JPS585714B2 - How to paint shaped steel - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for painting section steel.

Conventionally, as shown in FIGS. 1 and 2, the method for painting shaped steel has been to tilt the painting guns 1-1 and 1-2 at a predetermined angle θ with respect to the horizontal plane. -2 are arranged facing each other at a distance l1 in the width direction of the shaped steel 2, and are arranged so that the painting patterns from the facing painting guns 1-1 and 1-2 do not interfere with each other. As shown in the figure, the shaped steel 2 is arranged at a distance 12 apart in the length direction according to the width of the coating pattern, and while the painting guns 1-1 and 1-2 are reciprocated in the width direction of the shaped steel, Painting was performed while simultaneously controlling on/off the spraying of paint from painting guns 1-1 and 1-2 at appropriate positions and at appropriate timings.

Note that 3 indicates a table roller that moves the section steel 2.

When using the conventional painting method as described above, the painting gun 1
The distance l1 between -1 and 1-2 is, for example, in the case of H-beam steel,
The distance is given by the following formula.

That is, l1=2 (h-F/4)cotθ.

Here, h is the distance from the tip of the painting gun 1-1, 1-2 to the web surface of the H-section steel, and F is the flange width of the H-section steel.

Therefore, unless the spacing l1 between the painting guns is changed each time a section steel having a different shape and size is painted, unpainted areas and overspray may occur.

In addition, the distance l1 becomes a very large value depending on the shape and dimensions of the shaped steel, and the gun support member for arranging the pair of painting guns 1-1 and 1-2 has to be made very long. Moreover, this also has the disadvantage that the gun supporting member must be strong and large in consideration of problems with stability and strength of the gun supporting member during reciprocating movement of the painting gun.

Furthermore, as shown in Figure 2, since the shaped steel is shifted by a distance l2 in the longitudinal direction to avoid interference between the coating patterns, the coating guns at both ends of the shaped steel can be turned on and off.
In order to eliminate unpainted overspray in off-control, it is necessary to provide a mechanism for controlling the painting guns 1-1 and 1-2 at different positions and timings, which makes the painting control mechanism complicated. There were also some drawbacks.

The object of the present invention is to provide a coating method that eliminates the above-mentioned drawbacks.

According to the present invention, this purpose is achieved by using first and second paints which are inclined at a predetermined angle with respect to the horizontal plane and are arranged so that the paint spraying directions are opposite to each other when viewed in the width direction of the section steel. At least a pair of painting guns consisting of painting guns are reciprocated in the width direction of the section steel, and in the outward movement, after the first painting gun finishes spraying the paint, the paint is sprayed from the second painting gun. On the return trip, after the second painting gun finishes spraying the paint, the first and second painting guns spray the paint so that the first paint gun sprays the paint. This is achieved by controlling injection on and off.

The method of the present invention will be explained below using examples.

FIGS. 3 to 6 are explanatory diagrams of embodiments to which the method of the present invention is applied.

As shown in Fig. 3, the painting guns 1-1 and 1-2 have an angle θ with the horizontal plane connecting their tips.
They are arranged so that they cross each other so that the spraying directions of the paint are opposite to each other when viewed in the width direction of the shaped steel 2.

The painting guns 1-1 and 1-2 are spaced apart by a distance 12 as shown in FIG.

Note that the distance l2 may be any value from 0 as described later.

Further, 4 is a support member that supports and moves the painting guns 1-1 and 1-2.

A pair of painting guns 1-1 and 1-2 arranged to intersect as described above are installed so as to be able to reciprocate in the width direction of the shaped steel 2, as shown in FIG.

This may be done by a conventional method.

For example, when a gun carrier is driven by a drive pin fixed to a gun drive chain and the gun drive chain moves in a fixed direction between two sprocket wheels, the gun carrier is configured to reciprocate between both sprocket wheels, and the gun carrier One end of the gun support member 4 may be fixed in the center, and the painting guns 1-1 and 1-2 may be integrally moved back and forth in the width direction of the shaped steel 2 in synchronization with the reciprocation of the gun carrier. .

Therefore, the reciprocating path of the painting guns 1-1 and 1-2 is defined as from point C to point F.

First, at point C, the extension line of the axis of the painting gun 1-1 intersects at the center of the width of the flange of the section steel, for example, H section steel 2, and at point F, the extension line of the axis of the painting gun 1-2 intersects at the center of the width of the flange of the section steel, for example, H section steel 2. It is assumed that they intersect at the center of the width of the other flanges of the section steel 2.

Now, on the outward journey where the painting guns 1-1 and 1-2 are moved together from point C to point F, paint is supplied to the painting gun 1-1 while moving from point C to point D. The paint is injected from the painting gun 1-1, and during the movement from point E to point F, the paint is supplied to the painting gun 1-2 and the paint is sprayed from the painting gun 1-1.
The paint supply is controlled on and off so that the paint is sprayed from 2.

Here, point D is the position where the extension line of the axis of the painting gun 1-1 intersects with the flange end B, and point E is the position where the extension line of the axis of the painting gun 1-2 intersects with the flange end A. It is.

Also, on the return trip when the painting guns 1-1 and 1-2 move from point F to point C, paint is supplied to the painting gun 1-2 during movement from point F to point E. 1-2, and during the movement from point D to point C, the paint is supplied to the paint gun 1-1, and the paint supply is turned on so that the paint is jetted from the paint gun 1-1. Control off.

Therefore, the outer flange part on the flange end A side, the flange end B
The inner flange part on the flange end B side and the inner flange web part on the flange end B side are painted with the painting gun 1-1, and the outer flange part on the flange end B side, the inner flange part on the flange end A side, and the inner flange part on the flange end A side are painted. The flange side web part is painted with painting gun 1-2, so that H
As the steel section 2 advances in the length direction, the upper half of the H section steel 2 is painted.

Further, the lower half side of the H-shaped steel 2 can also be painted in the same manner.

The setting of the coating start point or coating stop point is based on the inclination angle θ of the coating guns 1-1 and 1-2 with respect to the horizontal direction, the horizontal plane of the tips of the coating guns 1-1 and 1-2, and the H-shaped steel 2. The above-mentioned points C, D, E, and F may be determined based on the distance h between the webs and the flange width of the H-section steel 2.

Therefore, points C, D, E, and F are determined by considering the tilt angle θ of the painting gun, and the supply of paint to the painting guns 1-1 and 1-2 is turned on at each point. - By accurately performing off control, it is possible to obtain a uniform coating film thickness on the flange surface and web surface of the H-section steel 2, reduce overspray, and eliminate unpainted areas.

Furthermore, since the painting guns 1-1 and 1-2 are arranged in opposite directions, their respective painting patterns do not interfere with each other.

Therefore, the distance l2 between the painting guns 1-1 and 1-2 in the longitudinal direction of the shaped steel 2 can be set to any value from l2=0.

Now, if the interval l2 is l2■0, the painting guns 1-1 and 1-2 are controlled at the same position and at the same timing in the on/off operation of painting control in the longitudinal direction of the section steel 2. There is no inconvenience at all.

Next, an example of on/off control of the painting guns 1-1 and 1-2 will be explained.

This example is an example in which a preset counter is used.

The device of this example includes a clock pulse oscillator that oscillates clock pulses synchronized with the moving speed of the gun support member 4, a counter that counts the output of the clock pulse oscillator, and a clock pulse oscillator that oscillates clock pulses synchronized with the moving speed of the gun support member 4, a counter that counts the output of the clock pulse oscillator, and a It consists of a setting section in which preset values are stored.

Now, as shown in FIG. 7, the gun support member 4 is at point H and point G.
It is assumed that the robot moves back and forth using the point as the turning point.

FIG. 7a is a diagram in which turning points H and G and the upper end passing line of the gun carrier indicated by straight line a are added to FIG. 5.

The setting section has preset sections corresponding to the painting guns 1-1 and 1-2, respectively, and the presetting section for the painting gun 1-1 sets the clock pulse count value from the count start position J as shown in Fig. 7c. Points C and D are respectively set as shown in FIG. 7, and points E and F are similarly set as shown in FIG. Outputs a signal to the corresponding paint gun when the set point is reached.

Note that FIG. 7b shows a clock pulse.

Now, the outward path of moving the gun support member 4 from point G to point H will be explained.

The gun carrier moves, and at the count start position J, the count start sensor detects the striker of the gun carrier, generates a count start signal, and the counter starts counting clock pulses from the clock pulse generator.

The count of the counter progresses in synchronization with the movement of the painting guns 1-1 and 1-2, and when the count value corresponding to the first set point C of the setting section is reached, the counter advances to the painting gun 1-1. The on/off valve that supplies the paint is turned on and held there.

Next, the painting guns 1-1 and 1-2 advance, and when the count value of the counter reaches the count value corresponding to the second set point D of the setting section, the paint is supplied to the painting gun 1-1. The hold state of the off valve in the on state is released and it becomes in the off state.

Also, when the painting guns 1-1 and 1-2 advance and the count value of the counter reaches the count value corresponding to the third set point E of the setting section, the paint is supplied to the painting gun 1-2.
The off valve is turned on and held as it is.

Then, when the painting guns 1-1 and 1-2 advance and the count value of the counter reaches the count value corresponding to the fourth set point F of the setting section, the paint is supplied to the painting gun 1-2.・The off valve is released from being held in the on state and becomes the off state.

Then, when the painting guns 1-1 and 1-2 advance and the gun carrier reaches the reversal position H point, the direction of movement of the gun carrier is reversed and the gun carrier travels in the direction from the H point to the G point.

On the return trip, the painting guns 1-1 and 1-2 move from point H and the count value of the counter reaches the fifth set point F of the setting section.
When the count value corresponding to is reached, the on/off valve for supplying paint to the painting gun 1-2 is turned on and held.

Then, when the counter reaches the count value corresponding to the sixth set point E, the paint gun 1-2 is supplied with paint.
Release the on state of the off valve and turn it off.

Then, when the counter reaches the count value corresponding to the seventh set point D, the paint gun 1-1 is supplied with paint.
Turn the off valve on and hold it.

Then, when the counter reaches the count value corresponding to the eighth set point C, the paint gun 1-1 is supplied with paint.
Release the on state of the off valve and turn it off.

At the eighth set point C, the on-off valve is turned off.

Further, when passing the count start point J on the return trip, the count value of the counter is reset by the count start sensor.

The gun carrier advances to point G, reverses direction at point G, and repeats the same action as above.

This is an example of a case where an up counter is used as the counter, but it is also possible to use an up/down counter to switch to a down counter on the return trip at turnaround point H. In this case, it is possible to reduce the number of set values in the setting section. can.

FIG. 7e shows the opening/closing signal of the on/off valve that supplies paint to the painting gun 1-1, and f shows the opening/closing state of the on/off valve that supplies paint to the painting gun 1-2.

Further, although the case where one pair of painting guns 1-1 and 1-2 is used has been described above, there is no problem even if there is one or more pairs.

As explained above, according to the method of the present invention, the painting gun 1-
1 and 1-2 can be made close to each other, so the interval l1 between the painting guns in the width direction of the section steel can be set to any value from l1=0.

In addition, the interval l1 does not need to be changed each time the type, size, or shape of the shaped steel is changed, which improves the efficiency of the painting operation.

Further, since the shape of the gun support member can be simplified and its size can be reduced, there is an effect that problems regarding stability and strength of the gun support member can be eliminated.

Furthermore, the spacing l2 between the painting guns in the longitudinal direction of the shaped steel can be made close to zero, and the on/off operation of the painting control of the pair of painting guns in the longitudinal direction of the shaped steel can be performed at the same position. Control can be performed at the same timing, and a control device for shifting the timing is not required.

[Brief explanation of drawings]

Figure 1 is an elevational view of the conventional painting method. Figure 2 is a plan view of the conventional painting method. FIG. 3 is a diagram showing an example of a coating gun apparatus according to the method of the present invention. FIG. 4 is a plan view of an embodiment to which the method of the present invention is applied. FIG. 5 is an elevational view of an embodiment to which the method of the present invention is applied. FIG. 6 is a side view of an embodiment to which the method of the present invention is applied. FIG. 7 is a diagram for explaining on/off control of the painting gun. 1-1 and 1-2: Painting gun, 2: Shaped steel, 3: Table roller, 4: Gun support member.

Claims (1)

[Claims] 1. At least a pair of first and second painting guns that are inclined at a predetermined angle with respect to the horizontal plane and arranged so that the paint spraying directions are opposite to each other when viewed in the width direction of the shaped steel. The painting gun is reciprocated in the width direction of the shaped steel, and on the outward trip, after the first painting gun finishes spraying the paint, the second painting gun sprays the paint, and on the return trip, the paint is sprayed from the second painting gun. A shaped steel characterized in that the spraying of paint from a painting gun is controlled on and off so that after the spraying of paint from a second painting gun is completed, the paint is sprayed from a first painting gun. Painting method.