Sep. 01, 2025
Conveyor belts serve as the primary tools for transporting coal in underground mines. Currently, the conveyor belts used in underground coal mines are primarily flame-resistant and anti-static. Two main types of these belts exist: fabric core flame-resistant conveyor belts and steel cord flame-resistant conveyor belts.
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Advantages: Flame-resistant, anti-static, waterproof, tear-resistant, thin belt body, lightweight, low energy consumption, relatively simple production process.
Disadvantages: Substantial elongation, shorter lifespan (typically not exceeding 4 years), limited cumulative coal transportation (not exceeding 5 million tons).
Advantages: Flame-resistant, anti-static, high tensile strength, excellent impact resistance, minimal elongation, good troughing performance, excellent resistance to bending fatigue, long lifespan (generally 5 to 10 years).
Disadvantages: Thick belt body, higher weight, higher tear resistance, higher energy consumption during transportation, complex production process.
In a coal mining area with a downhill transportation requirement, where the throughput (Q) is t/h, horizontal distance (L) is m, and vertical lift (H) is 40m, selecting the appropriate conveyor belt is crucial. Despite fabric core belts being lighter under the same tensile strength conditions, considering safety factors, the steel cord conveyor belt is often the preferred choice. This preference arises from the fact that fabric core belts require a higher safety factor, leading to a need for a larger belt strength under the same material lifting conditions.
The tensioning of conveyor belts should be determined based on factors like the length of the conveyor, start and stop methods, and belt characteristics. The calculation for tensioning travel (Lsp) is given by the formula: Lsp ≥ (ε0 + ε1) L + LN.
Fabric Core Flame-Resistant Conveyor Belt: Lsp ≥ (ε0 + ε1) L + LN = (0.015 + 0.001) × + 2 = 34.4m
Steel Cord Flame-Resistant Conveyor Belt: Lsp ≥ (ε0 + ε1) L + LN = (0. + 0.001) × + 1.55 = 8.6m
For underground belt conveyors, the steel cord belt allows for straightforward tensioning, while the fabric core belt requires a hydraulic cylinder + winch tensioning method due to its longer tensioning travel.
Both fabric core and steel cord flame-resistant conveyor belts are suitable for underground belt conveyors in coal mines.
For short distances and lower throughputs, fabric core belts may be preferred. However, for longer distances and higher throughputs, a careful calculation is necessary. When the difference in belt weight is not significant, the steel cord belt is often the better choice, offering a lifespan approximately 3 to 5 times longer than that of fabric core belts.
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Different tensioning methods are required for fabric core and steel cord belts due to their varying elongation coefficients. The choice of conveyor belt and tensioning method should be carefully considered based on specific mining conditions and requirements.
The polyester (EP) rubber conveyor belt is widely used in the bulk material industry. The structure of the polyester rubber belt is comprehensively processed by a multi-layer polyester, that is, EP (or polyester in the warp direction and polyesteramine in the weft direction) according to scientific methods. It is scientifically developed with high-strength and high-strength wear-resistant rubber. So what are the characteristics of this polyester rubber conveyor belt?
1. EP conveyor belt has many characteristics such as good elasticity, impact resistance and tear resistance, which can meet the requirements of various complex environments;
2. The EP conveyor belt has a small fixed load elongation. The use of a small elongation polyester canvas conveyor belt has a fixed load elongation performance that is better than other common specifications of fabric core conveyor belts. It can greatly reduce the running stroke during use and is effective. To reduce the overall equipment cost is extremely advantageous for long-distance material transportation.
3. The EP conveyor belt has stronger water resistance. When it is used in a humid and cold environment, the adhesion of the rubber’s comprehensive strength will not be affected in any way, it will still work normally, and it will last longer in the service life;
4. The acid resistance, alkali resistance and heat resistance of EP conveyor belts are excellent. From a long-term perspective, it is more economical to choose ep conveyor belts;
5. The EP conveyor belt has few layers, thin belt body, light weight, strong plasticity during use, etc. It not only improves the conveying capacity but also reduces the power consumption rate of the equipment, and optimizes the transportation radius. Requirements for reducing energy and increasing efficiency;
6. The tensile strength of the cover layer of the EP conveyor belt is higher than 15 MPa, the load elongation is higher than 450 %, and the friction loss is lower than 150mm3;
7. The adhesive strength between the EP strong cloth layers The average value of the longitudinal sample between the cloth layers is greater than or equal to 4.5 N /mm, and the adhesion rate between the covered rubber surface and the cloth layer is greater than 4 N /mm;
8. The overall longitudinal thickness tear change rate of the EP conveyor belt and the full thickness longitudinal reference force elongation have reached international standards.
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