CN109855868B - Dynamic test method and test equipment for axial stiffness of bearing - Google Patents

Dynamic test method and test equipment for axial stiffness of bearing Download PDF

Info

Publication number
CN109855868B
CN109855868B CN201711241496.1A CN201711241496A CN109855868B CN 109855868 B CN109855868 B CN 109855868B CN 201711241496 A CN201711241496 A CN 201711241496A CN 109855868 B CN109855868 B CN 109855868B
Authority
CN
China
Prior art keywords
bearing
ring
axial
cylinder
hollow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201711241496.1A
Other languages
Chinese (zh)
Other versions
CN109855868A (en
Inventor
胡英贝
李副来
马德峰
杨晨
李文超
杨虎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Luoyang Bearing Research Institute Co Ltd
Original Assignee
Luoyang Bearing Research Institute Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Luoyang Bearing Research Institute Co Ltd filed Critical Luoyang Bearing Research Institute Co Ltd
Priority to CN201711241496.1A priority Critical patent/CN109855868B/en
Publication of CN109855868A publication Critical patent/CN109855868A/en
Application granted granted Critical
Publication of CN109855868B publication Critical patent/CN109855868B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

The invention relates to a dynamic test method and test equipment for axial stiffness of a bearing. The invention applies a rotary action to one of the inner ring and the outer ring of the bearing through the rotary loading mechanism to form a rotary ferrule and a static ferrule, one of the rotating and static rings of the bearing to be tested is applied with a unidirectional axial load, and the other is provided with axial positioning along the opposite direction of the axial load, the axial relative displacement between the inner ring and the outer ring of the bearing is detected by the displacement sensor while rotating and applying axial load, so as to further measure the dynamic axial stiffness of the bearing, fill the blank in the field at present, the method does not measure a single point or a plurality of discrete points of the axial rigidity of the bearing, but provides a continuous and full-range measurement, the measured result can directly draw a dynamic curve of the corresponding axial rigidity of the bearing, the method is very key for researching the relation between the axial rigidity of the bearing and the rotating speed and the axial load of the main shaft, and has wide application prospect.

Description

Dynamic test method and test equipment for axial stiffness of bearing
Technical Field
The invention relates to a dynamic test method and test equipment for axial stiffness of a bearing.
Background
Along with the development of the characteristics of the main shaft of the engine and the main shaft of the machine tool in the directions of high rotating speed, high precision and high rigidity, the dynamic performance of the main shaft of the engine and the main shaft of the machine tool must pay attention in the design and test processes. The bearing is used as a core part in the main shaft of the main machine and comprises an inner ring and an outer ring, when the bearing is used, one of the inner ring and the outer ring is used as a rotating ferrule, the other one of the inner ring and the outer ring is used as a static ferrule, the influence of the dynamic performance parameters of the bearing on the overall performance of the main machine is very important, the modern high-performance main machine is tested and examined by the mechanical performance under the severe environment, the maneuvering overload can reach 10g-20g sometimes in the tests of impact, vibration and acceleration under the conditions of high temperature and low temperature, the tests are completed under the dynamic condition, the high overload puts a very high requirement on the dynamic rigidity index of the bearing, and the high requirement on the measurement precision of the dynamic rigidity of the bearing is.
At present, no special measuring equipment exists for measuring the dynamic stiffness of the aviation bearing in China, most users only carry out theoretical calculation on the stiffness of the bearing and also use a relatively simple experimental device to check and test the static stiffness of the bearing, but only the stiffness values of a plurality of discrete points are given, a dynamic stiffness curve cannot be drawn, and therefore the dynamic stiffness performance of the bearing cannot be truly reflected.
Disclosure of Invention
The invention aims to provide a bearing axial rigidity dynamic test device capable of detecting the axial rigidity of a bearing in a motion state; the invention also aims to provide a dynamic test method for the axial rigidity of the bearing.
In order to achieve the purpose, the dynamic testing method for the axial rigidity of the bearing adopts the following technical scheme:
the technical scheme 1: the dynamic test method for the axial rigidity of the bearing comprises the steps of applying a unidirectional axial load to one of a rotating ring and a static ring of the bearing to be tested, providing axial positioning for the other ring along the opposite direction of the axial load, and detecting the axial relative displacement of the rotating ring and the static ring through a displacement sensor in the rotating process of the rotating ring so as to obtain the axial rigidity of the bearing to be tested.
Has the advantages that: the invention provides a technology capable of dynamically measuring the axial rigidity of a bearing, which applies a rotating action to one of an inner ring and an outer ring of the bearing through a rotating loading mechanism to form a rotating ferrule and a static ferrule, applies a unidirectional axial load to one of the rotating ferrule and the static ferrule of the bearing to be measured, provides axial positioning to the other one along the reverse direction of the axial load, detects the axial relative displacement between the inner ring and the outer ring of the bearing through a displacement sensor while rotating and applying the axial load, further measures the dynamic axial rigidity of the bearing, fills the blank of the field at present, does not measure a single point or a plurality of discrete points of the axial rigidity of the bearing any more, but provides a continuous and full-range measurement, the measured result can directly draw a corresponding dynamic curve of the axial rigidity of the bearing, and is very critical for researching the relation between the axial rigidity of the bearing and the rotating speed and the axial load of a main shaft, has wide application prospect.
The technical scheme 2 is as follows: on the basis of the technical scheme 1, a hollow rotary cylinder applies axial load to a rotary ferrule of the bearing and drives the rotary ferrule to rotate. The hollow rotary cylinder drives the rotary ferrule to rotate and simultaneously can apply axial load, and the device is simple and convenient.
Technical scheme 3: on the basis of the technical scheme 2, the hollow rotary cylinder is matched with a rotating ring of the bearing in a centering and positioning mode through a centering mandrel of the hollow rotary cylinder. The bearing can be prevented from moving during the dynamic detection process.
The technical scheme 4 is as follows: on the basis of the technical scheme 3, the centering mandrel is a stepped shaft, the peripheral surface of the stepped shaft is in positioning fit with the bearing inner ring, the stepped surface is in pushing fit with the end surface of the bearing inner ring, and the bearing inner ring is the rotating ferrule. The arrangement of the step shaft not only realizes axial loading and circumferential driving rotation, but also can realize centering and positioning of the bearing inner ring.
The technical scheme 5 is as follows: on the basis of any one of the technical schemes 1 to 4, a closed-loop system consisting of a proportional pressure valve and a force sensor is used for detecting the real-time axial load output by the cylinder, and the axial load value is fed back to a system controller so that the system controller can make real-time adjustment.
The technical scheme 6 is as follows: on the basis of the technical scheme 5, the rigidity value under a certain rotating speed and axial load is calculated through measurement and control software according to the measured axial load, displacement and rotating speed, and a dynamic axial rigidity curve of the measured bearing is drawn.
The technical scheme 7 is as follows: on the basis of any one of the technical schemes 1 to 4, the displacement sensor is a non-contact displacement sensor. Due to the fact that the bearing is in high-speed operation during dynamic testing, the contact type displacement sensor can cause abrasion of a probe of the displacement sensor.
The first bearing axial stiffness dynamic test device adopts the following technical scheme:
the technical scheme 1: the dynamic test equipment for the axial rigidity of the bearing comprises a rack, wherein an axial loading mechanism for applying a unidirectional axial load to one of an inner ring and an outer ring of the bearing to be tested and a positioning mechanism for providing axial positioning support for the other one in the opposite direction of the axial load are arranged on the rack, the dynamic test equipment for the axial rigidity of the bearing further comprises a rotating loading mechanism for driving one of the inner ring and the outer ring to rotate relative to the other one, and the dynamic test equipment for the axial rigidity of the bearing further comprises a displacement sensor for detecting the axial relative displacement of the inner ring and the outer ring so as to obtain the axial rigidity of the bearing to be tested.
Has the advantages that: the loading mechanism is used for simultaneously applying a rotation action and a unidirectional axial load to one of the inner ring and the outer ring of the bearing and providing axial positioning to the other ring in the opposite direction of the axial load, the axial relative displacement between the inner ring and the outer ring of the bearing is detected by the displacement sensor while the axial load is rotated and applied, and then the dynamic axial stiffness of the bearing is measured, so that the blank in the field at present is filled.
The technical scheme 2 is as follows: on the basis of the technical scheme 1, the axial loading mechanism comprises a telescopic cylinder, and an output shaft of the telescopic cylinder is in centering fit with an inner ring or an outer ring of the bearing through a centering mandrel and provides axial loading.
Technical scheme 3: on the basis of the technical scheme 1 or 2, a force sensor for detecting the magnitude of the axial load applied to the bearing is further connected in series on a force transmission path of the axial loading mechanism.
The technical scheme 4 is as follows: on the basis of the technical scheme 1 or 2, the rotation loading mechanism comprises a rotating motor for providing rotating power.
The second bearing axial stiffness dynamic test device adopts the following technical scheme:
the technical scheme 1: the dynamic test equipment for the axial rigidity of the bearing comprises a rack, wherein a loading mechanism for applying a unidirectional axial load and a rotational load to one of an inner ring and an outer ring of the bearing to be tested so as to enable the inner ring and the outer ring to rotate relatively and a positioning mechanism for providing axial positioning support for the other one in the opposite direction of the axial load are arranged on the rack, and the dynamic test equipment for the axial rigidity of the bearing further comprises a displacement sensor for detecting the axial relative displacement of the inner ring and the outer ring so as to obtain the axial rigidity of the bearing to be tested.
Has the advantages that: the axial loading mechanism is used for applying a unidirectional axial load to one of the inner ring and the outer ring of the bearing, axial positioning is provided for the other ring in the opposite direction of the axial load, then the rotary loading mechanism is used for applying a rotary action to one of the inner ring and the outer ring of the bearing, the axial relative displacement between the inner ring and the outer ring of the bearing is detected by the displacement sensor while the axial load is rotated and applied, and the dynamic axial stiffness of the bearing is further measured.
The technical scheme 2 is as follows: on technical scheme 1's basis, loading mechanism includes the cylinder, and the cylinder includes cavity cylinder body and with cylinder body sliding fit's axial loading plunger, axial relative positioning is equipped with the pivot when the loading to the axial loading plunger, and the one end transmission of pivot is connected with rotating electrical machines, and the other end of pivot is for exporting the output of rotary load and axial load.
Technical scheme 3: on the basis of the technical scheme 2, the output end is also provided with a centering mandrel, and the centering mandrel is matched with one of the inner ring and the outer ring of the measured bearing in a centering manner.
The technical scheme 4 is as follows: on the basis of the technical scheme 3, the centering mandrel is provided with a step, the outer peripheral surface of the front small-diameter section of the step is in positioning fit with the inner peripheral surface of the inner ring of the tested bearing, and the step surface of the step is in pushing fit with the outer end surface of the inner ring of the bearing.
The technical scheme 5 is as follows: on the basis of any one of the technical schemes 1 to 4, a displacement adjusting mechanism for adjusting the position of the displacement sensor is further installed on the rack, and the displacement sensor is installed on a movable part of the displacement adjusting mechanism.
The technical scheme 6 is as follows: on the basis of any one of the technical schemes 1 to 4, a force sensor for detecting the axial load applied to the measured bearing is also connected in series on a force transmission path of the loading mechanism.
The technical scheme 7 is as follows: on the basis of any one of the technical schemes 1 to 4, the rack comprises a platform and a portal frame arranged on the platform, a positioning seat used for providing axial positioning for one of an inner ring and an outer ring of a measured bearing is fixed on an upper cross beam of the portal frame, and the loading mechanism and the positioning seat are coaxially arranged and are arranged on the platform.
Drawings
FIG. 1 is a schematic structural diagram of a dynamic test apparatus for axial stiffness of a bearing according to an embodiment of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is a schematic structural view of a loading mechanism of the hollow rotary cylinder;
in fig. 1 and 2: 1-damping anchor feet, 2-landing legs, 3-proportional pressure valves, 4-platforms, 5-portal frames, 6-crossbeams, 7-rotating motors, 8-motor connecting frames, 9-anti-rotation rods, 10-damping couplings, 11-limiting plates, 12-hollow rotary cylinders, 13-rubber damping cushions, 14-limiting columns, 15-force sensors, 16-linear bearings, 17-hollow cylinder plugs, 18-rotating rotors, 19-displacement adjusting mechanisms, 20-positioning seats, 21-displacement sensors, 22-measured bearings, 23-centering mandrels and 24-mounting frames;
in fig. 3: 101-loading end cover, 102-upper positioning end cover, 103-upper bearing, 104-outer spacing ring, 105-inner spacing ring, 17-hollow cylinder plunger, 107-cylinder upper end cover, 108-cylinder lubricating sealing ring, 109-hollow rotating shaft, 1010-plunger lubricating sealing ring, 1011-cylinder lower end cover, 1012-lower bearing, 1013-lower positioning end cover, 1014-motor mounting seat, 1015-cylinder driving end shaft, 1016-coupler, 1017-motor rotating shaft, 1018-motor body, 1019-cylinder wall cylinder, 1020-equipment frame, 1021-cylinder mounting plate and 15-force sensor.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
In the specific embodiment of the dynamic test equipment for the axial rigidity of the bearing, as shown in fig. 1, the dynamic test equipment for the axial rigidity of the bearing comprises a rack, wherein the rack comprises a platform 4, supporting legs 2 and a portal frame 5, the platform 4 is of a plate-shaped structure, the middle of the platform is provided with a mounting hole, and a mounting screw hole and the like are further formed in the platform. Landing leg 2 is set up to the lower part of platform 4, is equipped with rubber shock pad 13 between landing leg 2 and the platform 4 to the vibration to platform 4 cushions. The lower part of landing leg 2 is equipped with shock attenuation lower margin 1 to further carry out the buffering shock attenuation between landing leg 2 and the ground. The number of the supporting legs 2 is four, and the supporting legs are welded together through connecting rods. The upper part of the platform 4 is welded with a portal frame 5, and the portal frame 5 comprises an upright post and a beam 6 between the upright posts. A hollow rotary cylinder 12 is mounted on the platform 4, and the hollow rotary cylinder 12 comprises a cylinder body, a hollow cylinder plunger 17, a rotary rotor 18 and a centering mandrel 23. Wherein the cylinder body is arranged on the lower side surface of the platform 4, wherein the plunger 17 of the air cylinder penetrates through the mounting hole on the platform 4 and extends towards the upper part of the platform 4, and the plunger 17 of the hollow air cylinder can move up and down relative to the cylinder body so as to drive the rotary rotor 18 and the centering mandrel 23 on the hollow air cylinder to move axially. A force sensor 15 is further arranged between the cylinder body and the hollow cylinder plunger 17, and the magnitude of the axial force output by the cylinder is detected through the force sensor 15. The platform 4 is also provided with a limit post 14 which is in sliding fit with a corresponding structure on a hollow cylinder plunger 17 through a linear bearing 16 so as to axially guide the hollow cylinder plunger 17. The upper part of the plunger piston 17 of the medium air cylinder is connected with a rotating rotor 18, the rotating rotor 18 is only in axial push-pull fit with the hollow cylinder plunger piston 17 and is in circumferential rotation fit, namely the rotating rotor 18 is rotatably assembled in the hollow cylinder plunger piston 17, and the rotating rotor 18 is fixedly connected with a centering mandrel 23 on the upper part of the rotating rotor 18, so that the axial force can be transmitted to the centering mandrel 23 and the centering mandrel 23 can be driven to rotate.
The sub-unit connection of cavity revolving cylinder 12 has at least two to prevent bull stick 9, prevents that the cover is equipped with limiting plate 11 on the bull stick 9, and motor link 8 is installed to limiting plate 11 lower part, and rotating electrical machines 7 is installed to motor link 8 lower part, is equipped with the perforation in the middle of 8 cavity of motor link and the limiting plate 11, and the output shaft of rotating electrical machines 7 upwards is connected with the rotatory rotor 18 of cavity revolving cylinder 12 behind the shock attenuation shaft coupling 10 to drive rotatory rotor 18 and rotate. A proportional pressure valve 3 is further mounted near the middle of the support leg 2 on the machine frame, the proportional pressure valve 3 is connected with an air path of the hollow rotary cylinder 12 to form a closed loop system in cooperation with a force sensor 15 to detect real-time axial load output by the hollow rotary cylinder 12.
As shown in fig. 2, a through hole is formed in an upper cross beam 6 of the portal frame 5, a displacement adjusting mechanism 19 composed of a screw nut mechanism is installed on the cross beam 6, an installation frame 24 is connected to the displacement adjusting mechanism 19, a vertical rod of the installation frame 24 penetrates through the through hole in the cross beam 6, and the axial position and the radial position of the vertical rod of the installation frame 24 can be adjusted through the displacement adjusting mechanism 19. The lower part of the vertical rod is provided with a displacement sensor 21, and the displacement sensor 21 in the embodiment is a capacitance displacement sensor. The lower part of the crossbeam 6 is fixed with a positioning seat 20, the positioning seat 20 is provided with two sleeve sections which are coaxially arranged with a through hole on the crossbeam 6, the diameter of the lower sleeve section of the positioning seat 20 is smaller and is used for being in pushing fit with the outer ring of the measured bearing 22, a positioning mandrel of the hollow rotary cylinder 12 is matched with the inner ring on the other axial side of the measured bearing 22 through a step surface, the small-diameter section of the step extends into the inner ring and is in centering fit with the inner ring to realize the centering of the bearing, the step surface is in pushing fit with the lower end surface of the inner ring so as to apply axial load to the inner ring of the bearing when the hollow rotary cylinder 12 applies axial force, and the axial force of the positioning mandrel of the hollow rotary cylinder 12 is applied to the inner ring of the measured bearing 22 from bottom. Meanwhile, because the step surface of the positioning mandrel is pressed against the inner ring of the measured bearing 22, friction force exists between the inner ring and the outer ring due to extrusion, and because the inner ring and the outer ring are in rolling fit through steel balls, the friction force is small, the inner ring can be driven to rotate relative to the outer ring by slightly applying axial force, and when the rotating motor 7 drives the rotating rotor 18 to rotate so as to drive the positioning mandrel to rotate, the inner ring of the measured bearing 22 can be driven to rotate along with the rotating rotor, so that the dynamism of the measured bearing 22 is realized. At this time, the displacement sensor 21 located at the lower portion of the vertical rod of the mounting bracket 24 can extend the displacement sensor 21 to the axis of the measured bearing 22 and be located at the central position of the measured bearing 22 under the adjustment of the displacement adjusting device, and the displacement sensor 21 can detect the axial displacement or the deformation of the inner ring of the dynamic measured bearing 22.
Meanwhile, the dynamic bearing axial rigidity testing equipment further comprises a controller, the controller is respectively in control connection with the displacement sensor 21, the force sensor 15, the rotating motor 7 and the hollow rotary air cylinder 12, the size of an axial load output by the hollow rotary air cylinder 12 fed back by the force sensor 15, the size of a rotating speed output by the rotating motor 7 and the size of a displacement value fed back by the displacement sensor 21 can be received, meanwhile, the controller has a calculation processing function, the measured rotating speed value, the measured axial load value and the measured displacement value can be subjected to logic operation to obtain rigidity values under a certain rotating speed and a certain axial load, a dynamic axial rigidity curve of the tested bearing 22 can be drawn, and the curve can be controlled to be directly displayed by a display. Before drawing the stiffness curve, the controller firstly needs to adjust the rotating speed and the axial load and measure the corresponding displacement value on the premise.
When the dynamic test equipment for the axial rigidity of the bearing is used: placing a measured bearing 22 between a positioning mandrel and a positioning seat 20, ensuring that a step surface of the positioning mandrel is pressed against an inner ring of the positioning mandrel, a small-diameter section of the positioning mandrel extends into the inner ring of the bearing to be attached to the inner circumferential surface of the inner ring of the bearing to realize a centering effect, pressing the positioning seat 20 against the outer ring of the bearing, adjusting a displacement adjusting mechanism 19 to ensure that a displacement sensor 21 extends to the central position of the inner ring of the measured bearing 22, starting a hollow rotary cylinder 12 through a controller to apply a certain axial load to the measured bearing 22, starting a rotary motor 7 through the controller to apply a certain rotating speed to the inner ring of the measured bearing 22, measuring the axial displacement value of the inner ring under the axial load and the rotating speed through the displacement sensor 21, then adjusting the axial load value or the rotating speed value to obtain a series of displacement values, feeding the measured data back to the controller, and feeding the equipment into a load section and a rotating speed interval required by the measured bearing, The displacement value, the spindle speed and other factors can be used for drawing a series of points in a load/displacement coordinate system, and the rigidity value of the measured bearing 22 under a certain speed and axial load is calculated through special measurement and control software, so that the dynamic rigidity curve of the measured bearing 22 is drawn.
The embodiment of the second bearing axial rigidity dynamic test device comprises: the dynamic test equipment for the axial rigidity of the bearing is different from the dynamic test equipment for the axial rigidity of the bearing disclosed by the embodiment of the invention in that two sets of independent mechanisms are adopted for loading the axial load of the bearing and loading the rotating action of the bearing.
The invention relates to a bearing axial rigidity dynamic test method, which comprises the following specific embodiments: the upper side of the bearing in the axial direction is provided with a positioning seat 20, namely the positioning seat 20 is arranged on a cross beam 6 at the upper part of a portal frame 5, a hollow rotary cylinder 12 is arranged on a platform 4 below a tested bearing 22, a positioning mandrel of the hollow rotary cylinder 12 is pressed against an inner ring of the tested bearing 22, meanwhile, the positioning seat 20 is pressed against an outer ring of the tested bearing 22, the positioning seat 20 is in pushing fit with the outer ring of the tested bearing 22, a centering mandrel 23 of the cylinder is in pushing fit with the inner ring of the bearing, an output shaft of a rotary motor 7 is in transmission connection with the centering mandrel 23, the hollow rotary cylinder 12 is controlled by a controller, an air cylinder plunger 17 applies an axial load to the tested bearing 22 through a rotary rotor 18 and the positioning mandrel, the rotary motor 7 is controlled by the controller to rotate so as to drive the inner ring of the tested bearing 22 to rotate through the rotary rotor 18 and the positioning mandrel, the displacement sensor 21 is arranged at the center of the measured bearing 22, and the position of the displacement sensor 21 can be adjusted through the displacement adjusting mechanism 19 so as to detect the relative displacement of the inner ring and the outer ring of the bearing under a certain rotating speed and axial load, thereby obtaining the axial stiffness value of the measured bearing 22 under a certain rotating speed and axial load under the calculation of measurement and control software of the controller, and further drawing a dynamic axial stiffness curve of the bearing.
In other embodiments: the hollow rotary cylinder can be replaced by a hollow rotary oil cylinder, and both the hollow rotary cylinder and the hollow rotary oil cylinder belong to hollow rotary piston cylinders; the displacement sensor can be replaced by a non-contact displacement sensor such as an eddy current displacement sensor, a spectrum displacement sensor, a reflection type laser displacement sensor and the like; the following modes can be replaced when the bearing is axially loaded and rotated: firstly, a measured bearing inner ring can be positioned through a positioning mandrel or other positioning components, the axial load of the measured bearing is loaded by applying an axial load on a measured bearing outer ring, at the moment, the rotary motion can be loaded on the inner ring or the outer ring, it needs to be explained that the axial load and the rotary motion of the embodiment are simultaneously loaded on the bearing inner ring through the centering mandrel, and the axial load and the rotary motion of the embodiment can also be respectively loaded on the inner ring and the outer ring through two or more sets of mechanisms in other embodiments; the two sets of mechanisms can be loaded on the inner ring or the outer ring respectively; for example: the positioning seat is supported on the bearing inner ring, the positioning mandrel is supported on the bearing outer ring, and the positioning seat is connected with a mechanism capable of being axially loaded, such as an air cylinder and the like, so that the bearing inner ring is axially loaded from top to bottom, the positioning mandrel provides torque for the bearing outer ring, and the bearing outer ring is driven to rotate relative to the bearing inner ring; for another example: the positioning seat is connected with the axial loading mechanism to provide axial loading from top to bottom for the bearing outer ring, the positioning mandrel only provides positioning and centering support for the bearing inner ring and drives the bearing inner ring to rotate, at the moment, the bearing outer ring can axially displace or deform, and the displacement sensor can be arranged outside the bearing outer ring to detect the axial displacement of the bearing outer ring relative to the bearing inner ring.
In particular, in order to more clearly understand how the hollow rotary cylinder can simultaneously load the axial load and the rotary load, the following detailed description is made:
as shown in fig. 3, the cylinder comprises a hollow cylinder body and a hollow cylinder plunger 17 slidably engaged with the cylinder body, two ends of the hollow cylinder plunger 17 respectively extend out of the cylinder body, a hollow rotating shaft 109 is rotatably assembled in an inner cavity of the plunger, a pair of angular contact ball bearings, namely an upper bearing 103 and a lower bearing 1012, are arranged between the hollow cylinder plunger 17 and the hollow rotating shaft 109, an inner spacer 105 and an outer spacer 104 are arranged between the two angular contact ball bearings, two ends of the hollow cylinder plunger 17 are connected with inward convex stops for stopping an outer ring of the angular contact ball bearing, the hollow rotating shaft 109 is provided with an outward convex brim for stopping an inner ring of the angular contact ball bearing, axial pushing engagement of the middle air cylinder plunger 17 and the middle idle shaft 109 is realized through the bearings, the inner and outer spacer are engaged with the stops, and the brim is used for realizing transmission of axial load, one end of the hollow rotating shaft 109 is in transmission connection with a rotating motor, the middle idle shaft 109 is driven to rotate by the rotating motor, so that the loading of the rotating load is realized, and the other end of the hollow rotating shaft 109 is an output end capable of outputting the rotating load and the axial load.
Wherein the cylinder body has open-ended cylinder shell structure for both ends, including cylinder wall section of thick bamboo 1019 and connect cylinder upper end cover 107 and cylinder lower end cover 1011 at cylinder wall section of thick bamboo 1019 both ends, the pore wall of the trompil of cylinder upper end cover 107 and cylinder lower end cover 1011 is inlayed and is had cylinder lubricated sealing ring 108 for with the periphery wall sliding seal cooperation of cavity cylinder plunger 17, prevent gas leakage.
The medium air cylinder plunger 17 comprises a cylindrical shell, an upper positioning end cover 102 and a lower positioning end cover 1013 which are connected with two ends of the cylindrical shell through screws, the upper positioning end cover and the lower positioning end cover are internally protruded to form the stop platform in stop fit with the outer ring of the angular contact ball bearing, the middle part of the periphery of the cylindrical shell is also provided with an annular boss to form a piston ring, and the peripheral surface of the annular boss is embedded with two plunger lubricating sealing rings 1010 to realize sliding seal fit with the cylinder wall cylinder 1019.
The hollow rotating shaft 109 comprises a cylindrical body and a loading end cover 101 connected to one end of the hollow rotating shaft 109 through a screw, the outer end of the loading end cover 101 is provided with a pushing part, a corresponding structure corresponding to the structure of an output part is arranged for the output end of the rotating shaft, for example, when the output part is a bearing inner ring, a convex annular boss matched with the size of the inner ring is arranged to be matched with the inner ring, so that a rotary load and an axial load are output for the bearing inner ring. The loading end cover 101 is provided with a convex annular boss which is used as a blocking eave in blocking fit with the inner ring of the angular contact ball bearing; the other end of the hollow rotating shaft 109 is provided with a convex annular boss which is used as a blocking eave matched with the inner ring block of the angular contact ball bearing; meanwhile, the end is further connected with a cylinder driving end shaft 1015 through a screw, and the radial section of the cylinder driving end shaft 1015 is in a T shape and is provided with a connecting shaft for connecting with a rotating motor through a coupling 1016 so as to transmit the rotating load of the rotating motor to the loading end cover 101.
The cylinder driving end shaft 1015 is provided with a hollow motor mounting seat 1014 in an outer cover, the inner cavity can accommodate the cylinder driving end shaft 1015, a coupling 1016 and a motor output shaft, a rotating motor is arranged on the motor mounting seat 1014, and the motor mounting seat 1014 is fixed relative to the middle air cylinder plunger 17 so as to axially displace along with the hollow cylinder plunger 17.
Firstly, a plunger 17 of the middle air cylinder, an upper end cover 107 of the cylinder, a lubricating sealing ring 108 of the cylinder, a lubricating sealing ring 1010 of the plunger, a wall cylinder 1019 of the cylinder and a lower end cover 1011 of the cylinder are sequentially installed in place, fastened with each other through screws and installed to form a middle air cylinder component, so that the installed middle air cylinder is ensured to operate flexibly under the ventilation condition and has no phenomena of jamming and creeping.
And then the upper bearing 103, the outer spacer ring 104, the inner spacer ring 105, the lower bearing 1012 and the cylinder driving end shaft 1015 are sequentially installed on the hollow rotating shaft 109, the upper bearing 103 and the lower bearing 1012 are pre-tightened during installation so as to improve rigidity and precision, and are fastened through screws to form a whole precision machine spindle part, so that the rotation precision and the operation flexibility of the precision machine spindle are ensured. Then the whole precision main shaft part is installed in the middle air cylinder part which is installed before, the upper positioning end cover 102 and the lower positioning end cover 1013 are used for pressing the precision machine main shaft part into the hollow air cylinder part through screws, the form that the precision machine main shaft is embedded in the hollow air cylinder is formed, the front and back operation of the air cylinder under the ventilation condition is ensured, and the inner precision machine main shaft can flexibly rotate.
Then a coupling 1016 is installed on the precise spindle part and is fastened through screws, a motor installation seat 1014 is installed on the hollow air cylinder assembly, then a rotating motor is installed on the motor installation seat 1014 and is centered and positioned through a spigot of a motor installation end, a motor rotating shaft 1017 is inserted into the lower end of the coupling 1016 and is fastened through screws in the installation process, and the motor-driven hollow air cylinder embedded precise shaft system integral assembly is formed, and the motor-driven hollow air cylinder embedded precise shaft system assembly is connected with the air cylinder installation plate 1021 through screws.
The force sensor 15 is mounted on the equipment rack 1020 by screws; and finally, placing the motor-driven hollow cylinder embedded precision shafting assembly on the force sensor 15 through hoisting, rotating the motor at the moment, driving the hollow rotating shaft 109 to rotate by the rotating shaft 1017 of the motor, thereby driving the rotation of the tested assembly, accessing compressed air to the lower end of the hollow cylinder, pushing the air cylinder plunger 17 to move upwards in the cylinder by the compressed air to output an axial load, accurately measuring the counter-acting force output by the hollow cylinder through the force sensor 15 by the axial load, feeding the counter-acting force back to the controller, and reversely controlling the size adjustment of the axial loading load of the cylinder through the controller.

Claims (12)

1. The dynamic test method of the axial rigidity of the bearing is characterized in that a unidirectional axial load is applied to one of a rotating ferrule and a static ferrule of the bearing to be tested, axial positioning is provided for the other ferrule along the opposite direction of the axial load, the axial load is applied to the rotating ferrule of the bearing through a hollow rotary cylinder and drives the rotating ferrule to rotate, and in the rotating process of the rotating ferrule, the axial relative displacement of the rotating ferrule and the static ferrule is detected through a displacement sensor so as to obtain the axial rigidity of the bearing to be tested;
the hollow rotary cylinder comprises a hollow cylinder body and a middle air cylinder plunger which is in sliding fit with the cylinder body, two ends of the middle air cylinder plunger respectively extend out of the cylinder body, a hollow rotating shaft is rotatably assembled in an inner cavity of the plunger, one end of the hollow rotating shaft is in transmission connection with a rotary motor, and the other end of the hollow rotating shaft is an output end capable of outputting rotary load and axial load;
a pair of angular contact ball bearings, namely an upper bearing and a lower bearing, are arranged between the middle air cylinder plunger and the hollow rotating shaft, and an inner spacer ring and an outer spacer ring are arranged between the two angular contact ball bearings;
the hollow cylinder plunger comprises a cylindrical shell, an upper positioning end cover and a lower positioning end cover which are connected to two ends of the cylindrical shell through screws, and the upper positioning end cover and the lower positioning end cover are internally convex to form a stop platform matched with the outer ring stop of the angular contact ball bearing;
the hollow rotating shaft comprises a cylindrical body and a loading end cover connected to one end of the hollow rotating shaft through a screw, the loading end cover is provided with an outward-protruding annular boss, the annular boss is used as a blocking eave in blocking fit with the inner ring of the upper bearing, and the other end of the hollow rotating shaft is provided with an outward-protruding annular boss which is used as a blocking eave in blocking fit with the inner ring of the lower bearing;
the axial pushing matching of the hollow cylinder plunger and the middle idle shaft is realized through the matching of the bearing, the inner space ring and the outer space ring with the baffle table and the baffle eaves, so that the transmission of axial load is realized;
the other end of the hollow rotating shaft is further connected with a cylinder driving end shaft through a screw, a hollow motor mounting seat is arranged on the outer cover of the cylinder driving end shaft, a coupler and a motor output shaft can be accommodated in an inner cavity, a rotating motor is mounted on the motor mounting seat, and the motor mounting seat is fixed relative to the middle air cylinder plunger to axially displace along with the hollow cylinder plunger.
2. The method for dynamically testing the axial rigidity of the bearing as claimed in claim 1, wherein the hollow rotary cylinder is matched with a rotating ring of the bearing in a centering and positioning manner through a centering mandrel of the hollow rotary cylinder.
3. The method for dynamically testing the axial rigidity of the bearing as claimed in claim 2, wherein the centering mandrel is a stepped shaft, the outer peripheral surface of the stepped shaft is in positioning fit with the inner ring of the bearing, the stepped surface is in pushing fit with the end surface of the inner ring of the bearing, and the inner ring of the bearing is the rotating ring.
4. A method for dynamically testing axial rigidity of a bearing according to any one of claims 1 to 3, wherein a closed loop system consisting of a proportional pressure valve and a force sensor is used for detecting real-time axial load output by a cylinder, and the axial load value is fed back to a system controller so that the system controller can make real-time adjustment.
5. The dynamic test method for the axial rigidity of the bearing as claimed in claim 4, wherein the rigidity value under a certain rotating speed and axial load is calculated by the measurement and control software according to the measured axial load, displacement and rotating speed, and a dynamic axial rigidity curve of the measured bearing is drawn.
6. The dynamic bearing axial stiffness testing method according to any one of claims 1 to 3, wherein the displacement sensor is a non-contact displacement sensor.
7. The dynamic test equipment for the axial rigidity of the bearing is characterized by comprising a rack, wherein a loading mechanism for applying a unidirectional axial load and a rotational load to one of an inner ring and an outer ring of the bearing to be tested so as to enable the inner ring and the outer ring to rotate relatively and a positioning mechanism for providing axial positioning support for the other one in the opposite direction of the axial load are arranged on the rack;
the loading mechanism comprises an air cylinder, the air cylinder comprises a hollow cylinder body and a plunger of a middle air cylinder in sliding fit with the cylinder body, two ends of the plunger of the middle air cylinder respectively extend out of the cylinder body, a hollow rotating shaft is rotatably assembled in an inner cavity of the plunger, one end of the hollow rotating shaft is in transmission connection with a rotating motor, and the other end of the hollow rotating shaft is an output end capable of outputting a rotating load and an axial load;
a pair of angular contact ball bearings, namely an upper bearing and a lower bearing, are arranged between the middle air cylinder plunger and the hollow rotating shaft, and an inner spacer ring and an outer spacer ring are arranged between the two angular contact ball bearings;
the hollow cylinder plunger comprises a cylindrical shell, an upper positioning end cover and a lower positioning end cover which are connected to two ends of the cylindrical shell through screws, and the upper positioning end cover and the lower positioning end cover are internally convex to form a stop platform matched with the outer ring stop of the angular contact ball bearing;
the hollow rotating shaft comprises a cylindrical body and a loading end cover connected to one end of the hollow rotating shaft through a screw, the loading end cover is provided with an outward-protruding annular boss, the annular boss is used as a blocking eave in blocking fit with the inner ring of the upper bearing, and the other end of the hollow rotating shaft is provided with an outward-protruding annular boss which is used as a blocking eave in blocking fit with the inner ring of the lower bearing;
the axial pushing matching of the hollow cylinder plunger and the middle idle shaft is realized through the matching of the bearing, the inner space ring and the outer space ring with the baffle table and the baffle eaves, so that the transmission of axial load is realized;
the other end of the hollow rotating shaft is further connected with a cylinder driving end shaft through a screw, a hollow motor mounting seat is arranged on the outer cover of the cylinder driving end shaft, a coupler and a motor output shaft can be accommodated in an inner cavity, a rotating motor is mounted on the motor mounting seat, and the motor mounting seat is fixed relative to the middle air cylinder plunger to axially displace along with the hollow cylinder plunger.
8. The dynamic bearing axial stiffness testing device as claimed in claim 7, wherein a centering mandrel is further mounted on the output end, and the centering mandrel is matched with one of the inner ring and the outer ring of the tested bearing in a centering manner.
9. The dynamic test equipment for the axial rigidity of the bearing as claimed in claim 8, wherein the centering mandrel is provided with a step, the outer peripheral surface of the small diameter section at the front end of the step is in positioning fit with the inner peripheral surface of the inner ring of the bearing to be tested, and the step surface of the step is in pushing fit with the outer end surface of the inner ring of the bearing.
10. The dynamic bearing axial rigidity testing equipment according to any one of claims 7 to 9, wherein a displacement adjusting mechanism for adjusting the position of the displacement sensor is further mounted on the frame, and the displacement sensor is mounted on a movable part of the displacement adjusting mechanism.
11. The dynamic bearing axial stiffness testing device according to any one of claims 7 to 9, wherein a force sensor for detecting an axial load applied to a tested bearing is further connected in series to a force transmission path of the loading mechanism.
12. The dynamic bearing axial rigidity testing equipment according to any one of claims 7 to 9, wherein the rack comprises a platform and a portal frame arranged on the platform, a positioning seat for providing axial positioning for one of an inner ring and an outer ring of the tested bearing is fixed on an upper cross beam of the portal frame, and the loading mechanism is arranged coaxially with the positioning seat and is installed on the platform.
CN201711241496.1A 2017-11-30 2017-11-30 Dynamic test method and test equipment for axial stiffness of bearing Active CN109855868B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201711241496.1A CN109855868B (en) 2017-11-30 2017-11-30 Dynamic test method and test equipment for axial stiffness of bearing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201711241496.1A CN109855868B (en) 2017-11-30 2017-11-30 Dynamic test method and test equipment for axial stiffness of bearing

Publications (2)

Publication Number Publication Date
CN109855868A CN109855868A (en) 2019-06-07
CN109855868B true CN109855868B (en) 2021-01-22

Family

ID=66888545

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201711241496.1A Active CN109855868B (en) 2017-11-30 2017-11-30 Dynamic test method and test equipment for axial stiffness of bearing

Country Status (1)

Country Link
CN (1) CN109855868B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110411841B (en) * 2019-07-05 2021-09-21 人本股份有限公司 Detection device for detecting load bearing capacity of steering gear bearing
CN111044242B (en) * 2019-12-30 2021-09-28 哈尔滨工业大学 Rigidity detection device and detection method for main shaft and guide rail of ultra-precise fly-cutting machine tool

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20060016216A (en) * 2004-08-17 2006-02-22 삼성테크윈 주식회사 Apparatus for suppling axial direction load of bearing tester
CN102628747A (en) * 2012-05-08 2012-08-08 重庆大学 Multifunctional tribology performance test system
CN203053702U (en) * 2013-01-05 2013-07-10 西安交通大学 Dynamic and static stiffness testing device for angular contact ball bearing
CN204903163U (en) * 2015-05-19 2015-12-23 清华大学 Power self -balancing thrust bearing test bench structure
CN105758643A (en) * 2016-03-15 2016-07-13 洛阳轴研科技股份有限公司 Bearing carrying capability detection device
CN105954033A (en) * 2016-05-31 2016-09-21 清华大学 Double-working-condition vertical-type thrust bearing testing device
CN106768749A (en) * 2017-02-21 2017-05-31 中国科学院沈阳自动化研究所 A kind of main shaft bearing joint portion device for testing dynamic stiffness
CN206281652U (en) * 2016-12-06 2017-06-27 广州番禺职业技术学院 A kind of miniature bearing axial rigidity tester
CN206555305U (en) * 2017-03-16 2017-10-13 人本集团有限公司 The mainshaft mechanism of smooth running

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20060016216A (en) * 2004-08-17 2006-02-22 삼성테크윈 주식회사 Apparatus for suppling axial direction load of bearing tester
CN102628747A (en) * 2012-05-08 2012-08-08 重庆大学 Multifunctional tribology performance test system
CN203053702U (en) * 2013-01-05 2013-07-10 西安交通大学 Dynamic and static stiffness testing device for angular contact ball bearing
CN204903163U (en) * 2015-05-19 2015-12-23 清华大学 Power self -balancing thrust bearing test bench structure
CN105758643A (en) * 2016-03-15 2016-07-13 洛阳轴研科技股份有限公司 Bearing carrying capability detection device
CN105954033A (en) * 2016-05-31 2016-09-21 清华大学 Double-working-condition vertical-type thrust bearing testing device
CN206281652U (en) * 2016-12-06 2017-06-27 广州番禺职业技术学院 A kind of miniature bearing axial rigidity tester
CN106768749A (en) * 2017-02-21 2017-05-31 中国科学院沈阳自动化研究所 A kind of main shaft bearing joint portion device for testing dynamic stiffness
CN206555305U (en) * 2017-03-16 2017-10-13 人本集团有限公司 The mainshaft mechanism of smooth running

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
一种小型滚针圆度测量仪;李利歌等;《轴承》;20141231(第7期);60-62 *
轴承摩擦力矩测量的新型轴向加载装置;高奋武等;《轴承》;20101231(第3期);44-45 *
预紧对高速角接触球轴承动态刚度的影响;王保民等;《兰州理工大学学报》;20090430;第35卷(第2期);29-32 *

Also Published As

Publication number Publication date
CN109855868A (en) 2019-06-07

Similar Documents

Publication Publication Date Title
CN109855868B (en) Dynamic test method and test equipment for axial stiffness of bearing
CN106092577B (en) Dynamic characteristic testing device for high-speed angular contact ball bearing retainer
CN101881696B (en) Flexible foil gas thrust bearing performance test bed with rolling friction pair
CN202720121U (en) Precision miniature bearing dynamic performance testing device
CN108344534B (en) Device and method for testing friction torque of bearing under composite load
CN102620935A (en) Loading device of high-speed bearing tester
CN202453184U (en) Parameter measurement device for tapered roller bearing
CN102636348A (en) High speed bearing tester
CN104807641A (en) Self-force balancing thrust bearing test board
CN106092398A (en) A kind of high-speed micro bearing dynamic friction torque measuring instrument
CN102564664B (en) Tapered roller bearing parameter measurement device
CN108759758A (en) A kind of engine bearing clearance detector and measurement method
CN101762353A (en) CVT (Contiuously Variable transmission) axial force test device
CN202522411U (en) Loading device for high-speed bearing test machine
CN104880308B (en) A kind of main shaft axial force isostatic pressed loading device
CN104502104A (en) Motor bearing test bed
CN202522412U (en) High-speed bearing testing machine
CN204346708U (en) A kind of motor bearings testing table
CN209214576U (en) A kind of equal diameter superdeep holes inside diameter measurement system based on flexible cable traction
CN109655265B (en) Magnetic suspension shafting protective bearing performance testing machine
CN102607750B (en) Test-bed for friction torque of rolling bearing
CN210221495U (en) Bearing life testing device
CN207741935U (en) roller bearing testing machine
CN110261106A (en) A kind of torque detecting apparatus of hub bearing
CN205483560U (en) Antifriction bearing axial loading device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant