1. At present, the government advocates nationwide power saving and joint action. According to the "Analysis and Suggestions on Electricity Supply and Demand Situation" issued by the Electricity Regulatory Commission, the provinces with power shortages in China have reached 18. The cumulative power cuts across the country exceeded 140,000, and the accumulated power limit reached 1.9 billion kWh. The shortage of electricity has seriously restricted the development of China's economy. Therefore, the government strongly supports energy-saving and environmentally friendly industries. According to incomplete statistics, there are about 1.6 million sets of existing plastic production machinery in the country, which is increasing at a rate of 15% every year. The heating capacity is 20 million kilowatts, and the daily electricity consumption is about 20 million kilowatts × 0.5 × 20 hours. = 200 million kWh, (0.5 is the machine heating on-off ratio, 20 is the machine's production time per day), according to the calculation of 300 working days per machine per year, the annual consumption of plastic processing machinery in the country is 60 billion kwh. If all the machines are equipped with electromagnetic heating devices, then the national energy saving is about 18 billion kWh, which is 2.3 billion kWh more than the annual power generation of Gezhouba, which alleviates the national power shortage, reduces national investment and reduces enterprise production. Cost has a very positive effect and significance.
2. At present, the competition in the plastics industry is very fierce. How to reduce the cost of products and improve the competitiveness of products is a core problem faced by every enterprise. Electric energy accounts for a large proportion of the cost of plastic products. The use of electromagnetic heating technology can effectively reduce enterprise products. Production costs and increased competitiveness.

Current status and problems of the domestic plastics industry A. Product applicable industry status:
Plastic products, plastic film, plastic granulation, wire drawing, pipe and other production enterprises. At present, the production equipment of these enterprises is heated by the electric heating ring to the barrel and the die, so that the plastic raw materials are melted and plasticized, then injection molded, stretched, and extruded into products.
B. There are problems:
(1) Large heat loss: the heating method adopted by the existing enterprise is wound by a resistance wire, and the inner and outer sides of the ring are heated by both sides, and the heat of the inner surface (close to the barrel portion) is transmitted to the barrel, and the heat outside is large. Part of it is lost to the air, causing a loss of electrical energy.
(2) Increasing ambient temperature: due to the large amount of heat loss, the ambient temperature rises, especially in summer, which has a great impact on the production environment. The on-site working temperature exceeds 45 °C. Some enterprises have to use air conditioners to reduce the temperature, which in turn causes energy. The second waste.
(3) Short service life and large maintenance: due to the heating of the resistance wire, the heating temperature is as high as 300 °C, the resistance wire is easily blown due to high temperature aging, and the service life of the commonly used electric heating ring is about half a year. Therefore, the maintenance work The amount is relatively large.

3. Advantages and characteristics of electromagnetic heaters A. The energy saving effect is better than that of the original resistance wire heating ring, which is more than 30%. Compared with different raw materials and different products, the power saving effect changes. However, the power saving efficiency can reach up to 75% in the products currently used.
B. Good environmental performance can significantly reduce the ambient temperature.
C. Long service life The continuous running temperature of the heating coil is only about 100 °C, and there is no problem of heating coil replacement. Heating is reduced relative to the original resistance wire.
D. Increased product yield Thanks to its high heat generation efficiency, it can significantly reduce heating time and increase product output.

Pelvic External Fixation

There are two kinds of external fixations for pelvic fractures, namely temporary fixation and therapeutic fixation.

Temporary fixation depends on on-site assistance. Assuming that the patient has serious open injury, severe hemorrhagic shock, and serious fracture dislocation, the rescue personnel will provide temporary external fixation support to maintain the stability of the pelvis, reduce secondary injuries, and correct the continuous aggravation of hemorrhagic loss on the scene. The therapeutic external fixation stent is used to correct the dislocation of the fracture through routine examination after admission, evaluation of the injury, and external fixation installation through treatment, maintain the relative stability of the fracture, create a very quiet environment for the fracture healing, and lay the foundation for the healing of the fracture. External fixation is an important method for pelvic fractures.

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