Magnetic induced shrinkage or elongation burnishing device of double stick structure

The utility model relates to a magnetic induced shrinkage or elongation burnishing device of double stick structure, the device's constitution includes: rubbing head, octahedra yoke, magnetostrictive rod, bar -shaped yoke, coil and base, the boss that two magnetostrictive rod pass through the lower part is fixed respectively in the recess on base both sides, and bar -shaped yoke is passed through the boss of lower part and is fixed in the recess in the middle of the base, the boss that two magnetostrictive rod pass through upper portion is fixed respectively in the recess on octahedra yoke bottom both sides, and bar -shaped yoke is passed through the boss on upper portion and is fixed in the recess in the middle of the octahedra yoke bottom, downthehole in octahedra magnetism yoke end portion is fixed through threaded connection to the axle of rubbing head bottom. The utility model has the advantages of small, simple structure, convenient to use, at frequency of operation 0 2kHz's within range, is radial ampl