A rebound force adjustment mechanism and a camera gimbal

Abstract

This invention discloses a rebound force adjustment mechanism and a camera tripod. The rebound force adjustment mechanism includes: a fixed base with a receiving cavity; a rotating base rotatably mounted on the fixed base; multiple torsion elastic elements located within the receiving cavity, each having a fixed end and a movable end, the fixed end of the torsion elastic element being fixedly connected to one of the fixed base and the rotating base; and a rotary clutch mechanism rotatably mounted on the fixed base or the rotating base, capable of driving the movable end of the torsion elastic element to engage or disengage with the other of the fixed base and the rotating base. The camera tripod includes the aforementioned rebound force adjustment mechanism. When it is necessary to adjust the rebound force acting on the rotating base, rotating the rotary clutch mechanism can drive different torsion elastic elements or different numbers of torsion elastic elements connected between the fixed base and the rotating base, facilitating user adjustment. Furthermore, since all torsion elastic elements are built into the fixed base, this simplifies the structure of the camera tripod and improves the overall structural compactness.

Description

Technical Field

[0001] This invention relates to the field of photographic equipment technology, and in particular to a spring force adjustment mechanism and a photographic gimbal. Background Technology

[0002] In video shooting, camera tripods are frequently used to mount cameras. To achieve multi-angle shooting, a typical camera tripod includes a fixed base and a movable base that rotates relative to the fixed base. To allow for resetting after focusing on the left / right or up / down position of the subject, a typical camera tripod includes a spring-loaded structure between the movable and fixed bases to drive the movable base to rotate and reset. However, different users have different requirements for the rebound force provided by this spring-loaded structure; therefore, rebound force adjustment mechanisms have emerged in related technologies.

[0003] However, current rebound force adjustment mechanisms are generally protruding from the side of the fixed base. They are combined or separated from multiple hooks and multiple spring components that can provide rotational torque to achieve the adjustment of the rebound force. This rebound force adjustment mechanism has problems such as very complex structure, inconvenient adjustment operation, easy to be accidentally touched during use leading to abnormal operation, and resulting in a large overall size of the camera head. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of the present invention is to provide a spring force adjustment mechanism with a compact structure and convenient adjustment operation.

[0005] According to a first aspect of the present invention, a rebound force adjusting mechanism includes: a fixed base having a receiving cavity; a rotating base rotatably disposed on the fixed base; a plurality of torsion elastic elements located within the receiving cavity, each torsion elastic element having a fixed end and a movable end, the fixed end of the torsion elastic element being fixedly connected to one of the fixed base and the rotating base; and a rotary clutch mechanism rotatably disposed on the fixed base or the rotating base, capable of driving the movable end of the torsion elastic element to engage or disengage with the other of the fixed base and the rotating base.

[0006] The spring force adjustment mechanism according to embodiments of the present invention has at least the following beneficial effects:

[0007] When the rebound force adjustment mechanism needs to adjust the rebound force acting on the rotating seat, the rotary clutch mechanism can drive different torque elastic elements or different numbers of torque elastic elements to be connected between the fixed seat and the rotating seat. The rebound force received by the rotating seat when it rotates can be adjusted by rotating the clutch. The torque elastic elements are all built into the fixed seat. The overall layout of the rebound force adjustment mechanism is compact and the adjustment operation is convenient.

[0008] In some embodiments of the present invention, the fixed base includes a cylindrical shell, the rotating base is rotatably disposed at the end of the cylindrical shell about the axis of the cylindrical shell, the rotary clutch mechanism includes a knob rotatably disposed on the rotating base and located at one end of the cylindrical shell, a plurality of clutches corresponding one-to-one with the torsion elastic elements are movably disposed on the rotating base, the fixed end of the torsion elastic element is disposed on the inner wall of the cylindrical shell, and when the knob is rotated, it can drive the clutch to move and connect to the movable end of the corresponding torsion elastic element.

[0009] In some embodiments of the present invention, the torsional elastic element includes an annular rubber sheet built into the cylindrical shell, a plurality of annular rubber sheets are spaced apart along the length direction of the cylindrical shell, the outer periphery of the annular rubber sheet is fixedly installed on the inner peripheral wall of the cylindrical shell, the rotating seat has a rotating shaft portion that movably passes through the inner periphery of the annular rubber sheet, the clutch is telescopically arranged along the length direction of the rotating shaft portion, the knob is provided with a driving surface structure that abuts against the clutch, the clutch is connected to a spring member that drives it to abut against the driving surface structure, the clutch is provided with a clutch block protruding from the outer peripheral wall of the rotating shaft portion, and the inner periphery of the annular rubber sheet is provided with a engagement groove that cooperates with the corresponding clutch block.

[0010] In some embodiments of the present invention, the drive surface structure includes a plurality of bosses distributed circumferentially around the rotation axis of the knob, with a groove between two adjacent bosses and a transition slope between adjacent bosses and grooves. The number of bosses, grooves, and clutches is the same. In the rotation direction of the knob, the boss and the groove behind it correspond to one clutch. When the knob rotates, the clutches can successively leave the bosses and enter the corresponding grooves so that the clutch block engages with the corresponding engagement groove, thereby connecting the corresponding annular rubber sheet between the rotating seat and the fixed seat.

[0011] In some embodiments of the present invention, in the rotation direction of the knob, the area of ​​the boss portion that can contact the corresponding clutch portion gradually increases, and the area of ​​the groove portion that can contact the corresponding clutch portion gradually decreases.

[0012] In some embodiments of the present invention, the rotating shaft portion has multiple channels circumferentially distributed around its axis, the outer peripheral wall of the rotating shaft portion is provided with a movable opening groove that communicates with the channels to allow the clutch block to extend, the clutch member is a rod that passes through the channels to move telescopically, and the spring member is located between the end of the rod away from the driving surface structure and the rotating shaft portion.

[0013] In some embodiments of the present invention, a corner positioning mechanism is provided between the knob and the rotating base.

[0014] In some embodiments of the present invention, the corner positioning mechanism includes a plurality of positioning grooves circumferentially distributed around the rotation axis of the knob and elastic positioning pins that match the positioning grooves. One of the positioning grooves and the elastic positioning pins is disposed on the end face of the rotating seat, and the other is disposed on the end face of the knob facing the rotating seat.

[0015] In some embodiments of the present invention, the end face of the knob facing the rotating base is provided with an arc-shaped guide groove arranged around the rotation axis of the knob, and the end face of the rotating base is provided with a guide post that matches the arc-shaped guide groove.

[0016] According to a second aspect of the present invention, a photographic gimbal includes the rebound force adjustment mechanism of any of the above-described technical solutions.

[0017] The camera gimbal according to embodiments of the present invention has at least the following beneficial effects:

[0018] The camera gimbal employing the aforementioned rebound force adjustment mechanism can drive different torque elastic elements or different numbers of torque elastic elements connected between the fixed base and the rotating base by rotating the rotary clutch mechanism. This facilitates user adjustment and operation, and also helps to simplify the structure of the camera gimbal and improve the overall structural compactness.

[0019] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0021] Figure 1 This is a schematic diagram of the structure of an embodiment of the rebound force adjustment mechanism of the present invention applied to a photographic gimbal;

[0022] Figure 2 for Figure 1 A schematic diagram of a cross-section of an embodiment;

[0023] Figure 3 for Figure 1 Exploded view of the rebound force adjustment mechanism in the embodiment;

[0024] Figure 4 This is a structural schematic diagram of one embodiment of a knob.

[0025] Figure label:

[0026] Fixture 100; Receiving cavity;

[0027] Rotary seat 200; rotating shaft 210; channel 211; movable opening slot 212

[0028] Torque elastic element 300; annular rubber sheet 310; outer metal ring 320; side ear 321; inner metal ring 330; mating groove 331;

[0029] Rotary clutch mechanism 400; knob 410; clutch element 420; clutch block 421; surface structure 430; boss 431; groove 432; transition slope 433; spring element 440;

[0030] Corner positioning mechanism 500; positioning groove 510; elastic positioning post 520;

[0031] Arc-shaped guide groove 610; guide post 620. Detailed Implementation

[0032] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0033] In the description of this invention, it should be understood that the orientation descriptions, such as the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer", indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0034] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] See Figures 1 to 4 The present invention provides a spring force adjustment mechanism, comprising: a fixed base 100 having a receiving cavity; a rotating base 200 rotatably disposed on the fixed base 100; a plurality of torsional elastic elements 300 located within the receiving cavity, each torsional elastic element 300 having a fixed end and a movable end, the fixed end of the torsional elastic element 300 being fixedly connected to one of the fixed base 100 and the rotating base 200; and a rotary clutch mechanism 400 rotatably disposed on the fixed base 100 or the rotating base 200, capable of driving the movable end of the torsional elastic element 300 to engage or disengage with the other of the fixed base 100 and the rotating base 200.

[0037] The fixed mount 100 is generally used for mounting on a camera bracket, while the swivel mount 200 is used for mounting external equipment such as cameras and camcorders. See also Figure 1 Depending on the usage requirements, a quick-release plate 700 can be installed on the swivel base 200 to facilitate the quick disassembly and installation of external equipment.

[0038] When the rebound force adjustment mechanism needs to adjust the rebound force acting on the rotating seat 200, the rotary clutch mechanism 400 can be rotated to drive different torque elastic elements 300 or different numbers of torque elastic elements 300 to be connected between the fixed seat 100 and the rotating seat 200. The rebound force received by the rotating seat 200 when rotating is adjusted by rotating the clutch. Moreover, the torque elastic elements 300 are all built into the fixed seat 100. The overall layout of the rebound force adjustment mechanism is compact and the adjustment operation is convenient.

[0039] See Figure 1 and Figure 2In some embodiments of the present invention, the fixed base 100 includes a cylindrical shell, which is horizontally placed and has its axis extending horizontally. The rotating base 200 is rotatably disposed at the end of the cylindrical shell about its axis. The inner cavity of the cylindrical shell forms at least part of the receiving cavity. The rotary clutch mechanism 400 includes a knob 410 rotatably disposed on the rotating base 200 and located at one end of the cylindrical shell. A plurality of clutches 420 corresponding one-to-one with the torsion elastic members 300 are movably disposed on the rotating base 200. The fixed end of the torsion elastic member 300 is disposed on the inner wall of the cylindrical shell. When the knob 410 is rotated, it can drive the clutches 420 to move through a linkage, so that the clutches 420 are connected to the movable end of the corresponding torsion elastic member 300.

[0040] It is understood that rotating the knob 410 can engage or disengage the corresponding clutch 420 and torque elastic element 300, thereby switching the number or specification of the torque elastic element 300 connected between the rotating seat 200 and the fixed seat 100, and thus adjusting the rebound force experienced by the rotating seat 200 when it rotates. It should be noted that, see [link to relevant documentation] Figure 1 and Figure 2 In this embodiment, when the rotating base 200 rotates around the axis of the cylindrical shell, the camera on the rotating base 200 generates an upward tilt angle or a downward tilt angle, causing the torsional elastic element 300 to deform. At this time, the rotating base 200, under the force of the torsional elastic element 300, tends to return to a horizontal state (i.e., the camera is in a level position). The knob 410 is rotatably mounted on the rotating base 200 and located at one end of the cylindrical shell. When the user holds the rotating base 200 and rotates it, it is not easy to accidentally touch the knob 410. This avoids the rebound force adjustment mechanism protruding along the side of the fixed base 100 and affecting operation, and also reduces the probability of accidentally touching the knob 410 during shooting, ensuring that the camera gimbal can stably support the camera or other external equipment.

[0041] See Figure 2 and Figure 3In some embodiments of the present invention, the torsion elastic element 300 includes an annular rubber sheet 310 built into the cylindrical shell. Multiple annular rubber sheets 310 are spaced apart along the length of the cylindrical shell. The outer periphery of the annular rubber sheet 310 is fixedly installed on the inner circumferential wall of the cylindrical shell. The rotating seat 200 has a rotating shaft portion 210 that movably passes through the inner periphery of the annular rubber sheet 310. The clutch element 420 is telescopically arranged along the length of the rotating shaft portion 210, i.e., the clutch element 420 is parallel to the rotating shaft portion. The axis of the rotating shaft 210 is such that multiple clutches 420 are circumferentially distributed around the axis of the rotating shaft 210 at intervals. The knob 410 is provided with a drive surface structure 430 that abuts against the clutches 420. The clutches 420 are connected to a spring 440 that drives them to abut against the drive surface structure 430. The clutches 420 are provided with clutch blocks 421 that protrude from the outer peripheral wall of the rotating shaft 210. The inner periphery of the annular rubber sheet 310 is provided with a engagement groove 331 that mates with the corresponding clutch block 421.

[0042] It should be noted that the torsion elastic element 300 is not limited to the above structural form. In other embodiments, the torsion elastic element 300 can also be replaced by a torsion spring or other structure that can drive the rotating seat 200 to rotate and reset.

[0043] See Figures 2 to 4 In this embodiment, the specifications of each annular rubber sheet 310 are consistent. When the knob 410 is rotated, the drive surface structure 430 can drive different clutches 420 to move along the length direction parallel to the rotating shaft 210, so that the clutch blocks 421 on different numbers of clutches 420 engage with the corresponding annular rubber sheet 331. The rebound force received by the rotating seat 200 when rotating is adjusted by adjusting the number of annular rubber sheets 310 connected between the rotating seat 200 and the fixed seat 100.

[0044] It should be noted that in some embodiments, the various annular rubber sheets 310 can be configured with different thicknesses. Thicker annular rubber sheets 310 can provide greater rebound force. When the knob 410 is rotated, the drive surface structure 430 can drive the clutches 420 at different positions to move along the length of the rotating shaft 210, thereby combining with the annular rubber sheets 310 of different thicknesses to provide different magnitudes of rebound force for the reset rotation of the rotating seat 200.

[0045] See Figure 3In some embodiments, in order to achieve the installation and positioning of the annular rubber sheet 310, a metal outer ring 320 is fixedly provided on the outer peripheral wall of the annular rubber sheet 310, and a metal inner ring 330 is fixedly provided on the inner peripheral wall of the annular rubber sheet 310. A mating groove 331 is provided on the metal inner ring 330. The metal outer ring 320 has a side ear 321. Correspondingly, the inner peripheral wall of the cylindrical shell is provided with a mounting groove for fixing the side ear 321. In this embodiment, the side ears 321 on each metal outer ring 320 are sequentially and spaced out in the mounting groove. Then, the mounting plate 800 is fixed to the rotating seat 200 by screws. The mounting plate 800 prevents the torsional elastic member 300 from coming out along the extension direction of the mounting groove. The mounting groove prevents the side ear 321 from rotating relative to the cylindrical shell.

[0046] Specifically, when manufacturing the torsion elastic element 300 with the above structure, the outer metal ring 320 and the inner metal ring 330 are first processed, and then the outer metal ring 320 and the inner metal ring 330 are placed in a mold for injection molding to obtain an annular rubber sheet 310. When the annular rubber sheet 310 is twisted and deformed, the annular rubber sheet 310, the outer metal ring 320 and the inner metal ring 330 are integrated into a single structure, which helps to provide a stable rebound force for the rotating seat 200 and also improves the service life of the torsion elastic element 300.

[0047] In addition, to prevent interference between two adjacent annular rubber sheets 310, a separator is provided between the metal outer rings 320 on two adjacent torsional elastic members 300 so that the two annular rubber sheets 310 are separated by a fixed distance.

[0048] See Figure 4 In some embodiments of the present invention, the drive surface structure 430 includes a plurality of bosses 431 circumferentially distributed around the rotation axis of the knob 410, with a groove 432 between two adjacent bosses 431, and a transition slope 433 between adjacent bosses 431 and grooves 432. The transition slope 433 facilitates the movement of the clutch 420 between the bosses 431 and the grooves 432, preventing jamming. The number of bosses 431, grooves 432 and clutches 420 is consistent. In the rotation direction of the knob 410, the bosses 431 and the grooves 432 located behind them correspond to one clutch 420. When the knob 410 is rotated, the clutch 420 can successively leave the boss 431 and enter the corresponding groove 432 so that the clutch block 421 engages with the corresponding engagement groove 331, thereby connecting the corresponding annular rubber sheet 310 between the rotating seat 200 and the fixed seat 100.

[0049] See Figure 2 and Figure 4It should be noted that, in the initial state, each clutch component 420 abuts against its corresponding boss portion 431. At this time, the clutch block 421 on each clutch component 420 is separated from the engagement groove 331 on the annular rubber sheet 310, and the rotating seat 200 is not subjected to a rebound force. When the knob component 410 is rotated to a certain angle, at least one of the clutch components 420 leaves the original boss portion 431 and enters the groove portion 432 located behind the boss portion 431. At this time, the clutch component 420 can engage with the corresponding annular rubber sheet 310. When the knob component 410 is rotated to different angle positions, different numbers of annular rubber sheets 310 are connected to the rotating seat 200.

[0050] See Figure 4 In some embodiments of the present invention, in the rotation direction of the knob 410, the area of ​​the boss portion 431 that can contact the corresponding clutch portion 420 gradually increases, and the area of ​​the groove portion 432 that can contact the corresponding clutch portion 420 gradually decreases.

[0051] Specifically, in this embodiment, four bosses 431, four grooves 432, and four clutches 420 are provided. In the initial state, the four clutches 420 abut against the four bosses 431 respectively, and each clutch block 421 is separated from the engagement groove 331 on the annular rubber sheet 310. At this time, the rotating seat 200 will not be subjected to the effect of rebound force.

[0052] Let S1 be the area of ​​the boss 431 that can contact the corresponding clutch 420, and let S2 be the area of ​​the groove 432 that can contact the corresponding clutch 420. When the knob 410 is rotated a°, the first clutch 420 leaves the boss 431 where S1 is the minimum value and enters the groove 432 where S2 is the maximum value. The other three clutches 420 still abut against their respective bosses 431. At this time, only one annular rubber sheet 310 acts on the rotating seat 200.

[0053] When the knob 410 is rotated a° again, the first clutch 420 moves in the groove 432 where S2 is the maximum value, the second clutch 420 leaves the boss 431 where S1 is the second minimum value and enters the groove 432 where S2 is the second maximum value, and the other two clutches 420 still abut against their respective bosses 431. At this time, two annular rubber sheets 310 act on the rotating seat 200.

[0054] When the knob 410 is rotated a° again, the first clutch 420 continues to move in the groove 432 where S2 is the maximum value, the second clutch 420 moves in the groove 432 where S2 is the second maximum value, and the third clutch 420 leaves the boss 431 where S1 is the second maximum value and enters the groove 432 where S2 is the second minimum value. The remaining clutch 420 still abuts against the corresponding boss 431. At this time, three annular rubber sheets 310 act on the rotating seat 200.

[0055] When the knob 410 is rotated a° again, the first clutch 420 continues to move within the groove 432 where S2 is at its maximum value, the second clutch 420 continues to move within the groove 432 where S2 is at its second maximum value, the third clutch 420 moves within the groove 432 where S2 is at its second minimum value, and the fourth clutch 420 moves away from the boss 431 where S1 is at its maximum value and enters the groove 432 where S2 is at its minimum value. At this time, all four annular rubber sheets 310 act on the rotating seat 200. It should be noted that the knob 410 has an initial angular position and four angular positions; therefore, the following condition must be met: 0 < a° ≤ 18°.

[0056] The above-mentioned rebound force adjustment mechanism integrates the clutch action of all torque elastic elements 300 into a knob 410 and multiple clutch elements 420 with a simple and ingenious structure. The rebound force acting on the rotating seat 200 can be adjusted simply by turning the knob 410, which is very convenient to use.

[0057] See Figure 2 and Figure 3 In some embodiments of the present invention, the rotating shaft portion 210 has a plurality of channels 211 circumferentially distributed around its axis. The outer peripheral wall of the rotating shaft portion 210 is provided with a movable opening groove 212 communicating with the channels 211 to allow the clutch block 421 to extend. The clutch member 420 is a rod that passes through the channel 211 for telescopic movement. A spring member 440 is provided between the end of the rod away from the driving surface structure 430 and the rotating shaft portion 210. The extension direction of the movable opening groove 212 is consistent with the extension direction of the channel 211. The channel 211 serves as a telescopic guide for the clutch member 420. The end of the clutch member 420 abuts against the driving surface structure 430 under the action of the spring member 440. When the knob member 410 is rotated, the driving surface structure 430 can drive the rod to move along the channel 211, thereby causing the clutch block 421 to enter or leave the engagement groove 331.

[0058] See Figure 2 and Figure 3In some embodiments of the present invention, in order to fix the knob 410 after rotating at a certain angle, so as to prevent the torsion elastic element 300 from falling off during operation, an angle positioning mechanism 500 is provided between the knob 410 and the rotating seat 200.

[0059] See Figure 3 In some embodiments of the present invention, the corner positioning mechanism 500 includes a plurality of positioning grooves 510 circumferentially distributed around the rotation axis of the knob 410 and elastic positioning posts 520 that match the positioning grooves 510. One of the positioning grooves 510 and the elastic positioning posts 520 is located on the end face of the rotating base 200, and the other is located on the end face of the knob 410 facing the rotating base 200. It can be understood that when the elastic positioning post 520 is combined with the positioning grooves 510 at different angular positions, different combinations of torsional elastic elements 300 act on the rotating base 200.

[0060] See Figure 3 and Figure 4 In some embodiments of the present invention, in order to guide the rotation of the knob 410 and ensure that the elastic positioning post 520 can enter the positioning groove 510, an arc-shaped guide groove 610 is provided on the end face of the knob 410 facing the rotating seat 200, which is arranged around the rotation axis of the knob 410, and a guide post 620 matching the arc-shaped guide groove 610 is provided on the end face of the rotating seat 200.

[0061] See Figure 1 The present invention also discloses a camera gimbal, including the rebound force adjustment mechanism of any of the above-mentioned technical solutions. The camera gimbal employing the above-mentioned rebound force adjustment mechanism can drive different torque elastic elements 300 or different numbers of torque elastic elements 300 connected between the fixed base 100 and the rotating base 200 by rotating the rotary clutch mechanism 400. This facilitates user adjustment and operation, and also simplifies the structure of the camera gimbal, improving the overall structural compactness.

[0062] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A rebound force adjustment mechanism, characterized in that, include: A fixing base (100) having a receiving cavity therein; A rotating seat (200) is rotatably mounted on the fixed seat (100); Multiple torsion elastic elements (300) are located in the accommodating cavity. Each torsion elastic element (300) has a fixed end and a movable end. The fixed end of the torsion elastic element (300) is fixedly connected to one of the fixed seat (100) and the rotating seat (200). A rotary clutch mechanism (400) is rotatably mounted on the fixed seat (100) or the rotating seat (200), capable of driving the movable end of the torsion elastic element (300) to engage or disengage with the other of the fixed seat (100) and the rotating seat (200); the fixed seat (100) includes a cylindrical shell, the rotating seat (200) is rotatably mounted on the end of the cylindrical shell about the axis of the cylindrical shell, and the rotary clutch mechanism (400) includes a knob rotatably mounted on the rotating seat (200) and located at one end of the cylindrical shell. (410) The rotating seat (200) is movably provided with a plurality of clutches (420) corresponding one-to-one with the torque elastic elements (300). The fixed end of the torque elastic element (300) is located on the inner wall of the cylindrical shell. When the knob (410) is rotated, it can drive the clutches (420) to move and connect to the moving end of the corresponding torque elastic element (300). The torque elastic element (300) includes an annular rubber sheet (310) built into the cylindrical shell. The plurality of annular rubber sheets (310) are arranged along the length of the cylindrical shell. The annular rubber sheet (310) is fixedly installed on the inner circumferential wall of the cylindrical shell, and the rotating seat (200) has a rotating shaft (210) that movably passes through the inner circumference of the annular rubber sheet (310). The clutch (420) is telescopically arranged along the length direction of the rotating shaft (210). The knob (410) is provided with a driving surface structure (430) that abuts against the clutch (420). The clutch (420) is connected to a spring (440) that drives it to abut against the driving surface structure (430). The clutch (420) is provided with a clutch block (421) protruding from the outer peripheral wall of the rotating shaft (210), and the inner periphery of the annular rubber sheet (310) is provided with a engagement groove (331) that cooperates with the corresponding clutch block (421). When the knob (410) is rotated, the clutch (420) can successively drive the clutch block (421) to engage with the corresponding engagement groove (331), thereby connecting the corresponding annular rubber sheet (310) between the rotating seat (200) and the fixed seat (100).

2. The spring force adjustment mechanism according to claim 1, characterized in that: The drive surface structure (430) includes a plurality of bosses (431) circumferentially distributed around the rotation axis of the knob (410), with a groove (432) between two adjacent bosses (431), and a transition slope (433) between adjacent bosses (431) and grooves (432). The number of bosses (431), grooves (432) and clutches (420) is the same. In the rotation direction of the knob (410), the bosses (431) and the grooves (432) behind them correspond to one clutch (420).

3. The spring force adjustment mechanism according to claim 2, characterized in that: In the rotation direction of the knob (410), the area of ​​the boss (431) that can contact the corresponding clutch (420) gradually increases, and the area of ​​the groove (432) that can contact the corresponding clutch (420) gradually decreases.

4. The spring force adjustment mechanism according to claim 1, characterized in that: The rotating shaft (210) has multiple channels (211) distributed circumferentially around its axis. The outer peripheral wall of the rotating shaft (210) is provided with a movable opening slot (212) that communicates with the channel (211) to allow the clutch block (421) to extend. The clutch member (420) is a rod that passes through the channel (211) for telescopic movement. The spring member (440) is located between the end of the rod away from the driving surface structure (430) and the rotating shaft (210).

5. The spring force adjustment mechanism according to claim 1, characterized in that: An angle positioning mechanism (500) is provided between the knob (410) and the rotating base (200).

6. The spring force adjustment mechanism according to claim 5, characterized in that: The corner positioning mechanism (500) includes a plurality of positioning grooves (510) circumferentially distributed around the rotation axis of the knob (410) and elastic positioning posts (520) that match the positioning grooves (510). One of the positioning grooves (510) and the elastic positioning posts (520) is located on the end face of the rotating seat (200), and the other is located on the end face of the knob (410) facing the rotating seat (200).

7. The spring force adjusting mechanism according to claim 6, characterized in that: The knob (410) has an arc-shaped guide groove (610) on its end face facing the rotating seat (200) and an guide post (620) that matches the arc-shaped guide groove (610).

8. A photographic gimbal, characterized in that, Includes the rebound force adjustment mechanism according to any one of claims 1-7.

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