JPS6019067A - Painting apparatus - Google Patents

Abstract

PURPOSE:To perform the accurate control of a coating film, by detecting the distribution state of a coating agent, which is coated by a coating agent spray apparatus, by photoelectric converter while controlling the spray amount of the spray apparatus on the basis of the detection signal. CONSTITUTION:In applying a coating agent to the surface of a plate shaped object to be coated by coating agent spray apparatuses 6U, 6L, the distribution state of deposited particles of the coating agent is detected by photoelectric converters 8U, 8L and the spray amount of the coating agent from the coating agent spray apparatuses 6U, 6L on the basis of the detection signal. By this method, a desired thickness is obtained regardless of the feed speed of the object to be coated and the coating control of the coating agent can be performed with high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coating device in which a coating material is sprayed onto a plate-shaped object to be coated, which is generally fed at a required speed, using a coating material spraying device.

Conventionally, as this type of coating equipment, for example, the Utility Model Co., Ltd.
There is a device disclosed in Japanese Patent No. 41796 (name of the invention: Apparatus for electrostatically applying a temperature-controlled solid lubricant), and this is a steel plate that is IG-fed at a required speed.

Q/I21 as a coating material for coated objects such as aluminum plates and copper plates.
1. In order to perform the application process, an application area comprising a sprayer for atomizing the agent, a charging electrode for charging the agent atomized by the sprayer, and an application area for this application. It consists of a special area equipped with a heating roll to spread the moisturizing agent applied on the plate-shaped object onto the object and make it adhere to the object. It is configured to electrostatically apply a lubricant to an object.

Such conventional coating equipment has the advantage of being able to efficiently apply the coating material to a plate-shaped workpiece that is transported at a required speed, but it does not cover the entire surface of the workpiece. In order to form a thin coating film uniformly over the entire area, use a sprayer to apply it! It is necessary to control the feed rate to an optimum value taking into account the feed speed. For this purpose, the amount of coating material volcanic stones of a sprayer has conventionally been controlled in accordance with the general feeding speed of the object to be coated.

However, when controlling the amount of 4A spray applied to a car based only on the IM feed rate, it is difficult to obtain an accurate coating film because the atomization state changes depending on the properties such as the viscosity of the coating material, temperature changes, etc. If formation cannot be carried out and the conveyance speed of the object to be coated is high, it is extremely difficult to measure the amount of coating material actually applied to the object after it has passed through the heating roller. be. In particular, when a lubricant is used as the coating material, the coating thickness is on the order of several microns, so it is completely impossible to visually detect the condition of Coating II9, and failure of the sprayer or charged electrode in the coating area may occur. The reality is that it is not possible to detect abnormalities in the amount of coating agent applied due to

For this reason, when a plate-shaped object to be coated is transported at high speed, a large number of coating defects will occur instantly.
It was not possible to control the painting properly.

Therefore, the present invention has been made to solve the problems of the prior art, and its purpose is to improve the distribution of coating material particles applied to the surface of a plate-shaped object by a coating material spraying device. An object of the present invention is to provide a new coating device that can perform accurate coating management by detecting the amount of paint using a photoelectric conversion device and controlling the amount of coating material sprayed by a coating material spraying device based on the detection signal.

In order to achieve this object, the present invention provides a coating apparatus in which a coating material is sprayed onto a plate-shaped object that is IM-fed at a required speed using a coating+A spray device. After 1., the coating material spraying device is placed in the 1st feeding path of 1. A photoelectric conversion device is provided at a position G where the coating material is applied, and the photoelectric conversion device obtains a detection signal representing the state of adhesion of the coating material to the object to be coated by the cloth material cough mist device, and the coating is performed based on the detection signal. Controls the amount of coating material sprayed by the material spraying device. J: Characterized by sea urchin.

Hereinafter, the present invention will be explained based on a specific embodiment G shown in the drawings.

FIG. 1 is a top view showing an example of a coating apparatus according to the present invention, and FIG. 2 is a process diagram showing an example of a circuit for detecting the amount of coating at the coating port on an object to be coated.

In the figure, 1 is a coating device, and a steel plate, -j? ) A plate-shaped workpiece 2 such as a reminium plate or a copper plate is placed in a chirenz\5 which has a public access room 3 and 4, and the upper part across the movement path of the workpiece 2. At the lower positions, coating material spraying devices 6U and 6L such as lubricating oil are disposed, respectively, and on the right side of these coating material spraying devices 6U and 6L, charged electrodes 7U and 7L to which high voltage is applied to the person are disposed. Further, on the right side of these charging electrodes 7U, 7L, photoelectric conversion type coating material adhesion amount detection devices 8U, 8L for detecting the adhesion state of the coating material are disposed.

The coating material spraying devices 6U and 6L include, for example, as shown in FIG. 3, a coating material reservoir chamber 9 and an overflow reservoir chamber 10 for maintaining the liquid level of the coating material in the coating material reservoir chamber 9 at a constant level.
a coating material storage box 13 equipped with a coating material supply hole 11 and a recovery hole 12 for recovering overflow coating material; Some of it? l? A pick-up roller 15 that is rotated M, and a sprayer 1G that peels off the coating material that has adhered to the surface of the pick-up roller 15 as it rotates and atomizes it by supplied pressurized air.
The amount of the coating material sprayed from the sprayer 16 is controlled by the rotation speed of the pink-up roller 15.

A plurality of these coating material spraying devices 6LI and 6L are arranged in parallel at predetermined intervals in the width direction of the plate-shaped object 2 to be coated, so as to uniformly spray the coating material on both the front and back surfaces of the object 2 to be coated. being done.

In addition, the coating amount detection device 8L1.8L includes, for example, a light source 18 that illuminates the surface of the object 2 to be coated,
A plurality of N CCD image sensors DI are arranged in parallel in the width direction of the object 2 to be coated to detect the reflected light from its surface.
, I)2-1)N and these image sensors D1~
The reading processing circuits F1 to FN sequentially drive each sensor array of DN to read the presence or absence of reflected light in chronological order, and the binary display of "I" indicates that there is reflected light from each reading processing circuit F1 to FN. BCD cow counter G that counts the detection signal by δ1
N, a latch circuit 1-i 1 to I N that latches the J1 value of each counter G1 to GN, and each run number 1,000 times 17311
It consists of an adder circuit 1 that adds the stored contents of 1 to IIN, each read processing circuit F1 to FN, counters G1 to GN, and a control law IIδJ that drives and controls the launch circuits H1 to I(N).

The coating material adhesion amount detection signal outputted from the addition circuit (2) is converted into an analog signal by the D/A conversion circuit, and the analog signal is used to drive and control the drive motor 14 of the coating material spraying devices 6U, 6L. It is supplied to the control circuit 20.

This motor control circuit 20 and coating material amount detection device 8
Detection signals of U and 8L and transport speed detector 2 of object 2 to be coated
Based on the detection signal from 1, the drive motor 14 is controlled to an appropriate rotation speed, and the monthly coating amount from the coating material spraying devices 6U and 6L is adjusted to an appropriate value.

The above is an example of the configuration of the device of the present invention, and its operation will be explained next.

First, the plate-shaped object 2 to be coated is conveyed at a required speed, and the drive motor I4 is driven to coat the coating material spraying devices 6tJ, 6.
The coating material is sprayed from L onto the object 2 to be coated. The atomized coating material particles sprayed from the coating material spraying devices 60, 6L in this manner are charged by the charging electrodes 7U, 7L and electrostatically applied onto the object 2 to be coated.

Here, the applied IA powder particles applied to the object 2 are:
It is adjusted by the amount of pressurized air supplied to the sprayer 16 of the coating material spraying devices 6U and 6L, and the amount of coating material particles adhered is determined according to the rotation speed of the pickup roller 15 by the drive motor I4.

When the object to be coated 2 on which coating material particles have been deposited reaches the position of the coating material amount detection device 8U, OL, these detection devices 8U and 8L detect an amount corresponding to the amount of coating material 01 deposited. A wear amount detection signal is output.

That is, first, the control circuit y outputs the reset signal C2 as shown in FIG. 4(B), and the counters G1 to G
N is reset.

Next, as shown in FIG.
A control signal C1 for driving FN is output. Then, each reading processing circuit F1
~FN is driven, CCD image sensor 1〕1~DN
sequentially scans each sensor array and applies L to each sensor array.
Is it like a plate? ,! ! ! A detection slope signal representing the presence or absence of reflected light from the painted object 2 is output in time series.

In this case, when no coating material particles are attached to the object 2 to be painted facing each sensor array, the irradiated light from the light source 18 is reflected by the surface of the object 20 to be painted, and the reflected light is incident on the sensor array. Therefore, without displaying this, it is displayed as "1" in binary display.
A detection signal is output. Further, when the coating material particles are attached, the irradiated light from the light source 18 is refracted by the coating material particles, so the reflected light does not enter the sensor array, and the binary display indicating this is "0". A detection signal is output.

Among the time-series detection signals output from the reading processing circuits Fl to F'N, the calibration output of rlJ is shown as B in a binary display.
It is counted sequentially by CD counters G1 to GN.

When the counting by these counters G1-GN is completed, the control signal C3 shown in FIG. 4(C) is output from the control circuit J, and the count value of each counter G1-GN is
The data is transferred to and held in the I-IN.

The count values held in each of the launch circuits 111 to HN are added by an adder circuit (2), and a coating material adhesion amount detection signal representing the adhesion amount of coating material particles is output.

After that, the control circuit J outputs a reset signal 02 to reset each counter G1 to GN, and then the control signals CI and C3 are sequentially output, and the operation of detecting the amount of applied material is repeated at short intervals. It will be done.

Detection of monthly application amount output from addition circuit ■ (No. 3 is D
The signal is converted into an analog signal by the /A conversion circuit and supplied to the motor control circuit 20.

Therefore, motor control? a11 circuit 20, object 2 to be painted
Based on the detection signal from the conveyance speed detector 21 of
The rotation speed of the coating material spraying device 4 is changed to adjust the monthly amount of coating material from the coating material spraying devices 6U and 6L, and the amount of coating material applied to the plate-shaped object 2 to be coated is adjusted to a desired value.

In addition, in the above-mentioned embodiment 13, the coating mill spraying device 6U
, 6L has been described using a pick-up roller 15, but in the present invention, any other spraying device such as a hell-type coating material spraying device, a slit-type coating material spraying device, etc. can be applied. In short, any type that atomizes and sprays the coating material may be used.

Further, the coating method is not limited to the electrostatic coating method, and other coating methods may be used.

Further, the configuration of the coating material adhesion amount detection devices 8U and 8L is not limited to the embodiments described above, and other photoelectric conversion devices may be used. When the device 8U-, OL is placed in the chamber 5, by surrounding it with an appropriate cover,
It is sufficient to prevent the adhesion of a coating material such as lubricant oil that is atomized and sprayed, and also to prevent the coating material ((1 piece amount detection device 8U
, 8L may be arranged outside the chamber 5 at a position shown by the chain line in FIG. 1 to prevent the coating material from adhering.

Furthermore, by supplying the output of the adder circuit to a comparison circuit to which a set value is supplied, it is possible to detect a foreign item with a coating material attached thereto.

As described above, according to the present invention, the adhesion state of coating material particles coated on a plate-shaped object by the coating material spraying device is detected by the photoelectric conversion device, and the adhesion state of the coating material particles is detected by the photoelectric conversion device, and the Since the amount of coating material sprayed by the spray device is controlled, it is possible to obtain the desired coating thickness regardless of the conveyance speed of the object to be coated, and at the same time, the amount of coating material sprayed by the spraying device is controlled. This has an excellent effect in that it is possible to detect a failure of the apparatus, and therefore to manage the coating material film with high precision.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an example of a coating device according to the present invention, FIG. 2 is a block diagram showing an example of a coating 4A (Nt adhesion state detection device), and FIG. 3 is a block diagram showing an example of a coating material spraying device applicable to the present invention. A cross-sectional view showing an example, and FIG. 4 is a signal waveform diagram output from the control circuit of the coating material adhesion state detection device shown in FIG. 6L-=-coating material spraying device, 8U, 8L--coating material adhesion amount detection device (photoelectric conversion device). Patent applicant Trinity Industries Co., Ltd.

Claims (1)

[Claims] In a coating device configured to spray a coating material by a coating material spraying device onto a plate-shaped object to be coated that is transported at a predetermined speed, A photoelectric conversion device is disposed at a position where the coating material is applied, and the photoelectric conversion device obtains a detection signal indicating the state of application of the coating material (=J) to the object to be coated by the coating material spraying device, and based on the detection signal, the coating material is 1. A coating device characterized in that the amount of spraying in four layers of a material spraying device is controlled.