The present invention relates to a hydraulic clamp apparatus for an extension screw rod installed on an upper part of a lower auger for a ground excavator which lifts along a guide bar of a leader of a crawler crane, comprising: an hydraulic clamp body installed to be able to slide at the guide bar, having two guide holes penetrated in a straight line formed on each of hydraulic clamp body frames which lift along the guide bar and face each other, and having a square shape of which the upper and lower parts are open, wherein two pressurizing throttling plates are configured to face each other towards the center of the hydraulic clamp body, a facing surface is formed as a curve, and protraction portions of both sides of the pressurizing throttling plate are inserted into and protrude from each of the guide grooves; the two pressurizing throttling plates configured to face each other towards the center of the hydraulic clamp body, wherein the facing surface is formed in a curve, and the pressurizing throttling plates are formed in a plate type including the protraction portions of both sides of the pressurizing throttling plate, inserted into and protruding from each of guide grooves, and is moved in the guide groove; and a rod hydraulic device including a throttling plate hydraulic cylinder rod and two throttling plate hydraulic cylinders hinge-coupled to the pressurizing throttling plates and operated with oil pressure of the crawler crane. Therefore, the hydraulic clamp apparatus for the extension screw rod is able to slide while facing the two pressurizing throttling plates and is commonly used regardless of the size of the diameter of the extension screw rod, and does not generate eccentric virtual pressure at the same time. The pressurizing throttling plate slides into the guide groove, and therefore, the direction of the virtual pressure is the same all the time. The entire length of the gear part and lower auger hydraulic device having a sickle-shaped rack are reduced.
CLAMP APPARATUS OF OIL PRESSURE FOR EXTENSION SCREW LOD
16.09.2015
Patent
Elektronische Ressource
Koreanisch
CLAMP APPARATUS OF OIL PRESSURE FOR EXTENSION SCREW LOD
Europäisches Patentamt | 2015
NTRS | 1982
|