Flat shelf load cell

Abstract

The utility model discloses a kind of flat shelf weighing sensor, including scale table, elastomer, eight strain gauges, flexible PCB, cable, the upper surface of elastomer is equipped with first strain groove, second strain groove, third strain groove and fourth strain groove, first strain groove and third strain groove, fourth strain groove between respectively being equipped with first strain area, fourth strain area, second strain groove and third strain groove, fourth strain groove between respectively being equipped with second strain area, third strain area, first strain area, second strain area, third strain area, fourth strain area respectively being equipped with 2 strain gauges.The utility model one strain area has positive strain and negative strain, the design of strain groove makes the positive and negative strain of strain area equal, four strain areas can realize the compensation of four-corner error, to improve product precision, size flat, satisfy small space shelf use, and need not to carry out four-corner error compensation, in the arbitrary position of sensor scale table meets weighing precision.

Description

Technical Field

[0001] This utility model belongs to the field of sensor technology, specifically relating to a flat shelf weighing sensor. Background Technology

[0002] With the development of artificial intelligence, weighing sensors provide data for intelligent decision-making, predictive maintenance, and big data analysis. Therefore, electronic scales made from weighing sensors are used in almost every industry. Among these, shelf weighing is a key step towards digital and intelligent warehouse management. By giving static shelves "sensing" capabilities, it completely changes the traditional inventory management model, bringing significant improvements in safety, efficiency, and cost-effectiveness to enterprises. This article introduces a new type of flat shelf weighing sensor that can achieve real-time inventory management, safety warnings, process traceability, and improved operational efficiency and accuracy.

[0003] The simplest weighing test system uses a single-point sensor, typically consisting of one sensor and a weighing platform. The object to be measured rests on the platform. Because the object can be positioned arbitrarily on the platform, and the weighing accuracy must remain within the required range, the sensor must undergo four-corner error compensation. More complex weighing systems use multiple sensors, but the ratio of sensitivity to output resistance of each sensor still needs to be controlled to avoid four-corner errors.

[0004] Therefore, a flat shelf weighing sensor that does not require four-corner error compensation is urgently needed. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a flat shelf weighing sensor.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0007] This utility model provides a flat shelf weighing sensor, including a weighing platform, an elastic body, eight strain gauges, a flexible PCB, and a cable. The weighing platform is disposed on the upper surface of the elastic body, which has a flat cuboid structure. The upper surface of the elastic body is provided with a first strain groove, a second strain groove, a third strain groove, and a fourth strain groove. The first and second strain grooves are symmetrically located at both ends of the elastic body along its length, and the third and fourth strain grooves are symmetrically located on both sides of the elastic body along its length. A first strain zone and a fourth strain zone are respectively provided between the first strain groove and the third and fourth strain grooves. A second strain zone and a third strain zone are respectively provided between the second strain groove and the third and fourth strain grooves. Two strain gauges are disposed on each of the first, second, third, and fourth strain zones. The flexible PCB is disposed on the upper surface of the elastic body and located inside the third and fourth strain grooves. The cable is electrically connected to the flexible PCB.

[0008] Preferably, the upper surface of the elastomer is provided with a mounting loading surface around the periphery of the first strain groove, the second strain groove, the third strain groove and the fourth strain groove, and the weighing platform is disposed on the mounting loading surface.

[0009] Preferably, the eight strain gauges are a first strain gauge, a second strain gauge, a third strain gauge, a fourth strain gauge, a fifth strain gauge, a sixth strain gauge, a seventh strain gauge, and an eighth strain gauge. The first and second strain gauges are spaced apart in the first strain region along the width direction of the elastic body, the third and fourth strain gauges are spaced apart in the second strain region along the width direction of the elastic body, the fifth and sixth strain gauges are spaced apart in the third strain region along the width direction of the elastic body, and the seventh and eighth strain gauges are spaced apart in the fourth strain region along the width direction of the elastic body.

[0010] Preferably, the second strain gauge and the fifth strain gauge, as well as the fourth strain gauge and the seventh strain gauge, respectively constitute positive bridge arms, and the first strain gauge and the sixth strain gauge, as well as the third strain gauge and the eighth strain gauge, respectively constitute negative bridge arms.

[0011] Preferably, both the first strain gauge and the second strain gauge include a first longitudinal strain gauge, a connecting strain gauge, and two second longitudinal strain gauges. The two second longitudinal strain gauges are respectively arranged parallel to each other inside the first longitudinal strain gauge and are connected by the connecting strain gauge. The length of the two second longitudinal strain gauges is smaller than the length of the first longitudinal strain gauge.

[0012] Preferably, the third strain groove and the fourth strain groove each include at least two transverse strain grooves, a U-shaped connecting strain groove and two third longitudinal strain grooves. Any two adjacent transverse strain grooves are connected by the U-shaped connecting strain groove. The two third longitudinal strain grooves are perpendicularly connected to the two ends of the transverse strain grooves located at both ends of the length direction of the elastic body. The third longitudinal strain grooves are parallel to the second longitudinal strain grooves and have the same length.

[0013] Preferably, a foot pad is also provided, which is disposed on the upper surface of the elastomer and located between the first longitudinal strain groove and the second longitudinal strain groove.

[0014] Compared with the prior art, this utility model has the following advantages:

[0015] This invention features a strain gauge with both positive and negative strain. The strain gauge design ensures equal positive and negative strain within the strain gauge. Four strain gauges compensate for corner errors, improving product accuracy. Its flat design makes it suitable for small-space shelving and eliminates the need for corner error compensation. Weighing accuracy is maintained at any position on the sensor platform, allowing for real-time monitoring of precise inventory quantities (through weight conversion) and automatic inventory data updates, eliminating the need for manual inventory checks. Furthermore, it monitors the weight of each storage location in real time. When the weight approaches or exceeds the design load, the system issues an audible and visual alarm or sends a notification to prevent shelving collapse. Attached Figure Description

[0016] Figure 1 This is an exploded structural diagram of a flat shelf weighing sensor according to the present invention;

[0017] Figure 2 This is a schematic diagram of the structure of the elastic body in a flat shelf weighing sensor according to this utility model;

[0018] Figure 3 This is a schematic diagram of the distribution structure of eight strain gauges in a flat shelf weighing sensor according to this utility model. Detailed Implementation

[0019] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0020] In the description of this utility model, it should be understood that the terms "left," "right," etc., indicating the orientation or positional relationship are based on the accompanying drawings. Figure 1 The orientations or positional relationships shown are for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] Example 1

[0023] like Figures 1 to 3 As shown, this embodiment provides a flat shelf weighing sensor, including a weighing platform 1, an elastic body 2, eight strain gauges 3, a flexible PCB 4, and a cable 5. The weighing platform 1 is disposed on the upper surface of the elastic body 2. The elastic body 2 has a flat cuboid structure. The upper surface of the elastic body 2 is provided with a first strain gauge 21, a second strain gauge 22, a third strain gauge 23, and a fourth strain gauge 24. The first strain gauge 21 and the second strain gauge 22 are symmetrically arranged at both ends of the elastic body along its length, and the third strain gauge 23 and the fourth strain gauge 24 are symmetrically arranged on both sides of the elastic body along its length. A first strain zone 211 and a fourth strain zone 214 are respectively provided between the strain groove 21 and the third strain groove 23 and the fourth strain groove 24. A second strain zone 212 and a third strain zone 213 are respectively provided between the second strain groove 22 and the third strain groove 23 and the fourth strain groove 24. Two strain gauges 3 are respectively provided on the first strain zone 211, the second strain zone 212, the third strain zone 213, and the fourth strain zone 214. The flexible PCB4 is disposed on the upper surface of the elastic body 2 and located inside the third strain groove 23 and the fourth strain groove 24. The cable 5 is electrically connected to the flexible PCB4.

[0024] In this embodiment, a loading surface 20 is provided around the upper surface of the elastomer 2 and outside the first strain groove, the second strain groove, the third strain groove and the fourth strain groove. The weighing platform 1 is mounted on the loading surface 20 by double-sided adhesive.

[0025] In this embodiment, the eight strain gauges 3 are a first strain gauge, a second strain gauge, a third strain gauge, a fourth strain gauge, a fifth strain gauge, a sixth strain gauge, a seventh strain gauge, and an eighth strain gauge. The first and second strain gauges are spaced apart on a strain region 211 in the width direction of the elastic body. The third and fourth strain gauges are spaced apart on a second strain region 212 in the width direction of the elastic body. The fifth and sixth strain gauges are spaced apart on a third strain region 213 in the width direction of the elastic body. The seventh and eighth strain gauges are spaced apart on a fourth strain region 214 in the width direction of the elastic body.

[0026] In this embodiment, the second strain gauge and the fifth strain gauge, as well as the fourth strain gauge and the seventh strain gauge, respectively constitute positive bridge arms, while the first strain gauge and the sixth strain gauge, as well as the third strain gauge and the eighth strain gauge, respectively constitute negative bridge arms. Each strain zone has both positive and negative strain. The design of the strain groove ensures that the positive and negative strains in the strain zone are equal. The four strain zones can compensate for corner errors, thereby improving product accuracy. The flexible PCB arranges eight strain gauges into a bridge circuit. This bridge arm design, while not requiring high precision in patch placement, effectively reduces corner errors, indicating that the sensor's structural design has relatively high precision.

[0027] In this embodiment, the first strain groove 21 and the second strain groove 22 each include a first longitudinal strain groove, a connecting strain groove and two second longitudinal strain grooves. The two second longitudinal strain grooves are respectively arranged in parallel on the inner side of the first longitudinal strain groove and are connected by the connecting strain groove. The length of the two second longitudinal strain grooves is smaller than the length of the first longitudinal strain groove.

[0028] In this embodiment, the third strain groove 23 and the fourth strain groove 24 each include at least two transverse strain grooves, a U-shaped connecting strain groove and two third longitudinal strain grooves. Any two adjacent transverse strain grooves are connected through the U-shaped connecting strain groove. The two third longitudinal strain grooves are perpendicularly connected to the two ends of the transverse strain grooves located at both ends of the length direction of the elastic body. The third longitudinal strain grooves are parallel to the second longitudinal strain grooves and have the same length.

[0029] In this embodiment, a foot pad 6 is also provided, which is disposed on the upper surface of the elastic body 2 and located between the first longitudinal strain groove and the second longitudinal strain groove.

[0030] The working principle of this embodiment will be further explained below:

[0031] When the object to be measured is placed on the weighing platform, the platform transmits force to the elastic body through the mounting loading surface, which causes the sensor elastic body to deform under the force and generate strain. As a result, the resistance of the strain gauge changes, and the bridge circuit converts this into a change in sensor voltage. The four strain zones can compensate for the four-corner error caused by the different positions of the object to be measured on the weighing platform.

[0032] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A flat shelf weighing sensor, characterized in that, The system includes a weighing platform (1), an elastomer (2), eight strain gauges (3), a flexible PCB (4), and a cable (5). The weighing platform (1) is disposed on the upper surface of the elastomer (2). The elastomer (2) has a flat rectangular parallelepiped structure. The upper surface of the elastomer (2) is provided with a first strain groove (21), a second strain groove (22), a third strain groove (23), and a fourth strain groove (24). The first strain groove (21) and the second strain groove (22) are symmetrically located at both ends of the elastomer along its length. The third strain groove (23) and the fourth strain groove (24) are symmetrically located on both sides of the elastomer along its length. The first strain groove (21) and the third strain groove (24) are... 3) A first strain zone (211) and a fourth strain zone (214) are respectively provided between the fourth strain groove (24). A second strain zone (212) and a third strain zone (213) are respectively provided between the second strain groove (22) and the third strain groove (23) and the fourth strain groove (24). Two strain gauges (3) are respectively provided on the first strain zone (211), the second strain zone (212), the third strain zone (213) and the fourth strain zone (214). The flexible PCB (4) is disposed on the upper surface of the elastic body (2) and located inside the third strain groove (23) and the fourth strain groove (24). The cable (5) is electrically connected to the flexible PCB (4).

2. The flat shelf weighing sensor according to claim 1, characterized in that, The upper surface of the elastomer (2) is provided with a loading surface (20) around the first strain groove, the second strain groove, the third strain groove and the fourth strain groove, and the weighing platform (1) is provided on the loading surface (20).

3. A flat shelf weighing sensor according to claim 2, characterized in that, The eight strain gauges (3) are a first strain gauge, a second strain gauge, a third strain gauge, a fourth strain gauge, a fifth strain gauge, a sixth strain gauge, a seventh strain gauge, and an eighth strain gauge. The first strain gauge and the second strain gauge are spaced apart in the first strain region (211) in the width direction of the elastic body. The third strain gauge and the fourth strain gauge are spaced apart in the second strain region (212) in the width direction of the elastic body. The fifth strain gauge and the sixth strain gauge are spaced apart in the third strain region (213) in the width direction of the elastic body. The seventh strain gauge and the eighth strain gauge are spaced apart in the fourth strain region (214) in the width direction of the elastic body.

4. A flat shelf weighing sensor according to claim 3, characterized in that, The second strain gauge and the fifth strain gauge, as well as the fourth strain gauge and the seventh strain gauge, respectively constitute positive bridge arms, and the first strain gauge and the sixth strain gauge, as well as the third strain gauge and the eighth strain gauge, respectively constitute negative bridge arms.

5. A flat shelf weighing sensor according to claim 4, characterized in that, The first strain groove (21) and the second strain groove (22) each include a first longitudinal strain groove, a connecting strain groove and two second longitudinal strain grooves. The two second longitudinal strain grooves are respectively arranged in parallel on the inner side of the first longitudinal strain groove and are connected by the connecting strain groove. The length of the two second longitudinal strain grooves is smaller than the length of the first longitudinal strain groove.

6. A flat shelf weighing sensor according to claim 5, characterized in that, The third strain groove (23) and the fourth strain groove (24) each include at least two transverse strain grooves, a U-shaped connecting strain groove and two third longitudinal strain grooves. Any two adjacent transverse strain grooves are connected by the U-shaped connecting strain groove. The two third longitudinal strain grooves are perpendicularly connected to the two ends of the transverse strain grooves located at both ends of the length direction of the elastic body. The third longitudinal strain grooves are parallel to the second longitudinal strain grooves and have the same length.

7. A flat shelf weighing sensor according to claim 6, characterized in that, It is also provided with a foot pad (6), which is disposed on the upper surface of the elastomer (2) and located between the first longitudinal strain groove and the second longitudinal strain groove.

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