Frock clamp of revolving rack axle

The utility model relates to a frock clamp of revolving rack axle, the actuating arm that sets up slider in the backup pad, sets up cylinder on the base, sets up support piece on the slider, sets up with the cylinder linkage including base, backup pad, activity, the middle part activity setting of actuating arm serve on support piece, the piston rod of one end and cylinder of actuating arm be connected, the slider on be provided with first bearing and second bearing respectively, title setting is honoured to first bearing and secondary shaft, the other end of actuating arm on be provided withwith first bearing, second bearing matched with third bearing, first bearing, second bearing, third bearing be " article " type and distribute, and constitute between the first bearing, second bearing, third bearing and have the centre gripping space that is used for centre gripping revolving rack axle. The utility model has the advantages of simple structure, reliable, the simple operation of stable performance. 本实用新型涉及种