Turbine Blade Removal Device with Angled Push Rod Guide
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Solution Overview
Problem
In rotary machines, such as axial flow compressors, turbine blades often become stuck to blade root grooves during long-term operation, making it difficult to remove them without damaging the blades during inspection or repair.
Innovation Solution
A removal device with a base restrained in one direction, a push rod, and a rod-moving mechanism that moves the push rod at an acute angle to guide it into the blade root groove, allowing the turbine blade to be removed without applying impact or causing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional removal methods are used on turbine blades stuck in blade root grooves, then the blade can be removed, but the turbine blade may be damaged during the removal process
Solution Approach 1:
The removal device is positioned and prepared in advance with the push rod aligned with the blade root groove before applying force. The base is restrained immovably in the axial direction first, then the push rod is moved along the inclination direction of the blade root groove, allowing controlled extraction without sudden impacts that could damage the blade.
Solution Approach 2:
The push rod acts as an intermediary tool between the rod-moving mechanism and the turbine blade. It transmits the removal force along the inclination direction of the blade root groove, distributing the stress evenly and preventing concentrated loads that could damage the blade structure.
2Productivity
If force is applied to remove stuck turbine blades, then the blade can be extracted from the groove, but impact forces may cause damage to the blade or surrounding components
Solution Approach 1:
The base is restrained immovably in the axial direction before the push rod applies force to the blade. This preliminary positioning ensures that when removal force is applied, it is directed precisely along the inclination direction of the blade root groove, preventing lateral impacts and enabling controlled, efficient extraction without damaging the blade or surrounding components.
Solution Approach 2:
The push rod serves as a mediator that translates the axial movement from the rod-moving mechanism into force applied along the inclination direction of the blade root groove. This intermediary structure allows controlled force application that maintains productivity while preventing impact damage through proper force distribution.
3Strength
If the blade root groove structure is used for secure attachment, then the turbine blade is firmly fixed during operation, but the same structure makes removal difficult without specialized tools
Solution Approach 1:
The removal device is positioned with its base restrained immovably in the axial direction before removal begins. The push rod is pre-aligned with the inclination direction of the blade root groove, allowing the device to exploit the existing groove geometry for controlled removal without requiring complex adaptive mechanisms.
Solution Approach 2:
The push rod acts as a simple intermediary that fits into the blade root groove and translates axial movement into extraction force along the groove's inclination direction. This simple intermediary structure enables removal of firmly attached blades without requiring complex tooling, maintaining low device complexity while effectively addressing the strong attachment.
Data Source
AI summary
A removal device includes a base, a push rod, a rod-moving mechanism and a rod guide. The base is restrained immovably in a first direction. The push rod can protrude from a front surface of the base toward a front side. The rod-moving mechanism is installed on the base. The rod-moving mechanism moves the push rod toward the front side. The rod guide is attached to the base. The rod guide guides movement of the push rod by the rod-moving mechanism in a second direction that forms an acute angle with respect to the first direction.