Swivel chair base with adjustable backward leaning force

Abstract

The utility model relates to the technical field of sample oil detection, in particular to a swivel chair base with adjustable backward leaning force, which comprises a fixed seat, a backrest connecting seat is hinged on the fixed seat, and the backrest connecting seat is connected with a plurality of tension springs and extends to be matched with an adjusting shaft on the fixed seat. A spring hanging piece correspondingly matched with the tension spring is arranged at the position of the adjusting shaft, and the spring hanging piece synchronously rotates along with the adjusting shaft to adjust the tension degree of the tension spring; an adjusting mechanism is further arranged on the adjusting shaft and used for driving the adjusting shaft to rotate. The adjusting mechanism is arranged and matched with the adjusting shaft to adjust the elongation of the tension spring, so that the tension force on the tension spring can be adjusted, the stress at the backrest connecting seat is adjusted, the supporting force at the back is finally changed, and the comfort degree of the seat backrest is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to sample oil detection technical field, concretely relates to a swivel chair base of adjustable back leaning force. BACKGROUND

[0002] Swivel chairs are widely used in daily life and work, and the swivel chair base is connected with the seat surface and the backrest to realize the pitch adjustment of the seat surface and the backrest, and the swivel chair base is connected with the lifting seat below to realize the overall lifting of the seat surface.

[0003] The existing swivel chair is provided with a spring mechanism in the swivel chair base to be tensioned, and a certain adjustment angle is maintained during the pitch adjustment of the seat surface and the backrest. However, after a certain period of use, the tensioning force of the spring mechanism of the seat surface and the backrest is weakened, the adjustment force is weakened during the pitch adjustment, the support force of the backrest of the swivel chair is affected, and when leaning back, the support force is insufficient to affect the sitting posture. After the support force decreases, the user's waist and back burden is also increased, which is easy to cause harm to the user. In order to prolong the service life of the spring mechanism as much as possible, a relatively strong elastic force is generally set in the initial stage, but this will cause the support force of the backrest to be too large in the early stage, and the comfort of the user is reduced.

[0004] It can be seen that the existing swivel chair base still needs to be improved, and the support force of the backrest of the swivel chair base should be adjusted to flexibly adjust the support force, maintain the reliability of the support force of the swivel chair, and prolong the service life of the swivel chair. Therefore, a more reasonable technical scheme is needed to solve the technical problems in the prior art. CONTENT OF THE UTILITY MODEL

[0005] In order to overcome at least one of the above-mentioned defects, the utility model provides a swivel chair base with adjustable back leaning force, which can flexibly change the force of the seat surface and the backrest during pitch adjustment by adjusting the spring mechanism inside the swivel chair base, thereby improving the convenience of adjusting the force of the swivel chair base and the flexibility of the adjustment operation.

[0006] In order to achieve the above-mentioned purpose, the swivel chair base disclosed by the utility model can adopt the following technical scheme:

[0007] A swivel chair base with adjustable back leaning force, comprising a fixed seat, a backrest connecting seat is hingedly arranged on the fixed seat, a plurality of tensioning springs are connected to the backrest connecting seat and extend to the adjusting shaft on the fixed seat, a spring hook corresponding to the tensioning spring is arranged at the adjusting shaft, and the spring hook rotates synchronously with the adjusting shaft to adjust the tension of the tensioning spring; an adjusting mechanism is further arranged at the adjusting shaft, and the adjusting mechanism drives the adjusting shaft to rotate.

[0008] The disclosed swivel chair base adjusts the tension of the adjusting spring by rotating the adjusting shaft through the adjusting mechanism, thereby adjusting the adjusting force of the backrest connecting seat. The backrest can maintain the supporting force on the back during use, and the comfort of the seat is maintained.

[0009] Further, the spring hanging piece rotates with the adjusting shaft, and various connection forms can be used, and the structure is not uniquely limited. Here, one of the feasible options is optimized and proposed: the spring hanging piece is sleeved on the adjusting shaft, and the spring hanging piece and the adjusting shaft are matched through the circumferential clamping structure. When the above scheme is used, the spring hanging piece is provided with a hook structure to cooperate with the spring; the circumferential clamping structure can include a key structure provided on the adjusting shaft and a groove structure provided on the spring hanging piece. After the spring hanging piece is slid into the adjusting shaft, the groove structure and the key structure are matched correspondingly to realize coaxial deflection.

[0010] Further, the adjusting mechanism is used to adjust the angle of the adjusting piece, so as to adjust the supporting force of the backrest, and the structure is not uniquely limited. Here, one of the feasible options is optimized and proposed: the adjusting mechanism includes an adjusting piece provided on the adjusting shaft, and the adjusting piece and the adjusting shaft are matched through the circumferential clamping structure and are used to drive the adjusting shaft to rotate; the adjusting piece is connected with an adjusting pull wire, and the adjusting pull wire is connected to an adjusting handle assembly. The adjusting handle assembly is used to tighten or loosen the adjusting pull wire to pull the adjusting piece to deflect, thereby driving the adjusting shaft to rotate. When the above scheme is used, the adjusting mechanism drives the adjusting pull wire to be tightened or loosened by shaking the adjusting handle assembly, thereby changing the supporting force of the backrest.

[0011] Further, the adjusting handle assembly can use various schemes, and the structure is not uniquely limited. Here, one of the feasible options is optimized and proposed: the adjusting handle assembly includes an adjusting cover, the adjusting cover is provided with a displacement adjusting part for connecting the adjusting pull wire, and is also provided with a rotation adjusting part matched with the displacement adjusting part and controlling the movement of the displacement adjusting part. The adjusting cover is also provided with a handle for driving the rotation adjusting part to rotate. When the above scheme is used, the rotation adjusting part rotates by rotating the handle, and the displacement adjusting part moves relatively at this time, and the displacement adjusting part synchronously drives the adjusting pull wire to be tightened or loosened.

[0012] In some schemes, the displacement adjusting part is cylindrical, and the outer side is provided with threads and is matched with the rotation adjusting part. When the rotation adjusting part rotates, the displacement adjusting part moves axially under the action of the thread cooperation, thereby tightening or loosening the adjusting pull wire.

[0013] Further, the adjustment pull wire needs to be reversed during actual extension, so as to improve the convenience of the traction adjustment piece, and various schemes can be adopted to achieve the purpose, and one feasible selection is optimized and proposed: the fixed seat is provided with a pull wire guide block, the pull wire guide block is provided with a guide groove, and the adjustment pull wire is wound from the guide groove to adjust the traction direction. When the above scheme is adopted, the pull wire guide block can be provided with a plurality of guide grooves, which are used to guide the adjustment pull wire of the adjustment force and other adjustment pull wires.

[0014] Further, in order to improve the stability and reliability of the back support force, the arrangement of the tension spring can adopt various schemes, and the structure is not uniquely limited, and one feasible selection is optimized and proposed: the number of the tension spring is several, and the tension spring is uniformly and interval arranged along the circumference of the adjustment shaft. When the above scheme is adopted, the tension spring is arranged symmetrically on both sides of the center point of the adjustment shaft.

[0015] Further, the cooperation between the backrest connecting seat and the adjustment spring can adopt various ways, and the structure is not uniquely limited, and one feasible selection is optimized and proposed: the backrest connecting seat is provided with a connecting shaft, one end of the tension spring is matched to the spring hanging piece, and the other end is matched to the connecting shaft. When the above scheme is adopted, the connecting shaft is rotationally connected with the backrest connecting seat, and in some schemes, the connecting shaft can also be fixedly connected.

[0016] Further, the adjustment shaft is hinged with a head plate, the head plate is hingedly connected with a movable seat, and the movable seat is also hingedly matched with the connecting shaft. When the backrest connecting seat is deflected, the movable seat is synchronously adjusted. When the above scheme is adopted, the adjustment of the movable seat can be realized through the synchronous linkage of the backrest connecting seat and the head plate, and the movable seat is used to connect and match the seat surface, so as to adjust the angle of the seat surface.

[0017] Further, when the swivel chair base is adjusted to recline, in addition to the elastic support scheme, a fixed angle support scheme can also be used, that is, the seat backrest is locked, which can be achieved in various ways, and the structure is not uniquely limited. Here is an optimized and feasible option: the swivel chair base further comprises a locking structure, the locking structure comprises an elastic lock tongue connected to one end of a torsion member and driven forward and backward by the torsion member, the other end of the torsion member is connected with a pitch adjustment handle and is deflected under the adjustment of the pitch adjustment handle, and the elastic lock tongue is further connected with a return spring which exerts a return force on the elastic lock tongue to keep it in the initial position; a plurality of locking ports matched with the elastic lock tongue are further arranged on the backrest connecting seat, and when the elastic lock tongue advances, it is clamped into the locking port and keeps the backrest at a corresponding inclination angle. When the elastic lock tongue retreats, it leaves the locking port and releases the angle locking of the backrest. When the above scheme is used, an arc-shaped locking edge is formed on the backrest connecting seat, and the locking ports are arranged on the locking edge.

[0018] Further, in actual application, the seat also involves lifting adjustment, and the specific adjustment method can be achieved in various schemes, and the structure is not uniquely limited. Here is an optimized and feasible option: the swivel chair base further comprises a lifting structure, the lifting structure comprises a lifting block arranged on the fixed seat, and the lifting block is used to control the lifting seat connected to the swivel chair base. When the lifting block is deflected and abuts with the lifting seat, the lifting structure further comprises a lifting adjustment handle used to adjust the lifting block, and the lifting adjustment handle is matched with the lifting block through a pull wire and pulls the lifting block to deflect. When the above scheme is used, the lifting seat is provided with a hydraulic structure or a pneumatic structure to realize lifting, and the lifting block is used to control the control valve of the hydraulic structure or the pneumatic structure, so as to realize lifting adjustment.

[0019] Compared with the prior art, some beneficial effects of the technical scheme disclosed in the utility model include:

[0020] By adjusting the extension amount of the tension spring through the adjusting mechanism matched with the adjusting shaft, the tension of the tension spring can be adjusted, the stress at the backrest connecting seat is adjusted, and finally the support force at the back is changed, so that the comfort of the seat backrest is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only represent some embodiments of the utility model, and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the premise of not paying creative labor.

[0022] Figure 1Figure 1 is a perspective view of the overall structure of the chair base from the top.

[0023] Figure 2 Figure 2 is a perspective view of the overall structure of the chair base from the bottom.

[0024] Figure 3 Figure 3 is a perspective view of the overall structure of the chair base from the top after removing the fixed seat and the movable seat.

[0025] Figure 4 Figure 4 is a perspective view of the overall structure of the chair base from the bottom after removing the fixed seat and the movable seat.

[0026] Figure 5 Figure 5 is a perspective view of the overall structure of the chair base from the side after removing the fixed seat and the movable seat.

[0027] Figure 6 Figure 6 is a perspective view of the overall structure of the chair base from the bottom after removing the fixed seat and the movable seat.

[0028] Figure 7 Figure 7 is a perspective view of the overall structure of the chair base from the bottom after removing the fixed seat and the movable seat.

[0029] Figure 8 Figure 8 is a perspective view of the overall structure of the chair base from the bottom after removing the fixed seat and the movable seat.

[0030] Figure 9 Figure 9 is a perspective view of the overall structure of the chair base from the bottom after removing the fixed seat and the movable seat.

[0031] Figure 10 Figure 10 is a perspective view of the overall structure of the chair base from the bottom after removing the fixed seat and the movable seat.

[0032] Figure 11 Figure 11 is a perspective view of the overall structure of the chair base from the bottom after removing the fixed seat and the movable seat.

[0033] Figure 12 Figure 12 is a perspective view of the overall structure of the chair base from the bottom after removing the fixed seat and the movable seat.

[0034] Figure 13 Figure 13 is a perspective view of the overall structure of the chair base from the bottom after removing the fixed seat and the movable seat.

[0035] Figure 14 Figure 14 is a perspective view of the overall structure of the chair base from the bottom after removing the fixed seat and the movable seat.

[0036] In the above figures, the meanings of the respective marks are as follows:

[0037] 1. Fixed seat; 2. Movable seat; 3. Adjusting shaft; 301. Key structure; 4. Spring hanger; 401. Groove structure; 402. Hook structure; 5. Tensioning spring; 6. Adjusting mechanism; 601. Adjusting cable; 602. Adjusting cover; 603. Handle; 604. Displacement adjusting component; 605. Rotation adjusting component; 7. Adjusting plate; 8. Locking structure; 801. Elastic locking tongue; 802. Torsion component; 803. Return spring; 804. Pitch adjusting block; 9. Lifting structure; 10. Headboard; 11. Backrest connecting seat; 1101. Locking port; 12. Connecting shaft; 13. Hinge shaft; 14. Lifting pressure block; 15. Cable guide block; 1501. Guide groove; 16. Sleeve assembly; 17. Balance spring; 1701. Buffer hook section; 1702. Hook structure. Detailed Implementation

[0038] The following description, in conjunction with the accompanying drawings and specific embodiments, further illustrates this embodiment.

[0039] In view of the fact that the existing swivel chair base cannot freely adjust the backrest support, the following embodiments optimize the existing technology and overcome the defects existing in the existing technology.

[0040] Example

[0041] like Figures 1-6 As shown, this embodiment provides a swivel chair base with adjustable reclining force, including a fixed base 1. A backrest connecting base 11 is hinged to the fixed base 1. The backrest connecting base 11 is connected to a plurality of tension springs 5 ​​and extends to an adjusting shaft 3 on the fixed base 1. A spring hanging plate 4 corresponding to the tension springs 5 ​​is provided at the adjusting shaft 3. The spring hanging plate 4 rotates synchronously with the adjusting shaft 3 to adjust the tension of the tension springs 5. An adjusting mechanism 6 is also provided at the adjusting shaft 3 to drive the adjusting shaft 3 to rotate.

[0042] Preferably, the backrest connecting seat 11 is connected to the fixed seat 1 via a hinge shaft 13.

[0043] The aforementioned swivel chair base uses an adjustment mechanism 6 to rotate the adjustment shaft 3, thereby changing the tension of the adjustment spring and adjusting the backrest connecting seat 11. This helps maintain the backrest's support during use, ensuring the chair's comfort.

[0044] The spring clip 4 rotates with the adjusting shaft 3, and various connection methods can be used. Its structure is not limited to a single type. This embodiment optimizes the design and adopts one feasible option: such as... Figure 11 , Figure 12As shown, the spring hanging piece 4 is sleeved on the adjusting shaft 3, and the spring hanging piece 4 is matched with the adjusting shaft 3 through the circumferential clamping structure. When the above scheme is adopted, the spring hanging piece 4 is provided with a hook structure 402 for cooperating with the spring; the circumferential clamping structure can include a key structure 301 provided on the adjusting shaft 3 and a groove structure 401 provided on the spring hanging piece 4 in correspondence, and after the spring hanging piece 4 is slid into the adjusting shaft 3, the groove structure 401 is matched with the key structure 301 in correspondence to realize coaxial deflection.

[0045] Preferably, as Figure 12 As shown, in some schemes, the key structure 301 and the groove structure 401 are arranged to connect and cooperate with the spring hanging piece 4, and in order to maintain the axial position of the spring hanging piece 4 on the adjusting shaft 3, a sleeve assembly 16 is further arranged on the adjusting shaft 3, and the sleeve assembly 16 is located between the adjacent spring hanging piece 4 and the adjusting piece 7 to perform axial positioning.

[0046] The adjusting mechanism 6 is used to adjust the angle of the adjusting piece 7, so as to adjust the support strength of the backrest, and the structure thereof is not uniquely limited, and the embodiment is optimized and one of the feasible choices is adopted: as Figures 7-9 As shown, the adjusting mechanism 6 includes the adjusting piece 7 arranged on the adjusting shaft 3, the adjusting piece 7 is matched with the adjusting shaft 3 through the circumferential clamping structure and is used to drive the adjusting shaft 3 to rotate; the adjusting piece 7 is connected with an adjusting pull wire 601, the adjusting pull wire 601 is extended and connected to an adjusting handle assembly, and the adjusting handle assembly is used to tighten or loosen the adjusting pull wire 601 to pull the adjusting piece 7 to deflect, thereby driving the adjusting shaft 3 to rotate. When the above scheme is adopted, the adjusting mechanism 6 changes the support strength of the backrest by shaking the adjusting handle assembly to tighten or loosen the adjusting pull wire 601.

[0047] The adjusting handle assembly can adopt various schemes, and the structure thereof is not uniquely limited, and the embodiment is optimized and one of the feasible choices is adopted: the adjusting handle assembly includes an adjusting cover 602, the adjusting cover 602 is provided with a displacement adjusting piece 604 for connecting the adjusting pull wire 601, and is further provided with a rotation adjusting piece 605 matched with the displacement adjusting piece 604 and controlling the movement of the displacement adjusting piece 604, and the adjusting cover 602 is further provided with a handle 603 for driving the rotation adjusting piece 605 to rotate. When the above scheme is adopted, the rotation adjusting piece 605 rotates by rotating the handle 603, and the displacement adjusting piece 604 moves relatively with the rotation adjusting piece 605 at this time, and the displacement adjusting piece 604 synchronously drives the adjusting pull wire 601 to tighten or loosen.

[0048] As Figure 9As shown in the drawings, in some schemes, the displacement adjusting member 604 is cylindrical, and the outer side is provided with threads and is in threaded cooperation with the rotation adjusting member 605. When the rotation adjusting member 605 rotates, the displacement adjusting member 604 moves axially under the action of the threaded cooperation, thereby driving the adjusting pull wire 601 to be tensioned or loosened.

[0049] The adjusting pull wire 601 needs to be reversed during actual extension, thereby improving the convenience of pulling the adjusting sheet 7. Various schemes can be adopted to achieve this purpose. The present embodiment is optimized and one of the feasible options is adopted as follows: Figure 10 As shown in the drawings, the fixed seat 1 is provided with a pull wire guide block 15, the pull wire guide block 15 is provided with a guide groove 1501, and the adjusting pull wire 601 is wound from the guide groove 1501 to adjust the pulling direction. When the above scheme is adopted, a plurality of guide grooves 1501 can be provided on the pull wire guide block 15, which can not only guide the adjusting pull wire 601 to adjust the adjusting force, but also guide other pull wires for adjustment.

[0050] In order to improve the stability and reliability of the back support force, various schemes can be adopted for the arrangement of the tension spring 5, and the structure is not uniquely limited. The present embodiment is optimized and one of the feasible options is adopted as follows: The number of the tension spring 5 is several, and the tension spring 5 is uniformly and interval arranged along the circumference of the adjusting shaft 3. When the above scheme is adopted, the tension spring 5 is symmetrically arranged on both sides of the center point of the adjusting shaft 3.

[0051] Preferably, as shown in Figure 1 , Figure 2 and Figure 4 In some schemes, in order to maintain the stability of the back during the reclining process, avoid the elastic force of the tension spring 5 being inconsistent or the position of the tension spring 5 being displaced, resulting in the instability of the back, the side tilting or side falling, a balance spring 17 is correspondingly arranged at the middle part of the adjusting shaft 3 and the connecting shaft 12. The two ends of the balance spring 17 are correspondingly matched with the adjusting shaft 3 and the connecting shaft 12, and are tensioned to provide elastic force when the back is reclined to a certain angle. One end of the balance spring 17 is provided with a buffer hook, the buffer hook includes a buffer hooking section 1701, and a hook structure 1702 is arranged at the end of the buffer hooking section 1701. The buffer hook is matched or connected with the adjusting shaft 3 or the connecting shaft 12. In normal state, the adjusting shaft 3 or the connecting shaft 12 is located in the buffer hooking section 1701 and moves relatively. When the back is reclined to a certain angle, the adjusting shaft 3 or the connecting shaft 12 moves to contact and cooperate with the hook structure 1702, so as to stretch the balance spring 17 to be elastically deformed, thereby helping to maintain the stability of the back.

[0052] The cooperation between the back connecting seat 11 and the adjusting spring can adopt various ways, and the structure is not uniquely limited. The present embodiment is optimized and one of the feasible options is adopted as follows: Figures 1-6、 Figure 14 As shown, the backrest connecting seat 11 is provided with a connecting shaft 12, one end of the tension spring is matched to the spring hanging piece 4, and the other end is matched to the connecting shaft 12. When the above scheme is adopted, the connecting shaft 12 is rotationally connected with the backrest connecting seat 11, and in some schemes, the connecting shaft 12 can also be fixedly connected.

[0053] The adjusting shaft 3 is hinged with a head plate 10, the head plate 10 is hingedly connected with a movable seat 2, and the movable seat 2 is also hingedly matched with the connecting shaft 12, and when the backrest connecting seat 11 is deflected, the movable seat 2 is synchronously adjusted. When the above scheme is adopted, the adjustment of the movable seat 2 can be realized through the synchronous linkage of the backrest connecting seat 11 and the head plate 10, and the movable seat 2 is used to connect and match the seat surface, thereby adjusting the angle of the seat surface.

[0054] When the swivel chair base is adjusted to be tilted backward, in addition to the scheme of adopting elastic support, a scheme of fixed-angle support can also be adopted, that is, the seat backrest is locked, which can be realized in various ways, and the structure is not uniquely limited. In this embodiment, one of the feasible options is optimized and adopted: the swivel chair base further comprises a locking structure 8, the locking structure 8 comprises an elastic lock tongue 801 connected to one end of a torsion member 802 and driven by the torsion member 802 to advance and retreat, the other end of the torsion member 802 is connected with a pitch adjustment handle and is deflected under the adjustment of the pitch adjustment handle, the elastic lock tongue 801 is further connected with a return spring 803, the return spring 803 applies a return force to the elastic lock tongue 801 to make it retreat to the initial position; the backrest connecting seat 11 is further provided with a plurality of locking openings 1101 matched with the elastic lock tongue 801, when the elastic lock tongue 801 advances, it is clamped into the locking opening 1101 and makes the backrest locked at the corresponding inclination angle, when the elastic lock tongue 801 retreats, it leaves the locking opening 1101 and releases the angle locking of the backrest. When the above scheme is adopted, an arc-shaped locking edge is formed on the backrest connecting seat 11, and the locking openings 1101 are arranged on the locking edge.

[0055] Preferably, as shown in some embodiments, the pitch adjustment handle is switched between the locking position and the unlocking position, and the pitch adjustment handle is further matched with the pitch adjustment block 804 to enable the pitch adjustment handle to be maintained at the locking position or the unlocking position. Figure 13

[0056] ​In the actual application process, the seat also relates to the lifting adjustment, and the specific adjustment mode can be realized through various schemes, and the structure is not uniquely limited. The embodiment is optimized and one of the feasible options is adopted: the swivel chair base further comprises a lifting structure 9, the lifting structure 9 comprises a lifting pressing block 14 arranged on the fixed seat 1, the lifting pressing block 14 is used to control the lifting seat connected to the swivel chair base, when the lifting block is deflected and abuts with the lifting seat, the lifting structure 9 further comprises a lifting adjustment handle used to adjust the lifting pressing block 14, the lifting adjustment handle is matched with the lifting pressing block 14 through a pull wire and pulls the lifting pressing block 14 to deflect. When the above scheme is adopted, the hydraulic structure or the pneumatic structure is arranged at the lifting seat to realize the lifting, and the lifting pressing block 14 is used to control the control valve of the hydraulic structure or the pneumatic structure, so as to realize the lifting adjustment.

[0057] The above is the embodiment listed in the embodiment, but the embodiment is not limited to the optional embodiment, and those skilled in the art can obtain other various embodiments by arbitrarily combining the above modes with each other. Any person can obtain other various forms of embodiments under the inspiration of the embodiment. The above specific embodiments should not be understood as a limitation on the protection scope of the embodiment, and the protection scope of the embodiment should be defined by the claims.

Claims

1. A swivel chair base with adjustable reclining force, characterized by: The fixed seat (1) is provided with a backrest connecting seat (11) hinged thereon, a plurality of tension springs (5) are connected to the backrest connecting seat (11) and extend to the adjusting shaft (3) on the fixed seat (1), the adjusting shaft (3) is provided with spring hanging pieces (4) corresponding to the tension springs (5), the spring hanging pieces (4) are synchronous with the adjusting shaft (3) to adjust the tension of the tension springs (5); the adjusting shaft (3) is further provided with an adjusting mechanism (6) for driving the adjusting shaft (3) to rotate.

2. The reclining- angle-adjustable swivel chair base according to claim 1, characterized by: The spring hanging piece (4) is sleeved on the adjusting shaft (3), and the spring hanging piece (4) and the adjusting shaft (3) are matched through the circumferential clamping structure.

3. The reclining- angle-adjustable swivel chair base according to claim 1, characterized by: The adjusting mechanism (6) comprises an adjusting piece (7) arranged on the adjusting shaft (3), the adjusting piece (7) is matched with the adjusting shaft (3) through the circumferential clamping structure and is used to drive the adjusting shaft (3) to rotate; the adjusting piece (7) is connected with an adjusting pull wire (601), the adjusting pull wire (601) is connected to an adjusting handle assembly, the adjusting handle assembly is used to tighten or loosen the adjusting pull wire (601) to pull the adjusting piece (7) to deflect, and then drive the adjusting shaft (3) to rotate.

4. The reclining- angle-adjustable swivel chair base according to claim 3, characterized by: The adjusting handle assembly comprises an adjusting cover body (602), the adjusting cover body (602) is provided with a displacement adjusting piece (604) for connecting the adjusting pull wire (601), and is further provided with a rotation adjusting piece (605) matched with the displacement adjusting piece (604) and controlling the movement of the displacement adjusting piece (604), and the adjusting cover body (602) is further provided with a handle (603) for driving the rotation adjusting piece (605) to rotate.

5. The reclining tension adjustable swivel chair base according to claim 3, wherein: The fixed seat (1) is provided with a pull wire guide block (15), the pull wire guide block (15) is provided with a guide groove (1501), and the adjusting pull wire (601) is wound from the guide groove (1501) to adjust the traction direction.

6. The reclining- angle-adjustable swivel chair base according to any one of claims 1 to 5, characterized in that: The number of the tension springs (5) is several, and the tension springs (5) are uniformly and interval arranged along the circumference of the adjusting shaft (3).

7. The reclining tilt chair base of claim 1, wherein: The backrest connecting seat (11) is provided with a connecting shaft (12), one end of the tension spring (5) is matched to the spring hanging piece (4), and the other end is matched to the connecting shaft (12).

8. The reclining tension adjustable swivel chair base according to claim 7, wherein: The adjusting shaft (3) is hinged with a head plate (10), the head plate (10) is hingedly connected with a movable seat (2), and the movable seat (2) is further hingedly matched with the connecting shaft (12), when the backrest connecting seat (11) deflects, the movable seat (2) is synchronously adjusted.

9. The reclining- angle adjustable swivel chair base according to claim 1, wherein: The swivel chair base further comprises a locking structure (8), the locking structure (8) comprises an elastic lock tongue (801), the elastic lock tongue (801) is connected to one end of a torsion piece (802) and is driven by the torsion piece (802) to advance and retreat, the other end of the torsion piece (802) is connected with a pitch adjusting handle and is deflected under the adjustment of the pitch adjusting handle, the elastic lock tongue (801) is further connected with a reset spring (803), the reset spring (803) applies a reset force to the elastic lock tongue (801) to make it retreat and keep in an initial position; a plurality of locking ports (1101) matched with the elastic lock tongue (801) are further arranged on the backrest connecting seat (11), when the elastic lock tongue (801) advances, it is clamped into the locking port (1101) and makes the backrest keep locked at a corresponding inclination angle, when the elastic lock tongue (801) retreats, it leaves the locking port (1101) and releases the angle locking of the backrest.

10. The reclining- angle-adjustable swivel chair base according to claim 1, characterized by: The swivel chair base further comprises a lifting structure (9), the lifting structure (9) comprises a lifting pressing block (14) arranged on the fixed seat (1), the lifting pressing block (14) is used to control a lifting seat connected to the swivel chair base, when the lifting block is deflected and abuts against the lifting seat, the lifting structure (9) further comprises a lifting adjusting handle used to adjust the lifting pressing block (14), the lifting adjusting handle is matched with the lifting pressing block (14) through a pull wire and pulls the lifting pressing block (14) to deflect.

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