SU1002873A1 - Method and device for determination of rolling bearing serviceability - Google Patents

Description

The invention relates to measuring equipment and can be used in all branches of engineering for monitoring the condition of bearings in assemblies.

Known method for determining rabo- ⁵ petitiveness rolling bearings, za-. which means that the bearings mounted on the same shaft and in the general housing of the assembly are rotated, the parameters of the electrical signal between the housing and the shaft are measured, which determine the operability of: bearings [1]. .

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A device is also known for determining the operability of rolling bearings, for example, by the value of the integral contact time of its parts, containing a pulse shaper and a discrete counting element connected in series, a voltage source connected to the first input of the pulse shaper, and a current collector connected to its second input f2 J.

However, the known method does not allow precise control of the bearing ΈΓ of the assembly, since the latter usually has at least two bearings mounted on one shaft and in a common metal housing, i.e. the inner rings of the bearings through the shaft> and the outer ones through the housing of the assembly are galvanically connected to each other. In this regard, a device connected to the rings of one of the bearings determines a certain total contact time of the parts of all bearings in the assembly.

The aim of the invention is to determine the operability of each of several bearings mounted: on one shaft and in the general housing of the assembly. -.

This goal is achieved by the fact that; In accordance with the method for determining the working properties of rolling bearings, additionally measure the parameters of the electrical signal between the points of the housing at the locations of the bearings, which are taken into account when determining the performance of bearings.

The device for determining the operability of rolling bearings is equipped with two resistors connected between the voltage source and the outer rings of the bearings, the separator is a 1 nm block connected to the inputs to the outer rings of the bearings, the additional connected by the smoke of which are pulse breakers, and the outputs are with a discrete counting element.

1002873 4

The pulse shaper has two stable states. When the value of the input voltage of a given level is reached, an output voltage is generated corresponding to a logical unit, in another case, the output voltage corresponds to a logical zero. The voltage pulse after the shaper 10 is fed to the input of the adder 12.

At the moment of contacting the parts of the bearing 2 on the housing 4 of the node there is a similar voltage pulse, only of the opposite polarity, which is divided by the separation unit 9 to the pulse shaper 11, and then to the adder 13.

At the moment of contacting the parts of both bearings, the current in the circuit of the voltage source 6 reaches a value sufficient to operate the pulse shaper 5, the output of which is connected to the inputs of the adders 12 and 13.

Adders perform the function of logical addition. The total duration of the pulses at the outputs of the adders 12 and 13, respectively equal to the integral contact time of the parts of the bearings 1 and 2, is measured by a discrete counting element 14. The period of the filling pulses of the generator 15 is selected by an order of magnitude shorter than the duration of the shortest contact pulses.

The invention makes it possible to continuously monitor the operability of bearings operating in real mechanisms of machines and devices, to continuously monitor the state of each bearing individually and to prevent the failure of the entire mechanism.

pulse shapers, inputs with the outputs of the unlocking unit, and adders, connected to the outputs of the shaper. The drawing shows a block diagram of the proposed device.

A device for determining the health of rolling bearings 1 and 2 installed on one shaft 3 and in a common housing 4, contains a pulse shaper 5, a voltage source 6 and a current collector 7 connected in series, while two resistors 8 are connected between the voltage source 6 and the outer rings of the bearings 1 and 2, and the separation unit 9 is connected to additional pulse shapers 10 and 11, to which adders 12 and 13 are connected, connected to a discrete counting element 14, made in the form of a pulse generator 15, time intervals projectors 16 and 17 and the counters 18 and 19 pulses.

The method is implemented as follows using the proposed device.

At the moment of contacting the details of one of the bearings, for example, bearing 1, its electrical resistance decreases sharply, and the current through it, 'accordingly, increases. ⁴⁵ Due to the presence of two resistors 8, part of this current passes through the housing 4 in the direction from the bearing 1 to the bearing 2. The voltage pulse or the amplitude of the harmonic components ^{50 of the} electric voltage between the points of the housing 4 at the locations of bearings 1 and 2 is perceived by the separation unit 9, which depending on the polarity of the signal directs it to the input of one of the pulse shapers, for example shaper 10.

Claims (2)

(St) METHOD FOR DETERMINING WORKING CAPACITY. Rolling equipment and device The invention relates to a measuring technique and can be used in all fields of mechanical engineering to monitor the condition of the bearings in the assemblies. A known method for determining the performance of rolling bearings, is that bearings rotated on one shaft and in a common housing of an assembly are rotated, and electrical signal parameters are measured between the housing and the shaft, which determine the performance of the bearings t 4 ,. TT is also known device for determining the performance of rolling bearings, for example, by the integral time of contacting its parts, containing sequentially connected driver and "1 pulses and discrete element of the voltage source connected to the first input of the pulse generator ITS IMPLEMENTATION, and the current collector connected to it the second input 1 J.. : Od; however, a known method does not allow precise control of pd; ; I t ip assembly yiahe, so kai: °%. the latter is usually at least two bearings mounted on the same shaft and in a common metal case, i.e. the inner rings of the bearings through the shaft and the outer ones through the assembly body are galvanically connected with each other. In this connection, a device connected to the rings of one m3 bearing NIKOV determines a total amount of contact time for all parts; bearings in the assembly. The purpose of the invention is to determine the operability of each of several bearings, installed on the same shaft and in the general body of the subassembly. This goal is achieved by the fact that. According to the method of determining the rolling bearing bearing strengths, the electrical signal parameters between the points of the housing at the bearing locations, which are taken into account when determining the performance of the bearings, are additionally measured. A device for determining the performance of rolling bearings is provided with two resistors connected between a voltage source and outer bearing rings, a separation unit connected by inputs to the external bearing rings, additional pulse conditioners connected inputs to the separation section outputs, and adders whose inputs are connected to the outputs pulse formers, and outputs - with a discrete counting element. The drawing shows a block diagram of the proposed device. A device for determining the operability of rolling bearings 1 and 2 mounted on one shaft 3 and in a common case k contains in series a pulse shaper 5, a voltage source 6 and a current collector 7, with two resistors 8 connected between the voltage source 6 and the outer rings bearings 1 and 2, and the separation unit 9 is connected to additional formers 10 and 11 pulses, to which adders 12 and 13 are connected, connected to the discrete counting element lU, made in the form of a generator 15 pulses. x selectors 16 and 17 and also counters 18 and 19 pulses. The method is implemented as follows using the proposed device. At the moment of contact of parts of one of the bearings, for example bearing 1, its electrical resistance decreases sharply, and the current through it, respectively, increases. Due to the presence of two resistors 8, a part of this current passes through the housing in the direction from bearing 1 to bearing 2. The voltage pulse or amplitude of the harmonic components of the electrical voltage between points of the housing k at the locations of the bearings 1 and 2 is sensed by the separation unit 9, which depending on the polarity of the signal, it directs it to the input of one of the pulse shapers, for example, shaper 10. 8734 The pulse shaper has two stable states. When the input voltage reaches a predetermined level, an output voltage is formed at the output corresponding to a logical unit; in another case, the output voltage corresponds to a logical zero. The voltage pulse after the former 10 is fed to the input of the adder 12. At the moment of contact of the bearing 2 parts, a similar voltage pulse of only opposite polarity arises on the assembly housing k, which is sent by the separation unit 9 to the pulse former 11, and then to the adder 13 At the moment of contacting the parts of both bearings, the current in the circuit of the voltage source 6 reaches a value sufficient to trigger the imager 5 pulses, the output of which is connected to the inputs of the adders 12 and 13. ln logical addition function. The total duration of the pulses at the outputs of the adders 12 and 13 is equal, respectively, to the integral time of contacting the parts of the bearings 1 and 2, measured by the element I of the discrete count. The period of the filling pulses of the generator 15 is selected by an order of magnitude shorter than the duration of the shortest contact pulses. The invention allows continuous monitoring of the performance of bearings, working in real mechanisms of machines and devices, continuously monitoring the condition of each bearing individually and preventing the outflow from the entire mechanism. Claim 1. Method for determining the performance of rolling bearings, which consists in rotating bearings mounted on one shaft and in a common housing assembly, measure electrical signal parameters between the housing and the shaft, which determine the performance of the bearings, differing from that, in order to determine the operability of each of several bearings, the electrical signal parameters are additionally measured between the points of the housing in the installation of the bearings, which take into account and the determination of bearing performance. 2. A device for determining the performance of rolling bearings, containing a pulse generator connected in series and a discrete counting element, a source of pressure, connected to the first input of the pulse former, and a current collector connected to its second input, which is equipped with resistors connected between the voltage source and the outer rings of the bearings, the separation unit connected by the inputs to the outer rings of the bearings, additional pulse shapers, -bound inputs to the outputs of the separating unit, and an adder whose inputs are connected to outputs of pulse shaping, and outputs - a discrete calculation element. Sources of information taken into account in the 1 & expertise 1. USSR author's certificate If, cl. Q01 M 13/01, 1976 (prototype). 2 USSR certificate of authorship of the USSR If 671 No. 9; cl. G 01 M 13M, 1976 (prototype).