Displacement Controller Hydraulic Boom Adjustment
Solution Overview
Problem
Conventional hydraulic control systems for boom adjustment in lifting gears, such as telescopic cranes, suffer from vibration issues and energy inefficiency due to the use of brake and throttle valves, leading to sluggish response and high energetic losses.
Innovation Solution
The implementation of a displacement controller using a pump to control the hydraulic actuator, eliminating the need for throttle valves and allowing for precise, fast-response motion control, with optional inclusion of a second pump and hydraulic pressure accumulator to manage volume differences and leakage, and check valves to prevent unintended movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If brake valves or throttle valves are used to control the hydraulic actuator, then the boom adjustment can be controlled, but vibrations occur and the system response becomes sluggish
Solution Approach 1:
The patent removes brake valves and throttle valves from the hydraulic control system, replacing them with a displacement controller that directly regulates hydraulic fluid flow to the actuator. This extraction of problematic components eliminates the source of vibrations and sluggish response while maintaining control capability.
Solution Approach 2:
The patent replaces the mechanical valve-based control system with an electronic displacement controller that directly actuates the hydraulic pump. This substitution eliminates the intermediate mechanical components (brake and throttle valves) that caused vibrations and delayed response, achieving faster and smoother boom adjustment.
2Ease of operation
If brake valves or throttle valves are used to control the hydraulic actuator, then the boom adjustment can be controlled, but energy losses increase
Solution Approach 1:
The patent removes throttle valves and their associated damping orifices from the system. By eliminating these components, the patent removes the source of energy dissipation through friction and turbulence, thereby reducing overall energy losses while maintaining effective boom control.
Solution Approach 2:
The patent replaces the energy-inefficient mechanical valve system with an electronic displacement controller that directly regulates hydraulic flow. This substitution eliminates the continuous energy dissipation occurring at valve orifices and damping holes, significantly improving system energy efficiency.
3Object-affected harmful factors
If the hydraulic system is heavily damped via hydraulic orifices to reduce vibrations, then vibrations are reduced, but controllability by the operator deteriorates
Solution Approach 1:
The patent removes hydraulic orifices and damping components from the system. By eliminating these damping elements, the patent removes the source of controllability degradation while addressing vibrations through a different mechanism—the direct electronic control of hydraulic flow without restrictive orifices.
Solution Approach 2:
The patent replaces the passive mechanical damping system (hydraulic orifices) with an active electronic control system. This substitution allows the system to reduce vibrations through precise electronic regulation of hydraulic flow rather than through restrictive mechanical orifices that degraded controllability.
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 provides precise, sensitive, and fast control of boom movement while reducing energy losses and vibrations, enhancing energy efficiency and preventing unwanted actuator movements.
Implementation Method 1
a pump (9) for delivering pressure fluid from one pressure chamber (10) to the other pressure chamber (11) of the hydraulic actuator (5)
Data Source
AI summary
A lifting gear, in particular a telescopic boom crane, including at least one boom, a boom adjustment unit including at least one hydraulic actuator for adjusting the boom, and a control device for controlling the movement of the hydraulic actuator, the control device being provided with a displacement controller having at least one pump for adjusting the hydraulic actuator.