Rotary upper mold rapid-replacement device of middle-small hydraulic press slipper

The invention relates to a rapid changing device for a rotary upper die of medium and small sized hydraulic press slides, and the rapid changing device comprises a die holder arranged on a slide, the lower end of the die holder is provided with an arc inverted retainer edge and a die block for arranging the upper die, the upper end of the die block is provided with an outward protruding ring table, the edge of the ring table is clamped in the arc inverted retainer edge, a magnetism isolating sleeve is inserted in the lower end of the die holder, the internal part of the magnetism isolating sleeve is provided with a magnetic block, the upper surface of the ring table and the lower end face of the die holder are planes and mutually jointed with each other under the magnetic force effect of the magnet, a locating pin is inserted between the die holder and block; a spring hole is arranged on the lower end face of the die holder, a spring pin is arranged in the spring hole, the side wall of the die holder is provi