CN110346071B - Friction measuring structure for micro test force - Google Patents
Friction measuring structure for micro test force Download PDFInfo
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- CN110346071B CN110346071B CN201910782352.XA CN201910782352A CN110346071B CN 110346071 B CN110346071 B CN 110346071B CN 201910782352 A CN201910782352 A CN 201910782352A CN 110346071 B CN110346071 B CN 110346071B
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- 238000006073 displacement reaction Methods 0.000 claims abstract description 20
- 238000005259 measurement Methods 0.000 description 14
- 230000003321 amplification Effects 0.000 description 5
- 238000003199 nucleic acid amplification method Methods 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/04—Measuring force or stress, in general by measuring elastic deformation of gauges, e.g. of springs
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention discloses a friction force measuring structure for a small test force. The device comprises a supporting seat, a sliding base and a friction force measuring mechanism, wherein the sliding base is movably arranged on the supporting seat, a rotating shaft is rotatably arranged on the sliding base, the friction force measuring mechanism comprises a strain part, a loading mechanism, a counterweight and a displacement sensor, the strain part is of a Chinese character 'shan' -shaped structure, deformation gaps are formed in two support arms of the strain part, the support arms of the strain part are divided into a deformation supporting part positioned on the outer side and an elastic part positioned on the inner side by the deformation gaps, the deformation supporting part and the elastic part are connected at the upper ends, an intermediate arm of the strain part is connected with the lower ends of the elastic parts on the two support arms through transverse arms of the deformation supporting part, the lower ends of the deformation supporting parts of the two support arms of the strain part are respectively provided with a displacement sensor, the strain part is connected with the rotating shaft on the sliding base through the deformation supporting parts of the two support arms, and the loading mechanism is arranged at the end part of the free end of the intermediate arm of the strain part.
Description
Technical Field
The invention relates to a friction force measuring structure of a micro test force, which is mainly used for measuring the friction force under the loading condition of the micro test force.
Background
In the prior art, the measurement of friction force of a tiny test force is always a technical problem. The existing friction force measurement is mostly carried out by adopting a friction force sensor, but the existing friction force sensor has the defects of complex structure and low measurement precision, and particularly can not realize high-precision measurement on tiny friction force.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a micro test force friction force measuring structure which has a simple structure and can realize micro friction force measurement.
The invention is realized by the following technical scheme: a friction force measuring structure of micro test force is characterized in that: including supporting seat, slide base, friction force measuring mechanism, be provided with guide rail and ball on the supporting seat, the slide base movably set up on the guide rail on the supporting seat and with ball on the supporting seat is connected, rotationally be provided with the pivot on the slide base, friction force measuring mechanism package strain part, loading mechanism, counter weight, displacement sensor, the whole mountain font structure that is of strain part, all be provided with along its length direction's deformation gap on two support arms of strain part, deformation gap will the support arm of strain part divide into the deformation supporting part that is located the outside and the elastic component that is located the inboard, the elastic component is the elastic slice structure, deformation supporting part with the elastic component is connected at the upper end, the middle arm of strain part is connected with the lower extreme of the elastic component on two support arms through its transverse arm, the lower extreme of the deformation supporting part of two support arms of strain part is provided with one respectively displacement sensor, strain part is through the support part on its two support parts with the slide base the deformation supporting part that is located the elastic component is in the middle part is provided with the free deformation part is located at the support arm.
According to the invention, the sliding base and the friction force measuring mechanism connected with the sliding base can be driven to move along the guide rail through the rotation of the ball screw, so that the device is suitable for different sample distances. The loading mechanism can load a certain test force on a sample positioned below the loading mechanism, and the counterweight is used for balancing the strain component. The lower sample is contacted with the upper sample connected with the loading mechanism in the rotating or reciprocating process to generate certain friction force, the friction force is transmitted to the elastic part on the support arm through the middle arm of the strain part, certain deformation is generated after the elastic part is stressed, the corresponding deformation amounts are respectively measured through the displacement sensors at the two sides, and the corresponding friction force can be calculated through the differential calculation of the two deformation amounts. The strain part in the invention utilizes the lever amplification principle, and converts the deformation generated by tiny friction force into larger displacement change of the elastic part of the strain part through the lever amplification principle, so that the accurate deformation of the elastic part is measured through the displacement sensor, and finally, the accurate friction force value can be obtained through differential calculation.
Further, in order to ensure the loading of the micro test force, the loading mechanism is a weight loading mechanism.
Further, the middle arm of the strain part is of a hollow structure. The middle arm of the strain part adopts a hollow structure, so that the weight of the strain part can be reduced, the balance sensitivity can be adjusted, and the accuracy of measuring friction force can be improved.
Further, the lower part of the strain part is provided with a U-shaped bracket, and the strain part is connected with a rotating shaft on the sliding base through the U-shaped bracket. When the U-shaped bracket is adopted, deformation supporting parts on two sides of the strain part can be arranged on two support arms of the U-shaped bracket, and the transverse arm and the elastic part of the strain part can be suspended between the two support arms of the U-shaped bracket, so that the strain part of the strain part is not influenced by external force, and the measurement precision is ensured.
Further, in order to ensure the measurement accuracy, the width of the deformation gap of the strain component is 1mm-3mm, the thickness of the elastic part of the strain component is 0.2mm-2mm, and the ratio of the length of the support arm of the strain component to the width of the deformation gap is 40-120.
Further, one end of the ball screw is connected with a hand wheel. The ball screw can be conveniently rotated through the hand wheel so as to adjust the position of the sliding base and the friction force measuring mechanism.
Further, a locking mechanism for locking the sliding base is arranged on the sliding base corresponding to the guide rail on the supporting base. After the sliding base is adjusted in place, the sliding base can be locked in position through the locking mechanism.
The invention also provides a strain part for the friction force measuring structure with small test force, which adopts the following technical scheme: the whole is the mountain-shaped structure, all is provided with the deformation gap along its length direction on two support arms of strain part, deformation gap will the support arm of strain part divide into the deformation supporting part that is located the outside and the elastic part that is located the inboard, the elastic part is the elastic sheet structure, deformation supporting part with the elastic part is connected at the upper end, the middle arm of strain part is connected with the lower extreme of the elastic part on two support arms through its transverse arm, the lower extreme of the deformation supporting part of two support arms of strain part is provided with a displacement sensor respectively.
Further, the middle arm of the strain part is hollow. The middle arm adopts a hollow structure, so that the weight of a strain part can be reduced, the balance sensitivity can be adjusted, and the accuracy of measuring friction force can be improved.
Further, in order to ensure the measurement accuracy, the width of the deformation gap of the strain member is 1mm to 3mm, the thickness of the elastic portion of the strain member is 0.2mm to 2mm, and the ratio of the length of the arm of the strain member to the width of the deformation gap is 40 to 120.
The beneficial effects of the invention are as follows: the invention has simple structure, the deformation generated by tiny friction force can be converted into larger displacement change of the elastic part of the strain part by utilizing the lever amplification principle by adopting the strain part with special structural design, thereby the accurate deformation of the elastic part can be measured by the displacement sensor, and finally the accurate friction force value can be obtained by calculation, and the measurement precision is high. The invention can realize the measurement of the micro friction force under the loading of the micro test force, the friction force measuring range can reach 0.001N-1N and 0.002N-2N, and the invention can be widely applied to the measurement of the micro friction force under various conditions.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a side view of FIG. 1;
FIG. 3 is a top view of FIG. 1 (loading mechanism and counterweight not shown);
FIG. 4 is a schematic view of the structure of the strain element of the present invention;
FIG. 5 is a top view of FIG. 4;
FIG. 6 is a side view of FIG. 4;
in the figure, 1, a supporting seat, 2, a sliding base, 3, a hand wheel, 4, a ball screw, 5, a counterweight, 6, a strain part, 601, a support arm, 602, a middle arm, 603, a transverse arm, 604, a deformation gap, 605, a deformation supporting part, 606, an elastic part, 607, a hole, 7, a loading mechanism, 8, a guide rail, 9, a locking mechanism, 10, a rotating shaft, 11, a U-shaped bracket, 12 and a displacement sensor
Detailed Description
The invention is further illustrated by the following non-limiting examples, in conjunction with the accompanying drawings:
as shown in the drawings, the friction force measuring structure for the micro test force comprises a supporting seat 1, a sliding base 2 and a friction force measuring mechanism. The support seat 1 is provided with two guide rails 8 and a ball screw 4, and the sliding base 2 is movably arranged on the guide rails 8 on the support seat 1 and is connected with the ball screw 4 on the support seat 1. A hand wheel 3 for the patent ball screw 4 is connected to one end of the ball screw 4. The sliding base 2 is provided with a locking mechanism 9 corresponding to the guide rail 8 on the supporting base 1, and the locking mechanism 9 is a locking screw. The sliding base 2 is provided with a rotatable rotating shaft 10, and two ends of the rotating shaft 10 are supported on the sliding base 2 through bearings. The friction force measuring mechanism comprises a strain part 6, a loading mechanism 7, a counterweight 5 and 2 displacement sensors 5. The strain component 6 is in a generally mountain-shaped structure, deformation gaps 604 along the length direction of the strain component 6 are formed in two support arms 601 of the strain component 6, the deformation gaps 604 divide the support arms 601 of the strain component 6 into a deformation supporting portion 605 located on the outer side and an elastic portion 606 located on the inner side, the elastic portion 606 is in an elastic sheet structure, the thickness of the elastic sheet structure is thinner, and the thickness of the deformation supporting portion 605 is thicker, so that the strain component 6 is mainly fixed. The deformation supporting portion 605 and the elastic portion 606 are connected at the upper end, that is, the upper end of the deformation slit 604 is not penetrated, and the lower end thereof is opened. The intermediate arm 602 of the strain element 6 is connected by its transverse arm 603 to the lower ends of the resilient portions 606 of the two arms 601. The deformation supporting portions 605 of the two arms 601 of the strain member 6 are respectively provided at lower ends thereof with one of the displacement sensors 12, and the two displacement sensors 12 are provided corresponding to the ends of the lateral arm 603 of the strain member 6. The displacement sensor 12 is of the prior art. The lower part of the strain part 6 is provided with a U-shaped bracket 11, the U-shaped bracket 11 is fixedly connected with the upper part of the rotating shaft 10 on the sliding base 2 through a screw, and the deformation supporting parts 605 of the two support arms 601 of the strain part 6 are respectively connected with the two support arms of the U-shaped bracket 11. The strain element 6 is rotatable with the shaft 10. The loading mechanism 7 is arranged at the end of the free end of the intermediate arm 602 of the strain element 6. A counterweight 5 is connected to each of the two deformation supporting portions 605 of the strain member 6.
In this embodiment, the loading mechanism 7 is a weight loading mechanism.
In order to reduce the weight of the strain element, facilitate the adjustment of the balance sensitivity and increase the accuracy of measuring the friction force, the middle arm 602 of the strain element 6 in this embodiment adopts a hollow structure, and a hole 607 is provided in the middle.
In this embodiment, the width of the deformation gap 604, the thickness of the elastic portion 606, and the ratio of the length of the arm of the strain element 6 to the width of the deformation gap 604 should meet the deformation requirement, and in order to ensure the measurement accuracy, it is preferable in the present invention that the width of the deformation gap 604 of the strain element 6 is 1mm-3mm, the thickness of the elastic portion 606 of the strain element 6 is 0.2mm-2mm, and the ratio of the length of the arm of the strain element 6 to the width of the deformation gap 604 is 40-120.
When the invention works, the ball screw 4 is rotated by the hand wheel 3, the rotation of the ball screw 4 can drive the sliding bottom, 2 and the friction force measuring mechanism connected with the sliding base 2 to move along the guide rail 8 so as to adapt to different sample distances. The loading mechanism 7 can load a certain test force on a sample positioned below the loading mechanism 7 through weight loading, and the counterweight 5 is used for balancing the strain components. The lower sample is contacted with the upper sample connected with the loading mechanism 7 in the rotating or reciprocating process to generate certain friction force, the friction force is transmitted to the elastic part 606 on the support arm 601 through the middle arm 602 of the strain part 6, the elastic part 606 generates certain deformation after being stressed, the corresponding deformation amounts are respectively measured through the displacement sensors 12 on the two sides, and the corresponding friction force can be calculated through differential calculation of the two measured deformation amounts.
The strain part in the invention utilizes the lever amplification principle, and converts the deformation generated by tiny friction force into larger displacement change of the elastic part of the strain part through the lever amplification principle, so that the accurate deformation of the elastic part is measured through the displacement sensor, and finally, the accurate friction force value can be obtained through differential calculation.
The invention has simple structure, can realize the measurement of tiny friction force and has high measurement precision. The invention can be widely applied to various occasions for measuring the tiny friction force.
Other parts in this embodiment are all of the prior art, and are not described herein.
Claims (10)
1. A friction force measuring structure of micro test force is characterized in that: comprises a supporting seat (1), a sliding base (2) and a friction force measuring mechanism, wherein a guide rail and a ball screw (4) are arranged on the supporting seat (1), the sliding base (2) is movably arranged on the guide rail on the supporting seat (1) and is connected with the ball screw (4) on the supporting seat (1), a rotating shaft (10) is rotatably arranged on the sliding base (2), the friction force measuring mechanism comprises a strain part (6), a loading mechanism (7), a counterweight and a displacement sensor, the strain part (6) is of a mountain-shaped structure integrally, deformation gaps (604) along the length direction of the strain part are formed in two support arms of the strain part (6), the deformation gaps (604) divide the support arms of the strain part (6) into a deformation supporting part (605) positioned on the outer side and an elastic part (606) positioned on the inner side, the elastic part (606) is of an elastic sheet structure, the deformation supporting part (605) and the elastic part (606) are connected with the upper end, the middle arm (6) is provided with two elastic parts (605) of the lower end parts of the strain part (6) of the middle arm (603) which are connected with the lower end parts of the two support arms (606) respectively, the strain component (6) is connected with a rotating shaft (10) on the sliding base (2) through deformation supporting parts (605) of two support arms of the strain component, the loading mechanism is arranged at the end part of the free end of the middle arm of the strain component (6), and the balance weights are respectively arranged at the two deformation supporting parts (605) of the strain component (6).
2. The minute test force friction force measuring structure according to claim 1, characterized in that: the loading mechanism is a weight loading mechanism.
3. The minute test force friction force measuring structure according to claim 1, characterized in that: the middle arm of the strain part (6) is of a hollow structure.
4. The minute test force friction force measuring structure according to claim 1, characterized in that: the lower part of the strain part (6) is provided with a U-shaped bracket (11), and the strain part (6) is connected with a rotating shaft (10) on the sliding base (2) through the U-shaped bracket (11).
5. The minute test force friction force measuring structure according to claim 1 or 2 or 3 or 4, characterized in that: the width of the deformation gap (604) of the strain component (6) is 1mm-3mm, the thickness of the elastic part (606) of the strain component (6) is 0.2mm-2mm, and the ratio of the length of the support arm of the strain component (6) to the width of the deformation gap (604) is 40-120.
6. The minute test force friction force measuring structure according to claim 1, characterized in that: one end of the ball screw (4) is connected with a hand wheel.
7. The minute test force friction force measuring structure according to claim 1, characterized in that: the sliding base (2) is provided with a locking mechanism for locking the sliding base (2) corresponding to the guide rail on the supporting seat (1).
8. A strain part for a micro test force friction force measuring structure is characterized in that: the whole is the mountain-shaped structure, all is provided with deformation gap (604) along its length direction on two support arms of strain part, deformation gap (604) will the support arm of strain part divide into deformation supporting part (605) and the elastic part (606) that are located the inboard in the outside, elastic part (606) are the elastic sheet structure, deformation supporting part (605) with elastic part (606) are connected at the upper end, the middle arm of strain part is connected with the lower extreme of elastic part (606) on two support arms through its transverse arm (603), the lower extreme of deformation supporting part (605) of two support arms of strain part is provided with a displacement sensor respectively.
9. The strain member for a minute test force friction measuring structure according to claim 8, wherein: the middle arm of the strain part is hollow.
10. The strain member for a minute test force friction measuring structure according to claim 8 or 9, characterized in that: the width of the deformation gap (604) of the strain member is 1mm-3mm, the thickness of the elastic portion (606) of the strain member is 0.2mm-2mm, and the ratio of the length of the arm of the strain member to the width of the deformation gap (604) is 40-120.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910782352.XA CN110346071B (en) | 2019-08-23 | 2019-08-23 | Friction measuring structure for micro test force |
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| CN201910782352.XA CN110346071B (en) | 2019-08-23 | 2019-08-23 | Friction measuring structure for micro test force |
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| CN110346071A CN110346071A (en) | 2019-10-18 |
| CN110346071B true CN110346071B (en) | 2024-02-06 |
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| US6363798B1 (en) * | 2000-07-24 | 2002-04-02 | Norm Gitis | Method and device for measuring forces |
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| CN104297089A (en) * | 2014-10-15 | 2015-01-21 | 中国矿业大学 | Microcosmic frictional wear performance testing device |
| CN204165674U (en) * | 2014-11-10 | 2015-02-18 | 深圳市中图仪器科技有限公司 | The small device for measuring force of a kind of high-precision digital grating feedback |
| CN210221354U (en) * | 2019-08-23 | 2020-03-31 | 济南益华摩擦学测试技术有限公司 | Micro test force friction force measuring structure and strain part thereof |
-
2019
- 2019-08-23 CN CN201910782352.XA patent/CN110346071B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10267819A (en) * | 1997-03-28 | 1998-10-09 | Japan Tobacco Inc | Frictional-wear testing machine |
| US6363798B1 (en) * | 2000-07-24 | 2002-04-02 | Norm Gitis | Method and device for measuring forces |
| CN1645077A (en) * | 2005-01-27 | 2005-07-27 | 上海交通大学 | Two-dimensional micro-force measuring sensors |
| CN101339113A (en) * | 2008-08-19 | 2009-01-07 | 东南大学 | Machine tool main shaft axle journal shaft bushing friction performance test machine |
| CN104297089A (en) * | 2014-10-15 | 2015-01-21 | 中国矿业大学 | Microcosmic frictional wear performance testing device |
| CN204165674U (en) * | 2014-11-10 | 2015-02-18 | 深圳市中图仪器科技有限公司 | The small device for measuring force of a kind of high-precision digital grating feedback |
| CN210221354U (en) * | 2019-08-23 | 2020-03-31 | 济南益华摩擦学测试技术有限公司 | Micro test force friction force measuring structure and strain part thereof |
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