Heavy-duty uncoilers are vertical feeding and uncoiling devices commonly used in stamping and shearing production lines. Their basic operating principle involves using an expanding and contracting reel to tension the material coil for feeding. A motor drives the expanding and contracting reel via a reducer and pulley to achieve uncoiling. However, many stamping clients are unaware that the main structure of heavy-duty uncoilers (such as the reel, braking device, uncoiler centering adjustment, etc.) can differ significantly based on the material’s width, thickness, load capacity, and other coil properties. These can be custom-made, with various structures available for actual selection. Here is a detailed explanation of the structural options for purchasing such equipment.

I. Types and Selection of Expanding and Contracting Reels for Heavy-Duty Uncoilers

The expanding and contracting reel of a heavy-duty uncoiler functions to support and place the material coil. There are four structural forms: bow plate type, parallel four-link type, four-prism type, and four-wedge type. The parallel four-link type and the four-prism type are the most commonly used main structures in heavy-duty uncoilers.

  1. Parallel Four-Link Type Reel Structure This is a common structure for standard heavy-duty uncoilers. It consists of four arc-shaped supporting plates with similar structural dimensions. Each arc-shaped plate is connected to a supporting sleeve on the shaft via four short links, forming a parallel four-link mechanism. The reel diameter expands or contracts based on the change in the inclination angle of the short links.
  2. Four-Prism Type Reel Structure This structure is mainly used in hydraulic heavy-duty uncoilers. The reel consists of four fan-shaped supporting plates. The inner side of the fan-shaped plates has stepped inclined surfaces that match the stepped inclined surfaces of a central four-prism core. The outer diameter expands or contracts through a slight axial sliding of the four-prism core.

II. Types and Selection of Braking Devices for Heavy-Duty Uncoilers

The braking device in a heavy-duty uncoiler is used to eliminate the inertia during uncoiler operation. There are three structural forms: mechanical band brake, magnetic powder brake, and DC drive.

  1. Mechanical Band Brake Device This is the most commonly used braking structure in standard heavy-duty uncoilers. It is characterized by its simple structure and affordable price. However, it has a downside in that tension control is not easy, making it suitable only for small to medium-sized heavy-duty uncoilers.
  2. Magnetic Powder Brake Device This braking structure is commonly used in medium-sized heavy-duty uncoilers. It forms uncoiling tension through a magnetic powder brake. By adjusting the excitation current regulation system, the tension can be altered, facilitating automatic control. However, the maximum tension that can be generated is limited by the torque capacity of the magnetic powder brake, making it unsuitable for large heavy-duty uncoilers.
  3. DC Drive Braking Device This method is used in heavy-duty uncoilers for medium to large coil stamping and shearing production lines, forming the required uncoiling tension.

III. Types and Selection of Uncoiler Centering Adjustment

For most stamping and shearing production lines, it is essential for the uncoiler to have centering adjustment capability. This ensures that the material centerline always aligns with the production line centerline during loading and operation, ensuring the stability of the entire production line.

The centering adjustment systems for heavy-duty uncoilers primarily include photoelectric hydraulic centering adjustment systems and pneumatic hydraulic centering adjustment systems. However, the photoelectric hydraulic centering adjustment system is considered more reliable and stable.

  1. Photoelectric Hydraulic Centering Adjustment System In this system, a photoelectric sensor switch is fixed at the edge of the strip, keeping the strip aligned with the centerline of the light source. If the strip deviates, the change in the electrical signal is fed back to the hydraulic centering cylinder, which then adjusts the uncoiler, achieving automatic centering.
Heavy-Duty Uncoiler
Heavy-Duty Uncoiler