MENG 2005 – ENGINEERING DESIGN 1
LECTURER – DR. BRIDGE
GROUP PROJECT – DESIGN OF A MINI – EXCAVATOR
DATE SUBMITTED – 19TH NOVEMBER, 2010
GROUP NAME – THE A-TEAM
GROUP MEMBERS GERARD MOHAMMED JUSTIN KALLOO SHIV RAJ BALROOP ADRIAN PIRTHYSINGH 809000675 809002400 808000136 809000847
TABLE OF CONTENTS
Introduction Literature Review Definition of Problem Functional Analysis Final Design Project planning Failure Modes, Effects and Analysis Calculations Discussion and Interpretation of Findings Individual Attachments References List of Figures and Tables Table 1 Table 2 Table 3 Table 4 Table 5 Table 6 Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Morphological Table Part 1 Morphological Table Part 2 Evaluation of Alternatives Part Listing Process Planning table Summary of Calculations Functional Decomposition Diagram Sketch of Force analysis for digging Sketch of boom calculations Sketch for stick calculations Sketch for Tipping calculations
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On any construction site, the excavator is one of the most important pieces of equipment. Excavators are designed to move considerable amounts of soil and earth. They consist of a backhoe and cab mounted on a pivot (a rotating platform) atop an undercarriage with tracks or wheels. Excavators are used in several tasks on construction areas, such as: brush cutting (with hydraulic attachments), digging of trenches, holes, foundations, demolition, general grading (landscaping), heavy lifting, mining and river dredging. Excavators come in a wide range of sizes, spanning from large excavators weighing in at around 30 tonnes to mini excavators weighing around 5 tonnes. This project deals with the design of a mini excavator to be used on a small construction site. To increase the versatility of the machine, the excavator is designed with the capability of attaching different work tools. Our particular design contains four attachments, along with the standard bucket. These accessories include: 1. 2. 3. 4. A trench/ditch cleaning bucket A hydraulic hammer An auger A compactor
This report contains the steps taken in completing the design of a mini excavator. It includes final drawings as well as engineering calculations based on several design specifications to determine suitable dimensions for the finished design. In arriving at the final design, a few alternatives were considered and evaluated. The report also deals with the different alternatives and the methods of evaluation for choosing the final design. The bulk of this report details the methods undertaken to solving the design problem, which entails an array of design calculations, all aiding in arriving at the final design. Appropriate justifications for choices made are stated throughout the report. Certain assumptions were also made during calculations and these were positioned next to the relevant calculations.
In our research for the Mini-excavator there were many useful sources that helped in our design and understanding of the Mini-Excavator as they directly pertained to our project. These sources gave a brief history of the excavator as well as how it operates and functions. There were also sources pertaining to Hydraulic systems and the different types of steels used to construct the excavator itself. The first source used was an excerpt from the book, “Tall Buildings: From Engineering to Sustainability.” This was used to attain a basic knowledge of the workings and the history of the hydraulic excavator. This was utilised in tandem with other sources to provide a coherent amount of background knowledge on the hydraulic excavator. The design of the excavator goes way back to the year 1839 by inventor William Smith Otis, starting with the Otis Steam Shovel. This machine was powered by steam and for many years after, most inventions that were created used the...