Abrading – Precision device or process - or with condition responsive... – Condition responsive control for sandblasting
Patent
1995-12-21
1998-09-01
Eley, Timothy V.
Abrading
Precision device or process - or with condition responsive...
Condition responsive control for sandblasting
451 38, 451 60, 451 88, 451100, 451446, B24C 100, B24C 304, B24C 700
Patent
active
058002464
DESCRIPTION:
BRIEF SUMMARY
FILED OF THE INVENTION
The present invention relates to a blasting apparatus, and in particular relates to a pressure tank apparatus for supplying particles in an ejection portion of a blasting apparatus. Further, the present invention is also directed to a method of switching the pressure tank apparatus, a particle supply valve which opens or closes to respectively create or terminate a flow of particles and compressed air to a nozzle of a blasting apparatus, and a particle separator that extracts only reusable particles from a mixture of used particles and dust which have been produced during the blasting process.
BACKGROUND ART
In the conventional blasting apparatuses, a pressure tank apparatus that supplies particles to an ejection portion is constructed from a pressure tank as shown in FIG. 6, which is so called as a single direct-pressure type. In the drawing, the reference numeral 51 denotes such a pressure tank. On the pressure tank 51, there is provided a hopper 52. Between the pressure tank 51 and the hopper 52, there is provided a particle supply valve 56. The particle supply valve 56 is a pressure type shutoff valve which opens and closes automatically in accordance with the internal pressure of the pressure tank 51.
Further, connected to the top portion of the pressure tank 51 are an air supply pipe 55, which supplies air for the purpose of pressurizing the inside of the pressure tank 51, and an exhaust pipe 58 which exhausts the pressurized air within the pressure tank 51. For performing these functions, the air supply pipe 55 is provided with an air supply valve 54, and the exhaust pipe 58 is provided with an air release valve 57.
Connected to the bottom portion of the pressure tank 51 is a delivery pipe 60 for delivering compressed air and particles to a nozzle (not shown in the drawing). A particle supply valve 59 is provided in the delivery pipe 60. In the drawing, the reference numeral 53 denotes particles accumulated within the pressure tank 51.
Now, when the above described conventional blasting apparatus is to be used, first a prescribed amount of particles are supplied to the pressure tank 51 from the hopper 52. Then, the exhaust valve 57 is closed and the air supply valve 55 is opened to allow compressed air to pass into the pressure tank 51, whereby the pressure inside the pressure tank 51 is to be risen. As soon as the pressure inside the pressure tank 51 reaches a prescribed level, the particle supply valve 56 automatically closes, thus stopping the flow of particles 53 from the hopper 52 to the pressure tank 51 and, at the same time, preventing pressurized air from leaking into the hopper 52 from the pressure tank 51. Then, when a blasting operation is to be carried out, the particle supply valve 59 is opened to allow compressed air and particles to be delivered to the nozzle.
However, in the conventional blasting apparatuses, when all the particles 53 have been used up in the course of carrying out a blasting operation, the blasting operation must be suspended temporarily in order to refill the pressure tank 51 with new particles 53. Namely, in the refilling operation, the air supply valve 54 must first be closed to stop the flow of compressed air into the pressure tank 51 after the blasting operation has been suspended. At the same time, the exhaust valve 57 must be opened to exhaust pressurized air out of the pressure tank 51. Then, when the pressure inside the pressure tank 51 reaches a pressure that is roughly equal to the atmospheric pressure, the particle supply valve 56 automatically opens, which then allows particles 53 to flow into the pressure tank 51 from the hopper 52. Consequently, in the conventional blasting apparatuses, a great deal of time and many tedious operations are required for refilling the pressure tank 51, and therefore blasting operation must be suspended at each refilling operation. For this reason, there is a problem in that it is impossible to carry out a continuous blasting operation with such conventional blasting apparatuses.
In order to red
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patent: 2810991 (1957-10-01), Mead et al.
patent: 4984397 (1991-01-01), Van Leeuwen
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Microfilm of the spec. and drawings annexed to written appln. JP 62296/1988, Nov. 21, 1989, line 14, p. 8 to line 5, p. 9.
Microfilm of the spec. and drawings annexed to written appln. JP 22807/1973, Oct. 29, 1974, line 21, p. 2 to line 9, p. 3.
Microfilm of the spec. and drawings annexec to written appln. JP 94064/1990, Jul. 26, 1990, line 3, p. 5 to line 16, p. 7.
Eley Timothy V.
Rich Hill, Inc.
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