Design and Simulation of Mechanical Scissor Screw Type Bus propeller shaft Lifter Machine

Abstract

Scissor are lifting heavy objects to reduce the risk of injuries in around the world. In the Bishoftu Automotive Industry, assembling the drive shaft on the engine of the bus can be done by one person, but in, the production of bus drive shaft is assembled by three technicians (i.e., one person for controlling the overhead crane, a second person for holding the drive shaft and the third person for connecting the drive shaft with the engine and bearings). The aim of this research is to design the scissor-type bus drive shaft lifter for bus production factories when the drive shaft is assembled and disassembled. The design of the scissor was concentrated on finding the optimal lifting height based on the weight of the bus drive shaft and minimizing labor costs. Focusing on the deflection in accordance with the ANSI standard, the calculation regarding the allowable maximum deflection must not be exceeded. To analyses the data, manual calculations, solid modelling, and computer simulations were involved using state-of-the-art CATIA V5 software. The results show that the deflection is still in the acceptable range. However, some manufacturers find that the allowable maximum deflection is too excessive. Based on the initial input data, the remaining dimension of the scissor lift is calculated, and it can lift a maximum height of 750 mm. According to the results observed from the ANSYS simulation, the maximum stress distribution over the body of the scissor lifter is 22.88 MPa, and the maximum total deflection is recorded at 3.24 * mm. Therefore, the scissor lift can lift the weight of the drive shaft to carry and move horizontally by using four tires assembled on it and lifting the 80kg drive Shaft to the desired height. This screw-type scissor lift serves to give a mechanical advantage by changing rotational force to vertical force