Hydraulic Oil Cylinder, Correlative Device Thereof, Hydraulic Cushion System, Excavator And Concrete Pump Truck

Abstract

A hydraulic oil cylinder has a cushion collar, which is sleeved in the cushion position of a piston rod and can axially slide along the piston rod. In the oil cylinder cavity between an oil hole of the rod cavity and the terminal position of the piston end surface of the rod cavity during the piston extending movement, a sealing end surface of the rod cavity is provided, which can block the cushion collar and contact with the first end surface of the cushion collar to form a sealing surface. At least a throttle oil channel is provided between the cushion collar and the piston rod.

1 . A hydraulic oil cylinder, comprising:
 a buffer sleeve being able to axially slide along a piston rod is sleeved on a buffer position, located in a rod cavity, of the piston rod, and an end surface of the buffer sleeve away from a piston is a first end surface of the buffer sleeve;   a rod cavity sealing end surface is provided in an oil cylinder cavity between a rod cavity oil-passing hole and an end position of a rod cavity end surface of the piston in an extending 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 extending movement process of the piston rod, the hydraulic oil at a side of the sealing surface close to the piston can flow towards the rod 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 rod cavity sealing end surface to form the sealing surface to a time when the piston reaches an end position of the extending movement.   
     
     
         2 . The hydraulic oil cylinder according to  claim 1 , wherein the throttling oil channel is provided axially and linearly between the piston rod and the buffer sleeve; an end of the throttling oil channel close to the piston is a first end, the other end of the throttling oil channel close to the rod cavity oil-passing hole is a second end, and a cross-sectional area of the throttling oil channel is increased gradually from the first end to the second end. 
     
     
         3 . (canceled) 
     
     
         4 . The hydraulic oil cylinder according to  claim 1 , wherein in the case that the piston rod is extended to a stroke end position, there is a distance between the buffer sleeve and an end point of the sliding movement of the buffer sleeve towards the piston. 
     
     
         5 . The hydraulic oil cylinder according to  claim 1 , wherein in the case that the first end surface of the buffer sleeve contacts the rod cavity sealing end surface to form the sealing surface, an area of an axial action, applied on the buffer sleeve by the hydraulic oil at a side of the sealing surface close to the piston, is greater than an area of an axial action, applied on the buffer sleeve by the hydraulic oil at the other side of the sealing surface close to the rod cavity oil-passing hole. 
     
     
         6 . The hydraulic oil cylinder according to  claim 1 , wherein the piston rod is provided with a buffer position stop shoulder, and in the case that the buffer sleeve is not blocked by the rod cavity sealing end surface, the first end surface of the buffer sleeve is pressed against the buffer position stop shoulder under the action of an elastic member having elasticity. 
     
     
         7 . The hydraulic oil cylinder according to  claim 1 , wherein a piston stop shoulder is provided at the end position of the extending movement of the piston rod, for allowing the buffer sleeve to pass through and stopping the piston at the end position. 
     
     
         8 . (canceled) 
     
     
         9 . The hydraulic oil cylinder according to  claim 1 , wherein a main body of the throttling oil channel is a throttling groove arranged axially and linearly on a surface of the piston rod. 
     
     
         10 . The hydraulic oil cylinder according to  claim 9 , wherein in the case that the buffer sleeve is blocked by the rod cavity sealing end surface and slides relatively towards the piston on the piston rod, a flow sectional area of the throttling groove is reduced accordingly. 
     
     
         11 . The hydraulic oil cylinder according to  claim 9 , wherein the piston rod is provided with a buffer position stop shoulder, and an oil-passing groove is arranged on the buffer position stop shoulder at a position corresponding to an end point of the throttling groove. 
     
     
         12 . The hydraulic oil cylinder according to  claim 1 , wherein one or a plurality of annular grooves functioning as balancing grooves are provided on an outer surface of the buffer position of the piston rod, or on an inner diameter surface of the buffer sleeve, and a cross section of the annular groove is V-shaped, U-shaped, square or other forms. 
     
     
         13 . The hydraulic oil cylinder according to  claim 1 , wherein the throttling oil channel comprises two sections, a front section close to the piston and a rear section close to the rod cavity oil-passing hole; a main body of the front section is a throttling groove axially provided on a surface of the piston rod, and a main body of the rear section is a hidden oil channel extending axially in the piston rod. 
     
     
         14 . The hydraulic oil cylinder according to  claim 1 , wherein the throttling oil channel comprises a hidden oil channel extending axially in the piston rod and a plurality of throttling oil holes communicating a surface of the piston rod with the hidden oil channel, the throttling oil holes are axially distributed on the surface of the piston rod, and the closer the throttling oil hole is to an outlet of the hidden oil channel, the larger the hole diameter of the throttling oil hole becomes. 
     
     
         15 . The hydraulic oil cylinder according to  claim 1 , wherein a main body of the throttling oil channel is a chamfered surface axially arranged on a surface of the piston rod. 
     
     
         16 . The hydraulic oil cylinder according to  claim 1 , wherein a transition sleeve cooperating with the piston rod is sleeved on the buffer position, and the throttling oil channel is arranged on the transition sleeve; one or a plurality of annular grooves functioning as balancing grooves are provided on a transition sleeve, and a cross section of the annular groove is V-shaped, U-shaped, square or other forms. 
     
     
         17 - 23 . (canceled) 
     
     
         24 . A hydraulic buffer system, comprising the hydraulic oil cylinder according to  claim 1 . 
     
     
         25 . An excavator, comprising the hydraulic oil cylinder according to  claim 1 . 
     
     
         26 . (canceled)