1.4 AC servo motor driving quantitative pump system

High response quantitative pump system of AC servo motor drive is an advanced high performance and energy saving system developed in recent years. It solves the . It solves the problem of frequency conversion adjustment technology by adjusting the hydraulic pump speed and the speed of response variable properties of slow, at the same time the operation characteristics of itself and improve the utilization ratio of electricity. In the 200r/min speed, can output high proportion (can reach 2.8 times of the rated torque), which can keep the torque fluctuation is very low, but at very low speeds can also have the constant torque region large, in order to achieve a constant flow output. Speed is the demand with the system flow and change, the reaction speed of 4/1000 seconds faster than the servo valve. Hydraulic system basically does not need cooling water, the product packing and cooling time is long, energy saving up to 80%. By setting the motor speed to control the flow of the form without throttle loss, can greatly reduce the pressure maintaining and idling conditions (waiting period) the flow loss. Holding pressure, the motor is in the stopped state, to be more energy efficient than the load sensing pump energy-saving driving system. AC servo motor driven high response of quantitative pump and servo valve to form a closed loop control system, can play such characteristics, precision control performance and the system is improved. Ningbo Hai. Ningbo Haitian take TFW as the transmission power of servo control system design platform of TFW/5 servo energy-saving vertical injection molding machine series equipped with high performance, in the process of injection molding, the output can be adjusted according to the corresponding frequency pressure and different flow, realized the automatic matching and adjustment of the pressure flow accurate closed-loop control and servo the motor to the energy demand of vertical injection molding machine, finally can save 40% a 80% capacity.

The maximum speed of up to 4000r/min, AC servo motor, AC servo motor driven so high response of popularization and application of quantitative pump system in vertical injection molding machine, R & D has to be of high speed low noise hydraulic pump, so as to reduce the manufacturing cost system. If the AC servo motor is simple to energy-saving angle to promote the application of high response driving quantitative pump system, it will be because the cost is too high and can not reach the expected effect. If the quantitative pump system is applied to the ordinary vertical injection molding machine driven by AC servo motors with high response, also can only reflect a little bit of energy saving effect and can not become truly practical commercial machine. Only combine the forming process of high speed sensitive response characteristics of the servo motor and precision injection, developed a new type of energy for specific processing of high-end plastic products of high performance injection molding machine, can make the high response of AC servo motor driving quantitative pump system is widely used.

2 electro-hydraulic hybrid drive system

Hydraulic electric hybrid drive combine the advantages of full electric injection molding machine, and retained the properties of mechanical and hydraulic injection molding machine. Opening and closing and locking the system usually adopts hydraulic transmission to the mold, and the plasticizing and injection action by the servo motor to complete. Thus in the provision of large clamping force at the same time, the manufacturing cost to obtain high accuracy at low injection machine hydraulic system; because only undertake the mold closing and locking action task, so the load power of the pump source is greatly reduced. Energy consumption about 70% forming vertical injection molding machine used in plasticizing, and hydraulic electric hybrid drive the plasticized by the servo motor with high efficiency to complete, so as to improve the utilization ratio of energy.

Because the electric and hydraulic drive energy saving system with excellent performance, the application in the vertical injection molding machine speed fast. Heskey (Husky) assisted energy-saving system company launched Hylectirc series mixed injection molding machine with variable pump and water cooled motor equipped with a standard part of the energy storage device, can be in at the same time mold plastic material, so as to shorten the work cycle. Egnel company is actively developing can be fully electric injection molding machine hydraulic achieve accuracy and low cost of the locking mechanism with Victory Electric series injection molding machine together precision is high and the energy saving. Synergy mixed type of injection machine developed by Netstal company, is especially suitable for plastic parts for the processing of thin wall and high technology content, this machine adopts the injection screw is directly driven by electric power, its accuracy can be compared with the all electric injection molding machine, while maintaining the high control accuracy, thus saving energy. Reciprocating motion process of Demag of Egrotech company ELEXIS series mixed type injection molding machine injection and screw are accomplished by the hydraulic system, the opening and closing process measurement plasticizing and die by a DC servo motor control. Italy BMB company designed a new ElePack series liquid injection molding machine electric hybrid drive, the injection stage by dynamic hydraulic oil with accumulator system to control injection rate and injection quality, and product ejection plasticizing steps and materials is driven by a motor to finish to save energy and reduce molding cycle. PowerShotTM injection system for special Moog Inc developed from mixing type vertical injection molding machine of full closed loop drive has become the standard configuration of a number of manufacturers to produce hybrid vertical injection molding machine. Moog Inc also uses PowerShotTM injection system technology and the Japanese UBE Machinery Group jointly developed a hybrid type injection molding machine of the utility model, the machine performance than traditional hydraulic vertical injection molding machine more rapid, more compact, more power, such as the injection rate of 80Omm/s, torque is 3000Nm, can be used for processing of a new type of plastic is different with the traditional plastic. After the test found that the new type of vertical injection molding machine, not only reduces the energy consumption, noise level, the amount of oil and maintenance conditions, but also in reducing the volume of the equipment at the same time, can also meet the extreme operating conditions. Chen Hsong machinery Limited by Share Ltd, Hotai industrial Limited by Share Ltd, Limited by Share Ltd, Ren Xing Asian plastic machine Co. Ltd. and other enterprises have launched a gas electric hybrid system. According to Ren Xing machine limited company introduces, gas electric hybrid system configuration in the Smart Kid SK series of vertical injection molding machine, energy saving of up to 30% to 60%. Guangdong disorderly Li Machinery Co., the company independently developed the first domestic Y series "super energy-saving" electro-hydraulic hybrid vertical injection molding machine has passed the performance test. Test report shows that, compared with similar products, the machine has the advantages of higher precision, die fitness has numerous advantages, including energy saving has more advantages; compared with the conventional products, can be energy-saving 70%. After testing, the machine per hour power consumption is only.278 degrees, and the power consumption of conventional machine per hour is about.904 degree. To work every day for 8 hours, Guangdong disorderly profit "super energy-saving vertical injection molding machine 'old saving 51.1 degrees. Energy saving capacity of the machine not only in the domestic leading position, peers in the world are at the advanced level.

Application of 3 energy-saving hydraulic components

Energy saving element is used more and more in vertical injection molding machine is an obvious sign of the development of energy saving technology. At present, PTFE ring wear, low friction ring lattice, stepseal, cartridge valve, low pressure loss, helical baffle type cooler and other energy-saving hydraulic components and accessories have been widely used in vertical injection molding machine.

In order to reduce the installed power and energy saving, high speed thin wall injection molding device use the accumulator. Accumulator energy can achieve the quick release, is the key to realize high speed injection. General accumulator injection circuit, the on-off valve with no injection replaced proportion valve and MooG valve to control, so there is oil circuit for impact is too large, can not put control and hose vibration severe defects such as energy storage. Therefore, application of accumulator rapid injection device is not ideal, there are still the injection speed regulation is not obvious or difficult to control and cannot use phenomenon.

4 Conclusion

According to the requirements of injection molding to develop energy-saving hydraulic dynamic model which can be matched with the precision of vertical injection molding machine drive system to realize the high-end injection molding performance, is the direction of our efforts to develop innovative energy saving hydraulic power drive system.