Hydraulic Oil Cylinder and Related Equipments, Hydraulic Buffer System, Excavator and Concrete Pump Truck

A hydraulic oil cylinder, wherein a buffer sleeve is axially slidably sleeved on a piston rod additional section located in a rodless cavity, and an end surface of the buffer sleeve facing a bottom of a cylinder barrel is a first end surface of the buffer sleeve;

• a rodless cavity sealing end surface is provided in an oil cylinder cavity between a rodless cavity oil-passing hole and an end position of a rodless cavity end surface of the piston in a retraction movement of the piston rod, and is configured to block the buffer sleeve and to abut against the first end surface of the buffer sleeve so as to form a sealing surface;
• and
• at least one throttling oil channel is further provided, such that during the retraction movement process of the piston rod, the hydraulic oil at a side of the sealing surface close to the piston can flow towards the rodless cavity oil-passing hole through the throttling oil channel in a period from a time when the first end surface of the buffer sleeve abuts against the rodless cavity sealing end surface to form the sealing surface to a time when the piston is retracted to an end position of the retraction movement.