阅读说明：本技术 一种数学教学绘图装置 (Drawing device for mathematical teaching ) 是由 张凤玲 于 2020-06-05 设计创作，主要内容包括：本发明属于教学演示装置技术领域,具体涉及一种数学教学绘图装置,包括安装筒、丝杆、定位杆、上安装板和下安装板,所述安装筒和丝杆转动安装在上安装板和下安装板之间,所述定位杆固定安装在上安装板和下安装板之间,所述安装筒、丝杆和定位杆相互平行,所述安装筒和丝杆之间安装有第一传动机构,所述安装筒上可拆卸安装有塑料薄膜,所述塑料薄膜展开呈矩形,所述丝杆上螺接有升降块,所述升降块上开设有定位孔,所述升降块通过定位孔滑动套设在定位杆上,所述升降块上安装有画笔,所述画笔的笔尖顶靠在塑料薄膜上。其目的是：解决现有螺旋线绘制教学效果不理想的问题。(The invention belongs to the technical field of teaching demonstration devices, and particularly relates to a mathematical teaching drawing device which comprises an installation barrel, a screw rod, a positioning rod, an upper installation plate and a lower installation plate, wherein the installation barrel and the screw rod are rotatably installed between the upper installation plate and the lower installation plate, the positioning rod is fixedly installed between the upper installation plate and the lower installation plate, the installation barrel, the screw rod and the positioning rod are parallel to each other, a first transmission mechanism is installed between the installation barrel and the screw rod, a plastic film is detachably installed on the installation barrel, the plastic film is unfolded to be rectangular, a lifting block is screwed on the screw rod, a positioning hole is formed in the lifting block, the lifting block is slidably sleeved on the positioning rod through the positioning hole, a painting brush is installed on the lifting block, and the pen point of the painting brush. The purpose is as follows: the problem of the teaching effect is unsatisfactory is drawn to current helix is solved.)

1. The utility model provides a mathematical education drawing device which characterized in that: comprises an installation barrel (1), a screw rod (2), a positioning rod (3), an upper installation plate (31) and a lower installation plate (32), wherein the installation barrel (1) and the screw rod (2) are rotatably installed between the upper installation plate (31) and the lower installation plate (32), the positioning rod (3) is fixedly installed between the upper installation plate (31) and the lower installation plate (32), the installation barrel (1), the screw rod (2) and the positioning rod (3) are parallel to each other, a first transmission mechanism is installed between the installation barrel (1) and the screw rod (2), a plastic film (10) is detachably installed on the installation barrel (1), the plastic film (10) is unfolded to be rectangular, a lifting block (21) is screwed on the screw rod (2), a positioning hole (211) is formed on the lifting block (21), and the lifting block (21) is slidably sleeved on the positioning rod (3) through the positioning hole (211), a painting brush (20) is mounted on the lifting block (21), and the pen point of the painting brush (20) abuts against the plastic film (10).

2. The mathematical education drafting apparatus as claimed in claim 1, wherein: first drive mechanism includes drive belt (11), action wheel and follows the driving wheel, the drive belt is around establishing at the action wheel and from the driving wheel on, mounting cylinder (1) lower extreme passes down mounting panel (32) integrated into one piece and has first installation axle (12), install on first installation axle (12) from the driving wheel, mounting panel (32) integrated into one piece has second installation axle (22) down passed to lead screw (2) lower extreme, the action wheel is installed on second installation axle (22).

3. The mathematical education drafting apparatus as claimed in claim 2, wherein: the driven wheel includes two first activity dish (13), first activity dish (13) inner wall integrated into one piece has first bead, first bar groove (120) have been seted up to first installation axle (12) outer wall axial, first bead is located first bar groove (120), first activity dish (13) can be followed the axial of first installation axle (12) and moved, the action wheel includes two second activity dish (23), second activity dish (23) inner wall integrated into one piece has the second bead, second bar groove (220) have been seted up to second installation axle (22) outer wall axial, the second bead is located second bar groove (220), the axial that second activity dish (23) can follow second activity dish (22) is removed, first activity dish (23) and second activity dish (13) all are the toper installation axle.

4. A mathematical education drafting apparatus as claimed in claim 3, wherein: a support frame (4) is arranged below the lower mounting plate (32), the first transmission mechanism is rotatably arranged between the lower mounting plate (32) and the support frame (4), a rotating shaft (5) is also rotatably arranged between the lower mounting plate (32) and the support frame (4), the two ends of the rotating shaft (5) are respectively and fixedly provided with a threaded rod (51), the rotating directions of the threads of the threaded rods (51) at the two ends of the same rotating shaft (5) are opposite, each threaded rod (51) is screwed with an adjusting block (52), the adjusting block (52) at one side of the first movable disc (13) is rotationally connected with the first movable disc (13), the adjusting block (52) on one side of the second movable disc (23) is rotatably connected with the second movable disc (23), a second transmission mechanism is further installed between the rotating shafts (5), and the rotating directions of the rotating shafts (5) are opposite.

5. The mathematical education drafting apparatus as claimed in claim 4, wherein: support frame (4) below fixed mounting has bottom plate (6), second drive mechanism installs between support frame (4) and bottom plate (6), second drive mechanism is including first gear (61), second gear (62), third gear (63) and fourth gear (64) that mesh in proper order, two axis of rotation (5) lower extreme passes support frame (4) integrated into one piece and has third installation axle (610), first gear (61) and fourth gear (64) fixed mounting are on corresponding third installation axle (610), the number of teeth of first gear (61) and fourth gear (64) equals, second gear (62) and third gear (63) rotate to be installed between support frame (4) and bottom plate (6).

6. The mathematical education drafting apparatus as claimed in claim 5, wherein: a rotating shaft (650) is further rotatably installed between the supporting frame (4) and the bottom plate (6), a fifth gear (65) is fixedly installed on the rotating shaft (650), the fifth gear (65) is meshed with the fourth gear (64), and a crank (651) is fixedly installed above the supporting frame (4) on the rotating shaft (650).

7. The mathematical education drafting apparatus as claimed in claim 1, wherein: the upper end of the screw rod (2) penetrates through the upper mounting plate (31) and is also fixedly provided with a crank (651).

8. The mathematical education drafting apparatus as claimed in claim 1, wherein: the plastic film is characterized in that clamping rods (101) are fixedly mounted at two ends of the plastic film (10), a notch (102) is axially formed in the outer wall of the mounting cylinder (1), the notch (102) penetrates through the mounting cylinder (1), a clamping groove (103) and a placing groove (104) are vertically formed in the notch (102) of the mounting cylinder (1), one clamping rod (101) penetrates through the clamping groove (103), a positioning plate (105) is fixedly mounted at the bottom of the mounting cylinder (1), a first through hole (106) is formed in the positioning plate (104) at the bottom of the clamping groove (103), the lower end of the clamping rod (101) penetrating through the clamping groove (103) penetrates through the first through hole (106), a second through hole (107) is formed in the positioning plate (104) at the bottom of the placing groove (104), the other clamping rod (101) is located in the placing groove (104), and the lower end of the clamping rod (101) located in the placing groove (104) penetrates through the second through hole (107), the clamping rod (101) is located in the placing groove (104), a connecting block (108) is fixedly mounted at the upper end of the clamping rod, a through hole is formed in the connecting block (108), a fixing bolt (1010) penetrates through the through hole, a threaded hole (109) is further formed in the mounting cylinder (1), and the fixing bolt (1010) is in threaded connection with the threaded hole (109).

9. The mathematical education drafting apparatus as claimed in claim 1, wherein: lifting block (21) lateral wall fixed mounting has fixed cover (201), painting brush (20) are worn to establish in fixed cover (201), fixed cover (201) inner wall is close to installation section of thick bamboo (1) one end fixed mounting and is kept off the ring, painting brush (20) are kept away from installation section of thick bamboo (1) one end fixed mounting and are had clamping ring (202), painting brush (20) are equipped with compression spring (203) in keeping off the cover between ring and clamping ring (202), fixed cover (201) are kept away from installation section of thick bamboo (1) one end inner wall and are seted up internal thread (204), fixed cover (201) have kicking block (205) through internal thread (204) spiro union.

Technical Field

The invention belongs to the technical field of teaching demonstration devices, and particularly relates to a mathematical teaching drawing device.

Background

The demonstration method is a teaching method commonly used in the subjects of physics, chemistry and the like, and for mathematical teaching, the demonstration method is less in use and generally not very important. However, with the development of new lessons, teachers feel that the demonstration method is more and more important, and the effect of getting double results with half the effort can be achieved in many mathematical education. The demonstration methods are intuitive, can enable students to obtain perceptual knowledge in observation, enrich direct experience, and lay a good foundation for learning new knowledge, forming new concepts. For example, when teaching the interior angles and theorem of a triangle, a teacher may manually cut a triangle from cardboard and then put the three corners together. Through simple demonstration experiments, it is better for students to know that the sum of the internal angles of the triangle is 180 °, and why these degrees.

The demonstration method also conforms to the age characteristics and thinking development rules of students. The development of student thinking always starts from concrete and image thinking and then to abstract and logical thinking. The demonstration method always provides concrete and visual images for students, so that the students can conveniently accept and master the demonstration method. For example, when the stability of a triangle and the instability of a quadrangle are taught, the triangle and the quadrangle can be defined by three or four battens respectively, and the three battens and the quadrangle are pulled by hands, so that students can see the triangle with their eyes without changing the shape, but the quadrangle can be changed at will, and the stability of the triangle and the instability of the quadrangle can be obtained.

The teaching demonstration tool has more intuitive, vivid and specific characteristics, is helpful for students to form and become familiar with the concept and conclusion of mathematics, and deepens the understanding and mastering of knowledge. It conforms to the cognitive rule from vivid intuition to abstract thinking and then from abstract thinking to practice.

The common mathematical concept in cylindrical helix geometry is that the moving point rotates one revolution, and its height along the axial direction is called the lead and is denoted by S. When the moving point spirals around the shaft by an angle of 2 pi/n, the distance of rising along the shaft is S/n. When a teacher explains the spiral line, the spiral line is drawn manually, and the graph drawn in the mode is not standard. In recent years, in order to achieve a specific teaching target, teachers demonstrate spiral line drawing processes by using teaching media such as teaching aids (objects, samples, models, pictures or wall drawings), audio and video data (slides, projections, videos, movies, televisions, DVDs and the like) courseware and the like, but the models, the pictures and the like are fixed and cannot demonstrate the drawing processes, the audio and video data cannot enable students to participate in the drawing processes, and the teaching effect is not ideal.

Disclosure of Invention

The purpose of the invention is: the drawing device is used for solving the problem that the teaching effect of the existing spiral line drawing is not ideal.

In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:

the utility model provides a mathematical education drawing device, includes an installation section of thick bamboo, lead screw, locating lever, goes up mounting panel and lower mounting panel, an installation section of thick bamboo and lead screw rotate to be installed at last mounting panel under and between the mounting panel, locating lever fixed mounting is between last mounting panel under and the mounting panel, an installation section of thick bamboo, lead screw and locating lever are parallel to each other, install a drive mechanism between an installation section of thick bamboo and the lead screw, demountable installation has plastic film on the installation section of thick bamboo, plastic film expandes to be the rectangle, the spiro union has the elevator on the lead screw, the locating hole has been seted up on the elevator, the elevator passes through locating hole sliding sleeve and establishes on the locating lever, install the painting brush on the elevator, the nib top of.

Further inject, first drive mechanism includes drive belt, action wheel and follows the driving wheel, the drive belt is around establishing at the action wheel and from the driving wheel on, the installation section of thick bamboo lower extreme passes down mounting panel integrated into one piece and has first installation axle, install on first installation axle from the driving wheel, the lead screw lower extreme passes down mounting panel integrated into one piece and has the second installation axle, the action wheel is installed on the second installation axle. Through the structural design, the installation cylinder and the screw rod are mutually matched through the transmission belt, the driving wheel and the driven wheel to realize transmission connection, the structure is simple, and the installation is convenient.

Further inject, follow the driving wheel and include two first activity dishes, first activity dish inner wall integrated into one piece has first bead, first bar groove has been seted up to first installation axle outer wall axial, first bead is located first bar inslot, first activity dish can be followed the axial of first installation axle and removed, the action wheel includes two second activity dishes, second activity dish inner wall integrated into one piece has the second bead, second bar groove has been seted up to second installation axle outer wall axial, the second bead is located second bar inslot, the second activity dish can be followed the axial of second installation axle and removed, first activity dish and second activity dish all are the toper. Such structural design through being conical first activity dish and second activity dish cooperation drive belt, forms a infinitely variable mechanism for drive ratio between installation section of thick bamboo and the lead screw can carry out infinitely variable control in certain extent, thereby changes wantonly the helical pitch S of the lines that the painting brush was drawn on plastic film, improves the teaching effect.

Further inject, the mounting panel below still is equipped with the support frame down, first drive mechanism rotates and installs under between mounting panel and the support frame, still rotate between mounting panel and the support frame and install the axis of rotation down, each fixed mounting in axis of rotation both ends has a threaded rod, same root the spiral of the screw thread at axis of rotation both ends is opposite, every equal spiro union has a regulating block on the threaded rod, the regulating block and the first activity dish of first activity dish one side rotate to be connected, the regulating block and the second activity dish of second activity dish one side rotate to be connected, two still install second drive mechanism, two between the axis of rotation the rotation opposite direction of axis of rotation. Such structural design, when one of them axis of rotation rotates, can drive another axis of rotation through second drive mechanism and do synchronous revolution with opposite direction, thereby make two regulating blocks on same root axis of rotation do and leave mutually or move in opposite directions, and two regulating blocks on another axis of rotation do opposite movement, and then drive first movable disc and the motion of second movable disc, when two first movable discs were to leave mutually the motion promptly, two second movable discs were to move in opposite directions, thereby reach the purpose of adjusting the drive ratio between installation section of thick bamboo and the lead screw.

Further inject, support frame below fixed mounting has the bottom plate, second drive mechanism installs between support frame and bottom plate, second drive mechanism is including first gear, second gear, third gear and the fourth gear of meshing in proper order, two the axis of rotation lower extreme passes support frame integrated into one piece and has the third installation axle, first gear and fourth gear fixed mounting are on the third installation axle that corresponds, the number of teeth of first gear and fourth gear equals, second gear and third gear rotate to install between support frame and bottom plate. By the structural design, the transmission connection between the first gear and the fourth gear is completed through the second gear and the third gear, namely the transmission connection between the two rotating shafts is completed, and the effect that the rotating directions of the two rotating shafts are opposite is achieved; meanwhile, the number of teeth of the first gear is equal to that of the fourth gear, so that the rotating speeds of the two rotating shafts are ensured to be the same.

Further inject, still rotate between support frame and the bottom plate and install the rotation axis, fixed mounting has the fifth gear on the rotation axis, fifth gear and fourth gear engagement, the rotation axis is in support frame top fixed mounting has the crank. Due to the structural design, the fifth gear is rotated through the crank, so that the rest gears are driven to rotate, the transmission ratio between the barrel and the screw rod is changed, and the operation is more labor-saving; the fifth gear is used for pulling the distance between the crank and the rotating shaft, the mounting barrel, the screw rod and the positioning rod open, so that the crank can rotate more conveniently.

Further limit, the upper end of the screw rod penetrates through the upper mounting plate and is also fixedly provided with a crank. Such structural design rotates the lead screw through the crank, and then drives the painting brush upward movement, drives the installation section of thick bamboo simultaneously and rotates, operates more laborsavingly.

Further limiting, both ends of the plastic film are fixedly provided with clamping rods, the outer wall of the mounting cylinder is axially provided with a notch which penetrates through the mounting cylinder, the mounting cylinder is vertically provided with a clamping groove and a placing groove in the notch, one clamping rod penetrates through the clamping groove, the bottom of the mounting cylinder is fixedly provided with a positioning plate, the positioning plate is provided with a first through hole at the bottom of the clamping groove, the lower end of the clamping rod penetrating through the clamping groove is arranged in the first through hole, the positioning plate is provided with a second through hole at the bottom of the placing groove, the other clamping rod is positioned in the placing groove, the lower end of the clamping rod positioned in the placing groove penetrates through the second through hole, the upper end of the clamping rod positioned in the placing groove is fixedly provided with a connecting block, the connecting block is provided with a through hole, a fixing bolt penetrates through the through hole, and the mounting cylinder is also provided, the fixing bolt is screwed in the threaded hole. Such structural design, when installing plastic film on the installation section of thick bamboo, can wear to establish the draw-in groove earlier the kelly from the top down of not installing the connecting block in, make the kelly lower extreme wear to establish in the first through-hole, then the kelly of handheld installation connecting block, plastic film is around installation section of thick bamboo a week, insert the second through-hole to the kelly lower extreme of installation connecting block again, then push into the standing groove to the kelly of installation connecting block from the breach, again to wearing to establish downthehole fixed bolt spiro union in the screw thread hole, accomplish the fixed to plastic film, and convenient operation.

Further inject, elevator lateral wall fixed mounting has fixed cover, the painting brush is worn to establish in fixed cover, fixed cover inner wall is close to installation section of thick bamboo one end fixed mounting and is kept off the ring, the painting brush is kept away from installation section of thick bamboo one end fixed mounting and is had the clamping ring, the painting brush is equipped with compression spring in keeping off between ring and the clamping ring, fixed cover is kept away from installation section of thick bamboo one end inner wall and is seted up there is the internal thread, fixed cover has the kicking block through the internal thread spiro. Due to the structural design, when the plastic film is assembled and disassembled, the ejector block can be unscrewed, at the moment, the painting brush is far away from the installation barrel under the action of the compression spring, and the pen point of the painting brush can retract into the fixed sleeve, so that the damage to the pen point of the painting brush in the process of assembling and disassembling the plastic film is avoided; when thread drawing is required to be performed on the plastic film, the jacking block is screwed up only after the plastic film is installed, the painting brush is jacked to move towards the installation barrel until the pen point of the painting brush is jacked against the plastic film.

The invention adopting the technical scheme has the advantages that:

1. the spiral line is drawn on the plastic film on the cylindrical mounting cylinder, and then the plastic film is unfolded, so that students can understand the drawing process of the spiral line, and the teaching effect is improved;

2. the transmission ratio between the mounting cylinder and the screw rod is changed, so that lines with different leads S are drawn on the plastic film through the painting brush, students are further helped to understand the drawing process of the spiral line, and the teaching effect is improved;

3. through being conical first activity dish and second activity dish cooperation drive belt, form a infinitely variable mechanism for drive ratio between installation section of thick bamboo and the lead screw can carry out infinitely variable control in certain extent, thereby changes wantonly to the helical pitch S of the lines that the painting brush was drawn on plastic film, improves teaching effect.

Drawings

The invention is further illustrated by the non-limiting examples given in the accompanying drawings;

FIG. 1 is a first schematic structural diagram of a drawing apparatus for mathematical education according to an embodiment of the present invention;

FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1;

FIG. 3 is an enlarged view of the structure at B in FIG. 1;

FIG. 4 is a schematic cross-sectional view of a drawing apparatus for mathematical education according to an embodiment of the present invention;

FIG. 5 is an enlarged view of the structure at C in FIG. 4;

FIG. 6 is a schematic structural diagram of a drawing apparatus for mathematical education according to an embodiment of the present invention;

FIG. 7 is an enlarged view of the structure of FIG. 6 at D;

FIG. 8 is a schematic structural diagram of a mounting barrel portion of an embodiment of a drawing apparatus for mathematics teaching according to the present invention;

FIG. 9 is an enlarged view of the structure at E in FIG. 8;

FIG. 10 is a schematic diagram of an exploded structure of a lifting block and a brush part of an embodiment of a drawing apparatus for mathematical education according to the present invention;

the main element symbols are as follows:

the mounting tube 1, the plastic film 10, the clamping rod 101, the notch 102, the clamping groove 103, the placing groove 104, the positioning plate 105, the first through hole 106, the second through hole 107, the connecting block 108, the threaded hole 109, the fixing bolt 1010, the fixing bolt,

A transmission belt 11, a first mounting shaft 12, a first bar-shaped groove 120, a first movable disc 13,

Lead screw 2, painting brush 20, fixing sleeve 201, pressing ring 202, compression spring 203, internal thread 204, top block 205,

A lifting block 21, a positioning hole 211,

A positioning rod 3, an upper mounting plate 31, a lower mounting plate 32,

A second mounting shaft 22, a second strip-shaped groove 220, a second movable disc 23,

A supporting frame 4,

A rotating shaft 5, a threaded rod 51, an adjusting block 52,

The base plate 6, the first gear 61, the third mounting shaft 610, the second gear 62, the third gear 63, the fourth gear 64, the fifth gear 65, the rotating shaft 650, and the crank 651.

Detailed Description

The present invention will be described in detail with reference to the drawings and specific embodiments, wherein like reference numerals are used for similar or identical parts in the drawings or the description, and implementations not shown or described in the drawings are known to those of ordinary skill in the art. In addition, directional terms, such as "upper", "lower", "top", "bottom", "left", "right", "front", "rear", and the like, used in the embodiments are only directions referring to the drawings, and are not intended to limit the scope of the present invention.

As shown in fig. 1 to 10, the mathematical education drawing device of the present invention includes an installation cylinder 1, a screw rod 2, a positioning rod 3, an upper installation plate 31 and a lower installation plate 32, the installation cylinder 1 and the screw rod 2 are rotatably installed between the upper installation plate 31 and the lower installation plate 32, the positioning rod 3 is fixedly installed between the upper installation plate 31 and the lower installation plate 32, the installation cylinder 1, the screw rod 2 and the positioning rod 3 are parallel to each other, a first transmission mechanism is installed between the installation cylinder 1 and the screw rod 2, a plastic film 10 is detachably installed on the installation cylinder 1, the plastic film 10 is unfolded to be rectangular, a lifting block 21 is screwed on the screw rod 2, a positioning hole 211 is formed on the lifting block 21, the lifting block 21 is slidably sleeved on the positioning rod 3 through the positioning hole 211, a painting brush 20 is installed on the lifting block 21, and a pen point of.

The first transmission mechanism comprises a transmission belt 11, a driving wheel and a driven wheel, the transmission belt is wound on the driving wheel and the driven wheel, the lower end of the mounting cylinder 1 penetrates through the lower mounting plate 32 to be integrally formed into a first mounting shaft 12, the driven wheel is mounted on the first mounting shaft 12, the lower end of the screw rod 2 penetrates through the lower mounting plate 32 to be integrally formed into a second mounting shaft 22, and the driving wheel is mounted on the second mounting shaft 22. The installation cylinder 1 and the screw rod 2 are in transmission connection through mutual matching of the transmission belt 11, the driving wheel and the driven wheel, and the installation cylinder is simple in structure and convenient to install.

From driving wheel including two first activity dish 13, 13 inner wall integrated into one piece of first activity dish has first bead, first bar groove 120 has been seted up to the outer wall axial of first installation axle 12, first bead is located first bar groove 120, first activity dish 13 can be followed first installation axle 12's axial and removed, the action wheel includes two second activity dishes 23, 23 inner wall integrated into one piece of second activity dish has the second bead, second bar groove 220 has been seted up to the outer wall axial of second installation axle 22, the second bead is located second bar groove 220, second activity dish 23 can be followed second installation axle 22's axial and removed, first activity dish 23 and second activity dish 13 all are the toper. Through the conical first movable disc 23 and the conical second movable disc 33 which are matched with the transmission belt 11, a stepless speed change mechanism is formed, so that the transmission ratio between the installation cylinder 1 and the screw rod 2 can be adjusted in a stepless mode within a certain range, the lead S of a line drawn on the plastic film 10 by the painting brush 20 is changed randomly, and the teaching effect is improved.

Lower mounting panel 32 below still is equipped with support frame 4, first drive mechanism rotates and installs between lower mounting panel 32 and support frame 4, still rotate between lower mounting panel 32 and the support frame 4 and install axis of rotation 5, each fixed mounting in axis of rotation 5 both ends has a threaded rod 51, the screw thread of the threaded rod 51 at same root axis of rotation 5 both ends revolves to the contrary, equal spiro union has a regulating block 52 on every threaded rod 51, the regulating block 52 and the first activity dish 13 of first activity dish 13 one side rotate to be connected, the regulating block 52 and the second activity dish 23 of second activity dish 23 one side rotate to be connected, still install second drive mechanism between two axis of rotation 5, the rotation opposite direction of two axis of rotation 5. When one of the rotating shafts 5 rotates, the second transmission mechanism can drive the other rotating shaft 5 to synchronously rotate in the opposite direction, so that the two adjusting blocks 52 on the same rotating shaft 5 move away from or towards each other, and the two adjusting blocks 52 on the other rotating shaft 5 move oppositely, so as to drive the first movable disc 13 and the second movable disc 23 to move, namely, when the two first movable discs 13 move away from each other, the two second movable discs 23 move towards each other, so that the purpose of adjusting the transmission ratio between the mounting cylinder 1 and the screw rod 2 is achieved.

Support frame 4 below fixed mounting has bottom plate 6, second drive mechanism installs between support frame 4 and bottom plate 6, second drive mechanism is including the first gear 61 that meshes in proper order, second gear 62, third gear 63 and fourth gear 64, two 5 lower extremes of axis of rotation pass support frame 4 integrated into one piece have third installation axle 610, first gear 61 and fourth gear 64 fixed mounting are on the third installation axle 610 that corresponds, the number of teeth of first gear 61 and fourth gear 64 equals, second gear 62 and third gear 63 rotate to be installed between support frame 4 and bottom plate 6. The transmission connection between the first gear 61 and the fourth gear 64 is completed through the second gear 62 and the third gear 63, that is, the transmission connection between the two rotating shafts 5 is completed, and the effect that the rotating directions of the two rotating shafts 5 are opposite is achieved; meanwhile, the first gear 61 and the fourth gear 64 have the same number of teeth, so that the two rotating shafts 5 can rotate at the same speed.

A rotating shaft 650 is rotatably arranged between the support frame 4 and the bottom plate 6, a fifth gear 65 is fixedly arranged on the rotating shaft 650, the fifth gear 65 is meshed with the fourth gear 64, and a crank 651 is fixedly arranged above the support frame 4 on the rotating shaft 650. The fifth gear 65 is rotated by the crank 651, so that the rest gears are driven to rotate, the transmission ratio between the barrel 1 and the screw rod 2 is changed, and the operation is more labor-saving; the fifth gear 65 is used for pulling the distance between the crank 651 and the rotating shaft 5, the mounting barrel 1, the lead screw 2 and the positioning rod 3, so that the crank 651 can rotate more conveniently.

The upper end of the screw rod 2 is also fixedly provided with a crank 651 after passing through the upper mounting plate 31. Lead screw 2 is rotated through crank 651, and then drives painting brush 20 upward movement, drives installation section of thick bamboo 1 simultaneously and rotates, and the operation is more laborsaving.

The two ends of the plastic film 10 are fixedly provided with clamping rods 101, the outer wall of the mounting cylinder 1 is axially provided with a notch 102, the notch 102 penetrates through the mounting cylinder 1, the mounting cylinder 1 is vertically provided with a clamping groove 103 and a placing groove 104 in the notch 102, one clamping rod 101 penetrates through the clamping groove 103, the bottom of the mounting cylinder 1 is fixedly provided with a positioning plate 105, the positioning plate 104 is provided with a first through hole 106 at the bottom of the clamping groove 103, the lower end of the clamping rod 101 penetrating through the clamping groove 103 is arranged in the first through hole 106, the positioning plate 104 is provided with a second through hole 107 at the bottom of the placing groove 104, the other clamping rod 101 is positioned in the placing groove 104, the lower end of the clamping rod 101 positioned in the placing groove 104 is arranged in the second through hole 107, the upper end of the clamping rod 101 positioned in the placing groove 104 is fixedly provided with a connecting block 108, the connecting block 108 is provided with a through hole, a, the fixing bolt 1010 is screwed into the threaded hole 109. When installing plastic film 10 on installation section of thick bamboo 1, can wear to establish the draw-in groove 103 to the kelly 101 from the top down of not installing connecting block 108 earlier, make the kelly 101 lower extreme wear to establish in first through-hole 106, then handheld installation connecting block 108 the kelly 101, wind plastic film 10 a week around installation section of thick bamboo, insert the kelly 101 lower extreme of installation connecting block 108 in the second through-hole 107 again, then push standing groove 104 from breach 102 to installation connecting block 108 the kelly 101, again wear to establish downthehole fixing bolt 1010 spiro union in screw hole 109, accomplish the fixed to plastic film 10, and convenient operation.

Fixed cover 201 is installed to 21 lateral walls of elevator, and painting brush 20 wears to establish in fixed cover 201, and fixed cover 201 inner wall is close to 1 one end fixed mounting of installation section of thick bamboo and keeps off the ring, and 1 one end fixed mounting of installation section of thick bamboo is kept away from to painting brush 20 has clamping ring 202, and painting brush 20 overlaps between keeping off ring and clamping ring 202 to be equipped with compression spring 203, and fixed cover 201 is kept away from 1 one end inner wall of installation section of thick bamboo and has been seted up internal thread 204, and fixed cover 201 has kick. When the plastic film 10 is assembled and disassembled, the ejector block 205 can be unscrewed, at the moment, the painting brush 20 is far away from the installation barrel 1 under the action of the compression spring 203, and the pen point of the painting brush 20 can retract into the fixing sleeve 201, so that the damage to the pen point of the painting brush 20 in the assembling and disassembling process of the plastic film 10 is avoided; when thread drawing needs to be performed on the plastic film 10, the jacking block 205 is screwed down after the plastic film 10 is installed, and the painting brush 20 is jacked to move towards the installation barrel 1 until the pen point of the painting brush 20 is jacked against the plastic film 10.

In the embodiment, when the drawing pen is used, the plastic film 10 is installed on the installation cylinder 1, then the jacking block 205 is screwed down, and the drawing pen 20 is jacked to move towards the installation cylinder 1 until the pen point of the drawing pen 20 is jacked against the plastic film 10;

then, rotating a crank 651 on the screw rod 2 to enable the screw rod 2 to rotate, further driving the painting brush 20 to move upwards, and simultaneously driving the installation barrel 1 to rotate, wherein in the rotating process, the pen point of the painting brush 20 draws a spiral line on the film 10;

after the drawing is completed, the plastic film 10 is removed from the mounting tube 1 and spread, and at this time, a plurality of mutually parallel inclined straight lines are clearly visible on the plastic film 10.

The mathematical teaching drawing device provided by the invention is described in detail above. The description of the specific embodiments is only intended to facilitate an understanding of the method of the invention and its core ideas. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.