A preface.
In China has lasted nearly two years of the shortage of electricity supply, by 2004 the situation is more serious, in the first half of electricity provinces have reached 24. In the first half of this year, demand for power by 9.7% of GDP growth, to continue rapid growth, and the industrial electricity continue to maintain rapid growth, high electricity power industry growth is high "characteristics. While power supply capacity increase co., LTD., with persistent in short supply situation, the contradiction between supply and demand of electricity tension, further expanding scope of power shortage and continuous power shortage area.
For plastic products industry, power consumption is the main part of the cost of production, and injection molding machine is one of the main energy consumption equipment of plastic products factory, the energy consumption of the injection molding machine become injection molding industry, reduce the cost, the effective ways to enhance the competitiveness of their products.
Currently the vast majority of injection molding machine belong to hydraulic injection molding machine, hydraulic drive system of the power provided by the motor to drive oil pump. Changes in the process of injection molding cycle, the injection molding machine under different process flow and pressure, must depend on the flow valve and pressure valve adjustment needed for different process flow and pressure, and the change of load is very large, because the quantitative pump shall not adjust the output power, so the excess energy only in baffle, oil leakage, oil temperature rise in consumption, exacerbated by a variety of valve wear and tear, and the oil temperature is too high, the motor noise is too big, and the phenomenon such as mechanical life expectancy. And often in the design of the motor capacity is a lot higher than actual need, exists the phenomenon of "big horse car", cause the volume of the waste electricity. Therefore push hand in place in the application of injection molding machine, is of great significance for reducing the energy cost.
2. Injection molding machine working principle and the necessity of modification
Injection molding process is generally divided into the following steps: the clamping and injection pressure to plastic material, cooling stereotypes - > open mould thimble. Each completed action, there is time, pressure, speed, the combination of several parameters, such as location, that is to say, in a certain position has a corresponding displacement pressure and velocity, and the pressure in a different position and time and speed are variable. Terminated at the same time after completion of each action signals to the program controller, after receiving the signal to make the execution of a program controller action of instructions. Injection molding machine system itself also has some weaknesses:
First, injection molding machine has a very intense internal movement of the mutation process, such as the clamping process, fast clamping to slow low voltage protection mode, the operation condition of the high speed clamping mutation is very severe; Like the injection process, the slow injection to fast to slow, fast, slow shot glue process condition is also very severe, the impact on the machine is very big, affect the service life of the injection system.
Second, the action of hydraulic brake can not meet the design precision, the opening of the hydraulic braking depends on the solenoid valve, and the action of electromagnetic valve controller provides the voltage and current, depending on the process for most of the injection molding machine are not dead cycle control, valve opening and closing precision will sell at a discount greatly, especially the degree of opening and closing valve under 10% and 90%, an action is performed under the condition it is difficult to ensure the stability and repeatability.
Thirdly, the oil cylinder action itself has damaged oil seal, inside leaking phenomenon, reliability and stability of the action is not high. This is because most of the time, the load of the actual fuel consumption are less than the oil pump, part of the hydraulic oil pressure condition by the overflow valve, proportional valve, hydraulic components such as overflow. The overflow part not only did not make any useful work, and to generate heat, cause the hydraulic oil heating, energy consumption, and harmful. Adopts servo non-inductive vector operation of injection molding machine, can well solve these problems, can not only improve the precision and stability of the whole injection system, to reduce the huge mechanical shock, lengthen the service life of the system, and can save a lot of electricity.
Fourth, many clients before the inverter control technology of V/F control mode and the replacement of the synchronous servo oil pump and motor control to achieve high efficiency energy saving effect, the vector control in the servo precision non-inductive of our company and synchronous servo compared under the condition of our servo is better than synchronous servo. Advantages are: servo precision non-inductive without replacement motor and oil pump (advantages), synchronous servo motor and oil pump must be replaced (disadvantages) synchronous servo not only in every action in the injection molding machine can adjust injection molding machine control system panel (disadvantages) servo precision non-inductive vector can be without changing the original control method can can regulate the flow of all the action of injection molding machine size and speed torque control (advantages).
Hundred million source for industrial equipment such as plastic machine, drying machine, extrusion machines, injection molding machine, vulcanizing machine design efficient insulation solutions, such as professional aiming at the defects of traditional injection molding machine high power consumption, asynchronous servo transformation efficiency can reach 30%, 60%, let you more power saving money, but also more market competitiveness. Hundred million source professional energy saving transformation, www.yybaowenzhao.com, for more information please contact: 0512-81869161