JPH0741182B2 - External coating device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a pipe outer surface coating apparatus.

Conventional technology Conventionally, for painting the outer surface of a pipe, a box-shaped booth forms a painting chamber, the pipe to be coated is inserted into the painting chamber through the pipe insertion port formed in the booth, and the pipe to be coated is painted inside the painting chamber. Was jetted. Then, since there is a problem that paint that exists in a mist state without adhering to the pipe to be coated diffuses from the pipe insertion port to the outside of the coating chamber and harms the working environment, conventionally the air in the coating chamber is sucked in to collect dust. Was blown to.

However, according to the above-described conventional configuration, when the suction force is increased in order to prevent the paint from dissipating, the paint sprayed toward the coating target pipe is affected by the suction air flow, and the coating target is affected. There is a problem that the efficiency of the paint adhesion to the pipe is reduced.

The present invention solves the above problems, and an object of the present invention is to provide a pipe outer surface coating device capable of preventing the paint from being dissipated without reducing the efficiency of the paint to adhere to the pipe to be coated.

Means for Solving the Problems In order to solve the above problems, the present invention provides a coating chamber having a pipe insertion port for inserting a pipe to be coated and an intake port communicating with the outside, and a pipe insertion chamber in the coating chamber. A coating gun that opens toward the coating target pipe that is inserted through the mouth and that communicates with the coating gun through the pipe insertion port, and a pipe insertion chamber that covers the periphery of the coating target pipe A first air intake passage having one end communicating with the coating chamber and the other end communicating with the air intake device via the first air flow controller; and one end communicating with the pipe insertion chamber and the other end having the second air flow controller. The second intake passage communicates with the first intake passage via the first intake passage.

Further, a coating chamber having a pipe insertion port for inserting the coating target pipe and an intake port communicating with the outside, and an opening toward the coating target pipe inserted through the pipe insertion port in the coating chamber,
A painting gun for injecting paint, a pipe insertion chamber that communicates with the painting chamber through the pipe insertion port and covers the periphery of the pipe to be coated, and one end communicates with the painting chamber through the first throttle portion. And a second throttle portion having the other end communicating with the intake device, and one end communicating with the pipe insertion chamber and the other end communicating with the downstream side of the first throttle portion of the intake passage. And the size of the flow path of the second throttle portion is formed in a predetermined ratio.

Operation With the above-described configuration, the paint sprayed from the coating gun does not adhere to the coating target pipe and becomes a mist and floats in the air in the coating chamber, together with the outside air flowing into the coating chamber from the intake port. It is sucked by the suction device through the intake passage. Further, a part of the paint that is not sucked into the first intake passage and flows into the pipe insertion chamber from the pipe insertion opening is sucked into the first intake passage through the second intake passage and is sucked into the suction device together with other paint. .
Therefore, the dissipation of the paint to the outside can be prevented without increasing the suction force of the suction device more than necessary, that is, without increasing the paint to such an extent that the adhesion of the paint to the pipe to be coated is hindered. Moreover, by adjusting the openings of the first air volume controller and the second air volume controller, the suction force of the suction device appropriately acts on the coating chamber and the pipe insertion chamber, and the flow of the suction airflow in the coating chamber is adjusted to an arbitrary value. Controlled by the state.

Further, by setting the sizes of the flow passages of the first throttle portion and the second throttle portion to be a predetermined ratio, the suction force of one suction device appropriately acts separately in the coating chamber and the pipe insertion chamber, and The flow state of the suction air flow at is fixedly set to the optimum one.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, the coating chamber 1 is formed by a box-shaped booth 2. The booth 2 has a pair of first pipe insertion ports 4 for inserting the pipe 3 to be coated and an intake port 5 communicating with the outside. An intake filter 6 is formed on the intake port 5. Further, the booth 2 is provided with a pipe insertion chamber 7 which communicates with the coating chamber 1 through each first pipe insertion port 4, and the pipe insertion chamber 7 is formed with a second pipe insertion port 8. . The pipe 3 to be coated is arranged so as to pass through the coating chamber 1 through the first pipe insertion port 4 and the second pipe insertion port 8, and is opened toward the pipe 3 to be coated and to the paint feed pipe 9. A communicating coating gun 10 is provided inside the coating chamber 1. A first intake passage 11 communicating with the coating chamber 1 at one end is provided so as to communicate with the intake device 13 at the other end via the first air flow controller 12. In addition, the second intake passage communicating with the pipe insertion chamber 7 at one end
Reference numeral 14 is provided so as to communicate with the first intake passage 11 on the downstream side of the first air flow rate controller 12 via the second air flow rate controller 15.

The operation of the above configuration will be described below. The coating is performed by spraying the coating material 16 from the coating gun 10 while rotating the coating target tube 3 inserted in the booth 2 about the axis. At this time, the target pipe 3 to be coated with the paint 16 sprayed from the coating gun 10
The paint 16 that does not adhere to the surface and becomes a mist and floats in the air in the coating chamber 1 is sucked into the suction device 13 through the first intake passage 11 together with the outside air flowing into the coating chamber 1 from the intake port 5. To be done.
Further, a part of the paint 16 that is not sucked into the first intake passage 11 and flows into the pipe insertion chamber 7 from the first pipe insertion port 4 is sucked into the first intake passage 11 through the second intake passage 14, The paint 16 is sucked into the suction device 13. Therefore, the suction force of the suction device 13 is increased more than necessary, that is, the paint 16 for the coating target pipe 3
Dispersion of the paint 16 to the outside can be prevented without increasing it to the extent that it inhibits the adhesion of the paint. Moreover, by adjusting the openings of the first air volume controller 12 and the second air volume controller 15, the suction force of the suction device 13 appropriately acts on the coating chamber 1 and the pipe insertion chamber 7, and the coating chamber 1
The flow of the suction airflow inside is controlled to an arbitrary state.

FIG. 2 shows another embodiment of the present invention, which is a coating room.
A box-shaped booth 22 is formed, and the booth 22 is formed with a pair of first tube insertion ports 24 for inserting the coating target pipe 23 and an intake port 25 communicating with the outside. further,
The booth 22 is provided with a pipe insertion chamber 26 that communicates with the coating chamber 21 via each first pipe insertion port 24, and a second pipe insertion port 27 is formed in the pipe insertion chamber 26. And the pipe to be painted
23 is disposed so as to pass through the coating chamber 21 through the first pipe insertion port 24 and the second pipe insertion port 27, and the coating gun 29 is opened toward the coating target pipe 23 and communicates with the coating pressure feed pipe 28. Is inserted through the intake port 25. The first intake port 30 communicates with the bottom of the coating chamber 21 as an opening at one end serving as a first throttle portion 31, and the first intake passage 30 communicates with the intake device 32 at the other end. In addition, the second end of which one end communicates with the tube insertion chamber 26
An intake passage 33 is coaxially inserted inside the first intake passage 30, and the other end of the second intake passage 33 serves as a second throttle portion 34 downstream of the first throttle portion 31 of the first intake passage 30. It is located on the side and has an opening. In addition, the flow paths A and B of the first throttle portion 31 and the second throttle portion 34
Are formed to have a predetermined ratio.

In this configuration, the first intake passage 30 is not sucked and
Part of the paint 35 flowing from the pipe insertion port 24 into the pipe insertion chamber 26 is sucked into the first intake passage 33 through the second intake passage 33, and the other paint
It is sucked into the suction device 32 together with 35. At this time, the ratio of the suction force acting on the coating chamber 21 and the tube insertion chamber 26 is determined by the first throttle portion.
31 and the ratio of the flow paths A and B of the second throttle portion 34. As a result, the suction force of one suction device 32 acts appropriately on the coating chamber 21 and the pipe insertion chamber 26, and the flow state of the suction airflow in the coating chamber 21 is fixedly set to the optimum one. It

EFFECTS OF THE INVENTION As described above, according to the present invention, it is possible to prevent the coating material from being dissipated to the outside without increasing the suction force of the suction device to such an extent that the coating material adheres to the coating object pipe. Moreover, by adjusting the opening degree of the first air volume controller and the second air volume controller, the suction force of the suction device appropriately acts on the coating chamber and the tube insertion chamber, and the flow of the suction airflow in the coating chamber can be arbitrarily adjusted. Can be controlled.

Further, by setting the size of the flow passages of the first throttle portion and the second throttle portion to be a predetermined ratio, the suction force of one suction device can be appropriately applied to the coating chamber and the pipe insertion chamber to act on the coating chamber. It is possible to fixedly set the flow state of the suction air flow in the optimum state.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention, and FIG. 2 is an overall configuration diagram showing another embodiment of the present invention. 1,21 …… Coating room, 3,23 …… Coating pipe, 4,24 …… First pipe insertion port, 5,25 …… Intake port, 7,26 …… Pipe insertion chamber, 10,29…
… Painting gun, 11,30 …… First intake passage, 12 …… First air flow controller, 13,32 …… Suction device, 14,33 …… Second intake passage, 15…
… Second air flow controller, 31 …… First throttle, 34 …… Second throttle.

Claims (2)

[Claims] 1. A coating chamber having a pipe insertion port for inserting the pipe to be coated and an intake port communicating with the outside, and an opening toward the pipe to be coated inserted through the pipe insertion port in the coating chamber. The paint gun that sprays paint, the pipe insertion chamber that communicates with the coating chamber through the pipe insertion port and that covers the circumference of the pipe to be coated, and one end that communicates with the coating chamber and the other end A first intake port communicating with the intake device via the first air flow controller, one end communicating with the pipe insertion chamber, and the other end second.
A pipe outer surface coating apparatus, comprising: a second intake passage communicating with the first intake passage via an air flow controller. 2. A coating chamber having a pipe insertion port for inserting a pipe to be coated and an intake port communicating with the outside, and an opening toward a pipe to be coated inserted through the pipe insertion port in the coating chamber. Then, a coating gun for spraying paint, a pipe insertion chamber communicating with the coating chamber through the pipe insertion port and covering the periphery of the pipe to be coated, and one end of the pipe insertion chamber in the coating chamber through the first throttle portion. An intake passage communicating with the other end of the intake passage,
One end communicates with the pipe insertion chamber and the other end has the first intake passage.
A second throttle portion communicating downstream from the throttle portion;
A pipe outer surface coating device characterized in that the sizes of the flow paths of the throttle portion and the second throttle portion are formed in a predetermined ratio.