CN110530789B - Friction coefficient detection device - Google Patents
Friction coefficient detection device Download PDFInfo
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- CN110530789B CN110530789B CN201910791023.1A CN201910791023A CN110530789B CN 110530789 B CN110530789 B CN 110530789B CN 201910791023 A CN201910791023 A CN 201910791023A CN 110530789 B CN110530789 B CN 110530789B
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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 relates to a friction coefficient detection device, which comprises a device frame, wherein a base part is connected to the device frame through a rotating connection structure, the rotating connection structure extends along the front-back direction through a rotating axis, a measuring rod is assembled on the base part in a guiding and moving mode along the radial direction of the rotating connection structure, a circulating rotating body in contact friction fit with a detected road surface is arranged at the bottom of the measuring rod and is driven by a rotating body driving mechanism, and a transverse force measuring sensor used for measuring the stress of the measuring rod when the circulating rotating body rotates relative to the ground is arranged on the device frame. The invention provides a friction coefficient detection device capable of obtaining a road surface friction coefficient.
Description
Technical Field
The invention relates to a friction coefficient detection device for measuring the friction coefficient of a road surface.
Background
With the development of transportation industry, the antiskid problem of road surfaces such as highways, urban roads, airport runways and the like has attracted general attention of relevant departments, and the factor for determining antiskid is the friction coefficient of the road surface, and the friction coefficient of the road surface needs to be measured in order to ensure the antiskid capability of the road surface.
The pendulum type instrument is a main device for measuring the friction coefficient at present, and is developed according to the basic principle that the potential energy loss of a pendulum is equal to the work done by a rubber sheet arranged at the tail end of a pendulum arm when the pendulum arm slides over a road surface and overcomes the friction of the road surface and the like, but the pendulum type instrument is invented by the original road and transport research institute (TRRL), the main patents of the pendulum type instrument are mastered in foreign hands, and in addition, the pendulum type instrument also has the technical problem that only the dynamic friction coefficient of the road surface can be measured but the static friction coefficient of the road surface cannot be measured.
Disclosure of Invention
The invention aims to provide a friction coefficient detection device capable of obtaining a road surface friction coefficient.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the utility model provides a coefficient of friction detection device, includes the device frame, is connected with the basic piece through the rotation connection structure that the axis of rotation extends along the fore-and-aft direction on the device frame, and the radial direction removal along rotating connection structure is equipped with the measuring stick on the basic piece, and the bottom of measuring stick is provided with be used for with surveyed road surface contact friction fit's circulating rotor, circulating rotor is driven by rotor actuating mechanism, is provided with on the device frame to be used for circulating rotor to measure when rotating relative ground measuring stick atress horizontal force cell sensor.
The two ends of the transverse force transducer are hinged with the measuring rod and the device frame through a hinge structure respectively, and a hinge axis of the hinge structure extends in the front-back direction.
One end of the transverse force measuring sensor is connected with the device frame, and the other end of the transverse force measuring sensor is abutted against the corresponding side face of the measuring rod.
The measuring rod comprises a main rod body and a rotor support arranged at the lower end of the main rod body and used for installing a circulating rotor, and the rotor support is connected with the main rod body through a universal joint or a joint bearing.
The rotating body support is rotatably provided with a left rotating wheel and a right rotating driving wheel, the circulating rotating body is a circulating belt wound on the left rotating wheel and the right rotating driving wheel, and the rotating body driving mechanism is in transmission connection with the corresponding rotating wheels to drive the circulating rotating body to rotate.
The lateral load cells are arranged horizontally.
The basic part is provided with two guide rods which are vertically arranged, and the measuring rod is provided with a guide plate which is sleeved with the two guide rods in a guide way and can realize the radial guide movement of the measuring rod along the rotary connecting structure.
And a powerful weight is arranged on the measuring rod.
The spring is arranged between the base part and the measuring rod in a propping mode, the base part is in threaded connection with a spring adjusting nut for adjusting the expansion amount of the spring, and a vertical force measuring sensor is arranged between the spring and the measuring rod.
The foundation member is provided with a guide groove extending along the radial direction of the rotating connecting structure, and rolling bearings in contact and rolling fit with the groove walls of the guide groove are arranged on two sides of the measuring rod.
The invention has the beneficial effects that: in use, the periphery of the circulating rotary body is made to contact with the road to be detectedThe road surface contacts, the rotor driving mechanism drives the circulating rotor to rotate, the transverse force transducer limits the measuring rod to swing, so that the whole friction coefficient detection device reaches a balance, FL 1 =fL 2 In the formula, F represents the measured value of the transverse load cell, L 1 Indicating the arm of force between the force point of the transverse force transducer and the axis of the rotary joint, L 2 F is the distance between the contact position of the endless rotating body and the road surface and the axis of the rotary joint, f is the friction between the endless rotating body and the road surface, F, L 1 And L 2 Are all known values, so f = FL 1 / L 2 Then, the friction coefficient μ of the road surface is calculated from the formula μ = f/N, where N represents the positive pressure of the measuring rod received by the contact position of the endless rotating body with the road surface, which is related to the self weight and the force received by the measuring rod, and is also an available data, so that the friction coefficient μ of the road surface can be calculated.
Drawings
FIG. 1 is a schematic structural view of embodiment 1 of the present invention;
FIG. 2 is a schematic view of the structure of the apparatus rack of FIG. 1;
FIG. 3 is a schematic view of the universal joint, rotor support, left rotor wheel, right rotor wheel and endless rotor of FIG. 1 in combination;
FIG. 4 is a right side view of FIG. 3;
FIG. 5 is a schematic structural view of embodiment 2 of the present invention;
FIG. 6 is a schematic view showing the arrangement of the measuring rod, the base member and the force weight according to example 3 of the present invention;
FIG. 7 is a schematic view showing the fitting of the measuring stick to the base member in embodiment 4 of the present invention;
fig. 8 is a schematic view of the combination of the measuring rod and the lateral load cell in embodiment 5 of the present invention.
Detailed Description
An embodiment 1 of a friction coefficient detecting device is shown in fig. 1 to 4: the device comprises a device frame 1, the device frame is shown in figure 2 and comprises a bottom plate 4 and a vertical plate 3 of a triangular structure, supporting legs 5 are arranged at the bottom of the bottom plate, and a vertically arranged mounting rod 10 is arranged at the right end of the bottom plate. A handle 16 is arranged on the top of the vertical plate.
The upper end of riser 3 is connected with the foundation through rotating connection structure, and the axis that rotates connection structure sets up along the fore-and-aft direction, and the rotation connection structure includes the mounting hole 26 that sets up the axis in the upper end of riser and extend along the fore-and-aft direction and wears the installation axle 17 of adorning in mounting hole 26 in this embodiment, and the foundation is including rotating the vertical rod 15 of cover connection on installation axle 17. The lower end of the vertical rod 15 is provided with a connecting plate 14, and two vertically arranged guide rods 13 are arranged on the connecting plate 14. The friction coefficient detection device further comprises a measuring rod 2, a guide plate which is sleeved with the two guide rods in a guide mode to realize the radial guide movement of the measuring rod along the rotary connection structure is arranged on the measuring rod 2, and a linear bearing 30 is arranged between each guide plate 24 and the corresponding guide rod 13.
Measuring stick 2 includes the mobile jib body and connects in the rotor support 29 of mobile jib body lower extreme through universal joint 9, rotate on the rotor support 29 and be equipped with left-hand rotary wheel 6 and right-hand rotary wheel 8, left-hand rotary wheel 6, around having circulating rotor 7 on the right-hand rotary wheel 8, in this embodiment, circulating rotor 7 is a circulation area, left-hand rotary wheel 6 is driven by rotor actuating mechanism, rotor actuating mechanism includes gear motor 28, gear motor's power take off end is connected with the transmission of left-hand rotary wheel 6, thereby realize driving circulating rotor and rotate. A spring 20, a force transmission ball 21 and a vertical force measuring sensor 22 are sequentially arranged between the base part and a guide plate 24 of the measuring rod, a spring adjusting nut 19 for adjusting the expansion amount of the spring is connected to the vertical rod of the base part through threads, and the lower end of the vertical force measuring sensor 22 is connected with the guide plate 24.
The device frame is provided with a transverse force transducer 12 for measuring the stress of the measuring rod when the circulating rotating body 7 rotates relative to the ground 25, the transverse force transducer is horizontally arranged in the embodiment, the left end of the transverse force transducer is hinged and connected with the measuring rod through a hinge structure 11, the right end of the transverse force transducer is hinged and connected with the mounting rod 10 on the bottom plate through the hinge structure 11, the hinge structure comprises a hinge shaft and a hinge hole, the axis of the hinge shaft extends along the front-back direction, the hinge shaft and the hinge hole are respectively arranged on the two components, for example, for the hinge structure of the right end, the hinge shaft is arranged on the transverse force transducer 12, and the hinge hole 27 is arranged on the mounting rod 10. The transverse load cell in this embodiment is a pull pressure sensor.
When the device is used, the device frame 1 is placed on a road surface, the bottom of the circulating rotating body 7 is in contact with the road surface 25, the rotating body driving mechanism drives the circulating rotating body to rotate anticlockwise, friction is generated between the circulating rotating body 7 and the road surface, the transverse force transducer limits the swinging of the measuring rod 2, and at the moment, the whole friction coefficient detection device reaches a balance, namely FL 1 =fL 2 In the formula, F represents the measured value of the transverse load cell, L 1 Indicating the moment arm between the force point of the transverse force sensor and the axis of the rotary joint, i.e. the distance between the transverse force sensor and the axis of the rotary joint, L 2 F is the distance between the contact position of the endless rotating body and the road surface and the axis of the rotary joint, f is the friction between the endless rotating body and the road surface, F, L 1 And L 2 Are all known values, so f = FL 1 / L 2 Then, according to a formula μ = f/N, a friction coefficient μ value of the road surface can be calculated, where N represents a positive pressure of the measuring rod on a contact position of the cyclorotor and the road surface, and in this embodiment, N = a dead weight of the measuring rod + an acting force of the spring on the measuring rod, that is, a measured value of the vertical force transducer, in order to compensate for the dead weight of the measuring rod during the spring, the measuring rod is prevented from being too light to ensure reliable contact between the cyclorotor and the road surface. The invention can also detect the static friction coefficient of the road surface, the circulating rotating body has a static friction relation with the road surface in the process from static to rotating, and the static friction coefficient of the road surface can be calculated through the reading of the transverse force transducer in the process.
Through the setting of universal joint for rotor support relative measuring stick can the fore-and-aft direction and left right direction swing, no matter there is the slope in road surface fore-and-aft direction or there is the ramp in left right direction like this, all can guarantee the reliable contact of circulation rotor and road surface. In other embodiments of the invention, the universal joint may also be replaced by a spherical plain bearing; when the road surface is a flat road surface, the universal joint can be omitted, and the rotating body bracket can be fixed on the main rod body; the circulating rotating body can also be a single rotating wheel structure; the transverse force cell and the vertical force cell can also be spoke type force cells,
an embodiment 2 of a friction coefficient detecting apparatus is shown in fig. 5: embodiment 2 is different from embodiment 1 in that, in order to ensure the contact positive pressure between the circulating rotating body 7 and the road surface 25, a spring force application structure is not used, but a force weight 32 is placed on the guide plate 24, the force weight is in a ring structure, the force weight is sleeved on the upper end of the measuring rod, and the weight of the force weight with the positive pressure N = at the contact position of the circulating rotating body and the road surface + the self weight of the measuring rod at this time.
An embodiment 3 of a friction coefficient detecting apparatus is shown in fig. 6: example 3 differs from example 2 in that: the base part comprises a rotating connecting sleeve 33 and two guide rods 19 directly fixed on the rotating connecting sleeve 33, the rotating connecting sleeve 33 is sleeved on a mounting shaft on the device frame in a rotating mode, a guide plate 24 is arranged at the top end of the measuring rod 2, and the guide plate 24 is matched with the guide rods 19 in a guiding mode through linear bearings. The lower end of the measuring rod is provided with a bearing plate 34, and the force weight 32 is sleeved on the periphery of the measuring rod and is arranged on the bearing plate 34.
An embodiment 4 of a friction coefficient detecting apparatus is shown in fig. 7: example 4 differs from example 3 in that: the back side of the base part 36 is provided with a mounting hole 35 for rotatably sleeving a mounting shaft on the device frame, the front side of the base part is provided with a guide groove 37 extending along the radial direction of the mounting hole, and two sides of the measuring rod are provided with rolling bearings 38 in contact and rolling fit with groove walls 39 of the guide groove, so that the guiding movement of the measuring rod relative to the base part is realized.
An embodiment 5 of a friction coefficient detecting apparatus is shown in fig. 8: embodiment 5 is different from embodiment 4 in that the transverse load cell 12 is a pressure-type load cell capable of only measuring a pressure, one end of the transverse load cell is fixed on a vertical plate (not shown) of the apparatus frame, the measuring rod 2 is provided with a pushing portion 41, a force measuring end 42 of the pressure-type load cell is pushed against the pushing portion 41 of the measuring rod, and the pushing portion in this embodiment is a ball head structure. The end of the measuring rod, which is far away from the transverse force transducer, is provided with a limiting rod 40, the limiting rod is fixed on the device frame, and the limiting rod is used for limiting the measuring rod to swing towards the direction far away from the transverse force transducer, so that the transverse force transducer can be prevented from being injured by a crashing object when the measuring rod swings back to a large extent in transportation or other environments. The transverse force transducer adopts a compression type force transducer, so that the transverse force transducer can be directly fixed on the device frame, and the pressure influence of the transverse force transducer on the measuring rod is avoided.
Claims (9)
1. The utility model provides a coefficient of friction detection device, includes the device frame, its characterized in that: the device frame is connected with a base part through a rotating connecting structure with a rotating axis extending in the front-back direction, the base part is assembled with a measuring rod along the radial guide movement of the rotating connecting structure, the bottom of the measuring rod is provided with a circulating rotating body in contact friction fit with a measured road surface, the circulating rotating body is driven by a rotating body driving mechanism, the device frame is provided with a transverse force measuring sensor used for measuring the stress of the measuring rod when the circulating rotating body rotates relative to the ground, the device frame comprises a bottom plate and a vertical plate of a triangular structure, the bottom of the bottom plate is provided with a supporting leg in contact with the ground, the bottom of the supporting leg is of a top structure with a large top and a small bottom, the measuring rod comprises a main rod body and a rotating body support arranged at the lower end of the main rod body and used for installing the circulating rotating body, and the rotating body support is connected with the main rod body through a universal joint or a joint bearing.
2. The friction coefficient detecting device according to claim 1, characterized in that: two ends of the transverse force transducer are respectively hinged with the measuring rod and the device frame through a hinge structure, and a hinge axis of the hinge structure extends along the front-back direction.
3. The friction coefficient detecting device according to claim 1, characterized in that: the transverse force measuring sensor is a pressed force measuring sensor, one end of the transverse force measuring sensor is connected with the device frame, and the other end of the transverse force measuring sensor abuts against the corresponding side face of the measuring rod.
4. The friction coefficient detecting device according to claim 1, characterized in that: the rotating body support is rotatably provided with a left rotating wheel and a right rotating driving wheel, the circulating rotating body is a circulating belt wound on the left rotating wheel and the right rotating driving wheel, and the rotating body driving mechanism is in transmission connection with the corresponding rotating wheels to drive the circulating rotating body to rotate.
5. The friction coefficient detecting device according to claim 2 or 3, characterized in that: the lateral load cells are arranged horizontally.
6. The friction coefficient detecting device according to any one of claims 1 to 4, characterized in that: the basic part is provided with two guide rods which are vertically arranged, and the measuring rod is provided with a guide plate which is sleeved with the two guide rods in a guide way and can realize the radial guide movement of the measuring rod along the rotary connecting structure.
7. The friction coefficient detecting device according to claim 6, characterized in that: the measuring rod is provided with powerful weights.
8. The friction coefficient detecting device according to claim 6, characterized in that: the spring is arranged between the base part and the measuring rod in a propping mode, the base part is in threaded connection with a spring adjusting nut for adjusting the expansion amount of the spring, and a vertical force measuring sensor is arranged between the spring and the measuring rod.
9. The friction coefficient detecting device according to claim 1, characterized in that: the foundation member is provided with a guide groove extending along the radial direction of the rotating connection structure, and two sides of the measuring rod are provided with rolling bearings in contact rolling fit with the groove walls of the guide groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910791023.1A CN110530789B (en) | 2019-08-26 | 2019-08-26 | Friction coefficient detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910791023.1A CN110530789B (en) | 2019-08-26 | 2019-08-26 | Friction coefficient detection device |
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| CN110530789A CN110530789A (en) | 2019-12-03 |
| CN110530789B true CN110530789B (en) | 2022-09-20 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112198111A (en) * | 2020-10-12 | 2021-01-08 | 大连理工大学 | Reciprocating type rotating connection structure friction coefficient measuring device |
| CN113340804A (en) * | 2021-06-07 | 2021-09-03 | 北京理工大学 | Test device for accurately measuring static friction coefficient |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3505501B2 (en) * | 2000-10-19 | 2004-03-08 | 株式会社大和製作所 | Device for measuring sliding friction coefficient of automobile road surface |
| NL1017303C2 (en) * | 2001-02-07 | 2002-08-08 | Ten Cate Nicolon B V | Device for measuring the static and / or dynamic coefficient of friction of an artificial grass surface. |
| JP2005083783A (en) * | 2003-09-05 | 2005-03-31 | Nippo Corporation:Kk | Measuring instrument of coefficient of dynamic friction |
| JP2007333637A (en) * | 2006-06-16 | 2007-12-27 | East Japan Railway Co | Portable rail friction coefficient measuring unit |
| DE102007053256B3 (en) * | 2007-11-08 | 2009-07-09 | Continental Automotive Gmbh | Method and device for determining a coefficient of friction |
| CN101419724B (en) * | 2008-12-09 | 2010-09-15 | 东南大学 | Three-dimensional pavement generating method applying to virtual prototype system |
| CN102749281A (en) * | 2012-07-03 | 2012-10-24 | 长安大学 | Braking type large-scale friction coefficient measuring apparatus |
| CN103196823B (en) * | 2013-03-13 | 2014-12-10 | 哈尔滨工业大学 | Device and method capable of directly measuring road surface sliding friction coefficient |
| CN203720064U (en) * | 2014-02-14 | 2014-07-16 | 长安大学 | Pavement friction coefficient tester |
| US9233692B2 (en) * | 2014-03-10 | 2016-01-12 | GM Global Technology Operations LLC | Method to control a vehicle path during autonomous braking |
| CN104749096B (en) * | 2015-03-23 | 2017-07-28 | 同济大学 | A kind of mechanical friction and adhesion coefficient determine device |
| CN107941527A (en) * | 2017-12-26 | 2018-04-20 | 郑州拽亘电子科技有限公司 | A kind of tablet anti-force type automobile brake verifying attachment |
| CN211402091U (en) * | 2019-08-26 | 2020-09-01 | 河南牛帕力学工程研究院 | Friction coefficient detection device |
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