Early fault detection system of low-speed heavy-load machine

Abstract

The invention relates to an early fault detection system of a low-speed heavy-load machine. According to the technical scheme, the signal output end 1a of a pressure vibration sensor (1) is connected with the signal input end 2a of an amplifier (2); the signal output end 2b of the amplifier (2) is connected with the signal input end 3a of an ultra-low-frequency phase-locked loop (3); the signal output end 3b of the ultra-low-frequency phase-locked loop (3) is connected with the analogue input end 4a of an analogue-digital converter (4); the digital output end 4b of the analogue-digital converter (4) is connected with a serial port com1 of a computer (5); a piezoelectric element (9) of the pressure vibration sensor (1), a mass block (8) and a circuit board (7) are fixed on the upper plane of a base (11); a housing (6) is fixed at the upper part of the base (11); a band-pass filter (12) is connected with a low-pass filter (14) through a high-pass filter (13); the low-pass filter (14) is connected with the amplifier (2); the band-pass filter (12) is connected with the piezoelectric element (9). The early fault detection system has the characteristics of capability of conveniently extracting weak impact signals, small number of sampling points and accuracy in fault judgment.

Description

technical field [0001] The invention belongs to the technical field of fault diagnosis of rotating machinery, and in particular relates to an early fault detection system of low-speed heavy-duty machinery. Background technique [0002] Low-speed heavy-duty machinery is a type of rotating machinery with a speed of less than 60rpm and a large load capacity, such as blast furnace rotary distributors, continuous casting ladle turrets, converter rotary support mechanisms and other equipment. The outstanding feature of this type of equipment is that the operating conditions of the transmission mechanism are typically intermittent, and they are always in the transitional state of starting and braking. When the bearing has defects such as pitting, cracks, and peeling, the vibration signal will generate a weak impact signal that can represent early failures. Due to the special working conditions of low-speed and heavy-duty machinery, the vibration signal is not periodic and the ampli...

AI Technical Summary

Problems solved by technology

[0003](1) Due to the low speed of the equipment to be diagnosed, the impact amplitude of the fault signal is very small, and the sensitivity of the acceleration sensor used in the existing fault detection system is very limited , coupled with the influence of environmental noise, it is difficult to effectively collect the vibration shock signal of the equipment to be diagnosed;

[0004](2) Due to the low speed of the equipment to be diagnosed, the time interval of each fault shock signal is long, and the existing fault detection system needs to collect a large amount of vibration data for fault diagnosis

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