CN110567625A - Device and method for measuring maximum static friction force of parking wedge - Google Patents
Device and method for measuring maximum static friction force of parking wedge Download PDFInfo
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- CN110567625A CN110567625A CN201910859838.9A CN201910859838A CN110567625A CN 110567625 A CN110567625 A CN 110567625A CN 201910859838 A CN201910859838 A CN 201910859838A CN 110567625 A CN110567625 A CN 110567625A
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- 230000003068 static effect Effects 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000010720 hydraulic oil Substances 0.000 claims description 29
- 229910001018 Cast iron Inorganic materials 0.000 claims description 20
- 239000003921 oil Substances 0.000 claims description 19
- 238000005259 measurement Methods 0.000 claims description 12
- 238000012360 testing method Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000002184 metal Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 238000005452 bending Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0028—Force sensors associated with force applying means
- G01L5/0038—Force sensors associated with force applying means applying a pushing force
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention discloses a device and a method for measuring the maximum static friction force of a parking wedge. The device and the method for measuring the maximum static friction force of the parking wedge can accurately measure the maximum static friction force of the parking wedge and can conveniently display the change process of the static friction force of the parking wedge in the pressure loading process.
Description
Technical Field
the invention relates to a device for measuring maximum static friction force, in particular to a device for measuring maximum static friction force of a parking wedge and a measuring method thereof.
background
At present, the known physical friction force measuring device is composed of a metal plate, an object block and a spring dynamometer. When the metal plate is placed on a horizontal table top in a static mode during measurement, the object block is placed on the metal plate, the right end of the object block is hooked by the spring dynamometer, the object block is pulled rightwards by a hand through the spring dynamometer, and when the object block starts to move rightwards, the reading value of the spring dynamometer is the maximum static friction force. The method is completely operated manually, has great measurement error, can only be used for principle demonstration, and cannot carry out accurate industrial measurement.
a parking wedge is a device that prevents a vehicle from slipping when parked. The friction of the parking wedge against the ground is an important measure of its performance. However, no device for measuring the maximum static friction force of the parking wedge exists at present. In order to overcome the defects of poor measurement precision of the maximum static friction force and filling up the blank of the measurement of the maximum static friction force of the parking wedge, the invention provides the measurement device for the maximum static friction force of the parking wedge.
Disclosure of Invention
The invention aims to provide a device and a method for measuring the maximum static friction force of a parking wedge, which can accurately measure the maximum static friction force of the parking wedge and conveniently display the change process of the static friction force of the parking wedge in the pressure loading process.
in order to achieve the purpose, the invention provides the following technical scheme:
A parking wedge maximum static friction force measuring device comprises a base, wherein two stand columns are fixed at the upper end of the base, the upper ends of the two stand columns are fixed with a cross beam, a slide rail is fixed at the lower end of the cross beam, a slide base is arranged on the slide rail, a vertical pressure hydraulic cylinder is fixed at the lower end of the slide base, a vertical pressure head is arranged at the lower end of the vertical pressure hydraulic cylinder, a vertical pressure sensor is arranged between the vertical pressure head and the vertical pressure hydraulic cylinder, a horizontal cylinder support is arranged on one of the stand columns, a horizontal thrust hydraulic cylinder is fixed at one end of the horizontal cylinder support, a horizontal pressure head is arranged at the end of the horizontal thrust hydraulic cylinder far away from the horizontal cylinder support, a horizontal pressure sensor is arranged between the horizontal thrust hydraulic cylinder and the horizontal pressure head, the vertical pressure head and the, the pressure synthesis shaft is arranged in a pin hole of the connector, the connector is fixed at the upper end of the loading pressing plate, and a rubber layer is fixed at the lower end of the loading pressing plate.
Preferably, a cast iron flat plate is fixed at the upper end of the base.
preferably, a hydraulic station is provided in the base.
preferably, a hydraulic station manipulator is arranged on the outer wall of the base.
Preferably, the method for measuring the maximum static friction force of the parking wedge comprises the following steps:
(1) The parking wedge maximum static friction force measuring device is used for measuring, the cast iron flat plate is fixed on the base and cannot be loosened, the inclination angle of the fixed cast iron flat plate and the horizontal plane in any direction is not more than 0.2 degrees, the test surface of the cast iron flat plate is wiped, and oil stains and water stains cannot be caused on the cast iron flat plate;
(2) flatly placing the bottom surface of a parking wedge product test piece on the test surface of the cast iron flat plate, and aligning the lower edge of the loading pressure plate with the lower edge of the parking wedge cambered surface;
(3) firstly, adjusting the oil pressure of a vertical pressure hydraulic oil cylinder to enable the loaded vertical pressure to reach a rated pressure value and then stop pressing down, wherein the pressure value can be displayed by a digital display, and the vertical pressure is kept unchanged in the whole testing process;
(4) Gradually and slowly increasing the oil pressure of the horizontal thrust hydraulic oil cylinder, simultaneously observing the change of the horizontal thrust on a computer display screen, stopping increasing the horizontal thrust when the parking wedge moves horizontally, and finishing the measurement;
(5) And observing a measured friction force change curve chart, wherein the maximum value before the horizontal thrust force is reduced in the curve chart is the maximum static friction force.
Compared with the prior art, the invention has the beneficial effects that:
The invention can accurately measure the maximum static friction force of the parking wedge and conveniently display the change process of the static friction force of the parking wedge in the pressure loading process.
drawings
FIG. 1 is a schematic structural diagram of a device for measuring maximum static friction of a parking wedge according to an embodiment of the present invention;
FIG. 2 is an enlarged view at A in FIG. 1;
FIG. 3 is a graph showing a change in friction force during an increase in horizontal thrust;
FIG. 4 is a prior art friction force measuring device;
In the figure, 1, a base, 2, a column, 3, a beam, 4, a slide rail, 5, a sliding base, 6, a vertical pressure hydraulic oil cylinder, 7, a vertical pressure head, 8, a vertical pressure sensor, 9, a horizontal oil cylinder support, 10, a horizontal thrust hydraulic oil cylinder, 11, a horizontal pressure head, 12, a horizontal pressure sensor, 13, a pressure synthesis shaft, 14, a connector, 15, a loading pressing plate, 16, a rubber layer, 17, a cast iron flat plate, 18, a hydraulic station, 19, a hydraulic station manipulator, 20, a parking wedge, 21, a horizontal tabletop, 22, a metal plate, 23, an object block, 24 and a spring dynamometer.
Detailed Description
the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, a device for measuring the maximum static friction force of a parking wedge includes a base 1, two columns 2 fixed to the upper end of the base 1, and a beam 3 fixed to the upper ends of the two columns 2. The lower end of the cross beam 3 is fixed with a slide rail 4, a sliding base 5 is arranged on the slide rail 4, a vertical pressure hydraulic oil cylinder 6 is fixed at the lower end of the sliding base 5, a vertical pressure head 7 is arranged at the lower end of the vertical pressure hydraulic oil cylinder 6, a vertical pressure sensor 8 is arranged between the vertical pressure head 7 and the vertical pressure hydraulic oil cylinder 6, and the vertical pressure head 7 and the vertical pressure sensor 8 are fixedly arranged at the piston end of the vertical pressure hydraulic oil cylinder 6. A horizontal oil cylinder support 9 is arranged on one of the upright columns 2, the horizontal oil cylinder support 9 can slide on the upright column 2, and the horizontal thrust hydraulic oil cylinder can integrally move up and down along the upright column 2 by adjusting the horizontal oil cylinder support 9. A horizontal thrust hydraulic oil cylinder 10 is fixed at one end of the horizontal oil cylinder support 9, a horizontal pressure head 11 is arranged at one end, far away from the horizontal oil cylinder support 9, of the horizontal thrust hydraulic oil cylinder 10, a horizontal pressure sensor 12 is arranged between the horizontal thrust hydraulic oil cylinder 10 and the horizontal pressure head 11, and the horizontal pressure head 11 and the horizontal pressure sensor 12 are fixedly installed at the piston end of the horizontal thrust hydraulic oil cylinder 10. The vertical pressure head 7 and the horizontal pressure head 11 are respectively hinged with a pressure synthetic shaft 13, the pressure synthetic shaft 13 is pinned in a pin hole of a connector 14, the connector 14 is fixed at the upper end of a loading pressure plate 15, a rubber layer 16 is fixed at the lower end of the loading pressure plate 15, and a cast iron flat plate 17 is fixed at the upper end of the base 1.
A hydraulic station 18 is arranged in the base 1, and a hydraulic station manipulator 19 is arranged on the outer wall of the base 1. The hydraulic station 18 applies loading oil pressure to the vertical pressure hydraulic rams 6 and the horizontal thrust hydraulic rams 10 via the hydraulic station manipulator 19. The vertical pressure sensor 8 is connected with the first transmitter, the first transmitter is connected with the digital display, the horizontal pressure sensor 12 is connected with the second transmitter, the second transmitter is connected with the data acquisition unit, and the data acquisition unit is connected with the computer. The vertical pressure sensor 8 and the horizontal pressure sensor 12 respectively convert the borne pressure into current, and the first transmitter and the second transmitter transmit power supply voltage to the sensors on one hand and transmit the borne sensor current outwards on the other hand. The first transmitter transmits the signal of the vertical pressure sensor 8 to a digital display to display the static numerical value of the positive pressure, the second transmitter transmits the signal of the horizontal pressure sensor 12 to a data acquisition unit to perform digital-to-analog conversion, and the static friction force change curve shown in figure 3 is displayed through computer operation.
A method for measuring the maximum static friction force of a parking wedge comprises the following specific steps:
(1) Fixing the cast iron flat plate 17 on the base 1 without loosening, wiping the test surface of the cast iron flat plate 17 by using the fixed cast iron flat plate 17 at an inclination angle of no more than 0.2 degrees with the horizontal plane in any direction, so that oil stains and water stains cannot be caused on the cast iron flat plate 17;
(2) Flatly placing the bottom surface of a parking wedge 20 product test piece on the test surface of a cast iron flat plate 17, installing a loading pressure plate 15, a vertical pressure hydraulic oil cylinder 6 and a horizontal thrust hydraulic oil cylinder 10 according to the figure 1, and aligning the lower edge of the loading pressure plate 15 with the lower edge of the cambered surface of the parking wedge 20;
(3) Firstly, the oil pressure of a vertical pressure hydraulic oil cylinder 6 is adjusted to ensure that the loaded vertical pressure reaches a rated pressure value FNthen stopping pressing, displaying the pressure value by a digital display, and maintaining the vertical pressure F in the whole test processNThe change is not changed;
(4) Gradually and slowly increasing the oil pressure of the horizontal thrust hydraulic oil cylinder 10, observing the change of the horizontal thrust on a computer display screen, stopping increasing the horizontal thrust when the parking wedge 20 moves horizontally, and finishing the measurement;
(5) The measured friction force variation curve is shown in FIG. 3, in which the maximum value F before the sudden reduction of the horizontal thrust force occursLmaxi.e. the maximum static friction force Fs;
As shown in FIG. 4, the friction force measuring device of the prior art is specifically configured to place a metal plate 22 on a horizontal table surface 21 in a stationary state, place an object 23 on the metal plate 22, hook the right end of the object 23 with a spring force gauge 24, pull the object 23 to the right by hand through the spring force gauge 24, and when the object 23 starts moving to the right, the reading of the spring force gauge 24 is the maximum static friction force. The method is completely operated manually, has great measurement error, can only be used for principle demonstration, and cannot carry out accurate industrial measurement.
The working principle is as follows: the vertical pressure hydraulic oil cylinder 6 and the vertical pressure sensor 8 form a positive pressure FNThe horizontal thrust F is formed by a horizontal pressure sensor 12 and a horizontal thrust hydraulic oil cylinder 10LThe loading system of (1). Horizontal thrust FLForce of static friction FSare of equal magnitude and opposite direction, i.e. the horizontal thrust F is numericallyLEqual to static friction force FS(ii) a Positive pressure FNWith horizontal thrust FLthe resultant force on the pressure resultant shaft 13 is the force of the car tyre on the slope to the parking wedge. Therefore, only under a certain positive pressure FNMeasuring horizontal thrust F under actionLthe value of (A) can obtain the static friction force FSThe size of (2). The vertical pressure sensor 8, the transmitter I and the digital display form a positive pressure FNdisplaying the numerical value; the static friction force F is composed of a horizontal pressure sensor 12, a second transmitter, a data collector, a computer and test software on the computerSThe measurement system of (1). When the vertical loading reaches a certain rated pressure, the horizontal thrust is slowly loaded, and the static friction force between the bottom surface of the parking wedge to be tested and the cast iron flat plate 17 changes, so that the static friction force can be tested. When the parking wedge 20 to be tested starts to move, in order to prevent the bending moment damaging the vertical pressure hydraulic oil cylinder 6 due to the movement of the loading pressing plate 15, the sliding base 5 fixed at the other end of the vertical pressure hydraulic oil cylinder 6 can enable the sliding base to freely horizontally slide along the sliding rail 4, and the destructive effect of the bending moment is eliminated.
The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the present invention as defined in the accompanying claims.
Claims (5)
1. The utility model provides a parking wedge maximum static friction force measuring device which characterized in that: the device comprises a base, two upright posts are fixed at the upper end of the base, the upper ends of the two upright posts are fixed with a cross beam, a slide rail is fixed at the lower end of the cross beam, a sliding base is arranged on the slide rail, a vertical pressure hydraulic oil cylinder is fixed at the lower end of the sliding base, a vertical pressure head is arranged at the lower end of the vertical pressure hydraulic oil cylinder, a vertical pressure sensor is arranged between the vertical pressure head and the vertical pressure hydraulic oil cylinder, a horizontal oil cylinder support is arranged on one upright post, a horizontal thrust hydraulic oil cylinder is fixed at one end of the horizontal oil cylinder support, a horizontal pressure head is arranged at one end of the horizontal thrust hydraulic oil cylinder, which is far away from the horizontal oil cylinder support, a horizontal pressure sensor is arranged between the horizontal thrust hydraulic oil cylinder and the horizontal pressure head, the vertical pressure head, the connector is fixed on the upper end of the loading pressing plate, and a rubber layer is fixed at the lower end of the loading pressing plate.
2. The apparatus for measuring maximum static friction of a parking wedge according to claim 1, wherein: and a cast iron flat plate is fixed at the upper end of the base.
3. The apparatus for measuring maximum static friction of a parking wedge according to claim 2, wherein: a hydraulic station is arranged in the base.
4. the apparatus for measuring maximum static friction of a parking wedge as claimed in claim 3, wherein: and a hydraulic station manipulator is arranged on the outer wall of the base.
5. The method for measuring the maximum static friction force of the parking wedge is characterized by comprising the following steps of:
(1) The parking wedge maximum static friction force measuring device of any one of claims 2 to 4 is used for measuring, a cast iron flat plate is fixed on a base and cannot be loosened, the inclination angle of the fixed cast iron flat plate and the horizontal plane in any direction is not more than 0.2 degrees, the test surface of the cast iron flat plate is wiped, and oil stains and water stains cannot be caused on the cast iron flat plate;
(2) Flatly placing the bottom surface of a parking wedge product test piece on the test surface of the cast iron flat plate, and aligning the lower edge of the loading pressure plate with the lower edge of the parking wedge cambered surface;
(3) firstly, adjusting the oil pressure of a vertical pressure hydraulic oil cylinder to enable the loaded vertical pressure to reach a rated pressure value and then stop pressing down, wherein the pressure value can be displayed by a digital display, and the vertical pressure is kept unchanged in the whole testing process;
(4) Gradually and slowly increasing the oil pressure of the horizontal thrust hydraulic oil cylinder, simultaneously observing the change of the horizontal thrust on a computer display screen, stopping increasing the horizontal thrust when the parking wedge moves horizontally, and finishing the measurement;
(5) And observing a measured friction force change curve chart, wherein the maximum value before the horizontal thrust force is reduced in the curve chart is the maximum static friction force.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910859838.9A CN110567625A (en) | 2019-09-11 | 2019-09-11 | Device and method for measuring maximum static friction force of parking wedge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910859838.9A CN110567625A (en) | 2019-09-11 | 2019-09-11 | Device and method for measuring maximum static friction force of parking wedge |
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| Publication Number | Publication Date |
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| CN110567625A true CN110567625A (en) | 2019-12-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910859838.9A Pending CN110567625A (en) | 2019-09-11 | 2019-09-11 | Device and method for measuring maximum static friction force of parking wedge |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112666075A (en) * | 2020-12-23 | 2021-04-16 | 成都济通路桥科技有限公司 | Novel force measuring device and method for measuring friction coefficient of support in operation period |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001336997A (en) * | 2000-05-30 | 2001-12-07 | Shimadzu Corp | Friction force measuring device and friction force measuring method |
| JP2005351911A (en) * | 2005-09-09 | 2005-12-22 | Nsk Ltd | Device for measuring frictional force |
| CN203534808U (en) * | 2013-09-27 | 2014-04-09 | 中交公路长大桥建设国家工程研究中心有限公司 | Device for static and dynamic multifunctional test of supporting seat |
| CN104777094A (en) * | 2015-04-10 | 2015-07-15 | 清华大学 | Experimental device for testing rubber friction performance |
| CN205879426U (en) * | 2016-08-12 | 2017-01-11 | 刘逸丹 | Biggest stiction testing arrangement |
| CN207832367U (en) * | 2018-02-05 | 2018-09-07 | 浙江衡远新能源科技有限公司 | A kind of friction force checking device of soft-package battery module |
| CN109030267A (en) * | 2018-09-07 | 2018-12-18 | 长沙学院 | A kind of friction test device and its test method |
| CN211042551U (en) * | 2019-09-11 | 2020-07-17 | 安徽微威胶件集团有限公司 | Device for measuring maximum static friction force of parking wedge |
-
2019
- 2019-09-11 CN CN201910859838.9A patent/CN110567625A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001336997A (en) * | 2000-05-30 | 2001-12-07 | Shimadzu Corp | Friction force measuring device and friction force measuring method |
| JP2005351911A (en) * | 2005-09-09 | 2005-12-22 | Nsk Ltd | Device for measuring frictional force |
| CN203534808U (en) * | 2013-09-27 | 2014-04-09 | 中交公路长大桥建设国家工程研究中心有限公司 | Device for static and dynamic multifunctional test of supporting seat |
| CN104777094A (en) * | 2015-04-10 | 2015-07-15 | 清华大学 | Experimental device for testing rubber friction performance |
| CN205879426U (en) * | 2016-08-12 | 2017-01-11 | 刘逸丹 | Biggest stiction testing arrangement |
| CN207832367U (en) * | 2018-02-05 | 2018-09-07 | 浙江衡远新能源科技有限公司 | A kind of friction force checking device of soft-package battery module |
| CN109030267A (en) * | 2018-09-07 | 2018-12-18 | 长沙学院 | A kind of friction test device and its test method |
| CN211042551U (en) * | 2019-09-11 | 2020-07-17 | 安徽微威胶件集团有限公司 | Device for measuring maximum static friction force of parking wedge |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112666075A (en) * | 2020-12-23 | 2021-04-16 | 成都济通路桥科技有限公司 | Novel force measuring device and method for measuring friction coefficient of support in operation period |
| CN112666075B (en) * | 2020-12-23 | 2021-09-28 | 成都济通路桥科技有限公司 | Method for measuring friction coefficient between force measuring device and support in operation period |
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