CN112369817A

CN112369817A - Desk with myopia prevention function

Info

Publication number: CN112369817A
Application number: CN202011271444.0A
Authority: CN
Inventors: 马建林
Original assignee: Jiangxi Wanyou Industrial Co ltd
Current assignee: Jiangxi Wanyou Industrial Co ltd
Priority date: 2020-11-13
Filing date: 2020-11-13
Publication date: 2021-02-19
Anticipated expiration: 2040-11-13
Also published as: CN112369817B

Abstract

The invention relates to a desk, in particular to a desk with a myopia prevention function. The invention provides a desk which is anti-myopia and comfortable and has an anti-myopia function. A desk with a myopia prevention function comprises a lifting support plate and a connecting frame, wherein the connecting frame is arranged on the lifting support plate; the drawer is arranged in the connecting frame in a sliding manner; the connecting frame is provided with a lifting rotating mechanism; the automatic lifting rotating mechanism is arranged on the connecting frame and matched with the lifting rotating mechanism. Through the design of the lifting rotating mechanism and the automatic lifting rotating mechanism, the head of people is not required to be lowered when reading, people can read books more easily, the neck of people cannot be sore, through the design of the clamping mechanism and the clamping mechanism, people can read books without manually fixing books and a desktop, and the comfort of people when reading books is further improved.

Description

Desk with myopia prevention function

Technical Field

The invention relates to a desk, in particular to a desk with a myopia prevention function.

Background

The desk is used by students, starts from eight tables in the earliest school hall, and is commonly called as a desk for schools and school learning.

At present, when a student reads a book on a school desk, the student needs to lower the head to read the book, and the student looks at the book end and needs to manually fix the book, so that people are tired when reading the book, and the student lies prone on the desk to read the book easily in the reading process, and though the student is comfortable, the student easily causes myopia and humpback, thereby influencing the life of people.

In the prior art, patent with application number CN108991753A discloses a myopia-preventing desk, which comprises a desk main body, desk legs and a myopia-preventing component; the desk legs are arranged at the bottom of the desk main body, and the myopia prevention component is arranged at the bottom of the desk main body. The myopia prevention assembly comprises a first slide way, a first sliding plate, a hinge, a second sliding plate, a second slide way, a cross beam, a double-end connecting piece and an adjustable stop block; the first slide rails are fixed at the bottom of the desk main body, the first sliding plate is connected with the first slide rails and can slide in the two first slide rails, the first sliding plate and the second sliding plate are connected through hinges, and the second sliding plate is connected with the two second slide rails and can slide relatively; the second slideway can slide in the first slideway; the cross beam is fixed at the lower ends of the two second slide ways; the upper end of the double-end connecting piece is connected with the cross beam, and the lower end of the double-end connecting piece is connected with the adjustable stop block; but can not automatically clamp the book and adjust the reading angle.

Aiming at the problems, a desk which can adjust the angle of a desktop, automatically clamp books and prevent people from being short-sighted and has a function of preventing short sight is designed.

Disclosure of Invention

In order to overcome the defects that people are easy to cause myopia and are uncomfortable when using an old desk, the technical problem of the invention is as follows: provides a desk which can prevent myopia and is more comfortable and has the function of preventing myopia.

The technical scheme is as follows: a desk with myopia prevention function comprises:

the lifting support plate is provided with a connecting frame;

the drawer is arranged in the connecting frame in a sliding manner;

the connecting frame is provided with a lifting rotating mechanism;

the automatic lifting rotating mechanism is arranged on the connecting frame and matched with the lifting rotating mechanism.

Further, it is particularly preferable that the lifting and lowering rotation mechanism includes:

two lifting connecting rods are arranged in the connecting frame;

the lifting connecting rod is provided with a rotatable desktop;

the first rotating shaft is rotatably arranged on the rotatable desktop and is provided with two first rotating shafts.

Further, it is particularly preferable that the automatic lifting rotation mechanism includes:

the connecting frame is provided with two first fixed sliding sleeve plates;

the connecting and driving lifting plates are arranged in the first fixed sliding sleeve plate in a sliding mode, the connecting and driving lifting plates are connected with the movable lifting plates and the drawer, and the movable lifting plates are connected with the rotatable tabletop in a matching mode;

the outer sides of the first rotating shafts are provided with one-way gears;

the first torsion spring is wound on the outer side of the first rotating shaft and connected with the one-way gear;

and the first racks are connected with the movable lifting plate and are matched with the one-way gear.

Further, it is particularly preferable that the clamping device further includes a clamping mechanism including:

the rotatable desktop is provided with two sliding fixing sleeves;

the sliding clamping plate is arranged on the sliding fixing sleeve in a sliding manner;

the reset spring is wound on the sliding clamping plate and connected with the sliding fixing sleeve.

In addition, it is particularly preferable that the device further comprises a locking mechanism, and the locking mechanism comprises:

the outer sides of the sliding clamping plates are provided with the blocking rods;

the rotatable desktop is rotatably provided with two rotating connecting rods;

the rotatable baffles are arranged on the rotating connecting rods and matched with the straight gears;

and the second torsion spring is wound on the rotatable baffle and is connected with the rotating connecting rod.

Further, it is particularly preferable that the apparatus further comprises a retaining mechanism including:

the connecting frame is provided with two rotary connecting plates;

the second rotating shaft is rotatably arranged in the rotating connecting plate;

and the middle part of the second rotating shaft is provided with a rotating positioning plate.

In addition, it is particularly preferable that the automatic lifting and rotating return mechanism further includes:

two second fixed sliding sleeve plates are arranged on the connecting frame;

the second fixed sliding sleeve plate is internally connected with a wedge-shaped driving block in a sliding manner, and the wedge-shaped driving block is matched with the sliding clamping plate;

the second rotating shaft is provided with two straight gears;

and two second racks are arranged on the drawer and are meshed with the straight gear.

In addition, it is particularly preferable that the lifting support plate is made of iron.

Compared with the prior art, the invention has the following advantages:

1. through the design of the lifting rotating mechanism and the automatic lifting rotating mechanism, people do not need to lower heads when reading, people can read books more easily, the neck cannot be sore, and the comfort of people is improved when reading books.

2. Through the design of the clamping mechanism and the clamping mechanism, the book and the desktop do not need to be manually fixed when people read books, and the comfort of people when reading books is further improved.

3. Through the design of the automatic lifting and rotating reset mechanism, the desk is automatically restored to the initial state, people do not need to manually reset the desk, and people can read books conveniently when using the desk.

Drawings

Fig. 1 is a schematic perspective view of the present invention.

Fig. 2 is a schematic perspective view of the lifting and rotating mechanism, the connecting frame, the drawer and the like of the present invention.

Fig. 3 is a schematic perspective view of the automatic lifting and rotating mechanism and the drawer according to the present invention.

Fig. 4 is a schematic perspective view of the clamping mechanism and the drawer according to the present invention.

Fig. 5 is a schematic perspective view of the locking mechanism and the drawer box one-way gear of the present invention.

Fig. 6 is a schematic perspective view of the blocking mechanism, the drawer and the connecting frame according to the present invention.

Fig. 7 is a schematic perspective view of the automatic lifting rotary reset mechanism, the drawer and the connecting frame according to the present invention.

Wherein the figures include the following reference numerals: 1. the lifting and lowering device comprises a lifting and lowering support plate, 2, a connecting frame, 3, a drawer, 4, a lifting and lowering rotating mechanism, 41, a lifting and lowering connecting rod, 42, a first rotating shaft, 43, a rotatable desktop, 5, an automatic lifting and rotating mechanism, 51, a first fixed sliding sleeve plate, 52, a connecting movable lifting plate, 53, a one-way gear, 54, a first torsion spring, 55, a first rack, 6, a clamping mechanism, 61, a sliding fixed sleeve, 62, a sliding clamping plate, 63, a return spring, 7, a clamping mechanism, 71, a blocking rod, 72, a rotating connecting rod, 73, a rotatable baffle, 74, a second torsion spring, 8, a blocking mechanism, 81, a rotating connecting plate, 82, a second rotating shaft, 83, a rotating positioning plate, 9, an automatic lifting and rotating return mechanism, 91, a second fixed sliding sleeve plate, 92, a wedge-shaped driving block, 93, a straight gear, 94 and a second rack.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

Example 1

A desk with a myopia prevention function is shown in figures 1, 2, 3, 4, 5, 6 and 7 and comprises a lifting support plate 1, a connecting frame 2, a drawer 3, a lifting rotating mechanism 4 and an automatic lifting rotating mechanism 5, wherein the connecting frame 2 is arranged on the lifting support plate 1, the drawer 3 is arranged on the connecting frame 2 in a sliding mode, the lifting rotating mechanism 4 is arranged on the upper side of the connecting frame 2, the automatic lifting rotating mechanism 5 is arranged on the left side and the right side of the connecting frame 2, and the automatic lifting rotating mechanism 5 is matched with the lifting rotating mechanism 4.

When people are ready to read books, the drawer 3 is opened firstly, the drawer 3 drives the automatic lifting rotating mechanism 5 to operate, the automatic lifting rotating mechanism 5 drives the lifting rotating mechanism 4 to operate, at the moment, people put books into the lifting rotating mechanism 4, so that people can read the books easily, the eyesight is not affected, after people read the books, the books are taken out from the lifting rotating mechanism 4 and put into the drawer 3, the drawer 3 is pushed back to the connecting frame 2, the automatic lifting rotating mechanism 5 is restored to the initial position at the moment, the lifting rotating mechanism 4 is restored to the initial position, if people read the books again, the operation is repeated.

Example 2

Based on embodiment 1, as shown in fig. 1, 2, 3 and 5, the lifting and rotating mechanism 4 includes a lifting and lowering connecting rod 41, a first rotating shaft 42 and a rotatable table surface 43, the lifting and lowering connecting rod 41 is disposed at the middle of the left and right sides in the connecting frame 2, the rotatable table surface 43 is disposed on the upper side of the lifting and lowering connecting rod 41, and two first rotating shafts 42 are rotatably disposed on the lower side of the rotatable table surface 43.

When people are ready to read books, the drawer 3 is firstly opened, the drawer 3 drives the automatic lifting rotating mechanism 5 to operate, the automatic lifting rotating mechanism 5 drives the rotatable table top 43 to move upwards, the rotatable table top 43 drives the lifting connecting rod 41 to move upwards, the lifting connecting rod 41 drives the first rotating shaft 42 to move upwards, the automatic lifting rotating mechanism 5 drives the rotatable table top 43 to rotate to a proper angle, the rotatable table top 43 drives the first rotating shaft 42 to rotate, people put books from the drawer 3 onto the rotatable table top 43 and manually clamp the rotatable table top 43 to prevent the rotatable table top 43 from rotating, after people finish reading the books, the books are put into the drawer 3 and the drawer 3 is pushed back to an initial position, the automatic lifting rotating mechanism 5 is restored to the initial position, the rotatable table top 43 is restored to the initial position, the lifting connecting rod 41 is restored to the initial position, and if people read the book again, repeating the operation.

The automatic lifting and rotating mechanism 5 comprises a first fixed sliding sleeve plate 51, a connecting movable lifting plate 52, a one-way gear 53, a first torsion spring 54 and a first rack 55, the first fixed sliding sleeve plate 51 is arranged at the front part of the left side and the right side of the connecting frame 2, the connecting and driving lifting plate 52 is arranged in each first fixed sliding sleeve plate 51 in a sliding manner, the front side of the connecting movable lifting plate 52 is connected with the drawer 3, the connecting and driving lifting plate 52 is matched with the rotatable tabletop 43, the one-way gear 53 is arranged on the outer side of each first rotating shaft 42, the first torsion spring 54 is wound on the outer side of each first rotating shaft 42, the first torsion spring 54 is connected with the one-way gear 53, the first rack 55 is arranged on the rear side of the upper part of the connecting movable lifting plate 52, and the first rack 55 is matched with the one-.

When people are ready to read books, the drawer 3 is firstly opened, the drawer 3 drives the connecting and driving lifting plate 52 to move forward, the connecting and driving lifting plate 52 drives the rotatable tabletop 43 to move upward, the connecting and driving lifting plate 52 drives the first rack 55 to move forward, the rotatable tabletop 43 drives the lifting connecting rod 41 to move upward, the lifting connecting rod 41 drives the first rotating shaft 42 to move upward, the first rotating shaft 42 drives the one-way gear 53 to move upward, when the first rack 55 is meshed with the one-way gear 53, the first rack 55 drives the one-way gear 53 to rotate, the first torsion spring 54 is stretched at the moment, the one-way gear 53 drives the first rotating shaft 42 to rotate, the first rotating shaft 42 drives the rotatable tabletop 43 to rotate to a proper angle, at the moment, people manually clamp the rotatable tabletop 43 to prevent the rotatable tabletop 43 from rotating, and books are put on the rotatable tabletop 43 to achieve myopia prevention reading, after people read books, put books into the drawer 3, and push the drawer 3 back to the initial position, at this moment, the drawer 3 will drive the connection and drive the lifting plate 52 to move backward to the initial position, the first rack 55 will drive the one-way gear 53 to rotate reversely, the first torsion spring 54 will be recovered to the initial state from the stretching state, the one-way gear 53 will drive the first rotating shaft 42 to rotate reversely, the first rotating shaft 42 will drive the rotatable desktop 43 to recover to the horizontal state, at this moment, the connection and drive the lifting plate 52 will not support the rotatable desktop 43 any more, at this moment, the rotatable desktop will move downward to the initial position due to the action of gravity, the rotatable desktop 43 will drive the lifting connecting rod 41 to move downward to recover to the initial position, if people read books again, the above operation can be repeated.

Example 3

On the basis of embodiment 2, as shown in fig. 1, 4, 6 and 7, the table further includes a clamping mechanism 6, the clamping mechanism 6 includes a sliding fixing sleeve 61, a sliding clamping plate 62 and a return spring 63, two sliding fixing sleeves 61 are disposed on the lower side of the rear side of the rotatable table top 43, the sliding clamping plate 62 is slidably disposed on the sliding fixing sleeves 61, the return spring 63 is wound on the sliding clamping plate 62, and the lower side of the return spring 63 is connected to the sliding fixing sleeves 61.

When people are ready to read books, the drawer 3 is firstly opened, the sliding clamping plate 62 moves under the action of gravity, the reset spring 63 is compressed, the connection drives the ascending plate 52 to move forwards, the rotatable table top 43 moves upwards and rotates to a certain angle, the rotatable table top 43 drives the sliding fixing sleeve 61 to move upwards, the sliding fixing sleeve 61 drives the sliding clamping plate 62 to move upwards, people take out books and put the books on the rotatable table top 43, the sliding clamping plate 62 clamps the books, the reset spring 63 is compressed, the sliding clamping plate 62 clamps the books so as not to slide down, the rotatable table top 43 is clamped at the moment so as not to rotate and read the books, and therefore people are prevented from reading the myopia due to reading, after people read the books, the books are taken out from the sliding clamping half plate, the sliding clamping plate 62 moves downwards for a certain distance, reset spring 63 will be compressed, and people will put into drawer 3 with the book to push drawer 3 back to initial position, connect this moment and drive rising board 52 will resume to initial position, but rotatable desktop 43 will resume to initial position, and fixed cover 61 of sliding will resume to initial position, and sliding clamping plate 62 will resume to initial position, if people read the book once more, repeat above-mentioned operation can.

The clamping mechanism 7 comprises a blocking rod 71, a rotating connecting rod 72, a rotatable baffle 73 and a second torsion spring 74, the blocking rod 71 is arranged on the outer side of the sliding clamping plate 62, the rotating connecting rod 72 is arranged on the lower side of the rotatable table top 43 in a left-right symmetrical rotating mode, the rotatable baffle 73 is arranged on the lower side of the rotating connecting rod 72, the rotatable baffle 73 is matched with a straight gear 93, the second torsion spring 74 is wound on the rotatable baffle 73, and the second torsion spring 74 is connected with the rotating connecting rod 72.

When people are ready to read books, the drawer 3 is firstly opened, the sliding clamping plate 62 moves under the action of gravity, the return spring 63 is compressed, the connection drives the ascending plate 52 to move forwards, the rotatable table top 43 moves upwards, the rotatable table top 43 drives the rotating connecting rod 72 to move upwards, the first rack 55 drives the one-way gear 53 to rotate, the one-way gear 53 drives the first rotating shaft 42 to rotate, the first rotating shaft 42 drives the rotatable baffle plate 73 to rotate, the second torsion spring 74 reciprocates, the rotatable table top 43 drives the sliding fixing sleeve 61 to move upwards, the sliding fixing sleeve 61 drives the sliding clamping plate 62 to move upwards, the return spring 63 is compressed under the action of gravity of the sliding clamping plate 62, the sliding clamping plate 62 slides downwards under the action of gravity to clamp books, the sliding clamping plate 62 drives the blocking rod 71 to move downwards, the blocking rod 71 and the rotatable baffle 73 will block the rotation of the one-way gear 53, so that the first rotating shaft 42 will not rotate any more, and the rotatable desktop 43 will be fixed and will not rotate, at this time, people put the book under the sliding clamping plate 62 to read the book, after people read the book, the book will be taken out from the sliding clamping plate 62, put back into the drawer 3, and manually rotate the rotatable desktop 43 to the horizontal state, the sliding clamping plate 62 will return to the horizontal state, the blocking rod 71 will not block the one-way gear 53, the rotatable baffle 73 will return to the horizontal state, at this time, people will push the drawer 3 back to the initial position, the connecting belt moves the lifting plate 52 to the initial position, the first rack 55 will drive the one-way gear 53 to reverse, the first torsion spring 54 will be stretched, when the first rack 55 is not engaged with the one-way gear 53 any more, the first torsion spring 54 will return to the initial state from the stretched state, the one-way gear 53 will be restored to the initial state, the rotatable tabletop 43 will be restored to the initial position, the sliding clamping plate 62 will be restored to the initial position, the rotatable baffle 73 will be restored to the initial position, the blocking rod 71 will be restored to the initial state, and if people read the book again, the above operations will be repeated.

The blocking mechanism 8 comprises a rotary connecting plate 81, a second rotating shaft 82 and a rotary positioning plate 83, the two rotary connecting plates 81 are arranged on the front side of the lower portion of the connecting frame 2, the second rotating shaft 82 is rotatably arranged in the rotary connecting plates 81, and the rotary positioning plate 83 is arranged in the middle of the second rotating shaft 82.

When people are ready to read books, the drawer 3 is firstly opened, the sliding clamping plate 62 moves under the action of gravity, the return spring 63 is compressed, the connection drives the lifting plate 52 to move forwards, the rotatable table top 43 moves upwards for a certain distance, the first rotating shaft 42 drives the rotatable table top 43 to rotate for a certain angle, the stop rod 71 and the rotatable baffle 73 clamp the one-way gear 53 so that the one-way gear 53 does not rotate any more, the first torsion spring 54 cannot be reset, the rotatable table top 43 is fixed, the sliding clamping plate 62 moves upwards for a certain distance along with the rotatable table top 43, people put books under the sliding clamping plate 62, the return spring 63 is compressed, the rotating positioning plate 83 rotates outwards for one hundred eighty degrees, the rotating positioning plate 83 drives the second rotating shaft 82 to rotate, and the rotating positioning shaft clamps the distance of people when reading books and does not get too close to the books, after people read the book, the book is taken out of the sliding clamping plate 62 and put into the drawer 3, the people push the drawer 3 back to the initial position, the rotatable tabletop 43 is restored to the initial position, the sliding clamping plate 62 is restored to the initial position, the connecting belt drives the lifting plate 52 to be restored to the initial position, the first torsion spring 54 is restored to the initial position, the blocking rod 71 and the rotatable baffle plate 73 are restored to the initial position, the people rotate the rotating positioning plate 83 to the initial position, and if the people read the book again, the operation is repeated.

Still including lifting up rotatory canceling release mechanical system 9 automatically, it is including the fixed sliding sleeve board 91 of second to lift up rotatory canceling release mechanical system 9 automatically, wedge drive piece 92, spur gear 93 and

second rack

94, 2 anterior downside of connecting frame are equipped with the fixed sliding sleeve board 91 of two second, fixed sliding sleeve board 91 of second internal sliding type is connected with wedge drive piece 92, wedge drive piece 92 rear side and the cooperation of slip clamp plate 62, be equipped with two spur gears 93 on the

second pivot

82, 3 front side lower parts of drawer are equipped with two second racks 94, second rack 94 and spur gear 93 mesh.

When people are ready to read books, the drawer 3 is opened, the sliding clamping plate 62 moves under the action of gravity, the return spring 63 is compressed, the rotatable table top 43 moves upwards for a certain distance, the first rotating shaft 42 drives the rotatable table top 43 to rotate to a proper angle, the blocking rod 71 and the rotatable baffle 73 prevent the one-way gear 53 from rotating, so that the rotatable table top 43 is fixed, the sliding clamping plate 62 rotates for a certain angle, people put books under the sliding clamping plate 62, the sliding clamping plate 62 clamps the books, the drawer 3 drives the wedge-shaped driving block 92 to move forwards, the drawer 3 drives the second rack 94 to move forwards, the second rack 94 drives the straight gear 93 to rotate due to the fact that the second rack 94 is meshed with the straight gear 93, the straight gear 93 drives the second rotating shaft 82 to rotate, the second rotating shaft 82 drives the rotating positioning plate 83 to rotate by one hundred eighty degrees, thereby blocking the distance for reading, after reading, taking out the book from the sliding clamping plate 62, and putting the book into the drawer 3, rotating the rotatable desktop 43 to the horizontal, pushing the drawer 3 back to the initial position, the drawer 3 driving the wedge-shaped driving block 92 to move backward, the second rack 94 moving backward to the initial position, because the second rack 94 engaging with the spur gear 93, the second rack 94 driving the spur gear 93 to reverse, the spur gear 93 driving the second rotating shaft 82 to reverse, the second rotating shaft 82 driving the rotating positioning plate 83 to reverse to the initial position, the rotatable desktop 43 restoring to the initial position, the blocking rod 71 restoring to the initial position, the rotatable baffle plate 73 restoring to the initial position, the rear side of the wedge-shaped driving block 92 pushing against the sliding clamping plate 62, so that it will not slide down due to gravity, at this moment, the reset spring 63 restoring to the initial state, and if people read the book again, repeating the operation.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A desk with myopia prevention function is characterized in that: comprises the following steps:

the lifting support plate (1) is provided with a connecting frame (2);

the drawer (3) is arranged in the connecting frame (2) in a sliding manner;

the connecting frame (2) is provided with a lifting rotating mechanism (4);

the automatic lifting rotating mechanism (5) is arranged on the connecting frame (2), and the automatic lifting rotating mechanism (5) is matched with the lifting rotating mechanism (4).

2. The desk with the myopia prevention function according to claim 1, wherein the desk comprises: the lifting and rotating mechanism (4) comprises:

two lifting connecting rods (41) are arranged in the connecting frame (2);

the rotatable table top (43) is arranged on the lifting connecting rod (41);

the first rotating shaft (42) and the rotatable table top (43) are provided with two first rotating shafts (42) in a rotating way.

3. The desk with the myopia prevention function according to claim 2, wherein the desk comprises: the automatic lifting and rotating mechanism (5) comprises:

two first fixed sliding sleeve plates (51) are arranged on the connecting frame (2);

the connecting and driving lifting plates (52) are arranged in the first fixed sliding sleeve plate (51) in a sliding manner, the connecting and driving lifting plates (52) are connected with the movable lifting plates (52) and the drawer (3), and the movable lifting plates (52) are connected with the rotatable desktop (43) in a matching manner;

the outer sides of the first rotating shafts (42) are provided with one-way gears (53);

the first torsion springs (54) are wound on the outer sides of the first rotating shafts (42), and the first torsion springs (54) are connected with the one-way gear (53);

the first rack (55) is connected with the movable lifting plate (52) and is provided with the first rack (55), and the first rack (55) is matched with the one-way gear (53).

4. The desk with the myopia prevention function according to claim 3, wherein the desk comprises: still including clamping mechanism (6), clamping mechanism (6) including:

two sliding fixing sleeves (61) are arranged on the rotatable desktop (43);

the sliding clamping plate (62) is arranged on the sliding fixing sleeve (61) in a sliding manner;

the return spring (63) is wound on the sliding clamping plate (62), and the return spring (63) is connected with the sliding fixing sleeve (61).

5. The desk with the myopia prevention function according to claim 4, wherein the desk comprises: still including screens mechanism (7), screens mechanism (7) including:

the blocking rods (71) are arranged on the outer sides of the sliding clamping plates (62);

the rotatable desktop (43) is rotatably provided with two rotating connecting rods (72); the rotatable baffles (73) are arranged on the rotatable connecting rods (72), and the rotatable baffles (73) are matched with the straight gears (93);

the second torsion spring (74) is wound on the rotatable baffle plate (73), and the second torsion spring (74) is connected with the rotary connecting rod (72).

6. The desk with the myopia prevention function according to claim 5, wherein the desk comprises: still including blocking mechanism (8), blocking mechanism (8) including:

two rotary connecting plates (81) are arranged on the connecting frame (2);

the second rotating shaft (82) is rotatably arranged in the rotating connecting plate (81);

a rotary positioning plate (83), and the middle part of the second rotating shaft (82) is provided with the rotary positioning plate (83).

7. The desk with the myopia prevention function according to claim 6, wherein the desk comprises: still including automatic rotatory canceling release mechanical system (9) of lifting up, automatic rotatory canceling release mechanical system (9) of lifting up is including:

two second fixed sliding sleeve plates (91) are arranged on the connecting frame (2);

the wedge-shaped driving block (92) is connected with the second fixed sliding sleeve plate (91) in an inward sliding mode, and the wedge-shaped driving block (92) is matched with the sliding clamping plate (62);

the second rotating shaft (82) is provided with two straight gears (93);

two second racks (94) are arranged on the drawer (3), and the second racks (94) are meshed with the straight gear (93).

8. The desk with the myopia prevention function according to claim 7, wherein the desk comprises: the lifting support plate (1) is made of ironwork.