Does anyone know any known applications with a stopping ramp that is acctuated with a cylinder and is self locking in its top position. That means that the force on the ramp doesn't load the cylinder, but is done with proper mechanism. An example: Big pipes (15.000 kg) are rolling down a small slope (cca. 0,5°) and I need to stop and buffer them in the middle of the slope. I want to use a simple ramp that opens up in front of them, but I would like to have the ramp almost self locking in top position so that the cylinder doesn't need to transfer the majority of force, when the pipe hits the ramp.
You might be able to do it like this:
(quick sketch, members not to scale)
When the cylinder is fully extended, the 2 beams will be aligned and the cylinder bears almost no weight.
When the cylinder retracts the rear support formed by the two beams folds, thus lowering the ramp.
Here is an idea if you want the ramp to lock in a fixed position after raising by hydraulic jacks (attached to the ramp framing). As shown, once the ramp frame has cleared the latch, the latch will be in the desired position to support the ramp frame until manually re-positioned.
Note the portal frame is located near the end of the ramp frame.
I misread the question at first. Below are the edits. If I understand it well, you just want to stop some rolling pipes. Would the following be enough?
The solution seems to be to have just something else take the weight. Push up the plate and have something else take the weight than the pusher. It's the blue line on the picture. This can be done automatically or manually.