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Cage Loop vs Horizontal Spiral Accumulator: How to Choose the Right Accumulator for Your ERW Tube Mill

Mar . 23, 2026 00:00

In an ERW tube mill, an accumulator—also known as a loop system—is a key machine that stores steel strip temporarily to ensure continuous production.

During tube production, coils must be joined together. However, the welding process requires the mill to stop briefly. Without an accumulator, the entire line would have to stop, reducing efficiency.

👉 This is where the accumulator comes in:

It stores strip material in advance
Releases strip continuously during coil change
Keeps the tube mill running without interruption

Where Is the Accumulator Located in the Tube Mill Line?

The accumulator is typically installed between the slitting/uncoiling section and the forming section.

Typical Position in Production Line:

Uncoiler → Shear & Welder → Accumulator (Loop System) → Forming → Welding → Sizing → Cutting

👉 In simple terms:
It acts as a “buffer zone” before the forming mill.

Types of Accumulators: Cage Loop vs Horizontal Spiral Accumulator

There are two commonly used accumulator types in tube mills:

1. Cage Loop (Vertical Accumulator)⭐

What it is:
A cage loop accumulator stores strip in a vertical cage-like structure.

Key Features:

Strip moves up and down inside a cage
Compact footprint
Suitable for medium speeds

Advantages:
✔ Space-saving design
✔ Lower initial investment
✔ Simple structure, easy maintenance

Disadvantages:
✘ Limited storage capacity
✘ Not ideal for very high-speed mills
✘ Strip stability can be slightly lower at high speeds

2. Horizontal Spiral Accumulator💡

What it is:
This type stores strip in a horizontal spiral (coil-like) form.

Key Features:

Large strip storage capacity
Smooth strip flow
Designed for high-speed production

Advantages:
✔ Large storage capacity
✔ Ideal for high-speed ERW tube mills
✔ Better strip stability and less tension fluctuation

Disadvantages:
✘ Requires more floor space
✘ Higher investment cost
✘ More complex structure

Cage Loop vs Horizontal Spiral Accumulator: Key Differences

Feature	Cage Loop	Horizontal Spiral Accumulator
Structure	Vertical cage	Horizontal spiral
Space Required	Compact	Larger
Storage Capacity	Medium	Large
Suitable Speed	Medium	High-speed
Cost	Lower	Higher
Stability	Moderate	Excellent

How to Choose the Right Accumulator?

Choosing the right accumulator depends on your production requirements:

📌 Choose Cage Loop if:

Your mill speed is medium
Workshop space is limited
Budget is tight
Production demand is not extremely high

📌 Choose Horizontal Spiral Accumulator if:

Your mill runs at high speed
You need continuous and stable production
You process large volumes
You want higher automation and efficiency

💡 Pro Tip:
For modern high-speed ERW tube mills, the horizontal spiral accumulator is becoming the preferred choice.

Frequently Asked Questions (FAQ)

1. Why is an accumulator necessary in an ERW tube mill?

It allows continuous production by storing strip while coils are being welded, preventing downtime.

2. Can I run a tube mill without an accumulator?

Technically yes, but production efficiency will be very low due to frequent stops.

3. Which accumulator is better for high-speed production?

The horizontal spiral accumulator is the best choice due to its large storage capacity and stable strip feeding.

4. Is a cage loop accumulator outdated?

No. It is still widely used for small to medium tube mills due to its cost-effectiveness.

5. What factors affect accumulator selection?

Tube mill speed
Strip thickness and width
Available workshop space
Budget
Production capacity

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