JPH0665471U - Electro-deposition coating device - Google Patents

Abstract

(57) [Summary] [Purpose] When performing electrodeposition coating on multiple types of coating objects, position the limit switches that detect when the coating objects are completely submerged in the coating liquid in the electrodeposition tank. The purpose is to start energizing the low-voltage bar reliably when the object to be coated is completely submerged. [Structure] Position detection means 7 for detecting that the coating object W has arrived at a reference position, and until the coating object W is completely submerged in the coating liquid in the electrodeposition tank 4 after reaching the reference position. Storage means 10 for storing the required time of each of them according to the type of the article W to be coated,
A timer 8 which starts timing when the object W to be coated reaches the reference position, a discriminating means 11 for discriminating the type of the object W to be discriminated at the reference position, and an object to be discriminated by the discriminating means 11. The storage means 10 stores the required time according to the type of W.
And a control device 9 for starting energization of the low-voltage power supply bar 5 when the time measured by the timer 8 reaches the required time.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 According to the present invention, an object to be coated which is suspended at a hanger of a conveyor and conveyed at a constant speed is completely submerged in the coating liquid in the electrodeposition tank, and then the hanger is slidably contacted with the low voltage power supply bar to apply the material The present invention relates to an electrodeposition coating device in which energization of an object is started.

[0002]

[Prior art]

 In so-called two-step energization method, after the object to be coated such as automobile body is completely submerged in the paint solution in the electrodeposition tank, energization of the low-voltage power supply bar is started and the voltage is gradually increased to a predetermined voltage. A soft start is performed to improve the quality of the coating film, and a predetermined voltage is applied when the hanger that suspends the object to be coated moves to the high-voltage power supply bar placed after the low-voltage power supply bar. A coating film having a thickness is formed.

In this case, the energization of the low-voltage power supply bar is started when the object to be coated is completely submerged in the coating liquid, and is cut off when the hanger transfers to the high-voltage power supply bar, and the next coating object is applied. It is designed to wait until something arrives. Then, in order to set the timing of starting energization, conventionally, a limit switch or the like is installed at a position where the object to be coated is completely submerged, and the low voltage power supply bar is energized based on the detection signal output from the limit switch. I was trying to get it started.

However, for example, in an automobile production line, since car bodies of various vehicle types are immersed in the same electrodeposition tank provided in one production line for electrodeposition coating, the total length depends on the vehicle type. Not only the total height and the total height, but also the shape of the coupe, sedan, wagon, etc. For this reason, in order to prevent the energization from starting before the object to be coated is completely submerged, the limit switch is set in accordance with the model of the vehicle that is currently being produced on that line that is completely distant from the tank side. I am trying to install it.

[0005]

[Problems to be solved by the device]

 However, in order to adjust the position of the limit switch, the car models produced on the line are actually completely submerged in advance, the complete submersion position is marked on the conveyor rail for each car model, and the electrodeposition tank is inserted. It is very troublesome to determine the type of vehicle that will be completely destroyed at the farthest position from the tank side and install a limit switch according to the completely destroyed position.

Furthermore, when a new vehicle model is to be produced on the line, it is confirmed whether the completely submerged position of the vehicle model is on the front side of the limit switch mounting position, and it is farther than the limit switch mounting position. In that case, the trouble of having to re-install the limit switch each time arises. Therefore, the present invention eliminates the trouble of aligning the limit switches one by one, and does not need to adjust the limit switch mounting position even when a new type of object is to be produced. It is a technical issue to ensure that the energization is started.

[0007]

[Means for Solving the Problems]

 In order to solve this problem, according to the present invention, the hanger is suspended from a hanger on a conveyor and conveyed at a constant speed after the hanger is completely submerged in the coating liquid in the electrodeposition tank. In an electrodeposition coating apparatus in which power is applied to an object to be coated by a low-voltage power supply bar that is in sliding contact with the electrodeposition coating device, position detection means for detecting that the object to be coated entering the electrodeposition tank has reached a reference position, A storage means for storing the time required for the coated object to completely sink into the coating liquid in the electrodeposition tank depending on the type of the coated object, and the coated object A timer that starts timing when the conveyor arrives, continues the timing only while the conveyor is operating, interrupts the timing when the conveyor is stopped, and restarts the timing from the interruption when the conveyor restarts. A discriminating means for discriminating the type of the coating object that has reached the position, and the discriminating hand. Therefore, a control device for reading out the required time corresponding to the type of the object to be coated from the storage means and starting energization to the low-voltage power supply bar when the time measured by the timer reaches the required time is provided. It is characterized by that.

[0008]

[Action]

 According to the present invention, the time required from the arrival of the object to be coated to the reference position until the object is completely submerged in the coating liquid is stored according to the type of the object to be coated, and the object to be coated is placed at the reference position. When it arrives, the type of the object to be coated is discriminated, and the required time corresponding to the type is read from the storage means, and when the time measured by the timer reaches the required time, energization to the low-voltage power supply bar is started. To be done.

In this case, since the time until complete immersion is stored according to the type of the object to be coated, it is possible to accurately know the time when the object is completely immersed according to the type, and to start energization before complete immersion. Never be done. Further, since the timing of starting energization is determined by the time, there is no need to provide a limit switch or the like at the completely submerged position, and therefore, there is no need to adjust the mounting position of the limit switch.

Further, in a normal electrodeposition coating apparatus, when the conveyor is stopped while the object to be coated is immersed in the electrodeposition tank, the object to be coated is prevented from being excessively adhered or remelted. When the conveyor is restarted, the applied voltage is reduced to return to the original voltage value.In this case, the timer of the present invention also interrupts the timing if the conveyor stops during painting, Since the time measurement is restarted from the point when it was restarted, a uniform coating film can be formed on the object to be coated even if the conveyor is stopped.

[0011]

【Example】

 Hereinafter, the present invention will be specifically described with reference to the embodiments shown in the drawings. FIG. 1 is a flow sheet showing an example configuration of the electrodeposition coating apparatus of the present invention.

In the figure, reference numeral 1 denotes an electrodeposition coating apparatus for immersing an object W suspended by a hanger 2 and conveyed at a constant speed by a conveyor 3 in an electrodeposition tank 4 for electrodeposition coating. After the object W to be coated is completely submerged in the coating liquid in the electrodeposition tank 4, a voltage is applied to the object W via a contactor (not shown) formed on the hanger 2 to raise the voltage to a predetermined voltage. A low-voltage power supply bar 5 to be operated and a high-voltage power supply bar 6 which is arranged at a subsequent stage of the low-voltage power supply bar 5 and applies a high voltage to the article W are arranged along the conveyor 3.

A limit switch 7 is a limit switch (position detection device) that contacts the hanger 2 and outputs a switch signal to the timer 8 when the object W to be coated in the electrodeposition tank 4 reaches the reference position. Means). The timer 8 starts timing when the object W to be coated reaches the reference position and a switch signal is output from the limit switch 7, and outputs the timing data to the controller 9. The timer 8 is configured to continue the time counting only while the conveyor is operating, interrupt the time counting when the conveyor is stopped, and restart the time counting when the conveyor is restarted. At times, the timekeeping time is memorized and the timekeeping is restarted when returning.

Further, 10 stores the time required from the arrival of the article W to the reference position until the article W is completely immersed in the coating liquid in the electrodeposition tank 3 according to the type of the article W to be coated. At the same time, the storage means 11 stores the time until the hanger 2 transfers to the high-voltage power supply bar 6, and when the switch signal of the limit switch 7 is output, the storage means 11 refers to a preset transfer order and is used as a reference. It is a discriminating means for discriminating the type of the coating object W that has arrived at the position.

Then, the control device 9 reads from the storage means 10 the time required for the object to be completely submerged according to the type of the object to be coated, which is determined by the determination means 11, and the timer 8 When the time reaches the required time, the energization to the low voltage power supply bar 5 is started, the voltage is boosted to a predetermined voltage, and the power is cut off when the hanger 2 transfers to the high voltage power supply bar 6.

The above is an example of the configuration of the present invention, and its operation will be described below. First, the storage device 10 stores the time required for the object W to reach the reference position until the object W is completely submerged in the coating liquid in the electrodeposition tank 3 in accordance with the type of the object W to be coated. The conveying order of the articles W to be coated is set in the judging means 11, and the articles W to be coated are conveyed by the conveyor 3 at a constant speed in accordance with the order.

When the coating object W arrives at the reference position and the hanger 2 comes into contact with the limit switch 7 and a switch signal is output from the limit switch 7, the timer 8 starts timing and at the same time, the determination means 11 Then, the type of the article to be coated is determined by referring to the transport order of the article to be coated, and the time required until the article W to be completely submerged is read from the storage means 10 according to the type of the article to be coated W found. .

When the time measured by the timer 8 reaches the required time, a control signal is output from the control device 9 to start energizing the low-voltage power supply bar 5, and the voltage is gradually increased until a predetermined voltage is reached. At this time, since the article W to be coated is completely submerged in the coating liquid, energization is not started before the article W is completely submerged. Next, when the hanger 2 transfers from the low-voltage power supply bar 5 to the low-voltage power supply bar 6, the power supply to the low-voltage power supply bar 6 is cut off, and the process waits until the next object W to be coated reaches the reference position.

Therefore, even when the height, length, and shape of the object to be coated W are different, the time until completely submerged in the coating liquid is set according to the type of the object to be coated. Regardless of the type of material, it is possible to start energizing the low-voltage power supply bar when the object to be coated is completely submerged.

It should be noted that the position detecting means of the article W that has arrived at the reference position is not limited to the limit switch 7, and any sensor can be adopted. Further, the determination means 11 for determining the type of the article to be coated W is not limited to the case where the determination is made by referring to the preset transportation order of the article to be coated, and for example, an optical means such as an optical sensor or an image sensor. Any means such as can be adopted. Furthermore, as a means for detecting the time when the coating object W has transferred from the low-voltage power supply bar 5 to the high-voltage power supply bar 6, the case in which the time to transfer is used and the detection is performed based on this is explained. A limit switch or other detection means may be provided in the.

[0021]

[Effect of device]

 As described above, according to the present invention, the timing for starting energization of the low-voltage power supply bar is determined by the time from when the object to be coated reaches the reference position until it is completely submerged in the coating liquid. Therefore, it is not necessary to install a limit switch even when painting multiple types of objects, and therefore when aligning the mounting position or painting a new type of object. No need to adjust the position of the limit switch, and even if the height, length and shape of the object W are different, the object is completely submerged regardless of the type of object. It has an excellent effect that it is possible to start energizing the low-voltage power supply bar at that time.

[Brief description of drawings]

FIG. 1 is a flow sheet showing an example configuration of the present invention.

[Explanation of symbols]

 W ... Object to be coated 1 ... Electrodeposition coating device 2 ... Hanger 3 ... Conveyor 4 ... Electrodeposition tank 5 ... Low-voltage power supply bar 6 ... High-voltage power supply bar 7. ..Limit switches (position detection means) 8 ... timer 9 ... control device 10 ... storage means 11 ... discrimination means

Claims (1)

[Scope of utility model registration request] 1. An object to be coated (W) which is suspended on a hanger (2) of a conveyor (3) and conveyed at a constant speed is an electrodeposition tank (4).
In the electrodeposition coating apparatus, the low voltage power supply bar (5) with which the hanger (2) is in sliding contact with the work piece (W) starts energization after it is completely submerged in the coating liquid inside the electrodeposition tank. Position detection means (7) for detecting that the article to be coated (W) to be placed in (4) has arrived at the reference position, and the electrodeposition vessel (7) after the article to be coated (W) has arrived at the reference position. 4) Storage means (10) for storing the time required to completely submerge in the coating liquid in accordance with the type of the article to be coated (W), and timing when the article to be coated reaches the reference position. The timer (8) that restarts the clocking when the conveyor is in operation, continues the clocking only when the conveyor is operating, interrupts the clocking when the conveyor is stopped, and restarts the timing when the conveyor (3) restarts, and the reference position The discriminating means (11) for discriminating the type of the object to be coated (W) that has arrived, and the discriminating means (11), The required time corresponding to the type of the article to be coated (W) is read from the storage means (10), and when the time measured by the timer (8) reaches the required time, the low voltage power supply bar (5) is supplied. An electrodeposition coating apparatus comprising a control device (9) for starting energization.