IDENTIFY SUITABLE HYDRAULIC FACTORS FOR CONTROL RAISE AND LOWER LASER SCRAPERS

Abstract

The present work was carried out in private farm at Hoash Essa – Behera governorate during agriculture season of 2008 in clay soil. The aim of this experiment is to study the relation between the tractor hydraulics, hydro-electric valves, scraper cylinder, raise and lower scraper paled, scraper load and their effects on the laser land leveling efficiency. An area of (6 feddans) was divided into 2 plots; each plot was leveled with different scraper. Two scrapers were used 3 and 3.6 m width (10 and 12 feet). Each plot was surveyed and calculated the volume of cut (m3). The hydraulic of oil pressure (bar) and hydraulic of oil flow rate (l/min) were measured with the scraper raise (every 0.5 cm) and computed the volume of soil fill (m3). Also, the actual capacity of scrapers volume m3, amount of earth moving m3/h and laser efficiency were calculated. The results showed that, actual scrapers loaded were 69 and 70.50 % (from theoretical loaded) with 3 and 3.6m scraper width, respectively. Maximum pressure needed to raise scraper was 52 and 110 bar with 3 and 3.6m scraper width, respectively. Maximum oil flow rate was 18.5 and 38.00 l/min. with 3 and 3.6m scraper width respectively. Scrapers field capacities were 10.88 and 16.96 m3/h with 3 and 3.6m scraper width, respectively. Every cubic meter of soil needed to 52 bars and 18.5 l/min. oil flow rate to fill area 25 m2 with 4 cm depth. The scraper capacity efficiency increased by increasing cutting depth, it was increased from 6.94 to 69.44% by increasing cutting depth from 0.5 to 4 cm for 3 meter scrapers width also it was increased from 4.63 to 70.73% by increasing cutting depth from 0.5 to 4 cm for 3.6 meter scrapers width. The predicted equations help engineering computer designers to make decision easily and determine the actual hydraulic oil pressure and oil flow rate to move the amount of earth.