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CN202720123U - Loading Mechanism of Rolling Bearing Quiet Life Tester - Google Patents

Loading Mechanism of Rolling Bearing Quiet Life Tester Download PDF

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Publication number
CN202720123U
CN202720123U CN2012203934724U CN201220393472U CN202720123U CN 202720123 U CN202720123 U CN 202720123U CN 2012203934724 U CN2012203934724 U CN 2012203934724U CN 201220393472 U CN201220393472 U CN 201220393472U CN 202720123 U CN202720123 U CN 202720123U
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CN
China
Prior art keywords
load
rolling bearing
slide plate
loading
test
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CN2012203934724U
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Chinese (zh)
Inventor
陈芳华
张根源
陆水根
张斌
卓继志
李慧光
陈掌娥
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Zhejiang University of Media and Communications
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Zhejiang University of Media and Communications
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Abstract

The utility model relates to a loading mechanism of a rolling bearing mute life tester. The loading mechanism comprises a slide plate, a pedestal which supports sliding of the slide plate, a front guide block, a rear guide block, a loading rod, a loading spring, a feeding mechanism, a locking screw, a load column and a load disc, wherein the front guide block and the rear guide block are fixed on the slide plate; the loading rod passes through the front guide block and the rear guide block; the loading spring is sleeved on the loading rod; the feeding mechanism makes the slide plate carry out axial movement along the loading rod; the locking screw locks an axial direction position of the slide plate; the load column presses an outer ring end surface of the tested rolling bearing; the load disc is used to connect the loading rod and the load column. A central thread of the loading rod is connected with a preloading nut. The loading spring is abutted between the preloading nut and the rear guide block. A front end of the loading rod abuts a rear end of the load disc. The front end of the load disc presses the outer ring end surface of the tested rolling bearing through the load column. The mechanism of the utility model has the following advantages that a test load of the rolling bearing mute life tester is stable and reliable; the load possesses a self-aligning function so that outer ring end surface loading of the tested rolling bearing is uniform and unbalance loading is not generated.

Description

The load maintainer of the quiet life test machine of rolling bearing
Technical field
The utility model relates to the load maintainer of the quiet life test machine of a kind of rolling bearing.
Background technology
Since World War II, the bearing vibration measuring equipment constantly comes out, as 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 instrument of U.S. Bendix company, German FAG company.These instruments are measured and what estimate is rolling bearing in the test quiet quality (also being referred to as the vibrating noise quality on general document) under state constantly, can not estimate the quiet serving span of tested rolling bearing, namely 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 or before using by 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, the test purpose of above-mentioned instrument is as the quiet quality assessment under rolling bearing new product moment state, can't be evaluated the quiet serving span 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 differs 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 after operation is not long-time, increasing along with the bad generation of rolling bearing lubrication, 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, cause the main frame noise to exceed standard within the not long time, i.e. the quiet end-of-life of rolling bearing; And some rolling bearing products, before installation, the quiet grade estimation result of (bearing new product) is basic identical with it, but installation just makes the main frame noise exceed standard after the operation long period, and namely 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 serving span 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 noise chamber, evaluate the length in quiet life-span of rolling bearing by the method that continues to monitor main frame or host part noise.Mainly there is the defective of three aspects: in the method: the one, and what the method adopted is simulation or real working condition state, and the test period is longer, and experimentation cost is larger.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 1 year, even more than several years, therefore experimentation cost is larger; The 2nd, the 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 larger, causes equally experimentation cost larger; The 3rd, the 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 manufacture process diagnosis or the marking product quality of rolling bearing manufacturer.Because the length of the quiet life test value of rolling bearing is except with above-mentioned manufacturing factor is related, also coordinate operating mode closely related with the installation of rolling bearing, coordinate the quiet life-span of evaluating under operating mode might not characterize the different quiet life-spans that coordinate under operating mode at certain.Therefore concerning rolling bearing manufacturer, wish and a kind ofly coordinate the uncorrelated accelerated test procedures of operating mode with installing, be used for manufacture course of products and diagnose; Concerning the rolling bearing user, wish a kind of standard and test method fast, be used for selecting the higher rolling bearing product of quiet serving span.A kind ofly coordinate the quiet life-span strenuous test of the uncorrelated rolling bearing of operating mode machine with installing therefore develop, to realize that the rapid evaluation in quiet life-span of rolling bearing is necessary.
The utility model content
In order to solve the problems referred to above in the quiet durability test machine technology of rolling bearing, the utility model provides the load maintainer of the quiet life test machine of a kind of rolling bearing, make the test load of testing machine reliable and stable, load has the Self-aligning function, can make tested housing washer end face stand under load even, unbalance loading does not occur; Load maintainer is without vibration source, and can isolate the external world or the vibration of testing machine background is delivered to the vibration interference of tested rolling bearing by load maintainer; The fixed form of outer ring can not make the end-play of tested rolling bearing change, thereby the outer ring installation coordinates operating mode can not exert an influence to test findings.
The utility model adopts following technical scheme:
the load maintainer of the quiet life test machine of rolling bearing, comprise slide plate, the base that supporting plate slides, be fixed on leader block and rear guide block on slide plate, be arranged in the load bar on leader block and rear guide block, be sleeved on the loading spring on load bar, make slide plate along the axially movable feed mechanism of load bar, the latch mechanism of locking slide plate axial location, compress the load posts of tested housing washer end face, and the load dish that connects load bar and load posts, the preload nut has been threaded in the middle part of described load bar, described loading spring is butted between preload nut and rear guide block, the rear end of the front end of described load bar and load dish against, load dish front end compresses the cycle surface of tested rolling bearing by load posts.Need to prove, the front end of above-mentioned load bar towards, identical with loading spring force direction to the preload nut under compressive state.The employing spring loads has advantages of that load is reliable and stable, and load maintainer is had advantages of without the background vibration source, thereby has improved the accuracy of test findings.
Further, described feed mechanism is the screw rod feed mechanism, described screw rod feed mechanism comprises T-shaped nut and the eccentric bushing of the handwheel of rotary screw, the screw rod that is located in the base two ends, connecting screw rod and slide plate, described handwheel is fixedly connected with spiro rod rear end, screw rod adopts acme thread to be connected with T-shaped nut, and T-shaped nut is connected by eccentric bushing with slide plate.Screw rod adopts acme thread to be connected with T-shaped nut to have advantages of that self-locking performance is good, driving force is large, can satisfy the requirement that test load is large and load is stable.T-shaped nut is connected by eccentric bushing with slide plate, can eliminate the phenomenons such as the not parallel and bolt rotary that cause of screw rod axial line and dovetail guide slip center line is dumb, stuck.
Preferably, the front end of described load bar is arranged to sphere, and the centre of sphere designs on the axial line of load bar, and the rear end of load dish is provided with the conical surface that coordinates with this sphere, and the vertex of a cone design of the conical surface is on the central axis of load dish.The load bar sphere contacts with the load dish conical surface, and when the loading force of three load posts is inhomogeneous (when unbalance loading occurs), the contact sphere can be adjusted to the loading force of three load posts evenly automatically, and namely test load has self-aligning function.
Further again, described load posts comprises front end metalwork, rear end metalwork, be filled in the rubber layer between front end metalwork and rear end metalwork and be connected to nut on the metalwork of rear end.The load posts that makes the metalwork at two ends can satisfy the requirement of transmitting larger test load, and middle rubber layer of filling can isolate the external world or the vibration of testing machine background is delivered to the vibration interference of tested rolling bearing by load maintainer.
Further, described load posts has three, the front end of described load dish is provided with three radially T-shaped chutes, three radially the center line of T-shaped chute intersect on the central axis of load dish, three load posts can slide and fix on three radially T-shaped chutes respectively, and three load posts are evenly distributed on the center circumferential of load dish.According to 3 definite plane principles, three circumferential uniform load posts can make the even stand under load in outer ring of tested rolling bearing.Three radially the center line of T-shaped 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 on the metalwork of load posts rear end is unscrewed, two opposite side of nut can radially T-shaped chute drive load posts slide, after nut screwing clamping, the load posts center just is fixed on a certain radial position on T-shaped chute, such three load posts are with the adjustable mode connected load dish of radial position, can make the load posts center be adjusted to tested housing washer mid-depth position, and can make a load dish can satisfy the requirement of different model rolling bearing test.
Preferably, described load bar front end sphere is connected by singly joining screw with the load back-end disk conical surface, and described singly joining between screw and load dish is equipped with elastic washer.Singly join elasticity with elastic washer by what singly join screw length, the load dish conical surface was both more closely linked together with the load bar sphere, before making three load posts, transverse plane is roughly parallel to tested housing washer end face, facilitate the laboratory technician exactly the load posts center to be adjusted to tested housing washer mid-depth position, 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 aligning function.
Preferably, described slide plate is connected by dovetail guide with base.
Preferably, described latch mechanism is lock-screw.
Technical conceive of the present utility model is: by rotating the screw rod of handwheel rotary screw feed mechanism, realize the axial feed of slide plate and return, drive the axial feed of leader block and rear guide block and return; Lock the axial location of slide plate and leader block, rear guide block by lock-screw, make test load avoid rotating because handwheel, screw rod etc. are abnormal or loosening changing in process of the test, affect the stability of test load.Be set with loading spring on load bar, and the preload nut that has been threaded at the middle part, regulate by the preload nut bulk that the pretightning force of loading spring can be dwindled load maintainer.course of action is: at first rotate the handwheel rotary screw, make T-shaped nut promote slide plate together with leader block by eccentric bushing, rear guide block, load bar, loading spring, the preload nut, the load dish, load posts moves forward, handwheel stops operating when the load posts front end face approaches but not yet props up tested housing washer end face, unscrew three nuts on the metalwork of load posts rear end, the radially T-shaped chute drive of the two opposite side load posts of nut is slided, when the center of the tested housing washer thickness of load posts centrally aligned, fastening nut, three load posts centers are fixed on tested housing washer mid-depth circle.And then rotation handwheel, make the load posts front end face prop up tested housing washer end face, and be rotated further handwheel, load posts, load dish, load bar, preload nut move no longer forward, and slide plate continues to move forward together with leader block, rear guide block, rear guide block continues the compression-loaded spring under condition of preload, spring force is applied on tested housing washer end face by preload nut, load bar, load dish, load posts.Be rotated further handwheel, until spring force reaches required test load, then screws lock-screw, the position of locking slide plate and leader block, rear guide block.Like this, load maintainer is applied to test load on tested housing washer end face by rear guide block, loading spring, preload nut, load bar, load dish and load posts, make tested rolling bearing when the inner ring High Rotation Speed, the outer ring maintains static, the fixed form that is the outer ring does not change the end-play of tested rolling bearing, the cooperation operating mode is installed on the impact of test findings thereby eliminated the outer ring.
Adopt the quiet life test machine of rolling bearing of above-mentioned load maintainer, be connected to the load maintainer that test load is provided on tested housing washer except comprising, also comprise the driving mechanism that drives tested rolling bearing inner ring rotation, detect the sensor of tested 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 described driving mechanism.Signal amplifies and processing mechanism be used for to signal amplify, mould/number conversion, filtering, calculating, comparison, analysis and record, monitoring test ruuning situation, send 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, by tested rolling bearing continuous running, the accumulative total that moves when stably increasing to setting threshold according to tested bearing vibration root-mean-square value is estimated the length in tested quiet life-span of rolling bearing, can estimate out within a short period of time the quiet serving span 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 research technique and the method for providing.
The beneficial effects of the utility model are: for the quiet life test machine of rolling bearing provides a kind of load maintainer, make testing machine test load reliable and stable, load has the Self-aligning function, can make tested housing washer end face stand under load even, and unbalance loading does not occur; Load maintainer is without vibration source, and can isolate the external world or the vibration of testing machine background is delivered to the vibration interference of tested rolling bearing by load maintainer; The fixed form of outer ring can not make the end-play of tested rolling bearing change, thereby the outer ring installation coordinates operating mode can not exert an influence to test findings.
Description of drawings
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail.
Fig. 1 is the structural representation of the quiet life test machine of rolling bearing.
Fig. 2 is the structural representation of load maintainer described in the utility model.
Fig. 3 is the structural representation of the load posts described in the utility model load maintainer.
Fig. 4 is the structural representation of driving mechanism described in the utility model.
The installation diagram of the described piezoelectric crystal acceleration type sensor of Fig. 5 the utility model embodiment one.
The vibration acceleration signal of Fig. 6 the utility model embodiment one amplifies and the processing block diagram.
The installation diagram of Fig. 7 the utility model embodiment two described magnetic induction quality test of piles.
Fig. 8 the utility model embodiment two vibration velocity signals amplify and the processing block diagram.
wherein, 1-signal amplifies and processing mechanism, 2-Data Control line, 3-controller, 4-driving mechanism, 5-test mandrel, 6-tested rolling bearing, 7-load maintainer, 8-sensor, 81-piezoelectric crystal acceleration type sensor, 82-magnetic induction quality test of pile, 9-rear fluid pressure radial-thrust bearing, 10-rear main shaft, 11-front fluid pressure transverse bearing, 111-rear fluid pressure transverse bearing, 12-front fluid pressure axial thrust bearing, 121-rear fluid pressure axial thrust bearing, 13-rear hydraulic static spindle unit, 14-spring coupling, 15-forward spindle, 16-front fluid pressure radial-thrust bearing, 17-front hydraulic static spindle unit, 18-Timing Belt, 19-drive motor, 20-frequency converter, 21-main shaft fueller, 22-handwheel, 23-screw rod, 24-T-shaped nut, 25-load bar, 26-eccentric bushing, 27-rear guide block, 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 the driving mechanism 4 that drives tested rolling bearing 6 inner rings rotations, be connected to the load maintainer 7 that is used for providing test load on tested rolling bearing 6 outer rings, the sensor 8 that detects tested 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 connects the input end of controller 3 by Data Control line 2, and the output terminal of controller 3 connects the feedback input end of described driving mechanism 4.
The quiet life test machine of rolling bearing is that tested rolling bearing 6 is under the immovable installment state of end-play, and continuous running under the situation of strengthening load and reinforcement rotating speed, by continuing to monitor the vibration root-mean-square value of tested 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 the length in tested 6 quiet life-spans of rolling bearing.Therefore testing machine must possess following technical feature:
● the mounting means of tested rolling bearing 6 should make its end-play not change;
● background vibration is little, the external world or the background vibration little to the vibration interference of tested rolling bearing 6;
● test load should be applied on the cycle surface of tested rolling bearing 6 stably, equably, and the situations such as unbalance loading, fluctuation do not occur.
With reference to Fig. 2: the load maintainer 7 of the quiet life test machine of rolling bearing, comprise base 38 that slide plate 29, supporting plate 29 slide, be fixed on slide plate 29 leader block 32 be connected guide block 27, be arranged in leader block 32 be connected load bar 25 on guide block 27, be sleeved on loading spring 30 on load bar 25, make slide plate 29 along lock-screw 28, three load posts 34 that compress tested rolling bearing 6 cycle surfaces of the axially movable feed mechanism 39 of load bar 25, locking slide plate 29 axial locations and the load dish 33 that connects load bar 25 and load posts 34.Described slide plate 29 is connected by dovetail guide with base 38, the described load bar 25 middle parts preload nut 31 that has been threaded, described loading spring 30 is butted between preload nut 31 and rear guide block 27, the rear end of the front end of described load bar 25 and load dish 33 against, load dish 33 front ends compress the cycle surface of tested rolling bearing 6 by load posts 34.Between leader block 32 and load bar 25, between rear guide block 27 and load bar 25, guide bearing 37 is 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.The employing spring loads has advantages of that load is reliable and stable, and load maintainer is had advantages of without the background vibration source, thereby has improved the accuracy of test findings.
Described feed mechanism 39 is the screw rod feed mechanism, described screw rod feed mechanism comprises T-shaped 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-shaped nut 24, and T-shaped nut 24 is connected by eccentric bushing 26 with slide plate 29.Screw rod 23 adopts acme threads to be connected with T-shaped nut 24 to have advantages of that self-locking performance is good, driving force is large, satisfy the requirement that test load is large and load is stable.T-shaped nut 24 is connected by eccentric bushing 26 with slide plate 29, can eliminate the phenomenons such as not parallel and screw rod 23 rotation that cause of screw rod 23 axial lines and dovetail guide slip center line is dumb, stuck.
The front end of described 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 coordinates 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 contact with load dish 33 conical surfaces, and when the loading force of three load posts is inhomogeneous (when unbalance loading occurs), the contact sphere can be adjusted to the loading force of three load posts evenly automatically, and namely test load has self-aligning function.
With reference to Fig. 3: described load posts 34 comprises front end metalwork 50, rear end metalwork 48, be filled in the rubber layer 49 between front end metalwork 50 and rear end metalwork 48 and be connected to nut 47 on rear end metalwork 48.The load posts 34 that makes front end metalwork 50 and rear end metalwork 48 can satisfy the requirement of transmitting larger test load, middle rubber layer 49 of filling can isolate the external world or the vibration of testing machine background is delivered to the vibration interference of tested rolling bearing 6 by load maintainer 7, thereby has improved the accuracy of test findings.
Described load posts 34 has three, the front end of described load dish 33 is provided with three radially T-shaped chutes, three radially the center line of T-shaped chute intersect on the central axis of load dish, three load posts can slide and fix on three radially T-shaped chutes respectively, and three load posts 34 are evenly distributed on the center circumferential of load dish 33.According to 3 definite plane principles, three circumferential uniform load posts 34 can make the tested rolling bearing 6 even stands under load in outer ring.Three radially the center line of T-shaped chute intersect on the central axis of load dish, guaranteed that three load posts can be evenly distributed on load disk center circumference.After nut 47 on load posts 34 rear end metalworks 48 is unscrewed, two opposite side of nut 47 can radially T-shaped chute drive load posts 34 slide, after nut 47 is tightened, load posts 34 centers just are fixed on a certain radial position on T-shaped chute, such three load posts are with the adjustable mode connected load dish 33 of radial position, can make load posts 34 centers be adjusted to the center of tested rolling bearing 6 outer ring thickness, and can make a load dish 33 can satisfy the requirement of different model rolling bearing test.
Described load bar 25 front end spheres are connected by singly joining screw 36 with the load dish 33 rear end conical surfaces, and described singly joining between screw 36 and load dish 33 is equipped with elastic washer 35.Singly join elasticity with elastic washer 35 by what singly join screw 36 length, load dish 33 conical surfaces and load bar 25 spheres are more closely linked together, before making three load posts, transverse plane is roughly parallel to tested rolling bearing 6 cycle surfaces, facilitate the laboratory technician exactly the load posts center to be adjusted to tested rolling bearing 6 mid-depth positions, 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 aligning function.
The loading principle of above-mentioned load maintainer is as follows: by rotating the screw rod 23 of handwheel 22 rotary screw feed mechanisms, realize the axial feed of slide plate 29 and return, drive the axial feed of leader block 32, rear guide block 27 and return; Axial location by lock-screw 28 locking slide plates 29 and leader block 32, rear guide block 27 makes test load avoid rotating because handwheel 22, screw rod 23 etc. are abnormal or loosening changing in process of the test, the stability of impact examination load.Suit loading spring 30 on load bar 25, and the preload nut 31 that has been threaded at the middle part are by the pretightning force that preload nut 31 is regulated loading spring 30, the bulk that can dwindle load maintainer 7.course of action is: at first rotate handwheel 22 rotary screws 23, make T-shaped nut 24 promote slide plate 29 together with leader block 32 by eccentric bushing 26, rear guide block 27, load bar 25, loading spring 30, preload nut 31, load dish 33, load posts 34 moves forward, handwheel 22 stops operating when load posts 34 front end faces approach but not yet prop up tested rolling bearing 6 cycle surface, unscrew three nuts 47 on load posts rear end metalwork 48, the radially T-shaped chute drive of the two opposite side load posts 34 of nut 47 is slided, when the center of the tested rolling bearing 6 outer ring thickness of load posts centrally aligned, fastening nut 47, three load posts centers are fixed on the center circle of tested rolling bearing 6 outer ring thickness.And then rotation handwheel 22, make load posts 34 front end faces prop up tested rolling bearing 6 cycle surfaces, and be rotated further handwheel 22, 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 leader block 32 and rear guide block 27, rear guide block 27 continues compression-loaded spring 30 under condition of preload, spring force is applied on tested rolling bearing 6 cycle surfaces by preload nut 31, load bar 25, load dish 33, load posts 34.Be rotated further handwheel 22, until spring force reaches test load, then screw lock-screw 28, the position of locking slide plate 29 and leader block 32, rear guide block 27.Like this, load maintainer 7 is applied to test load on tested rolling bearing 6 cycle surfaces by rear guide block 27, loading spring 30, preload nut 31, load bar 25, load dish 33 and load posts 34, make tested rolling bearing 6 when the inner ring High Rotation Speed, the outer ring maintains static, the fixed form that is the outer ring does not change the end-play of tested rolling bearing 6, the cooperation operating mode is installed to the influence factor of test findings thereby eliminated the outer ring.
With reference to Fig. 4: the driving mechanism 4 of the quiet life test machine of rolling bearing, comprise drive motor 19, test mandrel 5, front hydraulic static spindle unit 17 and rear hydraulic static spindle unit 13, described front hydraulic static spindle unit 17 with rear hydraulic static spindle unit 13 by separate same main shaft fueller 21 fuel feeding of installation with driving mechanism 4; Described front hydraulic static spindle unit 17 comprises the first liquid hydrostatic bearing and is contained in the interior forward spindle 15 of first liquid hydrostatic bearing; Described rear hydraulic static spindle unit 13 comprises the second liquid hydrostatic bearing and is contained in the interior rear main shaft 10 of second liquid hydrostatic bearing; Described forward spindle 15 be connected main shaft 10 and connect by spring coupling 14; The rear end of described test mandrel 5 is joined form with cunning and is sleeved on tested rolling bearing 6 inner ring internal diameters, drive the inner ring synchronous rotary, test mandrel 5 front ends are connected with rear main shaft 10 rear ends by the Mohs conical surface, and the output shaft synchronous of described forward spindle 15 front ends and drive motor 19 is in transmission connection.Concrete, on the output shaft of described drive motor, driving pulley being housed, described forward spindle front end is equipped with driven pulley, and driving pulley and driven pulley are in transmission connection by Timing Belt 18.The toothed belt transmission connection has guaranteed the stable of test speed.
Front hydraulic static spindle unit 17, rear hydraulic static spindle unit 13 adopts liquid static-pressure supports, make forward spindle 15 and rear main shaft 10 be suspended in hydraulic oil before startup, 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 the main shaft antivibration good on the one hand, testing machine background vibration vibrations such as () drive motor or extraneous vibration had buffer action by main shaft to the transmission of tested rolling bearing 6, thereby make the vibration of testing machine background or extraneous vibration less to the vibration interference of tested rolling bearing 6, make on the other hand main shaft and fluid bearing not occur directly to contact, normal condition lower main axis and fluid bearing all can not be worn, thereby make main shaft longer accuracy life.
Described main shaft fueller 21 separates installation with driving mechanism 4, only with oil inlet pipe and scavenge pipe and front hydraulic static spindle unit 17 be connected hydraulic static spindle unit 13 and be connected, be to vibrate for the background that reduces driving mechanism 4.
Described forward spindle 15 be connected main shaft 10 and connect by spring coupling 14, the moment in roll of the synchronous belt 18 of forward spindle 15 can be delivered on rear main shaft 10, improved the running accuracy of rear main shaft 10, thereby improved the driving precision of tested rolling bearing 6.
Test mandrel 5 front ends are connected with the mohs tapered bore of rear main shaft 10 rear ends by the Mohs conical surface.Morse's taper is used for stationary fit can accurately locate, and because tapering is very little, utilizes conical surface friction power can transmit certain moment of torsion.And test load is delivered on test mandrel 5 shaft shoulders by tested housing washer, steel ball, inner ring, and test mandrel 5 is pressed on rear main shaft 10 with test load power all the time, makes test mandrel 5 remain tight with rear main shaft 10 in process of the test and is connected.Because be cone match, can dismantle easily test mandrel 5 again, satisfy the demand that the tested rolling bearing test of different size mandrel is convenient for changing.The present embodiment test mandrel 5 front ends adopt No. 2 Mohs conical surfaces, No. 2 mohs tapered bores of rear main shaft 10 rear ends employings.
Described first liquid hydrostatic bearing comprises front fluid pressure radial-thrust bearing 16 and the rear fluid pressure radial-thrust bearing 9 that is bearing in described forward spindle 15 two ends; Described second liquid hydrostatic bearing comprises front fluid pressure transverse bearing 11 and the rear fluid pressure transverse bearing 111 that is bearing in described rear main shaft 10 two ends and is arranged on the front fluid pressure axial thrust bearing 12 of described front fluid pressure transverse bearing 11 front ends and is arranged on the rear fluid pressure axial thrust bearing 121 of described rear fluid pressure transverse bearing 111 rear ends.
the front fluid pressure radial-thrust bearing 16 of described first liquid hydrostatic bearing and the thrust ring of rear fluid pressure radial-thrust bearing 9 adopt the heavy wool cavity configuration, have advantages of that anti-synchronous belt moment in roll is strong, improve the running accuracy of forward spindle 15, rear main shaft 10, thereby improved the driving precision of tested rolling bearing 6, the front fluid pressure transverse bearing 11 of described second liquid hydrostatic bearing, rear fluid pressure transverse bearing 111 adopt without circumferential oil-recovery tank structure, have advantages of that applicable rotating speed is high, running accuracy is high, antivibration is good, accuracy life is long, the front fluid pressure axial thrust bearing 12 of described second liquid hydrostatic bearing and rear fluid pressure axial thrust bearing 121 adopt annular single oil recess structure, has maximum axial carrying capacity, can satisfy the requirement of strenuous test load, and, before front fluid pressure axial thrust bearing 12, the axial oil sealing surface of fluid pressure transverse bearing 11 is as flow controller, simplified the structure of front fluid pressure axial thrust bearing 12, after rear fluid pressure axial thrust bearing 121, the axial oil sealing surface of fluid pressure transverse bearing 111 is as flow controller, simplified the structure of rear fluid pressure axial thrust bearing 121.
Described test mandrel 5 is assigned on tested 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 the end-play of tested rolling bearing 6, thereby test findings is installed with tested rolling bearing 6 inner rings coordinate the operating mode onrelevant, and can make tested rolling bearing 6 inner rings and test mandrel 5 not produce relative sliding, thereby make the test speed of tested rolling bearing 6 stable.Its gordian technique is test mandrel 5 and the control of tested rolling bearing 6 inner ring internal diameter tolerance clearances, can not be too little can not be too large, both guaranteed synchronous rotary, can slide again accessory and connect.
Described 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 advantages of that reactance voltage fluctuation ability is strong, thereby makes test speed stable.Utilize the frequency conversion of frequency converter 20 can provide different model the tested rolling bearing 6 required different rotating speeds of test.
The sensor 8 that the present embodiment one adopts is piezoelectric crystal acceleration type sensor 81, its installation diagram is seen Fig. 5, piezoelectric crystal acceleration type sensor 81 is fixed on saddle type magnetic patch 40 by the screw thread rigidity, and saddle type magnetic patch 40 is adsorbed on tested rolling bearing 6 outer rings in the radial direction.In the present embodiment, what piezoelectric crystal acceleration type sensor 81 was responded to is the radial vibration acceleration of tested rolling bearing 6, and the output terminal of piezoelectric crystal acceleration type sensor 81 amplifies with signal and the input end of processing mechanism 1 is connected.
in Fig. 6, described signal amplifies and processing mechanism 1 comprises that the charge signal that is directly proportional to tested rolling bearing 6 vibration accelerations with 81 outputs of piezoelectric crystal acceleration type sensor that connects successively amplifies and convert to the signal amplification unit of voltage signal, 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 the root-mean-square value computing unit that root-mean-square value calculates, the comparing unit that the vibration acceleration threshold value of the single-band root-mean-square value that calculates and setting is compared.When the single-band root-mean-square value during stably greater than setting threshold, judge the quiet end-of-life of tested rolling bearing 6, comparing unit sends the test command for stopping to controller 3, controller 3 is controlled described driving mechanism 4 stalls, testing machine is shut down, controller 3 records 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 is controlled driving mechanism 4 and remained in operation.Digital filtering unit filtering out frequency range, frequency band number, the frequency band range of signal can be adjusted as required.
The present embodiment is under the state of strenuous test load and strenuous test rotating speed, by tested rolling bearing 6 continuous runnings, the accumulative total that moves when increasing to setting threshold according to tested rolling bearing 6 vibration root-mean-square values is estimated the length in tested 6 quiet life-spans of rolling bearing.Need to prove, herein, " the vibration root-mean-square value is stably greater than setting threshold " refers to that tested 6 vibration continuous a period of times of root-mean-square value of rolling bearing are all greater than setting threshold.Length that should " continuously a period of time ", can life test machine background vibration quiet according to rolling bearing or the situation such as ambient vibration interference adjust and set, with the tested rolling bearing 6 vibration root-mean-square values of reliable evaluation greater than setting threshold.And " threshold value " can be according to bearing user's request for utilization, or the vibration root-mean-square value at 6 initial stages on-test of tested rolling bearing presets.
Embodiment two
Embodiment two is with the difference of embodiment one: the sensor 8 that embodiment two adopts is magnetic induction quality test of pile 82.Its installation diagram is referring to Fig. 7, magnetic induction quality test of pile 82 is arranged on the radially gliding mass 42 of sensor adjusting mechanism, radially gliding mass 42 is connected with axial gliding mass 44 rear ends by guide rail, by regulating radially screw mechanism 43 and axial screw mechanism 45, the gauge head that makes magnetic induction quality test of pile 82 is contacted with tested rolling bearing 6 outer ring external diameter 1/2 width position places with a certain size contact force.The gauge head contact force of magnetic induction quality test of pile 82 can not be too small, in order to avoid the vibration signal frequency is when higher, gauge head and tested rolling bearing 6 outer rings break away from, the vibration signal distortion that magnetic induction quality test of pile 82 is picked up.The gauge head contact force of magnetic induction quality test of pile 82 again can not be excessive, in order to avoid the free vibration of tested rolling bearing 6 outer rings is produced constraint, the vibration signal distortion that magnetic induction quality test of pile 82 is picked up.But the gauge head contact force of screw mechanism 43 minute adjustment magnetic induction quality test of piles 82 radially, the contact force of the present embodiment is 0.3N~0.6N.After magnetic induction quality test of pile 82 probe location and contact force are adjusted to the right place, by the radially fixedly radial position of magnetic induction quality test of pile 82 gauge heads of lock-screw 41, by the fixing axial location of magnetic induction quality test of pile 82 gauge heads of axial locking screw 46.What magnetic induction quality test of pile 82 was responded to is tested rolling bearing 6 outer ring radial vibration speed, and the output terminal of magnetic induction quality test of pile 82 amplifies with signal and the input end of processing mechanism 1 is connected.
referring to Fig. 8: signal amplifies and at first processing mechanism 1 amplifies the voltage signal that is directly proportional to tested rolling bearing 6 radial vibration speed of magnetic induction quality test of pile 82 outputs by signal amplification unit, through data acquisition unit, analog signal conversion is become digital signal again, then through the digital filtering unit, the vibration velocity digital signal filter is become three band signals of 50Hz ~ 300Hz, 300Hz ~ 1800Hz and 1800Hz ~ 10000Hz, each band signal is through separately root-mean-square value computing unit, calculate each frequency band root-mean-square value, and the comparing unit by separately, compare with predefined vibration velocity threshold value separately, when the vibration root-mean-square value of some or certain several frequency band during stably greater than the predefined threshold value of corresponding frequency band, judge the quiet end-of-life of tested rolling bearing 6, comparing unit sends the test command for stopping to controller 3, controller 3 is controlled described driving mechanism 4 stalls, the quiet life test machine of rolling bearing is shut down, controller 3 is record simultaneously, output test information and test findings.The content of Test Information is with embodiment one.If all less than the setting threshold of correspondence, comparing unit sends test to controller 3 and continues instruction each frequency band root-mean-square value, controller 3 is controlled driving mechanism 4 and is remained in operation.

Claims (8)

1. the load maintainer of the quiet life test machine of rolling bearing, it is characterized in that: comprise slide plate, the base that supporting plate slides, be fixed on leader block and rear guide block on slide plate, be arranged in the load bar on leader block and rear guide block, be sleeved on the loading spring on load bar, make slide plate along the axially movable feed mechanism of load bar, the latch mechanism of locking slide plate axial location, compress the load posts of tested housing washer end face, and the load dish that connects load bar and load posts, the preload nut has been threaded in the middle part of described load bar, described loading spring is butted between preload nut and rear guide block, the rear end of the front end of described load bar and load dish against, load dish front end compresses the cycle surface of tested rolling bearing by load posts.
2. the load maintainer of the quiet life test machine of rolling bearing as claimed in claim 1, it is characterized in that: described feed mechanism is the screw rod feed mechanism, described screw rod feed mechanism comprises T-shaped nut and the eccentric bushing of the handwheel of rotary screw, the screw rod that is located in the base two ends, connecting screw rod and slide plate, described handwheel is fixedly connected with spiro rod rear end, screw rod adopts acme thread to be connected with T-shaped nut, and T-shaped nut is connected by eccentric bushing with slide plate.
3. the load maintainer of the quiet life test machine of rolling bearing as claimed in claim 1 or 2, it is characterized in that: the front end of described load bar is arranged to sphere, centre of sphere design is on the axial line of load bar, the rear end of load dish is provided with the conical surface that coordinates with this sphere, and the vertex of a cone design of the conical surface is on the central axis of load dish.
4. the load maintainer of the quiet life test machine of rolling bearing as claimed in claim 3 is characterized in that: described load posts comprises front end metalwork, rear end metalwork, be filled in the rubber layer between front end metalwork and rear end metalwork and be connected to nut on the metalwork of rear end.
5. the load maintainer of the quiet life test machine of rolling bearing as claimed in claim 4, it is characterized in that: described load posts has three, the front end of described load dish is provided with three radially T-shaped chutes, three radially the center line of T-shaped chute intersect on the central axis of load dish, three load posts can slide and fix on three radially T-shaped chutes respectively, and three load posts are evenly distributed on the center circumferential of load dish.
6. the load maintainer of the quiet life test machine of rolling bearing as claimed in claim 5 is characterized in that: described load bar front end sphere is connected by singly joining screw with the load back-end disk conical surface, and described singly joining between screw and load dish is equipped with elastic washer.
7. the load maintainer of the quiet life test machine of rolling bearing as claimed in claim 1, it is characterized in that: described slide plate is connected by dovetail guide with base.
8. the load maintainer of the quiet life test machine of rolling bearing as claimed in claim 1, it is characterized in that: described latch mechanism is lock-screw.
CN2012203934724U 2012-08-09 2012-08-09 Loading Mechanism of Rolling Bearing Quiet Life Tester Expired - Lifetime CN202720123U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102809488A (en) * 2012-08-09 2012-12-05 浙江传媒学院 Loading mechanism of mute life testing machine of rolling bearing
CN112098089A (en) * 2020-08-21 2020-12-18 北京航空航天大学 A rolling bearing life test bench with multi-dimensional excitation load

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102809488A (en) * 2012-08-09 2012-12-05 浙江传媒学院 Loading mechanism of mute life testing machine of rolling bearing
CN112098089A (en) * 2020-08-21 2020-12-18 北京航空航天大学 A rolling bearing life test bench with multi-dimensional excitation load

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