JP7096039B2 - Electrodeposition coating equipment - Google Patents

Description

The present invention relates to an electrodeposition coating apparatus.

Electrodeposition coating, in which the work as an object to be coated and the counter electrode are immersed in the electrodeposition paint stored in the electrodeposition tank and the work is painted by applying a DC voltage between them, has a complicated shape surface. Since a coating film can be uniformly formed on the workpiece to be held, it is used in a wide variety of industrial fields.

In order to efficiently perform electrodeposition coating, workpieces of different materials and shapes are placed in one electrodeposition tank, and one electrodeposition tank is used to electrodeposit multiple types of workpieces with different coating conditions. It is also painted. In this case, it is necessary to set the time (energization time) for applying a voltage to the work according to the coating thickness and material of each of the various works, that is, according to the work. When setting the energization time according to the work, generally, the energization time is changed at the timing when the work is switched. In this case, once the electrodeposition tank is filled with an empty hanger that does not hold the work, the energization time is changed in that state, and then a new work to which the changed energization time is applied is put into the electrodeposition tank. Will let you. Since the setup accompanying such a change in the energization time is performed by flowing the empty hanger into the electrodeposition tank, time is wasted by the amount of the empty hanger flowing, and the production efficiency is deteriorated.

In order to prevent the above-mentioned deterioration of production efficiency, an electrodeposition coating device having various measures has been proposed. For example, in Patent Document 1, a plurality of energizing bars having lengths corresponding to each of a plurality of types of workpieces having different energizing times are prepared, and by using the energizing bars corresponding to the workpieces, the energizing time in one electrodeposition tank. Disclosed is an electrodeposition coating apparatus capable of electrodeposition coating of a plurality of different types of workpieces. Further, Patent Document 2 discloses an electrodeposition coating apparatus including a first-stage energizing bar installed in an entry tank area and constantly energized, and a second-stage energization bar installed in a completely submerged area and an exit tank area. The second-stage energization bar is divided into a plurality of energization regions, and the application and stop of the voltage are independently controlled in each of the divided energization regions. Then, the application and stop of the voltage in the plurality of energization regions of the second stage energization bar are controlled according to the energization pattern preset for the work to be put in the tank, so that the energization conditions corresponding to each work can be obtained. Electrodeposition coating is applied to each work.

Japanese Unexamined Patent Publication No. 2009-185337 Japanese Unexamined Patent Publication No. 2008-024983

(Problems to be solved by the invention)
According to the electrodeposition coating apparatus described in Patent Document 1, a plurality of energizing bars having different lengths are installed in parallel along the height direction, which is disadvantageous in terms of space. Further, even if an attempt is made to modify an existing facility to use the technique described in Patent Document 1, it cannot be modified if there is a restriction in the height direction. Further, it is necessary to improve the current collector provided on the work holding hanger for holding the work and electrically connected to the energizing bar, which incurs the cost required for the improvement.

Further, according to the electrodeposition coating apparatus described in Patent Document 2, different rectifiers must be connected to each of the two energizing bars (first-stage energizing bar and second-stage energizing bar) that require different voltage controls. It doesn't become. That is, two rectifiers are required, which increases the equipment cost. Further, since the voltage application state in the energized region through which the work is passing is changed, sparks are generated due to contact disconnection when the voltage application state changes, and the sparks adversely affect the coating film quality of the work.

As described above, conventionally, when electrodeposition coating corresponding to a wide variety of workpieces is performed in one electrodeposition tank, there is a concern that various problems may occur. Therefore, the present invention is an electrodeposition coating apparatus capable of electrodeposition coating of a plurality of types of workpieces in one electrodeposition tank without adversely affecting the coating film quality of the workpiece and without significantly increasing the cost. The purpose is to provide.

(Means to solve problems)
The electrodeposition coating apparatus according to the present invention includes an electrodeposition tank (1) in which electrodeposition paint is stored, a transport path (2) extended in an upper region of the electrodeposition tank, an energization bar (5), and the like. It includes a work holding hanger (3), a work identification hanger (4), a counter electrode (6) arranged in an electrodeposition tank, a voltage applying device (7), and a control device (8).

The energizing bar is extended along the extending direction of the transport path, and is composed of a plurality of energizing pieces (51,521,531) divided along the extending direction. The work holding hanger is attached to the transport path while holding the work, and while moving in the extending direction of the transport path, it sequentially contacts a plurality of energized pieces and puts the held work into the electrodeposition tank. The work identification hanger has a work identification member for identifying the work, and is attached to the transport path in a state where the dummy work is held at the head position of the work holding hanger that holds the work identified by the work identification member. While moving in the extending direction of the transport path, the plurality of energized pieces are sequentially contacted, and the held dummy work is put into the electrodeposition tank. The voltage application device applies a predetermined DC voltage between the plurality of energizing pieces and the counter electrode. The control device is provided between the plurality of energizing pieces and the voltage applying device, and controls the application state of the voltage to the plurality of energizing pieces. Then, the control device determines the voltage to the energized piece whose voltage application state should be changed among the plurality of energized pieces when the work held by the work holding hanger following the work identification hanger enters the electrodeposition tank. By changing the application state of the work at the time when the work identification hanger is in contact with the work, the application state of the voltage to the plurality of energized pieces is controlled based on the energization time set for the work to be put in the tank.

According to the present invention, a work identification hanger provided with a work identification member for identifying the work is located at the head position of the work holding hanger on which the work to be put into the electrodeposition tank is held. Then, when the work held by the work holding hanger following the work identification hanger enters the electrodeposition tank, the control device includes a plurality of control devices provided with the energizing bar based on the energizing time set for the work to be entered. The state of application of voltage to the energized piece is controlled. Therefore, it is possible to control the state of application of voltage to a plurality of energized pieces according to the type of work, and thereby electrodeposition coating can be performed on each work with an optimum energization time. Therefore, a plurality of types of workpieces can be electrodeposited and coated using one electrodeposition tank.

In addition, when it becomes necessary to change the voltage application state to a plurality of energized pieces in order to set an appropriate energization time for the work when the work held by the work holding hanger following the work identification hanger is put into the tank. There is. In such a case, in the present invention, when the work identification hanger located at the head of the work to be put in the tank is in contact with the energized piece whose voltage application state should be changed, the voltage applied state of the energized piece is applied. Is changed. Therefore, the spark generated by the contact disconnection when the voltage applied state to the energized piece changes adversely affects the coating film formed on the dummy work held by the work identification hanger in contact with the energized piece. However, it does not affect the coating film formed on the work held on the work holding hanger following the work identification hanger. Therefore, the coating film quality of the work can be maintained.

As described above, according to the present invention, it is possible to provide an electrodeposition coating apparatus capable of electrodeposition coating of a plurality of types of workpieces in one electrodeposition tank without adversely affecting the coating film quality of the workpieces. can. Further, according to the present invention, the electrodeposition coating apparatus can be configured without using a plurality of energizing bars. Therefore, by modifying the existing equipment, a plurality of types of workpieces can be combined into one electric wire without increasing the cost so much. Electrodeposition coating can be performed in the landing tank.

In the present invention, in the control device, the energization time set for the work held by the work holding hanger following the work identification hanger is set for the immediately preceding work held by the work holding hanger located immediately before the work identification hanger. If it is shorter than the energization time, when the work held by the work holding hanger following the work identification hanger enters the electrodeposition tank, a voltage is applied based on the energizing time set for the immediately preceding work. Based on the energization time set for the work to be entered, by stopping the application of voltage to the energized pieces that do not need to be applied to the energized pieces when the work identification hanger is in contact. It is advisable to control the state of application of voltage to a plurality of energized pieces. According to this, if the energization time of the work newly placed in the electrodeposition tank is shorter than the energization time of the immediately preceding work placed in the electrodeposition tank at the present time, the extra energized energizing piece (voltage). The application of voltage to the energized piece), which does not need to be applied, is stopped when the work identification hanger is in contact with the energized piece. Thereby, the energization time can be appropriately changed without deteriorating the quality of the coating film formed on the work held by the work holding hanger following the work identification hanger.

In the present invention, in the control device, the energization time set for the work held by the work holding hanger following the work identification hanger is set for the immediately preceding work held by the work holding hanger located immediately before the work identification hanger. If it is longer than the energization time, when the work held by the work holding hanger following the work identification hanger enters the electrodeposition tank, a voltage is applied based on the energizing time set for the immediately preceding work. By starting the application of voltage to the energized piece to which the voltage should be applied among the unenergized energized pieces at the time of contact of the work identification hanger, a plurality of energized pieces based on the energization time set for the work to be entered. It is advisable to control the state of application of voltage to. According to this, when the energization time of the work newly placed in the electrodeposition tank is longer than the energization time of the immediately preceding work placed in the electrodeposition tank at the present time, among the energized pieces to which no voltage is applied. A voltage is applied to the energized piece to which the voltage should be applied when the work identification hanger is in contact with the energized piece. Thereby, the energization time can be appropriately changed without deteriorating the quality of the coating film formed on the work held by the work holding hanger following the work identification hanger.

In this case, the control device applies a voltage to the energized piece in the energized section corresponding to the energized time set for the work held by the work holding hanger following the work identification hanger among the plurality of energized pieces, and energizes. It is preferable to control the application state of the voltage to a plurality of energized pieces so that the application of the voltage to the energized pieces outside the section is stopped.

Further , the electrodeposition coating apparatus according to the present invention may include a counting means (105) for counting the number of works to be put into the electrodeposition tank after the detecting means detects the passage of the work identification member. Then, in the control device, the voltage is applied to the energized piece that the work identification hanger contacts before the number of works counted by the counting means reaches the target count number preset as the number corresponding to the energization time set for the work. It is preferable to control the application state of the voltage to a plurality of energized pieces so that the application of the voltage to the energized pieces to which the work identification hanger comes into contact after being applied and reaching the target count number is stopped. The energization time can be expressed by the number of works counted by the counting means. Therefore, by switching the application state of the voltage to the energized piece when the number of workpieces counted by the counting means reaches the target count number, electrodeposition coating with an appropriate energization time for the newly charged workpiece is performed. Can be applied to the work.

Further, the energized piece may have an opposite side (A1) facing the adjacent energized piece. The facing side (A1) may be inclined with respect to the moving direction so as to overlap the facing side (B1) of the adjacent energized pieces in the direction perpendicular to the moving direction of the work holding hanger. According to this, when the work holding hanger passes through the boundary of the adjacent energized pieces, it always comes into contact with either one of the adjacent energized pieces. Therefore, since the work holding hanger is not in contact with any of the energizing pieces while moving on the boundary of the adjacent energizing pieces, the application of the voltage to the work holding hanger is suddenly stopped (or to the work holding hanger). It is possible to prevent the application of voltage from being suddenly started) and sparks, which deteriorate the coating quality of the work held on the work holding hanger.

FIG. 1 is a schematic view of an electrodeposition coating apparatus according to the present embodiment. FIG. 2 is a schematic perspective view of the work holding hanger. FIG. 3 is a schematic perspective view of the work identification hanger. FIG. 4 is a diagram showing the transport rail and the energizing bar of FIG. FIG. 5 is a schematic view showing a boundary portion of adjacent energized pieces. FIG. 6 is a schematic view of the transport rail, the hanger attached to the transport rail, and the energizing bar as viewed from above. FIG. 7 is a schematic plan view of a work identification member corresponding to each of a plurality of types of works. FIG. 8 is a schematic side view of a work identification member corresponding to each of a plurality of types of works as viewed from the downstream side in the moving direction. FIG. 9 is a schematic view of the positional relationship between the work identification member and the work identification unit as viewed from the downstream side in the moving direction. FIG. 10 is a schematic view of the positional relationship between each work identification member provided on the work identification hanger and each limit switch as viewed from the downstream side in the moving direction. FIG. 11 is a flowchart showing a flow of switching control of a voltage applied state to the energized bar executed by the control device. FIG. 12A is a diagram showing an example of a change in the voltage applied state of the energized bar when the switching control of the voltage applied state of the energized bar is executed. FIG. 12B is a diagram showing an example of a change in the voltage applied state of the energized bar when the switching control of the voltage applied state of the energized bar is executed, following FIG. 12A. FIG. 12C is a diagram showing an example of a change in the voltage applied state of the energized bar when the switching control of the voltage applied state of the energized bar is executed, following FIG. 12B. FIG. 12D is a diagram showing an example of a change in the voltage applied state of the energized bar when the switching control of the voltage applied state of the energized bar is executed, following FIG. 12C. FIG. 13A is a diagram showing another example of a change in the voltage applied state of the energized bar when the switching control of the voltage applied state of the energized bar is executed. FIG. 13B is a diagram showing another example of a change in the voltage applied state of the energized bar when the switching control of the voltage applied state of the energized bar is executed, following FIG. 13A. FIG. 13C is a diagram showing another example of a change in the voltage applied state of the energized bar when the switching control of the voltage applied state of the energized bar is executed, following FIG. 13B. FIG. 13D is a diagram showing another example of a change in the voltage applied state of the energized bar when the switching control of the voltage applied state of the energized bar is executed, following FIG. 13C. FIG. 14A is a diagram showing a state in which the contact copper plate of the work holding hanger moves while being in contact with the adjacent energized piece. FIG. 14B is a diagram showing a state in which a contact copper plate moves while being in contact with an adjacent energized piece formed so as to have opposite sides perpendicular to the moving direction.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view of an electrodeposition coating apparatus 500 according to the present embodiment. As shown in FIG. 1, the electrodeposition coating apparatus 500 according to the present embodiment includes an electrodeposition tank 1, a transport device 2, a plurality of work holding hangers 3, a work identification hanger 4, a plurality of energizing bars 5, and a plurality of the electrodeposition coating devices 500. The diaphragm electrode 6 (counter electrode), the rectifier 7, and the control device 8 are provided.

The electrodeposition tank 1 is a container for storing the electrodeposition paint. In the electrodeposition tank 1, a concave space opened upward is formed, and the electrodeposition paint is stored in the concave space. The stored electrodeposition paint may be a cation type electrodeposition paint or an anion type electrodeposition paint. In this embodiment, a cation type electrodeposition coating material is used.

Further, the electrodeposition tank 1 has a boat shape as shown in FIG. 1, and is formed so as to extend long in the left-right direction of FIG. The object to be coated enters the electrodeposition tank 1 from one end side (the left side of the electrodeposition tank 1 in FIG. 1) in the longitudinal direction in the electrodeposition tank 1, and the object to be coated enters the electrodeposition tank 1 and the other end side (the electrodeposition tank in FIG. 1). The object to be coated leaves the electrodeposition tank 1 from the right side of 1). The object to be coated in the electrodeposition tank 1 is immersed in the electrodeposition paint. The end of the electrodeposition tank 1 on the side where the object to be coated enters is referred to as the entry area 11, and the end on the side where the object to be coated leaves is referred to as the exit area 13. Further, the portion between the entry area 11 and the exit area 13 is referred to as a total submerged area 12. In the total submerged area 12, the object to be coated is completely submerged in the electrodeposition paint.

The transport device 2 has a transport rail 21 extending in the longitudinal direction of the electrodeposition tank 1 in an upper region of the electrodeposition tank 1 and a driving means such as a motor (not shown). The transport rail 21 is provided with moving means such as a rail guide and a chain conveyor, and the moving means moves along the rail guide by driving the driving means. The transport rail 21 corresponds to the transport path of the present invention.

The transfer rail 21 includes a first rail portion 21a provided above the entry area 11 of the electrodeposition tank 1, a second rail portion 21b provided above the total immersion area 12 of the electrodeposition tank 1, and an electrodeposition tank. It has a third rail portion 21c provided above the rowing area 13 of 1. The first rail portion 21a is extended so as to descend and incline from the entry area 11 of the electrodeposition tank 1 toward the total submerged area 12. The second rail portion 21b is connected to the downstream end (lower end) of the first rail portion 21a and extends parallel to the longitudinal direction of the electrodeposition tank 1. The third rail portion 21c is connected to the downstream end (right end in FIG. 1) of the second rail portion 21b, and extends so as to climb and incline from the completely submerged area 12 of the electrodeposition tank 1 toward the rowing area 13. Will be set up.

The work holding hanger 3 holds a metal work as an object to be painted by the electrodeposition coating device 500. In the present embodiment, a plurality of types of works having different shapes or materials are held on the work holding hanger 3. FIG. 1 shows an elliptical first work W1 and a rectangular second work W2 as a plurality of types of works held on the work holding hanger 3. These works may be collectively referred to as work W. The shape, size, hanging position, etc. of the work W shown in the figure are shown for convenience of explanation.

The work identification hanger 4 holds a metal dummy work DW as an object to be painted by the electrodeposition coating device 500. The dummy work DW referred to here refers to an object to be coated, which is painted by the electrodeposition coating device 500 in the same manner as the work, but is not a product. On the other hand, the work W refers to an object to be coated as a product by the electrodeposition coating apparatus 500. The dummy work DW can be used repeatedly.

The work holding hanger 3 holding the work W and the work identification hanger 4 holding the dummy work DW are suspended from the moving means of the transport rail 21 in a state of being electrically insulated. When the drive device of the transfer device 2 is driven, the work holding hanger 3 and the work identification hanger 4 move along the transfer rail 21 in the extending direction of the transfer rail 21.

The work W is held so as to hang from the lower end of the work holding hanger 3, and the dummy work DW is held so as to hang from the lower end of the work identification hanger 4. Therefore, when the hangers (3, 4) move in the extending direction of the transfer rail 21, the work W and the dummy work DW held at the lower ends of the hangers (3, 4) are conveyed on the electrodeposition tank 1. It moves along the extension direction of the rail 21. Then, the work W and the dummy work DW enter the electrodeposition tank 1 from the entry tank area 11, are completely submerged in the electrodeposition paint in the total submerged area 12, and are withdrawn from the electrodeposition paint in the rowing area 13. .. As described above, the work holding hanger 3 and the work identification hanger 4 play a role of putting the held work W and the dummy work DW into the electrodeposition tank 1.

The work W and the dummy work DW are mainly electrodeposited and coated in the entire submerged area 12 of the electrodeposition tank 1. Therefore, for convenience of explanation, the work W, the dummy work DW, and the work are oriented in the direction in which the work W and the dummy work DW move in the electrodeposition tank 1 in the total submerged area 12, that is, in the direction from the left to the right in FIG. It is defined as the moving direction of the holding hanger 3 and the work identification hanger 4. The work W and the dummy work DW are electrodeposited and coated in the electrodeposition tank 1 while moving in the moving direction of FIG. The moving direction is parallel to the extension direction of the second rail portion 21b of the transport rail 21 and the second energizing bar portion 52 of the energizing bar 5, which will be described later. The extending direction of the transport rail 21 may be expressed as a moving direction.

Further, the transport rail 21 is configured so that a plurality of hangers (3, 4) can be suspended at equal intervals along the extending direction thereof. Therefore, the pitch (interval between adjacent hangers (3, 4)) of the hangers (3, 4) that move along the transport rail 21 while being suspended from the transport rail 21 is always constant.

Further, the work identification hangers 4 suspended from the transfer rail 21 are not arranged side by side along the transfer rail 21, and at least one work holding hanger 3 is arranged between the two work identification hangers 4. .. Further, when a plurality of work holding hangers 3 are arranged between the two work identification hangers 4, the works held by the plurality of work holding hangers 3 are the same type of work. That is, all the works held by the work holding hanger 3 following the work identification hanger 4 are the same type of work.

FIG. 2 is a schematic perspective view of the work holding hanger 3. As shown in FIG. 2, the work holding hanger 3 has a primary side hook portion 31 and a secondary side hook portion 32. The primary side hook portion 31 has an insulating portion 311, a current collector mounting portion 312, an arm portion 313, and a hanging portion 314.

The insulating portion 311 is formed of an insulating material and is connected to the moving means of the transport rail 21 at the upper portion thereof. The current collector mounting portion 312 is formed in a plate shape by a conductive metal, is connected to the insulating portion 311 and extends downward from the insulating portion 311. The arm portion 313 is formed by bending a rod-shaped member made of a conductive metal into a U shape. The arm portion 313 is horizontally extended and vertically separated from the upper arm portion 313a and the lower arm portion 313b, and the arm portion 313 is extended in the vertical direction and one end and the lower arm of the upper arm portion 313a. It has an intermediate arm portion 313c that connects to one end of the portion 313b. Then, the upper arm portion 313a is connected to the lower portion of the current collector mounting portion 312, and the lower arm portion 313b is connected to the upper portion of the hanging portion 314. The hook 314 is formed of a conductive metal and has a plurality of hooks 314a arranged in a row below the hook 314a. In FIG. 4, five hooks 314a are provided on the hanging portion 314. The secondary hook portion 32 is connected to the hook 314a.

The secondary side hook portion 32 is formed in a rod shape by a conductive metal, and one end (upper end in FIG. 4) thereof is hung on the hook 314a. In this case, the secondary hook portion 32 can be hung (connected) to each of the plurality of hooks 314a. Then, the work W is connected to the other end (lower end in FIG. 4) of the secondary side hook portion 32. In this way, the work W is held so as to hang from the lower end of the work holding hanger 3, specifically, the lower end of the secondary hook portion 32.

FIG. 3 is a schematic perspective view of the work identification hanger 4. The configuration of the work identification hanger 4 is basically the same as the configuration of the work holding hanger 3. As shown in FIG. 3, the work identification hanger 4 also has a primary side hook portion 41 and a secondary side hook portion 42. The primary side hook portion 41 has an insulating portion 411, a current collector mounting portion 412, an arm portion 413, and a hanging portion 414. Since the configurations of the insulating portion 411 and the current collector mounting portion 412 are the same as the configurations of the insulating portion 311 and the current collector mounting portion 312 of the work holding hanger 3, specific description thereof will be omitted.

Further, the arm portion 413 is formed by bending a rod-shaped member made of a conductive metal into a U shape. The arm portion 413 has an upper arm portion 413a, a lower arm portion 413b, and an intermediate arm portion 413c. The configurations of the upper arm portion 413a, the lower arm portion 413b, and the intermediate arm portion 413c are the same as the configurations of the upper arm portion 313a, the lower arm portion 313b, and the intermediate arm portion 313c of the arm portion 313 of the work holding hanger 3, respectively. Therefore, their specific description will be omitted.

The hook 414 has a plurality of hooks 414a arranged in a row in the lower portion thereof. In FIG. 5, five hooks 414a are provided on the hanging portion 414.

In the work identification hanger 4, the secondary hook portion 42 is connected only to the central hook 414A located at the center of the plurality of hooks 414a. The secondary hook portion 42 is formed in a rod shape by a conductive metal, and one end thereof (upper end in FIG. 3) is connected to the central hook 414A. Then, the dummy work DW is connected to the other end (lower end in FIG. 4) of the secondary side hook portion 42. In this way, the dummy work DW is held so as to hang from the lower end of the work identification hanger 4, specifically, the lower end of the secondary hook portion 42. Further, the work identification member 43 is provided in the upper portion of the secondary side hook portion 42. The work identification member 43 will be described later.

Further, as can be seen from FIGS. 2 and 3, the work holding hanger 3 and the work identification hanger 4 each have a current collector 9. The current collector 9 has a pair of current collector arms 91, 91 and a pair of contact copper plates 92, 92. The pair of current collector arms 91 and 91 are both formed in the shape of a round bar made of conductive metal, and one end of each is attached to the current collector attachment portion 312 (412) of the work holding hanger 3 (work identification hanger 4). In this case, the pair of current collector arms 91, 91 are attached to the current collector attachment portion 312 (412) so that the attachment positions of both are aligned in the vertical direction.

Further, the pair of current collector arms 91, 91 extend from the attachment end portion (one end portion) to the current collector attachment portion 312 (412) in a plane substantially perpendicular to the vertical direction. When the work holding hanger 3 or the work identification hanger 4 is attached to the transport rail 21, the pair of current collecting arms 91 and 91 are separated from each other toward the upstream side in the moving direction shown in FIG. It is a direction inclined by a predetermined acute angle with respect to the moving direction. Therefore, the pair of current collector arms 91, 91 are formed in a V shape so as to spread toward the upstream side from the current collector mounting portion 312 (412) when viewed from the vertical direction. The contact copper plates 92 and 92 are attached to the respective tips (the other ends) of the pair of current collector arms 91 and 91 formed in a V shape in this way. The energizing bar 5 is brought into contact with the contact copper plates 92 and 92.

As shown in FIG. 1, the energizing bar 5 is extended along the extending direction of the transport rail 21, and has a function of energizing the hangers (3, 4) moving along the transport rail 21. FIG. 4 is a diagram showing the transport rail 21 and the energizing bar 5 of FIG. As shown in FIG. 4, the energizing bar 5 is parallel to the first energizing bar portion 51 provided parallel to the lower side of the first rail portion 21a of the transport rail 21 and the lower side of the second rail portion 21b of the transport rail 21. It has a second energizing bar portion 52 provided in the above, and a third energizing bar portion 53 provided in parallel below the third rail portion 21c of the transport rail 21.

The first energizing bar portion 51, the second energizing bar portion 52, and the third energizing bar portion 53 are attached to the skeleton member in the present embodiment. This skeleton member is configured such that an insulating resin such as Teflon (registered trademark) is uniformly adhered to an iron angle member having the same shape as the outer shape of the energizing bar 5 shown in FIGS. 1 and 4. To. Then, a first energizing bar portion 51, a second energizing bar portion 52, and a third energizing bar portion 53 are formed on the surface of the insulating resin, respectively.

The first energizing bar portion 51, the second energizing bar portion 52, and the third energizing bar portion 53 are each formed of a conductive metal plate such as a copper plate. Similar to the first rail portion 21a, the first energizing bar portion 51 is formed in a long shape so as to descend and incline from the left side to the right side in FIG. The second energizing bar portion 52 is formed in a long shape along the left-right direction (moving direction) in FIG. 4, similarly to the second rail portion 21b. Similar to the third rail portion 21c, the third energizing bar portion 53 is formed in a long shape so as to climb and incline from the left side to the right side in FIG.

The first energizing bar portions 51 are integrally formed along the longitudinal direction. On the other hand, the second energizing bar portion 52 and the third energizing bar portion 53 are formed by being divided into a plurality of portions along the longitudinal direction. In this case, the second energizing bar portion 52 is attached to the insulating resin constituting the skeleton member by attaching an energizing piece 521 made of a plurality of conductive metals along the longitudinal direction (moving direction) with a minute gap. ,It is formed. Further, the third energizing bar portion 53 is formed by attaching an energizing piece 531 made of a plurality of conductive metals along the longitudinal direction (moving direction) to the insulating resin constituting the skeleton member with a small gap. It is formed. Therefore, the first energizing bar portion 51 is formed of a single conductive metal plate, but the second energizing bar portion 52 and the third energizing bar portion 53 are arranged at minute intervals along the longitudinal direction. It will be formed by a plurality of energizing pieces 521 and 531. The shapes of the plurality of energizing pieces 521 are all the same shape, and the shapes of the plurality of energizing pieces 531 are all the same shape. Further, the lengths of the plurality of energizing pieces 521 and 513 in the moving direction are equal to the pitch of the hangers (3, 4) moving in the moving direction along the transport rail 21. Since the first energizing bar portion 51 also constitutes a part of the energizing bar 5, it can be said that these are also divided energizing pieces. Therefore, it can be said that the energizing bar 5 is composed of a plurality of energizing pieces divided along the extending direction thereof.

FIG. 5 is a schematic view showing a boundary portion between adjacent energizing pieces 521A and 521B included in the second energizing bar portion 52. As shown in FIG. 5, the adjacent energizing pieces 521A and 521B each have opposite sides A1 and B1 facing each other in parallel. Further, the facing side A1 and the facing side B1 are formed so as to be inclined by the same angle with respect to the moving direction (extending direction of the second energizing bar portion 52).

Further, among the adjacent energizing pieces 521A and 521B, the downstream end position A2 of the opposite side A1 of the energizing piece 521A located on the upstream side in the moving direction is the opposite side B1 of the energizing piece 521B located on the downstream side in the moving direction. It is located on the downstream side of the upstream end position B2. Therefore, the facing side A1 of the energizing piece 521A is inclined with respect to the moving direction so as to overlap the facing side B1 of the adjacent energizing piece 521B in the direction perpendicular to the moving direction (vertical direction in FIG. 5). Will be there. In other words, the opposing sides A1 and B1 of the adjacent energized pieces 521A and 521B form a lap section L1 that overlaps in the vertical direction. That is, the lap section L1 is formed at the boundary between the adjacent energized pieces 521A and 521B. The vertical distance L2 between the facing side A1 and the facing side B1 in the lap section L1 is set to be shorter than the vertical length of the contact copper plate 92 included in the current collector 9 of the work holding hanger 3.

FIG. 6 is a schematic view of the transport rail 21, the hangers (3, 4) attached to the transport rail 21, and the energizing bar 5 as viewed from above. In FIG. 6, the moving direction is the direction from the left side to the right side of FIG. Further, the vertical direction in FIG. 6 is defined as the width direction. As shown in FIG. 6, in the present embodiment, a pair of energizing bars 5 and 5 are provided in the electrodeposition coating device 500. The pair of energizing bars 5 and 5 are arranged in parallel with the transport rail 21 at equal distances in the width direction about the transport rail 21. The positions of the first energizing bar portions 51, 51, the second energizing bar portions 52, 52, and the third energizing bar portions 53, 53 of the pair of energizing bars 5 and 5 in the moving directions are the same.

Further, the hangers (3, 4) attached to the transport rail 21 move in the moving direction (extending direction of the transport rail 21) along the transport rail 21, and the hangers (3, 4) have the hanger (3, 4) accordingly. The current collector 9 also moves in the moving direction (extending direction of the transport rail 21). At this time, the contact copper plates 92 and 92 attached to the tips of the current collector arms 91 and 91 of the current collector 9 are the first current-carrying bar portion 51 of the current-carrying bar 5, and the plurality of current-carrying pieces 521 of the second current-carrying bar portion 52. In addition, the plurality of energizing pieces 531 of the third energizing bar portion 53 are sequentially contacted. Therefore, the hangers (3, 4) move in the moving direction (extending direction of the transport rail 21) along the transport rail 21, and sequentially contact a plurality of current-carrying pieces constituting the current-carrying bar 5 in the current collector 9. It is configured to do. When the current collector 9 comes into contact with the energizing bar 5, the hanger (3, 4) is energized from the energizing bar 5.

Further, as described above, the work identification member 43 is attached to the secondary side hook portion 42 of the work identification hanger 4. The shape of the work identification member 43 is shaped according to the type of work held by the work holding hanger 3 following the work identification hanger 4 to which the work identification member 43 is attached. Therefore, the number of work identification members 43 is prepared according to the type of work.

FIG. 7 is a schematic plan view of a work identification member corresponding to each of a plurality of types of workpieces, and FIG. 8 is a schematic front view of the work identification member corresponding to each of a plurality of types of workpieces as viewed from the downstream side in the moving direction. be. 7 (a) and 8 (a) show the first work identification member 431 corresponding to the first work W1, and FIGS. 7 (b) and 8 (b) show the second work corresponding to the second work W2. The work identification member 432 is shown respectively. Further, in FIG. 8, the secondary hook portion 42 to which each work identification member is attached and the dummy work DW attached to the secondary hook portion 42 are shown by broken lines. Further, FIGS. 7 and 8 show directions when the work identification hanger 4 to which the work identification member is attached is attached to the transport rail 21, respectively.

As shown in FIGS. 7 and 8, the work identification member corresponding to any of the works has a main body portion 43a and a protrusion portion 43b. The main body portion 43a is formed in a hexagonal columnar shape having a central axis along the vertical direction. Further, as is well shown in FIG. 7, the main body portion 43a formed in a hexagonal columnar shape has two side surfaces (first side surface 43c and second side surface 43d) facing each other in the width direction and parallel to each other in the moving direction. The first side surface 43c constitutes one side surface in the width direction of the main body portion 43a (the left side surface of the main body portion 43a in FIGS. 7 and 8), and the second side surface 43d constitutes the other side surface (the other side surface in the width direction of the main body portion 43a). In FIGS. 7 and 8, the right side surface of the main body 43a) is configured.

The protrusion 43b is formed in a triangular columnar shape having a central axis along the vertical direction. Further, the vertical length of the protrusion 43b is equal to the vertical length of the main body 43a. Such a triangular columnar protrusion 43b is provided on either the first side surface 43c or the second side surface 43d of the main body portion 43a. Which side surface the protrusion 43b is provided on is determined by the work corresponding to the identification member. Specifically, in the first work identification member 431 corresponding to the first work W1, the protrusion 43b is the first side surface of the main body 43a as shown in FIGS. 7 (a) and 8 (a). It is provided in 43c. In the second work identification member 432 corresponding to the second work W2, the protrusion 43b is provided on the second side surface 43d of the main body 43a as shown in FIGS. 7 (b) and 8 (b). The first side surface 43c and the second side surface 43d are formed at different positions in the width direction. Therefore, the position in the width direction of the protrusion 43b provided on the first work identification member 431 is different from the position in the width direction of the protrusion 43b provided on the second work identification member 432.

As described above, in the present embodiment, each work identification member is configured so that the position in the width direction of the protrusion 43b of each work identification member is different. Therefore, the work corresponding to the work identification member is identified by the position in the width direction of the protrusion 43b. Then, the electrodeposition coating apparatus 500 is provided with a detecting means for detecting the protrusion 43b provided on the work identification member. In addition, each work identification member may be configured so that the position in the height direction of the protrusion 43b of each work identification member is different.

As shown in FIG. 1, a work identification unit 101 as a detection means is provided at an upstream position immediately before the entry area 11 of the electrodeposition tank 1. The work identification unit 101 identifies the work W corresponding to the work identification member 43 attached to the work identification hanger 4. FIG. 9 is a schematic view of the positional relationship between the work identification member 43 and the work identification unit 101 as viewed from the downstream side in the moving direction. As shown in FIG. 9, the work identification unit 101 has a first limit switch 101a and a second limit switch 101b.

Each limit switch has a switch main body 102 and a rod-shaped actuator 103, and when the actuator 103 operates, the micro switch built in the switch main body 102 is turned on and a detection signal is output. Further, the first limit switch 101a is located on one side in the width direction (left side in FIG. 9), and the second limit switch 101b is located on the other side in the width direction (right side in FIG. 9). The work identification hanger 4 passes between these limit switches divided in the width direction. When viewed from the work identification member 43 of the passing work identification hanger 4, the first limit switch 101a is located on the first side surface 43c side of the main body portion 43a, and the second limit switch 101b is the second side surface of the main body portion 43a. It is located on the 43d side.

Further, the actuator 103 of the first limit switch 101a extends horizontally from the switch main body 102 toward the other side (right side in FIG. 9) in the width direction. Therefore, as can be seen from FIG. 9, the tip of the actuator 103 of the first limit switch 101a faces the first side surface 43c of the work identification member 43 of the passing work identification hanger 4.

Further, the actuator 103 of the second limit switch 101b extends horizontally from the switch main body 102 toward one side (left side in FIG. 9) in the width direction. Therefore, as can be seen from FIG. 9, the tip of the actuator 103 of the second limit switch 101b faces the second side surface 43d of the work identification member 43 of the passing work identification hanger 4.

FIG. 10 is a schematic view of the positional relationship between each work identification member provided on the work identification hanger 4 and each limit switch as viewed from the downstream side in the moving direction. As shown in FIG. 10A, the height position (vertical position) of the actuator 103 of the first limit switch 101a coincides with the height position of the first work identification member 431 corresponding to the first work W1. Further, as described above, the actuator 103 of the first limit switch 101a faces the first side surface 43c of the work identification member 43 provided on the passing work identification hanger 4. A protrusion 43b is provided on the first side surface 43c of the first work identification member 431. Therefore, the actuator 103 of the first limit switch 101a operates in contact with the protrusion 43b of the first work identification member 431 when the work identification hanger 4 provided with the first work identification member 431 passes through the actuator 103. The micro switch in the switch body 102 is turned on by the operation, and the detection signal is output. In this way, the first work W1 is identified by the first limit switch 101a.

Further, as shown in FIG. 10B, the height position of the actuator 103 of the second limit switch 101b coincides with the height position of the second work identification member 432 corresponding to the second work W2. Further, as described above, the actuator 103 of the second limit switch 101b faces the second side surface 43d of the work identification member 43 provided on the passing work identification hanger 4. A protrusion 43b is provided on the second side surface 43d of the second work identification member 432. Therefore, when the work identification hanger 4 provided with the second work identification member 432 passes, the actuator 103 of the second limit switch 101b comes into contact with the protrusion 43b of the second work identification member 432 and operates. The micro switch in the switch body 102 is turned on by the operation, and the detection signal is output. In this way, the second work W2 is identified by the second limit switch 101b.

In this way, each work is identified by the work identification unit 101 including two limit switches.

Further, as shown in FIG. 1, the first work W1 is held by the work holding hanger 3 following the work identification hanger 4 provided with the first work identification member 431, and the second work identification member 432 is provided. The second work W2 is held on the work holding hanger 3 following the work identification hanger 4. Therefore, the work identification unit 101 detects the type of work held by the work holding hanger 3 following the work identification hanger 4 having the work identification member 43 as the detection target.

Further, as shown in FIG. 1, the electrodeposition coating apparatus 500 includes a count limit switch 105 as a counting means. The count limit switch 105 is provided together with the work identification unit 101 at a position immediately before the entry area 11 of the electrodeposition tank 1. Further, the count limit switch 105 is provided so as to be in contact with the insulating portion 311 of the work holding hanger 3. Therefore, every time the work holding hanger 3 passes through the count limit switch 105, the insulating portion 311 contacts the count limit switch 105 (specifically, the insulating portion 311 hits the count limit switch 105) and outputs a detection signal. .. As a result, the count limit switch 105 counts the number of works W held by the work holding hanger 3 following the work identification hanger 4 into the electrodeposition tank 1. As the counting means, a photoelectric sensor or the like using a phototube or the like can also be adopted. In this case, each time the work holding hanger 3 passes, the light projected from the photoelectric sensor is blocked by the insulating portion 311 of the work holding hanger 3, so that the number of works W is counted.

Further, the plurality of diaphragm electrodes 6 are arranged inside the electrodeposition tank 1 in a state of being immersed in the electrodeposition paint stored in the recessed space of the electrodeposition tank 1.

The rectifier 7 has a function of converting AC power into DC power and applying a predetermined DC voltage between the plurality of diaphragm electrodes 6 and the energizing bar 5. The rectifier 7 has a positive terminal 71 and a negative terminal 72, the positive terminal 71 is connected in parallel to each of the plurality of diaphragm electrodes 6, and the negative terminal 72 is connected to the control device 8. The rectifier 7 corresponds to the voltage application device of the present invention.

The control device 8 has a control circuit 81 and a relay 82. A detection signal is input to the control circuit 81 from the work identification unit 101 and the count limit switch 105. Then, the relay 82 is controlled based on the input detection signal. The relay 82 is configured by connecting a plurality of relay contacts in parallel. Each relay contact has a movable contact and a fixed contact, and the movable contact is electrically connected to the negative terminal 72 of the rectifier 7. On the other hand, the fixed contacts of each relay contact are electrically connected to the energizing bar 5. By controlling the relay 82 by the control circuit 81, the voltage application state (energization state) of the energization bar 5 is controlled.

Here, the fixed contacts of the plurality of relay contacts are connected to each energizing piece 521 constituting the first energizing bar portion 51, the second energizing bar portion 52, and each energizing piece 531 constituting the third energizing bar portion 53, respectively. The bar. Therefore, the first energizing bar portion 51 and the rectifier 7, the divided energizing pieces 521 and the rectifier 7 of the second energizing bar portion 52, and the divided energizing pieces 531 and the rectifier 7 of the third energizing bar portion 53, respectively. The state of electrical connection with and the state of application of voltage, that is, the state of application of voltage can be controlled independently.

In the electrodeposition coating device 500 having the above configuration, as described above, the work holding hanger 3 and the work identification hanger 4 attached to the transport rail 21 by the transport device 2 are arranged in the extending direction (moving direction) of the transport rail 21. Moving. As a result, the work W held by the work holding hanger 3 and the dummy work DW held by the work identification hanger 4 enter the electrodeposition tank 1 from the tank area 11 of the electrodeposition tank 1. Further, a predetermined DC voltage is applied between the diaphragm electrode 6 and the energizing bar 5 by the rectifier 7. As a result, the diaphragm electrode 6 serves as an anode, and the energizing bar 5 serves as a cathode. Further, the work W or the dummy work DW immersed in the electrodeposition paint in the electrodeposition tank 1 comes into contact with the energizing bar 5 via the hanger (3, 4) holding the work W or the dummy work DW. There is. Therefore, the work W or the dummy work DW in the electrodeposition paint serves as a cathode. As a result, the electrodeposited paint having an electric charge in the electrodeposition tank 1 is attracted to the work W or the dummy work DW as the cathode. Further, hydrogen gas and hydroxide ions are generated by the electrolysis reaction of water near the work W as the cathode or the dummy work DW, and these hydroxide ions react with the H ⁺ ions of the electrodeposition paint to ionize the electrodeposition paint. It loses its properties, becomes insoluble, and precipitates on the work W or dummy work DW. In this way, the work W or the dummy work DW is cationically electrodeposited.

In the present embodiment, a plurality of types of workpieces W1 and W2 having different shapes or materials are electrodepositionally coated using one electrodeposition tank 1. Since the film forming conditions of the coating film formed on the work by electrodeposition coating differ depending on the shape and material of the work, when a plurality of types of workpieces having different shapes or materials are electrodeposited and coated by one electrodeposition tank 1. Every time the is changed, it is necessary to set the conditions suitable for the workpiece to be painted, especially the energization time. In this regard, in the present embodiment, the control device 8 applies the voltage of the energizing bar 5 when the work to be put into the electrodeposition tank 1 is switched, that is, when a new work is put into the electrodeposition tank 1. By executing the state switching control, it is configured so that electrodeposition coating can be performed using one electrodeposition tank 1 with an energization time suitable for each of a plurality of types of workpieces. The method of switching and controlling the application state of the voltage of the energizing bar 5 by the control device 8 will be described below. In the following description, it is assumed that a constant voltage is applied to the first energizing bar portion 51 of the energizing bar 5 during the execution of electrodeposition coating.

FIG. 11 is a flowchart showing a flow of switching control of the voltage applied state of the energizing bar 5 executed by the control device 8. According to this flowchart, first, the control device 8 inputs a detection signal from the work identification unit 101 during execution of electrodeposition coating (S1). When the detection signal is not input, the control device 8 does not change the voltage application state of the energizing bar 5.

When the detection signal is input from the work identification unit 101, the control device 8 identifies the work by specifying the limit switch that outputs the detection signal among the limit switches 101a and 101b (S2). Then, a preset target count number is set for the identified work (S3). The target count number referred to here is the work W after the work W is placed in the electrodeposition tank 1 until a coating film having a desired film thickness is formed on the work W and the electrodeposition coating is completed. Corresponds to the number of subsequent workpieces that subsequently enter the electrodeposition tank 1. In other words, the target count number is detected by the work holding hanger 3 holding the work W by hitting the count limit switch 105, and then a coating film having a desired film thickness is formed on the work W to perform electrodeposition coating. It corresponds to the time (number of seconds) to complete. Further, the time from when the work W enters the electrodeposition tank 1 (after hitting the count limit switch 105) until the electrodeposition coating of the work W is completed is for electrodeposition coating on the work W. It is the time when the voltage is applied, that is, the energization time. Therefore, it can be said that the target count number represents the energization time set for the work W.

Next, the control device 8 counts the number of inputs of the detection signal input from the count limit switch 105 after setting the target count number. Further, the control device 8 controls the voltage application to the energization bar 5 while the number of inputs (counts) to be counted is equal to or less than the target count number (S4). In this voltage application control, the voltage application state to the energization bar 5 is controlled so that the voltage is applied to the portion of the energization bar 5 that the work identification hanger 4 contacts before the count reaches the target count number. do. For example, if the work identification hanger 4 is in contact with any of the energizing pieces 521 constituting the second energizing bar portion 52 before the count number reaches the target count number, the relay contact connected to the energizing piece 521 is connected. Set to the ON state. Here, if the application of the voltage to the energized piece 521 to which the work identification hanger 4 comes into contact before the count reaches the target count is stopped before the work identification hanger 4 comes into contact, the control device 8 is used. , The relay contact connected to the energizing piece 521 is controlled so that the application of the voltage to the energizing piece 521 is started at the time of contact of the work identification hanger 4. On the other hand, if the voltage is already applied to the energized piece 521 to which the work identification hanger 4 comes into contact before the count reaches the target count, before the work identification hanger 4 comes into contact, the work is identified to the energized piece 521. Even when the hanger 4 comes into contact with the hanger 4, the state of applying the voltage to the energizing piece 521 is not changed. That is, the voltage application is maintained. In this way, before the count reaches the target count, the voltage is applied to the energized piece of the energizing bar 5 at which the voltage should be applied, when the work identification hanger 4 is in contact with the energized piece. By doing so, the state of application of the voltage to the energizing bar 5 is controlled. Which part of the energizing bar 5 the work identification hanger 4 is in contact with can be determined from the count number.

Further, the control device 8 controls the voltage application stop to the energization bar 5 after the count number reaches the target count number (S5). In this voltage application stop control, the voltage is applied to the energization bar 5 so that the application of the voltage to the portion of the energization bar 5 to which the work identification hanger 4 comes into contact after the count reaches the target count number is stopped. Control the state. For example, when the work identification hanger 4 is in contact with any of the energizing pieces 521 constituting the second energizing bar portion 52 after the count number reaches the target count number, the relay contact connected to the energizing piece 521 is connected. Set to the OFF state. Here, when a voltage is applied to the energized piece 521 to which the work identification hanger 4 comes into contact after the count reaches the target count, the control device 8 applies the voltage to the energized piece 521. The relay contact connected to the energizing piece 521 is controlled so as to be stopped at the time of contact of the identification hanger 4. On the other hand, if the application of voltage to the energized piece 521 to which the work identification hanger 4 comes into contact after the count reaches the target count has already been stopped before the contact of the work identification hanger 4, the energized piece 521 is affected. Even when the work identification hanger 4 comes into contact with the work identification hanger 4, the voltage application state is not changed. That is, the stop of voltage application is maintained. In this way, after the count reaches the target count, the voltage is applied to the energized piece of the energization bar 5 at which the voltage application should be stopped when the work identification hanger 4 is in contact with the energized piece. By stopping, the state of application of the voltage to the energizing bar 5 is controlled.

As described above, in the voltage application control of S4 and the voltage application stop control of S5, the control device 8 applies the voltage to the energized piece whose voltage application state should be changed among the plurality of energized pieces constituting the energizing bar 5. The state is changed at the time when the work identification hanger 4 is in contact with the work identification hanger 4. Here, when the target energizing piece for which the voltage application state is changed is the energizing piece 521 of the second energizing bar portion 52 or the energizing piece 531 of the third energizing bar portion 53, the lengths of the energizing pieces 521 and 531 are hangers. Since the pitches of (3, 4) match, the work before and after the work identification hanger 4 is in contact with the energized pieces 521 and 531 (when the voltage application state is changed). The holding hanger 3 does not come into contact with the energizing piece 521.

Further, when the count number is larger than the target count number and reaches the upper limit count number preset as the count number indicating the timing when the work identification hanger 4 leaves the electrodeposition tank 1. The count of the count number is finished (S6).

When the work to be put into the electrodeposition tank 1 is switched by the switching control of the voltage applied state of the energization bar 5 as described above, the energization suitable for the work to be newly put into the electrodeposition tank 1 after the switching is performed. You can set the time. As a result, it is possible to set an energization time suitable for each of a plurality of types of workpieces.

(First Example)
12A to 12D are diagrams showing an example of a change in the voltage applied state of the energized bar 5 when the switching control of the voltage applied state of the energized bar 5 is executed. In this example, the voltage of the energization bar 5 when the energization time of the work newly placed in the electrodeposition tank 1 is shorter than the energization time of the work (immediately preceding work) currently in the electrodeposition tank 1. Changes in the applied state are shown.

First, as shown in FIG. 12A, it is assumed that all the workpieces in the electrodeposition tank 1 are the first work W1, and the second work W2 is newly entered from that state. Further, when the first work W1 is electrodeposition-painted, all sections of the energizing bar 5, that is, all the energizing pieces 521 constituting the first energizing bar portion 51, the second energizing bar portion 52, and the third energizing bar. A voltage is applied to all the energizing pieces 531 constituting the unit 53. That is, all the relay contacts of the relay 82 of the control device 8 are set to the ON state.

Further, immediately after the first work W1 at the end of the first work W1 in the electrodeposition tank 1, a work having a second work identification member 432 for identifying the second work W2 is provided. The identification hanger 4 is located. Then, the work identification hanger 4 is followed by a work holding hanger 3 holding the second work W2. That is, the work identification hanger 4 provided with the second work identification member 432 is positioned at the head of the work holding hanger 3 holding the second work W2. When the work identification hanger 4 moves from the state shown in FIG. 12A, the second work identification member 432 is detected by the work identification unit 101, so that a detection signal is input to the control device 8 (S1), thereby newly. The arrival of a new work is detected, and it is identified that the new work to be entered next to the first work W1 is the second work W2 (S2).

Further, the energization time set for the second work W2 following the work identification hanger 4 provided with the second work identification member 432 is held by the work holding hanger 3 located immediately before the work identification hanger 4. It is shorter than the energization time set for the work W1 (immediately before work). In FIG. 12A, the second work W2 is in the electrodeposition tank until the electrodeposition coating is completed after the energization time set for the second work W2 has elapsed since the second work W2 entered the electrodeposition tank 1. The distance traveled within 1 is represented as an energized section. Further, the first work W1 enters the electrodeposition tank 1 from the time when the first work W1 enters the electrodeposition tank 1 until the energization time set for the first work W1 elapses and the electrodeposition coating is completed. The distance traveled is represented as the pre-energized section. The energized section and the pre-energized section represent the contact area of the energized bar 5 with which the work holding hanger 3 for holding the work is in contact until the electrodeposition coating of the work is completed. The energization section and the pre-energization section are proportional to the energization time set for the second work W2 and the first work W1, respectively. Therefore, the lengths of the energized section and the pre-energized section represent the energized time.

As can be seen from FIG. 12A, the energization section (energization time) for the second work W2 is shorter than the pre-energization section (energization time) for the first work W1. Specifically, the pre-energized section is all sections from the first energized bar section 51 to the third energized bar section 53, whereas the energized section is from the first energized bar section 51 to the second energized bar section. It is a section up to the middle of 52. Therefore, when the work entering the electrodeposition tank 1 is switched from the first work W1 to the second work W2, the voltage is applied to the portion of the energization bar 5 on the downstream side in the moving direction from the energization section shown in FIG. 12A. Must be stopped. Specifically, it is necessary that the application of voltage to the tenth and subsequent energizing pieces 521 and the energizing piece 531 from the upstream side among the energizing pieces 521 constituting the second energizing bar portion 52 is stopped. Further, as can be seen from FIG. 12A, the number of works existing in the energized section of the second work W2 is 16. Therefore, the target count number is set to 16 (S3).

When the work identification hanger 4 moves from the state shown in FIG. 12A, the dummy work DW held by the work identification hanger 4 enters the electrodeposition tank 1. Further, the work holding hanger 3 following the work identification hanger 4 also moves, and the second work W2 held by them sequentially enters the electrodeposition tank 1. When the second work W2 sequentially enters the electrodeposition tank 1, the work holding hanger 3 passes through the count limit switch 105, and at that time, the insulating portion 311 of the work holding hanger 3 hits the count limit switch 105. A detection signal is output from the count limit switch 105 to the control device 8. As a result, the count corresponding to the number of the second work W2 held by the work holding hanger 3 following the work identification hanger 4 advances. When the count number counted in this way is before the target count number is reached, that is, while the count number is equal to or less than the target count number, the dummy work DW held by the work identification hanger 4 is moving in the energized section. .. While the dummy work DW is moving in the energization section (that is, while the count number is equal to or less than the target count number), the voltage application control to the energization bar 5 is controlled (S4). Here, in this example, the voltage has already been applied to the portion of the energization bar 5 that comes into contact with the work identification hanger 4 while the dummy work DW is moving in the energization section. Therefore, the state of application of the voltage to those portions does not change. FIG. 12B shows a state in which a voltage is applied to the energization bar 5 when the dummy work DW is moving in the energization section.

When the count number reaches the target count number (= 16), the voltage application stop control is performed thereafter, and the work identification hanger is performed after the energization bar 5 (that is, after the count number reaches the target count number). The application of the voltage to the portion in contact with 4 is stopped (S5). FIG. 12C shows a state in which the work identification hanger 4 is in contact with the energized piece 521a outside the energized section among the energized pieces of the second energized bar portion 52 after the count number reaches 16. A voltage is applied to the energizing piece 521a before the contact of the work identification hanger 4, but the application of the voltage to the energizing piece 521a is stopped at the time of contact of the work identification hanger 4. That is, the state of applying the voltage to the energizing piece 521a to change the state of applying the voltage is changed at the time of contact with the work identification hanger 4.

After that, the work identification hanger 4 moves further downstream and comes into contact with the energized piece 521b on the most downstream side of the second energized bar portion 52. A voltage is also applied to the energizing piece 521b before the contact of the work identification hanger 4, but the application of the voltage to the energizing piece 521b is stopped at the time of contact of the work identification hanger 4. After that, the work identification hanger 4 moves downstream and comes into contact with each energized piece 531 of the third energized bar portion 53. A voltage is applied to each energizing piece 531 of the third energizing bar portion 53 before the work identification hanger 4 is contacted, but the voltage application to the energizing piece 531 is stopped at the time when the work identification hanger 4 is contacted. In this way, among the energized pieces to which the voltage is applied based on the energization time set for the first work W1 (that is, the energized pieces in the pre-energized section), the energized pieces that do not need to apply the voltage (that is, the energized pieces). The application of the voltage to the energized piece) outside the energized section is stopped at the time of contact with the work identification hanger 4.

After that, when the count number reaches the upper limit count number, the switching control of the voltage application state of the energizing bar 5 is completed. FIG. 12D shows the voltage application state of the energization bar 5 when the switching control of the voltage application state of the energization bar 5 is completed. As shown in FIG. 12D, the electrodeposition tank 1 is filled with the second work W2 after the switching control of the voltage applied state of the energization bar 5 is completed, but at this time, it is already in the energization section of the energization bar 5. A voltage is applied to the portion of, and no voltage is applied to the portion outside the energized section. That is, the voltage applied state of the energizing bar 5 is set so that the second work W2 is electrodeposited and coated at an energization time suitable for the electrodeposition coating condition of the second work W2. Therefore, a coating film having a desired film thickness can be formed on the subsequent second work W2.

(Second Example)
13A to 13D are diagrams showing other examples of changes in the voltage applied state of the energized bar 5 when the switching control of the voltage applied state of the energized bar 5 is executed. In this example, the change in the voltage application state of the energization bar 5 when the energization time of the work newly placed in the electrodeposition tank 1 is longer than the energization time of the work currently in the electrodeposition tank 1. Is shown.

First, as shown in FIG. 13A, it is assumed that all the workpieces in the electrodeposition tank 1 are the second work W2, and the first work W1 is newly entered from that state. When the second work W2 is electrodeposited, a voltage is applied to the first energizing bar portion 51 and the energizing pieces 521 constituting the second energizing bar portion 52, from the upstream side to the fourth energizing piece 521. Therefore, the application of voltage is stopped in the portion after the fifth energizing piece 521 from the upstream side. Therefore, among the relay contacts of the relay 82 of the control device 8, the relay contact connected to the fourth energizing piece 521 from the upstream among the energizing pieces 521 of the first energizing bar portion 51 and the second energizing bar portion 52 is It is set to the ON state, and the other relay contacts are set to the OFF state.

Further, immediately after the second work W2 at the end of the second work W2 in the electrodeposition tank 1, a work having a first work identification member 431 for identifying the first work W1 is provided. The identification hanger 4 is located. Then, the work identification hanger 4 is followed by a work holding hanger 3 holding the first work W1. That is, the work identification hanger 4 provided with the first work identification member 431 is positioned at the head of the work holding hanger 3 holding the first work W1. When the work identification hanger 4 moves from the state shown in FIG. 13A, the first work identification member 431 is detected by the work identification unit 101, so that a detection signal is input to the control device 8 (S1), thereby newly. The arrival of a new work is detected, and it is identified that the new work to be entered next to the second work W2 is the first work W1 (S2).

Further, the energization time set for the first work W1 following the work identification hanger 4 provided with the first work identification member 431 is held by the work holding hanger 3 located immediately before the work identification hanger 4. It is longer than the energization time set for work W2 (immediate work). In FIG. 13A, the first work W1 is in the electrodeposition tank until the electrodeposition coating is completed after the energization time set for the first work W1 has elapsed since the first work W1 entered the electrodeposition tank 1. The distance traveled within 1 is represented as an energized section. Further, the second work W2 enters the electrodeposition tank 1 from the time when the second work W2 enters the electrodeposition tank 1 until the energization time set for the second work W2 elapses and the electrodeposition coating is completed. The distance traveled is represented as the pre-energized section.

As can be seen from FIG. 13A, the energization section (energization time) for the first work W1 is longer than the pre-energization section (energization time) for the second work W2. Specifically, the front energization section is a section from the first energization bar section 51 to the fourth energization piece 521 from the upstream of the second energization bar section 52, whereas the energization section is the first energization bar section. It is a section from 51 to the eighth energizing piece 521 from the upstream of the second energizing bar portion 52. Therefore, when the work entering the electrodeposition tank 1 is switched from the second work W2 to the first work W1, the energized pieces 521 are transferred to the fifth to eighth energized pieces (521c, 521d, 521e, 521f) from the upstream. It is necessary to apply the voltage of. Further, as can be seen from FIG. 13A, the number of works existing in the energized section of the first work W1 is 15. Therefore, the target count number is set to 15 (S3).

When the work identification hanger 4 moves from the state shown in FIG. 13A, the dummy work DW held by the work identification hanger 4 enters the electrodeposition tank 1. Further, the work holding hanger 3 following the work identification hanger 4 also moves, and the first work W1 held by them sequentially enters the electrodeposition tank 1. When the first work W1 sequentially enters the electrodeposition tank 1, the work holding hanger 3 passes through the count limit switch 105, and at that time, the insulating portion 311 of the work holding hanger 3 hits the count limit switch 105. A detection signal is output from the count limit switch 105 to the control device 8. As a result, the count corresponding to the number of the first work W1 held by the work holding hanger 3 following the work identification hanger 4 advances. When the count number counted in this way is before the target count number is reached, that is, while the count number is equal to or less than the target count number, the dummy work DW held by the work identification hanger 4 is moving in the energized section. .. While the dummy work DW is moving in the energization section (that is, while the count number is equal to or less than the target count number), the voltage application control to the energization bar 5 is controlled (S4). Here, when the dummy work DW moves in the energized section, the work identification hanger 4 comes into contact with the first to eighth energized pieces 521 from the upstream of the energized pieces 521 constituting the second energized bar portion 52. A voltage has already been applied to the first to fourth energized pieces 521 from the upstream before the contact of the work identification hanger 4. Therefore, the state of application of the voltage to these energizing pieces 521 does not change. FIG. 13B shows a state in which the work identification hanger 4 is in contact with the second energizing piece 521 from the upstream. As shown in FIG. 13B, the relay contact of the relay 82 connected to the energizing piece 521 in contact with the work identification hanger 4 remains ON, and the voltage is still applied to the energizing piece 521.

On the other hand, no voltage is applied to the fifth to eighth energized pieces (521c, 521d, 521e, 521f) from the upstream before the contact of the work identification hanger 4. Therefore, the application of voltage to these energized pieces 521 is started at the time of contact with the work identification hanger 4. That is, the state of applying the voltage to the energizing piece 521 to change the state of applying the voltage is changed at the time of contact of the work identification hanger 4. FIG. 13C shows a state in which the work identification hanger 4 is in contact with the fifth energizing piece 521c from the upstream. At the time of contact of the work identification hanger 4, the relay contact connected to the energized piece 521c is turned on to the energized piece 521c, and the application of voltage to the energized piece 521c is started. Similarly, for the energized pieces 521d, 521e, and 521f, the application of voltage to these energized pieces is started at the time of contact with the work identification hanger 4. In this way, among the energized pieces to which the voltage is not applied based on the energization time set for the second work W2 (that is, the energized pieces outside the pre-energized section), the energized pieces to which the voltage should be applied (that is, the energized section). The application of the voltage to the energized piece) is started at the time of contact with the work identification hanger 4.

When the count number reaches the target count number (= 15), the voltage application stop control is performed thereafter, and the work identification hanger is performed after the energization bar 5 (that is, after the count number reaches the target count number). The application of the voltage to the portion in contact with 4 is stopped. In this case, the portion of the energization bar 5 to which the work identification hanger 4 comes into contact after the count reaches the target count number (the energization piece 521 of the second energization bar 52, the ninth and subsequent energization pieces from the upstream, and the second energization piece 521. (3) The application of voltage to all the energizing pieces 531) constituting the energizing bar portion 53 has already been stopped. Therefore, in this voltage application stop control, the voltage application state of the energization bar 5 does not change.

After that, when the count number reaches the upper limit count number, the switching control of the voltage application state of the energizing bar 5 is completed. FIG. 13D shows the voltage application state of the energization bar 5 when the switching control of the voltage application state of the energization bar 5 is completed. As shown in FIG. 13D, the electrodeposition tank 1 is filled with the first work W1 after the switching control of the voltage applied state of the energization bar 5 is completed, but at this time, it is already in the energization section of the energization bar 5. A voltage is applied to the portion of, and no voltage is applied to the portion outside the energized section. That is, the voltage applied state of the energizing bar 5 is set so that the first work W1 is electrodeposited and coated at an energization time suitable for the electrodeposition coating conditions of the first work W1. Therefore, a coating film having a desired film thickness can be formed on the subsequent first work W1.

As described above, according to the embodiment of the present invention, the control device 8 controls the voltage application to the energization bar 5 before the count reaches the target count, and after the count reaches the target count, the energization bar 5 is controlled. Controls the voltage application stop. That is, the state of applying the voltage to the energizing bar 5 is controlled based on the target count number. Further, as described above, the target count number represents the energization time of the work entering the electrodeposition tank 1. Therefore, the control device 8 controls the application state of the voltage to the energization bar 5 based on the energization time of the work entering the electrodeposition tank 1.

Further, the energizing bar 5 includes a first energizing bar section 51, a second energizing bar section 52, and a third energizing bar section 53, and the second energizing bar section 52 and the third energizing bar section 53 each include a plurality of energizing pieces. It is divided into 521 and 531. Since the first energizing bar portion 51 can also be regarded as a split piece constituting the energizing bar 5, it can be said that the energizing bar 5 is composed of a plurality of energizing pieces divided along the extending direction. Therefore, the control device 8 controls the application state of the voltage to the plurality of energizing pieces constituting the energizing bar 5 based on the energizing time of the work entering the electrodeposition tank 1.

Further, according to the above-described embodiment, the control device 8 constitutes the energizing bar 5 when the work W held by the work holding hanger 3 following the work identification hanger 4 enters the electrodeposition tank 1. The energization set for the work W to be entered by changing the application state of the voltage to the energizing piece whose voltage application state should be changed among the plurality of energizing pieces at the time when the work identification hanger 4 is in contact with the energizing piece. The state of application of voltage to a plurality of energized pieces is controlled based on time.

By the control device 8 controlling the voltage applied state to the energized piece as described above, that is, the switching control of the voltage applied state of the energizing bar 5, electrodeposition coating is performed for each workpiece at the optimum energizing time. It can be performed. Therefore, a plurality of types of workpieces can be electrodeposited and coated using one electrodeposition tank 1. In electrodeposition coating, when the film thickness is not so thick, the film thickness is substantially proportional to the time. Therefore, the film thickness of the coating film formed while the work holding hanger 3 is in contact with one energizing piece 521 or one energizing piece 531 can be adjusted by the moving speed of the hangers (3, 4). can. In this case, for example, fine film thickness control can be performed by setting the film thickness that grows while the work holding hanger 3 is in contact with one energizing piece 521 or one energizing piece 531 to about 1 μm. can.

Further, in the control device 8, when the above-mentioned control is executed, the work identification hanger 4 located at the head of the work newly entered in the electrodeposition tank 1 comes into contact with the energized piece whose voltage application state should be changed. At this point, the state of application of voltage to the energized piece is changed. Therefore, the spark generated by the contact disconnection when the voltage applied state of the energized piece changes is formed on the coating film formed on the dummy work DW held by the work identification hanger 4 in contact with the energized piece. Although it has an adverse effect, it does not affect the coating film formed on the work W held by the work holding hanger 3 following the work identification hanger 4. Therefore, the coating film quality of the work W can be maintained.

Further, the lengths of the plurality of energizing pieces 521 constituting the second energizing bar portion 52 and the lengths of the energizing pieces 531 constituting the third energizing bar portion 53 match the pitch of the hangers (3, 4). There is. Therefore, one hanger (3, 4) is in contact with one energizing piece 521 or the energizing piece 531, and another work holding hanger 3 is attached to the energizing piece with which the work identification hanger 4 is in contact. Not in contact. Therefore, it is possible to avoid a situation in which the work holding hanger 3 is in contact with the energized piece at the time when the voltage application state of the energized piece with which the work identification hanger 4 is in contact is changed. The coating film quality of the work held on the holding hanger 3 can be maintained.

Further, according to the first embodiment, the energization time (energization section) of the second work W2 held by the work holding hanger 3 following the work identification hanger 4 provided with the second work identification member 432 is the energization time (energization section) thereof. Control of the voltage applied state to the energization bar 5 when it is shorter than the energization time (pre-energization section) of the first work W1 (previous work) held by the work holding hanger 3 located immediately before the work identification hanger 4. Is shown. According to this, when the second work W2 held by the work holding hanger 3 following the work identification hanger 4 provided with the second work identification member 432 enters the electrodeposition tank 1, it is currently in the tank. Of the energized pieces to which voltage is applied based on the energization time of the first work W1 (immediately preceding work) (that is, the energized pieces in the previous energized section), the energized pieces that do not need to be applied with voltage (that is, the energized section). The application of the voltage to the outside energized piece) is stopped at the time of contact with the work identification hanger 4. By such control, it is possible to change the energization time to an appropriate level without deteriorating the quality of the coating film formed on the second work W2 held by the work holding hanger 3 following the work identification hanger 4.

Further, according to the second embodiment, the energization time (energization section) of the first work W1 held by the work holding hanger 3 following the work identification hanger 4 provided with the first work identification member 431 is the energization time (energization section) thereof. Control of the voltage applied state to the energization bar 5 when it is longer than the energization time (pre-energization section) of the second work W2 (previous work) held by the work holding hanger 3 located immediately before the work identification hanger 4. Is shown. According to this, when the first work W1 held by the work holding hanger 3 following the work identification hanger 4 provided with the first work identification member 431 enters the electrodeposition tank 1, it is currently in the tank. Of the energized pieces to which voltage is not applied (that is, energized pieces outside the previous energized section) based on the energized time of the second work W2 (immediately preceding work), the energized pieces to which voltage should be applied (that is, in the energized section) The application of the voltage to the energized piece) is started at the time of contact with the work identification hanger 4. By such control, it is possible to change the energization time to an appropriate level without deteriorating the quality of the coating film formed on the first work W1 held by the work holding hanger 3 following the work identification hanger 4.

Further, the number of tanks of the work held by the work holding hanger 3 following the work identification hanger 4 is counted as the number of times the detection signal is input by the count limit switch 105. Then, the control device 8 has a work identification hanger 4 before the count number (number) of the work represented by the input count (count number) of the detection signal by the count limit switch 105 reaches the target count number set for the work. Controls the state of voltage application to multiple energized pieces so that the voltage is applied to the energized pieces that are in contact with the work, and the voltage application to the energized pieces that the work identification hanger contacts is stopped after the target count is reached. do. In this way, by switching the application state of the voltage to the energized piece when the count number reaches the target count number, the workpiece is electrodeposited with an appropriate energization time for the newly-filled workpiece. Can be applied.

Further, as shown in FIG. 5, each energizing piece 521 of the second energizing bar portion 52 of the energizing bar 5 according to the present embodiment has opposite sides (A1, B1) facing the adjacent energizing pieces (521A, 521B). Have. The facing (A1) side overlaps the facing side (B1) of the adjacent energized pieces in the direction perpendicular to the moving direction of the work holding hanger 3 (vertical direction in FIG. 5), that is, the lap section L1 is formed. It is tilted with respect to the direction of movement. Therefore, when the contact copper plate 92 included in the current collector 9 of the work holding hanger 3 passes through the boundary between the adjacent energizing pieces 521A and 521B, it always comes into contact with either of the adjacent energizing pieces.

FIG. 14A is a diagram showing a state in which the contact copper plate 92 of the work holding hanger 3 moves while being in contact with the adjacent energizing pieces 521A and 521B. In FIG. 14A, the contact copper plate 92 moves as shown by the arrow in the figure. Further, the length of the contact copper plate 92 in the moving direction is shorter than the distance L3 between the adjacent energized pieces. When the contact copper plate 92 moves along the arrow in FIG. 14A, the contact copper plate 92 is in contact with only the energizing piece 521A and then passes through the lap section L1 formed at the boundary between the energizing piece 521A and the energizing piece 521B. Then, the state shifts to the state of being in contact with only the energizing piece 521B. Further, in the lap section L1, the vertical length of the contact copper plate 92 is longer than the vertical length L2 of the lap section L1, so that the contact copper plate 92 comes into contact with both energizing pieces 521A and 521B. Therefore, when the contact copper plate 92 moves from the energizing piece 521A toward the energizing piece 521B, the contact copper plate 92 does not go through a state in which it does not come into contact with any of the energizing pieces.

FIG. 14B is a diagram showing a state in which the contact copper plate 92 moves while being in contact with adjacent energized pieces P1 and P2 formed so as to have opposite sides perpendicular to the moving direction. In FIG. 14B, the contact copper plate 92 moves as shown by the arrow in the figure. Further, the length of the contact copper plate 92 in the moving direction is shorter than the distance L3 between the adjacent energized pieces. When the contact copper plate 92 moves along the arrow in FIG. 14B, the contact copper plate 92 changes from the state of being in contact with only the energizing piece P1 to only the energizing piece P2 via the boundary between the energizing piece P1 and the energizing piece P2. It shifts to the contact state. Here, the lap section shown in FIG. 14A is not formed at the boundary between the energizing piece P1 and the energizing piece P2. Further, the distance L3 between both energized pieces is longer than the length of the contact copper plate 92. Therefore, when the contact copper plate 92 moves in the direction from the energized piece P1 to the energized piece P2, the contact copper plate 92 passes through a state in which it is not in contact with any of the energized pieces at the boundary between the two energized pieces.

When the contact copper plate 92 is not in contact with any of the energizing pieces as shown in FIG. 14B, the voltage applied to the contact copper plate 92 is suddenly cut off, or the contact copper plate 92 is contacted. Sparks are generated by the sudden application of voltage. This spark adversely affects the coating film quality of the work held by the work holding hanger 3 provided with the contact copper plate 92. On the other hand, in the present embodiment, as described with reference to FIG. 14A, it is possible to avoid a state in which the contact copper plate 92 is not in contact with any of the energized pieces. Therefore, the occurrence of the above-mentioned defects is avoided, and the quality of the coating film of the work can be maintained.

Although the embodiments of the present invention have been described above, the present invention should not be limited to the above embodiments. For example, in the above embodiment, an example of applying cationic electrodeposition coating to a work has been described, but the present invention can also be applied to an electrodeposition coating apparatus that performs anionic electrodeposition coating. Further, in the above embodiment, an example in which a work newly entered in the electrodeposition tank 1 is identified by using a plurality of limit switches is shown, but the work is formed by another method, for example, using a phototube or the like. It can also be identified. Further, in the above embodiment, an example of controlling the application state of the voltage to the energization bar 5 is shown based on the target count number, but other methods, for example, energization set for the work to be newly filled. The present invention can also be carried out by a method such as directly measuring time. As described above, the present invention can be modified as long as it does not deviate from the gist thereof.

1 ... Electrodeposition tank, 2 ... Conveyor device, 21 ... Conveyance rail (conveyance path), 3 ... Work holding hanger, 4 ... Work identification hanger, 43 ... Work identification member, 43a ... Main body, 43b ... Projection, 43c ... First side surface, 43d ... Second side surface, 431 ... First work identification member, 432 ... Second work identification member, 433 ... Third work identification member, 434 ... Fourth work identification member, 5 ... Energizing bar, 51 ... 1 current-carrying bar part, 52 ... second current-carrying bar part, 521 ... current-carrying piece, A1, B1 ... opposite side, 53 ... third current-carrying bar part, 6 ... diaphragm electrode (counter electrode), 7 ... rectifier (voltage applying device), 8 ... control device, 81 ... control circuit, 82 ... relay, 9 ... current collector, 91 ... current collector arm, 92 ... contact copper plate, 101 ... work identification unit (detection means), 101a ... first limit switch, 101b ... 2nd limit switch, 101c ... 3rd limit switch, 101d ... 4th limit switch, 102 ... switch body, 103 ... actuator, 105 ... count limit switch (counting means), 500 ... electrodeposition coating device, DW ... dummy work, W ... work, W1 ... first work, W2 ... second work, W3 ... third work, W4 ... fourth work

Claims (5)

The electrodeposition tank in which the electrodeposition paint is stored and
A transport path extended in the upper region of the electrodeposition tank and
An energizing bar that is extended along the extending direction of the transport path and is composed of a plurality of energizing pieces divided along the extending direction.
A work holding hanger that is attached to the transport path while holding the work, sequentially contacts the plurality of energized pieces while moving in the extending direction of the transport path, and puts the held work into the electrodeposition tank. When,
The work identification member for identifying the work is provided, and the dummy work is held at the head position of the work holding hanger that holds the work identified by the work identification member, and is attached to the transport path. A work identification hanger that sequentially contacts the plurality of energized pieces while moving in the extending direction of the road and allows the held dummy work to enter the electrodeposition tank.
A detection means for detecting that the work identification member provided on the work identification hanger has passed before the dummy work held on the work identification hanger enters the electrodeposition tank.
The counter electrode arranged in the electrodeposition tank and
A voltage applying device that applies a predetermined DC voltage between the plurality of energizing pieces and the counter electrode,
A control device provided between the plurality of energizing pieces and the voltage applying device and controlling a voltage application state to the plurality of energizing pieces is provided.
The control device is based on the energization time set for the work identified by the work identification member when the work held by the work holding hanger following the work identification hanger enters the electrodeposition tank. Then , the voltage application state to the energized piece whose voltage application state should be changed among the plurality of energized pieces is changed at the time when the work identification hanger is in contact with the energized piece, thereby to the plurality of energized pieces. Electrodeposition coating device that controls the application state of the voltage of. In the electrodeposition coating apparatus according to claim 1,
The control device sets the energization time set for the work held by the work holding hanger following the work identification hanger for the immediately preceding work held by the work holding hanger located immediately before the work identification hanger. When it is shorter than the energization time to be applied, it is based on the energization time set for the immediately preceding work when the work held by the work holding hanger following the work identification hanger enters the electrodeposition tank. Of the energized pieces to which the voltage is applied, the application of the voltage to the energized piece that does not require the application of voltage is stopped at the time when the work identification hanger is in contact with the work to be put into the tank. An electrodeposition coating device that controls the state of application of voltage to the plurality of energized pieces based on the energization time set for. In the electrodeposition coating apparatus according to claim 1 or 2.
The control device sets the energization time set for the work held by the work holding hanger following the work identification hanger for the immediately preceding work held by the work holding hanger located immediately before the work identification hanger. If it is longer than the energization time, it is based on the energization time set for the immediately preceding work when the work held by the work holding hanger following the work identification hanger enters the electrodeposition tank. The energization time set for the work to be filled by starting the application of the voltage to the energized piece to which the voltage should be applied among the energized pieces to which the voltage is not applied at the time of contact with the work identification hanger. An electrodeposition coating device that controls an application state of a voltage to the plurality of energized pieces based on the above. In the electrodeposition coating apparatus according to claim 1 to 3 ,
A counting means for counting the number of works to be put into the electrodeposition tank after the detection means detects the passage of the work identification member is provided.
The control device touches the energized piece with which the work identification hanger comes into contact before the number of works counted by the counting means reaches a preset target count number as the number corresponding to the energization time set for the work. The state of applying the voltage to the plurality of energized pieces is controlled so that the application of the voltage to the energized piece with which the work identification hanger comes into contact after the voltage is applied and reaches the target count number is stopped. Electrodeposition coating equipment. In the electrodeposition coating apparatus according to any one of claims 1 to 4 .
The energized piece has an opposing side facing the adjacent energized piece and has an opposing side.
An electrodeposition coating apparatus in which the facing side is inclined with respect to the moving direction so as to overlap the facing side of the adjacent energized piece in a direction perpendicular to the moving direction of the work holding hanger.

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