Gyratory Crusher Retainer Tool for Thread-Safe Head Nut Mounting

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Solution Overview

Problem

Conventional methods for mounting and dismounting the inner crushing shell on a gyratory crusher require excessive force, often damaging the threads and posing safety risks to personnel.

Innovation Solution

A tool with a two-point tightening mechanism using actuators to apply a predefined force, coupled with a retainer assembly featuring a head nut and support ring, allows for secure mounting and dismounting without tilting the head nut.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If conventional hammering methods are used to mount and dismount the retainer assembly, then the mounting can be achieved, but the threads get damaged due to tilting or excessive forces

Engineering Contradiction:

Improvemounting capabilityVSAvoidthread integrity

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent replaces the conventional hammering mechanical system with a controlled actuating system. The tool includes an actuator that applies controlled force through a lever arm and spigot mechanism to the retainer assembly, eliminating the uncontrolled impact forces that damage threads while maintaining the capability to mount and dismount the assembly.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Ease of operation

If hammering methods are used to mount and dismount the crusher, then the retainer assembly can be secured, but personal safety is compromised due to excessive forces

Engineering Contradiction:

Improvemounting operationVSAvoidpersonal safety

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent substitutes the dangerous hammering operation with a controlled actuating system. The actuator applies force in a controlled manner through the lever arm mechanism, eliminating the uncontrolled explosive forces of hammering that pose safety risks to personnel while maintaining the operational capability to secure and remove the retainer assembly.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Strength

If conventional retaining mechanisms are used, then the crushing forces can be withstood, but the mounting and dismounting process damages the threads

Engineering Contradiction:

Improvecrushing force resistanceVSAvoidthread quality

Core Design Contradiction:

StrengthVSManufacturing precision

Solution Approach 1:

The patent replaces the damaging conventional mounting system with a controlled actuating system that preserves thread quality. The actuator and lever arm mechanism apply controlled forces during mounting and dismounting operations, preventing the tilting and excessive forces that would compromise thread integrity, while the retainer assembly itself maintains its ability to withstand crushing forces during operation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 enables safe and efficient mounting and dismounting of the retainer assembly, reducing the risk of thread damage and personal injury, while extending the lifespan of the head nut and minimizing replacement costs.

Implementation Method 1

a first and a second actuator mounted on the second plate at the periphery on opposite sides; a first and a second lever arm mounted on the first plate and mounted in connection to the first and the second actuator, respectively

Methodology Applied

Scientific EffectMechanical Force: Mechanical Force

Implementation Method 2

a first and a second lever arm mounted on the first plate and mounted in connection to the first and the second actuator, respectively, and wherein the lever arms comprising gripping surfaces intended to be arranged around the shaft

Methodology Applied

Scientific EffectLever: Lever

Implementation Method 3

a first plate being arranged on top of a second plate and wherein the plates being able to rotate in relation to each other

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS20250196151A1Retaining mechanism and tool for mounting and dismounting a crusher

Publication Date: 2025.06.19 SANDVIK SRP

AI summary

A tool for a retainer assembly of a gyratory crusher, the tool being arranged around a shaft of the crusher on top of the retainer assembly. The tool includes a first plate arranged on top of a second plate. A first and second actuator are mounted at a periphery of the second plate on opposite sides thereof. A first and second lever arm are mounted on the first plate and in connection to the first and second actuator. A first and a second movable spigot are mounted on the first plate in connection to the first and second lever arms. Pins are mounted on the lower side of the second plate in order for the tool to fit with the retainer assembly. A retainer assembly to be used in connection to the tool, and a method for using a tool in order to fasten a retainer assembly is also provided.