JP3184752U - Gravity air spray gun with stirring device - Google Patents

Abstract

Gravity with a stirrer that enables compressed air supplied to a spray gun and an air motor to operate with a common low compressed air by introducing an air motor that is small and light and can be driven by low compressed air Provide air spray gun.
A wind turbine is provided at an upper portion, and a rotor R having a paint stirring screw at a lower portion is pivotally supported and a cylindrical chamber AR in which the wind turbine is rotated is provided, and a compressed air intake port is provided in the cylindrical chamber. An AI and an air exhaust port are provided, a bypass air passage is formed in a wall of the cylindrical chamber in a predetermined section connecting the two, and an opening through which the bypass air passage and the cylindrical chamber communicate with each other is provided. Configured.
[Selection] Figure 3

Description

      The present invention relates to a gravity-type air spray gun with a stirring device, and is particularly suitable for use in paints containing highly settled metallic, pearls, etc. in the field such as an automobile repair coating factory.

    The so-called on-site painting work performed at automobile repair shops, etc. requires not only spraying work from the top, side and bottom surfaces of the object to be painted, but also the object to be repaired. In addition to the subtle color matching of paint that comes from the years of use, sunburn, etc., there are also many kinds of work elements that are in-kind due to the fact that there are many kinds and small amount of repair area, etc. The performance and productivity are greatly affected.

    As a general painting system for such a field, a compressor with a tank that stably generates, stores, and supplies compressed air of about 10 to 15 kg / cm 2, a pressure regulator connected to the tank, and a flexible hose And the like, and a compressed air supply device that supplies compressed air of about 5 kg / cm <2>, and a gravity air with a stirring device that is connected to the compressed air supply device and sprays paint on the object to be coated using the compressed air There is a spray gun.

This consists of an air spray gun main body and a gravity type paint supply device that supplies the paint to the paint inflow passage provided at the head of the air spray gun main body using gravity.
This gravity-type paint supply device includes a paint cup for supplying paint using gravity to the paint inflow passage of the air spray gun, an upper lid for closing the upper opening of the paint cup, and an air provided outside the upper lid. This air motor comprises a cylindrical motor chamber connected to a compressed air supply path branched from an air spray gun and is rotatably supported by the motor chamber so as to receive the compressed air. And a stirring screw that stirs the paint in the paint cup with the rotating shaft of the rotor extending into the paint cup.

    The compressed air supplied to the air spray gun and the air motor is about 4 to 5 kg via a pressure regulator after branching each other's air path so as not to be subjected to pressure fluctuations depending on the operating state of both. / Cm 2 of compressed air is supplied (see, for example, Patent Document 1).

On the other hand, in order to improve the working environment and the adhesion rate of the paint to the object, the improvement of the paint and the improvement of the spray gun have progressed, including metallic, pearl, etc. with low compressed air of about 1.5kg / cm2. Although spraying of paint has become possible, the operation of an air motor (paint agitation), which is required to be compact and lightweight, still requires several kg / cm2 of compressed air, and compression that works optimally for both. Due to the difference in air pressure, there is a drawback that both pressure setting operations are complicated.
For highly skilled workers, this compressed air of several kg / cm2 is one of the attractive options from the viewpoint of improving work efficiency, but high-pressure compressed air is required to increase work efficiency. However, there are disadvantages in that the adhesion efficiency to the object to be coated is low, which is disadvantageous in terms of economy, and the working environment is deteriorated due to the increase of floating dust in the paint.

Japanese Utility Model Publication No. 3-61948 (Japanese Utility Model Publication No. 7-25239)

    In view of the above-mentioned conventional drawbacks, the present invention provides an air motor that can be driven at a low pressure with a small size and light weight, so that the (gravity) air spray gun and the air motor are supplied with compressed air. It is a common low pressure, free from the complexity of pressure setting work, regardless of the skill level of the operator, ensuring work stability, allowing for highly economical painting, The object is to provide a gravity air spray gun with a stirrer that can be painted in a work environment with low airborne dust.

In order to achieve the above object, the first device is a spray gun body S1 connected to a compressed air supply path, a paint nozzle S2 attached to the tip of the spray gun body S1, and a paint nozzle S2 attached so as to surround it. Spray gun S consisting of the air cap S3
A paint supply path TK connected to the paint suction path of the head 6 of the spray gun body S1,
A paint cup 20 provided with a connection portion rotatably connected to the paint supply path TK at the lower end outlet, a cup upper lid 21 for closing the upper opening of the paint cup 20, and the compression provided on the outside of the cup upper lid It consists of an air motor M connected to the air supply path,
The air motor is provided with a windmill 28 in the upper part and a cylindrical chamber AR that supports the rotor R having a paint stirring screw 33 in the lower part and rotates the windmill, and the compressed air supply path is provided in the cylindrical chamber. An air intake port AI for taking in compressed air from the air and an air exhaust port AO for discharging the compressed air taken in, from the air intake port connecting the air intake port and the air exhaust port A bypass air passage is formed in the cylindrical chamber wall of the section, and a gravity-type air spray gun with a stirrer is provided with an opening through which the bypass air passage and the cylindrical chamber AR communicate in whole or in part. .

    In the second device, the bypass air passage is formed as a plurality of separated bypass air passages to constitute a gravity air spray gun with a stirring device.

    In the third device, an air intake port provided on the side wall of the cylindrical chamber is formed so as to be positioned below the air exhaust port, thereby constituting a gravity air spray gun with a stirring device.

As apparent from the above description, the present invention has the following effects.
In the first device, a bypass air passage is formed in the inner wall of a predetermined section from the air intake port in the cylindrical chamber in which the windmill rotates, and the bypass air passage and the cylindrical chamber are completely or partially connected. Since there are a plurality of openings that communicate with each other, compressed air taken in from the air intake port is dispersed through the bypass air passage and is simultaneously blown to the blades of the windmill, so that a single windmill Compared to the case of the conventional example in which compressed air is sprayed, the windmill can receive a compressed air of the same pressure as the compressed air used in the spray gun and can rotate stably at a predetermined low speed and high torque. A well-stirred and uniform paint without foaming is supplied to the spray gun. Therefore, the compressed air supplied to the spray gun and the air motor can be the same low compressed air, so that fine adjustment of the spray gun and the air motor is simplified.

  In the second device, in addition to the first device, since the bypass air passage is a plurality of separate and independent bypass air passages, the amount of compressed air blown out from each independent air passage is reduced. As a result, it is possible to provide a stable rotor that operates at a desired rotational speed and rotational torque.

  In the third device, in addition to the first and second devices, the air intake port provided on the side wall of the cylindrical chamber is further provided below the air exhaust port. Therefore, the compressed air blown out from the bypass air passage acts to rotate the wind turbine while pushing the wind turbine upward, so that it acts to reduce the apparent weight of the rotor. Efficiency is improved.

BRIEF DESCRIPTION OF THE DRAWINGS The gravity-type air spray gun coating system whole block diagram of Example 1 of this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a main part of an air motor according to a first embodiment of the present invention. AA sectional view of FIG. The principal part sectional drawing which shows the principal part of Example 2 of this invention. Sectional drawing which shows the principal part of Example 3 of this invention.

      Hereinafter, the present invention will be described in detail based on the embodiment shown in FIGS.

Example 1
A first embodiment of the present invention shown in FIGS. 1 to 4 will be described with reference to the drawings. The coating system of the first embodiment reduces the high pressure to a low compressed air of about 1.5 kg / cm 2 and a movable compressor 1 having a tank 2 that generates and stores high pressure compressed air of 10 to 15 kg / cm 2. In addition, compressed air transportation in which pressure regulator 3 having a function of removing moisture and branching member 4 which receives this low compressed air of about 1.5 kg / cm2 and branches into two paths are connected by pressure-resistant flexible pipes P1 and P2. And a gravity air spray gun with a stirrer connected to the end of the transportation path.

    The gravity type air spray gun with a stirrer is connected to one path of the branching member 4 through a flow rate regulator 5 and a pressure-resistant flexible pipe P3, and to the other path of the branching member 4. It consists of spray gun S. The spray gun S is a well-known one, and a detailed description thereof will be omitted. The outline of the configuration will be described below.

The spray gun S includes a spray gun body S1, a paint nozzle S2 attached to the tip thereof, and an air cap S3 attached so as to surround the paint nozzle S2.
The spray gun body S1 has a head 6 at the tip, a trigger 7 at the center, and a grip 8 below the rear.
The head 6 is provided with a paint nozzle S2, an air cap S3, and a gravity paint supply device T.
At the rear grip 8 and the vicinity thereof, a gun air intake port 9 for taking in low-pressure compressed air of about 1.5 kg / cm 2, a gun air flow rate regulator 10 for adjusting the intake amount, and a discharge for adjusting the discharge amount of the paint A paint adjuster 11 and a pattern adjuster 12 for adjusting the spray pattern are provided.
The branching member 4 may be provided in the lower part of the grip portion 8 in the air spray gun S1 and between the air intake port 9 and the flow rate regulator 10.

    The gravity-type paint supply device T is located in the lower part of the paint cup 20, the cup upper lid 21, the air motor M, and the paint cup 20 and is provided with a paint suction path (shown in the head 6 of the spray gun body S1). The paint cup 20 can be attached at any angle, and a plurality of members that are detachably fixed (shown schematically in a partial cross-sectional view in FIG. And a paint supply path TK (see FIG. 2).

The air motor M, which is the main part of the present invention, will be described in detail (see FIGS. 2 to 4).
The air motor M is composed of a cylindrical motor chamber body 22, a motor chamber upper cover 24 having a sleeve-like bearing 27 at the inner center, and a rotor R rotatably supported between the two. It is configured.

The motor chamber main body 22 is formed with a cylindrical chamber AR having an air intake port AI for introducing compressed air and an air exhaust port AO for discharging on the side wall 23, and is provided in the side wall 23 of the cylindrical chamber AR. A belt-like concave groove 30 (which is a characteristic part of the present invention) serving as a bypass air passage is formed in a predetermined section around the air intake port AI and the air exhaust port AO.
In addition, a shaft fixing portion 32 that protrudes downward is formed in the lower portion of the cylindrical chamber AR, and extends through the hole provided in the center portion of the cup upper lid 21 into the lower paint cup 20. . The shaft fixing portion 32 has a bearing 29 on the inner periphery and a male screw portion (not shown) on the outer periphery, and the motor chamber body 22 has cushions 31 and 31 on a cup upper lid 21 and a seal ring 34 made of a felt material. It is fixed with a cap nut 35.

    The rotor R includes a motor shaft 25 in which a flange 26 is formed in an intermediate portion, a windmill 28 that is press-fitted from the upper end side of the motor shaft 25 and positioned in contact with the flange 26, and a paint that is press-fitted to the lower end side. The stirring screw 33 (which is press-fitted after the motor chamber main body 22 is attached to the cup upper lid 21 with the cap nut 35).

The windmill 28 is provided with a predetermined number of semi-arc-shaped blades 18 radially, and both end surfaces of the blade 18 are closed by the side plates 19 so that the compressed air blown from the side plates 19 and 19 does not escape. It is. The blades 18 may be flat.
The motor shaft 25 into which the windmill 28 has been press-fitted is positioned while the lower surface of the flange 26 abuts against the bearing 29 and is pivotally supported. The head is pivotally supported by the bearing 27 and the rotor R is set in the cylindrical chamber AR. .
The paint agitating screw 33 press-fitted into the lower part of the motor shaft 25 is of a type that agitates in the lower circumferential direction while pushing down the paint downward during rotation. It is shaped so as to increase the rotational performance of the motor by acting upward so as to make it lighter. If sufficient rotation is obtained, the paint stirring screw 33 may be used in the reverse direction.

    In the air motor M configured as described above, a part of the compressed air flowing into the cylindrical chamber AR from the air inlet AI hits the blade 18 of the nearest wind turbine and becomes the main force for rotating the wind turbine 28, and the remaining compressed air is the bypass wind. It flows through the concave groove 30 that is a path and is blown to the blades ahead (which has already passed) to give rotational energy, and the remaining compressed air is blown to the blades that are moving ahead and multistage. Thus, the air is exhausted from the air exhaust port AO while hitting a plurality of blades 18 and sequentially releasing the energy.

Therefore, the amount of compressed air energy that impinges on the blades closest to the air intake AI is reduced by the amount that flows by bypassing the concave groove 30, but the compressed air that has flowed with the concave groove 30 as a bypass air passage is located ahead. Since the compressed air that has flowed by bypassing the vane becomes energy that rotates the preceding vane, the windmill 28 is compared with the case where there is no concave groove 30 serving as a bypass air passage, Although it is low speed, it rotates with high torque.
This makes it possible to stably maintain the required rotation speed within the specified range while being influenced by the amount of paint in the paint cup and the viscosity of the paint, and to stably stir without unnecessary foaming at high speed. Is made.

Other Embodiments Another embodiment of the air motor will be described with reference to FIGS. In the description of these embodiments, the same components as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

In the second embodiment shown in FIG. 5, the main difference from the first embodiment is that a tunnel 30T is provided in the side wall instead of the concave groove 30 serving as a bypass air passage, and a blowout hole communicating with the cylindrical chamber AR is provided in the tunnel 30T. It has a structure in which 30TO is provided at a predetermined position.
Even if comprised in this way, the effect | action and effect equivalent to Example 1 are acquired. In consideration of productivity, as an alternative to the tunnel structure, a lid that covers the concave groove 30 may be formed as a separate part, and a structure may be provided in which a blowing hole is provided in the lid (not shown).

In the third embodiment shown in FIG. 6, the main difference from the second embodiment is that the tunnel 30T of the second embodiment is divided into a plurality of tunnels by partition walls 30K provided in the vertical direction, and the tunnels 30T are respectively provided at the end portions of the respective tunnels. The structure is such that a blowout hole 30TO communicating with the cylindrical chamber AR is provided at a predetermined position.
By doing in this way, the freedom degree of design as a bypass wind path increases, and the effect | action and effect of Example 2 can be acquired more stably.
Note that the partition wall 30K may be a bypass air passage formed in the thickness direction of the side wall 23, and a structure in which a blowout hole is provided at the tip of each air passage (not shown).

In the fourth embodiment (not shown), the main difference from the first to third embodiments is that the air intake port AI is provided in the lower portion of the side wall 23 of the motor chamber body 22 and the air discharge port AO is provided in the upper portion of the side wall 23. The bypass air passage (the concave groove 30 of the first embodiment, the tunnel 30T of the second and third embodiments) that connects between the predetermined intervals is formed in a spiral shape, and is applied to the first to third embodiments.
By doing in this way, in addition to the effects and effects of the first to third embodiments, the compressed air acts to push the windmill 28 upward, so the apparent weight of the rotor R becomes lighter. The rotational property of the rotor R is improved.

    In the fifth embodiment (not shown), the main differences from the first to fourth embodiments are the effects and effects obtained in the fourth embodiment (the compressed air acts to push the windmill 28 upward, and the rotor R In order to obtain more stable stability, the apparent weight is reduced and the rotational performance of the rotor R is improved. The blade 18 is inclined at an acute angle with respect to the direction of the compressed air to be blown. It is a point that has been configured.

    The present invention is used in industries that manufacture, sell, and use a gravity air spray gun with a stirring device.

S spray gun
S1 spray gun body
S2 Paint nozzle
S3 air cap
TK Paint supply path M Air motor
AR cylindrical chamber
AI air intake
AO Air exhaust port
R rotor 20 paint cup
21 cup top lid
28 Windmill 33 Paint stirring screw

Claims (3)

A spray gun comprising a spray gun body connected to a compressed air supply path, a paint nozzle attached to the tip of the spray gun body, and an air cap attached to surround the paint nozzle;
A paint supply path connected to the paint suction path of the head of the spray gun body;
A paint cup provided with a connection portion rotatably connected to the paint supply path at the outlet of the lower end, an upper lid that closes the upper opening of the paint cup, and an outer cover that is connected to the compressed air supply path. Air motor,
The air motor includes a wind turbine at an upper portion and a cylindrical chamber in which the wind turbine rotates while pivotally supporting a rotor having a paint stirring screw at a lower portion. The compressed air from the compressed air supply path is provided in the cylindrical chamber. Equipped with an air intake port for taking in and an air exhaust port for discharging the taken compressed air,
A bypass air passage is formed in the cylindrical chamber wall in a predetermined section from the air intake port connecting the air intake port and the air exhaust port, and the bypass air passage and the cylindrical chamber are entirely or partially Gravity air spray gun with a stirring device, characterized by having an opening that communicates with each other. The gravity-type air spray gun with a stirring device according to claim 1, wherein the bypass air passage is composed of a plurality of separated bypass air passages. The air intake port provided in the side wall of the cylindrical chamber is provided so as to be located below the air exhaust port. Gravity air spray gun with stirring device.

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