DEVICE OF SLIP FORM HYDRAULIC JACK INCLUDING SAFETY DEVICE

摘要

The present invention relates to a slip-form hydraulic jack device having a safety device. The slip-form hydraulic jack device having a safety device comprises: a jack rod (10) which is vertically installed; a first hydraulic cylinder (20) which is installed on the outer side of the jack rod (10); a first grip jaw housing (30) which is installed on the outer side of the jack rod (10); a first grip jaw (40) which supports the first grip jaw housing (30) in a wedge type; a second grip jaw housing (50) which is fixed to the bottom of a first piston (22); a second grip jaw (60) which supports the second grip jaw housing (50) in a wedge type; a switch rod (70) which is vertically installed on the top of the second grip jaw (60); a switch pin (80) which is vertically fixed to the bottom of the first grip jaw (40); a third grip jaw housing (90) which is I in the bottom of the second grip jaw housing (50); a third grip jaw (100) which supports the third grip jaw housing (90) in a wedge type; and a second hydraulic cylinder (110) which allows the third grip jaw (100) to be coupled to the bottom of the third grip jaw housing (90) in a wedge type to press the jack rod (10). Thus, the present invention prevents the first hydraulic cylinder (20) from falling down from the jack rod (10).