JPH0642965U - Electro-deposition coating device - Google Patents

Abstract

(57) [Summary] [Purpose] Even if the objects to be coated on the conveyor hanger and to be dipped in the electrodeposition coating solution at the same time are uneven in size, a uniform thickness of electrodeposition coating is applied to each object. To enable high quality film formation. A shield member (31) is provided which shields the objects to be coated immersed in the electrodeposition coating solution in the electrodeposition tank (1) without interfering with the objects to be coated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electrodeposition coating device.

[0002]

[Prior art]

 FIG. 3 shows a schematic configuration of a conventional electrodeposition coating apparatus. In the figure, reference numeral 1 is an electrodeposition tank containing a coating liquid, and has a size capable of simultaneously immersing a plurality of (for example, 5 to 6) objects (vehicle bodies) W to be coated. In the electrodeposition tank 1, a predetermined number of anode members (all not shown) to which a positive voltage is supplied are arranged. Reference numeral 21 denotes a cathode member, which is supplied with a ground voltage from a power source. Further, 5 is a conveyor, and 6 is a hanger, which is connected to the conveyor 5 and supports the object W to be coated and electrically connects the cathode member 21 and the object W to be coated. That is, the hanger 6 has a sliding contact portion that is in sliding contact with the cathode member 21.

Then, each object W to be coated is supported (suspended) by the hanger 6, is conveyed by the conveyor 5 moving in the direction of the arrow in the figure, and is immersed in the electrodeposition tank 1. Here, since the hanger 6 is in contact with the cathode member 21 by the sliding contact portion and is energized, the ground voltage is applied to the object W to be coated. At this time, in the electrodeposition tank 1, the object W to be coated becomes a negative electrode with respect to the anode member, and colloidal particles such as emulsion dispersed in the coating liquid have a positive charge themselves, so By moving to the periphery of a certain coating object W and supplying electrons from the coating object W which is the cathode, the repulsive force between the particles is reduced and the particles are coagulated and deposited on the coating object W, thereby W is painted.

Here, in automobile body painting and the like, it is required to strictly control the film thickness of the electrodeposition coating film within the range of 20 μm to 30 μm (± 15%). If the thicknesses are not uniform, there is a problem that accurate film thickness control becomes impossible.

That is, recently, due to the adoption of the mixed production method, a large-sized vehicle (usually a luxury vehicle) or a small-sized vehicle (usually a low-priced vehicle) such as a large-sized vehicle (usually a low-priced vehicle) can be randomly loaded with objects W to be coated. However, in such a case, if current control is performed according to the film thickness of a large vehicle with a large surface area, a small vehicle with a small surface area will be thickly applied, resulting in waste of paint.

Therefore, in order to solve the above-mentioned inconvenience, there has been proposed an electrodeposition coating apparatus that controls the energization individually according to the type (large or small) of the article W to be coated (Publication Sho 63- 48696, JP-A-1-246397, etc.).

FIG. 4 shows an electrodeposition coating apparatus capable of individually controlling energization. In such an electrodeposition coating apparatus, the cathode member 21 is divided into a low-voltage rail portion 22 and a high-voltage rail portion composed of a plurality of division rail portions (23a, 23b, 23c), and the object to be coated is Discriminating means (photoelectric sensor 46) for discriminating the type (large or small) of W and a plurality of cathode members 21 (mainly divided rails constituting a high voltage rail portion) according to the detection output from the discriminating means (46). The parts 23a, 23b, 23c) are provided with energization adjusting means (energization controller 41, electromagnetic switches M1, M2, M3) for selectively energizing the parts. The split rail portions 23a, 23b, 23c are formed so that the length thereof is not more than the pitch L between the hangers 6, 6. In FIG. 4, reference numeral 45 is a limit switch for detecting the presence or absence of the hanger 6. Further, 11 is an anode member, and 49 is a power source. Then, the energization controller 41 controls the opening and closing of the electromagnetic switches M1, M2, M3 to sequentially energize the large object W (A) from all the divided rail portions 23a, 23b, 23c, and the medium size The coated object W (B) is energized from the divided rail portions 23a and 23b except the divided rail portion 23c, and the small coated object W (C) is energized only from the divided rail portion 23a.

[0008]

[Problems to be solved by the device]

 By the way, in the conventional electrodeposition coating apparatus shown in FIG. 4, after the energization of the small object W (C) is stopped, the front and rear large and medium objects W (A), W (B) are applied. When electricity is applied to the object, a bipolar phenomenon occurs, and the paint that has begun to adhere to the surface of the small object W is pulled by the objects W (A) and W (B) on the front and rear sides, forcing it. It may be peeled off and rough skin may occur.

In view of the above-mentioned circumstances, an object of the present invention is to provide a uniform thickness of each coated object even if the coated objects supported by the hanger of the conveyor and simultaneously dipped in the coating liquid are uneven in size. An object of the present invention is to provide an electrodeposition coating apparatus capable of forming various electrodeposition coating films.

[0010]

[Means for Solving the Problems]

 The electrodeposition coating apparatus according to the present invention comprises an electrodeposition tank containing a coating liquid in which an object to be coated is immersed, and a predetermined number of first electrode members connected to one end of a power source and arranged in the electrodeposition tank. A second electrode member which is connected to the other end of the power source and is divided into a plurality of parts, and which is connected to the conveyor and supports the object to be coated and electrically connects the second electrode member and the object to be coated. A hanger, a discriminating means for discriminating the type of the article to be coated, and an energization adjusting means for selectively energizing a plurality of second electrode members according to a detection output from the discriminating means. The electrodeposition coating apparatus is characterized in that a shield member is provided that can shield between the objects to be coated immersed in the coating liquid in the electrodeposition tank without interfering with the objects to be coated.

[0011]

[Action]

 According to the present invention having the above-described configuration, when the energization adjusting means individually adjusts the energization for each of the large and small objects to be coated which are simultaneously immersed in the coating liquid in the electrodeposition tank, for example, a small coating Even if the front and rear objects are energized after the object has been de-energized, the bipolar phenomenon does not occur because the shield member is provided between the objects. In other words, since the electric field in the front and rear objects to be coated does not reach the small object to be coated by the shield member, the paint attached to the object to be coated is not pulled toward the objects to be coated in the front and rear.

Therefore, even if the objects to be coated, which are supported by the hanger of the conveyor and are simultaneously immersed in the coating liquid, are uneven in size, a uniform electrodeposition coating film with a constant thickness is provided on each object with high quality. Can be formed.

[0013]

【Example】

 FIG. 1 is a diagram for explaining an embodiment of the present invention, and FIG. 2 is a diagram showing the shape of a shield member.

Embodiments of the present invention will be described below with reference to the drawings. This electrodeposition coating apparatus has a basic configuration [electrodeposition tank 1, conveyor 5, hanger 6, anode part 11, cathode member 21 (low voltage rail part 22, split rail part 23a constituting high voltage rail part). , 23b, 23c), the energization controller 41, the electromagnetic switches M1, M2, M3, etc.) are the same as those of the conventional example (FIG. 4), and each coated object is immersed in the coating liquid in the electrodeposition tank 1. A shield member for blocking between [W (A), W (B), W (C), etc.] without interfering with the object [W (A), W (B), W (C), etc.]. 31 is provided.

The same or common components as those of the conventional example (FIG. 4) are designated by the same reference numerals, and detailed description thereof will be omitted.

Here, the shield member 31 is provided between the coating objects [W (A), W (B), W (C), etc.] immersed in the coating liquid in the electrodeposition tank 1 between the coating materials. The object [W (A), W (B), W (C), etc.] can be shielded without interfering with the object. In the present embodiment, the shield member 31 is provided on the hangers 6, 6, 6 ... Supporting the objects W (A), W (B), W (C). ), W (B), and W (B), W (C) ... As shown in FIG. 2, the shield member 31 is curved so as to project in the transport direction (the direction of the arrow in the figure) so that the fluid resistance becomes small.

It should be noted that each of the coated objects [W (A), W (B), W (C) ...] Soaked in the coating liquid is prevented from becoming rough due to a bipolar phenomenon. , W (B), W (C) ...] can be shielded by any method.

For example, the shield member may be composed of a pair of shield members having a double door structure provided in the electrodeposition tank 1 at a predetermined pitch. Each pair of shielding members is rotatably provided at a predetermined position on both inner side walls of the electrodeposition tank 1 and is positioned by a spring member at a position to normally close the moving path of the object to be coated, so that each object passes through. At times, the spring member is elastically deformed and rotated in the opening direction so as to allow the object to be coated to pass therethrough.

Further, the shield member may be composed of a predetermined number of shield members that can be inserted into and taken out of the electrodeposition tank 1. Each shielding member is provided so as to shut off between the objects to be coated which are conveyed in the coating liquid and to be taken out of the tank when the objects to be coated pass therethrough so as to be able to retract upward.

The energization controller 41 switches the switch signal of the detection switch (limit switch) 45 for detecting the presence of the hanger 6 transferred to the entry side of the electrodeposition tank 1 and when the switch signal is output. Energization control of the divided rail portions 23a, 23b, 23c with which the respective hangers 6 are successively slidably contacted on the basis of the detection signal of the photoelectric sensor 46 for determining the presence or absence of the article to be coated placed on the hanger 6 and its size and the conveyor synchronization signal. It is configured to perform That is, when the switch signal of the detection switch 45 is input, the energization controller 41 starts counting the conveyor synchronization signal and determines the time during which the hangers 6 are brought into sliding contact with the divided rail portions 23a, 23b, 23c sequentially. Based on the detection signal input from the photoelectric sensor 46, the presence or absence and the size of the object to be coated placed on each hanger 6 are determined.

When the article W is not placed on the hanger 6, the control signal CP1, which opens the electromagnetic switches M1, M2 and M3 when the hanger 6 passes through the low voltage rail portion 22, CP2 and CP3 are sequentially output at a predetermined timing to sequentially stop energization of the divided rail portions 23a, 23b, 23c with which the hanger 6 slides.

When a large object W (A) is placed on the hanger 6, a control signal for closing the electromagnetic openers M1, M2, and M3 is sequentially output, and the hanger 6 slides. All the divided rail portions 23a, 23b, 23c are sequentially energized.

When the medium-sized object W (B) is placed on the hanger 6, control signals CP1 and CP2 for closing the electromagnetic switches M1 and M2 and control for opening the electromagnetic switch M3. The signal CP3 is sequentially output to sequentially energize the divided rail portions 23a and 23b with which the hanger 6 is in sliding contact, and to stop the energization to the divided rail portion 23c.

Further, when a small article W (C) is placed on the hanger 6, a control signal CP1 for closing the electromagnetic switch M1 and control signals CP2 and CP3 for opening the electromagnetic switches M2 and M3. Is sequentially output to energize only the split rail portion 23a and sequentially stop energizing to the other split rail portions 23b and 23c.

Next, the operation of this embodiment will be described. Energization adjusting means (41, M1,) for the large and small unevenly coated objects [W (A), W (B), W (C), ...] Simultaneously immersed in the coating liquid in the electrodeposition tank 1 When the energization is individually adjusted by M2, M3), for example, after the energization of the small object W (C) is stopped, the front and rear objects W (A), W (B) Even if electricity is applied, the bipolar phenomenon does not occur because the shield member 31 is interposed between the objects W (A), W (C) and W (C), W (B). That is, the electric field in the front and rear objects W (A) and W (B) does not reach the small object W (C) due to the shield member 31, so that the coating material attached to the object W (C) is applied. Is not pulled toward the front and rear objects W (A) and W (B).

However, according to this embodiment, the space between the coating objects [W (A), W (B), W (C), ...] Soaked in the coating liquid in the electrodeposition tank 1 is Since the shield member 31 capable of blocking without interfering with the respective objects to be coated [W (A), W (B), W (C), ...] Is provided, it is supported by the hanger 6 of the conveyor 5. Even if the objects to be coated [W (A), W (B), W (C), ...] that are simultaneously dipped in the coating liquid are uneven in size, each object [W (A), W ( B), W (C), ...] can form a high-quality uniform electrodeposition coating film having a constant thickness.

Further, since the shield member 31 is connected to the hanger 6, the objects to be coated [W (A), W (B), W (C) ...] can be formed without complicating or increasing the size of the structure. It is possible to form a high-quality uniform electrodeposition coating film having a uniform thickness.

Further, since the shield member 31 is curved so as to project in the conveying direction, the fluid resistance is reduced and the paint liquid can be smoothly conveyed.

[0029]

[Effect of device]

 According to the present invention, since the shield member is provided so as to be able to shield the objects to be coated immersed in the coating liquid in the electrodeposition tank without interfering with the objects to be coated, the hanger of the conveyor is provided. Even if the objects to be coated and immersed in the electrodeposition coating solution at the same time are not uniform in size, a uniform electrodeposition coating film having a constant thickness can be formed on each object with high quality.

[Brief description of drawings]

FIG. 1 is a diagram for explaining an embodiment of the present invention.

FIG. 2 is a view showing the shape of a shield member similarly.

FIG. 3 is a diagram for explaining a schematic configuration of a conventional electrodeposition coating apparatus.

FIG. 4 is a diagram for explaining a conventional electrodeposition coating apparatus capable of individually energizing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electrodeposition tank 5 Conveyor 6 Hanger 11 Anode member 21 Cathode member 22 Low-voltage rail part 23a, 23b, 23c Split rail part 31 Shield member 41 Energization controller (energization adjustment means) 46 Photoelectric sensor (discrimination means)

Claims (1)

[Scope of utility model registration request] 1. An electrodeposition tank containing a coating liquid in which an object to be coated is immersed, a predetermined number of first electrode members connected to one end of a power source and arranged in the electrodeposition tank, and a power source A second electrode member that is connected to the end and is divided into a plurality of pieces; a hanger that is connected to the conveyor and that supports the object to be coated and electrically connects the second electrode member and the object to be coated; An electrodeposition coating apparatus comprising: a discrimination means for discriminating the type of an object, and an energization adjustment means for selectively energizing a plurality of second electrode members according to a detection output from the discrimination means, An electrodeposition coating apparatus comprising a shield member capable of blocking a space between coating objects immersed in a coating liquid in a coating tank without interfering with the coating objects.