Optical fiber sensing type continuous automatic weighing system and method free of speed sensors

Abstract

The invention provides an optical fiber sensing type continuous automatic weighing system free of speed sensors. The optical fiber sensing type continuous automatic weighing system free of the speed sensors comprises a first fiber bragg grating sensing weighing device, a second fiber bragg grating sensing weighing device, a fiber bragg grating demodulation instrument and a computer, wherein the first fiber bragg grating sensing weighing device and the second fiber bragg grating sensing weighing device respectively comprise a force transmission component used for transmitting the weight of materials on a material conveying belt, and a fiber bragg grating strain sensor used for converting the weight of the materials into an optical signal, the force transmission components are arranged at the front end and the rear end of the material conveying belt respectively, the output end of each fiber bragg grating strain sensor is connected with the fiber bragg grating demodulation instrument through a transmission optical path, and the two paths of optical signals are converted into digital signals through the fiber bragg grating demodulation instrument and are then transmitted to the computer. According to the optical fiber sensing type continuous automatic weighing system free of the speed sensors, all on-site detection elements are of the optical fiber type, electric sensing elements are eliminated completely, and thus the weighing system can be adapted to severe monitoring environments; due to the fact that a measurement unit is omitted, an error source is eliminated, and the fault rate of the weighing system is decreased.

Description

technical field [0001] The invention relates to optical fiber sensing technology and dynamic weighing instrument technology, in particular to a continuous automatic weighing technology. Background technique [0002] The function of the continuous automatic weighing system is used for the measurement in the process of conveying materials, and it is widely used in the fields of grain, coal, mining, metallurgy, building materials, and pharmaceuticals. The continuous automatic weighing system needs to have two basic functions, one is the detection of the continuous load of the material, and the other is the detection of the conveying speed. [0003] At present, the continuous load of materials in continuous automatic weighing systems at home and abroad is basically detected by electrical sensing elements. It performs poorly under harsh monitoring conditions. When it is used in a complex monitoring environment for a long time, it is prone to failures such as zero drift, which gr...

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Problems solved by technology

At present, the related patents of optical fiber sensing technology for continuous automatic weighing are: Differential strain type optical fiber Bragg grating suspension belt scale, the patent number is CN201020103073.0, this patent utilizes optical fiber grating sensing technology, adopts The beam structure realizes material weighing, but does not provide any description for speed detection

[0004] For the detection of conveying speed, the current method is to install a speed sensor on the material conveying equipment. However, the installation position of the speed sensor and the weighing device is not at the same place, which makes it difficult to maintain the speed detection result and the speed at the instantaneous weight. Synchronization, which ultimately affects the accuracy of the output results of the continuous automatic weighing system

In addition, the speed sensor installation method is usually to install a runner on the material conveyor belt, and indirectly obtain the conveying speed of the material belt by measuring the rotation speed of the runner. This open installation is easily affected by the working conditions of the conveyor belt, such as Material spilled between the conveyor belt and the runner, relative slippage between the conveyor belt and the runner, changes in the tension of the conveyor belt, etc., will cause inaccurate speed measurement results

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