Ground Milling Machine Contact Runner Mounting Lever
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Solution Overview
Problem
Existing ground milling machines face measurement errors in determining milling depth due to the adjustment of the retaining device, which complicates the precise indication of the milling drum's penetration depth, especially when the retaining device is raised.
Innovation Solution
A contact device with a pivotable and adjustable contact runner and a mounting lever, where the mounting lever is positioned between the contact runner and the retaining device, minimizing horizontal movement and allowing precise milling depth determination using a single distance measuring device, such as an optical or mechanical sensor, without the need for separate error compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the retaining device is raised to prevent ground material accumulation, then the operational flexibility is improved, but measurement errors occur due to contact runner position changes
Solution Approach 1:
A mounting lever is introduced as an intermediary element between the contact runner and the retaining device. This lever pivotably connects the contact runner to the retaining device, allowing the contact runner to maintain a stable position relative to the ground while the retaining device can be raised or lowered independently. The mounting lever acts as a mediator that decouples the position of the contact runner from the position of the retaining device, thereby eliminating measurement errors while preserving operational flexibility.
2Measurement precision
If a rotation compensation curve is designed into the contact runner to compensate for measurement errors, then measurement precision is improved, but device complexity and wear increase
Solution Approach 1:
The complex rotation compensation curve design is extracted and removed from the contact runner. Instead of incorporating a specially shaped curve into the contact runner that would increase complexity and wear, the solution extracts this compensating function and replaces it with the simpler mounting lever mechanism. The mounting lever provides the necessary geometric compensation through its pivotable connection without requiring complex curve geometries.
Solution Approach 2:
The invention replaces the complex, wear-prone rotation compensation curve with a simpler, more durable mounting lever mechanism. The mounting lever is a robust mechanical element that can withstand wear and tear better than a precisely engineered contact curve, effectively using a simpler, more resilient component to achieve the same functional goal.
3Measurement precision
If multiple distance measuring devices are used to compensate for errors, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The mounting lever serves as a mechanical intermediary that eliminates the need for multiple distance measuring devices. By providing a stable geometric relationship between the contact runner and the retaining device, the mounting lever ensures that a single distance measuring device attached to the retaining device can accurately measure the position of the contact runner relative to the ground, even when the retaining device is raised or lowered.
Data Source
AI summary
The invention relates to a ground milling machine, comprising: a machine frame supported by front and rear travel units and at least partially height-adjustable; a milling drum housing arranged on the machine frame, comprising a milling drum that is rotatable about a horizontal axis of rotation perpendicular to the milling direction; a retaining device arranged in front of the milling drum housing in the milling direction with an adjustment device that enables the height adjustment of the retaining device in relation to the milling drum housing and the machine frame; and a ground contact device arranged in front of the milling drum housing in the milling direction with a contact runner and a mounting lever. The contact runner is adjustable in relation to the retaining device within a height-adjustment range and is mounted on the retaining device by way of the mounting lever. The contact runner comprises a first joint via which it is connected to the mounting lever in a pivotable fashion, the mounting lever being connected to the retaining device via a second joint and positioned between the contact runner and the retaining device in such a manner that, when the height of the retaining device is adjusted in relation to the contact runner, the mounting lever reaches or traverses an apex of the curve of movement of the mounting lever about the first or second joint, the apex delimiting the adjustment path of the mounting lever in the horizontal direction over the entire height-adjustment range, in particular in such a manner that the horizontal distance between the first and the second joint increases before subsequently decreasing. Finally, a distance measuring device is provided, with which the vertical distance or a correlating value between the machine frame and/or the milling drum housing and the contact runner can be measured.