Angled Wiper Strip Cutting Elements for Road Milling
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Solution Overview
Problem
Existing scraper strips for road milling machines are inefficient in breaking up unevenness in the milled road surface, requiring high cutting forces and reducing the service life of cutting elements.
Innovation Solution
A scraper strip with a carrier having cutting elements arranged at an angle to the longitudinal axis, forming a zigzag or sawtooth cutting edge, which allows for better cutting performance by applying force components both in and transverse to the feed direction, reducing the required cutting force and increasing the service life of the cutting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If cutting elements are arranged parallel to the longitudinal axis of the carrier, then the structure is simple and easy to manufacture, but the cutting force required is high and the service life of cutting elements is reduced
Solution Approach 1:
The cutting elements are arranged at an angle to the longitudinal axis of the carrier, creating an asymmetric zigzag or sawtooth pattern. This asymmetric arrangement allows the cutting edge to engage unevenness in the milled surface more effectively, reducing the cutting force required and extending the service life of the cutting elements while maintaining manufacturing simplicity
2Duration of action of moving object
If cutting elements are arranged at an angle to the longitudinal axis, then the cutting force is reduced and service life is extended, but the manufacturing complexity increases
Solution Approach 1:
The carrier is divided into multiple cutting element receptacles, each holding a cutting element at a specific angle. This segmentation allows the complex angled arrangement to be achieved through modular assembly rather than complex monolithic manufacturing, reducing the overall device complexity while maintaining the benefits of angled cutting elements
3Force
If cutting elements are arranged at an angle to the longitudinal axis, then the cutting force is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
Each cutting element receptacle is designed with specific local geometric features that guide the cutting elements into the correct angled position. This local quality approach ensures that only the critical cutting edge positioning requires high precision, while other parts of the carrier can be manufactured with standard tolerances, reducing overall manufacturing precision requirements
Data Source
Figure 1
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AI summary
The application relates to a scraper blade (20) for a scraper plate (68) of a road milling machine, comprising a carrier (10) having a front and a rear mounting surface (17), wherein the carrier (10) has a cutting element receptacle (13), wherein cutting elements (30) are held in or on the cutting element receptacle (13) in a series along a longitudinal axis (L) extending in the width direction of the carrier (10), and wherein the cutting elements (30) have a cutting edge (35.1) which transitions directly or indirectly into a rake face (35). To improve the work result, it is provided that, at least in some areas, the cutting edge (35.1) of at least some of the cutting elements (30) is not positioned parallel to the longitudinal axis (L).