阅读说明：本技术 一种速记绘画教具 (Shorthand drawing teaching aid ) 是由 武玉芝 于 2019-11-11 设计创作，主要内容包括：本发明公开了一种速记绘画教具,包括放置于地面上的绘画台,所述绘画台内固设有开口朝右的升降腔,所述升降腔右端壁连通的设置有开口朝上的绘画板腔,所述绘画板腔内滑动的设置有外绘画板,所述外绘画板内固设有固设有开口朝上的伸展腔所述伸展腔内滑动的设置有内绘画板,所述伸展腔左端壁连通的设置有位于所述外绘画板内的控制伸展腔,所述控制伸展腔下端壁内固设有伸展电机,所述伸展电机的输出轴与所述控制伸展腔的上端壁转动配合连接,所述伸展电机的输出轴外表面设置有伸展部件；本发明结构简单操作方便,闲置使可安置于一个收藏腔内避免落灰,保证绘画用品在搬运过程中不被遗失。(The invention discloses a shorthand drawing teaching aid which comprises a drawing table placed on the ground, wherein a lifting cavity with a right opening is fixedly arranged in the drawing table, a drawing board cavity with an upward opening is arranged on the right end wall of the lifting cavity in a communicated manner, an outer drawing board is arranged in the drawing board cavity in a sliding manner, an extension cavity with an upward opening is fixedly arranged in the outer drawing board, an inner drawing board is arranged in the extension cavity in a sliding manner, a control extension cavity positioned in the outer drawing board is arranged on the left end wall of the extension cavity in a communicated manner, an extension motor is fixedly arranged in the lower end wall of the control extension cavity, an output shaft of the extension motor is connected with the upper end wall of the control extension cavity in a rotating and matching manner, and an extension part is arranged on the outer surface of the output shaft of the extension; the invention has simple structure and convenient operation, can be arranged in a collection cavity to avoid ash falling when being idle, and ensures that the painting article is not lost in the carrying process.)

1. A shorthand drawing teaching aid comprises a drawing table placed on the ground, wherein a lifting cavity with a rightward opening is fixedly arranged in the drawing table, a drawing board cavity with an upward opening is formed in the right end wall of the lifting cavity in a communicated mode, an outer drawing board is arranged in the drawing board cavity in a sliding mode, an extending cavity with an upward opening is fixedly arranged in the outer drawing board, an inner drawing board is arranged in the extending cavity in a sliding mode, a control extending cavity located in the outer drawing board is arranged in the left end wall of the extending cavity in a communicated mode, an extending motor is fixedly arranged in the lower end wall of the control extending cavity, an output shaft of the extending motor is connected with the upper end wall of the control extending cavity in a rotating and matching mode, an extending part is arranged on the outer surface of the output shaft of the extending motor, a swinging cavity with a leftward opening, a lower end wall and the drawing board cavity in a communicated mode is fixedly provided with the inner rotating and extending cavity, a swinging, the lower end face of the swing shaft is fixedly provided with a lifting rod positioned in the drawing board cavity, an extending groove with an opening facing to the left is fixedly arranged in the lifting rod, the lifting rod is arranged in the extending groove in a sliding mode, the left end face of the lifting rod is fixedly provided with a lifting block sliding in the lifting cavity, a lifting motor is fixedly arranged in the lower end wall of the lifting cavity, an output shaft of the lifting motor is connected with the upper end wall of the lifting cavity in a rotating fit mode, a lifting component is arranged in the output shaft of the lifting motor and the lifting block, the left end wall of the lifting cavity is communicated with a meshing cavity, a transmission cavity is arranged on the lower side of the meshing cavity, an angle control cavity with an upward opening is arranged on the right side of the transmission cavity, and inclined components are arranged in the meshing cavity;

the using method comprises the following steps: the lifting component stretches out the drawing board outside, the extension component expands the drawing board, the work of slope part inclines certain angle according to user's writing drawing custom and comfortable degree.

2. A shorthand drawing teaching aid as claimed in claim 1, wherein: the lifting screw thread rotating shaft is arranged in the lifting block in a rotating way and extends out of the lifting block upwards, a first thread groove communicated up and down is fixedly arranged in the lifting thread rotating shaft, an output shaft of the lifting motor penetrates through the first thread groove and is in thread fit connection with the end wall of the first thread groove, an elastic groove with an opening facing right is fixedly arranged in the lifting block, a sliding cavity communicated up and down is arranged on the upper end wall of the elastic groove, an elastic block is arranged in the elastic groove in a sliding manner, a spring is arranged between the left end surface of the elastic block and the left end wall of the elastic groove, under the action of the spring, the right end surface of the elastic block is engaged and matched with the left end surface of the lifting threaded rotating shaft, the elastic block is internally and fixedly provided with an extrusion cavity which is communicated with the sliding cavity up and down, an extrusion rod which extends into the lifting cavity upwards is arranged in the sliding cavity in a sliding mode, and the lower end face of the extrusion rod is of an inclined plane structure.

3. A shorthand drawing teaching aid as claimed in claim 1, wherein: an elastic extension groove is communicated with the left end wall of the sliding cavity, an elastic extension block fixedly matched and connected with the left end face of the extrusion rod is arranged in the elastic extension groove in a sliding mode, a spring is arranged between the lower end face of the elastic extension block and the lower end wall of the elastic extension groove, a through cavity which is located in the lifting cavity and communicated with the left and the right is fixedly arranged in the extrusion rod, a first gear which is located in the lifting cavity and penetrates through the through cavity is fixedly arranged on the outer surface of the lifting threaded rotating shaft, and the extrusion rod can extrude the elastic block to move left when sliding downwards;

during the use, elevator motor work makes earlier the elevator block upwards removes, drives in the outer drawing board roll-off device, work as crowded pole up end with lift chamber up end wall is supported when receiving the extrusion, crowded pole can with the bullet piece removes left, makes the lift screw thread pivot is in rotatable state.

4. A shorthand drawing teaching aid as claimed in claim 1, wherein: the drawing board is characterized in that a control stretching block is arranged in the control stretching cavity in a sliding manner, a stretching threaded rotating shaft is arranged in the control stretching block in a rotating manner, a second threaded groove communicated up and down is fixedly arranged in the stretching threaded rotating shaft, an output shaft of a stretching motor penetrates through the second threaded groove and is in threaded fit connection with the end wall of the second threaded groove, a transverse moving groove with an opening facing left is fixedly arranged in the control stretching block, a stretching gear positioned in the transverse moving groove is fixedly arranged on the outer surface of the stretching threaded rotating shaft, a transverse moving block which is in sliding connection with the transverse moving groove is arranged on the rear end face of the stretching gear in a meshed manner, and the right end face of the transverse moving block is fixedly matched and connected with;

when the control stretching gear is in a rotatable state, the stretching motor continuously works to enable the transverse moving block to drive the inner drawing board to move rightwards.

5. A shorthand drawing teaching aid as claimed in claim 1, wherein: meshing intracavity pivoted be provided with stretch into second gear in the lift intracavity, second gear internal set have with the transmission vertical axis that meshing chamber upper end wall normal running fit is connected, the downward pivoted of transmission vertical axis penetrates the transmission intracavity and with transmission chamber lower end wall normal running fit is connected, transmission vertical axis lower terminal surface has set firmly and is located the third gear of transmission intracavity, the meshing of third gear left end face is provided with the fourth gear, the transmission cross axle has set firmly in the fourth gear, the transmission cross axle with transmission chamber left end wall normal running fit is connected, and the pivoted right penetrates the angle control intracavity with angle control chamber right-hand member wall normal running fit is connected, the surface screw-thread fit of transmission cross axle be connected be provided with the screw thread piece that angle control chamber lower end wall normal running fit is connected.

6. A shorthand drawing teaching aid as claimed in claim 1, wherein: a sliding rod is fixedly arranged on the upper end face of the threaded block, a control angle block is slidably arranged on the outer surface of the sliding rod, a painting part cavity with an upward opening is fixedly arranged in the control angle block, a plurality of pulleys are rotatably arranged in the lower end face of the control angle block, a lower fixing block is fixedly arranged on the lower end face of the outer painting board, a rotating shaft fixedly matched and connected with the left end face of the control angle block is rotatably arranged in the lower fixing block, and painting parts and materials are arranged in the painting part cavity;

when the angle control device is used, the upward movement of the outer drawing board drives the angle control block to move upward, when the outer drawing board moves upward to the limit position, the pulley just moves out of the angle control cavity, the first gear rotates to drive the second gear to rotate, the transmission cross shaft rotates, and therefore the pulley moves rightward and rolls against the upper end face of the drawing table, the rotating shaft is pulled to move rightward, and finally the angle of inclination of the outer drawing board is made.

Technical Field

The invention relates to the field of drawing, in particular to a shorthand drawing teaching aid.

Background

Present drawing board and the device that supports drawing board are separately put, though indoor use is not influenced, but carry out drawing work outdoor when needs, for example paint from life, when carrying drawing board and drawing instrument, because the drawing instrument is more, need carry many times in the handling, and lose the drawing instrument that drops easily to because the instrument that supports drawing board is great and drawing board is great, inconvenient carrying, this problem is effectively solved to this device.

Disclosure of Invention

The invention aims to provide a shorthand drawing teaching aid which can overcome the defects in the prior art.

According to the invention, the shorthand drawing teaching aid comprises a drawing table placed on the ground, wherein a lifting cavity with a rightward opening is fixedly arranged in the drawing table, a drawing board cavity with an upward opening is arranged in communication with the right end wall of the lifting cavity, an outer drawing board is arranged in the drawing board cavity in a sliding manner, an extension cavity with an upward opening is fixedly arranged in the outer drawing board, an inner drawing board is arranged in the extension cavity in a sliding manner, a control extension cavity positioned in the outer drawing board is arranged in communication with the left end wall of the extension cavity, an extension motor is fixedly arranged in the lower end wall of the control extension cavity, an output shaft of the extension motor is connected with the upper end wall of the control extension cavity in a rotating fit manner, an extension part is arranged on the outer surface of the output shaft of the extension motor, a pendulum cavity with an leftward opening and a lower end wall communicated with the drawing board cavity is fixedly arranged in the outer drawing board, the utility model discloses a drawing board, including pendulum cavity, lifting block, pendulum cavity, lifting chamber, transmission chamber, angle control chamber, pendulum cavity upper end wall internal rotation be provided with the pendulum axle, the terminal surface sets firmly to be located under the pendulum axle the lifter of drawing board intracavity, the extension groove that the opening is towards the left has set firmly in the lifter, the gliding lifter that is provided with in the extension groove, the lifter left end face set firmly slide in the lifter intracavity, the lifting chamber lower end wall internal setting has elevator motor, elevator motor's output shaft with lifting chamber upper end wall normal running fit connects, elevator motor's output shaft with be provided with lifting unit in the lifter, the meshing chamber that is provided with of lifting chamber left end wall intercommunication, meshing chamber downside is provided with the transmission chamber, transmission chamber right side is provided with opening angle control chamber upwards, meshing chamber, transmission chamber and angle control intracavity are provided with the.

A lifting threaded rotating shaft is arranged in the lifting block in a rotating manner and extends upwards out of the lifting block, a first threaded groove communicated up and down is fixedly arranged in the lifting threaded rotating shaft, an output shaft of the lifting motor penetrates through the first threaded groove and is in threaded fit connection with the end wall of the first threaded groove, an elastic groove with an opening facing right is fixedly arranged in the lifting block, a sliding cavity communicated up and down is arranged in the upper end wall of the elastic groove in a communicating manner, an elastic block is arranged in the elastic groove in a sliding manner, a spring is arranged between the left end surface of the elastic block and the left end wall of the elastic groove, the right end surface of the elastic block is in meshed fit connection with the left end surface of the lifting threaded rotating shaft under the action of the spring, an extrusion cavity communicated up and down and is fixedly arranged in the elastic block and is communicated with the sliding cavity, and an extrusion rod extending upwards into the lifting cavity is arranged in the sliding cavity in a sliding manner, the lower end face of the extrusion rod adopts an inclined plane structure.

A further technical scheme, wherein, what slide chamber left end wall communicate is provided with the bullet and stretches the groove, bullet stretch inslot gliding be provided with the bullet that crowded pole left end face fixed fit is connected stretches the piece, bullet stretch under the piece terminal surface with the bullet is provided with the spring under the groove between the terminal wall, crowded pole internal fixation has to be located go up and down the intracavity and control intercommunication lead to the chamber, lift screw thread pivot surface has set firmly to be located go up and down the intracavity and pass lead to the first gear in chamber, can extrude when crowded pole slides down the bullet piece removes left.

According to the technical scheme, a control extension block is arranged in the control extension cavity in a sliding mode, an extension thread rotating shaft is arranged in the control extension block in a rotating mode, a second thread groove which is communicated up and down is fixedly arranged in the extension thread rotating shaft, an output shaft of an extension motor penetrates through the second thread groove and is in threaded fit connection with the end wall of the second thread groove, a transverse moving groove with an opening facing left is fixedly arranged in the control extension block, an extension gear located in the transverse moving groove is fixedly arranged on the outer surface of the extension thread rotating shaft, a transverse moving block which is in sliding connection with the transverse moving groove is arranged on the rear end face of the extension gear in a meshed mode, and the right end face of the transverse moving block is fixedly matched and connected with the left end face of the inner.

In a further technical scheme, a second gear extending into the lifting cavity is rotatably arranged in the meshing cavity, a transmission vertical shaft which is in rotating fit connection with the upper end wall of the meshing cavity is fixedly arranged in the second gear, the transmission vertical shaft is downwards rotated, penetrates into the transmission cavity and is in rotating fit connection with the lower end wall of the transmission cavity, a third gear positioned in the transfer cavity is fixedly arranged on the lower end surface of the transfer vertical shaft, a fourth gear is meshed with the left end surface of the third gear, a transmission cross shaft is fixedly arranged in the fourth gear, the transmission cross shaft is connected with the left end wall of the transmission cavity in a rotating fit manner, and the right-hand rotating sleeve penetrates into the angle control cavity and is connected with the right end wall of the angle control cavity in a rotating fit manner, and the outer surface of the transmission transverse shaft is provided with a thread block in threaded fit connection with the lower end wall of the angle control cavity.

Further technical scheme, wherein, the screw thread piece up end has set firmly the slide bar, the gliding control angle piece that is provided with of surface of slide bar, the ascending drawing part chamber of opening has set firmly in the control angle piece, the terminal surface pivoted is provided with a plurality of pulley under the control angle piece, the terminal surface has set firmly solid piece down under the outer drawing board, solid piece internal rotation down be provided with the pivot that control angle piece left end face fixed fit is connected, drawing part and material are equipped with in the drawing part chamber.

The invention has the beneficial effects that: the device has a simple structure, is convenient to use, and when the device is not used, the drawing board and the drawing tools are hidden in the device to form a whole, so that the device only needs to be carried once in the carrying process, the drawing tools cannot fall off or be lost in the carrying process, and the device folds the drawing board, thereby greatly reducing the occupied space of the device and effectively improving the convenience of the device.

The above description is only an embodiment of the invention, but the scope of the invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the invention. Therefore, the protection scope of the invention should be subject to the protection scope defined by the claims.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

FIG. 1 is a schematic overall structure diagram of a shorthand drawing teaching aid according to the present invention;

FIG. 2 is an enlarged schematic view of "A" in FIG. 1;

fig. 3 is an enlarged structural view of "B" in fig. 1.

Detailed Description

All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.

Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.

For ease of description, as shown in fig. 1-3, the orientations described below are now defined as follows: the following up-down left-right front-back direction is consistent with the up-down left-right front-back direction of the projection relation of the drawing 1, the shorthand drawing teaching aid comprises a drawing table 10 placed on the ground, a lifting cavity 15 with a right opening is fixedly arranged in the drawing table 10, a drawing board cavity 21 with an upward opening is arranged in the communication of the right end wall of the lifting cavity 15, an outer drawing board 36 is arranged in the drawing board cavity 21 in a sliding manner, an extension cavity 33 with an upward opening is fixedly arranged in the outer drawing board 36, an inner drawing board 34 is arranged in the extension cavity 33 in a sliding manner, a control extension cavity 35 positioned in the outer drawing board 36 is arranged in the communication of the left end wall of the extension cavity 33, an extension motor 54 is fixedly arranged in the lower end wall of the control extension cavity 35, an output shaft of the extension motor 54 is connected with the upper end wall of the control extension cavity 35 in a rotating and matching manner, an extension part is arranged on the outer surface, the outer drawing board 36 is internally and fixedly provided with a swinging cavity 14 with an opening facing left and a lower end wall communicated with the drawing board cavity 21, the upper end wall of the swinging cavity 14 is rotationally provided with a swinging shaft 13, the lower end surface of the swinging shaft 13 is fixedly provided with a lifting rod 23 positioned in the drawing board cavity 21, the lifting rod 23 is internally and fixedly provided with an extending groove 24 with an opening facing left, the extending groove 24 is internally and slidably provided with the lifting rod 23, the left end surface of the lifting rod 23 is fixedly provided with a lifting block 16 sliding in the lifting cavity 15, the lower end wall of the lifting cavity 15 is internally and fixedly provided with a lifting motor 48, an output shaft of the lifting motor 48 is in rotating fit connection with the upper end wall of the lifting cavity 15, an output shaft of the lifting motor 48 is provided with a lifting part in the lifting block 16, the left end wall of the lifting cavity 15 is communicated with a meshing cavity 11, the lower side of the meshing cavity 11 is provided with a transfer cavity 17, the right side of the transfer cavity 17 is, inclined parts are provided in the engagement chamber 11, the transfer chamber 17 and the angle control chamber 28.

Advantageously, a lifting threaded rotating shaft 46 is rotatably disposed in the lifting block 16, the lifting threaded rotating shaft 46 extends upward out of the lifting block 16, a first threaded groove 47 communicating with each other up and down is fixedly disposed in the lifting threaded rotating shaft 46, an output shaft of the lifting motor 48 penetrates through the first threaded groove 47 and is in threaded fit connection with an end wall of the first threaded groove 47, a spring groove 42 with a right opening is fixedly disposed in the lifting block 16, a sliding cavity 44 communicating with each other up and down is disposed in communication with an upper end wall of the spring groove 42, a spring block 43 is slidably disposed in the spring groove 42, a spring is disposed between a left end surface of the spring block 43 and a left end wall of the spring groove 42, under the action of the spring, a right end surface of the spring block 43 is in meshed fit connection with a left end surface of the lifting threaded rotating shaft 46, a squeezing cavity 45 communicating with each other up and down and is fixedly disposed in the spring block 43 and is in communication with the sliding, the sliding cavity 44 is internally provided with a squeezing rod 39 which extends upwards into the lifting cavity 15 in a sliding mode, and the lower end face of the squeezing rod 39 is of an inclined plane structure.

Advantageously, an elastic extension groove 57 is formed in the left end wall of the sliding cavity 44 in a communicating manner, an elastic extension block 58 fixedly connected with the left end face of the extrusion rod 39 in a matching manner is arranged in the elastic extension groove 57 in a sliding manner, a spring is arranged between the lower end face of the elastic extension block 58 and the lower end wall of the elastic extension groove 57, a through cavity 40 which is positioned in the lifting cavity 15 and communicated with the left and the right is fixedly arranged in the extrusion rod 39, a first gear 38 which is positioned in the lifting cavity 15 and penetrates through the through cavity 40 is fixedly arranged on the outer surface of the lifting threaded rotating shaft 46, and the extrusion rod 39 can extrude the elastic block 43 to move leftwards when sliding downwards.

Advantageously, a control extension block 50 is slidably disposed in the control extension cavity 35, an extension threaded rotating shaft 53 is rotatably disposed in the control extension block 50, a second threaded groove 55 communicating with each other up and down is fixedly disposed in the extension threaded rotating shaft 53, an output shaft of the extension motor 54 penetrates through the second threaded groove 55 and is in threaded fit connection with an end wall of the second threaded groove 55, a traverse groove 51 with an opening facing to the left is fixedly disposed in the control extension block 50, an extension gear 56 disposed in the traverse groove 51 is fixedly disposed on an outer surface of the extension threaded rotating shaft 53, a traverse block 52 slidably disposed in the traverse groove 51 is disposed in engagement with a rear end surface of the extension gear 56, and a right end surface of the traverse block 52 is fixedly fit connected with a left end surface of the inner drawing board 34.

Advantageously, wherein a second gear 37 extending into the lifting chamber 15 is rotatably arranged in the engagement chamber 11, a transmission vertical shaft 12 which is in running fit connection with the upper end wall of the meshing cavity 11 is fixedly arranged in the second gear 37, the vertical transmission shaft 12 penetrates into the transmission cavity 17 in a downward rotating way and is connected with the lower end wall of the transmission cavity 17 in a rotating matching way, a third gear 20 positioned in the transfer cavity 17 is fixedly arranged on the lower end surface of the transfer vertical shaft 12, a fourth gear 19 is arranged on the left end surface of the third gear 20 in a meshed manner, a transmission transverse shaft 18 is fixedly arranged in the fourth gear 19, the transmission transverse shaft 18 is connected with the left end wall of the transmission cavity 17 in a rotating fit manner, and the right-hand rotating rod penetrates into the angle control cavity 28 to be connected with the right end wall of the angle control cavity 28 in a rotating fit manner, the outer surface of the transmission transverse shaft 18 is provided with a thread block 27 in threaded fit connection with the lower end wall of the angle control cavity 28 in sliding fit connection.

Advantageously, a sliding rod 29 is fixedly arranged on the upper end face of the thread block 27, a control angle block 31 is slidably arranged on the outer surface of the sliding rod 29, a drawing part cavity 32 with an upward opening is fixedly arranged in the control angle block 31, a plurality of pulleys 30 are rotatably arranged in the lower end face of the control angle block 31, a lower fixed block 25 is fixedly arranged on the lower end face of the outer drawing board 36, a rotating shaft 26 fixedly connected with the left end face of the control angle block 31 in a matched manner is rotatably arranged in the lower fixed block 25, and drawing parts and materials are arranged in the drawing part cavity 32.

When the equipment is in an initial state, the lifting motor 48 and the extension motor 54 are in a stop working state, and the lower end surface of the lifting block 16 is abutted against the lower end wall of the lifting cavity 15, so that the structure is positioned at an initial position in the initial state, and can be adjusted in subsequent work, and the working coordination of the equipment is effectively improved.

When the device works, the lifting motor 48 works, because the elastic block 43 clamps the lifting threaded rotating shaft 46, the lifting threaded rotating shaft 46 does not rotate, and because the first threaded groove 47 is in threaded fit connection with the output shaft of the lifting motor 48, the lifting threaded rotating shaft 46 drives the lifting block 16 to move upwards, so that the extension rod 22 drives the outer drawing board 36 to move upwards, when the lifting block 16 moves upwards until the upper end surface of the extrusion rod 39 abuts against the upper end wall of the lifting cavity 15, the continuous work of the lifting motor 48 enables the upper end wall of the lifting cavity 15 to extrude the extrusion rod 39, so that the extrusion rod 39 moves downwards relative to the lifting block 16, the lower end surface of the fourth gear 19 slides into the extrusion cavity 45 and extrudes the extrusion cavity 45, so that the elastic block 43 moves leftwards, when the outer drawing board 36 moves upwards out of the drawing board cavity 21, the spring block 43 moves leftwards to disengage from the engagement connection with the lifting screw rotating shaft 46, and the first gear 38 is engaged with the second gear 37, the lifting motor 48 continues to operate to rotate the first gear 38, the second gear 37 is rotated due to the engagement connection of the first gear 38 with the second gear 37, so that the transmission vertical shaft 12 drives the third gear 20 to rotate, the transmission horizontal shaft 18 is rotated due to the engagement connection of the third gear 20 with the fourth gear 19, the transmission horizontal shaft 18 is rotated, the screw block 27 is moved rightwards due to the screw engagement connection of the screw block 27 with the transmission horizontal shaft 18, the control angle block 31 is moved upwards due to the sliding engagement connection of the slide bar 29 with the control angle block 31, and when the outer drawing board 36 moves upwards to the top, the lower end surface of the pulley 30 is exactly in the same horizontal position as the upper end surface of the drawing table 10, the right movement of the thread block 27 moves the control angle block 31 to the right, and the pulley 30 slides on the upper end surface of the drawing table 10, because the rotating shaft 26 is connected with the lower fixed block 25 in a rotating fit manner, the lifting rod 23 is connected in the extending groove 24 in a sliding fit manner, the swinging shaft 13 is connected with the upper end wall of the swinging cavity 14 in a rotating fit manner, the right movement of the control angle block 31 rotates the outer drawing board 36, the operation of the lifting motor 48 is stopped when the rotating shaft rotates to a proper angle, then the extending motor 54 is operated, because the inner drawing board 34 is still located in the extending cavity 33, the traverse block 52 is restricted from moving to the right, so that the extending thread rotating shaft 53 is not rotated, because the second thread groove 55 is connected with the output shaft of the extending motor 54 in a threaded fit manner, the extension threaded rotating shaft 53 carries the control extension block 50 to move upwards, so that the inner drawing board 34 moves upwards, when the inner drawing board 34 moves upwards and slides out of the extension cavity 33, the upper end surface of the control extension block 50 abuts against the upper end wall of the control extension cavity 35, at this time, the inner drawing board 34 can move rightwards, so that the traverse block 52 is in a movable state, the extension threaded rotating shaft 53 is in a rotating state, the extension motor 54 continues to work, so that the extension threaded rotating shaft 53 rotates, so that the lifting threaded rotating shaft 46 rotates, as the extension gear 56 is in meshing fit connection with the traverse groove 51, the traverse block 52 moves rightwards, so that the inner drawing board 34 moves rightwards until the right end surface of the inner drawing board 34 and the right end surface of the outer drawing board 36 are in the same vertical position, when the lifting motor 48 rotates reversely, because the pulley 30 is connected with the upper end surface of the drawing board 10 in a sliding fit manner, the reverse rotation of the lifting motor 48 firstly makes the control angle block 31 slide leftwards to the position right above the angle control cavity 28, so that the outer drawing board 36 rotates back to the vertical state.

The invention has the beneficial effects that: the device has a simple structure, is convenient to use, and when the device is not used, the drawing board and the drawing tools are hidden in the device to form a whole, so that the device only needs to be carried once in the carrying process, the drawing tools cannot fall off or be lost in the carrying process, and the device folds the drawing board, thereby greatly reducing the occupied space of the device and effectively improving the convenience of the device.

The above description is only an embodiment of the invention, but the scope of the invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the invention. Therefore, the protection scope of the invention should be subject to the protection scope defined by the claims.