JP2723114B2 - Method and apparatus for electrodeposition coating of electrical equipment case - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrodeposition coating method for coating a case of electric equipment such as a transformer and a switch, and an electrodeposition coating apparatus used for performing the method. Things.

[Prior art] In the electrodeposition coating method, a pre-treatment step of subjecting an object to be subjected to a surface treatment such as degreasing or chemical conversion treatment, and an object to be coated and electrodeposited while the object is placed in an electrodeposition tank and transported. An electrodeposition step of forming a coating film by applying a DC voltage between the tank and a post-treatment step of washing and drying the object on which the coating film is formed is sequentially performed.

When applying an electrodeposition coating to a bottomed electrical equipment case having an open end, it is necessary to prevent the accumulation of air or paint in the case when the electrical equipment case is immersed in the electrodeposition tank. When the air pool is generated, the coating cannot be formed because the paint does not enter into the air pool. Further, when the paint pool is generated, a good coating film having a uniform film thickness cannot be formed. The air accumulation and the paint accumulation are particularly likely to occur when an electrodeposition coating is applied to an electric equipment case having a complicated shape, such as a transformer case having a radiation fin.

Also, in order to immerse the bottomed electrical equipment case in the paint in the electrodeposition tank, it is necessary to prevent the case from floating when entering the tank.

In order to cope with the above-mentioned problem, in the method disclosed in Japanese Patent Application Laid-Open No. 61-210200, one chain conveyor is arranged above the electrodeposition tank, and the conveying direction of this conveyor (the The two ends of the electrical device case are held and suspended by two hangers provided at intervals in the longitudinal direction), and the guide rails of the conveyor are moved so that the two hangers are moved along a vertically curved locus. By forming the case, the height position of both ends of the case is changed so that the case is swung in the process of conveyance.

[Problems to be Solved by the Invention] As described above, the case is suspended by the two hangers provided at intervals in the transport direction of the chain conveyor, and the electrical device case is transported in a state of being directed in the transport direction. If it does so, the electrical equipment case will occupy much space in the conveyance direction during the conveyance process. Therefore, in order to secure the time required for electrodeposition in the electrodeposition step, the length of the electrodeposition tank needs to be considerably long, and there has been a problem that a large installation area of the apparatus is required.

In addition, when the electric device case is swung in the transport direction as described above, the number of electric device cases that can be immersed per unit length of the electrodeposition tank cannot be increased so much that the coating operation is not performed. Inefficiency was inevitable.

Furthermore, when the electrical equipment case is transported in the transport direction, the bottom of the case is directed forward in the advancing direction because the paint is discharged from the case when the case is lifted from the electrodeposition tank after the electrodeposition step. Need to be kept. Therefore, when the case enters the paint, the case may hit the liquid surface of the paint and attempt to float, and it may take time to sink the case into the paint.

Also, when the electrical device case is transported in the transport direction as described above, if the inclination angle of the electrical device case during transport is too tight, excessive force is applied to the conveyor, making it difficult to perform smooth transport. Become. For this reason, the rocking in the electrodeposition tank cannot be sufficiently performed, and the air pool and the paint pool cannot be completely eliminated.

An object of the present invention is to provide a method and an apparatus for electrocoating an electric equipment case that can be conveyed while swinging the electric equipment case without increasing the length of the electrodeposition tank.

Another object of the present invention is to provide a method and an apparatus for electrodeposition coating of an electric equipment case in which an electric equipment case can be sufficiently swung in an electrodeposition tank to eliminate air accumulation and paint accumulation. It is in.

Still another object of the present invention is to provide a method and an apparatus for electrodeposition coating an electric equipment case capable of improving the work efficiency by increasing the number of electric equipment cases that can be immersed per unit length of an electrodeposition tank. Is to provide.

[Means for Solving the Problems] In a first method of the present invention, a bottomed electric equipment case having an open end is immersed in a paint in an electrodeposition tank having a predetermined length. Voltage between the electrodeposition tank and
This is a method for coating an electrical equipment case in which a coating film is formed on the surface of the electrical equipment case while transporting the electrical equipment case along the longitudinal direction of the electrodeposition tank.

In the present invention, a first and a second transporting device provided above the electrodeposition tank and provided at a predetermined distance in the width direction of the electrodeposition tank by providing a transport device extending along the longitudinal direction of the electrodeposition tank. The electric device case is suspended from the transport device while holding the bottom end and the open end portion of the electrical device case by the hanger, and the first and second processes are performed in the process of transporting the electrical device case by the transport device. The height of the lower end of the hanger is changed to swing the electric device case.

Further, in the second method of the present invention, after performing a pretreatment step of performing a surface treatment on the electric equipment case using the bottomed electric equipment case having an open end as an object to be coated, the electric equipment case is fixed to a predetermined length. While immersing in the paint in the electrodeposition tank having a thickness and applying a voltage between the electric equipment case and the electrodeposition tank while transporting the electric equipment case along the longitudinal direction of the electrodeposition tank. An electrodeposition coating method for an electrical equipment case, which includes performing an electrodeposition step of forming a coating film on the surface of the electrical equipment case, and then performing a post-treatment step of cleaning and drying the electrical equipment case. A first conveyor is provided from a region where a processing step is performed to a region where a post-processing step is performed through a region where an electrodeposition process is performed. Also, a second conveyor is provided in a region where the electrodeposition step is performed, and the first and second conveyors are arranged at a predetermined distance in the width direction of the electrodeposition tank. Further, the first and second conveyors are respectively provided with first and second hangers arranged at a predetermined distance in the width direction of the electrodeposition bath in the electrodeposition step. In the pretreatment step, the bottom end of the electrical equipment case is held by the first hanger, and the electrical equipment case is transported in a state of being suspended upside down. In the electrodeposition step, the electrical equipment case is hung from the transport device while the bottom end and the end on the opening side of the electrical equipment case are held by the first and second hangers, respectively. Then, the electric device case is swung by changing the height position of the lower ends of the first and second hangers in the process of transporting the electric device case, and the electric device case is lifted from the electrodeposition tank when the electric device case is lifted. By making the end on the bottom side of the case higher than the end on the opening side, the second hanger is removed from the electrical equipment case, and the electrical equipment case is suspended upside down.

When the electric device case is swung in the electrodeposition step, the electric device case is completely immersed in the paint, and the end on the opening side is directed obliquely upward in the paint. It is preferable that the electrical device case is finally suspended upside down with its side end gradually directed downward.

The apparatus of the present invention is an electrocoating tank having a predetermined length, and a transfer device for transferring the electric equipment case along the longitudinal direction of the electrocoating tank using an electric equipment case having a bottom and an open end at one end as an object to be coated. And a voltage applying means for applying a voltage between the electric equipment case and the electrodeposition tank.

In the present invention, the first transporting device is disposed above the electrodeposition tank at a predetermined distance in the width direction of the electrodeposition tank.
And a second conveyer, and first and second hangers suspended from the first and second conveyers, respectively, and transferred by the first and second conveyers along the longitudinal direction of the electrodeposition tank. Have. Each of the first and second hangers has a case holding portion at a lower end thereof for holding an end on the bottom side and an end on the opening side of the electrical equipment case, and the first and second hangers are provided.
Is configured such that the height positions of the case holding portions of the first and second hangers are different in the process of transferring the first and second hangers.

As the first and second conveyors, a chain conveyor that moves a chain along a curved guide rail so that the height of each part changes along the longitudinal direction of the electrodeposition tank can be used.

Preferably, the case holding portion of the second hanger is formed of a hook-like hook, and the hook hooks and holds the end of the case on the opening side from the inside.

The case holding portion of the second hanger can be constituted by a hook-like hook that hooks and holds the opening-side end of the case from inside.

[Operation] As described above, the first and second hangers arranged at a predetermined distance in the width direction of the electrodeposition tank are provided on the transfer device disposed above the electrodeposition tank, and the first and second hangers are provided. When the electric device case is conveyed while holding the bottom end and the end portion on the opening side of the electric device case by the second hanger, the electric device case is conveyed in a state where the electric device case is substantially oriented in the width direction of the electrodeposition tank. Therefore, the time required for electrodeposition can be ensured even if the length of the electrodeposition tank is made shorter than before. Further, the number of electrical equipment cases that can be immersed per unit length of the electrodeposition tank can be increased, so that work efficiency can be improved.

Further, as in the second method of the present invention described in claim 2, when the electric equipment case is suspended upside down in the pretreatment step and the cleaning step, drainage in the pretreatment and the cleaning step is facilitated. Can be.

Further, first and second conveyors are arranged above the electrodeposition tank at intervals in the width direction of the electrodeposition tank, and the electric equipment is provided by first and second hangers provided on both conveyors, respectively. By holding the both ends of the case and changing the height position of the lower ends of both hangers to swing the electric equipment case, even if the guide rail of each conveyor is greatly curved, each conveyor simply Since only a force is applied to the conveyor, no excessive force is applied to each conveyor. Therefore, the guide rails of the respective conveyors are largely curved, and the electric device can be largely swung, so that the accumulation of air or paint in the electric device case can be prevented.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 to 3 show examples of the configuration of an apparatus for carrying out the method of the present invention. FIG. 1 is a configuration diagram of a main part viewed from the side, and FIG. 2 is a configuration diagram shown in FIG. FIG. 3 is an explanatory view showing the posture of each electric device case viewed from the right side in FIG. 1, and FIG. 3 is a top view of a main part.

In these figures, reference numeral 1 denotes an electrodeposition tank having a predetermined length, and the bottom of the electrodeposition tank 1 has a first inclined portion 1a inclined downward from one end thereof to the other end thereof; A first flat portion 1b continuous with the lower end of the inclined portion, a second inclined portion 1c inclined upward from the other end of the first flat portion,
A second flat portion 1d having one end continuous with the upper end of the second flat portion, a third tilt portion 1e tilted obliquely downward from the other end of the second flat portion 1d, and a third flat portion 1e. It is composed of a third flat portion 1f continuous with the lower end. A water-soluble paint 2 is contained in the electrodeposition tank 1.

Reference numeral 3 denotes a first conveyor (main conveyor) arranged at a position higher than the electrodeposition tank 1, and the conveyor includes a guide rail 3A and a large number of trolleys 3B having rollers guided and moved by the guide rail. A chain (not shown) provided to connect between the trolleys. And a known chain conveyor having the following. The first conveyor is located at a position higher than the electrodeposition tank 1 and moves from a region (not shown) for performing a pretreatment process such as degreasing and water washing to a region (not shown) for performing a cleaning process through a region for performing an electrodeposition process. And both ends thereof are connected so as to form a closed loop as a whole.

Reference numeral 4 denotes a second conveyor (sub-conveyor), which comprises a chain conveyor having a structure in which a number of trolleys 4B (see FIG. 2) which are guided and moved by guide rails 4A are connected by a chain. ing. This second conveyor is arranged only in the illustrated area where the electrodeposition process is performed.

The second conveyor 4 is located at a position higher than the electrodeposition tank 1 and, as shown in FIG. And return section 4b
The first conveyor 3 and the conveyor 4a of the second conveyor 4 are arranged at a predetermined interval in the width direction of the electrodeposition tank 1.

A synchronizing device 5 for synchronizing the two conveyors is provided between the first conveyor 3 and the second conveyor 4, whereby the second conveyor 4 is driven to move at the same speed as the first conveyor. Is done.

A transfer hanger 7 is attached via a primary hanger 6 to a predetermined trolley 3B at a predetermined interval of the first conveyor 3, and a secondary hanger consisting of two chains is attached to the lower end of the transfer hanger 7. 8 are attached. The secondary hanger 8 constitutes a case holding portion, and the lower end of the secondary hanger is connected to an end 9a on the bottom side of the electric device case 9 as an object to be coated by an appropriate means. In the state where the electric equipment case 9 is held by only the secondary hanger of the first conveyor in this way, as shown in the right end of FIG. It will be in a state of being hung downward. In this example, the primary hanger 6, the transfer hanger 7, and the secondary hanger 8 constitute a first hanger.

In this example, as shown in FIG. 2, a large number of radiating fins 9A are provided on the side wall of the electric device case 9,
In FIG. 1, illustration of the radiation fin is omitted.

A carriage is provided on a predetermined trolley 4B of the second conveyor 4.
A sub-hanger 11 made of a chain or the like is mounted on the carriage 10. A hook-shaped hook 12 is attached to the lower end of the sub-hanger 11, and an inner end 9 b on the opening side of the electrical device case 9 whose bottom is held by the secondary hanger 8 provided on the first conveyor side is provided inside. The hook 12 is hooked to hold the end of the case on the opening side. The second hanger is constituted by the sub hanger 11 and the hook 12. This second hanger is connected with each first hanger of the first conveyor in the electrodeposition step.
Corresponding first to second hangers are provided so that the corresponding first and second hangers (the secondary hanger 8 and the hook 12) face each other in the width direction of the electrodeposition tank 1.

The carriage 10 has a plurality of sub-hanger holding grooves or holes 10a (indicated by + symbols in FIG. 2) arranged side by side at predetermined intervals in the lateral direction. The sub-hanger 11 is connected to the carriage 10 by hooking the hook in one of the grooves or holes. Groove or hole 10a for hooking sub hanger 11
The position of the sub-hanger 11 with respect to the secondary hanger 8 can be adjusted in accordance with the height of the electrical device case 9 by appropriately selecting.

Although not shown, a brush (current collector) is attached to the primary hanger 6 attached to the first conveyor, and when the primary hanger passes above the electrodeposition tank 1, the electrodeposition tank The brush comes into sliding contact with the power supply rail disposed along the area where the brushless motor 1 is provided. In the case of cation electrodeposition, the power supply rail is connected to the negative terminal of the DC power supply, and power is supplied from the power supply rail to the primary hanger 6 through a brush. Power is supplied to the electrical equipment case through the secondary hanger 8. In the case of cation electrodeposition, an electrode plate (not shown) connected to the positive output terminal of the DC power supply is provided in the electrodeposition bath 1.

In the case of anion electrodeposition, the power supply rail is connected to the positive output terminal of the DC power supply, and the electrode plate disposed in the electrodeposition tank is connected to the negative output terminal of the DC power supply.

The guide rails 3A of the first conveyor 3 and the guide rails 4A of the second conveyor 4 are curved so as to appropriately generate a height difference between the first and second hangers in each part of the area where the electrodeposition process is performed. Have been. In this embodiment, as shown in FIG. 1, the guide rail 3A of the first conveyor 3 is curved so as to be substantially along the inclined portion 1a, the flat portion 1b, and the inclined portion 1c at the bottom of the electrodeposition tank 1. , By this first conveyor,
An end on the bottom side of the electrical equipment case is transported substantially along the bottom of the electrodeposition tank 1.

Further, the guide rail 4A of the second conveyor 4 extends at a position higher than the guide rail 3A substantially along the guide rail 3A in a region corresponding to the inclined portion 1a and the flat portion 1b at the bottom of the electrodeposition bath, In a region corresponding to a portion behind the inclined portion 1c at the bottom of the tank, a position lower than the guide rail 3A is provided so as to extend substantially along the guide rail 3A. While the electric device case 9 is being conveyed in the electrodeposition tank, the position of the opening side end of the electric device case 9 is changed up and down by the second conveyor 4.

Next, the electrodeposition coating method of the present invention performed using the above-described apparatus will be described. In performing the electrodeposition coating of the electrical equipment case 9, first, a pretreatment step of performing a surface treatment such as degreasing and chemical conversion treatment on the surface of the electrical equipment case is performed. In this pretreatment step, the end of the electric equipment case 9 on the bottom side is held by a secondary hanger (first hanger) 8 provided on the first conveyor 3, and the electric equipment case is suspended upside down. In this state, each process is sequentially performed while transporting the electrical equipment case. After the chemical conversion treatment, the electrical equipment case is washed and drained. In this embodiment, since the pretreatment is performed in a state in which the electrical equipment case is suspended upside down, drainage can be easily and reliably performed.

The end of the electrical equipment case 9, which has been suspended upside down, on the opening side, where the electrical equipment case having completed the pretreatment step has been transported by the first conveyor 3 to a position before the electrodeposition tank 1. The electric device case 9 is hung from the first and second conveyors 3 and 4 with the electric device case 9 oriented in the width direction of the electrodeposition tank, as shown on the left end of FIG.

In the electrodeposition step, the posture of each electric equipment case 9 is changed as follows according to the height difference between the guide rails of the first and second conveyors 3 and 4. Before the electric device case is immersed in the paint in the electrodeposition tank, the opening side end of the electric device case is obliquely downwardly directed as shown in the left end of FIG. In this state, the electric equipment case is made to enter the paint, and as the electric equipment case is made to enter the paint, the position of the end on the opening side is raised with respect to the end on the bottom side, and the case is half immersed in the paint. Make it almost horizontal. After the electrical equipment case is completely immersed in the paint, the end on the opening side is pulled up, the opening is turned obliquely upward, and the air in the case is evacuated (case shown sixth from the left in FIG. 2). See). Then, the bottom end of the case 9 is pulled up, and when the case is pulled up from the electrodeposition bath, the hook 12 of the second hanger is automatically removed from the end on the opening side (right in FIG. 2). From the second case), the electrical equipment case is suspended upside down. When the electric equipment case is suspended upside down at the end of the electrodeposition step, excess paint can be easily removed from the electric equipment case.

The case 9 carried out of the electrodeposition tank is sent to the next post-processing step while being suspended upside down to wash and dry the painted electric device case. When the post-processing step is performed in a state where the electric device case is suspended upside down, drainage can be easily performed.

[Effects of the Invention] As described above, according to the present invention, the first and second hangers arranged at a predetermined distance in the width direction of the electrodeposition tank in the transport device disposed above the electrodeposition tank. With the first and second hangers holding the end on the bottom side and the end on the opening side of the electric device case, respectively, with the electric device case oriented substantially in the width direction of the electrodeposition tank. Therefore, even if the length of the electrodeposition bath is made shorter than before, the time required for electrodeposition can be secured, and there is an advantage that the installation area of the apparatus can be reduced.

Further, the number of electrical equipment cases that can be immersed per unit length of the electrodeposition tank can be increased, so that work efficiency can be improved.

In particular, according to the method described in claim 2, the electrical equipment case is suspended upside down in the pretreatment step and the cleaning step, so that drainage in the pretreatment step and the cleaning step can be facilitated.

Further, in the apparatus of the present invention, the first and second conveyors are arranged above the electrodeposition tank at intervals in the width direction of the electrodeposition tank, and the first and second conveyors respectively provided on both conveyors are arranged. 2
Both ends of the electrical equipment case are held by the hanger, and the electrical equipment case is rocked by changing the height position of the lower ends of both hangers, so even if the guide rail of each conveyor is greatly curved, No excessive force is applied to the conveyor. Therefore, the guide rail of each conveyor can be largely bent to swing the electric equipment case greatly, and it is possible to prevent the accumulation of air or paint in the electric equipment case.

[Brief description of the drawings]

1 to 3 schematically show an example of the configuration of an apparatus for carrying out the method of the present invention. FIG. 1 is a side view of a main part of the apparatus, and FIG. 2 is FIG. FIG. 3 is an explanatory view showing the posture of each electric device case shown in FIG. 1 viewed from the right in FIG. 1, and FIG. DESCRIPTION OF SYMBOLS 1 ... Electrodeposition tank, 2 ... Paint, 3 ... First conveyor, 3A ... Guide rail, 4 ... Second conveyor, 4A ... Guide rail, 6
... primary hanger, 7 ... transfer hanger, 8 ... secondary hanger,
9 ... Electrical equipment case, 10 ... Carriage, 11 ... Sub hanger, 12 ... Hook.

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Yukimitsu Yamamoto 2-1-1-11 Tagawa, Yodogawa-ku, Osaka-shi, Japan Daihen Co., Ltd. (72) Inventor Shigeaki Furukawa 1-18-18 Ohamacho, Amagasaki-shi, Hyogo No.Kyo Hanshin Paint Co., Ltd.

Claims (6)

(57) [Claims] An electric equipment case having a bottom with an open end is immersed in a paint in an electrodeposition tank having a predetermined length to apply a voltage between the electric equipment case and the electrodeposition tank. A method for coating an electrical equipment case, wherein a coating film is formed on the surface of the electrical equipment case while transporting the electrical equipment case along a longitudinal direction of the electrodeposition tank, A transport device extending along the longitudinal direction is provided, and a first end and an opening on the bottom side of the electrical equipment case are respectively provided by first and second hangers provided at a predetermined distance in the width direction of the electrodeposition bath. The electrical device case is suspended from the transport device while holding the side end, and the height position of the lower end portions of the first and second hangers is changed in the process of transporting the electrical device case by the transport device. Swings the electrical equipment case Electrodeposition coating method of an electric device case for causing. 2. A pre-treatment step of applying a surface treatment to an electric equipment case using a bottomed electric equipment case having one open end as an object to be coated, and then attaching the electric equipment case to a predetermined length. The surface of the electrical equipment case is transported along the longitudinal direction of the electrodeposition tank while applying a voltage between the electrical equipment case and the electrodeposition tank by immersing in the paint in the tank. Performing an electrodeposition step of forming a coating film, and then performing a post-processing step of washing and drying the electrical equipment case, in an electrodeposition coating method of an electrical equipment case, wherein the area where the pre-treatment step is performed and the area where the electrodeposition step is performed And a second conveyor is provided in a region where the electrodeposition process is performed, and a first conveyor and a second conveyor are provided in a region where the electrodeposition process is performed. At a predetermined distance from each other. The first and second conveyors are respectively disposed on the first and second conveyors at a predetermined distance in the width direction of the electrodeposition tank in the electrodeposition step.
In the pretreatment step, the first hanger holds the bottom end of the electrical equipment case and transports the electrical equipment case in a state where the electrical equipment case is hung upside down. The electrical equipment case is transported by suspending the electrical equipment case from the transport device while holding the bottom end and the opening end of the electrical equipment case by the first and second hangers, respectively. The electric device case is swung by changing the height position of the lower end of the first and second hangers in the process of performing, and when the electric device case is pulled up from the electrodeposition bath, The second hanger is detached from the electrical equipment case by making the bottom end higher than the opening end, thereby hanging the electrical equipment case upside down. Electrodeposition coating method of the equipment case. 3. When the electrical equipment case is swung in the electrodeposition step, the electrical equipment case is completely immersed in the paint, and the end on the opening side is inclined obliquely upward in the paint. 3. The method of claim 2, further comprising suspending the electrical device case upside down, with the end on the opening side gradually facing downward. 4. 4. A transfer device for transporting an electric equipment case along a longitudinal direction of the electrodeposition tank with an electrodeposition tank having a predetermined length and a bottomed electric equipment case having one open end as an object to be coated. And an electrodeposition coating apparatus for an electric equipment case, comprising: a voltage application unit for applying a voltage between the electric equipment case and the electrodeposition tank. First and second conveyors disposed above the electrodeposition tank at a distance, and the electrodeposition tank suspended from the first and second conveyors respectively by the first and second conveyors And first and second hangers transferred along the longitudinal direction of the electric device case, wherein the first and second hangers are respectively provided at the lower ends thereof at the bottom end and the opening end of the electrical equipment case. A case holding portion for holding the first and second portions, Wherein the height of the case holding portions of the first and second hangers is changed in a process of transferring the first and second hangers. Electrodeposition equipment. 5. The first and second conveyors each include:
The electrodeposition coating apparatus for an electrical equipment case according to claim 3, comprising a chain conveyor for moving a chain along a guide rail curved so that the height of each part changes along the longitudinal direction of the electrodeposition tank. . 6. The electrical equipment case according to claim 4, wherein the case holding portion of the second hanger comprises a hook-like hook that hooks and holds an end of the case on the opening side from the inside. Electrodeposition equipment.