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US 2021/0229962 A1Published application
Crane hydraulic system and controlling method of the system
OwnerZenghai Shan, Xiaodong Hu +3inventors
InventorsZenghai Shan, Xiaodong Hu, Guowang Jiao, Bin Zhou, Conglin Yuan
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Abstract
A crane hydraulic system and a controlling method of the system is provided in order to fundamentally reduce impact in start and stop operations of a load sensing winch system. The load sensing subsystem is arranged, at the start and stop moments of a winch system, the pressure compensator can be opened, and the variable pump oil inlet line communicates with the oil return line to realize pressure relief, so as to reduce the pressure impact.
Claims19
A crane hydraulic system comprising:
- a confluence control subsystem, wherein the confluence control subsystem comprises:
- a solenoid valve, a shuttle valve, a hydraulic operated reversing valve and a confluence valve;
- wherein an oil inlet of the solenoid valve communicates with a control pressure source, a first oil inlet of the shuttle valve communicates with a working oil port of the hydraulic operated reversing valve, a second oil inlet of the shuttle valve communicates with a working oil port of the solenoid valve, an oil outlet of the shuttle valve communicates with a control port of the confluence valve, a hydraulic operated port of the hydraulic operated reversing valve communicates with at least one first load pressure source, an oil inlet of the hydraulic operated reversing valve communicates with at least one second load pressure source, a first oil port of the confluence valve communicates with a first main pump, and a second oil port of the confluence valve communicates with a second main pump;
- in a state where the solenoid valve is energized, the oil inlet of the solenoid valve is configured to communicate with the working oil port, and in a state where the solenoid valve is de-energized, the working oil port of the solenoid valve is configured to communicate with an oil return port;
- in a state where the hydraulic operated reversing valve reverses through the hydraulic operated port, the oil inlet of the hydraulic operated reversing valve is configured to communicate with the working oil port of the hydraulic operated reversing valve, and in a state where the hydraulic operated reversing valve resets, the working oil port of the hydraulic operated reversing valve is configured to communicate with the oil return port.
2 more elements
A crane hydraulic system comprising:
- a crane derricking subsystem, wherein the crane derricking subsystem comprises a derricking cylinder and a cylinder down control valve, the cylinder down control valve comprises a balance valve and a reversing valve;
- wherein a first oil port and a second oil port are provided in the balance valve, and the first oil port is connected with an oil port of the reversing valve;
- in a first working state of the balance valve, an oil passage between the first oil port and the second oil port is configured to be communicated from the first oil port to the second oil port and disconnected from the second oil port to the first oil port;
- in a second working state of the balance valve, the oil passage between the first oil port and the second oil port is configured to be communicated from the second oil port to the first oil port;
- and
- a rod cavity of the derricking cylinder is in communication with another oil port of the reversing valve, and a rodless cavity of the derricking cylinder is in communication with the second oil port of the balance valve.
3 more elements
A crane hydraulic system comprising:
- a composite action control subsystem, wherein the composite action control subsystem comprises:
- a first proportional reversing valve, a second proportional reversing valve, a first control solenoid valve, a second control solenoid valve, a third control solenoid valve and a fourth control solenoid valve;
- wherein the first proportional reversing valve comprises a first control oil port that communicates with the working oil port of the first control solenoid valve and a second control oil port that communicates with the working oil port of the fourth control solenoid valve, the working oil port of the first proportional reversing valve communicates with a first executive element, the oil inlet of the first proportional reversing valve communicates with a oil pump, and the oil outlet of the first proportional reversing valve communicates with the oil tank;
- the first control oil port of the second proportional reversing valve communicates with the working oil port of the second control solenoid valve, the second control oil port of the second proportional reversing valve communicates with the working oil port of the third control solenoid valve, the working oil port of the second proportional reversing valve communicates with a second executive element, the oil inlet of the second proportional reversing valve communicates with the oil pump, and the oil outlet of the second proportional reversing valve communicates with the oil tank;
- the oil inlets of the first control solenoid valve and the third control solenoid valve communicate with a first output oil passage of the handle, and the oil inlets of the second control solenoid valve and the fourth control solenoid valve communicate with a second output oil passage of the handle;
- and
- the oil return ports of the first control solenoid valve, the second control solenoid valve, the third control solenoid valve and the fourth control solenoid valve communicate with the oil tank.
4 more elements
Dependencies are inferred from the claim text.