| 摘要 |
FIG. 3 illustrates a clamp piston assembly ( 40 ) comprising a body portion ( 44, 46, 48 ) in which a pocket is provided. The pocket is arranged to receive an insert in the form of a rotatable clamp bushing ( 48 ). Sets of blades or wear pads ( 52, 62 ) are positioned on both an internal surface ( 51 ) of the pocket and the external surface of the clamp bushing ( 48 ) and cooperate to form sealable chambers that extend about the circumference of the clamp bushing ( 48 ). These chambers are in fluid communication with suitable processor-controlled valves ( 82, 84 ) and hydraulic or pneumatic pumps ( 80 ) that operative to purge and inject fluid from and into the chambers. Pressurized fluid acting within selected chambers causes rotation of the clamp bushing ( 54 ). The insert also contains a row of teeth ( 58 ) arranged to selectively engage corresponding teeth ( 25, 26 ) in a tie-bar ( 19, 20 ). The clamp bushing ( 48 ) is hence independently rotatable from its surrounding body ( 48 ) that, in use, is mechanically attached to an injection molding machine ( 10 ).
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