Fiber bragg grating stretching type device for monitoring tensile force of steel wire rope of mine lifting equipment and method

Abstract

The invention relates to a fiber bragg grating stretching type device for monitoring the tensile force of a steel wire rope of mine lifting equipment and a method. The device comprises a steel wire rope, an anti-skid wedged rubber ring and an encapsulation shell, wherein the anti-skid wedged rubber ring and the encapsulation shell are symmetrically buckled to fix the steel wire rope, two symmetrical elastic measuring bars are arranged in the encapsulation shell; fiber bragg gratings are adhered to the elastic measuring bars and connected in series to an optical fiber; the optical fiber is connected with one end of an optical fiber connecting head outside the encapsulation shell through an optical fiber lead-out hole; the optical fiber lead-out hole is internally sealed by a sealant; the other end of the optical fiber connecting head is connected with an optical fiber pigtail; the optical fiber pigtail is protected by armored protective rubber; the top and the bottom of the encapsulation shell are fastened with bolts, which penetrate through bolt holes, through clamp nuts. The device is simple in structure and convenient to mount, operate and use, adopts an advanced fiber bragg grating sensing technology, and has high electromagnetic interference resistance and high reliability; the wavelength values measured by the two fiber bragg gratings are weighted and averaged, so the measuring precision and sensitivity can be further improved and errors can be reduced.

Description

technical field [0001] The invention relates to the technical field of safety monitoring of coal mine equipment, in particular to an optical fiber grating tensile type mine hoisting equipment wire rope tension monitoring device and method suitable for hoisting equipment such as coal mine hoists and cages. Background technique [0002] In the process of coal mining, the safety of hoisting equipment is particularly important. The tension of the wire rope directly determines its life and mine hoisting safety. As an important part of mine hoisting equipment, the wire rope will be subjected to a lot of stress when the hoisting equipment is working. The effect of the steel wire rope will be severely stretched, and sometimes it may break, which will cause major safety accidents and cause serious personal and property losses. Therefore, it is very necessary to monitor the wire rope tension of mine hoisting equipment. [0003] The tension monitoring of steel wire rope is a complex w...

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Problems solved by technology

[0003] The tension monitoring of steel wire rope is a complicated task, and it is often difficult to make correct judgments, and it is difficult to detect the existing safety hazards in time

At present, there are three main methods for monitoring the tension of the steel wire rope: one is to use capacitance or inductance to monitor the tension of the steel wire rope, and use the change value of capacitance or inductance and the change value of the diameter of the steel wire rope to calculate the tension of the steel wire rope. The disadvantage of this measurement method is that both the capacitor and the inductance are charged, the anti-electromagnetic interference ability is weak, and it is easily affected by the complex environment, which affects the accuracy of the measurement; one is to connect a measuring instrument in series between the steel wire rope and the lifting weight. Force sensor measurement, this method must be measured in a static state of the wire rope, and when this measurement method is in operation, the load cell must always be installed on the lifting device, and the sensor is loaded for a long time, so that the measuring element in the sensor produces Creep will cause large drift during measurement, and the linearity and sensitivity will decrease; one is to use the vibration wave method to measure, using the impact force to strike the steel wire rope vertically to generate lateral vibration, and then calculate the vibration frequency of the steel wire rope by testing the vibration frequency of the steel wire rope. Tension value, the disadvantage is that the mathematical model based on it is based on the basis of not considering the gravity of the wire rope. This measurement method has low precision and large error, which cannot meet the needs of actual engineering;

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