Vehicle assisted cleaning device and system

A system for cleaning a street surface or similar surface from extraneous material, the system comprising:

• a host vehicle:
• and
• a vehicle assisted working device for cleaning the street surface or similar surface from the extraneous material, the working device comprising:
• a body having a front portion and a rear portion in relation to a forward movement direction of the working device, the rear portion being configured to be attached to the host vehicle;
• at least one brush attached to the front portion of the body and configured to detach said extraneous material from said surface, the at least one brush being configured to rotate in a direction such that the portion of the brush contacting the surface moves in the forward movement direction of the working device;
• a blower disposed within the body and configured to provide an underpressure for suction of the detached extraneous material into the air flow from said surface and an overpressure;
• a suction system comprising:
• an entrance chamber disposed in front of the at least one brush and configured to receive the detached extraneous material, and
• a suction channel receiving the detached extraneous material into the air flow from the entrance chamber with the underpressure provided by the blower and directing said detached extraneous material over the at least one brush;
• a separation system disposed at the rear portion of the body and configured to receive the detached extraneous material in the air from the suction channel, the separation system comprising a cyclone elutriator having a tangential inlet configured to receive the air flow from the suction channel, the cyclone elutriator being disposed beneath the blower such that the air flow is provided substantially vertically from the cyclone elutriator to the blower that creates the overpressure and the underpressure for operation of the cyclone elutriator, the separation system being configured to separate said detached extraneous material from said air flow from the suction channel to obtain the separated air;
• a return system configured to return the separated air to the surface with the overpressure created by the blower, the return system comprising a nozzle to provide an air-knife, the air flow velocity through the air-knife directing a shear stress force to the surface,
• wherein, the working device is configured such that when the working device is moved over a spot of the surface to the be cleaned, the spot is treated in the following order:
• the extraneous material is suctioned into the suction channel through the entrance chamber, the at least one brush brushes the spot, and the return system directs the shear stress force to the surface with the separated air.