Milling Rotor Housing Dynamics for Depth Performance
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Solution Overview
Problem
Generic ground milling machines experience reduced milling performance at large depths due to milled material accumulating inside the milling rotor housing, causing resistance against rotational movement.
Innovation Solution
A housing adjusting device that lifts the milling rotor housing's front edge with increasing milling depth, enlarging the interior space and reducing resistance by allowing milled material to accumulate underneath, while maintaining the processing pattern unchanged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the milling rotor housing maintains a fixed position relative to the machine frame, then the structural simplicity is preserved, but the milling performance deteriorates at large depths due to material accumulation resistance
Solution Approach 1:
The milling rotor housing is made dynamically adjustable relative to the machine frame through the housing adjusting device. The housing can be tilted about a transverse horizontal axis to change its position, allowing the front edge to be lifted or lowered depending on milling depth requirements. This dynamic adjustment enables the housing to adapt to different operating conditions, resolving the contradiction between maintaining structural simplicity and improving milling performance at large depths.
Solution Approach 2:
The position parameter of the milling rotor housing is changed by tilting it about a transverse horizontal axis. By adjusting the tilt angle, the front edge of the housing is lifted with increasing milling depth, which enlarges the interior space and reduces material accumulation resistance. This parameter change allows the system to optimize milling performance without fundamentally altering the basic housing structure.
2Productivity
If the milling rotor housing is lifted at the front edge with increasing milling depth, then the interior space is enlarged and material resistance is reduced, but the processing pattern may change
Solution Approach 1:
The housing adjusting device creates local quality changes by selectively lifting the front edge of the milling rotor housing while maintaining the rear edge position. This localized adjustment enlarges the interior space in the critical front region where material accumulation occurs, without affecting the overall processing pattern at the rear where the housing remains stable relative to the machine frame.
Solution Approach 2:
The milling rotor housing adjustment is segmented into independent rotational movement about a transverse horizontal axis. This segmentation allows the front portion of the housing to be adjusted independently from the rear portion, enabling space optimization in the front region while maintaining processing precision at the rear region.
3Reliability
If a closure of the milling rotor housing in its front region is implemented, then material ejection is prevented, but the interior space is reduced and material accumulation increases
Solution Approach 1:
Instead of closing the front region of the milling rotor housing to prevent material ejection, the invention inverts the approach by lifting the front edge of the housing to create more interior space. This inversion allows material to accumulate underneath the lifted front edge rather than inside a closed housing, thereby preventing ejection issues while maintaining high milling performance through reduced resistance.
Data Source
AI summary
A ground milling machine, in particular a soil stabilizer or a recycler, comprising a machine frame carried by front and rear traveling devices, a drive engine arranged on the machine frame, a ground milling device with a milling rotor supported for rotation about a horizontal rotation axis extending transversely to the working direction of the ground milling machine, said milling rotor having a plurality of ground processing tools, and with a milling rotor housing having an interior space which is open in the downward direction towards the underlying ground and in which the milling rotor is arranged, said milling rotor being height-adjustable via a milling depth adjusting device having a drive, and said milling rotor housing being connected to the machine frame via a housing support device. The invention further relates to a method for operating a ground milling machine. According to an essential aspect of the invention, provision is made for a lifting movement of the front edge of the milling rotor housing relative to the machine frame depending on the milling depth.