JPS588360Y2 - Paint flow control device in paint sprayer - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a paint flow rate control device in a coating machine.

In a painting machine that applies pressure to the paint itself and sprays atomized paint from the paint gun, the viscosity of the paint changes as the atmospheric temperature or the temperature in the painting room changes, causing the paint to be sprayed from the paint gun. This causes variations in the paint flow rate.

In order to reduce the variation in the paint flow rate due to changes in the viscosity of the paint, conventionally a screw-adjustable paint regulator was installed in the paint passage that pumped the paint to the paint gun to control the paint flow rate. A paint regulator operated by an air regulator was provided to control the paint flow rate by manually operating a threaded portion in response to changes in paint viscosity.

However, since the conventional method described above is manually controlled at appropriate time intervals, it is not possible to sufficiently control the paint flow rate due to changes in paint viscosity, resulting in an uneven paint film, and the drawback is that it requires manual operation. There was some inconvenience due to operation.

This invention eliminates the drawbacks of the conventional flow rate control device described above, and even if the viscosity of the paint changes due to changes in room temperature, etc.
To provide a flow rate control device for paint applied to a coating machine that can automatically maintain the viscosity of paint at a constant level.

An embodiment of this invention will be described below with reference to FIG.

A paint regulator 3 is provided in a paint passage 2 that pressure-feeds paint to the paint gun 1.
b and a paint control chamber 3c, the paint control chamber 3c has an opening at the tip of the paint passage 2, and a paint control valve 4 attached to a diaphragm 3a is provided in this opening.
The opening degree of the paint control valve 4 is changed by the vertical movement of the diaphragm 3a due to the pressure change, and the flow rate of paint flowing into the coating gun 1 is controlled.

The air chamber 3b of the paint regulator 3 is connected to an air connecting pipe 6 connected to an air regulator 5, and the air regulator 5 has a diaphragm 5as, an air control chamber 5b, and an air control valve 7, similar to the paint regulator 3. At the same time, an adjusting screw 8 with a spring 8a interposed on the upper part of the diaphragm 5a is provided, and the vertical movement of the adjusting screw 8 causes the air control valve 7 equipped with the iCQ to move under the diaphragm 5a. It is designed to control air pressure.

An air pressure adjustment passage 9 is branched from the air connecting pipe 6 that connects the air regulator 5 and the air chamber 3b of the paint regulator 3, and an atmospheric heat sensor 1 is attached to the tip of the air pressure adjustment passage 9.
0 is set.

In the atmospheric heat sensor 10, a protrusion 11a attached to a bimetallic metal 11iC faces an air nozzle 12 formed at the tip of the air pressure adjustment passage 9, and the protrusion 11a of the bimetal 11 swings left and right in proportion to changes in indoor temperature, etc. By changing the opening degree of the air nozzle/N2, air nozzle 1
When the air pipe 2 opens, a part of the air in the air communication pipe 6 is released and the pressure thereof is controlled to decrease.

In the apparatus Ki having the above structure, when the indoor temperature is low, the air nozzle 12 of the atmospheric heat sensor 10 is closed, and the air pressure is delivered from the air regulator 5 to the air chamber 3b of the paint regulator 3 via the air connecting pipe 6. The diaphragm 3a is pushed down to fully open the paint control valve 4.

Next, when the indoor temperature rises, the air nozzle 12 gradually opens in proportion to the rise in indoor temperature and releases a part of the air.
The air pressure in the air chamber 3b of the paint regulator 3 decreases, and the opening degree of the paint control valve 4 becomes smaller.

Therefore, when the viscosity of the paint increases due to a drop in the indoor temperature, the opening degree of the paint control valve 4 increases, and conversely, when the viscosity decreases, the opening degree of the paint control valve 4 increases. Even if the viscosity of the paint changes as the indoor temperature changes, the paint sprayed from the paint gun 1 is automatically kept constant.

Fig. 2 shows another embodiment in which the air control mechanism includes a main pressure regulator, an auxiliary pressure regulator, etc. interposed in the air regulator, and the overall effect of these regulators controls the flow rate of paint from the paint regulator. It is an attempt to control the

That is, a branch air passage 13a branched from an air passage 13 that pressure-feeds compressed air to the air regulator 5 [a main pressure regulator 14 is provided, and the main pressure regulator 14 is connected to the gouyafu shim 14a1 air leg chamber similarly to the air regulator 5 described above. 14
b1 and an air control valve 15, and a diaphragm 14a.
A rod 16 is attached to the top surface and protrudes upward, and the air control chamber 14b and the air chamber 3b of the paint regulator 3 are connected to each other.
and are connected to each other by a first air connecting pipe 17.

and a second air connecting pipe connected to the other air regulator 5.
An auxiliary pressure regulator 19 is connected to the end of the 8, and the auxiliary pressure regulator 19 has a diaphragm 19a1 and an air chamber 19b.
A rod 20 similar to the rod 16 of No. 4 is attached.

The pins 16a, 20a fixed to the upper ends of both rods 16.20 are located in elongated holes 22a at the end of the lever 22, which are pivotally supported by the shaft pin 21.

22 a VC is fitted, and the lever 22 can swing around the shaft pin 21 by vertical movement of the rod 16° 20 .

An air pressure adjustment path 9 branches from the second air connecting pipe 18, and an atmospheric heat sensor 10 is provided at the end thereof.

In the apparatus shown in FIG. 2, when the indoor temperature is low, the air nozzle 12 of the atmospheric heat sensor 10 is closed, and the air chamber 19bV' of the auxiliary pressure regulator 19 is connected to the air regulator 5.
? - The rod 20 is pushed up by the delivered air pressure, and the lever 22 is tilted in direction P to push down the rod 16 of the main pressure regulator 14 and fully open the air control valve 15.

Next, when the atmospheric temperature rises, part of the air is released from the air nozzle 12, the air pressure in the air chamber 19b decreases, the rod 20 is pulled down, and the lever 22 is tilted in the opposite direction of P. and pull up the rod 16 of the main pressure regulator 14,
Reduce the opening degree of the air control valve 15.

When the opening degree of the air control valve 15 of the main pressure regulator 14 is large, the air pressure in the air chamber 3b of the paint regulator 3 becomes high, increasing the opening degree of the paint control valve 4, and vice versa. 15 becomes smaller, the opening of the paint control valve 4 becomes smaller, and as a result, as in the case of the embodiment shown in FIG. 1, the viscosity of the paint decreases as the indoor temperature changes. Even if the flow rate of the paint sprayed from the paint gun 1 changes, the flow rate of the paint sprayed from the paint gun 1 is automatically kept constant.

In this embodiment, several shaft holes 22b are bored in the lever 22, and by replacing the shaft pin 21 with any shaft hole 22b, the air pressure in the air chamber 19b of the auxiliary pressure regulator 19 and the main pressure can be adjusted. The relationship between the opening degree of the air control valve 15 of the container 14 can be adjusted arbitrarily, so when using paints with different physical properties such as viscosity, by changing the position of the shaft pin 21, changes in the indoor temperature etc. can be adjusted. It is easy to control the paint flow rate corresponding to the

As explained above, this idea involves attaching an atmospheric heat sensor to an air control mechanism equipped with an air regulator that detects changes in room temperature and changes the air pressure from the air control mechanism according to the detected amount. It is equipped with a paint regulator that adjusts the paint flow rate using air pressure from the control mechanism, so even if the viscosity of the paint changes due to changes in room temperature,
Since the paint flow rate can be controlled automatically and proportionally to changes in room temperature, uneven thickness of the paint film does not occur.

Furthermore, since the flow rate of the paint is controlled by air pressure and no electricity is used, it is safe even when large amounts of organic solvents are used in the paint.

Note that the air control mechanism can control multiple paint regulators at the same time.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of an embodiment of this invention, and FIG. 2 is a system diagram of another embodiment. 3: Paint regulator, 5: Air regulator, 6: Air connecting pipe, 9: Air pressure adjustment passage, 10: Atmospheric heat sensor,
11: Bimetal pressure regulator, 12: Air nozzle/L, 14: Main pressure regulator, 17: First air communication pipe, 18: Second air connecting pipe, 19: Auxiliary pressure regulator, 22 Nilever.

Claims (1)

[Scope of Claim for Utility Model Registration] [I] An air heat sensor that detects changes in room temperature and changes the air pressure from the air control mechanism according to the detected amount is attached to an air control mechanism equipped with an air regulator, and A paint flow rate control device for a paint sprayer, characterized by being provided with a paint regulator that adjusts the paint flow rate using air pressure from a control mechanism. [2] A utility model in which the atmospheric heat sensor consists of an air nozzle installed in an air pressure adjustment passage branched from an air connecting pipe connected to an air regulator, and a bimetal that opens and closes the air nozzle to an opening degree according to a rise in room temperature. Scope of registration claims No. 1
A paint flow rate control device for a paint sprayer as described in 2. 0] Painting machine 1 according to claim 1 or 2 of the utility model registration claim in which the air regulator mechanism consists of only an air regulator
/l-Paint flow control device. [4] The paint flow rate in the coating machine according to claim 1 or 2, wherein the air control mechanism comprises an air regulator, and a main pressure regulator and an auxiliary pressure regulator linked by a lever. Control device.