JPS6056539B2 - electrostatic painting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION In the present invention, a metal cylinder 5 having a knife edge portion 7 at the front end is attached to the front end of the rotating shaft 1, and the bearing 3 of the rotating shaft 1 is attached to the front end of the rotating shaft 1.
An air chamber 9 is disposed on the outer periphery of the air chamber 9 so as to be freely movable back and forth, and an air outlet 10 is provided on the front wall of the air chamber 9 that opens forward at the rear of the outer periphery of the knife edge portion 7 along the coaxial circumference of the cylinder 5.
A paint supply path for supplying a thin film of paint to the inner periphery of the knife edge portion 7, and a high voltage generator for applying a high voltage between the cylinder and the object to be coated. .

This relates to an electrostatic coating device characterized by To provide an electrostatic coating device that can uniformly coat an object and furthermore, can freely adjust the coating diameter. An embodiment of the present invention will be described in detail below with reference to the drawings.

The cylindrical body 5 has an inner circumferential surface that gradually increases in diameter in a tapered manner from the front and back of the base 3, and the inner circumferential surface at the rear of the base 3 and the inner circumferential surface at the front of the base 3 of the cylindrical body 5 are defined by the plurality of inner circumferential surfaces provided on the base 3. Tunnel section 6...
・The tunnel portion 6... is continuous with the base body 3.
are formed at equal intervals in the circumferential direction on the outer peripheral end of the . Further, a knife edge portion 7 is formed at the tip of the cylinder 5 by making the taper slope of the inner circumferential surface of the cylinder 5 even steeper. Reference numeral 4 denotes a groove provided over the entire inner circumference of the cylindrical body 5.

The tip of the rotating shaft 1 is inserted through the insertion hole provided at the center of the base 3, and a stopper 12 is attached to the male threaded portion 11 at the tip of the rotating shaft 1.
The cylindrical body 5 is attached to the rotating shaft 1 by screwing together the cylindrical body 1'.
rotates coaxially with the rotating shaft 1. A movable base 39 is fitted into a pipe-shaped bearing 2 that rotatably supports the rotary shaft 1 so as to be slidable in the front-rear direction. The movable base 39 can be fixed in place on the bearing 2 by physical means such as a cap screw. The movable base 39 has an annular air chamber 9 in the circumferential direction.
is formed into a hollow shape. A plurality of air outlets 10 are opened on the front surface of the moving base 39 at equal intervals on a circumference coaxial with the cylindrical body 5, and the air chamber 9 is connected to the air outlets through a long and thin air outlet passage 13. 10' communicates with the outside. By forming the air ejection passage 13 in such a long and narrow manner, the air flow can be ejected as a jet stream without being diffused. The air outlet 10 may be formed in the shape of an annular slit on the front surface of the movable base body 39 with a circumference coaxial with the cylindrical body 5. In this case, the air outlet passage 13 is also formed in the shape of an annular slit. An air chamber 9 is provided at one location on the outer periphery of the moving base 39.
An air supply port 14 is opened, and an air tube 30 from a high-pressure air generation source 2 is connected to a supply pipe 15 screwed into the air supply port 14. air tube 3
0 is formed to be flexible so as not to hinder the movement of the movable base 39. Further, a paint supply body 16 is attached to the rear of the moving base 39 of the bearing 3, and the supply vibrator 17 attached to the paint supply body 16 is inserted into the introduction port 19 of the movable base 39, and the tip 17a of the supply vibrator 17 is inserted into the base 3. It is located within the rear inner peripheral surface. The paint supply body 16 is connected in communication with a paint supply section 18 consisting of a paint pump, a paint tank, etc., and paint is continuously supplied from the paint supply section 18 to the supply vibrator 17. The paint supply section 18 uses one that has been insulated with high voltage resistance. A high voltage source 33 is connected to the air pump 20 or the like to apply a high voltage between the object A to be painted and the cylinder 5 or the like. In the figure, 37 is an insulated arm rod, and 38 is a support attachment part for the insulated arm rod 37. In the above embodiment, the paint is supplied from the paint supply unit 18 to the supply vibrator 17 via the paint tube 35, and the tip 1 of the supply vibrator 17 is
A small amount of paint is continuously allowed to flow down onto the rear inner circumferential surface of the cylinder 5 through the opening 7a.

On the other hand, the high-pressure air flow supplied from the high-pressure air generation source 2 through the air tube 36 rotates the air motor 20, drives the rotating shaft 1 connected to the air motor 20, and drives the cylindrical body 5.
Rotate. The paint that has flowed down onto the inner peripheral surface of the cylinder 5 is subjected to centrifugal force due to the high speed rotation of the cylinder 5, and spreads to the rear inner peripheral surface of the cylinder 5, and at the same time spreads onto the taper of the inner peripheral surface of the cylinder 5. It moves in the direction of the tip in a thin film shape, and finally passes through the tunnel part 6 of the base body 3 and is supplied to the front inner circumferential surface of the cylinder 5, and then the front inner circumferential surface of the cylinder 5. Also, it is supplied in the form of a thin film in the direction of the knife edge portion 7 along the taper while expanding in the inner circumferential direction. The paint thus formed into a thin film is supplied to the knife edge section 7, where it is electrostatically atomized by the action of a high electric field caused by a high voltage applied to the cylinder 5, etc. Further, due to the action of this electric field, the atomized paint starts flying in the direction of the object A to be painted, which is kept at the ground potential. On the other hand, the atomized paint is sprayed from the air outlet 10 provided behind the knife edge part 7, and the wind pressure of the annular jet stream causes the paint supplied from the knife edge part 7 to be atomized and atomized. An initial velocity is given to the paint, and the atomized paint is caused to fly in the direction of the object A to be coated by the action of the electric field. The atomized paint, which is atomized by the synergistic effect of the high electric field and the jet stream as described above, is given an initial velocity by the jet stream and is accelerated by the high electric field and flies in the direction of the object A to be painted. However, at the same time, the atomized paint is surrounded by the annular jet stream, preventing the atomized paint from scattering in unnecessary directions.
The flying direction of the atomized paint can be made uniform in the direction of the object to be painted. Further, when the movable base 39 is moved forward, the annular cylindrical jet airflow from the air outlet 10 acts more strongly on the knife edge portion 7, and the atomized paint is strongly surrounded, so that it is directed toward the object A to be painted. The application diameter is narrowed to prevent the paint from being applied in an annular shape, and when the movable base 39 is moved backward, the jet stream is diffused and weakened to some extent and acts on the knife edge portion 7, which reduces the atomization. The envelope of the paint becomes weaker and the paint is applied to the object A to be painted with a wider application diameter. Since the present invention is configured as described above, it is possible to form an annular cylindrical jet stream surrounding the atomized paint, and the atomized paint flying toward the object to be coated can be directed by the annular cylindrical jet stream. This prevents unnecessary scattering of atomized paint, making it possible to save paint, and also uniformizes the flying direction of the mist toward the object to be painted, allowing for uniform coating without uneven coating on the object. Moreover, since the air outlet is movable in the front and back direction of the cylinder, the effect of the jet stream from the air outlet on the atomized paint can be adjusted. be.

Furthermore, since the air chamber is mounted on the bearing of the rotating shaft that rotates the cylinder, it is possible to connect a high-pressure air source directly to the air chamber with a tube, etc. to supply air to the air chamber. Therefore, there is no need to form the rotating shaft hollow, and the bearing can be used as is to be equipped with an air chamber. The structure has the advantage that it can be easily formed even though the action on the air can be adjusted, and the position of the air outlet can be moved while the atomized paint is being flown, so that the jet stream from the air outlet can reduce the amount of mist. There is an advantage that the effect on the chemical paint can be precisely adjusted. With this simple structure, a jet stream is formed and the atomized paint is surrounded by the jet stream, which prevents unnecessary scattering of the atomized paint, saves paint, and reduces the amount of atomized paint. The direction of flight is made uniform towards the object to be painted, making it possible to apply uniform coating to the object without causing uneven coating, and by adjusting the position of the air outlet, the diameter of the paint applied to the object to be painted can be adjusted. It has the advantage of being able to be adjusted freely and accurately.

[Brief explanation of the drawing]

FIG. 1 is a front view of a head according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the same head, and FIG. 3 is a reduced schematic diagram of the entire apparatus, in which 1 is a rotating shaft, 3 is a bearing, 5 is a cylindrical body, 7 is a knife edge portion, 9 is an air chamber, and 10 is an air jet port.

Claims (1)

[Claims] 1. A metal cylindrical body with a knife edge portion at the front end is attached to the front end of the rotating shaft, and an air chamber is arranged around the outer periphery of the bearing of the rotating shaft so as to be movable back and forth. An air outlet opening toward the front is provided along the coaxial circumference at the rear of the outer periphery of the knife edge part, and a paint supply path supplies a thin film of paint to the inner periphery of the knife edge part, and the cylinder body and the object to be painted. An electrostatic coating device comprising: a high voltage generator that applies a high voltage between the electrostatic coating device and the high voltage generator.