Patent ID: 6863601

Claim:
A sand-belt finishing machine, comprising: a main frame; at least one grinding belt device located above the main frame; a conveyor platform mounted between the grinding belt device and the main frame; a lift device mounted between the conveyor platform and the main frame for adjusting a position of the conveyor platform, wherein the lift device includes: a propeller shaft mounted in the main frame and having a first end provided with a beveled gear; a driven shaft having a first end secured on a bottom face of the conveyor platform and a second end extended through the main frame; a support plate having a first end secured on the second end of the driven shaft and a second end provided with a threaded sleeve which has an inside formed with a screw bore; a driving rod engaged in the screw bore of the threaded sleeve and having a distal end provided with a beveled gear meshing with the beveled gear of the propeller shaft; and a slide rod having a first end secured on the bottom face of the conveyor platform and a second end extended through the main frame.