In this paper, singular form and movement precision hydraulic presses novel parallel structure were analyzed, discussed the three kinds of singular form of the condition occurs and institutional attitude, and with the dimensionless parameter determines the hydraulic cylinder design space precision motion control accuracy influence and draw the corresponding map.

Figure in the upper part of the fuselage is fixed, the lower end of the slider movement of the actuator. To transmit motion between the body and the slider by more than two branches connecting link. As can be seen, the whole press a symmetrical structure, more than two-link branched identical. Each multi-branched stem is up and down two sets of parallelogram structure.

Wherein the parallelogram structure is composed of a fixed body, no longer on the connecting rod and intermediate member of two parallel oil screw vacuum pumps and other components; under parallelogram structure is composed of an intermediate member, two parallel equal length and slide lower link blocks. The inside of the two symmetrical intermediate member is connected to a horizontal arrangement of the hydraulic cylinder by a hinge, the driving force of the entire organization from this. Due to limitations of the fixed rail, horizontal cylinder telescopic movement, passing through a series bilaterally symmetrical multi-pole structure, clover Roots vacuum final drive slider reciprocating single degree of freedom in the vertical direction. Compared with the traditional hydraulic presses, this parallel structure of its brought many new advantages.

First of all, there are four parallel press symmetrical fulcrum, compared to the traditional single-cylinder hydraulic machine has better anti-side load capability; secondly, by a single hydraulic cylinder as a drive, avoid the traditional multi-cylinder multi-cylinder hydraulic machine may appear in control The phenomenon is not synchronized. Based on these characteristics, the structure is suitable for large presses applications.