An optical fiber monitoring device and monitoring method for the vibration of a shearer drum

Abstract

The invention discloses a coal mining machine roller vibration optical fiber monitoring device and a monitoring method. The device comprises piezoelectric ceramic, a fixed iron ring, a movable iron ring, a multi-turn coil, a magnetostrictive material and a fiber grating sensor. When the coal mining machine roller works, the vibration of the roller induces the fixed iron ring and the movable iron ring to move relatively and extrude the piezoelectric ceramic, the extruded piezoelectric ceramic forms voltage at an input end and an output end of the multi-turn coil, current circulates in the multi-turn coil and the coil is excited to generate a magnetic field, the magnetic field induces the magnetostrictive material to deform and the deformation is accurately measured by the fiber grating sensor, and finally vibration information of the coal mining machine roller is obtained through backstepping according to a measurement result of the fiber grating sensor. The device has the advantages ofsimple structure, low cost, high accuracy and the like.

Description

technical field [0001] The invention relates to the technical field of mechanical vibration monitoring, in particular to a shearer drum vibration optical fiber monitoring device and a monitoring method. Background technique [0002] With the continuous improvement of safety requirements for coal mine mining, the performance of fully mechanized mining equipment is the premise to ensure safe mining during coal mine mining. Wear and tear, the shearer will produce severe vibration. When the vibration exceeds a certain range, it will affect the working life of the shearer, and if it is serious, it will cause a production safety accident. For large-scale rotary machinery such as the shearer drum, the wear of the rotary parts can be analyzed through the vibration signal. Once the safety standard is exceeded, it must be replaced in time to avoid accidents. Therefore, the vibration monitoring, vibration analysis and control of the shearer drum are of great significance. important me...

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Problems solved by technology

[0003] Traditional shearer drum vibration monitoring methods mostly use indirect methods for measurement, which cannot achieve on-line measurement, and the measurement accuracy is low

CN106225906A discloses a shearer drum vibration monitoring device and method based on optical fiber sensing. The monitoring device is composed of a fixed monitoring device and a rotating monitoring device. (1) The rotating monitoring device is composed of a first light source module, a monitoring optical fiber ring, a photoelectric The conversion module is composed of a single-layer wire coil, and the vibration of the shearer drum is used to induce and monitor the polarized light in the fiber ring to produce birefringence. The conversion of drum vibration signal to coil current signal, but the main problem of this method is that both the first light source module and the photoelectric conversion module need to be powered by a separate explosion-proof power supply, and the difference between the vibration signal of the shearer drum and the birefringence induced Linear relationship and extremely weak signal strength. In addition, it is difficult to install the first light source module, photoelectric conversion module and supporting power supply at the same time in the narrow area between the planetary gear reducer of the coal mining machine drum and the outer wall of the drum.

(2) The fixed monitoring device introduces terbium-doped optical fiber as the sensing optical fiber, and installs the terbium-doped optical fiber along the axis of the single-layer wire coil to realize the change of the coil current signal to the optical signal in the fixed monitoring device, but the main point of this method is The problem is the low sensitivity, the Verdet constant of terbium-doped fiber is only 10 -6 rad / A level, in the shearer drum vibration monitoring, this weak signal is easily overwhelmed by the environmental noise

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