Portable material elasticity modulus measuring instrument and measuring method

Abstract

The invention provides a portable material elasticity modulus measuring instrument and a measuring method. The measuring instrument comprises an outer frame; an arch; the shell is arranged in the outer frame and is provided with a first end and a second end; the position of the first end relative to the outer frame is adjusted through a traction rope; the second end is fixed to a support, and the support is in contact and sliding connection with the inner side of the outer frame and is fixed to the inner side of the outer frame when the support is located at the bottom of the outer frame. A detection assembly; the strain sensor comprises a strain piece and a measuring piece, and the strain piece is arranged on the arch crown of the arch piece to collect the arch crown strain force of the arch piece; the measuring piece is electrically connected with the strain piece and displays a strain force value acquired by the strain piece; and the rotating assembly is connected with the arched piece so that the first end can rotate in the thickness direction of the outer frame. According to the method, the elasticity modulus of the material can be calculated according to different materials, and the strength grade of the to-be-tested material is calculated according to the relationship between the elasticity modulus of the different materials and the strength of the material.

Description

Technical Field

[0001] The present application relates to the technical field of building material testing, and in particular to a portable material elastic modulus measuring instrument and a measuring method. Background Art

[0002] For reinforced concrete structures and other structures, it is necessary to measure the elastic modulus of concrete, so as to obtain the strength of the material based on the relationship between the elastic modulus and the corresponding material strength. The elastic modulus is an important indicator of the material, which can truly reflect the relationship between the stress and strain of the material. Therefore, it is an urgent problem to be solved to measure the elastic modulus of the material conveniently and quickly.

[0003] At present, the elastic modulus of concrete is measured using the pressure method or the acoustic wave method. The pressure method is to apply a certain pressure on the material sample, measure the deformation and bearing capacity of the sample, and then calculate the elastic modulus of the material. This method requires a series of complex test operations, the equipment and instruments are huge, and it needs to be operated in the laboratory. It is costly and time-consuming, and the applicable scenarios are relatively limited. The acoustic wave method emits sound waves into the material sample, and records the propagation time, path, and intensity of the sound waves in the concrete, and calculates the elastic modulus of the concrete according to the propagation law of the sound waves. This measurement method has high requirements for the external environment, and various sound waves have a great influence on its measurement; in addition, because it is necessary to detect the path and intensity of the sound waves, there are certain requirements for the shape of the measured material, which limits the applicability of the measurement.

[0004] Therefore, how to provide a portable material elastic modulus measuring instrument and a measuring method, where the measuring instrument is portable and can quickly obtain the elastic modulus of different materials is a key issue that needs to be solved urgently. Summary of the invention

[0005] The present application aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the purpose of the present application is to propose a portable material elastic modulus measuring instrument and a measuring method, by applying a fixed load to the first end of the arch, so as to calculate the elastic modulus of the material through the depth of displacement of the first end combined with the cross-sectional area of ​​the first end under stress. The measuring instrument of the present application can calculate the elastic modulus of the material for different materials, and according to the relationship between the elastic modulus of different materials and the material strength, the strength grade of the material to be measured can be calculated.

[0006] According to the first aspect of the present application, a portable material elastic modulus measuring instrument is provided, comprising:

[0007] An outer frame; which is open toward the bottom surface of the material to be tested;

[0008] An arched member; the arched member is arranged in the outer frame and has a first end and a second end; the first end and the second end both face the material to be tested to form an arch with the top facing away from the material to be tested; the first end is connected to a traction rope, and the traction rope adjusts the position of the arched member relative to the outer frame; the second end is fixed on a support, and the support is in contact and slidably connected with the inner side of the outer frame, and is fixed to the inner side of the outer frame when the support is located at the bottom of the outer frame;

[0009] A detection component; comprising a strain member and a measuring member, wherein the strain member is arranged at the arch of the arch member to collect the maximum strain force of the arch of the arch member; the measuring member is electrically connected to the strain member and displays the strain force value collected by the strain member; and

[0010] A rotating assembly is connected to the arch member so as to enable the first end to rotate in the thickness direction of the outer frame.

[0011] In some embodiments, the support is at least partially made of metal material, and a magnetic attraction member is provided on the inner bottom of the support facing the outer frame to magnetically fix the support.

[0012] In some embodiments, the support includes multiple linked flip parts, and the movement states of the multiple flip parts are exactly the same; the flip parts are perpendicular or parallel to the magnetic parts, and when the flip parts are parallel to the magnetic parts, the side facing the magnetic parts is made of metal material, so that the magnetic parts can magnetically fix the support.

[0013] In some embodiments, a traction hole is provided on the top of the outer frame, and the traction rope passes through the traction hole to adjust the position of the arch member.

[0014] In some embodiments, the strain element includes two strain gauges with set resistance values, and the two strain gauges are configured using a Wheatstone half-bridge.

[0015] In some embodiments, the resistance value of the strain gauge is 350Ω.

[0016] In some embodiments, the rotating assembly includes a spring member, which is arranged on the outer frame and has an extension direction that is the same as the thickness direction of the outer frame; the spring member is contact-connected to the arch member through a long arm, and the spring member is compressed when the arch member rotates.

[0017] In some embodiments, a groove is provided on the arch member at the connection between the long arm and the arch member to prevent the spring member from affecting the rotation of the arch member.

[0018] According to a second aspect of the present application, a method for measuring the elastic modulus of a material is provided, and the method is performed using the measuring instrument described in any of the above embodiments, comprising:

[0019] Clean the surface of the material to be tested, place the measuring instrument so that it is stably fixed on the surface of the material to be tested and return the reading of the measuring piece to zero;

[0020] The arched member is pulled to the top of the outer frame by using a traction rope, and the first end and the support are both located above the material to be tested;

[0021] The traction rope is loosened and the arched member falls along the height direction of the outer frame, and the first end hits the surface of the material to be tested. At this time, the support is fixed to the bottom of the outer frame;

[0022] Read the strain force value; calculate the elastic modulus of the material to be tested according to the force value of the first end and the cross-sectional area of ​​the first end.

[0023] In some embodiments, the force value of the first end includes the value of the concentrated force applied to the first end by the spring component and the magnetic component; the elastic modulus of the material to be tested is calculated as follows:

[0024] E = F / (A * ε);

[0025] Where E is the elastic modulus of the material to be tested, N / mm 2 ; A is the cross-sectional area of ​​the first end mm 2 ; F is the force applied by the first end, N; ε is the vertical deformation of the support, which is a dimensionless unit.

[0026] Compared with the related art, this application has the following technical effects:

[0027] The present application is a portable device, which can be conveniently used on site and has strong applicability; and the arch top strain of the arch member is used to amplify the vertical displacement of the support, thereby improving the measurement sensitivity of the measuring instrument; finally, the elastic modulus of the material to be tested is detected by the measuring instrument of the present application, and combined with the strength relationship of the material to be tested, the strength of the material to be tested can be deduced. Therefore, the present application can quickly obtain the elastic modulus of different materials, and then obtain the strength grade of the material based on the relationship between the strength and elastic modulus of different materials.

[0028] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0030] Figure 1 It is a structural schematic diagram of a portable material elastic modulus measuring instrument proposed in one embodiment of the present application;

[0031] Figure 2 This is a diagram of the arrangement position of the magnetic attraction member proposed in one embodiment of the present application;

[0032] Figure 3 is a schematic diagram of the connection between a spring member and an arch member proposed in another embodiment of the present application;

[0033] Figure 4 It is a schematic diagram of the installation of the outer frame and the measuring piece proposed in one embodiment of the present application;

[0034] Figure 5 It is a simplified force model diagram of an arch member proposed in one embodiment of the present application;

[0035] Figure 6 is a bending moment diagram of an arch member proposed in one embodiment of the present application;

[0036] Figure 7 is a force cloud diagram of an arch member proposed in another embodiment of the present application;

[0037] Figure 8 yes Figure 7 A top view of

[0038] In the figure, 1, outer frame; 2, arched part; 3, first end; 4, hole; 5, traction rope; 6, strain gauge; 7, support; 8, measuring part; 9, spring part; 10, magnetic part; 11, traction hole; 12, second end. DETAILED DESCRIPTION

[0039] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be construed as limiting the present application. On the contrary, the embodiments of the present application include all changes, modifications and equivalents that fall within the spirit and connotation of the appended claims.

[0040] like Figure 1 According to the first aspect of the present application, a portable material elastic modulus measuring instrument is proposed, including an outer frame 1, an arch member 2, a detection component and a rotating component; the following description is given by taking the outer frame 1 as having a height direction of up and down, a thickness direction of front and back, and a length direction of left and right as an example.

[0041] The outer frame 1 is open toward the bottom surface of the material to be tested; wherein the outer frame 1 is a hollow rectangular parallelepiped structure, which is open toward the bottom surface below the material to be tested, as shown in the example Figure 4 As shown, the outer frame 1 is five-sided closed, and only its bottom surface is an open structure. In addition, in some solutions, the top surface, left surface and right surface of the outer frame 1 are closed structures, and its front and back are semi-open structures, so that the arch 2 can move in the space that does not exceed the front and back of the outer frame 1.

[0042] The arch 2 is arranged in the outer frame 1 and has a first end 3 and a second end 12; the first end 3 and the second end 12 both face the material to be tested to form an arch with the top facing away from the material to be tested; the first end 3 is connected to the traction rope 5, and the traction rope 5 adjusts the position of the arch 2 relative to the outer frame 1; the second end 12 is fixed on the support 7, the support 7 is in contact and sliding connection with the inner side of the outer frame 1, and is fixed to the inner side of the outer frame 1 when the support 7 is located at the bottom of the outer frame 1.

[0043] The arch 2 has a first end 3 and a second end, the first end 3 and the second end 12 both have a set cross-sectional area, and the first end 3 and the second end 12 both face the material to be tested below the outer frame 1 to form an arch with the top facing upward, and the arch 2 is arranged in the outer frame 1. Figure 3 The arched member 2 is a semicircular arch, and its first end 3 is located on the left side of the outer frame 1. The first end 3 is connected to a traction rope 5, and the traction rope 5 is used to adjust the position of the arched member 2 relative to the outer frame 1, as shown in FIG. Figure 1 The first end 3 is provided with a hole 4, one end of the traction rope 5 passes through the hole 4, and the two are connected by bolts to adjust the size of the first end 3 beyond the arch 2, so as to achieve the load application on the surface of the material to be tested, and the other end of the traction rope 5 passes through the traction hole 11 formed on the top of the outer frame 1, and the traction rope 5 passes through the traction hole 11 to adjust the position of the arch 2. In addition, the arch 2 in the present application can adopt a non-circular arch structure, and adopt a right-angle "C" type, but the displacement sensitivity of the right-angle "C" type strain amplification support 7 is lower than that of a semicircular arch.

[0044] The second end 12 of the arch 2 is fixed on the support 7, wherein the support 7 is in contact and sliding connection with the inner side of the right side of the outer frame 1, and when the support 7 slides to the bottom of the right side of the outer frame 1, the support 7 can be fixed on the inner side of the outer frame 1. For example, the support 7 is at least partially made of metal material, and a magnetic attraction member 10 is provided at the inner bottom of the right side of the outer frame 1 to magnetically fix the support 7.

[0045] The detection component includes a strain piece and a measuring piece 8. The strain piece is arranged at the arch of the arch 2 to collect the maximum strain force of the arch of the arch 2. The measuring piece 8 is electrically connected to the strain piece and displays the strain force value collected by the strain piece.

[0046] The strain gauge is arranged at the top of the arch 2 and is located below the top surface of the outer frame 1. The strain gauge can collect the maximum strain force of the top of the arch 2 according to the deformation of the arch 2. The measuring element 8 is electrically connected to the strain gauge. Figure 4 The measuring member 8 shown is arranged on the top of the outer frame 1, and can display the strain force value collected by the strain member.

[0047] The rotating assembly is connected to the arch member 2 so that the first end head 3 can rotate in the thickness direction of the outer frame 1 .

[0048] The rotating assembly in this embodiment is connected to the arch member 2, which will obtain rotational acceleration in the initial stage of the measuring instrument and collide with the surface of the material to be measured when the first end 3 contacts the material to be measured. By reading the strain force value, the elastic modulus of the material to be measured is calculated according to the force value of the first end 3 and the cross-sectional area of ​​the first end 3.

[0049] Among them, a portable material elastic modulus measuring instrument is provided in this embodiment, which uses a traction rope 5 to pull the arch 2 to the top of the outer frame 1, and the first end 3 and the support 7 are both located above the material to be tested. At this time, the rotating component rotates the first end 3, and the first end 3 rotates in the front or rear direction of the outer frame 1; the traction rope 5 is relaxed, and the arch 2 falls along the height direction of the outer frame 1, and the first end 3 hits the surface of the material to be tested. At this time, the support 7 is fixed to the bottom of the outer frame 1, and is fixed by the support 7 to prevent the first end 3 from hitting the surface of the material to be tested. The entire arch 2 bounces up, the calculation model is simplified, the strain force value is read, and the elastic modulus of the material to be tested is calculated based on the force value of the first end 3 and the cross-sectional area of ​​the first end 3.

[0050] In some embodiments, the support 7 includes multiple linked flip parts, and the movement states of the multiple flip parts are exactly the same; the flip parts are perpendicular to or parallel to the magnetic part 10, and when the flip parts are parallel to the magnetic part 10, the side facing the magnetic part 10 is made of metal material, so as to realize the magnetic attraction of the magnetic part 10 to fix the support 7.

[0051] The support 7 includes a plurality of linked flipping members, wherein the plurality of flipping members are perpendicular or parallel to the magnetic attraction member 10. Figure 2As shown, the motion states of all flipping parts are exactly the same, that is, all flipping parts are perpendicular to the magnetic part 10 or all flipping parts are parallel to the magnetic part 10. When the flipping part is parallel to the magnetic part 10, the side facing the magnetic part 10 is made of metal material to realize the magnetic attraction of the magnetic part 10 to the fixed support 7. That is, as can be seen from the above content, when the measuring instrument is testing, the arch part 2 is first pulled to the top of the outer frame 1 by the traction rope 5, and then the first end 3 is rotated by the rotating assembly. At this time, the second end 12 is still fixed on the bracket, and the second end 12 cannot rotate with the rotation of the first end 3, causing the deformation of the arch part 2; then relax the traction rope 5. In this process, all flipping parts are perpendicular to the magnetic part 10. When the flipping part is perpendicular to the magnetic part 10, the flipping part is not attracted by the magnetic force of the magnetic part 10, and the traction rope 5 can be used to easily flip it. The above process is completed by the parts. When the traction rope 5 is relaxed, the bracket is restricted by the right side of the outer frame 1, and the arched part 2 performs free fall downward along the up and down direction. However, when the first end 3 contacts the surface of the material to be tested, it uses the deformation given by the rotating component in the initial stage to obtain rotational acceleration, and can hit the surface of the material to be tested. When the first end 3 hits the surface of the material to be tested, the flip part linkage is all parallel to the magnetic suction part 10, and the metal material in the flip part faces one side of the magnetic suction part 10, so that the magnetic suction part 10 is magnetically fixed to the support 7. For example, the support 7 can be a louver support 7, and the linkage principle of its flip part is the same as that of the blinds, which will not be repeated.

[0052] Therefore, in this embodiment, when the arch 2 reaches the set position, the magnetic member 10 will attract the support 7 to fix the support 7, so that the first end 3 can be subjected to the reaction force when it hits the material to be tested, and strain is generated at the arch of the arch 2, thereby reflecting the force of the first end 3. In addition, when the measuring instrument is usually portable, the magnetic member 10 can fix the arch 2 and prevent it from rotating, which is convenient for carrying.

[0053] In some embodiments, the strain element includes two strain gauges 6 with set resistance values, and the two strain gauges 6 are configured in a Wheatstone half-bridge configuration.

[0054] The strain gauge 6 includes two strain gauges 6, and the strain gauge 6 has a set resistance value. For example, the resistance value of the strain gauge 6 is 350Ω. The two strain gauges 6 are arranged on the arch of the arch 2, and a Wheatstone half bridge is adopted. Figure 3 It should be noted that the strain gauge 6 is arranged at the arch of the arch 2, where the strain is at its maximum position; the simplified stress model of the first end 3 and its stress bending moment diagram are shown in Figure 5 and Figure 6 As shown, finite element analysis is performed based on the simplified stress model to calculate the maximum strain position of the arch member 2 along the arch direction. The finite element cloud diagram is shown in Figure 7-Figure 8As shown. According to the force cloud diagram of the semicircular arch, the strain change in the span direction of the second end 12 of the arch 2 is the largest. For this reason, the collection position of the strain gauge 6 is set between 0 and 20 degrees from the fixed end of the arch, so as to reflect the vertical deformation of the support 7. The strain gauge 6 uses a Wheatstone half bridge to avoid the error of the external environment on the strain collection.

[0055] In some embodiments, the rotating assembly includes a spring member 9, which is arranged on the outer frame 1, and its extension direction is the same as the thickness direction of the outer frame 1; the spring member 9 is connected to the arch member 2 through a long arm contact, and the spring member 9 is compressed when the arch member 2 rotates.

[0056] Wherein, the rotating assembly includes a spring member 9, for example, the spring member 9 is a spring, which is arranged on the outer frame 1, and its extension direction is the same as the thickness direction of the outer frame 1. In other words, the spring is arranged at the bottom of the top surface of the outer frame 1, and the spring extends in the front-to-back direction, and one end thereof is contacted and connected between the arch of the arch member 2 and the first end 3 through a long arm, wherein the spring is compressed when the arch member 2 rotates. For example, when the measuring instrument performs detection, when the arch member 2 rotates, the spring will be retracted forward, thereby applying a force to the arch member 2, and the arch member 2 can be restricted by the outer frame 1 to produce a rotation restriction, thereby achieving the effect of fixing the support 7. In some embodiments, the rotating assembly includes a spring member 9, and the spring that can be manually pulled can also use an electric driving device to rotate the arch member 2 to replace the rotating assembly scheme in this embodiment. This is common knowledge in the art and will not be repeated.

[0057] In some embodiments, a groove is provided on the arch member 2 at the connection between the long arm and the arch member 2 to prevent the spring member 9 from affecting the rotation of the arch member 2 .

[0058] That is, a groove is provided on the arch member 2 at the connection between the long arm and the arch member 2, the purpose of which is that the spring member 9 only applies force without affecting the rotation of the arch member 2, so as to facilitate on-site operation and measurement of the material to be tested.

[0059] According to a second aspect of the present application, a method for measuring the elastic modulus of a material is provided, and the method is performed using the measuring instrument in any of the above embodiments, comprising:

[0060] S1: clean the surface of the material to be tested, place the measuring instrument so that it is stably fixed on the surface of the material to be tested and return the reading of the measuring piece 8 to zero;

[0061] S2: Use the traction rope 5 to pull the arch 2 to the top of the outer frame 1, and the first end 3 and the support 7 are both located above the material to be tested;

[0062] S3: loosen the traction rope 5 and let the arched member 2 fall along the height direction of the outer frame 1, and the first end 3 hits the surface of the material to be tested. At this time, the support 7 is fixed at the bottom of the outer frame 1;

[0063] S4: Read the strain value; calculate the elastic modulus of the material to be tested according to the force value of the first terminal 3 and the cross-sectional area of ​​the first terminal 3.

[0064] Among them, in step S1, the surface of the material to be measured is cleaned to avoid the presence of debris at the stress-bearing point; then the measuring instrument is placed to be stably fixed on the surface of the material to be measured, and the strain collection reading of the measuring piece 8 is reset to zero.

[0065] In step S2 , the connection between the first end 3 and the hole 4 is adjusted so that the first end 3 is higher than the bottom surface of the outer frame 1 , and the arch 2 is pulled to the top of the outer frame 1 using the traction rope 5 .

[0066] In step S3 , the traction rope 5 is then loosened to allow the first end 3 to hit the surface of the material to be tested. At this time, the support 7 is fixed to the bottom of the outer frame 1 .

[0067] In step S4, the maximum value of the dome strain is read; the elastic modulus of the material to be tested is calculated according to the force value of the first terminal 3 and the cross-sectional area of ​​the first terminal 3; wherein the force value of the first terminal 3 is the value of the concentrated force applied by the spring and the magnetic attraction member 10 to the second terminal 12 according to the factory inspection of the equipment. The simplified force model of the first terminal 3 and its bending moment diagram are as follows: Figure 5 and Figure 6 As shown, the bending moment of the arch 2 can be calculated based on the simplified force model, so that the cross-sectional strain of the arch 2 can be obtained through the properties of the material to be measured. In this embodiment, the strain gauge 6 is set according to the maximum strain position of the arch 2, so as to reflect the vertical deformation of the support 7, and the elastic modulus of the measured material is calculated according to the following formula.

[0068] E = F / (A * ε);

[0069] Where E is the elastic modulus of the material to be tested, N / mm 2 ; A is the cross-sectional area of ​​the first end 3, mm 2 ; F is the force applied by the first end 3, N; ε is the vertical deformation of the support 7, which is a dimensionless unit.

[0070] It should be noted that, in the description of this application, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0071] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0072] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0073] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A portable material elastic modulus measuring instrument, characterized in that: include Frame; It is open toward the bottom surface of the material to be tested; Arched pieces; It is arranged in the outer frame and has a first end and a second end; the first end and the second end both form an arch shape with the arch tip facing away from the material to be tested; the first end adjusts its position relative to the outer frame through a traction rope; the second end is fixed on a support, the support is in contact and sliding connection with the inner side of the outer frame, and is fixed to the inner side of the outer frame when the support is located at the bottom of the outer frame; A detection component comprising a strain member and a measuring member, wherein the strain member is arranged at the arch of the arch member to collect the strain force of the arch of the arch member; The measuring piece is electrically connected to the strain piece and displays the strain force value collected by the strain piece; as well as A rotating assembly is connected to the arch member so as to enable the first end to rotate in the thickness direction of the outer frame.

2. The measuring instrument according to claim 1, characterized in that: The support is at least partially made of metal material, and a magnetic attraction member is arranged at the inner bottom of the support facing the outer frame to magnetically fix the support.

3. The measuring instrument according to claim 2, characterized in that: The support includes multiple linked flip parts, and the movement states of the multiple flip parts are exactly the same; the flip parts are perpendicular to or parallel to the magnetic parts, and when the flip parts are parallel to the magnetic parts, the side facing the magnetic parts is made of metal material, so that the magnetic parts can magnetically fix the support.

4. The measuring instrument according to claim 3, characterized in that: A traction hole is provided on the top of the outer frame, and the traction rope passes through the traction hole to adjust the position of the arched member.

5. The measuring instrument according to any one of claims 1 to 4, characterized in that: The strain member comprises two strain gauges with set resistance values, and the two strain gauges are arranged in a Wheatstone half bridge configuration.

6. The measuring instrument according to claim 5, characterized in that The resistance value of the strain gauge is 350Ω.

7. The measuring instrument according to claim 5, characterized in that: The rotating assembly includes a spring member, which is arranged on the outer frame and has an extension direction that is the same as the thickness direction of the outer frame; the spring member is in contact with and connected to the arch member through a long arm, and the arch member compresses the spring member when it rotates.

8. The measuring instrument according to claim 7, characterized in that: A groove is provided on the arched member at the connection between the long arm and the arched member to prevent the spring member from affecting the rotation of the arched member.

9. A method for measuring the elastic modulus of a material, characterized in that: Measuring using the measuring instrument described in any one of claims 1 to 8 comprises: Clean the surface of the material to be tested, place the measuring instrument so that it is stably fixed on the surface of the material to be tested and return the reading of the measuring piece to zero; The arched member is pulled to the top of the outer frame by using a traction rope, and the first end and the support are both located above the material to be tested; The traction rope is loosened and the arched member falls along the height direction of the outer frame, and the first end hits the surface of the material to be tested. At this time, the support is fixed to the bottom of the outer frame; Read the strain force value; calculate the elastic modulus of the material to be tested according to the force value of the first end and the cross-sectional area of ​​the first end.

10. The measuring method according to claim 9, characterized in that: The force value of the first end includes the value of the concentrated force applied to the first end by the spring component and the magnetic component; the calculation formula of the elastic modulus of the material to be tested is as follows: E = F / (A * ε); Where E is the elastic modulus of the material to be tested, N / mm 2 ; A is the cross-sectional area of ​​the first end mm 2 ; F is the force applied by the first end, N; ε is the vertical deformation of the support.

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