JPS5826985B2 - Automatic painting method for shaped steel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic coating method for shaped steel, such as H-shaped steel, T-shaped steel, channel steel, C-shaped steel, etc., which is automatically painted using a painting gun. It is something.

Conventionally, as shown in Fig. 1, as an automatic coating method for conveyed steel plates, the width of the steel plate is detected by a steel plate width detection sensor 3, and a coating instruction sensor C is used in conjunction with this.
There are some types that control the start and end of painting by placing the sensor a in the same phase as the steel plate width detection sensor a (relative to the width direction of the steel plate). With this sensor arrangement, the section steel is painted. In this case, as shown in Fig. 2, the painting guns d and e are placed facing each other at an angle so that they approach each other as they move forward when viewed in the width direction of the steel section being transported. If this method is adopted, there is a drawback that there will be uncoated areas on the flange surface of the section steel f and areas g where the coating film thickness is thin both at the start of painting and at the end of painting.

In addition, in automatic painting of steel plates, as shown in Figure 1, one end of the steel plate is normally regulated, and a coating instruction sensor is not placed on the other end (on the reference line side), but on the other end (on the side opposite to the reference line). Since the coating instruction sensor C is installed only in the case where the coating machine passes through the center, such as when automatically painting shaped steel, it is not possible to control the start and stop of painting on the other end of the shaped steel. Since the painting gun is in the painting state of 11 (1 = 1 in the free-spraying state), there was a drawback that the overspray loss of the paint was extremely large.

The present invention has been developed in view of the above-mentioned circumstances, and its purpose is to prevent unpainted areas and overspray losses on both outer flange surfaces of a shaped steel, and to prevent overspray loss when painting the upper and lower surfaces at the same time. The present invention aims to provide an automatic coating method for section steel that minimizes the overlap of the upper and lower spray patterns on both outer flange surfaces of the steel section, thereby reducing paint loss and making the coating film thickness uniform. .

Hereinafter, the method of the present invention will be explained with reference to the drawings from FIG. 3 onwards.

In the method of the present invention, the projection direction in which the paint is projected onto the shaped steel 1 being transported by the transporting table 2 is viewed in the width direction of the shaped steel 1 being transported, and the projection direction is such that the paint is projected closer to each other as it goes forward. At least one pair of painting guns 3a tilted and facing each other
, 3b are reciprocated in the width direction of the section steel 1 to be transported, and the web surface 1
a.

1 al/? :A coating instruction sensor 4a is set at a predetermined position corresponding to the coating start/end position of each coating gun 3a, 3b when projecting paint.

4b is characterized in that each of the painting guns 3a, 3bK gives instructions to start and end painting toward the center 1- of the outer flange surface 1b of the shaped steel 1 and the upper end 1e of the flange.

FIG. 3 and subsequent figures show an example in which the surface of an H-section steel as the section steel 1 is painted.

First, to explain the example shown in FIGS. 3-23 and 4 to which the present invention is applied, the conveying table 2 includes a large number of rollers 2a, which are rotationally driven by a rotational drive mechanism (not shown).
・ are arranged in parallel with each other at intervals, and the section steel 1 is placed on the conveying table 2 with its web surfaces ia, la
' is placed horizontally, and its seven flange surfaces 1b, lb' are placed perpendicular to the horizontal plane.

A pair of painting cans 3a are positioned above the steel section 1 being transported by the transporting chiffle 2 and are directed downward.

3b is arranged.

That is, the painting guns 3a and 3b are attached to both ends of a plane-shaped arm member 50 disposed above the shaped steel 1 to be transported, and as seen in the width direction of the shaped steel 1. Assemble them at an angle of depression θ with respect to the horizontal plane so that they approach each other,
The projection direction of the paint is tilted, and the distance L3 is set in the width direction of the shaped steel 1.
They are separated by a distance L4 in the longitudinal direction (conveying force direction) of the shaped steel 1 and are opposed to each other.

Further, to explain the reciprocating drive mechanism 6 that reciprocates the painting guns 3a, 3b in the width direction of the section steel 1, the arm member 5 to which the painting guns 3a, 3b are attached is connected to a support member 7 that can be expanded and contracted. The carrier member 8 is attached to a carrier member 8 through
1... so as to reciprocate in the width direction of the section steel 1.

Then, the painting instruction sensors 4a, 4b are connected, for example, to the side force at a distance L from the outer flange surfaces 1b, 1b of the section steel 1.
1. It is set at a position separated by L2, and the distance L1.
L2 is a sensor detection piece 12 corresponding to the inclination angle θ of the painting guns 3a and 3b and the painting instruction sensors 4a and 4b.
mounting position on the carrier member 8, painting guns 3a, 3
Painting start/end position buttons and shaped steel 1 for each of b
It is determined uniquely from the size of.

In the illustrated example, the distance L1. L2 is the same distance.

Assuming that the angle of inclination of the button and each painting gun 3a, 3b with respect to the horizontal plane is θ, and the mounting position of the sensor detection piece 12 is on a line passing through the center of the arm member 5, the distance L1. L2
is (flange width Ls of section steel 1) × tan (now 10) 1・
-1・-.

is given by

The painting instruction sensors 4a, 4b are composed of, for example, phototubes or proximity switches that detect the sensor detection piece 12. It is positioned with respect to the section steel 1 together with a section steel end detection sensor 4c, such as a phototube or a proximity switch, which performs a detection operation on the section steel 1, and is configured to give instructions for starting and finishing painting to the painting guns 3a and 3b. I have to.

That is, the right end 1d of the 7-lunge of the shaped steel 1 is detected by the shaped steel end detection sensor 4c, and the positions of the painting instruction sensors 4a and 4b interlocked with this are set.

In this state, if the painting guns 3a and 3b are reciprocated in the width direction of the section steel 1, the painting gun 3a.

3b is the position of painting instruction sensors 4a and 4b;
From the painting instruction sensors 1-4a and 4b to the center P of the outer flange surface 1b of the section steel 1 and the upper end of the flange 1, respectively.
The outer flange surface 1 is applied to the surface of the section steel 1 to be transported in response to a coating start/end signal for projecting paint toward c.
b and the inner flange surface 1b' to the upper web surface 1a, and the coating is automatically applied by continuously projecting the paint onto the upper web surface 1a.

To explain a specific example of the above-mentioned painting operation, as shown in FIG. The electromagnetic valves of the painting guns 3a and 3b are opened and closed via the relay C, and the supply and stop of the compressed air E causes the painting guns 3a and 3b to start and end painting operations.

That is, in FIGS. 3 and 5, when the carrier member 8 moves from the right side to the left force direction and the sensor-detection piece 12 is detected by the coating instruction sensor 4a, the detection signal causes the coating guns 3a, 3b to be activated. The solenoid valve opens and the painting guns 3a and 3b start painting.

These painting guns 3a and 3b continue painting when they receive the second detection signal from the painting instruction sensor 4b.

When the carrier member 8 further moves to the left and the coating instruction sensor 4b detects the sensor detection piece 12, the detection signal opens the memory element B of the circuit of the coating instruction sensor 4b, and the coating guns 3a, 3b The solenoid valve closes, and painting by the painting guns 3a and 3b is completed.

When the carrier member 8 moves from the left side to the right side, the painting control of the painting gun 3a3b is performed in the reverse order to that described above.

At that time, each of the painting guns 3a, 3b is activated by a painting instruction sensor 4a, 4b set at a predetermined position corresponding to the painting start/end position of each of the painting guns 3a, 3b.
By giving instructions to start and finish painting toward the center P button on the outer flange surface 1b of the section steel 1 and the flange upper end 1c, it is possible to prevent unpainted areas or overpainting on both needle sides 7 of the section steel 1 on the flange surfaces 1b and lb. No spray loss.

In the above, painting of the upper surface of the shaped steel 1 has been described, but the lower surface of the shaped steel 1 can be painted in the same manner as described above by turning the shaped steel 1 upside down after the upper surface has been painted.

In addition to the above-mentioned painting guns 3a and 3b, as shown by the two-dot chain line in FIG. By installing the above, it is also possible to paint the upper and lower surfaces of the section steel 1 at the same time.

Also, as shown by the two-dot chain line in Fig. 3, each painting gun 3
Painting instruction sensors 4a and 4b installed on the lower blade of the shaped steel 1 at predetermined positions determined in the same manner as above in accordance with the coating start and end positions of a and 3b instruct each of the painting guns 3a and 3b to start and end painting. You may also give

Further, in FIG. 6, the painting instruction sensor 4a is integrated with a shaped steel end detection sensor 4c similar to the above which detects the right end 1d of the flange of the shaped steel 1, and the painting instruction sensor 4b is integrated with the shaped steel end detection sensor 4c which detects the right end 1d of the flange of the shaped steel 1. Integrating with the same shaped steel end detection sensor 40' that detects the left end 1e of the flange of the steel 1, the shaped steel end detection sensor 4c detects the right end 1d of the flange of the shaped steel 1, and painting is performed in conjunction with this. The position of the indicating sensor 4a is set, and the position of the shape steel end detection sensor 40' is set.
This is an example of detecting the left end 1e of the flange of the shaped steel 1 and setting the position of the painting instruction sensor 4b that is linked to this.
Painting instruction sensors 4a, 4b, painting gun 3a
, 3b are controlled in the same manner as described above.

Further, FIGS. 7 and 8 show an example in which the present invention is applied to painting multiple rows, for example, two rows of section steel 1, 1', and FIG. 9 shows an example in which the present invention is applied An example of an apparatus for automatically painting the upper and lower surfaces of multiple rows of steel sections 1 and 1' at the same time, for example, two rows, was shown. Portions corresponding to those in FIG. 3 are given the same reference numerals.

Now, referring to FIG. 9, the carrier member 8 is connected to a drive motor 13 which is capable of forward and reverse rotation and which constitutes the reciprocating drive mechanism 6 via a reducer 14 and a chain 15, and is connected to the rail 10. A chain 17 is connected to a drive motor 16 that can reciprocate and rotate in forward and reverse directions, a chain wheel to which the chain 17 is passed, and a connecting rod 18 that will be described later and the boss of the chain wheel. a bevel gear 30 and a coating instruction sensor 4 connected via a connecting rod 18;
a, 4b and the shaped steel end detection sensor 4c on the rail 19.
A drive motor 21 that can be moved and positioned in the width direction of the shaped steel 1 on a drive motor 21 that can be rotated in the forward and reverse directions is provided with a chain 22, a chain wheel to which the chain 22 is passed, and a boss portion of the chain wheel. A bevel gear 31 provided between a connecting rod 23 to be described later. A painting instruction sensor 4a is connected to the rear end via a connecting rod 23.

4b and the shaped steel end detection sensor 4c' are connected to the rail 24°2.
5, in the width direction of the section steel 1' to set the position, and the coating operation can be performed by repeating the above-mentioned single row coating control for each row.

Last but not least, the present invention can also be applied to the painting of three or more rows of shaped steel, which has a larger number of rows than the above example, and the present invention can also be applied to a case where two or more pairs of painting guns 3a and 3b are installed instead of just one pair. The present invention can be applied in the same manner as above.

As explained above, in the present invention, the direction of the projection force for projecting paint onto the shaped steel being transported by the transporting table is viewed in the width direction of the shaped steel being transported, and the direction of the projection force approaches each other as it goes forward. reciprocating at least one pair of painting guns that are tilted and arranged oppositely in the width direction of the section steel to be transported,
When projecting paint from the flange surface of the section steel to the web surface, the single force of the pair of painting guns is controlled by a painting instruction sensor set at a predetermined position corresponding to the painting start/end position of each painting gun. The center of the outer flange surface of the section steel,
In addition, by giving instructions to start and end painting at the extreme positions where the other side projects the upper end of the 7-lunge of the section steel,
Painting as shown in FIG. 10 will be applied.

That is, in Fig. 10, the painting guns 3a and 3b move from the right to the left in the figure.
When painting (in the case of ■ in the figure) Painting starts - Painting gun 3 is activated by the instruction signal from sensor 4a.
The painting gun 3b starts painting toward a and P, and at the same time toward 1c.

Painting completed - Painting gun 3 is activated by the instruction signal from sensor 4b.
a toward 1c', and at the same time, the painting gun 3b completes painting toward P'.

When 3a and 3b move from left to right in reverse and paint, (in the case of ■ in the figure), follow the instruction signal of sensor 4b in the reverse order of the above, 10'
Painting starts toward P and P', and finishes toward P and 10 in response to an instruction signal from the sensor 4a.

The paint projection trajectory of the painting gun 3a is shown in a dark shaded area, and the paint projection trajectory of the painting gun 3b is shown in a dark shaded area.

Using the painting gun 3a, paint from point 1c' according to the path of the dark shaded area from point P (in the case of ■ in the figure, conversely from 1c/point to point P!) from the painting gun 3b at point 910. Paint at point P 1 according to the trajectory of the darkly shaded area (conversely from point P to point 1c in case of ■ in the figure).

Note that the outer surface of the flange and the lower surface of the shaped steel below points P and P' are treated in the same way as the upper surface of the shaped steel (as shown on page 9 of the specification, the direction of paint is directed upwards below the shaped steel). (by any means) with a painted paint gun.

Therefore, there is no uncoating or overspray loss on both outer flange surfaces of the section steel, and when painting at the top and bottom, the overlap of the upper and lower spray patterns on both outer flange surfaces of the section steel is minimized. This has the effect of reducing paint loss and making the coating film thickness uniform.

[Brief explanation of the drawing]

Figures 1 and 2 are front views showing different conventional painting methods, Figures 3 and 4 show a series of examples of the method of the present invention, Figure 3 is a front view, and Figure 4 is the same plane. 5 is a control system diagram of the coating instruction sensor, FIG. 6, FIG. 7, and FIG. 8 are front views showing different application examples of the method of the present invention, and FIG. 9 is a control system diagram of the coating instruction sensor. FIG. 10 is a front view showing an example of the apparatus to which the present invention is applied. 1, 1'-・・・Shaped steel, ia, 1a'...
...Web surface of the section steel, 1b...Outside flange surface of the section steel, 1b'...Inner flange surface of the section steel, 1c...Flange of the section steel Upper end, 2...
・Transportation table, 3a, 3b... A pair of painting guns, 4a, 4b... Painting instruction sensor, P... Center of the outer flange surface of the shaped steel.

Claims (1)

[Claims] 1. At least one at least one container arranged facing each other and tilted toward each other as viewed from the width direction of the shaped steel to be transported in the direction in which the paint is projected onto the shaped steel to be transported by the transport table. When moving the pair of painting guns back and forth in the width direction of the transported section steel and projecting paint from the flange surface of the section steel onto the web surface, the painting start and end positions of each painting gun are adjusted. A painting instruction sensor set at a predetermined position determines the extreme position where one force of the pair of painting guns projects the center of the outer flange surface of the section steel, and the other force projects the upper end of the flange of the section steel. An automatic method for painting section steel characterized by giving instructions to start and end painting.