Dust-proof and anti-theft tubular lock assembly

A tubular lock assembly comprising:

• a tubular lock having
• an inserting surface;
• a keyhole formed on the inserting surface and being annular;
• and
• a cover screw hole formed on the inserting surface and enclosed by the keyhole;
• a cover detachably assembled with the tubular lock, and having
• a covering board segment covering the keyhole and having an inner surface and an outer surface;
• the inner surface facing to the tubular lock;
• a screw rod segment formed on the inner surface of the covering board segment, and detachably screwed in the cover screw hole of the tubular lock;
• and
• a first fitting segment formed on the outer surface of the covering board segment;
• a disassembling unit that is a round rod and has:
• a first end with a second fitting segment formed thereon, the second fitting segment corresponding in shape and size with the first fitting segment of the cover, such that the second fitting segment is adapted to engage with the first fitting segment, and the disassembling unit is capable of rotating the cover relative to the tubular lock via the second fitting segment and the first fitting segment, and
• a second end opposite to the first end, and having a limiting groove formed through an end surface of the second end;
• and
• a key having
• an unlocking segment being a round tube and detachably mounted around the second end of the disassembling unit, an end surface of the unlocking segment corresponding in shape and size with the keyhole of the tubular lock, such that the key is capable of unlocking the tubular lock, and
• a limiting segment located in an inner side of the unlocking segment, and detachably mounted in the limiting groove, the limiting groove abutting the limiting segment in a peripheral direction of the disassembling unit, such that the key and the disassembling unit are fixed in the peripheral direction of the disassembling unit.