| 摘要 |
<p>An accumulator head (34) for a blow molding machine (10) uses an electromechanical drive assembly (60) for the purging and programming functions. The purging actuator (66) of the drive assembly (60) includes a ball screw (75) and nut assembly (76) in which the ball screw (75) is rotated by an electric motor (78) to move the ball nut assembly (60) vertically and operate the plunger (86, 88) of the accumulator (34). Another ball screw (67) and nut assembly (68) is included in the programming actuator (64) of the drive assembly (60) for moving the mandrel (52) vertically, thereby controlling the size of the die outlet opening (48) of the accumulator (34). Preferably, the ball screws (67, 75) of the programming and purging actuators (64, 66) are axially aligned with the nut assemblies (68, 76), each carried by a yoke (69, 77) that travels on guide rods (58). Four support rods (56) are provided to maintain alignment and provide stationary mounting for the respective motors (71, 78). The structure has sufficient rigidity to supply the force required for the purging operation, but uses no hydraulic actuators.</p> |
