CRANE AND COUNTERWEIGHT LOADING AND UNLOADING MECHANISM FOR CRANE, COUNTERWEIGHT BLOCK

摘要

Disclosed is a counterweight loading and unloading mechanism for a crane. The counterweight loading and unloading mechanism (10) comprises: two jibs (11, 11'), symmetrically disposed at two sides of a slewing platform (30) of the crane, a first end (111) of each jib being pivotably connected on the slewing platform of the crane, a second end (113) extending outwardly at the tail of the slewing platform and having a latch hook (115); two counterweight cylinders (13, 13'), symmetrically disposed at two sides of the slewing platform of the crane, and driving the jibs to rotate between the installation position (P1) and a placement position (P2) of a counterweight block; and a locking device, disposed at the tail of the slewing platform of the crane and along the width direction of the slewing platform of the crane, the latch hook and the counterweight block being connected detachably through a latch bar, and the latch bar locking and fitting the counterweight block when the counterweight block is at the installation position. Further disclosed are a crane having the counterweight loading and unloading mechanism and a counterweight block fitting the counterweight loading and unloading mechanism. The counterweight loading and unloading mechanism is capable of avoiding offset loading of the cylinder piston rod incurred when the two cylinders are asynchronous, which is very suitable for horizontal arrangement of counterweight cylinders and facilitates the adjustment of horizontal posture of the counterweight block.