Young modulus experimental device with adjustable lens-ruler distance

Abstract

The utility model discloses a Young modulus experimental device with an adjustable lens-ruler distance. The device comprises two symmetrically-arranged stand columns and a platform which is fixedly or slidably arranged on the stand columns. The optical lever plane mirror is rotationally arranged on the platform; the movable cross beam is located above the platform and is fixedly or slidably arranged on the stand columns; the light-emitting scale is horizontally arranged on the movable cross beam, scales of the light-emitting scale face the optical lever plane mirror, and the increasing direction of scale values of the light-emitting scale is perpendicular to a rotating shaft of the optical lever plane mirror in a different-plane mode; the telescope is arranged right in front of the platform and is as high as a rotating shaft of the optical lever plane mirror; at least one of the platform and the movable cross beam is arranged on the stand column in a sliding mode. The lens-ruler distance of the experimental device can be adjusted through the mobile platform or / and the mobile cross beam. According to the product, richer tensile load can be applied to a material in the measurement experiment process, richer elastic deformation measurement materials are provided, and the designable observation research content of a traditional experiment is expanded.

Description

Technical Field

[0001] The utility model relates to the technical field of Young's modulus measurement, in particular to an experimental device for measuring Young's modulus with adjustable mirror scale distance. Background Technique

[0002] Solid materials will deform under the action of external forces. Different shaped objects have different ways of deforming. For example, rod-shaped and filamentous objects will elongate or shorten after being stretched or squeezed by external forces. When the deformation does not exceed a certain limit, the external force is removed and the deformation will disappear accordingly. This phenomenon is called elastic deformation. When an object undergoes elastic deformation, internal stress will be generated to restore its original shape. Young's modulus is a physical quantity that reflects the relationship between material deformation and internal stress, and is also a physical quantity that reflects the rigidity of the material. The Young's modulus measurement experiment is an essential project in the basic experimental teaching of college physics. In experimental teaching, the teaching purpose of this measurement experiment is to help students intuitively feel the relationship between the deformation and internal stress change of the experimental material (usually a metal wire).

[0003] The basic content design of the existing Young's modulus measurement experiment is the same, that is, to measure the Young's modulus of a metal wire using a Young's modulus measuring instrument. According to the different arrangements of the metal wire, the experimental measuring instrument can be divided into a tensile type, a beam bending type, and a suspension type, among which the tensile type is the most used. The basic structure of the tensile type Young's modulus measuring instrument is to amplify the small angle of rotation of the optical lever mirror and reflect it as the linear displacement of the scale. Mainly, the two front feet of the optical lever are placed on the fixed platform of the experimental device, and the rear foot is placed on the measurement end face of the metal wire to be measured. When the metal wire is stressed and undergoes a small elongation, the optical lever rotates a small angle around the front feet, thereby driving the optical lever mirror to rotate a corresponding small angle. In this way, the image of the scale is reflected between the optical lever mirror and the adjustment mirror, and this small angular displacement is amplified into a larger linear displacement.

[0004] Patent Publication No. CN 212342118 U discloses an experimental device for measuring the Young's modulus of a metal wire, including a gantry and a telescope support; the parallel connecting rods of the gantry are sequentially connected with a top plate, a light lever support plate and a first base; the top end of the metal wire is connected to the top plate, the middle part is connected with a metal wire clamping table, and the bottom end is connected with a weight; a reflecting mirror is fixedly arranged at the front end of the light lever, and the rear feet are fixed at the rear end. A rotating shaft is fixedly arranged at the bottom end of the reflecting mirror, and the rotating shaft is rotationally connected with both ends of the light lever support plate through bearings; a coaxial annular magnet is fixedly arranged at one end of the rotating shaft, and a magnetic encoder circuit board matched with the annular magnet is fixedly arranged on the light lever support plate; a telescope and a scale matched with the reflecting mirror are arranged on the telescope support. This product uses a magnetic encoder to measure and calculate the Young's modulus on the basis of the basic structure of a tensile Young's modulus measuring instrument, so as to verify the accuracy of the students' detection data and reduce the data error of the experiment. Patent Publication No. CN209148450U discloses a digital display short-distance Young's modulus measuring device, including a base cross beam fixedly connected to the upper part of the base, the lower ends of two columns are respectively fixedly connected to the base cross beam, and the upper ends are respectively fixedly connected to the upper cross beam. The tensioner cross beam is fixedly connected to the lower parts of the two columns. The light lever support plate is located above the tensioner cross beam and is fixedly connected to the two columns. The chuck assembly is fixedly connected to the upper part of the upper cross beam. The upper end of the steel wire is fixedly connected to the chuck assembly, and the lower end is fixedly connected to the tension sensor assembly. The lower end of the tension sensor assembly is fixedly connected to the tensioner cross beam. The light lever is fixedly connected to the light lever support plate, and the backlight illumination scale assembly is fixedly connected to the lower part of the upper cross beam. This product also directly displays the tension with a tension sensor on the basis of retaining the basic structure of the tensile Young's modulus measuring instrument, improving the reliability of reading.

[0005] Based on the basic measuring instrument, the improvement ideas of the prior art mainly focus on the problem of the accuracy of reading during the measurement process, and the product structure always retains the design concept of the fixed distance between the backlight illumination scale assembly and the light lever support plate. This makes it usually necessary to change the optical lever constant D to change the magnification w of the optical lever (w = 2H / D) in the experiment, which to a certain extent limits the experimental content of the Young's modulus instrument. Summary of the Invention

[0006] In view of the deficiencies of the prior art, the present utility model provides a Young's modulus experimental device with adjustable mirror-scale distance. This experimental device can not only adjust the optical lever constant D, but also realize the adjustable mirror-scale distance. During the experiment, through the combined adjustment of the two, the experimental content of college physics is enriched to a certain extent.

[0007] The technical solution adopted by the present utility model is:

[0008] A Young's modulus experimental device with adjustable mirror-scale distance, including:

[0009] A vertical frame;

[0010] A wire, one end of which is fixed to the upper part of the upright frame, and the other end is fixed to the lower part of the upright frame through a force applying mechanism;

[0011] A light lever plane mirror, located near the wire and arranged at a preset position along the stretching direction of the wire, where the preset position is a position within the space where the wire is located in its length direction;

[0012] A light-emitting scale, located above the light lever plane mirror, with its scale facing the light lever plane mirror, and the direction of the scale value sorting is skew perpendicular to the axis of rotation of the light lever plane mirror;

[0013] A telescope, adaptively arranged with the axis of rotation of the light lever plane mirror;

[0014] Wherein, the distance between the light lever plane mirror and the light-emitting scale is adjustable.

[0015] In the Young's modulus experiment device with adjustable mirror-scale distance disclosed in the present application, the upright frame includes two symmetrically arranged columns and a base for enabling the columns to stand upright;

[0016] The experimental device further includes:

[0017] A platform, fixedly or slidably arranged on the columns; the light lever plane mirror is rotatably arranged on the platform;

[0018] A moving crossbeam, located above the platform, fixedly or slidably arranged on the columns; the light-emitting scale is horizontally arranged on the moving crossbeam;

[0019] Wherein, at least one of the platform and the moving crossbeam is slidably arranged on the columns.

[0020] In the Young's modulus experiment device with adjustable mirror-scale distance disclosed in the present application, both ends of the moving crossbeam are sleeved on the columns, and a first locking screw is arranged thereon. By rotating the first locking screw, the moving crossbeam can slide up and down or be fixed on the columns.

[0021] In the Young's modulus experiment device with adjustable mirror-scale distance disclosed in the present application, both ends of the platform are sleeved on the columns, and a second locking screw is arranged thereon. By rotating the second locking screw, the platform can slide up and down or be fixed on the columns.

[0022] In the Young's modulus experiment device with adjustable mirror-scale distance disclosed in the present application, the experimental device further includes:

[0023] A top crossbeam, fixedly arranged at the top of the columns, and a first fixture hole is arranged thereon;

[0024] The upper chuck is arranged inside the first fixture hole;

[0025] The lower chuck, a second fixture hole is arranged on the platform, and the lower chuck is arranged inside the second fixture hole;

[0026] Wherein, a hole for the metal wire to pass through is formed on the moving crossbeam, the metal wire passes through the hole, one end of which is clamped by the upper chuck and the other end is clamped by the lower chuck;

[0027] The force applying mechanism is located below the platform, and its upper end is connected to the lower chuck.

[0028] In the apparatus for Young's modulus experiment with adjustable mirror-scale distance disclosed in the present application, the force applying mechanism includes a tension sensor and an element capable of applying a force to the metal wire. The upper end of the tension sensor is connected to the lower chuck, and its lower end is connected to the element. Further, the element may be a screw.

[0029] In the apparatus for Young's modulus experiment with adjustable mirror-scale distance disclosed in the present application, the force applying mechanism further has:

[0030] A fixing plate, located below the tension sensor, is fixedly arranged on the column;

[0031] A nut is arranged below the fixing plate, and the screw passes through the fixing plate and is connected to the nut; wherein, the screw and the fixing plate are designed to be anti-rotationally engaged, and the metal wire can be forced or unforced by rotating the nut.

[0032] In the apparatus for Young's modulus experiment with adjustable mirror-scale distance disclosed in the present application, the force applying mechanism further includes a dynamometer, and the dynamometer is electrically connected to the tension sensor.

[0033] The beneficial effects of the present utility model are as follows: (1) In the apparatus for Young's modulus experiment of the present utility model, the platform is fixedly or slidably arranged on the column, the moving crossbeam is fixedly or slidably arranged on the column, the optical lever plane mirror is arranged on the platform, and the luminous scale is arranged on the moving crossbeam. At least one of the platform and the moving crossbeam is slidably arranged on the column. By moving the platform or / and the moving crossbeam, the mirror-scale distance of the experimental apparatus can be adjusted, enriching the content of school physics experiments, and being able to explore the applicable conditions of the optical lever magnification formula, broadening the thinking of students. (2) The improvement concept of the prior art for the traditional tensile Young's modulus measuring instrument has always focused on solving the problems of reading accuracy and efficiency, without considering how to expand the display of the "elastic deformation" of materials by improving the structure between the main working parts of the product. This technical solution makes it possible to apply more diverse tensile loads to the material during the measurement experiment by adding the technical feature of adjustable mirror-scale distance, thereby providing more diverse measurement materials for elastic deformation, and expanding the observable research content that can be designed for traditional experiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0035] Figure 1 Structural schematic of the Young's modulus experimental device with adjustable mirror-to-scale distance of the present application Figure 1 。

[0036] Figure 2 Structural schematic of the Young's modulus experimental device with adjustable mirror-to-scale distance of the present application Figure 2 。

[0037] Figure 3 Structural schematic of the Young's modulus experimental device with adjustable mirror-to-scale distance of the present application Figure 3 。

[0038] The reference numerals are as follows:

[0039] 1, vertical column; 2, platform; 21, second locking screw; 22, second fixture hole; 3, optical lever plane mirror; 4, moving crossbeam; 41, first locking screw; 42, hole; 5, luminous scale; 6, telescope; 7, top crossbeam; 71, first fixture hole; 8, metal wire; 9, force application mechanism; 91, fixing plate; 92, nut; 93, tension sensor; 94, tensiometer; 95, display screen; 96, screw. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] In the following text, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the embodiments of the present utility model application. Therefore, the drawings and the description are considered to be exemplary in nature rather than restrictive.

[0041] The terms "comprising" and "having" and any variations thereof in the present application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products or devices.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality of" means two or more unless otherwise specifically defined.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this utility model belongs. The terms used in the description of the present utility model herein are for the purpose of describing specific embodiments only and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0044] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive of other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0045] The embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

[0046] In most existing experimental teaching instruments for measuring Young's modulus of metal wires by the optical lever method, the mirror scale distance H (the distance from the luminous scale to the axis of rotation of the optical lever plane mirror) is fixed and non-adjustable. In this case, only by changing the optical lever constant D can the magnification w of the optical lever be changed (w = 2H / D). However, in fact, in addition to the optical lever constant D, the mirror scale distance H also determines the magnification. If the optical lever constant D and the mirror scale distance H can be adjusted comprehensively, the experimental content will be enriched to a certain extent.

[0047] Based on this, the embodiments of this application provide a Young's modulus experimental device with adjustable mirror scale distance, and the main purpose is to solve the technical problem that the mirror scale distance of the existing Young's modulus experimental instrument is non-adjustable, and only by changing the optical lever constant D can the magnification w of the optical lever be changed, thereby limiting the experimental content of the Young's modulus instrument.

[0048] A Young's modulus experimental device with adjustable mirror scale distance disclosed in this application includes:

[0049] An upright frame;

[0050] A metal wire 8, one end of which is fixed to the upper part of the upright frame, and the other end is fixed to the lower part of the upright frame through a force application mechanism 9;

[0051] The optical lever plane mirror 3 is located near the metal wire 3 and is arranged at a preset position along the stretching direction of the metal wire 8. The preset position is a position in the space where the metal wire 3 is located in its length direction.

[0052] The luminous scale 5 is located above the optical lever plane mirror 3, its scale faces the optical lever plane mirror 3, and the direction of the scale value sorting is skew perpendicular to the rotation axis of the optical lever plane mirror 3.

[0053] The telescope 6 is adaptively set with the rotation axis of the optical lever plane mirror 3, so that the scale value on the luminous scale 5 can be seen in the telescope 6 through the reflection of the optical lever plane mirror 3.

[0054] Among them, the distance between the optical lever plane mirror 3 and the luminous scale 5 is adjustable.

[0055] Define the distance between the rotation axis of the optical lever plane mirror 3 and the plane where the scale of the luminous scale 5 is located as the mirror-scale distance. This experimental device can realize the adjustable mirror-scale distance, enriching the content of college physics experiments and broadening the thinking of students.

[0056] In a specific embodiment, please refer to Figures 1 to 3 As shown, the stand includes two symmetrically arranged columns 1 and a base for enabling the columns 1 to stand upright. The experimental device further includes:

[0057] The platform 2 is fixedly or slidably arranged on the column 1, and the optical lever plane mirror 3 is rotatably arranged on the platform 2;

[0058] The moving crossbeam 4 is located above the platform 2, and it is fixedly or slidably arranged on the column 1. The luminous scale 5 is horizontally arranged on the moving crossbeam 4.

[0059] Among them, at least one of the platform 2 and the moving crossbeam 4 is slidably arranged on the column 1, so as to realize the adjustable mirror-scale distance of the foregoing scheme.

[0060] In one embodiment, please refer to Figure 1 As shown, the platform 2 is fixedly arranged on the column 1, and the moving crossbeam 4 is slidably arranged on the column 1. Since the luminous scale 5 is arranged on the moving crossbeam 4, the mirror-scale distance can be adjusted when the moving crossbeam 4 slides on the column 1.

[0061] In another embodiment, please refer to Figure 2 As shown, the platform 2 is slidably arranged on the column 1, and the moving crossbeam 4 is fixedly arranged on the column 1. Since the optical lever plane mirror 3 is arranged on the platform 2, the mirror-scale distance can be adjusted when the platform 2 slides on the column 1.

[0062] In another embodiment, please refer to Figure 3As shown, the platform 2 is slidably arranged on the column 1, and the moving cross beam 4 is also slidably arranged on the column 1. When the platform 2 or / and the moving cross beam 4 slide on the column 1, the mirror scale distance can also be adjusted.

[0063] In the common scenarios of the foregoing embodiments, please refer to Figure 1 、 3 As shown, both ends of the moving cross beam 4 can be sleeved on the column 1, and a first locking screw 41 is arranged thereon. By tightening the first locking screw 41, the moving cross beam 4 can be fixed on the column 1; correspondingly, by loosening the first locking screw 41, the moving cross beam 4 can slide up and down on the column 1 to adjust the mirror scale distance. When the appropriate mirror scale distance is adjusted, by tightening the first locking screw 41, the moving cross beam 4 can be fixed on the column 1.

[0064] In a specific embodiment, please refer to Figure 2 、 3 As shown, both ends of the platform 2 can be sleeved on the column 1, and a second locking screw 21 is arranged thereon. By tightening the second locking screw 21, the platform 2 can be fixed on the column 1, and by loosening the second locking screw 21, the platform 2 can slide up and down on the column 1 to adjust the mirror scale distance. When the appropriate mirror scale distance is adjusted, by tightening the second locking screw 21, the platform 2 can be fixed on the column 1.

[0065] The experimental device disclosed in this application further includes a top cross beam 7, an upper chuck and a lower chuck. Please refer to Figures 1 to 3 As shown, the top cross beam 7 is fixedly arranged at the top end of the column 1, and a first fixture hole 71 is arranged thereon. The upper chuck (not shown in the figure) is arranged in the first fixture hole 71, and the top cross beam 7 is used to limit the movement range of the upper chuck and bear the force. A second fixture hole 22 is arranged on the platform 2, and the lower chuck (not shown in the figure) is arranged in the second fixture hole 22. Among them, a hole 42 for the metal wire 8 to pass through is formed on the moving cross beam 4. The metal wire 8 passes through the hole 42, its upper end is clamped by the upper chuck, and its lower end is clamped by the lower chuck. Both the upper and lower chucks clamp the metal wire 8 to prevent the metal wire 8 from slipping relative to the chuck during the force application process. The force application mechanism 9 is located below the platform 2, and its upper end is connected to the lower chuck for applying a force to the metal wire 8 to increase the elongation of the metal wire 8.

[0066] In a specific embodiment, please refer to Figures 1 to 3 As shown, the force application mechanism 9 has a tension sensor 93. The upper end of the tension sensor 93 is connected to the lower chuck, and its lower end is connected to a screw rod 96. The tension sensor 93 is used to detect the force applied to the metal wire 8.

[0067] In a specific embodiment, the force applying mechanism 9 further has a fixing plate 91 and a nut 92. The fixing plate 91 is located below the tensile force sensor 93 and is fixedly arranged on the column 1. The nut 92 is arranged below the fixing plate 91, and the screw rod 96 passes through the fixing plate 91 and is connected to the nut 92; wherein, the screw rod 96 and the fixing plate 91 are designed to be anti-rotationally engaged, and the force on the metal wire 8 can be increased or decreased by rotating the nut 92.

[0068] In a specific embodiment, the force applying mechanism 9 further includes a dynamometer 94, and the dynamometer 94 is electrically connected to the tensile force sensor 93. A display screen 95 is arranged on the dynamometer 94. The tensile force sensor 93 is connected to the dynamometer 94 and supplies power to the dynamometer 94, and the value of the force applied to the metal wire 8 is displayed on the display screen.

[0069] The working mode of the Young's modulus experiment device with adjustable mirror scale distance of the present utility model.

[0070] Before the experiment, it should be ensured that the upper chuck and the lower chuck both clamp the metal wire 8 to prevent relative slippage between the metal wire 8 and the chuck during the force application process. Power on the luminous scale 5 to light it up. The tensile force sensor 93 is connected to the dynamometer 94 and supplies power to the dynamometer 94 for preheating. The value of the force applied to the metal wire 8 at this time is displayed on the display screen 95 of the dynamometer 94. Adjust the telescope 6 to be at the same height as the axis of rotation of the optical lever flat mirror 3, and rotate the optical lever flat mirror 3, and adjust the telescope 6 in combination to see clearly the scale lines on the luminous scale 5. Keep the mirror scale distance unchanged, and then measure the corresponding scale readings x under multiple different tensile forces m. Use a steel tape measure to measure the mirror scale distance H and the original length L of the metal wire 8, use a micrometer to measure the diameter d of the metal wire 8, and use a vernier caliper to measure the optical lever constant D.

[0071] According to the Young's modulus formula by the stretching method, there is: , draw the m-x relationship curve, then the Young's modulus of the metal wire 8 , where k is the linear fitting slope of the m-x relationship curve. By moving the platform 2 or / and the moving cross beam 4 to change the mirror scale distance H, repeating the above steps, it will be found that when H is relatively large, E basically does not change with the change of H, but when H is relatively small, E will change with the change of H. This is mainly because when H is relatively small, the optical lever magnification formula w = 2H / D no longer holds. Through this improvement, students can more deeply realize that they cannot simply apply the formula and need to understand the applicable conditions and requirements for measuring minute deformations by the optical lever stretching method.

[0072] Based on the above embodiments, the Young's modulus experiment device with adjustable mirror scale distance of the embodiments of the present utility model has the following advantages: The structure of this experiment device is simple, easy to use, can realize adjustable mirror scale distance, enriches the content of physical experiments, and broadens the thinking of students.

[0073] The specific idea is as follows: The platform 2 of the experimental device is fixedly or slidably arranged on the column 1, the moving crossbeam 4 is fixedly or slidably arranged on the column 1, the optical lever plane mirror 3 is arranged on the platform 2, the luminous scale 5 is arranged on the moving crossbeam 4, and at least one of the platform 2 and the moving crossbeam 4 is slidably arranged on the column 1. By moving the platform 2 or / and the moving crossbeam 4, the mirror-to-scale distance of the experimental device can be adjusted, which not only enriches the content of physical experiments, but also enables the exploration of the applicable conditions of the optical lever magnification formula and broadens the thinking of students.

[0074] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A Young's modulus experimental device with adjustable mirror distance, characterized in that: include: Stand; A metal wire (8), one end of which is fixed to the upper end of the frame, and the other end of which is fixed to the lower end of the frame via a force-applying mechanism (9); An optical lever plane mirror (3) is located near the metal wire (8) and is arranged at a preset position along the stretching direction of the metal wire (8), wherein the preset position is a position of the metal wire (8) in the space in which the metal wire (8) is located in the length direction thereof; A luminous scale (5) is located above the optical lever plane mirror (3), its scale is oriented toward the optical lever plane mirror (3), and the direction in which its scale values ​​are arranged is skewed and perpendicular to the rotation axis of the optical lever plane mirror (3); A telescope (6) adapted to be arranged on the rotation axis of the optical lever plane mirror (3); Wherein, the distance between the optical lever plane mirror (3) and the luminous scale (5) is adjustable.

2. The Young's modulus experimental device with adjustable mirror distance according to claim 1, characterized in that: The stand comprises two symmetrically arranged columns (1) and a base enabling the columns (1) to stand upright; The experimental device also includes: The platform (2) is fixedly or slidably arranged on the column (1); the optical lever plane mirror (3) is rotatably arranged on the platform (2); A movable crossbeam (4) is located above the platform (2) and is fixedly or slidably arranged on the column (1); the luminous scale (5) is horizontally arranged on the movable crossbeam (4); Wherein, at least one of the platform (2) and the movable crossbeam (4) is slidably arranged on the column (1).

3. The Young's modulus experimental device with adjustable mirror distance according to claim 2, characterized in that: Both ends of the movable crossbeam (4) are sleeved on the upright column (1), and a first locking screw (41) is provided thereon. By rotating the first locking screw (41), the movable crossbeam (4) can slide up and down or be fixed on the upright column (1).

4. The Young's modulus experimental device with adjustable mirror distance according to claim 2, characterized in that: Both ends of the platform (2) are sleeved on the column (1), and a second locking screw (21) is provided on the column. By rotating the second locking screw (21), the platform (2) can slide up and down or be fixed on the column (1).

5. The Young's modulus experimental device with adjustable mirror distance according to claim 2, characterized in that: The experimental device also includes: A top crossbeam (7) fixedly arranged on the top of the column (1), and having a first clamp hole (71) arranged thereon; An upper clamp, disposed in the first clamp hole (71); A lower clamping head, wherein a second clamping hole (22) is provided on the platform (2), and the lower clamping head is arranged in the second clamping hole (22); The movable crossbeam (4) is provided with a hole (42) for the metal wire (8) to pass through. The metal wire (8) passes through the hole (42), with one end of the metal wire (8) being clamped by the upper clamp and the other end of the metal wire (8) being clamped by the lower clamp; The force-applying mechanism (9) is located below the platform (2), and its upper end is connected to the lower clamp.

6. The Young's modulus experimental device with adjustable mirror distance according to claim 5, characterized in that: The force-applying mechanism (9) comprises a tension sensor (93) and an element capable of applying force to the metal wire (8); the upper end of the tension sensor (93) is connected to the lower clamp, and the lower end of the tension sensor (93) is connected to the element.

7. The Young's modulus experimental device with adjustable mirror distance according to claim 6, characterized in that: The element is a screw (96).

8. The Young's modulus experimental device with adjustable mirror distance according to claim 7, characterized in that: The force adding mechanism (9) further comprises: A fixing plate (91), located below the tension sensor (93) and fixedly mounted on the column (1); The nut (92) is arranged below the fixing plate (91), and the screw rod (96) passes through the fixing plate (91) and is connected to the nut (92). By rotating the nut (92), the force of the metal wire (8) can be increased or decreased.

9. The Young's modulus experimental device with adjustable mirror distance according to claim 6, characterized in that: The force applying mechanism (9) further comprises a tension meter (94), and the tension meter (94) is electrically connected to the tension sensor (93).

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