Comes as today's world economy, the enterprise survival pressure is great, and plastic industry competition is very fierce, how to reduce the product cost, improve the competitiveness of the products, is a core problem, each enterprise and electricity occupies a large proportion in the cost of a product in the plastics industry, plastic enterprises to save electricity, reduce the production cost naturally care about very much. At present, the market on plastic mechanical electromagnetic heating energy-saving transformation technology has caused the attention of many enterprises and use, in fact, electromagnetic induction heating technology as early as 80 years ago, and in other industries many applications, such as: heat treatment of steel, household induction cooker and other aspects. Just use in plastic machinery heating energy-saving renovation or in recent years, its basic principle is to use electromagnetic induction principle to produce 20 ~ 25 KHZ ultrasonic frequency electromagnetic wave, the induced by plastic machine cylinder itself produces eddy current to generate heat, because this way are heated body itself fever, the thermal efficiency can reach more than ninety percent, and need to solve in the traditional way of resistance heating conduction through the air thermal efficiency is low, the way of resistance heating thermal efficiency can reach sixty percent, only commonly some lower to thirty percent, as a result, using electromagnetic heating mode for plastic machinery, Can have obvious effect of saving electricity, and can reach at least 30 percent, some of the original thermal efficiency is not high machinery can reach 80 percent. However, in general, there are some problems that need to be paid attention to in the electromagnetic heating products on the market at present, which are also matters needing to be fully understood before the majority of plastic enterprises and industry personnel want to carry out the electromagnetic heating energy saving transformation:

A, electromagnetic heating control circuit board will often burn out?

At present, many enterprises in the market say that their control circuit board will often burn out after they adopt electromagnetic heating controller to carry out the transformation. This problem gives them a headache, and also makes those enterprises who want to carry out the transformation shrink back, and even question this new energy-saving technology.

The cause of the above situation, mainly caused by the concept of electromagnetic heating energy saving technology a lot of interest in the industry, is also very popular with the enterprise, to engage in or are manufacturers in the industry and service point is numerous, we rush to the battle, too late or no ability to do the necessary to the electronic control technology, using induction cooker control board application directly to the industrial requirements of plastic machine installation, even some of the original do induction cooker manufacturers directly using the original induction cooker movement to use intact.

Of course, electromagnetic oven circuit board itself is not a problem, if it is used to produce electromagnetic oven will be very stable, will not burn out, and can have a certain service life. But not a used in plastic machinery, because plastic machinery and there is a fundamental difference in the use of the electromagnetism environment, the use of plastic machine environment is induction cooker as household electrical appliances more complicated, the industrial environment exist in the power grid voltage instability, all sorts of all sorts of machine between the harmonic interference, etc., can cause circuit board is not very durable, often burn out. Actually household induction cooker really is every day work time is only 2 ~ 3 hours, and plastic machine work an average of 12 hours a day, some manufacturers of the machine use longer, as a result, industrial electromagnetic heating and the induction cooker have essential differences, whether in the circuit board in the design of circuit protection scheme and the selection of electronic components on demand is different, from the electronic components for several levels of civil, industrial, and military, industrial-grade electromagnetic heater will need to use the level of industrial-grade above, otherwise often burn out controller is inevitable.

Ii. Precision of temperature control?

Plastic machine heating is an important indicator to guarantee the machine each temperature zone temperature of pure sex truly, all kinds of plastic raw material for temperature sensitivity, although different, but in the process of production for temperature of pure sex requirements are relatively high, a lot of plastic product requirements but not more than + / - 5 ℃ temperature, therefore, many kinds of plastic machine adopts air cooling or water cooling control, otherwise, processing of things may not be a waste product is defective. Because the heating mode of electromagnetic heating is different from the original resistance type, it is difficult to solve this problem without reasonable configuration and technical control. To solve this problem, we need to fully understand the characteristics of plastic machine on the basis of the use of electromagnetic heating control board PID proportional calculus regulator, coupled with the necessary air cooling, water cooling device, to achieve accurate temperature to ±1℃ is also possible. Of course, this needs to be installed in the electromagnetic heater at the same time, but also to the plastic machine performance and plastic raw materials have a full understanding and necessary reasonable configuration.

How much electricity can electromagnetic heating save?
Saving energy is only saving, it can't create new energy. At present, the resistance ring heating method is mainly used in the production of plastics industry. This heating method mainly relies on the single-side contact conduction to transfer the heat energy. At least 50% of the heat energy in this heat transfer method is dissipated in the air. Therefore, the so-called energy saving is to save the part of energy dissipated in the air. Theoretically, the traditional heating ring transmits half of the heat inside and outside, so according to the law of conservation of energy, theoretically, the electricity saving rate of electromagnetic heating should be 50%, and in actual use, the electricity saving rate should be about 40%.

But because plastic machinery relies on the screw rotation to push the material forward, the material between the screw and the barrel, has a great friction force, and the force is related to the speed of the screw, that is, the faster the speed, the greater the friction force, the friction force will usually be converted into the form of heat. In other words, as long as the screw is spinning fast enough, it can generate enough heat. This relationship is usually taken into account in the design of the molding machine, but due to the limitations of the current mechanical design and manufacturing capacity, many of the equipment is difficult to achieve an ideal state, and uneven. Under this premise, some equipment after modification to exactly achieve an ideal heating state, that is, the screw rotation produced by the heat slightly more than the heat required for production and processing, then there is no need for additional heat, in this case the power saving rate will be much more than 50 percent of the theoretical value, up to 80 percent. Therefore, the electromagnetic heating energy saving technology in plastic machinery is normal power saving rate is about 40 percent, high in special cases up to 80 percent.