Push-pull dynamometer for textile buckling force test

Abstract

The invention relates to the technical field of textile buckling force testing, in particular to a push-pull dynamometer for textile buckling force testing, which comprises a casing, a displacement unit arranged in the casing in a sliding and penetrating manner, a light chuck with one end connected with the displacement unit, a driven unit driven by the displacement unit, and a measurement display unit connected with the driven unit, the light chuck is arranged outside the machine shell, and the driven unit is arranged inside the machine shell. The device has the advantages that high-precision measurement and real-time monitoring are achieved through low-friction design, multi-sensing-element layout and force and displacement balanced transmission of the equal-arm-length lever, a stable and reliable measurement result is provided, meanwhile, a light chuck and modular design are adopted, operation is easy and convenient, and the device is suitable for performance evaluation of various textiles.

Description

Technical Field

[0001] The invention relates to the technical field of textile buckling force testing, in particular to a push-pull dynamometer for textile buckling force testing. Background Art

[0002] As robotics technology enters the field of textile and garment processing, the force relationship between textiles and mechanical grippers has become a new area that needs to be defined and studied. The buckling force of textiles refers to the elastic resistance formed by the arching of textiles under the pinching of external forces. This force is an important factor affecting the success of the robot gripping textiles. However, due to the weak buckling force of textiles, the existing push-pull force gauges are not applicable and require structural innovation and transformation. Summary of the invention

[0003] In view of the above problems or problems existing in the prior art, the present invention is proposed.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: a push-pull dynamometer for testing the flexural force of textiles, comprising a housing, a displacement unit slidably arranged in the housing, a lightweight chuck connected to the displacement unit at one end, a driven unit driven by the displacement unit, and a measurement display unit connected to the driven unit, wherein the lightweight chuck is arranged on the outside of the housing, and the driven unit is arranged on the inside of the housing.

[0005] As a preferred solution of the push-pull dynamometer for testing the flexural force of textiles of the present invention, the displacement unit includes a lightweight push-pull rod fixedly connected to a lightweight chuck at one end, a limit assembly arranged inside the casing and used to limit the lightweight push-pull rod, and a displacement rod connected to the other end of the lightweight push-pull rod, wherein the lightweight push-pull rod is movably arranged in the casing.

[0006] As a preferred embodiment of the push-pull dynamometer for testing the flexural force of textiles of the present invention, the driven unit comprises a connecting member connected to the displacement member at one end, and an equal-arm-length lever connected to the other end of the connecting member;

[0007] The equal-arm-length lever is connected to the casing through a rotating shaft.

[0008] As a preferred solution of the push-pull dynamometer for testing the flexural force of textiles of the present invention, a reset structure and a micro switch are arranged inside the equal-arm-length lever.

[0009] As a preferred solution of the push-pull dynamometer for testing the flexural force of textiles of the present invention, the measuring display unit includes a power supply component, and a digital display module and a displacement sensing component powered by the power supply component.

[0010] As a preferred solution of the push-pull dynamometer for testing the flexural force of textiles of the present invention, the displacement sensing assembly includes a displacement sensing element arranged on a lightweight push-pull rod, and an analog-to-digital conversion module connected to the electrical signal of the displacement sensing element.

[0011] As a preferred solution of the push-pull force gauge for testing the flexural force of textiles of the present invention, the analog-to-digital conversion module is electrically connected to the digital display module.

[0012] As a preferred solution of the push-pull dynamometer for testing the flexural force of textiles of the present invention, the power supply component is a power module.

[0013] As a preferred solution of the push-pull dynamometer for testing the flexural force of textiles of the present invention, the friction coefficient μ between the lightweight push-pull rod and the limit assembly is less than 0.10.

[0014] As a preferred embodiment of the push-pull dynamometer for testing the flexural force of textiles of the present invention, the sum of the masses of the lightweight clamp and the lightweight push-pull rod is the first mass;

[0015] The value of the first mass is greater than or equal to 10 g and less than or equal to 30 g.

[0016] The beneficial effects of the present invention are as follows: through low-friction design, multi-sensor element layout and balanced transmission of force and displacement of equal-arm-length levers, high-precision measurement and real-time monitoring are achieved, stable and reliable measurement results are provided, and at the same time, a lightweight chuck and modular design are adopted, which is easy to operate and suitable for performance evaluation of various textiles. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0018] Figure 1 Schematic cross-sectional view of a push-pull dynamometer for testing the flexural force of textiles.

[0019] Figure 2 This is a test data sheet for the push-pull force gauge used for the flexural force test of textiles. DETAILED DESCRIPTION

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0021] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0023] Example 1

[0024] Reference Figure 1 , which is the first embodiment of the present invention, provides a push-pull dynamometer for testing the flexural force of textiles, comprising a housing 101, a displacement unit 200 slidably disposed in the housing 101, a lightweight chuck 102 connected to the displacement unit 200 at one end, a driven unit 300 driven by the displacement unit 200, and a measurement display unit 400 connected to the driven unit 300, wherein the lightweight chuck 102 is disposed outside the housing 101, and the driven unit 300 is disposed inside the housing 101.

[0025] It should be noted that the lightweight chuck 102 is used to fix the fabric to be tested. Furthermore, the lightweight chuck 102 is provided to minimize the additional load on the fabric, thereby obtaining a more accurate test result.

[0026] Furthermore, the displacement unit 200 includes a lightweight push-pull rod 201 with one end fixedly connected to the lightweight clamp 102, a limiting assembly 202 arranged inside the housing 101 and used to limit the lightweight push-pull rod 201, and a displacement rod 203 connected to the other end of the lightweight push-pull rod 201, wherein the lightweight push-pull rod 201 is movably arranged in the housing 101.

[0027] It should be noted that the lightweight push-pull rod 201 is connected to the lightweight chuck 102 and passes through the limit assembly 202. The lightweight push-pull rod 201 moves linearly along the limit assembly 202. Furthermore, the movement of the lightweight push-pull rod 201 synchronously drives the displacement rod 203 to move.

[0028] Furthermore, the driven unit 300 includes a connecting member 301 having one end connected to the displacement member, and an equal arm length lever 302 connected to the other end of the connecting member 301;

[0029] It should be noted that the displacement rod 203 moves through the connecting member 301 to drive the equal-arm-length lever 302 to rotate or move.

[0030] The equal-arm-length lever 302 is connected to the housing 101 via a rotating shaft.

[0031] Preferably, the equal-arm-length lever 302 has the feature that its two arms are of equal length, which not only prevents deviation in the force transmission process and ensures measurement accuracy, but also can amplify the small displacement of the lightweight push rod so that tiny displacement changes can be accurately detected.

[0032] Furthermore, the equal-arm-length lever 302 is provided with a reset structure and a micro switch, wherein the reset structure may be a spring.

[0033] Furthermore, the measurement and display unit 400 includes a power supply component 401 , and a digital display module 402 and a displacement sensor component 403 powered by the power supply component 401 .

[0034] Furthermore, the displacement sensing assembly 403 includes a displacement sensing element 403a disposed on the lightweight push-pull rod 201 and an analog-to-digital conversion module 403b electrically connected to the displacement sensing element 403a, wherein the equal-arm-length lever 302 is also provided with a displacement sensing element 403a.

[0035] It should be noted that the displacement sensor assembly 403 is used to measure the displacement of the lightweight push-pull rod 201 and convert the mechanical movement into an electrical signal.

[0036] Furthermore, the analog-to-digital conversion module 403 b is electrically connected to the digital display module 402 .

[0037] It should be noted that the analog-to-digital conversion module 403b converts and processes the electrical signal of the displacement sensor component 403 and transmits it to the digital display module 402 so as to display the displacement of the push-pull rod and the corresponding force value in real time.

[0038] Furthermore, the power supply component 401 is a power module 401a.

[0039] It should be noted that the displacement sensing component 403 measures the displacement and converts it into an electrical signal. After being processed by the digital conversion module, the buckling force value is displayed in real time on the digital display module 402. The entire system is powered by the power module 401a, and the measurement accuracy is ensured by the micro switch installed in the equal-arm-length lever 302.

[0040] Furthermore, the friction coefficient μ between the lightweight push-pull rod 201 and the limiting assembly 202 is less than 0.10.

[0041] Preferably, the friction coefficient is less than 0.10, so that the friction between the lightweight push-pull rod 201 and the limiting structure is very small. A low friction coefficient can reduce energy loss and error caused by friction, thereby improving the accuracy and sensitivity of measurement.

[0042] When in use, the fabric is fixed by the lightweight clamp 102, and the lightweight push-pull rod 201 is used to apply force to cause the fabric to bend. The displacement of the lightweight push-pull rod 201 is converted into an electrical signal by the displacement sensor component 403, and after being processed by the digital conversion module, the buckling force value is displayed in real time on the digital display module 402.

[0043] In summary, the beneficial effects of the push-pull force gauge for testing the flexural force of textiles of the present invention are that high-precision measurement and real-time monitoring are achieved through low-friction design, multi-sensor element layout and balanced transmission of force and displacement of equal-arm-length levers 302, and stable and reliable measurement results are provided. At the same time, the lightweight chuck 102 and modular design are adopted, which is easy to operate and suitable for performance evaluation of various textiles.

[0044] Example 2

[0045] Reference Figure 2 , which is the second embodiment of the present invention, and this embodiment provides a push-pull dynamometer for testing the flexural force of textiles, which includes a lightweight chuck 102 and a lightweight push-pull rod 201, the sum of the masses of which is the first mass; the value of the first mass is greater than or equal to 10g and less than or equal to 30g, and the rest of the content is consistent with Example 1.

[0046] It should be noted that the working principle of the push-pull force gauge is: during the test, the force generated by the object under test causes an internal spring deformation (or a change in the electrical signal of a piezoresistor or other sensor device), and the degree of deformation is proportional to the force generated. In other words, the magnitude of the force generated is obtained by observing the degree of deformation, and the amount of deformation will be operated accordingly through the amplification structure of the push-pull force gauge, and finally the corresponding force magnitude will be displayed on the display device.

[0047] From the perspective of physical principles, this action process conforms to the momentum theorem, that is: impulse I = F·△t, momentum P = m·V, where F is the force acting on mass m (unit: N), △t is the duration of the force, and V is the change in the movement speed of mass m caused by the force.

[0048] According to the momentum theorem, F△t=mV 末 -mV 初 =m(V 末 -V 初 ) It can be seen that if the mass m is larger, the △V obtained by the collision will be smaller, and thus the displacement S=△V*△t will also be smaller; conversely, if the absolute value of the mass m can be reduced, the starting range of the push-pull dynamometer will be greatly reduced, and its test sensitivity (graduation value) will also be greatly improved.

[0049] The following experimental steps were performed by reducing the mass m:

[0050] S1. Determine the yarn count and fabric density of a fabric, input them into ABAQUS for simulation, and obtain the buckling force value that the fabric should theoretically have in ABAQUS simulation.

[0051] S2. Use a push-pull dynamometer (rigid chuck and push-pull rod) to perform buckling force test and obtain the measured value.

[0052] S3, replace the lightweight chuck 102 and the lightweight push-pull rod 201, and use the same experimental method to obtain the measurement value of the lightweight chuck 102.

[0053] S4. Compare the measured values ​​obtained by different quality chuck solutions with the predicted values ​​of ①, infer and verify the correctness of the lightweight theory proposed by the present invention and the preferred range of the lightweight chuck 102 and the lightweight push-pull rod 201.

[0054] The experimental data are detailed in the attached Figure 2 .

[0055] The results of the experiment show that: (1) From the measured values ​​of various tissues and chucks of different masses, it can be seen that as the mass of the chuck decreases, the measured values ​​gradually approach the predicted values ​​of ①, and the trends are consistent.

[0056] (2) Theoretically, as long as there is friction between the components of the measuring equipment, the buckling force of the textile needs to overcome this friction and do work, resulting in energy loss. This is reflected in the measurement practice that the measured buckling force value can only be infinitely close to the simulation prediction value, but it can never be equal to or higher than the simulation prediction value.

[0057] (3) From the perspective of various means of reducing friction between components, reducing the construction mass is conducive to achieving the goal; however, if the construction mass is too low, its strength will easily decay rapidly, causing the entire measurement mechanism to fail.

[0058] In summary, the present invention combines theoretical analysis, simulation experiments and physical experiments to conclude that by reducing the absolute value of the mass m of the chuck and the push-pull rod, the starting range of the push-pull dynamometer will be greatly reduced, and the test sensitivity (graduation value) will also be greatly improved. Furthermore, when the total mass of the lightweight chuck 102 and the lightweight push-pull rod 201 is in the range of 10 to 30 g, the test sensitivity (graduation value) reaches the optimal value.

[0059] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A push-pull dynamometer for testing the flexural force of textiles, characterized in that: include, A housing (101), a displacement unit (200) slidably disposed in the housing (101), a lightweight chuck (102) connected to the displacement unit (200) at one end, a driven unit (300) driven by the displacement unit (200), and a measurement display unit (400) connected to the driven unit (300), wherein the lightweight chuck (102) is disposed outside the housing (101), and the driven unit (300) is disposed inside the housing (101).

2. The push-pull dynamometer for testing the flexural strength of textiles according to claim 1, characterized in that: The displacement unit (200) comprises a lightweight push-pull rod (201) having one end fixedly connected to the lightweight chuck (102), a limit assembly (202) disposed inside the housing (101) and used to limit the lightweight push-pull rod (201), and a displacement rod (203) connected to the other end of the lightweight push-pull rod (201), wherein the lightweight push-pull rod (201) is movably disposed in the housing (101).

3. The push-pull dynamometer for testing the flexural force of textiles according to claim 2, characterized in that: The driven unit (300) comprises a connecting member (301) having one end connected to the displacement member, and an equal-arm-length lever (302) connected to the other end of the connecting member (301); The equal-arm-length lever (302) is connected to the housing (101) via a rotating shaft.

4. The push-pull dynamometer for testing the flexural force of textiles according to claim 3, characterized in that: The equal-arm-length lever (302) is provided with a reset structure and a micro switch.

5. The push-pull dynamometer for testing the flexural force of textiles according to claim 4, characterized in that: The measurement display unit (400) comprises a power supply component (401), and a digital display module (402) and a displacement sensing component (403) powered by the power supply component (401).

6. The push-pull dynamometer for testing the flexural strength of textiles according to claim 5, characterized in that: The displacement sensing component (403) comprises a displacement sensing element (403a) arranged on the lightweight push-pull rod (201), and an analog-to-digital conversion module (403b) electrically connected to the displacement sensing element (403a).

7. The push-pull dynamometer for testing the flexural strength of textiles according to claim 6, characterized in that: The analog-to-digital conversion module (403b) is electrically connected to the digital display module (402).

8. The push-pull dynamometer for testing the flexural strength of textiles according to claim 7, characterized in that: The power supply component (401) is a power module (401a).

9. The push-pull dynamometer for testing the flexural strength of textiles according to claim 8, characterized in that: The friction coefficient μ between the lightweight push-pull rod (201) and the limiting assembly (202) is less than 0.

10.

10. The push-pull dynamometer for testing the flexural strength of textiles according to any one of claims 2 to 9, characterized in that: The sum of the masses of the lightweight chuck (102) and the lightweight push-pull rod (201) is a first mass; The value of the first mass is greater than or equal to 10 g and less than or equal to 30 g.

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