Multi-purpose drawing device for mathematical teaching

Abstract

Disclosed is a multi-purpose drawing device for mathematical teaching. The multi-purpose drawing device comprises a drawing board (1), wherein cavities (2) are provided on the left and right sides of the interior of the drawing board; and elastic positioning columns (3) which slide through the cavities and are fixed by means of positioning mechanisms are provided on the left and right sides of the drawing board, wherein anti-slip rubber cones (4) are rotatably connected to the bottom ends of the elastic positioning columns, and arc-shaped pressing plates (5) are fixed to the top ends of the elastic positioning columns. A teacher can draw a standard straight line along the side wall of the drawing board close to a second scale line (11), and can also draw a standard circle by rotating the drawing board with the bottom end of the anti-slip rubber cone (4) as the circle center. In addition, a rotation adjustment mechanism drives a support shaft (13) on the inner side of a groove (12) to drive an angle-drawing scale (15) to rotate to the outside of the groove, such that a standard geometric angle can be drawn on a blackboard along the angle-drawing scale and the side wall of the rear side of the drawing board, thereby enabling the multi-purpose drawing device for mathematical teaching to simultaneously meet different drawing requirements during the mathematical teaching process.

Description

A multi-purpose drawing device for mathematics teaching Technical Field

[0001] This invention relates to the field of teaching aids technology, and in particular to a multi-purpose drawing device for mathematics teaching. Background Technology

[0002] Mathematics is a discipline that studies concepts such as quantity, structure, change, space, and information. Mathematics teaching refers to the process in which teachers impart mathematical knowledge, skills, and ideas to students through certain methods and means, and cultivate students' mathematical thinking ability, problem-solving ability, and interest and attitude towards mathematics. In the process of teaching mathematics, when teaching students geometry, teachers usually need to draw figures such as straight lines, circles, and squares on the blackboard to assist in teaching.

[0003] Currently, teachers generally need to use different drawing tools when drawing geometric figures, such as using a ruler to draw straight lines and a compass to draw circles. Although standard geometric figures can be drawn with the help of different drawing tools, switching back and forth between different drawing tools is time-consuming, laborious, and inconvenient, which reduces the drawing efficiency and teaching quality of teachers. Therefore, this invention proposes a multi-purpose drawing device for mathematics teaching to solve the problems existing in the prior art. Summary of the Invention

[0004] To address the aforementioned problems, the present invention aims to provide a multi-purpose drawing device for mathematics teaching, which solves the problem that in the current mathematics teaching process, teachers need to use different auxiliary drawing tools to draw different geometric figures in a standard manner, and the frequent switching of different auxiliary drawing tools will affect the drawing efficiency and teaching quality.

[0005] To achieve the objectives of this invention, the invention is implemented through the following technical solution: A multi-purpose drawing device for mathematics teaching, comprising a drawing board, wherein cavities are formed on both the left and right sides of the drawing board, and elastic positioning columns are provided on both the left and right sides of the drawing board, sliding through the cavities and fixed by a positioning mechanism. An anti-slip rubber cone is rotatably connected to the bottom end of each elastic positioning column, and an arc-shaped pressure plate is fixed to the top end of each elastic positioning column. A through groove corresponding to the position of the cavity is formed in the middle of the drawing board, and a sliding groove is provided inside the through groove, driven by a horizontal adjustment mechanism. A movable column has a drawing chalk fixed to its bottom end via an elastic snap-fit ​​mechanism, a diamond-shaped pointer fixed to its top end, a first scale line printed on the top end of the drawing board located on both sides of the diamond-shaped pointer, a second scale line printed on the front side of the top end of the drawing board, symmetrical grooves on the rear side of the drawing board, a support shaft rotatably connected to the inner side of the grooves via a rotation adjustment mechanism, a connecting plate sleeved on the support shaft, a drawing angle scale fixed to the end of the connecting plate away from the support shaft, and a protractor slidably connected to the rear side of the top end of the drawing board.

[0006] A further improvement is that: a connecting block is symmetrically fixed to the front side wall of the protractor, a T-shaped slider is fixed to the bottom end of the connecting block, and a T-shaped slide rail adapted to the T-shaped slider is provided at the top of the drawing board.

[0007] A further improvement is that the rotary adjustment mechanism includes a drive cavity opened on the front side of the groove and a first lead screw rotatably connected in the drive cavity. A threaded block is threaded onto the first lead screw, and a rack is fixed at one end of the threaded block near the support shaft. A rotating gear meshing with the rack is sleeved on the support shaft. The opposite ends of the two sets of first lead screws pass through bearings to the outside of the drawing board and are fixed with first knobs.

[0008] A further improvement is that a baffle is sleeved on the elastic positioning post, and a first limiting spring is fixed to the top of the baffle and sleeved outside the elastic positioning post. The top of the first limiting spring is fixed to the top of the cavity.

[0009] A further improvement is that the positioning mechanism includes positioning bolts threaded through both sides of the drawing board and positioning grooves formed on the sidewalls of the elastic positioning column, wherein the positioning grooves are adapted to the positioning bolts.

[0010] A further improvement is that the horizontal adjustment mechanism includes a second knob and a second lead screw rotatably connected inside the through groove. The bottom end of the second knob is fixed with a rotating shaft. The bottom end of the rotating shaft passes through the drawing board via a bearing and is fixed with a first bevel gear. The end of the second lead screw near the first bevel gear is fixed with a second bevel gear that meshes with the first bevel gear.

[0011] A further improvement is that the elastic snap-fit ​​mechanism includes a circular groove at the bottom of the movable column and a second limiting spring fixed at the top of the circular groove. The bottom of the second limiting spring is fixed with a snap-fit ​​sleeve that is slidably connected to the inside of the circular groove. An elastic rubber sleeve is fixed to the inner wall of the snap-fit ​​sleeve, and the upper part of the drawing chalk is interference-fitted into the elastic rubber sleeve.

[0012] Further improvements include: symmetrical storage slots are provided on the front side of the drawing board, a chalk storage box is slidably connected inside the storage slots, rotating blocks are symmetrically distributed on the front side of the drawing board, a limit block is connected to the side of the rotating block near the chalk storage box by a third limit spring, an anti-slip rubber pad is fixed on the bottom surface of the drawing board, and a level is fitted and fixed on the top of the drawing board.

[0013] The beneficial effects of this invention are as follows: By attaching a square drawing board to the surface of a blackboard, the teacher can draw a standard straight line along the side of the drawing board near the second scale line. Furthermore, by clamping drawing chalk at the bottom of a movable column and rotating the drawing board with the anti-slip rubber cone at the bottom as the center, the teacher can draw a standard circle on the blackboard. Additionally, by using a rotation adjustment mechanism to drive the support shaft inside the groove to rotate the angle scale to the outside of the groove until an angle is formed between the angle scale and the rear sidewall of the drawing board, the teacher can draw a standard geometric angle on the blackboard along the angle scale and the rear sidewall of the drawing board. Therefore, this multi-purpose drawing device for mathematics teaching can simultaneously meet different drawing requirements in the mathematics teaching process without the need for the teacher to frequently switch between different drawing tools, thereby improving the teacher's drawing efficiency and bringing convenience to the teacher's mathematics teaching work. Attached Figure Description

[0014] Figure 1 is a top view of the present invention;

[0015] Figure 2 is a top sectional view of the present invention;

[0016] Figure 3 is an enlarged view of point A in Figure 2 of the present invention;

[0017] Figure 4 is an enlarged view of section B in Figure 2 of the present invention;

[0018] Figure 5 is an enlarged view of point C in Figure 2 of the present invention;

[0019] Figure 6 is a front sectional view of the present invention;

[0020] Figure 7 is an enlarged view of point D in Figure 6 of the present invention;

[0021] Figure 8 is a rear view of the present invention;

[0022] Figure 9 is a cross-sectional view of the movable column and snap-fit ​​sleeve of the present invention;

[0023] Figure 10 is a schematic diagram of the three-dimensional structure of the protractor of the present invention.

[0024] The components include: 1. Drawing board; 2. Cavity; 3. Elastic positioning post; 4. Anti-slip rubber cone; 5. Arc-shaped pressure plate; 6. Through groove; 7. Moving post; 8. Drawing chalk; 9. Diamond-shaped pointer; 10. First scale line; 11. Second scale line; 12. Groove; 13. Support shaft; 14. Connecting plate; 15. Angle ruler; 16. Protractor; 17. Connecting block; 18. T-shaped slider; 19. T-shaped slide rail; 20. Drive cavity; 21. First lead screw; 22. Threaded block; 23. Rack; 24. Rotation. 25. Gear; 26. First knob; 27. Baffle; 28. First limit spring; 29. ​​Positioning bolt; 30. Positioning groove; 31. Second knob; 32. Second lead screw; 33. Rotating shaft; 34. First bevel gear; 35. Second bevel gear; 36. Circular groove; 37. Second limit spring; 38. Snap-fit ​​sleeve; 39. Elastic rubber sleeve; 40. Storage groove; 41. Chalk storage box; 42. Rotating block; 43. Third limit spring; 44. Limiting block; 45. Anti-slip rubber pad; 46. Level. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Mathematics is a universal means by which humans rigorously describe and deduce the abstract structures and patterns of things. Mathematics teaching refers to the process in which teachers, through certain methods and means, impart mathematical knowledge, skills, and ideas to students, cultivate students' mathematical thinking ability, problem-solving ability, and interest and attitude towards mathematics. There are many mathematical teaching strategies. Among them, the intuitive teaching strategy uses concrete images, objects, or multimedia tools to demonstrate mathematical concepts, formulas, and principles, helping students to establish intuitive understanding. The heuristic teaching method focuses on cultivating students' logical thinking ability and self-learning ability, stimulating students' desire for knowledge by posing questions and guiding discussions. The practical application strategy emphasizes the practical application of mathematical knowledge, designs mathematical problems with real-world backgrounds, and guides students to use their learned knowledge to solve practical problems.

[0027] In the process of mathematics teaching, teachers generally need to use a variety of different drawing tools when drawing geometric figures, which brings inconvenience to their mathematics teaching work.

[0028] To address the problems existing in the prior art, referring to Figures 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10, this embodiment provides a multi-purpose drawing device for mathematics teaching, including a square drawing board 1 and cavities 2 formed on the left and right sides inside the drawing board 1. Elastic positioning posts 3 are provided on both sides of the drawing board 1, and the elastic positioning posts 3 slide through the drawing board 1 and the cavities 2 and are fixed by a positioning mechanism, making it easy to position and fix the elastic positioning posts 3 after being pressed. The bottom end of the elastic positioning post 3 is rotatably connected to an anti-slip rubber cone 4 via a bearing, allowing the drawing board 1 and the elastic positioning post 3 to rotate relative to the anti-slip rubber cone 4. The top end of the elastic positioning post 3 is connected by a screw... An arc-shaped pressure plate 5 is fixed in place, facilitating the teacher's pressing of the elastic positioning column 3 to lower it. A through groove 6, connecting the upper and lower parts, is located in the middle of the drawing board 1, between two sets of cavities 2 and corresponding to their positions. A movable column 7 is slidably mounted inside the through groove 6, driven by a horizontal adjustment mechanism for left and right lateral displacement. A drawing chalk 8 for drawing on the blackboard is fixed to the bottom of the movable column 7 via an elastic snap-fit ​​mechanism. A diamond-shaped pointer 9 is fixed to the top of the movable column 7 by bolts. A first scale line 10 is printed on the top of the drawing board 1, with two sets of the first scale line 10 located on the front and rear sides of the diamond-shaped pointer 9, respectively. The diamond-shaped pointer 9 and the first scale line 10 facilitate the teacher's... Knowing the moving distance of the movable column 7, a second scale line 11 is printed on the front top of the drawing board 1 to facilitate teachers in confirming the drawing length when drawing straight lines. The rear side of the drawing board 1 has symmetrically distributed grooves 12. Each set of grooves 12 has a support shaft 13 rotatably connected to its opposite side via bearings. The support shaft 13 is driven and rotated via a rotation adjustment mechanism. A connecting plate 14 is fixedly fitted onto the support shaft 13. A drawing angle scale 15 with its own scale lines is welded and fixed to the end of the connecting plate 14 away from the support shaft 13. A protractor 16 for measuring the angle between the drawing angle scale 15 and the drawing board 1 is slidably connected to the rear top of the drawing board 1. This is achieved by attaching the square drawing board 1 to the black... The drawing board surface allows teachers to draw standard straight lines along the side of the drawing board 1 near the second scale line 11. By clamping drawing chalk 8 at the bottom of the movable column 7 and rotating the drawing board 1 with the anti-slip rubber cone 4 at the bottom of the anti-slip rubber cone 4 as the center, teachers can draw standard circles on the blackboard. In addition, by driving the support shaft 13 inside the groove 12 through the rotation adjustment mechanism, the angle scale 15 is rotated to the outside of the groove 12 until the angle scale 15 and the rear side wall of the drawing board 1 form an angle, allowing teachers to draw standard geometric angles on the blackboard along the angle scale 15 and the rear side wall of the drawing board 1. Thus, this drawing device is a multi-purpose integrated design that can draw different graphics.

[0029] The front side wall of the protractor 16 is fixed with connecting blocks 17 that are symmetrically distributed on the left and right sides by bolts. The bottom end of the connecting block 17 is fixed with a T-shaped slider 18 by bolts. A T-shaped slide rail 19 is provided on the rear side of the top of the drawing board 1. The T-shaped slide rail 19 is adapted to the T-shaped slider 18. The T-shaped slider 18 is slidably connected in the T-shaped slide rail 19 to realize the lateral sliding adjustment of the protractor 16, which is convenient for measuring the included angle at different positions.

[0030] The rotary adjustment mechanism includes a drive cavity 20 and a first lead screw 21. The drive cavity 20 has two sets of screws, each located in front of a groove 12. The first lead screw 21 is rotatably connected to the drive cavity 20 via a bearing. A threaded block 22 is threaded onto the first lead screw 21, and the threaded block 22 slides against the inner wall of the drive cavity 20. A rack 23 is bolted to one end of the threaded block 22 near the support shaft 13. A rotating gear 24 is sleeved on the support shaft 13, and the rotating gear 24 meshes with the rack 23. The opposite ends of the two sets of first lead screws 21 extend through bearings to the outside of the drawing board 1 and are bolted to a first knob 25. Rotating the first knob 25 drives the first lead screw 21 to rotate, causing the threaded block 22 threaded onto the first lead screw 21 to move laterally. During the lateral movement of the threaded block 22, the rack 23 is moved, which in turn drives the rotating gear 24 to rotate, and the rotating gear 24 then drives the support shaft 13 to rotate.

[0031] A baffle 26 is sleeved on one side of the elastic positioning post 3 inside the cavity 2. A first limiting spring 27 is fixed to the top of the baffle 26. The first limiting spring 27 is movably sleeved on the outside of the elastic positioning post 3. The top of the first limiting spring 27 is fixed to the top of the inside of the cavity 2. The first limiting spring 27 provides elastic contraction force to the baffle 26, thereby enabling the elastic positioning post 3 to have an automatic rebound and reset function, preventing the elastic positioning post 3 from obstructing the drawing board 1 from adhering to the blackboard surface.

[0032] The positioning mechanism includes positioning bolts 28 and positioning grooves 29. The positioning bolts 28 are provided in two sets and are threaded through the left and right side walls of the drawing board 1 respectively. The positioning grooves 29 are opened on the side wall of the elastic positioning post 3 and are adapted to the positioning bolts 28. By screwing the positioning bolts 28 into the positioning grooves 29, the elastic positioning post 3 is positioned and fixed so that it will not spring back to its original position.

[0033] The lateral adjustment mechanism includes a second knob 30 and a second lead screw 31. The second lead screw 31 is rotatably connected to the inside of the through groove 6 via a bearing. The bottom end of the second knob 30 is fixed with a rotating shaft 32 by bolts. The bottom end of the rotating shaft 32 passes through the drawing board 1 via a bearing and is fixed with a first bevel gear 33. A second bevel gear 34 is fixed at the end of the second lead screw 31 near the first bevel gear 33. The second bevel gear 34 meshes with the first bevel gear 33. By rotating the second knob 30, the rotating shaft 32 is driven to rotate the first bevel gear 33. The first bevel gear 33 drives the meshing second bevel gear 34 to rotate. The second bevel gear 34 then drives the second lead screw 31 to rotate, thereby causing the moving column 7 threaded on the second lead screw 31 to move laterally.

[0034] The elastic snap-fit ​​mechanism includes a circular groove 35 and a second limiting spring 36. The circular groove 35 is located at the bottom of the moving column 7. The second limiting spring 36 is fixed to the top of the inside of the circular groove 35. A snap-fit ​​sleeve 37 is fixed to the bottom of the second limiting spring 36. The snap-fit ​​sleeve 37 is slidably connected inside the circular groove 35. An elastic rubber sleeve 38 is fixed to the inner wall of the snap-fit ​​sleeve 37. The upper part of the drawing chalk 8 is interference-fitted into the elastic rubber sleeve 38. By interfering with the inner side of the elastic rubber sleeve 38, the drawing chalk 8 is clamped. At the same time, the second limiting spring 36 provides an elastic push-out force for the snap-fit ​​sleeve 37 and the drawing chalk 8. When the drawing board 1 is attached to the blackboard, the drawing chalk 8 can contact the surface of the blackboard, so that when the drawing board 1 is rotated, the drawing chalk 8 can draw a circle on the surface of the blackboard.

[0035] The front side of the drawing board 1 has two sets of symmetrically distributed storage slots 39. A chalk storage box 40 for storing drawing chalk is slidably connected inside the storage slots 39. The left and right sides of the front side wall of the drawing board 1 are rotatably connected to rotating blocks 41 via bearings. A third limiting spring 42 is fixed on the rear side wall of the rotating block 41 near the chalk storage box 40. A limiting block 43 is fixedly connected to the end of the third limiting spring 42 away from the rotating block 41. The third limiting spring 42 provides an elastic pushing force to the limiting block 43, thereby limiting and blocking the chalk storage box 40 and preventing it from falling out. An anti-slip rubber pad 44 is fixed on the bottom surface of the drawing board 1 to prevent slippage between the drawing board 1 and the blackboard. A level 45 is fitted and fixed at the top of the drawing board 1 to facilitate control of the levelness of the drawing board 1.

[0036] When a teacher needs to draw a straight line pattern during a math lesson, the teacher first places the bottom of drawing board 1 against the blackboard surface and makes drawing board 1 horizontal. Then, the teacher uses their other hand to hold chalk and draw a line along the side wall of drawing board 1 near the second scale line 11, thus drawing a standard horizontal straight line. Next, the teacher places drawing board 1 against the blackboard surface and makes drawing board 1 vertical. Then, the teacher uses their other hand to hold chalk and draw a line along the side wall of drawing board 1 near the second scale line 11, thus drawing a standard vertical straight line.

[0037] When a teacher needs to draw a circular pattern during a math lesson, first, the drawing chalk 8 is clamped at the bottom of the movable column 7. Then, the right elastic positioning column 3 is pressed down until the right anti-slip rubber cone 4 extends to the bottom of the drawing board 1. The positioning mechanism is used to lock and fix the elastic positioning column 3. Next, the horizontal adjustment mechanism is used to drive the movable column 7 to move laterally along the through groove 6. The drawing chalk 8 clamped at the bottom of the movable column 7 is moved to the appropriate position according to the diameter of the circle to be drawn (the distance between the drawing chalk 8 and the right elastic positioning column 3 is the radius of the circle to be drawn). Then, the teacher places the bottom surface of the drawing board 1 against the blackboard surface and presses the arc-shaped pressure plate 5 to make the right anti-slip rubber cone 4 contact the blackboard surface. Then, the drawing board 1 is rotated with the right anti-slip rubber cone 4 as the center, and the drawing chalk 8 is used to draw a standard circle.

[0038] When a teacher needs to draw geometric angles during a math lesson, the teacher first places the bottom of the drawing board 1 against the blackboard surface and keeps the drawing board 1 horizontal. Then, the teacher uses a rotation adjustment mechanism to drive the support shaft 13 inside the groove 12 to rotate the angle ruler 15 to the outside of the groove 12, so that the angle ruler 15 and the rear side wall of the drawing board 1 form an angle (the angle value is measured using a horizontally adjustable protractor 16). Then, the teacher takes a piece of chalk and slides it along the angle ruler 15 and the rear side wall of the drawing board 1 on the blackboard to draw a standard geometric angle.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-purpose drawing device for mathematics teaching, comprising a drawing board (1), characterized in that: The drawing board (1) has cavities (2) on both the left and right sides. Each side of the drawing board (1) has an elastic positioning column (3) that slides through the cavity (2) and is fixed by a positioning mechanism. The bottom of the elastic positioning column (3) is rotatably connected to an anti-slip rubber cone (4). An arc-shaped pressure plate (5) is fixed to the top of the elastic positioning column (3). A through groove (6) corresponding to the position of the cavity (2) is opened in the middle of the drawing board (1). A moving column (7) that is driven by a horizontal adjustment mechanism is slidably arranged inside the through groove (6). A drawing chalk (8) is fixed to the bottom of the moving column (7) by an elastic snap-fit ​​mechanism. (7) A diamond-shaped pointer (9) is fixed at the top. The top of the drawing board (1) is printed with first scale lines (10) located on the front and back sides of the diamond-shaped pointer (9). The front side of the top of the drawing board (1) is printed with second scale lines (11). The back side of the drawing board (1) is symmetrically provided with grooves (12). The inside of the grooves (12) is rotatably connected to a support shaft (13) driven to rotate by a rotation adjustment mechanism. A connecting plate (14) is sleeved on the support shaft (13). A drawing angle scale ruler (15) is fixed at one end of the connecting plate (14) away from the support shaft (13). A protractor (16) is slidably connected to the back side of the top of the drawing board (1).

2. The multi-purpose drawing device for mathematics teaching according to claim 1, characterized in that: The protractor (16) has a connecting block (17) symmetrically fixed on its front side wall. The bottom of the connecting block (17) is fixed with a T-shaped slider (18). The top of the drawing board (1) is provided with a T-shaped slide rail (19) that is compatible with the T-shaped slider (18).

3. The multi-purpose drawing device for mathematics teaching according to claim 1, characterized in that: The rotation adjustment mechanism includes a drive cavity (20) opened on the front side of the groove (12) and a first lead screw (21) rotatably connected in the drive cavity (20). A threaded block (22) is threaded on the first lead screw (21). A rack (23) is fixed at one end of the threaded block (22) near the support shaft (13). A rotating gear (24) meshing with the rack (23) is sleeved on the support shaft (13). The opposite ends of the two sets of first lead screws (21) are both extended through bearings to the outside of the drawing board (1) and fixed with a first knob (25).

4. The multi-purpose drawing device for mathematics teaching according to claim 1, characterized in that: A baffle plate (26) is sleeved on the elastic positioning post (3). A first limiting spring (27) is fixed at the top of the baffle plate (26) and sleeved outside the elastic positioning post (3). The top of the first limiting spring (27) is fixed inside the cavity (2).

5. A multi-purpose drawing device for mathematics teaching according to claim 1, characterized in that: The positioning mechanism includes positioning bolts (28) threaded through both sides of the drawing board (1) and positioning grooves (29) opened on the side wall of the elastic positioning column (3), wherein the positioning grooves (29) are adapted to the positioning bolts (28).

6. A multi-purpose drawing device for mathematics teaching according to claim 1, characterized in that: The horizontal adjustment mechanism includes a second knob (30) and a second lead screw (31) rotatably connected inside the through groove (6). The bottom end of the second knob (30) is fixed with a rotating shaft (32). The bottom end of the rotating shaft (32) passes through the drawing board (1) through a bearing and is fixed with a first bevel gear (33). The end of the second lead screw (31) near the first bevel gear (33) is fixed with a second bevel gear (34) that meshes with the first bevel gear (33).

7. A multi-purpose drawing device for mathematics teaching according to claim 1, characterized in that: The elastic snap-fit ​​mechanism includes a circular groove (35) at the bottom of the movable column (7) and a second limiting spring (36) fixed inside the top of the circular groove (35). The bottom of the second limiting spring (36) is fixed with a snap-fit ​​sleeve (37) that is slidably connected inside the circular groove (35). An elastic rubber sleeve (38) is fixed on the inner wall of the snap-fit ​​sleeve (37). The upper part of the drawing chalk (8) is interference-fitted into the elastic rubber sleeve (38).

8. A multi-purpose drawing device for mathematics teaching according to claim 1, characterized in that: The drawing board (1) has symmetrically provided storage slots (39) on the front side. A chalk storage box (40) is slidably connected inside the storage slots (39). A rotating block (41) is rotatably connected to the front side of the drawing board (1) and is symmetrically distributed on the left and right sides. A limit block (43) is connected to the side of the rotating block (41) near the chalk storage box (40) through a third limit spring (42). An anti-slip rubber pad (44) is fixed on the bottom surface of the drawing board (1). A level (45) is fitted and fixed on the top of the drawing board (1).

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