Hydraulic apparatus based on confluence control mode
View Patent ↗A hydraulic apparatus based on a confluence control mode includes a load sensing unit provided with first and second reversing valves, and a throttle governing unit provided with a fourth reversing valve. A confluence valve and a one-way valve, which communicate with the load sensing unit and the throttle governing unit, are arranged on a parallel oil path arranged in parallel with the fourth reversing valve. The confluence valve includes a confluence channel that controls opening and closing of the parallel oil path to shunt fluid of the throttle governing unit to the load sensing unit. A first pilot pressure acting on the first reversing valve and a second pilot pressure acting on the second reversing valve act on the confluence valve independently or simultaneously to change a position of the confluence channel, thus implementing reversing of the confluence valve.
1. A hydraulic apparatus based on a confluence control mode, comprising a load sensing unit provided with a first reversing valve and a second reversing valve, and a throttle governing unit provided with a fourth reversing valve, wherein
a confluence valve and a one-way valve, which are communicated with the load sensing unit and the throttle governing unit, are arranged on a parallel oil path arranged in parallel with the fourth reversing valve,
the confluence valve is provided with a confluence channel that controls opening and closing of the parallel oil path to shunt fluid of the throttle governing unit to the load sensing unit,
a fourth executive element implements reversing of the confluence valve during action being connected to the fourth reversing valve, and
when the first reversing valve reverses due to a first pilot pressure thereof acting thereon, when the second reversing valve reverses due to a second pilot pressure thereof acting thereon, and when the fourth reversing valve reverses due to a fourth pilot pressure thereof acting thereon, the first pilot pressure and the second pilot pressure also act on the confluence valve independently or simultaneously to change a position of the confluence channel so as to implement reversing of the confluence valve,
the confluence channel comprises a large-liquid-resistance channel, a small-liquid-resistance channel and a breaking channel which controls opening and closing of the parallel oil path,
one end of the confluence valve is provided with a large end face synchronously receiving control by the first pilot pressure, and a small end face synchronously receiving control by the second pilot pressure,
the other end of the confluence valve is provided with a reconfigured spring, and
the fourth reversing valve receives control by the fourth pilot pressure and is connected in parallel with the confluence valve.
2. The hydraulic apparatus based on a confluence control mode according to claim 1 , wherein
the load sensing unit further comprises a constant power control valve, a variable displacement mechanism and a variable displacement piston pump,
the first reversing valve is respectively connected to a first compensation valve and a first executive element,
the second reversing valve is respectively connected to a second compensation valve and a second executive element; and
the throttle governing unit further comprises a gear pump coaxial with the variable displacement piston pump.
3. The hydraulic apparatus based on a confluence control mode according to claim 1 , wherein
a channel area of the breaking channel is zero, channel areas of the large-liquid-resistance channel and the small-liquid-resistance channel are non-zero, and the channel area of the large-liquid-resistance channel is larger than the channel area of the small-liquid-resistance channel.