What Is a Double Plus Chain Conveyor?

A double plus chain conveyor is a specialized conveying system designed for high-speed transport with accumulation capability. It uses a unique chain structure where rollers mounted on the chain move faster than the chain itself, allowing products to travel at a higher speed while the chain runs at a lower speed.

This “speed multiplication” effect is why it’s called double plus.

In simple terms:

• The chain moves → drives rollers
• The rollers spin faster → carry products forward
• Products can accumulate without stopping the chain

This makes it ideal for buffering, assembly lines, and automated production systems.

The above is a double-speed chain with double training.This kind of conveyor is widely used in automated conveyor system.

Double Plus Chain vs. Standard Chain Conveyor

The key difference is not just structure—it’s how they behave in real production.

Bottom line:

• Use standard chain for heavy, rough transport
• Use double plus chain for precision, accumulation, and efficiency

This is the chain of double plus chain conveyor.If you want to learn more about the difference,pls check here: Traditional Chain Conveyor VS Double Plus Chain Conveyor

Key Components of a Double Plus Chain Conveyor

A well-designed system typically includes:

1. Double Plus Chain

• Core transmission element
• Includes built-in rollers that rotate independently
• Made of alloy steel or engineering plastic (depending on load)

2. Aluminum or Steel Frame

• Modular structure
• Lightweight (aluminum) or heavy-duty (steel)

3. Guide Rails

• Keep products aligned
• Adjustable for different product sizes

4. Drive Unit

• Motor + gearbox
• Controls conveyor speed and torque

5. Support Legs

• Height-adjustable
• Ensures stability

6. Transfer Modules (Optional)

• Stops, lifts, turntables
• Enable system automation

Working Principle

The system works on a clever mechanical principle:

1. The motor drives the chain at a constant speed
2. Rollers mounted on the chain rotate due to friction
3. Roller surface speed becomes 2–3 times faster than chain speed
4. Products sit on rollers and move faster than the chain
5. When blocked, rollers keep spinning → products stop without pressure buildup

Result: Smooth conveying + zero back pressure accumulation

Main Applications

Double plus chain conveyors are widely used in industries where controlled movement and buffering are critical:

1. Electronics Manufacturing

• PCB assembly lines
• Device assembly (phones, laptops)

2. Home Appliance Production

• Washing machines
• Refrigerators
• Air conditioners

3. Automotive Parts Assembly

• Component sub-assembly
• Lightweight part transfer

4. Packaging Lines

• Carton handling
• Sorting and buffering

5. E-commerce & Logistics

• Order consolidation zones
• Temporary storage before sorting

This is a double plus chain conveyor used in the automotive parts assembly system.

What Problems Does It Solve?

1. Product Collision & Damage

Traditional conveyors push products into each other.
Double plus chain allows accumulation without contact.

2. Line Blocking & Downtime

If one station stops, the whole line stops.
This system creates buffers, keeping upstream running.

3. Excessive Wear & Maintenance

Direct chain contact causes friction and wear.
Roller-based transport reduces friction significantly.

4. Noise Issues

Factories often struggle with noise compliance.
Roller movement is quieter than sliding chain contact.

5. Inefficient Space Usage

No buffering = wasted line length.
Accumulation allows compact, efficient layouts.

Standard vs. Custom (Non-Standard) Double Plus Chain Conveyor

Choosing between standard and custom is a critical decision.

Standard Systems

Advantages:

• Lower cost
• Short delivery time
• Proven design

Limitations:

• Fixed dimensions
• Limited flexibility
• Not optimized for unique products

Custom (Non-Standard) Systems

Advantages:

• Designed for your product size, weight, and process
• Can integrate with robots, lifts, and inspection systems
• Optimized layout → higher efficiency
• Better ROI in complex production lines

Limitations:

• Higher initial cost
• Longer design and manufacturing cycle

Comparison Summary

Practical advice:

• Choose standard for simple transport
• Choose custom for automation lines and long-term efficiency

If your need to integrate industrial robots or other automatic assembly equipment onto the production line, custom conveyor lines are necessary.

This is a conveyor system integrated robot and double plus chain conveyor.

Competitive Analysis

Compared to other conveyor types:

vs. Roller Conveyor

• ✔ Better accumulation control
• ✔ More stable for controlled movement
• ✖ Slightly more complex

vs. Belt Conveyor

• ✔ No slipping
• ✔ Better for precise positioning
• ✖ Not ideal for very small or soft items

vs. Standard Chain Conveyor

• ✔ Less wear
• ✔ Accumulation capability
• ✔ Lower noise

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Final Thoughts

A double plus chain conveyor is not just a transport system—it’s a flow control tool. It improves productivity by allowing products to move independently of the chain speed, enabling buffering, reducing collisions, and supporting automation.

For simple lines, standard systems work.
For competitive, high-efficiency manufacturing, custom double plus chain solutions deliver far more value over time.