Adjustable erasable lattice drawing device for blackboard Russian letter teaching and writing

Abstract

An adjustable and erasable lattice drawing device for blackboard Russian letter teaching and writing belongs to the technical field of Russian teaching, comprises writing claws (1), a claw fixing body (2), a claw fixing plug (3), a plate fixing chute (4), a plate pushing wheel (5), a claw control wheel (6), a claw adjusting wheel (7), a movable claw plate (8), a jacking claw fixing plug (9), a horizontal line liquid box (13) and a groove fixing bolt (110), and is characterized in that the number of the writing claws (1) is seven, and the distances between every two adjacent writing claws (1) are equal; each writing claw (1) is composed of a writing claw rod (16) and a writing claw head (17), and the horizontal line liquid box (13) is arranged in the center of the outer surface of the upper wall of the claw fixing body belly wall (19). The horizontal line liquid box cavity (100) is sealed after being filled with red horizontal line liquid (96), and the adding amount of the red horizontal line liquid (96) is half of the volume of the horizontal line liquid box cavity (100). The device is easy to manufacture, high in operability, low in cost and obvious in effect.

Description

Technical Field

[0001] The invention relates to an adjustable and erasable grid device for teaching and writing Russian letters on a blackboard, belonging to the technical field of Russian teaching. Background Art

[0002] The Phoenicians created the Phoenician alphabet based on the Sumerian cuneiform script in the Mesopotamian region and the Egyptian hieroglyphics in the Nile River region. There are 22 letters in total, only consonants, no vowels. This is the famous Phoenician alphabet. The Phoenician alphabet was introduced to Greece earlier and evolved into the Greek alphabet. The Greek alphabet gave birth to the Latin alphabet and the Cyrillic alphabet, becoming the common source of various European alphabets. Russian belongs to the Cyrillic alphabet. The Russian alphabet is a variant of the Cyrillic alphabet, with a total of 33 letters, used to express vowels and consonants, with uppercase and lowercase letters, and the difference between printed and handwritten. Many of the letters are similar to the Greek alphabet. Since grid drawing is a very common activity and behavior in daily learning or teaching, there are many related patent applications. The patents directly related to grid drawing are as follows: Magnetic grid frame fan-shaped application number: CN202430044193.5, wire grid frame application number: CN202430044185.0, a Chinese writing practice device application number: CN202323243656.X, a writing grid auxiliary device application number: CN202322636250.1, a white ash grid hanging device application number: CN202222672 432.X, an infrared grid ruler application number: CN202222555944.8, a laser-assisted grid device for writing application number: CN202222225356.8, a grid device for practicing calligraphy application number: CN202230199177.4, a paperweight for measuring character shapes application number: CN202220644630.2, a magnetic grid ruler for calligraphy application number: CN202123342027.3, a painting modeling auxiliary ruler application number: CN202123017145.7, a grid device application number: CN20212 1593931.9, a calligraphy art grid ruler application number: CN202121111876.5, a combined multifunctional grid ruler application number: CN202120600641.6, a ceramic grid device application number: CN202023207985.5, a calligraphy seamless grid device application number: CN202022589308.8, a calligraphy work grid device application number: CN202022159073.9, a convenient width-adjustable grid ruler application number: CN201922411152.1, a calligraphy free Application number for a grid ruler: CN201922254438.3, Application number for a multifunctional ruler: CN201922198969.5, Application number for a ruler for gridding: CN201921728363.1, Application number for a pottery engraving grid device: CN201921159744.2, Application number for a calligraphy theodolite: CN201620704340.7, Application number for an automatic grid device: CN201620050996.1, Application number for a new adjustable grid device: CN201520538732.6. A grid pen application number: CN201420790701.5, a simple grid device application number: CN201220740662.9, a blackboard grid device for Chinese teaching application number: CN201220248226.X, a blackboard grid device for Chinese teaching application number: CN201220024106.1, a blackboard grid device for Chinese teaching application number: CN201020691251.6, a blackboard grid device for Chinese teaching in middle schools application number: CN201020107692.7, a grid device Application number of device: CN200920017794.7, application number of fast grid ruler: CN200620168409.5, application number of pen that can be used as a ruler: CN200520110050.1, application number of new ruler: CN200420066656.5, application number of combined grid device: CN02277546.3, application number of new grid device: CN00233681.2, application number of multi-function combination pen: CN94204965.9, application number of rolling multi-purpose ruler pen: CN90224905.3. From the above listed patents, it can be seen that there are two types of grid drawing: one is the auxiliary patent, which sets various structures to make the lines drawn by the grid straight and beautiful, and the other is the patent for directly marking the writing and drawing lines. Each has its own advantages, and the tools and methods used for different needs are also completely different. Russian letters are different from letters in other languages. They need special grid lines to be written, so that the letters written are beautiful. However, these grid lines are not completely straight, and the spacing between them is not exactly the same. If it takes a long time to draw one by one, and the Russian letter teaching process needs to be completed within a specific time, how to use chalk to quickly, regularly, beautifully and beautifully draw the required grid lines on the blackboard in the Russian letter teaching process in order to write Russian letters has become a major problem that needs to be solved urgently. Therefore, based on the limited class time, the chalk is set with a specific spacing and can be used as needed, so as to quickly draw the required lines on the blackboard, so as to achieve the purpose of standardizing the writing position and making the writing beautiful. It is necessary to invent an adjustable and erasable grid device for teaching and writing Russian letters on a blackboard. . Summary of the invention

[0003] In order to overcome the problem of how to use chalk to quickly, regularly, beautifully and nicely draw required grid lines on a blackboard in the process of teaching Russian letters so as to write Russian letters, the present invention provides an adjustable and erasable grid-drawing device for teaching and writing Russian letters on a blackboard. The adjustable and erasable grid-drawing device for teaching and writing Russian letters on a blackboard utilizes seven writing claws arranged at the front of a fixed claw body, cooperates with a fixed claw plug and a top fixed claw plug, and uses the correspondence between the liquid surface of a red horizontal line liquid in a horizontal line liquid box and the scale line to independently and guidedly draw five horizontal lines or oblique lines with an angle of 55° between the vertical direction and the horizontal line, and finally, wipe off the extra lines above the first horizontal line and below the fifth horizontal line with a wet cloth, so as to achieve the purpose of quickly, regularly, beautifully and nicely drawing required grid lines on the blackboard, and is used for the purpose of writing Russian letters when teaching Russian letters on a blackboard.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] The adjustable erasable grid device for teaching and writing Russian letters on a blackboard of the present invention comprises a writing claw 1, a fixed claw body 2, a fixed claw plug 3, a fixed plate slide groove 4, a push plate wheel 5, a control gripping wheel 6, an adjusting claw wheel 7, a movable claw plate 8, a top fixed claw plug 9, a horizontal line liquid box 13, and a fixed groove bolt 110. The invention is characterized in that: the writing claws 1 are 7 in total, the spacing between two adjacent writing claws 1 is equal, each writing claw 1 is composed of a writing claw rod 16 and a writing claw head 17, and each writing claw head 17 includes a chalk 26, a pen insertion port 27, a fixed pen barrel outer wall 28, a fixed pen barrel inner wall 29, a fixed pen barrel cavity 30, a push pen rod head surrounding cavity 31, a fixed rod bead cavity 32, and a push rod bead spring 33, a rod fixing bead 34, a rod fixing bead groove 35, a pen pusher 36, a pen pusher through hole 37, a pen pusher groove 38, a pen pusher head plate 39, a pen pusher non-groove portion 40, a pen pusher bottom plate 41, a pen pusher bottom plate cushion 42, a pen pusher bottom plate body 43, a writing claw rod base plate 44, a writing claw rod fixed shaft 45, a writing claw rod movable seam 46 and a pen pusher head leaf spring 102. The chalk 26 is a commercially available dust-free chalk made of calcium carbonate limestone, calcium sulfate plaster of Paris, polyvinyl alcohol, polypropylene glycol, metal oxide, glycerin and water for writing on a blackboard; the specifications of the chalk 26 are all 75 mm in length, 10.2 mm in diameter at the large end and 8. 5 mm; when the chalk 26 is installed and used in the adjustable erasable grid device for teaching and writing Russian letters on the blackboard, the big end is inserted into the fixed pen barrel cavity 30 from the pen insertion port 27, and when it is inserted into the lower surface of the lower plate of the push pen rod head plate 39, the length of the chalk 26 exposed at the lower end of the writing claw head 17 is 5-10 mm; the pen insertion port 27 is an opening in the center of the lower end surface of the writing claw head 17, which is circular and has a diameter of 9-10 mm, which is slightly smaller than the diameter of the big end of the chalk 26. The surrounding of the pen insertion port 27 is a latex elastic fixed pen barrel inner wall 29, and the thickness of the fixed pen barrel inner wall 29 here is 1 mm. Since the diameter of the pen insertion port 27 is slightly smaller than the diameter of the big end of the chalk 26, the pen insertion port 2 The inner wall 29 of the solid pen barrel around the outer wall 28 of the solid pen barrel is elastic; the inner wall 29 of the solid pen barrel is located on the inner side of the outer wall 28 of the solid pen barrel, and the space enclosed by the inner wall 29 of the solid pen barrel is the solid pen barrel cavity 30, which is used to hold the upper part of the chalk 26; the inner wall 29 of the solid pen barrel is latex, elastic, and has a thickness of 1-2.5 mm. In the surrounding walls of the outer wall 28 of the solid pen barrel, the thickness of the inner wall 29 of the solid pen barrel gradually decreases from bottom to top, with a thickness of 2.5 mm at the bottom and 1 mm at the top; the outer wall 28 of the solid pen barrel is the outer wall of the writing claw 17, which is made of copper, stainless steel or aluminum alloy, and is composed of surrounding walls, a bottom wall and a top wall. The thickness of the surrounding walls of the outer wall 28 of the solid pen barrel is 0.The thickness of the top wall of the outer wall 28 of the solid pen barrel is 5-5 mm, the height is 60-65 mm, the thickness in the upper and lower directions is equal, and the diameter of the cylindrical inner cavity surrounded by it is 15 mm; the thickness of the bottom wall of the solid pen barrel outer wall 28 is 1-2 mm, a circular hole is set in the center, the diameter of the circular hole is 11-12 mm, and the inner surface is lined with a solid pen barrel inner wall 29 with a thickness of 1 mm. The circular hole formed in the center of the solid pen barrel inner wall 29 is the pen insertion port 27; the thickness of the top wall of the solid pen barrel outer wall 28 is 5-20 mm, a circular hole is set in the center, which is called the push pen rod through hole 37. The diameter of the push pen rod through hole 37 is 2-5 mm, and the inner surface is smooth. It is the channel for the push pen rod 36 to pass through; the upper end of the entire solid pen barrel cavity 30 is connected to the pen barrel through the push pen rod through hole 37 The outer world is communicated, and the lower end is communicated with the outer world through the pen insertion port 27; the pen push rod head surrounding cavity 31 is the part of the upper end of the fixed pen barrel cavity 30 that holds the pen push rod head plate 39 and the pen push rod head leaf spring 102, and the pen push rod head surrounding cavity 31 is a part of the fixed pen barrel cavity 30; the fixed rod bead cavity 32 is a cylindrical groove for fixing the fixed rod bead 34, and there are 2 of them, which are symmetrically arranged on a straight line of a circular structure through the central axis of the push pen rod 36, and the diameter of each fixed rod bead cavity 32 is 1 mm and the depth is 3-5 mm; the push rod bead spring 33 is made of spring steel, with a diameter of 0.95 mm and a length of 2.5-4.5 mm; the push pen rod 36 is composed of a push pen rod groove portion 38, a push pen rod head plate 39, a push pen rod non-groove portion 40, and a push pen rod. The pen holder bottom plate 41 is composed of the pen pusher 36, which is a structural component for pushing the chalk 26 out of the pen insertion port 27 into the fixed pen barrel cavity 30; the pen pusher 36 is composed of the pen pusher bottom plate 41, the pen pusher non-groove portion 40, the pen pusher groove portion 38, and the pen pusher head plate 39 from top to bottom; the pen pusher bottom plate 41 is the expanded part of the upper end of the pen pusher 36, which is cylindrical, and the diameter of the pen pusher bottom plate 41 is 10-15 mm and the height is 5-10 mm. It is composed of a pen pusher bottom plate cushion 42 and a pen pusher bottom plate body 43; the pen pusher bottom plate cushion 42 is the upper part of the pen pusher bottom plate 41, which is made of silicone and has a thickness of 3-6 mm; the pen pusher bottom plate body 43 is made of copper, stainless steel or aluminum alloy, and has a thickness of 2-4 The upper surface is adhered to the push pen rod bottom plate cushion 42 by adhesive, and the center of the lower surface is welded to the upper end of the push pen rod non-groove part 40; the push pen rod non-groove part 40 is made of copper, stainless steel or aluminum alloy, with a smooth surface, without a rod fixing bead groove 35, and a circular cross-section with a diameter of 1.95-4.95 mm and a length of 10-20 mm; the push pen rod groove part 38 is a part where two rod fixing bead grooves 35 are symmetrically arranged on the surface below the push pen rod non-groove part 40, the upper end of the push pen rod groove part 38 is connected to the push pen rod non-groove part 40 to form a whole, and the lower end is welded to the center of the upper surface of the upper plate of the push pen rod head plate 39; the rod fixing bead 34 is made of manganese steel, spherical, with a diameter of 0.95 mm; the rod bead groove 35 is hemispherical, with a diameter of 1 mm, and is symmetrically arranged on the outer surface of the push pen rod groove 38. After being installed on the writing claw head 17, the central axis of the two symmetrically arranged rod bead grooves 35 and the central axis of the rod bead cavity 32 are in the same plane. On the surface of the push pen rod groove 38, the upper and lower adjacent rod bead grooves 35 are 5 mm apart, that is, the lower edge of the upper rod bead groove 35 is 5 mm away from the upper edge of the lower rod bead groove 35; the push pen rod head plate 39 is the structure of the lower end of the push pen rod 36, which is composed of an upper plate, a push pen rod head leaf spring 102 and a lower plate. The upper plate of the push pen rod head plate 39 is made of manganese steel and is in the shape of a disc. The diameter of the upper plate of the circular push pen rod head plate 39 is 8.5 mm and the thickness is 1 mm; the push pen rod head leaf spring 102 is spring steel, with a diameter of 6-7 mm and a height of 3-5 mm. The upper end is welded to the lower surface of the upper plate of the push pen rod head plate 39, and the lower end is welded to the upper surface of the lower plate of the push pen rod head plate 39; the lower plate of the push pen rod head plate 39 is manganese steel, in the shape of a disc, and the diameter of the circular push pen rod head plate 39 is 8.5 mm and the thickness is 1 mm; the fixed writing claw rod substrate 44 is made of copper, stainless steel or aluminum alloy, a total of 2 pieces, arranged in parallel, the two fixed writing claw rod substrates 44 are 5-10 mm apart, and each fixed writing claw rod substrate 44 is semicircular in longitudinal section, with a diameter of 15-30 mm and a thickness of 1-2 mm; the fixed writing claw rod substrate 44 is welded to the surrounding wall of the outer wall 28 of the fixed pen holder in the up and down directions. The outer surface of the fixed writing claw rod substrate 44 has a circular hole with a diameter of 3-5 mm in the center; the writing claw rod fixed shaft 45 is made of manganese steel, cylindrical, and has a diameter of 3-5 mm. After being inserted into the circular hole in the center of the fixed writing claw rod substrate 44, the outer surface of the central part is welded and fixed to the outer end of the writing claw rod 16; the writing claw rod 16 is made of manganese steel, cylindrical, and has a diameter of 4-8 mm. The lower surface 5-10 mm away from the inner end is welded to the top surface of the moving claw plate 8, so that the central axis of the writing claw rod 16 is perpendicular to the plane where the inner and outer surfaces of the moving claw plate 8 are located; the writing claw rod movable seam 46 is a gap between the outer end of the writing claw rod 16 and the outer surface of the surrounding wall of the fixed pen holder outer wall 28; the horizontal line liquid box 13 is hemispherical and has a diameter of 5-1 0 cm, arranged at the center of the outer surface of the upper wall of the belly wall 19 of the solid claw body; the horizontal line liquid box wall 101 is the outer wall of the horizontal line liquid box 13, which is made of transparent plastic or glass and has a thickness of 1-2 mm. The cavity surrounded by the horizontal line liquid box wall 101 is the horizontal line liquid box cavity 100, which is filled with red horizontal line liquid 96 and then sealed without any opening; the red horizontal line liquid 96 is prepared from three kinds of pigments and water, and the ratio of the three kinds of pigments is: bright red: light yellow: fluorescent orange-red = 10:3:2, the bright red pigment is carmine, the light yellow pigment is lead chrome yellow, iron yellow, strontium calcium yellow, transparent yellow or benzidine yellow, and the fluorescent orange-red pigment is AF555 succinimide ester or trisulfonic acid-Cy3.5-carboxylic acid; the amount of red horizontal line liquid 96 added is half of the volume of the horizontal line liquid box cavity 100; after the red horizontal line liquid 96 is added, the horizontal line liquid box wall 101 is marked with a level gauge to make a horizontal mark 106 and a 55° oblique mark 107; the horizontal line liquid box solid ring 97 is made of copper, stainless steel or aluminum alloy, in a circular ring shape, the circular ring body is the horizontal line liquid box solid ring body 99, the thickness of the horizontal line liquid box solid ring body 99 is 0.5-1 mm, the outer half of the cross section of the horizontal line liquid box solid ring body 99 is a straight line, and the inner half is an arc shape, and the inner half is just stuck on the outer surface of the lower edge of the horizontal line liquid box wall 101, and 3-4 solid ring screws 98 are set at equal angles in the center of the outer side of the horizontal line liquid box solid ring body 99. .

[0006] The solid claw body 2 is in the shape of a brush with a handle; the solid claw body 2 is divided into two parts, the front half of the solid claw body 2 is the solid claw body belly 11; the back half of the solid claw body 2 is the solid claw body handle 12; the outer walls of the solid claw body belly 11 and the solid claw body handle 12 are connected to each other to form a whole, the solid claw body belly 11 and the cavity in the solid claw body handle 12 are connected together, and the outer wall of the solid claw body belly 11 is the solid claw body belly wall 19; the solid claw body belly wall 19 is made of stainless steel or plastic and has a thickness of 1-2 mm; the cavity surrounded by the solid claw body belly wall 19 is the solid claw body belly cavity 18, and a horizontal line liquid box 13 is fixed in the center of the outer surface of the upper wall of the solid claw body belly wall 19; the outer wall of the solid claw body handle 12 is the solid claw body handle wall 21, and the solid claw body handle wall 21 is made of stainless steel or plastic and has a thickness of 1-2 mm m; the cavity surrounded by the wall 21 of the solid claw body handle is the solid claw body handle cavity 20; the solid claw body belly cavity 18 and the solid claw body handle cavity 20 are provided with a part of the solid claw body frame 14, the distance adjustment fixed groove 15 and the writing claw rod 16; 6 fixed plate slides 4 are fixed above the distance adjustment fixed groove 15, and each fixed plate slide 4 is fixed with a movable claw plate 8; the solid claw body 2 is composed of a solid claw body front edge seam 10, a solid claw body belly 11, a solid claw body handle 12, a solid claw body frame 14, a distance adjustment fixed groove 15, a writing claw rod 16, a writing claw head 17, a solid claw body belly cavity 18, a solid claw body belly wall 19, a solid claw body handle cavity 20, a solid claw body handle wall 21, a connecting bracket 22, a central bracket 23, an intermediate bracket 24, and an oblique bracket 25; the solid claw body front edge seam 10 is a crack on the front edge of the solid claw body belly 11, and is composed of a solid claw body belly The front edges of the upper and lower parts of the wall 19 are formed, and the inner surface of the front edge seam 10 of the solid claw body has a semicircular groove; the front edge seam 10 of the solid claw body is connected to the left and right, and the 7 writing claw rods 16 without the solid claw plug 3 and the top solid claw plug 9 can move left and right in the front edge seam 10 of the solid claw body; the solid claw body frame 14 is a support fixed in the solid claw body 2, which is made of manganese steel and has a circular cross-section. The diameter of the circular solid claw body frame 14 is 3-5 mm; according to different positions and functions, each solid claw body frame 14 is named as a connecting bracket 22, a central bracket 23, an intermediate bracket 24 and an oblique bracket 25; the central bracket 23 is the most central bracket of the entire solid claw body 2, and runs through the center of the solid claw body belly 11 and the solid claw body handle 12. The front end of the central bracket 23 and the two oblique brackets at the front end The tops of the brackets 25 are welded together, and at the same time, the rear end of the most central writing claw rod 16 is welded above the front of the central bracket 23; the rear end of the central bracket 23 is fixed to the center of the last connecting bracket 22 of the fixed claw body handle 12; there are 4 oblique brackets 25, which are obliquely distributed in the belly cavity 18 of the fixed claw body and arranged along the edge of the belly cavity 18 of the fixed claw body. There are 2 oblique brackets 25 in the front part of the belly cavity 18 of the fixed claw body and 2 in the rear part. The 4 oblique brackets 25 constitute the supporting frame of the belly cavity 18 of the fixed claw body; the side brackets 24 are located on both sides of the central bracket 23, and are parallel to the central bracket 23, and there are 3 pairs in total, which are respectively located at the central position between the central bracket 23 and the side brackets 24 at the edge of the belly cavity 18 of the fixed claw body, 1 cm away from the central bracket 23, and at the edge of the belly cavity 18 of the fixed claw body;The side bracket 24 located at the central position between the central bracket 23 and the side bracket 24 at the edge of the solid claw body belly cavity 18 is all located in the solid claw body belly 11, and the lower surface of the front end of the side bracket 24 is welded to the frontmost connecting bracket 22, and the rear end of the side bracket 24 is welded to the center of a rear oblique bracket 25 in the solid claw body belly cavity 18; the side bracket 24 at a distance of 1 cm from the central bracket 23 is adjacent to the central bracket 23, and the lower surface of the front end of the side bracket 24 is welded to the frontmost connecting bracket 22, and the lower surface of the central part of the side bracket 24 is welded to the rear oblique bracket 25, and the rear end of the side bracket 24 is welded to a short connecting bracket 2 at the rear. 2 end; the front end of the side bracket 24 at the edge of the claw body belly cavity 18 is free, and the side 1 cm away from the free end is welded to the outer end of the front oblique bracket 25, and the rear end of the side bracket 24 is welded to the outer end of the front connecting bracket 22 and the rear oblique bracket 25; there are 2 connecting brackets 22, the front connecting bracket 22 is located at the rear edge of the distance adjustment fixed groove 15, and both ends extend to the rear end of the side bracket 24 at the edge of the claw body belly cavity 18, and the rear connecting bracket 22 is located at the rear of the claw body handle cavity 20, and the two ends are welded to the inner side of the side bracket 24 at a distance of 1 cm from the central bracket 23, and the center of the connecting bracket 22 is welded to the lower surface of the rear of the central bracket 23; adjust The distance fixing groove 15 is made of copper, stainless steel or aluminum alloy. The distance adjusting fixing groove 15 is in the shape of a rectangular parallelepiped. The side walls at both ends in the length direction are welded and fixed to the inner side of the side bracket 24 at the edge of the belly cavity 18 of the fixed claw body. The rear side wall is welded and fixed to the front of the front connecting bracket 22. The front side wall is welded together with the front oblique bracket 25 at the junction. The distance adjusting fixing groove 15 and the side bracket 24 and the oblique bracket 25 at the junction are tightly connected and fixed together; the thickness of the plate used to make the distance adjusting fixing groove 15 is 1-2 mm. The distance adjusting fixing groove 15 has only four walls and a bottom wall, and no top wall. Six fixed plate slides 4 and six movable claw plates 8 are fixed in the distance adjusting fixing groove 15, and six fixed plate slides 4 and six movable claw plates 8 are arranged in three rows in the front and back of the distance adjustment fixed groove 15, each row has two symmetrically arranged fixed plate slide grooves 4 and movable claw plates 8, and the spacing between two adjacent rows is equal; the inner ends of the two fixed plate slide grooves 4 in the first row are welded to the two side surfaces of the central bracket 23, and the inner ends of the two fixed plate slide grooves 4 are close together. A control and grasping wheel 6 is welded above the welding place of the three, and the control and grasping wheel 6 is connected to the push plate wheels 5 on the left and right sides and the fixed chain wheels 95 at the outer ends of the two fixed plate slide grooves 4 through the force guide chain 90. The push plate wheel 5 is in front of the movable claw plate 8 of the first row, and the second row of movable claw plates 8 is behind it. An adjusting claw wheel 7 is arranged between the second row of movable claw plates 8 and the third row of movable claw plates 8. The push plate wheel 5 and the adjusting claw wheel 7 have the same size and structure. ;

[0007] The push plate wheel 5 is located between the two movable claw plates 8 in the first row and the second row. The push plate wheel 5 is connected to the control gripping wheel 6 after being linked by a force guide chain 90. The push plate wheel 5 is composed of a large push plate wheel 83, a small push plate wheel 84, and a push plate wheel shaft 85. The large push plate wheel 83 and the small push plate wheel 84 have push plate wheel rim teeth 94 on their peripheries. The structure and function of the push plate wheel rim teeth 94 are the same as the teeth on the periphery of the round wheel at the pedal of the straight-line vehicle. The outer edges of all the push plate wheel rim teeth 94 form a streamlined curve; the small push plate wheel 84 The push plate wheel rim teeth 94 mesh with the tooth grooves of the force guide chain 90; the diameter of the push plate wheel big wheel 83 is 3 times the diameter of the push plate wheel small wheel 84, and the teeth of the push plate wheel big wheel 83 mesh with the top side edge teeth 70 of the movable claw plate; the push plate wheel big wheel 83 and the push plate wheel small wheel 84 share a push plate wheel shaft 85, which is made of manganese steel and is cylindrical. It passes through the circular hole in the center of the push plate wheel big wheel 83 and the push plate wheel small wheel 84, and connects the push plate wheel big wheel 83 and the push plate wheel small wheel 84 to form a whole.

[0008] The adjusting claw wheel 7 is located between the two movable claw plates 8 in the second and third rows. The adjusting claw wheel 7 has only one wheel disc, which is called the adjusting claw wheel disc 103. The size and structure of the adjusting claw wheel disc 103 are the same as the push plate wheel large wheel 83, and the adjusting claw wheel teeth 104 are the gear teeth on the periphery of the adjusting claw wheel disc 103; the axis in the center of the adjusting claw wheel disc 103 is the adjusting claw wheel shaft 105, which is made of manganese steel and is cylindrical. It passes through the circular hole in the center of the adjusting claw wheel disc 103, and both ends are exposed to the surface of the adjusting claw wheel disc 103; and then when the adjusting claw wheel 7 rotates, the movable claw plates 8 in the second and third rows are driven to move relative to each other; because the size and structure of the adjusting claw wheel disc 103 are the same as the push plate wheel large wheel 83, the adjusting claw wheel teeth 104 and the push plate wheel rim teeth 94 are the same in size and shape, and the movable claw plate top side edge teeth 70 of the six movable claw plates 8 are the same in size and structure.

[0009] The control and grab wheel 6 is a rotating wheel for the operator to manually adjust the distance between two adjacent writing claw rods 16. It is arranged at the central position of the front connecting bracket 22 corresponding to the belly of the fixed claw body 11. The circular hole in the center of the control and grab wheel 6 is a circular hole through which the control and grab wheel shaft 91 passes. After the control and grab wheel shaft 91 passes through the circular hole, the upper end swells, and the lower end of the control and grab wheel shaft 91 passes through the control and grab wheel inner wheel 86 and is inserted into the shaft groove on the inner surface of the distance adjustment fixed groove 15; the control and grab wheel 6 is composed of the control and grab wheel inner wheel 86, the control and grab wheel outer wheel 87, the fixed chain wheel body 88, the fixed chain wheel shaft 89, the guide chain 90, the control and grab wheel shaft 91, the control and grab wheel crank handle 92, the control and grab wheel crank handle 93, the push plate wheel rim teeth 94, and the fixed chain wheel 95; the control and grab wheel inner wheel 86 is a gear located on the inner side of the upper wall of the belly wall 19 of the fixed claw body, and the control and grab wheel inner wheel 86 is surrounded by the gear. The edge has gear teeth that can mesh with the force-guiding chain 90; the outer wheel 87 of the control wheel is a metal disc with no gear teeth on the edge located on the outer side of the upper wall of the belly wall 19 of the solid claw body, which is made of copper, stainless steel or aluminum alloy, with a thickness of 1-2 mm and a diameter of 2 / 3 of the diameter of the inner wheel 86 of the control wheel; the structure and function of the force-guiding chain 90 are the same as those of a commercially available bicycle chain, with sections one by one, and each section has pores; the center of the inner wheel 86 of the control wheel and the outer wheel 87 of the control wheel are fixedly connected together to form a whole through the control wheel shaft 91; the control wheel shaft 91 is made of manganese steel and is cylindrical. The lower end of the control wheel shaft 91 is fixed to the inner side of the lower wall of the belly wall 19 of the solid claw body through a bearing, and the upper part of the control wheel shaft 91 is fixed to the corresponding circular hole on the upper wall of the belly wall 19 of the solid claw body through a bearing. The upper end is fixed at the center of the central end of the control and grab wheel crank handle 93; the control and grab wheel crank handle 93 is a handle-shaped protrusion in the center of the outer surface of the control and grab wheel outer wheel 87. The length of the control and grab wheel crank handle 93 is 1-5 mm shorter than the radius of the control and grab wheel outer wheel 87, and the thickness of the control and grab wheel crank handle 93 is 1-5 mm. The two ends of the control and grab wheel crank handle 93 are respectively called the central end and the outer end; the central end of the control and grab wheel crank handle 93 is thicker, and the width of the widest part of the central end of the control and grab wheel crank handle 93 is greater than the diameter of the control and grab wheel shaft 91, and the center of the central end of the control and grab wheel crank handle 93 is connected to the control and grab wheel shaft 91 as a whole; the outer end of the control and grab wheel crank handle 93 is thinner, and the width of the widest part of the outer end of the control and grab wheel crank handle 93 is half of the width of the widest part of the central end, and a circular hole is set in the center of the outer end of the control and grab wheel crank handle 93, and the circular hole is divided into an upper and lower part, and the aperture of the upper part 1-2 mm smaller than the aperture of the upper part; the control and grab wheel crank handle convex 92 is divided into an upper and lower part, the upper part of the control and grab wheel crank handle convex 92 is located outside the center of the outer end of the control and grab wheel crank handle 93, is pear-shaped, and has a length of 3-5 cm, which is convenient for the operator to hold the control and grab wheel crank handle convex 92, and the lower part of the control and grab wheel crank handle convex 92 is made of cast iron and is cylindrical. The upper end of the lower part of the control and grab wheel crank handle convex 92 is fixed to the lower end of the upper part of the control and grab wheel crank handle convex 92 by a bolt structure; the lower part of the control and grab wheel crank handle convex 92 is divided into an upper half and a lower half, and the diameters of the cylinders of the upper half and the lower half differ by 1-2 mm. The length of the upper half of the lower part of the control and grab wheel crank handle convex 92 is greater than the length of the upper half of the circular hole by 1-2 mm, and a magnet block is inlaid at the lower end of the lower half of the lower part of the control and grab wheel crank handle convex 92;A circular cast iron ring is arranged on the outer side of the upper wall of the belly wall 19 of the fixed claw body corresponding to the position below the control grip wheel crank handle 92; the fixed chain wheel 95 is a rotatable disc-shaped gear located at the outer end of the first row of fixed plate slide grooves 4, and the fixed chain wheel 95 is divided into an inner part and an outer part, the outer part is a fixed chain wheel body 88, and the fixed chain wheel body 88 is a round cake with a thick middle, a thin edge and a gear tooth. The thickness of the thickest part in the middle of the fixed chain wheel body 88 is 0.5-2 cm, and the thinnest part at the edge is 0.5-2 cm. The thickness is 1-5 mm, the gear teeth on the periphery of the fixed chain wheel body 88 mesh with the gear teeth holes in the middle of the guide chain 90, the diameter of the fixed chain wheel body 88 is 1 / 4 of the diameter of the inner wheel 86 of the control wheel, a circular hole is set in the center of the fixed chain wheel body 88, and a bearing is lined in the circular hole, and a cylindrical fixed chain wheel shaft 89 is inside the bearing; the fixed chain wheel shaft 89 is made of manganese steel, cylindrical, and 1-3 cm long, and both ends are fixed to the inner surface of the belly wall 19 of the fixed claw body. ;

[0010] The fixed claw plug 3 is a plug that is inserted into the front edge slit 10 of the fixed claw body to fix the five writing claws 1 used for drawing lines in the horizontal direction. The five writing claws 1 are the first, third, fourth, fifth and seventh writing claws 1, respectively. Each fixed claw plug 3 is made of plastic or rubber. The fixed claw plug 3 is divided into a front and a rear part. The front part of the fixed claw plug 3 is called a fixed claw plug base 108, and the fixed claw plug base 108 is divided into an upper and a lower part. The upper part of the fixed claw plug base 108 is called a fixed claw plug base upper part 52, and the lower part of the fixed claw plug base 108 is called a fixed claw plug base lower part 49. The fixed claw plug base upper part 52 and the fixed claw plug base lower part 49 are close to each other. After the two are raised, the gap formed between the two is called the fixed claw plug joint 48. At the fixed claw plug joint 48 on one side, multiple fixed claw plug fixing stitching pages 53 are arranged in the front and rear directions. Each fixed claw plug fixing stitching page 53 is in the shape of a thin sheet, and the two sides are respectively connected to the lower edge of the upper part 52 of the fixed claw plug base and the upper edge of the lower part 49 of the fixed claw plug base, and a groove is pressed out in the middle; because the fixed claw plug joint 48 on this side is provided with multiple fixed claw plug fixing stitching pages 53, the fixed claw plug joint 48 on this side is specially called the fixed claw plug fixing joint 51; the rear part of the fixed claw plug 3 is called the fixed claw plug plug 47; the fixed claw plug plug 47 is divided into upper and lower parts, and the space between the two parts is The seam is a part of the fixed claw plug joint seam 48, and a fixed claw plug fixing seam 51 behind the fixed claw plug joint seam 48 is provided with a fixed claw plug fixing seam page 53; a cylindrical fixed claw plug writing claw rod through hole 50 is provided in the center of the fixed claw plug base 108 and the fixed claw plug plug 47 in the front-to-back direction; the fixed claw plug plug surface concave 54 is a groove on the surface of the fixed claw plug plug 47, and there is one on each of the upper and lower surfaces of the fixed claw plug plug 47, and the depth is 1 / 6 of the width of the fixed claw plug base 108 in the upper and lower directions; on the surface of the fixed claw plug plug 47, except for the surfaces of the two fixed claw plug plug surface concave 54, which are inwardly concave curved surfaces, the rest of the surfaces are outwardly protruding curved surfaces. The front edge seam 10 of the solid claw body is composed of a front edge seam upper lip 55, a front edge seam opening 56, and a front edge seam lower lip 57. The front edge seam upper lip 55 is the portion of the solid claw body belly wall 19 corresponding to the top of the solid claw plug plug 47 after the front edge of the solid claw body belly wall 19 is inserted into the solid claw plug plug 47, and the lower surface protrudes downward to form an arcuate surface, while the remaining part is recessed upward to form an arcuate surface; the front edge seam lower lip 57 is the portion of the solid claw body belly wall 19 corresponding to the bottom of the solid claw plug plug 47 after the front edge of the solid claw body belly wall 19 is inserted into the solid claw plug plug 47, the upper surface protrudes upward to form an arcuate surface, and the remaining part is recessed downward to form an arcuate surface; the front edge seam opening 56 is the space between the front edge seam upper lip 55 and the front edge seam lower lip 57.

[0011] The top-lifting fixed claw plug 9 is a plug that is inserted into the front edge seam 10 of the fixed claw body to fix the two writing claws 1 used for drawing lines at an oblique angle of 55° at this location. The two writing claws 1 are the second and sixth writing claws 1, respectively. Each top-lifting fixed claw plug 9 is made of plastic or rubber. The top-lifting fixed claw plug 9 is divided into two parts, front and rear. The front part of the top-lifting fixed claw plug 9 is called the top-lifting fixed claw plug base 109. The top-lifting fixed claw plug base 109 is divided into three parts. The upper part of the top-lifting fixed claw plug base 109 is composed of the front half of the top-lifting fixed claw plug top block 64 and the top-lifting fixed claw plug base upper part 58. The top-lifting fixed claw plug top block 64 is located in the center of the top-lifting fixed claw plug base upper part 58. The upper bottom of the top-lifting fixed claw plug top block 64 is the top-lifting fixed claw plug base. The central part and the lower bottom of the upper part 58 are the top and the side walls of the writing claw rod through-hole 63 of the top-lifting and solid claw plug. The upper part 58 of the top-lifting and solid claw plug base and the upper part of the top-lifting and solid claw plug plug 59 are a whole, and together constitute the top-lifting and solid claw plug top block 64; the gap between the upper part 58 of the top-lifting and solid claw plug base and the top-lifting and solid claw plug plug 59 is called the top-lifting and solid claw plug top block side seam 65, and the top-lifting and solid claw plug top block side seam 65 runs through the entire top-lifting and solid claw plug 9 from front to back; the top-lifting and solid claw plug top block side seams 65 on both sides of the rear upper side edges of the top-lifting and solid claw plug top block 64 are each provided with a top-lifting and solid claw plug top block connecting ligament 68, and the top-lifting and solid claw plug top block connecting ligament 68 is latex and has strong elasticity; the lower part of the top-lifting and solid claw plug base 109 is called the top-lifting and solid claw plug The lower part 60 of the top fixing claw plug base, the upper part 58 of the top fixing claw plug base and the lower part 60 of the top fixing claw plug base are placed together, and the gap formed between the two is called the top fixing claw plug joint 61. At the top fixing claw plug joint 61 on one side, a plurality of top fixing claw plug joint sew pages 67 are arranged in the front-to-back direction. Each top fixing claw plug joint sew page 67 is in the shape of a thin sheet, and the two sides are respectively connected to the lower edge of the upper part 58 of the top fixing claw plug base and the upper edge of the lower part 60 of the top fixing claw plug base, and a groove is pressed out in the middle. The thickness of the groove is half of the thickness of the thin sheets on both sides. However, since plastic or rubber has strong toughness, the top fixing claw plug joint sew page 67 can connect the upper part 58 of the top fixing claw plug base and the top fixing claw plug base The lower part 60 is firmly connected together; since the top-lifting claw plug joint 61 on this side is provided with a plurality of top-lifting claw plug joint pages 67, the top-lifting claw plug joint 61 on this side is specifically called the top-lifting claw plug fixed joint 66; the top rod spring 62 is located at the center of the bottom surface of the top-lifting claw plug writing claw rod through hole 63 in the middle of the bottom part 60 of the top-lifting claw plug base, and the bottom part 60 of the top-lifting claw plug base here has a groove, which is cylindrical, with a depth of 3-5 mm and a diameter of 3-5 mm. The lower part of the top rod spring 62 is arranged in the groove, and the upper part of the top rod spring 62 is exposed 3-5 mm from the groove; the top rod spring 62 is made of spring steel, and the diameter of the cross section of the spring wire used is 0.3-0.5 mm, and the pitch is 0.5 mm; the rear part of the top-lifting fixed claw plug 9 is called the top-lifting fixed claw plug plug 59; the top-lifting fixed claw plug plug 59 is divided into three parts, the gap between the upper and lower parts is a part of the top-lifting fixed claw plug joint 61, and a plurality of top-lifting fixed claw plug joint pages 67 are arranged behind the top-lifting fixed claw plug joint 61; a cylindrical top-lifting fixed claw plug writing claw rod through hole 63 is arranged in the center of the top-lifting fixed claw plug base 109 and the top-lifting fixed claw plug plug 59 in the front-to-back direction; the top-lifting fixed claw plug plug surface concave 69 is a groove on the surface of the top-lifting fixed claw plug plug 59, one on each of the upper and lower surfaces of the top-lifting fixed claw plug plug 59, and the depth is 1 / 6 of the width of the top-lifting fixed claw plug base 109 in the upper and lower directions; on the surface of the top-lifting fixed claw plug plug 59, except for the surface of the two top-lifting fixed claw plug plug surface concave 69 It is a curved surface concave inwards, and the rest of the surfaces are curved surfaces protruding outwards; the front edge seam 10 of the fixed claw body where the top fixed claw plug 9 is inserted is composed of the front edge seam upper lip 55, the front edge seam opening 56, and the front edge seam lower lip 57. The front edge seam upper lip 55 is the part corresponding to the top fixed claw plug plug 59 after the front edge of the fixed claw body belly wall 19 is inserted into the top fixed claw plug plug 59, and the lower surface protrudes downward to form an arc shape, while the rest of the part is concave upward to form an arc shape; the front edge seam lower lip 57 is the part corresponding to the bottom of the top fixed claw plug plug 59 after the front edge of the fixed claw body belly wall 19 is inserted into the top fixed claw plug plug 59, and the upper surface protrudes upward to form an arc shape, while the rest of the part is concave downward to form an arc shape; the front edge seam opening 56 is the space between the front edge seam upper lip 55 and the front edge seam lower lip 57. .

[0012] The bottom of the fixed plate slide groove 4 is fixed to the inner surface of the lower wall of the belly wall 19 of the fixed claw body by a fixing groove bolt 110. There are 6 fixed plate slide grooves 4 in total, which are of the same size and structure and are symmetrically arranged on both sides of the central bracket 23 in the adjustable fixed groove 15. The three fixed plate slide grooves 4 on one side are parallel to each other and staggered in front and back. The spacing between the midpoints of the three fixed plate slide grooves 4 is half the length of the fixed plate slide groove 4. The six fixed plate slide grooves 4 form 3 rows, which are distributed from front to back as the first row, the second row and the third row; when setting, the midpoint of the movable claw plate 8 in the fixed plate slide groove 4 coincides with the midpoint of the fixed plate slide groove 4, and the midpoints of the fixed plate slide grooves 4 in the first and second rows are A push plate wheel 5 is arranged between the two rows, and the push plate wheel shaft 85 of the push plate wheel 5 is located in front of the midpoint of the second row of fixed plate chute 4. An adjusting claw wheel 7 is arranged between the second and third rows of fixed plate chute 4, and the adjusting claw wheel shaft 105 of the adjusting claw wheel 7 is located in front of the midpoint of the third row of fixed plate chute 4. The fixed groove bolt 110 is composed of a fixed groove bolt nut 80 and a fixed groove bolt screw 81, which is made of manganese steel. The upper end of the fixed groove bolt screw 81 is enlarged, and the upper end periphery of the enlarged fixed groove bolt screw 81 is a regular hexagon with a thickness of 1-2 mm. The middle part of the groove bolt screw 81 is cylindrical, with a smooth surface and no threads, and the diameter of the cross-sectional circle is 2.8-4.8 mm, the middle part of the slot bolt screw 81 is the part inside the slot bolt through-hole 82 when the fixed slot bolt 110 passes through the fixed slot bolt through-hole 82 and the lower wall of the belly wall 19 of the fixed claw body and is tightened, and the peripheral wall is close to the inner wall of the fixed slot bolt through-hole 82; the lower part of the slot bolt screw 81 is cylindrical, and the surface has a thread that can mesh with the thread on the inner surface of the fixed slot bolt nut 80, which is the part that meshes with the fixed slot bolt nut 80 when the fixed slot bolt 110 passes through the fixed slot bolt through-hole 82 and the lower wall of the belly wall 19 of the fixed claw body and is tightened; the inner surface of the fixed slot bolt nut 80 has a thread, and the outer surface is a regular hexagon, the height of the fixed slot bolt nut 80 is 3-5 mm, and the thickness of the wall of the fixed slot bolt nut 80 at the midpoint of the regular hexagon is 2-3 mm; after the fixed slot bolt nut 80 is tightened, the fixed slot The length of the lower end of the bolt screw 81 protruding from the fixed groove bolt nut 80 is 1 mm; there are multiple fixed groove bolt through holes 82, which are evenly spaced and arranged in the center of the bottom wall 79 of the fixed plate slide, and the diameter of the cross-sectional circle of the fixed groove bolt through holes 82 is 3-5 mm; each fixed plate slide 4 is composed of a fixed plate slide slot mouth 72, a fixed plate slide slot wall 73, and a fixed plate slide slot cavity 74. The cross-section of the fixed plate slide 4 is a square as a whole. The wall outside the fixed plate slide 4 is the fixed plate slide slot wall 73, and the cavity surrounded by the fixed plate slide slot wall 73 is the fixed plate slide slot cavity 74. The wall at the bottom and center of the fixed plate slide 4 with the fixed groove bolt through holes 82 is specially called the fixed plate slide slot bottom wall 79, and a fixed plate slide slot mouth 72 with a width of 3-5 mm is arranged in the center of the top wall of the fixed plate slide 4, so that the movable claw plate 8 can slide left and right in the fixed plate slide slot mouth 72 The bottom wall and top wall thickness of the fixed plate slide 4 are the same, both of which are 3-5 mm, and the walls around them are relatively thin, with a thickness of 2-3 mm; the moving claw plate 8 is a structure in which the lower end is fixed by the fixed plate slide 4 and can move left and right in the fixed plate slide cavity 74 along the fixed plate slide mouth 72, and is composed of a moving claw plate top side edge tooth 70, a moving claw plate body 71, a blocking wheel nut 75, a moving claw plate pulley central hole 76, a moving claw plate pulley shaft 77, and a moving claw plate pulley 78. The moving claw plate body 71 is the main body in the center of the moving claw plate 8, which is made of copper, stainless steel or aluminum alloy and is in the shape of a rectangular parallelepiped. The length of the moving claw plate body 71 is 3-10 cm, the width is 1.5-5 cm, and the thickness is 2.8-4.8 mm; the upper part of the front and rear sides of the moving claw plate body 71 is provided with a moving claw plate top side edge tooth 70, and each moving The size and function of the claw plate top side edge teeth 70 are the same as those of the push plate wheel edge teeth 94 and the adjusting claw wheel teeth 104. The only difference is that all the movable claw plate top side edge teeth 70 are arranged on a plane, while the push plate wheel edge teeth 94 and the adjusting claw wheel teeth 104 are arranged on a cylindrical surface; the lower part of the movable claw plate body 71 located in the fixed plate slide groove cavity 74 is provided with a plurality of movable claw plate pulley central holes 76 for the movable claw plate pulley shaft 77 to pass through, the diameter of the cross-sectional circle of the movable claw plate pulley central hole 76 is 1-2 mm, the central axis of all the movable claw plate pulley central holes 76 is located in a plane, and the central axis spacing of two adjacent movable claw plate pulley central holes 76 is equal, both 10 mm; the movable claw plate pulley shaft 77 is made of manganese steel, cylindrical, and the diameter of the cross-sectional circle is 0.98-1.98mm, the distance between the two ends and the inner surface of the two side walls of the fixed plate slide groove wall 73 is 0.1-0.2mm, and the outer surfaces of both ends are threaded; the movable claw plate pulley 78 is made of manganese steel, and multiple movable claw plate pulleys 78 are arranged between the center and the outer surface of the movable claw plate pulley shaft 77, so that the movable claw plate pulley 78, the steel ball and the movable claw plate pulley shaft 77 together form a bearing structure; the diameter of the blocking wheel nut 75 is half of the diameter of the movable claw plate pulley 78, and the thickness is 1 / 5-1 / 4 of the thickness of the movable claw plate pulley 78.

[0013] The beneficial effects of the present invention are as follows: the adjustable erasable grid device for teaching and writing Russian letters on a blackboard utilizes 7 writing claws arranged at the front of the fixed claw body, cooperates with the fixed claw plug and the top fixed claw plug, and uses the corresponding relationship between the red horizontal line liquid surface in the horizontal line liquid box and the scale line to independently and guidedly draw 5 horizontal lines or oblique lines with an angle of 55° between the vertical direction and the horizontal line, and finally, wipe off the extra lines above the first horizontal line and below the fifth horizontal line with a wet cloth, so as to achieve the purpose of drawing the required grid lines on the blackboard quickly, regularly, beautifully and beautifully, and to be used for the purpose of writing Russian letters when teaching Russian letters on a blackboard. The adjustable erasable grid device for teaching and writing Russian letters on a blackboard is simple to make, highly operable, low cost and has obvious effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention is further described below in conjunction with the accompanying drawings.

[0015] Figure 1 The present invention is a schematic diagram of the overall structure of an adjustable and erasable grid device for teaching and writing Russian letters on a blackboard.

[0016] Figure 2 The present invention is a schematic diagram of the longitudinal section structure of the writing claw head of the adjustable and erasable grid-punching device for teaching and writing Russian letters on a blackboard.

[0017] Figure 3 The present invention is a schematic diagram of the overall structure of the fixed claw plug of the adjustable and erasable grid device for teaching and writing Russian letters on a blackboard.

[0018] Figure 4 The present invention is a schematic diagram of the overall structure of the top-lifting and fixing claw plug of the adjustable and erasable grid-punching device for teaching and writing Russian letters on a blackboard.

[0019] Figure 5 The present invention is a schematic diagram of the longitudinal section structure of the side edge teeth of the movable claw plate of the adjustable and erasable grid device for teaching and writing Russian letters on a blackboard.

[0020] Figure 6 The present invention is a schematic diagram of the force generation and transmission structure of the control wheel of the adjustable and erasable grid device for teaching and writing Russian letters on a blackboard, and the positional relationship between the various structures.

[0021] Figure 7 The present invention is a schematic diagram of the connection relationship between the push plate wheel and the adjacent structures of the movable claw plate of the adjustable and erasable grid device for teaching and writing Russian letters on a blackboard.

[0022] Figure 8 The present invention is a schematic diagram of the connection relationship between the adjusting claw wheel and the adjacent structures of the moving claw plate of the adjustable and erasable grid device for teaching and writing Russian letters on a blackboard.

[0023] Fig. 9 The present invention is a structural schematic diagram of a horizontal line liquid box and a horizontal line liquid box fixing ring of an adjustable and erasable grid device for teaching and writing Russian letters on a blackboard, which are fixedly connected to each other.

[0024] Fig.10 The present invention is a schematic diagram of a writing example of the adjustable and erasable grid device for teaching and writing Russian letters on a blackboard.

[0025] In the figure, 1. writing claw, 2. fixed claw body, 3. fixed claw plug, 4. fixed plate slide groove, 5. push plate wheel, 6. control grip wheel, 7. adjustable claw wheel, 8. movable claw plate, 9. top fixed claw plug, 10. front edge seam of fixed claw body, 11. fixed claw body belly, 12. fixed claw body handle, 13. horizontal line liquid box, 14. fixed claw body frame, 15. distance adjustment fixed groove, 16. writing claw rod, 17. writing claw head, 18. fixed claw body belly cavity, 19. fixed claw body belly wall, 20. fixed claw body handle cavity, 21. fixed claw body handle wall, 22. side bracket, 23. central bracket, 24. intermediate bracket, 25. oblique bracket, 26. chalk, 27. pen insertion port, 28. fixed pen holder outer wall, 29. fixed pen holder inner wall, 30. fixed pen holder cavity, 31. push pen rod head surrounding cavity, 32. fixed rod bead cavity, 33. . Push rod bead spring, 34. Rod bead, 35. Rod bead groove, 36. Push pen rod, 37. Push pen rod perforation, 38. Push pen rod groove, 39. Push pen rod head plate, 40. Push pen rod non-groove portion, 41. Push pen rod bottom plate, 42. Push pen rod bottom plate cushion, 43. Push pen rod bottom plate body, 44. Writing claw rod base plate, 45. Writing claw rod fixed axis, 46. Writing claw rod movable seam, 47. Claw plug plug, 48. Claw plug joint seam, 49. Claw plug base bottom, 50. Claw plug writing claw rod perforation, 51. Claw plug fixed seam, 52. Claw plug base top, 53. Claw plug fixed seam page, 54. Claw plug plug surface concave, 55. Front edge seam upper lip, 56. Front edge seam, 57. Front edge seam lower lip, 58. Lifting claw plug base Upper part, 59. Lifting claw plug plug, 60. Lifting claw plug base lower part, 61. Lifting claw plug joint, 62. Lifting rod spring, 63. Lifting claw plug writing claw rod perforation, 64. Lifting claw plug top block, 65. Lifting claw plug top block side seam, 66. Lifting claw plug fixed seam, 67. Lifting claw plug joint page, 68. Ligament of lifting claw plug top block, 69. Lifting claw plug plug surface concave, 70. Moving claw plate top side edge teeth, 71. Moving claw plate body, 72. Fixed plate slide groove mouth, 73. Fixed plate slide groove wall, 74. Fixed plate slide groove cavity, 75. Blocking wheel nut, 76. Moving claw plate pulley central hole, 77. Moving claw plate pulley shaft, 78. Moving claw plate pulley, 79. Fixed plate slide groove bottom wall, 80. Fixed groove bolt nut, 81. Fixed groove bolt screw, 82. Bolt holes for fixing grooves, 83. Push plate wheel, 84. Push plate wheel, 85. Push plate wheel shaft, 86. Control grip wheel inner wheel, 87. Control grip wheel outer wheel, 88. Fixed chain wheel body, 89. Fixed chain wheel shaft, 90. Guide chain, 91. Control grip wheel shaft, 92. Control grip wheel crank convex, 93. Control grip wheel crank, 94. Push plate wheel rim teeth, 95. Fixed chain wheel, 96. Red horizontal line liquid, 97. Horizontal line liquid box fixed ring, 98. Fixed ring screw, 99. Horizontal line liquid box fixed ring body, 100. Horizontal line liquid box cavity, 101. Horizontal line liquid box wall, 102. Push pen rod head leaf spring, 103. Adjust claw wheel disc, 104. Adjust claw wheel teeth, 105. Adjust claw wheel shaft, 106. Horizontal marking line, 107. Oblique 55° marking line, 108.The base of the fixed claw plug, 109. The base of the lifted fixed claw plug, 110. The fixed groove bolt. DETAILED DESCRIPTION

[0026] Embodiment 1:

[0027] As shown in the figure, the adjustable erasable grid device for teaching and writing Russian letters on a blackboard of the present invention comprises a writing claw 1, a fixed claw body 2, a fixed claw plug 3, a fixed plate slide groove 4, a push plate wheel 5, a control gripping wheel 6, an adjusting claw wheel 7, a movable claw plate 8, a top fixed claw plug 9, a front edge seam 10 of a fixed claw body, a fixed claw body belly 11, a fixed claw body handle 12, a horizontal line liquid box 13, an inner frame of a fixed claw body 14, a distance adjusting fixed groove 15, a writing claw rod 16, a writing claw head 17, a fixed claw body belly cavity 18, a fixed claw body belly wall 19, a fixed claw body handle cavity 20, a fixed claw body handle wall 21, a connecting bracket 22, a central bracket 23, an intermediate bracket 24, an oblique bracket 25, a chalk 26, a pen insertion port 27, a fixed pen holder outer wall 28, a fixed pen holder inner wall 29, a fixed pen holder cavity 30, and a push pen rod head surrounding cavity 31 , a rod bead cavity 32, a rod bead spring 33, a rod bead 34, a rod bead groove 35, a pen pusher 36, a pen pusher through hole 37, a pen pusher groove 38, a pen pusher head plate 39, a pen pusher grooveless portion 40, a pen pusher bottom plate 41, a pen pusher bottom plate cushion 42, a pen pusher bottom plate body 43, a writing claw rod base plate 44, a writing claw rod fixed axis 45, a writing claw rod movable seam 46, a fixed claw plug plug 47, a fixed claw plug joint seam 48, a fixed claw plug base lower part 49, a fixed claw plug writing claw rod through hole 50, a fixed claw plug fixed connection seam 51, a fixed claw plug base upper part 52, a fixed claw plug fixed connection seam page 53, a fixed claw plug plug surface concave 54, a front edge seam upper lip 55, a front edge seam opening 56, a front edge seam lower lip 57, a top fixed claw plug base upper part 58, The plug of the top fixed claw plug 59, the lower part of the base of the top fixed claw plug 60, the joint of the top fixed claw plug 61, the top rod spring 62, the writing claw rod through hole 63 of the top fixed claw plug, the top block of the top fixed claw plug 64, the side seam of the top fixed claw plug top block 65, the fixed joint seam of the top fixed claw plug 66, the joint page of the top fixed claw plug 67, the ligament of the top fixed claw plug top block 68, the plug surface concave 69 of the top fixed claw plug, the top side edge teeth 70 of the movable claw plate, the movable claw plate body 71, the fixed plate slide groove mouth 72, the fixed plate slide groove wall 73, the fixed plate slide groove cavity 74, the wheel blocking nut 75, the central hole of the movable claw plate pulley 76, the movable claw plate pulley shaft 77, the movable claw plate pulley 78, the bottom wall of the fixed plate slide groove 79, the fixed groove bolt nut 80, the fixed groove bolt screw 81, the fixed groove bolt through hole 82, the push plate wheel The cam body 84 of the push plate wheel is made up of a wheel 83, a push plate wheel small wheel 84, a push plate wheel shaft 85, a control grab wheel inner wheel 86, a control grab wheel outer wheel 87, a fixed chain wheel body 88, a fixed chain wheel shaft 89, a guide chain 90, a control grab wheel shaft 91, a control grab wheel crank handle cam 92, a control grab wheel crank handle 93, a push plate wheel rim teeth 94, a fixed chain wheel 95, a red horizontal line liquid 96, a horizontal line liquid box fixing ring 97, a fixing ring screw 98, a horizontal line liquid box fixing ring body 99, a horizontal line liquid box cavity 100, a horizontal line liquid box wall 101, a pen pusher head leaf spring 102, an adjusting claw wheel disc 103, adjusting claw wheel teeth 104, an adjusting claw wheel shaft 105, a horizontal marking line 106, an oblique 55° marking line 107, a fixed claw plug base 108, a top fixed claw plug base 109, and a fixing groove bolt 110. The writing claw 1 inserts the chalk 26 from the pen insertion port 27 at the lower end, and the chalk 26 is fixed in the pen holder cavity 30. When making a grid on the blackboard,The chalk 26 can be used to draw lines on the blackboard. There are 7 writing claws 1 in total, and the spacing between two adjacent writing claws 1 is equal. There are two situations when drawing lines in a grid. One is to draw 5 lines in the horizontal direction. At this time, the top fixed claw plugs 9 of the second and sixth writing claws 1 are not tightly plugged. In this way, the writing claw rod 16, under the action of the top rod spring 62, pushes up the writing claw rod 16 and the top fixed claw plug top block 64, so that the two writing claws 1 are pushed up and leave the plane where the lower ends of the other 5 writing claws 1 are located. When drawing lines in a grid, the liquid level of the red horizontal line liquid 96 in the horizontal line liquid box 13 coincides with the horizontal mark 106, and the plane where the lower ends of the other 5 writing claws 1 are located can be parallel to the horizontal mark 106, thereby ensuring that the 5 drawn lines are horizontal and will not bend or tilted. , the five lines drawn at one time can form the shape required for the Russian letter grid in the horizontal direction, that is, the vertical direction is divided into three equal parts, and the middle part is divided into two from the middle; the second is to draw an oblique line with an angle of 55° between the vertical direction and the horizontal direction. At this time, the top fixing claw plugs 9 of the second and sixth writing claws 1 are plugged tightly, so that the top rod spring 62 under the writing claw rod 16 is pressed down by the writing claw rod 16, and the lower ends of the second and sixth writing claws 1 and the lower ends of the other five writing claws 1 are in the same plane; next, the entire blackboard Russian letter teaching and writing adjustable and erasable grid device is rotated 55° to the right, so that the liquid level of the red horizontal line liquid 96 coincides with the oblique 55° marking line 107, and at the same time, the oblique 55° marking line 1 is visually observed. 07 is always parallel to the 5 horizontal lines just drawn, so as to draw 7 parallel lines with equal spacing at the same time, and draw the multiple lines needed to be drawn during teaching and writing completely; finally, wipe off the extra lines above the 1st horizontal line and below the 5th horizontal line with a wet cloth, and the required grid lines can be drawn on the blackboard quickly, regularly, beautifully and beautifully, which can be used when teaching Russian letters on the blackboard and writing Russian letters; each writing claw 1 is composed of a writing claw rod 16 and a writing claw head 17, and each writing claw head 17 includes chalk 26, a pen insertion port 27, a fixed pen barrel outer wall 28, a fixed pen barrel inner wall 29, a fixed pen barrel cavity 30, a pen rod head surrounding cavity 31, a fixed rod bead cavity 32, a pushed fixed rod bead spring 33, a fixed rod bead 34, The fixing rod bead groove 35, the push pen rod 36, the push pen rod perforation 37, the push pen rod groove portion 38, the push pen rod head plate 39, the push pen rod non-groove portion 40, the push pen rod bottom plate 41, the push pen rod bottom plate cushion 42, the push pen rod bottom plate body 43, the writing claw rod base plate 44, the writing claw rod fixed shaft 45, the writing claw rod movable seam 46 and the push pen rod head leaf spring 102, the chalk 26 is a commercially available dust-free chalk, which is a white precipitate that is not easy to decompose, and the particles are larger than dust. If various pigments are added, it can also be made into colored chalk; the chalk 26 is a tool widely used in daily life, generally used for writing on a blackboard, and the chalk 26 is a dust-free chalk made of calcium carbonate limestone, calcium sulfate plaster of Paris, polyvinyl alcohol, polypropylene glycol, metal oxides, glycerin and water; when making,Choose a mold with a circular cross-section, first dissolve the glycerin, polypropylene glycol, metal oxide, and polyvinyl alcohol in the formula with water, heat appropriately if necessary, and stir well for later use; then, use a brush to apply a release agent to the inside of the mold, and the mold should be placed flat with the large hole facing upward; the release agent is made by dissolving 3 parts of stearic acid in 100 parts of diesel or kerosene; next, mix the powders, add the solution prepared at the beginning, stir into a paste, and then pour into the mold; because gypsum coagulates quickly when it comes into contact with water, the action must be fast; the mold should be vibrated while pouring, and the excess slurry should be scraped off after it is filled, and it can be demolded in about 4-5 minutes; after demolding, turn the mold over with the large hole facing downward, use a piece of wooden board with nails to aim at the small end of the chalk, and tap it a few times to make the formed chalk come out; finally, dry it in the sun or dry it at 80℃, and then pack it. The chalk 26 is 75 mm long, 10.2 mm in diameter at the big end and 8.5 mm in diameter at the small end. When the chalk 26 is installed and used in the adjustable erasable grid device for teaching and writing Russian letters on the blackboard, the big end is inserted into the pen holder cavity 30 from the pen insertion port 27. When the big end is inserted into the lower surface of the lower plate of the push pen rod head plate 39, the chalk 26 is exposed at the lower end of the writing claw head 17 by 5-10 mm. When the adjustable erasable grid device for teaching and writing Russian letters on the blackboard is operated, the chalk 26 can draw lines on the blackboard to form the grid lines required for teaching and writing Russian letters. The pen insertion port 27 is an opening in the center of the lower end surface of the writing claw head 17, which is circular and has a diameter of 9-10 mm, which is slightly smaller than the diameter of the big end of the chalk 26. 7 is surrounded by a latex elastic solid pen barrel inner wall 29, where the thickness of the solid pen barrel inner wall 29 is 1 mm. Since the diameter of the pen insertion port 27 is slightly smaller than the diameter of the big end of the chalk 26, the solid pen barrel inner wall 29 around the pen insertion port 27 is elastic. When the chalk 26 is inserted into the solid pen barrel cavity 30 from the pen insertion port 27, it can be firmly fixed in the writing claw head 17 to ensure that the chalk 26 will not fall off from the lower end of the writing claw head 17 when drawing lines; the solid pen barrel inner wall 29 is located on the inner side of the solid pen barrel outer wall 28, and the space enclosed by the solid pen barrel inner wall 29 is the solid pen barrel cavity 30 for holding the upper part of the chalk 26; the solid pen barrel inner wall 29 is latex, elastic, and has a thickness of 1-2.5 mm. In the surrounding walls of the solid pen barrel outer wall 28, from bottom to top, the solid pen barrel cavity 30 is formed. The thickness of the inner wall 29 of the pen barrel gradually decreases, the thickness at the lower end is 2.5 mm, and the thickness at the upper end is 1 mm; the outer wall 28 of the solid pen barrel is the outer wall of the writing claw head 17, which is made of copper, stainless steel or aluminum alloy, and is composed of a surrounding wall, a bottom wall and a top wall. The thickness of the surrounding walls of the solid pen barrel outer wall 28 is 0.5-5 mm, the height is 60-65 mm, and the thickness is equal in the upper and lower directions. The diameter of the cylindrical inner cavity surrounded by it is 15 mm; the thickness of the bottom wall of the solid pen barrel outer wall 28 is 1-2 mm, a circular hole is set in the center, the diameter of the circular hole is 11-12 mm, and the inner surface is lined with a solid pen barrel inner wall 29 with a thickness of 1 mm. The circular hole formed in the center of the solid pen barrel inner wall 29 is the pen insertion port 27; the thickness of the top wall of the solid pen barrel outer wall 28 is 5-20 mm,A circular hole is set in the center, which is called the push pen rod through hole 37. The diameter of the push pen rod through hole 37 is 2-5 mm, and the inner surface is smooth. It is the channel for the push pen rod 36 to pass through; in this way, the upper end of the entire fixed pen barrel cavity 30 is connected to the outside world through the push pen rod through hole 37, and the lower end is connected to the outside world through the pen insertion port 27; the push pen rod head surrounding cavity 31 is the part of the upper end of the fixed pen barrel cavity 30 that holds the push pen rod head plate 39 and the push pen rod head leaf spring 102, and is a part of the fixed pen barrel cavity 30. As the line is drawn, the chalk 26 will continue to be worn and shortened. Pressing down the push pen rod bottom plate 43 can ensure that the remaining chalk 26 is always in a firmly fixed state, and the space occupied by the push pen rod head surrounding cavity 31 gradually increases. In other words, as long as the chalk 26 The space above the big head is the push pen rod head surrounding cavity 31; the fixed rod bead cavity 32 is a cylindrical groove for fixing the fixed rod bead 34, there are 2 in total, symmetrically arranged on a straight line of a circular structure passing through the central axis of the push pen rod 36, the diameter of each fixed rod bead cavity 32 is 1 mm, and the depth is 3-5 mm; the pushing fixed rod bead spring 33 is made of spring steel, with a diameter of 0.95 mm and a length of 2.5-4.5 mm, which can push nearly half of the fixed rod bead 34 away from the opening exposing the fixed rod bead cavity 32, and when it reaches the fixed rod bead groove 35 of the push pen rod groove 38, the fixed rod bead 34 is pushed into the cavity formed by the fixed rod bead groove 35 and the fixed rod bead cavity 32, so that the fixed rod bead 34 plays a blocking role to ensure that the push pen rod 36 can no longer move up and down When the user finds that the length of the chalk 26 that is worn out and the writing claw 17 is too short, the user can press down the push rod 36 to push the fixing rod ball 34 into the fixing rod ball cavity 32, and the push rod 36 can move down along the push rod through hole 37 to push the chalk 26 out of the pen insertion port 27 and present a suitable length again; the push rod 36 is composed of a push rod groove portion 38, a push rod head plate 39, a push rod non-groove portion 40, and a push rod bottom plate 41. The push rod 36 is a structural component for pushing the chalk 26 out of the pen insertion port 27 and the fixing pen barrel cavity 30; the push rod 36 is composed of a push rod bottom plate 41, a push rod non-groove portion 40, a push rod groove portion 38, and a push rod head plate 39 from top to bottom; the push rod bottom plate 41 is the expanded part at the upper end of the push rod 36, which is round The pen pusher bottom plate 41 is cylindrical, with a diameter of 10-15 mm and a height of 5-10 mm, and is composed of a pen pusher bottom plate cushion 42 and a pen pusher bottom plate body 43; the pen pusher bottom plate cushion 42 is the upper part of the pen pusher bottom plate 41, which is made of silicone and has a thickness of 3-6 mm, and is used to prevent the reaction force of the pen pusher bottom plate 41 from scratching the hand when the pen pusher 36 is pressed down; the pen pusher bottom plate body 43 is made of copper, stainless steel or aluminum alloy, with a thickness of 2-4 mm, and the upper surface is adhered to the pen pusher bottom plate cushion 42 by an adhesive, and the center of the lower surface is welded to the upper end of the pen pusher grooveless portion 40; the pen pusher grooveless portion 40 is made of copper, stainless steel or aluminum alloy, with a smooth surface, no rod fixing bead groove 35, and a circular cross section.The diameter is 1.95-4.95 mm and the length is 10-20 mm; the push pen rod groove portion 38 is a portion where two fixed rod bead grooves 35 are symmetrically arranged on the surface below the push pen rod grooveless portion 40. The upper end of the push pen rod groove portion 38 is connected to the push pen rod grooveless portion 40 to form a whole, and the lower end is welded to the center of the upper surface of the upper plate of the push pen rod head plate 39. As the chalk 26 wears, the push pen rod 36 is manually pushed down, and the fixed rod bead 34 arrives at different fixed rod bead grooves 35 to play the role of the push pen rod 36; the fixed rod bead 34 is made of manganese steel, spherical, and has a diameter of 0.95 mm; the fixed rod bead groove 35 is hemispherical, with a diameter of 1 mm, and is symmetrically arranged on the outer surface of the push pen rod groove portion 38. After being installed on the writing claw head 17, the two symmetrically arranged The central axis of each solid rod bead groove 35 and the central axis of the solid rod bead cavity 32 are in the same plane. On the surface of the push pen rod groove portion 38, the upper and lower adjacent solid rod bead grooves 35 are 5 mm apart, that is, the lower edge of the upper solid rod bead groove 35 is 5 mm away from the upper edge of the lower solid rod bead groove 35; the push pen rod head plate 39 is the structure of the lower end of the push pen rod 36, which is composed of an upper plate, a push pen rod head leaf spring 102 and a lower plate. The upper plate of the push pen rod head plate 39 is made of manganese steel and is in the shape of a disc. The diameter of the circular push pen rod head plate 39 upper plate is 8.5 mm and the thickness is 1 mm; the push pen rod head leaf spring 102 is made of spring steel, with a diameter of 6-7 mm and a height of 3-5 mm. The upper end is welded to the lower surface of the upper plate of the push pen rod head plate 39, and the lower end is welded to the upper surface of the lower plate of the push pen rod head plate 39. Surface; the lower plate of the push pen head plate 39 is manganese steel, in the shape of a disc, the diameter of the circular push pen head plate 39 is 8.5 mm, the thickness of 1 mm; the fixed writing claw rod substrate 44 is a structure in which the writing claw rod 16 and the writing claw head 17 are connected together, made of copper, stainless steel or aluminum alloy, a total of 2 pieces, arranged in parallel, the two fixed writing claw rod substrates 44 are 5-10 mm apart, each fixed writing claw rod substrate 44 is semicircular in longitudinal section, with a diameter of 15-30 mm and a thickness of 1-2 mm; the fixed writing claw rod substrate 44 is welded to the outer surface of the surrounding wall of the fixed pen barrel 28 along the upper and lower directions, and a circular hole with a diameter of 3-5 mm is provided in the center of the fixed writing claw rod substrate 44 for passing the writing claw rod fixed shaft 45 The writing claw rod 16 and the writing claw head 17 are connected together movably along the writing claw rod fixed axis 45; the writing claw rod fixed axis 45 is made of manganese steel, cylindrical, and has a diameter of 3-5 mm. After being inserted into the central circular hole of the fixed writing claw rod substrate 44, the outer surface of the central part is welded and fixed to the outer end of the writing claw rod 16; the writing claw rod 16 is made of manganese steel, cylindrical, and has a diameter of 4-8 mm. The lower surface 5-10 mm away from the inner end is welded to the top surface of the moving claw plate 8, so that the central axis of the writing claw rod 16 is perpendicular to the plane where the inner and outer surfaces of the moving claw plate 8 are located; the writing claw rod movable seam 46 is the gap between the outer end of the writing claw rod 16 and the outer surface of the surrounding walls of the fixed pen holder outer wall 28. Due to the setting of the writing claw rod movable seam 46,In addition, the writing claw rod fixing shaft 45 can rotate in the circular hole in the center of the fixed writing claw rod base plate 44, so that when writing, the entire writing claw head 17 has a certain rotation ability, but the rotation range is small, thereby ensuring that the chalk 26 can smoothly draw lines on the blackboard without bending or breaking due to excessive fixation. The horizontal line liquid box 13 uses gravity to allow the liquid level of the red horizontal line liquid 96, which is half the volume of the horizontal line liquid box chamber 100, to change in real time as the entire blackboard Russian alphabet teaching and writing adjustable erasable grid punching device is tilted during the grid punching operation. The operator adjusts the entire blackboard Russian alphabet teaching and writing adjustable erasable grid punching device at any time according to the overlap of the liquid level of the red horizontal line liquid 96 and the horizontal marking line 106 or the oblique 55° marking line 107 marked on the horizontal line liquid box 13, so as to keep the liquid level of the red horizontal line liquid 96 coincident with the horizontal marking line 106 or the oblique 55° marking line 107 marked on the horizontal line liquid box 13 at any time, so as to draw regular lines on the blackboard. The horizontal line liquid box 13 is hemispherical, with a diameter of 5-10 cm, and is disposed in the center of the outer surface of the upper wall of the solid claw body belly wall 19; the horizontal line liquid box wall 101 is the outer wall of the horizontal line liquid box 13, which is a transparent plastic or glass material with a thickness of 1-2 mm, and the cavity surrounded by the horizontal line liquid box wall 101 is the horizontal line liquid box cavity 100, and the horizontal line liquid box cavity 100 is filled with the red horizontal line liquid 96 and then sealed without any opening to ensure that the red horizontal line liquid 96 does not overflow; the red horizontal line liquid 96 is prepared from three kinds of pigments and water, and the ratio of the three kinds of pigments is: bright red: light yellow: fluorescent orange = 10:3:2, the bright red pigment Carmine is used, lead chrome yellow, iron yellow, strontium calcium yellow, transparent yellow or benzidine yellow are used as light yellow pigments, and AF555 succinimide ester or trisulfonic acid-Cy3.5-carboxylic acid is used as fluorescent orange-red pigments; the amount of red horizontal line liquid 96 added is half of the volume of the horizontal line liquid box cavity 100; after the red horizontal line liquid 96 is added, the outer surface of the horizontal line liquid box wall 101 is marked with a level to make a horizontal mark 106 and a 55° oblique mark 107; when the liquid level coincides with the marked horizontal line, the outer surface of the horizontal line liquid box wall 101 is marked with a level to make a horizontal mark 106; then the entire blackboard is clockwise erased with an adjustable erasable eraser. The grid device rotates 55°, and the plane where the liquid level is located at this time is marked with lines on the outer surface of the horizontal liquid box wall 101, forming an oblique 55° mark 107; the horizontal liquid box solid ring 97 is a structure that fixes the horizontal liquid box 13 to the center of the outer surface of the upper wall of the solid claw body belly wall 19, and is made of copper, stainless steel or aluminum alloy, in a circular shape. The circular ring body is the horizontal liquid box solid ring body 99, and the thickness of the horizontal liquid box solid ring body 99 is 0.5-1 mm. The outer half of the cross section of the horizontal liquid box solid ring body 99 is a straight line, and the inner half is an arc shape, and the inner half is just stuck on the outer surface of the lower edge of the horizontal liquid box wall 101.3-4 fixing ring screws 98 are arranged at equal angles in the center of the outer side of the horizontal line liquid box fixing ring body 99. After the horizontal line liquid box fixing ring 97 is put on the horizontal line liquid box 13, the fixing ring screws 98 can be used to put the horizontal line liquid box 13 on the horizontal line liquid box fixing ring 97 and fix the horizontal line liquid box 13 in the center of the outer surface of the upper wall of the fixed claw body belly wall 19.

[0028] The fixed claw body 2 is a structure that fixes and adjusts the writing claw 1 and facilitates the operator to hold the entire blackboard Russian alphabet teaching and writing adjustable and erasable grid device to draw lines and grids on the blackboard, and is in the shape of a handle brush; the fixed claw body 2 is divided into two parts, front and back, the front half of the fixed claw body 2 is a fixed claw body belly 11, which is used to fix and connect the 7 writing claws 1 at equal intervals; the back half of the fixed claw body 2 is a fixed claw body handle 12, and the fixed claw body handle 12 is a structure for the operator to hold the entire blackboard Russian alphabet teaching and writing adjustable and erasable grid device; the outer walls of the fixed claw body belly 11 and the fixed claw body handle 12 are connected to each other to form a whole, the cavities in the fixed claw body belly 11 and the fixed claw body handle 12 are connected together, and the outer wall of the fixed claw body belly 11 is the fixed claw body belly wall 19; the fixed claw body belly wall 1 9 is made of stainless steel or plastic with a thickness of 1-2 mm; the cavity surrounded by the belly wall 19 of the solid claw body is the belly cavity 18 of the solid claw body, and a horizontal line liquid box 13 is fixed in the center of the outer surface of the upper wall of the belly wall 19 of the solid claw body; the outer wall of the solid claw body handle 12 is the solid claw body handle wall 21, and the solid claw body handle wall 21 is made of stainless steel or plastic with a thickness of 1-2 mm; the cavity surrounded by the solid claw body handle wall 21 is the solid claw body handle cavity 20; the solid claw body belly cavity 18 and the solid claw body handle cavity 20 are provided with a part of the solid claw body frame 14, the distance adjustment fixed groove 15 and the writing claw rod 16; 6 fixed plate slide grooves 4 are fixed above the distance adjustment fixed groove 15, and a moving claw plate 8 is fixed in each fixed plate slide groove 4; the solid claw body 2 is composed of the front edge seam 10 of the solid claw body, the belly 11 of the solid claw body, the handle 12 of the solid claw The body frame 14, the distance adjustment fixed groove 15, the writing claw rod 16, the writing claw head 17, the solid claw body belly cavity 18, the solid claw body belly wall 19, the solid claw body handle cavity 20, the solid claw body handle wall 21, the connecting bracket 22, the central bracket 23, the intermediate bracket 24, and the oblique bracket 25 are composed; the front edge seam 10 of the solid claw body is a crack at the front edge of the solid claw body belly 11, which is formed by the front edges of the upper and lower parts of the solid claw body belly wall 19. The inner surface of the front edge seam 10 of the solid claw body has a semicircular groove, which is used to facilitate the insertion of the solid claw plug 3 and the top solid claw plug 9 to fix the writing claw rod 16 at the front edge seam 10 of the solid claw body; the front edge seam 10 of the solid claw body is connected to the left and right, so that the 7 writing claw rods 16 without the solid claw plug 3 and the top solid claw plug 9 can move left and right in the front edge seam 10 of the solid claw body to adjust the adjacent The spacing between the two writing claw rods 16; the inner frame 14 of the solid claw body is a support fixed inside the solid claw body 2, which is made of manganese steel and has a circular cross section. The diameter of the circular inner frame 14 of the solid claw body is 3-5 mm; according to different positions and functions, each inner frame 14 of the solid claw body is named as a connecting bracket 22, a central bracket 23, an intermediate bracket 24 and an oblique bracket 25; the central bracket 23 is the most central bracket of the entire solid claw body 2, which runs through the center of the solid claw body belly 11 and the solid claw body handle 12, and the front end of the central bracket 23 is welded to the top of the two oblique brackets 25 at the front end. At the same time, the rear end of the most central writing claw rod 16 is welded to the top of the front part of the central bracket 23; the rear end of the central bracket 23 is fixed to the center of the last connecting bracket 22 of the solid claw body handle 12;There are 4 oblique brackets 25, which are obliquely distributed in the belly cavity 18 of the solid claw body and are arranged along the edge of the belly cavity 18 of the solid claw body. There are 2 oblique brackets 25 in the front part of the belly cavity 18 of the solid claw body and 2 in the rear part. The 4 oblique brackets 25 constitute the support frame of the belly cavity 18 of the solid claw body; the side brackets 24 are located on both sides of the central bracket 23, and are parallel to the central bracket 23, and there are 3 pairs in total, which are respectively located at the central position between the central bracket 23 and the side bracket 24 at the edge of the belly cavity 18 of the solid claw body, 1 cm away from the central bracket 23, and at the edge of the belly cavity 18 of the solid claw body; the side brackets 24 located at the central position between the central bracket 23 and the side brackets 24 at the edge of the belly cavity 18 of the solid claw body are all located in the belly 11 of the solid claw body, and the side brackets 24 are located in the middle position between the central bracket 23 and the side brackets 24 at the edge of the belly cavity 18 of the solid claw body. The lower surface of the front end is welded to the frontmost connecting bracket 22, and the rear end of the side bracket 24 is welded to the center of the rear oblique bracket 25 in the belly cavity 18 of the solid claw body; the side bracket 24 at a distance of 1 cm from the central bracket 23 is adjacent to the central bracket 23, the lower surface of the front end of the side bracket 24 is welded to the frontmost connecting bracket 22, the lower surface of the central part of the side bracket 24 is welded to the rear oblique bracket 25, and the rear end of the side bracket 24 is welded to one end of the rear short connecting bracket 22; the front end of the side bracket 24 at the edge of the belly cavity 18 of the solid claw body is free, and the side surface 1 cm away from the free end is welded to the outer end of the front oblique bracket 25, and the rear end of the side bracket 24 is welded to The outer ends of the front connecting bracket 22 and the rear oblique bracket 25 are welded together; there are 2 connecting brackets 22, the front connecting bracket 22 is located at the rear edge of the distance adjustment fixed groove 15, and both ends extend to the rear end of the side bracket 24 at the edge of the belly cavity 18 of the solid claw body, and the rear connecting bracket 22 is located at the rear of the handle cavity 20 of the solid claw body, and the two ends are welded to the inner side of the side bracket 24 at a distance of 1 cm from the central bracket 23, and the center of the connecting bracket 22 is welded to the lower surface of the rear of the central bracket 23; the distance adjustment fixed groove 15 is a fixed groove for adjusting the distance between two adjacent writing claw rods 16, which is made of copper, stainless steel or aluminum alloy. The distance adjustment fixed groove 15 is in the shape of a rectangular parallelepiped, and the side walls at both ends in the length direction are welded and fixed to the solid claw The inner side of the side bracket 24 at the edge of the body belly cavity 18, the rear side wall is welded and fixed to the front of the front connecting bracket 22, and the front side wall is welded together with the front oblique bracket 25; in this way, the side bracket 24 and the oblique bracket 25 at the place where the adjustable fixed groove 15 is connected to it can be tightly connected and fixed together; the thickness of the plate used to make the adjustable fixed groove 15 is 1-2 mm, the adjustable fixed groove 15 has only four walls and a bottom wall, and no top wall, and 6 fixed plate chutes 4 and 6 moving claw plates 8 are fixed in the adjustable fixed groove 15, and the 6 fixed plate chutes 4 and 6 moving claw plates 8 are arranged in 3 rows in the front and back of the adjustable fixed groove 15, and each row has 2 symmetrically arranged fixed plate chutes 4 and moving claw plates 8, and the spacing between adjacent rows is equal;The inner ends of the two fixed plate slide grooves 4 in the first row are welded to the two side surfaces of the central bracket 23, so that the inner ends of the two fixed plate slide grooves 4 are close to each other, and a control grab wheel 6 is welded above the welding point of the three. The control grab wheel 6 is connected to the push plate wheels 5 on the left and right sides and the fixed chain wheels 95 at the outer ends of the two fixed plate slide grooves 4 through the guide chain 90. The front of the push plate wheel 5 is the moving claw plate 8 of the first row, and the back is the moving claw plate 8 of the second row. An adjusting claw wheel 7 is arranged between the moving claw plate 8 of the second row and the moving claw plate 8 of the third row. The size and structure of the push plate wheel 5 and the adjusting claw wheel 7 are the same. The operator needs to adjust the two adjacent writing When the distance between the claw rods 16 is adjusted, the control gripping wheel 6 is manually rotated to drive the force guide chain 90, thereby driving the push plate wheel 5 to move left and right. Due to the left and right movement of the push plate wheel 5, the movable claw plates 8 on both sides of the push plate wheel 5 are driven to move along the fixed plate slide groove 4. The movement of the movable claw plate 8 behind the push plate wheel 5 drives the adjustment claw wheel 7 to rotate, and then drives the movable claw plates 8 of the third row to move along the fixed plate slide groove 4. Since the writing claw rod 16 is welded above the movable claw plate 8, the movement of the movable claw plate 8 can drive the writing claw rod 16, and finally achieve the purpose of expanding or reducing the distance between two adjacent writing claw rods 16. ;

[0029] The push plate wheel 5 is located between the two movable claw plates 8 in the first row and the second row. When it rotates, it can push the movable claw plates 8 in the first row and the second row to move relative to each other. The push plate wheel 5 is connected to the control grip wheel 6 after being linked by the force guide chain 90. When the control grip wheel 6 is rotated, the push plate wheel 5 can be driven to rotate, thereby achieving the purpose of pushing the movable claw plate 8 to move along the fixed plate slide groove 4. The push plate wheel 5 is composed of a large push plate wheel wheel 83, a small push plate wheel wheel 84, and a push plate wheel shaft 85. The large push plate wheel wheel 83 and the small push plate wheel wheel 84 have push plate wheel rim teeth 94 on their peripheries. The structure and function of the push plate wheel rim teeth 94 are the same as the teeth on the periphery of the circular wheel at the pedal of the straight-line vehicle. The outer edges of all the push plate wheel rim teeth 94 form a streamlined curve, which can easily allow the push plate wheel rim teeth 94 to be inserted into the gap in the middle of the force guide chain 90, so as to achieve the purpose of meshing the wheel teeth with the force guide chain 90; The push plate wheel rim teeth 94 of the wheel small wheel 84 mesh with the tooth grooves of the force guide chain 90, thereby receiving the force transmitted by the control grab wheel 6; the diameter of the push plate wheel large wheel 83 is 3 times the diameter of the push plate wheel small wheel 84, and the wheel teeth of the push plate wheel large wheel 83 mesh with the top side edge teeth 70 of the movable claw plate, thereby driving the movable claw plates 8 on both sides to move along the fixed plate slide groove 4; the push plate wheel large wheel 83 and the push plate wheel small wheel 84 share a push plate wheel shaft 85, which is made of manganese steel and is cylindrical. It passes through the circular hole in the center of the push plate wheel large wheel 83 and the push plate wheel small wheel 84, and connects the push plate wheel large wheel 83 and the push plate wheel small wheel 84 to form a whole. In this way, when the push plate wheel small wheel 84 rotates due to the force transmitted by the force guide chain 90, the push plate wheel large wheel 83 rotates accordingly, thereby driving the movable claw plates 8 on both sides of the push plate wheel large wheel 83 to move along the fixed plate slide groove 4;

[0030] The adjusting claw wheel 7 is located between the two movable claw plates 8 in the second row and the third row. It is a gear that can push the movable claw plates 8 in the second row and the third row to move relative to each other when it rotates. When the movable claw plates 8 in the second row move along the fixed plate slide groove 4, the adjusting claw wheel 7 is driven to rotate. The adjusting claw wheel 7 has only one wheel disc, which is called the adjusting claw wheel disc 103. The size and structure of the adjusting claw wheel disc 103 are the same as the push plate wheel large wheel 83. The adjusting claw wheel teeth 104 are the teeth on the periphery of the adjusting claw wheel disc 103, which can mesh with the teeth 70 on the top side edge of the movable claw plate, thereby driving the movable claw plates 8 on both sides to move along the fixed plate slide groove 4; the axis in the center of the adjusting claw wheel disc 103 is the adjusting claw wheel shaft 105, which is made of manganese steel and is cylindrical. It passes through the circular hole in the center of the adjusting claw wheel disc 103, and both ends are exposed to the surface of the adjusting claw wheel disc 103, so as to ensure The entire adjusting claw wheel 103 is horizontally located between the movable claw plates 8 on both sides. Due to the meshing of the gear teeth and the support of the adjusting claw wheel shaft 105, the entire adjusting claw wheel 7 can always be located between the movable claw plates 8 on both sides without falling off or tilting; and then when the adjusting claw wheel 7 rotates, the movable claw plates 8 in the second and third rows are driven to move relatively; since the size and structure of the adjusting claw wheel 103 are the same as the push plate wheel large wheel 83, the size and shape of the adjusting claw wheel teeth 104 and the push plate wheel edge teeth 94 are the same, and the size and structure of the movable claw plate top side edge teeth 70 of the six movable claw plates 8 are the same, so that when the control gripping wheel 6 is rotated, the displacements of the movable claw plates 8 in the first, second and third rows when they move along the fixed plate slide groove 4 are the same, thereby ensuring that the relative movement distances of the seven writing claw rods 16 are equal, and the spacing between the drawn lines is equal;

[0031] The control and grab wheel 6 is a rotating wheel for the operator to manually adjust the distance between two adjacent writing claw rods 16. It is set at the central position of the fixed claw body belly 11 corresponding to the front connecting bracket 22. The circular hole in the center of the control and grab wheel 6 is the circular hole through which the control and grab wheel shaft 91 passes. After the control and grab wheel shaft 91 passes through the circular hole, the upper end swells to prevent the grab wheel shaft 91 from falling off from the upper end of the central circular hole of the control and grab wheel 6. The lower end of the control and grab wheel shaft 91 passes through the control and grab wheel inner wheel 86 and is inserted into the shaft groove on the inner surface of the distance adjustment fixed groove 15, so that the control and grab wheel shaft 91 can rotate in the shaft groove; the control and grab wheel 6 is composed of the control and grab wheel inner wheel 86, the control and grab wheel outer wheel 87, the fixed chain wheel body 88, the fixed chain wheel shaft 89, the guide chain 90, the control and grab wheel shaft 91, the control and grab wheel crank handle 92, the control and grab wheel shaft 91, ... shaft 91, the control and grab wheel shaft 91, the control and grab wheel shaft 91, the control and grab wheel shaft 91, the control and grab wheel shaft 91, the control and grab wheel shaft 91, the control and grab wheel shaft 91, the control and grab wheel shaft 91, the control and grab wheel shaft 91, the control and grab wheel shaft 91, the control and grab wheel shaft 91, the control and grab wheel shaft 91, the control and grab wheel shaft 91, the control and grab wheel shaft 91, the The invention relates to a wheel crank handle 93, a push plate wheel rim teeth 94, and a fixed chain wheel 95; the control grip wheel inner wheel 86 is a gear located on the inner side of the upper wall of the belly wall 19 of the fixed claw body, and the periphery of the control grip wheel inner wheel 86 has gear teeth that can mesh with the guide chain 90. When rotating, the guide chain 90 can move left and right along the gear teeth in front and behind the control grip wheel inner wheel 86; the control grip wheel outer wheel 87 is a metal disc with no gear teeth on the edge located on the outer side of the upper wall of the belly wall 19 of the fixed claw body, which is made of copper, stainless steel or aluminum alloy, with a thickness of 1-2 mm and a diameter of 2 / 3 of the diameter of the control grip wheel inner wheel 86; the structure and function of the guide chain 90 are the same as those of commercially available bicycle chains, one section at a time, and each section has a pore for meshing with the gear teeth, so that the gears are moved around the periphery of the gear. During sliding, force is transmitted to drive the rotation of the related wheels; the center of the inner wheel 86 of the control grab wheel and the outer wheel 87 of the control grab wheel are fixedly connected together to form a whole through the control grab wheel shaft 91; the control grab wheel shaft 91 is made of manganese steel and is cylindrical. The lower end of the control grab wheel shaft 91 is fixed to the inner side of the lower wall of the belly wall 19 of the solid claw body through a bearing, and the upper part of the control grab wheel shaft 91 is fixed to the corresponding circular hole on the upper wall of the belly wall 19 of the solid claw body through a bearing. The upper end of the control grab wheel shaft 91 is fixed to the center of the central end of the control grab wheel crank handle 93. By shaking the control grab wheel crank handle 93, the entire control grab wheel 6 can be rotated freely in the two bearings; the control grab wheel crank handle 93 is a handle-shaped protrusion in the center of the outer surface of the control grab wheel outer wheel 87. The length is 1-5 mm shorter than the radius of the outer wheel 87 of the control wheel, the thickness of the control wheel crank handle 93 is 1-5 mm, and the two ends of the control wheel crank handle 93 are respectively called the central end and the outer end; the central end of the control wheel crank handle 93 is thicker, and the width of the widest part of the central end of the control wheel crank handle 93 is greater than the diameter of the control wheel shaft 91, and the center of the central end of the control wheel crank handle 93 is connected to the control wheel shaft 91 as a whole; the outer end of the control wheel crank handle 93 is thinner, and the width of the widest part of the outer end of the control wheel crank handle 93 is half of the width of the widest part of the central end, and a circular hole is set in the center of the outer end of the control wheel crank handle 93, which is divided into upper and lower parts, and the aperture of the upper part is 1-2 mm smaller than the aperture of the upper part, so that the control wheel crank handle convex 92 can be inserted without slipping out;The control and grab wheel crank handle convex 92 is divided into an upper and lower part. The upper part of the control and grab wheel crank handle convex 92 is located outside the center of the outer end of the control and grab wheel crank handle 93, is pear-shaped, and has a length of 3-5 cm, which is convenient for the operator to hold the control and grab wheel crank handle convex 92. The lower part of the control and grab wheel crank handle convex 92 is made of cast iron and is cylindrical. The upper end of the lower part of the control and grab wheel crank handle convex 92 is fixed to the lower end of the upper part of the control and grab wheel crank handle convex 92 by a bolt structure; the lower part of the control and grab wheel crank handle convex 92 is divided into an upper half and a lower half. The diameter of the upper half and the lower half of the cylinder differs by 1-2 mm, and the center of the outer end of the control and grab wheel crank handle 93 The circular hole structure is adapted, but the length of the upper half of the lower part of the control wheel handle convex 92 is greater than the length of the upper half of the circular hole by 1-2 mm, and a magnet block is embedded in the lower end of the lower half of the lower part of the control wheel handle convex 92; a circular cast iron ring is arranged on the outer side of the upper wall of the belly wall 19 of the fixed claw body corresponding to the position below the control wheel handle convex 92, so that the magnet block embedded in the lower end of the control wheel handle convex 92 can be adsorbed on the cast iron ring to prevent the change in the width between the two writing claw rods 16 caused by the possible rotation of the control wheel 6 when drawing lines, so as to ensure the parallelism and beauty of the drawn lines. In this way, when it is necessary to rotate the control grab wheel 6, the outer end of the control grab wheel crank handle 93 is held and pulled outward, and the lower half of the lower part of the control grab wheel crank handle convex 92 is pulled into the lower half of the circular hole, and the entire control grab wheel outer wheel 87 is not blocked and can be rotated outside the upper wall of the belly wall 19 of the fixed claw body, thereby adjusting the width between the two adjacent writing claw rods 16. After adjusting the width between the two adjacent writing claw rods 16, the fixed claw plugs 3 or the top fixed claw plugs 9 on each writing claw rod 16 are inserted into the front edge seam 10 of the fixed claw body to fix the writing claw rod 16, and at the same time, the control grab wheel crank handle convex 92 is pressed down to make the magnet block and the cast iron ring adsorbed together, so that the spacing between the writing claw rods 16 can be guaranteed to be fixed and stable, and no deviation will occur, so that the drawn lines are parallel and beautiful; the fixed chain wheel 95 is located in the first row of fixed plate slide grooves 4 The rotatable disc-shaped gear at the outer end, the fixed chain wheel 95 is divided into two parts, the inner and outer parts, the outer part is the fixed chain wheel body 88, the fixed chain wheel body 88 is thick in the middle, thin at the edge and has a round cake shape with gear teeth, the thickness of the thickest part in the middle of the fixed chain wheel body 88 is 0.5-2 cm, and the thickness of the thinnest part at the edge is 1-5 mm, the gear teeth on the periphery of the fixed chain wheel body 88 are meshed with the gear holes in the middle of the guide chain 90, so that the guide chain 90 can move around the fixed chain wheel 95, the diameter of the fixed chain wheel body 88 is 1 / 4 of the diameter of the inner wheel 86 of the control wheel, a circular hole is set in the center of the fixed chain wheel body 88, and a bearing is lined in the circular hole, and a cylindrical fixed chain wheel shaft 89 is inside the bearing; the fixed chain wheel shaft 89 is made of manganese steel, cylindrical, 1-3 cm long, and both ends are fixed to the inner surface of the belly wall 19 of the fixed claw body. ;

[0032] The fixed claw plug 3 is a plug that is inserted into the front edge slit 10 of the fixed claw body to fix the five writing claws 1 used for drawing lines in the horizontal direction. The five writing claws 1 are the first, third, fourth, fifth and seventh writing claws 1, respectively. Each fixed claw plug 3 is made of plastic or rubber. The fixed claw plug 3 is divided into a front and a rear part. The front part of the fixed claw plug 3 is called a fixed claw plug base 108. The fixed claw plug base 108 is a part for holding the fixed claw plug 3 so as to insert the fixed claw plug plug 47 into the front edge slit 10 of the fixed claw body. The fixed claw plug base 108 is divided into an upper and a lower part. The upper part of the fixed claw plug base 108 is called a fixed claw plug base upper part 52, and the lower part of the fixed claw plug base 108 is called a fixed claw plug base lower part 49. The fixed claw plug base upper part 52 and the fixed claw plug base lower part 49 are against When they are put together, the gap formed between the two is called the fixed claw plug joint 48. At the fixed claw plug joint 48 on one side, a plurality of fixed claw plug fixing stitching pages 53 are arranged in the front-to-back direction to connect the fixed claw plug base upper part 52 and the fixed claw plug base lower part 49 together. Each fixed claw plug fixing stitching page 53 is in the shape of a thin sheet, and the two sides are respectively connected to the lower edge of the fixed claw plug base upper part 52 and the upper edge of the fixed claw plug base lower part 49, and a groove is pressed in the middle so that the plastic or rubber sheet at the middle groove is thinner and the thickness is half of the thickness of the sheets on both sides. However, since plastic or rubber has strong toughness, the fixed claw plug fixing stitching page 53 can firmly connect the fixed claw plug base upper part 52 and the fixed claw plug base lower part 49 together; The fixed claw plug joint 48 is provided with a plurality of fixed claw plug fixing suture pages 53, therefore, the fixed claw plug joint 48 on this side is specifically called the fixed claw plug fixing suture 51; the rear part of the fixed claw plug 3 is called the fixed claw plug plug 47; the fixed claw plug plug 47 is divided into upper and lower parts, the seam between the two parts is a part of the fixed claw plug joint 48, and the fixed claw plug fixing suture pages 53 are provided on the fixed claw plug fixing suture page 53 on the rear of the fixed claw plug joint 48, therefore, the fixed claw plug joint 48 behind the fixed claw plug plug 47 is a part of the fixed claw plug fixing suture 51; a cylindrical fixed claw plug writing claw rod through hole 50 is provided in the center of the fixed claw plug base 108 and the fixed claw plug plug 47 in the front-to-back direction, for the writing claw rod 16 to pass through the fixed claw plug writing claw rod through hole 50, and the fixed claw plug After the plug 47 is inserted into the front edge slot 56 of the front edge slot 10 of the fixed claw body, the upper and lower parts of the fixed claw plug 3 are limited by the upper lip 55 and the lower lip 57 of the front edge slot, and the writing claw rod 16 is fixed at the front edge slot 10 of the fixed claw body, so as to ensure that the spacing between all two adjacent writing claw rods 16 in the line drawing working state is equal and the lower ends of all the writing claw heads 17 for drawing lines are in the same plane; the plug surface concave 54 of the fixed claw plug is a groove on the surface of the plug 47 of the fixed claw plug, and there is one on each of the upper and lower surfaces of the plug 47 of the fixed claw plug, and the depth is 1 / 6 of the width of the base 108 of the fixed claw plug in the upper and lower directions; on the surface of the plug 47 of the fixed claw plug, except for the surfaces of the two plug surface concave 54 of the fixed claw plug, which are inwardly concave curved surfaces, the rest of the surfaces are outwardly protruding curved surfaces;The front edge seam 10 of the fixed claw body is composed of a front edge seam upper lip 55, a front edge seam opening 56, and a front edge seam lower lip 57. The front edge seam upper lip 55 is the portion corresponding to the top of the fixed claw plug plug 47 after the front edge of the belly wall 19 of the fixed claw body is inserted into the fixed claw plug plug 47. The lower surface is convex downward to form an arc surface shape so as to engage with the concave surface 54 of the fixed claw plug plug, and the remaining portion is concave upward to form an arc surface shape so as to engage with the remaining surface of the fixed claw plug plug 47, thereby ensuring that the fixed claw plug plug 47 can be better inserted into the front edge seam 10 of the fixed claw body without slipping out; the front edge seam The lower lip 57 is the part below the fixed claw plug 47 after the front edge of the fixed claw body belly wall 19 is inserted into the fixed claw plug 47. The upper surface is convex upward to form an arc surface shape so as to engage with the surface concave 54 of the fixed claw plug, and the remaining part is concave downward to form an arc surface shape so as to engage with the remaining surface of the fixed claw plug 47, thereby ensuring that the fixed claw plug 47 can be well inserted into the front edge slit 10 of the fixed claw body without slipping out; the front edge slit opening 56 is the space between the front edge slit upper lip 55 and the front edge slit lower lip 57, which is used to insert the fixed claw plug 47. ;

[0033] The top fixed claw plug 9 is a plug that is inserted into the front edge slit 10 of the fixed claw body and then fixes the two writing claws 1 used for drawing lines at an oblique angle of 55° at this location. The two writing claws 1 are the second and sixth writing claws 1, respectively. Each top fixed claw plug 9 is made of plastic or rubber. The top fixed claw plug 9 is divided into two parts, front and rear. The front part of the top fixed claw plug 9 is called the top fixed claw plug base 109. The top fixed claw plug base 109 is a part for holding the top fixed claw plug 9 so as to insert the top fixed claw plug plug 59 into the front edge slit 10 of the fixed claw body. The top fixed claw plug base 109 is divided into three parts. The upper part of the top fixed claw plug base 109 is composed of the front half of the top fixed claw plug top block 64 and the upper part 58 of the top fixed claw plug base. The top fixed claw plug top block 64 is located in the center of the upper part 58 of the top-lifting fixed claw plug base. The upper bottom of the top-lifting fixed claw plug top block 64 is the central part of the upper part 58 of the top-lifting fixed claw plug base, the lower bottom is the top of the top of the writing claw rod through-hole 63 of the top-lifting fixed claw plug, and the two side walls are inclined. Therefore, the top-lifting fixed claw plug top block 64 can fall in the center of the upper part 58 of the top-lifting fixed claw plug base and the upper part of the top-lifting fixed claw plug plug 59. The upper part 58 of the top-lifting fixed claw plug base and the upper part of the top-lifting fixed claw plug plug 59 are a whole, and together constitute the top-lifting fixed claw plug top block 64; the gap between the upper part 58 of the top-lifting fixed claw plug base and the top-lifting fixed claw plug plug 59 is called the top-lifting fixed claw plug top block side seam 65, and the top-lifting fixed claw plug top block side seam 65 runs through the entire top-lifting fixed claw plug 9 from front to back; the two rear sides of the top-lifting fixed claw plug top block 64 A top-lifting claw plug top block connecting ligament 68 is arranged at each of the side seams 65 of the top-lifting claw plug top block at the upper side edge, so as to connect the top-lifting claw plug top block 64 with the upper part of the top-lifting claw plug plug 59; the top-lifting claw plug top block connecting ligament 68 is made of latex and has strong elasticity; the lower part of the top-lifting claw plug base 109 is called the top-lifting claw plug base lower part 60, and the gap formed between the top-lifting claw plug base upper part 58 and the top-lifting claw plug base lower part 60 when they are close together is called the top-lifting claw plug joint seam 61, and at the top-lifting claw plug joint seam 61 on one side, a plurality of top-lifting claw plug joint seam pages 67 are arranged in the front-to-back direction, and the top-lifting claw plug joint seam pages 67 are used to connect the top-lifting claw plug base upper part 58 and the top-lifting claw plug base lower part The top-lifting claw plug suture pages 67 are in the shape of thin sheets, and the two sides are respectively connected to the lower edge of the upper part 58 of the top-lifting claw plug base and the upper edge of the lower part 60 of the top-lifting claw plug base, and a groove is pressed in the middle so that the plastic or rubber thin sheet at the middle groove is thinner, and the thickness at the groove is half of the thickness of the thin sheets on both sides. However, since the plastic or rubber has strong toughness, the top-lifting claw plug suture pages 67 can firmly connect the upper part 58 of the top-lifting claw plug base and the lower part 60 of the top-lifting claw plug base together; since the top-lifting claw plug suture 61 on this side is provided with a plurality of top-lifting claw plug suture pages 67, the top-lifting claw plug suture 61 on this side is specially called the top-lifting claw plug fixed connection seam 66;The ejector spring 62 is located at the center of the bottom surface of the writing claw rod through hole 63 of the ejector plug in the middle of the lower part 60 of the ejector plug base. The lower part 60 of the ejector plug base here has a groove, which is cylindrical, with a depth of 3-5 mm and a diameter of 3-5 mm. The lower part of the ejector spring 62 is set in the groove, and the upper part of the ejector spring 62 is exposed 3-5 mm from the groove; the ejector spring 62 is made of spring steel, and the diameter of the cross section of the spring wire used is 0.3-0.5 mm, and the pitch is 0.5 mm; the rear part of the ejector plug 9 is called the ejector plug plug 59; the ejector plug plug 59 is divided into three parts, and the gap between the upper and lower parts is a part of the ejector plug joint 61, and a plurality of ejector claws are arranged behind the ejector plug joint 61. The plug is sewn together with the suture page 67, so the top-lifting fixed claw plug joint 61 here is a part of the top-lifting fixed claw plug fixed joint 66; when the top-lifting fixed claw plug plug 59 is not inserted into the front edge seam 10 of the fixed claw body, under the action of the top rod spring 62, the writing claw rod 16 here is lifted up, and the writing claw rod 16 then lifts the top-lifting fixed claw plug top block 64, because the rear end of the top-lifting fixed claw plug top block 64 is connected to the upper half of the top-lifting fixed claw plug plug 59 through the top-lifting fixed claw plug top block connecting ligament 68, and the top-lifting fixed claw plug top block connecting ligament 68 itself has a strong elasticity, thereby ensuring that the top-lifting fixed claw plug top block 64 will not be separated from the upper half of the top-lifting fixed claw plug plug 59 after being lifted by the writing claw rod 16, so that the lower end of the writing claw head 17 at the end of the writing claw rod 16 is Leave the same plane where the lower ends of the other five writing claw heads 17 are located; but when the top-lifting fixed claw plug plug 59 is inserted into the front edge slit 10 of the fixed claw body, the three parts of the top-lifting fixed claw plug 9 are squeezed together and then fixed at the front edge slit 10 of the fixed claw body by the upper lip 55 of the front edge slit and the lower lip 57 of the front edge slit, so as to ensure that the spacing between all adjacent two writing claw rods 16 in the line drawing working state is equal and the lower ends of all seven writing claw heads 17 for drawing lines are in the same plane; a cylindrical top-lifting fixed claw plug writing claw rod through hole 63 is provided in the center of the top-lifting fixed claw plug base 109 and the top-lifting fixed claw plug plug 59 in the front-to-back direction, for the writing claw rod 16 to pass through the top-lifting fixed claw plug writing claw rod through hole 63, and when the top-lifting fixed claw plug plug 59 is inserted into the fixed claw body After the front edge seam 56 of the front edge seam 10, the three parts of the top-lifting fixed claw plug 9 are limited by the front edge seam upper lip 55 and the front edge seam lower lip 57 to fix the writing claw rod 16 at the front edge seam 10 of the fixed claw body, so as to ensure that the spacing between all adjacent two writing claw rods 16 in the line drawing working state is equal and the lower ends of all the writing claw heads 17 for drawing lines are in the same plane; the top-lifting fixed claw plug plug surface concave 69 is a groove on the surface of the top-lifting fixed claw plug plug 59, one on each of the upper and lower surfaces of the top-lifting fixed claw plug plug 59, and the depth is 1 / 6 of the width of the top-lifting fixed claw plug base 109 in the upper and lower directions; on the surface of the top-lifting fixed claw plug plug 59, except for the surfaces of the two top-lifting fixed claw plug plug surface concave 69 which are inwardly concave curved surfaces, the rest of the surfaces are outwardly protruding curved surfaces;The front edge seam 10 of the solid claw body where the top solid claw plug 9 is inserted is composed of a front edge seam upper lip 55, a front edge seam opening 56, and a front edge seam lower lip 57. The front edge seam upper lip 55 is the portion corresponding to the top solid claw plug plug 59 after the front edge of the solid claw body belly wall 19 is inserted into the top solid claw plug plug 59. The lower surface protrudes downward to form an arc surface shape so as to engage with the top solid claw plug plug surface concave 69, and the remaining part is concave upward to form an arc surface shape so as to engage with the remaining surface of the top solid claw plug plug 59, thereby ensuring that the top solid claw plug plug 59 can be better inserted into the front edge seam 10 of the solid claw body without slipping out ; The lower lip 57 of the front edge seam is the part corresponding to the bottom of the top-lifting fixed claw plug plug 59 after the front edge of the fixed claw body belly wall 19 is inserted into the top-lifting fixed claw plug plug 59. The upper surface is convex upward to form an arc surface shape so as to engage with the concave surface 69 of the top-lifting fixed claw plug plug, and the remaining part is concave downward to form an arc surface shape so as to engage with the remaining surface of the top-lifting fixed claw plug plug 59, thereby ensuring that the top-lifting fixed claw plug plug 59 can be better inserted into the front edge seam 10 of the fixed claw body without slipping out; the front edge seam opening 56 is the space between the upper lip 55 of the front edge seam and the lower lip 57 of the front edge seam, which is used to insert the top-lifting fixed claw plug plug 59. ;

[0034] The fixed plate slide groove 4 is a fixed groove on which the movable claw plate 8 at the rear of the fixed writing claw rod 16 slides when the control gripping wheel 6 is rotated, thereby adjusting the spacing between two adjacent writing claw heads 17. The bottom of the fixed plate slide groove 4 is fixed to the inner surface of the lower wall of the belly wall 19 of the fixed claw body by a fixed groove bolt 110. There are 6 fixed plate slide grooves 4 in total, which are of the same size and structure and are symmetrically arranged on both sides of the central bracket 23 in the distance adjustment fixed groove 15. The three fixed plate slide grooves 4 on one side are parallel to each other and staggered in front and back. The spacing between the midpoints of the three fixed plate slide grooves 4 is half the length of the fixed plate slide groove 4. The six fixed plate slide grooves 4 form 3 rows, which are distributed from front to back as the first row, the second row and the third row; when setting, the movable claw plate 8 in the fixed plate slide groove 4 The midpoint coincides with the midpoint of the fixed plate chute 4. A push plate wheel 5 is arranged between the first and second rows of the fixed plate chute 4. The push plate wheel shaft 85 of the push plate wheel 5 is located in front of the midpoint of the second row of the fixed plate chute 4. An adjusting claw wheel 7 is arranged between the second and third rows of the fixed plate chute 4. The adjusting claw wheel shaft 105 of the adjusting claw wheel 7 is located in front of the midpoint of the third row of the fixed plate chute 4. The fixed groove bolt 110 is composed of a fixed groove bolt nut 80 and a fixed groove bolt screw 81, which is made of manganese steel. The upper end of the fixed groove bolt screw 81 is enlarged. The upper end of the enlarged fixed groove bolt screw 81 is in a regular hexagonal shape with a thickness of 1-2 mm. The middle part of the groove bolt screw 81 is cylindrical, with a smooth surface and no threads. The diameter of the cross-sectional circle is 2.8-4.8 mm, the middle part of the slot bolt screw 81 is the part inside the slot bolt through-hole 82 when the fixed slot bolt 110 passes through the fixed slot bolt through-hole 82 and the lower wall of the belly wall 19 of the fixed claw body and is tightened, and the peripheral wall is close to the inner wall of the fixed slot bolt through-hole 82; the lower part of the slot bolt screw 81 is cylindrical, and the surface has a thread that can mesh with the thread on the inner surface of the fixed slot bolt nut 80, which is the part that meshes with the fixed slot bolt nut 80 when the fixed slot bolt 110 passes through the fixed slot bolt through-hole 82 and the lower wall of the belly wall 19 of the fixed claw body and is tightened; the inner surface of the fixed slot bolt nut 80 has a thread, and the outer surface is a regular hexagon, the height of the fixed slot bolt nut 80 is 3-5 mm, and the thickness of the wall of the fixed slot bolt nut 80 at the midpoint of the regular hexagon is 2-3 mm; after the fixed slot bolt nut 80 is tightened, the fixed slot The length of the lower end of the bolt screw 81 protruding from the fixed groove bolt nut 80 is 1 mm; there are multiple fixed groove bolt through holes 82, which are evenly spaced and arranged in the center of the bottom wall 79 of the fixed plate slide, and the diameter of the cross-sectional circle of the fixed groove bolt through holes 82 is 3-5 mm; each fixed plate slide 4 is composed of a fixed plate slide slot mouth 72, a fixed plate slide slot wall 73, and a fixed plate slide slot cavity 74. The cross-section of the fixed plate slide 4 is a square as a whole. The wall outside the fixed plate slide 4 is the fixed plate slide slot wall 73, and the cavity surrounded by the fixed plate slide slot wall 73 is the fixed plate slide slot cavity 74. The wall at the bottom and center of the fixed plate slide 4 with the fixed groove bolt through holes 82 is specially called the fixed plate slide slot bottom wall 79, and a fixed plate slide slot mouth 72 with a width of 3-5 mm is arranged in the center of the top wall of the fixed plate slide 4, so that the movable claw plate 8 can slide left and right in the fixed plate slide slot mouth 72 The bottom wall and top wall thickness of the fixed plate slide 4 are the same, both of which are 3-5 mm, and the walls around them are relatively thin, with a thickness of 2-3 mm; the moving claw plate 8 is a structure in which the lower end is fixed by the fixed plate slide 4 and can move left and right in the fixed plate slide cavity 74 along the fixed plate slide mouth 72, and is composed of a moving claw plate top side edge tooth 70, a moving claw plate body 71, a blocking wheel nut 75, a moving claw plate pulley central hole 76, a moving claw plate pulley shaft 77, and a moving claw plate pulley 78. The moving claw plate body 71 is the main body in the center of the moving claw plate 8, which is made of copper, stainless steel or aluminum alloy and is in the shape of a rectangular parallelepiped. The length of the moving claw plate body 71 is 3-10 cm, the width is 1.5-5 cm, and the thickness is 2.8-4.8 mm; the upper part of the front and rear sides of the moving claw plate body 71 is provided with a moving claw plate top side edge tooth 70, and each moving The size and function of the claw plate top side edge teeth 70 are the same as those of the push plate wheel edge teeth 94 and the adjusting claw wheel teeth 104. The only difference is that all the movable claw plate top side edge teeth 70 are arranged on a plane, while the push plate wheel edge teeth 94 and the adjusting claw wheel teeth 104 are arranged on a cylindrical surface; the lower part of the movable claw plate body 71 located in the fixed plate slide groove cavity 74 is provided with a plurality of movable claw plate pulley central holes 76 for the movable claw plate pulley shaft 77 to pass through, the diameter of the cross-sectional circle of the movable claw plate pulley central hole 76 is 1-2 mm, the central axis of all the movable claw plate pulley central holes 76 is located in a plane, and the central axis spacing of two adjacent movable claw plate pulley central holes 76 is equal, both 10 mm; the movable claw plate pulley shaft 77 is made of manganese steel, cylindrical, and the diameter of the cross-sectional circle is 0.98-1.98 mm, the two ends are 0.1-0.2 mm away from the inner surface of the two side walls of the fixed plate slide groove wall 73, and the outer surfaces of the two ends are threaded to mesh with the threads on the inner surface of the blocking wheel nut 75. After the movable claw plate pulley 78 is inserted from the two ends of the movable claw plate pulley shaft 77, the blocking wheel nut 75 is tightened, and the movable claw plate pulley 78 is blocked by the blocking wheel nut 75 to prevent the movable claw plate pulley 78 from slipping off the movable claw plate pulley shaft 77; the movable claw plate pulley 78 is made of manganese steel, and multiple movable claw plate pulleys 78 are arranged between the center of the movable claw plate pulley 78 and the outer surface of the movable claw plate pulley shaft 77, so that the movable claw plate pulley 78, steel balls and the movable claw plate pulley shaft 77 together form a bearing structure, so that the movable claw plate 8 can move more smoothly along the fixed plate slide groove opening 72 in the fixed plate slide groove cavity 74; the diameter of the blocking wheel nut 75 is half of the diameter of the movable claw plate pulley 78, and the thickness is 1 / 5-1 / 4 of the thickness of the movable claw plate pulley 78. .

[0035] It has been verified in practice that by using the 7 writing claws arranged on the front of the fixed claw body, the fixed claw plug and the top fixed claw plug work together, and with the help of the correspondence between the red horizontal line liquid level in the horizontal line liquid box and the scale line, 5 horizontal lines of 1 meter in length are drawn independently and guided, and then 2 oblique lines with an angle of 55° with the horizontal line in the up and down directions are drawn. Finally, the extra lines above the first horizontal line and below the fifth horizontal line are wiped off with a wet cloth. A normal adult can complete the whole process in an average of 2 minutes, while it takes at least 10 minutes to draw the same grid lines without the help of the device. Moreover, the beauty of the lines drawn with the help of the device is much higher than that of the lines drawn without the help of the device. It can be seen that the device is very convenient for drawing grids and lines on the blackboard, which is used in the teaching process of Russian letters.

[0036] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected, and the scope of the present invention to be protected is defined by the attached claims and their equivalents.

Claims

1. An adjustable erasable grid device for teaching and writing Russian letters on a blackboard, comprising a writing claw (1), a fixed claw body (2), a fixed claw plug (3), a fixed plate slide groove (4), a push plate wheel (5), a control gripping wheel (6), an adjusting claw wheel (7), a movable claw plate (8), a top fixed claw plug (9), a horizontal line liquid box (13), and a fixed groove bolt (110), characterized in that: The writing claws (1) are 7 in total, and the spacing between two adjacent writing claws (1) is equal. Each writing claw (1) is composed of a writing claw rod (16) and a writing claw head (17). Each writing claw head (17) includes a chalk (26), a pen insertion port (27), an outer wall of a fixed pen barrel (28), an inner wall of a fixed pen barrel (29), a fixed pen barrel cavity (30), a pen pusher head surrounding cavity (31), a fixed rod bead cavity (32), a push rod bead spring (33), a fixed rod bead (34), a fixed rod bead groove (35), a pen pusher (36), a pen pusher perforation (37), a pen pusher groove portion (38), a pen pusher head plate (39), a pen pusher grooveless portion (40), a pen pusher bottom plate ( 41), a pen pusher bottom plate cushion (42), a pen pusher bottom plate body (43), a writing claw rod base plate (44), a writing claw rod fixed shaft (45), a writing claw rod movable seam (46) and a pen pusher head leaf spring (102), the chalk (26) is a commercially available dust-free chalk made of calcium carbonate (limestone), calcium sulfate (plaster of Paris), polyvinyl alcohol, polypropylene glycol, metal oxide, glycerol and water for writing on a blackboard; the specifications of the chalk (26) are all 75 mm in length, 10.2 mm in diameter at the large end and 8.5 mm in diameter at the small end; when the chalk (26) is installed and used in the adjustable erasable grid device for teaching and writing Russian letters on a blackboard, the large end is moved from the large end to the small end. When the pen insertion opening (27) is inserted into the pen holder cavity (30) and inserted into the lower surface of the lower plate of the pen push rod head plate (39), the length of the chalk (26) is exposed at the lower end of the writing claw head (17) by 5-10 mm; the pen insertion opening (27) is an opening in the center of the lower end surface of the writing claw head (17), which is circular and has a diameter of 9-10 mm, which is slightly smaller than the diameter of the large end of the chalk (26). The surrounding of the pen insertion opening (27) is a latex-like elastic pen holder inner wall (29), and the thickness of the pen holder inner wall (29) is 1 mm. Since the diameter of the pen insertion opening (27) is slightly smaller than the diameter of the large end of the chalk (26), the pen holder inner wall (29) around the pen insertion opening (27) is elastic; The inner wall (29) of the barrel is located on the inner side of the outer wall (28) of the solid pen barrel. The space enclosed by the inner wall (29) of the solid pen barrel is the solid pen barrel cavity (30) for containing the upper part of the chalk (26). The inner wall (29) of the solid pen barrel is latex, elastic, and has a thickness of 1-2.5 mm. The thickness of the inner wall (29) of the solid pen barrel gradually decreases from bottom to top within the surrounding walls of the outer wall (28) of the solid pen barrel. The thickness of the bottom end is 2.5 mm, and the thickness of the top end is 1 mm. The outer wall (28) of the solid pen barrel is the outer wall of the writing claw (17). It is made of copper, stainless steel or aluminum alloy, and is composed of surrounding walls, a bottom wall and a top wall. The thickness of the surrounding walls of the outer wall (28) of the solid pen barrel is 0.The outer wall (28) of the solid pen holder has a thickness of 5-5 mm, a height of 60-65 mm, and an equal thickness in the upper and lower directions. The diameter of the cylindrical inner cavity formed by the solid pen holder is 15 mm. The bottom wall of the solid pen holder outer wall (28) has a thickness of 1-2 mm, a circular hole is arranged in the center, and the diameter of the circular hole is 11-12 mm. The inner surface is lined with a solid pen holder inner wall (29) with a thickness of 1 mm. The circular hole formed in the center of the solid pen holder inner wall (29) is the pen insertion port (27). The top wall of the solid pen holder outer wall (28) has a thickness of 5-20 mm, a circular hole is arranged in the center, which is called a push pen rod through hole (37). The diameter of the push pen rod through hole (37) is 2-5 mm, and the inner surface is smooth. It is a hole for the push pen rod (36) to pass through. The upper end of the entire pen barrel cavity (30) is communicated with the outside world through the pen push rod through hole (37), and the lower end is communicated with the outside world through the pen insertion port (27); the pen push rod head surrounding cavity (31) is the part of the upper end of the pen barrel cavity (30) that holds the pen push rod head plate (39) and the pen push rod head leaf spring (102), and the pen push rod head surrounding cavity (31) belongs to a part of the pen barrel cavity (30); the rod bead cavity (32) is a cylindrical groove for fixing the rod bead (34), and there are two of them, which are symmetrically arranged on a straight line of a circular structure passing through the central axis of the pen push rod (36), and the diameter of each rod bead cavity (32) is 1 mm and the depth is 3-5 mm; the rod bead spring (33) is a spring The pen push rod (36) is made of steel, with a diameter of 0.95 mm and a length of 2.5-4.5 mm; the pen push rod (36) is composed of a pen push rod groove portion (38), a pen push rod head plate (39), a pen push rod non-groove portion (40), and a pen push rod bottom plate (41). The pen push rod (36) is a structural component for pushing the chalk (26) out of the pen holder cavity (30) from the pen insertion port (27); the pen push rod (36) is composed of a pen push rod bottom plate (41), a pen push rod non-groove portion (40), a pen push rod groove portion (38), and a pen push rod head plate (39) from top to bottom; the pen push rod bottom plate (41) is a bulged portion at the upper end of the pen push rod (36) and is cylindrical. The diameter of the pen push rod bottom plate (41) is 10-1 5 mm, 5-10 mm in height, and composed of a push pen rod bottom plate cushion (42) and a push pen rod bottom plate body (43); the push pen rod bottom plate cushion (42) is the upper part of the push pen rod bottom plate (41), is made of silicone, and has a thickness of 3-6 mm; the push pen rod bottom plate body (43) is made of copper, stainless steel or aluminum alloy, and has a thickness of 2-4 mm, and the upper surface is adhered to the push pen rod bottom plate cushion (42) by an adhesive, and the center of the lower surface is welded to the upper end of the push pen rod non-groove part (40); the push pen rod non-groove part (40) is made of copper, stainless steel or aluminum alloy, has a smooth surface, has no rod fixing bead groove (35), and has a circular cross section with a diameter of 1.95-4.95 mm, length of 10-20 mm; the push pen rod groove portion (38) is a portion of the push pen rod without groove portion (40) below the surface of the symmetrically arranged two rod bead grooves (35), the upper end of the push pen rod groove portion (38) and the push pen rod without groove portion (40) are connected together to form a whole, and the lower end is welded to the center of the upper surface of the upper plate of the push pen rod head plate (39); the rod bead (34) is made of manganese steel, spherical, and has a diameter of 0.95 mm; the rod bead groove (35) is hemispherical, with a diameter of 1 mm, and is symmetrically arranged on the outer surface of the push pen rod groove portion (38). After being installed on the writing claw head (17), the central axis of the two symmetrically arranged rod bead grooves (35) and the central axis of the rod bead cavity (32) are in the same plane, and on the surface of the push pen rod groove portion (38), the upper and lower adjacent rods are located on the same plane. The bead grooves (35) are 5 mm apart, that is, the lower edge of the upper fixed rod bead groove (35) is 5 mm away from the upper edge of the lower fixed rod bead groove (35); the push pen rod head plate (39) is a structure at the lower end of the push pen rod (36), which is composed of an upper plate, a push pen rod head leaf spring (102) and a lower plate. The upper plate of the push pen rod head plate (39) is made of manganese steel and is in a disc shape. The diameter of the circular push pen rod head plate (39) upper plate is 8.5 mm and the thickness is 1 mm; the push pen rod head leaf spring (102) is made of spring steel, with a diameter of 6-7 mm and a height of 3-5 mm. The upper end is welded to the lower surface of the upper plate of the push pen rod head plate (39), and the lower end is welded to the upper surface of the lower plate of the push pen rod head plate (39); the lower plate of the push pen rod head plate (39) is made of manganese steel and is in a disc shape. The diameter of the circular push pen rod head plate (39) lower plate is 8.5 mm, 1 mm thick; the fixed writing claw rod base plate (44) is made of copper, stainless steel or aluminum alloy, a total of 2 pieces, arranged in parallel, the two fixed writing claw rod base plates (44) are 5-10 mm apart, each fixed writing claw rod base plate (44) has a semicircular longitudinal section, a diameter of 15-30 mm, and a thickness of 1-2 mm; the diameter edge of the fixed writing claw rod base plate (44) is welded to the outer surface of the surrounding wall of the fixed pen holder outer wall (28) in the up and down direction, and a circular hole with a diameter of 3-5 mm is provided in the center of the fixed writing claw rod base plate (44); the writing claw rod fixed shaft (45) is made of manganese steel, cylindrical, and has a diameter of 3-5 mm. After being inserted into the circular hole in the center of the fixed writing claw rod base plate (44), the middle The outer surface of the central part is welded and fixed to the outer end of the writing claw rod (16); the writing claw rod (16) is made of manganese steel, cylindrical, with a diameter of 4-8 mm, and the lower surface 5-10 mm away from the inner end is welded to the top surface of the movable claw plate (8), so that the central axis of the writing claw rod (16) is perpendicular to the plane where the inner and outer surfaces of the movable claw plate (8) are located; the writing claw rod movable seam (46) is a gap between the outer end of the writing claw rod (16) and the outer surface of the surrounding wall of the fixed pen holder outer wall (28); the horizontal line liquid box (13) is hemispherical, with a diameter of 5-10 cm, and is arranged at the center of the outer surface of the upper wall of the fixed claw body belly wall (19); the horizontal line liquid box wall (101) is the outer wall of the horizontal line liquid box (13), which is a transparent plastic or The horizontal line liquid box is made of glass and has a thickness of 1-2 mm. The cavity surrounded by the horizontal line liquid box wall (101) is the horizontal line liquid box cavity (100). The horizontal line liquid box cavity (100) is filled with red horizontal line liquid (96) and then sealed without any opening. The red horizontal line liquid (96) is prepared from three pigments and water. The ratio of the three pigments is: bright red: light yellow: fluorescent orange-red = 10:3:

2. The bright red pigment is carmine, the light yellow pigment is lead chrome yellow, iron yellow, strontium calcium yellow, transparent yellow or benzidine yellow, and the fluorescent orange-red pigment is AF555 succinimide ester or trisulfonic acid-Cy3.5-carboxylic acid. The amount of red horizontal line liquid (96) added is one-tenth of the volume of the horizontal line liquid box cavity (100). After the red horizontal line liquid (96) is added, the outer surface of the horizontal line liquid box wall (101) is marked with a level gauge to make a horizontal mark (106) and a 55° oblique mark (107); the horizontal line liquid box solid ring (97) is made of copper, stainless steel or aluminum alloy, and is annular. The annular ring body is the horizontal line liquid box solid ring body (99). The thickness of the horizontal line liquid box solid ring body (99) is 0.5-1 mm. The outer half of the cross section of the horizontal line liquid box solid ring body (99) is a straight line, and the inner half is an arc shape. The inner half is just stuck on the outer surface of the lower edge of the horizontal line liquid box wall (101). 3-4 solid ring screws (98) are set at equal angles in the center of the outer side of the horizontal line liquid box solid ring body (99). .

2. The adjustable and erasable grid device for teaching and writing Russian letters on a blackboard according to claim 1, characterized in that: The fixed claw body (2) is in the shape of a brush with a handle; the fixed claw body (2) is divided into two parts, the front half of the fixed claw body (2) is the fixed claw body belly (11); the back half of the fixed claw body (2) is the fixed claw body handle (12); the outer walls of the fixed claw body belly (11) and the fixed claw body handle (12) are connected to each other to form a whole, the cavities in the fixed claw body belly (11) and the fixed claw body handle (12) are connected together, and the outer wall of the fixed claw body belly (11) is the fixed claw body belly wall (19); the fixed claw body belly wall (19) is made of stainless steel or plastic and has a thickness of 1-2 mm; the cavity surrounded by the fixed claw body belly wall (19) is the fixed claw body belly cavity (18), and a horizontal line liquid box (13) is fixed at the center of the outer surface of the upper wall of the fixed claw body belly wall (19); The outer wall of the body handle (12) is a fixed claw body handle wall (21), which is made of stainless steel or plastic and has a thickness of 1-2 mm; the cavity surrounded by the fixed claw body handle wall (21) is a fixed claw body handle cavity (20); the fixed claw body belly cavity (18) and the fixed claw body handle cavity (20) are provided with a part of a fixed claw body frame (14), a distance adjustment fixed groove (15) and a writing claw rod (16); six fixed plate slide grooves (4) are fixed above the distance adjustment fixed groove (15), and a movable claw plate (8) is fixed in each fixed plate slide groove (4); the fixed claw body (2) is composed of a fixed claw body front edge seam (10), a fixed claw body belly (11), a fixed claw body handle (12), a fixed claw body frame (14), a distance adjustment fixed groove (15), a writing claw rod (16), a writing The invention comprises a claw head (17), a fixed claw body belly cavity (18), a fixed claw body belly wall (19), a fixed claw body handle cavity (20), a fixed claw body handle wall (21), a connecting bracket (22), a central bracket (23), an intermediate bracket (24), and an oblique bracket (25); the front edge seam (10) of the fixed claw body is a crack at the front edge of the belly of the fixed claw body (11), which is formed by the front edges of the upper and lower parts of the belly wall (19) of the fixed claw body, and the inner surface of the front edge seam (10) of the fixed claw body has a semicircular groove; the front edge seam (10) of the fixed claw body is connected to the left and right, and the seven writing claw rods (16) that are not inserted into the fixed claw plug (3) and the top fixed claw plug (9) can move left and right in the front edge seam (10) of the fixed claw body; the inner frame (14) of the fixed claw body is a bracket for supporting and fixing the inside of the fixed claw body (2), and is made of manganese steel. The solid claw body (2) has a circular cross section, and the diameter of the circular solid claw body frame (14) is 3-5 mm; according to different positions and functions, each solid claw body frame (14) is named as a connecting frame (22), a central frame (23), an intermediate frame (24) and an oblique frame (25); the central frame (23) is the most central frame of the entire solid claw body (2), and runs through the center of the solid claw body belly (11) and the solid claw body handle (12); the front end of the central frame (23) is welded to the top of the two front oblique frames (25), and at the same time, the rear end of the most central writing claw rod (16) is welded to the front upper part of the central frame (23); the rear end of the central frame (23) is fixed to the center of the last connecting frame (22) of the solid claw body handle (12);There are four oblique brackets (25) in total, which are obliquely distributed in the belly cavity (18) of the fixed claw body and arranged along the edge of the belly cavity (18) of the fixed claw body. There are two oblique brackets (25) in the front part of the belly cavity (18) of the fixed claw body and two in the rear part. The four oblique brackets (25) constitute the supporting frame of the belly cavity (18) of the fixed claw body. The side brackets (24) are located on both sides of the central bracket (23) and are parallel to the central bracket (23). There are three pairs of side brackets (24) in total, which are respectively located at the central position between the central bracket (23) and the side brackets (24) at the edge of the belly cavity (18) of the fixed claw body, at a distance of 1 cm from the central bracket (23), and at the edge of the belly cavity (18) of the fixed claw body. The side bracket (24) at the center between the side brackets (24) at the edges of the claw body (18) is completely located in the belly of the fixed claw body (11), the lower surface of the front end of the side bracket (24) is welded to the frontmost connecting bracket (22), and the rear end of the side bracket (24) is welded to the center of the rear oblique bracket (25) in the belly cavity (18) of the fixed claw body; the side bracket (24) at a distance of 1 cm from the central bracket (23) is adjacent to the central bracket (23), the lower surface of the front end of the side bracket (24) is welded to the frontmost connecting bracket (22), the lower surface of the central part of the side bracket (24) is welded to the rear oblique bracket (25), and the side bracket (24) is welded to the rear oblique bracket (25). The rear end of the bracket (24) is welded to one end of a short connecting bracket (22) at the back; the front end of the side bracket (24) at the edge of the fixed claw body belly cavity (18) is free, and the side surface 1 cm away from the free end is welded to the outer end of the front oblique bracket (25), and the rear end of the side bracket (24) is welded to the outer ends of the front connecting bracket (22) and the rear oblique bracket (25); there are two connecting brackets (22), the front connecting bracket (22) is located at the rear edge of the distance adjustment fixed groove (15), and both ends extend to the rear end of the side bracket (24) at the edge of the fixed claw body belly cavity (18), and the rear connecting bracket (22) is located at the rear of the fixed claw body handle cavity (20), and the two ends are welded The center of the connecting bracket (22) is welded to the lower surface of the rear part of the central bracket (23) on the inner side of the side bracket (24) at a distance of 1 cm from the central bracket (23); the distance adjustment fixing groove (15) is made of copper, stainless steel or aluminum alloy, and is in a rectangular parallelepiped shape. The side walls at both ends in the length direction are welded and fixed to the inner side of the side bracket (24) at the edge position of the belly cavity (18) of the fixed claw body, and the rear side wall is welded and fixed to the front of the front connecting bracket (22). The front side wall is welded to the front oblique bracket (25) at the junction, and the side bracket (24) and the oblique bracket (25) at the junction of the distance adjustment fixing groove (15) and the distance adjustment fixing groove (15) are tightly connected and fixed together;The thickness of the plate used to make the pitch-adjusting fixed groove (15) is 1-2 mm. The pitch-adjusting fixed groove (15) has only four walls and a bottom wall, but no top wall. Six fixed plate slide grooves (4) and six movable claw plates (8) are fixed in the pitch-adjusting fixed groove (15). The six fixed plate slide grooves (4) and the six movable claw plates (8) are arranged in three rows in the front and back of the pitch-adjusting fixed groove (15). Each row has two symmetrically arranged fixed plate slide grooves (4) and movable claw plates (8), and the spacing between two adjacent rows is equal; the inner ends of the two fixed plate slide grooves (4) in the first row are welded to the two side surfaces of the central bracket (23). The inner ends of the two fixed plate slide grooves (4) are close together, and a control wheel (6) is welded above the welding point of the three. The control wheel (6) is connected to the push plate wheels (5) on the left and right sides and the fixed chain wheels (95) at the outer ends of the two fixed plate slide grooves (4) through a force guide chain (90). The push plate wheel (5) is preceded by the first row of movable claw plates (8), and the second row of movable claw plates (8) is followed by the second row of movable claw plates (8). An adjusting claw wheel (7) is arranged between the second row of movable claw plates (8) and the third row of movable claw plates (8). The push plate wheel (5) and the adjusting claw wheel (7) have the same size and structure.

3. The adjustable and erasable grid device for teaching and writing Russian letters on a blackboard according to claim 1, characterized in that: The push plate wheel (5) is located between the two movable claw plates (8) in the first row and the second row. The push plate wheel (5) is connected to the control gripping wheel (6) by a force guide chain (90). The push plate wheel (5) is composed of a large push plate wheel wheel (83), a small push plate wheel wheel (84), and a push plate wheel shaft (85). The large push plate wheel wheel (83) and the small push plate wheel wheel (84) are both provided with push plate wheel rim teeth (94) at their peripheries. The push plate wheel rim teeth (94) have the same structure and function as the teeth at the periphery of the circular wheel at the pedal of the straight-line vehicle. The outer edges of all the push plate wheel rim teeth (94) form a streamlined curve. The small push plate wheel wheel (84) ) is meshed with the tooth grooves of the force guide chain (90); the diameter of the large wheel (83) of the push plate wheel is three times the diameter of the small wheel (84) of the push plate wheel, and the teeth of the large wheel (83) of the push plate wheel are meshed with the side edge teeth (70) of the top of the movable claw plate; the large wheel (83) of the push plate wheel and the small wheel (84) of the push plate wheel share a push plate wheel shaft (85), which is made of manganese steel and is cylindrical. It passes through the circular holes in the center of the large wheel (83) of the push plate wheel and the small wheel (84), and connects the large wheel (83) of the push plate wheel and the small wheel (84) of the push plate wheel to form a whole.

4. The adjustable and erasable grid device for teaching and writing Russian letters on a blackboard according to claim 1, characterized in that: The adjusting claw wheel (7) is located between the two movable claw plates (8) in the second row and the third row. The adjusting claw wheel (7) has only one wheel disc, which is called the adjusting claw wheel disc (103). The size and structure of the adjusting claw wheel disc (103) are the same as those of the push plate wheel (83). The adjusting claw wheel teeth (104) are the teeth on the periphery of the adjusting claw wheel disc (103). The axis in the center of the adjusting claw wheel disc (103) is the adjusting claw wheel shaft (105). The adjusting claw wheel shaft (105) is made of manganese steel and is cylindrical. The surfaces of the adjusting claw wheel disc (103) are exposed at both ends of the circular hole in the center of the adjusting claw wheel disc (103); when the adjusting claw wheel (7) rotates, the movable claw plates (8) in the second and third rows are driven to move relatively; since the size and structure of the adjusting claw wheel disc (103) are the same as those of the push plate wheel (83), the size and shape of the adjusting claw wheel teeth (104) and the push plate wheel edge teeth (94) are the same, and the size and structure of the movable claw plate top side edge teeth (70) of the six movable claw plates (8) are the same.

5. The adjustable and erasable grid device for teaching and writing Russian letters on a blackboard according to claim 1, characterized in that: The control wheel (6) is a rotating wheel for the operator to manually adjust the distance between two adjacent writing claw rods (16). The control wheel (6) is arranged at the central position of the fixed claw body (11) corresponding to the front connecting bracket (22). The circular hole in the center of the control wheel (6) is a circular hole through which the control wheel shaft (91) passes. After passing through the circular hole, the upper end of the control wheel shaft (91) expands. The lower end of the control wheel shaft (91) passes through the control wheel inner wheel (86) and is inserted into the shaft groove on the inner surface of the distance adjustment fixed groove (15). The control wheel (6) is composed of the control wheel inner wheel (86), the control wheel outer wheel (87), the fixed chain wheel body (88), the fixed chain wheel shaft (89), the guide chain (90), the control wheel shaft (91), the control wheel The invention is composed of a gripping wheel crank convex (92), a gripping wheel control crank (93), a push plate wheel rim teeth (94), and a fixed chain wheel (95); the gripping wheel inner wheel (86) is a gear located on the inner side of the upper wall of the fixed claw body belly wall (19), and the periphery of the gripping wheel inner wheel (86) has gear teeth that can mesh with the force guide chain (90); the gripping wheel outer wheel (87) is a metal disc with no gear teeth on the edge located on the outer side of the upper wall of the fixed claw body belly wall (19), and is made of copper, stainless steel or aluminum alloy, with a thickness of 1-2 mm and a diameter of 2 / 3 of the diameter of the gripping wheel inner wheel (86); the force guide chain (90) has the same structure and function as a commercially available bicycle chain, and is segmented, and each segment has pores; the gripping wheel outer wheel (87) is a metal disc with no gear teeth on the edge located on the outer side of the upper wall of the fixed claw body belly wall (19), and is made of copper, stainless steel or aluminum alloy, with a thickness of 1-2 mm and a diameter of 2 / 3 of the diameter of the gripping wheel inner wheel (86); the force guide chain (90) has the same structure and function as a commercially available bicycle chain, and is segmented, and each segment has pores; The center of the grab wheel inner wheel (86) and the control grab wheel outer wheel (87) are fixedly connected together to form a whole through the control grab wheel shaft (91); the control grab wheel shaft (91) is made of manganese steel and is cylindrical; the lower end of the control grab wheel shaft (91) is fixed to the inner side of the lower wall of the fixed claw body belly wall (19) through a bearing; the upper part of the control grab wheel shaft (91) is fixed to the corresponding circular hole of the upper wall of the fixed claw body belly wall (19) through a bearing; the upper end of the control grab wheel shaft (91) is fixed to the center of the central end of the control grab wheel crank handle (93); the control grab wheel crank handle (93) is a handle-shaped protrusion in the center of the outer surface of the control grab wheel outer wheel (87); the length of the control grab wheel crank handle (93) is shorter than the radius of the control grab wheel outer wheel (87) 1-5 mm, the thickness of the control wheel handle (93) is 1-5 mm, and the two ends of the control wheel handle (93) are respectively called the central end and the outer end; the central end of the control wheel handle (93) is thicker, and the width of the widest part of the central end of the control wheel handle (93) is greater than the diameter of the control wheel shaft (91), and the center of the central end of the control wheel handle (93) is connected to the control wheel shaft (91) to form a whole; the outer end of the control wheel handle (93) is thinner, and the width of the widest part of the outer end of the control wheel handle (93) is half of the width of the widest part of the central end, and a circular hole is arranged in the center of the outer end of the control wheel handle (93), and the circular hole is divided into upper and lower parts, and the hole diameter of the upper part is 1-2 mm smaller than the hole diameter of the upper part;The control and grab wheel handle convex (92) is divided into two parts, the upper part of the control and grab wheel handle convex (92) is located outside the center of the outer end of the control and grab wheel handle (93), is pear-shaped, and has a length of 3-5 cm, which is convenient for the operator to hold the control and grab wheel handle convex (92). The lower part of the control and grab wheel handle convex (92) is made of cast iron and is cylindrical. The upper end of the lower part of the control and grab wheel handle convex (92) is fixed to the lower end of the upper part of the control and grab wheel handle convex (92) by a bolt structure; The lower part of the wheel crank handle convex (92) is divided into an upper half and a lower half. The diameters of the upper half and the lower half of the cylinder differ by 1-2 mm. The length of the upper half of the lower part of the control wheel crank handle convex (92) is 1-2 mm longer than the length of the upper half of the circular hole. A magnet block is embedded at the lower end of the lower half of the lower part of the control wheel crank handle convex (92). A magnet block is arranged on the outer side of the upper wall of the belly wall (19) of the fixed claw body at a position below the control wheel crank handle convex (92). The solid chain wheel (95) is a rotatable disc-shaped gear located at the outer end of the first row of solid plate slide grooves (4). The solid chain wheel (95) is divided into an inner part and an outer part. The outer part is a solid chain wheel body (88). The solid chain wheel body (88) is thick in the middle, thin at the edge and has a round pancake shape with gear teeth. The thickness of the thickest part in the middle of the solid chain wheel body (88) is 0.5-2 cm, and the thickness of the thinnest part at the edge is 1-5 mm. The solid chain wheel body (88) is thick in the middle and thin at the edge. 8) The gear teeth on the periphery mesh with the gear teeth holes in the middle of the guide chain (90), the diameter of the fixed chain wheel body (88) is 1 / 4 of the diameter of the inner wheel (86) of the control wheel, and a circular hole is arranged in the center of the fixed chain wheel body (88), and a bearing is arranged in the circular hole, and a cylindrical fixed chain wheel shaft (89) is arranged in the bearing; the fixed chain wheel shaft (89) is made of manganese steel, is cylindrical, has a length of 1-3 cm, and both ends are fixed to the inner surface of the belly wall (19) of the fixed claw body. ; 6. The adjustable and erasable grid device for teaching and writing Russian letters on a blackboard according to claim 1, characterized in that: The fixed claw plug (3) is a plug which is inserted into the front edge slit (10) of the fixed claw body to fix five writing claws (1) used for drawing lines in the horizontal direction thereon. The five writing claws (1) are respectively the first, third, fourth, fifth and seventh writing claws (1). Each fixed claw plug (3) is made of plastic or rubber. The fixed claw plug (3) is divided into two parts, front and rear. The front part of the fixed claw plug (3) is called the fixed claw plug base (108). The fixed claw plug base (108) is further divided into two parts, upper and lower. The upper part of the fixed claw plug base (108) is called the fixed claw plug. The upper part of the base (52) and the lower part of the fixed claw plug base (108) are called the lower part of the fixed claw plug base (49). When the upper part of the fixed claw plug base (52) and the lower part of the fixed claw plug base (49) are placed together, a gap formed between the two is called the fixed claw plug joint (48). At the fixed claw plug joint (48) on one side, a plurality of fixed claw plug joint suture pages (53) are arranged in the front-to-back direction. Each fixed claw plug joint suture page (53) is in the form of a thin sheet, and its two sides are respectively connected to the lower edge of the upper part of the fixed claw plug base (52) and the lower part of the fixed claw plug base (49). ) is formed on the upper edge of the fixed claw plug, and a groove is pressed out in the middle; since the fixed claw plug joint (48) on this side is provided with a plurality of fixed claw plug fixed connection suture pages (53), the fixed claw plug joint (48) on this side is specifically called a fixed claw plug fixed connection seam (51); the rear part of the fixed claw plug (3) is called a fixed claw plug plug (47); the fixed claw plug plug (47) is divided into upper and lower parts, and the seam between the two parts is a part of the fixed claw plug joint (48); the fixed claw plug fixed connection suture pages (53) are provided on the fixed claw plug fixed connection seam (51) behind the fixed claw plug joint (48) ; A cylindrical fixed claw plug writing claw rod through hole (50) is provided in the center of the fixed claw plug base (108) and the fixed claw plug plug (47) in the front-back direction; the fixed claw plug plug surface concave (54) is a groove on the surface of the fixed claw plug plug (47), one on each of the upper and lower surfaces of the fixed claw plug plug (47), and the depth is 1 / 6 of the width of the fixed claw plug base (108) in the upper and lower directions; on the surface of the fixed claw plug plug (47), except for the surfaces of the two fixed claw plug plug surface concave (54) which are inwardly concave curved surfaces, the remaining surfaces are all outwardly protruding curved surfaces; The front edge seam (10) of the fixed claw body is composed of a front edge seam upper lip (55), a front edge seam opening (56), and a front edge seam lower lip (57). The front edge seam upper lip (55) is a portion corresponding to the upper side of the fixed claw plug plug (47) after the front edge of the fixed claw body belly wall (19) is inserted into the fixed claw plug plug (47), and the lower surface is convex downward to form an arc shape, while the remaining part is concave upward to form an arc shape; the front edge seam lower lip (57) is a portion corresponding to the lower side of the fixed claw plug plug (47) after the front edge of the fixed claw body belly wall (19) is inserted into the fixed claw plug plug (47), and the upper surface is convex upward to form an arc shape, while the remaining part is concave downward to form an arc shape; the front edge seam opening (56) is a space between the front edge seam upper lip (55) and the front edge seam lower lip (57).

7. The adjustable and erasable grid device for teaching and writing Russian letters on a blackboard according to claim 1, characterized in that: The top-lifting fixed claw plug (9) is a plug which is inserted into the front edge seam (10) of the fixed claw body to fix two writing claws (1) used for drawing lines at an angle of 55 degrees thereto. The two writing claws (1) are the second and sixth writing claws (1), respectively. Each top-lifting fixed claw plug (9) is made of plastic or rubber. The top-lifting fixed claw plug (9) is divided into two parts, front and rear. The front part of the top-lifting fixed claw plug (9) is called the top-lifting fixed claw plug base (109). The top-lifting fixed claw plug base (109) is divided into three parts. The upper part of the top-lifting fixed claw plug base (109) is composed of the front half of the top-lifting fixed claw plug top block (64) and the top-lifting fixed claw plug base upper part (58). The top-lifting fixed claw plug top block (64) is located at the center of the top-lifting fixed claw plug base upper part (58). The upper bottom of (64) is the central part of the upper part (58) of the top-lifting fixed claw plug base, the lower bottom is the top of the writing claw rod through hole (63) of the top-lifting fixed claw plug, and the two side walls are inclined. The upper part (58) of the top-lifting fixed claw plug base and the upper part of the top-lifting fixed claw plug plug (59) are a whole, and together constitute the top-lifting fixed claw plug top block (64); the gap between the upper part (58) of the top-lifting fixed claw plug base and the top-lifting fixed claw plug plug (59) is called the top-lifting fixed claw plug top block side seam (65), and the top-lifting fixed claw plug top block side seam (65) runs through the entire top-lifting fixed claw plug (9) from front to back; a top-lifting fixed claw plug top block connecting ligament (68) is respectively arranged at the top-lifting fixed claw plug top block side seam (65) on both sides of the upper side edge of the rear part of the top-lifting fixed claw plug top block (64), and the top-lifting fixed claw plug top block connecting ligament (68) is latex. The material has strong elasticity; the lower part of the top-lifting claw plug base (109) is called the top-lifting claw plug base lower part (60); when the top-lifting claw plug base upper part (58) and the top-lifting claw plug base lower part (60) are close together, the gap formed between the two is called the top-lifting claw plug joint (61); at the top-lifting claw plug joint (61) on one side, a plurality of top-lifting claw plug joint pages (67) are arranged in the front-to-back direction; each top-lifting claw plug joint page (67) is in the form of a thin sheet, and the two sides are respectively connected to the lower edge of the top-lifting claw plug base upper part (58) and the upper edge of the top-lifting claw plug base lower part (60); a groove is pressed out in the middle; the thickness of the groove is half of the thickness of the thin sheets on both sides; however, since the plastic or rubber has strong toughness, the top-lifting claw plug The seam pages (67) can firmly connect the upper part (58) of the top-lifting fixed claw plug base and the lower part (60) of the top-lifting fixed claw plug base together; since the top-lifting fixed claw plug seam (61) on this side is provided with a plurality of top-lifting fixed claw plug seam pages (67), the top-lifting fixed claw plug seam (61) on this side is specifically called the top-lifting fixed claw plug fixed seam (66); the top rod spring (62) is located at the center of the bottom surface of the top-lifting fixed claw plug writing claw rod through hole (63) in the middle of the lower part (60) of the top-lifting fixed claw plug base, and the lower part (60) of the top-lifting fixed claw plug base has a groove, which is cylindrical, has a depth of 3-5 mm and a diameter of 3-5 mm, and the lower part of the top rod spring (62) is arranged in the groove, and the upper part of the top rod spring (62) is exposed 3-5 mm from the groove;The ejector spring (62) is made of spring steel, the cross-sectional diameter of the spring wire used is 0.3-0.5 mm, and the pitch is 0.5 mm; the rear part of the top-lifting fixed claw plug (9) is called the top-lifting fixed claw plug plug (59); the top-lifting fixed claw plug plug (59) is divided into three parts, the seam between the upper and lower parts is a part of the top-lifting fixed claw plug joint (61), and a plurality of top-lifting fixed claw plug joint pages (67) are arranged behind the top-lifting fixed claw plug joint (61); A cylindrical top-lifting fixed claw plug writing claw rod through hole (63) is arranged in the center of the fixed claw plug base (109) and the top-lifting fixed claw plug plug (59) in the front-back direction; the top-lifting fixed claw plug plug surface concave (69) is a groove on the surface of the top-lifting fixed claw plug plug (59), one on each of the upper and lower surfaces of the top-lifting fixed claw plug plug (59), and the depth is 1 / 6 of the width of the top-lifting fixed claw plug base (109) in the upper and lower directions; on the surface of the top-lifting fixed claw plug plug (59), except The surfaces of the two top-lifting fixed claw plug plug concave surfaces (69) are inwardly concave curved surfaces, and the remaining surfaces are all outwardly protruding curved surfaces; the front edge seam (10) of the fixed claw body at the insertion position of the top-lifting fixed claw plug (9) is composed of a front edge seam upper lip (55), a front edge seam opening (56), and a front edge seam lower lip (57); the front edge seam upper lip (55) is a portion corresponding to the top of the top-lifting fixed claw plug plug (59) after the front edge of the fixed claw body belly wall (19) is inserted into the top-lifting fixed claw plug plug (59). The lower surface of the front edge seam (57) is a portion corresponding to the lower part of the top-lifting fixed claw plug plug (59) after the front edge of the fixed claw body belly wall (19) is inserted into the top-lifting fixed claw plug plug (59), and the upper surface is upwardly protruding to form an arc shape, while the remaining part is downwardly concave to form an arc shape; the front edge seam opening (56) is the space between the front edge seam upper lip (55) and the front edge seam lower lip (57). ; 8. The adjustable and erasable grid device for teaching and writing Russian letters on a blackboard according to claim 1, characterized in that: The bottom of the fixed plate slide groove (4) is fixed to the inner surface of the lower wall of the belly wall (19) of the fixed claw body by a fixing groove bolt (110). There are 6 fixed plate slide grooves (4) in total, which are of the same size and structure and are symmetrically arranged on both sides of the central bracket (23) of the adjustable fixed groove (15). The three fixed plate slide grooves (4) on one side are parallel to each other and staggered in front and back. The spacing between the midpoints of the three fixed plate slide grooves (4) is half the length of the fixed plate slide groove (4). The six fixed plate slide grooves (4) form 3 rows, which are distributed from front to back as the first row, the second row and the third row. When arranged, the midpoint of the movable claw plate (8) in the fixed plate slide groove (4) coincides with the midpoint of the fixed plate slide groove (4). The middle of the first row and the second row of fixed plate slide grooves (4) is A push plate wheel (5) is provided, and a push plate wheel shaft (85) of the push plate wheel (5) is located in front of the midpoint of the second row of fixed plate slide grooves (4); an adjusting claw wheel (7) is provided between the second and third rows of fixed plate slide grooves (4), and an adjusting claw wheel shaft (105) of the adjusting claw wheel (7) is located in front of the midpoint of the third row of fixed plate slide grooves (4); a fixed groove bolt (110) is composed of a fixed groove bolt nut (80) and a fixed groove bolt screw rod (81), which is made of manganese steel, and the upper end of the fixed groove bolt screw rod (81) is enlarged, and the upper end periphery of the enlarged fixed groove bolt screw rod (81) is in the shape of a regular hexagon and has a thickness of 1-2 mm; the middle part of the groove bolt screw rod (81) is cylindrical, has a smooth surface, has no threads, and has a cross-sectional diameter of 2.8-4.8 mm, the middle part of the slot bolt screw (81) is the part inside the slot bolt through hole (82) when the slot bolt (110) passes through the slot bolt through hole (82) and the lower wall of the fixed claw body belly wall (19) and is tightened, and the peripheral wall is close to the inner wall of the slot bolt through hole (82); the lower part of the slot bolt screw (81) is cylindrical, and the surface has a thread that can mesh with the thread on the inner surface of the slot bolt nut (80), which is the part that meshes with the slot bolt nut (80) when the slot bolt (110) passes through the slot bolt through hole (82) and the lower wall of the fixed claw body belly wall (19) and is tightened; the inner surface of the slot bolt nut (80) The fixing plate chute (4) is provided with a thread, and the outer surface is a regular hexagon. The height of the fixing groove bolt nut (80) is 3-5 mm, and the thickness of the fixing groove bolt nut (80) wall at the midpoint of the regular hexagon is 2-3 mm. After the fixing groove bolt nut (80) is tightened, the length of the lower end of the fixing groove bolt screw (81) exposed from the fixing groove bolt nut (80) is 1 mm. A plurality of fixing groove bolt through holes (82) are arranged at equal intervals in the center of the bottom wall (79) of the fixing plate chute, and the diameter of the cross-section circle of the fixing groove bolt through holes (82) is 3-5 mm. Each fixing plate chute (4) is composed of a fixing plate chute opening (72), a fixing plate chute wall (73), and a fixing plate chute cavity (74). The cross section of the fixed plate slide groove (4) is square as a whole, the outer wall of the fixed plate slide groove (4) is the fixed plate slide groove wall (73), the cavity surrounded by the fixed plate slide groove wall (73) is the fixed plate slide groove cavity (74), the wall at the bottom and center of the fixed plate slide groove (4) with the fixed groove bolt through hole (82) is specifically called the fixed plate slide groove bottom wall (79), and a fixed plate slide groove opening (72) with a width of 3-5 mm is arranged in the center of the top wall of the fixed plate slide groove (4) so ​​that the movable claw plate (8) can slide left and right in the fixed plate slide groove opening (72); the bottom wall and the top wall of the fixed plate slide groove (4) have the same thickness, both of which are 3-5 mm, and the surrounding walls are relatively thin, with a thickness of The movable claw plate (8) is a structure whose lower end is fixed by the fixed plate slide groove (4) and can move left and right along the fixed plate slide groove opening (72) in the fixed plate slide groove cavity (74). It is composed of the movable claw plate top side edge teeth (70), the movable claw plate body (71), the blocking wheel nut (75), the movable claw plate pulley central hole (76), the movable claw plate pulley shaft (77), and the movable claw plate pulley (78). The movable claw plate body (71) is the main body in the center of the movable claw plate (8), which is made of copper, stainless steel or aluminum alloy and is in a rectangular shape. The movable claw plate body (71) has a length of 3-10 cm, a width of 1.5-5 cm, and a thickness of 2.8-4.8 mm; the upper part of the front and rear sides of the movable claw plate body (71) are provided with movable claw plate top side edge teeth (70), and the size and function of each movable claw plate top side edge tooth (70) are the same as those of the push plate wheel edge teeth (94) and the adjusting claw wheel teeth (104), and the only difference is that all the movable claw plate top side edge teeth (70) are arranged on a plane, while the push plate wheel edge teeth (94) and the adjusting claw wheel teeth (104) are arranged on a cylindrical surface; the lower part of the movable claw plate body (71) located in the fixed plate slide groove cavity (74) is provided with a plurality of movable claw plate pulley central holes (76) for the movable claw plate pulley shaft (77) to pass through, and the diameter of the cross-section circle of the movable claw plate pulley central hole (76) is 1-2 mm, and the central axis of all the movable claw plate pulley central holes (76) is located at In one plane, the central axis spacings of two adjacent movable claw plate pulley central holes (76) are equal, both of which are 10 mm; the movable claw plate pulley shaft (77) is made of manganese steel, cylindrical, with a cross-sectional diameter of 0.98-1.98 mm, and the two ends are 0.1-0.2 mm away from the inner surfaces of the two side walls of the fixed plate slide groove wall (73), and the outer surfaces of the two ends are threaded; the movable claw plate pulley (78) is made of manganese steel, and multiple balls are arranged between the center of the movable claw plate pulley (78) and the outer surface of the movable claw plate pulley shaft (77), so that the movable claw plate pulley (78), the steel ball and the movable claw plate pulley shaft (77) together form a bearing structure; the diameter of the blocking wheel nut (75) is half of the diameter of the movable claw plate pulley (78), and the thickness is 1 / 5-1 / 4 of the thickness of the movable claw plate pulley (78).

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