Математична модель процесу розвантаження ґрунта з ковша скрепера з напівкруглим днищем

Abstract

UK: Розглядається теоретичний аналіз процесу розвантаження ковша скрепера з напівкруглим днищем із примусовим розвантаженням. Теоретичний аналіз дозволяє розраховувати залежність зміни маси ґрунту від положення задньої стінки відносно довжини днища скрепера, а також зусилля, необхідні для його розвантаження.

EN: Statement of the problem. Modern engineering aimed at creating energy efficient machines to perform various operations. The main areas of development are: reduction of energy consumption for extraction of soil; increase productivity; increase durability and reliability; expanding technological capabilities and so on. Traditional methods of calculating the forces acting at unloading scraper, make it impossible to fully describe the process, but only allows to calculate the maximum effort that is required when loading [1; 2]. Therefore, efforts that occur during discharge are unknown. Analysis publications. Analyzing the design features improve scraper should be a trend aimed at increasing the efficiency of filling the bucket. It is not the problem of unloading soil with a scraper, which also requires additional energy. Increasing the efficiency of the discharge can be achieved by improving the shape elements bucket design. The purpose of the article. Create a new theoretical method of calculation which takes into account the amount of residual soil in buckets throughout the period of discharge. Problems. Develop a mathematical model of unloading scraper. To conduct a theoretical analysis of the discharge scraper for the purpose of determining the current analytical support. Develop an algorithm for calculating the definition of resistance discharge. Conclusions: 1. Scraper considered for the mathematical model of the process of discharge, taking into account : friction force of the soil in the bottoms of the bucket; force of friction of soil on the side walls of the bucket; rolling resistance force of the rollers suspension rear wall; inertia translational motion of the mass of the soil and the back wall when turning the unloading mechanism of soil scraper; the length of the bottom; the height of the bucket; dialed density of the soil; angle of crumbling soil and allow us to calculate the mass dependence of the soil on the position relative to the length of the back wall of the bottom scraper and the efforts that are required for its discharge; 2. Theoretical calculation allows to determine : the resistance to discharge scraper with a semicircular head; change in the mass of soil in buckets on the position relative to the length of the back wall of the bottom scraper for soil density 1 500 — 2 000 kg/m3. 3. Algorithm for reporting scraper allows you to calculate the resistance of the discharge. N-US style='font-size:11.0pt;mso-ansi-language: EN-US'>4. Comparison of technical and economic performance of both variants. Conclusion. With PC MONOMAH it’s very convenient to compare variants of overlap. This program may correct the estimated model without creating a new file.