CN113068930A

CN113068930A - Chair for students

Info

Publication number: CN113068930A
Application number: CN202110414981.4A
Authority: CN
Inventors: 丁风秋
Original assignee: Individual
Current assignee: Greenlink System Furniture Co ltd
Priority date: 2021-04-17
Filing date: 2021-04-17
Publication date: 2021-07-06
Anticipated expiration: 2041-04-17
Also published as: CN113068930B

Abstract

The invention discloses a chair for students, which relates to the field of chairs and comprises: the backrest structure and the fixing mechanism are arranged, the backrest structure is pushed to move to drive the fixing mechanism to fix the backrest, the hook is attached to the outer wall of one end of the table to limit the chair and the table, and the backrest is accommodated and limited to move on the table when the table is placed on the table, so that the backrest is stressed and cannot fall off; the telescopic wheel mechanism is used to make the movement easier and more labor-saving under the condition of moving, and the use is not influenced; the transmission mechanism and the rotating mechanism realize that the stop block rotates to support and keep balance when the student leans back on the front leg to be emptied, thereby increasing the safety degree and reducing the occurrence of accidents.

Description

Chair for students

Technical Field

The invention relates to the field of chairs, in particular to a chair for students.

Background

The chair is a daily-life furniture, is a seat with a backrest and armrests, has strong practicability, can be found in each room, and has the main function of facilitating people to have a rest; the chair is indispensable in school, the daily life is a family-school with two points and one line for students, the classroom of the school is the longest time for the students except the sleeping time, and the practicability and safety of the chair for the students are extremely important because the students sit on the chair for study all day long.

When a student cleans the desk, the student can place the chair upside down on the desk, the backrest of the chair is placed downwards, the backrest is in a vertically downward state to form a barrier to cleaning, so that the student needs to bend down or squat to clean the lower part of the desk, and when the lower part of the desk is cleaned, the student is easy to touch the chair and simultaneously stressed to displace the chair, and the chair falls off the desk to damage the chair; when students use the chair, part of students like sitting on the chair and leaning backwards, only the back legs of the chair touch the ground, and once losing balance, the chair can topple over to cause danger; when a school holds large-scale activities, a whole school student is required to take a chair to go to a playground for participation, but the common chair for students is inconvenient to carry, and if wheels are directly arranged below the chair, the carrying is convenient, but the use of a classroom is influenced.

According to the problems, the invention provides a chair for students, which can limit the chair back while accommodating the chair back and prevent the chair back from falling when the chair is placed on a table upside down, can block and limit the inclination angle when the students lean backwards, can increase the safety, and can reduce the carrying difficulty and simultaneously can not influence the normal use when the students need to carry the chair.

Disclosure of Invention

The invention aims to: in order to solve the student and to fall down the chair on the desk when cleaning the health after class, the chair back is placed downwards, the back is in perpendicular decurrent state, can make the student need bow or squat the formula and clean the desk below, and when cleaning, touch the chair easily, the displacement takes place easily for the chair atress, fall down from the desk, cause the damage to the chair, need have the structure to accomodate the back of chair, and it is spacing to chair and desk, prevent that the chair from falling down from the desk easily, it leans on backward on the chair to like to some students, only the chair back leg lands, in case lose balance, the chair is emptyd easily, the student falls down along with the chair, can cause dangerous problem to the student, and provide the chair that a student used on the transport problem of chair.

In order to achieve the purpose, the invention provides the following technical scheme: a chair for students comprising: main part, back structure, the main part includes: seat, preceding leg and back leg, main part up end rear side is provided with the back structure, its characterized in that still includes: run through the transmission device who establishes in seat and back leg, transmission device includes: the device comprises a fixed block, a rotating shaft, a stop block, a connecting groove, a movable plate, a second spring, a connecting block, a push plate, a compression chamber, a connecting pipe, a pushing groove and a piston; the upper surface of the seat plate is provided with a connecting groove, the interior of the seat plate is provided with a compression chamber, the compression chamber is positioned below the connecting groove, a movable plate is arranged in the connecting groove in a sliding mode up and down, and the connecting groove is connected with the movable plate through a second spring; the compression chamber is internally provided with a push plate which is connected with the compression chamber in a sliding manner, the movable plate is fixedly connected with the push plate through a connecting block, the rear leg is internally provided with a connecting pipe which penetrates through the upper end of the rear leg and is communicated with the compression chamber, the pushing groove is communicated with the lower end of the connecting pipe in the rear leg, the piston is connected with the piston in the pushing groove in a sliding manner, the rear leg is internally provided with a rotating mechanism which is fixedly connected with the lower end face of the piston, the lower part of the rear side of the rear leg is fixedly connected with a fixed block, the inside of the fixed block is; the fixed block is rotatably connected with a stop dog through a rotating shaft.

As a further scheme of the invention: the rotating mechanism includes: the device comprises a screw rod, a first gear, a second gear, a connecting column, a third gear, a fourth gear, a rotating column and a rotating disc; piston lower surface and lead screw upper end fixed connection, the cover is equipped with a gear rather than threaded connection on the lead screw, a gear is connected with No. two gear rotations, spliced pole both ends are No. two gears of fixedly connected with, No. three gears respectively, No. three gears with rotate the post and be connected rather than four gears of fixed connection, rotate post both ends and rolling disc fixed connection, the tooth's socket meshing that sets up in rolling disc and the axis of rotation.

As a further scheme of the invention: the backrest structure includes: the backrest comprises a movable frame, a rotating groove, a connecting rod, a backrest, a sliding groove, a sliding block, a limiting groove and a limiting plate; the utility model discloses a seat, including seat, connecting rod, adjustable shelf, connecting rod, movable shelf, connecting rod, the connecting rod upper end is equipped with rather than fixed connection's back, the adjustable shelf rotates with the connecting rod through rotating the groove and is connected, spout and spacing groove have been seted up to the seat rear end, the adjustable shelf front end is equipped with the slider, the upper end is equipped with the limiting plate, the adjustable shelf passes through slider, limiting plate and spout, spacing groove matching and seat swing joint.

As a further scheme of the invention: the seat below is equipped with the fixed establishment with back structure swing joint, fixed establishment includes: the clamping groove, the displacement frame, the clamping block and the first spring are arranged on the clamping groove; the utility model discloses a seat back structure, including seat, back, displacement frame, back upper end, the back upper end is equipped with the draw-in groove, the displacement groove has been seted up to the seat lower surface, a spring is located the displacement inslot portion, a spring both ends respectively with displacement groove, displacement frame fixed connection, displacement frame and displacement groove sliding connection, the one end rotation connection that the back structure was kept away from to the displacement frame has the fixture block, draw-in groove and fixture block cooperation.

As a further scheme of the invention: preceding leg and back leg lower extreme all are equipped with the running wheel mechanism, the running wheel mechanism includes: a first rack, a transmission gear, a second rack, a first return spring, a roller and a second return spring; the first rack is fixedly connected with the lower end of the screw rod, the left end and the right end of the transmission gear are respectively meshed with the first rack and the second rack, a sliding groove is formed in the inner wall below the rear leg, the first reset spring is arranged in the sliding groove, the two ends of the first reset spring are respectively fixedly connected with the top end of the second rack and the inner wall of the sliding groove, the upper end of the second rack is connected with the rear leg in the sliding groove in a sliding mode, and the lower end of the second rack is provided with a roller; a second reset spring fixedly connected with the front leg is arranged in the front leg, and a roller is arranged at the lower end of the second reset spring.

As a further scheme of the invention: the connecting groove is of an inverted convex shape.

As a further scheme of the invention: the rear side of the movable frame is fixedly connected with a hook.

As a further scheme of the invention: one end of the displacement frame close to the movable frame is an inclined plane.

Compared with the prior art, the invention has the beneficial effects that:

(1) the invention realizes the storage of the backrest and the limitation of the movement of the invention on the table when the invention is placed on the table through the matching motion among the mechanisms, so that the invention is not dropped under stress; the telescopic wheel mechanism is used to make the movement easier and more labor-saving under the condition of moving, and the use is not influenced; when the student leans back on the front leg to be empty, the stop block rotates to support and keeps balance, so that the safety degree is increased, and accidents are reduced;

(2) according to the backrest fixing device, the backrest structure and the fixing mechanism are arranged, the backrest is pushed to move to drive the connecting rod to rotate, the connecting rod rotates to drive the movable frame to move until the backrest is attached to the seat plate, the movable frame drives the clamping block to move in the moving process, the clamping block is pushed to move into the clamping groove after the displacement of the backrest is stopped, and the clamping block fixes the backrest; when the chair needs to be placed on the desktop upside down, the inner wall of the hook is attached to the outer wall of one end of the desk, the chair and the desk are limited, the chair and the desk are prevented from falling under stress, and articles can be hung on the hook when the chair is used, so that the backrest of the chair can be conveniently stored when the chair is not used;

(3) according to the chair, the transmission mechanism and the rotating mechanism are arranged, a student sits on the seat plate, the movable plate is displaced by utilizing the self gravity, the gear is driven to rotate by utilizing the transmission of the inert gas, so that the stop block is driven to rotate, the stop block rotates to be in contact with the ground, the student is prevented from leaning backwards, the safety coefficient of the chair for the student is increased, and accidents are reduced;

(4) according to the invention, when the telescopic wheel mechanism is used for sitting down, the telescopic wheel mechanism is retracted, and when the device needs to be transported, the telescopic wheel mechanism is protruded without force application, so that the device is convenient to transport and move.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic view of the backrest structure of the present invention.

Fig. 3 is a schematic view of the fixing mechanism of the present invention.

Fig. 4 is a schematic view of the connection relationship between the fixing mechanism and the backrest structure of the present invention.

Fig. 5 is a schematic view of a backrest structure according to the present invention in a storage state.

Fig. 6 is a cross-sectional view of the overall structure of the present invention.

Fig. 7 is an enlarged view of fig. 6A.

Fig. 8 is a diagram showing the connection relationship between the rotary disk and the rotary shaft according to the present invention.

Fig. 9 is a partial enlarged view of fig. 6B.

Fig. 10 is a partial enlarged view of fig. 6C.

Fig. 11 is a schematic view of the connection of the gear and rack of the present invention.

In the figure: 1-a body; 101-seat plate; 102-front legs; 103-rear leg; 2-a backrest structure; 201-a movable frame; 202-a rotating groove; 203-connecting rod; 204-backrest; 205-a chute; 206-a slider; 207-a limit groove; 208-a limiting plate; 209-hook; 3-a fixing mechanism; 301-card slot; 302-displacement groove; 303-displacement frame; 304-a fixture block; 305-spring number one; 4-a transfer mechanism; 401-fixed block; 402-a rotating shaft; 403-a stopper; 404-connecting grooves; 405-a movable plate; 406-spring No. two; 407-connecting block; 408-push plate; 409-a compression chamber; 410-connecting pipe; 411-push slot; 412-a piston; 5-a rotating mechanism; 503-a screw rod; 504-gear number one; 505-gear No. two; 506-connecting column; 507-third gear; 508-gear four; 509-rotating column; 510-a rotating disc; 6-a telescopic wheel mechanism; 601-rack I; 602-a transmission gear; 603-second rack; 604-return spring number one; 605-a roller; 606-number two return spring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The following describes an embodiment of the present invention based on its overall structure.

An embodiment of the present invention, as shown in fig. 1 to 11, is a chair for students, including: main part 1, back structure 2, main part 1 includes: seat 101, front leg 102 and back leg 103, the back side of main part 1 up end is provided with back structure 2, the invention also includes: a transmission mechanism 4 penetrating and provided in the seat plate 101 and the rear leg 103, the transmission mechanism 4 including: the device comprises a fixing block 401, a rotating shaft 402, a stop 403, a connecting groove 404, a movable plate 405, a second spring 406, a connecting block 407, a push plate 408, a compression chamber 409, a connecting pipe 410, a pushing groove 411 and a piston 412; the upper surface of the seat plate 101 is provided with a connecting groove 404, the interior of the seat plate is provided with a compression chamber 409, the compression chamber 409 is positioned below the connecting groove 404, a movable plate 405 is arranged in the connecting groove 404 in a sliding manner up and down, and the connecting groove 404 is connected with the movable plate 405 through a second spring 406; a push plate 408 connected with the compression chamber 409 in a sliding manner is arranged in the compression chamber 409, the movable plate 405 is fixedly connected with the push plate 408 through a connecting block 407, a connecting pipe 410 penetrating through the upper end of the rear leg 103 and communicated with the compression chamber 409 is arranged in the rear leg 103, the lower end of the pushing groove 411 is communicated with the lower end of the connecting pipe 410 in the rear leg 103, the piston 412 is connected with the piston in the pushing groove 411 in a sliding manner, a rotating mechanism 5 fixedly connected with the lower end face of the piston 412 is arranged in the rear leg 103, a fixed block 401 is fixedly connected to the lower part of the rear side of the rear leg 103, a rotating shaft; the fixing block 401 is rotatably connected with the stopper 403 through a rotating shaft 402;

the design realizes that when the student chair is required to be placed on a desk, the backrest structure 2 is pushed to be accommodated and placed on the desk, so that the blocking of the backrest is reduced during cleaning, and the foundation is stable and is not easy to fall off; when sitting on the seat plate 101 and leaning back, the stopper 403 makes the seat plate turn and support and limit the inclination angle of the chair through the matching movement of the transmission mechanism 4 and the rotating mechanism 5; the safety factor of the student chair is increased, and accidents are reduced.

In the embodiment of the present invention, as shown in fig. 6 and 8, the rotating mechanism 5 includes: the device comprises a lead screw 503, a first gear 504, a second gear 505, a connecting column 506, a third gear 507, a fourth gear 508, a rotating column 509 and a rotating disc 510; the lower surface of the piston 412 is fixedly connected with the upper end of a screw rod 503, a first gear 504 in threaded connection with the screw rod 503 is sleeved on the screw rod 503, the first gear 504 is rotatably connected with a second gear 505, two ends of a connecting column 506 are respectively and fixedly connected with the second gear 505 and a third gear 506, the third gear 506 is rotatably connected with a fourth gear 508 which is arranged on a rotating column 509 and is fixedly connected with the rotating column 509, two ends of the rotating column 509 are fixedly connected with a rotating disc 510, and the rotating disc 510 is meshed with a tooth groove arranged on a rotating shaft 402;

this embodiment has realized when the student sits on seat 101, and the action of gravity makes gaseous transmission, utilizes gaseous transmission to drive lead screw 503 and gear revolve among the slewing mechanism 5 to make dog 403 overturn and ground contact, lean on backward to block the student.

In the embodiment of the present invention, as shown in fig. 2 to 4, the backrest structure 2 includes: the movable frame 201, the rotating groove 202, the connecting rod 203, the backrest 204, the sliding groove 205, the sliding block 206, the limiting groove 207 and the limiting plate 208; the upper end of the connecting rod 203 is provided with a backrest 204 fixedly connected with the connecting rod 203, the movable frame 201 is rotatably connected with the connecting rod 203 through the rotating groove 202, the rear end of the seat plate 101 is provided with a sliding groove 205 and a limiting groove 207, the front end of the movable frame 201 is provided with a sliding block 206, the upper end of the movable frame 201 is provided with a limiting plate 208, and the movable frame 201 is movably connected with the seat plate 101 through the matching of the sliding block 206, the limiting plate 208, the sliding groove 205 and the limiting;

the seat 101 below is equipped with the fixed establishment 3 with back structure 2 swing joint, and fixed establishment 3 includes: a clamping groove 301, a displacement groove 302, a displacement frame 303, a clamping block 304 and a first spring 305; a clamping groove 301 is formed in the upper end of the backrest 204, a displacement groove 302 is formed in the lower surface of the seat plate 101, the first spring 305 is located inside the displacement groove 302, two ends of the first spring 305 are fixedly connected with the displacement groove 302 and the displacement frame 303 respectively, the displacement frame 303 is connected with the displacement groove 302 in a sliding mode, a clamping block 304 is rotatably connected to one end, away from the backrest structure 2, of the displacement frame 303, and the clamping groove 301 is matched with the clamping block 304;

according to the embodiment, the backrest 204 is pushed to move to drive the connecting rod 203 to rotate, the connecting rod 203 rotates to drive the movable frame 201 to move until the backrest 204 is attached to the seat plate 101, the fixture block 304 is driven to move in the moving process of the movable frame 201, the fixture block 304 is pushed to move into the clamping groove 301 after the movement of the backrest 204 is stopped, and the fixture block 304 fixes the backrest 204; the invention can be placed on a table top to prevent falling under stress.

In the embodiment of the present invention, as shown in fig. 9 to 11, the lower ends of the front leg 102 and the rear leg 103 are respectively provided with a rotating wheel mechanism 6, and the rotating wheel mechanism 6 includes: a first rack 601, a transmission gear 602, a second rack 603, a first return spring 604, a roller 605 and a second return spring 606; the first rack 601 is fixedly connected with the lower end of the lead screw 503, the left end and the right end of the transmission gear 602 are respectively meshed with the first rack 601 and the second rack 603, a sliding groove is formed in the inner wall below the rear leg 103, the first return spring 604 is arranged in the sliding groove, the two ends of the first return spring are respectively fixedly connected with the top end of the second rack 603 and the inner wall of the sliding groove, the upper end of the second rack 603 is slidably connected with the rear leg 103 in the sliding groove, and the lower end of the second rack 603 is provided with a roller 605; a second return spring 606 fixedly connected with the front leg 102 is arranged in the front leg 102, and a roller 605 is arranged at the lower end of the second return spring 606;

this embodiment has realized through telescopic wheel mechanism 6 when sitting down, telescopic wheel mechanism 6 retraction, and when needs were carried, the telescopic wheel mechanism 6 of effect of no power was outstanding makes foreleg 102 and back leg 103 lower extreme liftoff, has realized that the transport of convenience of installation removes and makes the removal light laborsaving, and can not exert an influence to the use.

In the embodiment of the present invention, as shown in fig. 1, the connecting groove 404 is an inverted convex shape; the rear side of the movable frame 201 is fixedly connected with a hook 209;

the design of the connecting groove 404 as an inverted convex shape in this embodiment increases the capacity of the compression chamber 409; the hook 209 is in sliding connection with one end of the desktop in a matching way, so that the chair is limited, and when the chair is put down for use, articles can be stored.

In the embodiment of the present invention, as shown in fig. 3, one end of the displacement frame 303 close to the movable frame 201 is an inclined plane;

when the backrest structure 2 is pushed to move, the movable frame 201 is lifted to push the displacement frame 303 to move through the inclined plane design.

The working principle of the invention is as follows:

when the backrest 204 is stored, the backrest 204 is pushed, the backrest 204 is displaced to drive the connecting rod 203 to rotate, due to the limiting function of the sliding groove 205, the sliding block 206, the limiting groove 207 and the limiting plate 208, the connecting rod 203 drives the movable frame 201 to move upwards until the backrest 204 is attached to the seat plate 101, the movable frame 201 is contacted with the inclined plane of the displacement frame 303 in the displacement process, and the force is applied to the back end of the displacement frame 303 through the inclined surface of the back end of the displacement frame 303, so that the displacement frame 303 moves transversely away from the movable frame 201, the displacement frame 303 displaces to drive the clamping block 304 to displace, after the displacement of the backrest 204 stops, the fixture block 304 is pushed to move to the front end of the seat plate 101, the fixture block 304 is rotated to enable the fixture block 304 to be matched with the clamping groove 301, the fixture block 304 fixes the backrest 204, the chair is placed on the table upside down, the hook 209 is attached to one end of the table, so that the chair is limited with the table, and the chair is prevented from falling due to collision;

when the chair needs to be taken down for use, the fixture block 304 is pushed until the fixture block 304 is displaced out of the fixture groove 301, the displacement frame 303 slides towards the direction close to the movable frame 201 under the action of the elastic force of the first spring 305, the backrest 204 is pushed, the backrest 204 is displaced to drive the connecting rod 203 to rotate, the connecting rod 203 rotates to the rear end of the rotating groove 202 to stop, the movable frame 201 is forced to move downwards, the slide block 206, the limiting plate 208, the sliding groove 205 and the limiting groove 207 are matched to limit the backrest structure 2, and the hook 209 can hang articles when the chair is used;

when a student sits on the seat plate 101, the gravity of the student acts on the movable plate 405 to move the movable plate downwards, the movable plate 405 moves to drive the push plate 408 to move downwards through the connecting block 407, the push plate 408 presses the gas in the compression chamber 409 downwards to enter the push groove 411 through the connecting pipe 410, the gas pushes the piston 412 to move downwards, the piston 412 moves to drive the lead screw 503 to move downwards and drive the first gear 504 to rotate, the first gear 504 rotates to drive the second gear 505 to rotate, the second gear 505 rotates to drive the connecting column 506 to rotate, the connecting column 506 rotates to drive the third gear 507 to rotate, the third gear 507 rotates to drive the fourth gear 508 to rotate, the fourth gear 508 rotates to drive the rotating column 509 to rotate, the rotating column 509 rotates to drive the rotating disc 510 to rotate, the rotating disc 510 rotates to drive the rotating shaft 402 to rotate, the rotating shaft 402 rotates to drive the stopper 403 to turn, the stop block 403 is turned over to contact with the ground to stop the student leaning backwards;

in the sitting process of a student, the screw rod 503 drives the first rack 601 to move downwards, the first rack 601 moves downwards to drive the transmission gear 602 to rotate, at the moment, the transmission gear 602 rotates to drive the second rack 603 to move upwards, the second rack 603 drives the roller 605 to move upwards until the roller 605 is completely retracted into the rear leg 103, the second reset spring 606 is stressed to contract, and at the moment, the bottom ends of the front leg 102 and the rear leg 103 are grounded;

after the user leaves the device, due to the reset of the screw rod 503, the first rack 601 moves upwards along with the screw rod 503, at the moment, the transmission gear 602 rotates reversely, and simultaneously, in cooperation with the reset of the first reset spring 604, the group of rollers 605 is driven to move downwards, the grounding of the roller 605 of the rear leg is realized, meanwhile, the second reset spring 606 in the front leg 102 resets to expose the roller 605, at the moment, the bottom ends of the front leg 102 and the rear leg 103 are lifted off, and the device is convenient to carry when participating in large-scale activities of schools.

Claims

1. A chair for students comprising: main part (1), back structure (2), main part (1) includes: seat (101), preceding leg (102) and back leg (103), main part (1) up end rear side is provided with back structure (2), its characterized in that still includes: a transmission mechanism (4) provided through the seat (101) and the rear leg (103), the transmission mechanism (4) comprising: the device comprises a fixing block (401), a rotating shaft (402), a stop block (403), a connecting groove (404), a movable plate (405), a second spring (406), a connecting block (407), a push plate (408), a compression chamber (409), a connecting pipe (410), a pushing groove (411) and a piston (412); the upper surface of the seat plate (101) is provided with a connecting groove (404), the interior of the seat plate is provided with a compression chamber (409), the compression chamber (409) is positioned below the connecting groove (404), a movable plate (405) is arranged in the connecting groove (404) in a vertically sliding mode, and the connecting groove (404) is connected with the movable plate (405) through a second spring (406); a push plate (408) in sliding connection with the compression chamber (409) is arranged in the compression chamber (409), the movable plate (405) is fixedly connected with the push plate (408) through a connecting block (407), a connecting pipe (410) penetrating through the upper end of the rear leg (103) and communicated with the compression chamber (409) is arranged in the rear leg (103), the pushing groove (411) is communicated with the lower end of the connecting pipe (410) in the rear leg (103), the piston (412) is in sliding connection with the pushing groove (411) in the pushing groove, a rotating mechanism (5) fixedly connected with the lower end face of the piston (412) is arranged in the rear leg (103), a fixed block (401) is fixedly connected below the rear side of the rear leg (103), a rotating shaft (402) is arranged in the fixed block (401), and the output end of the rotating mechanism (5) is matched with the; the fixed block (401) is rotatably connected with a stop block (403) through a rotating shaft (402).

2. A chair for students according to claim 1, characterized in that the rotating mechanism (5) comprises: the gear mechanism comprises a screw rod (503), a first gear (504), a second gear (505), a connecting column (506), a third gear (507), a fourth gear (508), a rotating column (509) and a rotating disc (510); piston (412) lower surface and lead screw (503) upper end fixed connection, the cover is equipped with a gear (504) rather than threaded connection on lead screw (503), a gear (504) rotates with No. two gears (505) and is connected, spliced pole (506) both ends difference fixedly connected with No. two gears (505), No. three gear (506) with rotate on post (509) and rather than fixed connection's No. four gears (508) rotate and be connected, rotate post (509) both ends and rolling disc (510) fixed connection, the tooth's socket meshing that sets up on rolling disc (510) and axis of rotation (402).

3. A chair for students according to claim 1, characterized in that the backrest structure (2) comprises: the backrest chair comprises a movable frame (201), a rotating groove (202), a connecting rod (203), a backrest (204), a sliding groove (205), a sliding block (206), a limiting groove (207) and a limiting plate (208); connecting rod (203) upper end is equipped with rather than fixed connection's back (204), adjustable shelf (201) rotate with connecting rod (203) through rotating groove (202) and be connected, spout (205) and spacing groove (207) have been seted up to seat (101) rear end, adjustable shelf (201) front end is equipped with slider (206), upper end is equipped with limiting plate (208), adjustable shelf (201) are through slider (206), limiting plate (208) and spout (205), spacing groove (207) matching and seat (101) swing joint.

4. A chair for students according to claim 3, characterized in that a fixing mechanism (3) movably connected with the backrest structure (2) is arranged under the seat plate (101), and the fixing mechanism (3) comprises: the device comprises a clamping groove (301), a displacement groove (302), a displacement frame (303), a clamping block (304) and a first spring (305); backrest (204) upper end is equipped with draw-in groove (301), displacement groove (302) have been seted up to seat (101) lower surface, spring (305) are located displacement groove (302) inside, spring (305) both ends respectively with displacement groove (302), displacement frame (303) and displacement groove (302) sliding connection, the one end rotation that backrest structure (2) were kept away from in displacement frame (303) is connected with fixture block (304), draw-in groove (301) and fixture block (304) cooperation.

5. A chair for students according to claim 2, wherein the lower ends of the front leg (102) and the rear leg (103) are provided with a rotating wheel mechanism (6), and the rotating wheel mechanism (6) comprises: a first rack (601), a transmission gear (602), a second rack (603), a first return spring (604), a roller (605) and a second return spring (606); the first rack (601) is fixedly connected with the lower end of a lead screw (503), the left end and the right end of the transmission gear (602) are respectively meshed with the first rack (601) and the second rack (603), a sliding groove is formed in the inner wall below the rear leg (103), the first reset spring (604) is arranged in the sliding groove, two ends of the first reset spring are respectively fixedly connected with the top end of the second rack (603) and the inner wall of the sliding groove, the upper end of the second rack (603) is slidably connected with the rear leg (103) in the sliding groove, and a roller (605) is arranged at the lower end of the second rack (603); a second return spring (606) fixedly connected with the front leg (102) is arranged in the front leg (102), and a roller (605) is arranged at the lower end of the second return spring (606).

6. A chair for students according to claim 1, wherein the connecting groove (404) is of an inverse convex shape.

7. A chair for students according to claim 3, characterized in that a hook (209) is fixedly connected to the rear side of the movable frame (201).

8. A chair for students according to claim 4, wherein the end of the displacement frame (303) near the movable frame (201) is a slope.