Left Scissor Lift Essay

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¶ … Innovative Lifting Device for Use in the Challenging Environmental Conditions of Gondwana

Diploma of Engineering and Technology:

Engineering Design & Innovation

The focus of this project was to satisfy the unique and challenging design requirements that were needed to provide an important life-saving lifting device for use on another plant. The restrictions on power sources and dimensions required a thoughtful approach to design considerations, which are presented in this report together with a description of the design specifications and objectives that guided the project, the process used for concept selection and the resulting choice of alternatives, how the device was manufactured, followed by an overview of the final project using expository text, schematics and photographs. A discussion concerning what processes and materials were used to build the device and how they were sourced and purchased is followed by a description of the testing regimen that was used to refine the design of the device. Finally, a description of the risk assessment used to analyze the efficiency of the design is followed by a summary of the project's outcomes and the experiences of the group members.

Disclaimer

We declare the following to be our own work, unless otherwise referenced, as defined by the University's policy on plagiarism.

Summary of contributions:

Summary of contributions:

Summary of contributions:

Summary of contributions:

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Table of Contents

1.0 Introduction

2.0 Design Specifications & Objectives

3.0 Initial Concepts and Discussion

4.0 Concept Selection

5.0 Final Design

6.0 Manufacture

7.0 Testing and Risk Assessment

8.0 Conclusion

An Innovative Lifting Device for Use in the Challenging Environmental Conditions of Gondwana

1.0

Introduction

This group project involved designing a lift device that satisfied several design criteria, including dimensional limitations, minimum lifting ability, speed of operation and duration of life. In view of the power source limitations (electrical and chemical energy sources were not allowed), identifying the source of the power required and how to use this power to satisfy the design requirements was a major focus of the project. The approach used to achieve the design goals is presented below, including what design considerations were taken into account, as well as the design specifications and objectives that were used to guide the project. The group's approach used to select the most appropriate concept is followed by a description of how the group manufactured the device. A description of the completed device, including CAD drawings and photographs, is followed by listing of the materials were used to build the device and how they were sourced and purchased. Finally, a description of the testing methods that were used and the risk assessment steps taken is followed by a summary of the project's outcomes and the individual experiences of each group member.

2.0

Design Specifications & Objectives

The project specifications for the device are shown in Table 1 below.

Table 1

Project specifications for lifting device

Specification

Wish

Demand

At start device must be contained within 400 x 400 mm cube

X

Canister must remain on platform for duration of lift including a rest period of at least 20 seconds at the elevated position.

X

After release, devices must not be in contact with anything apart from the canister and the operating surface.

X

Elevation must not take longer than two minutes

X

Elevation must not take longer than one minute

X

Total weight limit of device: 4 kg (8.8 lb)

X

The device must win

X

The objective for the device was to successfully complete a lift of winning height for the required duration using an innovative approach to design and manufacture as discussed further below.

3.0

Initial Concepts and Discussion

Some of the first ideas developed by the team using a brainstorming technique involved the use of compressed gas to power a piston-driven mechanism that would lift the decontamination can. Other ideas involved the use of levers and springs, and how these power sources could be used alone or in combination with each other to achieve the design goals for the device. The compressed-gas concept received some additional attention at first from the team members since this was considered to be a potentially viable alternative that might be able to deliver the amount of energy needed to lift the can and keep it aloft for the 20-second duration required by the design specifications. The best concept in this category was a vertical piston-driven apparatus, similar in appearance and operation to an ordinary bicycle pump, powered by compressed nitrogen; this concept was designed Concept A.

The second choice for the device was the result of discussions by the team members about using a lever-driven mechanism to achieve the desired lift. Several lever-driven concepts were discussed with the best one being designated Concept B. Finally, a scissor mechanism as illustrated in Figures 1 through 3 below which would be powered by a spring was discussed by the team members. Following a series of refinements, this design was designated Concept C. And the three alternatives compared for advantages and disadvantages as well as strengths and weaknesses as described below.

4.0

Concept Selection

The comparison of the three alternatives resulted in the Concept A device being eliminated because of weight concerns for total apparatus, including the compressed nitrogen gas canister as well as the need for a heavy regulating valve that would keep the pressure within acceptable limits. The second choice, Concept B, was eliminated because of the limitations on the amount of height achievable with a single lift action and the estimated aggregated weight of all of the components needed to construct the device so it would operate reliably. This process of elimination resulted in Concept C. being selected as the optimum approach to satisfying the design requirements for the lift device. This process is illustrated in Table 2 below.

Table 2

Three concepts' respective advantages and disadvantages

Concept

Advantages

Disadvantages

Concept A: Compressed nitrogen gas powered lift device

1. Reliable source of energy.

2. Satisfies most design specifications.

3. Possibly use off-the-shelf bicycle pump to simplify manufacture.

Complete device too heavy

Concept B: Lever-driven mechanism for lift device

1. Reliable source of energy.

2. Satisfies most design specifications

Inadequate lifting ability in one action

Concept C

1. Reliable source of energy.

2. Satisfies all design specifications.

3. Device stable when at rest and in operation.

1. Complicated manufacture process.

2. Numerous moving parts introduce additional opportunities for device failure during operation.

5.0

Final Design

The final design that was developed using the Concept C. option is shown in Figure 1 and 2 below, and the design of the device is illustrated in the CAD renderings contained in Figures 3 through 5 below.

Figure 1. Oblique view of the Concept C. completed lifting device following manufacture

Figure 2. Side view of the Concept C. completed lifting device following manufacture

Figure 3. SolidWorks drawing of Concept C. device with dimensions of canister platform

Figure 4. SolidWorks side and top views of Concept C. device with dimensions

Figure 5. SolidWorks side view of Concept C. device showing sliding mechanisms and pivot point

6.0

Manufacture

A number of materials and tools were required for the manufacture of the selected device design which are set forth in the Bill of Materials in Table 3 below (tools do not receive a part number designation).

Table 3

Bill of Materials required for device manufacture

Materials/Tools

Description/Dimensions

Part No. Designation

Price

Thin pieces of wood

Two each, 30 cm square x 3 mm

Parts no. W1 and W2

$2.20

Wooden spars

Four each, 500 cm long

Parts No. WS 1 through W4

$3.58

Nails/brads

Assorted selection

Part N

$4.00

Screws

Assorted selection

Part SC

$4.25

Spring

One each

Part S

$20.00

Wood adhesive

Tube

Part WA

$2.00

Hammer

One each

$5.69

Screwdriver

One each

$6.35

Wood saw

One each

$15.60

Total Cost of Device

$57.32

All… [END OF PREVIEW]

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