Key Considerations for Selecting a En Masse Conveyor (Buried Scraper Conveyor)

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When it comes to choosing the right buried scraper conveyor for your industrial needs, several crucial factors must be taken into account. This blog post will guide you through the key considerations to ensure you make an informed decision.
Material Characteristics
1. Density: The bulk density of the material is a fundamental aspect. Generally, buried scraper conveyors can handle materials with a loose density ranging from 0.2 to 2.5 t/m³. For materials with higher densities, special considerations might be needed, such as preventing the "floating chain" phenomenon. This could involve shortening the length of a single unit or choosing a larger model.

2. Particle Size: The particle size of the material matters significantly. For fragile materials during horizontal transportation, the suitable particle size is about 1/20 of the width of the machine trough (B), and the maximum particle size should not exceed 1/10 of B. During vertical transportation, the appropriate size is 1/30 of B, with the maximum not exceeding 1/15 of B. For non - fragile materials, the corresponding ratios are 1/40 and 1/20 for horizontal, and 1/60 and 1/30 for vertical transportation.

3. Temperature: The operating temperature of the material is a key factor. Regular models are suitable for materials with temperatures below 100°C. However, if the material is hot, a high - temperature - resistant model should be selected, which can handle materials with temperatures ranging from 100 to 650 - 800°C.

4. Moisture Content: The moisture content of the material should be such that when the material is held in the hand and squeezed into a ball, it can still loosen when released. Excessive moisture can cause the material to agglomerate and compact, potentially leading to the "floating chain" problem.

5. Other Properties: Materials that are highly viscous, have a large suspension, are extremely mobile, have excessive compressibility, are very abrasive, are extremely hard, are fragile and not desired to be broken, or are corrosive (without proper anti - corrosion measures) are generally not suitable for regular buried scraper conveyors. Special models may be required for such materials.

Conveying Requirements
1.Capacity: Determine the required conveying capacity based on your production process. Select an appropriate trough width, carrying trough height, and scraper chain speed. The speed of the scraper chain usually ranges from 0.08 to 1.00 m/s. For example, materials with high abrasiveness like phosphate rock powder are better conveyed at a low speed, while grains can be conveyed at a relatively higher speed.

2. Distance and Angle: The horizontal conveying distance of a single - unit buried scraper conveyor is typically up to 80 - 120 m, and the vertical lifting height is about 20 - 30 m. If inclined transportation is needed, the inclination angle is generally between 0° and 25°. For vertical - type conveyors, the angle can range from 30° to 90°.

Component Selection
1.Scraper Chain: The selection of the chain depends mainly on the maximum tension of the conveying chain. Also, consider the material properties. For example, dusty materials are not suitable for roller chains, while materials prone to the "floating chain" phenomenon should preferably use roller chains. The type of scraper is chosen according to the material properties and the structure of the conveyor. For materials with high adhesion, a simple - type scraper is better to facilitate unloading and cleaning.

2. Head and Tail Parts: There are two types of head wheels, chain - disengaging devices, and tail wheels corresponding to drop - forged chains and roller chains. Once the chain type is determined, the appropriate components can be selected. The tail part is generally of the screw - tensioning type, with a tensioning stroke of 150 - 250 mm.

3. Feeding Section: There are two types of feeding sections: top - feeding (Type A) and side - feeding (Type B with a downward inclination of 55°). For materials with poor fluidity, Type A is preferred, while in general cases, Type B is a better choice.

4. Drive Unit: Calculate the power of the motor based on the speed of the scraper chain, the circumferential force of the drive wheel, etc. The rated power of the motor should be greater than the calculated power. For drive units with a power exceeding 15 kW, a hydraulic coupling is recommended to meet the heavy - load starting requirements and protect the motor.

Installation Environment
1.Indoor/Outdoor Installation: If the conveyor is installed outdoors, the drive unit should be protected against rain to prevent the motor from getting wet. All interfaces should be tightly sealed to prevent rainwater from entering the machine trough.

2. Space Layout: Consider the installation space and reserve an inspection passage or platform. There should be a hoisting hole and hoisting facilities on the building. The support of the buried scraper conveyor is generally configured by the user. It is necessary to consult the manufacturer about the support spacing, the fixing method between the conveyor and the support, and the stress conditions of the support.

By carefully considering these aspects, you can select a buried scraper conveyor that best suits your specific industrial application, ensuring efficient and reliable material transportation.

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