Self-Propelled Construction Machine Sealing Device
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Solution Overview
Problem
Road milling machines face challenges in operating modes where not all milled material is loaded, leading to material retention and increased friction, while stabilizers and recyclers lack a transport facility, requiring adjustments in sealing elements to prevent material escape and ensure proper operation.
Innovation Solution
A self-propelled construction machine with a sealing device featuring a pivotally arranged stripping element that adjusts its height based on the milled material's height, using a measuring device and control system to maintain a predetermined pivoting range, ensuring the sealing element is correctly positioned to prevent material retention and unintentional entry into the milling drum housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the sealing element is raised to allow partial material loading, then material can remain in the milling track, but the milling drum housing becomes open and material can be thrown out
Solution Approach 1:
The sealing system is divided into multiple independent sealing elements (front sealing element, rear sealing element, and intermediate sealing elements) that can be individually adjusted. This segmentation allows each element to perform its specific function: front elements prevent material from entering the housing, while the rear element controls material discharge, resolving the contradiction between partial loading and housing closure.
Solution Approach 2:
The sealing elements are made height-adjustable through adjusting devices, transforming them from static to dynamic components. This allows the sealing elements to adapt their position based on the operating mode (complete loading, partial loading, or no loading), enabling the system to maintain housing closure reliability while accommodating different material loading requirements.
2Reliability
If the sealing element is lowered to close the housing, then material is contained, but material accumulates in the housing causing increased friction and reduced performance
Solution Approach 1:
The sealing system is divided into front sealing elements that close the housing and rear sealing elements that allow material discharge. This segmentation enables the front elements to maintain housing closure for reliability while the rear elements ensure material can escape to prevent accumulation and maintain productivity.
Solution Approach 2:
The sealing elements are designed to close the housing partially rather than completely, leaving controlled gaps or discharge paths. This partial closure action prevents material accumulation that would reduce productivity while maintaining sufficient housing closure for safety and operational reliability.
3Productivity
If the sealing element slides on the milled surface to ensure clean removal, then complete material loading is achieved, but wear increases and fuel consumption rises
Solution Approach 1:
The sealing elements are made height-adjustable, allowing the operator to optimize their position based on operating conditions. In complete loading mode, the elements slide on the milled surface to ensure clean removal. In partial loading mode, the elements can be raised to reduce contact and friction, thereby reducing fuel consumption and wear while maintaining effective material loading.
4Adaptability or versatility
If a height-adjustable sealing element is used for partial material loading, then operating flexibility is improved, but the system complexity increases
Solution Approach 1:
The sealing system is divided into multiple independent sealing elements, each with its own adjusting device. This segmentation allows each element to be adjusted independently for its specific function, providing operating flexibility without requiring a single complex adjustable mechanism for the entire sealing system.
Solution Approach 2:
The sealing elements serve multiple functions: they close the housing to prevent material escape, control material discharge for different loading modes, and can be adjusted to different heights. This multi-functionality reduces the need for separate components for each function, thereby reducing overall system complexity while maintaining operating flexibility.
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
The invention relates to a self-propelled construction machine, in particular a road milling machine, recycler or stabilizer, which has a machine frame 1 and a milling drum 4, which is arranged in a milling drum housing 5, which has a sealing device 11, which has a sealing element 12 arranged in the working device 10 of the construction machine behind the milling drum 4 for closing the milling drum housing 5, an adjusting device 16 for adjusting the height position of the sealing element 12 in relation to the milling drum and a control device 17 for controlling the adjusting device 16 of the sealing element 12.The construction machine is characterized by the fact that the sealing device 11 has a scraper element 18 which is pivotably arranged on the sealing element 12 such that the scraper element 18 rests on the milled material, so that when the construction machine is advanced, the scraper element 18 is pulled over the milled material and pivoted relative to the milling drum depending on the height of the milled material. The height position of the at least one sealing element 12 is adjusted depending on the pivot position of the scraper element 18 such that, when the construction machine is advanced, the pivot position of the scraper element lies within a predetermined pivot range.