Gear box welding device of mine screening machine

The utility model discloses a gear box welding device of a mine screening machine, and belongs to the technical field of screening machines, the gear box welding device comprises two bearing guide rails and four bearing parts arranged at intervals, each bearing guide rail is connected with one bearing part, and the bearing parts connected with the bearing guide rails can move along the bearing guide rails to get close to or get away from other bearing parts. Gearboxes of different sizes are borne through the combined action of the four bearing pieces. The bearing piece comprises a mounting base and an adjusting part connected with the mounting base, and the adjusting part can make contact with the gearbox and can move up and down relative to the mounting base so as to adjust the included angle between the gearbox and the horizontal plane. By the adoption of the structure, the welding angle of the gearbox can be conveniently adjusted, so that welding operation is facilitated, and the welding quality is guarant