Multifunctional learning chair

Abstract

The invention discloses a multifunctional learning chair, and relates to the field of chairs, the multifunctional learning chair comprises a keel frame, a headrest support adjusting mechanism is arranged above the keel frame, a forward leaning base is mounted at the bottom of the keel frame, a support column is arranged at the bottom of the forward leaning base, and a stabilizing seat is mounted at the bottom of the support column; a shoulder supporting mechanism A and a waist supporting mechanism A are installed on one side of the keel frame, and a shoulder supporting mechanism B and a waist supporting mechanism B are installed on the other side of the keel frame. A headrest cushion is arranged on the headrest supporting and adjusting mechanism, and a fixing piece is installed on the back face of the headrest cushion. According to the multifunctional learning chair, the shoulder supporting mechanism A, the shoulder supporting mechanism B, the waist supporting mechanism A and the waist supporting mechanism B symmetrically clamp the shoulders and the waist of a student from the two sides respectively, double fixing of the upper trunk of the student is formed, just like an invisible support is constructed for the body, and bad postures such as shoulder inner buckling, humpback and waist inclination can be accurately limited; the spine is guided to keep a natural upright state.

Description

Technical Field

[0001] The present invention relates to the field of seats, and specifically to a multifunctional study chair. Background Art

[0002] Traditional seats are designed to provide a significant level of comfort and adjustability; the seat typically provides a backward vertical recline of the seat and backrest relative to the chair base; the seat and backrest assembly is typically pushed into the normal position by springs, in which the seating surface is approximately horizontal or reclined backward at a small angle; in such a chair, the recline control mechanism typically connects the seat and backrest assembly so that they can recline backward together in response to the movement of the chair occupant; in addition, such a chair typically allows the backrest to also move relative to the seat during this backward recline, which is sometimes referred to as synchronous recline; chairs with such a structure are traditional and have been used in offices and other environments for many years; the chair has also evolved such that the seat can pivot effectively forward from the normal upright position; that is, the rear of the seat can move upward (or the front downward) so that it tilts downward in the forward direction, such that the rear of the seat is at a height higher than or flush with the front of the seat; it has been found that such a forward tilt feature on the seat is very desirable for individuals who like to sit on the front edge of the chair or for people in many more intensive work environments (such as when the chair occupant is working on a keyboard); however, if not properly supported, then the tilted posture may increase the ergonomic risk due to reduced support from the chair seat; in addition, including a forward tilt feature of the seat in a chair that also includes synchronous backward recline of the seat and backrest, in particular, has created complexity regarding the physical space for all the components required for these features on the chair seat / under the chair seat.

[0003] Regarding the patent of a student seat, after retrieval, the patent with the publication number CN110313743A discloses a forward tilt assembly for a chair seat. In the text, the forward tilt assembly includes a base, a seat plate, and a release mechanism; the seat plate is pivotally mounted to the base and includes two support brackets located on the side of the seat plate; each support bracket includes a keyhole slot; the release mechanism can operate between a locked position and an unlocked position and includes a slidable locking pin mounted between the support brackets; the release mechanism includes two keyed collars, one collar being provided at each end of the locking pin; the collars are received in the corresponding keyhole slots of the support brackets; when the release mechanism is in the unlocked position, the collars move unobstructed within the keyhole slots, and the seat plate can pivot relative to the base, thereby tilting the rear of the chair seat.

[0004] When the above-mentioned chair is in use, although it can lean forward to adapt to the user's body posture, in actual use, especially when students use it, the waist and shoulders of the students cannot be fixed, and the sitting posture of the students cannot be corrected. Students are prone to hunchback or body skew on the seat and it is difficult to maintain a correct sitting posture. Staying in such a bad posture for a long time will cause changes in the physiological curvature of the spine and increase the risk of diseases such as scoliosis, cervical spondylosis, and lumbar disc herniation. Summary of the Invention

[0005] The purpose of the present invention is to provide a multifunctional study chair to solve the defects mentioned in the above background technology.

[0006] To achieve the above object, a multifunctional study chair is provided, including a dragon bone frame. Above the dragon bone frame, there is a headrest support adjustment mechanism. At the bottom of the dragon bone frame, there is an inclined forward base. At the bottom of the inclined forward base, there is a support column. At the bottom of the support column, there is a stable base. On one side of the dragon bone frame, there are respectively installed a shoulder support mechanism A and a waist support mechanism A. On the other side of the dragon bone frame, there are respectively installed a shoulder support mechanism B and a waist support mechanism B. On the headrest support adjustment mechanism, there is a headrest pad. On the back of the headrest pad, there is a fixing piece. On the surface of the fixing piece, there is a horizontally adjustable frame fixedly arranged. The outside of the horizontally adjustable frame is sleeved with a horizontally accommodating frame. On the front of the dragon bone frame, there is a backrest pad. At the bottom of the dragon bone frame, there is a seat pad. At the bottom of the backrest pad, there is a receiving hole. Inside the receiving hole, there is a rear waist support.

[0007] Further, the stable base is made of metal and has an isosceles trapezoid structure at both ends. At the end of the stable base, there is a footrest, and the length of the footrest is equal to the width of the stable base.

[0008] Further, the headrest support adjustment mechanism includes a headrest pad, a fixing piece, a horizontally accommodating frame, a horizontally adjustable frame, adjustment holes A, a locking assembly, a vertically adjustable frame, adjustment holes B, and a vertically accommodating frame. The locking assembly is composed of a fixing bolt and a fixing nut. The fixing nut is installed on the upper surface of the horizontally accommodating frame. The surface of the horizontally adjustable frame is evenly provided with multiple groups of adjustment holes A. The horizontally adjustable frame is inserted into the horizontally accommodating frame and fixed by the locking assembly. The horizontal position of the headrest pad is adjusted by the horizontally accommodating frame and the horizontally adjustable frame. The vertical height of the headrest pad is adjusted by the vertically adjustable frame and the vertically accommodating frame.

[0009] Further, the end of the fixing bolt is screwed into the inside of the fixing nut. The end of the fixing bolt passes through the fixing nut and is inserted into the inside of the adjustment hole A. The distance between adjacent two groups of adjustment holes A is the same.

[0010] Furthermore, a vertical adjustment frame is fixedly installed at the bottom of the horizontal accommodation frame. A plurality of groups of adjustment holes B are evenly arranged on the vertical adjustment frame. The vertical adjustment frame passes through the vertical accommodation frame, and the vertical accommodation frame is fixedly connected to the top of the keel frame. The vertical adjustment frame is inserted into the interior of the vertical accommodation frame and fixed by a locking assembly.

[0011] Furthermore, a main support frame A is fixedly arranged on one side of the bottom of the keel frame, and a main support frame B is fixedly arranged on the other side of the bottom of the keel frame. A shoulder support mechanism A and a waist support mechanism A are respectively installed on the main support frame A, and a shoulder support mechanism B and a waist support mechanism B are respectively installed on the main support frame B.

[0012] Furthermore, the shoulder support mechanism A and the waist support mechanism A have the same composition structure, and the shoulder support mechanism B and the waist support mechanism B have the same composition structure. The shoulder support mechanism A and the shoulder support mechanism B are symmetric structures with respect to the central axis of the keel frame; the waist support mechanism A and the waist support mechanism B are symmetric structures with respect to the central axis of the keel frame. Shoulder pads are provided at the ends of the shoulder support mechanism A and the shoulder support mechanism B, and the two groups of shoulder pads are arranged opposite to each other; waist pads are provided at the ends of the waist support mechanism A and the waist support mechanism B, and the two groups of waist pads are arranged opposite to each other.

[0013] Furthermore, the shoulder support mechanism A includes an upper adjustment frame, a connecting column, a central frame, an insertion frame, adjustment holes C, an edge frame, a docking frame, a fixed seat, a hinge, and a shoulder pad; locking assemblies are installed on the upper adjustment frame, the central frame, and the edge frame. The main support frame A is inserted into the interior of the upper adjustment frame, and the upper adjustment frame is fixed on the main support frame A by a locking assembly; the position adjustment methods of the shoulder pad and the waist pad are the same. The position of the shoulder pad in the X-axis direction is adjusted by the edge frame and the docking frame, the position of the shoulder pad in the Y-axis direction is adjusted by the central frame and the insertion frame, and the position of the shoulder pad in the Z-axis direction is adjusted by the upper adjustment frame and the main support frame A.

[0014] Furthermore, a central frame is fixedly arranged at one end of the connecting column away from the upper adjustment frame. An insertion frame is inserted into the interior of the central frame, and the insertion frame is fixed in the interior of the central frame by a locking assembly. A plurality of groups of adjustment holes C are evenly arranged on the insertion frame, and an edge frame is fixedly arranged at one end of the insertion frame away from the connecting column.

[0015] Furthermore, a docking frame is inserted into the interior of the edge frame, and the docking frame is fixed in the interior of the edge frame by a locking assembly. A fixed seat is installed at the end of the docking frame, and a shoulder pad is installed at the top of the fixed seat through a hinge.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. In the present invention, both sides of the student's shoulders are clamped and fixed respectively by the shoulder support mechanism A and the shoulder support mechanism B, and both sides of the student's waist are clamped and fixed respectively by the waist support mechanism A and the waist support mechanism B. This seat can correct the sitting posture and bones of the student. The shoulder support mechanism A, the shoulder support mechanism B, the waist support mechanism A and the waist support mechanism B symmetrically clamp the student's shoulders and waist from both sides respectively, forming a double fixation of the upper torso of the student, just like building an invisible bracket for the body, which can accurately limit bad postures such as shoulder hunching, hunchback and waist skew, and guide the spine to maintain a natural upright state;

[0018] 2. The shoulder support mechanism A, the shoulder support mechanism B, the waist support mechanism A and the waist support mechanism B in the present invention share the longitudinal pressure of the upper body, avoiding excessive stress on a single part, such as the waist; through mechanical dispersion, it reduces the load of the muscles continuously exerting force to maintain the sitting posture, especially suitable for students who study for a long time, and can reduce the risks of shoulder and neck soreness and lumbar muscle strain; the symmetrical clamping forces on both sides of the shoulders and waist can correct bone dislocation caused by long-term bad sitting postures, such as scoliosis and uneven shoulders; for teenagers in the development period, this kind of "passive correction" can assist the bones to grow in the correct direction and reduce the risk of structural deformities;

[0019] 3. The shoulder support mechanism A and the shoulder support mechanism B in the present invention can indirectly limit the student's head from protruding forward for "neck poking", and cooperate with the waist support to make the head, neck and chest in the same vertical axis, reducing problems such as abnormal vision adjustment, neck wrinkles and straightening of the cervical curvature caused by the forward tilt of the cervical vertebra; the shoulder pads on the shoulder support mechanism A and the shoulder support mechanism B and the waist pads on the waist support mechanism A and the waist support mechanism B can be adjusted in position to adapt to students of different heights and body types. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is the front view schematic diagram of the structure of the present invention;

[0021] Figure 2 is the side view of the structure of the present invention;

[0022] Figure 3 is the rear view of the structure of the present invention;

[0023] Figure 4 is the top view of the structure of the present invention;

[0024] Figure 5 is the schematic diagram of the structure of the shoulder support mechanism A of the present invention;

[0025] Figure 6 is the structure of the present invention Figure 5 side view;

[0026] Figure 7 is the structure of the present inventionFigure 5 Bottom elevation view.

[0027] Reference numerals

[0028] 1. Keel frame; 11. Main support frame A; 12. Main support frame B; 2. Back cushion; 3. Seat cushion; 4. Forward tilt base; 5. Support column; 6. Stabilizing base; 61. Footrest; 7. Headrest support adjustment mechanism; 70. Headrest cushion; 71. Fixed plate; 72. Horizontal receiving frame; 73. Fixed bolt; 74. Fixed nut; 75. Horizontal adjustment frame; 76. Adjustment hole A; 77. Locking assembly; 78. Vertical adjustment frame; 780. Adjustment hole B; 79. Vertical receiving frame; 8. Shoulder support mechanism A; 80. Upper adjustment frame; 81. Connecting column; 82. Central frame; 83. Interpenetrating frame; 84. Adjustment hole C; 85. Edge frame; 86. Docking frame; 87. Fixed seat; 88. Hinge; 89. Shoulder cushion; 800. Shoulder support mechanism B; 9. Lumbar support mechanism A; 90. Lumbar cushion; 901. Rear lumbar support; 900. Lumbar support mechanism B. Detailed implementation manners

[0029] Detailed implementation manner 1: Please refer to Figures 1-7 , the present invention provides a technical solution: a multifunctional learning chair, including a keel frame 1, a headrest support adjustment mechanism 7 is arranged above the keel frame 1, a forward tilt base 4 is installed at the bottom of the keel frame 1, a support column 5 is arranged at the bottom of the forward tilt base 4, a stabilizing base 6 is installed at the bottom of the support column 5, a shoulder support mechanism A 8 and a lumbar support mechanism A 9 are respectively installed on one side of the keel frame 1, and a shoulder support mechanism B 800 and a lumbar support mechanism B 900 are respectively installed on the other side of the keel frame 1; a headrest cushion 70 is arranged on the headrest support adjustment mechanism 7, a fixed plate 71 is installed on the back surface of the headrest cushion 70, a horizontal adjustment frame 75 is fixedly arranged on the surface of the fixed plate 71, and a horizontal receiving frame 72 is sleeved outside the horizontal adjustment frame 75; a back cushion 2 is installed on the front surface of the keel frame 1, and a seat cushion 3 is installed at the bottom of the keel frame 1; a receiving hole is opened at the bottom of the back cushion 2, and a rear lumbar support 901 is installed inside the receiving hole.

[0030] Working principle: When students use this seat, they sit on the seat cushion 3 with their backs against the back cushion 2. The two sides of the students' shoulders are respectively clamped and fixed by the shoulder support mechanism A8 and the shoulder support mechanism B800, and the two sides of the students' waists are respectively clamped and fixed by the waist support mechanism A9 and the waist support mechanism B900. This seat can correct the sitting postures and bones of students. The shoulder support mechanism A8, the shoulder support mechanism B800, the waist support mechanism A9, and the waist support mechanism B900 symmetrically clamp the shoulders and waists of students from both sides respectively, forming a double fixation of the upper trunk of students, just like building an invisible bracket for the body, which can accurately limit bad postures such as shoulder internal rotation, hunchback, and waist skew, and guide the spine to maintain a natural upright state; when studying at a desk for a long time, the shoulder support can prevent the scapula from protruding forward caused by chest collapse, and the waist support can offset the trend of lumbar kyphosis, so that the spine maintains a normal physiological curvature; the seat cushion 3 bears the weight of the buttocks and thighs, the back cushion 2 supports the thoracic vertebrae and lumbar vertebrae, and the shoulder support mechanism A8, the shoulder support mechanism B800, the waist support mechanism A9, and the waist support mechanism B900 share the longitudinal pressure of the upper body, avoiding excessive stress on a single part, such as the waist; through mechanical dispersion, the load of muscles continuously exerting force to maintain the sitting posture is reduced, which is especially suitable for students who study for a long time, and can reduce the risks of shoulder and neck soreness and lumbar muscle strain; the symmetrical clamping forces on both sides of the shoulders and waists can correct bone misalignments caused by long-term bad sitting postures, such as scoliosis and uneven shoulders; for teenagers in the development stage, this kind of "passive correction" can assist the bones to grow in the correct direction and reduce the risk of structural deformities; when the body is stable through the shoulder and waist support mechanisms of this seat, students do not need to frequently adjust their sitting postures and can concentrate on learning tasks; at the same time, the correct sitting posture can improve the thoracic cavity volume, enhance the breathing efficiency, indirectly supply oxygen to the brain, and enhance concentration;

[0031] The shoulder support mechanism A8 and the shoulder support mechanism B800 can indirectly limit the students' heads from protruding forward for "neck stretching". Cooperating with the waist support, the head, neck, and chest are on the same vertical axis, reducing problems such as abnormal vision adjustment, neck wrinkles, and straightening of the cervical curvature caused by cervical vertebra anterior inclination; the shoulder pads 89 on the shoulder support mechanism A8 and the shoulder support mechanism B800 and the waist pads 90 on the waist support mechanism A9 and the waist support mechanism B900 can be adjusted in position to adapt to students of different heights and body types, avoiding affecting the comfort or correction effect due to being fixed too tightly or too loosely; the back cushion 2, the seat cushion 3, the shoulder pads 89, and the waist pads 90 are made of breathable sponge, elastic fabric and other materials, which can reduce friction and compression while fixing the body, and are suitable for long-term use; this seat realizes precise intervention in sitting postures and scientific guidance for bone development through the design logic of multi-point support, symmetrical clamping, and mechanical dispersion, which is especially suitable for the student group with heavy schoolwork and still-developing bones; by cultivating the habit of correct sitting posture imperceptibly through daily use, long-term use can significantly reduce the occurrence risk of spinal and musculoskeletal system diseases, and at the same time provide a physical support basis for efficient learning;

[0032] The adjustment methods of the shoulder support mechanism A8, the waist support mechanism A9, the shoulder support mechanism B800, and the waist support mechanism B900 are the same. Here, only the adjustment method of the shoulder support mechanism A8 will be described: The X-axis position of the shoulder pad 89 is adjusted through the edge frame 85 and the docking frame 86. The Y-axis position of the shoulder pad 89 is adjusted through the center frame 82 and the insertion frame 83. The Z-axis position of the shoulder pad 89 is adjusted through the upper adjustment frame 80 and the main support frame A11. After the positions between the upper adjustment frame 80 and the main support frame A11 are adjusted, they are fixed by the locking component 77. After the positions between the center frame 82 and the insertion frame 83 are adjusted, they are fixed by the locking component 77. After the positions between the edge frame 85 and the docking frame 86 are adjusted, they are fixed by the locking component 77; realizing three-dimensional adjustment of the position of the shoulder pad 89. At the same time, the lateral position of the headrest pad 70 is adjusted through the horizontal receiving frame 72 and the horizontal adjustment frame 75, and the vertical height of the headrest pad 70 is adjusted through the vertical adjustment frame 78 and the vertical receiving frame 79, adapting to the needs of students with different heights and body types through the above methods.

[0033] Specific Embodiment 2: This embodiment is a further limitation of Specific Embodiment 1. The stable seat 6 is made of metal and has an isosceles trapezoid structure at both ends. A footrest 61 is installed at the end of the stable seat 6, and the length of the footrest 61 is equal to the width of the stable seat 6.

[0034] Specific Embodiment 3: This embodiment is a further limitation of Specific Embodiment 1. The headrest support adjustment mechanism 7 includes a headrest pad 70, a fixing piece 71, a horizontal receiving frame 72, a horizontal adjustment frame 75, adjustment holes A76, a locking component 77, a vertical adjustment frame 78, adjustment holes B780, and a vertical receiving frame 79; The locking component 77 consists of a fixing bolt 73 and a fixing nut 74. The fixing nut 74 is installed on the upper surface of the horizontal receiving frame 72. Multiple groups of adjustment holes A76 are evenly opened on the surface of the horizontal adjustment frame 75. The horizontal adjustment frame 75 is inserted into the internal of the horizontal receiving frame 72 and fixed by the locking component 77; The lateral position of the headrest pad 70 is adjusted through the horizontal receiving frame 72 and the horizontal adjustment frame 75, and the vertical height of the headrest pad 70 is adjusted through the vertical adjustment frame 78 and the vertical receiving frame 79.

[0035] Specific Embodiment 4: This embodiment is a further limitation of Specific Embodiment 3. The end of the fixing bolt 73 is screwed into the internal of the fixing nut 74. The end of the fixing bolt 73 passes through the fixing nut 74 and is inserted into the internal of the adjustment hole A76. The distance between adjacent two groups of adjustment holes A76 is the same.

[0036] A movable circular force-bearing ring can be installed at the end of the fixing nut 74 to facilitate the force-bearing rotation of the fixing nut 74.

[0037] Embodiment 5: This embodiment is a further limitation of Embodiment 3. A vertical adjustment frame 78 is fixedly installed at the bottom of the horizontal accommodation frame 72. A plurality of groups of adjustment holes B780 are evenly formed in the vertical adjustment frame 78. The vertical adjustment frame 78 passes through the vertical accommodation frame 79. The vertical accommodation frame 79 is fixedly connected to the top of the keel frame 1. The vertical adjustment frame 78 is inserted into the interior of the vertical accommodation frame 79 and fixed by a locking assembly 77.

[0038] Embodiment 6: This embodiment is a further limitation of Embodiment 1. A main support frame A11 is fixedly arranged on one side of the bottom of the keel frame 1, and a main support frame B12 is fixedly arranged on the other side of the bottom of the keel frame 1. A shoulder support mechanism A8 and a waist support mechanism A9 are respectively installed on the main support frame A11, and a shoulder support mechanism B800 and a waist support mechanism B900 are respectively installed on the main support frame B12.

[0039] Embodiment 7: This embodiment is a further limitation of Embodiment 6. The shoulder support mechanism A8 and the waist support mechanism A9 have the same composition structure, and the shoulder support mechanism B800 and the waist support mechanism B900 have the same composition structure. The shoulder support mechanism A8 and the shoulder support mechanism B800 are symmetrical structures with respect to the central axis of the keel frame 1; the waist support mechanism A9 and the waist support mechanism B900 are symmetrical structures with respect to the central axis of the keel frame 1. Shoulder pads 89 are provided at the ends of the shoulder support mechanism A8 and the shoulder support mechanism B800, and the two groups of shoulder pads 89 are arranged oppositely; waist pads 90 are provided at the ends of the waist support mechanism A9 and the waist support mechanism B900, and the two groups of waist pads 90 are arranged oppositely.

[0040] Embodiment 8: This embodiment is a further limitation of Embodiment 7. The shoulder support mechanism A8 includes an upper adjustment frame 80, a connecting column 81, a central frame 82, an insertion frame 83, adjustment holes C84, an edge frame 85, a docking frame 86, a fixed seat 87, a hinge 88, and a shoulder pad 89; Locking assemblies 77 are installed on the upper adjustment frame 80, the central frame 82, and the edge frame 85. The main support frame A11 is inserted into the interior of the upper adjustment frame 80, and the upper adjustment frame 80 is fixed on the main support frame A11 by the locking assembly 77; The position adjustment methods of the shoulder pad 89 and the waist pad 90 are the same. The position of the shoulder pad 89 in the X-axis direction is adjusted by the edge frame 85 and the docking frame 86, the position of the shoulder pad 89 in the Y-axis direction is adjusted by the central frame 82 and the insertion frame 83, and the position of the shoulder pad 89 in the Z-axis direction is adjusted by the upper adjustment frame 80 and the main support frame A11.

[0041] Specific Embodiment IX: This embodiment is a further limitation of Specific Embodiment VIII. One end of the connecting column 81 away from the upper adjustment frame 80 is fixedly provided with a central frame 82. An insertion frame 83 is inserted inside the central frame 82. The insertion frame 83 is fixed inside the central frame 82 through a locking assembly 77. A plurality of groups of adjustment holes C84 are evenly formed on the insertion frame 83. One end of the insertion frame 83 away from the connecting column 81 is fixedly provided with an edge frame 85.

[0042] Specific Embodiment X: This embodiment is a further limitation of Specific Embodiment I. A docking frame 86 is inserted inside the edge frame 85. The docking frame 86 is fixed inside the edge frame 85 through a locking assembly 77. A fixed seat 87 is installed at the end of the docking frame 86. A shoulder pad 89 is installed on the top of the fixed seat 87 through a hinge 88.

[0043] The lumbar support 901 can be horizontally adjusted inside the accommodation hole at the bottom of the backrest 2, so as to adjust the lumbar support strength for students in this way. At the same time, the horizontal movement adjustment method of the lumbar support 901 is the same as that of the headrest pad 70, which will not be elaborated here; a seat forward tilt mechanism can be installed inside the forward tilt base 4. The specific structure of this seat forward tilt mechanism can refer to the comparative document (publication number: CN110313743A) of a forward tilt assembly of a chair seat disclosed in the background art, which belongs to the non-essential technical feature content of this case.

Claims

1. A multi-functional learning chair, comprising a dragon skeleton (1), characterized in that: Above the said keel frame (1), there is a headrest support adjustment mechanism (7). At the bottom of the keel frame (1), there is a forward-tilting base (4). At the bottom of the forward-tilting base (4), there is a support column (5). At the bottom of the support column (5), there is a stabilizing base (6). On one side of the keel frame (1), there are respectively installed a shoulder support mechanism A (8) and a waist support mechanism A (9). On the other side of the keel frame (1), there are respectively installed a shoulder support mechanism B (800) and a waist support mechanism B (900); on the headrest support adjustment mechanism (7), there is a headrest cushion (70). On the back of the headrest cushion (70), there is a fixing piece (71). On the surface of the fixing piece (71), there is a horizontally adjusting frame (75) fixedly arranged. The outside of the horizontally adjusting frame (75) is sleeved with a horizontally accommodating frame (72); on the front of the keel frame (1), there is a backrest cushion (2). At the bottom of the keel frame (1), there is a seat cushion (3); at the bottom of the backrest cushion (2), there is a receiving hole, and inside the receiving hole, there is a rear waist support (901).

2. The multifunctional learning chair according to claim 1, wherein: The said stabilizing base (6) is made of metal and has a structure with both ends being isosceles trapezoids. At the end of the stabilizing base (6), there is a footrest (61), and the length of the footrest (61) is equal to the width of the stabilizing base (6).

3. A multifunctional learning chair according to claim 1, characterized in that: The said headrest support adjustment mechanism (7) includes a headrest cushion (70), a fixing piece (71), a horizontally accommodating frame (72), a horizontally adjusting frame (75), adjusting holes A (76), a locking component (77), a vertically adjusting frame (78), adjusting holes B (780), and a vertically accommodating frame (79); the locking component (77) consists of two parts: a fixing bolt (73) and a fixing nut (74). The fixing nut (74) is installed on the upper surface of the horizontally accommodating frame (72). On the surface of the horizontally adjusting frame (75), there are evenly arranged multiple groups of adjusting holes A (76). The horizontally adjusting frame (75) is inserted into the inside of the horizontally accommodating frame (72) and fixed by the locking component (77); the horizontal position of the headrest cushion (70) is adjusted by the horizontally accommodating frame (72) and the horizontally adjusting frame (75), and the vertical height of the headrest cushion (70) is adjusted by the vertically adjusting frame (78) and the vertically accommodating frame (79).

4. The multifunctional learning chair according to claim 3, wherein: The end of the said fixing bolt (73) is screwed into the inside of the fixing nut (74). The end of the fixing bolt (73) passes through the fixing nut (74) and is inserted into the inside of the adjusting hole A (76). The distance between adjacent two groups of adjusting holes A (76) is the same.

5. The multifunctional learning chair according to claim 3, wherein: At the bottom of the said horizontally accommodating frame (72), there is a vertically adjusting frame (78) fixedly installed. On the vertically adjusting frame (78), there are evenly arranged multiple groups of adjusting holes B (780). The vertically adjusting frame (78) passes through the vertically accommodating frame (79). The vertically accommodating frame (79) is fixedly connected to the top of the keel frame (1). The vertically adjusting frame (78) is inserted into the inside of the vertically accommodating frame (79) and fixed by the locking component (77).

6. A multifunctional learning chair according to claim 1, characterized in that: On one side of the bottom of the keel frame (1), a main support frame A (11) is fixedly arranged, and on the other side of the bottom of the keel frame (1), a main support frame B (12) is fixedly arranged. A shoulder support mechanism A (8) and a waist support mechanism A (9) are respectively installed on the main support frame A (11), and a shoulder support mechanism B (800) and a waist support mechanism B (900) are respectively installed on the main support frame B (12).

7. A multifunctional learning chair according to claim 6, characterized in that: The shoulder support mechanism A (8) and the waist support mechanism A (9) have the same composition structure, the shoulder support mechanism B (800) and the waist support mechanism B (900) have the same composition structure. The shoulder support mechanism A (8) and the shoulder support mechanism B (800) are symmetric structures with respect to the central axis of the keel frame (1); the waist support mechanism A (9) and the waist support mechanism B (900) are symmetric structures with respect to the central axis of the keel frame (1). Shoulder pads (89) are provided at the ends of the shoulder support mechanism A (8) and the shoulder support mechanism B (800), and the two sets of shoulder pads (89) are arranged opposite to each other; waist pads (90) are provided at the ends of the waist support mechanism A (9) and the waist support mechanism B (900), and the two sets of waist pads (90) are arranged opposite to each other.

8. A multifunctional learning chair according to claim 7, characterized in that: The shoulder support mechanism A (8) includes an upper adjustment frame (80), a connecting column (81), a central frame (82), an insertion frame (83), an adjustment hole C (84), an edge frame (85), a docking frame (86), a fixed seat (87), a hinge (88) and a shoulder pad (89); locking components (77) are installed on the upper adjustment frame (80), the central frame (82) and the edge frame (85). The main support frame A (11) is inserted into the interior of the upper adjustment frame (80), and the upper adjustment frame (80) is fixed on the main support frame A (11) through the locking component (77); the position adjustment methods of the shoulder pad (89) and the waist pad (90) are the same. The position of the shoulder pad (89) in the X-axis direction is adjusted through the edge frame (85) and the docking frame (86), the position of the shoulder pad (89) in the Y-axis direction is adjusted through the central frame (82) and the insertion frame (83), and the position of the shoulder pad (89) in the Z-axis direction is adjusted through the upper adjustment frame (80) and the main support frame A (11).

9. A multifunctional learning chair according to claim 8, characterized in that: One end of the connecting column (81) far away from the upper adjustment frame (80) is fixedly provided with a central frame (82). The insertion frame (83) is inserted into the interior of the central frame (82), and the insertion frame (83) is fixed in the interior of the central frame (82) through the locking component (77). A plurality of groups of adjustment holes C (84) are evenly arranged on the insertion frame (83), and one end of the insertion frame (83) far away from the connecting column (81) is fixedly provided with an edge frame (85).

10. A multi-functional learning chair according to claim 9, characterized in that: The docking frame (86) is inserted into the interior of the edge frame (85), and the docking frame (86) is fixed in the interior of the edge frame (85) through the locking component (77). A fixed seat (87) is installed at the end of the docking frame (86), and a shoulder pad (89) is installed on the top of the fixed seat (87) through a hinge (88).

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