AC-DC-AC Insulation Processing Machines , Pipe Welding Machine
MACHINE DESCRIPTION
MAIN MILL(Forming & welding & sizing section,Double DC Motor drive)
FORMING SECTION
1.Main DC motor: SIMO- Z4- 22Kw/1500rpm*1set
2.Main reducer: ZLY type-Carbide-faced cylindrical gear
3.Secondary gear box: 4sets,4pcs output axis type,with spiral bevel gear and circular gear
4.Material of gear box: HT250 cast iron
5.Material of spiral bevel gear: 20CrMnTi
6.Universal joint : 8sets
7.Unpowered entry flattener: 1set(with 10pcs spindles)
8.Feeding guide stand: 1set(with 2pcs vertical rollers)
9. Driven stand 8sets (Horizontal)
10.Driven stand shaft : Ø38mm
11. Material of shaft: 42CrMo
12.Side roller stand : 8 sets(Vertical)
13.Side roller stand shaft : Ø25mm
14. Material of shaft : 42CrMo
WELDING SECTION
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Seam guide stand with 2 rolls: 1 sets(Horizontal)
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Squeeze stand with 2 rolls: 1 sets(Vertical)
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De-burr frame: 1 set
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Seam ironing unit: 1 set(Horizontal)
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Emulsion cooling tank length: 700 mm
Working principle of solid state H.F. welder
Main circuit structure of solid state H.F. welder
Solid state H.F. welder main circuit structure is as follows fig.1; it is a typical AC-DC-AC variable frequency structure. Rectifier adopts 3-phase bridge style thyristor phase-control rectifier circuit, DC side adopts inductor, capacitor to compose LC filter which meet the working requirements of voltage type inverter. The voltage type inverter adopts modularization parallel structure to extend power supply power, each inverter module is single phase MOSFET bridge style circuit connected with series resonance tank circuit by H.F. matching transformer. On one hand, the matching transformer realizes power combination and impedance matching; on the other hand it realizes electric isolation of load and power supply. To put effective and swift protection on over-current malfunction of voltage type inverter, our company introduces special and stable over-current protection circuit which guarantees safe and stable running of inverter.
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