+

Hard to say without a picture, but разгон (acceleration) can be due to gravity. For example, here is a picture of a photoseparator with a chute following the feeder:

Figure 1 displays an image of the complete sorting
machine prototype while figure 2 displays detail of the
camera, chute, eject nozzle, and LED illumination

Figure 1. Photo of sorting system showing the cameras, illumination, eject nozzle, chute, and feeder.
https://www.ars.usda.gov/ARSUserFiles/30200525/441 High spee...

Input product is loaded in the sorter via in-feed hopper. With the help of vibration the material flows along the chute to the distribution channels. Then the product gets into the inspection zone, where it is checked by the high-tech sensors or CCD-cameras. Sensors (or cameras), having received the reflected light from the selected material, generate electric signal for computer operating system.
http://csort.org/wp-content/uploads/2017/04/csort-ru.cms-pho...
http://csort.org/technology/photoseparator/
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Animation:
http://www.adricemill.com/images/sorting.gif

I think this is a jargonized equivalent of "блок разделения".
Alternative: distillation unit ((unlikely in a phoroseparator but not impossible)).

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Note added at 7 hrs (2017-08-19 19:48:05 GMT)
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Alternative 2: separation module; separator module.