Tooth System Stepped Configuration Adapter Wear
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Solution Overview
Problem
Existing tooth systems used in dredging operations face challenges with adapter wear, leading to instability and cumbersome replacement, which impairs the functioning of the cutter head due to fixed connections that do not allow for easy and efficient replacement of worn-out adapters.
Innovation Solution
The tooth system features a stepped configuration with slanting tooth base flange surfaces and adapter flange surfaces, including recesses and lands, providing stable support and allowing for easy replacement, along with a front cover that shields the adapter from abrasive influences and enhances stability, and locking mechanisms for secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adapters are fixedly connected to the draghead (e.g., by welding), then the connection is strong and stable, but the replacement of worn-out adapters becomes much more cumbersome and time-consuming
Solution Approach 1:
The adapter is divided into a replaceable adapter body and a fixed mounting structure on the draghead. The adapter body can be independently removed and replaced without affecting the mounting structure, enabling quick replacement while maintaining strong connection during operation.
Solution Approach 2:
The connection system transitions from a static fixed connection to a dynamic system that can switch between locked (during operation) and released (for replacement) states. The locking mechanism allows the adapter to be securely fixed during dredging operations but can be quickly released when wear occurs.
2Stability of the object's composition
If adapters are fixedly connected to the draghead, then the connection is stable, but the ease of replacement deteriorates compared to teeth which have expressly been carried out for easy replacement
Solution Approach 1:
The adapter assembly is segmented into a permanently mounted base structure and a removable adapter body. This segmentation allows the base to remain stably fixed to the draghead while the adapter body can be easily removed and replaced, combining the stability of fixed connection with the ease of replacement.
Solution Approach 2:
A locking mechanism acts as an intermediary between the adapter body and the mounting structure. This intermediary component provides stable connection during operation through locking engagement, but can be easily actuated to release the lock, facilitating quick replacement without compromising either stability or ease of replacement.
3Ease of manufacture
If the facing surfaces of adapter and tooth are flat, then the manufacturing is simple, but the accommodation of manufacturing imperfections is poor leading to instability
Solution Approach 1:
The facing surfaces are designed with locally varied geometry, incorporating stepped configurations with different levels and landing zones. These local variations in surface quality provide multiple contact points and tolerance zones that can accommodate manufacturing imperfections while maintaining overall stability, without requiring complete redesign of the entire surface.
4Device complexity
If the adapter and tooth have simple flat facing zones, then the device complexity is low, but the ability to accommodate manufacturing imperfections is poor
Solution Approach 1:
The facing zones incorporate localized stepped features and landing areas that provide tolerance accommodation. These local complexity additions are concentrated only where needed to handle manufacturing variations, while the overall configuration remains relatively simple and easy to manufacture.
Solution Approach 2:
The facing surfaces transition from two-dimensional flat planes to three-dimensional stepped configurations with multiple levels and depths. This dimensional change creates overlapping zones and multiple contact surfaces that can accommodate imperfections, improving reliability without significantly increasing overall device complexity.
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A tooth system for use in an earthmoving device, such as a dredging or mining device, comprises a tooth (1) and an adapter (2) onto which the tooth (1) is mounted in a detachable fashion, said tooth (1) comprising a longitudinally extending tooth web (6), a longitudinally extending tooth base (4) and a longitudinally extending tooth head (15) at a distance from the tooth base (4), said tooth base (4) and tooth head (15) also extending transversely with respect to the web (6), said adapter (2) comprising an adapter base (7) which is to be fixed onto an earthmoving device, such as onto the teeth bars of a draghead, and an adapter head (29), a longitudinally extending undercut cavity (10) being defined between the adapter base (7) and the adapter head (29), wherein the tooth base (4) is slidably fitted within the undercut cavity (10) and wherein the adapter head (29) is slidably fitted between the tooth base (4) and the tooth head (15) for mounting or dismounting the tooth (1) with respect to the front end (13) of the adapter (2), said adapter (2) comprising at least one zone which faces a correspondingly shaped zone of the tooth (1). At least one pair of correspondingly shaped facing zones of the adapter (2) and the tooth (1) comprises a stepped configuration.