A Strain Beam Sensing Device with a Dual Force-Received Model and Its Usage Method

Abstract

The present invention provides a novel strain beam sensing device with a dual force-bearing model, comprising: an elastic gasket; a gasket-type sensor disposed on the elastic gasket and capable of receiving the deformation of the elastic gasket, a cantilever beam is provided in the middle of the gasket-type sensor, at least a part of a strain gauge is provided on the cantilever beam, and the strain gauge includes a strain beam sensor with a dual force-bearing model; and a control circuit, which generates an output signal of the sensing device based on the output signal of the strain gauge 7.

Description

Technical Field

[0001] The present invention relates to a gravity sensor, and more specifically, to a dual-force model strain beam sensing device and a method for using the same. Background Art

[0002] A gravity sensor, also known as a gravity transducer, is a new type of sensor technology. It uses an elastic sensitive element to form a cantilever displacement device, and an energy storage spring made of an elastic sensitive element to drive an electrical contact to complete the conversion from gravity change to an electrical signal. The gravity sensor works based on the principle of the piezoelectric effect. The so-called piezoelectric effect is that "for a non-centrosymmetric heteropolar crystal, the external force applied to the crystal will not only cause the crystal to deform, but also change the polarization state of the crystal, establish an electric field inside the crystal, and this phenomenon of polarization of the medium due to the action of mechanical force is called the positive piezoelectric effect". The gravity sensor utilizes the characteristic that the crystal inside it deforms due to acceleration. Since this deformation generates a voltage, as long as the relationship between the generated voltage and the applied acceleration is calculated, the acceleration can be converted into a voltage output. Of course, there are many other methods to make an acceleration sensor, such as the capacitance effect, the thermal bubble effect, the optical effect, but their most basic principle is that acceleration causes a certain medium to deform, and by measuring the deformation amount and converting it into a voltage output using a related circuit.

[0003] So far, the gravity sensors on the market mainly include several types such as S-type, cantilever type, spoke type, plate ring type, diaphragm type, bridge type, and column cylinder type. These sensors all require a relatively large installation space, and to a large extent, they need to change the appearance of the measured product, with a relatively complex structure, relatively high cost, and relatively low accuracy. Summary of the Invention

[0004] In view of the above problems, the present invention provides a novel dual-force model strain beam sensing device, including:

[0005] Elastic gasket 3;

[0006] A gasket-type sensor 2 disposed on the elastic gasket 3 and capable of receiving the deformation of the elastic gasket 3. A cantilever beam 6 is provided in the middle of the gasket-type sensor 2, and at least a part of a strain gauge 7 is provided on the cantilever beam 6. The strain gauge includes a dual-force model strain beam sensor 8; and

[0007] A control circuit 5 that generates an output signal of the sensing device based on the output signal of the strain gauge 7;

[0008] The double-force model strain beam sensor 8 includes a first sensing grid 9 with a first mode-bearing strain beam and a second sensing grid 10 with a second mode-bearing strain beam. The first sensing grid 9 is arranged on the cantilever beam 6, and the second sensing grid 10 is arranged outside the cantilever beam 6.

[0009] Wherein, the second sensing grid 10 and the gasket-type sensor form a simply supported strain beam; the first sensing grid 9 and the gasket-type sensor form a cantilever strain beam.

[0010] According to one aspect of the present invention, the double-force model strain beam sensing device further includes an upper end plate 1 and a lower end plate 4. The upper end plate 1 is on the gasket-type sensor 2. A groove 11 is formed in the lower part of the upper end plate 1, and at least a part of the strain gauge 7 is accommodated in the groove 11. The lower end plate 4 is under the elastic gasket 3.

[0011] According to one aspect of the present invention, the cantilever beam 6 of the double-force model strain beam sensing device includes a head end and a tail end. The head end is used to connect with the gasket-type sensor 2, and there is no connection between the tail end and the gasket-type sensor 2.

[0012] According to one aspect of the present invention, the cantilever beam 6 of the double-force model strain beam sensing device and the gasket-type sensor 2 are integrally formed.

[0013] According to one aspect of the present invention, the gasket-type sensor 2 of the double-force model strain beam sensing device is provided with a hollow in the middle, and the cantilever beam 6 is formed on the tongue part surrounded by the hollow.

[0014] According to one aspect of the present invention, the gasket-type sensor 2 of the double-force model strain beam sensing device has a U-shaped hollow in the middle, and the cantilever beam 6 is in the shape of a rectangular tongue.

[0015] According to one aspect of the present invention, the first sensing grid 9 of the double-force model strain beam sensing device is a vertical sensing grid consistent with the extending direction of the cantilever beam 6, and the second sensing grid 10 is a horizontal sensing grid substantially perpendicular to the extending direction of the cantilever beam 6.

[0016] According to one aspect of the present invention, the control circuit 5 of the double-force model strain beam sensing device generates an output signal of the sensing system based on the output signals of the first sensing grid and the second sensing grid.

[0017] According to one aspect of the present invention, the control circuit 5 of the double-force model strain beam sensing device is a Wheatstone bridge.

[0018] According to one aspect of the present invention, the elastic bodies of the gasket-type sensor 2 and the cantilever beam 6 of the double-force model strain beam sensing device are made of 65Mn spring steel.

[0019] According to one aspect of the present invention, there is provided a method for measuring the property constants of the double-force model strain beam sensing device as described above.

[0020] Let the double-force model strain beam sensing device bear an object with a weight of a kg.

[0021] Measure the working voltage of the double-force model strain beam sensing device as b v.

[0022] Measure the output of the double-force model strain beam sensing device as c mv / v.

[0023] Calculate the property constant of the double-force model strain beam sensing device as K = a ÷ (b × c).

[0024] According to one aspect of the present invention, in the method for measuring the property constants of the double-force model strain beam sensing device, the double-force model strain beam sensing device bears a weight of full-scale load.

[0025] According to one aspect of the present invention, there is provided a weight detection method. Using the double-force model strain beam sensing device as described above, assuming the property constant of the double-force model strain beam sensing device is k', and when weighing, the differential pressure Uo formed by the first sensitive grid and the second sensitive grid of the double-force model strain beam sensing device, then the weight borne by the double-force model strain beam sensing device is: F = k' * Uo.

[0026] Technical effects of the present invention:

[0027] The present invention applies a strain gauge including a double-force model strain beam sensor to the gasket-type sensor 2 capable of freely deforming, which can form a linear output. In addition, since the two strain beams belong to different force models, the same strain gauge senses the stresses of the two strain beams, forms a differential pressure, and increases the output, solving the problem that the output of a single strain beam of a small-range sensor is small and affects the accuracy, and effectively enhancing the sensitivity and accuracy of the sensor during application. Description of the Drawings

[0028] The 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 to the present invention. In the drawings:

[0029] Figure 1 A three-dimensional exploded view of the double-force model strain beam sensing device according to an embodiment of the present invention is shown;

[0030] Figure 2 Shows a three-dimensional view of a double-force model strain beam sensing device according to an embodiment of the present invention;

[0031] Figure 3 Shows a top view of the gasket-type sensor 2 of the double-force model strain beam sensing device according to an embodiment of the present invention;

[0032] Figure 4 Shows a top view of the strain gauge of the double-force model strain beam sensing device according to an embodiment of the present invention;

[0033] Figure 5 Shows a three-dimensional view of the upper end plate of the double-force model strain beam sensing device according to an embodiment of the present invention;

[0034] Figure 6 Shows a three-dimensional view of the lower end plate of the double-force model strain beam sensing device according to an embodiment of the present invention;

[0035] Figure 7 Shows a structural diagram of the simply supported strain beam of the double-force model strain beam sensing device according to an embodiment of the present invention;

[0036] Figure 8 Shows a working schematic diagram of the simply supported strain beam of the double-force model strain beam sensing device according to an embodiment of the present invention;

[0037] Figure 9 Shows a schematic diagram of the force model of the simply supported strain beam of the double-force model strain beam sensing device according to an embodiment of the present invention;

[0038] Figure 10 Shows a structural diagram of the cantilever strain beam of the double-force model strain beam sensing device according to an embodiment of the present invention;

[0039] Figure 11 Shows the force model of the cantilever strain beam of the double-force model strain beam sensing device according to an embodiment of the present invention;

[0040] Figure 12 Shows a structural diagram of the control circuit 5 of the double-force model strain beam sensing device according to an embodiment of the present invention being a Wheatstone bridge;

[0041] Figure 13 Shows the output of the double-force model strain beam sensing device when the 4th double-force model strain beam sensing device in the above table is used in the double-force model strain beam sensing device of the present invention; and

[0042] Figure 14Shows the output of the double-force model strain beam sensing device in the double-force model strain beam sensing device of the present invention when using the 4 double-force model strain beam sensing devices in the above table. Detailed implementation

[0043] In the following, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present invention. Therefore, the drawings and the description are considered to be exemplary in nature rather than restrictive.

[0044] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0045] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection: it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include indirect contact between the first and second features through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0047] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, components and settings of specific examples are described hereinafter. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those of ordinary skill in the art can recognize the application of other processes and / or the use of other materials.

[0048] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0049] An embodiment of the present invention provides a dual-force model strain beam sensing device. Figure 1 A three-dimensional exploded view of a dual-force model strain beam sensing device according to an embodiment of the present invention is shown. Figure 2 A three-dimensional view of a dual-force model strain beam sensing device according to an embodiment of the present invention is shown. Figure 3 A top view of the gasket-type sensor 2 of the dual-force model strain beam sensing device according to an embodiment of the present invention is shown. Specifically, from Figure 1 、 Figure 2 and Figure 3 it can be seen that a dual-force model strain beam sensing device of the present invention includes: an elastic gasket 3; a gasket-type sensor 2 disposed on the elastic gasket 3 and capable of receiving the deformation of the elastic gasket 3, a cantilever beam 6 is provided in the middle of the gasket-type sensor 2, at least a part of a strain gauge 7 is provided on the cantilever beam 6, the strain gauge includes a dual-force model strain beam sensor 8; and a control circuit 5, which generates an output signal of the sensing device based on the output signal of the strain gauge 7.

[0050] According to one aspect of the present invention, the double-force model strain beam transmission device further includes an upper end plate 1 and a lower end plate 4. The upper end plate 1 is on the gasket-type sensor 2. A groove 11 is formed in the lower part of the upper end plate 1, and at least a part of the strain gauge 7 is received in the groove 11. The lower end plate 4 is under the elastic gasket 3.

[0051] Specifically, in Figure 1 and Figure 2 In an example of the double-force model strain beam sensing device shown, the double-force model strain beam transmission device is composed of an upper end plate 1, a gasket-type sensor 2, an elastic rubber washer 3, and a lower end plate 4 from top to bottom, and all components are fixedly tightened. The fixing method can be tightening with countersunk bolts, or gluing, or other fixing methods well-known in the art.

[0052] Two protruding flexible sleeves are provided on the elastic rubber pad 3. The outer diameter of the flexible sleeve is in transitional fit with the diameter of the mounting hole on the gasket-type sensor 2, and the inner diameter of the flexible sleeve is in transitional fit with the diameter of the pre-tightening bolt, so that the gasket-type sensor 2 can freely deform after being stressed.

[0053] Figure 5 Fig. shows a perspective view of the upper end plate of the double-force model strain beam sensing device according to an embodiment of the present invention. The upper end plate is a dish-shaped metal workpiece. Two grooves 11 are formed in the front and back of the lower part of the upper end plate. The size of the grooves 11 must be able to accommodate the upward deflection of the gasket-type sensor 2 after being stressed, and the two pointed points at the lower edge of the grooves 11 serve as the two fulcrums of the gasket-type sensor 2. The upper end plate is provided with two threaded holes and two round holes. The two threaded holes are used to install the pre-tightening bolts of the double-force model strain beam sensing device, and the two round holes are the mounting holes of the double-force model strain beam sensing device.

[0054] Figure 6 Fig. shows a perspective view of the lower end plate of the double-force model strain beam sensing device according to an embodiment of the present invention. The lower end plate is a round cake-shaped metal workpiece. Two counterbores for accommodating the bolt heads are provided in the lower part of the lower end plate, and the bolt heads after assembly enter the counterbores by 2-3 mm. The specific dimensions can also be appropriately adjusted according to the range of the double-force model strain beam sensing device.

[0055] According to one aspect of the present invention, as Figure 3 shown, in the double-force model strain beam sensing device, the cantilever beam 6 includes a head end and a tail end. The head end is used to connect with the gasket-type sensor 2, and there is no connection between the tail end and the gasket-type sensor 2.

[0056] According to one aspect of the present invention, in the double-force model strain beam sensing device, the cantilever beam 6 and the gasket-type sensor 2 are integrally formed.

[0057] According to one aspect of the present invention, in the double-force model strain beam sensing device, the middle of the gasket-type sensor 2 is provided with a hollow, and the gasket-type sensor 2 forms the cantilever beam 6 at the tongue portion surrounded by the hollow.

[0058] Specifically, as Figure 3 shown, a tongue-shaped cantilever beam 6 is formed in the middle of the gasket-type sensor 2 by means of hollowing.

[0059] According to one aspect of the present invention, in the double-force model strain beam sensing device, the middle of the gasket-type sensor 2 has a U-shaped hollow, and the cantilever beam 6 has a rectangular tongue shape.

[0060] According to one aspect of the present invention, in the double-force model strain beam sensing device, the strain gauge includes a first sensitive grid 9 having a first stress-bearing strain beam and a second sensitive grid 10 having a second stress-bearing strain beam. The first sensitive grid 9 is arranged on the cantilever beam 6, and the second sensitive grid 10 is arranged outside the cantilever beam 6.

[0061] According to one aspect of the present invention, in the double-force model strain beam sensing device, the first sensitive grid 9 is a vertical sensitive grid consistent with the extending direction of the tongue portion, and the second sensitive grid 10 is a horizontal sensitive grid substantially perpendicular to the extending direction of the tongue portion.

[0062] Specifically, Figure 4 shows a top view of the strain gauge of the double-force model strain beam sensing device according to an embodiment of the present invention. The vertical grid of the strain gauge is attached to the "tongue"-shaped flat plate in the middle of the gasket-type sensor 2 (as shown in FIGS. 3 and Figure 4 at the position), forming a sensor cantilever-type strain beam. The horizontal grid of the strain gauge is attached to the flat plate near the edge at the lower part of the gasket-type sensor 2 (as shown in Figure 3 and Figure 4 at the position), forming a sensor simply supported-type strain beam. The strain gauge adopts a 2AB configuration half-bridge sensor, and the two resistors 9 and 10 are respectively of vertical sensitive grid and horizontal sensitive grid structures. The strain gauge substrate can adopt modified phenolic resin, and the sensitive grid substrate material can adopt Evan foil material.

[0063] From Figure 3 it can be seen that the double-force model strain beam sensing device of the present invention designs two strain beams, belonging to different force models, and the same strain gauge senses the stresses of the two strain beams, which will be described in detail below.

[0064] (1) Sensor simply supported-type strain beam

[0065] The horizontal grid 10 of the strain gauge of the gasket-type sensor 2 forms a strain beam with the gasket-type sensor 2 in the area where it is located. Figure 7A structural diagram of a simply supported strain beam of a dual-force model strain beam sensing device according to an embodiment of the present invention is shown. Figure 8 FIG. 2 shows a schematic diagram of the operation of a simply supported strain beam of a strain beam sensing device of a dual-force model according to an embodiment of the present invention. Figure 7 and Figure 8 When the strain beam sensor device of the double-force model shown is subjected to force, the gasket-type sensor 2 arches upward with the sharp point of the lower edge of the upper end plate groove 11 as a fulcrum, so that the horizontal grid 10 of the sensitive grid is stretched, and the tensile strain resistance value of the horizontal grid 10 increases.

[0066] Figure 9 A schematic diagram of the force model of a simply supported strain beam of a dual-force model strain beam sensor device according to an embodiment of the present invention is shown. This force model satisfies the following relationship: the force F applied to the dual-force model strain beam sensor device is linearly related to the force F1 applied to the strain beam; the force F1 on the strain beam is linearly related to the resistance change value of the sensitive grid 9; the resistance change value of the sensitive grid 9 is linearly related to its voltage output U1. Therefore, the force F applied to the dual-force model strain beam sensor device is linearly related to the output U1 of the strain beam, that is, U1=K1*F, where K1 is a constant.

[0067] (2) Sensor cantilever strain beam

[0068] Figure 10 FIG. 2 shows a structural diagram of a cantilever strain beam of a dual-force model strain beam sensing device according to an embodiment of the present invention. Figure 10 As shown, the vertical grid 9 of the sensitive grid of the gasket type sensor 2 strain gauge and the "tongue" shaped part in the U-shaped groove of the gasket type sensor 2 in the area form a strain beam. When the double-force model strain beam sensing device is subjected to force, the "tongue" shaped part of the gasket type sensor 2 tilts upward, causing the vertical grid 9 of the sensitive grid to be compressed, and the compressive strain resistance value of the vertical grid 9 decreases.

[0069] Figure 11 The force model of the cantilever strain beam of the dual-force model strain beam sensor device according to an embodiment of the present invention is shown. This force model satisfies the following relationship: the force F applied to the dual-force model strain beam sensor device is linearly related to the force F2 applied to the strain beam; the force F2 on the strain beam is linearly related to the resistance change value of the sensitive grid vertical grid 9; the resistance change value of the sensitive grid vertical grid 9 is linearly related to its voltage output U2. Therefore, the force F applied to the dual-force model strain beam sensor device is linearly related to the output U2 of the strain beam, that is, U2=K2*F, where K2 is a constant.

[0070] It can be seen that the present invention applies a strain gauge including a double-force model strain beam sensor to the gasket-type sensor 2 capable of free deformation, which can form a linear output. In addition, since the two strain beams belong to different force models, the same strain gauge senses the stresses of the two strain beams to form a differential pressure and increase the output, solving the problem that the output of a single strain beam of a small-range sensor is small and affecting the accuracy, and effectively enhancing the sensitivity and accuracy of the sensor during application.

[0071] According to one aspect of the present invention, in the double-force model strain beam sensing device, the control circuit 5 generates an output signal of the sensing system based on the output signals of the first sensitive grid and the second sensitive grid.

[0072] Specifically, as Figure 3 shown, the control circuit 5 obtains the output signals of the vertical grid and the horizontal grid of the strain gauge and generates an output signal.

[0073] According to one aspect of the present invention, in the double-force model strain beam sensing device, the control circuit 5 is a Wheatstone bridge.

[0074] Specifically, Figure 12 shows a structural diagram of the control circuit 5 of the double-force model strain beam sensing device according to an embodiment of the present invention being a Wheatstone bridge. In the example, the sensitive grids 9 and 10 are used as adjacent bridge arms and connected to two other resistors with the same resistance value to form a Wheatstone bridge. When the double-force model strain beam sensing device is stressed, the resistance value of the sensitive grid 9 decreases, and the resistance value of the sensitive grid 10 increases.

[0075] It can be seen that when the range of the present double-force model strain beam sensing device is small, the outputs of the two strain beams are both small. In the prior art, the small output is not conducive to the signal amplification processing of the control module, thereby affecting the accuracy of the double-force model strain beam sensing device. On the contrary, the present invention applies a strain gauge including a double-force model strain beam sensor to the gasket-type sensor 2 capable of free deformation, which can form a linear output. In addition, since the two strain beams belong to different force models, the same strain gauge senses the stresses of the two strain beams to form a differential pressure and increase the output, solving the problem that the output of a single strain beam of a small-range sensor is small and affecting the accuracy, and effectively enhancing the sensitivity and accuracy of the sensor during application.

[0076] The working principle of the double-force model strain beam sensing device of the present invention is described below. The present double-force model strain beam sensing device adopts a double elastic body solution. One is the elastic gasket 3 (for example, a polymer elastic rubber pad), and the other is the gasket-type sensor 2. The two elastic bodies can be one flexible body and one rigid body, which can sense and transmit strain in combination. The steps of sensing and calculating the pressure of the shown double-force model strain beam sensing device are as follows:

[0077] 1. Pressure is applied above the double-force model strain beam sensing device;

[0078] 2. After the double-force model strain beam sensing device is pressurized, the elastic rubber pad in the assembly deforms;

[0079] 3. The pressure is transmitted to the cantilever strain beam and the simply supported strain beam of the gasket-type sensor 2;

[0080] 4. The cantilever beam of the gasket-type sensor 2 deforms, and at the same time, the simply supported beam generates deflection;

[0081] 5. The strain gauges on the cantilever beam and the simply supported beam of the gasket-type sensor 2 generate strain accordingly;

[0082] 6. The vertical grid of the sensitive grid of the strain gauge is compressed and the resistance decreases, while the horizontal grid is stretched and the resistance increases;

[0083] 7. The sensitive grid of the strain gauge generates a differential pressure signal output through a Wheatstone bridge;

[0084] 8. The voltage change signal is output to the control module;

[0085] 9. The control module calculates the pressure after processing the signal.

[0086] According to one aspect of the present invention, in the double-force model strain beam sensing device, the elasticity of the gasket-type sensor 2 and the cantilever beam 6 is made of 65Mn spring steel.

[0087] Specifically, the gasket-type sensor 2 is made of 65Mn spring steel, and the steel is heat-treated by quenching at 60 degrees and tempering at 45 degrees. Two mounting holes are provided on the gasket-type sensor 2 for accommodating the flexible sleeves on the elastic rubber pad.

[0088] According to one aspect of the present invention, a method for measuring the property constants of the double-force model strain beam sensing device

[0089] Make the double-force model strain beam sensing device bear an object with a weight of a kg;

[0090] Measure the working voltage of the double-force model strain beam sensing device as b v;

[0091] Measure the output of the double-force model strain beam sensing device as c mv / v;

[0092] Calculate the property constant of the double-force model strain beam sensing device as K = a ÷ (b × c).

[0093] Specifically, the sensitive grids 9 and 10 of the two strain beams are connected to the same Wheatstone bridge. When the double-force model strain beam sensing device is stressed, the resistance value of the sensitive grid 9 decreases, and the resistance value of the sensitive grid 10 increases, just forming a differential pressure output. That is

[0094] Uo = UI + U2 = K1*F + K2*F = (K1 + K2)*F

[0095] Then there is

[0096] F = 1 / (K1 + K2)*Uo

[0097] Let K = 1 / (K1 + K2)

[0098] That is F = K*Uo, where K is a constant.

[0099] It can be seen that theoretically, the output of the double-force model strain beam sensing device of the present invention has a linear relationship with the force applied to it.

[0100] According to one aspect of the present invention, in the method for calculating the attribute constant of the double-force model strain beam sensing device, the double-force model strain beam sensing device bears a weight that is the full-scale load.

[0101] Specifically, the double-force model strain beam sensing device can be calibrated at two points: the zero point and the full-scale point. Apply the full-scale load to the double-force model strain beam sensing device, and the ratio of the load value to the voltage output of the double-force model strain beam sensing device is the K value.

[0102] For example, the full scale of a certain double-force model strain beam sensing device is 10 Kg, the output under the full-scale load is 2 mv / v, and the working voltage of the double-force model strain beam sensing device is 5 v. Then K = 10 / (2*5) = 1.

[0103] In an engineering practice, the design of this double-force model strain beam sensing device is applied and good results are obtained.

[0104] In another example, a method for calculating the attribute constant of the double-force model strain beam sensing device is shown. Five practical double-force model strain beam sensing devices are used to measure the test data when each double-force model strain beam sensing device is in use.

[0105]

[0106] Figure 13 The output of the double-force model strain beam sensing device in the double-force model strain beam sensing device of the present invention when using the double-force model strain beam sensing device 4 in the above table is shown. The actual measurement shows that the linearity of the output value of the double-force model strain beam sensing device is good, the output value is moderate, and the accuracy error is about 1%.

[0107] Figure 14 The output of the dual-force model strain beam sensing device in the dual-force model strain beam sensing device of the present invention is shown when the above 5 dual-force model strain beam sensing devices in the table are adopted. From Figure 14 it can be seen that from the comparison of the test data of the 5 dual-force model strain beam sensing devices, the consistency is good.

[0108] According to one aspect of the present invention, a weight detection method is provided. The above-mentioned dual-force model strain beam sensing device is adopted. Let the attribute constant of the dual-force model strain beam sensing device be k'. When weighing, the differential pressure Uo formed by the first sensitive grid and the second sensitive grid of the dual-force model strain beam sensing device, then the weight borne by the dual-force model strain beam sensing device is: F = k' * Uo. The present invention applies a strain gauge including a dual-force model strain beam sensor to the gasket-type sensor 2 capable of free deformation, which can form a linear output. In addition, since the two strain beams belong to different force models, the same strain gauge senses the stresses of the two strain beams, forms a differential pressure, and increases the output, solving the problem that the output of a single strain beam of a small-range sensor is small and affects the accuracy, and effectively enhancing the sensitivity and accuracy of the sensor during application.

[0109] Although the foregoing disclosure shows exemplary embodiments of the present invention, it should be noted that various changes and modifications can be made without departing from the scope defined by the claims. In addition, although the elements of the present invention can be described or claimed in an individual form, multiple elements can also be contemplated, unless explicitly limited to a single element.

[0110] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A double-force model strain beam sensing device, characterized in that Comprising: Elastic gasket (3); A gasket-type sensor (2) disposed on the elastic gasket (3) and capable of receiving the deformation of the elastic gasket (3). A cantilever beam (6) is provided in the middle of the gasket-type sensor (2), and at least a part of a strain gauge (7) is provided on the cantilever beam (6). The strain gauge includes a double-force model strain beam sensor (8); And A control circuit (5), which generates an output signal of the sensing device based on the output signal of the strain gauge (7); The double-force model strain beam sensor (8) includes a first sensitive grid (9) having a first stress-bearing mode strain beam and a second sensitive grid (10) having a second stress-bearing mode strain beam. The first sensitive grid (9) is arranged on the cantilever beam (6), and the second sensitive grid (10) is arranged outside the cantilever beam (6); Wherein, the second sensitive grid (10) and the gasket-type sensor form a simply supported strain beam; the first sensitive grid (9) and the gasket-type sensor form a cantilever strain beam.

2. The double-force model strain beam sensing device according to claim 1, characterized in that, It further includes an upper end plate (1) and a lower end plate (4). The upper end plate (1) is on the gasket-type sensor (2). A groove (11) is opened at the lower part of the upper end plate (1), and at least a part of the strain gauge (7) is accommodated in the groove (11). The lower end plate (4) is under the elastic gasket (3).

3. The dual-force model strain beam sensing device according to claim 1, wherein The cantilever beam (6) includes a head end and a tail end. The head end is used to connect with the gasket-type sensor (2), and there is no connection between the tail end and the gasket-type sensor (2).

4. The double-force model strain beam sensing device according to claim 1, wherein, The cantilever beam (6) and the gasket-type sensor (2) are integrally formed.

5. The double-force model strain beam sensing device according to claim 1, characterized in that The middle of the gasket-type sensor (2) is set to be hollowed out, and the cantilever beam (6) is formed at the tongue part surrounded by the hollowing out of the gasket-type sensor (2).

6. The double-force model strain beam sensing device according to claim 5, wherein The middle of the gasket-type sensor (2) has a U-shaped hollowing out, and the cantilever beam (6) is in the shape of a rectangular tongue.

7. The double-force model strain beam sensing device according to claim 1, characterized in that The first sensitive grid (9) is a vertical sensitive grid consistent with the extending direction of the cantilever beam (6), and the second sensitive grid (10) is a horizontal sensitive grid substantially perpendicular to the extending direction of the cantilever beam (6).

8. The double-force model strain beam sensing device according to claim 1, characterized in that The control circuit (5) generates an output signal of the sensing system based on the output signals of the first sensitive grid and the second sensitive grid.

9. The dual-force model strain beam sensing device according to claim 8, characterized in that, The control circuit (5) is a Wheatstone bridge.

10. The double-force model strain beam sensing device according to claim 1, characterized in that, The elastic bodies of the gasket-type sensor (2) and the cantilever beam (6) are made of 65Mn spring steel.

11. A method for measuring the characteristic constants of the double-force model strain beam sensing device according to claim 1, characterized in that Let the double-force model strain beam sensing device bear an object with a weight of a kg; Measure the working voltage of the double-force model strain beam sensing device as b v; Measure the output of the double-force model strain beam sensing device as c mv / v; Calculate the characteristic constant of the double-force model strain beam sensing device as K = a ÷ (b × c).

12. The method according to claim 11, wherein The double-force model strain beam sensing device bears a weight of full-scale load.

13. A weight detection method, characterized in that, Adopt the double-force model strain beam sensing device described in claim 1. Assume that the attribute constant of the double-force model strain beam sensing device is k'. When weighing, the differential pressure Uo formed by the first sensitive grid and the second sensitive grid of the double-force model strain beam sensing device, then the weight borne by the double-force model strain beam sensing device is: F = k' * Uo.

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