CN112033893A - Friction coefficient measuring device and measuring method - Google Patents
Friction coefficient measuring device and measuring method Download PDFInfo
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- CN112033893A CN112033893A CN202010471483.9A CN202010471483A CN112033893A CN 112033893 A CN112033893 A CN 112033893A CN 202010471483 A CN202010471483 A CN 202010471483A CN 112033893 A CN112033893 A CN 112033893A
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/02—Measuring coefficient of friction between materials
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Abstract
The invention discloses a friction coefficient measuring device and a measuring method, and the friction coefficient measuring device comprises a bottom bracket assembly, a sliding rail bracket assembly and a pressure sensor, wherein the bottom bracket assembly comprises a side wall and a rolling row, the side wall is arranged at two sides of the rolling row, the side wall is arranged along the rolling direction of the rolling row and is connected with the rolling row, a second test sample is arranged on the rolling row in a floating manner, and one end of the second test sample is propped against the pressure sensor; the slide rail bracket assembly is erected on the side wall and can slide along the side wall, and the first test sample is suspended on the second test sample by the slide rail bracket assembly; the sliding rail support assembly slides along the side wall, sliding friction is generated between the first test sample and the second test sample, and the friction coefficient between the first test sample and the second test sample is calculated according to the pressure value measured by the second test sample jacking pressure sensor. The invention has simple structure and accurate measurement of the friction coefficient.
Description
Technical Field
The invention belongs to the technical field of measuring equipment, and particularly relates to a friction coefficient measuring device and method.
Background
As shown in fig. 1, the conventional friction coefficient measuring device is mostly unfixed for two samples, the force measuring sensor is located on a pull rope of the sample, only the first sample is pulled during force measurement, the first sample slides relative to the second sample, the first sample is considered to be subjected to a pulling force equal to the sliding friction force during uniform motion of the first sample, the force on the force measuring sensor is recorded, namely the first sample is considered to be equal to the friction force received, however, the uniform motion state is not accurately identified, the first sample is not in the uniform velocity state when the sensor records data, and therefore the recorded pulling force is not strictly equal to the friction force received by the first sample, so that the measurement error is caused, and even the error is too large to form errors, and the calculation of the final friction coefficient is influenced. Meanwhile, the conventional friction coefficient measuring device has a complex structure, high requirements on the performance of the tension sensor, strict requirements on the working environment and harsh use conditions.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a friction coefficient measuring device which is simple in structure and can accurately measure friction coefficient.
In order to achieve the above object, in a first aspect of the present invention, a friction coefficient measuring device is provided, including a bottom bracket assembly, a sliding rail bracket assembly, and a pressure sensor, where the bottom bracket assembly includes a side wall and a rolling row, the two sides of the rolling row are provided with side walls, the side walls are arranged along a rolling direction of the rolling row and connected to the rolling row, the rolling row floats upwards to place a second test sample, and one end of the second test sample abuts against the pressure sensor; the slide rail bracket assembly is erected on the side wall and can slide along the side wall, and a first test sample is suspended on the slide rail bracket assembly; the slide rail bracket assembly slides along the side wall, sliding friction is generated between the first test sample and the second test sample, and the friction coefficient between the first test sample and the second test sample is calculated according to the pressure value measured by the second test sample pressing the pressure sensor.
Further, the slide rail support assembly includes the cantilever beam and embraces the arm, suspend in midair on the cantilever beam embrace the arm, it is fixed on the arm to embrace the first test sample, first pulley has on the cantilever beam, the cantilever beam passes through first pulley erects in on the lateral wall.
Furthermore, the position of the arm in the vertical direction of the cantilever beam is adjustable.
Further, the distance between the side walls arranged on the two sides of the rolling row is adjustable, and the length of the cantilever beam erected on the side walls is adjustable.
Further, bottom sprag assembly still is including setting up the inboard sideslip wheel of lateral wall, the both sides of second test sample by the sideslip wheel is spacing.
Further, the roller row comprises a plurality of rollers arranged at intervals, a second pulley is arranged on each roller, and the second test sample is arranged on the second pulley in a floating mode.
In a second aspect of the present invention, there is provided a method for measuring a friction coefficient by using the above measuring apparatus, including the following steps:
pushing the slide rail bracket to move towards the direction of the pressure sensor, and generating sliding friction between contact surfaces of the first test sample and the second test sample;
reading a pressure value measured by the second test sample pressing the pressure sensor;
inputting the pressure value and the mass of the first test sample and the second test sample into a friction coefficient calculation equation, and calculating the friction coefficient of the first test sample and/or the second test sample.
Further, the power for pushing the pulley bracket to move towards the pressure sensor is provided manually or electrically.
According to the invention, under the matching of the slide rail bracket assembly, the bottom bracket assembly and the pressure sensor, the sliding friction force between the second test sample and the first test sample acts on the second test sample which is floated on the roller row and is in a free state, and the friction coefficient is calculated through the pressure value measured by the second test sample pressing on the pressure sensor, so that the motion state of the first test sample is not required to be considered during force measurement, the problem of overlarge measurement error caused by the influence of the existing measurement condition is solved, the measurement precision is improved, and the structure of the measurement device is simple.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic view of the measurement principle of a friction coefficient measuring device of the prior art;
FIG. 2A is a perspective view of a friction coefficient measuring device according to an embodiment of the present invention;
FIG. 2B is a front view of a friction coefficient measuring device according to an embodiment of the present invention;
FIG. 2C is a side view of a friction coefficient measuring device according to an embodiment of the present invention;
FIG. 2D is a top view of a device for measuring coefficient of friction according to an embodiment of the present invention;
FIG. 3A is a front view of a bottom bracket assembly of the device for measuring coefficient of friction according to one embodiment of the present invention;
FIG. 3B is a side view of a bottom bracket assembly in an apparatus for measuring coefficient of friction according to an embodiment of the present invention;
FIG. 3C is a top view of a bottom bracket assembly in an apparatus for measuring coefficient of friction according to an embodiment of the present invention;
FIG. 4A is a perspective view of a sliding rail bracket assembly of the friction coefficient measuring device according to an embodiment of the present invention;
FIG. 4B is a front view of a sliding rail bracket assembly of the device for measuring coefficient of friction according to an embodiment of the present invention;
FIG. 4C is a bottom view of a sliding track bracket assembly of the device for measuring coefficient of friction according to an embodiment of the present invention;
FIG. 5 is a schematic view of the operation of the friction coefficient measuring device of the present invention;
fig. 6 is a flowchart illustrating a friction coefficient measuring method according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 2A-2D, the friction coefficient measuring device of the present invention includes a bottom bracket assembly 1, a sliding rail bracket assembly 2, and a pressure sensor 3, where the bottom bracket assembly 1 includes a side wall 11 and a roller row 12, the side wall 11 is disposed on two sides of the roller row 12, the side wall 11 is disposed along a rolling direction of the roller row 12 and connected to the roller row 12, the roller row 12 floats on a second test sample 4, and one end of the second test sample 4 abuts against the pressure sensor 3; the slide rail bracket assembly 2 is erected on the side wall 11 and can slide along the side wall 11, and the first test sample 5 is suspended on the second test sample 4 by the slide rail bracket assembly 2; the slide rail bracket assembly 2 slides along the side wall 11, sliding friction is generated between the first test sample 5 and the second test sample 4, and a friction coefficient between the first test sample 5 and the second test sample 4 is calculated according to a pressure value measured by pressing the second test sample 4 against the pressure sensor 3.
Optionally, as shown in fig. 4A to 4C, the slide rail bracket assembly 2 includes a cantilever beam 21 and a cantilever 22, the cantilever beam 21 suspends the cantilever 22, the cantilever 22 fixes the first test sample 5, the cantilever beam 21 has a first pulley 23 thereon, and the cantilever beam 21 is erected on the side wall 11 through the first pulley 23. The cantilever beam 21 has jaw-type limiting frames 212 at both ends thereof, so that the cantilever beam 21 can be separated when sliding on the side wall 11. The upper part of the side wall 11 is equivalent to a guide rail, and the first pulleys 23 at two sides of the cantilever beam 21 are in contact with the upper edge of the side wall 11 along the wheel rail, so that the influence of the friction force of the sliding rail bracket assembly 2 sliding on the side wall 11 can be reduced, and the measurement accuracy of the friction coefficient can be further improved.
Optionally, the position of the embracing arm 22 in the vertical direction of the cantilever beam 21 is adjustable. In this embodiment, a plurality of connecting holes 221 are formed in the arm 22 in the vertical direction, the arm 22 penetrates through the connecting holes 221 through bolts to be fixedly connected with the cantilever beam 21, and the height of the arm 22 is adjusted by penetrating through the connecting holes at different positions through the bolts, so that the first test sample 5 on the arm 22 can freely slide relative to the second test sample 4 to generate sliding friction. The height of the arm 22 can be adjusted, so that the arm can adapt to the sliding friction force generated between the first test sample 5 and the second test sample 4 with different sizes, and the measurement flexibility of the whole set of equipment is improved. The height of the arm 22 on the cantilever beam 21 is not limited to this, and may be automatically adjusted by a motor, an air cylinder, or the like.
As shown in fig. 3A to 3C, two side walls 11 of the bottom bracket assembly 1 are disposed opposite to each other, a roller row 12 is connected to the two side walls 11 by a pin 13, and the second test specimen 4 is freely placed on the roller row 12 and can move toward the pressure sensor 3 side by the rolling action of the roller row 12 to press the pressure sensor 3 to generate pressure.
Optionally, the roller row 12 includes a plurality of spaced rollers 121, a second pulley 122 is disposed on the roller 121, and the second test sample 4 is floated on the second pulley 122 of the roller row 12. The second pulley 122 may reduce the influence of the friction force of the second test specimen 4 placed on the roller row 12 to further improve the accuracy of the measurement of the friction coefficient.
Optionally, the bottom bracket assembly 1 further includes a side pulley 111 disposed inside the sidewall 11, and two sides of the second test sample 4 are limited by the side pulley 111, so as to ensure that the second test sample 4 does not shift when slightly rolling along the roller row 12, and further eliminate friction between the second test sample 4 and the sidewall 11, thereby further improving the measurement accuracy of the friction coefficient.
Optionally, the distance between the side walls 11 arranged at both sides of the roller row 12 is adjustable, and the length of the cantilever beam 21 erected on the side walls 11 is adjustable. The second test samples 4 with different widths can be placed on the roller row 12 by adjusting the distance between the side walls 11 and the length of the cantilever beam 21, so that the measurement of the second test samples with different sizes is adapted, and the measurement flexibility of the whole set of equipment is further improved.
In order to make the technical solution of the present invention more clearly understood by those skilled in the art, the principle of measuring the friction coefficient by the friction coefficient measuring device of the present invention is described below with reference to fig. 5.
As shown in fig. 5, the second test sample is freely placed on the bottom roller row, the front end of the second test sample abuts against the pressure sensor, the left side plate and the right side plate appropriately clamp the second test sample through the first pulley (preferably, the second test sample can freely slide on the roller row and the side wall roller), the upper slide rail bracket assembly provides power during operation manually or electrically, the first test sample in the arm is driven to freely slide towards the front end, and at the moment, the first test sample and the second test sample generate sliding friction.
The second test sample is balanced in stress due to the fact that the second test sample is still, and the sliding friction force of the first test sample on the second test sample and the pressure of the pressure sensor on the second test sample are balanced, equal in magnitude and opposite in direction, namely the sliding friction force and the pressure of the pressure sensor on the second test sample are balanced, namely the sliding friction force and the pressure of the second test sample are balanced
FN＝-Ff
So coefficient of friction
μ＝FN/m
Wherein:
ff, the sliding friction force of the first test sample on the second test sample;
FN pressure of the pressure sensor to the second test sample;
m: the mass of the first test sample.
The friction coefficient between the first test sample and the second test sample can be obtained through the friction coefficient.
As shown in fig. 6, the method for measuring the friction coefficient by the measuring device of the present invention comprises the following steps:
step S11: pushing the slide rail bracket to move towards the direction of the pressure sensor, and generating sliding friction between contact surfaces of the first test sample and the second test sample;
step S21: reading a pressure value measured by the second test sample pressing the pressure sensor;
step S31: inputting the pressure value and the mass of the first test sample and the second test sample into a friction coefficient calculation equation, and calculating the friction coefficient of the first test sample and/or the second test sample.
Alternatively, the power for pushing the pulley bracket to move towards the pressure sensor is provided manually or electrically.
The invention uses the pressure of the second test sample to replace the tension of the first test sample measured by the existing tester, thereby the motion state of the first test sample slide block does not need to be considered, the measurement result is equal to the friction force between the surfaces of the two test samples, and the problem that the motion state of the slide block is difficult to determine, which causes the inequality of the measured tension and the sliding friction force is avoided, the measurement precision of the friction coefficient is improved, the test method is simple and convenient to operate, and the use requirement and the use cost of the tester are reduced.
The terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying a number of the indicated technical features. Thus, a defined feature of "first", "second", may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. The friction coefficient measuring device is characterized by comprising a bottom support assembly, a sliding rail support assembly and a pressure sensor, wherein the bottom support assembly comprises side walls and a rolling row, the side walls are arranged on two sides of the rolling row, the side walls are arranged along the rolling direction of the rolling row and are connected with the rolling row, a second test sample is placed on the rolling row in a floating mode, and one end of the second test sample abuts against the pressure sensor; the slide rail bracket assembly is erected on the side wall and can slide along the side wall, and a first test sample is suspended on the slide rail bracket assembly; the slide rail bracket assembly slides along the side wall, sliding friction is generated between the first test sample and the second test sample, and the friction coefficient between the first test sample and the second test sample is calculated according to the pressure value measured by the second test sample pressing the pressure sensor.
2. The device for measuring the friction coefficient according to claim 1, wherein the slide rail bracket assembly includes a cantilever beam and a cantilever arm, the cantilever beam suspends the cantilever arm, the cantilever arm fixes the first test sample thereon, the cantilever beam has a first pulley thereon, and the cantilever beam is mounted on the side wall through the first pulley.
3. A device for measuring coefficient of friction as set forth in claim 2 wherein said depending arm is adjustable in position in the vertical direction of said cantilevered beam.
4. The apparatus for measuring friction coefficient according to claim 2, wherein the distance between the side walls disposed at both sides of the roller row is adjustable, and the length of the cantilever beam erected on the side walls is adjustable.
5. The apparatus of claim 1, wherein the bottom bracket assembly further comprises a side wheel disposed inside the sidewall, wherein two sides of the second test specimen are captured by the side wheel.
6. The apparatus for measuring friction coefficient according to claim 1, wherein said roller array comprises a plurality of spaced rollers, said rollers having second pulleys, said second test specimen being levitated on said second pulleys of said roller array.
7. A method of measuring a coefficient of friction using a measuring device as claimed in any one of claims 1 to 6, comprising the steps of:
pushing the slide rail bracket to move towards the direction of the pressure sensor, and generating sliding friction between contact surfaces of the first test sample and the second test sample;
reading a pressure value measured by the second test sample pressing the pressure sensor;
inputting the pressure value and the mass of the first test sample and the second test sample into a friction coefficient calculation equation, and calculating the friction coefficient of the first test sample and/or the second test sample.
8. The method of measuring a coefficient of friction according to claim 7 wherein the power to move the pulley carriage toward the pressure sensor is provided manually or electrically.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010471483.9A CN112033893A (en) | 2020-05-28 | 2020-05-28 | Friction coefficient measuring device and measuring method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010471483.9A CN112033893A (en) | 2020-05-28 | 2020-05-28 | Friction coefficient measuring device and measuring method |
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| CN112033893A true CN112033893A (en) | 2020-12-04 |
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| CN202010471483.9A Pending CN112033893A (en) | 2020-05-28 | 2020-05-28 | Friction coefficient measuring device and measuring method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112730220A (en) * | 2020-12-21 | 2021-04-30 | 奇瑞汽车股份有限公司 | Seat surface friction force testing device and testing method |
| CN113358555A (en) * | 2021-05-19 | 2021-09-07 | 南京航空航天大学 | Test device and test method for measuring friction coefficient of sealing ring under different compression ratios |
| CN115931704A (en) * | 2022-12-08 | 2023-04-07 | 中国建材检验认证集团江苏有限公司 | Test device for detecting friction coefficient of municipal road pavement |
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| US20060162420A1 (en) * | 2005-01-25 | 2006-07-27 | Pappas John C | Friction coefficient measuring system and method |
| CN104764690A (en) * | 2015-03-31 | 2015-07-08 | 电子科技大学 | Dynamic and static friction experimental device for eliminating speed effect |
| CN109211775A (en) * | 2018-09-10 | 2019-01-15 | 武汉轻工大学 | A kind of dynamic friction coefficient measuring device |
| DE102019123546A1 (en) * | 2018-09-28 | 2020-04-02 | Dr. Schneider Kunststoffwerke Gmbh | Measuring device for determining friction coefficients |
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2020
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060162420A1 (en) * | 2005-01-25 | 2006-07-27 | Pappas John C | Friction coefficient measuring system and method |
| CN104764690A (en) * | 2015-03-31 | 2015-07-08 | 电子科技大学 | Dynamic and static friction experimental device for eliminating speed effect |
| CN109211775A (en) * | 2018-09-10 | 2019-01-15 | 武汉轻工大学 | A kind of dynamic friction coefficient measuring device |
| DE102019123546A1 (en) * | 2018-09-28 | 2020-04-02 | Dr. Schneider Kunststoffwerke Gmbh | Measuring device for determining friction coefficients |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112730220A (en) * | 2020-12-21 | 2021-04-30 | 奇瑞汽车股份有限公司 | Seat surface friction force testing device and testing method |
| CN113358555A (en) * | 2021-05-19 | 2021-09-07 | 南京航空航天大学 | Test device and test method for measuring friction coefficient of sealing ring under different compression ratios |
| CN113358555B (en) * | 2021-05-19 | 2023-02-10 | 南京航空航天大学 | Test device and test method for measuring friction coefficient of sealing ring under different compression ratios |
| CN115931704A (en) * | 2022-12-08 | 2023-04-07 | 中国建材检验认证集团江苏有限公司 | Test device for detecting friction coefficient of municipal road pavement |
| CN115931704B (en) * | 2022-12-08 | 2023-09-15 | 中国建材检验认证集团江苏有限公司 | A test device for detecting municipal road surface coefficient of friction |
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