Weighing sensor device

Abstract

This invention provides a weighing sensor device, including a force loading component, an elastic body beam fixed to the force loading component, an elastic body sub-beam, and a mounting body for mounting the elastic body sub-beam. The elastic body sub-beam is equipped with a plurality of strain gauges. In the vertical direction, the elastic body sub-beam is located below the end of the elastic body beam. When the external load does not reach the window load range, the elastic body beam and the elastic body sub-beam are not in contact. The load weight is calculated from the data output generated by the elastic body beam. As the external load continuously increases, the gap between the elastic body beam and the elastic body sub-beam continuously decreases until the external load reaches the window load. At this point, the elastic body beam and the elastic body sub-beam begin to contact, and the resistance of the strain gauges changes. The load magnitude within the window range is accurately calculated using the output data from the elastic body sub-beam. This weighing sensor device is economical, efficient, and enables high-precision measurement of heavy objects.

Description

[Technical Field]

[0001] This invention relates to the field of weighing technology, and in particular to a weighing sensor device. [Background Technology]

[0002] A load cell is a type of sensor that converts the weight information of the object being measured into an electrical signal, thereby obtaining the weight of the object. It is widely used in the field of weighing instruments.

[0003] The most commonly used load cells are strain gauge type, which utilizes strain gauges combined with a metallic elastomer. By creating stress concentration areas on the elastomer and placing strain gauges in these areas, a Wheatstone bridge circuit is formed by connecting metal wires. When a load is applied to the elastomer, the area where the strain gauges are attached will stretch or compress, causing a change in the resistance of the strain gauges. This converts the strain signal into a voltage signal, thereby obtaining the weight information of the measured object. It has advantages such as compact structure, simple principle, and low price.

[0004] However, current load cells are limited by the elastomer materials and processing technology, as well as the inherent property of strain gauges being affected by temperature changes. Existing strain gauge sensors can typically only achieve a comprehensive error of 0.05%, making it difficult to meet the requirements of high-precision measurement. At the same time, there is a trade-off between the range and sensitivity of load cells. For high-sensitivity load cells, the range is usually small, which greatly limits the high-precision measurement of heavy objects. [Summary of the Invention]

[0005] The purpose of this invention is to provide a weighing sensor device that is economical, efficient, and enables high-precision measurement of heavy objects.

[0006] To achieve the above-mentioned objective, this invention provides a weighing sensor device, comprising a force loading member and an elastic beam whose end is fixed to the force loading member. The weighing sensor device further includes an elastic small beam and a mounting body for mounting the elastic small beam. The elastic small beam is provided with a plurality of strain gauges, and in the vertical direction, the elastic small beam is located below the end of the elastic beam. When the external load does not reach the window range, the elastic beam and the elastic small beam are not in contact, and the load weight is calculated from the data output generated by the elastic beam. As the external load continuously increases, the gap between the elastic beam and the elastic small beam continuously decreases until the external load reaches the window load. At this point, the elastic beam and the elastic small beam begin to contact, the elastic small beam deforms under pressure, and the resistance of the strain gauges changes. The output data on the elastic small beam is used to accurately calculate the load magnitude within the window range.

[0007] As a further improvement of one embodiment of the present invention, when the elastic body beam and the elastic body spur beam come into contact, the elastic body beam and the elastic body spur beam are always in line contact.

[0008] As a further improvement of one embodiment of the present invention, the force loading member includes a base portion and an inverted U-shaped frame fixed to the base portion. The end of the elastic body beam is located in the hollow portion of the inverted U-shaped frame and is fixed to the inverted U-shaped frame. One end of the elastic body beam is also located in the hollow portion of the inverted U-shaped frame.

[0009] As a further improvement of one embodiment of the present invention, the strain gauge is a semiconductor strain gauge.

[0010] As a further improvement of one embodiment of the present invention, two strain gauges are provided on the upper side of the elastic body beam, and two strain gauges are also provided on the lower side of the elastic body beam opposite to the upper side.

[0011] As a further improvement of one embodiment of the present invention, the elastic beam further includes a front side portion and a rear side portion opposite to the front side portion, and the front side portion and the rear side portion are both connected to the upper side portion and the lower side portion. The elastic beam is provided with a through hole extending from the front side portion to the rear side portion, and the length of the through hole in the lateral direction is greater than its length in the vertical direction.

[0012] As a further improvement of one embodiment of the present invention, when the weighing sensor device is in an unloaded state, the gap between the elastic body beam and the elastic body spur beam can be adjusted in the vertical direction.

[0013] As a further improvement of one embodiment of the present invention, the mounting body is provided with a spiral fine-tuning device, which can be used to adjust the gap between the elastic body beam and the elastic body spur beam in the vertical direction.

[0014] As a further improvement of one embodiment of the present invention, the weighing sensor device further includes an adapter plate, the elastic beam is fixedly installed on the adapter plate, and the adapter plate is fixed to the mounting body.

[0015] As a further improvement of one embodiment of the present invention, the adapter plate includes a first fixing part and a second fixing part perpendicular to the first fixing part, the elastic beam is fixedly connected to the first fixing part, and the mounting body is fixedly connected to the second fixing part.

[0016] Compared with existing technologies, this invention has the following advantages: it employs a combination of an elastic body beam and a highly sensitive elastic body beam. External loads act directly on the elastic body beam. Only under a specific load reaching a window load will the elastic body beam contact the elastic body beam. The external load is indirectly transmitted to the elastic body beam through the elastic body beam, allowing the elastic body beam to begin deforming and generating output within a specific load range. This reduces the full-scale load to a specific window range, and then utilizes the highly sensitive elastic body beam to achieve high-precision measurement. Compared with traditional single elastic strain gauge load cells, the segmented weighing structure using a combination of elastic body beams and beams provides accurate and high-precision results. Therefore, this weighing sensor device is an economical, efficient, and high-quality detection solution. The technical solution provided by this invention achieves range shifting, enabling high-precision measurements greater than one ten-thousandth using strain gauge sensors, while also achieving high-precision measurements of heavy objects. [Attached Image Description]

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0018] Figure 1 This is a schematic diagram of a Wheatstone bridge circuit powered by a constant voltage source.

[0019] Figure 2 This is a three-dimensional schematic diagram of the weighing sensor device provided in a specific embodiment of this application.

[0020] Figure 3 yes Figure 2 A three-dimensional schematic diagram of the elastic beam in the weighing sensor device.

Detailed Implementation Methods

[0021] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0022] The terms “comprising” and “having”, and any variations thereof, used in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0023] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0026] Please see Figures 1 to 3 As shown in the specific embodiment of the present invention, this embodiment provides a weighing sensor device, which includes a force loading member 4 and an elastic body beam 5 whose end is fixed to the force loading member 4. The weighing sensor device also includes an elastic body small beam 2 and a mounting body 1 for mounting the elastic body small beam 2. The elastic body small beam 2 is provided with a plurality of strain gauges 7, and in the vertical direction, the elastic body small beam 2 is located below the end of the elastic body beam 5. When the external load does not reach the window range, the elastic body beam 5 and the elastic body small beam 2 are not in contact. The load weight is calculated by the data output generated by the elastic body beam 5. As the external load increases, the gap between the elastic body beam 5 and the elastic body small beam 2 continuously decreases until the external load reaches the window load. At this point, the elastic body beam 5 and the elastic body small beam 2 begin to contact, the elastic body small beam 2 is compressed and deformed, and the resistance of the strain gauges 7 changes. The load size of the window range is accurately calculated using the output data on the elastic body small beam 2.

[0027] In this preferred embodiment, a combination of an elastic body beam 5 and a highly sensitive elastic body beam 2 is employed. External loads act directly on the elastic body beam 5. Only when a specific load reaches the window load does the elastic body beam 5 come into contact with the elastic body beam 2. The external load is indirectly transmitted to the elastic body beam 2 through the elastic body beam 5, allowing the elastic body beam 2 to begin deforming and generating output within a specific load range. This reduces the full-scale load to a specific window range, and the highly sensitive elastic body beam 2 then enables high-precision measurement. Compared to traditional single elastic strain gauge load cells, the segmented weighing structure using a combination of elastic body beams and beams provides accurate and high-precision results. Therefore, this weighing sensor device is an economical, efficient, and high-quality detection solution. The technical solution provided by this invention achieves range shifting, enabling high-precision measurements greater than one ten-thousandth using strain gauge sensors, while also achieving high-precision measurements of heavy objects.

[0028] Furthermore, when the elastic beam 5 and the elastic beam 2 come into contact, the contact between them is always linear. In this embodiment, since the contact between the elastic beam 5 and the elastic beam 2 is always linear, errors in the force transmission process can be minimized, while also avoiding the influence of lateral forces on the output of the weighing sensor device.

[0029] Specifically, the contact surface between the main elastic beam 5 and the secondary elastic beam 2 is a plane, while the contact surface between the secondary elastic beam 2 and the main elastic beam 5 is a cylindrical surface 10. A semi-cylinder is provided at the end of the secondary elastic beam 2 that contacts the main elastic beam 5. This design ensures that when the load shifts, the relative position of the main elastic beam 5 and the secondary elastic beam 2 changes. At this time, the contact method between the cylindrical surface 10 and the plane ensures that the main elastic beam 5 and the secondary elastic beam 2 always maintain line contact, reducing the error caused by off-center loading.

[0030] The elastic beam is provided with a through hole 11. Specifically, the through hole 11 consists of two large circular holes and a short straight hole connecting the two large circular holes.

[0031] The force loading component 4 includes a base portion 12 and an inverted U-shaped frame 14 fixed to the base portion 12. The end of the elastic body beam 5 is located in the hollow part of the inverted U-shaped frame 14 and is fixed to the inverted U-shaped frame 14. One end of the elastic body beam 2 is also located in the hollow part of the inverted U-shaped frame 14. This arrangement makes the overall structure of the weighing sensor device simple and compact.

[0032] In this embodiment, the elastic beam 5 and the force loading member 4 are fixed together by two bolts. Of course, other fixing methods can also be used between the elastic beam 5 and the force loading member 4. Specifically, the elastic beam 5 and the inverted U-shaped frame 14 are fixed together by two bolts, and the elastic beam 5 is adjacent to the upper bottom of the inverted U-shaped frame 14 opposite to the base part 12.

[0033] Specifically, strain gauge 7 is a semiconductor strain gauge 7. Semiconductor strain gauge 7 has a sensitivity coefficient that is much higher than that of metal strain gauge 7, which can greatly increase the original signal output of the weighing sensor device, improve the resolution, and at the same time reduce the influence of environmental noise and other factors on the signal output of the weighing sensor device.

[0034] Furthermore, four strain gauges 7 are attached to the outside of the elastic beam 2.

[0035] Two strain gauges 7 are provided on the upper side 18 of the elastic beam 2, and two strain gauges 7 are also provided on the lower side of the elastic beam 2 opposite to the upper side 18. Specifically, two semiconductor strain gauges 7 are provided on the upper side 18 of the elastic beam 2, and two semiconductor strain gauges 7 are also provided on the lower side of the elastic beam 2 opposite to the upper side 18.

[0036] Semiconductor strain gauges 7 are connected by metal leads 8 to form a structure as shown in the figure. Figure 1 The Wheatstone bridge circuit shown in the diagram uses semiconductor strain gauges R1, R2, R3, and R4. Metal leads 8 are connected to terminals 6 on both sides of the elastic beam 2, establishing an electrical connection between the elastic beam 2 and external equipment. When an external object reaches a certain weight, the end plane of the elastic beam 5 contacts the cylindrical surface 10 of the elastic beam 2. When the cylindrical surface 10 is compressed, the elastic beam 2 undergoes displacement deformation, changing the resistance of the semiconductor strain gauges 7. This causes the bridge to lose balance and output an electrical signal, from which the weight of the measured object can be determined.

[0037] The elastic beam 2 also includes a front portion 16 and a rear portion opposite to the front portion 16, and both the front portion 16 and the rear portion are connected to the upper portion 18 and the lower portion. The elastic beam 2 has a through hole extending from the front portion 16 to the rear portion, and the length of the through hole in the transverse direction is greater than its length in the vertical direction. This configuration can effectively increase the maximum strain at the through hole of the elastic beam 2, thereby further improving the output of the elastic beam 2.

[0038] Specifically, the through hole includes a first circular hole 20, a second circular hole 9, and a rectangular hole 22 connecting the first circular hole 20 and the second circular hole 9. The first circular hole 20, the rectangular hole 22, and the second circular hole 9 are arranged along the longitudinal extension direction of the elastic beam 2. Preferably, the diameters of the first circular hole 20 and the second circular hole 9 are equal, the diameters of the first circular hole 20 and the second circular hole 9 are greater than the width of the rectangular hole 22, and the diameters of the first circular hole 20 and the second circular hole 9 are less than the length of the rectangular hole 22.

[0039] Furthermore, when the load cell device is in an unloaded state, the gap between the main elastic beam 5 and the secondary elastic beam 2 in the vertical direction can be adjusted. With this configuration, the accuracy of the load cell device can be adjusted by regulating the gap between the main elastic beam 5 and the secondary elastic beam 2 after prolonged use.

[0040] Specifically, the mounting body 1 includes a screw fine-tuning device 24, which can adjust the vertical gap between the elastic body beam 5 and the elastic body beam 2. In this preferred embodiment, the mounting body 1 and the screw fine-tuning device 24 are a single unit.

[0041] The weighing sensor device also includes an adapter plate 3, an elastic beam 2 fixedly mounted on the adapter plate 3, and the adapter plate 3 fixedly mounted on the mounting body 1.

[0042] The adapter plate 3 includes a first fixing part and a second fixing part perpendicular to the first fixing part. The elastic beam 2 is fixedly connected to the first fixing part, and the mounting body 1 is fixedly connected to the second fixing part. In other words, the adapter plate 3 is configured as an L-shaped plate.

[0043] Specifically, the elastic beam 2 is fixed to the first fixing part of the adapter plate 3 by two bolts, and the second fixing part is fixed to the mounting body 1 by two other bolts.

[0044] The above is only one specific embodiment of the present invention, and any improvements made based on the concept of the present invention shall be considered within the scope of protection of the present invention.

Claims

1. A load cell device comprising a force loading member, an elastomeric girder having its ends fixed to the force loading member, characterised in that, The weighing sensor device further includes an elastic body beam and a mounting body for mounting the elastic body beam. The elastic body beam is equipped with several strain gauges, and in the vertical direction, the elastic body beam is located below the end of the elastic body main beam. When the external load does not reach the window range, the elastic body main beam and the elastic body beam are not in contact. The load weight is calculated from the data output generated by the elastic body main beam. As the external load increases, the gap between the elastic body main beam and the elastic body beam continuously decreases until the external load reaches the window load. At this point, the elastic body main beam and the elastic body beam begin to contact, the elastic body beam deforms under pressure, and the resistance of the strain gauges changes. The output data on the elastic body beam is used to accurately calculate the load magnitude within the window range. When the weighing sensor device is in an unloaded state, the gap between the elastic body main beam and the elastic body beam can be adjusted in the vertical direction.

2. Weighing sensor arrangement according to claim 1, characterized in that When the main elastic beam comes into contact with the secondary elastic beam, the contact between the main elastic beam and the secondary elastic beam is always linear.

3. The load cell apparatus of claim 1, wherein, The force loading member includes a base portion and an inverted U-shaped frame fixed to the base portion. The end of the elastic body beam is located in the hollow portion of the inverted U-shaped frame and is fixed to the inverted U-shaped frame. One end of the elastic body small beam is also located in the hollow portion of the inverted U-shaped frame.

4. The load cell apparatus of claim 1, wherein, The strain gauge is a semiconductor strain gauge.

5. The load cell apparatus of claim 1, wherein, Two strain gauges are provided on the upper side of the elastic body beam, and two strain gauges are also provided on the lower side of the elastic body beam opposite to the upper side.

6. The load cell apparatus of claim 1, wherein, The elastic beam further includes a front side portion and a rear side portion opposite to the front side portion, and the front side portion and the rear side portion are both connected to the upper side portion and the lower side portion. The elastic beam has a through hole extending from the front side portion to the rear side portion, and the length of the through hole in the transverse direction is greater than its length in the vertical direction.

7. The load cell apparatus of claim 1, wherein, The mounting body is equipped with a screw fine-tuning device, which can be used to adjust the vertical gap between the elastic body beam and the elastic body spur beam.

8. The load cell apparatus of claim 1, wherein, The weighing sensor device also includes an adapter plate, the elastic beam is fixedly installed on the adapter plate, and the adapter plate is fixed to the mounting body.

9. The load cell apparatus of claim 8, wherein, The adapter plate includes a first fixing part and a second fixing part perpendicular to the first fixing part. The elastic beam is fixedly connected to the first fixing part, and the mounting body is fixedly connected to the second fixing part.

Images