protection device 6 i e a wire protection device wherein the electric motor 1 and the speed reducer 2 are an integrated structure the drill bit 3 is directly connected to the speed reducer 2 the electric motor wire follower protection device is rotatably connected to a tail of the electric motor 1 fig2 and 3 show the connection relations of the interiors and the housings of the electric motor 1 the speed reducer 2 and the drill bit 3 a housing 102 of the electric motor 1 and a housing 203 of the speed reducer 2 are separable and both are fixed by screws 8 preferably both are sealedly and fixedly connected the drill bit 3 is directly connected to an output shaft 202 of the speed reducer 2 and a rotor shaft 101 of the electric motor is as a fixed shaft of an input gear 201 of the speed reducer 2 this structure simplifies the connection between the drill bit 3 and the speed reducer 2 the connection is simplified from the previous connection by a flexible shaft to a direct connection and improves the power transmission efficiency from the original 35 to 80 fig3 shows a housing structure of the speed reducer 2 and a rotating shaft 4 and a second slide shaft 5 are symmetrically provided on both sides of the housing of the speed reducer 2 wherein the rotating shaft 4 is located at a center position of a side of the housing of the speed reducer 2 and the second sliding shaft 5 is eccentrically provided relative to the rotating shaft 4 fig3 also shows a chute 204 provided on a.