principle
By precompressing the disc spring, sufficient upward broaching force is generated. When the tool needs to be changed, the CNC system sends out a signal to loosen the tool. By controlling the electromagnetic reversing valve of the hydraulic system, the hydraulic system introduces pressure oil into the upper cavity of the oil cylinder at the upper end of the spindle, and the piston of the oil cylinder pushes the broaching part to move downwards, continuing to compress the disc spring, and the tool handle moves downwards, and cooperates with the tool changing manipulator to complete the tool changing. There are two proximity switches at the upper end of the oil cylinder to detect whether the piston of the oil cylinder is in place; If the cylinder piston is not in place, then the two proximity switches will not send out signals, and the CNC system cannot continue to execute the next program to ensure the safety of the CNC machine tool.
Structure (see figure)