Encoder cross-comparison device of refueling machine

Abstract

The invention relates to an encoder cross-comparison device of a refueling machine, and belongs to the technical field of nuclear power station maintenance. The device comprises n encoders, a shaft coupling, a DEVICENET bus, a DEVICENET module, a CPU module, a power supply module, an industrial control computer and fibers. A fault encoder can be determined from the multiple encoders by cross comparison in the offline condition, and the enterprise cost can be reduced a lot; more sound encoders can be recovered and used, the maintenance time is reduced a lot, and a nuclear power maintenance staff receives radiation in less time; a fault of the single encoder can be also determined, and the sound encoder can be recovered; and power supply for a tester is flexible, and the whole system can beerected simply onsite. The device can help new staff of nuclear power and working-group members of a partner enterprise master basic skills including IP address setting of the CPU module, online download of configuration software and DEVICENET communication protocol based encoder maintenance.

Description

technical field [0001] The invention belongs to the technical field of maintenance of nuclear power plants, and in particular relates to a cross-comparison device for an encoder of a loading and unloading machine. Background technique [0002] The loading and unloading machine is the key equipment in the refueling (nuclear fuel assembly) overhaul of the nuclear power unit. The encoder is the sensor for the loading and unloading machine to judge the installation position of the nuclear fuel assembly. Whether the grating of the encoder is continuous and whether the communication is normal affects whether the nuclear fuel can be accurate. installed in the correct position of the reactor pressure vessel. Before the emergence of this encoder cross-comparison device, during refueling and overhaul of nuclear power units, if there was a fault in the comparison value of the loading and unloading machine encoder, it could only be eliminated by replacing two mutually redundant encoders...

AI Technical Summary

Problems solved by technology

Before the emergence of this encoder cross-comparison device, during refueling and overhaul of nuclear power units, if there was a fault in the comparison value of the loading and unloading machine encoder, it could only be eliminated by replacing two mutually redundant encoders at the same time, and it was impossible to accurately judge which faulty encoder

The disadvantages are: 1. The price of the encoder is relatively high, and if the encoder has a comparison value failure, two redundant encoders must be replaced at the same time, which brings a large maintenance cost to the company

2. The time for refueling and overhaul of nuclear power units is very precious. Replacing the encoder takes up more time for overhaul, and at the same time increases the time for maintenance personnel to be exposed to radiation

[0003] At present, peer power plants, loading and unloading machines, and encoder equipment manufacturers do not have effective encoder quality evaluation devices, and relevant research is urgently needed

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