CN102095541B - Experiment table for studying friction mechanism of precision ball screw pair - Google Patents
Experiment table for studying friction mechanism of precision ball screw pair Download PDFInfo
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- CN102095541B CN102095541B CN2010105737622A CN201010573762A CN102095541B CN 102095541 B CN102095541 B CN 102095541B CN 2010105737622 A CN2010105737622 A CN 2010105737622A CN 201010573762 A CN201010573762 A CN 201010573762A CN 102095541 B CN102095541 B CN 102095541B
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Abstract
An experiment table for studying the friction mechanism of a precision ball screw pair comprises a ball screw pair, and a torque sensor connected with the screw for acquiring the friction torque of the ball screw pair, wherein the ball screw pair includes a flange-type nut, a screw support and an axial sliding support respectively arranged on both ends of the screw, one end of an axial force sensor is connected with one end of the screw on the same side of the axial sliding support; the other end of the axial force sensor is connected with the piston rod of an oil cylinder; an angular contact bearing is sheathed on the flange-type nut; a connection block is arranged on the outer side of the angular contact bearing; an axial sliding support is connected with the connection block; a motor is placed on the axial sliding support; the power output of the motor is transmitted to the flange-type nut through a belt drive device; and the flange-type nut, the inner ring of the angular contact bearing and the driven wheel of the belt drive device are fixedly connected with one another.
Description
Technical field
The present invention relates to a kind of friction mechanism research experiment platform of precise ball screw pair.
Background technology
The moment of friction of ball-screw is meant the various friction factors moment of resistance that motion constitutes to ball-screw, and it has reflected the system responses of ball-screw friction, is the important performance characteristic of ball-screw.Along with the ball-screw performance constantly improves, moment of friction becomes the major obstacle of its high precision, high-speed development.The excessive transmission efficiency that reduced of moment of friction; Its extremely jiggly performance has influenced the bearing accuracy of ball-screw, and it directly causes energy loss and temperature rise, and undue temperature rise produces thermal deformation influences bearing accuracy; And aggravation is worn and torn, the reduction lubricant effect, has shortened the serviceable life of ball-screw.
The used sensor of the proving installation of ball screw assembly, moment of friction of the prior art all is a force transducer; The patent No. be No. 201010115927.1 Chinese invention patent and the patent No. be 200620161149.9 utility model patent disclosed just all be the contacted cantilever in test side that on nut, is provided with force cell; Utilize force cell to collect the respective signal of the moment of friction of ball screw assembly, to be tested; This method of testing is under the not high situation of physical construction precision; Can when factored moment, introduce error, the more important thing is that these testing apparatuss can't apply axial load, can only measure the dynamic pre-fastening moment under the no-load condition by the arm of force; Can't measure the moment of friction of ball screw assembly, under loading; Its measurement data and actual condition differ greatly, and can not be used for the research of ball screw assembly, friction mechanism, can not ask the method that reduces the ball-screw frictional dissipation to offer help to record.
Simultaneously, the patent No. is 201010101178.7 and 201010039688.6 the axial loading structure of the disclosed ball screw assembly, of Chinese invention patent, but its design feature has determined to install and measure the device of moment of friction.Therefore, also not occurring at present one is used for ball screw assembly, and promptly can on nut, applies the research experiment platform that moment of friction can be accurately measured in axial loading again.
Summary of the invention
The present invention be directed to and have the problem that ball screw assembly, friction torque test technology exists now, provide a kind of measuring accuracy height to can be used for ball screw assembly, friction mechanism research experiment platform under high speed, the high year operating mode.
The present invention adopts following technical scheme:
A kind of precise ball screw pair friction mechanism research experiment platform; Comprise: ball screw assembly; On leading screw, be connected with the torque sensor of the moment of friction that is used to obtain ball screw assembly; Said ball screw assembly, comprises the flange-type nut, is respectively equipped with at the leading screw two ends that leading screw supports and supports that endwisely slip, and on leading screw and the end support homonymy that endwisely slips, is connected with axial force transducer and is connected with an end of axial force transducer; On the other end of axial force transducer, be connected with oil hydraulic cylinder and be connected with the piston rod of oil hydraulic cylinder; On the flange-type nut, be arranged with angular contact bearing, be provided with contiguous block, on contiguous block, be connected with support in axial sliding in the outside of angular contact bearing; Be provided with motor on the support in axial sliding, the power output warp band transmission of motor passes to the flange-type nut and described flange-type nut, the inner ring of angular contact bearing and the engaged wheel in the band transmission are mutually permanently connected.
Remove in addition, the present invention also has the following advantages:
When (1) driving as the master with leading screw, nut is an output source, and the friction force of ball screw assembly, makes nut rotate; Want to record this power, need design constraint nut rotatablely moves and obtains the big or small device of this constraining force, as will on nut, applying axial load; Then can duplicate restricted problem to rotatablely moving with friction measurement device, the power that makes measure this moment is not only the friction force of ball screw assembly,, also comprises distance rod torsional deformation stress; Relation between the two is non-linear; Can't solve the size of friction force separately, the high more distance rod torsional deformation of speed is serious more, therefore; Middle low speed can not accurately measure the size of ball-screw friction force down, and the data measured error is bigger down at a high speed.
As directly on nut, do not apply axial load, and give nut through being provided with on the nut with the contacted cantilever indirect transfer of force transducer load, along with the increase of axial load; Transmit between the surface of contact of axial load and can produce juxtaposition metamorphose, cause that friction force increases between this surface of contact, cantilever moved up and down the generation resistance; Therefore, the power of measurement is not only the friction force of ball screw assembly,, has also comprised to transmit the friction force between the axial load surface of contact; Therefore; In can not accurately measure the size of ball-screw friction force under the low load, highly carry that the data measured error is bigger down, measure so can only be used for the moment of friction of the lower Miniature ball lead screw pair of load.
Prior art all drives with leading screw and makes nut make rotation and rectilinear motion, and design axially loads and the friction measurement structure in any case, all is difficult to accurately measure the size of ball-screw friction force, more can not be used for high at a high speed research of carrying friction force under the situation.In view of the above; The present invention has done thorough improvement to the structure of ball screw assembly, friction torque test experiment table, has designed a kind of ball screw assembly, friction torque test experiment table with unique texture, and this experiment table inputs to the driving force of servomotor through synchronous pulley the nut of ball screw assembly; Make nut become power source; Nut passes to leading screw through ball with friction force, and the rotation to leading screw retrains and measures so, can obtain the ball-screw friction force.
When driving as the master, can apply axial load, the tightness degree that the control ball contacts with raceway and the size of normal load at the axis direction of leading screw with nut; When with the leading screw being main the driving, it is identical on the nut that moves, to load effect, does not repeat constraint and can not produce rotatablely moving of leading screw; Because only rotatablely moving of leading screw can be equipped with the friction measurement device constraint by leading screw one end, is connected through the shaft coupling that can rotate freely between the piston rod of the other end and oil hydraulic cylinder, promptly the degree of freedom of this end wrapping wire thick stick axle center rotation is also last restrained; The mode of this direct loading need not other power and passes the structure structure; Avoided the stress of the so torsional deformation of auxiliary force transferring structure of distance rod own, be contained in the measurement numerical value of ball-screw friction force, therefore; No matter the rotating speed height, the ball-screw friction force of measurement is all very accurate.
When driving as the master with nut, leading screw is as output source, and the mode of obtaining the ball-screw friction force is rotatablely moving of constraint leading screw; Because nut rotation adds the straight line action, makes leading screw not have axially movable degree of freedom, the moment of friction sensor does not have yet and moves axially like this; When not only being main the driving, need not to be provided with moment of friction sensor and the synchronizing linkage of ball screw assembly, nut to be measured, the more important thing is with identical axial velocity motion with the leading screw; Be installed in the also relative fixed of cantilever on the moment of friction sensor, and the adapter sleeve that only is connected on the leading screw can move freely before and after the effect with load, like Fig. 4 and shown in Figure 5; Guaranteed to have only circumferential the contact between the cantilever with the moment of friction sensor, do not had unnecessary contact, avoided heavily loaded unnecessary surface of contact friction force down; Be contained in the measurement numerical value of ball-screw friction force; Therefore, no matter magnitude of load, the ball-screw friction force of measurement is all very accurate.
(2) lubricating status of ball screw assembly, has material impact to the frictional behaviour between ball and raceway, and temperature directly influences its lubricating status, and wanting to study the ball screw assembly, friction mechanism will control temperature to some extent.With nut during as active drive; Greatly reduced moment of inertia, made the heat of the less generation of selected power of motor less, avoided transmitting thermal source through the mode of belt transferring power and given ball screw assembly, with heat exchange pattern; Only can give the thermal source of ball screw assembly, also very little through radiant heat transfer; Avoid the problem of ball screw assembly, thermal deformation, reduced the ball screw assembly, lubricating status and received Influence of Temperature, got rid of the high at a high speed influence that following ball-screw subsystem receives external heat source of carrying.
Effective effect of the present invention is: experiment table can realize that the ball screw assembly, moment of friction accurately measures; Make data measured meet the situation under the actual condition more; It is fixed that simple to operate, operation moves; Can be used for the research of ball screw assembly, rubbing wear mechanism, also help to record the method that reduces the ball-screw frictional dissipation and raise the efficiency of asking.
Description of drawings
Fig. 1 is the structural representation of the friction mechanism research experiment platform of precise ball screw pair under the axial visual angle; Fig. 2 is the structural representation of friction mechanism research experiment platform of the precise ball screw pair of hiding sliding support under the axial visual angle; Fig. 3 is the diagrammatic cross-section that driven pulley is connected with flange-type nut and angular contact bearing inner ring, and Fig. 4 and Fig. 5 are respectively the front view and the left view of adapter sleeve and moment of friction sensor assembling synoptic diagram.The concrete structure of precise ball screw pair friction torque test experiment table is:
1 oil hydraulic cylinder; The L type of 2 oil hydraulic cylinders supports; The piston rod of 3 oil hydraulic cylinders; 4 axial force transducers; 5 sliding supports; 6 support rails; The leading screw of 7 ball screw assembly,s; 8 flange-type nuts; 9 sliding supports; 10 support guides; The L type of 11 servomotors supports; 12 servomotors; 13 contiguous blocks; 14 angular contact bearings; 15 driven pulleys; 16 synchronous cog belts; 17 driving pulleys; 18 adapter sleeves; 19 leading screws support; 20 moment of friction sensors.
Embodiment
With reference to Fig. 1; Precise ball screw pair friction mechanism research experiment platform of the present invention comprises leading screw 7; Adapter sleeve 18 is housed on leading screw 7 to be connected with the moment of friction sensor 20 that obtains ball screw assembly; When nut drives; Leading screw is executed when changeing, and moment of friction sensor 20 directly obtains the moment of friction of ball screw assembly, through its cantilever rotatablely moving of leading screw of constraint, be respectively equipped with leading screw support 19 at the leading screw two ends and support 5 with endwisely slipping; Leading screw with the ends that support 5 homonymies that endwisely slip on be connected with axial force transducer 4 and be connected with an end of axial force transducer 4, on the other end of axial force transducer 4, be connected with oil hydraulic cylinder 1 and be connected with the piston rod of oil hydraulic cylinder 1.
With reference to Fig. 2; On flange-type nut 8, be arranged with angular contact bearing 14; Be provided with contiguous block 13 in the outside of angular contact bearing 14, on contiguous block 13, be connected with support 9 in axial sliding, be provided with motor 12 on the support 9 in axial sliding; The power output warp band transmission of motor 12 passes to flange-type nut 8 and described flange-type nut 8, the inner ring of angular contact bearing 14 and the engaged wheel 15 in the band transmission are mutually permanently connected, with reference to Fig. 3.In the present embodiment, endwisely slip and support 5 and can realize, that is: endwisely slip and support 5 and form by support rails 6 and along the supporting of support rails slippage by following concrete technical measures; Support 9 can realize that is: support 9 is formed by support guide 10 and along the rack body of support guide slippage in axial sliding by following concrete technical measures in axial sliding.
Claims (3)
1. precise ball screw pair friction mechanism research experiment platform; Comprise: ball screw assembly; On leading screw (7), be connected with the torque sensor (20) of the moment of friction that is used to obtain ball screw assembly; It is characterized in that; Said ball screw assembly, comprises flange-type nut (8), is respectively equipped with leading screw at the leading screw two ends and supports (19) and the support (5) that endwisely slips, and leading screw is connected with axial force transducer (4) on an end of itself and support (5) homonymy that endwisely slips; The other end of axial force transducer (4) is connected with the piston rod of oil hydraulic cylinder (1); On flange-type nut (8), be arranged with angular contact bearing (14), be provided with contiguous block (13), on contiguous block (13), be connected with support (9) in axial sliding in the outside of angular contact bearing (14); Be provided with motor (12) on the support (9) in axial sliding, the power output warp band transmission of motor (12) passes to flange-type nut (8) and described flange-type nut (8), the inner ring of angular contact bearing (14) and the engaged wheel (15) in the band transmission are mutually permanently connected.
2. precise ball screw pair friction mechanism research experiment platform according to claim 1 is characterized in that, the support (5) that endwisely slips is formed by support rails (6) and along the supporting of support rails slippage.
3. precise ball screw pair friction mechanism research experiment platform according to claim 1 is characterized in that support (9) is formed by support guide (10) and along the rack body of support guide slippage in axial sliding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105737622A CN102095541B (en) | 2010-12-06 | 2010-12-06 | Experiment table for studying friction mechanism of precision ball screw pair |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105737622A CN102095541B (en) | 2010-12-06 | 2010-12-06 | Experiment table for studying friction mechanism of precision ball screw pair |
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| Publication Number | Publication Date |
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| CN102095541A CN102095541A (en) | 2011-06-15 |
| CN102095541B true CN102095541B (en) | 2012-06-27 |
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| CN2010105737622A Expired - Fee Related CN102095541B (en) | 2010-12-06 | 2010-12-06 | Experiment table for studying friction mechanism of precision ball screw pair |
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| CN110542505B (en) * | 2019-09-29 | 2021-09-14 | 山东大学 | Device and method for measuring friction moment of ball screw pair and application |
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| CN111678694B (en) * | 2020-08-11 | 2021-07-20 | 菲尼克斯(南京)智能制造技术工程有限公司 | Ball screw friction resistance detecting system |
| CN114152382A (en) * | 2021-12-03 | 2022-03-08 | 山东建筑大学 | Device and method for measuring friction moment of ball screw roller pair based on axial loading |
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|---|---|---|---|---|
| GB562598A (en) * | 1942-12-31 | 1944-07-07 | Siemens Brothers & Co Ltd | Improvements relating to electrical recording apparatus |
| CN2092751U (en) * | 1991-05-24 | 1992-01-08 | 华东工学院 | Dynamic friction torque measuring device for ball bearing guide screw |
| CN101660957A (en) * | 2009-09-22 | 2010-03-03 | 南京理工大学 | Rolling linear guide friction force dynamic detection device and detection method thereof |
| CN201885839U (en) * | 2010-12-06 | 2011-06-29 | 东南大学 | Precise ball-screw pair friction mechanism research experiment table |
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2010
- 2010-12-06 CN CN2010105737622A patent/CN102095541B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB562598A (en) * | 1942-12-31 | 1944-07-07 | Siemens Brothers & Co Ltd | Improvements relating to electrical recording apparatus |
| CN2092751U (en) * | 1991-05-24 | 1992-01-08 | 华东工学院 | Dynamic friction torque measuring device for ball bearing guide screw |
| CN101660957A (en) * | 2009-09-22 | 2010-03-03 | 南京理工大学 | Rolling linear guide friction force dynamic detection device and detection method thereof |
| CN201885839U (en) * | 2010-12-06 | 2011-06-29 | 东南大学 | Precise ball-screw pair friction mechanism research experiment table |
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| CN102095541A (en) | 2011-06-15 |
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