Dock Leveler Control Valve Energy Saving Mode
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Solution Overview
Problem
Existing dock leveler systems face limitations in design freedom and resource efficiency due to high power consumption from solenoid valves and potential damage from cross-traffic loads, which necessitate either larger hydraulic cylinders or stiffer constructions, increasing material costs.
Innovation Solution
Implementing a dock leveler control system that dynamically switches between an energy-saving mode and a holding/operating mode based on load threshold assessments, keeping control valves closed in energy-saving mode and open in holding/operating mode, allowing for smaller, less stable constructions while managing cross-traffic loads effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solenoid valves are kept open in rest state to support dock leveler, then reliability is improved, but energy consumption increases
Solution Approach 1:
The control valve dynamically changes its state based on operational conditions. In charge state, the valve remains open to provide hydraulic support for the dock leveler. In rest state, the valve closes to save energy. This dynamic adaptation resolves the contradiction between maintaining reliability and reducing energy consumption.
Solution Approach 2:
The system changes the operational parameter of the control valve (open/closed state) based on the charge/rest state of the dock leveler. This parameter change allows the system to switch between energy-intensive support mode and energy-saving rest mode, resolving the contradiction between reliability and energy consumption.
2Strength
If hydraulic cylinders are enlarged to handle cross-traffic loads, then strength is improved, but device complexity increases
Solution Approach 1:
Instead of using permanently oversized hydraulic cylinders, the system dynamically activates the hydraulic support only when cross-traffic loads are detected or during charge states. This allows the use of smaller, simpler cylinders that are sufficient for normal operation, while providing enhanced load capacity when needed through the controlled opening of the solenoid valve.
3Strength
If dock leveler construction is stiffened to resist cross-traffic, then strength is improved, but material costs increase
Solution Approach 1:
The invention replaces purely mechanical reinforcement (stiffer construction) with a controlled hydraulic support system. By using the hydraulic cylinder and control valve to provide active support when needed, the system achieves cross-traffic resistance without requiring excessive structural reinforcement, thereby reducing material quantity and costs.
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 approach reduces energy consumption and material costs by allowing dock levelers to operate efficiently with smaller components, while preventing damage from cross-traffic loads by maintaining valve openness during high loads, thus optimizing energy use and structural design.
Implementation Method 1
The valve is usually opened by energizing a solenoid or some other coil in order to generate a magnetic field which opens a tappet of the valve.
Implementation Method 2
The hydraulic pressure is supplied by a pressure source in the form of a hydraulic pump with an electric motor.
Data Source
AI summary
The invention relates to a method for setting up and operating a loading ramp arrangement. In loading ramps, in which no cross-traffic or only cross-traffic with low density is to be expected, an energy-saving mode can automatically be selected in the rest state of the loading ramp. In loading ramps, in which cross-traffic of this type with higher densities is possible, the possibility of the selection of an energy-saving mode is not provided or is blocked. As a result, particularly energy-saving operation can be made possible in loading stations with loading ramps without cross-traffic, but material can be saved in the loading ramps, where cross-traffic is to be expected.