Cement production is a continuous, energy‑intensive process where every tonne of clinker depends on the reliable operation of kilns, mills, and conveyors. A single unplanned stop in the clinker line can cost a plant tens of thousands of dollars in lost output and fuel waste. In this case study, we examine how a cement plant in Central Asia avoided a catastrophic failure of its clinker conveyor drive by replacing a worn gear coupling with a Dalian Mairuisheng Fluid coupling. The result was not only the avoidance of a major breakdown but also a measurable reduction in energy consumption and maintenance workload.

The Specific Problem – Clinker Conveyor Under Extreme Stress

The plant operates a 4,000 tonnes‑per‑day clinker line. The clinker conveyor that feeds the cooler is a critical link: any stoppage here forces the kiln to reduce output or shut down entirely. The drive consists of a 160 kW motor, a helical gearbox, and the conveyor head shaft. For years, the plant used a gear‑type coupling between the motor and gearbox. Clinker is abrasive and can arrive in large, irregular lumps. When a lump jammed the conveyor, the gear coupling transmitted the full stall torque to the gearbox, causing repeated damage to the intermediate shaft bearings. The maintenance team had replaced these bearings four times in eighteen months. Each replacement required 14 hours of downtime and cost approximately $9,000 in parts and labour.

The Solution – A Fluid Coupling Sized for Cement Duty

After reviewing the drive parameters, Dalian Mairuisheng recommended a YOX‑560 Hydrodynamic coupling with a standard constant fill. This size was selected because the conveyor requires a breakaway torque of approximately 2.2 times the nominal motor torque, and the Fluid coupling naturally limits torque to this level during a jam. Unlike a gear coupling, the Hydrodynamic coupling has no mechanical contact between the pump wheel and turbine, so there are no wearing parts to replace. The unit was supplied with dust‑resistant seals and an external oil sight glass for easy level checks in the plant’s dusty atmosphere.

Installation – Completed During a Scheduled Kiln Stop

The plant scheduled the retrofit during a routine kiln maintenance stop, avoiding any additional production loss. The old gear coupling was removed, and the Fluid coupling was mounted on the same shafts without modification. Because the Hydrodynamic coupling is lighter than the gear coupling it replaced, no foundation work was needed. The entire installation, including alignment and oil filling, took one shift. The plant’s maintenance team received a short training session on checking the oil level and interpreting the sight glass.

The Results After 12 Months of Operation

• Zero bearing failures on the conveyor gearbox intermediate shaft.

• Three jam events occurred during the year; in each case, the Fluid coupling slipped, the motor continued running, and the operator cleared the jam within 20 minutes.

• No gearbox damage was found during the annual inspection.

• Energy saving of approximately 6% on the conveyor drive, due to lower starting current and reduced peak demand.

• Maintenance cost reduction of $36,000 per year, based on avoided bearing replacements alone.

Why the Hydrodynamic Coupling Suits Cement Plants

Cement plants present a combination of challenges that make the Fluid coupling particularly valuable. The environment is hot and dusty, so electronic soft starters require sealed cabinets and cooling. The Fluid coupling has no electronics and can operate in ambient temperatures up to 80°C. Loads are highly variable because clinker and raw material feed rates fluctuate, and occasional jams are inevitable. The Hydrodynamic coupling absorbs these variations without transmitting shock to the gearbox. Finally, cement plants run 24/7, so maintenance windows are short. The Fluid coupling requires only oil changes every 8,000 hours and has no wearing friction surfaces.

Conclusion – A Proven Investment for Cement Producers

This case study demonstrates that upgrading to a Fluid coupling is one of the most cost‑effective improvements a cement plant can make. The Hydrodynamic coupling protects the gearbox, reduces maintenance, saves energy, and eliminates the risk of a jam turning into a catastrophic breakdown. Dalian Mairuisheng supplies Fluid couplings specifically configured for cement industry drives, including kiln, mill, and conveyor applications. Contact our engineers to discuss your specific drive parameters.