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The proto-type is made up of two main components: the structural frame work and the moving lever-arm. The frame components are constructed using a modular aluminum framing system manufactured by a company called 80/20 Inc. Affectionately called "The Industrial Erector Set," this company offers a wide variety of components along with an a down-loadable 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 of the framework extrusions will allow us to mount extra components that can be mounted with any standard "National Course" thread. All accessories are readily available components and are purchased through McMaster-Carr.
The dimensions of the structural framework is are based on the actual dimensions of the entrance tank 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 Head losses 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
Additionaly, the the The frame work also includes a table to hold a small stock tank and another table to hold the constant-flow device. As Ideally, 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. Figures 1.0 - 1.2 illustrate our prototype from various views and a full description of each component follows.
Fig 1.0 Isometric View
Fig 1.1 Top View
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Lever Arm
The lever arm is a 1" x 1" T-slotted aluminum-extrusion bar as classified by the 80/20 Inc. as 1010. The length of the lever arm was decided to be a critical dimension for Alum dosing and is calculated in the Dual Scale Child page. This length of 0.80 meters to account accounts for the variation in the water level of the entrance tank resulting from the overall head loss changes in the plant flow. The lever arm is attached on the top with components from McMaster Carr. The bar is attached to the lever arm with a clamp, while the sides of the bar are attached by bearings so that it can rotate. pivot rod with a clamp which is then attached to two side bearings on the frame. The accessories were purchased through McMaster Carr. The lever is positioned in such a way so that the slide can slide to zero and have be positioned directly under the pivot providing a manual shutoff.
Slide
The slide is a component from 80/20 Inc. (Part # 6730) that we attach the orifices to. There is also a hand brake that is attached.
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Float and Counter-Weight Connectors
The connectors are eyebolts that are screwed into the ends of the lever arm. The Also shown in Figure 1.0 are the eyebolts that will be used as attachment points for the float and counter-weight are attached to these eyebolts by (should we decide to use one). These items will be attached using mono- filament fishing line.
Stock Tank
The stock tank will sit on the triangular table that is pictured. The table for the stock tank was decided to be 24.13 cm (9.5 inches) tall to provide enough head to demonstrate how our system works.
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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 a 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.
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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.
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Bill of Materials.pdf 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 and parts were received on on November 30, 2009. We are currently waiting on receipt of the materials to continue on the project.
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By the end of the semester we intend to have a functional, full scale non-linear chemical doser. In order to accomplish this, this sub-group needs to complete the following:
- Assemble components delivered by 80/20 Inc.
- Attach hydraulic components