A strain gauge for a large impact sensor

Abstract

The utility model relates to strain gauge technical field for big impact sensor, specifically related to a strain gauge for big impact sensor, including base, sensitive grid and lands, the sensitive grid and land all cover on the base, the land is connected with the sensitive grid, the adjacent side end face of land is passed through the transition of reverse fillet, through the reverse fillet processing of land vertex angle position, can slow down the stress concentration of strain gauge for big impact sensor when receiving big impact, realizes stress dispersion, reduces the damage probability of strain gauge for big impact sensor, improves the use reliability.

Description

Technical Field

[0001] This utility model relates to the technical field of strain gauges for large impact sensors, and specifically to a strain gauge for large impact sensors. Background Technology

[0002] Cars, high-speed trains, and airplanes have become the three most commonly used modes of transportation for people. Their safety is directly related to the life safety of every passenger. Once a safety accident occurs, it may cause a large number of casualties and have a wide-ranging impact.

[0003] To ensure operational safety, various safety tests are conducted on automobiles and high-speed trains before they officially begin operation to verify their reliability. Among these tests, crash testing is a mandatory component. During crash testing, the impact force is an instantaneous signal with a short duration and high frequency, making measurement difficult. Conventional testing systems cannot meet the requirements, necessitating impact-resistant testing systems with high dynamic response speeds. These impact-resistant testing systems require impact force sensors for support.

[0004] Due to its high accuracy and mature technology, resistance strain gauge sensors have gradually become the industry's preferred solution. Impact-resistant force sensors are developed based on this principle. However, because impact-resistant force sensors require instantaneous signal acquisition over a long period and under high impact force, conventional resistance strain gauges cannot meet the demands of large impact tests. This can easily lead to strain gauge malfunctions, such as wire and solder joint detachment, capping peeling from the sensing grid, and easy peeling of the sensing grid from the substrate. Ultimately, this results in the force sensor failing to acquire relevant data during the impact, causing the impact test to fail, and thus failing to meet practical application requirements. Utility Model Content

[0005] The purpose of this invention is to provide a strain gauge for large impact sensors, thereby solving the technical problem of low reliability of current strain gauges for large impact sensors.

[0006] The solution of this utility model to the above-mentioned technical problems is as follows:

[0007] A strain gauge for a large impact sensor includes a substrate, a sensitive grid, and pads. The sensitive grid and pads are both covered on the substrate. The pads are connected to the sensitive grid, and the adjacent side faces of the pads are transitioned by rounded corners.

[0008] Furthermore, the radius of the fillet is not less than 0.3 mm.

[0009] Further specified, the radius of the fillet is 0.3mm to 0.5mm.

[0010] Further specified, both the sensitive gate and the pad are covered with a capping film, the pad has a wiring hole, and the capping film is located around the wiring hole.

[0011] Further specified, the number of pads is two, both pads are connected to the sensitive gate, and the two pads are located on the same side of the sensitive gate or on opposite sides of the sensitive gate.

[0012] Further defined, the sensitive gate includes a dual-axis first sensitive gate and a dual-axis second sensitive gate, and the pad includes a dual-axis first pad, a dual-axis second pad, and a dual-axis third pad;

[0013] The first dual-axis sensitive gate is located on one side of the second dual-axis sensitive gate, and the angle between the first dual-axis sensitive gate and the second dual-axis sensitive gate is 90°. The third dual-axis pad is located between the first dual-axis sensitive gate and the second dual-axis sensitive gate. The third dual-axis pad is connected to one end of the first dual-axis sensitive gate and one end of the second dual-axis sensitive gate, respectively. The first dual-axis pad is connected to the other end of the first dual-axis sensitive gate, and the second dual-axis pad is connected to the other end of the second dual-axis sensitive gate.

[0014] Further defined, the sensitive gate includes a dual-axis first sensitive gate and a dual-axis second sensitive gate, and the pad includes a dual-axis first pad, a dual-axis second pad, a dual-axis third pad, and a dual-axis fourth pad;

[0015] The first and second dual-axis pads are both connected to the first dual-axis sensitive gate, and the third and fourth dual-axis pads are both connected to the second dual-axis sensitive gate.

[0016] Further defined, the first sensitive grid of the dual-axis is located on one side of the second sensitive grid of the dual-axis, and the first sensitive grid of the dual-axis and the second sensitive grid of the dual-axis are arranged in the same direction.

[0017] Further defined, the first sensitive grid of the dual-axis is located on one side of the second sensitive grid of the dual-axis, and the included angle between the first sensitive grid of the dual-axis and the second sensitive grid of the dual-axis is 90°.

[0018] Furthermore, the angle between the dual-axis first sensitive gate and the dual-axis second sensitive gate and the horizontal direction is 45°.

[0019] An application of a strain gauge for a large impact sensor as described above in a large impact sensor.

[0020] The beneficial effects of this utility model are as follows:

[0021] 1. By rounding the corners of the solder pads, this utility model can reduce stress concentration in strain gauges used in large impact sensors when subjected to large impacts, thereby dispersing stress, reducing the probability of damage to strain gauges used in large impact sensors, and improving their reliability.

[0022] 2. This utility model increases the adhesion between the capping film and the sensitive gate, and between the pad and the substrate by covering the sensitive gate and the pad with a capping film, thereby further improving the reliability of the strain gauge under large impact. Attached Figure Description

[0023] Figure 1 This is a structural diagram of a strain gauge for a large impact sensor as described in Embodiment 1 of this utility model;

[0024] Figure 2 This is a structural diagram of a strain gauge for a large impact sensor as described in Embodiment 2 of this utility model;

[0025] Figure 3 This is a structural diagram of a strain gauge for a large impact sensor as described in Embodiment 3 of this utility model;

[0026] Figure 4 This is a structural diagram of a strain gauge for a large impact sensor as described in Embodiment 4 of this utility model;

[0027] Figure 5 This is a structural diagram of a strain gauge for a large impact sensor as described in Embodiment 5 of this utility model;

[0028] Figure 6 This is a structural diagram of a strain gauge for a large impact sensor as described in Embodiment 6 of this utility model;

[0029] In the figure, 10-substrate; 20-sensitive gate; 21-first dual-axis sensitive gate; 22-second dual-axis sensitive gate; 30-pad; 31-first dual-axis pad; 32-second dual-axis pad; 33-third dual-axis pad; 34-fourth dual-axis pad. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0031] 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 claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0032] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0033] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the utility model. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] This utility model provides a strain gauge for a large impact sensor, including a substrate 10, a sensitive grid 20, and a pad 30. The sensitive grid 20 and the pad 30 are both covered on the substrate 10. The pad 30 is connected to the sensitive grid 20. The adjacent end faces of the pad 30 are transitioned by rounded corners, that is, the four corner positions around the pad 30 are rounded. This can reduce stress concentration of the strain gauge when subjected to a large impact, achieve stress dispersion, reduce the probability of damage to the strain gauge, and improve its reliability.

[0036] The fillet radius should be no less than R0.3, and can be selected as R0.3~R0.5.

[0037] Preferably, a capping film is applied to both the sensitive grid 20 and the pad 30. The capping film is preferably applied to both the sensitive grid 20 and the pad 30 simultaneously. This reduces the difficulty of applying multiple capping films, minimizes splicing, and ensures the quality of the coverage. By applying the capping film, the adhesion between the capping film and the sensitive grid, and between the pad and the substrate, is increased, further improving the reliability of the strain gauge under large impacts.

[0038] Since the pad 30 has wiring holes, the cover film at the wiring hole location needs to be removed after the cover film is applied so that the cover film is located around the wiring hole.

[0039] Example 1

[0040] The strain gauge used for the large impact sensor provided in this embodiment is a uniaxial strain gauge.

[0041] Correspondingly, there are two pads 30 and one sensitive gate 20, and both pads 30 are connected to the sensitive gate 20.

[0042] refer to Figure 1 In accordance with the principle of maximizing the number of strain gauges within a given area to reduce costs, the two pads 30 are positioned on the same side of the sensitive gate 20, preferably along the width of the sensitive gate 20.

[0043] Example 2

[0044] Based on Embodiment 1, the difference from Embodiment 1 is that the two pads 30 are disposed on opposite sides of the sensitive gate 20, for example, they can be disposed on opposite sides of the substrate 10 in the length direction; this can increase the number of strain gauges within a certain area.

[0045] To reduce the size of the pad 30, it is preferable that the angle between the sensitive gate 20 and the axis of symmetry in the length direction of the substrate 10 is 45°.

[0046] Example 3

[0047] The strain gauge used for the large impact sensor provided in this embodiment is a biaxial strain gauge.

[0048] Correspondingly, there are two sensitive gates 20 and three pads 30.

[0049] refer to Figure 3 Specifically, the sensitive gate 20 includes a dual-axis first sensitive gate 21 and a dual-axis second sensitive gate 22, and the pad 30 includes a dual-axis first pad 31, a dual-axis second pad 32 and a dual-axis third pad 33.

[0050] The first sensitive grid 21 of the dual axis is located on one side of the second sensitive grid 22 of the dual axis, and the angle between the first sensitive grid 21 of the dual axis and the second sensitive grid 22 of the dual axis is 90°.

[0051] Preferably, the dual-axis first sensitive grid 21 and the dual-axis second sensitive grid 22 are symmetrically arranged about the axis of symmetry of the substrate 10 along its length. Therefore, the angle between the dual-axis first sensitive grid 21 and the dual-axis second sensitive grid 22 and the axis of symmetry of the substrate 10 along its length is 45°, which facilitates the acquisition of shear stress in two directions.

[0052] The dual-axis third pad 33 is located between the dual-axis first sensitive gate 21 and the dual-axis second sensitive gate 22. The dual-axis third pad 33 is connected to one end of the dual-axis first sensitive gate 21 and one end of the dual-axis second sensitive gate 22, respectively. The dual-axis first pad 31 is connected to the other end of the dual-axis first sensitive gate 21, and the dual-axis second pad 32 is connected to the other end of the dual-axis second sensitive gate 22.

[0053] Example 4

[0054] The strain gauge for the large impact sensor provided in this embodiment is a biaxial strain gauge. Unlike embodiment 3, this embodiment provides two sensitive grids 20 and four pads 30.

[0055] refer to Figure 4 The sensitive gate 20 includes a dual-axis first sensitive gate 21 and a dual-axis second sensitive gate 22, and the pad 30 includes a dual-axis first pad 31, a dual-axis second pad 32, a dual-axis third pad 33, and a dual-axis fourth pad 34.

[0056] The dual-axis first pad 31 and the dual-axis second pad 32 are both connected to the dual-axis first sensitive gate 21, and the dual-axis third pad 33 and the dual-axis fourth pad 34 are both connected to the dual-axis second sensitive gate 22.

[0057] The first sensitive grid 21 of the dual axis is located on one side of the second sensitive grid 22 of the dual axis. The first sensitive grid 21 of the dual axis and the second sensitive grid 22 of the dual axis are arranged in the same direction. Preferably, the first sensitive grid 21 of the dual axis and the second sensitive grid 22 of the dual axis are arranged symmetrically about the axis of symmetry about the width direction of the substrate 10.

[0058] At this time, it is preferred that the dual-axis first pad 31 and the dual-axis second pad 32 are located on the same side, the dual-axis third pad 33 and the dual-axis fourth pad 34 are located on the same side, and the dual-axis second pad 32 and the dual-axis third pad 33 are located on the same side.

[0059] Example 5

[0060] Based on Embodiment 4, the difference between this embodiment and Embodiment 4 is that the included angle between the dual-axis first sensitive gate 21 and the dual-axis second sensitive gate 22 is 90°.

[0061] refer to Figure 5 Preferably, the first dual-axis sensitive grid 21 is arranged in the transverse direction, and the second dual-axis sensitive grid 22 is arranged in the longitudinal direction, mainly for collecting stress in two directions.

[0062] At this time, the first dual-axis pad 31, the second dual-axis pad 32, the third dual-axis pad 33, and the fourth dual-axis pad 34 are all located on the same side.

[0063] Example 6

[0064] refer to Figure 6Based on Embodiment 5, the difference between this embodiment and Embodiment 4 is that the dual-axis first sensitive gate 21 and the dual-axis second sensitive gate 22 are symmetrically arranged about the axis of symmetry of the substrate 10 in the length direction. Therefore, the angle between the dual-axis first sensitive gate 21 and the dual-axis second sensitive gate 22 and the axis of symmetry of the substrate 10 in the length direction is 45°.

[0065] At this time, the first dual-axis sensitive gate 21 is located between the first dual-axis pad 31 and the second dual-axis pad 32, and the second dual-axis sensitive gate 22 is located between the third dual-axis pad 33 and the fourth dual-axis pad 34 to collect shear stress in two directions.

[0066] The advantages of this utility model are: the strain gauge for large impact sensors described in any one of the embodiments 1 to 6 has the advantages of high measurement accuracy, impact resistance and high reliability, and can be applied to large impact sensors.

[0067] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this utility model.

[0068] Although the present invention has been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these inventions without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A strain gauge for a large impact sensor, characterized in that, It includes a substrate (10), a sensitive gate (20) and a pad (30), both of which cover the substrate (10). The pad (30) is connected to the sensitive gate (20), and the adjacent side faces of the pad (30) are transitioned by rounded corners.

2. The strain gauge for a large impact sensor according to claim 1, characterized in that, The radius of the fillet is not less than 0.3mm.

3. The strain gauge for a large impact sensor according to claim 2, characterized in that, The radius of the fillet is 0.3mm to 0.5mm.

4. The strain gauge for a large impact sensor according to claim 2, characterized in that, Both the sensitive gate (20) and the pad (30) are covered with a capping film. The pad (30) has a wiring hole, and the capping film is located around the wiring hole.

5. The strain gauge for a large impact sensor according to claim 4, characterized in that, The number of pads (30) is two, and both pads (30) are connected to the sensitive gate (20). The two pads (30) are located on the same side of the sensitive gate (20) or on opposite sides of the sensitive gate (20).

6. The strain gauge for a large impact sensor according to claim 4, characterized in that, The sensitive gate (20) includes a dual-axis first sensitive gate (21) and a dual-axis second sensitive gate (22), and the pad (30) includes a dual-axis first pad (31), a dual-axis second pad (32), and a dual-axis third pad (33). The first dual-axis sensitive gate (21) is located on one side of the second dual-axis sensitive gate (22), and the angle between the first dual-axis sensitive gate (21) and the second dual-axis sensitive gate (22) is 90°. The third dual-axis pad (33) is located between the first dual-axis sensitive gate (21) and the second dual-axis sensitive gate (22). The third dual-axis pad (33) is connected to one end of the first dual-axis sensitive gate (21) and one end of the second dual-axis sensitive gate (22), respectively. The first dual-axis pad (31) is connected to the other end of the first dual-axis sensitive gate (21), and the second dual-axis pad (32) is connected to the other end of the second dual-axis sensitive gate (22).

7. The strain gauge for a large impact sensor according to claim 4, characterized in that, The sensitive gate (20) includes a dual-axis first sensitive gate (21) and a dual-axis second sensitive gate (22), and the pad (30) includes a dual-axis first pad (31), a dual-axis second pad (32), a dual-axis third pad (33), and a dual-axis fourth pad (34). The first dual-axis pad (31) and the second dual-axis pad (32) are both connected to the first dual-axis sensitive gate (21), and the third dual-axis pad (33) and the fourth dual-axis pad (34) are both connected to the second dual-axis sensitive gate (22).

8. The strain gauge for a large impact sensor according to claim 7, characterized in that, The first sensitive grid (21) of the dual axis is located on one side of the second sensitive grid (22) of the dual axis, and the first sensitive grid (21) of the dual axis and the second sensitive grid (22) of the dual axis are arranged in the same direction.

9. The strain gauge for a large impact sensor according to claim 7, characterized in that, The first sensitive grid (21) of the dual axis is located on one side of the second sensitive grid (22) of the dual axis, and the included angle between the first sensitive grid (21) of the dual axis and the second sensitive grid (22) of the dual axis is 90°.

10. The strain gauge for a large impact sensor according to claim 6 or 9, characterized in that, The angle between the dual-axis first sensitive gate (21) and the dual-axis second sensitive gate (22) and the horizontal direction is 45°.

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