Patent ID: 8568200

Claim:
An ultra-low temperature magnetic polishing machine, comprising: a housing defining therein a grinding chamber; a door hinged to said housing and controllable to open/close said grinding chamber; a motor mounted inside said housing below said grinding chamber; a magnetic disc set in between said grinding chamber and said motor and rotatable by said motor, said magnetic disc having an N pole and a S pole for causing an alternative magnetic field in said grinding chamber during rotation of said magnetic disc by said motor; a freezer, said freezer comprising an output pipeline inserted into said grinding chamber, and freezing medium deliverable through said output pipeline into said grinding chamber; a container set in said grinding chamber; and a plurality of magnetically conductive grinding media put in said container; further comprising a temperature sensor installed in said grinding chamber, a temperature controller electrically connected with said temperature sensor, and a valve electrically connected with said temperature controller and mounted in said output pipeline and controllable by said temperature controller to close/open said output pipeline.