Positive pressure development trend and future market - machine system Union star packaging machinery

Early is give priority to with full hydraulic pressure machine, for energy saving and environmental protection contribute significantly weaker, all-electric positive pressure machine is the most representative on energy saving and environmental protection contribution equipment technology, the main difference of the two is the use of servo motor, the hybrid positive pressure machine with the advantages of both hydraulic and servo. In addition, in the long time maintain high pressure hydraulic press, higher power when there is still cannot completely replace the whole motor's advantage, therefore fully hydraulic system of energy conservation and environmental protection is also the most potential equipment technology. Traditional quantitative differences of positive pressure pump and servo system machine from the standard action can be divided into clamping, glue/pressure, material, cooling, mould opening, several stages, such as the stages we need to provide different and appropriate pressure and flow, for the oil pump motor, is press forming process is belong to the change of load state. In quantitative pump hydraulic system, the motor at a constant speed continues to provide a constant flow, although the proportions of the through type pressure flow valve ( EFBG） The stages can be up to the required pressure and flow rate allocation results, but outside of the control needed to hydraulic oil will be back to the fuel tank. For positive pressure machine, the output power of power consumption is sustained, that is to say, if the positive pressure machine in standby state, continue to provide a constant flow rate and quantitative pump directly back to the fuel tank, form a fairly large and unnecessary power cost. Servo system control technology can improve the defect with the above quantitative pump hydraulic system. Servo motor through a transmission signal feedback to the drive for precision rotary encoder control, controlled the flow of hydraulic oil demand by the oil pump output directly, that is the size of the output flow rate is the precise speed control to obtain the increase or decrease. Hydraulic oil pressure control are in series on the oil pump pressure sensor, the pressure signal feedback to the drive end for continuous transfer results of closed loop control, to achieve the purpose of precise control of pressure, so that can provide accurate servo control system is needed in each stage of injection molding pressure and flow, more quantitative pump system, can greatly reduce the power consumption of the output. Injection molding in different stages of the energy saving principle from the injection molding power consumption status, feeding and cooling two stage belongs to the long time action, its power is the most worth saving, especially cooling, servo system is completely don't need to do work for positive pressure machine, in other words, the longer the cooling time, products molding cycle energy-saving benefit is more significant. Positive pressure machine servo energy-saving system, constitute the general hydraulic endeavors of positive pressure machine servo energy-saving system of standard form for the three major components: servo motor, drive and oil pump group. Servo is divided into AC induction servo motor and permanent magnet servo ( Synchronous servo) ; Based on features of motor drive control technology is divided into frequency conversion control and servo control; Oil pump types have common gear pump, plunger pump, vane pump, gear pump, including external gear and internal gear and spiral. In addition to the above standard three major components, servo control system is still need the following accessory parts: 1, the control card ( ControlCard) Some said PG card for communication interface of communication and transformation, the encoder signal feedback to the rotational speed of the card for vector control. 2, the encoder transmission line ( Encoder） Terminals is passed on the encoder signal to the drive end, 9 pind - commonly used the drive end Sub as a communication interface to communicate. 3, braking resistor ( BreakResistance) Also called brake resistance or rebound resistance, avoid motor turn nasty stopping for motor reverse current generated by the direct recharge to drive, drive burnt, braking resistor will consume the charge transfer into hot go back. Has now developed to conduct electricity storage charge back flow and reusable technology, is energy saving and progress. 4, pressure sensors, PressureSensor) Servo system is pressure closed loop control of injection molding important feedback component, often set up in hydraulic pump outlet and commonly used specifications for the output pressure 0 10 v, corresponding to the maximum pressure of 250 bar. 5, the electromagnetic interference filter ( EMIFilter) Connection between the RST and the drive to avoid interference or drive also may cause electromagnetic interference to the RST ontology, lead to other machines are affected by the interference and operation. 6, ac reactance reduces the main power harmonic, peak current, protect the driving mechanism of electronic components, also to prevent tripping by mains voltage spike, suggest installation for power quality is poorer. 7, reactance: used to reduce the radiated interference, reduce the instability of signal transmission caused by the interference.