Dynamic Valve Control for Hydraulic Lifting Apparatus Pressure Stability
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Solution Overview
Problem
The existing clamping and lifting apparatus on single-rope and multi-rope Koepe hoisting installations face critical operational states due to insufficient hydraulic oil replenishment, leading to pressure breakdowns and vacuum formation, especially when lifting against gravity, as the hydraulic system is not adaptable to varying loads and speeds.
Innovation Solution
A method for regulating the speed of the clamping and lifting apparatus by dynamically adjusting the valve opening of the master cylinder based on the working direction, current speed, and target speed to ensure sufficient hydraulic fluid replenishment, preventing pressure breakdowns and vacuum formation, and incorporating readjustment mechanisms for slave cylinders to maintain balance and constant speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a permanently preset voltage value is used for controlling the valve, then the valve can be simply controlled, but the hydraulic oil replenishment is insufficient when load increases, leading to pressure breakdown and vacuum formation
Solution Approach 1:
The patent applies dynamics by transitioning from a static, permanently preset voltage control to a dynamic control system that continuously adapts the valve opening based on real-time speed feedback. The control unit adjusts the valve actuator's position dynamically to maintain optimal hydraulic flow under varying load conditions, preventing pressure breakdown and vacuum formation while keeping the control system relatively simple.
Solution Approach 2:
The patent implements feedback control by using a speed sensor to continuously monitor the actual speed of the master cylinder and feeding this information back to the control unit. The control unit compares the actual speed with the target speed and adjusts the valve opening accordingly, ensuring sufficient hydraulic oil replenishment even when load increases, thus maintaining pressure stability without significantly complicating the control mechanism.
2Productivity
If the lifting cylinders operate at high speed with load towards the top, then productivity increases, but the load presses hydraulic oil out too fast, causing pressure breakdown and vacuum formation
Solution Approach 1:
The feedback control mechanism monitors the actual lifting speed and adjusts the valve opening to maintain the target speed. When the load presses hydraulic oil out too fast during high-speed operation, the speed sensor detects the speed increase, and the control unit reduces the valve opening to limit oil discharge, preventing pressure breakdown and vacuum formation while allowing high-speed operation to continue.
Solution Approach 2:
The patent changes the valve opening parameter dynamically based on operating conditions. During high-speed lifting with load towards the top, the system adjusts the valve opening degree to optimize the balance between maintaining target speed and preventing excessive oil discharge, thereby maintaining pressure stability without sacrificing productivity.
3Use of energy by moving object
If the pumps are configured for the required amount of hydraulic oil for projected speed, then energy consumption is optimized, but they cannot replenish sufficient hydraulic oil when actual speed exceeds projected speed, leading to critical operational states
Solution Approach 1:
The patent applies dynamics by making the valve opening adaptive rather than fixed. The system maintains pump configuration optimized for projected speed (energy efficiency) but uses real-time speed feedback to dynamically adjust the valve opening when actual speed deviates from projected speed, ensuring sufficient hydraulic oil replenishment without requiring oversized pumps, thus maintaining both energy efficiency and system reliability.
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
This solution allows the clamping and lifting apparatus to operate outside critical operational states, enhancing efficiency, service life, and operational reliability by ensuring consistent hydraulic fluid supply and maintaining constant speed regardless of load direction or movement.
Implementation Method 1
A hydraulic fluid can be fed and discharged through respectively one opening in at least two cylinder chambers of the at least one master cylinder via at least one pumping device and via at least one valve device per cylinder chamber for lifting and lowering loads
Data Source
AI summary
A method for regulating the speed of a clamping and lifting device (1) with at least one guide cylinder (2). A hydraulic fluid can flow in and out through in each case one opening in at least two cylinder chambers of the at least one guide cylinder (2) via at least one pump device and via at least one valve device per cylinder chamber for lifting and lowering loads (16). The degree of opening of the valve of the at least one valve device in each case can be changed as a function of the working direction of the device (1), a setpoint speed (10) and the current speed (11) of the at least one guide cylinder (2).