CN2155549Y

CN2155549Y - Centring state monitoring device for ratory mechineries

Info

Publication number: CN2155549Y
Application number: CN 92243500
Authority: CN
Inventors: 华永利; 谢锦峰; 顾超华; 李敏; 汪希萱
Original assignee: Zhejiang University ZJU
Current assignee: Zhejiang University ZJU
Priority date: 1992-11-29
Filing date: 1992-11-29
Publication date: 1994-02-09
Anticipated expiration: 2002-11-29

Abstract

The utility model relates to a ' centering state monitoring device for rotary machinery ', which belongs to a centering measuring device. The utility model is a single-rod measuring device formed on the basis of a stress-strain principle, and utilizes a strain type sensor arranged on a measuring rod connected with two machines to display deformation signals of the measuring rod which are obtained during eccentricity. Thus, parallel deviation or angular deviation quantity occurring between shafts of the two machines can be obtained. The utility model can monitor the centering state of the rotary machinery at any time, and has the advantages of low cost and high measuring precision.

Description

Centring state monitoring device for ratory mechineries

The utility model belongs to the centering measurement mechanism, is applicable to the situation of change that monitors centering state in the machine running process.

In the rotary machine of operation at present; produce some vibration faults through regular meeting; the main cause that these faults produce is: 1) rotor unbalance, 2) rotor misalignment, 3) bearing problem; in these three kinds of faults; misalign fault and accounted for significant proportion, will cause catastrophic consequence, cause the tremendous economic loss and excessive centering is overproof in the operational process; so, in actual production, exist dynamic centering and monitor problem.

Disclosing the measurement of DODD rod survey method for United States Patent (USP) NO.3783522 number dynamically misaligns, it is to be fastened on the shaft centre line that measurement rod on the shaft coupling side two machine end faces is represented two machines with two respectively with cantilevered fashion, level and vertical around rod therein, 4 eddy current probe sensors have been arranged respectively, by the variation of eddy current probe according to two rod gap lengths, measure the variation of static relative axle with two machines under dynamic situation center, the variation that is converted into degree of misaligning shows at display.There is following weak point in this mensuration: 1) eddy current probe price height, the ambient temperature effect when being subjected to machine run is big, so also must join a cover cooling system, 2 when using) to measure excellent rigidity little for cantilevered, and self-deformation will directly have influence on measuring accuracy.

Another kind of at the laser alignment instrument that adopts, though the precision height, it costs an arm and a leg, and needs again to be installed on the axle, especially to on-line monitoring, can't load onto sometimes, thereby its application has been subjected to limitation at all.

This novel purpose aims to provide a kind of precision height, and cost is low, rotary machine centering state monitoring apparatus applied widely.

This novel centering state monitoring apparatus is based on the excellent measurement mechanism of list that the ess-strain principle design forms, and this device comprises one and measures rod, strain gauge transducer, transducer and microcomputer.Measure excellent level for one and be positioned at shaft coupling side, its two ends are fixed with two machine end faces respectively, in the both sides of the mid point of rod strain gauge transducer have been installed respectively, and this sensor links to each other with microcomputer through transducer.Like this when between two machine shafts parallel offset or angular deflection taking place, the measurement rod will be deformed, at the sensor of measuring on the rod deformation signal that obtains is defeated by microcomputer by transducer by device, after microcomputer is made software processes, can demonstrates the level of two machines and the opposing parallel of vertical direction and misalign and the angle amount of misaligning.

This installs contained parts can be split type installation, also can collect to be contained in the casing and only the two ends of rod to be stretched out casing, is used for fixing with machine.

Describe novel formation in detail below in conjunction with accompanying drawing.

Fig. 1 is this novel centering monitoring arrangement and instrumentation plan thereof.

1,2 represent two rotary machines respectively among the figure, the 3rd, and shaft coupling, the 4th, measure rod, the 5th, strain gauge transducer, the 6th, transducer, the 7th, microcomputer.

With reference to Fig. 1, measure excellent 4 levels and be positioned at shaft coupling 3 sides, its two ends respectively with machine 1,2 bearing seat or housing are fixed, at A, the B place of measuring excellent mid point both sides a strain gauge transducer 5 has been installed respectively, here, strain gauge transducer is by forming along two foil gauges that circumferentially are affixed on level and the vertical (x, y direction), so that the strain value on measurement of x, the y direction, the foil gauge at A, B place is all received in the microcomputer 7 through transducer 6.When rotary machine occurs misaligning in operational process and causes that when measuring the rod distortion, foil gauge is imported microcomputer with the deformation signal that obtains after transducer becomes electric weight to dependent variable, can calculate the amount of misaligning of x, y direction by software processes.

This device can monitor the centering state of rotary machine at any time, but both static measurements, but also on-line measurement, because strain gauge transducer is than eddy current probe sensor and laser alignment instrument considerably cheaper, also need not a cover cooling system, thereby greatly reduced the cost of centering monitoring arrangement, in addition, strain gauge transducer is not subjected to the on-stream temperature effect that comes out of machine, this the device again with the microcomputer coupling, so the centering situation of change in energy correct response and the recorder running, its precision height, applied widely.

Claims

1, rotary machine centering monitoring arrangement, contain and measure rod, sensor, it is characterized in that measuring rod [4] level for one is positioned at shaft coupling [3] side, its two ends are fixed with the end face of two machines [1,2] respectively, locate to have installed respectively strain gauge transducer [5] at [A, the B] that measure excellent mid point both sides, this sensor links to each other with microcomputer [7] through transducer [6].

2,, it is characterized in that strain gauge transducer is by forming along measuring excellent two foil gauges that circumferentially are affixed on level and vertical by the described centering monitoring arrangement of claim 1.