Hybrid strain gauge

Abstract

The utility model discloses a hybrid strain gauge, and belongs to the technical field of strain gauges. The device mainly comprises a substrate; the first wire grid is adhered to one side of the end surface of the substrate; the tenth wire grid is adhered to the other side of the end face of the substrate, and the first wire grid and the tenth wire grid correspond to each other and are electrically connected with each other; pad groups are arranged on one side of the substrate, the number of the pad groups is consistent with that of the wire grids, each pad group is provided with a first group of pads, and the first group of pads are connected with the two ends of the first wire grid and the tenth wire grid. According to the hybrid strain gauge, connection is achieved, so that the strain gauge is simple in process operation, stable in performance and convenient to paste, and the precision of a multi-dimensional force sensor is improved to a great extent.

Description

Technical Field

[0001] This application relates to the field of strain gauge technology, specifically a hybrid strain gauge. Background Technology

[0002] A strain gauge is a sensitive element that converts changes in strain into a measurable electrical signal. It is primarily used to measure the deformation of an object under stress and is a common tool in engineering measurement and mechanical testing, with wide applications in aerospace, automotive manufacturing, civil engineering, and medical equipment.

[0003] The working principle of a strain gauge is based on the resistive strain effect: when an object is subjected to external force and experiences tension or compression, the strain gauge fixed on its surface will also change accordingly. This change manifests as a change in the resistivity of the strain gauge, and therefore its resistance value will change. This change in resistance value can be detected by a measuring circuit, thereby determining the strain condition of the object.

[0004] However, as multidimensional force testing becomes increasingly precise, conventional single straight and single inclined strain gauges have limited linearity, occupy a large amount of space, require a large number of gauges, and are costly, which no longer meet the current process and technical requirements. Therefore, it is necessary to provide a hybrid strain gauge to solve the above problems.

[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore may include information that does not constitute prior art. Summary of the Invention

[0006] Based on the aforementioned problems in the existing technology, the problem to be solved by this application is to provide a hybrid strain gauge that simplifies the strain gauge manufacturing process, ensures stable strain gauge performance, and facilitates strain gauge bonding, thereby greatly improving the accuracy of multidimensional force sensors.

[0007] The technical solution adopted by this application to solve its technical problem is: a hybrid strain gauge, including a substrate;

[0008] The first wire grid is attached to one side of the end face of the substrate;

[0009] The tenth wire grid is attached to the other side of the end face of the substrate, and the first wire grid and the tenth wire grid correspond to each other and are electrically connected;

[0010] A pad group is provided on one side of the substrate. The number of pad groups is the same as the number of wire grids. The pad group has a first set of pads, which are connected to the first wire grid and the tenth wire grid at both ends.

[0011] Further, the inner side of the first wire grid is provided with a second wire grid which is pasted on the substrate, the inner side of the tenth wire grid is provided with a ninth wire grid which is pasted on the substrate, the second wire grid and the ninth wire grid correspond to each other and are electrically connected, the inner side of the first group of pads is provided with a second group of pads which are connected with both ends of the second wire grid and the ninth wire grid.

[0012] Further, the inner side of the second wire grid is provided with a third wire grid which is pasted on the substrate, the inner side of the ninth wire grid is provided with an eighth wire grid which is pasted on the substrate, the third wire grid and the eighth wire grid correspond to each other and are electrically connected, the inner side of the second group of pads is provided with a third group of pads which are connected with both ends of the third wire grid and the eighth wire grid.

[0013] Further, the inner side of the third wire grid is provided with a fourth wire grid and a fifth wire grid, the inner side of the eighth wire grid is provided with a sixth wire grid and a seventh wire grid, the fourth wire grid and the fifth wire grid and the sixth wire grid and the seventh wire grid are all pasted on the substrate, the fourth wire grid and the seventh wire grid correspond to each other and are electrically connected, the fifth wire grid and the sixth wire grid correspond to each other and are electrically connected.

[0014] Further, the inner side of the third group of pads is provided with a fourth group of pads which are connected with both ends of the fourth wire grid and the seventh wire grid, the inner side of the fourth group of pads is provided with a fifth group of pads which are connected with both ends of the fifth wire grid and the sixth wire grid.

[0015] Further, the material of the substrate is a special polyimide film, the upper end of the substrate is provided with a covering layer which is a polyimide film material.

[0016] The application has the advantages that the mixed strain sheet provided by the application has simple process operation, small high-resistance heating amount, stable strain sheet performance, convenient strain sheet pasting, tin leaded pads, convenient operation, stable resistance, high reliability, and can greatly improve the accuracy of multi-dimensional force sensors.

[0017] In addition to the purposes, features and advantages described above, the application has other purposes, features and advantages. The application will be further described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0018] The drawings accompanying the specification of the application form a part of the specification and serve to further illustrate the application, its exemplary embodiments and its description, and do not constitute an improper limitation of the application. In the drawings:

[0019] Figure 1 It is a whole schematic diagram of a hybrid strain gauge in the present application;

[0020] Figure 2 It is a whole schematic diagram of a hybrid strain gauge in the present application; Figure 1 It is a schematic diagram of the connection of the middle pad;

[0021] Figure 3 It is a whole schematic diagram of a hybrid strain gauge in the present application; Figure 1 It is a schematic diagram of the compression of the base in the middle;

[0022] In the figure, the reference signs are as follows:

[0023] 1, first wire grid; 11, fifth group of pads; 12, fourth group of pads; 13, third group of pads; 14, second group of pads; 15, first group of pads; 16, base; 17, cover layer;

[0024] 2, second wire grid; 3, third wire grid; 4, fourth wire grid; 5, fifth wire grid; 6, sixth wire grid; 7, seventh wire grid; 8, eighth wire grid; 9, ninth wire grid; 10, tenth wire grid. DETAILED DESCRIPTION

[0025] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The technical solutions in the embodiments of the present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present application.

[0027] As shown in the figure, the present application provides a hybrid strain gauge, which comprises a base 16, one side of the end face of the base 16 is pasted with a first wire grid 1, and the other side of the end face of the base 16 is pasted with a tenth wire grid 10, the first wire grid 1 and the tenth wire grid 10 correspond to each other and are electrically connected, and are defined as a single horizontal grid, the resistance value is 700Ω, which can well respond to the horizontal force; Figure 1 Meanwhile, the inner side of the first wire grid 1 is also provided with a second wire grid 2, which is pasted on the base 16, and the inner side of the tenth wire grid 10 is provided with a ninth wire grid 9 pasted on the base 16, the second wire grid 2 and the ninth wire grid 9 correspond to each other and are electrically connected, and are defined as a single vertical grid, the resistance value is 350Ω, which can well respond to the vertical force;

[0028]

[0029] ​A third wire grid 3 is provided on the inner side of the second wire grid 2 and is attached to the substrate 16. An eighth wire grid 8 is provided on the inner side of the ninth wire grid 9 and is attached to the substrate 16. The third wire grid 3 and the eighth wire grid 8 correspond to each other and are electrically connected. It is a single vertical grid with a resistance value of 350Ω, which can effectively reflect vertical forces.

[0030] Furthermore, the inner side of the third wire grid 3 is provided with the fourth wire grid 4 and the fifth wire grid 5, while the inner side of the eighth wire grid 8 is provided with the sixth wire grid 6 and the seventh wire grid 7. The fourth wire grid 4 and the fifth wire grid 5, the sixth wire grid 6 and the seventh wire grid 7 are all attached to the substrate 16. In this application, the fourth wire grid 4 and the seventh wire grid 7 correspond to each other and are electrically connected. They are right-angled grids with a resistance value of 700Ω, which can effectively reflect the force in the right-angled direction.

[0031] Meanwhile, the fifth wire grid 5 and the sixth wire grid 6 correspond to each other and are electrically connected. They are left-slanted grids with a resistance of 700Ω, which can effectively reflect the force in the left-slanted direction.

[0032] like Figure 2 As shown, a pad group is provided on one side of the substrate 16. The number of pad groups is the same as the number of wire grids. The pad group has a first set of pads 15, which is connected to the two ends of the first wire grid 1 and the tenth wire grid 10. A second set of pads 14 is provided inside the first set of pads 15, which is connected to the two ends of the second wire grid 2 and the ninth wire grid 9.

[0033] Meanwhile, a third set of pads 13 is provided inside the second set of pads 14. The third set of pads 13 is connected to both ends of the third wire gate 3 and the eighth wire gate 8. A fourth set of pads 12 is provided inside the third set of pads 13. The fourth set of pads 12 is connected to both ends of the fourth wire gate 4 and the seventh wire gate 7. A fifth set of pads 11 is provided inside the fourth set of pads 12. The fifth set of pads 11 is connected to both ends of the fifth wire gate 5 and the sixth wire gate 6.

[0034] like Figure 3 As shown in this application, the material of the substrate 16 is a special polyimide film, which makes the substrate 16 rigid and has a low shrinkage rate. Furthermore, a cover layer 17 is provided on the upper end of the substrate 16. The cover layer 17 is made of polyimide film material, while constantan is the sensitive grid material. Therefore, the three are pressed together by a special process.

[0035] Therefore, the above installation and connection method simplifies the strain gauge process, reduces heat generation from high resistance, ensures stable strain gauge performance, facilitates strain gauge bonding, and allows for easy operation with soldered leads on the pads. The stable resistance value and high reliability can significantly improve the accuracy of multidimensional force sensors.

[0036] The above descriptions are only the preferred embodiments of the present application, and are not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A hybrid strain gauge characterized by: It comprises a substrate (16); A first wire grid (1) is pasted on one side of the end face of the substrate (16); A tenth wire grid (10) is pasted on the other side of the end face of the substrate (16), and the first wire grid (1) and the tenth wire grid (10) correspond to each other and are electrically connected. A pad group is arranged on one side of the substrate (16), the number of the pad group is consistent with the number of wire grids, the pad group has a first pad group (15), and the first pad group (15) is connected with both ends of the first wire grid (1) and the tenth wire grid (10).

2. A hybrid strain gauge according to claim 1, wherein: A second wire grid (2) is arranged on the inner side of the first wire grid (1), the second wire grid (2) is pasted on the substrate (16), a ninth wire grid (9) is arranged on the inner side of the tenth wire grid (10) and pasted on the substrate (16), the second wire grid (2) and the ninth wire grid (9) correspond to each other and are electrically connected, a second pad group (14) is arranged on the inner side of the first pad group (15), and the second pad group (14) is connected with both ends of the second wire grid (2) and the ninth wire grid (9).

3. A hybrid strain gauge according to claim 2, wherein: A third wire grid (3) is arranged on the inner side of the second wire grid (2) and pasted on the substrate (16), an eighth wire grid (8) is arranged on the inner side of the ninth wire grid (9) and pasted on the substrate (16), the third wire grid (3) and the eighth wire grid (8) correspond to each other and are electrically connected, a third pad group (13) is arranged on the inner side of the second pad group (14), and the third pad group (13) is connected with both ends of the third wire grid (3) and the eighth wire grid (8).

4. A hybrid strain gauge according to claim 3, wherein: A fourth wire grid (4) and a fifth wire grid (5) are arranged on the inner side of the third wire grid (3), a sixth wire grid (6) and a seventh wire grid (7) are arranged on the inner side of the eighth wire grid (8), the fourth wire grid (4) and the fifth wire grid (5) and the sixth wire grid (6) and the seventh wire grid (7) are pasted on the substrate (16), the fourth wire grid (4) and the seventh wire grid (7) correspond to each other and are electrically connected, and the fifth wire grid (5) and the sixth wire grid (6) correspond to each other and are electrically connected.

5. A hybrid strain gauge according to claim 4, wherein: A fourth pad group (12) is arranged on the inner side of the third pad group (13), the fourth pad group (12) is connected with both ends of the fourth wire grid (4) and the seventh wire grid (7), a fifth pad group (11) is arranged on the inner side of the fourth pad group (12), and the fifth pad group (11) is connected with both ends of the fifth wire grid (5) and the sixth wire grid (6).

6. A hybrid strain gauge according to claim 5, wherein: The material of the substrate (16) is a special polyimide film, and an upper end of the substrate (16) is provided with a covering layer (17), and the covering layer (17) is made of a polyimide film material.

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