Project Background
Faced with the three major pain points of imported fasteners for CRRC Group's CR240E mining trucks — high procurement costs, long lead times and significant supply-chain risk — Ningxin Huida moved the programme in-house. Under extreme working conditions, mining trucks place exceedingly stringent requirements on bolt anti-loosening, hose-clamp sealing and the structural strength of castings, while the 45-day procurement lead time of imported parts was severely restricting production scheduling.
Technical Challenges
Continuous heavy-duty vibration means uneven stress distribution across the thread pair, which drains preload and shortens bolt life. Conventional fasteners cannot hold preload in this duty.
The sealing life of hydraulic and pneumatic hose clamps directly determines vehicle reliability; conventional elastic structures do not cover the full service life of the vehicle.
Key load-bearing castings must be lighter to cut energy use and improve mobility, without compromising structural strength.
Our Solution
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Patented bolt dynamic locking
An original optimisation of thread stress distribution raises vibration fatigue resistance by 40%, removing the hidden risk of loosening on mining trucks.
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Adaptive sealing hose clamp
A patented elastic structure takes pipeline sealing life beyond 8,000 hours, exceeding the imported benchmark.
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Lightweight integrated casting
Topology optimisation delivers a 15% weight reduction on key load-bearing components with no loss of strength.
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From sample to stable batch supply
Samples were supplied first so the customer could complete assembly validation and performance evaluation; heat treatment, surface treatment and thread tolerances were then frozen into production documentation before moving to stable batch production, with inspection records issued per batch.
Delivery Results
- Vibration fatigue resistance improved by **40%**
- Key load-bearing castings **15% lighter** with no strength loss
- Awarded CRRC **"Quality Benchmark Supplier"** certification
- Property class fully traceable, with material and inspection records per batch
Site & Inspection
Client Testimonial
Ningxin Huida not only solved the "bottleneck" problems with patented technologies, but its dedicated on-site service team also collaborated with us day and night to tackle challenges, truly living up to the promise of "shared glory with partners".— Purchasing Director, Equipment Division, CRRC Group