A compression bar stability experiment teaching device

Abstract

The application discloses a kind of compression bar stable experiment teaching device, including experimental frame, experimental compression bar, fast locking universal ball hinge support, lateral support device, dynamometer, loading device.Two fast locking universal ball hinge supports are oppositely arranged, one is fixed in the bottom center of experimental frame, and the other is fixed on loading device;Experimental compression bar is a equal cross-section bar with spherical body at both ends, experimental compression bar is vertically arranged in the inside of experimental frame, and the spherical body at both ends is pressed into one fast locking universal ball hinge support;Loading device is used to apply vertical downward load, and dynamometer is arranged at the load output end of loading device;Multiple lateral support devices are connected to experimental frame, for multidirectional support to the side of experimental compression bar.The device has the advantages of clear principle, intuitive demonstration, easy operation and convenient carrying, and can comprehensively and intuitively demonstrate the influence of individual action and coupling action of various factors on the stability of compression bar.

Description

Technical Field

[0001] This invention relates to an experimental teaching device, specifically a pressure bar stabilization experimental teaching device. Background Technology

[0002] The stability of axially compressed members (referred to as "compression member stability") is a required course for majors in civil engineering, mechanics, and other related disciplines. There are three buckling modes in compression members: bending buckling, torsional buckling, and flexural-torsional buckling, each corresponding to a different buckling mechanism. Compression members with biaxially symmetric cross-sections (excluding cruciform cross-sections) generally experience bending buckling. Compression members with thin-walled cruciform cross-sections generally experience torsional buckling. For compression members with a single-axisymmetric cross-section, flexural-torsional buckling occurs when the member buckles about its axis of symmetry; bending buckling occurs when the member buckles about its asymmetric axis. Besides the cross-sectional shape, the geometric length of the compression member, the support conditions at the ends, and the location (opposite to the strong or weak axis, height), number, and stiffness of lateral supports all affect stability.

[0003] As can be seen from the above, stability problems are highly theoretical, abstract, and difficult to learn. Using teaching devices for classroom demonstrations is an intuitive and efficient teaching method. Currently used teaching devices or experimental teaching devices can only conduct bending instability experiments, but cannot conduct torsional instability and bending-torsional instability experiments. They also cannot consider the influence of the location, number, and stiffness of supports, and are difficult to use for intuitive classroom teaching demonstrations. Summary of the Invention

[0004] Purpose of the invention: In view of the above-mentioned prior art, this invention proposes an experimental teaching device for column stability, which can comprehensively and intuitively demonstrate the influence of individual and coupled effects of various factors on column stability.

[0005] Technical Solution: A teaching device for experimental pressure bar stabilization includes an experimental frame, an experimental pressure bar, quick-locking universal ball joint supports, lateral support devices, a force gauge, and a loading device. The experimental frame is located at the bottom of the entire device, and the loading device is located at the top of the entire device. Two quick-locking universal ball joint supports are arranged opposite to each other, one fixed to the center of the bottom of the experimental frame and the other fixed to the loading device. The experimental pressure bar is a uniform cross-section bar with spheres at both ends, vertically positioned inside the experimental frame, with the spheres at both ends corresponding to a quick-locking universal ball joint support. The loading device is used to apply a vertically downward load, and the force gauge is located at the load output end of the loading device. Multiple lateral support devices are connected to the experimental frame to provide multi-directional lateral support for the experimental pressure bar.

[0006] Furthermore, the quick-locking universal ball joint support includes an inner elastic sleeve and an outer locking sleeve; the inner elastic sleeve is a hollow cylinder with external threads and an inner spherical shape, and several vertical slits are opened along the circumference on the side wall of the hollow cylinder; the inner surface of the outer locking sleeve is provided with threads that match the elastic sleeve, and the elastic sleeve is locked and released by rotating the outer locking sleeve in both directions.

[0007] Furthermore, the lateral support device includes a variable cross-section support rod, a diaphragm, a grooved clamp, a spring, a spring baffle, and a grooved frame;

[0008] The diaphragm is a rectangular plate with a second circular hole in the middle and grooved clamps at both ends; the end plate of the grooved frame has a fourth circular hole in the center and horizontal grooves on both sides of the fourth circular hole; the grooved frame is fixedly connected to the diaphragm through the ends of the two side plates.

[0009] The variable cross-section support rod includes a large round rod and a small round rod; the spring baffle consists of two semi-circular plates with a semi-circular notch in the middle and two handles. The semi-circular plates are located inside the end plate of the slot frame, and the two handles fixed to the semi-circular plates pass through a slot from the inner side of the end plate.

[0010] The end of the large circular rod of the variable cross-section support rod passes through the second circular hole on the diaphragm and abuts against the side of the experimental pressure rod; the small circular rod passes through the fourth circular hole on the end plate of the slotted frame; the spring is fitted on the small circular rod of the variable cross-section support rod; the diameter of the spring is smaller than the diameter of the fourth circular hole, and one end of the spring abuts against the large circular rod; when the handle is moved to bring the two semi-circular plates together, the two middle semi-circular notches merge into a circular hole, and at this time the other end of the spring abuts against the two semi-circular plates.

[0011] Furthermore, the experimental frame includes a bottom cover, four angle steel columns, and a frame cover; the bottom cover and frame cover are fixed to the bottom and top of the four angle steel columns, respectively; one quick-locking universal ball joint support is fixed in the center of the bottom cover; several first circular holes are opened in pairs along the height direction on the two legs of the angle steel columns; the two side plates of the grooved clamp of the lateral support device are respectively opened with opposite third circular holes, and the third circular holes are connected to the first circular holes of the angle steel columns by bolts, thereby connecting the lateral support device to the experimental frame.

[0012] Furthermore, the loading device includes a pinion, a large gear, and a threaded rod; the large gear is a horizontally rotating gear disc with a threaded hole in the center; the pinion, driven by the turntable, meshes with the large gear; the threaded rod is connected to the threaded hole in the center of the large gear, and the bottom end of the threaded rod serves as the load output end of the loading device; one rotation of the large gear corresponds to one thread pitch movement of the threaded rod.

[0013] Furthermore, the loading device housing is a cylindrical shell with a bottom plate at the bottom; several limiting plates are evenly spaced along the circumference at the same height on the inner side of the cylindrical shell. The limiting plate is a rectangular plate with a groove, the groove is horizontally set towards the center of the cylinder, and the opposite surface of the groove is provided with balls; the large gear is horizontally set inside the loading device housing, and the horizontal edge of the large gear is embedded in the groove of each limiting plate.

[0014] Furthermore, the loading device also includes four round columns, a force transmission plate, and an anti-tilting plate; the four round columns are vertically fixed at the four corners of the base plate; the anti-tilting plate has round holes at the four corners for the four round columns of the loading device to pass through, and the bottom ends of the four round columns are fixed to the top four corners of the experimental frame; the bottom end of the threaded rod is connected to the force transmission plate, and a groove of a certain depth is opened on the upper surface of the anti-tilting plate for placing a force gauge. When a load is applied, the force transmission plate acts on the force gauge; another quick-locking universal ball joint support is fixed in the center of the lower surface of the anti-tilting plate.

[0015] Beneficial Effects: The experimental teaching device for column stability proposed in this invention has the advantages of clear principle, intuitive demonstration, easy operation, and portability. It can comprehensively and intuitively demonstrate the influence of individual and coupled effects of various factors on column stability. Specific advantages are as follows:

[0016] 1) The experimental pressure bar has a variety of cross-sectional shapes and the pressure bar is easy to replace.

[0017] The experimental pressure bar has three cross-sectional shapes: rectangular, cross-shaped, and T-shaped, suitable for demonstrating three typical instability modes: bending instability, torsional instability, and bending-torsional instability. The pressure bar is connected to quick-locking universal ball joint supports via spheres at both ends, making installation and disassembly convenient and allowing for rapid replacement of pressure bars for different instability modes, thus enhancing classroom demonstration efficiency.

[0018] 2) The rod end support conditions are adjustable and easy to adjust.

[0019] When the universal ball joint is loosened, the ball at the end of the experimental pressure rod can rotate freely, thus achieving a hinged connection at the rod end; locking the universal ball joint prevents the end of the experimental pressure rod from rotating, thus achieving a fixed connection at the rod end. The two ends of the experimental pressure rod can be conveniently configured to achieve three different support conditions as needed: hinged at both ends, fixed at both ends, and hinged at one end and fixed at the other end.

[0020] 3) The position of the lateral support is adjustable.

[0021] The experimental frame is equipped with lateral support devices on all four sides, allowing for support along different principal axis directions of the experimental pressure rod. These lateral support devices are height-adjustable, enabling demonstrations to accommodate different heights and numbers of supports.

[0022] 4) The stiffness of the lateral support is adjustable.

[0023] The variable cross-section support rod of this invention rests at its front end against both sides of the experimental pressure rod. By replacing springs with different stiffnesses, the lateral support stiffness can be adjusted. The original spring can be removed and a new spring can be quickly replaced by moving the spring baffle along the slot.

[0024] 5) Fine loading and convenient control.

[0025] During loading, a small gear is rotated by a hand-cranked turntable. The small gear drives the large gear, which in turn moves the threaded rod downwards to apply pressure to the end of the experimental pressure rod. One rotation of the large gear corresponds to one thread pitch movement of the threaded rod. The loading process can be stopped at any time for easy observation and explanation. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of the pressure bar stabilization experimental teaching device of the present invention;

[0027] Figure 2 This is a side view of the experimental teaching device for stabilizing the compression bar of the present invention.

[0028] Figure 3 This is a schematic diagram of the loading device;

[0029] Figure 4 This is a schematic diagram of the turntable;

[0030] Figure 5 This is a schematic diagram of a small gear;

[0031] Figure 6 This is a schematic diagram of the large gear structure;

[0032] Figure 7 This is a schematic diagram of the loading device casing;

[0033] Figure 8 This is a schematic diagram of the limiting plate;

[0034] Figure 9 This is a schematic diagram of a threaded rod;

[0035] Figure 10 This is a schematic diagram of a force transmission plate;

[0036] Figure 11 This is a schematic diagram of a circular column;

[0037] Figure 12 This is a schematic diagram of a force gauge;

[0038] Figure 13 This is a schematic diagram of an anti-tilting plate structure;

[0039] Figure 14 Cross-sectional view of the quick-locking universal ball joint support structure;

[0040] Figure 15 This is a schematic diagram of an elastic sleeve structure;

[0041] Figure 16 This is a schematic diagram of the experimental pressure bar;

[0042] Figure 17 This is a schematic diagram of the lateral support device structure;

[0043] Figure 18 This is a schematic diagram of the diaphragm structure;

[0044] Figure 19 This is a schematic diagram of a slotted frame structure;

[0045] Figure 20 This is a schematic diagram of the lateral support rod structure;

[0046] Figure 21 This is a schematic diagram of a variable cross-section supported circular rod structure;

[0047] Figure 22 This is a schematic diagram of the spring baffle structure;

[0048] Figure 23 This is a schematic diagram of the experimental framework structure;

[0049] Figure 24 This is a schematic diagram of the frame cover structure;

[0050] Figure 25 This is a schematic diagram of an angle steel column structure;

[0051] Figure 26 This is a schematic diagram of the bottom cover structure;

[0052] Figure 27 This is a schematic diagram of a bolt structure. Detailed Implementation

[0053] The invention will now be further explained with reference to the accompanying drawings.

[0054] like Figure 1 , Figure 2 As shown, a pressure bar stabilization experimental teaching device includes an experimental frame 7, an experimental pressure bar 5, a quick-locking universal ball joint support 4, a lateral support device 6, a force gauge 2, and a loading device 1.

[0055] The experimental frame 7 is located at the bottom of the entire apparatus, and the loading device 1 is located at the top. Two quick-locking universal ball joint supports 4 are arranged opposite each other, one fixed to the center of the bottom of the experimental frame 7, and the other fixed to the loading device 1. Figure 16As shown, the experimental pressure bar 5 is a uniform cross-section bar with spheres 26 at both ends. The uniform cross-section of the experimental pressure bar 5 can be rectangular, T-shaped, or cross-shaped. The experimental pressure bar 5 is centrally and vertically positioned inside the experimental frame 7, with the spheres 26 at both ends pressed into a quick-locking universal ball joint support 4. The loading device 1 is used to apply a vertically downward load, and the force gauge 2 is located at the load output end of the loading device 1. Multiple lateral support devices 6 are connected to the experimental frame 7 to provide multi-directional lateral support for the experimental pressure bar 5.

[0056] like Figures 23 to 26 As shown, the experimental frame 7 consists of a bottom cover 46, four angle steel columns 44, and a frame cover 43. The bottom cover 46 and the frame cover 43 are fixed to the bottom and top of the four angle steel columns 44, respectively. One quick-locking universal ball joint support 4 is fixed in the center of the bottom cover 46. Several first circular holes 45 are opened in pairs along the height direction on both legs of the angle steel columns 44.

[0057] like Figures 3 to 11 As shown, the loading device 1 consists of a turntable 8 with a hand crank 48, a small gear 10, a large gear 13, a threaded rod 19, a loading device housing 16, a base plate 18, four round columns 21, a force transmission plate 20, and an anti-tilting plate 3. The loading device housing 16 is a cylindrical shell with a base plate 18 at the bottom. Several limiting plates 11 are evenly spaced along the circumference at the same height on the inner side of the cylindrical shell. Each limiting plate 11 is a rectangular plate with grooves, the grooves being horizontally oriented towards the center of the cylinder, and ball bearings 15 are provided on the opposite surface of the grooves. The large gear 13 is a geared disc gear with a threaded hole 12 in the center. The large gear is horizontally positioned inside the loading device housing 16, and its horizontal edge is embedded in the grooves of each limiting plate 11, enabling good horizontal rotation through the ball bearings 15. The sleeve 14 is horizontally fixed at a position on the top of the loading device housing 16. The gear rod 9 passes through the sleeve 14. One end of the gear rod 9 is fixedly connected to the center of the vertically set small gear 10, and the other end is fixedly connected to the center of the turntable 8. The small gear 10 meshes with the large gear 13. Four round columns 21 are vertically fixed at the four corners of the base plate 18.

[0058] like Figure 13 As shown, the anti-tilt plate 3 has round holes 22 at its four corners, through which the four round columns 21 of the loading device 1 pass. A groove 23 of a certain depth is formed on the upper surface of the anti-tilt plate 3 for placing the force gauge 2. Figure 1 , Figure 2 As shown, the bottom ends of the four circular columns 21 are fixed to the four corners of the frame cover 43 of the experimental frame 7. The threaded rod 19 is connected to the threaded hole 12 in the center of the large gear 13, and after passing through the central circular hole 17 of the base plate, it is connected to the force transmission plate 20. When a load is applied, the force transmission plate 20 acts on the force gauge 2. Another quick-locking universal ball joint support 4 is fixed to the center of the lower surface of the anti-tilting plate 3.

[0059] like Figure 14 , Figure 15 As shown, the quick-locking universal ball joint support 4 consists of an inner elastic sleeve 25 and an outer locking sleeve 24. In this embodiment, the inner elastic sleeve 25 is a hollow cylinder with external threads and an inner spherical shape, and several vertical slits are opened along the circumference on the side wall of the hollow cylinder; the inner surface of the outer locking sleeve 24 is provided with threads that match those of the elastic sleeve 25, and the elastic sleeve 25 is locked and released by rotating the outer locking sleeve 24 in both directions. The length of the experimental pressure rod 5 exceeds the height of the experimental frame 7 so that the balls 26 at both ends of the experimental pressure rod 5 can be connected to the quick-locking universal ball joint support 4 respectively.

[0060] like Figures 17 to 22 As shown, the lateral support device 6 consists of a variable cross-section support rod 34, a transverse diaphragm 29, a slotted clamping plate 27, a spring 35, a spring baffle 36, and a slotted frame 31. The transverse diaphragm 29 is a rectangular plate with a second circular hole 28 in the center, and slotted clamping plates 27 at both ends. The two side plates of the slotted clamping plate 27 each have a corresponding third circular hole 30. The end plate of the slotted frame 31 has a fourth circular hole 32 in the center, and horizontal slots 33 on both sides of the fourth circular hole 32. The slotted frame 31 is fixedly connected to the transverse diaphragm 29 through the ends of the two side plates. (The text abruptly ends here, so the translation stops.) Figure 27 Bolt 47 connects the third round hole 30 to the first round hole 45 of the angle steel column 44, thereby fixing the main body of the lateral support device 6 to the experimental frame 7.

[0061] The variable cross-section support rod 34 includes a large round rod 38 and a small round rod 39. The end of the large round rod 38 is provided with a hemispherical end 37. The spring baffle 36 consists of two semi-circular plates 40 with a semi-circular notch 41 in the middle and a handle 42. The semi-circular plates 40 are located inside the end plate of the slot frame 31. The handle 42 is fixed to the semi-circular plates 40 and passes through and rests on the slot hole 33. The spring baffle 36 can be moved horizontally in the slot hole 33 using the handle 42. When the two semi-circular plates 40 are moved together, the semi-circular notch 41 in the middle is combined into a circular hole. Among them, the diameter of the large round rod 38 is smaller than the diameter of the second circular hole 28, but larger than the diameter of the spring 35; the diameter of the small round rod 39 is smaller than the diameter of the spring 35 and the diameter of the fourth circular hole 32; the diameter of the spring 35 is smaller than the diameter of the fourth circular hole 32; the diameter of the semi-circular notch 41 is smaller than the diameter of the spring 35, but larger than the diameter of the small round rod 39. The end of the large round rod 38 of the variable cross-section support rod 34 passes through the second round hole 28 on the transverse partition 29 and abuts against the side of the experimental pressure rod 5; the small round rod 39 passes through the fourth round hole 32 on the end plate of the slotted frame 31, and the spring 35 is sleeved on the small round rod 39 of the variable cross-section support rod 34. One end of the spring 35 abuts against the large round rod 38, and when the spring baffle 36 closes, the other end of the spring 35 abuts against the two semi-circular plates 40, that is, the spring 35 is blocked inside the end plate of the slotted frame 31.

[0062] Based on the above-mentioned experimental teaching device for column stability, the influence of individual and coupled effects of various factors on column stability is demonstrated. The specific process is as follows:

[0063] 1. Teaching and implementation methods for different instability modes.

[0064] The instability modes of compression members include bending instability, torsional instability, and flexural-torsional instability. Generally, compression members with biaxially symmetric sections (except for cruciform sections) typically experience bending instability. Thin-walled cruciform compression members typically experience torsional instability. For compression members with a single-axis symmetric section, flexural-torsional instability occurs when the member buckles about its axis of symmetry; bending instability occurs when the member buckles about its asymmetric axis.

[0065] (1) Bending instability:

[0066] A rectangular cross-section experimental compression bar was used, and no lateral support was provided for loading. The loading was continued until the compression bar buckled about the weak axis.

[0067] Using a rectangular cross-section experimental column, the number of lateral supports is gradually increased along the strong axis, and the load is continuously applied until the column experiences bending instability around the strong axis.

[0068] Using a T-shaped cross-section experimental column, the number of lateral supports is continuously increased along the asymmetry axis of the column, and the load is continuously applied until the column buckles around the asymmetry axis.

[0069] (2) Bending and torsional instability:

[0070] The experimental compression bar with a T-shaped cross section was subjected to continuous loading without any lateral support until the bar experienced torsional instability about its axis of symmetry.

[0071] (3) Torsional instability:

[0072] The experimental compression bar with a cross-shaped cross section was subjected to continuous loading without any lateral support until the compression bar experienced torsional instability.

[0073] 2. Teaching methods for the influence of rod end support conditions on the stability of compression members.

[0074] A test column with an arbitrary cross-sectional shape was selected. Without any support, loading was applied under three different support conditions: both ends of the column were relaxed (hinged at both ends), both ends of the column were locked (fixed at both ends), and one end was locked with one end relaxed (fixed at one end, hinged at the other). The shape change of the column under unstable conditions can be observed visually. The values ​​from the force gauges provide a direct and quantitative reflection of the quantitative impact of the end support conditions on the column's stability.

[0075] 3. Teaching methods for the influence of the position of lateral supports on the stability of compression members.

[0076] Select an experimental compression bar of any cross-sectional shape, and set supports at special locations such as the middle, third, and quarter points of the bar. Supports can also be set along two mutually perpendicular horizontal directions on the cross-section of the bar. Continuously load the bar until it becomes unstable. Visual observation can reveal the shape change of the bar's instability as the position of the lateral supports changes. Reading the force gauge readings provides a direct and quantitative indication of the quantitative impact of the lateral support position on the bar's stability.

[0077] 4. Teaching methods for the influence of lateral support stiffness on column stability.

[0078] Keeping the cross-sectional shape of the experimental column constant, and keeping the number and position of the lateral supports constant, springs of different stiffnesses were used to load the column until it became unstable. The shape change of the column when the stiffness of the lateral supports changed can be observed visually. By reading the values ​​of the force gauge, the quantitative influence of the stiffness of the lateral supports on the stability of the column can be directly reflected.

[0079] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A teaching device for experimental stabilization of a compression bar, characterized in that, The apparatus includes an experimental frame (7), an experimental pressure bar (5), a quick-locking universal ball joint support (4), a lateral support device (6), a force gauge (2), and a loading device (1). The experimental frame (7) is located at the bottom of the entire apparatus, and the loading device (1) is located at the top of the entire apparatus. Two quick-locking universal ball joint supports (4) are arranged opposite to each other, one fixed at the center of the bottom of the experimental frame (7) and the other fixed on the loading device (1). The experimental pressure bar (5) is a uniform cross-section bar with spheres (26) at both ends, and the cross-section includes rectangular, cross-shaped, and T-shaped sections. The experimental pressure bar (5) is vertically positioned in the center inside the experimental frame (7), with the spheres (26) at both ends pressed into a quick-locking universal ball joint support (4); the loading device (1) is used to apply a vertically downward load, and the force gauge (2) is set at the load output end of the loading device (1); multiple lateral support devices (6) are connected to the experimental frame (7) to provide multi-directional support for the sides of the experimental pressure bar (5); the demonstration of three instability modes, namely bending, torsion, and bending-torsion, is realized; The quick-locking universal ball joint support (4) includes an inner elastic sleeve (25) and an outer locking sleeve (24); the inner elastic sleeve (25) is a hollow cylinder with external threads and an inner spherical shape, and several vertical slits are opened along the circumference on the side wall of the hollow cylinder; the inner side of the outer locking sleeve (24) is provided with threads that match the elastic sleeve (25), and the elastic sleeve (25) is locked and released by rotating the outer locking sleeve (24) in both directions; The lateral support device (6) includes a variable cross-section support rod (34), a diaphragm (29), a grooved clamp (27), a spring (35), a spring baffle (36), and a grooved frame (31); The diaphragm (29) is a rectangular plate with a second round hole (28) in the middle and grooved clamps (27) at both ends; the end plate of the grooved frame (31) has a fourth round hole (32) in the center and horizontal grooves (33) on both sides of the fourth round hole (32); the grooved frame (31) is fixedly connected to the diaphragm (29) through the ends of the two side plates. The variable cross-section support rod (34) includes a large round rod (38) and a small round rod (39); the spring baffle (36) consists of two semi-circular plates (40) with a semi-circular notch (41) in the middle and two handles (42). The semi-circular plate (40) is located inside the end plate of the slot frame (31), and the two handles (42) fixed to the semi-circular plate (40) pass through a slot (33) from the inside of the end plate. The end of the large round rod (38) of the variable cross-section support rod (34) passes through the second round hole (28) on the diaphragm (29) and then abuts against the side of the experimental pressure rod (5); the small round rod (39) passes through the fourth round hole (32) on the end plate of the slot frame (31); the spring (35) is sleeved on the small round rod (39) of the variable cross-section support rod (34); the diameter of the spring (35) is smaller than the diameter of the fourth round hole (32), and one end of the spring (35) abuts against the large round rod (38); when the handle (42) is moved to bring the two semi-circular plates (40) together, the two middle semi-circular notches (41) merge into a round hole, and at this time the other end of the spring (35) abuts against the two semi-circular plates (40); The spring (35) can be quickly replaced to adjust the support stiffness.

2. The experimental teaching device for stabilizing a compression bar according to claim 1, characterized in that, The experimental frame (7) includes a bottom cover (46), four angle steel columns (44), and a frame cover (43); the bottom cover (46) and the frame cover (43) are fixed to the bottom and top of the four angle steel columns (44), respectively; one of the quick-locking universal ball joint supports (4) is fixed in the center of the bottom cover (46); several first round holes (45) are opened in pairs along the height direction on the two legs of the angle steel column (44); the two side plates of the groove-shaped clamp (27) of the lateral support device (6) are respectively opened with opposite third round holes (30), and the third round holes (30) are connected to the first round holes (45) of the angle steel column (44) by bolts (47), thereby connecting the lateral support device (6) to the experimental frame (7).

3. The experimental teaching device for stabilizing a compression bar according to claim 1, characterized in that, The loading device (1) includes a pinion (10), a large gear (13), and a threaded rod (19). The large gear (13) is a horizontally rotating gear with a threaded hole (12) in the center. The pinion (10) driven by the turntable (8) meshes with the large gear (13). The threaded rod (19) is connected to the threaded hole (12) in the center of the large gear (13), and the bottom end of the threaded rod (19) serves as the load output end of the loading device (1). When the large gear (13) rotates one revolution, the threaded rod (19) moves one thread pitch.

4. The experimental teaching device for stabilizing a compression bar according to claim 3, characterized in that, The loading device housing (16) is a cylindrical shell with a bottom plate (18) at the bottom. Several limiting plates (11) are evenly spaced along the circumference at the same height on the inner side of the cylindrical shell. The limiting plate (11) is a rectangular plate with a groove, the groove is horizontally set towards the center of the cylinder, and the opposite surface of the groove is provided with balls (15). The large gear (13) is horizontally set inside the loading device housing (16), and the horizontal edge of the large gear (13) is embedded in the groove of each limiting plate (11).

5. The experimental teaching device for stabilizing a compression bar according to claim 4, characterized in that, The loading device (1) also includes four round columns (21), a force transmission plate (20), and an anti-tilting plate (3); the four round columns (21) are vertically fixed at the four corners of the base plate (18); the anti-tilting plate (3) has round holes (22) at the four corners, through which the four round columns (21) of the loading device (1) pass, and the bottom ends of the four round columns (21) are fixed to the top four corners of the experimental frame (7); the bottom end of the threaded rod (19) is connected to the force transmission plate (20), and a groove (23) of a certain depth is opened on the upper surface of the anti-tilting plate (3) for placing the force gauge (2). When the load is applied, the force transmission plate (20) acts on the force gauge (2); another quick-locking universal ball joint support (4) is fixed in the center of the lower surface of the anti-tilting plate (3).

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