JPH05186895A - Intermittent electrodeposition coating device - Google Patents

Abstract

(57) [Abstract] [Purpose] Suppressing unnecessary inertial fluctuations of the transfer hanger 5 for transferring an object to be coated in an intermittent type cationic electrodeposition coating device, and preventing the electrodeposition coating liquid from dripping on the power supply surface. thing. [Structure] The transport hanger 5 is suspended by a front chain 44 and a rear chain 46 of a traveling truck 4. The traveling truck 4 has a conical engagement hole 65, and the transport hanger 5 has an engagement pin 68. When the transport hanger 5 moves up and approaches the traveling track 4, the engaging pin 68 of the transport hanger 5 is inserted into and engaged with the engaging hole 65 of the traveling track 4. In the inserted state, the lateral movement of the engagement pin 68 is restricted by the inner wall surface of the engagement hole 65, and unnecessary inertial swing of the hanger 5 is suppressed. When the hanger 5 rises, the power feeding swing arm that feeds power to the hanger 5 swings upward and retracts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intermittent electrodeposition coating apparatus. This coating apparatus can be applied to, for example, cationic electrodeposition coating.

[0002]

2. Description of the Related Art Conventionally, there are a continuous type and an intermittent type as an electrodeposition coating apparatus. The continuous method is a method in which a long continuous continuous tank in which an electrodeposition coating solution is stored is used, and an object to be coated is continuously immersed in the continuous tank to perform electrodeposition coating. The intermittent type uses a group of tanks in which a pretreatment tank that stores the pretreatment liquid, an electrodeposition coating tank that stores the electrodeposition coating liquid, and a posttreatment tank that stores the posttreatment liquid are individually arranged in series, and the coating is performed. This is a method of intermittently immersing objects in each tank individually.

By the way, in the above-mentioned intermittent method, Japanese Unexamined Patent Publication No. 62-62
As disclosed in Japanese Patent Laid-Open No. 54097, there is known a device for intermittently transporting an object to be coated in a horizontal direction along a tank by a transport conveyor and raising and lowering the tank in synchronization with the transport conveyor. Further, as disclosed in JP-A-1-119695, the pretreatment tank, the water washing tank, and the electrodeposition coating tank are moved while rocking the basket while the object to be coated is put in the mesh basket. There is known an apparatus for obtaining a uniform electrodeposition coating film free from electrodeposition spots.

Further, as a work transfer device for electrodeposition coating, as disclosed in Japanese Utility Model Publication No. 55-103271,
A structure is known in which rocking imparting means is arranged in the movement path of a trolley conveyor that suspends a workpiece supporting jig through a hanger, and the rocking imparting means imparts rocking to the workpiece supporting jig. Has been.

[0005]

By the way, in the intermittent method,
After transferring a transport conveyor or trolley conveyor, it must stop immediately or start after stopping. However, when it stops or starts, the conveyor and trolley conveyors are affected by the inertial force, etc.
It is the main cause of rocking in the lateral direction. In this case, the object to be coated conveyed to the conveyer conveyor or the trolley conveyor also swings, and if the amount of swinging is large, it hinders traveling.

The present invention has been made in view of the above situation, and is advantageous in that the engaging action of the engaging pin is effective in preventing the swinging of the transfer hanger and hence the object to be coated due to the stop or start. The first purpose is to retract the power feeding surface of the power feeding portion to the second position, which is advantageous in avoiding that the electrodeposition coating liquid dripping from the transport hanger falls onto the power feeding surface of the power feeding portion. An object of the present invention is to provide an intermittent electrocoating apparatus having the purpose of 2.

[0007]

The intermittent electrodeposition coating apparatus of the present invention comprises a pretreatment tank for storing the pretreatment liquid, an electrodeposition coating tank for storing the electrocoating liquid, and a posttreatment for storing the posttreatment liquid. A group of tanks in which tanks are individually arranged in series, a guide rail that is installed above each tank along each tank that constitutes the tank group, a traveling track that can travel on the guide rail, and a hoisting track. It consists of a transport hanger that is hung as much as possible and has a transport part that transports the object to be coated.One of the running track and the transport hanger has a conical engagement hole whose inner wall surface becomes larger toward the other. The other of the traveling track and the transport hanger is vertically projected at a position facing the engagement hole, and the engagement pin is inserted into the engagement hole when the transport hanger is lifted upward and approaches the travel track. The electroplating tank of the tank group is A first position for feeding the conveying hanger immersed in electrodeposition coating solution of a second retracted from the first position
And a power feeding portion having a power feeding surface provided so as to be positionally adjustable.

The electrodeposition coating tank has a power feeding portion having a power feeding surface. The power feeding surface of the power feeding unit is provided at a first position for feeding power to the transfer hanger immersed in the electrodeposition coating liquid in the electrodeposition coating tank and a second position retracted from the first position, respectively, so that the position can be adjusted. Has been. As a mode of adjusting the position to the first position and the second position, a mode of swinging the power feeding surface, a mode of moving the power feeding surface forward and backward, or the like can be adopted.

[0009]

In the present invention, the drive section is driven while the article to be coated is engaged with the transfer section of the transfer hanger. Then, the traveling truck travels while being guided by the guide rail. As a result, the transport hanger suspended from the traveling truck travels along each tank forming the tank group.

Then, the transfer hanger moves up and down. Here, when the transport hanger is lowered, the object to be coated which is being transported in the transport part of the transport hanger is immersed in the liquid in the tank, while when the transport hanger is lifted, the material being transported in the transport part of the transport hanger is transferred. The coating is removed from the bath liquor.
By the way, in the present invention, the object to be coated is swung in the liquid in order to ensure the contact between the liquid in the tank and the object to be coated, or the object to be coated is shaken outside the tank to drain the liquid. There is something to do. In this case, the transport hanger is swung. However, when the transfer hanger is unnecessarily rocking when going to the next tank, there arises a problem that the transfer hanger collides with the adjacent transfer hanger or the wall of the tank. In this respect, in the present invention, when the transport hanger is raised, the engagement pin is inserted into the engagement hole, thereby avoiding unnecessary swinging of the transport hanger.

Further, when the transport hanger is lifted from the electrodeposition coating liquid and rises, the electrodeposition coating liquid dripping from the transport hanger drops on the power feeding surface of the power feeding section, and the electrodeposition coating liquid solidifies as it is to form an electric insulating film, There is a risk of impairing the power feeding capability of the power feeding surface. In this respect, according to the present invention, by retracting the power feeding surface of the power feeding portion to the second position, it is possible to prevent the electrodeposition coating liquid dripping from the transport hanger from dropping onto the power feeding surface of the power feeding portion.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. (Structure and operation of the embodiment) This coating apparatus is a cationic electrodeposition coating apparatus that applies a negative voltage to an object to be coated and deposits a positively polarized paint on the surface of the object to be coated. In this apparatus, as shown in FIG. 9, the pretreatment tank 10 of the tank group 1 includes a preliminary degreasing tank 11 that stores a preliminary degreasing liquid, a degreasing tank 12 that stores the degreasing liquid, and a first washing tank that stores water. 13, a second washing tank 14 for storing water, and a third washing tank 15 for storing water
And a fourth washing tank 16 that stores water. The electrodeposition coating tank 18 stores a cationic electrodeposition coating liquid. Similarly, as shown in FIG. 9, the post-treatment tank 20 includes a first washing tank 21 in which water is stored, a second washing tank 22 in which water is stored,
It is composed of a third washing tank 23 that stores water. A guide rail 3 is installed above each tank along each tank constituting the tank group 1.

As shown in FIGS. 1 to 3, the traveling truck 4 is
A vehicle body 42 having guide rollers 40, 41, a drive motor 43 as a drive unit arranged in the vehicle body 42 for traveling the vehicle body 42, two front chains 44 arranged in a front portion 42e of the vehicle body 42, and a front chain Lifting unit 4 before lifting 44
5, two rear chains 46 arranged on the rear part 42f of the vehicle body 42, and a rear elevating part 47 for elevating the rear chain 46.
And a control panel 48. Front elevator 45 and rear elevator 4
7 is a chain block. Here, the guide roller 40 shown in FIG. 1 can travel on the rail portion 30 of the guide rail 3, and the guide roller 41 can travel on the rail portion 31.

The transport hanger 5 is made of steel and is composed of an upper frame 50 and a vertical frame 52. As shown in FIG. 2, the lifting bracket 5 is attached to the mounting bracket 50a on the front portion 42e side of the upper frame 50 of the transfer hanger 5 via the pin 50b.
0c, and as shown in FIG. 3, the mounting bracket 50f on the rear portion 42f side of the upper frame 50 of the transport hanger 5 is equipped with a lifting tool 50i via a pin 50h. Here, as can be understood from FIG. 3, the front chain 44 of the traveling truck 4 is connected to the lifting tool 50c,
The rear chain 46 of the traveling truck 4 is connected to the suspension 50i. As a result, the four corners of the transport hanger 5 are suspended by the two front chains 44 and the two rear chains 46.

As shown in FIG. 2, a bracket 58 is provided at the center of the upper frame 50 of the transfer hanger 5, and the electrode rod 5 having a circular cross section protruding laterally from the bracket 58.
Equipped with 9. Further, on the lower portion of the vertical frame 52 of the transport hanger 5, a mounting portion 53 for mounting the storage box W1 in which the article W to be coated is mounted is formed so as to project in the horizontal direction. The storage box W1 is formed of a mesh plate.

In this embodiment, as shown in FIG. 2, the lower frame 41h of the traveling truck 4 is provided with two brackets 64 having engaging holes 65. The engagement hole 65 has a conical shape and has a diameter increasing toward the lower side and a conical surface 65a that opens downward, and the same diameter surface 6 that is continuous with the conical surface 65a.
And 5c. Further, on the upper frame 50 of the transport hanger 5, two upward facing engagement pins 68 are provided via a bracket 69 at a position facing the engagement hole 65 of the traveling truck 4. The upper end 68a of the engagement pin 68 has a small diameter.

In this embodiment, as shown in FIGS. 6 to 8, the column portion 18a of the electrodeposition coating tank 18 is equipped with a shock absorbing spring 70 having a coil spring.
A power feeding swing arm 72 is pivotally supported on the column portion 18a via a lateral shaft 71 so as to swing vertically. And
An air cylinder 73 is attached to the bracket 18b of the pillar portion 18a of the electrodeposition coating tank 18 via a pin 73a, and a rod 74 of the cylinder 73 is attached via a floating joint 75 for shock absorption as shown in FIG. It is connected to the other end 72j of the power feeding swing arm 72. A storage recess 72a having a V-shaped cross section is formed as a power supply surface at the tip of the power supply swing arm 72. When the cylinder 73 contracts, the tip of the power feeding swing arm 72 moves upward about the shaft 71, that is, the arrow Y shown in FIG.
It swings in one direction and retracts to the second position.

On the other hand, when the cylinder 73 is extended in this state, the tip of the power feeding swing arm 72 is moved to the shaft 71.
7 and swings in the direction of the arrow Y2 shown in FIG. 7 to be in the lateral direction, is received by the receiving portion 18e of the column portion 18a, and is in the first position. The power feeding swing arm 72 is made of steel, which is a conductive material, is electrically connected to the power supply for electrodeposition coating, and serves as a negative electrode.

In this embodiment, as can be understood from FIG. 3, a storage box W1 made of a mesh plate containing a large number of forged objects W to be coated is used, and the storage box W1 is mounted on the transport hanger 5. The drive motor 43 is driven while being placed on the placing portion 53. Then, the traveling truck 4 is guided by the guide rail 3 and the traveling truck 4 travels. As a result, the transport hanger 5 suspended on the traveling truck 4 is moved to the tank group 1
It runs along each tank that composes. Then, when the front elevating section 45 and the rear elevating section 47 of the traveling truck 4 are activated and the front chain 44 and the rear chain 46 are descended, the transport hanger 5 descends in a normal state, that is, in a non-inclined state.

Then, when the transport hanger 5 is lowered, the article W to be coated in the storage box W1 placed on the placing portion 53 of the transport hanger 5 is immersed in the liquid in each tank. Further, as the transport hanger 5 rises, the article W to be coated in the storage box W1 placed on the placing portion 53 of the transport hanger 5 is taken out from the liquid in the tank. Such raising and lowering is performed for each tank, and preliminary degreasing treatment, degreasing treatment, water washing treatment, electrodeposition coating treatment, and water washing treatment are sequentially performed.

However, in this embodiment, as shown in FIGS.
The state where the electrode rod 59 of the transport hanger 5 is received in the storage recess 72 a of the power feeding swing arm 72 of the electrodeposition coating tank 18 is shown. As shown in FIGS. 7 and 8, the cylinder 73 is driven to cause the rod 74 to contract, and the power feeding swing arm 72 swings sideways around the shaft 71. In this state, the traveling track 4 is in a fixed position. The transport hanger 5 further descends and is immersed in the electrodeposition coating liquid in the electrodeposition coating tank 18. In this state, the electrode rod 59 of the transport hanger 5 is inserted into the storage recess 72.
It is received by a, and both make electrical contact. As a result, the object W to be coated in the storage box W1 placed on the transport hanger 5 has a negative voltage. In this state, the positively polarized paint particles in the electrodeposition coating tank 18 are laminated on the surface of the object W to be coated, and an electrodeposition coating film is formed on the surface of the object W to be coated.

The impact when the electrode rod 59 is received in the storage recess 72a is subject to the other end 72j of the power feeding swing arm 72.
Hits the spring 70, and the shock is alleviated. By the way, in this embodiment, as shown in FIG. 2, when the transport hanger 5 rises and approaches the traveling truck 4, the transport hanger 5 is moved.
The engaging pin 68 of is inserted into the engaging hole 65 of the traveling track 4 and engaged therewith. In the inserted state, the lateral movement of the engagement pin 68 is restricted by the inner wall surface of the same-diameter hole 65c of the engagement hole 65. As a result, unnecessary swinging of the transport hanger 5 is prevented.

Now, the case of swinging the transport hanger 5 will be described. That is, in order to ensure the contact between the liquid in the tank and the object W to be coated, the object W to be coated and the storage box W1 are swung in the liquid in the tank. Further, the liquid W adhering to the object W to be coated, the water to be drained, and the object W to be coated and the storage box W1 are swung outside the tank for draining. In this case, the procedure is as follows.
That is, as can be understood from FIG. 3, in a state where the traveling truck 4 is stopped, the front elevating portion 45 of the traveling truck 4 is operated, and the front chain 44 is moved up and down while the rear chain 46 is left as it is. Then, the transport hanger 5 is swung. Alternatively, the rear elevating part 47 of the traveling truck 4 is operated to lower the rear chain 46 while keeping the front chain 44 as it is, thereby swinging the transport hanger 5. Also, leave the rear chain 46 as it is,
The front chain 44 may be lowered. Here, the swing outside the bath is shown as a region D in FIG. 3, and the swing inside the electrodeposition coating bath 18 is shown as a region E in FIG. As shown in the area E of FIG. 3, when the transfer hanger 5 swings in the electrodeposition coating tank 18, the electrode rod 59 of the transfer hanger 5 moves to the feed swing arm 72 of the tank 18 as shown in FIG. Since the carrier hanger 5 is mounted and held in the storage recess 72a, the transport hanger 5 is not
It swings around. In addition, when swinging, the claws of the placing portion 53 of the transport hanger 5 are claws W11 of the storage box W1.
, The storage box W1 does not drop.

In this embodiment, the transfer hanger 5 swings,
The raising and lowering was performed as follows. That is, in the preliminary degreasing step in the preliminary degreasing tank 11, the vertical movement within the tank is performed twice and the shaking on the tank at ± 30 ° is performed once. Motion once, and shaking on the tank of ± 30 ° once, and the first washing tank 13
In the water washing process, shaking on the tank of ± 30 ° is performed once, and
In the second water washing step in the second water washing tank 14, rocking of ± 30 ° in the tank is performed once, and rocking of ± 30 ° in the tank is performed once, and the third water washing step in the third water washing tank 15 is performed. Then ± 30 °
In the fourth washing step in the fourth washing tank 16, the shaking on the tank of ± 30 ° was performed three times. In the electrodeposition coating process in the electrodeposition coating tank 18,
The shaking in the tank of ± 30 ° was performed once, and the shaking on the tank of ± 30 ° was performed once. In the first washing step in the first washing tank 21 which is the post-treatment step, the shaking on the tank of ± 30 ° is performed once.
Further, in the second washing process in the second washing tank 22, ± 30
The shaking on the tank was performed once at a temperature of ± 30 °, and the shaking on the tank at ± 30 ° was performed once in the third washing step in the third washing tank. The ± of ± 30 ° means that the descending chain in the traveling direction is +, and the descending chain is −. The object W to be coated in the storage box W1 coated as described above is baked in the baking process after the drying process. (Effects of Embodiment) As described above, in the present embodiment, the traveling truck 4 has the conical engagement hole 65 whose diameter increases toward the lower side and which opens downward. Then, as shown in FIG. 2, when the transport hanger 5 is lifted upward and approaches the travel track 4, a total of two engagement pins 68 of the transport hanger 5 are inserted into the engagement holes 65, respectively. In particular, since the conical surface 65a of the engaging hole 65 has a conical shape, the engaging pin 68 can be easily inserted into the engaging hole 65 from any direction. In this inserted state, the lateral movement of the engagement pin 68 is restricted by the engagement hole 65. Further, the upward movement of the transport hanger 5 is also restricted. As a result, the front and rear of the transport hanger 5 are regulated, and unnecessary inertial swing of the transport hanger 5 is prevented. Therefore, it is possible to effectively prevent the inertial swing of the transport hanger 5 during traveling of the traveling truck, particularly during sudden start or sudden stop.

In the present embodiment, when swinging the transport hanger 5, the front chain 44 is raised to lift the front part of the transport hanger 5, while the rear chain 46 is lowered to hold the rear part of the transport hanger 5. If lowered, transport hanger 5
The central area of the swing of the carriage approaches the central area C5 (shown in FIG. 4) of the transport hanger 5. Therefore, the swing radius of the transport hanger 5 can be made smaller, which is advantageous in saving space. In particular, when the transport hanger 5 is swung in the tank, the inner volume of the tank can be made smaller and the volume of the liquid stored in the tank can be made smaller.

By the way, the transport hanger 5 is the electrodeposition coating tank 1.
When lifted from the electrodeposition coating liquid 8 and lifted, the electrodeposition coating liquid attached to the transport hanger 5 drops and falls on the power feeding surface of the storage recess 72a of the power feeding swing arm 72. And
The electrodeposition coating liquid may solidify on the power feeding surface to form an electric insulating film, which may impair the power feeding capability of the power feeding surface. In this regard, in this embodiment, as shown by the alternate long and short dash line in FIG. 7, if the storage recess 72a of the power feeding swing arm 72 is swung in the arrow Y1 direction and retracted to the second position, the dimensions shown in FIG. E It will be far away. Therefore, it is possible to prevent the electrodeposition coating liquid dripping from the transport hanger 5 from dropping into the storage recess 72a. In particular, if the engaging pin 68 is inserted into the engaging hole 65 and the unnecessary swinging of the transport hanger 5 is avoided, the electrodeposition coating liquid dripping from the transport hanger 5 will further drop into the storage recess 72a. Avoided.

Further, in a state where the electrode rod 59 of the transfer hanger 5 is placed in the storage recess 72a of the power feeding swing arm 72,
When the transport hanger 5 swings, the electrode rod 59 swings, so that the storage recess 72a of the electrode rod 59 and the power feeding swing arm 72 is moved.
There is a risk that the electrical contact with the power supply surface of will be insufficient.
In this respect, in this embodiment, the other end portion 72 of the power feeding swing arm 72 is used.
Since j is biased by the spring force of the sprinkle 70, even if the transport hanger 5 swings, good electrical contact is ensured between the electrode rod 59 and the power feeding surface of the storage recess 72a of the power feeding swing arm 72. To be done.

In addition, in this embodiment, there are two front chains 44 and two rear chains 46, and the transport hanger 5 is
Since the four corners are suspended, the transport hanger 5 is less likely to swing.

[0029]

According to the intermittent electrodeposition coating apparatus of the present invention,
When the transport hanger is raised, one of the transport hanger and the engagement pin of the traveling track is inserted into and engaged with the other engagement hole. In particular, since the inner peripheral wall surface of the engagement hole has a conical shape, the engagement pin can be easily inserted into the engagement hole from any direction. In this inserted state, the lateral movement of the engagement pin is restricted by the inner wall surface of the engagement hole. Furthermore, excessive lifting of the transport hanger is also restricted. This prevents unnecessary swinging of the transport hanger. Therefore, it is possible to effectively prevent the inertial swing of the transport hanger during a sudden start or a sudden stop during traveling of the traveling truck.

Further, according to the intermittent electrodeposition coating apparatus of the present invention, when the power feeding surface of the power feeding portion is retracted to the second position, the electrodeposition coating liquid dripping from the transfer hanger is applied to the power feeding surface of the power feeding portion. Since it is prevented from falling, the problem that an electric insulating film is formed on the power feeding surface is avoided. In particular, if the engaging pin is inserted into the engaging hole to avoid unnecessary swinging of the transport hanger,
It is further prevented that the electrodeposition coating liquid dripping from the transport hanger falls on the power feeding surface of the power feeding unit.

[Brief description of drawings]

FIG. 1 is a front view of a main part.

FIG. 2 is a front view of a traveling truck.

FIG. 3 is a side view of the transport hanger swinging.

FIG. 4 is a side view of the transport hanger.

FIG. 5 is a front view of a transport hanger.

FIG. 6 is a front view of a state in which a transport hanger is immersed in an electrodeposition coating solution in an electrodeposition coating tank.

FIG. 7 is a partially enlarged front view showing a state in which an electrode rod of a transport hanger is received by a storage recess.

FIG. 8 is a partially enlarged side view of a state in which an electrode rod of a transport hanger is received by a storage recess.

FIG. 9 is a side view of a tank group.

[Explanation of symbols]

In the figure, 1 is a tank group, 18 is an electrodeposition coating tank, 3 is a guide rail,
4 is a traveling truck, 44 is a front chain, 46 is a rear chain, 45 is a front lifting unit, 47 is a rear lifting unit, 5 is a transport hanger, 59 is an electrode rod, 65 is an engagement hole, 65a is a conical surface, 6
Reference numeral 8 is an engaging pin, 72 is a power feeding swing arm, and 72a is a storage recess.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoshi Onuma 1 Wano Wari, Arao-cho, Tokai-shi, Aichi Aichi Steel Co., Ltd. (72) Haruo Kadoi 1 Wano-wari, Arao-cho, Tokai-shi, Aichi Aichi Steel (72) Inventor Tatsuyoshi Kobayashi 1 Wano Wari, Arao-cho, Tokai-shi, Aichi Aichi Steel Co., Ltd. (72) Inventor Masakatsu Matsumoto 1 Wano-wari, Arao-cho, Tokai-shi, Aichi Steel Co., Ltd. ( 72) Inventor Hiroshi Takahashi 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Co., Ltd. (72) Inventor Toshiaki Mori 1-25-2 Honjindori, Nakamura-ku, Nagoya 1 Daiwa Paint Sales Co., Ltd.

Claims (1)

[Claims] 1. A tank group in which a pretreatment tank for storing a pretreatment liquid, an electrodeposition coating tank for storing an electrodeposition coating liquid, and a posttreatment tank for storing a posttreatment liquid are individually arranged in series, and the tanks. Guide rails that are installed above each of the tanks that form the group, traveling tracks that can travel on the guide rails, and suspensions that can be lifted up and down on the traveling tracks to convey objects to be coated. A transport hanger having a transporting section for transporting the transport track and the transport hanger, wherein one of the travel track and the transport hanger has a conical engagement hole whose inner wall surface increases in diameter toward the other. The other has an engaging pin that is vertically projected at a position facing the engaging hole, and is inserted into the engaging hole when the transport hanger is lifted upward and approaches the traveling track, The electrodeposition coating tank of the tank group is an electrodeposition coating liquid in the electrodeposition coating tank. Intermittently characterized by having a power feeding portion provided with power feeding surfaces that are respectively positionally adjustable at a first position for feeding power to the transfer hanger immersed in the substrate and a second position retracted from the first position Type electrodeposition coating equipment.