CN103389205B - A kind of device detecting combination property under ball screw assembly, stress state - Google Patents
A kind of device detecting combination property under ball screw assembly, stress state Download PDFInfo
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- CN103389205B CN103389205B CN201310303743.1A CN201310303743A CN103389205B CN 103389205 B CN103389205 B CN 103389205B CN 201310303743 A CN201310303743 A CN 201310303743A CN 103389205 B CN103389205 B CN 103389205B
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Abstract
A kind of device detecting combination property under ball screw assembly, stress state, comprise testing table fuselage, testing table fuselage is fixed on cast iron platform, one end of testing table fuselage is provided with servomotor, the output shaft of servomotor is connected with ball screw assembly, one end with the second shaft coupling through the first shaft coupling, dynamic torque sensor, the other end of testing table fuselage is provided with current vortex sensor and rotary encoder, testing table fuselage is provided with grating scale and infrared temperature sensor; Described testing table fuselage is provided with rolling guide, rolling guide is arranged analog operation platform, analog operation platform connects rolling guide by rolling guide slide block, and analog operation platform is connected with charger; Rolling ball screw pair screw nut is arranged on analog operation platform by nut bearing.Stable performance of the present invention, motion and test response speed are fast, and comprehensively, accurately, apparatus structure is simple for test performance parameter, can realize the inspect on colligated-function of ball screw assembly, under zero load and stress state of different model.
Description
Technical field
The invention belongs to the field of high speed and precision transmission detection device for combination property, particularly a kind of device detecting combination property under ball screw assembly, stress state.
Background technology
In the last few years, the fast development of the important industries such as China's Aero-Space, national defence, boats and ships, electric power, the energy and automobile, proposed very high requirement to the performance of various machining equipment.But on the whole, the equipment manufacture development level of current China also also exists larger gap compared with the industrially developed country such as the U.S., Germany, Japan, many gordian techniquies and functional part still belong to blank at home, quite a few is for the high-grade, digitally controlled machine tools of high speed, high precision processing, and the key feature etc. manufactured needed for this type of lathe, the still external import of main dependence.And this wherein, just include the functional parts such as high speed, the necessary precision ball screw of heavily loaded process unit and rolling guide.As the key feature in numerically-controlled machine servo feed drive system and machining center core transmission component, their manufacture level and performance affect to a great extent and govern the overall performance of lathe; Therefore, how to break through this technical bottleneck as early as possible, develop the high speed functional, there is independent intellectual property right, heavy duty, precision ball screw, for very crucial lifting numerically-controlled machine manufacture level.And test and manufacture are inseparable, not test, product quality just can not be guaranteed.At present, although there is the performance detector of a lot of ball-screw, mainly carry out when zero load or underloading.Application number is a kind of device detecting comprehensive performance of high-speed precision ball screw pair of invention of 201010624332.9, can measure the multiple parameter of ball-screw, but the device do not made a service test under axial stress state.Shandong SBP Co., Ltd's application number be 200620161148.4 patent of invention " Test Instrument for Comprehensive Performance of High Speed Precision Ball Screw Units " On-line sampling system of ball-screw acceleration in the loaded state, speed, positioning precision and leading screw thermal deformation can be completed, but the performance parameter that its detects is comprehensive not enough; At present, charger adopts maximum is the hydraulic loading device of cost intensive, control mode complexity.
Summary of the invention
For overcoming shortcoming of the prior art, the object of the invention is to provide a kind of device detecting combination property under ball screw assembly, stress state, and it can realize the detection to comprehensive performance of high-speed precision ball screw pair.
For achieving the above object, the technical solution used in the present invention is:
The present invention includes testing table fuselage, described testing table fuselage is fixed on cast iron platform, one end of testing table fuselage is provided with the servomotor providing power source, the output shaft of servomotor is connected with ball screw assembly, one end with the second shaft coupling through the first shaft coupling, dynamic torque sensor, the rotary encoder that the other end of testing table fuselage is provided with current vortex sensor and is connected with ball screw assembly, testing table fuselage is provided with grating scale and detects the infrared temperature sensor of ball screw assembly, screw mandrel temperature in a non contact fashion;
Described testing table fuselage is provided with the rolling guide being positioned at ball screw assembly, both sides, rolling guide is arranged analog operation platform, analog operation platform connects rolling guide by rolling guide slide block, and analog operation platform is connected with charger, and analog operation platform is provided with microphone;
Described ball screw assembly, one end is arranged on stiff end support by angular contact ball bearing, and the other end is arranged on bracket at tail part by rolling ball bearing or angular contact ball bearing; Rolling ball screw pair screw nut is arranged on analog operation platform by nut bearing, the nut of ball screw assembly, is provided with the platinum resistance temperature sensor detecting rolling ball screw pair screw nut temperature in the running with the way of contact.
Described charger comprises charger base and rope, and charger base is horizontally disposed with fixed mount, and fixed mount is fixedly connected with cast iron platform, and charger base vertically arranges charger pillar, and the top of charger pillar arranges head sheave; Charger base is also provided with lower end pulleys, the iron block guide upright post paralleled with charger pillar and vertical columns, iron block guide upright post and vertical columns are set with iron block, and iron block slides up and down along iron block guide upright post; Rope one end is fixed in mounting hole that vertical columns is offered, and the other end first walks around lower end pulleys again through upper head sheave, is connected on the lifting bolt on analog operation platform.
The bottom cylindrical tangent line of described lower end pulleys overlaps with the axial line of lifting bolt.
The stroke of described iron block is greater than the effective travel of ball screw assembly; The heavy 20kg of iron block, quantity is ten pieces.
Described rolling guide two ends are provided with the yielding rubber in case of emergency shielded.
Described cast iron platform offers T-slot, and testing table fuselage is fixed by bolts on cast iron platform by T-slot, and arranges machine tool regulating parallels between testing table fuselage and cast iron platform.
On described testing table fuselage in the restriction position, two ends that analog operation platform runs, the first travel switch and the second travel switch are installed respectively.
Described testing table fuselage is also provided with the origin switch of the original bench mark point as each test.
Relative to prior art, the present invention has following beneficial effect: the present invention by arranging dynamic torque sensor on testing table fuselage, realize the detection to screw mandrel input torque, the number of revolutions that the rotary encoder be connected with ball screw assembly, detects screw mandrel is in real time set, during servomotor built-in encoder capable of reducing using, the intermediate transfer link error of the parts such as shaft coupling; By arranging current vortex sensor just to screw mandrel end, ball screw axial deformation can be detected in real time; The grating scale arranged accurately can detect the physical location of analog operation platform motion; Infrared temperature sensor is for detecting the screw mandrel temperature of ball screw assembly; Stable performance of the present invention, motion and test response speed are fast, test performance parameter comprehensively, accurately, apparatus structure is simple, needed for ball screw assembly, test item, the installation of sensor and detection provide good condition, the inspect on colligated-function of ball screw assembly, under zero load and stress state of different model can be realized, the project checked is comprehensive, and sensing range is wide.
Further, charger of the present invention comprises charger base and rope, and charger base is horizontally disposed with fixed mount, and fixed mount is fixedly connected with cast iron platform, charger base vertically arranges charger pillar, and the top of charger pillar arranges head sheave; Charger base is also provided with lower end pulleys, the iron block guide upright post paralleled with charger pillar and vertical columns, iron block guide upright post and vertical columns are set with iron block, and iron block slides up and down along iron block guide upright post; Rope one end is fixed in mounting hole that vertical columns is offered, the other end first walks around lower end pulleys again through upper head sheave, be connected on the lifting bolt on analog operation platform, the loading to ball screw assembly, can be realized, this charger is simple and reliable for structure, cost is low, and control mode is simple, overcomes the problem that hydraulic loading device that in prior art, control system is complicated, use cost is expensive carries out loading.
Accompanying drawing explanation
Fig. 1 is structural perspective of the present invention;
Fig. 2 be in Fig. 1 along A ?the sectional view of A line;
Fig. 3 is testing table stereographic map;
Fig. 4 is charger stereographic map;
Wherein, 1-servomotor, 2-first shaft coupling, 3-dynamic torque sensor, 4-second shaft coupling, 5-set nut, 6-yielding rubber, 7-stiff end support, 8-ball screw assembly, 9-analog operation platform, 10-lifting bolt, 11-rolling guide, trapezoid block fixed by 12-rolling guide, 13 bracket at tail part, 14-rotary encoder, 15-current vortex sensor, 16-current vortex sensor support, 17-rotary encoder support, 18-travel switch bracket, 19-first travel switch, 20-rolling guide slide block, 21-microphone arm, 22-microphone, 23-origin switch, 24-second travel switch, 25-dynamic torque sensor support, 26-servomotor support, 27-testing table fuselage, 28-fixed mount, 29-lower end pulleys column, 30-lower end pulleys support, 31-lower end pulleys, the upper head sheave of 32-, the upper end pulley support of 33-, 34-iron block guide upright post, 35-charger column, 36-iron block vertical columns, 37-iron block, 38-charger base, 39-machine tool regulating parallels, 40-cast iron platform.
Specific implementation method
Below in conjunction with accompanying drawing, the present invention is described in further details.
See figure 1 ?shown in 2, the present invention includes cast iron platform 40 and the testing table fuselage 27 that two kinds of different in width guide rails can be installed, cast iron platform 40 offers T-slot, testing table fuselage 27 is fixed by bolts on cast iron platform 40 by T-slot, and arranges machine tool regulating parallels 39 between testing table fuselage 27 and cast iron platform 40.By the levelness of level meter and machine tool regulating parallels 39 Adjustment Tests platform entirety.
See Fig. 3, one end of testing table fuselage 27 is provided with the servomotor 1 providing power source, and the output shaft of servomotor 1 is connected with ball screw assembly, 8 one end with the second shaft coupling 4 through the first shaft coupling 2, dynamic torque sensor 3; The other end of testing table fuselage 27 is provided with the current vortex sensor 15 and rotary encoder 14 that are arranged on current vortex sensor support 16, and rotary encoder 14 is arranged on rotary encoder support 17, and rotary encoder 14 is connected with ball screw assembly, 8; Testing table fuselage 27 is evenly provided with the infrared temperature sensor that 3 are detected the screw mandrel temperature of ball screw assembly, 8 in a non contact fashion; Wherein, servomotor 1 is fixed on servomotor support 26, and dynamic torque sensor 3 is fixed on dynamic torque sensor support 25, and the first shaft coupling 2 and the second shaft coupling 4 are rigidity shaft coupling; The two ends of the screw mandrel of ball screw assembly, 8 are fixed with set nut 5.
Ball screw assembly, 8 one end is arranged on stiff end support 7 by angular contact ball bearing, the other end is arranged on bracket at tail part 13 by rolling ball bearing or angular contact ball bearing, ball screw assembly, 8 two ends are fixed, or one end support is fixed in one end, can realize two kinds of the most frequently used supporting way of ball screw assembly, 8; The nut of ball screw assembly, 8 is arranged on analog operation platform 9 by nut bearing, analog operation platform 9 connects rolling guide 11 by rolling guide slide block 20, and tangential movement is done on rolling guide 11, trapezoid block 12 fixed by the rolling guide that testing table fuselage 27 arranges fixing rolling guide 11; Testing table fuselage 27 is provided with the rolling guide 11 of the both sides being positioned at ball screw assembly, 8, rolling guide 11 two ends are provided with the yielding rubber 6 in case of emergency shielded.On testing table fuselage 27 in the restriction position, two ends that analog operation platform 9 runs, install on two travel switch brackets, 18, travel switch bracket and install the first travel switch 19, another travel switch bracket installs the second travel switch 24; Side testing table fuselage 27 being positioned at the first row journey switch 19 arranges origin switch 23, and origin switch 23 has the original bench mark point as each test.Analog operation platform 9 is fixed with microphone arm 21, microphone arm 21 is provided with microphone 22, testing table fuselage 27 is fixed with grating scale.
The nut of ball screw assembly, 8 is provided with platinum resistance temperature sensor, and platinum resistance temperature sensor detects nut temperature when running up of ball screw assembly, 8 with the way of contact.
See Fig. 4, analog operation platform 9 is connected with charger, described charger comprises charger base 38 and wire rope, charger base 38 is horizontally disposed with fixed mount 28, fixed mount 28 is fixedly connected with cast iron platform 40, and charger base 38 vertically arranges charger pillar 35, and the top of charger pillar 35 is welded with iron block, on iron block, fixing upper end pulley support 33, upper end pulley support 33 arranges head sheave 32; Charger base 38 is also provided with lower end pulleys column 29, the iron block guide upright post 34 paralleled with charger pillar 35 and vertical columns 36; Wherein, the top of lower end pulleys column 29 is fixed with lower end pulleys support 30, lower end pulleys support 30 is arranged lower end pulleys 31, and the stroke that moves up and down of iron block 37 is greater than the effective travel of ball screw assembly, 8; Iron block guide upright post 34 and vertical columns 36 are set with iron block 37, and iron block 37 slides up and down along iron block guide upright post 34; Wire rope one end is fixed in mounting hole that vertical columns 36 is offered, and the other end first walks around lower end pulleys 31 again through upper head sheave 32, is connected on the lifting bolt 10 on analog operation platform 9.The heavy 20kg of every block iron block, iron block quantity is ten pieces, and the maximum axis simulating 2000N loads resistance, by being arranged on the quantity of the iron block vertical columns 36 changeable iron block 37 of iron block 37 center pit.The bottom cylindrical tangent line of lower end pulleys 31 overlaps with the axial line of lifting bolt 10; Charger can provide axial force, the cutting resistance of simulation ball screw assembly, 8 under actual condition.
Infrared temperature sensor and platinum resistance temperature sensor are as sensing element, and infrared temperature sensor detects high-speed precision ball screw pair 8 screw mandrel temperature in a non-contact manner, and platinum resistance temperature sensor detects the temperature of nut when running up with the way of contact; To be fixed on current vortex sensor 15 on current vortex sensor support 16 for sensing element, detect the axial deflection of ball screw assembly, 8 when running up; With the screw mandrel end of servomotor 1 built-in encoder and ball screw assembly, 8 and screw mandrel rotary encoder 14 for sensing element, the torsional deflection of record screw mandrel in the process of running up; Take grating scale as sensing element, when ball screw assembly, 8 runs up, its signal is carried out once and second differential, obtain speed and the acceleration of analog operation platform 9 rectilinear motion; With dynamic torque sensor 3 for sensing element, ignore rail friction resistance, obtain the output torque that servomotor 1 drives ball screw assembly, 8 uniform rotation when ball screw assembly, 8 runs up, in order to detect the moment of friction of ball screw assembly, 8; To be fixed on microphone 22 on microphone arm 21 for sensing element, detect the noise figure of screw mandrel when running up; Take acceleration transducer as sensing element, detect its vibration characteristics when ball screw assembly, 8 runs up; With rotary encoder 14 and grating scale for sensing element, detect its positioning precision and backlass when ball screw assembly, 8 runs up; Complete the inspect on colligated-function of ball screw assembly, under the state of running up.
The course of work of the present invention: load ball screw assembly, is opened servomotor and drives ball screw assembly, to rotate, and then drive the tangential movement of analog operation platform, by each sensor, ball screw assembly, is carried out to the mensuration of comprehensive performance parameter.
Being determined as follows of the inspect on colligated-function parameter of ball screw assembly, under the state of running up:
1) positioning precision test
The measurement of ball screw assembly, 8 positioning precision adopt angular encoder and grating scale with the use of synchronous shift mensuration, length direction uses long grating to measure, circumferencial direction adopts angular encoder to measure, grating scale record actual motion position, rotary encoder 14 record object position, adopt IK220 high-speed counting card to carry out real-time counting to this two pulse signals, realize the measurement to ball screw assembly, 8 position deviation.Then, with reference to GB/T17421.2 ?2000 " positioning precision of numerical control axes and repetitive positioning accuracy " evaluation method to positioning precision, realize the test to positioning precision; The rotary encoder 14 that scrambler selects screw mandrel right end to install, does not use the scrambler of servomotor 1 itself, doing so avoids the factors such as the motor feels hot of introducing to the impact of measurement accuracy.
2) backlass test
A kind of method of testing be angular encoder 14 with grating scale with the use of, by IK220 capture card, two-way digital pulse signal is compared.When screw mandrel runs to the reversion of left and right rows way limit, worktable due to the backlash gap of screw mandrel can not travelling backwards immediately, so grating scale can not produce displacement pulse signals, angle of eccentricity in this time period measured by angular encoder 14 is the initial backlash of screw mandrel, and the product of this value and helical pitch is then backlass.
Another kind of method of testing, worktable initial position is A point, first rotation ball lead screw pair 8, and range ability a, eliminates the gap width on this direction, and worktable now runs to B1 point, and the physical location reading grating scale is now X1; Again worktable is pressed same direction displacement b, now movable workbench is to C point; After this again by ball screw assembly, 8 counter motion, move distance b again, because now ball screw assembly, 8 also exists backlass, so the idle running of certain angle can be produced, now worktable runs to B2 point, read grating scale actual position value X2 now, then the difference of reading X1 and X2 be exactly ball screw assembly, 8 along this direction the backlass value at C point place.
3) temperature test
Infrared temperature sensor is adopted to carry out real time temperature test to screw mandrel, under screw mandrel is in rotary state, so adopt non-contact measurement; Utilize SMD platinum resistance temperature sensor to carry out contact test to nut, realize the temperature detection to high-speed ball screw pair 8.
4) noise testing
The test difficult point of ball screw assembly, 8 noise is to there is a large amount of undesired signals in voice signal, comprise sensor noise floor, the noise of guide rail operation and the electromagnetic interference (EMI) etc. of surrounding electrical equipment, so the position that microphone 22 is placed on close to noise source is conducive to accurate test, aim at noise source place during nut and the lead screw pair operation of ball screw assembly, 8.
5) vibration-testing
The present invention selects ICP type three axle piezoelectric acceleration sensor, and traditional piezoelectric acceleration sensor and charge amplifier are integrated in one by it, directly can be connected with collecting device with record, display, simplify test macro, improve measuring accuracy and reliability.Utilize the subsidiary magnetic mount pad of ICP type three axle piezoelectric acceleration sensor to be adsorbed on supporting plate, the vibration on X/Y/Z tri-directions can be tested simultaneously.
6) friction torque test
The present invention can test moment of torsion when rotating, engaged with electric machine main shaft and screw mandrel by shaft coupling by adopting dynamic torque sensor 3, the moment of torsion caused because of friction force between screw mandrel and nut is passed to strain transducer axle, it is made to produce micro-deformation, produce linear voltage signal, import signal into host computer in real time, carry out treatment and analysis.Now tested out moment of friction is approximate value, have ignored rail friction resistance.
7) axial deformation test
Eddy current displacement sensor is arranged on testing table tail cone, aim at screw mandrel tail end end face, initial separation is more than or equal to 0.1mm, realizes the test of screw axis to thermal elongation, detects by current vortex sensor 15 thermal elongation that the parts fastening with screw mandrel carry out indirectly testing screw mandrel.
8) torsional deflection test
Test philosophy: the rotary encoder 14 difference collecting test data simultaneously utilizing motor encoder and ball screw afterbody to install, at one time in section, the difference of both calculating, then just obtains the windup-degree of ball screw assembly, 8, i.e. torsional deflection by calculating conversion.
9) movement velocity and acceleration test
Method of testing is the displacement data adopting grating scale test, carries out once calculating with second differential, obtain actuating speed and acceleration by the test signal exported grating scale to the time.
The present invention can to high-speed precision ball screw pair inspect on colligated-function after running-in under axial stress state, there is provided power by servomotor, the installation of grating scale and rotary encoder and the layout of each sensor element can carry out integration test to the positioning precision of ball screw assembly, backlass, temperature, axial deformation, torsional deflection, moment of friction, vibration, noise, speed and acceleration.Detected parameters of the present invention is wide, and charger adopts simple and effective physical construction, reduces and controls and maintenance cost, can promote the use of.
Claims (6)
1. one kind is detected the device of combination property under ball screw assembly, stress state, it is characterized in that, comprise testing table fuselage (27), described testing table fuselage (27) is fixed on cast iron platform (40), one end of testing table fuselage (27) is provided with the servomotor (1) providing power source, the output shaft of servomotor (1) is through the first shaft coupling (2), dynamic torque sensor (3) is connected with ball screw assembly, (8) one end with the second shaft coupling (4), the rotary encoder (14) that the other end of testing table fuselage (27) is provided with current vortex sensor (15) and is connected with ball screw assembly, (8), testing table fuselage (27) is provided with grating scale and detects the infrared temperature sensor of ball screw assembly, (8) screw mandrel temperature in a non contact fashion,
Described testing table fuselage (27) is provided with the rolling guide (11) being positioned at ball screw assembly, (8) both sides, rolling guide (11) is arranged analog operation platform (9), analog operation platform (9) connects rolling guide (11) by rolling guide slide block (20), analog operation platform (9) is connected with charger, analog operation platform (9) is provided with microphone (22);
Described ball screw assembly, (8) one end is arranged on stiff end support (7) by angular contact ball bearing, and the other end is arranged on bracket at tail part (13) by rolling ball bearing or angular contact ball bearing; Ball screw assembly, (8) nut is arranged on analog operation platform (9) by nut bearing, the nut of ball screw assembly, (8) is provided with the platinum resistance temperature sensor detecting rolling ball screw pair screw nut temperature in the running with the way of contact;
(40) offer T-slot to described cast iron platform, testing table fuselage (27) is fixed by bolts on cast iron platform (40) by T-slot, and arranges machine tool regulating parallels (39) between testing table fuselage (27) and cast iron platform (40);
Described charger comprises charger base (38) and rope, charger base (38) is horizontally disposed with fixed mount (28), fixed mount (28) is fixedly connected with cast iron platform (40), charger base (38) is vertically arranged charger pillar (35), the top of charger pillar (35) arranges head sheave (32); Charger base (38) is also provided with lower end pulleys (31), the iron block guide upright post (34) paralleled with charger pillar (35) and vertical columns (36), iron block guide upright post (34) and vertical columns (36) are set with iron block (37), and iron block (37) slides up and down along iron block guide upright post (34); Rope one end is fixed in mounting hole that vertical columns (36) is offered, the other end first walks around lower end pulleys (31) again through upper head sheave (32), is connected on the lifting bolt (10) on analog operation platform (9).
2. a kind of device detecting combination property under ball screw assembly, stress state according to claim 1, it is characterized in that, the bottom cylindrical tangent line of described lower end pulleys (31) overlaps with the axial line of lifting bolt (10).
3. a kind of device detecting combination property under ball screw assembly, stress state according to claim 1, it is characterized in that, the stroke of described iron block (37) is greater than the effective travel of ball screw assembly, (8).
4. a kind of device detecting combination property under ball screw assembly, stress state according to claim 1, it is characterized in that, described rolling guide (11) two ends are provided with the yielding rubber (6) in case of emergency shielded.
5. a kind of device detecting combination property under ball screw assembly, stress state according to claim 1, it is characterized in that, on described testing table fuselage (27) in the restriction position, two ends that analog operation platform (9) runs, the first travel switch (19) and the second travel switch (24) are installed respectively.
6. a kind of device detecting combination property under ball screw assembly, stress state according to claim 1, it is characterized in that, described testing table fuselage (27) is also provided with the origin switch (23) of the original bench mark point as each test.
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| CN201310303743.1A CN103389205B (en) | 2013-07-17 | 2013-07-17 | A kind of device detecting combination property under ball screw assembly, stress state |
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