JPS6348697Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is used in the technical field of electro-deposition coating equipment for car bodies. The present invention relates to an electro-deposition coating device used in mixed production, which controls the coating film thickness to obtain a suitable product.

(Prior art) In general, in continuous electrocoating of car bodies, only the same car models are sent to one painting line including an electrodeposition tank, and different car models are painted on separate paint lines. It is customary to Therefore, if car bodies of different types are mixed on the same painting line, there is a problem that each car body will be painted with a uniform coating thickness regardless of the paint quality, making it impossible to obtain an appropriate product. It was hot.

Therefore, when the car body to be painted enters the electrodeposition tank, there are methods that soft-start the voltage of the electrode near the tank to apply a thin coat (for example, see Japanese Patent Publication No. 49-2968), and Those that control the coating film thickness by changing the immersion area (for example, JP-A-52-
127947) is known.

(Problems to be Solved by the Invention) However, none of the above-mentioned publications can cope with the case where car bodies of different types are all sent to a painting line and the coating film thickness is controlled.

For this reason, in the past, in order to simultaneously paint car bodies with different paint quality, such as luxury cars, mass-market cars, and luggage cars, multiple painting lines were required, which not only resulted in large equipment costs; There was a problem in that it required a large installation area.

(Purpose of the invention) In view of the above-mentioned conventional problems, the present invention uses a sensor to determine the type of car body of a different type of car. It is an object of the present invention to provide an electrodeposition coating device for mixed production, which can obtain an appropriate coating thickness by controlling electrodeposition properties so as not to create an excessive coating thickness.

(Structure of the invention) In order to achieve the above object, the structure of the invention is to install an electrodeposition bath on a conveyance line that conveys multiple types of car bodies, and to immerse the car body in the electrodeposition bath to deposit the car body by electrodeposition. Targets electro-deposition coating equipment that performs painting. and a shielding plate attached to a part or all of one side of the electrode provided on both sides in the electrodeposition bath to shield part or all of one side of the electrode, and connected to the electrode, A rotating device for rotating the electrode by at least 180 degrees, and a vehicle type detection sensor installed at a position on the transfer line of the electrodeposition tank before entering the tank and detecting the type of vehicle entering the electrodeposition tank are provided. Furthermore, the vehicle type is determined based on the signal from the vehicle type detection sensor,
In the case of a car body with a thicker electrodeposition coating, the non-shielded side of the electrode is placed facing the car body, and in the case of a car body with a thinner electrodeposition coating, the shielded side of the electrode is placed in a position facing the car body. and a discrimination device that outputs an operation signal to the rotating device to set the position of each electrode.

(Function) As a result, in this invention, if the car body entering the electrocoating tank is a luxury car or other car body that requires a thick electrocoating film, the car type detection sensor detects this and the discrimination device discriminates it. Then, in response to an operation signal from the discriminating device, the rotating device sets the electrode at a position where its non-shielded side faces the vehicle body. As a result, since the electrodepositivity of the electrodes is not inhibited, the car body that enters the tank is coated with a thick layer of electrodeposition.

On the other hand, if the car body entering the tank is a car body with a thin electrodeposition coating, such as a popular car, it is detected by a car type detection sensor, discriminated by a discrimination device, and then processed by receiving an operation signal from the discrimination device. The moving device positions the electrode so that its shielding side faces the vehicle body. As a result, the electrodepositivity of the electrode decreases, so that the car body that enters the tank is coated with a thin layer.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

As shown in FIG. 1, the electrodeposition coating apparatus 1 includes a conveyance line 2, an electrodeposition tank 3, a rotation device 4, and a vehicle type detection sensor 5.
and a discrimination device 6 are the main parts of the configuration.

The transport line 2 is provided with a rail 7, and a mixture of luxury car bodies 9 and mass-market car bodies 10 are suspended from hanging tools 8, 8 moving on the rails 7.

In the electrodeposition tank 3, 15 to 20 electrodes (anodes) are usually provided at predetermined intervals on the left and right sides (see FIG. 2) in the electrodeposition liquid 11 in the tank. In Fig. 1, the number of electrodes is reduced on one side only, but 12a, 12b, and 12c are rotary electrodes that can control electrodeposition, and 12d, 12e, and 12c are rotating electrodes that can control electrodeposition.
2f and 12g are fixed electrodes that always maintain constant electrodeposition. The rotating electrodes 12a, 12
A shielding plate 13 is attached to the upper half of one side of the electrodes 12b and 12c to cut off current to the electrodes, and a rotating shaft 14 protruding upward from each rotating electrode 12a, 12b, 12c is connected to the electrodeposition tank 3. Bracket 15 provided at the upper end
pinions 16, 16, 16 are respectively fixed to the upper end of the rotating shaft 14, and a rack 17 meshed with the pinion 16 and the pinion 16 is connected to one end of the rack. The rotating device 4 is constituted by a driving means 18 such as a solenoid and a motor.

Further, a vehicle type detection sensor 5 for detecting the vehicle type is provided at a position before the transfer line 2 of the electrodeposition tank 3 enters the tank, and a discriminating device 6 is provided for the vehicle type detection sensor 5.
The discriminating device 6 receives a detection signal from the vehicle type detection sensor 5 and discriminates it.
The non-shielded side surfaces of the rotating electrodes 12a, 12b, 12c are opposed to each other so that the non-shielded side faces of the rotating electrodes 12a, 12b, and 12c face the vehicle body 9.
0 (see Figure 2)
An operation signal is output to the rotation device 4 to control the position of the rotation electrodes 12a to 12c. The vehicle type detection sensor 5 employs, for example, a phototube, and reads a code tag pasted on the vehicle body, or detects it through a hole drilled in the vehicle body. In addition, in order to more effectively prevent excessive coating thickness or linear coating that often occurs when entering the tank, and to set an appropriate electrodeposition time, a limit switch and timer should be installed. is desirable. Reference numeral 19 denotes a power source, with the negative terminal connected to each of the vehicle bodies 9 and 10, and the positive terminal connected to the electrodes 12a to 12g.

Next, the operation of the apparatus of the above embodiment will be explained.

In order to make the rotating electrodes 12a, 12b, 12c have the same electrodeposition properties as the fixed electrodes 12d, 12e, 12f, 12g, the rotating device 4 is activated to remove the shielding plate 13 from a non-stick surface. Keep the shield sides facing each other. When the car bodies 9 and 10 on the conveyance line 2 are moving toward the electrodeposition tank 3, if the car type detection sensor 5 detects a luxury car body 9 whose electrodeposition coating film thickness is thick, the car type is detected. Upon receiving the signal from the sensor 5, the discriminating device 6 discriminates the vehicle type, and the rotating device 4
does not operate, the rotating electrodes 12a, 12b, 1
2c are left with their non-shielded sides facing each other. Therefore, since the electrodeposition properties of the rotating electrodes 12a to 12c are not inhibited, the high-quality car body 9 placed in the tank is coated with a thicker and higher quality electrodeposited coating on all the electrodes 12a to 12g.

Next, if the vehicle body entering the tank is a mass-market vehicle body 10 with a thinner electrodeposition coating film, the vehicle type detection sensor 5 and discrimination device 6 identify the mass-market vehicle body 10 in the same manner as described above, and the vehicle rotates based on the signal. When the device 4 is activated, the rotating electrodes 12a, 12b, and 12c are rotated by 180 degrees so that the shielding side surfaces to which the shielding plates 13 are attached face each other. Therefore, the electrodepositivity of the rotating electrodes 12a to 12c is reduced, so that the rotating electrodes 12a to 12c are mainly used as the fixed electrodes 12.
d, 12e, 12f, and 12g, the mass vehicle body 10 is coated with a thin film thickness.

The car bodies 9 and 10 that have been electrocoated move on the conveyance line 2 and rise from the electrodeposition tank 3, and then are sent to a washing device (not shown).

An example of the coating conditions in the above example is as follows:
It is as follows.

Voltage: 300±20V Energizing time: 3 to 4 minutes Paint concentration: 20±1% Paint film thickness: 25μ for luxury car body outer panels, 10μ for mass car body outer panels Note that the rotating electrodes 12a, 12b, and 12c are shielded. If necessary, a material plate may be attached to the entire surface of one side of the rotating electrodes 12a to 12c, or all electrodes 12a to 12g may be replaced with rotating electrodes, as shown by chain lines in FIG. . Further, in the above embodiment, the rotating electrodes 12a, 12b, 12c and the fixed electrodes 12d, 12e, 12f, 12g are arranged in two groups, a rotating electrode group and a fixed electrode group. Alternatively, rotating electrodes and fixed electrodes may be arranged alternately from the tank entry side of each vehicle body 9, 10. Furthermore, the objects to be coated are not limited to the respective vehicle bodies 9 and 10, but may be replaced with other articles.

In the above embodiment, the vehicle body is the cathode and the electrode is the anode, but the polarities may be reversed.

(Effects of the invention) Since the present invention has the above-mentioned configuration, even if various car bodies with different painting qualities are sent to the same painting line, the car type is detected by the car type detection sensor, the discrimination device is used to distinguish the car type, and the rotary device is used to make the electrodes. By rotating the electrode and controlling the electrodepositivity of the electrode, it is possible to continuously identify various types of car bodies and form the appropriate paint film thickness depending on the car model, thereby preventing excessive paint quality. This has the excellent effect of enabling rational coating production.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the present invention, and FIG. 1 is a front view of the main parts of an electrodeposition coating device in mixed production,
The figure is a side view enlarged along the - line in Figure 1;
FIG. 3 is a plan view of the rotating device. DESCRIPTION OF SYMBOLS 1...electrodeposition coating device, 2...conveyance line, 3...electrodeposition tank, 4...rotation device, 5...vehicle model detection sensor, 6...discrimination device, 9...luxury car body, 10...popular car body, 1
2a, 12b, 12c...Rotating electrode, 12d, 12
e, 12f, 12g...fixed electrode, 13...shielding plate.

Claims (1)

[Scope of Claim for Utility Model Registration] An electrodeposition coating apparatus that includes an electrodeposition tank installed on a conveyance line for transporting multiple types of vehicle bodies, and performs electrodeposition coating on the vehicle body by immersing the vehicle body in the electrodeposition tank, comprising: a shielding plate that is attached to a part or all of one side of the electrode provided on both sides of the electrodeposition bath to shield part or all of one side of the electrode; and a shielding plate that is connected to the electrode and covers at least one side of the electrode. a rotation device that rotates 180 degrees; a vehicle type detection sensor that is provided at a position on the transfer line of the electrodeposition tank before the tank enters the tank and detects the type of vehicle entering the electrodeposition tank; The vehicle type is determined based on the signal received, and in the case of a vehicle body with a thick electrodeposition coating film, the non-shielded side of the electrode is placed in a position facing the vehicle body.
In the case of a vehicle body in which the thickness of the electrodeposited coating is reduced, a discriminating device is provided that outputs an operation signal to the rotation device in order to set the position of each electrode so that the shielding side of the electrode faces the vehicle body. Electrodeposition coating equipment for mixed production, which is characterized by: