Lifting-Device Brake Pressure Maintenance for Wave Compensation
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Solution Overview
Problem
Lifting-device brake systems activated by spring force can inadvertently engage during wave compensation, causing instability and potential damage when used on floating platforms, especially when energy supply fails or during emergency stops.
Innovation Solution
Incorporating a hydraulic or pneumatic assembly with a switching valve and emergency switching valve to maintain pressure in the piston/cylinder assemblies, preventing brake activation during emergency stops and ensuring operational reliability by creating a redundant pressure maintenance system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the brake assembly is activated by spring force to ensure operating reliability, then the braking reliability is improved, but the brake may inadvertently engage during wave compensation, causing instability and potential damage
Solution Approach 1:
A hydraulic or pneumatic intermediary system is introduced between the spring force and the brake assembly. This intermediary maintains a counteracting pressure that prevents the spring force from activating the brake during wave compensation, while still allowing the brake to engage reliably when needed through controlled pressure reduction
Solution Approach 2:
The hydraulic or pneumatic pressure is applied in advance to the piston/cylinder assembly to counteract the spring force before wave compensation begins. This preliminary action ensures the brake remains disengaged during normal operation and wave compensation events
2Reliability
If the brake assembly is designed to be blocked when pressure losses occur in the hydraulic or pneumatic assembly, then the operating reliability is improved, but the brake cannot be released during emergency stop, causing high forces on the load and platform
Solution Approach 1:
The pressure maintenance system is segmented into multiple independent components including a switching valve and an emergency switching valve. This segmentation allows the emergency switching valve to independently override the pressure maintenance function during emergency stops, releasing the brake without affecting the reliability benefits during normal operation
Solution Approach 2:
The system transitions from a static pressure maintenance approach to a dynamic one where the emergency switching valve can actively modify the pressure state in response to emergency conditions. This dynamic capability allows the brake to be released when needed while maintaining reliability under normal conditions
3Reliability
If a switching valve is added to maintain hydraulic or pneumatic pressure, then the brake activation reliability is improved, but the device complexity increases
Solution Approach 1:
The switching valve is designed to perform multiple functions: maintaining pressure during wave compensation, allowing normal brake operation, and enabling emergency release through the emergency switching valve. This multi-functionality reduces the need for additional separate components, mitigating the complexity increase
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
Prevents unintended brake activation during wave compensation and energy supply failures, maintaining operational stability and preventing damage to lifting devices and platforms.
Implementation Method 1
the pressure via which stationary actuating elements are pressed against rotating parts of the brake assembly, in the case of disk brake assemblies, the brake linings against the brake disk, is provided mechanically via a spring force
Implementation Method 2
at least one piston/cylinder assembly which can be hydraulically or pneumatically actuated and via which the braking effect that can be achieved by the at least one brake assembly can be reduced by at least partially overcoming the spring force
Data Source
AI summary
A lifting-device brake system includes at least one brake assembly configured to be activated by a spring force. The at least one brake assembly is configured to achieve a braking effect. At least one piston/cylinder assembly is configured to be actuated by a hydraulic or pneumatic pressure via which the braking effect achieved by the at least one brake assembly can be reduced by at least partially overcoming the spring force. A hydraulic or pneumatic assembly is configured to provide the hydraulic or pneumatic pressure to actuate the at least one piston/cylinder assembly. The hydraulic or pneumatic assembly comprises an apparatus configured to maintain the hydraulic or pneumatic pressure applied to the at least one piston/cylinder assembly.