Crusher Rotor Worm Drive Locking for Safe Maintenance Rotation
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Solution Overview
Problem
Operators of material processing devices, such as impact crushers, face risks of injury or death due to unwanted rotation of the rotor during maintenance, as they may need to manually rotate the rotor to clear jams or replace components, which can result in uncontrolled rotation and exposure to hazards.
Innovation Solution
A rotor rotation device with a drive mechanism comprising a worm shaft and worm wheel, configured to selectively couple with the rotor, allowing controlled rotation while preventing back-driving, thereby ensuring safe and controlled operation during maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the rotor is made freely rotatable for maintenance purposes, then ease of operation is improved, but safety deteriorates due to risk of uncontrolled rotation and injury
Solution Approach 1:
A coupling mechanism acts as an intermediary between the drive mechanism and the rotor. This coupling can be selectively engaged or disengaged, allowing controlled rotation when needed while preventing uncontrolled rotation when the coupling is disengaged, thus resolving the safety concern while maintaining operational ease
2Object-affected harmful factors
If a locking mechanism is added to prevent unwanted rotation, then safety is improved, but device complexity increases
Solution Approach 1:
The worm drive mechanism provides self-locking functionality inherently through its geometric design. The worm gear geometry creates a self-blocking effect that prevents back-driving, eliminating the need for additional active locking mechanisms while maintaining safety
Solution Approach 2:
The patent extracts the essential locking function from a complex active control system and implements it through the passive geometric properties of the worm drive itself, simplifying the overall device while maintaining safety
3Object-affected harmful factors
If a worm drive mechanism is used to control rotation, then safety and control are improved, but ease of operation deteriorates due to selective coupling requirements
Solution Approach 1:
The worm drive mechanism's self-locking property automatically provides safety control without requiring complex active control systems or multiple operators, making the selective coupling process simpler and more intuitive
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 provides a safe and controlled means to rotate the rotor, preventing unwanted rotation and allowing for controlled speed and angular displacement, thereby reducing the risk of injury and facilitating maintenance tasks.
Implementation Method 1
the mutual configuration typically comprises a friction angle between a worm of the worm shaft and the worm wheel being larger that a lead angle of the worm
Data Source
AI summary
A rotor rotation device the rotor of a crusher includes a drive mechanism comprising a worm shaft and corresponding worm wheel. The worm wheel can selectively be coupled to said rotor in order to effect controlled rotation of the rotor, e.g. to facilitate maintenance of the crusher. The worm shaft cannot be back-driven by the rotor which allows the drive mechanism to serve as a lock against unwanted or uncontrolled rotation of the rotor.