Oil circuit for a cat.

摘要

Oil circuit of a jack to raise an object to a preset position rapidly comprising an input circuit oil circuit oil return, and a protection circuit overload, and the inner oil reservoir (1), the, wherein the input circuit oil external tank external oil tank (2), the pumping chamber of oil (3) and the piston rod (4) of a hydraulic cylinder (10) oil (2) the hydraulic cylinder (10) is connected to the pumping chamber of oil (3) through a check valve (A1), the pumping chamber of oil (3) passes through a sequential valve (B ) to communicate with the inner oil reservoir (1) of the hydraulic cylinder (10) and the outer oil reservoir (2) is connected to the inner oil reservoir (1) of the hydraulic cylinder (10) through a valve check (A3); in the circuit oil return, the inner oil reservoir (1) of the hydraulic cylinder (10) is connected to the inner oil chamber (41) of the piston rod (4) through a check valve (A4) then also it passes through an exhaust valve (C) to communicate with an external oil reservoir (2), when charging a load and then the jack returns to the original position, the exhaust valve (C) can be set to an escape position so that the circuit oil return is open, and the protection circuit overload, the outer oil reservoir (2) of the hydraulic cylinder (10) passes through a safety valve (D) to communicate with the pumping chamber of oil (3) when the pressure of the hydraulic cylinder (10) is above a predetermined pressure, the safety valve (D) is actuated so that the protection circuit is actuated overload; characterized in that: in the hydraulic loop above, the maximum effective oil storing chamber oil pump is greater than or equal to the maximum effective oil storing internal oil chamber in the piston rod, a channel common oil (31) is installed between the pumping chamber of oil (3), the inner oil chamber (41) of the piston rod (4) and the sequential valve (B), a check valve (A2) is installed between the oil channel (31) and the sequential valve (B), an oil channel (311) is installed between the sequential valve (B) and the check valve (A2) for connected to the inner oil chamber (41) of the piston rod (4) when in the working conditions of virtual load and light load, the sequential valve (B) is closed, thus, the hydraulic oil enters the inner oil chamber (41) d the piston rod (4) from the pumping chamber of oil (3) through the check valve (A2) so that the piston rod (4) will rise rapidly to a stationary condition, the condition stationary load, since the check valve (A2) closes the oil channel (31), the sequential valve (B) will open automatically so that the inner oil chamber (41) of the piston rod (4) communicates with the inner oil reservoir (1), thus the inner and outer oil pressures of the oil guiding tube (50) in the piston rod (4) are equal.