JPS594186B2 - Sadent Sou Souchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides paint discharge holes 1 arranged in a plurality of annular rows.
A rotating body 2 having ... on its tip surface is rotated at high speed,
A metal cylindrical body 4 having a knife edge portion 3 at its tip and freely attachable to the outer circumferential surface of the rotary body 2 is arranged to have an opening diameter of the knife edge portion 3 or a taper angle of the inner surface of the cylindrical body 4 reaching the knife edge portion 3. Multiple tubes are formed with different diameters, and one of them is selected depending on the purpose of painting.

The cylinder body 4 is coaxially disposed on the outer periphery of the tip of the rotary body 2.
The knife edge portion 3 of the paint discharge hole 1 is made to protrude forward within a range of 20 mm or less from the opening 5 of the paint discharge hole 1, and a high voltage is applied between at least the cylinder body 4 and the object to be painted □. The purpose of the electrostatic coating device is to make the atomized particles finer than before when atomizing the supplied liquid paint, so that a good painted surface can be obtained. To provide an electrostatic coating device 10 which can improve the efficiency of coating work and obtain a coating pattern range according to the purpose of coating. An embodiment of the present invention will be described in detail below with reference to the drawings.

2 is a rotating body made of cylindrical metal, and a disc-shaped base 11 is integrally provided on the inner peripheral surface slightly toward the rear, and the base 11 divides the inside of the rotary body 2 into a front chamber and a rear chamber 15. The front inner circumferential surface and the rear inner circumferential surface of the rotating body 2 are continuous through a tunnel section 12 provided in the base body 11, and the inner circumferential surface of the rotating body 2 is continuous. is formed in a shape whose diameter increases toward the front.

A rotating shaft 8 is led out from the center of the rear surface of the base body 11, and the rotating shaft 8 is
The rear end of the zero rotation shaft 8 is connected to an output shaft 9a of an air motor 9. The rotating shaft 8 is formed into a hollow pipe shape with a pipe hole 10, and high pressure air is introduced into the pipe hole 10 at a bearing portion 30. On the other hand, on the peripheral surface of the tip end of the pipe hole 10 of the rotating shaft 8, a through hole 1 is formed in a radial shape in the base body 11.
3 is bored, and the other end of the through hole 13 is open to the outer peripheral surface of the rotating body 2. Further, an annular inner protrusion 14 is integrally formed on the inner circumferential surface of the tip end of the rotating body 2, and the inner protrusion 14 has a paint discharge hole 1 penetrating its front and rear surfaces.
are drilled, and the paint discharge holes 1 are arranged in a row at equal intervals in a ring shape, and the paint discharge holes It opens at the tip end surface and at the inner circumferential surface of the rotating body 2. 4 is rotating body 2
It is a cylindrical body fitted on the front outer periphery of the cylindrical body 4, and is made of 15 metal like the rotating body 2. A knife edge portion 3 is formed by making the peripheral edge of the distal end of the body 4 sharp.

The cylindrical body 4 is closely fitted to the outer circumferential surface of the rotary body 2 in front of the opening of the through hole 13. A plurality of types of cylindrical bodies 4, 4a are prepared depending on the difference in the taper angle of the inner circumferential surface. Further, when the cylinder 4 is closely fitted to the front outer periphery of the rotor 2, the knife edge portion 3 of the cylinder 4 is connected to the paint discharge hole 1 on the front end surface of the rotor 2.
The liquid paint that is continuously discharged from the paint discharge hole 1 is blown away by the centrifugal force of the rotating body 2 that rotates at high speed, and this blown away liquid paint is The liquid paint is made to collide with the inner circumferential surface of the cylinder 4 slightly on the inner side of the knife edge portion 3. 1
Reference numeral 5 denotes a second cylindrical body that is fitted onto the outer periphery of the rotating body 2 so that the front half thereof covers the outer periphery of the cylindrical body 4, and a protrusion 16 that is provided protrudingly on the inner circumferential surface of the rear end of the second cylindrical body 15. The inner surface is connected to the through hole 13 of the rotating body 2.
High-pressure air is sent from the through hole 13 to an air chamber 17 formed between the outer circumferential surface of the rotating body 2, the outer circumferential surface of the cylinder 4, and the inner circumferential surface of the second cylinder 15, which is brought into close contact with the outer peripheral surface rearward of the opening. It is designed so that it can be inserted.

The inner peripheral surface of the tip of the second cylinder 15 is the knife edge portion 3 of the cylinder 4.
It is arranged with a gap to the outer peripheral surface slightly more rearward,
The gap is used as a dinit nozzle 6 to form an annular dinit airflow jetting around the outer periphery of the knife edge portion 3. Further, the second cylindrical bodies 15, 15a are formed in a plurality of types in conjunction with the cylindrical bodies 4, 4a formed in a plurality of types as described above, and in this case, the cylindrical bodies 4, 4a corresponding to the husband and husband and the second cylindrical body 15 and 15a are combined in advance to form attachments Al and A2 for changing the coating pattern, these attachments A, and A2 are selected according to the spread of the intended coating pattern, and these attachments are attached to the outer periphery of the rotating body 2. The selected attachment A or A2 is fitted. 1
Reference numeral 8 denotes a paint supply pipe, and the liquid paint is continuously supplied downward from its tip 19 to the rear inner circumferential surface of the rotating body 2. The paint supply pipe 18 is connected to a support 21 at the tip of an insulating arm 20. The paint tube 23 has one end connected to the paint supply source 22, and the other end of the paint tube 23 connected to the rear end of the paint supply pipe 18.

24 is an air supply source which supplies high pressure air to the air motor 9 and the bearing section 30 through the air tubes 25 and 26 to rotationally drive the air motor 9, and also from the bearing section 30 to the pipe hole 10 of the rotating shaft 8 and the base body 11. High-pressure air is fed into the air chamber 17 through the through hole 13, and an annular cylindrical dinit airflow of high-pressure air is formed from the dinit nozzle 6 around the outer periphery of the knife edge portion 3.

27 is a high voltage generation source, which is connected to a terminal 29 provided on the bearing portion 30 via an electric wire 28, and applies high voltage to the knife edge portion 3 of the cylindrical body 4 via the air motor 9, the rotating shaft 8, the base 11, and the rotating body 2. is applied.

Further, the object to be painted 7 is kept at ground potential. Thus, in the above embodiment, the liquid paint flowing down from the tip of the paint supply pipe 18 onto the rear inner peripheral surface of the rotating body 2 is uniformized in the circumferential direction as the rotating body 2 rotates, and at the same time is in a high speed rotation state. Due to the centrifugal force of the rotating body 2, the liquid paint moves forward along the taper of the inner circumferential surface of the rotating body 2, and the liquid paint that has passed through the tunnel portion 12 and reaches the front inner circumferential surface of the rotating body 2 moves further forward. , and finally reaches the posterior surface of the medial ridge 14.

After this, the liquid paint on the rear surface of the inward protrusion 14 gradually enters the paint discharge hole 1, and the liquid paint that has passed inside the paint discharge hole 1 is rapidly discharged from the opening 5 of the paint discharge hole 1 by the action of centrifugal force. The droplet-like or string-like liquid paint that is blown outward and blown away from this opening 5 collides with the inner circumferential surface of the knife edge portion 3 of the cylinder 4, and the impact force at the time of this collision causes it to become a large thin film. The liquid paint is immediately electrostatically atomized extremely finely at the knife edge portion 3, and the liquid paint is
The action of the dinit airflow jetting around the outer periphery synergistically atomizes and promotes atomization, and the atomized paint particles are given an initial velocity by the action of the dinit airflow and are exposed to the electrostatic field. A bundle of atomized paint flying in the direction of the object to be painted 7 is created by the annular cylindrical dinit airflow which is ejected from the dinit nozzle 6 which is simultaneously rotating with the rotating body 2 and flows in a spiral shape. This prevents the atomized paint from scattering in unnecessary directions, and also ensures good dispersion of the atomized paint in a plane perpendicular to the flying direction in the flux of the atomized paint. A uniform coating pattern is formed with a spread corresponding to the painted cylinders 4, 4a. In addition, in the present invention, the paint discharge hole 1
The knife edge portion 3 of the cylinder 4 is made to protrude forward within a range of 20 degrees or less with respect to the opening 5 of In particular, the amount of forward protrusion is determined in relation to the inner diameter of the knife edge portion 3, and the opening diameter of the knife edge portion 3 is small and close to the opening portion 5, as in the case of the cylinder 4 of the illustrated embodiment. (For example, within a range of several mm) Cylindrical body 4
exists, the forward protrusion amount of the knife edge portion 3 is 10
mm or less, and even when the opening diameter of the knife edge portion 3 is large like the cylinder 4a and the cylinder 4a is quite far away from the opening 5 (for example, several CrIL), the maximum
If the knife edge portion 3 protrudes by more than 0 m1L, good atomization as aimed at in the present invention cannot be obtained.

That is, in the present invention, most of the liquid paint blown away in the radial direction from the opening 5 by the action of centrifugal force collides with the inner circumferential surface of the cylinders 4, 4a near the knife edge portion 3, and due to this impact force. The thinned liquid paint is supplied to the knife edge part 3, where it is electrostatically atomized, and the liquid paint thrown off by the action of centrifugal force is atomized by the knife edge. Cylindrical body 4, 4a near part 3
Since the liquid paint is made into an extremely thin film by using the impact force when it collides with the inner circumferential surface, the knife edge portion 3
When atomizing is performed synergistically by the electrostatic action and the action of the dinit airflow, the particles of the atomized liquid paint are made much finer than those of various conventionally known electrostatic coating devices. It is possible to form a good coating film. However, in the above embodiment, when the attachment A is selected and fitted onto the rotating body 2, since the opening diameter of the knife edge portion 3 of the cylinder 4 constituting the attachment A is small, the attachment is concentrated in a relatively small area. On the other hand, when attachment A2 is selected and the rotating body 2
When fitted into the cylindrical body 4 constituting the attachment A2
Since the opening diameter of the knife edge portion 3 of a is large, a coating pattern that spreads over a relatively wide range can be obtained, and a wide area can be coated at once. In addition, in the above embodiment, when the forward protrusion amount of the knife edge portion 3 becomes O or less, atomization is performed almost solely by the action of the dinit airflow and the flight direction of the atomized paint is regulated, resulting in a good static state. There is a problem that electric coating cannot be obtained, and if the forward protrusion amount exceeds 20 mm, no matter how large the diameter of the cylindrical body 4 is,
Even when using this method, fine atomized particles as aimed at by the present invention cannot be obtained.

Furthermore, in the above embodiment, an annular cylindrical dinit airflow is jetted around the outer periphery of the knife edge portion 3 of the cylinder body 4, but the present invention is limited only to what forms such dinit airflow. Instead, the cylindrical bodies 4, 4a may simply be disposed on the outer periphery of the tip of the rotating body 2 in a detachable and replaceable manner. As described above, in the present invention, the cylindrical body is coaxially disposed on the outer periphery of the tip of the rotary body, and the knife edge portion of the cylindrical body is made to protrude forward within a range of 2011 m or less from the opening of the rotary body paint discharge hole. Therefore, the liquid paint discharged from the opening of the paint discharge hole and blown outward by the action of the centrifugal force acting on the rotating body collides with the inner circumferential surface of the cylinder, and the impact force at the time of this collision improves the quality of the liquid paint. Moreover, as mentioned above, the liquid paint that is blown away from the opening of the paint discharge hole collides with the inner circumferential surface of the cylinder, and the impact force at the time of this collision makes it possible to reduce the thickness of the liquid paint. Since it is used to obtain a thin film, it is possible to efficiently form a large amount of liquid paint into a good thin film.If a cylinder with a large opening diameter at the knife edge is used, a large amount of liquid can be formed from a relatively small rotating body. Even when the paint is continuously supplied, it can be made into a thin film to obtain fine atomized particles, and the liquid paint can be made into a thin film by the impact force at the time of impact. This has the effect that the thickness of the paint can be made thinner and finer paint particles can be obtained when atomized at the knife edge portion.

Furthermore, in the present invention, a plurality of metal cylindrical bodies that can be freely attached to the outer peripheral surface of the rotating body are formed with different opening diameters of the knife edge portions and different taper angles of the inner surface of the cylindrical bodies leading to the knife edge portions, One of the cylinders selected according to the purpose of painting is arranged coaxially around the outer periphery of the tip of the rotary body, so it can be used to It is possible to obtain a coating pattern according to the purpose of coating, such as the degree of spread of the arrangement, and in this case, since the main parts of the equipment such as the rotating body and air motor are used for the same purpose, all that is required is the replacement of the cylinder (or attachment). This has the effect of making it possible to easily change the coating pattern.

[Brief explanation of drawings]

Fig. 1 is a front view when attachment A according to an embodiment of the present invention is selected, Fig. 2 is a cross-sectional view taken along the line X-X of the same, Fig. 3 is a schematic diagram of the same as the above in use, and Fig. 4 is the same as the above. Figure 5 is an enlarged sectional view of the paint discharge hole and knife edge portion of the above, and Fig. 5 is a cross-sectional view when the same attachment A2 is selected. , 5 is an opening, 6 is a dinit nozzle, and 7 is an object to be coated.

Claims (1)

[Claims] 1. A rotating body having a large number of annular rows of paint discharge holes on its tip surface is rotated at high speed, and a metal cylindrical body having a knife edge portion at the tip and which can be freely attached to the outer peripheral surface of the rotating body is cut into a knife. A plurality of cylinders with different opening diameters at the edge or taper angles on the inner surface leading to the knife edge are formed solidly, and one of the cylinders selected according to the purpose of coating is placed on the outer periphery of the tip of the rotating body. The knife edge portion of the cylindrical body is coaxially arranged so as to protrude forward within a range of 20 mm or less from the opening of the paint discharge hole, and a high voltage is applied at least between the cylindrical body and the object to be coated. An electrostatic coating device characterized by: