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Central, IA | I have been told many times that a double linkplow is the most accurate plow to grade at speed, but have never been given a good explanation as to why.
I know the front link is what is usually used to control grade and the rear is either in float or has a pressure regulated circuit on it.
What I'm lacking on is the geometry. Is the front link a true parallel link (pivot pins spaced equally)? If so, that would mean that cylinder would only adjust elevation and have no effect on pitch of the plow? I have been told before that a true parallel beam plow doesn't work well as it takes to much effort/force to raise or lower it. It would also seem that uneven terrain would have an adverse affect on a parallel beam plow as well. That explains why many plows use pitch to control grade.
Is the rear link slightly off of a true parallel to allow it to control the pitch of the shank?
I have a project in the back of my head on building a plow, but not sure if a pitch plow is the way to go or if I should be looking more into double links. I wish I could find one close to home to put a tape measure on. |
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Tip of the Thumb of Michigan | Most likely the parallel arms are not equal length, thus changing the pitch on the boot. Watching our custom tiler, it took me years to figure it out. Why was the main up/down going up as the parallel went down. I didn't care enough to ask. The parallel arms were so close in length that they looked the same to me. |
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MN | Good question.......
For true dual link controls using parallel arms, look at the Crary Tile Pro (formerly Wayne's plow) a mounted plow. Looking at the plow mounted to a tractor you'll see two parallel arms and two sets of cylinders. The smaller cylinders on top are integrated into the upper A arm and control the "pitch". The lower, longer set of cylinders control elevation (up/down pressure) so you get the advantage of not only pitch control, but also up and down pressure to most accurately hold grade. So to answer your question, the upper pitch cylinders provide pitch control by effectively making the upper A arm link slightly longer or shorter, and not truly "parallel" 100 % of the time, similar to a commercial tile plow. |
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Explain the physics of a double link tile plow to me
