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Abstract: The
principle to control the differential cylinder with one servo pump or a
speed variable pump, accumulator and proportional throttle valve
together is put forward to improve the efficiency applied to control the
plastic injection modeling machine. By using this principle, the pump
only works during cylinder protrudes. The kinetic energy that system
holds during this process will be absorbed by accumulator and be reused
as the power for cylinder withdrawal. When cylinder draws back, the
movement is controlled by proportional throttle valve. The flow through
the proportional throttle valve is corrected according to the new flow
control principle to eliminate the influence of the pressure in
accumulator and the load. Compared with the system that the velocity in
both directions is controlled by speed variable pump, the energy
consumption caused by braking of electric motor during cylinder
withdrawal can be eliminated completely. The research results prove that
the new circuit principle can meet the requirement of plastic injection
molding machine to its dynamic and static performance.
Kew words: Adoptive
control Pump controlled system Plastic injection molding machine
Clamping unit
CLC No: TH137
国家自然科学基金(50275102)和浙江大学流体传动及控制国家重点实验室开放基金(GZKF-2002004)资助项目. Received 20050521,
received in revised form 20051128
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