JP2933976B2 - Electrocoating equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an electrodeposition coating apparatus, particularly to a current collecting mechanism thereof.

(Prior art)

As shown in FIG. 5, the electrodeposition coating apparatus includes an electrodeposition tank 90 containing an electrodeposition liquid 901, a hanger 921 for suspending an object 912 in the electrodeposition liquid 901, and an electrodeposition liquid 901. Coating object 91
And a counter electrode 982 disposed opposite to the counter electrode 2.

The opposite electrode 982 is connected to a negative electrode (or positive electrode) of a power supply via a power supply lead wire 961. The object to be coated 912 is
It is connected to a positive electrode (or negative electrode) of a power supply via a hanger 921 and a trolley bar 931.

In addition, as shown in Fig. 6,
For example, four objects to be coated 911, 912, 913 and 914 are simultaneously immersed in 90 to perform a four-stage electrodeposition liquid treatment.

In other words, in FIG.
Reference numeral 12 denotes the first electrodeposition by the counter electrodes 982, 982, the object 913 is the second electrodeposition by the counter electrodes 983, 983, and the object 914 is the counter electrode 984,
983 shows the state of the third electrodeposition. The object 915 to which the four-stage electrodeposition process has been completed has been transferred to the next process apparatus 99 such as a washing station. Coating object 911-9 above
14 are suspended by hangers 921,922,923,924, respectively.

As shown in the figure, four power supply trolley bars 931, 932, 933 and 934 are arranged along the electrodeposition tank 90. The trolley bars 931 to 934 and the hanger 921
Between 924 and 924, current collectors 941 to 944 sliding on the trolley bar are provided. Also, in the figure, reference numerals 971 to 974 denote power supplies.

In the electrodeposition coating, as shown in FIG. 4, the object 912 is immersed in the electrodeposition tank 90 to perform the stepwise electrodeposition coating, and then the first water washing and the second water washing are performed. Washing with water,
It is sent to the next process equipment such as drying.

Further, at the time of the electrodeposition coating, the objects to be coated 911 to 914 in the electrodeposition tank 90 are sequentially conveyed forward, for example, after 0.5 minutes of energization in each stage. The transfer is performed by moving the hanger by moving means (not shown).

That is, in FIG.
911 is to be placed between the counter electrodes 982, 982 for the first electrodeposition.
912 is sequentially sent from the front to the space between the counter electrodes 983, 983 for the second electrodeposition. Then, the object to be coated 914 is transferred to the next process device 99 such as a washing station. Therefore, the hanger 924 which has suspended the object to be coated 914 is now empty and returned to the forefront in the electrodeposition tank 90 (in front of the object to be coated 911 in FIG. 6). Then, a new object is hung.

While the object to be coated is immersed in the electrodeposition liquid 901 in the electrodeposition tank 90, a current is constantly supplied to the object from the power supply via each trolley bar, current collector, and hanger. ing. Also, when transporting the object to be coated, the current collector slides on the trolley bar.

Next, a specific structure between the trolley bar, the current collector, and the hanger will be described with reference to FIG.

That is, the trolley bars 931 to 934 are provided along the electrodeposition tank 90 in which the charging liquid 901 is stored. The trolley bar 931
934 make two sets each. The hanger 921 has an object 911 hung at the distal end thereof, and has a current collector 941 below the vicinity of the proximal end. The current collector 941 has current collecting brushes 951 at both ends.

The current collecting brush 951 slides between a pair of trolley bars 931. A lead wire 961 is connected to the current collector 941. The tip of the lead wire 961 is electrically connected to the object 911 at the tip of the hanger 921.

Similarly, the hanger 922 is provided with a current collector 942 having a current collecting brush 952. Then, the current collector 942 causes the trolley bar 932 to slide. This means that hangers 923,92
4, The same applies between the collector 943,944 and the trolley bar 933,934.

[Problem to be solved]

However, the above prior art has the following problems.

That is, in the electrodeposition coating apparatus 9, as a current collecting mechanism for electrodeposition, trolley bars 931 to 934 disposed along the electrodeposition tank 90, and current collectors 941 to 9 that slide the trolley bars in the front-rear direction.
44 is used. Further, during the electrodeposition coating, when the object is transported as described above, the current collector provided on the hanger slides on the trolley bar.

And this trolley bar 931-934 and current collector 941-944
Since a high voltage is applied between the electrodes, a spark (spark) is generated at the contact portion at the time of the above-mentioned sliding, causing an electrical failure such as a voltage or a current drop.

As a result, it is difficult to generate a stable coating film on the substrate,
A step coating film is formed. In order to prevent sparking, it is conceivable to cut off the current of the trolley bar when the object to be coated is moved, that is, when the current collector is moved. In this case, the coating film is deposited in layers.

There are various types of electrodeposition liquids. When a coating film is formed on the surface of an electronic component mounting substrate (printed wiring board) by electrodeposition coating, a photosensitive resin is used for the coating film. Therefore, when a spark is generated at the time of electrodeposition coating, the coating material in the electrodeposition liquid is exposed to the light of the spark and hardens.
As a result, the coating film formed on the object to be coated has a rough surface, and the etching of the coating film in the subsequent process is not sharpened.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide an electrodeposition coating apparatus which does not generate a spark during electrodeposition coating and can form an excellent electrodeposition coating film.

[Solutions to solve the problem]

The present invention relates to an electrodeposition tank containing an electrodeposition liquid, a hanger for suspending the object to be coated in the electrodeposition liquid, a moving means for transporting the hanger along the electrodeposition tank, and In an electrodeposition coating apparatus comprising a power source for supplying an electric current through a hanger, a rail is provided along the electrodeposition tank, and a slider is slidably fitted to the rail. Has a holding portion for holding the power receiving plate of the hanger and is connected to a flexible power lead wire, and the hanger has a power receiving plate for receiving a current from the slider. It is in the coating equipment.

The most remarkable point in the present invention is that a rail disposed along the electrodeposition tank and a slider that slides on the rail are provided, and the slider has a holding portion for holding a power receiving plate of a hanger. And a flexible power supply lead wire is connected.

The rail serves as a guideway for moving the slider along the electrodeposition tank. The slider is fitted on the rail so that it can slide on the rail. Also,
The sandwiching portion serves to sandwich the power receiving plate of the hanger and supply current to the article to be coated through the hanger while the article to be coated is immersed in the electrodeposition liquid.

Therefore, when the object to be coated moves to the rear part of the electrodeposition tank, the holding part is configured to release the holding and to be separated from the power receiving plate of the hanger. The separated slider is returned to the front of the electrodeposition tank.

The sandwiching portion has a structure in which, for example, a power receiving plate is sandwiched from both sides thereof. In addition, when the power receiving plate of the hanger descends, the pinching portion clamps the power receiving plate, and when the slider moves to the rear portion of the electrodeposition tank, detects the position and releases the clamping. Are preferably connected.

The return mechanism of the slider is provided, for example, with a spring coil interposed between the slider and the front of the electrodeposition tank, and when the slider releases the sandwiching of the power receiving plate at the rear of the electrodeposition tank, the spring is returned. It is also possible to adopt a configuration in which the coil automatically returns by the tensile force of the coil (third
See figure). There is also a configuration in which the return is made by a wire or the like.

The power supply lead wire is flexible so that the slider can move smoothly from the front part to the rear part of the electrodeposition tank.

(Operation)

In the present invention, the object immersed in the electrodeposition solution is
It is transported inside the electrodeposition tank while being hung by a hanger. During the transfer, the power receiving plate of the hanger is held by the holding portion of the slider. Therefore, the slider slides on the rail as the hanger moves. Power is supplied to the object through a power supply lead wire, a slider, a power receiving plate, and a hanger.

Next, when the object reaches the rear part of the electrodeposition tank, the holding part releases the holding of the power receiving plate of the hanger. Then, the object to be coated is sent to the next step together with the hanger. Also,
The slider is returned to the front of the electrodeposition tank on the rail.

Then, the holding portion of the slider holds the power receiving plate of the hanger newly sent to the front portion of the electrodeposition tank. In this way, the slider reciprocates on the rail between the front part and the rear part along the electrodeposition tank.

Thus, in the present invention, the power supply to the object to be coated is
The operation is performed through a slider that sandwiches a power receiving plate of a hanger, and there is no sliding portion between the power supply lead wire and the slider. That is, the current collector sliding on the trolley bar is not used as in the related art. Therefore, no spark is generated.

(Effect)

Therefore, according to the present invention, it is possible to provide an electrodeposition coating apparatus capable of forming an excellent electrodeposition coating film without generating spark.

〔Example〕

An electrodeposition coating apparatus according to an embodiment of the present invention will be described with reference to FIGS.

As shown in FIG. 1, the present apparatus comprises an electrodeposition tank 90 containing an electrodeposition liquid, a hanger 3 for suspending an object 911 in the electrodeposition liquid, and the hanger 3 in the electrodeposition tank 90. It comprises a moving means 6 for transporting the object 911 along the same, and a power source (not shown) for supplying a current to the object 911 through the hanger 3. A rail 1 is provided along the electrodeposition tank 90, and a slider 2 is slidably fitted on the rail. The slider 2 has a sandwiching portion 21 for sandwiching the power receiving plate 4 of the hanger 1 and is connected to a flexible power lead wire 28 having a spiral shape.

The rail 1 is provided along the electrodeposition tank 90 from the front to the rear thereof. As shown in FIGS. 2 and 3, the slider includes a main body 23 fitted to the rail 1, a holding portion 21 provided on the main body 24,
The terminal part 25 is attached to the side surface of the main body part 24 with screws 25. A power supply lead wire 28 is connected to the terminal portion 25.
The main body 24 has, on both lower sides thereof, convex portions 245 that fit into the guide grooves 11 of the rail 1. As shown in FIG. 3, the side surface of the main body 24 has a screw groove 241 for screwing the screw 251 therein.

Further, as shown in FIG. 3, the holding portion 21 has opposed holding plates 211 and 212. The holding plates 211 and 212 are connected to an electromagnetic device (not shown) provided in the slider 2 so that they can approach and separate from each other. Further, a spring coil 29 is interposed between the main body 24 and the end plate 15 at the front part of the rail 1.

The electromagnetic device has a controller that moves the holding plates 211 and 212 toward and away from each other. That is, when the slider 2 is located in front of the electrodeposition tank and the power receiving plate 4 of the hanger is located between the holding plates 211 and 212, the two plates are brought close to each other to hold the power receiving plate. On the other hand, when the slider 2 is located behind the electrodeposition tank, the two plates are separated from each other to release the sandwiching of the power receiving plate.

The hanger 3 is, as shown in FIGS. 1 and 2,
It has a back plate 31 and a rod portion 32 provided laterally on the back plate 31. Further, the rod portion 32 has a suspension rod 33 that suspends the article 911 at the tip 321. A power receiving plate 44 is fixed to the lower side of the rod 32 by welding 40. In addition, a carbon cloth 41 is adhered below the power receiving plate 4 to ensure electrical connection with the holding portion 21.

Next, as shown in FIG. 1, a rear plate 311 is provided on the back surface of the back plate 31 of the hanger 3. A support rod 5 that can move up and down is provided along the rail 1 behind the back plate 31. The support rod 5 has a support plate 51 at appropriate intervals. The rear plate 511 of the hanger 3 is placed on the support plate 51. Also, on each support plate 51, each back 311 of the other hanger is placed.

The support rod 5 is connected to a vertically moving motor 55 via a suspension wire 56. Also, the transport device 6
It has a motor 61 for moving in the left-right direction, and pulleys 61 and 65 coaxially connected to the motor 61. Pulleys 63, 66 are coaxially disposed in front of the electrodeposition tank 90 (to the right in FIG. 1), and between the pulleys 63, 66 and the pulleys 62, 65 are provided for left and right movement. Of the chain 621,651. A suspending wire 67 is provided between the chains 621 and 651, and the suspending wire 67 is attached to the back plate 31 of the hanger 3.
Are integrally connected.

 Next, the function and effect will be described.

First, the object to be coated 911 is suspended by the hanger 3 and immersed in the electrodeposition liquid in the electrodeposition tank 90. Then, as shown in FIGS. 2 and 3, when the hanger 3 descends and the power receiving plate 4 is positioned between the holding plates 211 and 212 of the holding portion 21 of the slider, the controller detects this. To activate the electromagnetic device. Then, the sandwiching plates 211 and 212 sandwich the power receiving plate 4.

Thereafter, power for electrodeposition is supplied to the object to be coated 911 through the power supply lead wire 28, the slider 2, the power receiving plate 4, and the hanger 3. After power is supplied for a predetermined time, the hanger 3 is moved by the transfer device 6 as described later. Therefore, the article to be coated 911 is transported one step backward. With this conveyance, the slider 2 holding the power receiving plate 4 of the hanger 3 moves rearward along the rail 1.

Then, when the object to be coated 911 reaches the rear part (left side in FIGS. 1 to 3) of the electrodeposition tank 90 through the electrodeposition processing of each stage, that is, the processing in the electrodeposition tank 9 is performed. When finished, the position is detected by the controller. And
The electromagnetic device of the slider 2 is operated to release the clamping of the clamping plate 2111212 (FIG. 3). The opened hanger 3
It is transported to the next step with the article to be coated 911.

On the other hand, when the slider 2 reaches the rear of the electrodeposition tank together with the object 911, the spring coil 29 connected to the slider 2 is in the most extended state as shown by the two-dot chain line in FIG. Therefore, when the holding portion 21 releases the holding of the power receiving plate 4, the slider 2 is automatically returned to the front of the electrodeposition tank (to the right in FIG. 3) by the spring coil 29. The returned slider 2 sandwiches the newly sent hanger again as described above.

When the object 911 is transported, the vertical movement motor 55 in FIG. 1 is operated to lower the support rod 5 suspended by the wire 56, and the support plate on which the rear plate 311 of the hanger is placed. Lower 51. As a result, the support plate 51
The hanger 3 supported by the above is suspended by the upper and lower left-right movement chain 621 by the wire 67.

Then, the motor 61 for moving in the left-right direction is operated to move the chains 621, 651 via the pulleys 62, 63, 65, 66. As a result, the hanger 3 connected to the chains 621 and 651 moves. And the hanger 3 has its back plate 31
Is stopped when it reaches the position of the support plate 51 next to the support rod 5. Therefore, the upper and lower motor 55 is operated to
The support rod 5 is lifted through the support plate 51, and the rear plate 311 of the hanger 3 is slightly lifted by the support plate 51. And
The hanger 3 is supported in this state except during transport.

As described above, in the electrodeposition coating apparatus of the present example, power was supplied to the object by sandwiching the power receiving plate 4 of the hanger 3. The operation is performed via the slider 2, and there is no sliding portion between the power supply lead wire and the slider. Therefore, as described above, the trolley bar and the current collector slide,
There are no sparks.

Further, since no spark is generated, when a photosensitive resin paint is used for the electrodeposition liquid, there is no fear of curing. In addition, there is no soot generated by the spark, and the soot does not drop during electrodeposition. Therefore, an excellent electrodeposition liquid coating film can be formed. Further, the slider 2 can be automatically returned along the rail 1 after releasing the sandwiching of the power receiving plate 4.

[Brief description of the drawings]

1 to 3 show an electrodeposition coating apparatus according to an embodiment, FIG. 1 is an overall explanatory view, FIG. 2 is a perspective view of a main part near a slider and a power receiving plate, and FIG. 4 to 7 show a conventional electrodeposition coating apparatus.
5 is a side view, FIG. 6 is a plan view thereof, and FIG. 7 is a partially cutaway perspective view of a trolley bar and a hanger. 1 ... rail, 2 ... slider, 21 ... clamping part, 211, 212 ... clamping plate, 28 ... power lead wire, 29 ... spring coil, 3 ... hanger, 31 ... back plate, 4 ... ... Receiving plate, 55 ... Motor vertically, 6 ... Transfer device, 61 ... Motor for moving left and right, 90 ... Electrodeposition tank, 911-914 ... Coated object, 921-924 ... Hanger,

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) C25D 21/00 C25D 13/22 303 C25D 17/08 C25D 13/00 304 C25D 17/06

Claims (1)

(57) [Claims] 1. An electrodeposition tank containing an electrodeposition liquid, a hanger for suspending an object to be coated in the electrodeposition liquid, moving means for transporting the hanger along the electrodeposition tank, and the object to be coated. An electrodeposition coating apparatus comprising a power supply for supplying a current through a hanger, a rail is provided along the electrodeposition tank, and a slider is slidably fitted to the rail. The slider has a holding portion for holding the power receiving plate of the hanger and is connected to a flexible power lead wire, and the hanger has a power receiving plate for receiving a current from the slider. Electrodeposition equipment.