KR20170052725A - Thrust applying apparatus for sensitive test of torque measurement system of model hydraulic turbine - Google Patents

Thrust applying apparatus for sensitive test of torque measurement system of model hydraulic turbine Download PDF

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Publication number
KR20170052725A
KR20170052725A KR1020150153692A KR20150153692A KR20170052725A KR 20170052725 A KR20170052725 A KR 20170052725A KR 1020150153692 A KR1020150153692 A KR 1020150153692A KR 20150153692 A KR20150153692 A KR 20150153692A KR 20170052725 A KR20170052725 A KR 20170052725A
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KR
South Korea
Prior art keywords
swing frame
applying
unit
load
applying unit
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Application number
KR1020150153692A
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Korean (ko)
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KR101761696B1 (en
Inventor
방제성
박무룡
윤의수
손정락
황순찬
최범석
박준영
유일수
서정민
임형수
최원철
강도원
김병옥
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한국기계연구원
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Priority to KR1020150153692A priority Critical patent/KR101761696B1/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L25/00—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
    • G01L25/003—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency for measuring torque
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
    • G01L3/02—Rotary-transmission dynamometers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/0028—Force sensors associated with force applying means
    • G01L5/0038—Force sensors associated with force applying means applying a pushing force
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N15/00—Holding or levitation devices using magnetic attraction or repulsion, not otherwise provided for

Abstract

The present invention relates to an axial thrust applying apparatus for a sensitive test of a torque measurement system of a model hydraulic turbine. According to the present invention, an axial thrust applying apparatus for a sensitive test of a torque measurement system of a model hydraulic turbine can apply a load without friction with hydraulic pressure or a magnetic force when apply the load to a swing frame. Therefore, in a sensitive test, reliability of a torque value can be significantly improved.

Description

TECHNICAL FIELD [0001] The present invention relates to a thrust application device for a sensitivity test of a model aberration torque measurement system,

The present invention relates to a shaft thrust applying apparatus for a sensitivity test of a model aberration torque measuring system, and more particularly, to a shaft thrust applying apparatus for a sensitivity test of a model aberration torque measuring system capable of applying a thrust to a swing frame without friction using hydraulic pressure or magnetic force To an applicator.

The aberration is a mechanical device for generating electricity by means of hydraulic power, and the aberration generator is a device for generating electric power by rotating the rotation axis of the generator through an aberration using the water drop. Since the power generation efficiency depends on the performance of the aberration, it is necessary to carefully examine the performance before the production of the aberration.

Since the actual aberration is not only the flow rate but also the size of the main body, it takes much time and expense to evaluate the performance of efficiency and cavitation in the field of the power plant, and also there is a disadvantage that all the performance items can not be evaluated in the field test.

Accordingly, the performance of the aberration is measured by the scale reduction model according to IEC-60193, an international standard for model testing of aberrations. As a method of measuring the output of the model aberration, there is a shaft torque method.

1 is a schematic diagram of a model aberration performance test apparatus according to the conventional international standard. The model aberration performance test method according to the conventional international standard is a primary method in which a reaction force of a swing frame 11 incorporating a shaft system including a runner, a shaft, various bearings and seals of aberration, And measuring the torque by multiplying the length L of the lever arm 12 by the length.

The swing frame 11 is supported by a hydrostatic bearing and operated in a floating state so that pure hydrodynamic power acts as a reaction force of the swing frame 11. [ Thereby minimizing the friction loss between the swing frame 11 and the outer casing thereof.

 The fluid hydrostatic bearing uses a pair of journal bearings (11a) for supporting a radial thrust and one or a pair of thrust bearings (11b) for supporting an axial thrust, and a lubricant Or hydraulic oil is used.

These bearings, in principle, have a bearing gap of several tens of micrometers, and if the manufacture and assembly of peripheral parts including bearings are not precise, the performance of the bearings may be deteriorated or interference between the swing frame 11 and the peripheral casing may occur, Can not be ensured

Therefore, it is general to perform a sensitivity test on the above-mentioned torque measuring system before performance test of actual model aberration.

According to the IEC-60193 International Standard, a sensitivity level that depends on the measured torque value, but which responds to a torque value of at least 0.05 N-m, is recommended.

In the sensitivity test of the model aberration torque measurement system, it is desirable to measure the sensitivity level with the radial and axial loads applied to the swing frame 11 to simulate the actual situation.

 Generally, in the case of the axial flow type aberration, the radial load is the weight of the swing frame 11 itself which incorporates the shaft system of the model aberration, and the axial load is the axial thrust due to the pressure difference between the inlet and outlet of the runner Apply the appropriate force to the swing frame.

Accordingly, there is a need for a method of effectively applying an axial load to the swing frame 11 supported by the hydrostatic bearing and floating thereon without any friction loss.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems and it is an object of the present invention to provide a model aberration torque measurement system capable of applying a thrust force without friction to a swing frame using a fluid or a magnetic force, Of the axial thrust force applying device for the sensitivity test.

It is another object of the present invention to provide a shaft thrust applying device for a sensitivity test of a model aberration torque measuring system capable of remarkably improving the reliability of the measured value of the model aberration torque without the occurrence of friction,

According to the present invention, there is provided an axial thrust applying apparatus for a sensitivity test of a model aberration torque measuring system, comprising: a measured portion including a swing frame of the model aberration and a housing disposed apart from an outer circumferential surface of the swing frame; A sensitivity measuring unit installed on both outer sides of the swing frame in a radial direction from a shaft centerline of the swing frame to obtain the sensitivity torque value by adjusting the weight of either one of the two sides; And a shaft thrust applying unit that applies an axial thrust to the swing frame using a hydraulic or magnetic force. The shaft thrust applying apparatus for a sensitivity testing of a model aberration torque measuring system may be provided.

Here, the axis thrust applying unit may include: a load applying unit coupled to the swing frame; An opposite plate opposed to the load applying unit and having an orifice formed therein; And a fluid supply unit that supplies fluid to the orifice and applies a hydraulic pressure to the load application unit.

The axis thrust applying unit may further include a finishing unit spaced apart from one end of the swing frame and preventing external exposure of one end of the swing frame, and the facing plate may be installed in the finishing unit.

Further, the axis thrust applying unit may include: a load applying unit coupled to the swing frame; And a magnetic body disposed in a pair with the load applying unit therebetween and applying a load to the swing frame by applying a magnetic force to the load applying unit.

Further, each of the pair of magnetic bodies can be controlled so that the load applying portion and the attraction force act on the pair of magnetic bodies, respectively.

Further, each of the pair of magnetic bodies can be controlled so that the repulsive force acts on the load applying portion.

Further, magnitudes of the magnetic forces of the pair of magnetic bodies can be individually controlled.

The shaft thrust applying unit may further include a load cell.

The sensitivity measuring unit may include a pair of lever arms on both outer sides of the swing frame in the radial direction, A pair of weights each of which is provided at an outer end of the pair of lever arms and is adjustable in weight; And a minute weight provided so as to apply a weight to one of the weights in a state in which the pair of lever arms are kept in equilibrium.

According to the present invention, there is provided a shaft thrust applying apparatus for a sensitivity test of a model aberration torque measuring system capable of applying a thrust to a swing frame without friction in a sensitivity test of a model aberration torque measuring system.

Also, since the sensitivity test of the model aberration torque measuring system is performed with the shaft thrust applied to the swing frame without friction, a sensitivity thrust applying apparatus for sensitivity testing of a model aberration torque measuring system capable of obtaining a reliable test result is provided.

FIG. 1 is a schematic view of a model aberration performance test apparatus according to the conventional international standard,
FIG. 2 is a schematic view of a shaft thrust applying device for sensitivity testing of a model aberration torque measuring system according to a first embodiment of the present invention,
3 is an enlarged view of the axial thrust applying portion of Fig. 2,
4 is a schematic view of a modification of the axial thrust applying device for sensitivity testing of the model aberration torque measuring system according to the present invention,
FIG. 5 is a schematic view of the sensitivity measuring unit of the axial thrust applying apparatus for sensitivity testing of the model aberration torque measuring system of FIG. 2;
6 is a schematic diagram of an axial thrust application device for sensitivity testing of a model aberration torque measurement system of the present invention.

Prior to the description, components having the same configuration are denoted by the same reference numerals as those in the first embodiment. In other embodiments, configurations different from those of the first embodiment will be described do.

Hereinafter, a thrust applying apparatus for a model aberration sensitivity test according to a first embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a schematic view of a shaft thrust applying device for sensitivity testing of a model aberration torque measuring system according to a first embodiment of the present invention.

Referring to FIG. 2, the axisymmetric force application apparatus 100 for measuring sensitivity of a model aberration torque measurement system according to the first embodiment of the present invention includes a measured part 110, a swing frame 111 of a measured part 110, An axial force applying unit 120, a finishing unit 130, and a sensitivity measuring unit 140 (see FIG. 5).

In the drawings, power transmission devices (gears) and mechanics connecting the model aberration axis and the generator shaft are omitted.

In addition, the axial thrust applying unit 120 can be disassembled and removed at the time of actual performance test for the sensitivity test of the model aberration torque measurement system performed before the actual performance test of the model aberration, The lever arm of the sensitivity measurement unit 140 is removed, and the hole for the lever arm can be closed.

The measured part 110 corresponds to the configuration of the model aberration reduced to a certain ratio with respect to the actual aberration according to the international standard in order to measure various performance of the actual aberration. The swing frame 111, the fluid supply part 112, a journal bearing 113 and a fluid static thrust bearing 114. [

In the actual aberration operation, the power absorbed by the runner is transmitted to the generator shaft through the aberration axis, and the center axis 111a of the swing frame 111, The axial thrust due to the pressure difference of the thrust bearing 111 acts on the swing frame 111 by the aberration bearing. In order to reflect such a power, an axial thrust is applied to the swing frame 111 by the axial thrust applying unit 120.

The sensitivity of the shaft 130 applied to the swing frame 111 can be measured by the sensitivity measuring unit 140 to be described later depending on whether the center axis 111a coincides with the virtual axis of rotation or whether the axis 113 is in contact with the bearing 113 Do.

The stopper 112 is disposed to be spaced apart from the outer circumferential surface of the swing frame 111 and does not rotate unlike the swing frame 111. [

The journal bearing 113 is disposed between the swing frame 111 and the stopper 112 to facilitate the rotation of the swing frame 111 while supporting a load applied to the swing frame 111.

The hydrostatic thrust bearing (114) has a thrust collar between a pair of thrust bearings, through which the axial load is supported by the hydraulic pressure and the action of the working area against the axial thrust.

Although the swing frame 111, the stop 112, the journal bearing 113 and the fluid static thrust bearing 114 are not completely identical to actual aberrations, they may be applied to evaluate the performance of actual aberrations through model aberrations have.

The thrust applying unit 120 applies a thrust force to the swing frame 111 without any friction. When friction is applied to the swing frame 111 in the sensitivity test, the reliability of the sensitivity test itself may be reduced. Therefore, the axial thrust applying unit 120 may be configured to apply the thrust force to the swing frame 111 do.

3 is an enlarged view of the axial thrust applying portion of Fig. 3, the axial thrust applying unit 120 includes a load applying unit 121, an opposing plate 122, a fluid supplying unit 123, and a load cell 124.

The load applying unit 121 is installed at one axial end of the swing frame 111 with the load cell 124 interposed therebetween and is provided from the orifice 122a of the counter plate 122 of the same type as the thrust bearing A load is applied to the swing frame 111 by the fluid.

In this embodiment, the magnitude of the axial thrust applied to the swing frame 111 through the load applying unit 121 is measured.

The opposite plate 122 is opposed to the load applying unit 121 and is coupled to the inner surface of the finishing unit 130 in this embodiment. An orifice 122a is formed in the opposite plate 122 and a fluid supply unit 123 is connected to the orifice 122a.

The fluid supplied through the orifice 122a from the fluid supply unit 123 is transmitted to the swing frame 111 by pressing the load applying unit 121. [ In this embodiment, the thrust applied to the swing frame 111 by the fluid is about 2000N.

The applied axial thrust can be changed by adjusting the supply pressure of the working fluid, the gap between the counter plate 112 and the load applying unit 121, and the operating area.

The finishing unit 130 is configured to prevent exposure of one end of the swing frame 111 to the outside, and is spaced apart from one end of the swing frame 111. An opposite plate 122 is coupled to the surface of the finishing portion 130 facing the one end of the swing frame 111.

In addition, the finishing part 130 is formed with a discharge hole 131 through which the fluid supplied from the fluid supply part 123 can be discharged.

The axial thrust applying unit 120 and the finishing unit 130 may be installed at any position on the swing frame 111 at any position.

The concentricity and circularity of the outer circumferential surface of the fluid pressure journal bearing (114 of FIG. 2) located at both ends of the swing frame 111 and the concentricity of the inner diameter of the journal bearing 113 located at both outer ends of the swing frame 111 and A frictional loss occurs due to contact between the swing frame 111 and the journal bearing 113 due to the roundness, the manufacturing precision of other peripheral components, and the assembly error. Accordingly, an error occurs when measuring the torque value of the model aberration through the sensitivity measuring unit 140 described later.

However, when the axial thrust is applied using the hydraulic pressure as in the axial thrust applying unit 120 of the present invention, the axial thrust can be applied to the swing frame 111 without friction that occurs mechanically, so that the accuracy of the model aberration torque value Can be improved.

4 is a modification of the axial thrust applying device for the sensitivity test of the model aberration torque measuring system according to the present invention. Referring to FIG. 4, in the model aberration torque measuring system according to the present modification, the sensitivity testing axial thrust applying device 100 'includes an axial thrust applying part 120' and a finishing part 120 'at one end of a shaft on which a runner of a model aberration is mounted. (130 ').

Since the axial thrust is applied in the direction in which the runner of the swing frame 111 is mounted, the counter plate 122 'is not attached to the finishing portion 130' but the blade 121 ' So that the thrust can be applied.

The fluid supplied from the fluid supply unit 123 is applied with axial thrust to the swing frame 111 through the opposite plate 122 'and the load cell 124'. The fluid inside the fin 130 'is discharged to the outside through the discharge hole 131'.

5) of the swing frame 111. The sensitivity measuring unit 140 includes a pair of lever arms 141 provided on both sides in the radial direction of the swing frame 111, A pair of weights 142 as much as possible and a small weight 143 which is selectively placed on top of each weight 142.

The sensitivity measurement unit 140 may be used to perform a sensitivity test. Here, the sensitivity test is a test that quantitatively confirms whether the torque of the model aberration can be accurately measured in a state in which radial and axial thrust are applied to the swing frame 111 of the model aberration prior to the model aberration performance test.

5, the swing frame 111 is lifted by the journal bearing 113 to support the radial load, and the axial force applied by the axial force application unit 120 In a state of supporting the load, the weight 142 is suspended on the lever arm 141 extending in both directions from the axis line of the swing frame 111 so as to form an equilibrium.

In this state, by placing the additional minute weight 143 on one of the weights 142, the balance is broken and the swing frame 111 is inclined or rotated in the direction in which the minute weight 143 is raised.

The weight of the smallest minute weight 143 in this situation is confirmed and the weight is multiplied by the length (l) of the lever arm 141 hanging the weight 142 at the center of the axis of the swing frame 111, It is possible to obtain a value of the torque to be hit.

Hereinafter, the operation of the axial thrust applying device for sensitivity testing of the model aberration torque measuring system according to the first embodiment of the present invention will be described.

2, the load cell 124 and the load applying unit 121 are coupled to one end of the swing frame 111, and the end surface of the swing frame 111 and the load applying unit 121 are spaced apart from each other. And an opposite plate 122 is coupled to the inner surface of the finishing unit 130. [

Thereafter, fluid is supplied from the fluid supply unit 123 to the load application unit 121 side through the orifice 122a of the opposite plate 122. The load applying section 121 is subjected to the force by the fluid and the force is transmitted to the swing frame 111.

The load cell 124 measures the magnitude of the force applied to the swing frame 111 and controls the amount of fluid to be supplied so as to be 2000 N, which is the target axial thrust in the present embodiment. On the other hand, the fluid supplied into the finishing portion 130 is discharged to the outside through the discharge hole 131.

Then, after the axial thrust is applied to the swing frame 111, the sensitivity is measured through the sensitivity measuring unit 140. Referring to FIG. 5, a weight 142 is hung on a lever arm 141 extending in both directions perpendicular to the axis of the swing frame 111 so that equilibrium is achieved.

Then, an additional minute weight 143 is placed on the weight 142 on the right weight 142, and the variation of the lever arm 141 is measured.

When the shift of the lever arm 141 is sensed by the addition of the minute weight 143, the weight of the minute weight 141 at that time and the weight of the lever arm 141 hanging the weight 142 from the center of the swing frame 111 axis ) Is multiplied by the length (ℓ), which is the sensitivity level.

According to the present invention, the force can be applied to the load application unit 121 using the fluid, so that the axial thrust can be applied to the swing frame 111 without friction, Sensitivity testing of torque measurement systems may be possible.

Next, the axial thrust applying device for the sensitivity test of the model aberration torque measuring system according to the second embodiment of the present invention will be described.

The configuration of the axial thrust applying unit for the sensitivity test of the model aberration torque measuring system according to the second embodiment of the present invention is changed in comparison with that of the first embodiment.

6 is a schematic diagram of an axial thrust application device for sensitivity testing of a model aberration torque measurement system of the present invention.

Referring to FIG. 6, the sensitivity testing shaft force application device 200 of the model aberration torque measurement system according to the second embodiment of the present invention includes a load application unit 210, a magnetic body 220, a finishing unit 230, (240). Other configurations are the same as those of the first embodiment described above, and a detailed description thereof will be omitted.

The load applying unit 210 and the load cell are configured in the same manner as the load applying unit and the load cell of the first embodiment.

The magnetic bodies 220 are provided in pairs and are spaced apart from each other with a load applying unit 210 interposed therebetween to apply a force to the load applying unit 210 to apply a thrust force to the swing frame 111.

Specifically, the magnetic body 220 located on the outer side of the load application unit 210 of the pair of magnetic bodies 220 is coupled to the inner wall of the finishing unit 230 and is disposed inside the load application unit 210 The magnetic body 220 can be fixed by a predetermined fixing means.

The magnetic body 220 located inside the load applying unit 210 may be selectively movable in the inward and outward directions as required.

On the other hand, each of the magnetic bodies 220 is provided as an electromagnet, and is magnetized when an electric current flows, so that the strength of the magnetic field can be relatively easily changed.

Accordingly, the magnitude of the magnetic field of each magnetic body 210 can be individually controlled through the control unit, and the magnitude of the force applied to the load applying unit 210 can be adjusted by adjusting the magnitude of the magnetic field of the magnetic body 210 .

Here, the load applying unit 121 receives the attractive force due to the magnetic force from each of the pair of magnetic bodies 220, and receives the attractive force toward the opposite two magnetic bodies 220, It is possible to maintain a gap with each of the magnetic bodies 222 without being contacted anywhere.

In the present embodiment, the control is made so that the attraction force acts on the load applying unit 121, but it is also possible to perform control so that the repulsive force acts as needed.

The finishing portion 230 is coupled to surround one end of the swing frame 111 to prevent exposure of one end of the swing frame 111, as in the first embodiment. Unlike the first embodiment, no exhaust hole is formed.

When the control unit controls the magnetic bodies 220 to apply force to the load applying unit 210, the load applying unit 121 is separated from the magnetic bodies 222.

At this time, when the magnetic force of any one of the magnetic bodies 220 is controlled so as to act weaker, the load applying unit 210 moves to a weaker magnetic force, and the axial thrust can be applied to the swing frame 111.

As described above, by using the magnetic thrust applied to the swing frame 111, no additional friction may occur.

The scope of the present invention is not limited to the above-described embodiments, but may be embodied in various forms of embodiments within the scope of the appended claims. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.

100, 200: Thrust applicator for model aberration sensitivity test
110: measured part 120,220: axial thrust applying part
130, 230: Finishing section 140: Sensitivity measurement section

Claims (9)

A shaft thrust applying apparatus for a sensitivity test of a model aberration torque measuring system,
A measured portion including a swing frame of the model aberration and a housing disposed apart from an outer circumferential surface of the swing frame;
A sensitivity measuring unit installed on both outer sides of the swing frame in a radial direction from a shaft centerline of the swing frame to obtain the sensitivity torque value by adjusting the weight of either one of the two sides; And
And applying an axial thrust to the swing frame using a hydraulic or magnetic force. The apparatus for applying axial thrust to a swing frame of a model aberration torque measuring system according to claim 1, The method according to claim 1,
The axial thrust applying unit may include:
A load applying unit coupled to the swing frame;
An opposite plate opposed to the load applying unit and having an orifice formed therein; And
And a fluid supply unit for supplying a fluid to the orifice and applying an oil pressure to the load applying unit. 3. The method of claim 2,
Wherein the axis thrust applying portion further includes a finishing portion spaced apart from one end of the swing frame and preventing external exposure of one end of the swing frame,
And the opposite plate is mounted on the finishing unit. The axial thrust applying device for the sensitivity test of the model aberration torque measuring system. The method according to claim 1,
The axial thrust applying unit may include:
A load applying unit coupled to the swing frame; And
And a magnetic body for applying a load to the swing frame by applying a magnetic force to the load applying unit, wherein the pair of swinging units are disposed between the load applying units. 5. The method of claim 4,
And the pair of magnetic bodies are controlled so that the load applying unit and the attraction force are respectively applied to the shaft applying unit and the shaft applying unit for the sensitivity test of the model aberration torque measuring system. 5. The method of claim 4,
And the pair of magnetic bodies are controlled such that repulsive force acts on the load applying unit, respectively. The method according to claim 5 or 6,
Wherein the magnitude of the magnetic force of the pair of magnetic bodies is individually controlled. The method according to claim 2 or 4,
Wherein the axis thrust applying unit further includes a load cell. The method according to claim 1,
Wherein the sensitivity measuring unit comprises:
A pair of lever arms on both outer sides in the radial direction of the swing frame;
A pair of weights each of which is provided at an outer end of the pair of lever arms and is adjustable in weight; And
And a minute weight provided to weight one of the weights while the pair of lever arms are kept in equilibrium.
KR1020150153692A 2015-11-03 2015-11-03 Thrust applying apparatus for sensitive test of torque measurement system of model hydraulic turbine KR101761696B1 (en)

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KR101973540B1 (en) * 2018-05-08 2019-04-29 박민하 Apparatus for measuring deformation of inner surfaceor inside diameter of power conduit
CN109827696A (en) * 2019-04-01 2019-05-31 重庆交通职业学院 A kind of underwater robot propeller propulsion test device
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CN110207875B (en) * 2019-07-15 2020-11-13 北京遥感设备研究所 Double-layer rolling bearing friction torque testing device and testing method

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