Cutting Tool Locking Collar Wedge Compression
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Solution Overview
Problem
Rotating cutting devices in mining and tunneling applications experience premature deterioration due to repeated impact blows, leading to gaps between mating parts and a rocking motion, making repairs impossible and requiring frequent replacements, resulting in machine downtime and reduced efficiency.
Innovation Solution
A cutting tool system featuring a locking collar with a socket for the driving shaft, a bit attachment member with a pin receptacle, and fasteners that impart a wedging action to compress the locking collar, preventing rotational movement and securing the retainer plate to the shaft, thereby preventing rocking motion and enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cutting heads are used with simple locking mechanisms, then the device complexity is low, but the reliability deteriorates due to gaps developing between mating parts under repeated impact blows
Solution Approach 1:
The locking collar is divided into multiple segments that can independently compress radially inwardly, allowing each segment to adapt to impact forces and maintain secure locking without requiring an overly complex monolithic structure
Solution Approach 2:
The locking collar transitions from a static rigid structure to a dynamic compressible structure that can radially inwardly compress under impact loads, maintaining reliable connection while absorbing mechanical shocks
2Duration of action of stationary object
If conventional rigid locking collars are used, then the device complexity is low, but the durability worsens due to rocking motion and gaps under repeated impact
Solution Approach 1:
The locking collar is designed to dynamically compress radially inwardly when subjected to repeated impact blows, preventing gap formation and rocking motion that would otherwise lead to premature deterioration and extended service life
Solution Approach 2:
The locking collar's radial dimension is made changeable through compressibility, allowing it to adjust its physical state under load to maintain secure engagement and prevent deterioration from rocking motion
3Stability of the object's composition
If simple fastening methods are used, then the ease of manufacture is high, but the stability deteriorates due to relative rotational movement between components
Solution Approach 1:
The locking collar is segmented to allow independent radial compression while maintaining rotational stability through the combined action of multiple segments and pins, achieving stable connection without overly complex assembly
Solution Approach 2:
Pins are introduced as intermediary elements within the grooves to prevent relative rotational movement between the locking collar and bit attachment member, providing rotational stability while maintaining manufacturing simplicity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents relative rotation between the locking collar and the bit attachment member, reducing wear and tear, increasing the lifespan of the cutting tool system, and minimizing downtime by maintaining a secure grip on the driving shaft, thus enhancing operational efficiency and profitability.
Implementation Method 1
The fasteners are constructed to secure the retainer plate directly to the locking collar and to the driving shaft, and to impart a wedging action between the tapering outer surface and the tapering inner surface that causes inward compression of the locking collar
Data Source
AI summary
A cutting tool system is provided that includes a locking collar and a bit attachment member. The locking collar is compressible radially inwardly and has a tapering outer surface. The bit attachment member has a tapering inner surface constructed to receive and interface with the outer surface of the locking collar. According to an embodiment, a first groove in the outer surface of the locking collar is alignable with a second groove of the bit attachment member to form a perimeter of a pin receptacle in which is pin is insertable to prevent relative rotation between the locking collar and the bit attachment member. According to another embodiment, the cutting tool system further includes a retainer plate and fasteners constructed to secure the retainer plate directly to the locking collar and to the driving shaft, and to cause inward compression of the locking collar.