Explanation using the intermediate frequency furnace technical specification for you

Explanation using the intermediate frequency furnace technical specification for you    
           
My company main circuit adopts expert explains to the intermediate frequency furnace device "ac - dc - ac transformation system by three-phase fully-controlled bridge rectifier circuit, inductance, wave circuit of inverter circuit in parallel, on the basis of the following:
(a), rated input devices: three-phase alternating current (ac), frequency of 50 hz (60 hz), line voltage is 380 v (high pressure equipment is 660 v, 750 v, 950 v, 1050 v, 1250 v, 1450 v, etc)
(2), equipment rated output: as shown in chart a; Under the rated voltage or rated load, the output power can be smooth, continuous adjustment, the adjustment range is 5% - 100% of the rated power;
(3), can prevent overvoltage switching operation (such as QF open and close, the RS fuse, etc.);
(4) when the output voltage 1.1 1.2 times better than the maximum output voltage or over voltage setting value, the overvoltage protection system action, make the device automatically stop working, and send out alarm signal, over voltage indicator light meter box;
(5) when the inverter bridge through short circuit protection system action immediately, make the automatic stop device, had concurrent flow indicator - flow indicator light meter box;
(6) as the output current more than setting value, the protection system also make the automatic stop device, had concurrent flow indicator - flow indicator light meter box;
(7) the water-cooling system working pressure is lower than a certain value, the function of automatic stop, and light up the water indicator on the panel;
(8) the machine set a limited flow, pressure limiting link, make the input current and output voltage limit within the set value.

Induction melting furnace operation points and maintenance

Induction melting furnace operation points and maintenance

The induction melting furnace maintenance and maintenance
1. The furnace body, instrument and control cabinet should be always kept clean.
2. The fire inflammable and explosive articles shall be stored in 2 m around.
3. The surface of the furnace shell paint should remain intact, besmear to brush on a regular basis.
4. The temperature higher than 400. 12, not for a long time to open the oven door.
5. Use the furnace temperature shall not exceed the maximum rated temperature.
6. Regular repair and improve the front seal measures.
7. To lubrication of mechanical transmission parts regularly.
8. Regularly check whether the graphite heater terminal clamp, and tighten.
9. The corrosive substance and moisture artifacts must not be into the furnace heating.
10. Graphite heater once connected to each other, there should be timely when the power is separated.
11. Regularly clean up furnace bottom residual scale and other impurities.
Of the maintenance of the induction melting furnace
Induction melting furnace heating power after school with furnace using the extension of time, the thermal resistance of heat insulation screen to smaller, volatilize electric heating element and resistance is larger, the influence of such factors as power should be appropriately increased. In production practice, with experience and determine the power calculation method as shown in figure 4, 15 for the graphite felt or refractory fiber felt heat insulation screen vacuum furnace volume and heating power relationship graph. According to the figure 1300 can be determined. The vacuum furnace heating power of the C. If metal heat insulation screen vacuum furnace, was to check the heating power of the need to increase by about 30%.
Heat insulation screen maintenance screen in vacuum furnace and heat insulation, heat preservation effect, sometimes as a fixed structure foundation of heater. Heat insulation screen structure in general there are four types: full metal heat insulation screen, mezzanine type screen, graphite felt heat insulation screen and mixed felt heat insulation screen. Different heat insulation screen, should grasp the key points in maintenance.

Intermediate frequency furnace steelmaking has the following advantages

Intermediate frequency furnace steelmaking has the following advantages

1 simple, intermediate frequency furnace equipment. Compared with electric arc furnace, intermediate frequency furnace itself does not need large furnace equipment, don't need a large furnace equipment (such as hydraulic pressure, rotating mechanism, etc.), also don't require a lot of water cooling system, so its monomer equipment investment is relatively low, the equipment is simple and easy to master.
2, only has the function of the steel because of intermediate frequency furnace, no oxygen blowing in steelmaking process, so don't oxygen generator and other large equipment, it can also save money.
3, due to the small size, medium frequency furnace height is low, so the factory also was much lower than other steelmaking workshop, therefore, its cost in the factory building construction is also less than other types of steelmaking plant.
4, small and intermediate frequency furnace capacity, production arrangement is more flexible, especially suitable for small single piece casting production.
5, in addition, power frequency furnace and its related technology level is low, short-term easy to grasp.
6, the most low-end products in the market demand is not high, intermediate frequency furnace comprehensive cost is lower than other steelmaking process.

The principle of vacuum furnace and structure

          The principle of vacuum furnace and structure

Vacuum furnace is mainly composed of furnace, smoke tube, heating coil and a chimney. Using the negative pressure of steam heat exchange technology, the runtime will be used as heat medium of the liquid level control between the smoke and fire tube and the heating coil, the pressure in the furnace is made by high temperature exhaust gas pressure, operation and control the negative pressure condition. Full combustion of fuel burner, heating tube and the fire heat pipe is passed to the pot shell intermediate medium water, boiling water is heated by the liquid into gas phase evaporation, water vapor gradually filled with gas phase space of the furnace body, because the coil is the heating medium and the tube wall temperature is lower than the steam temperature, so that the vapor in the outside wall of the condensing coil, and the heat transfer medium to coil. After the condensation water in gravity whereabouts backwater space. Cycling heat process was realized. To take the negative pressure of heating furnace operations, mainly considering the security issue, the normal pressure will cause the high temperature furnace flue gas leakage, heat loss increase, not only will cause the destruction of the stove itself and the harm to personal safety.

Vacuum induction melting furnace using the matters needing attention

Vacuum induction melting furnace using the matters needing attention

For induction melting operation must be careful and cautious when, in the process of operation should be more pay attention to personal safety, at the same time providing protection equipment as well.
During vacuum induction melting operation part, should be carried out in accordance with the relevant operation process, if not in accordance with the operating rules, is easy to vacuum pump body is damaged, resulting in a serious accident, will not only harm health, life and damage to equipment will also have a certain role.
In smelting operation, should beware of electric shock, such as electrode, rotating electrode copper wires, copper power supply box with a certain capacity, so be sure to properly insulating protection, so it can avoid electric shock. At the same time also need to protect good eye, if the temperature is too high, need to cover the observation hole of the baffle, if is necessary, you will need to wear sunglasses.
In the smelting, attention should be paid to keep a good environment, pay attention to ventilation, need the mechanical pump out of the trachea leads to the outside of the window. To dry the floor at the same time also need, there is no water. In the whole process of smelting, shall guarantee the circulating water can be a normal cycle.

A brief introduction of medium frequency melting furnace

A brief introduction of medium frequency melting furnace

Medium frequency melting furnace is a kind of will power frequency 50 HZ alternating current into intermediate frequency (above 300 HZ and 20 k HZ) power supply device, induction coil, deserve to go up and compensation capacitor, applying the principle of electromagnetic induction heating equipment, widely used in non-ferrous metal melting, heating.
 Such as molten pig iron practice, ordinary steel, stainless steel, tool steel, copper, aluminum, gold, silver and alloy, etc.; Diathermy forging USES the steel parts, copper parts, used for extrusion forming of aluminum ingots, tempering, quenching heat treatment of metal. Medium frequency melting furnace heating device has small volume, light weight, high efficiency, the advantages of hot working quality and favorable environment, are quickly eliminated coal furnace, gas furnace and oil furnace and ordinary resistance furnace, is the new generation of metal heating equipment.
 Medium frequency melting furnace is a main equipment in the foundry, stability, reliability and security of its work is flow process of casting production line ensure normal and stable work.

Medium frequency induction furnace

Medium frequency induction furnace

Intermediate frequency furnace power supply system is one of the biggest amount of harmonic in power system harmonic source, common has the power of the medium frequency furnace and high frequency induction furnace. The six pulse intermediate frequency furnace, mainly produce 5, 7, 11, 13 second-class characteristic harmonic; For 12 pulse converter medium frequency furnace, mainly produce 11, 13, 23, 25 inferior characteristic harmonic. In general, small converter device adopts 6 pulse, relatively large adopts 12 pulse. Such as furnace transformer connect/delta Y/Y type, or to use two electric furnace transformer power supply.
For intermediate frequency furnace filter unit, we have many successful running of equipment. General design of two or more circuit, combined filtering methods for harmonic governance:
1, according to different medium frequency furnace, provide you with special filter and reactive power compensation of complete sets of equipment;
2, according to different management goal, the demand of the actual working condition, we reasonable design filter compensation scheme for you;
3, according to the actual number of intermediate frequency furnace and the load distribution, reasonable design is a single governance medium frequency furnace, or more than one centralized management;
4, according to your actual demand of industrial, we reasonable design filter compensation scheme for you, to meet the diverse needs of your industrial and mining.

The structure of the medium frequency melting furnace

The structure of the medium frequency melting furnace

Medium frequency melting furnace furnace shell structure is divided into two kinds of aluminum and steel shell structure: small capacity furnace shell generally adopt aluminum alloy material, reasonable structure small volume, convenient installation, simple maintenance, low maintenance cost. Large capacity of intermediate frequency furnace shell adopts steel structure, furnace body structure is composed of the fixed frame of blast furnace and ontology, furnace fixed frame and the furnace USES the integrity of the skeleton structure. Furnace body is rotated by a hydraulic system control, depend on either side of the furnace to achieve two hydraulic cylinder jacking, and furnace is reset by the pressure of the furnace body weight of produce.
Furnace iron liquid height and diameter is quite high. This reference foreign advanced type furnace, furnace is set on the basis of computer analysis, slim than increase, improve natural power factor, power efficiency was improved. Furnace built-in copying yoke, magnetic yoke block can reduce the magnetic flux leakage, prevent furnace heating, improve efficiency. At the same time as supporting effect, induction coil, fixed yoke furnace to achieve high strength and low noise. Yoke is to use cold rolled silicon steel sheet, stainless steel plate produced by crescent-shaped yoke, the combination of core and coil surface for circular arc surface, pressure JinChu is a surface rather than a line in the past, the structure of the compaction effect is good, less magnetic flux leakage. For the silicon steel sheet pile, instead of a cast, a splint dedicated to tighten, without special wear heart screw tightening, this structure can make full use of the permeability of silicon steel sheet area, reduce the probability of local heating.

Characteristics of medium frequency furnace melting furnace series

Characteristics of medium frequency furnace melting furnace series

(1) melting with high efficiency power-saving effect is good, compact structure, strong overload capacity.
(2) low temperature around the stove, smoke less, good working environment.
(3) simple technology, melting operation and reliable operation.
(4) metal ingredients evenly.
(5) melting heat up fast, easy temperature control, high production efficiency.
(6) high utilization rate of intermediate frequency furnace, easy replacement of varieties.
(7) long arc yoke shielding magnetic flux leakage and reduce the external magnetic resistance, shielding at the ends of the coil magnetic flux leakage and magnetic yoke cross section is the inside of the arc at outside Wall seamless to increase the effective permeability area, make the better support. Unique positive and negative spiral coil greatly improve the efficiency of the system.