Hydraulic oil cylinder and related equipments, hydraulic buffer system, excavator and concrete pump truck

摘要

A hydraulic oil cylinder has a buffer sleeve (4), a rodless cavity sealing end face (1-2) and at least one throttle oil channel (3-1). The buffer sleeve (4) is sleeved on an additional section (3a) of a piston rod in the rodless cavity (2-2) and axially slidable along the additional section (3a) of the piston rod. The rodless cavity sealing end face (1-2) is provided in an oil cylinder cavity between a rodless cavity oil passing hole (1-1) and the termination of the rodless cavity end face of the piston for the retraction process of the piston rod (3), and enables to block the buffer sleeve (4) and attach to the first end surface (4-1) of the buffer sleeve thereby forming a sealing surface. The hydraulic oil at the side of the sealing surface adjacent to the piston (6) can flow to the rodless cavity oil passing hole (1-1) via the throttle oil channel (3-1) when the piston (6) moves from the position, where the first end face (4-1) of the buffer sleeve is attached to the rodless cavity sealing end face (1-2) and the sealing surface is formed, to the position where the piston (6) retracts to the termination during the retraction process of the piston rod (3). The hydraulic oil cylinder has the advantages of simple machining of the buffer structure and good effects. A hydraulic buffer system, an excavator and a concrete pump truck with the above hydraulic oil cylinder are also disclosed.