JPH0543263B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) This invention is applicable to rolling mills and shears for metals, paper, etc., as well as other iron-making machines, etc.
The present invention relates to a method for diagnosing the amount of backlash occurring in a drive system of a rotating machine having a rotating mechanism.

(Prior art and its problems) Backlash is likely to occur in drive systems of rotating machines, especially drive systems that use reduction gears or cam waltz. Conventionally, the amount of backlash in the drive system of such a rotating machine has been evaluated by, for example, the amount of play in the gear system by bringing the gears into contact with the action surface and the reaction surface, and by the magnitude of the rotation angle at that time. However, this method has the disadvantage that it can only be carried out when the equipment is stopped, and that play around the bearing cannot be evaluated. On the other hand, in "Rolling Equipment Subcommittee Materials" Rolling 33--4 "Bulking mill spindle torque continuous monitoring device" Sumitomo Metal Industries (Kashima), braking is applied during operation of the rolling mill, and the rolling The gap (angular conversion value) of the drive system (gear system only) is determined quantitatively from changes in torque and rotational speed.
However, with this method, it is not possible to accurately determine the amount of backlash during steady operation.

(Object of the Invention) The object of the present invention is to solve the problems of the prior art described above, and to enable continuous, accurate and easy control of the degree of play in the drive system during steady operation of a rotating machine. In addition, it is an object of the present invention to provide a method for diagnosing play in a drive system of a rotating machine that can perform a comprehensive play evaluation of the drive system including play around the bearings.

(Means for Achieving the Object) In order to achieve the above object, in the method for diagnosing backlash in the drive system of a rotating machine according to the present invention, the drive shaft torque of the rotating machine is measured, and the drive shaft torque obtained by the measurement is At least one of a TAF value analysis, a contribution rate analysis, and a high frequency component analysis is executed from the data, and based on the analysis result, play in the drive system of the rotating machine is prohibited. At this time, in the TAF value analysis, the amount of backlash is analyzed from the change in the ratio value (TAF value) between peak torque and steady torque in the drive shaft torque data, and in the contribution rate analysis, the amount of backlash is analyzed based on the change in the ratio of peak torque to steady torque (TAF value) in the drive shaft torque data. The amount of play is analyzed from the change in the contribution rate of the overlap by performing a overlap analysis with the driving conditions of Analyze the amount of backlash from changes in high frequency components.

(Embodiment) The drawing is a block diagram showing an example of an apparatus configuration for realizing the method according to the present invention. In the following, an embodiment in which the present invention is applied to a rolling mill will be described in detail, but the present invention can be similarly applied to rotating machines other than rolling mills.

In the drawing, a torque sensor (not shown) and an induction power type FM telemeter 1 are installed on the rolling mill drive shaft (not shown) as close to the motor as possible, and the rolling mill power detected by the torque sensor The torque signal of the drive shaft is wirelessly transmitted via the FM telemeter 1. The FM telemeter 1 is continuously supplied with power from an induction power supply device 2, and is configured to derive a drive shaft torque signal in a so-called free maintenance manner.

The drive shaft torque signal transmitted from the FM telemeter 1 is received by the receiver 3. The received drive shaft torque signal is converted from an analog signal to a digital signal by the A/D converter 4, and then
Five microcomputers will be provided. On the other hand, the microcomputer 5 is connected to a process computer 6 for controlling the rolling mill, and receives rolling material information and rolling condition information from the process computer 6. The rolled material information is, for example, information regarding the dimensions of the rolled material, and includes data representing the width and thickness of the rolled material. The rolling condition information is information regarding rolling conditions, and includes data representing, for example, rolling reduction, rolling temperature, speed difference between roll speed and rolled material, roll diameter, and the like.

The microcomputer 5 automatically samples and imports the above-described drive shaft torque data, rolling material information, and rolling condition information online. Note that if online processing is difficult, batch processing can also be used.

The microcomputer 5 executes three types of analysis based on the input data: TAF value analysis, contribution rate analysis, and high frequency component analysis. Further, the microcomputer 5 uses these analysis results for trend management in chronological order, and further determines abnormalities in the rolling mill drive system based on the analysis results. These analysis processing, trend management processing, and abnormality determination processing will be described in detail below.

The first analysis process is TAF value analysis. In TAF value analysis, the value of the ratio of peak torque to steady torque in drive shaft torque data (TAF value:
The degree of backlash in the rolling mill drive system is quantified from the change in Troque Amplification Factor). Here, the peak torque is the maximum torque value in a predetermined section, and the predetermined section may be, for example, the section from when the rolled material is bitten into the roll until it comes out (in this case, it is generally is the peak), and it is also possible to further subdivide the area between them. In addition, steady torque is usually proportional to the load, and for example, the convergence value of the drive shaft torque that fluctuates in the above-mentioned predetermined section can be taken as steady torque.When the play in the rolling mill drive system (including play around the bearings) increases, It has been found that the TAF value increases accordingly, and the degree of variation in the TAF value also increases. Therefore, the value of the TAF value itself and the TAF
It becomes possible to quantitatively determine the looseness of the rolling mill drive system from, for example, the value of standard deviation as an index representing the degree of variation in values. From this point of view
In TAF value analysis, the TAF value and, if necessary, its standard deviation are determined as basic data for evaluating the backlash of the rolling mill drive system.

The second analysis process is contribution rate analysis. In the contribution rate analysis, multiple regression analysis is performed between drive shaft torque data and predetermined drive conditions, and the degree of backlash in the rolling mill drive system is quantified from changes in the regression contribution rate. The predetermined driving conditions include, for example, the dimensions of the rolled material (width, thickness, etc.) and rolling conditions (reduction ratio, rolling temperature,
(roll speed, speed difference of rolled material, roll diameter, etc.), and these data are given from the process computer 6 as described above. The multiple regression equation may be of any format, and the drive shaft torque theoretically calculated in real time using the multiple regression equation and the actually measured drive shaft torque are compared,
The coincidence rate of both, that is, the contribution rate (0≦contribution rate≦1
The closer it is to 1, the better). It has been found that as the play in the rolling mill drive system (including play around the bearings) increases, the contribution rate decreases and the degree of variation in the contribution rate increases. Therefore, it is possible to quantitatively determine the backlash of the rolling mill drive system from the value of the contribution rate itself or the value of, for example, the standard deviation as an index representing the degree of variation in the contribution rate. From this point of view, in the contribution rate analysis, the contribution rate and, if necessary, its standard deviation are determined as basic data for evaluating the looseness of the rolling mill drive system.

The third analysis process is high frequency component analysis. In the high frequency component analysis, frequency analysis of the drive shaft torque data is performed, and the degree of backlash in the rolling mill drive system is quantified from changes in the included high frequency components. A high frequency component is, for example, a frequency component of 20 to 50 Hz or more, and as an index for quantifying the content of high frequency components, for example, the total amount of energy of the high frequency components may be determined, or only a certain arbitrary high frequency component may be used. You may pay attention to its size. It has been found that as the play in the rolling mill drive system (including play around the bearings) increases, the amount of high frequency components increases accordingly (this is more noticeable in shear). Therefore, it becomes possible to quantitatively determine the play in the rolling mill drive system from the total energy amount of the high frequency components and the magnitude of a predetermined high frequency component. From this point of view, in high frequency component analysis, the total energy amount of high frequency components or the magnitude of a predetermined high frequency component is determined as basic data for evaluating play in the rolling mill drive system.

In the trend management process, based on the above analysis results, the degree of backlash in the rolling mill drive system is managed in a time-series and quantitative manner, and each device in the drive system is maintained in condition based maintenance (CBM). . For example, when using online processing, the analysis results are constantly output, or the analysis results are stored in memory and read out as needed, and the rolling mill The progress of play in the drive system can be diagnosed. The best analysis result is immediately after replacing the drive system mechanism, and the worst is immediately before replacing it, so by comparing it with past diagnosis results, it is possible to determine the percentage of play that has progressed. It becomes possible to make a quantitative determination. Furthermore, when using batch processing, the analysis results for each month can be output in a graph, for example, and diagnosis similar to that using the online processing described above can be performed.

In the abnormality determination process, it is determined based on the above analysis results whether the backlash in the rolling mill drive system has reached an unacceptable level, and an alarm is issued before the equipment is seriously damaged. For example, the determination method is to multiply each analysis result of TAF value analysis, contribution rate analysis, and high frequency component analysis by a pre-selected unique evaluation coefficient, and then check whether the total has reached a predetermined value. It can be judged comprehensively. For example, each analysis result may be represented as a multidimensional table, a warning zone may be set in advance in the multidimensional table, and an alarm may be issued when the actual analysis result reaches this warning zone. . In response to this alarm, the operator will conduct a detailed inspection or disassembly inspection.

In addition to the above processing, the microcomputer 5 can also perform quantitative management of the rolling mill load. In other words, if the actually measured drive shaft torque is always stored in memory and outputted only when necessary, for example in the form of a graph,
What kind of load is being applied to the rolling mill can be known chronologically and quantitatively. As an example of the use of this data, if you compare it with the backlash diagnosis results above, if there is an abnormal change in the way the load is applied even though the progress of play is small, for example, if the processing equipment in the front stage of the rolling mill is It can be predicted that some kind of inconvenience has occurred.

In the above example, three types of analysis were used: TAF value analysis, contribution rate analysis, and high frequency component analysis, but it is not necessary to use all of them, and they may be used in appropriate combinations or singly depending on the situation. .

(Effects of the Invention) As described above, according to the present invention, it is possible to continuously and quantitatively manage the degree of play in the drive system of a rotating machine during steady operation. Therefore,
Since it is possible to prevent operational troubles due to definitive damage to equipment, it is possible to prevent operational losses due to equipment malfunctions and shutdowns. Furthermore, maintenance costs can be reduced because repairs can be carried out before equipment is seriously damaged. In addition, it is possible to effectively prevent product quality abnormalities due to play in the drive system.

Furthermore, according to the present invention, it is possible to perform a comprehensive evaluation of play in the drive system, including play around the bearings of rotating machinery, and the operator can diagnose the play in a single step.
This can be done easily and accurately by manually operating the terminal. In addition to backlash diagnosis, it is also possible to constantly quantitatively manage the load on the drive system.

[Brief explanation of drawings]

The drawing is a block diagram showing an example of a device configuration for implementing the method according to the present invention. 1...FM telemeter, 2...Induction power supply device,
3...Receiver, 4...A/D converter, 5...Microcomputer, 6...Process computer.

Claims (1)

[Claims] 1. Measure the drive shaft torque of the rotating machine, perform at least one of TAF value analysis, contribution factor analysis, and high frequency component analysis from the drive shaft torque data obtained from the measurement, and based on the analysis results. In the TAF value analysis, the amount of play is analyzed from a change in the ratio of peak torque to steady torque (TAF value) in the drive shaft torque data. However, in the contribution rate analysis, a multiple regression analysis is performed between the drive shaft torque data and a predetermined drive condition, and the amount of backlash is analyzed from the change in the contribution rate of the rotation, and in the high frequency component analysis, A method for diagnosing play in a drive system of a rotating machine, which performs frequency analysis of the drive shaft torque data and analyzes the amount of play based on changes in high frequency components included.