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Shijiazhuang Faith Machinery Co.,Ltd serves as a supplier of Steel Conduit Pipe Mills, offering equipment that produces conduit tubes for electrical wiring, structural supporting, and protective applications. These mills are designed for efficiency, high repeatability, and compliance with industry conduit standards such as ANSI C80.3 and EN 61386.
Production Line Layout
The Steel Conduit Pipe Mill begins with a mandrel-expansion decoiler that accommodates pre-galvanized strip widths from 25 mm to 60 mm and thicknesses from 0.6 mm to 1.5 mm. A four-high tension-leveling unit removes camber. Forming stands arranged in a compact straight-line guide the strip through multiple bending sequences, culminating in a seaming roll that closes the tube’s “U” into a complete conduit.
Welding and Heat Management
High-frequency welding heads operating at 200 kHz to 500 kHz deliver consistent seaming heat, optimized for thin-wall conduit to prevent coating burn-through. Water-cooled induction coils and temperature-controlled weld rolls maintain the weld zone within narrow temperature bands. Post-weld squeeze rolls ensure intimate edge contact, essential for weld strength and conduit straightness.
Sizing and Compliance Testing
Downstream calibration stands refine outer diameter to ±0.1 mm accuracy, while inline laser systems verify concentricity and ovality. A segmental hydrostatic or air-leak test station can be integrated to confirm conduit integrity under pressure conditions specified by conduit standards. Compliance data—including diameter readings and test pressures—are recorded for quality certification.
End Preparation and Handling
Flying cut-to-length saws produce conduit lengths from 0.5 m to 6 m, with end squareness and burr removal managed by automatic deburring tools. Tubes are then directed to collection conveyors or inline stacking systems, which organize and prepare bundles for shipping.
Control Architecture and Data Traceability
A Siemens or Mitsubishi PLC network links decoiler, leveler, forming stands, welding head, and downstream modules. Operators manage recipes for different conduit sizes via an HMI touchscreen. Key metrics—line speed, weld current, calibration roll gap—are archived in an SQL database, facilitating audits and enabling continuous improvement.
After-Sales Services
Shijiazhuang Faith provides full installation supervision, from civil foundation alignment to electrical hookup. Operator and maintenance training programs cover roll alignment, weld head maintenance, and compliance test procedures. A preventive maintenance plan—covering roll shaft lubrication, coil tension arm checks, and sensor calibrations—ensures sustained conduit quality and machine availability.
