CN215423458U - Student desk with adjusting mechanism - Google Patents

Abstract

The utility model discloses a student desk with an adjusting mechanism, which comprises a desk plate, wherein the lower part of the desk plate is provided with a protective cover and an inner vertical plate, both sides of the protective cover are provided with connecting rods, the lower end of the connecting rod is fixedly connected with a second rotating shaft provided with pulleys, the second rotating shaft and a third rotating shaft are connected through a winding, the third rotating shaft is provided with the adjusting mechanism, the bottom of the second rotating shaft is provided with a first rotating shaft, both ends of the first rotating shaft are provided with gears matched with the racks on supporting legs, the first rotating shaft and a fourth rotating shaft are connected through a belt, the fourth rotating shaft is provided with the adjusting mechanism, the supporting legs are connected with a U-shaped plate fixed on an outer vertical plate in a sliding way, the utility model respectively adjusts the desktop inclination and the desktop height through two independent mechanisms, has rich adjusting function, and rapidly adjusts the desktop inclination or the desktop height through the adjusting mechanism, simple to use, convenient and fast.

Description

Student desk with adjusting mechanism

Technical Field

The utility model relates to the technical field of school supplies, in particular to a student desk with an adjusting mechanism.

Background

Along with the development of society, people pay more and more attention to the learning of children, and learning equipment matched with the learning equipment is continuously updated, such as teaching boards, test beds, desks and the like, wherein the desks for students are widely used.

The conventional school desk adjusting structure is inconvenient to operate, parts need to be detached when the adjusting mechanism is used, more time needs to be spent, and the conventional school desk is single in function, only can be used for adjusting the height of a desk top and is inconvenient to use.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model provides a student desk with an adjusting mechanism.

One of the purposes of the utility model is realized by adopting the following technical scheme:

a student desk with an adjusting mechanism comprises a desk plate, wherein a protective cover is fixedly connected to the lower portion of the desk plate, the rear side of the protective cover is arranged in an opening mode, connecting rods are arranged on the two sides of the protective cover, the top end of each connecting rod is hinged to the bottom of the desk plate, a second rotating shaft is fixedly connected to the lower ends of the two connecting rods, pulleys are fixedly connected to the left end and the right end of the second rotating shaft, a bearing is sleeved at the position, close to the central position, of the outer edge of the second rotating shaft, a winding wire is fixedly connected to the outer edge of the bearing, a third rotating shaft is arranged on the front side of the second rotating shaft, a winding roller is sleeved at the position, close to the right side, of the outer edge of the third rotating shaft, the winding roller is fixedly connected with a third rolling shaft, a first fixing mechanism is arranged at the position, close to the left end of the outer edge of the third rotating shaft, an inner vertical plate is arranged on one side, far away from the protective cover, of the connecting rods, the two ends of the third rotating shaft are respectively inserted on the adjacent inner vertical plates, the left end of the third rotating shaft penetrates through the adjacent inner vertical plates and is fixedly connected with a first L-shaped rocking handle, the two inner vertical plates are arranged in bilateral symmetry by taking the central axis of the table plate as a symmetry axis, the lower part of the second rotating shaft is provided with a first partition plate, the left side and the right side of the first partition plate are fixedly connected on the inner vertical plates, the lower part of the first partition plate is provided with a first rotating shaft, a first grooved pulley is sleeved at the position, close to the left side, of the outer edge of the first rotating shaft, the first grooved pulley is fixedly connected with the first rotating shaft, the left side and the right side of the first rotating shaft are fixedly connected with gears, the front side of the first rotating shaft is provided with a fourth rotating shaft, a second grooved pulley is sleeved at the position, close to the left side, of the outer edge of the fourth rotating shaft, the second grooved pulley is fixedly connected with the fourth rotating shaft, and a second fixing mechanism is arranged in the middle of the fourth rotating shaft, the utility model discloses a protection casing, including the protection casing, the protection casing is including the protection casing, the both ends of fourth pivot are pegged graft respectively on adjacent interior riser, the left end of fourth pivot runs through on the adjacent interior riser to fixedly connected with second L shape rocking handle, the lower part of fourth pivot is provided with the second baffle, the left and right sides fixed connection of second baffle is on the adjacent interior riser, one side fixedly connected with U-shaped board that the protection casing was kept away from to the interior riser, the inner chamber both sides of interior riser all are equipped with first fixed block, first fixed block is close to the rear side of interior riser, first fixed block fixed connection is in the lower part of table, the inner chamber of first fixed block runs through and is equipped with the round pin axle, on the inner wall of riser including the round pin axle pegs graft, two be close to front side department fixedly connected with outer riser between the interior riser, U-shaped board inner chamber has the landing leg.

Further, first fixed knot constructs including first ratchet, first ratchet cover is established at the third pivot outside edge and is close to left end department, the upper portion of first ratchet is provided with first fly leaf, the first stopper of lower part fixedly connected with of first fly leaf, first stopper is articulated with outer riser, the upper portion of first fly leaf is provided with first reed, first reed and outer riser fixed connection.

Further, the second fixed knot constructs including the second ratchet, the second ratchet cover is established at the edge of the fourth pivot outside and is close to left end department, the upper portion of second ratchet is provided with the second fly leaf, the lower part fixedly connected with second stopper of second fly leaf, second stopper is articulated with outer riser, the upper portion of second stopper is provided with the second reed, second reed and outer riser fixed connection.

Further, the upper end of landing leg extends to the inner chamber of U-shaped board, the rear side fixedly connected with rack of landing leg, just the rack is located the inner chamber of U-shaped board, wheel and rack intermeshing, the lower extreme and the heel brace fixed connection of landing leg.

Furthermore, a belt is arranged between the first grooved wheel and the second grooved wheel, and the first grooved wheel and the second grooved wheel are in transmission connection through the belt.

Further, one end of the winding wire, which is far away from the bearing, is wound on the winding roller.

Furthermore, the landing leg and the heel brace all use the central axis of the table board as the symmetry axis to present bilateral symmetry setting.

Compared with the prior art, the utility model has the beneficial effects that:

1. when the table top is used, the rocking handle is shaken to drive the mechanism to move, so that the aim of quickly adjusting the inclination degree or the height of the table top is fulfilled, the locking of the working state is completed through the adjusting device, and when the table top is required to return to the original position, the table top can be locked only by pulling the movable block off the arm, so that the aims of simple use, convenience and quickness are fulfilled;

2. when the multifunctional desk is used, the first adjusting device drives the connecting rod to achieve the purpose of adjusting the inclination of the desk top, the second adjusting device drives the gear to rotate, the rack on the supporting leg is meshed with the gear on the desk top, the gear rotates to change the height of the desk top, and the two independent mechanisms are used for adjusting the inclination of the desk top and the height of the desk top respectively, so that the aim of adjusting the inclination of the desk top is achieved.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.

Drawings

FIG. 1 is a perspective view of the present embodiment;

FIG. 2 is a front sectional view of the present embodiment;

FIG. 3 is a left side cross-sectional view of the inner vertical plate of the component of the present embodiment;

FIG. 4 is an enlarged view of the embodiment shown at A in FIG. 3;

FIG. 5 is a top cross-sectional view of the first shaft of the present embodiment;

FIG. 6 is a top sectional view of a second shaft of the present embodiment.

In the figure: 1. a table plate; 2. a pin shaft; 3. a first fixed block; 4. a U-shaped plate; 5. a support leg; 6. an inner vertical plate; 7. a pulley; 8. a first sheave; 9. a second movable plate; 10. a first rotating shaft; 11. a second rotating shaft; 12. a bearing; 13. a protective cover; 14. a connecting rod; 15. a rack; 16. a first separator; 17. a gear; 18. A second separator; 19. a foot support; 20. an outer vertical plate; 21. a first reed; 22. a first stopper; 23. a first L-shaped rocking handle; 24. a first ratchet wheel; 25. a third rotating shaft; 26. a second stopper; 27. a second L-shaped rocking handle; 28. winding; 29. a second reed; 30. a belt; 31. a second ratchet wheel; 32. a fourth rotating shaft; 33. A second sheave; 34. a winding roller; 35. a first movable plate.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 6, a student desk with an adjusting mechanism comprises a desk board 1, a protective cover 13 is fixedly connected to the lower portion of the desk board 1, the rear side of the protective cover 13 is open, connecting rods 14 are respectively arranged on both sides of the protective cover 13, the top ends of the connecting rods 14 are hinged to the bottom of the desk board 1, the lower ends of the two connecting rods 14 are fixedly connected to a second rotating shaft 11, the left and right ends of the second rotating shaft 11 are fixedly connected to pulleys 7, a bearing 12 is sleeved on the outer edge of the second rotating shaft 11 near the center, a winding 28 is fixedly connected to the outer edge of the bearing 12, a third rotating shaft 25 is arranged on the front side of the second rotating shaft 11, a winding roller 34 is sleeved on the outer edge of the third rotating shaft 25 near the right side, one end of the winding 28 far away from the bearing 12 is wound on the winding roller 34, the winding roller 34 is fixedly connected to the third rotating shaft, a first fixing mechanism is arranged on the outer edge of the third rotating shaft 25 near the left end, the first fixing structure comprises a first ratchet wheel 24, the first ratchet wheel 24 is sleeved on the outer edge of the third rotating shaft 25 near the left end, a first movable plate 35 is arranged on the upper portion of the first ratchet wheel 24, a first stop block 22 is fixedly connected to the lower portion of the first movable plate 35, the first stop block 22 is hinged to the outer vertical plate 20, a first reed 21 is arranged on the upper portion of the first movable plate 35, the first reed 21 is fixedly connected with the outer vertical plate 20, an inner vertical plate 6 is arranged on one side of the connecting rod 14 away from the protective cover 13, two ends of the third rotating shaft 25 are respectively inserted into the adjacent inner vertical plates 6, the left end of the third rotating shaft 25 penetrates through the adjacent inner vertical plates 6 and is fixedly connected with a first L-shaped rocking handle 23, the two inner vertical plates 6 are arranged in bilateral symmetry by taking the central axis of the table plate 1 as a symmetry axis, a first partition plate 16 is arranged on the lower portion of the second rotating shaft 11, and the left and right sides of the first partition plate 16 are fixedly connected to the inner vertical plates 6, a first rotating shaft 10 is arranged at the lower part of the first partition 16, a first grooved pulley 8 is sleeved at the outer edge of the first rotating shaft 10 close to the left end, the first grooved pulley 8 and the first rotating shaft 10 are fixedly connected, gears 17 are fixedly connected at the left and right sides of the first rotating shaft 10, a fourth rotating shaft 32 is arranged at the front side of the first rotating shaft 10, a second grooved pulley 33 is sleeved at the outer edge of the fourth rotating shaft 32 close to the left end, the second grooved pulley 33 and the fourth rotating shaft 32 are fixedly connected, a belt 30 is arranged between the first grooved pulley 8 and the second grooved pulley 33, the first grooved pulley 8 and the second grooved pulley 33 are in transmission connection through the belt 30, a second fixing mechanism is arranged at the middle part of the fourth rotating shaft 32, the second fixing mechanism comprises a second ratchet wheel 31, the second ratchet wheel 31 is sleeved at the outer edge of the fourth rotating shaft 32 close to the left end, a second movable plate 9 is arranged at the upper part of the second ratchet wheel 31, a second stopper 26 is fixedly connected at the lower part of the second movable plate 9, the second stop block 26 is hinged with the outer vertical plate 20, the upper part of the second stop block 26 is provided with a second reed 29, the second reed 29 is fixedly connected with the outer vertical plate 20, two ends of a fourth rotating shaft 32 are respectively inserted on the adjacent inner vertical plates 6, the left end of the fourth rotating shaft 32 penetrates through the adjacent inner vertical plates 6 and is fixedly connected with a second L-shaped rocking handle 27, the utility model can rapidly adjust the inclination of the table top or the height of the table top by rocking the rocking handle to drive the mechanism to move when in use, and then the locking of the working state is completed by an adjusting device, when the original position is required to be restored, the operation can be completed by only moving the movable block, thereby achieving the purposes of simple use, convenience and rapidness, the lower part of the fourth rotating shaft 32 is provided with a second partition plate 18, the left side and the right side of the second partition plate 18 are fixedly connected on the adjacent inner vertical plates 6, and one side of the inner vertical plate 6 far away from the protective cover 13 is fixedly connected with a U-shaped plate 4, the upper end of the supporting leg 5 extends to the inner cavity of the U-shaped plate 4, the rear side of the supporting leg 5 is fixedly connected with a rack 15, the rack 15 is positioned in the inner cavity of the U-shaped plate 4, a gear 17 is meshed with the rack 15, the lower end of the supporting leg 5 is fixedly connected with a foot support 19, two sides of the inner cavity of the inner vertical plate 6 are respectively provided with a first fixing block 3, the first fixing blocks 3 are close to the rear side of the inner vertical plate 6, the first fixing blocks 3 are fixedly connected to the lower part of the table plate 1, the inner cavity of the first fixing blocks 3 is provided with a pin shaft 2 in a penetrating mode, the pin shafts 2 are inserted into the inner wall of the inner vertical plate 6, an outer vertical plate 20 is fixedly connected between the two inner vertical plates 6 close to the front side, the supporting leg 5 is arranged in the inner cavity of the U-shaped plate 4, the supporting leg 5 and the foot support 19 are arranged in a left-right symmetrical mode by taking the central axis of the table plate 1 as a symmetrical axis, and a first adjusting device is used for driving a connecting rod 14 so as to achieve the purpose of adjusting the inclination of the table top, the rotation of the gear 17 is driven by the second adjusting device, the rack 15 on the supporting leg 5 is meshed with the gear 17 of the table board 1, the height of the table top is changed by the rotation of the gear 17, the inclination of the table top and the height of the table top are respectively adjusted by two independent mechanisms, and therefore the purpose of being rich in adjusting function is achieved.

The working principle is as follows: when the inclination of the table board 1 needs to be increased, the first L-shaped rocking handle 23 is rotated, the first L-shaped rocking handle 23 transmits the rotation to the third rotating shaft 25, the first ratchet 24 on the third rotating shaft 25 starts to rotate, but because the first ratchet 24 is not controlled by the first stop block 22 at this time, the adjusting mechanism is not stressed, meanwhile, the rotation of the third rotating shaft 25 drives the winding roller 34 to rotate, the winding roller 34 rotates to wind the winding 28 tightly, the other end of the winding 28 is fixedly connected to the bearing 12, the winding 28 starts to pull the bearing 12 to the front side of the first partition board 16, the movement of the bearing 12 drives the second rotating shaft 11 to move to the front side of the first partition board 16, the pulleys 7 at the two sides of the second rotating shaft 11 start to roll on the upper portion of the first partition board 16, the movement of the second rotating shaft 11 drives the connecting rod 14 to move, because the upper end of the connecting rod 14 is hinged inside the table board 1, so that the connecting rod 14 rotates around the hinged portion, the rear side of the table board 1 is fixedly connected with the first fixed block 3, the first fixed block 3 is hinged with the inner vertical plate 6 through the pin shaft 2, so the table board 1 can rotate around the hinged position, the rotating connecting rod 14 cannot move downwards because the pulley 7 at the lower part is restrained by the first partition plate 16, so the table board 1 is jacked up, and the inclination of the table board 1 is increased, at the moment, the first ratchet wheel 24 is meshed with the first stop block 22 under the action of the first reed 21, the adjusting mechanism is stressed, so the table board 1 cannot move downwards, when the inclination of the table board 1 needs to be reduced, only the front end of the first movable plate 35 needs to be pulled towards the ground direction, as the first movable plate 35 is hinged on the outer vertical plate 20, the rear end of the first movable plate 35 tilts upwards, at the moment, the latch of the first movable plate 35 is not meshed with the first ratchet wheel 24, and the table board 1 starts to move downwards under the action of gravity, because the adjusting device does not take any resistance, the table 1 returns to the original position, then the front end of the first movable plate 35 is loosened, because the upper part of the rear end of the first movable plate 35 is provided with the first reed 21, the front end of the first reed 21 is fixedly connected to the outer vertical plate 20, under the action of the first reed 21, the first stop block 22 under the first movable plate 35 starts to be engaged with the first ratchet wheel 24 again, when the height of the table 1 needs to be increased, the second L-shaped crank 27 is rotated, the second L-shaped crank 27 transmits the rotation to the fourth rotating shaft 32, the second ratchet wheel 31 on the fourth rotating shaft 32 starts to rotate, but because the second ratchet wheel 31 is not controlled by the second movable plate 9 at this time, the adjusting mechanism is not stressed, meanwhile, the rotation of the fourth rotating shaft 32 drives the first sheave 8 to rotate, the first sheave 8 transmits the rotation to the second sheave 33 through the belt 30, and the rotation of the second sheave 33 drives the rotation of the first rotating shaft 10, the rotation of the first rotating shaft 10 drives the gears 17 at two sides to rotate, the gears 17 rotate in the cavities of the supporting legs 5, because the racks 15 are arranged in the cavities of the supporting legs 5, the racks 15 and the gears 17 are engaged with each other, the gears 17 start to climb towards the direction of the table board 1, so as to drive the first rotating shaft 10 to climb, the first rotating shaft 10 is fixedly connected with the second partition board 18 through the inner vertical plate 6, so as to drive the second partition board 18 to climb, because the second partition board 18 is fixedly connected with the table board 1 through the inner vertical plate 6, so as to achieve the purpose of improving the height of the table board 1, at the moment, the second ratchet wheel 31 is engaged with the second stop block 26 under the action of the second reed 29, the adjusting mechanism is stressed, so that the table board 1 cannot move downwards, when the height of the table board 1 needs to be reduced, only the front end of the second movable plate 9 needs to be pulled towards the ground direction, because the second movable plate 9 is hinged on the outer vertical plate 20, the rear end of the second movable plate 9 tilts upwards, at this time, the latch on the second movable plate 9 is not engaged with the second ratchet wheel 31, under the action of gravity, the table 1 starts to move downwards, because the adjusting mechanism does not receive any resistance, the table 1 starts to descend until the top of the leg 5 is pressed against the top of the inner cavity of the U-shaped plate 4, the table 1 stops descending, then the front end of the second movable plate 9 is released, and because the upper part of the rear end of the second movable plate 9 is provided with the second spring 29, the front end of the second spring 29 is fixedly connected to the outer vertical plate 20, under the action of the second spring 29, the second movable plate 9 starts to be engaged with the second ratchet wheel 31 again.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.

Claims (7)

1. The utility model provides a student desk with adjustment mechanism, includes table (1), its characterized in that: the utility model discloses a table, including table (1), the lower part fixedly connected with protection casing (13) of table (1), the rear side of protection casing (13) sets up for the opening, the both sides of protection casing (13) all are equipped with connecting rod (14), the top of connecting rod (14) articulates in the bottom of table (1), two the common fixedly connected with second pivot (11) of lower extreme of connecting rod (14), the equal fixedly connected with pulley (7) in both ends about second pivot (11), the outside edge of second pivot (11) is close to central point department of putting and is equipped with bearing (12), the outside edge fixedly connected with wire winding (28) of bearing (12), the front side of second pivot (11) is provided with third pivot (25), the outside edge of third pivot (25) is close to right side cover and is equipped with wire winding roller (34), wire winding roller (34) and third roller fixed connection, a first fixing mechanism is arranged at the position, close to the left end, of the outer edge of the third rotating shaft (25), an inner vertical plate (6) is arranged at one side, away from the protective cover (13), of the connecting rod (14), two ends of the third rotating shaft (25) are respectively inserted into the adjacent inner vertical plates (6), the left end of the third rotating shaft (25) penetrates through the adjacent inner vertical plates (6) and is fixedly connected with a first L-shaped rocking handle (23), the two inner vertical plates (6) are arranged in bilateral symmetry by taking the central axis of the table plate (1) as a symmetry axis, a first partition plate (16) is arranged at the lower part of the second rotating shaft (11), the left side and the right side of the first partition plate (16) are fixedly connected onto the inner vertical plates (6), a first rotating shaft (10) is arranged at the lower part of the first partition plate (16), a first sheave (8) is sleeved at the position, close to the left end, of the outer edge of the first rotating shaft (10), the first grooved pulley (8) is fixedly connected with the first rotating shaft (10), gears (17) are fixedly connected with the left side and the right side of the first rotating shaft (10), a fourth rotating shaft (32) is arranged on the front side of the first rotating shaft (10), a second grooved pulley (33) is sleeved on the outer edge of the fourth rotating shaft (32) close to the left side, the second grooved pulley (33) is fixedly connected with the fourth rotating shaft (32), a second fixing mechanism is arranged in the middle of the fourth rotating shaft (32), two ends of the fourth rotating shaft (32) are respectively inserted into adjacent inner vertical plates (6), the left end of the fourth rotating shaft (32) penetrates through the adjacent inner vertical plates (6) and is fixedly connected with a second L-shaped rocking handle (27), a second partition plate (18) is arranged on the lower portion of the fourth rotating shaft (32), and the left side and the right side of the second partition plate (18) are fixedly connected with the adjacent inner vertical plates (6), one side fixedly connected with U-shaped plate (4) of protection casing (13) are kept away from in riser (6), the inner chamber both sides of interior riser (6) all are equipped with first fixed block (3), the rear side of interior riser (6) is close to in first fixed block (3), first fixed block (3) fixed connection is in the lower part of table (1), the inner chamber of first fixed block (3) runs through and is equipped with round pin axle (2), peg graft on the inner wall of interior riser (6) including round pin axle (2), two be close to front side department fixedly connected with outer riser (20) between interior riser (6), U-shaped plate (4) inner chamber has landing leg (5).

2. A student desk with an adjustment mechanism as claimed in claim 1 wherein: first fixed knot constructs including first ratchet (24), first ratchet (24) cover is established and is close to left end department at third pivot (25) outside edge, the upper portion of first ratchet (24) is provided with first fly leaf (35), the first stopper of lower part fixedly connected with (22) of first fly leaf (35), first stopper (22) are articulated with outer riser (20), the upper portion of first fly leaf (35) is provided with first reed (21), first reed (21) and outer riser (20) fixed connection.

3. A student desk with an adjustment mechanism as claimed in claim 1 wherein: the second fixed knot constructs including second ratchet (31), second ratchet (31) cover is established and is close to left end department at fourth pivot (32) outside edge, the upper portion of second ratchet (31) is provided with second fly leaf (9), the lower part fixedly connected with second stopper (26) of second fly leaf (9), second stopper (26) are articulated with outer riser (20), the upper portion of second stopper (26) is provided with second reed (29), second reed (29) and outer riser (20) fixed connection.

4. A student desk with an adjustment mechanism as claimed in claim 1 wherein: the upper end of landing leg (5) extends to the inner chamber of U-shaped board (4), the rear side fixedly connected with rack (15) of landing leg (5), just rack (15) are located the inner chamber of U-shaped board (4), gear (17) and rack (15) intermeshing, the lower extreme and heel brace (19) fixed connection of landing leg (5).

5. A student desk with an adjustment mechanism as claimed in claim 1 wherein: a belt (30) is arranged between the first sheave (8) and the second sheave (33), and the first sheave (8) and the second sheave (33) are in transmission connection through the belt (30).

6. A student desk with an adjustment mechanism as claimed in claim 1 wherein: and one end of the winding wire (28) far away from the bearing (12) is wound on a winding roller (34).

7. A student desk with an adjustment mechanism as claimed in claim 1 wherein: the supporting legs (5) and the foot supports (19) are arranged in a bilateral symmetry mode by taking the central axis of the table board (1) as a symmetry axis.

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