Quick coupler, method for operating a quick coupler and quick-change device

摘要

A quick coupler (16) for coupling a tool (12) provided with an adapter (18) to a work machine (14) on which the quick coupler (16) can be arranged, with a locking device (32) for producing a mechanical connection between the work machine (14 ) and tool (12), wherein the locking device (32) has at least one locking element (22, 24), which is acted upon by a spring force in the direction of a locking position, and a hydraulic piston (28) connected to the locking element (22, 24), which is slidably disposed in a cylinder (30) and divides the cylinder interior into an opening chamber (44) and a lock chamber (42), the opening chamber (44) being connected to a hydraulic valve (56) via a first hydraulic line (50) the opening chamber (44) and thus the hydraulic piston (28), if necessary, to be acted upon by hydraulic pressure so that the hydraulic piston (28) and with the hydraulic likkolben (28) connected locking element (22, 24) is moved from the locking position to an opening position against the spring force, wherein the locking chamber (42) with a second hydraulic line (46) is connected, and with hydraulic oil, if necessary acted upon, characterized in that the first hydraulic line (50) and the second hydraulic line (46) are short-circuited via a connecting line (54) and connected via a single hydraulic supply line (48) to a hydraulic valve (56), and in that in the second hydraulic line (46) Return flow from the locking chamber (42) locking further valve (52) is arranged, so that during the movement of the locking element (22, 24) and thus the hydraulic piston (28) from the locking position to the open position at least a portion of the hydraulic force in the locking chamber (42) generating hydraulic oil via the with the locking chamber (42) connected second hydraulic line (46), via the further valve (52), via the connecting line (54) and the first hydraulic line (50) to the opening chamber (44) flows.