Independent Cable Drum Control for Load Suspension
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Solution Overview
Problem
Existing transport units for containers and loads are heavy due to the need for additional drive units like piston-cylinder units for fine positioning, which increases the dead weight and complicates movement.
Innovation Solution
Each lifting cable is wound on a separate cable drum that can be driven independently at different speeds and directions, allowing for precise control of the load suspension device without additional drive units, and the cable drums can be synchronized for vertical movement, with intersecting cables providing stability and reduced cable forces through deflection pulleys.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional drive units like piston-cylinder units are used for fine positioning of the load suspension device, then positioning precision is improved, but the dead weight of the load suspension device increases
Solution Approach 1:
The invention extracts the fine positioning function from separate piston-cylinder units and integrates it into the cable drum system. Each cable drum is equipped with a drive unit that can independently control the cable length, allowing the load suspension device to be positioned precisely by differential winding of the cables, thereby eliminating the need for additional positioning mechanisms and reducing dead weight
Solution Approach 2:
The cable drums serve multiple functions: they provide the primary lifting force by winding and unwinding cables, and simultaneously enable fine positioning through independent rotational control. This multi-functionality eliminates the need for separate positioning mechanisms, reducing the overall weight of the load suspension device while maintaining positioning precision
2Measurement precision
If additional drive units and components are added for fine positioning, then positioning capability is improved, but the complexity of the device increases
Solution Approach 1:
The invention merges the fine positioning function with the existing cable drum lifting mechanism. By equipping each cable drum with an independent drive unit capable of precise rotational control, the system achieves fine positioning through the same components used for lifting, thereby eliminating separate positioning mechanisms and reducing overall device complexity
Solution Approach 2:
The cable drum system serves itself by using the same winding mechanism for both lifting and fine positioning tasks. The independent drive units on the cable drums can make small adjustments to cable length to achieve precise positioning, eliminating the need for separate positioning systems and reducing hydraulic assemblies, electric components, and sensors
3Stability of the object's composition
If multiple lifting cables are used for load suspension, then stability is improved, but the cable forces increase requiring heavier cables
Solution Approach 1:
The invention segments the load suspension system into multiple independently controllable cable drum units, each handling a portion of the total load. By distributing the load across multiple cables and enabling independent control of each cable drum, the system maintains stability through multiple support points while reducing the force burden on each individual cable
Solution Approach 2:
The invention replaces traditional mechanical force distribution systems with an active control system using independently driven cable drums. By using motorized control to adjust cable lengths and tensions dynamically, the system achieves stable load suspension with reduced cable forces compared to passive mechanical systems that rely on fixed geometric arrangements
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 reduces the weight of the load suspension device, enhances precision and stability, and allows for six degrees of freedom movement, extending the service life of lifting cables by distributing loads effectively and preventing overloads.
Implementation Method 1
each lifting cable can be wound up and/or is at least partially wound up on a separate cable drum (4), and all of the cable drums (4) are drivable independently of one another at different rotational speeds and/or in different directions of rotation
Data Source
AI summary
A transport unit (1) for transporting at least one container (31) or another load, wherein the transport unit (1) has at least one trolley (2) and at least one load suspension device (3) and at least eight lifting cables (20-27), and the load suspension device (3) has connecting means (14) for fastening the container (31) or the other load and is suspended on the trolley (2) such that it can be lifted and lowered by the lifting cables (20-27), wherein the lifting cables (20-27) can be wound up on cable drums (4) which are rotatably mounted on the trolley (2), wherein each lifting cable (20-27) can be wound up and/or is wound up at least in part on a separate cable drum (4), and the rotational speed and/or the direction of rotation for all the cable drums (4) can each be set individually.