JP3020313U - Cartridge-type paint supply line for air atomization type electrostatic painting gun - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention is a cartridge type container in which a paint conduit arranged in an air atomization type electrostatic coating gun is spirally wound and insulation is ensured and maintained. It is intended to provide a paint supply path stored in. [Structure] Inside the cylinder pair which is the cartridge type container body,
The spirally wound paint conduit is provided with a spiral wall for ensuring the wound state.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an air atomization type electrostatic coating gun (hereinafter simply referred to as a coating gun).

[0002]

[Prior art]

 The coating gun has a paint injection hole, a high-voltage application section for paint charging with a needle-shaped electrode protruding from the paint injection hole, and a paint atomization air injection hole near the paint injection hole. The main body contains a high-voltage static electricity supply part that conducts electricity to the high voltage application part for paint charging, and also supplies a paint to the paint injection hole where the high voltage application part for paint charging is arranged. An air supply path for supplying compressed air to the injection hole is formed. In addition, the base of the paint gun has an earthed switch and paint that opens and closes the electric circuit of the high-voltage static electricity supply cable that connects the high-voltage static electricity supply section inside the painting gun from the power source operated by the trigger. A grounded paint valve that opens and closes the paint circuit of the hose that connects from the supply source to the paint supply passage inside the painting gun, and an air circuit of the air supply hose that connects from the air supply source to the air supply passage inside the painting gun The structure has an air valve that opens and closes.

A paint gun using a metallic paint has a low viscosity and a low electric resistance, so that the electric power flows through the paint gun during operation of the paint gun. If the paint leaks to a location and causes dielectric breakdown, or if the paint gun is brought close to a grounded object other than the object to be painted, the metal pigment in the metallic paint flowing through the paint supply path of the paint gun This causes a chained state, and the high-voltage static electricity applied to the electrodes escapes to the grounded paint tank, which makes it difficult to perform electrostatic coating, which is a so-called bridging phenomenon.

In order to eliminate the inconvenience, it is necessary to increase the flow distance of the metallic paint flowing in the paint supply passage arranged in the coating gun so far and increase the electric resistance of the metallic paint to eliminate the inconvenience. The idea was born. One example is the invention disclosed in Japanese Utility Model Publication No. 45357/1985. Other examples in which a paint supply passage wound in a coil shape is attached to the outside of the coating gun to increase the flow distance of the metallic paint and increase the resistance of the metallic paint to eliminate the inconvenience are described in US Patent No. It is disclosed in Japanese Patent No. 4,139,155.

However, with the former structure, the distance of the paint supply passage cannot be made sufficiently long. In the latter structure, the former drawback can be eliminated, but since the paint supply path is located outside the paint gun, there is a risk of causing a dielectric breakdown phenomenon at an unexpected location and causing an accident.

In order to solve these drawbacks, the idea of accommodating the paint supply passage wound in a coil shape in a coating gun arises, which is disclosed in Japanese Patent Publication No. 58231/1986. There is. The invention disclosed in Japanese Examined Patent Publication No. 58231/1987 is superior to the above two in that the coating supply passage is lengthened and is installed in the coating gun. The invention described in Japanese Patent No. 58213 forms a paint conduit storage chamber surrounding a high voltage static electricity supply unit and an air supply passage, and the high voltage supply unit and the air supply passage are provided in the paint conduit storage chamber. The paint conduit forming a part of the paint supply path wound in a coil shape is wound and the paint conduit is stored in the storage chamber. However, there is a drawback in that the thickness of the portion becomes thin in consideration of the overall balance or the overall balance.

[0007] The coating gun is sprayed by atomized paint that adheres to the surface of the coating gun, and the high voltage static electricity charged in the high voltage supply part inside the coating gun also causes the coating gun to paint. Further, dust adheres to the surface of the gun, resulting in the inconvenience of lowering the insulating property of the surface of the coating gun. Therefore, it was necessary to take measures to prevent this, but until now, it was the fact that we could not find any effective means to meet the countermeasures.

In view of the above-mentioned circumstances, the applicant of the present invention has previously made a paint conduit by a spirally wound insulating hose which is housed in a cartridge type container as a whole paint supply passage to be installed in a paint gun, and The invention described in Japanese Patent Application Laid-Open No. 3-242252, based on the idea that the paint atomizing air supply path and the pattern forming air supply path for the atomized coating material, which are arranged in parallel with the voltage static electricity supply section, are stored away. Created. According to the present invention, it can be realized that the portion of the coating gun body surrounding the high-voltage static electricity supply portion is formed of a thick insulating material. In the invention described in Japanese Patent Publication No. 58231/1986, since the thickness of the coating gun main body is thin, the surface of the coating gun main body is protected from static electricity from the high voltage supply section during operation of the coating gun. We provided a coating gun that eliminated all the inconvenience of being affected.

[0009]

[Problems to be solved by the device]

 The present invention is intended to further enhance the insulating property of a paint supply passage formed of a spirally wound insulating hose housed in a cartridge type container arranged in a coating gun.

[0010]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a coating gun formed on a main body of a coating gun to a base end member of a cylindrical body provided with a spirally wound paint hose, which is a wall for coating a paint pipe. The paint feeding mechanism of the charging mechanism has a communication hole that communicates with the paint feeding through hole, and the lid that is the tip of the cylinder has a communication hole that communicates with the paint channel formed in the coating gun body. The inlet of the paint conduit spirally wound in the cylinder of the structure is inserted and fixed to the paint feed-through hole, and the outlet of the paint conduit is inserted and fixed to the communication hole communicating with the paint passage.

[0011]

[Action]

 Since the present invention is configured as described above, not only when the pressure caused by the paint supply at the time of starting the operation of the coating gun is applied to the insulating hose contained in the cartridge type container, but also when the temperature during the operation is stopped. Even if condensation occurs around the insulating hose contained in the cartridge-type container, the wound insulating hose will not cause the inconvenience of degrading the insulating function.

[0012]

【Example】

 The rear members 1A and 1B of the coating gun main body 1 are provided at the rear end thereof with a high voltage cable penetrating mechanism 1C and a paint feeding penetrating mechanism, each of which is composed of a grounding conductive member attached to the rear members 1A and 1B, and paint atomizing air feeding in the same manner as 1D. An injection penetration mechanism (not shown) and an atomized paint pattern forming air injection penetration mechanism (not shown) are formed so as to be attached.

A cap 2 is attached to the front end of the coating gun body 1. In front of the coating gun body 1, a paint passage 4 for sending the paint under pressure to a paint charging high-voltage applying portion 3 formed by a cap 2 and a front member of the painting gun body 1, and a paint mist formed in the cap 2. Along with the atomized air injection hole 5, an air supply path (shown by a chain line) for sending air to each of the air passages 7 and 8 for sending air under pressure to the pattern forming air injection hole 6 for atomized paint. In addition, from the high-voltage static electricity application unit 3 for paint charging, which houses the high-voltage cable 9, the high-voltage rod 10, and the electrode guide 11 that constitute the high-voltage static electricity supply unit and is formed by the front member of the coating gun body 1 and the cap 2. The electrode 12 is projected through the paint injection hole 3A of the cap 2 through the electrode guide 11.

A feature of the present invention is that, as shown in FIG. 1, an insulating hose having a calculated thickness and length is spirally wound in place of the paint supply passage arranged in a conventional coating gun. The paint conduit 20 is formed, and the paint conduit 20 wound in a spiral shape is accommodated in a cartridge type container 21 so that the winding interval is kept constant and the interval does not change. The inlet of the paint conduit 20 stored in the container 21 is joined to the paint penetration hole formed in the paint penetration mechanism 1C made of a grounding conductive member attached to the rear member 1A, and the paint conduit 20 is The outlet is configured as a paint supply passage that can be mounted by being joined to the paint passage 4 formed in the front member of the painting gun body 1.

The location where the cartridge type container 21 accommodating the paint conduit 20 is arranged is to avoid the location where the high voltage supply section and each air supply section installed inside the coating gun main body 1 are arranged, and to place the inside of the coating gun main body 1 inside. A paint conduit storage chamber 22 of the dug-out type is formed, and the cartridge type container 21 constituting the paint supply passage having the above-mentioned configuration is housed and arranged therein.

As shown in FIG. 3, the cartridge type container 21 that houses the spirally wound paint conduit 20 has, for example, a spiral guide wall 21B formed inside the cylindrical body 21A of the cartridge type container 21, The base member 21C of the cylindrical body 21A of the cartridge type container 21 communicates with the paint feed through guide hole penetrating the paint feed through mechanism 21C formed by the grounding conductive member attached to the rear member 1A of the coating gun body 1. With a screwing mechanism, the tip of the cylinder 21A can be hermetically fitted to the cylinder 21A with a lid 21D provided with a communication hole 21E communicating with the paint passage 10 formed in the front member of the coating gun body 1. Thus, the inlet and outlet of the spirally wound coating conduit 20 can be connected to the communication holes provided in the base portion 21C and the lid portion 21D, respectively.

Since the cartridge type container 21 of the present invention is configured as described above, in order to accommodate the paint conduit 20 therein, the paint conduit 20 is spirally wound and the tip of the paint conduit 20 is In order to match the communication hole of the base member 21C of the cylindrical body 21A, the spiral guide wall 21B formed inside the cylindrical body 21C is twisted and screwed into the communication hole. The rear end of the paint conduit 20 is inserted into the communication hole of the lid 21E, which is the tip member, and the cylinder 21A is sealed by the lid 21E. Of course, the tip end of the spirally wound paint conduit 20 is inserted into the communication hole of the base portion 21C of the cylindrical body 21 in an airtight manner, and the rear end of the paint conduit 20 is sealed in the communication hole of the lid portion 21E. The cartridge type container 21 itself is made to be an airtight container by inserting the cartridge type container 21 by inserting it. Insulating oil and insulating gas may be enclosed in the cylindrical body 21A to enhance the insulation of the paint supply passage.

That is, the communication hole of the base end member 21C of the cylindrical body 21A constituting the cartridge container 21 is communicated with the paint feed through guide hole of 1C of the paint feed mechanism of the rear member 1A of the coating gun body 1, A communication hole 21E formed in a lid 21E provided as a tip member of the cylinder 21A communicates with a paint passage 10 formed in a front member of the coating gun body 1. The spirally wound paint conduit 20 may be mounted and fixed in the cylindrical body 21A as long as the paint is not leaked.

The operation will be described below. Operate the high-voltage static electricity generator, high-pressure air supply device, and paint supply device (neither shown). As a result, high-voltage static electricity passes through a high-voltage cable (not shown), from the high-voltage rod 10 forming the high-voltage static electricity supply section of the coating gun body 1 through the electrode guide 11, and then the high-voltage static electricity application section for paint charging. 3 is applied to the needle-shaped electrode 12 which is a high-voltage static electricity applying member for charging the paint, which is mounted in the electrode guide 11, and is discharged to the grounded object. Further, the paint passes through a hose (not shown), a paint feed-through mechanism 1C, a paint conduit 20 formed by a coil-shaped insulating hose housed in a cartridge type container 21, a paint gun main body 1 From the paint passage 4 formed in the front member, the paint enters the paint charging high-voltage static electricity applying portion 3 and is sprayed from the tip of the paint spraying hole 3A provided in the cap 2. Further, the air passes through the respective hoses, the respective air feed-through mechanisms, the air supply passages (not shown), the air passages 7 and 8, and has a screw ring 2A on the front member of the coating gun body 1. It is sprayed from the paint atomizing air injection hole 15 and the pattern forming air injection hole 6 of the atomized paint, which are provided in the attached cap 2. The paint sprayed from the paint spray hole 3A is atomized by the air sprayed from the spray atomized air spray hole 5, and the needle-shaped electrode 12 to which a high voltage is applied and the grounded object (not shown). The corona discharge field generated during the period of time is electrified and flies and is applied to the object to be coated. Pattern formation of atomized paint The air ejected from the air ejection holes 6 is used to apply the atomized paint to the surface of the object to be coated in a desired coating pattern.

In this case, in the case of a solid paint which is often used in general industrial coating, it has a high resistance value and is in contact with the grounding conductive member through the paint passing through the paint conduit and is in a grounded state. It does not prevent the electrostatic coating from being performed by connecting to an automatic valve device (not shown). In addition, until now, due to its electrical conductivity, a bridging phenomenon occurs due to the effect of a grounding object approaching the paint conduit, which causes it to pass through to the conductive part for grounding, and as a result electrostatic coating cannot be performed. Even in the case of using metallic paint with a cartridge, the paint container is a cartridge type container in which a long hose of electrical insulation is wound in a spiral shape many times and is formed with an insulating material. It will be installed in the paint gun main body 1 which is housed in 21 and is covered with an electrically insulating member. Therefore, even if a ground object comes into contact with the paint gun main body, the metallic paint flowing through the paint conduit The bridging phenomenon is less likely to occur, and above all, the winding of the paint conduit in multiple layers increases resistance to leakage current from the high-voltage static electricity applying part for paint charging, and the paint conduit flows. Bridging phenomenon does not occur since so as to maintain the metal component to the uniformly dispersed state in the paint that. Therefore, even though the automatic valve device is grounded, good and safe electrostatic coating can be performed.

By the way, a feature of the present invention is that a paint hose made of an insulating material having a calculated thickness and length is used to make a spirally wound paint conduit 20, which is stored in a cartridge type container 21. That is, it is installed in the paint conduit accommodating chamber 22 formed in the painting gun main body 1 as described above, avoiding the high-voltage static electricity supplying section for accommodating the air supply path and the high-voltage rod 9.

With this configuration, a paint having a high resistance value uses a thick and short paint hose, and a paint having a low resistance value can be used by winding a thin and long paint hose in multiple layers. Then, if this paint hose is constructed so that it can be accommodated in the cartridge type container having such a condition, the paint hose can be used according to the paint used. Also, it is a matter of course that it is convenient to replace the metallic coating adhered in the coating conduit when cleaning it.

With such a configuration, the high-voltage static electricity supply unit accommodating chamber that accommodates the high-voltage static electricity supply unit, which is the high-voltage static electricity supply unit, and the air supply path arranged in parallel with the high-voltage static electricity supply unit accommodating chamber are further provided. It can be surrounded by the thick insulating material that composes No. 1, and the paint conduit is constructed by winding a hose made of insulating material in a spiral shape and accommodating it in the paint gun body. Since the outer periphery reduces the influence of static electricity from the paint conduit as much as the high voltage rod, it is possible to reduce dust adhesion to the outer periphery of the coating gun body as much as possible. In addition, even if the paint supply and air supply were temporarily stopped while the coating gun was in operation, the paint (metalic paint) remaining in the paint supply line would leak electricity and cause the safety device to operate unnecessarily. As mentioned above, there was such a problem.

Moreover, by constructing the paint supply path as in the present invention, when the paint remaining in the spirally wound paint conduit stops flowing, the paint A is coiled as shown in FIG. Settles in the wound part of the paint conduit 20 made of insulated hose wound on the air, and the air B floats on the opposite wound part, so that the upper part of the paint conduit 20 floats above the discontinuity of air. As a result, an insulator is formed, and the lower part becomes a reservoir for residual paint (metallic paint), interrupting the continuity of the paint in the paint conduit 20 and preventing electrical leakage through this phenomenon. can do.

[0025]

[Effect of device]

 As described above, according to the air atomization type electrostatic coating gun of the present invention, a long paint conduit is wound into a coil so as to be integrated with the coating gun and covered with an electrically insulating member. Since it is installed inside the main body of the painting gun, the installation space can be made extremely small and the size can be reduced, and good painting can be performed even when using such solid or metallic paint. In addition, in the conventional type in which the paint conduit is attached to the outside of the painting gun, since a long paint conduit is exposed, it is close to the ground object, which may cause a spark to cause a fire. In contrast, according to the invention, the paint conduit emerges as an electrically insulating hose, which is further housed in a painting gun body made entirely of electrically insulating material and in a cartridge-type container made of electrically insulating material. Therefore, even if the coating gun comes into contact with an object installed in the vicinity, the effect of preventing the occurrence of a fire due to a spark also occurs.

Furthermore, since the metallic paint is supplied in a warmed state, when the paint supply is stopped, the metallic paint remaining in the paint conduit cools, which may cause dew condensation around the paint conduit. become. When the paint supply is restarted in this state, it is conceivable that the winding interval of the spirally wound paint conduit is narrowed by the paint supply pressure. In this case, the insulation may be destroyed due to the dew condensation around the wound paint pipe. However, in the present invention, since the paint conduit is housed in the cartridge type container so as not to change the winding interval, such a fear can be eliminated. Furthermore, by enclosing the insulating liquid or the insulating gas in the cartridge type container, the insulating property can be further secured.

[Brief description of drawings]

FIG. 1 is a sectional view showing a state where a cartridge type paint supply passage of the present invention is arranged in an air atomization type electrostatic coating gun.

FIG. 2 is a cross-sectional view showing a state in which an insulating effect is exerted in a paint hose constituting a cartridge-type paint supply passage according to the present invention.

FIG. 3 is a sectional view of a cartridge type paint supply passage according to the present invention.

[Explanation of symbols]

 20 spirally wound paint conduit 21 cartridge type container 21A cylinder 21B spiral guide wall 21C base member 21D lid

Claims (1)

[Scope of utility model registration request] 1. A paint feeding mechanism of a paint feeding mechanism formed on a painting gun main body, to a base end member of a cylindrical body provided with a threaded wall for a paint conduit which is a spirally wound paint hose inside. A communication hole that communicates with a paint feed through hole formed in the mechanism is provided, and a communication hole that communicates with a paint passage formed in the coating gun main body is provided in the lid portion that is the tip member of the cylinder body. An air atomization type electrostatic coating gun characterized in that the inlet of the paint conduit spirally wound into the paint feed through hole and the outlet of the paint conduit are fixedly inserted into a communication hole communicating with the paint passage. Cartridge type paint supply path to be placed in.