Mining operations can be described as the ‘Extreme Challenge’ of the industrial sector—equipment must withstand the impact of tonnes of ore, the corrosive effects of high-concentration dust, the dual challenges of high temperatures and humidity underground, as well as fatigue damage caused by continuous, high-intensity operation. Conventional bearings are prone to premature failure under complex operating conditions such as heavy loads, vibration and off-centre loading, leading to equipment downtime, soaring maintenance costs and even safety incidents. Thanks to three key advantages, Xiangli Precision’s self-aligning roller bearings have emerged as the crucial solution for mining machinery to overcome these operational challenges.

1. Withstands heavy-duty impacts: Double-row roller design doubles load-carrying capacity

Mining equipment (such as crushers and hoists) must withstand the combined effects of dynamic loads and impact forces. Xiangli Precision’s self-aligning roller bearings feature a double-row symmetrical roller arrangement; by optimising the contact angle between the rollers and raceways, they achieve simultaneous support of radial loads and bidirectional axial loads. For example, in jaw crushers, the 23136CA bearing can stably support the impact forces generated by the swinging of the moving jaw. With a rated dynamic load of 965 kN, it offers a 126% increase in service life compared to conventional bearings, ensuring the equipment can operate continuously for over 8,600 hours at a capacity of 1,200 tph.

2. “Stable” under Vibration and Off-Centre Loads: Self-aligning Technology Compensates for Installation Errors

In mining operations, foundation settlement, shaft deflection or installation misalignment can easily lead to off-centre bearing loads, causing stress concentration at the edges and premature failure. Xiangli Precision Engineering’s self-aligning roller bearings feature a spherical raceway design on the outer ring, allowing for an angular misalignment of 1°–2.5° between the shaft and bearing housing, thereby automatically compensating for dynamic deviations during operation. Following the adoption of this technology in a vibrating screen at a certain iron ore mine, the equipment failure rate was reduced by 80%, with an annual increase in ore production of 200,000 tonnes, completely eliminating the problem of screen mesh breakage caused by bearing misalignment.

3. “Withstands” Harsh Environments: Sealing Protection + Specialised Materials, Resistant to Dust and High Temperatures

Underground dust concentrations can reach 500 mg/m³, whilst high-temperature environments (such as dryers reaching 200°C) place stringent demands on bearing seals and materials. Xiangli Precision Engineering has built an “impregnable fortress” through a three-layer protection system:

Labyrinth seals + rubber lip seals: dual barriers against dust ingress, extending grease service life;

Carbonitriding treatment: enhances the inner ring’s crack resistance and maintains dimensional stability at high temperatures;

Specialised steel grades (e.g. Inconel 718): withstands extreme temperature fluctuations and prevents material embrittlement.

After a copper mine’s cone crusher was retrofitted with Xiangli Precision Engineering bearings, it operated continuously for 6,000 hours under conditions of excessive dust concentration, achieving a threefold increase in service life compared to the original bearings.

Typical Application Scenarios

Crushing Stage: Heavy-duty load-bearing, crushing ‘giants’

Jaw Crushers: The moving jaw support bearings must withstand the impact of falling ore and friction from reciprocating motion. Xiangli Precision Engineering’s 23136CA bearings, featuring reinforced steel plate cages and high-precision machining, reduce operational vibration and increase the equipment’s processing capacity by 15%.

Cone Crushers: Main shaft bearings must cope with high-speed rotation and complex loads. The 22228CA bearing optimises the roller contact angle and reduces the coefficient of friction, achieving 18 months of continuous, fault-free operation at a gold mine.

2. Screening Stage: Precise Alignment, Say Goodbye to ‘Screen Mesh Strikes’

Vibrating screens are the core equipment in mining screening operations, and their bearings must withstand high-frequency vibrations and off-centre loads. Xiangli Precision Engineering employs a ‘self-aligning roller bearing + cylindrical roller bearing’ combination:

Self-aligning roller bearings (e.g. 22312EMA): support the movement of the screen body and compensate for installation misalignment;

Cylindrical roller bearings (e.g. NU224EM): provide axial positioning to ensure uniform screen tension.