Belt Conveyor Systems: How They Work and How to Choose TD75 or DTII
Author :
Daniel Carter
Learn how belt conveyors work and compare TD75 and DTII belt widths, speeds, and operating conditions to choose a system for your material handling needs.
A belt conveyor is designed to move materials continuously from one point to another, making it one of the most relied-upon machines in bulk material handling. From coal mines and ports to warehouse floors and cement plants, these systems have revolutionized how industries transport large volumes of product across short or long distances. This article covers how belt conveyor systems work, the different types available, and a neutral, application-based comparison between the TD75 and DTII series to help you learn which configuration fits your needs.
- Continuous, efficient movement of bulk materials or unit loads
- Adaptable to horizontal, inclined, and complex path layouts
- Scalable capacity based on belt width, speed, and material properties
- Reduced manual labor compared to batch transport methods
- Integration with automated plant logistics and other systems
How a Belt Conveyor Works
A conveyor system converts motor power into continuous belt motion, moving materials forward along a defined path. At its core, a conveyor belt consists of a flexible belt looped over pulleys, powered by a motor and gearbox that rotate the drive pulley, which transmits motion to the belt through friction. The key components of any belt conveyor system include:
- Drive unit: Electric motor plus gearbox, sized for the required load, speed, length, and lift
- Drive pulley: Transmits torque to the belt; often lagged with rubber for improved grip
- Tail pulley: Redirects the belt at the opposite end; a take-up device provides the required tension
- Idler rollers: Support the belt along both carrying and return runs
- Conveyor belt: The flexible loop itself, with cover materials such as rubber or PVC and reinforcement selected for the application
- Frame and structure: Steel supports holding all components in place
- Loading/unloading hoppers: Feed and discharge points for materials
- Control system: Manages the speed and direction of conveyor belts, including safety switches and sensors that monitor conveyor status for real-time adjustments
The motor drive powers the drive pulley to move the belt. Friction between pulley and belt pulls the belt forward, carrying the load along the carrying run. At the discharge end, material drops off, and the belt returns underneath. A tensioning device keeps the belt taut to prevent slipping or misalignment. Conveyors equipped with suitable motor controls can adjust belt speed using variable frequency drives (VFDs), sometimes called variable speed drives, giving operators precise control over operation.
Belt materials include rubber covers for abrasive or heavy materials like coal and ore, and PVC covers for lighter applications; food-handling applications require a belt specifically approved for the intended use. Nylon fabric and steel cords are reinforcement options selected according to belt tension and duty. Belt speed, width, and strength directly impact material transportation capacity. The TD75 product table lists speeds from 0.8–4.0 m/s, while the DTII table includes speeds up to 6.5 m/s, depending on belt width and configuration.
Types of Belt Conveyors
Different belt conveyor configurations exist to accommodate various industries, plant layouts, and material characteristics. Types of belt conveyors include flat, troughed, modular, and inclined/declined designs, each suited to specific tasks.
- Fixed belt conveyors: Permanent installations in power stations, mines, and ports, such as conveyors supplying coal to thermal power plants.
- Mobile belt conveyors: Portable units for stockpiling or loading, including grain-handling applications.
- Flat belt conveyors: Versatile for packaging and light loads, moving cartons in warehouse environments or packages along sorting lines.
- Troughed belt conveyors: Allow for higher carrying capacity for bulk materials by shaping the belt into a trough with angled idler rollers. Standard in coal and ore transport.
- Inclined conveyors: Designed to move materials along a slope between different elevations, such as from a mine pit up to a processing plant.
- Modular belt conveyors: Consist of interlocking plastic segments, suitable for food processing where hygiene and easy cleaning matter. Belt conveyors can also navigate curves using modular or curved belt designs.
- Reversible belt conveyors: Conveyor systems can move in both directions for flexibility in stockpile reclaiming or space-constrained layouts.
A common application of belt conveyors is moving cartons in warehouse environments, where modern conveyor systems integrate with Warehouse Management Systems (WMS). Conveyor systems can automate material handling operations to improve efficiency across manufacturing, mining, warehousing, and food processing. Maintenance and cleaning considerations vary based on belt type and application.
TD75 vs. DTII: Fixed Belt Conveyor Options
Both TD75 and DTII belong to the fixed belt conveyor category—designed for long-term, plant-based installations handling bulk materials across various industries.
TD75 Type Fixed Belt Conveyor
The TD75 type fixed belt conveyor is a widely used series for bulk material handling. It is commonly applied in metallurgy, coal, transportation, light textile, and hydropower to convey bulk materials or unitized items such as packages and bagged goods.
Structure and performance: The TD75 features a simple structure. Available belt widths are 500, 650, 800, 1,000, 1,200, and 1,400 mm, with listed belt speeds from 0.8 to 4.0 m/s depending on belt width and idler arrangement. The troughing-idler table lists capacities from 78 to 2,996 t/h, and the flat-idler table starts at 41 t/h. These values are calculated at a material bulk density of 1.0 t/m³, a conveyor inclination of 0°–7°, and a material dynamic accumulation angle of 30°.
Why choose TD75? Its simplicity makes it practical for standard conveying applications. The product page highlights easy maintenance, low cost, and versatility. When the required throughput and working conditions fit the published specifications, the TD75 is a candidate for a cost-effective configuration. Actual investment and maintenance requirements depend on the final design.
TD75 is typically suitable when:
- Throughput requirements fit the selected belt width, speed, and idler arrangement
- Material bulk density is ≤ 2.5 t/m³
- Ambient temperature is within −10°C to +40°C and conveyed material temperature is below 50°C; special conditions require corresponding protective measures
- Budget and maintenance requirements favor a simple configuration
DTII Type Fixed Belt Conveyor
The DTII type fixed belt conveyor is a general-purpose series widely used in metallurgy, mining, coal, ports, power stations, building materials, chemical industry, light industry, and petroleum. Its published table offers a wider range of belt widths than the TD75 table.
Structure and configuration: The DTII series lists belt widths from 500 to 2,400 mm and belt speeds up to 6.5 m/s for certain wider-belt configurations. The page notes that 4.5 and 5.6 m/s are tabulated calculation values and are not recommended. The listed drive arrangement includes a motor, hydraulic coupling, and DBY or DCY reducer; an electric drum is an option when drive power is below 55 kW. Conveyor length, inclination, belt reinforcement, and motor rating must be selected for the project.
Why choose DTII? Its broader published belt-width range makes it a candidate when a project requires wider belts or configurations beyond the TD75 table. The product page covers single-unit conveying and horizontal or inclined systems formed with other conveyors. Port bulk handling and power-plant fuel conveying are relevant applications, with final selection based on material properties, throughput, layout, and operating conditions.
DTII is typically suitable when:
- The required throughput calls for evaluation of the wider belt options in the DTII range
- Material bulk density is 0.5–2.5 t/m³, with particle size checked against the belt-width table; for hard rock on belts wider than 1,200 mm, the page limits maximum particle size to 350 mm
- The project requires a horizontal or inclined conveying system
- Ambient temperature is within −25°C to +40°C; special environments require corresponding protective measures
- The selected drive, belt, and structure meet the required duty cycle and reliability targets
TD75 and DTII Comparison
Both TD75 and DTII belt conveyors are mature, widely used conveyor systems in industrial material handling. Neither is universally "better"—selection should be based on specific operating conditions and conveying requirements.
| Dimension | TD75 | DTII |
|---|---|---|
| Published applications | Metallurgy, coal, transportation, light textile, hydropower | Metallurgy, mining, coal, ports, power stations, building materials, chemicals, light industry, petroleum |
| Belt width range | 500–1,400 mm | 500–2,400 mm |
| Highest listed belt speed | 4.0 m/s for certain configurations | 6.5 m/s for certain configurations; 4.5 and 5.6 m/s are not recommended by the page |
| Ambient temperature | −10°C to +40°C | −25°C to +40°C |
| Material bulk density | Up to 2.5 t/m³ | 0.5–2.5 t/m³ |
Selection should always be driven by material characteristics (bulk density, abrasiveness, lump size), required throughput, layout constraints, duty cycle, and environmental factors. Neither model should be selected based on brand preference alone—accuracy in matching the conveyor to the application is what delivers long-term productivity and reduces total cost of ownership.
Design Inputs for a Belt Conveyor System
Beyond choosing between TD75 and DTII, engineers must design each belt conveyor system according to project-specific data.
Main design inputs include:
- Required conveying capacity (t/h) and material properties (density, size, moisture)
- Conveyor length, routing, and lift height
- Ambient environment (temperature, dust, humidity)
- Duty cycle (continuous 24/7 or periodic start-stop operation)
- Required reliability and maintenance logistics
These inputs determine belt width, speed, motor power, pulley diameters, idler spacing, and frame design. Properly sizing conveyor belts and drives—avoiding over-engineering—reduces power consumption and wear over many years. Control systems with sensors and automated monitoring further improve efficiency, while safety switches, emergency stop pull-cords, and guarding must be specified and assessed against applicable safety requirements.
Conveyor belts can use rubber or PVC covers with fabric or steel-cord reinforcement, depending on operating conditions. Share your material characteristics, throughput needs, and layout constraints with your engineering team so they can select either a TD75 or DTII configuration—or a customized conveyor system—that best matches your real needs. Learn more about Yiyun, review its service information, or contact the team to discuss your project.
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