JPS6059020B2 - Paint discharge amount control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paint discharge amount control device that selects an optimum paint discharge amount under various coating conditions and supplies the selected paint discharge amount.

Paint has different physical properties such as viscosity depending on the color, and is also greatly affected by temperature, so the paint discharge pressure is changed according to changes in these parameters to control the paint discharge amount to the optimal value. Must.

Furthermore, when painting an automobile body that is being conveyed by a conveyor, the area to be coated and the paint flight distance will vary depending on the parts to be coated, such as the front fender, door, rear fender, etc. The discharge rate must be controlled. As an example of a paint discharge amount control device that responds to changes in these parameters, an invention disclosed in Japanese Patent Application No. 54-1213L (Japanese Patent Application No. 56-4) was filed by the same applicant as the present patent application.
5779, Publication No. 5779) has been proposed. In the invention of Patent Application No. 11213/1997, there is a central processing unit that calculates the optimum paint discharge amount according to changes in the viscosity of the paint, and the output of this central processing unit is used to calculate the electro-pneumatic A technical concept is disclosed in which an air-operated paint discharge amount control valve is operated via a conversion device to control the paint discharge amount to an optimum value. However, the central processing unit invented in Japanese Patent Application No. 54-1213L was based on the concept of individually setting the optimal paint discharge amount, so while it was possible to control the discharge amount at a high level, the central processing unit There was a risk that the configuration would become complicated and difficult to configure. The present invention provides a paint that simplifies the central processing unit and facilitates settings by performing calculations in the central processing unit using a digital quantity multiplication circuit, and also maintains a high level of control performance. An object of the present invention is to provide a discharge amount control device.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the paint discharge amount control device of the present invention will be described below with reference to the drawings.

Figure 1 shows the entire system of the device, where 1 is the rotating atomizing head of the electrostatic coating machine, 2 is the discharge receiver for cleaning liquid, etc., and 3 is the rotary atomizing head of the electrostatic coating machine.
is a switching valve that selectively sends paint, cleaning liquid, or air to either the coating machine 1 side or the discharge side.

4 indicates the color change valve group, of which 4
A to 4N are valves for selecting paint colors A, B, . . . , N, 4P is a cleaning liquid valve, and 40 is an air valve.

The color change valve 4 has a pressure pipe 5A for supplying paint.
The paint is supplied from the pipes 5N to 5N, and the cleaning liquid or air is supplied from the cleaning liquid pressure-feeding pipe 6 and the main factory air pipe 7. Air-operated flow control valve 8 is installed on the paint supply pipe.
A, 8B, . . . , 8N are provided, and a digital electric signal emitted from the central processing unit 10 is converted into an air signal by an electro-pneumatic converter 9, and this air signal is used to control the flow rate control valves 8A, 8B, . 8N is activated to control the flow rate of paint.

The internal configuration of the central processing unit 10 is shown in a block diagram as shown in FIG.

That is, the color to be painted is stored in the paint color storage section 11, and the signal is sent to the color change valve 4 to open the color change valve 4 corresponding to that color, and the paint color discharge amount standard setting tape is sent to the color change valve 4. Sent to 12th. In the paint color discharge amount standard setting tape 12, there are regions A, . According to the selected paint color, the optimum paint discharge rate corresponding to the paint color is selected.This output signal is sent to the first multiplication circuit 1.
Sent to 3. On the other hand, the body storage section 14 stores the shape of the body of the vehicle to be coated.

As shown in Fig. 3, the body includes a front fender 15,
Front fender to body transition part 16, door 17,
Transition part 18 from door to rear fender, rear fender 1
The area to be coated differs depending on the number 9, and the area to be coated changes as the area to be coated moves as it is transported by the conveyor. The transfer speed of the conveyor is detected by a conveyor synchronization pulse 20, which is converted into an appropriate electrical signal by a conveyor synchronization signal 21 and sent to the body calculation circuit 2.
Guided by 2. In response to the signal from the body storage section 14 and the signal from the conveyor synchronization signal 24, the body calculation circuit 22 calculates which part of the body is being painted, and this signal is sent to the painting area setting table 23 and is The optimal paint discharge rate matching the coating area of the part to be coated is selected and sent to the first multiplication circuit 13. As shown in FIG. 4, the multiplication circuit 13 calculates the optimum paint discharging rate for the selected paint color, for example C color, and the calculated optimum paint discharging rate corresponding to the painted area of the painted area, for example 15. The output signal is multiplied to calculate the optimum paint ejection rate taking both parameters into consideration, and the output signal is sent to the second multiplication circuit 24.

24 is a temperature-dependent paint viscosity change setting device.

Temperature parameters are also divided into multiple regions, and an optimal paint discharge rate is determined for each region.When a certain temperature is set, the second multiplication circuit calculates the optimal paint discharge rate for the area that includes the temperature. Sent to 24th. In the second multiplication circuit 24, the optimum paint discharge rate sent from the first multiplication circuit 3 is multiplied by the optimum paint discharge rate sent from the viscosity change setting device 25, and the output value is converted into an electro-pneumatic conversion. It is sent to the flow rate control valve 8 via the device 9.

Parameters such as paint color, coating area, temperature, conveyor speed, paint viscosity and other physical properties, shaving air, voltage fluctuation, and rotation speed are set using rotary switches. As shown in FIG. 5, all that is required is to set the arrow on the switch 26 to an arbitrary color, for example C, so that automatic setting can be easily performed.

In the paint discharge amount control device having the above configuration, by operating rotary switches for parameters such as paint color, coating area, temperature, etc., and specifying the appropriate area for each parameter, the optimum area corresponding to the parameter area can be set. The paint discharge rate is determined as a digital quantity, and these digital quantities are multiplied by multiplication circuits 13 and 24 to determine the optimum paint discharge rate as a whole.

Since each parameter is divided into a plurality of areas in this way, advanced control can be performed without setting all the parameters individually. When using the paint discharge amount control device according to the present invention, it is possible to control the paint discharge according to the color, coated area, and temperature using a multiplication circuit, and it is possible to digitally design the device, simplifying the design and manufacturing of the device. can be achieved.

Further, if the coefficient values of the designated areas of each parameter are set using a rotary switch method, the setting becomes extremely easy.
Incidentally, the coefficient value of the designated area of each parameter may be set by measuring the coated area, paint flow rate (temperature), etc., and calculating the ratio thereof.

[Brief explanation of drawings]

Fig. 1 is an overall system diagram of the paint discharge amount control device of the present invention, Fig. 2 is a block diagram of the central processing unit of the device shown in Fig. 1, and Fig. 3 is a schematic front view showing parts of an automobile body to be coated. 4 is a multiplication circuit diagram, and FIG. 5 is a front view of the rotary switch. 1... Painter, 4... Color change valve, 8... Flow rate control valve, 10... Central processing unit, 11... Paint color memory section, 12.
...Painting color discharge amount standard setting table, 13...
...First multiplication circuit, 14...Body storage section, 20
... Conveyor synchronization pulse, 21 ... Conveyor synchronization signal, 22 ... Body calculation circuit, 23.
. . . Painting area setting table, 24 . . . Second arithmetic circuit, 25 . . . Viscosity change setting device, 26.
...Rotary switch.

Claims (1)

[Scope of Claims] 1. A central processing unit calculates the optimum amount of paint to be discharged according to parameters such as paint color, temperature, area to be coated, etc. A paint discharge rate control device for controlling a discharge rate, wherein the central processing unit divides the parameters into a plurality of regions, determines the optimum paint discharge rate for each region, and determines the optimum paint discharge rate for each region. A paint discharge amount control device comprising a multiplication circuit that obtains an optimum paint discharge amount by multiplying the optimum paint discharge ratios of each region of each parameter corresponding to the state. 2. The paint discharge amount control device according to claim 1, in which setting of the optimum paint discharge rate for each parameter region is achieved by adjusting the scale of a rotary switch or the like. 3. In the paint discharge amount control device according to claim 1, the optimum paint discharge rate is set by measuring the coated area with a phototube or the like, calculating the ratio with the reference value, and using the calculated value. what is achieved. 4. The paint discharge amount control device according to claim 1, which detects the paint flow rate, calculates its ratio with a reference value, and achieves this by using the calculated value.