Press mounting method for generator stator core stretching screw

Abstract

The invention relates to a press mounting method for a generator stator core stretching screw. The invention belongs to the technical field of hydraulic generators. The generator stator core laminations are pressed together by a stretching screw. The method comprises the following steps: (1) test press mounting of stretching screw: measuring the actual length of the stretching screw without pressurizing, carrying out test press on the stretching screw by using a stretching screw measuring sleeve, measuring the elongation of the stretching screw while pressurizing, and recording the pressure reference value; and (2) stretching quantity measurement and press mounting of stretching screw: measuring the initial distance between the lower end surface of the stretching screw and the upper plane of the lower measuring rib by using a stretching screw measuring tool, recording while prepressing and totally pressing, measuring the distance between the lower end surface of the stretching screw and the upper plane of the lower measuring rib when pressurizing to the pressure reference value, and measuring while pressurizing until the requirement is satisfied, thereby realizing press mounting. The invention has the advantages of simple technique, convenient operation, accurate and reliable data, favorable core press mounting effect and the like.

Description

technical field [0001] The invention belongs to the technical field of hydroelectric generators, and in particular relates to a press-fitting method for a generator stator iron core tightening screw. Background technique [0002] At present, the pressure value that needs to be applied in the press-fit process is calculated according to the force value of each tension screw provided by the design during the press-fit process of the stator core, but in the actual press-fit process, the parameters of hydraulic tensioners from different manufacturers Different, and this parameter value is the test value under ideal conditions, it does not take into account the external friction resistance in the actual working process, so according to the calculated pressure value, the tightening screw will inevitably fail to meet the design requirements The amount of stretching will cause technical problems such as not being able to ensure the pressure between the core pieces. Contents of the...

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Problems solved by technology

[0002] At present, the pressure value that needs to be applied in the press-fit process is calculated according to the force value of each tension screw provided by the design during the press-fit process of the stator core, but in the actual press-fit process, the parameters of hydraulic tensioners from different manufacturers Different, and this parameter value is the test value under ideal conditions, it does not take into account the external friction resistance in the actual working process, so according to the calculated pressure value, the tightening screw will inevitably fail to meet the design requirements The amount of stretching, resulting in technical problems such as poor guarantee of the pressure between the core pieces

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