CN111759052A - A method and device for measuring the coefficient of static friction of shoe soles - Google Patents

Abstract

The invention discloses a method and a device for measuring the coefficient of static friction of shoe soles. P; the angle information, which includes the angle a between the pull rope and the horizontal plane; the tension information, including the pull force value Fc measured by the sensor fixed on the pull rope; based on the above information, the friction force value Fx and Positive pressure Fy, Fx=Fc*cosa, Fy=P+Fc*sina; the friction coefficient f=Fx/Fy can be obtained. The present invention provides a method and a device, the measurement method is simple, the cost is low, and the real grip force of a person standing on the ground can be simulated, and the friction coefficient of the human body in different standing postures can be simulated at the same time, so as to meet the subsequent production requirements.

Description

A method and device for measuring the coefficient of static friction of shoe soles

technical field

The invention relates to the footwear industry, in particular to a method and a device for measuring the static friction coefficient of soles.

Background technique

For shoe-making enterprises, the grip of the prepared soles corresponding to different road conditions needs to be tested, and according to the friction coefficient measured by the samples, the subsequent sole production formula or design is adjusted, in order to optimize and improve the sole's grip ability.

The existing equipment for measuring the static friction coefficient of soles has certain defects, and the measured friction coefficient is distorted. After feedback from the market, its actual grip does not match the test results, or even deviates from it. The reasons are as follows: First of all, the existing static friction coefficient test method uses a heavy object to test on a fixed slope (that is, a fixed weight measurement object), and the measured value cannot simulate the actual value of the consumer standing on the ground wearing shoes. The friction value measurement under the posture of standing or sliding (falling) cannot be simulated, and the real grip ability cannot be objectively reflected; secondly, the structure of the test equipment is extremely complex, the cost is high, the test steps are cumbersome, and it requires many It can only be achieved with the assistance of individual personnel, and errors are prone to occur in the process.

To sum up, the existing devices and methods for measuring the static friction coefficient of soles need to be further improved.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the problems in the prior art, and to provide a method and device for measuring the coefficient of static friction of soles, which has a simple structure, a reasonable design and is easy to implement, the measurement method is simple, the cost is low, and it can simulate the real The real grip of standing on the ground can also simulate the friction coefficient of the human body in different standing positions to meet the subsequent production needs.

To achieve the above object, the present invention adopts the following technical solutions:

A method for measuring the coefficient of static friction of shoe soles, comprising:

Obtain the following information: human body gravity information, angle information and tension information; among them,

the human body gravity information, which is used to characterize the sum P of the body weight and the shoe weight;

the angle information, which includes the angle a between the drawstring and the horizontal plane;

the tension information, which includes the tension value Fc measured by the sensor fixed on the drawstring;

The friction force value Fx and the positive pressure Fy are obtained based on the above information, where:

Fx=Fc*cosa,

Fy=P+Fc*sina,

Based on the above information, the friction coefficient f is calculated; where f=Fx/Fy.

Further, the angle information is obtained by using an angle measuring instrument to obtain the included angle (a) between the pull rope and the horizontal plane.

Further, the method of obtaining the angle information is:

Obtain rope length information, including measuring rope length value B;

Leg length information, including measuring and obtaining the distance value C between the fixed point where one end of the drawstring is fixed on the human body to the intersection point where the sole falls on the horizontal plane;

The distance information between the human body and the fixed point of the drawstring, including measuring and obtaining the distance value L between the intersection of the sole falling on the horizontal plane and the intersection of the other end of the drawstring and the horizontal plane;

The included angle a is obtained based on the above information, where a=arccos[(B ² +L ² -C ² )/2BL].

A device for measuring the coefficient of static friction of shoe soles, the device includes a test surface, a pull rope, a tension sensor and an information acquisition component;

One end of the pulling rope is fixed on the ground or a horizontal plane, and the other end is fixed for the human body to be tested;

the tension sensor, which is installed on the pull rope and used to obtain the tension value Fc;

The information acquisition component is configured to acquire human body gravity information and angle information; the human body gravity information is used to represent the sum P of the body weight and the sole weight; the angle information includes the difference between the drawstring and the horizontal plane. the included angle a;

Based on the above information, the friction coefficient f is obtained.

Further, the device also includes:

processor;

memory for storing processor executable instructions;

Wherein, the processor is configured to: process and obtain the pulling force value Fc, the gravity information P of the human body, and the 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 weight scale.

Further, the test surface includes a plurality of test ground pads, and each of the test ground pads is radially arranged with the intersection of the pull rope and the horizontal plane or the ground as the center of the circle.

Further, the intersection of the pulling rope and the horizontal plane or the ground is a universal bearing.

Further, the device also includes a safety auxiliary rope, one end of which is fixed to the ceiling or other positions, and the other end is fixed to the human body to be tested.

Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

The method and the device for measuring the static friction coefficient of the sole provided by the present invention have the advantages of simple structure, reasonable design and easy realization, simple measurement method and low cost, and can simulate the real grip force of a person actually standing on the ground, and at the same time can Simulate the friction coefficient of the human body in different standing postures or sliding in different postures, and measure the grip ability of the soles of real people in the field to meet the subsequent production needs.

Description of drawings

The accompanying drawings described herein are used to provide further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached image:

Fig. 1 is the three-dimensional structure schematic diagram of the device for measuring the static friction coefficient of sole according to the present invention;

FIG. 2 is a schematic diagram of the force structure of the method for measuring the static friction coefficient of the sole according to the present invention.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and more comprehensible, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

As shown in Figures 1 and 2, a device for measuring the coefficient of static friction of shoe soles according to the present invention is used to measure the real coefficient of friction when a person wears shoes and stands on the road surface of different scenes. The different scenes here can be Glass, marble, sand, dirt roads and other pavements.

The device includes a test surface 1, a pulling rope 2, a tension sensor 3, an information acquisition component, a storage, and a processor;

One end of the pull rope 2 is fixed on the ground or a horizontal plane, and the other end is fixed for the person to be tested; here, the intersection point of the pull rope 2 and the horizontal plane or the ground is a universal bearing 4, that is, a universal bearing 4 is fixed on the ground. , the pulling rope 2 is wound on the universal bearing 4, so that one end of the pulling rope 2 is fixed with the universal bearing 4; the other end is wound around the waist of the tester. Inside, the tester only needs to put it into the collar for each test;

The tension sensor 3 is installed on the pull cord 2; the tension sensor 3 obtains the tension value Fc when the pull cord 2 is pulled by the human body;

the information acquisition component, which is configured to acquire human body gravity information and angle information;

The human body gravity information, which is used to represent the sum P of the body weight and the sole weight, can be obtained through a weight scale, and of course, it can also be obtained through other weighing equipment;

The angle information includes the angle a between the pull rope 2 and the horizontal plane; the angle information of the present invention can be obtained in various ways. When the rope 2 is pulled by the human body, another assistant directly measures the angle a between the rope 2 and the ground through the protractor;

The test surface 1 includes several test floor mats, and the upper surfaces of the test floor mats here are made of different materials, that is, the upper surface is glass, marble, sand, dirt road, turf, etc.; 2. The intersection with the horizontal plane or the ground is radially arranged at the center of the circle, and the tester can quickly switch from one of the test pads to another test pad to achieve the effect of rapid detection;

storage for storing processor executable instructions and the acquired friction coefficient value;

a processor, the processor is configured to: process and obtain the pulling force value Fc, the gravity information P of the human body, and the 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 during the test, a safety auxiliary rope is also provided, one end of which is fixed to the tester or the collar, and the other end is fixed to the ceiling or other positions to protect the human body when it falls.

During actual testing, the method for measuring the coefficient of static friction of soles of the present invention includes the following:

Obtain the following information: human body gravity information, angle information and tension information; among them,

The human body gravity information is used to characterize the sum P of the body weight and the sole weight. The tester who wears the shoes is weighed by a scale, and the gravity information P is obtained and input into the storage.

The tension information includes the tension value Fc measured by the sensor fixed on the pull cord 2; this tension value Fc is realized by the tension sensor 3, which fixes the tester and the other end of the pull cord 2, and the tester changes the The inclination angle of the body, the tension value Fc also changes constantly. When the sole of the wearing shoe starts to slide on the test surface, the maximum static friction force is reached, and the tension value Fc peaks. The tension sensor 3 records the peak data of the tension value Fc at this time. , enter it into the memory.

The angle information includes the angle a between the pull cord 2 and the horizontal plane; the angle a can be acquired in the following two ways, the first is measured by an angle measuring instrument such as a protractor; the other is as follows It is calculated that this method is specifically:

Obtain rope length information, including measuring the rope length value B, and measure the length of the rope through a measuring ruler;

Leg length information, including measuring and obtaining the distance value C between the fixed point where one end of the drawstring 2 is fixed on the human body to the intersection point where the sole falls on the horizontal plane, and the distance value C is also measured by a measuring ruler; the distance value C here is based on the actual The situation is changed, when one end of the rope 2 is fixed on the leg of the measuring person, that is, the length of the leg is measured. If one end of the rope 2 is fixed to the waist, that is, the distance from the waist to the footing point of the sole is measured from the waist, and the measured value is is the distance value C;

The distance information between the human body and the fixed point of the rope 2, including measuring the distance L between the intersection of the sole falling on the horizontal plane and the intersection of the other end of the rope 2 and the horizontal plane, and also measuring the footing point to the universal bearing with a measuring ruler The distance value L between 4;

Based on the above information, the triangle formed by the rope length B, the distance value C, and the distance value L from the two ends of the rope to the landing point can be obtained by the cosine law, that is, a=arccos[(B ² +L ² -C ² )/ 2BL] to obtain the included angle a, and input it to the memory.

The tensile force information includes the tensile force value Fc measured by the sensor fixed on the pull rope 2; this tensile force value Fc is realized by the tensile force sensor 3; the storage records the above-obtained gravity information P, peak tensile force information Fc and clip After angle a, through the processor

Calculate the friction force value Fx and the positive pressure Fy with the following formulas

in:

Fx=Fc*cosa,

Fy=P+Fc*sina;

After obtaining the friction force value Fx and the positive pressure Fy, the maximum static friction coefficient f can be obtained,

Based on the above information, the friction coefficient f is calculated; where f=Fx/Fy; finally, the raw materials and processes in subsequent production are adjusted according to the measured friction coefficient, so as to obtain a sole with stronger grip.

The method and the device for measuring the static friction coefficient of the sole provided by the present invention have the advantages of simple structure, reasonable design and easy realization, simple measurement method and low cost, and can simulate the real grip force of a person actually standing on the ground, and at the same time can Simulate the friction coefficient of the human body in different standing postures or sliding in different postures, and measure the gripping ability of the soles of real people in the field scene, so as to meet the subsequent production needs, optimize and improve, compared with the existing test methods and The device is more accurate and reasonable.

The foregoing specification illustrates and describes preferred embodiments of the present invention, and as previously stated, it should be understood that the present invention is not limited to the form disclosed herein, and should not be construed as an exclusion of other embodiments, but may be used in a variety of other Combinations, modifications and environments are possible within the scope of the inventive concepts described herein, from the above teachings or from skill or knowledge in the relevant fields. However, modifications and changes made by those skilled in the art do not depart from the spirit and scope of the present invention, and should all fall within the protection scope of the appended claims of the present invention.

Claims (9)

1. a method for measuring sole static friction coefficient, is characterized in that, comprises: Obtain the following information: human body gravity information, angle information and tension information; among them, the body gravity information, which is used to characterize the sum of body weight and shoe weight (P); the angle information, which includes the angle (a) between the pull cord and the horizontal plane; The pulling force information, which includes the pulling force value (Fc) measured by the sensor fixed on the pulling rope; The frictional force value (Fx) and positive pressure (Fy) are obtained based on the above information, where: Fx=Fc*cosa, Fy=P+Fc*sina, Based on the above information, the coefficient of friction (f) is calculated; where f=Fx/Fy. 2 . The method for measuring the coefficient of static friction of shoe soles according to claim 1 , wherein the angle information is obtained by using an angle measuring instrument to obtain the angle (a) between the drawstring and the horizontal plane. 3 . 3. a kind of method for measuring the coefficient of static friction of sole as claimed in claim 1, is characterized in that, The method of obtaining the angle information is as follows: Obtain rope length information, including the measured rope length value (B); Leg length information, including measuring and obtaining the distance value (C) between the fixed point where one end of the drawstring is fixed to the human body to the intersection point where the sole falls on the horizontal plane; The distance information between the human body and the fixed point of the drawstring, including measuring and obtaining the distance value (L) between the intersection of the sole falling on the horizontal plane and the intersection of the other end of the drawstring and the horizontal plane; The included angle (a) is obtained based on the above information, where a=arccos[(B ² +L ² -C ² )/2BL]. 4. A device for measuring the coefficient of static friction of soles, characterized in that the device comprises a test surface, a pull rope, a tension sensor and an information acquisition component; One end of the pulling rope is fixed on the ground or a horizontal plane, and the other end is fixed for the human body to be tested; the tension sensor, which is installed on the pull rope and used to obtain the tension value (Fc); The information acquisition component is configured to acquire human body gravity information and angle information; the human body gravity information is used to represent the sum (P) of the body weight and the sole weight; the angle information includes the drawstring and the shoe sole. the angle between the horizontal planes (a); Based on the above information, the friction coefficient (f) is obtained. 5. a kind of device for measuring the coefficient of static friction of sole as claimed in claim 4, is characterized in that, this device also comprises: processor; memory for storing processor executable instructions; Wherein, the processor is configured to: process and obtain the pulling force value (Fc), the gravity information (P) of the human body and the included angle (a); Based on the above information, the friction coefficient (f) is calculated and stored by the memory. 6 . The device for measuring the coefficient of static friction of shoe soles according to claim 4 or 5 , wherein the information acquisition component of the human body gravity information is a weight scale. 7 . 7. A device for measuring the coefficient of static friction of shoe soles as claimed in claim 6, wherein the test surface comprises several test ground pads, and each test ground pad takes the intersection of the drawstring and the horizontal plane or the ground as the center of the circle. Radial arrangement. 8 . The device for measuring the coefficient of static friction of shoe soles according to claim 7 , wherein the point of intersection of the drawstring and the horizontal plane or the ground is a universal bearing. 9 . 9 . The device for measuring the coefficient of static friction of shoe soles as claimed in claim 4 , wherein the device further comprises a safety auxiliary rope, one end of which is fixed to the ceiling or other positions, and the other end is fixed to the human body to be measured. 10 .

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