Patent ID: 8251779

Claim:
A grinding device, comprising: a fixed barrel defining a first chamber therein and comprising a plurality of sidewalls, the sidewalls being substantially parallel to an axis of the fixed barrel, an inner face of each of the sidewalls defining a holding groove therein for holding a workpiece; a rotatable barrel received in the first chamber and comprising two first outer sides, each of the first outer sides being substantially parallel to the axis and defining an installation groove; a grinding plate installed in each of the installation grooves; an actuator operatively connected to the rotatable barrel to drive the rotatable barrel to rotate and simultaneously move up and down in the first chamber such that the grinding plates contact surfaces of the workpieces and grind the surfaces of the workpieces into desired arc shapes; and a cleaning assembly comprising a housing and a pipe, the housing defining a receiving chamber, the housing comprising a top on which the fixed barrel is fixed and at least one peripheral sidewall, the top defining a first opening via which the receiving chamber communicates with the first chamber, at least one sidewall of the at least one sidewall defining a second opening, the pipe extending from said at least one sidewall of the at least one sidewall such that the pipe communicates with the receiving chamber, and the pipe capable of conveying liquid into the receiving chamber and the first chamber to clean the workpieces.