Arc-like Member Positioning Jig Radial Adjustment
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Solution Overview
Problem
The existing positioning jig for arc-like members in turbines faces difficulties in moving the blade ring to a desired position due to increased force required to rotate the nut, making it hard to accurately position the arc-like member without deformation, which affects gap measurements and assembly.
Innovation Solution
A positioning method and jig that utilize a jack and rod system to move a protruding part of the arc-like member radially with respect to a reference member, allowing for easy positioning by adjusting the jack's position between wall portions and using a pressing piece to apply force via a rod, enabling movement in both radial directions and accommodating deformation adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a screw shaft and nut mechanism is used to apply load radially inward to the blade ring, then the blade ring can be positioned, but the force required to rotate the nut increases significantly making it difficult to move the blade ring to the desired position
Solution Approach 1:
A hydraulic jack is introduced as an intermediary device between the positioning jig and the blade ring. The jack converts hydraulic pressure into mechanical force, applying the necessary radial load to the blade ring without requiring direct manual rotation of a high-force nut mechanism. This mediator handles the high force requirement while keeping the operation simple through hydraulic control.
Solution Approach 2:
The manual screw shaft and nut mechanism is replaced with a hydraulic jack system. Instead of relying on mechanical threading to generate and control the radial load, the invention uses hydraulic pressure to generate the necessary force. This substitution eliminates the need to rotate high-strength fasteners manually, significantly improving ease of operation while maintaining the required positioning force.
2Measurement precision
If the arc-like member is deformed due to deflection by own weight, then gap measurements become inaccurate, but suppressing deformation requires complex positioning equipment
Solution Approach 1:
The positioning jig, including the hydraulic jack, is set up and configured before the actual gap measurement process. The blade ring is positioned and the hydraulic jack is adjusted to apply the correct radial load in advance, ensuring the blade ring maintains its operational shape during measurement. This preliminary positioning prevents deformation-related measurement errors without requiring complex real-time correction systems.
Solution Approach 2:
The hydraulic jack system is designed to self-regulate the radial load on the blade ring. By positioning the jack between specific structural elements (the inner peripheral surface of the casing and the outer peripheral surface of the blade ring), the system automatically maintains the blade ring in its operational configuration throughout the measurement process, eliminating the need for additional complex stabilization equipment.
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
This solution allows for efficient and accurate positioning of the arc-like member, reducing the risk of deformation and ensuring precise gap measurements, facilitating easier assembly and disassembly of turbine components.
Implementation Method 1
a first wall portion and a second wall portion connected to each other are arranged, such that the reference member is positioned between the first wall portion and the second wall portion, the jack is arranged between the reference member and one of the first wall portion or the second wall portion, and the jack is operated to move the protruding part with respect to the reference member by the pressing piece mounted on the first wall portion via the rod
Data Source
AI summary
A positioning method of an arc-like member according to at least one embodiment of the present invention includes a step of moving a protruding part disposed at a circumferential end of the arc-like member in a radial direction with respect to a reference member positioned on a radially outer side as viewed from the circumferential end of the arc-like member. In the step of moving the protruding part, a wall portion is arranged on a radially outer side or a radially inner side with respect to the reference member, a jack is arranged between the wall portion and the reference member, and the jack is operated to move the protruding part with respect to the reference member by the pressing piece mounted on the wall portion via a rod.