JPH11333362A - Resin coater for pipe joint and resin coating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin coater not caring about the size of an object to be coated, having a simple structure and by which the object is coated in uniform thickness, and further the excess paint powder is recovered. SOLUTION: A vessel 30 storing a resin powder and to which a pipe joint as an object 90 to be coated is attached so that its specified region is coated with the resin and a rotating mechanism for rotating the vessel 30 and the object 90 with the plural independent shafts 10 and 20 as the center are provided to constitute the resin coater of the pipe joint.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin coating apparatus and a resin coating method for a pipe joint.

[0002]

2. Description of the Related Art As a method of resin coating an object to be coated,
A method using an electrostatic coating gun shown in FIG. 3, a method using suction flow immersion coating shown in FIG. 4, a method using injection molding, and the like are known.

In the electrostatic coating gun construction method, a fluidized paint in a container is ejected from a gun-shaped nozzle by air pressure to perform electrostatic coating. In the suction flow immersion coating method, a powder container, an object to be coated, and a suction machine are connected, and the powder is circulated for coating. In the injection molding method, a resin film is formed inside the object to be coated by injection molding.

[0004]

The above-mentioned electrostatic coating gun method is suitable for relatively thin coating and coating, but not for thick coating. Further, in the suction flow immersion coating method, it is difficult to coat the surface of the entrance and exit of the powder, and the equipment investment is large. Further, the injection molding method has drawbacks, such as extremely large capital investment.

Further, as disclosed in Japanese Patent Application Laid-Open No. 9-239754, there is a powder slush molding machine which rotates an object to be coated and coats the inside thereof. There is a problem that the resin coating is biased.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a simple structure, capable of coating with a uniform thickness, and a surplus resin. It is an object of the present invention to provide a resin coating apparatus and a resin coating method that can collect powder and can be applied to any size object.

[0007]

In order to solve the above-mentioned problems, according to the first aspect of the present invention, a pipe joint is mounted as an object to be coated so that a predetermined portion is covered with a resin while accommodating a resin powder. And a rotating mechanism for rotating the container and the object to be coated about a plurality of independent axes.

[0008] In the invention described in claim 2, the rotating mechanism is a pipe joint resin coating apparatus having two axes perpendicular to each other.

According to a third aspect of the present invention, the rotary mechanism is a resin coating device for a pipe joint provided with control means capable of controlling a rotation stop angle and a rotation speed for each shaft.

In a fourth aspect of the present invention, there is provided a resin coating device for a pipe joint that includes a collision mechanism that collides with the container and vibrates the container and the object to be coated.

According to a fifth aspect of the present invention, there is provided a pipe joint resin coating apparatus in which the container is provided with a control valve for controlling the flow of the resin powder to the object to be coated.

In the invention described in claim 6, the object to be coated is a pipe joint having a cylindrical shape and having flanges at both ends, and a flange portion of the pipe joint is attached to an opening portion of the container, thereby forming the pipe. A pipe joint resin coating device for coating the inner surface of the joint.

In the invention according to claim 7, the preheated pipe joint is attached to a container containing the resin powder and integrated, and then the pipe joint and the container are rotated by a plurality of independent shafts. While controlling the rotation stop angle and the rotation speed, the flow of the resin powder between the container and the inside of the pipe joint is controlled by a control valve, to adhere the resin powder to a predetermined portion of the pipe joint, and A method for coating a pipe joint with a resin by coating a predetermined portion of the pipe joint with a resin by vibrating the pipe joint through a container to remove excess powder.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view of the resin coating device, and FIG. 2 is a diagram illustrating the operation of the resin coating device.

As shown in FIG. 1, the resin coating apparatus 1 comprises a support 5, rotating shafts 10, 10 and rotating shafts 20, 20.
A resin powder storage tank 30, a first masking 50,
A second masking 60, a control valve 70 (see FIG. 2),
And a hammer 80. Then, the coating target 90 is attached. In this embodiment, the case where the coating target 90 is a pipe joint will be described.

The support 5 is formed in a rectangular cylindrical body that is open up and down, and is formed integrally with the rotating shafts 10 and 10. In addition, two holes 6 and 6 for rotatably supporting the rotating shafts 20 and 20 are provided. The resin powder storage tank 30 is housed inside the cylindrical body of the support 5.

The rotating shafts 10, 10 are supported by bearing bodies 11, 11 and are rotatable by driving means, and their rotation speed and rotation stop angle are controlled by control means. Then, the resin powder storage tank 30 is rotated by rotating the support 5.

The rotating shafts 20, 20 are loosely supported in the holes 6, 6 of the support 5 as described above, and one end of the rotating shaft 20 is integrated with the side of the resin powder storage tank 30. Although not shown, a second drive means is attached to the other end, and the second drive means enables rotation. Then, the rotation speed and the rotation stop angle are controlled by the control means.

The rotation shaft 10 and the rotation shaft 20 rotate independently of each other, and the rotation speed and the rotation stop angle can be individually set.

The resin powder storage tank 30 is a container having a rectangular parallelepiped outer shape, in which a resin powder 35 is stored. The resin powder 35 is a powder of a thermoplastic molding resin or the like. The resin powder storage tank 30 is supported by being formed integrally with the rotary shaft 20 as described above, and is disposed in the cylindrical support 5. An opening 40 is formed on one surface (the upper surface in FIG. 1) of the resin powder storage tank 30, and a control valve 70 is provided at the position of the opening 40. Then, one end side of the object 90 to be coated is set at this position, and the first masking 50 is provided.

The control valve 70 opens or closes an entrance (opening 40) for charging and collecting the resin powder 35 from the resin powder storage tank 30 to the object 90 to be coated, depending on circumstances. By appropriately opening and closing the control valve 70 and appropriately controlling the rotating shafts 10 and 20, a hammering effect is exerted on the coating surface of the coating target 90, and the time for powder adhesion and powder breakage is controlled. I do. The resin powder 35 is melted by the heat of the object 90 to be coated and adheres to the object 90 to form a coating tank. The control valve 7
0 is such that the opening and closing of the valve body 71 and the valve body 72 can be controlled individually.

The hammer 80 is formed so as to protrude from the inner wall 5a of the support 5, and is driven by pneumatic driving or the like to
The resin powder storage tank 30 is hit. By hitting the resin powder storage tank 30, the vibration is also propagated to the set object 90 to be coated, and the excess resin powder 3 during coating is applied.
5 is removed from the coating target 90, and the resin powder storage tank 3 is removed.
Collect to 0.

The masks 50 and 60 are used to mask the resin powder 35 so that the resin powder 35 does not adhere to portions to be coated on the object 90 to be coated. As shown in FIG. It is formed in a disk shape and is disposed so as to cover the outer edge of the flange 91 at the end of the pipe joint to be covered. On the other hand, the second masking 60
It is formed in a bottomed cylinder, covers the outer edge of the flange 92 at the other end of the pipe joint, and closes the opening of the pipe joint to prevent the resin powder 35 from spilling out.

The object 90 to be coated is heated before setting, and is set at the position of the first masking 50 in the opening 40 of the resin powder storage tank 30.

(Operation) The procedure and operation of resin coating by the resin coating apparatus 1 will be described. First, the resin powder 35 is stored in the resin powder storage tank 30. The first masking 50 is attached to the resin powder storage tank 30. Next, a pre-heated pipe joint as the coating target 90 is set at the position of the opening 40 of the resin powder storage tank 30. Then, the second masking 60 is attached to the other end of the pipe joint.

Here, as shown in FIG. 2, the resin powder storage tank 30 and the pipe joint are rotated independently of the rotating shafts 10 and 20, respectively. Control the rotation speed. At the same time, the opening and closing of the control valve 70 are controlled so that the resin powder 35 can be charged and collected efficiently. In addition, a hammering effect is provided on the coated surface, and the time of powder adhesion to the coated object 90 and the time of powder breakage are controlled. By the above control, the resin powder 35 is melted and adhered by the heat of the pipe joint to form a coating layer having an appropriate thickness.

The surplus resin powder 3 during coating is
5 can be removed from the pipe joint by hitting with a hammer 80 and collected in the resin powder storage tank 30.

Hereinafter, each of the states (A) to (H) in FIG. 2 will be described in detail. In the state (A), the storage tank 30
Is located below the pipe joint, and the resin powder 35 is stored in the storage tank 3.
It accumulates at the bottom inside 0. And the valve bodies 71 and 72 are in an open state. Then, the storage tank 30 and the pipe joint are rotated, and in the state (B), the resin powder 35 spreads over the entire inside of the pipe joint. In this state, the outer curved portion 93 of the pipe joint is located on the lower side. Next, state (C)
, So that the inner curved portion of the pipe joint 94 is located on the lower side. The above state (B) and state (C) are repeated to form state (D) and state (E), and when the formation of the coating layer 36 by heat is advanced, the position is controlled to the state (F) and the hammer is controlled. Vibration is applied to the storage tank 30 and the pipe joint at 80 to collect the resin powder 35 to the storage tank 30 side, close the control valve 71 side, and dam the resin powder 35 so as not to return to the pipe joint side. However, in this state, the resin powder 35 remains at the tip of the pipe joint. Therefore, while the hammer 80 is being driven, the position of the state (G) is controlled to collect the remaining resin powder 35. At this time, the valve body 71 is opened at the same time, the valve body 72 is closed, and the resin powder 35 is efficiently collected. Finally, the position is returned to the state (H). Through the above process, a coating layer having an appropriate thickness is formed on the pipe joint. Finally, the pipe joint is removed from the storage tank 30.

[0029]

According to the first aspect of the present invention, since the container and the object to be coated can be rotated about a plurality of independent axes, the angle and the rotation speed of the container and the object to be coated can be increased. The effect is that the resin coating can be freely controlled and a resin coating having a uniform film thickness can be formed.

According to the second aspect of the invention, in addition to the effect of the first aspect, the rotary mechanism is formed by two axes perpendicular to each other, so that the present resin coating apparatus can be easily manufactured. It has the effect of being able to do so.

According to the third aspect of the present invention, in addition to the effects of the first or second aspect, the two axes as the rotation mechanism can be stopped at arbitrary angles, and the rotation speeds can be individually set. Since control can be performed, there is an effect that the angle and rotation of the container and the object to be coated can be more freely controlled.

According to the fourth aspect of the present invention, in addition to the effects of the first to third aspects, since there is provided a vibration mechanism for vibrating the container and the object to be coated, excess resin during coating is provided. This has the effect of removing and collecting the powder.

According to the fifth aspect of the present invention, in addition to the effects of the first to fourth aspects, a control valve for controlling the flow of the resin powder is provided. There is an effect that it can be performed efficiently.

According to the sixth aspect of the invention, in addition to the effects of the first to fifth aspects of the invention, there is an effect that a tubular body such as a pipe joint can be used as the object to be coated.

According to the method of the present invention, it is possible to form a resin coating having a uniform thickness.

[Brief description of the drawings]

FIG. 1 is a perspective view of a resin coating device according to an embodiment of the present invention.

FIG. 2 is a view showing the operation of the resin coating apparatus of the above.

FIG. 3 is a diagram showing a conventional method using electrostatic coating.

FIG. 4 is a diagram showing a conventional method using suction flow immersion coating.

FIG. 5 is a view showing a conventional injection molding method.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 resin coating device 5 support 10 rotating shaft 20 rotating shaft 30 container (resin powder storage tank) 35 resin powder 36 coating layer 40 opening 50 first masking 60 second masking 70 control valve 71 valve body 72 valve Body 80 Hammer 90 Object to be coated (Piping)

Claims (7)

[Claims] 1. A container accommodating a resin powder and having a pipe joint attached as an object to be coated so that a predetermined portion is coated with a resin, and rotating the container and the object to be coated around a plurality of independent axes. A resin coating device for a pipe joint, comprising: a rotating mechanism for rotating the resin. 2. The method according to claim 1, wherein the rotating mechanism includes two rotating mechanisms that are perpendicular to each other.
The resin coating device for a pipe joint according to claim 1, wherein the resin coating device has a shaft. 3. The rotation mechanism further comprises control means capable of controlling a rotation stop angle and a rotation speed for each axis.
Or the resin coating device of the pipe joint according to 2. 4. A collision mechanism for colliding with the container is provided,
The resin coating apparatus for a pipe joint according to any one of claims 1 to 3, wherein the container and the object to be coated are vibrated. 5. The resin coating apparatus for a pipe joint according to claim 1, wherein the container is provided with a control valve for controlling the flow of the resin powder to the object to be coated. 6. The coating object is a pipe joint having a cylindrical shape and having flanges at both ends, and a flange portion of the pipe joint is attached to an opening of the container to coat an inner surface of the pipe joint. The resin coating device for a pipe joint according to any one of claims 1 to 5, wherein 7. A preheated pipe joint is attached to a container containing resin powder and integrated therewith, and then the pipe joint and the container are rotated by a plurality of independent shafts, and the rotation stop angle and the rotation speed thereof are set. And controlling the flow of resin powder between the container and the inside of the pipe joint by a control valve to cause the resin powder to adhere to a predetermined portion of the pipe joint, and to connect the pipe joint via the container. By vibrating to remove excess powder,
A resin coating method for a pipe joint, which comprises coating a predetermined portion of the pipe joint with a resin.