TW434056B - Vibration diagnostic method for deterioration and malfunction of clamping rollers of coiling machine for heat rolling steel belts - Google Patents

Abstract

Disclosed is a vibration diagnostic method for deterioration and malfunction of clamping rollers of coiling machine for heat rolling steel belts, primarily comprising the steps of: measuring vibration signals, computing signals, determining true value of the amplitude and the peak-to-peak value of the vibration, determining frequency modulation, determining concentration degree of frequency, determining center of a first equivalent frequency, determining rate of wave amplitude, determining center a second equivalent frequency, determining variation of frequency modulation, determining center a third equivalent frequency, and determining center a fourth equivalent frequency, so as to diagnostic the characteristic parameters, such as the time domain, the frequency domain, and the frequency modulation of each vibration signal, which parameters are then implemented to plural formulas to determine whether the clamping rollers are under such abnormal states as, ""loose bearing seats"", ""loose bolts of coupler"", ""damages in bearings"", ""oil leakage in bearings"", ""water found in bearings"", ""inappropriate levelness adjustment of clamping rollers"", and ""trembling"".

Description

434056 A7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economics B7 V. Description of the invention (1) The present invention relates to a vibration diagnosis method for deterioration and failure, and particularly refers to a device that can effectively determine the condition of the rollers. A method for diagnosing the abnormality and the cause of the vibration diagnosis of the deterioration and failure of the rolls of the hot strip coiling machine coil. According to the press, the coiler roll is a very important equipment in the hot rolling production line. Its condition is not only directly related to whether the brake rolling is smooth or not. 1 It also has a decisive effect on the surface quality and coil shape of the steel strip. It is a schematic diagram of the side view of the equipment of the heat-consumption wire coiler. It is reported in the hot-rolling coil reeling area, the roll ι) and the lower roll 101. Its main function is the steel belt 1 〇 2 When the belt is worn and belted, the steel belt is smoothly introduced into the coiler and the proper tension of the steel belt is maintained in the coil; it is easy because the equipment is subject to the impact of high-speed steel belts and runs under a load for a long time. Abrasion and deterioration occur; once the equipment suddenly fails during the machine delay, it will delay production and cause considerable loss of production. The conventional vibration judgment methods focus on equipment abnormalities such as mass imbalance, shaft bending, misalignment, and pumping defects. The diagnostic rules are mostly qualitative descriptions rather than quantitative judgment criteria; these methods are mainly derived from Small test equipment in the laboratory, and wedge simulations are mostly generated by artificial defects; because the abnormal types and conditions of actual equipment are much more complicated than simple artificial defects, the conventional vibration diagnosis method is applied to When the on-site coiler is in a rough state, it is often impossible to accurately diagnose the location and cause of the abnormality. You Rong Yusi 'In order to break through this difficulty and bottleneck, the inventor of this case relied on many years of experience of coiling machine sticks and experience in vibration analysis and testing, carefully researched and designed, and finally developed this paper standard after continuous improvement. Applicable to China National Standard (CNS) A4 specification (210x 297 mm) No. 4 # ------------ 'Installation -------- Order --------- Line, * (Please read the notes on the back before filling out this page) Printed by the Consumers ’Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 V. Description of the invention (2) Description According to the above purpose, the main features of the present invention are Hot-rolled wire coiling area, using the equipment online monitoring system to regularly measure the vibration signals of the roller bearings, and analyze the signal characteristics of the time domain, frequency domain and amplitude modulation; long-term statistics and tracking to find various anomalies Correspondence between the condition and the characteristics of the vibration signal: Then research and create a number of quantitative parameters' representing equipment degradation and fault conditions, and 'set the critical values of each parameter' based on the results of statistical analysis to summarize the causes of various abnormalities Finally, these diagnostic rules are integrated into a complete diagnostic process and developed into a computer program 'incorporated into the equipment online monitoring and diagnosis system, which integrates the system with expert wisdom, and can automatically analyze the characteristics of vibration signals from the measurement signals. Then diagnose the cause of the equipment abnormality. The reason is 'the vibration diagnosis method for the deterioration and failure of the roll of the steel strip hot rolling coiler of the present invention', which mainly includes a vibration signal measurement step, a signal calculation step, an amplitude effective value and a peak-to-peak determination step, and κ amplitude modulation. Frequency determination step, frequency concentration determination step, first equivalent frequency center determination step, wave height ratio determination step, second equivalent frequency center determination step, amplitude modulation variation determination step, third equivalent frequency center determination step, Four equivalent frequency center judgment steps and other steps to diagnose the time domain characteristic parameter value, frequency domain characteristic parameter value and amplitude modulation characteristic parameter of each vibration signal, and then determine whether the condition of the roller is based on a combination of multiple parameter value discriminants. "Loose bearing seat J," loose coupling bolts "," bearing damage "," bearing oil loss "," bearing water ingress "," improper adjustment of the level of the rollers "This paper standard applies to Chinese national standards (CNS > A4 Specifications (210 < 297 @ 第 5 # --------- install -------- order ---------- line (please read the urgent notice on the back before (Fill in this page) 4 3 4-0 5 6 A7 B7 printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. Those who have abnormal conditions such as the description of the invention (3) and chatter phenomenon. In order to have a more detailed and clear understanding of the purpose, efficacy and characteristics of the present invention, the present invention is hereby enumerated. The preferred embodiment and the drawings are explained as follows: First, 'Please refer to the second figure for the flowchart of the steps of a preferred embodiment of the present invention.' Deterioration and failure of the rolls of the hot strip coiling machine of the present invention The vibration diagnosis method mainly includes the vibration signal measurement step i, signal calculation step 2 'amplitude actual value and peak-to-peak determination step; 5, amplitude modulation frequency determination step 4, frequency concentration determination step 5, first, etc. Effective frequency center judgment step 6 'Wave height ratio judgment step 7, second equivalent frequency center judgment step 8, amplitude modulation variation judgment step 9, third equivalent frequency center judgment step 1 〇, fourth equivalent frequency center judgment step 1 1 step; where 'the vibration signal measurement step 1 is to measure the vibration signal of the roller; the signal calculation step 2 is to calculate the time domain characteristic parameter value, frequency of the signal respectively Characteristic parameter values and amplitude modulation characteristic parameters; and set appropriate critical values for individual parameters, and then use the combination of these parameter discriminants to comprehensively judge the mild degradation and fault conditions according to the next steps; they are explained separately as follows: 1. Time-domain characteristic parameters: The time-domain characteristic parameters are calculated based on the time waveform of the vibration signal, calculating the amplitude effective value (i? Ms), amplitude peak-to-peak value (p yarn magic and wave height ratio (C r / c (), etc.) The parameter value 'is used as an indicator for equipment diagnosis. If 7, less η ... is represented as an array of vibration measurement signals, the definition of each time-domain characteristic parameter and its physical meaning are as follows: This paper scale is applicable to China Standard (CNS) A4 Specification (210 X)-_ --------------------- Order --------- line 'I (Please read first Note on the back, please fill out this page again) A7 B7 V. Description of the invention (厶) (I) The effective value of the amplitude represents the equivalent amplitude, which is defined as the standard deviation of the vibration signal.

Rms = JjZ (^-y〇y (1) which is less "represents the average value of the vibration signal 1 wy〇 = N? Fyi (2) printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs (2) amplitude peak-to-peak (PbA ): Represents the change range of the vibration signal from the largest to the smallest _; if wa X f F) represents the maximum value of the vibration signal wide =, less 2, ..., less "), m 2 hitting Γ U represents the minimum value among them "Then define P kp k = max (Y) -min (Y) (3) (3) Wave height ratio (Crfci): shows whether the vibration signal has a shock wave and the intensity of the shock wave, which is defined as: Crfct = Pkpk / 2 / Rms (4) 2 · Frequency-domain characteristic parameters Frequency-domain characteristic parameters are calculated for the frequency spectrum of the vibration signal. The three parameter values such as the peak frequency (FpeaA :), the equivalent frequency center, and the frequency concentration (Fco «) are used as equipment diagnosis. Index. If iY // J / person S 2 persons ..., (TωΜ aJ J represents the spectral line in the vibration spectrum, that is, ryx s ~ represents the frequency /, and the amplitude at l is 1, then each frequency domain characteristic parameter The definition and the physical meaning it represents are as follows: (1) Spike frequency: the largest spike in the frequency spectrum, that is, if i ·, = m ax (Yl, S 2, ..., then Fp eak = f 'The private paper size applies the Chinese National Standard (CNS) A4 specification (210 x 297 Pan-Ai 7th Poor -------- I --- Order ---- ---- I (Please read the notes on the back before filling this page) A7 4 3 4 0 5 6 B7_ _ V. Description of the invention (5) (2) Equivalent frequency center (body regfr): represents the middle spectrum of the spectrum The equivalent center of gravity position of the line distribution is obtained as follows: »First set a threshold value for the frequency spectrum (in the preferred embodiment of the present invention, set the threshold value to 10% of the peak frequency), and the height of the spectral line is lower than Those with this threshold are considered as noise and ignored.-Secondly, find the peaks in the frequency spectrum, which are defined as follows: If 弋 is a peak, the array of each peak is represented by {(Pf i), (pf2 : PS2) ....., the equivalent frequency center is defined as n Σ (where x ice)

FreqCntr = ---- (5) ί—1 (3) Frequency concentration (Fco «): It represents the degree of frequency concentration in the frequency spectrum, that is, it is judged that the spectral line is concentrated or scattered, as a diagnosis whether there is The index of the chattering phenomenon is obtained as follows: As in the preceding paragraph, P 2 people .., (> represents each peak in the frequency spectrum; first, find the peak frequency FpeaA in the frequency spectrum: and set a frequency bandwidth in the present invention. In the preferred embodiment, it is set to 2 0 Η ζ), and then find the ratio of the peak value in the frequency range of ± 5 with Fp e ο as the center, and the ratio to the total peak value and 71 sww, that is, Psum = ^ pst for {Please read the notes on the back before filling in this page)-^ -------- Order ——-------- Printed by the Intellectual Property Bureau of the Ministry of Economic Affairs This paper is in accordance with China National Standard (CNS) A4 (210 χ) printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 _B7_ V. Description of Invention (6) {Fpeak-BWF) < pf} < {Fpeak + (BWF) (6) η.

Tsum = ^ psi T (7) l = sl

Fcon = Psum 1 Tsum χ 100% (8) 3 · Amplitude modulation characteristic parameters Some equipment abnormalities and normal conditions will cause the vibration signal to generate periodic shock waves or cause periodic amplitude modulation; such as the third t diagram It is a schematic diagram of a vibration signal with a periodic shock wave, and the fourth diagram is a vibration signal with a periodic amplitude modulation, which is a schematic diagram; Analyze the repetition frequency of the shock wave or amplitude modulation and the variation of the amplitude modulation. Diagnosing the cause of equipment abnormality can provide considerable help; therefore, according to the amplitude modulation characteristics of the present invention, the two parameters of amplitude modulation frequency (or shock wave repetition frequency) and amplitude modulation variation are described as follows: (1) Amplitude Modulation frequency (or shock wave repetition frequency) Amplitude modulation frequency refers to the number of times the amplitude of a vibration signal changes within a unit time κ, and shock wave repetition frequency refers to the number of times a shock wave occurs within a unit time; the method of analyzing the above frequency is to use Envelope spectrum analysis method; the method is to first rectify the vibration signal and perform low-pass filtering to reduce the high-frequency carrier frequency Filtered out, leaving the low-frequency AM signal, the so-called envelope, and then performing a spectrum analysis on the envelope to obtain the envelope spectrum a. The largest peak in the spectrum is the amplitude modulation frequency or shock wave repetition frequency of the vibration signal. . (2) Amplitude variability This paper scale is applicable to China National Standard (CNS) A4 specification (210 χ Asian 7 public attacks) ------------- Installation -------- Order- -------- Line (please read the intention on the back before filling this page) A7 V. Description of the invention (7 Use Greek waveforms first: If you use the state η conversion to find the amplitude modulation of the vibration signal ' The time waveform of the vibration signal is defined as Yuan Lao_Mao Bote conversion ⑽ is defined as: ㈣Hilber λ (0. Xi (γ)-(ίτ (9) printed by the Consumer Cooperative of Intellectual Property Bureau of the Ministry of Economic Affairs " Using " ⑴ and ⑽, the amplitude modulation waveform of the vibration signal can be calculated according to the following formula ^ (〇 = V? (〇T ^ h \) (10) • A 乂 The fifth diagram illustrates the amplitude modulation waveform as an example Significance of amplitude modulation waveform; Among them, the fifth figure ⑷ is a vibration signal whose amplitude is modulated; using equations (9) and ⑽, the amplitude modulation wave can be obtained as shown in Figure 5 (b). The curve indicated by the arrow in Figure 5 is the curve in Figure 5 (b) *; this curve is the contour of the vibration signal in Figure 5 and describes the signal amplitude modulation. Because Vibration signal amplitude The magnitude of the modulation can clearly reflect the condition of the equipment. Therefore, a quantified index 'referred to as the amplitude modulation variation' developed in the present invention to represent the degree of amplitude modulation is defined as follows: If? Η αχ and W / η represent the first The maximum and minimum values of the amplitude modulation waveform A ~ in Figure 5 (b), then

Amdev = (max- min) / (max + min) χ 100% (11) According to the above definition, 'for a vibration signal whose amplitude does not change with time; its amplitude modulation variation Jmc / ev is close to 0; otherwise, it is the fifth The amplitude of the sharply changing waveform in the figure, the amplitude modulation variability dwrfev is close to the Chinese National Standard (CNS) A4 Specification (210 > ^ 97 公 ^) on this paper scale page 10 ------------ --1 pack —! ---- Order --------- line γ, (Please read the precautions on the back before filling out this page) Employee Cooperation of Intellectual Property Bureau of the Ministry of Economic Affairs Du printed A7 B7 5 Explanation of the invention (8) 1 ° Furthermore, the amplitude effective value and peak-to-peak determination step 3 is to determine whether the amplitude effective value of the above-mentioned vibration signal is greater than a set critical value (0.68G, G is the gravity plus the degree of approximation, approximately 9.81 meters / second 2), or whether the amplitude peak-to-peak value is greater than the set critical value (5G), if yes, proceed to the next step; if not, determine that the equipment condition is normal and end the diagnosis; * the AM frequency judgment Step 4. It is judged that if the amplitude modulation frequency of the vibration signal is a bearing pass frequency, another equivalent frequency punching is performed. Judgment step 41, it is to judge whether the equivalent frequency center of the vibration signal is greater than the set extreme high frequency critical value (160 ΉΉζ). If it is, then it is determined that the roller is bearing damage and the next step is performed. If not, it is determined The hoisting roller is suspected of slight damage to the bearing and the next step is performed; if the amplitude modulation frequency of the vibration signal is not a bearing pass frequency, the next step is directly performed; the frequency concentration determination step 5 is to determine the vibration signal < If the frequency concentration of h is greater than the set critical value (40%), then another peak frequency judgment step 51 is performed. If the peak frequency of the vibration signal is less than the set low frequency critical value (120Hz), then It is judged that the cymbal roller is insufficient in rigidity of the bearing seat. If the peak frequency of the vibration signal is between the set low frequency critical value (120Hz) and the intermediate frequency critical value (3 0 0 Η z), the cymbal roller is determined to be low frequency chattering. If the peak frequency of the vibration signal is between the set intermediate frequency critical value (3 0 0 ζ ζ) and the high frequency critical value (1 000 Hz), it is determined that the roller is intermediate frequency vibration. in National Standard (CNS) A4 Specification (210 X 297 mm) Page 11 ---- I * -------- Installation -------- Order -------- -Line (Please read the precautions on the back before filling this page) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 4 3 4Λ; 5 6 A7 _B7___ 5. Description of the invention (9) Vibration phenomenon, if the peak frequency of the vibration signal If it is higher than the set high-frequency critical value (1 〇 Ο Ο Η z), it is judged that the. 挟 roller is a high-frequency flutter phenomenon and «end the diagnosis; if the frequency concentration of the above-mentioned vibration signal is less than the set critical value (4 0 %), Then proceed to the next step; the first equivalent frequency center determination step 6 is to determine whether the equivalent frequency center of the above-mentioned vibration signal is less than a set low-frequency threshold value (250 Hz), and if so, determine the next 挟The roller bearing seat tightening device is loose and ends the diagnosis. If not, proceed to the next step; The wave height rate judgment > Step 7 is to judge if the wave height rate of the above-mentioned vibration signal is greater than the set critical value (6.5), then another Perform an equivalent frequency center judgment step 71. If it is determined that the equivalent frequency center of the vibration signal is greater than the set intermediate frequency Critical value (400Hz), then perform the AM frequency judgment step 72 to determine whether the AM frequency is twice the speed of the roller. If it is, then it is determined that the roller coupling bolt is loose. If not, it is determined that the roller is suspected to be connected. The shaft bolts are loosened and the diagnosis is ended. If the equivalent frequency center of the vibration signal is less than the set intermediate frequency threshold (400 Hz), the abnormal condition of the roller bearing is unknown and cannot be determined. If the wave height rate of the vibration signal is less than the set critical value (6.5), proceed to the next step. The second equivalent frequency center determination step 8 is to determine whether the equivalent frequency center of the vibration signal is Less than the set intermediate frequency critical value (400 Hz), if yes, then it is judged that the roller bearing has lost oil at the same time and ends the diagnosis, if not, then proceed to the next step; This paper size applies Chinese National Standard (CNS) A4 specifications (210 X 297 mm) Page 12 ------------ f ^ -------- Order --------- lineγ '(please first Read the notes on the back and fill out this page) A7 '_B7_; V. Description of the invention Ί〇) The amplitude of the variation is determined in step 9, it is determined if the vibration amplitude of the variation of the signal is greater than a threshold if the prescribed set · (65%), the other

F Perform an AM frequency judgment step 9. 1. Determine whether the AM frequency is twice the speed of the roller. If it is, determine that the level of the roller is not adjusted properly. If not, determine that the level of the roller is suspected of incorrect level adjustment and end the diagnosis. ; If the amplitude variation of the vibration signal is less than the set critical value (65%), proceed to the next step; The third equivalent frequency center determination step 10 is to determine the equivalent center of the above-mentioned vibration signal. Whether it is less than the set high-frequency critical value < 9 0 0 Hz), if it is *, it is judged that the roller bearing has entered the water and the diagnosis is ended. If not, proceed to the next step; This paper size applies Chinese National Standard (CNS) A4 Specifications (210 X 297 male 1) Page 13 ------------ -Installation -------- Order --------- Cord (Please read the first Please fill in this page again.) The frequency and frequency vibration group, which does not protect the high-power consumption of the J-axis, the full-dimensional anti-judgment of the full-dimensional J-axis, the tA-type dynamic Γ field adjustment system, the Chengming diagnosis. The cut-off is not determined by its fixed axis, but it is judged by J-flat. First, let ’s report the water condition caused by the damage caused by the law. The constant fault domain parameter P inherits the constant fruit step to deny the hetero-redundant frequency term 5: .. The axis Γ heterogeneous judgment is the value of the judgment is mostly Γ, and the judgment of the judgment is based on the clear text and the JJ diagnosis. According to the data, the rate of the J water image is !; The original rate is more frequent and the current rate is more frequent. 0 Youte, Jian Song Chengzhen with frequency effect. At the time of diagnosis, the judges of the helical member Γ Γ and other members ο If this is the case, and the number 4 60 ', the factor number is the axis J to break and change the signal t, and Lianyou J operates the value. At the end of the year, the improper adjustment of the Γ and the improper rectification of the boundary were made by the Consumer Property Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. ^ 43405 A7 B7 V. Description of the invention (11) Measures to avoid production shutdown losses caused by unexpected shutdowns and equipment Quality defects caused by improper adjustments;

The application of this automatic equipment scrutiny function has greatly helped to reduce unplanned downtime, reduce maintenance costs, and maintain stable product quality. In order to verify the effectiveness of this diagnosis and breaking method, the following 5 practical cases are given below, illustrated with drawings and photos as follows: Case 1: Loose bolts of the main shaft coupling of the upper roller of the coiler are loose. Please refer to the vector diagram vibration signal Example (1) shows the vibration signal of the bearing of the hoisting roller on the hot-rolled coiler, where a severe periodic shock wave appears; Figure 7 shows the spectrum of the vibration signal of Figure 6 (1); due to the high amplitude, maintenance personnel The equipment was checked during the shutdown, but no abnormalities were found. As can be seen from the sixth and seventh diagrams, the vibration signal is characterized by a strong periodic shock wave, and its repetition frequency is twice the spindle speed; the frequency spectrum Is characterized by a dispersed pattern with the center of equivalent frequency above 4 Ο Ο Η z; the result of diagnosis using the diagnostic method of the present invention is "coupler bolts loose": now (please read the precautions on the back before filling this page )

II — II — I Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs The main root of the screw 3, according to the manufacturing; the wave-shaped part hits the internal shaft of the organic shaft period, and the main production roll is automatically turned up to cause the roll guide, which shows that it is loose and connected to the deep inspection of Tibet. Foot snail T root} 3 descriptions refer to the above, from the arrow to the outside of the watch, from a member of the person to take care of it, because this paper size applies the Chinese National Standard (CNS) A4 specifications (210) Ministry of Economic Affairs intellectual property Printed by the staff of the Bureau of Consumption and Printing A7 __B7_ V. Description of the Invention (12) Cannot be found during the appearance inspection; however, the vibration signal can clearly reflect the existence of the equipment. Abnormal conditions; the situation in this case _, if you wait until The complete loosening of the bolts will not only cause unexpected downtime during rolling, but also cause damage to the equipment and cause great losses. After the spindle coupler is repaired, the shock wave in the original vibration signal will completely disappear and the amplitude will be greatly reduced. Case 2: Loosening of the bearing block clamping device of the coiler under the coiler-The bearing block clamping device of the coiler of the hot-rolled wire coiler has broken; please refer to Figure 8 for vibration signals. Example (2) Shows the vibration signal of the roller bearing before the clamping device breaks, and the ninth figure is the spectrum of the vibration signal of the eighth figure (b), which shows the vibration spectrum at that time; the characteristic of the vibration signal is that the frequency spectrum is a frequency dispersion pattern. And the vibration frequency is mainly distributed below 2 5 Η Η z; the diagnosis result using the diagnostic method of the present invention is "loose bearing block clamping device"; from the trend graph of increasing amplitude, it can be known that the bearing block clamping device is not suddenly Fracture, but after a few days of deterioration, it should be in a loose state before it breaks. This phenomenon is consistent with the results of the diagnosis; the second photo shows the position of the bearing block clamping device in the roller equipment (as indicated by the arrow). The finger shows the situation when the clamping device is dropped and temporarily welded with an iron bar). Case 3: The bearing of the lower roll of the coiler has lost water and the oil of the hot-rolled coil reel has abnormally increased bearing vibration; please refer to the tenth example of the vibration signal (CNS) A4 specification (210 X 297 male j) 15th tribute ----------------------- Order · -------- (Please read the precautions on the back first (Fill in this page) Bu 4 3 4. U 5 Fi A7 _B7__ 5. Explanation of the invention (13) (3), and the eleventh figure is the frequency spectrum (c) of the tenth vibration signal, and its vibration characteristic is frequency. The spectrum is Frequency dispersion type, vibration (please read the notes on the back before filling this page) The dynamic frequency is mainly distributed between 250Hz and 400Hz, and there is no strong shock wave in the vibration signal; the diagnosis result using the diagnostic method of the present invention is "Bearings lose water and oil at the same time": On-site maintenance personnel disassembled and inspected the bearing during the scheduled repairs, and found that the lubricant in the bearing had been completely lost, and it was filled with water, indicating that the oil seal had failed, and the automatic oiling system had also come out Problem; the photo shows that the bearing caused multiple corrosion and abnormal wear on the roller and the ring surface due to water ingress and oil loss Consumption situation. Case 4: Abnormal wear of the roller bearing on the coiler Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economics Please refer to Figure 12 for examples of vibration signals (IV), and Figure 13 for the spectrum of vibration signals in Figure 12 (4) The vibration characteristics are as follows: the vibration spectrum is a frequency dispersion pattern, there is no strong shock wave and amplitude modulation in the vibration signal, and the equivalent frequency center in the vibration spectrum is between 900Hz and 1600Hz. The diagnosis result using the diagnostic method of the present invention is "abnormal bearing wear"; after disassembling the bearing, it was found that there are obvious indentations and abnormal wear on the outer ring of the bearing. * There are many abnormal wear and peeling above the roller. The traces are shown in the photo 4. The thirteenth figure shows the vibration frequency in the middle frequency range (500 ~ 800Hz) and high frequency range (190 0 ~ 2 1 0 0 Η z). Frequency, due to abnormal abrasion of the bearing, the excitation force increases. This paper size applies the Chinese National Standard (CNS) A4 specification (210 km ^) Page 16 Intellectual Property Bureau, Ministry of Economic Affairs, Consumer Consumption Cooperative Association A7 B7 V. Description of the invention (14) The amplitude of these natural frequencies is significantly higher than that of normal bearing vibration signals (8 times higher in this case). '' Case 5: Intermediate frequency flutter phenomenon of coiler rolls Flutter phenomenon refers to the device vibrating in a manner close to the waves of a single frequency; because the vibration frequency is limited to a very narrow frequency band, the vibration energy is concentrated in a certain frequency A single frequency 'so ^ It is easy to generate vibration roller marks on the roller surface and the steel strip; please refer to Figure 14 for examples of vibration signals (five)' and Figure 15. Figure 14 shows the vibration signals of Figure 14 Spectrum (5) 'The vibration characteristic is a frequency-concentrated spectrum, and the vibration frequency is between 300 Hz and 1000 Hz; Figure 14 shows that the vibration pattern is a simple harmonic close to a single frequency, and the tenth The five graphs show that the vibration spectrum is a spike in energy concentration; these two points are typical characteristics of the flutter phenomenon. The result diagnosed by using the diagnostic method of the present invention is "the intermediate frequency flutter phenomenon of the roller"; the peak frequency in this case k. Is 385 Hz, which will cause a vibration trace of a pitch of about 30 mm according to the calculation result; 5 shows that the vibration roller marks with a pitch of 30 mm are indeed found on the roller surface. In summary, the vibration shirt breaking method for the deterioration and failure of the rolls of the steel strip hot rolling coiler according to the present invention can indeed diagnose the time domain characteristic parameters of each vibration sfL or the vibration signal from the measured vibration signal. Test the numerical value of the frequency domain characteristic parameter value and the amplitude modulation characteristic parameter, and then make a combination of the two-valued columns based on a number of parameters to automatically analyze the characteristics of the vibration signal, and then effectively judge the equipment status of the other double rollers. Paper Size: Suitable for Financial and Family Care (CNS) A4 Specification⑵0

------------- Install -------- Order --------- Line (Please read the precautions on the back before filling this page) 434056 A7 5 、 Explanation of the invention (15) The abnormal position and cause of the abnormality of the jersey are 'so that the present invention is a progress "Xot and no similar or similar items have been disclosed in the city, and it has met the novel patent requirements / Filed an application in accordance with the provisions of the Patent Law. The above is only a preferred embodiment of the present invention. Therefore, where the present invention is applied, the equivalent structural changes in the scope of the month book and the patent application should be included in the patent scope of the present invention. Brief description of the drawings: The first diagram is a schematic side view of the roll equipment of the hot-rolled bismuth coiler. The second figure shows the steps (flow) of a preferred embodiment of the present invention. The third picture shows a schematic diagram of a vibration signal with a periodic shock wave. "--|| The third-signal vibration has the same amplitude and amplitude period. There is a system. Moving one mouth ST " is the real number spectrum of the fifth example of the figure shown in the diagram. Zhi} The example of moving real vibration No. of the six-moving vibration system is shown in the diagram of the seventy-eighth number ---------------- ^ ------ II ^- ------- 1 ^, Ί (Please read the notes on the back before filling out this page) Printed by the Employees ’Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs III (-# Spectrum frequently. No. d number i news Example of the real vibration vibration chart Figure eighteenth movement of the vibration system is shown in the diagram shown in Figure 190 of the fourth frequency of the signal Xun Er Xun Dong Shi Zhen Zhen Zhen Department is shown in the diagram shown in Figure 234, 40, 40th. This paper size is applicable to China National Standard (CNS) A4 (210 X 2t97 mm). Page 18 A7 B7 V. Description of the invention (1 &) The frequency spectrum of the vibration signal of the fourteenth figure (fifth) shown in the fifteenth figure. The reference number in the figure:. Calculation step 3 Amplitude actual value and peak-to-peak judgment step 4 AM frequency judgment step 4 1 Equivalent frequency center judgment step '5 Frequency concentration judgment step 5 1 Spike frequency judgment step 6 An equivalent frequency center judgment step 7 The wave height ratio judgment step 7 1 An equivalent frequency center judgment step 72 Amplitude modulation frequency judgment step 8 A second equivalent frequency center judgment step 9 An amplitude modulation variation judgment step 1 0 A third equivalent frequency center judgment step 1 1Fourth equivalent frequency center judgment step --------------------- Order --------- < Please read the intention on the back first Please fill in this page again) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs ^ This paper size applies to China National Standard (CNS) A4 (210 X 297 male 1) Section 19 贲

Claims (1)

4 3 4 Ο 5 6 A8 B8 C8 D8 6. Scope of patent application 1. A vibration diagnosis method for the deterioration and failure of the rolls of a steel strip hot rolling coiler, which includes the following steps and steps: * Measurement of vibration signals Step, which measures the vibration signal of the cymbal roller; the signal calculation step, which calculates the time domain characteristic parameter value 'frequency domain characteristic parameter value and amplitude modulation characteristic parameter of the signal respectively; wherein the time domain characteristic reference system is directed to The time waveform of the vibration signal, the three parameters of the amplitude effective peak-to-peak amplitude and the wave height ratio (C r / c ί) are calculated as the indicators of the equipment breakage; if h, ..., it represents an array of vibration measurement signals , Then: (1) Amplitude effective value (and 5): Rms = M (y '~ y〇) 2 which represents the average value of the vibration signal (2) Amplitude peak-to-peak value (PA p &): P kpk = max (Y) -min (Y) Among them, wax ΓΓ) represents the vibration signal, and the maximum value of less ^ represents the minimum value of it: (3) Wave height rate (CV / c〇: Crfct ^ Pkpk / 2 / Rms The characteristic parameters in the frequency domain refer to the frequency spectrum of the vibration signal. The calculation of this paper size is applicable to Chinese national standards ( CNS) A4 (210X29? Mm) Page 20 (Please read the note on the back of the page before printing this page-installed 'Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 6. Scope of patent application A8 B8 C8 D8 Frequency (FaeeaA :), equivalent frequency center (FregCii //-), frequency concentration (Fco «), and other three parameter values are used as indicators for equipment diagnosis; if (fM, sM)} 's table vibration The spectral lines in the frequency spectrum, that is, 5 U represents the frequency f, and the amplitude is s ;, J: (1) peak frequency (F /? E < 3 is): Fpeak = /, ^ s, = m ax ( {s ,, s 2, ..., s M}) (2) Equivalent frequency center (Fre 《C /? "): First, set the threshold value of the spectrum using the gate bar value, Those whose height is lower than this threshold are regarded as noise and ignored; secondly, find the peaks in the spectrum 'if and LL., ≪ I _ 2 then J is a peak, then the array formed by each peak is represented by {( pf!, ps i), (pf 2, ps 2) ..... (pf „, ps ,,)} means that the equivalent frequency center is defined as FreqCntr --------- ^- ---- Order ------ 0 (Please read the notes on the back before filling this page) Σ (凡 x 冰) _Σρ3 printed by the production bureau employee consumer cooperatives: (3) Frequency concentration (Fco «): as I in the preceding paragraph, (Pf2, PS2), ..., (pf„, ps „) } Represents the peaks in the spectrum; first find the peak frequency Fpeak 'in the spectrum and set a frequency bandwidth of 5 i7, and then find the Chinese national standard (CNS) A4 volume (2I0X297 mm) applicable to this paper scale Page 21 434056 A8 B8 C8 ____ D8 The scope of the patent application is centered on the ratio of the spikes in the frequency range of the soil and the sum of the spikes, that is, Τ Please read the precautions in the back first, and then Psum = J ^ ps, for {Fpeak-BWF) < pft < (Fpeak + BWF) n Tsum-^ p ^ i / »] Fcon = Psum / Tsum x 1 〇〇% This amplitude modulation characteristic parameter contains the amplitude modulation frequency (or shock wave Repetition frequency) and amplitude modulation variability v) two parameters, of which: (1) amplitude modulation frequency (or shock wave repetition frequency): it is the number of times the amplitude of the vibration signal changes in unit time, and the shock wave repetition frequency It refers to the number of occurrences of shock waves per unit time. (2) AM modulation variability: it uses the Hilbert transform to find the amplitude modulation waveform of the vibration signal: if Shao is used to represent the time waveform of the vibration signal, its Hilbert transform is less defined as the wisdom of the Ministry of Economic Affairs Printed by the Consumer Cooperative of the Property Bureau y (^) ~ —-dr Using Shao and l⑺, the amplitude modulation waveform of the vibration signal can be calculated according to the following formula: 乂 (0 = yy2 (0 + yl (0 this paper scale Applicable to the Chinese National Standard (CNS) A4 (210X297 ^ J7, page 22 S δ δ 8 ABCD VI. Patent application scope Amdev = (max- min) / (max + min) x 100%, where wax and mi «respectively The amplitude modulation waveform is the maximum and minimum values of *; the amplitude actual value and peak-to-peak determination steps are to determine whether the amplitude effective value of the above-mentioned vibration signal is greater than a set critical value (0.68-0, where 0 is the acceleration of gravity , About 9.81 meters / second 2), or whether the amplitude peak-to-peak value is greater than the set critical value (5 G), if yes, proceed to the next step, if not, determine that the equipment condition is normal and end the diagnosis;., AM frequency judgment step Determine whether the amplitude modulation frequency of the vibration signal is a bearing passing frequency. If so, determine whether the roller is bearing damage and proceed to the next step. If not, proceed directly to the next step. The frequency concentration judgment step is to judge the above. Whether the frequency concentration of the vibration signal is greater than the set critical value (40 ° /.), If yes, determine whether the roller is insufficiently rigid or flutters; if not, proceed to the next step; determine the first equivalent frequency center The step is to determine whether the equivalent frequency center of the above-mentioned vibration signal is less than a set low-frequency threshold value (250Hz). If yes, then determine that the lower roller bearing block clamping device is loose and end the diagnosis; if not, proceed to the next step; The wave height rate judgment step is to judge whether the wave height rate of the above-mentioned vibration signal is greater than the set critical value (6.5). If so, the paper size of the table applies the Chinese National Standard (CNS) A4 specification (210X297 mm). Page 23 (please first (Please read the notes on the back of this article and then fill out this page.) ABCD 4-34056 bound by the Intellectual Property Bureau Staff Consumer Cooperatives of the Ministry of Economic Affairs The range judges that the coupling bolt of the roller is loose and ends the diagnosis. If not, proceed to the next step; V (Please read the precautions on the back before filling this page) The second equivalent frequency center judgment step, which is the judgment Is the equivalent frequency center of the above vibration signal less than the set intermediate frequency critical value (400Hz), if it is, then it is judged that the roller bearing has lost oil at the same time and ends the diagnosis; if not, proceed to the next step; amplitude modulation variation The judging step is to judge whether the amplitude modulation variability of the above-mentioned vibration signal is greater than a set critical value (6 5%). If so, it is judged that the level of the hoist roller is not adjusted properly and diagnosed. If not, proceed to the next step; The third step of determining the equivalent frequency center is to determine whether the equivalent frequency center of the above-mentioned vibration signal is less than a set intermediate frequency threshold (900 Hz). If so, determine that the roller bearing has entered water and end the diagnosis. If not, proceed to the next step. The fourth equivalent frequency center judgment step printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs is to judge the above-mentioned equivalent frequency of the vibration signal. It is smaller than the set threshold of extremely high frequency (1 6 0 0 Η z), if yes, determines that the nip roller bearing wear, and the diagnosis is finished, if not, it is determined to be abnormal device condition of unknown cause, and ends the diagnosis. 2 · According to the vibration diagnosis method for the deterioration and failure of the rolls of the steel strip hot rolling coiler according to item 1 of the scope of the patent application, if the amplitude modulation frequency judgment step determines that the amplitude modulation frequency of the vibration signal is a bearing passing frequency, Another equivalent frequency center judgment step is performed. The paper size is in accordance with Chinese National Standard (CNS) A4 specification (210 × 297 mm). Page 24 ABCD Printed by the Consumers ’Cooperative of Intellectual Property Bureau of the Ministry of Economic Affairs. Determine whether the center of the equivalent frequency of the vibration signal is greater than the set extreme high frequency critical value (1600 Hz). If it is, then it is judged that the 挟 7 Xingkun is bearing damage. If not, then it is judged that the 挟 roll is suspected of minor bearing damage. 3 _ Vibration diagnosis method for the deterioration and failure of the rolls of the steel strip hot-rolling coiler according to item 1 of the scope of patent application, wherein if the frequency concentration determination step judges that the frequency concentration of the vibration signal is greater than the setting The critical value (40%), and another step of determining the peak frequency, if the peak frequency of the vibration signal is less than the set low-frequency critical value (1 2 0 Η z), then it is determined that the roller has insufficient rigidity in the bearing seat. If the peak frequency of the vibration signal is between the set low frequency critical value (120Hz) and the intermediate frequency critical value (300Hz), it is determined that the roller is a low frequency flutter phenomenon. If the peak frequency of the vibration signal is between the set Between the intermediate frequency critical value (3 0 0 Η z) and the high frequency critical value (1 0 0 0 Η ζ), it is determined that the roller is an intermediate frequency flutter phenomenon. If the peak frequency of the vibration signal is higher than the set value If the high frequency critical value (1 0 0 0 Η ζ) is determined, the hoist roller is a high frequency vibration-like phenomenon. 4 · According to the vibration diagnosis method for the deterioration and failure of the rolls of the steel strip hot-rolling coiler according to item 1 of the scope of the patent application, in the step of determining the wave height rate, if the wave height rate of the vibration signal is greater than a set critical value ( 6.5), perform another equivalent frequency center judgment step. If it is determined that the equivalent frequency center of the vibration signal is greater than the set intermediate frequency critical value (400 Hz), then perform the amplitude modulation frequency determination step to determine whether the amplitude modulation frequency is a roller. 2 times the rotation speed, if it is, the paper size is judged to apply the Chinese National Standard (CNS) A4 specification (210X297 mm). Gutter on page 25 (please read the precautions on the back before filling this page). Printed by the Consumer Cooperative 434056 A8 B8 C8 D8 VI. The patent application Fan Yuan determined that the pinch roller coupling bolt is loose, if not, it is determined that the pinch roller is suspected of loosening the coupling bolt; if the equivalent frequency center judgment step is judged The center of the equivalent frequency of the vibration signal is less than the set intermediate frequency threshold (40 Hz), then it is determined that the roller shaft is abnormal and the reason is unknown and cannot be diagnosed. 5 · According to the vibration diagnosis method for the degradation and failure of the rolls of the steel strip hot-rolling coiler according to item 1 of the scope of the patent application, where the amplitude modulation variation judgment step determines that the amplitude variation of the vibration signal is greater than a set threshold Value (65 '%), another amplitude modulation frequency judgment step is performed to determine whether the amplitude modulation frequency is twice the rotation speed of the roller. If it is, it determines that the level of the roller is not adjusted properly. If not, it determines that the roller is suspected of being horizontal. Improper adjustment. 6. The vibration diagnosis method for the deterioration and failure of the rolls of the steel strip hot-rolling coiler according to item 1 of the scope of the patent application, wherein, in the signal calculation step, the amplitude modulation frequency (or the repetition frequency of the shock wave) The method is to use the envelope spectrum analysis method. First, the vibration signal is rectified and low-pass filtered. The high-frequency carrier frequency is filtered out, leaving the low-frequency amplitude-modulated signal, the so-called envelope, and then the envelope is generated. Spectrum analysis to obtain the envelope spectrum. From the largest peak in the spectrum, the amplitude modulation frequency or shock wave repetition frequency of the vibration signal is known. (Please read the precautions on the back first: this page) Install 1 11T line · This paper size is applicable to China National Standard (CNS) A4 (210 X 297 mm) Page 26