In the CNC lathe, the hydraulic power station part can be placed behind the machine tool as a module. When the tailstock is required for mass processing, a hydraulic tailstock system can be added to make it another operable module, sharing the same hydraulic power system.
In processing, when the program runs to the state where the speed change is required, the numerical control system first sends a stop signal, and then the program sends a control signal to start the hydraulic pump to supply oil, and at the same time, the solenoid valve of the hydraulic system pulls in according to the control signal to supply the variable speed cylinder The oil causes the piston rod to extend or retract and push the shift fork to shift the gear. When the gear is in place, the cam touches the micro switch, and the feedback signal is sent to the CNC system. The shift ends, and the program continues to run downwards to execute the workpiece.
The spindle speed change module is installed on the spindle box, which is composed of a bracket, an oil cylinder, an oil pipe, and a micro switch. The length and width of the bracket are the same as the top of the headstock. The entire spindle speed change module is installed on the four screw holes used to install the cover on the headstock, and positioning pin holes are added for module positioning. The middle of the bracket is supported by a partition plate. The transmission oil cylinder is fixed on the partition plate and is located directly above the gear shaft to be controlled to slide, coaxial with the guide shaft; the piston rod of the oil cylinder is located in the guide shaft and is connected with the shift fork through a pin shaft; The gear shift fork is sleeved on the guide shaft and can move back and forth along the guide shaft under the drive of the piston rod; the guide shaft is hollow and has a guide groove to connect the piston rod with the gear shift fork, and the guide shaft is fixed on the bracket by a pin. ; The two gear shift forks are of a downward vertical structure, which are respectively stuck in the shift grooves of the corresponding sliding gears.
When the oil cylinder is supplied with oil during gear shifting, the piston rod drives the sliding fork to move the sliding gear through the pin shaft, so that the gears engage in variable speed. After the gear is in place, the bump on the fork touches the micro switch on the cover to send the gear in place. Signal, it is the end of shifting.
