Adjustable Pitch Rotor for Milling Machines
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Solution Overview
Problem
Milling machines require multiple rotors to meet varying road texture requirements, leading to additional capital investment and labor costs due to the need for frequent rotor swaps.
Innovation Solution
An adjustable pitch rotor with a hollow cylindrical inner drum and split outer shell portions, allowing for longitudinal movement between two or more pitch configurations without removing the rotor from the machine, enabling the same rotor to produce different groove spacings by adjusting the cutting bit alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple rotors are used to meet varying road texture requirements, then the ability to meet different job requirements is improved, but capital investment and device complexity increase
Solution Approach 1:
The rotor is divided into two separate shell portions (first shell portion and second shell portion) that can be independently positioned. Each shell portion contains cutting assemblies, and the portions can be adjusted relative to each other to create different pitch configurations, allowing one rotor to replace multiple rotors.
Solution Approach 2:
The rotor shell portions are made adjustable rather than fixed. The shell adjustment mechanism allows the relative longitudinal position of the first and second shell portions to be changed, transforming the rotor from a static single-pitch component to a dynamic multi-pitch component that can adapt to different job requirements.
2Adaptability or versatility
If multiple rotors are kept in inventory for different job requirements, then adaptability is improved, but loss of time and labor costs increase due to rotor swapping
Solution Approach 1:
The rotor includes adjustable shell portions that can be repositioned relative to each other using the shell adjustment mechanism. This allows pitch changes to be made in-place without removing the rotor from the drum, eliminating the time and labor associated with swapping entire rotors while maintaining adaptability to different pitch requirements.
3Device complexity
If a single rotor with fixed pitch is used, then device complexity is reduced, but adaptability to varying job requirements deteriorates
Solution Approach 1:
The rotor shell is segmented into adjustable portions that can be independently positioned. This segmentation allows the same physical rotor structure to configure itself for different pitch requirements by changing the relative positions of the shell portions, providing adaptability without requiring multiple different rotor designs.
Solution Approach 2:
A single rotor design serves multiple functions by accommodating different pitch configurations. The adjustable shell portions allow the same rotor to be used for various road texture requirements, making the rotor universal and eliminating the need for multiple specialized rotors.
Data Source
AI summary
An adjustable pitch rotor for a milling machine includes an inner drum and an outer shell formed by first and second outer shell portions. Drum cutting assemblies with cutting bits extend outward from outer surfaces of the outer shell portions, with each of the cutting bits being longitudinally spaced from longitudinally adjacent cutting bits on their respective outer shell portions by a pitch distance. In a first pitch configuration, each cutting bit may be longitudinally aligned with a corresponding cutting bit on the other outer shell portion so that grooves milled in a work surface by the rotor are spaced by the pitch distance. In a second pitch configuration, each of the cutting bits may be longitudinally spaced from longitudinally adjacent cutting bits of the other outer shell portion by one-half the pitch distance to mill grooves in the work surface that are spaced by one-half the pitch distance.