A three-dimensional nanobattery formed by individually wiring nanostructured electrodes and combining them with an electrolyte. The spring pin assembly includes a housing having a side wall and a top wall having a circular opening therethrough and a domed inner surface extending upwardly from the side wall. Furthermore, a plurality of first insulating layers covering the gate wire and the storage wire are formed on the gate insulating layers. The lift cylinder controlling part is configured to open a proportional control valve at the open ratio for elevating the blade when a distance between the designed surface and an edge of a blade is determined to be less than or equal to a threshold.