仟Yida injection molding machine inverter energy saving principle

First, the energy saving principle of the inverter of the Yida injection molding machine: 1, the frequency conversion energy saving is known from the fluid mechanics, P (power) = H (pressure), the flow rate Q is proportional to the square of the rotational speed n, and the square of the pressure H and the rotational speed n In proportion, the power P is proportional to the cube of the speed n, Q/Q=n/n, H/H=n/n where: Q-oil pump rated flow, H-oil pump rated pressure, P-oil pump motor rated Power, rated speed of the n pump motor. It can be known from the above formula that if the power of the oil pump is constant, when the required regulating flow rate Q is decreased, the rotational speed n can be proportionally decreased. At this time, the shaft output power P of the oil pump is reduced in the established relationship, that is, the power consumption power P of the oil pump motor and its rotational speed n Approximate party relationship. For example, if the rated power of an injection pump oil pump motor is 55KW, when the speed drops to 4/5 of the original speed, the power consumption is 28.16KW, saving 48.8%; when the speed drops to 1/2 of the original speed, Its power consumption is only 6.875KW, power saving 87.5%.2, dynamic power factor compensation energy saving without power not only increases line loss and equipment heating, but also mainly because the power factor decreases and the active power of the grid decreases. By the formula S = P + Q, Q = S * SIN фP = S * COS ф, where: S - apparent power, Q - reactive power, P - active power, COS ф power factor. It is known. When COSφ is larger, the active power P is larger. The COSф value of the ordinary quantitative pump injection molding machine is between 0.6 and 0.8, and after using the speed control energy-saving control device of the Yida Yida injection molding machine, the COSф≈1 is reduced due to the effect of the filter capacitor inside the inverter, thereby reducing the reactive power. Loss increases the active power of the grid. 3, soft start energy saving Because the motor is direct start or Y/D start, the starting current is equal to (3-7) times the rated current, which will cause serious impact on the motor equipment and the power supply grid, and will also require too much power grid. The high current and vibration generated during startup are extremely unfavorable to the service life of the equipment. After using the energy-saving device of the inverter of the Yida Yarn injection machine, the soft start function of the inverter will start the starting current from zero, and the maximum value will not be used. Exceeding the rated current reduces the impact on the power grid and the capacity requirements, prolonging the service life of the equipment and the mold.

Second, the principle of energy-saving transformation of the inverter of the injection molding machine: 1. The process of molding the injection molding machine The injection molding machine is mainly used for the molding of thermoplastics. The molding process of the injection molding machine is a process according to a predetermined periodic action, that is, a mold is used to advance the rubber to maintain the pressure sol, and the cooling-opening-out product ejector rod is returned to the mold clamping process to achieve a certain product molding. The injection molding machine usually adopts a hydraulic reduction transmission, and its structure includes an injection device, an opening and closing device, a hydraulic transmission device and an electric control device. The latter function is to ensure that the injection molding machine is pre-finished according to the process (pressure, Speed, temperature, time, position) and motion programs work accurately and efficiently. In the traditional injection molding machine, the hydraulic transmission mainly consists of an oil pump, a hydraulic control, a pressure electromagnetic proportional valve, a flow electromagnetic proportional valve, various operating cylinders, a pump motor and other hydraulic accessories and pipes, wherein the oil pump is a quantitative oil pump. The motor usually provides rated power and speed. The oil pump converts the mechanical energy input by the motor into pressure energy, and then delivers hydraulic oil with a certain pressure and flow to the hydraulic components of the hydraulic system to meet the energy requirements of the hydraulic actuator to drive the load. 2, 仟Yida injection molding machine frequency converter speed control energy-saving device control system according to the injection molding machine process requirements, using the injection machine computer's synchronous control signal and electrical control, from the injection molding machine's pressure electromagnetic proportional valve and flow electromagnetic proportional valve respectively The analog current signal of 0-1ADC is directly added to the input terminal of the inverter, thus changing the output frequency of the inverter of the injection molding machine, that is, changing the rotation speed of the oil pump motor to change the output flow Q of the oil pump motor to meet the injection molding machine. The amount of oil pump pressure and flow rate required in each process converts a conventional metering pump into a metering pump.

Third, the preface For the plastic products industry, electricity consumption is the main part of its production costs, and injection molding machine is one of the main energy-consuming equipment of plastic products factory, so reducing the energy consumption of injection molding machine has become the injection molding industry to reduce costs and improve products. An effective way of competitiveness. At present, most of the injection molding machines belong to the hydraulic transmission injection molding machine. The power in the hydraulic transmission system is provided by the motor driven oil pump. During the injection molding process, the flow rate and pressure required by the injection molding machine under different processes are different, and the flow valve must be relied upon. And the pressure valve regulates the flow and pressure required for different processes. The load on the hydraulic system varies greatly. Since the dosing pump cannot adjust the output power, the excess energy can only be consumed in the baffle, the oil leakage, and the oil rise. This not only aggravates the wear of various valves, but also causes excessive oil temperature, excessive motor noise, and shortened mechanical life. And usually in the design, the capacitance of the user's oil pump motor design is much higher than the actual needs, there is a phenomenon of "large horse-drawn car", resulting in a large amount of waste of electrical energy. Therefore, it is of great significance to reduce the energy waste by promoting the application of the inverter speed control device of the Yida Yida injection molding machine on the injection molding machine.