Abstract: The present disclosure provides a vacuum cleaner main unit which is firstly provided with a mounting seat, a battery, a motor, and a dust cup. The battery, the motor, and the dust cup are all mounted on the mounting seat; the mounting seat is provided with a handle and an air inlet pipe; the air inlet pipe is fixedly connected to the handle; the motor is detachably mounted on the mounting seat; the position of the motor corresponds to the position of the handle; the battery is detachably mounted on a first end part of the motor; the dust cup is detachably mounted on a second end part of the motor; and the position of the dust cup corresponds to the position of the air inlet pipe. Compared to the existing art, the present disclosure has the advantages that the suction loss of a vacuum cleaner is reduced, and the suction power is increased, so that the weight of the vacuum cleaner is distributed more uniformly, and it is more labor-saving when the vacuum cleaner is held in a hand to do cleaning.

Abstract: A multi-functional lifting device, comprising a lifting device body; a power source; an electromagnetic DC motor; a decelerator connected to the DC motor; a main moving wheel positioned on an output axle of the decelerator; a rope element twined into the main moving wheel; a resilient wheel brake unit on one side of the main moving wheel locking the rope element into position; an intermediate wheel having a rope groove complementary to the rope groove of the main moving wheel; and a speed control module and a PCB board connected to the DC motor. The multi-functional lifting device is capable of providing controllable upward and downward movement when the power to the DC motor is connected or disconnected to the power source.

Abstract: A multi-functional lifting device, comprising a lifting device body; a power source; an electromagnetic DC motor; a decelerator connected to the DC motor; a main moving wheel positioned on an output axle of the decelerator; a rope element twined into the main moving wheel; a resilient wheel brake unit on one side of the main moving wheel locking the rope element into position; an intermediate wheel having a rope groove complementary to the rope groove of the main moving wheel; and a speed control module and a PCB board connected to the DC motor. The multi-functional lifting device is capable of providing controllable upward and downward movement when the power to the DC motor is connected or disconnected to the power source.