JPS5827834Y2 - Powder classification equipment - Google Patents

Description

[Detailed Description of the Invention] The disclosed technology uses air pressure to drive a rotating airbrush to unclog a sieve screen in a powder classification device.

Therefore, in this invention, a cylindrical frame disposed on a base via a spring is vibrated by a vibration generator, and a sieve screen stretched inside the frame is used to finely fine the powder. The present invention relates to a powder classification device in which classification is performed and clogging of the sieve screen can be cleared by blowing air from a rotating air brush disposed below the sieve screen,
In particular, the rotary shaft of the air brush is rotated by the rotational force generated by the driving blades provided in the support on the bottom plate of the frame and the rotational force generated by the vibration of the frame. This relates to a powder classification device in which air for use and air for ejection from an air nozzle are supplied through separate introduction pipes.

Generally, a powder classification device used to classify coarse powder of powder paint is configured to perform classification by the sieving action of a sieve screen installed in a frame that is vibrated by a vibration generator. .

The sieve screens used in such powder classification devices are prone to clogging, but as a means to prevent this clogging, air is ejected from the air nozzle of a rotating air brush installed below the sieve screen. Some devices use air to clean the mesh.

However, some conventional drive mechanisms for rotating air brushes use an electric motor to drive the air brush's rotating shaft, but in this case the motor must be installed inside the frame. First, not only does the frame become larger, but also powder accumulates on the motor.

On the other hand, when the motor is installed outside the frame, the sealing structure between the frame and the rotating shaft becomes complicated.

Another possible method is to support the rotary shaft of the rotary air brush so that it can rotate freely, and rotate the rotary air brush by the vibration of the frame, but the rotation will be irregular and the number of revolutions cannot be adjusted. There are advantages.

In view of the problems with the rotary airbrush drive mechanism in conventional powder classification equipment, this idea uses a combination of the vibration force of the frame and air drive as the airbrush rotation drive mechanism, eliminating the above disadvantages and disadvantages. The object of the present invention is to provide a powder classification device equipped with an efficient rotary air brush that eliminates the need for a rotary air brush.

The structure of this invention in accordance with the above purpose is that the rotating shaft of the rotating air brush provided under the sieve screen in the frame has drive vanes in the support, and the air introduced into the support and the vibration of the frame A driving force is applied to the rotating shaft, and separate supply lines are provided for the air used as this driving force and the air that is guided into the rotating air brush and injected from the air nozzle to the sieve screen. This is a summary.

Next, an embodiment of this invention will be described below based on the drawings.

Fig. 1 is a longitudinal sectional view showing the entire powder classification device, Fig. 2 is a transverse sectional view showing the rotating shaft support part of the rotating air brush, and Fig. 3 is a longitudinal sectional view showing the entire powder classification device.
The figure is a longitudinal sectional view.

Reference numeral 1a denotes a cylindrical upper frame, and 1b denotes a cylindrical lower frame. The upper frame 1a and the lower frame 1b are joined via seven flange 1C.

The lower frame body 1b is installed on the base frame 2 via a spring 3.

The bottom plate 4 of the lower frame 1b has a conical chute surface with a high central portion, and a variable speed drive motor 6 that rotates an unbalanced weight 5 is fixedly installed on the lower center surface of the bottom plate 4 to generate vibration. The device is formed.

Further, a sieve screen 7 is stretched inside the upper frame 1a,
The sieve screen 7 divides the upper chamber A and the lower chamber B. A powder supply port 9 is provided in the upper lid 8 of the upper chamber A, and a coarse powder discharge port 10 is provided in the side surface of the upper chamber A. ing.

On the other hand, in the lower chamber B, a fine powder discharge port 11 is provided laterally at the lowest part of the chute surface of the bottom plate 4.

A rotating air brush 12 is provided adjacent to the lower side of the sieve screen 7, and a rotating shaft 13 connected to the center of the air brush 12 is connected to a support 1 provided on the upper center surface of the bottom plate 14.
Supported by 4.

The inside of the support body 14 supporting the rotating shaft 13 is a second
This is shown in the cross-sectional view of FIG. 3 and the vertical cross-sectional view of FIG.

The support body 14 is formed in a cylindrical shape, and the rotation shaft 1
3 are two bearings 15a provided within the support body 14;
It is rotatably supported by 15b.

Further, an air chamber 16 is formed in the upper part of the support body 14, and a packing 17a is installed in the lower part of the air chamber 16, and the bearing 15 in the support body 14 is
An air seal is formed between the air chamber 16 and the support part a, and another gasket 17b is installed in the upper part of the air chamber 16, and an air seal is formed between the lid body 18 attached to the upper end of the support body 14. There is.

Inside this air chamber 16, the rotating shaft 13 has a large number of drive vanes 19 radially arranged.

Further, an air introduction path 20 for rotationally driving the drive blade 19 is vertically bored in the support body 14, and the lower end of the air introduction path 20 is disposed at the lower end of the bottom plate 4. The air introduction pipe 21 is connected to the air introduction pipe 21.

On the other hand, a small volume air chamber 22 is formed at the upper end of the air introduction path 20, and a jet nozzle 23 is bored from the air chamber 22 into the air chamber 16.

This jet nozzle 23 is provided at an angle that allows air to be jetted perpendicularly to the drive vane 19 in the air chamber 16.

An air discharge passage 24 is vertically bored at a position opposite to the air introduction passage 20 in the support body 14,
An air passage 25 is formed at the upper end thereof and communicates with the air chamber 16, and a lower end of the air discharge passage 24 is connected to an air discharge pipe 26 disposed below the bottom plate 4.

In FIG. 3, the air discharge passage 24 is shown at a position symmetrical to the air introduction passage 20 for convenience of illustration, but in reality, as shown in FIG. The air passage 25 is formed so as to face the drive blade 19 at right angles, and the air passage 25 and the jet nozzle 23 are formed in a parallel state.

On the other hand, an air passage 28 is bored in the axial center of the rotating shaft 13 and communicates with a large number of air nozzles 27 bored in the upper part of the rotating air brush 12.
Its lower end is connected to a clogging prevention air introduction pipe 29 disposed below the bottom plate 4.

Further, the contact portion between the rotating shaft 13 and the bottom plate 4 is sealed by a packing 30.

In order to perform coarse classification of powder paint using the powder classifier having the above configuration, the variable speed motor 6 fixed on the bottom plate 4 of the lower frame 1b is driven to rotate the unbalanced weight 5 to separate the powder paint from the upper frame. The body 1a and the lower frame body 1b are vibrated.

When the powder paint is supplied into the upper frame 1a through the powder supply hole 9 formed on the upper lid 8, the mesh of the vibrating sieve screen 7 performs a classification action, and the coarse powder is transferred to the coarse powder waste. The fine powder is discharged from the outlet 10, falls onto the bottom plate 4, slides down the tapered surface of the bottom plate 4, and is discharged from the fine powder discharge port 11 outside the frame.

During this time, the rotary air brush 12 starts to rotate irregularly due to the vibration of the lower frame 1b, but when air is further supplied from an air pump (not shown) to the rotary drive air introduction pipe 21, this air flows into the air introduction path 20. , through the air chamber 22, and from the jet nozzle 23 to the air chamber 1.
It is squirted in 6.

The air jetted from this jet nozzle 23 is
The drive blade 19 provided in the
A rotational force is generated at 3, and this air is released into the atmosphere from the air discharge pipe 26, and the rotary air brush 12 is rotated by the synergistic effect of the rotational force caused by this air drive and the rotational force caused by the vibration of the lower frame 1b described above. do.

At the same time, air introduction pipe 2 from the air pump to prevent clogging
When air is supplied into the air passage 28 of the rotary shaft 13 through the rotary air brush 12 , the air is injected from the upper air nozzle 27 of the rotary air brush 12 .

The air jetted from the air nozzle 27 is uniformly sprayed onto the lower surface of the sieve screen 7 by the rotating air brushes 12ρp, . can be effectively prevented from occurring.

Next, FIGS. 4 and 5 are a cross-sectional view and a vertical cross-sectional view of a support portion showing another embodiment.

In this embodiment, a cylindrical support 31 is provided on the upper gasket 17b of the air chamber 16 in which the drive blade 19 of the rotary shaft 13 rotates, and a cylindrical support 31 is provided to press the gasket 17b. 32 are provided.

Furthermore, an air introduction path 3 for preventing clogging is provided inside the support body 14.
3 is perforated in the vertical direction, and its upper end is connected to the air passage 3.
4 to the air chamber 32, and the lower end of the air passage 34 is connected to an air introduction pipe 35 disposed below the bottom plate 4.

Thus, the air passage 28 formed in the axis of the rotating shaft 13
The lower end thereof is communicated with the air chamber 32 via an air conduit 36, and the air for clogging prevention supplied from the air introduction pipe 35 and the air passage 34 into the air chamber 32 is supplied from the air conduit 36. The air is sent into the air passage 28 of the rotating shaft 13 and is injected from the air nozzle 27 of the rotating air brush 12.

Next, FIGS. 6 and 7 are a cross-sectional view and a longitudinal cross-sectional view of a support portion showing still another embodiment.

This embodiment is substantially the same as the embodiment shown in FIGS.
6 is connected to a direct air introduction pipe 37 and an air discharge pipe 38, and a direct air introduction pipe 39 is also connected to the air chamber 32 that introduces air for clogging prevention into the air passage 28 of the rotating shaft 13. has been done.

Further, air communication passages 40 are radially bored in the attachment portion of the drive blades 19 of the rotating shaft 13, and the air injected into the air chamber 16 from the injection nozzle 23 is introduced between each drive blade 19. A uniform driving force is applied to the driving blades 19.

It should be noted that the aspect of this invention is not limited to the above-mentioned embodiment, and it goes without saying that other structures such as piping of the air introduction path are possible.

As described above, according to this invention, in a powder classification device equipped with a rotating air brush having an air nozzle on the underside of the sieve screen, the rotating air nozzle combines the vibration force of the frame with the air driving force. Since the rotation is caused by a synergistic action, the structure is simplified compared to a rotational drive mechanism including a motor, gears, etc., and the accumulation of powder on the motor is prevented.

Further, since the rotating air brush rotates regularly by air drive, the sieve screen is uniformly unclogged.

Furthermore, since the air for driving the rotating air brush and the air for preventing clogging of the rotating air brush are supplied through separate lines, the pressure of the air for driving the rotating air brush can be adjusted to adjust the rotation speed. This has the effect of making it easy to adjust.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention; Fig. 1 is a longitudinal cross-sectional view showing the entire powder classification device, Fig. 2 is a cross-sectional view of the rotating shaft support, and Fig. 3 is a vertical cross-sectional view. , FIG. 4 is a cross-sectional view of a support according to another embodiment, FIG. 5 is a longitudinal cross-section, FIG. 6 is a cross-sectional view of a support according to another embodiment, and FIG. 7 is a longitudinal cross-section. be. 5... Unbalanced weight, 6...
Variable speed motor, 1a... Upper frame, 1b...
... Lower frame body, 2 ... Base frame, 7 ...
... Sieve screen, A ... upper chamber, B ... lower chamber,
9...Powder supply port, 10...Coarse powder discharge port, 11...Fine powder discharge port, 27...Air nozzle, 12... ...Rotating air brush, 13
... Rotating shaft, 4 ... Bottom plate, 14 ...
... Support body, 16 ... Air chamber, 19
・・・・・・Drive vane, 21゜37・・・Air introduction pipe for rotational drive, 29.39・・・Air introduction pipe for clogging prevention, 28・・・Air aisle.

Claims (1)

[Scope of utility model registration request] A cylindrical frame equipped with a vibration generator is disposed on the base via a spring, and the cylindrical frame is divided into an upper chamber and a lower chamber by a sieve screen, and the upper chamber contains powder. A coarse powder supply port and a coarse powder discharge port are opened in the lower chamber, and a rotary air nozzle having a plurality of air nozzles is disposed below the sieve screen, and a shaft of the rotary air brush is provided. is rotatably supported by a support provided on the bottom plate of the frame, wherein the shaft of the rotating air brush has a driving blade within an air chamber within the support. An air introduction pipe for rotational driving is connected to the air chamber, and an air introduction pipe for preventing clogging is connected to the support, and the air nozzle is connected within the shaft of the rotating air brush. A powder classification device characterized in that an air passage bored so as to communicate with the air introduction pipe for preventing clogging.