What installation factors need to be considered when choosing a cross cylindrical roller slewing ring?

What is cross cylindrical roller slewing ring

The cross cylindrical roller slewing ring is a key mechanical component, which is composed of two high-precision raceways perpendicular to each other, and the cylindrical rollers in the raceway are arranged in a cross and are equipped with wear-resistant isolation blocks to prevent roller collision and wear. With this structure, it can bear large axial force, radial force and overturning moment at the same time, and the rollers roll in the raceway to achieve smooth rotation of the two parts during work, which is widely used in industrial robot joints, machine tool slewing workbenches, port crane slewing mechanisms and other equipment with strict requirements for rotary accuracy and bearing capacity, so as to ensure the stable and efficient operation of the equipment.

Features of cross cylindrical roller slewing rings

Cross cylindrical roller slewing rings have the following characteristics:

High load-bearing capacity: Its unique structural design, cylindrical rollers are cross-arranged in the raceway, which can withstand large axial force, radial force and overturning moment at the same time. This allows it to be applied to large machinery and equipment, such as large cranes, port handling equipment, etc., which can stably support huge weights and complex loads.

High-precision rotation: the machining accuracy of the raceway and roller is high, which can ensure the high precision of the slewing ring in the process of operation. For example, in the rotary table of precision machine tools, the use of cross cylindrical roller slewing rings can achieve precise angular positioning and stable rotary motion, thus improving machining accuracy.

Good rigidity: It has good rigidity and can reduce deformation during bearing and operation. In the joint part of the industrial robot, due to the need for precise motion control and high rigidity support, the cross cylindrical roller slewing bearing can ensure the stability and accuracy of the robot arm during the movement, and improve the work efficiency and quality of the robot.

High reliability: The use of high-quality materials and advanced manufacturing technology makes the slewing ring have high wear resistance, corrosion resistance and fatigue resistance. In the yaw system of wind turbines, cross cylindrical roller slewing bearings need to work in harsh outdoor environments for a long time, and their high reliability can ensure the stable operation of wind turbines and reduce maintenance costs and downtime.

Compact structure: The structure is relatively compact, and its overall dimensions are smaller than other types of slewing rings under the same load-bearing capacity. This is important for equipment where space is limited, such as in the rotary table of some small automated production lines, where cross cylindrical roller slewing rings can provide reliable slewing support in a limited space.

What installation factors need to be considered when choosing a cross cylindrical roller slewing ring?

When selecting a cross cylindrical roller slewing ring, the following installation factors need to be considered:

Installation space

Size matching: The external dimensions of the slewing ring, including the outer diameter, inner diameter, width, etc., need to be adapted to the space of the installation site. For example, in small equipment where space is tight, slewing rings with a small form factor should be selected to avoid installation or interference with other components.

Installation method: According to the characteristics of the installation space, determine the appropriate installation method. Common installation methods are bolting, welding, etc. If the installation space restricts the arrangement of bolts, other installation methods such as welding need to be considered, but pay attention to the impact of welding on the accuracy and performance of slewing rings.

Load characteristics

Axial load: The axial force that the slewing ring needs to bear is an important basis for selection. For example, in the slewing mechanism of the tower crane, because the self-weight and lifting weight of the boom will produce a large axial load, it is necessary to select a cross cylindrical roller slewing ring that can withstand the corresponding axial force to ensure the stable operation of the crane.

Radial load: The radial force generated during the operation of the equipment also needs to be borne by the slewing bearing. For example, in the joint part of the industrial robot, due to the movement and load of the arm, the radial load will be generated on the slewing bearing, and the slewing bearing with appropriate bearing capacity should be selected according to the specific load size to ensure the movement accuracy and stability of the robot joint.

Overturning moment: When there is a large eccentric load or external force acting on the equipment, the overturning moment will be generated. For example, in the port loading and unloading equipment, due to the eccentric hoisting of the goods, the slewing ring will bear a large overturning moment, and the slewing ring with sufficient anti-overturning ability needs to be selected to prevent the equipment from tipping accident.

RPM requirements

Working speed: The working speed of the slewing ring directly affects its performance such as heating, wear and lubrication. For high-speed rotating equipment, such as the yaw system of wind turbines, it is necessary to select a slewing ring that can adapt to higher speeds, and be equipped with corresponding lubrication and cooling devices to ensure its reliability and life at high speeds.

Start and stop frequency: The equipment that starts and stops frequently will produce a large impact load on the slewing ring. For example, in the rotary table of an automated production line, if there are frequent starts and stops, it is necessary to choose a slewing ring with good impact resistance to reduce the impact of impact on bearing life.

Accuracy requirements

Rotation accuracy: For some equipment with high requirements for rotation accuracy, such as the workbench of precision machine tools, antenna turntables in the aerospace field, etc., it is necessary to choose high-precision cross cylindrical roller slewing rings to ensure the machining accuracy or working performance of the equipment.

Installation accuracy: When installing slewing rings, it is necessary to ensure the flatness and verticality of the installation surface and the position accuracy of the bolt holes. For example, when installing the slewing ring of a large rotary kiln, if the flatness error of the installation surface is too large, it will lead to uneven bearing capacity of the slewing ring, affecting its service life and the normal operation of the equipment.

Lubrication and sealing

Lubrication method: According to the working environment and speed of the slewing ring, choose the appropriate lubrication method. Common lubrication methods are grease lubrication and oil lubrication. In high-temperature, high-speed, or dusty environments, oil lubrication may be more suitable because it has better heat dissipation and cleaning properties; In some low-speed, light-load and high-sealing occasions where good sealing performance is required, grease lubrication is more commonly used.

Sealing form: A good seal is the key to prevent grease leakage and external impurities from entering the slewing ring. According to the different working environment, different forms of sealing devices such as lip seal and labyrinth seal can be selected. For example, in harsh environments such as mining machinery, labyrinth seals with good sealing performance should be selected to extend the service life of slewing rings.

Cross cylindrical roller slewing ring supplier

As a well-known supplier of slewing rings with 30 years of experience, LTZC Bearings is committed to providing high-quality and low-cost slewing rings. The specific price needs to be comprehensively evaluated according to the size, load, material and accuracy requirements of the bearing. Please contact us if you need it.