Hoisting Apparatus Hose Routing for Rotator Durability
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Solution Overview
Problem
Existing hoisting apparatus designs for work machines, such as forest machines, face issues with the durability of pressure-medium lines and joints due to stress from movement, leading to limited movement and usability, as well as complex and prone-to-damage constructions.
Innovation Solution
The pressure-medium lines are routed to extend past the connectors of the rotation device in the longitudinal direction, forming a hose loop and dividing into connectors on both sides relative to the plane defined by the boom and rotation device, allowing free swinging of the pivoted joint and improving durability by protecting the lines from external impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the pressure-medium lines are routed close to the pivoted joint and axis of rotation to connect the rotation device, then the connection is compact and direct, but the hoses and joints are subjected to movement stresses that reduce their durability
Solution Approach 1:
A fairlead is introduced as an intermediary component through which the pressure-medium lines are routed. The fairlead is attached to the rotation device and guides the hoses in a controlled manner, preventing direct stress transmission to the connectors while maintaining functional connection. This mediator allows the lines to follow a longer, more protected path that reduces wear and extends durability.
2Ease of operation
If the pressure-medium lines are routed through the pivoted joint to connect the rotation device, then the connection is direct and functional, but the swinging movement causes stresses that reduce the durability of joints and hoses
Solution Approach 1:
The fairlead serves as a mediator between the pivoted joint and the pressure-medium lines. By routing the lines through the fairlead rather than directly through the pivoted joint, the system maintains functional connection while the fairlead absorbs and distributes the stresses caused by swinging movements, protecting both the joints and hoses from damaging stress concentrations.
Solution Approach 2:
The pressure-medium lines are routed in a three-dimensional path that extends away from the pivot axis before connecting to the rotation device. This spatial arrangement allows the lines to accommodate angular movements of the pivoted joint without experiencing excessive bending stresses, as the lines have additional spatial freedom to follow the movement arc.
3Volume of moving object
If the connectors are placed close to the pivoted joint for direct connection, then the routing is compact, but the swinging of the rotator causes movement and stresses in the hose and joint that reduce durability
Solution Approach 1:
The fairlead acts as an intermediary that decouples the connectors from direct exposure to pivot stresses. The connectors can be positioned relatively close to the pivoted joint for compact routing, but the fairlead intercepts and manages the stresses generated by swinging movements, preventing direct transmission to the hose connections and maintaining durability.
Data Source
AI summary
A hoisting apparatus includes a rotation device with connectors for connecting pressure-medium lines to a rotation device, a boom, from which the pressure-medium lines are arranged to lead to the rotation device, and a pivoted joint for suspending the rotation device on the boom. The pivoted joint includes two consecutive pivots in a longitudinal direction of the rotation device. The rotational axes of the pivots are at right-angles to each other. The pressure-medium lines are routed between lugs of the pivot on a boom side of the pivoted joint, past the connectors of the rotation device in the longitudinal direction of the rotation device, to turn towards the connectors to form a hose loop and then routed to the connectors of the rotation device. The pressure-medium lines are arranged on both sides of the rotation device related to a plane defined in the longitudinal direction of the boom and the longitudinal direction of the rotation device.