JPH02285095A - Device for electrodeposition-coating electrical appliance case - Google Patents

Abstract

PURPOSE:To prevent the damage of the case due to an overload on a conveyor and the vibration of a coating film by providing a device for supplying a gas into the case in the device in which a bottomed case with one end opened is conveyed from one end to the other end of an electrodeposition tank and inverted. CONSTITUTION:A bottomed electrical appliance case 5 with one end opened is conveyed in the longitudinal direction from one end to the other end of an electrodeposition tank 2 by conveyors 3 and 4. When the case 5 is discharged from the tank 2, the case 5 is inverted, and the opening is turned downward in a paint 1. A gas supply pipeline 10 is provided on the outlet side of the tank 2. When the inversion is started, a motor-operated valve 14 is closed on receipt of the emitted signal, a motor-driven valve 12 is opened, and a gas is supplied to the tank 2 via the pipeline 10 and injected from a nozzle 11. The gas is introduced into the inverted case 5 from its opening, and the paint in the case 5 is replaced with the gas and gradually discharged. The paint in the case is discharged almost completely, when the case 5 is pulled up from the paint 1 and the opening leaves the surface of the paint 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an electrodeposition coating apparatus used for coating cases of electrical equipment such as transformers and switches.

[Prior art] In the electrodeposition coating method, after surface treatment such as degreasing and chemical conversion treatment is applied to the object to be coated, the object to be coated is placed in an electrodeposition tank and while being transported, the object to be coated and the tank are separated. A coating film is formed by applying a DC voltage between the two. The object to be coated on which the coating film has been formed is taken out from the electrodeposition tank and sent to a post-treatment process in which it is washed, dried, etc.

When applying electrodeposition coating to a bottomed electrical equipment case with an open end, it is necessary to prevent air accumulation and paint accumulation in the case when the electrical equipment case is immersed in an electrodeposition tank. When air pockets occur, paint cannot enter into the air pockets, making it impossible to form a paint film. Furthermore, if paint buildup occurs, a good coating film with a uniform thickness cannot be formed. Air pools and paint pools are particularly likely to occur when electrodepositing is applied to an electrical equipment case having a complicated shape, such as a transformer case having heat dissipation fins.

Therefore, in order to solve the above problem, the present inventor first changed the height of the bottom side and the height of the opening side of the electrical equipment case while transporting the case facing the width direction of the electrodeposition bath. We proposed a method in which the case is swung within the electrodeposition bath by rotating the electrodeposition chamber.

When carrying out this method, for example, as shown in FIGS. 3 and 4, first and second conveying devices 3 and 4 are placed at a distance in the width direction of the electrodeposition tank 2 containing the paint 1. will be established. The conveyance devices 3 and 4 each include guide rails 3A and 4A extending along the longitudinal direction of the electrodeposition bath, first and second carriages 3B and 4B that travel guided by these guide rails, and first and second carriages 3B and 4B, respectively. second carriage 3
The lower end of the first carriage is coupled to the end of the electrical equipment case 5 on the bottom 5a side.

A hook 4D is attached to the lower end of the second hanger 4C, and by hooking this hook 4D into the opening 5b of the electrical equipment case 5 from the inside, the electrical equipment case 5 is suspended as shown.

Figure 3 is a view of the device viewed from a direction perpendicular to the longitudinal direction of the electrodeposition tank, and Figure 4 is a view of each electrical equipment case shown in Figure 3 viewed from the right side of the figure. FIG.

The bottom of the electrodeposition tank 2 includes a first sloped part 2a that slopes downward from one end (inlet side) to the other end (outlet side), and a first sloped part 2a that is continuous with the lower end of the first sloped part 2a. 1 flat part 2b
, a second inclined part 2C which is inclined upward from the other end of the first flat part 2b, a second flat part 2d whose one end is continuous with the upper end of the second inclined part, and a second inclined part 2C which is inclined upward from the other end of the first flat part 2b; It consists of a third inclined part 2e that is inclined obliquely downward from the other end of the flat part 2d, and a third flat part 2f that is continuous with the lower end of the third inclined part 2e. The flat part 2d is provided so as to be located slightly below the upper edge of the electrodeposition tank, and the slope part 2e and the flat part 2
A bubble removal tank 2g is formed by the portion f.

The first guide rail 3A extends along a trajectory that roughly follows the bottom of the electrodeposition tank, and the second guide rail 4A has a height difference from the first guide rail at each part in the length direction of the electrodeposition tank. It is set in. Therefore, during transportation, the height difference between the first and second guide rails causes the height positions of the lower ends of the first and second hangers to change, causing the electrical equipment case to swing.

Near the exit of the electrodeposition tank, the end of the electrical equipment case 5 on the bottom 5a side is pulled up to a higher position than the end on the opening 5b side. As a result, the second hanger 4C is automatically removed from the electrical equipment case 5 in the paint, as seen in the electrical equipment case shown second from the right end in FIG. Hanged upside down. In this state, the electrical equipment case 5 is pulled up and carried out from the electrodeposition tank.

[Problems to be Solved by the Invention] As described above, when carrying out an electrical equipment case from an electrodeposition tank while hanging upside down, the case must be held until the opening of the electrical equipment case emerges from the liquid level of the paint. There is paint inside, and the weight of this paint puts additional weight on the conveyor. Therefore, it is necessary to set the mechanical strength of the conveying device in consideration of this extra weight, which poses a problem of increasing the cost of the device.

Also, if the opening of the electrical equipment case comes out above the paint level,
The electrical equipment case vibrates because the paint inside the case is suddenly discharged and its weight suddenly decreases, and this vibration causes the electrical equipment case to dance, causing damage to the paint film near the contact area between the hanger and the electrical equipment case. There was fear.

The purpose of the present invention is to prevent unnecessary burden from being placed on the conveyance device when carrying out the electrical equipment case from the electrodeposition tank, and also to prevent damage to the coating film by suppressing the vibration of the electrical equipment case. An object of the present invention is to provide an electrocoating device for electrical equipment cases.

[Means for Solving the Problems] The present invention provides an electrodeposition tank having a predetermined length and a bottomed electrical equipment case with one end open as objects to be coated. In an electrocoating apparatus equipped with a conveying device that transports the electrical equipment along the longitudinal direction from one end to the other, the electrical equipment case is hung upside down with the opening facing downward in the paint from the electrocoating bath. This prevents the weight of the paint inside the electrical equipment case from being added to the conveyance device during transport.

Therefore, in the present invention, a gas supply device is provided for supplying gas into the electrical equipment case suspended upside down at the other end of the electrodeposition tank.

[Function] When the gas supply device is provided as described above, the paint in the electrical equipment case suspended upside down is replaced with gas and discharged. Therefore, when the opening of the electrical equipment case emerges from the liquid surface of the paint, most of the paint inside the case can be removed, and it is possible to prevent unnecessary weight from being added to the conveying device.

In addition, the paint inside the electrical equipment case is gradually discharged and no sudden changes in weight occur, which prevents the case from vibrating and dancing.

[Examples] Examples of the present invention will be described in detail below with reference to the accompanying drawings.

Figures 1 and 2 show the main parts of an embodiment of the present invention, and in these figures, 2 is an electrodeposition tank containing paint 1, and 3 is an electrodeposition bath containing paint 1.
and 4 are conveying devices, which are constructed similarly to those shown in FIGS. 3 and 4.

In this embodiment, a gas supply pipe 10 is arranged on the inclined part 2c on the outlet side of the electrodeposition tank 2.

This gas supply pipe 10 has a bent portion 10a in a meandering pattern or a spiral pattern, and this bent portion 10a is located below the opening of the electrical equipment case 5 that is suspended upside down. It is arranged so that A large number of nozzles 11 are attached at predetermined intervals to the bent portion 10a of the piping 10, pointing toward the opening 5b of the electrical equipment case suspended upside down, and the end portion of the bent portion 10a is closed. ing. The pipe 1o is led out along the side wall of the electrodeposition bath 2 and connected to the outlet of a blower 13 via an electric valve 12. An exhaust pipe 15 is also connected to the outlet of the blower 13 via an electric valve 14.

A photoelectric detector consisting of a light emitter 16 and a light receiver 17 facing each other with an interval in the width direction of the electrodeposition tank is provided above near the end on the exit side of the electrodeposition tank 2. When the hanger 3C moves to the vicinity of the position where the upside-down hanging of the electrical equipment case starts, the hanger 3C passes between the light emitter 16 and the light receiver 17, and the upside-down hanging of the electrical equipment case starts from the light receiver 17. It is designed to generate a detection signal indicating that the

A pump 1 is installed on the flat part 2f that constitutes the bottom of the bubble removal tank 2g.
8 is connected, and this pump pumps the paint 2 into the bubble removal tank 2g.
By returning the paint 1 to the entrance side end of the electrodeposition bath 2,
is designed to circulate. This allows the paint to flow from the inlet side end of the electrodeposition tank 2 toward the bubble removal tank 2g, so that the paint foam generated in the electrodeposition tank is collected into the bubble removal tank 2g. can be removed.

The photoelectric detector is connected to the control circuit of the electric valves L2 and 14, and when the photodetector 17 generates a signal, the electric valve 14
is closed, and the electric valve 12 is opened for a certain period of time set by a timer.

Next, the operation of the above embodiment will be explained. The blower 13 is constantly operated, and the electric valve 14 is open and the electric valve 12 is closed until the electric equipment case 5 is transported to a position where it is hung upside down.

In this state, all the gas (usually air) sent out from the blower 13 is exhausted from the exhaust pipe 15, and no gas is supplied into the paint 1.

When the electrical equipment case 5 is transported to the exit side of the electrodeposition tank 2 and begins to be hung upside down, the light receiver 17 generates a signal. In response to this signal, the electric valve 14 closes and the electric valve 12 opens, so that gas is supplied into the electrodeposition bath 2 through the gas supply pipe 10, and gas is ejected from the nozzle 11. The gas ejected from the nozzle 11 enters the inside of the electrical equipment case 5, which is hung upside down, through the opening. Therefore, the paint inside the electrical equipment case 5 that is hung upside down is replaced with gas and gradually discharged, and when the paint 1 is pulled up by the force of the electrical equipment case and the liquid level of the paint 1 comes out of the opening, the case is The paint inside is almost completely drained out.

When gas is supplied as described above, bubbles are generated in the paint, but the bubbles are generated near the exit of the electrodeposition tank, and the formation of the coating film on the electrical equipment case has already been completed near the exit of the electrodeposition tank. Therefore, it does not affect the quality of the paint film.

In the above embodiment, a photoelectric detector is used as a means for detecting that the electrical equipment case has been transported to a position where it is hung upside down, but other detection means such as a limit switch may also be used.

In the above embodiment, an electric valve is used as the valve for controlling gas supply, but a solenoid valve may also be used.

[Effects of the Invention] As described above, according to the present invention, a gas supply device that supplies gas into an electrical equipment case that is hung upside down at the other end of the electrodeposition tank and whose opening is directed downward in the paint. Since we have installed a device,
Paint inside an electrical equipment case suspended upside down can be replaced with gas and gradually discharged. Therefore, when the opening of the electrical equipment case emerges from the liquid level of the paint, most of the paint inside the case can be removed, which has the advantage of preventing excess weight from being added to the conveying device.

Furthermore, since the paint inside the electrical equipment case is gradually discharged to prevent sudden changes in weight, it is possible to prevent the case from dancing due to vibration and damaging the paint film.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing the configuration of the main part of an embodiment of the present invention as viewed from a direction perpendicular to the longitudinal direction of the electrodeposition tank, and FIG. FIG. 3 is a block diagram showing the configuration of an electrodeposition coating apparatus to which the present invention can be applied, viewed from a direction perpendicular to the longitudinal direction of the electrodeposition tank. FIG. 4 is an explanatory diagram showing the suspended state of each electrical equipment case shown in FIG. 3, viewed from the right side of FIG. 3; DESCRIPTION OF SYMBOLS 1...Paint, 2...Electrodeposition tank, 3, 4...Transfer device, 5...Electrical equipment case, 10...Gas supply piping,
11... Nozzle, 12.14... Electric valve, 15
···Exhaust pipe. Figure 1

Claims (1)

[Claims] An electrodeposition tank having a predetermined length and a bottomed electrical equipment case with one end open are used as objects to be coated, and the electrical equipment case is longitudinally moved from one end side of the electrodeposition tank to the other end. a conveyance device for conveying the electric device case along the direction, and the conveyance device hangs the electric device case upside down and directs the opening of the case downward in the paint when the electric device case is carried out from the electrodeposition bath. In an electrocoating apparatus for an electrical equipment case, which is configured to be placed in a state where the electrocoating tank is placed in 1. An electrodeposition coating device for electrical equipment cases, characterized in that it is equipped with a gas supply device that supplies gas.