Elastic structure and weighing sensor
By designing an elastic structure including an elastomer and a curved groove, and using the strain addition of four resistance strain gauges for measurement, the problem of low accuracy caused by the center of gravity offset by the existing weighing sensor is solved, and high accuracy is achieved weight measurement.
Patent Information
- Application Number
- CN202421367779.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-14
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-06-14
AI Technical Summary
During measurement, existing weighing sensors cause strain errors due to center of gravity offset, thereby reducing measurement accuracy.
An elastic structure is designed, including an elastomer, a first arc groove, a second arc groove and a strain beam, and the weight is measured by the strain addition of four resistance strain gauges to form a Wheatstone bridge to improve the measurement. Accuracy.
Through deformation compensation of the strain beam, strain errors caused by center of gravity can be effectively offset, the accuracy of measurement results is improved, and the size of the sensor is reduced.
Smart Images
Figure CN222505573U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of sensors, and in particular relates to an elastic structure and a weighing sensor. Background Art
[0002] In many fields such as industrial automation, logistics, medical treatment, aerospace, etc., accurate and fast measurement of the weight of objects is a vital link. Traditional mechanical weighing equipment has gradually failed to meet the needs of modern industrial and social development due to its shortcomings such as low precision and slow response speed. Therefore, with the continuous development of sensor technology and electronic technology, electronic weight sensors have emerged and gradually become the mainstream of modern weighing technology. As the core component of modern weighing technology, electronic weight sensors mainly use the deformation of elastic bodies when subjected to external forces, and convert this deformation into electrical signal output through resistance strain gauges or other sensitive elements, thereby realizing the measurement of the weight of objects. Because the center of gravity will be offset during weighing, errors will occur in the strain of the elastic body, resulting in low measurement accuracy of the weighing sensor. Utility Model Content
[0003] Therefore, the utility model aims to solve the problem of low measurement accuracy of weighing sensors in the prior art.
[0004] To this end, the technical solution adopted is that an elastic structure of the utility model includes: an elastic body, on which a first arc groove and a second arc groove are opened and arranged opposite to each other, two strain beams are formed between the first arc groove and the second arc groove, and the second arc groove encloses a stress-bearing area.
[0005] Preferably, the elastic body is a rectangular plate, and four mounting holes are symmetrically arranged on the elastic body.
[0006] Preferably, a threaded hole is provided on the force bearing area.
[0007] Preferably, the first arc-shaped groove and the second arc-shaped groove are both U-shaped.
[0008] Preferably, the corners of the first arc-shaped groove and the second arc-shaped groove are rounded.
[0009] A weighing sensor adopts the elastic structure, two resistance strain gauges are arranged on the strain beam at intervals, and four resistance strain gauges are connected to form a Wheatstone bridge.
[0010] The technical solution of the utility model has the following advantages: since the weight is measured by adding the strain of four resistance strain gauges, the displacement of the weight's center of gravity will not affect the measurement result, and the measurement accuracy is high. The elastic body can be set in a thin plate shape, reducing the size of the sensor.
[0011] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures particularly pointed out in the written description and the drawings.
[0012] The technical solution of the utility model is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:
[0014] Figure 1 It is a structural schematic diagram of the utility model;
[0015] Figure 2 It is a schematic diagram of the measuring circuit of the utility model;
[0016] Among them, 1. elastic body; 2. first arc groove; 3. second arc groove; 4. strain beam; 5. stress-bearing area; 6. mounting hole; 7. threaded hole; 8. resistance strain gauge. DETAILED DESCRIPTION
[0017] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.
[0018] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When a component is referred to as being "connected to" another component, it can be directly or indirectly connected to the other component.
[0019] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0020] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0021] The utility model provides an elastic structure, such as Figure 1-2 As shown, it includes: an elastic body 1, on which a first arc groove 2 and a second arc groove 3 are arranged with openings opposite to each other, two strain beams 4 are formed between the first arc groove 2 and the second arc groove 3, and the second arc groove 3 forms a stress-bearing area 5.
[0022] The beneficial technical effect of the above technical solution is as follows: when the force-bearing area 5 bears a heavy object, deformation will occur in the two strain beams 4. Even if the center of gravity shifts, the deformation of one strain beam 4 is large and the deformation of the other strain beam 4 is small. The sum of the deformation amounts of the two remains unchanged. By compensating for the deformation, the accuracy of the measurement result is improved.
[0023] In one embodiment, the elastic body 1 is a rectangular plate, and four mounting holes 6 are symmetrically arranged on the elastic body 1, and bolts are installed on the mounting holes 11 to facilitate the fixing of the elastic body. A threaded hole 7 is arranged on the force-bearing area 5 to facilitate the installation of the load-bearing tray. The first arc groove 2 and the second arc groove 3 are both U-shaped, which is convenient for processing. The corners of the first arc groove 2 and the second arc groove 3 are rounded to reduce friction and resistance during assembly, making the assembly process smoother.
[0024] A weighing sensor adopts the elastic structure as described above. Figure 1-2 As shown, it includes: a resistance strain gauge 8, two resistance strain gauges 8 are arranged at intervals on the strain beam 4 of the elastic body 1, and four resistance strain gauges 8 are connected to form a Wheatstone bridge. A compensation resistor is installed on the signal output line of the Wheatstone bridge to perform temperature compensation, improve the accuracy and stability of the measurement data, and make the measurement result more reliable.
[0025] The beneficial technical effect of the above technical solution is that the strain generated by the two strain beams 4 causes the resistance values of the four resistance strain gauges 8 to change, which are converted into electrical signals and transmitted to the processor to obtain the weight of the object through calculation. Since the weight is measured by adding the strains of the four resistance strain gauges, the deviation of the center of gravity of the weight will not affect the measurement result, and the measurement accuracy is high.
[0026] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.
Claims
1. An elastic structure, characterized in that: include: An elastic body (1) is provided with a first arc-shaped groove (2) and a second arc-shaped groove (3) which are arranged opposite to each other with an opening, two strain beams (4) are formed between the first arc-shaped groove (2) and the second arc-shaped groove (3), and the second arc-shaped groove (3) encloses a force-bearing area (5).
2. An elastic structure according to claim 1, characterized in that: The elastic body (1) is a rectangular plate, and four mounting holes (6) are symmetrically arranged on the elastic body (1).
3. An elastic structure according to claim 1, characterized in that: A threaded hole (7) is provided on the force bearing area (5).
4. The elastic structure according to claim 1, characterized in that: The first arc-shaped groove (2) and the second arc-shaped groove (3) are both U-shaped.
5. The elastic structure according to claim 1, characterized in that: The corners of the first arc-shaped groove (2) and the second arc-shaped groove (3) are rounded.
6. A weighing sensor, using an elastic structure according to any one of claims 1 to 5, characterized in that: include: A resistance strain gauge (8), two resistance strain gauges (8) are arranged at intervals on the strain beam (4) of the elastic body (1), and four resistance strain gauges (8) are connected to form a Wheatstone bridge.