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  Blasting apparatus for outer surface of pipeRelated Patent Categories: Abrading, Precision Device Or Process - Or With Condition Responsive Control, By Optical SensorThe Patent Description & Claims data below is from USPTO Patent Application 20080038990. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a blasting apparatus, and more particularly, relates to a Wasting apparatus for an outer surface of a pipe, which ejects a blast material to an outer surface of a pipe and grinds the outer surface of the pipe to perform surface preparation. [0003] 2. Description of the Related Art [0004] For example, a vent pipe (piping) placed inside a suppression chamber, which is a part of a nuclear reactor containment facility of an atomic power plant, has its outer peripheral surface and inner peripheral surface coated by recoating it with a plurality of coating materials excellent in corrosion resistance, decontaminability and the like. The repainting construction is carried out with about 10 years after the start of operation as a guide, and as a pre-construction of the repainting construction, grinding and decontaminating operations of grinding the coating film including radioactive substances on the outer peripheral surface and the inner peripheral surface and roughening the coated surface to perform surface preparation are performed. [0005] Conventionally, no apparatus for grinding and decontaminating the inner peripheral surface of a vent pipe is available, and grinding and decontaminating of only the outer peripheral surface is carried out by a blasting technique. The blasting technique is a technique of causing a blast material such as sand, and steel grit ejected by high speed air to collide against a substance to be treated, grinding the surface of the substance to be treated with the impact force to roughen the surface (for example, see Japanese Patent Application Laid-Open No. 9-109029). SUMMARY OF THE INVENTION [0006] However, since the sand blasting technique as described in the above described Japanese Patent Application Laid-Open No. 9-109029 adopts the method of a worker moving a blast ejection nozzle on a surface to be treated by gripping the blast ejection nozzle, it is inefficient, and has the problem in hygiene. [0007] Further, the worker performs an operation as he or she makes one round of a pipe, and there is the problem that when the pipe is laterally arranged, operability becomes extremely bad, and when the pipe is close to a wall surface even if it is vertically arranged, operability also degrades. [0008] The present invention is made in view of the above circumstances, and has an object to provide a blasting apparatus for an outer surface of a pipe, which is capable of efficiently grinding the outer surface of a pipe with excellent operability. [0009] In order to attain the above-described object, the invention according to a first aspect provides a blasting apparatus for an outer surface of a pipe, in 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, characterized by including a blast head containing a nozzle which ejects the blast material and a suction port which sucks a blast material used for grinding and dust particles, 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, and a ring member which is a ring member constructed by connecting at least two half-split members and having an inside diameter 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 tuning in the circumferential direction on the outer surface of the pipe. [0010] According to the invention described in the first aspect, the blast head containing the nozzle which ejects the blast material, and the suction port which sucks the blast material used for grinding and dust particles is guided along the longitudinal direction of the outer surface of the pipe by the guide member provided along the longitudinal direction of the outer surface of the pipe, and is guided along the circumferential direction of the outer surface of the pipe by the ring member which is disposed to have the pipe inserted through the ring member. Therefore, the blast head can be easily moved along the longitudinal direction and the circumferential direction of the outer surface of the pipe with a simple mechanism, and the blasting treatment of the outer surface of the pipe can be efficiently performed under the clean environment. [0011] Further, the ring member is constructed by the member which is divided into at least two, and therefore, the ring member is easily attached to and detached from the pipe. Operability at the time of changing setting in the longitudinal direction past the support portion which supports the pipe is especially excellent. [0012] In the invention of the first aspect, the invention according to a second aspect is characterized by further including 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, and in that the longitudinally driving device is constructed by 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 the circumferentially driving device is constructed by 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. [0013] According to the invention described in the second aspect, the longitudinally driving device having the one guide member and the one feed screw which is rotationally driven by the drive device, and the circumferentially driving device having the ring member, the large-diameter gear provided at the ring member, and the small-diameter gear which is rotationally driven by the drive device are provided, and therefore, the movement of the blast head in the longitudinal direction of the outer surface of the pipe and its movement in the circumferential direction can be automated with a simple mechanism. [0014] The invention according to a third aspect provides a blasting apparatus for an outer surface of a pipe, in 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, characterized by including a blast head containing a nozzle which ejects the blast material and a suction port which sucks a blast material used for grinding and dust particles, and in that the blast head is constructed by connecting at least two half-split members, formed into a ring shape having an inside diameter larger than an outside diameter of the pipe, and disposed to have the pipe inserted though the blast head, and a plurality of spherical rolling seats which abut on the outer surface of the pipe and guide the blast head movably in a longitudinal direction and a circumferential direction of the outer surface of the pipe are provided on the inside diameter side of the blast head. [0015] According to the invention described in the third aspect, the ring-shaped blast head disposed to have the pipe inserted through the blast head is provided with a plurality of spherical rolling seats which abut on the outer surface of the blast head, and therefore, the blast head can be moved along the longitudinal direction and the circumferential direction of the outer surface of the pipe with a simple structure. [0016] Since the blast head is constructed by the member which is divided into at least two, the blast head is easily attached to and detached from the pipe. Operability when setting is changed in the longitudinal direction past the support portion which supports the pipe is especially excellent. [0017] In the invention in the third aspect, the invention according to a fourth aspect is characterized by further including 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, and in that the longitudinally driving device is constructed by one feed screw provided parallel with the longitudinal direction of the outer surface of the pipe, a feed nut which is threadedly fitted onto the feed screw and connected to the blast head so as to restrain only movement of the blast head in the longitudinal direction of the outer surface of the pipe, and a drive device which rotationally drives the feed screw, and the circumferentially driving device is constructed by a large-diameter gear provided integrally with the blast head formed into the ring shape, a small-diameter gear which is meshed with the large-diameter gear held by the feed nut, and a drive device which rotationally drives the small-diameter gear. [0018] According to the invention described in the fourth aspect, the longitudinally driving device having the one feed screw which is rotationally driven by the driving device, and the circumferentially driving device having the large-diameter gear provided integrally with the blast head and the small-diameter gear rotationally driven by the air motor are provided, and therefore, the movement of the blast head in the longitudinally direction and its movement in the circumferential direction of the outer surface of the pipe can be automated. [0019] In the invention according to the invention of any one of the first, second, third and fourth aspects, the invention according to a fifth aspect is characterized by having 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. [0020] According to the invention described in the fifth aspect, the image of the base of the outer surface of the pipe after blasting can be picked up. Therefore, the rust removal degree and the ground state can be observed, the finished state can be recorded, and the finished state can be compared with a sample and automatically judged. [0021] In the invention of any one of the first, second, third, fourth and fifth aspects, the invention according to a sixth aspect is characterized in that the blast material is a blast medium in a sponge piece form in which abrasives are contained in a porous elastic body. [0022] According to the invention described in the sixth aspect, the blast medium in the sponge piece form in which the abrasives are contained in the porous elastic body is used as the blast material. When the blast medium collides against the outer surface of the pipe, the blast medium becomes flat, and the contained abrasives directly collide against the outer surface at a high speed. Therefore, the outer surface can be ground as in a sand blasting technique. The dust particles which float in the air in the ordinary sand blasting are taken into the sponge pieces and directly drop. Therefore, scattering of the dust particles can be significantly reduced, and the operation environment can be remarkably improved. Continue reading... Full patent description for Blasting apparatus for outer surface of pipe Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Blasting apparatus for outer surface of pipe patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. 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