Angle adjusting mechanism

Abstract

The utility model discloses an angle adjusting mechanism which is characterized in that a gear is rotatably mounted on a mounting seat, a half-tooth block rotatably hinged on the mounting seat through a rotating shaft is arranged on one side of the gear, and convex tooth structures meshed with the gear are respectively arranged at two ends of one side, opposite to the gear, of the half-tooth block. Two limiting clamping grooves are formed in the side, away from the gear, of the half-tooth block. An elastic supporting mechanism inserted into the limiting clamping groove in a matched manner is arranged on the mounting seat; when the elastic supporting mechanism is inserted into one limiting clamping groove in one side of the rotating shaft, the gear and the convex tooth structure, located on the other side of the rotating shaft, of the half-tooth block of the gear are meshed, and when one convex tooth structure is meshed with the gear, the half-tooth block and the gear can only rotate oppositely in the single direction. According to the angle adjusting mechanism, when any convex tooth structure of the half-tooth block is meshed with the gear, the half-tooth block can only rotate in one direction due to the rotating torque. Therefore, the driving mechanism drives the half-tooth block to rotate to switch the convex tooth structure, meshed with the gear, of the half-tooth block, the permissible direction of rotation of the half-tooth block relative to the gear can be changed, and therefore the rotation direction of the angle adjusting mechanism is limited and changed.

Description

TECHNICAL FIELD

[0001] The utility model relates to angle adjusting mechanism technical field, especially angle adjusting mechanism and seat chair. BACKGROUND

[0002] Ergonomic chair is a kind of seat specially designed to provide comfortable support for users, reduce the discomfort and health problems caused by long time sitting posture. Ergonomic chair usually needs to have adjustability for the above purpose, and its seat usually has a variety of adjustable components, such as the angle of seat cushion, armrest angle, waist support, backrest, footrest and headrest, etc. All of them need to be adjusted according to individual needs to ensure that everyone can find the most comfortable sitting posture. Therefore, the mechanical structure of angle adjusting mechanism is widely used to adjust the angle of each part of the chair as needed. However, the existing angle adjusting mechanism is difficult to limit and adjust the direction of rotation when in use, or the direction of one-way locking is unique, and cannot still be one-way locked after reversing, cannot limit and change the rotation direction according to needs, and the practicability is poor. SUMMARY

[0003] The utility model aims at providing an angle adjusting mechanism and a seat chair to solve the problem that the existing angle adjusting mechanism cannot limit and change the direction of rotation.

[0004] In order to solve the above technical problems, the utility model provides the following technical scheme: an angle adjusting mechanism, comprising a mounting seat, a gear rotatable relative to the mounting seat is arranged in the mounting seat, a rotating shaft for driving the gear to rotate is sleeved in the center of the gear, a half tooth block is arranged on one side of the gear, and a driving mechanism for driving the half tooth block to rotate is arranged in the mounting seat, and the half tooth block is rotatably hinged to the mounting seat through a rotating shaft; two ends of the side opposite to the gear of the half tooth block are respectively provided with a first protruding tooth and a second protruding tooth engaged with the gear, and the first protruding tooth and the second protruding tooth are respectively located on both sides of the center of the rotating shaft; a first limiting slot and a second limiting slot are arranged on the side away from the gear of the half tooth block, and the first limiting slot and the second limiting slot are also respectively located on both sides of the center of the rotating shaft; an elastic supporting mechanism is arranged on the mounting seat and inserted into the first limiting slot and the second limiting slot; when the elastic supporting mechanism is inserted into the first limiting slot, the gear is engaged with the second protruding tooth, and the gear can only rotate in a first direction; when the elastic supporting mechanism is inserted into the second limiting slot, the gear is engaged with the first protruding tooth, and the gear can only rotate in a second direction; the first direction and the second direction are opposite.

[0005] Further, a coil spring is further installed on the mounting seat, one end of the coil spring is fixedly connected with the gear or the rotating shaft, and the coil spring is driven to rotate by the gear, and the other end of the coil spring is fixedly connected with the mounting seat.

[0006] Further, the gear and the rotating shaft are fixed in the circumferential direction through the matching polygonal structure.

[0007] Further, the mounting base comprises the first mounting plate and the second mounting plate fixedly arranged oppositely, the gear is rotatably arranged between the first mounting plate and the second mounting plate, the rotating shaft is movably arranged through the first mounting plate and the second mounting plate, the half-tooth block is rotatably arranged between the first mounting plate and the second mounting plate through the rotating shaft, and the elastic supporting mechanism is fixedly arranged between the first mounting plate and the second mounting plate.

[0008] Further, the first mounting plate is provided with the first mounting hole in the center, the second mounting plate is provided with the second mounting hole in the center, the gear is fixedly arranged through the shaft sleeve in the center, the shaft sleeve is fixedly sleeved on the rotating shaft, and the shaft sleeve is movably arranged through the first mounting hole and the second mounting hole at the two ends.

[0009] Further, the half-tooth block is provided with the lever pin as the rotating shaft and is rotatably arranged between the first mounting plate and the second mounting plate, the two ends of the lever pin are respectively inserted into the lever pin mounting hole arranged on one side of the first mounting plate and the pin hole arranged on one side of the second mounting plate.

[0010] Further, one side of the half-tooth block close to the gear is provided with the pushing block, the first mounting plate is provided with the mounting hole, and the pushing block is movably arranged through the first mounting plate from the mounting hole.

[0011] Further, the mounting hole and the lever pin mounting hole are communicated and integrated.

[0012] Further, the driving mechanism comprises the stop washer, the stop washer is sleeved on the shaft sleeve on one side of the first mounting plate, two limiting protrusions are arranged on the outer circumference of the stop washer, and the pushing block is arranged between the two limiting protrusions in a matched mode.

[0013] Further, the stop washer and the shaft sleeve are fixed through the matching concave-convex structure.

[0014] Further, the elastic supporting mechanism comprises the clamping joint, the fixed sleeve and the supporting spring, the supporting spring is arranged on the inner bottom surface of the fixed sleeve, the clamping joint is arranged on the top of the supporting spring, and the clamping joint is movably arranged through the center of the top of the fixed sleeve.

[0015] Further, the supporting spring is provided with the guide rod on the outer side, the limiting part is arranged on the side wall of the clamping joint and extends outward, and the limiting part is movably sleeved on the guide rod.

[0016] Further, the first mounting plate and the second mounting plate are respectively provided with the first mounting groove and the second mounting groove oppositely, and the fixed sleeve is embeddedly arranged in the first mounting groove and the second mounting groove.

[0017] Further, the shaft sleeve is provided with a clamping hole on one side top of the second mounting plate, and one end of a coil spring is clamped and fixed in the clamping hole, and the other end of the coil spring is fixedly connected with one end of the lever pin penetrating through the second mounting plate.

[0018] Further, the shaft sleeve is provided with a clamping hole on one side top of the second mounting plate, and one end of a coil spring is clamped and fixed in the clamping hole, and the other end of the coil spring is fixedly connected with one end of the lever pin penetrating through the second mounting plate.

[0019] The angle adjusting mechanism has the advantages that the elastic supporting mechanism supports the half tooth block, the half tooth block is rotatably installed on the rotating shaft, the side of the half tooth block facing the gear has two protruding tooth structures, the first protruding tooth and the second protruding tooth are located on the two sides of the rotating shaft axis, the two limiting clamping grooves on the side away from the gear are also located on the two sides of the rotating shaft axis, the two limiting clamping grooves and the two protruding tooth structures cross and correspond to each other, when the elastic supporting mechanism supports the first limiting clamping groove on one side of the axis, the second protruding tooth structure on the other side of the axis is engaged with the gear, at this time, the half tooth block rotates in two rotating directions, clockwise and counterclockwise, and in one rotating direction, the rotating torque of the second protruding tooth under stress and the rotating torque of the elastic supporting structure at the first limiting clamping groove are opposite, so that the half tooth block cannot rotate; in the other rotating direction, the rotating torques of the protruding tooth structure under stress and the limiting clamping groove are in the same direction, and the half tooth block can rotate smoothly, so that the half tooth block and the gear can only rotate in the first direction. The driving mechanism drives the half tooth block to rotate, the protruding tooth structure engaged with the gear can be switched, when the elastic supporting mechanism supports the second limiting clamping groove on one side of the axis, the first protruding tooth structure on the other side of the axis is engaged with the gear, so that the allowed direction of the half tooth block rotating relative to the gear can be changed, the half tooth block and the gear can only rotate in the second direction, and the rotating direction of the angle adjusting mechanism can be limited and changed. The driving structure drives the half tooth block to rotate and switch the protruding tooth structure engaged with the gear, the rotating direction of the angle adjusting mechanism is limited and changed, and the operation is very simple and convenient. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a perspective view of the overall structure of the utility model;

[0021] Figure 2 It is a perspective view of the overall structure of the utility model;

[0022] Figure 3 It is an exploded view of the overall structure of the utility model;

[0023] Figure 4 It is a schematic view of the A area of the utility model; Figure 3 ​

[0024] Figure 5 For the utility model Figure 3 The enlarged view of the middle B area;

[0025] Figure 6 For the utility model half tooth block perspective view;

[0026] Figure 7 For the utility model elastic support mechanism front view section view;

[0027] Figure 8 For the utility model after removing the second mounting plate structure schematic view;

[0028] Figure 9 For the utility model after removing the first mounting plate structure schematic view.

[0029] In the figure: 1, the first mounting plate; 2, the second mounting plate; 3, the coil spring; 4, lever pin; 5, shaft sleeve; 6, elastic support mechanism; 7, rotating shaft; 8, first installation slot; 9, connecting pin; 10, gear; 11, clamping hole; 12, first mounting hole; 13, pin hole; 14, half tooth block; 15, lever pin mounting hole; 16, second installation slot; 17, limit bump; 18, check ring; 19, second mounting hole; 20, first limit clamping groove; 21, second limit clamping groove; 22, knob; 601, clamping head; 602, fixed sleeve; 603, limit ring; 604, support spring; 605, guide rod. DETAILED DESCRIPTION

[0030] In order to make the utility model embodiment purposes, technical scheme and advantages more clearly, below will combine the utility model embodiment's attached drawing, the technical scheme in the utility model embodiment is clearly, completely described, obviously, the described embodiment is the utility model one part embodiment, rather than all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor are within the scope of the utility model protection.

[0031] Embodiment, such as Figures 1-9The angle adjusting mechanism comprises a mounting base, a gear wheel 10 mounted on the mounting base and rotatable relative to the mounting base, a rotating shaft 7 sleeved with the gear wheel and capable of driving the gear wheel to rotate, a half-tooth block 14 arranged on one side of the gear wheel, a driving mechanism capable of driving the half-tooth block to rotate, the half-tooth block being rotatably hinged to the mounting base through a rotating shaft, two convex-tooth structures 141 and 142 arranged at the two ends of the side of the half-tooth block opposite to the gear wheel and capable of meshing with the gear wheel, the two convex-tooth structures being respectively located at the two sides of the center of the rotating shaft, two limiting clamping grooves 20 and 21 arranged on the side of the half-tooth block away from the gear wheel, the centers of the two limiting clamping grooves also being respectively located at the two sides of the center of the rotating shaft, a resilient supporting mechanism 6 arranged on the mounting base and capable of being inserted into the limiting clamping grooves, the two limiting clamping grooves being staggered corresponding to the two convex-tooth structures, that is, when the resilient supporting mechanism is inserted into one limiting clamping groove on one side of the rotating shaft, the gear wheel and the half-tooth block are meshed with the convex-tooth structure on the other side of the rotating shaft, so that the half-tooth block and the gear wheel can only rotate in one direction when the one convex-tooth structure is meshed with the gear wheel, the two limiting clamping grooves are respectively a first limiting clamping groove 20 and a second limiting clamping groove 21, and the two convex-tooth structures are respectively a first convex-tooth 141 and a second convex-tooth 142, when the resilient supporting mechanism 6 is inserted into the first limiting clamping groove 20, the gear wheel is meshed with the second convex-tooth structure 142, and the gear wheel can only rotate in a first direction relative to the half-tooth block, and when the resilient supporting mechanism 6 is inserted into the second limiting clamping groove 21, the gear wheel is meshed with the first convex-tooth structure 141, and the gear wheel can only rotate in a second direction opposite to the first direction relative to the half-tooth block.

[0032] A coil spring 3 can be mounted on the mounting base, one end of the coil spring 3 being fixedly connected with the gear wheel, which can be directly fixed with the gear wheel 10, fixed with the rotating shaft 7 of the gear wheel 10, or fixed with a shaft sleeve mounted on the rotating shaft 7, as long as the gear wheel 10 can drive the coil spring to rotate and accumulate potential energy when rotating, and the other end of the coil spring is fixedly connected with the mounting base. Through the arrangement of the coil spring, the coil spring can provide a reverse and adaptive elastic force during the rotation of the gear wheel during the angle adjustment process, so that the operation of the rotation adjustment process has a better hand feeling and a pulling feeling, thereby achieving slow and gradual adjustment and avoiding the sudden change and difficult control of the angle adjustment without reverse force. At the same time, the elastic potential energy of the coil spring can be quickly released during the switching of different convex-tooth structures meshing with the gear wheel, and the coil spring can also be quickly returned.

[0033] The gear wheel 10 and the rotating shaft 7 can be circumferentially fixed through matched polygonal structures, such as Figure 3 , Figure 8 .

[0034] The mounting base can be an integral structure or a split structure, such as Figures 1-3, it includes the first mounting plate 1 and the second mounting plate 2, the first mounting plate 1 is relatively fixedly connected with the second mounting plate 2 through the connecting pin 9. The connecting pin 9 for fixing the first mounting plate 1 and the second mounting plate can adopt two, three or even more, as long as reliable connection can be guaranteed. The gear 10 is rotatably installed between the first mounting plate 1 and the second mounting plate 2; the half tooth block 14 is also rotatably installed between the first mounting plate 1 and the second mounting plate 2 through the rotating shaft, and the elastic supporting mechanism 6 is also fixedly arranged between the first mounting plate 1 and the second mounting plate 2.

[0035] The first mounting plate 1 is provided with a first mounting hole 12 in the center, the second mounting plate 2 is provided with a second mounting hole 19 in the center, the gear 10 is fixedly penetrated by a shaft sleeve 5 in the center, the shaft sleeve 5 is fixedly sleeved on the rotating shaft 7, and the both ends of the shaft sleeve 5 are respectively penetrated through the first mounting hole 12 and the second mounting hole 19.

[0036] The half tooth block 14 is rotatably installed between the first mounting plate 1 and the second mounting plate 2 by arranging a lever pin 4 as a rotating shaft, and the both ends of the lever pin are respectively inserted into the lever pin mounting hole 15 arranged on one side of the first mounting plate and the pin hole 13 arranged on one side of the second mounting plate.

[0037] The side of the half tooth block 14 close to the gear 10 can be provided with a pushing block 22, the first mounting plate 1 is provided with an opposite mounting hole, and the pushing block 22 is penetrated out of the first mounting plate 1 from the mounting hole. In order to provide the rotating space of the pushing block 22, the mounting hole is preferably in the shape of a sector. The mounting hole can be separated from the lever pin mounting hole 15, or can be communicated as a whole with the lever pin mounting hole 15, and the communication as a whole is preferred, such as Figure 5 , the structure is simpler.

[0038] The side of the pushing block 22 penetrated out of the first mounting plate 1 from the mounting hole can be extended to arrange an operating rod as a driving structure for driving the half tooth block 14 to rotate, and the half tooth block can be driven to rotate by pushing and pulling the operating rod back and forth, so that the switching of the convex tooth structure meshing with the gear is realized.

[0039] The driving mechanism for driving the half tooth block 14 to rotate can also be a check ring 18, such as Figure 3 , Figure 5 The check ring 18 is axially fixed at the end of the shaft sleeve 5 on one side of the first mounting plate 1, two limiting lugs 17 are mounted on the outer circumference of the check ring 18, and the pushing block 22 is arranged between the two limiting lugs 17. When the half tooth block and the gear rotate relative to each other and any limiting lug 17 collides with it, the limiting lug will limit the pushing block, and the half tooth block will be pressed, when the pressing force reaches a certain degree, the half tooth block will be forced to swing, and the elastic supporting mechanism will be compressed, so as to switch to another meshing position, realize the switching of the half tooth block, and thus convert the limitation of the angle adjustment direction.

[0040] The retaining ring 18 and the bushing 5 are fixed together by a matching concave-convex structure, such as... Figure 5 , Figure 9 To avoid relative motion.

[0041] The elastic support mechanism 6 can be a gas spring. The elastic support mechanism 6 can also be as follows: Figure 7 The device includes a snap-fit ​​connector 601, a fixing sleeve 602, and a support spring 604. The support spring 604 is installed on the bottom surface inside the fixing sleeve 602, and the snap-fit ​​connector 601 is installed on the top of the support spring 604. The top of the snap-fit ​​connector 601 extends through the center of the top of the fixing sleeve 602. The snap-fit ​​connector 601 cooperates with a limiting slot. Under the action of the bottom support spring 604, it can reliably engage in the limiting slot, providing elastic support for the half-tooth block. Simultaneously, when the half-tooth block experiences significant force during swinging and switching, it can retract to avoid displacement. Figure 9 This allows for the switching process.

[0042] like Figure 7 A guide rod 605 is provided on the outer side of the supporting spring, and a limiting part 603 is provided on the side wall of the snap-fit ​​connector 601, which extends outward and can be slidably sleeved on the guide rod 605. This sleeved structure allows the snap-fit ​​connector to move more vertically and smoothly, preventing tilting and affecting the elastic support effect. It is preferable to have two or more guide rods 605; two, three, or even more are possible.

[0043] The mating surface between the card connector 601 and the limiting card slot is preferably an arc surface, such as... Figure 8 , Figure 9 During the process of switching the drive half-tooth block from engaging with one convex tooth to engaging with another convex tooth, it can slide more smoothly from one limiting slot into another limiting slot, thus making the switching process smoother.

[0044] The first mounting plate 1 and the second mounting plate 2 may be respectively provided with a first mounting groove 8 and a second mounting groove 16, and the fixing sleeve 602 is embedded in the first mounting groove 8 and the second mounting groove 16.

[0045] The fixing sleeve 602 can also be directly welded and fixed between the two mounting plates.

[0046] The bushing 5 has a snap-fit ​​hole 11 on its top side relative to the second mounting plate 2. One end of the coil spring 3 is snapped and fixed inside the snap-fit ​​hole 11, and the other end of the coil spring 3 is fixedly connected to the second mounting plate. Alternatively, one end of the coil spring 3 can be fixed to the snap-fit ​​hole 11 of the bushing 5, and the other end can be fixedly connected to the end of the lever pin 4 that passes through the second mounting plate 2. Figure 1 , 2 .

[0047] The gear 10 and the rotating shaft 7 are circumferentially fixed through the matched polygonal structures, like Figure 8 .

[0048] In the description of the utility model, it is explained that, unless there is explicit provision and limitation, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through intermediate medium, can be the communication of two elements inside. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0049] The device embodiments described above are only schematic, wherein the units described as separate components can or can not be physically separate, and the components displayed as units can or can not be physical units, that is, they can be located in one place, or distributed on multiple network units. According to actual needs, part or all of the modules can be selected to achieve the purpose of the embodiment. Those skilled in the art can understand and implement without creative labor.

[0050] Finally, it should be noted that: the above examples are only used to illustrate the technical scheme of the utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical scheme recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical scheme deviate from the spirit and scope of the technical scheme of the utility model embodiments.

Claims

1. An angle adjusting mechanism comprising a mounting base, a gear (10) rotatable relative to the mounting base being arranged in the mounting base, a rotating shaft (7) being sleeved with the gear center and capable of driving the gear to rotate, characterized in that: The gear is provided with a half-tooth block (14) on one side, and a driving mechanism for driving the rotation of the half-tooth block, the half-tooth block being rotatably hinged to the mounting seat through a rotating shaft; the two ends of the side opposite to the gear of the half-tooth block are respectively provided with a first protruding tooth (141) and a second protruding tooth (142) engaged with the gear, the first protruding tooth (141) and the second protruding tooth (142) being respectively located on the two sides of the center of the rotating shaft; the side of the half-tooth block away from the gear is provided with a first limiting clamping groove (20) and a second limiting clamping groove (21), the first limiting clamping groove (20) and the second limiting clamping groove (21) being respectively located on the two sides of the center of the rotating shaft; the mounting seat is provided with an elastic supporting mechanism (6) inserted into the first limiting clamping groove (20) and the second limiting clamping groove (21); when the elastic supporting mechanism (6) is inserted into the first limiting clamping groove (20), the gear (10) is engaged with the second protruding tooth (142), and the gear (10) can only rotate in a first direction; when the elastic supporting mechanism (6) is inserted into the second limiting clamping groove (21), the gear is engaged with the first protruding tooth (141), and the gear can only rotate in a second direction; the first direction and the second direction are opposite.

2. The angular adjustment mechanism of claim 1, wherein: The mounting seat is further provided with a coil spring (3), one end of the coil spring being fixedly connected with the gear (10) and being driven to rotate by the gear (10), the other end of the coil spring being fixedly connected with the mounting seat.

3. An angle adjustment mechanism according to claim 1, characterized in that: The gear (10) and the rotating shaft (7) are circumferentially fixed through a matched polygonal structure.

4. The angular adjustment mechanism of claim 2, wherein: The mounting seat comprises a first mounting plate (1) and a second mounting plate (2) fixedly installed opposite to each other, the gear (10) being rotatably installed between the first mounting plate (1) and the second mounting plate (2), the rotating shaft (7) being movably penetrated through the first mounting plate (1) and the second mounting plate (2), the half-tooth block (14) being rotatably installed between the first mounting plate (1) and the second mounting plate (2) through a rotating shaft, and the elastic supporting mechanism (6) being fixedly arranged between the first mounting plate (1) and the second mounting plate (2).

5. An angle adjustment mechanism according to claim 4, characterised in that: The first mounting plate (1) is provided with a first mounting hole (12) in the center, the second mounting plate (2) is provided with a second mounting hole (19) in the center, the gear (10) is fixedly penetrated through a shaft sleeve (5) in the center, the shaft sleeve (5) is fixedly sleeved on the rotating shaft (7), and the two ends of the shaft sleeve (5) are respectively penetrated through the first mounting hole (12) and the second mounting hole (19).

6. An angle adjustment mechanism according to claim 5, characterised in that: The half-tooth block is provided with a lever pin (4) as a rotating shaft rotatably installed between the first mounting plate (1) and the second mounting plate (2), the two ends of the lever pin being respectively inserted into a lever pin mounting hole (15) provided on one side of the first mounting plate (1) and a pin hole (13) provided on one side of the second mounting plate (2).

7. An angle adjustment mechanism according to claim 6, characterised in that: The side of the half-tooth block close to the gear (10) is provided with a pushing block (22), the first mounting plate is provided with a mounting hole, and the pushing block (22) is penetrated out of the first mounting plate from the mounting hole.

8. The angular adjustment mechanism of claim 7, wherein: The mounting hole and the lever pin mounting hole (15) are communicated in one body.

9. The angular adjustment mechanism of claim 7, wherein: The driving mechanism comprises a stop ring (18) sleeved on the shaft sleeve (5) on one side of the first mounting plate (1), two limiting lugs (17) are mounted on the outer circumference of the stop ring (18), and the poking block (22) is arranged between the two limiting lugs (17) in a matched mode.

10. An angle adjustment mechanism according to claim 9, characterised in that: The stop ring (18) and the shaft sleeve (5) are fixed through matched concave-convex structures.

11. An angle adjustment mechanism according to any one of claims 5-10, characterized in that: The elastic supporting mechanism (6) comprises a clamping joint (601), a fixing sleeve (602) and a supporting spring (604), the supporting spring (604) is mounted on the inner bottom surface of the fixing sleeve (602), the clamping joint (601) is mounted on the top of the supporting spring (604), and the clamping joint (601) is movably penetrated through the top center of the fixing sleeve (602).

12. The angular adjustment mechanism of claim 11, wherein: The outer side of the supporting spring is provided with a guide rod (605), the side wall of the clamping joint (601) is provided with an outwardly extending limiting portion (603), and the limiting portion (603) is sleeved on the outer side of the guide rod (605) in a relatively slidable mode.

13. The angular adjustment mechanism of claim 11, wherein: The first mounting plate (1) and the second mounting plate (2) are respectively provided with opposite first mounting grooves (8) and second mounting grooves (16), and the fixing sleeve (602) is embeddedly mounted in the first mounting grooves (8) and the second mounting grooves (16).

14. The angular adjustment mechanism of claim 5, wherein: The shaft sleeve (5) is provided with a clamping hole (11) on the top of one side of the second mounting plate (2), one end of the coil spring (3) is clamped and fixed in the clamping hole (11), and the other end of the coil spring (3) is fixedly connected with the second mounting plate.

15. An angle adjustment mechanism according to claim 5, characterized in that: The shaft sleeve (5) is provided with a clamping hole (11) on the top of one side of the second mounting plate (2), one end of the coil spring (3) is clamped and fixed in the clamping hole (11), and the other end of the coil spring (3) is fixedly connected with the second mounting plate.

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