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Obviously I learned it, why didn't I think of it?

In these two days, a turning mechanism was designed, driven by a cylinder, and the flipping angle was about 120°. Although the scheme is feasible, but the specific design found that the stroke of the cylinder is particularly long, the limit position force is not good, just when I was at a loss, I suddenly found that there is a ready-made angle amplification mechanism on the excavator, but I did not expect that the excavator is also very knowledgeable.

Excavators are everywhere, but we turn a blind eye to them. The connecting part of the bucket of the excavator is the angle amplification mechanism, and the angle amplification is realized through the four-bar linkage, as shown in the figure below:

The angle magnification mechanism is actually a crank stick mechanism, I obviously learned it, and I still remember it, but when faced with specific problems, why can't I think of the crank stick mechanism?

The principle of the angle amplification mechanism is very simple, the joystick rotates a small angle, and the crank can rotate a large angle, thus realizing the angle amplification function.

There are also stroke amplification mechanisms on linear motion, the most common are moving pulleys and scissors and forks, and the stroke is directly magnified by 2 times.

Relying on machinery to achieve the amplification of stroke and angle, which is simple and reliable, which not only reduces the space occupation, but also greatly reduces the cost of selection, in short, the function that can be achieved by machinery, as much as possible to use machinery.

Although the excavator has been invented for more than 100 years, many people say that it has no technical content, in fact, it is very wrong, the more mature the product, the more worthy of our reference and imitation.

Do you know? The excavator is driven by a hydraulic pump, which is different from a car!

A threesome will have my teacher, and knowledge is everywhere.