JPS5833021B2 - Automatic painting equipment for shaped steel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to automatic painting equipment for section steel having various cross-sectional shapes.

For example, steel sheet piles have long been required to be painted with tar-epoxy paints to improve corrosion resistance, but when using tar-based paints, safety regulations (organic side , specialized standards, etc.), and for this reason, the current situation is that conventionally, a shaped steel manufacturing process equipped with equipment for painting shaped steel with tar-based paint has not been adopted.

Therefore, in order to perform painting with tar-based paint, it is necessary that the equipment satisfy the above-mentioned safety regulations and the equipment that satisfies the specifications required by the customer.

It is an object of the present invention to provide a section steel coating equipment that fully satisfies these requirements and automates the entire process of coating section steel.

The painting equipment of the present invention, which is a distant relative of the above object, includes a shot blasting device for cleaning the surface of a section steel to be painted;
A chain for preventing scattering of shot balls formed by suspending a large number of chains at the exit of the device, a wire brush for preventing scattering of shot balls provided at the rear of the chain,
a roller brush for preventing shot balls from scattering provided behind the brush; and an automatic coating device with an exhaust device that immediately automatically coats the shaped steel sent from the shot blasting device;
The present invention is characterized in that a drying surface plate for the shaped steel to be painted, which has a duct on the lower side and a push blower and a suction blower facing each other on the upper side, is arranged in sequence on the shaped steel transfer line.

With the above-mentioned configuration of the present invention, the coating film on the shaped steel to be painted can be stably and reliably formed, and the effect of meeting safety standards can be expected.One of the ways to obtain these effects is to use a shot blasting device and automatic coating. It is preferable to arrange it close to the coating device.

In other words, the longer the distance that the surface of the shaped steel to be painted whose oxide film has been removed by shot blasting is sent to the automatic coating device, the more condensed moisture will adhere to it due to contact with the atmosphere.
This is also one of the factors that promotes the formation of an oxide film again, making it difficult to reliably form a stable coating film (approximately 200 to 300 microns thick).

Therefore, in reality, it is desirable that the shot blasting device and the automatic coating device be located close to each other within several meters (preferably within 1 meter).

However, the closer these shot blasters and automatic coating equipment are, the more the shot blasting shots (iron powder, etc.)
The shot blasting equipment and the painting equipment should not be placed close together within 1 meter unless measures are taken to prevent this shot from scattering as it enters the automatic painting equipment together with the shaped steel to be painted and interferes with the painting work. I can't.

The present invention solves this problem by using a blow-off device 22, a chain 23 for preventing scattering of shot balls, a wire brush 24 for preventing scattering of shot balls, and a roller brush 25 for preventing scattering of shot balls, which will be described later.

In addition, the shaped steel to be painted that leaves the coating equipment is subjected to a quality inspection after being air-dried on a drying surface plate, but in this case, the steel sections that have been painted with tar-based paint are subject to quality inspection, so the above-mentioned safety regulations apply. This cannot be achieved unless the working environment conditions are determined and there is sufficient atmospheric ventilation on the drying surface.

Therefore, in the present invention, this point has been rationally solved by taking fluid dynamics into consideration, and this is one of the reasons why it has become possible to realize an automatic coating equipment that uses natural drying of shaped steel.

The present invention will be explained below based on an embodiment shown in the drawings.

Figure 1 is an overall explanatory diagram showing an overview of the automatic section steel painting equipment, Figure 2 is an explanatory diagram of the main parts of the shot blasting equipment in Figure 1, and Figure 3 is an explanatory diagram of the main parts of the automatic painting equipment in Figure 1. It is.

In Fig. 1, 1 is a material storage area, 2 is a drying surface plate, 3 is a roller table for transferring the shaped steel that connects the material storage area 1 and the drying surface plate 2, and 4 is a shot installed at a predetermined position on the roller table 3. A blasting device 5 is an automatic coating device disposed on a section steel transfer line close to the shot blasting device 4;
6 is a local exhaust system connected to the coating device 5; 7 is a surface plate 2;
A plurality of suction blowers 18 are arranged on the sides of the surface plate 2, a push blower 19 is arranged on one side of the surface plate 2, a duct with a push blower is arranged at the bottom of the surface plate, and a bug 10 is connected to the shot blast 4. Filter 111 is a unit fan, 12
is the product storage area where the shaped steel is placed after the coating has dried.

In addition, roller table 2 is installed for automatic painting of shaped steel.
A pulse transmitter 13 for length measurement is provided on an appropriate roller, and a phototube 14 for detecting the shaped steel is provided on the side of the transfer line on the entrance side of the shot blasting device 4.

Since the shot blasting device 4 itself has a well-known structure, a detailed explanation will be omitted, but in the case of the present invention, the shot injected during shot blasting is prevented from entering the next automatic coating device 5 along with the shape steel. We have adopted a configuration that

That is, in Fig. 2, 21 is an impeller 2 for spraying shot balls onto the surface of the steel section to be painted.
2 is a shot ball blowing device that blows off shot balls by air injection, and 23 is a shot ball formed by suspending a large number of chains installed on the exit side of the shot blasting device (between the next automatic painting device). A scattering prevention chain 24 is a wire brush for preventing shot balls from scattering, which is provided after the chain 23, and 25 is a roller brush for preventing shot balls from scattering, which is provided after the wire brush 24.

The shot balls sprayed onto the surface of the shaped steel by these chains 23, wire brushes 24, and roller brushes 25 are completely removed before the shaped steel is sent into the automatic painting device 5, and as a result, the shot balls are completely removed from the surface of the shaped steel by the chain 23, wire brush 24, and roller brush 25. The shot blasting device 4 can be placed close to the shot blasting device 4 within 1 m, and the shaped steel can be painted immediately while the shot blasted surface is still in a clean state (that is, while the surface to be painted is not dew condensed and no oxide film is formed). As a result, a stable coating film can be provided.

Further, the next automatic coating device 5 is for automatically and uniformly coating the top and bottom surfaces of the shot-blasted section steel.
It is preferable to use a type equipped with two types of coating nozzles shown in Figure A and Port.

In other words, the one shown in Fig. 3A is a swinging arm type suitable for painting steel sections with a bent cross-section like steel sheet piles.
A downward spray nozzle 32 is attached to the center of an arm 31 that can swing and move up and down, and while swinging the arm 31 and moving the arm 31 itself up and down, paint is sprayed from the nozzle 32 onto the outer surface of the steel section. , the upwardly directed injection nozzle 33 is mounted on a lifting platform 34 so as to be rotatable in a fan shape below the section steel.
The nozzle 33 is rotated while the lifting platform 34 is raised and lowered to paint the inner surface of the shaped steel.

In this way, with the swing arm type, the nozzle is given a combination of lifting and lowering and fan-shaped swinging motions, making the nozzle follow a trajectory along the cross-sectional shape of the steel section, and the nozzle spray angle and spray distance are almost the same at any position. I try not to change.

Furthermore, the opening in Figure 3 is a reciprocating type suitable for painting section steel with a simple cross-sectional shape such as angle iron, and has a pair of opposing arms 35 and 36 that are movable in the direction crossing the transfer line. A set of nozzles 37 and 38 having matching spray angles are arranged to sandwich the section steel transfer line, and the upper and lower surfaces of the section steel are coated by the nozzles 37 and 38.

Therefore, in the automatic coating device 5, either the swing arm type or the reciprocating type may be selected depending on the cross-sectional shape of the steel section to be coated.

Next, since it is necessary to maintain a good working environment on the drying surface plate 2 for the painted shaped steel sections, a plurality of push blowers 8 are placed side by side on the side of the surface plate 2, and A plurality of suction blowers 7 are arranged side by side on the surface plate 2 facing the blower 8.

Further, it is also desirable to arrange the suction blower 7 on other sides of the surface plate 2.

Further, a duct 9 connected to the push-in blower 8' is extended to the lower part of the surface plate 2.

To explain the operation of the coating equipment of the present invention configured as described above, the shaped steel transferred from the material storage area 1 to the roller table 3 first enters the shot blasting device 4 for pre-painting treatment and is shot blasted to clean the surface. be done.

Next, the shot-blasted section is passed through a blow-off device 22.
After the shot balls remaining on the surface are completely removed by the chain 23, wire brush 24, and roller brush 25, the shot balls are immediately sent to the automatic coating device 5, and the injection nozzle (oscillating type or reciprocating type Paint is sprayed and painted automatically depending on the type (type).

In this case, it is necessary to perform operations such as detecting the length, transfer speed, and leading and trailing ends of the shaped steel using the pulse transmitter 13 and phototube 14 to automatically control the start and stop of the shot blasting and painting operations. It is.

Furthermore, the mist generated during painting is collected by a local exhaust system 6 connected to the painting booth, separated as appropriate, and exhausted in a safe manner.

The shaped steel whose upper and lower surfaces have been uniformly coated by the automatic coating device 5 in this manner is then transferred from the roller table 3 onto the drying surface plate 2 and dried.

In this drying surface plate 2, a plurality of push blowers 8°8
', a suction blower 7, and a duct 9 are arranged, so that drying is accelerated and harmful paint mist is sucked, so that the mist does not diffuse outside the surface plate 2.

The mist sucked up by the suction blower 7 is sent outdoors through a duct (not shown).

After drying, the shaped steel is sent to the next product storage area 12 and stored.

In this way, the steel sections are conveyed one after another onto the automatic painting line and are coated completely and uniformly.

As described above, according to the automatic painting equipment of the present invention, the shaped steel is automatically painted continuously, which contributes to improving the efficiency of the painting process and takes into account various considerations that comply with safety regulations. Therefore, it can be said that the facility is fully satisfactory from the aspect of working environment.

[Brief explanation of the drawing]

Figure 1 is an overall layout diagram showing an example of the coating equipment of the present invention, Figure 2
The figure is an explanatory view of the main parts of the shot blasting device, and FIG. 1...Material storage area, 2...Drying surface plate, 3
...Roller table, 4...Shot blasting device, 5...Automatic painting device, 6...
...Local exhaust device, 7...Suction blower-8.
...Pushing blower-110...Bag filter-111...Unit fan, 12...
...Product storage area, 13...Pulse transmitter, 14.
...Phototube, D...Shaped steel.

Claims (1)

[Claims] 1. A shot blasting device that cleans the surface of shaped steel to be painted, a chain for preventing scattering of shot balls formed by suspending a number of chains at the outlet of the device, and a shot ball scattering prevention device installed behind the chain. A wire brush for prevention, a roller brush installed behind the brush to prevent scattering of shot balls, an automatic painting device with an exhaust device that automatically paints the shaped steel immediately after shot blasting, and a duct on the lower side and a roller brush on the upper side. 1. An automatic section steel painting equipment characterized in that a section steel drying surface plate equipped with a force blower and a suction blower facing each other is sequentially arranged in a section transfer line.