CALCULATIONS FOR STRUCTURAL DESIGN OF HYDRAULIC SCISSOR LIFT WITH LOAD CAPACITY 3.5 TONS AT TMC INDUSTRIAL PUBLIC CO., LTD. THAILAND

Abstract

Scissor lift is device that is used to lift something to a higher place. In the design of frame structure, good accuracy is required in order to avoid the constraints that occur from the safety factor and strength. However, in determining the structure, it takes a layout that conforms to a predetermined specification. In addition, a hydraulic cylinder of 2 is used to balance the lift load. After the structure of the frame can be known value and strength, it needs to check by using the comparison of safety factor. If the comparison results do not match, then the design process must be repeated from the beginning. Therefore, assumptions on layout and structural assumptions are very influential on good results. Motor power, pump and oil tank volume need to be calculated to support force on cylinder in order to lift load. The results of the calculation and selection of hydraulic cylinders obtained are outside diameter 95 mm, Inside diameter 80 mm, Rod 60 mm. Meanwhile, for motor power used is 3HP, flow rate pump is 6.4 cc / rev, oil tank volume is 18.6 liters. Therefore, the calculation results for the design of this scissor lift is very suitable to lift the load 3.5 tons.