Adjusting protection mechanism of lower limb strength training device

Abstract

The present application relates to the field of fitness equipment, and specifically, the present application provides a kind of lower limb strength training device adjusting protection mechanism, adjusting protection mechanism includes: adjusting handle, rotatably arranged in the carrying frame component;Traction component, including traction sleeve, traction core and sliding buffer part, the fixed end of traction sleeve is connected to the carrying frame component, the acting end of traction sleeve is connected to sliding buffer part;Traction core is slidably arranged in traction sleeve, and its fixed end is connected to adjusting handle;Linkage component, the acting end of traction core is fixedly connected to limiting frame by linkage component;When limiting frame is in locked state, operating adjusting handle drives traction sleeve and traction core to generate relative displacement, and buffer stroke is formed by sliding buffer part, so that limiting frame remains locked state;When limiting frame is in adjusting state, operating adjusting handle drives traction core to drive linkage component to pull limiting frame, so that limiting frame is reset from the adjusting state to the locked state.

Description

Technical Field

[0001] This invention relates to the field of fitness equipment technology, and more specifically, to an adjustment and protection mechanism for a lower limb strength training device. Background Technology

[0002] In existing lower limb strength training equipment, especially plate-type devices such as height-adjustable squat machines, the swing frame limiting mechanism is usually located at the bottom of the machine. This structure, placing the adjustment handle near the user's feet, not only affects the overall aesthetics of the equipment but also poses a significant safety hazard. Because the handle is positioned low, the user can easily touch the adjustment lever during training, causing the limiting frame to suddenly detach, resulting in the swing frame falling uncontrollably and causing injury to the user or those nearby.

[0003] Meanwhile, existing swing frame limiting mechanisms mostly use rigid connections or direct transmissions between the adjustment handle and the limiting frame, lacking a protection mechanism in case of misoperation. This deficiency limits the safety and reliability of the adjustment mechanism and fails to meet users' growing safety demands for fitness equipment.

[0004] Therefore, there is an urgent need to develop an adjustment and protection mechanism for lower limb strength training devices that has anti-accidental touch function and can achieve safe adjustment and reset. Summary of the Invention

[0005] This invention provides an adjustment and protection mechanism for a lower limb strength training device, which at least solves the safety problems caused by the unreasonable position setting of the swing frame limit mechanism and the lack of a misoperation protection mechanism in the prior art.

[0006] To achieve the above objectives, in a first aspect, the present invention provides an adjustment and protection mechanism for a lower limb strength training device. The lower limb strength training device includes a support frame assembly rotatably mounted on a base frame and a limiting frame rotatably mounted on the support frame assembly. The limiting frame has a locked state engaged with the base frame and an adjustable state disengaged from the base frame. The adjustment and protection mechanism includes: An adjustment handle is rotatably positioned above the support assembly; The traction assembly includes a traction sleeve, a traction core, and a sliding buffer portion. The fixed end of the traction sleeve is connected to the support frame assembly, and the active end of the traction sleeve is connected to the sliding buffer portion. The traction core is slidably inserted through the traction sleeve, and its fixed end is connected to the adjustment handle. The linkage component, wherein the working end of the traction core is fixedly connected to the limiting frame through the linkage component; When the limiting frame is in the locked state, operating the adjusting handle drives the traction sleeve and the traction core to generate relative displacement, and the sliding buffer part forms a buffer stroke so that the limiting frame can still maintain the locked state when the adjusting handle is accidentally operated. When the limiting frame is in the adjustment state, the adjustment handle is operated to drive the traction core to pull the limiting frame, so that the limiting frame is reset from the adjustment state to the locked state.

[0007] Furthermore, the sliding buffer includes: A guide sleeve assembly is fixedly disposed on the support assembly, and the guide sleeve assembly has a receiving cavity; A sliding sleeve is slidably disposed within the accommodating cavity, and the sliding sleeve has an installation cavity; the functional end of the traction sleeve is connected to the sliding sleeve; An elastic element is disposed within the mounting cavity, with one end abutting against the limiting surface of the mounting cavity and the other end extending out of the mounting cavity and abutting against the limiting surface of the receiving cavity; When the traction sleeve drives the sliding sleeve to slide relative to the guide sleeve assembly, the elastic element is compressed or released to provide a cushioning force.

[0008] Furthermore, the guide sleeve assembly includes: Guide sleeve; The adapter has one end inserted into and fixed to the guide sleeve to form the limiting surface of the accommodating cavity, and the other end fixed to the support assembly; the adapter has a central through hole along its axial direction.

[0009] Furthermore, the linkage component includes: The pin is fixed to the working end of the traction core and can be slidably inserted into the central through hole of the adapter. The linkage has one end connected to the pin and the other end connected to the limiting frame.

[0010] Furthermore, the working end of the traction core passes through the mounting cavity of the sliding sleeve and the central through hole of the adapter in sequence, and is fixedly connected to the pin portion; When the limiting frame is in the adjustment state, operating the adjustment handle causes the traction core to drive the pin portion to slide along the central through hole, thereby driving the limiting frame to reset from the adjustment state to the locked state through the linkage.

[0011] Furthermore, it also includes an elastic drive member, one end of which is fixed to the support assembly and the other end is connected to the limiting frame, for applying an elastic force to the limiting frame to move the limiting frame from the locked state to the adjusted state.

[0012] Furthermore, the elastic driving element is a gas spring, and the gas spring includes: The cylinder is fixed to the support assembly; The piston rod has one end located inside the cylinder and the other end connected to the limiting frame.

[0013] Furthermore, the latch portion includes: A fastener is fixed to the working end of the traction core, and the fastener has an external thread on its outer periphery. A pin has a threaded hole that mates with the external thread, and the fastener is screwed to the pin through the threaded hole.

[0014] Furthermore, a limiting sleeve is provided on the rotation path of the adjusting handle to limit the rotation angle of the adjusting handle.

[0015] In a second aspect, the present invention provides a lower limb strength training device, which applies the adjustment and protection mechanism of the lower limb strength training device as described in the first aspect.

[0016] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: This invention avoids the risk of accidental contact due to the handle being too low by placing the adjustment handle above the support frame assembly. At the same time, by utilizing the synergistic effect of the traction component and the sliding buffer, when the limit frame is in the locked state, accidental operation of the adjustment handle will only drive the elastic element to compress and form a buffer stroke, without directly triggering the limit frame to disengage. This effectively prevents the swing frame from falling accidentally due to accidental contact, greatly enhancing the safety of the equipment.

[0017] This invention automatically switches the transmission mode of the mechanism by changing the relative position of the support assembly and the adjustment handle. In the locked state, it exhibits flexible buffering, while in the adjustment state, it switches to rigid transmission. This design allows the mechanism to automatically adapt to the training state, ensuring both safety protection functions and effective force transmission during adjustment and reset, thus improving the reliability and ease of operation of the mechanism.

[0018] This invention employs a transmission method combining a traction sleeve, a traction core, and a sliding buffer, offering flexible layout and making it particularly suitable for fitness equipment with high space requirements. While achieving complex functions, it ensures structural simplicity and reliability, balancing production costs and usage efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a lower limb strength training device according to an exemplary embodiment of the present invention; Figure 2 This is a schematic diagram of the adjustment and protection mechanism of a lower limb strength training device according to an exemplary embodiment of the present invention; Figure 3 This is a cross-sectional view of the adjustment and protection mechanism of a lower limb strength training device according to an exemplary embodiment of the present invention.

[0020] In the above image: 1. Base frame; 2. Frame assembly; 21. Swing frame; 22. Shoulder support; 23. Load-bearing frame; 24. Limiting frame; 25. Limiting groove; 26. Gas spring; 241. Guide pin; 242. Limiting plate; 243. Guide groove; 3. Adjusting handle; 31. Limiting sleeve; 32. Tension spring; 4. Traction assembly; 41. Traction sleeve; 42. Traction core; 43. Guide sleeve assembly; 44. Sliding sleeve; 45. Elastic element; 46. Guide sleeve; 47. Adapter; 48. Central through hole; 5. Linkage components; 51. Fasteners; 52. Pins; 53. Linkage parts; 6. Pedal. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] In the description of this application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "level," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the referred mechanism or element must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0023] In the description of this application, it should be noted that, unless otherwise expressly 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 between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] The following is in conjunction with the appendix Figures 1-3 The technical solution of this embodiment is described in detail. Unless otherwise specified, the following implementation methods and embodiments can be combined with each other.

[0025] In existing lower limb strength training equipment, especially plate-type devices such as height-adjustable squat machines, the swing frame limiting mechanism is usually located at the bottom of the machine. Because the handles are positioned low, users can easily accidentally touch the adjustment rod during training, causing the limiting frame to suddenly detach and creating a safety hazard.

[0026] Therefore, the present invention provides an adjustment and protection mechanism for a lower limb strength training device, which has an anti-accidental touch function and can realize the safe adjustment and reset of the limit frame.

[0027] Figure 1 To illustrate the structure of the lower limb strength training device according to the present invention, the following is a detailed description... Figure 1 The main structure of the lower limb strength training device will be described in detail.

[0028] The lower limb training device consists of a base frame 1, a support frame assembly 2, and a foot pedal 6.

[0029] The base frame 1 is set on a bearing plane, and the support frame assembly 2 is rotatably set on the base frame 1 through a pivot point. The support frame assembly 2 has a shoulder support part 22, and the footboard 6 is set on the base frame 1. The top surface of the footboard 6 forms a height difference with respect to the bearing plane to carry out lower limb strength training.

[0030] In some embodiments, the support frame assembly 2 includes a swing frame 21, a load-bearing frame 23, and a limiting frame 24.

[0031] The swing frame 21 is rotatably mounted on the base frame 1, and one end of the swing frame 21 has a shoulder support 22.

[0032] The weighted frame 23 is fixed on the swing frame 21 and can swing relative to the base frame 1 with the swing frame 21. It is used to hang counterweight plates and provide adjustable resistance for lower limb strength training.

[0033] A guide pin 241 is fixed on the limiting frame 24. The limiting plate 242 is fixed on one side of the limiting frame 24, and the guide pin 241 is inserted into the guide groove 243 of the limiting plate 242 so that the limiting frame 24 can swing within a fixed angle.

[0034] Preferably, the guide groove 243 on the limiting plate 242 is opened along the swing path of the limiting frame 24, so that when the guide pin 241 slides in the guide groove 243, it can limit the swing angle of the limiting frame 24 within a preset fixed range and prevent it from overturning.

[0035] When not training, the limit frame 24 is in a locked state and is engaged in the limit groove 25 of the base frame 1. At this time, the swing frame 21 is fully restrained, providing a stable preset training starting position for training.

[0036] During training, the user places one foot on the top surface of pedal 6, extends their hip diagonally upward, and pushes against shoulder rest 22 to rotate around the pivot point for step-up and Bulgarian split squat training. At this time, the limiting frame 24 rises as the swing frame 21 swings upward, completely separating from the limiting groove 25 and maintaining it in the unlocked position, thus allowing the swing frame 21 to rotate freely to accommodate the training movements. At this point, the limiting frame 24 is in the adjustment state.

[0037] Figure 2 The following is a schematic diagram of the adjustment and protection mechanism of the lower limb strength training device according to the present invention, in conjunction with... Figures 1-2 This section provides a detailed explanation of the adjustment and protection mechanism of the lower limb strength training device.

[0038] The adjustment and protection mechanism of the lower limb strength training device includes an adjustment handle 3, a traction component 4, and a linkage component 5.

[0039] The adjustment handle 3 is rotatably mounted above the support assembly 2.

[0040] In some embodiments, the adjustment handle 3 is rotatably mounted above the shoulder support 22 via a pivot point. A limiting sleeve 31 is provided on one side of the pivot point, i.e., on the rotation path of the adjustment handle 3, to limit the maximum rotation angle of the adjustment handle 3 and prevent over-operation. A tension spring 32 is connected to the shoulder support 22 at the end of the adjustment handle 3 away from the operating end. The tension spring provides an automatic reset torque for the adjustment handle 3 through its elastic tension, and ensures that the adjustment handle 3 remains stable in its initial position when not in operation.

[0041] The traction assembly 4 includes a traction sleeve 41, a traction core 42, and a sliding buffer. The fixed end of the traction sleeve 41 is connected to the support assembly 2, and the active end of the traction sleeve 41 is connected to the sliding buffer. The traction core 42 is slidably inserted through the traction sleeve 41, and its fixed end is connected to the adjusting handle 3. The active end of the traction core 42 is fixed to the limiting frame 24 through the linkage assembly 5.

[0042] When the limit frame 24 is in the locked state, the operation of the adjustment handle 3 drives the traction sleeve 41 and the traction core 42 to generate relative displacement, and forms a buffer stroke through the sliding buffer part, so that the limit frame 24 can still remain in the locked state in the event of misoperation of the adjustment handle 3.

[0043] When the limit frame 24 is in the adjustment state, the operation of the adjustment handle 3 drives the traction core 42 to drive the linkage component 5 to pull the limit frame 24 so that the limit frame 24 is engaged with the limit groove 25 of the base frame 1, and the limit frame 24 is reset from the adjustment state to the locked state.

[0044] In some embodiments, such as Figure 3 As shown, the sliding buffer includes a guide sleeve assembly 43, a sliding sleeve 44, and an elastic element 45.

[0045] The guide sleeve assembly 43 is fixedly mounted on the support assembly 2, and the guide sleeve assembly 43 has a receiving cavity; the sliding sleeve 44 is slidably disposed in the receiving cavity, and the sliding sleeve 44 has a mounting cavity; the working end of the traction sleeve 41 is connected to the sliding sleeve 44; the elastic element 45 is disposed in the mounting cavity, one end of which abuts against the limiting surface of the mounting cavity, and the other end extends out of the mounting cavity and abuts against the limiting surface of the receiving cavity. When the traction sleeve 41 drives the sliding sleeve 44 to slide relative to the guide sleeve assembly 43, the elastic element 45 is compressed or released to provide a buffering force.

[0046] Preferably, the outer diameter of the sliding sleeve 44 and the inner diameter of the receiving cavity are precisely clearance-fitted to ensure smooth reciprocating movement of the sliding sleeve 44 within the receiving cavity and effectively prevent uneven wear. The length of the mating working surface between the sliding sleeve 44 and the receiving cavity is slightly greater than the length of the sliding sleeve 44 to ensure guiding stability during movement.

[0047] In some embodiments, the adjustment and protection mechanism of the lower limb strength training device further includes an elastic drive component, one end of which is fixed to the support frame 2 and the other end is connected to the limiting frame 24, for applying an elastic force to the limiting frame 24 to move the limiting frame 24 from the locked state to the adjustment state.

[0048] In some embodiments, the elastic drive element is a gas spring 26, which includes a cylinder and a piston rod.

[0049] The cylinder is fixed to the support assembly 2; one end of the piston rod is located inside the cylinder, and the other end is connected to the limit frame 24.

[0050] Preferably, when the limiting frame 24 is in the locked state, the gas spring 26 is in the compressed state; when the limiting frame 24 is in the adjustable state, the gas spring 26 releases its elastic force to drive the limiting frame 24 to swing, ensuring that it is completely separated from the limiting groove 25 on the base frame 1 and maintained in the unlocked position.

[0051] In some embodiments, such as Figures 1-3 As shown, when the limit frame 24 is in the locked state and the adjustment handle 3 is not operated, the elastic element 45 is in the natural state; when the adjustment handle 3 is operated, the traction sleeve 41 and the traction core 42 are driven to generate relative displacement, the traction sleeve 41 drives the sliding sleeve 44 to slide in the receiving cavity of the guide sleeve assembly 43, and compresses the elastic element 45 to form a buffer stroke so that the limit frame 24 remains in the locked state.

[0052] Preferably, when the limiting frame 24 is in the locked state, it is engaged in the limiting groove 25 of the base frame 1. At this time, the swing frame 21 is fully constrained, providing a stable preset training starting position for training. When the adjusting handle 3 is not operated, the elastic element 45 is in its natural state, and the traction sleeve 41 and the traction core 42 have relative displacement space. At this time, the adjusting protection mechanism is in a stable standby state.

[0053] When the user presses the adjusting handle 3 while the limiting frame 24 is locked, for example, if the adjusting handle 3 is accidentally pressed, the adjusting handle 3 rotates around the shoulder support 22. This rotation causes the traction core 42 to generate axial tension through its fixed end. Since the limiting frame 24 is locked at this time, it is engaged in the limiting groove 25 of the base frame 1, which restricts the action end of the traction core 42 that is fixed to the limiting frame 24 via the linkage assembly 5.

[0054] The traction core 42 is in a restricted state, which converts the axial tension of the traction core 42 into a reaction force on the traction sleeve 41, pushing the traction sleeve 41 to drive the sliding sleeve 44 to slide within the receiving cavity of the guide sleeve assembly 43. The movement of the sliding sleeve 44 compresses the elastic element 45, causing it to enter a compressed state from its natural state. The stroke of the sliding sleeve 44 within the receiving cavity can be regarded as a buffer stroke.

[0055] When the operating force is released, the compressed elastic element 45 releases its potential energy, pushing all components to reset. This ensures that, in the locked state, accidental operation of the adjusting handle 3 will not cause the limit frame 24 to disengage, thus achieving fundamental safety protection.

[0056] During this process, the mechanical energy of the operating adjustment handle 3 is continuously converted into the elastic potential energy of the elastic element 45 and stored and released. As long as the limit frame 24 remains locked, this buffer stroke can be continuously generated, thereby effectively preventing the formation of a direct pulling force at the action end of the traction core 42 that is sufficient to pull the limit frame 24 out of the limit groove 25, and preventing the safety hazard caused by accidental contact leading to the dislocation of the support assembly 2.

[0057] In some embodiments, such as Figures 1-3As shown, when the limiting frame 24 is in the adjustment state, the gas spring 26 releases its elastic force to push the limiting frame 24 to swing backward. The limiting frame 24 drives the linkage component 5 to pull the traction core 42. The traction core 42 squeezes the traction sleeve 41 through its fixed end, causing the traction sleeve 41 to drive the sliding sleeve 44 to slide within the guide sleeve assembly 43 and compress the elastic element 45. When the limiting frame 24 swings to the unlocked position, the elastic element 45 is in the maximum compression state, and the sliding sleeve 44 abuts against the inner wall of the end of the accommodating cavity of the guide sleeve assembly 43. That is, at this time, there is no relative displacement space between the traction core 42 and the traction sleeve 41. At this time, operating the adjustment handle 3 drives the traction core 42 to directly drive the linkage component 5 to pull the limiting frame 24, so that the limiting frame 24 returns from the adjustment state to the locked state.

[0058] Preferably, when the user wants to restore the limiting frame 24 to the locked state after training so that the support assembly 2 is relocked to the initial position, that is, when the limiting frame 24 is in the adjusted state and the adjusting handle 3 is pressed down, the rotation of the adjusting handle 3 directly acts on the traction core 42, generating an axial tensile force. Since the sliding sleeve 44 has abutted against the guide sleeve 46 to form a rigid support, there is no relative displacement space between the traction core 42 and the traction sleeve 41. This tensile force can no longer be absorbed by the buffer stroke, but is directly and effectively transmitted to the limiting frame 24 through the traction core 42 driving the linkage assembly 5, driving it to swing, thereby reliably resetting from the adjusted state to the locked state. In some embodiments, such as Figure 2 and Figure 3 As shown, the guide sleeve assembly 43 includes a guide sleeve 46 and an adapter 47.

[0059] The guide sleeve 46 has a cylindrical structure. One end of the adapter 47 is inserted into and fixed to the guide sleeve 46 to form a limiting surface for accommodating the cavity. The other end of the adapter 47 is fixed to the support assembly 2. The adapter 47 has a central through hole 48 along its axial direction.

[0060] Preferably, the limiting surface of the adapter 47 is an annular concave platform, providing a stable and flat axial contact for the elastic element 45. The other end of the adapter 47 is fixed to the load-bearing beam of the load-bearing frame 23 through a threaded joint, thereby realizing the reliable installation of the entire guide sleeve assembly 43 on the support frame assembly 2.

[0061] In some embodiments, such as Figure 2 and Figure 3 As shown, the linkage component 5 includes a pin and a linkage part 53.

[0062] The pin is fixed to the working end of the traction core 42 and can slide through the central through hole 48 of the adapter 47; one end of the linkage 53 is connected to the pin and the other end is connected to the limit frame 24.

[0063] Preferably, the linkage 53 can be a chain link, with its two ends respectively connected to the pin and the limiting frame 24 by pins to form a hinge connection, so as to adapt to the swing trajectory of the limiting frame 24 during the reset process.

[0064] In some embodiments, such as Figure 2 and Figure 3 As shown, the working end of the traction core 42 passes through the mounting cavity of the sliding sleeve 44 and the central through hole 48 of the adapter 47 in sequence, and is fixedly connected to the pin part; when the limit frame 24 is in the adjustment state, the adjustment handle 3 is operated, and the traction core 42 drives the pin part to slide along the central through hole 48, so as to drive the limit frame 24 from the adjustment state to the locked state through the linkage 53.

[0065] Preferably, when the limiting frame 24 is in the adjustment state, operating the adjustment handle 3 causes the pulling force acting on the traction core 42 to be directly transmitted to the linkage 53 through the sliding guide structure formed by the pin and the central through hole 48 of the adapter 47, instead of being dissipated by the buffer stroke. The linkage 53 drives the limiting frame 24 to swing around its rotation center until its end engages in the limiting groove 25 of the base frame 1, completing the reset. The central through hole 48 of the adapter 47 not only provides a sliding guide for the pin but also ensures the reliability of the pulling force transmission path.

[0066] In some embodiments, such as Figure 3 As shown, the pin part includes a fastener 51 and a pin 52.

[0067] Fastener 51 is fixed to the working end of traction core 42, and the outer periphery of fastener 51 is provided with external thread; pin 52 is provided with threaded hole that matches the external thread, and fastener 51 is screwed to pin 52 through threaded hole.

[0068] Secondly, the present invention provides a lower limb strength training device, employing the adjustment and protection mechanism of the lower limb strength training device as described in the first aspect. The lower limb strength training device can be a squat trainer or a step-up trainer, etc.

[0069] It should be noted that the adjustment and protection mechanism of the lower limb strength training device provided by the present invention can be applied to various strength training devices that require limiting and safety protection, and is not limited to the lower limb strength training devices listed in the above embodiments.

[0070] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. An adjustment and protection mechanism for a lower limb strength training device, characterized in that, The lower limb strength training device includes a support frame assembly rotatably mounted on a base frame and a limiting frame rotatably mounted on the support frame assembly. The limiting frame has a locked state engaged with the base frame and an adjustable state disengaged from the base frame. The adjustment and protection mechanism includes: An adjustment handle is rotatably positioned above the support assembly; The traction assembly includes a traction sleeve, a traction core, and a sliding buffer portion. The fixed end of the traction sleeve is connected to the support frame assembly, and the active end of the traction sleeve is connected to the sliding buffer portion. The traction core is slidably inserted through the traction sleeve, and its fixed end is connected to the adjustment handle. The linkage component, wherein the working end of the traction core is fixedly connected to the limiting frame through the linkage component; When the limiting frame is in the locked state, operating the adjusting handle drives the traction sleeve and the traction core to generate relative displacement, and the sliding buffer part forms a buffer stroke so that the limiting frame can still maintain the locked state when the adjusting handle is accidentally operated. When the limiting frame is in the adjustment state, the adjustment handle is operated to drive the traction core to pull the limiting frame, so that the limiting frame is reset from the adjustment state to the locked state.

2. The adjustment and protection mechanism of the lower limb strength training device according to claim 1, characterized in that, The sliding buffer includes: A guide sleeve assembly is fixedly disposed on the support assembly, and the guide sleeve assembly has a receiving cavity; A sliding sleeve is slidably disposed within the receiving cavity, and the sliding sleeve has an installation cavity; the working end of the traction sleeve is connected to the sliding sleeve; An elastic element is disposed within the mounting cavity, with one end abutting against the limiting surface of the mounting cavity and the other end extending out of the mounting cavity and abutting against the limiting surface of the receiving cavity; When the traction sleeve drives the sliding sleeve to slide relative to the guide sleeve assembly, the elastic element is compressed or released to provide a cushioning force.

3. The adjustment and protection mechanism of the lower limb strength training device according to claim 2, characterized in that, The guide sleeve assembly includes: Guide sleeve; The adapter has one end inserted into and fixed to the guide sleeve to form the limiting surface of the accommodating cavity, and the other end fixed to the support assembly; the adapter has a central through hole along its axial direction.

4. The adjustment and protection mechanism of the lower limb strength training device according to claim 3, characterized in that, The linkage component includes: The pin is fixed to the working end of the traction core and slidably passes through the central through hole of the adapter. The linkage has one end connected to the pin and the other end connected to the limiting frame.

5. The adjustment and protection mechanism of the lower limb strength training device according to claim 4, characterized in that, The working end of the traction core passes through the mounting cavity of the sliding sleeve and the central through hole of the adapter in sequence, and is fixedly connected to the pin part. When the limiting frame is in the adjustment state, operating the adjustment handle causes the traction core to drive the pin portion to slide along the central through hole, thereby driving the limiting frame to reset from the adjustment state to the locked state through the linkage.

6. The adjustment and protection mechanism of the lower limb strength training device according to claim 1, characterized in that, It also includes an elastic drive member, one end of which is fixed to the support assembly and the other end is connected to the limiting frame, for applying an elastic force to the limiting frame to move the limiting frame from the locked state to the adjusted state.

7. The adjustment and protection mechanism of the lower limb strength training device according to claim 6, characterized in that, The elastic driving component is a gas spring, and the gas spring includes: The cylinder is fixed to the support assembly; The piston rod has one end located inside the cylinder and the other end connected to the limiting frame.

8. The adjustment and protection mechanism of the lower limb strength training device according to claim 4, characterized in that, The latch includes: A fastener is fixed to the working end of the traction core, and the fastener has an external thread on its outer periphery. A pin has a threaded hole that mates with the external thread, and the fastener is screwed to the pin through the threaded hole.

9. The adjustment and protection mechanism of the lower limb strength training device according to claim 1, characterized in that, The adjustment handle has a limiting sleeve along its rotation path to limit the rotation angle of the adjustment handle.

10. A lower limb strength training device, characterized in that, The adjustment and protection mechanism of the lower limb strength training device as described in any one of claims 1-9 is applied.

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