Aerial Work Platform Floating Hydraulics With Accumulator Standby Pressure
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Solution Overview
Problem
Existing floating hydraulic control systems in aerial work platforms suffer from high power loss and low reliability due to the continuous need for standby working pressure and reliance on electrical signals and solenoid valves.
Innovation Solution
A floating control system that includes a driving mechanism, hydraulic oil tank, variable displacement pump, floating control valve, floating mechanism, boom function valve, actuator, and accumulator, which allows for intermittent energy charging and automatic energy storage in the accumulator, reducing energy consumption and enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a load-sensitive variable displacement pump is used to continuously provide standby working pressure for the floating mechanism, then the floating function can be reliably activated, but high power loss occurs due to continuous high-pressure output
Solution Approach 1:
The pump operates intermittently rather than continuously. The control system activates the pump only when the accumulator pressure drops below the standby working pressure threshold, eliminating continuous high-pressure operation and reducing power loss while maintaining floating reliability
Solution Approach 2:
The accumulator is pre-charged with hydraulic oil at standby working pressure before floating operation is needed. This preliminary energy storage allows the system to maintain floating capability without requiring the pump to continuously generate high pressure
2Ease of operation
If electrical signals and solenoid valves are used to control the floating function, then the system can be easily operated, but reliability decreases due to dependence on electrical components
Solution Approach 1:
The system uses the hydraulic system itself to control the pump operation. When the accumulator pressure drops, the hydraulic feedback automatically triggers the pump to recharge, eliminating dependence on electrical signals and solenoid valves while maintaining ease of operation
Solution Approach 2:
The electrical control system is replaced with a purely hydraulic control mechanism. The pump operation is controlled by hydraulic pressure feedback and mechanical switches rather than electrical signals, improving reliability by eliminating vulnerable electrical components
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system significantly reduces energy consumption by eliminating the need for continuous high-pressure output from the pump, enhances reliability by eliminating the reliance on solenoid valves, and provides a stable standby pressure for the floating mechanism, improving the endurance and safety of electric aerial work platforms.
Implementation Method 1
the system further comprises an accumulator, and the floating control valve comprises a first one-way valve, a second one-way valve, a pressure reducing valve, and a logic valve; and an oil inlet of the first one-way valve serves as the oil inlet of the floating control valve, an oil outlet of the first one-way valve is connected to a pipeline connecting the accumulator
Implementation Method 2
an oil outlet of the first one-way valve is connected to a pipeline connecting the accumulator
Data Source
AI summary
An aerial work platform and a floating control system thereof, the system comprising a driving mechanism, a hydraulic oil tank, a hydraulic pump, a floating control valve, a floating mechanism, a boom function valve, an actuator, and an accumulator: the floating control valve comprises a first one-way valve, a second one-way valve, a pressure reducing valve, and a logic valve; and an oil inlet of the first one-way valve serves as the oil inlet of the floating control valve, an oil outlet of the first one-way valve is connected to a pipeline connecting the accumulator, the pressure reducing valve and the logic valve, the logic valve is connected to the second one-way valve, an oil outlet of the second one-way valve serves as the feedback oil port of the floating control valve, when the hydraulic pump is a variable displacement pump, a feedback oil port of the floating control valve and a feedback oil port of the boom function valve are connected to a feedback oil port of the variable displacement pump; when the hydraulic pump is a fixed displacement pump, a feedback oil port of the floating control valve is connected to a feedback oil port of the boom function valve. The invention can reduce the power loss and improve the reliability of the system.