The utility model discloses a prevent that axle changes from pressing from both sides tight linkage pincers, including the preceding clamping mechanism that is used for clamp shaft, be used for pressing from both sides the back clamping mechanism of tight spiral shell dress at epaxial mounting, be equipped with between preceding clamping mechanism, the back clamping mechanism and connect both and make both can make one -way relative pivoted coupling mechanism, coupling mechanism can follow the axial and extend, its the biggest axial length who extends apart from be greater than the mounting. The utility model discloses a set up preceding clamping mechanism, back clamping mechanism, coupling mechanism, it can not the pivoted purpose to have realized dismantling epaxial mounting time axis, prevents that the axle transduction from sending the oil leak or even the internal connection line drops, convenient to use. The dismantlement finishes, rotates the handle and rolls out the draw -in groove with the pin, and under return spring's effect, supplementary handle is automatic to kick -back, realizes the not hard up of folder, can with the utility model discloses from epaxial lifting off, easy operation is convenient.