Blasting apparatus for outer surface of pipe

1. A blasting apparatus for an outer surface of a pipe which ejects a blast material to an outer side of a pipe and grinds the outer surface comprising:

a guide member which is provided along a longitudinal direction of the outer surface of the pipe, and guides the blast head along the longitudinal direction of the outer surface of the pipe;

a ring member formed of at least two connected half-split members and having an inside diameter that is larger than an outside diameter of the pipe, and which is disposed to have the pipe inserted through the ring member, holds the guide member, and guides the blast head in a circumferential direction of the outer surface of the pipe by turning in the circumferential direction on the outer surface of the pipe; and

a blast heat containing a suction port which sucks in a blast material for use in grinding and dust particles, and a nozzle which ejects the blast material,

wherein the blast head is mounted for movement in longitudinal and circumferential directions of the pipe.

2. The blasting apparatus for an outer surface of a pipe according to claim 1 , further comprising:

a longitudinally driving device which moves the blast head along the longitudinal direction of the outer surface of the pipe; and

a circumferentially driving device which moves the blast head along the circumferential direction of the outer surface of the pipe,

wherein the longitudinally driving device comprises one guide member, one feed screw provided parallel with the one guide member, a nut which is threadedly fitted onto the feed screw and connected to the blast head, and a drive device which rotationally drives the feed screw, and

wherein the circumferentially driving device comprises the ring member, a large-diameter gear provided integrally with the ring member, a small-diameter gear which is meshed with the large-diameter gear, and a drive device which rotationally drives the small-diameter gear.

3. The blasting apparatus for an outer surface of a pipe according to claim 2 , further comprising:

an illuminating device which illuminates a base of the outer surface of the pipe ground by the blast material; and

an image pickup device which picks up an image of the base of the outer surface of the pipe illuminated by the illuminating device.

4. The blasting apparatus for an outer surface of a pipe according to claim 3 ,

wherein the blast material is a blast medium in a sponge piece form in which abrasives are contained in a porous elastic body.

5. The blasting apparatus for an outer surface of a pipe according to claim 2 ,

wherein the blast material is a blast medium in a sponge piece form in which abrasives are contained in a porous elastic body.

6. The blasting apparatus for an outer surface of a pipe according to claim 1 , further comprising:

an illuminating device which illuminates a base of the outer surface of the pipe ground by the blast material; and

an image pickup device which picks up an image of the base of the outer surface of the pipe illuminated by the illuminating device.

7. The blasting apparatus for an outer surface of a pipe according to claim 6 ,

wherein the blast material is a blast medium in a sponge piece form in which abrasives are contained in a porous elastic body.

8. The blasting apparatus for an outer surface of a pipe according to claim 1 ,

wherein the blast material is a blast medium in a sponge piece form in which abrasives are contained in a porous elastic body.