Brake Coupling for Load Hook Rotation Control
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Solution Overview
Problem
Load handling devices face challenges in preventing high shear forces during lifting and ensuring precise load positioning, as existing solutions either allow unwanted rotational movements or fail to provide a rigid connection between the load hook and suspension unit.
Innovation Solution
A load handling device with a brake coupling system that includes two coupling parts with contact surfaces, allowing for controlled rotary movement between the load hook and suspension unit, and an adjustable braking mechanism using an electric actuator to manage frictional forces, enabling a flexible mechanical coupling for load movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a rigid connection between the load hook and suspension unit is provided, then the load can be positioned precisely without unwanted rotational movements, but high shear forces occur in the hoisting gear during lifting
Solution Approach 1:
The brake coupling allows the connection between load hook and suspension unit to dynamically switch between rigid (when braking) and flexible/rotatable (when released). During lifting, the coupling can be released to allow rotational movement and prevent shear forces, while during positioning, braking engages to create a rigid connection for precise positioning.
Solution Approach 2:
The braking mechanism changes the friction parameter between coupling parts to control the rotational degree of freedom. By adjusting the contact pressure between brake surfaces, the system transitions between allowing rotation (low friction engagement) and preventing rotation (high friction engagement), thus adapting to different operational requirements.
2Force
If the load hook is allowed to rotate freely about the vertical axis, then high shear forces are prevented during lifting, but unwanted rotational movements occur during load positioning
Solution Approach 1:
The brake coupling enables dynamic control of the load hook's rotational freedom. During lifting operations, the coupling is released to allow free rotation and prevent shear forces. During positioning operations, the braking mechanism engages to restrict rotation and enable precise load placement.
Solution Approach 2:
The brake coupling system automatically adapts to operational needs through its design - when the load hook experiences forces during lifting, the coupling can be released to allow rotation, and when positioning is required, the system can be braked to prevent unwanted movements, serving both functions through a single mechanism.
3Adaptability or versatility
If a brake coupling with adjustable contact pressure is provided, then the mechanical coupling can be flexibly adjusted for different load movements, but the device complexity increases
Solution Approach 1:
The adjusting device modifies the contact pressure parameter between brake surfaces to create different friction forces. By varying this parameter, the system adapts to different load weights and movement requirements, providing flexible control from fully released to fully braked states.
Solution Approach 2:
The brake coupling acts as an intermediary mechanism between the load hook and suspension unit, mediating the rotational degree of freedom. The adjusting device controls this intermediary element to provide the desired level of coupling stiffness for different operational conditions.
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 solution effectively prevents high shear forces during lifting and allows for precise load positioning by providing a rigid connection when needed, with adjustable braking friction to accommodate various load movements, enhancing the device's operational efficiency and safety.
Implementation Method 1
an effective braking frictional force between the clutch parts
Data Source
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AI summary
The device i.e. hook block (10), has hanging unit (12) for hanging the device at a Bowden cable and comprising a bearing with a horizontal bearing axis. The unit has another bearing with a vertical rotational axis (44). A brake clutch has coupling parts with respective contact surfaces. The parts are movable relative to each other in a friction-bearing manner. The parts are connected with a load hook (30) and the hanging unit, respectively for controlled coupling of rotating movement of the hook around the vertical rotational axis relative to the hanging unit.