A planar bias load cell

Abstract

The utility model relates to a kind of plane anti-bias load sensor, belong to load sensor technical field, including support push rod, including lower bearing plate, the upper bearing plate is equipped in the upside of lower bearing plate, several elastic plate bodies are equipped between lower bearing plate and upper bearing plate, each elastic plate body obtains electric energy and mutually receives and transmits information with outside by mutually independent transmission bus, and elastic plate body includes elastic slab, strain cavity is opened in the side center of elastic slab, several strain chips electrically connected with transmission bus are installed in strain cavity, the both sides of upper bearing plate and lower bearing plate are equipped with several bolt hole positions, signal complementation is realized by the signal of two elastic plate bodies, signal compensation to the bias load influence of sensor is implemented, simplify overall component quantity, compress overall height, realize long-term stable anti-bias load high-precision measurement effect, and have very wide range of measurement.

Description

Technical Field

[0001] This utility model relates to the field of load sensor technology, specifically to a planar anti-offset load sensor. Background Technology

[0002] The load-bearing part of a conventional load cell is usually a screw hole or blind hole, which bears the load through bolts, indenters, and steel balls. The fixed end of a conventional load cell uses a single row of two holes for fixing. In environments with large impact, large vibration, quasi-dynamic conditions, or even when the weighing instrument has to withstand bidirectional forces, conventional load cells cannot adapt, resulting in inaccurate weighing or even damage to the load cell.

[0003] Patent CN211121555U discloses an anti-eccentric load column-type load cell, which includes a column-shaped elastic body and a base with a swing hole. One end of the elastic body is a bearing head part for supporting a steel ball and the top surface is set as a concave spherical surface. The other end of the elastic body is a fixed support bearing end and is swayable and located in the swing hole. The pressure cap restricts the fixed support bearing end to be set in the swing hole.

[0004] In summary, when the planar sensor in the prior art is subjected to a force that is not perpendicular to the measurement plane or the point of application is off-center, its output signal will produce significant errors. At the same time, the prior art adds mechanical structures to distribute the off-center load, but this increases the size, cost and complexity. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems and shortcomings by providing a planar anti-offset load sensor, thereby improving overall work efficiency.

[0006] The technical problem solved by this utility model is: (1) When the planar sensor in the prior art is subjected to a force that is not perpendicular to the measurement plane or the point of application is off-center, its output signal will produce significant errors; (2) Existing technologies distribute off-center loads by adding mechanical structures, but this increases volume, cost and complexity.

[0007] The objective of this utility model can be achieved through the following technical solution: A planar anti-eccentric load sensor includes a lower support plate, an upper support plate is provided directly above the lower support plate, and a number of elastic plates are provided between the lower support plate and the upper support plate. Each elastic plate obtains electrical energy through an independent transmission bus and sends and receives information with the outside world. Each elastic plate includes an elastic plate, and a strain chamber is provided at the center of one side of the elastic plate. A number of strain chips electrically connected to the transmission bus are installed in the strain chamber. A number of bolt holes are provided on both sides of the upper support plate and the lower support plate.

[0008] Preferably, there are two elastic plates, which are symmetrically arranged, and the openings of the two strain chambers face outward and are coaxial.

[0009] Preferably, a transverse strain bar is fixedly connected inside the strain chamber and located in the middle of the inner wall of the elastic plate, and vertical strain bars are fixedly connected to both sides of the middle of the transverse strain bar.

[0010] Preferably, the ends of both the transverse strain rod and the vertical strain rod are fixedly connected to the inner peripheral sidewall of the strain chamber.

[0011] Preferably, the thickness of the transverse strain bar and the vertical strain bar is 20% to 80% of the depth of the strain chamber.

[0012] Preferably, the strain gauge includes a first chip and a second chip, and two of each are provided. The two first chips are respectively fixedly connected to the side surfaces of the two vertical strain gauges, and the two second chips are respectively fixedly connected to the side surfaces of the two ends of the transverse strain gauge.

[0013] Preferably, a cluster plug is installed on one side of the elastic plate. The cluster plug is connected to the strain chamber. The first chip and the second chip are both electrically connected to the cluster plug through a transmission line. The cluster plug is electrically connected to the transmission bus.

[0014] Preferably, the elastic plate is fixedly connected to both the upper and lower ends with connecting blocks, and the elastic plate is fixedly connected to the lower bearing plate and the upper bearing plate respectively through the connecting blocks. Both sides of the connecting blocks are provided with width-limiting adjustment grooves, and the width of the connecting blocks is consistent with the diameter of the strain chamber.

[0015] Preferably, the sidewall of the elastic plate is provided with a snap-fit ​​annular groove around the opening of the strain chamber, and a protective cover plate is installed in the strain chamber through the snap-fit ​​annular groove.

[0016] Preferably, the strain chamber is cylindrical, and the lower bearing plate, the elastic plate, and the upper bearing plate are integrally formed.

[0017] The beneficial effects of this utility model are as follows: (1) During operation, the two elastic plates, which are integrally formed with the lower and upper bearing plates, balance the force arm signal together. The signals of the two elastic plates complement each other, thereby achieving signal compensation for the off-center load effect of the sensor, stabilizing the overall measurement data dispersion, ensuring the measurement accuracy of the product, and facilitating installation through the upper and lower bearing plates and bolt holes. The bolts limit the overall structure, maintaining the connection stability of the overall structure and the resistance to various impacts. (2) During operation, the structure of the traditional column sensor is optimized, the elastic column is optimized into an elastic plate, and the strain chamber is opened by slotting, thereby simplifying the number of overall components, compressing the overall height, increasing the accuracy of perception of the influence of off-center load and signal compensation, overcoming the inherent shortcomings of column sensor in terms of anti-off-center load, anti-impact, and orientation error, improving the measurement accuracy, and combining and optimizing the characteristics of stable performance, excellent dynamic response, self-resettable and high measurement accuracy, to achieve long-term stable anti-off-center load high-precision measurement effect, and has an extremely wide range. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a side view of the overall structure of the elastic plate of this utility model; Figure 3 This is a schematic diagram of the internal structure of the strain chamber of this utility model; Figure 4 This is a side view of the overall structure of the transverse strain gauge and the vertical strain gauge of this utility model.

[0019] Explanation of reference numerals in the attached figures: 101. Lower support plate; 102. Upper support plate; 103. Elastic plate; 104. Transmission bus; 105. Bolt hole; 201. Elastic plate; 202. Connecting block; 203. Width limiting adjustment groove; 204. Strain chamber; 205. Lateral strain rod; 206. Vertical strain rod; 207. First chip; 208. Second chip; 209. Bundled plug; 210. Branch transmission line; 211. Snap-fit ​​annular groove; 212. Protective cover plate. Detailed Implementation

[0020] The specific embodiments of this utility model are described in detail below, but it should be understood that the protection scope of this utility model is not limited to the specific embodiments.

[0021] Please see Figure 1-4 As shown: A planar anti-eccentric load sensor includes a lower support plate 101, an upper support plate 102 is provided directly above the lower support plate 101, and a plurality of elastic plates 103 are provided between the lower support plate 101 and the upper support plate 102. Each elastic plate 103 obtains electrical energy and sends and receives information from the outside through an independent transmission bus 104. The elastic plate 103 includes an elastic plate 201. A strain chamber 204 is provided at the center of one side of the elastic plate 201. A plurality of strain chips electrically connected to the transmission bus 104 are installed in the strain chamber 204. A plurality of bolt holes 105 are provided on both sides of the upper support plate 102 and the lower support plate 101. In this embodiment, there are two elastic plates 103, and the two elastic plates 103 are arranged symmetrically. The openings of the two strain chambers 204 face outward and are coaxial. The strain chambers 204 are cylindrical. The lower support plate 101, the elastic plates 103 and the upper support plate 102 are integrally formed structures. In this embodiment, the two elastic plates 103, which are integrally formed with the lower support plate 101 and the upper support plate 102, jointly balance the force arm signal. Furthermore, the signals of the two elastic plates 103 complement each other, thereby compensating for the off-center load effect of the sensor, stabilizing the overall measurement data dispersion, and ensuring the measurement accuracy of the product. The upper support plate 102, the lower support plate 101, and the bolt holes 105 facilitate installation and provide bolt limit for the overall structure, maintaining the connection stability of the overall structure and resistance to various impacts.

[0022] A transverse strain rod 205 is fixedly connected to the middle of the inner wall of the elastic plate 201 within the strain chamber 204. Vertical strain rods 206 are fixedly connected to both sides of the middle of the transverse strain rod 205. Connecting blocks 202 are fixedly connected to both the upper and lower ends of the elastic plate 201, and the elastic plate 201 is fixedly connected to the lower bearing plate 101 and the upper bearing plate 102 respectively through the connecting blocks 202. Width-limiting adjustment grooves 203 are provided on both sides of the connecting blocks 202, and the width of the connecting blocks 202 is the same as the diameter of the strain chamber 204. A snap-fit ​​annular groove 211 is opened on the side wall of the elastic plate 201 around the opening of the strain chamber 204. A protective cover plate 212 is installed in the strain chamber 204 through the snap-fit ​​annular groove 211. The ends of the transverse strain rod 205 and the vertical strain rod 206 are connected to the strain chamber. The inner peripheral sidewall of chamber 204 is fixedly connected. The thickness of the transverse strain rod 205 and the vertical strain rod 206 is 20% to 80% of the depth of strain chamber 204. The strain chip includes a first chip 207 and a second chip 208. There are two of each first chip 207 and second chip 208. The two first chips 207 are fixedly connected to the side surfaces of the two vertical strain rods 206 respectively. The two second chips 208 are fixedly connected to the two end side surfaces of the transverse strain rod 205 respectively. A bundle plug 209 is installed on one side of the elastic plate 201. The bundle plug 209 is connected to the strain chamber 204. The first chip 207 and the second chip 208 are electrically connected to the bundle plug 209 through the branch transmission line 210. The bundle plug 209 is electrically connected to the transmission bus 104. The upper bearing plate 101, lower bearing plate 102, connecting block 202, elastic plate 201, transverse strain rod 205 and vertical strain rod 206 are integrally formed. In this embodiment, during production, a strain chamber 204 and a width-limiting adjustment groove 203 are opened on the elastic plate 103 by grooving, thereby forming the connecting block 202, transverse strain rod 205 and vertical strain rod 206. The thickness of the transverse strain rod 205 and the vertical strain rod 206 and the depth of the strain chamber 204 are adjusted to adjust the overall measurement range. In this embodiment, the first chip 207 and the second chip 208 simultaneously sense the extension and contraction of the transverse strain bar 205 and the vertical strain bar 206 under load, thereby generating corresponding electrical signals and outputting them through the transmission bus 104. The load is then calculated based on these electrical signals. The strain chamber 204 is protected by the protective cover plate 212 to prevent contamination and interference.

[0023] In summary, during operation, the two elastic plates 103, which are integrally formed with the lower bearing plate 101 and the upper bearing plate 102, jointly balance the force arm signal. Furthermore, the signals of the two elastic plates 103 complement each other, thereby compensating for the off-center load effect of the sensor, stabilizing the overall measurement data dispersion, and ensuring the measurement accuracy of the product. The upper bearing plate 102, the lower bearing plate 101, and the bolt holes 105 facilitate installation and provide bolt limit for the overall structure, maintaining the connection stability of the overall structure and resistance to various impacts. By optimizing the structure of the traditional column sensor, the elastic column is transformed into an elastic plate 103, and a strain chamber 204 is created by slotting. This simplifies the number of components, reduces the overall height, and increases the accuracy of sensing the influence of off-center loads and signal compensation. It overcomes the inherent shortcomings of column sensors in terms of resistance to off-center loads, impact resistance, and orientation errors, thereby improving measurement accuracy. Furthermore, it combines and optimizes the characteristics of stable performance, excellent dynamic response, self-resetting capability, and high measurement accuracy to achieve long-term stable high-precision measurement with resistance to off-center loads and has an extremely wide measurement range.

[0024] The above-disclosed embodiments are only a few specific examples of the present utility model. However, the embodiments of the present utility model are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present utility model.

Claims

1. A planar anti-offset load sensor, characterized in that, The system includes a lower support plate (101), an upper support plate (102) is provided directly above the lower support plate (101), and several elastic plates (103) are provided between the lower support plate (101) and the upper support plate (102). Each elastic plate (103) obtains electrical energy and sends and receives information with the outside world through an independent transmission bus (104). The elastic plate (103) includes an elastic plate (201). A strain chamber (204) is provided at the center of one side of the elastic plate (201). Several strain chips electrically connected to the transmission bus (104) are installed in the strain chamber (204). Several bolt holes (105) are provided on both sides of the upper support plate (102) and the lower support plate (101).

2. The planar anti-offset load sensor as described in claim 1, characterized in that, Two elastic plates (103) are provided, and the two elastic plates (103) are arranged symmetrically. The openings of the two strain chambers (204) face outward and are coaxial.

3. A planar anti-offset load sensor as described in claim 1, characterized in that, A transverse strain rod (205) is fixedly connected inside the strain chamber (204) and located in the middle of the inner wall of the elastic plate (201). A vertical strain rod (206) is fixedly connected to both sides of the middle of the transverse strain rod (205).

4. A planar anti-offset load sensor as described in claim 3, characterized in that, The ends of the transverse strain bar (205) and the vertical strain bar (206) are fixedly connected to the inner peripheral sidewall of the strain chamber (204).

5. A planar anti-offset load sensor as described in claim 3, characterized in that, The thickness of the transverse strain bar (205) and the vertical strain bar (206) is 20% to 80% of the depth of the strain chamber (204).

6. A planar anti-offset load sensor as described in claim 3, characterized in that, The strain gauge includes a first chip (207) and a second chip (208). There are two of each first chip (207) and second chip (208). The two first chips (207) are respectively fixedly connected to the side surfaces of the two vertical strain gauges (206), and the two second chips (208) are respectively fixedly connected to the two end side surfaces of the horizontal strain gauge (205).

7. A planar anti-offset load sensor as described in claim 6, characterized in that, A cluster plug (209) is installed on one side of the elastic plate (201). The cluster plug (209) is connected to the strain chamber (204). The first chip (207) and the second chip (208) are electrically connected to the cluster plug (209) through the branch transmission line (210). The cluster plug (209) is electrically connected to the transmission bus (104).

8. A planar anti-offset load sensor as described in claim 1, characterized in that, The elastic plate (201) is fixedly connected to both the upper and lower ends with connecting blocks (202), and the elastic plate (201) is fixedly connected to the lower bearing plate (101) and the upper bearing plate (102) respectively through the connecting blocks (202). The connecting blocks (202) are provided with width limiting adjustment grooves (203) on both sides, and the width of the connecting blocks (202) is consistent with the diameter of the strain chamber (204).

9. A planar anti-offset load sensor as described in claim 1, characterized in that, The elastic plate (201) has a snap-fit ​​annular groove (211) on its side wall and around the opening of the strain chamber (204), and the strain chamber (204) is fitted with a protective cover plate (212) through the snap-fit ​​annular groove (211).

10. A planar anti-offset load sensor as described in any one of claims 1-9, characterized in that, The strain chamber (204) is cylindrical, and the lower bearing plate (101), the elastic plate (103) and the upper bearing plate (102) are integrally formed structures.

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