12 Stations PLC Control Flexible Duct Connector Machine for 0.3-0.6 mm Galvanized Sheet Flexible Connection Production Line

This flexible duct connector production line is dedicated automatic equipment for manufacturing HVAC flexible duct connectors — the flexible joints widely used between air duct sections, ventilation systems, and building services. It combines galvanized steel edge strips with fire-retardant fabric into one finished flexible connector through a continuous automatic process: decoiling, servo feeding and punching, roll forming, secondary punching, cutting, and receiving.

Unlike panel roll forming machines, this line is built around a narrow-strip forming process. Two electric decoilers feed the galvanized strips while a separate electric recoiler handles the fire-retardant fabric. The strips are roll formed into the clamping profile, punched, and pressed onto the fabric by four sets of stamping and cutting dies. The result is a finished flexible connector with consistent edge geometry and clean punched holes, ready for direct installation on site.

• 1. 12-Pass Precision Forming with Hard-Chrome Rollers

  The forming host uses 12 forming passes to shape the narrow galvanized strips gradually. The main shaft is made of Cr40 steel, precision machined with keyway broaching, ensuring stable concentricity under continuous load. All rollers are made from high-grade GCr15 bearing steel, CNC machined and hard-chrome plated to 0.05 mm thickness on the surface. This combination delivers high hardness, strong wear resistance, and a long service life, keeping the edge profile accurate even after long production runs.

• 2. Servo Feeding and Punching for Accurate Hole Positions

  The line is equipped with a dedicated servo feeding and punching unit. Material feed length is servo controlled, and punching positions are synchronized with the feeding action, so hole spacing stays consistent from the first piece to the last. This reduces manual rework and helps ensure the finished connector fits standard duct flanges properly during installation.

• 3. Four Sets of Stamping and Cutting Dies for Stable Assembly

  Four sets of stamping and cutting dies work together with the hydraulic pump station to complete the pressing and separating actions. The dies press the formed galvanized edges firmly onto the fire-retardant fabric, producing a tight, uniform joint, while the cutting station separates the finished connector cleanly. Stable die structure and reliable hydraulic pressure help reduce downtime and keep daily output steady.

• 4. Dual Electric Decoilers and Electric Recoiler for Continuous Material Supply

  Two sets of electric decoilers supply the galvanized strips, and one electric recoiler handles the fire-retardant fabric roll. Coordinated unwinding keeps material tension stable during long runs, avoiding wrinkling or deviation of the fabric and ensuring the finished product stays flat and evenly aligned.

• 5. Wide Specification Coverage for Different Duct Projects

  The machine processes galvanized sheet from 0.3 mm to 0.6 mm in thickness and 50 mm to 105 mm in strip width, with fire-retardant fabric width from 120 mm to 450 mm. Finished connector width ranges from 180 mm to 600 mm, covering the common specifications required in ventilation and air-conditioning projects. This flexibility allows one machine to serve multiple product sizes without frequent changeover.

• 6. Sturdy Welded Frame and PLC Control

  The machine frame is built from an 80×80 square tube welded structure with 14 mm thick vertical plates, providing solid rigidity for continuous operation. Power is transmitted from the main shaft sprocket to the gear-driven lower shaft, and the whole line is controlled by a PLC electrical cabinet. The machine runs on 380V/50Hz/3-phase power, and other voltages can be customized on request.

• 7. Compact Footprint and Practical Output Speed

  The complete line occupies approximately 3.5 m × 2 m × 1.5 m, making it easy to fit into existing workshops without major layout changes. Output speed is 6–8 m/min, a practical rate for flexible connector production that balances output with forming and punching quality.

Dongguang Hengfu Roll Forming Machine Co., Ltd. specializes in cold roll forming equipment for metal building products. For this flexible duct connector line, we design the forming passes, dies, and feeding system around the actual product structure, so the machine produces a finished connector that meets the dimensional requirements of ventilation projects. Each unit is assembled and trial-run before delivery, and customers can carry out factory acceptance before shipment. We also provide on-site commissioning and free operator training so the line can be put into production smoothly.