Multimedia teaching device for mathematics teaching

Abstract

The application discloses a kind of multimedia teaching device for mathematics teaching, and the application relates to the field of teaching technology, and the application includes: guard frame, the guard frame is cylindrical, the bottom of the guard frame is fixedly connected with display stand, the right side of the guard frame is fixedly connected with motor;Bottom plate, the bottom plate is rectangular, the bottom of the bottom plate is provided with universal wheel, the top of the bottom plate is fixedly connected with electric push rod, the left side top of the bottom plate is fixedly connected with pull rod, the top of the electric push rod is fixedly connected with the bottom of display stand.The application starts motor to drive curling rod to curl projection cloth for protection after teaching is completed, when projection cloth is shrunk on the surface of curling rod, roller is contacted with the surface of projection cloth by the depression of semicircular frame, the surface of projection cloth is extruded by roller, to avoid projection cloth to appear loose when curling on the surface of curling rod, to cause the generation of wrinkle.

Description

Technical Field

[0001] This invention relates to the field of teaching technology, specifically to a multimedia teaching device for mathematics teaching. Background Technology

[0002] With the development of multimedia technology, multimedia teaching has entered the classroom. In the field of education, electronic teaching is gradually becoming the mainstream, and the use of multimedia electronic classrooms is quite common. Various schools and educational institutions have built dedicated multimedia classrooms, making school teaching very convenient and practical. When multimedia teaching is projected, a projection screen is needed to display the teaching content. Most projection screens need to be rolled up after use for protection. However, current projection screens are prone to wrinkles and damage when rolled up due to shaking. Therefore, we have proposed a multimedia teaching device for mathematics teaching. Summary of the Invention

[0003] To solve the above-mentioned technical problems, the present invention provides a multimedia teaching device for mathematics teaching, comprising: a protective frame, the protective frame being cylindrical, a display rack being fixedly connected to the bottom of the protective frame, and a motor being fixedly connected to the right side of the protective frame;

[0004] The base plate is rectangular and has casters at the bottom. An electric push rod is fixedly connected to the top of the base plate. The display rack can be height-adjusted via the electric push rod, which facilitates adjusting the height of the projection screen when using multimedia projection teaching. The display rack is located on the top of the base plate for easy movement. When students in corners have difficulty viewing the multimedia projection, the angle of the projection screen can be adjusted via the base plate to increase its practicality. A pull rod is fixedly connected to the top left side of the base plate, and the top of the electric push rod is fixedly connected to the bottom of the display rack.

[0005] The protective frame includes a movable plate, a curling rod, a roller, a projection cloth, a cleaning mechanism, a fixing mechanism, and a semi-circular frame. The semi-circular frame is movably connected to the top of the inner wall of the protective frame via the movable plate. The roller is rotatably connected to the inner wall of the semi-circular frame via a bearing. The curling rod is fixedly connected to the inner wall of the protective frame via a bearing. A fixing mechanism is provided on the surface of the curling rod. A cleaning mechanism is provided below the protective frame. The projection cloth is placed inside the display frame.

[0006] Furthermore, the right end of the coiling rod is fixedly connected to the output end of the motor, the roller contacts the outer surface of the coiling rod, and two sets of cleaning mechanisms are provided at the bottom of the protective frame.

[0007] Furthermore, the coiling rod includes a groove, a triangular groove, a slider, an arc groove, and a connecting block. The surface of the coiling rod has a groove, the interior of the coiling rod has a triangular groove, and the interior of the coiling rod has an arc groove. The triangular groove and the arc groove are interconnected. The interior of the coiling rod has a groove that matches the slider, facilitating the disassembly of the slider through the concave hole. The interior of the triangular groove has a slider, and the bottom of the slider is fixedly connected to the connecting block.

[0008] The upper surface of the slider is adapted to the inner wall of the triangular groove, and the lower surface of the slider is adapted to the inner wall of the circular arc groove.

[0009] Furthermore, the end of the arc groove away from the triangular groove penetrates the surface of the coiling rod, the connecting block extends to the outer end of the coiling rod through the arc groove, and the connecting block is fixedly connected to the projection cloth.

[0010] Furthermore, the cleaning mechanism includes an inclined plate, a sliding hole, a circular groove, a circular rod, a sliding block, and an arc-shaped scraper. The inclined plate is fixedly connected to the inner wall of the protective frame, and the circular rod is fixedly connected to the inclined plate. A sliding hole is opened at the center of the inner part of the circular rod, and a circular groove is opened inside the circular rod. The two inclined plates fix the arc-shaped scraper on the surface in an up-down arrangement. The two arc-shaped scrapers are arranged in a corresponding up-down arrangement, so that when the projection cloth slides on the surface of the arc-shaped scraper, it forms a C-shape to increase the pulling force. When the projection cloth is rolled up, the increased pulling force prevents wrinkles from forming. The sliding block contacts the inner wall of the sliding hole, and the arc-shaped scraper is fixedly connected to the sliding block.

[0011] The inclined plate is set at an angle downwards.

[0012] Furthermore, the circular groove is connected to the interior of the sliding hole, the sliding hole is T-shaped, and the sliding block extends to the outer end of the circular rod through the sliding hole.

[0013] Furthermore, the two arc-shaped scrapers are arranged vertically and are positioned correspondingly to each other, with the arc-shaped scrapers in contact with the surface of the projection cloth.

[0014] Furthermore, the display rack includes an arc-shaped hanging rod, an elastic plate, a perforated frame, a telescopic plate, a stop block, a rubber rod, and a multimedia projector. The arc-shaped hanging rod is movably connected to the top of the protective frame via a pivot. The telescopic plate is fixedly connected to the top of the inner wall of the display rack via a pivot. A telescopic plate is provided on the front of the display rack to seal the display rack. When the projection cloth is not used for a short period of time, the contact between the telescopic plate and the stop block can protect the projection cloth and increase its protective properties. The stop block is fixedly connected to the bottom of the inner wall of the display rack. The perforated frame is fixedly connected to the surface of the telescopic plate. The rubber rod is fixedly connected to the bottom of the projection cloth.

[0015] The telescopic plate and the protective frame are fixedly connected by elastic plates, and the multimedia projector is fixedly connected to the inner wall of the telescopic plate.

[0016] Furthermore, the bottom surface of the telescopic plate contacts the surface of the stop block, and the surface of the arc-shaped hanging rod is adapted to the inner wall of the circular hole frame.

[0017] The beneficial effects of this invention are as follows:

[0018] After the teaching is completed, the invention starts the motor to drive the curling rod to curl and protect the projection cloth. When the projection cloth shrinks on the surface of the curling rod, the roller contacts the surface of the projection cloth through the downward pressure of the semi-circular frame. The roller squeezes the surface of the projection cloth to prevent the projection cloth from loosening when curled on the surface of the curling rod, which would cause wrinkles. When the projection cloth is needed, the roller rotates with friction with the projection cloth to transport the projection cloth, increasing the protection.

[0019] The slider of this invention is adapted to the inner wall of the triangular groove and the circular groove. The contact between the circular groove and the bottom surface of the slider increases stability. When the projection cloth needs to be disassembled, the slider is pushed from the inside of the circular groove into the inside of the groove, and the projection cloth can be disassembled, which facilitates the cleaning and replacement of the projection cloth.

[0020] When the projection cloth of this invention is rolled up by the rolling rod, impurities on the surface of the projection cloth are cleaned by the arc-shaped scraper, which prevents debris from adhering to the surface of the projection cloth and causing damage. The two arc-shaped scrapers are arranged front and back to facilitate cleaning of both sides of the projection cloth and increase cleaning efficiency. The arc-shaped scraper is fixed inside the sliding hole by the sliding block, which makes it easy to disassemble and replace the arc-shaped scraper by pushing the sliding block into the circular groove through the sliding hole, which increases convenience.

[0021] This invention incorporates a multimedia projector inside a telescopic plate for projection. The telescopic plate is fixed by contact between an arc-shaped hanging rod and the inner wall of a circular hole frame. The distance of the multimedia projector can be adjusted via the telescopic plate to avoid unclear projection. The telescopic plate also increases stability by pressing the surface of the stop block with an elastic plate. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the right-side cross-sectional structure of the protective frame of the present invention;

[0024] Figure 3 This is a schematic diagram of the right-side cross-sectional structure of the coiling rod of the present invention;

[0025] Figure 4 This is a schematic cross-sectional view of the arc-shaped scraper structure of the present invention;

[0026] Figure 5 This is a schematic diagram of the right side of the display rack of the present invention.

[0027] 1. Protective frame; 2. Motor; 3. Display rack; 4. Electric push rod; 5. Base plate; 6. Casters; 7. Pull rod; 12. Movable plate; 13. Curling rod; 14. Roller rod; 15. Projection cloth; 16. Cleaning mechanism; 17. Fixing mechanism; 18. Semi-circular frame; 20. Groove; 21. Triangular groove; 22. Slider; 23. Arc groove; 24. Connecting block; 30. Inclined plate; 31. Sliding hole; 32. Circular groove; 33. Circular rod; 34. Sliding block; 35. Arc scraper; 40. Arc hanging rod; 41. Elastic plate; 42. Circular hole frame; 43. Telescopic plate; 44. Stop block; 45. Rubber rod; 46. Multimedia projector. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

[0029] Example 1

[0030] Please see Figures 1-4 This invention is a multimedia teaching device for mathematics teaching, comprising:

[0031] Protective frame 1 is cylindrical. A display rack 3 is fixedly connected to the bottom of the protective frame 1, and a motor 2 is fixedly connected to the right side of the protective frame 1.

[0032] The base plate 5 is rectangular. The bottom of the base plate 5 is equipped with casters 6. The top of the base plate 5 is fixedly connected to an electric push rod 4. The top left side of the base plate 5 is fixedly connected to a pull rod 7. The top of the electric push rod 4 is fixedly connected to the bottom of the display rack 3.

[0033] The protective frame 1 includes a movable plate 12, a coiling rod 13, a roller 14, a projection cloth 15, a cleaning mechanism 16, a fixing mechanism 17, and a semi-circular frame 18. The semi-circular frame 18 is movably connected to the top of the inner wall of the protective frame 1 via the movable plate 12. The roller 14 is rotatably connected to the inner wall of the semi-circular frame 18 via bearings. The coiling rod 13 is fixedly connected to the inner wall of the protective frame 1 via bearings. The fixing mechanism 17 is provided on the surface of the coiling rod 13. The cleaning mechanism 16 is provided at the bottom of the protective frame 1. The projection cloth 15 is placed inside the display rack 3. After the teaching is completed, the motor 2 is started to drive the curling rod 13 to curl and protect the projection cloth 15. When the projection cloth 15 shrinks on the surface of the curling rod 13, the roller 14 contacts the surface of the projection cloth 15 through the downward pressure of the semi-circular frame 18. The roller 14 squeezes the surface of the projection cloth 15 to prevent the projection cloth 15 from loosening when curled on the surface of the curling rod 13, which would cause wrinkles. When the projection cloth 15 needs to be used, the roller 14 rotates with the projection cloth 15 to transport the projection cloth 15, increasing its protective properties.

[0034] The right end of the coiling rod 13 is fixedly connected to the output end of the motor 2, the roller 14 contacts the outer surface of the coiling rod 13, and two sets of cleaning mechanisms 16 are provided at the bottom of the protective frame 1.

[0035] The coiling rod 13 includes a groove 20, a triangular groove 21, a slider 22, an arc groove 23, and a connecting block 24. The surface of the coiling rod 13 has a groove 20, the inside of the coiling rod 13 has a triangular groove 21, and the inside of the coiling rod 13 has an arc groove 23. The triangular groove 21 and the arc groove 23 are interconnected. The slider 22 is provided inside the triangular groove 21. The bottom of the slider 22 is fixedly connected to the connecting block 24. The slider 22 of this invention is adapted to the inner wall of the triangular groove 21 and the arc groove 23. The contact between the arc groove 23 and the bottom surface of the slider 22 increases the stability. When the projection cloth 15 needs to be disassembled, the slider 22 is pushed from the inside of the arc groove 23 into the inside of the groove 20, so that the projection cloth 15 can be disassembled, which is convenient for cleaning and replacement of the projection cloth 15.

[0036] The upper surface of slider 22 is adapted to the inner wall of triangular groove 21, and the lower surface of slider 22 is adapted to the inner wall of arc groove 23.

[0037] The end of the arc groove 23 away from the triangular groove 21 passes through the surface of the coiling rod 13, and the connecting block 24 extends through the arc groove 23 to the outer end of the coiling rod 13. The connecting block 24 is fixedly connected to the projection cloth 15.

[0038] The cleaning mechanism 16 includes an inclined plate 30, a sliding hole 31, a circular groove 32, a circular rod 33, a sliding block 34, and an arc-shaped scraper 35. The inclined plate 30 is fixedly connected to the inner wall of the protective frame 1, and the circular rod 33 is fixedly connected to the inclined plate 30. A sliding hole 31 is provided at the center of the circular rod 33, and a circular groove 32 is provided inside the circular rod 33. The sliding block 34 contacts the inner wall of the sliding hole 31, and the arc-shaped scraper 35 is fixedly connected to the sliding block 34. The projection cloth 15 of this invention is rolled up by the rolling rod 13. At the same time, the arc scraper 35 is used to clean the impurities on the surface of the projection cloth 15, so as to avoid the debris adhering to the surface of the projection cloth 15 and causing damage to the projection cloth 15. The two arc scrapers 35 are arranged front and back to facilitate cleaning the front and back of the projection cloth 15, increasing the cleaning efficiency. The arc scraper 35 is fixed inside the sliding hole 31 by the sliding block 34, which makes it easy to push the sliding block 34 into the circular groove 32 through the sliding hole 31 to disassemble and replace the arc scraper 35, increasing convenience.

[0039] The inclined plate 30 is set to tilt downwards.

[0040] The circular groove 32 is connected to the interior of the sliding hole 31. The sliding hole 31 is T-shaped, and the sliding block 34 extends to the outer end of the circular rod 33 through the sliding hole 31.

[0041] The two arc-shaped scrapers 35 are arranged vertically and are positioned correspondingly to each other, with the arc-shaped scrapers 35 in contact with the surface of the projection cloth 15.

[0042] Example 2

[0043] Please see Figures 1-5 This invention is a multimedia teaching device for mathematics teaching, comprising:

[0044] Protective frame 1 is cylindrical. A display rack 3 is fixedly connected to the bottom of the protective frame 1, and a motor 2 is fixedly connected to the right side of the protective frame 1.

[0045] The base plate 5 is rectangular. The bottom of the base plate 5 is equipped with casters 6. The top of the base plate 5 is fixedly connected to an electric push rod 4. The top left side of the base plate 5 is fixedly connected to a pull rod 7. The top of the electric push rod 4 is fixedly connected to the bottom of the display rack 3.

[0046] The protective frame 1 includes a movable plate 12, a coiling rod 13, a roller 14, a projection cloth 15, a cleaning mechanism 16, a fixing mechanism 17, and a semi-circular frame 18. The semi-circular frame 18 is movably connected to the top of the inner wall of the protective frame 1 through the movable plate 12. The roller 14 is rotatably connected to the inner wall of the semi-circular frame 18 through a bearing. The coiling rod 13 is fixedly connected to the inner wall of the protective frame 1 through a bearing. The fixing mechanism 17 is provided on the surface of the coiling rod 13. The cleaning mechanism 16 is provided at the bottom of the protective frame 1. The projection cloth 15 is located inside the display rack 3.

[0047] The right end of the coiling rod 13 is fixedly connected to the output end of the motor 2, the roller 14 contacts the outer surface of the coiling rod 13, and two sets of cleaning mechanisms 16 are provided at the bottom of the protective frame 1.

[0048] The coiling rod 13 includes a groove 20, a triangular groove 21, a slider 22, an arc groove 23, and a connecting block 24. The surface of the coiling rod 13 has a groove 20, the inside of the coiling rod 13 has a triangular groove 21, and the inside of the coiling rod 13 has an arc groove 23. The triangular groove 21 and the arc groove 23 are interconnected. The slider 22 is provided inside the triangular groove 21, and the bottom of the slider 22 is fixedly connected to the connecting block 24.

[0049] The upper surface of slider 22 is adapted to the inner wall of triangular groove 21, and the lower surface of slider 22 is adapted to the inner wall of arc groove 23.

[0050] The end of the arc groove 23 away from the triangular groove 21 passes through the surface of the coiling rod 13, and the connecting block 24 extends through the arc groove 23 to the outer end of the coiling rod 13. The connecting block 24 is fixedly connected to the projection cloth 15.

[0051] The cleaning mechanism 16 includes an inclined plate 30, a sliding hole 31, a circular groove 32, a circular rod 33, a sliding block 34, and an arc scraper 35. The inclined plate 30 is fixedly connected to the inner wall of the protective frame 1, the circular rod 33 is fixedly connected to the inclined plate 30, the circular rod 33 has a sliding hole 31 at its inner center, the circular rod 33 has a circular groove 32, the sliding block 34 contacts the inner wall of the sliding hole 31, and the arc scraper 35 is fixedly connected to the sliding block 34.

[0052] The inclined plate 30 is set to tilt downwards.

[0053] The circular groove 32 is connected to the interior of the sliding hole 31. The sliding hole 31 is T-shaped, and the sliding block 34 extends to the outer end of the circular rod 33 through the sliding hole 31.

[0054] The two arc-shaped scrapers 35 are arranged vertically and are positioned correspondingly to each other, with the arc-shaped scrapers 35 in contact with the surface of the projection cloth 15.

[0055] The display rack 3 includes an arc-shaped hanging rod 40, an elastic plate 41, a round hole frame 42, a telescopic plate 43, a stop block 44, a rubber rod 45, and a multimedia projector 46. The arc-shaped hanging rod 40 is movably connected to the top of the protective frame 1 via a pivot. The telescopic plate 43 is fixedly connected to the top of the inner wall of the display rack 3 via a pivot. The stop block 44 is fixedly connected to the bottom of the inner wall of the display rack 3. The round hole frame 42 is fixedly connected to the surface of the telescopic plate 43. The rubber rod 45 is fixedly connected to the bottom of the projection cloth 15. In this invention, a multimedia projector is installed inside the telescopic plate 43 for projection. The telescopic plate 43 is fixed by the contact between the arc-shaped hanging rod 40 and the inner wall of the round hole frame 42. The distance of the multimedia projector can be adjusted through the telescopic plate 43 to avoid unclear projection. The telescopic plate 43 increases stability by pressing the surface of the stop block 44 with the elastic plate 41.

[0056] The telescopic plate 43 is fixedly connected to the protective frame 1 through the elastic plate 41, and the multimedia projector 46 is fixedly connected to the inner wall of the telescopic plate 43.

[0057] The bottom surface of the telescopic plate 43 contacts the surface of the stop block 44, and the surface of the arc hanging rod 40 is adapted to the inner wall of the circular hole frame 42.

[0058] One specific application of this embodiment is as follows: After teaching is completed, the motor 2 is started to drive the curling rod 13 to curl and protect the projection cloth 15. When the projection cloth 15 shrinks onto the surface of the curling rod 13, the roller 14 contacts the surface of the projection cloth 15 through the downward pressure of the semi-circular frame 18. The roller 14 squeezes the surface of the projection cloth 15 to prevent the projection cloth 15 from loosening when curled onto the surface of the curling rod 13, thus preventing wrinkles. When the projection cloth 15 is curled by the curling rod 13, the arc-shaped scraper 35 cleans the impurities on the surface of the projection cloth 15 to prevent debris from adhering to the surface of the projection cloth 15 and causing damage. The two arc-shaped scrapers 35 are set in a front-to-back configuration. To facilitate cleaning of both sides of the projection cloth 15 and increase cleaning efficiency, the arc scraper 35 is fixed inside the sliding hole 31 by the sliding block 34. The slider 22 is adapted to the inner wall of the triangular groove 21 and the arc groove 23. The contact between the arc groove 23 and the bottom surface of the slider 22 increases stability. When the projection cloth 15 needs to be disassembled, the slider 22 is pushed from inside the arc groove 23 into the groove 20. The telescopic plate 43 is equipped with a multimedia projector for projection. The telescopic plate 43 is fixed by the contact between the arc hanging rod 40 and the inner wall of the round hole frame 42. The distance of the multimedia projector can be adjusted through the telescopic plate 43 to avoid unclear projection.

[0059] Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in the present invention, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A multimedia teaching device for mathematics teaching, characterized in that, include: A protective frame (1) is cylindrical, and a display rack (3) is fixedly connected to the bottom of the protective frame (1). A motor (2) is fixedly connected to the right side of the protective frame (1). The protective frame (1) includes a movable plate (12), a coiling rod (13), a roller (14), and a semi-circular frame (18). The semi-circular frame (18) is movably connected to the top of the inner wall of the protective frame (1) through the movable plate (12). The roller (14) is rotatably connected to the inner wall of the semi-circular frame (18) through a bearing. The coiling rod (13) is fixedly connected to the inner wall of the protective frame (1) through a bearing. A cleaning mechanism (16) is provided below the protective frame (1). The projection cloth (15) is placed inside the display rack (3). The surface of the coiling rod (13) is provided with a groove (20), the inside of the coiling rod (13) is provided with a triangular groove (21), the inside of the coiling rod (13) is provided with an arc groove (23), the triangular groove (21) and the arc groove (23) are connected to each other, a slider (22) is provided inside the triangular groove (21), and the bottom of the slider (22) is fixedly connected to the connecting block (24); The upper surface of the slider (22) is adapted to the inner wall of the triangular groove (21), and the lower surface of the slider (22) is adapted to the inner wall of the circular arc groove (23). The end of the arc groove (23) away from the triangular groove (21) passes through the surface of the coiling rod (13), and the connecting block (24) extends through the arc groove (23) to the outer end of the coiling rod (13). The connecting block (24) is fixedly connected to the projection cloth (15). The cleaning mechanism (16) includes an inclined plate (30), a sliding hole (31), a circular groove (32), a circular rod (33), a sliding block (34), and an arc scraper (35). The inclined plate (30) is fixedly connected to the inner wall of the protective frame (1). The circular rod (33) is fixedly connected to the inclined plate (30). A sliding hole (31) is provided at the center of the inside of the circular rod (33). A circular groove (32) is provided inside the circular rod (33). The sliding block (34) contacts the inner wall of the sliding hole (31). The arc scraper (35) is fixedly connected to the sliding block (34). The inclined plate (30) is set at an angle downwards; The circular groove (32) is connected to the interior of the sliding hole (31), the sliding hole (31) is T-shaped, and the sliding block (34) extends through the sliding hole (31) to the outer end of the circular rod (33).

2. The multimedia teaching device for mathematics teaching according to claim 1, characterized in that: The right end of the coiling rod (13) is fixedly connected to the output end of the motor (2), the roller (14) is in contact with the outer surface of the coiling rod (13), and two sets of cleaning mechanisms (16) are provided at the bottom of the protective frame (1).

3. The multimedia teaching device for mathematics teaching according to claim 1, characterized in that: Also includes: The base plate (5) is rectangular. The bottom of the base plate (5) is provided with casters (6). The top of the base plate (5) is fixedly connected with an electric push rod (4). The top left side of the base plate (5) is fixedly connected with a pull rod (7). The top of the electric push rod (4) is fixedly connected to the bottom of the display rack (3).

4. The multimedia teaching device for mathematics teaching according to claim 1, characterized in that: The two arc-shaped scrapers (35) are arranged vertically and are positioned correspondingly to each other. The arc-shaped scrapers (35) are in contact with the surface of the projection cloth (15).

5. A multimedia teaching device for mathematics teaching according to claim 1, characterized in that: The display rack (3) includes an arc hanging rod (40), an elastic plate (41), a round hole frame (42), a telescopic plate (43), a stop block (44), a rubber rod (45), and a multimedia projector (46). The arc hanging rod (40) is movably connected to the top of the protective frame (1) via a pivot. The telescopic plate (43) is fixedly connected to the top of the inner wall of the display rack (3) via a pivot. The stop block (44) is fixedly connected to the bottom of the inner wall of the display rack (3). The round hole frame (42) is fixedly connected to the surface of the telescopic plate (43). The rubber rod (45) is fixedly connected to the bottom of the projection cloth (15). The telescopic plate (43) and the protective frame (1) are fixedly connected by an elastic plate (41), and the multimedia projector (46) is fixedly connected to the inner wall of the telescopic plate (43).

6. A multimedia teaching device for mathematics teaching according to claim 5, characterized in that: The bottom surface of the telescopic plate (43) is in contact with the surface of the stop block (44), and the surface of the arc hanging rod (40) is adapted to the inner wall of the circular hole frame (42).

Images