JPH0647568Y2 - Paint supply equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a paint supply device, and more particularly, to an improvement of a device for supplying metallic paint to paint an object to be coated.

(Prior Art) Conventionally, as a paint supply device of this type, for example
As disclosed in Japanese Patent Laid-Open No. 59-115454, the metallic paint contained in a paint tank is circulated by the operation of a circulation pump and spray-painted on an object to be coated, such as the body of an automobile. It is generally well known that the Al particles in the paint are prevented from settling.

Further, in such a paint supply device, a replenishment tank is provided, and when the metallic paint contained in the paint tank is reduced to a certain amount or less as the painting work progresses, the replenishment tank is placed in the paint tank. It is usually practiced to replenish the metallic paint for replenishment from the above to prevent a rapid change in color tone and the like so that the quality is not adversely affected.

(Problems to be solved by the invention) By the way, in the above-mentioned conventional paint supply device, when the metallic paint is circulated by the operation of the circulation pump, a high pressure acts on the metallic paint to deform the Al particles in the metallic paint. There is a risk. The degree of deformation of the Al particles is relatively small when the residence time of the metallic paint in the paint tank is short, but there is no problem, but due to a decrease in the amount of the object to be coated, etc., the paint supply amount within a predetermined time decreases and the metallic When the paint stays in the paint tank for a long time, it tends to increase, and when the degree of deformation of the Al particles increases in this way, there is a problem that deterioration of the so-called metallic paint that changes in color tone occurs. there were.

The present invention has been made in view of such a point, and its purpose is to provide an extraction tank and take appropriate means to extract the metallic paint in the paint tank according to the painting work. Even if the quantity decreases,
By avoiding the metallic paint staying in the paint tank for a long time, it is possible to prevent the Al particles in the metallic paint from being deformed by the high-pressure action of the circulation pump, which changes the color tone. The purpose is to prevent the deterioration of metallic paint.

(Means for Solving the Problem) In order to achieve the above-mentioned object, the solution means of the present invention is intended for a device for supplying a metallic paint to an object to be coated, in which case the metallic paint is contained. And a circulation pump for circulating the metallic paint contained in the paint tank. Further, a replenishment tank for accommodating the metallic paint for replenishment to be replenished in the paint tank and an extraction tank for accommodating the metallic paint extracted from the paint tank are provided. Also,
When the contained amount of the metallic paint contained in the paint tank becomes a certain amount or less, while supplying the metallic paint for replenishment from the replenishment tank to the paint tank, the metallic paint contained in the paint tank When the amount of decrease does not reach a certain amount within a predetermined time, a control means for controlling the metallic paint in the paint tank to be drawn into the drawing tank is provided.

(Operation) With the above configuration, in the present invention, the metallic paint contained in the paint tank is supplied to the object to be coated while being circulated by the operation of the circulation pump. Then, when the amount of the metallic paint contained in the paint tank becomes less than a certain amount, the metallic paint for replenishment is replenished from the replenishment tank into the paint tank while the metallic paint contained in the paint tank is replenished. When the decrease amount of the paint does not reach a certain amount within a predetermined time, the control means controls the metallic paint in the paint tank to be drawn into the drawing tank.

This prevents the metallic paint from staying in the paint tank for a long time due to a decrease in the amount of the object to be coated, etc., which allows Al particles in the metallic paint to be deformed by the high-pressure action of the circulation pump. Therefore, it is possible to prevent the deterioration of the metallic paint whose color tone is changed.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a paint supply device according to an embodiment of the present invention for supplying metallic paint A to an object to be coated such as an automobile body. Reference numeral 1 denotes a paint tank that contains the metallic paint A. A supply pipe 2 and a circulation pipe 3 are connected to the bottom wall of the paint tank 1, and a supply pump 4 is connected to the supply pipe 2. A coating gun 5 is installed at its downstream end.
Are connected. The metallic paint A stored in the paint tank 1 by the operation of the supply pump 4
As indicated by a black arrow, the pressure is supplied to the coating gun 5 through the supply pipe 2, and the metallic paint A is spray-coated onto the object to be coated from the coating gun 5. On the other hand, a first solenoid valve 6, which is a three-way switching valve, a circulation pump 7, a filter 8 and a second solenoid valve 9, which is a three-way switching valve, are sequentially provided in the circulation pipe 3 from the upstream side to the downstream side. , The upstream side and the downstream side of the circulation pipe 3 are made to communicate with each other by the switching operation of the first solenoid valve 6 and the second solenoid valve 9, and the circulation pipe 3 and the replenishment pipe 12 and the extraction pipe 14 which will be described later. In a state in which the above are cut off, the metallic paint A contained in the paint tank 1 is circulated by the operation of the circulation pump 7 as indicated by a black arrow.

Further, 10 is a replenishment tank for containing replenishment metallic paint A'which is replenished in the paint tank 1, and a third solenoid valve 11 which is a three-way switching valve is provided on the bottom wall of the replenishment tank 10. The established replenishment pipe 12 is connected,
Moreover, the supply pipe 12 is connected to the first solenoid valve 6 of the circulation pipe 3. Then, from the valve switching state in which the metallic paint A is circulated, the upstream side and the downstream side of the circulation pipe 3 are shut off by the switching operation of the first solenoid valve 6, and the circulation pipe 3 and the replenishment pipe are A state in which the replenishment pipe 12 is communicated with the upstream side and the downstream side of the replenishment pipe 12 by the switching operation of the third solenoid valve 11, and the replenishment pipe 12 and the recirculation pipe 15 described later are cut off. Then, the metallic paint A'for replenishment stored in the replenishment tank 10 by the operation of the circulation pump 7 is supplied to the paint tank 1 through the replenishment pipe 12 and the circulation pipe 3 as shown by a dashed arrow. It is designed to replenish.

Further, 13 is a withdrawal tank for containing the metallic paint A withdrawn from the paint tank 1, to which withdrawal pipe 14 is connected, and the withdrawal pipe 14 is connected to the circulation pipe 3. It is connected to the second solenoid valve 9. A recirculation pipe 15 is connected to the bottom wall of the extraction tank 13, and the circulation pipe 15 is connected to the third solenoid hull 11 of the replenishment pipe 12. Then, from the valve switching state in which the metallic paint A is circulated, the upstream side and the downstream side of the circulation pipe 3 are shut off by the switching operation of the second solenoid valve 9,
The paint tank 1 is operated by operating the circulation pump 7 while the circulation pipe 3 and the extraction pipe 14 are in communication with each other.
The metallic paint A contained therein is extracted and contained in the extraction tank 13 through the circulation pipe 3 and the extraction pipe 14 as shown by the white arrow. On the other hand, the metallic paint A contained in the extraction tank 13 is moved from the valve switching state in which the metallic paint A is circulated to the upstream side and the downstream side of the circulation pipe 3 by the switching operation of the first solenoid valve 6. While shutting off and switching the third solenoid valve 11 to connect the downstream side of the circulation pipe 3, the replenishment pipe 12 and the circulation pipe 15 to each other, as shown by the white arrow, the circulation pump 7 Is operated to recirculate into the paint tank 1 through the circulation pipe 15, the replenishment pipe 12, and the circulation pipe 3.

Further, in each of the paint tank 1, the replenishment tank 10 and the withdrawal tank 13, a stirring device 16 for stirring the contained metallic paint A and the replenishing metallic paint A '.
And a liquid level sensor 17 for detecting the liquid level are respectively arranged, and each liquid level sensor 17 is input-connected to a control device 18 described later. Then, when the liquid level in the paint tank 1 is lowered and the amount of the metallic paint A accommodated becomes a certain amount or less, a detection signal of the liquid level sensor 17 which detects this is input to the control device 18, whereby The replenishment tank is operated by switching the first to third solenoid valves 6, 9 and 11.
The replenishment metallic paint A'in 10 is replenished into the paint tank 1 through the replenishment pipe 12 and the circulation pipe 3. Further, when the liquid level in the replenishing pipe 12 is lowered and the amount of the replenishing metallic paint A'contained is below a certain amount, a detection signal of a liquid level sensor 17 which detects this is input to the control device 18. As a result, the metallic paint A'for replenishment is supplied from a supply source (not shown) to be contained therein. Furthermore, when the liquid level in the extraction tank 13 rises and the amount of the metallic paint A contained exceeds a certain amount, the detection signal of the liquid level sensor 17 that detects this is input to the control device 18, and as a result, The first to third solenoid valves 6, 9 and 11 are switched to stop the extraction of the metallic paint A from the paint tank 1.

Further, 18 is the first to third solenoid valves 6, 9, 11 described above.
When the amount of the metallic paint A contained in the paint tank 1 falls below a certain amount, a control device as a control unit for controlling the operation of the liquid level sensor 17 detects this. Based on the above, the replenishment metallic paint A ′ is replenished from the replenishment tank 10 into the paint tank 1. On the other hand, the reduction amount of the metallic paint A stored in the paint tank 1 is constant within a predetermined time due to, for example, a decrease in the amount of the object to be coated, an increase in the coating stop time, or a failure of the object-conveying device or the like. If the amount is not reached, the liquid level sensor 17 does not operate, and the controller 18 detects an inoperative state within this predetermined time,
Extract the metallic paint A in the paint tank 1 from the above tank
1st to 3rd solenoid valves 6,9,
It is designed to control the operation of 11.

As described above, in the present embodiment, the metallic paint A contained in the paint tank 1 is supplied to the coating gun 5 so as to be applied to the object to be coated while being circulated through the circulation pipe 3 by the operation of the circulation pump 7. To do. When the amount of the metallic paint A contained in the paint tank 1 becomes less than a certain amount, the metallic paint A for replenishment is replenished from the replenishing pipe 12 into the paint tank 1 while the metallic paint A is replenished. When the decrease amount of the metallic paint A stored in the paint tank 1 does not reach a certain amount within a predetermined time, the control device 18 draws the metallic paint A in the paint tank 1 into the sampling tank 13 through the first to the first. 3 Control the operation of solenoid valves 6, 9 and 11.

From this, the metallic paint A is prevented from staying in the paint tank 1 for a long time due to a decrease in the amount of the object to be coated, and the Al particles in the metallic paint A are deformed by the high pressure action of the circulation pump 7. Can be prevented as much as possible,
Therefore, it is possible to reliably prevent the deterioration of the metallic paint A whose color tone or the like changes.

(Effect of the Invention) As described above, according to the present invention, when the amount of the metallic paint circulated by the operation of the circulation pump in the paint tank becomes less than a certain amount, the paint tank is replenished. While replenishing the metallic paint for replenishment from the tank, if the reduction amount of the metallic paint stored in the paint tank does not reach a certain amount within a predetermined time, remove the metallic paint in the paint tank and extract it to the tank. Since it is controlled, it is possible to prevent the metallic particles from being deformed as much as possible due to the metallic paint remaining in the paint tank for a long time, and it is possible to reliably prevent the deterioration of the metallic paint.

[Brief description of drawings]

FIG. 1 is an overall schematic configuration diagram of a paint supply device according to an embodiment of the present invention. 1 ... Paint tank 7 ... Circulation pump 10 ... Replenishment tank 13 ... Extraction tank 18 ... Control device (control means) A ... Metallic paint A '... Replenishment metallic paint

Claims (1)

[Scope of utility model registration request] 1. A device for supplying a metallic paint to an object to be coated, the paint tank containing the metallic paint, and a circulation pump for circulating the metallic paint contained in the paint tank. A replenishment tank that contains the metallic paint for replenishment that is replenished in the paint tank, an extraction tank that contains the metallic paint that is extracted from the paint tank, and a fixed amount of the metallic paint that is contained in the paint tank. When the amount becomes less than
When the metallic paint for replenishment is replenished from the replenishment tank to the paint tank, and the reduction amount of the metallic paint contained in the paint tank does not reach a certain amount within a predetermined time, the metallic paint in the paint tank And a control means for controlling so as to extract into the extraction tank.