The subject innovation is, more specifically, by rotating the pidomul predetermined period by performing the division sanding in a continuous process at intervals spar of improving the grinding quality of pidomul and sanding relates to a sanding device for the surface treatment of the outer surface of the various pidomul It relates to a sanding apparatus for the surface treatment of pidomul to reduce the consumption of sand.
Sanding device for the surface treatment of pidomul according to the present invention is provided with one or more jig disposed at equal intervals on the rotary table to rotate in the location in the body, and based on the central axis, the rotating table top, is fixed on the jig grinding by comprising a plurality of grinding gun and one or more pidomul that object, which the high-pressure jet of sand to a sanding process the pidomul, and the jig and pidomul the quantity of pidomul (n, n is an even number) 1 / (n / 2), and rotational movement with a pitch units, wherein each of the plurality of sanding gun is provided in a direction opposite to each position of the jig and pidomul positioned spaced apart by 1 / (n / 2) pitch unit, the jig and pidomul the m / (n / 2) when the rotational movement (m is a positive integer) pitch position, the sanding there.But opposite to that location is implemented to the high pressure jet of sand.