| 摘要 |
PURPOSE:To make cleaning work load light while lowering cleaning cost by making a scavenger a self-propelled type and move along a duct depending on reciprocal excitation and transfer of pairs of electromagnets and peeling-off adhering dust with a rotatable raking system. CONSTITUTION:A raking system 4 for scavenging duct which is rotated by a motor 3 fixed in a main body 1 and a group of pairs of electromagnets to adsorb and keep a position on inside walls of a duct are installed. Each electromagnet is installed face to face toward the axial center, one group of the electromagnets is connected selectively with the motor 3 to make a movable electromagnet group, the other group is a fixed electromagnet group fixed on the outer circumference of a main body, and the movable electromagnet group is moved along the duct by the combination of attraction and fixation to the duct with transportation toward the axial center by reciprocal excitation of both groups. In this case, said raking system 4 is capped with sliding blades 17 on the top which are devided by screw blades rotated by a driving system, and the slide blades 17 are pushed outward so as to be fastened by pressure to the inner walls of the duct by springs 8. |
