General Specifications of Coal Transport Semi-Trailers

1. Dimensions

Overall External Dimensions (varies by axle configuration):

3-axle model (standard for long-haul coal transport): 13.0–13.7 m (L) × 2.55 m (W) × 3.8–4.0 m (H, including side walls)

4-axle model (for heavy-duty coal transport): 14.6–15.0 m (L) × 2.55 m (W) × 3.8–4.2 m (H)

Cargo Box Internal Dimensions (core for coal volume):

3-axle model: 12.5–13.2 m (L) × 2.45 m (W) × 2.0–2.2 m (H, side wall height); Volume: 60–75 m³

4-axle model: 14.0–14.7 m (L) × 2.45 m (W) × 2.1–2.3 m (H); Volume: 75–90 m³

Ground Clearance: 0.45–0.55 m (ensures stability for heavy coal loads; lower than general semi-trailers)

2. Load Capacity

Tare Weight (Empty Weight):

3-axle model: 7,500–9,000 kg (lightweight design uses high-strength steel to maximize payload)

4-axle model: 9,500–11,000 kg

Gross Vehicle Weight Rating (GVWR):

3-axle model: 34,000–36,000 kg (complies with most regional heavy-duty transport limits)

4-axle model: 48,000–49,000 kg (for ultra-heavy coal transport, e.g., mine-to-port routes)

Payload Capacity (critical for coal transport efficiency):

3-axle model: 25,000–28,500 kg (matches coal density of 1.3–1.8 t/m³; fills 60–75 m³ cargo box)

4-axle model: 37,000–39,500 kg

3. Cargo Box Design (Coal-Specific Features)

Material:

Floor: Wear-resistant steel (Q345B or Hardox 450) – 10–12 mm thickness (resists friction from sharp coal particles)

Side Walls: High-tensile carbon steel (Q345) – 6–8 mm thickness; reinforced with 80×80 mm steel square tubes (prevents deformation under heavy coal pressure)

Optional Closed Structure: Fiberglass or steel roof (for dust control in eco-sensitive areas; equipped with electric roll-up curtains for easy loading/unloading)

Structure:

High-side design: 2.0–2.3 m side wall height (prevents coal spillage during transport, especially on bumpy roads)

Sloped Floor: 3–5° rearward slope (aids in quick, complete unloading; no residual coal left)

Rainproof Cover: Detachable PVC tarpaulin (standard) or electric automatic tarpaulin (optional; protects coal from rain/water to avoid caking)

4. Chassis & Suspension

Frame:

Main Rails: High-strength steel I-beams (300×150×8 mm or 320×160×10 mm) – welded structure for heavy-load durability

Cross Beams: 140×60×5 mm steel channels; spaced 0.5–0.6 m apart (enhances floor support and load distribution)

Suspension System:

Standard: Heavy-duty mechanical leaf spring suspension (10–12 leaves per axle; cost-effective for coal transport's repetitive heavy loads)

Optional: Air suspension (for long-haul routes; reduces vibration to protect the chassis and minimize coal dust leakage)

Axles:

Type: Solid steel drive-support axles (rated load: 11,500–13,000 kg per axle for 3-axle models; 12,000–15,000 kg per axle for 4-axle models)

Brand: BPW, SAF-Holland, or Chinese domestic brands (e.g., CIMC) – industry-proven reliability

5. Tires & Braking System

Tires:

Size: 12R22.5 (radial tires; most common for heavy coal transport) or 11R22.5 (for lightweight 3-axle models)

Load Rating: 5,400 kg per tire (16PR; matches axle load capacity)

Tread Pattern: Block-type deep tread (18–22 mm depth; provides strong traction on mine roads or muddy construction sites)

Braking System:

Service Brakes: Drum brakes (standard; low maintenance cost for heavy loads) or disc brakes (optional; better heat dissipation for long downhill coal transport routes)

Safety Systems: ABS (Anti-lock Braking System) + EBS (Electronic Braking System) (mandatory for regional compliance, e.g., China GB 7258, EU ECE R13)

Parking Brake: Mechanical handbrake (acts on rear axles; secure for parking at coal yards)

6. Safety & Environmental Features

Safety Devices:

Reflective strips (full-body coverage, including front/rear/side) + LED warning lights (red rear lights, amber side marker lights) – enhances visibility at night or in foggy mine areas

Anti-collision rear bumper (reinforced steel; 10 mm thickness) – protects the chassis from impact during loading/unloading

Emergency stop valve (installed on the rear; cuts off air supply to brakes if anomalies occur)

Environmental Protection:

Dust-Proof Seals: Rubber gaskets on side wall joints and tarpaulin edges (reduces coal dust emission during transport, complying with EU EPA or China's environmental standards)

Optional Closed Cargo Box: Fully enclosed steel structure (for regions with strict dust control, e.g., urban outskirts or near residential areas)

7. Compliance & Certifications

Regional Certifications:

China: CCC certification, GB 1589 (vehicle dimensions/weight limits), GB 23254 (heavy-duty vehicle fuel consumption limits)

Europe: CE certification, ECE R66 (rollover protection), ECE R74 (trailer braking)

North America: DOT certification, FMVSS 121 (braking requirements)

Industry Standards: ISO 3833 (commercial vehicle classification), ISO 11992 (trailer couplings for coal transport traction)

8. Customization Options

Cargo Box Upgrades:

Wear-resistant liner (Hardox 500, 4–6 mm thickness) – extends floor service life by 50% for abrasive coal types (e.g., coking coal)

Higher side walls (up to 2.5 m) – increases cargo volume by 10–15% for low-density coal (e.g., lignite)

Functional Add-Ons:

Electric automatic tarpaulin (remote control operation; saves time vs. manual tarpaulins)

Side discharge doors (optional; for quick unloading at narrow coal storage yards)

Toolbox (mounted on the frame; stores tarpaulin repair tools, chains, or gloves)

Product Introduction

This 3-Axle Heavy-Duty Coal Transport Semi-Trailer with 70m³ Cargo Capacity is a professional solution tailored for bulk coal transport scenarios-including mine-to-plant, mine-to-port, and inter-regional coal distribution. Engineered to address coal's high density (1.3–1.8 t/m³) and abrasive nature, it integrates a wear-resistant cargo box, high-load-bearing chassis, and dust-proof design to minimize spillage, reduce maintenance costs, and maximize transport efficiency. With a 70m³ cargo volume and 28,000 kg payload capacity, it complies with global heavy-duty transport standards (e.g., China GB 1589, EU ECE R66) and is ideal for coal logistics companies, power plants, and mining enterprises seeking reliable, high-performance bulk transport equipment.

 Product Content Introduction

3-Axle Heavy-Duty Coal Transport Semi-Trailer with 70m³ Cargo Capacity features a coal-specific cargo box design that balances durability and functionality. The box floor is made of 10mm-thick Hardox 450 wear-resistant steel-resisting scratches and erosion from sharp coal particles, and extending service life by 50% compared to standard carbon steel. Its internal dimensions (13.0m L × 2.45m W × 2.2m H) deliver a 70m³ volume, while 2.2m-high side walls (reinforced with 80×80mm steel square tubes) prevent coal spillage during bumpy transport. An electric automatic PVC tarpaulin (remote-controlled) comes standard, shielding coal from rain to avoid caking and reducing dust emission-meeting environmental requirements for urban and suburban transport routes.

3-Axle Heavy-Duty Coal Transport Semi-Trailer with 70m³ Cargo Capacity boasts exceptional load-bearing capability supported by a robust chassis. It has a tare weight of 8,000 kg, gross vehicle weight rating (GVWR) of 36,000 kg, and payload capacity of 28,000 kg-enough to carry 47.6 tons of coal (at 1.7 t/m³ density) in a single trip, cutting transport cycles by 20% vs. smaller 50m³ models. The chassis uses 320×160×10mm high-strength steel I-beams as main rails, paired with 140×60×5mm cross beams (spaced 0.5m apart) to evenly distribute heavy coal loads, avoiding local deformation even under full payload.

3-Axle Heavy-Duty Coal Transport Semi-Trailer with 70m³ Cargo Capacity is equipped with a stable axle and suspension system for complex coal transport roads. It adopts 3 heavy-duty solid steel axles (each rated 12,000 kg, brand: BPW) with heavy-duty mechanical leaf spring suspension (12 leaves per axle)-absorbing vibrations on uneven mine roads and gravel paths, and protecting the chassis from impact. The 12R22.5 radial tires (16PR load rating, 5,400 kg per tire) feature block-type deep tread (20mm depth), providing strong traction on muddy or slippery surfaces common in mining areas.

3-Axle Heavy-Duty Coal Transport Semi-Trailer with 70m³ Cargo Capacity prioritizes safety and compliance with global transport regulations. Its braking system includes drum brakes (low maintenance for heavy loads) + ABS (Anti-lock Braking System) + EBS (Electronic Braking System)-ensuring stable stopping even when fully loaded (36,000 kg) at downhill speeds of 40 km/h. Full-body reflective strips (front/rear/side) and LED warning lights enhance visibility at night or in foggy mine environments, while an emergency stop valve (rear-mounted) cuts off brake air supply in anomalies, reducing accident risks. It holds CCC (China), CE (Europe), and DOT (North America) certifications, enabling legal operation across major markets.

3-Axle Heavy-Duty Coal Transport Semi-Trailer with 70m³ Cargo Capacity offers flexible customization to match diverse coal transport needs. For abrasive coal types (e.g., coking coal), buyers can upgrade the floor to 12mm-thick Hardox 500 steel; for low-density lignite, higher 2.5m side walls (increasing volume to 80m³) are available. Additional options include side discharge doors (for quick unloading at narrow storage yards), a toolbox (mounted on the frame for tarpaulin tools), and air suspension (for long-haul highway routes to reduce chassis wear). For eco-sensitive regions, a fully enclosed steel cargo box (instead of tarpaulin) can be fitted to eliminate dust emission entirely.

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