Patent ID: 7695350

Claim:
An apparatus for supplying a constant amount of abrasives to a blasting gun of a blasting machine that ejects a mixed fluid composed of a compressed gas and the abrasives supplied from an abrasive tank for storing the abrasives, comprising: a supply channel for a transport air flow in a casing of the tank, the supply channel communicating with an external compressed-gas supply source; a transport path for the abrasives, communicating with the supply channel, the transport path having one end thereof communicating with the supply channel and the other end thereof communicating with the blasting gun; a rotating disc in the casing, wherein the rotating disc is entirely embedded within the abrasives stored in a space separated from the supply channel and the transport path; the rotating disc rotationally passes through an abrasive retrieve section defined as an opening formed between the supply channel and the transport path; and the rotating disc includes a plurality of measuring holes formed at regular intervals along a circumferential direction thereof such that the plurality of measuring holes pass through the disk in a thickness direction of the rotating disk, the plurality of measuring holes being disposed on a rotation orbit so as to allow the supply channel to communicate with the transport path through the retrieve section as the rotating disc rotates; and an introduction path for compressed gas passing through a bottom surface of the casing, wherein one of two ends of the introduction path communicates with the compressed-gas supply source outside the casing of the tank, and the other of said two ends of the introduction path opens in a rotation orbit direction of the measuring holes at a position except the retrieve section, which is a section including the transport path.