General Introduction:
General rubber conveyor belts can transport materials below 80°C, such as coal, ores, sand, gravel, and grains. However, certain specialized industries handle materials at extremely high temperatures, such as clinker, cement products, dry clay in cement plants, sintered ore, coke, pellets, slag in Steel mill, as well as materials in Foundries and Taconite industries. The temperatures in these industries often range from 200 to 500 degrees Celsius, and sometimes even exceed 800 degrees Celsius.
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Temperature range and belt surface temperature of high-temperature materials (for reference only)
But natural rubber cannot withstand such high temperatures, and the severe wear, shock, and tension further accelerate the aging process of conveyor belts, causing rubber hardening and cracking. Therefore, when manufacturing conveyor belts for handling high-temperature materials, it is necessary to incorporate appropriate chemical formulations to create heat-resistant conveyor belts. In the chemical industry, DIN classifies heat-resistant conveyor belts into three grades: T1, T2, and T3, corresponding to test temperatures of 120, 150, and 180 degrees Celsius, respectively.
The heat resistant conveyor belt is made up of high temperature burning layer, transition layer, the organic insulation layer, a strong heat-resistant layer. The rubber surface uses EPDM(Ethylene Propylene Diene Monomer) or SBR (Polymerized Styrene-Butadiene Rubber) to make rubber cover respectively; the polyester canvas or canvas with high strength and high permeability can make the strong layer. These will be bonded together through high-temperature vulcanization.
The chemical principles of heat resistant rubber:
The heat resistant cover produces porous carbonized stratum as a conveyor belt carrying high-temperature material, this carbonized stratum has burning resistant function, and prevent the high temperature from transferring further into the belt center body, so that can protect the internal strength of the heat resistant conveyor belt. Furthermore, the carbonized stratum generates irregular tiny crack during the conveyor belt's running, which can have a cooling effect for the conveyor belt itself.
Application:
Used in cement plant, steel and iron factory, metallurgy, coking industry. Mainly for conveying coke iron and steel castings cement clinker and high-temperature materials feature: Product selects cotton canvas or EP canvas as skeleton material. Cover rubber and cushion rubber is styrene-butadiene rubber or chlorobutadiene that has good heat-resistant work, and it is suitable for carrying materials under the temperature of 150'.
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The guide for choosing heat resistant conveyor belt cover type:
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Conveyor belts play a crucial role in various industries, efficiently transporting materials across distances. But what happens when those materials are scorching hot? Enter the realm of heat resistant conveyor belts, specially designed to handle high temperatures without melting, losing strength, or compromising safety.
What is a Heat Resistant Conveyor Belt?
A heat-resistant conveyor belt is a specialized type of conveyor belt designed to withstand high temperatures and extreme heat environments. Typically constructed from materials like rubber, silicone, or synthetic fibers, these belts are engineered to maintain their structural integrity and functionality even when exposed to temperatures ranging from 150°C to over 300°C.
Heat resistant c are commonly used in industries such as steel manufacturing, foundries, glass production, and certain types of chemical processing where conveying materials at elevated temperatures is essential. Their robust construction and resistance to heat make them vital components in ensuring smooth and reliable material handling operations in demanding industrial settings.
Construction of Heat Resistant Conveyor Belts
- Special Rubber Compounds: The covers (top and bottom layers) are formulated with heat-resistant polymers like EPDM and chlorobutyl rubber. These materials maintain their elasticity and strength at elevated temperatures, preventing belt degradation and ensuring smooth operation.
- Reinforced Carcass: The core of the belt, often made of polyester fabric, is chosen for its high tensile strength and low thermal shrinkage. This ensures dimensional stability even under intense heat.
- Multi-layered Design: Some belts incorporate additional layers, like insulation layers and porous carbonized strata, to further impede heat transfer and protect the internal structure.
How Do Heat Resistant Conveyor Belts Work?
The basic principle remains the same as any conveyor belt: a continuous loop powered by a motor transports materials along its surface. However, heat-resistant belts require extra considerations:
- Temperature Limits: Each belt is rated for a specific maximum temperature, typically ranging from 100°C to 500°C depending on the materials and construction. Exceeding these limits can damage the belt and pose safety risks.
- Cooling Systems: In extreme environments, additional cooling mechanisms like air knives or water sprays might be employed to dissipate heat and protect the belt.
- Maintenance: Regular inspections and proper maintenance are crucial to ensure the belt's integrity and prevent unexpected failures.
What are the main Benefits of Heat Resistant Conveyor Belts?
- Durability: They are made from special rubber compounds that resist high temperatures, extending their lifespan and reducing maintenance costs.
- Improved safety: Unlike standard belts that can melt or deform, heat-resistant belts maintain their integrity, minimizing safety risks.
- A wider range of applications: They enable the handling of hot materials in industries like cement production, glass manufacturing, asphalt production, steel industry, and food processing.
- Reduced downtime: They can operate continuously in high-temperature environments, minimizing downtime for maintenance or repairs.
- Energy efficiency: Some belts are designed to reflect heat, reducing energy consumption in conveyor systems.
Applications across Industries:
Heat resistant conveyor belts find their niche in various sectors:
- Cement Industry: Transporting clinker, hot meals, and finished products.
- Steel Industry: Conveying coke, slag, and molten metal byproducts.
- Power Generation: Handling fly ash and other hot materials in coal-fired plants.
- Asphalt Industry: Moving hot asphalt mixes for road construction.
- Chemical Industry: Conveying hot chemicals and resins in various processes.
Conclusion: