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QUAN Long
Institute of Mechatronics Engineering,
Taiyuan University of Technology,
Taiyuan 030024, China
LIU Shiping
Department of Mechanical Engineering,
North China Institute of Water Conservation
and Hydroelectric Power,
Zhengzhou 450008, China |
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IMPROVE THE
KINETIC PERFOR-
MANCE OF THE
PUMP CONTROLLED
CLAMPING UNIT IN
PLASTIC INJEC-
TION MOLDING
MACHINE WITH
ADAPTIVE CONTROL
STRATEGY*
Abstract:
The kinetic characteristics of the clamping unit of plastic injection molding machine that is controlled by close loop with newly developed double speed variable pump unit are investigated. Considering the wide variation of the cylinder equivalent mass caused by the transmission ratio of clamping unit and the severe instantaneous impact force acted on the cylinder during the mold closing and opening process, an adaptive control principle of parameter and structure is proposed to improve its kinetic performance. The adaptive correlation between the acceleration feedback gain and the variable mass is derived. The pressure differential feedback is introduced to improve the dynamic performance in the case of small inertia and heavy impact load. The adaptation of sum pressure to load is used to reduce the energy loss of the system. The research results are verified by the simulation and experiment. The investigation method and the conclusions are also suitable for the differential cylinder system controlled by the traditional servo pump unit.
Key words:
Adaptive control Pump controlled system Clamping unit Plastic injection molding machine
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