JPH086529Y2 - Flow coater line transfer device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an apparatus for conveying an object to be coated in a flow coater line.

[Prior Art] Conventionally, a flow coater has a front conveyor and a rear conveyor for transporting an object to be coated, which are spaced apart from each other before and after a coating point where a paint curtain hangs. In this flow coater, the object to be coated is passed at a constant speed by a front conveyor and a rear conveyor in a paint curtain that hangs at a constant static pressure to form a predetermined coating film on the upper surface of the object to be coated. It is a thing.

Therefore, in the flow coater, the film thickness of the paint applied to the object to be coated is the coating speed (= conveyor transfer speed),
It is determined by the film thickness of the paint curtain. At this time, in order to obtain a thin film thickness on the object to be coated, it is necessary to reduce the film thickness of the paint curtain, but there are limits to the properties such as viscosity of the paint, and the film thickness of the paint curtain can be reduced. If too much, the film thickness of the paint curtain becomes unstable, and uneven coating is likely to occur.
Therefore, when coating a thinner film, it is common to increase the conveyor transport speed.

On the other hand, the flow coater line is equipped with a drying furnace etc. on the downstream side of the line in order to dry the coated object coated in the coating section, and the line speed is controlled by the processing speed of the drying furnace etc. Is regulated.

For this reason, in the flow coater line, regarding the transport speed of the front conveyor and the rear conveyor, when the object to be coated is carried in from the upstream side of the line to the coating point side, and from the coating point side to the downstream side of the line When carrying out an object, the conveying speed of the front conveyor and the rear conveyor is set to a line speed, and the tip end to the tail end of the object to be coated pass through the coating point, and when the object to be coated is coated, they are It is necessary to set the transport speed of the front conveyor and the rear conveyor to a predetermined coating speed. That is, the conveyance speeds of the front conveyor and the rear conveyor need to be accelerated / decelerated between the above speeds.

[Problems to be solved by the invention] However, in the coating material conveying device of the flow coater line, the loading timing of the front conveyor of the coating material to be newly loaded from the upstream side of the line to the coating point is set to the front side. It is set after the conveyor speed has been reduced from the coating speed to the line speed. Here, the transport speed of the front conveyor is reduced from the coating speed to the line speed after the tail end of the preceding object to be coated passes through the front conveyor. Therefore, the subsequent coating object cannot be carried into the front conveyor while the preceding coating object is present on the front conveyor, and the conveyance pitch of the preceding and succeeding coating objects is longer as the length of the front conveyor in the conveyance direction is longer. ,become longer.

Further, the length of the front conveyor in the transport direction needs to be the longest length of the object to be coated that can be processed by the flow coater line.

Therefore, for a short object to be coated, the length in the conveying direction of the front conveyor, which is determined based on the length of the long object to be coated, becomes longer than necessary. Since the object to be coated cannot be carried into the front conveyor while the object is present on the front conveyor, as a result, the conveyance pitch of the preceding and subsequent objects to be coated becomes longer than necessary, and the productivity of the line decreases.

The present invention, in the flow coater line, when adjusting the film thickness of the coating object by adjusting the conveyor transport speed,
It is an object of the present invention to improve the productivity by shortening the conveyance pitch of the material to be coated before and after passing the coating point as much as possible.

[Means for Solving the Problem] The present invention, before and after the coating point where the paint curtain hangs,
In a flow coater line coating object transporting device, which is configured by arranging a front conveyor and a rear conveyor for transporting an object to be coated, the front conveyor is divided into a plurality of transport directions, and the transport directions of the divided front conveyors. The length of the rear conveyors can be expanded and contracted with each other, and the conveyance speed of at least the division front conveyor closest to the coating point among the division front conveyors can be accelerated and decelerated, and the rear conveyor is divided into a plurality in the conveyance direction. In addition, it is configured such that the conveying speed of at least the divided rear surface conveyor closest to the coating point among the divided rear surface conveyors can be accelerated or decelerated.

[Operation] According to the present invention, after the entire object to be coated is placed on the division front conveyor which can be accelerated and decelerated from the conveyor operating at the upstream line speed, the front conveyor and the division rear conveyor which can be accelerated and decelerated are started to accelerate. In order to obtain a predetermined coating film thickness in the coating section, the respective conveying speeds of the divided front conveyor and the divided rear conveyor are set to the line speed (V Acceleration from _L ) to coating speed (V _H ) must be completed. Then, after the entire article to be coated is placed on the divided rear surface conveyor, before the tip of the object to be coated enters the conveyor operating at a line speed downstream from the divided rear surface conveyor, the divided rear surface conveyor The transfer speed must be reduced from the coating speed ( _VH ) to the line speed ( _VL ). Therefore, when the length of the transported object is l _s , the length in the transport direction of the split front conveyor required for acceleration / deceleration
l _ce , and the length l _co in the conveying direction of the divided rear surface conveyor required for acceleration / deceleration are as shown in the following equations (1) and (2).
Incidentally, l _b afford length up to division front conveyor is complete acceleration, alpha is the acceleration and deceleration rate of the divided rear conveyor with divided front conveyor.

In the present invention, the length l _ce of the front conveyor that can be accelerated and decelerated in the conveying direction is set to the length l _{s of the} object to be coated this time.
Use it according to your needs. On the other hand, the length l _co in the conveying direction of the rear conveyor that can be accelerated and decelerated may be configured to expand and contract according to the length l _{s of the} object to be coated this time, or various objects to be treated handled by the line. The maximum length l _comax may be fixed to the maximum length l _smax .

Therefore, in the present invention, the conveyance direction length of the dividing front conveyor that can be accelerated and decelerated is set according to the length of the object to be coated this time, and if necessary, the conveyance of the divided rear conveyor that can be accelerated and decelerated is set. Also set the direction length.

Then, by accelerating and decelerating the conveyance speed of the division front conveyor and the division rear conveyor that can accelerate and decelerate between the line speed and the coating speed required to apply the coating film thickness of this time, It is possible to carry out coating that gives a desired coating film thickness.

Therefore, when the length of the object to be coated is short, it is possible to set the length of the divided front conveyor that can be accelerated / decelerated to a short length, and as a result, the conveyance pitch of the object to be coated is shortened,
Productivity can be improved.

[Embodiment] FIG. 1 is a schematic view showing an object conveying apparatus of the present invention, and FIG. 2 is a schematic view showing a front conveyor.

As shown in FIG. 1, the flow coater 10 causes a paint curtain 12 to flow down through a gap between nozzles of a paint supply header 11.
Before and after the coating point where the paint curtain 12 hangs,
A front conveyer 20 and a rear conveyer 30 for transporting the are separated from each other. 14 is a saucer for collecting paint.

The front conveyor 20 is, as shown in FIGS. 1 and 2, the first divided front conveyor on the side closer to the coating point in the transport direction.
21 and a second divided front conveyor 22 on the side far from the coating point.

The first division front conveyor 21 can accelerate and decelerate the transfer speed by controlling a drive motor 24 connected to a drive pulley 23.
The second divided front conveyor 22 can accelerate and decelerate the conveyance speed by controlling a drive motor 26 connected to a drive pulley 25.

The first divided front conveyor 21 is wound around movable pulleys 27A and 27B that can move in the transport direction, and the second divided front conveyor 22 is wound around movable pulleys 28A and 28B that can move in the transport direction. As a result, both split front conveyors 2
1, 22 are those movable pulleys 27A, 27B, movable pulley 28A,
The movement along the transport direction of 28B, can stretch their conveying direction length l _ce1, l _ce2 each other.

As shown in FIG. 1, the rear conveyor 30 is divided into two, in the transport direction, a first divided rear conveyor 31 on the side closer to the coating point and a second divided rear conveyor 32 on the side farther from the coating point. There is.

The first division rear conveyor 31 can accelerate and decelerate the conveyance speed by controlling the drive motor 34 connected to the drive pulley 33,
The second divided rear conveyor 32 can accelerate and decelerate the conveying speed by controlling a drive motor 36 connected to a drive pulley 35.

The rear conveyor 30 has fixed lengths in the conveying direction of the first divided rear conveyor 31 and the second divided rear conveyor 32, respectively, and the lengths l _co1 and l of the divided rear conveyors 31 and 32 are the same.
The total length of _co2 is set to the maximum length l _comax that can correspond to the maximum length of the objects to be coated 13 handled by the line. However, the two divided rear surface conveyors 31 and 32 may be configured such that their lengths in the conveying direction can be expanded and contracted with each other, as in the case of the two divided front surface conveyors 21 and 22 of the front surface conveyor 20.

In FIGS. 1 and 2, 41 is an upstream line conveyor, 42 is a downstream line conveyor, and 43 is a drying furnace.

 The operation of the flow coater 10 will be described below.

When using the flow coater 10, after the entire object 13 to be coated is placed on the divided front conveyors 21, 22 which can be accelerated and decelerated from the conveyor operating at the upstream line speed, the divided front conveyors 21,
22 and the divided rear surface conveyors 31 and 32 capable of accelerating and decelerating are started to accelerate, but in order to secure a predetermined coating film thickness in the coating part, before the tip of the article to be coated 13 enters the coating part, It is necessary that the respective conveying speeds of the divided front conveyors 21, 22 and the divided rear conveyors 31, 32 have been completely accelerated from the line speed ( _VL ) to the coating speed ( _VH ). Then, after the entire article 13 to be coated is placed on the divided rear conveyors 31, 32, the tip of the object 13 enters the conveyor operating at a line speed downstream from the divided rear conveyors 31, 32. Before that, it is necessary that the conveying speed of the rear conveyors 31, 32 has been reduced from the coating speed (V _H ) to the line speed ( _VL ). Therefore, in the flow coater 10, the length of the transported object 13 to be coated this time
Divided front conveyor required for acceleration / deceleration for l _s 2
The transport direction length l _ce of 1 and 22 is obtained by the above equation (1), and the transport direction length l _co of the divided rear surface conveyors 31, 32 required for acceleration / deceleration is obtained by the above equation (2).

And in the flow coater 10, the following (A),
As shown in (B), the division conveyor to be used as the acceleration / deceleration conveyor is selected from the front conveyors 20, and the division conveyor to be used as the acceleration / deceleration conveyor is selected from the rear conveyors 30.

(A) The length l _{s of the} object to be coated 13 this time is short, and the required acceleration / deceleration conveyor length l _ce obtained by the above formula (1) is the maximum conveyance direction length l _{ce1max of} the first division front conveyor 21. Shorter, the required acceleration / deceleration conveyor length l _co obtained by the above equation (2)
Is shorter than the fixed conveying direction length l _co1 of the first divided rear conveyor 31, the first divided front conveyor 21 and the first divided rear conveyor 31 are accelerated and decelerated between the line speed and the coating speed. Used as a first division front conveyor
The length of 21 in the conveying direction is set to the length l _ce defined by the above formula (1) within the range of the variable paint length. At this time, the second divided front conveyor 22 and the second divided rear conveyor 32 are always operated at the line speed.

(B) On the other hand, the length l _{s of the} object to be coated 13 is long,
The required acceleration / deceleration conveyor length l _ce determined by the above equation (1) is longer than the maximum conveyance direction length l _{ce1max of} the first divided front conveyor 21, and the required acceleration / deceleration conveyor length l obtained by the above equation (2)
_{When co} is longer than the fixed conveyance direction length l _co1 of the first divided rear conveyor 31, the first divided front conveyor 21 and the second divided front conveyor 22, the first divided rear conveyor 31 and the second divided rear conveyor 32 are set. It is used as an acceleration / deceleration conveyor that accelerates / decelerates between line speed and coating speed.

Then, in the flow coater 10, the respective conveying speeds of the above-mentioned divided front conveyors 21, 22 and the divided rear conveyors 31, 32 defined as the accelerating / decelerating conveyors are applied to the line speed and the coating film thickness of this time. By accelerating and decelerating at a required coating speed, it is possible to carry out coating to give the desired coating film thickness to the article to be coated 13.

Therefore, when the length of the object to be coated 13 is short, the length of the dividing front conveyor that can accelerate and decelerate can be set short, and as a result, the conveyance pitch of the object to be coated 13 before and after can be shortened to improve the productivity. Can be improved.

In the implementation of the present invention, the number of conveyor divisions in each of the front and rear conveyors may be three or more.

[Advantage of the Invention] As described above, according to the present invention, in the flow coater line, when the film thickness of the coating object is adjusted by adjusting the conveyor transportation speed, the transportation of the coating material after the coating point is passed. The pitch can be shortened as much as possible and the productivity can be improved.

[Brief description of drawings]

FIG. 1 is a schematic view showing an object conveying device of the present invention, and FIG.
The figure is a schematic view showing a front conveyor. 10 ... Flow coater, 12 ... Paint curtain, 13 ... Painted object,
20 ... Front conveyor, 21 ... 1st division front conveyor, 22 ... 2nd division front conveyor, 30 ... Rear conveyor, 31 ... 1st division rear conveyor, 32 ... 2nd division rear conveyor.

Claims (1)

[Scope of utility model registration request] Claims: 1. Before and after the coating point where the paint curtain hangs,
In a flow coater line coating object transporting device, which is configured by arranging a front conveyor and a rear conveyor for transporting an object to be coated, the front conveyor is divided into a plurality of transport directions, and the transport directions of the divided front conveyors. The length of the rear conveyors can be expanded and contracted with each other, and the conveyance speed of at least the division front conveyor closest to the coating point among the division front conveyors can be accelerated and decelerated, and the rear conveyor is divided into a plurality in the conveyance direction. In addition, the transporting apparatus for coated objects in a flow coater line is characterized in that the transporting speed of at least the split rear surface conveyor closest to the coating point among the split rear surface conveyors can be accelerated and decelerated.