Abstract: This article describes the building materials industry, frequency control, the first description of Cement Process pipe machine, and then focuses on transforming the situation and precautions, and after transformation Energy The quantitative analysis.
Keywords: concrete pipe machine, frequency control, electromagnetic governor, analysis and calculation of energy consumption
I. Introduction With the rapid development of cement and its products in the infrastructure sector has played a huge role, the industry has witnessed a vibrant and prosperous scene. However, the industry study and the introduction of equipment from abroad in time, equipment at home for the time back about 70 years in the last century has been finalized. Over the years, most of the equipment manufacturers not to adjust product structure, there is no in-depth development, and not continue to introduce new technology in use last century's technology for production of 70, Speed of approach to electromagnetic speed most of the main , resulting in a large number of high energy consumption, performance and low cement products equipment to enter the market, and these very low energy efficiency of equipment has been running a lot of power consumption.
Cement pipes easily processed, wide variety of sources of raw materials, low price, long life, and, in the construction, municipal construction has been widely used. Construction of cement pipe for its convenient, time saving, labor saving and reliable, and cost is relatively low, a large number for highway, bridge, building foundation, embankment, pier infrastructure.
Second, the process of cement pipe
Cement pipe is one of the many cement manufactures, it has a variety of production processes, in order to ensure uniformity of cement pipe wall thickness, compactness, of which the most common production and processing technology is the centrifugal casting method. Centrifugal casting is good ingredients will be completed in the concrete into the mold cavity, the first for low speed, mixing evenly Motor L speed to medium speed, the basic shape under the action of centrifugal force, and gradually compacting concrete, and then dehydrated through high-speed molding, the whole process end. The production of cement pole is similar to the centrifugal casting method, the production process and this much the same.
Centrifugal casting method Electric Require a higher transmission equipment, the first full start requirements, motor starting torque should be more than 100% of rated torque; followed by low-speed operation of the long, low-speed torque requirements; Finally, since the tube motor speed range, to ensure the cement pipe pile the quality of the work required in the whole speed range, speed stable. Early speed methods are mechanical Classification Speed, commutator motor control, DC speed, electromagnetic speed, etc.. As the electromagnetic speed of simple structure, ease of use relatively low prices, therefore, in recent years in the cement pipe equipment, electromagnetic governor used more. However, low efficiency of electromagnetic speed, maximum speed of 85% when the efficiency, speed, the lower the lower the efficiency. Low-speed centrifugal forming process cement pipes accounted for 50% of the time, the electromagnetic energy at low speed speed speed considerably.
Cement pipe machine load mechanical characteristics of the high inertia loads, cavity before starting a need to add a little pile of cement concrete quantitative, starts to run low, obviously heavy start. Electromagnetic governor low speed mechanical properties of soft, low-speed torque less, to ensure normal production, choose a larger capacity motor, which in turn makes further increase in energy consumption. General electric drive system control unit 1 set by the 75kW (55kW) of the electromagnetic speed motor drive. Electromagnetic timing motor speed range is limited, and low-speed torque has less, but concrete requirements for low speed torque, and can not meet the instability occurs when the speed and may even fail to start. Speed instability on product quality to a certain extent. In addition, the 4 pole AC induction motor rated speed is 1440r/min, but the maximum can only be transferred to electromagnetic Speed 1200r/min. High-speed, on the improvement of the quality of cement pipes useful. Pipe machine from the above requirements on the electric transmission point of view, is the electromagnetic governor had no choice. Now Inverter Prices have dropped to a reasonable level to the high performance inverter system can satisfy the requirements management process, instead of electromagnetic speed with frequency control is the best option. I am an expert from China Auto Suppliers, usually analyzes all kind of industries situation, such as armored motorcycle jacket , brown motorcycle jacket.
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