High Efficiency Automatic Operation Flexible Duct Connector Machine Flexible Connection Production Line with 12 Forming Stations

Flexible duct connectors are consumables in ventilation and air-conditioning installation — needed on almost every duct run, yet difficult to make efficiently by hand. This production line turns that manual job into one continuous automatic process: galvanized edge strips are formed, punched and pressed onto fire-retardant fabric, then cut to length and received as finished connectors.

1. 1. Decoiling — Two Electric Decoilers + One Electric Recoiler

   Two sets of electric decoilers feed the galvanized strips separately, while one electric recoiler handles the fire-retardant fabric roll. Coordinated tension keeps the fabric flat and prevents wrinkling or edge deviation during long runs.

2. 2. Servo Feeding & Punching — Length and Hole Spacing Under Servo Control

   The dedicated servo feeding and punching unit feeds material to the set length and punches in sync with the feeding action. Hole spacing stays consistent piece after piece, so finished connectors fit standard duct flanges without on-site re-punching.

3. 3. Roll Forming — 12 Passes on GCr15 Hard-Chrome Rollers

   The forming host shapes the narrow galvanized strip through 12 forming passes. The Cr40 main shaft is precision machined with keyway broaching for stable concentricity; all rollers are high-grade GCr15, CNC machined and hard-chrome plated to 0.05 mm, giving high hardness, strong wear resistance and a long service life.

4. 4. Secondary Punching & Stamping — Four Sets of Dies Plus Hydraulic Station

   Four sets of stamping and cutting dies, driven by the hydraulic pump station, press the formed edge strips firmly onto the fabric and complete the secondary punching. Stable die structure and consistent hydraulic pressure produce a tight, uniform joint.

5. 5. Cutting — Clean Separation at Preset Length

   The cutting station separates the finished connector at the set length, keeping the cut edge neat and the width dimension uniform across the batch.

6. 6. Receiving — Finished Connectors Collected Automatically

   The receiving unit collects the cut pieces, reducing manual handling and keeping the working area clear for continuous production.

One machine covers the common specifications used in ventilation projects, so most orders can be produced without frequent changeover.

The frame is an 80×80 square tube welded structure with 14 mm thick vertical plates, providing solid rigidity for continuous running. Power is transmitted from the main shaft sprocket to the gear-driven lower shaft, and the complete line is governed by a PLC electrical cabinet. The main motor is a 3 kW Shanghai Lichao unit with a cycloidal pinwheel reducer. Standard power is 380V/50Hz/3-phase, and other voltages can be customized to suit the destination market.

The whole line occupies approximately 3.5 × 2 × 1.5 m, so it fits into an existing workshop without major layout changes.

Dongguang Hengfu Roll Forming Machine Co., Ltd. designs the forming passes, dies and feeding system around the actual product structure rather than adapting a standard panel machine. Each line is assembled and trial-run before delivery, and customers can carry out factory acceptance on site before shipment. On-site commissioning and free operator training are provided so the line can start producing quickly.

• Q: What is the delivery time?

  A: Normally it takes about 45 days.

• Q: What service can you provide before order?

  A: We provide full pre-sales service, including answers to all your questions about our machines, such as technical parameters, price, payment terms, etc. If you would like to visit our factory and inspect the machines, we can send you an invitation letter and offer you our warmest welcome.

• Q: Can you finish the machine during the delivery time?

  A: We will complete production on time according to the confirmed lead time.

• Q: Do you have after-sale support?

  A: Yes, we have experienced technicians who can provide professional technical support and advice whenever you need.

• Q: Any other service?

  A: We can manufacture, design, install and commission various roll forming machines, including both standard and customized ones. Machine assembly and operator training are free of charge, but the buyer is responsible for the round-trip flight tickets and accommodation for our technicians.