Three-row roller type turntable bearing health monitoring device based on fiber bragg grating

Abstract

The invention provides a three-row roller type turntable bearing health monitoring device based on a fiber bragg grating. The three-row roller type turntable bearing health monitoring device comprisestwo fiber bragg grating temperature sensors, a plurality of fiber bragg grating strain sensors and a demodulator, a plurality of rectangular grooves are formed in the upper end face of the lower ring, the axes of the rectangular grooves are arranged in the radial direction of the lower ring, the number of the fiber bragg grating strain sensors is the same as that of the rectangular grooves, and the fiber bragg grating strain sensors correspond to the rectangular grooves in a one-to-one mode. The fiber bragg grating temperature sensors are arranged outside the three rows of roller type turntable bearings; the fiber bragg grating strain sensors are divided into a group A and a group B. The fiber bragg grating strain sensors in the group A and one fiber bragg grating temperature sensor are connected in series to form a first path, the fiber bragg grating strain sensors in the group B and another fiber bragg grating temperature sensor are connected in series to form a second path, and thefirst path and the second path are connected into the demodulator in parallel. According to the invention, online monitoring of the three-row roller type turntable bearing can be realized.

Description

technical field [0001] The invention relates to the field of bearing health monitoring, in particular to a fiber grating-based three-row roller turntable bearing health monitoring device. Background technique [0002] The three-row roller slewing bearing is the core component of large-scale rotating equipment. It has a huge structural size and high price, and plays the role of two-part rotation and load transmission. Harsh working environments, such as large shocks, eccentric loads, heavy loads, and variable loads, have extremely high requirements on the load-carrying capacity, safety, and reliability of three-row roller slewing bearings. Once the three-row roller slewing bearing fails, it will affect the normal operation of the main equipment, which will easily lead to major safety accidents, and the maintenance of the three-row roller slewing bearing is difficult, the replacement cycle is long, the cost is high, the progress of the project is affected, and huge economic lo...

AI Technical Summary

Problems solved by technology

Once the three-row roller slewing bearing fails, it will affect the normal operation of the main equipment, which will easily lead to major safety accidents, and the maintenance of the three-row roller slewing bearing is difficult, the replacement cycle is long, the cost is high, the progress of the project is affected, and huge economic losses are caused.

[0003] The three-row roller slewing bearing is mainly composed of three rows of rollers, inner and outer rings and spacers. The upper and lower end faces of the inner and outer rings are connected with the upper and lower end faces of the supporting structure by high-strength bolts. There is no gap between the end faces and the installation space is limited; Conventional electrical sensing elements have short service life and are easily affected by the environment, so they cannot achieve long-term and stable online health monitoring of three-row roller slewing bearings

Most structural damage states in the engineering field are mainly monitored by technologies such as resistance strain gauges. Resistance strain gauges are corroded, seriously drifted, have strict requirements for measuring circuit layout, poor durability, and are greatly affected by electromagnetic interference.

These shortcomings cannot realize the long-term online monitoring of the health status of the three-row roller slewing bearing structure

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