KR20160137853A - Coefficient of friction, measuring device - Google Patents

Coefficient of friction, measuring device Download PDF

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Publication number
KR20160137853A
KR20160137853A KR1020150072045A KR20150072045A KR20160137853A KR 20160137853 A KR20160137853 A KR 20160137853A KR 1020150072045 A KR1020150072045 A KR 1020150072045A KR 20150072045 A KR20150072045 A KR 20150072045A KR 20160137853 A KR20160137853 A KR 20160137853A
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South Korea
Prior art keywords
sample
guide
guide ramp
friction
ramp
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KR1020150072045A
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Korean (ko)
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김병국
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(주)세계과학
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Priority to KR1020150072045A priority Critical patent/KR20160137853A/en
Publication of KR20160137853A publication Critical patent/KR20160137853A/en

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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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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The present invention relates to a friction coefficient measuring apparatus, and more particularly, to a friction coefficient measuring apparatus capable of measuring a coefficient of static friction and a coefficient of dynamic friction acting between surfaces of a sample (object) So that it is possible to adjust the inclination angle of the guide ramp smoothly without vibration such as vibration as well as to prevent the sample from being released to the outside when sliding the sample on the inclined guide ramp, A coefficient measuring device is provided.
In order to achieve the above object, the present invention is characterized in that a guide groove (111) for inserting a sample is formed at one end, a catching wall (112) for preventing the sample from being separated by continuous movement is formed inside the other end, A guide rail 114 is formed on the left and right sides of the friction plate 113 to prevent the sample from being detached to the outside. One end of the angle adjusting means A guide ramp 110 having a connection bracket 115 hinged thereto; A guide pedestal 120 for supporting one end of the guide ramp 110 in a hinged manner to support the guide ramp 110 so as to be rotated up and down; A dowel 131 mounted on the other end of the guide ramp 110 and having a rope 3 to which a sample 1 and a sparger 2 are connected is provided at one end and the other end, A clamp 130 having a screw knob 132 for fixing it; And an angle adjusting means 140 provided at the center between the guide ramp 110 and the guide pedestal 120 for adjusting the inclination angle by vertically moving the guide ramp up and down .

Description

[Technical Field] The present invention relates to a friction coefficient measuring device,

The present invention relates to a friction coefficient measuring apparatus, and more particularly, to a friction coefficient measuring apparatus capable of measuring a coefficient of static friction and a coefficient of dynamic friction acting between surfaces of a sample (object) So that it is possible to adjust the inclination angle of the guide ramp smoothly without vibration such as vibration as well as to prevent the sample from being released to the outside when sliding the sample on the inclined guide ramp, A coefficient measuring device is provided.

The coefficient of friction is the ratio of the magnitude of the frictional force F (the maximum static frictional force in the case of static friction) to the magnitude P of the perpendicular force μ = F / P. The horizontal force required to keep the specimen (object) sliding on the surface moving constantly divided by the force acting on its surface, usually denoted by the Greek letter μ (mu).

There are two types of friction coefficient: static friction coefficient giving the relation between maximum static friction force and vertical force, and kinetic friction coefficient giving the relationship between kinetic friction force and vertical force. At this time, the kinetic friction coefficient is generally smaller than the static friction coefficient. The kinetic friction coefficient can be divided into the sliding friction coefficient when sliding again and the rolling friction coefficient when rolling motion. And the rolling friction coefficient is divided into the stop rolling friction coefficient at the start of rolling in the stop state and the rolling roll friction coefficient during rolling.

On the other hand, as for the method of measuring the static friction coefficient and the kinetic friction coefficient, it is preferable to measure the balance scale just before the sample moves by dragging the sample with the spring scale while changing the mass of the sample, Is to measure the angle just before the sample slips when tilted slowly.

The conventional friction coefficient measuring apparatus for measuring the static friction coefficient and the kinetic friction coefficient as described above includes a friction plate 10 on which the sample 1 is placed and closely contacted and a friction plate 10 on which the friction plate 10 is sloped up and down A support jack 13 for hinging a plurality of connecting rods so as to move the ramp 11 up and down so as to adjust the height by rotating the operating knob 12 left and right, A protractor 14 for indicating a tilted angle of inclination of the ramp, and a pulley 15 for covering the rope connected to the sample 1.

However, in the conventional incline, only the friction plate 10 having a flat surface at the upper end is provided, and the inclined stage 11 is tilted at a predetermined angle with the object placed on the friction plate 10 to measure the coefficient of dynamic friction, In the course of sliding the sample 1 to the outside.

In addition, when the support jack 13 is moved upward and downward to adjust the inclination angle of the inclined stage 11, a vibration such as vibration occurs and the sample 1 is shaken when the sample 1 slides on the inclined friction plate 10 There is a problem that accurate measurement can not be performed.

In addition, there is a problem in that the experiment is not performed because the bowl 15 is fixed and the sample having various sizes and heights can not be used.

Conventionally, the sample 1 for measuring the friction coefficient can only measure the same material with a fixed weight, and therefore, the sample itself has to be replaced when the weight is different.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art as described above, and it is an object of the present invention to provide a clamping device, The second object of the present invention is to provide a friction coefficient measuring apparatus and a friction coefficient measuring method which are capable of accurately measuring the frictional coefficient of the friction stirrer in a state in which a guide rail is formed on the left and right sides of the guide- The third object is to move the holder upward and downward by rotating the lead screw of the angle adjusting means to adjust the inclination angle of the guide ramp, The guide rails can be steadily and smoothly moved up and down to adjust the tilt angle. And the fourth object is to adjust the height according to the type of the sample having different sizes and heights by moving the drill provided in the clamp up and down and the fifth object is to provide a fixing pin The insertion hole formed in the weight is detachably inserted so as to increase the weight of the sample so that the same material sample can be measured with various weight changes.

In order to accomplish the above object, the present invention provides a friction stir welding tool comprising a guide groove for inserting a sample at one end, a catching wall for preventing the sample from being separated by continuous movement, and a friction plate A guide rail is formed on the left and right sides of the friction plate to prevent the sample from being detached to the outside, and a guide ramp is formed on the lower end of the center, with a connecting bracket hinged to one end of the angle adjusting means. A guide pedestal for supporting and supporting one end of the guide ramp so that the one end of the guide ramp is hinged and rotates upward and downward; A clamp bolt mounted on the other end of the guide ramp and provided with a pulley on which a rope to which a specimen and a pawl hook are connected is wound on one end and the other end, respectively, and a screw knob for fixing the pulley; And angle adjusting means provided at the center between the guide ramp and the guide pedestal for adjusting the inclination angle by vertically moving the guide ramp up and down.

According to the present invention, since the sample (object) is inserted into the guide groove of the guide ramp and is slid along the guide rail while being in close contact with the friction plate, it is possible to prevent the object from being released to the outside.

In addition, by adjusting the inclination angle of the guide ramp by moving the holder upward and downward by rotating the lead screw of the angle adjusting means, it is possible to adjust the inclination angle by moving the guide ramp up and down stably and smoothly, will be.

The pulley provided in the clamp can be moved up and down so that the height can be adjusted according to the type of the sample having different sizes and heights.

In addition, by inserting the insertion hole formed in the weight weight into the fixing pin provided in the sample in a detachable manner, the weight of the sample is increased, so that a sample of the same material can be measured without any replacement, .

1 is a side view showing a conventional friction coefficient measuring apparatus.
FIG. 2 is a perspective view of a friction coefficient measuring apparatus according to the present invention, in which a guide ramp is horizontally disposed. FIG.
3 is a perspective view showing a state in which a guide ramp of an apparatus for measuring a friction coefficient according to the present invention is moved upward to provide an inclined angle.
4A and 4B are side views showing a state in which the dolly of the friction coefficient measuring apparatus according to the present invention is adjusted in height according to the size and height of the sample.
FIG. 5 is a side view showing a state in which an inclination angle of the inclination of the apparatus is shifted upward by the friction coefficient measuring apparatus according to the present invention. FIG.
6 is a perspective view showing a state in which the angle of the pulley is adjusted by separating the screw knob of the clamp according to the present invention.
FIG. 7 is a perspective view showing a state in which an insertion hole is formed in a fixing pin of a sample according to the present invention, and the weight is additionally detached; FIG.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

1 and 2, a friction coefficient measuring apparatus 100 according to the present invention includes guide grooves 111 through which a sample 160 is inserted at one end and a sample 160 is formed inside the other end, A sample 160 is attached to the left and right sides of the friction plate 113. The friction plate 113 is fixed to the bottom surface of the friction plate 113, A guide rail 114 for preventing the guide bracket 115 from being detached to the outside and a guide ramp 110 having a connecting bracket 115 hinged to one end of the angle adjusting means are formed at the lower center of the guide rail.

In addition, the outer side of the other end of the guide ramp 110 is provided with a protractor 116 for indicating the angle of the ramp angle when the guide ramp 110 is rotated upward so as to form an inclination angle.

Meanwhile, it is preferable that the guide slope 110 is made of light and durable aluminum.

Further, it is preferable that the angle of the inclination angle of the guide ramp 110 is adjustable from 0 to 40 degrees.

A guide pedestal 120 is hinged to support one end of the guide ramp 110 so as to support the guide ramp 110 so as to be rotated up and down.

At this time, a pair of supports 121 protruding from the lower end of the guide ramp 110 to support the lower end of the guide ramp 110 so as to support the guide ramp 110 horizontally is formed at one end of the guide base 120.

The rotation guide plate 150 may be disposed between the guide ramp 110 and one end of the guide bracket 120 to hinge the guide ramp 100 so that the guide ramp 100 is rotated by the guide pedestal 120.

The dredger 131 is bolted to the other end of the guide ramp 110 and has a rope 3 to which the sample 160 and the weight 2 are connected at one end and the other end, And a clamp 130 provided with a screw knob 132 for fixing the bowl 131.

The angle adjusting unit 140 is disposed at the center between the guide ramp 110 and the guide pedestal 120 and adjusts the inclination angle by moving the guide ramp 110 up and down.

At this time, one end of the angle adjusting means 140 is provided with a holder 141 having a screw groove 142 formed at an inner center thereof, and the other end thereof is engaged with the screw groove 142 to be rotated up and down by a lead screw 143 And one end of the holder 141 is rotatably hinged to a connection bracket 115 formed on the guide ramp 110. A pair of supports 121 are provided at the end of the lead screw 143, And an operating knob 145 which is fixed at the center between the holder 141 and the holder 141 and rotates the lead screw 143 to move the holder 141 upward or downward.

A fixing pin 161 protrudes from the center of the sample 160 to detachably mount a weight 162 for increasing the weight of the sample. An insertion hole 162a is formed so as to be inserted as much as possible.

Hereinafter, the method of using the friction coefficient measuring apparatus constructed as described above and the operation and effect will be described.

2, when the frictional coefficient is measured using the frictional coefficient measuring apparatus 100 according to the present invention, the guide rails 110 are horizontally disposed in the guide grooves 111, The sample 160 is inserted into the friction plate 113 so as to be in close contact with the friction plate 113.

Then, the operating knob 145 of the angle adjusting means 140 is rotated in the clockwise direction so that the guide ramp 110 is rotated about the hinge axis mounted on the guide pedestal 120 and the opposite end is raised upward, And the angle at which the sample 160 starts to slide down on the friction plate 113 is measured to obtain the coefficient of static friction.

3, when the friction coefficient is measured using the friction coefficient measuring apparatus 100 according to the present invention, the guide rails 110 are horizontally disposed, The sample 160 is inserted into the guide groove 111 in a state of being installed so as to be in tight contact with the friction plate 113.

Then, the operating knob 145 of the angle adjusting means 140 is rotated in the clockwise direction so that the guide ramp 110 is rotated about the hinge axis mounted on the guide pedestal 120 and the opposite end is raised upward, The initial speed and acceleration are calculated by measuring the moving speed at which the sample 160 slips down the friction plate 113 while calculating the initial speed and acceleration.

4A and 4B, when the friction coefficient is measured using the friction coefficient measuring apparatus 100 according to the present invention, the friction plate 113 of the inclined guide 110 One end of the rope 3 is connected to the sample 1 placed on the drum 131 and the other end is attached to the weight 2 so that the sample 160 is moved by the weight of the weight 2 to the friction plate 113 ), And calculate the initial speed and acceleration by measuring the speed of movement.

Then, the surface of the sample 160 is replaced with another sample, and the above-described experiment is repeated. 6, when the sample 160 is replaced, the height of the bowl 131 is adjusted according to the size and height of the sample 160 as shown in FIG. 6, The screw knob 132 fixing the knob 131 is loosened to adjust the angle of the knob 131 and then the screw knob 132 is tightened to fix the knob 132 again.

7, in the process of measuring the friction coefficient of the sample 160 having any one material and weight, the material of the sample 160 is changed in the same state only by changing the weight of the sample 160 When performing the friction coefficient measurement experiment, the weight of the sample 160 is adjusted by attaching or removing one or more weight weights 162 to the fixing pins 161 provided in the sample 160 .

That is, since the sample 160 is inserted into the guide groove 111 of the guide ramp 110 and is slid along the guide rail 114 while being in tight contact with the friction plate 113, (160) is prevented from being deviated to the outside.

The inclined angle of the guide ramp 110 is adjusted by rotating the lead screw 143 of the angle adjusting means 140 to move the holder 141 upward and downward, So that the inclination angle can be adjusted by moving the movable member 110 up and down.

The drum 131 provided on the clamp 130 can be moved up and down so that the height of the drum 130 can be adjusted according to the type of the sample 160 having different sizes and heights.

In addition, the insertion hole formed in the weight is detachably inserted into the fixing pin provided on the sample to increase the weight of the sample, so that the sample of the same material can be measured with various weight changes without any additional replacement .

The technical idea of the friction coefficient measuring apparatus of the present invention is that the same results can be repeatedly practiced. Particularly, by implementing the present invention as described above, it is possible to contribute to industrial development by promoting technological development,

100 - Coefficient of friction measuring device 110 - Guide ramp
120 - Guide stand 130 - Clamp
140 - Angle adjusting means 150 - Rotary connection plate
160 - Sample

Claims (5)

A guide groove 111 for inserting a sample is formed at one end and a catching wall 112 for preventing the sample 160 from being separated by continuous movement is formed at the other end of the sample. A guide rail 114 is formed on the left and right sides of the friction plate 113 to prevent the sample 160 from being released to the outside. A guide ramp 110 formed with a hinge-mounted connection bracket 115;
A guide pedestal 120 for supporting one end of the guide ramp 110 in a hinged manner to support the guide ramp 110 so as to be rotated up and down;
A dowel 131 mounted on the other end of the guide ramp 110 and having a rope 3 connected to the sample 1 and the lug 2 at one end and the other end, A clamp 130 having a screw knob 132 for fixing the screw 130; And
And an angle adjusting means 140 provided at the center between the guide ramp 110 and the guide pedestal 120 for adjusting the inclination angle by vertically moving the guide ramp upward and downward. Device.
The method according to claim 1,
And a rotation connecting plate 150 for hinging the guide ramp 100 to the guide base 120 so as to be rotatable is further provided between the guide ramp 110 and one end of the guide base 120 Friction coefficient measuring device.
The method according to claim 1,
Wherein the pulley (131) provided on the clamp (130) is movable upward and downward to adjust the height according to the kinds of samples having various sizes and heights.
The method according to claim 1,
A lead screw 143 is provided at one end of the angle adjusting means 140 and a holder 141 having a screw groove 142 formed at an inner center thereof and at the other end thereof to be engaged with the screw groove 142 to be rotated up and down. Respectively,
One end of the holder 141 is rotatably hinged to a connection bracket 115 of a guide ramp and a lead screw is rotated at one end of the lead screw 143 to move the holder upward and downward Wherein an operating handle (144) is provided.
The method according to claim 1,
The weight 160 is provided at the center of the sample 160 with a fixing pin 161 for detachably mounting a weight 162 for increasing the weight of the sample. (162a) is formed on the outer circumferential surface of the friction material.
KR1020150072045A 2015-05-22 2015-05-22 Coefficient of friction, measuring device KR20160137853A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101991890B1 (en) * 2018-10-19 2019-06-21 주식회사 한국구조물안전연구원 Height and transform measuring device of elastic support installed on bridge
CN110261299A (en) * 2019-08-01 2019-09-20 广州市机电高级技工学校（广州市机电技师学院、广州市机电高级职业技术培训学院） A kind of elevator door friction coefficient measuring apparatus
CN110595659A (en) * 2019-10-15 2019-12-20 塔里木大学 Multifunctional pull-out force measurement test bed
KR102253619B1 (en) * 2019-12-05 2021-05-20 한국철도기술연구원 Measurement system of friction between capsule train and guide wire in the partial vacuum tube
CN112998358A (en) * 2021-03-02 2021-06-22 潘迎迎 Sole anti-skidding performance testing device for footwear detection
CN114778435A (en) * 2022-04-06 2022-07-22 重庆交通大学 Experimental device for be used for simulating gliding of rock block
CN115180347A (en) * 2022-08-11 2022-10-14 启东辰乔智能科技有限公司 Rotary lifting belt conveyor

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101991890B1 (en) * 2018-10-19 2019-06-21 주식회사 한국구조물안전연구원 Height and transform measuring device of elastic support installed on bridge
CN110261299A (en) * 2019-08-01 2019-09-20 广州市机电高级技工学校（广州市机电技师学院、广州市机电高级职业技术培训学院） A kind of elevator door friction coefficient measuring apparatus
CN110595659A (en) * 2019-10-15 2019-12-20 塔里木大学 Multifunctional pull-out force measurement test bed
KR102253619B1 (en) * 2019-12-05 2021-05-20 한국철도기술연구원 Measurement system of friction between capsule train and guide wire in the partial vacuum tube
CN112998358A (en) * 2021-03-02 2021-06-22 潘迎迎 Sole anti-skidding performance testing device for footwear detection
CN114778435A (en) * 2022-04-06 2022-07-22 重庆交通大学 Experimental device for be used for simulating gliding of rock block
CN115180347A (en) * 2022-08-11 2022-10-14 启东辰乔智能科技有限公司 Rotary lifting belt conveyor
CN115180347B (en) * 2022-08-11 2024-03-26 启东辰乔智能科技有限公司 Rotary lifting belt conveyor

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