Conveyor technology - Specifications and selection of conveyor timing belts

Conveyor timing belts are a particularly efficient and versatile drive solution in conveyor technology. Unlike conventional conveyor belts or chain drives, they offer synchronized and therefore slip-free power transmission. They are indispensable in many applications. However, there are a few factors to consider when selecting.

Benefits of Conveyor Timing Belts

Compared to other conveying options, timing belts offer a number of advantages.

Precision and Synchronization

Unlike classic flat or V-belts, conveyor timing belts do not slip. Their surfaces have good damping properties and provide precise and synchronous movement between the drive and the output, making them particularly suited for conveying applications where timing and positioning are important.

Versatility

There are various applications for conveyor timing belts. They are used in logistics, for example, where they ensure a smooth flow of materials, but also in production lines in the automotive industry. In electrical production, antistatic belts according to ISO 284 protect sensitive components against damage.

Efficiency and low maintenance

The low friction loss of timing belts reduces the energy requirements of the drives and guarantees high efficiency. Their robust design and low maintenance requirements also help increase line availability, which is a key advantage, especially in high throughput production environments.

Specifications for Selection

There are a few factors to consider when selecting conveyor timing belts.

Material and surface properties

The material of the belt affects its load-bearing capacity, flexibility, and service life. Depending on the application, different materials are recommended:

• PU (polyurethane): High abrasion resistance, ideal for dry environments
• Neoprene: Temperature-resistant (-30°C to +100°C) and chemical-resistant
• Coatings (silicone, Teflon): Reduce friction and protect sensitive cargo

Antistatic properties according to ISO 284

Dissipation of static charges is essential in ATEX areas or for sensitive electronics. ISO 284 defines the requirements for antistatic belts:

• Maximum surface resistance: 300 MΩ
• Ensuring the discharge of electrostatic charges

Tolerances for flat belts

Precise tolerances are critical for smooth operation. Important reference values are:

• Width: ±0.5 mm to ±2 mm (depending on belt size)
• Thickness: ±0.3 mm to ±0.5 mm
• Length: ±1 mm per 1000 mm belt length

Timing belts and timing belt pulleys

When using timing belts, it is important to also select the appropriate timing belt pulleys to ensure precision and durability. The wrong combination of belts and pulleys leads to slippage, efficiency losses, faster wear, and possible system failures.

Timing belt maintenance

Timing belts are durable and require little maintenance. Nevertheless, it is also important here to pay attention to signs of wear.

These include:

• Belt cracks:

Cracks in the belt often indicate overload or material fatigue

• Belt misalignment:

If the belt is misaligned, several possible causes usually apply.
A 3 step check is recommended to rule these out.

1. Check the conveyor system for bending or twisting of the aluminum profile or housing.
2. Check the belt tension (the belt may be loose).
3. Check the pulley or the tensioning and guide pulley for foreign material.

• Belt wanders to one side:

In most cases, a bent aluminum profile or housing is the cause of the belt wandering. However, an excessively uneven distribution of the load can also cause the belt to wander.

• Abrasion on the tooth flanks:

Abrasion on the tooth flanks is often caused by misalignment.

• Unusual noises:

Unusual noises or vibrations are possible indicators of incorrect timing belt tension or damage to a component of the system. To avoid major damage, the damaged component should be replaced immediately and/or the tension of the timing belt should be corrected.

It is therefore important to carry out regular visual inspections for damage and wear, to clean to remove dirt and deposits, and to use sensors to continuously monitor tension and wear. Even in the absence of visible damage, timing belts should be replaced according to the manufacturer’s recommendations to avoid long-term damage.