A multi-purpose adjustable teaching display device

Abstract

The utility model provides a kind of adjustable teaching display device of multipurpose, it is related to teaching display field.The utility model provides a kind of adjustable teaching display device of multipurpose, which is characterized by comprising box, middle part pipe is equipped between main wind shell and collection box, air inlet pipe is fixedly connected on the box wall of collection box, air outlet pipe is equipped on the shell wall of main wind shell.The utility model provides a kind of adjustable teaching display device of multipurpose, by starting motor to make output end drive driving shaft rotation, make base drive display board rotate, it can conveniently show the content on multi-angle display writing board, so that students can clearly view teaching content;By the rotation of the second gear on driving shaft drive chain drive the rotation of the first gear on horizontal shaft, the airflow formed by the rotation of the suction fan blade at one end of long rod in main wind shell, the dust in collection shell can automatically enter collection box through connecting pipe, to conveniently complete the collection of dust.

Description

Technical Field

[0001] This invention relates to the field of teaching demonstrations, and more particularly to a multi-purpose adjustable teaching demonstration device. Background Technology

[0002] In some teaching demonstrations, especially in economics and management, graphics and data are used for analysis and explanation to help students understand the teaching content more clearly. Traditional manual drawing methods take a lot of time, which directly affects the teaching efficiency of teachers. In order to save drawing time, teaching demonstration devices are often used to assist in teaching.

[0003] Existing teaching demonstration devices present several problems during use. Due to the large classroom space and the fixed angle of the writing boards on these devices, glare easily occurs on the surface, directly affecting the ability of students in less prominent seats to clearly see the teaching content. Furthermore, chalk dust naturally falls onto the tabletop of the demonstration device each time the writing board is written or erased, requiring the chalk dust to be cleaned off after each use, which is quite cumbersome.

[0004] Therefore, it is necessary to provide a new, multi-purpose, adjustable teaching and display device to solve the above-mentioned technical problems. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a multi-purpose adjustable teaching and display device.

[0006] The present invention provides a multi-purpose adjustable teaching display device comprising: a housing, both ends of which are provided with arc-shaped limiting seats; an internal plate fixedly connected to the interior of the housing; a base at the upper end of the housing; a rotating shaft fixedly connected to the middle of the base; the lower end of the rotating shaft being rotatably connected to the internal plate; a display board fixedly connected to the base; a graphic display component at one end of the display board; a writing board at the other end of the display board; a display screen mounted on the side wall of the display board; a collection shell at the lower end of the writing board; a collection box at the bottom of the housing; a main air shell at one end of the collection box; a central pipe between the main air shell and the collection box; an air inlet pipe fixedly connected to the wall of the collection box; and an air outlet pipe on the wall of the main air shell.

[0007] Preferably, the housing is equipped with an automatic rotation mechanism, which includes a rotating gear fixedly connected to a rotating shaft. The internal plate is provided with a boss, and a rack plate is slidably connected to the boss. The rack plate meshes with the rotating gear. A motor is installed on the side wall of the housing, and a drive shaft is fixedly connected to the output end of the motor. The other end of the drive shaft is rotatably connected to the boss. A connecting block is fixedly connected to one end of the rack plate. The drive shaft is a threaded rod, and the connecting block is threadedly connected to the drive shaft.

[0008] Preferably, each of the two arc-shaped limiting seats is provided with a limiting groove, the base is rotatably connected to the two arc-shaped limiting seats, and the side wall of the base is provided with multiple embedded guide wheels.

[0009] Preferably, a vertical plate is fixedly connected to one end of the built-in plate, and a transmission mechanism is provided between the drive shaft and the vertical plate. The transmission mechanism includes a horizontal shaft, one end of which is rotatably connected to the vertical plate. A first gear is fixedly connected to the horizontal shaft, and a second gear is fixedly connected to one end of the drive shaft. A chain is provided between the first gear and the second gear. A large gear is fixedly connected to the horizontal shaft, and a long rod is rotatably connected to the lower end of the vertical plate. A small gear is fixedly connected to the long rod, and the large gear and the small gear mesh with each other.

[0010] Preferably, an automatic cleaning mechanism is provided between the collection box and the main air casing. The automatic cleaning mechanism includes a suction fan blade, which is located inside the main air casing. The suction fan blade is fixedly connected to a long rod, one end of which extends into the interior of the collection box. One end of the central tube extends into the interior of the collection box. A filter screen is installed and connected at the opening of the central tube. A strip brush is installed and connected to one end of the long rod. One end of the long rod is rotatably connected to the middle of the filter screen, and the strip brush abuts against the mesh surface of the filter screen.

[0011] Preferably, the lower end of the collection shell is provided with a multi-head interface shell, and four openings are symmetrically provided on the bottom shell wall of the collection shell. The connectors of the multi-head interface shell are respectively connected to the four openings, and the multi-head interface shell is connected to one end of the air inlet pipe through a connecting pipe.

[0012] Preferably, the collection shell is provided with an auxiliary cleaning mechanism, which includes a square fixing rod. Both ends of the square fixing rod are fixedly connected to the side wall of the collection shell. Both ends of the square fixing rod are slidably connected to a sliding sleeve. Brush bristles are installed on both sliding sleeves. Both ends of the square fixing rod are fitted with conductive springs. One end of each of the two conductive springs is connected to the two side walls of the collection shell, and the other end of each of the two conductive springs is connected to the two sliding sleeves. Both of the two conductive springs are provided with rubber protective sleeves.

[0013] Preferably, an intermittent triggering mechanism is provided between the horizontal axis and the inner wall of the housing. The intermittent triggering mechanism includes a connecting rod, which is fixedly connected to one end of the horizontal axis. A short plate is fixedly connected to the inner wall of the housing, and a right-angle rod is slidably connected to the short plate. One end of the horizontal axis is a reciprocating lead screw, one end of the right-angle rod is threaded to the horizontal axis, and a contact piece is installed and connected to the other end of the right-angle rod. A contact strip is installed and connected to the short plate.

[0014] Compared with related technologies, the multi-purpose adjustable teaching demonstration device provided by the present invention has the following beneficial effects:

[0015] 1. This invention provides a multi-purpose adjustable teaching display device. By starting the motor, the output end drives the drive shaft to rotate, which in turn drives the rack plate to rotate the gear. At the same time, the rotating shaft rotates, causing the base to rotate relative to the two arc-shaped limit seats. This causes the base to rotate the display board, which in turn rotates the display board. This allows the content on the writing board to be conveniently displayed from multiple angles, enabling students to clearly view the teaching content.

[0016] 2. This invention provides a multi-purpose adjustable teaching and display device. The second gear on the drive shaft drives the chain to drive the first gear on the horizontal shaft to rotate. The horizontal shaft drives the large gear to rotate, causing the small gear to rotate rapidly at the same time. The airflow generated by the fan blades at one end of the long rod rotating inside the main air shell can automatically allow the dust inside the collection shell to enter the collection box through the connecting pipe, thereby conveniently completing the collection of dust.

[0017] 3. This invention provides a multi-purpose adjustable teaching and display device. By rotating the connecting rod at one end of the horizontal shaft, the contact piece at one end of the right-angle rod is driven to move intermittently to abut against the contact strip, thereby intermittently energizing the two conductive springs. This causes the two sliding sleeves to drive the two brush bristles to slide simultaneously, which can conveniently sweep the dust at the bottom of the collection shell to the opening, thus ensuring a good cleaning effect on the dust inside the collection shell. Attached Figure Description

[0018] Figure 1 A schematic diagram of a preferred embodiment of a multi-purpose adjustable teaching and display device provided by the present invention;

[0019] Figure 2 for Figure 1 The diagram shows the structure of the automatic rotation mechanism.

[0020] Figure 3 for Figure 1 The diagram shows the structure at point A.

[0021] Figure 4 for Figure 1 The diagram shows the structure of the transmission mechanism.

[0022] Figure 5 for Figure 1 The diagram shown is a structural schematic of the automatic cleaning mechanism.

[0023] Figure 6 for Figure 1 The diagram shown is a structural schematic of the auxiliary cleaning mechanism.

[0024] Figure 7 for Figure 1 The diagram shows the structure of the intermittent triggering mechanism.

[0025] Numbered in the diagram: 1. Box body; 11. Arc-shaped limiting seat; 12. Internal plate; 121. Vertical plate; 2. Base; 21. Rotating shaft; 22. Embedded guide wheel; 3. Display board; 31. Graphic display component; 32. Writing board; 321. Collection shell; 322. Multi-head interface shell; 33. Display screen; 4. Collection box; 41. Main air shell; 42. Central pipe; 43. Air inlet pipe; 44. Air outlet pipe; 5. Automatic rotation mechanism; 51. Rotating gear; 52. Rack plate; 53. Motor; 54. Drive shaft; 55 6. Connecting block; 6. Transmission mechanism; 61. Horizontal shaft; 611. First gear; 612. Large gear; 62. Second gear; 63. Chain; 64. Long rod; 641. Small gear; 7. Automatic cleaning mechanism; 71. Fan blade; 72. Strip brush; 73. Filter plate; 8. Auxiliary cleaning mechanism; 81. Square fixing rod; 82. Sliding sleeve; 821. Brush bristles; 83. Conductive spring; 9. Intermittent triggering mechanism; 91. Connecting rod; 92. Short plate; 93. Right angle rod; 94. Contact piece; 95. Contact strip. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] Please refer to the following: Figures 1 to 7 A multi-purpose adjustable teaching display device includes: a box body 1, with arc-shaped limiting seats 11 at both ends of the box body 1, an internal plate 12 fixedly connected inside the box body 1, a base 2 at the upper end of the box body 1, a rotating shaft 21 fixedly connected in the middle of the base 2, the lower end of the rotating shaft 21 being rotatably connected to the internal plate 12, a display plate 3 fixedly connected on the base 2, a graphic display component 31 at one end of the display plate 3, a writing board 32 at the other end of the display plate 3, a display screen 33 installed and connected on the side wall of the display plate 3, a collection shell 321 at the lower end of the writing board 32, a collection box 4 at the bottom of the box body 1, a main air shell 41 at one end of the collection box 4, a central pipe 42 between the main air shell 41 and the collection box 4, an air inlet pipe 43 fixedly connected to the box wall of the collection box 4, and an air outlet pipe 44 on the shell wall of the main air shell 41.

[0028] In the specific implementation process, such as Figure 1 and Figure 2As shown, the box 1 is equipped with an automatic rotation mechanism 5. The automatic rotation mechanism 5 includes a rotating gear 51, which is fixedly connected to the rotating shaft 21. A boss is provided on the inner plate 12, and a rack plate 52 is slidably connected on the boss. The rack plate 52 meshes with the rotating gear 51. A motor 53 is installed and connected on the side wall of the box 1. A drive shaft 54 ​​is fixedly connected to the output end of the motor 53. The other end of the drive shaft 54 ​​is rotatably connected to the boss. A connecting block 55 is fixedly connected to one end of the rack plate 52. The drive shaft 54 ​​is a threaded rod, and the connecting block 55 is threadedly connected to the drive shaft 54.

[0029] It should be noted that: starting the motor 53 causes its output end to drive the drive shaft 54 ​​to rotate. The rotation of the drive shaft 54 ​​causes the connecting block 55 to move. The rack plate 52 drives the rotating gear 51 to rotate, which in turn causes the base 2 to rotate. The display board 3 on the base 2 rotates at the same time, causing the graphic display component 31 on the display board 3 and the writing board 32 to rotate, thus conveniently displaying the content on the writing board 32 from multiple angles.

[0030] refer to Figure 1 and Figure 3 As shown, each of the two arc-shaped limiting seats 11 is provided with a limiting groove. The base 2 is rotatably connected to the two arc-shaped limiting seats 11. The side wall of the base 2 is provided with multiple embedded guide wheels 22.

[0031] It should be noted that: the base 2 rotates relative to the two arc-shaped limit seats 11, causing the multiple embedded guide wheels 22 on the base 2 to rotate, and the base 2 rotates stably enough.

[0032] refer to Figure 1 and Figure 4 As shown, a vertical plate 121 is fixedly connected to one end of the built-in plate 12. A transmission mechanism 6 is provided between the drive shaft 54 ​​and the vertical plate 121. The transmission mechanism 6 includes a horizontal shaft 61. One end of the horizontal shaft 61 is rotatably connected to the vertical plate 121. A first gear 611 is fixedly connected to the horizontal shaft 61. A second gear 62 is fixedly connected to one end of the drive shaft 54. A chain 63 is provided between the first gear 611 and the second gear 62. A large gear 612 is fixedly connected to the horizontal shaft 61. A long rod 64 is rotatably connected to the lower end of the vertical plate 121. A small gear 641 is fixedly connected to the long rod 64. The large gear 612 and the small gear 641 mesh with each other.

[0033] It should be noted that the rotation of the drive shaft 54 ​​drives the second gear 62 to rotate, the drive chain 63 drives the first gear 611 at one end of the horizontal shaft 61 to rotate, the rotation of the horizontal shaft 61 drives the large gear 612 to rotate, and the small gear 641 meshing with it rotates rapidly at the same time, so that the speed of the large gear 612 can be adjusted.

[0034] refer to Figure 1 and Figure 5As shown, an automatic cleaning mechanism 7 is provided between the collection box 4 and the main air casing 41. The automatic cleaning mechanism 7 includes a suction fan blade 71, which is located inside the main air casing 41. The suction fan blade 71 is fixedly connected to a long rod 64. One end of the long rod 64 extends into the interior of the collection box 4, and one end of the middle tube 42 extends into the interior of the collection box 4. A filter screen plate 73 is installed and connected at the opening of the middle tube 42. A strip brush 72 is installed and connected at one end of the long rod 64. One end of the long rod 64 is rotatably connected to the middle of the filter screen plate 73, and the strip brush 72 abuts against the mesh surface of the filter screen plate 73.

[0035] It should be noted that: the small gear 641 drives the long rod 64 to rotate, causing the suction fan blade 71 at one end of the long rod 64 to rotate inside the main air shell 41. The resulting airflow causes the dust inside the collection shell 321 to enter the collection box 4 through the connecting pipe, thus conveniently collecting the dust.

[0036] The strip brush 72 at one end of the long rod 64 rotates accordingly, cleaning the filter screen plate 73 at the opening of the middle tube 42, effectively preventing the filter screen plate 73 from being clogged by dust.

[0037] refer to Figure 1 and Figure 6 As shown, the lower end of the collection shell 321 is provided with a multi-head interface shell 322. Four openings are symmetrically provided on the bottom shell wall of the collection shell 321. The connectors of the multi-head interface shell 322 are connected to the four openings respectively. The multi-head interface shell 322 is connected to one end of the air inlet pipe 43 through a connecting pipe.

[0038] It should be noted that the dust at the bottom of the collection shell 321 is swept to the opening and falls into the multi-head interface shell 322, and then transported to the collection box 4 through the connecting pipe.

[0039] refer to Figure 6 As shown, the collection shell 321 is equipped with an auxiliary cleaning mechanism 8. The auxiliary cleaning mechanism 8 includes a square fixing rod 81. Both ends of the square fixing rod 81 are fixedly connected to the side wall of the collection shell 321. Both ends of the square fixing rod 81 are slidably connected to a sliding sleeve 82. Brush bristles 821 are installed on both sliding sleeves 82. Both ends of the square fixing rod 81 are fitted with conductive springs 83. One end of the two conductive springs 83 is connected to the two side walls of the collection shell 321, and the other end of the two conductive springs 83 is connected to the two sliding sleeves 82, respectively. Both conductive springs 83 are provided with rubber protective sleeves.

[0040] It should be noted that the two conductive springs 83 intermittently undergo elastic deformation and contraction, and the two sliding sleeves 82 drive the two bristles 821 to slide simultaneously.

[0041] The two conductive springs 83 restore their elastic deformation, causing the two sliding sleeves 82 to slide in opposite directions relative to the two ends of the square fixed rod 81. The two sliding sleeves 82 cause the two brush bristles 821 to slide in opposite directions, thus enabling the two brush bristles 821 to sweep the dust at the bottom of the collection shell 321 to the opening and fall into the multi-head interface shell 322, ensuring a good cleaning effect on the dust inside the collection shell 321.

[0042] refer to Figure 1 and Figure 7 As shown, an intermittent triggering mechanism 9 is provided between the horizontal shaft 61 and the inner wall of the housing 1. The intermittent triggering mechanism 9 includes a connecting rod 91, which is fixedly connected to one end of the horizontal shaft 61. A short plate 92 is fixedly connected to the inner wall of the housing 1. A right-angle rod 93 is slidably connected to the short plate 92. One end of the horizontal shaft 61 is a reciprocating lead screw. One end of the right-angle rod 93 is threadedly connected to the horizontal shaft 61. A contact piece 94 is installed and connected to the other end of the right-angle rod 93. A contact strip 95 is installed and connected to the short plate 92.

[0043] It should be noted that: while the horizontal axis 61 rotates, it drives the connecting rod 91 to rotate, which in turn drives the right-angle rod 93 to slide back and forth relative to the short plate 92. The movement of the right-angle rod 93 causes the contact piece 94 at one end to move intermittently to abut against the contact strip 95, thereby intermittently forming a complete electrical circuit, causing the two conductive springs 83 to intermittently undergo elastic deformation and contraction.

[0044] When the contact piece 94 moves to abut against the contact strip 95, an electrical path is formed between the contact piece 94, the contact strip 95, the two conductive springs 83, and the external power supply.

[0045] The working principle of the multi-purpose adjustable teaching display device provided by the present invention is as follows: When it is necessary to adjust the display board 3, the motor 53 is started, and its output end drives the drive shaft 54 ​​to rotate. The rotation of the drive shaft 54 ​​drives the connecting block 55 to move. The connecting block 55 drives the rack plate 52 to slide relative to the protrusion on the built-in plate 12. The rack plate 52 drives the rotating gear 51 to rotate, so that the rotating gear 51 drives the rotating shaft 21 at the lower end of the base 2 to rotate at the same time, so that the base 2 rotates relative to the two arc-shaped limit seats 11, so that the multiple embedded guide wheels 22 on the base 2 rotate. The base 2 drives the display board 3 to rotate at the same time, so that the graphic display component 31 on the display board 3 and the writing board 32 rotate, so that the content on the writing board 32 can be conveniently displayed from multiple angles.

[0046] When chalk is used to record teaching points on the writing board 32 or to wipe the content on the writing board 32, chalk dust automatically falls into the collection shell 321 at the lower end of the writing board 32. The rotation of the drive shaft 54 ​​drives the second gear 62 to rotate, and the drive chain 63 drives the first gear 611 at one end of the horizontal shaft 61 to rotate accordingly. The rotation of the horizontal shaft 61 drives the large gear 612 to rotate, causing the small gear 641 meshing with it to rotate rapidly at the same time. The small gear 641 drives the long rod 64 to rotate, causing the suction fan blade 71 at one end of the long rod 64 to rotate inside the main air shell 41. The airflow generated causes the dust inside the collection shell 321 to enter the collection box 4 through the connecting pipe. The strip brush 72 at one end of the long rod 64 rotates accordingly, cleaning the filter plate 73 at the opening of the middle pipe 42, effectively preventing the filter plate 73 from being blocked by dust.

[0047] As the horizontal axis 61 rotates, it drives the connecting rod 91 to rotate, causing the right-angle rod 93 to slide back and forth relative to the short plate 92. The movement of the right-angle rod 93 causes the contact piece 94 at one end to move intermittently until it abuts against the contact strip 95, thus intermittently forming a complete electrical circuit. This causes the two conductive springs 83 to intermittently undergo elastic deformation and contraction. When the contact piece 94 moves to abut against the contact strip 95, the two conductive springs 83 contract, causing the two sliding sleeves 82 to slide relative to the two ends of the square fixed rod 81. The two sliding sleeves 82 drive the two Simultaneously, the bristles 821 slide. When the contact piece 94 moves to separate from the contact strip 95, the two conductive springs 83 restore their elastic deformation, causing the two sliding sleeves 82 to slide in opposite directions relative to the two ends of the square fixed rod 81. The two sliding sleeves 82 drive the two bristles 821 to slide in opposite directions, thus enabling the two bristles 821 to sweep the dust at the bottom of the collection shell 321 to the opening and fall into the multi-head interface shell 322. After that, it is transported to the collection box 4 through the connecting pipe, ensuring a good cleaning effect on the dust in the collection shell 321.

[0048] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A multi-purpose adjustable teaching and display device, characterized in that, include: The box (1) has arc-shaped limiting seats (11) at both ends. An internal plate (12) is fixedly connected inside the box (1). A base (2) is provided at the upper end of the box (1). A rotating shaft (21) is fixedly connected to the middle of the base (2). The lower end of the rotating shaft (21) is rotatably connected to the internal plate (12). A display board (3) is fixedly connected to the base (2). A graphic display component (31) is provided at one end of the display board (3). A writing board (32) is provided at the other end of the display board (3). A display screen (33) is installed on the side wall of the display board (3). A collection shell (321) is provided at the lower end of the writing board (32). A collection box (4) is provided at the bottom of the box (1). One end of the collection box (4) is provided with a main air shell (41), and a middle pipe (42) is provided between the main air shell (41) and the collection box (4). An air inlet pipe (43) is fixedly connected to the box wall of the collection box (4). An air outlet pipe (44) is provided on the shell wall of the main air shell (41). A multi-head interface shell (322) is provided at the lower end of the collection shell (321). Four openings are symmetrically provided on the bottom shell wall of the collection shell (321). The connectors of the multi-head interface shell (322) are connected to the four openings respectively. The multi-head interface shell (322) is connected to one end of the air inlet pipe (43) through a connecting pipe. An auxiliary cleaning mechanism (8) is provided inside the collection shell (321). The auxiliary cleaning mechanism (8) includes a square fixing rod (81). Both ends of the square fixing rod (81) are fixedly connected to the side wall of the collecting shell (321). Both ends of the square fixing rod (81) are slidably connected to the sliding sleeves (82). Brush bristles (821) are installed on both sliding sleeves (82). Both ends of the square fixing rod (81) are fitted with conductive springs (83). One end of each of the two conductive springs (83) is connected to the two side walls of the collecting shell (321), and the other end of each of the two conductive springs (83) is connected to the two sliding sleeves (82). Both of the two conductive springs (83) are provided with rubber protective sleeves. A motor (53) is installed on the side wall of the box (1). The output end of the motor (53) is fixedly connected to a drive shaft (54). A vertical plate (121) is fixedly connected to one end of the built-in plate (12). A transmission mechanism (6) is provided between the drive shaft (54) and the vertical plate (121). The transmission mechanism (6) includes a horizontal shaft (61). One end of the horizontal shaft (61) is rotatably connected to the vertical plate (121). A first gear (611) is fixedly connected to the horizontal shaft (61). A second gear (62) is fixedly connected to one end of the drive shaft (54). A chain (63) is provided between the first gear (611) and the second gear (62). An intermittent triggering mechanism (9) is provided between the horizontal shaft (61) and the inner wall of the housing (1). The intermittent triggering mechanism (9) includes a connecting rod (91). One end of the connecting rod (91) is fixedly connected to the horizontal shaft (61).A short plate (92) is fixedly connected to the inner wall of the housing (1). A right-angle rod (93) is slidably connected to the short plate (92). One end of the horizontal shaft (61) is a reciprocating lead screw. One end of the right-angle rod (93) is threadedly connected to the horizontal shaft (61). A contact piece (94) is installed and connected to the other end of the right-angle rod (93). A contact strip (95) is installed and connected to the short plate (92). The movement of the right-angle rod (93) causes the contact piece (94) at one end to move intermittently to abut against the contact strip (95), thus intermittently forming a complete electrical circuit, causing the two conductive springs (83) to intermittently undergo elastic deformation and contraction.

2. The multi-purpose adjustable teaching demonstration device according to claim 1, characterized in that, The housing (1) is equipped with an automatic rotation mechanism (5). The automatic rotation mechanism (5) includes a rotating gear (51) which is fixedly connected to a rotating shaft (21). The inner plate (12) is provided with a boss, and a rack plate (52) is slidably connected to the boss. The rack plate (52) meshes with the rotating gear (51). The other end of the drive shaft (54) is rotatably connected to the boss. One end of the rack plate (52) is fixedly connected to a connecting block (55). The drive shaft (54) is a threaded rod, and the connecting block (55) is threadedly connected to the drive shaft (54).

3. The multi-purpose adjustable teaching demonstration device according to claim 1, characterized in that, Both of the arc-shaped limiting seats (11) are provided with limiting grooves. The base (2) is rotatably connected to the two arc-shaped limiting seats (11). Multiple embedded guide wheels (22) are provided on the side wall of the base (2).

4. The multi-purpose adjustable teaching demonstration device according to claim 2, characterized in that, A large gear (612) is fixedly connected to the horizontal shaft (61), and a long rod (64) is rotatably connected to the lower end of the vertical plate (121). A small gear (641) is fixedly connected to the long rod (64), and the large gear (612) meshes with the small gear (641).

5. The multi-purpose adjustable teaching demonstration device according to claim 4, characterized in that, An automatic cleaning mechanism (7) is provided between the collection box (4) and the main air casing (41). The automatic cleaning mechanism (7) includes a suction fan blade (71), which is located inside the main air casing (41). The suction fan blade (71) is fixedly connected to a long rod (64). One end of the long rod (64) extends into the interior of the collection box (4), and one end of the middle tube (42) extends into the interior of the collection box (4). A filter plate (73) is installed and connected at the opening of the middle tube (42). A strip brush (72) is installed and connected at one end of the long rod (64). One end of the long rod (64) is rotatably connected to the middle of the filter plate (73), and the strip brush (72) abuts against the mesh surface of the filter plate (73).

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