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In the numerical control lathe, the hydraulic power station can be used as a single module in the back of the machine tool. In the use of the end of the top of the large batch processing, can be equipped with a hydraulic end of the top system, so that the other can become an operating module, sharing the same hydraulic power system.
In the processing, when the program runs to the need for speed state, NC system first issued the stop signal, then program sends a control signal to the hydraulic pump starting fuel supply, also electromagnetic valve of hydraulic system of pull in according to the control signal, to the transmission cylinder oil, so that the piston rod extends out or returned, and push the shifting fork of the gear transmission, when shifting gears in place after the cam touches microswitch, feedback signal to the control system, the transmission is over, the program continues to run down implementation of the workpiece.
The spindle speed module is arranged on the main shaft box, which comprises a bracket, a cylinder, an oil pipe, a micro switch, and so on. The length and width of the stand is the same as the top of the main shaft, and the whole spindle speed module is arranged on the main shaft box. The middle part of the support is provided with a baffle plate, and the transmission oil cylinder is fixed on the baffle plate and is positioned above the gear shaft to control the sliding, and is coaxial with the guide shaft. The cylinder piston rod is positioned in the guide shaft, and the transmission fork is connected with the transmission shaft through a pin shaft. Transmission fork set on the guide shaft, can be driven by the piston rod to move back and forth along the guide shaft. The guide shaft is hollow and has a guide groove, so that the piston rod is connected with the transmission fork, the guide shaft is fixed on the bracket by the pin shaft. The two gear shift fork are vertical structure, respectively, in the corresponding sliding gear in the transmission groove.
Variable speed when the oil cylinder, the piston rod through the pin shaft to drive the sliding of the sliding gear, the gear is engaged in the transmission, gear in place by the fork on the convex block on the micro switch on the cover, the transmission of the gear in place, the end of the transmission.