The plant is provided with the following parts :
- Medium Frequency Converter
- Tilting Melting Furnace
- Framework with stairs and gangway
- Grain Producing Tank type RPG/B
TECHNICAL INFORMATION
- MEDIUM FREQUENCY CONVERTER
- Nominal power M.F. 100 kW
- Working frequency 3,5 KHZ
- Max voltage M.F. 550 V
- Power of connection to the plant 120 kVA
- Power supply voltage (3 Phase/50 HZ) 380 V ± 6%
- Power factor (cosF‑i) 0,9
- Cooling power required (generator/furnace) 51400 Kcal/h
- Cooling water temperature in input 30°+35°c
- A 1 Equipment of power grid and connection 50Hz.
- They include the stage of sectioning performed by means of a thermal‑magnet, as well as the stage of secondary protection made up of extra quick fuses for semiconductors.
A 2 AC/DC converting device- It is of the threephase, entirely controlled type, realized with water cooled power thyristors, and equipped with the necessary auxiliary devices to start and protect against excess voltage and/or overcurrent, as well as to check cooling conditions.
- A 3 Intermediate circuit with direct current
- Made up of a filter with inductive input, obtained by means of a filter inductance of direct current toghether with an equalization capacity of the intermediate D‑C voltage.
A 4 Inverter bridge- It is of the monophase type entirely controlled, realized with "quick" power thyristors, water cooled and equipped with the necessary auxiliary devices to start and protect against excess voltage and/or overcurrent, as well as to check cooling conditions.
- A 5 Electronic unit for control and regulation
- It is made according to the modern technic of the single card which carries out the pilot function for the SCR of straightening and inverter bridges. It also regulates the loading power, and controls current, tension and temperature values, blocking the plant as a self protective measure in case of need.
A 6 Command system, signaling and measurement- It includes the command devices and the pilot lamps of the converter working conditions, as well as the selective signaling of failure conditions and the potentiometer regulating the voltage M F and, therefore, the power delivered.
- A 7 Heat exchange group for the cooling of the converter
- The cooling cycle of the converter is "closed" with demineralized water, cooled by means of a water ‑ water plate exchanger with counter current exchange. The refrigeration group, including the above mentioned exchanger, is modular and equipped with motor pump storage tank, as well as the necessary command, regulation and control systems. Obviously it is necessary to supply the exchanger with water coming from a water cooling plant at closed cycle (our model IRA), or from one of your plants, but on conditions that the water caracteristics are like those above mentioned.
The above elements, which make up the converter, are placed in a locker built in sheet with strong welded frames and equipped with front and back dustproof doors.
Degree of protection IP 54.
THREE‑PHASE POWER SUPPLY TRANSFORMER
- Nominal power 120 KVA
- Primary nominal voltage of power grid (+‑2,5+5%)
- Secondary voltage loadless 400 V
- VCC% min. 5%
- MELTING FURNACE
- The furnace structure is made up of a strong iron frame with stainless steel sides. The coil for the induction heating is immersed in refractory cement. Both crucible and coil are held in a sindanium casing of adequate thickness.. The crucible spins around an imaginary axis passing through its edge. The furnace also has a propane gas burner to protect the metal and the crucible from oxidation. A timer automatically stops both propane gas inflow and coil cooling-pump about 40 or 60 minutes after the converter has been stopped.
Capacity of the crucible: 110 Kg of silver
Technical data of the Grain Producing Tank Type RPG/B
The container is used both for the production of metal balls
It is made entirely out of stainless steel and is cylindrical in shape with a truncated cone bottom. The tank is fitted with a special discharge cap and rapid opening for the discharging the grit. It also has a centrifugal pump for moving the water and for partial emptying.
Furthermore, it is supplied with a stainless steel frame for the supporting the perforated graphite container in which, after heating, the molten metal is poured.
- Power supply : three-phase
- Power : 0.4 Kw
- Capacity : 300 lt
- Overall dimensions : 840x830x1650mm (length-width- height)
- Weight : 50 Kg
Ex-Factory, Italy
Price: € 110.800,00
Packing: TBD
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