CN219391765U - Rubber friction testing device - Google Patents
Rubber friction testing device Download PDFInfo
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- CN219391765U CN219391765U CN202220914018.2U CN202220914018U CN219391765U CN 219391765 U CN219391765 U CN 219391765U CN 202220914018 U CN202220914018 U CN 202220914018U CN 219391765 U CN219391765 U CN 219391765U
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- 238000012360 testing method Methods 0.000 title claims abstract description 59
- 238000010438 heat treatment Methods 0.000 claims abstract description 26
- 230000005855 radiation Effects 0.000 claims description 8
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 6
- 229910052593 corundum Inorganic materials 0.000 claims description 3
- 239000010431 corundum Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims 2
- 239000011810 insulating material Substances 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 60
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 30
- 239000007921 spray Substances 0.000 abstract description 19
- 239000007788 liquid Substances 0.000 abstract description 15
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 15
- 238000000034 method Methods 0.000 abstract description 13
- 230000008569 process Effects 0.000 abstract description 12
- 230000007246 mechanism Effects 0.000 abstract description 7
- 238000004088 simulation Methods 0.000 abstract description 5
- 229910000838 Al alloy Inorganic materials 0.000 abstract description 4
- 239000002609 medium Substances 0.000 description 9
- 238000001514 detection method Methods 0.000 description 7
- 230000008878 coupling Effects 0.000 description 6
- 238000010168 coupling process Methods 0.000 description 6
- 238000005859 coupling reaction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000033001 locomotion Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 230000000875 corresponding effect Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000012736 aqueous medium Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
Classifications
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- G—PHYSICS
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
- G01M17/02—Tyres
- G01M17/021—Tyre supporting devices, e.g. chucks
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Automation & Control Theory (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Tires In General (AREA)
Abstract
The utility model belongs to the technical field of rubber friction test equipment, and relates to a rubber friction test device, which consists of a base, a temperature control unit, a pavement simulation unit, a power driving unit and a central pipeline, wherein the temperature control unit comprises a liquid nitrogen tank and a heating pipe, the surface temperature of a friction disk is changed to simulate the friction process of a tire on a pavement at different temperatures, the pavement simulation unit comprises the friction disk made of aluminum alloy, a friction belt with the size specification matched with the friction disk is placed on the upper surface, the power driving unit comprises a motor, a circuit of the liquid nitrogen conveying pipe and the heating pipe is laid in the central pipeline, a rubber wheel test mechanism and a medium control unit consisting of a rubber wheel, a six-component force sensor, an angle adjusting device, a pressurizing device and a driving motor are loaded above the friction disk before the test, the medium control unit comprises a spray head and a water tank, the spray head is provided with a switch, and the spray head is aligned with the upper surface of the friction disk to spray different amounts of water to simulate different water film thickness conditions.
Description
Technical field:
the utility model belongs to the technical field of rubber friction test equipment, and particularly relates to a rubber friction test device which can test friction of rubber under a complex road surface.
The background technology is as follows:
the tire is a ring-shaped elastic rubber product which is assembled on an automobile and rolls in a grounding way, and is used as the only part of the vehicle which is contacted with the road surface during the running process, and the advantages and disadvantages of the friction performance directly influence the running safety.
Main raw materials for manufacturing tires: rubber has the characteristics of viscoelasticity, nonlinearity, temperature sensitivity and the like, and has a friction mechanism different from a metal material and typical thermal coupling characteristics.
Due to the thermal coupling characteristics of rubber, road surface temperature has a non-negligible effect on the friction properties of tire rubber: under the influence of different climates, day-night temperature differences and other factors, the road surface temperature is quite different from the environment temperature, and especially in summer, the road surface temperature is much higher than the environment temperature due to the fact that the road surface absorbs the radiation of sunlight.
In the running process of the vehicle, the road surface medium also has important influence on the friction of rubber, and in a wet and slippery state, the ground gripping performance of the tire is reduced, so that the slipping phenomenon is easy to occur, and the running safety of the vehicle is influenced. In addition, the difference in road surface type also has an important influence on the friction of rubber. Meanwhile, water films with different thicknesses on the road surface have different influences on the friction performance of rubber.
The rubber friction performance detection device in the prior art is often used for testing mutual friction between a tire and a grinding wheel or a grinding surface at normal temperature or set environmental temperature, neglecting the influence of the pavement temperature on the friction performance, and less relates to the research of the water film thickness on the friction performance.
The high-speed ice friction testing device for the tire rubber disclosed in Chinese patent 201711151068.X is provided with a detection box, wherein a transmission shaft is longitudinally arranged in the detection box through a thrust ball bearing, a power source is arranged below the transmission shaft, an output shaft of the power source is connected with the transmission shaft, the upper end of the transmission shaft is fixedly connected with a turntable, an ice mounting groove is formed in the upper side of the turntable, a double-acting cylinder is arranged on the mounting box above the turntable, a piston rod of the double-acting cylinder is connected with a pressurizing shaft through a mechanical sensor, and two ends of the pressurizing shaft are respectively connected with a rubber disc connecting seat through bearings; the friction test device is of a pin-disc type structure, and is free from influence of road surface temperature on rubber friction performance, and can only perform ice friction test.
The automobile tire performance detection device disclosed in China patent 201810823004.8 comprises a U-shaped frame, a first spring, a rough road surface, a high-temperature road surface, a low-temperature road surface, a first sliding rail, a first sliding block, a screw rod, a second sliding rail, a second sliding block, a second spring, a transverse plate, a mounting frame, a mounting block, a servo motor, a first belt pulley, a rotating shaft, a second belt pulley, a flat belt, an automobile tire body, a supporting rod and a top plate, wherein the bottom in the U-shaped frame is uniformly and alternately connected with the first spring from front to back and from left to right, the top end of the first spring at the front side is connected with the rough road surface, the top end of the first spring in the middle is connected with the high-temperature road surface, the top end of the first spring at the rear side is connected with the low-temperature road surface, the left side and right sides of the top of the U-shaped frame are respectively connected with the first sliding rail, the first sliding block is arranged on the first sliding rail, the top of the first sliding rail is uniformly provided with threaded holes from front to back, the first slide block is also provided with a threaded hole, a screw is arranged in the threaded hole on the first slide block, the top of the first slide block is connected with a second slide rail, a second slide block is arranged on the second slide rail, a second spring is connected between the top left side of the second slide block on the left side and the top right side of the second slide block on the right side and the top in the second slide rail on the corresponding side, a transverse plate is connected between the right side of the second slide block on the left side and the left side of the second slide block on the right side, a mounting frame is connected between the two transverse plates, the top of the mounting frame is embedded and provided with a mounting block, the rear side of the mounting block is provided with a servo motor, an output shaft of the servo motor penetrates through the mounting block and is connected with a first belt pulley, the lower part of the mounting frame is rotatably connected with a rotating shaft, the rotating shaft on the rear side of the mounting frame is connected with a second belt pulley, a flat belt is wound between the second belt pulley and the first belt pulley, the rotating shaft at the rear side of the second belt pulley is connected with an automobile tire body, the right side of the top of the second sliding block at the left side and the left side of the top of the second sliding block at the right side are both connected with a supporting rod, and a top plate is connected between the top ends of the two supporting rods; the crawler-type structure is adopted, the influence of temperature on the friction performance of rubber is not considered, and the pavement with the medium cannot be tested.
The Chinese patent 201710632278.4 discloses a rubber friction experiment machine, which comprises a base, a rubber fixing device, a rubber movement amplitude detection device, a rubber pressure loading device, a rubber friction loading device and a signal acquisition processing device, wherein the rubber fixing device is fixed on the base, the rubber movement amplitude detection device is directly or indirectly fixed on the base, the rubber pressure loading device and the rubber friction loading device are fixed on a shell, the shell is fixed on the base, and the signal acquisition processing device is connected with a control circuit of the rubber fixing device, the rubber movement amplitude detection device, the rubber pressure loading device and the rubber friction loading device and is used for acquiring the heating temperature of rubber, the rubber movement amplitude, the pressure applied by rubber and the friction applied by rubber; the reciprocating friction is adopted, the influence of the road surface temperature on the rubber friction performance is not considered, and the rubber friction performance under the water film condition cannot be tested.
In summary, there is no rubber friction testing device in the prior art that can comprehensively consider factors such as road surface temperature, water film thickness, road surface type and the like. Therefore, the rubber friction measuring device is developed and designed, a test platform under complex road conditions and environmental conditions is provided, friction processes of different road surface temperatures, water film thicknesses and road surface types are simulated, and the friction coefficient of the tire rubber is tested.
The utility model comprises the following steps:
the utility model aims to overcome the defects of the prior art, and seeks to design a rubber friction testing device, provide a testing platform under complex road conditions and environmental conditions and test the influence of road surface temperature, water film thickness and road surface type on friction performance.
The utility model relates to a main body structure of a rubber friction testing device, which comprises a motor, a friction disc and a central pipeline; the motor is connected with the friction disc, and the center of the friction disc is penetrated with a central pipeline which is connected with the friction disc.
The driving end of the motor is connected with a coupling after 90-degree steering switching of the bearing, the motor is further connected with a friction disc through the coupling, the motor is arranged on a support, the support is arranged on a base, the motor is connected with the bearing, the bottom end of the bearing is connected with a slip ring arranged on the base, the slip ring is arranged below the support, the top end of the bearing is connected with the coupling, and the coupling is connected with a plurality of circular tubes arranged at equal intervals on the bottom of the friction disc; the top of central pipeline is connected with the frame that sets up on the base and stretches out the frame, and the bottom of central pipeline is connected with the friction disc through the hose, and the junction of central pipeline and hose is provided with the gas sliding ring, still is provided with thermometer and heating pipe on the central pipeline, and the thermometer is located the top of friction disc, and the heating pipe is located the below of friction disc.
The circumference of the upper surface of the friction disk is provided with a fence, the upper surface is provided with a friction belt, and the side wall is provided with a vent hole.
The utility model relates to a testing principle of a rubber friction testing device, which comprises the following steps: the temperature test range of the upper surface of the friction disk is-40-80 ℃, and the radiation heating control of a liquid nitrogen cooling or heating pipe is provided by a liquid nitrogen pipeline; the spray header sprays corresponding amount of water according to the upper surface area of the friction disk to form a water film with set thickness; friction belts made of different materials and simulating different road surfaces are respectively arranged on the friction disc; during the test, the motor drives the friction disc to rotate, and the fixed rubber wheel rubs with the upper surface of rotatory friction disc each other, can study road surface temperature, water film thickness and different road to the influence of friction performance.
Compared with the prior art, the utility model consists of a base, a temperature control unit, a pavement simulation unit, a power driving unit and a central pipeline, wherein the temperature control unit comprises a liquid nitrogen tank and a heating pipe, the surface temperature of a friction disk is changed to simulate the friction process of a tire on a pavement at different temperatures, the pavement simulation unit comprises a friction disk made of aluminum alloy, the interior of the friction disk is of a cavity structure, a friction belt with the size specification matched with the friction disk is placed on the upper surface of the pavement simulation unit, the friction disk is tightly attached to the friction disk, the power driving unit comprises a motor, the circuit of the liquid nitrogen conveying pipe and the heating pipe is laid in the central pipeline, before testing, a rubber wheel testing mechanism and a medium control unit consisting of a rubber wheel, a six-component sensor, an angle adjusting device, a pressurizing device and a driving motor are loaded above the friction disk, the medium control unit comprises a spray head and a water tank, a switch is sprayed on the upper surface of the friction disk, the spray head sprays different amounts of water to simulate the friction process of the tire under the different water film thickness conditions, and when the motor is used for testing, the spray head rotates to the surface of the friction disk under the driving of the motor to form a water film with set thickness, and the current load and the water film with six-component is measured under the current load angle parameters; the friction disc of the annular structure reduces the dead weight, the slip ring ensures the stability of the testing process, the friction disc is connected with the coupler through a plurality of circular tubes, the maintenance is convenient, the influence of the road surface temperature, the water film thickness and the road surface type on the friction performance can be tested, the testing result is accurate, the friction characteristics and consistency of different carbon black parts or different rubber types on dry and wet road surfaces are researched, the friction coefficient is established for different parameter characterization, and the basis is provided for improving the friction performance of the tire.
Description of the drawings:
fig. 1 is a schematic diagram of the principle of the main structure of the present utility model.
Fig. 2 is a schematic view of the usage state of the present utility model.
Fig. 3 is a schematic structural view of the friction plate according to the present utility model.
Fig. 4 is a schematic structural view of an air slip ring according to the present utility model.
Fig. 5 is a schematic structural view of a thermometer according to the present utility model.
Fig. 6 is a schematic structural view of a water tank according to the present utility model.
Fig. 7 is a schematic structural diagram of a rubber wheel testing mechanism according to the present utility model.
Fig. 8 is a perspective view of the rubber wheel testing mechanism according to the present utility model.
The specific embodiment is as follows:
the utility model is further illustrated by the following examples in conjunction with the accompanying drawings.
Example 1:
the main body structure of the rubber friction testing device comprises a base 1, a frame 2, a bracket 3, a motor 4, a bearing 5, a slip ring 6, a coupler 7, a friction disk 8, a circular pipe 9, a central pipeline 10, a hose 11, an air slip ring 12, a thermometer 13, a heating pipe 14, a fence 15, a friction belt 16 and a vent hole 17; the base 1 is provided with an outer frame 2 and an inner bracket 3, the bracket 3 is provided with a motor 4, the motor 4 is connected with a bearing 5, the bottom end of the bearing 5 is connected with a slip ring 6 arranged on the base 1 below the bracket 3, the top end of the bearing 5 is connected with a coupler 7, the coupler 7 is connected with 12 circular pipes 9 arranged at equal intervals on the bottom of a friction disk 8 of an inner hollow circular structure, a central pipeline 10 is arranged in a central circular hole of the friction disk 8, the top end of the central pipeline 10 is connected with the frame 2 and extends out of the frame 2, the bottom end of the central pipeline 10 is connected with the friction disk 8 through a hose 11, an air slip ring 12 is arranged at the joint of the central pipeline 10 and the hose 11, a thermometer 13 and a heating pipe 14 are arranged on the central pipeline 10, the thermometer 13 is positioned above the friction disk 8, and the heating pipe 14 is positioned below the friction disk 8; the circumference of the upper surface of the friction disk 8 is provided with a fence 15, the upper surface is provided with a friction belt 16, and the side wall is provided with a vent hole 17.
The base 1 according to the present embodiment is placed on a table or the ground; the motor 4 is used for controlling the rotating speed of the friction disk 8; the slip ring 6 is used for supporting the bearing 5, so that the friction disk 8 is kept in a stable horizontal state in the test process; the coupler 7 is positioned below the circle center of the friction disc 8; the friction disk 8 is made of aluminum alloy with the surface thickness of 3mm, the radius of the friction disk 8 is 30cm, the annular width is 8cm, and the height of the hollow part is 7mm; the round tubes 9 are made of aluminum alloy, gaskets made of rubber are arranged between the round tubes 9 and the friction discs 8, and are fixed by screws to improve the stability of the friction discs 8 and reduce the heat transferred by the friction discs 8 to the motor 4, and the included angle between two adjacent round tubes 9 is 30 degrees; the outer side of the hose 11 is wrapped with a heat insulation material, has a warm keeping effect, and one end of the hose is fixed at the edge of the lower surface of the friction disc 8; the stator of the air slip ring 12 is fixed on the central pipeline 10, the rotor is connected with the friction disk 8 through a hose 11, and the rotor rotates together with the friction disk 8 during test; the thermometer 13 is a radiation type thermometer, and the measuring range is-40-80 ℃ so as to measure the temperature of the upper surface of the friction disk 8 right below the thermometer; the heating pipes 14 are infrared radiation heating pipes, 3 heating pipes are arranged side by side, the adjacent distance is 3cm, each power is 1500W, heat is transferred to the friction disc 8 in a heat radiation mode, and the circuit of the heating pipes 14 penetrates through the inside of the central pipeline 10; the rail 15 is arc-shaped and has a height of 2-5cm, and is closed inwards to prevent the medium on the rail from throwing out the friction disk 8 under the action of centrifugal force when the friction disk 8 rotates; the friction belt 16 comprises a zirconia corundum abrasive belt with the granularity of 36 # and has high strength, no wrinkling phenomenon occurs in the test process, and the size is matched with the upper surface of the friction disk 8 and is tightly attached to the friction disk; the bleed holes 17 were 1mm in diameter for venting air and closed during the test.
Example 2:
when the rubber friction testing device is used, the water tank 18 is arranged at the top of the frame 2, the spray header 19 is arranged at the outlet of the water tank 18, and the spray header 19 is opposite to the upper surface of the friction disc 8 and is connected with the water pump 20 arranged in the water tank 18; the rubber wheel testing mechanism 21 is arranged above the friction disc 8, the rubber wheel testing mechanism 21 consists of a rubber wheel 211, a six-component force sensor 212, an angle adjusting device 213, a pressurizing device 214 and a driving motor 215, the six-component force sensor 212 is arranged on a coaxial area of the rubber wheel 211, the angle adjusting device 213 is used for adjusting the load and the slip angle of the rubber wheel 211, and the angle adjusting device 213 and the pressurizing device 214 are driven by the driving motor 215; the liquid nitrogen conveying pipe 22 is connected with the air slip ring 12 through the central pipeline 10, liquid nitrogen reaches the air slip ring 12 through the liquid nitrogen conveying pipe 22, then enters the cavity of the friction disk 8 through the hose 11 to cool the friction disk 8, and the outer side of the liquid nitrogen conveying pipe 22 is wrapped with a heat insulation material with a heat insulation effect, so that temperature loss in the liquid nitrogen conveying process is avoided; the thermometer 13 is connected with a computer through a signal collector;
the running temperature of the friction disk 8 is-40-80 ℃, and the influence of the slightly moist road surface on the friction coefficient at different temperatures can be studied by condensing water vapor in the air on the friction disk 8 to form frost below 0 ℃ through the radiation heating control of the liquid nitrogen cooling or heating pipe 14 provided by the liquid nitrogen conveying pipe 22;
the water is sprayed on the upper surface of the friction disc 8 through the spray header 19, and the water is frozen under the low-temperature condition, so that the influence of the frozen pavement on the friction coefficient can be simulated;
according to the area of the friction disk 8, water with corresponding volume is sprayed through the spray header 19, a water film with set thickness is formed on the friction disk 8, and the influence of water films with different thicknesses on the friction performance can be studied;
when a test is carried out under the low-temperature drying condition, a dehumidifier is additionally arranged in a test space so as to prevent the condensation of water vapor in air from influencing the test effect;
in the test process, a temperature signal of the thermometer 13 is transmitted to a computer through a signal collector, and the computer controls the input quantity of liquid nitrogen or adjusts the power of the heating pipe 14 according to the temperature signal so as to achieve the effect of automatic temperature control;
test results: the friction force of the rubber wheel 211 is calculated by the data of the six-component sensor 212.
The shape of the water tank 18 that this embodiment relates to includes funnel-shaped, cylindrical and rectangle, and the material is plastics, has printed the scale mark, and when setting for the medium in talcum powder or other in the water tank 18, also can add the medium case in addition, add the agitator, can research different medium and to frictional properties's influence, spray header 19 can use atomizing nozzle to replace to research slightly moist road surface to frictional coefficient's influence, water tank 18 and spray header 19 lug connection or pipe connection, water pump 20 can real-time control water input.
Example 3:
when the rubber friction testing device is used, liquid nitrogen is input into a cavity of the friction disc 8, the temperature of the upper surface of the friction disc 8 is measured 13 through a thermometer, when the temperature reaches-10 ℃, the motor 4 is started, the rotating speed of the friction disc 8 is controlled through the motor 4, the set pressure is input for the rubber wheel 211, the angle is adjusted, and the friction force of the rubber wheel 211 on a dry road surface is obtained through the six-component sensor 212;
and water capable of forming a water film with the thickness of 1mm is sprayed in through the spray header 19, after the water freezes on the upper surface of the friction disk 8, the motor 4 is started, the rotating speed of the friction disk 8 is controlled through the motor 4, the set pressure is input for the rubber wheel 211, the angle is adjusted, and the friction force of the rubber wheel 211 on the ice surface is obtained through the six-component force sensor 212.
Example 4:
when the rubber friction testing device is used, an annular zirconia corundum abrasive belt with the granularity of 36 # is arranged on the surface of the friction disc 8, the power of the heating pipe 14 is regulated, the upper surface temperature of the friction disc 8 is measured through the thermometer 13, water capable of forming a water film with the thickness of 2mm is sprayed through the spray header 19 when the temperature reaches 40 ℃, the motor 4 is started, the rotating speed of the friction disc 8 is controlled through the motor 4, the set pressure is input for the rubber wheel 211, the angle is adjusted, the water slip test is carried out under the condition that the road surface temperature is 40 ℃, and the friction force of the rubber wheel 211 is obtained through the six-component sensor 212.
Example 5:
the procedure for testing and verifying a water slide model of friction coefficient caused by water film bearing of the water wedge model of example 4 was as follows:
when the rubber wheel 211 moves on the dry road surface, the length of the ground bearing rubber wheel 211 is L,
under waterslide conditions, the aqueous medium provides a load bearing capacity to the rubber wheel 211, the length of the ground bearing rubber wheel 211 is reduced by x, which is L-x, at which time, according to what? The length of the aqueous medium carrying rubber wheel 211 is also x,
water skid travel distance L-x=v w X t, wherein t is slipBetween v w For the slip speed of the rubber wheel 211 under waterslide conditions,
dry travel distance l=v d X t, where v d To dry the slip speed of the under-road glue wheel 211,
coefficient of friction mu under waterslide conditions w Coefficient of friction with dry road surface mu d The ratio is equal to the ratio of friction under water slip conditions to dry road surface, and is positively correlated to the ratio of the length of the carrier rubber wheel 211, namely:then: />Thereby: />Obtaining a water slip model of a friction coefficient caused by water film bearing: />Wherein a is a parameter, and the slip velocity v of the dry road surface and the wet road surface w And v d All can be controlled, and the friction coefficient mu under the water sliding condition w Coefficient of friction with dry road surface mu d All can be measured, so the water slide model with the friction coefficient can be tested and corrected by a rubber friction testing device.
Example 6:
the process of testing and verifying the water skid model of the friction coefficient caused by the viscous shear in the limit of the departure of the rubber wheel 211 from the road surface by the rubber friction testing device according to the present embodiment is as follows:
when the object is immersed in viscous fluid, a layer of fluid is attached to the surface; when in motion, a certain speed gradient exists between the flow layers near the surface of the object; the viscous resistance of the object is caused by the internal friction between the fluid layers near the surface of the object, when the rubber wheel 211 is completely separated from the road surface due to the bearing of the water film, the viscosity of the fluid has great influence on the friction coefficient, and the friction coefficient is irrelevant to the road surface and is caused by viscous shearing;
the viscous shear stress τ is described by newton's law of viscosity: τ=ηv/h, where η is the viscosity of the medium, v is the slip velocity, h is the film thickness;
viscous friction coefficient μ=f shear /F z Wherein F is shear F is the total shear stress at the contact area Z Is the pressure applied to the tire in the vertical direction;
in the case of a constant unit area, the viscous shear stress τ=f shear /A nom Pressure p nom ＝F z /A nom Wherein A is nom Is the nominal contact area;
available on the sum, μ=f shear /F z ＝τA nom /F z ＝τ/P nom ＝ηv/hP nom ；
Since friction does not act on the whole area, a relative contact area coefficient κ is introduced, so that the friction coefficient μ' =κηv/P due to viscous shear nom ·1/h；
The water skid model for explaining the friction coefficient can be tested and verified by a rubber friction testing device.
Example 7:
the present example relates to a rubber friction test apparatus for testing and verifying the waterslide model μ' =κ·ηv/P of the friction coefficient caused by the viscous shear of example 5 nom 1/h, where the viscosity η of water is known and is 0.656×10 at 40 ℃ -3 Pa.S, the thickness h of the water film is controlled by the spraying amount of the spray header 19, the pressure P per unit area nom The sliding speed v is controlled by the pressurizing device 214, and is a known controllable parameter by the motor 4, so that the friction coefficient is measurable, and a water sliding model indicating the friction coefficient can be tested and verified by a rubber friction testing device.
Claims (5)
1. The rubber friction testing device is characterized in that the main structure comprises a friction disc connected with a motor and a central pipeline penetrating through the center of the friction disc, a driving end of the motor is connected with a coupler after 90-degree steering switching of a bearing, the motor is further connected with the friction disc through the coupler, the motor is arranged on a support, the support is arranged on a base, the motor is connected with the bearing, the bottom end of the bearing is connected with a slip ring arranged on the base, the slip ring is arranged below the support, the top end of the bearing is connected with the coupler, and the coupler is connected with a plurality of circular tubes arranged at equal intervals on the bottom of the friction disc; the top of central pipeline is connected with the frame that sets up on the base and stretches out the frame, and the bottom of central pipeline is connected with the friction disc through the hose, and the junction of central pipeline and hose is provided with the gas sliding ring, still is provided with thermometer and heating pipe on the central pipeline, and the thermometer is located the top of friction disc, and the heating pipe is located the below of friction disc, is provided with the rail on the upper surface circumference of friction disc, is provided with the friction band on the upper surface, and the bleed hole has been seted up to the lateral wall.
2. The rubber friction testing device of claim 1, wherein the base is placed on a table top or the ground; the coupler is positioned below the circle center of the friction disc; the stator of the air slip ring is fixed on the central pipeline, and the rotor is connected with the friction disk through a hose.
3. The rubber friction testing device according to claim 1, wherein the radius of the friction disk is 30cm, the annular width is 8cm, and the height of the hollow portion is 7mm; the fence is arc-shaped, the height is 2-5cm, and the fence is closed inwards; the diameter of the bleed hole was 1mm.
4. The rubber friction testing device according to claim 2, wherein a gasket made of rubber is arranged between the round tube and the friction disc, and is fixed by a screw, and an included angle between two adjacent round tubes is 30 degrees; the outside of hose is wrapped up with insulating material, and one end is fixed in friction disc's lower surface edge department.
5. The rubber friction testing device according to claim 4, wherein the thermometer is a radiation thermometer with a measuring range of-40-80 ℃; the heating pipes are infrared radiation heating pipes, 3 heating pipes are arranged side by side, the adjacent distance is 3cm, each power is 1500W, and the circuit of the heating pipes is arranged in the central pipeline in a penetrating way; the friction belt comprises a zirconia corundum abrasive belt with the granularity of 36 #.
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| CN202111596697 | 2021-12-24 | ||
| CN202111596697X | 2021-12-24 |
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| CN202220914018.2U Withdrawn - After Issue CN219391765U (en) | 2021-12-24 | 2022-04-20 | Rubber friction testing device |
| CN202210414440.6A Pending CN114720369A (en) | 2021-12-24 | 2022-04-20 | Rubber friction testing device |
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| WO (1) | WO2023116330A1 (en) |
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| CN219391765U (en) * | 2021-12-24 | 2023-07-21 | 青岛科技大学 | Rubber friction testing device |
| CN117470557B (en) * | 2023-10-08 | 2024-04-30 | 青岛茂驰橡胶制品有限公司 | Tyre anti-skid detection device |
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| JP2011158305A (en) * | 2010-01-29 | 2011-08-18 | Bridgestone Corp | Rubber friction tester and rubber friction test method |
| CN102359933A (en) * | 2011-09-25 | 2012-02-22 | 吉林大学 | System and method for testing all-weather tyre tread-road surface frictional characteristic |
| CN104913870B (en) * | 2015-05-05 | 2017-05-24 | 上海交通大学 | Friction measuring device and friction measuring method |
| CN206563704U (en) * | 2017-03-29 | 2017-10-17 | 黑龙江工程学院 | A kind of bridge pavement antiskid Testing Platform |
| CN107655825A (en) * | 2017-11-18 | 2018-02-02 | 哈尔滨工业大学（威海） | A kind of rubber for tire high speed ice face frictional behavior test device |
| CN110501249A (en) * | 2019-09-16 | 2019-11-26 | 青岛科技大学 | A kind of alternating temperature abrasion instrument that can be studied rubber simultaneously and roll with sliding friction behavior |
| CN219391765U (en) * | 2021-12-24 | 2023-07-21 | 青岛科技大学 | Rubber friction testing device |
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| WO2023116330A1 (en) | 2023-06-29 |
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