Telescopic Rotor Support Arm Length Adjustment for Hay Rakes
Solution Overview
Problem
Existing haymaking machines with telescopic rotary rake support arms face issues such as limited adjustability, forced length changes during pivoting, and stability problems due to high center of gravity during transport, which restrict swath width settings and operational flexibility.
Innovation Solution
A length adjustment drive with a pressure medium cylinder and adjustable articulation point allows independent adjustment of the rotor support arm length, decoupling it from the pivoting position, enabling variable swath width settings and enhanced adaptability to different operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the rotor support arm is designed to be telescopic with a compulsory mechanism for forced retraction during pivoting, then the center of gravity is lowered for better transport stability, but the swath width setting is prevented and the full length cannot be used in raised positions
Solution Approach 1:
The rotor support arm is divided into multiple telescopic segments that can be independently adjusted. This segmentation allows the arm to be extended or retracted to different lengths without being forced by a compulsory mechanism, enabling both transport stability (when retracted) and swath width variability (when extended to different lengths).
Solution Approach 2:
The support arm length is made dynamically adjustable through a length adjustment drive that operates independently of the pivoting mechanism. This dynamic adjustment capability allows the operator to optimize the arm length for each specific task - fully extended for maximum swath width during harvesting, or retracted for transport stability - without mechanical coupling between pivoting and length changes.
2Adaptability or versatility
If a lever mechanism with repositionable articulation points is used to control support arm length, then different lengths can be set, but the length is permanently specified once the hole position is selected, limiting variability
Solution Approach 1:
The manual lever mechanism with fixed articulation points is replaced by a motorized length adjustment drive with a movable articulation point. This substitution transforms the discrete, permanent settings into a continuous, dynamically adjustable system that can be changed on-the-fly without manual repositioning of levers or selection of pre-defined holes.
Solution Approach 2:
A movable articulation point acts as an intermediary between the fixed mounting structure and the telescopic support arm. This intermediary can be continuously repositioned along the support arm, enabling smooth, incremental length adjustments rather than being constrained to fixed positions, thereby greatly enhancing operational flexibility.
3Stability of the object's composition
If the rotor support arm is forced to retract when pivoted upwards, then the transport position is optimized, but the full length cannot be utilized on slopes where the arm swings upwards for ground adaptation
Solution Approach 1:
The compulsory retraction mechanism is completely removed from the system. The length adjustment drive operates independently of the pivoting position, extracting the constraint that previously forced the arm to retract during upward movement. This allows the full length of the support arm to be maintained even when pivoted upwards for transport or when swinging for ground adaptation on slopes.
4Adaptability or versatility
If a length adjustment drive actuated independently of pivoting is used, then full adjustability is achieved, but the adjustment range remains limited
Solution Approach 1:
The support arm employs a telescopic design with nested segments that can be extended multiple times beyond the base length. Combined with the movable articulation point that can be repositioned along the extended segments, this nesting structure multiplies the effective adjustment range, allowing the arm to achieve both maximum extension for large swath widths and precise intermediate positions for fine-tuned adjustments.
Data Source
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AI summary
The machine has rakes (2) hinged at a machine frame (4) around a pivoting axis by a rotary support arm and moved from a lowered working position to a transport and/or headland position by a pivoting drive. The arm is telescopically formed and adjustable in length. A length adjustable drive adjusts the length of the arm independent of the pivoting position of the arm, where the length adjustable drive is actuated independent of the pivoting position of the arm and/or independent of the pivoting drive.