JP2003117441A - Electrostatic coating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate to attach/detach an earth cable 5 to/from a bumper 1, to prevent the earth cable 5 from falling off from a frame 3 and to facilitate to replace the earth cable 5. SOLUTION: A pinching tool 43 is connected to the one end of the earth cable 5, and a cap-shaped terminal 33 to the other end. The pinching member 43 is replaceably held by pinching the lower wall part 11 of the bumper 1. The cap-shaped terminal 33 is replaceably fitted on the outside of a projecting terminal 35 attached to the frame 3. The projecting terminal 35 is grounded in a dischargeable way.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an electrostatic coating apparatus.

[0002]

2. Description of the Related Art Conventionally, as an object to be electrostatically coated, one disclosed in JP-A-11-240125 is known.

The above publication discloses a wood-based decorative material that is electrostatically coated. The wood decorative material includes a decorative veneer on the front surface, a base material made of synthetic resin and laminated on the back surface of the decorative veneer, and a conductive sheet laminated on the back surface of the base material. In this woody decorative material, when the decorative veneer is electrostatically coated, the decorative veneer and the conductive sheet are electrically connected by the conductive paint sprayed on the ostium of the wooden decorative material. By the way, in the case of electrostatic coating, if electrostatic repulsion occurs, electrostatic coating cannot be properly performed, and thus it is necessary to discharge static electricity on the object to be coated. Therefore, in order to enable electrostatic coating of decorative veneers, grounding a conductive sheet via a grounding wire makes it possible to discharge the static electricity of the paint on the decorative veneers. It becomes possible to do.

[0004]

By the way, in the case where a plurality of objects to be coated are successively electrostatically coated, the objects to be coated are placed on a pedestal for electrostatic coating, and after the coating is completed, the coated object to be coated is painted. It is conceivable to remove the body from the gantry and place the unpainted body on the gantry for electrostatic coating.

Here, the object to be coated is placed on a pedestal, while the pedestal is placed on the surface of the earth. Therefore, if a grounded part is provided on the pedestal and the above part and the object to be coated are connected by a ground cable, the static electricity on the object to be painted can be discharged through the part, and proper electrostatic coating can be performed. It can be performed.

[0006] As described above, in the case of continuously electrostatically coating the object to be coated using the frame and the ground cable,
When replacing a painted object with an unpainted object, first remove one end of the ground cable from the painted object, then remove the object from the stand, and then The object to be coated is placed on a frame, and one end of the ground cable is attached to the object to be coated which has not been coated.

Here, as a method for attaching the ground cable to the article to be coated, it is conceivable to connect an attachment of a fitting structure of outer fitting or inner fitting to one end of the ground cable. However, in this case, it is necessary to provide a projection, a recess, or the like that fits the fixture on the object to be coated. Also,
Every time the painted object and the unpainted object are replaced, it is necessary to remove and attach the ground cable to the object. Here, if the fixture connected to one end of the ground cable is the fixture having the above-described fitting structure, the fixtures must be fitted to each other, which makes the above-mentioned work troublesome.

Further, it is conceivable that the pedestal is movably formed so that the object to be coated can be transported. When such a stand is used, the painted object is lowered, and then the stand is moved to the unpainted object while the ground cable is suspended. Here, if a clamp is provided at the other end of the ground cable and the clamp is used to attach the ground cable to a grounded portion on the pedestal, in this case, it can be said that the above-mentioned portion on the cradle is pinched, which is by no means firm. Since the installation method is not available, there is a risk that the ground cable may drop from the gantry due to vibration of the gantry accompanying the movement of the gantry.

Therefore, it is preferable to fix the other end of the ground cable to the above-mentioned portion in order to prevent the ground cable from falling off the frame. However, in this case, when replacing the ground cable whose function has deteriorated as a result of repeated use with a new ground cable, if the other end of the ground cable is fixed to the above portion, the above replacement cannot be easily performed.

The present invention has been made in view of the above points, and an object of the present invention is to facilitate the work of removing and attaching the ground cable from the object to be coated and to remove the ground cable from the mount of the ground cable. Prevent falling off,
Another object is to facilitate the work of replacing the ground cable.

[0011]

According to a first aspect of the present invention, there is provided a gantry on which an object to be coated having a conductive portion to be electrostatically coated is placed,
An electrostatic coating apparatus comprising an earth member for earthing an object to be coated placed on the gantry, wherein the gantry comprises:
A conductive holder that has a grounded protruding terminal, and the grounding member is detachably held on the object to be coated so as to come into contact with the conductive portion of the object to be coated mounted on the frame. ,
It has a conductive cap-shaped terminal that is detachably fitted to the projecting terminal, and an earth cable that connects the holder and the cap-shaped terminal.

By the way, the work of holding by the holder is
This can be performed more easily than the work of fitting the fittings of the fitting structure. Here, the above-mentioned holding tool is a holding tool that nips the edges or ribs of the object to be coated with an elastic force, or a holder that is elastically pressed between two wall portions of the object to be coated. It is a non-fitting structure holder such as. Therefore, by attaching one end of the ground cable to the conductive object to be coated via the above-mentioned holder, it is necessary to attach and detach the earth cable when replacing the painted object and the unpainted object. The work of can be executed easily and promptly.

Further, since the object to be coated is held by the holder connected to one end of the ground cable, unlike the case where the fitting of the fitting structure is connected to one end of the ground cable, the object to be coated is There is no need to separately provide a projection or a recess for fitting the fitting of the fitting structure on the top, and it can be applied to various types of objects to be coated and is versatile.

The cap-shaped terminal connected to the other end of the ground cable is removably fitted on the protruding terminal provided on the frame. Here, the attachment of the ground cable via the cap-shaped terminal is firmer than the attachment of the ground cable via the holder because the cap-shaped terminal is firmly fitted to the protruding terminal. Therefore,
Even if the ground cable is suspended from the base after removing one end of the ground cable from the painted object, the ground cable will not drop from the base due to vibration of the base.

Further, since the cap-shaped terminal is easily attached and detached, when replacing the above-mentioned ground cable with a new ground cable, unlike the case where the terminal of the ground cable is fixed to a grounded portion on the frame with a fixture such as a screw. , The replacement work can be easily performed.

Further, since the cap-shaped terminal is externally fitted to the protruding terminal, the protruding terminal is covered with the cap-shaped terminal during electrostatic coating. Will not adhere. Therefore, unlike when the cap-shaped terminal is fitted inside the protruding terminal, when the ground cable is replaced, the paint that adheres makes it difficult for the cap-shaped terminal to fit on the protruding terminal or adheres to the protruding terminal. There will be no problems such as work to remove the paint and no increase in man-hours.

According to a second aspect of the present invention, the mount is movably formed so that the placed object to be coated can be conveyed.

Thus, the object to be coated placed on the frame can be conveyed, and a plurality of objects to be coated can be continuously electrostatically coated, and mass productivity can be improved.

[0019]

According to the first aspect of the present invention, the holder connected to one end of the ground cable is detachably held by the electrically conductive portion of the object to be coated. It is possible to easily and quickly carry out the work of attaching and detaching the ground cable, which has to be carried out when replacing the unpainted body with the unpainted body.

Since the object to be coated is held by the holder connected to one end of the ground cable, it is not necessary to separately provide a protrusion for attaching the holder on the object to be coated.

Further, since the cap-shaped terminal connected to the other end of the ground cable is detachably fitted onto the projecting terminal provided on the frame, one end of the ground cable is removed from the painted object. Even after the ground cable is suspended from the stand after removal, the ground cable will not fall off the stand due to vibration of the stand.

Further, since the cap-shaped terminal is easily attached and detached, when replacing the ground cable with a new ground cable, the replacement work can be easily performed.

Further, since the cap-shaped terminal is externally fitted to the protruding terminal, the paint does not adhere to the surface of the protruding terminal, so that it is difficult to fit the cap-shaped terminal to the protruding terminal by the adhered paint. In addition, the coating material does not make it difficult to fit the cap-shaped terminal to the protruding terminal, and the work such as removing the coating material attached to the protruding terminal does not cause an increase in the number of man-hours.

According to the second aspect of the present invention, the object to be coated placed on the gantry can be transported, and a plurality of objects to be coated can be continuously electrostatically coated, which improves mass productivity. be able to.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a front view of a vehicle bumper 1 to be electrostatically coated and a pedestal 3 on which the bumper 1 is mounted, which are connected by a ground cable 5.

The bumper 1 is formed by injection molding of a molten resin material or vacuum molding of a plate-shaped resin material, and is made of a non-conductive resin material. As shown in FIG. 2, the bumper 1 is integrally formed with a plate-shaped upper wall portion 7, a vertical wall portion 9 and a lower wall portion 11 in a substantially U-shaped cross section. A conductive coating material is applied on the surface of the bumper 1 to form a conductive coating film 12. As the conductive paint, a paint obtained by mixing chlorinated olefin resin with carbon or titanium oxide is used. The conductive coating film 12 is not formed on the back surface of the bumper 1.

The frame 3 is made of a conductive material such as metal. As shown in FIG. 1, the gantry 3 includes a support portion 13 that supports the bumper 1, an upper plate portion 27, a support rod 29, and
The lower plate portion 15, the support portion 13, the upper plate portion 27, the support rod 29, the pillar portion 17 that supports the lower plate portion 15, and the lower floor portion 19.

The support portion 13 is composed of a support 21, a horizontal rod 23 and a vertical rod 25. The support tools 21 are provided at both ends of the horizontal bar 23, are formed along the back surface of the bent portion of the bumper 1, and support the bumper 1 at the bent portion. The horizontal rod 23 is supported on the upper plate portion 27 by two vertical rods 25, and the upper plate portion 27 supports the support rod 2
9 is supported on the lower plate portion 15, and the lower plate portion 15
Is supported on the lower floor portion 19 by the pillar portion 17. On the upper surface of the lower plate portion 15, a protruding terminal 3 to which a conductive cap-shaped terminal 33 connected to the other end of the ground cable 5 is fitted.
5 is projected in the vertical direction. The protruding terminal 35 is conductive and is formed in a cylindrical shape. The tip end of the projecting terminal 35 is formed with a small diameter at its upper end so that the cap-shaped terminal 33 can be easily fitted (see FIG. 4). The lower floor portion 19 is a plate-like body, and wheels 39 are provided on the lower surface of the lower floor portion 19, so that the gantry 3 can move on the rails 41. The rail 41 is made of a conductive material such as metal.

A holding tool 43 as a holding tool is connected to one end of the ground cable 5. The clamp 43 is a spring 44.
The end of the bumper 1 is clamped by the elastic force of. That is, as shown in FIG.
It is detachably clamped to the lower wall portion 11. Clamp 43
Is a pair of holding pieces 46 having a holding portion 45 and a handle portion 47.
The spring 44 urges the sandwiching portions 45 toward each other at the longitudinal intermediate portion thereof.
The holding portion 45 is made of a conductive material such as metal and is connected to one end of the ground cable 5. As shown in FIG. 3, a notch portion 45a for increasing the holding force is formed at the tip of the holding portion 45 that comes into contact with the lower wall portion 11.

The electrostatic coating process will be described below.

First, as shown in FIG. 1, a pedestal 3 provided on a rail 41 and equipped with a ground terminal 5 having a cap-shaped terminal 33 fitted on a protruding terminal 35 is preliminarily provided with a conductive coating film on its surface. Bumper 1 to be coated with 12
After mounting the clamp 43 on the lower wall 11 of the bumper 1 and moving the gantry 3 to the place where electrostatic coating is performed,
Perform electrostatic coating on bumper 1. Next, in order to dry the paint, the painted bumper 1 is baked. afterwards,
The gripping tool 43 is removed from the lower wall portion 11 of the bumper 1, and the painted bumper 1 is unloaded from the frame 3. Then, after moving the gantry 3 again to the electrostatic coating place where the bumper 1 as the object to be coated is mounted, the bumper 1 which is not electrostatically coated is mounted, and the holding tool 43 is attached to the lower wall portion 11 of the bumper 1. Attach to. Then, the above work is repeated. In addition, after using the ground cable 5 to some extent, a new ground cable 5
Replaced by.

According to this embodiment, the holding tool 43 connected to one end of the ground cable 5 has the lower wall portion 11 of the bumper 1.
Is sandwiched between. Therefore, painted bumper 1
It is possible to easily and quickly carry out the work of attaching and detaching the ground cable 5, which has to be performed every time when the unpainted bumper 1 is replaced.

Further, since the bumper 1 is held by the holding tool 43 connected to one end of the ground cable 5, a projection, a recess, etc. for fitting the fitting of the fitting structure are separately provided on the bumper 1. No need.

The cap-shaped terminal 33 connected to the other end of the ground cable 5 is a projecting terminal 3 projecting from the frame 3.
It is fitted on 5. Here, since the cap-shaped terminal 33 is firmly fitted to the protruding terminal 35, the cap-shaped terminal 3
Attachment of the ground cable 5 via 3 is strong. Therefore, even if one end of the ground cable 5 is removed from the lower wall portion 11 of the painted bumper 1 and then the ground cable 5 is suspended from the pedestal 3, the ground cable 5 also falls off the pedestal 3. There is no such thing.

Further, since the cap-shaped terminal 33 is fitted onto the protruding terminal 35 provided on the pedestal 3 so as to cover the protruding terminal 35, the paint adheres to the surface of the protruding terminal 35 during painting. There is nothing to do. Therefore, when the earth cable 5 is replaced, it becomes difficult to fit the cap-shaped terminal 33 to the protruding terminal 35 due to the adhered paint, or a problem such as a work for removing the paint adhered to the protruding terminal 35 and an increase in the number of man-hours occur. There is no such thing.

Since the cap-shaped terminal 33 connected to the other end of the ground cable 5 is removable, the work of replacing the ground cable 5 with a new ground cable 5 can be easily performed.

Further, the holding tool 43 is held by the lower wall portion 11 as an invisible portion of the bumper 1 (a portion of the bumper 1 that enters a blind spot after the bumper 1 is attached to the vehicle). By the way, the portion where the holding tool 43 is held cannot be painted. However, since the holding tool 43 is held by the lower wall portion 11 as an invisible portion, this unpainted portion does not come into contact with human eyes. Therefore, the appearance of the bumper 1 can be kept beautiful.

Further, since the gantry 3 can be moved on the rail 41, the bumper 1 placed on the gantry 3 can be transported, and a plurality of bumpers 1 can be continuously electrostatically coated. The mass productivity can be improved.

In the present embodiment, the pedestal 3 as a whole has conductivity, but at least the protruding terminal 35 may be grounded so that it can be discharged.

Further, in the present embodiment, the ground cable 5
Is attached to the bumper 1 by the sandwiching tool 43, but is attached between the two wall portions of the bumper 1, for example, two ribs formed on the back surface of the bumper 1 by a retainer that presses elastically. Good.

Further, in the present embodiment, the holding tool 43 is held by the elastic force of the spring, but may be held by the elastic force of an elastic body other than the spring.

Further, in the present embodiment, the holding tool 43 is held by the lower wall portion 11 as a non-visible portion of the bumper 1, but may be held by another non-visible portion of the bumper 1.

Further, in the present embodiment, the protruding terminal 35 has a cylindrical shape, but it may have another shape such as a prismatic shape. In this case, the shape of the cap-shaped terminal 33 is also changed according to the shape of the protruding terminal 35.

Further, in the present embodiment, the protruding terminal 35 is provided so as to project in the vertical direction, but it may be provided so as to project in another direction such as an oblique direction.

Further, in the present embodiment, the protruding terminal 35 is installed on the upper surface of the lower plate portion 15 of the gantry 3. However, when the ground cable 5 is suspended from the gantry 3, the ground cable The protruding terminal 35 may be installed at any position on the pedestal 3 as long as the holding tool 43 connected to one end of 5 does not contact the ground.

Further, the holding tool 4 for the earth cable 5 in a state where the unpainted bumper 1 is not mounted on the frame 3
The clamp 3 may be hooked on the lower plate portion 15 or the upper plate portion 27 without being suspended from the gantry 3.

Further, although the bumper 1 is made of a non-conductive resin material in this embodiment, it may be made of a conductive resin material. In this case, it is not necessary to form the conductive coating film 12 on the surface of the bumper 1.

Further, in this embodiment, the gantry 3 is provided with the rail 4
It is possible to move above 1, but it may be installed directly on the ground.

In this embodiment, the case where the bumper 1 is electrostatically coated has been described, but the present invention is also applied to the case where another automobile part having a conductive portion or a body to be coated other than the automobile part is electrostatically coated. can do.

[Brief description of drawings]

FIG. 1 is a front view of a state where a bumper to be electrostatically coated and a mount on which the bumper is placed are connected by a ground cable.

FIG. 2 is a cross-sectional view taken along the line AA of FIG.

FIG. 3 is an enlarged view of the vicinity of a bumper held by a holding tool in FIG.

FIG. 4 is a transverse cross-sectional view of a cap-shaped terminal externally fitted to the protruding terminal according to the present embodiment.

[Explanation of symbols]

1 Bumper (body to be coated) 3 mounts 5 ground cable 11 Lower wall 12 Conductive coating 13 Support 15 Lower plate 17 Pillars 19 Lower floor 33 Cap terminal 35 protruding terminals 41 rails 43 Clamping tool (holding tool)

Claims (2)

[Claims] 1. An electrostatic coating apparatus comprising: a gantry on which an object to be coated having a conductive portion to be electrostatically coated is placed; and a grounding member for grounding the object to be coated placed on the gantry. The mount has a protruding terminal that is grounded, and the grounding member is detachably held by the body to be coated so as to come into contact with the conductive portion of the body mounted on the base. Electrostatic coating having a conductive holder for holding the holder, a conductive cap-shaped terminal that is detachably fitted to the protruding terminal, and an earth cable connecting the holder and the cap-shaped terminal. apparatus. 2. The electrostatic coating apparatus according to claim 1, wherein the pedestal is formed so as to be movable so as to convey a placed object to be coated.