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The proto-type is made up of two main componentcomponents: the structural frame work and the moving lever-arm. All components will be fabricated The frame components are constructed using a modular aluminum framing system manufactured by a company called 80/20. Affectionately called "The Industrial Erector Set," this company offers a wide variety of components along with an Auto-cad plug-in of each of their components. With these tools, we have been able to design and evaluate multiple proto-types. Additionally, their T-bar design will allow us to mount extra components that can be mounted with any standard "National Course" thread. All accessories are readily available components purchased through McMaster-Carr.
The dimensions of the structural framework is designed with based on the same actual dimensions as of the entrance tank except the actual tank measures 1 meter x 1 meter and our framework is 1 meter by ½ meter. The structural framework change was done only as a space saving measure. The height of our framework however is the same as the height of the entrance tank. Entrance tanks dimensions are based off the relationship between the design flow rate through the plant and the head losses within the plant and across the rapid mix tube. (Can you refer to a page where these are given and/or calculated?) Additionally, we need to accommodate the length of the rapid-mix tube and approximately 10 inches of free board. The actual values and results from these calculations are included elsewhere in this document but concluding, the height of the entrance tank and therefore our prototype is ***** meters high. (Can you show a page that diagrams these dimensions? Refer to the page where this value of 10 inches is calculated or given.)of the Agalteca plant. We have reduced the width to 1/2 meter as a space/material-cost saving measure but otherwise accurately reflect the entrance tank dimensions.
Entrance tank dimensions and elevation are a critical criteria in plant operations. All headloss throughout the plant must be accounted for in the entrance tank. Furthermore, the addition of the rapid-mix tube has added to the depth of the entrance tank. Full analysis of these parameters can be found on the Agalteca Page (***Karen, please show me how to link to this page.)
**Monica- make a drawing for Algateca headlosses in entrance tank
Additionaly, the the In addition, the frame work includes a table to hold a small stock tank and another table to hold the constant-flow device. As determined in the design of the constant head device, there should be ideally 30 cm between the orifice and the low water lever of the stock tank. This dimension has been taken into account in our design. **Find and link this page
We have designed three different lever systems with the current design presented here. (Please label the figure and what you are showing in each.)**Harry can you work on this section? Label components and describe each item in detail. Actually, I think we have an update version that shows the eye-bolts. Let me know when you are working on this and I will email it to you.
There are a number of constraints in the design of this lever arm. First, we need to facilitate a way to attach the floats and counter-weight. Secondly, we must have a way to adjust the distance the orifice travels down the arm. It was also requested that the operators be given a means to manually "shut off" the flow. This can be accomplished by moving the orifice directly in line with the pivot. We have also attempted to accommodate a second slide to facilitate attaching a second dosing pH control system. It is preferred that both slides operate on the same side of the lever to allow the operator easier access.
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Currently, each slide can be moved independently and can be moved to the center line to allow the operator to secure flow if needed. The floats and weights will be attached via the brackets at the endpoints. These will most likely become eye-bolts as they are easy to obtain and will attach on the center-line instead of the sides. (Can you refer to the figure that shows this?)
A material list is being created which lists each of these components, part number, quantity, catalog page number, price and associated fasteners. This material list needs to be updated to reflect our most recent design once this design has been approved by all members of the team. Also, in creating this list we found that some of our selected components were disproportionately expensive and modifications are being done to the frame to accommodate less expensive brackets. These are small modifications and the design is near ready to be sent out for pricing and the components will be ordered. Upon arrival of the parts, we will be able to build our full scale model, attach the hydraulic components and begin testing.
The AutoCad Drawing can be viewed Here
Useful 80/20 information
80/20 Inc. is a manufacturer of modular aluminum framing system. 80/20 components are used extensively throughout our lab and specifically in this project. This section provides some details to assist getting started with these components and using them in design.
http://www.8020.net/ 
; This is the main web page for this company. Available is a complete on-line catalog, price catalog and design ideas. Design is made easier using their "Auto-cad Plug-In." All components and frames are available with this Plug-In making requiring only limited Auto-cad knowledge for a professional looking design.
This Plug-In, called Auto-Quoter, is used by the distributors to generate their price-quote. Auto-Quoter can be downloaded on to any computer that is running Auto-cad and is free. This program leads to greater accuracy when ordering and less chance of error as the Bill of Materials is generated directly from the Auto-cad drawing.
Two local distributors are: Ralph W. Earl Inc.
5930 E.Molloy Rd.
Syracuse NY 13220
315-454-4431
rwearl@rwearl.com
Specifically- Bob Prosher:bproscher@rwearl.com. Competent and helpful salesman.
Hughes Industrial
9685 Main St.
Clarence NY 14031
800-759-8374
www.hughesind.com
Ordering Information
The Bill of Material as generated by the AutoQuoter program and is attached. Bob Proscher from Ralph W. Earl Inc was able to procure a 40% discount for us on materials. The order for these components was submitted to Christene Day on November 17,2009. We are currently waiting on receipt of the materials to continue on the project.
**Attach the BOM hereThe AutoCad Drawing can be viewed Here
Bibliography
- http://www.8020.net/Default.asp; Includes parts catalog, pricing list and Auto-cad Plug in
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