Three-position oil cylinder apparatus

• Main Authors: BAI JIAFANG, MA ZILI, LI RUIHONG, ZHANG ZHENGYI, GUO ZHANGXIN, YUE ZHIHENG, HAN CHANGSHENG, QUAN RUIXIA
• Format: Patent
• Language: Chinese; English
• Published: 19.08.2009
• Subjects: BLASTING; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOTDIRECTED TO A PARTICULAR RESULT; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR; DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g.ARRANGEMENTS FOR COPYING OR CONTROLLING; ENGINEERING ELEMENTS AND UNITS; FLUID-PRESSURE ACTUATORS; FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS; GEARING; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; HYDRAULICS OR PNEUMATICS IN GENERAL; LIGHTING; MACHINE TOOLS; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OFPARTICULAR DETAILS OR COMPONENTS; MECHANICAL ENGINEERING; METAL-WORKING NOT OTHERWISE PROVIDED FOR; PERFORMING OPERATIONS; SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; THERMAL INSULATION IN GENERAL; TRANSPORTING; WEAPONS

The utility model relates to a three-position oil cylinder device for changing gears of a numerical control machine headstock, which comprises a cylinder body provided with pressure oil ports. Oil holes A, B, C are respectively arranged on the cylinder body; when oil enters from the hole B and returns from the hole A, a piston rod can reaches the left end successfully and the headstock is shift to the gear I; when the oil enters from the holes A and B, the piston rod is located at a middle cavity and the headstock is shifted to the gear II; when the oil enters from the hole A and returns from the hole B, the piston rod is located at the right end and the headstock is shift to the gear III.The three-position oil cylinder device can change the gears precisely, reliably and stably and is high in automatization degree and low in cost.