Automatic tightening and assembling part for valve body and valve bonnet

The utility model relates to the field of valve production and assembly, in particular to an automatic tightening and assembling part for a valve body and a valve bonnet, which comprises an outer box body, a rotator arranged at the bottom of the outer box body, a valve body support and a valve bonnet support arranged at the top of the rotator, and a jacking part arranged in the middle of the rotator, a jacking air cylinder in the jacking component stretches out to jack a valve body in the valve body support and a valve bonnet in the valve bonnet support, the lifting driver is installed at the top of the outer box body in a suspended mode, the speed reduction motor is fixed to the driving end of the lifting driver, and the tightening device is fixed to the top of the lifting driver. The lifting driver is used for driving the gear motor and the tightening device to generate a height change action in the vertical direction relative to the rotator, the upper end of the tightening device is rigidly connected to an