Movable scraper optimum control for cleaning balling pan bottom

Abstract

The invention relates to an optimal control of a movable scraper for cleaning the bottom of a pelletizing disk. The technical solution is: obtain the angular velocity ω of the disc pelletizer, establish the mathematical model of the trajectory curve of the movable scraper tool, the mathematical model of the trajectory curve density of the movable scraper and the mathematical model of the coverage index, and bring the obtained coverage index ξ into the simulation program Carry out optimization, determine the optimal parameter ωi of the movable scraper after calculation and optimization, and then input the optimal parameter ωi into the programmable controller PLC[5], the programmable controller PLC[5] is connected with the frequency converter[6], and the frequency conversion Device [6] is connected with frequency conversion motor [7], and frequency conversion motor [7] drives movable scraper [8] through transmission system. The invention makes the movement track of the movable scraper reach the optimal configuration, can greatly improve the coverage of the working area of ​​the movable scraper, can make the disk surface smooth, and the rolling track distribution of the raw balls in the disk is reasonable, and the output of a single machine is improved. And the powder content rate of green balls is reduced, and the ball forming rate of green balls has increased by more than 12%.

Description

technical field [0001] The invention belongs to the technical field of pelletizing discs. In particular, it relates to an optimal control of a movable scraper for cleaning the bottom of a pelletizing disk. Background technique [0002] The scrapers used in the disc pelletizer include: movable scraper, fixed scraper, crank slider type or reciprocating scraper. Among them, the fixed scraper type has been gradually eliminated because it is easy to form large pieces, has no "partition" and "volleyball" functions, and is difficult to replace and maintain; the crank slider type or reciprocating scraper is also called a swing scraper (Zhang Leshui reciprocating scraper) Improvement of [J], Cement, 2000.03 (52-53); Φ3.2m into a ball disc crank slider type scraper device [J], Cement, 2000.05 (39)), because the overall structure is more complicated, difficult to maintain and adjust , trajectory distribution is not very ideal, etc. are rarely used at home and abroad. At present, mos...

AI Technical Summary

Problems solved by technology

Although the structure is simpler than that of the oscillating scraper, and the track distribution is better than that of the oscillating scraper, because there are several cutter heads on the movable scraper disk, when the ball disk rotates once, the trajectories formed by the cutter heads of the movable scraper intersect with each other; at the same time, the cutter heads Part of the trajectory formed at the bottom of the pan cannot reach, causing a "ring platform" at the bottom of the pan, uneven distribution of material balls, incomplete cleaning of the bottom of the pan, and unreasonable partitioning of large and small raw balls due to the uneven chassis

As a result, there will be serious disk area and segregation, resulting in unbalanced operation of the ball disk and heavy load

The bottom of the disc pelletizing machine is uneven, there are many large balls that cannot be discharged in the disc, the trajectory of the raw balls in the disc is relatively chaotic, and material collapse often occurs; these directly lead to disc pelleting. The output of a single machine is low, the rate of raw balls is low, the powder content is high, workers clean up large balls frequently, and labor intensity is high

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