Dust-proof and vibration-proof cover and method of manufacturing connecting element therefor

A dust-proof and vibration-proof cover, the dust-proof and vibration-proof cover being installed on a vacuum pump, a rotating shaft being protrudingly disposed above the vacuum pump, a rotor being sleeved on the rotating shaft, a locking chamber being recessed at a center of the rotor, a center of the locking chamber being connected to the rotating shaft, the dust-proof and vibration-proof cover comprising:

• a covering element, the covering element having a top surface;
• and
• a connecting element, a first end of the connecting element being connected to a bottom surface of the covering element, and a second end of the connecting element being configured to detachably connect to the rotating shaft,
• wherein at least one portion of the connecting element presents a continuous gradient change in at least one physical property between the first end and the second end of the connecting element, wherein the physical property is selected from a group consisting of hardness, rigidity, volume, density, thermal expansion and magnetism,
• wherein the physical property of the portion of the connecting element adjacent to the first end matches the physical property of the covering element, and the physical property of the portion of the connecting element adjacent to the second end matches the physical property of the rotating shaft.