LTZC external gear ball screw combination bearings have been successfully delivered.

LTZC successfully developed an external gear ball and roller combination bearing, supporting Zoomlion Heavy Industry's stacker-reclaimer equipment.

In the manufacturing of heavy machinery, bearings are one of the crucial core components, required to withstand heavy loads while performing precise rotation. In recent years, with the continuous advancement of technology, the market demand for large-diameter, high-load, and high-precision bearings has been steadily increasing.  Leveraging over 20 years of bearing manufacturing experience, along with its strong R&D capabilities and exquisite manufacturing processes, LTZC has continuously innovated in the bearing field, successfully developing an external gear ball and roller combination bearing for Zoomlion Heavy Industry – model number 121.36.4750.03, with an outer diameter of Φ5000.4mm. This bearing is one of the largest slewing bearings used in stacker-reclaimer equipment in China. This case not only demonstrates LTZC's technical strength but also highlights its professionalism in the field of large-scale bearing manufacturing.

I. Bearing Background and Application Fields

Stacker-reclaimers, as important equipment in mining, ports, and logistics, are widely used in the loading, stacking, and transfer of bulk materials. With the improvement of equipment functionality, the requirements for stacker-reclaimer bearings have also gradually increased. Especially when facing challenges such as extremely high loads, long-term operation, and complex working conditions, bearings must not only withstand heavy loads but also possess excellent wear resistance, corrosion resistance, and precision. Zoomlion Heavy Industry, as a leading domestic heavy machinery manufacturer, has always been committed to providing customers with efficient and reliable equipment solutions. The external gear ball and roller combination bearing developed by LTZC for Zoomlion Heavy Industry is specifically designed to meet the needs of stacker-reclaimers under extreme working conditions, optimizing the bearing structure and improving the service life of the slewing bearing.

II. Technical Parameters and Design Features of the Ball and Roller Combined Bearing

This external gear ball and roller combined slewing bearing, model 121.36.4750.03, has the following key technical parameters:

Outer ring diameter: Ф5000.4mm

Inner ring diameter: Ф4300.6mm

bearing type: External gear ball and roller combined structure

Load capacity: High load capacity, suitable for the demanding requirements of stacker-reclaimers operating under heavy load and high-frequency conditions.

Operating temperature: Can withstand extreme operating environments, suitable for industrial sites with high temperatures and high humidity.

Material: 42CrMo, processed with high-precision machining and heat treatment processes, possessing excellent wear resistance and durability.

Lubrication method: Complex lithium-based extreme pressure grease, lubrication is achieved by injecting grease through the grease injection hole.

Accuracy class: P5 standard

The design of this external gear ball and roller combined bearing takes into account the extremely high demands placed on bearings by stacker-reclaimers operating at high speeds and under heavy loads. The external gear design of the bearing not only improves overall transmission efficiency but also greatly enhances its load-bearing capacity, allowing the equipment to maintain efficient and stable operation even in harsh environments.

III. LTZC Bearing Solutions

In the development of this bearing, LTZC combined over 20 years of technological expertise and extensive practical application experience, employing advanced design concepts and manufacturing technologies. The specific solutions are reflected in the following aspects:

Customized Design:

Through close communication with the customer, LTZC conducted precise measurements of the old slewing ring, collected data, and analyzed equipment operating conditions and requirements, ensuring that the customized slewing bearing could meet the needs of the stacker-reclaimer to the greatest extent, providing higher reliability and a longer service life.

High Load Capacity and High Precision:

LTZC's bearings, through precise design and advanced manufacturing processes, provide excellent load capacity and stability. Its external gear ball-roller combination structure effectively distributes the load, allowing the bearing to maintain stable performance even under heavy loads and high-speed operation.

Durability and Corrosion Resistance:

The bearing uses high-quality bearing steel, undergoes rigorous heat treatment processes, and has a galvanized surface treatment, possessing excellent wear resistance and corrosion resistance, enabling stable operation for extended periods under complex working conditions. This characteristic is particularly important in environments such as mines and ports, effectively reducing equipment failures and lowering maintenance costs.

Optimized Lubrication and Cooling System:

Due to the significant temperature variations faced by the stacker-reclaimer during operation, LTZC designed an optimized lubrication and cooling system for this bearing. This ensures that the bearing can maintain smooth operation even in high-temperature, high-humidity, and dusty environments, preventing failures caused by insufficient lubrication or overheating.

Efficient Production and Delivery:

LTZC, with its advanced production equipment and mature manufacturing processes, ensures the efficient completion of the bearing from design to delivery. Under strict quality control, every bearing is guaranteed to meet customer requirements and be delivered on time.

Get LTZC bearing solutions

IV. Advantages of LTZC Bearings and Customer Trust

With years of deep accumulation and technological innovation in the field of large bearings, LTZC is committed to providing customers with high-quality, customized bearing solutions. The following are some of LTZC's core advantages:

Leading Technological Strength:

LTZC has an experienced R&D team and collaborates with top domestic and international research institutions to continuously promote technological innovation. The company's externally geared ball and roller combination bearings are at the forefront of the industry in both design and manufacturing processes.

Strong Manufacturing Capabilities:

LTZC is equipped with world-class manufacturing equipment and precision machining technology, enabling it to manufacture large, precision bearings that meet various customer needs. The company strictly controls every production stage of the bearings, ensuring that every parameter of the product meets international standards.

Efficient Customer Service:

LTZC focuses on customer needs and feedback, providing customized technical support and after-sales service. Whether it's bearing design, selection, production, or subsequent installation and maintenance, LTZC provides comprehensive technical support to ensure that customers' equipment is put into use in the shortest possible time.

Strict Quality Management:

LTZC has a comprehensive quality management system, strictly adhering to international standards in every aspect, from raw material procurement and production process control to final quality inspection. Through international certifications such as ISO 9001 ISO14001 ABS BV, LTZC's product quality has gained widespread recognition from global customers.