A teaching demonstration system

Abstract

This application relates to a teaching demonstration system, belonging to the technical field of teaching demonstration equipment. The system includes a document camera stand with a detachable mounting plate for placing teaching objects. It also includes a sliding rod slidably mounted on the classroom ceiling and a first driving component mounted on the ceiling. The sliding rod is located above the mounting plate and slides towards or away from the back row of the classroom. A connecting rod is slidably mounted on the sliding rod, with its sliding direction vertical. A second driving component is mounted on the sliding rod to drive the connecting rod towards or away from the mounting plate. A connecting component is mounted on the connecting rod to relatively fix the mounting plate and the connecting rod. This application has the advantage of facilitating observation of teaching objects by students in the back and sides, thus ensuring effective teaching.

Description

Technical Field

[0001] This application relates to the field of teaching demonstration equipment technology, and in particular to a teaching demonstration system. Background Technology

[0002] With the development of technology, teaching methods that organically combine instruction and demonstration have been widely praised by teachers and students. Using physical teaching objects, visual aids, and modern audiovisual aids can engage students' multiple senses in learning, thereby improving the quality of teaching.

[0003] A teaching demonstration system typically includes an interactive whiteboard, a document camera, and a computer. The document camera is located in front of the interactive whiteboard, and the computer is placed on the document camera; the computer and the interactive whiteboard are electrically connected. In use, the interactive whiteboard is controlled by operating the computer, or teaching objects are placed on the document camera for display.

[0004] Regarding the aforementioned technologies, when the physical objects to be displayed are small, students in the back row and on the sides may not be able to observe them clearly, which affects the teaching effect. Summary of the Invention

[0005] To help students in the back and sides observe teaching objects and ensure teaching effectiveness, this application provides a teaching demonstration system.

[0006] The teaching demonstration system provided in this application adopts the following technical solution: A teaching demonstration system includes a document camera stand with a detachable mounting plate for placing teaching objects. The system also includes a sliding rod slidably mounted on the classroom ceiling and a first driving component mounted on the ceiling. The sliding rod is located above the mounting plate and slides towards or away from the back row of the classroom. A connecting rod is slidably mounted on the sliding rod, with its sliding direction vertical. A second driving component is mounted on the sliding rod to drive the connecting rod towards or away from the mounting plate. A connecting component is mounted on the connecting rod to fix the mounting plate and the connecting rod relatively.

[0007] By adopting the above technical solution, the physical object to be displayed is placed on the fixed plate. The first driving component drives the sliding rod to move the connecting rod to directly above the fixed plate. The second driving component drives the connecting rod to move towards the fixed plate. The connecting rod and the fixed plate are fixed relative to each other by the connecting component. Then, the second driving component drives the connecting rod to move the fixed plate up to a certain height. Then, the first driving component drives the sliding rod to move the connecting rod and the teaching object on the fixed plate towards the back row of the classroom. This makes the object closer to the students in the back row and on the side, which helps students see it more clearly and ensures the teaching effect to a certain extent.

[0008] Preferably, the fixed plate is rotatably provided with a placement plate for placing teaching objects, the rotation axis of the placement plate is parallel to the sliding direction of the connecting rod, and the sliding rod is provided with a transmission component for driving the placement plate to rotate when the sliding rod slides.

[0009] By adopting the above technical solution, the teaching objects to be displayed are placed on the display board. When the sliding rod slides, it drives the display board to rotate through the transmission component, which makes it easier for students on the side to view the objects. At the same time, it helps students to view the objects from various angles, further facilitating their viewing and understanding of the objects and ensuring the teaching effect.

[0010] Preferably, the placement plate is provided with a rotating shaft, which is rotatably mounted on the fixed plate. The transmission assembly includes a first gear sleeved on the rotating shaft, a second gear rotatably mounted on the fixed plate, and a transmission component mounted on the sliding rod. The first gear and the second gear mesh, and the transmission component is used to drive the second gear to rotate when the sliding rod slides.

[0011] By adopting the above technical solution, when the sliding rod slides, it drives the second gear to rotate through the transmission component, and the second gear drives the first gear to rotate, thereby realizing that the placement board drives the teaching object to rotate, which further facilitates the viewing of students on the side. At the same time, it helps students to view the teaching object from various angles, which helps students to view and understand the object and improves the teaching effect.

[0012] Preferably, the transmission component includes a first transmission rod coaxially connected to the second gear, a second transmission rod rotatably mounted on a connecting rod, a third transmission rod rotatably mounted on a sliding rod, a third gear sleeved on the end of the third transmission rod away from the fixed plate, and a first rack for mounting on the ceiling. The rotation axes of the second and third transmission rods are parallel to the rotation axis of the second gear. The second transmission rod is slidably sleeved inside the third transmission rod, and the sliding direction of the second transmission rod is parallel to the sliding direction of the connecting rod. A locking block is provided at the end of the second transmission rod near the placement plate. The cross-section of the locking block is polygonal. A slot is provided on the first transmission rod for engaging with the locking block. The length direction of the first rack is parallel to the sliding direction of the sliding rod. The third gear and the first rack mesh.

[0013] By adopting the above technical solution, when the connecting rod slides towards the fixed plate, it drives the second transmission rod to move downward, causing the second and third transmission rods to slide relative to each other. The locking block on the second transmission rod engages with the locking groove on the first transmission rod. Then, after the connecting rod is fixed relative to the fixed plate, it drives the fixed plate to move upward, keeping the locking block engaged with the locking groove. When the sliding rod drives the connecting rod to move, it causes the third gear to roll along the first rack, thereby driving the third and second transmission rods to rotate. Since the cross-section of the locking block is polygonal, the rotation of the second transmission rod can drive the placement plate to rotate through the transmission of the second and first gears, further facilitating the viewing of students on the side. At the same time, it helps students to view the object from various angles, which helps students to view and understand the object.

[0014] Preferably, a mounting plate is slidably mounted on the physical display stand, the sliding direction of the mounting plate is set in the vertical direction, the fixing plate and the mounting plate are detachably connected, and the physical display stand is provided with a sliding component for driving the mounting plate to slide.

[0015] By adopting the above technical solution, the teaching objects are placed on the placement board, and the sliding component drives the mounting board to move upward, which in turn moves the fixing board, the placement board, and the teaching objects on the placement board upward. For larger teaching objects, the height of the objects can be increased to facilitate viewing by students in the back row and on the sides, reducing the possibility of students in the front row blocking the view of students in the back row. This helps to select the display method of the teaching objects according to the actual situation.

[0016] Preferably, an iron sheet is embedded on the side of the mounting plate near the fixing plate, and a magnet is embedded in the bottom wall of the fixing plate. The magnet and the iron sheet are positioned correspondingly and are attracted to each other.

[0017] By adopting the above technical solution, using the combination of magnets and iron sheets, the fixing plate and the mounting plate can be disassembled and assembled, making it less likely for the fixing plate to slide on the mounting plate. At the same time, the position of the fixing plate is positioned, which helps the connecting rod to smoothly drive the fixing plate to move.

[0018] Preferably, the connector includes a connecting plate disposed on the side of the connecting rod near the fixing plate, a screw threaded to the fixing plate, and an abutment block fixedly connected to the side of the screw near the connecting rod. The rotation axis of the screw is parallel to the sliding direction of the connecting rod. The connecting plate has a connecting hole for the abutment block and the screw to pass through. The abutment block is used to abut against the side of the connecting plate away from the fixing plate.

[0019] By adopting the above technical solution, the abutment block is rotated to align with the connecting hole. When the connecting rod slides towards the direction closer to the fixed plate, the connecting hole on the connecting plate passes through the abutment block and the screw. Then, the abutment block is rotated to span the connecting hole and abut against the side of the connecting plate away from the fixed plate, thus achieving relative fixation between the connecting rod and the fixed plate. Rotating the abutment block to align with the connecting hole, the connecting rod drives the connecting plate to slide away from the fixed plate, causing the connecting hole to disengage from the screw and the abutment block, thereby achieving disassembly between the connecting rod and the fixed plate. This method is simple, convenient, and easy to operate.

[0020] Preferably, the placement plate is provided with a suction cup for adsorbing teaching objects. The suction cup is connected to an air extraction tube. A piston is slidably disposed inside the air extraction tube. The piston slides toward or away from the suction cup. A threaded sleeve is provided at the end of the piston away from the suction cup. The threaded sleeve slides inside the air extraction tube. The sliding direction of the threaded sleeve is parallel to the sliding direction of the piston. A lead screw is rotatably passed through the end of the air extraction tube away from the suction cup. The lead screw is threadedly connected inside the threaded sleeve.

[0021] By adopting the above technical solution, the teaching object is placed on the placement plate and aligned with the suction cup. The screw is rotated so that the screw drives the threaded sleeve and piston to slide away from the suction cup, thereby achieving the suction cup to adsorb and fix the teaching object. This makes it less likely for the teaching object on the placement plate to tip over or fall off during the process of the connecting rod moving the fixing plate.

[0022] Preferably, the rotation axis of the lead screw is perpendicular to the rotation axis of the placement plate. A fourth gear is sleeved on the end of the lead screw outside the suction pipe. A second rack is provided on the second transmission rod for meshing with the fourth gear. The distance from the bottom of the fourth gear to the second gear is greater than the length of the second rack. The distance from the end of the lead screw away from the suction cup to the center of the placement plate is less than the horizontal distance from the second transmission rod to the center of the placement plate. When the locking block on the second transmission rod engages with the locking slot, the second rack is located below the fourth gear.

[0023] By adopting the above technical solution, as the connecting rod drives the second transmission rod to slide towards the fixed plate, the second rack on the second transmission rod drives the fourth gear to rotate. The fourth gear drives the lead screw to rotate, causing the lead screw to drive the threaded sleeve and piston to slide away from the suction cup. Since the air inside the suction cup is constant, the suction cup adheres and fixes the teaching object, making it difficult for the teaching object to tip over and fall off the placement plate. Then, the connecting rod continues to drive the second transmission rod and rack to move downward, causing the rack and fourth gear to disengage. This makes it less likely for the rack and fourth gear to interfere when the placement plate and the fixed plate rotate relative to each other. When the connecting rod drives the second transmission rod to slide away from the fixed plate, the rack and fourth gear on the second transmission rod mesh, causing the lead screw to reverse. This helps the lead screw drive the piston block to slide towards the suction cup, making it easier to remove the teaching object from the placement plate.

[0024] In summary, this application includes at least one of the following beneficial technical effects: The physical object to be displayed is placed on the fixed plate. The first driving component drives the sliding rod to move the connecting rod to directly above the fixed plate. The second driving component drives the connecting rod to move closer to the fixed plate. The connecting rod and the fixed plate are fixed relative to each other by the connecting component. Then, the second driving component drives the connecting rod to move the fixed plate up to a certain height. Then, the first driving component drives the sliding rod to move the connecting rod and the teaching object on the fixed plate towards the back row of the classroom. This makes the object closer to the students in the back row and on the side, which helps students see it more clearly and ensures the teaching effect to a certain extent. When the connecting rod slides towards the fixed plate, it drives the second transmission rod to move downward, causing the second and third transmission rods to slide relative to each other. The locking block on the second transmission rod engages with the locking groove on the first transmission rod. Then, after the connecting rod is fixed relative to the fixed plate, it drives the fixed plate to move upward, keeping the locking block engaged with the locking groove. When the sliding rod drives the connecting rod to move, it causes the third gear to roll along the first rack, thereby driving the third and second transmission rods to rotate. Since the cross-section of the locking block is polygonal, the rotation of the second transmission rod can drive the placement plate to rotate through the transmission of the second and first gears, further facilitating the viewing of students from the side. It also helps students to view the object from various angles, which helps them to observe and understand the object. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0026] Figure 2 This is a partial structural cross-sectional view of an embodiment of the application.

[0027] Figure 3 yes Figure 2Enlarged view of part A in the middle.

[0028] Figure 4 This is a partial structural cross-sectional view of an embodiment of the application.

[0029] Figure 5 yes Figure 4 Enlarged view of section B.

[0030] Explanation of reference numerals in the attached drawings: 1. Physical display stand; 2. Fixing plate; 3. Sliding rod; 4. Connecting rod; 41. First rod body; 42. Second rod body; 5. Connecting component; 51. Connecting plate; 52. Screw; 53. Abutment block; 6. Placement plate; 7. Transmission assembly; 71. First gear; 72. Second gear; 73. Transmission component; 731. First transmission rod; 732. Second transmission rod; 733. Third transmission rod; 734. Third gear; 735. First rack; 8. Rotating shaft; 9. Locking block; 10. Locking slot; 11. Mounting plate ; 12. Iron sheet; 13. Magnet; 14. Connecting hole; 15. Suction cup; 16. Suction pipe; 161. First tube body; 162. Second tube body; 17. Piston; 18. Threaded sleeve; 19. Lead screw; 20. Fourth gear; 21. Second rack; 22. Opening; 23. First rodless cylinder; 24. Second rodless cylinder; 25. Cover plate; 26. Third rodless cylinder; 27. Controller; 28. First fixing block; 29. ​​Second fixing block; 30. Slider; 31. Slide groove; 32. Guide block; 33. Guide groove. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0032] This application discloses a teaching demonstration system. (Refer to...) Figure 1 and Figure 2 The teaching demonstration system includes a document camera 1, a sliding rod 3 for sliding on the classroom ceiling, and a first drive unit for being mounted on the classroom ceiling. The document camera 1 is located in the center in front of the interactive flat panel.

[0033] Reference Figure 2 and Figure 3The top wall of the physical display stand 1 has an opening 22, and a mounting plate 11 is slidably mounted inside the opening 22. The sliding direction of the mounting plate 11 is vertical. A slider 30 is fixed to one side of the mounting plate 11. A groove 31 is provided on the inner wall of the opening 22 to slide with the slider 30. A sliding component for driving the mounting plate 11 to slide is provided inside the opening 22. A fixing plate 2 is detachably mounted on the top wall of the mounting plate 11. An iron sheet 12 is embedded on the side of the mounting plate 11 near the fixing plate 2. A magnet 13 is embedded on the side of the fixing plate 2 near the mounting plate 11. Corresponding to the position of the iron sheet 12, the magnet 13 and the iron sheet 12 are attracted and engaged; the side of the fixing plate 2 away from the mounting plate 11 is rotatably provided with a placement plate 6 for placing teaching objects. The cross-section of the placement plate 6 is circular, and the rotation axis of the placement plate 6 is set in the vertical direction. The bottom wall of the placement plate 6 is coaxially fixed with a rotating shaft 8, which is rotatably set on the top wall of the fixing plate 2. In other embodiments, the magnet 13 and the iron sheet 12 can be replaced with bolts. Using bolts to fix the mounting plate 11 and the fixing plate 2 relative to each other can also realize the assembly and disassembly between the mounting plate 11 and the fixing plate 2.

[0034] Reference Figure 2 and Figure 3 The sliding rod 3 is located above the fixed plate 2. The sliding rod 3 slides towards or away from the back row of the classroom. The sliding direction of the sliding rod 3 is parallel to the length direction of the classroom, that is, from the front row to the back row. In this embodiment, the first driving component includes a first rodless cylinder 23 for fixed installation on the classroom ceiling. The length direction of the first rodless cylinder 23 is parallel to the sliding direction of the sliding rod 3. The top end of the sliding rod 3 is fixedly connected to the moving part of the first rodless cylinder 23. In other embodiments, the first rodless cylinder 23 can be replaced by a lead screw rotatably installed on the ceiling and a motor fixedly installed on the ceiling. The output shaft of the lead screw and the motor are coaxially fixed. The sliding rod 3 is threadedly connected to the lead screw. The sliding rod 3 can also be slidable by using a motor to drive the lead screw to rotate.

[0035] Reference Figure 2 and Figure 3A connecting rod 4 is slidably mounted on the sliding rod 3. The connecting rod 4 includes a first rod body 41 slidably mounted on the sliding rod 3 and two second rod bodies 42 fixed to the bottom wall of the first rod body 41. The longitudinal section of the second rod body 42 is inverted L-shaped. The sliding direction of the first rod body 41 is set in the vertical direction. A second driving member is provided on the sliding rod 3 to drive the first rod body 41 to slide towards or away from the fixed plate 2. In this embodiment, the second driving member includes a second rodless cylinder 24 fixedly mounted on the sliding rod 3. The length direction of the second rodless cylinder 24 is parallel to the sliding direction of the first rod body 41. The rod 41 is fixedly connected to the moving part of the second rodless cylinder 24; in other embodiments, the second rodless cylinder 24 can be replaced by a multi-stage telescopic cylinder, etc.; the end of the second rod 42 near the fixed plate 2 is provided with a connecting piece 5 for fixing the fixed plate 2 and the connecting rod 4 relatively. The top wall of the document camera 1 is hinged with a cover plate 25 for opening and closing the opening 22. The rotation axis of the cover plate 25 is parallel to the sliding direction of the sliding rod 3. The cover plate 25 helps to protect the mounting plate 11 and the fixed plate 2 when not in use, and at the same time helps to keep the upper surface of the document camera 1 flat, making it convenient for teachers to place textbooks, etc. when not in use.

[0036] Reference Figure 2 and Figure 3 The sliding component includes a third rodless cylinder 26 fixedly installed on the inner wall of the opening 22. The length direction of the third rodless cylinder 26 is parallel to the sliding direction of the mounting plate 11, and the mounting plate 11 and the moving part of the third rodless cylinder 26 are fixedly connected. A controller 27 is fixedly installed on the physical display stand 1, and the first rodless cylinder 23, the second rodless cylinder 24 and the third rodless cylinder 26 are all connected to the controller 27.

[0037] Reference Figure 2 and Figure 3 The connector 5 includes a connecting plate 51 fixedly connected to the side of the second rod 42 near the fixing plate 2, a screw 52 threadedly connected to the fixing plate 2, and an abutment block 53 fixedly connected to the side of the screw 52 near the second rod 42. The screw 52 corresponds one-to-one with the connecting plate 51. The rotation axis of the screw 52 is parallel to the sliding direction of the first rod 41. The cross-section of the abutment block 53 is rectangular. The connecting plate 51 has a connecting hole 14 for the abutment block 53 and the screw 52 to pass through. The screw 52 corresponds to the position of the corresponding connecting hole 14. The length of the abutment block 53 is greater than the width of the connecting hole 14. The abutment block 53 is used to abut against the side of the connecting plate 51 away from the fixing plate 2.

[0038] When the object to be displayed is large, rotate the cover plate 25 away from the opening 22 to open the opening 22. Then, activate the third rodless cylinder 26 via the controller 27. The third rodless cylinder 26 drives the mounting plate 11, which in turn moves the fixing plate 2 and the placement plate 6 upwards to the desired height. Then, place the teaching object on the placement plate 6. The teacher can rotate the placement plate 6 to show students different positions of the teaching object, thus preventing students in the front row from blocking the view of students in the back and sides, and helping students in the back and sides to observe more clearly, ensuring the teaching effect. After the display is finished, remove the teaching object from the placement plate 6. Then, activate the third rodless cylinder 26 via the controller 27 to move the mounting plate 11, the fixing plate 2, and the placement plate 6 into the opening 22. Then, rotate the cover plate 25 towards the opening 22 to close the opening 22, keeping the surface of the display stand 1 flat and preventing it from obstructing students' view of the interactive tablet. It also makes it easier for the teacher to place textbooks and other items.

[0039] When the object to be displayed is small, after rotating the cover plate 25 to open the opening 22, place the teaching object on the placement plate 6. Operate the controller 27 to activate the first rodless cylinder 23. The first rodless cylinder 23 drives the sliding rod 3 to move the first rod body 41 above the placement plate 6, so that the connecting hole 14 on the second rod body 42 is aligned with the screw 52. Rotate the abutment block 53 to align the abutment block 53 with the connecting hole 14. Then operate the controller 27 to activate the second rodless cylinder 24. The second rodless cylinder 24 drives the first rod body 41 to slide the second rod body 42 towards the direction closer to the fixed plate 2, so that the connecting hole 14 on the connecting plate 51 passes through the corresponding abutment block 53 and screw 52. The side of the connecting plate 51 closest to the fixed plate 2 abuts against the fixed plate 2. Rotate the abutment block 53 to make the abutment block 53 span the connecting plate 2. Hole 14, the abutting block 53 abuts against the side of the fixed plate 2 and the connecting plate 51 away from the fixed plate 2, thereby achieving relative fixation between the second rod 42 and the fixed plate 2; then the controller 27 is operated to start the second rodless cylinder 24, the second rodless cylinder 24 drives the first rod 41 to move the second rod 42 and the fixed plate 2 upward, so that the magnet 13 and the iron sheet 12 are separated, raising the teaching object on the placement plate 6 to a certain height, usually higher than the students' heads when they are sitting. Then the controller 27 is operated to start the first rodless cylinder 23, the first rodless cylinder 23 drives the sliding rod 3 to move the first rod 41 and the teaching object towards the direction closer to the back row, so that the teaching object is closer to the students in the back row and on the side, which helps the students to see more clearly and to a certain extent ensures the teaching effect.

[0040] Reference Figure 2 and Figure 3The sliding rod 3 is provided with a transmission assembly 7 for driving the placement plate 6 to rotate when the sliding rod 3 slides. The transmission assembly 7 includes a first gear 71 fixedly sleeved on the rotating shaft 8, a second gear 72 rotatably mounted on the fixed plate 2, and a transmission component 73 mounted on the sliding rod 3. The rotation axis of the second gear 72 is parallel to the sliding direction of the first rod body 41. The first gear 71 and the second gear 72 mesh. The second gear 72 is located between the two screws 52. The transmission component 73 is used to drive the second gear 72 to rotate when the sliding rod 3 slides.

[0041] Reference Figure 2 and Figure 3 To facilitate the rotation of the second gear 72, a first fixing block 28 is fixedly connected to the sliding rod 3, and a second fixing block 29 is fixedly connected to the first rod body 41. The transmission component 73 includes a first transmission rod 731 coaxially passing through the second gear 72, a second transmission rod 732 rotatably passing through the second fixing block 29, a third transmission rod 733 rotatably passing through the first fixing block 28, a third gear 734 fixedly sleeved on the third transmission rod 733, and a first rack 735 for mounting on the ceiling. The rotation axes of the second transmission rod 732 and the third transmission rod 733 are parallel to the rotation axis of the second gear 72. The second transmission rod 732 is located between the two second rod bodies 42, and the second transmission rod 732 is slidably sleeved within the third transmission rod 733. The sliding direction is parallel to the sliding direction of the connecting rod 4. A protrusion (not shown in the figure) is fixedly connected to the outer wall of the second transmission rod 732. A groove (not shown in the figure) is opened on the inner wall of the third transmission rod 733 to slide and engage with the protrusion. A locking block 9 is coaxially fixedly connected to one end of the second transmission rod 732 near the placement plate 6. The cross-section of the locking block 9 is polygonal. In this embodiment, the cross-section of the locking block 9 is rectangular. A slot 10 is coaxially opened on one end of the first transmission rod 731 near the second rod body 42 to engage with the locking block 9. The length direction of the first rack 735 is parallel to the sliding direction of the sliding rod 3. The third gear 734 meshes with the first rack 735. When the connecting hole 14 on the connecting plate 51 passes through the abutment block 53 and the screw 52, ​​the locking block 9 and the slot 10 engage.

[0042] When the first rod 41 drives the second rod 42 to slide towards the fixed plate 2, the first rod 41 drives the second transmission rod 732 to move towards the first transmission rod 731. When the connecting hole 14 on the connecting plate 51 passes through the corresponding abutment block 53 and screw 52, ​​the locking block 9 on the second transmission rod 732 moves into the locking groove 10 on the first transmission rod 731, so that the locking block 9 and the locking groove 10 are engaged. Then, the abutment block 53 is rotated to fix the second rod 42 relative to the fixed plate 2, so that the locking block 9 and the locking groove 10 remain engaged. Then, the controller 27 is operated to start the second rodless cylinder 24. The second rodless cylinder 24 drives the first rod 41 to move the fixed plate 2 and the teaching objects on the placement plate 6 to the required height, so that the second transmission rod 732 slides towards the third transmission rod 733. Then, the controller 27 is operated to start the first rodless cylinder 24. The rod cylinder 23 and the first rodless cylinder 23 drive the sliding rod 3 to slide the teaching object towards the back row of the classroom. Since the third gear 734 meshes with the first rack 735, the third gear 734 rolls along the first rack 735 when the sliding rod 3 moves, thereby driving the third transmission rod 733 to rotate. The third transmission rod 733 drives the second transmission rod 732 to rotate. Since the cross-section of the locking block 9 is rectangular, the second transmission rod 732 drives the first transmission rod 731 and the second gear 72 to rotate, realizing the rotation of the first gear 71 and the placement plate 6. This allows the placement plate 6 to drive the teaching object to rotate during the process of the teaching object moving from the front row to the back row and from the back row to the front row of the classroom. This further facilitates the viewing of students on the side and helps students to see different positions of the object, which helps students to view and understand the object and, to a certain extent, ensures the teaching effect.

[0043] Reference Figure 4 and Figure 5A suction cup 15 is embedded in the placement plate 6, located at the center of the placement plate 6. An air extraction pipe 16 is connected to the suction cup 15. The air extraction pipe 16 includes a first pipe body 161 connected to the suction cup 15 and a second pipe body 162 connected to the end of the first pipe body 161 away from the suction cup 15. The length direction of the first pipe body 161 is vertical, and the length direction of the second pipe body 162 is perpendicular to the length of the first pipe body 161 and perpendicular to the rotation axis of the placement plate 6. A piston 17 is slidably disposed within the second pipe body 162, sliding towards or away from the suction cup 15. A threaded sleeve 18 is fixedly connected to the end of the piston 17 away from the suction cup 15. The threaded sleeve 18 is slidably disposed within the second pipe body 162, and its sliding direction is parallel to the length direction of the second pipe body 162. A guide block 32 is fixed to the end of the threaded sleeve 18 away from the piston 17. A slidable engagement is formed on the inner wall of the second pipe body 162 with the guide block 32. The guide groove 33, the end of the suction pipe 16 away from the suction cup 15 is closed, and a lead screw 19 is rotatably inserted through the end of the suction pipe 16 away from the suction cup 15. The lead screw 19 rotatably extends out of the placement plate 6 and is threaded into the threaded sleeve 18. The rotation axis of the lead screw 19 is perpendicular to the rotation axis of the placement plate 6. The end of the lead screw 19 outside the placement plate 6 is fixedly fitted with a fourth gear 20. The distance from the end of the lead screw 19 away from the suction cup 15 to the center of the placement plate 6 is less than that of the second transmission rod. The horizontal distance from 732 to the center of the placement plate 6 is such that a second rack 21 for meshing with the fourth gear 20 is fixedly connected to the second transmission rod 732. The distance from the bottom end of the fourth gear 20 to the second gear 72 is greater than the length of the second rack 21. The distance from the bottom wall of the locking block 9 to the top wall of the second rack 21 is less than the distance from the bottom wall of the slot 10 to the bottom end of the fourth gear 20, so that when the locking block 9 on the second transmission rod 732 engages with the slot 10, the second rack 21 is located below the fourth gear 20.

[0044] When the first rod 41 drives the second rod 42 to slide towards the fixed plate 2, the first rod 41 drives the second transmission rod 732 to move downward. The second rack 21 and the fourth gear 20 on the second transmission rod 732 mesh, driving the fourth gear 20 to rotate. This causes the lead screw 19 to rotate, driving the threaded sleeve 18 and the piston 17 to slide away from the suction cup 15. This allows the suction cup 15 to adhere and fix the teaching objects on the placement plate 6, preventing the teaching objects on the placement plate 6 from tipping over and falling onto the students during the movement of the sliding rod 3. Then, the second transmission rod 732 continues to move downward, causing the locking block 9 to engage with the locking groove 10, and disengaging the second rack 21 from the fourth gear 20. The separation of the screw 19 and the second rack 21 prevents interference when the placement plate 6 and the fixed plate 2 rotate relative to each other. Since the sliding rod 3 slides the same distance from the front row to the back row and from the back row to the front row, the placement plate 6 returns to its initial position when it moves from the back row to the front row. That is, the position of the fourth gear 20 corresponds to the position of the second rack 21. When the first rod 41 drives the second transmission rod 732 to slide away from the fixed plate 2, the locking block 9 disengages from the locking groove 10. The second rack 21 drives the fourth gear 20 to reverse, causing the screw 19 to drive the piston 17 to slide towards the suction cup 15, which helps the teaching object to detach from the suction cup 15.

[0045] The implementation principle of this application embodiment is as follows: When the object to be displayed is large, the cover plate 25 is rotated away from the opening 22, so that the cover plate 25 opens the opening 22. The third rodless cylinder 26 is activated by the operation controller 27. The third rodless cylinder 26 drives the mounting plate 11 to move the fixing plate 2 and the placement plate 6 upward, moving the placement plate 6 to the required height. Then, the teaching object is placed on the placement plate 6. The teacher can rotate the placement plate 6 to show the students different positions of the teaching object, so that the students in the front row are less likely to block the view of the students in the back row and the side row, which helps the students in the back row and the side row to observe more clearly and ensures the teaching effect.

[0046] When the object to be displayed is small, after rotating the cover plate 25 to open the opening 22, place the teaching object in the center of the placement plate 6, above the suction cup 15. Then, operate the controller 27 to activate the first rodless cylinder 23. The first rodless cylinder 23 drives the sliding rod 3 to move the first rod body 41 above the placement plate 6, so that the connecting hole 14 on the second rod body 42 is aligned with the screw 52. Rotate the abutment block 53 to align the abutment block 53 with the connecting hole 14. Rotate the placement plate 6 to bring the fourth gear 20 to the initial position, that is, the position corresponding to the second rack 21. Then, operate the controller 27 to activate... The second rodless cylinder 24 is activated, which drives the first rod 41 to slide the second rod 42 and the second transmission rod 732 towards the fixed plate 2. The second rack 21 on the second transmission rod 732 gradually meshes with the fourth gear 20, causing the fourth gear 20 and the lead screw 19 to rotate. This causes the lead screw 19 to drive the piston 17 to slide away from the suction cup 15. The suction cup 15 then adheres to and fixes the teaching object until the connecting hole 14 on the connecting plate 51 passes through the corresponding abutment block 53 and screw 52. At this point, the locking block 9 on the second transmission rod 732 engages with the locking groove 10. The second rack 21 disengages from the fourth gear 20 on the lead screw 19, and the second rack 21 is positioned below the fourth gear 20. Then, the abutment block 53 is rotated so that it spans the connecting hole 14, with the side of the abutment block 53 near the fixed plate 2 abutting against the side of the connecting plate 51 away from the fixed plate 2. Next, the controller 27 is operated to activate the second rodless cylinder 24, which drives the first rod 41 to move the second rod 42 and the fixed plate 2 upward, causing the magnet 13 and the iron piece 12 to disengage, raising the teaching object on the placement plate 6 to above the students' heads when they are sitting. Then, the controller 27 is operated to activate... The first rodless cylinder 23 is activated, which drives the sliding rod 3 to move the first rod body 41 and the teaching object towards the direction closer to the back row. When the sliding rod 3 slides, the third gear 734 rolls along the first rack 735, thereby causing the third transmission rod 733 to drive the second transmission rod 732 and the first transmission rod 731 to rotate. Through the transmission of the second gear 72 and the first gear 71, the placement plate 6 drives the teaching object to rotate, thereby bringing the object closer to the students in the back row and on the side. At the same time, it helps students to see different positions of the teaching object, which to a certain extent ensures the teaching effect.

[0047] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A teaching demonstration system, comprising a document camera (1), characterized in that: The document camera stand (1) is detachably equipped with a fixed plate (2) for placing teaching objects. The teaching demonstration system also includes a sliding rod (3) for sliding on the classroom ceiling and a first driving component for being mounted on the classroom ceiling. The sliding rod (3) is located above the fixed plate (2). The sliding rod (3) slides towards or away from the back row of the classroom. A connecting rod (4) is slidably mounted on the sliding rod (3). The sliding direction of the connecting rod (4) is vertical. A second driving component is provided on the sliding rod (3) to drive the connecting rod (4) to slide towards or away from the fixed plate (2). A connecting rod (4) is provided on the connecting rod (4). A connector (5) is used to fix the fixed plate (2) and the connecting rod (4) relative to each other; a placement plate (6) for placing teaching objects is rotatably provided on the fixed plate (2), the rotation axis of the placement plate (6) is parallel to the sliding direction of the connecting rod (4), and a transmission component (7) is provided on the sliding rod (3) for driving the placement plate (6) to rotate when the sliding rod (3) slides; a rotating shaft (8) is provided on the placement plate (6), the rotating shaft (8) is rotatably provided on the fixed plate (2), and the transmission component (7) includes a first gear (71) sleeved on the rotating shaft (8), a second gear (72) rotatably provided on the fixed plate (2), and a gear provided on the sliding rod. (3) The transmission component (73) is used to drive the second gear (72) to rotate when the sliding rod (3) slides; the transmission component (73) includes a first transmission rod (731) coaxially connected to the second gear (72), a second transmission rod (732) rotatably disposed on the connecting rod (4), a third transmission rod (733) rotatably disposed on the sliding rod (3), a third gear (734) sleeved on the end of the third transmission rod (733) away from the fixed plate (2), and a first rack (735) for being disposed on the ceiling, the second transmission rod (732) and the third transmission rod The rotation axis of (733) is parallel to the rotation axis of the second gear (72). The second transmission rod (732) is slidably sleeved inside the third transmission rod (733). The sliding direction of the second transmission rod (732) is parallel to the sliding direction of the connecting rod (4). A locking block (9) is provided at one end of the second transmission rod (732) near the placement plate (6). The cross-section of the locking block (9) is polygonal. A slot (10) for engaging with the locking block (9) is provided on the first transmission rod (731). The length direction of the first rack (735) is parallel to the sliding direction of the sliding rod (3). The third gear (734) meshes with the first rack (735).

2. The teaching demonstration system according to claim 1, characterized in that: The physical display stand (1) is slidably provided with an installation plate (11), the sliding direction of the installation plate (11) is set in the vertical direction, the fixing plate (2) and the installation plate (11) are detachably connected, and the physical display stand (1) is provided with a sliding component for driving the installation plate (11) to slide.

3. The teaching demonstration system according to claim 2, characterized in that: The mounting plate (11) has an iron sheet (12) embedded on one side near the fixing plate (2), and a magnet (13) is embedded in the bottom wall of the fixing plate (2). The magnet (13) and the iron sheet (12) are in corresponding positions, and the magnet (13) and the iron sheet (12) are attracted to each other.

4. A teaching demonstration system according to any one of claims 1-3, characterized in that: The connector (5) includes a connecting plate (51) disposed on the side of the connecting rod (4) near the fixing plate (2), a screw (52) threadedly connected to the fixing plate (2), and an abutment block (53) fixedly connected to the side of the screw (52) near the connecting rod (4). The rotation axis of the screw (52) is parallel to the sliding direction of the connecting rod (4). The connecting plate (51) is provided with a connecting hole (14) for the abutment block (53) and the screw (52) to pass through. The abutment block (53) is used to abut against the side of the connecting plate (51) away from the fixing plate (2).

5. The teaching demonstration system according to claim 1, characterized in that: The placement plate (6) is provided with a suction cup (15) for adsorbing teaching objects. The suction cup (15) is connected to an air extraction pipe (16). A piston (17) is slidably disposed in the air extraction pipe (16). The piston (17) slides toward or away from the suction cup (15). A threaded sleeve (18) is provided at the end of the piston (17) away from the suction cup (15). The threaded sleeve (18) slides in the air extraction pipe (16). The sliding direction of the threaded sleeve (18) is parallel to the sliding direction of the piston (17). A lead screw (19) is rotatably inserted at the end of the air extraction pipe (16) away from the suction cup (15). The lead screw (19) is threadedly connected in the threaded sleeve (18).

6. A teaching demonstration system according to claim 5, characterized in that: The rotation axis of the lead screw (19) is perpendicular to the rotation axis of the placement plate (6). A fourth gear (20) is sleeved on one end of the lead screw (19) outside the suction pipe (16). A second rack (21) for meshing with the fourth gear (20) is provided on the second transmission rod (732). The distance from the bottom of the fourth gear (20) to the second gear (72) is greater than the length of the second rack (21). The distance from the end of the lead screw (19) away from the suction cup (15) to the center of the placement plate (6) is less than the horizontal distance from the second transmission rod (732) to the center of the placement plate (6). When the locking block (9) on the second transmission rod (732) engages with the locking groove (10), the second rack (21) is located below the fourth gear (20).

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