 20 includes a drive motor (air motor type) 21, a shaft 22 for transmitting the drive force as a rotational force, a rotary body 40 fixed to the tip of the shaft 22, and a nozzle unit 10. Rotating body 41 fixed to
And a belt 42 for transmitting the rotational force between the rotating bodies 40 and 41. Also drive motor 2
1 may utilize an electric motor or a hydraulic motor. Furthermore, as a method of drive transmission, even if you use a chain or gear,
You may have the structure which can change a rotation ratio.

The coating agent supply device 30 has a pump 32 containing a tank for storing the coating agent and a hose 33 for supplying the coating agent in the tank. A mechanism such as a cylinder may be used as a mechanism for feeding this coating agent. The supply pressure of the coating agent may be made constant or variable depending on the capacity of the pump or the cylinder, but may be adjusted by providing a metering valve or the like on the supply side.

The coating material of the first embodiment is JIS standard K22.
A mineral oil-based rust preventive oil for screws, which is an oil and fat having a grease consistency of No. 1 of 20, was used. Further, the pipe W which is the material to be treated is
JIS G3452 carbon steel pipe for piping (commonly known as SP
G) Nominal diameter 15A (outer diameter 21.7mm × thickness 2.8m
m) was used.

FIG. 2 is an external view of the nozzle portion, and FIG. 3 is A of FIG.
A sectional view taken along the line A-A 'and FIG. 4 are partial front views of the nozzle cylinder of the nozzle portion. The nozzle unit 10
The nozzle cylinder 12 has a hollow rod shape having a coating material supply hole 15 inside, and an elastic body 11 arranged so as to surround a blowout port 16 provided near the tip of the nozzle cylinder 12. The supply hole 15 of the nozzle cylinder 12 is provided with a plurality of outlets 16 continuous from the supply hole 15. Further, a bolt portion 13 that is screwed into the nut 14 is provided at the tip thereof.

The nozzle cylinder 12 has a rod shape with an outer diameter of 13.8 mm and has twelve outlets 1 continuous from the supply hole 15.
6 (hole diameter 4 mm). These 12 outlets 16
Are arranged every three in the longitudinal direction of the nozzle cylinder 12 and in four directions. Further, the position of the air outlet 16 is determined by the nozzle cylinder 12
The positions may be symmetrical with respect to the outer peripheral diameter of, or may be irregular. Also, one or more, or the nozzle cylinder 1
It may be arranged in a stepped manner in the longitudinal direction of 2 or arranged in a long hole.

As the elastic body 11, a wire mesh body of expanded metal of JIS standard G3351 having a size of 60 × 100 mm is used. It is something that can be maintained. In addition, although the nominal diameter of 15 A was used in the first embodiment, it has been confirmed that a pipe having a nominal diameter of up to 100 A (outer diameter 114.3 mm × thickness 4.5 mm) can be applied. Further, the elastic body 11 that covers the outlet 16
Between the nozzle cylinder 12 and the nozzle cylinder 12, there is a gap 17 capable of accumulating the coating agent supplied from the supply hole 15.

When fixing the elastic body 11 to the nozzle cylinder 12, after inserting the cylindrical elastic body 11 into the nozzle cylinder 12, and then inserting the collar 18 for preventing the elastic body 11 from coming off. , The nut 14 and the nozzle cylinder 1
It is screwed and fixed to the bolt portion 13 at the tip of No. 2.

Therefore, the pipe W is made by the above coating apparatus 1.
In applying the coating to the inner surface of the tube, first, the tip portion of the nozzle portion 10, particularly the elastic body 11, is arranged at a predetermined inner surface position of the tube W. Then, in that state, the drive motor 21 is driven to rotationally drive the shaft 22. This shaft 22
The rotating body 40 is rotated by the rotational driving of the rotating body 40, and the belt 42 connected on the circumference of the rotating body 40 is also rotated. Also, like the rotating body 40, the rotating body 41 connected to the belt 42
Also the rotational force is applied. As a result, the nozzle portion 10 fixing the rotating body 41 rotates.

On the other hand, a pump 31 supplies a predetermined amount of the coating agent from the tank for storing the coating agent in the coating agent supply section 30 to the supply hole 15 of the nozzle section 10. At this time, the nozzle unit 10 is rotated by the drive motor 21 of the rotation drive unit 20. Therefore, the nozzle cylinder 1 of the nozzle unit 10 is simply used.
If the hose 33 of the coating agent supply unit 30 is simply connected to the wiring 2, problems such as twisting of the hose due to rotation will occur. Therefore, the connecting portion 33 is provided.

As shown in FIG. 10, in the connecting portion 32, the nozzle cylinder 12 and the hose 33 are fitted into their inner holes by the outer cylinder 34 and the side wall 35. Bearings 36 and 37 rotatably support the outer cylinder 34 in the gap between the outer cylinder 34 and the nozzle cylinder 12. The gap between the bearings 36 and 37 is kept constant by a collar 38. Then, the bearings 36 and 37 are restrained from lateral movement by a retaining ring 39. The outer cylinder 34 and the side wall 35 are fixed by welding, and the side wall 35 and the hose 33 are fixed by welding. Therefore, even when the nozzle cylinder 12 is rotating, the outer cylinder 34 is maintained without rotating because it is mediated by the bearings 36 and 37. Further, even if the coating agent is supplied from the hose 33 and flows through the connecting portion 32 to the supply hole 15 of the nozzle cylinder 12, the coating material is leaked from the connecting portion 32 because it is sealed by the rubber packing 50. There is no.
Therefore, the coating agent in the supply hole of the nozzle portion 10 is sprayed in the form of a spray from the outlet 16 by the centrifugal force generated by the rotation, and coats the inner peripheral surface of the pipe W.

In the coating apparatus 1 according to the first embodiment, the number of rotations of the nozzle portion is about 1000 rpm and the pump pressure is 4 to 5 kg.
As a result of coating at f / cm ^2, the coating agent having a thickness of 0.5 to 1.0 mm could be coated on the inner surface of the tube W. It was also found that the coating agent was less likely to be atomized by lowering the number of rotations of the nozzle portion, and conversely the coating agent was more likely to be atomized by increasing the number of rotations. Furthermore, by lowering the pump pressure, it is possible to reduce the amount of coating agent supplied to reduce the coating thickness, and, on the contrary, increase the pump pressure to increase the amount of coating agent supply and increase the coating thickness. It was recognized that it was possible.

By using the coating device having the elastic body as described above, the coating material supplied from the coating material supply section is once accumulated in the elastic body and the magnitude of the centrifugal force generated by the rotation of the nozzle section. Thereby, the coating agent is blown out from the inside of the elastic body. In other words, in the conventional nozzle type coating device,
The pressure of the coating agent supplied from the pump was released as it was, but once it was absorbed flexibly by the elastic body,
I had to keep applying a small constant pressure,
Even a pump that supplies at regular intervals can be used. Further, since the elastic material is once accumulated, it is possible to adjust the ejection amount of the coating agent depending on the number of rotations of the nozzle portion. Therefore, it becomes easy to adjust the coating with a constant thickness. In particular, by rotating the nozzle portion at a high speed, the spray of the coating agent can be promoted in the form of a spray, so that there is an effect that even low-viscosity grease or grease such as rust preventive oil can be applied.

Further, since the gap is provided between the air outlet and the elastic body, it is possible to promote the absorption of the coating agent in the entire elastic body. Moreover, since the elastic body itself has elasticity, it is possible to adjust the supply pressure by the pump and the number of rotations of the nozzle portion from two sides, and a wide range of coating control can be performed.

Next, a second embodiment will be described with reference to FIGS. 5 and 6. 5 is an enlarged external view of the tip portion of the nozzle portion, and FIG. 6 is a sectional view thereof. The nozzle portion 10a of the second embodiment has a cylindrical shape as in the first embodiment and has a supply hole 15a therein, and the outlet 1 is continuous with the supply hole 15a.
It is composed of a nozzle cylinder 12a having 6a, and an elastic body 11a that covers the air outlet 16a of the nozzle cylinder 12a in a bag shape. Further, a gap 17a in which the coating material can be accumulated is provided between the elastic body 11a and the outlet 16a. The other configurations of the coating agent supply unit, the rotation drive unit, and the like were the same as in Example 1. According to the second embodiment, it is possible to reduce the number of parts as compared with the first embodiment while maintaining the same effect as the first embodiment.

Next, a third embodiment will be described with reference to FIGS. 7 and 8. FIG. 7 is an enlarged external view of the tip portion of the nozzle portion, and FIG. 8 is a sectional view taken along the line BB ′. The nozzle portion 10b of the third embodiment has a structure in which the elastic body of the nozzle portion of the first embodiment is limited to the outer peripheral portion of the air outlet. That is,
As shown in FIG. 8, the elastic body 11b is fixed by a retainer 18b so as to cover the outer periphery of the outlet 16b, and the elastic body 11b and the retainer 18b may be welded together for the purpose of improving the strength. Accordingly, it is not necessary to cover the entire nozzle cylinder 12b with the elastic body 11b.

Alternatively, as shown in FIG. 9, if the nozzle cylinder 12c provided with the projection 191c and the presser tool 18c provided with the key groove 192c fitted to the projection 191c are provided, the elastic body 11
The problem that the position of c rotates and shifts from the outlet 16c does not occur. However, FIG. 9 shows the case where the nozzle portion has no gap.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a coating apparatus according to a first embodiment.

FIG. 2 is an enlarged external view of a nozzle portion according to the first embodiment.

FIG. 3 is a sectional view taken along the line A-A ′ according to the first embodiment.

FIG. 4 is a partial front view of the nozzle cylinder of the nozzle unit according to the first embodiment.

FIG. 5 is an enlarged external view of the tip portion of the nozzle portion according to the second embodiment.

FIG. 6 is a cross-sectional view of the tip portion of the nozzle portion according to the second embodiment.

FIG. 7 is an enlarged external view of a tip portion of a nozzle portion according to the third embodiment.

FIG. 8 is an explanatory view of a tip portion of a nozzle portion according to the fourth embodiment.

FIG. 9 is another example 1 of the cross-sectional view of the tip portion of the nozzle portion according to the fourth embodiment.

FIG. 10 is an explanatory diagram of a connecting portion according to the first to fourth embodiments.

FIG. 11 is an overall configuration diagram of a conventional coating device (brush type coating device).

FIG. 12: Overall configuration diagram of a conventional coating device (nozzle type coating device)

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coating device 10 Nozzle part 11 Elastic body 12 Nozzle cylinder 13 Bolt part 14 Nut 15 Supply hole 16 Air outlet 17 Gap 20 Rotation drive part 21 Drive motor 22 Shaft 30 Coating agent supply part 31 Pump 32 Connection part 33 Hose 34 Outer cylinder 35 Side wall 36, 37 Bearing 40, 41 Rotating body 42 Belt W tube

Claims (6)

[Claims] 1. A nozzle portion having a coating agent supply hole therein and a plurality of outlets continuous from the supply hole, a rotary drive section for rotating the nozzle section at a high speed, and a supply hole of the nozzle section. And a connecting portion that connects the nozzle portion and the coating agent supply portion, wherein the nozzle portion covers the blowout port and softens the coating agent ejected from the blowout port. A coating device for the inner surface of a pipe, which has an elastic body that accumulates in the interior of the pipe. 2. The coating device for an inner surface of a pipe according to claim 1, wherein the elastic body is a wire mesh body. 3. A coating apparatus for an inner surface of a pipe according to claim 1, wherein a gap filled with the coating agent is provided between the air outlet and the elastic body. 4. The coating device for an inner surface of a pipe according to claim 1, wherein the elastic body has a shape in which the air outlet is spirally wound with a wire mesh body. 5. The coating device for an inner surface of a pipe according to claim 1, wherein the elastic body has a bag shape that covers a tip end portion of a nozzle portion including a blowout port. 6. The wire mesh body according to any one of claims 2 to 5, wherein the wire net-like body is one or two kinds of an armored wire net, a woven wire net, a metal lath, a wire lath, an expanded metal, and a welded wire net. A coating device for the inner surface of the pipe.