Automatic 3 t Hydraulic Decoiler for Metal Roofing Sheet Roll Forming Machine

The automatic hydraulic decoiler is engineered to support metal roll forming machines by efficiently uncoiling and feeding steel coils. This system is composed of a sturdy frame, precision spindle, expansion mandrel, and a reliable braking mechanism, working together to maintain proper coil tension throughout the production process.

a) Main Frame
The frame is constructed from forged and welded steel components, using section steel, A3 steel plates, and #45 steel. It undergoes annealing and quality treatment to ensure structural stability and prevent deformation. Dual bearing housings are precisely bored in one operation to guarantee spindle alignment and avoid radial deviation.

b) Spindle
Fabricated from 40Gr alloy steel, the spindle features an 85mm diameter through-hole. After undergoing quenching and tempering, it is finely machined. The working diameter is 190mm.

c) Expansion Mandrel
The mandrel employs a slider-style expansion system with four arc plates and paired linear guide blocks, offering an adjustable diameter range from Ø460mm to Ø520mm. Its effective working length is 1300mm. For added durability, the drum surface is finished with hard chrome plating.

d) Braking System
The decoiler uses a pneumatic disc brake system with adjustable force. The brake engages automatically during idle or stop conditions to prevent the coil from loosening or damaging the material. When running, it releases automatically for smooth operation.

e) Hydraulic Actuation
The hydraulic system powers both the mandrel expansion and the lifting mechanism. Key cylinder specifications include FA-Ø125×130mm for expansion and FA-Ø63×600mm for pressure lifting, utilizing rotary joints for oil supply.

Types of Hydraulic Decoilers

The automatic hydraulic decoiler can be configured to suit different machines and functions:

1. Short-shaft decoiler – for purline forming lines.

2. Long-shaft version – ideal for wide-width coil sheet forming machines.

3. Decoilers for slitting and cut-to-length lines.

4. Roofing sheet decoilers – fixed or mobile.

Optional configurations include:

• Fixed or rail-mounted movable decoilers

• Fixed or X-table style loading cars

• Decoilers with pressing arms for anti-loosening

• Support table under decoiler for heavy coil assistance

• Pneumatic braking-equipped models

Advantages of Zhongtuo Hydraulic Decoiler

1. Premium Electrical Components
   All electrical parts are sourced from reputable brands like Schneider, enhancing operational safety, stability, and longevity.

2. Efficient Pneumatic Brake System
   The pneumatic braking mechanism ensures immediate stopping of the coil rotation, essential for high-speed forming lines. This setup provides stronger braking force and prevents excessive coil feed. Note: A compressed air source is required on-site.

3. Robust Expanding Mechanism
   The four-arm mandrel with sliding blocks applies strong and uniform force to fix coils securely, minimizing inner coil deformation. Blocks are adjustable to fit coils with larger inner diameters.