Elastic body structure of force sensor and force sensor

Abstract

The utility model provides a force sensor elastomer structure and a force sensor, and relates to the field of sensors. The elastic body structure of the force sensor comprises an elastic body, a first strain gauge and a second strain gauge, the elastic body is provided with two opposite installation side faces in the thickness direction of the elastic body, the first strain gauge and the second strain gauge are both arranged on the same installation side face of the elastic body, and the first strain gauge and the second strain gauge are arranged at intervals in the length direction of the elastic body; the elastic body is provided with a stress part located between the first strain gauge and the second strain gauge. The structural design of the elastomer can simplify the manufacturing process, reduce the processing and manufacturing difficulty, improve the processing and manufacturing efficiency and reduce the processing and manufacturing cost.

Description

Technical Field

[0001] The utility model relates to the field of sensors, in particular to an elastic body structure of a force-sensitive sensor and a force-sensitive sensor. Background Art

[0002] At present, the resistance strain type pressure and weighing force sensitive sensors are mainly made by sticking the resistance strain gauge on the sensor elastic body with adhesive. During bonding, two resistance strain gauges are respectively adhered to the opposite sides of the sensor elastic body, and the two resistance strain gauges are connected by wires to form a Wheatstone bridge.

[0003] The inventors have found that the elastic structure of the prior art has at least the following disadvantages:

[0004] The two resistance strain gauges are respectively bonded to the opposite sides of the sensor elastic body, and the process is complicated and the processing efficiency is low. In addition, the relative positions of the two resistance strain gauges on both sides are difficult to align, and the processing difficulty is high, which also reduces the processing efficiency. Utility Model Content

[0005] The purpose of the utility model is to provide a force-sensitive sensor elastic body structure and a force-sensitive sensor, which can simplify the process, reduce the difficulty of processing and manufacturing, improve the processing and manufacturing efficiency, and reduce the processing and manufacturing cost.

[0006] The embodiment of the utility model is achieved as follows:

[0007] In a first aspect, the utility model provides a force-sensitive sensor elastic body structure, comprising:

[0008] An elastomer, a first strain gauge and a second strain gauge, wherein the elastomer has two mounting sides opposite to each other in the thickness direction thereof, the first strain gauge and the second strain gauge are both arranged on the same mounting side of the elastomer, and the first strain gauge and the second strain gauge are arranged at intervals in the length direction of the elastomer; and the elastomer has a force-bearing portion located between the first strain gauge and the second strain gauge.

[0009] In an optional embodiment, the elastomer has two first side surfaces opposite to each other in a width direction thereof, and two stress adjustment grooves are provided on at least one of the two first side surfaces. The two stress adjustment grooves are arranged in a length direction of the elastomer, and the first strain gauge and the second strain gauge correspond to the two stress adjustment grooves respectively.

[0010] Based on the above scheme, by setting a stress adjustment groove, the width of the elastomer corresponding to the installation position of the strain gauge can be reduced. When the elastomer is subjected to external force, it can be deformed at the position corresponding to the strain gauge, so that the stress is concentrated at the position where the strain gauge is located, and the strain is the highest, which is beneficial for the strain gauge to obtain the deformation state of the elastomer and improve the sensitivity of the force sensitive sensor.

[0011] In an optional embodiment, the two stress adjustment grooves located on the same side are arranged symmetrically.

[0012] Based on the above scheme, after the elastic body is subjected to force, the deformation of the elastic body at the positions corresponding to the two strain gauges is basically the same, and the measurement accuracy of the force sensitive sensor is high. In addition, the symmetrically arranged stress adjustment grooves make the structure of the elastic body regular and easy to process and manufacture.

[0013] In an optional embodiment, two stress adjustment grooves are provided on each of the first side surfaces, and the two stress adjustment grooves corresponding to the first strain gauge are symmetrically arranged, and the two stress adjustment grooves corresponding to the second strain gauge are symmetrically arranged.

[0014] Based on the above solution, by arranging stress adjustment grooves on both first side surfaces, the structure of the elastic body is regular and the deformation is stable, which is conducive to the strain gauge to obtain the deformation of the elastic body.

[0015] In an optional embodiment, two identification portions are provided on at least one of the two first side surfaces.

[0016] Based on the above scheme, by setting an identification part as a position reference when installing the strain gauge, that is, the strain gauge itself has an identification position. When the strain gauge and the elastomer are installed, the identification position on the strain gauge cooperates with the identification part on the elastomer, which can quickly locate the position of the strain gauge relative to the elastomer, improve the accuracy of the strain gauge installation position, and enable the weighing sensor to achieve better comprehensive performance and higher linearity.

[0017] In an optional embodiment, the two identification portions located on the same side are arranged symmetrically.

[0018] Based on the above scheme, the structure of the elastomer is regular and easy to process and manufacture.

[0019] In an optional embodiment, the identification portion is configured as an identification groove or an identification protrusion.

[0020] Based on the above solution, the structure of the identification part is simple, which is convenient for processing the device and for processing and manufacturing the elastomer.

[0021] In an optional embodiment, the elastic body is provided with two connecting parts distributed on both sides of the force-bearing part, and the first strain gauge and the second strain gauge are both located between the two connecting parts.

[0022] Based on the above scheme, the elastic body can be conveniently fixed to the housing of the force-sensitive sensor through the connecting part. For example, the connecting part can be a through hole or a slot. When the connecting part is a through hole, a fastener such as a screw can be inserted into the through hole to fix the elastic body to the housing. Alternatively, when the connecting part is a slot, one end of the connecting part can be clamped at a corresponding position on the housing, and the other end can also be fixed by a fastener such as a screw, thereby improving the convenience of installation.

[0023] In an optional embodiment, the force-sensitive sensor elastomeric structure further includes a protective layer, wherein the protective layer is connected to the elastomer, and the protective layer covers the first strain gauge and / or the second strain gauge.

[0024] Based on the above solution, the protective layer can be a moisture-proof glue, which can better protect and moisture-proof the strain gauge and extend the service life of the force sensitive sensor.

[0025] In a second aspect, the utility model provides a force-sensitive sensor, the force-sensitive sensor comprising:

[0026] The force-sensitive sensor elastomeric structure according to any of the aforementioned embodiments.

[0027] The beneficial effects of the embodiments of the utility model are:

[0028] In summary, the force-sensitive sensor elastomer provided in this embodiment can save installation steps, reduce installation difficulty, improve installation efficiency, and reduce installation costs by arranging the first strain gauge and the second strain gauge on the same installation side of the elastomer. That is, during installation, it is only necessary to use one of the installation sides of the elastomer as a reference plane for positioning once, and after positioning, the first strain gauge and the second strain gauge are directly installed on the other installation side of the elastomer. Compared with the traditional method of arranging the two strain gauges on the two opposite sides of the elastomer, the steps of flipping the elastomer and re-positioning the elastomer are omitted, simplifying the installation process. In addition, the first strain gauge and the second strain gauge are located on the same side, and the relative positions of the two are easy to adjust, and it is also easy to connect the first strain gauge and the second strain gauge with a wire, thereby improving the installation accuracy of the force-sensitive sensor and improving the accuracy of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1A schematic diagram of the elastic structure of the force-sensitive sensor according to an embodiment of the utility model;

[0031] Figure 2 It is a partial schematic diagram of the elastic structure of the force sensitive sensor according to an embodiment of the present utility model.

[0032] icon:

[0033] 001-first axis of symmetry; 002-second axis of symmetry; 100-elastic body; 110-installation side; 120-first side; 121-first groove; 122-second groove; 123-third groove; 124-fourth groove; 125-identification part; 130-second side; 140-force-bearing part; 150-connecting part; 200-first strain gauge; 300-second strain gauge; 400-connecting wire; 500-protective layer. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0037] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0038] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0039] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In the prior art, strain gauges are installed on opposite sides of the elastic body 100 of the force-sensitive sensor, and the strain gauges on both sides are connected by wires to form a Wheatstone bridge. Since the two strain gauges are distributed on opposite sides of the elastic body 100, the two strain gauges need to be installed in sequence. In this way, the elastic body 100 needs to be positioned twice, which increases the installation error, increases the installation process, and reduces the installation efficiency and quality. At the same time, since the two strain gauges are distributed on both sides of the elastic body 100, when the two strain gauges are connected by wires, the wires need to extend from one side of the elastic body 100 to the other side, which is inconvenient to install.

[0041] In view of this, the designer provides an elastic structure of a force-sensitive sensor, which can simplify the installation process, reduce the installation difficulty, improve the installation efficiency, improve the installation quality, and reduce the installation cost.

[0042] In this embodiment, it should be noted that the elastic structure of the force-sensitive sensor can be applicable to but not limited to the sensor of a hand dynamometer.

[0043] Please combine Figure 1 and Figure 2 In this embodiment, the elastic body structure of the force-sensitive sensor includes an elastic body 100, a first strain gauge 200 and a second strain gauge 300. The elastic body 100 has two mounting side surfaces 110 opposite to each other in the thickness direction thereof. The first strain gauge 200 and the second strain gauge 300 are both arranged on the same mounting side surface 110 of the elastic body 100. The first strain gauge 200 and the second strain gauge 300 are arranged at intervals in the length direction of the elastic body 100. The elastic body 100 has a force-bearing portion 140 located between the first strain gauge 200 and the second strain gauge 300.

[0044] Based on the above, the elastic body structure of the force-sensitive sensor provided in this embodiment has at least the following advantages:

[0045] By arranging the first strain gauge 200 and the second strain gauge 300 on the same installation side 110 of the elastic body 100, it is possible to save installation steps, reduce installation difficulty, improve installation efficiency, and reduce installation costs. That is, during installation, it is only necessary to use one of the installation side 110 of the elastic body 100 as a reference surface for positioning once, and after positioning, the first strain gauge 200 and the second strain gauge 300 are directly installed on the other installation side 110 of the elastic body 100. Compared with the traditional method of arranging two strain gauges on two opposite sides of the elastic body 100, the steps of flipping the elastic body 100 and re-positioning the elastic body 100 are omitted, simplifying the installation process. In addition, the first strain gauge 200 and the second strain gauge 300 are located on the same side, and the relative positions of the two are easy to adjust. It is also easy to connect the first strain gauge 200 and the second strain gauge 300 with a wire, thereby improving the installation accuracy of the force-sensitive sensor and improving the use accuracy.

[0046] The following embodiments illustrate the details of the elastic structure of the force-sensitive sensor provided in the present application by way of examples.

[0047] Please combine Figure 1 and Figure 2 In this embodiment, optionally, the elastic body structure of the force-sensitive sensor includes an elastic body 100, a first strain gauge 200, a second strain gauge 300 and a connecting wire 400. The elastic body 100 is configured as a strip, and the elastic body 100 has two mounting side surfaces 110 opposite to each other in its thickness direction, two first side surfaces 120 opposite to each other in its width direction, and two second side surfaces 130 opposite to each other in its length direction. The first strain gauge 200 and the second strain gauge 300 are mounted on the same mounting side surface 110 of the elastic body 100, and the first strain gauge 200 and the second strain gauge 300 are electrically connected through the connecting wire 400 to form a Wheatstone bridge. The first strain gauge 200 and the second strain gauge 300 can be fixed on the elastomer 100 by bonding, and the first strain gauge 200 and the second strain gauge 300 are arranged at intervals in the length direction of the elastomer 100. Furthermore, the first strain gauge 200 and the second strain gauge 300 are symmetrically arranged with the first symmetry axis 001 which is the midline of the elastomer 100 extending in the width direction thereof as the first symmetry axis, and the entire elastomer 100 is symmetrically arranged relative to the first symmetry axis 001.

[0048] Optionally, the force-bearing portion 140 of the elastic body 100 is located in the middle of the length direction of the elastic body 100, and the force-bearing portion 140 can be provided with a through hole for connecting with a pull rod or other components, and the through hole can be a threaded hole, which is convenient for screwing and fixing with other components such as the pull rod. Alternatively, the force-bearing portion 140 can be set as a protrusion, and an external force is applied to the protrusion to cause the middle position of the elastic body 100 to deform, thereby transmitting the deformation to the first strain gauge 200 and the second strain gauge 300 on both sides.

[0049] Please combine Figure 2 Optionally, two stress adjustment grooves are provided on both first side surfaces 120, and the four stress adjustment grooves are respectively a first groove 121, a second groove 122, a third groove 123 and a fourth groove 124. The first groove 121 and the second groove 122 are located on the same side and are symmetrically arranged relative to the first symmetry axis 001, and the third groove 123 and the fourth groove 124 are located on the same side and are symmetrically arranged relative to the first symmetry axis 001. In addition, the elastic body 100 also has a second symmetry axis 002 extending in the length direction thereof, and the second symmetry axis 002 is located in the middle position in the width direction of the elastic body 100, and the first symmetry axis 001 and the second symmetry axis 002 are arranged vertically. The first groove 121 and the third groove 123 are symmetrically arranged relative to the second symmetry axis 002, and the second groove 122 and the fourth groove 124 are symmetrically arranged relative to the second symmetry axis 002.

[0050] The width of the stress adjustment groove is consistent with the length direction of the elastic body 100. The first strain gauge 200 is located in the area defined by the width of the first groove 121 or the third groove 123 of the elastic body 100. Correspondingly, the second strain gauge 300 is located in the area defined by the width of the second groove 122 or the fourth groove 124 of the elastic body 100. The stress generated when the elastic body 100 is subjected to force is better transmitted to the first strain gauge 200 and the second strain gauge 300.

[0051] By setting the stress adjustment groove, the width of the elastomer 100 corresponding to the installation position of the strain gauge can be reduced. When the elastomer 100 is subjected to external force, it can be deformed at the position corresponding to the strain gauge, so that the stress is concentrated at the position where the strain gauge is located and the strain is the highest, which is beneficial for the strain gauge to obtain the deformation state of the elastomer 100 and improve the sensitivity of the force sensitive sensor.

[0052] Furthermore, an identification portion 125 is disposed on the bottom wall of each stress adjustment groove, the two identification portions 125 on the same side are symmetrically disposed relative to the first symmetry axis 001 , and the identification portions 125 on different sides are symmetrically disposed relative to the second symmetry axis 002 .

[0053] It should be understood that the identification portion 125 may be a groove or a protrusion, and the identification portion 125 serves as a reference position for installing the strain gauge on the elastic body 100. By setting the identification portion 125 as a position reference when installing the strain gauge, that is, the strain gauge itself has an identification position, when the strain gauge is installed on the elastic body 100, the identification position on the strain gauge cooperates with the identification portion 125 on the elastic body 100, so that the position of the strain gauge relative to the elastic body 100 can be quickly located, thereby improving the accuracy of the installation position of the strain gauge, so that the weighing sensor can achieve better comprehensive performance and higher linearity.

[0054] It should be understood that in other embodiments, two stress adjustment grooves may be provided on only one first side surface 120 , or two identification portions 125 may be provided on only one first side surface 120 .

[0055] Optionally, the elastic body 100 is further provided with two connecting parts 150, and the two connecting parts 150 can be two through holes symmetrically arranged with the first symmetry axis 001, and each through hole can be a threaded hole, so as to facilitate fixing the elastic body 100 to the housing of the force-sensitive sensor by fasteners such as screws. Alternatively, both connecting parts 150 are card slots, and the two card slots are respectively provided on the two second side surfaces 130 and are symmetrically arranged. The shape and size of the connecting parts 150 on the elastic body 100 are set as required, and can adapt to different usage scenarios.

[0056] In this embodiment, optionally, after the first strain gauge 200 and the second strain gauge 300 are installed on the elastic body 100, a protective layer 500 may be provided on the elastic body 100. There may be two protective layers 500, corresponding to the first strain gauge 200 and the second strain gauge 300 respectively. The protective layer 500 may cover the first strain gauge 200 and the second strain gauge 300, thereby playing a protective role and extending the service life of the first strain gauge 200 and the second strain gauge 300. The protective layer 500 may be moisture-proof glue.

[0057] The elastic body structure of the force-sensitive sensor provided in this embodiment is simple in structure, easy to process, and reduces the processing cost. When in use, the two ends are fixed, and the middle is subjected to force to produce strain, thereby causing a bridge differential pressure to achieve voltage output.

[0058] This embodiment also provides a force-sensitive sensor, including the above-mentioned force-sensitive sensor elastomer structure. The force-sensitive sensor can be applied to electronic products with force measuring functions, such as force gauges, dynamometers, and tensioners. It can also be applied to products for weighing, such as weight scales, body scales, luggage scales, etc.

[0059] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model can be modified and varied in various ways. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model, including but not limited to size, hole shape, force mode, force direction, etc., shall be included in the protection scope of the utility model.

Claims

1. A force-sensitive sensor elastic structure, characterized in that: include: An elastic body (100), a first strain gauge (200) and a second strain gauge (300), wherein the elastic body (100) has two mounting side surfaces (110) opposite to each other in the thickness direction thereof, the first strain gauge (200) and the second strain gauge (300) are both arranged on the same mounting side surface (110) of the elastic body (100), and the first strain gauge (200) and the second strain gauge (300) are arranged at intervals in the length direction of the elastic body (100); and the elastic body (100) has a force-bearing portion (140) located between the first strain gauge (200) and the second strain gauge (300).

2. The elastic structure of the force sensitive sensor according to claim 1, characterized in that: The elastic body (100) has two first side surfaces (120) that are opposite to each other in the width direction thereof, at least one of the two first side surfaces (120) is provided with two stress adjustment grooves, the two stress adjustment grooves are arranged in the length direction of the elastic body (100), and the first strain gauge (200) and the second strain gauge (300) correspond to the two stress adjustment grooves respectively.

3. The elastic structure of the force sensitive sensor according to claim 2, characterized in that: The two stress adjustment grooves located on the same side are arranged symmetrically.

4. The elastic structure of the force sensitive sensor according to claim 2, characterized in that: Two stress adjustment grooves are provided on each of the first side surfaces (120), and the two stress adjustment grooves corresponding to the first strain gauge (200) are symmetrically arranged, and the two stress adjustment grooves corresponding to the second strain gauge (300) are symmetrically arranged.

5. The elastic structure of the force sensitive sensor according to claim 2, characterized in that: Two identification portions (125) are provided on at least one of the two first side surfaces (120).

6. The elastic structure of the force sensitive sensor according to claim 5, characterized in that: The two identification parts (125) located on the same side are arranged symmetrically.

7. The elastic structure of the force sensitive sensor according to claim 5, characterized in that: The identification portion (125) is configured as an identification groove or an identification protrusion.

8. The elastic structure of the force sensitive sensor according to claim 1, characterized in that: The elastic body (100) is provided with two connecting parts (150) distributed on both sides of the force-bearing part (140), and the first strain gauge (200) and the second strain gauge (300) are both located between the two connecting parts (150).

9. The elastic structure of the force sensitive sensor according to claim 1, characterized in that: The force-sensitive sensor elastic body structure further comprises a protective layer (500), wherein the protective layer (500) is connected to the elastic body (100), and the protective layer (500) covers the first strain gauge (200) and / or the second strain gauge (300).

10. A force sensitive sensor, characterized in that: The force sensitive sensor comprises: The force sensitive sensor elastomeric structure according to any one of claims 1 to 9.

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