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1 Design of injection system for injection molding machine Steven.Face.JH.The development and application of Injection molding machine design，College of engineering, Yale University.July 2002 At present, an important direction of the development of injection molding machine is lightweight, saving resources, saving energy, high efficiency, low use cost. The reciprocating screw injection molding machine overcomes the problems of the traditional injection molding machine, such as the structure is complex, the quality of the material is even and the efficiency is low, which embodies the characteristics of the high and new technology content 1. Application of reciprocating screw injection molding machine, the clamping force is only 1/3 of traditional technology, still high quality assurance products, volume and weight of the machine is greatly reduced, can greatly improve the efficiency of injection molding, ensure the precision of products, as are of great significance in the control of energy saving and products. In recent years, Chinese injection molding machine industry under the guidance of reform and open, has achieved great development, is also the end of the injection molding machine equipment rely on imports of basic time already, which is mainly reflected in the number of injection molding machine manufacturers on the production and. Domestic injection molding machine production from several thousand to about one hundred thousand units. From the above data, the injection molding machine industry growth rate is far greater than the growth rate of GDP, the rapid growth and improve peoples living standards and the domestic home appliance industry is closely related to the strong driving force of the export processing industry but also the rapid development of plastic industry growth. From the amount of view, the domestic injection molding machine annual output value of tens of billions of dollars, exports billions of years. The worlds largest manufacturer of injection molding machine manufacturers in china. The United States for the production of large injection molding machine. 2. from the injection machine, the clamping force in the 1000-5000kN, the injection of 50-2000g in the majority of small and medium-sized injection machine. In the late 70s, due to the development of engineering plastics, 2 especially in the automotive, marine, aerospace, machinery and large household appliances widely used, so that the rapid development of large injection machine. The most obvious. In 1980 the United States has more than 140 10000kN clamping force TodayHot large injection molding machine into the towel field, by the year of 1985 to more than and 500 units. Japan famous machine company has successfully created the worlds largest injection molding machine, the clamping force of 120000kN, injection volume of 92000g. Since 80s, widely used in the CAD/CAE / CAPP / CAM application of computer technology in machine manufacturing industry, promoted the rapid development of 3 in China R both material transfer and screw plasticizing function, so to channel depth of screw structure and reasonable arrangement of different functional sections. Because the molten resin is easy to stagnate in the heating barrel and thermal decomposition, so to design a reasonable plasticizing device to ensure the molten plastic can be heated uniformly, at the same time, in order to achieve the injection pressure, must have reasonable structure design of the nozzle to reduce the pressure loss. The general asynchronous motor is used as the driving device, in order to achieve the required speed of the task, it is necessary to design a reasonable transmission device and arrange the position of the transmission parts reasonably. In order to accurately control the injection quantity, the metering device should be designed, and the automatic control of the measurement can be accomplished by the stroke switch. The plunger type injection device is composed of a quantitative feeding device, a 4 plasticizing component, an injection cylinder and an injection cylinder. Plunger injection device has the following characteristics: (1) the plasticizing is not uniform, and the capacity of the barrel is restricted. Due to external heating heating and melting plastic barrel heat from the plasticizing barrel, and the poor thermal conductivity of plastics,The reciprocating screw injection device also called screw line type (screw type) injection device is mainly composed of plastic part, a hopper, a screw, a transmission device, a mobile injection injection base, hydraulic cylinder, cylinder injection pressure etc. The plasticizing part and the screw transmission device are arranged on the injection seat, and the injection seat can move along the guide rail of the base by the movable cylinder of the injection seat to make the nozzle evacuate or close to the mould. At the same time, in order to facilitate the disassembly of the screw and the cleaning barrel, a rotating device is arranged in the middle of the base, so that the injection seat can rotate around a certain angle of the rotating shaft. The reciprocating screw injection device and a hydraulic motor direct drive type, according to the number of injection pressure cylinder is divided into single and double cylinder type two class structure. For the double cylinder hydraulic motor servo injection device, the screw and hydraulic motor are directly connected to the transmission. Double injection cylinder placed in parallel arranged on both sides of the injection cylinder, hydraulic motor with screw with axial movement, so that the follow-up type. The injection device has the advantages of compact structure, low energy consumption, it is a constant torque when the screw driving device, overload, hydraulic motor to drive, to have a protective effect on the screw, and the motor driving device is a constant power driving device, when the screw is easily broken screw 9 overload. At present, the hydraulic motor directly drives the injection device. plastic movement within the cylinder is in laminar state, close to the cylinder wall caused by high temperature, fast and plasticizing barrel center; plastic plasticizing temperature is low, slow. The larger the diameter of the cylinder, the greater the temperature difference, the more uneven plasticizing, and even the inner plastic has not been plasticized, and the surface of the 5 plastic has been overheated decomposition of the situation. It is more difficult for heat sensitive plastics processing. (2) large injection pressure loss. Because the injection pressure can not be directly applied to the molten material, need not through plasticized plastic transfer molten plastic through the slit and the inner wall of the spreader barrel into the nozzle, finally injected into the cavity, causing great pressure loss 8. According to the actual measurement, the pressure of the cavity is only 25% 50% of the injection pressure, so it is necessary to increase the injection pressure. (3) it is not easy to improve the stable process conditions. When the plunger is injected, the material of the feeding area of the feeding cylinder is firstly compressed in advance, and then the pressure is transferred to the molten material after being plasticized, and the molten material of the head is injected into the cavity. Visible, even if the plunger moves at a constant speed, but the filling speed of the melt is the first slow and fast, directly affect the flow of molten material in the mold. And the amount of each feeding is not accurate, the stability of the process conditions and product quality will also have an impact. In addition, the cleaning of the barrel is difficult, but its structure is simple, the injection volume is still relatively small, the value of its application. As a result, the general is only used in the injection volume of less than 60 7. The utility model is characterized in that the utility model is characterized in that the utility model is composed of two material cylinders, one is a screw pre plastic barrel, and the other is an injection cylinder, and the connecting points of the two cylinders are provided with a check valve. Preplasticization pellets through the screw barrel and plasticizing melt through the one-way valve into the injection cylinder 8. When the amount of molten material in the injection cylinder reaches a predetermined amount, the screw is plasticized to stop, the injection plunger advances and the melt is injected into the mold cavity. In the process of the rotation, the screw in the plastic cylinder not only transports the plastic, but also produces the shear friction heating and stirring mixing. 6 Therefore, the plasticizing quality and the plasticizing efficiency of the injection device are obviously improved compared with the plunger type injection device. In addition, due to the barrel off shunt shuttle, and enter the injection tube is already so melt, plasticizing, injection pressure loss is greatly reduced, the injection rate is relatively stable, so more application in continuous injection or large injection device. Screw preplasticization injection device solves the plunger type injection device defects in the work process, expand the injection volume, decrease the pressure loss at the injection site, but due to the increase in a barrel, the complex structure of large. Two barrels of one-way valve easily lead to plastic stagnation and decomposition. At the same time, in order to avoid the leakage of the melt, the requirements of the injection cylinder and the plunger are relatively high. Therefore, it is difficult to manufacture and use. In order to overcome these shortcomings, the structure has been further improved, and the reciprocating screw injection device is produced. The reciprocating screw injection device also called screw line type (screw type) injection device is mainly composed of plastic part, a hopper, a screw, a transmission device, a mobile injection injection base, hydraulic cylinder, cylinder injection pressure etc. The plasticizing part and the screw transmission device are arranged on the injection seat, and the injection seat can move along the guide rail of the base by the movable cylinder of the injection seat to make the nozzle evacuate or close to the mould. At the same time, in order to facilitate the disassembly of the screw and the cleaning barrel, a rotating device is arranged in the middle of the base, so that the injection seat can rotate around a certain angle of the rotating shaft. The reciprocating screw injection device and a hydraulic motor direct drive type, according to the number of injection pressure cylinder is divided into single and double cylinder type two class structure. For the double cylinder hydraulic motor servo injection device, the screw and hydraulic motor are directly connected to the transmission. Double injection cylinder placed in parallel arranged on both sides of the injection cylinder, hydraulic motor with screw with axial movement, so that the follow-up type. The 7 injection device has the advantages of compact structure, low energy consumption, it is a constant torque when the screw driving device, overload, hydraulic motor to drive, to have a protective effect on the screw, and the motor driving device is a constant power driving device, when the screw is easily broken screw,overload. At present, the hydraulic motor directly drives the injection device. Injection molding machine screw is divided into: gradual change screw, mutant screw, universal screw. The gradual change of the depth of the spiral groove is from the depth of the spiral groove of the feeding section to the spiral groove. Mainly used for processing a wide range of softening temperature, high viscosity non crystalline plastics, such as PVC, etc. The sudden change of the depth of the screw groove from the deep to shallow is completed in a short axial distance, which is mainly used to process the viscosity, the melting point of the obvious crystalline plastics, such as polyethylene, polypropylene, etc. The length of the universal screw compression section is between the mutant screw and the gradual change type screw rod, so as to meet the requirements of the melt and non crystal plastic melt. By comparison, found that graded structure between universal type and mutant, with the characteristics of both, by adjusting the process conditions to meet the processing of different plastics, expanded the scope of application, so the selection of screw structure. The structure, form and function of the screw are basically the same as that of the extrusion screw, but there are some differences. Injection screw 。From the injection machine, the clamping force in the 1000-5000kN, the injection of 50-2000g in the majority of small and medium-sized injection machine. In the late 70s, due to the development of engineering plastics, especially in the automotive, marine, aerospace, machinery and large household appliances widely used, so that the rapid development of large injection machine. The most obvious. In 1980 the United States has more than 140 10000kN clamping force TodayHot large injection molding machine into the towel field, by the year of 1985 to more than and 500 units. Japan famous machine company has successfully created the worlds largest injection molding machine, the clamping 8 force of 120000kN, injection volume of 92000g. Widely used CAD/CAE / CAPP / CAM application of computer technology in plastic manufacturing industry, promote the rapid development of Chinas injection molding machine R both material transfer and screw plasticizing function, so to channel depth of screw structure and reasonable arrangement of different functional sections. Because the molten resin is easy to stagnate in the heating barrel and thermal decomposition, so to design a reasonable plasticizing device to ensure the molten plastic can be heated uniformly, at the same time, in order to achieve the injection pressure, must have reasonable structure design of the nozzle to reduce the pressure loss. The general asynchronous motor is used as the driving device, in order to achieve the required speed of the task, it is necessary to design a reasonable transmission device and arrange the position of the transmission parts reasonably. In order to accurately control the injection quantity, the metering device should be designed, and the automatic control of the measurement can be accomplished by the stroke switch. The plunger type injection device is composed of a quantitative feeding device, a plasticizing component, an injection cylinder and an injection cylinder. Plunger injection device has the following characteristics: (1) the plasticizing is not uniform, and the capacity of the barrel is restricted. Due to external heating heating and melting plastic barrel heat from the plasticizing barrel, and the poor thermal conductivity of plastics, plastic movement within the cylinder is in laminar state, close to the cylinder wall caused by high temperature, fast and plasticizing barrel center; plastic plasticizing temperature is low, slow. The larger the diameter of the cylinder, the greater the temperature difference, the more uneven plasticizing,