JPH0143196Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention comprises a paint supply device, in particular a main tank equipped with a temperature control means, a paint supply pump for supplying the paint in the main tank to a paint consumption device, and a paint supply pump for supplying the paint to the main tank. The present invention relates to a paint supply device including a sub-tank for replenishment.

Conventionally, in such paint supply devices, the amount of paint in the main tank, whose temperature is controlled to be constant, is monitored using a liquid level gauge, and when the amount of paint remaining in the main tank falls below a certain level, Paint is supplied into the main tank from a sub-tank such as a drum can using a replenishment pump. For this reason,
In the main tank, when the liquid level drops, paint scum adheres to the inner surface of the upper part of the main tank, and when the main tank is replenished with paint by the operation of the replenishment pump, the paint scum gets mixed into the paint. It ends up. Therefore, paint spray nozzles in paint consuming equipment, such as vehicle painting equipment, can become blocked by the paint scum. Also, the temperature of the paint in the sub-tank is not controlled, so when the main tank is replenished with paint from the sub-tank, the temperature of the paint in the main tank may temporarily drop or rise, causing the viscosity of the paint to temporarily change. In order to achieve stability, the thickness of the coating on the object to be coated, such as a vehicle body, becomes non-uniform.

The present invention was developed in order to eliminate such conventional drawbacks, and by constantly circulating paint between the main tank and sub-tank, it prevents the generation of paint scum and prevents blockage of paint spray nozzles. It is an object of the present invention to provide a paint supply device that prevents the above problems and maintains a uniform paint temperature and a constant paint film thickness.

In order to achieve this purpose, according to the present invention, the main tank is provided with a paint receiving part that receives paint overflowing from a certain height of the main tank, and the sub tank has a discharge capacity higher than that of the paint supply pump. A large replenishment pump is connected,
The replenishment pump and the main tank are connected through a replenishment pipe, and the paint receiver and the sub-tank are connected through a return pipe.

An embodiment of the present invention will be described below with reference to the drawings. In this paint supply device 1, paint is constantly circulated between a main tank 2 and a sub-tank 3, and paint is supplied to a paint consumption device 4, such as a vehicle body painting device, as needed. Paint is supplied from the main tank 2.

The main tank 2 is constructed by closing the upper part of a bottomed cylindrical tank body 6 with an open upper part with a lid 7, and a jacket 8 as a temperature control means is provided on the outer side of the tank body 7. Jacket 8
A supply pipe 9 and a discharge pipe 1 are installed at the bottom and top of the
0 is connected, and by circulating a temperature control fluid such as hot water or cold water through the jacket 8, the temperature of the paint 5 in the main tank 2 is maintained almost constant in order to make the viscosity of the paint 5 uniform. be done.

A drive unit 12 of a stirrer 11 is fixedly supported on the lid 7, and a stirring blade 13 of the stirrer 11 is fixedly supported on the lid 7.
is located below the paint liquid level l in the main tank 2. Further, a driving section 15 of a paint supply pump 14 is fixed and supported on the lid 7, and an operating section 16 of this paint supply pump 14 is disposed at a lower portion within the main tank 2. A paint supply pipe 31 is connected to the paint supply pump 14 , and the paint supply pipe 31 is further connected to the paint consumption device 4 . The agitator 11 is constantly driven, and the paint supply pump 14 is driven in accordance with the operation of the paint consumption device 4.

The sub-tank 4 is formed by closing the upper part of a cylinder body 17 with an open upper part, such as a drum pipe, with a lid 18, and the lid 18 is bent at the center by a hinge or the like so that it can be opened. Moreover, the height of the tank body 17 is set lower than the tank body 6 of the main tank 2.

Similarly to the main tank 2, a drive section 20 of an agitator 19 and a drive section 22 of a replenishment pump 21 are each fixedly supported on the lid 18 of the sub-tank 3. The operating section 24 of the replenishment pump 21 is disposed within the tank body 17. A replenishment pipe 26 having a filter 25 in the middle is connected to the replenishment pump 21.
The supply pipe 26 penetrates the lid 7 of the main tank 2 and is plunged below the paint liquid level l in the tank body 7.

The replenishment pump 21 is set to have a larger discharge capacity than the paint supply pump 14, and is constantly driven together with the agitator 19. Therefore, the main tank 2 is always supplied with paint in excess of the amount supplied to the paint consuming device 4 by the paint supply pump 14, and excess paint is returned to the sub tank 3.

In order to return excess paint to the sub-tank 3, an overflow gutter 27 is provided on the outer surface of the upper part of the tank body 6 of the main tank 2 at a certain height, e.g., from the upper end, as a paint receiving part to receive the paint overflowing from the upper end of the tank body 6. It will be established over the following years. This overflow gutter 27 protrudes above the upper edge of the tank body 6, and the lid 7 is supported by the overflow gutter 27. Surplus paint obtained by subtracting the amount of paint supplied to the paint consuming device 4 by the paint supply pump 14 from the amount of paint supplied by the replenishment pump 21 overflows from the upper edge of the tank body 6 and flows into the overflow gutter 27. Therefore, in order to return the excess paint that has flowed into the overflow gutter 27 to the sub tank 3, the overflow gutter 27 is
A return pipe 29 is connected to a connecting pipe 28 provided at the bottom of the pipe. On the other hand, on the lid 18 of the sub tank 3,
A connecting pipe 30 that protrudes into the tank body 17 of the sub-tank 3 is connected, and the return pipe 29 is connected to this connecting pipe 30.

Next, to explain the operation of this embodiment, the paint 5 whose concentration is adjusted with a solvent such as thinner
is constantly supplied to the main tank 2 from the sub-tank 3 by the replenishment pump 21, and surplus paint after subtracting the amount sent out by the paint supply pump 14 from the main tank 2 flows from the upper edge of the tank body 6 to the overflow gutter. 27, and further flows through the return pipe 29 due to its own weight to the sub tank 3.
be returned to. Therefore, paint 5 is subtank 3
This means that it is constantly circulating between the main tank 2 and the main tank 2.

In such a paint supply device 1, the tank body 6 of the main tank 2 is always filled with paint 5 up to its upper edge. Therefore, the inner surface of the tank body 6 is not exposed and paint scum is not generated, and as a result, the paint scum is not supplied to the paint consuming device 4, and the paint scum from the paint spray nozzle in the paint consuming device 4 is not generated. No blockage will occur.

In addition, since paint is not temporarily supplied into the main tank 2, the temperature of the paint in the main tank 2 is maintained almost constant, the viscosity of the paint 5 is kept uniform, and the vehicle body The coating thickness of the object to be coated is maintained uniformly, and the coating quality can be improved.

When the amount of paint remaining in the sub-tank 3 falls below a certain value, the operation of the agitator 19 and replenishment pump 21 is temporarily stopped, the concentration-adjusted paint is stored, and the other tank body prepared in advance is transferred to the What is necessary is just to arrange|position it instead of the tank main body 17, and to restart the operation|movement of the agitator 19 and the replenishment pump 21. By doing so, generation of paint scum within the sub-tank 3 is prevented.

When the remaining amount of paint in the sub-tank 3 falls below a certain value, instead of replacing the tank body 17 as described above, the lid 18 is opened and paint is replenished into the tank body 17 of the sub-tank 3. Good too. In this case, there is a risk that paint scum will be generated in the sub tank 3, but the paint scum will be removed from the filter 2.
5, so it will not flow into the main tank. Also, the tank body 17 of sub tank 3
A jacket may be provided in the sub-tank 3 in the same manner as in the main tank 2, and the temperature of the paint in the sub-tank 3 may be controlled to be approximately constant using cold water or hot water.

As described above, according to the present invention, the main tank is provided with a paint receiving portion that receives paint overflowing from the main tank, and the sub-tank is connected to a replenishment pump having a larger discharge capacity than the paint supply pump, The replenishment pump and the main tank are connected via a replenishment pipe, and the paint receiver and the sub-tank are connected via a return pipe, so that the paint constantly circulates between the main tank and the sub-tank, and the main The paint level in the tank is kept constant. Therefore, paint scum is prevented from being generated on the inner surface of the main tank and mixed into the paint, and clogging of the paint spray nozzle in the paint consuming device due to paint scum is prevented. In addition, by circulating the paint, the temperature of the paint in the main tank is kept almost constant, making the viscosity of the paint almost uniform, thereby making it possible to make the thickness of the paint film uniform and improve the quality of the paint.

[Brief explanation of the drawing]

The drawing is a simplified cross-sectional view showing the structure and system of an embodiment of the present invention. 1...Paint supply device, 2...Main tank, 3
... Sub-tank, 4 ... Paint consumption device, 5 ... Paint, 8 ... Jacket as temperature control means, 1
4...Paint supply pump, 21...Replenishment pump, 2
6... Supply pipe, 27... Overflow gutter as a paint receiving section, 29... Return pipe.

Claims (1)

[Scope of utility model registration request] It includes a main tank 2 provided with a temperature control means 8, a paint supply pump 14 for supplying the paint in the main tank 2 to the paint consumption device 4, and a sub tank 3 for replenishing the paint 5 to the main tank 2. In the paint supply device, the main tank 2
is provided with a paint receiving portion 27 for receiving paint overflowing from a certain height of the main tank 2, and the sub tank 3 is provided with a paint receiving portion 27 that receives the paint overflowing from a certain height of the main tank 2.
A replenishment pump 21 having a larger discharge capacity is connected to the main tank 2, and the replenishment pump 21 and the main tank 2 are connected via a replenishment pipe 26.
and the sub-tank 3 are connected via a return pipe 29.