JP2006142219A - Method for partially applying thermoplastic powder paint to tapered pipe, and its device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for partially applying thermoplastic powder paint to tapered pipe which copes with the run-out of the tapered pipe when partially painting the tapered pipe, and can make a boundary between painted part and another part a clear straight line, and its device. <P>SOLUTION: While a heating device 2 moved to a painting boundary is moving to the bottom end of the tapered pipe 1 together with a painting device 3, the heating device 2 heats the tapered pipe. When the painting device reaches the painting boundary of the tapered pipe, the painting device is stopped while continuing the movement of the heating device, and the thermoplastic powder paint is sprayed from the painting device to the tapered pipe, and at the same time air is uniformly sprayed to the outer periphery of the tapered pipe at the heated painting boundary of the tapered pipe, which prevents the thermoplastic powder paint from the painting device from flowing outside of a boundary line to establish a painting boundary line. Subsequently, while the painting device is moved to the bottom end of the tapered pipe, the painting device completes the partial painting of the tapered pipe. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method and apparatus for partially coating a taper tube with a thermoplastic powder coating.

  Conventionally, a taper tube is rotated on a conveyor, and the heating device is moved while the taper tube is heated in a narrow range while moving the original mouth side of the taper tube, and the heated portion is applied to the coating device. Is moved so as to follow and partial painting is performed (for example, see Patent Document 1).

Japanese Patent No. 2805292

  By the way, in the above prior art, when the thermoplastic powder coating is baked on the taper tube in order to partially coat one end side of the taper tube, the taper tube is partially curved. If there is a part, the taper tube shakes when the taper tube rotates on the conveyor, and the thermoplastic powder coating does not adhere uniformly to the taper tube. If the thermoplastic powder paint is baked out along the line, it may adhere even to the part where the paint does not need to be painted, and the boundary line between the paint parts may not be aligned, so that a complete partial paint may not be achieved.

  Therefore, it may be possible to mechanically mask the parts that do not require painting, but in this case as well, the mask is fixed separately from the rotating taper pipe, so The gap between the outer surface of the taper tube and the inner surface of the mask does not become uniform in the direction of the inner periphery of the taper tube due to run-out, and the amount of baking of the powder paint becomes non-uniform, so that the vicinity of the boundary of the coating location There is a possibility that the boundary line is uneven on the pipe peripheral surface and the boundary line is not balanced.

  The present invention has been made in view of such problems of the prior art, and the object of the present invention is to cope with the vibration of the taper pipe when partially painting the taper pipe. Thus, an object of the present invention is to provide a method and an apparatus for partially coating a thermoplastic powder coating on a taper tube so that the boundary between the painted portion and the other portion can be clearly straightened. To do.

In order to achieve the above object, a method of partially applying the thermoplastic powder coating to the taper pipe of the present invention is as follows:
The taper tube is rotated on the conveyor, and the heating device is moved to the part to be painted while heating the original port side of the taper tube in a narrow range, and the coating device follows the heated part. In the process where partial painting is performed by moving
The heating device moved to the paint boundary is heated to the taper tube's main mouth side while following the coating device.
When the coating device reaches the coating boundary of the taper tube, the coating device is stopped while the movement of the heating device continues, and the thermoplastic powder paint is sprayed from the coating device onto the taper tube. The air is uniformly blown to the outer periphery of the taper tube at the heated coating boundary of the taper tube to prevent the thermoplastic powder paint from the coating apparatus from flowing out of the boundary line. To establish a paint boundary,
Next, the painting apparatus is also characterized in that the partial painting of the taper pipe is completed by the painting apparatus while being moved to the original mouth side of the taper pipe.

In addition, a coating apparatus for partially coating a thermoplastic powder paint on the taper pipe of the present invention is as follows.
The taper tube is rotated on the conveyor, and has a heating device that heats the original port side of the taper tube in a narrow range and a coating device that paints the heated part.
A boundary setting board is detachably attached to the coating apparatus, a taper copying board is attached to the boundary setting board so as to be movable up and down, and left and right. The two divided bodies are connected by a connecting member that can maintain a closed state surrounding the taper pipe and an open state released from the taper pipe, and one of the two divided bodies is connected to the taper pipe. A copying roller that is brought into contact with the outer periphery is attached.

  In the method and apparatus for partially coating a thermoplastic powder paint on a taper pipe according to the present invention, when the partial coating of the taper pipe is performed, the thermoplastic powder paint is removed from the coating apparatus. At the same time, the air is sprayed uniformly on the outer periphery of the taper tube at the heated coating boundary of the taper tube, and the thermoplastic powder paint from the coating device flows out of the boundary line. Since the paint boundary line is established by preventing this, it is possible to achieve complete wall painting that can clearly make the boundary between the paint part and other parts straight.

  In addition, a boundary setting substrate is attached to the coating apparatus in a detachable manner, a taper copying board is attached to the boundary setting board so as to be movable up and down, and left and right. A jacket is attached, and the two divided bodies are connected by a connecting member capable of maintaining a closed state surrounding the taper tube and an opened state released from the taper tube, and one of the divided members is connected to the taper. Since the copying roller that comes into contact with the outer periphery of the tube is attached, even if the taper tube shakes, a uniform air curtain can be implemented on the outer periphery of the taper tube at the boundary. A method and an apparatus for partially coating a thermoplastic powder coating that can limit the outflow of the thermoplastic powder coating at the boundary and make the boundary between the coated portion and the other portion more straight.

  FIG. 1 to FIG. 4 show a schematic view of a painting operation in the case of carrying out a method and apparatus for partially coating a thermoplastic powder coating on a taper pipe according to the present invention. Fig. 2 (a) is a side view, (b) is a schematic view of the front, and Fig. 2 is a boundary setting substrate, in which the thermoplastic powder coating is partially applied to the taper pipe according to the invention. (A) in the state of moving to the boundary part, (b) is a schematic view of the front, FIG. 3 is a state in the middle of the painting operation, (a) is a side, (b) is a schematic view of the front, and FIG. (A) of the state at the time of completion | finish of a painting operation | work is a schematic of a side, (b) is a front view.

  The taper tube 1, which is galvanized as a whole, is first transported onto a conveyor to be partially painted with the part to be partially coated polished first and the bare metal exposed. The heating device 2 and the coating device 3 are placed outside the conveyor on one end side (the original opening side of the tapered tube) of the conveyor. When the taper tube 1 is positioned on the conveyor, the coating device 3 and the heating device 2 are sequentially attached from the original port side of the taper tube 1.

  Next, the painting operation is started, and this is performed according to a schedule as shown in steps 1 to 4 of FIG.

  First, the taper tube 1 is in a rotating state on a conveyor (not shown), and the heating device 2 for heating in a narrow range of the taper tube 1 follows the coating device 3 on the end side (small diameter side). However, it is moved to the coating boundary part 4 from the original mouth side. The heating device 2 uses, for example, a movable high-frequency heating coil, and the high-frequency heating coil heats the taper tube 1 to about 300 ° C. at a frequency of 100 to 200 Hz in a narrow region. It is what has. At this time, an air blow jacket 7 described later is in an open state. (See Figure 1)

Next, the heating device 2 moved to the coating boundary 4 performs heating of the taper tube 1 while moving the taper tube 1 to the original opening side while following the coating device 3. When the coating apparatus 3 reaches the coating boundary portion 4, the coating apparatus 3 is temporarily stopped while the movement of the heating apparatus 2 is continued.
Then, for example, spraying the taper tube 1 with the thermoplastic powder coating 6 from a plurality of coating guns 5 and 5 provided on the upper part of the stopped coating apparatus 3 is started. For example, a two-part air blow jacket 7 provided on the side of the coating apparatus 3 is made uniform at the outer periphery of the taper tube 1 at the heated coating boundary 4 from the open state to the closed state. By spraying air from the inside of the air blow jacket 7, the thermoplastic powder paint 6 from the paint guns 5, 5 of the coating device 3 is prevented from flowing out of the line of the boundary 4. A boundary line can be established. If the gap between the outer periphery of the taper tube 1 and the inner periphery of the air blow jacket 7 is likely to be uneven due to the vibration of the taper tube 1, the air blow jacket 7 is removed. The close distance of the gap between the outer periphery of the taper tube 1 and the inner periphery of the air blow jacket 7 is maintained by a scanning operation that is finely adjusted in the vertical and horizontal directions. (See Figure 2)

  Then, once the coating apparatus 3 has stopped, the coating apparatus 3 is again applied when the coating in the vicinity of the coating boundary 4 of the taper pipe 1 is performed while the air blow jacket 7 remains in the coating boundary 4. The spraying of the thermoplastic powder coating material 6 with the coating guns 5 and 5 is continued while moving so as to follow the heating device 2. (See Figure 3)

  When the coating apparatus 3 moves to a distance where the spraying of the thermoplastic powder coating 6 by the coating guns 5 and 5 eliminates the influence of the excess powder at the coating boundary 4, the air blow jacket 7 comprising the divided body is The air blow jacket 7 is drawn to the coating device 3 while being returned to the open state. Then, while continuously moving the heating device 2 and the coating device 3, the thermoplastic powder paint 6 is continuously sprayed onto the taper tube 1 from the plurality of coating guns 5 and 5, and the taper tube 1 side of the taper tube 1 is opened. To complete the partial painting of the taper tube 1. (See Figure 4)

  In the method in which the thermoplastic powder coating is partially applied to the taper pipe having the above-described configuration, the outer periphery of the taper pipe 1 is uniformly applied at the coating boundary 4 of the taper pipe 1 in the initial stage of coating. By blowing air, the thermoplastic powder coating 6 from the coating guns 5 and 5 of the coating apparatus 3 is prevented from flowing out of the coating boundary 4 and the boundary between the coating portion and other portions. It is possible to achieve a complete partial coating that can clearly make a straight line.

  As an apparatus for carrying out such a coating method, a boundary setting substrate 8 can be separated from and attached to one side of the coating apparatus 3 by a separation moving cylinder 9 provided on the outer surface of the coating apparatus 3. It is attached. Therefore, the boundary setting substrate 8 can be kept in a stopped state independently by the control of the separating / moving cylinder 9 while the coating apparatus 3 is moving, and can also be connected to the coating apparatus 3 to follow.

  A taper copying board 10 is arranged on the boundary setting board 8, and the taper copying board 10 is used for setting the boundary via guide rollers 11, 11,. It can move on the surface of the substrate 8.

  Reference numerals 7 and 7 'denote air blow jackets formed of divided bodies, and the air is blown out substantially uniformly from the inner circumferences of the air blow jackets 7 and 7'. One air blow jacket 7 'is provided with cylinders 12 and 12, and rods 13 and 13 extending from the cylinders 12 and 12 are connected to the other air blow jacket 7. The connecting member of the air blow jackets 7 and 7 'divided by the rod 13 is constituted. The cylinders 12 and 12 are controlled so that the air blow jackets 7 and 7 'can be maintained in the closed state surrounding the taper pipe 1 as shown in FIG. 2 and the open state shown in FIG. Thus, air blow jackets 7 and 7 'are attached to the taper tube copying substrate 10.

  The other air blow jacket 7 is provided with copying rollers 14 and 14, and both the air blow jackets 7 and 7 ′ are in a closed state. At this time, it comes into contact with the outer peripheral surface of the taper tube 1. Therefore, when the taper tube 1 is shaken when the taper tube 1 is rotated, the copying rollers 14 and 14 freely move up and down and right and left according to the shake. As a result, the gap between the outer periphery of the taper tube 1 and the inner periphery of the air blow jackets 7, 7 'is always maintained constant.

  Reference numeral 15 denotes an auxiliary air blow nozzle. The auxiliary air blow nozzle 15 is provided at the upper center of the other air blow jacket 7. As a result, the operation of changing the direction of the thermoplastic powder coating 6 about to flow out of the coating boundary 4 and returning it to the original part is performed, and the prevention of the outflow of the thermoplastic powder coating 6 from the coating boundary 4 is further reinforced. .

  The heating device 2 and the coating device 3 are linked by a commonly known control means so that both devices can follow or independently move and stop.

  In the apparatus for partially coating the thermoplastic powder coating on the taper pipe having the above-described configuration, both air blow jackets 7 and 7 'move following the coating apparatus 3 in an open state. At the coating boundary 4, both air blow jackets 7, 7 ′ are closed on the outer periphery of the taper tube 1 and stopped, and the taper 1 follows the vibration of the taper tube 1. Therefore, the gap between the taper tube 1 and the air blow jackets 7 and 7 'is always constant, and a uniform strength and amount of air from the air blow jackets 7 and 7' is supplied to the tape tube 1. It can be sprayed onto the outer surface, thereby preventing the thermoplastic powder coating 6 from flowing out from the coating boundary portion 4 and making the boundary between the coating portion and the other portion clearly straight.

FIG. 2A is a schematic side view and FIG. 2B is a front view of a start preparation state for partially coating a thermoplastic powder coating on a taper pipe according to the present invention. (A) of the state which moved the board | substrate for boundary setting to the coating boundary part is a side view, (b) is the schematic of a front. In the middle of the painting operation, (a) is a schematic side view and (b) is a front schematic view. (A) of the state at the time of completion | finish of a painting operation | work is a schematic of a side, (b) is a front view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Taper tube 2 Heating device 3 Coating device 4 Coating boundary part 6 Thermoplastic powder coating 7, 7 'Air blow jacket 8 Boundary setting substrate 10 Tape tube copying substrate 12, 13 Connecting member 14 Copying Roller

Claims (2)

This is a method of partially coating the taper tube with the thermoplastic powder paint on the feed conveyor. The taper tube is rotated on the conveyor, and the taper tube is closed in a narrow area. In the process in which the heating device is moved to the part to be coated while being heated in the process and the coating apparatus is moved to follow the heated part and the partial coating is performed.
The heating device moved to the coating boundary is heated to the original side of the taper tube while following the coating device.
When the coating device reaches the coating boundary of the taper tube, the coating device is stopped while the movement of the heating device continues, and the thermoplastic powder paint is sprayed from the coating device onto the taper tube. The air is uniformly blown to the outer periphery of the taper tube at the heated coating boundary of the taper tube to prevent the thermoplastic powder paint from the coating apparatus from flowing out of the boundary line. To establish a paint boundary,
Next, the partial painting of the taper tube is completed by the painting device while moving the painting device to the original mouth side of the taper tube.
A method of partially applying a thermoplastic powder coating to a taper tube characterized by the above. A device that partially coats the taper tube with the thermoplastic powder coating on the feed conveyor. The taper tube is rotated on the conveyor, and the taper tube's base end side is narrow. In the one equipped with a heating device that heats in and a coating device that paints the heated part,
A boundary setting board is detachably attached to the coating apparatus, a taper copying board is attached to the boundary setting board so as to be movable up and down, left and right, and an air blow jacket made of a two-part body is attached to the copying board. The two divided bodies are connected by a connecting member that can maintain a closed state surrounding the taper pipe and an open state released from the taper pipe, and one of the two divided bodies is connected to the taper pipe. An apparatus for partially applying a thermoplastic powder coating to a taper tube, wherein a copying roller that is in contact with the outer periphery is attached.

Images