Cone Crusher Locking Nut Assembly with Jackscrews
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional cone crushers require significant mechanical effort to securely fasten the mantle to the head assembly due to the large turning effort needed to tighten the locking nut, making the installation and replacement process cumbersome and potentially damaging.
Innovation Solution
A locking nut assembly comprising an inner nut with axial bores and jackscrews, where the inner and outer nuts are staged relative to each other, allowing incremental tightening of jackscrews to exert a downward force on a torch ring or mantle, reducing the need for excessive torque and preventing damage to the jackscrews during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional locking nut is used to secure the mantle, then the mantle can be firmly attached to the head assembly, but excessive turning effort is required which makes installation cumbersome and potentially damaging
Solution Approach 1:
The locking nut is divided into an inner nut and an outer nut that function independently. The inner nut engages with the head assembly threads while the outer nut engages with the inner nut threads. This segmentation allows the jackscrews to push the inner nut against the mantle without requiring excessive torque on a single large locking nut, thereby reducing turning effort while maintaining locking force.
Solution Approach 2:
The jackscrews act as intermediary elements between the nuts and the mantle. Instead of applying force directly through a large locking nut requiring high torque, the jackscrews convert the threading action into linear pushing force against the mantle. This intermediary mechanism transforms rotational motion into direct axial force, reducing the turning effort needed while achieving the same locking effect.
2Strength
If high torque is applied to tighten the locking nut, then adequate locking force is achieved, but the jackscrews may be damaged during operation
Solution Approach 1:
By segmenting the locking mechanism into inner and outer nuts with separate functional roles, the system distributes mechanical stresses more evenly. The jackscrews only need to overcome thread friction and apply moderate pushing force rather than withstanding the full torque load, reducing stress concentrations that could lead to damage during operation.
Solution Approach 2:
The locking mechanism transitions from a static high-torque application to a dynamic progressive tightening process. The jackscrews are tightened incrementally against the mantle, allowing the system to self-adjust and distribute loads dynamically. This progressive approach prevents sudden stress spikes that could damage the jackscrews while achieving the required locking force.
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
Facilitates easier and safer installation and replacement of mantles by distributing the locking force evenly, reducing the mechanical effort required and minimizing the risk of damage to the jackscrews, while maintaining a secure locking mechanism.
Implementation Method 1
The threaded interaction between the inner and outer nuts allows the outer nut to move relative to the inner nut upon rotation of the outer nut relative to the inner nut
Implementation Method 2
The threaded interaction between the annular bores of the inner nut and the jackscrews allow the jackscrews to be rotated and moved relative to the inner nut
Implementation Method 3
Each jackscrew is rotated further such that the torch ring is moved away from the inner nut and the set of jackscrews combine to exert a downward force on the torch ring which is opposed by the reactionary locking force between the inner nut and the head assembly
Data Source
AI summary
A two-piece locking nut assembly for securing a mantle to a head assembly of a cone crusher. The two-piece locking nut assembly includes an inner nut and an outer nut. The inner nut includes a set of axial bores that each receive a jackscrew. Once the locking nut assembly is in position on the head assembly, the series of jackscrews are tightened to exert a force on the mantle that is counteracted by forces through the inner nut and into the head to create a locking force between the locking nut assembly and the head assembly. The outer nut is turned along the inner nut to hold the locking nut assembly in place. Once the outer nut is moved into position, the jackscrews are removed such that the outer nut continues to apply the locking force between the mantle and the head through the locking nut assembly.