Måling af spillerummet i gravemaskinens svingleje under montering

Ensuring the precise clearance measurement of excavator slewing bearing during assembly is crucial for the machinery’s optimal performance and longevity. Accurate measurement of axial and radial clearances helps prevent operational issues and extends the bearing’s service life. This blog provides a detailed guide on how to measure these clearances during assembly.

Introduktion

Slewing bearings are essential components in excavators, responsible for the smooth rotation and load distribution of the upper structure. Proper clearance measurement during assembly is critical to ensure the bearing functions correctly and to avoid premature wear or failure. This guide details the steps and considerations for accurately measuring the axial and radial clearances of excavator slewing bearings.

Measurement of Axial Clearance

Axial clearance measurement is the first step in ensuring the proper fit and function of a slewing bearing. Here is a step-by-step process for measuring axial clearance:

Step 1: Uniformly Tighten Connecting Screws

Begin by uniformly tightening the connecting screws of the double half rings in the slewing bearing. This ensures an even fit and prevents any distortion during measurement.

Step 2: Positioning on the Platform

Place the slewing bearing’s datum level on a large, stable platform. Ensure that the bearing is level and stable to obtain accurate measurements.

Step 3: Placement of Adjustable Bearings

Equidistantly place three adjustable bearings from the neutral position of the lower two steps of the slewing bearing. This positioning ensures consistent measurement points.

Step 4: Positioning Measuring Frames

Equidistantly place three measuring frames on the end face of the upper slewing ring. Attach the pointers of these frames to the end face of the lower slewing ring.

Step 5: Measuring Procedure

To measure the axial clearance:

1. Push all three pointers to zero.
2. Adjust the bearings to make the slewing bearing face away from the large platform.
3. The average reading from the three pointers is the axial clearance of the slewing bearing.

This method ensures a precise measurement by averaging the readings from multiple points, thereby accounting for any minor discrepancies.

Measurement of Radial Clearance

Radial clearance measurement is equally important and involves the following steps:

Step 1: Vertical Placement on Platform

Place the slewing bearing vertically on the platform to ensure it is in a stable and consistent position for accurate measurement.

Step 2: Lifting a Slewing Ring

Lift one slewing ring slightly, using the dead weight of the other slewing ring to measure the clearance. This step ensures that the measurement is taken without additional external forces that could distort the reading.

Step 3: Measurement Points

Measure the clearance at three equidistant points along the circumference (every 120°). This approach ensures a comprehensive assessment of the bearing’s radial clearance.

Step 4: Averaging the Measurements

Take the average of the three measurements to determine the radial clearance. Averaging multiple measurements helps mitigate any inconsistencies and provides a more accurate overall clearance.

Konklusion

Accurate measurement of axial and radial clearances during the assembly of excavator slewing bearings is vital for ensuring the longevity and optimal performance of the machinery. By following the detailed steps outlined above, you can achieve precise clearance measurements, thereby preventing operational issues and extending the bearing’s service life.

Q&A Section

Q: Why is it important to measure both axial and radial clearances of slewing bearings?

A: Measuring both axial and radial clearances ensures that the slewing bearing is properly aligned and can handle the loads and movements it will encounter during operation. Proper clearance measurements prevent premature wear and operational failures.

Q: How often should clearance measurements be checked during the life of a slewing bearing?

A: Clearance measurements should be checked during the initial assembly and periodically during maintenance inspections. The frequency depends on the operating conditions and manufacturer recommendations, but generally, it should be done at regular intervals to ensure ongoing optimal performance.

Q: What tools are required for measuring axial and radial clearances?

A: For axial clearance measurement, you need a stable platform, adjustable bearings, measuring frames, and precision pointers. For radial clearance measurement, you need a stable vertical platform and a reliable method to lift and measure the slewing rings accurately.

Q: What are the common signs that indicate a need to re-measure the clearances of excavator slewing bearing?

A: Common signs include unusual noises, increased vibration, uneven rotation speed, and unexpected wear patterns. If any of these signs are observed, it is crucial to re-measure the clearances to diagnose and rectify potential issues.

By following these guidelines and regularly monitoring the clearances, you can ensure the efficient and reliable operation of your excavator’s slewing bearing, thereby enhancing the overall performance and lifespan of your machinery.