Hidden sitting posture corrector

Abstract

The utility model discloses a hidden sitting posture corrector which comprises a writing board, a mounting seat, a connecting piece and a correcting piece, the mounting seat is arranged on one side of the writing board; the lower end of the connecting piece is slidably mounted on the mounting seat; the correcting piece is slidably arranged at the upper end of the connecting piece; in the unfolded state, at least part of the connecting piece is located above the upper surface of the writing board, and the correcting piece is located above the upper surface of the writing board; in the storage state, the connecting piece is located below the upper surface of the writing board, and at least part of the correcting piece is located below the upper surface of the writing board. By the adoption of the scheme, the installation base, the connecting piece and the correcting piece slide downwards relatively to achieve downward storage of the correcting piece, and when the correcting piece does not need to be used, the correcting piece is prevented from interfering with use of a writing board.

Description

Technical Field

[0001] The utility model belongs to the field of sitting posture correctors, and in particular relates to a hidden sitting posture corrector. Background Art

[0002] The sitting posture corrector is used to correct the user's incorrect sitting posture. Maintaining an abnormal sitting posture for a long time will have a great impact on the body parts such as the cervical spine and lumbar spine. Especially for students, reading, studying and other activities in an incorrect sitting posture for a long time will have an important impact on their growth and development.

[0003] The existing sitting posture corrector can refer to a T-shaped children's sitting posture corrector disclosed in Chinese patent number CN202220873158.X. The chest protector is installed on a fixed table board using a lifting and adjusting mechanism, so that the chest protector can be adjusted up and down by using the lifting and adjusting mechanism.

[0004] The shortcomings of the above-mentioned sitting posture corrector are: the chest protector cannot be adjusted and hidden without removing the chest protector, so that when there is no need to use the chest protector to adjust the sitting posture, the chest protector and the lifting and adjusting mechanism above the fixed table board interfere with the user's operation, such as the hands need to be restricted to the sides of the chest protector and the lifting and adjusting mechanism, and it is impossible to lie on the fixed table board. Utility Model Content

[0005] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a hidden sitting posture corrector which can store the corrective piece downward by relative downward sliding of a mounting seat, a connecting piece and a corrective piece, and prevent the corrective piece from interfering with the use of a writing board when the corrective piece is not in use.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: including: a writing board; a mounting seat, the mounting seat is arranged on one side of the writing board; a connecting member, the lower end of the connecting member is slidably mounted on the mounting seat; a correcting member, the correcting member is arranged at the upper end of the connecting member; the connecting member slides upward relative to the mounting seat, and the correcting member slides upward relative to the connecting member to be unfolded, in the unfolded state, the connecting member is at least partially located above the upper surface of the writing board, and the correcting member is located above the upper surface of the writing board; the connecting member slides downward relative to the mounting seat, and the correcting member slides downward relative to the connecting member to be stored, in the stored state, the connecting member is located below the upper surface of the writing board, and the correcting member is at least partially located below the upper surface of the writing board.

[0007] The utility model is further configured as follows: the connecting member comprises at least two telescopic rod sections that are slidably matched.

[0008] The utility model is further configured as follows: a storage cavity is provided in the mounting seat; in the storage state, the correction piece partially or completely enters the storage cavity.

[0009] The utility model is further configured as follows: the correction piece includes a mounting piece, a chest support and an assembly part connecting the mounting piece and the chest support, and an external notch is provided on the mounting seat; in the storage state, the mounting piece partially or completely enters the storage cavity, the chest support is located outside the mounting seat, and the assembly part is penetrated by the external notch.

[0010] The utility model is further configured as follows: the chest support and the mounting piece are rotationally matched, the assembling portion is arranged at one end of the length of the chest support; in the storage state, the chest support is rotated so that the length direction of the chest support faces.

[0011] The utility model is further configured as follows: a guide sleeve is fixedly provided on the mounting seat, and the connecting piece is inserted into the guide sleeve to realize the sliding fit of the connecting piece on the mounting seat; and / or a sliding plug-in is fixedly provided on the correcting piece, and the sliding plug-in is inserted into the connecting piece to realize the sliding fit of the correcting piece on the mounting seat.

[0012] The utility model is further configured as follows: the guide sleeve is integrally formed on the mounting seat.

[0013] The utility model is further configured as follows: a disassembly opening is provided at the bottom of the guide sleeve, the connecting piece is inserted into the guide sleeve through the disassembly opening, and a closing piece for closing the disassembly opening is detachably provided on the mounting seat.

[0014] The utility model is further configured as follows: the mounting seat and the writing board are integrally formed; or the mounting seat and the writing board are detachably connected.

[0015] The utility model is further configured as follows: an assembly plug-in is provided on one side of the writing board, an assembly socket is provided on the mounting seat, an assembly opening is provided at the lower end of the assembly socket, and the assembly socket is used for the assembly plug-in to be inserted into the assembly socket; a locking member is movably provided on the upper end of the writing board, the locking member moves to the upward movement trajectory of the mounting seat to limit the mounting seat from being removed from the writing board, and the locking member moves out of the upward movement trajectory of the mounting seat to release the restriction on the upward movement of the mounting seat.

[0016] By adopting the above technical scheme, 1. when the corrective device is needed, the sitting posture corrector is unfolded, so that in the unfolded state, the corrective device slides upward relative to the connecting member and the connecting member slides upward relative to the mounting seat to raise the height of the corrective device to a suitable position above the upper surface of the writing board for use; 2. when the corrective device is not needed, the sitting posture corrector is stored, so that in the stored state, the corrective device slides downward relative to the connecting member and the connecting member slides downward relative to the mounting seat to lower the height of the corrective device to near the upper surface of the writing board. At this time, the connecting member is completely located below the upper surface of the writing board, and the corrective device is completely or mostly located below the upper surface of the writing board, so as to achieve the hiding of the connecting member and the corrective device. In the hidden state, the user's operation on the writing board will not be completely or basically interfered with by the connecting member and the corrective device, thereby improving the comfort of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is an assembly diagram of the first embodiment of the utility model;

[0019] Figure 2 It is a cross-sectional view of the first embodiment of the utility model;

[0020] Figure 3 This is a usage state diagram of the first embodiment of the utility model;

[0021] Figure 4 This is a usage state diagram of the first embodiment of the utility model;

[0022] Figure 5 This is an exploded view of the first embodiment of the utility model;

[0023] Figure 6 It is a parts diagram of the mounting member in the first embodiment of the utility model;

[0024] Figure 7 This is a parts diagram of a chest support in Embodiment 1 of the present utility model;

[0025] Figure 8 for Figure 2 A partial enlarged view of

[0026] Fig. 9 This is a parts diagram of the mounting base in the first embodiment of the utility model.

[0027] Label: 1. Writing board;

[0028] 11. Positioning Yanbian; 12. Assembling plug-ins;

[0029] 2. Mounting seat;

[0030] 21. Storage cavity; 22. External notch; 23. Guide sleeve; 24. Closing piece; 25. Assembly socket;

[0031] 231, disassembly opening; 251, assembly opening;

[0032] 3. Connectors;

[0033] 31. Telescopic rod section;

[0034] 4. Correction parts;

[0035] 41. mounting part; 42. chest support; 43. assembly part; 44. sliding plug-in;

[0036] 431, rotating the jack; 432, rotating the plug-in;

[0037] 4311, positioning groove; 4321, positioning convex part; 4322, deformation notch;

[0038] 51. upper limit portion; 52. lower limit portion;

[0039] 61. a limiting hook; 62. a limiting groove; 63. a limiting convex portion;

[0040] 7. Locking piece. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the present invention, and thus to more clearly define the scope of protection claimed by the present invention, the present invention is described in detail below with respect to certain specific embodiments of the present invention. It should be noted that the following are only certain specific implementation methods of the present invention, which are only part of the embodiments of the present invention, wherein the specific and direct description of the relevant structures is only for the convenience of understanding the present invention, and each specific feature does not naturally and directly limit the scope of implementation of the present invention. The conventional selections and substitutions made by those skilled in the art under the guidance of the present invention shall be deemed to be within the scope of protection claimed by the present invention.

[0042] Embodiment 1:

[0043] like Figure 1-Figure 9 As shown, the utility model discloses a hidden sitting posture corrector, comprising:

[0044] The writing board 1 has a positioning edge 11 extending downwards formed integrally on the rear side of the writing board 1, so that the writing board 1 can be placed on a desktop and positioned for use by abutting the positioning edge 11 against the edge of the desktop;

[0045] A mounting seat 2, the mounting seat 2 is fixedly mounted on the positioning edge 11 to achieve assembly on the writing board 1;

[0046] The connecting member 3 is arranged in a vertical direction in its length direction, and the lower end of the connecting member 3 is plugged and matched with the mounting seat 2 to realize the sliding installation of the connecting member 3 on the mounting seat 2;

[0047] The correcting member 4 is installed on the upper end of the connecting member 3 by plugging.

[0048] The connecting member 3 slides upward relative to the mounting seat 2, and the correcting member 4 slides upward relative to the connecting member 3 to be unfolded. In the unfolded state, the connecting member 3 is at least partially located above the upper surface of the writing board 1, and the correcting member 4 is located above the upper surface of the writing board 1;

[0049] The connecting member 3 slides downward relative to the mounting base 2 , and the correcting member 4 slides downward relative to the connecting member 3 for storage. In the stored state, the connecting member 3 is located below the upper surface of the writing board 1 , and the correcting member 4 is at least partially located below the upper surface of the writing board 1 .

[0050] Therefore, 1. when the corrective member 4 is needed, the sitting posture corrector is unfolded so that in the unfolded state, the corrective member 4 slides upward relative to the connecting member 3 and the connecting member 3 slides upward relative to the mounting seat 2 to raise the height of the corrective member 4 to a suitable position above the upper surface of the writing board 1 for use; 2. when the corrective member 4 is not needed, the sitting posture corrector is stored so that in the stored state, the corrective member 4 slides downward relative to the connecting member 3 and the connecting member 3 slides downward relative to the mounting seat 2 to lower the height of the corrective member 4 to near the upper surface of the writing board 1. At this time, the connecting member 3 is completely located below the upper surface of the writing board 1, and the corrective member 4 is completely or mostly located below the upper surface of the writing board 1, so as to achieve the concealment of the connecting member 3 and the corrective member 4. In the hidden state, the user's operation on the writing board 1 will not be completely or basically interfered with by the connecting member 3 and the corrective member 4, thereby improving the comfort of use.

[0051] Preferably, the connecting member 3 includes at least two telescopic rod segments 31 that are slidably matched, and this embodiment specifically uses four telescopic rod segments 31. Therefore, under the cooperation of multiple telescopic rod segments 31, the telescopic rod segments 31 can be stretched to form a longer connecting member 3, and contracted to form a shorter connecting member 3, so that the overall volume is smaller after storage.

[0052] Among them, the mounting seat 2 in this embodiment is provided with a storage cavity 21, and the upper end of the storage cavity 21 is open; in the storage state, the correction piece 4 partially or completely enters the storage cavity 21, and the connecting piece 3 completely enters the storage cavity 21. Therefore, under the effect of the storage cavity 21, the connecting piece 3 and the correction piece 4 can be built-in, which not only plays a protective role, but also has a simpler appearance.

[0053] Preferably, the correction component 4 in the present embodiment includes a mounting component 41, a chest support 42 and an assembly portion 43 connecting the mounting component 41 and the chest support 42; the mounting seat 2 is located at the rear side of the storage cavity 21 and is penetrated by an external notch 22 toward the rear; in the stored state, the mounting component 41 partially or completely enters the storage cavity 21, the chest support 42 is located at the outside of the mounting seat 2, and the assembly portion 43 is penetrated by the external notch 22.

[0054] Therefore, 1. The chest support 42 and the connecting member 3 can be connected by using the mounting member 41 as an intermediate body. After the mounting member 41 is built into the storage cavity 21, the mounting member 41 will be restricted by the peripheral wall of the storage cavity 21, so that when the corrective member 4 is subjected to horizontal thrust, it can be protected by the storage cavity 21 to prevent excessive bending moment from being transmitted to the connecting member 3, thereby protecting the connecting member 3. 2. In order to ensure effective and comfortable force, the chest support 42 usually needs to be set as a large-area structure. Therefore, in the storage state, the large-area chest support 42 is placed outside the outside of the mounting seat 2 so that the shape and size of the mounting seat 2 only need to be adapted to the mounting member 41, and the volume of the mounting seat 2 is smaller. 3. The setting of the external notch allows the assembly part 43 to connect the two horizontally between the mounting member 41 and the chest support 42. After the mounting member 41 enters the storage groove, the assembly part 43 enters the external notch to make the horizontal position of the assembly part 43 lower in the storage state, so that the corrective member 4 can be stored as much as possible below the upper surface of the writing board 1.

[0055] Preferably, the chest support 42 and the mounting member 41 in this embodiment are rotationally matched, and the assembly portion 43 is arranged at one length end of the chest support 42; in the storage state, the chest support 42 is rotated so that the length direction of the chest support 42 faces downward.

[0056] Therefore, for the long chest support 42, the chest support 42 is rotated downward in the storage state to adapt to the length direction of the connecting member 3, so that the overall structure is more compact after storage. When in use, the chest support 42 is rotated to make it horizontal or nearly horizontal for angle adjustment.

[0057] It should be noted that there are two chest supports 42, and they are symmetrically arranged on the mounting member 41, so that when the length of each chest support 42 is turned horizontally, the combination can be used for support, and when the length of each chest support 42 is turned downward, the chest support can be stored more compactly.

[0058] Specifically, the assembly part 43 in the present embodiment includes a rotating socket 431 and a rotating plug-in 432, wherein the rotating socket 431 is opened on the mounting part 41, and the rotating plug-in 432 is integrally formed on the chest support 42, and the rotating plug-in 432 is inserted into the rotating socket 431 and can be rotated; in addition, a plurality of positioning grooves 4311 are circumferentially arranged on the inner circumferential wall of the rotating socket 431, specifically, the number of the positioning grooves 4311 in the present embodiment is 3, namely, the upper end, the lower end and the horizontal end, and correspondingly, a positioning protrusion 4321 is arranged on the outer circumferential wall of the rotating plug-in 432, and the positioning protrusion 4321 and different positioning grooves 4311 are matched to position the chest support 42 at different positions.

[0059] Preferably, the rotating plug-in 432 in this embodiment is cylindrical, and is provided with at least one deformation notch 4322 that penetrates inside and outside, and in this embodiment, there are two deformation notches 4322. Therefore, the deformation notch 4322 provides deformation space in the process of the positioning protrusion 4321 escaping from the positioning groove 4311, so that the escaping is smoother.

[0060] Preferably, the positioning groove 4311 and the positioning protrusion 4321 are both semi-cylindrical, so that a smoother transition can be achieved through arc-shaped cooperation.

[0061] It should be noted that after the rotating plug-in 432 and the rotating socket 431 are plugged in and matched, axial restriction is performed by means of clamping, bolts, etc. to prevent the rotating plug-in 432 from falling out of the rotating socket 431.

[0062] In addition, a guide sleeve 23 is integrally formed on the mounting seat 2 in this embodiment, and the connecting member 3 is inserted into the guide sleeve 23 to achieve the sliding fit of the connecting member 3 on the mounting seat 2; in addition, a sliding plug-in 44 is fixedly provided on the correcting member 4, and the sliding plug-in 44 is inserted into the connecting member 3 to achieve the sliding fit of the correcting member 4 on the mounting seat 2.

[0063] Among them, the sliding plug-in 44 is in the shape of a rod with a vertical length, and a hole is opened at the lower end of the mounting member 41, so that the sliding plug-in 44 can be inserted into the mounting member 41, and fixed installation is completed by interference fit, snap-on connection, etc. In other embodiments, the sliding plug-in and the mounting member 41 are an integrated part.

[0064] It should be noted that the guide sleeve 23, each telescopic rod segment 31, and the sliding plug-in 44 in this embodiment are combined to form a telescopic member, so that the two ends of the telescopic member are respectively fixedly connected to the mounting seat 2 and the correcting member 4 to achieve the lifting and lowering of the correcting member 4.

[0065] Specifically, the inner circumferential wall of the guide sleeve 23, the inner and outer circumferential walls of each telescopic rod segment 31, and the outer circumferential wall of the sliding plug-in 44 are in a runway shape, so that the guide sleeve 23, each telescopic rod segment 31, and the sliding plug-in 44 are plugged in order and can only slide vertically.

[0066] Specifically, the inner circumferential upper end of the guide sleeve 23 and the inner circumferential upper end of each telescopic rod segment 31 are provided with an upper limit portion 51, and correspondingly, the outer circumferential lower end of each telescopic rod and the outer circumferential lower end of the sliding plug-in 44 are provided with a lower limit portion 52, so that each telescopic rod and the sliding plug-in 44 slide upward and reach the upward limit position under the action of the corresponding upper limit portion 51 and the lower limit portion 52, thereby preventing each telescopic rod and the sliding plug-in 44 from sliding upward and falling out.

[0067] Specifically, a limiting hook 61 is provided at the lower end of the outer circumferential wall of each telescopic rod segment 31 and the sliding plug-in 44, a limiting groove 62 is provided at the upper end of the inner circumferential wall of the guide sleeve 23, and a limiting convex portion 63 is provided at the upper end of the inner circumferential wall of each telescopic rod segment 31, so that each telescopic rod segment 31 and the sliding plug-in 44 slide upward and are buckled in the limiting groove 62 or the limiting convex portion 63 by the limiting hook 61 to limit downward.

[0068] In addition, the interior of the guide sleeve 23 and the telescopic rod segment 31 are both vertically penetrated, so that a disassembly opening 231 is formed below the guide sleeve 23. Therefore, the telescopic rod segments 31 with successively smaller cross-sectional areas are successively inserted into the guide sleeve 23 through the disassembly opening 231, and then the sliding plug-in 44 is inserted into the guide sleeve 23 through the disassembly opening 231 to complete the assembly, making the assembly more convenient.

[0069] In addition, a sealing member 24 for sealing the disassembly opening 231 is detachably provided at the lower end of the mounting seat 2, so that the disassembly opening 231 is sealed after assembly to prevent the connector 3 and the sliding plug-in 44 from falling out of the guide sleeve 23 downward.

[0070] Specifically, the closing member 24 is fixedly mounted on the mounting seat 2 by means of bolts.

[0071] An L-shaped assembly plug-in 12 is integrally formed on the positioning edge 11 , an assembly socket 25 is provided on the mounting seat 2 , and an assembly opening 251 is provided at the lower end of the assembly socket 25 .

[0072] Therefore, since the mounting base 2 has a certain height when facing downward, and the adapted table is a structure with a drawer, the mounting base 2 will block the drawer, making it impossible to pull out the drawer. However, the mounting base 2 and the writing board 1 are detachably connected so that when the drawer needs to be opened, the mounting base 2 can be removed from the writing board 1 first, and then the drawer can be opened smoothly. After taking and putting things in the drawer, the mounting base 2 can be reinstalled on the writing board 1. Specifically, when the mounting base 2 needs to be assembled on the writing board 1, the assembly socket 25 is first moved above the assembly plug-in 12 to align the assembly plug-in 12 with the assembly opening 251, and then the mounting base 2 is downward so that the assembly plug-in 12 enters the assembly socket 25, and when in the extreme position, the assembly plug-in 12 is against the upper end of the assembly socket 25 for positioning to complete the plug-in installation.

[0073] In addition, a locking member 7 is provided at the upper end of the writing board 1. When the mounting base 2 and the assembly plug-in 12 are installed, the sliding locking member 7 is used to move above the mounting base 2 to restrict the mounting base 2 from moving upward, thereby ensuring the stability of the assembly of the mounting base 2 and the writing board 1. When the mounting base 2 needs to be disassembled, the sliding locking member 7 releases the restriction on the upward movement of the mounting base 2.

[0074] Preferably, the assembly plug-in 12 and the assembly socket 25 in this embodiment are both two pieces, and are arranged symmetrically on the left and right, so that the stability of the assembly is improved through the cooperation of the two sets of assembly plug-ins 12 and assembly sockets 25.

[0075] Embodiment 2:

[0076] A hidden sitting posture corrector, whose main structure is the same as that of the first embodiment, except that the mounting seat 2 and the writing board 1 are integrally formed.

[0077] Embodiment three:

[0078] A hidden sitting posture corrector, whose main structure is the same as that of the first embodiment, except that the number of chest support 42 is one, and the structure is extended straight or arc-shaped from left to right, and the chest support 42 and the mounting member 41 are fixedly installed so that there is no need to flip the chest support 42.

[0079] Embodiment 4:

[0080] A hidden sitting posture corrector, whose main structure is the same as that of the first embodiment, except that the guide sleeve 23 and the mounting seat 2 are separately arranged, and the guide sleeve 23 is fixedly mounted on the mounting seat 2 by bonding, bolts, clamping, etc.

[0081] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hidden sitting posture corrector, characterized in that: include: Writing board (1); A mounting seat (2), wherein the mounting seat (2) is arranged on one side of the writing board (1); A connecting member (3), the lower end of which is slidably mounted on the mounting seat (2); A correcting member (4), wherein the correcting member (4) is arranged at the upper end of the connecting member (3); The connecting member (3) slides upward relative to the mounting seat (2), and the correcting member (4) slides upward relative to the connecting member (3) to be unfolded. In the unfolded state, the connecting member (3) is at least partially located above the upper surface of the writing board (1), and the correcting member (4) is located above the upper surface of the writing board (1); The connecting member (3) slides downward relative to the mounting seat (2), and the correcting member (4) slides downward relative to the connecting member (3) for storage. In the stored state, the connecting member (3) is located below the upper surface of the writing board (1), and the correcting member (4) is at least partially located below the upper surface of the writing board (1).

2. The hidden sitting posture corrector according to claim 1, characterized in that: The connecting member (3) comprises at least two telescopic rod sections (31) that are slidably matched.

3. The hidden sitting posture corrector according to claim 1, characterized in that: A storage cavity (21) is provided in the mounting seat (2); In the stored state, the correction piece (4) partially or completely enters the storage cavity (21).

4. The hidden sitting posture corrector according to claim 3, characterized in that: The correction piece (4) comprises a mounting piece (41), a chest support (42), and an assembly portion (43) for connecting the mounting piece (41) and the chest support (42), and an external notch (22) is provided on the mounting seat (2); In the storage state, the mounting member (41) partially or completely enters the storage cavity (21), the chest support (42) is located outside the mounting seat (2), and the assembly portion (43) is provided with an external notch (22).

5. The hidden sitting posture corrector according to claim 4, characterized in that: The chest support (42) and the mounting member (41) are rotatably matched, and the assembly portion (43) is arranged at one end of the length of the chest support (42); In the stored state, the chest support (42) is rotated so that the length direction of the chest support (42) faces downward.

6. The hidden sitting posture corrector according to claim 1 or 2, characterized in that: A guide sleeve (23) is fixedly arranged on the mounting seat (2), and the connecting member (3) is inserted into the guide sleeve (23) to achieve a sliding fit of the connecting member (3) on the mounting seat (2); and / or, A sliding plug-in (44) is fixedly provided on the correction piece (4), and the sliding plug-in (44) is inserted into the connecting piece (3) to achieve sliding engagement of the correction piece (4) with the mounting seat (2).

7. The hidden sitting posture corrector according to claim 6, characterized in that: The guide sleeve (23) is integrally formed on the mounting seat (2).

8. The hidden sitting posture corrector according to claim 6, characterized in that: The bottom of the guide sleeve (23) is provided with a disassembly opening (231), the connecting member (3) is inserted into the guide sleeve (23) through the disassembly opening (231), and the mounting seat (2) is detachably provided with a closing member (24) for closing the disassembly opening (231).

9. The hidden sitting posture corrector according to claim 1, characterized in that: The mounting seat (2) and the writing board (1) are integrally formed; or, The mounting seat (2) and the writing board (1) are detachably connected.

10. The hidden sitting posture corrector according to claim 9, characterized in that: An assembly plug-in (12) is provided on one side of the writing board (1), an assembly socket (25) is provided on the mounting seat (2), an assembly opening (251) is provided at the lower end of the assembly socket (25), and the assembly socket (25) is used for the assembly plug-in (12) to be inserted into the assembly socket (25); A locking member (7) is movably provided at the upper end of the writing board (1); the locking member (7) moves to the upward movement trajectory of the mounting seat (2) to restrict the mounting seat (2) from being removed from the writing board (1); and the locking member (7) moves away from the upward movement trajectory of the mounting seat (2) to release the restriction on the upward movement of the mounting seat (2).

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