A micro-strain sensor

Abstract

The application discloses a micro-strain sensor and belongs to the technical field of sensors.The micro-strain sensor comprises a sensor body and a support, the support is provided with the sensor body and a first horizontal plate, the first horizontal plate is provided with a first connecting rod slidably connected with the first horizontal plate at both ends, is provided with a second connecting rod slidably connected with the first horizontal plate in the middle, and is provided with a sliding groove on the side away from the sensor body, one end of the first connecting rod close to the sensor body is provided with a first spring, one end of the second connecting rod away from the sensor body is provided with a second spring, the sliding groove is provided with a sliding block slidably connected with the sliding groove, a third connecting rod is arranged between the sliding block and the second connecting rod, the third connecting rod is rotatably connected with the second connecting rod and the sliding block at both ends respectively, and the sliding block is provided with a first fixing block, the first connecting rod is provided with a second fixing block matched with the first fixing block, and the device provides overload protection for the micro-strain sensor when micro-strain is measured.

Description

Technical Field

[0001] This invention relates to the field of sensor technology, and more specifically to a micro-strain sensor. Background Technology

[0002] When measuring the strain generated by the deformation of an object under force, strain sensors are generally used. When it is necessary to measure micro-scale forces, the common methods are to reduce the stiffness of the strain core region to make the measurement of the strain core region more sensitive, or to design a structure to amplify the force to be measured in order to facilitate measurement.

[0003] Due to the high sensitivity of micro-strain sensors, reducing the stiffness of the strain core region or designing a structure to amplify the force to be measured can easily exceed the sensor's measurement range, causing overload damage to the sensor. Summary of the Invention

[0004] In view of the above-mentioned technical deficiencies, the purpose of this invention is to provide a micro-strain sensor to protect highly sensitive micro-strain sensors.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The present invention provides a sensor body and a bracket, wherein the bracket is provided with a sensor body and a first horizontal plate, the first horizontal plate has first connecting rods slidably connected to both ends of the first horizontal plate, a second connecting rod slidably connected to the first horizontal plate in the middle, a sliding groove is provided on the side away from the sensor body, a first spring is sleeved on the end of the first connecting rod near the sensor body, a second spring is sleeved on the end of the second connecting rod away from the sensor body, a slider is provided on the sliding groove and slidably connected to the sliding groove, a third connecting rod is provided between the slider and the second connecting rod, the two ends of the third connecting rod are rotatably connected to the second connecting rod and the slider respectively, a first fixing block is provided on the slider, and a second fixing block is provided on the first connecting rod to cooperate with the first fixing block.

[0006] Preferably, the ends of the first and second links furthest from the sensor body are both slidably connected to the bracket.

[0007] Preferably, the end of the second connecting rod near the sensor body is provided with an elastic element, and the end away from the sensor body is provided with an adjusting block. The end of the second connecting rod passing through the bracket is rotatably connected to the adjusting block.

[0008] Preferably, the sensor includes a support portion and a pressure-bearing portion, with a strain core region located between the support portion and the pressure-bearing portion.

[0009] Preferably, the first fixed block and the slider are rotatably connected, and a first torsion spring is provided between the first fixed block and the slider.

[0010] Preferably, the first connecting rod has a first rectangular groove at the end away from the sensor body, the bracket has a support, the support has a fourth connecting rod rotatably connected to the support, the fourth connecting rod has a driving block that cooperates with the first rectangular groove at the end near the first rectangular groove, the driving block is rotatably connected to the fourth connecting rod, and a second torsion spring is provided between the driving block and the fourth connecting rod.

[0011] Preferably, the bracket is provided with a second rectangular groove that penetrates the side wall of the bracket, and the end of the fourth connecting rod away from the first rectangular groove is located in the second rectangular groove.

[0012] The beneficial effects of this invention are as follows: 1. When measuring micro-strain, this device provides overload protection for the micro-strain sensor. When the micro-strain sensor reaches its measurement limit, the first connecting rod and the first spring on the support can quickly protect the sensor body, preventing damage caused by the sensor body reaching its measurement limit; 2. The elastic device on the support does not directly contact the sensor body and does not affect the measurement process of the sensor body; 3. This device avoids deformation and damage to the sensor body caused by the squeezing of the sensor body and the rigid support device; 4. This device has a simple structure, protects the sensor body through a simple mechanical structure, and has a fast response. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the overall structure of a micro-strain sensor according to the present invention.

[0015] Figure 2 This is a front sectional view of the overall structure of a micro-strain sensor according to the present invention.

[0016] Figure 3 This is a side sectional view of the overall structure of a micro-strain sensor according to the present invention.

[0017] Figure 4 This is a top view of the overall structure of a micro-strain sensor according to the present invention.

[0018] Figure 5 for Figure 2 Enlarged view of point A in the middle.

[0019] Explanation of reference numerals in the attached drawings: Sensor body 1; Support 2; First horizontal plate 3; First connecting rod 4; Second connecting rod 5; Slide groove 6; Slider 7; Third connecting rod 8; First fixing block 9; Second fixing block 10; First spring 11; Second spring 12; Adjusting block 13; Elastic element 14; First rectangular groove 15; Second rectangular groove 16; Support 17; Fourth connecting rod 18; Drive block 19; Inclined surface 20; Support part 21; Pressure-bearing part 22; Strain core area 23; First torsion spring 24; Second torsion spring 25. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example: Figures 1 to 5As shown, this invention provides a micro-strain sensor, including a sensor body 1 and a support 2. The support 2 has the sensor body 1 and a first horizontal plate 3 mounted on it. The sensor body 1 reacts to the weight of the object being measured by deformation. The support 2 provides support for the sensor body 1. In actual use, the support 2 is fixed to a rigid support device pre-installed under the sensor body 1. The first horizontal plate 3 has first connecting rods 4 slidably connected to both ends of the first horizontal plate 3, and a second connecting rod 5 slidably connected to the first horizontal plate 3 in the middle. A groove 6 is provided on the side away from the sensor body 1. A first spring 11 is sleeved on the end of the first connecting rod 4 near the sensor body 1, and the first spring 11 changes the length of the first connecting rod 4 near the sensor body 1. A second spring 12 is sleeved on the end of the second connecting rod 5 away from the sensor body 1. A slider 7 is slidably connected to the groove 6. A third connecting rod 8 is provided between the slider 7 and the second connecting rod 5. The two ends of the third connecting rod 8 are rotatably connected to the second connecting rod 5 and the slider 7, respectively. The second connecting rod 5 is rotatably connected to the first connecting rod 6. A horizontal plate 3 slides, causing the third connecting rod 8 to rotate. A first fixing block 9 is provided on the slider 7. A second fixing block 10 is provided on the first connecting rod 4, which cooperates with the first fixing block 9. The cooperation of the first fixing block 9 and the second fixing block 10 changes the length of the first connecting rod 4 relative to the sensor body 1, thus fixing the first connecting rod 4. The second spring 12 fixes the first fixing block 9 and the second fixing block 10 relative to each other, so the second connecting rod 5 does not slide. The bracket 2 cooperates with the first connecting rod 4. There is a gap between the first connecting rod 4 and the sensor body 1, so they do not directly contact each other and do not affect the use of the sensor body 1. On the other hand, it can prevent the sensor body 1 from directly contacting the rigid support device set below to prevent the sensor body 1 from continuing to deform when overloaded. It avoids the collision between the sensor body 1 and the rigid support device, which would damage the sensor body 1. At the same time, it also avoids the sensor body 1 from deforming due to the compression of the measuring part and the rigid support device, which would cause measurement errors.

[0022] Furthermore, the ends of the first link 4 and the second link 5 that are away from the sensor body 1 are slidably connected to the bracket 2, and the ends of the first link 4 and the second link 5 that are away from the sensor body 1 can pass through the bracket 2.

[0023] Furthermore, the second connecting rod 5 has an elastic element 14 at the end near the sensor body 1 and an adjusting block 13 at the end away from the sensor body 1. The end of the second connecting rod 5 passing through the bracket 2 is rotatably connected to the adjusting block 13. The adjusting block 13 adjusts the relative distance between the second connecting rod 5 and the sensor body 1. The adjusting block 13 is threadedly connected to the end of the second connecting rod 5 away from the sensor body 1. When the adjusting block 13 rotates, the second connecting rod moves closer to or further away from the sensor body 1, which facilitates adjustment to the optimal measurement range of the sensor body 1. The elastic element 14 at the end of the second connecting rod 5 near the sensor body 1 can be made of rubber or silicone. The elastic element 14 is a soft material, which can prevent rigid impact damage to the sensor body 1 when in contact with it.

[0024] Furthermore, the sensor body 1 includes a support part 21 and a pressure-bearing part 22. A strain core region 23 is provided between the support part 21 and the pressure-bearing part 22. A strain gauge is disposed on the strain core region 23. The stiffness of the strain core region 23 is lower than that of the support part 21 and the pressure-bearing part 22, which can more sensitively measure deformation, so as to measure minute deformation. The bracket 2 is disposed on the support part 21. The bracket 2 works with the support part 21 to make the measurement more sensitive.

[0025] Furthermore, the first fixing block 9 is rotatably connected to the slider 7, and a first torsion spring 24 (not shown in the figure) is provided between the first fixing block 9 and the slider 7.

[0026] Furthermore, the end of the first connecting rod 4 furthest from the sensor body 1 is provided with a first rectangular groove 15. A support 17 is provided on the bracket 2, and a fourth connecting rod 18 is rotatably connected to the support 17. A driving block 19, which mates with the first rectangular groove 15, is provided at the end of the fourth connecting rod 18 closest to it. The driving block 19 is rotatably connected to the fourth connecting rod 18. A second torsion spring 25 (shown in the figure) is provided between the driving block 19 and the fourth connecting rod 18. Rotation of the fourth connecting rod 18 causes the driving block 19 to rotate, which in turn causes the first connecting rod 4 to slide relative to the first horizontal plate 3 through the first rectangular groove 15. When the fourth connecting rod 18 rotates, it causes the driving block 19 to rotate. The drive block 19 and the support 17 are circular and rotate. The drive block 19 moves away from the first rectangular groove 15, enters the first rectangular groove 15, and drives the first connecting rod 4 to slide. Then it moves away from the first rectangular groove 15 a second time. When the drive block 19 moves away from the first rectangular groove 15 for the second time, the fourth connecting rod 18 cannot return to its original state due to the obstruction of the outer shell of the first rectangular groove 15. A second torsion spring is provided between the drive block 19 and the fourth connecting rod 18. When the fourth connecting rod 18 cannot return to its original state, the drive block 19 is squeezed by the outer shell of the first rectangular groove 15, which can squeeze the second torsion spring to make the drive block 19 rotate relative to the fourth connecting rod 18, so that the fourth connecting rod 18 returns to its original state.

[0027] Furthermore, the bracket 2 is provided with a second rectangular groove 16 that penetrates the side wall of the bracket 2. The end of the fourth connecting rod 18 away from the first rectangular groove 15 is located in the second rectangular groove 16. The fourth connecting rod 18 can be adjusted outside the bracket 2, thereby adjusting the length of the first connecting rod 4 relative to the sensor body 1. A third spring 23 is provided on the top surface of the bracket 2 near the end of the second rectangular groove 16. The third spring 23 causes the fourth connecting rod 18 to return to its original state.

[0028] Furthermore, the first fixing block 9 and the second fixing block 10 are provided with mutually cooperating inclined surfaces 20. The first fixing block 9 and the second fixing block 10 are centrally symmetrically arranged (shown as two identical right-angled triangular blocks). When the horizontal surfaces of the first fixing block 9 and the second fixing block 10 are close to each other, it is convenient to fix the position of the first connecting rod 4. When the inclined surfaces 20 of the first fixing block 9 and the second fixing block 10 are close to each other, the first fixing block 9 and the second fixing block 10 slide relative to each other, and the position of the first connecting rod 4 cannot be fixed. A first torsion spring is provided between the first fixing block 9 and the slider 7. When the inclined surfaces 20 of the first fixing block 9 and the second fixing block 10 are close to each other, the first fixing block 9 is squeezed by the second fixing block 10, the first torsion spring is squeezed, the first fixing block 9 rotates, and the first connecting rod 4 cannot be fixed.

[0029] In use, the sensor body 1 is attached to the measuring device, and the bracket 2 is installed directly below the sensor body 1. The adjusting block 13 is rotated to adjust the relative distance between the second connecting rod 5 and the sensor body 1, so that the sensor body 1 can compress the elastic element 14 before reaching the upper limit of measurement, raising the fourth connecting rod 18. This causes the first connecting rod 4 to slide downwards until the end of the first connecting rod 4 near the sensor body 1 is slightly lower than the elastic element 14. At this time, the first spring 11 is compressed, and the second fixing block 10 slides with the first connecting rod 4. The inclined surfaces 20 of the first fixing block 9 and the second fixing block 10 approach and intersect, causing the first torsion spring to deform. The first fixing block 9 rotates, and simultaneously the slider 7 slides. The slider 7 drives the second connecting rod 5 to slide via the third connecting rod 8. Subsequently, the fixing blocks 9 and 10 are misaligned, the first torsion spring returns to its original position, and the horizontal surfaces of the first fixing blocks 9 and 10 contact each other. The relative position of the first connecting rod 4 and the bracket 2 is fixed. At this time, the first connecting rod 4 does not contact the measuring device attached to the sensor body 1. When the measuring device deforms due to the object being measured, the sensor body 1 simultaneously… When deformation occurs, and the sensor body 1 reaches the critical value of the measurement range, the sensor body 1 presses down on the elastic element 14 of the second connecting rod 5, causing the second connecting rod 5 to slide and drive the third connecting rod 8 to rotate. The sliders 7 slide closer to each other, and the first fixed block 9 moves away from the second fixed block 10. The first connecting rod 4 immediately releases its restriction, and the first spring 11 recovers its deformation, causing the first connecting rod 4 to slide relative to the bracket 2. The first connecting rod 4 contacts the part of the measuring device that is not in contact with the sensor body 1. The first connecting rod 4, together with the first spring 11, provides support for the measuring device. At this time, the deformation of the sensor body 1 under the measuring device is reduced, which can prevent the sensor body 1 from being overloaded. If the sensor body 1 is connected to an external display module at this time, the measured value on the display module will suddenly change from large to small, thus indicating that the sensor body 1 is overloaded. When no weight is being measured, the first spring 11 is not compressed, and the first connecting rod 4 contacts the measuring device, providing support for the measuring device. This can prevent accidental contact with the measuring device from causing deformation of the sensor body 1, which would cause the sensor body 1 to be in a working state for a long time and suffer fatigue damage.

[0030] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A micro-strain sensor, characterized in that, The device includes a sensor body (1) and a bracket (2). The bracket (2) is provided with the sensor body (1) and a first horizontal plate (3). The first horizontal plate (3) has a first connecting rod (4) at both ends that can be slidably connected to the first horizontal plate (3), and a second connecting rod (5) in the middle that can be slidably connected to the first horizontal plate (3). A sliding groove (6) is provided on the side away from the sensor body (1). A first spring (11) is sleeved on the end of the first connecting rod (4) near the sensor body (1), and a second spring (12) is sleeved on the end of the second connecting rod (5) away from the sensor body (1). A slider (7) is provided on the sliding groove (6) that can be slidably connected to the sliding groove (6). A third connecting rod (8) is provided between the slider (7) and the second connecting rod (5). The two ends of the third connecting rod (8) are rotatably connected to the second connecting rod (5) and the slider (7) respectively. A first fixing block (9) is provided on the slider (7). A second fixing block (10) that cooperates with the first fixing block (9) is provided on the first connecting rod (4).

2. A micro-strain sensor as described in claim 1, characterized in that, The ends of the first link (4) and the second link (5) that are away from the sensor body (1) are slidably connected to the bracket (2).

3. A micro-strain sensor as described in claim 2, characterized in that, The second connecting rod (5) has an elastic element (14) at one end near the sensor body (1) and an adjusting block (13) at the other end away from the sensor body (1). The end of the second connecting rod (5) passing through the bracket (2) is rotatably connected to the adjusting block (13).

4. A micro-strain sensor as described in claim 3, characterized in that, The sensor body (1) includes a support part (21) and a pressure-bearing part (22), and a strain core area (23) is provided between the support part (21) and the pressure-bearing part (22).

5. A micro-strain sensor as described in claim 1, characterized in that, The first fixing block (9) is rotatably connected to the slider (7), and a first torsion spring is provided between the first fixing block (9) and the slider (7).

6. A micro-strain sensor as described in claim 1, characterized in that, The first connecting rod (4) has a first rectangular groove (15) at the end away from the sensor body (1). The bracket (2) has a support (17). The support (17) has a fourth connecting rod (18) that is rotatably connected to the support (17). The fourth connecting rod (18) has a driving block (19) that cooperates with the first rectangular groove (15) at the end near the first rectangular groove (15). The driving block (19) is rotatably connected to the fourth connecting rod (18). A second torsion spring is provided between the driving block (19) and the fourth connecting rod (18).

7. A micro-strain sensor as described in claim 6, characterized in that, The bracket (2) is provided with a second rectangular groove (16) that penetrates the side wall of the bracket (2), and the end of the fourth connecting rod (18) away from the first rectangular groove (15) is located in the second rectangular groove (16).

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