Method for acquiring load distribution state of multi-row roller turntable bearing in real time

Abstract

The invention discloses a method for acquiring the load distribution state of a multi-row roller turntable bearing in real time. The method comprises the following steps: firstly, uniformly distributing a plurality of ultrasonic test sites on the axial end surface of an outer ring along the circumferential direction; establishing a coordinate system by taking the circle center of the axial end face as an original point, and acquiring coordinates P1 (x1, y1, 0), P2 (x2, y2, 0)... Pn (xn, yn, 0) of each test site; then, ultrasonic waves are synchronously transmitted to the interior of the turntable bearing in the axial direction, the site coordinates Q1 (x1, y1,-l1), Q2 (x2, y2,-l2)... Qn (xn, yn,-ln) of the inner ring are obtained, the site coordinates are fitted, the spatial position relation between the inner ring and the outer ring is obtained, the minimum distance point A and the maximum distance point B between the inner ring raceway reference circle and the plane with z = 0 are calculated through a geometric method, and the maximum distance point A and the maximum distance point B are obtained; and finally, converting the spatial position relationship between the inner ring and the outer ring into a plane position relationship, obtaining an axial deformation distribution diagram of the main thrust roller and the auxiliary thrust roller, and obtaining the load distribution state of the turntable bearing according to the relationship between the load F and the axial deformation delta of the rollers. According to the method, the structure of the turntable bearing is not damaged, the load distribution state of the turntable bearing is obtained in real time, and the accuracy is high.

Description

technical field [0001] The invention relates to the technical field of bearings, in particular to a method for obtaining the load distribution state of a multi-row roller slewing bearing in real time. Background technique [0002] Multi-row roller slewing bearing is a kind of slewing bearing with load characteristics such as low speed, heavy load and strong time variation. Compared with ordinary bearings, multi-row roller slewing bearings have stronger load-carrying capacity, can bear axial force, radial force and overturning moment at the same time, combined with compact structure and superior performance, so the scope of application is expanding day by day. At present, multi-row roller slewing bearings are widely used in roadheaders, cranes and other large-scale construction machinery. The working environment is harsh and the operating conditions are complicated. Once a problem occurs during the construction process, it will cause huge economic losses. Therefore, it is pa...

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Problems solved by technology

However, due to the dynamic change of the load transfer process during the working process, it is difficult to accurately predict the real external load of the bearing only based on the construction information, so there is a large error between the bearing load distribution calculated by this method and the actual situation

[0004] At present, although there are some methods that can realize the real-time measurement of the working state of the slewing bearing, such as using the eddy current displacement sensor to measure the displacement state of the ring, and using the strain gauge to measure the force state of the roller, etc., these methods all need to be carried out on the ring or roller. A certain structural modification to install testing equipment will damage the structure of the slewing bearing itself, and there will be errors between the measured force state and the actual force state of the slewing bearing with a good structure, especially for the turntable working under extreme working conditions For bearings, small structural changes will lead to huge changes in their working conditions, and the confidence in the measurement results is low, which may even cause rapid failure of the bearing structure and cause accidents

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