Assembly type magic cube structure gravity center measuring device for theoretical mechanics teaching

Abstract

The utility model relates to the technical field of theoretical mechanics experiment teaching equipment, in particular to an assembly type magic cube structure gravity center measuring device and method for theoretical mechanics teaching. Comprising a testing mechanism and a plurality of supporting bases, and the supporting bases are located at the bottom end of the testing mechanism and used for supporting the testing mechanism; the testing mechanism comprises a separation frame and cover plates, and six surfaces of the separation frame are slidably connected with the cover plates. According to the assembled magic cube structure gravity center measuring device and method for theoretical mechanics teaching, through the concept of the structure, a two-dimensional plane device used in existing theoretical mechanics experiment teaching is transformed into a three-dimensional device, and meanwhile, a fixed structure of an original experiment device is transformed into a detachable assembled structure; the problems that in existing theoretical mechanics experiment teaching, experimental instruments are disjointed from actual engineering problems, and students are lack of interest are solved, the learning interest of the students is stimulated, and the operational ability and innovation ability of the students are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to theoretical mechanics experimental teaching equipment technical field especially relates to the assembly type magic cube structure gravity measurement device and method for theoretical mechanics teaching. BACKGROUND

[0002] Gravity measurement has a crucial position in the field of aerospace. Precise gravity points help to ensure flight orbit accuracy, improve spacecraft performance, and ensure flight safety. Gravity measurement technology is based on the principle of torque balance, and the related knowledge points are more theoretical in theoretical mechanics teaching, and the knowledge points are more abstract, and students feel more boring when learning. At present, the theoretical mechanics courses offered by many majors in higher engineering colleges have gradually increased the experimental class hours.

[0003] The model used in the current theoretical mechanics experimental teaching is a two-dimensional model, which can only test the coordinates of the gravity center in the x and y directions, and the test content is simple and has limitations, and is disconnected with actual engineering. Because the gravity measurement technology in actual engineering application is not limited to two-dimensional measurement, but three-dimensional or even multi-dimensional measurement. For example, in addition to measuring the gravity center position of an object, the change trend and dynamic response of the gravity center can also be measured. Multi-dimensional measurement can provide more comprehensive information for the design and optimization of aerospace vehicles, improving the performance and safety of the vehicles. The test model currently used is simple in structure, and the gravity center design scheme is less, so students can easily test the results, and the challenge is not enough, and it is easy to feel boring.

[0004] Therefore, the assembly type magic cube structure gravity measurement device and method for theoretical mechanics teaching are designed to provide another technical solution to the above technical problems. INVENTION CONTENTS

[0005] Therefore, it is necessary to provide an assembly type magic cube structure gravity measurement device and method for theoretical mechanics teaching to solve the technical problems raised in the above background art.

[0006] In order to solve the above technical problems, the utility model adopts the following technical scheme:

[0007] The assembly type magic cube structure gravity measurement device for theoretical mechanics teaching comprises a test mechanism and a plurality of support bases, and the plurality of support bases are located at the bottom end of the test mechanism and used to support the test mechanism.

[0008] The test mechanism comprises a partition frame and a cover plate, and the six surfaces of the partition frame are slidably connected with the cover plates.

[0009] The separation frame is composed of a first component, a second component, a third component and a fourth component, the first component is located on top of the second component, the second component is located on top of the third component, and the third component is located on top of the fourth component.

[0010] As a preferred embodiment of the assembled Rubik's Cube structure gravity measuring device for theoretical mechanics teaching provided by the utility model, a plurality of electronic scales are further included, the top of the electronic scale is in contact with the bottom of the supporting base, and the electronic scale is used for gravity detection of the testing mechanism.

[0011] As a preferred embodiment of the assembled Rubik's Cube structure gravity measuring device for theoretical mechanics teaching provided by the utility model, positioning grooves are uniformly arranged in the interior of the cover plate, assembly screw holes are uniformly arranged in the interior of the cover plate and at positions staggered with the positioning grooves, and the cover plate is connected with the separation frame through cooperation of the assembly screw holes and the screws.

[0012] As a preferred embodiment of the assembled Rubik's Cube structure gravity measuring device for theoretical mechanics teaching provided by the utility model, the top of the supporting base is in sliding connection with the positioning groove, and the top of the supporting base and the positioning groove are conical or cylindrical.

[0013] As a preferred embodiment of the assembled Rubik's Cube structure gravity measuring device for theoretical mechanics teaching provided by the utility model, a first horizontal frame is fixed to the outer side of the first component, a second horizontal frame is fixed to the outer side of the fourth component, vertical columns are fixed to the outer sides of four end corners of the second component and the third component, a latch is fixed to the top of the second horizontal frame and the vertical column, the top latch of the vertical column is in interference fit with the bottom of the first horizontal frame, the top latch of the second horizontal frame is in interference fit with the bottom of the vertical column, and the top latch of the bottom vertical column is in interference fit with the bottom of the top vertical column.

[0014] As a preferred embodiment of the assembled Rubik's Cube structure gravity measuring device for theoretical mechanics teaching provided by the utility model, the first component, the second component, the third component and the fourth component are composed of a plurality of first separation plates, a horizontal bottom plate and a plurality of second separation plates, the first separation plates are fixed to the top of the second component in a uniform manner, the second separation plates are fixed to the top of the second component in a uniform manner, and the first separation plates and the second separation plates are fixed in a cross staggered manner, so as to form a plurality of placing cavities on the top of the horizontal bottom plate.

[0015] As a preferred embodiment of the utility model provides the assembly type magic cube structure gravity measurement device for theoretical mechanics teaching, the first assembly's four around and located first partition board and second partition board and horizontal bottom plate connection position evenly open first threaded hole, the first assembly's top and fourth assembly's bottom and located first partition board and second partition board staggered position evenly open second threaded hole, the third assembly's four around and located first partition board and second partition board and horizontal bottom plate connection position evenly open third threaded hole, and the first threaded hole, second threaded hole, third threaded hole respectively with the threaded hole position in the corresponding cover board assembly corresponds.

[0016] As a preferred embodiment of the utility model provides the assembly type magic cube structure gravity measurement device for theoretical mechanics teaching, still includes a steel ball, for putting into the inside of the cavity, provides different counterweight mode.

[0017] It can be seen without doubt that the above technical scheme of the application can certainly solve the technical problems to be solved by the application.

[0018] Meanwhile, through the above technical scheme, the utility model at least has the following beneficial effects:

[0019] 1, the utility model provides a kind of assembly type magic cube structure gravity measurement device and method for theoretical mechanics teaching provided by the utility model, by the concept of structure, the two-dimensional plane device used in existing theoretical mechanics experimental teaching is reformed into three-dimensional device, and the original experimental device fixed structure is reformed into detachable assembly structure;Solve the existing theoretical mechanics experimental teaching existing experimental apparatus and actual engineering problem disjunction, student lacks interest problem, and then stimulate student interest in learning, improve its ability and innovation ability.

[0020] 2, the utility model assembly type magic cube structure gravity measurement device structure is simple and low in cost;The structure of assembly makes it easy to form in 3D printing process, can be assembled after layer-by-layer printing, avoids complex process such as supporting when whole forming;And material uses ordinary plastic, plus ordinary household electronic scale and steel ball can constitute complete set of device, cost is extremely low, can be used in theoretical mechanics experimental teaching in large quantities.

[0021] 3、The counterweight mode of the assembled Rubik's cube structure gravity measuring device can accurately give the gravity center position; the general gravity center measuring device adjusts the gravity center position by a push rod or a screw to change the test condition; although this method has high adjustment accuracy, it has a complex structure, high manufacturing and maintenance cost, and the adjusted gravity center position is not easy to accurately give; the assembled Rubik's cube structure gravity measuring device adopts the structure of the Rubik's cube, and the counterweight steel balls are dispersedly distributed in the fixed compartment, and the gravity center can be given only by knowing the counterweight position; although the counterweight mode of the Rubik's cube structure cannot continuously adjust the gravity center position, the measurement accuracy is greatly improved.

[0022] 4、The cover plate is designed for the blind measurement of the gravity center of the assembled Rubik's cube structure gravity measuring device; the current aircraft gravity center test algorithm can be optimized for a certain type of gravity center distribution, which leads to poor generality of the test; the Rubik's cube structure can be used to conveniently design the cover plate of the device to realize blind measurement and truly test the accuracy and ability of the test algorithm; the blind measurement is that when the number and distribution of the counterweight steel balls in the Rubik's cube structure gravity measuring device are unknown, the number and distribution are calculated through the test.

[0023] 5、The assembled Rubik's cube structure gravity measuring device can carry out interactive game experiments; in addition to being randomly placed by the teacher and tested by the students, the device can also divide the students into two groups to compete, one group places the steel balls, the other group tests, then exchanges, and finally the fastest result is the winner; students can gradually increase the difficulty in multiple rounds of competition until the opponent cannot solve the result, and then all students and teachers discuss the solution together; the interactive teaching method can greatly improve the students' interest in learning and participation.

[0024] 6、There are few ready-made experimental instruments for theoretical mechanics experiments, and innovative experiments are currently in the initial stage, and the experimental device can provide certain equipment support for theoretical mechanics innovative experimental teaching. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical scheme of the utility model embodiment, the following will be briefly introduced the drawings needed to be used in the embodiment description, obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creating creative labor.

[0026] Figure 1 It is the overall application structure schematic diagram of the utility model;

[0027] Figure 2 It is the explosion drawing of the utility model;

[0028] Figure 3 It is the explosion drawing of the test mechanism of the utility model;

[0029] Figure 4 is a bottom view of the utility model Figure 3 ;

[0030] Figure 5 is a structural schematic view of the utility model cover plate

[0031] Figure 6 is a bottom view of the utility model Figure 5 ;

[0032] Figure 7 is a coordinate schematic view of the utility model partition frame.

[0033] In the figure: 1, test mechanism; 2, support base; 3, electronic scale; 4, partition frame; 5, cover plate; 6, first assembly; 7, second assembly; 8, third assembly; 9, fourth assembly; 10, first horizontal frame; 11, second horizontal frame; 12, stand; 13, bolt; 14, positioning groove; 15, assembly threaded hole; 16, first partition plate; 17, horizontal bottom plate; 18, second partition plate. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the utility model more clear and obvious, the following will be combined with the drawings and examples, and the utility model will be further described in detail.It should be understood that the specific examples described herein are only used to explain the utility model, and are not used to limit the utility model.

[0035] In order to make the person in the technical field better understand the utility model scheme, the following will be combined with the drawings, and the technical scheme in the utility model example will be clearly and completely described.

[0036] It should be noted that in the case of no conflict, the examples and the features and technical solutions in the examples in the utility model can be combined with each other.

[0037] It should be noted that: similar signs and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0038] Example one

[0039] Referring to Figures 1-7 , the assembled magic cube structure center of gravity measuring device for theoretical mechanics teaching, including test mechanism 1 and a plurality of support bases 2, a plurality of support bases 2 are located at the bottom end of test mechanism 1, for supporting test mechanism 1;

[0040] It also includes a plurality of electronic scales 3, and the top of the electronic scale 3 is in contact with the bottom of the support base 2, and the center of gravity of the test mechanism 1 is detected through the contact of the plurality of electronic scales 3 and the support base 2;

[0041] In this embodiment, the electronic scale 3 is a common household small electronic scale, the range is 2 kg, and the accuracy is 0.1 g.

[0042] The test mechanism 1 comprises a partition frame 4 and a cover plate 5. The partition frame 4 is rectangular in shape and has six sides. The cover plate 5 is slidably connected to the six sides of the partition frame 4, so that the cover plate 5 can be assembled on the six sides of the partition frame 4 to close the six sides of the partition frame 4. Positioning grooves 14 are evenly arranged in the interior of the cover plate 5. The positioning grooves 14 are arranged in four rows, with four in each row, so that the positioning grooves 14 correspond to the positions of the placement cavities on the partition frame 4. Assembly threaded holes 15 are evenly arranged in the interior of the cover plate 5 at positions staggered with the positioning grooves 14. The cover plate 5 is connected to the partition frame 4 through the assembly of the assembly threaded holes 15 and screws, so that the cover plate 5 can be connected to the partition frame 4 by means of the screws entering the interior of the assembly threaded holes 15, and a magic cube structure is formed. The screws in the assembly threaded holes 15 can be removed as needed to separate the cover plate 5 from the partition frame 4.

[0043] In this embodiment, the top of the support base 2 and the positioning groove 14 are both conical in shape. The top of the support base 2 is slidably connected to the positioning groove 14, so that the top of the support base 2 can directly enter the interior of the positioning groove 14 to support the test mechanism 1, thereby forming a stable connection structure through the three support bases 2.

[0044] In other embodiments, the top of the support base 2 and the positioning groove 14 are both cylindrical in shape. The top of the support base 2 is slidably connected to the positioning groove 14, so that the top of the support base 2 can enter the interior of the positioning groove 14 to support the test mechanism 1. The top of the support base 2 and the positioning groove 14 can also be trapezoidal, irregular, etc.

[0045] The partition frame 4 is composed of a first component 6, a second component 7, a third component 8, and a fourth component 9. The first component 6 is located on the top of the second component 7, the second component 7 is located on the top of the third component 8, and the third component 8 is located on the top of the fourth component 9, so that the first component 6, the second component 7, the third component 8, and the fourth component 9 can be sequentially assembled to form the partition frame 4 according to height.

[0046] In this embodiment, the bottom of the first component 6, the second component 7, and the third component 8 is planar.

[0047] The outer side of the first assembly 6 is fixed with a first horizontal frame 10, and the outer side of the fourth assembly 9 is fixed with a second horizontal frame 11. When the first assembly 6 is located at the top of the partition frame 4, and the fourth assembly 9 is located at the bottom of the partition frame 4, the first horizontal frame 10 and the second horizontal frame 11 are symmetrically arranged. The outer side of the four corners of the second assembly 7 and the third assembly 8 is fixed with a stand 12. Thus, when the first assembly 6, the second assembly 7, the third assembly 8 and the fourth assembly 9 form the partition frame 4, the cover plate 5 can be assembled by the frame formed by the first horizontal frame 10, the stand 12 and the second horizontal frame 11. The top of the second horizontal frame 11 and the stand 12 is fixed with a latch 13. The top latch 13 of the stand 12 is in interference fit with the bottom of the first horizontal frame 10. The top latch 13 of the second horizontal frame 11 is in interference fit with the bottom of the stand 12. The top latch 13 of the bottom stand 12 is in interference fit with the bottom of the top stand 12. Thus, the first horizontal frame 10 and the top stand 12, the top stand 12 and the bottom stand 12, and the bottom stand 12 and the second horizontal frame 11 can be assembled by the sliding and interference fit of the latches 13. Thus, the partition frame 4 is formed.

[0048] The first assembly 6, the second assembly 7, the third assembly 8 and the fourth assembly 9 are each composed of a plurality of first partition plates 16, a horizontal bottom plate 17 and a plurality of second partition plates 18. The top of the second assembly 7 is uniformly fixed with the first partition plates 16. The top of the second assembly 7 is uniformly fixed with the second partition plates 18. Thus, the first partition plates 16, the horizontal bottom plate 17 and the second partition plates 18 are integrated. The first partition plates 16 and the second partition plates 18 are crosswise staggered and fixed. The first partition plates 16 and the second partition plates 18 form a plurality of placing cavities on the top of the horizontal bottom plate 17. Thus, the placing cavities can be supported by the horizontal bottom plate 17, and the counterweight objects can be placed in the placing cavities.

[0049] In this embodiment, the number of the first partition plates 16 and the second partition plates 18 is three. Thus, the crosswise staggering of the first partition plates 16 and the second partition plates 18 forms sixteen placing cavities on the top of the horizontal bottom plate 17. The positions of the positioning grooves 14 correspond to the positions of the placing cavities.

[0050] In the embodiment, the first connecting threaded holes, the second threaded holes and the third threaded holes are respectively arranged at positions corresponding to the assembly threaded holes 15 in the cover plate 5, so that when the cover plate 5 is installed on the inner side of the six surfaces of the partition frame 4, the screws are inserted into the assembly threaded holes 15 and connected with the corresponding first connecting threaded holes or second threaded holes or third threaded holes, the assembly of the cover plate 5 and the partition frame 4 is realized, and the cover plate 5 can be separated from the partition frame 4 by removing the screws.

[0051] In other embodiments, the threaded holes corresponding to the cover plate 5 can also be arranged at other positions of the first assembly 6, the second assembly 7, the third assembly 8 or the fourth assembly 9.

[0052] The steel ball is also included and is arranged in the inside of the placement cavity, and different counterweight modes are provided according to the placement in different placement cavities.

[0053] In the embodiment, the support base 2, the partition frame 4 and the cover plate 5 are all formed by plastic 3D printing.

[0054] The use process of the assembled magic cube structure gravity center measuring device for theoretical mechanics teaching is as follows: in use, the first assembly 6, the second assembly 7, the third assembly 8 and the fourth assembly 9 formed by plastic 3D printing are sequentially stacked, the first assembly 6, the second assembly 7, the third assembly 8 and the fourth assembly 9 are connected into one by the insertion of the pins 13 and the interference fit connection between the first assembly 6 and the second assembly 7, between the second assembly 7 and the third assembly 8, and between the third assembly 8 and the fourth assembly 9, to form the partition frame 4, the steel ball providing counterweight is arranged in the inside of the corresponding placement cavity, the cover plate 5 is assembled in the six surfaces of the partition frame 4 by sliding and is connected with the corresponding first connecting threaded holes or second threaded holes or third threaded holes in the assembly threaded holes 15 by the screws, to realize the assembly of the cover plate 5 and the partition frame 4, the support base 2 is arranged at the bottom of the bottom cover plate 5, the top of the support base 2 is arranged in the inside of the corresponding positioning groove 14, three support bases 2 support the test mechanism 1, and the support base 2 is arranged on the top of the electronic scale 3 to measure the gravity center.

[0055] Embodiment two

[0056] On the basis of the above-mentioned embodiment one, the use method is disclosed, and the steps are as follows:

[0057] First step: set the mass of the steel balls and other parts of the device;

[0058] There are n steel balls, made of stainless steel, each with a mass of m1 grams, and the size matches the size of the placement cavities in the partition frame 4. Each placement cavity can hold one steel ball and is tightly fixed.

[0059] The total mass of the partition frame 4, the cover plate 5, and the screws that fix them is known as m2 grams.

[0060] The total mass of the n steel balls nm1 should be greater than the total mass of the other parts of the device m2 to ensure the sensitivity of the device to the position adjustment of the counterweight.

[0061] Second step: randomly select n steel balls and place them in any layer of the partition frame 4, assemble the first component 6, the second component 7, the third component 8, and the fourth component 9 into one by the bolt 13 to form the partition frame 4, and fix the cover plate 5 on the six sides of the partition frame 4 by the screws and the threaded holes 15 to form the test mechanism 1.

[0062] Third step: Place three electronic scales 3 on the same horizontal plane and place three support bases 2 at the center of the three electronic scales 3, then turn on the electronic scales 3 and reset them to zero.

[0063] Fourth step: Place the assembled test mechanism 1 with any side facing down on the top of the three support bases 2, and adjust the position of the electronic scales 3 and the support bases 2 so that the top of the three support bases 2 is inserted into the inside of the positioning groove 14 of the cover plate 5, and the test mechanism 1 can remain stable.

[0064] Fifth step: Choose the lower left corner of the test mechanism 1 as the origin of the coordinate system to establish a spatial rectangular coordinate system, and set up x-axis, y-axis, and z-axis respectively. Assuming that the length of each placement cavity is 2, the distance between the positioning groove 14 on each cover plate 5 and the coordinate axis is an odd multiple of 1.

[0065] Sixth step: For the x-y coordinate system, read the readings of the three electronic scales 3 as M1, M2, and M3, and the coordinates of the three positioning grooves 14 as (x1, y1), (x2, y2), and (x3, y3) respectively.

[0066] Seventh step: Rotate the test mechanism 1 by 90° around the x-axis, place it on the top of the three support bases 2 with the x-z coordinate system as the bottom surface, and adjust the position of the electronic scales 3 and the support bases 2 so that the top of the three support bases 2 is inserted into the positioning groove 14 of the cover plate 5, and the test mechanism 1 can remain stable.

[0067] Step 8: Read the readings of the three electronic scales 3 as M4, M5, M6, and the coordinates of the three positioning grooves 14 as (x4, z1), (x5, z2), (x6, z3) respectively in the x-z coordinate system.

[0068] Step 9: According to the moment of force theorem, the two-dimensional center of gravity coordinates (x c1 , y c ) of the test mechanism 1 in the x-y coordinate system can be obtained, and the calculation formula is:

[0069]

[0070] The two-dimensional center of gravity coordinates (x c2 , z c ) of the test mechanism 1 in the x-z coordinate system can be obtained, and the calculation formula is:

[0071]

[0072] In theory, x c1 and x c2 calculated by the above two coordinate systems should be the same, but due to measurement and calculation errors, there will be a small difference, so take the average of the two as the final x c .

[0073] Then the three-dimensional center of gravity coordinates of the test mechanism 1 are (x c , y c , z c ).

[0074] Step 10: Determine the number of steel balls. Place the assembled test mechanism 1 on an electronic scale 3 and weigh the total mass m3 grams ， Calculate the number of steel balls n by the formula:

[0075]

[0076] Where n is the largest integer not greater than its value.

[0077] Step 11: Determine the specific position coordinates of the steel balls. The mass of each part of the test mechanism 1 is uniform, and the center of gravity coordinates are at the center, so the center of gravity coordinates of the empty test mechanism 1 are (4, 4, 4), and the equivalent center of gravity coordinates of the n steel balls are (x 球 , y 球 , z 球 ). Treat the empty test mechanism 1 and the n steel balls as two whole bodies respectively, and calculate the moment of force on the x, y, and z axes respectively. The algebraic sum of the moments of force of the two parts on one axis is equal to the moment of force of the test mechanism 1 after the steel balls are placed, that is, the moment of force theorem:

[0078] x 球 ·nm1+4·m2=xc • m3

[0079] y 球 • nm1+4·m2=y c • m3

[0080] z 球 • nm1+4·m2=z c • m3

[0081] The equivalent center of gravity coordinates of the n steel balls can be obtained as (x 球 , y 球 , z 球 ). If n=1, (x 球 , y 球 , z 球 ) is the coordinate of the center of gravity of the steel ball. If n>1, since different distribution modes of the multiple steel balls can produce the same equivalent center of gravity coordinates, the mass distribution of the test mechanism 1 at different positions needs to be measured multiple times. Since the separating frame 4 and the cover plate 5 are made of plastic and their mass is much smaller than that of the steel balls, when the supporting base 2 is moved to measure the mass at different positions, the reading of the electronic scale 3 will change more sensitively when the position with or without the steel ball is compared, so the distribution range of the steel balls can be gradually narrowed, the wrong distribution mode can be excluded, and finally the position coordinates of the multiple steel balls can be determined.

[0082] The preferred embodiments disclosed above are only used to help describe the utility model. The preferred embodiments do not describe all the details and do not limit the utility model to the specific embodiments described. Obviously, according to the content of the specification, many modifications and changes can be made. The specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that the technicians in the technical field can well understand and utilize the utility model. The utility model is limited by the claims and the entire scope and equivalents thereof.

Claims

1. A center of gravity measuring device for assembled magic cube structure for teaching theoretical mechanics, characterized in that, Including test mechanism (1) and a plurality of support base (2), a plurality of support base (2) are located at the bottom end of test mechanism (1), for supporting test mechanism (1); The test mechanism (1) comprises a partition frame (4) and a cover plate (5), and the six surfaces of the partition frame (4) are slidably connected with the cover plate (5); The partition frame (4) is composed of a first component (6), a second component (7), a third component (8) and a fourth component (9), the first component (6) is located on the top of the second component (7), the second component (7) is located on the top of the third component (8), and the third component (8) is located on the top of the fourth component (9).

2. The assembled cube structure barycenter measuring device for theoretical mechanics teaching according to claim 1, characterized in that, It also includes a plurality of electronic scales (3), the top of the electronic scale (3) is in contact with the bottom of the support base (2), which is used for detecting the center of gravity of the test mechanism (1).

3. The assembled cube structure barycenter measuring device for theoretical mechanics teaching according to claim 1, characterized in that, The inside of the cover plate (5) is evenly provided with a positioning groove (14), and the inside of the cover plate (5) is evenly provided with an assembly screw hole (15) at a position staggered with the positioning groove (14), and the cover plate (5) is connected with the partition frame (4) through the assembly screw hole (15) and the screw.

4. The assembled magic cube structure barycenter measuring device for theoretical mechanics teaching according to claim 3, characterized in that, The top of the support base (2) is slidably connected with the positioning groove (14), and the top of the support base (2) and the positioning groove (14) are conical or cylindrical.

5. The assembled magic cube structure barycenter measuring device for theoretical mechanics teaching according to claim 1, characterized in that, The outside of the first component (6) is fixed with a first horizontal frame (10), the outside of the fourth component (9) is fixed with a second horizontal frame (11), the outside of the second component (7) and the third component (8) is fixed with a stand (12), the top of the second horizontal frame (11) and the stand (12) is fixed with a latch (13), the top latch (13) of the stand (12) is in interference fit with the bottom of the first horizontal frame (10), the top latch (13) of the second horizontal frame (11) is in interference fit with the bottom of the stand (12), and the top latch (13) of the bottom stand (12) is in interference fit with the bottom of the top stand (12).

6. The assembled magic cube structure barycenter measuring device for theoretical mechanics teaching according to claim 1, characterized in that, The first component (6), the second component (7), the third component (8) and the fourth component (9) are composed of a plurality of first partition plates (16), a horizontal bottom plate (17) and a plurality of second partition plates (18), the top of the second component (7) is evenly fixed with the first partition plate (16), the top of the second component (7) is evenly fixed with the second partition plate (18), and the first partition plate (16) and the second partition plate (18) are crosswise fixed, for forming a plurality of placing cavities on the top of the horizontal bottom plate (17).

7. The assembled cube structure barycenter measuring device for theoretical mechanics teaching according to claim 6, characterized in that, The first connecting threaded hole, the second threaded hole and the third threaded hole are respectively corresponding to the threaded hole (15) in the corresponding cover plate (5).

8. The assembled cube structure gravity center measuring device for teaching theoretical mechanics according to any one of claims 1-7, characterized in that, A steel ball is also included for being put into the inside of the placing cavity to provide different counterweight modes.

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