Hydraulic Double Head Uncoiler for Tube Mill Production Line

Jun . 25, 2026 10:13

A Double Head Uncoiler is a coil feeding machine used at the beginning of an ERW tube mill production line. It is designed with two expanding mandrels, allowing one coil to be running while the next coil is prepared on the opposite side.

⚙️Compared with a single-head uncoiler, a double-head design significantly reduces coil change time and improves production efficiency. It is widely used in ERW tube mills, slitting lines, roll forming lines, and steel processing lines that require continuous production.

Position in an ERW Tube Mill

In a typical ERW tube mill process, the Double Head Uncoiler is installed at the entry section of the line:

📦 Steel Coil → Double Head Uncoiler → Shear & End Welder → Accumulator → Forming Section → HF Welding → Sizing Section → Cutting → Finished Pipe

The uncoiler continuously feeds steel strip into the tube mill, ensuring stable and smooth material supply for the downstream equipment.

Main Components

A standard Double Head Uncoiler usually consists of:

✅ Dual expanding mandrels

✅ Main drive system

✅ Coil loading support

✅ Hydraulic expansion system

✅ Rotation mechanism

✅ Electrical control system

✅ Safety protection devices

Working Principle

The steel coil is loaded onto one mandrel and expanded hydraulically or mechanically to secure the coil.

During production, the mandrel rotates and releases the steel strip at a controlled speed. Meanwhile, another coil can be loaded onto the second mandrel and prepared for the next production cycle.

When the running coil is nearly finished, the operator can quickly switch to the standby coil, minimizing downtime and improving line productivity.

Common Specifications

The actual specification depends on the tube mill capacity and coil requirements.

Item	Typical Range
Coil Width	200 – 1650 mm
Coil ID	450 – 610 mm
Coil OD	Up to 1800 mm
Coil Weight	3 – 10 Tons Per Side
Strip Thickness	0.5 – 8.0 mm
Expansion Type	Hydraulic
Rotation Type	Motor Driven

Custom designs are available according to customer requirements.

Advantages of Double Head Uncoiler

Higher Production Efficiency

Two mandrels allow quick coil replacement and reduce line stoppage.

Reduced Downtime

The next coil can be prepared while the current coil is running.

Stable Strip Feeding

Provides smooth and continuous material feeding to the ERW tube mill.

Labor Saving

Simplifies coil loading and changeover operations.

Suitable for High-Speed Production

Ideal for modern tube mills requiring continuous operation.

Uncoiler with peeler and hold down roll

How to Select a Suitable Double Head Uncoiler

When choosing a Double Head Uncoiler, the following parameters should be confirmed:

🔹 Coil width

🔹 Coil thickness

🔹 Coil weight

🔹 Coil inner diameter (ID)

🔹 Coil outer diameter (OD)

🔹 Tube mill production speed

🔹 Hydraulic or mechanical expansion requirement

Providing these parameters helps ensure the uncoiler matches the entire tube mill line.

FAQ

Q1: Why choose a double head uncoiler instead of a single head uncoiler❓

A double head uncoiler allows one coil to run while another coil is prepared, reducing coil change time and increasing production efficiency.

Q2: Is hydraulic expansion necessary❓

For larger and heavier coils, hydraulic expansion provides stronger clamping force and easier operation. Mechanical expansion is suitable for lighter-duty applications.

Q3: What coil weight can a double head uncoiler handle❓

Common capacities range from 3 tons to 10 tons per side, with larger capacities available upon request.

Q4: Can the uncoiler be customized❓

Yes. Coil width, coil weight, mandrel size, expansion type, and control system can all be customized according to the production line requirements.

Q5: Can it be integrated with an automatic shear and end welder❓

Yes. Double head uncoilers are commonly used together with shear & end welders and accumulators to achieve continuous tube production.

Double Head Uncoiler Manufacturer

AIS Machinery supplies reliable and customized Double Head Uncoilers for ERW Tube Mills, designed for stable strip feeding, fast coil changeover, and long service life. Our solutions can be tailored according to coil specifications, production capacity, and plant layout requirements.

📞Contact AIS Machinery for professional technical support and customized tube mill solutions.

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