First, the principle of energy saving
The die-casting machine is a typical periodic variable load equipment, and a complete production cycle includes the stages of mold clamping, injection, cooling, and mold opening and ejection. Usually the power of hydraulic equipment is supplied by a quantitative oil pump, and the motor that drives the oil pump to work has been running at its rated speed. When the equipment is in operation, the speed and pressure of each link in the production cycle of each product are controlled by the throttle valve and the relief valve in the oil circuit (some are controlled by the proportional valve, the principle is the same). When the pressure and flow supplied by the pump exceeds what is required for the machine, the excess is returned to the reservoir through the relief valve. When the equipment is actually running, the pressure required by each link in each product cycle is different; However, the pressure supplied by the oil pump is the maximum pressure limited by the relief valve. As long as the system does not require pressure at all, there will be unloading, and the motor is in light load operation; At this time, the electric motor still consumes a lot of electrical energy.
In the production process of the die-casting machine, as long as the motor load is large in the high-pressure clamping, ejection and air storage tank pressure storage stage, the motor load in other stages is generally small, and it is in the unloading condition, especially in the cooling stage and air blowing and cleaning, there is a large energy-saving space. For example, after installing a special power-saving control system on the die-casting equipment, the original fixed oil supply can be changed to on-demand supply, and the motor will stop working when the demand is less, and the motor will stop working when there is no demand; As a result, the use of energy can be significantly improved. If it is controlled by pressure and flow, the inverter actively regulates the speed of the motor according to the pressure and flow of the die-casting machine; If the wrong flow pressure is controlled but controlled in sections, the speed of the motor can be actively adjusted by using multi-stage speed, so as to achieve energy saving of more than 20%, so that customers can get a satisfactory economic reward.
Second, the transformation plan
According to the investigation of the power system and structural characteristics of your plant and the analysis of the operation characteristics of the equipment, in line with the economic and effective criteria, it is recommended to adopt the frequency conversion transformation plan and adopt the optional working mode of power frequency conversion, that is, K1 and K3 are closed in the state of frequency conversion and energy saving, and K2 is closed in the state of power frequency (the same as when the inverter is not installed, and it can be easily switched to the power frequency state when the inverter has problems, which does not affect the normal operation of production), and this design enhances the reliability and sensitivity of the system.
3. After the energy-saving transformation
1. The power saving effect is obvious, improving the power factor of the power grid, reducing the reactive power loss, and increasing the capacity of the transformer together to alleviate the pressure of capacity increase.
2. The product is used with the original system, does not change the original electrical circuit, can switch between energy-saving and non-energy-saving conditions, and is easy to use.
3. Due to the decrease in motor speed, the wear and tear of the oil pump also decreases, the noise decreases, the maintenance cost decreases, and the service life is extended.
4. Digital tube display, simple to use, can be sensitive to modify the control parameters according to the needs.
5. There are a variety of intelligent maintenance functions for the motor: such as undervoltage, overvoltage, phase loss, overload, short circuit, etc.
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