CN115718065A - Friction measuring device - Google Patents
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- CN115718065A CN115718065A CN202310028767.4A CN202310028767A CN115718065A CN 115718065 A CN115718065 A CN 115718065A CN 202310028767 A CN202310028767 A CN 202310028767A CN 115718065 A CN115718065 A CN 115718065A
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Abstract
The application relates to the technical field of friction measurement and discloses a friction measurement device which comprises a rack, a driving mechanism, a detection mechanism and a pressure loading mechanism. The driving mechanism comprises a fixing assembly and a rotary driving piece, the fixing assembly is used for fixing a sample to be detected along the vertical direction, and the rotary driving piece is connected to the fixing assembly and used for driving the fixing assembly to rotate in a vertical plane; the detection mechanism comprises a swing arm, a friction ball and a measuring piece, wherein the friction ball is connected to one end of the swing arm and used for pressing a sample to be detected, the friction ball and the sample to be detected form a friction pair, and the swing arm can rotate in a vertical plane along with the sample to be detected; the measuring piece is used for measuring the friction force between the friction ball and the sample to be measured according to the rotation of the swing arm; the pressure loading mechanism is used for pulling the swing arm along the horizontal direction so as to press the friction ball on the sample to be tested. The application provides a friction measuring device through improving self structure, can solve the technical problem that current measuring device normal pressure value is inaccurate, the coefficient of friction survey accuracy is low.
Description
Technical Field
The application relates to the technical field of friction measurement, in particular to a friction measuring device.
Background
The friction measuring device is the most commonly used device in tribology research such as friction, wear, load and lubrication, and can be used for measuring the friction characteristics of a material, such as obtaining the friction coefficient of the material.
The friction measuring device commonly used in the prior art is generally of a horizontal structure, and when the friction coefficient is measured, a sample to be measured needs to be horizontally placed, a weight is applied above a friction contact point, and positive pressure required by measurement is provided by means of the gravity of the weight. However, the friction measuring device has a weight, and the components of the friction measuring device act on the sample to be measured, so that the accuracy of the positive pressure value and the friction coefficient measurement is affected.
Disclosure of Invention
The application aims to provide a friction measuring device which is used for solving the technical problems that the value of the positive pressure of the existing measuring device is inaccurate, and the measuring accuracy of the friction coefficient is low.
In order to solve the above problem, the present application provides a friction measuring device, including:
a frame;
the driving mechanism is arranged on the rack and comprises a fixing assembly and a rotary driving piece, the fixing assembly is used for fixing a sample to be tested along the vertical direction, and the rotary driving piece is connected to the fixing assembly and is used for driving the fixing assembly to rotate in a vertical plane;
the detection mechanism comprises a swing arm, a friction ball and a measuring part, the swing arm is rotatably connected to the rack, the swing arm and the fixed component are parallel and arranged at intervals, the friction ball is connected to one end of the swing arm and used for pressing the sample to be detected, and the friction ball and the sample to be detected form a friction pair, so that the swing arm can rotate along with the sample to be detected in a vertical plane; the measuring piece is used for measuring the friction force between the friction ball and the sample to be measured according to the rotation of the swing arm;
the pressure loading mechanism is arranged on the rack, the pressure loading mechanism is connected to one side, facing the fixed component, of the swing arm, and the pressure loading mechanism is used for pulling the swing arm along the horizontal direction so that the friction ball is pressed on the sample to be tested.
In an embodiment, the measuring part is a pulling pressure sensor, the pulling pressure sensor is fixed on the frame and located at one end of the swing arm far away from the friction ball, and the pulling pressure sensor is used for abutting against the swing arm.
In one embodiment, a groove is formed in one end, close to the swing arm, of the tension and pressure sensor, a ball plunger is arranged on the side wall of the groove, and the swing arm extends into the groove and abuts against the ball plunger.
In an embodiment, the rack is provided with a ball bearing sleeve arranged along the horizontal direction, the detection mechanism further comprises a connecting rod rotatably arranged in the ball bearing sleeve in a penetrating manner, the connecting rod can move along the axial direction of the ball bearing sleeve, one end of the connecting rod is connected to the swing arm, and the other end of the connecting rod is connected to the pressure loading mechanism.
In an embodiment, the pressure loading mechanism includes a pulley holder, a pulley, a pull rope, and a weight, the pulley holder is connected to the frame, the pulley is rotatably disposed on the pulley holder, one end of the pull rope is connected to the swing arm, and the other end of the pull rope is connected to the weight after passing around the pulley.
In an embodiment, the pull rope comprises a horizontal extension section and a vertical extension section, the horizontal extension section extends along the horizontal direction and is used for connecting the swing arm, and the vertical extension section extends along the vertical direction and is used for connecting the weight.
In an embodiment, the pressure loading mechanism includes a spring and a connecting rope, the spring and the connecting rope are horizontally disposed on the frame, one end of the connecting rope is connected to the spring, the other end of the connecting rope is connected to the swing arm, and the connecting rope is tensioned.
In an embodiment, fixed subassembly includes carousel and mounting, the carousel is followed vertical direction extends the setting, one side of carousel connect in rotary driving piece's output shaft to the opposite side is used for the installation the sample that awaits measuring, the mounting is located just be used for fixing on the carousel the sample that awaits measuring.
In one embodiment, the fixing part is a pressing plate, the pressing plate is detachably mounted on the turntable, a window is arranged in the middle of the pressing plate, the window is used for exposing part of the sample to be detected, and the friction ball can extend into the window.
In an embodiment, the fixing assembly further includes an elastic pad compressed between the rotary table and the pressing plate.
The friction measuring device comprises a rack, a driving mechanism, a detecting mechanism and a pressure loading mechanism, wherein on one hand, the driving mechanism comprises a fixing component and a rotary driving component, the fixing component is used for fixing a sample to be measured along the vertical direction, and the rotary driving component is connected to the fixing component and used for driving the fixing component to rotate in a vertical plane; on the other hand, detection mechanism includes swing arm and friction ball, the swing arm is parallel with fixed subassembly and the interval sets up, the friction ball is connected in the one end of swing arm and is used for pressing the sample that awaits measuring, the friction ball forms the friction pair with the sample that awaits measuring, pressure loading mechanism connects in the one side of swing arm towards fixed subassembly, pressure loading mechanism is used for pulling the swing arm along the horizontal direction so that the friction ball presses on the sample that awaits measuring, so set up, the pulling force that press loading mechanism applied in the swing arm can turn into along the positive pressure of horizontal direction and act on the sample that awaits measuring through the friction ball, thereby can eliminate the influence of measuring device self gravity to adjusting the pressure value well, effectively improve the accuracy of coefficient of friction survey.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic perspective view of a friction measuring device provided in an embodiment of the present application;
FIG. 2 is a front view of the friction measuring device of FIG. 1;
FIG. 3 is a cross-sectional view of the friction measuring device of FIG. 1;
FIG. 4 is a side view of the friction measuring device of FIG. 1 with the protective housing removed;
FIG. 5 is a schematic view of the friction measuring device of FIG. 4 in use;
FIG. 6 is a schematic structural diagram of another friction measuring device provided in the embodiments of the present application;
fig. 7 is a schematic structural diagram of another friction measurement device according to an embodiment of the present application.
Description of the main element symbols:
100. a friction measuring device;
1. a frame; 11. a protective housing;
2. a drive mechanism; 21. a fixing assembly; 211. a turntable; 212. a fixing member; 2121. windowing; 22. a rotary drive member; 221. an output shaft;
3. a detection mechanism; 31. swinging arms; 32. a friction ball; 33. a measuring member; 331. a groove; 332. a through groove; 34. a ball plunger;
4. a pressure loading mechanism; 41. a pulley seat; 42. a pulley; 43. pulling a rope; 44. a weight; 45. a spring; 46. connecting ropes;
51. a ball bearing sleeve; 52. a connecting rod; 53. a shaft sleeve seat.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly or indirectly secured to the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The terms "upper", "lower", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are for convenience of description only, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the patent. The terms "first", "second" and "first" are used merely for descriptive purposes and are not to be construed as indicating or implying relative importance or to implicitly indicate a number of technical features. The meaning of "plurality" is two or more unless specifically limited otherwise.
Reference throughout this specification to "one embodiment," "some embodiments," or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
The coefficient of friction is an important parameter for studying the wear of friction materials. The friction coefficient is the ratio of the friction between two surfaces to the vertical force acting on one surface, and the magnitude of the friction coefficient is related to the roughness of the material surface and is not related to the magnitude of the contact area. In the measurement of the friction coefficient, how to obtain accurate positive pressure and friction becomes the key for improving the measurement accuracy.
The application provides a friction measuring device. Referring to fig. 1 and 2, the friction measuring device 100 includes a frame 1, a driving mechanism 2, a detecting mechanism 3, and a pressure loading mechanism 4. The driving mechanism 2 is disposed on the rack 1, the driving mechanism 2 includes a fixing component 21 and a rotary driving component 22, the fixing component 21 is used for fixing the sample to be tested along a vertical direction (for example, a direction indicated by Y in fig. 2), and the rotary driving component 22 is connected to the fixing component 21 and is used for driving the fixing component 21 to rotate in a vertical plane. As shown in fig. 2 and 3, the detecting mechanism 3 includes a swing arm 31, a friction ball 32 and a measuring part 33, the swing arm 31 is rotatably connected to the rack 1, the swing arm 31 is parallel to and spaced from the fixing component 21, as shown in fig. 2, 4 and 5, the friction ball 32 is connected to one end of the swing arm 31 and used for pressing a sample to be measured, the friction ball 32 and the sample to be measured form a friction pair, so that the swing arm 31 can rotate in a vertical plane along with the sample to be measured; the measuring part 33 is used for measuring the friction force between the friction ball 32 and the sample to be measured according to the rotation of the swing arm 31. The pressure loading mechanism 4 is disposed on the rack 1, the pressure loading mechanism 4 is connected to a side of the swing arm 31 facing the fixing assembly 21, and the pressure loading mechanism 4 is configured to pull the swing arm 31 in a horizontal direction (e.g., a direction indicated by X in fig. 2) so as to press the friction ball 32 onto the sample to be tested.
The surface of the sample to be measured is flat, and the friction ball 32 and the sample to be measured can slide relatively under the action of external force. The friction ball 32 is fixed at one end of the swing arm 31 through a fastening screw, the swing arm 31 rotates within a certain angle range, and the rotation amplitude of the swing arm 31 is related to the friction coefficient of a sample to be measured.
The friction measuring device 100 is used in a friction coefficient measuring experiment, and can measure the friction characteristics of a sample to be measured in a state that the sample to be measured is vertically arranged. The specific use mode is as follows: firstly, a sample to be measured is arranged on a fixed component 21, and the sample to be measured is vertically arranged; then, adjusting the positions of the swing arm 31 and the friction ball 32 to enable the friction ball 32 to be opposite to the sample to be detected; then, a pressure loading mechanism 4 is used for applying a pulling force with a determined value, the pulling force acts on the swing arm 31, the friction ball 32 can be pressed on a sample to be tested by pulling the swing arm 31 in the horizontal direction, wherein the friction ball 32 is pressed on the sample to be tested, and the pulling force is converted into a positive pressure N applied to the sample to be tested; then, the fixed component 21 and the sample to be tested mounted on the fixed component 21 are driven to rotate in a vertical plane by the rotary driving component 22, a friction pair is formed with the friction ball 32 in the rotation process of the sample to be tested, and the friction ball 32 and the swing arm 31 rotate by a certain angle under the action of friction force; then, the friction force F is obtained by the measuring member 33; then, the friction coefficient was calculated according to the friction coefficient formula μ = F/N.
The friction measuring device 100 provided by the application comprises a rack 1, a driving mechanism 2, a detection mechanism 3 and a pressure loading mechanism 4, wherein on one hand, the driving mechanism 2 comprises a fixed component 21 and a rotary driving part 22, the fixed component 21 is used for fixing a sample to be measured along the vertical direction, and the rotary driving part 22 is connected to the fixed component 21 and is used for driving the fixed component 21 to rotate in a vertical plane; on the other hand, detection mechanism 3 includes swing arm 31 and friction ball 32, swing arm 31 is parallel to fixed subassembly 21 and the interval sets up, friction ball 32 is connected in the one end of swing arm 31 and is used for pressing the sample that awaits measuring, friction ball 32 forms the friction pair with the sample that awaits measuring, pressure loading mechanism 4 is connected in swing arm 31 towards one side of fixed subassembly 21, pressure loading mechanism 4 is used for pulling swing arm 31 along the horizontal direction so that friction ball 32 presses on the sample that awaits measuring, so set up, the pulling force that press loading mechanism applyed in swing arm 31 can turn into along the positive pressure of horizontal direction and act on the sample that awaits measuring through friction ball 32, thereby can eliminate the influence that measuring device self gravity was adjusted the normal pressure value, effectively improve the accuracy of coefficient of friction survey.
The friction measuring device 100 can be used to measure the friction coefficient of a film material, which is disposed on a substrate and fixed on the fixing assembly 21 together with the substrate. The substrate may be a silicon substrate or a substrate made of other materials.
In the embodiment provided by the present application, as shown in fig. 2 and fig. 3, the fixing assembly 21 includes a rotating disc 211 and a fixing member 212, the rotating disc 211 extends along a vertical direction, one side of the rotating disc 211 is connected to the output shaft 221 of the rotating driving member 22, and the other side is used for mounting the sample to be tested, and the fixing member 212 is disposed on the rotating disc 211 and is used for fixing the sample to be tested.
Optionally, the output shaft 221 of the rotary driving element 22 is connected to the rotating shaft of the turntable 211, and the rotary driving element 22 can drive the whole turntable 211, the fixing element 212 arranged on the turntable 211, and the sample to be measured to rotate together.
Adopt above-mentioned design, carousel 211 simple structure, stability is high and convenient to use.
In the embodiment provided by the present application, as shown in fig. 2 and fig. 4, the fixing element 212 is a pressing plate, the pressing plate is detachably mounted on the rotary table 211, a window 2121 is disposed in the middle of the pressing plate, the window 2121 is used for exposing a portion of the sample to be measured, and the friction ball 32 can extend into the window 2121.
The pressing plate is arranged on one side of the rotary disk 211, which is far away from the rotary driving piece 22, and is fixed on the rotary disk 211 through a fastener. Pressing the holding clearance that forms the sample that is used for installing between board and the carousel 211, adjusting fastening spare can realize pressing the dismouting of board and sample and carousel 211 to await measuring to and can realize the sample that awaits measuring compressing tightly fixedly. Wherein, the fastener can be a screw or a bolt, etc.
The window 2121 is larger than the friction ball 32 and at least covers the moving track of the friction ball 32 to ensure that the friction ball 32 can normally contact with the sample to be measured and ensure the accuracy of the friction force measurement.
Adopt above-mentioned design, press platen simple structure, it is fixed effectual to the sample dismouting degree of difficulty that awaits measuring is low.
It is understood that in some embodiments, the fixing member 212 may also be a fixing clip disposed on the turntable 211, and the fixing clip is used for clamping and fixing the sample to be tested.
In the embodiment provided by the application, the rotary disc 211 and the pressing plate are arranged oppositely, and the size and the structure are similar. Alternatively, as shown in fig. 2 and 4, the rotary disk 211 is a circular rotary disk 211, and the pressing plate is an annular plate.
Adopt above-mentioned design, fixed subassembly 21 is rational in infrastructure, and fixed subassembly 21 rotates the in-process and is difficult for interfering with other structures.
It can be understood that, according to the structure of the sample to be measured, the rotary table 211 and the pressing plate may also have other shapes, and may be designed according to the actual situation, and are not limited herein.
In the embodiment provided by the present application, the fixing assembly 21 further includes an elastic pad, and the elastic pad is compressed between the rotating disc 211 and the pressing plate.
The number of resilient pads is not exclusive. Optionally, in some embodiments, a set of elastic gaskets is disposed between the rotary table 211 and the pressing plate, and the elastic gaskets are pressed against one side of the sample to be tested; alternatively, in some embodiments, two sets of elastic pads are disposed between the rotary table 211 and the pressing plate, and the two sets of elastic pads are respectively pressed on two opposite sides of the sample to be tested.
The elastic gasket can be made of silica gel.
Adopt above-mentioned design, through addding the elastic gasket, be favorable to promoting fixed subassembly 21 to the fixed effect of the sample that awaits measuring to can reduce the risk of the sample pressurized damage that awaits measuring.
In the embodiment provided herein, the rotary drive 22 is a drive motor.
By adopting the design, the motor has the advantages of simple structure, small volume, convenient control and the like, and the motor drives the fixed component 21 to rotate, so that the structure is reasonable and the reliability is high.
In the embodiment provided by the present application, as shown in fig. 2, 4 and 5, the measuring part 33 is a pulling pressure sensor, the pulling pressure sensor is fixed on the frame 1 and is located at one end of the swing arm 31 far away from the friction ball 32, and the pulling pressure sensor is used for abutting against the swing arm 31.
The pull pressure sensor is also called as resistance strain sensor, and is a device for converting physical signal into measurable electric signal and outputting the signal. When the swing arm 31 rotates, the end portion of the swing arm can abut against the tension and pressure sensor and can deform the tension and pressure sensor, and the deformation of the tension and pressure sensor can be converted into an electric signal representing the vertical friction force for outputting.
By adopting the design, the friction force measuring mode is simple, the reading is easy, and the accuracy is high.
It is understood that, in some embodiments, a scale for representing the magnitude of the force may be further designed on the frame 1, the swing arm 31 can be deflected to point to a specific scale, the magnitude of the friction force is determined by reading a corresponding scale value, and the specific scale may be designed according to practical situations, and is not limited herein.
In the embodiment provided by the present application, as shown in fig. 2, fig. 4 and fig. 5, a groove 331 is provided at one end of the pulling pressure sensor close to the swing arm 31, a ball plunger 34 is provided on a sidewall of the groove 331, and the swing arm 31 extends into the groove 331 and abuts against the ball plunger 34.
Specifically, the ball of the ball plunger 34 is freely rotatable, and the ball abuts against the swing arm 31.
By adopting the design, the swing arm 31 abuts against the tension and compression sensor and the ball of the ball plunger 34 can rotate in the deformation process of the tension and compression sensor, so that the friction loss between the swing arm 31 and the tension and compression sensor can be reduced, and the accuracy of friction force measurement can be effectively improved.
In the embodiment provided by the present application, as shown in fig. 6, an L-shaped bending structure is further formed at one end of the swing arm 31 extending into the groove 331, so as to improve the contact reliability of the swing arm 31 and the tension/compression sensor.
In the embodiment provided by the application, the pull pressure sensor is a four-bridge arm sensor, a threaded hole is formed in one end of the four-bridge arm sensor, and the four-bridge arm sensor is installed on the rack 1 through a fastener penetrating through the threaded hole. A gap of 1mm-2mm is formed between the side wall of the four-bridge arm sensor and the rack 1, and the free end is not in contact with other parts, so that a cantilever state is formed. The middle part of the four-bridge arm sensor is provided with a through groove 332 so that the four-bridge arm sensor can be deformed under pressure.
In the embodiment provided by the present application, as shown in fig. 1, fig. 2 and fig. 3, a ball bearing sleeve 51 arranged along the horizontal direction is provided on the frame 1, the detection mechanism 3 further includes a connecting rod 52 rotatably inserted into the ball bearing sleeve 51, and the connecting rod 52 can move along the axial direction of the ball bearing sleeve 51, one end of the connecting rod 52 is connected to the swing arm 31, and the other end is connected to the pressure loading mechanism 4.
The frame 1 is further provided with a shaft sleeve seat 53, and the ball shaft sleeve 51 is mounted on the shaft sleeve seat 53.
The connecting rod 52 and the ball bearing 51 can be understood as a cylindrical connection, which can simultaneously realize sliding in the horizontal direction and rotation in the direction perpendicular to the horizontal direction. Specifically, the positive pressure loading mechanism 4 is connected to one end of the connecting rod 52 far away from the swing arm 31, and the positive pressure loading mechanism 4 drives the connecting rod 52 to move along the axial direction of the ball bearing sleeve 51 when acting; the swing arm 31 can be understood as a lever structure, and the connecting rod 52 is connected to any point far away from the two ends of the swing arm 31, so that when the swing arm 31 rotates, the connecting rod 52 is driven to rotate in the ball bearing bush 51.
The connecting rod 52 and the swing arm 31 may be an integral structure, or may be connected by a fastener such as a screw.
With the above design, on one hand, by designing the ball bearing bush 51, the degree of freedom between the connecting rod 52 and the swing arm 31 and the frame 1 can be improved, so that the swing arm 31 can rotate in a vertical plane and can move in a horizontal direction; on the other hand, the ball bearing 51 has a small friction loss, which is advantageous for improving the accuracy of the friction coefficient measurement.
In the embodiments provided in the present application, the type of the pressure loading mechanism 4 is not unique.
In one embodiment, as shown in fig. 1, 2 and 3, the pressure loading mechanism 4 includes a pulley holder 41, a pulley 42, a pull rope 43 and a weight 44, the pulley holder 41 is connected to the frame 1, the pulley 42 is rotatably disposed on the pulley holder 41, one end of the pull rope 43 is connected to the swing arm 31, and the other end is connected to the weight 44 after passing around the pulley 42.
The pulling rope 43 is connected to one end of the connecting rod 52. Specifically, a connecting hole may be formed at an end of the connecting rod 52, and the pull rope 43 may be inserted into the connecting hole; alternatively, the pulling rope 43 may be directly tied or glued to the end of the connecting rod 52.
The weight 44 is selected in relation to the range of the measuring member 33 and the approximate range of the friction coefficient of the sample to be measured, and is not particularly limited herein.
By adopting the design, the gravity of the weight 44 can be converted into the pulling force on the swing arm 31 through the pull rope 43 and the pulley 42, and finally transmitted to the friction ball 32 to be applied on a sample to be measured as a positive pressure, on one hand, the positive pressure provided by the weight 44 is a non-contact force, and does not influence the rotation of the sample to be measured and the effect between friction pairs, thereby being beneficial to improving the accuracy of the measurement of the friction coefficient; on the other hand, the weight 44 provides a tensile force as a determined value, which does not change with the structure, thickness and the like of the sample to be measured, and the applicability is high.
Further, as shown in fig. 1 and 2, the pulling rope 43 includes a horizontally extending section extending in the horizontal direction and used for connecting the swing arm 31, and a vertically extending section extending in the vertical direction and used for connecting the weight 44.
Specifically, as shown in fig. 2 and 3, the central axis of the connecting rod 52 is tangent to the outer circle of the pulley 42, so that the pull rope 43 connected to the connecting rod 52 is kept horizontal, and the gravity of the weight 44 can be completely converted into a pulling force to be applied to the swing arm 31.
By adopting the design, the accuracy of the positive pressure value can be improved, thereby being beneficial to further improving the accuracy of the friction coefficient measurement.
It should be noted that, in some embodiments, there may be some friction loss at the positions of the pulley 42, the ball bearing 51, etc., and this friction loss may be evaluated through experiments and finally incorporated into the calculation formula in the form of a coefficient. For example, ideally, μ = F/N 1 ，N 1 = G, wherein F is friction, N 1 Is positive pressure, G is weight 44 gravity; when friction loss is present, μ = F/N 2 ，N 2 =A 0 G, wherein F is friction, N 2 Is positive pressure, G is weight 44 gravity, A 0 Is a friction loss coefficient determined by an experiment. In most cases, the structures of the pulley 42, the ball bearing 51 and the like are precise instruments, and the friction loss is small and can be generally ignored.
In one embodiment, as shown in fig. 6, the pressure loading mechanism 4 comprises a spring 45 and a connecting rope 46, the spring 45 and the connecting rope 46 are horizontally arranged on the frame 1, one end of the connecting rope 46 is connected to the spring 45, the other end is connected to the swing arm 31, and the connecting rope 46 is tensioned.
The spring 45 provides a defined tension force F N ，F N Finally transmitted to the friction ball 32 through the connecting rope 46 and the swing arm 31 as positive pressure applied to the sample to be measured.
The height of the spring 45 and the connecting rope 46 is consistent with the height of the central axis of the connecting rod 52.
By adopting the above design, the pressure loading mechanism 4 has a simple structure, and the friction measuring device 100 is convenient to process and manufacture.
It is understood that in some embodiments, as shown in fig. 7, the spring 45 may also be directly connected to the connecting rod 52, which may be designed according to practical situations and is not limited herein.
In the embodiment provided by the present application, the frame 1 is used for mounting and fixing each component, and its specific structure is not limited, and in order to reduce the risk of damage to the friction measuring device 100, as shown in fig. 1, fig. 2 and fig. 6, the structure of the protective housing 11 may also be designed to provide protection for the structures such as the measuring part 33.
In summary, the friction measuring device 100 provided by the present application can realize vertical installation and fixation of a sample to be measured by improving the structure of the driving assembly, can measure the friction characteristic of the sample to be measured in a state that the sample to be measured is vertically arranged, and is suitable for a special situation that the sample to be measured cannot be horizontally placed; and, through improving the structure of detection mechanism 3 and pressure loading mechanism 4, can eliminate the influence that measuring device self gravity was taken a value to positive pressure, effectively improve the accuracy of coefficient of friction survey.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A friction measuring device, comprising:
a frame;
the driving mechanism is arranged on the rack and comprises a fixing assembly and a rotary driving piece, the fixing assembly is used for fixing a sample to be tested along the vertical direction, and the rotary driving piece is connected to the fixing assembly and is used for driving the fixing assembly to rotate in a vertical plane;
the detection mechanism comprises a swing arm, a friction ball and a measuring part, the swing arm is rotatably connected to the rack, the swing arm and the fixed component are parallel and arranged at intervals, the friction ball is connected to one end of the swing arm and used for pressing the sample to be detected, and the friction ball and the sample to be detected form a friction pair, so that the swing arm can rotate along with the sample to be detected in a vertical plane; the measuring piece is used for measuring the friction force between the friction ball and the sample to be measured according to the rotation of the swing arm;
the pressure loading mechanism is arranged on the rack, the pressure loading mechanism is connected to one side, facing the fixed component, of the swing arm, and the pressure loading mechanism is used for pulling the swing arm along the horizontal direction so that the friction ball is pressed on the sample to be tested.
2. The friction measuring device of claim 1, wherein the measuring member is a tension and pressure sensor fixed to the frame and located at an end of the swing arm away from the friction ball, the tension and pressure sensor being configured to abut against the swing arm.
3. The friction measuring device of claim 2, wherein a groove is formed in one end of the tension and pressure sensor, which is close to the swing arm, a ball plunger is arranged on a side wall of the groove, and the swing arm extends into the groove and abuts against the ball plunger.
4. The friction measuring device according to claim 1, wherein a ball bushing is disposed on the frame along the horizontal direction, the detecting mechanism further includes a connecting rod rotatably disposed in the ball bushing, and the connecting rod is movable along an axial direction of the ball bushing, one end of the connecting rod is connected to the swing arm, and the other end of the connecting rod is connected to the pressure loading mechanism.
5. A friction measuring device as claimed in any one of claims 1 to 4 wherein said pressure loading mechanism comprises a pulley holder, a pulley, a pull rope and a weight, said pulley holder is connected to said frame, said pulley is rotatably disposed on said pulley holder, one end of said pull rope is connected to said swing arm, and the other end is connected to said weight after passing around said pulley.
6. The friction measuring device of claim 5, wherein the pull cord comprises a horizontally extending section extending in the horizontal direction for connecting the swing arm and a vertically extending section extending in the vertical direction for connecting the weight.
7. A friction measuring device as claimed in any one of claims 1 to 4 wherein said pressure loading mechanism comprises a spring and a connecting cord, said spring and said connecting cord being horizontally disposed on said frame, said connecting cord having one end connected to said spring and the other end connected to said swing arm, and said connecting cord being tensioned.
8. A friction measuring device as recited in any of claims 1-4, wherein the fixing assembly includes a rotary plate extending along the vertical direction, one side of the rotary plate being connected to the output shaft of the rotary driving member and the other side being used for mounting the sample to be measured, and a fixing member provided on the rotary plate and used for fixing the sample to be measured.
9. The friction measuring device of claim 8, wherein the fixing member is a pressing plate, the pressing plate is detachably mounted on the rotary table, a window is disposed in the middle of the pressing plate, the window is used for exposing a portion of the sample to be measured, and the friction ball can extend into the window.
10. The friction measuring device of claim 9, wherein the retaining assembly further comprises a resilient gasket compressed between the dial and the pressing plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310028767.4A CN115718065A (en) | 2023-01-09 | 2023-01-09 | Friction measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310028767.4A CN115718065A (en) | 2023-01-09 | 2023-01-09 | Friction measuring device |
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| CN115718065A true CN115718065A (en) | 2023-02-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310028767.4A Pending CN115718065A (en) | 2023-01-09 | 2023-01-09 | Friction measuring device |
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|---|---|---|---|---|
| JPH07140023A (en) * | 1993-11-16 | 1995-06-02 | Dainippon Ink & Chem Inc | Apparatus for measuring friction of disk surface |
| CN201034896Y (en) * | 2007-04-05 | 2008-03-12 | 张国珍 | Frictional wear tester |
| CN107340087A (en) * | 2017-05-27 | 2017-11-10 | 青岛理工大学 | A kind of analogue measurement device of high stress contact lubricating oil oil film frictional force |
| CN210198886U (en) * | 2019-06-03 | 2020-03-27 | 兰州华汇仪器科技有限公司 | Rotary friction and wear tester |
| CN114965254A (en) * | 2022-05-11 | 2022-08-30 | 合肥工业大学 | Rotary tribology tester and test method for simulating low-temperature fluid lubrication condition |
| CN115060616A (en) * | 2022-06-17 | 2022-09-16 | 广东省医疗器械质量监督检验所 | Flexible centering wear device for testing wear resistance of orthodontic appliance |
-
2023
- 2023-01-09 CN CN202310028767.4A patent/CN115718065A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07140023A (en) * | 1993-11-16 | 1995-06-02 | Dainippon Ink & Chem Inc | Apparatus for measuring friction of disk surface |
| CN201034896Y (en) * | 2007-04-05 | 2008-03-12 | 张国珍 | Frictional wear tester |
| CN107340087A (en) * | 2017-05-27 | 2017-11-10 | 青岛理工大学 | A kind of analogue measurement device of high stress contact lubricating oil oil film frictional force |
| CN210198886U (en) * | 2019-06-03 | 2020-03-27 | 兰州华汇仪器科技有限公司 | Rotary friction and wear tester |
| CN114965254A (en) * | 2022-05-11 | 2022-08-30 | 合肥工业大学 | Rotary tribology tester and test method for simulating low-temperature fluid lubrication condition |
| CN115060616A (en) * | 2022-06-17 | 2022-09-16 | 广东省医疗器械质量监督检验所 | Flexible centering wear device for testing wear resistance of orthodontic appliance |
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Application publication date: 20230228 |