JPS6156066B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a sandblasting device that enables stable and highly efficient jetting.

[Technical background of the invention]

Conventionally, as shown in Fig. 3, a pressure-feeding type sandblasting device for polishing the surface of, for example, a frame of eyeglasses, has a pressure-feeding tube (L) equipped with a micro-injection nozzle at the tip, and an opening (C) on the side of this pressure-feeding tube (L). A pressure tank housing an abrasive therein, a pressurizing port for high-pressure air opened to this pressure tank, and a branch high-pressure air that is separated from this air and supplied to the pressure feed pipe B through a flow rate adjustment valve. The branched high-pressure air and the abrasive agent D jetted from the opening C are mixed with the high-pressure air pumped from the pressurizing port G, and the mixture is injected from the injection nozzle to achieve the desired blast polishing. It was beginning to be done.

[Problems with background technology]

However, if the inner diameter of the injection nozzle is
When using an ultra-fine nozzle of about 0.5 m/m, if the opening C and the abrasive agent D are not both small, the abrasive agent D will be fixed in the shape of a bridge at the opening C, resulting in the inconvenience of not being able to be pumped, or the injection nozzle will not be able to prevent the bridging. It was also impossible to form and transport under pressure. Therefore, it has the disadvantage that it is not possible to stably spray the material with a uniform concentration onto the object to be polished.

[Purpose of the invention]

The present invention has been made in order to eliminate the above-mentioned drawbacks, and provides a sandblasting device that can make the injection nozzle diameter extremely small, obtain an appropriate mixing ratio of abrasives, and enable stable and highly efficient injection. The purpose is to provide.

[Summary of the invention]

High-pressure air is injected into the inner bottom of the pressurized tank to fluidize the abrasive together with the air, and the abrasive is supplied to the mixing pipe connected to the injection mechanism, and a portion of the high-pressure air is injected from the side of the mixing pipe into the air stream. The purpose is to supply the abrasive to air to obtain an appropriate mixing ratio of the abrasive and air.

[Embodiments of the invention]

Hereinafter, details of the present invention will be explained by way of an embodiment with reference to FIGS. 1 and 2. FIG. 1 shows a sandblasting device, and 1 is a sandblasting chamber, which has an injection mechanism 4 facing a transport pipe 3 having a fine injection nozzle 2 attached to its tip. 5
6 is a dust collection room, and 6 is an exhaust fan room, which is designed to be able to collect dust from an exhaust port 7 into the dust collection room 5.
Reference numeral 8 denotes a net having a mesh through which the abrasive 9 can pass, and partitions the blasting chamber 1 from the hopper 10 located below. Reference numeral 11 denotes a tap valve disposed at the bottom of the hopper 10, which allows the abrasive 9 accumulated in the hopper 10 to be transferred to a pressurized tank 1 disposed at the bottom of the hopper 10.
2. 13 is the exhaust pipe,
An exhaust valve 14 is provided on the way, and when the abrasive 9 runs out in the pressurized tank 12, the exhaust valve 14 is opened and the tank 12 is removed.
The pressure inside can be reduced through a filter 15. A supply device 16 is attached to the pressurized tank 12 and supplies abrasive-mixed air to the injection mechanism 4. As shown in the detailed view of FIG. 2, this supply device 16 has a high-pressure air supply port 17 that opens on the side of the pressurized tank 12, and a lower surface that opens inside the tank 12 and is disposed vertically and connected to the transport pipe 3. A mixing tube 21 consisting of a continuous inner mixing tube 18 and an outer mixing tube 20 disposed with a gap 19 outside the inner mixing tube 18.
and a concentration adjustment mechanism 22 interposed between the supply port 17 and the mixing inner pipe 18. One of the high-pressure air flowing in from the supply port 17 is jetted downward from the gap 19 to polish the bottom of the tank 12. Fluidize agent 9. The other high-pressure air is used to adjust the abrasive mixed air flowing into the mixing inner pipe 18 through the needle port 23 of the concentration adjustment mechanism 22 to an appropriate mixing ratio.

Next, learn how to operate. One side of the air supplied into the tank 12 from the high-pressure air supply port 17 is accelerated and blown toward the bottom of the tank 12 from the gap 19 of the mixing pipe 21. Due to this blowing force, the abrasive 9 is mixed with air and fluidized.
The air mixed with the abrasive 9 riding on this airflow is then passed from the mixing inner pipe 18 through the transport pipe 3 to the injection mechanism 4.
supplied to Therefore, there is no bridging caused by the abrasive 9 near the lower part of the inner tube 18, and stable supply can be achieved. The other air supplied from the supply port 17 is supplied to the mixing inner pipe 18 by adjusting the opening degree of the needle port 23 of the concentration adjustment mechanism 22 to adjust the concentration of the abrasive mixed air. The mixture ratio of air and abrasive can be optimized.

After the blasting operation is completed, the abrasive 9 passes through the net 8 and accumulates in the hopper 10. When the abrasive 9 in the pressurized tank 12 is exhausted, the exhaust valve 14 is opened and the tank 1 is discharged through the filter 15 and the exhaust pipe 13.
Reduce internal pressure.

Next, when the supply port 17 is closed and the inside of the tank 12 reaches atmospheric pressure, the tap valve 11 is opened to allow the abrasive 9 to fall into the pressurized tank 12 again.

〔Effect of the invention〕

As described in detail above, the present invention injects one high-pressure air into the inner bottom of a pressurized tank, receives the abrasive along with the air from the mixing tube facing the inner bottom, and adjusts the concentration using the concentration adjustment mechanism. This sandblasting device supplies the other air into the mixed air flow and supplies it to the injection mechanism at an appropriate mixing ratio, so it has the advantage of being able to perform highly efficient sandblasting with stable quality and no unevenness in injection. . Furthermore, since it is possible to use an extremely narrow nozzle with a diameter of about 0.5 m/m, it has the special advantage of being suitable for fine machining for glasses, dentistry, and the like.

In this embodiment, the pressurized tank is a single unit, but it may be configured in two stages to enable continuous injection. Furthermore, although the abrasive was directly dropped into the pressurized tank, it may be collected in the pressurized tank after passing through a cyclone, a vibrating sieve, or the like.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, Fig. 1 is a partially cutaway perspective view showing the inside of the sandblasting device, Fig. 2 is an enlarged sectional view of the main part of the feeding device, and Fig. 3 is a conventional example. FIG. 2 is a partially cutaway sectional view. 1...Sandblasting room, 9...Abrasive, 4...
... Injection mechanism, 12 ... Pressurized tank, 16 ... Supply device, 17 ... High pressure air supply port, 21 ... Mixing pipe, 22 ... Concentration adjustment mechanism.

Claims (1)

[Claims] 1. A sandblasting chamber with an abrasive-mixed air injection mechanism, a pressurized tank disposed below the sandblasting chamber via a tap valve, and a transport pipe attached to the pressurized tank and connected to the injection mechanism. and a supply device for supplying abrasive mixed air through the pressurized tank, and the supply device includes a high-pressure air supply port that receives high-pressure air from outside the pressurized tank, and a lower opening that is continuous with the supply port and the transport pipe. Consisting of a mixing tube consisting of an inner tube and an outer tube, and a concentration adjustment mechanism interposed between the supply port and the inner tube, one of the high-pressure air pumped from the supply port is supplied from the gap between the inner tube and the outer tube. It squirts out and fluidizes the abrasive at the bottom of the tank.
A sandblasting device characterized in that the other of the high-pressure air is adjusted by a concentration adjustment mechanism to supply the abrasive at a proper mixing ratio.