Floating Milling Drum Mounting Pin Alignment
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Solution Overview
Problem
Small road milling machines face difficulties in handling and replacing one-piece milling drums due to their high weight, eccentric center of gravity, and irregular surface structure, making manual assembly and disassembly challenging and prone to damage.
Innovation Solution
Incorporating a mounting pin that protrudes axially from the milling drum drive, allowing the drum to be aligned and supported on the pin for easier turning and attachment, with the option for replacement or alternative shapes, and a central arrangement for secure mounting, along with a cover cap for protection and a multi-interrupted support surface for stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a one-piece milling drum is used for small road milling machines, then the structural simplicity is improved, but the handling and replacement difficulty increases due to high weight and eccentric center of gravity
Solution Approach 1:
The milling drum is divided into two main parts: a basic drum body that remains on the machine and an interchangeable milling tube that can be quickly removed and replaced. This segmentation allows the heavy one-piece drum structure to be simplified into manageable components, where only the milling tube needs to be handled during replacement, significantly reducing handling difficulty while maintaining the structural integrity of the overall drum assembly.
Solution Approach 2:
The milling tube is extracted as a separate interchangeable component from the basic drum body. By removing the milling tube from the complete drum assembly, the handling weight is reduced from the full drum weight (up to 300 kg) to just the milling tube weight, making manual handling and replacement feasible despite the eccentric center of gravity issue in the original one-piece design.
2Volume of moving object
If the connecting flange is positioned eccentrically to accommodate the milling drum drive, then the space utilization is improved, but the milling drum stability during handling deteriorates due to tilted positioning
Solution Approach 1:
A mounting pin is introduced as an intermediary component between the milling drum and the drum gear. The mounting pin engages with a corresponding opening in the connecting flange and protrudes axially to provide a stable support point. This intermediary element compensates for the eccentric positioning of the connecting flange, allowing the milling drum to be stabilized during handling and replacement operations despite the non-central flange location required for space utilization.
3Strength
If stud bolts are used to fasten the milling drum to the drum gear, then the secure attachment is improved, but the damage risk increases due to uneven ground conditions and improper handling
Solution Approach 1:
The mounting pin is installed and positioned in advance before the milling drum is fully attached to the drum gear. This preliminary action establishes a stable alignment and support structure that guides the milling drum into proper position, preventing improper handling that could damage the stud bolts. The mounting pin acts as a preliminary alignment aid that ensures the milling drum is correctly positioned before the final fastening with nuts, reducing the risk of stud bolt damage from uneven ground conditions or misalignment.
4Weight of moving object
If the milling drum is made heavy to ensure durability and processing capability, then the processing performance is improved, but the assembly and disassembly difficulty increases
Solution Approach 1:
The heavy milling drum is segmented into a stationary basic drum body and a removable milling tube. The basic drum body retains the necessary weight for durability and processing capability, while the milling tube is designed to be lighter and interchangeable. This segmentation allows the system to maintain the weight benefits of a heavy drum for processing performance while enabling easy assembly and disassembly of the milling tube component without handling the entire heavy drum assembly.
Data Source
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AI summary
In a road milling machine, in particular a small milling machine (1), for processing road surfaces (2), comprising a machine frame (4), a milling drum (12) mounted in the machine frame (4) and driven by a milling drum drive (10), wherein studs (24) for mounting the milling drum (12) project from the milling drum drive (10), which, in the mounted state, engage in correspondingly arranged recesses (26) in a connecting flange (14) of the milling drum (12), it is provided that the milling drum drive (10) has at least one mounting pin (20) which engages in a corresponding opening (28) in the connecting flange (14) of the milling drum (12) adapted to the mounting pin (20), wherein the mounting pin (20) projects axially far beyond the studs (24) such that the milling drum (12) is supported on the mounting pin before engagement with the studs. (20) is available.