Semi-automatic cross axle lubricating nipple tightening machine

The invention discloses a semi-automatic cross axle lubricating nipple tightening machine. The semi-automatic cross axle lubricating nipple tightening machine comprises a rack, wherein an air cylinder, a tightening assembly and a fixing assembly are arranged on the rack; the air cylinder is connected to the tightening assembly and is located above the tightening assembly; the tightening assembly is located above the fixing assembly and is arranged on the rack by an upper base; and the fixing assembly is arranged on the rack by a lower base. The semi-automatic cross axle lubricating nipple tightening machine has the beneficial effects that an optical coder of the tightening machine is used for detecting the rotating speed of a motor; a torsion sensor is used for sensing the torsion suffered by a lubricating nipple; and when the lubricating nipple is in contact with a cross axle, the torsion sensor and the optical coder are matched with each other to work, so that the lubricating nipple and a cross axle are tig