Cage Loop in ERW Tube Mill

A Cage Loop is a material storage system used in an ERW tube mill line. Its main job is to temporarily store steel strip so that the production line can keep running continuously—even when changing coils.

Think of it as a buffer zone between processes. When the upstream section stops (like during coil change or welding), the cage loop feeds stored material to the forming section, preventing downtime.

Why is Cage Loop Important?

Without a cage loop, every coil change would require stopping the entire tube mill. This leads to:

• Production interruptions
• Lower efficiency
• More material waste

With a cage loop, you get:

✅ Continuous production
✅ Higher efficiency
✅ Reduced downtime
✅ Stable forming process

How Does a Cage Loop Work?

The steel strip enters the cage loop and is stored in a vertical spiral or “cage-like” structure.

• When upstream is running → strip is stored
• When upstream stops → stored strip is released
• Downstream forming section → keeps running without interruption

This ensures a smooth and stable material flow into the tube forming section.

Position in ERW Tube Mill Line

The cage loop is typically installed between:

👉 Slitting Line / Uncoiler & Shear-Welder
👉 Forming Section (Roll Forming Mill)

Process Flow Example:

Uncoiler → Shear & Welder → Cage Loop → Forming → Welding → Sizing → Cutting

Key Functions of Cage Loop

• Store strip material temporarily
• Synchronize speed between upstream and downstream
• Prevent line stoppage during coil change
• Improve overall production efficiency
• Protect strip from tension fluctuation

Technical Parameters (Typical Range)

(Parameters can be customized based on your project requirements.)

Cage Loop vs Horizontal Spiral Accumulator

Both systems are used for material storage, but they have different structures and applications.

How to Choose the Right Accumulator?

Choose Cage Loop if:

• You have limited workshop space
• Your material is medium or thick
• You want a cost-effective solution

Choose Horizontal Spiral Accumulator if:

• You run high-speed production
• Your material is thin strip
• You need larger storage capacity

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Q: Can cage loop handle stainless steel?
A: Yes, it can handle both carbon steel and stainless steel.

Q: Is it suitable for high-speed production?
A: Yes, but for very high-speed and thin strip, a horizontal accumulator may be better.

Q: Can it be customized?
A: Absolutely. We design based on your strip size, speed, and plant layout.

Q: Will the strip surface be scratched inside the cage loop?
A: No. A well-designed cage loop uses smooth guiding systems and controlled tension to protect the strip surface, even for stainless steel.

Q: Is automatic control necessary for a cage loop?
A: Yes. Automatic speed synchronization ensures stable strip flow between upstream and downstream, preventing tension issues and improving efficiency.