CN107187270B

CN107187270B - Portable drawing board

Info

Publication number: CN107187270B
Application number: CN201610527793.1A
Authority: CN
Inventors: 凌学锋
Original assignee: Huizhou Mingyu Imaging Materials Co ltd
Current assignee: Huizhou Mingyu Imaging Materials Co ltd
Priority date: 2016-07-05
Filing date: 2016-07-05
Publication date: 2020-05-05
Anticipated expiration: 2036-07-05
Also published as: CN107187270A

Abstract

The invention relates to the field of painting tools. The invention aims to provide a portable drawing board which is convenient to fold and use. The technical scheme is as follows: the utility model provides a portable drawing board, includes drawing board support, tray and drawing board, the drawing board support includes fore-stock and after-poppet, the fore-stock comprises two fore-stocks side by side, the after-poppet comprises two after-poppet side by side, the fore-stock is relative with the after-poppet respectively and the upper end is articulated. One of them middle part of fore-stock and after-poppet sets up the articulated shaft and constitutes articulated with one side of tray, and another and one side that the articulated shaft was kept away from to the tray can be dismantled and be connected. The drawing board is positioned between the front supporting rods or between the rear supporting rods and can slide or be fixed along the front supporting rods or the rear supporting rods. The invention can be quickly folded to a smaller volume when not in use, is convenient for a user to store or carry and is very convenient to use.

Description

Portable drawing board

Technical Field

The invention belongs to the field of drawing tools, and particularly relates to a drawing board.

Background

The drawing board is a flat board used for padding drawing paper during drawing, is mostly made of wood, is light and smooth in hand feeling, is sized according to the requirements of users, and can be sold and self-made in art supplies stores with various types of drawing boards. The drawing board can be directly placed on the knee for drawing, but the situation that the drawing board shakes, deflects and the like easily occurs in the mode. Therefore, the drawing board is usually fixed on the drawing board frame during drawing. When the drawing board is fixed, the conventional mode is to fix the drawing board by using a clamp, and the conventional mode is to fix the drawing board by using an adhesive tape. However, when different users use the drawing board, due to factors such as height difference and view angle difference, the height or angle of the drawing board often needs to be adjusted, and if the drawing board is fixed by adopting conventional ways such as clips and tapes, the adjustment is troublesome, time and labor are wasted, and the efficiency of the users is affected.

Therefore, technical solutions that the drawing board and the drawing board frame are integrated into a whole also appear in the prior art, and the height or the angle of the drawing board on the drawing board frame can be roughly adjusted according to the needs of users, but these technical solutions still have many defects: first, the drawing board is when not using, and drawing board support can't be accomodate to less volume, carry very inconveniently. Secondly, the structure is more complicated, and manufacturing cost is higher. Thirdly, the height adjustment range of the drawing board is small, and the drawing board can not be freely adjusted by 360 degrees. Fourthly, the function is single.

Disclosure of Invention

The invention aims to provide a portable drawing board which is convenient to fold and use.

In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows: the utility model provides a portable drawing board, includes drawing board support, tray and drawing board, the drawing board support includes fore-stock and after-poppet, the fore-stock comprises two fore-stocks side by side, the after-poppet comprises two after-poppet side by side, the fore-stock is relative with the after-poppet respectively and the upper end is articulated. One of them middle part of fore-stock and after-poppet sets up the articulated shaft and constitutes articulated with one side of tray, and another and one side that the articulated shaft was kept away from to the tray can be dismantled and be connected. The drawing board is positioned between the front supporting rods or between the rear supporting rods and can slide or be fixed along the front supporting rods or the rear supporting rods.

Preferably, the drawing board is located between two preceding branch, the border of drawing board both sides sets up the sliding tray respectively, the sliding tray extends and is relative with the front branch along the length direction at drawing board both sides border, the upper portion of preceding branch sets up the screw hole towards the sliding tray, threaded hole sets up the locking bolt, the tip of locking bolt is located the sliding tray and offsets with the drawing board.

Preferably, the upper end of the rear supporting rod is provided with a pin hole at the same height as the locking bolt, and a bolt is arranged in the pin hole.

Preferably, the middle part of the front support rod is provided with a first through hole, the front side of the tray is provided with a screw hole and a screw, and the screw passes through the first through hole to lock the front end of the tray and the front support rod; the rear supporting rod is provided with a second through hole, the second through hole is positioned above or below the hinged shaft, and the distance between the second through hole and the hinged shaft is equal to the distance between the screw hole and the hinged shaft.

Preferably, the middle part of the front supporting rod is provided with a first screw hole and a fastening bolt, the edges of the left side and the right side of the tray are provided with a groove along the length direction, and the end part of the fastening bolt is positioned in the groove; the rear supporting rod is provided with a second screw hole, the second screw hole is located above or below the hinged shaft, and the distance between the second screw hole and the hinged shaft is between the two ends of the groove and the distance between the two ends of the groove and the hinged shaft.

Preferably, the articulated shaft includes that both ends set up the round bar of screw thread, the both ends of round bar pass back branch and lock through nut and back branch.

Preferably, the tray comprises a tray body and two connecting arms positioned at the rear side of the tray body, and the tray body is connected with the round rod through the connecting arms.

Preferably, the drawing board comprises two panels, the edges of the two panels are fixed through a frame, the sliding groove is located on the edges of the two sides of the frame, one of the two panels is a fountain pen drawing board, and the other panel is a chalk blackboard.

Preferably, the head of the locking bolt is provided with a plastic screwing head, and the lower ends of the front supporting rod and the rear supporting rod are provided with rubber wear-resistant sleeves.

Preferably, the sliding groove is a closing groove, and the end of the locking bolt is provided with a sliding head matched with the sliding groove.

Preferably, the drawing board frame is made of wood treated by the mildew-proof agent in the following way: drying the wood at 40-50 ℃ for 8-10h, completely soaking the wood in the mildew-proof agent for 12-24h, taking out the wood after soaking is finished, washing the surface with water, drying at 40-50 ℃ for 5h, and finally drying in a natural environment for later use.

The mildew-proof preparation comprises the following components in parts by weight: 0.3 part of di-sec-octyl maleate sodium sulfonate, 8 parts of catechin, 20 parts of glycerol, 20 parts of potassium carbonate, 3 parts of sodium glycocholate, 8 parts of tebuconazole, 4 parts of alcohol, 0.3 part of oleic acid, 450 parts of water, 2 parts of sodium tripolyphosphate and 4 parts of bamboo charcoal powder.

The mildew-proof preparation is prepared by the following steps: a. mixing the di-sec-octyl maleate sodium sulfonate, catechin, tebuconazole, potassium carbonate and water in parts by weight, and stirring until the materials are completely dissolved to obtain a solution; b. adding the rest materials into the solution, and stirring at the rotation speed of 2000-2300 rpm for 40-90 minutes to obtain the mildew-proof preparation.

The invention has the following beneficial effects: can be quickly folded to a smaller volume when not in use, is convenient for a user to store or carry, and is very convenient to use. Specifically, when the drawing board rack is used, the front side of the tray is connected with the middle part of the front supporting rod under a conventional state, and then the drawing board rack is fixed, so that drawing can be performed on the drawing board. After the use is finished, the tray is firstly detached from the front supporting rod, and then the front support and the rear support are folded. Since the rear side of the tray is hinged with the rear support rod, the tray can rotate around the hinged shaft, so that the foldable table is folded to be extremely small in size and very convenient to store and carry. In addition, according to the invention, by optimally selecting the drawing board arranged between the front supporting rods, a user only needs to unscrew the locking bolt, so that the drawing board can be rotated to be adjusted to a proper use angle, and can also push and pull the drawing board to change the position of the locking bolt in the sliding groove, thereby realizing the free adjustment of the height of the drawing board. Therefore, the drawing board height and angle adjusting device can meet different requirements of users on the height and the angle of the drawing board.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of a usage state of the present invention;

FIG. 3 is a schematic view of a second usage state of the present invention;

FIG. 4 is a schematic view of the installation of the locking bolt;

FIG. 5 is a schematic view of a third state of use of the present invention;

FIG. 6 is a schematic view of a fourth state of use of the present invention;

FIG. 7 is a schematic view of a fifth embodiment of the present invention;

FIG. 8 is a schematic view of a sixth mode of use of the present invention;

FIG. 9 is a schematic view of a tray structure;

FIG. 10 is a schematic view of another tray configuration;

fig. 11 is a structural schematic view of the lock bolt.

Detailed Description

A portable drawing board shown in combination with figures 1-10 comprises a drawing board frame, a tray 2 and a drawing board 3, wherein the drawing board frame is used for installing the drawing board 3, and the tray 2 is used for containing drawing tools such as pigments and drawing brushes. The drawing board support comprises fore-stock and after-poppet connection, the fore-stock comprises two fore-stock 4 side by side, the after-poppet comprises two back branch 5 side by side, fore-stock 4 is relative and the upper end is articulated with back branch 5 respectively, and fore-stock 4 is articulated through the hinge with back branch 5 usually. The front and rear are described herein for convenience of description, and are intended to face the user in a normal state, i.e., front and rear on the left side in fig. 1, and rear on the opposite side. One of them middle part of fore-stock and after-poppet sets up articulated shaft 6 and constitutes the articulated with one side of tray 2, and another and tray 2 keep away from one side of articulated shaft 6 and can dismantle the connection. That is, the rear side of the tray 2 may be hinged to the middle portions of the two rear support rods 5 through hinge shafts 6, and the front side of the tray 2 may be detachably connected to the middle portions of the two front support rods 4. Or the front side of the tray 2 is hinged with the middle part of the front supporting rod 4, and the rear side is detachably connected with the middle part of the rear supporting rod 5.

The drawing board 3 is positioned between the front supporting rods 4 or between the rear supporting rods 5 and can slide or be fixed along the front supporting rods 4 or the rear supporting rods 5. For example: the front supporting rod 4 is provided with a guide groove extending along the length direction of the front supporting rod 4, the edges of two sides of the drawing board 3 are provided with convex edges opposite to the guide groove, and the convex edges are positioned in the guide groove. Of course, guide grooves may be formed on the edges of the two sides of the drawing board 3, and ribs may be formed on the front support rods 4. The rear stay 5 may be provided with the above-described rib or guide groove. So that the drawing board 3 can slide along the front support rod 4 or the rear support rod 5. And the drawing board 3 can be fixed by pins or screws when being fixed. For better folding of the palette 3 and tray 2, it is better that the palette 3 is arranged between the rear support rods 5 when the hinge shaft 6 is located on the front support. And the painting board 3 is arranged between the front supporting rods 4 when the hinged shaft 6 is positioned on the rear support.

When the drawing board is used, the front side of the tray 2 is connected with the middle part of the front supporting rod 4 under the conventional state as shown in figure 1, and then the drawing board frame is fixed, so that drawing can be performed on the drawing board 3. When use is complete, the tray 2 is first removed from the front support bar 4, as shown in fig. 2. The front support 4 and the rear support 5 are then collapsed as shown in fig. 3. Because the rear side of tray 2 is articulated with back branch 5, tray 2 can rotate around articulated shaft 6, withdraws between two back branches 5 completely. The sketchpad 3 can also slide along the front supporting rods 4 and be completely retracted between the front supporting rods 4. Thereby the invention is folded to a very small volume and is very convenient to store and carry.

Taking the hinge shaft 6 as an example between the rear support rods 5, in order to further improve the performance of the present invention, as shown in fig. 1 and 4, it is better to locate the drawing board 3 between two front support rods 4, set sliding grooves 7 on the edges of both sides of the drawing board 3, respectively, the sliding grooves 7 extending along the length direction of the edges of both sides of the drawing board 3 and opposite to the front support rods 4, and set threaded holes facing the sliding grooves 7 on the upper portions of the front support rods 4, since the present invention is generally made of wood as a whole, the threaded holes are generally formed by setting through holes on the front support rods 4, and then fixedly setting colloidal particles in the through holes or fixedly setting metal tubes with internal threads in the through holes. Set up locking bolt 8 in the screw hole, locking bolt 8's tip is located sliding tray 7 and offsets with drawing board 3. Thus, as shown in fig. 5-7, a user only needs to unscrew the locking bolt 8, and then can rotate the drawing board 3 to adjust the drawing board 3 to a proper use angle, and also can push and pull the drawing board 3 to change the position of the locking bolt 8 in the sliding groove 7, thereby realizing the free adjustment of the height of the drawing board. After the adjustment is completed, the locking bolt 8 is screwed down to realize the fixation. Therefore, the height and angle of the drawing board 3 can meet different requirements of users.

Further, the sliding groove 7 is a closing groove, and the end of the locking bolt 8 is provided with a sliding head matched with the sliding groove 7. As shown in fig. 4, the space inside the sliding groove 7 is in a shape of a horizontal convex, and the sliding head is a slider located inside the sliding groove 7 and having a size larger than the opening size of the sliding groove 7. Therefore, the drawing board 3 and the locking bolt 8 are limited in the horizontal direction, and the situation that when too many locking bolts 8 are unscrewed, the end parts of the locking bolts 8 are completely separated from the sliding grooves 7, so that the drawing board 3 falls off is avoided; meanwhile, the sliding head increases the friction force between the locking bolt 8 and the sliding groove 7 in the locking state due to the increase of the volume, so that the locking is more reliable.

More preferably, as shown in fig. 8, a pin hole is formed in the upper end of the rear support rod 5 at the same height as the locking bolt 8, and a bolt 9 is arranged in the pin hole. Thus, when the drawing board 3 of the present invention is adjusted to be in a horizontal state, the latch 9 is inserted into the sliding groove 7 and locked, and the present invention can be used as a writing desk, a game desk, a dining table, etc. Of course, other constructions similar to the plug 9 are possible, such as: and another group of locking bolts 8 and threaded holes are arranged at the upper end of the rear supporting rod 5 and at the same height as the locking bolts 8.

When the invention is used, the front side of the tray 2 and the middle parts of the two front supporting rods 4 form detachable connection modes, such as: set up the recess at tray 2's lower surface, set up between two preceding branches 4 with the size and the shape matched with body of rod of recess, rotatory tray 2 accomplishes the connection promptly with the recess block on the body of rod, when needs are dismantled, rotatory tray 2 once more, make the recess and the body of rod separation can. The better way is that the middle part of front branch 4 sets up first through-hole, the front side of tray 2 sets up screw hole and screw 10, screw 10 passes first through-hole and locks tray 2's front end and front branch 4. And a second through hole is formed in the rear supporting rod 5, the second through hole is positioned above or below the hinged shaft 6, and the distance between the second through hole and the hinged shaft 6 is equal to the distance between the screw hole and the hinged shaft 6. That is, the second through hole may be located above the hinge shaft 6 or below the hinge shaft 6, and a distance between the second through hole and the hinge shaft 6 is the same as a distance between the screw hole and the hinge shaft 6 regardless of being located above or below, for example, if the distance between the screw hole and the hinge shaft 6 is 30cm, the distance between the second through hole and the hinge shaft 6 should also be 30 cm. In a conventional state, as shown in fig. 1, a screw 10 is inserted into a screw hole at the front end of the tray 2 through the first through hole to connect the tray 2 and the front bar 4. When the foldable bicycle is required to be folded, the screw 10 is taken down, then the tray 2 is completely rotated to be between the rear support rods 5, and then the screw 10 penetrates through the second through hole to lock the tray 2 and the rear support rods 5.

Or a first screw hole and a fastening bolt are arranged in the middle of the front supporting rod 4, a groove 23 is arranged on the left side edge and the right side edge of the tray 2 along the length direction, and the end part of the fastening bolt is positioned in the groove 23. And a second screw hole is formed in the rear supporting rod 5, the second screw hole is positioned above or below the hinge shaft 6, and the distance between the second screw hole and the hinge shaft 6 is between the two ends of the groove 23 and the distance between the two ends of the groove and the hinge shaft 6. That is, the second screw hole may be located above the hinge shaft 6, and may also be located below the hinge shaft 6. The distance between the second screw hole and the hinge shaft 6 falls between the interval between the front end of the groove 23 and the hinge shaft 6 and the interval between the rear end of the groove 23 and the hinge shaft 6, whether located above or below. For example: the distance between the front end of the groove 23 and the hinge shaft 6 is 30cm, the distance between the rear end of the groove 23 and the hinge shaft 6 is 20cm, the distance between the second screw hole and the hinge shaft 6 is 20cm to 30cm, and 22cm, 23cm and the like can be selected. Thus, in use of the present invention, the position of the end of the fastening bolt in the recess 23 is adjusted by tightening or loosening the fastening bolt. That is to say that the fastening bolt can be closer to the front end of recess 23, also can be closer to the rear end of recess 23 to according to actual conditions more nimble adjustment front support and the angle that opens of after-poppet, the commonality is stronger. Of course, other detachable connections may be used to perform the same function.

The articulated mode of the rear side of tray 2 and rear branch pole 5 is also more, both can articulated shaft 6 is fixed with rear branch pole 5, and tray 2 is rotatory to articulated shaft 6 relatively. It is also possible that said hinge 6 is fixed to the tray 2, the hinge 6 and the tray 2 rotating as a whole with respect to the rear support 5. When the mode that articulated shaft 6 and back branch 5 are fixed is adopted, articulated shaft 6 can be just set up two cylinders in the relative side of

back branch

5, and 2 rear sides of tray set up with cylinder matched with blind hole. Better way is that articulated shaft 6 includes that both ends set up the round bar of screw thread, the both ends of round bar pass back branch 5 and through nut and back branch 5 locking. The structure is simpler, and the processing of the invention is facilitated. On the basis, as shown in fig. 8 and 9, the tray 2 can be optimized to include a tray body 21 and two connecting arms 22 located at the rear side of the tray body 21, and the tray body 21 is connected with the round rod through the connecting arms 22. The round rod between the connecting arms 22 can also be used as a scroll of the drawing paper, so that the user can scroll the drawing paper on the round rod, and the use is very convenient.

Preferably, the drawing board 3 is composed of two panels, the two panels are relatively simple in structure, and in fig. 1, that is, the drawing board 3 is composed of a panel facing to the left side and two panels facing to the right side, that is, the two panels are respectively used as the front and the back of the drawing board 3. As shown in fig. 1 and 4, the edges of the two panels are fixed by the frame, and the sliding grooves 7 are located on the edges of the two sides of the frame, so that the sliding grooves 7 are located on the edges of the frame and can not be arranged on the edges of the drawing board 3 any more, and the drawing board 3 can be thinner and lighter. Preferably, one of the two panels is a fountain pen drawing board, and the other panel is a chalk blackboard. The fountain pen drawing board and the chalk blackboard respectively form the front and the back surfaces of the drawing board 3.

In order to facilitate the user to loosen and tighten the locking bolt 8, a plastic screwing head 81 may be further provided at the head of the locking bolt 8, as shown in fig. 11. The plastic screwing head 81 is made of plastic, is sleeved on the head of the locking bolt 8 and can be in a quincunx shape, a star shape and the like. Of course, other materials for the screw head, such as rubber screw heads, are also possible. The lower ends of the front supporting rod 4 and the rear supporting rod 5 are provided with rubber wear-resistant sleeves 41.

Because the drawing board frame is usually made of wood, the wood is easy to go moldy when being wetted, and the experience of a user is greatly reduced and the service life of the drawing board frame is prolonged. The better way is that the drawing board frame is made of wood treated by mildew-proof preparation, and the mildew-proof preparation comprises the following components in parts by weight: 0.3 part of di-sec-octyl maleate sodium sulfonate, 8 parts of catechin, 20 parts of glycerol, 20 parts of potassium carbonate, 3 parts of sodium glycocholate, 8 parts of tebuconazole, 4 parts of alcohol, 0.3 part of oleic acid, 450 parts of water, 2 parts of sodium tripolyphosphate and 4 parts of bamboo charcoal powder.

The mildew-proof preparation is prepared by the following method:

a. mixing the di-sec-octyl maleate sodium sulfonate, the catechin, the tebuconazole, the potassium carbonate and the water according to the weight parts, and stirring until the materials are completely dissolved to obtain a solution.

b. Adding the rest materials into the solution, and stirring at the rotation speed of 2000-2300 rpm for 40-90 minutes to obtain the mildew-proof preparation.

The obtained mildewcide preparation is taken out and placed in a pool for soaking for standby. Two groups of wood were taken out as experimental and control groups, respectively. Before soaking, the two groups of timbers are baked for 8-10h at the temperature of 40-50 ℃, then the experimental group of timbers are completely soaked in the mildew-proof agent for 12-24h, and the control group of timbers are completely soaked in the treating agent disclosed in the patent document with the application number of 201410258248.8 for 12-24 h. The temperature of the two groups of wood is maintained between 30 and 45 ℃ during the soaking process. After soaking, taking out the two groups of wood, washing the surfaces of the wood with water, drying the wood for 5 hours at the temperature of 40-50 ℃, and finally drying the wood in a natural environment for later use.

And then respectively inoculating trichoderma and black mold on the surfaces of the experimental group wood and the control group wood treated by the steps, and storing for 2 months in an environment with the temperature of 25-35 ℃ and the humidity of 40-50%. After 2 months, the wood is taken out for observation, and the surface of the control group wood is discolored and seriously mildewed. The surfaces of the experimental groups of wood are clean and basically have no hypha. Therefore, the mildew-proof preparation has a better mildew-proof effect, and the service life of the drawing board frame treated by the mildew-proof preparation is greatly prolonged.

Claims

1. The utility model provides a portable drawing board, includes drawing board support, tray (2) and drawing board (3), its characterized in that: the drawing board frame comprises a front support and a rear support, the front support is composed of two front support rods (4) which are arranged side by side, the rear support is composed of two rear support rods (5) which are arranged side by side, and the front support rods (4) are respectively opposite to the rear support rods (5) and the upper ends of the front support rods are hinged; one of the front bracket and the rear bracket is provided with a hinge shaft (6) in the middle to form hinge with one side of the tray (2), and the other bracket is detachably connected with one side of the tray (2) far away from the hinge shaft (6); the drawing board (3) is positioned between the front supporting rods (4) or between the rear supporting rods (5) and can slide or be fixed along the front supporting rods (4) or the rear supporting rods (5); the drawing board (3) is located between the two front supporting rods (4), sliding grooves (7) are formed in the edges of the two sides of the drawing board (3) respectively, the sliding grooves (7) extend along the length direction of the edges of the two sides of the drawing board (3) and are opposite to the front supporting rods (4), threaded holes facing the sliding grooves (7) are formed in the upper portions of the front supporting rods (4), locking bolts (8) are arranged in the threaded holes, and the end portions of the locking bolts (8) are located in the sliding grooves (7) and abut against the drawing board (3); the end part of the locking bolt (8) is provided with a sliding head matched with the sliding groove (7), the space inside the sliding groove (7) is in a horizontal convex shape, and the sliding head is a sliding block which is positioned in the sliding groove (7) and has a size larger than the size of the opening of the sliding groove (7); a pin hole is formed in the upper end of the rear support rod (5) at the same height as the locking bolt (8), and a bolt (9) is arranged in the pin hole; the middle part of the front supporting rod (4) is provided with a first screw hole and a fastening bolt, the edges of the left side and the right side of the tray (2) are provided with grooves (23) along the length direction, and the end parts of the fastening bolts are positioned in the grooves (23); the rear supporting rod (5) is provided with a second screw hole, the second screw hole is located above or below the hinged shaft (6), and the distance between the second screw hole and the hinged shaft (6) is between the two ends of the groove (23) and the distance between the two ends of the groove and the hinged shaft (6).

2. The portable drawing board of claim 1, wherein: a first through hole is formed in the middle of the front supporting rod (4), a screw hole and a screw (10) are formed in the front side of the tray (2), and the screw (10) penetrates through the first through hole to lock the front end of the tray (2) and the front supporting rod (4); set up the second through-hole on back branch (5), the second through-hole is located articulated shaft (6) top or below, and the interval of second through-hole and articulated shaft (6) equals the interval of screw hole and articulated shaft (6).

3. The portable drawing board of claim 1 or 2, wherein: the hinged shaft (6) comprises a round rod with threads at two ends, and two ends of the round rod penetrate through the rear supporting rod (5) and are locked with the rear supporting rod (5) through a nut; tray (2) include disk body (21) and be located two linking arm (22) of disk body (21) rear side, disk body (21) are connected with the round bar through linking arm (22).

4. The portable drawing board of claim 3, wherein: drawing board (3) comprise two panels, the border of two panels passes through the frame fixed, sliding tray (7) are located the border of frame both sides, one of them is the water pen drawing board of two panels, and another is the chalk blackboard.

5. The portable drawing board of claim 4, wherein: the head of locking bolt (8) sets up plastics and revolves twisting head (81), the lower extreme of preceding branch (4) and back branch (5) sets up wear-resisting cover of rubber (41).

6. The portable drawing board of claim 5, wherein: the sliding groove (7) is a closing groove, and the end part of the locking bolt (8) is provided with a sliding head matched with the sliding groove (7).

7. The portable drawing board of claim 3, wherein: the drawing board frame is made of wood treated by the mildew-proof agent, and the treatment mode is as follows: drying the wood at the temperature of 40-50 ℃ for 8-10h, completely soaking the wood in the mildew-proof agent for 12-24h, taking out the wood after soaking is finished, washing the surface of the wood with water, drying the wood at the temperature of 40-50 ℃ for 5h, and finally drying the wood in a natural environment for later use;

the mildew-proof preparation comprises the following components in parts by weight: 0.3 part of di-sec-octyl maleate sodium sulfonate, 8 parts of catechin, 20 parts of glycerol, 20 parts of potassium carbonate, 3 parts of sodium glycocholate, 8 parts of tebuconazole, 4 parts of alcohol, 0.3 part of oleic acid, 450 parts of water, 2 parts of sodium tripolyphosphate and 4 parts of bamboo charcoal powder;