JP2000084442A - Rotary-atomization coater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary-atomization coater capable of stopping the air supply to air bearings without damaging the air bearings while not working. SOLUTION: This rotary-atomizing coater is equipped with a housing 1, a rotation shaft 3 having an atomizing head 2 at its front end part, which is rotatably disposed in the housing 1, air bearings 4a and 4b supporting the rotating shaft 3, a air supplying part for bearings 5 supplying air to the air bearings 4a and 4b, and a air supplying part for a turbine 6 supplying air to give the rotating shaft 3 rotating power, and is further equipped with a stopping device 7 which stops the rotation of the rotating shaft 3 caused by inertial force under a condition wherein no air from the air supplying part for a turbine 6 is supplied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary atomizing coating apparatus.

[0002]

2. Description of the Related Art A rotary atomizing coating apparatus includes a rotary shaft supported by an air bearing and rotated by turbine air, an atomizing head attached to a tip of the rotary shaft, and a paint feed tube for supplying paint to the atomizing head. And a shaping air cap. In the air bearing, externally pressurized air is supplied to the gap between the rotating shaft and the bearing through the throttle,
Since the rotating shaft floats, it is non-contact and has excellent durability.

[0003]

Ideally, the rotating shaft floats when bearing air is supplied and rotates when turbine air is supplied. If bearing air is supplied because the unbalance of the rotating shaft is not completely zero due to restrictions, the rotor rotates even when turbine air is not supplied. Therefore, the rotating shaft always swings while the bearing air is being supplied. The number of rotations of this rotating shaft (inertial rotation) is lower than the number of rotations at the time of coating, but in some cases reaches 2000 to 3000 rpm. If the bearing air is suddenly shut off while the rotating shaft is rotating, the rotating shaft is in contact with the bearing while rotating, and there is a high possibility that the bearing is damaged. Therefore, conventionally, once the bearing air is supplied, the supply of the bearing air is continued even after the painting is completed, and the bearing is constantly raised.
Therefore, there is waste in operating energy and air consumption. An object of the present invention is to provide a rotary atomizing coating apparatus that can stop the supply of bearing air without damaging the air bearing during non-coating.

[0004]

The present invention to achieve the above object is as follows. (1) A housing, a rotary shaft rotatably provided on the housing with an atomizing head attached to the tip, an air bearing for supporting the rotary shaft, and a bearing air supply for supplying bearing air to the air bearing. And a turbine air supply unit for supplying turbine air for applying a rotational force to the rotating shaft, wherein the supply of turbine air from the turbine air supply unit is stopped. A rotary atomizing coating device comprising a stop device for stopping the inertial rotation of the rotating shaft that is inertially rotated. (2) The stopping device has a first magnetic member attached to the atomizing head or the rotating shaft, and has a polarity opposite to that of the first magnetic member, and can face the first magnetic member. A second magnetic member disposed in the housing,
The rotary atomizing coating apparatus according to claim 1, comprising:

[0005] The rotary atomizing coating apparatus of the above (1) is provided with a stop device for stopping the coasting rotation of the rotating shaft that coasts while the turbine air supply from the turbine air supply unit is stopped. At the time of painting, the inertia rotation of the rotating shaft is stopped by the stopping device, so that even if the supply of the bearing air is stopped, the air bearing is not damaged. In the rotary atomizing coating device of the above (2), the rotary shaft is attached to the atomizing head or the rotary shaft during non-coating when the rotary shaft is coasting while the supply of turbine air from the turbine air supply unit is stopped. By causing the second magnetic member having the polarity opposite to that of the first magnetic member to face the first magnetic member, the inertial rotation of the rotating shaft is stopped. Therefore, even if the supply of the bearing air is stopped, the air bearing is not damaged.

[0006]

FIG. 1 is a schematic sectional view of a rotary atomizing coating apparatus according to an embodiment of the present invention, and FIG. 2 is a schematic view of a rotary atomizing coating apparatus according to an embodiment of the present invention during operation. 3 is a schematic diagram of the rotary atomizing coating apparatus according to the embodiment of the present invention when the operation is stopped.

First, a rotary atomizing coating apparatus according to an embodiment of the present invention will be described with reference to FIGS. The rotary atomizing coating apparatus according to the embodiment of the present invention comprises a housing 1 and an atomizing head 2 at the tip.
Is mounted on the housing 1 so as to be rotatable, and air bearings 4a and 4b supporting the rotary shaft 3 are provided.
A bearing air supply unit 5 for supplying bearing air to the air bearings 4a and 4b, a turbine air supply unit 6 for supplying turbine air for applying a rotating force to the rotating shaft 3, and a supply of turbine air from the turbine air supply unit 6. Stop device 7 for stopping the coasting rotation of the rotating shaft 3 that coasts while the supply is stopped.
And

[0008] The rotary atomizing coating apparatus is further provided with a paint feed tube 8 disposed in the hollow portion of the rotating shaft 3 to supply the coating to the atomizing head 2 and sprayed toward the paint scattered from the atomizing head 2. A shaping air cap 9 for spraying shaping air for atomizing the paint and forming a flying pattern of the paint, and a high voltage generator for generating a high voltage are provided. The high voltage generated by the high voltage generator is applied to the atomizing head 2 via the air motor 11 (the part for rotating and rotating the rotating shaft 3 by the air bearings 4 a and 4 b) and the rotating shaft 3. To charge the coating particles scattered from.

The air bearing comprises a thrust bearing 4a for supporting the rotating shaft 3 in the axial direction and a radial bearing 4b for supporting the rotating shaft 3 in the radial direction. Pressurized air (bearing air) is supplied to the bearings 4a and 4b by the bearing air supply unit 5, and the rotating shaft 3 floats.

The rotating shaft 3 is provided with turbine blades 3a. The pressurized air (turbine air) supplied by the turbine air supply unit 6 is injected into the turbine blades 3a, so that the rotating shaft 3 rotates at high speed.

The stopping device 7 includes the atomizing head 2 or the rotating shaft 3.
A contact type that stops rotation of the rotating shaft 3 by contacting the
Rotating shaft 3 without contacting atomizing head 2 or rotating shaft 3
Non-contact type that stops the rotation of FIG.
FIG. 3 shows a stop device 7 of the non-contact type.
The stop device 7 has a first magnetic member 7a attached to the atomizing head 2 and a first magnetic member 7a having a polarity opposite to that of the first magnetic member 7a.
And a second magnetic member 7b disposed in the housing 1 so as to be able to face the magnetic member 7a. First magnetic member 7
The magnetic force of the first magnetic member a and the second magnetic member 7b is set to such an extent that the rotary shaft 3 is stopped in a floating state. The first magnetic member 7a may be attached to the rotating shaft 3. The first magnetic member 7a and the second magnetic member 7b are respectively arranged at equal intervals in the circumferential direction in order to balance the rotary atomizing coating device. The second magnetic member 7b is attached to a first rod 7c extending in the axial direction. The first rod 7c is axially extended through an intermediate member 7d.
Is linked to The second rod 7e is a hollow tubular member 7
f. The hollow tubular member 7f is divided into a front chamber F and a rear chamber B by an axially movable partition wall 7g attached to the second rod 7e. An air supply / exhaust pipe 7h communicates with the front chamber F. The timing at which air is supplied / stopped to the front side chamber F is the same as the time at which turbine air is supplied / stopped from the turbine air supply unit 6. A spring member 7i for urging the partition 7g is disposed in the rear chamber B.

As another embodiment of the present invention, the stopping device 7 may be of a contact type. When the rotary atomizing coating device is not operating, the contact type stop device is directly contacted with the atomizing head or the rotary shaft with a force that supports the rotary shaft in a floating state (a force less than the maximum load capacity), and the rotary atomization is performed. It consists of a member that is not in contact with the atomizing head and the rotating shaft during operation of the coating device, for example, a sponge-like member.

Next, the operation of the rotary atomizing coating apparatus according to the embodiment of the present invention will be described. At the time of coating (during operation of the rotary atomizing coating apparatus), bearing air is supplied from the bearing air supply unit 5,
The rotating shaft 3 floats, turbine air is supplied from the turbine air supply unit 6, and the rotating shaft 3 rotates at high speed. The atomizing head 2 is also rotating with the rotation of the rotating shaft 3. The paint is supplied to the atomizing head 2 by a paint feed tube 8,
Shaping air is blown from the rear, whereby the paint is atomized and discharged from the front end of the atomization head. At the same time, a charge is applied to the paint. While turbine air is being supplied from the turbine air supply unit 6, pressurized air is supplied to the front chamber F via the air supply / exhaust pipe 7h of the stop device 7. Therefore, as shown in FIG.
Air is filled, and the spring member 7i is deformed by the partition wall 7g. Since the partition wall 7g is attached to the second rod 7e, the second rod 7e and the second rod 7e
The first rod 7c connected to e is retracted.
Therefore, the second magnetic member 7b attached to the first rod 7c does not face the first magnetic member 7a. Therefore, the rotating shaft 3 is connected to the first magnetic member 7a and the second magnetic member 7a.
Rotate without being influenced by the magnetic force of the magnetic member 7b.

During non-coating (when the operation of the rotary atomizing coating apparatus is stopped), the supply of turbine air from the turbine air supply unit 6 is first stopped. At the same time, air supply / exhaust pipe 7h
No pressurized air is supplied to the front side chamber F via. Therefore, the spring member 7i urges the partition wall 7g. Thereby, the partition wall 7g moves forward, the second rod 7e attached to the partition wall 7g, and the first rod 7c attached to the second rod 7e advance, and are attached to the first rod 7c. The second magnetic member 7b is opposed to the first magnetic member 7a. Normally, even if the supply of turbine air is stopped, if the bearing air is supplied, the rotating shaft 3 continues to rotate (coasting rotation) because the shaft is unbalanced. However, in the embodiment of the present invention, when the supply of the turbine air is stopped, the first magnetic member 7a attached to the rotating shaft 3 and the first magnetic member 7a have the opposite polarity. Since the two magnetic members 7b are opposed to each other, the inertial rotation of the rotating shaft 3 is stopped in a state where the rotating shaft 3 floats by the bearing air due to the magnetic force of the first magnetic member 7a and the second magnetic member 7b. Thereafter, when the supply of the bearing air from the bearing air supply unit 5 is stopped, the rotating shaft 3 comes into contact with the air bearings 4a and 4b. Since the rotating shaft 3 comes into contact with the air bearings 4a and 4b while the rotation is stopped, the air bearings 4a and 4b are not damaged. Therefore, in order to prevent the air bearings 4a and 4b from being damaged, the bearing air is not always supplied even when the rotary atomizing coating apparatus is stopped, so that the bearing air is wasted and energy is wasted. Never be used for

[0015]

According to the first aspect of the present invention, there is provided a rotary atomizing coating apparatus comprising a stopping device for stopping the inertial rotation of the rotating shaft which is coasted while the supply of turbine air from the turbine air supply unit is stopped. Since the coasting rotation of the rotating shaft can be stopped by the stop device at the time of painting, even if the supply of bearing air is stopped, the rotating shaft comes into contact with the air bearing with the coasting rotation of the rotating shaft stopped. The bearing is not damaged. In the rotary atomizing coating apparatus according to the second aspect, when the rotation shaft is coasting while the supply of the turbine air from the turbine air supply unit is stopped, the atomization head or the second nozzle attached to the rotation shaft. The first magnetic member has the first
The inertia rotation of the rotating shaft is stopped by making the second magnetic member having the opposite polarity magnetism face the second magnetic member.
Therefore, even if the supply of the bearing air is stopped, the air bearing is not damaged.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a rotary atomizing coating apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic view of the rotary atomizing coating apparatus according to the embodiment of the present invention during operation.

FIG. 3 is a schematic view when the operation of the rotary atomizing coating apparatus according to the embodiment of the present invention is stopped.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 2 Atomization head 3 Rotating shaft 4a, 4b Air bearing 5 Bearing air supply part 6 Turbine air supply part 7 Stop device

Claims (2)

[Claims] 1. A housing, a rotating shaft rotatably provided on the housing with an atomizing head attached to a tip, an air bearing for supporting the rotating shaft, and a bearing for supplying bearing air to the air bearing. A rotary atomizing coating apparatus having an air supply unit and a turbine air supply unit that supplies turbine air that applies a rotational force to the rotating shaft, wherein supply of turbine air from the turbine air supply unit is stopped. A rotary atomizing coating device comprising a stop device for stopping the inertial rotation of the rotating shaft that is inertially rotated in a state where the rotating shaft is in an idle state. A first magnetic member attached to the atomizing head or the rotating shaft; and a first magnetic member having a polarity opposite to that of the first magnetic member. The rotary atomization coating apparatus according to claim 1, further comprising: a second magnetic member arranged on the housing so as to be able to face each other.