JPS6035186B2 - Painting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid applicator having a liquid air spray mechanism.

Conventionally, high viscosity liquids of approximately 100 poise or higher (hereinafter simply referred to as "liquids") containing solids such as paints, resin solutions, flakes of glassy/silicic materials, and powders have been sprayed using an air spray mechanism. In order to atomize the particles and apply them to the object to be coated, use a liquid applicator with a compressed air injection nozzle attached to the outer periphery of the tip of the spout, or a liquid distribution hole that fits the spout. The liquid material was coated using a liquid applicator equipped with a compressed air injection nozzle in the hollow part of the container.

In the former liquid applicator, compressed air is simply applied from the periphery to the liquid spouted outside the tip of the spout, or in the latter liquid applicator, the liquid is mixed inside the liquid distribution hole. If you only mix the compressed air in advance, it will separate into a compressed air-rich area and a liquid-rich area, and the compressed air and liquid will not be mixed sufficiently uniformly, resulting in insufficient atomization of the liquid and an uneven and smooth coating surface. Even if the power is increased and the compressed air pressure and compressed air amount are increased, little effect on improving atomization can be expected, and on the contrary, the loss of power increases, and furthermore, both liquid applicators However, there were drawbacks such as rapid expansion of compressed air, which caused the liquid to scatter, resulting in large losses.

The present invention was achieved as a result of research aimed at providing a coating machine that improves the above points.

That is, the present invention provides (1) a liquid applicator having an air spray mechanism with a spout provided at the tip of the liquid distribution hole, {1) a hollow portion of the liquid distribution hole that fits the spout at the tip; a compressed air injection nozzle having a mechanism for injecting compressed air, and '2} a compressed air nozzle having a mechanism for injecting compressed air from the inner circumferential wall of the through hole at the front end of the ejection port at the tip; In this coating machine, the compressed air injection nozzle m has a mechanism for injecting compressed air radially to the inner peripheral wall of the liquid distribution hole, and , 3 The compressed air injection nozzle of the above (■) has a mechanism for injecting compressed air from the inner circumferential wall of the jet port at right angles to the center, or 4 the above {2
) is an embodiment in which the compressed air injection nozzle has a mechanism for injecting compressed air spirally from the inner circumferential wall of the ejection port.

Hereinafter, the present invention will be explained with reference to embodiments shown in the drawings.

In the drawing, a spout 4 having a smaller diameter than the liquid flow hole 3 is provided at the front end of the liquid flow hole 3 in the front part 2 of the liquid material applicator 1 having an air spray mechanism, and A compressed air injection nozzle 5a having a through hole 6a in the hollow part of the liquid distribution hole 3 and a compressed air injection nozzle 5b having a through hole 6b at the front end of the jet nozzle 4 are integrally attached and fixed.

Behind the compressed air injection nozzles 5a, 5b are valve bodies 8a, 8b whose opening degree can be adjusted with adjustment screws 9a, 9b.
The valve devices 7a and 7b having the
, 7b is equipped with a valve device 10 consisting of a valve shaft 11 engaged with a lever 15, a valve body 12, and a coil spring 13, and the valve device 10' is connected to a compressed air inflow hole 16.

Further, a cock 14 which is opened and closed by turning a lever 15 by 1/4 of a turn is attached to the rear of the liquid flow hole 3, and the cock 14 is connected to the liquid flow hole 17. The plurality of through holes 6a formed in the compressed air injection nozzle 5a are usually formed to have a mechanism for injecting compressed air radially to the inner circumferential wall of the liquid distribution hole.
A mechanism that simply injects compressed air toward the front of the jet nozzle.
Alternatively, it may be formed to have a mechanism that combines both.

Further, regarding the plurality of through holes 6b formed in the compressed air injection nozzle 5b, the compressed air is injected from the inner circumferential wall of the nozzle at right angles to the center, or from the inner circumferential wall of the nozzle in a spiral manner. It is formed to have a mechanism for injecting compressed air.

Next, the operation of the coating machine of the present invention will be explained.

The liquid that is quantitatively sent to the liquid applicator 1 by a pump or pressurized tank operated by an air motor, hydraulic cylinder, electric power, etc. is transferred to the liquid inlet hole 17.
The compressed air is sent to the cock 14 through the compressed air inlet 16, and the compressed air is sent to the valve device 10 through the compressed air inlet 16.

Then, when the lever 15 is rotated 1/4, the cock 14 engaged with the lever 15 opens □, and as a result of the opening □, the liquid that has been sent to the cock 14 flows into the liquid distribution hole 3. At the same time, the valve body 12 is pushed backward by the valve shaft 11 engaged with the lever 15 against the elasticity of the coil spring 13, and the valve device 10 is opened. The compressed air is controlled by valve devices 7a and 7b that can adjust the degree of entry by adjusting screws 9a and 9b having valve bodies 8a and 8b, respectively, to appropriately adjust the amount and pressure of the compressed air. It flows into the injection nozzles 5a and 5b and is injected.

The liquid that has flowed into the liquid distribution hole 3 is
Through hole 6 of compressed air injection nozzle 5a attached to the hollow part of
Injection of the flow of liquid from the center to the periphery by a,
By injecting the flow of liquid from the periphery to the center through the through hole 6b of the compressed air injection nozzle 6b attached to the front end of the jet nozzle 4, pseudo-frame mixing with the compressed air is done sufficiently uniformly, and the compressed air is compressed at the jet nozzle 4. Atomization is promoted by uniformly applying the breaking force of air. In addition, since the compressed air injected from the through hole 6b of the compressed air injection nozzle 5b expands rapidly in the direction of ejection and flight of the liquid material (direction of the center line of the ejection port), the atomized liquid material after ejection is scattering is prevented.

When the above operation is completed and the spouting of the liquid material is stopped,
When the lever 15 is turned 1/4 turn and returned to its original position, the lever 15
The cock 14 that is engaged with is closed, and the flow of liquid into the liquid distribution hole 3 is blocked. At the same time, the lever 15
The valve shaft 11 that is engaged with the coil spring 13 returns to its original state, and the valve body 12 is also pushed forward by the elasticity of the coil spring 13, so that the valve device 1 is completely closed, and compressed air flows into the compressed air injection nozzles 5a and 5b. is prevented. The liquid applicator 1 operates to open and close the cock 14 and the valve pupil 10 at the same time or in a staggered manner by turning the lever 15 1'4 times, and ejects the liquid and compressed air at the same time, or ejects the compressed air simultaneously. The ejection mechanism ejects and applies the liquid at appropriate time intervals. Bore shape and material of jet □4, compressed air nozzle 5a,
5b, the diameter, shape, position, and number of the through holes 6a and 6b formed in the compressed air nozzles 5a and 5b, and the jetting conditions such as compressed air pressure, compressed air amount, and liquid discharge amount. The material may be selected by taking into account the type, properties and condition of the product, as well as the appearance and performance required for the paint film, and there are no particular limitations.

Since the present invention is configured as described above, the liquid material and compressed air can be mixed sufficiently uniformly by simply ejecting and applying the liquid material and compressed air at the same time or in a staggered manner.
Good atomization, condition, and coating condition can be formed, and this is particularly noticeable when coating a liquid material with a high viscosity of 100 poise or more.

The handling of the coating machine and the equipment are the same as in the conventional case, and there are no particularly complicated operations required, and there are advantages such as the scattering of liquid materials and the resulting losses are extremely small.

[Brief Description of the Drawings] The drawings show an embodiment of the coating machine according to the present invention.
FIG. 1 is a longitudinal sectional view of the liquid applicator, FIGS. 2 and 3 are sectional views taken along the line A-A' in FIG. 1, and FIGS. 4 and 5 are sectional views taken along the line B-- It is a sectional view along the B line. DESCRIPTION OF SYMBOLS 1...Liquid applicator, 2...Front part of liquid applicator, 3...Liquid substance distribution hole, 4...Spout port, 5a, 5b
...Compressed air injection nozzle, 6a, 6b...through hole,
7a, 7b, 10... Valve device, 8a, 8b, 1
2... Valve body, 9a, 9b... Adjustment screw, 11
... Valve shaft, 13 ... Coil spring, 14 ... Cock, 15 ... Lever, 16 ... Compressed air inflow hole, 17 ... Liquid material inflow hole . Rare figure 2 figure 3 figure 4 younger brother S figure

Claims (1)

[Scope of Claims] 1. In a liquid applicator having an air spray mechanism having a spout at the tip of the liquid distribution hole, (1) a liquid distribution hole communicating with the spout at the tip; A compressed air injection nozzle having a mechanism for injecting compressed air into the hollow part;
2) A coating machine in which a compressed air injection nozzle having a mechanism for injecting compressed air inward from the inner circumferential wall of the jet nozzle is integrally attached to the front end of the jet nozzle at the tip. 2. The coating machine according to claim 1, wherein the compressed air injection nozzle according to claim 1 (1) has a mechanism for injecting compressed air radially to the inner circumferential wall of the liquid distribution hole. 3. The coating machine according to claim 1, wherein the compressed air injection nozzle according to claim 1 (2) has a mechanism for injecting compressed air from the inner circumferential wall of the jet port at right angles to the center. . 4. The coating machine according to claim 1, wherein the compressed air injection nozzle according to claim 1 (2) has a mechanism for injecting compressed air spirally from the inner circumferential wall of the jet nozzle.