A loading and unloading machine encoder cross comparison device

Abstract

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. The device includes n encoders, shaft coupling, base, DEVICENET bus, DEVICENET module, CPU module, power supply module, industrial computer and optical fiber. In the off-line state, the faulty encoder can be judged by cross-comparison among multiple encoders, which can greatly save the cost of the enterprise, increase the recycling of intact encoders, save a lot of maintenance time, and reduce the radiation exposure time of nuclear power maintenance personnel; It can also realize the fault judgment of a single encoder, and can realize the recovery of the intact encoder; the power supply of the test device is flexible, and the whole system is easy to set up on site. The whole device can help new nuclear power employees and working group members of cooperative units master basic skills such as CPU module IP address setting, configuration software online and download, and encoder maintenance based on DEVICENET communication protocol.

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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