CN112595665A - Device and method for measuring sliding friction coefficient between poly V-ribbed belt and belt wheel - Google Patents

Device and method for measuring sliding friction coefficient between poly V-ribbed belt and belt wheel Download PDF

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CN112595665A
CN112595665A CN202011640092.1A CN202011640092A CN112595665A CN 112595665 A CN112595665 A CN 112595665A CN 202011640092 A CN202011640092 A CN 202011640092A CN 112595665 A CN112595665 A CN 112595665A
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belt
wedge
wheel
ribbed belt
sliding friction
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王红民
蒋金华
上官文斌
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South China University of Technology SCUT
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South China University of Technology SCUT
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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

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Abstract

The invention discloses a device and a method for measuring a sliding friction coefficient between a poly V-belt and a belt wheel, belonging to the field of measuring the sliding friction coefficient. The tension and the wrap angle between the V-ribbed belt and the belt wheel can be measured, and the sliding friction coefficient between the V-ribbed belt and the belt wheel can be calculated. The measuring device comprises an upright post, a motor, a force sensor, a multi-wedge belt clamp, a tension regulator, a base and the multi-wedge belt clamp. The belt wheel to be tested is rigidly arranged on a motor shaft, and the motor drives the belt wheel fixed shaft to rotate; the V-ribbed belt is connected with the force sensor and the tension regulator through the clamp, and then one end of the V-ribbed belt is fixed on the base, and the other end of the V-ribbed belt is fixed on the upright post; the tension regulator regulates the initial tension of the V-ribbed belt; the force sensor collects a real-time tension signal; and obtaining the sliding friction coefficient between the V-ribbed belt and the belt wheel according to the measured data. The device for measuring the sliding friction coefficient between the V-ribbed belt and the belt wheel, provided by the invention, has the advantages of good universality, wide application range, simple measurement method and accurate result, and meets the measurement requirement of the sliding friction coefficient.

Description

Device and method for measuring sliding friction coefficient between poly V-ribbed belt and belt wheel
Technical Field
The invention belongs to the field of sliding friction coefficient measurement, and particularly relates to a device and a method for measuring a sliding friction coefficient between a poly V-belt and a belt wheel.
Background
The sliding friction coefficient is the ratio between the friction force and the positive pressure when objects in contact with each other do relative motion, and is the property of the objects. The sliding friction coefficient is influenced by the surface roughness, temperature, humidity and other factors of the object contact surface. The coefficient of sliding friction is an important technical parameter, and is commonly used for researching the nonlinear dynamic phenomenon caused by friction.
The sliding friction coefficient between the V-ribbed belt and the belt wheel is the ratio of the friction force and the positive pressure when the V-ribbed belt and the belt wheel slide relatively, and is divided into a belt back-flat wheel sliding friction coefficient and a belt wedge-wedge wheel sliding friction coefficient. The V-ribbed belt is contacted with the surface of the belt wheel on a section of circular arc, and the technical difficulty exists in directly measuring the friction force and the positive pressure between the V-ribbed belt and the belt wheel contact surface, and the V-ribbed belt occupies higher cost in engineering practice.
Disclosure of Invention
The invention provides a device and a method for measuring a sliding friction coefficient between a poly V-ribbed belt and a belt wheel, which can respectively measure a sliding friction coefficient between a belt back and a flat wheel and an equivalent sliding friction coefficient between a poly V-ribbed belt wedge and a wedge wheel, and can obtain the sliding friction coefficient between the poly V-ribbed belt wedge and the wedge wheel through calculation; the measuring device can measure the multi-wedge belts and belt wheels with different specifications, and has certain universality; the measuring device has a simple structure, and reduces the processing difficulty.
The object of the invention is achieved by at least one of the following solutions.
A measuring device for the sliding friction coefficient between a poly V-belt and a belt wheel comprises a vertical column, the belt wheel, a poly V-belt fixing base, a motor, a poly V-belt, two poly V-belt clamps, a tension regulator and two poly V-belt force sensors,
the upright post is provided with an adjusting hole;
the upright post, the belt wheel and the V-ribbed belt fixing base are positioned on the same horizontal plane, and the belt wheel is detachably fixed on an output shaft of the motor;
the V-ribbed belt is in contact with the belt wheel, and two ends of the V-ribbed belt are detachably connected with the V-ribbed belt clamp respectively, wherein the V-ribbed belt clamp close to one side of the upright post is defined as a first V-ribbed belt clamp, and the V-ribbed belt clamp close to one side of the V-ribbed belt fixing base is defined as a second V-ribbed belt clamp;
the first multi-wedge belt clamp, one of the multi-wedge belt force sensors and the tension regulator are sequentially detachably connected, and the free end part of the tension regulator is detachably connected with the regulating hole;
and the other multi-wedge belt force sensor is detachably connected with the second multi-wedge belt clamp and the multi-wedge belt fixing base respectively.
Further, one surface of the V-ribbed belt is a plane, the other opposite surface of the V-ribbed belt is a wedge surface, the plane of the V-ribbed belt is defined as a belt back, and the wedge surface is defined as a belt wedge;
the belt wheel comprises a flat wheel and a wedge wheel, the sliding friction coefficient between the poly-wedge belt and the belt wheel comprises a sliding friction coefficient between the belt wedge and the wedge wheel and a friction coefficient between a belt back and the flat wheel, when the sliding friction coefficient between the belt wedge and the wedge wheel is measured, the belt wedge of the poly-wedge belt is in contact transmission with the wedge wheel, and when the sliding friction coefficient between the belt back and the flat wheel is measured, the belt back of the poly-wedge belt is in contact transmission with the flat wheel.
Furthermore, a plurality of adjusting holes are formed in the upright column along the height direction.
Further, each multi-wedge belt clamp comprises an upper clamp and a lower clamp, and protrusions are arranged on contact surfaces of the upper clamp and the lower clamp with the multi-wedge belt.
Further, in each multi-wedge belt clamp, the upper clamp and the lower clamp are fixed by bolts.
Further, the tension adjuster is of a turnbuckle structure.
The system further comprises an Somat data collector and a computer, wherein the Somat data collector is connected with the output ends of the two V-ribbed belt force sensors, and the Somat data collector is connected with the computer.
The invention also provides a method for measuring the sliding friction coefficient between the V-ribbed belt and the belt wheel, which comprises the following steps:
adjusting the tension adjuster, wherein the two V-ribbed belt force sensors acquire initial tension at two ends of the V-ribbed belt, and when data acquired by the two V-ribbed belt force sensors are kept equal for a period of time without external force interference, the data are taken as an initial state of measurement;
adjusting the rotating speed of the motor, stabilizing the rotating speed of the motor at a certain value, acquiring real-time tension at two ends of the V-ribbed belt by the two V-ribbed belt force sensors, acquiring data within a set time after the rotating speed of the motor is stable, wherein the acquired data comprises the tension T at the tight edge of one side with larger tension of the V-ribbed beltdAnd the slack side tension T on the side with smaller tension of the V-ribbed beltj；
Obtaining a wrap angle between the V-ribbed belt and the belt wheel;
and obtaining the sliding friction coefficient between the V-ribbed belt and the belt wheel according to the wrap angle, the tight edge tension and the loose edge tension.
Further, the obtaining of the v-ribbed belt-pulley wrap angle specifically includes:
acquiring a distance a between the axis of the belt wheel and the axis of an adjusting hole of the fixed tension regulator, defining the distance a as a first distance, acquiring a distance b between the axis of the belt wheel and the poly V-belt fixed base, defining the distance b as a second distance, and acquiring the radius r of the belt wheel;
acquiring the total length L of a tension regulator, two multi-wedge belt force sensors, two multi-wedge belt clamps and a multi-wedge belt which are positioned between an upright post and a multi-wedge belt fixing base;
obtaining a wrap angle β between the V-ribbed belt and the pulley by the first distance, the second distance, the radius and the total length, and calculating as follows:
Figure BDA0002878205750000021
further, the calculation formula of the sliding friction coefficient between the back and the flat wheel of the multi-wedge belt is as follows:
Figure BDA0002878205750000031
the calculation formula of the sliding friction coefficient between the wedge wheels and the wedge wheels is as follows:
Figure BDA0002878205750000032
in the formula, muaFor multi-wedge belts with coefficient of sliding friction, mu, between back and flat wheelsbThe coefficient of sliding friction between the wedge and the wedge wheel of the multi-wedge belt, the coefficient of equivalent sliding friction between the wedge and the wedge wheel of the mu multi-wedge belt, beta is the wrap angle between the multi-wedge belt and the belt wheel, TdThe tension is the tight edge tension when the V-ribbed belt and the belt wheel slide relatively; t isjThe tension is the loose edge tension when the V-ribbed belt and the wheel slide relatively, and phi is the V-ribbed belt wedge angle.
The device for measuring the sliding friction coefficient between the V-ribbed belt and the belt wheel has the beneficial effects that:
the sliding friction coefficient between the V-ribbed belt and the belt wheel is calculated by measuring the tight edge tension, the loose edge tension and the wrap angle between the V-ribbed belt and the belt wheel when the V-ribbed belt and the belt wheel slide relatively, and the operation difficulty in the measuring process is low; the tight-side tension and the loose-side tension of the V-ribbed belt are measured by using force sensors with different measuring ranges, so that the accuracy of parameter measurement is ensured; the vertical column, the clamp and other devices have larger adjustable space, and the polywedge belt and belt wheels with different specifications can be replaced for measurement, so that the universality of the experimental device is improved; the upright post is provided with a plurality of holes, so that the wrap angle between the V-ribbed belt and the belt wheel can be conveniently changed, and the possibility of measuring the sliding friction coefficient between the V-ribbed belt and the belt wheel under various working conditions is increased; and calculating the equivalent friction coefficient between the wedge and the wedge wheel according to the measured data.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and the drawings in the following description are only one embodiment of the present invention.
Fig. 1 is a schematic view of a device for measuring a sliding friction coefficient between a v-ribbed belt and a pulley provided by the invention.
Fig. 2 is a schematic structural view of the column in fig. 1.
Fig. 3 is a schematic view of the tension regulator of fig. 1.
Fig. 4 is a schematic structural view of the upper clamp in fig. 1.
Fig. 5 is a schematic view of the structure of the lower clamp in fig. 1.
FIG. 6 is a block diagram of a test bed for measuring the sliding friction coefficient between the V-ribbed belt and the belt wheel.
FIG. 7 is a connection diagram of a protection circuit of a driving system of the V-ribbed belt-pulley sliding friction coefficient measuring device.
Fig. 8 is a graph showing the tight side tension and the loose side tension when the v-ribbed belt and the pulley slide relative to each other according to the embodiment of the present invention.
Fig. 9 is a graph of the frictional coefficient of friction versus time for the v-ribbed belt and pulley of an embodiment of the present invention.
Fig. 10 is a schematic view of the contact force between the wedge surface of the V-ribbed belt and the wedge wheel.
In the figure: 1. a column 101 and an adjusting hole; 2. a tension adjuster; 3. a poly-v-belt force sensor; 4. a multi-wedge clamp, 401, an upper clamp, 402, a lower clamp; 5. a motor; 6. a V-ribbed belt fixing base; 7. a motor base; 8. a pulley; 9. a V-ribbed belt; 10. a frequency converter; 11. operating a green light; 12. a scram switch; 13. a power switch; 14. a power supply red light; 15. an air switch.
Detailed Description
In order to more clearly illustrate the technical solutions and the technical problems to be solved by the present invention, the following will describe specific embodiments of the present invention according to the accompanying drawings.
Example 1
The device for measuring the sliding friction coefficient between the V-ribbed belt and the belt wheel provided by the embodiment comprises a test bed floor, and an upright post 1, a belt wheel 8, a V-ribbed belt fixing base 6, a motor 5, a V-ribbed belt 9, two V-ribbed belt clamps 4, a tension regulator 2 and two V-ribbed belt force sensors 3 which are arranged on the test bed floor. The system further comprises a frequency converter 10 and a data acquisition system, wherein the data acquisition system comprises a Somat data acquisition unit and a computer controller.
The stand 1 contains I-beam and base, and processing has the mounting hole on the base, and the stand 1 passes through the bolt and the mounting hole installation is fixed on test bench floor. The I-beam is provided with an adjusting hole 101 for mounting the fixed end of the tension adjuster 2. In this embodiment, the plurality of adjusting holes 101 are arranged at equal intervals, and the wrapping angle between the v-ribbed belt and the belt pulley can be changed by changing the installation position of the tension adjuster 2 on the upright post 1, so that more selectable working conditions can be provided for measurement.
The upright post 1, the belt wheel 8 and the V-ribbed belt fixing base 6 are positioned on the same horizontal plane, the belt wheel 8 is fixed on an output shaft of the motor 5, and the motor 5 is fixed on the floor of the test bed through the motor base 7; the V-ribbed belt 9 is contacted with the belt wheel 8, and two ends of the V-ribbed belt 9 are respectively detachably connected with a V-ribbed belt clamp 4, wherein the V-ribbed belt clamp 4 close to one side of the upright post 1 is defined as a first V-ribbed belt clamp, and the V-ribbed belt clamp 4 close to one side of the V-ribbed belt fixing base 6 is defined as a second V-ribbed belt clamp; the first multi-wedge belt clamp, one multi-wedge belt force sensor 3 and the tension regulator 2 are sequentially detachably connected, and the free end part of the tension regulator 2 is detachably connected with the regulating hole 101; the other multi-v-belt force sensor 3 is detachably connected to the second multi-v-belt clamp and the multi-v-belt fixing base 6, respectively. The V-ribbed belt fixing base 6 is fixed on the floor of the test bed through bolts, and the V-ribbed belt 9 is ensured to be vertical to the output shaft of the motor 5 by adjusting the fixing position of the fixing base 6 on the floor of the test bed.
The belt wheel 8 comprises a flat wheel and a wedge wheel, one surface of the V-ribbed belt 9 is a plane, the other opposite surface is a wedge surface, the plane of the V-ribbed belt 9 is defined as a belt back, the wedge surface is defined as a belt wedge, the sliding friction coefficient between the V-ribbed belt and the belt wheel comprises a sliding friction coefficient between the belt wedge and the wedge wheel and a friction coefficient between the belt back and the flat wheel, when the sliding friction coefficient between the belt wedge and the wedge wheel is measured, the belt wedge of the V-ribbed belt 9 is in contact transmission with the wedge wheel, and when the friction coefficient between the belt back and the flat wheel is measured, the belt back of the V-ribbed belt 9 is in contact transmission with the flat wheel. Wherein, the output shaft of the motor 5 can be provided with two mounting positions, and the flat wheel and the wedge wheel are respectively fixed on the two mounting positions; the output shaft of the motor 5 can also be provided with only one mounting position, when the sliding friction coefficient between the belt wedge and the wedge wheel is measured, the wedge wheel is fixed on the mounting position of the output shaft of the motor 5, when the sliding friction coefficient between the belt back and the flat wheel is measured, the wedge wheel is detached, and then the flat wheel is fixed on the mounting position of the output shaft of the motor 5.
In this embodiment, the tension adjuster 2 is a turnbuckle structure, and the length of the tension adjuster 2 in the tension direction of the v-ribbed belt 9 can be changed by rotating the adjusting rod on the tension adjuster 2, so as to achieve the purpose of changing the initial tension at the two ends of the v-ribbed belt, and the bolt of the tension adjuster 2 can provide a certain degree of friction force when being subjected to radial tension, so that the length of the tension adjuster is kept to be constant in the measuring process.
In this embodiment, each v-ribbed belt clamp 4 includes an upper clamp 401 and a lower clamp 402, the upper clamp 401 and the lower clamp 402 are respectively provided with v-ribbed belt mounting holes (4 v are respectively provided in this embodiment), and one side of the lower clamp 402 is provided with a sensor mounting hole perpendicular to the mounting direction of the v-ribbed belt. The lower clamp 402 and the upper clamp 401 of the V-ribbed belt clamp 4 are connected and fixed with the V-ribbed belt 9 through 4 bolts, and the clamping degree of the V-ribbed belt is ensured by the pretightening force of the connecting bolts. The upper clamp 401 and the lower clamp 402 of the V-ribbed belt clamp 4 are provided with protrusions on the surfaces contacted with the V-ribbed belt, so that the friction between the V-ribbed belt clamp 4 and the V-ribbed belt is increased, and the V-ribbed belt is prevented from falling off under the action of the clamps in the measuring process. In the lower clamp 402 of the V-ribbed belt clamp 4, 2 sensor mounting holes perpendicular to the installation direction of the V-ribbed belt are connected with the V-ribbed belt force sensor 3 through penetrating long bolts, so that the state that one side of the V-ribbed belt clamp 4 is connected with the V-ribbed belt 9 and the other side of the V-ribbed belt force sensor 3 is ensured.
The embodiment controls the rotating speed of the motor by controlling the frequency indication of the frequency converter. A protection circuit is arranged between the 220V alternating current power supply 16 and the motor 5. The whole protection circuit comprises an operation green light 11, an emergency stop switch 12, a power switch 13, a power red light 14, an air switch 15, a connecting wire, a distribution box and a socket, and the frequency converter 10 and the motor 5 are connected into the protection circuit. The electrical components are connected according to fig. 7. The circuit is connected with a power supply, a power switch 13 is turned on, parameters of the frequency converter 10 are set, and the motor 5 rotates at a constant speed according to a preset rotating speed under the control of the frequency converter 10. The emergency stop switch 11 is a normally closed switch, when an emergency fault occurs in the operation process, the circuit can be disconnected by pressing the emergency stop switch 11, the motor 5 is stopped, after the circuit fault is repaired, the emergency stop switch does not need to be operated, and the power switch 13 is turned on again to connect the circuit. When the circuit is in serious overload or short-circuit fault, the air switch 15 can be opened in time to protect the electrical equipment in the circuit. When the power supply is switched on and the power switch 13 is not turned on to switch on the circuit, the power red lamp 14 keeps on, the green lamp 11 keeps on normally after the circuit is switched on, and the power red lamp 14 and the green lamp 11 can enable an operator to know the switching-on state of the whole circuit in real time.
The frequency converter 10 adjusts the voltage and frequency of the output power supply by switching on and off the internal IGBT, provides the required power supply voltage according to the actual requirement of the motor 5, and further achieves the purposes of energy saving and speed regulation. The laboratory voltage is 220V, 380V voltage can be supplied to the motor through the frequency converter 10, and the rotating speed of the motor 5 is also regulated by the frequency converter 10. In the circuit system, a power supply red lamp 14 is normally on after the power supply is switched on, a power supply green lamp 11 is normally on after a power supply switch 13 is switched on, at the moment, the frequency converter 10 and the motor 5 are also connected into a circuit, and the rotating speed of the motor 5 can be controlled by rotating the frequency modulation knob of the frequency converter 10. The power of the motor 5 is 1.5kW, and the motor is connected with the frequency converter and is connected with a power supply through a switch and a protection circuit.
Two channels of the Somat data acquisition unit are respectively connected with the two V-ribbed belt force sensors 3 and are connected with a computer, force signals of the V-ribbed belt force sensors in the measurement process are acquired in real time, and force signal time domain curves are displayed on a screen of the computer, so that real-time data of the forces acquired by the two V-ribbed belt force sensors 3 can be visually observed in the measurement process. Under the setting of the frequency converter 10, the output shaft of the motor 5 drives the belt pulley 8 to rotate clockwise or anticlockwise, in the process of uniform rotation of the belt pulley 8, one side of the belt pulley 8 and the V-ribbed belt 9 which gradually enter a contact state is a V-ribbed belt 9 tight side, one side of the belt pulley 8 and the V-ribbed belt 9 which gradually leave the contact state is a V-ribbed belt 9 loose side, in the measurement process, the tight side tension is far greater than the loose side tension, the tight side tension can also be visually observed in a computer screen, a force signal with greater tension is the tight side tension of the V-ribbed belt 9, and a force signal with smaller tension is the loose side tension of the V-ribbed belt 9.
The Somat collector stores data after the signal acquisition of the force sensor 3 is finished, and reads the stored force signal acquired by the force sensor 3 by means of the software ncode for processing the measurement data.
Example 2
Essentially the same as in example 1, except that: the embodiment also provides a method for measuring the sliding friction coefficient between the belt back and the flat wheel by adopting the measuring device. At the moment, a flat wheel is fixedly arranged on an output shaft of a motor of the measuring device, and the belt back of the V-ribbed belt is in contact transmission with the flat wheel.
A method for measuring the sliding friction coefficient between a multi-wedge belt back and a flat wheel comprises the following steps:
(1) before measurement, the indoor temperature and humidity are ensured to be constant, the upright post 1, the V-ribbed belt fixing base 6 and the motor base 7 are fixed according to the embodiment 1, the V-ribbed belt 9 with proper length is cut, two ends of the V-ribbed belt 9 are respectively fixed at one end of two V-ribbed belt clamps 4 through bolts, the other ends of the two V-ribbed belt clamps 4 are respectively connected with a V-ribbed belt force sensor 3, wherein the V-ribbed belt force sensor 3 connected with a second V-ribbed belt clamp is directly and fixedly connected with the V-ribbed belt fixing base 6 through bolts, the V-ribbed belt force sensor 3 connected with a first V-ribbed belt clamp is connected with one end of a tension regulator 2, the other end of the tension regulator is inserted and fixed in one of the regulating holes 101 of the I-beam of the upright post 1, the belt wheel 8 is rigidly connected with the output shaft of the motor 5, the installed belt wheel 8, the upright post 1 and the V-ribbed belt fixing base 6, the multi-wedge belt force sensor 3, the Somat data acquisition unit and the computer are connected, and the motor 5, the frequency converter 10, the protection circuit and the power supply are connected;
(2) during measurement, the two V-ribbed belt force sensors 3 collect the tension at the two ends of the V-ribbed belt 9, the tension regulator 2 is regulated, the tension at the two ends of the V-ribbed belt 9 changes in real time along with the extension and retraction of the tension regulator 2, the real-time tension data collected by the two V-ribbed belt force sensors 3 displayed on a computer screen is observed, when the tension data collected by the two V-ribbed belt force sensors 3 are equal, the tension regulator 2 is stopped being regulated, and the state that the tensions at the two ends of the V-ribbed belt 9 are equal can be used as the initial state of measurement;
(3) turning on the frequency converter 10 to slowly increase to a certain frequency, at this time, stabilizing the motor 5 at a certain rotation speed, collecting force signals of the two v-ribbed belt force sensors 3, when the tight-side tension and the loose-side tension are seen to be stabilized within a preset time (the preset time in the embodiment is 20s) from the computer screen, returning the speed regulation knob of the frequency converter 10 to zero, and slowly decelerating the motor 5 under the control of the frequency converter 10 until the motor stops. If the operation time of the motor 5 is too long, a large amount of heat is generated between the V-ribbed belt 9 and the belt wheel 8 due to long-time relative sliding, so that the V-ribbed belt 9 and the belt wheel 8 are glued, abraded and the like, and the measurement result is influenced;
(4) after the measurement is finished, a software ncode is used for reading a force signal of tight side tension and loose side tension in 20s and corresponding time information, which are acquired by a Somat collector, the number of the force signal of the tight side tension and loose side tension in 20s and a sampling point corresponding to the time depends on the setting of sampling frequency, the sampling frequency does not influence the measurement result of the sliding friction coefficient, so that the measurement has no special requirement on the sampling frequency, the force signal of the tight side tension and loose side tension in 20s and a wrap angle are substituted into a formula to obtain a group of values of the sliding friction coefficient between the back of the multi-wedge belt and the flat wheel in 20s, the values of the sliding friction coefficient between the back of the multi-wedge belt and the flat wheel in 20s can be drawn into a curve taking the time as a horizontal coordinate and the sliding friction coefficient between the back of the multi-wedge belt and the flat wheel as a vertical coordinate, and the measurement result is accurate and usable if the curve is smooth and a quasi-synthesized straight line is almost in a horizontal state, if the curve has large fluctuation or the slope of the synthetic straight line is not 0, the curve is influenced by factors such as abrasion in the measuring process, and the V-ribbed belt 9 is replaced again for measurement. The calculation formula of the sliding friction coefficient between the multi-wedge belt back and the flat wheel is as follows:
Figure BDA0002878205750000071
in the formula, muaThe sliding friction coefficient between the multi-wedge belt back and the flat wheel is adopted; beta is a polywedge belt-pulleyInter wrap angle, rad; t isdThe tension is the tight edge tension when the V-ribbed belt and the belt wheel slide relatively, N; t isjThe loosening tension N is the loosening tension when the V-ribbed belt and the wheel slide relatively.
For a curve with time as an abscissa and the sliding friction coefficient between the back of the multi-wedge belt and the flat wheel as an ordinate, a plurality of points are randomly selected from the curve, 5 points are selected in the embodiment, and the average value of the sliding friction coefficient between the back of the multi-wedge belt and the flat wheel of the 5 points is calculated and can be used as the final measurement result of the sliding friction coefficient between the back of the multi-wedge belt and the flat wheel.
As described in detail with reference to fig. 1, the measurement of the wrap angle is more difficult to obtain an accurate value in engineering practice than the measurement of the distance, and in the conventional measurement of the sliding friction coefficient between the v-ribbed belt and the pulley, the tangent point of the v-ribbed belt 9 on the pulley 8 during the wrap angle measurement is often determined manually, and has a larger error. Converting the wrap angle measurement to a strip length measurement can improve the accuracy of the measurement. The specific measurement method is as follows:
measuring the distance a between the axis of the belt wheel 8 and the axis of the adjusting hole of the fixed tension regulator 2, measuring the distance b between the axis of the belt wheel 8 and the V-ribbed belt fixing base 6, measuring the radius r of the belt wheel 8, measuring the total length L of the tension regulator 2, the two V-ribbed belt force sensors 3, the two V-ribbed belt clamps 4 and the V-ribbed belt 9 which are positioned between the upright post 1 and the V-ribbed belt fixing base 6, and substituting a, b, r and L into a wrapping angle calculation formula, wherein the wrapping angle between the V-ribbed belt 9 and the belt wheel 8 in the initial state can be calculated and measured, and the calculation formula is as follows:
Figure BDA0002878205750000072
example 3
Essentially the same as in example 2, except that: the coefficient of sliding friction between the wedge and the wedge wheel of the multi-wedge belt is measured in the embodiment. At the moment, a wedge wheel is fixed on the output shaft of the motor on the measuring device, and the belt wedge of the multi-wedge belt is in contact transmission with the wedge wheel.
Example 2 multiple wedgesMethod for measuring coefficient of sliding friction between belt back and flat pulley, if the object to be measured is coefficient of sliding friction between wedge and wedge of multi-wedge belt, the result obtained by the measuring method of example 2 is coefficient of equivalent sliding friction between wedge and wedge of multi-wedge beltvIn order to obtain the actual sliding friction coefficient between the wedge and the wedge wheel, conversion is carried out, and the conversion formula is as follows:
Figure BDA0002878205750000073
in the formula, phi is a wedge angle of the V-ribbed belt deg; mu.sbThe sliding friction coefficient between the multi-wedge belt wedge and the wedge wheel is adopted; mu.svThe equivalent sliding friction coefficient between the multi-wedge belt wedge and the wedge wheel is shown.
The above description is an embodiment of the present invention, and the measurement result of the apparatus for measuring the sliding friction coefficient between the v-ribbed belt and the pulley is good when the apparatus is in use.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A device for measuring the sliding friction coefficient between a poly V-belt and a belt wheel is characterized in that: the device comprises a stand column (1), a belt wheel (8), a multi-wedge belt fixing base (6), a motor (5), a multi-wedge belt (9), two multi-wedge belt clamps (4), a tension regulator (2) and two multi-wedge belt force sensors (3);
the upright post (1) is provided with an adjusting hole (101);
the upright post (1), the belt wheel (8) and the V-ribbed belt fixing base (6) are positioned on the same horizontal plane, and the belt wheel (8) is fixed on an output shaft of the motor (5);
the V-ribbed belt (9) is in contact with the belt wheel (8) and two ends of the V-ribbed belt (9) are respectively detachably connected with the V-ribbed belt clamps (4), wherein the V-ribbed belt clamp (4) close to one side of the upright post (1) is defined as a first V-ribbed belt clamp, and the V-ribbed belt clamp (4) close to one side of the V-ribbed belt fixing base (6) is defined as a second V-ribbed belt clamp;
the first multi-wedge belt clamp, one of the multi-wedge belt force sensors (3) and the tension regulator (2) are sequentially detachably connected, and the free end of the tension regulator (2) is detachably connected with the regulating hole (101);
and the other multi-wedge belt force sensor (3) is detachably connected with the second multi-wedge belt clamp and the multi-wedge belt fixing base (6) respectively.
2. The apparatus for measuring a v-ribbed belt-pulley sliding friction coefficient according to claim 1, wherein: one surface of the V-ribbed belt (9) is a plane, the other opposite surface of the V-ribbed belt is a wedge surface, the plane of the V-ribbed belt (9) is defined as a belt back, and the wedge surface is defined as a belt wedge;
the belt wheel (8) comprises a flat wheel and a wedge wheel, the sliding friction coefficient between the poly wedge belt and the belt wheel comprises a sliding friction coefficient between the wedge belt and the wedge wheel and a friction coefficient between a belt back and the flat wheel, when the sliding friction coefficient between the wedge belt and the wedge wheel is measured, the belt wedge of the poly wedge belt (9) is in contact transmission with the wedge wheel, and when the sliding friction coefficient between the belt back and the flat wheel is measured, the belt back of the poly wedge belt (9) is in contact transmission with the flat wheel.
3. The apparatus for measuring a v-ribbed belt-pulley sliding friction coefficient according to claim 1, wherein: a plurality of adjusting holes (101) are formed in the upright post (1) along the height direction.
4. The apparatus for measuring a v-ribbed belt-pulley sliding friction coefficient according to claim 1, wherein: each multi-wedge belt clamp (4) comprises an upper clamp (401) and a lower clamp (402), and protrusions are arranged on the contact surfaces of the upper clamp (401) and the lower clamp (402) and the multi-wedge belt (9).
5. The apparatus for measuring a v-ribbed belt-pulley sliding friction coefficient according to claim 4, wherein: in each multi-wedge belt clamp (4), the upper clamp (401) and the lower clamp (402) are fixed through bolts.
6. The apparatus for measuring a v-ribbed belt-pulley sliding friction coefficient according to claim 1, wherein: the tension regulator (2) is of a turnbuckle structure.
7. The apparatus for measuring a v-ribbed belt-pulley sliding friction coefficient according to claim 1, wherein: the multi-wedge-belt force sensor is characterized by further comprising an Somat data collector and a computer, wherein the Somat data collector is connected with output ends of the two multi-wedge-belt force sensors (3), and is connected with the computer.
8. A method for measuring a sliding friction coefficient between a v-ribbed belt and a pulley, which is performed by using the apparatus for measuring a sliding friction coefficient between a v-ribbed belt and a pulley according to claims 1 to 7, comprising the steps of:
adjusting the tension adjuster (2), acquiring initial tensions at two ends of the V-ribbed belt (9) by the two V-ribbed belt force sensors (3), and taking the data as an initial state of measurement when the data acquired by the two V-ribbed belt force sensors (3) are kept equal for a period of time without external force interference;
adjusting the rotating speed of the motor (5), stabilizing the rotating speed of the motor (5) at a certain value, acquiring real-time tension at two ends of the V-ribbed belt (9) by the two V-ribbed belt force sensors (3), acquiring data within a set time after the rotating speed of the motor (5) is stable, wherein the acquired data comprises the tension T at the tight edge of the side with larger tension of the V-ribbed belt (9)dAnd the slack side tension T on the side with smaller tension of the V-ribbed belt (9)j；
Obtaining a wrap angle between the V-ribbed belt and the belt wheel;
and obtaining the sliding friction coefficient between the V-ribbed belt and the belt wheel according to the wrap angle, the tight edge tension and the loose edge tension.
9. The method for measuring the v-ribbed belt-pulley sliding friction coefficient according to claim 8, wherein the obtaining the v-ribbed belt-pulley wrap angle specifically comprises:
acquiring a distance a between the axis of the belt wheel (8) and the axis of an adjusting hole (101) of the fixed tension adjuster (2) to be defined as a first distance, acquiring a distance b between the axis of the belt wheel (8) and the V-ribbed belt fixing base (6) to be defined as a second distance, and acquiring a radius r of the belt wheel (8);
acquiring the total length L of a tension regulator (2), two multi-wedge belt force sensors (3), two multi-wedge belt clamps (4) and a multi-wedge belt (9) which are positioned between an upright post (1) and a multi-wedge belt fixing base (6);
obtaining a wrap angle β between the V-ribbed belt (9) and the pulley (8) by the first distance, the second distance, the radius and the total length, and calculating as follows:
Figure FDA0002878205740000021
10. the method of claim 8, wherein the measuring of the V-ribbed belt-pulley sliding friction coefficient,
the calculation formula of the sliding friction coefficient between the multi-wedge belt back and the flat wheel is as follows:
Figure FDA0002878205740000022
the calculation formula of the sliding friction coefficient between the wedge wheels and the wedge wheels is as follows:
Figure FDA0002878205740000023
in the formula, muaFor multi-wedge belts with coefficient of sliding friction, mu, between back and flat wheelsbFor multi-wedge belts with a coefficient of sliding friction, mu, between wedge and wedge wheelvThe equivalent sliding friction coefficient between the wedge and the wedge wheel of the multi-wedge belt, beta is the wrap angle between the multi-wedge belt and the belt wheel, TdIs the tight edge tension T when the V-ribbed belt and the belt wheel slide relativelyjThe tension is the loose edge tension when the V-ribbed belt and the wheel slide relatively, and phi is the V-ribbed belt wedge angle.
CN202011640092.1A 2020-12-31 2020-12-31 Device and method for measuring sliding friction coefficient between poly V-ribbed belt and belt wheel Pending CN112595665A (en)

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