RU2117922C1 - Device for measuring of bearing vibration level - Google Patents

Abstract

FIELD: measurement technology. SUBSTANCE: device has electric motor with drive shaft. Motor includes core with three-phase winding. One end of shaft carries bearing set on bushing. Sensing element is positioned on outer race of bearing. Other end of shaft is arranged in bearing of motor end shield. Motor rotor is provided with squirrel-cage winding. Plain bearing located in massive housing secured by bolts on second end shield of motor serves as second support of common shaft. Housing is provided with mechanical clamp which includes platform and adjusting nut. EFFECT: improved diagnostics of antifriction bearings. 2 cl, 1 dwg

Description

The invention relates to testing equipment, and more specifically to devices for measuring the vibration level of rolling bearings
A device for measuring the vibration level of bearings is known, comprising a drive shaft and a vibration sensor (ed. St. USSR N 1286923, class G 01 M, 1987).

 This device does not provide sufficient accuracy for measuring vibration of bearings.

 The closest in its technical essence to the claimed is a device for measuring vibration of bearings according to St. USSR N 1/10, class G 01, N 305367, 1971, comprising a drive shaft on which the inner ring of the test bearing is mounted, and a vibration sensor mounted on the outer ring of the test bearing. This device is adopted as a prototype.

 This device does not provide sufficient accuracy for measuring vibration of bearings. This is a disadvantage of the prototype.

 The aim of the present invention is to eliminate the noted drawback in the developed device design.

 This goal is achieved by the fact that in a device for measuring vibration of bearings containing a drive with a drive shaft on which an inner ring is mounted, and a vibration sensor mounted on the outer ring of the test bearing, according to the invention, the device is equipped with vibration measuring equipment, a rolling bearing and a sliding bearing located in the housing , an induction motor with bearing shields was used as a drive, in one of which a rolling bearing was installed, and in the other bearing shield those fixed to the plain bearing body, wherein the drive shaft is housed in the inner ring of the rolling bearing and a sliding bearing, the sliding bearing housing is provided with a mechanical clamp for fixing the outer ring of the test bearing. Alternatively, the mechanical clamp for fixing the outer ring of the test bearing is made screw.

 Supply of the device with vibration measuring equipment, a rolling bearing and a sliding bearing located in the housing, using an asynchronous electric motor with bearing shields, in one of which a rolling bearing is installed, and in the other bearing shield a sliding bearing housing is fixed, the drive shaft is placed in the inner ring of the bearing rolling element and in a sliding bearing, supplying the rolling bearing housing with a mechanical clamp for fixing the outer ring of the bearing being tested, mechanical screw clamping - these technical features determine the novelty of the developed device.

 The invention is illustrated by an example of its specific implementation with reference to the accompanying drawing, which shows the proposed device, a longitudinal section.

 A device for measuring the vibration level of bearings (Fig. 1), comprising a drive 1 with a drive shaft 2. The drive 1 is made in the form of an induction motor including a stator 3 with a three-phase winding 4. On the drive shaft 2 there is an inner ring of the test bearing 5 mounted on the sleeve 6. On the outer ring of the bearing 5 is mounted a vibration sensor 7, for example, a piezoelectric connected with vibration measuring equipment (not shown). The rolling bearing 8 is located in one bearing shield 9 of an induction motor. The rotor 10 of the induction motor (drive 1) is squirrel-cage and contains a squirrel cage type winding. A sliding bearing 11 is attached to another bearing shield, the housing 12 of which is bolted 13 to a bearing shield. The rolling bearing housing is equipped with a mechanical threaded clamp 14 containing a pressure plate 15 and an adjusting nut 16 for fixing the outer ring of the bearing being tested.

 The device operates as follows.

 When connected to a source of three-phase voltage of the stator winding 4, a rotating magnetic field is created that intersects the short-circuited winding of the rotor 10 and induces currents in it. These currents, when interacting with a rotating magnetic field, create a moment under the action of which the rotor 10, mounted on the drive shaft 2, begins to rotate. In this case, the inner ring of the test bearing 5 will rotate, the outer ring of which is fixed with a mechanical clamp. The vibration of the bearing 5 is measured using a sensor 7, the output of which is connected to vibration measuring equipment.

 The design of the device does not include a second rolling bearing in the drive induction motor, the presence of which imposes an additional error on the measured value of vibration, and a massive plain bearing is used as the second support, which improves the accuracy of vibration measurement and eliminates the possibility of error in the diagnosis of bearings.

Claims (2)

 1. A device for measuring the vibration level of bearings, comprising a drive shaft on which the inner ring of the test bearing is mounted, and a vibration sensor mounted on the outer ring of the test bearing, characterized in that it is equipped with vibration measuring equipment, a rolling bearing and a sliding bearing located in the housing, As the drive, an asynchronous electric motor with bearing shields was used, in one of which a rolling bearing was installed, and in the other bearing shield a housing was fixed sliding bearings, wherein the drive shaft is housed in the inner ring of the rolling bearing and a sliding bearing, the sliding bearing housing is provided with a mechanical clamp for fixing the outer ring of the test bearing.  2. The device according to claim 1, characterized in that the mechanical clamp is made screw.