Lawn Tractor Solid PU Tire Line in United States

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Haifeng successfully engineered and commissioned an automated 16-station rotary carousel polyurethane tire molding line for a major commercial lawn tractor OEM in North America, achieving 100% flat-free reliability while maintaining pneumatic-equivalent cushioning. The turnkey project covered the complete delivery of high-pressure dual-component metering equipment, a 6-axis robotic pouring station, an indexed 16-station heated rotary carousel, and automated rim induction preheaters.

Prior to commissioning, commercial landscaping contractors using the customer's zero-turn mowers experienced severe downtime from flat front caster tires punctured by locust thorns and sharp fencing wire. Attempts to use solid hard rubber casters resulted in customer complaints regarding aggressive turf tearing and operator back fatigue. The client required an automated manufacturing system capable of injecting microcellular polyurethane formulations directly around reinforced plastic wheel rims, locking part density at 520 kg/m³ to deliver pneumatic shock absorption without puncture risks.

Operating since May 2019 on a continuous two-shift daily schedule across a 320 m² workshop, the workcell outputs over 700 finished caster assemblies daily. By deploying Haifeng's closed-loop Ratio Lock flow algorithms and robotic contour pouring, the client reliably manufactures balanced, durable flat-free wheels that have virtually eliminated field flat tire warranty claims.

Project Technical Specification Matrix:

Haifeng deployed a high-speed reaction injection tire cell optimized for microcellular polyurethane elastomeric formulations:

1. Rim Induction Preheating: Composite plastic wheel rims are preheated by an automated induction tunnel to 58°C, activating chemical bonding agents on the wheel hub core.
2. High-Pressure Micro-Volume Dispensing: Servo-driven axial displacement pumps meter formulated polyols and isocyanates at 170 bar with ±0.5% stoichiometric precision.
3. 6-Axis Robotic Port Injection: A robot-guided mixing head docks directly with mold injection ports, filling rotating cavities cleanly without splashing or bubble entrapment.
4. 16-Station Indexed Carousel: Precision turntable carries water-jacketed aluminum molds through a heated curing arch, holding mold temperatures steady at 60°C (±0.8°C).

Installation and commissioning: 22 days. Operator training: 4 days. Warranty: 1 year. Long-term spare parts and remote PLC diagnostic support are available.