Limiting mechanism

Abstract

This invention discloses a limiting mechanism, comprising: a base, the base including a base body and a through hole penetrating the base body; a first bearing, the first bearing being mounted in the through hole; a turntable, the turntable including a turntable body inserted into the first bearing and a lever extending protruding from the turntable body; a rocker assembly, the rocker assembly including a second bearing fixed to the base body, a rocker arm inserted into the second bearing, a slider slidably connected to the rocker arm, an elastic element connecting the rocker arm and the slider, a moving magnet fixed to the slider, and a fixed magnet fixed to the base body; limiting portions are respectively provided on opposite sides of the base body corresponding to the slider, and are equally spaced from the slider; the lever is limited by the slider and the limiting portions. The limiting mechanism of this invention not only has fewer movements and a simple structure, but also occupies less space, has high reliability, and can reduce noise generation.

Description

[Technical Field]

[0001] This invention relates to the field of turntable limiting technology, and more particularly to a limiting mechanism. [Background Technology]

[0002] With the rapid development of mechanical technology, more and more industries are beginning to use turntables to achieve mechanical rotation operations.

[0003] Currently, there are relatively few rotary positioning structures in existing technologies that can rotate to a range greater than ±180° (positive and negative 180 degrees). Moreover, most rotary positioning structures cannot simultaneously rotate to a range greater than +180° and greater than -180°. In other applications, rotary positioning structures use complex mechanical limits such as helical positioning and follow-up slider matching buffers to cooperate with electrical or software limits in order to protect the rotating mechanism from abnormal rotation.

[0004] However, the aforementioned rotary positioning structures used in turntables have many complex movements, occupy a large space, and have relatively poor compatibility with various turntables. Moreover, most of them rely solely on electrical limits to achieve rotary positioning greater than ±180°, which poses a potential risk of electrical component failure and results in low reliability when used on turntables.

[0005] Therefore, it is necessary to provide a limiting mechanism to solve the above problems. [Summary of the Invention]

[0006] The technical problem to be solved by the present invention is how to provide a limiting mechanism with fewer movements, simple structure, small space occupation, high reliability and effective noise reduction.

[0007] To solve the above-mentioned technical problems, the present invention provides a limiting mechanism for achieving forward and reverse rotation of more than 180 degrees, comprising:

[0008] A base, the base including a base body and a circular through hole penetrating the base body;

[0009] A first bearing is installed in the through hole and is fixedly connected to the base body;

[0010] The turntable includes a turntable body that is inserted into and fixedly connected to the first bearing and is in the shape of an annulus, and a lever that extends from the periphery of the turntable body. The turntable body is rotatably connected to the base body through the first bearing.

[0011] A rocker assembly, wherein the rocker assembly and the lever are disposed on the same side of the base body; the rocker assembly includes a second bearing fixedly connected to the base body, a rocker arm inserted into and fixedly connected to the second bearing, a slider sleeved on and slidably connected to the rocker arm, an elastic element connected between the rocker arm and the slider, a moving magnet fixed to the end of the slider away from the rocker arm, and a fixed magnet fixed to the base body and disposed opposite to the moving magnet. When the rocker arm is in its initial position, it and the lever are simultaneously located on a straight line with the same diameter of the turntable body, and the slider is spaced apart from the turntable body. The rocker arm is rotatably connected to the base body through the second bearing; the base body is provided with limiting portions on opposite sides of the slider along its circumference, which are equally spaced from the slider.

[0012] When the lever is rotated clockwise or counterclockwise to press against the slider, the lever engages with the slider; the lever continues to rotate to push the slider to rotate and at the same time stretch the slider along the axial direction of the rocker arm, until the lever rotates from the initial position to more than 180 degrees, causing the slider to abut against the limiting part on the corresponding side to achieve limitation.

[0013] Preferably, the base further includes an annular protrusion extending from the edge of the base body and surrounding the through hole, having a notch; the notch is directly opposite the slider, and the planes on both sides of the notch serve as two limiting portions located on opposite sides of the slider.

[0014] Preferably, the lever has protruding protrusions on its opposite sides; the slider has inwardly recessed grooves on its opposite sides that match the protrusions; when the lever is rotated clockwise or counterclockwise to press against the slider, the lever engages with the groove on the corresponding side of the slider through the protrusions.

[0015] Preferably, the rocker arm is recessed inward on the side away from the base body to form a first receiving groove, and a first mounting post is provided at the end of the first receiving groove away from the slider; a second receiving groove is provided inwardly recessed on the side of the slider near the base, and a second mounting post is provided at the end of the second receiving groove away from the rocker arm; the second receiving groove covers the rocker arm and forms a sliding connection with it; the elastic member is received in the first receiving groove and the second receiving groove, and the two ends of the elastic member are respectively fixed to the first mounting post and the second mounting post.

[0016] Preferably, guide grooves are provided through both sides of the second receiving groove; two spaced pins are inserted into both sides of the first receiving groove, and the pins extend into the guide grooves on the corresponding sides to limit the sliding stroke of the slider.

[0017] Preferably, the sliding contact surfaces of the slider and the rocker are both treated with diamond-like carbon coating.

[0018] Preferably, the base body includes a cylindrical first body portion and a first extension portion formed by protruding from the periphery of the first body portion, the through hole is formed in the first body portion, and the second bearing is fixedly connected to the first extension portion.

[0019] Preferably, the first body portion is provided with an inwardly recessed first fixing groove, and the second bearing is installed in the first fixing groove and forms a fixed connection with the first body portion; the first body portion is provided with an inwardly recessed second fixing groove, and the fixed magnet is installed in the second fixing groove and forms a fixed connection with the first body portion; the slider is provided with an inwardly recessed third fixing groove on the side near the first body portion, and the moving magnet is installed in the third fixing groove and forms a fixed connection with the slider.

[0020] Preferably, the turntable body includes a second body portion in the shape of an annular shape and a second extension portion in the shape of a cylinder that protrudes axially from the inner edge of the second body portion. The second extension portion is inserted and fixed to the first bearing, and the lever is formed by protruding outward from the periphery of the second body portion in the radial direction.

[0021] Preferably, the elastic element is a spring.

[0022] Compared with related technologies, the limiting mechanism of the present invention provides a lever on the periphery of the turntable and a rocker assembly consisting of a second bearing, a rocker arm, a slider, an elastic element, a moving magnet, and a fixed magnet on the base body. Limiting portions are provided on opposite sides of the slider along the circumference of the base body, spaced equidistantly from the slider. When the turntable rotates to approximately 180 degrees and the lever presses against the slider, it can push the slider to rotate to the corresponding limiting portion, thus limiting the lever. This achieves a limit on the turntable greater than 180 degrees. Upon reset, the lever disengages from the slider, and the slider rebounds under the action of the elastic element and resets under the magnetic force of the moving and fixed magnets. This prevents the rocker assembly from rotating back and forth on the base body, reducing noise and providing good stability. Furthermore, the limiting mechanism of the present invention uses mechanical limiting, which not only involves fewer actions and a simpler structure but also occupies less space and has high reliability. [Attached Image Description]

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0024] Figure 1 This is a three-dimensional structural diagram of a limiting mechanism provided in an embodiment of the present invention;

[0025] Figure 2 This is an exploded view of the structure of a limiting mechanism provided in an embodiment of the present invention;

[0026] Figure 3 for Figure 1 MM-line sectional view;

[0027] Figure 4 This is a plan view of the transfer platform of the limiting mechanism in its initial position, provided by an embodiment of the present invention.

[0028] Figure 5 This is a planar schematic diagram of a limiting mechanism when the turntable rotates to a position greater than 180 degrees and is limited, according to an embodiment of the present invention.

[0029] Figure 6 This is a planar schematic diagram of a limiting mechanism provided in an embodiment of the present invention, showing the turntable rotating to a greater than 180 degrees and then being limited.

[0030] In the diagram, 100 is the limiting mechanism; 1 is the base; 11 is the base body; 111 is the first body part; 112 is the first extension part; 113 is the first fixing groove; 114 is the second fixing groove; 12 is the through hole; 13 is the limiting part; 14 is the annular protrusion; 2 is the first bearing; 3 is the turntable; 31 is the turntable body; 311 is the second body part; 312 is the second extension part; 32 is the lever; 321 is the protrusion; 4 is the rocker assembly; 41 is the second bearing; 42 is the rocker; 421 is the first receiving groove; 422 is the first mounting post; 423 is the pin; 424 is the rotating shaft; 43 is the slider; 431 is the groove; 432 is the second receiving groove; 433 is the second mounting post; 434 is the guide groove; 435 is the third fixing groove; 44 is the elastic element; 45 is the moving magnet; and 46 is the fixed magnet.

Detailed Implementation Methods

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] This invention provides a limiting mechanism 100, combined with... Figures 1 to 3 As shown, it includes a base 1, a first bearing 2, a turntable 3, and a rocker assembly 4.

[0033] Specifically, the base 1 includes a base body 11 and a circular through hole 12 that penetrates the base body 11; the first bearing 2 is installed in the through hole 12 and forms a fixed connection with the base body 11.

[0034] The turntable 3 includes a turntable body 31 that is inserted into and fixedly connected to the first bearing 2 and is in the shape of an annulus, and a lever 32 that extends from the periphery of the turntable body 31. The turntable body 31 is rotatably connected to the base body 11 through the first bearing 2.

[0035] The rocker assembly 4 and the lever 32 are located on the same side of the base body 11. The rocker assembly 4 includes a second bearing 41 fixedly connected to the base body 11, a rocker 42 inserted into and fixedly connected to the second bearing 41, a slider 43 sleeved on the rocker 42 and slidably connected to it, an elastic element 44 connecting the rocker 42 and the slider 43, a moving magnet 45 fixed to the end of the slider 43 away from the rocker 42, and a fixed magnet 46 fixed to the base body 11 and opposite to the moving magnet 45. When the rocker 42 is in the initial position, it and the lever 32 are simultaneously located on the same straight line with the same diameter of the turntable body 31, and the slider 43 is spaced apart from the turntable body 31. The rocker 42 is rotatably connected to the base body 11 through the second bearing 41. The base body 11 is provided with limiting parts 13 that are equally spaced from the slider 43 on opposite sides of the slider 43 along its circumference.

[0036] When the lever 32 is rotated clockwise or counterclockwise to press against the slider 43, the lever 32 engages with the slider 43. The lever 32 continues to rotate to push the slider 43 to rotate and at the same time stretch the slider 43 along the axial direction of the lever 42 until the lever 32 rotates from the initial position to more than 180 degrees, so that the slider 43 abuts against the corresponding limiting part 13 to achieve limiting.

[0037] Among them, the rocker arm 42 is provided with a protruding rotating shaft 424 on the side near the base body 11, and the rocker arm 42 is inserted into the second bearing 41 through the rotating shaft 424 and forms a fixed connection with it.

[0038] The elastic element 44 is a spring. Of course, depending on the actual needs, the elastic element 44 can also be selected from components with elastic recovery, such as C-shaped springs or S-shaped springs.

[0039] In this embodiment, the base body 11 includes a cylindrical first body portion 111 and a first extension portion 112 extending from the periphery of the first body portion 111. A through hole 12 is formed in the first body portion 111, that is, the through hole 12 penetrates the central region of the first body portion 111. A second bearing 41 is fixedly connected to the first extension portion 112, that is, the rocker arm assembly 4 is disposed in the first extension portion 112, and its slider 43 can extend to the first body portion 111. By configuring the base body 11 as a first body portion 111 and a first extension portion 112, the mounting area of ​​the base body 11 can be increased to facilitate the spacing between the turntable 3 and the rocker arm assembly 4.

[0040] In this embodiment, the first body portion 111 is provided with an inwardly recessed first fixing groove 113, and the second bearing 41 is installed in the first fixing groove 113 and forms a fixed connection with the first body portion 111; the first body portion 111 is provided with an inwardly recessed second fixing groove 114, and the fixed magnet 46 is installed in the second fixing groove 114 and forms a fixed connection with the first body portion 111; the slider 43 is provided with an inwardly recessed third fixing groove 435 on the side near the first body portion 111, and the moving magnet 45 is installed in the third fixing groove 435 and forms a fixed connection with the slider 43. By installing the second bearing 41 in the inwardly recessed first fixing groove 113, the fixed magnet 46 in the inwardly recessed second fixing groove 114, and the moving magnet 45 in the inwardly recessed third fixing groove 435, the overall height of the limiting mechanism 100 can be reduced, that is, the height space occupied by the limiting mechanism 100 during application can be reduced, making it more applicable.

[0041] In this embodiment, the base 1 also includes an annular protrusion 14 that extends from the edge of the base body 11 and surrounds the through hole 12 and has a notch; the notch is directly opposite to the slider 43, and the planes on both sides of the notch serve as two limiting parts 13 located on opposite sides of the slider 43.

[0042] The annular protrusion 14 is specifically provided on the first body portion 111, and its notch is aligned with the extension direction of the first extension portion 112.

[0043] Of course, depending on actual needs, the limiting portions 13 on both sides of the slider 43 can also be directly extended from the first body portion 111 to form a column or block, and it is not necessary to form a ring structure with a notch.

[0044] In this embodiment, the turntable body 31 includes a ring-shaped second body portion 311 and a cylindrical second extension portion 312 that protrudes axially from the inner edge of the second body portion 311. That is, the turntable 3 has a hollow structure, which facilitates the passage of wire harnesses and avoids excessive twisting of the wire harnesses when the turntable 3 rotates. The second extension portion 312 is inserted and fixed to the first bearing 2 and extends outward through the through hole 12. The lever 32 protrudes radially outward from the periphery of the second body portion 311.

[0045] In this embodiment, the lever 32 has protruding protrusions 321 on its opposite sides; the slider 43 has inwardly recessed grooves 431 on its opposite sides that match the protrusions 321; when the lever 32 is rotated clockwise or counterclockwise to press against the slider 43, the lever 32 engages with the grooves 431 on the corresponding side of the slider 43 through the protrusions 321. This arrangement allows the lever 32 and the slider 43 to form a locking engagement, preventing the lever 32 from sliding when pressing against the slider 43.

[0046] In this embodiment, the rocker arm 42 is recessed inward on the side away from the base body 11 to form a first receiving groove 421. A protruding first mounting post 422 is provided at the end of the first receiving groove 421 away from the slider 43. A recessed second receiving groove 432 is provided on the side of the slider 43 near the base 1. A protruding second mounting post 433 is provided at the end of the second receiving groove 432 away from the rocker arm 42. The second receiving groove 432 covers the rocker arm 42 and forms a sliding connection with it. An elastic member 44 is received in the first receiving groove 421 and the second receiving groove 432, and both ends of the elastic member 44 are fixed to the first mounting post 422 and the second mounting post 433, respectively. This arrangement allows the elastic member 44 to be received between the rocker arm 42 and the slider 43, thereby reducing the height of the rocker arm assembly 4.

[0047] In addition, guide grooves 434 are respectively provided through both sides of the second receiving groove 432; two spaced pins 423 are respectively inserted into both sides of the first receiving groove 421, and the pins 423 extend into the guide grooves 434 on the corresponding sides to limit the sliding stroke of the slider 43. This arrangement allows the sliding stroke of the slider 43 to be controlled by the pins 423 pressing against the ends of the guide grooves 434.

[0048] In this embodiment, the sliding contact surfaces of the slider 43 and the rocker arm 42 are both treated with diamond-like carbon (DLC) coating. This design can effectively improve the hardness and wear resistance of the slider 43, thereby reducing the coefficient of friction between it and the rocker arm 42, thus improving the sliding performance of the slider 43 and reducing the rotational torque of the turntable 3.

[0049] The limiting mechanism 100 in this embodiment can be applied to mechanical structures that require rotation limiting, such as robot turntable 3 and rotating parts of desktop fans.

[0050] In this embodiment, the principle of the limiting mechanism 100 is as follows: When the turntable 3 is in the initial position, the lever 32 and the rocker assembly 4 of the turntable 3 are located on opposite sides of the turntable 3. When the turntable 3 starts to rotate and rotates to nearly 180 degrees, the protrusion 321 on the lever 32 will engage and press against the groove 431 on the slider 43. At this time, since the slider 43 and the rocker 42 are slidably connected and connected by a spring, the turntable 3 can still rotate to more than 180 degrees. That is, the lever 32 drives the slider 43 to rotate together until it exceeds 180 degrees. Then, the slider 43 will be unable to rotate under the pressing action of the limiting part 13 on its corresponding side, thereby completing the pressing and limiting of the turntable 3 to more than 180 degrees. When the turntable 3 needs to be reset, the protrusion 321 on the lever 32 will disengage from the groove 431 on the slider 43. At this time, the slider 43 will rebound under the action of the spring force, and the attitude of the slider 43 will be controlled to avoid shaking and reduce noise generation. At the same time, the slider 43 will be prevented from contacting the turntable 3 and causing wear. In addition, the slider 43 will be reset by the magnetic force of the fixed magnet 46, preventing the rocker arm assembly 4 from shaking left and right and colliding with the limiting part 13 to generate noise, so as to further reduce the generation of noise.

[0051] Combination Figures 4 to 6 As shown, Figure 4 This is a plan view of the limiting mechanism 100 with the transfer platform 3 in its initial position, provided in an embodiment. Figure 5 This is a plan view of the limiting mechanism 100 provided in this embodiment when the turntable 3 rotates to a forward position greater than 180 degrees and is limited. Figure 6 This is a plan view of a limiting mechanism 100 when the turntable 3 is reversed to a degree greater than 180 degrees and limited, as provided in the embodiment; the specific limiting distance is as follows:

[0052] like Figure 4 As shown, when the turntable 3 is in the initial position, the lever 32 is in position A, and the slider 43 is in position B under the action of the spring, the moving magnet 45 and the fixed magnet 46.

[0053] like Figure 5As shown, during the process of the turntable 3 rotating clockwise to more than 180 degrees, the protrusion 321 of the lever 32 engages with the groove 431 of the slider 43, pushing the slider 43 to move from position B to position B1 along the rotation direction of the lever 32. During this process, the rocker assembly 4 rotates around direction D1 (counterclockwise direction of the axis 424), and the slider 43 slides along direction C1. At the same time, the limiting part 13 on the corresponding side of the base body 11 prevents the slider 43 from moving further to the right, thus locking the movement of the slider 43. The locking of the slider 43 restricts the further movement of the turntable 3. The turntable rotates forward, causing the lever 32 of the turntable 3 to be in position A1, thereby limiting the turntable 3 to rotate forward by more than 180 degrees. During the process of the turntable 3 returning to position A (reset), the protrusion 321 of the lever 32 disengages from the groove 431 of the slider 43 and returns to position A. Under the action of the spring, the slider 43 slides back to its initial position in the opposite direction of C1. At the same time, the fixed magnet 46 on the base body 11 attracts the moving magnet 45 on the slider 43, so that the rocker assembly 4 returns to its initial position. Finally, the slider 43 returns from position B1 to position B, thus achieving position constraint on the slider 43.

[0054] like Figure 6 As shown, during the process of the turntable 3 rotating counterclockwise to more than 180 degrees, the protrusion 321 of the lever 32 engages with the groove 431 of the slider 43, pushing the slider 43 to move from position B to position B2 along the rotation direction of the lever 32. During this process, the rocker assembly 4 rotates around the D2 direction (clockwise direction of the pivot 424), and the slider 43 slides along the C2 direction. At the same time, the limiting part 13 on the corresponding side of the base body 11 prevents the slider 43 from moving further to the left, thus locking the movement of the slider 43. The locking of the slider 43 restricts the further movement of the turntable 3. Reversing the rotation causes the lever 32 of the turntable 3 to be in position A2, thereby limiting the forward rotation of the turntable 3 to more than 180 degrees. During the process of the turntable 3 returning to position A (resetting), the protrusion 321 of the lever 32 disengages from the groove 431 of the slider 43 and returns to position A. Under the action of the spring, the slider 43 slides back to its initial position in the opposite direction of C2. At the same time, the fixed magnet 46 on the base body 11 attracts the moving magnet 45 on the slider 43, so that the rocker assembly 4 returns to its initial position. Finally, the slider 43 returns from position B2 to position B, thus achieving position constraint on the slider 43.

[0055] Compared with related technologies, the limiting mechanism 100 of this embodiment provides a lever 32 around the turntable 3, and a rocker assembly 4 consisting of a second bearing 41, a rocker arm 42, a slider 43, an elastic element 44, a moving magnet 45, and a fixed magnet 46 on the base body 11. Limiting portions 13 are provided on opposite sides of the slider 43 along the circumference of the base body 11, spaced equidistant from the slider 43. Thus, when the turntable 3 rotates to approximately 180 degrees and the lever 32 presses against the slider 43, it can push the slider 43 to rotate to the position where it is aligned with the rocker arm 42. The corresponding limiting part 13 presses against the turntable 32, thereby limiting the turntable 3 to a greater than 180 degrees. When resetting, the turntable 32 disengages from the slider 43, and the slider 43 rebounds under the action of the elastic element 44 and resets under the magnetic force of the moving magnet 45 and the fixed magnet 46, so that the rocker arm assembly 4 will not rotate back and forth on the base body 11, thereby reducing noise generation and improving stability. In addition, the limiting mechanism 100 of the present invention adopts mechanical limiting, which not only has fewer actions and simple structure, but also occupies less space and has high reliability.

[0056] The above description is merely an embodiment of the present invention. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of the present invention, but these improvements all fall within the protection scope of the present invention.

Claims

1. A limiting mechanism for achieving forward and reverse rotation exceeding 180 degrees, characterized in that, The limiting mechanism includes: A base, the base including a base body and a circular through hole penetrating the base body; A first bearing is installed in the through hole and is fixedly connected to the base body; The turntable includes a turntable body that is inserted into and fixedly connected to the first bearing and is in the shape of an annulus, and a lever that extends from the periphery of the turntable body. The turntable body is rotatably connected to the base body through the first bearing. A rocker assembly, wherein the rocker assembly and the lever are disposed on the same side of the base body; the rocker assembly includes a second bearing fixedly connected to the base body, a rocker arm inserted into and fixedly connected to the second bearing, a slider sleeved on and slidably connected to the rocker arm, an elastic element connected between the rocker arm and the slider, a moving magnet fixed to the end of the slider away from the rocker arm, and a fixed magnet fixed to the base body and disposed opposite to the moving magnet. When the rocker arm is in its initial position, it and the lever are simultaneously located on a straight line with the same diameter of the turntable body, and the slider is spaced apart from the turntable body. The rocker arm is rotatably connected to the base body through the second bearing; the base body is provided with limiting portions on opposite sides of the slider along its circumference, which are equally spaced from the slider. When the lever is rotated clockwise or counterclockwise to press against the slider, the lever engages with the slider; the lever continues to rotate to push the slider to rotate and at the same time stretch the slider along the axial direction of the rocker arm, until the lever rotates from the initial position to more than 180 degrees, causing the slider to abut against the limiting part on the corresponding side to achieve limitation.

2. The limiting mechanism as described in claim 1, characterized in that, The base also includes an annular protrusion extending from the edge of the base body and surrounding the through hole, and having a notch; the notch is directly opposite the slider, and the planes on both sides of the notch serve as two limiting portions located on opposite sides of the slider.

3. The limiting mechanism as described in claim 1, characterized in that, The lever has protruding protrusions on its opposite sides; the slider has inwardly recessed grooves on its opposite sides that match the protrusions; when the lever is rotated clockwise or counterclockwise to press against the slider, the lever engages with the groove on the corresponding side of the slider through the protrusions.

4. The limiting mechanism as described in claim 1, characterized in that, The rocker arm is recessed inward on the side away from the base body to form a first receiving groove, and a first mounting post is provided at the end of the first receiving groove away from the slider; a second receiving groove is provided inward on the side of the slider close to the base, and a second mounting post is provided at the end of the second receiving groove away from the rocker arm; the second receiving groove covers the rocker arm and forms a sliding connection with it; the elastic member is received in the first receiving groove and the second receiving groove, and the two ends of the elastic member are respectively fixed to the first mounting post and the second mounting post.

5. The limiting mechanism as described in claim 4, characterized in that, Guide grooves are provided through both sides of the second receiving groove; two spaced pins are inserted into both sides of the first receiving groove, and the pins extend into the guide grooves on the corresponding sides to limit the sliding stroke of the slider.

6. The limiting mechanism as described in claim 1, characterized in that, The sliding contact surfaces of the slider and the rocker are both treated with diamond-like carbon coating.

7. The limiting mechanism as described in claim 1, characterized in that, The base body includes a cylindrical first body portion and a first extension portion formed by protruding from the periphery of the first body portion. The through hole is formed in the first body portion, and the second bearing is fixedly connected to the first extension portion.

8. The limiting mechanism as described in claim 7, characterized in that, The first body portion is provided with an inwardly recessed first fixing groove, and the second bearing is installed in the first fixing groove and forms a fixed connection with the first body portion; the first body portion is provided with an inwardly recessed second fixing groove, and the fixed magnet is installed in the second fixing groove and forms a fixed connection with the first body portion; the slider is provided with an inwardly recessed third fixing groove on the side near the first body portion, and the moving magnet is installed in the third fixing groove and forms a fixed connection with the slider.

9. The limiting mechanism as described in claim 1, characterized in that, The turntable body includes a second body portion in the shape of an annulus and a second extension portion in the shape of a cylinder that protrudes axially from the inner edge of the second body portion. The second extension portion is inserted and fixed to the first bearing. The lever is formed by protruding outward from the periphery of the second body portion in the radial direction.

10. The limiting mechanism as described in claim 1, characterized in that, The elastic element is a spring.

Images