CN111759052A - Method and device for measuring static friction coefficient of sole - Google Patents
Method and device for measuring static friction coefficient of sole Download PDFInfo
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- CN111759052A CN111759052A CN202010691977.8A CN202010691977A CN111759052A CN 111759052 A CN111759052 A CN 111759052A CN 202010691977 A CN202010691977 A CN 202010691977A CN 111759052 A CN111759052 A CN 111759052A
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- information
- human body
- measuring
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- pull rope
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- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43D—MACHINES, TOOLS, EQUIPMENT OR METHODS FOR MANUFACTURING OR REPAIRING FOOTWEAR
- A43D1/00—Foot or last measuring devices; Measuring devices for shoe parts
- A43D1/08—Measuring devices for shoe parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/02—Measuring coefficient of friction between materials
Abstract
The invention discloses a method and a device for measuring the static friction coefficient of a sole, comprising the following steps: the following information is obtained: human body gravity information, angle information and tension information; the human body gravity information is used for representing the sum P of the weight of the human body and the weight of the shoes; the angle information comprises an included angle a between the pull rope and the horizontal plane; the tension information comprises a tension value Fc measured by a sensor fixed on the pull rope; acquiring a friction force value Fx and a positive pressure Fy based on the information, wherein Fx is Fc + cosa, Fy is P + Fc + sina; the coefficient of friction f is obtained as Fx/Fy. The method and the device provided by the invention have the advantages that the measuring method is simple and convenient, the cost is low, the real ground holding force of a person actually standing on the ground can be simulated, and the friction coefficient of the human body in different standing postures can be simulated to meet the subsequent production requirements.
Description
Technical Field
The invention relates to the shoemaking industry, in particular to a method and a device for measuring the static friction coefficient of a sole.
Background
For a shoe making enterprise, the prepared sole needs to be tested corresponding to the ground gripping force of road surfaces with different road conditions, and the follow-up sole production formula or design is adjusted according to the friction coefficient condition measured by the sample so as to optimally improve the ground gripping capability of the sole.
The existing equipment for measuring the static friction coefficient of the sole has certain defects, the measured friction coefficient is distorted, and the actual grip force is inconsistent with the test result or even deviates from the test result after market feedback. The reason is as follows: firstly, the existing static friction coefficient test mode adopts a heavy object to test on a fixed inclined plane (namely a measurement object with fixed weight), the measured value cannot simulate the value of a consumer when the consumer really wears shoes to stand on the ground, and further cannot simulate the friction value measurement of a person in a standing or sliding (falling) posture, so that the real ground grabbing capacity cannot be objectively reflected; secondly, the equipment of test, its structure is extremely complicated, and is with high costs, and the step of test is loaded down with trivial details, needs a plurality of personnel to assist just can realize, produces error easily in the process.
In summary, the conventional device and method for measuring the static friction coefficient of the sole need to be further improved.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a method and a device for measuring the static friction coefficient of a sole, which have the advantages of simple structure, reasonable design, easy realization, simple and convenient measuring method and low cost, can simulate the real ground holding force of a human body on the ground and can simulate the friction coefficient of the human body in different standing postures so as to meet the requirements of subsequent production.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for measuring the static coefficient of friction of a shoe sole, comprising:
the following information is obtained: human body gravity information, angle information and tension information; wherein the content of the first and second substances,
the human body gravity information is used for representing the sum P of the weight of the human body and the weight of the shoes;
the angle information comprises an included angle a between the pull rope and the horizontal plane;
the tension information comprises a tension value Fc measured by a sensor fixed on the pull rope;
acquiring a friction force value Fx and a positive pressure Fy based on the information, wherein:
Fx＝Fc*cosa、
Fy＝P+Fc*sina、
calculating a friction coefficient f based on the information; wherein f is Fx/Fy.
Further, the angle information obtains an included angle (a) between the pull rope and the horizontal plane through an angle measuring instrument.
Further, the angle information acquisition mode is as follows:
obtaining rope length information including a measured rope length value B;
the leg length information comprises a distance value C between a fixed point of one end of the pull rope fixed on the human body and an intersection point of the sole falling on the horizontal plane;
the distance information between the human body and the stay cord fixed point comprises a distance value L from an intersection point of the sole falling on the horizontal plane to an intersection point of the other end of the stay cord and the horizontal plane;
obtaining an included angle a based on the information, wherein a ═ arccos [ (B)2+L2-C2)/2BL]。
A device for measuring the static friction coefficient of a sole comprises a testing surface, a pull rope, a tension sensor and an information acquisition component;
one end of the pull rope is fixed on the ground or the horizontal plane, and the other end of the pull rope is used for fixing the human body to be detected;
the tension sensor is arranged on the pull rope and is used for acquiring a tension value Fc;
the information acquisition part is configured to acquire human body gravity information and angle information; the human body gravity information is used for representing the sum P of the weight of the human body and the weight of the sole; the angle information comprises an included angle a between the pull rope and the horizontal plane;
based on the above information, the friction coefficient f is obtained.
Further, the apparatus further comprises:
a processor;
a memory to store processor-executable instructions;
wherein the processor is configured to: processing and obtaining a tension value Fc, gravity information P of a human body and an included angle a;
based on the above information, the friction coefficient f is calculated and stored by the memory.
Further, the information acquisition component of the human body gravity information is a weighing scale.
Furthermore, the test surface comprises a plurality of test ground mats, and each test ground mat is radially arranged by taking the intersection point of the pull rope and the horizontal plane or the ground as the circle center.
Furthermore, the intersection point of the pull rope and the horizontal plane or the ground is a universal bearing.
Furthermore, the device also comprises a safety auxiliary rope, one end of which is fixed on the ceiling or other positions, and the other end of which is fixed with the human body to be measured.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
the method and the device for measuring the static friction coefficient of the sole have the advantages of simple structure, reasonable design, easy realization, simple and convenient measurement method and low cost, can simulate the real ground gripping force of a person on the ground, can simulate the friction coefficient of the human body in different standing postures or sliding in different postures, and can measure the ground gripping force of the sole in a real scene so as to meet the subsequent production requirement.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic perspective view of a device for measuring the static friction coefficient of a sole according to the present invention;
FIG. 2 is a force structure diagram of the method for measuring the static friction coefficient of the sole according to the invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention clearer and clearer, the present invention 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 invention and are not intended to limit the invention.
As shown in fig. 1 and 2, the device for measuring the static friction coefficient of the sole according to the present invention is used for measuring the real friction coefficient when a person stands on the road surface in different scenes, such as glass, marble, sand, mud, etc., after wearing shoes.
The device comprises a test surface 1, a pull rope 2, a tension sensor 3, an information acquisition component, a memory and a processor;
one end of the pull rope 2 is fixed on the ground or a horizontal plane, and the other end of the pull rope is fixed by a person to be tested; the intersection point of the pull rope 2 and the horizontal plane or the ground is a universal bearing 4, namely the universal bearing 4 is fixed on the ground, and the pull rope 2 is wound on the universal bearing 4, so that one end of the pull rope 2 is fixed with the universal bearing 4; the other end of the pull rope 2 is wound on the waist of a tester, the other end of the pull rope is fixed in the lantern ring, and the tester only needs to be sleeved in the lantern ring when testing each time;
the tension sensor 3 is arranged on the pull rope 2; the tension sensor 3 acquires a tension value Fc when the pull rope 2 is pulled by a human body;
the information acquisition part is configured to acquire human body gravity information and angle information;
the human body gravity information is used for representing the sum P of the weight of the human body and the weight of the sole, and can be obtained by a weight scale or other weighing equipment;
the angle information comprises an included angle a between the pull rope 2 and the horizontal plane; the angle information can be obtained in various ways, one of which is that the angle information can be obtained by measuring through an angle measuring instrument, such as a protractor, namely when the pull rope 2 is pulled by a human body, another assistant person directly measures the included angle a between the pull rope 2 and the ground through the protractor;
the test surface 1 comprises a plurality of test ground mats, wherein the upper surfaces of the test ground mats are respectively made of different materials, namely the upper surfaces are made of glass, marble, sand, mud road, turf and the like; each test ground mat is radially arranged by taking the intersection point of the pull rope 2 and the horizontal plane or the ground as the circle center, and a tester can quickly switch from one test ground mat to the other test ground mat for testing, so that the effect of quick detection is realized;
a memory for storing processor-executable instructions and the retrieved coefficient of friction value;
a processor configured to: processing and obtaining a tension value Fc, gravity information P of a human body and an included angle a;
based on the above information, the friction coefficient f is calculated and stored by the memory.
In order to protect the safety of the tester in the test process, a safety auxiliary rope is further arranged, one end of the safety auxiliary rope is fixed with the tester or the lantern ring, and the other end of the safety auxiliary rope is fixed on a ceiling or other positions, so that the safety auxiliary rope plays a role in protecting the human body when the human body falls.
In practical tests, the method for measuring the static friction coefficient of the sole comprises the following steps:
the following information is obtained: human body gravity information, angle information and tension information; wherein the content of the first and second substances,
the human body gravity information is used for representing the sum P of the weight of the human body and the weight of the sole, a tester wearing the shoe is weighed through the weighing scale, the gravity information P is obtained, and the gravity information P is input into the storage.
The tension information includes a tension value Fc measured by a sensor fixed to the pull rope 2; this pulling force value Fc is realized through tension sensor 3, and is fixed with the tester with the other end of stay cord 2, and the tester is through the inclination that constantly changes the health, and pulling force value Fc also constantly changes, and when the sole of the shoes of dress began to slide on the test surface, reached the biggest stiction promptly, and the peak value appeared in pulling force value Fc, and tension sensor 3 notes pulling force value Fc peak value data this moment, inputs it to the accumulator.
The angle information comprises an included angle a between the pull rope 2 and the horizontal plane; the acquisition mode of the included angle a comprises the following two modes, wherein the first mode is to measure through an angle measuring instrument such as a protractor; the other is calculated by the following method:
obtaining rope length information, including a rope length measuring value B, and measuring the length of the rope by a measuring ruler;
the leg length information comprises a distance value C between a fixed point of one end of the pull rope 2 fixed on the human body and an intersection point of the sole falling on the horizontal plane, and the distance value C is measured by a measuring ruler; the distance value C is changed according to the actual situation, when one end of the pull rope 2 is fixed on the leg of a measurer, the distance between the leg and the foot is measured, if one end of the pull rope 2 is fixed on the waist, the distance between the waist and the foot-landing point of the sole is measured from the waist, and the measured value is the distance value C;
the distance information between the human body and the fixed point of the pull rope 2 comprises a distance value L between an intersection point of the sole on the horizontal plane and the intersection bottom of the other end of the pull rope 2 and the horizontal plane, and the distance value L between the foot-falling point and the universal bearing 4 is measured by a measuring ruler;
based on the above information, a triangle formed by the cord length B, the distance value C, and the distance value L from the end of the cord 2 to the foot point can be obtained by the cosine theorem, that is, a ═ arccos [ (B)2+L2-C2)/2BL]And acquiring the included angle a and inputting the included angle a into the storage.
The tension information includes a tension value Fc measured by a sensor fixed to the pull rope 2; this tension value Fc is achieved by the tension sensor 3; after the acquired gravity information P, the peak tension information Fc and the included angle a are recorded by the memory, the processor is used for processing the gravity information P, the peak tension information Fc and the included angle a
Calculating the friction force value Fx and the positive pressure Fy by the following formulas
Wherein:
Fx＝Fc*cosa、
Fy＝P+Fc*sina；
after the friction value Fx and the positive pressure Fy are obtained, the maximum static friction coefficient f can be obtained,
calculating a friction coefficient f based on the information; wherein f ═ Fx/Fy; finally, raw materials and processes in subsequent production are adjusted according to the measured friction coefficient so as to obtain the sole with stronger ground holding power.
The method and the device for measuring the static friction coefficient of the sole provided by the invention have the advantages of simple structure, reasonable design, easiness in implementation, simplicity and convenience in measuring method, low cost, capability of simulating the real ground gripping force of a person on the ground, capability of simulating the friction coefficient of the human body in different standing postures or sliding in different postures, capability of measuring the ground gripping force of the sole in a real scene by real personnel, capability of meeting the follow-up production requirement and optimization improvement, and more accuracy and reasonability compared with the existing measuring method and device in the market.
While the foregoing description shows and describes the preferred embodiments of the present invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A method for measuring the static coefficient of friction of a shoe sole, comprising:
the following information is obtained: human body gravity information, angle information and tension information; wherein the content of the first and second substances,
the human body gravity information is used for representing the sum (P) of the weight of the human body and the weight of the shoes;
the angle information comprises an included angle (a) between the pull rope and the horizontal plane;
the tension information comprises a tension value (Fc) measured by a sensor fixed on the pull rope;
acquiring a friction value (Fx) and a positive pressure (Fy) based on the information, wherein:
Fx＝Fc*cosa、
Fy＝P+Fc*sina、
calculating a friction coefficient (f) based on the information; wherein f is Fx/Fy.
2. The method for measuring the static friction coefficient of a shoe sole according to claim 1, wherein the angle information is obtained by an angle measuring instrument by obtaining an angle (a) between the pulling rope and a horizontal plane.
3. A method for measuring the static coefficient of friction of a shoe sole according to claim 1,
the angle information acquisition mode is as follows:
obtaining rope length information including a measured rope length value (B);
the leg length information comprises a distance value (C) between a fixed point of one end of the pull rope fixed on the human body and an intersection point of the sole falling on the horizontal plane;
the distance information between the human body and the stay cord fixed point comprises a distance value (L) from an intersection point of the sole falling on the horizontal plane to an intersection point of the other end of the stay cord and the horizontal plane;
acquiring an included angle (a) based on the information, wherein a ═ arccos [ (B)2+L2-C2)/2BL]。
4. A device for measuring the static friction coefficient of a sole is characterized by comprising a testing surface, a pull rope, a tension sensor and an information acquisition component;
one end of the pull rope is fixed on the ground or the horizontal plane, and the other end of the pull rope is used for fixing the human body to be detected;
the tension sensor is arranged on the pull rope and is used for acquiring a tension value (Fc);
the information acquisition part is configured to acquire human body gravity information and angle information; the human body gravity information is used for representing the sum (P) of the weight of the human body and the weight of the sole; the angle information comprises an included angle (a) between the pull rope and the horizontal plane;
based on the above information, a friction coefficient (f) is acquired.
5. An apparatus for measuring the static coefficient of friction of a shoe sole according to claim 4, further comprising:
a processor;
a memory to store processor-executable instructions;
wherein the processor is configured to: processing to obtain a tension value (Fc), gravity information (P) of a human body and an included angle (a);
based on the above information, the friction coefficient (f) is calculated and stored by the memory.
6. The apparatus for measuring the static friction coefficient of shoe sole according to claim 4 or 5, wherein said information acquisition means of the information on the weight of human body is a weight scale.
7. The apparatus for measuring the static friction coefficient of a shoe sole according to claim 6, wherein said test surface comprises a plurality of test mats, each of which is radially arranged with the intersection point of the pulling rope with the horizontal plane or the ground as a center.
8. The apparatus for measuring the static friction coefficient of a shoe sole according to claim 7, wherein the intersection point of the pulling rope with the horizontal plane or the ground is a universal bearing.
9. The apparatus for measuring the static friction coefficient of shoe soles according to claim 4, further comprising a safety auxiliary string having one end fixed to the ceiling or other locations and the other end fixed to the human body to be measured.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010691977.8A CN111759052A (en) | 2020-07-17 | 2020-07-17 | Method and device for measuring static friction coefficient of sole |
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| CN202010691977.8A CN111759052A (en) | 2020-07-17 | 2020-07-17 | Method and device for measuring static friction coefficient of sole |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117322704A (en) * | 2023-12-01 | 2024-01-02 | 晋江玖富隆新材料股份公司 | Slipper anti-skid performance detection device and detection method thereof |
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2020
- 2020-07-17 CN CN202010691977.8A patent/CN111759052A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117322704A (en) * | 2023-12-01 | 2024-01-02 | 晋江玖富隆新材料股份公司 | Slipper anti-skid performance detection device and detection method thereof |
| CN117322704B (en) * | 2023-12-01 | 2024-02-13 | 晋江玖富隆新材料股份公司 | Slipper anti-skid performance detection device and detection method thereof |
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