CN100509177C - Powder paint coating system and powder paint coating method - Google Patents

Abstract

The present invention provides a powder paint coating system and a powder paint coating method, which can improve the efficiency of peeling off the excess paint film formed on the surface of the suspension member for suspending the object to be processed, and improve the efficiency of the coating production line. It can reduce the cost of peeling off the excess coating film formed on the suspension parts while increasing the operating rate and improving the productivity. Among them, the processed object W is suspended on a hanger (14). Then, the powder coating is applied by spraying the powder coating on the object W suspended on the hanger (14) by the coating coating device (20). After that, air is blown by the air blowing device (40) to the hanger (14) on which the object W coated with the powder coating is suspended.

Description

Powder coating system and powder coating method

technical field

The present invention relates to a powder paint coating system and a powder paint coating method for applying powder paint to an object to be processed, in particular, it is possible to efficiently apply a suspension formed on a suspended object to be processed. A powder coating system and a powder coating method for peeling off excess coating film on the surface of a part.

Background technique

Parts that require design such as hall doors, three-square frames, side panels, and ceilings in elevators are usually called design products, and such design products are finished by painting. Specifically, as an example of coating these to-be-processed objects, a powder paint coating method of applying powder paint to the to-be-processed objects is used.

An example of such a powder coating method will be specifically described with reference to FIG. 7 . Fig. 7 is a schematic explanatory diagram showing a powder coating material application process. As shown in step 1 of FIG. 7 , firstly, the processed objects to be coated with powder coatings are hoisted sequentially at certain intervals by using the hanger, and the hanger is transported circularly by the endless conveyor belt. Here, as the hanger for suspending the object to be processed, the hanger shown in Utility Model Registration No. 3006283 etc. is used, for example. When the hanger on which the object to be processed is suspended circulates, first, as shown in step 2 of FIG. 7 , the object to be processed is pretreated. Specifically, degreasing and forming a zinc phosphate coating are performed on the object to be treated, thereby preventing the object from rusting and making it easy for the powder paint to adhere to the surface. Next, as shown in step 3 of FIG. 7 , dehydration drying of the object to be processed is performed. Thereafter, as shown in step 4, the powder coating is sprayed on the object to be treated to apply the powder coating. The specific content of this step will be described later. Next, as shown in step 5, the object to be treated coated with the powder paint is baked and dried to form a coating film. Finally, as shown in step 6, the object to be treated with the coating film formed is lowered from the hanger. This hanger is reused in the next process to hang a new object to be treated that needs to be coated with powder coating.

Next, the coating process shown in Step 4 of FIG. 7 will be specifically described using FIGS. 8 to 10 . Fig. 8 is a plan view showing the structure of a conventional powder paint coating system, Fig. 9 is a side view of the powder paint coating system of Fig. A side view for schematic explanation of the electrostatic coating performed by the paint coating device of the body paint coating system.

As shown in Figure 8 and Figure 9, the conventional powder paint coating system has a guide rail 10, a suspension jig 12 arranged below the guide rail 10 and guided along the guide rail 10, installed on the suspension A pair of left and right hangers 16 are used to suspend the object W to be processed by using the lower part of the jig 12 . Here, the guide rail 10 is provided along a circular circulation path so that the assembly of the suspension jig 12 and the pair of hangers 16 is guided along the circulation path along the guide rail 10 . Also, as shown in FIG. 8 , a pair of hangers 16 suspends the substantially rectangular processed object W so that the short direction of the processed object W coincides with the extending direction of the guide rail 10 (vertical direction in FIG. 8 ).

In addition, the conventional powder paint application system has a pair of paint application devices 20 on both sides of the guide rail 10 . Each paint application device 20 has a base 22 installed on the ground, a support 24 mounted on the upper surface of the base 22, and a paint coating installed in a vertically movable manner relative to the support 24 (vertical direction). A spray gun (gun) holding member 26 and, for example, three paint spray guns 28 are attached so as to line up with the paint spray gun holding member 26 in the vertical direction. The paint spray gun 28 sprays the powder paint stored inside. One such paint application device 20 is provided on each side of the guide rail 10 , so that powder paint can be applied to both surfaces of the object W suspended by the hanger 16 .

A more specific configuration of the paint application device 20 will be described using FIG. 10 . As shown in FIG. 10 , the paint application device 20 applies powder paint to the object W to be processed by electrostatic painting. Specifically, a high voltage generating device 30 is electrically connected to each coating spray gun 28 , and the high voltage generating device 30 negatively charges the coating spray gun 28 . On the other hand, the guide rail 10 , the suspension jig 12 , and the hanger 16 are each formed of a conductive member (specifically, iron, for example), and the guide rail 10 is grounded. Therefore, the object W suspended by the hanger 16 is positively charged. Accordingly, an electric field is generated between the coating spray gun 28 and the object W to be processed (see the dotted line in FIG. 10 ).

When the powder paint is sprayed from the painting gun 28, the powder paint is negatively charged. Then, the sprayed powder paint moves in the air along the lines of force in the electric field so as to approach the positively charged object W to be processed (that is, moves along the dotted line in FIG. 10 ). In this way, uniform powder coating is performed on the object W to be processed. In addition, at this time, the powder coating material spreads to the side of the object W to be processed, and the coating on the side can also be performed. In this way, electrostatic coating can spray powder coating without omission at a coating rate higher than that of normal coating, and can improve coating quality and reduce the cost of powder coating.

However, the above-mentioned conventional powder coating method has the following problems.

That is, when utilizing the paint application device 20 shown in FIGS. The body paint is sprayed on the object W without omission, but at this time, the coating spray gun 28 must be moved to a position above the upper end of the object W to spray the powder paint. The reason for this is to prevent poor coating of the upper region of the object W to be processed. However, at this time, the hanger 16 is also coated with powder paint. If the baking and drying process shown in step 5 of FIG. 7 is directly performed, the powder paint adhering to the hanger 16 will be melted and fixed. Here, since the hanger 16 is repeatedly used several times as described above, the coating film formed on the surface of the hanger 16 will thicken several layers each time the number of uses increases, and the conductivity of the hanger 16 will be accompanied by this. Decrease, decrease in electrostatic force, and deterioration of coating efficiency. Therefore, in order to maintain good conductivity of the hanger 16, the hanger 16 having a coating film formed on its surface after being used several times must be peeled off by a bead blast device or the like. In addition, due to the operation using such a spraying device, the number of hangers 16 used in the painting line is insufficient, and there is a possibility that the processing in the painting line may be interrupted.

Fig. 11(a) is a view showing the state of the hanger 16 before use in the conventional powder coating system, and Fig. 11(b) is a view showing the hanger 16 after repeated use in the conventional powder coating system state diagram. A portion 16 a shown in the blank in FIG. 11( b ) represents a coating film formed on the surface of the hanger 16 . As shown in FIG. 11( b ), the coating film thickness of the trunk portion indicated by the arrow C of the hanger 16 becomes extremely thick. On the other hand, since the hook portion indicated by the arrow D of the hanger 16 is mostly covered by the object W to be treated, the coating film is not thicker than the body portion indicated by the arrow C described above. In order to ensure the electrical conductivity of the hanger 16, it is necessary not to accumulate the coating film at least on the hook portion indicated by the arrow D, but in the state where the coating film is accumulated on the trunk portion indicated by the arrow C, the conductivity of the hanger 16 will not function properly. Problems will happen. Therefore, as a result, the coating film of the entire hanger 16 must be peeled off.

In addition, the powder paint that is not applied to the object W can be reused by recycling, but the powder paint applied to the hanger 16 cannot be recycled, and there is a problem that the powder paint is used too much and the painting cost increases. The problem.

Contents of the invention

The present invention has been made in consideration of the above-mentioned problems, and its object is to provide a powder coating system and a powder coating method capable of improving the excess coating film formed on the surface of a suspension member for suspending the object to be processed. Efficiency of peeling treatment, improvement of operation rate of coating production line and productivity, reduction of cost for peeling treatment of excess coating film formed on suspension parts. According to the present invention, the recovery efficiency for recycling of powder paint can be improved.

The present invention is a powder coating system for coating a powder coating on an object to be treated, which is characterized in that it has: a suspension member for suspending the object to be treated; A paint coating device that sprays a powder coating on an object to be treated on a component to apply the powder coating, and a suspension that suspends the object to be treated that is coated with a powder coating by the paint coating device Blowing device for blowing air from parts.

In addition, the present invention is a powder coating method for coating a powder coating on an object to be treated, and is characterized in that it includes the following steps: a step of suspending the object to be treated on a suspension member; The process of spraying the powder coating on the object suspended on the above-mentioned suspension member to apply the powder paint, blowing the above-mentioned suspension member on which the object to be processed coated with the powder paint is suspended. gas process.

According to this powder paint coating system and powder paint coating method, for the excess powder paint that also adheres to the suspension parts when the powder paint is sprayed on the object to be treated, the suspension parts are sprayed by blowing the suspension parts. air, it can be peeled off from the suspension part. Therefore, in the process of baking and drying the object to be treated in the subsequent process, when forming a coating film on the object to be processed, an unnecessary coating film will not be formed on the suspension member, or an excessive coating film will not be formed on the suspension member. The amount of excess coating film becomes very small. Thereby, can improve the stripping processing efficiency of the redundant coating film that is formed on the surface of this suspension with parts, improve the operating rate of coating production line and improve productivity, can reduce the cost of the redundant coating film that is formed on the suspension with parts at the same time. The cost of the stripping process. Furthermore, the recovery efficiency for recycling of the powder paint can be improved.

In the powder paint application system of the present invention, it is preferable that the paint application device applies the powder paint to the object to be treated by electrostatic painting. Accordingly, the powder paint can be applied to the portion of the object to be processed that does not directly face the paint application device, and the powder paint can be applied to the object to be processed without omission.

In the powder coating coating system of the present invention, the above-mentioned hanging member is composed of a lower half that is directly fastened on the above-mentioned object to be processed, and a lower half that is arranged above the lower half and can be freely attached to and detachable from the lower half. The upper half is configured, and the air blowing device preferably blows air to the upper half of the suspension member. Accordingly, when the air blowing device blows the suspension member, the object to be processed can be uniformly coated without peeling off the powder coating material applied near the upper end of the object to be processed. In addition, in this case, in the baking and drying process of the subsequent process, the powder paint attached to the lower half of the suspension member is melted to form a coating film on the surface of the lower half, so after several times After the painting cycle, the bottom half is separated from the top half and only the bottom half is sprayed. If only the lower half is sprayed, since the area to be sprayed becomes smaller, compared with the case of spraying the entire suspension part, several times the number of sprays can be performed at one time. deal with.

In the powder paint application system of the present invention, in the suspension member, the lower half and the upper half are preferably joined together by a screw structure. Accordingly, the lower half can be easily attached to and detached from the upper half, and the lower half can be easily replaced.

In the powder paint application system of the present invention, it is preferable that the suspension member further has a cap portion covering the screw structure. Thereby, it is possible to prevent the powder coating from being applied to the thread structure when spraying the powder coating. Therefore, it is possible to prevent problems that a coating film is formed on the thread structure and separation of the lower half and the upper half becomes difficult.

According to the powder paint coating system and powder paint coating method of the present invention, it is possible to improve the peeling treatment efficiency of the excess coating film formed on the surface of the suspension member for suspending the object to be processed, and to improve the efficiency of the coating production line. The operation rate can be improved and the productivity can be improved, and the cost of peeling off the excess coating film formed on the suspension parts can be reduced at the same time. Furthermore, it is also possible to improve the recovery efficiency for the recycling of the powder paint.

Description of drawings

FIG. 1 is an overall perspective view illustrating an outline of the overall configuration of a general powder paint application system.

Fig. 2 is a plan view showing the configuration of a powder paint coating system according to one embodiment of the present invention.

Fig. 3 is a side view of the powder coating coating system of Fig. 2 viewed from the line A-A.

Fig. 4 is a front view showing the details of the structure of the hanger of the powder paint coating system of Fig. 2 .

Fig. 5 is a partial perspective view showing the configuration of the hanger in Fig. 4 .

Fig. 6 is a side view showing details of the configuration of an air blowing device of the powder paint coating system shown in Fig. 2 .

FIG. 7 is an explanatory diagram showing a schematic of a powder coating material application process.

Fig. 8 is a plan view showing the configuration of a conventional powder paint application system.

Fig. 9 is a side view of the powder coating coating system of Fig. 8 viewed from the B-B direction.

FIG. 10 is an explanatory side view showing an outline of electrostatic coating performed by the paint coating device of the powder paint coating system shown in FIG. 8 .

Fig. 11(a) is a diagram showing the state of the hanger before use in the conventional powder coating system, and Fig. 11(b) is a diagram showing the state of the hanger after repeated use in the conventional powder coating system .

Detailed ways

Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 are diagrams showing one embodiment of the powder paint application system of the present invention.

1 is an overall perspective view for explaining the outline of the overall configuration of a general powder coating coating system, FIG. 2 is a plan view showing the configuration of a powder coating coating system according to an embodiment of the present invention, and FIG. A-A side view of the powder coating application system. In addition, FIG. 4 is a front view showing the details of the structure of the hanger of the powder paint coating system in FIG. 2 , and FIG. 5 is a partial perspective view showing the partial structure of the hanger in FIG. 4 . Fig. 6 is a side view showing details of the configuration of an air blowing device of the powder paint coating system shown in Fig. 2 .

Referring to FIGS. 1 to 6 , the same components as those in the conventional powder paint application system shown in FIGS. 7 to 10 will be described with the same reference numerals.

As shown in FIGS. 1 to 3 , the powder paint coating system according to this embodiment has a guide rail 10 arranged along a circular circulation path (refer to the two-dotted line in FIG. 1 ), and is provided below the guide rail 10 . A suspension jig 12 guided along the guide rail 10 and a pair of left and right hangers 14 for suspending the object W to be processed are attached to the lower portion of the suspension jig 12 . Here, the assembly of the suspension jig 12 and the pair of hangers 14 is guided along the guide rail 10 along a circulation path. Also, as shown in FIG. 1 , the pair of hangers 14 suspends the substantially rectangular plate-shaped processed object W so that the short direction of the processed object W coincides with the extending direction of the guide rail 10 . Details of the structure of the hanger 14 will be described later.

In addition, the powder paint coating system has a pair of paint coating devices 20 on both sides of the guide rail 10 as shown in FIG. 2 . Each paint application device 20 has a base 22 installed on the ground, a support 24 mounted on the upper surface of the base 22, a paint spray gun holding member 26 provided to move freely in the vertical direction relative to the support 24, And, for example, three paint spray guns 28 are attached so as to line up with the paint spray gun holding member 26 in the vertical direction (vertical direction). The paint spray gun 28 sprays the powder paint stored inside. In addition, each painting gun 28 can spray powder paint on the entire surface of the object W to be processed by moving the painting gun holding member 26 in the vertical direction relative to the support 24 .

Since one paint application device 20 is provided on each side of the guide rail 10 , powder paint can be applied to both surfaces of the object W suspended on the hanger 14 . As shown in FIG. 10 , the paint application device 20 applies powder paint to the object W to be processed by electrostatic coating, but since the details of this electrostatic coating have already been described, the description thereof will be omitted.

Furthermore, on the downstream side of the pair of paint application devices 20 in the circulation path formed by the guide rail 10 , an air blowing device 40 is mounted on the guide rail 10 by means of a connecting member 42 . The air blowing device 40 blows air toward the hanger 14 on which the object W is suspended, as shown in FIGS. 2 , 3 , and 6 .

Hereinafter, each component of such a powder paint application system, especially the hanger 14 and the blowing device 40 will be described in detail.

As shown in FIGS. 4 and 5 , the hanger 14 has an upper half 14 a detachably attached to the suspension jig 12 and a hook-shaped lower half 14 b directly engaged with the object W to be processed. A lower end of the upper half 14a is attached with a cover portion 14c in the shape of a hollow triangular pyramid with an open bottom. On the other hand, the upper end (the end on the opposite side to the hook forming end) of the lower half 14b is provided with a male screw portion 14d. Here, the structure is as follows: On the inner side of the cover part 14c, a female screw hole in which the male screw part 14d can be inserted and engaged is formed, and the male screw part 14d can be connected to the female screw hole by engaging the male screw part 14d in the female screw hole of the cover part 14c. Half 14a and lower half 14b. In addition, when the male screw portion 14d is snap-fitted into the female screw hole of the cover portion 14c, as shown in FIG. 5, the male screw portion 14d is covered by the cover portion 14c.

As shown in FIGS. 3 and 6 , the air blowing device 40 blows air in the horizontal direction, and the position of the air blowing device 40 in the height direction is set at a height at which air is blown onto the hanger 14 . The air blowing device 40 is suspended from above by a connecting member 42 .

More specifically, the position in the height direction of the air blowing device 40 is set so that the gas is mainly blown on the upper half 14 a of the hanger 14 . Thus, the air blowing device 40 blows off the powder coating applied to the upper half 14 a of the hanger 14 .

Hereinafter, the operation of the powder paint coating system having such a configuration will be described.

First, the overall outline of the powder paint coating method will be described with reference to FIGS. 1 and 7 . First, the objects W to be treated to which the powder coating is to be adhered are sequentially hoisted by the hanger 14 at regular intervals, and the hanger 14 is moved along the guide rail 10 . Then, when the hanger 14 on which the object to be processed W is suspended is moved circularly, the object to be processed W is pretreated first. Specifically, by degreasing and forming a zinc phosphate coating on the object W to be treated, rusting of the object W is prevented, and powder paint is easily attached. Next, the hanger 14 on which the object to be processed W is suspended is further moved, and the object to be processed W is dehydrated and dried by a drying device (not shown). Afterwards, the hanger 14 that is suspended with the processed object W is moved to the paint application device 20, and the powder paint is sprayed to the processed object W by each coating spray gun 28 of the paint application device 20, so that the processed object W W is coated with powder coating. At this time, since one paint application device 20 is provided on each side of the guide rail 10 , a total of two, the powder paint can be applied to both surfaces of the object W to be processed. In addition, since the paint application device 20 applies the powder paint to the object W to be processed by electrostatic coating, the powder paint can also adhere to the side of the object W to be processed.

In addition, when the powder paint is sprayed onto the object W by the paint spray guns 28 of the paint application device 20 , a part of the powder paint adheres to the hanger 14 above the object W as well. But, because the screw structure part that connects upper half 14a and lower half 14b in the hanger 14 (specifically, the male screw part 14d that is arranged on the upper end of the lower half 14b and the female screw hole that is formed on the cover part 14c) are Since the cap portion 14c having a hollow conical shape is covered, the powder paint does not adhere to the screw structure portion.

Next, as shown in FIG. 2 , the hanger 14 on which the object W is suspended is further moved downstream, and the hanger 14 is made to face the air blowing device 40 as shown in FIG. 3 . At this time, as shown in FIG. 6 , the height of the hanger 14 is that its upper half 14 a faces the opening of the air blowing device 40 . Then, the air blowing device 40 blows air to the hanger 14 in a state where the hanger 14 faces the air blowing device 40 . As a result, the powder coating applied to the upper half 14a of the hanger 14 is peeled off.

Here, if the blowing device 40 blows the entire hanger 14 (i.e., both the upper half 14a and the lower half 14b), due to the blowing to the hook-shaped lower half 14b, the coated The powder coating near the upper end of the object W may be peeled off, and in this case, the object W cannot be uniformly coated.

The hanger 14 from which the powder coating of the upper half 14a has been peeled off by the air blowing device 40 is then transported further downstream along the guide rail 10, and the object W to be processed is dried in a baking and drying oven (not shown). Bake and dry. As a result, the powder paint adhering to the object W is melted by the high-temperature hot air, and a coating film is formed on the surface of the object W.

At this time, the powder paint adhering to the hook-shaped lower half 14b of the hanger 14 is also melted to form a coating film on the surface of the lower half 14b. Therefore, after several such painting cycles, the lower half 14b is separated from the upper half 14a, and the lower half 14b is replaced. Then, only the lower half portion 14b on which the coating film is laminated is sprayed by a bead spraying device. If only the hook-shaped lower half 14b is sprayed in this way, the area to be sprayed is reduced, so compared with when the entire hanger 14 is sprayed, several times the number of sprays can be performed at one time. spray treatment.

As described above, according to the powder paint application system and the powder paint application method of the present embodiment, by suspending the object W to be processed on the hanger 14, the object to be processed W suspended on the hanger 14 is The object W is sprayed with a powder coating to apply the powder coating, and then air is blown to the hanger 14 on which the object W coated with the powder coating is suspended. Therefore, the excess powder paint adhering to the hanger 14 when the powder paint is sprayed on the object W to be processed can be peeled off from the hanger 14 by blowing air on the hanger 14 . Therefore, in the baking and drying treatment of the object W to be processed in the subsequent process, when the coating film is formed on the object W to be processed, an unnecessary coating film will not be formed on the hanger 14, or an excessive coating film formed on the hanger 14 will not be formed. The amount of excess coating film becomes very small. Thereby, can improve the stripping processing efficiency of the excess coating film formed on the surface of this hanger 14, improve the operating rate of the coating production line and improve productivity, can reduce the stripping treatment of the excess coating film formed on the hanger 14 at the same time the cost spent. Furthermore, the recovery efficiency for recycling of the powder coating material can also be improved.

In addition, since the paint application device 20 applies the powder paint to the object W to be processed by electrostatic coating, it is also possible to apply the powder paint to the part of the object W not directly facing the paint application device 20. For coating, powder coating can be applied to the object W to be processed without omission.

In addition, the hanger 14 is composed of a lower half 14b that is directly fastened on the object W to be processed, and an upper half 14a that is arranged above the lower half 14b and can be freely attached to and detached from the lower half 14b. The upper half 14a in the hanger 14 is blown. Therefore, when the hanger 14 is blown by the air blowing device 40, the powder coating applied near the upper end of the object W is not peeled off, and the object W can be uniformly coated. In addition, at this time, in the baking and drying process of the subsequent process, since the powder coating material attached to the lower half 14b of the hanger 14 is melted, a coating film is formed on the surface of the lower half 14b, so several times are carried out. After the painting cycle, the lower half 14b may be separated from the upper half 14a, and only the lower half 14b may be sprayed. In the case of spraying only the lower half 14b, since the area to be sprayed is reduced, compared with spraying the entire hanger 14, several times the number of sprays can be performed at one time. deal with.

In addition, the lower half 14b of the hanger 14 is combined with the upper half 14a by a screw structure (specifically, a male threaded portion 14d provided on the upper end of the lower half 14b and a female threaded hole formed on the cover portion 14c). Therefore, the lower half 14b can be easily attached to and detached from the upper half 14a, and the lower half 14b can be easily replaced.

In addition, since the hanger 14 also has the cover portion 14c covering the screw structure, it is possible to prevent the powder paint from being applied to the screw structure when the powder paint is sprayed. Thus, it is possible to prevent the occurrence of a problem that a coating film is formed on the thread structure and separation of the lower half 14b and the upper half 14a becomes difficult.

In addition, the powder paint application system and the powder paint application method of this embodiment are not limited to the above-mentioned form, Various changes are possible. For example, although the case where the hanger 14 is used as the suspension member for suspending the object W to be processed has been described, as long as it is a member capable of suspending the object W to be processed, other members may be used as the suspension member. . In addition, the paint application device for attaching the powder paint to the object W to be processed is not limited to the type that performs electrostatic painting, and other types may be used.

Claims (6)

1. powder coating application system that is used for object being treated coating powder coating, it is characterized in that it has: the suspention that is used to suspend in midair object being treated is with parts, by having applied the blowning installation that the described suspention of the object being treated of powder coating is blown with parts to being applied the varnish coating device of this powder coating by described suspention with the object being treated spraying powder coating of parts suspention and suspention being had by described varnish coating device.

2. the described powder coating application system of claim 1 is characterized in that described varnish coating device applies powder coating by electrostatic spraying to object being treated.

3. the described powder coating application system of claim 1, it is characterized in that, described suspention with parts by directly being fastened on the latter half on the described object being treated and being arranged on the top of described the latter half and the first half of freely loading and unloading on this latter half constitutes; Described blowning installation is blown with the first half in the parts to described suspention.

4. the described powder coating application system of claim 3 is characterized in that, with in the parts, the latter half and the first half combine by helicitic texture in described suspention.

5. the described powder coating application system of claim 4 is characterized in that, described suspention also further has the cover that covers described helicitic texture with parts.

6. powder coating coating method that is used for object being treated is carried out powder coating, it is characterized in that it has following operation: suspention with parts on the suspention object being treated operation, by operation to being applied the operation of this powder coating by described suspention with the object being treated spraying powder coating of parts suspentions and suspention being had the described suspention of the object being treated that has applied powder coating blow with parts.

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