Shaft and keyboard

A shaft, comprising:

• a shaft casing having a shaft cavity running therethrough, wherein a downward surface of the shaft casing is provided with a groove, the groove is located on one side of the shaft cavity, a partition board is provided between the groove and the shaft cavity, and the partition board is provided with a channel in a direction of the shaft cavity;
• a shaft core configured for slidably penetrating through the shaft cavity, wherein a side surface of the shaft core is provided with a sliding protrusion corresponding to the channel, and the sliding protrusion has a first inclined surface and a second inclined surface which are arranged back to back;
• and
• a first elastic part mounted in the groove, wherein a fixed end of the first elastic part is detachably connected with the shaft casing, and an abutting end of the first elastic part abuts against the first inclined surface at the channel,
• wherein when the shaft core slides downwards, the abutting end slides along the first inclined surface and strikes the side surface of the shaft core or a side wall surface of the groove, and when the shaft core slides upwards, the abutting end slides along the second inclined surface to the first inclined surface.