JPH07100412A - Coating material spraying device - Google Patents

Abstract

(57) [Summary] [Structure] When the needle valve 33 is screwed forward as shown by the solid line to bring the front valve body portion 37 closer to the first valve seat 31,
The flow rate to the output port 25 side is throttled. The second with it
Since the valve seat 32 is opened, the pressurized air whose outflow to the air nozzle 4 side is restricted is discharged from the discharge port 42 to the outside. Therefore, the supply flow rate of the pressurized air itself is prevented from decreasing, the sensor and the like do not operate, and the motor is driven, that is, the supply of the coating material is continued. As a result, the spraying work is performed with a small amount of pressurized air. To return to the normal spraying operation, the needle valve 33 may be retracted in the direction shown by the chain line. [Effect] The special spraying work with a small amount of the pressurized air can be carried out subsequently to the normal spraying work simply and reliably by operating the air adjusting valve while being at the spraying site.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spraying apparatus for high-granular construction coating materials such as lysine and tiles, and is particularly convenient when performing a special spraying work with a small amount of pressurized air jetted. The present invention relates to a coating material spraying device having a function.

[0002]

2. Description of the Related Art An example of a coating material spraying device of this type will be described with reference to FIG. 1 showing an embodiment of the present invention. Reference numeral 1 is a gun having a coating material passage 2 formed therein, and a coating material nozzle 3 for spraying coating material is formed in an oblique posture at the tip of the gun. The air nozzle 4 is attached so as to penetrate the back side.

One end of a long coating material hose 5 is connected to the rear end of the gun 1, and the other end of the coating material pump 8 is driven by a motor 6 to pump the coating material a in the tank 7 at a low pressure. It is connected to the outlet. At the rear end of the gun 1, a cock 1
A ball valve 10 that opens and closes the coating material flow path by rotating 1 is provided.

The rear end of the air nozzle 4 is connected to the ball valve 10 via a connecting hose 13 which is arranged along the outside of the gun 1.
Connected to the output port of an air opening / closing valve 14 which is provided near the ball valve 10 and whose opening / closing is controlled simultaneously with the ball valve 10.
The input port of the air opening / closing valve 14 is connected to the compressor 16 via a long air hose 15.

At the position of the compressor 16 side of the air hose 15, a differential pressure type flow switch 18 for detecting when the flow rate of the pressurized air flowing therethrough becomes below a certain level is provided. A controller 19 that stops the motor 6 when it receives a detection signal from the flow switch 18 is connected to the motor 6 for driving the coating material pump 8.

That is, to perform the spraying work, the motor 6
The ball valve 1 by operating the cock 11
0 and the air opening / closing valve 14 are opened, the coating material a is supplied to the coating material nozzle 3 at a low pressure, and the pressurized air is jetted from the air nozzle 4, so that the coating material a is ejected in a granular form. It is sprayed on the walls such as walls. At that time, the ejection amount of the pressurized air from the air nozzle 4 is adjusted by an appropriate flow control valve provided in the air flow path.

When the supply flow rate of the pressurized air becomes less than a certain level, the flow switch 18 is activated and the controller 19 controls the motor 6 to stop so that the supply of the coating material a is automatically stopped. It has become.

[0008]

However, depending on the spraying conditions at the site, the type of coating material, etc., it is sometimes desired to spray the pressurized air with a small amount.

When performing such a special spraying work,
In order to secure the supply of the coating material a, it is necessary to turn off the controller 19 that controls the motor 6 to stop. However, the spraying site is far from the installation position of the controller 19 because of the nature of the work. Therefore, in order to perform the above special spraying work during the normal spraying work, it is necessary to return to the installation location of the controller 19 far from the spraying site and operate it. Also, when returning to the normal spraying work again, it is necessary to visit each remote location as well, which is a very troublesome drawback.

[0010]

As means for solving the above-mentioned problems, the coating material spraying device of the present invention restricts the flow rate of the pressurized air supplied to the air nozzle to the position of the air hose on the gun side. A manually operable air adjustment valve capable of discharging excess pressurized air generated by the throttling to the outside is provided.

[0011]

The flow rate of the pressurized air ejected from the air nozzle is adjusted by changing the degree of throttling of the air adjusting valve. At that time, the pressurized air that cannot flow out to the air nozzle side due to the throttling operation is It is discharged to the outside.

That is, if the amount of the pressurized air ejected from the air nozzle is greatly reduced in order to make it small, the flow rate flowing through the sensor would be greatly reduced and the motor would stop in the conventional case. Further, since the pressurized air is exhausted from the air adjusting valve by a corresponding amount, it is possible to prevent the flow rate flowing through the sensor portion from being greatly reduced.

Therefore, the motor and the control mechanism are not operated and the motor continues to be driven, and subsequently the coating material is supplied. As a result, the spraying operation is performed with a small amount of pressurized air ejected.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In this embodiment, as shown in FIG. 1, an air adjusting valve 21 is connected to the rear end of the air nozzle 4, and the air adjusting valve 21 is connected via an elbow 22 to the above-mentioned connection hose 13 for feeding pressurized air. It is connected to the.

Next, the air regulating valve 21 will be described in detail with reference to FIG. An input port 24 to which one end of the elbow 22 described above is screwed is provided on both side surfaces of the body 23.
And an output port 25 to which the rear end of the air nozzle 4 is screwed are opened. A device hole 26 is formed on the other surface of the body 23 in a direction perpendicular to the ports 24 and 25, and the outer surface of the device hole 26 on the rear end side is the input port 2.
4, the back surface is communicated with the output port 25, respectively.

The tip of the device hole 26 is located in the device hole 26.
An intermediate cylinder 28 reaching a position before the communication port with the input port 24 of 6 is airtightly fitted, and a valve chamber 29 is formed between the intermediate cylinder 28 and the inner surface of the device hole 26. On the inner peripheral surface of the intermediate cylinder 28, an internal thread 30 is cut on the open end side, an enlarged diameter portion 31 of a constant width is formed subsequently, and a reduced diameter portion 32 is formed on the tip end side.

A taper-shaped first valve seat 31 is provided at a communication port on the inner surface of the valve chamber 29 with the output port 25, and a taper-shaped second valve seat 31 is provided at the inner circumference of the tip of the intermediate cylinder 28. Valve seat 3
2 are formed respectively.

In the intermediate cylinder 28, a needle valve 33 having a head portion 34 housed in the valve chamber 29 at its tip is formed.
The male screw 35 formed on the rear end side is screwed into the female screw 30 of the intermediate cylinder 28 and fitted, and the knob 36 attached to the rear projecting end is rotated to rotate in the forward and reverse directions to advance the screw forward and backward. It can be done.

At the front end side and the rear end side of the head portion 34 of the needle valve 33, the above-mentioned first valve seat 31 and second valve seat 32 are provided.
A front valve body portion 37 and a rear valve body portion 38 which are alternately contacted with and separated from each other are formed. Further, the shaft portion 39 at the rear of the head portion 34 is fitted with a gap between the shaft portion 39 and the inner circumference of the reduced diameter portion 32 of the intermediate cylinder 28, and the ring-shaped air chamber 4 is formed between the shaft portion 39 and the enlarged diameter portion 31.
It is designed to form 0.

The intermediate cylinder 28 has a through hole 41 cut out at a position corresponding to the ring-shaped air chamber 40.
A discharge port 42 is opened at a position aligned with the through hole 41 of the nozzle 3.

Next, the operation of this embodiment will be described. When the amount of pressurized air jetted from the air nozzle 4 is made to be a very small amount,
Rotate the knob 36 in the forward direction, and as shown by the solid line in FIG.
The needle valve 33 is screwed forward so that the front valve body portion 37 approaches the first valve seat 31.

As a result, from the input port 24 to the valve chamber 29
The flow rate of the pressurized air flowing into the inside is supplied to the air nozzle 4 from the output port 25 after the flow rate is reduced by the first valve seat 31, but the second valve seat 32 becomes large due to the above-mentioned throttle operation. Since it is opened, the pressurized air, which is restricted from flowing to the output port 25 side, passes through the gap between the outer periphery of the needle valve 33 and the inner periphery of the intermediate cylinder 28 from the second valve seat 32 thereof. The air flows into the ring-shaped air chamber 40 and is discharged to the outside from the discharge port 42 through the passage 41.

Therefore, the flow rate of the pressurized air supplied from the compressor 16 is not significantly reduced, the drive of the motor 6 is continued without operating the flow switch 18 and the controller 19, and the coating material a is continuously applied. Supply is made. As a result, the spraying operation is performed with a small amount of pressurized air ejected.

When returning to a normal spraying operation in which the amount of pressurized air ejected from the air nozzle 4 is large, the knob 36 is rotated in the opposite direction to screw the needle valve 33 backward, and the first valve is rotated. The opening of the seat 31 should be large. For example, as shown by the chain line in FIG. 2, when the rear valve body portion 38 is pressed against the second valve seat 32 and closed, the first valve seat 31 is fully opened and the pressurized air flowing into the valve chamber 29 is released. All the air is supplied from the output port 25 to the air nozzle 4 without flowing to the exhaust port 42 side.

[0025]

As described above in detail, according to the present invention, when a special spraying work with a small amount of pressurized air is carried out subsequent to the normal spraying work, the spraying work can be performed while being at the spraying site. There is an effect that it can be easily and surely performed only by operating the air adjusting valve.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of an air regulating valve.

[Explanation of symbols]

a: coating material 1: gun 3: coating material nozzle 4: air nozzle 5: coating material hose 6: motor 8: coating material pump 1
0: Ball valve 11: Cock 14: Air opening / closing valve 15: Air hose 16: Compressor (air supply source)
18: Flow switch (sensor) 19: Controller 2
1: Air adjustment valve 24: Input port 25: Output port 31, 32: Valve seat 33: Needle valve 36: Knob
37, 38: Valve body 42: Discharge port

Claims (1)

[Claims] 1. A gun having a coating material nozzle for jetting coating material at its tip and an air nozzle for jetting pressurized air facing the inside of the coating material nozzle is driven by a motor or the like via a coating material hose. Along with connecting to a coating material pump, the air nozzle is connected to an air supply source via an air hose, and the coating material flow passage and the opening / closing valve of the air flow passage provided in the gun are opened to lower the pressure to the coating material nozzle. By spraying pressurized air from the air nozzle together with supplying the coating material, the coating material is sprayed on the object to be granulated, and the flow rate of the pressurized air is increased by the sensor provided in the air hose. In a coating material spraying device equipped with a control mechanism that stops the motor when it is detected that the temperature is below a certain level, the flow rate of the pressurized air supplied to the air nozzle is set at the position of the gun side of the air hose. Aperture One coating material spray device being characterized in that interposed a manually operable air control valve which excess pressurized air can discharge to the outside occurs with the stop.