JP2002166199A - Rotary atomizing head type coating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the falling and scattering of a rotary atomizing head from a rotary shaft to enhance reliability. SOLUTION: A loosening preventing means 9 is provided to the attaching shaft part 2 of a rotary shaft 1 and the attaching cylindrical part 7 of the rotary atomizing head 4. The loosening preventing means 9 is constituted of the male screw part 10 formed at the leading end of the attaching shaft part 2, the female screw part 11 formed at the deep part of the attaching shaft part 2 and the O-rings 14 and 15 fitted in the ring fitting grooves 12 and 13 formed on the outer periphery of the attaching shaft part 2. When the rotary atomizing head 4 is threaded with the rotary shaft 1, the O-rings 14 and 15 are held between the attaching shaft part 2 and the attaching cylindrical part 7 while deformed elastically and the rotation in the loosening direction of the rotary atomizing head 4 can be prevented by the friction force thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary atomizing head type coating apparatus suitable for coating an object such as an automobile body.

[0002]

2. Description of the Related Art In general, a rotary atomizing head type coating apparatus is widely known as a coating apparatus for coating an object such as an automobile body. Therefore, such a conventional rotary atomizing head type coating apparatus will be described with reference to FIGS.

A rotary atomizing head type coating apparatus 100 has a cylindrical cover 10.
1, an air motor 102 provided as a rotation source provided in the cover 101, and an air bearing 10 of the air motor 102.
The rotary shaft 104 is inserted in the axial direction while being supported by the shaft 3, and rotated by the air motor 102.
And the rotary shaft 104 located on the front side of the cover 101.
And a rotary atomizing head 10 for spraying paint by rotating at a high speed of, for example, 3000 to 100000 rpm.
5, and is roughly constituted.

Here, the tip side of the rotary shaft 104 projects from the air motor 102 to form a mounting shaft portion 104A, and the rear side of the rotary atomizing head 105 has a cylindrical mounting tube portion 105A into which the mounting shaft portion 104A is inserted. And the rotating shaft 104
Mounting shaft part 104A and mounting cylinder part 10 of rotary atomizing head 105
5A is fixed by a screw portion 106.

[0005] A feed tube 107 is provided in the rotary shaft 104 so as to pass therethrough.
The tip side of 07 protrudes from the rotating shaft 104 and extends into the rotary atomizing head 105. And feed tube 1
In 07, a paint passage and a thinner passage are provided.

[0006] Further, a cylindrical shaping air ring 108 is provided on the tip side of the cover 101 around the rotary atomizing head 105.
08 is formed with a large number of air ejection ports 108A for ejecting air for controlling the spray pattern of the sprayed paint.

[0007] The rotary atomizing head type coating apparatus 100 configured as described above is rotated by a rotary atomizing head 10 by an air motor 102.
5 is rotated at a high speed.
The paint is supplied to the rotary atomizing head 105 through the above. Thus, the rotary atomizing head type coating apparatus 100 is capable of rotating the rotary atomizing head 10.
The paint is atomized and sprayed by the centrifugal force when the 5 rotates, and the shaping air is supplied through the shaping air ring 108 to apply the paint particles to the object while controlling the spray pattern.

[0008]

In the above-described rotary atomizing head type coating apparatus 100 according to the prior art, the rotating shaft 1
04 and the rotary atomizing head 105 are fixed by a screw portion 106. Then, when the rotation shaft 104 rotates in a counterclockwise direction (counterclockwise as viewed from the front of the rotary atomizing head 105) as indicated by an arrow a in FIG. A screw portion 106 is formed in a direction opposite to the rotation direction of the rotation shaft 104. For this reason, when the rotation of the air motor 102 rises, the rotation atomizing head 10
5, the rotating shaft 104 acts to retighten,
When the rotation falls, the rotating shaft 104 acts on the rotating atomizing head 105 so as to relax.

If a problem occurs in the driving section of the air motor 102 during the high-speed rotation of the air motor 102, the rotation speed of the air motor 102 may be suddenly reduced or the rotation of the air motor 102 may be suddenly stopped. Also, with the change in the amount of paint to be supplied to the rotary atomizing head 105 and the cleaning of the rotary atomizing head 105 by color change, the number of revolutions of the air motor 102 may be rapidly reduced from, for example, 30,000 rpm to about 10,000 rpm. is there.

In such a case, while the rotation speed of the rotating shaft 104 decreases, the rotary atomizing head 105 tries to maintain the current rotation speed by the action of its inertia. May act, and the rotary atomizing head 105 may become loose with respect to the rotary shaft 104. For this reason, if the rotation speed of the air motor 102 is rapidly reduced during the high-speed rotation of the air motor 102, there is a problem that the rotary atomizing head 105 is likely to loosen from the rotary shaft 104 and fall off.

Further, a large centrifugal force acts on the rotary atomizing head 105 during high-speed rotation, and the mounting cylinder portion 105A of the rotary atomizing head 105 expands in the radial direction. Of the screw portion 106 tends to decrease. Therefore, when the rotation speed of the rotating shaft 104 is greatly reduced or the rotation is suddenly stopped, the screw portion 106 is easily loosened, and the rotary atomizing head 105 may easily fall off from the rotating shaft 104. is there.

When the rotary atomizing head 105 during high-speed rotation falls off the rotary shaft 104, the rotary atomizing head 105
Is scattered, peripheral equipment of the rotary atomizing head type coating apparatus 100,
There is a problem that not only the rotary atomizing head 105 itself is damaged by colliding with the object to be coated, but also peripheral devices, the object to be coated and the like are damaged.

On the other hand, as another conventional rotary atomizing head type coating apparatus, an O-ring is mounted on a mounting shaft of a rotary shaft or a mounting cylinder of a rotary atomizing head, and the rotary atomizing head is resiliently applied by the O-ring. Is known to be attached to a rotating shaft (for example, Japanese Patent Application Laid-Open No. 11-28391).

However, in other conventional techniques, the O-ring may be damaged because the surface of the O-ring is rubbed when the rotary atomizing head is detached from the rotary shaft. When the damaged O-ring is used as it is, the force for fixing the rotary atomizing head to the rotary shaft is weakened, and the rotary atomizing head may fall off the rotary shaft during high-speed rotation.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to prevent a rotary atomizing head from falling off and scattering from a rotary shaft, thereby improving reliability. And a rotary atomizing head type coating apparatus.

[0016]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a rotating source that rotates at a high speed, a base end in the axial direction rotatably supported by the rotating source, and a tip end near the rotating source. A rotating shaft protruding from the mounting shaft portion, a front portion side serving as a paint atomizing portion for atomizing the supplied paint, and a rear side portion screwed to the mounting shaft portion of the rotating shaft and attached to a mounting cylinder portion. The present invention is applied to a rotary atomizing head type coating apparatus comprising a rotary atomizing head.

The first aspect of the invention is characterized in that the rotary atomizing head is prevented from loosening when the rotary atomizing head is attached to the rotary shaft and the rotary atomizing head. A male screw portion provided on the outer periphery of the mounting shaft portion and having a thread groove formed on the outer periphery,
A female screw portion provided on an inner periphery of the mounting cylinder portion and having a thread groove screwed in a direction to be tightened with respect to the male screw portion when the rotation shaft rotates, and rotating with the mounting shaft portion of the rotation shaft. A ring-shaped elastic member provided between the atomizing head and the mounting cylinder portion, the elastic member being configured to provide resistance to rotation of the rotary atomizing head in the loosening direction by frictional force of the elastic member. It is in.

With this configuration, when the male screw portion of the rotary shaft is screwed into the female screw portion of the rotary atomizing head, the male screw portion and the female screw portion are tightened when the rotary shaft rotates. A thread groove is formed in each direction. Therefore, when the rotating shaft is rotated, the rotary atomizing head can be tightened.

The elastic ring is sandwiched between the mounting shaft of the rotary shaft and the mounting cylinder of the rotary atomizing head, and applies a frictional force to the mounting shaft and the mounting cylinder. Therefore, for example, even when the rotating shaft is suddenly stopped, the frictional force of the elastic ring can provide resistance to the rotation of the rotary atomizing head in the loosening direction. Can be prevented.

According to a second aspect of the present invention, the elastic ring is mounted between the outer circumference of the mounting shaft of the rotary shaft and the inner circumference of the mounting cylinder of the rotary atomizing head.

Thus, the elastic ring is sandwiched between the mounting shaft of the rotary shaft and the mounting cylinder of the rotary atomizing head and is elastically deformed, so that the outer peripheral surface of the mounting shaft and the inner surface of the mounting cylinder are formed. A frictional force is applied to the peripheral surface over the entire circumference. As a result, resistance can be given to the rotation of the rotary atomizing head in the loosening direction by the elastic ring, and the loosening of the rotary atomizing head can be prevented.

According to a third aspect of the present invention, a ring fitting groove is provided on one of the mounting shaft portion of the rotating shaft and the mounting cylinder portion of the rotary atomizing head, and the elastic ring is fitted in the ring fitting groove. Is to be worn.

Thus, the elastic ring can be fitted in the ring fitting groove, and the elastic ring can be attached to one of the mounting shaft of the rotary shaft and the mounting cylinder of the rotary atomizing head. Then, by screwing the rotary atomizing head to the rotating shaft, the elastic ring can be sandwiched while being elastically deformed between the mounting shaft portion and the mounting cylindrical portion, and the rotary atomizing head is loosened and stopped. be able to.

According to a fourth aspect of the present invention, a plurality of ring-fitting grooves are provided on one of the mounting shaft portion of the rotary shaft and the mounting cylinder portion of the rotary atomizing head so as to be spaced apart in the axial direction of the rotary shaft. And the elastic ring is configured to be fitted in each ring fitting groove.

Thus, the rotation atomizing head can be loosened by the plurality of elastic rings, and the reliability can be improved.

According to a fifth aspect of the present invention, an elastic ring is elastically engaged with one of the mounting shaft of the rotary shaft and the mounting cylinder of the rotary atomizing head at a position opposed to the ring fitting groove. That is, a matching ring engaging groove is provided.

Thus, the elastic ring is elastically engaged with the ring engaging groove, so that the elastic ring generates a frictional force in the rotational direction of the rotary atomizing head and also generates a frictional force in the axial direction. it can. For this reason, the rotary atomizing head can be stopped and prevented from coming off.

According to a sixth aspect of the present invention, there is provided a rotary atomizing head, wherein an annular partition is provided on the inner side of the mounting cylinder to separate the paint atomizing portion and the mounting cylinder, and the elastic ring is provided with the rotary atomizer. It is configured to be mounted between the annular partition wall of the head and the end surface of the mounting shaft portion of the rotating shaft.

Thus, when the rotary atomizing head is screwed onto the rotary shaft, the distal end surface of the mounting shaft portion advances toward the inner side of the mounting cylinder portion, and both approach. And the elastic ring
It is sandwiched while being elastically deformed between the distal end surface of the mounting shaft portion and the annular partition wall on the back side of the mounting cylinder portion. As a result, the elastic ring generates a frictional force in the rotational direction with respect to the rotary atomizing head,
The rotation atomizing head can be stopped.

According to a seventh aspect of the present invention, the mounting shaft of the rotary shaft is provided with a step facing the rear end face of the mounting cylinder of the rotary atomizing head.
The elastic ring is mounted between the step of the rotary shaft and the rear end face of the mounting cylinder of the rotary atomizing head.

Thus, when the rotary atomizing head is screwed onto the rotary shaft, the end surface of the mounting cylinder portion advances toward the step of the mounting shaft portion. Since the elastic ring is elastically deformed and held between the end face of the mounting cylinder and the step of the mounting shaft, the elastic ring generates a frictional force in a rotational direction with respect to the rotary atomizing head, and Atomizing head can be stopped and stopped.

According to an eighth aspect of the present invention, the mounting shaft portion of the rotary shaft is formed as a tapered shaft portion having a tapered shaft having a small diameter toward the front end side, and the mounting cylindrical portion of the rotary atomizing head is formed on the rear end side. And a tapered cylindrical portion having a tapered hole into which the tapered shaft portion is inserted, the diameter of which becomes smaller toward the inner side.

Thus, when the female screw portion of the rotary atomizing head is screwed to the male screw portion of the rotary shaft, the tapered shaft portion of the rotary shaft abuts against the tapered cylindrical portion of the rotary atomizing head to perform rotary atomization. The center of the axis of the head and the axis of the rotation axis can be matched. When an elastic ring is attached between the outer peripheral surface of the tapered shaft portion and the inner peripheral surface of the tapered cylindrical portion that abut against each other, the elastic ring is formed between the tapered shaft portion and the tapered cylindrical portion. The ring can be largely elastically deformed. Therefore, the frictional force of the elastic ring can be increased, and the loosening of the rotary atomizing head can be reliably prevented.

[0034]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a rotary atomizing head type coating apparatus according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

First, FIGS. 1 and 2 show a first embodiment of the present invention. In the drawings, reference numeral 1 denotes a rotating shaft which rotates at a high speed by an air motor as a rotating source.
An air turbine (not shown) is fixed to the base end side of the hollow. Then, by supplying drive air to the air turbine and rotating the air turbine, the rotating shaft 1 rotates at a high speed of, for example, 3000 to 100000 rpm.

Reference numeral 2 denotes a mounting shaft portion provided on the distal end side of the rotary shaft 1. The mounting shaft portion 2 has a tapered shape formed of a tapered shaft having a smaller diameter from the base end side of the rotary shaft 1 toward the distal end side. Shaft 2A
It is formed as. A male screw portion 10 described later is provided on the tip end side of the tapered shaft portion 2A, and a rotary atomizing head 4 described later is attached to the mounting shaft portion 2 by the male screw portion 10.

Reference numeral 3 denotes a feed tube provided to pass through the rotary shaft 1, and the distal end side of the feed tube 3 protrudes from the mounting shaft portion 2 of the rotary shaft 1 and extends into the rotary atomizing head 4. ing. In the feed tube 3, a paint passage 3A and a thinner passage 3B are provided. Thus, the feed tube 3 supplies the rotary atomizing head 4 with paint, thinner as a cleaning fluid, and the like.

Reference numeral 4 denotes a rotary atomizing head attached to the tip end of the rotary shaft 1. The rotary atomizing head 4 includes an atomizing head main body 5 and a hub member 8, which will be described later.

Numeral 5 denotes a bell-shaped atomizing head body which forms the outer shape of the rotary atomizing head 4 and expands from the rear side toward the front side. The atomizing head body 5 is made of, for example, an aluminum alloy. , A stainless steel alloy, a hard resin material, or the like. Here, when the atomization head main body 5 is formed of a resin material, a conductive resin material having conductivity or a non-conductive resin material having a surface coated with a conductive paint is used. . Thereby, when performing electrostatic painting,
A high voltage can be applied to the entire rotary atomizing head 4 including the hub member 8, and the paint flowing on these surfaces can be directly charged to a high voltage. And the atomizing head body 5
Is constituted by a paint atomizing section 6 located on the front side and a mounting cylinder section 7 located on the rear side.

Numeral 6 denotes a paint atomizing section which is located at the front side of the atomizing head main body 5 and atomizes the supplied paint.
Is located on the front side of the atomization head main body 5 and is continuous with the paint thinning surface 6A which expands in a disk shape and the front end (outer peripheral end) of the atomization head main body 5 which is continuous with the paint thinning surface 6A. And the discharge edge 6B.

Then, while the rotary atomizing head 4 is rotating at a high speed, the paint is supplied to the paint thinning surface 6A of the atomizing head main body 5. Thus, the paint supplied to the paint thinning surface 6A is sprayed as paint particles from the discharge edge 6B.

Reference numeral 7 denotes a cylindrical mounting cylinder having a bottom provided on the rear side of the atomizing head main body 5. The mounting cylinder 7 has a tapered hole whose diameter decreases from the opening side to the back side. 7A. Further, an annular partition wall 7B is formed in the inner part of the mounting cylinder 7 so as to protrude radially inward to separate the mounting cylinder 7 from the paint thinning surface 6A.
The distal end of the feed tube 3 protruding from the distal end of the rotary shaft 1 is inserted into the inner peripheral side of the annular partition 7B.

Further, a female screw portion 11 to be described later is provided on the back side of the tapered cylindrical portion 7A. When the atomizing head main body 5 is screwed onto the rotary shaft 1, the tapered shaft portion 2A of the rotary shaft 1 abuts against the tapered cylindrical portion 7A of the atomizing head main body 5, and the atomizing head main body 5 is fixed to the shaft. It is fixed to the rotating shaft 1 with the centers aligned.

Reference numeral 8 denotes a disk-shaped hub member provided on the side of the paint thinning surface 6A of the atomizing head main body 5, and a paint and a solvent are coated on the outer peripheral side of the hub member 8 with the paint thin film of the atomizing head main body 5. Are provided at the central portion, and a plurality of second hub holes 8B, 8B,... For supplying a solvent to the front surface of the hub member 8 are provided at the center. Have been.

Reference numeral 9 denotes a loosening preventing means for preventing the rotary atomizing head 4 from being loosened with the rotary atomizing head 4 attached to the rotary shaft 1. It is provided on the mounting cylinder 7 of the rotary atomizing head 4, and includes a male thread 10, a female thread 11, elastic rings 14 and 15, and the like.

Reference numeral 10 denotes a male screw portion provided on the mounting shaft portion 2 of the rotating shaft 1. The male screw portion 10 is disposed on the tip side of the tapered shaft portion 2A, and is formed on the outer periphery of the mounting shaft portion 2. It is constituted by a groove 10A.

Numeral 11 denotes a female thread provided on the mounting cylinder 7 of the rotary atomizing head 4, and the female thread 11 is a tapered cylinder 7A.
The female thread 11 is screwed into the male thread 10. The thread 11 </ b> A is formed on the inner side of the mounting cylinder 7.

As described in the prior art, the male screw portion 10 and the female screw portion 11 are provided with a right-hand thread when the rotary shaft 1 rotates counterclockwise (counterclockwise) when viewed from the front of the rotary atomizing head 4. The thread grooves 10A and 11A are formed in a direction which is opposite to the rotating direction of the rotating shaft 1. As a result, when the rotation of the air motor increases, the male screw portion 10 and the female screw portion 11 move relative to the rotary atomizing head 4 with respect to the rotary shaft 1.
Acts to retighten, and acts so that the rotating shaft 1 relaxes with respect to the rotary atomizing head 4 when the rotation is lowered.

Reference numerals 12 and 13 denote, for example, two ring fitting grooves provided on the mounting shaft portion 2 of the rotary shaft 1.
Reference numerals 2 and 13 are located on the outer peripheral surface of the mounting shaft 2 and are recessed in the tapered shaft 2A. Then, the ring fitting groove 12,
13 are arranged axially apart from each other, and are annularly recessed so as to open radially outward. Further, the ring fitting groove 12 located on the tip end side of the tapered shaft portion 2A is
The groove diameter is smaller than the ring fitting groove 13 located on the base end side. Then, the ring fitting grooves 12, 1
O-rings 14 and 15 to be described later are fitted to 3 respectively.

Reference numerals 14 and 15 denote O-rings as elastic rings fitted in the ring-fitting grooves 12 and 13. The O-rings 14 and 15 are rings having a circular cross section made of an elastic material such as a rubber material. Is formed. The outer dimension of the O-ring 14 is set to a value smaller than the outer dimension of the O-ring 15, and the outer diameter of the O-rings 14, 15 is one of those in a state where the O-rings 14, 15 are fitted in the ring fitting grooves 12, 13. The portion is set to a value protruding outside from the ring fitting grooves 12 and 13.

Here, when the mounting cylinder 7 of the atomizing head main body 5 is screwed to the mounting shaft 2 of the rotating shaft 1 in a state of being fitted in the ring fitting grooves 12 and 13, the O-ring 14, 15 is
It is in contact with the inner peripheral surface of the tapered cylindrical portion 7A of the atomizing head main body 5, and is sandwiched between the tapered shaft portion 2A and the tapered cylindrical portion 7A in an elastically deformed state. Thereby, the O-rings 14, 15
Generates a rotational frictional force on the tapered cylindrical portion 7A, and the frictional force gives resistance to the rotation of the rotary atomizing head 4 in the loosening direction.

The rotary atomizing head type coating apparatus according to the present embodiment has the above-described configuration, and its operation will be described below.

First, when coating an object such as a car body, by rotating an air motor, the rotary atomizing head 4 rotates at a high speed of about 30,000 rpm together with the rotary shaft 1. Then, the paint is supplied from the tip of the feed tube 3 toward the rotary atomizing head 4 while the rotary atomizing head 4 is rotationally driven together with the rotary shaft 1. At this time, the paint supplied to the rotary atomizing head 4 flows out from the first hub hole 8A of the hub member 8 to the paint thinning surface 6A of the atomizing head main body 5 by centrifugal force. Thereby, the paint thinning surface 6
The paint supplied to A is sprayed as paint particles from the discharge edge 6B, and is applied to an object to be coated.

On the other hand, when performing color change, a solvent such as thinner is supplied to the rotary atomizing head 4 in place of the paint in a state where the number of rotations of the rotary shaft 1 is reduced from, for example, about 30,000 rpm to about 10,000 rpm. As a result, the paint that has adhered to the paint thinning surface 6A and the discharge edge 6B of the atomizing head main body 5 is washed with the solvent that has flowed out of the first hub hole 8A of the hub member 8, and the solvent is removed from the second hub hole 8B. The front surface of the hub member 8 is washed with the solvent that has flowed out.

However, with the change in the amount of paint to be supplied to the rotary atomizing head 4 and the cleaning of the rotary atomizing head 4 by changing colors, the number of revolutions of the rotary shaft 1 is increased from, for example, 30000 rpm to 1
It may drop rapidly to 0000 rpm. Also,
If a trouble occurs in the driving section of the air motor during the high-speed rotation of the air motor, the rotation speed of the air motor (rotating shaft 1) may suddenly decrease or the rotation may stop suddenly.

In such a case, while the rotation speed of the rotary shaft 1 decreases, the rotary atomizing head 4 attempts to maintain the current rotation speed by the action of its inertia. A force for rotating the rotary atomizing head 4 in a direction in which the rotary atomizing head 4 is loosened acts between the rotary atomizing head 4 and the female screw portion 11 of the rotary atomizing head 4. At this time, O-rings 14 and 15 are provided between the mounting shaft 2 of the rotary shaft 1 and the mounting cylinder 7 of the rotary atomizing head 4.
Is provided, the O-rings 14 and 15 abut against the inner peripheral surface of the mounting cylinder portion 7 while being elastically deformed, and apply a frictional force between the rotary shaft 1 and the rotary atomizing head 4 in the rotational direction. are doing. For this reason, the frictional force of the O-rings 14 and 15 gives resistance to the rotation of the rotary atomizing head 4 in the loosening direction, and can stop and loosen the rotary atomizing head 4. Dropout can be prevented.

Since the O-rings 14 and 15 are mounted between the outer circumference of the mounting shaft 2 of the rotary shaft 1 and the inner circumference of the mounting cylinder 7 of the rotary atomizing head 4, the O-rings 14 and 15 are mounted on the mounting shaft. A frictional force is applied to the outer peripheral surface of the portion 2 and the inner peripheral surface of the mounting cylinder portion 7 over the entire circumference. Therefore, the resistance of the O-rings 14 and 15 in the rotation direction can be increased, and the loosening of the rotary atomizing head 4 can be prevented.

Further, a large centrifugal force acts on the rotary atomizing head 4 during high-speed rotation, so that the mounting cylinder 7 of the rotary atomizing head 4 expands in the radial direction, and the rotary atomizing head 4 and the rotating shaft 1 are connected to each other. Tends to decrease the fastening force.

However, in this embodiment, the O-ring 1
4 and 15 are sandwiched between the mounting shaft portion 2 of the rotating shaft 1 and the mounting cylinder portion 7 of the rotary atomizing head 4 while being elastically deformed. 1
The diameters of the pipes 4 and 15 also increase due to the centrifugal force, and their cross-sectional shapes are restored to a state before being sandwiched between the mounting shaft 2 and the mounting cylinder 7. Therefore, the O-rings 14, 15
Can maintain a state in which the mounting shaft portion 2 and the mounting cylinder portion 7 are in contact with each other while being elastically deformed, and can continuously apply a frictional force to the rotary shaft 1 and the rotary atomizing head 4. As a result, even when the rotary atomizing head 4 rotates at a high speed, the rotary atomizing head 4 can be prevented from loosening and falling off, and the reliability can be improved.

The O-rings 14 and 15 provided between the rotary shaft 1 and the rotary atomizing head 4 only have the function of preventing the rotary atomizing head 4 from loosening and falling off. The rotary atomizing head 4 is fastened by a fastening force between the male screw portion 10 of the rotary shaft 1 and the female screw portion 11 of the rotary atomizing head 4. For this reason, even if the surfaces of the O-rings 14 and 15 are slightly damaged when the rotary atomizing head 4 is attached to and detached from the rotary shaft 1, the male screw portion 10 of the rotary shaft 1 and the rotary atomizing head 4 are not damaged. Does not affect the fastening force itself with the female screw portion 11.

Therefore, the O-rings 14 and 15 are damaged as compared with the case where the rotary atomizing head 4 is fitted to the rotary shaft 1 by using the elastic force of the O-ring as in other conventional techniques. Even at this time, the fastening force for fixing the rotary atomizing head 4 to the rotary shaft 1 can be secured, and the reliability can be improved.

On the other hand, when removing the rotary atomizing head 4 from the rotating shaft 1 to clean the rotary atomizing head 4, the O-ring 1
Rotating atomizing head to the extent that it resists the frictional force of 4, 15
, The rotary atomizing head 4 can be easily removed from the rotary shaft 1. Therefore, even when the O-rings 14 and 15 are not provided, the rotary atomizing head 4 can be attached and detached without impairing the workability at all.

The mounting shaft portion 2 of the rotary shaft 1 is provided with two ring fitting grooves 12 and 13 spaced apart in the axial direction, and O-rings 14 and 15 are provided in the ring fitting grooves 12 and 13 respectively. After the fitting, the rotary atomizing head 4 can be loosened by the two O-rings 14 and 15, and the reliability can be improved.

Further, the ring fitting grooves 12, 13 are provided in the tapered shaft portion 2A, and the O-rings 14, 15 are fitted in the ring fitting grooves 12, 13; When the female screw portion 11 of the atomizing head 4 is screwed, the tapered shaft portion 2A of the rotary shaft 1 abuts against the tapered cylindrical portion 7A of the rotary atomizing head 4 to connect the rotary atomizing head 4 to the rotary shaft 1. The axis centers can be matched.

Further, when the female screw portion 11 of the rotary atomizing head 4 is screwed to the male screw portion 10 of the rotary shaft 1, O-rings 14, 15 are provided between the tapered shaft portion 2A and the tapered cylindrical portion 7A.
Can be sandwiched while being elastically deformed. Therefore, a large frictional force in the rotational direction can be applied between the rotating shaft 1 and the rotary atomizing head 4 by the O-rings 14 and 15, and the rotation of the rotary atomizing head 4 can be stopped.

FIGS. 3 and 4 show a second embodiment of the present invention. The feature of this embodiment is that a ring fitting groove is provided in a mounting cylinder portion of a rotary atomizing head. An O-ring is provided in the fitting groove so as to elastically contact the mounting shaft of the rotating shaft.

In the figure, reference numeral 21 denotes a rotating shaft of an air motor, which is formed in a hollow like the rotating shaft 1 according to the first embodiment and rotates at high speed.

Reference numeral 22 denotes a mounting shaft portion provided on the distal end side of the rotating shaft 21 according to the present embodiment. The mounting shaft portion 22 has a tapered shape having a diameter decreasing from the base end side of the rotating shaft 21 toward the distal end side. It is formed by the shaft portion 22A.

Reference numeral 23 denotes a feed tube provided so as to be inserted into the rotary shaft 21. The distal end of the feed tube 23 projects from the distal end of the mounting shaft 22, and extends into a rotary atomizing head 24 described later. are doing.

Reference numeral 24 denotes a rotary atomizing head attached to the tip end of the rotary shaft 21. The rotary atomizing head 24 is constituted by an atomizing head main body 25 and a hub member 28 described later.

Reference numeral 25 denotes a bell-shaped atomizing head main body.
The atomizing head main body 25 includes a paint atomizing portion 26 located on the front side and a mounting cylinder portion 27 located on the rear side, similarly to the atomizing head body 5 according to the first embodiment. The oxidized portion 26 is constituted by a paint thinning surface 26A and a discharge edge 26B.

Reference numeral 27 denotes a mounting tube portion provided on the rear side of the atomizing head main body 25 according to the present embodiment.
It is formed as a tapered cylindrical portion 27A having a tapered hole having a smaller diameter from the rear end side (opening side) toward the back side.
Further, an annular partition wall 27B is formed in the inner part of the mounting cylinder 27.

Reference numeral 28 denotes a paint thinning surface 26 of the atomizing head main body 25.
A disk-shaped hub member provided on the A side,
In the same manner as the hub member 8 according to the first embodiment,
And a second hub hole 28B.

Reference numeral 29 denotes a slack preventing means according to the present embodiment.
And the mounting cylinder portion 27 of the rotary atomizing head 24, and is constituted by a male screw portion 30, a female screw portion 31, O-rings 34 and 35, and the like.

Reference numeral 30 denotes a male screw portion provided on the mounting shaft portion 22 of the rotating shaft 21. The male screw portion 30 has a tapered shaft portion 22.
A is provided on the distal end side of A and is formed by a thread groove 30 </ b> A formed on the outer periphery of the mounting shaft portion 22.

Reference numeral 31 denotes a female screw portion provided on the mounting cylinder portion 27 of the rotary atomizing head 24. The female screw portion 31 is disposed on the inner side of the tapered cylindrical portion 27A. It is constituted by the formed screw groove 31A.

Reference numerals 32 and 33 denote mounting cylinders 2 of the rotary atomizing head 24.
7, the ring fitting grooves 32,
33 is located on the inner peripheral surface of the mounting cylinder 27 and is recessed in the tapered cylinder 27A. Then, the ring fitting groove 32,
The reference numerals 33 are axially separated from each other, and are annularly concave so as to open radially inward.

Reference numerals 34 and 35 denote O-rings as elastic rings fitted in the ring-fitting grooves 32 and 33. The O-rings 34 and 35 are formed as rings having a circular cross section by an elastic body such as a rubber material. Have been. When the rotary atomizing head 24 is screwed onto the rotary shaft 21, the O-rings 34, 3
Reference numeral 5 elastically contacts the outer peripheral surface of the tapered shaft portion 22A of the rotating shaft 21.

Thus, also in the present embodiment having such a configuration, it is possible to obtain substantially the same operation and effect as in the first embodiment.

Next, FIGS. 5 and 6 show a third embodiment of the present invention. The feature of this embodiment is that a mounting shaft of a rotary atomizing head is provided on a mounting shaft of a rotary shaft. A step portion facing the end face is provided, a first O-ring is provided between the step portion and an end face of the mounting tube portion of the rotary atomizing head, and an annular partition of the mounting tube portion of the rotary atomizing head and a rotating shaft are provided. A second O-ring is provided between the end surface of the mounting shaft and the second O-ring.

In the figure, reference numeral 41 denotes a rotating shaft of the air motor. The rotating shaft 41 is formed in a hollow like the rotating shaft 1 according to the first embodiment, and rotates at a high speed.

Reference numeral 42 denotes a mounting shaft portion provided on the distal end side of the rotating shaft 41 according to the present embodiment. The mounting shaft portion 42 has a tapered shape having a diameter decreasing from the base end side of the rotating shaft 41 toward the distal end side. It is formed as a shaft portion 42A.

The mounting shaft 42 has a tapered shaft 4
A step 42B having a large diameter is formed at the base end side of 2A. The step portion 42B faces the rear end surface 47C of the rotary atomizing head 44, and the front end surface 42C of the mounting shaft portion 42 faces the annular partition 47B of the rotary atomizing head 44.

Reference numeral 43 denotes a feed tube provided so as to pass through the inside of the rotary shaft 41. The distal end of the feed tube 43 projects from the distal end of the mounting shaft portion 42 and extends into a rotary atomizing head 44 described later. are doing.

Reference numeral 44 denotes a rotary atomizing head attached to the tip end of the rotary shaft 41. The rotary atomizing head 44 is constituted by an atomizing head main body 45 and a hub member 48 described later.

Reference numeral 45 denotes an atomizing head main body formed in a bell shape.
The atomizing head main body 45 includes a paint atomizing portion 46 located on the front side and a mounting cylinder portion 47 located on the rear side similarly to the atomizing head body 5 according to the first embodiment. The conversion part 46 is constituted by a paint thinning surface 46A and a discharge edge 46B.

Reference numeral 47 denotes a mounting tube portion provided on the rear side of the atomizing head main body 45 according to the present embodiment.
It is formed as a tapered cylindrical portion 47A having a tapered hole having a smaller diameter from the rear end side (opening side) toward the back side.
An annular partition wall 47B is formed at the back of the mounting cylinder portion 47, and a rear end surface 47C of the mounting cylinder portion 47 faces the step portion 42B of the mounting shaft portion 42.

Reference numeral 48 denotes a paint thinning surface 46 of the atomizing head main body 45.
A disk-shaped hub member provided on the A side,
The first hub hole 48A and the second hub hole 48B are formed similarly to the hub member 8 according to the first embodiment.

Reference numeral 49 denotes a slack preventing means according to the present embodiment.
And a mounting cylinder part 47 of the rotary atomizing head 44, and is constituted by a male screw part 50, a female screw part 51, and O-rings 52 and 53.

Reference numeral 50 denotes a male screw portion provided on the mounting shaft portion 42 of the rotating shaft 41. The male screw portion 50 has a tapered shaft portion 42.
A is arranged on the distal end side of A, and is constituted by a thread groove 50A formed on the outer periphery of the mounting shaft portion 42.

Reference numeral 51 denotes a female screw portion provided on the mounting cylinder portion 47 of the rotary atomizing head 44. The female screw portion 51 is disposed on the inner side of the tapered cylindrical portion 47A. It is constituted by the formed screw groove 51A.

Reference numeral 52 denotes a first O-ring mounted between the step portion 42B of the rotating shaft 41 and the rear end face 47C of the rotary atomizing head 44. The O-ring 52 has a circular cross section made of rubber material or the like. It is formed as a ring and is mounted on the base end side of the tapered shaft portion 42A. When the rotary atomizing head 44 is screwed onto the rotary shaft 41, the O-ring 52
It is sandwiched between the first step portion 42B and the rear end surface 47C of the rotary atomizing head 44 while being elastically deformed.

Reference numeral 53 denotes a second O-ring provided on the inner side of the mounting cylinder portion 47. The O-ring 53 is provided between the distal end surface 42C of the rotary shaft 41 and the annular partition 47B of the rotary atomizing head 44. , And is formed of a rubber material or the like, like the O-ring 52. Then, a rotary atomizing head 44 is attached to the rotating shaft 41.
Is screwed, the O-ring 53 is sandwiched between the distal end surface 42C of the rotary shaft 41 and the annular partition 47B of the rotary atomizing head 44 while being elastically deformed.

Thus, in the present embodiment thus configured, substantially the same operation and effect as those of the first embodiment can be obtained. However, in the present embodiment, the first O-ring 52 is mounted between the step portion 42B of the rotary shaft 41 and the rear end surface 47C of the rotary atomizing head 44, and the front end surface 42C of the rotary shaft 41 is Since the second O-ring 53 is mounted between the head 44 and the annular partition 47B, the O-rings 52 and 53 are rotated even if the mounting cylinder 47 of the rotary atomizing head 44 is enlarged by high-speed rotation. Shaft 41
And the rotary atomizing head 44 can be reliably contacted.
For this reason, even during high-speed rotation, a frictional force in the rotational direction can be constantly applied between the rotating shaft 41 and the rotary atomizing head 44, and the loosening of the rotary atomizing head 44 can be prevented. .

Further, as the tightening force is increased by tightening the male screw portion 50 and the female screw portion 51, the tip surface 42 of the rotating shaft 41 is increased.
C approaches the annular partition 47B of the rotary atomizing head 44, and the step 42B of the rotating shaft 41 approaches the rear end face 47C of the rotary atomizing head 44. As a result, by tightening the male screw portion 50 and the female screw portion 51, the deformation of the O-rings 52 and 53 can be increased, and the resistance can be increased.

In the present embodiment, the loosening prevention means 4
9, the first and second O-rings 52 and 53 are mounted between the rotary shaft 41 and the rotary atomizing head 44.
As in the first modification shown in FIG. 7, the ring fitting grooves 12 and 13 according to the first embodiment are provided not only on the O-rings 52 and 53 but also on the tapered shaft portion 42A of the rotating shaft 41 as the loosening prevention means 61. It is also possible to provide the same ring fitting grooves 62 and 63 as described above, and to fit the O-rings 64 and 65 into the ring fitting grooves 62 and 63.

In this case, four O-rings 52, 53, 6
The frictional force can be applied between the rotary shaft 41 and the rotary atomizing head 44 by using 4, 65, thereby increasing the fastening force of the rotary atomizing head 44 and reliably preventing the rotary atomizing head 44 from loosening. be able to.

Also, as in a second modification shown in FIG.
In addition to the O-rings 52 and 53, the ring fitting groove 7 similar to the ring fitting grooves 32 and 33 according to the second embodiment is provided on the tapered cylindrical portion 47A of the rotary atomizing head 44 as the loosening prevention means 71.
2, 73 may be provided, and O-rings 74, 75 may be fitted into the ring fitting grooves 72, 73.

Next, FIGS. 9 and 10 show a fourth embodiment of the present invention. The feature of this embodiment is that a ring fitting groove is provided in a mounting shaft portion of a rotating shaft, and the ring fitting groove is provided. An O-ring is fitted into the groove, and a ring-engaging groove for elastically engaging with the O-ring is provided in the mounting cylinder of the rotary atomizing head.

In the figure, reference numeral 81 denotes a rotating shaft of the air motor. The rotating shaft 81 is formed in a hollow like the rotating shaft 1 according to the first embodiment, and rotates at a high speed.

Reference numeral 82 denotes a mounting shaft portion provided on the distal end side of the rotating shaft 81 according to the present embodiment. The mounting shaft portion 82 has a tapered shape with a smaller diameter from the base end side of the rotating shaft 81 toward the distal end side. The shaft 82A is formed.

Reference numeral 83 denotes a feed tube provided so as to be inserted into the rotary shaft 81. The distal end of the feed tube 83 protrudes from the distal end of the mounting shaft 82 and extends into a rotary atomizing head 84 described later. are doing.

Reference numeral 84 denotes a rotary atomizing head mounted on the tip end of the rotary shaft 81. The rotary atomizing head 84 is constituted by an atomizing head main body 85 and a hub member 88 described later.

Reference numeral 85 denotes a bell-shaped atomizing head main body.
The atomizing head main body 85 includes a paint atomizing portion 86 located on the front side and a mounting cylinder portion 87 located on the rear side, similarly to the atomizing head body 5 according to the first embodiment. The conversion portion 86 is constituted by a paint thinning surface 86A and a discharge edge 86B.

Reference numeral 87 denotes a mounting tube portion provided on the rear side of the atomizing head main body 85 according to the present embodiment.
It is formed as a tapered cylindrical portion 87A having a tapered hole having a smaller diameter from the rear end side (opening side) toward the inner side.
Further, an annular partition 87B is formed in the inner part of the mounting cylinder 87.

Reference numeral 88 denotes a paint thinning surface 86 of the atomizing head main body 85.
A disk-shaped hub member provided on the A side,
The first hub hole 88A and the second hub hole 88B are formed in the same manner as the hub member 8 according to the first embodiment.

Reference numeral 89 denotes a slack preventing means according to the present embodiment.
And a mounting cylinder portion 87 of the rotary atomizing head 85, and is constituted by a male screw portion 90, a female screw portion 91, ring fitting grooves 92, 93, elastic rings 94, 95, and ring engaging grooves 96, 97. .

Reference numeral 90 denotes a male screw portion provided on the mounting shaft portion 82 of the rotating shaft 81. The male screw portion 90 has a tapered shaft portion 82.
A is arranged on the distal end side of A, and is constituted by a screw groove 90A formed on the outer periphery of the mounting shaft portion 82.

Reference numeral 91 denotes a female screw portion provided on the mounting cylinder portion 87 of the rotary atomizing head 84. The female screw portion 91 is disposed on the inner side of the tapered cylindrical portion 87A. It is constituted by the formed screw groove 91A.

Reference numerals 92 and 93 denote ring fitting grooves provided on the mounting shaft portion 82 of the rotating shaft 81.
The tapered shaft portion 8 is located on the outer peripheral surface of the mounting shaft portion 82 similarly to the ring fitting grooves 12 and 13 according to the first embodiment.
2A is recessed. Then, the ring fitting grooves 92, 9
Numerals 3 are arranged apart from each other in the axial direction, and are annularly recessed so as to open radially outward.

Reference numerals 94 and 95 denote O-rings as elastic rings fitted in the ring fitting grooves 92.
95 is formed as a ring having a circular cross section from a rubber material or the like. The outer diameter of the O-rings 94 and 95 is set to a value such that a part of the O-rings 94 and 95 projects outside from the ring fitting grooves 92 and 93 when the O-rings 94 and 95 are fitted in the ring fitting grooves 92 and 93. .

Reference numerals 96 and 97 denote mounting cylinder portions 8 of the rotary atomizing head 84.
7, the ring engaging groove 9
Reference numerals 6 and 97 are arranged at positions facing the ring fitting grooves 92 and 93 of the rotating shaft 81 with the rotating atomizing head 84 screwed to the rotating shaft 81. Thereby, when the rotary atomizing head 84 is screwed onto the rotary shaft 81, the ring fitting grooves 92, 9 are formed.
The O-rings 94 and 95 in 3 are elastically engaged with the ring engagement grooves 96 and 97.

Thus, in the present embodiment thus configured, substantially the same operation and effect as in the first embodiment can be obtained. However, in the present embodiment, the O-ring 9
Since the ring engagement grooves 96 and 97 which elastically engage with the ring engagement grooves 96 and 97 are provided,
As a result, the frictional force between the rotating shaft 81 and the rotary atomizing head 84 can be increased.

Since the O-rings 94 and 95 enter and engage with the ring engaging grooves 96 and 97, the rotary atomizing head 84 is prevented from being displaced in the axial direction with respect to the rotary shaft 81. can do. For this reason, the falling of the rotary atomizing head 84 can be reliably prevented, and the reliability can be improved.

In this embodiment, the rotating shaft 81 is provided with the ring fitting grooves 92, 93, and the ring fitting grooves 92, 9 are provided.
3 and O-rings 94 and 95 are fitted on the rotary atomizing head 84.
6, 97, but a ring fitting groove is provided on the rotary atomizing head as in the second embodiment, an O-ring is fitted into the ring fitting groove, and the O-ring is fitted on the rotating shaft. A configuration in which a ring engaging groove that elastically engages with the ring may be provided.

In each of the above embodiments, the mounting shafts 2, 22, 42, and 82 are connected to the tapered shafts 2A, 22A, and 4 respectively.
2A, 82A, and the mounting cylinders 7, 27, 47,
87 is formed as a tapered cylindrical portion 7A, 27A, 47A, 87A. However, the present invention is not limited to this, and the mounting shaft portion 2 'is formed as a cylindrical cylindrical shaft portion 2A' as in a modification shown in FIG. It may be formed as a portion 7A '.

In each of the above embodiments, the rotating shaft 1,
O-ring 1 on 41, 81 or rotary atomizing heads 24, 44
4,15,34,35,64,65,74,75,9
4, 95, two ring fitting grooves 12, 13, 3
2, 33, 62, 63, 72, 73, 92, 93 are provided, but one ring fitting groove may be provided, or three or more ring fitting grooves may be provided. .

Further, in each of the above embodiments, the O-ring having a circular cross section or an elliptical cross section has been exemplified as the elastic holding member. However, for example, another cross section such as a polygonal shape may be used.

Further, in each of the above embodiments, the case where the atomization head main body is formed in a bell shape is exemplified. However, the atomization head main body is formed in a cylindrical shape having a large diameter toward the discharge edge. Alternatively, it may be formed in a substantially disk-shaped disk shape.

In each of the above embodiments, the atomizing head main bodies 5, 25, 45, 85 are formed of a metal material or a conductive resin material.
A direct charging type rotary atomizing head type coating apparatus that directly charges a paint to a high voltage via the above has been described as an example, but the present invention is not limited to this, and for example, a rotary atomizing head type coating apparatus. An external electrode may be provided on the outer peripheral side of the cover, and the external electrode may be applied to a rotary atomizing head type coating apparatus of an indirect charging type in which the paint sprayed from the rotary atomizing head is indirectly charged to a high voltage.

Further, in each of the above embodiments, the air motor is used as the rotation source. However, the present invention is not limited to this. For example, an electric motor may be used as the rotation source.

[0122]

As described in detail above, according to the first aspect of the present invention, the male screw provided on the rotary shaft, the female screw provided on the rotary atomizing head, the mounting shaft of the rotary shaft and the rotary shaft are provided. The elastic ring provided between the mounting cylinder of the atomizing head and the elastic ring is sandwiched while being elastically deformed between the mounting shaft of the rotary shaft and the mounting cylinder of the rotary atomizing head. And a rotary atomizing head with a rotational frictional force. For this reason, even when the rotating shaft during high-speed rotation suddenly stops, for example, the frictional force of the elastic ring can provide resistance to the rotation of the rotating atomizing head with respect to the rotating shaft in the direction in which the rotating head is loosened. By stopping the atomization head, the rotation atomization head can be prevented from loosening and falling off, and the reliability can be improved.

According to the second aspect of the present invention, since the elastic ring is mounted between the outer circumference of the mounting shaft of the rotary shaft and the inner circumference of the mounting cylinder of the rotary atomizing head, the elastic ring is mounted on the outer circumference of the mounting shaft. By applying a frictional force to the entire surface and the inner peripheral surface of the mounting cylinder portion over the entire circumference, resistance can be given to rotation in the loosening direction.

According to the third aspect of the present invention, a ring fitting groove is provided on one of the mounting shaft portion of the rotary shaft and the mounting cylinder portion of the rotary atomizing head, and the elastic fitting ring is provided in the ring fitting groove. The elastic ring can be attached to either one of the mounting shaft portion of the rotating shaft and the mounting cylinder portion of the rotary atomizing head by using the ring fitting groove. Then, by screwing the rotary atomizing head to the rotating shaft, the elastic ring can be sandwiched while being elastically deformed between the mounting shaft portion and the mounting cylinder portion, and the rotary atomizing head is moved by the friction force of the elastic ring. Can be stopped.

According to the fourth aspect of the present invention, a plurality of ring fittings are spaced apart in the axial direction of the rotary shaft on one of the mounting shaft portion of the rotary shaft and the mounting cylindrical portion of the rotary atomizing head. Since the attachment grooves are provided and the elastic rings are fitted in the respective ring fitting grooves, the rotation atomizing head can be loosened by a plurality of elastic rings, and the reliability can be improved.

According to a fifth aspect of the present invention, an elastic ring is elastically engaged with one of the mounting shaft of the rotary shaft and the mounting cylinder of the rotary atomizing head at a position facing the ring fitting groove. Since the matching ring engaging groove is provided, the contact area between the elastic ring and the ring engaging groove can be increased, and the frictional force acting between the rotating shaft and the rotating atomizing head can be increased. Further, since the elastic ring enters into and engages with the ring engaging groove, it is possible to prevent the rotary atomizing head from being displaced in the axial direction with respect to the rotary shaft. For this reason, the falling of the rotary atomizing head can be reliably prevented, and the reliability can be improved.

According to the sixth aspect of the present invention, the elastic ring is mounted between the annular partition wall on the inner side of the mounting cylinder of the rotary atomizing head and the tip end surface of the mounting shaft of the rotary shaft. When the rotary atomization head is screwed onto the mounting shaft, the distal end surface of the mounting shaft advances toward the inner side of the mounting cylinder. The elastic ring is sandwiched between the end surface of the rotating shaft and the annular partition wall of the rotary atomizing head, and makes contact while being elastically deformed. Can be stopped.

According to the seventh aspect of the present invention, the mounting shaft of the rotary shaft is provided with a step facing the end surface of the mounting cylinder of the rotary atomizing head, and the elastic ring is connected to the step of the rotary shaft by the rotary atomizer. When the rotary atomizing head is screwed onto the mounting shaft, the rear end surface of the mounting cylinder advances toward the step of the mounting shaft. I do. The elastic ring is elastically deformed and sandwiched between the rear end surface of the mounting cylinder and the step of the mounting shaft, so that the elastic ring generates a frictional force in the rotating direction with respect to the rotary atomizing head, Can be stopped.

According to the eighth aspect of the present invention, since the mounting shaft is formed as a tapered shaft and the mounting cylinder is formed as a tapered cylindrical portion, the female screw of the rotary atomizing head is attached to the male screw of the rotary shaft. Is screwed, the tapered shaft portion of the rotary shaft abuts on the tapered cylindrical portion of the rotary atomizing head, so that the axial centers of the rotary atomizing head and the rotary shaft can be matched. When an elastic ring is provided between the tapered shaft portion and the tapered cylindrical portion,
The elastic ring can be sandwiched between the tapered shaft portion and the tapered cylindrical portion while being elastically deformed. For this reason, the frictional force in the rotating direction can be applied between the rotating shaft and the rotary atomizing head by the elastic ring, and the loosening of the rotary atomizing head can be prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a rotary shaft and a rotary atomizing head according to a first embodiment.

FIG. 2 is an enlarged cross-sectional view showing a main part of FIG.

FIG. 3 is a sectional view showing a rotary shaft and a rotary atomizing head according to a second embodiment.

FIG. 4 is an enlarged cross-sectional view of a main part, showing a portion B in FIG. 3 in an enlarged manner.

FIG. 5 is a sectional view showing a rotary shaft and a rotary atomizing head according to a third embodiment.

FIG. 6 is an enlarged cross-sectional view of a main part showing a C part in FIG.

FIG. 7 is a sectional view showing a rotary shaft and a rotary atomization head according to a first modification of the third embodiment.

FIG. 8 is a sectional view showing a rotary shaft and a rotary atomizing head according to a second modification of the third embodiment.

FIG. 9 is a sectional view showing a rotary shaft and a rotary atomizing head according to a fourth embodiment.

FIG. 10 is an enlarged sectional view of a main part, showing a D part in FIG. 9 in an enlarged manner.

FIG. 11 is a cross-sectional view showing a rotary shaft and a rotary atomizing head according to a modification.

FIG. 12 is a sectional view showing a rotary atomizing head type coating apparatus according to the related art.

FIG. 13 is an enlarged sectional view of a main part showing a rotary shaft and a rotary atomizing head of a rotary atomizing head type coating apparatus according to the related art.

[Explanation of symbols]

1,21,41,81,1 'Rotating shaft 2,22,42,82,2' Mounting shaft 2A, 22A, 42A, 82A Tapered shaft 4,24,44,84,4 'Rotary atomizing head 6, 26, 46, 86, 6 'Paint atomizing part 7, 27, 47, 87, 7' Mounting cylinder part 7A, 27A, 47A, 87A Tapered cylinder part 9, 29, 49, 61, 71, 89, 9 'Loosening prevention means 10, 30, 50, 90, 10' Male thread 11, 31, 51, 91, 11 'Female thread 12, 13, 32, 33, 52, 53, 62, 63, 7
2, 73, 92, 93, 12 ', 13' Ring fitting groove 14, 15, 34, 35, 54, 55, 64, 65, 7
4, 75, 94, 95, 14 ', 15' O-ring (elastic ring) 96, 97 Ring engaging groove

Claims (8)

[Claims] 1. A rotating source that rotates at a high speed, a rotating shaft whose base end in the axial direction is rotatably supported by the rotating source, a leading end protrudes from the rotating source and serves as a mounting shaft, and a front end is supplied. In a rotary atomizing head type coating apparatus comprising a rotary atomizing head which becomes a paint atomizing section for atomizing the paint to be sprayed, and a rear side of which becomes a mounting cylinder portion which is screwed and mounted on the mounting shaft portion of the rotary shaft. Wherein the rotating shaft and the rotary atomizing head are provided with loosening preventing means for preventing the rotary atomizing head from being loosened with the rotary atomizing head attached to the rotating shaft; A male screw part provided on the outer circumference of the part and having a thread groove formed on the outer circumference; and a screw provided on the inner circumference of the mounting cylinder part and screwing in a direction to be tightened to the male screw part when the rotating shaft rotates. The female screw part with a groove, the mounting shaft part of the rotary shaft and the rotary atomizing head A rotating elastic member provided between the cylindrical member and the elastic member, the elastic member providing resistance to rotation of the rotary atomizing head in a loosening direction by frictional force of the elastic member. Atomizing head type coating equipment. 2. The rotary atomizing head type according to claim 1, wherein the elastic ring is mounted between an outer circumference of a mounting shaft portion of the rotary shaft and an inner circumference of a mounting cylindrical portion of the rotary atomizing head. Painting equipment. 3. A ring fitting groove is provided on one of the mounting shaft portion of the rotating shaft and the mounting cylinder portion of the rotary atomizing head, and the elastic ring is fitted in the ring fitting groove. Claim 1
Or the rotary atomizing head type coating apparatus according to 2. 4. A plurality of ring fitting grooves are provided on one of the mounting shaft portion of the rotary shaft and the mounting cylinder portion of the rotary atomizing head so as to be spaced apart in the axial direction of the rotary shaft. 3. The rotary atomizing head type coating apparatus according to claim 1, wherein the elastic ring is fitted in each of the ring fitting grooves. 5. The elastic ring is resiliently engaged with one of the mounting shaft of the rotary shaft and the mounting cylinder of the rotary atomizing head at a position facing the ring fitting groove. 5. The rotary atomizing head type coating apparatus according to claim 3, wherein a ring engaging groove is provided. 6. The rotary atomizing head is provided with an annular partition at the inner side of the mounting cylinder to separate the paint atomizer from the mounting cylinder. 6. The rotary atomizing head type coating apparatus according to claim 1, wherein the rotary atomizing head type coating apparatus is mounted between a partition wall and a tip end surface of a mounting shaft portion of the rotary shaft. 7. A rotary shaft is provided with a step facing a rear end surface of a mounting cylinder of the rotary atomizing head, and the elastic ring is provided with a step of the rotary shaft and the rotary atomizer. 5. The head is mounted between the rear end face of the mounting cylinder and the head.
7. The rotary atomizing head type coating apparatus according to 5 or 6. 8. A mounting shaft portion of the rotary shaft is formed as a tapered shaft portion having a tapered shaft having a smaller diameter toward a front end side, and a mounting cylindrical portion of the rotary atomizing head is formed from a rear end side. 2. A tapered cylindrical portion having a smaller diameter toward the inner side and having a tapered hole into which the tapered shaft portion is inserted.
The rotary atomizing head type coating apparatus according to 2, 3, 4, 5, 6, or 7.