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

Jul . 07, 2026 10:20

In an ERW tube mill, continuous production is essential for stable welding quality and high productivity. During coil changing and strip end welding, the forming section cannot stop immediately. This is where an accumulator plays a critical role.

An accumulator temporarily stores steel strip, allowing the tube mill to continue running while a new coil is prepared and welded. Without an accumulator, every coil change would require stopping the entire production line, reducing efficiency and increasing production costs.

Today, the most common accumulator types are:

🔹 Horizontal Spiral Accumulator
🔹 Vertical Type Accumulator
🔹 Cage Loop (Cage Accumulator)

Each design serves the same basic purpose but is suitable for different production requirements.

What Is an Accumulator? 📦

An accumulator is a strip storage device installed between the shear & welder and the forming section of an ERW tube mill.

Its main functions include:

✅ Store sufficient strip during coil changing

✅ Maintain continuous feeding into the forming mill

✅ Prevent production interruption

✅ Improve welding stability

✅ Increase overall production efficiency

Simply put, the accumulator acts as a buffer between the entry section and the tube forming section.

Horizontal Spiral Accumulator 🌀

How It Works

The strip enters the accumulator through guide rolls and is stored in multiple horizontal spiral loops. During coil changing and strip end welding, the stored strip is continuously released to keep the tube mill running without interruption.

Features

✅ Large strip storage capacity

✅ Suitable for medium and high-speed tube mills

✅ Stable strip feeding

✅ Mature and widely used design

✅ Higher investment but excellent production efficiency

Typical Applications

Medium and large ERW tube mills
High-speed production lines
Continuous production with frequent coil changes

Vertical Type Accumulator ⬆️

How It Works

The strip is stored in vertical loops inside a tower structure. Storage capacity is achieved by utilizing the building height instead of occupying additional floor space.

Features

✅ Saves valuable floor space

✅ Large strip storage capacity

✅ Suitable for factories with sufficient ceiling height

✅ Reliable continuous strip supply

Typical Applications

Plants with limited workshop width
Medium and large tube mills
Production lines requiring long strip storage

Cage Loop Accumulator 🏗️

How It Works

The strip passes through a series of guide rollers and forms controlled loops inside the cage. The stored strip is then released continuously while the entry section performs coil changing.

Features

✅ Simple and compact structure

✅ Lower manufacturing and maintenance cost

✅ Suitable for low and medium production speeds

✅ Smaller strip storage capacity than spiral or vertical accumulators

Typical Applications

Small and medium tube mills
Lower-speed production lines
Projects with limited equipment budgets

Comparison of Three Types 📊

Item	Horizontal Spiral	Vertical Type	Cage Loop
Strip Storage Capacity	⭐⭐⭐⭐⭐ Large	⭐⭐⭐⭐ Large	⭐⭐ Small
Production Speed	High	Medium to High	Low to Medium
Floor Space	Large	Small	Small
Height Requirement	Low	High	Low
Structure	More Complex	Moderate	Simple
Investment Cost	High	Medium to High	Low
Typical Application	Medium & Large Tube Mills	Height-Limited Layouts	Small Tube Mills

How to Choose the Right Accumulator?📌

Choose a Horizontal Spiral Accumulator if:

✔ Your production line runs at medium or high speed.

✔ You require maximum strip storage capacity.

✔ Continuous production efficiency is your priority.

✔ You have enough workshop floor space.

Choose a Vertical Accumulator if:

✔ Your workshop floor space is limited.

✔ The building has sufficient height.

✔ You still need a relatively large strip storage capacity.

Choose a Cage Loop if:

✔ Your production speed is relatively low.

✔ Coil changing is less frequent.

✔ Equipment budget is an important consideration.

✔ A simple and economical solution meets your production requirements.

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