Boom Retraction Speed Control Using Gravity and Hydraulic Pressure
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Solution Overview
Problem
Existing technologies fail to ensure controllable speed of boom retraction in aerial work platforms, leading to inefficient energy consumption.
Innovation Solution
A control method for boom retraction that combines self-weight and pressure retraction, using a hydraulic system with a pressure retraction motor, a pressure retraction proportional valve, and a self-weight retraction proportional valve. The method controls the self-weight retraction proportional valve to maximum opening and adjusts the pressure retraction motor and valve to achieve a preset speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the boom retraction relies solely on self-weight without active pressure control, then the system complexity is reduced, but the retraction speed becomes uncontrollable and energy consumption cannot be optimized
Solution Approach 1:
The hydraulic system is segmented into two independent pathways: a self-weight retraction proportional valve for gravity-assisted retraction and a pressure retraction proportional valve for motor-driven pressure control. This segmentation allows each pathway to handle specific aspects of retraction, achieving controllable speed without excessive system complexity.
Solution Approach 2:
The system dynamically switches between self-weight retraction and pressure-assisted retraction based on real-time speed feedback. The control method adjusts the opening degrees of both proportional valves dynamically to maintain the boom retraction speed within the preset range, transforming a static system into a dynamically adaptable one.
2Productivity
If the boom retraction speed is increased to improve工作效率, then the working efficiency is improved, but the energy consumption increases
Solution Approach 1:
The control method implements closed-loop feedback by continuously monitoring the actual boom retraction speed and comparing it with the preset speed range. Based on the feedback signal, the system automatically adjusts the opening degrees of the proportional valves to maintain optimal retraction speed, ensuring high working efficiency while minimizing energy consumption.
Solution Approach 2:
The system changes the opening degree parameter of the proportional valves dynamically during retraction. By adjusting this parameter, the system optimizes the balance between retraction speed and energy consumption, allowing the boom to retract at the most energy-efficient speed while maintaining high productivity.
3Speed
If the pressure retraction motor runs at high speed to ensure fast retraction, then the retraction speed is improved, but the energy consumption and battery life are adversely affected
Solution Approach 1:
The system applies partial pressure assistance only when necessary to achieve the preset retraction speed, rather than continuously applying maximum pressure. By using the pressure retraction motor at optimal levels and relying on self-weight when sufficient, the system achieves fast retraction without excessive battery consumption.
Solution Approach 2:
The system converts the potential harm of high energy consumption into benefit by utilizing the boom's self-weight for retraction. By designing the system to primarily rely on gravity-assisted retraction with minimal pressure assistance, the patent transforms what would be wasted energy into useful gravitational potential energy, extending battery life while maintaining fast retraction speed.
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 method allows for precise control of boom retraction speed, reducing energy consumption and extending battery life, while ensuring reliable speed adjustment across various boom angles and lengths.
Implementation Method 1
a pressure retraction motor, a pressure retraction proportional valve and a self-weight retraction proportional valve that are sequentially connected
Implementation Method 2
the hydraulic system includes: a pressure retraction motor, a pressure retraction proportional valve and a self-weight retraction proportional valve
Implementation Method 3
controlling the self-weight retraction proportional valve to be at a maximum opening; obtaining an actual speed at which the boom is retracted; controlling a rotation speed of the pressure retraction motor to rise or an opening degree of the pressure retraction proportional valve to increase
Implementation Method 4
a hydraulic pump is driven by a pump motor, to provide dynamic for an action of a vehicle, and the pump motor works to provide dynamic only during the action
Data Source
AI summary
A control method for controlling retraction of a boom is applied to a hydraulic system which combines retraction of the boom by self-weight with retraction of the boom by pressure. The control method includes: when the boom is retracted, controlling the self-weight retraction proportional valve to be at a maximum opening; obtaining an actual speed at which the boom is retracted; controlling a rotation speed of the pressure retraction motor to rise or an opening degree of the pressure retraction proportional valve to increase when the actual speed is less than a preset speed; and controlling the rotation speed of the pressure retraction motor to reduce or the opening degree of the pressure retraction proportional valve to decrease when the actual speed is greater than the preset speed.