JP2001205143A - Electrostatic coating machine used as two type and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrostatic coating machine used as a rotary atomization type coating machine and an air atomization type coating machine by only exchanging a part of components and its method. SOLUTION: The electrostatic coating machine 1 has a common coating machine main body 3, an atomizing head 5 and a rotary atomizing head 7 capable of being mounted on the coating machine main body 3, and when the atomizing head 5 is mounted on the coating machine main body 3, the machine is used as the air atomization type coating machine, and when the rotary atomizing head 7 is mounted on the coating machine main body 3, the machine is used as the rotary atomization type coating machine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic coating machine, and more particularly, it can be used as an air atomizing type coating machine or a rotary atomizing type coating machine as required. Related to the coating machine.

[0002]

2. Description of the Related Art In electrostatic coating, a paint is applied to an object to be coated by an electrostatic field. Among the coating machines for performing this, a rotary atomizing type coating machine and an air atomizing type are used. There is a chemical coating machine. Rotary atomizers apply a charge to the paint by corona emitted from the edge of a rotating body such as a bell, thereby separating the paint into fine particles.On the other hand, air atomizers use a sprayer. In the same manner as above, the paint is atomized by air.

[0003] The rotary atomizing type coating machine is characterized by good coating efficiency (about 80% or more), but has a drawback that the object to be coated is easily limited to a relatively flat object. On the other hand, the air atomizing type coating machine is inferior to the rotary atomizing type in terms of the coating efficiency, but for example, it can apply even relatively deep objects such as boxes to the rotary atomizing type. Has no features.

[0004] In view of the above, the rotary atomization type and the air atomization type are actually properly used depending on the type of the paint and the object to be coated. Even in the case of manufacturers, the rotary atomization type and the air atomization type are completely different types of coating machines, and are independently developed and sold individually.

[0005]

However, it is a factor of the cost increase for a painter to install two types of coating machines, a rotary atomizing type and an air atomizing type, for proper use. . Also, for the manufacturer,
Manufacturing two different types of coaters separately and managing these parts can be a costly factor.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an electrostatic coating machine and a method thereof which can be used as a rotary atomizing type coating machine and an air atomizing type coating machine simply by replacing some parts. It is in. It is another object of the present invention to provide an electrostatic coating machine in which parts are shared between a rotary atomizing type coating machine and an air atomizing type coating machine.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above technical object, an electrostatic coating machine according to the present invention comprises a common coating machine main body and an air atomizing device which can be mounted on the coating machine main body. A head and a rotary atomizing head, and when the air atomizing head is mounted on the coating machine main body, it becomes an air atomizing type coating machine, and the rotary atomizing head is mounted on the coating machine main body. At times, it is characterized in that it can be selectively used in two types characterized by being a rotary atomizing type coating machine.

Further, the method of the present invention provides a step of preparing a common coating machine main body, a step of preparing an air atomizing head mountable to the coating machine main body, and a step of mounting to the coating machine main body. A step of preparing a rotary atomization head, and, if necessary, a step of selecting the air atomization head and the rotary atomization head, and a step of selecting the air atomization head and the rotary atomization head. The above object can be achieved by providing a method of selectively using two types of electrostatic coating machines, characterized by including a step of mounting the selected head to the coating machine main body. Other objects and advantages of the present invention will become apparent from the following preferred embodiments of the present invention.

[0009]

Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is an exploded view showing the main parts of the coating machine of the embodiment in order to clarify the outline. Reference numeral 1 in the figure denotes an electrostatic coating machine. The electrostatic coating machine 1 has a gun body 3 as a coating machine main body, and first and second removably mountable tips at the tip of the gun body 3. When the first head assembly 5 is attached to the gun body 3, it becomes an air atomizing type coating machine, and when the first head assembly 5 is replaced with the second head assembly 7, It becomes a rotary atomizing type coating machine. That is, the electrostatic spraying machine 1 selectively mounts the first head assembly 5 or the second head assembly 7 to the common gun body 3 to thereby form the air atomizing type spraying machine or the rotating spraying machine. It can be used as an atomizing type coating machine.

FIG. 2 is an overall schematic view of a coating machine 1 to which a first head assembly 5 is attached for use as an air atomizing type coating machine. FIG. 3 is a front view of the coating machine shown in FIG. It is sectional drawing which extracted the part. FIG. 4 is an overall schematic view of a coating machine 1 to which a second head assembly 7 is attached for use as a rotary atomizing type coating machine. FIG. 5 is a front view of the coating machine shown in FIG. FIG. With reference to these drawings, the gun body 3 as a common component will be described first.

The gun body 3 is substantially the same as that of a conventionally known air atomizing type coating machine. That is, the gun body 3 has a central slot 9 located along the axis thereof, and the central slot 9 has a relatively large diameter portion 13 for accommodating the high-voltage cable 11 and a gun body 3.
And a relatively small-diameter intermediate portion 17 located between the distal end opening 15 and the cable housing portion 13. The cable housing portion 13, the intermediate portion 17, The tip opening portions 15 are arranged on the same axis. In addition, the tip opening portion 15
From the intermediate portion 17 side toward the distal end surface 3a of the gun body 3, in order, an elongated portion 15a having a circular cross section, a tapered portion 15b gradually increasing in diameter, and a cylindrical receiving portion 15c having a screw on the inner wall surface. Contains.

A screw is formed on the inner wall surface of the intermediate portion 17 of the central elongated hole 9, and a socket 19 is formed by using the screw.
Is screwed. The socket 19 has a socket 21 having a circular cross section provided at the center of the front end face thereof,
Pin 23 extending between the bottom of the cable and the high-voltage cable 11
And

The front portion of the gun body 3 has a first air port 25 opening at the front end face 3a thereof, and a second air port 27 opening at the tip opening portion 15 of the above-described central elongated hole 9.
Is provided. More specifically, the second air port 27 is provided with a tapered portion 15 b in the distal end opening portion 15.
And an opening at the boundary between the receiving portion 15c provided with a screw. The first air port 25 and the second air port 27 have tubes 29, 3 disposed inside the gun body 3.
Pressurized air is supplied through 1.

The gun body 3 also has a paint introduction port (not shown) which opens at the tip opening 15 of the central elongated hole 9. More specifically, the paint introduction port is opened at an axially intermediate portion of the elongated circular section 15 a of the distal end opening portion 15, and the paint introduction port has a tube 32 (disposed inside the gun body 3). Liquid paint is supplied through FIGS. 2 and 4).

Next, the first head assembly, that is, the head assembly 5 for air atomization, will be described with reference to FIGS. 1 to 3. Includes a retainer ring 33, an air nozzle 35, a paint nozzle 37, and a needle electrode 39.

In order to attach the air atomizing head assembly 5 to the gun body 3, first, the needle electrode 39 is inserted into the central elongated hole 9 of the gun body 3, and The end portion is fitted into the socket 21 of the socket 19 described above. The needle-shaped electrode 39 has, on its rear end surface, a conductive member housing recess 39a arranged along the axial direction, and a metal spring 41 as a conductive member is housed in the recess 39a. Therefore, by fitting the rear end portion of the needle electrode 39 into the socket 21 of the socket 19,
The needle-shaped electrode 39 includes a conductive spring 41 and a conductive pin 2.
3 and electrically connected to the high-voltage cable 11.

Next, the paint nozzle 3 is formed by using a screw 37a formed on the outer peripheral surface of the paint nozzle 37.
7 is a cylindrical receiving portion 1 of the central elongated hole 9 of the gun body 3.
5c. The needle electrode 39 may be incorporated in the paint nozzle 37 in advance, and the integrated needle electrode 39 and the paint nozzle 37 may be mounted on the gun body 3 together.

When the paint nozzle 37 is screwed firmly to the gun body 3, the tapered portion formed at the rear end of the paint nozzle 37 is seated on the tapered portion 15b of the central elongated hole 9, and the seal is formed. Engage. Further, the rear end face of the paint nozzle 37 is engaged with a flange 39b formed at an intermediate portion of the needle-shaped electrode 39 to urge the needle-shaped electrode 39 backward through the flange 39b, whereby the needle-shaped electrode 39 is pressed. The state where the rear end portion of the electrode 39 is securely fitted into the socket 21 of the socket 19 is maintained. Next, the air nozzle 35 is mounted on the paint nozzle 37, and the inner peripheral screw 33 a of the retainer ring 33 is screwed into the outer peripheral screw 3 b at the tip end of the gun body 3.
3 is used to bring the air nozzle 35 into close contact with the paint nozzle 37.

The air atomizing head assembly 5 mounted on the gun body 3 in this manner is provided with the paint nozzle 37.
However, at the boundary between the tapered portion 15b and the receiving portion 15c of the central elongated hole 9 of the gun body 3, an annular air passage 43 communicating with the second air port 27 is formed. Through an atomizing air passage 45 inside the air nozzle 37, the air chamber 47 communicates with an air chamber 47 defined by the tip end surface of the paint nozzle 37 and the air nozzle 35. And an annular gap between the needle-shaped electrode 39.

In the air atomizing head assembly 5, an annular air passage 49 is formed in a portion communicating with the first air port 25 of the gun body 3 in cooperation with the retainer ring 33 and the air nozzle 35. The passage 49 is connected to the air nozzle 35 via the pattern air passage 51 in the air nozzle 35.
Nozzle hole 35b.

From the above description, as can be understood by those skilled in the art, the injection hole 3 of the air nozzle 35 is provided from the first air port 25.
A series of paths leading to 5b constitute a pattern air passage. In addition, a small hole 35a at the center of the air nozzle 35 from the second air port 27 (annular gap around the needle electrode 39)
A series of paths leading to the nozzle constitute an atomizing air passage, and the air discharged from the central small hole 35a of the air nozzle 35 is connected to the outside through the paint nozzle 37 from the above-described paint introduction port, similarly to the related art. Atomizes the paint to be discharged. Thus, the head assembly 5 for air atomization is used.
The operation of the coating machine 1 equipped with is the same as a conventional general air atomization type coating machine.

Next, the second head assembly, that is, the rotary atomizing head assembly 7 will be described with reference to FIGS. 1, 4, and 5. The rotary atomizing head assembly 7 has the following components. It includes an outer shape ring 55, an inner shape ring 57, a bell 59, an air motor 61, and a paint supply tube 63 made of a conductive material such as metal.

In the case of the rotary atomizing head assembly 7,
The other components except for the paint supply tube 63 are assembled in advance and prepared as a primary assembly 65. To attach the head assembly 7 to the gun body 3, first, the paint supply tube 63 is connected to the gun body 3. The paint supply tube 63 is inserted into the center slot 9 and is fixed to the receiving portion 15c of the center slot 9 of the gun body 3 by using a screw 63a provided at a rear portion of the paint supply tube 63. .

That is, the paint supply tube 63 made of a conductive material has an intermediate portion in the axial direction, that is, a tapered portion 15 b in the distal end opening portion 15 of the gun body 3.
And a fastening portion 63b having an outer shape corresponding to the cylindrical receiving portion 15c. The outer peripheral screw 63a formed in the fastening portion 63b is used to remove the screw of the cylindrical receiving portion 15c of the gun body 3. The paint supply tube 63 is fixed to the gun body 3 by being screwed into 3a.

As a result, the rear end portion of the paint supply tube 63 is fitted into the socket 21 of the socket 19, similarly to the case of the needle electrode 39 of the air atomizing head assembly 5. The paint supply tube 63 has a conductive member accommodating recess 63c disposed at the rear end face thereof along the axial direction, and the recess 63c is provided with the first head assembly 5 described above.
Similarly, the conductive spring 41 is housed. Therefore, by screwing the metal paint supply tube 63 to the gun body 3, the rear end portion of the paint supply tube 63 is connected to the socket 19 similarly to the needle electrode 39 of the first head assembly 5. The conductive paint supply tube 27 is inserted into the receptacle 21 so that the conductive
And electrically connected to the high-voltage cable 11 via the conductive pin 23.

Next, the primary assembly 65 is
The primary assembly 65 is mounted on the gun body 3 by screwing it to the outer peripheral screw 3b at the tip of the gun body 3 using a screw 61a formed in a recess in the rear end surface of the gun body 3.
Although the air motor 61 illustrated here is of a bearing type provided with a bearing 61b, it may be of a conventionally known air bearing type.

The air motor 61 includes a motor main body 67 and a case 69 made of an insulating plastic material surrounding the motor main body 67, and a bell 59 is attached to a distal end portion of an output shaft 71 of the motor main body 67. This output shaft 71
The hollow output shaft 71 is formed of a metal hollow shaft, and a paint supply tube 63 is coaxially arranged at a distance from the hollow output shaft 71. The rear end of the output shaft 71 protrudes slightly rearward from the motor body 67, and this protruding portion 71
A space holding member 73 for positioning the output shaft 71 with respect to the paint supply tube 63 is screwed using a screw formed on the outer peripheral surface of a. The spacing member 73 is made of a conductive metal, and the paint supply tube 63 and the conductive output shaft 71 are electrically connected via the metal member 73. Then, by this, the conductive pins 23, the conductive springs 41,
Paint supply tube 63, spacing member 73, output shaft 71
Then, an electric path is formed to the bell 59 through the above, and an electrostatic field is formed between the tip edge of the bell 59 and the object to be coated.

Plastic case 6 of air motor 61
9, a first internal passage 75 communicating with the first air port 25 and a second internal passage 77 communicating with the motor main body 67 are formed. The first internal passage 75 has an annular inlet 75 a facing the outlet of the first air port 25, and an annular outlet 75 opening to a shaping passage 79 formed by the outer shape ring 55 and the inner shape ring 57 cooperating with each other.
b.

Further, the second internal passage 77 has an annular inlet 77a located adjacent to the fastening portion 63b of the paint supply tube 63. A plurality of through-holes 63d extending along the axis are formed in the outer peripheral portion of the fastening portion 63b of the paint supply tube 63, and the plurality of through-holes 63d are arranged apart from each other in the circumferential direction. The second air port 27 and the second internal passage 77 can be reliably connected by the through hole 63d and the annular inlet 77a of the fastening portion 63a.

From the above description, as will be understood by those skilled in the art, a series of paths leading from the first air port 25 to the shaping passage 79 via the first internal passage 75 constitutes a shaping air passage. Pressurized air passing through the shaping air passage is supplied to the outer shaping ring 5.
The liquid is discharged from a gap between the tip of the inner shape ring 57 and the inner shape ring 57. Further, the pressurized air introduced from the second air port 27 into the second internal passage 77 causes the air motor 61 to rotate.
Is driven, whereby the bell 59 rotates at a high speed.

As can be understood from the above description, according to the coating machine 1 of the embodiment, the gun body 3 is a common part, and the first head assembly 5 or the second head assembly 7 is selectively used. By being mounted on a, it can be used as an air atomizing type coating machine or a rotary atomizing type coating machine. More specifically, according to the coating machine 1 of the embodiment, the rotary atomizing coating machine is prepared by using the conventionally known air atomizing coating machine as it is and preparing the second head assembly 7. Can also be used as When the rotary atomizing type coating machine is used, the bell 5 is connected to the high voltage cable 11 via the coating material supply tube 63 and the spacing member 73.
9 is supplied with electrical energy.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to this, and includes, for example, the following modifications. (1) In the above-described embodiment, the second head assembly, that is, the rotary atomizing head assembly 7 is attached to the gun body 3 mainly of the air atomizing type coating machine,
The example in which the coating machine 1 is used as a rotary atomizing type coating machine has been described. By installing the assembly 5, the coating machine 1 may be used as an air atomizing type coating machine.

(2) In the above-described embodiment, the shaping air of the rotary atomizing type coating machine is obtained by using the first air port 25 constituting the pattern air passage in the air atomizing type coating machine, and the atomizing air is obtained. The second air port 27 forming the passage for the motor is used to obtain the air for driving the motor of the rotary atomizing type coating machine, but this is reversed and the first air port 25 is used to obtain the rotary atomizing type coating air. The air for driving the motor of the machine may be obtained, and the shaping air of the rotary atomizing type coating machine may be obtained using the second air port 27 constituting the passage for the atomizing air.

(3) In the above embodiment, the air and the paint are supplied to the air atomizing head assembly 5 and the rotary atomizing head assembly 7 through the inside of the gun body 3. The air and / or paint may be supplied directly to the rotary atomizing head assembly 7 and the air atomizing head assembly 5 without the interposition of the body 3. (4) In the above-mentioned embodiment, the explanation was made by taking the coating machine for liquid paint as an example. However, the present invention can be similarly applied to powder paint.

(5) In the above-described embodiment, the head assembly 5 for air atomization and the head assembly 7 for rotary atomization are directly attached to the gun body 3, but the attachment is attached to the gun body 3. In addition, the air atomizing head and the rotary atomizing head may be attached to this attachment with one touch. (6) When the gun body, the head for air atomization, and the head for rotary atomization are attached via an attachment, for example, as in the above modified example (5), for example, a swing mechanism is provided on the attachment. The head for air atomization and the head for rotary atomization may be able to swing.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an exploded view of an electrostatic coating machine of the present invention.

FIG. 2 is an overall view of a coating machine equipped with a head for air atomization.

FIG. 3 is a sectional view illustrating a front portion of the coating machine in FIG. 2 in an extracted manner.

FIG. 4 is an overall view of a coating machine equipped with a rotary atomizing head.

FIG. 5 is a sectional view illustrating a front portion of the coating machine in FIG. 4 in an extracted manner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electrostatic coating machine 3 Gun body (coating machine main body) 5 Air atomizing head assembly 7 Rotating atomizing head assembly 9 Center long hole 11 High voltage cable 19 Socket 21 Socket recess 25 First air port 27 Second air port 39 Needle electrode 63 Paint supply tube

Claims (4)

[Claims] 1. An air atomizing head and a rotary atomizing head that can be mounted on a common coating machine main body, and the air atomizing head is mounted on the coating machine main body. Sometimes, it becomes an air atomizing type coating machine, and when the head for rotary atomization is mounted on the main body of the coating machine, it becomes a rotary atomizing type coating machine. Machine. 2. The coating machine main body has a hole opened at a tip end surface of the coating machine main body, and the hole is provided with a high-voltage cable and a socket electrically connected to the high-voltage cable. The socket includes a recess for receiving a rear end portion of a needle electrode which is an element of the air atomization head and a rear end portion of a paint supply tube which is an element of the rotary atomization head. The electrostatic coating according to claim 1, wherein a supply tube is made of a conductive material, and electric energy is supplied to the bell, which is an element of the rotary atomizing head, via the paint supply tube. Machine. 3. When the air atomizing head is mounted on the coating machine main body, pattern air and atomizing air of the air atomizing head are disposed inside the coating machine main body. Supplied from the second air passage, and when the rotary atomizing head is mounted on the coating machine main body, the rotary atomizing head is supplied through the first and second air passages inside the coating machine main body. The electrostatic coating machine according to claim 2, wherein shaping air for the head and air for driving the air motor are supplied. 4. A step of preparing a common coating machine main body, a step of preparing an air atomization head mountable to the coating machine main body, and preparing a rotary atomization head mountable to the coating machine main body. And, if necessary, a step of selecting the head for air atomization and the head for rotary atomization; and coating the head selected from the head for air atomization and the head for rotary atomization with the coating A method of using the electrostatic coating machine in two types.