CN216833014U - Portable extensible space-enlarging hand-drawing board for industrial art - Google Patents

Abstract

The utility model provides a board is painted to portable industrial art hand that can extend and enlarge space relates to the hand and paints board technical field. Including the mainboard, first subplate and second subplate, the mainboard, first subplate and second subplate all include working face and the back face, the working face all is provided with the metal level, the back face edge of mainboard is provided with the slide bar, be provided with the sliding tray in the slide bar, the one end of first subplate and second subplate sets up the sliding plate, the both sides of sliding plate are provided with loose pulley assembly, loose pulley assembly and the sliding tray sliding connection of slide bar, the spread groove has been seted up to the lateral wall of mainboard, first subplate and second subplate still are provided with the joint board along the last edge of sliding plate, the spread groove can be dismantled with the joint board and be connected, it is better to have stability, excellent in connection effect, the characteristics that the structure principle is uncomplicated.

Description

Portable extensible space-enlarging hand-drawing board for industrial art

Technical Field

The utility model relates to a board technical field is painted to the hand, particularly, relates to a board is painted to portable artistic craft hand that extends and enlarge space.

Background

The art design is an independent art subject, is a term, and mainly comprises: the environment design professional direction, the plane design professional direction, the visual transmission professional direction, the product design professional direction, and the like. The research content and the service object of the system are different from the traditional art categories; meanwhile, the art design is a subject with extremely strong comprehensiveness, and relates to social, cultural, economic, market, science and technology and other factors, and the aesthetic standard of the art design is changed along with the change of the factors. The artistic design is actually the embodiment of the comprehensive quality (such as expressive ability, perception ability and imagination ability) of the designer. For the design with own aesthetic feeling, computer drawing or hand drawing is generally adopted for storage, and some designs can also be used as artwork; in the hand drawing, a hand drawing board is used for drawing during school learning or outdoor wind collection.

In the prior art, the hand-drawing board has a plurality of extension spaces, but the structure is complex and the stability is not enough. Therefore, the prior art has yet to be improved.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a board is painted to portable artistic craft hand that expands space, it can be directed against in the not enough of prior art, proposes the solution, and it is better to have stability, and the linkage effect is good, characteristics that the structure principle is uncomplicated.

The embodiment of the utility model is realized like this:

portable extension enlarges artistic craft hand drawing board in space, including mainboard, first subplate and the vice board of second, mainboard, first subplate and the vice board of second all include working face and the back face, the working face all is provided with the metal level, the back face edge of mainboard is provided with the slide bar, is provided with the sliding tray in the slide bar, the one end of first subplate and second subplate sets up the sliding plate, the both sides of sliding plate are provided with loose pulley assembly, loose pulley assembly and the sliding tray sliding connection of slide bar, the spread groove has been seted up to the lateral wall of mainboard, first subplate and the vice board of second are still provided with the joint board on the last edge of sliding plate, the spread groove with the joint board can be dismantled and be connected.

Further, in some embodiments of the present invention, the above sliding rod includes a vertical plate and a limiting plate, the upper end of the vertical plate is connected to the main board, the lower end of the vertical plate is connected to the limiting plate, and the vertical plate has two sliding grooves.

Further, in some embodiments of the present invention, the sliding groove includes a first straight groove, a second straight groove and a curved groove which are communicated with each other, forming a hook type sliding groove.

Further, in some embodiments of the present invention, the pulley assembly includes a roller, a bearing is embedded in the roller, the bearing is internally and fixedly connected with a rotating rod, the other end of the rotating rod is connected with the sliding plate, a groove is formed on a wall of the roller, and the roller passes through the groove and the sliding groove.

Further, in some embodiments of the present invention, the length of the sliding plate is greater than the length of the engaging plate, and the length of the engaging plate is equal to or less than the depth of the connecting groove.

Further, in some embodiments of the present invention, an arc portion is disposed at one end of the clamping plate connected to the connecting groove.

Further, in some embodiments of the present invention, the distance between the upper edge of the connecting groove and the working surface of the main board is equal to the distance between the clamping plate and the working surface of the first secondary board or the second secondary board.

Further, in some embodiments of the present invention, a distance between a lower edge of the connecting groove and a rear back surface of the main plate is equal to a distance between the fastening plate and the sliding plate.

Further, in some embodiments of the present invention, the back of the main board is provided with a central portion and a stable rotation fixing member for fixing the first or second sub board to the main board, and the central portion is provided with a fastening member for connecting a foldable foot stand.

Further, in some embodiments of the present invention, the first auxiliary board or the second auxiliary board is provided with a pull strip, and the main board is provided with a pull strip.

The embodiment of the utility model provides an at least, have following advantage or beneficial effect:

the effect is first, and the stability is better; the utility model discloses an including the mainboard, first subplate and second subplate, the mainboard, first subplate and second subplate all include working face and the back, the working face all is provided with the metal level, the back edge of mainboard is provided with the slide bar, be provided with the sliding tray in the slide bar, the one end of first subplate and second subplate sets up the sliding plate, the both sides of sliding plate are provided with loose pulley assembly, loose pulley assembly and the sliding tray sliding connection of slide bar, the spread groove has been seted up to the lateral wall of mainboard, first subplate and second subplate are still provided with the joint board on the sliding plate along, the technical scheme of being connected can be dismantled with the joint board to the spread groove. When concrete implementation, first subplate and the vice board of second slide in the slide bar of mainboard through the loose pulley assembly of both sides, when sliding to the edge, furtherly, above-mentioned sliding tray is including the first straight groove that communicates each other, the straight groove of second and crook, forms crotch type sliding tray for the sliding assembly up slides and enters into the straight groove of second through the crook in, and back pushes away, and at this moment, the direct joint of joint board goes into the spread groove, realizes stabilizing the joint. Further, the back is provided with rotatory mounting behind the mainboard, is fixed in the spread groove when above-mentioned joint board joint for behind first subplate or second subplate and mainboard fixed connection, rotate out the rotatory mounting that sets up again, make its first subplate or second subplate and mainboard further stable, improve the utility model discloses a stability. Meanwhile, due to the fact that the sliding connection is achieved, good storage can be achieved, portability is improved, and the carrying is convenient.

The effect is two, and the connecting effect is good; in addition to the above, relatively good connection stability can be realized, the main board, the first auxiliary board and the second auxiliary board are also used for being connected with each other in a sliding manner, the sliding groove comprises a first straight groove, a second straight groove and a curved groove which are communicated with each other, so that a hook-type sliding groove is formed, after the pulley assembly of the first auxiliary board or the second auxiliary board can slide in the sliding groove of the main board, when the pulley assembly slides to the edge of the main board or reaches the curved groove, the sliding board, the clamping board and the whole body move upwards at the moment, then the sliding board enters the second straight groove and is pushed reversely, so that the clamping board is integrally clamped and enters the connecting groove; furthermore, the distance between the upper edge of the connecting groove and the working surface of the main board is equal to the distance between the clamping plate and the working surface of the first auxiliary board or the second auxiliary board, and the distance between the lower edge of the connecting groove and the back surface of the main board is equal to the distance between the clamping plate and the sliding plate, so that after the working surfaces of the first auxiliary board and the second auxiliary board are connected with the working surface of the main board, the two auxiliary boards are connected in a flat manner, the whole connecting effect is good, and more use functions can be realized. Simultaneously, all be provided with the metal level at the working face of mainboard, first subplate and second subplate, can realize general the utility model discloses regard as exhibition board or show board temporarily, perhaps teaching board utilizes the magnet piece can adsorb file or works on mainboard and first subplate and second subplate, and the function is diversified, utilizes connection each other, realizes the variety of usage.

The effect is three, the structure principle is not complex; the utility model does not adopt electric components and complicated mechanical mechanisms and equipment, and can solve the problems that the connection effect is general, the connection is not flat, the direct use can not be realized, and the structure is not complex while the connection stability is ensured by simple mechanical connection and transformation; the technical scheme can be easily understood and implemented by the technical personnel in the field, and has better market promotion prospect.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on these drawings without inventive efforts.

FIG. 1 is a schematic view of the connection of the overall structure of the embodiment of the present invention;

FIG. 2 is a schematic view of a rear connection according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a main board according to an embodiment of the present invention;

FIG. 4 is a schematic view of a first or second sub-plate according to an embodiment of the present invention;

fig. 5 is a schematic view of a pulley assembly connection according to an embodiment of the present invention;

fig. 6 is a schematic cross-sectional view of a pulley assembly according to an embodiment of the present invention.

Icon: 1-main plate, 2-first subplate, 3-second subplate, 4-working surface, 5-back surface, 6-sliding groove, 7-sliding bar, 8-first straight groove, 9-second straight groove, 10-curved groove, 11-sliding plate, 12-snap plate, 13-connecting groove, 14-riser, 15-limiting plate, 16-roller, 17-groove, 18-bearing, 19-rotating bar, 20-arc part, 21-rotating fixing part, 22-snap part, 23-pulling belt, 24-pulling belt.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the embodiments of the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, the description is only for convenience of description of the present invention and simplification, but the indication or suggestion that the device or element to be referred must have a specific position, be constructed and operated in a specific position, and therefore, the present invention should not be construed as being limited thereto. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not require that the components be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the embodiments of the present invention, it should be further noted that unless explicitly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Examples

Referring to fig. 1-6, an embodiment of the present invention is specifically shown in fig. 1-6.

As shown in fig. 1-4, the present embodiment provides a portable extendable space-enlarging hand drawing board for arts and crafts, comprising a main board 1, a first auxiliary board 2 and a second auxiliary board 3, wherein the main board 1, the first auxiliary board 2 and the second auxiliary board 3 each comprise a working surface 4 and a back surface 5, the working surfaces 4 are all provided with a metal layer (not specifically shown in the drawings), a sliding rod 7 is arranged at the edge of the back surface 5 of the main board 1, a sliding slot 6 is arranged in the sliding rod 7, and the sliding slot 6 comprises a first straight slot 8, a second straight slot 9 and a curved slot 10 which are communicated with each other to form a curved hook type sliding slot 6. One end of the first auxiliary plate 2 and the second auxiliary plate 3 is provided with a sliding plate 11, two sides of the sliding plate 11 are provided with pulley assemblies, the pulley assemblies are slidably connected with a sliding groove 6 of the sliding rod 7, the side wall of the main plate 1 is provided with a connecting groove 13, the first auxiliary plate 2 and the second auxiliary plate 3 are further provided with a clamping plate 12 on the upper edge of the sliding plate 11, and the connecting groove 13 is detachably connected with the clamping plate 12.

In the specific implementation, if need great hand drawing board space, can draw first auxiliary board 2 and second auxiliary board 3 out from the both ends of mainboard 1, at this in-process, first auxiliary board 2 and second auxiliary board 3 slide in the slide bar 7 of mainboard 1 through the pulley assembly of both sides, when sliding to the edge, the user lifts up a little for pulley assembly enters into curved groove 10 from first straight groove 8, reach the tail end of curved groove 10 this moment after, joint board 12 is parallel with spread groove 13, push back whole first auxiliary board 2 and second auxiliary board 3, slide assembly slides in second straight groove 9, until it reaches the tail end of second straight groove 9, make joint board 12 joint enter into spread groove 13 and realize stable connection, just can normal use. If when the portable list of the party of taking in, only need draw out the back with first auxiliary board 2 and second auxiliary board 3 from the spread groove 13 of mainboard 1, then press down its messenger's into curved groove 10 a little, in the same way, then the slip subassembly of first auxiliary board 2 and second auxiliary board 3 enters into first straight groove 8, and at this moment, the back 5 of mainboard 1 is accomodate to first auxiliary board 2 and second auxiliary board 3, conveniently carries. Simultaneously, all be provided with the metal level at mainboard 1, first subplate 2 and the working face 4 of the vice board 3 of second, can realize inciting somebody to action the utility model discloses regard as exhibition board or show board temporarily, perhaps teaching board utilizes the magnet piece can adsorb file or works on mainboard 1 and first subplate 2 and the vice board 3 of second, and the function is diversified, utilizes connection each other, realizes the variety of usage.

As shown in fig. 3, in the present embodiment, the sliding rod 7 includes a vertical plate 14 and a limiting plate 15, an upper end of the vertical plate 14 is connected to the main board 1, a lower end of the vertical plate 14 is connected to the limiting plate 15, and two sliding grooves 6 are formed in the vertical plate 14.

The sliding grooves 6 in the riser 14 are connected to the sliding assembly of the first and second sub-panels 2, 3 so as to be slidable relative to each other therein. And limiting plate 15 can restrict the thickness of accomodating of first subplate 2 and second subplate 3 on the one hand, and on the other hand, also can avoid when pulley assembly probably damages, first subplate 2 and second subplate 3 fall from the back 5 of mainboard 1.

As shown in fig. 5-6, in the present embodiment, the pulley assembly includes a roller 16, a bearing 18 is embedded in the roller 16, a rotating rod 19 is fixedly connected in the bearing 18, the other end of the rotating rod 19 is connected to the sliding plate 11, a groove 17 is formed on a wall of the roller 16, and the roller 16 is connected to the sliding groove 6 through the groove 17.

In practice, the recess 17 joint of gyro wheel 16 enters into sliding tray 6, utilizes dwang 19 to connect bearing 18 and sliding plate 11, realizes mutual slip, can realize first auxiliary board 2 and the mutual slip of second auxiliary board 3 mainboard 1 again, and the tensile combination of being convenient for is accomodate with the shrink.

As shown in fig. 4, in the present embodiment, the length of the sliding plate 11 is greater than the length of the clamping plate 12, and the length of the clamping plate 12 is equal to or less than the depth of the connecting slot 13.

So set up, when realizing the equipment, sliding plate 11 remains the below of mainboard 1, and joint board 12 gets into connecting groove 13, and connecting groove 13 degree of depth then must guarantee at least not to be less than the length of joint board 12, can realize stable connection.

As shown in fig. 3, in the present embodiment, an arc portion 20 is provided at one end of the engagement plate 12 connected to the connection groove 13.

The front end of the engagement plate 12 is provided with the arc-shaped portion 20, so that it is possible to more easily enter the coupling groove 13.

In the present embodiment, the distance between the upper edge of the connecting slot 13 and the working surface 4 of the main board 1 is equal to the distance between the engaging plate 12 and the working surface 4 of the first secondary board 2 or the second secondary board 3. The distance between the lower edge of the connecting slot 13 and the back surface 5 of the main plate 1 is equal to the distance between the snap plate 12 and the sliding plate 11.

So set up and to make the working face 4 of first subplate 2 and second subplate 3 be connected the back with the working face 4 of mainboard 1, both are connected with pure flat for holistic linkage effect is good, can realize more service functions. When connected, clamping plate 12 is clamped with connecting groove 13, and sliding plate 11 is located on back surface 5 of main plate 1.

As shown in fig. 2, in the present embodiment, a middle portion and a rotation fixing member 21 for fixing the stable connection between the first sub-board 2 or the second sub-board 3 and the main board 1 are disposed on the rear surface of the main board 1, and a snap-in member 22 for connecting a foldable stand is disposed on the middle portion.

After the working surfaces 4 of the first and second sub-plates 2 and 3 are connected with the working surface 4 of the main plate 1, and the two are connected with each other in a flat manner, the rotating and fixing member 21 is twisted to the joint of the two, and the rotating and fixing member 21 is matched with the main plate 1 and the working surfaces 4 of the first and second sub-plates 2 and 3 in shape. General hand drawing board all can be external has the foot rest, this foot rest can with the utility model discloses carry out the joint, realize dismantling the connection.

As shown in fig. 2 to 4, in the present embodiment, the first sub-panel 2 or the second sub-panel 3 is provided with a drawing strip 23, and the main panel 1 is provided with a drawing strip 24. So set up, can be convenient for the utility model discloses carrying out the first subplate of pull 2 and the vice board 3 of second, realizing the fast assembly extension, increase usable floor area is of course also convenient for accomodate. The lifting belt 24 of the main board 1 is convenient for carrying.

To sum up, the embodiment of the utility model provides a through including mainboard 1, first subplate 2 and second subplate 3, mainboard 1, first subplate 2 and second subplate 3 all include working face 4 and back face 5, working face 4 all is provided with the metal level, 5 edges at the back face of mainboard 1 are provided with slide bar 7, be provided with sliding tray 6 in the slide bar 7, the one end of first subplate 2 and second subplate 3 sets up sliding plate 11, the both sides of sliding plate 11 are provided with loose pulley assembly, loose pulley assembly and 6 sliding connection of sliding tray of slide bar 7, spread groove 13 has been seted up to the lateral wall of mainboard 1, first subplate 2 and second subplate 3 are still provided with joint board 12 on sliding plate 11 along, spread groove 13 can dismantle the technical scheme of being connected with joint board 12. When the clamping mechanism is specifically implemented, the first auxiliary plate 2 and the second auxiliary plate 3 slide in the sliding rod 7 of the main plate 1 through the pulley assemblies on two sides, when the sliding mechanism slides to the edge, further, the sliding groove 6 comprises a first straight groove 8, a second straight groove 9 and a bent groove 10 which are communicated with each other, the hook-shaped sliding groove 6 is formed, the sliding mechanism slides upwards to enter the second straight groove 9 through the bent groove 10, the sliding mechanism pushes back, at the moment, the clamping plate 12 is directly clamped and connected into the connecting groove 13, and stable clamping is achieved. Further, the back 5 is provided with rotatory mounting 21 behind mainboard 1, is fixed in spread groove 13 when above-mentioned joint board 12 joint for behind first subplate 2 or the vice board of second 3 and mainboard 1 fixed connection, rotate out the rotatory mounting 21 that sets up again, make its first subplate 2 or the vice board of second 3 and mainboard 1 further stable, improve the utility model discloses a stability. Meanwhile, due to the fact that the sliding connection is achieved, good storage can be achieved, portability is improved, and the carrying is convenient.

In addition to the above-mentioned relatively good connection stability, the main board 1, the first sub board 2 and the second sub board 3 are also connected with each other in a sliding manner, the sliding groove 6 includes a first straight groove 8, a second straight groove 9 and a curved groove 10 which are communicated with each other, so as to form a hook-type sliding groove 6, after the pulley assembly of the first sub board 2 or the second sub board 3 can slide in the sliding groove 6 of the main board 1, when the pulley assembly slides to the edge of the main board 1 or reaches the curved groove 10, the sliding plate 11, the clamping plate 12 and the whole body move upward, then the sliding plate enters the second straight groove 9, and the reverse pushing is performed, so that the clamping plate 12 is integrally clamped into the connecting groove 13; furthermore, the distance between the upper edge of the connecting groove 13 and the working surface 4 of the main plate 1 is equal to the distance between the clamping plate 12 and the working surface 4 of the first auxiliary plate 2 or the second auxiliary plate 3, and the distance between the lower edge of the connecting groove 13 and the back surface 5 of the main plate 1 is equal to the distance between the clamping plate 12 and the sliding plate 11, so that after the working surfaces 4 of the first auxiliary plate 2 and the second auxiliary plate 3 are connected with the working surface 4 of the main plate 1, the two are connected in a flat manner, the overall connection effect is good, and more use functions can be realized. Simultaneously, all be provided with the metal level at mainboard 1, first subplate 2 and the working face 4 of the vice board 3 of second, can realize inciting somebody to action the utility model discloses regard as exhibition board or show board temporarily, perhaps teaching board utilizes the magnet piece can adsorb file or works on mainboard 1 and first subplate 2 and the vice board 3 of second, and the function is diversified, utilizes connection each other, realizes the variety of usage.

In addition, the utility model does not adopt electric components, complicated mechanical mechanisms and equipment, and can solve the problems that the connection effect is general, the connection is not flat, the direct use cannot be realized, and the structure is not complex while the connection stability is ensured by simple mechanical connection and transformation; the technical scheme can be easily understood and implemented by the technical personnel in the field, and has better market promotion prospect.

To sum up, the embodiment of the utility model provides a board is painted to portable artistic craft hand that expands space, it can be directed against in the not enough of prior art, proposes the solution, and it is better to have stability, and the connection effect is good, and the characteristics that the structure principle is uncomplicated are fit for using widely in this field very much, and the transformation is all not big with the production degree of difficulty, does not have the cost barrier in promoting.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. Portable extension enlarges artistic craft hand drawing board in space, its characterized in that, including mainboard, first subplate and the vice board of second, mainboard, first subplate and the vice board of second all include working face and the back face, the working face all is provided with the metal level, the back face edge of mainboard is provided with the slide bar, is provided with the sliding tray in the slide bar, the one end of first subplate and second subplate sets up the sliding plate, the both sides of sliding plate are provided with loose pulley assembly, loose pulley assembly and the sliding tray sliding connection of slide bar, the spread groove has been seted up to the lateral wall of mainboard, first subplate and the vice board of second are still provided with joint board on the sliding plate along, the spread groove with the joint board can be dismantled and be connected.

2. The portable extendable space-expanding arts and crafts hand drawing board of claim 1 wherein the slide bar includes a vertical plate and a limiting plate, the upper end of the vertical plate is connected with the main board, the lower end of the vertical plate is connected with the limiting plate, and the vertical plate is provided with two sliding grooves.

3. The portable extendable space-expanding artistic hand-drawing board of claim 2, wherein the sliding groove comprises a first straight groove, a second straight groove and a curved groove communicating with each other to form a hook-type sliding groove.

4. The portable extensible space-expanding arts and crafts hand drawing board of claim 3 wherein said pulley assembly includes a roller wheel, a bearing is embedded in said roller wheel, a rotating rod is fixedly connected in said bearing, another end of said rotating rod is connected with said sliding plate, a groove is opened on a wheel wall of said roller wheel, said roller wheel is connected with said sliding groove through said groove.

5. The portable extendable space-expanding artist hand-drawing board as recited in claim 1, wherein the sliding board has a length greater than a length of the engaging board, and the engaging board has a length equal to or less than a depth of the connecting groove.

6. The portable extendable space-expanding artistic hand-drawing board of claim 5, wherein an arc-shaped portion is provided at one end of the engagement plate connected to the connection groove.

7. The portable extendable space-expanding artistic hand-drawing board of claim 1, wherein the distance between the upper edge of the connection groove and the working surface of the main board is equal to the distance between the engagement plate and the working surface of the first sub-board or the second sub-board.

8. The portable extendable space-expanding artistic hand-drawing board of claim 7, wherein a distance between a lower edge of the coupling groove and a rear back surface of the main board is equal to a distance between the catching plate and the sliding plate.

9. The portable extensible space-expanding arts and crafts hand drawing board as claimed in any one of claims 1-8, wherein a middle portion and a rotating fixture for fixing the first or second sub-board stably connected with the main board are arranged at the back of the main board, and the middle portion is provided with a snap-in member for connecting a foldable foot stand.

10. The portable extendable space-expanding hand drawing board for industrial art as claimed in claim 9, wherein the first sub board or the second sub board is provided with a drawing strip, and the main board is provided with a drawing strip.

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