CN102809486A - Driving mechanism of mute life testing machine of rolling bearing - Google Patents
Driving mechanism of mute life testing machine of rolling bearing Download PDFInfo
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- CN102809486A CN102809486A CN2012102822552A CN201210282255A CN102809486A CN 102809486 A CN102809486 A CN 102809486A CN 2012102822552 A CN2012102822552 A CN 2012102822552A CN 201210282255 A CN201210282255 A CN 201210282255A CN 102809486 A CN102809486 A CN 102809486A
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Abstract
The invention discloses a driving mechanism of a mute life testing machine of a rolling bearing. The driving mechanism comprises a driving motor, a testing central spindle, a front hydrostatic pressure main shaft unit and a rear hydrostatic pressure main shaft unit, wherein the front hydrostatic pressure main shaft unit and the rear hydrostatic pressure main shaft unit supply oil through a main shaft oil supply device separately installed with the driving mechanism; a rear end of the testing central spindle is sleeved on an inner diameter of an inner ring of the rolling bearing to be tested in a sliding mode; a front end of the testing central spindle is connected with a rear end of a rear main shaft through a Morse cone; and a front end of a front main shaft is in synchronous transmission connection with an output shaft of the driving motor. The driving mechanism has the advantages that: the testing machine is low in starting temperature, small in background vibration, small in vibration interference of the background vibration or external vibration to the rolling bearing to be tested, high in testing rotation speed, stable in rotation speed, large in testing load, high in driving precision and prolonged in driving precision service life; a radial internal clearance of the rolling bearing to be tested is not changed by connection of the driving mechanism and the inner ring of the rolling bearing to be tested, so that influence factors, such as an installation matching working condition of the inner ring of the rolling bearing to be tested to a testing result is eliminated.
Description
Technical field
The present invention relates to the driving mechanism of the quiet life test machine of a kind of rolling bearing.
Background technology
Since the World War II; The bearing vibration measuring equipment constantly comes out, like MGG11 bearing vibration measuring instrument, the S0910 bearing vibration accelerograph of Luoyang bearing research institute research and development and the BVT series bearing vibration speed measuring instrumentation of Hangzhou Bearing Experiment and Research Centre's research and development etc. of B1010 Andrew appearance of U.S. Bendix company, German FAG company.These instruments are measured to be rolling bearing in test state quiet quality (generally also being referred to as the vibrating noise quality on the document) down constantly with what estimate; Can not estimate the quiet life-span quality of tested rolling bearing, promptly tested rolling bearing still can keep satisfying the quiet quality level of request for utilization after running how long under this state.Rolling bearing (being the rolling bearing new product) is measured before dispatching from the factory preceding or using through above-mentioned instrument; Whether rolling bearing manufacturer produces a desired effect in order to estimate quiet quality, and can the rolling bearing user satisfy the installation requirement in order to estimate the quiet quality of this batch rolling bearing new product.That is to say that the test purpose of above-mentioned instrument is as the quiet quality assessment under the rolling bearing new product moment state, can't evaluate the quiet life-span quality of rolling bearing new product.Because the rolling bearing of different designs, unlike material, different process, different lubricant mediums, its quiet life-span is different, sometimes even differ greatly.If any the rolling bearing new product at the installation initial stage, its quiet quality can satisfy the quiet requirement of main frame, but operation long-time after; Along with the generation of rolling bearing insufficient lubrication, the increasing of rolling surface wearing and tearing; The vibrating noise of rolling bearing increases gradually, and quiet quality is variation gradually, and the main frame noise increases gradually; In the not long time, cause the main frame noise to exceed standard, i.e. the quiet end-of-life of rolling bearing; And the rolling bearing product that has, the quiet grade estimation result of (bearing new product) is basic identical with it before the installation, but installation just makes the main frame noise exceed standard after the operation long period, and promptly this quiet life-span of rolling bearing new product is longer.The factor that the quiet life-span length of rolling bearing is associated with the rolling bearing manufacturing mainly contains the life-span quality etc. of raw material quality, manufacturing process and filling lubricant medium of parameter designing, the part of rolling bearing inner structure.
At present; The rolling bearing user is in order to select long product of quiet life-span; The same model product that different manufacturers are produced pack into main frame or host part; Then main frame or host part are placed on start operation in the noise chamber, evaluate the length in quiet life-span of rolling bearing through the method that continues to monitor main frame or host part noise.Mainly there is the defective of three aspects in this method: the one, and what this method adopted is simulation or real working condition state, and the test period is longer, and experimentation cost is bigger.Because general rolling bearing is under applying working condition, especially to the higher air-conditioning of quiet quality requirements, office appliance class rolling bearing, its carrying is less; Under less loaded-up condition; Test period is very long, have in 1 year even more than several years, so experimentation cost is bigger; The 2nd, this method adopts the method for noise-measuring to evaluate the length in quiet life-span of rolling bearing, and noise-measuring is had relatively high expectations to environmental noise, and test can only be carried out in noise chamber, and the construction cost of noise chamber is bigger, causes experimentation cost bigger equally; The 3rd, this method adopts actual applying working condition state verification, and its evaluation result is only applicable to this work condition state, does not have versatility, is unwell to the manufacture process diagnosis or the product quality evaluation of rolling bearing manufacturer.Because the length of the quiet life test value of rolling bearing is except that with above-mentioned manufacturing factor is related; Also cooperate operating mode closely related, cooperate the quiet life-span of evaluating under the operating mode might not characterize the different quiet life-spans that cooperate under the operating mode at certain with Mounting of Rolling Contact Bearing.So concerning rolling bearing manufacturer, hope to have a kind ofly to cooperate the uncorrelated accelerated test procedures of operating mode with installing, be used for manufacture course of products and diagnose; Concerning the rolling bearing user, hope a kind of standard is arranged and test method fast, be used to the rolling bearing product of selecting quiet life-span quality higher.Cooperate the quiet life-span strenuous test of the uncorrelated rolling bearing of operating mode machine so exploitation is a kind of with installation, realize that the rapid evaluation in quiet life-span of rolling bearing is necessary.
Summary of the invention
In order to solve the problems referred to above in the quiet durability test machine technology of rolling bearing; The present invention provides the driving mechanism of the quiet life test machine of a kind of rolling bearing, use that the quiet life test machine of rolling bearing of this driving mechanism has that start-up temperature is low, the background vibration is little, background vibration or extraneous vibration to little by the vibration interference of examination rolling bearing, test speed is high, stabilization of speed, test load are big, drive precision high, drive long advantage accuracy life; Driving mechanism and the end-play that does not change by the examination rolling bearing that is connected that is tried rolling bearing inner ring are installed the influence of cooperation operating mode to test findings thereby eliminated by the examination rolling bearing inner ring simultaneously.
The present invention adopts following technical scheme:
The driving mechanism of the quiet life test machine of rolling bearing; Comprise drive motor, test mandrel, preceding fluid pressure main axle unit and back fluid pressure main axle unit, said before fluid pressure main axle unit and back fluid pressure main axle unit through separate the main shaft fueller fuel feeding of installation with driving mechanism; The fluid pressure main axle unit comprises first hydrodynamic journal liquid polymers and the forward spindle that is contained in first hydrodynamic journal liquid polymers before said; Said back fluid pressure main axle unit comprises second hydrodynamic journal liquid polymers and the back main shaft that is contained in second hydrodynamic journal liquid polymers; Said forward spindle is connected through spring coupling with the back main shaft; The rear end of said test mandrel is sleeved on by on the examination rolling bearing inner ring internal diameter with the sliding form of joining; Driving inner ring rotates synchronously; Test mandrel front end is connected with the back rear-end of spindle through the Mohs conical surface, and said forward spindle front end is connected with the output shaft synchrodrive of drive motor.
Forward and backward fluid pressure main axle unit adopts liquid static-pressure support, and forward and backward main shaft is suspended in the hydraulic oil before startup, thereby makes the start-up temperature of main shaft compare significantly reduction with the Hydrodynamic supporting, makes testing machine also can normally start use in non-constant temperature occasion.In the trial run process; Be full of one deck hydraulic oil between main shaft and fluid bearing; Hydraulic oil makes main shaft antivibration property good on the one hand; To testing machine background vibration vibrations such as () drive motor or extraneous vibration through main shaft to being had buffer action by the transmission of examination rolling bearing, thereby make vibration of testing machine background or extraneous vibration to less by the vibration interference of examination rolling bearing, make main shaft and fluid bearing not take place directly to contact on the other hand; Normal condition lower main axis and fluid bearing all can not be worn, thereby make main shaft longer accuracy life.
Said main shaft fueller separates installation with driving mechanism, has reduced the background vibration of driving mechanism.
Said forward spindle is connected through spring coupling with the back main shaft, and the moment in roll of forward spindle synchronous belt can be delivered on the main shaft of back, has improved the running accuracy of back main shaft, thereby has improved by the driving precision of examination rolling bearing.
Test mandrel front end is connected through the mohs tapered bore of the Mohs conical surface with the back rear-end of spindle.Morse's taper is used for stationary fit can accurately locate, because tapering is very little, utilizes conical surface friction power can transmit certain moment of torsion.And test load is through being delivered on the test mandrel shaft shoulder by examination housing washer, steel ball, inner ring, and the test mandrel is pressed on the main shaft of back with test load power all the time, makes the test mandrel in process of the test, remain tight the connection with the back main shaft.Because be cone match, can dismantle the test mandrel easily again, satisfy different size and tried the demand that rolling bearing test mandrel is convenient for changing.
Further, said first hydrodynamic journal liquid polymers comprise the preceding fluid pressure radial-thrust bearing and back fluid pressure radial-thrust bearing that is bearing in said forward spindle two ends; Said second hydrodynamic journal liquid polymers comprise the preceding fluid pressure transverse bearing that is bearing in main shaft two ends, said back and back fluid pressure transverse bearing and be installed in said before fluid pressure transverse bearing front end preceding fluid pressure axial thrust bearing and be installed in the back fluid pressure axial thrust bearing of fluid pressure transverse bearing rear end, said back.
Preferably; The thrust ring of the forward and backward fluid pressure radial-thrust bearing of said first hydrodynamic journal liquid polymers adopts the heavy wool cavity configuration; Have the strong advantage of anti-synchronous belt moment in roll, improved the running accuracy of forward and backward main shaft, thereby improved by the driving precision of examination rolling bearing; The forward and backward fluid pressure transverse bearing of said second hydrodynamic journal liquid polymers adopts no circumferential oil-recovery tank structure, has the advantage that suitable rotating speed is high, running accuracy is high, antivibration property is good, accuracy life is long; The forward and backward fluid pressure axial thrust bearing of said second hydrodynamic journal liquid polymers adopts annular single oil pocket structure; Has maximum axial carrying capacity; Can satisfy the requirement of strenuous test load; And the axial oil sealing surface of fluid pressure transverse bearing has been simplified the structure of preceding fluid pressure axial thrust bearing as flow controller before the preceding fluid pressure axial thrust bearing; The axial oil sealing surface of fluid pressure transverse bearing has been simplified the structure of back fluid pressure axial thrust bearing as flow controller after the back fluid pressure axial thrust bearing.
Preferably, said test mandrel is assigned in by on the examination rolling bearing inner ring internal diameter with the gap cunning of 2 μ m～15 μ m.This type of attachment can not change by the end-play of examination rolling bearing; Thereby make test findings and cooperated the operating mode onrelevant by the installation of examination rolling bearing inner ring; And can make by examination rolling bearing inner ring and test mandrel and do not produce relative slip, thereby make by the test speed of examination rolling bearing stable.Its gordian technique be the test mandrel with by the control of examination rolling bearing inner ring internal diameter tolerance clearance, can not be too little can not be too big, both guaranteed synchronous rotation, can slide again and join connection.
Preferably, said drive motor adopts synchronous motor, and be connected with can be to the frequency converter of drive motor stepless speed regulation.Synchronous motor has the strong advantage of reactance voltage fluctuation ability, thereby makes test speed stable.Utilize the frequency conversion of frequency converter can provide different model to be tried the required different rotating speeds of rolling bearing test.
Preferably, on the output shaft of said drive motor driving pulley is housed, said forward spindle front end is equipped with driven pulley, and driving pulley and driven pulley are in transmission connection through synchronous band.Band is in transmission connection and has guaranteed the stable of test speed synchronously.
Adopt the quiet life test machine of rolling bearing of this driving mechanism; Except that comprising the driving mechanism that drives the rolling bearing inner ring rotation; Also comprise and be connected the load maintainer that is used to provide test load on the examination housing washer, the sensor that detects quilt examination housing washer radial vibration signal; The output terminal of sensor connects the input end of signal amplification and processing mechanism; The output terminal of signal amplification and processing mechanism connects the input end of controller, and the output terminal of controller connects the feedback input end of said driving mechanism.Signal amplifies and processing mechanism be used for to amplified by the vibration signal of examination rolling bearing, mould/number conversion, filtering, calculating, comparison, analysis and record, monitoring test ruuning situation is sent stopping signal to controller simultaneously, and the output test result.
The quiet life test machine of above-mentioned rolling bearing is under the state of strenuous test load and strenuous test rotating speed; Through being tried the rolling bearing continuous running; Accumulative total according to being tried to be moved when the bearing vibration root-mean-square value increases to setting threshold is estimated by the length in examination quiet life-span of rolling bearing; Can estimate out within a short period of time the quiet life-span quality of the rolling bearing of different designs, unlike material, different process, different lubricant mediums, for the research and development of long quiet life-span rolling bearing, produce and select for use research technique and the method for providing.
The invention has the beneficial effects as follows: for the quiet life test machine of rolling bearing provides a kind of driving mechanism, make that testing machine has that test load is big, start-up temperature is low, the background vibration is little, background vibration or extraneous vibration to little by the vibration interference of examination rolling bearing, test speed is high, stabilization of speed, driving precision are high, drive long advantage accuracy life; Driving mechanism and being connected of quilt examination rolling bearing inner ring do not change the end-play that is tried rolling bearing, thereby eliminated inner ring the influence of cooperation operating mode to test findings are installed.
Description of drawings
Be described in further detail below in conjunction with the accompanying drawing specific embodiments of the invention.
Fig. 1 is the structural representation of the quiet life test machine of rolling bearing.
Fig. 2 is the structural representation of driving mechanism according to the invention.
Fig. 3 is the structural representation of load maintainer according to the invention.
Fig. 3 a is the structural representation of load posts described in the load maintainer of the present invention.
Fig. 4 is the installation diagram of the embodiment of the invention one said piezoelectric crystal acceleration type sensor.
Fig. 5 is that the vibration acceleration signal of the embodiment of the invention one amplifies and the processing block diagram.
Fig. 6 is the installation diagram of the embodiment of the invention two said magnetic induction velocity profile sensors.
Fig. 7 is that the vibration velocity signal of the embodiment of the invention two amplifies and the processing block diagram.
Wherein, the 1-signal amplifies and processing mechanism, 2-Data Control line, and the 3-controller, the 4-driving mechanism, 5-tests mandrel, and 6-is tried rolling bearing; The 7-load maintainer, 8-sensor, 81-piezoelectric crystal acceleration type sensor, 82-magnetic induction velocity profile sensor, fluid pressure radial-thrust bearing behind the 9-, main shaft behind the 10-; Fluid pressure transverse bearing before the 11-, fluid pressure axial thrust bearing before the fluid pressure transverse bearing behind the 111-, 12-, fluid pressure axial thrust bearing behind the 121-, fluid pressure main axle unit behind the 13-, 14-spring coupling; Fluid pressure main axle unit before the fluid pressure radial-thrust bearing before the 15-forward spindle, 16-, 17-, 18-is with synchronously, 19-drive motor, 20-frequency converter; 21-main shaft fueller, 22-handwheel, 23-screw rod, 24-T type nut, 25-load bar, 26-eccentric bushing; Guide block behind the 27-, 28-lock-screw, 29-slide plate, 30-loading spring, 31-preload nut, 32-leader block; 33-load dish, 34-load posts, 35-elastic washer, 36-singly join screw, 37-guide bearing, 38-base; 39-feed mechanism, 40-saddle type magnetic patch, 41-radially lock-screws, 42-radially gliding masses, 43-radially screw mechanisms, 44-axially gliding masses; 45-axial screw mechanism, 46-axial locking screw, 47-nut, 48-rear end metalwork, 49-rubber layer, 50-front end metalwork.
Embodiment
Embodiment one
With reference to Fig. 1: the quiet life test machine of rolling bearing; Comprise that driving is tried the driving mechanism 4 of rolling bearing 6 inner rings rotation, is connected the load maintainer 7 that is used to provide test load on examination rolling bearing 6 outer rings, the sensor 8 that detection is tried rolling bearing 6 outer ring radial vibration signals; The output terminal of sensor 8 connects the input end of signal amplification and processing mechanism 1; Signal amplifies and the output terminal of processing mechanism 1 passes through the input end that Data Control line 2 connects controllers 3, and the output terminal of controller 3 connects the feedback input end of said driving mechanism 4.
The quiet life test machine of rolling bearing is tried rolling bearing 6 under the immovable installment state of end-play; And continuous running under the situation of strengthening load and reinforcement rotating speed; Through continuing to monitor by the vibration root-mean-square value of examination rolling bearing 6, the accumulative total operation number when increasing to a certain setting threshold values according to the vibration root-mean-square value is evaluated by the length in examination 6 quiet life-spans of rolling bearing.So testing machine must possess following technical feature:
● the mounting means that is tried rolling bearing 6 should make its end-play not change;
● background vibration is little, the external world or background vibration be to little by the vibration interference of examination rolling bearing 6;
● test load is big, test speed is high and stabilization of speed;
● the driving precision is high, driving is long accuracy life.
With reference to Fig. 2: the driving mechanism 4 of the quiet life test machine of rolling bearing; Comprise drive motor 19, test mandrel 5, preceding fluid pressure main axle unit 17 and back fluid pressure main axle unit 13, said before fluid pressure main axle unit 17 and back fluid pressure main axle unit 13 through separate same main shaft fueller 21 fuel feeding of installation with driving mechanism 4; Fluid pressure main axle unit 17 comprises first hydrodynamic journal liquid polymers and the forward spindle 15 that is contained in first hydrodynamic journal liquid polymers before said; Said back fluid pressure main axle unit 13 comprises second hydrodynamic journal liquid polymers and the back main shaft 10 that is contained in second hydrodynamic journal liquid polymers; Said forward spindle 15 is connected through spring coupling 14 with back main shaft 10; The rear end of said test mandrel 5 is sleeved on by on the examination rolling bearing 6 inner ring internal diameters with the sliding form of joining; Driving inner ring rotates synchronously; Test mandrel 5 front ends are connected with main shaft 10 rear ends, back through the Mohs conical surface, and said forward spindle 15 front ends are connected with the output shaft synchrodrive of drive motor 19.Concrete, on the output shaft of said drive motor driving pulley being housed, said forward spindle front end is equipped with driven pulley, and driving pulley and driven pulley are through be with 18 to be in transmission connection synchronously.Band is in transmission connection and has guaranteed the stable of test speed synchronously.
Preceding fluid pressure main axle unit 17, back fluid pressure main axle unit 13 adopt liquid static-pressure supports; Make forward spindle 15 and back main shaft 10 before startup, be suspended in the hydraulic oil; Thereby the start-up temperature that makes main shaft is compared significantly with the Hydrodynamic supporting and is reduced, and makes testing machine also can normally start use in non-constant temperature occasion.In the trial run process; Be full of one deck hydraulic oil between main shaft and fluid bearing; Hydraulic oil makes main shaft antivibration property good on the one hand; To testing machine background vibration vibrations such as () drive motor or extraneous vibration through main shaft to being had buffer action by the transmission of examination rolling bearing 6, thereby make vibration of testing machine background or extraneous vibration to less by the vibration interference of examination rolling bearing 6, make main shaft and fluid bearing not take place directly to contact on the other hand; Normal condition lower main axis and fluid bearing all can not be worn, thereby make main shaft longer accuracy life.
Said main shaft fueller 21 separates installation with driving mechanism 4, only is connected with back fluid pressure main axle unit 13 with preceding fluid pressure main axle unit 17 with scavenge pipe with oil inlet pipe, and be in order to reduce the background vibration of driving mechanism 4.
Said forward spindle 15 is connected through spring coupling 14 with back main shaft 10, and the moment in roll of the synchronous belt 18 of forward spindle 15 can be delivered on the main shaft 10 of back, has improved the running accuracy of back main shaft 10, thereby has improved by the driving precision of examination rolling bearing 6.
Said first hydrodynamic journal liquid polymers comprise the preceding fluid pressure radial-thrust bearing 16 and back fluid pressure radial-thrust bearing 9 that is bearing in said forward spindle 15 two ends; Said second hydrodynamic journal liquid polymers comprise the preceding fluid pressure transverse bearing 11 that is bearing in main shaft 10 two ends, said back and back fluid pressure transverse bearing 111 and be installed in said before fluid pressure transverse bearing 11 front ends preceding fluid pressure axial thrust bearing 12 and be installed in the back fluid pressure axial thrust bearing 121 of fluid pressure transverse bearing 111 rear ends, said back.
The preceding fluid pressure radial-thrust bearing 16 of said first hydrodynamic journal liquid polymers adopts the heavy wool cavity configuration with the thrust ring of back fluid pressure radial-thrust bearing 9; Has the strong advantage of anti-synchronous belt moment in roll; Improved the running accuracy of forward spindle 15, back main shaft 10, thereby improved by the driving precision of examination rolling bearing 6; The preceding fluid pressure transverse bearing 11 of said second hydrodynamic journal liquid polymers, back fluid pressure transverse bearing 111 adopt no circumferential oil-recovery tank structure, have the advantage that suitable rotating speed is high, running accuracy is high, antivibration property is good, accuracy life is long; The preceding fluid pressure axial thrust bearing 12 of said second hydrodynamic journal liquid polymers adopts annular single oil pocket structure with back fluid pressure axial thrust bearing 121; Has maximum axial carrying capacity; Can satisfy the requirement of strenuous test load; And fluid pressure transverse bearing 11 axial oil sealing surfaces have been simplified the structure of preceding fluid pressure axial thrust bearing 12 as flow controller before the preceding fluid pressure axial thrust bearing 12; Fluid pressure transverse bearing 111 axial oil sealing surfaces have been simplified the structure of back fluid pressure axial thrust bearing 121 as flow controller after the back fluid pressure axial thrust bearing 121.
Said test mandrel 5 is assigned in by on the examination rolling bearing 6 inner ring internal diameters with the gap cunning of 2 μ m ~ 15 μ m.This type of attachment can not change by the end-play of examination rolling bearing 6; Thereby make test findings and cooperated the operating mode onrelevant by the installation of examination rolling bearing 6 inner rings; And can make by examination rolling bearing 6 inner rings and test mandrel 5 and do not produce relative slip, thereby make by the test speed of examination rolling bearing 6 stable.Its gordian technique be test mandrel 5 with by the control of examination rolling bearing 6 inner ring internal diameter tolerance clearances, can not be too little can not be too big, both guaranteed synchronous rotation, can slide again and join connection.
Said drive motor 19 adopts synchronous motors, and be connected with can be to the frequency converter 20 of drive motor 19 stepless speed regulations.Synchronous motor has the strong advantage of reactance voltage fluctuation ability, thereby makes test speed stable.Utilize the frequency conversion of frequency converter 20 can provide different model to be tried the required different rotating speeds of rolling bearing 6 tests.
With reference to Fig. 3: the load maintainer 7 of the quiet life test machine of rolling bearing comprises base 38 that slide plate 29, supporting plate 29 slide, is fixed on leader block 32 and back guide block 27 on the slide plate 29, is arranged in load bar 25 on leader block 32 and the back guide block 27, is sleeved on loading spring 30 on the load bar 25, slide plate 29 is compressed by the load posts 34 of examination rolling bearing 6 cycle surfaces and the load dish 33 that is connected load bar 25 and load posts 34 along the lock-screw of the axially movable feed mechanism of load bar 25 39, locking slide plate 29 axial locations 28, three.Said slide plate 29 and base 38 are connected through dovetail guide; The said load bar 25 middle parts preload nut 31 that has been threaded; Said loading spring 30 is butted between preload nut 31 and the back guide block 27; The rear end of the front end of said load bar 25 and load dish 33 is coiled 33 front ends against, load and is compressed by the cycle surface of examination rolling bearing 6 through load posts 34.Between leader block 32 and the load bar 25, between back guide block 27 and the load bar 25 straight line or sliding bearing 37 are housed all.Need to prove, the front end of above-mentioned load bar 25 towards, identical with loading spring 30 force direction to preload nut 31 under compressive state.Adopt spring-loaded to have the reliable and stable advantage of load, and load maintainer is had the advantage of no background vibration source, thereby improved accuracy of experimental results.
Said feed mechanism 39 is the screw rod feed mechanism; Said screw rod feed mechanism comprises the T type nut 24 and the eccentric bushing 26 of the handwheel 22 of rotating screw bolt 23, the screw rod 23 that is located in base 38 two ends, connecting screw rod 23 and slide plate 29; Handwheel 22 is fixedly connected with screw rod 23 rear ends; Screw rod 23 adopts acme thread to be connected with T type nut 24, and T type nut 24 is connected through eccentric bushing 26 with slide plate 29.Screw rod 23 and T type nut 24 adopts acme threads to be connected to have the advantage that self-locking performance is good, driving force is big, satisfy the requirement that test load is big and load is stable.T type nut 24 is connected through eccentric bushing 26 with slide plate 29, can eliminate phenomenons such as the not parallel and screw rod that causes 23 rotations of screw rod 23 axial lines and dovetail guide slip center line are dumb, stuck.
The front end of said load bar 25 is arranged to sphere, and the centre of sphere designs on the axial line of load bar, and the rear end of load dish 33 is provided with the conical surface that cooperates with this sphere, and the vertex of a cone design of the conical surface is on the central axis of load dish.Load bar 25 spheres coil 33 conical surfaces with load and contact, and when the loading force of three load posts is inhomogeneous (when unbalance loading takes place), the contact sphere can be adjusted to the loading force of three load posts evenly automatically, and promptly test load has the automatic aligning function.
With reference to Fig. 3 a: said load posts 34 comprises front end metalwork 50, rear end metalwork 48, is filled in the rubber layer 49 between front end metalwork 50 and the rear end metalwork 48 and is connected the nut 47 on the rear end metalwork 48.Front end metalwork 50 makes load posts 34 can satisfy the requirement of transmitting big test load with rear end metalwork 48; Middle rubber layer 49 of filling can isolate the external world or the vibration of testing machine background is delivered to by the vibration interference of examination rolling bearing 6 through load maintainer 7, thereby has improved accuracy of experimental results.
Said load posts 34 has three; The front end of said load dish 33 is provided with three radially T type chutes; Three radially the center line of T type chute intersect on the central axis of load dish; Three load posts can be respectively radially slide on the T type chute and fix at three, and three load posts are evenly distributed on the center circumferential of load dish 33.According to 3 definite plane principles, three load posts that circumferentially are uniformly distributed with 34 can make by the even stand under load in examination rolling bearing 6 outer rings.Three radially the center line of T type chute intersect on the central axis of load dish, guaranteed that three load posts can be evenly distributed on the center circumferential of load dish.After nut 47 on the load posts 34 rear end metalworks 48 is unscrewed; Nut 47 radially T type chute drive load posts 34 slides; After nut 47 was tightened, load posts 34 centers just were fixed on a certain radial position on the T type chute, and such three load posts are with the adjustable mode connected load dish 33 of radial position; Load posts 34 centers are adjusted to by the center of examination rolling bearing 6 outer ring thickness, and can make a load dish 33 can satisfy the requirement of different model rolling bearing test.
Said load bar 25 front end spheres coil the 33 rear end conical surfaces with load and are connected with elastic washer 35 through singly joining screw 36, and said elastic washer 35 is contained in singly joins between screw 36 and the load dish 33.Singly join the elasticity with elastic washer 35 through what singly join screw 36 length; Make load coil 33 conical surfaces and load bar 25 spheres more closely link together; Transverse plane is roughly parallel to by examination rolling bearing 6 cycle surfaces before making three load posts, makes things convenient for the laboratory technician exactly load posts 34 centers to be adjusted to by examination mid-depth position, rolling bearing 6 outer ring, and; When the loading force of three load posts was inhomogeneous, the contact friction moment of the conical surface and sphere was unlikely to have influence on the aligning function.
The loading principle of above-mentioned load maintainer 7 is following: through rotating the screw rod 23 of handwheel 22 rotary screw feed mechanisms, the axial feed of realizing slide plate 29 with return, and then the axial feed that drives leader block 32, back guide block 27 with return; Axial location through lock-screw 28 locking slide plates 29 and leader block 32, back guide block 27 makes test load in process of the test, avoid rotating or loosening changing because of handwheel 22, screw rod 23 etc. are unusual, influences accuracy of experimental results.Suit loading spring 30 on the load bar 25, and the preload nut 31 that has been threaded at the middle part are through the pretightning force that preload nut 31 is regulated loading springs 30, the bulk that can dwindle load maintainer 7.Course of action is: at first rotate handwheel 22 rotary screws 23; Making T type nut 24 promote slide plate 29 through eccentric bushing 26 moves forward together with leader block 32, back guide block 27, load bar 25, loading spring 30, preload nut 31, load dish 33, load posts 34; When load posts 34 front end faces near but the handwheel 22 that stops operating when not propping up as yet by examination rolling bearing 6 cycle surfaces; Unscrew the nut 47 of three load posts rear ends; Two opposite side that make nut 47 radially T type chute drive load posts 34 and slide; When load posts 34 centrally aligneds were tried the center of rolling bearing 6 outer ring thickness, fastening nut 47 was fixed on by on the center circle of examination rolling bearing 6 outer ring thickness three load posts centers.And then rotation handwheel 22; Load posts 34 front end faces are propped up by examination rolling bearing 6 cycle surfaces; And be rotated further handwheel 22, then load posts 34, load dish 33, load bar 25, preload nut 31 move no longer forward, and slide plate 29 continues to move forward together with forward and backward guide block 32 and 27; Back guide block 27 continues compression-loaded spring 30 under condition of preload, spring force affacts by on examination rolling bearing 6 cycle surfaces through preload nut 31, load bar 25, load dish 33, load posts 34.Be rotated further handwheel 22, reach test load, the lock-screw 28 of screwing again, the position of locking slide plate 29 and leader block 32, back guide block 27 until spring force.Like this; Load maintainer 7 is applied to test load by on examination rolling bearing 6 cycle surfaces through back guide block 27, loading spring 30, preload nut 31, load bar 25, load dish 33 and load posts 34; Make and tried rolling bearing 6 when the inner ring high speed rotating; The outer ring is fixing does not change, and promptly the fixing of outer ring do not change by the end-play of examination rolling bearing 6, thereby eliminated the outer ring influence of cooperation operating mode to test findings is installed.
The sensor 8 that present embodiment one adopts is a piezoelectric crystal acceleration type sensor 81; Its installation diagram is seen Fig. 4; Piezoelectric crystal acceleration type sensor 81 is fixed on the saddle type magnetic patch 40 through the screw thread rigidity, and saddle type magnetic patch 40 is adsorbed on by examination rolling bearing 6 outer rings in the radial direction.Piezoelectric crystal acceleration type sensor 81 induction tried rolling bearing 6 outer ring radial vibration acceleration, the output terminal of piezoelectric crystal acceleration type sensor 81 is connected with the input end of signal amplification and processing mechanism 1.
Among Fig. 5, the comparing unit that said signal amplifies and processing mechanism 1 comprises the signal amplification unit that the charge signals with being directly proportional by examination bearing vibration acceleration of piezoelectric crystal acceleration type sensor 81 outputs is amplified and convert to voltage signal that connects successively, the data acquisition unit that is used for mould/number conversion, digital signal filter is become the digital filtering unit of 50Hz ~ 10000Hz single-band signal, the single-band signal is carried out root-mean-square value computing unit that root-mean-square value calculates, the vibration acceleration threshold value of single-band root-mean-square value that calculates and setting is compared.When single-band root-mean-square value during stably greater than setting threshold; Then judge by examination rolling bearing 6 quiet end-of-lifes; Comparing unit sends the test command for stopping to controller 3, described driving mechanism 4 stalls of controller 3 controls, and testing machine is shut down; Controller 3 writes down simultaneously, output test information and test findings, and Test Information comprises testpieces information, test load, test speed, startup-shutdown time, accumulated running time and moves ten thousand revolutions, vibration root-mean-square value database and set threshold values etc.; If the single-band root-mean-square value is less than setting threshold, comparing unit sends test to controller 3 and continues instruction, and controller 3 controlling and driving mechanisms 4 remain in operation.Come out frequency range, frequency band number, the frequency band range of signal of digital filtering unit filtering can be adjusted as required.
Present embodiment is under the state of strenuous test load and strenuous test rotating speed; Through by 6 continuous runnings of examination rolling bearing, estimate by the length in examination 6 quiet life-spans of rolling bearing according to the accumulative total that is tried to be moved when the bearing vibration root-mean-square value increases to setting threshold.Need to prove that among this paper, " the vibration root-mean-square value is stably greater than setting threshold " is meant by examination rolling bearing 6 and vibrates continuous a period of times of root-mean-square value all greater than setting threshold.Be somebody's turn to do the length of " a period of time continuously ", can adjust and set, vibrated root-mean-square values greater than setting threshold by examination rolling bearing 6 with reliable evaluation according to situation such as vibration of testing machine background or ambient vibration interference.And " threshold value " can be according to bearing user's request for utilization, or is preestablished by the vibration root-mean-square value at examination 6 initial stages on-test of rolling bearing.
Embodiment two
Embodiment two is with the difference of embodiment one: the sensor 8 that embodiment two adopts is magnetic induction velocity profile sensor 82.Its installation diagram is referring to Fig. 6; Magnetic induction velocity profile sensor 82 is installed on the radially gliding mass 42 of sensor adjusting mechanism; Radially gliding mass 42 is connected with axial gliding mass 44 rear ends through guide rail; Through regulating radially screw mechanism 43 and axial screw mechanism 45, the gauge head that makes magnetic induction velocity profile sensor 82 is contacted with by examination rolling bearing 6 outer ring external diameters 1/2 width position place with a certain size contact force.The gauge head contact force of magnetic induction velocity profile sensor 82 can not be too small, in order to avoid the vibration signal frequency is when higher, gauge head with broken away from the vibration signal distortion that magnetic induction velocity profile sensor 82 is picked up by examination rolling bearing 6 outer rings.The gauge head contact force of magnetic induction velocity profile sensor 82 again can not be excessive, in order to avoid to being produced constraint, the vibration signal distortion that magnetic induction velocity profile sensor 82 is picked up by the free vibration of examination rolling bearing 6 outer rings.But the gauge head contact force of screw mechanism 43 minute adjustment magnetic induction velocity profile sensors 82 radially, the contact force of present embodiment is 0.3N～0.6N.After magnetic induction velocity profile sensor 82 probe location and contact force are adjusted to the right place; Through the radially fixedly radial position of magnetic induction velocity profile sensor 82 gauge heads of lock-screw 41, through the fixing axial location of magnetic induction velocity profile sensor 82 gauge heads of axial locking screw 46.The rolling bearing 6 outer ring radial vibration speed of being tried of magnetic induction velocity profile sensor 82 inductions, the output terminal of magnetic induction velocity profile sensor 82 amplifies with signal and the input end of processing mechanism 1 is connected.
Referring to Fig. 7: signal amplifies and processing mechanism 1 at first amplifies the voltage signals with being directly proportional by examination rolling bearing 6 radial vibration speed of magnetic induction velocity profile sensor 82 outputs through signal amplification unit; Through data acquisition unit analog signal conversion is become digital signal again; Through the digital filtering unit, the vibration velocity digital signal filter is become three band signals of 50Hz ~ 300Hz, 300Hz ~ 1800Hz and 1800Hz ~ 10000Hz then; Each band signal warp root-mean-square value computing unit separately calculates each frequency band root-mean-square value, and passes through comparing unit separately; Compare with predefined vibration velocity threshold value separately; When the vibration root-mean-square value of some or certain several frequency band during, judge that then comparing unit sends the test command for stopping to controller 3 by examination rolling bearing 6 quiet end-of-lifes stably greater than corresponding frequency band pre-set threshold; Described driving mechanism 4 stalls of controller 3 controls; Testing machine is shut down, and controller 3 writes down simultaneously, output test information and test findings, and the content of Test Information is with embodiment one.If all less than the setting threshold of correspondence, then comparing unit sends test continuation instruction to controller 3 to each frequency band root-mean-square value, controller 3 controlling and driving mechanisms 4 remain in operation.
Claims (6)
1. the driving mechanism of the quiet life test machine of rolling bearing; It is characterized in that: comprise drive motor, test mandrel, preceding fluid pressure main axle unit and back fluid pressure main axle unit, said before fluid pressure main axle unit and back fluid pressure main axle unit through separate the main shaft fueller fuel feeding of installation with driving mechanism; The fluid pressure main axle unit comprises first hydrodynamic journal liquid polymers and the forward spindle that is contained in first hydrodynamic journal liquid polymers before said; Said back fluid pressure main axle unit comprises second hydrodynamic journal liquid polymers and the back main shaft that is contained in second hydrodynamic journal liquid polymers; Said forward spindle is connected through spring coupling with the back main shaft; The rear end of said test mandrel is sleeved on by on the examination rolling bearing inner ring internal diameter with the sliding form of joining; Driving inner ring rotates synchronously; Test mandrel front end is connected with the back rear-end of spindle through the Mohs conical surface, and said forward spindle front end is connected with the output shaft synchrodrive of drive motor.
2. the driving mechanism of the quiet life test machine of rolling bearing as claimed in claim 1 is characterized in that: said first hydrodynamic journal liquid polymers comprise the preceding fluid pressure radial-thrust bearing and back fluid pressure radial-thrust bearing that is bearing in said forward spindle two ends; Said second hydrodynamic journal liquid polymers comprise the preceding fluid pressure transverse bearing that is bearing in main shaft two ends, said back and back fluid pressure transverse bearing and be installed in said before fluid pressure transverse bearing front end preceding fluid pressure axial thrust bearing and be installed in the back fluid pressure axial thrust bearing of fluid pressure transverse bearing rear end, said back.
3. the driving mechanism of the quiet life test machine of rolling bearing as claimed in claim 2 is characterized in that: the thrust ring of the forward and backward fluid pressure radial-thrust bearing of said first hydrodynamic journal liquid polymers adopts the heavy wool cavity configuration; The forward and backward fluid pressure transverse bearing of said second hydrodynamic journal liquid polymers adopts no circumferential oil-recovery tank structure; The forward and backward fluid pressure axial thrust bearing of said second hydrodynamic journal liquid polymers adopts annular single oil pocket structure; The axial oil sealing surface of fluid pressure transverse bearing was as flow controller before the preceding fluid pressure axial thrust bearing, and the axial oil sealing surface of fluid pressure transverse bearing is as flow controller after the back fluid pressure axial thrust bearing.
4. the driving mechanism of the quiet life test machine of rolling bearing as claimed in claim 3 is characterized in that: said test mandrel is assigned in by on the examination rolling bearing inner ring internal diameter with the gap cunning of 2 μ m ~ 15 μ m.
5. the driving mechanism of the quiet life test machine of rolling bearing as claimed in claim 1 is characterized in that: said drive motor is a synchronous motor, and be connected with can be to the frequency converter of drive motor stepless speed regulation.
6. the driving mechanism of the quiet life test machine of rolling bearing as claimed in claim 1; It is characterized in that: on the output shaft of said drive motor driving pulley is housed; Said forward spindle front end is equipped with driven pulley, and driving pulley and driven pulley are in transmission connection through synchronous band.
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| CN110230642A (en) * | 2018-03-06 | 2019-09-13 | 华中科技大学 | A kind of new liquid hydrostatic thrust bearing device |
| CN111929013A (en) * | 2020-08-06 | 2020-11-13 | 太原理工大学 | Bending boundary condition experiment system under lateral impact effect |
| CN112152380A (en) * | 2020-09-22 | 2020-12-29 | 安徽新诺精工股份有限公司 | Machining center spindle motor connecting plate |
| CN113834659A (en) * | 2021-11-29 | 2021-12-24 | 山东凤鸣新材料有限公司 | Vibration speed testing device for bearing |
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| CN113834659A (en) * | 2021-11-29 | 2021-12-24 | 山东凤鸣新材料有限公司 | Vibration speed testing device for bearing |
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Application publication date: 20121205 |