Method of installation and maintenance of cross cylindrical roller slewing rings

What is cross cylindrical roller slewing ring

Cross cylindrical roller slewing ring is a kind of slewing bearing device, composed of two seat rings, using a cylindrical roller structure arranged in a cross arrangement, the rollers are separated and positioned by isolation blocks, which can bear axial force, radial force and overturning moment at the same time, has a high bearing capacity and slewing accuracy, and is often used in hoisting machinery, construction machinery, port machinery and some equipment and machinery that require high-precision and high-load slewing movement, so as to realize the stable connection and flexible rotation between the relative slewing moving parts.

Features of cross cylindrical roller slewing rings

High load-bearing capacity: The cylindrical roller structure with cross arrangement is adopted, and the rollers are in linear contact with the raceway, which can withstand greater axial force, radial force and overturning moment than the point-contact structure, which can meet the needs of heavy equipment and high-load conditions.

High precision: the precise arrangement of the rollers and the positioning of the isolation block make the slewing ring maintain a high rotation accuracy during operation, effectively reduce the shaking and deviation during operation, and can meet some equipment with high requirements for motion accuracy, such as precision machine tools, radar antenna bases, etc.

Compact structure: The structural design of this slewing ring is more compact, occupies less space, and has more advantages in the space layout of the equipment, which is conducive to the miniaturization and lightweight design of the equipment, especially suitable for occasions with limited space but high bearing capacity.

Easy installation: its structural form makes the installation process relatively simple, generally only need to connect the two seat rings with the fixed parts and rotating parts of the equipment respectively through bolts, which can effectively shorten the assembly time of the equipment and improve the production efficiency.

High rigidity: Due to the reasonable arrangement of the rollers and the design of the seat ring, the whole has high rigidity, and the deformation is small when bearing the load, which can ensure the stability of the equipment during operation and prolong the service life of the equipment.

Good interchangeability: The standardized design and manufacture make the cross cylindrical roller slewing ring have good interchangeability, when a component is damaged, it is easy to replace the corresponding part, reducing the maintenance cost and downtime of the equipment.

Wear resistance: The selection of high-quality materials and advanced heat treatment technology makes the roller and raceway surface have high hardness and wear resistance, which can maintain good performance in long-term operation and reduce the impact of wear.

Strong adaptability: It can adapt to different working environments and working conditions, whether it is in high temperature, low temperature, humid or dusty and other harsh environments, as long as appropriate protective measures are taken, it can work reliably and has strong environmental adaptability.

Method of installation and maintenance of cross cylindrical roller slewing rings

The installation and maintenance methods of cross cylindrical roller slewing rings are as follows:

Installation method:

Preparation before installation

Clean parts: thoroughly clean the slewing ring, shaft, bearing seat and other related parts to remove processing burrs, iron filings, oil stains and other impurities, and prevent impurities from entering the slewing ring and affecting its performance and service life.

Inspection parts: Carefully inspect the components of the slewing ring, including the inner ring, outer ring, rollers, cages, etc., to ensure that there are no cracks, damage, rust and other defects, and the dimensional accuracy meets the requirements. At the same time, check the size, shape accuracy and surface roughness of the shaft and bearing seat to ensure the matching accuracy of the slewing ring.

Prepare the tools: Prepare the tools required for installation, such as special installation fixtures, hydraulic jacks, heating equipment, gages, etc., to ensure that the tools are complete and in good condition.

Installation process

Determine the installation position: According to the design requirements of the equipment, accurately determine the installation position of the slewing ring on the basis of installation, and draw the installation baseline to ensure the accuracy of the installation position.

Installation of slewing rings: For large cross cylindrical roller slewing rings, the installation is usually carried out by the hot or cold installation method. When hot charging, the inner or outer ring of the slewing ring is evenly heated to a certain temperature (generally not more than 120°C), so that it can be expanded and then fitted to the shaft or bearing seat; Cold installation is the use of a special press-in tool, the slewing ring is slowly and evenly pressed into the installation position at room temperature. During the installation process, it is necessary to pay attention to maintaining the levelness and verticality of the slewing ring, and use tools such as spirit level and dial gauge to measure and adjust to ensure that the installation accuracy meets the requirements.

Install the connecting parts: After the slewing ring is installed in place, install the connecting bolts, nuts and other components. When tightening the bolts, it is necessary to operate in accordance with the specified torque and sequence to ensure that the bolt tightening force is uniform, so as to avoid the uneven bearing force of the slewing ring due to the uneven tightening force of the bolt, which affects its normal operation.

Install the sealing device: Correctly install the sealing device, such as the sealing ring, the sealing gasket, etc., to ensure reliable sealing and prevent lubricating oil leakage and external impurities from entering the inside of the slewing ring. When installing the seal, care should be taken to avoid the seal being scratched or twisted, and ensure that it is installed in the correct position.

Check after installation

Visual inspection: check whether the installation position of the slewing ring is correct, whether the connecting parts are tightened, whether the sealing device is installed in place, and whether there is any looseness, deformation or damage.

Clearance check: Use a feeler gauge or a dedicated clearance gauge to check the radial and axial clearance of the slewing ring to ensure that the clearance is within the specified range. If the clearance does not meet the requirements, it needs to be adjusted or reinstalled.

Rotational flexibility check: manually rotate the slewing ring to check whether its rotation is flexible, and whether there is stagnation, astringency or abnormal resistance. If there is an abnormality, the cause should be found and dealt with in time.

Maintenance Methods

Lubrication maintenance

Choose the right lubricant: Choose the right lubricant according to the working conditions, load size, speed and other factors of the slewing ring. Generally speaking, for high-speed, light-load slewing rings, lubricating oil with lower viscosity can be selected; For low-speed, heavy-duty slewing rings, a higher viscosity oil or grease should be used.

Add and replace lubricant regularly: Lubricate the slewing ring regularly according to the instruction manual and maintenance requirements of the equipment. When adding or changing lubricants, ensure that the lubricant is clean and avoid contamination. At the same time, it is necessary to pay attention to the use of lubricant, and replace or replenish the lubricant in time if it is found that the oil quality is poor and the oil quantity is insufficient.

Clean the lubrication system: Regularly clean the lubrication system of the slewing ring, including the grease nozzle, oil pipe, oil cup and other components to prevent clogging and leakage. If the lubrication system is found to be faulty, the relevant parts should be repaired or replaced in time.

Seal maintenance

Check the seals: Regularly check the seals of the slewing ring, such as the sealing ring, the gasket, etc., to see if they are worn, aged, deformed or damaged. If there is damage, the seal should be replaced in time to ensure the sealing effect.

Clean the sealing part: keep the sealing part clean, clean up the oil, dust and impurities on the sealing surface in time to prevent these impurities from entering the slewing ring and affecting the sealing performance.

Prevent seal aging: Avoid long-term exposure of seals to high temperatures, humidity or corrosive media to prolong the life of seals. If the equipment is shut down for a long time, the condition of the seals should be checked before starting again and, if necessary, replaced.

Regular inspection and maintenance

Visual inspection: Regularly check the appearance of the slewing ring, and check whether the raceway, rollers, cages and other components have wear, fatigue spalling, cracks, corrosion and other phenomena. If a problem is found, appropriate measures should be taken in a timely manner, such as repairing or replacing damaged parts.

Clearance inspection: Regularly measure the clearance of the slewing ring, if it is found that the clearance increases or decreases beyond the specified range, the cause should be analyzed and adjusted. Excessive clearance may lead to the reduction of equipment operation accuracy and increase vibration; If the clearance is too small, it may cause problems such as heating and aggravated wear of the bearing.

Inspection of connecting parts: check whether the connecting bolts, nuts and other components of the slewing ring are loose, and if they are loose, they should be tightened in time. At the same time, check the connecting parts for damage or fatigue and replace them if necessary.

Equipment operation status monitoring: During the operation of the equipment, pay close attention to the operation status of the slewing ring, such as temperature, noise, vibration, etc. If it is found that the temperature of the slewing ring is too high, the noise is abnormal or the vibration increases, it should be stopped in time for inspection, find out the cause and deal with it, so as to avoid the further expansion of the fault.

Cross cylindrical roller slewing ring supplier

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