Interactive projection blackboard for mathematical courses and projection method thereof

Abstract

The invention discloses an interactive projection blackboard for mathematical courses and a projection method thereof, and particularly relates to the technical field of blackboards, a projection screen plate is arranged on the inner wall of the middle of a frame body, a bottom groove is formed in the inner wall of the bottom of the frame body, and a top groove is formed in the inner wall of the top of the frame body; blackboards are embedded in the two sides of the frame body, a rotating shaft is connected to the inner wall of the middle of the top groove through a bearing, a gear is connected to the outer wall of the middle of the rotating shaft, the tops of the two blackboards are embedded in the top groove, and racks are connected to the top ends of the two blackboards. The two sets of racks are engaged with the gear, and the engagement directions are opposite. The blackboard is driven by pulling the handle on one side to do outward translational motion, so that the blackboards on the two sides are synchronously pulled open, and meanwhile, the two blackboards can be driven by the first servo motor to do reciprocating translational motion, so that automatic displacement of the blackboards is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of blackboards, and more specifically, to an interactive projection blackboard for mathematics courses and a projection method thereof. Background Art

[0002] Blackboard is a commonly used item in the teaching process. Teachers use chalk to write and draw teaching content on the blackboard. However, with the application of projection equipment in the teaching process, teachers use projection equipment to project images onto the screen to facilitate teaching.

[0003] After searching, the existing patent publication number: CN112793338A discloses a projection blackboard for education and teaching, which relates to the technical field related to projection blackboards, including a concave plate and a blackboard, the blackboard is slidably installed in the inner cavity of the concave plate, and U-shaped slide grooves are opened on both sides of the inner cavity of the concave plate, and first protective devices are arranged on both sides of the inner cavity, and both sides of the blackboard are slidably installed in the inner cavity of the U-shaped slide groove, and a projection screen panel is fixedly installed on one side, and a second protective device is arranged on the left and right sides of the concave plate. The present invention is a projection blackboard for education and teaching. By setting the first protective device and the second protective device, the blackboard can be made more convenient to slide and flip in the inner cavity of the U-shaped slide groove. By setting the flipping device, the space occupied by the blackboard can be reduced when flipping, making the blackboard more convenient to use. At the same time, when projecting the screen, there is no need to push and pull the blackboard, so that the use space of the blackboard is increased when it is used. In the process of realizing this application, the inventor found that the prior art has the following problems:

[0004] During use, the existing projection blackboard often requires manual pulling of the blackboards on both sides before projection can be used, and it does not have the effect of synchronous movement. At the same time, after the projection is completed, the blackboard is returned to its original position without a limiting mechanism to fix the blackboard, which makes it easy for the blackboard to move at will and affect teaching and writing. At the same time, it is often impossible to touch the projection area for interactive teaching during projection.

[0005] Application Contents

[0006] In order to overcome the above-mentioned defects of the prior art, the present application provides an interactive projection blackboard for mathematics courses and a projection method thereof to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions: an interactive projection blackboard for mathematics courses, comprising a frame body, a projection screen is arranged on the middle inner wall of the frame body, a bottom groove is arranged on the bottom inner wall of the frame body, a top groove is arranged on the top inner wall of the frame body, blackboards are embedded on both sides of the frame body, two groups of blackboards correspond to each other, two ends of the two groups of blackboards are respectively embedded in the bottom groove and the top groove, handles are arranged on opposite sides of the two groups of blackboards, the bottom end of the blackboard is connected with auxiliary balls, the auxiliary balls are embedded in the bottom groove, the middle inner wall of the top groove is connected with a rotating shaft through a bearing, the middle outer wall of the rotating shaft is connected with a gear, the sides of the two groups of blackboards close to each other are penetrated with a rotating rod, the two ends of the rotating rod pass through the blackboard and are connected with sliding limit blocks through damping bearings, the two groups of sliding limit blocks are respectively embedded in the top groove and the bottom groove, one end of the top sliding limit block is connected with a rack, and the two groups of racks are meshed with the gear and the meshing directions are opposite.

[0008] Preferably, the top inner walls on both sides of the top groove are provided with limiting slide grooves, the top of the two groups of racks away from the connected blackboard is connected with a sliding block, the sliding block is embedded in the limiting slide groove, the inner walls of the two groups of limiting slide grooves at one end close to each other are connected with a trigger switch, the outer walls of the two groups of blackboards at the opposite end are embedded with hidden magnetic strips, and the two groups of hidden magnetic strips are adsorbed on each other.

[0009] Preferably, a card slot is provided at the bottom end of the adjacent side of the two groups of blackboards, and a fixing mechanism is provided at the center of the bottom end of the frame body, the fixing mechanism includes a limit box, a movable plate, a top block, a curved surface and a spring, a movable plate is embedded in the limit box, both sides of the top of the movable plate are connected with top blocks, one end of the top block away from the movable plate passes through the frame body and is embedded in the card slot, the top of the top block is provided with a curved surface, both sides of the bottom of the movable plate are connected with springs, and the bottom end of the spring abuts against the inner wall of the limit box.

[0010] Preferably, a movable column is connected to the center of the bottom end of the movable plate, an L-shaped groove is provided on one side outer wall of the movable column, an adjustment cylinder is sleeved on the bottom outer wall of the movable column, the adjustment cylinder and the limit box are connected by a bearing, a limit block is provided on the inner wall of the adjustment cylinder, and the limit block is embedded in the L-shaped groove.

[0011] Preferably, one end of the adjusting cylinder away from the movable column passes through a limit box and is connected to an adjusting knob, and twisting the adjusting knob drives the adjusting cylinder to rotate, and the rotation of the adjusting cylinder drives the limit block to rotate so as to move in the L-shaped groove.

[0012] Preferably, a protective box is provided at the top center of the frame body, and a servo motor No. 1 is connected to the center of the bottom inner wall of the protective box. The output end of the servo motor No. 1 is connected to the rotating shaft. The servo motor No. 1 drives the rotating shaft to rotate, and the rotation of the rotating shaft drives the gear to rotate synchronously. The rotation of the gear drives the racks on both sides to translate in relative directions, and the movement of the two groups of racks drives the two groups of blackboards to move synchronously.

[0013] Preferably, the top inner wall of the protective box is connected to a No. 2 servo motor, the top outer wall of the protective box is connected to a rotating column through a bearing, the top of the rotating column is connected to a connecting frame, the end of the connecting frame is connected to a projector, the output end of the No. 2 servo motor is connected to the rotating column, the No. 2 servo motor drives the rotating column to rotate, the rotation of the rotating column drives the connecting frame to rotate, and the rotation of the connecting frame drives the projector to rotate synchronously.

[0014] Preferably, a storage box is provided on one side of the top of the frame body, and the storage box matches the connecting frame.

[0015] Preferably, infrared sensors are arranged at the edge of the projection screen, an infrared emitter is arranged on the side opposite to the infrared sensor, a control cabinet is arranged on the bottom side of the frame body, and the infrared emitter, infrared sensor, projector and trigger switch are all connected to the control cabinet through wires.

[0016] Preferably, the projection method comprises the following steps:

[0017] Step 1: First, fix the frame body on the wall where the blackboard is to be installed in the classroom by bolts. When projection is required, pull the handle on one side to drive the blackboard to move outward. The movement of the blackboard on one side drives the corresponding rack to move synchronously. The movement of the rack drives the gear to rotate, thereby driving the rack on the other side to rotate, thereby driving the corresponding blackboard to move horizontally, so as to realize the synchronous opening of the blackboards on both sides, so as to display the projection screen;

[0018] Step 2: When the blackboards on both sides are pulled apart to the edge so that the entire projection screen is displayed, the blackboards on both sides are displaced to the edge, thereby driving the slider to move to the edge of the limit slide slot and abut against the trigger switch. After the trigger switch contacts, a signal is transmitted to the control cabinet, and the projector is turned on through the control component of the control cabinet, so that the blackboard is pulled apart to automatically turn on the projector for projection;

[0019] Step 3: The projection screen is projected by the projector, thereby realizing the diversity of mathematics teaching. At the same time, the infrared sensors and infrared emitters arranged at the edge of the projection screen are arranged in a grid shape to form an infrared light curtain. When the projection screen is touched, part of the infrared light will be blocked. The light changes received by the infrared sensor will be converted into touch signals, which are transmitted to the control cabinet. The processor inside the control cabinet processes the signal and transmits it to the projector, thereby realizing the operation of the projected content and realizing the interactivity of the content.

[0020] Step 4: After the projection is finished, the blackboard can be pushed closed or the blackboards on both sides can be closed by driving the No. 1 servo motor. After the blackboards on both sides are closed, they are adsorbed by hidden magnetic strips. At the same time, when the blackboard moves to the top block position, the top block is compressed and shrinks into the limit box. When the blackboards on both sides are merged, the card slot is driven to move to the position of the top block. The elastic force of the spring makes the top block embedded in the card slot to further limit the blackboard to avoid random shaking. When the blackboard needs to be locked, the adjusting knob can be twisted to lock the top block so that the blackboard cannot be moved. At the same time, the No. 2 servo motor drives the rotating column and the connecting frame to rotate so that the projector can be stored in the storage box, thereby protecting the projector when it is not in use.

[0021] Technical effects and advantages of this application:

[0022] 1. The present application drives the blackboard to move outward in translation by pulling the handle on one side. The movement of the blackboard on one side drives the corresponding rack to move synchronously. The movement of the rack drives the gear to rotate, thereby driving the rack on the other side to rotate, thereby driving the corresponding blackboard to move in translation, thereby realizing the synchronous opening of the blackboards on both sides. At the same time, the No. 1 servo motor can drive the two groups of blackboards to perform reciprocating translational motion, thereby realizing automatic displacement of the blackboard, avoiding artificial pushing of the blackboard to open or merge, and the No. 1 servo motor cooperates with pulling the handle to realize the opening of the blackboard in multiple ways.

[0023] 2. When the blackboard moves to the top block position, the top block is compressed and retracted into the limit box. When the blackboards on both sides are merged, the card slot is driven to move to the position of the top block. The elastic force of the spring makes the top block embedded in the card slot to further limit the blackboard. The adjusting cylinder is rotated by twisting the adjusting knob. The rotation of the adjusting cylinder drives the limit block to rotate and move to the bottom side of the L-shaped groove, thereby limiting the movable column so that it cannot retract, thereby locking the blackboard.

[0024] 3. The infrared sensors and infrared emitters arranged at the edge of the projection screen are arranged in a grid shape to form an infrared light curtain. When the projection screen is touched, part of the infrared light will be blocked, and the light changes received by the infrared sensor will be converted into touch signals. The touch signals are transmitted to the control cabinet, and the processor inside the control cabinet processes the signals and transmits them to the projector, thereby realizing the operation of the projected content and achieving the interactivity of the content. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0026] Figure 2 This is a schematic diagram of the three-dimensional structure of the blackboard in this application;

[0027] Figure 3 This is a schematic diagram of the connection structure between the gear and the rack of this application;

[0028] Figure 4 This is a schematic diagram of the front structure of the present application;

[0029] Figure 5 This is a schematic diagram of the fixing mechanism structure of this application;

[0030] Figure 6 This is a schematic diagram of the connection structure between the connection frame and the projector of the present application;

[0031] Figure 7 This is a schematic diagram of the projection screen structure of this application;

[0032] Figure 8 This is a schematic diagram of the structure of the blackboard after tilting in this application.

[0033] The accompanying drawings are marked as follows: 1. frame body; 2. projection screen board; 3. bottom groove; 4. top groove; 5. blackboard; 6. handle; 7. auxiliary ball; 8. rotating shaft; 9. gear; 10. rack; 11. limit slide groove; 12. slider; 13. trigger switch; 14. hidden magnetic strip; 15. card slot; 16. fixing mechanism; 17. limit box; 18. movable plate; 19. top block; 20. arc surface; 21. spring; 22. movable column; 23. L-shaped groove; 24. adjustment cylinder; 25. limit block; 26. adjustment knob; 27. protective box; 28. No. 1 servo motor; 29. ​​No. 2 servo motor; 30. rotating column; 31. connecting frame; 32. projector; 33. storage box; 34. control cabinet; 35. infrared sensor; 36. infrared transmitter; 37. rotating rod; 38. sliding limit block. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] Example 1

[0036] As attached Figures 1 to 8 An interactive projection blackboard for mathematics courses shown in the figure comprises a frame body 1, a projection screen 2 is arranged in the middle of the frame body 1, a bottom groove 3 is arranged on the bottom inner wall of the frame body 1, a top groove 4 is arranged on the top inner wall of the frame body 1, blackboards 5 are embedded on both sides of the frame body 1, two sets of blackboards 5 correspond to each other, both ends of the two sets of blackboards 5 are respectively embedded in the bottom groove 3 and the top groove 4, handles 6 are arranged on the opposite sides of the two sets of blackboards 5, and the bottom ends of the blackboards 5 are connected to auxiliary balls 7, and the auxiliary balls 7 Embedded in the bottom groove 3, the middle inner wall of the top groove 4 is connected to the rotating shaft 8 through a bearing, the middle outer wall of the rotating shaft 8 is connected to a gear 9, the two sets of blackboards 5 are connected to the side close to each other with a rotating rod 37, both ends of the rotating rod 37 pass through the blackboard 5 and are connected to sliding limit blocks 38 through damping bearings, the two sets of sliding limit blocks 38 are respectively embedded in the top groove 4 and the bottom groove 3, one end of the top sliding limit block 38 is connected to a rack 10, and the two sets of racks 10 are meshed with the gear 9 and the meshing directions are opposite.

[0037] Among them, the frame body 1 plays a fixing role and can be connected and fixed to the classroom wall by bolts, and plays a limiting role. The projection screen board 2 can perform screen projection work. When projection is required, one side handle 6 can be pulled to drive the blackboard 5 to move outward. The movement of the blackboard 5 on one side drives the corresponding sliding limit block 38 to move, thereby driving the rack 10 to move synchronously. The movement of the rack 10 drives the gear 9 to rotate, thereby driving the rack 10 on the other side to rotate, thereby driving the corresponding blackboard 5 to move horizontally, thereby realizing the synchronous opening of the blackboards on both sides. While the rack 10 plays a limiting role, when the blackboard 5 is pulled apart and moved to the frame body 1, the rack 10 always acts in the frame body 1. It plays a certain supporting role to prevent the blackboard 5 from tilting when it is moved out. When the two groups of blackboards 5 move to the edge, rotating the blackboard 5 can drive the rotating rod 37 to rotate synchronously in the middle of the sliding limit block 38, so that the blackboard 5 can rotate and deviate at a certain angle with the rotating rod 37 as the center of the circle. At the same time, the connection effect of the damping bearing makes the rotation damped to avoid random shaking. The angle of the blackboard 5 is adjusted to prevent the blackboard 5 from moving to the edge and affecting the viewing at a farther position, so that the blackboard 5 is still not affected in the projection process. When the blackboard 5 is retracted into the frame body 1, it can be limited by auxiliary balls 7 and the like so that it cannot rotate.

[0038] Example 2

[0039] Based on Example 1, the solution in Example 1 is further detailed in combination with the following specific working method. Figures 1 to 8 As shown, see the following description for details:

[0040] Limiting grooves 11 are provided on the top inner walls on both sides of the top groove 4, and sliding blocks 12 are connected to the tops of the ends of the two groups of racks 10 away from the connected blackboard 5, and the sliding blocks 12 are embedded in the limiting grooves 11. The inner walls of the two groups of limiting grooves 11 at the ends close to each other are connected with trigger switches 13, and the outer walls of the opposite ends of the two groups of blackboards 5 are embedded with hidden magnetic strips 14, and the two groups of hidden magnetic strips 14 are adsorbed on each other, wherein the sliding blocks 12 are embedded in the limiting grooves 11 to play a limiting role, so that the blackboard 5 can slide along the limiting grooves 11 when it is moved out, and the trigger switch 13 will transmit a signal to the control cabinet 34 when it contacts the sliding blocks 12, and the projector 32 is controlled to turn on by the control cabinet 34, thereby achieving the effect of automatically turning on the projector 32 by pulling open the blackboard 5.

[0041] As a preferred embodiment, a card slot 15 is provided at the bottom end of the side close to the two groups of blackboards 5, and a fixing mechanism 16 is provided at the center of the bottom end of the frame body 1. The fixing mechanism 16 includes a limit box 17, a movable plate 18, a top block 19, a curved surface 20 and a spring 21. The movable plate 18 is embedded in the limit box 17, and both sides of the top of the movable plate 18 are connected to the top block 19. The end of the top block 19 away from the movable plate 18 passes through the frame body 1 and is embedded in the card slot 15. The top of the top block 19 is provided with a curved surface 20. The movable plate Springs 21 are connected to both sides of the bottom of 18, and the bottom ends of the springs 21 are in contact with the inner walls of the limit box 17, wherein the fixing mechanism 16 can be used to limit the blackboards 5 on both sides when they are merged to a certain extent, so as to prevent the blackboards 5 from moving randomly after they are merged. When the blackboards 5 move to the position of the top block 19, the top block 19 is compressed and shrinks into the limit box 17. When the blackboards 5 on both sides are merged, the slot 15 is driven to move to the position of the top block 19, and the elastic force of the springs 21 makes the top block 19 embedded in the slot 15, thereby further limiting the blackboard 5.

[0042] Furthermore, a movable column 22 is connected to the center of the bottom end of the movable plate 18, and an L-shaped groove 23 is provided on the outer wall of one side of the movable column 22. An adjusting cylinder 24 is sleeved on the outer wall of the bottom of the movable column 22. The adjusting cylinder 24 is connected to the limit box 17 through a bearing. A limit block 25 is provided on the inner wall of the adjusting cylinder 24, and the limit block 25 is embedded in the L-shaped groove 23. The movable column 22 can move synchronously with the movement of the movable plate 18, and the movable column 22 can move up and down in the adjusting cylinder 24. The limit block 25 is embedded in the L-shaped groove 23 to achieve a certain limiting effect.

[0043] Furthermore, one end of the adjusting tube 24 away from the movable column 22 passes through the limit box 17 and is connected to an adjusting knob 26. The adjusting knob 26 is twisted to rotate and drive the adjusting tube 24 to rotate. The adjusting tube 24 rotates and drives the limit block 25 to rotate, thereby displacing in the L-shaped groove 23. When the top block 19 needs to be limited and fixed, the adjusting tube 24 is rotated by twisting the adjusting knob 26. The adjusting tube 24 rotates and drives the limit block 25 to rotate and move to the bottom side of the L-shaped groove 23, thereby limiting the movable column 22 so that it cannot shrink, thereby locking the blackboard 5.

[0044] As a preferred embodiment, a protective box 27 is provided at the top center of the frame body 1, and a servo motor 28 is connected to the bottom inner wall center of the protective box 27. The output end of the servo motor 28 is connected to the rotating shaft 8. The servo motor 28 drives the rotating shaft 8 to rotate, and the rotation of the rotating shaft 8 drives the gear 9 to rotate synchronously. The rotation of the gear 9 drives the racks 10 on both sides to perform translational movement in relative directions. The movement of the two groups of racks 10 drives the two groups of blackboards 5 to perform synchronous movement, wherein the two groups of blackboards 5 can be driven by the servo motor 28 to perform reciprocating translational movement, thereby realizing the automatic displacement of the blackboard 5, avoiding artificially pushing the blackboard 5 to open or merge, and the servo motor 28 cooperates with pulling the handle 6 to realize the opening of the blackboard 5 in various ways.

[0045] As a preferred embodiment, the top inner wall of the protective box 27 is connected to a No. 2 servo motor 29, and the top outer wall of the protective box 27 is connected to a rotating column 30 through a bearing. The top of the rotating column 30 is connected to a connecting frame 31, and the end of the connecting frame 31 is connected to a projector 32. The output end of the No. 2 servo motor 29 is connected to the rotating column 30. The No. 2 servo motor 29 drives the rotating column 30 to rotate, and the rotation of the rotating column 30 drives the connecting frame 31 to rotate, and the rotation of the connecting frame 31 drives the projector 32 to rotate synchronously. The projector 32 is a short-focus projector that can project a larger picture at a closer distance. The projector 32 can be projected without installing the projector 32 on the ceiling, so as to avoid blocking the picture during teaching in the classroom. When the projector 32 needs to be stored, the No. 2 servo motor 29 can be used to drive the rotating column 30 to rotate, and the rotation of the rotating column 30 drives the connecting frame 31 to rotate, and the rotation of the connecting frame 31 drives the projector 32 to rotate synchronously, thereby moving the projector 32 into the storage box 33 for protective storage.

[0046] As a preferred embodiment, a storage box 33 is provided on the top side of the frame body 1, and the storage box 33 matches the connecting frame 31, wherein the storage box 33 serves to store the projector 32 and move it into the storage box 33 for protection, so as to avoid damage to the connecting frame 31 and the projector 32 when not in use.

[0047] As a preferred embodiment, infrared sensors 35 are arranged at the edge of the projection screen 2, and an infrared emitter 36 is arranged on the side opposite to the infrared sensor 35. A control cabinet 34 is arranged on the bottom side of the frame body 1. The infrared emitter 36, the infrared sensor 35, the projector 32 and the trigger switch 13 are all connected to the control cabinet 34 through wires. The infrared sensors 35 and the infrared emitters 36 arranged at the edge of the projection screen 2 are arranged in a grid shape to form an infrared light curtain. When the projection screen 2 is touched, part of the infrared light will be blocked, and the light changes received by the infrared sensor 35 will be converted into touch signals, which are transmitted to the control cabinet 34. The processor inside the control cabinet 34 processes the signal and transmits it to the projector 32, thereby realizing the operation of the projected content and realizing the interactivity of the content.

[0048] The working process of the present application is as follows: first, the frame body 1 is fixedly installed on the wall of the classroom where the blackboard 5 is to be installed by bolts for fixed connection. When projection is required, one side handle 6 can be pulled to drive the blackboard 5 to move outward in a translational manner. The movement of one side of the blackboard 5 drives the corresponding rack 10 to move synchronously. The movement of the rack 10 drives the gear 9 to rotate, thereby driving the other side rack 10 to rotate, thereby driving the corresponding blackboard 5 to move in a translational manner, thereby realizing the synchronous opening of the blackboards 5 on both sides, thereby displaying the projection screen 2. When the two groups of blackboards 5 move to the edge, rotating the blackboard 5 can drive the rotating rod 37 to move in the middle of the sliding limit block 38. The blackboard 5 rotates synchronously with the rotating rod 37 as the center, so that the blackboard 5 can be rotated and offset at a certain angle, thereby adjusting the angle of the blackboard 5, so that after the blackboard 5 moves to the edge, it can still be clearly viewed at a farther position. When the blackboards 5 on both sides are pulled apart to the edge so that the entire projection screen 2 is displayed, the blackboards 5 on both sides are displaced to the edge, thereby driving the slider 12 to move to the edge of the limit slide groove 11 and abut against the trigger switch 13. After the trigger switch 13 contacts, a signal is transmitted to the control cabinet 34, and the projector 32 is controlled to start up through the control component of the control cabinet 34, so that the blackboard 5 is pulled apart to automatically start up the projector 32 for projection.

[0049] The projection screen 2 is projected by the projector 32, thereby realizing the diversity of mathematics teaching. At the same time, the infrared sensors 35 and the infrared emitters 36 arranged at the edge of the projection screen 2 are arranged in a grid shape, thereby forming an infrared light curtain. When the projection screen 2 is touched, part of the infrared light will be blocked, and the light changes received by the infrared sensor 35 will be converted into touch signals, which are transmitted to the control cabinet 34. The processor inside the control cabinet 34 processes the signal and transmits it to the projector 32, thereby realizing the operation of the projected content and realizing the interactivity of the content. After the projection is finished, the blackboard 5 can be pushed to close or the blackboards 5 on both sides can be driven to close by the No. 1 servo motor 28. After the blackboards 5 on both sides are closed, they are adsorbed by the hidden magnetic strips 14, and fixed and limited by the fixing mechanism 16.

[0050] Based on the same inventive concept, the embodiment of the present application also provides a projection method, comprising the following steps:

[0051] Step 1: First, the frame body 1 is fixedly installed on the wall of the classroom where the blackboard 5 is to be installed by bolts. When projection is required, the handle 6 on one side can be pulled to drive the blackboard 5 to move outward in a translational manner. The movement of the blackboard 5 on one side drives the corresponding rack 10 to move synchronously. The movement of the rack 10 drives the gear 9 to rotate, thereby driving the rack 10 on the other side to rotate, thereby driving the corresponding blackboard 5 to move in a translational manner, thereby realizing the synchronous opening of the blackboards 5 on both sides, so as to display the projection screen 2;

[0052] Step 2: When the blackboards 5 on both sides are pulled apart to the edge so that the entire projection screen 2 is displayed, the blackboards 5 on both sides are displaced to the edge, thereby driving the slider 12 to move to the edge of the limit slide 11 and abut against the trigger switch 13. After the trigger switch 13 contacts, a signal is transmitted to the control cabinet 34, and the control component of the control cabinet 34 controls the projector 32 to start, so that the blackboard 5 is pulled apart to automatically start the projector 32 for projection;

[0053] Step 3: The projection screen 2 is projected by the projector 32, thereby realizing the diversity of mathematics teaching. At the same time, the infrared sensors 35 and the infrared emitters 36 arranged at the edge of the projection screen 2 are arranged in a grid shape, thereby forming an infrared light curtain. When the projection screen 2 is touched, part of the infrared light will be blocked, and the light changes received by the infrared sensor 35 will be converted into touch signals. The touch signals are transmitted to the control cabinet 34, and the processor inside the control cabinet 34 processes the signals and transmits them to the projector 32, thereby realizing the operation of the projected content and realizing the interactivity of the content.

[0054] Step 4: After the projection is finished, the blackboard 5 can be pushed to close or the blackboards 5 on both sides can be driven to close by the No. 1 servo motor 28. After the blackboards 5 on both sides are closed, they are adsorbed by the hidden magnetic strips 14. At the same time, when the blackboard 5 moves to the position of the top block 19, the top block 19 is compressed and shrinks into the limit box 17. When the blackboards 5 on both sides are merged, the card slot 15 is driven to move to the position of the top block 19. The elastic force of the spring 21 makes the top block 19 embedded in the card slot 15, thereby further limiting the blackboard 5 to avoid random shaking. When the blackboard 5 needs to be locked, the adjusting knob 26 can be twisted to lock the top block 19 so that the blackboard 5 cannot be moved. At the same time, the No. 2 servo motor 29 drives the rotating column 30 and the connecting frame 31 to rotate so that the projector 32 is stored in the storage box 33, thereby protecting the projector 32 when it is not in use.

Claims

1. An interactive projection blackboard for mathematics courses, comprising a frame body (1), characterized in that: A projection screen (2) is arranged on the inner wall of the middle part of the frame body (1), a bottom groove (3) is arranged on the inner wall of the bottom part of the frame body (1), and a top groove (4) is arranged on the inner wall of the top part of the frame body (1). Blackboards (5) are embedded on both sides of the frame body (1), and two groups of blackboards (5) correspond to each other. Both ends of the two groups of blackboards (5) are respectively embedded in the bottom groove (3) and the top groove (4). Handles (6) are arranged on opposite sides of the two groups of blackboards (5). Auxiliary balls (7) are connected to the bottom ends of the blackboards (5), and the auxiliary balls (7) are embedded in the bottom groove (3). The middle inner wall of the top groove (4) is connected to a rotating shaft (8) via a bearing, the middle outer wall of the rotating shaft (8) is connected to a gear (9), the two groups of blackboards (5) are connected to a rotating rod (37) on the side close to each other, the two ends of the rotating rod (37) pass through the blackboard (5) and are connected to sliding limit blocks (38) via damping bearings, the two groups of sliding limit blocks (38) are respectively embedded in the top groove (4) and the bottom groove (3), one end of the top sliding limit block (38) is connected to a rack (10), and the two groups of racks (10) are meshed with the gear (9) and the meshing directions are opposite.

2. The interactive projection blackboard for mathematics courses according to claim 1, characterized in that: The top inner walls on both sides of the top groove (4) are provided with limit slide grooves (11); the tops of the ends of the two groups of racks (10) away from the connected blackboards (5) are connected with sliders (12); the sliders (12) are embedded in the limit slide grooves (11); the inner walls of the ends of the two groups of limit slide grooves (11) close to each other are connected with trigger switches (13); the outer walls of the opposite ends of the two groups of blackboards (5) are embedded with hidden magnetic strips (14); the two groups of hidden magnetic strips (14) are attracted to each other.

3. The interactive projection blackboard for mathematics courses according to claim 2, characterized in that: A slot (15) is provided at the bottom end of the adjacent side of the two groups of blackboards (5); a fixing mechanism (16) is provided at the center of the bottom end of the frame body (1); the fixing mechanism (16) comprises a limit box (17), a movable plate (18), a top block (19), a curved surface (20) and a spring (21); a movable plate (18) is embedded in the limit box (17); both sides of the top of the movable plate (18) are connected to the top blocks (19); one end of the top block (19) away from the movable plate (18) passes through the frame body (1) and is embedded in the slot (15); a curved surface (20) is provided at the top of the top block (19); both sides of the bottom of the movable plate (18) are connected to the spring (21); the bottom end of the spring (21) abuts against the inner wall of the limit box (17).

4. The interactive projection blackboard for mathematics courses according to claim 3, characterized in that: A movable column (22) is connected to the center of the bottom end of the movable plate (18); an L-shaped groove (23) is arranged on one side outer wall of the movable column (22); an adjusting cylinder (24) is sleeved on the bottom outer wall of the movable column (22); the adjusting cylinder (24) is connected to the limit box (17) via a bearing; a limit block (25) is arranged on the inner wall of the adjusting cylinder (24); and the limit block (25) is embedded in the L-shaped groove (23).

5. The interactive projection blackboard for mathematics courses according to claim 4, characterized in that: One end of the adjusting cylinder (24) away from the movable column (22) passes through the limit box (17) and is connected to an adjusting knob (26). Turning the adjusting knob (26) drives the adjusting cylinder (24) to rotate, and the rotation of the adjusting cylinder (24) drives the limit block (25) to rotate, thereby moving in the L-shaped groove (23).

6. The interactive projection blackboard for mathematics courses according to claim 3, characterized in that: A protective box (27) is arranged at the center of the top of the frame body (1), and a servo motor (28) is connected to the center of the bottom inner wall of the protective box (27). The output end of the servo motor (28) is connected to the rotating shaft (8). The servo motor (28) drives the rotating shaft (8) to rotate, and the rotation of the rotating shaft (8) drives the gear (9) to rotate synchronously. The rotation of the gear (9) drives the racks (10) on both sides to translate in relative directions. The movement of the two groups of racks (10) drives the two groups of blackboards (5) to move synchronously.

7. The interactive projection blackboard for mathematics courses according to claim 6, characterized in that: The top inner wall of the protective box (27) is connected to a No. 2 servo motor (29), the top outer wall of the protective box (27) is connected to a rotating column (30) through a bearing, the top of the rotating column (30) is connected to a connecting frame (31), the end of the connecting frame (31) is connected to a projector (32), the output end of the No. 2 servo motor (29) is connected to the rotating column (30), the No. 2 servo motor (29) drives the rotating column (30) to rotate, the rotation of the rotating column (30) drives the connecting frame (31) to rotate, and the rotation of the connecting frame (31) drives the projector (32) to rotate synchronously.

8. The interactive projection blackboard for mathematics courses according to claim 7, characterized in that: A storage box (33) is provided on one side of the top of the frame body (1), and the storage box (33) matches the connecting frame (31).

9. The interactive projection blackboard for mathematics courses according to claim 2, characterized in that: Infrared sensors (35) are arranged at the edge of the projection screen (2), an infrared emitter (36) is arranged on the side opposite to the infrared sensor (35), a control cabinet (34) is arranged on the bottom side of the frame body (1), and the infrared emitter (36), the infrared sensor (35), the projector (32) and the trigger switch (13) are all connected to the control cabinet (34) through wires.

10. A projection method for an interactive projection blackboard for mathematics courses, using the interactive projection blackboard for mathematics courses according to any one of claims 1 to 9, characterized in that: The projection method comprises the following steps: Step 1: First, the frame body (1) is fixedly mounted on the wall of the classroom where the blackboard (5) is to be installed by bolts. When projection is required, one side handle (6) can be pulled to drive the blackboard (5) to move outward in a translational manner. The movement of the blackboard (5) on one side drives the corresponding rack (10) to move synchronously. The movement of the rack (10) drives the gear (9) to rotate, thereby driving the rack (10) on the other side to rotate, thereby driving the corresponding blackboard (5) to move in a translational manner, thereby achieving the synchronous pulling apart of the blackboards (5) on both sides, thereby displaying the projection screen (2); Step 2: When the blackboards (5) on both sides are pulled apart to the edge so that the entire projection screen (2) is displayed, the blackboards (5) on both sides are displaced to the edge, thereby driving the slider (12) to move to the edge of the limit slide groove (11) and abut against the trigger switch (13). After the trigger switch (13) contacts, a signal is transmitted to the control cabinet (34), and the control component of the control cabinet (34) controls the projector (32) to start, thereby realizing the automatic start of the projector (32) for projection when the blackboard (5) is pulled apart; Step 3: The projection screen (2) is projected by the projector (32), thereby realizing the diversity of mathematics teaching. At the same time, the infrared sensors (35) and infrared emitters (36) arranged at the edge of the projection screen (2) are arranged in a grid shape, thereby forming an infrared light curtain. When the projection screen (2) is touched, part of the infrared light is blocked, and the light changes received by the infrared sensor (35) are converted into touch signals. The touch signals are transmitted to the control cabinet (34), and the processor inside the control cabinet (34) processes the signals and transmits them to the projector (32), thereby realizing the operation of the projected content and realizing the interactivity of the content. Step 4: After the projection is finished, the blackboard (5) can be pushed to close or the blackboards (5) on both sides can be driven to close by the No. 1 servo motor (28). After the blackboards (5) on both sides are closed, they are attracted to each other by the hidden magnetic strip (14). At the same time, when the blackboard (5) moves to the position of the top block (19), the top block (19) is compressed and retracted into the limit box (17). When the blackboards (5) on both sides are merged, the card slot (15) is driven to move to the position of the top block (19). The elastic force of the spring (21) causes the top block (19) to be moved. 19) is embedded in the card slot (15) to further limit the blackboard (5) to prevent it from shaking at will. If the blackboard (5) needs to be locked, the adjusting knob (26) can be twisted to lock the top block (19) so that the blackboard (5) cannot be moved. At the same time, the rotating column (30) and the connecting frame (31) are driven by the second servo motor (29) to rotate so that the projector (32) is stored in the storage box (33), thereby protecting the projector (32) when it is not in use.

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