Friction coefficient measuring device

Abstract

The utility model relates to a friction coefficient measuring device which comprises a base, a friction simulation structure, a dynamometer and a first counterweight unit, the friction simulation structure is used for providing a semicircular friction surface, a first vertical section of a to-be-measured fiber is connected with the first counterweight unit, and a first bent section is in a 180-degree arc shape and is attached to the semicircular friction surface; and the second vertical section is connected with the dynamometer. According to the invention, the friction simulation structure enables the to-be-tested fiber to be bent to form the 180-degree arc-shaped first bent section, the first vertical section and the second vertical section are located at the two sides of the first bent section, and the positive pressure between the to-be-tested fiber and the friction simulation structure can be determined based on the first counterweight unit connected with the first vertical section. The sliding friction force between the to-be-tested fiber and the friction simulation structure can be determined based on the dynamometer connected with the second vertical section, then the friction coefficient can be rapidly calculated, and the testing device is simple in structure, simple in testing step, high in testing efficiency and high in accuracy.

Description

Technical Field

[0001] The present disclosure relates to the technical field of material property testing, and particularly to a friction coefficient measuring device. Background Art

[0002] Carbon fiber is a high-strength and high-modulus fiber with a carbon content of more than 90%, and is an excellent material for manufacturing high-tech equipment such as aerospace and aviation. The friction performance of carbon fiber is an important index of its mechanical properties.

[0003] In the related art, it is usually necessary to apply pressure to the carbon fiber and then pull it, and the process of assembling the specimen to be tested is relatively cumbersome, and the test efficiency is not high. Utility Model Content

[0004] In order to solve the problems in the related art, the present disclosure provides a friction coefficient measuring device.

[0005] According to an embodiment of the present disclosure, there is provided a friction coefficient measuring device, including:

[0006] A base;

[0007] A friction simulation structure disposed on the base, the friction simulation structure being configured to provide a semi-circular friction surface;

[0008] A dynamometer disposed on the base;

[0009] Wherein, the fiber to be tested includes a first vertical section, a first bending section and a second vertical section connected in sequence, the first vertical section is connected to a first weight unit, the first bending section is in an arc shape of 180° and fits with the semi-circular friction surface, and the second vertical section is connected to the dynamometer.

[0010] In some embodiments, the friction coefficient measuring device further includes a limiting mechanism, the limiting mechanism includes a plurality of limiting structures, and the plurality of limiting structures surround the first vertical section along the circumferential direction of the first vertical section and are tangent to the outer peripheral surface of the first vertical section.

[0011] In some embodiments, the friction simulation structure is fixedly connected to the base, and the dynamometer is slidably connected to the base;

[0012] The friction coefficient measuring device further includes a first tensile machine, the first tensile machine is connected to the dynamometer, and the first tensile machine pulls the dynamometer to drive the fiber to be tested to move relative to the friction simulation structure.

[0013] In some embodiments, the tensile machine includes a driving motor and a first winding shaft and a second winding shaft disposed on the output shaft of the driving motor;

[0014] The dynamometer is connected to the tensile machine through a first rope body, and the first rope body is wound around the first winding shaft;

[0015] The friction coefficient measuring device further includes a speed sensor. The speed sensor is connected to the tensile machine through a second rope body, and the second rope body is wound around the second winding shaft;

[0016] Wherein, the diameter of the second winding shaft is greater than the diameter of the first winding shaft.

[0017] In some embodiments, the friction coefficient measuring device includes a second tensile machine. The output shaft of the second tensile machine is connected to the friction simulation structure to drive the friction simulation structure to rotate;

[0018] The dynamometer is fixedly connected to the base.

[0019] In some embodiments, a second counterweight unit is provided on the second vertical section. The second vertical section penetrates through the second counterweight unit and is connected to the dynamometer;

[0020] Wherein, the mass of the second counterweight unit is the same as the mass of the first counterweight unit.

[0021] In some embodiments, the second counterweight unit includes a detachable first part and a second part;

[0022] The second vertical section is located between the first part and the second part, and the first part and the second part clamp and fix the second vertical section.

[0023] In some embodiments, at least one guide wheel is provided on the base. The fiber to be measured further includes at least one second bending section, and the at least one second bending section corresponds to the at least one guide wheel one by one;

[0024] The fiber to be measured further includes at least one horizontal section; wherein, both ends of the horizontal section located between two adjacent guide wheels are respectively connected to the two second bending sections; and / or, one end of the horizontal section is connected to the second bending section, and the other end is connected to the dynamometer.

[0025] In some embodiments, the friction simulation structure is cylindrical, and a plurality of annular grooves are provided on the outer peripheral surface of the friction simulation structure. The plurality of annular grooves are arranged at intervals along the axial direction of the friction simulation structure, and multiple fibers of the fiber to be measured are separately arranged in the plurality of annular grooves.

[0026] In some embodiments, the friction coefficient measuring device further includes a first bracket, and the friction simulation structure is arranged on the first bracket;

[0027] The first bracket is slidably connected to the base, and the sliding direction is perpendicular to the axial direction of the friction simulation structure and parallel to the horizontal direction.

[0028] The beneficial effects of the present disclosure are as follows: The friction simulation structure enables the fiber to be tested to bend to form a first bent section in the shape of a 180° arc. The first vertical section and the second vertical section are located on both sides of the first bent section. Based on the first counterweight unit connected to the first vertical section, the normal pressure between the fiber to be tested and the friction simulation structure can be determined. Based on the dynamometer connected to the second vertical section, the sliding friction force between the fiber to be tested and the friction simulation structure can be determined. Furthermore, the friction coefficient can be quickly calculated. The structure of the testing device is simple and the testing steps are simple, with high testing efficiency and high accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0030] Figure 1 is a schematic diagram of a friction coefficient measuring device provided according to an exemplary embodiment;

[0031] Figure 2 is a front view of a friction coefficient measuring device provided according to an exemplary embodiment;

[0032] Figure 3 is a schematic diagram of a limiting mechanism provided according to an exemplary embodiment;

[0033] Figure 4 is a schematic diagram of a friction coefficient measuring device provided according to another exemplary embodiment;

[0034] Figure 5 is a front view of a friction coefficient measuring device provided according to another exemplary embodiment. BRIEF DESCRIPTION OF THE DRAWINGS:

[0036] 100. Friction coefficient measuring device;

[0037] 10. Base; 11. First bracket;

[0038] 20. Friction simulation structure;

[0039] 30. Dynamometer;

[0040] 40a. First counterweight unit; 40b. Second counterweight unit;

[0041] 50. Limit mechanism; 51. Limiting structure; 52. Second bracket; 521. Second buckle; 53. Rotating shaft; 531. First buckle; 532. Connecting rod; 54. Spring

[0042] 60. First tensile machine; 61. Driving motor; 62. First winding shaft; 63. First rope

[0043] 70. Second tensile machine

[0044] 80. Guide wheel

[0045] 200. Fiber to be measured; 201. First vertical section; 202. First bending section; 203. Second vertical section; 204. Horizontal section; 205. Third vertical section Detailed implementation manners

[0046] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model. It should be noted that, without conflict, the embodiments in the present disclosure and the feature vectors in the embodiments may be arbitrarily combined with each other

[0047] To solve the problems existing in the related technologies, the embodiments of the present disclosure provide a friction coefficient measuring device. The friction coefficient measuring device includes a base, a friction simulation structure, a dynamometer and a first counterweight unit. The friction simulation structure is used to provide a semi-circular friction surface. The fiber to be measured includes a first vertical section, a first bending section and a second vertical section connected in sequence. The first vertical section is connected to the first counterweight unit. The first bending section is in the shape of a 180° arc and fits with the semi-circular friction surface. The second vertical section is connected to the dynamometer. In the present disclosure, the friction simulation structure enables the fiber to be measured to bend to form a first bending section in the shape of a 180° arc. The first vertical section and the second vertical section are located on both sides of the first bending section. Based on the first counterweight unit connected to the first vertical section, the normal pressure between the fiber to be measured and the friction simulation structure can be determined. Based on the dynamometer connected to the second vertical section, the sliding friction between the fiber to be measured and the friction simulation structure can be determined. Furthermore, the friction coefficient can be quickly calculated. The structure of the test device is simple and the test steps are simple, and the test efficiency and accuracy are high

[0048] According to an exemplary embodiment of the present disclosure, as Figure 1 and Figure 4As shown in the figure, an embodiment of the present disclosure provides a friction coefficient measuring device 100, which is used to measure the friction coefficient of a fiber bundle, such as a carbon fiber bundle, which has the characteristic of high surface smoothness. In some application scenarios, the fiber bundle can reduce the frictional force, helping to reduce the energy loss in the mechanical system to improve the movement efficiency.

[0049] As Figure 1 shown, the friction coefficient measuring device 100 includes a base 10, and the base 10 is used to support other structures and devices of the friction coefficient measuring device 100. In this embodiment, an exemplary base 10 in the shape of a plate is shown, which does not limit the technical solution of the present disclosure.

[0050] As Figure 1 and Figure 2 shown, the friction coefficient measuring device 100 further includes a friction simulation structure 20, and the friction simulation structure 20 is arranged on the base 10. The friction simulation structure 20 is used to provide a friction surface. It should be noted that there are significant differences in the friction coefficients between different two materials. For example, there is one friction coefficient between a fiber and steel, and another friction coefficient between a fiber and plastic. Therefore, the friction simulation structure 20 provided in this embodiment can be a structure that may generate friction with the fiber in any application scenario. For example, the friction simulation structure 20 is arranged to be detachably connected to the base 10, and the friction simulation structure 20 made of the corresponding material is selected according to the test requirements.

[0051] Among them, referring to Figure 1 and Figure 2 , the friction simulation structure 20 provided in this embodiment can provide a semi-circular friction surface, and the friction simulation structure 20 can be in the shape of a cylinder, for example. During the test, the fiber 200 to be measured is placed on the friction simulation structure 20, and tensile forces are applied to both ends of the fiber 200 to be measured, so that a part of the structure of the fiber 200 to be measured (the first bending section 202, which will be introduced in detail later) can be matched and fitted with the shape of the semi-circular friction surface. The pressure of the fiber 200 to be measured on the friction simulation structure 20 is vertically downward, and the pressure can be determined based on the tensile forces applied to both ends of the fiber 200 to be measured. In this embodiment, the friction simulation structure 20 is arranged to be able to provide a semi-circular friction surface, and there is no need to separately set a component for providing a normal pressure, which is beneficial to simplifying the structure of the friction coefficient measuring device 100 and simplifying the test steps.

[0052] As Figure 1 and Figure 2As shown, the friction coefficient simulation device further includes a dynamometer 30, which is disposed on the base 10. During the test, the dynamometer 30 can be connected to one end of the fiber 200 to be tested. It can be understood that during the test, the fiber 200 to be tested will move relative to the friction simulation structure 20. The moving direction of the fiber 200 to be tested is tangent to the semi-circular friction surface of the friction simulation structure 20, and the moving direction of the fiber 200 to be tested is parallel to its extending direction. When the fiber 200 to be tested moves under force, the reading of the dynamometer 30 can be increased. Therefore, the friction force between the fiber 200 to be tested and the friction simulation structure 20 can be obtained through the reading of the dynamometer 30.

[0053] Referring to Figure 2 , the fiber 200 to be tested includes a first vertical section 201, a first bent section 202, and a second vertical section 203 that are connected in sequence. The first vertical section 201 is connected to the first counterweight unit 40a. The first bent section 202 is in the shape of a 180° arc and fits the semi-circular friction surface of the friction simulation structure 20. The second vertical section 203 is connected to the dynamometer 30.

[0054] In one example, referring to Figure 1 and 2 , a pulling force can be applied to the dynamometer 30 so that the dynamometer 30 drives the second vertical section 203 to move, and then drives the first bent section 202 of the fiber 200 to be tested to slide relative to the friction simulation structure 20. Based on the weight of the first counterweight unit 40a, the normal pressure N between the fiber 200 to be tested and the friction simulation structure 20 is determined. Based on the reading of the dynamometer 30, the sliding friction force f is determined. Based on the friction coefficient μ = f / N, the friction coefficient μ between the fiber 200 to be tested and the friction simulation structure 20 is calculated.

[0055] In another example, referring to Figure 4 and Figure 5 , the rotation of the friction simulation structure 20 can be controlled (in the b direction shown in Figure 5 ) so that the friction simulation structure 20 drives the first bent section 202 to rotate, and then pulls the dynamometer 30 through the first vertical section 201 to generate a friction force reading. The friction coefficient μ = f / N can be calculated using the same principle as in the previous example.

[0056] In the embodiments of the present disclosure, the friction simulation structure enables the fiber to be tested to bend to form a first bent section in the shape of a 180° arc. The first vertical section and the second vertical section are located on both sides of the first bent section. Based on the first counterweight unit connected to the first vertical section, the normal pressure between the fiber to be tested and the friction simulation structure can be determined. Based on the dynamometer connected to the second vertical section, the sliding friction force between the fiber to be tested and the friction simulation structure can be determined. Furthermore, the friction coefficient can be quickly calculated. The structure of the test device is simple and the test steps are simple, and the test efficiency and accuracy are high.

[0057] In an exemplary embodiment, as Figures 1 to 5 shown, this embodiment provides a friction coefficient measuring device 100. The friction coefficient measuring device 100 includes a base 10, a friction simulation structure 20, a dynamometer 30, and a first counterweight unit 40a. The friction simulation structure 20 is used to provide a semi-circular friction surface. The fiber to be measured 200 includes a first vertical section 201, a first bending section 202, and a second vertical section 203 that are connected in sequence. The first vertical section 201 is connected to the first counterweight unit 40a. The first bending section 202 is in the shape of a 180° arc and fits with the semi-circular friction surface. The second vertical section 203 is connected to the dynamometer 30.

[0058] Among them, as Figures 1 to 3 shown, the friction coefficient measuring device 100 includes a limiting mechanism 50. The limiting structure 51 includes a plurality of limiting structures 51. The plurality of limiting structures 51 surround the first vertical section 201 in the circumferential direction of the first vertical section 201 and are tangent to the outer peripheral surface of the first vertical section 201.

[0059] In an example, referring to Figures 1 to 3 , the limiting structure 51 is a roller rotatably connected to the base 10. The outer peripheral surface of the roller is tangent to the outer peripheral surface of the first vertical section 201, so that the first vertical section 201 maintains a vertical state. The plurality of limiting structures 51 are arranged in the circumferential direction of the first vertical section 201. For example, the fiber to be measured 200 composed of multiple fibers (i.e., fiber bundle) is laid out flat along the extension direction of the friction simulation structure 20 ( Figure 1 the x direction shown in Figure 1 ). Two limiting structures 51 can be arranged on both sides of the fiber bundle along the

[0060] In an example, referring to Figures 1 to 3 , the limiting mechanism 50 includes a second bracket 52. The second bracket 52 is slidably connected to the first bracket. A rotatable rotating shaft 53 is provided on the second bracket 52. A connecting rod 532 is provided on the side of the rotating shaft 53 away from the second bracket 52. The connecting rod 532 extends along the radial direction of the rotating shaft 53. The limiting structure 51 is rotatably connected to the connecting rod 532. Continuing to refer to Figure 3 , a first buckle 531 is provided on the outer peripheral surface of the rotating shaft 53. The first buckle 531 is evenly distributed along the circumferential direction of the rotating shaft 53. A second buckle 521 is provided on the second bracket 52. The second buckle 521 is in a U shape. When the first buckle 531 extends into the second buckle 521, the rotating shaft 53 will be restricted and unable to rotate. The limiting mechanism 50 further includes a spring 54. The spring 54 is used to provide a thrust in the axial direction ( Figure 3 the reverse direction of the a direction shown in Figure 3Move the rotating shaft 53 in the direction of a shown in the figure (the spring 54 is compressed), so that the first buckle 531 disengages from the second buckle 521. Then rotate the rotating shaft 53 so that both limiting structures 51 (i.e., rollers) are tangent to the first vertical section 201. Next, release the rotating shaft 53. Under the action of the spring 54, the first buckle 531 of the rotating shaft 53 snaps into the second buckle 521 to complete the locking.

[0061] In this embodiment, by setting the limiting structure 51, the shaking of the first counterweight unit 40a when being pulled can be reduced or avoided, so that the first vertical section 201 remains in a vertical state, thereby ensuring the fitting degree and fitting angle between the first bending section 202 and the friction simulation structure 20, and improving the test accuracy.

[0062] Among them, as Figures 1 to 3 shown, the friction simulation structure 20 is fixedly connected to the first bracket 11, and the dynamometer 30 is slidably connected to the base 10. The friction coefficient measuring device 100 further includes a first tension machine 60. The first tension machine 60 is connected to the dynamometer 30. The first tension machine 60 pulls the dynamometer 30 to move, thereby driving the fiber to be measured 200 to move relative to the friction simulation structure 20, so that a sliding friction is generated between the fiber to be measured 200 and the friction simulation structure 20. At this time, the reading of the dynamometer 30 can be the sum of the mass of the first counterweight unit 40a and the sliding friction force. That is, subtracting the mass of the first counterweight unit 40a from the reading of the dynamometer 30 is the sliding friction force f.

[0063] Among them, as Figure 1 shown, the first tension machine 60 includes a driving motor 61 and a first winding shaft 62 and a second winding shaft provided on the output shaft of the driving motor 61. Refer to Figure 2 , the dynamometer 30 is connected to the first tension machine 60 through a first rope 63, and the first rope 63 is wound around the first winding shaft 62. Refer to Figure 2 , the friction coefficient measuring device 100 further includes a speed sensor (not shown in the drawings). The speed sensor is connected to the first tension machine 60 through a second rope (not shown in the drawings). The second rope is wound around the second winding shaft, and the diameter of the second winding shaft is larger than that of the first winding shaft 62.

[0064] It can be understood that when the fiber to be measured 200 moves at a constant speed, the pulling force on the fiber to be measured 200 will be the same as the magnitude of the sliding friction force. Therefore, during the test, it is necessary to monitor the moving speed of the fiber to be measured 200 by using a speed sensor to ensure that the fiber to be measured 200 is pulled at a constant speed. In the embodiment of the present disclosure, by setting the second winding shaft and the first winding shaft 62 with different diameters, when the driving motor 61 outputs torque to drive the fiber to be measured 200 to move, the driving motor 61 can drive the speed sensor to move at a faster speed, realizing an equal ratio amplification of the moving speed of the fiber to be measured 200 and improving the detection accuracy.

[0065] Among them, as Figure 4 and Figure 5 shown, the friction coefficient measuring device 100 includes a second tensile machine 70. The output shaft of the second tensile machine 70 is connected to the friction coefficient measuring device 100. The second tensile machine 70 is used to drive the friction simulation structure 20 to rotate self - actively. The dynamometer 30 is fixedly connected to the base 10. It can be understood that, contrary to the foregoing embodiments, in the friction coefficient measuring device 100 provided in this embodiment, the friction simulation structure 20 provides the driving force and the dynamometer 30 provides the resistance. When the friction simulation structure 20 rotates idly, a sliding friction force is generated between the friction simulation structure 20 and the fiber 200 to be measured. Since the dynamometer 30 is fixed on the base 10, the fiber 200 to be measured will transmit the force to the dynamometer 30 and cause the dynamometer 30 to generate a reading. The reading of the dynamometer 30 is the sum of the mass of the first counterweight unit 40a and the sliding friction force.

[0066] In an exemplary embodiment, as Figure 1 shown, this embodiment provides a friction coefficient measuring device 100. The friction coefficient measuring device 100 includes a base 10, a friction simulation structure 20, a dynamometer 30, and a first counterweight unit 40a. The friction simulation structure 20 is used to provide a semi - circular friction surface. The fiber 200 to be measured includes a first vertical section 201, a first bending section 202, and a second vertical section 203 connected in sequence. The first vertical section 201 is connected to the first counterweight unit 40a. The first bending section 202 is in the shape of a 180° arc and fits with the semi - circular friction surface. The second vertical section 203 is connected to the dynamometer 30.

[0067] The friction coefficient measuring device 100 provided in this embodiment may include any structures, devices, etc. provided in the above - mentioned respective embodiments.

[0068] Among them, as Figure 4 and Figure 5 shown, a second counterweight unit 40b is provided on the second vertical section 203. The second vertical section 203 passes through the second counterweight unit 40b and is connected to the dynamometer 30. The mass of the second counterweight unit 40b is the same as the mass of the first counterweight unit 40a. By providing the second counterweight unit 40b, it can be ensured that the fiber 200 to be measured is in a balanced state before the test starts. When power is output by a tensile machine (the first tensile machine 60 or the second tensile machine 70), the reading on the dynamometer 30 is the reading of the sliding friction force. By reading the reading of the tensile machine, the magnitude of the sliding friction force can be directly determined, saving calculation steps.

[0069] Among them, as Figure 4 and Figure 5As shown, the shapes of the first counterweight unit 40a and the second counterweight unit 40b can be different. For example, the first counterweight unit 40a can be a weight, and the first vertical section 201 and the weight can be directly tied and fixed. Figure 5 The second counterweight unit 40b includes a detachable first part and a second part, the second vertical section 203 is located between the first part and the second part, and the first part and the second part can clamp and fix the second vertical section 203. In some optional embodiments, the surfaces opposite to the first part and the second part have a high friction coefficient structure to prevent the second counterweight unit 40b from slipping and affecting normal testing.

[0070] The first part and the second part are connected by any one or more of magnetic connection, snap connection or fastener connection, and it is only necessary to ensure that there is enough pressure between the first part and the second part to prevent the second counterweight unit 40b from slipping.

[0071] In an exemplary embodiment, Figure 1 As shown, this embodiment provides a friction coefficient measuring device 100, which includes a base 10, a friction simulation structure 20, a dynamometer 30 and a first counterweight unit 40a. The friction simulation structure 20 is used to provide a semicircular friction surface. The fiber 200 to be measured includes a first vertical segment 201, a first curved segment 202 and a second vertical segment 203 which are connected in sequence. The first vertical segment 201 is connected to the first counterweight unit 40a. The first curved segment 202 is in a 180° arc shape and fits the semicircular friction surface. The second vertical segment 203 is connected to the dynamometer 30.

[0072] In this embodiment, Figure 2 As shown, at least one guide wheel 80 is disposed on the base 10 , and the fiber 200 to be tested further includes at least one second bending section, and the second bending section is disposed in a one-to-one correspondence with the guide wheel 80 .

[0073] See also Figure 2 The fiber to be tested 200 further includes at least one horizontal section 204, which is disposed between the end of the fiber to be tested 200 and the second vertical section 203, so that the horizontal section 204 is located between two adjacent guide wheels 80 and connected to two second curved sections (not shown in the drawings). Figure 2 The horizontal section 204 can also be arranged at the end of the fiber 200 to be tested, so that the horizontal section 204 is connected to the dynamometer 30. The second curved section is in a 90° arc shape.

[0074] In one example, see Figure 2 , exemplarily showing that the friction coefficient measuring device 100 is provided with three guide wheels 80 , and the fiber 200 to be measured includes three second curved sections (not shown in the drawings), two horizontal sections 204 and a third vertical section 205 .

[0075] Among them, as Figure 1 shown, the friction simulation structure 20 is cylindrical, and a plurality of annular grooves are provided on the outer peripheral surface of the cylinder. The plurality of annular grooves are arranged at intervals along the axial direction of the friction simulation structure 20. During the test, multiple fibers constituting the fiber to be tested 200 are separately arranged in the plurality of annular grooves to prevent the multiple fibers from gathering into a single strand or flipping.

[0076] Among them, as Figure 1 shown, the friction coefficient measuring device 100 further includes a first bracket 11. The friction simulation structure 20 is arranged on the first bracket 11. The first bracket 11 is slidably connected to the base 10, and the sliding direction is perpendicular to the axial direction of the friction simulation structure 20 ( Figure 1 the x direction shown in the figure) and parallel to the horizontal direction. In this embodiment, by providing the first bracket 11 slidably connected to the base 10, the horizontal distance between the friction simulation structure 20 on the first bracket 11 and the guide wheel 80 can be adjusted according to the diameter size of the fiber to be tested 200, ensuring that the second vertical section 203 of the fiber to be tested 200 is always in a vertical state during the test, so that a first bending section 202 with a 180° arc angle is formed between the fiber to be tested 200 and the friction simulation structure 20, ensuring that the normal pressure exerted by the fiber to be tested 200 on the friction simulation structure 20 remains unchanged, and improving the test accuracy.

[0077] In the description of the present disclosure, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "parallel", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present disclosure.

[0078] In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third" may explicitly or implicitly include at least one of such features. In the description of the present disclosure, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0079] In this disclosure, unless otherwise clearly specified or limited, terms such as "installation", "connection", "fixation", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium. It can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure, not to limit them; although the technical solutions of this disclosure have been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A friction coefficient measuring device, characterized in that, For measuring the friction coefficient of a fiber bundle, the friction coefficient measuring device includes: A base; A friction simulation structure disposed on the base, the friction simulation structure being configured to provide a semi-circular friction surface; A dynamometer disposed on the base; Wherein, the fiber to be measured includes a first vertical section, a first bent section and a second vertical section connected in sequence, the first vertical section is connected to a first counterweight unit, the first bent section is in a 180° arc shape and fits with the semi-circular friction surface, and the second vertical section is connected to the dynamometer.

2. The friction coefficient measuring device according to claim 1, characterized in that, The friction coefficient measuring device further includes a limiting mechanism, the limiting mechanism includes a plurality of limiting structures, and the plurality of limiting structures surround the first vertical section along the circumferential direction of the first vertical section and are tangent to the outer peripheral surface of the first vertical section.

3. The friction coefficient measuring device according to claim 1, wherein The friction simulation structure is fixedly connected to the base, and the dynamometer is slidably connected to the base; The friction coefficient measuring device further includes a first tension machine, the first tension machine is connected to the dynamometer, and the first tension machine pulls the dynamometer to drive the fiber to be measured to move relative to the friction simulation structure.

4. The friction coefficient measuring device according to claim 3, wherein, The tension machine includes a driving motor and a first winding shaft and a second winding shaft disposed on the output shaft of the driving motor; The dynamometer is connected to the tension machine through a first rope body, and the first rope body is wound around the first winding shaft; The friction coefficient measuring device further includes a speed sensor, the speed sensor is connected to the tension machine through a second rope body, and the second rope body is wound around the second winding shaft; Wherein, the diameter of the second winding shaft is larger than the diameter of the first winding shaft.

5. The friction coefficient measuring device according to claim 1, characterized in that, The friction coefficient measuring device includes a second tension machine, and the output shaft of the second tension machine is connected to the friction simulation structure to drive the friction simulation structure to rotate; The dynamometer is fixedly connected to the base.

6. The friction coefficient measuring device according to any one of claims 1-5, characterized in that, A second counterweight unit is disposed on the second vertical section, and the second vertical section passes through the second counterweight unit and is connected to the dynamometer; Wherein, the mass of the second counterweight unit is the same as the mass of the first counterweight unit.

7. The friction coefficient measuring device according to claim 6, characterized in that, The second counterweight unit includes a detachable first part and a second part; The second vertical section is located between the first part and the second part, and the first part and the second part clamp and fix the second vertical section.

8. The friction coefficient measuring device according to claim 1, characterized in that, At least one guide wheel is disposed on the base, and the fiber to be measured further includes at least one second bent section, and the at least one second bent section corresponds to the at least one guide wheel one by one; The fiber to be measured further includes at least one horizontal section; wherein, both ends of the horizontal section located between two adjacent guide wheels are respectively connected to two of the second bent sections; and / or, one end of the horizontal section is connected to the second bent section and the other end is connected to the dynamometer.

9. The friction coefficient measuring device according to claim 1, characterized in that, The friction simulation structure is cylindrical, and a plurality of annular grooves are disposed on the outer peripheral surface of the friction simulation structure, and the plurality of annular grooves are spaced along the axial direction of the friction simulation structure, and multiple fibers of the fiber to be measured are separately disposed in the plurality of annular grooves.

10. The friction coefficient measuring device according to claim 1, characterized in that, The friction coefficient measuring device further includes a first bracket, and the friction simulation structure is arranged on the first bracket; The first bracket is slidably connected to the base, and the sliding direction is perpendicular to the axial direction of the friction simulation structure and parallel to the horizontal direction.

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