As environment. · This would eliminate any need

As a team of two, we have
designed an automated surface cleaning machine for clean room purposes. The machine
consists of a cleaning mechanism that clears dust and disinfects a surface and therefore,
restores the surface to normal preparing it for manufacturing and testing processes.
It is fully automated from outside the cleanroom run by a PLC.

The 3rd year project is set out in two
phases. Semester 5 is the design stage of the project. Semester 6 then consists
of manufacturing, programming, and testing the project.

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This report will discuss the design process of our
project, the 2-axis clean room surface cleanser. The machine will be fully
automated, so as it can be controlled from outside the clean room. It will
clean/ disinfect and clear a work surface so that it is ready for manufacturing
and testing processes.

 

 

1.1 Design Brief

·        
To design, fabricate and test a safe
machine to clear and disinfect a work surface in a remote cleanroom
environment.

·        
This would eliminate any need for a technician
to enter a potentially hazardous environment.

·        
This machine will work similarly to an
automated window cleaning system seen on high rise buildings, or similarly
solar panel cleaning systems.

 

 

 

1.2 Specification

·        
Size –

o  
Will weigh no more than
15kg

o  
Will be approximately
60mm x 40mm x 20mm

·        
Capability –

o  
Cleans both vertically
and horizontally

o  
Lifting capacity

o  
Agility

·        
Performance –

o  
Loads

o  
Speed

o  
Function

·        
Safety –

o  
Designed for safe
operation

o  
Operating Instructions
mentioned clearly

o  
 Will have minimal maintenance and these areas
will be easily accessible

·        
Scope –

o  
Prototype

·        
Operation requirements

o  
PLC control

·        
Testing –

o  
Life Span

o  
Fatigue

o  
Purpose

·        
Cost

o  
Bill of Materials

o  
Labour

o  
Design Time

 

1.3 Stretch Goals

These are goals that would like to be achieved should the
time and opportunity be available to do so;

·        
Design
the rails so as they can be extended and could fit a variety of table widths.

·        
If
machine is going to be used in a biochemical clean room for example, the
recommended disinfectant solution can replace the water used for the prototype.

A Clean Room is
an environment supplied with ULPA (ultra-low particulate air) filtered air, or
HEPA (high efficiency particulate absorption). The rooms are designed to meet
the cleanliness class requirements of manufacturing and testing processes. An
example of such would be pharmaceutical manufacturing companies.

Clean rooms require continuous cleaning, and surfaces/
surfaces of equipment used in the rooms must be as smooth as possible for
effective cleaning. 1 (What is a Clean Room? , 2017)

          Our
project aims to prevent further contamination of a clean room in aseptic
conditions (human intervention) as it will be fully automated and controlled
from outside the room. This solution increases the compliance to standard
procedures of these rooms.

 

2.2 Solar Panel Cleaning Systems

These systems work to clean solar panels so as the
dust blocks the solar cells, therefore work more efficiently. (NAWAZ, 2017)

 

2.3. Linear Actuator Systems

The idea of using the lead screw to drive the brush,
was found from research on, and watching videos of how linear actuator systems
work and how to achieve smooth motion with this type of system.

From the evaluation matrix above, Concept 3 had the
highest weighted score and is therefore our chosen design concept.

 

On the left, the
main criteria are shown which the concepts are weighted on. Performance and
Safety carry the heaviest weighting as they are believed to be the most
important aspects of this project.

Each Concept is
then given a raw score out of 10 for each criterion. This score is then
multiplied by the weight of each criteria, which gives the final score.

These final
scores are then compared, and the highest scoring concept determines the chosen
concept.

Functional Desirability and Feasibility

·        
The
project offers functionality that covers the needs of a clean room. It is
essential that surfaces in a clean room remain smooth and clean for effective
manufacturing/testing, etc. The project will clear and disinfect a work surface
when needed.

·        
Since
the project is fully automated, no employee should need to enter the clean room
at any time in order to complete this task. Therefore, it prevents any further
possible contamination within the rooms and will save time making the processes
more efficient.

·        
Some
measures have been taken to ensure the machine is maintainable, such as ……

 

Financial Feasibility

·        
The
chosen concept was refined to make it as cost affective as possible.

·        
The
annual cost of operation will only account for the electricity used and the
cost of the disinfectant used.

·        
The
financial benefits of the project would be that a company has no need to hire
an employee to ensure the surfaces in the clean room have been disinfected and
cleared.

·        
Should
the cost go up during implementation, the project would not stop production.
Additional back up resources would be easily found.

Operational Feasibility

·        
Full
automation means that an operator only needs to provide the necessary input and
the system carries on the whole function.

·        
The
environmental conditions are appropriate as dirt and dust will be cleared from
the tables. There will be no vibrations or noise from the machine. The
disinfectant is non-toxic or harmful to the environment or operator.

·        
There
is little to no training needed for the employees to use this machine.
Therefore, this will ensure that no units would need to be temporarily
shut-down, nor operate at fractional capacity.

Schedule Feasibility

·        
The
design phase of this project ensures that the project will be ready for
manufacturing in January.

·        
Planning
is finalized this semester so that the project can be completed next semester
in the desired timeframe of 12 weeks.

·        
‘Buffer’
weeks, for example are implemented into the planned schedule in case any
problems should arise. Therefore, the time is reasonable and will meet the
mandatory deadline.

·        
The
facilities are available in the workshop for the manufacture of this project.