Structural strain measurement device and use method thereof

Abstract

The invention provides a structural strain measurement device and a use method thereof, and relates to the technical field of strain measurement, and the structural strain measurement device comprises a box body which comprises a first box body part and a second box body part; a first push-pull block; a first push-pull rod; a dial indicator; a second push-pull block; a second push-pull rod; and a lever. The use method of the structure strain measurement device comprises the following steps: placing the structure strain measurement device; recording the distance between the set fulcrum and the first end point, and obtaining a lever multiple based on the length of the lever; recording the initial reading of the dial indicator; recording the strain reading of the dial indicator; and calculating to obtain a strain value. According to the structural strain measuring device and the using method, the manufacturing cost is low, the structure is simple, the strain measuring effect is visual, the strain can be reflected through the reading of the dial indicator, and therefore the requirement of strain measuring work is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of strain measurement, and in particular to a structural strain measurement device and a method of using the same. BACKGROUND

[0002] With the continuous development of the construction industry, the demand for strain measurement of building structures such as concrete and steel structures is increasing. Accurate strain measurement is crucial for assessing the safety, durability and performance of structures.

[0003] The existing strain measurement methods for structures such as concrete have varying degrees of problems and cannot meet the needs of actual engineering. For example, strain gauge electronic measurement devices are susceptible to temperature, humidity and electromagnetic interference, have poor stability and require complex wiring; optical fiber sensing technology is costly, installation and debugging are tedious, and is prone to failure due to mechanical damage; ultrasonic detection is greatly affected by material uniformity, and the results are significantly biased; the rebound method relies on the surface state of the concrete, and the measurement accuracy is significantly affected by carbonation depth, age and other factors, and cannot directly obtain strain data. Traditional mechanical measurement instruments have low precision and are difficult to capture subtle strain.

[0004] Therefore, there is a need for a structural strain measurement device and a method of using the same to at least partially solve the above technical problems. SUMMARY

[0005] In view of this, the embodiments of the present application provide a structural strain measurement device and a method of using the same to at least solve one of the problems in the prior art.

[0006] In a first aspect, the present application provides a structural strain measurement device, a structural strain measurement device, characterized in that the measurement device comprises: a closed box, the box comprising a first box part and a second box part that can move horizontally relative to each other; the first box part and the second box part are used to connect to the set positions of the target to be measured respectively; a first push-pull block arranged at a first height of the internal space of the box, one end of the first push-pull block being connected to the first box part, and the other end being provided with a first push-pull rod extending in a first horizontal direction; a dial gauge arranged at a second height of the internal space of the box, the dial gauge being connected to the second box part; a second push-pull block arranged at the same height as the dial gauge in the internal space of the box, one end of the second push-pull block being connected to the measuring needle of the dial gauge, and the other end being provided with a second push-pull rod extending in a second horizontal direction; the second push-pull block is horizontally slidable relative to the dial gauge in the second horizontal direction; and a lever arranged in the internal space of the box, both ends of the lever being rotatably connected to the first push-pull rod and the second push-pull rod, respectively, and being rotatable about a set fulcrum; The distance between the first end of the lever connected to the first push-pull rod and the set fulcrum is less than the distance between the second end of the lever connected to the second push-pull rod and the set fulcrum.

[0007] Furthermore, the lever is provided with multiple through holes; the measuring device also includes a rod-shaped precision adjuster for passing through the through holes of the lever, so that the through hole through which the precision adjuster passes serves as the set fulcrum of the lever.

[0008] The structural strain measurement device of this application has adjustable accuracy, high versatility, and is suitable for strain measurement for various purposes and occasions.

[0009] Furthermore, the measuring device also includes a guide block disposed in the internal space of the housing; the guide block is fixedly connected to the second housing portion and contacts the upper surface of the second push-pull block.

[0010] The structural strain measuring device of this application uses a guide block to guide the second push-pull block to move in the second horizontal direction, thereby reducing the measurement error of the measuring device.

[0011] Furthermore, the second push-pull block is also provided with a third push-pull rod for connecting to a dial indicator. One end of the third push-pull rod is fixedly connected to the second push-pull block, and the other end is bolted to the dial indicator.

[0012] In the structural strain measuring device of this application, the second push-pull block is connected to the dial indicator by a third push-pull rod with bolts, so that the probe of the dial indicator and the second push-pull block remain relatively stable during the repeated movement of the second push-pull block, thereby improving the stability of the device.

[0013] Furthermore, the measuring device also includes: a first support extending from the bottom of the first housing portion for connecting to the target to be measured; and a second support extending from the bottom of the second housing portion for connecting to the target to be measured.

[0014] By using the structural strain measuring device of this application, the first and second supports separate the main part of the measuring device from the target to be measured, reducing the influence of other forces besides strain on the measuring device and improving the stability and accuracy of the measurement process.

[0015] Furthermore, the measuring device includes a zeroing mechanism for adjusting the relative position of the first housing portion and the second housing portion. The zeroing mechanism includes: an adjusting sleeve, the adjusting sleeve including an adjusting groove at one end of the adjusting sleeve and a fixing groove at the other end of the adjusting sleeve; a first adjusting rod with one end connected to a first support and the other end connected to the adjusting groove; a threaded end of the first adjusting rod connected to the adjusting groove for engaging with the adjusting groove; and a second adjusting rod with one end connected to a second support and the other end connected to the fixing groove.

[0016] Using the structural strain measuring device of this application, the fixed groove is not disturbed during the process of rotating the adjustment groove to adjust the first housing part, ensuring the relative stability of the second housing part. The zeroing process is simple and practical, and the device is simple and easy to maintain.

[0017] Furthermore, the fixing groove includes: a clamping plate disposed in the fixing groove for clamping the second adjusting rod; the clamping plate includes at least a first clamping plate and a second clamping plate; and a compression spring disposed on the inner surface of the fixing groove and connected to the first clamping plate or the second clamping plate respectively, for realizing the clamping plate clamping the second adjusting rod.

[0018] Using the structural strain measuring device of this application, the clamping plate can cooperate with the fixing groove to hold the second adjusting rod, and the clamping spring can further adjust the clamping effect of the clamping plate on the second adjusting rod.

[0019] Furthermore, the fixing groove is provided with a through hole that penetrates the fixing groove radially; the outer surfaces of the first clamping plate and the second clamping plate are respectively provided with a pull rod that extends beyond the outer surface of the fixing groove through the through hole; a spring wedge is arranged around the pull rod; wherein, when the pull rod drives the first clamping plate or the second clamping plate to separate from the second adjusting rod, the spring wedge is locked on the outer surface of the fixing groove to fix the pull rod.

[0020] The structural strain measuring device of this application incorporates a spring wedge-shaped pull rod to facilitate adjustment of the relative position between the clamping plate and the second adjusting rod in the fixed groove. When the pull rod is pressed down, the second adjusting rod is clamped by the clamping plate; when the pull rod is lifted, the second adjusting rod can move freely, avoiding the influence of the zeroing device on the strain measurement process.

[0021] Furthermore, the measuring device also includes a scale rod disposed on one side at the connection between the first housing part and the second housing part, for reading the relative movement distance between the first housing part and the second housing part.

[0022] Using the structural strain measuring device of this application, the scale rod can clearly reflect the relative movement distance of the first housing part and the second housing part, ensuring that the zeroing is accurate.

[0023] The structural strain measuring device of this application has the following advantages: 1. Low manufacturing cost, simple structure, and easy replacement and maintenance of parts.

[0024] 2. Easy to install and the testing process is not easily disturbed.

[0025] Secondly, this application also provides a method for using the structural strain measuring device based on the above technical solution, the method including: The structural strain measuring device is placed on the target to be measured, and the first and second housing parts are connected to the set positions on the target. The initial length to be measured of the target is recorded. ; Record the distance 'a' between the set fulcrum and the first endpoint, and derive the lever ratio α based on the lever length 'b', where, ; Record the initial reading of the dial indicator. ; When strain occurs, record the strain reading on the dial gauge. ; The strain value was calculated. .

[0026] The method of using the structural strain measuring device of this application improves the accuracy of the device by zeroing; the strain conversion can be realized by simply reading the data of the dial gauge and the value of the scale rod. The operation is simple and convenient.

[0027] Additional advantages, objectives, and features of this application will be set forth in part in the description which follows, and will in part become apparent to those skilled in the art upon review of the following description, or may be learned by practice of the application. The objectives and other advantages of this application can be realized and obtained by means of the structures specifically pointed out in the specification and drawings.

[0028] Those skilled in the art will understand that the purposes and advantages that can be achieved with this application are not limited to those specifically described above, and that the above and other purposes that this application can achieve will be more clearly understood from the following detailed description. Attached Figure Description

[0029] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, do not constitute a limitation thereof. The components in the drawings are not drawn to scale but are merely for illustrating the principles of this application. For ease of illustration and description of certain parts of this application, corresponding portions in the drawings may be enlarged, i.e., may appear larger relative to other components in an exemplary device actually manufactured according to this application. In the drawings: Figure 1 This is a schematic diagram of a structural strain measuring device according to an embodiment of this application; Figure 2 This is a schematic cross-sectional view of the adjusting sleeve of a structural strain measuring device according to another embodiment of this application; Figure 3 This is a schematic diagram of the internal structure of the fixing groove of the structural strain measuring device according to another embodiment of this application; Figure 4 A schematic diagram of the side of the tie rod of a structural strain measuring device according to another embodiment of this application; and Figure 5 This is a schematic diagram of the method of using a structural strain measuring device according to another embodiment of this application.

[0030] Explanation of reference numerals in the attached figures: First housing 100; First push-pull block 110; First push-pull rod 120; First support 130; Second housing 200; Dial indicator 210; Second push-pull block 220; Second push-pull rod 230; Second support 240; Guide block 250; Third push-pull rod 260; Lever 300; Setting fulcrum 310; Adjusting sleeve 410; First adjusting rod 420; Second adjusting rod 430; Adjusting groove 440; Fixing groove 450; First clamping plate 451; Second clamping plate 452; Compression spring 453; Pull rod 454; Spring wedge 455; Limiting plate 456; Scale rod 500. Detailed Implementation

[0031] The purposes and functions of this application, as well as the methods for achieving these purposes and functions, will be clarified by referring to exemplary embodiments. However, this application is not limited to the exemplary embodiments disclosed below; it can be implemented in various forms. The specification is merely intended to help those skilled in the art to comprehensively understand the specific details of this application.

[0032] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof.

[0033] Ordinal numbers such as “first” and “second” used in this application are merely identifiers and have no other meaning, such as a specific order. Moreover, for example, the term “first item” does not imply the existence of “second item”, and the term “second item” does not imply the existence of “first item”.

[0034] It should be noted that the terms “upper,” “lower,” “front,” “left,” “right,” “inner,” “outer,” and similar expressions used in this article are for illustrative purposes only and are not intended to be limiting.

[0035] With the continuous development of the construction industry, the demand for strain measurement of building structures such as concrete and steel structures is increasing. Accurate strain measurement is crucial for assessing the safety, durability, and performance of structures.

[0036] Current strain measurement methods for concrete and other structures all have varying degrees of problems, making it difficult to meet the needs of practical engineering. For example, strain gauge electronic measuring devices are susceptible to temperature, humidity, and electromagnetic interference, have poor stability, and require complex wiring; fiber optic sensing technology is expensive, cumbersome to install and debug, and prone to failure due to mechanical damage; ultrasonic testing is greatly affected by the internal homogeneity of the material, resulting in significant deviations in the results; the rebound method depends on the surface condition of the concrete, and its measurement accuracy is significantly affected by factors such as carbonation depth and age, and it cannot directly obtain strain data. Traditional mechanical measuring instruments have low accuracy and are unable to capture subtle strains.

[0037] Therefore, this application provides a structural strain measurement device and its usage method to at least partially solve the problems of the above-mentioned solutions.

[0038] The first aspect of this application provides a structural strain measurement device. Please refer to... Figure 1 The measuring device includes: The sealed enclosure includes a first enclosure section 100 and a second enclosure section 200 that are horizontally movable relative to each other. The first enclosure section 100 and the second enclosure section 200 are respectively connected to the set positions of the target to be measured.

[0039] In this embodiment, to reduce interference from external factors, such as dust particles, impurities, materials, and other substances entering the strain measurement device and thus affecting its service life, stability, and measurement accuracy, the housing is preferably designed as a sealed structure. Of course, the specific sealing methods, degree of sealing, and sealing effect are not limited.

[0040] The first housing portion 100 and the second housing portion 200 are two relatively movable parts of the housing. After being placed on the target to be measured, the magnitude of the strain can be determined by observing the relative movement of the first housing portion 100 and the second housing portion 200. Of course, the housing, the first housing portion 100, and the second housing portion 200 are illustrative terms and do not limit the specific structure of the device.

[0041] The arrangement of the first housing part 100 and the second housing part 200 to move horizontally relative to each other can be a structure in which the slots and bosses cooperate with each other, or a structure similar to a slide rail, depending on whether the first housing part 100 and the second housing part 200 can move horizontally relative to each other.

[0042] In some embodiments, the measuring device further includes a scale bar 500 disposed on one side of the connection between the first housing portion 100 and the second housing portion 200, for reading the relative movement distance between the first housing portion 100 and the second housing portion 200.

[0043] The scale rod 500 may be an extension of the first housing portion 100 at one end and an extension of the second housing portion 200 at the other end. The specific structure and shape are designed to enable the scale rod 500 to measure the relative movement distance between the first housing portion 100 and the second housing portion 200. For example, one end may be a scale rod body marked with a distance corresponding to the relative movement distance between the first housing portion 100 and the second housing portion 200, while the other end is a sleeve fitted onto the scale rod body. The scale may include a zero mark based on the initial state, which facilitates zeroing of the first housing portion 100 and the second housing portion 200 before strain measurement.

[0044] In some embodiments, the measuring device includes a first support 130 extending from the bottom of a first housing portion 100 for connection to a target to be measured. The measuring device also includes a second support 240 extending from the bottom of a second housing portion 200 for connection to a target to be measured.

[0045] The first support 130 and the second support 240 are structures within the housing used to connect the target to be measured. Specifically, the first support 130 or the second support 240 can be an additional structure, fixedly installed on the corresponding first housing part 100 or second housing part 200 by welding or riveting, or the first support 130 or the second support 240 can be a natural extension of the first housing part 100 or the second housing part 200. The first support 130 and / or the second support 240 can be located at the bottom of the housing, either on either side of the bottom edge or at other locations on the bottom. The first support 130 and / or the second support 240 can be of various shapes, such as cuboids, cylinders, square pyramids, or combinations of various shapes, depending on the specific arrangement to achieve stable placement on the target and reflect strain information.

[0046] A first push-pull block 110 is installed at a first height in the internal space of the box. One end of the first push-pull block 110 is connected to the first box part 100, and the other end is provided with a first push-pull rod 120 extending in the first horizontal direction.

[0047] In this embodiment, the first push-pull block 110 and the first push-pull rod 120 are illustrative and can be configured in various ways, such as cuboids, cylinders, etc., depending on the intended function. In one embodiment, when the second housing portion 200 is a relatively fixed structure, the first push-pull block 110 and the first push-pull rod 120 mainly serve to transmit relative movement, and can also be corresponding protruding extensions of the first housing portion 100, fixed inside the first housing portion 100.

[0048] A dial indicator 210 is installed at a second height within the housing, and is connected to the second housing section 200. A second push-pull block 220 is installed at the same height as the dial indicator 210 within the housing. One end of the second push-pull block 220 is connected to the probe of the dial indicator 210, and the other end is provided with a second push-pull rod 230 extending along a second horizontal direction. The second push-pull block 220 can slide horizontally relative to the dial indicator 210 along the second horizontal direction.

[0049] It is understood that the first height and the second height are illustrative and not intended to limit the scope of protection of this application. The first height and the second height can be located at different heights, wherein the first height can be lower or higher than the second height. Of course, the first height and the second height can also be located at the same height. For example, the first push-pull block 110, the second push-pull block 220 and the lever 300 are all on the same horizontal plane, and such an arrangement can also achieve the basic function of the measuring device.

[0050] In this embodiment, the dial indicator 210 is a tool used to characterize the displacement of the second push-pull block 220. This is an illustrative description; other instruments that can achieve the same function, such as dial gauges, digital dial indicators 210, and electronic micrometers, are also protected by this application. It is understood that because the second push-pull block 220 can slide horizontally relative to the dial indicator 210 along a second horizontal direction, the dial indicator 210 can be fixedly installed in the second housing 200 to achieve its function. The probe of the dial indicator 210 can be positioned along the second horizontal direction. The dial indicator 210 can be fixed to the second housing 200 by additionally providing a fixing rod to connect the dial indicator head and fix it to the second housing 200. Of course, when the housing is sealed, the dial can be oriented at an angle that facilitates observation, and can be made of glass, transparent plastic, or by directly drilling a hole to clearly read the reading of the dial indicator 210.

[0051] The second push-pull block 220 and the second push-pull rod 230 are also schematic representations similar to the first push-pull block 110 and the first push-pull rod 120. They can be arranged in various ways, such as cuboids, cylinders, etc., depending on the desired function. The second push-pull block 220 can slide along a second horizontal direction by having a flat channel below it for sliding, with the second push-pull block 220 placed in the channel. Preferably, the second push-pull block 220 can also be a trolley with rollers, placed in the channel for sliding along the second horizontal direction. The second push-pull block 220 can also be mounted on a slide rail. Preferably, the second push-pull block 220 is mounted on a slide rail, with a groove at its bottom, and the slide rail is designed to accommodate the protrusion of the groove to limit the displacement of the second push-pull block 220 in other directions.

[0052] In some embodiments, the second push-pull block 220 is a lightweight slider. When the strain direction of the structure to be measured has a vertical component, the second push-pull block 220 may shift due to its own weight. By using a lightweight slider, the second push-pull block 220 is lightweight and less affected by gravity, thus reducing errors when the direction of the target to be measured is not perfectly horizontal.

[0053] In some embodiments, the measuring device further includes a guide block 250 disposed in the internal space of the housing. The guide block 250 is fixedly connected to the second housing portion 200 and contacts the upper surface of the second push-pull block 220.

[0054] The guide block 250 is a structure used to limit the displacement of the second push-pull block 220 in a non-horizontal direction. The guide block 250 can be in various configurations, such as a cuboid shape. Alternatively, the guide block 250 may not be specifically provided, and the second housing portion 200 may be directly positioned above the second push-pull block 220. Preferably, the guide block can cooperate with the channel in the above embodiment to jointly limit the displacement of the second push-pull block in a second horizontal direction. When the second push-pull block 220 is positioned in the channel, the lower surface of the guide block 250 can maintain a certain distance from the channel, for example, slightly greater than the height of the second push-pull block 220, thereby not hindering the movement of the second push-pull block 220 in the second horizontal direction.

[0055] In some embodiments, the second push-pull block 220 is further provided with a third push-pull rod 260 for connecting the dial indicator 210, one end of the third push-pull rod 260 being fixedly connected to the second push-pull block 220 and the other end being bolted to the dial indicator 210.

[0056] The third push-pull rod 260 is an additional component on the second push-pull block 220 for connecting with the dial indicator 210. The third push-pull rod 260 can be a rod-shaped object fixed to the second push-pull block 220. Preferably, it can be the two ends of the same rod as the second push-pull rod 230, passing through the second push-pull block. Specifically, the end of the third push-pull rod 260 connected to the dial indicator 210 can be hollowed out and have a hole for bolting the dial indicator 210's probe. The probe of the dial indicator 210 can be placed inside the third push-pull rod 260. This design improves the connection stability between the dial indicator 210 and the second push-pull block 220, preventing the dial indicator's probe from shifting during the back-and-forth movement of the second push-pull block 220.

[0057] A lever 300 is installed inside the housing. Both ends of the lever 300 are rotatably connected to a first push-pull rod 120 and a second push-pull rod 230, respectively, and are rotatable around a set fulcrum 310. The distance between the first end of the lever 300 connected to the first push-pull rod 120 and the set fulcrum 310 is less than the distance between the second end of the lever 300 connected to the second push-pull rod 230 and the set fulcrum 310.

[0058] Specifically, lever 300 can be a rigid structure used to transmit displacement, resistant to spontaneous contraction or expansion due to environmental factors. The fulcrum 310 is the force-bearing point of lever 300, and can be set by applying external force, such as binding or clamping, allowing lever 300 to rotate around the fulcrum 310. The material of lever 300 can be a simple metal rod or a wooden rod, designed to connect the first push-pull rod 120 and the second push-pull rod 230 and transmit displacement. Of course, besides the basic rod shape, lever 300 can also have other shapes. Specifically, it can be a rod shape modified to accommodate the fulcrum 310, for example, extending outwards from the location of the fulcrum 310. Here, the shape and material of lever 300 are not limited.

[0059] It is understandable that, since the distance between the first endpoint and the set fulcrum 310 is less than the distance between the second endpoint and the set fulcrum 310, when the lever 300 rotates around the set fulcrum 310, the displacement of the first push-pull rod 120 is less than the displacement of the second push-pull rod 230. In other words, through the lever 300, the displacement of the second push-pull rod 230 amplifies the displacement of the first push-pull rod 120, thereby amplifying the strain measurement effect and improving the measurement accuracy.

[0060] When strain occurs, the first housing portion 100 and the second housing portion 200 will generate relative displacement, causing the first push-pull block 110 and the first push-pull rod 120 to move in the first horizontal direction. This causes the lever 300 connected to the first push-pull rod 120 to rotate, which in turn causes the second push-pull rod 230 connected to the lever 300 to move the second push-pull block 220 in the second horizontal direction, thereby changing the reading of the dial indicator 210. At this time, the movement directions of the first push-pull block 110 and the second push-pull block 220 are opposite. The triangle formed by the displacement path segment of the first push-pull rod 120 and the line segment from the set fulcrum 310 to the first endpoint is similar to the triangle formed by the displacement path segment of the second push-pull rod 230 and the line segment from the set fulcrum 310 to the second endpoint. Therefore, the ratio of the relative displacement length of the first push-pull block 110 to the relative displacement length of the second push-pull block 220 is equal to the ratio of the distance from the first endpoint to the set fulcrum 310 to the distance from the second endpoint to the set fulcrum 310. Thus, the dial indicator 210 can proportionally feedback the displacement of the first housing portion 100 relative to the second housing portion 200 based on the position of the set fulcrum 310. Based on the change in the reading of the dial indicator 210 and the proportional relationship between the displacements of the second push-pull block 220 and the first push-pull block 110, the relative displacement of the first housing portion 100 and the second housing portion 200 can be determined, thereby measuring the strain value of the target to be measured.

[0061] Therefore, the structural strain measurement device of this application has low manufacturing cost and simple structure. The combination of levers, push-pull blocks, and dial indicators can meet the strain measurement needs of actual work, and the parts are easy to replace and maintain. Moreover, the device adopts a mechanical structure, which is easy to install, and the testing process is not easily affected by external factors such as electromagnetic fields and humidity, and is not easily affected by other interferences.

[0062] Preferably, the first push-pull rod 120 and / or the second push-pull rod 230 are connected to the lever 300 by a hinged connection. This hinged connection makes the connection between the first push-pull rod 120 and / or the second push-pull rod 230 and the lever 300 more flexible and convenient, and also simplifies device maintenance. Of course, other connection methods can also be used, such as providing a ring structure on the first push-pull rod 120 and / or the second push-pull rod that mates with the lever 300, or providing a slot structure on the first push-pull rod 120 and / or the second push-pull rod that mates with the lever 300. Similar alternative designs with movable connections are also included within the scope of this application.

[0063] In some embodiments, the lever 300 is provided with a plurality of through holes. The measuring device also includes a rod-shaped precision adjuster passing through the through holes of the lever 300, such that the through holes through which the precision adjuster passes serve as a setting fulcrum 310 of the lever 300.

[0064] The precision adjuster passes through a through hole in lever 300, making the through hole through which the precision adjuster passes serve as the set fulcrum 310 of lever 300. Alternatively, the precision adjuster can pass through the through hole by having a mating threaded structure between the precision adjuster and the through hole, further increasing the force on lever 300 at the set fulcrum 310 and making the precision adjuster less prone to loosening after tightening. The precision adjuster can also be a rod with a variable diameter, thereby continuously increasing the force on lever 300 as it passes through the through hole.

[0065] It is understandable that, since the lever 300 has multiple through holes, in practical applications, the position of the set fulcrum 310 of the lever 300 can be changed based on the through holes it passes through, thereby adjusting the distance between the set fulcrum 310 and the two ends of the lever 300, and thus adjusting the displacement ratio between the first push-pull rod 120 and the second push-pull rod 230 at both ends of the lever 300.

[0066] The structural strain measuring device provided in this embodiment is inexpensive to manufacture, has a simple structure, and its parts are easy to replace and maintain, further reducing the cost of long-term use. It offers high measurement accuracy, converting the strain displacement of the target into a reading on a dial indicator 210 for direct visualization, thus meeting the needs of strain measurement work.

[0067] In some embodiments, the measuring device includes a zeroing mechanism for adjusting the relative position of the first housing portion 100 and the second housing portion 200. The zeroing mechanism includes an adjusting sleeve 410, a first adjusting rod 420, and a second adjusting rod 430.

[0068] It is understandable that when the first push-pull rod 120 and the second push-pull rod 230 are set horizontally, the lever 300 can remain vertical before strain measurement to minimize errors. Although the relative positions of the first housing 100 and the second housing 200 can be actively adjusted by manually pushing or pulling the first housing 100 or the second housing 200 before placing the target to be measured, this method may result in inaccurate zeroing. Therefore, it is necessary to set up a zeroing mechanism for the zeroing of the measuring device to improve the accuracy of the measurement.

[0069] In the zeroing mechanism, the adjusting sleeve 410 includes an adjusting groove 440 at one end and a fixing groove 450 at the other end. One end of the first adjusting rod 420 is connected to the first support 130. The other end of the first adjusting rod 420 is connected to the adjusting groove 440. The end of the first adjusting rod 420 connected to the adjusting groove 440 is provided with a thread for engaging with the adjusting groove 440. One end of the second adjusting rod 430 is connected to the second support 240. The other end of the second adjusting rod 430 is connected to the fixing groove 450.

[0070] The adjusting sleeve 410 is a schematic designation used to describe its connection with the first adjusting rod 420 and the second adjusting rod 430. It can be cylindrical or cuboid in shape, etc., to achieve the connection function between the first adjusting rod 420 and the second adjusting rod 430. The adjusting groove 440 can be a component provided on the adjusting sleeve 410 for adjusting the first adjusting rod 420, with threads on its inner surface to mate with the first adjusting rod 420. The specific thread structure, length, and inner diameter are determined to achieve the function of adjusting the first adjusting rod 420. By screwing in and out of the thread, the adjusting groove 440 can engage with the first adjusting rod 420, causing the first adjusting rod 420 to move horizontally, thereby moving the first support 130 and achieving relative movement between the first housing part 100 and the second housing part 200, thus achieving zeroing. The fixing groove 450 can be a component for connecting the second adjusting rod 430, and can be detachably connected to the second adjusting rod. For example, it can be achieved through snap-fit ​​or bolt connection.

[0071] The fixing groove 450 and the adjusting groove 440 on the adjusting sleeve 410 can be arranged in a way that allows them to move relative to each other without contacting one another. For example, when the adjusting groove 440 is an additional component movably connected to the adjusting sleeve 410, the fixing groove 450 can be an extension of the adjusting sleeve 410 to the other end, or it can be an additional component provided and disposed on the adjusting sleeve 410 using a fixed or detachable connection. Conversely, when the fixing groove 450 is an additional component movably connected to the adjusting sleeve 410, the adjusting groove 440 can also be an extension of the adjusting sleeve 410 to the other end, or it can be an additional component provided and disposed on the adjusting sleeve 410 using a fixed or detachable connection. Since the fixed groove 450 and the adjusting groove 440 are located at different positions on the adjusting sleeve 410 and move relative to each other, during the process of rotating the adjusting groove 440 to adjust the first housing part 100, clamping or locking can be used to fix one part of the fixed adjusting sleeve 410 or the fixed groove 450 relative to each other while the other part moves relative to each other. Thus, the fixed groove 450 will not produce relative displacement with the second adjusting rod 430, thereby ensuring the relative stability of the second housing part 200. This allows for the gradual adjustment of the first housing part relative to the second housing part, making the zeroing process simple and practical.

[0072] In some embodiments, the fixing groove 450 includes a clamping plate disposed within the fixing groove 450 for clamping the second adjusting rod 430. The clamping plate includes at least a first clamping plate 451 and a second clamping plate 452. The fixing groove 450 also includes a compression spring 453 disposed on the inner surface of the fixing groove 450 and connected to the first clamping plate 451 or the second clamping plate 452 respectively, for adjusting the clamping degree between the clamping plate and the second adjusting rod 430.

[0073] Please see Figure 2 and Figure 3 The clamping plate can be shaped to fit the inner diameter of the fixing groove 450. For example, viewed from the side where the fixing groove 450 connects to the second adjusting rod 430, the inner surface of the fixing groove 450 can be circular or rectangular. Correspondingly, the cross-section of the clamping plate can also be arc-shaped or rectangular. Of course, the clamping plate can also clamp the second adjusting rod 430 in combination with at least the first clamping plate 451 and the second clamping plate 452. In this case, the cross-sectional shape of the first clamping plate 451 and the second clamping plate 452 can also be semi-circular, straight, or other combinations. Of course, the setting position of the first clamping plate 451 and the second clamping plate 452, such as up and down, front and back, is not specifically limited. It is based on achieving the function of clamping the second adjusting rod 430. The compression spring 453 provided in the fixing groove 450 can connect the clamping plate and the inner surface of the fixing groove 450. When the compression spring 453 is in a compressed state, the clamping plate naturally clamps the second adjusting rod 430.

[0074] It is understandable that during the zeroing process, the fixed groove 450 can hold the second adjusting rod 430 so that the positions of the adjusting sleeve 410 and the second housing part 200 are relatively fixed. When the adjusting groove 440 is rotated, the first adjusting rod 420 drives the first housing part 100 to move horizontally, thereby finely adjusting the relative positions of the first housing part 100 and the second housing part 200.

[0075] When strain measurement begins after zeroing, the clamp can be loosened to allow relative movement of the adjusting sleeve 410 and the second housing 200, thus avoiding interference with the measurement process. Preferably, after measurement or before the next zeroing, the positional relationship between the first housing 100 and the second housing 200 can be appropriately adjusted to leave a certain gap between the end of the second adjusting rod 430 and the inner surface of the fixing groove 450, thereby providing sufficient room for the second adjusting rod 430 to move.

[0076] In some embodiments, the fixing groove 450 is provided with a through hole penetrating the fixing groove 450. The outer surfaces of the first clamping plate 451 and the second clamping plate 452 are respectively provided with pull rods 454 extending beyond the outer surface of the fixing groove 450 through the through holes. A spring wedge 455 is arranged around the pull rod 454. When the pull rod 454 causes the first clamping plate 451 or the second clamping plate 452 to separate from the second adjusting rod 430, the spring wedge 455 engages with the outer surface of the fixing groove 450 to fix the pull rod 454.

[0077] Please see Figure 4The pull rod 454 is a long, narrow component, which can be a cuboid, cylinder, or similar shape. Other components, such as a rubber protective sleeve, can be provided at the end of the pull rod 454 extending beyond the outer surface of the fixing groove 450 to protect the pull rod 454 or facilitate the application of force to it. The spring wedge 455 can be a component disposed on the side of the pull rod 454, including a spring structure for providing elasticity and a wedge for fixing. The specific shape of the wedge can be wedge-shaped, cuboid, or other shapes. Preferably, the spring of the spring wedge 455 can be disposed inside the pull rod 454. When the pull rod 454 causes the first clamping plate 451 or the second clamping plate 452 to separate from the second adjusting rod 430, the spring wedge 455 can extend beyond the outer surface of the fixing groove 450, and the spring of the spring wedge 455 naturally extends, thereby causing the wedge to leave the through hole and reach the outer surface of the fixing groove 450. When the pull rod 454 is released, the spring wedge 455 engages with the pull rod 454 and engages on the outer surface of the fixing groove 450, causing the clamping plate to disengage from the contact second adjusting rod 430. This allows the second adjusting rod 430 to move freely, preventing the zeroing device from affecting the strain measurement process. When zeroing is required, the pull rod 454 can be further pressed into the fixing groove 450 by external force, causing the spring wedge 455 to enter the through hole. The spring in the spring wedge 455 is compressed, enabling the second adjusting rod 430 to be clamped or released by the pull rod 454.

[0078] In some embodiments, a limiting plate 456 is provided on the side of the pull rod 454 to limit the movement of the spring wedge 455. One end of the limiting plate 456 connected to the pull rod 454 is disposed between the spring wedge 455 and the end of the pull rod 454, and extends in a direction away from the end of the pull rod 454.

[0079] The limiting plate 456 is fixedly connected to the side of the pull rod 454. When the pull rod 454 is pulled to move the spring wedge 455 away from the through hole to the outer surface of the fixing groove 450, the spring in the spring wedge 455 pushes the wedge side to adhere to the limiting plate 456. When the pull rod 454 is released, the other end of the spring wedge 455 is again engaged with the outer surface of the fixing groove 450, thus making the spring wedge 455 cooperate with the pull rod 454 to be engaged with the outer surface of the fixing groove 450. This design prevents the spring from being excessively stretched by the wedge, protecting the service life of the spring wedge 455.

[0080] It is understood that the terms "horizontal direction" and "height," used to describe the positional relationship of components in this embodiment, are exemplary descriptions and can be used to describe the situation when the measuring device is placed horizontally on the horizontal surface of the target to be measured, rather than limiting the structure of the device or its measurement direction. The measuring device provided in this embodiment can also be used to measure the strain of the target in non-horizontal directions.

[0081] Secondly, this application also provides a method for using the structural strain measurement device based on the above-mentioned technical solution. Please refer to [link / reference]. Figure 5 Usage methods include: S1, place the structural strain measuring device on the target to be measured, slide the first housing part 100 and the second housing part 200 to the set position of the target to be measured, and record the initial length to be measured of the target. .

[0082] S2, record the distance 'a' between the set fulcrum 310 and the first endpoint, and derive the lever ratio α based on the length 'b' of the lever 300, where, .

[0083] S3, record the initial reading of dial indicator 210. .

[0084] S4, when strain occurs, record the strain reading of dial gauge 210. .

[0085] S5, the strain value is calculated. .

[0086] It is understandable that during the use of the above measuring device, because the lever 300 rotates around the set fulcrum 310, the first push-pull block 110 and the second push-pull block 220 move in opposite directions in equal proportion. The ratio of the displacement length of the first push-pull rod 120 to the displacement length of the second push-pull rod 230 pushed by the lever 300 is the lever multiple calculated in S2. Therefore, it is only necessary to read the data of the dial indicator 210 and perform simple distance measurement work. Based on the position of the set fulcrum 310, the strain can be calculated. The operation is simple and convenient.

[0087] For example, in one embodiment of this application, after the measuring device is placed at the measurement position of the target, the distance from the connection point between the first housing part 100 and the target to the connection point between the second housing part 200 and the target can be measured as 20cm. Since the lever 300 inside the device is 11cm long and the fulcrum 310 is set 1cm away from the first endpoint, the lever ratio at this time is 10. When the reading of the dial indicator 210 changes by 0.001mm, the change in strain value of the target can be measured as 0.5με.

[0088] In some embodiments, the sliding of the first housing portion 100 and the second housing portion 200 to the set position of the target to be measured further includes: S11, adjusting the relative distance between the first housing portion 100 and the second housing portion 200 by a zeroing mechanism based on the value of the scale rod 500.

[0089] With this setup, the zeroing device can reduce the error of the strain measurement device, and the scale rod 500 makes the zeroing result visible, thereby further improving the measurement accuracy of the device.

[0090] Preferably, adjusting the relative distance between the first housing portion 100 and the second housing portion 200 via a zeroing mechanism based on the value of the scale rod 500 further includes: S111, push or pull the first housing part 100 and the second housing part 200 to a relative position close to their initial state.

[0091] S112, apply a force to the pull rod 454 in the direction of the inner diameter of the fixing groove 450 until the clamping plate clamps the second adjusting rod 430.

[0092] S113, keep the adjusting sleeve 410 relatively stable, and at the same time rotate the adjusting groove 440 to make the first adjusting rod 420 move.

[0093] S114, observe the value of the scale bar 500 until it reaches the set value, then stop rotating the adjustment groove 440.

[0094] S115, apply a force to the pull rod 454 away from the inner diameter of the fixing groove 450, until the spring wedge 455 of the pull rod 454 is exposed on the outer surface of the fixing groove 450 and the clamping plate releases the second adjusting rod 430.

[0095] When the zero mark is set on the scale lever 500, the set value can be 0.

[0096] With this configuration, the zeroing device can easily adjust the relative distance between the first housing 100 and the second housing 200, while also avoiding interference from the clamping device during the strain measurement process.

[0097] Of course, the strain measurement accuracy of the device in this application is allowed to have a certain degree of error. However, as can be seen from the above embodiments, the strain change value measured by the measurement method of this application is sufficient for practical work use, and this application has already achieved the purpose of convenient strain measurement. If improvements are made to the above method without exceeding the innovative capabilities of those skilled in the art, they should also be within the scope of protection claimed by this application.

[0098] Furthermore, the wording related to serial numbers and designations in this disclosure, such as “first,” “second,” “S1,” “S2,” and similar expressions, is used for distinguishing purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number or necessary order of the indicated technical features.

[0099] Other embodiments of this application will be readily conceived and understood by those skilled in the art in conjunction with the description and practice disclosed herein. The descriptions and embodiments are to be considered exemplary only, and the true scope and spirit of this application are defined by the claims.

Claims

1. A structural strain measuring device, characterized in that, The measuring device includes: A sealed enclosure, comprising a first enclosure section and a second enclosure section that can move horizontally relative to each other; the first enclosure section and the second enclosure section are respectively connected to a set position of the target to be measured. A first push-pull block is installed at a first height in the internal space of the box, one end of the first push-pull block is connected to the first box part, and the other end is provided with a first push-pull rod extending along a first horizontal direction; A dial indicator is installed at a second height within the interior space of the enclosure, and the dial indicator is connected to the second enclosure section; A second push-pull block is installed in the internal space of the housing at the same height as the dial indicator. One end of the second push-pull block is connected to the probe of the dial indicator, and the other end is provided with a second push-pull rod extending along a second horizontal direction. The second push-pull block can slide horizontally relative to the dial indicator along the second horizontal direction. A lever is installed in the internal space of the box, and the two ends of the lever are respectively rotatably connected to a first push-pull rod and a second push-pull rod, and can rotate around a set fulcrum; Wherein, the distance between the first end point of the lever connected to the first push-pull rod and the set fulcrum is less than the distance between the second end point of the lever connected to the second push-pull rod and the set fulcrum.

2. The structural strain measuring device according to claim 1, characterized in that, The lever is provided with multiple through holes; the measuring device also includes a rod-shaped precision adjuster that passes through the through holes of the lever, so that the through holes through which the precision adjuster passes serve as the set fulcrum of the lever.

3. The structural strain measuring device according to claim 1, characterized in that, The measuring device further includes a guide block disposed in the internal space of the housing; the guide block is fixedly connected to the second housing part and contacts the upper surface of the second push-pull block.

4. The structural strain measuring device according to claim 1, characterized in that, The second push-pull block is also provided with a third push-pull rod for connecting to the dial indicator. One end of the third push-pull rod is fixedly connected to the second push-pull block, and the other end is bolted to the dial indicator.

5. The structural strain measuring device according to claim 1, characterized in that, The measuring device includes: A first support extending from the bottom of the first housing portion is used to connect to the target to be measured; The second support extends from the bottom of the second housing for connecting to the target to be measured.

6. The structural strain measuring device according to claim 5, characterized in that, The measuring device includes a zeroing mechanism for adjusting the relative positions of the first housing portion and the second housing portion, the zeroing mechanism comprising: An adjusting sleeve, the adjusting sleeve including an adjusting groove at one end and a fixing groove at the opposite end; A first adjusting rod is connected at one end to the first support and at the other end to the adjusting groove; the end of the first adjusting rod connected to the adjusting groove is provided with a thread for engaging with the adjusting groove. A second adjusting rod, with one end connected to the second support and the other end connected to the fixed groove.

7. The structural strain measuring device according to claim 6, characterized in that, The fixing groove includes: A clamping plate is disposed within the fixed groove to clamp the second adjusting rod; the clamping plate includes at least a first clamping plate and a second clamping plate. A compression spring, which is installed on the inner surface of the fixing groove and connected to the first clamping plate or the second clamping plate respectively, is used to clamp the second adjusting rod with the clamping plate.

8. The structural strain measuring device according to claim 7, characterized in that, The fixing groove is provided with a through hole that penetrates the fixing groove radially; the outer surfaces of the first clamping plate and the second clamping plate are respectively provided with a pull rod that extends beyond the outer surface of the fixing groove through the through hole; the pull rod is surrounded by a spring wedge; When the pull rod causes the first or second clamping plate to separate from the second adjusting rod, the pull rod is fixed by the spring wedge locking onto the outer surface of the fixing groove.

9. The structural strain measuring device according to claim 1, characterized in that, The measuring device also includes a scale bar disposed on one side of the connection between the first housing part and the second housing part, for reading the relative movement distance between the first housing part and the second housing part.

10. A method of using the structural strain measuring device according to any one of claims 1-9, characterized in that, The method of use includes: The structural strain measuring device is placed horizontally on the target to be measured. The first and second housing parts are connected to the set positions on the target to be measured, and the initial length of the target to be measured is recorded. ; Record the distance 'a' between the set fulcrum and the first endpoint, and derive the lever ratio α based on the lever length 'b', where, ； Record the initial reading of the dial indicator. ; When strain occurs, record the strain reading on the dial gauge. ; The strain value was calculated. .

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