阅读说明：本技术 一种物理实验用演示装置及其使用方法 (Demonstration device for physical experiment and using method thereof ) 是由 潘欣雨 于 2021-08-16 设计创作，主要内容包括：本发明公开了一种物理实验用演示装置及其使用方法,涉及物理实验演示技术领域,包括：底座,呈中空形,所述底座的内底部焊接有第一支撑杆与立板,所述第一支撑杆的外壁上滑动连接有第一外管,所述第一外管远离第一支撑杆的一端通过支撑盘连接有演示平台；支撑架,固定连接在所述底座的内壁上,所述支撑架的表面固定连接有电机,所述电机的输出端通过联轴器固定连接有第一转杆,所述第一转杆贯穿立板,且第一转杆通过轴承与立板转动连接；高度调节机构,位于立板的表面,固定连接在所述第一转杆输出端,通过对高度调节机构的设计,方便对演示平台进行高度调节,使台下学生能够全部看见实验设备的操作过程以及实验设备的显示数据,使用方便。(The invention discloses a demonstration device for a physical experiment and a using method thereof, relating to the technical field of physical experiment demonstration and comprising the following steps: the demonstration device comprises a base, a first support rod, a vertical plate, a first outer pipe and a demonstration platform, wherein the base is hollow, the first support rod and the vertical plate are welded at the inner bottom of the base, the outer wall of the first support rod is connected with the first outer pipe in a sliding mode, and one end, far away from the first support rod, of the first outer pipe is connected with the demonstration platform through a support plate; the support frame is fixedly connected to the inner wall of the base, the surface of the support frame is fixedly connected with a motor, the output end of the motor is fixedly connected with a first rotating rod through a coupler, the first rotating rod penetrates through the vertical plate, and the first rotating rod is rotatably connected with the vertical plate through a bearing; height adjusting mechanism is located the surface of riser, and fixed connection is in first bull stick output through the design to height adjusting mechanism, conveniently carries out altitude mixture control to the demonstration platform, makes the student under the platform can all see experimental facilities's operation process and experimental facilities's display data, convenient to use.)

1. A demonstration apparatus for physics experiments, comprising:

the demonstration device comprises a base (1) in a hollow shape, wherein a first supporting rod (8) and a vertical plate (16) are welded at the inner bottom of the base (1), a first outer pipe (12) is connected to the outer wall of the first supporting rod (8) in a sliding mode, and one end, far away from the first supporting rod (8), of the first outer pipe (12) is connected with a demonstration platform (2) through a supporting plate (10);

the supporting frame (3) is fixedly connected to the inner wall of the base (1), the surface of the supporting frame (3) is fixedly connected with a motor (4), the output end of the motor (4) is fixedly connected with a first rotating rod (5) through a coupler, the first rotating rod (5) penetrates through the vertical plate (16), and the first rotating rod (5) is rotatably connected with the vertical plate (16) through a bearing;

and the height adjusting mechanism (6) is positioned on the surface of the vertical plate (16) and is fixedly connected to the output end of the first rotating rod (5).

2. A demonstration apparatus for physical experiments according to claim 1, wherein: the height adjusting mechanism (6) comprises a circular ring disc (61) and a hook-shaped plate (614) which are rotatably connected to the surface of a vertical plate (16), a first driving plate (62) and a second driving plate (63) are welded to the surface of the circular ring disc (61), a supporting block (66) is welded to one end, away from the circular ring disc (61), of the hook-shaped plate (614), a sliding column (611) and a first fixing column (613) are arranged on one side, away from the circular ring disc (61), of the hook-shaped plate (614), a moving plate (64) is connected to the outer wall of the sliding column (611) in a sliding mode, a first limiting block (67) and a second limiting block (68) are welded to one side, close to the circular ring disc (61), of the moving plate (64) is welded to the other side, a third limiting block (69) is welded to the other side of the moving plate (64), and the third limiting block (69) is matched with the first fixing column (613).

3. A demonstration apparatus for physical experiments according to claim 2, wherein: the surface of the moving plate (64) is provided with a first sliding groove (610), the first sliding groove (610) is matched with a sliding column (611), one end of the sliding column (611) is welded with the vertical plate (16), and the other end of the sliding column (611) is welded with a fixing plate (612).

4. A demonstration apparatus for physical experiments according to claim 2, wherein: the first driving plate (62) and the first limiting block (67) are located on the same plane, the second driving plate (63) and the hook plate (614) are located on the same plane, the first driving plate (62) and the second driving plate (63) are located on different planes, and the supporting block (66) and the second limiting block (68) are matched with each other.

5. A demonstration apparatus for physical experiments according to claim 2, wherein: the upper end welding of movable plate (64) has supporting disk (10), open the surface of supporting disk (10) has second spout (11), the bottom welding of demonstration platform (2) has sliding ring (9), sliding ring (9) run through supporting disk (10), and sliding ring (9) sliding connection is in second spout (11).

6. A demonstration apparatus for physical experiments according to claim 2, wherein: an auxiliary assembly (65) is arranged in an inner cavity of the circular ring disc (61), the auxiliary assembly (65) comprises a screw rod (652) rotatably connected with the base (1), a knob (651) is welded at one end of the screw rod (652), the other end of the screw rod (652) is rotatably connected with a second fixed column (653) through a bearing, the second fixed column (653) is fixedly connected with the first rotating rod (5), a moving block (657) is connected to the outer wall of the screw rod (652) in a threaded manner, a first movable plate (654) is hinged to the outer wall of the moving block (657), a second movable plate (655) is hinged to the outer wall of the second fixed column (653), and an engaging plate (656) is hinged between the first movable plate (654) and the second movable plate (655).

7. A demonstration apparatus for physical experiments according to claim 1, wherein: third spout (13) have been opened to the symmetry on the inner wall of first outer tube (12), sliding connection has first slider (14) in third spout (13), first slider (14) and first bracing piece (8) fixed connection, be provided with first spring (15) in the inner chamber of first outer tube (12), the one end and first bracing piece (8) fixed connection of first spring (15), the other end and supporting disk (10) fixed connection of first spring (15).

8. A demonstration apparatus for physical experiments according to claim 1, wherein: the bottom of demonstration platform (2) is provided with rotary mechanism (7), rotary mechanism (7) include with first bull stick (5) coaxial fixed connection's first bevel gear (71), the meshing of the upper end of first bevel gear (71) is connected with second bevel gear (72), the one end fixedly connected with electro-magnet (73) of second bevel gear (72), the other end of second bevel gear (72) is passed through second bull stick (74) and is connected with support frame (3) rotation, be provided with magnet (75) directly over electro-magnet (73), the upper end fixedly connected with second bracing piece (76) of magnet (75), sliding connection has second outer tube (77) on the outer wall of second bracing piece (76), second outer tube (77) and demonstration platform (2) fixed connection.

9. A demonstration apparatus for physical experiments according to claim 8, wherein: fixedly connected with second spring (710) in the inner chamber of second outer tube (77), the lower extreme and second bracing piece (76) fixed connection of second spring (710), the symmetry is opened on the inner wall of second outer tube (77) has fourth spout (78), sliding connection has second slider (79) in fourth spout (78), second slider (79) and second bracing piece (76) fixed connection.

10. A method of using the demonstration apparatus for physical experiment according to claim 9, comprising the steps of:

s1: rotating a knob (651) to enable the connecting plate (656) to be tightly attached to the inner wall of the circular disc (61);

s2: the starting motor (4) drives the first rotating rod (5) to rotate, so that the circular ring disc (61) rotates, the first driving plate (62) and the second driving plate (63) are driven by the rotation of the circular ring disc (61) to rotate, and the height of the demonstration platform (2) is adjusted through the mutual matching between the first driving plate (62) and the first limiting block (67) and between the second driving plate (63) and the hook plate (614);

s3: rotating a knob (651) to separate the connecting plate (656) and the circular disc (61) from each other, changing the magnetic direction of the electromagnet (73), and enabling the electromagnet (73) and the magnet (75) to attract each other and cling together;

s4: the starting motor (4) drives the first rotating rod (5) to rotate, so that the first bevel gear (71) rotates, and the rotation of the first bevel gear (71) drives the second bevel gear (72) to rotate, so that the demonstration platform (2) rotates, and the angle of the demonstration platform (2) is adjusted.

Technical Field

The invention relates to the technical field of physical experiment demonstration, in particular to a demonstration device for a physical experiment and a using method thereof.

Background

At present, physics is a discipline based on experiments, and a plurality of laws are introduced and verified through experiments. In order to show the physical experiments in teaching, various devices are required to be used simultaneously, and the physical experiments can be well shown to students.

Present laboratory bench, mr are in the demonstration operation of carrying out the experiment, because the altitude mixture control of most demonstration equipment is comparatively loaded down with trivial details or can not carry out altitude mixture control, lead to the unable whole operation process who sees experimental facilities of off-table student and experimental facilities's display data, use inconvenient.

Disclosure of Invention

The invention provides a demonstration device for a physical experiment and a using method thereof, and aims to solve the problem that most of demonstration devices in the prior art are complicated in height adjustment or cannot be adjusted in height.

In order to solve the problems, the invention adopts the following technical scheme:

the utility model provides a presentation device for physics experiments, includes base, support frame and height adjusting mechanism, through the design to height adjusting mechanism, conveniently carries out altitude mixture control to demonstration platform, makes the student under the platform can all see experimental facilities's operation process and experimental facilities's display data, convenient to use.

The base is hollow, a first supporting rod and a vertical plate are welded at the inner bottom of the base, a first outer pipe is connected to the outer wall of the first supporting rod in a sliding mode, one end, far away from the first supporting rod, of the first outer pipe is connected with a demonstration platform through a supporting plate, and the demonstration platform can be guaranteed to be stable through mutual matching of the first outer pipe, the first supporting rod and the height adjusting mechanism.

Wherein, the support frame fixed connection be in on the inner wall of base, the fixed surface of support frame is connected with the motor, and the motor is the motor that just reverses, the first bull stick of shaft coupling fixedly connected with is passed through to the output of motor, first bull stick runs through the riser, and just first bull stick passes through the bearing and is connected with the riser rotation, and the riser plays the supporting role to first bull stick.

The height adjusting mechanism is located on the surface of the vertical plate and fixedly connected to the output end of the first rotating rod.

As a preferable scheme of the invention, the height adjusting mechanism comprises an annular disc and a hook-shaped plate which are rotatably connected to the surface of a vertical plate, a first driving plate and a second driving plate are welded on the surface of the annular disc, a supporting block is welded at one end, far away from the annular disc, of the hook-shaped plate, a sliding column and a first fixed column are arranged at one side, far away from the annular disc, of the hook-shaped plate, a moving plate is connected to the outer wall of the sliding column in a sliding mode, a first limiting block and a second limiting block are welded at one side, close to the annular disc, of the moving plate, a third limiting block is welded at the other side of the moving plate, and the third limiting block is matched with the first fixed column.

As a preferable scheme of the invention, a first sliding groove is formed on the surface of the moving plate, the first sliding groove is matched with a sliding column, one end of the sliding column is welded with the vertical plate, and a fixing plate is welded at the other end of the sliding column.

As a preferable scheme of the present invention, the first driving plate and the first limiting block are located on the same plane, the second driving plate and the hook plate are located on the same plane, the first driving plate and the second driving plate are located on different planes, and the supporting block and the second limiting block are matched with each other.

As a preferable scheme of the invention, a supporting disk is welded at the upper end of the moving plate, a second sliding groove is formed in the surface of the supporting disk, a sliding ring is welded at the bottom of the demonstration platform, the sliding ring penetrates through the supporting disk, and the sliding ring is connected in the second sliding groove in a sliding manner.

As a preferable scheme of the invention, an auxiliary assembly is arranged in an inner cavity of the circular ring disc, the auxiliary assembly comprises a screw rod rotatably connected with the base, a knob is welded at one end of the screw rod, a second fixed column is rotatably connected at the other end of the screw rod through a bearing, the second fixed column is fixedly connected with the first rotating rod, a moving block is in threaded connection with the outer wall of the screw rod, a first movable plate is hinged to the outer wall of the moving block, a second movable plate is hinged to the outer wall of the second fixed column, and an engaging plate is hinged between the first movable plate and the second movable plate.

As a preferable scheme of the present invention, third sliding grooves are symmetrically formed on an inner wall of the first outer tube, a first sliding block is slidably connected to the third sliding grooves, the first sliding block is fixedly connected to the first supporting rod, a first spring is disposed in an inner cavity of the first outer tube, one end of the first spring is fixedly connected to the first supporting rod, and the other end of the first spring is fixedly connected to the supporting plate.

As a preferable scheme of the invention, a rotating mechanism is arranged at the bottom of the demonstration platform, the rotating mechanism comprises a first bevel gear coaxially and fixedly connected with a first rotating rod, the upper end of the first bevel gear is engaged and connected with a second bevel gear, one end of the second bevel gear is fixedly connected with an electromagnet, the other end of the second bevel gear is rotatably connected with a support frame through a second rotating rod, a magnet is arranged right above the electromagnet, the upper end of the magnet is fixedly connected with a second supporting rod, a second outer tube is connected to the outer wall of the second supporting rod in a sliding manner, and the second outer tube is fixedly connected with the demonstration platform.

As a preferable scheme of the present invention, a second spring is fixedly connected in an inner cavity of the second outer tube, a lower end of the second spring is fixedly connected with the second support rod, fourth sliding grooves are symmetrically formed on an inner wall of the second outer tube, second sliding blocks are slidably connected in the fourth sliding grooves, and the second sliding blocks are fixedly connected with the second support rod.

As a preferable aspect of the present invention, a method for using the demonstration apparatus for physical experiments includes the following steps:

s1: rotating the knob to make the connecting plate closely fit with the inner wall of the circular ring disc;

s2: the starting motor drives the first rotating rod to rotate, so that the circular ring disc rotates, the rotation of the circular ring disc drives the first driving plate and the second driving plate to rotate, and the height of the demonstration platform is adjusted through the mutual matching between the first driving plate and the first limiting block and between the second driving plate and the hook plate;

s3: rotating the knob to separate the connecting plate from the circular ring disc and change the magnetic direction of the electromagnet to attract the electromagnet and the magnet tightly;

s4: the starting motor drives the first rotating rod to rotate, so that the first bevel gear rotates, and the rotation of the first bevel gear drives the second bevel gear to rotate, so that the demonstration platform rotates, and the angle of the demonstration platform is adjusted.

Compared with the prior art, the invention has the advantages that:

(1) the connecting plate is tightly attached to the inner wall of the circular ring disc by rotating the knob, the circular ring disc is driven to rotate by the starting motor, the first driving plate and the second driving plate are driven to rotate by the rotation of the circular ring disc, when the first driving plate is contacted with the first limiting block, the moving plate is vertically moved upwards under the pushing action of the first driving plate until the second limiting block is contacted with the upper surface of the supporting block, when the second driving plate is contacted with the hook-shaped plate, the hook-shaped plate is deflected under the pushing action of the second driving plate, so that the second limiting block is separated from the supporting block, under the action of the self gravity of the moving plate, the moving plate is vertically moved downwards until the third limiting block is contacted with the first fixed column, so that the height of the demonstration platform is adjusted as required, and students under the platform can completely see the operation process of the experimental equipment and the display data of the experimental equipment, is convenient to use.

(2) The knob is rotated, the connecting plate and the circular ring disc are separated from each other, the magnetic direction of the electromagnet is changed, the electromagnet and the magnet attract each other and are tightly attached together, the starting motor drives the first rotating rod to rotate, the first rotating rod rotates to drive the first bevel gear to rotate, the first bevel gear rotates to drive the second bevel gear to rotate, under the action of the second supporting rod and the second outer tube, the second bevel gear rotates to drive the demonstration platform to rotate, the angle of the demonstration platform is adjusted, and therefore students at all angles under the platform can see all surfaces of the demonstration equipment clearly.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic diagram of the internal structure of the base in the embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a first outer tube and a support plate according to an embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view A-A of FIG. 2 according to the present invention;

FIG. 5 is an enlarged view of the structure at B in FIG. 4 according to the present invention;

fig. 6 is an enlarged view of the structure at C in fig. 4 according to the present invention.

The reference numbers in the figures illustrate:

1. a base; 2. a demonstration platform; 3. a support frame; 4. a motor; 5. a first rotating lever; 6. a height adjustment mechanism; 61. a ring plate; 62. a first drive plate; 63. a second drive plate; 64. moving the plate; 65. an auxiliary component; 651. a knob; 652. a screw; 653. a second fixed column; 654. a first movable plate; 655. a second movable plate; 656. a connector tile; 657. a moving block; 66. a support block; 67. a first stopper; 68. a second limiting block; 69. a third limiting block; 610. a first chute; 611. a traveler; 612. a fixing plate; 613. a first fixed column; 614. a hook-shaped plate; 7. a rotation mechanism; 71. a first bevel gear; 72. a second bevel gear; 73. an electromagnet; 74. a second rotating rod; 75. a magnet; 76. a second support bar; 77. a second outer tube; 78. a fourth chute; 79. a second slider; 710. a second spring; 8. a first support bar; 9. a slip ring; 10. a support disc; 11. a second chute; 12. a first outer tube; 13. a third chute; 14. a first slider; 15. a first spring; 16. a vertical plate.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example (b):

referring to fig. 1-2, a demonstration apparatus for physical experiments comprises a base 1, a support frame 3 and a height adjusting mechanism 6, wherein the height adjusting mechanism 6 is designed to conveniently adjust the height of a demonstration platform 2, so that students under a table can completely see the operation process of experimental equipment and the display data of the experimental equipment, and the use is convenient.

Wherein, base 1 is the cavity shape, and the welding of base 1's interior bottom has first bracing piece 8 and riser 16, and sliding connection has first outer tube 12 on the outer wall of first bracing piece 8, and the one end that first bracing piece 8 was kept away from to first outer tube 12 is connected with demonstration platform 2 through supporting disk 10, through the mutually supporting between first outer tube 12, first bracing piece 8 and the height adjusting mechanism 6, can guarantee demonstration platform 2's stability.

Wherein, support frame 3 fixed connection is on the inner wall of base 1, and the fixed surface of support frame 3 is connected with motor 4, and motor 4 is just reversing motor, and the first bull stick 5 of shaft coupling fixedly connected with is passed through to the output of motor 4, and first bull stick 5 runs through riser 16, and just first bull stick 5 rotates with riser 16 through the bearing to be connected, and riser 16 plays the supporting role to first bull stick 5.

Wherein, height adjusting mechanism 6 is located the surface of riser 16, and height adjusting mechanism 6 fixed connection is at the first bull stick 5 output.

Referring to fig. 2, the height adjusting mechanism 6 includes an annular disc 61 and a hook plate 614 rotatably connected to the surface of the vertical plate 16, a first driving plate 62 and a second driving plate 63 are welded to the surface of the annular disc 61, a supporting block 66 is welded to one end of the hook plate 614 away from the annular disc 61, a sliding column 611 and a first fixed column 613 are arranged on one side of the hook plate 614 away from the annular disc 61, a moving plate 64 is slidably connected to the outer wall of the sliding column 611, a first limiting block 67 and a second limiting block 68 are welded to one side of the moving plate 64 close to the annular disc 61, a third limiting block 69 is welded to the other side of the moving plate 64, and the third limiting block 69 and the first fixed column 613 are matched with each other.

The specific adjustment process of the first height is as follows: the starting motor 4 drives the first rotating rod 5 to rotate, the first rotating rod 5 rotates to drive the circular ring disc 61 to rotate, the circular ring disc 61 rotates to drive the first driving plate 62 and the second driving plate 63 to rotate, the first driving plate 62 is contacted with the first limiting block 67, the moving plate 64 is vertically moved upwards under the pushing action of the first driving plate 62 until the second limiting block 68 is contacted with the upper surface of the supporting block 66, and at the moment, the supporting block 66 supports the second limiting block 68, so that the height of the demonstration platform 2 is adjusted.

Referring to fig. 2, the surface of the moving plate 64 is provided with a first sliding groove 610, the first sliding groove 610 and the sliding column 611 are matched with each other, one end of the sliding column 611 is welded to the vertical plate 16, the moving plate 64 is convenient to move on the outer wall of the sliding column 611 through the mutual matching between the first sliding groove 610 and the sliding column 611, the other end of the sliding column 611 is welded with a fixing plate 612, and the tilting phenomenon during the moving process of the moving plate 64 is avoided through the design of the fixing plate 612.

Referring to fig. 2, in order to facilitate the control of the first driving plate 62 on the first stopper 67, the first driving plate 62 and the first stopper 67 are located on the same plane, and in order to facilitate the control of the second driving plate 63 on the hook plate 614, the second driving plate 63 and the hook plate 614 are located on the same plane, and in order to prevent the mutual interference between the motions of the first driving plate 62 and the second driving plate 63, the first driving plate 62 and the second driving plate 63 are located on different planes, and the supporting block 66 and the second stopper 68 are matched with each other.

The specific adjustment process for the second height is: the starting motor 4 drives the first rotating rod 5 to rotate, the rotation of the first rotating rod 5 drives the circular ring disc 61 to rotate, the rotation of the circular ring disc 61 drives the first driving plate 62 and the second driving plate 63 to rotate, the second driving plate 63 is in contact with the hook-shaped plate 614, the hook-shaped plate 614 deflects under the pushing action of the second driving plate 63, so that the second limiting block 68 is separated from the supporting block 66, and the moving plate 64 vertically moves downwards under the action of the self gravity of the moving plate 64 until the third limiting block 69 is in contact with the first fixed column 613.

Referring to fig. 2-3, a supporting plate 10 is welded at the upper end of the moving plate 64, a second sliding groove 11 is formed in the surface of the supporting plate 10, a sliding ring 9 is welded at the bottom of the demonstration platform 2, the sliding ring 9 penetrates through the supporting plate 10, the sliding ring 9 is slidably connected in the second sliding groove 11, the sliding ring 9 and the second sliding groove 11 are matched with each other, so that the demonstration platform 2 can rotate conveniently, and meanwhile, the supporting plate 10 supports the demonstration platform 2.

Referring to fig. 4-5, an auxiliary assembly 65 is disposed in an inner cavity of the circular ring plate 61, the auxiliary assembly 65 includes a screw 652 rotatably connected to the base 1, a knob 651 is welded at one end of the screw 652, a second fixed column 653 is rotatably connected to the other end of the screw 652 through a bearing, the second fixed column 653 is fixedly connected to the first rotating rod 5, a moving block 657 is threadedly connected to an outer wall of the screw 652, a first movable plate 654 is hinged to an outer wall of the moving block 657, a second movable plate 655 is hinged to an outer wall of the second fixed column 653, and an engaging plate 656 is hinged between the first movable plate 654 and the second movable plate 655.

The specific auxiliary process is as follows: rotatory knob 651 makes screw 652 rotate, and the rotation of screw 652 drives movable block 657 and removes, through mutually supporting between first fly leaf 654 and the second fly leaf 655, makes things convenient for linkage plate 656 to be close to circular ring dish 61 to make linkage plate 656 and the inseparable laminating of the inner wall of circular ring dish 61, at this moment, conveniently adjust the height of demonstration platform 2, rotatory knob 651 makes linkage plate 656 and circular ring dish 61 alternate segregation, at this moment, conveniently adjusts the angle of demonstration platform 2.

Referring to fig. 3, third sliding grooves 13 are symmetrically formed in the inner wall of the first outer tube 12, a first sliding block 14 is slidably connected to the third sliding grooves 13, the first sliding block 14 is fixedly connected to the first supporting rod 8, and the third sliding grooves 13 and the first sliding block 14 are matched with each other to facilitate relative movement between the first supporting rod 8 and the first outer tube 12, a first spring 15 is disposed in an inner cavity of the first outer tube 12, one end of the first spring 15 is fixedly connected to the first supporting rod 8, and the other end of the first spring 15 is fixedly connected to the supporting plate 10, so that automatic resetting of the first supporting rod 8 is facilitated by the design of the first spring 15.

Referring to fig. 4, a rotating mechanism 7 is disposed at the bottom of the demonstration platform 2, the rotating mechanism 7 includes a first bevel gear 71 coaxially and fixedly connected to the first rotating rod 5, a second bevel gear 72 is engaged with the upper end of the first bevel gear 71, an electromagnet 73 is fixedly connected to one end of the second bevel gear 72, the other end of the second bevel gear 72 is rotatably connected to the support frame 3 through a second rotating rod 74, a magnet 75 is disposed right above the electromagnet 73, a second supporting rod 76 is fixedly connected to the upper end of the magnet 75, a second outer tube 77 is slidably connected to the outer wall of the second supporting rod 76, and the second outer tube 77 is fixedly connected to the demonstration platform 2.

The specific angle adjusting process is as follows: the knob 651 is rotated to separate the connecting plate 656 from the circular ring disc 61, the magnetic direction of the electromagnet 73 is changed, the electromagnet 73 and the magnet 75 are attracted to each other and tightly attached to each other, the starting motor 4 drives the first rotating rod 5 to rotate, the first rotating rod 5 rotates to drive the first bevel gear 71 to rotate, the first bevel gear 71 rotates to drive the second bevel gear 72 to rotate, and under the action of the second supporting rod 76 and the second outer tube 77, the second bevel gear 72 rotates to drive the demonstration platform 2 to rotate, so that the angle of the demonstration platform 2 is adjusted.

Referring to fig. 6, a second spring 710 is fixedly connected in an inner cavity of the second outer tube 77, a lower end of the second spring 710 is fixedly connected with the second support bar 76, and the second spring 710 is designed to facilitate automatic resetting of the second support bar 76, the inner wall of the second outer tube 77 is symmetrically provided with fourth sliding grooves 78, the fourth sliding grooves 78 are slidably connected with second sliding blocks 79, the second sliding blocks 79 are fixedly connected with the second support bar 76, and the second sliding blocks 78 and the second sliding blocks 79 are matched with each other to facilitate relative movement between the second support bar 76 and the second outer tube 77.

A use method of the demonstration device for the physical experiment comprises the following steps:

s1: rotating the knob 651 to enable the connecting plate 656 to be tightly attached to the inner wall of the circular ring disc 61;

s2: the starting motor 4 drives the first rotating rod 5 to rotate, so that the circular ring disc 61 rotates, the rotation of the circular ring disc 61 drives the first driving plate 62 and the second driving plate 63 to rotate, and the height of the demonstration platform 2 is adjusted through the mutual matching between the first driving plate 62 and the first limiting block 67 and between the second driving plate 63 and the hook plate 614;

s3: rotating the knob 651 to separate the connecting plate 656 from the circular disc 61, and changing the magnetic direction of the electromagnet 73 to attract and cling the electromagnet 73 and the magnet 75;

s4: the starting motor 4 drives the first rotating rod 5 to rotate, so that the first bevel gear 71 rotates, and the rotation of the first bevel gear 71 drives the second bevel gear 72 to rotate, so that the demonstration platform 2 rotates, and the angle of the demonstration platform 2 is adjusted.

The working principle of the embodiment is as follows:

first height adjustment: the screw 652 is rotated by the rotating knob 651, the moving block 657 is driven by the rotation of the screw 652, the first movable plate 654 and the second movable plate 655 are matched with each other, so that the connecting plate 656 is convenient to approach the circular disk 61, the connecting plate 656 is tightly attached to the inner wall of the circular disk 61, the starting motor 4 drives the first rotating rod 5 to rotate, the first rotating rod 5 drives the second fixed column 653 to rotate, the circular disk 61 is driven to rotate by the rotation of the second fixed column 653 under the action of the connecting plate 656, the first driving plate 62 and the second driving plate 63 are driven to rotate by the rotation of the circular disk 61, the first driving plate 62 is in contact with the first limiting block 67, the moving plate 64 is vertically moved upwards under the pushing action of the first driving plate 62 until the second limiting block 68 is in contact with the upper surface of the supporting block 66, and at this time, the supporting block 66 plays a supporting role on the second limiting block 68, thereby adjusting the height of the demonstration platform 2;

and (3) second height adjustment: the connecting plate 656 is tightly attached to the inner wall of the circular disc 61 by the rotary knob 651, the starting motor 4 drives the first rotating rod 5 to rotate, the circular disc 61 is driven to rotate by the rotation of the first rotating rod 5, the first driving plate 62 and the second driving plate 63 are driven to rotate by the rotation of the circular disc 61, the second driving plate 63 is in contact with the hook plate 614, the hook plate 614 deflects under the pushing action of the second driving plate 63, so that the second limiting block 68 and the supporting block 66 are separated from each other, and the moving plate 64 vertically moves downwards under the action of the self gravity of the moving plate 64 until the third limiting block 69 is in contact with the first fixed column 613.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the equivalent replacement or change according to the technical solution and the modified concept of the present invention should be covered by the scope of the present invention.