Abrading – Machine – Sandblast
Patent
1997-05-06
1999-05-18
Rose, Robert A.
Abrading
Machine
Sandblast
451351, 451354, 451 36, B24C3/06
Patent
active
059046120
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a surface treating device capable of removing foreign matter, such as an old coating or rust, stuck onto the surface of an object, or of roughening the surface of an object, by ejecting a high pressure fluid such as water, or a high pressure fluid mixed with abrasives, toward the surface of the object.
The present invention also relates to a surface treating device capable of removing foreign matter, such as an old coating or rust, stuck onto the surface of an object, or of roughening the surface of an object, by ejecting a high pressure fluid such as water or a high pressure fluid mixed with abrasives, toward the surface of the object, while suction-adhering to the surface of the object by the pressure of an ambient fluid such as air or water and moving along the surface.
BACKGROUND ART
So far, ultrahigh pressure water jetting equipment and sand blasting equipment have been put to practical use as surface treating devices which eject a high pressure fluid such as water or a high pressure fluid mixed with abrasives, toward the surface of an object such as an oil storage tank or a ship hull, thereby removing foreign matter such as an old coating or rust, stuck onto the surface of the object, or roughening the surface of the object with the abrasives ejected, to make the surface ready for coating; or a device for cleaning the surface of the object to carry out non-destructive testing.
In Japanese Patent Publication No. 26752/1985 and the specification and drawings of U.S. Pat. No. 4,095,378, there is disclosed devices which can be exemplified as a surface treating device which ejects a high pressure fluid such as water or a high pressure fluid mixed with abrasives, toward the surface of an object while suction-adhering to the surface of the object by the pressure of an ambient fluid such as air or water and moving along the surface, thereby removing foreign matter, such as an old coating or rust, stuck onto the surface of the object, or roughening the surface of the object with the abrasives ejected, to make the surface ready for coating; or a device for cleaning the surface of the object to carry out non-destructive testing.
Such a device comprises a blasting case, wheels as moving means mounted on the blasting case, a suction-adhering seal connected to the blast case and having its free end portion adapted to make contact with a surface of the object, and a pressure reduction means for discharging a fluid from a pressure reduction space defined by the blasting case, the surface of the object and the suction-adhering seal.
When the pressure reduction means is energized in this device, the fluid within the pressure reduction space is discharged outside, and the pressure of the fluid acting on the blasting case of the device owing to the difference in fluid pressure between the inside and the outside of the pressure reduction space is transmitted to the surface of the object via the wheels, and the fluid pressure causes the device to suction-adhere to the surface.
When, in this suction-adhering state, the wheels are rotated by driving means such as an electric motor, the device moves along the surface of the device by the action of the wheels.
Further, such a device is provided with a working unit of an abrasives-blasting means such as a nozzle which ejects abrasives to the surface of the object.
In conventional abrasives-blasting equipment using compressed air, a mixed fluid which is composed of about 13 m.sup.3 /min. of compressed air pressurized to about 6 kg/cm.sup.2 and about 35 kg/min. of non-steel abrasives is ejected from a nozzle with a diameter of about 15 mm, the nozzle is swung at a swing angle of from about 60 degrees to about 90 degrees to treat by abrasives about 400 mm in width on the surface of the object, and further, the swung nozzle is gradually moved in the direction which intersects at right angles with the swing direction along the surface of the object at a rate of about 1.8 m/min. Thus, the surface is treated continuously.
The conventional
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patent: 4095378 (1978-06-01), Urakami
patent: 4934475 (1990-06-01), Urakami
patent: 4997052 (1991-03-01), Urakami
patent: 5536199 (1996-07-01), Urakami
Nguyen George
Rose Robert A.
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