JP2021143383A - Electrodeposition coating device, and electrodeposition coating method - Google Patents

Abstract

To provide an electrodeposition coating device capable of solving a problem that air entrapment or the like occurs in a transformer case, without making its structure complicated, and a method therefor.SOLUTION: A transformer case 7 is hung using a roller chain 15 hung over sprockets 15a, 15b. A float 24 adjusted to have a specified weight is attached to an opening 23 side of the transformer case 7. When the transformer case is completely submerged in the electrodeposition coating material 2, the position of the opening 23 is automatically elevated higher relative to the position of the bottom 22 of the transformer case using the buoyancy of the float 24 and the rotation of the sprockets 15a, 15b to eliminate air entrapment or the like in the transformer case 7.SELECTED DRAWING: Figure 4

Description

The present invention relates to an apparatus and a method for electrodeposition coating a transformer case.

Conventionally, when painting a case such as a transformer that requires corrosion resistance, it is degreased, washed thoroughly with water, and then suspended and transported at a required inclination angle by a conveyor device with a height difference. Moisture adhering to the case is drained during the transportation, and then the case is completely immersed in the electrodeposition paint in the electrodeposition tank to perform electrodeposition coating.

After the electrodeposition coating, the case is washed with water again, and then the coating is cured by heat-drying treatment, and a coating treatment having excellent weather resistance and corrosion resistance is applied.

Japanese Patent Application Laid-Open No. 61-210200 shows an example of such an electrodeposition coating method. As shown in FIG. 9, when the transformer case is electrodeposited, the case 101 is suspended from the conveyor device 102.

When suspending, the bottom of the case 101 is slightly lifted and tilted (inclination angle of about 20 °) and then suspended from the conveyor device 102. In this state, the transformer case is conveyed in the direction of the arrow shown in FIG.

The conveyor device 102 is tilted downward on the electrodeposition tank 103 in order to immerse the case 101 in the electrodeposition paint 104 in the electrodeposition tank 103, and the transformer case 101 is inside the electrodeposition paint 104 before the end point of the downward slope. Enter from the bottom of the case 101a.

After the transformer case 101 is completely immersed in the electrodeposition paint 104, the conveyor device 102 returns to the horizontal position, and the transformer case 101 again lifts the bottom 101a slightly and tilts the inside of the electrodeposition paint 104. Moving.

As a result, the outer surface of the transformer case 101 is painted, and the electrodeposition paint 104 flows into the inside of the transformer case 101, so that the inner surface of the case 101 can also be painted.

After that, the conveyor device 102 is inclined upward in order to pull up the electrodeposition-painted transformer case 101 from the electrodeposition tank 103, and pulls up the transformer case 101 from the electrodeposition paint 104. When the transformer case 101 is pulled up, the opening 101b side of the transformer case 101 is located below the bottom 101a, so that the electrodeposition paint 104 in the transformer case 101 is discharged from the inside of the case 101 into the electrodeposition tank 103. ..

The transformer case 101 pulled up from the electrodeposition coating 104 shifts to the horizontal state with the horizontal return of the conveyor device 102, and the electrodeposition coating is completed. The following problems of the electrodeposition coating method have been identified by Patent Document 1 below.

Japanese Patent Application Laid-Open No. 2-243798

That is, it has been pointed out that if the transformer case 101 is conveyed in the electrodeposition paint 104 in a state where the inclination angle is tight, air pools and the like may remain in the transformer case 101.

In order to solve this problem, in Patent Document 1, as shown in FIG. 10, the bottom 101a side of the transformer tank (corresponding to the transformer case) 101 is suspended by the first conveyor (main conveyor) 105, and the first conveyor (main conveyor) 105 is used. The opening 101b side of the transformer tank 101 is suspended by the conveyor (sub-conveyor) 106 of 2.

The second conveyor (sub-conveyor) 106 is arranged in the depth direction of the paper with respect to the first conveyor (main conveyor) 105, and the longitudinal direction of the transformer tank 101 is in the transport direction of the transformer tank 101. It is conveyed in the direction of the arrow in FIG. 10 in a vertical state, or in a flat state, in a horizontal state.

Further, in the first and second conveyors 105 and 106, similarly to the conveyor device 102 described with reference to FIG. 9, the transformer tank 101 is suspended and the transformer tank 101 is completely immersed in the electrodeposition paint 104 in the electrodeposition tank 103. Due to the immersion, it is composed of a downhill part, a horizontal part following it, and a subsequent uphill part, but the second conveyor 106 has a first downhill part and a horizontal part. The conveyor 105 is arranged higher than the conveyor 105, and the uphill portion is arranged lower than the first conveyor 105.

As a result, the transformer tank 101 is conveyed in the electrodeposition paint 104 in the direction of the arrow in FIG. 10 while swinging the bottom 101a and the opening 101b up and down, so that an air pool or the like remains in the transformer tank 101. It states that the problem can be solved.

However, when the method of FIG. 10 is adopted, two conveyor devices (first conveyor 105 and second conveyor 106) are required, the cost of the electrodeposition coating device rises, and the structure of the device becomes complicated. Therefore, the labor, time, and cost required for maintenance also increase.

Therefore, the present invention provides an electrodeposition coating apparatus and a method thereof that can solve the problem that air pools and paint pools remain in the transformer case without complicating the structure.

The invention according to claim 1 is a device for automatically electrodepositing a transformer case by immersing the transformer case conveyed by the conveyor device in an electrodeposition coating material, and a sprocket attached to a hanging metal fitting of the conveyor device. A roller chain is hung between them, the transformer case is hung by using the connecting jigs at both ends of the roller chain, and the transformer case is transformed into the connecting jig located on the opening side of the transformer tank. It is characterized in that the bottom of the vessel case is provided with a float having a weight that inclines at a balanced angle at a position higher than the opening.

The invention according to claim 2 is the electrodeposition coating apparatus according to claim 1, wherein the connecting jig located on the bottom side of the transformer case prevents an energization failure with the transformer case during electrodeposition coating. It has characteristics.

The invention according to claim 3 is characterized in that, in the electrodeposition coating apparatus according to any one of claims 1 or 2, the sprocket is provided with means for switching between rotation and restraint.

According to the fourth aspect of the present invention, the transformer is suspended by inclining both ends of a roller chain extending between sprockets so that the bottom of the transformer case is higher than the opening via a connecting jig. When the case is immersed in the electrodeposition coating, the float attached to the connecting jig raises the opening side of the transformer case to evacuate the air in the transformer tank.

According to the invention of claim 1, the opening of the transformer tank is tilted to a position higher than the bottom only by using the buoyancy of the electrodeposition paint by the float, and the air pool in the transformer tank is eliminated. Can be done.

According to the second aspect of the present invention, since it is possible to prevent poor energization between the connecting jig and the transformer tank, electrodeposition coating can be reliably performed when the transformer tank is immersed in the electrodeposition coating material. ..

According to the invention of claim 3, since the rotation of the sprocket can be stopped, the transformer case can be held in an upright state (a state in which it is easy to move to the next process).

According to the invention of claim 4, only one conveyor device is provided, and the transformer case can be oscillated in the electrodeposition paint to prevent air pools and paint pools from remaining.

It is a block diagram of the electrodeposition coating apparatus of this invention. It is a perspective view which shows the hanging method of a transformer case. It is a side view which shows the state which the transformer case is hung on the conveyor device. It is a side view which shows the state just before immersing a transformer case suspended in a conveyor device in electrodeposition paint. It is a side view which shows the state which the transformer case suspended in a conveyor device is completely immersed in electrodeposition paint. It is a side view which shows the state which pulled up the transformer case suspended from the conveyor device from electrodeposition paint. It is a side view which shows the state when the transformer case is taken down from a conveyor device. It is a side view which shows the other method of suspending a transformer case in the electrodeposition coating apparatus of this invention. It is a block diagram which shows the conventional electrodeposition coating apparatus. It is another block diagram of the conventional electrodeposition coating apparatus.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 7. FIG. 1 is a side view showing the configuration of the electrodeposition coating apparatus A of the present invention. In FIG. 1, reference numeral 1 denotes an electrodeposition tank having an insulating lining on the inner surface and filled with an electrodeposition paint 2. A conveyor device 3 and a power feeding rail 4 are installed above the electrodeposition tank 1.

The conveyor device 3 is composed of a front horizontal portion 3a, a downward slope portion 3b, a central horizontal portion 3c, an ascending slope portion 3d, and a rear stage horizontal portion 3e, and the power supply rail 4 is also arranged along approximately everywhere.

A hanging metal fitting 6 with an electric brush 5 that is in sliding contact with the power feeding rail 4 is attached to the conveyor device 3 so that the transformer case 7 can be conveyed in the direction of the arrow, and an electrode 8 is provided in the electrodeposition tank 1. Are arranged along the transport direction of the transformer case 7.

Power is supplied to the electrode 8 and the transformer case 7 from the output end of the DC power supply device 9 via the electric cables 10 and 11.

FIG. 2 specifically shows a method of suspending the transformer tank 7 from the hanging bracket 6. The hanging metal fitting 6 is composed of a pair of front and rear metal fitting plates 6a and 6b, respectively, and at the upper end portion between the metal fitting plates 6a and 6b, a transport wheel 13a that moves while rotating between the rails 12a and 12b of the conveyor device 3 , 13b are attached.

A curved chain 14 for connecting adjacent hanging metal fittings 6 is attached to the central portion of the hanging metal fitting 6 in the vertical direction, and even when the rails 12a and 12b of the conveyor device 3 are bent left and right in the top view. The structure is such that the transformer tank 7 can be conveyed. Further, between the metal fitting plates 6a and 6b at the lower end of the hanging metal fitting 6, sprockets 15a and 15b that rotate by hooking the roller chain (curved chain) 15 are attached via bearings (not shown).

Tip fittings 16a and 16b are attached to both ends of the roller chain 15, and the tip fittings 16a and 16b have a steel rod-shaped S-shaped hook 17 at the center and a hook 18a at the head, and the lower portion is provided. A chain jig 18 suspends the transformer case 7. The transformer case 7 is hung by the S-shaped hook 17 by hooking the lower hook of the S-shaped hook 17 on the hanging bolt 19 fixed to the transformer tank 7, and the transformer case 7 is hung by the chain jig 18. The lowering is performed by passing the chain portion of the chain jig 18 through the pillar metal fitting 20.

The method of suspending the transformer case 7 is not limited to this, and any method may be used such as using a jig that can be hooked on the hanging hardware 21, but the bottom 22 of the transformer case 7 may be suspended. Is inclined at a balanced angle (for example, + 20 °) and hung so that the position is higher than the opening 23.

Further, a float 24 is attached to the chain jig 18, and the float 24 has a weight that balances the opening 23 of the transformer case 7 at a position lower than the bottom 22. Reference numeral 25 denotes a lever for preventing the rotation of the sprocket 15b.

Next, a case where the transformer case 7 suspended from the hanging metal fitting 6 in this way is electrodeposited and painted will be described with reference to FIGS. 3 to 7. FIG. 3 is a front view showing a state in which the transformer case 7 is suspended from the conveyor device 3, and shows a state in which the transformer case 7 is located at the front horizontal portion 3a of the conveyor device 3 shown in FIG.

In this state, the transformer case 7 is located lower than the bottom portion 22 due to the weight of the float 24 attached to the chain jig 18.

The transformer case 7 is conveyed to the right in FIG. 3 by the conveyor device 3 while maintaining the inclination angle shown in FIG. 3, and moves to the downward inclination portion 3b shown in FIG. As shown in FIG. 4, the downward tilted portion 3b is tilted at a predetermined angle (for example, −20 °) by the conveyor device 3, so that the tilt angle in the state of FIG. 3 is offset and the transformer case 7 is substantially horizontal. The transformer case 7 is connected to the roller chain 15 via the S-shaped hook 17 and the chain jig 18, and the roller chain 15 is hooked on the sprockets 15a and 15b, so that the sprocket 15a , 15b rotates to maintain the same angle (eg, + 20 °) as in FIG.

The transformer case 7 enters the electrodeposition paint 2 of the electrodeposition tank 1 as shown in FIG. 1 while maintaining this angle.

Immediately after the case 7 has entered the electrodeposition paint 2, the opening 23 side of the transformer case 7 is lifted by loosening the lower part of the chain jig 18 due to the buoyancy of the electrodeposition paint 2. The buoyancy is reduced by the electrodeposition paint 2 flowing into the inside and being filled, and the float 24 shifts to a substantially horizontal state due to the influence of the weight of the float 24.

When the transformer case 7 is moved to the central horizontal portion 3c (see FIG. 1) of the conveyor device 3, the transformer case 7 is completely submerged in the electrodeposition paint 2. At this time, the transformer case 7 is subjected to the buoyancy of the float 24 attached to the chain jig 18, as shown in FIG.
The opening 23 is inclined so as to be higher than the bottom 22.

In this state, the air remaining in the transformer case 7 is evacuated from the opening 23 to the outside of the case 7, and the electrodeposition paint 2 can be evenly distributed in the transformer case 7.

After that, the transformer case 7 is conveyed in the electrodeposition paint 2 to the right in FIG. 5 by the conveyor device 3 while maintaining the posture shown in FIG. In the electrodeposition paint 2, from the anode side of the DC power supply device 9 shown in FIG. 1, the cable 10 → power supply rail 4 → electric brush 5 → hanging bracket 6 → roller chain 15 → S-shaped hook 17 → transformer case 7 → electrodeposition paint 2 → Electrode 20 → Cable 11 → A direct current flows through the negative electrode of the DC power supply device 9, and the electrodeposition paint 2 charged while the transformer case 7 is completely immersed and horizontally moves in the electrodeposition paint 2. , It adheres electrically to the inner and outer peripheral surfaces of the transformer case 7, and electrodeposition coating is applied.

At this time, since a coating film is formed on the chain portion of the chain jig 18 by electrodeposition coating, insulation is formed between the wheels forming the chain portion and does not contribute to energization during electrodeposition coating. This is because the coating film does not easily come off even when the wheels rub against each other.

On the other hand, an insulating coating film is formed on the S-shaped hook 17 and the hanging bolt 19 for hooking the S-shaped hook 17 by electrodeposition coating, but the coating film is good because the hooking holes of the S-shaped hook 17 and the ground bolt 19 are rubbed. It can be peeled off and prevent poor energization.

As a result, in the transformer case 7, a coating film is formed on the portion of the transformer case 7 in contact with the electrodeposition paint 2, including the inner surface of the heat radiation fin 26 shown in FIG. 2, with a substantially uniform thickness.

When the electrodeposition coating is completed, the transformer case 7 is inside the electrodeposition coating material 2 in a state where the bottom portion 22 is inclined again so as to be higher than the opening portion 23 by the ascending inclined portion 3d of the conveyor device 3 as shown in FIG. Is pulled up from.

Since the inclination angle is raised at the angle shown in FIG. 6 (for example, + 20 °), the electrodeposition paint 2 in the transformer case 7 is rapidly discharged from the case 7 into the electrodeposition tank 1 and into the case 7. No paint pools occur. At the timing when the electrodeposition paint 2 is completely discharged from the inside of the case 7, the transformer case 7 is conveyed to the rear horizontal portion 3e shown in FIG. 1 of the conveyor device 3.

As shown in FIG. 7, the transformer case 7 moved to the rear horizontal portion 3e is erected so that the opening 23 faces upward by human force against the weight of the float 24 attached to the chain jig 18. , Operate the lever 25 to prevent the rotation of the sprocket 15b.

In this state, even if the S-shaped hook 17 is removed from the transformer case 7, the transformer case 7 does not fall and the standing state can be maintained.

By keeping the transformer case 7 upright, it is possible to maintain a posture in which it is easy to hang it on the conveyor in the next process.

As described above, according to the electrodeposition coating device and the electrodeposition coating method of the present invention, it is possible to reliably prevent air accumulation in the transformer tank during electrodeposition coating without using two conveyor devices. can.

In addition, the opening rises when the transformer case enters the electrodeposition paint, then sinks due to the electrodeposition paint flowing into the transformer case, and the buoyancy of the float when the transformer case completely sinks. The transformer case can be swung in the electrodeposition paint through the lifting of the opening, and the inside of the transformer case can be painted evenly.

Further, since it is possible to prevent poor energization between the S-shaped hook and the transformer case, electrodeposition coating can be reliably performed.

In addition, since the transformer case after electrodeposition coating can be held in an upright state, the work of hanging it on the conveyor in the next process becomes easy.

The structure of the electrodeposition coating apparatus of the present invention is not limited to that described above, and the structure may be variously modified as long as the effects of the present invention described above can be realized. For example, as shown in FIG. 8, a connecting member 29 having sprockets 15a and 15b attached to hook pins 27 provided on a pair of metal fitting plates 6a and 6b at the lower end of the hanging metal fitting 6 by using a hook hook 28 is attached. The transformer case 7 may be suspended by hanging the roller chain 15 shown in FIG. 2 on the sprockets 15a and 15b attached to the connecting member 29.

The present invention can be used when painting a bottomed tubular case or the like.

1 Electroplated tank 2 Electroplated paint 3 Conveyor device 3a Front horizontal part 3b Downward tilting part 3c Central horizontal part 3d Uphill tilting part 3e Rear horizontal part 4 Power supply rail 5 Electric brush 6 Hanging jig 7 Transformer case 8 Electrode 9 DC power supply 10, 11 Cables 12a, 12b Rails 13a, 13b Conveyor wheels 14 Curved chains 15 Roller chains 15a, 15b Sprocket 16a, 16b Tip fittings 17 S-shaped hooks 18 Chain jigs 19 Hanging bolts 20 Pillar hardware 21 Hanging hardware 22 Bottom 23 Opening 24 Float 25 Lever 26 Cooling fin 27 Hook pin 28 Hook hook 29 Connecting member A Electrodeposition coating device

Claims (4)

In a device that automatically electrodeposits a transformer case by immersing the transformer case conveyed by the conveyor device in electrodeposition paint, a roller chain is hung between sprocket attached to the hanging metal fittings of the conveyor device. The bottom of the transformer case is the opening of the connecting jig located on the opening side of the transformer tank while suspending the transformer case by using the connecting jigs at both ends of the roller chain. An electrodeposition coating device characterized in that it is configured with a float having a weight that inclines at a balanced angle at a higher position. The electrodeposition coating apparatus according to claim 1, wherein the connecting jig located on the bottom side of the transformer case prevents an energization failure with the transformer case during electrodeposition coating. The electrodeposition coating apparatus according to claim 1, wherein the sprocket is provided with means for switching between rotation and restraint. The bottom of the transformer case is hung at both ends of the roller chain hung between the sprockets by inclining it so that it is higher than the opening, and the transformer case is immersed in the electrodeposition paint. The electrodeposition coating method is characterized in that the opening side of the transformer case is raised by a float attached to the connecting jig to remove air from the transformer case.

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