Resistance type strain gauge with strong adaptability

Abstract

The invention relates to the technical field of strain gauges, in particular to a high-adaptability resistance type strain gauge which comprises a circular base and a circular shell. A circular test plate is fixedly arranged on the circular shell; the circular test plate is arranged above the substrate; the top of the circular test board is provided with a longitudinal sensitive grid and a transverse sensitive grid; a test hole penetrates through the circular test plate; the circular base is provided with an accommodating groove; the longitudinal sensitive grids and the transverse sensitive grids are provided with floating pins, and the circular test board is provided with a first rubber bottom layer. Strain data in the horizontal direction and the vertical direction are obtained in the initial measurement process, the stress direction can be accurately calculated, the installation direction of the strain gauge is further adjusted, the measurement direction of one sensitive grid is made to be consistent with the direction of the actual dependent variable, errors caused by angle mismatching are reduced, and the measurement accuracy is improved. According to the design, the direction limitation of a traditional strain gauge can be avoided, the measurement precision can be improved, and high accuracy can be kept in a dynamically changing environment.

Description

Technical Field

[0001] The invention relates to the technical field of strain gauges, and in particular to a resistance strain gauge with strong adaptability. Background Art

[0002] Traditional resistive strain gauges usually rely on strain measurement in a single direction, that is, the direction of its sensitive grid is consistent with the strain direction of the object to be measured. However, in practical applications, the direction of the force may change, resulting in the inability of traditional strain gauges to accurately measure the effects of multi-directional stress. In order to meet this challenge, it is often necessary to use multiple strain gauges or complex sensor arrays to comprehensively measure strains in different directions, which not only increases costs and design complexity in some applications, but may also lead to inconsistencies or errors in measurement results. Summary of the invention

[0003] The object of the present invention is to provide a resistance strain gauge with strong adaptability in view of the above-mentioned deficiencies in the prior art.

[0004] The object of the present invention is achieved by the following technical scheme: a highly adaptable resistance strain gauge, comprising a circular base and a circular shell rotatably connected to the circular base; the circular shell is fixedly provided with a circular test plate; the circular base, the circular shell and the circular test plate are arranged concentrically; the circular test plate is arranged above the base;

[0005] A longitudinal sensitive grid and a transverse sensitive grid are arranged on the top of the circular test plate; the longitudinal sensitive grid and the transverse sensitive grid are arranged vertically;

[0006] The circular test plate is provided with a test hole through it; the top of the circular base is provided with a receiving groove; the longitudinal sensitive grid and the transverse sensitive grid are both provided with floating pins; the floating pin passes through the test hole and is arranged in the receiving groove; the bottom of the circular test plate is provided with a first adhesive layer.

[0007] The present invention is further configured such that a rotating groove is provided at the center of the top of the circular base; a rotating column is provided at the center of the bottom of the circular shell; and the rotating column is rotatably connected to the rotating groove after passing through the circular test plate.

[0008] The present invention is further configured such that a longitudinal lead is passed through the circular housing; and the longitudinal lead is connected to the longitudinal sensitive grid.

[0009] The present invention is further configured such that the circular housing is penetrated by a transverse lead; the transverse lead is connected to a transverse sensitive grid.

[0010] The present invention is further configured such that the bottom of the longitudinal sensitive grid and the bottom of the transverse sensitive grid are both provided with floating grooves; and the floating pins are telescopically arranged in the floating grooves.

[0011] The present invention is further configured such that a floating spring is provided between the inner wall of the floating groove and the top of the floating pin.

[0012] The present invention is further configured such that a handle is provided on the side wall of the circular test plate; and a calibration block is provided on the side wall of the circular base.

[0013] The present invention is further configured such that a second adhesive layer is provided at the bottom of the circular base.

[0014] The present invention is further configured such that the longitudinal sensitive fence and the transverse sensitive fence both include long connecting rods and short connecting rods which are alternately connected in sequence; and a floating pin is provided in the middle of the short connecting rod.

[0015] The present invention is further configured such that a through hole is penetrated through the first adhesive layer; and the floating pin is passed through the through hole.

[0016] Beneficial effects of the present invention: The present invention can accurately infer the force direction by obtaining strain data in the horizontal and vertical directions during the initial measurement process, and further adjust the installation direction of the strain gauge so that the measurement direction of one of the sensitive grids is consistent with the direction of the actual strain amount, thereby reducing the error caused by angle mismatch. This design can not only avoid the directional limitation of traditional strain gauges, but also improve the measurement accuracy, ensuring high accuracy even in a dynamically changing environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The invention is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the invention. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0018] Figure 1 It is a schematic diagram of the structure of the present invention;

[0019] Figure 2 It is a structural schematic diagram of another perspective of the present invention;

[0020] Figure 3 is a structural exploded view of the present invention;

[0021] Figure 4 It is a structural exploded view of another perspective of the present invention;

[0022] Figure 5 It is a structural schematic diagram of a circular test plate of the present invention;

[0023] Figure 6 is a structural schematic diagram of the circular test plate of the present invention from another viewing angle;

[0024] Figure 7 is a cross-sectional view of the first adhesive layer of the present invention when it is separated from the circular base;

[0025] Figure 8 is a cross-sectional view of the first adhesive base layer of the present invention when it is attached to the circular base;

[0026] Among them: 1. circular base; 11. accommodating groove; 12. rotating groove; 13. calibration block; 2. circular shell; 21. rotating column; 3. circular test plate; 31. test hole; 32. handle; 4. longitudinal sensitive grid; 41. longitudinal lead; 5. transverse sensitive grid; 51. transverse lead; 61. floating pin; 62. floating groove; 63. floating spring; 7. first glue bottom layer; 71. through hole; 8. second glue bottom layer; 91. long connecting rod; 92. short connecting rod. DETAILED DESCRIPTION

[0027] The present invention is further described in conjunction with the following examples.

[0028] Depend on Figures 1 to 8 It can be seen that the adaptable resistance strain gauge described in this embodiment includes a circular base 1 and a circular housing 2 rotatably connected to the circular base 1; the circular housing 2 is fixed with a circular test plate 3; the circular base 1, the circular housing 2 and the circular test plate 3 are arranged concentrically; the circular test plate 3 is arranged above the base;

[0029] A longitudinal sensitive grid 4 and a transverse sensitive grid 5 are provided on the top of the circular test plate 3; the longitudinal sensitive grid 4 and the transverse sensitive grid 5 are arranged vertically;

[0030] The circular test plate 3 is penetrated by a test hole 31; the top of the circular base 1 is provided with a receiving groove 11; the longitudinal sensitive grid 4 and the transverse sensitive grid 5 are both provided with a floating pin 61; the floating pin 61 passes through the test hole 31 and is arranged in the receiving groove 11; the bottom of the circular test plate 3 is provided with a first adhesive layer 7.

[0031] Specifically, when the highly adaptable resistive strain gauge described in this embodiment is in use, the floating pin 61 passes through the test hole 31 and is disposed in the accommodating groove 11. At this time, there is a gap between the first adhesive layer 7 and the top surface of the circular base 1, and the first adhesive layer 7 does not contact the circular base 1.

[0032] First, the circular base 1 is fixed on the object to be tested. When the surface of the object to be tested is deformed, the circular base 1 transmits the strain force to the longitudinal sensitive grid 4 and the transverse sensitive grid 5 through the cooperation of the accommodating groove 11 and the floating pin 61. The longitudinal sensitive grid 4 and the transverse sensitive grid 5 respectively obtain the vertical component and the horizontal component of the strain force. According to the magnitude of the vertical component and the magnitude of the horizontal component, the actual direction of the strain force can be calculated.

[0033] Then the circular shell 2 is moved upward, so that the circular test plate 3, the longitudinal sensitive grid 4, the transverse sensitive grid 5, the first adhesive layer 7 and the floating pin 61 are all moved upward, so that the floating pin 61 withdraws from the accommodating groove 11; then the circular shell 2 is rotated according to the actual direction of the strain force, so that the longitudinal sensitive grid 4 is parallel to the direction of the strain force, or the transverse sensitive grid 5 is parallel to the direction of the strain force, and then the circular shell 2 is moved downward. At this time, the floating pin 61 abuts against the top surface of the circular base 1, that is, the floating pin 61 can be retracted into the longitudinal sensitive grid 4 and the transverse sensitive grid 5, so that the first adhesive layer 7 contacts the circular base 1, and the circular base 1 and the circular test plate 3 are firmly connected through the first adhesive layer 7, so that the strain force caused by the deformation of the surface of the object to be tested can be accurately transmitted to the circular test plate 3 through the circular base 1. At this time, the strain of the object to be tested can be measured through the sensitive grid parallel to the direction of the strain force.

[0034] This embodiment can accurately infer the force direction by obtaining strain data in the horizontal and vertical directions during the initial measurement process, and further adjust the installation direction of the strain gauge so that the measurement direction of one of the sensitive grids is consistent with the direction of the actual strain amount, thereby reducing the error caused by angle mismatch. This design can not only avoid the directional limitation of traditional strain gauges, but also improve the measurement accuracy, ensuring high accuracy even in a dynamically changing environment.

[0035] In the embodiment of the invention, a resistance strain gauge with strong adaptability is provided with a rotation groove 12 at the center of the top of the circular base 1; a rotation column 21 is provided at the center of the bottom of the circular housing 2; the rotation column 21 passes through the circular test plate 3 and is rotationally connected to the rotation groove 12. Specifically, the above arrangement enables the circular housing 2 to rotate stably.

[0036] In the embodiment of the invention, a highly adaptable resistance strain gauge is provided with a longitudinal lead 41 through the circular housing 2; the longitudinal lead 41 is connected to the longitudinal sensitive grid 4. The above arrangement facilitates receiving the sensing data of the longitudinal sensitive grid 4, and can effectively export the sensing data of the longitudinal sensitive grid 4 to the circular housing 2.

[0037] In the embodiment of the invention, a highly adaptable resistance strain gauge is provided with a transverse lead 51 through the circular housing 2, and the transverse lead 51 is connected to the transverse sensitive grid 5. The above arrangement facilitates receiving the sensing data of the transverse sensitive grid 5, and can effectively export the sensing data of the transverse sensitive grid 5 to the circular housing 2.

[0038] In the embodiment of the invention, a highly adaptable resistance strain gauge is provided with a floating groove 62 at the bottom of the longitudinal sensitive grid 4 and the bottom of the transverse sensitive grid 5; the floating pin 61 is telescopically arranged in the floating groove 62. In the embodiment of the invention, a highly adaptable resistance strain gauge is provided with a floating spring 63 between the inner wall of the floating groove 62 and the top of the floating pin 61.

[0039] Specifically, through the above-mentioned arrangement, when in use, due to the action of the floating spring 63, the bottom of the floating pin 61 extends out of the floating groove 62, passes through the test hole 31 and is set in the accommodating groove 11. At this time, there is a gap between the first adhesive layer 7 and the top surface of the circular base 1, and the first adhesive layer 7 does not contact the circular base 1.

[0040] When the floating pin 61 abuts against the top surface of the circular base 1, the circular shell 2 moves downward, allowing the floating pin 61 to retract into the floating groove 62, so that the first adhesive layer 7 contacts the circular base 1, and the circular base 1 and the circular test plate 3 are firmly connected through the first adhesive layer 7.

[0041] In the embodiment of the invention, a resistive strain gauge with strong adaptability is provided with a handle 32 on the side wall of the circular test plate 3. The above arrangement facilitates the movement and rotation of the circular housing 2. A calibration block 13 is provided on the side wall of the circular base 1. The calibration block 13 and the handle 32 are provided to facilitate the user to observe the rotation angle of the circular housing 2.

[0042] In the embodiment of the invention, a highly adaptable resistance strain gauge is provided with a second adhesive layer 8 at the bottom of the circular base 1. The above arrangement facilitates a stable connection between the circular base 1 and the object to be measured.

[0043] In the embodiment of the invention, the resistive strain gauge with strong adaptability is described, wherein the longitudinal sensitive grid 4 and the transverse sensitive grid 5 each include a long connecting rod 91 and a short connecting rod 92 which are alternately connected in sequence; and a floating pin 61 is provided in the middle of the short connecting rod 92. Specifically, through the above arrangement, the strain force generated by the deformation of the measured object can be effectively transmitted to the longitudinal sensitive grid 4 and the transverse sensitive grid 5 during the initial measurement.

[0044] In the embodiment of the invention, the first adhesive layer 7 is provided with a through hole 71, and the floating pin 61 is passed through the through hole 71. Specifically, the area of ​​the first adhesive layer 7 can be increased as much as possible through the above arrangement, thereby enhancing the stability of the connection between the circular base 1 and the circular test plate 3.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A highly adaptable resistance strain gauge, characterized in that: The invention comprises a circular base (1) and a circular shell (2) rotatably connected to the circular base (1); a circular test plate (3) is fixedly provided on the circular shell (2); the circular base (1), the circular shell (2) and the circular test plate (3) are arranged cocentrically; and the circular test plate (3) is arranged above the base; A longitudinal sensitive grid (4) and a transverse sensitive grid (5) are provided on the top of the circular test plate (3); the longitudinal sensitive grid (4) and the transverse sensitive grid (5) are arranged vertically; The circular test plate (3) is provided with a test hole (31) running through it; the top of the circular base (1) is provided with a receiving groove (11); the longitudinal sensitive grid (4) and the transverse sensitive grid (5) are both provided with floating pins (61); the floating pins (61) pass through the test hole (31) and are arranged in the receiving groove (11); the bottom of the circular test plate (3) is provided with a first adhesive layer (7).

2. The highly adaptable resistive strain gauge according to claim 1, characterized in that: A rotating groove (12) is provided at the center of the top of the circular base (1); a rotating column (21) is provided at the center of the bottom of the circular shell (2); and the rotating column (21) passes through the circular test plate (3) and is rotatably connected to the rotating groove (12).

3. The highly adaptable resistance strain gauge according to claim 1, characterized in that: The circular housing (2) is provided with a longitudinal lead (41); the longitudinal lead (41) is connected to the longitudinal sensitive grid (4).

4. The highly adaptable resistance strain gauge according to claim 1, characterized in that: The circular housing (2) is provided with a transverse lead (51); the transverse lead (51) is connected to a transverse sensitive grid (5).

5. The highly adaptable resistance strain gauge according to claim 1, characterized in that: The bottom of the longitudinal sensitive grid (4) and the bottom of the transverse sensitive grid (5) are both provided with a floating groove (62); the floating pin (61) is telescopically arranged in the floating groove (62).

6. The highly adaptable resistance strain gauge according to claim 5, characterized in that: A floating spring (63) is provided between the inner wall of the floating groove (62) and the top of the floating pin (61).

7. The highly adaptable resistance strain gauge according to claim 1, characterized in that: The side wall of the circular test plate (3) is provided with a handle (32); the side wall of the circular base (1) is provided with a calibration block (13).

8. The highly adaptable resistance strain gauge according to claim 1, characterized in that: A second adhesive layer (8) is provided at the bottom of the circular base (1).

9. The highly adaptable resistive strain gauge according to claim 1, characterized in that: The longitudinal sensitive fence (4) and the transverse sensitive fence (5) both comprise long connecting rods (91) and short connecting rods (92) which are alternately connected in sequence; a floating pin (61) is provided in the middle of the short connecting rod (92).

10. The highly adaptable resistance strain gauge according to claim 1, characterized in that: The first adhesive layer (7) is penetrated by a through hole (71); the floating pin (61) is inserted into the through hole (71).

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