CN204512339U - The automatic pre-tightening apparatus of a kind of double nut ball screw pair - Google Patents
The automatic pre-tightening apparatus of a kind of double nut ball screw pair Download PDFInfo
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- CN204512339U CN204512339U CN201520068804.5U CN201520068804U CN204512339U CN 204512339 U CN204512339 U CN 204512339U CN 201520068804 U CN201520068804 U CN 201520068804U CN 204512339 U CN204512339 U CN 204512339U
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Abstract
The automatic pre-tightening apparatus of a kind of double nut ball screw pair, comprises ultra-magnetic telescopic cylindrical shell, drive coil, initial pretension bolt and force snesor; The leading screw that ultra-magnetic telescopic barrel jacket is contained in double nut ball screw pair is between two nuts, is provided with force snesor between ultra-magnetic telescopic cylindrical shell and a nut, a nut arranges initial pretension bolt; Drive coil is placed in the outside of ultra-magnetic telescopic cylindrical shell by coil carrier, is connected with the stud preventing two feed screw nuts from relatively rotating between two nuts of double nut ball screw pair; Drive coil is connected with the controllable constant-current source in driving power; Driving power comprises microprocessor, D/A converter, controllable constant-current source and AD converter, microprocessor is connected with D/A converter and AD converter respectively, D/A converter is connected with controllable constant-current source, and controllable constant-current source is connected with drive coil, and AD converter is connected with force snesor.This equipment safety is reliable, achieves the automatic pretension of ball screw.
Description
Technical field
The utility model relates to a kind of device for the automatic pretension of double nut ball screw pair, belongs to ball screw pair pretightening force adjustment technology field.
Background technique
Manufacturing industry is not only the carrier of new and high technology, and is the power of hi-tech development.Ball screw pair is as the primary drive device of lathe upper feeding and maneuvering and control, increasingly extensive in the application in machining field.Along with the development of numerical control machine tool, more and more higher requirement is proposed to ball screw pair transmission accuracy.
The mode of ball screw pretension has double nut pretension and single nut pretension two kinds.
Double nut firmly beforehand means has again compression pretension method, and namely by the pre-compressing tablet between two nuts, pre-compressing tablet is thin, is tightly pulled in together by two nuts, reaches pretension; Stretching pretension method, namely contrary with compression, pre-compressing tablet is thick, extrudes two nuts, and separately nut, reaches pretension; Threaded pre-tightening method, the presetting screw namely between turn two nuts, makes nut in opposite directions or the oppositely changing of the relative positions, reaches pretension; Tooth difference pretension method, is namely drilled with several hole, coordinates different holes to reach pretension with pin on a nut and pad; Spring pre-tightening method etc.Single nut firmly beforehand means has again large steel ball pretension method, and namely steel ball is larger than pearl groove, four point cantact, reaches pretension object with this; Helical pitch skew pretension method, the pearl groove namely in nut, with the pearl groove on screw rod, has a reciprocal displacement difference, reaches pretension with this.
Ball screw pair firmly beforehand means affects its transmission accuracy.For the situation of pure transmission, General Requirements ensuring smooth transmission, has allowed certain back gap, multiselect single nut; For the situation of precision drive not allowing back gap, then need to select double nut pretension, it can adjust the size of pretightening force, and retentivity is good, and can repeat adjustment.
Due to the error manufactured and assemble, always there is gap in ball screw pair, ball screw is under the effect of thrust load simultaneously, ball and screw thread raceway contact position can produce resiliently deformable, the size in ball screw and nut gap directly can have influence on the actual precision of processing of numerical control machine tool, for this reason, should manage to be eliminated or reduce as far as possible.In numerical control machine tool assembling, pretightening force is extensively adopted to eliminate the gap of ball-screw-transmission.The pretightening force of ball screw is the major parameter producing leading screw friction torque in ball screw pair, applies pretightening force, can improve axial rigidity and the positioning precision of ball screw pair to nut.In addition, high factor such as acceleration starting and stopping and external loading change, temperature variation etc., requires that ball screw pair pretightening force is also wanted adjust in real time to ensure that ball screw auxiliary driving has higher dynamic performance.
For above-mentioned analysis, for improving precision stability and the reliability of ball screw auxiliary driving, realizing precision drive, multiselect double nut firmly beforehand means, but all can not realize real-time detection and control pretightening force size.
Chinese patent literature CN203656087U disclosed the double nut ball screw pair of accurate adjustment " pretightening force can ", comprise leading screw, mother nut, stud type pressure transducer, tightening cushion, pre-load nut, secondary nut, pressure transducer collecting device, computer, several stud type pressure transducers are circumferentially evenly arranged between mother nut and secondary nut, a left side for each stud type pressure transducer, right-hand member stud passes through tightening cushion, pre-load nut respectively with mother nut on the right of flange and the flange coupling on the secondary nut left side, each stud type pressure transducer connects computer by pressure transducer collecting device.Stud type pressure transducer quantity is 3-6.Although this double nut ball screw pair can realize the accurate adjustment of Double-screw nut ball leading screw secondary pretightening force measuring, automatic adjustment can not be realized.
Summary of the invention
What the utility model existed for existing ball screw pair preload Technique can not accurately reflect and adjust the deficiencies such as the size of pretightening force, provides a kind of reliable efficient, automatic pre-tightening apparatus of double nut ball screw pair that automatically can adjust pretightening force size according to the applied load of ball screw pair.This device can meet high-performance mechanical transmission requirement.
The automatic pre-tightening apparatus of double nut ball screw pair of the present utility model, adopts following technological scheme:
This device, comprises pretensioner and driving power:
Pretensioner, comprises ultra-magnetic telescopic cylindrical shell, drive coil, initial pretension bolt and force snesor; The leading screw that ultra-magnetic telescopic barrel jacket is contained in double nut ball screw pair, between two nuts being in double nut ball screw pair, is provided with force snesor between ultra-magnetic telescopic cylindrical shell and a nut, a nut arranges initial pretension bolt; Drive coil is placed in the outside of ultra-magnetic telescopic cylindrical shell by coil carrier, is connected with the stud preventing two feed screw nuts from relatively rotating between two nuts of double nut ball screw pair; Drive coil is connected with the controllable constant-current source in driving power;
Initial pretension bolt is for regulating the initial pretightening force of double nut ball screw pair, and the size of this pretightening force is limited to 1/3rd of load suffered by leading screw.The arranged outside of drive coil has loop sleeve, to protect drive coil.
Driving power, comprise microprocessor, D/A converter (digital to analog converter), controllable constant-current source and AD converter (analog-digital converter), microprocessor is connected with D/A converter and AD converter respectively, D/A converter is connected with controllable constant-current source, controllable constant-current source is connected with drive coil, and AD converter is connected with force snesor.Microprocessor controls by D/A converter the electric current that controllable constant-current source outputs to drive coil, thus changes the magnetic field size driving ultra-magnetic telescopic cylindrical shell, and then controls the output of pretightening force.By force snesor, the value of the power be applied between two nuts is fed back to microprocessor after AD converter conversion.
Be provided with heat insulation layer between coil carrier and ultra-magnetic telescopic cylindrical shell, coil carrier arranges helical intake, adopt pneumatic cooling means to dispel the heat.The heat reducing drive coil generation with this, on the impact of whole device, improves the precision of ball screw pretension.
After priming task, the size of pretightening force between feed screw nut is measured in real time by force snesor, and by Signal transmissions to microprocessor, if require deviation with the pretightening force set in microprocessor, then microprocessor sends instruction, makes controllable constant-current source regulation output to the size of current of drive coil, and then regulate driving magnetic field size, the change of driving magnetic field makes again the generation of ultra-magnetic telescopic cylindrical shell elongate or shorten, thus compensates pretightening force deviation, realizes the regulation and control of pretightening force.
The utility model adopts the flexible pretightening force increasing or reduce between leading screw and two nuts of ultra-magnetic telescopic cylindrical shell, achieving the target of the automatic pretension of ball screw, providing technical support for improving mechanically operated precision.This equipment safety is reliable, achieves the automation adjustment of ball screw pretension, ensure that ball screw auxiliary driving has higher dynamic performance, improve precision stability and the reliability of ball screw auxiliary driving.
Accompanying drawing explanation
Fig. 1 is the structural representation of the automatic pre-tightening apparatus of the utility model double nut ball screw pair.
Fig. 2 is pretightening force control principle schematic diagram of the present utility model.
In Fig. 1: 1. inner sleeve, 2. ultra-magnetic telescopic cylindrical shell, 3.A nut, 4. force snesor, 5.A end cap, 6. stud, 7. coil carrier, 8. nut, 9. loop sleeve, 10. drive coil, 11. helical intakes, 12. heat insulation layers, 13.B nut, 14.B end cap, 15. outer sleeves, 16. initial pretension bolts, 17, leading screw.
Embodiment
As shown in Figure 1, the automatic pre-tightening apparatus of double nut ball screw pair of the present utility model, for regulating the change of double nut ball screw pair (leading screw 17 being connected with A nut 3 and B nut 13) pretightening force when operation, adopt the flexible automatic regulation and control realizing pretightening force of ultra-magnetic telescopic cylindrical shell.This device mainly comprises pretensioner and driving power.
Pretensioner mainly comprises ultra-magnetic telescopic cylindrical shell 2, drive coil 10 and initial pretension bolt 16.Ultra-magnetic telescopic cylindrical shell 2 in a tubular form, adopts super magnetostriction material to make.Ultra-magnetic telescopic cylindrical shell 2 is arranged between outer sleeve 15 and inner sleeve 1, on the leading screw 17 that inner sleeve 1 is sleeved on double nut ball screw pair and between A nut 3 and B nut 13.Being provided with force snesor 4 between ultra-magnetic telescopic cylindrical shell 2 and a nut (A nut 3 or B nut 13), adopting piezoelectric force transducer, for obtaining the size of pretightening force in time.Ultra-magnetic telescopic cylindrical shell 2 is just provided with like this between A nut 3 and B nut 13.Drive coil 10 is wrapped on coil carrier 7, and coil carrier 7 is arranged between A nut 3 and B nut 13, and is sleeved on outer sleeve 15.A end cap 5 and B end cap 14 is respectively arranged with in the both sides of coil carrier 7, outer sleeve 15 and inner sleeve 1.The arranged outside of drive coil 10 has loop sleeve 9.The driving magnetic field that drive coil 10 produces drives ultra-magnetic telescopic cylindrical shell 2 to elongate or shorten.According to the size of the pretightening force of force snesor 4 Real-time Obtaining, regulate the size of current of drive coil 10, and then the driving magnetic field produced by drive coil 10 drives ultra-magnetic telescopic cylindrical shell 2 to elongate or shorten, and realizes the adjustment of pretightening force.Initial pretension bolt 16 is connected on B nut 13, and for the initial pretightening force between adjusting screw and nut, initial pretightening force generally gets about 1/3rd of load.Being connected with stud 6 between two feed screw nuts (A nut 3 and B nut 13) of double nut ball screw pair, relatively rotating for preventing two feed screw nuts.The two ends of stud 6, without screw thread, by attaching nut 8 on stud 6, prevent stud 6 play.
Due to drive coil 10 galvanization in the course of the work, the Conversion of Energy of the resistance consumption of coil is heat, conductor temperature is raised, and the performance of ultra-magnetic telescopic cylindrical shell 2 can be subject to the impact of heat, and A nut 3, B nut 13 even leading screw itself all can be subject to heat affecting and thermal distortion occur.Therefore, between coil carrier 7 and outer sleeve 15, be provided with heat insulation layer 12, helical intake 11 be set on coil carrier 7 simultaneously, adopt pneumatic cooling means to dispel the heat.The heat reducing drive coil 10 generation with this, on the impact of whole device, improves the precision of ball screw pretension.
As shown in Figure 2, driving power comprises microprocessor, D/A converter (digital to analog converter), controllable constant-current source and AD converter (analog-digital converter), microprocessor, D/A converter are connected successively with controllable constant-current source, controllable constant-current source is connected with drive coil 10, and microprocessor is connected with force snesor 4 by AD converter simultaneously.By the electric current of Microprocessor S3C44B0X drive coil 10, microprocessor controls by D/A converter the electric current that controllable constant-current source outputs to drive coil 10, thus changes the magnetic field size driving ultra-magnetic telescopic cylindrical shell 2, and then controls the output of pretightening force.By force snesor 4, the value of the power be applied between A nut 3 and B nut 13 is fed back to microprocessor after AD converter conversion.Controllable constant-current source is prior art, can adopt existing circuit.
The process that the utility model realizes the automatic regulation and control of pretightening force is as described below:
Due to ball screw pair accelerate starting and stopping, or applied load makes the initial pretightening force size applied by initial pretension bolt 16 between feed screw nut change, and in order to adapt to this change, the size of pretightening force needs adjustment automatically.After priming task, the size of pretightening force between feed screw nut is measured in real time by force snesor 4, and send this force value to microprocessor, this value compares with the setting pretightening force of storage by microprocessor, if require deviation with setting pretightening force, the size of current of drive coil 10 is then regulated by microprocessor, and then regulate the magnetic field size driving ultra-magnetic telescopic cylindrical shell 2, the change of driving magnetic field makes again ultra-magnetic telescopic cylindrical shell 2 generation elongate or shorten, thus pretightening force deviation is compensated, realize the regulation and control of pretightening force.
Claims (5)
1. the automatic pre-tightening apparatus of double nut ball screw pair, comprises pretensioner and driving power, it is characterized in that:
Pretensioner, comprises ultra-magnetic telescopic cylindrical shell, drive coil, initial pretension bolt and force snesor; The leading screw that ultra-magnetic telescopic barrel jacket is contained in double nut ball screw pair, between two nuts being in double nut ball screw pair, is provided with force snesor between ultra-magnetic telescopic cylindrical shell and a nut, a nut arranges initial pretension bolt; Drive coil is placed in the outside of ultra-magnetic telescopic cylindrical shell by coil carrier, is connected with the stud preventing two feed screw nuts from relatively rotating between two nuts of double nut ball screw pair; Drive coil is connected with the controllable constant-current source in driving power;
Driving power, comprise microprocessor, D/A converter, controllable constant-current source and AD converter, microprocessor is connected with D/A converter and AD converter respectively, and D/A converter is connected with controllable constant-current source, controllable constant-current source is connected with drive coil, and AD converter is connected with force snesor.
2. the automatic pre-tightening apparatus of double nut ball screw pair according to claim 1, is characterized in that, described initial pretension bolt is for regulating the initial pretightening force of double nut ball screw pair, and the size of this pretightening force is limited to 1/3rd of load suffered by leading screw.
3. the automatic pre-tightening apparatus of double nut ball screw pair according to claim 1, it is characterized in that, the arranged outside of described drive coil has loop sleeve.
4. the automatic pre-tightening apparatus of double nut ball screw pair according to claim 1, is characterized in that: be provided with heat insulation layer between described coil carrier and ultra-magnetic telescopic cylindrical shell.
5. the automatic pre-tightening apparatus of double nut ball screw pair according to claim 1 or 4, is characterized in that: described coil carrier arranges helical intake.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520068804.5U CN204512339U (en) | 2015-01-30 | 2015-01-30 | The automatic pre-tightening apparatus of a kind of double nut ball screw pair |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520068804.5U CN204512339U (en) | 2015-01-30 | 2015-01-30 | The automatic pre-tightening apparatus of a kind of double nut ball screw pair |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204512339U true CN204512339U (en) | 2015-07-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520068804.5U Expired - Fee Related CN204512339U (en) | 2015-01-30 | 2015-01-30 | The automatic pre-tightening apparatus of a kind of double nut ball screw pair |
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| Country | Link |
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| CN (1) | CN204512339U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106767631A (en) * | 2017-02-14 | 2017-05-31 | 山东建筑大学 | The device and method of real-time detection double nut ball screw assembly, raceway wear-thickness |
| TWI669457B (en) * | 2018-07-20 | 2019-08-21 | 財團法人工業技術研究院 | Ball screw with force sensor in radial direction |
| TWI716263B (en) * | 2020-01-17 | 2021-01-11 | 上銀科技股份有限公司 | Ball screw for immediate measurement and adjustment of preloading |
-
2015
- 2015-01-30 CN CN201520068804.5U patent/CN204512339U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106767631A (en) * | 2017-02-14 | 2017-05-31 | 山东建筑大学 | The device and method of real-time detection double nut ball screw assembly, raceway wear-thickness |
| TWI669457B (en) * | 2018-07-20 | 2019-08-21 | 財團法人工業技術研究院 | Ball screw with force sensor in radial direction |
| US10914368B2 (en) | 2018-07-20 | 2021-02-09 | Industrial Technology Research Institute | Ball screw with force sensor in radial direction |
| TWI716263B (en) * | 2020-01-17 | 2021-01-11 | 上銀科技股份有限公司 | Ball screw for immediate measurement and adjustment of preloading |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150729 Termination date: 20180130 |
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| CF01 | Termination of patent right due to non-payment of annual fee |