Installation steps and precautions for four-point contact ball slewing ring

What is four-point contact ball slewing ring

Four-point contact ball slewing ring is a key component widely used in all kinds of large-scale machinery and equipment, mainly composed of inner ring, outer ring, steel ball and retaining frame. The inner and outer rings are processed by a special process to fit the raceway, and the high-precision steel balls are evenly distributed in it, and the cage ensures that the steel balls are arranged in an orderly manner. When working, with its unique four-point contact method, it can efficiently and evenly distribute the axial force, radial force and overturning moment to achieve smooth rotation. This kind of slewing ring is known for its high load, high precision, compact structure and good interchangeability, and is widely used in cranes, excavators, loading and unloading equipment in port machinery, as well as wind power generation, medical imaging equipment and other industries, providing a solid guarantee for the stable operation and precise rotation of equipment.

Features of four-point contact ball slewing rings

Strong bearing capacity: It can withstand large axial force, radial force and overturning moment at the same time, which can meet the needs of various heavy-duty working conditions, and is suitable for large construction machinery such as cranes and excavators.

High rotation accuracy: the matching accuracy between the steel ball and the raceway is high, and the operation is stable, which can ensure the accuracy of the equipment in the rotation process, which is conducive to improving the machining accuracy and work efficiency, and is often used in the equipment with high requirements for rotation accuracy, such as the rotary workbench of precision machine tools.

Compact structure: Compared with other types of slewing rings, its structure is relatively simple and compact, occupies little space, is easy to install and maintain, and has obvious advantages in equipment with limited space, such as the joint parts of small robots.

Low friction resistance: rolling friction replaces sliding friction, and the friction coefficient is small, which can reduce energy loss, improve the transmission efficiency of equipment, and reduce power consumption.

Long life: Using high-quality materials and advanced processing technology, the raceway and steel ball have good wear resistance and fatigue resistance, and can run stably for a long time under normal use conditions, reducing the maintenance cost and downtime of the equipment.

Easy installation: high degree of standardization, relatively fixed installation size and connection mode, simple installation process, can effectively shorten the installation and commissioning cycle of equipment.

Good adaptability: According to different working conditions and load requirements, targeted design and selection can be carried out, such as selecting different materials, specifications, accuracy grades, etc., to adapt to various complex working environments and working conditions.

Installation steps and precautions for four-point contact ball slewing ring

Installation Steps

Preparation: Check the flatness, verticality and roughness of the mounting surface to ensure that it meets the design requirements. Clean the surface of the mounting surface and slewing ring to remove oil, burrs and debris. Prepare the tools needed for installation, such as wrenches, jacks, dowel pins, etc.

Positioning and pre-assembly: Lift the slewing ring above the installation position and slowly lower it using a jack or other auxiliary tool so that it is roughly aligned with the installation position. The slewing ring is preliminarily fixed with the mounting surface by means of dowel pins or temporary fixing bolts to ensure that its position is accurate.

Installation bolts: Insert bolts into the bolt holes of the slewing ring according to the design requirements and tighten them gently. Note that the bolts should be evenly distributed and not tightened all at once, so that the position can be fine-tuned during subsequent adjustments.

Adjustment and calibration: Use measuring tools, such as spirit level, dial gauge, etc., to measure and adjust the levelness, verticality and concentricity of the slewing ring. By fine-tuning the tightness of the bolt, the slewing ring can meet the requirements of the designed installation accuracy. In the process of adjustment, it is necessary to repeatedly measure and adjust to ensure that all indicators meet the standards.

Final tightening: After confirming that the position and accuracy of the slewing ring are adjusted in place, the bolt is finally tightened with a torque wrench according to the specified torque value. In the fastening process, the bolts should be tightened symmetrically in a certain order to ensure that the slewing bearing is evenly stressed.

Installation accessories: According to the requirements of the equipment, install the accessories of the slewing ring, such as sealing devices, lubrication systems, protective devices, etc. Make sure these accessories are securely installed, well sealed, and working properly.

Precautions

Installation environment: The installation process should be carried out in a clean and dry environment, and avoid installation in places with sand, humidity or corrosive gases. At the same time, it is necessary to ensure that there is enough space and suitable lifting equipment at the installation site for smooth installation operations.

Installation accuracy: The installation accuracy of the four-point contact ball slewing ring directly affects its service life and performance, so it must be installed in strict accordance with the design requirements. During the installation process, accurate measurement tools should be used to carefully measure and adjust the installation indicators to ensure that the errors such as horizontality, verticality and concentricity are controlled within the allowable range.

Bolt installation: Select the right bolt and ensure that its material, specification and length meet the design requirements. When installing bolts, it is necessary to pay attention to the tightening sequence and torque value of the bolts to avoid uneven bearing capacity of the slewing ring due to uneven tightening of the bolts. At the same time, it is necessary to check the tightening of the bolts regularly to prevent the bolts from loosening.

Lubrication and sealing: The lubrication and sealing of slewing rings are very important, and good lubrication can reduce wear and extend service life; An effective seal prevents dust, moisture and impurities from entering the inside of the slewing ring and affecting its performance. When installing, make sure that the lubrication system is unblocked, the sealing device is installed correctly, and there is no leakage.

Post-installation inspection: After the installation is completed, a comprehensive inspection of the slewing ring is carried out, including visual inspection, bolt tightening inspection, lubrication and sealing inspection, and slewing flexibility inspection. In the trial operation stage of the equipment, the operation of the slewing ring should be closely observed, and if there is any abnormality, it should be stopped in time to check and eliminate the fault.

Four-point contact ball 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 cost-effective slewing rings.Our team of professionals is ready to provide assistance and expertise throughout the process. Whether you are ordering from our standard product range or looking for a tailor-made solution for your current project, they are ready to assist you.