Drilling device

A drilling device, comprising:

• a base of a multi-layer structure, wherein the multi-layer structure comprises a cover plate, a first layer plate, a second layer plate and a bottom plate sequentially stacked on one another, wherein the first layer plate, the second layer plate and the bottom plate are locked together, and the cover plate and the first layer plate are locked with one another, and wherein at least one of the first layer plate, the second layer plate and the bottom plate are directly formed with a cooling channel of a serpentine shape;
• a driving assembly disposed on the base, wherein the driving assembly comprises a transmission shaft and a driving gear directly disposed on and coupled with the transmission shaft;
• and
• a drill set disposed on the base and coupled with the driving assembly, wherein the drill set comprises a plurality of drills disposed under the base and driven and rotated by the driving assembly,
• wherein the drill set further comprises a plurality of drill bodies provided with the drills, a plurality of coupling portions, and a plurality of transmission portions for coupling the plurality of drills,
• wherein each of the drill bodies is configured with an action gear,
• wherein each of the coupling portions comprises a rotating shaft, a first coupling gear and a second coupling gear respectively disposed at two opposite ends of the rotating shaft,
• wherein the second coupling gear is engaged with the action gear, and the driving gear is engaged with the first coupling gear to rotate the first coupling gear to cause the rotating shaft to rotate the second coupling gear synchronously so as to rotate the action gear to actuate the drills,
• wherein each of the transmission portions comprises an idler gear and a passive shaft with one end thereof being disposed on the idler gear and the other end thereof being configured with a passive bearing, and the idler gear rotates the drills,
• wherein the second coupling gears, the action gears and the idler gears are as one gear layer, and the driving gear and the first coupling gears are as another gear layer, and
• a driving force is provided to rotate the transmission shaft to rotate the driving gear, and the driving gear further rotates the first coupling gear synchronously so as to couple the rotating shafts to rotate, such that the rotating shafts rotate the second coupling gears to further rotate the action gears synchronously, and at the same time, the action gears are rotated by the idler gears engaged with the action gears to rotate the drills so as to perform a drilling operation on an object.