Processing method for special-shaped curved-surface steel plate washers during on-site assembling and shrink fitting of high-rating generator rotor
A generator rotor, on-site assembly technology, applied in metal processing equipment, manufacturing tools, milling machine equipment details, etc., can solve the problems of uneven force on the overall structure of the rotor, uneven gap between the yoke key and the keyway plate, etc. Low, simple processing method, easy to operate
Active Publication Date: 2015-07-15
CHINA GEZHOUBA GROUP CO LTD
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Problems solved by technology
However, due to the welding of the keyway plate and the deformation of the yoke after heating, the yoke key is inclined or twisted in the keyway plate, and the gap between the yoke key and the keyway plate is uneven. After adding equal-thickness steel pads, the overall structure of the rotor will be unevenly stressed.
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[0017] The hydro turbine unit involved is a large Alstom hydro turbine unit, and the heat-sleeved special-shaped curved surface gasket of the rotor of the hydro turbine unit is processed. The specific implementation method is as follows:
[0018] (1) According to the technical requirements, measure the gap value 4 of multiple sections within the range of length L between the rotor yoke key 3 and the keyway plate 2; determine the plane gasket 6 to be processed according to the measured gap value between the yoke key 3 and the keyway plate 2 Thickness δ;
[0019] In this project, the gap values of 14 measuring points in 7 sections between the rotor yoke key and the keyway plate were measured. The measured gap values of each measuring point are shown in Table 1. According to the measured gap value, the thickness of the plane gasket to be processed is selected as 12mm.
[0020] (2) According to the measured gap value 4 of each point of the multiple sections between the rotor ...
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The invention provides a processing method for special-shaped curved-surface steel plate washers during on-site assembling and shrink fitting of a high-rating generator rotor. According to the invention, cushion blocks with different heights are installed on a working platform, and the height of each cushion block is determined according to actually measured values of gaps between a magnet yoke and a keyway plate; flat washers are placed on the cushion blocks, the flat washers and countersunk bolts of the cushion blocks are screwed and positioned on the working platform, the flat washers deform with stress to abut to all the cushion blocks and the working platform, then a milling cutter used for processing the flat washers is used to flatten the top of the deformed washers through milling, and the milled washers are the special-shaped curved-surface washers with different thicknesses for shrink fitting of the rotor. According to the invention, the special-shaped curved-surface washers with different thicknesses are processed by using conventional planar processing means on the working platform; the method is simple, is easy to operate, needs low cost and overcomes great technical problems in installation of a hydro-generator; and the method is an economic and practicable processing method for special-shaped curved-surface steel plate washers.
Description
technical field [0001] The invention relates to the measurement of the actual unequal-thickness gap value between the rotor keyway plate and the yoke key in the rotor assembly process and the gasket processing method, in particular to a method for processing unequal-thickness special-shaped curved surface steel gaskets by using a working platform and using conventional plane processing means Methods. Background technique [0002] The rotor of a large hydro-generator is mainly composed of a disc support, a keyway plate, a gasket, a yoke key, a yoke, and a magnetic pole. The keyway plate is welded to the disc support, the yoke key is welded to the yoke, and the magnetic The yoke key is embedded in the keyway plate, and a 3mm thick plane gasket is sandwiched between the yoke key and the keyway plate. When the generator is running, the rotational force of the yoke is transmitted to the disc support through the yoke keys, gaskets, and keyway plates. Generally, the separation sp...
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IPC IPC(8): B23C3/00
Inventor 江小兵江晨程志华
Owner CHINA GEZHOUBA GROUP CO LTD