slewing ring manufacturers factory

1.Large heavy-duty ladle slewing ring failure

The ladle slewing bearing is the core component of the ladle casting equipment on the steelmaking production line. It is a large slewing ring. In addition to bearing axial and radial forces, it also bears a large overturning moment during use.

It has large size and low rotational speed (1 ~ 10 t/min), large load, high cost, and difficult maintenance, the design life is generally 8 to 10 years, and its use conditions and life factors directly affect the connection between steelmaking and continuous casting processes.

In the process of use, the actual service life of this type of bearing varies greatly due to different manufacturing levels and working conditions. Taking a large iron and steel group as an example, the actual service life of the ladle slewing bearing of the continuous casting machine with a design life of 8 years is only 4 years at the lowest and 17 years at the longest, showing a large dispersion.

Since there are generally no spare parts for this type of slewing ring, if a failure occurs, it will cause huge downtime losses, so it is very important to predict the operating state of this type of  slewing ring. Through the manufacturing and application experience and the successful experience (-4) in the fault diagnosis of rolling bearing, the wear state of the large and heavy-duty ladle slewing bearing was accurately grasped, and good application results were obtained.
All in all: In the early stage, the large bearing of the ladle appeared to have noise, vibration, clearance and unknown debris. Basically, new bearings should be prepared for replacement at any time within 3 to 6 months.
At the same time, there is a new design of quality documents and drawings for the design, improvement and improvement of the new bearing to ensure that the large ladle bearing can be more stable, reliable and durable.

2.Axial clearance Radial clearance for slewing ring

The determination of axial clearance, radial clearance and inclined clearance and the influence on the slewing ring, in layman’s terms, is the artificial regulation of the bearing clearance, according to the size of the size, the influence of the structure and the setting of the working conditions. In essence, the size of the clearance has no absolute relationship with the quality and stability of the bearing. As a set value in the process, it is only a technical index to measure the bearing.

The clearance of four-point contact ball bearings, crossed roller bearings and three-row ball bearings is directly related to the diameter of the slewing ring. The larger the diameter, the greater the clearance. The function of the clearance is to adjust the rotational flexibility of the bearing. . Too large is easy to wear, too small hinders rotation. The clearance of precision bearings is set according to the requirements of the working conditions.

Measurement of axial clearance The determination of radial clearance and inclined clearance is mainly based on the dial indicator, watch frame, jack, and the average value of three degrees. There is only one degree in the radial direction, and the maximum value of three points is determined. , the inclined clearance mainly investigates the maximum value of a single point and one side.

First of all, it needs to be clear that whether the standard implemented by the slewing bearing is JB/T10471 or the JB/T2300 implemented by the slewing bearing, in fact, to sum up, most of the application occasions of the slewing bearing belong to the heavy field of the heavy industry. Sexual requirements are not high, generally speaking, they are all grade 10 teeth. As for the quenching of the tooth surface, the accuracy level is lost to level 12. From the perspective of the application, it does not affect the meshing. Therefore, emphasizing the high precision of the gear is a fuss and nitpicking. .

Of course, the accuracy of the slewing bearing is generally obtained by grinding the teeth. Several key data of measuring gear are as follows,

Common normal length, common normal deviation, tooth jump, fixed chord tooth height and tooth thickness, as for tooth shape, tooth direction and tooth pitch, you need to use professional instruments to measure.

Regarding gear accuracy measurement, we can currently measure items such as common normal dimensional tolerance, common normal variation deviation, fixed chord tooth height and tooth thickness. For other gear accuracy requirements, such as tooth shape, tooth direction, tooth pitch, etc., currently unconditional measurement. In the case of grinding teeth, it is generally within a reasonable range.