Protective device for core drilling

The protection device comprises a protection barrel, a separation net, a water collector and a sealing piece, the protection barrel is of an internal hollow structure with the bottom end sealed and the top end open, and the interior of the protection barrel is used for containing a coring barrel; the isolation net is arranged in the protection barrel, the isolation net is used for containing chippings, a through hole is formed in the isolation net, and the coring barrel can penetrate through the through hole; a water outlet is formed in the bottom end of the protective barrel, and the water collector communicates with the water outlet and is used for containing cooling liquid output by the protective barrel; the sealing piece is arranged at the bottom end of the protection barrel and used for achieving sealing connection between the coring barrel and the bottom end of the protection barrel. By means of the protection device, chippings and cooling liquid generated during core drilling of the core drilling equi