Inner bow rod rotating device

The invention discloses an inner bow rod rotating device which is characterized in that a lower bow rod and a rubbing bow rod are mounted on a rotating cylinder, the lower bow rod comprises an outer bow sleeve and an inner bow rod, the inner bow rod is sleeved with the outer bow sleeve, teeth extending axially are arranged on the outer circumference of the inner bow rod, and notches facilitating exposure of the teeth are formed in the outer bow sleeve; the twisting bow rod comprises a rod body, the rod body is provided with a spur rack extending in the axial direction, the spur rack is meshed with the corresponding teeth, and a rotatable fifth bearing is installed at the bottom of the outer end of the twisting bow rod; an arc-shaped groove is formed in the rubbing support, the fifth bearing can enter the arc-shaped groove and roll along the groove wall of the arc-shaped groove, and an inwards-concave arc groove which is concave towards the circle center is formed in the arc-shaped groove. The device has the b