Dynamic Properties of Chain Drive in a Scraper Conveyor under Various Working Conditions

Abstract

A scraper conveyor is important in coal mining. During operation, its working performance is affected by chain speed fluctuations, terrain fluctuations, and load changes. Thus, evaluating the influence of these factors on the dynamic properties of a scraper conveyor is important. This study first built a dynamic property test bench. Then, the vibration signals of the reducer output shaft were measured under various chain speed, terrain, and load conditions. Finally, the dynamic properties of a scraper conveyor were evaluated by conducting a frequency domain analysis of the measured vibration signals. The results show that the output shaft of the motor, the second shaft, and the second-stage meshing gear of the reducer are sensitive to external factors. Under the terrain conditions of “horizontal + vertical” bending, the middle chute was the most sensitive to the meshing frequency of the sprocket chain. This type of condition had a significant influence on the scraping phenomenon of the scraper and the middle chute. Under various load conditions, the amplitude of each shaft of the reducer decreased, especially the amplitude of the motor output shaft, but the scraping amplitude of the scraper and middle chute greatly increased. This study is of great significance for improving the dynamic properties and structural optimization of scraper conveyors.

Scraper conveyor chain pitch measurement based on speckle structured light

“…First, two speckle structured light 3D cameras are installed on the scraper conveyor to collect the point cloud of the scraper from 45° and 135° respectively; Second, segment the two groups of incomplete chain point clouds from the background point clouds of the scraper and coal; Third, using the pre calibrated rotation translation matrix, the left and right chains are registered with point clouds to obtain complete chain point clouds; Forth, the chain pitch is measured using the point cloud measurement algorithm, and the measurement results are output to the scraper control system; Finally, the control system controls the scraper conveyor to give an abnormal alarm according to the chain deformation. If the left camera coordinate system is used as the coordinate system of the measurement point cloud, the point cloud collected by the right camera is converted to the left camera coordinate system using formula (1)…”

“…The scraper conveyor adopts the chain transmission principle, takes the scraper chain as a working mechanism, rotates the chain wheel through its electric motor, and drives the scraper chain to circulate in the conveyor to accomplish the coal transportation at coal mining face [1].…”

Simulation Study on Dynamic Characteristics of the Chain Drive System for Mining Scraper Conveyor Driven by the Permanent Magnet Synchronous Motor

“…Based on this premise, a technique for calculating the distribution of tension in the chain transmission system is suggested, and the pattern of tension distribution is determined, offering a guideline for monitoring the changes in the tension of the ring chain. Jiang et al [12] constructed a test bench to assess the dynamic performance of a scraper conveyor. They gathered vibration data from the reducer at various chain speeds, weights, and topographical conditions.…”

Longitudinal torsional vibrations of the chain drive system of mine scraper conveyor

“…MATLAB software was used to simulate the dynamic problems of the scraper conveyor under direct starting and chain failure conditions. Jiang et al 20 studied the dynamic characteristics of a scraper conveyor by measuring the vibration signals of the output shaft of the scraper conveyor reducer for different chain speeds, terrains and load conditions. Dongsheng et al 21 used numerical simulations to study the meshing transmission of the sprocket and chain of a scraper conveyor.…”