An electric vacuum suction lifter, operable to be sucked on a surface, the electric vacuum suction lifter comprising:
- a main body, having a suction surface in one side of the main body, wherein the suction surface is configured with a first annular sealing unit and a second annular sealing unit thereon, one side of the first annular sealing unit which is distal from the suction surface is defined as a first adhering surface, the second annular sealing unit is disposed in a first opening of the first annular sealing unit, one side of the second annular sealing unit which is distal from the suction surface is defined as a second adhering surface, a distance between the second adhering surface and the suction surface is greater than a distance between the first adhering surface and the suction surface, and the second annular sealing unit, the suction surface and the surface together form a sealed space when the second adhering surface of the second annular sealing unit is adhered to the surface;
- a control unit disposed on the main body;
- a vacuum pump disposed on the main body, wherein:
- the vacuum pump is electrically connected to the control unit, and the vacuum pump is controlled by the control unit to draw the air inside the sealed space to the exterior of the main body;
- a pressure sensing unit disposed on the main body, wherein the pressure sensing unit measures a pressure of the sealed space to generate instant pressure information;
- a battery unit disposed on the main body, wherein the battery unit is electrically connected to the control unit, and the battery unit provides electric power for operation of the control unit, the vacuum pump and the pressure sensing unit, and wherein an external power equipment charges the battery unit;
- a start button disposed on the main body, wherein:
- the start button is electrically connected to the control unit, and the control unit controls operation of the vacuum pump when the start button is pressed;
- and
- a pressure relief button disposed on the main body, wherein the air drawn to the exterior of the main body enters into the sealed space through the main body when the pressure relief button is pressed,
- wherein when the second adhering surface is adhered to the surface and the control unit controls the operation of the vacuum pump to draw the air inside the sealed space to the exterior of the main body, the control unit determines whether the pressure of the sealed space is greater than a high predetermined pressure based on the instant pressure information, when the control unit determines that the pressure of the sealed space is greater than or equal to the high predetermined pressure, the control unit controls the vacuum pump to terminate the operation of the vacuum pump,
- wherein when the control unit controls the vacuum pump to terminate the operation of the vacuum pump, the pressure sensing unit continuously measures the pressure of the sealed space, and the control unit continuously determines whether the pressure of the sealed space is smaller than a low predetermined pressure based on the instant pressure information, when the control unit determines that the pressure of the sealed space is smaller than the low predetermined pressure, the control unit controls the operation of the vacuum pump, wherein a negative pressure value corresponding to the high predetermined pressure is greater than a negative pressure value corresponding to the low predetermined pressure.