Chain scission and scraper plate fracture electronic alarming device for cleaning mechanism of coal feeder

Abstract

The invention relates to a chain scission and scraper plate fracture electronic alarming device for a cleaning mechanism of a coal feeder. Two proximity switches which are arranged in parallel are arranged on the two sides of a cleaning chain respectively and are used for receiving a pulse motion signal of a cleaning scraper plate and transmitting the pulse motion signal to a control circuit; and the control circuit is used for outputting an alarming signal. The working conditions of the chain and the scraper plate of the cleaning mechanism of the coal feeder can be dynamically detected on line, so that a user can be timely reminded to overhaul the cleaning mechanism in time once abnormal conditions occur; therefore, accidental shutdown is prevented, improvement on the integral reliability of the coal feeder is facilitated, and the probability and the time of the accidental shutdown can be effectively reduced.

Description

technical field [0001] The invention relates to an alarm device, in particular to an electronic alarm device for a broken chain of a cleaning mechanism of a coal feeder and a broken scraper. Background technique [0002] The current main unit of large-scale thermal power equipment in my country basically adopts the direct blowing powder feeding method, that is, the computer DCS system in the central control room calculates and gives the coal quantity command according to the unit load situation, and the coal feeder will send coal into the coal according to the specified coal flow rate. Coal mill, and then directly sprayed into the furnace for combustion under the action of wind pressure. At present, each unit of a thermal power station is generally equipped with six coal feeders, and any failure of any one of them will cause a power loss of tens of thousands to hundreds of thousands of kilowatts of power generation. Therefore, the coal feeder of the powder feeding system of ...

AI Technical Summary

Problems solved by technology

Because the broken chain or the broken scraper on site will inevitably cause the accumulation of scattered coal to be too high, which will cause the conveyor belt of the coal feeder to fail to operate normally and eventually lead to failure and shutdown

[0003] At present, the shear pin at the output drive shaft sleeve is disconnected (over-torque mechanical protection method) and the drive motor is stopped by over-current to protect the cleaning mechanism of the coal feeder, so as to reduce the possible cleaning chain breakage and scraper breakage. Scraper breakage or even chain breakage that has occurred cannot remind the user to carry out maintenance in time, so it is difficult to avoid downtime due to failure

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