Replaceable Milling Drum Fastening Mechanism
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Solution Overview
Problem
Existing ground milling machines face challenges in rapidly and easily attaching and detaching milling parts due to inaccessible fastening bolts, requiring significant force and time, especially in cramped spaces, which complicates transportation and width adjustments.
Innovation Solution
A fastening device with movable locking elements and counter elements, driven by a power source, allows for simple displacement between blocking and release positions, enabling quick attachment and detachment of milling parts without manual force application, and includes a failsafe mechanism to prevent accidental disengagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If solid fastening bolts and locking nuts are used to detachably connect the milling drum box to the machine frame, then the milling part can be removed for transportation and width adjustments, but the fastening bolts become inaccessible requiring other parts to be removed first, and large forces must be applied for mounting and removal
Solution Approach 1:
The fastening device is divided into two functional elements: a locking element that provides the locking function and a counter element that serves as the attachment point. This segmentation allows the locking element to be positioned in an accessible location while the counter element remains integrated with the milling drum box structure, eliminating the need to remove other parts for access.
Solution Approach 2:
Instead of having the fastening bolts accessible from the outside, the patent inverts the approach by having the locking element act on the counter element from within the milling drum box structure. The locking element is displaceable between a release position and a blocking position, blocking the counter element's movement in the removal direction, thereby providing secure fastening while maintaining accessibility.
2Reliability
If solid fastening bolts and locking nuts are used to secure the milling part, then reliable fastening is achieved, but correspondingly large forces must be applied for mounting and removal, especially in structurally cramped conditions
Solution Approach 1:
The patent replaces the traditional mechanical fastening system (bolts and nuts requiring manual tightening with large forces) with a displacement-based locking mechanism. The locking element is displaceable between release and blocking positions, allowing the milling part to be securely fastened or released with minimal force, eliminating the need for manual force application in cramped conditions.
3Weight of moving object
If the milling part is made removable for transportation purposes, then the ground milling machine can be made lighter, but the time required for removal and mounting increases
Solution Approach 1:
The locking element is pre-positioned in the blocking position to engage the counter element, and the displaceable mechanism is designed to allow rapid transition between locked and unlocked states. This preliminary configuration enables quick attachment and detachment of the milling part, significantly reducing the time required for replacement while maintaining secure fastening during transportation.
Data Source
AI summary
The present invention relates to a ground milling machine, in particular, a road cold milling machine, having a replaceable milling drum unit. To make this replacement procedure easier, the present invention proposes a fastening device between the milling part and the machine part of the ground milling machine. The present invention furthermore relates to a method for replacing a milling part on the ground milling machine, a fastening device being used for this purpose.