Folding desk and chair based on ergonomics and use method

Abstract

The invention relates to the technical field of desks and chairs, and discloses a folding desk and chair based on ergonomics, the folding desk and chair comprises a desk and a chair, the desk comprises a desk plate located in the desk and desk legs welded to the two sides of the bottom of the desk plate, the chair comprises a chair seat located in the chair, and a backrest is rotatably mounted on one side of the chair seat; supporting legs are welded to the four corners of the bottom of the chair seat, a cushion is placed on the top of the chair seat, and handrail fences are welded to the left side and the right side of the top of the chair seat. According to the folding desk and chair based on ergonomics and the using method, through multi-gear angle adjustment of the adjusting assembly, a student is prevented from lowering the head and looking down in the reading process, and neck muscle fatigue and cervical vertebra problems are reduced; the limiting assembly and the fixing assembly can flexibly adjust the angle of the backrest to meet the back supporting requirements of different students, the cushion and the handrail bars are matched, the long-time sitting comfort is improved, the body strain risk is reduced, the human engineering design is met, and the body health of the students can be effectively protected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of desk and chair, in particular to a folding desk and chair based on human engineering and a use method thereof. BACKGROUND

[0002] Human engineering, also known as human engineering, human engineering, human engineering, human engineering or human engineering (Ergonomics); Ergonomics is originally from Greek "Ergo", which means "work, labor" and "nomos" which means "law, effect", that is, the law of labor, work effect, efficiency; Human engineering is composed of 6 branches, namely: anthropometry, biomechanics, labor physiology, environmental physiology, engineering psychology, time and work research.

[0003] According to the search, according to the invention disclosed in the patent with the patent number "CN117442012A", a kind of human engineering kindergarten desk and chair, including table, the front of table is provided with first controller, the lower part of table is fixedly connected with first connecting block, first connecting block is slidably connected with fixed block in the inside, the left side of table is horizontally provided with chair, the upper part of chair is provided with massage structure for massaging the neck of young children, the lower part of massage structure is provided with collection structure for collecting dust, the lower part of chair is provided with heat preservation structure for protecting the leg of young children, the present application can protect the neck of young children by the cooperation of first pulley, swing rod, second pulley and rotating column and other structures, It can also massage the spine and neck of young children, comfortable massage can promote the blood circulation of young children, increase oxygen supply, thereby improve attention and concentration, help young children better participate in learning and activities.

[0004] Although the device can well protect the neck of young children, the desktop of the desk is a fixed structure and cannot be adjusted in angle according to the learning scene needs of students, so students need to bend down to look at the desktop when reading, and long-term maintenance of this posture can easily cause neck muscle fatigue and even cause cervical problems.

[0005] Therefore, a folding desk and chair based on human engineering and a use method thereof are proposed to solve the above-mentioned problems. SUMMARY

[0006] (I) Technical problems solved

[0007] In view of the shortcomings of the prior art, the present application provides a folding desk and chair based on ergonomics and a use method, which has the advantages of adjusting the angle of the desktop according to the learning scene, solves the problem that the desktop of the desk is a fixed structure and cannot be adjusted in angle according to the learning scene needs of students, and the students need to lower their heads to look down at the desktop when reading, which can easily cause neck muscle fatigue and even cervical problems if this posture is maintained for a long time.

[0008] (II) Technical solutions

[0009] To achieve the above-mentioned purpose of adjusting the angle of the desktop according to the learning scene, the present application provides the following technical solutions: a folding desk and chair based on ergonomics, comprising a desk and a chair, the desk comprises a desktop located inside the desk and desk legs welded on both sides of the bottom of the desktop, the chair comprises a seat located inside the chair, one side of the seat is rotatably installed with a backrest, the bottom of the seat is welded with support legs at the four corners, a seat cushion is placed on the top of the seat, and handrails are welded on the left and right sides of the top of the seat;

[0010] A adjusting assembly is installed on the top of the desktop, the adjusting assembly comprises a receiving cavity opened in the interior of the desktop, a rotating shaft is rotatably installed on both sides of the inner walls of the receiving cavity, an adjusting placement plate is fixedly installed between the two rotating shafts, two receiving grooves are opened on the back of the adjusting placement plate, a support plate is rotatably installed in the interior of the two receiving grooves, two groups of limiting grooves are opened in the interior of the desktop and on the top of the receiving cavity, and an LED light bar is pasted on the surface of the desktop and close to the upper end;

[0011] A limiting assembly is fixedly installed in the interior of the seat, the limiting assembly comprises a movable cavity opened in the interior of the seat, a worm is rotatably installed in the interior of the movable cavity and on both sides of the backrest, a rotating rod is rotatably installed in the interior of the movable cavity and on the top of the worm, a worm wheel is fixedly installed on the surface of both ends of the rotating rod, a driven bevel gear is fixedly installed on the left side of the two worms, a pressing rod extending into the interior of the movable cavity is movably installed on the front and rear sides of the seat, a driving bevel gear is fixedly installed on the surface of the two pressing rods, and a strong spring is fixedly installed on the opposite side of the two driving bevel gears.

[0012] Preferably, the inside of the backrest is fixedly provided with a fixing assembly, the fixing assembly comprises two rectangular grooves arranged on the back of the backrest, two auxiliary rods are rotatably arranged in the two rectangular grooves, two movable grooves are arranged on the left and right sides of the seat and in the two rectangular grooves, two rotating shafts are fixedly arranged in the inside of the two auxiliary rods and close to the upper end, two ratchets are fixedly arranged on the surface of the two rotating shafts and on the two sides of the auxiliary rods, two vertical plates are fixedly arranged on the inner top wall of the two movable grooves, two reset springs are fixedly arranged on the inner wall of the two vertical plates, two pawls are rotatably arranged on the surface of the two vertical plates, two armatures are fixedly arranged on the surface of the two pawls, and two electromagnets are fixedly arranged on the inner wall of the two movable grooves and close to the armatures.

[0013] Preferably, the two movable grooves are arranged close to the top of the rectangular groove, the reset springs are fixedly connected with the inner wall of the pawl away from the vertical plate, and the two pawls are clamped into the tooth groove of the ratchet.

[0014] Preferably, the two auxiliary rods are matched with the rectangular grooves, the length of the two auxiliary rods is on the same horizontal plane as the bottom of the supporting leg, and the two electromagnets are attracted to the armatures.

[0015] Preferably, the two movable grooves are arranged close to the top of the rectangular groove, the reset springs are fixedly connected with the inner wall of the pawl away from the vertical plate, and the two pawls are clamped into the tooth groove of the ratchet.

[0016] Preferably, one end of the two supporting plates is rotatably connected with the inner wall of the receiving groove through the movable shaft, and the size of the two supporting plates is matched with the receiving cavity.

[0017] Preferably, the surface of the left and right sides of the seat is provided with a through hole matched with the pressing rod, and the side away from the pressing rod of the two pressing rods extends to the outside of the seat through the through hole; and the side opposite to the strong spring is fixedly connected with the inside of the movable cavity.

[0018] Preferably, the surface of the two driving bevel gears is meshed with the surface of the driven bevel gear, and the surface of the two worms is meshed with the surface of the worm wheel; and the surface of the rotating rod is fixedly connected with one end of the backrest.

[0019] A using method of the folding desk and chair based on ergonomics, comprising the following steps:

[0020] S1: when reading is needed, the adjusting placing plate can be adjusted to an adaptive state, and the adjusting placing plate can be manually turned out of the receiving cavity around the rotating shaft during the adjusting;

[0021] S2: then the supporting plate is turned out of the receiving groove, and one end of the supporting plate away from the receiving groove is clamped into the limiting groove in the corresponding position;

[0022] S3: When the angle of the adjustment placement plate needs to be adjusted, the support plate is taken out and reinserted into other limiting grooves, and when the LED light bar needs to be used, the corresponding control switch is turned on;

[0023] S4: When the angle of the backrest is adjusted, the pressing rod on the outside of the seat is pressed, the main and driven bevel gears are separated, and the strong spring is compressed, the backrest is rotated to the target angle, the backrest is rotated through the rotating rod to drive the worm gear to rotate, the rotation of the worm gear drives the worm to rotate, and when the appropriate position is reached, the pressing rod is released, the driving bevel gear is pushed by the elastic force of the strong spring to move, so that the driving bevel gear and the driven bevel gear are engaged, thereby limiting the worm;

[0024] S5: When the backrest needs to be adjusted to 180°, the electromagnet is powered on, the electromagnet is attracted to the armature after being powered on, the pawl is separated from the ratchet wheel, and then the auxiliary rod is manually turned out of the rectangular groove until the bottom of the auxiliary rod contacts the supporting surface;

[0025] S6: Then the electromagnet is powered off, and the pawl is pulled into the ratchet wheel by the elastic force of the reset spring to achieve limiting;

[0026] S7: When the components need to be stored, the reverse operation of steps 1-6 can be performed.

[0027] Advantages

[0028] Compared with the prior art, the present application provides a folding desk and chair based on ergonomics and a use method, which has the following advantages:

[0029] 1. The folding desk and chair based on ergonomics and the use method, by adjusting the multi-position angle adjustment of the adjusting assembly, avoid students from bending over when reading, reduce neck muscle fatigue and cervical problems; the limiting assembly and the fixing assembly can flexibly adjust the angle of the backrest to adapt to the back support needs of different students, cooperate with the seat cushion and the handrail, improve the comfort of sitting for a long time, reduce the risk of physical strain, and meet the ergonomic design, which can effectively protect the health of students.

[0030] 2. The folding desk and chair based on ergonomics and the use method, the adjusting placement plate and the support plate of the adjusting assembly can be stored, saving space; the limiting assembly can quickly adjust and lock the angle of the backrest through the pressing rod, and the fixing assembly can stably keep the backrest at 180°, meeting the needs of various scenes such as learning and resting, and the operation logic of each component is unified, which is convenient for students to use. DETAILED DESCRIPTION

[0031] Figure 1 It is a structure perspective view of the folding desk and chair based on ergonomics of the present application;

[0032] Figure 2 Figure 1 is a perspective view of the folding desk and chair structure according to the present application;

[0033] Figure 3 Figure 2 is a perspective view of the chair structure according to the present application;

[0034] Figure 4 Figure 3 is a perspective view of the adjusting assembly structure according to the present application;

[0035] Figure 5 Figure 4 is a sectional perspective view of the limiting assembly structure according to the present application;

[0036] Figure 6 Figure 5 is a perspective view of the fixing assembly structure according to the present application Figure 5 Figure 6 is an enlarged view of the structure at A in Figure 5;

[0037] Figure 7 Figure 7 is a side view of the fixing assembly structure according to the present application;

[0038] Figure 8 Figure 8 is an enlarged view of the structure at B in Figure 5. Figure 7

[0039] Figure 1 is a perspective view of the folding desk and chair structure according to the present application;

[0040] Figure 2 is a perspective view of the chair structure according to the present application;

[0041] Figure 3 is a perspective view of the adjusting assembly structure according to the present application;

[0042] Figure 4 is a sectional perspective view of the limiting assembly structure according to the present application;

[0043] Figure 5 is a perspective view of the fixing assembly structure according to the present application DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0045] ​Embodiment One

[0046] Please refer to Figures 1-8 , an ergonomic folding desk and chair, including a desk 1 and a chair 2, the desk 1 includes a desk plate 101 inside the desk 1 and a desk leg 102 welded on both sides of the bottom of the desk plate 101, the chair 2 includes a seat 201 inside the chair 2, a backrest 202 is rotatably installed on one side of the seat 201, support legs 203 are welded at the four corners of the bottom of the seat 201, a cushion 204 is placed on the top of the seat 201, and armrests 205 are welded on the left and right sides of the top of the seat 201.

[0047] In this embodiment, the desk plate 101 of the desk 1 is welded and fixed with the desk leg 102, which ensures the stability of the overall structure of the desk 1 and can provide a stable learning platform for students; the seat 201 of the chair 2 is rotatably installed with the backrest 202, which can adapt to different sitting postures of students and improve the comfort of the back; the support legs 203 at the four corners of the bottom of the seat 201 enhance the stability of the chair 2 and prevent it from shaking during use; the cushion 204 on the top of the seat 201 can increase the softness of the contact with the hips and improve the comfort of long sitting; the armrests 205 on the top of the seat 201 can provide support for the arms of students and relieve shoulder fatigue.

[0048] The top of the desk plate 101 is provided with an adjusting assembly 3, the adjusting assembly 3 includes a receiving cavity 301 formed in the inside of the desk plate 101, two rotating shafts 302 are rotatably installed on the inner walls of the left and right sides of the receiving cavity 301, an adjusting placement plate 303 is fixedly installed between the two rotating shafts 302, two receiving grooves 304 are formed in the back of the adjusting placement plate 303, a support plate 305 is rotatably installed in each of the two receiving grooves 304, two groups of limiting grooves 306 are formed in the inside of the receiving cavity 301 and at the top of the receiving cavity 301, and an LED light bar 307 is attached to the surface of the desk plate 101 near the upper end.

[0049] Each of the two groups of limiting grooves 306 has five limiting grooves 306, each limiting groove 306 is matched with the support plate 305, one end of each of the two support plates 305 away from the receiving groove 304 is clamped into the limiting groove 306, one end of each of the two support plates 305 is rotatably connected with the inner wall of the receiving groove 304 through a movable shaft, and the size of each of the two support plates 305 is matched with the receiving cavity 301.

[0050] In this embodiment, the manually adjusting placement plate 303 is rotated in the receiving cavity 301 by means of the rotating shaft 302 to realize the switching between unfolding and storage, after unfolding, the support plate 305 is rotated out of the receiving groove 304 around the movable shaft, and the other end of the support plate 305 is clamped into different limiting grooves 306 to fix the inclination angle of the adjusting placement plate 303; at the same time, the LED light bar 307 is attached to the surface of the desk plate 101, which can be directly used to provide illumination when the light is insufficient.

[0051] In the embodiment, the adjusting placing plate 303 can be rotated through the rotating shaft 302 and matched with the clamping of the multi-gear limiting groove 306 of the supporting plate 305 to realize the adjustment of different inclination angles, avoid the students from lowering their heads to view the desktop when reading, and reduce the neck muscle fatigue and the occurrence of cervical problems; the rigid connection of the supporting plate 305 and the limiting groove 306 ensures the stability of the angle, prevents the deviation in use, and improves the safety; the components can be stored in the storage cavity 301 and the storage groove 304 to save the space and avoid the bumping; the LED light bar 307 supplements the illumination to further optimize the learning environment and improve the comfort.

[0052] Embodiment two

[0053] Please refer to Figures 1-8 A folding desk and chair based on ergonomics, including a limiting assembly 4 fixedly installed in the inside of a seat 201, the limiting assembly 4 including an activity cavity 401 opened in the inside of the seat 201, a worm 402 rotatably installed in the inside of the activity cavity 401 and located at both sides of a backrest 202, a rotating rod 403 rotatably installed in the inside of the activity cavity 401 and located at the top of the worm 402, a worm wheel 404 fixedly installed on the surface of both ends of the rotating rod 403, a driven bevel gear 405 fixedly installed on the left side of both worms 402, a pressing rod 406 movably installed on the front and back sides of the seat 201 and extending to the inside of the activity cavity 401, a driving bevel gear 407 fixedly installed on the surface of both pressing rods 406, and a strong spring 408 fixedly installed on the opposite side of both driving bevel gears 407.

[0054] The surface of both left and right sides of the seat 201 is provided with a through opening matched with the pressing rod 406, and the side, away from each other, of both pressing rods 406 extends to the outside of the seat 201 through the through opening; the opposite side of both strong springs 408 is fixedly connected with the inside of the activity cavity 401; the surface of both driving bevel gears 407 is engaged with the surface of the driven bevel gear 405, and the surface of both worms 402 is engaged with the surface of the worm wheel 404; the surface of the rotating rod 403 is fixedly connected with one end of the backrest 202.

[0055] In the embodiment, when the backrest 202 needs to be adjusted, the pressing rod 406 on the outside of the seat 201 is pressed to drive the driving bevel gear 407 to move to the inside of the activity cavity 401, the strong spring 408 is compressed, the driving bevel gear 407 is disengaged from the driven bevel gear 405, then the back force drives the rotating rod 403 to rotate, the worm 402 is rotated due to the engagement of the worm wheel 404, and the rotating of the worm wheel 404 drives the worm 402 to rotate, when the angle is determined, the pressing rod 406 is released, the strong spring 408 is reset, the driving bevel gear 407 is engaged with the driven bevel gear 405, and the angle of the backrest 202 is fixed.

[0056] The angle of the backrest 202 is adjusted by pressing the lever 406 to match the gear, the worm 402 and the worm gear 404, which is simple to operate and adapts to the back support needs of different students. The powerful spring 408 resets and quickly locks the angle, avoids self-rotation of the backrest 202, and improves the stability of use. The transmission components are located inside the movable cavity 401, reducing external wear and tear and prolonging the service life. The transmission structure is symmetrically arranged on both sides, so that the backrest 202 is balanced in force and the adjustment process is more stable.

[0057] The inside of the backrest 202 is fixedly installed with a fixing assembly 5, which includes two rectangular grooves 501 formed on the back of the backrest 202. The inside of each of the two rectangular grooves 501 is rotatably installed with an auxiliary rod 502. The inside of the chair seat 201 and on the left and right sides of the two rectangular grooves 501 are both provided with movable grooves 503. The inside of each of the two auxiliary rods 502 and close to the upper end is fixedly installed with a rotating shaft 504. The surface of each of the two rotating shafts 504 and on the two sides of the auxiliary rod 502 is fixedly installed with a ratchet wheel 505. The inner top wall of each of the two movable grooves 503 is fixedly installed with two vertical plates 506. The inner wall of each of the two groups of vertical plates 506 is fixedly installed with a reset spring 507. The surface of each of the two groups of ratchet claws 508 is fixedly installed with an armature 509. The inner wall of each of the two movable grooves 503 is fixedly installed with an electromagnet 510 close to the armature 509.

[0058] Each of the two groups of movable grooves 503 is arranged close to the top of the rectangular groove 501. The side of each of the two groups of reset springs 507 away from the vertical plate 506 is fixedly connected with the inner wall of the ratchet claw 508. Each of the two groups of ratchet claws 508 is clamped into the tooth groove of the ratchet wheel 505. Each of the two auxiliary rods 502 is adapted to the rectangular groove 501. The length of each of the two auxiliary rods 502 extends to the same horizontal plane as the bottom of the supporting leg 203. Each of the two groups of electromagnets 510 is attracted to the armature 509. The surface of one side of the backrest 202 is fixedly installed with a controller for controlling the opening and closing of the electromagnet 510.

[0059] In this embodiment, when the limiting assembly 4 adjusts the backrest 202 to be close to 180°, the electromagnet 510 is powered on, the electromagnet 510 attracts the armature 509, drives the ratchet claw 508 to rotate against the elastic force of the reset spring 507, and is separated from the tooth groove of the ratchet wheel 505. The auxiliary rod 502 is turned out from the rectangular groove 501, the rotating shaft 504 rotates with the auxiliary rod 502, and the bottom of the auxiliary rod 502 contacts the supporting surface until the power of the electromagnet 510 is turned off. The reset spring 507 pushes the ratchet claw 508 to reset and clamps into the tooth groove of the ratchet wheel 505. The position of the auxiliary rod 502 is fixed, and the backrest 202 is stably kept at 180° in cooperation with the limiting assembly 4.

[0060] The backrest 202 is fully unfolded at 180° in cooperation with the limiting assembly 4, meeting the needs of students lying down to rest and other scenarios, and expanding the use function; the mechanical locking of the ratchet wheel 505 and the pawl 508 in combination with the support of the auxiliary rod 502 ensures the stability of the structure and strong load-bearing capacity at 180°.

[0061] Embodiment three

[0062] A method for using an ergonomic folding desk and chair, applied to the ergonomic folding desk and chair of claims 1-8, characterized by comprising the following steps:

[0063] S1: When reading is needed, the adjusting placement plate 303 can be adjusted to the adaptive state, and when adjusting, the adjusting placement plate 303 can be manually pulled out from the storage cavity 301 around the rotating shaft 302;

[0064] S2: Then the support plate 305 is turned out from the storage groove 304, and the end of the support plate 305 away from the storage groove 304 is clamped into the limiting groove 306 in the corresponding position;

[0065] S3: When the angle of the adjusting placement plate 303 needs to be adjusted, the support plate 305 is taken out and clamped into other limiting grooves 306, and when the LED light bar 307 needs to be used, the corresponding control switch is turned on;

[0066] S4: When the angle of the backrest 202 is adjusted, the pressing rod 406 on the outside of the chair seat 201 is pressed, the pressing rod 406 is kept in the pressed state, the driving bevel gear 407 is separated from the driven bevel gear 405, and the strong spring 408 is compressed, the backrest 202 is rotated to the target angle, the backrest 202 rotates the worm gear 404 through the rotating rod 403, the rotation of the worm gear 404 drives the worm 402 to rotate, when the appropriate position is reached, the pressing rod 406 is released, the driving bevel gear 407 is pushed to move by the elastic force of the strong spring 408, so that the driving bevel gear 407 and the driven bevel gear 405 are engaged, thereby limiting the worm 402;

[0067] S5: When the backrest 202 needs to be adjusted to 180°, the electromagnet 510 is powered on, after the electromagnet 510 is powered on, the electromagnet 510 is attracted to the armature 509, the pawl 508 is separated from the ratchet wheel 505, then the auxiliary rod 502 is manually turned out from the rectangular groove 501 until the bottom of the auxiliary rod 502 contacts the support surface;

[0068] S6: Then the electromagnet 510 is powered off, the pawl 508 is clamped into the ratchet wheel 505 by the elastic force of the reset spring 507, achieving limiting;

[0069] S7: When the components need to be stored, the reverse operation of steps 1-6 can be performed.

[0070] In summary, the ergonomic folding desk and chair and the use method thereof, by adjusting the multi-gear angle adjustment of the adjusting assembly 3, avoid students from bending down when reading, reduce neck muscle fatigue and cervical problems; the limiting assembly 4 and the fixing assembly 5 can flexibly adjust the angle of the backrest 202, adapt to the back support needs of different students, cooperate with the seat cushion 204 and the handrail 205, improve the long sitting comfort, reduce the risk of physical strain, conform to the ergonomic design, and effectively protect the health of students.

[0071] In addition, the adjusting placement plate 303 and the support plate 305 of the adjusting assembly 3 can be stored, saving space; the limiting assembly 4 realizes quick adjustment and locking of the angle of the backrest 202 through the pressing rod 406, and the fixing assembly 5 can stably keep the backrest 202 at 180°, meeting the needs of various scenes such as learning and resting, and the operation logic of each component is unified, facilitating students to use.

[0072] It should be noted that, in this document, the terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or equipment including the element.

[0073] Although the embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An ergonomic folding desk-chair comprising a desk (1) and a chair (2), characterized in that: The desk (1) includes a desk board (101) inside the desk (1) and desk legs (102) welded on both sides of the bottom of the desk board (101), the chair (2) includes a chair seat (201) inside the chair (2), one side of the chair seat (201) is rotatably installed with a backrest (202), the bottom of the chair seat (201) is welded with support legs (203) at four corners, the top of the chair seat (201) is placed with a cushion (204), and the top of the chair seat (201) is welded with armrests (205) on the left and right sides. The top of the desk board (101) is provided with an adjusting assembly (3), and the adjusting assembly (3) includes a receiving cavity (301) formed in the inside of the desk board (101), and a rotating shaft (302) is rotatably installed on the left and right inner walls of the receiving cavity (301), two adjusting placement plates (303) are fixedly installed between the two rotating shafts (302), two receiving grooves (304) are formed in the back of each adjusting placement plate (303), a supporting plate (305) is rotatably installed in each receiving groove (304), two groups of limiting grooves (306) are formed in the inside of the desk board (101) and located at the top of the receiving cavity (301), and an LED light bar (307) is attached to the surface of the desk board (101) and close to the upper end. A limiting assembly (4) is fixedly installed in the inside of the chair seat (201), the limiting assembly (4) includes a movable cavity (401) formed in the inside of the chair seat (201), a worm (402) is rotatably installed in the inside of the movable cavity (401) and located on both sides of the backrest (202), a rotating rod (403) is rotatably installed in the inside of the movable cavity (401) and located at the top of the worm (402), a worm gear (404) is fixedly installed on the surface of both ends of the rotating rod (403), a driven bevel gear (405) is fixedly installed on the left side of each worm (402), a pressing rod (406) is movably installed on the front and back sides of the chair seat (201) and extends into the inside of the movable cavity (401), a driving bevel gear (407) is fixedly installed on the surface of each pressing rod (406), and a strong spring (408) is fixedly installed on the opposite side of each driving bevel gear (407).

2. An ergonomic folding desk chair as claimed in claim 1, wherein: The inside of the backrest (202) is fixedly provided with a fixing assembly (5), the fixing assembly (5) comprises two rectangular grooves (501) formed on the back of the backrest (202), the inside of each of the two rectangular grooves (501) is rotatably provided with an auxiliary rod (502), the inside of the chair seat (201) and left and right sides of the two rectangular grooves (501) are both provided with a movable groove (503), the inside of each of the two auxiliary rods (502) and close to the upper end is fixedly provided with a rotating shaft (504), the surface of each of the two rotating shafts (504) and left and right sides of the auxiliary rod (502) are both fixedly provided with a ratchet wheel (505), the inner top wall of each of the two movable grooves (503) is fixedly provided with two vertical plates (506), the inner wall of each of the two groups of vertical plates (506) is fixedly provided with a reset spring (507), the surface of each of the two groups of vertical plates (506) is rotatably provided with a pawl (508), the surface of each of the two groups of pawls (508) is fixedly provided with an armature (509), and the inner wall of each of the two movable grooves (503) is fixedly provided with an electromagnet (510) close to the armature (509).

3. An ergonomically designed foldable desk chair as claimed in claim 2, wherein: The two groups of movable grooves (503) are arranged close to the top of the rectangular groove (501), the side, away from the vertical plate (506), of each of the two groups of reset springs (507) is fixedly connected with the inner wall of the pawl (508), and each of the two groups of pawls (508) is clamped into the tooth groove of the ratchet wheel (505).

4. An ergonomically designed foldable desk chair as claimed in claim 2, wherein: Each of the two auxiliary rods (502) is matched with the rectangular groove (501), the length of the two auxiliary rods (502) is on the same horizontal plane as the bottom of the supporting leg (203), and the two groups of electromagnets (510) are attracted to the armature (509).

5. The ergonomic folding desk chair of claim 1, wherein: Each of the two groups of limiting grooves (306) has five limiting grooves (306), each of the limiting grooves (306) is matched with the supporting plate (305), and the end, away from the receiving groove (304), of each of the two supporting plates (305) is clamped into the limiting groove (306).

6. The ergonomic folding desk chair of claim 1, wherein: The end of each of the two supporting plates (305) is rotatably connected with the inner wall of the receiving groove (304) through a movable shaft, and the size of each of the two supporting plates (305) is matched with the receiving cavity (301).

7. The ergonomic folding desk chair of claim 1, wherein: The surface of each of the left and right sides of the chair seat (201) is provided with a through hole matched with the pressing rod (406), and the side, away from each other, of the two pressing rods (406) extends to the outside of the chair seat (201) through the through hole; the side, opposite to each other, of each of the two strong springs (408) is fixedly connected with the inside of the movable cavity (401).

8. The ergonomic folding desk chair of claim 1, wherein: The surface of each of the two driving bevel gears (407) is meshed with the surface of the driven bevel gear (405), and the surface of each of the two worms (402) is meshed with the surface of the worm wheel (404); the surface of the rotating rod (403) is fixedly connected with one end of the backrest (202).

9. The method of using an ergonomic folding desk and chair, applied to the ergonomic folding desk and chair of claims 1-8, characterized in that: The method comprises the following steps: S1: when reading is needed, the adjusting placing plate (303) can be adjusted to an adaptive state, and when adjusting, the adjusting placing plate (303) can be manually pulled out of the receiving cavity (301) around the rotating shaft (302); S2: After the support plate (305) is turned out from the storage groove (304), the end of the support plate (305) is clamped into the limiting groove (306) in the corresponding position; S3: When the angle of the adjustment placement plate (303) needs to be adjusted, the support plate (305) is taken out and clamped into other limiting grooves (306). When the LED light bar (307) needs to be used, the corresponding control switch is turned on; S4: When the angle of the backrest (202) needs to be adjusted, the pressing rod (406) on the outside of the seat (201) is pressed, the pressing rod (406) is kept in the pressed state, the main and driven bevel gears (407) and (405) are separated, and the strong spring (408) is compressed. After the backrest (202) is turned to the target angle, the backrest (202) will drive the worm gear (404) to rotate through the rotating rod (403) when rotating. The rotation of the worm gear (404) drives the worm (402) to rotate. When it is rotated to the appropriate position, the pressing rod (406) is released, the driving bevel gear (407) is pushed by the elastic force of the strong spring (408), so that the driving bevel gear (407) and the driven bevel gear (405) are engaged, thereby limiting the worm (402); S5: When the backrest (202) needs to be adjusted to 180°, the electromagnet (510) is powered on. After the electromagnet (510) is powered on, the electromagnet (510) and the armature (509) are attracted, the pawl (508) and the ratchet wheel (505) are disengaged, and then the auxiliary rod (502) is manually turned out from the rectangular groove (501) until the bottom of the auxiliary rod (502) contacts the supporting surface; S6: Then the electromagnet (510) is powered off, and the pawl (508) is clamped into the ratchet wheel (505) by the elastic force of the reset spring (507), thereby limiting; S7: When the components need to be stored, the reverse operation of steps 1-6 can be performed.

Images