TWM580679U - Device for measuring the friction coefficient - Google Patents

Abstract

The present invention provides a friction coefficient testing device comprising: a body device including There is a load frame body and a sensing frame body. The load frame system has a connecting end and a first end end. The connecting end is connected to the sensing frame body. The sensing frame system is arranged in an upright manner, and includes a connection. a first sensing frame and a second sensing frame, the bottom end of the second sensing frame is a second end; a positioning device is disposed at the second end of the frame device, The positioning device includes a positioning seat for positioning a needle body for measuring operation; a supporting device having a supporting base, the supporting seat system being connected to the loading frame body a strain sensing device disposed on the second sensing frame of the sensing frame body, the strain gauge having a wire electrically connected to a strain indicating recorder; thereby The friction coefficient test for the needle body has excellent measurement accuracy, and is easy and convenient to use, and is easy to manufacture and realize economic benefits by the simple design of its overall structure.

Description

Friction coefficient test device

The present invention relates to a test device, in particular to a friction coefficient which is obtained by utilizing a change in resistance value caused by a frictional force of a needle body to enable measurement of a friction coefficient thereof, and having excellent ease of operation and economic efficiency. Test device.

Due to changes in life and diet, modern people have become the fastest chronic disease with an increasing rate of diabetes, and one person dies of diabetes every 6 seconds. In order to control the occurrence and deterioration of diabetes, the International Diabetes Federation (IDF) and physicians all over the world hope that people can use the blood glucose machine for self-monitoring.

According to different principles, the conventional blood glucose testing technology can be divided into two types: invasive and non-invasive, and various types of equipment are developed. After many factors after experiment and actual operation, the current more commonly used invasive blood glucose test The technology is the main, and the blood glucose meter has been developed into a portable, inexpensive device, such as a blood collection pen, so that the operation of measuring blood sugar can be carried out simply and quickly.

Since the blood collection pen is an invasive device developed by invasive blood glucose detection technology, it is necessary to quickly puncture the blood to the lower layer of the skin to take out the blood, so that pain is generated during the puncture, and the pain mainly includes pain generated after puncture and after puncture. The pain of the wound also causes the user's psychological stress and negative emotional reactions. The design of the blood collection pen will affect the index of pain. In order to reduce the pain caused by the puncture, the prior art has been researched and improved for some projects, including: (1) coating the surface of the blood collection needle Special materials are used to reduce the friction between the blood collection needle and the skin, and reduce the pain; (2) change the shape of the blood collection needle tip and the angle of the slope to make the wound produced by the puncture smaller; (3) patients for different skin conditions Use a blood collection device that can adjust the depth of the puncture or a small blood collection needle; (4) Change the mechanism design of the blood collection device to slow the vibration of the blood collection needle and the area of the wound. It can be seen that there are a number of technologies to be further developed to reduce the pain of blood collection pen puncture.

The frictional force generated during the puncture of the needle used by the blood collection pen, and the connection considerations of the surface composition of the needle, the selection of materials and related applications, make it necessary for the R&D personnel in this industry to understand the technology development and testing research. The use of the frictional force and friction coefficient of the needle body can make the research content of the pain index more accurate and accurate.

A related art of the friction coefficient of a test object is the invention patent No. I343993 for providing an "object friction coefficient measuring device". The disclosure includes a base, a reference test plane, an actuating device, an object movement sensing module, a control module and a tilt measuring device; the reference test plane is for placing an object on both sides thereof a guide rail is disposed, and a roller is disposed on the two sides of the object, and the roller is respectively attached to the guide rail. The actuating device is connected to the reference test plane for driving the reference test plane to be inclined with respect to a horizontal plane. The object movement sensing module is configured to sense whether an object placed on the reference test plane moves, and generate a mobile signal when the object starts to move, and the control module is based on the mobile signal Controlling the motor to stop, the inclination measuring device is configured to measure the inclination angle of the reference test plane, so that the user can calculate the static friction coefficient of the object relative to the reference test plane according to the inclination angle, and can be utilized with the spring setting Functional principle, the dynamic friction coefficient is obtained by the relationship between the elastic position energy and the friction loss. However, this conventional technique will bring the rollers on both sides of the animal body when the object moves, so that when the friction coefficient is calculated, in addition to the friction coefficient of the object, the influence of the roller friction rail is also added, so that a large error occurs. And can't measure accurately; in addition, because it puts the object on the benchmark plane and uses the tilt of the benchmark plane Angle transformation, to measure the movement signal of the object to measure the friction coefficient, obviously does not apply to the measurement of the tiny round rod body of the needle body, and the accuracy of the measurement will not meet the demand.

Patent No. I359266 for providing an "electronic object friction coefficient measuring device". Based on the structure of the invention patent No. I343993, a signal processing module electrically connected to the angle sensing module and the object movement sensing module is used for receiving and processing the angle signal and the mobile signal. Determining, by the mobile signal, the angle sensing module to generate the angle signal, and determining an inclination angle value of the reference test plane relative to a horizontal plane according to the angle signal, and calculating an object relative to the reference test plane according to the tilt angle value. Static friction coefficient. However, similarly, this prior art does not discriminate the influence of the roller friction rail when the object moves, and at the same time does not apply to the measurement of the tiny round rod body of the needle body.

The techniques for testing the friction coefficient of the test object are as described in patents I461682, M479414, etc., but such conventional techniques are mainly directed to a flat film, sheet, layer or plate, etc., and cannot be used for such a small round rod such as a needle. Measurement of the body. Moreover, the existing equipment that can include the measuring needle body is often complicated and very expensive, and can be undertaken by non-small units or individual academic research, testing and research, and the like, and it is necessary to solve and improve.

Therefore, the creator has the knowledge that the friction coefficient of the test object is not suitable for the shortcomings of the needle body and the fact that the structure design is not ideal. The creator of the case started to develop and conceive its solution, hoping to Developed a friction coefficient test device with excellent measurement accuracy, ease of use and cost-effectiveness to serve the public and promote the development of this industry.

The purpose of the present invention is to provide a friction coefficient testing device which can provide an excellent measurement accuracy for the friction coefficient test of the needle body, and is relatively simple and convenient to use, and is easy to design by its overall configuration. Manufacturing and implementation of its economic benefits.

The technology used to achieve the above purpose includes: a body device comprising a load frame body and a sensing frame body, the load frame system having a connecting end and a first end end, the connecting end connecting the sensing a frame body, the sensing frame system is arranged in an upright manner, and includes a first sensing frame and a second sensing frame connected to each other, and a bottom end of the second sensing frame is a second supporting end; a positioning device is disposed at the second end of the frame device, the positioning device includes a positioning seat for positioning a needle body for measuring operation; and a supporting device having a support base, the support base is connected to the first end of the load frame; a strain device is disposed on the second sensing frame of the sensing frame, the strain gauge has A wire that is electrically connected to a strain indicator recorder.

In the technical embodiment of the present invention, the load frame body and the sensing frame system are integrally formed by a long plate body.

In a technical embodiment of the present invention, a bent portion is coupled between the first sensing frame and the second sensing frame.

In the technical embodiment of the present invention, the strain device is a strain gauge, and the strain indicator recorder is connected to a host.

In the technical embodiment of the present invention, the sensing frame system is disposed in a U-shaped long plate body, and the load frame body is provided with a load zone at one of a horizontal distance between the first end end and the second end end. The load zone is used to set a load.

In the technical embodiment of the present invention, the positioning device further includes a positioning cover for pressing the needle body during the setting measurement operation.

In the technical embodiment of the present invention, the positioning seat or the positioning cover is provided with a needle groove.

In the technical embodiment of the present invention, a positioning portion is disposed at the rear end of the positioning device, and the positioning portion is fixed to the second sensing frame, and the positioning seat is provided with a recessed groove at the positioning portion for The embedded positioning of the second sensing frame.

In the technical embodiment of the present invention, the positioning seat and the positioning cover are respectively fixed to a hinge body on one side, so that the positioning cover 23 is covered and lifted relative to the positioning seat.

In the technical embodiment of the present invention, at least one positioning screw hole is disposed on one end surface of the positioning seat, and the positioning cover is provided with a through screw hole opposite to the positioning screw hole, and the through screw hole is provided with a positioning screw. The screw portion of the positioning screw is screwed to the through screw hole.

In the technical embodiment of the present invention, the support base is provided with a support fixing member coupled to the first end of the load frame body for supporting the load frame body.

In the technical embodiment of the present invention, the support base body is provided with a longitudinal rod portion, and the longitudinal rod portion is provided with a longitudinal groove for slidingly positioning the support fixing member for adjusting the height of the support fixing member.

In a technical embodiment of the present invention, the strain gauge includes a sheet-type carrier, and the carrier is provided with a metal guide piece group in a zigzag parallel arrangement in a grid line, and the lead terminal of the metal guide group is connected to the A wire, the strain gauge cover is provided with a protective cover member.

In the technical embodiment of the present invention, the method further includes a rubber gasket which is disposed on a table, and the rubber gasket is pulled by a slow speed motor.

In the technical embodiment of the present invention, the glue gasket is a crepe film, and the retarder motor is connected to the crepe film by a line body, and the needle body is flatly attached to the crepe film during the measuring operation.

10‧‧‧ ‧ Body device

20‧‧‧ Positioning device

30‧‧‧Support device

40‧‧‧ strain frame, strain gauge

11‧‧‧Load frame

12‧‧‧Sensor frame

111‧‧‧Link end

112‧‧‧first end

113‧‧‧Load zone

121‧‧‧First sensor stand

122‧‧‧Second sensor stand

123‧‧‧Bending

124‧‧‧Second end

200‧‧‧ load

21‧‧‧ Positioning Block

211‧‧‧ needle slot

22‧‧‧ Positioning Department

212‧‧‧Inlay

23‧‧‧ Positioning cover

233‧‧‧Spiral firmware

231‧‧‧ needle slot

24‧‧‧Chain

213‧‧‧ Positioning screw holes

232‧‧‧through screw holes

25‧‧‧ Positioning screw

251‧‧‧ Screw Department

252‧‧‧ handle

31‧‧‧Support body

32‧‧‧Support fixtures

33‧‧‧ longitudinal pole

331‧‧‧Longitudinal slot

41‧‧‧ Carrier

42‧‧‧Metal Guide Set

421‧‧‧Connecting terminal

43‧‧‧ protective cover

44‧‧‧ wire

50‧‧‧Strain indicator recorder

51‧‧‧Host

100‧‧‧ needle

101‧‧‧Glue gasket

102‧‧‧Desktop

60‧‧‧ Slow speed motor

61‧‧‧Line body

Figure 1 is a perspective view of the structure of the creation; Figure 2 is a partial exploded view of the creation; Figure 3 is a side view of the combination of the creation; Figure 3A is a partial side view of the creation; Figure 3B For the purpose of creating a schematic diagram of a variation of the positioning device 20; FIG. 4 is a schematic diagram of the creation of the strain gauge; FIG. 5 is a schematic diagram of the transmission of the strain gauge signal; and FIG. 6 is a schematic diagram of the creation test operation.

In order to enable the reviewers to have a better understanding and understanding of the characteristics of the creation and the effectiveness achieved, please refer to the examples and supporting instructions for the following: please refer to Figures 1, 2 and 3, 3A for Description This is a composition of a friction coefficient testing device. As shown, it includes a body device 10, a positioning device 20, a support device 30, and a strain device 40. The frame device 10 includes a load frame body 11 and a sensing frame body 12, in a suitable embodiment. The load frame body 11 and the sensing frame body 12 can be integrally formed by a long plate body; the load frame body 11 has a connecting end 111 and a first supporting end 112, and the load frame body 11 is horizontally disposed. The sensing frame body 12 is connected to the sensing frame body 12. The sensing frame body 12 is vertically erected, and includes a first sensing frame 121, a second sensing frame 122 and a connection first sensing. The frame 121 and the bent portion 123 of the second sensing frame 122; in other words, the sensing frame 12 is disposed in a U-shaped long plate body, and the bottom end (free end) of the second sensing frame 122 is It is a second end 124 of the frame device 10 (sensing frame 12). Furthermore, the The load frame 11 is provided with a load zone 113 at one of a horizontal distance between the first end 112 and the second end 124. The load zone 113 is used to set a load (weight) during the measurement operation. 200.

The positioning device 20 is disposed on the second end 124 of the frame device 10 (the sensing frame 12). The positioning device 20 includes a positioning seat 21 for positioning a measuring operation. The needle body 100 is provided with a positioning portion 22 at the rear end of the positioning device 20, and is fixed to the second end 124 of the sensing frame body 12 by the positioning portion 22, such as by screwing the screw 221 for screwing and fixing. And the positioning seat 21 is provided with a recess 212 at the positioning portion 22 for inserting and positioning the second sensing frame 122 to increase the stability thereof; a positioning cover 23, the needle body for the equivalent measuring operation When the 100 is placed on the positioning base 21, the positioning needle body 100 is pressed by the positioning cover 23 and fixed to the positioning base 21, for example, by screwing the screw 233 for screwing and fixing. In a suitable embodiment, the positioning seat 21 is provided with a pin slot 211 for conveniently positioning the needle body 100, and a positioning groove 23 is also provided on the surface of the positioning cover 23 to facilitate the cover. The needle body 100 is positioned, but is not limited.

Please refer to FIG. 3B , which is a modified embodiment of the positioning device 20 . As shown in the figure, the difference is that the positioning seat 21 and the positioning cover 231 are respectively fixed to a hinge 24 on one side. By means of the pivoting activity of the hinge 24 itself, the positioning cover 23 can be relatively closed and lifted relative to the positioning seat 21, and a positioning screw hole 213 is disposed on one end surface of the positioning seat 21, and The positioning cover 23 is provided with a through screw hole 232. The through screw hole 232 is provided with a positioning screw 25, and the screw portion 251 of the positioning screw 25 is screwed on the through screw hole 232. When the needle body is disposed at the positioning When the seat 21 (the needle groove 211) is placed, the positioning cover 23 can be relatively closed and the handle portion 252 of the positioning screw 25 is screwed and fixed to the positioning seat 21 for positioning the needle body.

The supporting device 30 has a supporting base 31. The supporting base 31 is slightly T-shaped, but not limited thereto. The supporting base 31 is provided with a supporting fixing member 32, so that the supporting frame 11 is One end The support frame 32 is fixedly disposed on the support fixing member 32, such as a screw connection, for supporting the load frame body 11; the support base body 31 is provided with a longitudinal rod portion 33, and the longitudinal rod portion 33 is provided with a longitudinal groove 331. The longitudinal slot 331 can slidably position the support fixing member 32 for adjusting the height of the support fixture 32 for adjusting the horizontality and height position of the load frame body 11, so that the first state can be matched with the environment state to make the first The support end 112 and the second end end 124 maintain a horizontal measurement operating position.

Referring to FIG. 4 , the strain device 40 is disposed on the second sensing frame 122 of the sensing frame 12 . In the embodiment, the strain device 40 is illustrated by a strain gauge. The strain device 40 can also be other devices that can be used to generate a change in resistance value by stretching, and is not limited. The strain gauge 40 includes a sheet-shaped carrier 41 having a metal guide piece set 42 in a zigzag-shaped parallel arrangement in the form of a grid, and the metal guide group 42 (strain gauge 40) is guided. A terminal 44 is connected to the terminal 421. In a suitable embodiment, the strain gauge 40 is contacted (eg, glued) on the second sensing frame 122, and the strain gauge 40 is covered with a shield member 43 (refer to FIG. 1). The relative to-be-tested part of the strain gauge 40 is a second sensing frame 122 that is elongated or shortened with the second sensing frame 122 (the member to be tested), and the resistance value of the strain gauge 40 when it is extended or shortened With the change, the change of the resistance value can be measured by the Wheatstone bridge or the Strain Indicator and Record, and the strain value can be obtained, so that the linear change occurs in the electron-resistance.

Since different metals and different materials have different strain coefficients K, the strain gauge label used in this embodiment is MEMAX Tech.NMB Strain Gauges, model J-6-35T11W3MS, and the K value (GF) is 2.04±1%. .

Referring to FIG. 5 , the strain gauge 40 is electrically connected to a Strain Indicator and Recorder 50 , and the strain indicator recorder 50 is electrically connected to a host 51 . The strain gauge 40 produces a very small change in resistance, so the output measured by the strain gauge recorder 50 is used. The signal "Micro Strain-/Micro Strain" is converted to a measurement of resistance change. This embodiment is measured by the Elogger system of Memstect.Corp., such as Eloger (Strain Indicator and Record), which is used as a bridge amplifier for reading and measuring applications, and reads per channel per second. Taking 10,000 times, the operator can select the rate recorded data to be stored on the removable flash card and stored, reduced and displayed by transmission to the host 51 for subsequent software.

Please refer to FIG. 6 together. When the test friction coefficient test device is used for testing, a glue pad 101 is placed on a table 102, which can be a film, which is slowed down. The motor 60 is pulled in linkage, and the retarder motor 60 is connected to the rubber gasket 101 by a wire body 61 (such as a cotton thread, but not limited thereto). The needle body 100 (such as an injection needle) is placed on the positioning film 21 after being positioned on the positioning block 21, and a load 200 is set in the load area 113. At this time, the slow speed motor 60 is activated. The rubber spacer 101 is slowly pulled outward at a slow speed (for example, a speed of 0.01 m/s), and the second sensing frame 122 is also subjected to a slight external force so as to be attached to the second sensing frame 122. The strain gauge 40 generates a "strain" (in "micro-strain") signal due to the deformation of the stressed material, and then transmits the signal to the Elogger/Strain Indicator Recorder 50 to display and record the "strain" amount. At this time, the friction generated between the needle body 100 and the rubber gasket 101 is a static friction force. The apex of the instantaneous drop until the signal rises to the highest point is the "micro-strain" at the "maximum static friction (Fxs)" between the needle 100 and the rubber gasket 101. After the descent, the strain is almost constant. At this time, the rubber gasket 101 starts to move, and the measured signal is the "micro-strain" when the "moving friction force (Fxk)" between the needle body 100 and the rubber gasket 101.

The calculation of the friction coefficient test device of the present invention is described below. When the elastic modulus of the object material is known, the stress is calculated based on the strain gauge 40. Therefore, the strain is measured to calculate the stress generated by the action of the external force. The calculation formula is as follows:

R: strain gauge original resistance value (Ω)

△R: resistance change in elongation or contraction (Ω)

K: proportional constant / strain coefficient

ε : strain

Because different metals have different strain coefficients K, the strain gauge label used in this example is MEMAX Tech.NMB Strain Gauges, model J-6-35T11W3MS, and the K value (G.F) is 2.04±1%. The output signal measured by Eloger (Strain Indicator and Record) is "Micro Strain-/micro strain", and the strain is converted into a measurement of resistance change.

When the resistance change of 1000 x 10 ^-6 is tested in this embodiment, the strain gauge used is 350 Ω ΔR / 350 Ω = 2.04 x 1000 x 10 ^-6

△R=350Ωx2.04x1000x10 ^-6 =0.714Ω..............................Formula 1

Resistance change rate: △R/R=0.714/350=2.04 x 10 ^-3

The amount of micro strain measured by the strain indicating recorder 50 can be converted into the amount of change in resistance, that is, ΔR = 350 Ω x 2.04 x ε (the amount of strain - that is, the measured value)

The needle body 100 (the needle diameter is 1.2mm, 0.8mm and 0.5mm) of each friction force to be tested is added with different load 200 (100g, 200g weight), and the measured maximum static friction force (Fxs) and dynamic friction force are measured. The "microstrain" at (Fx1k) is substituted into Equation 1 (1 Micro Strain = 0.714 Ω), and the resistance (Fxs, Fxk) of the needle body 100 to be tested is obtained (see Figs. 3 and 6).

According to Newton's law: torque = force * force arm (ie L = F * d) ... ... formula 2

When the magnitude of the force is constant, the force arm is proportional to the moment, and 100 g and 200 g weights (load 200) are placed in the load zone 113, and the weight (gw) of the vertical force (Fy) can be obtained by the formula 2.

The distance between the first end 112 and the second end 124 is 26 cm, the distance from the first end 112 to the load area 113 (load 200) is 13 cm, and the weight of 100, 200 g is placed in the loading area 113 (ie, the load) 200) Substitute into formula 2 (L=F*d)

When the load zone 113 is placed with 100g weight Fy1 (vertical force) = 13cm * 100g / 26cm = 50g - (1)

When the load zone 113 is placed 200g weight Fy2 (vertical force) = 13cm * 200g / 26cm = 100g - (2)

In addition, the vertical friction weight of the overall friction coefficient test device is 160g, indicating that the vertical force Fy is as follows:

(1) When the load zone 113 is added with a 100g weight, Fy ₁ = (1) + (empty weight) = 50g + 160g = 210g

(2) When load zone 113 is added with 200g weight, F _y2 = (2) + (empty weight) = 100g + 160g = 2

When 100g and 200g weights were added to the positioning seat 21, the measured strains were 169 micro strain and 333 micro strain, respectively. From Equation 3.1 (1 micro strain = 0.714 Ω), the resistance when adding 100 g weight is 121 Ω, and the resistance when adding 200 g weight is 238 Ω. Since the resistance (strain) is proportional to the force, that is, the two are linear, it is possible to connect the two points to draw a straight line. Let the Y axis represent g (load), the X axis represent Ω (resistance), a be the slope, b be the intercept, and the equation is Y = b + aX. X ₁ =121 Ω when Y ₁ =:100g; X ₂ =238 Ω when Y ₂ =200g, the two points are expressed by the equation as follows: 100=b+a‧121...........................( 1)

200=b+a‧238..............................(2)

Solve the above (1), (2) simultaneous equations, and find the intercept (b) and slope (a) of the line (detailed below)

The needle body 100 (outer diameter 1.2mm, 0.8mm and 0.5mm) of the friction force to be tested is successively mounted on the needle seat and closely adhered to the rubber gasket 101 (film), and is successively in the load zone 113 (center) Point) put 100g, 200g weight, slowly pull the rubber gasket 101 (矽 film) to the left outside through the slow speed motor 60 (speed 0.01m / s), at this time because the second sensor frame 122 is pulled outward, The strain gauge 40 attached to the second sensing frame 122 generates a "strain" signal (unit: micro strain) due to the deformation, and the signal is transmitted to the strain indicating recorder 50 to display and record the strain, and the force at this time Fx is static friction. Until the signal rises to the highest point, the force is “maximum static friction”. After the descent, the strain is almost constant, and the rubber gasket 101 (film) starts to move, and the force at this time is "dynamic friction". From Equation 1 (1 Micro Strain = 0.714 ohms), the resistance of the load zone 113 plus 100g, 200g weight maximum static friction is converted into frictional force Fxs ₁ , Fxs ₂ , and the resistance with dynamic friction is converted into friction force Fxk ₁ , Fxk ₂ .

Furthermore, the friction coefficient μ=Fx/Fy..............................Formula 3

From the above, the horizontal frictional force (maximum static frictional force or dynamic frictional force) obtained by F x and the vertical natural force obtained by Fy (210 g at 100 g and 260 g at 200 g). The friction coefficient of each needle body 100 placed with different kinds of seed 200 can be obtained by formula 3.

When measuring the horizontal load zone 113 (center point) with 100g and 200g weights, ie, Y1=100g, Y2=200g, the measured strains are X ₁ =169 micro strain, X ₂ =333 micro strain, and substituted into formula 3.1 ( 1 Micro Strain is equal to 0.714 Ω), and X ₁ = 121 Ω and X ₂ = 238 Ω are obtained. Since the strain gauge 40 is deformed by the force, the resistance of the metal guide group 42 is increased, and the strain (resistance) is positively correlated with the force, that is, the relationship between the two is linear, and a straight line can be drawn by connecting the two points. Let the Y axis represent g (load weight), the X axis represent Ω (voltage), a be the slope, b be the intercept, and the linear equation Y=b+aX............................................. Formula 4

X ₁ =121 Ω when Y ₁ =100g; X ₂ =238 Ω when Y ₂ =200g, the two-point equation is expressed as follows: Y1=100=b+a‧121------------- ------------------------(1)

Y2=200=b+a‧238-------------------------------------(2)

Solving the above equation, the a (slope) is 0.8547 and the b (intercept) is -3.4187. When the needle diameter of the needle body 100 is 0.8 mm plus 100 g weight, the strain 249 micro strain of the maximum static friction force (Fxs) is measured as 178 Ω, which is substituted into the formula 4 to find the load of the point is 148 gw, and the three points are marked on the coordinates. The upper and lower sides are connected in a straight line. The experimental results show that the resistance (strain) is proportional to the load, as shown in Table 1 below.

Similarly, the intercept b (-3.4187) and the slope a (0.8547) are substituted into the needle diameters of the needle body 100 as measured by the above-mentioned needle diameters of 1.2 mm, 0.8 mm, and 0.5 mm, and the strains when adding 100 g and 200 g weights are substituted into the formula 1. ) Converted to resistance, and then find the maximum static friction force (Fxs) and dynamic friction force (Fxk) of each needle under different load, as shown in Table 2, 3, and Figure 2 and Figure 3.

The results of this example show that the coefficient of friction is proportional to the needle (diameter) and resistance (load).

According to the above configuration, the friction coefficient test device of the present invention can have an excellent measurement accuracy for the friction coefficient test of the needle body, and is relatively simple and convenient to use, and is easy to manufacture by the simple design of the overall structure. Implementation has deep economic benefits.

In summary, this creation is a friction coefficient test device, which is a novelty, progressive and can be specifically implemented. It has undoubtedly met the patent requirements of China's patent law, and proposed a new patent application according to law. As soon as the patent is granted, it is a prayer.

However, the above description is only an embodiment of the present invention, and is not intended to limit the scope of the present invention. Therefore, the shapes, structures, features, and spirits described in the scope of the patent application are equally changed and modified. It should be included in the scope of the patent application for this creation.

Claims (15)

A friction coefficient testing device includes: a body device including a load frame body and a sensing frame body, the load frame system having a connecting end and a first end end, the connecting end connecting the sensing frame The sensing frame system is arranged in an upright manner, and includes a first sensing frame and a second sensing frame connected to each other, and a bottom end of the second sensing frame is a second supporting end; a positioning device is disposed at a second end of the frame device, the positioning device includes a positioning seat for positioning a needle body for a measuring operation; a supporting device The support base is connected to the first end of the load frame; and a strain device is disposed on the second sensor frame of the sensing frame. The device has a wire that is electrically connected to a strain indicator recorder. The friction coefficient testing device of claim 1, wherein the load frame body and the sensing frame system are integrally formed with a long plate body. The friction coefficient testing device of claim 2, wherein a bending portion is coupled between the first sensing frame and the second sensing frame. The friction coefficient testing device of claim 1, wherein the strain device is a strain gauge, and the strain indicating recorder is connected to a host. The friction coefficient testing device of claim 3, wherein the sensing frame system is disposed in a U-shaped long plate body, and the load frame body is at one half of a horizontal distance between the first branch end and the second end end There is a load zone for setting a load. The friction coefficient testing device of claim 1, wherein the positioning device further comprises a positioning cover for pressing the needle body during the set position measurement operation. The friction coefficient testing device of claim 6, wherein the positioning seat or the positioning cover is provided with a needle groove. The friction coefficient testing device of claim 1, wherein the positioning device is provided with a positioning portion at the rear end, the positioning portion is fixed to the second sensing frame, and the positioning seat is provided with an embedded portion at the positioning portion. a slot for the embedded positioning of the second sensing frame. The friction coefficient testing device of claim 6, wherein the positioning seat and the positioning cover are respectively affixed to a hinge, so that the positioning cover is covered and lifted relative to the positioning seat. The friction coefficient testing device of claim 9, wherein at least one positioning screw hole is disposed on one end surface of the positioning seat, and the positioning cover is provided with a through screw hole opposite to the positioning screw hole, and the through screw hole is provided There is a positioning screw, and one screw portion of the positioning screw is screwed on the through screw hole. The friction coefficient testing device of claim 1, wherein the support base is provided with a support fixing member coupled to the first end of the load frame body for supporting the load frame body. The friction coefficient testing device of claim 1, wherein the support base is provided with a longitudinal rod portion, and the longitudinal rod portion is provided with a longitudinal groove, the longitudinal groove is configured to slide the support fixing member therebetween for adjusting the support fixing The height of the piece. The friction coefficient testing device according to claim 4, wherein the strain gauge comprises a sheet-type carrier, and the carrier is provided with a metal guide group in a zigzag parallel arrangement, the metal guide group A lead terminal is connected to the wire, and the strain gauge cover is provided with a shield member. The friction coefficient testing device of claim 1, further comprising a rubber gasket disposed on a table, the rubber gasket being pulled by a slow speed motor. The friction coefficient testing device of claim 14, wherein the rubber gasket is a crepe film, and the retarding motor is connected to the crepe film by a wire body, and the needle body is flatly attached to the silicone rubber during the measuring operation. a.