Fixture looseness control: When the radial drilling machine needs the rocker arm to rotate around the inner column, the SBl button should be pressed first, the contactor KH4 coil is energized, and the motor M4 starts to run. The gear oil pump is driven by the gear clutch to rotate, and high-pressure oil is sent out through a certain oil system and transmission mechanism to loosen the outer column, and then the SBl button is released. The contactor KM coil is powered off and released, and the motor M4 stops running, pushing the rocker arm and the outer column to rotate around the inner column.

Clamping control of the fixture: when the rocker arm of the radial drilling machine rotates to the required position, press the SB2 button again, the coil of the contactor IM5 is energized, its main contact is closed, the motor M4 starts to rotate reversely, and the external column is clamped under the push of the hydraulic system; Then release the SB2 button, and the KM5 coil of contactor will be released after power failure, and the motor M4 will stop running after power failure. The whole process of loosening, rotating and clamping the column ends.