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Hydraulic screening bucket with eccentric bars.
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Previously:
Homemade sand screening machine - video
Quarry screening machine - GIF
I'm guessing, but those Z offset rotating shafts, with their spacing, probably have gears along each side, with a reversing idler between each one. Lot's of components, and something jambs, I can see that sychronizing gear set, or maybe a roller chain circulating off a hydraulic motor jambing. Might be a minor repair, but many fasteners and sealed surfaces. The side shot is too short and poorly lit, to see a fastener count and why the large bolt heads?.
There must be a over torque safety, or this thing would "shell" itself, and they don't show the operator getting out to clear that trapezoidal rock stuck good, and a sledge hammer is used to gingerly remove it without bending those long expensive to make Z shafts. Lot's of precision drilling between the three support members, and the high shock quality bearing count...
Probably an experimental design, and one off. I would be proud of the results. Until it cannibalizes itself.
If the bucket is robust and dependable enough to move 1000s of yards of material in a day for an entire mining season. Gold miners would love this for prequalifying pay reducing the need to for grizzly bars at the feed hopper.