JPH0429426B2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention provides a picture frame painting method for painting a running steel plate to a predetermined thickness, leaving a predetermined width on the long side edges of the front and back surfaces of the steel plate. and equipment.

(b) Prior art When steel plates are coated with paint, etc., there are problems such as the paint decomposing during welding, releasing toxic gases, and causing welding defects such as blow holes.
A so-called picture-frame coated steel plate is manufactured in which a non-painted portion is formed on the side edge of the steel plate that serves as a weld line.

The frame-painted steel plate requires a transport platform for moving the steel plate,
Using a coating device equipped with a coating nozzle that moves upwards in the direction of the steel plate and sprays paint toward the steel plate, tape is applied in advance to the side edges of the steel plate that will be the non-painted areas before painting. It was manufactured by applying paint on top of it and then peeling off the tape after painting.

However, this method requires a lot of time and effort to apply and peel off the tape, and is not efficient. Therefore, when the steel plate passes through the painting area, a coating device places shielding plates close to the upper side along both side edges of the steel plate, and automatically forms non-painted areas on both side edges of the steel plate. was developed. With this device,
The work effort has been significantly reduced. However, even in this device, the paint adhered thickly to the shielding plate, and it could not be put to practical use unless it was cleaned regularly or continuously.

Therefore, a method has been proposed in which picture frames are painted simply by controlling on/off of a paint spray gun without using a shielding plate. This method includes the single method, in which a single spray gun reciprocates in the width direction of the steel plate for painting, and the main spray gun that reciprocates in the center of the steel plate in the width direction, and the secondary spray gun that reciprocates in the long side edges. There is a double method in which painting is performed using

However, in the single method, as shown in Figure 7A, excessive coating occurs on the long side edges, and to prevent this, the head of the spray gun is shaken when it approaches the long side edges. However, as shown in FIG. 7B, an insufficient coating film is produced and the boundary line with the non-coated area is disturbed.

Furthermore, in the double method, as shown in FIGS. 7C and 7D, variations in coating film thickness occur at the long side edges, which is not desirable in terms of quality.

(C) Problems to be Solved by the Invention The problems to be solved by the present invention are to equalize the coating thickness on the long side edges and to unpaint the unpainted areas when painting using a paint spray gun. The objective is to obtain a coating method that improves the linearity of the boundary line between the two.

(d) Means for Solving the Problems The steel plate picture frame painting method of the present invention is carried out in a painting line that coats a running steel plate to a desired thickness while leaving a predetermined width on one or both long side edges of the steel plate. , an image sensor is provided at the entrance of the coating line to detect the timing of the steel plate entry and the width of the steel plate; a pair of first coating spray guns capable of horizontal movement and tilting in a vertical plane are connected to the image sensor; The above-mentioned image
Based on the detection signal from the sensor, the first painting spray gun is horizontally moved toward the center line by a predetermined distance from the long side edge of the steel plate while spraying paint onto the steel plate, and then moved toward the center line by a predetermined distance toward the center line. installing a second painting spray gun capable of tilting by an angle, moving horizontally, and tilting in a vertical plane on the entry side or exit side of the first painting spray gun and facing near the center of the steel plate; Based on the detection signal from the image sensor, the second painting spray gun is horizontally moved back and forth a predetermined distance toward the long side edge in the width direction of the steel plate while spraying paint onto the steel plate; The above problem is solved by tilting a predetermined angle toward the long side edge when it reaches the vicinity of the long side edge.

Further, the steel plate picture frame painting device of the present invention is installed at the entrance of a painting line that paints a running steel plate to a desired thickness by leaving a predetermined width on one or both long side edges of the steel plate. an image sensor for detecting when the steel plate enters the line and the width of the steel plate; and an image sensor installed on the exit side of the image sensor and symmetrically with respect to the center line of the painting line toward the long side edge. a pair of first painting spray guns that can be moved horizontally and tilted in a vertical plane; and the first painting spray gun is configured to spray paint onto a steel plate based on a detection signal from the image sensor. a first painting spray gun drive mechanism that horizontally moves a predetermined distance from a long side edge of a steel plate toward the center line and then tilts a predetermined angle toward the center line; and an entry side of the first paint spray gun. or a second painting spray gun installed on the exit side and facing the center of the steel plate and capable of moving horizontally and tilting in a vertical plane; While spraying paint onto the steel plate, move the spray gun horizontally reciprocating a predetermined distance toward the long side edge in the width direction of the steel plate, and when it reaches near the long side edge, The above-mentioned problem is solved by a second painting spray gun drive mechanism that tilts a predetermined angle toward the spray gun.

(E) Embodiments The method of the present invention and the apparatus for carrying out the same will be explained with reference to FIGS. 1 to 3.

First, before we get into the specifics, let us clarify the following assumptions. The picture frame steel plate to which the present invention is directed is one that is coated to a desired thickness with a predetermined width left on the long side edges on both the front and back surfaces or on one side. The short edges of the steel plate are painted. For convenience of explanation, a case will be described below in which the front and back surfaces of the steel plate are coated.

Furthermore, in principle, the method of the present invention provides the same result even if the long side edges of the steel plate are painted first and then the central part is painted, or vice versa. Therefore, for convenience of explanation, the former painting process will be explained below.

The painting line 1 has a table roller 11 (second
Figure) A steel plate 2 is placed on top and fed into the coating equipment, and then the steel plate being coated is transported. A conventional side guide 12 is provided at the entrance of the painting line 1 to align the steel plate 2 with the center line 13 of the painting line 1.

Since the center line 13 is a virtual position, auxiliary reference lines 14 for determining the center line 13 are provided on both sides of the painting line 1. Side guide 1
2. Paint spray guns 4 and 6, which will be described later, are positioned with reference to this auxiliary reference line 14.

Based on the auxiliary reference line 14, a non-painting area A,
A side edge region B and a central region C are provided. The actual non-painting portion A ₀ on the steel plate 2 is provided in the non-painting area A. The side edge region B is made up of a single-layer part _B1 and a multi-layer part _B2 .

The picture frame painting device of the present invention includes an image sensor 3, a pair of first painting spray guns 4, a first painting spray gun drive mechanism 5, a second painting spray gun 6, and a second painting spray gun drive mechanism. It is made up of 7.

The image sensor 3 is provided on the exit side of the side guide 12 and detects the timing of entry of the steel plate 2 and the width of the steel plate. The detection signal is sent to a central controller (not shown).

1st painting spray gun drive mechanism (hereinafter referred to as 1st painting spray gun drive mechanism)
It is called a mechanism. ) 5 is a trolley 51, a bracket 52,
It is made up of hydraulic cylinders 53 and 54. The trolley 51 is arranged on the exit side of the image sensor 3 and symmetrically with respect to the center line 13 of the painting line 1,
It is placed on a rail 511. The truck 51 is moved forward and backward with respect to the centerline 13 by a fluid pressure cylinder 53. A bracket 52 is fixed to the top and middle portion of the truck 51 and extends toward the centerline 13. A first painting spray gun 4 is attached to the tip of the bracket 52 so as to be tiltable. The spray gun 4 is tilted by a hydraulic cylinder 54 attached to a bracket 52.

Control signals from a control device (not shown) are sent to each hydraulic cylinder 53, 54 to control the operation of the spray gun 4.

With the above configuration, the first painting spray gun 4
are opposed to the long side edges of the steel plate 2 symmetrically with respect to the center line 13, move horizontally in the width direction of the steel plate 2, and tilt in the horizontal movement direction within the vertical plane of the steel plate 2.
Horizontal movement is performed by a fluid pressure cylinder 53, and tilting is performed by a fluid pressure cylinder 54. These operations can also be performed by other conventional screw mechanisms, gear mechanisms, and link mechanisms.

The spray gun 4 and the first mechanism 5 are connected to the center line 13
One pair is provided symmetrically on the left and right sides of the upper and lower sides.

2nd painting spray gun drive mechanism (hereinafter referred to as 2nd painting spray gun drive mechanism)
It is called a mechanism. ) 7 is a support stand 71, a motor 72,
It is made up of a chain 73 and a carriage 74.

The support stand 71 is installed astride the coating line 1 in a direction perpendicular to it. The support stand 71 has beams 711 on the top and bottom.
A carriage 74 is attached to these so as to be horizontally movable and tiltable in the horizontal movement direction within the vertical plane of the steel plate 2. A second painting spray gun 6 is fixed to the carriage 74. A sprocket 721 is rotatably supported on the upper and lower beams 711, and a chain 73 is stretched between these.
Each end portion is fixed to the left and right side surfaces of the carriage 74 on one side. Each sprocket 721 is attached to the upper beam 71
Chain 73 by motor 72 fixed to
It is rotated by rotating it.

When the motor 72 is started, the carriage 74 horizontally moves to the right or left along the beam 711 depending on the direction of rotation. The spray gun 6 attached to the carriage 74 is attached to the vertical surface of the steel plate 2 around the axis of the carriage 74 by a power transmission mechanism such as a conventional hydraulic mechanism, screw mechanism, gear mechanism, link mechanism, belt or chain, etc. is tilted within the horizontal movement direction. As an example, a tilting mechanism using a hydraulic cylinder mechanism is shown in FIG.

Control signals from a control device (not shown) are sent to the motor 72 and the aforementioned tilting mechanism to control the operation of the spray gun 6.

With the above configuration, the second painting spray gun 6
is installed on the outlet side (or the inlet side) of the first painting spray gun 4 and facing the center of the steel plate 2.

(f) Effects The effects of the method of the present invention are shown in Figures 1 to 3.
This will be explained with reference to the figures.

The center of the steel plate 2 before painting is aligned with the center line 13 of the painting line 1 by a side guide 12. The image sensor 3 detects the approach of the steel plate 2 and the plate width. The detection signal is sent to the central control device, and based on the manufacturing specifications, the coating area A, the side edge area B, the central area C, the non-coating area A ₀ , the single layer area B ₁ ,
Determine the multilayer part B ₂ .

The conveyance speed of the steel plate 2 is detected from the rotation speed of the table roller 11 and sent to the control device. The control device sends control signals to each drive mechanism 5, 7 to control the operation of each spray gun 4, 6.

As shown in Fig. 3, the spray gun 4 moves horizontally by a distance _B1 while spraying paint onto the steel plate from a position that is a predetermined distance _A0 from the side edge of the steel plate toward the center line of the steel plate width, and then moves horizontally to the center line of the steel plate. While tilting the spray gun 4 by a predetermined angle θ ₁ to the side, paint is sprayed over a distance B ₂ . The spray gun 6 horizontally moves the distance from one side edge of the central area C to the other side edge of the central area C while spraying the paint onto the steel plate, and then sprays at a predetermined angle θ ₂ toward the side edge of the steel plate. Spray paint over distance B ₂ while tilting the gun.

In the end, the range of distance B ₂ is for both spray guns 4 and 6.
The paint from above overlaps to form a multi-layer, with the same thickness as the other paint films.

The above operations are repeated sequentially and the picture frame painted steel plate 2
a (Fig. 1) is obtained. In the coating film of the steel plate 2a, portions _B1 and C are single-layered, and portion _B2 is multi-layered.

(g) Specific Example A thick steel plate with a thickness of 20 mm x width of 3200 mm x length of 12192 mm was conveyed at a rate of 2.5 m/min, and the width A ₀ of the non-coated part was set to 50 mm. The overall coating conditions are a film thickness of 30 μm±5 μm, a width B of the pre-coating zone of 150 mm, and a moving width C of the second coating spray gun 6 of 2800 mm.

The traverse speed of the second painting spray gun 6 is set to 18 m/
Spray continuously with a pattern length of 0.8 m. Swing angle (tilting angle) of spray gun 6 θ ₂
to (45°). The traverse width B ₁ of the first painting spray gun 4 is 50 mm, the traverse speed is 45 m/min, and the required time for reciprocating movement is every 3 seconds, during which time the spray gun sprays while moving toward the center line of the board width. , the remaining 1.5 seconds were decided to retreat to the initial position without spraying. Swing angle θ ₁ of spray gun 4 (45°)
Make it.

When painting was carried out under the above conditions, it was possible to paint a picture frame with smoothness and good linearity as shown in FIG.

(H) Effect Setting the coating film thickness to 30±5 μm and the uncoated area width A ₀ = 50 mm, as shown in Fig. 5, the distance l from the long side edge of the steel plate 2 and the coating film thickness t at that position are calculated. Figure 4 shows the actual measurement results. Comparative Example 1 is a double method using a main gun and a sub gun, and only the sub gun is oscillated. Comparative Example 2 was a single method using only the main gun, and the head was oscillated.

As is clear from FIG. 4, according to the method of the present invention, the boundary between the painted portion and the non-painted portion at the long side edge of the steel plate is clear, and the coating film thickness is approximately uniform. As a result, there is no variation in color tone, and no cracking of the coating film occurs during bending.

[Brief explanation of drawings]

FIG. 1 is a plan view of a picture frame painting apparatus that implements the method of the present invention. FIG. 2 is a front view taken from the - line in FIG. 1. FIG. 3 is a schematic explanatory diagram showing the picture frame painting method of the present invention. Figure 4 is a graph showing the state of coating film thickness by various coating methods. FIG. 5 is an explanatory diagram showing the measurement method shown in FIG. 4. FIG. 6 is an explanatory diagram showing the state of coating film thickness according to the method of the present invention. FIG. 7 is an explanatory diagram showing the state of coating film thickness according to the conventional method. FIG. 8 is a longitudinal sectional view showing the swinging mechanism of the second painting spray gun. 1: Painting line, 11: Table roller, 1
2: Side guide, 13: Center line, 14: Auxiliary reference line, 2: Steel plate, 3: Image sensor, 4:
1st painting spray gun, 5: 1st painting spray gun drive mechanism, 51: Trolley, 52: Bracket, 53, 54: Fluid pressure cylinder, 6: 2nd painting spray gun, 7: 2nd painting spray Gun drive mechanism, 71: support stand, 72: motor, 73: chain, 74: reciprocating table.

Claims (1)

[Claims] 1. In a painting line that paints a running steel plate to a desired thickness by leaving a predetermined width on one or both long side edges of the steel plate, an image sensor is installed at the entrance of the painting line to control the coating of the steel plate. A pair of first painting spray guns capable of detecting the timing of entry and the width of the steel plate, and capable of horizontal movement and tilting in the vertical plane are mounted on the exit side of the image sensor and symmetrically with respect to the center line of the painting line. The first painting spray gun may be installed toward the long side edge of the steel plate based on the detection signal from the image sensor, while spraying paint onto the steel plate, the first painting spray gun may be installed toward the center by a predetermined distance from the long side edge of the steel plate. A second painting spray gun that can be moved horizontally toward the line and then tilted by a predetermined angle toward the center line, and that can be moved horizontally and tilted in a vertical plane, is placed on the entry side of the first painting spray gun or The second painting spray gun should be installed on the exit side and toward the vicinity of the center of the steel plate, and the second painting spray gun should be installed on the long side in the width direction of the steel plate while spraying paint onto the steel plate based on the detection signal from the image sensor. A method for painting a picture frame of a steel plate, which comprises horizontally reciprocating a predetermined distance toward a side edge and tilting a predetermined angle toward the long side edge when reaching the vicinity of the long side edge. 2. In a painting line that coats a running steel plate to a desired thickness by leaving a predetermined width on one or both long side edges, there is a timer installed at the entrance of the painting line to control when the steel plate enters the line. an image sensor that detects the width of the image sensor; and an image sensor that is installed on the output side of the image sensor and symmetrically toward the long side edge with respect to the center line of the painting line, and that is resistant to horizontal movement and tilting in the vertical plane. a pair of first painting spray guns that can spray paint onto the steel plate based on a detection signal from the image sensor; a first painting spray gun drive mechanism that moves horizontally toward the line and then tilts it by a predetermined angle toward the center line; a second painting spray gun that is installed at the top and can be moved horizontally and tilted in a vertical plane, and the second painting spray gun sprays paint onto the steel plate based on a detection signal from the image sensor. A second reciprocating horizontal movement of a predetermined distance toward the long side edge in the width direction of the steel plate, and tilting a predetermined angle toward the long side edge when reaching the vicinity of the long side edge. A steel plate picture frame painting device consisting of a paint spray gun drive mechanism.