Adjustable floor type drawing board

Abstract

The utility model relates to the technical field of drawing boards, in particular to an adjustable floor type drawing board which solves the technical problems that when a painter needs to adjust the angle of drawing paper, the drawing paper needs to be frequently disassembled and assembled, and the drawing paper is prone to being damaged. According to the technical scheme, the adjustable floor type drawing board comprises a base, universal wheels, an electric push rod, a horizontal straight board, a drawing board body, a pitch angle adjusting assembly, a clamping assembly, an angle adjusting assembly and a storage assembly; through cooperative work of the pitch angle adjusting assembly, the clamping assembly, the angle adjusting assembly and the storage assembly, the convenient pitch angle adjusting function of the device is provided, a painter is allowed to flexibly adjust the angle of drawing paper, in this way, the tedious operation that the painter frequently disassembles the drawing paper in the drawing process can be effectively avoided, and meanwhile the drawing efficiency is improved. The drawing paper is firmly fixed in the drawing process, the drawing safety is greatly improved, and in addition, a drawing person can easily store and take out needed drawing articles.

Description

Technical Field

[0001] The utility model relates to the technical field of drawing boards, and in particular to an adjustable floor-standing drawing board. Background Art

[0002] The floor-standing drawing board is designed to be stable, which can ensure that it is not easy to shake or tilt during the painting process. At the same time, some floor-standing drawing boards are designed with folding or disassembly functions, which are convenient for storage when not in use. It is also convenient to carry it outdoors or to different places for painting, providing artists and students with a high-quality painting platform. It is an indispensable and important tool in painting creation.

[0003] At present, although most floor-standing drawing boards can provide support for drawing paper and adjust the pitch angle, when painters need to adjust the angle of the drawing paper, they usually have to take the drawing paper off the drawing board first, adjust the position and then fix it back on the drawing board. This operation is not only time-consuming, but also in the frequent disassembly and assembly process, it is easy to cause unnecessary damage to the drawing paper, thereby causing unnecessary trouble.

[0004] Therefore, in view of the above-mentioned situation that when the painter needs to adjust the angle of the drawing paper, the drawing paper needs to be frequently disassembled and assembled, which may easily cause damage to the drawing paper, an adjustable floor-standing drawing board can be designed. Through thread adjustment and belt drive structure, the angle of the drawing paper can be adjusted conveniently while the pitch angle of the drawing board is adjusted, thus avoiding the trouble of repeatedly disassembling and assembling the drawing paper. Utility Model Content

[0005] In order to overcome the problem that when painters need to adjust the angle of the drawing paper, they need to frequently disassemble and assemble, which easily causes damage to the drawing paper.

[0006] The technical solution of the utility model is: an adjustable floor-standing drawing board, comprising a base, universal wheels, an electric push rod, a horizontal straight board, a drawing board, a pitch angle adjustment component, a clamping component, an angle adjustment component, and a storage component; a universal wheel with a built-in self-locking structure is installed at the lower end of the base, an electric push rod for adjusting the height of the drawing board is installed at the upper end of the base, a horizontal straight board supporting the drawing board is installed at the telescopic end of the electric push rod, the drawing board is installed on the upper end of the horizontal straight board through the pitch angle adjustment component, the pitch angle adjustment component with a threaded structure is installed on the upper end of the horizontal straight board, a clamping component with a built-in threaded structure is installed at the front end of the drawing board, an angle adjustment component driven by a belt is installed at the rear end of the drawing board, and a storage component for placing drawing tools is slidably connected in the horizontal straight board.

[0007] Preferably, the universal wheels facilitate the movement of the drawing board, so that it can be easily used in different positions. At the same time, its built-in self-locking structure ensures that the drawing board will not slide when it needs to be fixed in place. The electric push rod is used to adjust the height of the drawing board to adapt to the height of different painters. The pitch angle adjustment component is used to adjust the pitch angle of the drawing board to meet different painting needs. It is precisely adjusted through a threaded structure to ensure stability and accuracy when adjusting the angle. The clamping component is used to fix the drawing paper on the drawing board to prevent sliding or shifting during the painting process. The angle adjustment component adjusts the angle of the turntable through a belt drive so that the angle of the drawing paper can be adjusted, thereby avoiding the trouble of the painter repeatedly disassembling the drawing paper. The storage component is used to place painting tools, such as brushes, paints, etc., for easy access. It is connected to the horizontal straight board by sliding and can be retracted or hidden as needed to save space.

[0008] Preferably, the pitch angle adjustment assembly includes a vertical plate, a knob No. 1, and a fixed block; there are two groups of vertical plates and they are symmetrically installed on the upper end of the horizontal straight plate, a circular hole groove for accommodating the connecting shaft of the knob No. 1 is opened in the vertical plate, there are two groups of No. 1 knobs and they are symmetrically installed in the vertical plate, a limit bolt is installed in the connecting shaft of the knob No. 1, there are two groups of fixed blocks and they are symmetrically installed on the outer wall of the drawing board, a circular protrusion is integrally fixedly connected to the outer wall of the fixed block, an internal thread matching the external thread of the limit bolt is opened in the protrusion, the limit bolt is threadedly connected to the protrusion, the vertical plate is the basic structure of the pitch angle adjustment assembly, which is used to support and fix the drawing board, the circular hole groove opened in the vertical plate allows the knob No. 1 to be rotated inside the vertical plate, and when the pitch angle needs to be adjusted, the limit bolt can be driven to rotate inside the vertical plate by rotating the knob No. 1, thereby separating the connecting shaft from the fixed block.

[0009] Preferably, the clamping assembly includes a turntable, an L-shaped plate, and a threaded rod; a circular mounting groove is provided in the center of the front end of the drawing board, and a turntable for adjusting the angle of the drawing paper is installed in the mounting groove. Four groups of L-shaped plates are installed at the front end of the turntable and are distributed in a circle. The L-shaped plate is provided with an internal thread that matches the external thread of the threaded rod. The threaded rod is threadedly connected to the L-shaped plate. The turntable is used to adjust the angle of the drawing paper. By rotating the turntable, the direction of the drawing paper can be easily adjusted to meet different angle requirements when painting. The L-shaped plate cooperates with the threaded rod to clamp and fix the drawing paper. By adjusting the height of the threaded rod, the drawing paper can be firmly fixed to the drawing board to prevent movement or slipping during the painting process. The threaded rod is made of high-strength and corrosion-resistant materials to ensure its stability and durability.

[0010] Preferably, the clamping assembly also includes a No. 2 knob and a pressure block; the No. 2 knob for adjusting the height of the threaded rod is integrally fixedly connected to the front end of the threaded rod, and the pressure block for fixing the drawing paper is integrally fixedly connected to the rear end of the threaded rod. The No. 2 knob is used to adjust the height of the threaded rod. By rotating the No. 2 knob, the distance between the L-shaped plate and the drawing paper can be conveniently adjusted to adapt to drawing papers of different thicknesses. The surface of the No. 2 knob can adopt an anti-slip design to ensure that it will not slip during rotation. The pressure block is used to fix the drawing paper, so that the drawing paper can remain flat and stable during the painting process. The pressure block is made of a soft and elastic material to ensure that the drawing paper will not be damaged when clamped. At the same time, the design of the pressure block enables it to fit tightly on the drawing paper to prevent movement or slipping during the painting process.

[0011] Preferably, the angle adjustment assembly includes knob No. 3, shaft No. 1, and shaft No. 2; knob No. 3 is installed at the front end of the drawing board and located at the lower end of the turntable, shaft No. 1 is installed at the rear end of knob No. 3, shaft No. 1 passes through the drawing board and extends backward to the rear end of the drawing board, shaft No. 2 is installed at the rear end of the turntable, shaft No. 2 passes through the drawing board and extends backward to the rear end of the drawing board. By rotating knob No. 3, the user can control the rotation angle of the turntable. Shaft No. 1 serves as the main component for transmitting the rotation action, and converts the rotation action of knob No. 3 into the rotation of the driving wheel. Shaft No. 2 is similar to shaft No. 1, but the function of shaft No. 2 is to drive the turntable to rotate, thereby adjusting the angle of the drawing paper.

[0012] Preferably, the angle adjustment assembly also includes a driving wheel, a driven wheel, and a belt; the driving wheel is fixedly connected to the outer wall of the No. 1 rotating shaft, the driven wheel is fixedly connected to the outer wall of the No. 2 rotating shaft, the driving wheel and the driven wheel rotate together and are connected by a belt, the driving wheel and the driven wheel are connected by the belt, the rotation of the driving wheel will drive the driven wheel to rotate, and then realize the rotation of the turntable, the belt drive has the advantages of simple structure, smooth transmission, and is easy to install and maintain. At the same time, the belt is made of a material with a certain elasticity.

[0013] Preferably, the storage assembly includes a storage slot, a storage box, a slide groove, and a convex rail; a storage slot is provided at the front end of the horizontal straight plate, slide grooves are provided on the inner walls on the left and right sides of the storage slot, and the outer walls on the left and right sides of the storage box are integrally fixedly connected with convex rails that are compatible with the slide grooves. The storage box is slidably connected to the slide groove through the convex rails. The storage box serves as a storage container for painting items and can hold various painting items. At the same time, the convex rail cooperates with the slide groove to enable the storage box to slide in the slide groove, making it convenient for users to take and put painting items.

[0014] Beneficial effects of the utility model:

[0015] 1. When the pitch angle adjustment component, the clamping component, the angle adjustment component and the storage component work together, it not only provides a convenient pitch angle adjustment function for the device, but also allows the painter to flexibly adjust the angle of the drawing paper, which can effectively avoid the tedious operation of the painter frequently removing the drawing paper during the painting process, meet the diverse painting needs, and significantly improve the flexibility and adaptability of the device. At the same time, the drawing paper is firmly fixed during the painting process, which greatly improves the safety of painting. In addition, the painter can easily store and take out the required painting items;

[0016] 2. The driving wheel and the driven wheel are connected by a belt. The rotation of the driving wheel will drive the driven wheel to rotate, thereby realizing the rotation of the turntable. The belt drive has the advantages of simple structure, smooth transmission, and easy installation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 What is shown is a schematic diagram of the three-dimensional structure of the adjustable floor-standing drawing board of the utility model;

[0018] Figure 2 Shown is a front view schematic diagram of an adjustable floor-standing drawing board of the utility model;

[0019] Figure 3 Shown is a schematic diagram of the three-dimensional structure of the adjustable pitch angle adjustment component of the floor-standing drawing board of the utility model;

[0020] Figure 4 Shown is a schematic diagram of the three-dimensional structure of the adjustable floor-standing drawing board clamping assembly of the utility model;

[0021] Figure 5 Shown is a schematic diagram of the three-dimensional structure of the adjustable angle adjustment component of the floor-standing drawing board of the utility model;

[0022] Figure 6 Shown is a schematic diagram of the three-dimensional structure of the adjustable floor-standing drawing board storage component of the present invention.

[0023] Explanation of the reference numerals in the accompanying drawings: 1. base; 2. universal wheel; 3. electric push rod; 4. horizontal straight board; 5. drawing board; 601. vertical board; 602. knob No. 1; 603. fixed block; 701. turntable; 702. L-shaped board; 703. threaded rod; 704. knob No. 2; 705. pressure block; 801. knob No. 3; 802. shaft No. 1; 803. shaft No. 2; 804. driving wheel; 805. driven wheel; 806. belt; 901. storage slot; 902. storage box; 903. slide slot; 904. convex rail. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0025] See also Figure 1-2 The utility model provides an embodiment: an adjustable floor-standing drawing board 5, comprising a base 1, universal wheels 2, electric push rods 3, horizontal straight boards 4, drawing board 5, a pitch angle adjustment component, a clamping component, an angle adjustment component, and a storage component; a universal wheel 2 with a built-in self-locking structure is installed at the lower end of the base 1, an electric push rod 3 for adjusting the height of the drawing board 5 is installed at the upper end of the base 1, a horizontal straight board 4 supporting the drawing board 5 is installed at the telescopic end of the electric push rod 3, the drawing board 5 is installed on the upper end of the horizontal straight board 4 through the pitch angle adjustment component, a pitch angle adjustment component with a threaded structure is installed on the upper end of the horizontal straight board 4, a clamping component with a built-in threaded structure is installed at the front end of the drawing board 5, an angle adjustment component driven by a belt 806 is installed at the rear end of the drawing board 5, a storage component for placing painting tools is slidably connected to the horizontal straight board 4, and the universal wheel 2 is easy to move The drawing board 5 can be easily used in different positions. At the same time, its built-in self-locking structure ensures that the drawing board 5 will not slide when it needs to be fixed in place. The electric push rod 3 is used to adjust the height of the drawing board 5 to adapt to the height of different painters. The pitch angle adjustment component is used to adjust the pitch angle of the drawing board 5 to meet different painting needs. It is precisely adjusted through a threaded structure to ensure stability and accuracy when adjusting the angle. The clamping component is used to fix the drawing paper on the drawing board 5 to prevent it from sliding or shifting during the painting process. The angle adjustment component drives the angle of the adjustment dial 701 through the belt 806, so that the angle of the drawing paper can be adjusted, thereby avoiding the trouble of the painter repeatedly disassembling the drawing paper. The storage component is used to place painting tools, such as brushes, paints, etc., for easy access. It is connected to the horizontal straight board 4 by sliding, and can be retracted or hidden as needed to save space.

[0026] See also Figure 3-4In this embodiment, the pitch angle adjustment component includes a vertical plate 601, a number one knob 602, and a fixed block 603; the vertical plates 601 have two groups and are symmetrically installed on the upper end of the horizontal straight plate 4, and a circular hole groove for accommodating the connecting shaft of the number one knob 602 is opened in the vertical plate 601, and the number one knob 602 has two groups and is symmetrically installed in the vertical plate 601, and the limit bolt is installed in the connecting shaft of the number one knob 602, and the fixed block 603 has two groups and is symmetrically installed on the outer wall of the drawing board 5, and the outer wall of the fixed block 603 is integrally fixedly connected with a circular protrusion, and the protrusion is provided with an internal thread that matches the external thread of the limit bolt, and the limit bolt is threadedly connected to the protrusion, and the vertical plate 601 is the basic structure of the pitch angle adjustment component, Used to support and fix the drawing board 5, the circular hole groove opened inside the vertical plate 601 allows the No. 1 knob 602 to rotate inside the vertical plate 601. When the pitch angle needs to be adjusted, by rotating the No. 1 knob 602, the limit bolt can be driven to rotate inside the vertical plate 601, thereby separating the connecting shaft from the fixed block 603. The clamping assembly includes a turntable 701, an L-shaped plate 702, and a threaded rod 703; a circular mounting groove is opened at the center of the front end of the drawing board 5, and the turntable 701 for adjusting the angle of the drawing paper is installed in the mounting groove. Four groups of L-shaped plates 702 are installed at the front end of the turntable 701 and are distributed in a circle L. The plate 702 is provided with an internal thread screw that matches the external thread of the threaded rod 703. The threaded rod 703 The threaded rod 703 is connected to the L-shaped plate 702, and the clamping assembly also includes a second knob 704 and a pressure block 705; the second knob 704 for adjusting the height of the threaded rod 703 is integrally fixedly connected to the front end of the threaded rod 703, and the pressure block 705 for fixing the drawing paper is integrally fixedly connected to the rear end of the threaded rod 703. The turntable 701 is used to adjust the angle of the drawing paper. By rotating the turntable 701, the direction of the drawing paper can be easily adjusted to meet different angle requirements when drawing. The L-shaped plate 702 cooperates with the threaded rod 703 to clamp and fix the drawing paper. By adjusting the height of the threaded rod 703, it can be ensured that the drawing paper is firmly fixed on the drawing board 5 to prevent it from moving or slipping during the drawing process. The threaded rod 703 adopts a high The second knob 704 is used to adjust the height of the threaded rod 703. By rotating the second knob 704, the distance between the L-shaped plate 702 and the drawing paper can be easily adjusted to adapt to drawing papers of different thicknesses. The surface of the second knob 704 can adopt an anti-slip design to ensure that it will not slip during rotation. The pressure block 705 is used to fix the drawing paper, so that the drawing paper can be kept flat and stable during the painting process. The pressure block 705 is made of a soft and elastic material to ensure that the drawing paper will not be damaged when clamped. At the same time, the design of the pressure block 705 enables it to fit tightly on the drawing paper to prevent movement or slipping during the painting process.

[0027] See also Figure 5-6In this embodiment, the angle adjustment component includes a third knob 801, a first shaft 802, and a second shaft 803; the third knob 801 is installed at the front end of the drawing board 5 and is located at the lower end of the turntable 701, the rear end of the third knob 801 is installed with a first shaft 802, the first shaft 802 passes through the drawing board 5 and extends backward to the rear end of the drawing board 5, the second shaft 803 is installed at the rear end of the turntable 701, the second shaft 803 passes through the drawing board 5 and extends backward to the rear end of the drawing board 5, and the angle adjustment component also includes a driving wheel 804, a driven wheel 80 5. Belt 806; the driving wheel 804 is fixedly connected to the outer wall of the No. 1 rotating shaft 802, and the driven wheel 805 is fixedly connected to the outer wall of the No. 2 rotating shaft 803. The driving wheel 804 and the driven wheel 805 rotate together and are connected with the belt 806. By rotating the No. 3 knob 801, the user can control the rotation angle of the turntable 701. The No. 1 rotating shaft 802 is the main component for transmitting the rotation action, and the rotation action of the No. 3 knob 801 is converted into the rotation of the driving wheel 804. The No. 2 rotating shaft 803 is similar to the No. 1 rotating shaft 802, but the No. 2 rotating shaft 803 is The function of the rotating shaft 803 is to drive the turntable 701 to rotate, so as to adjust the angle of the drawing paper. The driving wheel 804 and the driven wheel 805 are connected by a belt 806. The rotation of the driving wheel 804 will drive the driven wheel 805 to rotate, thereby realizing the rotation of the turntable 701. The belt 806 transmission has the advantages of simple structure and stable transmission, and is easy to install and maintain. At the same time, the belt 806 is made of a material with a certain elasticity. The storage assembly includes a storage slot 901, a storage box 902, a slide slot 903, and a convex rail 904; horizontal A storage slot 901 is provided at the front end of the straight plate 4, and slide slots 903 are provided on the inner walls on the left and right sides of the storage slot 901. The outer walls on the left and right sides of the storage box 902 are integrally fixedly connected with convex rails 904 that are compatible with the slide slots 903. The storage box 902 is slidably connected to the slide slots 903 through the convex rails 904. The storage box 902 serves as a storage container for painting objects and can place various painting objects. At the same time, the convex rails 904 cooperate with the slide slots 903 to enable the storage box 902 to slide in the slide slots 903, which is convenient for users to take and put painting objects.

[0028] At the beginning of the painting work, the painter first uses the universal wheel 2 to easily move the drawing board 5 to the predetermined working area, and then operates the electric push rod 3 to accurately adjust the height of the drawing board 5 to meet personal working habits and needs. Next, the drawing board 5 can be separated from the vertical board 601 by rotating the first knob 602, which provides convenience for adjusting the pitch angle of the drawing board 5;

[0029] Next, lay the drawing paper flat on the turntable 701, and then rotate the second knob 704, which will drive the threaded rod 703 and the pressing block 705 to descend until the pressing block 705 firmly fixes the drawing paper on the turntable 701, ensuring the stability of the drawing paper during the painting process;

[0030] In order to meet different painting angle requirements, the No. 3 knob 801 can be rotated. The rotation of the No. 3 knob 801 will drive the driving wheel 804 to rotate. Through the transmission action of the belt 806, the driven wheel 805 and the No. 2 shaft 803 will also rotate accordingly, thereby driving the turntable 701 to rotate, and the angle of the drawing paper can be easily adjusted. After the painting work is completed, the storage box 902 can be easily pulled out and the used painting tools can be neatly placed in the storage box 902, which not only facilitates the organization of items, but also ensures the cleanliness and orderliness of the work area.

[0031] Through the above steps, when the pitch angle adjustment component, the clamping component, the angle adjustment component and the storage component work together, it not only provides a convenient pitch angle adjustment function for the device, but also allows the painter to flexibly adjust the angle of the drawing paper, which can effectively avoid the tedious operation of the painter frequently disassembling the drawing paper during the painting process, meet the diverse painting needs, and significantly improve the flexibility and adaptability of the device. At the same time, the drawing paper is firmly fixed during the painting process, which greatly improves the safety of painting. In addition, the painter can easily store and take out the required painting items, which solves the problem of frequent disassembly and assembly when the painter needs to adjust the angle of the drawing paper, which easily causes damage to the drawing paper.

[0032] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the purpose of the present invention.

Claims

1. An adjustable floor-standing drawing board, comprising a base (1), universal wheels (2), an electric push rod (3), a horizontal straight board (4), and a drawing board (5); characterized in that: The invention also comprises a pitch angle adjustment component, a clamping component, an angle adjustment component and a storage component; a universal wheel (2) with a built-in self-locking structure is installed at the lower end of the base (1); an electric push rod (3) for adjusting the height of the drawing board (5) is installed at the upper end of the base (1); a horizontal straight board (4) supporting the drawing board (5) is installed at the telescopic end of the electric push rod (3); the drawing board (5) is installed on the upper end of the horizontal straight board (4) through the pitch angle adjustment component; a pitch angle adjustment component with a threaded structure is installed on the upper end of the horizontal straight board (4); a clamping component with a built-in threaded structure is installed at the front end of the drawing board (5); an angle adjustment component driven by a belt (806) is installed at the rear end of the drawing board (5); and a storage component for placing painting tools is slidably connected in the horizontal straight board (4).

2. The adjustable floor-standing drawing board according to claim 1, characterized in that: The pitch angle adjustment assembly comprises a vertical plate (601), a first knob (602), and a fixed block (603); the vertical plates (601) are provided in two groups and are symmetrically installed on the upper end of the horizontal straight plate (4); a circular hole groove for accommodating the connecting shaft of the first knob (602) is provided in the vertical plate (601); the first knob (602) is provided in two groups and is symmetrically installed in the vertical plate (601); a limit bolt is installed in the connecting shaft of the first knob (602); the fixed block (603) is provided in two groups and is symmetrically installed on the outer wall of the drawing board (5); a circular protrusion is integrally fixedly connected to the outer wall of the fixed block (603); an internal thread matching the external thread of the limit bolt is provided in the protrusion; the limit bolt is threadedly connected in the protrusion.

3. The adjustable floor-standing drawing board according to claim 1, characterized in that: The clamping assembly comprises a rotating disk (701), an L-shaped plate (702), and a threaded rod (703); a circular mounting groove is provided at the center of the front end of the drawing board (5), and the rotating disk (701) for adjusting the angle of the drawing paper is installed in the mounting groove; four groups of L-shaped plates (702) are installed at the front end of the rotating disk (701) and are distributed in a circumference; an internal thread matching the external thread of the threaded rod (703) is provided in the L-shaped plate (702), and the threaded rod (703) is threadedly connected in the L-shaped plate (702).

4. The adjustable floor-standing drawing board according to claim 3, characterized in that: The clamping assembly further comprises a second knob (704) and a pressing block (705); the second knob (704) for adjusting the height of the threaded rod (703) is integrally fixedly connected to the front end of the threaded rod (703), and the pressing block (705) for fixing the drawing paper is integrally fixedly connected to the rear end of the threaded rod (703).

5. The adjustable floor-standing drawing board according to claim 3, characterized in that: The angle adjustment component comprises a third knob (801), a first rotating shaft (802), and a second rotating shaft (803); the third knob (801) is mounted at the front end of the drawing board (5) and is located at the lower end of the rotating disk (701); the first rotating shaft (802) is mounted at the rear end of the third knob (801); the first rotating shaft (802) passes through the drawing board (5) and extends backward to the rear end of the drawing board (5); the second rotating shaft (803) is mounted at the rear end of the rotating disk (701); the second rotating shaft (803) passes through the drawing board (5) and extends backward to the rear end of the drawing board (5).

6. The adjustable floor-standing drawing board according to claim 5, characterized in that: The angle adjustment assembly further comprises a driving wheel (804), a driven wheel (805), and a belt (806); the driving wheel (804) is fixedly connected to the outer wall of the first rotating shaft (802), the driven wheel (805) is fixedly connected to the outer wall of the second rotating shaft (803), and the driving wheel (804) and the driven wheel (805) are connected to the belt (806) for rotating together.

7. The adjustable floor-standing drawing board according to claim 1, characterized in that: The storage assembly comprises a storage groove (901), a storage box (902), a slide groove (903), and a convex rail (904); the front end of the horizontal straight plate (4) is provided with a storage groove (901), the inner walls on the left and right sides of the storage groove (901) are provided with slide grooves (903), the outer walls on the left and right sides of the storage box (902) are integrally fixedly connected with convex rails (904) adapted to the slide groove (903), and the storage box (902) is slidably connected to the slide groove (903) via the convex rails (904).

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