CN111024341A - Contact rigidity testing device and testing method - Google Patents
Contact rigidity testing device and testing method Download PDFInfo
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- CN111024341A CN111024341A CN201911357910.4A CN201911357910A CN111024341A CN 111024341 A CN111024341 A CN 111024341A CN 201911357910 A CN201911357910 A CN 201911357910A CN 111024341 A CN111024341 A CN 111024341A
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- part clamp
- clamp body
- mounting
- bevel gear
- guide rod
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0041—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress
- G01M5/005—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress by means of external apparatus, e.g. test benches or portable test systems
Abstract
The invention belongs to the field of research of contact rigidity testing methods and design of testing devices, and relates to a contact rigidity testing device and a testing method, which are used for accurately testing contact rigidity. The testing device can be used for measuring the contact rigidity of parts with different shapes and sizes, and realizes the automatic clamping of the parts; the method of compensating deformation and multi-point measurement are adopted, so that the test result is more accurate; the test part is convenient to mount, the loading system is stable, the contact deformation test is accurate, the contact deformation is compensated, and the influence of irrelevant deformation is eliminated; the problems that an existing contact rigidity testing device is large in testing result error, parts of contact rigidity testing equipment are inconvenient to clamp, the testing device is complex and the testing device is not universal are solved.
Description
Technical Field
The invention belongs to the field of research of contact rigidity testing methods and design of testing devices, and relates to a contact rigidity testing device and a testing method, which are used for accurately testing contact rigidity.
Background
The contact rigidity is the capacity of the joint surface of the parts to resist contact deformation under the action of external force, and the rigidity characteristic of the whole machine is greatly dependent on the contact rigidity between the parts. For example, a guide rail of a precision machine tool requires larger contact rigidity so as to ensure the processing precision of parts; the contact stiffness between the bearing rolling elements and the raceways directly determines the overall stiffness characteristics of the bearing. Therefore, the design of the testing device for the contact rigidity and the provision of the testing method for the contact rigidity with higher accuracy have important significance for the design and safe use of machine parts.
Related patents or papers at home and abroad propose a testing device for contact rigidity and a related testing method. For example: a high-precision ultrasonic detection method (CN103616436A) for contact stiffness provides an ultrasonic detection method for contact stiffness, which adopts a broadband ultrasonic probe to detect a contact area, then calculates the ultrasonic reflectivity under more than two frequencies, brings the ultrasonic reflectivity and the corresponding frequency into a new joint surface acoustic model to calculate, and finally corrects the calculated result by using a correction formula to obtain the required contact stiffness. A static normal contact rigidity measuring device (CN201876396U) of a joint surface provides a contact rigidity testing device for measuring deformation by using an axial extensometer, the device can measure the static normal contact rigidity of the joint surface according to different positive pressures, different test piece material characteristics and other parameters, and analyze the influence rule of the positive pressures and the test piece materials on the normal contact rigidity by using an experimental result, but because the device only adopts one axial extensometer to measure the deformation of parts, and the device does not adopt a guiding device, the measured deformation result is inaccurate, so that the contact rigidity measurement is not accurate enough. The device and the method (CN102426085A) for testing the contact rigidity of the spherical-revolution surface joint surface provide a contact rigidity testing method which utilizes a plurality of displacement sensors to measure the contact deformation and utilizes a screw to carry out loading, the method realizes stable loading, the accuracy of deformation measurement is ensured by utilizing a plurality of displacement sensors to carry out measurement, but the testing method cannot eliminate the influence of other interference deformation, so that the contact deformation of the final part is not accurate enough, and the device does not form a mature mounting clamp for mounting the part, so that the part is inconvenient to clamp.
Disclosure of Invention
Aiming at the problems of the conventional contact rigidity testing method and device, the invention provides the contact rigidity testing device and the testing method, the testing device can be used for measuring the contact rigidity of parts with different shapes and sizes, and automatic clamping of the parts is realized; the method for compensating deformation and the multipoint measurement are adopted, so that the test result is more accurate. The device has the advantages of realizing convenient and fast installation of the test parts, stable loading system and accurate contact deformation test, simultaneously compensating the contact deformation and eliminating the influence of irrelevant deformation. The problems that an existing contact rigidity testing device is large in testing result error, parts of contact rigidity testing equipment are inconvenient to clamp, the testing device is complex and the testing device is not universal are solved.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a contact rigidity testing device comprises a support 1, a loading device 2, a guiding device 3, a part clamp 4, a testing device 5, an upper part 6 and a lower part 7; the support 1 is a supporting device of the testing device, and the space inside the support 1 is used for installing the loading device 2, the guiding device 3, the part clamp 4 and the testing device 5; the testing device 5 is used for accurately measuring the contact deformation of the part; the upper part 6 and the lower part 7 are test objects and are mounted on the part holder 4.
The support 1 comprises an upper support plate 11, a bottom plate 12 and a plurality of pillars, wherein the pillars are symmetrically arranged, a stepped hole in the upper support plate 11 is matched with a stepped shaft 18 at the upper end of the pillar and is fixed through a pillar fixing nut 17, and a counter bore in the upper surface of the bottom plate 12 is connected with a stepped shaft 19 at the bottom end of the pillar to form a frame structure; a central through hole is arranged on the upper support plate 11 and is used as a loading screw guide sleeve mounting hole 14 for mounting a loading screw guide sleeve 22; a plurality of loading screw guide sleeve fixing threaded holes 16 are uniformly distributed on the upper surface of the upper support plate 11 along the periphery of the loading screw guide sleeve mounting hole 14, and a plurality of through holes are uniformly distributed on the periphery of the loading screw guide sleeve fixing threaded holes 16 and serve as guide rod support fixing unthreaded holes 15; a plurality of lower part fixture fixing threaded holes 13 are uniformly distributed on the upper surface of the bottom plate 12.
The loading device 2 comprises a loading hand wheel 21, a loading screw guide sleeve 22, a loading screw 23, a gasket 24 and a force sensor 25; the loading hand wheel 21 is fixed at the top end of the loading screw 23, and the loading screw 23 is in a threaded cylindrical structure; the loading screw guide 22 is of a cylindrical structure, the top end of the loading screw guide 22 is a convex flange edge 221, a plurality of through holes are uniformly distributed on the flange edge 221, internal threads of the loading screw guide 22 are matched with external threads on the loading screw 23, and the loading screw 23 is moved up and down by rotating the loading hand wheel 21 to provide loading force; the bottom end of the loading screw guide 22 passes through the loading screw guide mounting hole 14, the flange edge 221 is clamped on the upper surface of the upper support plate 11, and the loading screw guide 22 is fixed on the upper support plate 11 through the matching of the loading screw guide fixing bolt 222 with the through hole on the flange edge 221 and the loading screw guide fixing threaded hole 16; the force sensor 25 is placed on the upper surface of the upper part clamp body mounting device 411, the gasket 24 is placed on the force sensor 25, the bottom end of the loading screw 23 is in contact with the gasket 24, and the force sensor 25 and the gasket 24 are pressed and fixed on the upper surface of the upper part clamp body mounting device 411.
The guide device 3 comprises a guide rod bracket 31 and a guide rod 32; the guide rod bracket 31 comprises a guide rod bracket fixing upper nut 311, a guide rod bracket fixing lower nut 315, a guide rod bracket body 312 and a guide rod bracket supporting rod 314; the guide rod support body 312 is of a block structure, the center of the guide rod support body is provided with a guide rod support middle hole 313 which penetrates through the guide rod support middle hole, the lower part of the loading screw rod 23 penetrates through the guide rod support middle hole 313, and a plurality of guide rod guide holes are uniformly distributed around the guide rod support middle hole 313; a plurality of guide rod support supporting rods 314 are symmetrically fixed on the upper surface of the guide rod support body 312, the installation mode of the guide rod support supporting rods is the same as that of the guide rod support body 312 between the bottom end of a support column in the support 1 and the bottom plate 12, the upper parts of the guide rod support supporting rods are of threaded structures and penetrate through guide rod support fixing unthreaded holes 15, guide rod support fixing upper nuts 311 and guide rod support fixing lower nuts 315 are installed at the threads of the guide rod support supporting rods 314, after the guide rod support fixing upper nuts 311 and the guide rod support fixing lower nuts 315 are screwed, the guide rod support fixing upper nuts 311 and the guide rod support fixing lower nuts 315 are respectively contacted with the upper surface and the lower surface of the upper; the guide rods 32 are provided with a plurality of bottom ends which are symmetrically fixed on the upper surface of the upper part clamp body mounting device 411, the mounting mode of the guide rods is the same as that of the installation mode between the bottom end of the support column in the support 1 and the bottom plate 12, the upper parts of the guide rods are provided with threads and penetrate through guide rod guide holes, the guide rods 32 can move up and down in the guide rod guide holes, and the tops of the guide rods are limited by guide rod fixing nuts 321 to prevent the guide rods 32 from sliding out of the guide rod support body 312.
The part clamp 4 comprises an upper part clamp 41 and a lower part clamp 42;
the upper part clamp 41 comprises an upper part clamp mounting device 411 and an upper part clamp body 412 and is used for clamping the upper part 6; the upper part clamp body 412 is a cone, the top surface of the upper part clamp body is a plane, the outer surface of the upper part clamp body is an outer conical surface 4121 of the upper part clamp body, and an annular upper part clamp body locking protrusion 4122 is arranged at the upper part of the outer conical surface 4121 of the upper part clamp body; a plurality of upper part clamping slideways 4123 are symmetrically arranged at the bottom of the upper part clamp body 412 along the radial direction of the cone, an upper part clamping slideway sealing plug 4126 is arranged at the tail end of each upper part clamping slideway 4123, and the upper part clamping slideways are in interference fit and used for preventing the clamping spring 4125 from sliding out of the upper part clamping slideway 4123; an upper part clamp claw 4124 is arranged in the upper part clamping slide 4123 and can move back and forth, an upper part 6 is arranged among a plurality of upper part clamp claws 4124 to realize clamping, and a clamping spring 4125 is arranged in the upper part clamping slide 4123 between the upper part clamp claw 4124 and an upper part clamping slide sealing plug 4126 and is used for providing thrust when the upper part clamp claw 4124 slides back and forth in the upper part clamping slide 4123; the upper part clamp jaw 4124 comprises a jaw body, an upper part clamp jaw spring mounting post 41242 and an upper part clamp jaw cartridge 41243, the upper part clamp jaw spring mounting post 41242 and the upper part clamp jaw cartridge 41243 are located at the upper and lower portions of the two sides of the jaw body, respectively, the surface of the upper part of the jaw body, i.e., the upper part clamp jaw outer surface 41241, cooperates with the upper part clamping slide 4123 to enable the upper part clamp jaw 4124 to slide back and forth within the upper part clamping slide 4123; an upper part clamp jaw spring mounting post 41242 is connected to one end of a clamping spring 4125, an upper part clamp jaw cartridge 41243 in contact with the outer surface of the upper part 6 for securing the upper part 6; the upper part clamp mounting device 411 is of a block structure, and the center of the bottom of the upper part clamp mounting device is provided with an upper part clamp mounting taper hole 4112; go up part holder body installation taper hole 4112, its top surface is installation taper hole upper surface 4113, it has annular last part holder body locking groove 4111 to open on its inner wall, goes up part holder body installation taper hole upper surface 4113 and cooperatees with last part holder body 412 top surface for go up the location of part holder body 412, go up part holder body locking protrusion 4122 and cooperate with last part holder body locking groove 4111, be used for locking up part holder body 412, go up part holder body installation taper hole 4112 and cooperate with last part holder body external cone face 4121.
The lower part clamp 42 comprises a lower part clamp body 421 and a lower part clamp clamping device 422, and is used for clamping the lower part 7; the lower part clamp body 421 comprises a lower part clamp body sealing cover 4213 and a lower part clamp body 4214; the center of the lower part clamp body sealing cover 4213 is provided with a through hole, and a plurality of lower part clamping claw rails 42131 distributed along the radial direction are symmetrically arranged around the through hole and used for the lower part clamping claw 4221 to slide back and forth so as to clamp the lower part 7; a plurality of lower part clamp body sealing cover mounting holes 42135 are symmetrically formed in the lower part clamp body sealing cover 4213; the lower surface of the lower part clamp body sealing cover 4213 is provided with a small bevel gear fixing block 42133 for fixing a small bevel gear 4223, the bottom surface of the small bevel gear fixing block 42133 is in an inward sunken arc shape, and a small bevel gear upper half sliding rail 42134 with a groove structure is arranged on the small bevel gear fixing block and matched with a small bevel gear bulge 42232 to realize the rotation of the small bevel gear 4223; two side surfaces of the small bevel gear fixing block 42133 are provided with convex small bevel gear fixing block mounting slide rails 42132 for mounting a small bevel gear fixing block 42133; the bottom of the cylinder structure with an opening at the top of the lower part clamp body 4214 is provided with a flange, a plurality of lower part clamp body mounting unthreaded holes 42143 are symmetrically formed on the flange and matched with the lower part clamp body mounting bolts 4212 and the lower part clamp fixing threaded holes 13, and the lower part clamp body 421 is fixedly mounted on the upper surface of the bottom plate 12; a plurality of lower part clamp body sealing cover mounting threaded holes 42141 are symmetrically formed in the upper surface of the top of the cylinder body, are matched with the lower part clamp body sealing cover mounting holes 42135 and lower part clamp body sealing cover mounting bolts 4211, and are used for fixedly mounting a lower part clamp body sealing cover 4213 on a lower part clamp body 4214; a U-shaped bevel pinion mounting notch 42144 is formed in the upper portion of the barrel, a bevel pinion lower half sliding rail 42146 is arranged on the arc-shaped bottom surface of the bevel pinion mounting notch 42144, bevel pinion fixing block mounting grooves 42145 are formed in two vertical surfaces of the bevel pinion mounting notch 42144, the bevel pinion mounting notch 42144 is matched with a bevel pinion fixing block 42133, a bevel pinion 4223 is limited between the bevel pinion mounting notch 42144 and the bevel pinion fixing block 42133, the bevel pinion fixing block mounting grooves 42145 are matched with the bevel pinion fixing block mounting sliding rails 42132, and the bevel pinion lower half sliding rail 42146 and the bevel pinion upper half sliding rail 42134 are oppositely combined to form an annular rail; a lower part clamp body middle cylinder 42147 is arranged in the center of the lower part clamp body 4214 and is matched with a middle through hole of a lower part clamp body sealing cover 4213, and a shaft shoulder 42142 is arranged on the periphery of a lower part clamp body middle cylinder 42147 and is used for installing a bearing 4224;
the lower part clamp clamping device 422 comprises a lower part clamping claw 4221, a large bevel gear 4222, a small bevel gear 4223 and a bearing 4224; four lower part clamping claws 4221 are symmetrically arranged and comprise lower part clamping claw chucks 42211; the lower surface of the tail end of the lower part clamping jaw 42211 is provided with a bulge, the bottom of the bulge is a lower part clamping jaw thread 42213 which is matched with a large bevel gear external thread 42221 and forms self-locking, and the front end of the lower part clamping jaw 42211 is contacted with the lower part 7 so as to realize the locking and fixing of the lower part 7; a lower part clamping jaw sliding rail 42212 is arranged on the side surface of the bulge, is matched with the lower part clamping jaw rail 42131 and is used for the front and back sliding of the lower part clamping jaw 4221 so as to clamp the lower part 7; the upper surface of the large bevel gear 4222 is provided with a large bevel gear external thread 42221 which is matched with the lower part clamping claw thread 42213 and used for locking the lower part 7; the central through hole of the large bevel gear 4222 is a bearing mounting stepped hole 42222 for mounting a bearing 4224; the lower surface of the big bevel gear 4222 is provided with big bevel gear teeth 42223 which are matched with the small bevel gear teeth 42233 and used for rotating the big bevel gear 4222; the end part of the small bevel gear 4223 is provided with a small bevel gear tooth 42233 matched with a large bevel gear tooth 42223; a small bevel gear boss 42232 is arranged in the middle of the small bevel gear 4223 and is matched with the small bevel gear lower half sliding rail 42146 and the small bevel gear upper half sliding rail 42134 to realize the rotation of the small bevel gear 4223; the other end of the small bevel gear 4223 is provided with an inner hexagonal nut 42231, and an external wrench is inserted into the inner hexagonal nut 42231 to rotate the small bevel gear 4223, so that the large bevel gear 4222 is driven to rotate; the outer ring of the bearing 4224 is arranged in the bearing installation stepped hole 42222, and the inner ring of the bearing 4224 is arranged on a shaft shoulder 42142, so that the rotation of the large bevel gear 4222 is realized.
The testing device 5 comprises an upper displacement sensor 51 and a lower displacement sensor 52;
the upper displacement sensor 51 has a plurality of upper ends fixed to the side of the lower end of the upper part holder body 412 and lower ends fixed to the upper surface of the sealing cover 4213 of the lower part holder body for measuring the contact deformation between the upper part 6 and the lower part 7.
The lower displacement sensors 52 are provided in plurality, and their upper ends are fixed to the outer side surface of the lower part 7, and their lower ends are fixed to the upper surface of the sealing cover 4213 of the lower part holder body, for compensating the measurement of deformation.
The upper part 6 is of a hemispherical structure, and the upper parts 6 with different shapes and sizes can be replaced according to requirements; the lower part 7 is of a square structure, and the lower parts 7 in different shapes and sizes can be replaced according to requirements.
A contact rigidity testing method specifically comprises the following steps:
before testing, the loading hand wheel 21 is rotated to move the loading screw 23 upwards, and then the upper part clamp 41 is manually moved upwards to install a test part; the upper part 6 is mounted at the center position of the lower surface of the upper part clamp body 412, and the upper part 6 is fixed by adjusting the left and right positions of the upper part clamp jaw clamp 41243; then, the lower part clamping claw 4221 is moved outward by rotating the hexagon socket nut 42231 on the bevel pinion 4223, the lower part 7 is placed on the upper part clamp body 412, and the hexagon socket nut 42231 is rotated again to move the lower part clamping claw 4221 inward synchronously to clamp the lower part 7; the upper part clamp 41 is moved downwards in a manual mode, so that the upper part 6 is in contact with the lower part 7, and the installation of the parts is completed; then, an upper displacement sensor 51 and a lower displacement sensor 52 are arranged according to the positions of the sensors; finally, the loading hand wheel 21 is rotated to apply contact force to the test part, and the deformation of the test part is tested.
The deformation tested by the upper displacement sensor 51 is the sum of the contact deformation between the parts and the rest interference deformation below the parts, and the interference deformation is the compensation deformation; the deformation tested by the lower displacement sensor 52 is the rest interference deformation below the part; the contact stiffness between the tested parts is calculated as follows:
wherein, KcThe contact stiffness between the tested parts; f is the load applied by the loading device 2; delta1The average value of the measured deformation of the upper displacement sensor 51; delta2The average of the measured deformations of the lower displacement sensor 52; delta1a、δ1b、δ1cAnd delta1dThe deformation amounts measured by the four upper displacement sensors 51, respectively; delta2a、δ2b、δ2cAnd delta2dRespectively, the four lower displacement sensors 52.
The invention has the beneficial effects that:
the invention realizes simple installation and replacement of test parts and stable loading, simultaneously adopts a plurality of sensors to carry out deformation measurement, and utilizes a method for compensating deformation to eliminate the influence of irrelevant deformation and achieve the accurate measurement of contact rigidity. The invention solves the problems of inconvenient part installation, complex test method, inaccurate test result and the like of the existing contact rigidity test device.
Drawings
FIG. 1 is a schematic overall view of the test apparatus of the present invention;
FIG. 2 is a schematic view of a stent;
FIG. 3 is a schematic view of a loading device;
FIG. 4 is a schematic view of a guide;
FIG. 5 is a schematic view of a part holder;
FIG. 6 is a schematic view of an upper part holder installation apparatus;
FIG. 7 is a schematic view of the upper part clamp;
FIG. 8 is a schematic view of an upper part clamp jaw;
FIG. 9 is a schematic view of a lower part clamp;
FIG. 10 is a cross-sectional view of the lower part clamp;
FIG. 11 is a schematic view of a lower part clamp body seal cap;
FIG. 12 is a schematic view of the lower part clamp body;
FIG. 13 is a lower part clamp bevel gear fit schematic;
FIG. 14 is a lower part clamp bevel gear mating section view;
FIG. 15 is a schematic view of the lower part clamping jaw;
FIG. 16 is a schematic view of a test apparatus.
In the figure: 1, a bracket; 2, a loading device; 3, a guiding device; 4, part clamping; 5, testing the device; 6, mounting parts; 7, lower parts;
11, an upper supporting plate; 12 a base plate; 13, fixing a threaded hole of a lower part clamp; 14 loading a screw guide sleeve mounting hole; 15 guide rod support fixing unthreaded hole; a loading screw guide sleeve fixing threaded hole 16; a post fixing nut 17; a pillar upper end stepped shaft 18; a pillar bottom step shaft 19;
21 loading a hand wheel; 22 loading the screw guide sleeve; 23 loading the screw; 24 a gasket; 25 force sensors;
221 a flange edge; 222 loading a screw guide sleeve fixing bolt;
31 a guide bar support; 32 a guide bar;
311 the guide rod bracket is fixed with an upper bolt; 312 a guide rod support body; 313 guide rod support middle hole; 314 guide bar support struts; 315 the guide bar support fixes the lower bolt;
321 guide bar fixing bolts;
41, mounting a part clamp; 42 lower part clamp;
411 parts holder mounting means; 412 a part clamp body;
4111, locking a groove on a part clamp body; 4112 mounting a taper hole on the part clamp body; 4113 mounting the upper surface of the taper hole on the upper part clamp body;
4121 outer conical surface of the upper part clamp body; 4122 locking projection of the part clamp body; 4123 upper part clamping slides; 4124 upper part clamp jaws; 4125 clamping the spring; 4126 clamping the slide closure with the upper part;
41241 the outer surface of the part holder jaw; 41242 mounting posts for part clamp jaw springs; 41243 upper part holder jaw cartridge;
421 parts clamp bodies; 422 lower part clamp clamping device;
4211 installing bolts on sealing covers of lower part clamp bodies; 4212 installing bolts on the lower part clamp body; 4213 sealing cover of lower part clamp; 4214 lower part clamp body;
42131 lower part clamp jaw track; 42132 the small bevel gear fixing block is provided with a slide rail; 42133 small bevel gear fixing block; 42134 upper half slide rail of small bevel gear; 42135 lower part clamp body sealing cover mounting hole;
41241 the sealing cover of the lower part clamp body is provided with a threaded hole; 42142 shaft shoulder; 42143 the lower part clamp body is provided with a unthreaded hole; 42144 small bevel gear mounting notch; 42145 mounting groove for fixing block of bevel pinion; 42146 lower half slide rail of small bevel gear; 42147 lower part clamp body middle cylinder;
4221 lower part clamping claw; 4222 big bevel gear; 4223 bevel pinion; 4224 bearing;
42211 lower part clamping jaw chuck; 42212 lower part clamping jaw slide rail; 42213 lower part clamping jaw thread;
42221 big bevel gear external thread; 42222 mounting stepped hole for bearing; 42223 large bevel gear teeth;
42231 hexagon socket nut; 42232 small bevel gear projection; 42233 bevel pinion teeth;
an upper 51 displacement sensor; a displacement sensor under 52;
Detailed Description
The following combines the attached drawings and the technical scheme; further illustrating embodiments of the present invention.
As can be seen from fig. 1: a contact rigidity testing device comprises a support 1, a loading device 2, a guiding device 3, a part clamp 4, a testing device 5, an upper part 6 and a lower part 7. The bracket 1 is a supporting device of the testing device; the loading device 2 comprises a loading hand wheel 21, a loading screw guide sleeve 22, a loading screw 23, a gasket 24 and a force sensor 25; the guide device 3 includes a guide bar holder 31 and a guide bar 32; the part clamp 4 comprises an upper part clamp 41 and a lower part clamp 42; the testing device 5 comprises four upper displacement sensors 51 and four lower displacement sensors 52, and the upper and lower displacement sensors are matched for use and are used for accurately measuring the contact deformation of parts; the upper part 6 and the lower part 7 are test objects, and the sizes and the shapes of the parts can be changed according to requirements.
As shown in fig. 2, the stand 1 includes an upper support plate 11, a bottom plate 12, and a pillar; the four loading screw guide sleeve fixing threaded holes 16 are uniformly distributed on the upper supporting plate 11; the guide rod bracket fixing unthreaded holes 15 are through holes, and are four in total and are uniformly distributed on the upper supporting plate 11; the loading screw guide sleeve mounting hole 14 is a mounting hole of a loading screw guide sleeve 22; the four lower part clamp fixing threaded holes 13 are uniformly distributed on the bottom plate 12; the stepped hole on the upper supporting plate 11 is matched with the stepped shaft 18 at the upper end of the pillar and is fixed by the pillar fixing nut 17, and the counter bore on the upper surface of the bottom plate 12 is connected with the stepped shaft 19 at the bottom end of the pillar to form a frame structure.
As shown in fig. 3, the loading hand wheel 21 is located above the loading screw 23 and is integrated with the loading screw 23; the loading screw guide sleeve 22 is of an annular structure with a flange edge 221; the flange edge 221 is positioned above the loading screw guide 22 and used for supporting the loading screw guide 22, 4 loading screw guide fixing bolts 222 are uniformly distributed on the upper surface of the flange edge 221, and the loading screw guide 22 is fixed on the bracket 1 through the light hole on the flange edge 221, the loading screw guide fixing threaded hole 16 on the bracket 1 and the loading screw guide fixing bolts 222; the loading screw 23 is a threaded cylindrical structure; the loading screw 23 is matched with a middle threaded hole of the loading screw guide sleeve 22 to provide loading force; the force sensor 25 is positioned on the upper surface of the upper part clamp body mounting device 411, and the gasket 24 is of a round cake-shaped structure and is arranged on the force sensor 25; the gasket 24 and the screw 23 are coaxial, the upper surface of the gasket 24 is attached to the lower surface of the screw 23, and the force sensor 25 is used for testing the magnitude of the loading force.
As shown in fig. 4 and 5, the guide bar bracket 31 includes a guide bar bracket fixing upper nut 311, a guide bar bracket fixing lower nut 315, a guide bar bracket body 312, and a guide bar bracket support rod 314; four guide rod guide holes are uniformly distributed on the guide rod bracket body 312, and the guide rods 32 slide up and down in the guide rod guide holes; the middle hole 313 of the guide rod bracket is a circular through hole, and the loading screw 23 is positioned in the middle of the middle hole 313 of the guide rod bracket; the number of the guide rod support rods 314 is four, the four guide rod support rods are respectively located in the guide rod support fixing unthreaded holes 15, the upper portions and the lower portions of the four guide rod support fixing upper nuts 311 and the guide rod support fixing lower nuts 315 are respectively fixed, the guide rod support fixing upper nuts 311 are in contact with the upper surface of the upper support plate 11, and the guide rod support fixing lower nuts 315 are in contact with the lower surface of the upper support plate 11. Four guide rods 32 are provided, and the bottom of each guide rod is fixed on the upper surface of the upper part clamp body mounting device 411; four guide bar fixing nuts 321 are respectively matched with the threads on the guide bar 32 for preventing the guide bar 32 from sliding out of the guide bar support body 312.
As shown in fig. 6, 7 and 8, the upper parts clamp 41 includes an upper parts clamp mounting device 411 and an upper parts clamp body 412; the upper part clamp mounting device 411 is provided with an upper part clamp body locking groove 4111 and an upper part clamp body mounting taper hole 4112; the upper part holder locking groove 4111 cooperates with the upper part holder locking protrusion 4122 for locking the upper part holder 412; the upper part fixture mounting taper hole 4112 is matched with the outer taper surface 4121 of the upper part fixture; the upper part holder body mounting taper hole upper surface 4113 mates with the upper surface of the upper part holder body 412 for positioning of the upper part holder body 412. The upper part clamp body 412 is provided with an upper part clamp body locking bulge 4122, an upper part clamping slideway 4123, an upper part clamp claw 4124, a clamping spring 4125 and an upper part clamping slideway sealing plug 4126; the outer conical surface 4121 of the upper part clamp body is matched with the mounting conical hole 4112 of the upper part clamp body; the upper part clamp body locking protrusion 4122 is matched with the upper part clamp body locking groove 4111 for locking the upper part clamp body 412; four upper part clamping slides 4123 are uniformly distributed below the upper part clamp body for mounting an upper part clamp claw 4124, a clamping spring 4125 and an upper part clamping slide closure 4126, and simultaneously the upper part clamp claw 4124 can move back and forth in the upper part clamping slide 4123 so as to clamp the upper part 6; the upper part clamp jaw 4124 includes an upper part clamp jaw outer surface 41241, an upper part clamp jaw spring mounting post 41242, and an upper part clamp jaw cartridge 41243; the upper part clamp jaw outer surface 41241 mates with the upper part clamping slide 4123 such that the upper part clamp jaw 4124 can slide back and forth within the upper part clamping slide 4123; an upper part clamp jaw spring mounting post 41242 for attachment to one end of a clamping spring 4125; the upper part clamp jaw cartridge 41243 is in contact with the outer surface of the upper part 6 for fixing the upper part 6; four clamping springs 4125, respectively disposed in the upper part clamping slide 4123, the clamping springs 4125 having one end connected to the upper part clamp jaw spring mounting post 41242 and one end connected to the upper part clamping slide closure 4126 for providing thrust for the upper part clamp jaw 4124 sliding back and forth in the upper part clamping slide 4123; four upper part clamping slide closure plugs 4126 are respectively mounted at the ends of the upper part clamping slides 4123, and the outer surface of the upper part clamping slide closure plugs 4126 is in interference fit with the upper part clamping slides 4123 to prevent the clamping springs 4125 from sliding out of the upper part clamping slides 4123.
As shown in fig. 8 and 10, lower part holder 42 includes a lower part holder body 421 and a lower part holder clamping device 422. The lower part clamp body 421 includes a lower part clamp body seal cover 4213, a lower part clamp body seal cover mounting bolt 4211, a lower part clamp body main body 4214, and a lower part clamp body main body mounting bolt 4212.
As shown in fig. 11, a lower part clamp body sealing cover 4213 is provided with a lower part clamping claw rail 42131, a lower part clamp body sealing cover mounting hole 42135, a bevel pinion fixing block 42133, a bevel pinion fixing block mounting slide rail 42132 and a bevel pinion upper half slide rail 42134; four lower part gripping pawl rails 42131 for the lower part gripping pawl 4221 to slide back and forth to grip the lower part 7; five lower part clamp body sealing cover mounting holes 42135 are respectively matched with the lower part clamp body sealing cover mounting bolts 4211 and used for mounting and fixing a lower part clamp body sealing cover 4213; the bevel pinion fixing block 42133 is mounted in the lower part clamp body 4214 and used for fixing a bevel pinion 4223; the small bevel gear fixed block mounting slide rail 42132 is of a convex structure, so that the small bevel gear fixed block 42133 can be conveniently mounted; the upper half sliding rail 42134 of the small bevel gear is a groove which is matched with a bulge on the small bevel gear 4223 and used for the rotation of the small bevel gear 4223. The lower part clamp body sealing cover mounting bolts 4211 are totally five and are used for mounting and fixing the lower part clamp body sealing cover 4213.
As shown in fig. 12, the lower part clamp body 4214 comprises a lower part clamp body seal cover mounting threaded hole 42141, a shaft shoulder 42142, a lower part clamp body mounting unthreaded hole 42143, a bevel pinion mounting notch 42144, a bevel pinion fixed block mounting groove 42145, a bevel pinion lower half slide rail 42146 and a lower part clamp body middle cylinder 42147; the lower part clamp body sealing cover mounting threaded hole 42141 is matched with a lower part clamp body sealing cover mounting bolt 4211 and used for mounting and fixing a lower part clamp body sealing cover 4213; the shaft shoulder 42142 is used for mounting a bearing 4224; the lower part clamp body mounting unthreaded hole 42143 is matched with a lower part clamp body mounting bolt 4212 and is used for mounting and fixing the lower part clamp body 421; the small bevel gear mounting notch 42144 is matched with the small bevel gear fixing block 42133 and is used for mounting a small bevel gear 4223; the small bevel gear fixing block mounting groove 42145 is matched with a small bevel gear fixing block mounting slide rail 42132; the lower bevel pinion half rail 42146 is a groove structure, and is formed together with the upper bevel pinion half rail 42134 to complete a circular ring for mounting the bevel pinion 4223; the lower part holder body mid-cylinder 42147 is a cylindrical structure that fits into a mid-annular hole in the lower part holder body seal 4213. The lower part holder body mounting bolts 4212 are four in number, are mounted in the lower part holder body mounting unthreaded holes 42143, and are used for fixing the lower part holder body 421.
As shown in fig. 13, the lower part clamp gripping device 422 includes lower part clamping jaws 4221, a large bevel gear 4222, a small bevel gear 4223, and a bearing 4224.
As shown in fig. 13, 14 and 15, the lower part clamping jaw 4221 comprises a lower part clamping jaw cartridge 42211, a lower part clamping jaw slide track 42212 and a lower part clamping jaw thread 42213; the lower part clamping jaw 42211 is positioned at the front end of the lower part clamping jaw 4221, is directly contacted with the lower part 7 and is used for fixing the lower part 7; the lower part clamping jaw slide rail 42212 is matched with a lower part clamping jaw rail 42131 on the lower part clamp body sealing cover 4213 and is used for the front and back sliding of the lower part clamping jaw 4221 so as to clamp the lower part 7; the lower part clamp jaw threads 42213 mate with the large bevel gear external threads 42221 and form a self-lock for locking the lower part 7.
As shown in fig. 13 and 14, the large bevel gear 4222 is provided with a large bevel gear external thread 42221, a bearing mounting stepped hole 42222 and large bevel gear teeth 42223; the external thread 42221 of the large bevel gear is matched with the thread 42213 of the lower part clamping claw and used for locking the lower part 7; the bearing mounting stepped hole 42222 is positioned at the lower middle end of the large bevel gear 4222 and is used for mounting a bearing 4224; the large bevel gear teeth 42223 are evenly distributed on the lower surface of the large bevel gear 4222, are matched with the small bevel gear teeth 42233 and are used for rotating the large bevel gear 4222. The small bevel gear 4223 comprises a hexagon socket nut 42231, a small bevel gear bulge 42232 and small bevel gear teeth 42233; the inner hexagon nut 42231 is used for rotating the small bevel gear 4223 so as to drive the large bevel gear 4222 to rotate; the small bevel gear boss 42232 is matched with the small bevel gear lower half sliding rail 42146 and the small bevel gear upper half sliding rail 42134 and used for rotation of the small bevel gear; the small bevel gear teeth 42233 mate with the large bevel gear teeth 42223. The outer ring of the bearing 4224 is mounted in the bearing mounting stepped hole 42222, and the inner ring is mounted on a shaft shoulder 42142 for smooth rotation of the large bevel gear 4222.
As shown in fig. 16, the upper displacement sensors 51 have four upper displacement sensors, one end of each sensor is fixed to the periphery of the lower end of the upper part holder body 412, and the other end of each sensor is fixed to the upper surface of the lower part holder body seal cover 4213, and are used for measuring the contact deformation between the upper part 6 and the lower part 7. The number of the lower displacement sensors 52 is four, one end of each lower displacement sensor is fixed on the periphery of the lower part 7, and the other end of each lower displacement sensor is fixed on the upper surface of the sealing cover 4213 of the lower part clamp body and used for measuring compensation deformation.
The upper part 6 is of a hemispherical structure, and the upper parts 6 with different shapes and sizes can be replaced according to requirements; the lower part 7 is of a square structure, and the lower parts 7 with different shapes and different sizes can be replaced according to requirements.
Contact stiffness test principle:
because the lower part clamp body sealing cover 4213 and the lower part clamp body middle cylinder 42147 are not an integral structure, the load applied by the loading device 2 does not affect the lower part clamp body sealing cover 4213, so the deformation tested by the upper displacement sensor 51 is the sum of the contact deformation between the parts and the rest interference deformation (compensation deformation) below the parts, the deformation tested by the lower displacement sensor 52 is the rest interference deformation (compensation deformation) below the parts, and according to the above-mentioned testing method, the testing principle of the contact rigidity is (the given calculation formula takes four upper displacement sensors and four lower displacement sensors as an example, if the number of the sensors is increased, the principle is the same):
wherein, KcThe contact stiffness between the tested parts; f is loadingThe load applied by the device 2; delta1The average value of the deformation tested by the upper displacement sensor (the sum of the contact deformation and the compensation deformation between the parts); delta2The average value of the deformation tested by the lower displacement sensor (compensation deformation); delta1aThe amount of deformation measured for the first upper displacement sensor; delta1bThe measured deflection for the second upper displacement sensor; delta1cThe amount of deformation tested for the third upper displacement sensor; delta1dThe amount of deformation tested for the fourth upper displacement sensor; delta2aThe deformation measured for the first lower displacement sensor; delta2bThe measured deflection for the second lower displacement sensor; delta2cThe deformation measured for the third lower displacement sensor; delta2dThe deformation measured for the fourth lower displacement sensor.
Claims (2)
1. The contact rigidity testing device is characterized by comprising a support (1), a loading device (2), a guide device (3), a part clamp (4), a testing device (5), an upper part (6) and a lower part (7); the support (1) is a supporting device of the testing device, and the space inside the support (1) is used for installing the loading device (2), the guiding device (3), the part clamp (4) and the testing device (5); the testing device (5) is used for accurately measuring the contact deformation of the part; the upper part (6) and the lower part (7) are test objects and are arranged on the part clamp (4);
the support (1) comprises an upper support plate (11), a bottom plate (12) and a plurality of pillars, wherein the pillars are symmetrically arranged, a stepped hole in the upper support plate (11) is matched with a stepped shaft (18) at the upper end of the pillar and is fixed through a pillar fixing nut (17), and a counter bore in the upper surface of the bottom plate (12) is connected with a stepped shaft (19) at the bottom end of the pillar to form a frame structure; a central through hole is arranged on the upper supporting plate (11) and is used as a loading screw guide sleeve mounting hole (14) for mounting a loading screw guide sleeve (22); a plurality of loading screw guide sleeve fixing threaded holes (16) are uniformly distributed on the upper surface of the upper supporting plate (11) along the periphery of the loading screw guide sleeve mounting hole (14), and a plurality of through holes are uniformly distributed on the periphery of the loading screw guide sleeve fixing threaded holes (16) and serve as guide rod support fixing unthreaded holes (15); a plurality of lower part clamp fixing threaded holes (13) are uniformly distributed on the upper surface of the bottom plate (12);
the loading device (2) comprises a loading hand wheel (21), a loading screw guide sleeve (22), a loading screw (23), a gasket (24) and a force sensor (25); the loading hand wheel (21) is fixed at the top end of the loading screw rod (23), and the loading screw rod (23) is of a threaded columnar structure; the loading screw guide sleeve (22) is of a cylindrical structure, the top end of the loading screw guide sleeve is provided with a convex flange edge (221), a plurality of through holes are uniformly distributed on the flange edge (221), the internal thread of the loading screw guide sleeve (22) is matched with the external thread on the loading screw (23), and the loading screw (23) is moved up and down by rotating the loading hand wheel (21) to provide loading force; the bottom end of the loading screw guide sleeve (22) penetrates through the loading screw guide sleeve mounting hole (14), the flange edge (221) is clamped on the upper surface of the upper support plate (11), and the loading screw guide sleeve (22) is fixed on the upper support plate (11) through the matching of a loading screw guide sleeve fixing bolt (222) with a through hole in the flange edge (221) and a loading screw guide sleeve fixing threaded hole (16); the force sensor (25) is placed on the upper surface of the upper part clamp body mounting device (411), the gasket (24) is placed on the force sensor (25), the bottom end of the loading screw rod (23) is in contact with the gasket (24), and the force sensor (25) and the gasket (24) are pressed and fixed on the upper surface of the upper part clamp body mounting device (411);
the guide device (3) comprises a guide rod bracket (31) and a guide rod (32); the guide rod bracket (31) comprises a guide rod bracket fixing upper nut (311), a guide rod bracket fixing lower nut (315), a guide rod bracket body (312) and a guide rod bracket supporting rod (314); the guide rod support body (312) is of a block structure, a guide rod support middle hole (313) penetrating through the center of the guide rod support body is formed in the center of the guide rod support body, the lower portion of the loading screw rod (23) penetrates through the guide rod support middle hole (313), and a plurality of guide rod guide holes are uniformly distributed around the guide rod support middle hole (313); a plurality of guide rod support supporting rods (314) are symmetrically fixed on the upper surface of a guide rod support body (312), the installation mode of the guide rod support supporting rods is the same as that of the support (1) between the bottom end of a strut and a bottom plate (12), the upper parts of the guide rod support supporting rods are of threaded structures and penetrate through guide rod support fixing unthreaded holes (15), guide rod support fixing upper nuts (311) and guide rod support fixing lower nuts (315) are installed at the threads of the guide rod support supporting rods (314), after the guide rod support fixing upper nuts (311) and the guide rod support fixing lower nuts (315) are screwed, the guide rod support fixing upper nuts (311) and the guide rod support fixing lower nuts (315) are respectively contacted with the upper surface and the lower surface of an upper supporting plate (11), and the guide rod support supporting; the bottom ends of the guide rods (32) are symmetrically fixed on the upper surface of the upper part clamp body mounting device (411) in the same way as the mounting way between the bottom end of a strut in the support (1) and the bottom plate (12), the upper parts of the guide rods are provided with threads and penetrate through guide rod guide holes, the guide rods (32) can move up and down in the guide rod guide holes, and the tops of the guide rods are limited by guide rod fixing nuts (321) to prevent the guide rods (32) from sliding out of the guide rod support body (312);
the part clamp (4) comprises an upper part clamp (41) and a lower part clamp (42);
the upper part clamp (41) comprises an upper part clamp mounting device (411) and an upper part clamp body (412) and is used for clamping an upper part (6); the upper part clamp body (412) is a cone, the top surface of the upper part clamp body is a plane, the outer surface of the upper part clamp body is an outer conical surface (4121) of the upper part clamp body, and the upper part of the outer conical surface (4121) of the upper part clamp body is provided with an annular upper part clamp body locking bulge (4122); a plurality of upper part clamping slideways (4123) are symmetrically arranged at the bottom of the upper part clamp body (412) along the radial direction of the cone, an upper part clamping slideway sealing plug (4126) is arranged at the tail end of each upper part clamping slideway (4123), and the upper part clamping slideway sealing plug are in interference fit and used for preventing a clamping spring (4125) from sliding out of the upper part clamping slideway (4123); the upper part clamp claw (4124) is arranged in the upper part clamping slide way (4123) and can move back and forth, the upper part (6) is arranged among the upper part clamp claws (4124) to realize clamping, and a clamping spring (4125) is arranged in the upper part clamping slide way (4123) between the upper part clamp claw (4124) and the upper part clamping slide way sealing plug (4126) and is used for providing thrust when the upper part clamp claw (4124) slides back and forth in the upper part clamping slide way (4123); the upper part clamp claw (4124) comprises a claw body, an upper part clamp claw spring mounting column (41242) and an upper part clamp claw clamping head (41243), the upper part clamp claw spring mounting column (41242) and the upper part clamp claw clamping head (41243) are respectively positioned at the upper part and the lower part of two sides of the claw body, the surface of the upper part of the claw body, namely the outer surface (41241) of the upper part clamp claw is matched with the upper part clamping slideway (4123), so that the upper part clamp claw (4124) slides forwards and backwards in the upper part clamping slideway (4123); an upper part clamp jaw spring mounting post (41242) is connected to one end of a clamping spring (4125), an upper part clamp jaw cartridge (41243) is in contact with the outer surface of the upper part (6) for securing the upper part (6); the upper part clamp mounting device (411) is of a block structure, and the center of the bottom of the upper part clamp mounting device is provided with an upper part clamp mounting taper hole (4112); the upper part clamp body is provided with a conical hole (4112), the top surface of the upper part clamp body is provided with an upper surface (4113) of the mounting conical hole, the inner wall of the upper part clamp body is provided with an annular upper part clamp body locking groove (4111), the upper surface (4113) of the mounting conical hole of the upper part clamp body is matched with the top surface of the upper part clamp body (412) and used for positioning the upper part clamp body (412), an upper part clamp body locking protrusion (4122) is matched with the upper part clamp body locking groove (4111) and used for locking the upper part clamp body (412), and the mounting conical hole (4112) of the upper part clamp body is matched with an outer conical surface (4121) of the upper part clamp body;
the lower part clamp (42) comprises a lower part clamp body (421) and a lower part clamp clamping device (422) and is used for clamping the lower part (7); the lower part clamp body (421) comprises a lower part clamp body sealing cover (4213) and a lower part clamp body main body (4214); the center of the lower part clamp body sealing cover (4213) is provided with a through hole, and a plurality of lower part clamping claw rails (42131) distributed along the radial direction are symmetrically arranged around the through hole and used for the lower part clamping claw (4221) to slide back and forth so as to clamp the lower part (7); a plurality of lower part clamp body sealing cover mounting holes (42135) are symmetrically formed in the lower part clamp body sealing cover (4213); the lower surface of the lower part clamp body sealing cover (4213) is provided with a small bevel gear fixing block (42133) for fixing a small bevel gear (4223), the bottom surface of the small bevel gear fixing block (42133) is in an inwards sunken arc shape, and a small bevel gear upper half sliding rail (42134) with a groove structure is arranged on the small bevel gear fixing block and matched with a small bevel gear protrusion 42232 to realize the rotation of the small bevel gear (4223); two side surfaces of the small bevel gear fixing block (42133) are provided with convex small bevel gear fixing block mounting slide rails (42132) for mounting the small bevel gear fixing block (42133); the bottom of the cylinder structure with an opening at the top of the lower part clamp body main body (4214) is provided with a flange, a plurality of lower part clamp body main body mounting unthreaded holes (42143) are symmetrically formed in the flange and matched with lower part clamp body mounting bolts (4212) and lower part clamp fixing threaded holes (13), and the lower part clamp body (421) is fixedly mounted on the upper surface of the bottom plate (12); a plurality of lower part clamp body sealing cover mounting threaded holes (42141) are symmetrically formed in the upper surface of the top of the barrel body, are matched with lower part clamp body sealing cover mounting holes (42135) and lower part clamp body sealing cover mounting bolts (4211), and are used for fixedly mounting a lower part clamp body sealing cover (4213) on a lower part clamp body main body (4214); a U-shaped bevel pinion mounting notch (42144) is formed in the upper portion of the barrel, a bevel pinion lower half sliding rail (42146) is arranged on the arc-shaped bottom surface of the bevel pinion mounting notch (42144), bevel pinion fixing block mounting grooves (42145) are formed in the two vertical surfaces of the bevel pinion mounting notch (42144), the bevel pinion mounting notch (42144) is matched with a bevel pinion fixing block (42133), a bevel pinion (4223) is limited between the bevel pinion mounting notch (42144) and the bevel pinion fixing block (42133), the bevel pinion fixing block mounting groove (42145) is matched with the bevel pinion fixing block mounting sliding rail (42132), and the bevel pinion lower half sliding rail (42146) and the bevel pinion upper half sliding rail (42134) are matched to form an annular rail; a lower part clamp body middle cylinder (42147) is arranged in the center of the lower part clamp body main body (4214) and is matched with a middle through hole of a lower part clamp body sealing cover (4213), and a shaft shoulder (42142) is arranged on the periphery of the lower part clamp body middle cylinder (42147) and is used for installing a bearing (4224);
the lower part clamp clamping device (422) comprises a lower part clamping claw (4221), a large bevel gear (4222), a small bevel gear (4223) and a bearing (4224); the four lower part clamping claws (4221) are symmetrically arranged and comprise lower part clamping claw chucks (42211); the lower surface of the tail end of the lower part clamping jaw chuck (42211) is provided with a bulge, the bottom of the bulge is provided with a lower part clamping jaw thread (42213) which is matched with the external thread 42221 of the large bevel gear and forms self-locking, and the front end of the lower part clamping jaw chuck (42211) is contacted with the lower part (7) so as to realize the locking and fixing of the lower part (7); a lower part clamping claw slide rail 42212 is arranged on the side surface of the bulge, is matched with the lower part clamping claw track (42131) and is used for the front and back sliding of the lower part clamping claw (4221) so as to clamp the lower part (7); the upper surface of the large bevel gear (4222) is provided with a large bevel gear external thread 42221 which is matched with a lower part clamping claw thread (42213) and used for locking a lower part (7); the central through hole of the large bevel gear (4222) is a bearing mounting stepped hole (42222) for mounting a bearing (4224); the lower surface of the big bevel gear (4222) is provided with big bevel gear teeth (42223) which are matched with the small bevel gear (teeth 42233) and used for rotating the big bevel gear (4222); the end part of the small bevel gear (4223) is provided with a small bevel gear (teeth 42233) which is matched with the gear teeth (42223) of the large bevel gear; a small bevel gear boss 42232 is arranged in the middle of the small bevel gear (4223) and is matched with a small bevel gear lower half sliding rail (42146) and a small bevel gear upper half sliding rail (42134) to realize the rotation of the small bevel gear (4223); the other end of the small bevel gear (4223) is provided with an inner hexagonal nut (42231), and an external wrench is inserted into the inner hexagonal nut (42231) to rotate the small bevel gear (4223), so that the large bevel gear (4222) is driven to rotate; the outer ring of the bearing (4224) is arranged in a bearing installation stepped hole (42222), the inner ring of the bearing (4224) is arranged on a shaft shoulder (42142), and the rotation of a large bevel gear (4222) is realized;
the testing device (5) comprises an upper displacement sensor (51) and a lower displacement sensor (52);
the upper displacement sensors (51) are multiple, the upper ends of the upper displacement sensors are fixed on the side surface of the lower end of the upper part clamp body (412), the lower ends of the upper displacement sensors are fixed on the upper surface of a sealing cover (4213) of the lower part clamp body, and the upper displacement sensors are used for measuring contact deformation between the upper part (6) and the lower part (7);
the upper ends of the lower displacement sensors (52) are fixed on the outer side surface of the lower part (7), and the lower ends of the lower displacement sensors are fixed on the upper surface of a sealing cover (4213) of the lower part clamp body and used for measuring compensation deformation;
the upper part (6) is of a hemispherical structure, and the upper parts (6) with different shapes and sizes can be replaced according to requirements; the lower part (7) is of a square structure, and the lower parts (7) in different shapes and sizes can be replaced according to requirements.
2. A contact rigidity testing method adopts the contact rigidity testing device of claim 1, and is characterized by comprising the following steps:
before testing, the loading hand wheel (21) is rotated to move the loading screw rod (23) upwards, and then the upper part clamp (41) is moved upwards in a manual mode to install a testing part; the upper part (6) is arranged at the central position of the lower surface of the upper part clamp body (412), and the upper part (6) is fixed by adjusting the left and right positions of the upper part clamp claw clamp head (41243); then, the lower part clamping claw (4221) is moved outwards by rotating the inner hexagonal nut (42231) on the small bevel gear (4223), the lower part (7) is placed on the upper part clamp body (412), and the inner hexagonal nut (42231) is rotated again to enable the lower part clamping claw (4221) to move inwards synchronously so as to clamp the lower part (7); the upper part clamp (41) is moved downwards in a manual mode, so that the upper part (6) is contacted with the lower part (7), and the installation of the parts is completed; then arranging an upper displacement sensor (51) and a lower displacement sensor (52) according to the positions of the sensors; finally, a loading hand wheel (21) is rotated to apply contact force to the tested part and test the deformation of the part;
the deformation tested by the upper displacement sensor (51) is the sum of the contact deformation between the parts and the other interference deformation below the parts, and the interference deformation is the compensation deformation; the deformation tested by the lower displacement sensor (52) is the other interference deformation below the part; the contact stiffness between the tested parts is calculated as follows:
wherein, KcThe contact stiffness between the tested parts; f is the load applied by the loading device (2); delta1Is the average value of the measured deformations of the upper displacement sensor (51); delta2Is a lower displacement sensor (52)) Average value of the measured deformation; delta1a、δ1b、δ1cAnd delta1dThe deformation amounts respectively measured by the four upper displacement sensors (51); delta2a、δ2b、δ2cAnd delta2dRespectively, the deformation tested by the four lower displacement sensors (52).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911357910.4A CN111024341A (en) | 2019-12-25 | 2019-12-25 | Contact rigidity testing device and testing method |
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| CN201911357910.4A CN111024341A (en) | 2019-12-25 | 2019-12-25 | Contact rigidity testing device and testing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114608769A (en) * | 2022-03-09 | 2022-06-10 | 广州机械科学研究院有限公司 | System and method for testing contact rigidity of brake caliper and brake back plate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114608769A (en) * | 2022-03-09 | 2022-06-10 | 广州机械科学研究院有限公司 | System and method for testing contact rigidity of brake caliper and brake back plate |
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