...
Additionaly, the 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.
Fig 1.0 Isometric View
Fig 1.1 Top View
Fig 1.2 Side View
Components
Lever Arm
The lever arm is a 1" x 1" aluminum bar classified by the 80/20 Inc. as 1010. The length of the lever arm was decided to be 0.80 meters to account for the variation in the water level of the entrance tank from the overall head loss in the plant. 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. The lever is positioned in a way so that the slide can slide to zero and have 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.
Brake
The brake keeps the slide in place, also a component from 80/20 Inc. The brake naturally keeps the slide in place, while pushing on the area shown on the diagram relieves the pressure and allows for the movement of the slide
Float and Counter-Weight Connectors
The connectors are eyebolts that are screwed into the ends of the lever arm. The float and counter-weight are attached to these eyebolts by fishing line.
Stock Tank
The stock tank will sit on the triangular table that is pictured.
Constant Head Tank
The constant head tank is maintained on this makeshift platform that will place the tank at the same level as the lever arm.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.
As shown in our current design, most of these constraints can be met. We are using a slide mechanism that has a manual "brake" which allows the slide to be clamped in any position. (Describe how this "brake" mechanism works. Label figure below)
We have not found a way to get both slides on the same side of the lever arm as their "open channel dosing tubes" would interfere with each other. Currently, the slides are on opposite sides which could be awkward for the operator to manipulate. One solution would be to mount the lever-arm across the diagonal of the tank. The operator would then have easier access to both sides of the lever-arm. We are considering this option.
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?)
The AutoCad Drawing can be viewed Here
...