Sealing tooth scraping tool

Abstract

The invention provides a sealing tooth scraping tool which comprises a cutting tool, a drive unit and a positioning mechanism, wherein, the cutting tool is composed of a milling cutter and a group of cutter shafts, and the cutter shafts are equipped with upper locking nuts and lower locking nuts for adjusting the position of the milling cutter so that the cutting edge of the milling cutter corresponds to sealing teeth; the length of the cutter shafts changes in a constant gradient manner, the length gradient is equal to the distance between two adjacent rows of sealing teeth, and the cutter shafts are sequentially used for respectively machining the sealing teeth when in use; the positioning mechanism comprises a pair of depended wheels and a support; the support is provided with a horizontal plate and a vertical plate, and the bottom end surface of the vertical plate is a positioning datum plane; the depended wheels are distributed on the left side and right side of the vertical plate; the left depended wheel is fixed on a sliding seat; an adjusting screw is used for adjusting the distance between the sliding seat and the cutter shafts so as to determine the engagement of the milling cutter; the right depended wheel is fixed on a sliding block and is assembled on a sliding mechanism which is composed of a sliding rail, the sliding block and a screw rod; and the outside depended wheel is tightly attached to a workpiece by screwing the screw rod so that the dynamic relative position between the tool and the workpiece can remain stable.

Description

technical field [0001] The invention relates to a steam seal gear of a steam turbine, in particular to a scraping tool for the steam seal gear, which is used for repairing and scraping the tip of the steam seal gear and registering the radial clearance between a rotor and a stator when a steam turbine unit is installed on site. Background technique [0002] The radial seal gap between the diaphragm and the seal body has an important impact on the safe operation and economy of the steam turbine unit. If the gap is too large, the steam leakage will be large, the efficiency of the unit is low, and it is uneconomical; if the gap is too small, the rotor and the stator will be easily damaged. A collision will endanger the safety of the unit, so the dimensional accuracy of the gap is highly required. The gap is determined by the height of the seal teeth, and the height of the seal teeth is precisely controlled by cutting the tip of the seal teeth, so as to register the gap. [000...

AI Technical Summary

Problems solved by technology

[0004] In addition, under the action of steam flushing and cavitation, the seal teeth will also be damaged, and the gap will become larger and need to be replaced. There is also the problem of re-registration of the gap

Images