A weighing device based on height change of elastic ring frame

Abstract

The application relates to a weight measuring device based on height change of elastic circular ring frames, which comprises a shell, four elastic circular ring frames, a tray, a distance sensor and a main control assembly. The four elastic circular ring frames are arranged on the bottom surface in the shell according to the four corners of a square, and the height of the static configuration of the elastic circular ring frames can be changed under the action of the gravity of a measured object. The tray is fixedly connected to the top of the four elastic circular ring frames, so that the four elastic circular ring frames are uniformly stressed when bearing the measured weight, and the height change of the four elastic circular ring frames is consistent. The distance sensor is installed at the lower part of the tray and faces downward, so as to measure the height change of the elastic circular ring frames. The distance sensor is electrically connected to the main control assembly on the shell, so as to send the measurement data to the main control assembly. According to the function relation curve between the weight of the weight and the height of the elastic circular ring frame, the weight of the measured weight is calculated. The device has simple structure, is easy to use, and has high accuracy and reliability in weight measurement.

Description

Technical Field

[0001] The invention belongs to the technical field of weight measurement, and in particular relates to a weight measuring device based on height change of an elastic ring frame. Background Art

[0002] With the development of society and the improvement of people's daily living standards, people's demand for weighing devices is also increasing. At present, the scenarios involved in weighing devices are mostly daily weight management, food production, traditional Chinese medicine combination, laboratories and chemical industries. Current conventional weighing devices include beam scales with wooden or metal rods with star points and tapers as the main body and equipped with weights, spring scales that use spring compression and tension deformation to achieve measurement, pan balances, electronic scales, etc. However, these weighing devices have high manufacturing process requirements, and are large in size, high in cost, slow in response speed, prone to sideways tilting during weighing, inconvenient to carry, seriously out of tolerance in measurement accuracy, low in product strength, short in life, and restricted in application areas. In addition, the fatigue problem of traditional spring scales cannot be completely solved. Once the elastic limit is exceeded, large errors or even damage will occur, affecting the accuracy and reliability of weighing. Summary of the Invention

[0003] The object of the present invention is to provide a weight measuring device based on the height change of an elastic ring frame, which has a simple structure, is easy to use, and has high accuracy and reliability in weight measurement.

[0004] To achieve the above-mentioned object, the technical solution adopted by the present invention is as follows: a weighing device based on the height change of an elastic ring frame, comprising a housing, four elastic ring frames, a tray, a distance sensor and a main control component, wherein the four elastic ring frames are arranged on the bottom surface of the housing at the four corners of a square, and the elastic ring frames can change the height of their static configuration under the action of the gravity of the object to be measured, and the static configuration heights correspond to different gravity of different objects to be measured; the tray is fixedly connected to the top of the four elastic ring frames so that the four elastic ring frames are uniformly stressed when carrying the measured weight, thereby making their height changes consistent; the distance sensor is installed at the bottom of the tray with its detection direction facing downward to measure the change in the height of the elastic ring frames; the distance sensor is electrically connected to the main control component on the housing to send measurement data to the main control component, and the main control component calculates the weight of the measured weight according to a functional relationship curve between the weight of the weight and the height of the elastic ring frames.

[0005] Furthermore, the functional relationship curve between the weight of the heavy object and the height of the elastic ring frame is calculated by using the equilibrium equation of the static configuration of the elastic ring frame;

[0006] The elastic ring frame deforms under the gravity of the object to be measured. At this time, a coordinate system is established, and the lower end point of the elastic ring frame is set as the origin s0 of the natural coordinate. The elastic ring frame is symmetrical about the y axis, and the total length is Establish the following differential equations:

[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 frame, s represents the natural coordinate arc length of the elastic ring frame, the natural coordinate starting point is s0, x and y are the Cartesian coordinates of any point on the elastic ring frame, T x and T y are the internal forces in the x-direction and y-direction of the elastic ring frame, T x is a constant, T y =G / 4, G is the total weight of the measured object and the pallet;

[0010] The differential equations are combined with the continuity condition: (θ, θ', x, y) is continuous along the elastic ring frame, and the boundary conditions: θ(0) = 0, y(0) = 0, x(0) = 0, That is, to solve the equilibrium configuration of the elastic ring frame under the gravity of different objects to be tested;

[0011] According to the equilibrium equation of the static configuration of the elastic ring frame, the height of the elastic ring frame is related to the weight of the measured weight and the bending stiffness of the elastic ring frame; by obtaining a functional relationship between the weight of the weight and the height of the elastic ring frame, the weight of the weight can be indirectly measured by measuring the height of the elastic ring frame.

[0012] Furthermore, while ensuring that the bending stiffness of a single elastic ring frame remains unchanged, the weight of the added weight is continuously changed to fit a curve showing the functional relationship between the height of the elastic ring frame and the gravity of the added weight. The height of a single elastic ring frame is linearly related to the weight of the added weight, thus obtaining the functional relationship between the height of the elastic ring frame and the weight of the measured weight:

[0013] y=kx+b

[0014] Where y is the height of the elastic ring frame, k is determined by the bending stiffness of the elastic ring frame. Different bending stiffnesses correspond to different k values. x is the weight of the measured object, and b is the initial height of the elastic ring frame when no weight is placed.

[0015] Furthermore, by changing the bending stiffness of the elastic ring frame to change the k value, the functional relationship between the height of the elastic ring frame and the measured weight is changed, thereby achieving adjustment of the measuring range of the weighing device.

[0016] Furthermore, a plurality of adjustable supporting feet are evenly arranged on the bottom of the shell.

[0017] Furthermore, the tray is a circular tray, the center of the circular tray coincides with the symmetry center of the four elastic circular ring frames, and the distance sensor is installed at the center of the circular tray.

[0018] Furthermore, the main control component includes a display screen, which is embedded in one side of the shell, and the main control component displays the calculated weight on the display screen.

[0019] Compared with the prior art, the present invention has the following advantages: It provides a weight measuring device based on the height variation of an elastic ring frame. This device utilizes the fact that the elastic ring frame changes its static configuration height under the influence of the gravity of the object to be measured, and measures the weight by measuring the height variation of the measuring frame. The device has a simple structure, is easy to use, and offers high measurement accuracy and reliability. The device is easy to install and calibrate, and the measurement range can be adjusted by varying the bending stiffness of the elastic ring frame. Furthermore, the device has a stable structural design, good rollover resistance, strong adaptability, high strength, and a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the composition structure of a weighing device according to an embodiment of the present invention.

[0021] Figure 2 Schematic diagram of the overall structure of the weighing device according to an embodiment of the present invention.

[0022] Figure 3 Schematic diagram of the connection structure between the tray and four elastic ring frames in an embodiment of the present invention.

[0023] Figure 4 This is a force analysis diagram of a single elastic ring frame after a heavy object is placed on it in an embodiment of the present invention.

[0024] Figure 5 Graph showing the linear relationship between the height of the elastic ring frame and the gravity of the object to be measured in the embodiment of the present invention.

[0025] Figure 6 Graph showing the functional relationship between the height of the elastic ring frame and the mass of the measured weight in an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] It should be noted that the following detailed descriptions are exemplary and are 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 skilled in the art to which the present application belongs.

[0028] It should be noted that the terms used herein are only for describing specific embodiments 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 "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0029] like Figure 1 、 2 As shown, this embodiment provides a weighing device based on the height change of an elastic ring frame, comprising a housing 7, four elastic ring frames (a first elastic ring frame 3, a second elastic ring frame 4, a third elastic ring frame 5, and a fourth elastic ring frame 6), a tray 2, a distance sensor 1, and a main control component. The four elastic ring frames 3, 4, 5, and 6 are arranged on the bottom surface of the housing 7 at the four corners of a square. The elastic ring frames can change the height of their static configuration under the action of the gravity of the object to be measured, and different static configuration heights correspond to different gravity actions of different objects to be measured; the tray 2 is fixedly connected to the top of the four elastic ring frames 3, 4, 5, and 6 (as shown in FIG. Figure 3 As shown), the four elastic ring frames are evenly stressed when carrying the measured weight, so that their shapes and heights change in a consistent manner; the distance sensor 1 is installed at the lower part of the tray 2, and its detection direction is downward to measure the change in the height of the elastic ring frames. The distance sensor 1 is electrically connected to the main control component on the shell 7 to send the measurement data to the main control component, and the main control component calculates the weight of the measured weight according to the functional relationship curve between the weight of the weight and the height of the elastic ring frames.

[0030] In this embodiment, the tray 2 is a circular tray, the center of which coincides with the symmetrical centers of the four elastic ring frames 3, 4, 5, and 6. The distance sensor 1 is mounted at the center of the circular tray. Four adjustable support feet 9 are evenly arranged at the bottom of the housing 7 to adjust the level of the device.

[0031] In this embodiment, the main control component includes a display screen 8, which is embedded in a side surface of the housing 7. The main control component displays the calculated weight on the display screen.

[0032] In this embodiment, the functional relationship curve between the weight of the heavy object and the height of the elastic circular ring frame is calculated by using the equilibrium equation of the static configuration of the elastic circular ring frame.

[0033] like Figure 4 As shown, the elastic ring frame undergoes an elliptical deformation under the gravity of the object to be measured. At this time, a coordinate system is established, and the lower end point of the elastic ring frame is set as the origin s0 (s=0) of the natural coordinate. The elastic ring frame is symmetrical about the y axis, and the total length is Establish the following differential equations:

[0034] x'(s)=cosθ(s), y'(s)=sinθ(s)

[0035] Kθ′'(s)-T x sinθ(s)+T y cosθ(s)=0

[0036] Where K is the bending stiffness of the elastic ring frame, s represents the natural coordinate arc length of the elastic ring frame (the natural coordinate starting point is s0), x and y are the Cartesian coordinates of any point on the elastic ring frame, T x and T y are the internal forces in the x-direction and y-direction of the elastic ring frame, T x is a constant, T y =G / 4, G is the total weight of the measured object and the pallet.

[0037] The above differential equations are combined with the continuity condition: (θ, θ', x, y) is continuous along the elastic ring frame, and the boundary conditions: θ(0) = 0, y(0) = 0, x(0) = 0, The equilibrium configuration of the elastic ring frame under the gravity of different objects to be tested can be solved.

[0038] According to the equilibrium equation of the static configuration of the elastic ring frame, the height of the elastic ring frame is related to the weight of the measured weight and the bending stiffness of the elastic ring frame; by obtaining a functional relationship between the weight of the weight and the height of the elastic ring frame, the weight of the weight can be indirectly measured by measuring the height of the elastic ring frame.

[0039] In this embodiment, the radius of the circular tray is 0.23 m, the radius of the four elastic ring frames is 0.080215 m, the thickness is 0.000381 m, the width is 0.05 m, the length is 0.504 m, the elastic modulus is 3.9100e+11, and the bending stiffness is 9.0103e-04.

[0040] Under the condition that the bending stiffness of a single elastic ring frame remains unchanged, the weight of the added weight is continuously changed, so as to fit the functional relationship curve between the height of the elastic ring frame and the gravity of the added weight, as shown in the figure: Figure 5 Further transformation can obtain the functional relationship curve between the height of the elastic ring frame and the weight of the measured weight, as shown in Figure 6 As shown. From the fitted functional relationship curve, it can be found that the height of a single elastic ring frame is linearly related to the weight of the added weight, and the functional relationship between the height of the elastic ring frame and the weight of the measured weight is:

[0041] y=kx+b

[0042] Where y is the height of the elastic ring frame, k is determined by the bending stiffness of the elastic ring frame. Different bending stiffnesses correspond to different k values. x is the weight of the measured object, and b is the initial height of the elastic ring frame when no weight is placed.

[0043] In this embodiment, the functional relationship between the height of the elastic ring frame and the weight of the measured object is:

[0044] y=-0.2595x+16.1364

[0045] Among them, k = -0.2595, b = 16.1364.

[0046] By changing the bending stiffness of the elastic ring frame to change the k value, the functional relationship between the height of the elastic ring frame and the measured weight is changed, thereby achieving adjustment of the measuring range of the weighing device.

[0047] From the above analysis, it can be seen that the weighing device provided by the present invention can accurately determine the weight of the weight to be measured. When no weight is placed, the circular tray is in an initial state, and the distance sensor 1 measures the initial height of the elastic ring frame. When a weight is to be measured, we only need to place the weight to be measured on the circular tray 2 of the measuring device. Under the action of the weight, the heights of the four elastic ring frames 3, 4, 5, and 6 will change in a consistent manner. At this time, the distance sensor 1 measures the height of the elastic ring frame after the weight is placed, and sends the changed height to the main control component 8. The main control component 8 calculates the weight of the measured weight based on the functional relationship y = -0.2595x + 16.1364 between the weight of the weight and the height of the elastic ring frame, and displays it on the display screen 8.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other manner. Any person skilled in the art may utilize the above-disclosed technical content to modify or modify the present invention into equivalent embodiments. However, any simple modifications, equivalent variations, and modifications to the above embodiments that do not depart from the technical content of the present invention and are based on the technical essence of the present invention remain within the scope of protection of the present invention.

Claims

1. A weighing device based on the height change of an elastic ring frame, characterized in that: It includes a shell, four elastic ring frames, a tray, a distance sensor and a main control component. The four elastic ring frames are arranged on the bottom surface of the shell at the four corners of a square. The elastic ring frames can change the height of their static configuration under the action of the gravity of the object to be measured, and the static configuration heights correspond to different gravity of different objects to be measured; the tray is fixedly connected to the top of the four elastic ring frames so that the four elastic ring frames are evenly stressed when carrying the measured weight, thereby making their height changes consistent; the distance sensor is installed at the bottom of the tray, and its detection direction is downward to measure the change in the height of the elastic ring frames. The distance sensor is electrically connected to the main control component on the shell to send the measurement data to the main control component. The main control component calculates the weight of the measured weight according to the functional relationship curve between the weight of the weight and the height of the elastic ring frames.

2. A weighing device based on height variation of an elastic ring frame according to claim 1, characterized in that: While ensuring that the bending stiffness of a single elastic ring frame remains unchanged, the weight of the added weight is continuously changed to fit a curve showing the functional relationship between the height of the elastic ring frame and the gravity of the added weight. The height of a single elastic ring frame is linearly related to the weight of the added weight, thus obtaining the functional relationship between the height of the elastic ring frame and the weight of the measured weight: Where y is the height of the elastic ring frame, k is determined by the bending stiffness of the elastic ring frame. Different bending stiffnesses correspond to different k values. x is the weight of the measured object, and b is the initial height of the elastic ring frame when no weight is placed.

3. A weighing device based on height variation of an elastic ring frame according to claim 2, characterized in that: By changing the bending stiffness of the elastic ring frame to change the k value, the functional relationship between the height of the elastic ring frame and the measured weight is changed, thereby achieving adjustment of the measuring range of the weighing device.

4. The weighing device based on the height change of the elastic ring frame according to claim 1, characterized in that: A plurality of adjustable supporting feet are evenly arranged on the bottom of the shell.

5. The weighing device based on the height change of the elastic ring frame according to claim 1, characterized in that: The tray is a circular tray, the center of the circular tray coincides with the symmetry centers of the four elastic circular ring frames, and the distance sensor is installed at the center of the circular tray.

6. The weighing device based on the height change of the elastic ring frame according to claim 1, characterized in that: The main control component includes a display screen, which is embedded on one side of the shell. The main control component displays the calculated weight on the display screen.

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