Tension measuring device based on elastic circular ring structure
Through the tensile force measuring device based on the elastic ring structure, the tensile force is measured by the height change of the elastic ring, which solves the problems of small range and low sensitivity of the existing device, and achieves high-precision and portable tensile force measurement.
Patent Information
- Application Number
- CN202310586064.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-05-23
- Publication Date
- 2025-07-18
AI Technical Summary
The existing tensile measuring devices have problems such as small range, low sensitivity, low accuracy, complex structure, high cost and inconvenient portability.
The tensile force measurement device based on the elastic ring structure is adopted. By measuring the static configuration height change of the elastic ring structure under the action of the tension, the tensile force size is calculated by combining the distance measuring sensor and the control device. The structure is simple, easy to use, and the measurement range can be adjusted.
It improves the accuracy and reliability of tensile measurement. The device is small in size, light in weight, easy to carry, strong adaptability, and meets the growing measurement needs.
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Figure CN120333675A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of tensile force measurement, and particularly relates to a tensile force measurement device based on an elastic ring structure. Background Technique
[0002] With the continuous development of science and technology, tensile force measurement devices have been widely used in our production and life, covering industries such as the fiber industry, pharmaceutical industry, automotive industry, packaging industry, and scientific research laboratories. Currently, conventional tensile force measurement devices are mainly divided into electronic tensile force measurement devices and pointer tensile force measurement devices. However, pointer tensile force measurement devices have a small range, low sensitivity, low accuracy, low strength, and a short service life, while electronic tensile force measurement devices have a more complex structure, more internal components, higher manufacturing process requirements, greater weight, higher cost, non-adjustable measurement range, inconvenient to carry, and are difficult to meet the increasingly developing tensile force measurement needs. Summary of the Invention
[0003] The purpose of the present invention is to provide a tensile force measurement device based on an elastic ring structure, which has a simple structure, is easy to use, and can improve the accuracy and reliability of tensile force measurement.
[0004] To achieve the above object, the technical solution adopted by the present invention is: a tensile force measurement device based on an elastic ring structure, characterized in that it includes a housing, four elastic ring structures, a cover plate, a hook, a distance measuring sensor, and a control device. The four elastic ring structures are arranged side by side at equal intervals in the housing, and the bottoms of the four elastic ring structures are fixedly connected to the bottom surface of the housing. The elastic ring structure can change the height of its static configuration under the action of tensile force, and corresponds to different static configuration heights under different tensile forces. The cover plate is fixedly connected to the tops of the four elastic ring structures and is embedded in the housing. The hook is fixedly connected to the upper part of the cover plate so that the four elastic ring structures are evenly stressed when subjected to tensile force, and thus their heights change uniformly. The distance measuring sensor is installed under the cover plate, and its detection direction is downward to measure the change in the height of the elastic ring structure. The distance measuring sensor is electrically connected to the control device on the housing to send the distance measurement data to the control device. The control device calculates the magnitude of the applied tensile force according to the function relationship curve between the applied tensile force and the height of the elastic ring structure.
[0005] Further, the function relationship curve between the applied tensile force and the height of the elastic ring structure is obtained by calculating the equilibrium equation of the static configuration of the elastic ring structure;
[0006] The elastic ring structure deforms under the action of vertical tensile force. At this time, a coordinate system is established, and the lower end point of the elastic ring structure form is set as the origin s0 of the natural coordinate. The elastic ring structure form is symmetric about the y-axis, and the total length is The following differential equations are established:
[0007] x′(s) = cosθ(s), y′(s) = sinθ(s)
[0008] Kθ″(s) - T x sinθ(s) + T y cosθ(s) = 0
[0009] where K is the bending stiffness of the elastic ring structure, s represents the natural coordinate arc length of the elastic ring structure form, the starting point of the natural coordinate is s0, x and y are the Cartesian coordinates of any point on the elastic ring structure form, T x and T y are the internal forces in the x - direction and y - direction of the elastic ring structure form respectively, T x is a constant, T y = F / 4, and F is the pulling force applied to the hook;
[0010] The differential equation system is combined with the continuity conditions: (θ, θ', x, y) is continuous along the elastic ring structure, and the boundary conditions: θ(0) = 0, y(0) = 0, x(0) = 0, that is, the equilibrium configuration of the elastic ring structure under different pulling forces is solved;
[0011] According to the equilibrium equation of the static configuration of the elastic ring structure, the height of the elastic ring structure is related to the pulling force applied to the hook and the bending stiffness of the elastic ring structure; obtaining the functional relationship between the pulling force applied to the hook and the height of the elastic ring structure, the pulling force applied to the hook can be indirectly measured by measuring the height of the elastic ring structure.
[0012] Furthermore, on the condition of keeping the bending stiffness of a single elastic ring structure unchanged, continuously changing the applied pulling force, fitting the functional relationship curve between the height of a single elastic ring structure and the pulling force it receives, the height of a single elastic ring structure has a linear relationship with the pulling force it receives, thus obtaining the functional relationship between the height of the elastic ring structure and the applied pulling force:
[0013] y = kx + b
[0014] where y is the height of the elastic ring structure, k is determined by the bending stiffness of the elastic ring structure, different bending stiffnesses correspond to different k values, x is the pulling force applied to the hook, and b is the initial height of the elastic ring structure when no pulling force is applied.
[0015] Furthermore, by changing the bending stiffness of the elastic ring structure to change the k value, thereby changing the functional relationship between the height of the elastic ring structure and the applied pulling force, and further realizing the adjustment of the measurement range of the pulling force measuring device.
[0016] Further, the cover plate is a square cover plate, the center of the square cover plate coincides with the symmetry center of the four elastic ring structures, and the distance measuring sensor is installed at the center position of the square cover plate.
[0017] Further, a groove is provided at the center of the lower part of the square cover plate, and the distance measuring sensor is installed in the groove of the square cover plate by means of magnetic adsorption; a threaded hole is provided at the center of the upper part of the square cover plate, and the hook is screwed into the threaded hole through the thread at one end.
[0018] Further, the control device includes a display screen, the display screen is embedded on one side surface of the housing, and the control device displays the calculated pulling force on the display screen.
[0019] Compared with the prior art, the present invention has the following beneficial effects: A pulling force measuring device based on an elastic ring structure is provided. The device utilizes the fact that the static configuration height of the elastic ring structure will change under the action of pulling force, and realizes the measurement of pulling force by measuring the height change of the elastic ring structure. The structure is simple, easy to use, and the measurement accuracy and reliability are high. The device is simple to install and calibrate, and can adjust the measurement range by changing the bending stiffness of the elastic ring structure. In addition, the device is small in size, light in weight, easy to carry, easy to integrate, and has strong adaptability, and can meet the growing demand for pulling force measurement. Description of the Drawings
[0020] Figure 1 is a schematic structural diagram of the pulling force measuring device according to an embodiment of the present invention.
[0021] Figure 2 is a schematic overall structure diagram of the pulling force measuring device according to an embodiment of the present invention.
[0022] Figure 3 is a schematic connection structure diagram of the cover plate and the four elastic ring structures in an embodiment of the present invention.
[0023] Figure 4 is a force analysis diagram of a single elastic ring structure under the action of pulling force in an embodiment of the present invention.
[0024] Figure 5 is a graph of the functional relationship between the height of a single elastic ring structure and the pulling force received in an embodiment of the present invention.
[0025] Figure 6 is a graph of the functional relationship between the height of the elastic ring structure and the applied pulling force in an embodiment of the present invention.
[0026] In the figure: 1. Hook; 2. Cover plate; 3. First elastic ring structure; 4. Second elastic ring structure; 5. Third elastic ring structure; 6. Fourth elastic ring structure; 7. Distance measuring sensor; 8. Display screen; 9. Housing. Detailed implementation manners
[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0028] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.
[0029] It should be noted that the terms used herein are only for describing specific implementation manners and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0030] As Figure 1 、 2 shown, this embodiment provides a tensile force measuring device based on an elastic ring structure, including a housing 9, four elastic ring structures (a first elastic ring structure 3, a second elastic ring structure 4, a third elastic ring structure 5, and a fourth elastic ring structure 6), a cover plate 2, a hook 1, a ranging sensor 7, and a control device. The four elastic ring structures 3, 4, 5, and 6 are arranged side by side at equal intervals in the housing 9, and the bottoms of the four elastic ring structures 3, 4, 5, and 6 are fixedly connected to the bottom surface of the housing 9. The elastic ring structure can change the height of its static configuration under the action of tensile force, and corresponds to different static configuration heights under different tensile forces. The cover plate 2 is fixedly connected to the tops of the four elastic ring structures 3, 4, 5, and 6 (as Figure 3 shown) and is embedded in the housing 9. The hook 1 for applying tensile force is fixedly connected to the upper part of the cover plate 2 so that the four elastic ring structures are uniformly stressed when subjected to tensile force, and thus their height changes are consistent. The ranging sensor 7 is installed below the cover plate 2, and its detection direction is downward to measure the change in the height of the elastic ring structure. The ranging sensor 7 is electrically connected to the control device on the housing 9 to send ranging data to the control device. The control device calculates the magnitude of the applied tensile force according to the function relationship curve between the applied tensile force and the height of the elastic ring structure.
[0031] In this embodiment, the cover plate 2 is a square cover plate, the center of the square cover plate coincides with the symmetry center of the four elastic ring structures 3, 4, 5, and 6, and the ranging sensor 7 is installed at the center position of the square cover plate.
[0032] In this embodiment, a groove is provided at the center of the lower part of the square cover plate 2, and the distance measuring sensor 7 is installed in the groove of the square cover plate 2 by means of magnetic adsorption. A threaded hole is provided at the center of the upper part of the square cover plate 2, and the hook 1 is screwed into the threaded hole through the thread at one end.
[0033] In this embodiment, the control device includes a display screen 8, and the display screen 8 is embedded on one side surface of the housing 9. The control device displays the calculated pulling force on the display screen.
[0034] In this embodiment, the function relationship curve between the applied pulling force and the height of the elastic ring structure is calculated through the equilibrium equation of the static configuration of the elastic ring structure.
[0035] As Figure 4 shown, the elastic ring structure deforms into a shape similar to an ellipse under the action of a vertical pulling force. At this time, a coordinate system is established, and the lower end point of the elastic ring structure is set as the origin s0 (s = 0) of the natural coordinate. The elastic ring structure is symmetric about the y-axis, and the total length is The following differential equations are established:
[0036] x'(s) = cosθ(s), y′(s) = sinθ(s)
[0037] Kθ″(s) - T x sinθ(s) + T y cosθ(s) = 0
[0038] where K is the bending stiffness of the elastic ring structure, s represents the natural coordinate arc length of the elastic ring structure (the starting point of the natural coordinate is s0), x and y are the Cartesian coordinates of any point on the elastic ring structure, T x and T y are the internal forces in the x direction and y direction of the elastic ring structure, T x is a constant, T y = F / 4, and F is the pulling force applied to the hook.
[0039] Combined with the continuity conditions of the above differential equations: (θ, θ', x, y) is continuous along the elastic ring structure, and the boundary conditions: θ(0) = 0, y(0) = 0, x(0) = 0, the equilibrium configuration of the elastic ring structure under different pulling forces can be solved.
[0040] According to the equilibrium equation of the static configuration of the elastic ring structure, the height of the elastic ring structure is related to the pulling force applied to the hook and the bending stiffness of the elastic ring structure; by obtaining the function relationship between the pulling force applied to the hook and the height of the elastic ring structure, the pulling force applied to the hook can be indirectly measured by measuring the height of the elastic ring structure.
[0041] In this embodiment, the side length of the square cover plate is 0.06 m. The radii of the four elastic ring frames are 0.026 m, the thickness is 0.000381 m, the width is 0.008 m, the length is 0.163 m, the elastic modulus is 3.91e+10, and the flexural rigidity is 0.0014.
[0042] While keeping the flexural rigidity of a single elastic ring structure unchanged, the applied tensile force is continuously changed, and the function relationship curve between the height of a single elastic ring structure and the applied tensile force is fitted, as Figure 5 shown. It can be found from the fitted function relationship curve that the height of a single elastic ring structure is linearly related to the applied tensile force. Further transformation can obtain the function relationship curve between the height of the elastic ring structure and the applied tensile force, as Figure 6 shown. The function relationship between the height of the elastic ring structure and the applied tensile force is:
[0043] y = kx + b
[0044] where y is the height of the elastic ring structure, k is determined by the flexural rigidity of the elastic ring structure, and different flexural rigidities correspond to different k values, x is the tensile force applied to the hook, and b is the initial height of the elastic ring structure when no tensile force is applied.
[0045] In this embodiment, the function relationship between the height of the elastic ring structure and the applied tensile force is:
[0046] y = 0.0225x + 5.1257
[0047] where k = 0.0225 and b = 5.1257, that is, the initial height of the elastic ring structure when no tensile force is applied is 5.1257 cm.
[0048] By changing the flexural rigidity of the elastic ring structure to change the k value, thereby changing the function relationship between the height of the elastic ring structure and the applied tensile force, and further realizing the adjustment of the measurement range of the tensile force measuring device. When the applied tensile force is large, we can select an elastic ring structure with a large flexural rigidity to achieve more accurate measurement.
[0049] From the above analysis, it can be seen that the tensile force measuring device provided by the present invention can accurately obtain the magnitude of the measured tensile force. When no tensile force is applied, the square cover plate 2 is in the initial state, and the ranging sensor 7 measures the initial height of the elastic ring structure. When measuring the tensile force, we only need to apply the measured tensile force to the hook 1 of the tensile force measuring device. Under the action of the tensile force, the heights of the four elastic ring structures 3, 4, 5, and 6 will change uniformly. At this time, the ranging sensor 7 measures the height of the elastic ring structure after the tensile force is applied and sends the changed height to the control device. The control device calculates the magnitude of the applied tensile force according to the functional relationship y = 0.0225x + 5.1257 between the applied tensile force and the height of the elastic ring structure and displays it on the display screen 8.
[0050] The above is only a preferred embodiment of the present invention and is not a limitation of the present invention in other forms. Any person skilled in the art may use the technical content disclosed above to make changes or modifications into equivalent embodiments with equivalent changes. However, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution content of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims
1. A tensile force measuring device based on an elastic ring structure, characterized in that, It includes a housing, four elastic ring structures, a cover plate, a hook, a ranging sensor and a control device. The four elastic ring structures are arranged equidistantly and side by side in the housing, and the bottoms of the four elastic ring structures are fixedly connected to the bottom surface of the housing. The elastic ring structure can change the height of its static configuration under the action of tension, and corresponds to different static configuration heights under different tension actions; the cover plate is fixedly connected to the tops of the four elastic ring structures and is embedded in the housing. The hook is fixedly connected to the upper part of the cover plate so that the four elastic ring structures are evenly stressed when subjected to tension, and thus their height changes are consistent; the ranging sensor is installed under the cover plate, and its detection direction is downward to measure the change in the height of the elastic ring structure. The ranging sensor is electrically connected to the control device on the housing to send the ranging data to the control device. The control device calculates the magnitude of the applied tension according to the function relationship curve between the applied tension and the height of the elastic ring structure.
2. The tensile force measuring device based on an elastic ring structure according to claim 1, wherein The function relationship curve between the applied tension and the height of the elastic ring structure is obtained by calculating the equilibrium equation of the static configuration of the elastic ring structure; The elastic ring structure deforms under the action of vertical tension. At this time, a coordinate system is established. The lower end point of the elastic ring structure is set as the origin s0 of the natural coordinate. The elastic ring structure is symmetric about the y-axis and the total length is The following differential equations are established: x'(s) = cosθ(s), y′(s) = sinθ(s) Kθ′′(s) - T x sinθ(s) + T y cosθ(s) = 0 Among them, K is the bending stiffness of the elastic ring structure, s represents the natural coordinate arc length of the elastic ring structure form, the starting point of the natural coordinate is s0, x and y are the Cartesian coordinates of any point on the elastic ring structure form, T x and T y are the internal forces in the x-direction and y-direction of the elastic ring structure form, T x is a constant, T y = F / 4, where F is the pulling force applied to the hook; The differential equation system is combined with the continuity condition: (θ, θ', x, y) is continuous along the elastic circular ring structure, and the boundary condition: That is, the equilibrium configuration of the elastic circular ring structure under different tensile forces is solved; According to the equilibrium equation of the static configuration of the elastic ring structure, the height of the elastic ring structure is related to the tension applied to the hook and the bending stiffness of the elastic ring structure; obtaining the function relationship between the tension applied to the hook and the height of the elastic ring structure, the tension applied to the hook can be indirectly measured by measuring the height of the elastic ring structure.
3. The tensile force measuring device based on an elastic ring structure according to claim 1, wherein, Under the condition of ensuring that the bending stiffness of a single elastic ring structure remains unchanged, the applied tension is continuously changed, and the function relationship curve between the height of a single elastic ring structure and the applied tension is fitted. The height of a single elastic ring structure is linearly related to the applied tension, so as to obtain the function relationship between the height of the elastic ring structure and the applied tension: y = kx + b Wherein, y is the height of the elastic ring structure, k is determined by the bending stiffness of the elastic ring structure, and different bending stiffnesses correspond to different k values. x is the tension applied to the hook, and b is the initial height of the elastic ring structure when no tension is applied.
4. The tensile force measuring device based on an elastic ring structure according to claim 3, characterized in that, By changing the bending stiffness of the elastic ring structure to change the k value, thereby changing the function relationship between the height of the elastic ring structure and the applied tension, and further realizing the adjustment of the measurement range of the tension measuring device.
5. The tensile force measuring device based on an elastic ring structure according to claim 1, wherein The cover plate is a square cover plate. The center of the square cover plate coincides with the symmetry center of the four elastic ring structures. The ranging sensor is installed at the center position of the square cover plate.
6. The tensile force measuring device based on an elastic ring structure according to claim 5, characterized in that, A groove is opened at the center of the lower part of the square cover plate. The ranging sensor is installed in the groove of the square cover plate by means of magnetic adsorption; a threaded hole is opened at the center of the upper part of the square cover plate. The hook is screwed into the threaded hole through the thread at one end.
7. The tensile force measuring device based on an elastic ring structure according to claim 1, wherein, The control device includes a display screen. The display screen is embedded on one side surface of the housing. The control device displays the calculated tension on the display screen.