CN102721536A - Method for detecting and positioning clamping fault of hydraulic valve - Google Patents
Method for detecting and positioning clamping fault of hydraulic valve Download PDFInfo
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- CN102721536A CN102721536A CN2012101739967A CN201210173996A CN102721536A CN 102721536 A CN102721536 A CN 102721536A CN 2012101739967 A CN2012101739967 A CN 2012101739967A CN 201210173996 A CN201210173996 A CN 201210173996A CN 102721536 A CN102721536 A CN 102721536A
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Abstract
The invention relates to a method for detecting and positioning a clamping fault of a hydraulic valve. The hydraulic valve comprises a valve element and a valve body; and the valve body comprises a valve wall and a valve cavity. The method comprises an installing step, a step of calibrating a normal reference, a step of calibrating a clamping reference and a detecting step, or comprises the installing step, the step of calibrating the reference and the detecting step. After the technical scheme is adopted, the clamping fault of the valve element of a slide valve can be conveniently and accurately forecast and detected in real time and the clamping position can be conveniently and accurately judged in real time.
Description
Technical field
The present invention relates to a kind of chucking fault of hydraulic valve, particularly a kind of detection and localization method of hydraulic valve chucking fault.
Background technology
Sliding valve core mechanism adopts maximum a kind of version in all kinds of hydraulic valves.Guiding valve generally comprises spool and valve body, and valve body comprises valve wall and valve pocket.Guiding valve chucking fault is one of common faults and failure mode the most in the hydraulic system.Hydraulic system is as high-power topworks, in case appearance chucking fault, the lighter's thrashing, weight person goes back entail dangers to equipment even personal safety.Therefore, at first, find that in time the chucking fault is most important to the safe operation of hydraulic system; Secondly, more can fault be nipped in the bud to the forecast that tightens fault, significant to the reliability that improves total system; The 3rd, if the chucking fault takes place, that lateral location that the judgement spool is clamped in the valve pocket is also very crucial for the chucking troubleshooting of faults.
Obtaining of existing guiding valve chucking information mainly is to realize through the detection to hydraulic system pressure, flow, displacement equivalent, belongs to the indirect detection method of diagnosing, can't directly obtain the spool duty.Special, the factor that influences parameters such as pressure, flow, displacement is a lot, and chucking is one of them, therefore tightens the accuracy that detects and remains to be weighed.
The scholar who also has proposes to utilize the variation that is superimposed upon the vibrating signal on the spool to detect chucking bite fault; This method can realize tightening the detection and the forecast of fault to a certain extent; But because it also is to change indirect detection spool mechanical motion state through electromagnetic field; Exist the decision influence factor many, judgment threshold is difficult to problems such as unified demarcation.
In addition, for the decision method of chucking back valve core chucking position, the then less report that is seen in.
In view of this, the inventor combines to be engaged in hydraulic valve area research work experience for many years, and the defective of above-mentioned technical field is studied for a long period of time, and this case produces thus.
Summary of the invention
The object of the present invention is to provide a kind of detection and localization method of hydraulic valve simple in structure, with low cost chucking fault, can make things convenient for, accurate, real-time forecast, detect valve core of the spool valve chucking fault, judge the chucking position.
To achieve these goals, technical scheme of the present invention is following:
A kind of detection and localization method of hydraulic valve chucking fault, hydraulic valve comprises spool and valve body, valve body comprises valve wall and valve pocket.Comprise installation steps, demarcate normal benchmark step, demarcate chucking benchmark step and detect step, specific as follows:
Wherein installation steps are meant the lateral surface that a plurality of ultrasonic transducers is fixedly installed in hydraulic valve body, and the axis of the axial line of ultrasonic transducer and valve body internal valve cavity intersects vertically;
Wherein demarcate normal benchmark step; Be meant hydraulic valve is adjusted to nominal situation, be about to the axis coincidence that spool is adjusted to spool and valve pocket, through the ultrasound detection control of intelligent controller; And the amplitude of intelligent controller output control; The reference signal amplitude of correspondence repeats aforesaid operations when obtaining signal amplitude as monitoring point, particular ultrasound transducer place nominal situation, the complete reference signal amplitude when finally obtaining monitoring point, a plurality of ultrasonic transducers place nominal situation;
Wherein demarcate chucking benchmark step; Be meant hydraulic valve is adjusted to the chucking operating mode; Ultrasound detection through intelligent controller is controlled, and the amplitude of intelligent controller output control, the reference signal amplitude of correspondence when obtaining signal amplitude as monitoring point, particular ultrasound transducer place chucking operating mode; Repeat aforesaid operations, the complete reference signal amplitude when finally obtaining monitoring point, a plurality of ultrasonic transducers place chucking operating mode;
Wherein detect step; Be meant general operating mode to hydraulic valve; Through the ultrasound detection control of intelligent controller, and the detection of intelligent controller output control, the gripping orientation information whether this monitoring point exists chucking fault and chucking fault light and heavy degree etc. obtained; Repeat aforesaid operations; Whether the final monitoring point, a plurality of ultrasonic transducers place that obtains exists the comprehensive gripping orientation information that tightens fault and chucking fault light and heavy degree etc.; Handle through fuzzy algorithm, draw relevant hydraulic valve and whether exist the chucking of chucking fault and chucking fault light and heavy degree to detect conclusion;
Said intelligent controller comprises CPU module, high-speed a/d modular converter, echoed signal filtering amplification module, ultrasound emission module and multichannel handover module; CPU module links to each other with the high-speed a/d modular converter, but the echoed signal of processing collected; CPU module links to each other with the ultrasound emission module, and the may command ultrasonic pulse produces; CPU module links to each other with the multichannel handover module, is used in to switch ultrasound emission, reception object between a plurality of ultrasonic transducers; The ultrasound emission module links to each other with the multichannel handover module, and the high-speed a/d modular converter links to each other with echoed signal filtering amplification module, and echoed signal filtering amplification module links to each other with the multichannel handover module, and the multichannel handover module links to each other with a plurality of ultrasonic transducers;
Said ultrasonic transducer and valve body lateral surface directly scribble acoustic coupling medium;
The ultrasound detection control of said intelligent controller is meant ultrasonic transducer is linked to each other with the multichannel handover module, starts CPU module work; The CPU module follow procedure is at first controlled the multichannel handover module and is connected a certain ultrasonic transducer; Starting the ultrasound emission module then sends electric signal and is added on this ultrasonic transducer; The ultrasonic pulse that this ultrasonic transducer is excited to produce gets into the valve wall through acoustic coupling medium and propagates therein; Gap location between valve wall and spool, because the hydraulic oil in the gap is different with the acoustic impedance of valve wall, ultrasound wave produces emission at gap location; The partial reflection energy returns this ultrasonic transducer along former incident approach; This ultrasonic transducer changes it into electric pulse again, and this electric impulse signal is input to the high-speed a/d modular converter after through echoed signal filtering amplification module and converts digital quantity into and send to CPU module, and the reflection wave electric pulse record that CPU module will be gathered is also preserved;
The amplitude output control of said intelligent controller; Be meant the CPU module follow procedure of intelligent controller; At first with the back wave electric pulse of record and preservation in the ultrasound detection control of intelligent controller, as the burst of this monitoring point, next is based on hydraulic valve and ultrasound parameter; Calculate the echo position in gap between spool valve wall, at last based on the signal amplitude of the corresponding amplitude in this positional information extraction burst as this monitoring point;
The detection output control of said intelligent controller; Be meant the CPU module follow procedure of intelligent controller; Reflection wave electric pulse with record and preservation in the ultrasound detection control of intelligent controller; Corresponding reference signal amplitude is compared during with this monitoring point chucking operating mode after the amplitude-frequency analyzing and processing, draws the gripping orientation information whether this monitoring point exists chucking fault and chucking fault light and heavy degree etc.
Further, in the said installation steps, a plurality of ultrasonic transducers are the even number more than six, are divided into two rows, are parallel on adjacent two lateral surfaces that are installed in valve body of valve body internal valve cavity axis, and each ultrasonic transducer on each side is uniformly-spaced arranged.Thereby convenient, accurate, real-time forecast, detection valve core of the spool valve chucking fault, judgement chucking position, and cost is cheaper, and structure is simpler.
Further; Also comprise positioning step, said positioning step is meant, when said detection step draws hydraulic valve existence chucking fault; The CPU module follow procedure of said intelligent controller; According to the comprehensive gripping orientation information that detects the monitoring point, a plurality of ultrasonic transducers place that is obtained in the step, obtain three-dimensional chucking information, the chucking position that can draw spool after comprehensive.
Further, said Frequency for Ultrasonic Energy Transducer is more than 10MHz.This design is to consider that spool and valve wall gap are less, thus the above-mentioned technique effect of more economical realization.
Further, the A/D converter in the said intelligent controller high speed A/D modular converter is selected the A/D chip of ADS5485 or equal performance for use, and said ultrasonic transducer is selected normal probe for use, and said acoustic coupling medium is a machine oil.Thereby the above-mentioned technique effect of more economical realization.
A kind of detection and localization method of hydraulic valve chucking fault, hydraulic valve comprises spool and valve body, valve body comprises valve wall and valve pocket.Comprise installation steps, demarcate the benchmark step and detect step, specific as follows:
Wherein installation steps are meant the lateral surface that a plurality of ultrasonic transducers is fixedly installed in hydraulic valve body, and the axis of the axial line of ultrasonic transducer and valve body internal valve cavity intersects vertically;
Wherein demarcate the benchmark step; Be meant hydraulic valve is adjusted to nominal situation; Be about to spool and adjust to the axis coincidence of spool and valve pocket; Through the ultrasound detection control of intelligent controller, and the amplitude of intelligent controller output control, the reference signal amplitude of correspondence when obtaining signal amplitude as monitoring point, particular ultrasound transducer place nominal situation; Hydraulic valve is adjusted to the chucking operating mode, control through the ultrasound detection of intelligent controller, and the amplitude of intelligent controller output control, the reference signal amplitude of correspondence when obtaining signal amplitude as monitoring point, particular ultrasound transducer place chucking operating mode; Repeat aforesaid operations, the complete reference signal amplitude when finally obtaining monitoring point, a plurality of ultrasonic transducers place nominal situation during with the chucking operating mode;
Wherein detect step; Be meant general operating mode to hydraulic valve; Through the ultrasound detection control of intelligent controller, and the detection of intelligent controller output control, the gripping orientation information whether this monitoring point exists chucking fault and chucking fault light and heavy degree etc. obtained; Repeat aforesaid operations; Whether the final monitoring point, a plurality of ultrasonic transducers place that obtains exists the comprehensive gripping orientation information that tightens fault and chucking fault light and heavy degree etc.; Handle through fuzzy algorithm, draw relevant hydraulic valve and whether exist the chucking of chucking fault and chucking fault light and heavy degree to detect conclusion;
Said intelligent controller comprises CPU module, high-speed a/d modular converter, echoed signal filtering amplification module, ultrasound emission module and multichannel handover module; CPU module links to each other with the high-speed a/d modular converter, but the echoed signal of processing collected; CPU module links to each other with the ultrasound emission module, and the may command ultrasonic pulse produces; CPU module links to each other with the multichannel handover module, is used in to switch ultrasound emission, reception object between a plurality of ultrasonic transducers; The ultrasound emission module links to each other with the multichannel handover module, and the high-speed a/d modular converter links to each other with echoed signal filtering amplification module, and echoed signal filtering amplification module links to each other with the multichannel handover module, and the multichannel handover module links to each other with a plurality of ultrasonic transducers;
Said ultrasonic transducer and valve body lateral surface directly scribble acoustic coupling medium;
The ultrasound detection control of said intelligent controller is meant ultrasonic transducer is linked to each other with the multichannel handover module, starts CPU module work; The CPU module follow procedure is at first controlled the multichannel handover module and is connected a certain ultrasonic transducer; Starting the ultrasound emission module then sends electric signal and is added on this ultrasonic transducer; The ultrasonic pulse that this ultrasonic transducer is excited to produce gets into the valve wall through acoustic coupling medium and propagates therein; Gap location between valve wall and spool, because the hydraulic oil in the gap is different with the acoustic impedance of valve wall, ultrasound wave produces emission at gap location; The partial reflection energy returns this ultrasonic transducer along former incident approach; This ultrasonic transducer changes it into electric pulse again, and this electric impulse signal is input to the high-speed a/d modular converter after through echoed signal filtering amplification module and converts digital quantity into and send to CPU module, and the reflection wave electric pulse record that CPU module will be gathered is also preserved;
The amplitude output control of said intelligent controller; Be meant CPU module 1 follow procedure of intelligent controller; At first with the back wave electric pulse of record and preservation in the ultrasound detection control of intelligent controller, as the burst of this monitoring point, next is based on hydraulic valve and ultrasound parameter; Calculate the echo position in gap between spool valve wall, at last based on the signal amplitude of the corresponding amplitude in this positional information extraction burst as this monitoring point;
The detection output control of said intelligent controller; Be meant CPU module 1 follow procedure of intelligent controller; Reflection wave electric pulse with record and preservation in the ultrasound detection control of intelligent controller; Corresponding reference signal amplitude is compared during with this monitoring point chucking operating mode after the amplitude-frequency analyzing and processing, draws the gripping orientation information whether this monitoring point exists chucking fault and chucking fault light and heavy degree etc.
Further, in the said installation steps, a plurality of ultrasonic transducers are the even number more than six, are divided into two rows, are parallel on adjacent two lateral surfaces that are installed in valve body of valve body internal valve cavity axis, and each ultrasonic transducer on each side is uniformly-spaced arranged.Thereby convenient, accurate, real-time forecast, detection valve core of the spool valve chucking fault, judgement chucking position, and cost is cheaper, and structure is simpler.
Further; Also comprise positioning step, said positioning step is meant, when said detection step draws hydraulic valve existence chucking fault; The CPU module follow procedure of said intelligent controller; According to the comprehensive gripping orientation information that detects the monitoring point, a plurality of ultrasonic transducers place that is obtained in the step, obtain three-dimensional chucking information, the chucking position that can draw spool after comprehensive.
Further, said Frequency for Ultrasonic Energy Transducer is more than 10MHz.This design is to consider that spool and valve wall gap are less, thus the above-mentioned technique effect of more economical realization.
Further, the A/D converter in the said intelligent controller high speed A/D modular converter is selected the A/D chip of ADS5485 or equal performance for use, and said ultrasonic transducer is selected normal probe for use, and said acoustic coupling medium is a machine oil.Thereby the above-mentioned technique effect of more economical realization.
The present invention compares with prior art has following advantage and effect: 1, the principles with ultrasonic inspection tightens fault detect to hydraulic valve, and the method simplicity of design is ingenious, and effect is remarkable; 2, above-mentioned detection method is Non-Destructive Testing, need not to change the hydraulic valve structure; 3, can realize tightening forecast, detection and the abort situation location of fault; 4, directly feed back the spool positional information, than indirect detection better reliability; 5, the signal as the chucking fault detect is single, and accuracy is high, receives interference little.
In order further to explain technical scheme of the present invention, the present invention is done further detailed description below in conjunction with accompanying drawing and embodiment.
Description of drawings
Fig. 1 is the structure flow chart of intelligent controller among the present invention and ultrasonic transducer;
Fig. 2 is ultrasonic transducer installation site synoptic diagram among the present invention;
Fig. 3 is chucking fault detect principle of work synoptic diagram among the present invention.
Embodiment
The present invention uses for reference the principle of ultrasonic inspection, has provided a kind of detection and localization method of hydraulic valve chucking fault.To shown in Figure 3, is the preferred embodiment of adopting equipment therefor of the present invention like Fig. 1.
The principle of work of present technique scheme is following:
Ultrasound wave is that frequency is higher than 20 kilo hertzs mechanical wave, and this mechanical wave can be propagated with certain speed and direction in material, runs into the different heterogeneous interface of acoustic impedance (like the bottom surface of defective or measured object etc.) and will produce reflection.This reflex can be used to carry out UT (Ultrasonic Testing), and the most frequently used is the pulse echo defectoscopy.During flaw detection; The voltage that pulse oscillator sends is added in ultrasonic transducer (ultrasonic probe in other words; Be the detecting element of processing with piezoelectric ceramics or quartz wafer) on, the ultrasonic pulse that ultrasonic transducer sends gets into material through acoustic coupling medium (like machine oil or water etc.) and propagates therein, run into defective after; The partial reflection energy returns ultrasonic transducer along former approach, and ultrasonic transducer changes it into electric pulse again.According to the position and the amplitude (making comparisons) of flaw echo electric pulse, can measure the position and the approximate size of defective with the reflection wave amplitude of artificial defect in the reference block.
The present invention uses for reference the mechanism of above-mentioned ultrasonic inspection, utilizes ultrasound wave to realize forecast, detection and the location of spool chucking in the heterogeneous interface reflex.Hydraulic valve as shown in Figure 3 is when operate as normal; The axis of valve pocket overlaps in spool 9 and the valve body 8; The electric signal that the ultrasound emission module is sent is added on the ultrasonic transducer 6, and the ultrasonic pulse that produces then gets into the valve wall and propagates the gap location between valve wall and spool therein through acoustic coupling medium (machine oil); Because the hydraulic oil in the gap is different with the acoustic impedance of valve wall, ultrasound wave produces emission at gap location.The partial reflection energy returns ultrasonic transducer along former incident approach; Ultrasonic transducer changes it into electric pulse again; CPU module is according to the position t1 and the amplitude v1 of the reflection wave electric pulse of gathering; Carry out fuzzy judgment with reference position t and reference amplitude v, and then obtain being nominal situation this moment, do not have chucking failure judgment information; And work as hydraulic valve because hydraulic lock or machinery chucking make spool depart from position, valve pocket axis.Gap smaller (the bite operating mode among Fig. 3) between this moment spool and the valve wall; CPU module still is t1 (boundary position of valve wall is constant) according to the position of the reflection wave electric pulse of gathering; And amplitude becomes v2; V1 during with nominal situation compares significantly and reduces, and can forecast that thus the chucking fault has the trend of generation; When the chucking fault takes place; This moment, spool departed from the axis far away; And (the bite operating mode among Fig. 3) almost very close to each other between the valve wall, CPU module is according to the position or the t1 of the reflection wave electric pulse of gathering, and amplitude has become v3; If the v3 value is made as the detection threshold that tightens fault, then can whether be lower than the generation that v3 judges the chucking fault through judging reflex amplitude.Otherwise; If the ultrasonic transducer among Fig. 3 is installed in opposite one side; Then in chucking operating mode transforming process, the value of v1 v2 v3 then is to increase progressively relation to hydraulic valve at nominal situation, then can whether be higher than whether v3 judges has the chucking fault to the side generation through judging reflex amplitude.
As preferably, for more accurate forecast, detection and location chucking fault, on the axial cross section of spool, needing two ultrasonic transducers at least is that decidable tightens the position (having 8 kinds of possibility orientation at least) that takes place on this cross section; Because spool is axially having certain length, chucking might occur in any one axial position, and at least 3 transducers on the axis can be used for detecting chucking position in the axial direction.
A kind of detection and localization method of hydraulic valve chucking fault, hydraulic valve comprises spool and valve body, valve body comprises valve wall and valve pocket.Above-mentioned is the state of the art, repeats no more here.
The course of work of chucking failure prediction and detection is following:
With that side surface wiped clean that hydraulic valve is installed ultrasonic transducer, spread acoustic coupling medium (being machine oil in the present embodiment), the equidistant average line placement of a plurality of ultrasonic transducers along the axis of hydraulic valve.Be about to the lateral surface that a plurality of ultrasonic transducers are fixedly installed in hydraulic valve body, the axis of the axial line of ultrasonic transducer and valve body internal valve cavity intersects vertically.Quantity, the concrete distribution of ultrasonic ring ability device can have multiple.As shown in Figure 2, a plurality of ultrasonic transducers 6 are the even number more than six, are divided into two rows, are parallel on adjacent two lateral surfaces that are installed in valve body 8 of valve body internal valve cavity axis, and each ultrasonic transducer on each side is uniformly-spaced arranged.In the present embodiment, as shown in Figure 2, totally six ultrasonic transducers; By central piezo ceramic element, front and back metal cover board, prestress screw rod; Electrode slice and insulation tube are formed, and are divided into outer upper side and external right side face that two rows are installed on hydraulic valve body, and the ultrasonic transducer on each side is three and drops on the straight line; This straight line is parallel with valve body internal valve cavity axis, and ultrasonic transduction implement body installation site is in this surperficial both sides and centre position, and three ultrasonic transducers are uniformly-spaced arranged.Thereby convenient, accurate, real-time forecast, detection valve core of the spool valve chucking fault, judgement chucking position, and cost is cheaper, and structure is simpler.
When using for the first time; Hydraulic valve is adjusted to nominal situation, be about to the axis coincidence that spool is adjusted to spool and valve pocket, through the ultrasound detection control of intelligent controller; And the amplitude of intelligent controller output control; The reference signal amplitude of correspondence repeats aforesaid operations when obtaining signal amplitude as monitoring point, particular ultrasound transducer place nominal situation, the complete reference signal amplitude when finally obtaining monitoring point, a plurality of ultrasonic transducers place nominal situation; Hydraulic valve is adjusted to the chucking operating mode; Ultrasound detection control through intelligent controller; And the amplitude of intelligent controller output control; The reference signal amplitude of correspondence repeats aforesaid operations when obtaining signal amplitude as monitoring point, particular ultrasound transducer place chucking operating mode, the complete reference signal amplitude when finally obtaining monitoring point, a plurality of ultrasonic transducers place chucking operating mode;
Said method is to demarcate whole ultrasonic transducers when adjusting to nominal situation one by one, demarcates whole ultrasonic transducers when adjusting to the chucking operating mode then more one by one.Can certainly take following method, ultrasonic transducer one by one, each ultrasonic transducer are demarcated nominal situation earlier, demarcate chucking operating mode again.Specific as follows:
When using for the first time; Hydraulic valve is adjusted to nominal situation; Be about to spool and adjust to the axis coincidence of spool and valve pocket; Through the ultrasound detection control of intelligent controller, and the amplitude of intelligent controller output control, the reference signal amplitude of correspondence when obtaining signal amplitude as monitoring point, particular ultrasound transducer place nominal situation; Hydraulic valve is adjusted to the chucking operating mode, control through the ultrasound detection of intelligent controller, and the amplitude of intelligent controller output control, the reference signal amplitude of correspondence when obtaining signal amplitude as monitoring point, particular ultrasound transducer place chucking operating mode; Repeat aforesaid operations, the complete reference signal amplitude when finally obtaining monitoring point, a plurality of ultrasonic transducers place nominal situation during with the chucking operating mode.
In addition; The step of above-mentioned demarcation benchmark is to a unknown hydraulic valve, if the hydraulic valve of a certain identical type or a certain same batch is detected; The reference value of using for the first time this similar hydraulic valve to obtain before then can directly duplicating through this two step; But obviously: at first, this measuring method is not to have omitted this two step, but before directly duplicating on the basis of measuring process; Secondly, be to judge more accurately, our suggestion still each hydraulic valve is demarcated goodly one by one, does not have complete living hydraulic valve after all.
As shown in Figure 1, intelligent controller comprises CPU module 1, high-speed a/d modular converter 2, echoed signal filtering amplification module 3, ultrasound emission module 4 and multichannel handover module 5; CPU module 1 links to each other with high-speed a/d modular converter 2, but the echoed signal of processing collected; CPU module 1 links to each other with ultrasound emission module 4, and the may command ultrasonic pulse produces; CPU module 1 links to each other with multichannel handover module 5, is used in to switch ultrasound emission, reception object between a plurality of ultrasonic transducers 6; Ultrasound emission module 4 links to each other with multichannel handover module 5, and high-speed a/d modular converter 2 links to each other with echoed signal filtering amplification module 3, and echoed signal filtering amplification module 3 links to each other with multichannel handover module 5, and multichannel handover module 5 links to each other with a plurality of ultrasonic transducers 6.Realize each module of above-mentioned functions, structures such as its concrete circuit, components and parts owing to belong to prior art, just repeat no more here.Intelligent controller 15 adopts the aviation plug of 2 cores or 4 cores to be connected through multichannel handover module 5 with ultrasonic transducer 6.
The ultrasound detection control of intelligent controller is meant ultrasonic transducer is linked to each other with multichannel handover module 5, starts CPU module 1 work; CPU module 1 follow procedure is at first controlled multichannel handover module 5 and is connected a certain ultrasonic transducer; Starting ultrasound emission module 4 then sends electric signal and is added on this ultrasonic transducer; The ultrasonic pulse that this ultrasonic transducer is excited to produce gets into the valve wall through acoustic coupling medium and propagates therein; Gap location between valve wall and spool; Because the hydraulic oil in the gap is different with the acoustic impedance of valve wall; Ultrasound wave produces emission at gap location, and the partial reflection energy returns this ultrasonic transducer along former incident approach, and this ultrasonic transducer changes it into electric pulse again; This electric impulse signal is input to high-speed a/d modular converter 2 after through echoed signal filtering amplification module 3 and converts digital quantity into and send to CPU module 1, and the reflection wave electric pulse record that CPU module 1 will be gathered is also preserved.
The amplitude output of intelligent controller is controlled, and is meant CPU module 1 follow procedure of intelligent controller, at first; With the reflection wave electric pulse of record and preservation in the ultrasound detection control of intelligent controller, as the burst of this monitoring point, secondly; According to hydraulic valve and ultrasound parameter; Calculate the echo position in gap between spool valve wall, last, according to the signal amplitude of the corresponding amplitude in this positional information extraction burst as this monitoring point.
General operating mode to hydraulic valve; When the chucking fault possibly take place (when appearance in other words needs to judge the chucking failure message of hydraulic valve); Ultrasound detection control through intelligent controller; And the detection of intelligent controller output control, can obtain the gripping orientation information whether this monitoring point exists chucking fault and chucking fault light and heavy degree etc.; Repeat aforesaid operations; Whether the final monitoring point, a plurality of ultrasonic transducers place that obtains exists the comprehensive gripping orientation information that tightens fault and chucking fault light and heavy degree etc.; Handle through fuzzy algorithm, draw relevant hydraulic valve and whether exist the chucking of chucking fault and chucking fault light and heavy degree to detect conclusion.Above-mentioned fuzzy algorithm belongs to prior art, repeats no more here.
The detection output control of intelligent controller; Be meant CPU module 1 follow procedure of intelligent controller; Reflection wave electric pulse with record and preservation in the ultrasound detection control of intelligent controller; Corresponding reference signal amplitude is compared during with this monitoring point chucking operating mode after the amplitude-frequency analyzing and processing, draws the gripping orientation information whether this monitoring point exists chucking fault and chucking fault degree etc.Above-mentioned amplitude-frequency analyzing and processing is specially frequency-domain analysis and amplitude analysis, and these analytical technologies all belong to prior art, repeat no more here.
When the chucking fault occurring, at this moment, show as spool and a certain side valve wall contacts, then the gap between this side valve core and valve wall is close to and disappears.When central processing unit module 1 follow procedure carries out ultrasound detection to this monitoring point; The echoed signal that is collected (being the reflection wave electric pulse) is compared with the reference signal amplitude of chucking operating mode after treatment; Handle the generation that to forecast and to detect the chucking fault, its order of severity etc. through fuzzy algorithm.
Consider that spool and valve wall gap are less, Frequency for Ultrasonic Energy Transducer is at least more than 10MHz.This design is to consider that spool and valve wall gap are less, thus the above-mentioned technique effect of more economical realization.
Ultrasonic transducer is selected normal probe for use, and couplant is a machine oil; A/D converter in the high-speed a/d modular converter is selected the A/D chip of ADS5485 or equal performance for use.Thereby the above-mentioned technique effect of more economical realization.
The course of work of chucking localization of fault is following:
The aforementioned institute device that reaches in steps is with above-mentioned.Also comprise as follows:
When the detection step draws hydraulic valve existence chucking fault; The CPU module follow procedure of intelligent controller; According to the comprehensive gripping orientation information that detects the monitoring point, a plurality of ultrasonic transducers place that is obtained in the step; Obtain three-dimensional chucking information, the chucking position that can draw spool after comprehensive.
The principle of work of above-mentioned location is following: when chucking took place, the part of spool and valve wall pressure were tight, almost do not have the space between the two; And leave the space between remainder and the valve wall.When ultrasonic echo detected, the size in space can be through drawing the echoed signal signature analysis like this.Can obtain the chucking information of this tangent plane along the bull ultrasonic probe of spool axial distribution installation.If more ultrasonic probe is installed along the distribution of spool circumferencial direction, just can obtain steric information about chucking, the position of spool chucking also can be by accurate location in three dimensions.
The above is merely specific embodiment of the present invention, is not the restriction to this case design, and all equivalent variations of doing according to the design key of this case all fall into the protection domain of this case.
Claims (10)
1. the detection and the localization method of hydraulic valve chucking fault, hydraulic valve comprises spool and valve body, valve body comprises valve wall and valve pocket, it is characterized in that: comprise installation steps, demarcate normal benchmark step, demarcate chucking benchmark step and detect step, specific as follows:
Wherein installation steps are meant the lateral surface that a plurality of ultrasonic transducers is fixedly installed in hydraulic valve body, and the axis of the axial line of ultrasonic transducer and valve body internal valve cavity intersects vertically;
Wherein demarcate normal benchmark step; Be meant hydraulic valve is adjusted to nominal situation, be about to the axis coincidence that spool is adjusted to spool and valve pocket, through the ultrasound detection control of intelligent controller; And the amplitude of intelligent controller output control; The reference signal amplitude of correspondence repeats aforesaid operations when obtaining signal amplitude as monitoring point, particular ultrasound transducer place nominal situation, the complete reference signal amplitude when finally obtaining monitoring point, a plurality of ultrasonic transducers place nominal situation;
Wherein demarcate chucking benchmark step; Be meant hydraulic valve is adjusted to the chucking operating mode; Ultrasound detection through intelligent controller is controlled, and the amplitude of intelligent controller output control, the reference signal amplitude of correspondence when obtaining signal amplitude as monitoring point, particular ultrasound transducer place chucking operating mode; Repeat aforesaid operations, the complete reference signal amplitude when finally obtaining monitoring point, a plurality of ultrasonic transducers place chucking operating mode;
Wherein detect step; Be meant general operating mode to hydraulic valve; Through the ultrasound detection control of intelligent controller, and the detection of intelligent controller output control, the gripping orientation information whether this monitoring point exists chucking fault and chucking fault light and heavy degree etc. obtained; Repeat aforesaid operations; Whether the final monitoring point, a plurality of ultrasonic transducers place that obtains exists the comprehensive gripping orientation information that tightens fault and chucking fault light and heavy degree etc.; Handle through fuzzy algorithm, draw relevant hydraulic valve and whether exist the chucking of chucking fault and chucking fault light and heavy degree to detect conclusion;
Said intelligent controller comprises CPU module, high-speed a/d modular converter, echoed signal filtering amplification module, ultrasound emission module and multichannel handover module; CPU module links to each other with the high-speed a/d modular converter, but the echoed signal of processing collected; CPU module links to each other with the ultrasound emission module, and the may command ultrasonic pulse produces; CPU module links to each other with the multichannel handover module, is used in to switch ultrasound emission, reception object between a plurality of ultrasonic transducers; The ultrasound emission module links to each other with the multichannel handover module, and the high-speed a/d modular converter links to each other with echoed signal filtering amplification module, and echoed signal filtering amplification module links to each other with the multichannel handover module, and the multichannel handover module links to each other with a plurality of ultrasonic transducers;
Said ultrasonic transducer and valve body lateral surface directly scribble acoustic coupling medium;
The ultrasound detection control of said intelligent controller is meant ultrasonic transducer is linked to each other with the multichannel handover module, starts CPU module work; The CPU module follow procedure is at first controlled the multichannel handover module and is connected a certain ultrasonic transducer; Starting the ultrasound emission module then sends electric signal and is added on this ultrasonic transducer; The ultrasonic pulse that this ultrasonic transducer is excited to produce gets into the valve wall through acoustic coupling medium and propagates therein; Gap location between valve wall and spool, because the hydraulic oil in the gap is different with the acoustic impedance of valve wall, ultrasound wave produces emission at gap location; The partial reflection energy returns this ultrasonic transducer along former incident approach; This ultrasonic transducer changes it into electric pulse again, and this electric impulse signal is input to the high-speed a/d modular converter after through echoed signal filtering amplification module and converts digital quantity into and send to CPU module, and the reflection wave electric pulse record that CPU module will be gathered is also preserved;
The amplitude output control of said intelligent controller; Be meant CPU module 1 follow procedure of intelligent controller; At first with the back wave electric pulse of record and preservation in the ultrasound detection control of intelligent controller, as the burst of this monitoring point, next is based on hydraulic valve and ultrasound parameter; Calculate the echo position in gap between spool valve wall, at last based on the signal amplitude of the corresponding amplitude in this positional information extraction burst as this monitoring point;
The detection output control of said intelligent controller; Be meant CPU module 1 follow procedure of intelligent controller; Reflection wave electric pulse with record and preservation in the ultrasound detection control of intelligent controller; Corresponding reference signal amplitude is compared during with this monitoring point chucking operating mode after the amplitude-frequency analyzing and processing, draws the gripping orientation information whether this monitoring point exists chucking fault and chucking fault light and heavy degree etc.
2. the detection and the localization method of a kind of hydraulic valve chucking fault as claimed in claim 1; It is characterized in that: in the said installation steps; A plurality of ultrasonic transducers are the even number more than six; Be divided into two rows, be parallel on adjacent two lateral surfaces that are installed in valve body of valve body internal valve cavity axis, each ultrasonic transducer on each side is uniformly-spaced arranged.
3. the detection and the localization method of a kind of hydraulic valve chucking fault as claimed in claim 2; It is characterized in that: also comprise positioning step, said positioning step is meant, when said detection step draws hydraulic valve existence chucking fault; The CPU module follow procedure of said intelligent controller; According to the comprehensive gripping orientation information that detects the monitoring point, a plurality of ultrasonic transducers place that is obtained in the step, obtain three-dimensional chucking information, the chucking position that can draw spool after comprehensive.
4. like the detection and the localization method of claim 1 or 2 or 3 described a kind of hydraulic valve chucking faults, it is characterized in that: said Frequency for Ultrasonic Energy Transducer is more than 10MHz.
5. like the detection and the localization method of claim 1 or 2 or 3 described a kind of hydraulic valves chucking faults; It is characterized in that: the A/D converter in the said intelligent controller high speed A/D modular converter is selected the A/D chip of ADS5485 or equal performance for use; Said ultrasonic transducer is selected normal probe for use, and said acoustic coupling medium is a machine oil.
6. the detection and the localization method of hydraulic valve chucking fault, hydraulic valve comprises spool and valve body, valve body comprises valve wall and valve pocket, it is characterized in that: comprise installation steps, demarcate the benchmark step and detect step, specific as follows:
Wherein installation steps are meant the lateral surface that a plurality of ultrasonic transducers is fixedly installed in hydraulic valve body, and the axis of the axial line of ultrasonic transducer and valve body internal valve cavity intersects vertically;
Wherein demarcate the benchmark step; Be meant hydraulic valve is adjusted to nominal situation; Be about to spool and adjust to the axis coincidence of spool and valve pocket; Through the ultrasound detection control of intelligent controller, and the amplitude of intelligent controller output control, the reference signal amplitude of correspondence when obtaining signal amplitude as monitoring point, particular ultrasound transducer place nominal situation; Hydraulic valve is adjusted to the chucking operating mode, control through the ultrasound detection of intelligent controller, and the amplitude of intelligent controller output control, the reference signal amplitude of correspondence when obtaining signal amplitude as monitoring point, particular ultrasound transducer place chucking operating mode; Repeat aforesaid operations, the complete reference signal amplitude when finally obtaining monitoring point, a plurality of ultrasonic transducers place nominal situation during with the chucking operating mode;
Wherein detect step; Be meant general operating mode to hydraulic valve; Through the ultrasound detection control of intelligent controller, and the detection of intelligent controller output control, the gripping orientation information whether this monitoring point exists chucking fault and chucking fault light and heavy degree etc. obtained; Repeat aforesaid operations; Whether the final monitoring point, a plurality of ultrasonic transducers place that obtains exists the comprehensive gripping orientation information that tightens fault and chucking fault light and heavy degree etc.; Handle through fuzzy algorithm, draw relevant hydraulic valve and whether exist the chucking of chucking fault and chucking fault light and heavy degree to detect conclusion;
Said intelligent controller comprises CPU module, high-speed a/d modular converter, echoed signal filtering amplification module, ultrasound emission module and multichannel handover module; CPU module links to each other with the high-speed a/d modular converter, but the echoed signal of processing collected; CPU module links to each other with the ultrasound emission module, and the may command ultrasonic pulse produces; CPU module links to each other with the multichannel handover module, is used in to switch ultrasound emission, reception object between a plurality of ultrasonic transducers; The ultrasound emission module links to each other with the multichannel handover module, and the high-speed a/d modular converter links to each other with echoed signal filtering amplification module, and echoed signal filtering amplification module links to each other with the multichannel handover module, and the multichannel handover module links to each other with a plurality of ultrasonic transducers;
Said ultrasonic transducer and valve body lateral surface directly scribble acoustic coupling medium;
The ultrasound detection control of said intelligent controller is meant ultrasonic transducer is linked to each other with the multichannel handover module, starts CPU module work; The CPU module follow procedure is at first controlled the multichannel handover module and is connected a certain ultrasonic transducer; Starting the ultrasound emission module then sends electric signal and is added on this ultrasonic transducer; The ultrasonic pulse that this ultrasonic transducer is excited to produce gets into the valve wall through acoustic coupling medium and propagates therein; Gap location between valve wall and spool, because the hydraulic oil in the gap is different with the acoustic impedance of valve wall, ultrasound wave produces emission at gap location; The partial reflection energy returns this ultrasonic transducer along former incident approach; This ultrasonic transducer changes it into electric pulse again, and this electric impulse signal is input to the high-speed a/d modular converter after through echoed signal filtering amplification module and converts digital quantity into and send to CPU module, and the reflection wave electric pulse record that CPU module will be gathered is also preserved;
The amplitude output control of said intelligent controller; Be meant CPU module 1 follow procedure of intelligent controller; At first with the back wave electric pulse of record and preservation in the ultrasound detection control of intelligent controller, as the burst of this monitoring point, next is based on hydraulic valve and ultrasound parameter; Calculate the echo position in gap between spool valve wall, at last based on the signal amplitude of the corresponding amplitude in this positional information extraction burst as this monitoring point;
The detection output control of said intelligent controller; Be meant CPU module 1 follow procedure of intelligent controller; Reflection wave electric pulse with record and preservation in the ultrasound detection control of intelligent controller; Corresponding reference signal amplitude is compared during with this monitoring point chucking operating mode after the amplitude-frequency analyzing and processing, draws the gripping orientation information whether this monitoring point exists chucking fault and chucking fault light and heavy degree etc.
7. the detection and the localization method of a kind of hydraulic valve chucking fault as claimed in claim 6; It is characterized in that: in the said installation steps; A plurality of ultrasonic transducers are the even number more than six; Be divided into two rows, be parallel on adjacent two lateral surfaces that are installed in valve body of valve body internal valve cavity axis, each ultrasonic transducer on each side is uniformly-spaced arranged.
8. the detection and the localization method of a kind of hydraulic valve chucking fault as claimed in claim 7; It is characterized in that: also comprise positioning step, said positioning step is meant, when said detection step draws hydraulic valve existence chucking fault; The CPU module follow procedure of said intelligent controller; According to the comprehensive gripping orientation information that detects the monitoring point, a plurality of ultrasonic transducers place that is obtained in the step, obtain three-dimensional chucking information, the chucking position that can draw spool after comprehensive.
9. like the detection and the localization method of claim 6 or 7 or 8 described a kind of hydraulic valve chucking faults, it is characterized in that: said Frequency for Ultrasonic Energy Transducer is more than 10MHz.
10. like the detection and the localization method of claim 6 or 7 or 8 described a kind of hydraulic valves chucking faults; It is characterized in that: the A/D converter in the said intelligent controller high speed A/D modular converter is selected the A/D chip of ADS5485 or equal performance for use; Said ultrasonic transducer is selected normal probe for use, and said acoustic coupling medium is a machine oil.
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| CN201210173996.7A CN102721536B (en) | 2012-05-31 | 2012-05-31 | Method for detecting and positioning clamping fault of hydraulic valve |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210173996.7A CN102721536B (en) | 2012-05-31 | 2012-05-31 | Method for detecting and positioning clamping fault of hydraulic valve |
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