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SR620
RONWIN
The accumulation roller (mechanical friction type) conveyor, also known as a friction-type roller accumulation conveyor, is a conveying device that uses single‑sprocket or double‑sprocket accumulation rollers and standard chain drives. As a type of roller conveyor, its core feature is that it allows goods to stop and accumulate on the conveying line while the drive unit continues to run, without a noticeable increase in running resistance.
The equipment mainly consists of a drive motor, roller chains, precision accumulation rollers, and a conveyor frame. The precision accumulation rollers are mounted on the conveyor frame by screws, resulting in a compact overall structure.
The core working principle of the accumulation roller conveyor is friction slipping.
Specifically, the drive motor transmits power to the accumulation rollers through roller chains and drive sprockets. Inside each accumulation roller, there is a sprocket, a compression spring, and friction plates. The sprocket presses the friction plates via the compression spring to transmit torque, thereby rotating the roller tube.
Under normal operation, the sprocket drives the roller tube to rotate through the friction plates, moving the goods forward on top. When the goods are stopped by a stopping mechanism on the line, the roller tube is forced to stop rotating, but the sprocket continues to rotate driven by the chain. At this point, relative sliding occurs between the sprocket and the friction plates – the so‑called "slipping" phenomenon: the sprocket keeps turning with the chain, while the tube remains stationary. This friction slipping mechanism is the key to achieving the "accumulation" function.
In addition, adjustable accumulation rollers allow the spring pressure to be changed via a nut at the tail end, thereby controlling the friction force between the sprocket and the friction plates. When the friction resistance is greater than the rolling friction of the conveyed goods, the roller conveys normally; when the goods are blocked, sliding occurs at the friction plates, achieving accumulation.
The friction structure of accumulation rollers mainly includes axial friction and radial friction types. Among them, axial friction – which uses a spring to press friction plates for torque transmission – is more common and generally offers a longer service life.
The accumulation roller conveyor offers the following notable advantages.
Accumulation capability – allows goods to stop and accumulate at designated positions without stopping the drive, enabling temporary storage and queuing.
Smooth operation – high machining precision results in low radial run‑out and stable conveying.
Low energy consumption – daily operation requires relatively little energy.
Low noise – operating noise is low.
Easy maintenance – routine maintenance workload is small.
Compact structure – the entire machine is space‑saving.
Gentle on materials – does not damage machined surfaces when conveying precision components.
High flexibility – easy to interface between roller lines and can be combined with other conveying equipment to form complex logistics systems.
Common technical specifications for accumulation roller conveyors are as follows:
| Parameter | Common Range |
|---|---|
| Drive type | Single‑chain / Double‑chain drive |
| Roller diameter | Φ50, Φ60, Φ76 |
| Roller pitch | Standard 75mm / 100mm / 150mm (customizable) |
| Conveying speed | ≤20m/min ~ 25m/min (max. up to 30m/min) |
| Conveying length | Approx. 15m max. |
| Load capacity | ≤120kg/roller |
| Chain pitch | 12.7mm, 76.2mm, etc. |
| Roller material | Galvanised steel, stainless steel |
| Operating temperature | -5℃ ~ +40℃ (standard); -10℃ ~ +80℃ (special types) |
Based on the product construction, accumulation rollers are mainly divided into sleeve-type accumulation rollers and adjustable accumulation rollers. The sleeve-type further includes polymer sprocket accumulation rollers** and steel sprocket accumulation rollers. A detailed analysis is given below.
Structural features: Uses high‑performance polyamide (commonly known as plastic steel) for the sprocket material; precision ball bearings are combined with polyamide bearing assembly.
Advantages:
- Low operating noise – significantly quieter than traditional steel sprockets
- Self‑lubricating and wear‑resistant plastic‑steel sprocket and accumulation sleeve
- Plastic end caps at the roller ends protect bearings from dust and splashing water
- Lightweight and smooth running
- Same external dimensions as steel series, allowing easy interchange
Disadvantages:
- Typical sleeve‑type friction accumulation, where accumulation force is coupled with the load, resulting in limited accumulation capacity
- Cannot handle heavy‑duty accumulation – suitable only for light to medium loads
- Limited load capacity – typically recommended for goods weighing 2~20kg
- Narrower temperature range: -5℃~+40℃
Typical applications: Light‑medium carton conveying, pharmaceutical warehousing and logistics, e‑commerce logistics, convenience store storage and picking, etc.
Structural features: Uses steel sprockets as the drive element; precision bearings are fixed inside with polyamide bearing housing.
Advantages:
- Steel sprocket is more durable.
- Smooth rotation
- End caps fitted on the outside of steel sprockets effectively prevent dust and water ingress
- Robust construction, capable of withstanding greater loads than plastic bearing housings
Disadvantages:
- Higher operating noise compared to plastic‑steel sprockets
- Still a sleeve‑type friction accumulation design with limited accumulation force
- Cannot meet heavy‑duty accumulation requirements
- Typically suitable for goods weighing 2~20kg
Structural features: Uses steel sprockets with special friction plates inside; precision ball bearings are fixed into steel bearing housings by staking.
Advantages:
- Adjustable accumulation force – precise adjustment via a nut at the tail end, offering high flexibility
- High load capacity– meets medium to heavy accumulation demands, far beyond sleeve‑type designs
- Excellent wear resistance – the special friction plate material greatly enhances durability and service life
- Smooth and precise conveying
- Robust steel bearing components withstand higher axial forces and loads than injection‑moulded bearing housings
- Lock nut at the tail end prevents loosening and consequent loss of accumulation force during use
- Bearings on the sprocket side are detachable for easier maintenance and replacement
- Wider operating temperature range: -10℃~+80℃
- Typically suitable for goods weighing 0~120kg
Disadvantages:
- Relatively more complex structure and higher cost
- Adjustment requires some operational experience
| Aspect | Plastic‑Steel Sprocket | Steel Sprocket | Friction‑plate Adjustable Steel Sprocket |
|---|---|---|---|
| Sprocket material | Polyamide (plastic steel) | Steel | Steel |
| Accumulation type | Sleeve‑type friction | Sleeve‑type friction | Friction‑plate type (adjustable) |
| Accumulation force adjustment | Not adjustable (load‑dependent) | Not adjustable (load‑dependent) | Adjustable (tail‑end nut) |
| Load capacity | Light (2~20kg) | Light‑medium (2~20kg) | Medium‑heavy (0~120kg) |
| Noise level | Low | Moderate | Moderate |
| Wear resistance | Good | Good | Excellent (special friction plates) |
| Operating temperature | -5℃~+40℃ | -5℃~+40℃ | -10℃~+80℃ |
| Maintenance convenience | Fair | Fair | Good (detachable design) |
| Cost | Low | Medium | Higher |
Accumulation roller conveyors are widely used in material handling and assembly operations across various industries:
Major industries:
- Automotive and parts – assembly lines for automobiles, motorcycles, engines, etc.
- Home appliances – assembly, testing, and inspection of TVs, monitors, air conditioners, gas appliances, etc.
- Electronics – conveying precision products such as instruments and meters
- Warehousing and logistics – e‑commerce fulfillment, automated warehouses, distribution centres
- Tobacco industry – finished product warehousing in automated logistics systems
- Construction machinery – accumulation conveying of heavy components
Suitable material types:
- Various boxes, bags, pallets, and other unit loads
- Cartons, totes, and other items with flat bottoms
- Bulk or small items must be placed on pallets or in totes for conveying
Typical application cases:
- Assembly line operations with manual workstations
- Conveying sections requiring temporary accumulation and queuing
- Flexible production lines with multiple product types and workstations
- Assembly lines where non‑synchronous conveying is required
Choose the appropriate accumulation roller type based on actual operating conditions:
Light loads with strict noise requirements (e.g., pharmaceutical warehousing, e‑commerce sorting) – plastic‑steel sprocket accumulation rollers are recommended.
Medium loads in conventional environments –*steel sprocket accumulation rollers may be selected.
Medium‑heavy loads requiring precise accumulation force control (e.g., automotive parts, construction machinery assembly) – **friction‑plate steel sprocket adjustable accumulation rollers** are recommended.
Wet environments or wash‑down applications – plastic‑steel sprockets and stainless steel rollers are more suitable.
High or low temperature conditions (outside -5℃~+40℃) – choose adjustable accumulation rollers with a wider temperature range.
With its unique accumulation capability, smooth running performance, and flexible configuration, the accumulation roller conveyor has become an indispensable piece of equipment in modern automated logistics and production assembly lines.
