JPH0866654A - Powder coating removing device - Google Patents

Abstract

PURPOSE: To completely and efficiently remove a powder coating on a worked part by two-dimensionally and relatively moving a suction nozzle on the surface of a unidirectionally traveled steel sheet to be treated, moving and opening the nozzle in conformity to the shape of the worked part. CONSTITUTION: X-axis and Y-axis scanning mechanisms 11 and 13 and an electrode valve 17 are connected to a nozzle control means 18 to control the mechanisms and valve en bloc. The control means 18 is a computer, for example, and information on the transporting speed and position of a steel sheet 1 to be treated and on the worked part, i.e., fused and welded parts, are inputted. The scanning mechanisms 11 and 13 are traveled by the control means 18 based on the information, a suction nozzle 14 is moved with respect to the steel sheet 1 and opposed to the worked part, the electrode valve 17 is opened, and the paint on the worked part is sucked by the nozzle 14. Consequently, however intricate the shape of the worked part may be the powder coating layer is completely sucked and removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for removing powder coating material, and more particularly, to the above-mentioned processing portion of a steel sheet to which the powder coating material is applied, which is subjected to processing such as fusing or welding in a subsequent step. The present invention relates to a device for removing a coated powder paint layer.

[0002]

2. Description of the Related Art Large structures, especially hulls, are cut out from relatively large steel plates by fusing and processed into
It is constructed by welding and assembling. In addition, during this process, rust may occur on the steel plate and each component.To prevent this, powder coating is applied to the entire steel plate at the stage of the steel plate, and powder coating is performed using this as a protective film. It is being appreciated.

The applicant previously reported a suitable method for such powder coating in Japanese Patent Application No. 5-195380. This is for the entire steel plate that has been subjected to pretreatment such as blasting,
First, the powder coating material is applied thinly to form a powder coating material layer, and the powder coating material layer in a processed portion to be subjected to processing such as fusing and welding in a later step is removed from this steel plate. Further, the powder coating material is applied again to the entire steel sheet so that the thickness of the powder coating material layer other than the processed portion becomes a predetermined thickness, and finally the whole is baked to complete.

According to this method, it is possible to reduce the thickness of the coating film in the processed portion after baking, so that fusing and welding can be performed without any trouble.

[0005]

By the way, as shown in FIG. 7, the steel plate a has a width w that is considerably large, for example, 2350 mm, and it is necessary to plate many parts b of various shapes. Therefore, along a contour line of each component b, that is, a fusing line c (indicated by a solid line) and a welding line d (indicated by a chain line) in the component b ... Powder coating must be removed. This is not easy even considering the size of the steel plate a and the complexity of the shape of the processed portion e.

On the other hand, according to the above report, as a method of removing the powder coating material, a method of suction removal by a vacuum suction device and a suction nozzle (vacuum nozzle) is shown. Specifically, the steel sheet to be treated coated with powder paint is conveyed along the longitudinal direction, and a large number of suction nozzles are provided in the width direction so that these suction nozzles can approach and separate independently. When the processed portion passes, only the suction nozzle at the opposing position is brought close to suck and remove the powder coating material.

As is already known, powder coating is generally based on an electrostatic coating system, which charges the powder of the powder coating negatively and grounds the steel sheet, and utilizes this potential difference. The powder is electrodeposited. Therefore,
The powder paint can be removed by suctioning with a predetermined negative pressure, but with the above-mentioned device, many suction nozzles can be moved close to each other.
Separately driving actuators are required, which complicates the device and increases the cost. Further, the distance from the steel sheet to be treated when approaching must be strictly controlled, which causes a problem that the actuator becomes high-grade.

Further, according to the above report, a removal method using a scraper or the like is also shown, but this method requires resorting to manual work and cannot be said to be a preferable method. It is also shown that a roller or an endless belt to which a positive charge is applied is used instead of the suction nozzle, and these are driven toward and away from each other, but again a large number of actuators are required, and the same problem occurs.

What can be said in common with these is that there is a possibility that the suction removal of the processed portion having a complicated shape cannot be carried out completely and efficiently. That is, it takes time to move the suction nozzle, the roller or the like away from each other, and therefore, in order to completely remove the complicated shape, the steel sheet to be processed must be transported at a low speed. If this happens, the flow of the line will be affected, and as a result, the overall efficiency will deteriorate.

In view of the above circumstances, the present invention has been devised, and an object thereof is to provide a powder coating material removing apparatus capable of completely and highly efficiently removing the powder coating material in the processed portion of the steel sheet to be processed. is there.

[0011]

[Means for Solving the Problems] To achieve the above object, a first aspect of the present invention is to provide a steel plate to be treated to which a powder coating is applied,
In a device for removing the above-mentioned powder coating layer of the processed portion that is subjected to processing such as fusing or welding in a later step,
Conveying means for conveying the steel sheet to be processed at a predetermined speed in one direction, and opening on the surface to be treated of the steel sheet to be treated conveyed by the conveying means at predetermined intervals, and conveying the steel sheet to be treated. Direction and the direction orthogonal thereto, a suction nozzle for sucking and removing the powder coating material layer, and the suction nozzle is moved relative to the steel sheet to be treated and the suction nozzle is opened and closed. Nozzle control means for removing the powder coating layer as the desired processed portion on the surface to be processed is provided.

In order to achieve the above object, a second invention is the above-mentioned coated powder of a processed portion which is subjected to processing such as fusing or welding in a subsequent step from a steel sheet to be processed coated with the powder coating material. In an apparatus for removing a body paint layer, a conveying means that conveys the treated steel sheet in one direction at a predetermined speed, and a treatment surface of the treated steel sheet that is conveyed by the conveying means and is opened at a prescribed interval. And, a plurality of them are provided to cross this, and each is supported to be openable and closable,
A suction nozzle for sucking and removing the powder coating layer, and a nozzle control means for opening and closing an arbitrary number of the suction nozzles to remove the powder coating layer as the desired processed portion on the surface to be processed. It is equipped with and.

[0013]

According to the first aspect of the invention, the suction nozzle is two-dimensionally moved relative to the surface to be processed of the steel sheet to be processed which is conveyed in one direction, and the suction nozzle is moved and opened in accordance with the shape of the processed portion. As a result, the powder coating layer in the processed portion is sucked and removed.

According to the second invention, a plurality of suction nozzles are provided on the surface to be processed of the steel sheet to be processed across the same, and by opening an arbitrary number of them, the shape of the processed portion can be changed. The combined powder coating layer is removed by suction.

According to these inventions, the suction nozzle keeps a constant distance from the surface of the steel sheet to be processed,
In this state, the movement and opening control of the suction nozzle are performed.
Therefore, it is not necessary to move the suction nozzle close to or away from the suction nozzle, and the powder coating material can be efficiently removed.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

1 and 2 are a front view and a side sectional view showing an embodiment of a removing apparatus according to the first invention.

As shown in the figure, for example, a steel plate 1 to be treated for a hull is suspended by a hanger 2 which is a transport means and transported at a constant speed. The steel sheet 1 to be processed has, for example, a length of 11.6 m, a width (effective width) w of 2350 mm, and a thickness t of 1.
It has a relatively large size of 2.0 mm, and a slightly thin hanging part 3 is formed at a predetermined interval on the upper edge in the width direction, and the hook 5 of the hanger 2 is hooked in the hole 4 of the hanging part 3 along the longitudinal direction. Be transported. The hanger 2 is installed on a ceiling portion 6 in a coating line in a factory, that is, it conveys the steel sheet 1 to be treated continuously in a series of coating lines.
Therefore, in the previous stage of the illustrated example, the steel sheet to be treated 1 is being subjected to the first powder coating while being conveyed, and after the removal of the processed portion is performed in the illustrated stage, the final second final coating is performed in the latter stage. Powder coating is performed. In this way, such a device is constructed so as not to stop the flow of the line and is capable of completely automatically removing the powder coating material. Further, the powder coating material is applied to both sides of the steel sheet 1 to be treated, so that the removal is performed on both sides. The transport speed of the steel plate 1 to be treated is about 3 m / min.

On the ceiling portion 6, a pair of mounts 7 are provided in the middle so as to sandwich the hanger 2 and extend in parallel with it.
An upper guide member 8 is provided on the lower surface of these mounts 7,
Similarly, on the floor portion 9, a lower guide member 10 is provided just below the upper guide member 8. These guide members 8 and 10 are vertically suspended by an X-axis scanning mechanism 11 (the transport direction is the X-axis), that is, the X-axis scanning mechanism 11
Is vertically spaced apart from both sides of the steel plate 1 to be processed and is guided by the guide members 8 and 10 so that the steel plate 1 to be processed 1
It is reciprocally movable along the longitudinal direction. Further, in the case of the present embodiment, the X-axis scanning mechanism 11 is provided in two stages in the transport direction of the steel sheet 1 to be processed.

Each X-axis scanning mechanism 11, that is, the front-stage X-axis scanning mechanism 11 is provided with a vertical guide member 12 on its front side and the rear-stage X-axis scanning mechanism 11 is provided on its rear side. Further, each X-axis scanning mechanism 11 is provided with a Y-axis scanning mechanism 13 (the Y-axis is orthogonal to the carrying direction) which is guided by the vertical guide member 12 and is capable of reciprocating over the entire width of the steel sheet 1 to be processed. It is provided. These X-axis and Y-axis scanning mechanisms 11 and 13 have a built-in normal driving means such as a servomotor, and the scanning means 11 and 13 are driven by this driving means.
13 is designed to be substantially moved.

Each Y-axis scanning mechanism 13 is provided with a suction nozzle 14 facing the surface to be processed of the steel plate 1 to be processed facing the Y-axis scanning mechanism 13 at a predetermined interval h.
The suction nozzle 14 has its suction port (indicated by 14a in FIG. 5).
The diameter of is relatively small, for example, about 4 mm, and
It is connected to a vacuum generator 16 via a suction passage 15 such as a flexible hose. In this way, the suction negative pressure of, for example, about -200 to -300 mmHg created by the vacuum generator 16 is sent to the suction nozzle 14, which sucks the powder coating layer applied to the treated surface of the steel sheet 1 to be treated. And then remove it.
Further, an electromagnetic valve 17 is connected to the suction nozzle 14 and is opened / closed to perform suction / stop.

The steel sheet 1 to be processed is conveyed at a constant speed, and the processed portions thereof approach the suction nozzle 14 one after another. When passing through this, the powder coating layer in the processed portion of the steel sheet 1 to be processed is sequentially formed. Aspirated and removed. That is, the X-axis and Y-axis scanning mechanisms 11 and 13 and the solenoid valve 17 are connected to the nozzle control means 18 that collectively controls them. The nozzle control means 18 is, for example, a computer,
Information such as the conveyance speed and position of the steel sheet 1 to be processed, and the processed portion, that is, the fusing / welding portion, is input to this. Then, based on these pieces of information, the nozzle control means 18 causes the X-axis and Y-axis scanning mechanisms 11 and 13 to move and move, and the suction nozzle 14 to move relative to the steel plate 1 to be processed and to be positioned at the facing position of the processed portion. The electromagnetic valve 17 is opened to allow the suction nozzle 14 to perform suction. In simple terms,
Basically, the Y-axis scanning mechanism 13 in the preceding stage is moved in the width direction to move or position the suction nozzle 14 to the facing position of the processing portion, and further, the solenoid valve 17 is opened for a predetermined time or momentarily, and the suction nozzle is opened. Suction is performed by 14. Since the steel plate 1 to be processed is constantly moving and the shape of the processed portion is complicated, it is actually not enough to move the suction nozzle 14 in the preceding stage in the width direction. Therefore, in addition to the movement in the longitudinal direction by the X-axis scanning mechanism 11, the two-dimensional operation of the suction nozzle 14 in the preceding stage is performed. And if you still can't make it,
The suction work is shared by the movement of the X-axis and Y-axis scanning mechanisms 11 and 13 in the subsequent stage. Also, the X-axis and Y-axis scanning mechanism 11,
It is also possible to carry out suction continuously while moving 13, and to suck and remove a desired shape along the processed portion in a single stroke. Therefore, in this way, no matter how complicated the processed portions on both sides of the steel sheet 1 to be treated are, it is possible to completely remove the powder coating layer applied thereto by suction. Since this can be performed while the conveyance speed of the steel sheet 1 to be processed is kept constant, highly efficient suction removal is possible.

Further, in order to maintain the removal area during suction at a predetermined value, the distance h between the suction nozzle 14 and the steel plate 1 to be treated is
However, this device has been devised to do this. That is, the floor plate 9 has
A holding portion 19 for holding the lower end edge of the holding portion 19
Is provided. In the illustrated example, the lower end edge of the steel plate 1 to be treated is made slightly thin, and the holding portion 19 is composed of a pair of blocks 20 that movably clamp the lower end edge. The holding portions 19 are provided in front of and behind the lower guide member 10, respectively, so that the vibrations associated with the conveyance and suction of the steel sheet 1 to be treated are suppressed or regulated.

Further, the Y-axis scanning mechanism 13 is provided with interval adjusting means (not shown) for adjusting the interval h by moving itself or the suction nozzle 14 toward and away from the steel plate 1 to be processed. This is built in the Y-axis scanning mechanism 13, and a driving means such as a servo motor for moving the nozzle 14 itself toward or away from the Y-axis scanning mechanism 13 and a non-contact or gap sensor for detecting the nozzle position with respect to the steel plate 1 to be processed. And means. These drive and detection means are connected to the nozzle control means 18, and thus the nozzle control means 1
Reference numeral 8 is adapted to drive the driving means based on the signal from the detecting means to optimally adjust the nozzle position. As a result, for example, even when the steel plate 1 to be processed has undulations,
The gap h between the suction nozzle 14 and the steel plate 1 to be treated can be optimally maintained. Further, it becomes possible to easily and promptly deal with the change of the plate thickness of the steel plate 1 to be processed. Furthermore, since the suction nozzle 14 does not contact the steel plate 1 to be treated,
A certain quality can be secured by preventing scratches on the coated surface before baking.

Another advantage of this embodiment is that the suction nozzle 14 has a small diameter so that the removed portion has a fine area and a line with a fine width can be drawn.

Although the lower end edge of the steel plate 1 to be treated is made slightly thinner in this embodiment, it may be made the same thickness as the effective width portion. It is also possible to configure the distance adjusting means by other mechanical means. Various driving methods for the X-axis and Y-axis scanning mechanisms 11 and 13 are conceivable. For example, a belt mechanism or a gear mechanism can be used, and the suction nozzle 14 can be operated by a parallel link mechanism or an articulated robot. Is also possible. Furthermore, if the number of suction nozzles 14 is further increased, the tact time can be further improved.

Next, an embodiment of the removing device according to the second invention will be shown.

As shown in FIGS. 3 and 4, in this embodiment, support frames 21 standing upright from the floor 9 are provided on both sides of the steel plate 1 to be treated, and the support frames 21 are further provided. A suction unit 22 is provided. The support frame 21 has a plate portion 21a that is projected toward the end.
Also, the support frame 21 is stably fixed to the floor 9 by this. The height dimension of the support frame 21 is set higher than that of the steel plate 1 to be processed, and the suction unit 22 is provided across the width of the steel plate 1 to be processed on the support frame 21.

The suction unit 22 is provided on the front side of the support frame 21 in the carrying direction, and a large number of suction nozzles 14 are densely provided on it. These suction nozzles 14 are provided with their suction ports facing the surface to be processed facing each other and at a predetermined interval h, and their tip ends are exposed or projected from the casing 23 of the suction unit 22. The suction nozzle 14, as shown in FIG.
There are four rows counting from the front in the transport direction, and they are arranged in a zigzag pattern without gaps. Strictly speaking, although the second and third rows are not a perfect staggered arrangement, they are completely adjacent to each other and can be said to be a staggered arrangement as a whole. Then, these suction nozzles 14 are connected to the vacuum generator 16 via the suction passage 15 such as a flexible hose as described above. Further, each suction nozzle 14 has a solenoid valve (not shown).
Are connected, and these solenoid valves are controlled to be opened / closed by the similar nozzle control means 18. Similarly, the diameter of the suction nozzle 14 is as small as about 4 mm, so that the suction unit 22 has an infinite number of suction nozzles 14.

A holding portion 19 for supporting the steel plate 1 to be treated is also provided in the same manner. In the case of this embodiment, the holding portion 19 is a block 24 fixed to the floor portion 9 and rotatable on the block 24. And a roller 25 supported by. The rollers 25 sandwich the lower end edges of the steel sheet 1 to be processed, and rotate in accordance with the conveyance of the steel sheet 1 to be processed.
By doing so, it is apparent that the frictional resistance is reduced as compared with the above case and the steel sheet 1 to be processed can be conveyed smoothly.

The suction removal in the case of this embodiment is as shown in FIG.
It becomes a complete dot system as shown in. That is, in the case of the above-described embodiment, continuous removal such as one-stroke writing is possible by two-dimensional operation of the suction nozzle 14, but in the case of the present embodiment,
Only the arbitrary number of suction nozzles 14 at the facing position of the processed portion e, that is, at the corresponding height position are selectively opened for a predetermined time or moment to draw a desired shape along the processed portion in a dot shape. Is. Then, as the steel sheet 1 to be processed is conveyed, the suction nozzles 14 that perform suction work are also switched one after another. Then, since the suction work is assigned to all the four rows of suction nozzles 14, there is no fear of delay. In this way, the powder coating layer in the processed portion of the steel sheet 1 to be processed is completely removed.

In addition to the above, various modified embodiments are conceivable, and the present invention is not limited to the above embodiments.

[0033]

The present invention exhibits the following excellent effects.

(1) The powder coating material on the processed portion of the steel sheet to be processed can be completely and efficiently removed regardless of the shape of the processed portion.

(2) It is not necessary to reduce the conveying speed of the steel sheet to be treated, and the line flow is not disturbed.

(3) Complete automation is possible.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a removing device according to the first invention.

FIG. 2 shows an embodiment of a removing device according to the first invention,
It is the sectional view on the AA line side of FIG.

FIG. 3 is a front view showing an embodiment of a removing device according to the second invention.

FIG. 4 shows an embodiment of a removing device according to the second invention,
It is a BB line side sectional view of FIG.

FIG. 5 is an enlarged front view showing the arrangement of suction nozzles.

6A and 6B are diagrams showing a state of powder coating material removal, wherein FIG. 6A shows a linear shape, FIG. 6B shows a circular shape, and FIG. 6C shows an elliptical shape.

FIG. 7 is a front view showing a steel plate to be processed and a processed portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel plate to be treated 2 Conveying means 14 Suction nozzle 18 Nozzle control means e Processing part

Front Page Continuation (72) Inventor Torao Tadashi, 3-15-15 Toyosu, Koto-ku, Tokyo Ishikawajima Harima Heavy Industries, Ltd. Toni Technical Center (72) Inventor Hideo Kasougabe Sanyo Toyosu, Koto-ku, Tokyo 1-15 Ishikawajima Harima Heavy Industries Co., Ltd. Toji Technical Center

Claims (2)

[Claims] 1. A steel plate to be treated coated with powder coating,
In a device for removing the above-mentioned powder coating layer of the processed portion that is subjected to processing such as fusing or welding in a later step,
Conveying means for conveying the steel sheet to be treated at a predetermined speed in one direction, and a conveyance means for conveying the steel sheet to be treated, which is opened at a predetermined interval on the treated surface of the steel sheet to be treated conveyed by the conveying means. Direction and its orthogonal direction, the suction nozzle for sucking and removing the powder coating material layer, and the suction nozzle is moved relative to the steel sheet to be treated and the suction nozzle is opened and closed. A powder coating material removing apparatus comprising: a nozzle control unit for removing the powder coating material layer as a desired processed portion on a surface to be processed. 2. A processed steel sheet coated with powder coating,
In a device for removing the above-mentioned powder coating layer of the processed portion that is subjected to processing such as fusing or welding in a later step,
A transport means for transporting the steel sheet to be treated in one direction at a predetermined speed, and a plurality of openings opened at a predetermined interval on the surface to be treated of the steel sheet to be treated which is transported by the transport means, and a plurality of which are to traverse this. A suction nozzle for suctioning and removing the powder coating layer and a suction nozzle for suction-removing the powder coating layer and a desired number of the processing portions on the surface to be processed by opening and closing the suction nozzles. A powder paint removing device comprising: a nozzle control unit for removing the powder paint layer.