Platform of three-line pendulum experimental device for measuring rotational inertia and use method of platform

Abstract

The invention discloses a platform of a three-line pendulum experiment device for measuring rotational inertia and a use method thereof, and belongs to the technical field of physical experiment equipment, and the platform comprises a finish machining disc for placing a measured object, a lower support fixedly installed at the bottom of the finish machining disc, and an upper support located above the finish machining disc. The lower bracket is in hoisting connection with the upper bracket through a cycloid; and the tail end of the lower bracket is in threaded connection with an adjusting screw. Balance is regulated and controlled in a targeted mode by changing variables such as the number, the position and the screwing-in depth of the adjusting screws, the mode that balance is adjusted through the adjusting screws can be flexibly adjusted according to actual needs, operation is easy and convenient, meanwhile, the adjusting degree can be accurately quantified, and the platform leveling efficiency is greatly improved; and the threaded connection mode enables the adjusting screw to have high stability, and the adjusting screw does not displace in the measurement process, so that the introduction of measurement errors is avoided.

Description

Technical Field

[0001] The invention mainly relates to the technical field of physical experimental equipment, in particular to a platform of a three-wire pendulum experimental device for measuring the moment of inertia and a use method thereof. Background Art

[0002] In the prior art, the three-wire pendulum method is a common method for measuring the moment of inertia of an object. During the measurement process, the traditional three-wire pendulum device often needs to add wooden blocks to maintain the balance of the object. However, this method has many defects, such as the location and number of wooden blocks to be added require repeated trials and adjustments, which is cumbersome and time-consuming; the stability of the wooden blocks is poor and they are prone to displacement during the measurement process, thereby introducing measurement errors; due to the size and shape limitations of the wooden blocks, precise balance adjustment cannot be achieved, which affects the accuracy of the measurement results.

[0003] At present, a patent document with application number 201310058645.6 discloses an active balanced three-wire torsion pendulum method rigid body dynamic parameter test bench, which discloses a test bench top plate, three cycloids, a tray, tray reinforcement ribs, a force sensor, a counterweight block and a tray reference mark; the three force sensors are respectively located at the upper ends of the three cycloids and are rigidly fixed on three upper suspension points of the top plate that are evenly distributed in a circle; the tray reference mark is located at the position mark on the upper surface of the tray. The test bench ensures the centering requirements of the three-wire pendulum measurement and the measurement accuracy through the coordination of the counterweight block and the tray reference mark; the moment of inertia of the added counterweight block relative to the torsion pendulum axis can be quickly obtained, and the fixed axis moment of inertia of the measured object can be obtained with only one measurement. However, the counterweight block is only placed on the tray, and the stability is still poor. It is easy to move during the measurement process, thereby introducing measurement errors. Summary of the invention

[0004] The technical solution of the present invention aims at the technical problem that the existing technical solutions are too single, and provides a solution that is significantly different from the existing technologies. It mainly provides a platform for a three-wire pendulum experimental device for measuring the moment of inertia and a method of using the platform, so as to solve the technical problems of complicated operation, poor stability and large measurement errors in the traditional method proposed in the above background technology of maintaining the balance of an object by adding wooden blocks.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: The platform of the three-wire pendulum experimental device for measuring the moment of inertia includes a finely processed disc for placing the object to be measured, a lower bracket fixedly installed at the bottom of the finely processed disc, and an upper bracket located above the finely processed disc, and the lower bracket is hoisted and connected to the upper bracket through a cycloid; the end of the lower bracket is threadedly connected with an adjusting screw.

[0006] Further, the upper bracket includes three short strips, and the lower bracket includes three long strips, and the short strips correspond to and are aligned with the long strips one by one; the ends of the short strips are provided with first connection holes for installing force sensors, and the force sensors have holes for connecting the cycloid; the ends of the long strips are provided with second connection holes for connecting the cycloid; And / or, a length adjusting device is provided on the cycloid.

[0007] Furthermore, the upper bracket includes a first central cylinder and three short strips connected to the outer circumferential surface of the first central cylinder at equal intervals, and the short strips are all located in the radial direction of the first central cylinder, and the head ends of the short strips are connected to the first central cylinder.

[0008] Furthermore, the lower bracket includes a second central cylinder and three long strips connected to the outer circumferential surface of the second central cylinder at equal intervals, and the long strips are all located in the radial direction of the second central cylinder; the length of the long strips is greater than that of the short strips; the head ends of the long strips are connected to the second central cylinder; and the long strips are provided with threaded holes for screwing in adjusting screws.

[0009] Furthermore, the upper bracket, the finishing disc and the lower bracket are coaxially arranged.

[0010] Furthermore, the upper bracket and the lower bracket are made of light metal material; And / or, the upper bracket and the lower bracket are both hollow structures.

[0011] Furthermore, the opening positions of the upper bracket and the lower bracket are both provided with a column structure located in the internal cavity.

[0012] Furthermore, three groups of through holes distributed at equal intervals are provided on the extended circumferential side of the outer edge of the precision-machined disc; And / or, a reference hole is provided at the center of the finishing disc.

[0013] Furthermore, a third connecting hole is formed on the lower bracket, and a fourth connecting hole corresponding to the third connecting hole and allowing a screw to pass through is formed on the finishing disc.

[0014] The present invention also provides a method for using the platform of the three-wire pendulum experimental device for measuring the moment of inertia, comprising the following steps: S1. Adjust the platform of the three-wire pendulum experimental device for measuring the moment of inertia to a balanced state; S2, placing the object to be measured on the finishing disc; S3. Observe the tilt state of the platform and adjust it by screwing in and / or screwing out the adjusting screw (screwing in the adjusting screw on the higher side and / or screwing out the adjusting screw on the lower side) until the platform reaches a balanced state; S4. Start the three-wire pendulum measuring device, record relevant data and calculate the moment of inertia of the object to be measured.

[0015] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention sets a lower bracket at the bottom of the finishing disc, and an adjusting screw is threadedly connected to the lower bracket. When used, the balance can be adjusted for a larger degree of inclination by changing the number, position and other variables of the adjusting screws; and the balance can be adjusted for a slight inclination by adjusting the screw-in depth of the adjusting screw, and a high-precision adjustment operation can be achieved. Compared with the traditional method of adding wooden blocks, this method of adjusting the balance by adjusting screws can be flexibly adjusted according to actual needs, is simple and convenient to operate, and greatly improves the efficiency of platform leveling; at the same time, it can improve the accuracy of balance adjustment; and the threaded connection method makes the adjusting screw highly stable and will not be displaced during the measurement process, thereby avoiding the introduction of measurement errors. Therefore, the present invention can solve the problems of cumbersome operation, poor stability and large measurement errors in the traditional method of maintaining the balance of objects by adding wooden blocks.

[0016] (2) The structure of the present invention is simple, and the material and structural design of the upper bracket, the lower bracket and the disc in the optimization scheme can avoid the accuracy of the three-wire pendulum motion being affected by the excessive inertia of the platform itself, thereby reflecting the optimization consideration of the measurement accuracy in the structural design of the present invention, which helps to improve the accuracy of the moment of inertia measurement.

[0017] (3) The present invention adopts a structure in which the lower bracket is installed at the bottom of the disc, and the end of the lower bracket extends to the outside of the fine-machined disc. When the moment of inertia is slightly increased, the volume of the object that can be measured is increased, especially for slender objects, and the interference that may occur between the slender object and the pendulum rope is reduced. In addition, in the optimization scheme of the present invention, the fine-machined disc and the lower bracket are detachably connected, and the disc is replaceable, and the material can be flexibly adjusted, such as changing from metal to plastic, etc., which facilitates comparative research and calibration of the moment of inertia measurement of objects of different materials.

[0018] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the upper bracket in the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the lower bracket in the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the precision-processed disc in the present invention; Figure 5is a cross-sectional view of the upper bracket in the present invention; Figure 6 is a cross-sectional view of the lower bracket and the finishing disc of the present invention; Figure 7 The moment of inertia data of the upper bracket of the present invention; Figure 8 The moment of inertia data of the precision-machined disc in the present invention; Fig. 9 The moment of inertia data of the lower bracket of the present invention; Fig.10 The rotational inertia data of the whole after the present invention is assembled; Fig.11 is the moment of inertia data of an ordinary disk.

[0020] Figure numerals: 1. upper bracket; 11. first center cylinder; 12. short strip; 13. first connecting hole; 2. lower bracket; 21. second center cylinder; 22. long strip; 23. second connecting hole; 24. third connecting hole; 3. finishing disk; 31. fourth connecting hole; 32. through hole; 33. reference hole; 4. cycloid; 10. threaded hole; 20. column structure. DETAILED DESCRIPTION

[0021] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings, but the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the content disclosed in the present invention more thorough and comprehensive.

[0022] Example 1: Please refer to the attached Figure 1 -Attached Figure 4 , a platform for a three-wire pendulum experimental device for measuring the moment of inertia, comprising: The upper bracket 1 includes a first central cylinder 11 and three short strips 12 connected to the outer circumferential surface of the first central cylinder 11 at equal intervals, and the short strips 12 are all located in the radial direction of the first central cylinder 11; the head end of the short strip 12 is connected to the first central cylinder 11, and the end of the short strip 12 is provided with two first connecting holes 13 for installing a force sensor.

[0023] Lower bracket 2: includes a second central cylinder 21 and three long strips 22 connected to the outer circumference of the second central cylinder 21 at equal intervals, and the long strips 22 are all located in the radial direction of the second central cylinder 21; the length of the long strips 22 is greater than the short strips 12; the head end of the long strips 22 is connected to the second central cylinder 21, and the end of the long strips 22 is provided with two (at least one) threaded holes 10 and a second connection hole 23. After the force sensor is installed on the upper bracket 1, the hole for fixing the cycloid 4 on the force sensor coincides with the second connection hole 23, so as to connect the upper bracket 1 and the lower bracket 2 through the cycloid 4; the threaded hole 10 is used to install the adjustment screw. The upper bracket 1 and the lower bracket 2 are made of light metal material, and have sufficient strength and stability to support the measuring device and the object to be measured.

[0024] Finishing disc 3: installed on the upper end surface of the lower bracket 2, used for placing the object to be measured; the upper bracket 1 is located above the finishing disc 3, and the upper bracket 1, the finishing disc 3 and the lower bracket 2 are coaxially arranged (the center points of the three are located on the same axis), and the end of the lower bracket 2 extends to the outside of the finishing disc 3 to facilitate suspension connection through the cycloid 4; at the same time, when the moment of inertia is increased very little, the volume of the object that can be measured is increased, especially for slender objects, reducing the possible interference between the slender objects and the cycloid 4.

[0025] Cycloid 4: Three high-strength and high-rigidity ropes such as steel wire ropes are used to connect the short strips 12 and the long strips 22 one by one, and the connection points at both ends of the cycloid 4 are fixed and firm to ensure that the cycloid 4 will not loosen or move during the measurement process; the upper bracket 1 is placed on a supporting structure, and the lower bracket 2 and the finishing disc 3 are suspended by three cycloids 4.

[0026] Adjusting screws: There are multiple adjusting screws, which are respectively threadedly connected in the threaded holes 10 of the lower bracket 2. The balance of the platform can be adjusted by adjusting the installation quantity, installation position and screw-in depth of the screws.

[0027] The application process is: 1. Platform assembly 1. First, assemble the upper bracket 1, the finishing disc 3, and the lower bracket 2 according to the design requirements to ensure that all components of the platform are firmly connected.

[0028] 2. Pre-install the adjustment screw in the threaded hole 10 at the end of the lower bracket 2, but do not screw it in too deep to facilitate subsequent adjustment.

[0029] (II) Balance adjustment 1. Before placing the object to be measured, perform a preliminary balance check on the platform. If the platform is found to be tilted, it can be adjusted by screwing in or out the adjustment screw.

[0030] 2. After placing the object to be tested, check the balance of the platform again. According to the actual tilt direction and degree, adjust the adjustment screws at the corresponding positions in a targeted manner.

[0031] (III) Measurement operation 1. After the platform reaches balance, measure the moment of inertia using the conventional three-wire pendulum method.

[0032] 2. During the measurement process, check the balance of the platform regularly. If there is a slight deviation, it can be corrected in time by fine-tuning the adjustment screws.

[0033] When adjusting the balance of the platform as mentioned above, the operator can change the weight distribution at the end of the lower bracket 2 by screwing in or out the adjusting screw in the threaded hole 10 (if one side of the platform is too high, the adjusting screw at the end of the bracket on that side can be screwed in, or the adjusting screw at the end of the bracket on the opposite side can be screwed out until the platform reaches a balanced state). By accurately controlling the screw-in depth of the adjusting screw, the balance of the platform can be fine-tuned, thereby achieving a precise balancing effect.

[0034] Embodiment 2: This embodiment differs from Embodiment 1 in that: Please refer to the attached Figure 5 -Attached Figure 6 The upper bracket 1 and the lower bracket 2 are both made into hollow structures to minimize their own weight and ensure that the measurement results will not be affected by their own weight and strength during the measurement process. The opening positions of the upper bracket 1 and the lower bracket 2 are both provided with a column structure 20 located in the internal cavity to facilitate the continuous setting of various holes.

[0035] Please refer to the attached Figure 4 The outer edge of the finishing disc 3 is provided with three groups of through holes 32 distributed at equal intervals to effectively reduce the influence of its own rotational inertia.

[0036] The rest is the same as the first embodiment.

[0037] When in use, place the object to be measured on the finishing disc 3; by observing the tilting state of the platform, screw in or out the screws in the threaded holes until the platform reaches a balanced state; then start the three-wire pendulum measuring device, record relevant data and calculate the moment of inertia of the object to be measured.

[0038] Embodiment 3: This embodiment differs from Embodiment 2 in that: Please refer to the attached Figure 4 A reference hole 33 is provided at the center of the finishing disk 3 for high-precision spatial positioning of the object to be measured.

[0039] Please refer to the attached Figure 3 -Attached Figure 4The head end and the middle part of the lower bracket 2 are provided with a third connection hole 24, and the finishing disc 3 is provided with a fourth connection hole 31 corresponding to the third connection hole 24. The lower bracket 2 and the finishing disc 3 are connected by screws, so that the finishing disc 3 can be disassembled and replaced, and the material can be flexibly adjusted, such as changing from metal material to plastic material, etc., which is convenient for comparative research and calibration of the moment of inertia measurement of objects of different materials, further enhancing the adjustment range and application prospects of the platform of the present invention. By changing the number, size and distribution density of the through holes 32, the moment of inertia of the finishing disc 3 can be further adjusted to adapt to the moment of inertia measurement with different precision requirements; so that the moment of inertia of the optimized disc with the same diameter is significantly lower than that of the ordinary disc.

[0040] The cycloids 4 are provided with length adjustment devices (not shown in the figure), such as wedge-shaped fasteners, spring-type rope adjusters, manual ratchet devices, etc. The lengths of the three cycloids 4 can be adjusted to meet different measurement requirements and experimental conditions.

[0041] The rest is the same as the second embodiment.

[0042] The moment of inertia data of the upper bracket 1, the finely processed disc 3, the lower bracket 2, the assembly and a common disc in the third embodiment of the present invention are obtained respectively as follows: Figure 7-Figure 11 shown.

[0043] Figure 7 The moment of inertia data reflects the inertial characteristics of the upper bracket 1 under specific structure and material. As a part of the entire measuring platform, the moment of inertia of the upper bracket 1 will affect the motion characteristics of the entire three-wire pendulum system. A reasonable upper bracket design should minimize its own moment of inertia while ensuring sufficient strength to support the measuring device and the object to be measured, so as to reduce interference with the measurement results. Therefore, the materials and structural designs used in the upper bracket 1 of the present invention (such as the possible use of high-strength lightweight materials and hollow structures) help to control its moment of inertia within a reasonable range, and avoid affecting the accuracy of the three-wire pendulum motion due to the excessive inertia of the upper bracket itself, thereby reflecting the optimization of the measurement accuracy in the structural design of the present invention, which helps to improve the accuracy of the moment of inertia measurement.

[0044] Depend on Figure 8 From the data, it can be seen that the mass of the finished disc 3 in Example 3 is 32.224 kg and the volume is 11969676.109 cubic millimeters. These data reflect the physical scale of the disc and are relevant to the calculation of the moment of inertia. Under the same shape and material distribution, a smaller mass or volume helps to reduce the moment of inertia.

[0045] In the third embodiment, the principal axis directions of the inertia of the finishing disc 3 are Ix = (0.000, 0.000, 1.000), Iy = (1.000, 0.000, 0.000), and Iz = (0.000, 1.000, 0.000), and the principal moments of inertia are Px = 1958179.420, Py = 1958179.420, and Pz = 3914983.963 (unit: kg * square millimeter). This shows that the rotational inertia of the disc in the z-axis direction is relatively large, which is related to factors such as the geometric shape, mass distribution, and circular hole distribution of the disc. The through holes evenly distributed around the disc can change the mass distribution, thereby affecting the moment of inertia. In the present invention, by optimizing the circular hole design, the inertial characteristics of the disc in different directions can be adjusted to a certain extent, so that it is more in line with the measurement requirements and the measurement accuracy is improved.

[0046] In the third embodiment, in the barycentric coordinate system, Lxx = 1958179.420, Lyy = 3914983.963, Lzz = 1958179.420 (unit: kg*mm2), and other components are 0. This further illustrates the symmetry of the distribution of the mass of the disk relative to the coordinate axis, and reflects the effectiveness of the present invention in regulating the moment of inertia by optimizing the design of the disk (such as the distribution of circular holes), so that the inertial characteristics of the disk are more conducive to the accurate measurement of the moment of inertia.

[0047] Therefore, compared with the traditional disc, the precision-machined disc of the present invention has effectively reduced its own moment of inertia through the optimization design such as the distribution of through holes on the outer edge, and can be flexibly adjusted according to the measurement requirements. This makes the disc itself have less influence on the measurement results of the moment of inertia during the measurement process, and improves the measurement accuracy. At the same time, the detachable and replaceable design of the disc facilitates the comparative study and calibration of the moment of inertia measurement of objects of different materials, further enhancing the functionality and applicability of the platform, and reflecting the flexibility and accuracy advantages of the present invention in the measurement of moment of inertia.

[0048] Depend on Fig. 9 It can be seen from the data that the mass of the lower bracket 2 in Example 3 is 7.600 kg, the volume is 1455957.476 cubic millimeters, and the surface area is 972837.212 square millimeters. The mass and volume data of the lower bracket 2 affect its moment of inertia. Smaller mass and reasonable volume help reduce its inertial influence on the overall measurement system. Especially in the process of adjusting the balance, the lighter lower bracket 2 is easier to operate and accurately control.

[0049] In Example 3, the principal axis directions of the inertia of the lower bracket 2 are Ix = (0.000, 0.000, 1.000), Iy = (1.000, 0.000, 0.000), and Iz = (0.000, 1.000, 0.000), and the principal moments of inertia are Px = 446224.219, Py = 446224.219, and Pz = 888137.234 (unit: kilograms * square millimeters). The rotational inertia of the lower bracket 2 in the z-axis direction is relatively large, which is related to the structural shape and mass distribution of the lower bracket 2. In the present invention, the materials and structures used in the lower bracket 2 (such as a hollow structure made of high-strength lightweight materials) help to optimize its inertial characteristics while ensuring the supporting function, thereby minimizing its influence on the measurement accuracy in the three-wire pendulum system.

[0050] Therefore, the design of the lower bracket 2 of the present invention effectively controls its own moment of inertia by selecting appropriate materials and structural forms while ensuring sufficient strength and stability, thereby reducing the adverse effects on the balance adjustment of the measuring platform and the measurement of the moment of inertia. At the same time, the threaded hole at the end of the lower bracket 2 is designed to install an adjustment screw, which facilitates the precise adjustment of the platform balance, improves the operational convenience and measurement accuracy of the entire measuring system, and reflects the comprehensive optimization of the present invention in terms of structural design for measurement accuracy and operational convenience.

[0051] Depend on Fig.10 From the data, it can be seen that the total mass of the assembly of the present invention is 44178.43 grams (i.e. 44.17843 kilograms), and the center of mass coordinates are X = -95.79 mm, Y = 156.72 mm, and Z = 944.72 mm. The overall mass and the center of mass position are the key parameters of the entire measuring platform in the three-wire pendulum system. The precise determination of the center of mass position is crucial to ensure the stability of the three-wire pendulum motion and the measurement accuracy. The present invention ensures that the center of mass can be as close to the ideal position as possible under different measurement conditions through reasonable structural design and adjustment mechanism (such as adjusting the balance of the threaded holes of the upper and lower brackets), thereby reducing the measurement error caused by the center of mass offset.

[0052] The directions of the principal axes of inertia of the assembly of the present invention are Ix = (0, 0, 1), Iy = (1, 0, 0), and Iz = (0,1, 0), and the principal moments of inertia are Px = 2623236800.63, Py = 2623236800.63, and Pz = 5221344706.76 (unit: gram square millimeter, converted to 2623.23680063, 2623.23680063, and 5221.34470676 kilogram square millimeter). The overall principal axis of inertia and the principal moment of inertia reflect the rotational inertia of the platform in different directions after the assembly is completed. The innovative design of the present invention (such as the structural optimization of the upper and lower brackets, the optimized design of the disc, etc.) makes the overall inertial characteristics of the platform more stable and predictable, which helps to accurately measure the moment of inertia in the three-wire pendulum motion and improve the reliability of the measurement results.

[0053] In the center of gravity coordinate system and the output coordinate system, the components of the inertia tensor of the assembly of the present invention describe in detail the inertia relationship of the whole in the direction of each coordinate axis. These data show that the present invention makes the overall mass distribution of the platform have reasonable characteristics relative to the coordinate axis through precise structural design and component optimization, thereby ensuring that the inertia characteristics of the object to be measured can be accurately reflected during the moment of inertia measurement process, reducing system errors, and reflecting the advantages of the present invention in improving measurement accuracy.

[0054] Therefore, it can be seen from the overall moment of inertia data after assembly that the innovative platform for measuring moment of inertia based on the three-wire pendulum method of the present invention has achieved reasonable control of the overall mass distribution and precise adjustment of the center of mass position under the comprehensive effects of structural design, component optimization and adjustment mechanism. This enables the platform to operate stably during the three-wire pendulum measurement process and accurately measure the moment of inertia, effectively reducing the interference of various factors on the measurement results, reflecting the significant advantages of the present invention in terms of accuracy, stability and reliability of moment of inertia measurement, and providing a more accurate and efficient moment of inertia measurement solution for scientific experiments and technical research.

[0055] The moment of inertia data of ordinary disk (attached Fig.11 ) and the moment of inertia data of the finishing disc 3 of the present invention (see Appendix Figure 8 ) by comparison, it can be clearly seen that the disk of the present invention has an optimized effect in terms of rotational inertia. Since ordinary disks do not adopt measures such as the circular hole optimization design in the present invention, their rotational inertia may be large and difficult to adjust. However, the disk of the present invention has effectively reduced its own rotational inertia through innovative points such as the through holes distributed on the outer edge and the detachable and replaceable design, and has the ability to be flexibly adjusted.

[0056] Therefore, this comparison highlights the advancedness of the present invention in the disc design, which can more accurately control the disc's moment of inertia by changing the disc's through-hole parameters or materials according to different measurement needs and accuracy requirements, thereby improving the accuracy of the entire measurement platform in measuring the moment of inertia of different objects. At the same time, the adjustability of the disc enhances the adaptability of the platform, and can be widely used in the measurement of the moment of inertia of objects of various materials and types, further reflecting the innovative value and practical advantages of the present invention in the field of moment of inertia measurement technology.

[0057] Through the attachment Figure 7-11 The detailed analysis of the moment of inertia data of each component can fully understand the characteristics and advantages of the present invention in terms of structural design, component optimization and function realization. These advantages work together to make the innovative platform for measuring moment of inertia based on the three-wire pendulum method of the present invention perform well in terms of improving measurement accuracy, stability, ease of operation and wide application, providing strong support for the development of moment of inertia measurement technology.

[0058] In summary, the present invention can effectively adjust the balance of the chassis, significantly reduce the errors caused by traditional adjustment methods, and improve the accuracy of moment of inertia measurement. During the measurement process, the platform can stably maintain the working state of the three-wire pendulum. Its sturdy structural design and precise adjustment mechanism cooperate with each other, effectively reducing the impact of external interference on the measurement results. Whether in the fields of physical experiment teaching or scientific research, the present invention provides a more accurate and efficient solution for the measurement of moment of inertia.

[0059] The above is an exemplary description of the present invention in combination with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as such non-substantial improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A platform for a three-wire pendulum experimental device for measuring moment of inertia, characterized in that: The invention comprises a finishing disc (3) for placing a measured object, a lower bracket (2) fixedly mounted on the bottom of the finishing disc (3), and an upper bracket (1) located above the finishing disc (3), wherein the lower bracket (2) is hoistedly connected to the upper bracket (1) via a cycloid (4); and an adjusting screw is threadedly connected to the end of the lower bracket (2).

2. The platform of the three-wire pendulum experimental device for measuring the moment of inertia according to claim 1, characterized in that: The upper bracket (1) comprises three short strips (12), and the lower bracket (2) comprises three long strips (22), wherein the short strips (12) correspond to and are aligned with the long strips (22) one by one; a first connection hole (13) for mounting a force sensor is provided at the end of the short strip (12), and the force sensor has a hole for connecting a cycloid (4); a second connection hole (23) for connecting a cycloid (4) is provided at the end of the long strip (22); And / or, the cycloid (4) is provided with a length adjustment device.

3. The platform of the three-wire pendulum experimental device for measuring the moment of inertia according to claim 2, characterized in that: The upper bracket (1) comprises a first central cylinder (11) and three short strips (12) connected to the outer circumferential surface of the first central cylinder (11) at equal intervals, and the short strips (12) are all located in the radial direction of the first central cylinder (11), and the head ends of the short strips (12) are connected to the first central cylinder (11).

4. The platform of the three-wire pendulum experimental device for measuring the moment of inertia according to claim 2, characterized in that: The lower bracket (2) comprises a second central cylinder (21) and three long strips (22) connected to the outer circumferential surface of the second central cylinder (21) at equal intervals, and the long strips (22) are all located in the radial direction of the second central cylinder (21); the length of the long strips (22) is greater than that of the short strips (12); the head end of the long strips (22) is connected to the second central cylinder (21); and the long strips (22) are provided with threaded holes (10) for screwing in adjustment screws.

5. The platform of the three-wire pendulum experimental device for measuring the moment of inertia according to claim 1, characterized in that: The upper bracket (1), the finishing disc (3) and the lower bracket (2) are coaxially arranged.

6. The platform of the three-wire pendulum experimental device for measuring the moment of inertia according to claim 1, characterized in that: The upper bracket (1) and the lower bracket (2) are made of lightweight metal material; And / or, the upper bracket (1) and the lower bracket (2) are both hollow structures.

7. The platform of the three-wire pendulum experimental device for measuring the moment of inertia according to claim 6, characterized in that: The opening positions of the upper bracket (1) and the lower bracket (2) are both provided with a column structure (20) located in the internal cavity.

8. The platform of the three-wire pendulum experimental device for measuring the moment of inertia according to claim 1, characterized in that: The outer edge of the finishing disc (3) is provided with three groups of through holes (32) distributed at equal intervals on the extended circumference side; And / or, a reference hole (33) is provided at the center of the finishing disc (3).

9. The platform of the three-wire pendulum experimental device for measuring the moment of inertia according to claim 1, characterized in that: The lower bracket (2) is provided with a third connection hole (24), and the finishing disc (3) is provided with a fourth connection hole (31) which corresponds one-to-one with the third connection hole (24) and is used for screws to pass through.

10. A method for using a platform of a three-wire pendulum experimental device for measuring moment of inertia, characterized in that: The steps include: S1. Adjust the platform of the three-wire pendulum experimental device for measuring the moment of inertia according to any one of claims 1 to 9 to a balanced state; S2, placing the object to be tested on the finishing disc (3); S3. Observe the tilt state of the platform and adjust it by screwing in and / or out the adjusting screw until the platform reaches a balanced state; S4. Start the three-wire pendulum measuring device, record relevant data and calculate the moment of inertia of the object to be measured.

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