Select premium chassis modified for high-voltage trolley connection & heavy-duty open pit extraction
Global open-pit mining operations are facing unprecedented pressure to decarbonize. Diesel haul trucks represent up to 70-80% of a mine's direct site emissions (Scope 1). As heavy haulage units climb steep exit ramps, diesel engines operate at peak thermal strain, consuming excessive quantities of fuel. Trolley Assist Haul Systems act as a game-changing bridge technology that solves this efficiency gap.
By using a truck-mounted pantograph system connected to overhead electrical catenary lines, the mechanical propulsion load shifts directly from the diesel engine to the power grid. When connected to the trolley line, the diesel engine transitions to idle speed, while electric traction motors run on clean power. The results are monumental: a 70% to 90% reduction in diesel fuel consumption on ramps, doubled haulage speeds, and significantly reduced engine maintenance intervals.
When retrofitted with dynamic pantographs, diesel-electric haul fleets leverage regenerative braking and high torque overhead grid supply, reducing wear on mechanical components while bypassing standard fuel limitations.
Founded in 2014 in Deyang City, Sichuan Province, China, our company focused heavily on truck trading in China's domestic market during the start-up phase. We successfully established an initial customer network in the local market, refining our engineering and logistical capabilities.
In 2022, management decided to open up foreign markets, realizing the first major expansion of the business under the HONGKAI banner. We expanded rapidly into foreign trade, establishing significant partnerships in Africa, the Middle East, and Central Asian countries. In 2023, the company boosted investment in foreign trade, built a proprietary factory, and improved operational capacity, making a significant breakthrough in refurbished and customized heavy trucks.
Presently, our headquarters is located in Shundi Auto Trade City, Deyang City, featuring a modernized office area covering 15,000 square meters. Alongside this head office, we maintain our own comprehensive truck testing center and modification factory.
Our main factory is located in Chengdu, Sichuan Province, covering a massive area of 196,000 square meters. The total number of employees has reached 186, including a dedicated professional sales team, specialized technical research & development personnel, after-sales service teams, and efficient logistics personnel. We also run a large warehousing center to accommodate a high volume of trucks in stock, ensuring minimal delivery lead times.
A Brief History of the Growth of Hongkai Automobile Trading Co., Ltd. - The Evolutionary Path from Dealer to Ecological Builder
Entering the field of truck sales, accumulating frontline practical experience amidst the roar of diesel engines, and refining the demand map of Chinese heavy-duty truck users.
Established a partnership sales company, pioneered the industry's "financial leasing + maintenance and trusteeship" integrated service, and achieved full coverage of logistics nodes in six provinces in South China within three years.
Independently operated Hongkai Automobile Trade, focusing on the high-end heavy truck market, and building a full-chain system of procurement-modification-certification-after-sales.
Build a 20,000 square meter Hongkai Automobile Trade City. After the completion of this landmark building, the annual sales volume exceeds 50 million yuan. Representing first-line brands, including Sinotruk HOWO, Dongfeng, Jiefang, and Shaanxi Automobile.
Established its own transport fleet, and the first batch of 100+ smart heavy-duty trucks were invested, allowing customer delivery within 48 hours to logistics nodes in South China.
Launch global strategy (taking 10 months). Vigorously promote product advantages through a diversified promotion model combining online and offline to explore key international markets, particularly the African mining and logistics corridors.
Engineered integration of electrical collector systems and heavy diesel-electric powertrain platforms
The control software monitors electric current grid stability before lowering pantograph connection arms. When the truck leaves the overhead lines, it switches back to diesel power seamlessly, without loss of momentum on steep gradients.
Mines require high-voltage rectifier substations spaced systematically along haul ramps. Typical operational specs utilize 1,200V to 1,800V DC overhead catenary lines, providing steady energy input to multi-phase AC traction systems.
Features state-of-the-art automatic ground fault indicators, lightning protection loops, and pneumatic mechanical retractors that instantly disconnect the pantograph if misalignment is detected.
| Specification Parameter | Standard Diesel Haulage | Trolley Assist Mode (Grid-Powered) | Operational Advantage |
|---|---|---|---|
| Ramp Speed (8-10% Gradient) | 11 - 13 km/h | 24 - 28 km/h | Doubles throughput capacity on critical exit ramps. |
| Diesel Fuel Consumption | 350 - 400 Liters/hour | 35 - 45 Liters/hour (engine idling) | Saves up to 90% fuel on the grade climb. |
| Engine Mean Time Between Overhauls | 16,000 - 20,000 hours | 28,000 - 32,000 hours | Lower thermal loads extend structural components. |
| Scope 1 Greenhouse Gas Emissions | 100% baseline output | Reduced by up to 95% (if grid is green) | Enables direct carbon credit qualification. |
Why mining operators trust Hongkai's industrial manufacturing network
Industry Deep Plowing: Over 20 years of experience in the heavy truck and logistics equipment industry. We understand evolving regulatory landscapes, emission parameters, and operational bottlenecks.
Professional Qualifications: Our technicians are fully certified for structural retrofitting, high-voltage electrical safety, and industrial engine optimization, ensuring maximum field reliability.
Personalized Customization: Every mine site has unique incline levels, curve radii, and grid voltages. We collaborate from programmatic design to structural execution to align the pantographs with your specific site requirements.
Excellent Quality Assurance: From vehicle entry to final roll-out, we maintain a strict multi-point quality check. Every modified vehicle undergo dynamic simulation testing before export.
All-round Service System: We handle pre-sale consulting, in-sale order progress updates, and post-sale technical training. We provide 7x24-hour rapid-response technical troubleshooting globally.
Long-term Cooperations: Building stable, win-win relationships with mining firms and heavy-industry contractors worldwide. Our repeat purchase metrics demonstrate our commitment to long-term value.
We adhere closely to our fundamental values of "integrity, professionalism, innovation, and win-win". Integrity serves as our business foundation, ensuring that technical specifications, equipment condition audits, and contract terms are transparent and fair for every global buyer.
Professionalism is visible in our team's deep technical capabilities. From custom modifications of high-voltage circuits to structural heavy-duty steel welding, our work meets international quality standards. Innovation keeps us moving forward, prompting us to research green energy avenues like trolley assist adaptations for various heavy haul configurations. Finally, our win-win philosophy aligns our success with that of our partners, helping them minimize operational cost-per-ton and improve site safety.
Welcoming mining operators, procurement managers, and logistics fleet specialists from around the world
When requesting quotes for trolley assist haul trucks, project managers should look at the total system cost rather than just the truck's base price. A typical budget breakdown includes:
For complete details on customized fleet retrofits, component sourcing, and bulk pricing schedules, contact our commercial division for a detailed, tailored quote.
Operating high-voltage trolley lines on active haul ramps requires strict compliance with international safety protocols. Our engineering designs follow strict guidelines, including:
We dispatch technical experts to your mine site to assist during commissioning, pantograph calibration, and operator safety training, ensuring smooth integration with local power grids.
The trolley assist model is not static; it is adapting to tomorrow's zero-emission mining goals. Our development plan includes integration with Battery Electric Vehicles (BEVs).
Under this design, haul trucks charge their onboard battery packs while running under the trolley line on the ramp climb. This eliminates the need for stationary charging stops, optimizing fleet utilization and enabling fully carbon-neutral open-pit mine haulage.
Technical and commercial insights into Trolley Assist Haul Truck systems
Durable, heavy-duty chassis configurations optimized for global shipping and demanding industrial environments
