JPH11253857A - Coating device for pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out excellent coating dealing with the ruggedness on the inner surface of socket by providing a brush for coating a pipe and forming the brush into a rotary type structure having spirally arrayed bristles. SOLUTION: The brush 11 has a center shaft 12 and is formed so that the bristles 13 are spirally planted around the tip part of the center shaft 12. And a coating material is stuck to the brush and the sticking quantity of the coating material is adequately controlled by pressing the brush 11 to a squeezing plate while rotating. After that, the brush 11 is moved by a robot 15 and the rotating brush 11 is pressed on end surface of the socket 2 to carry out the coating while rotating a cast iron pipe 1 supported in the horizontal direction around the axial center. Further, the direction of the brush 11 is changed by the robot 15 and the brush 11 is inserted into inside part of the socket 2 to coat the inner peripheral surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pipe coating apparatus.

[0002]

2. Description of the Related Art In general, zinc-rich paint is generally applied as a primary paint to the inner periphery of a receiving port at one end and an insertion port at the other end of a cast iron pipe. For example, in FIG.
Is a cast iron pipe, and a receiving port 2 is formed at one end thereof. Reference numeral 3 denotes a spray gun, which is disposed outside the tube 1 and can spray a zinc rich paint 4. In such a configuration, when the inner peripheral surface of the receiving port 2 is to be coated, the pipe 1 is rotated around the axis as shown in FIG. The zinc rich paint 4 is sprayed. The zinc rich paint 4 is supplied to the spray gun 3 by a pump (not shown).

[0003]

The zinc-rich paint 4, which is obtained by mixing zinc powder with a spreading agent, has a high abrasiveness and a rapid sedimentation. Therefore, when spraying is performed by the spray gun 3, clogging is likely to occur in the paint path of the pump, hose, the illustrated spray gun 3, and the like, and the pump is likely to be damaged due to internal abrasion. There is a problem. In addition, the inner surface of the receiving port 2 usually has a complicated shape having irregularities. When spraying from an oblique direction by the spray gun 3 as described above, a blind spot occurs and the unpainted portion 5 is formed. There is also a problem that the problem easily occurs. Further, there is even a problem that the yield of paint is poor by spraying.

Therefore, the present invention solves such a problem, that is, it does not have a paint supply path that is apt to generate, that is, a good paint is applied in response to the unevenness of the inner surface of the receiving port. The purpose is to be able to.

[0005]

In order to achieve this object, the present invention comprises a brush for painting a tube, the brush having a rotary structure in which the hairs are arranged in a spiral. It was made.

[0006] Such a configuration has the advantage that the brush is applied, that is, there is no advantage in that there is no feed path for the paint, which is likely to cause clogging, and the brush is a rotary type. Since the hairs are arranged in a spiral shape, there is an advantage that coating can be performed without producing blind spots, corresponding to the unevenness of the inner surface of the receiving port of the tube.

[0007]

FIG. 1 shows a brush in a coating apparatus according to the present invention. The brush 11 has a center axis 12 and the bristles 1 around the tip of the center axis 12.
3 has a configuration in which the hairs are spirally implanted. The dimensions of the helix and the like can be appropriately determined according to the dimensions and shape of the socket of the cast iron pipe to be coated. In particular, it is appropriate that the number of spiral peaks is several to several tens. As the material of the bristles 13, polyethylene is optimal from the viewpoint of the stiffness. In addition, nylon and goat wool can be used. Base end 1 of central shaft 12
Numeral 4 is configured as a simple shaft portion on which no flocking is performed.

As shown in FIGS. 2 to 4, the brush 11 is attached to the tip of an arm of a robot 15, and can be turned in any direction by the operation of the robot 15. In addition, the brush 11 has a base end 14 whose bearing 1
The robot 15 is rotatably supported by the robot 15 and is configured to be rotated at a rotational speed of about several tens of rpm by a motor 17 provided on the robot 15.

Next, with reference to FIGS. 2 to 4, a method of coating the inner peripheral surface of the receiving port 2 of the cast iron pipe 1 with the brush 11 will be described. First, as shown in FIG. 2, the zinc rich paint 4 is stored in a paint can 18, and the brush 11 is inserted into the opening 19 of the paint can 18 by a robot 15 and immersed in the paint. Then, paint is applied to the brush 11. At this time, the spiral brush 1 is
By rotating 1, the paint in the paint can 18 can be agitated to prevent sedimentation of the components.

Next, the brush 11 to which the paint is applied is taken out of the paint can 18 as shown in the figure, and the brush 11 is pressed against an ironing plate 20 fixedly provided above the paint can 18 while rotating the brush 11. By applying the paint, the paint adhesion amount is appropriately controlled. Thereby, the coating amount can be controlled to be constant.

Thereafter, the brush 11 is moved by the robot 15 as shown in FIG.
First, the rotating brush 11 is pressed against the end face 6 of the receiving port 2 while applying the rotation about the axis, thereby performing painting.

Next, as shown in FIG. 4, the direction of the brush 11 is changed by the robot 15, the brush 11 is inserted into the receiving port 2, and the inner peripheral surface is painted. Then, the painting is performed while the spiral brush 11 rotates,
Corresponding to the unevenness of the inner surface of the receiving port 2, it is possible to perform the coating without producing a blind spot.

The direction of the brush 11 is, as shown in FIG. 4, in a direction parallel to the axis of the cast iron tube 1 and, for example, in a non-horizontal direction crossing a plane passing through the axis of the cast iron tube 1. In other words, if it is a non-horizontal diagonal direction that intersects the paper surface of FIG. 4, the occurrence of blind spots can be reliably prevented. In addition, by attaching the brush 11 to the tip of the arm of the robot 15 as described above, the brush 11 can be freely moved in any direction.

As described above, the complicated shape of the opening and the receiving port of the cast iron tube 1 can be reduced with less coating unevenness and stable quality.
Automatic painting can be done. Further, the frequency of maintenance of the apparatus for maintaining the coating quality and the frequency of replacement of the brush can be minimized, and the yield of the paint can be improved.

[0015]

As described above, according to the present invention, a brush for coating a tube is provided, and the brush has a rotary structure in which the hairs are spirally arranged. Has the advantage that it does not have a feeding path for paint that is likely to occur, that is, the brush is not only a rotary type but also has a spiral arrangement of hairs. There is an advantage that it is possible to perform coating without producing blind spots, corresponding to the unevenness of the inner surface of the receiving port.

[Brief description of the drawings]

FIG. 1 is a front view of a brush in a pipe coating apparatus according to an embodiment of the present invention.

FIG. 2 is a view for explaining a coating procedure by a coating apparatus using the brush of FIG. 1;

FIG. 3 is a view for explaining a painting procedure at a next stage of FIG. 2;

FIG. 4 is a view for explaining a painting procedure at a next stage of FIG. 3;

FIG. 5 is a view for explaining a coating method using a conventional coating apparatus.

[Explanation of symbols]

 11 Brush 13 Hair 15 Robot 17 Motor

Claims (1)

[Claims] 1. An apparatus for coating a pipe, comprising a brush for coating the pipe, the brush having a rotary structure in which the hairs are arranged in a spiral.