Telescopic Guide Rod Spring System for Harvester Feeder Roller
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Solution Overview
Problem
Existing spring systems for feeder rollers in forage harvesters face challenges in applying consistent roll forces to compress crops effectively across varying layer thicknesses, leading to irregularities and potential blockages, while also posing safety hazards and distractions due to exposed moving parts and noise from stops.
Innovation Solution
A spring system utilizing a telescoping guide rod with a co-axial spring and a removable stop to pre-tension the spring assembly, allowing for easier installation and removal, and featuring a pivotable connection to accommodate non-linear roller movement, along with a damping system to reduce noise and improve safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the roll forces are increased to compress the crop into a compact mat, then the crop compression is improved, but irregularities in the feeding process and blockages occur
Solution Approach 1:
The spring system allows the pre-pressing and pressing rollers to move dynamically in the vertical direction, automatically adjusting the roll force according to crop layer thickness. The spring constant and roller weight create a dynamic force adaptation mechanism that prevents both insufficient compression and excessive force causing blockages.
Solution Approach 2:
The system changes the roll force parameter dynamically based on crop conditions. By varying the spring constant, roller weight, and initial spring compression, the roll force can be optimized for different crop types, layer thicknesses, and harvesting conditions to maintain reliable feeding without blockages.
2Reliability
If the roll forces are decreased to avoid blockages, then the feeding process stability is improved, but the crop compression is insufficient
Solution Approach 1:
The spring system enables dynamic adjustment of roll force, allowing the rollers to apply sufficient compression force when needed while automatically reducing force when crop density increases, thus preventing blockages while maintaining adequate compression.
Solution Approach 2:
The spring system provides mechanical feedback through the vertical movement of rollers and the corresponding compression of the spring. This feedback mechanism automatically regulates the roll force based on the resistance encountered from the crop, ensuring optimal compression without causing blockages.
3Ease of manufacture
If the spring system components are exposed for ease of installation, then the assembly is simplified, but safety hazards and noise from stops increase
Solution Approach 1:
The guide rod is designed with nested telescopic sections that can be easily assembled and disassembled. The stop is integrated into the guide rod structure, and the spring is contained within the guide rod housing, allowing simple assembly while keeping all components enclosed during operation to eliminate safety hazards and noise.
Solution Approach 2:
The stop function is extracted as a separate removable component that can be installed or removed independently. This allows the guide rod to be assembled without the stop for ease of construction, while the stop can be added later to enclose the spring system and eliminate safety hazards and noise during operation.
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 provides a safer, quieter, and more efficient spring system that maintains consistent roll forces, reduces the risk of blockages, and simplifies assembly and disassembly by allowing pre-compression of the spring, enhancing the operational reliability of the feeder device.
Implementation Method 1
a spring system utilizing a telescoping guide rod with a co-axial spring
Implementation Method 2
the spring assembly pre-tension
Implementation Method 3
along with a damping system to reduce noise and improve safety
Data Source
Figure 1~3
Figure 2
Figure 4~5
AI summary
A spring system (122) is described for a feeder device (101) of an agricultural harvester having a first roller movably mounted in a casing (105) and biased by the spring system towards a second roller (107) in order the compress crop passing between the two rollers. The spring system comprises at least one spring (124) surrounding a guide rod (200) that extends in use between a movable support of the first roller and the casing of the feeder device. The guide rod (200) is formed of two telescopically collapsible parts (210, 212), one connected to the roller support (108) and the other to the casing (105).