Ligament stretching trainer for athletes

Abstract

The invention discloses a ligament stretching training device for athletes, and particularly relates to the technical field of sports equipment, the ligament stretching training device comprises a base mechanism, the base mechanism comprises a base plate, self-locking universal wheels arranged at the bottom of the base plate and a supporting leg assembly, and the height of the supporting leg assembly can be adjusted so that the self-locking universal wheels can leave the ground; the leg stretching mechanism and the height positioning mechanism are arranged on the base mechanism, a horizontal adjusting mechanism capable of horizontally moving is arranged on the leg stretching mechanism, and a secondary stretching mechanism is arranged on the horizontal adjusting mechanism. According to the ligament stretching training device for the athletes, a servo motor drives a lead screw mechanism to achieve accurate control over lifting and translation, and the stretching angle, height and position of the legs and the arms can be accurately adjusted in a multi-dimensional mode; the problems that in a traditional stretching mode, the stretching strength and angle are difficult to stably control, and the traditional stretching mode depends on human experience are effectively solved, and the scientificity and repeatability of stretching training are improved.

Description

Technical Field

[0001] This invention relates to the field of sports equipment technology, and in particular to a ligament stretching training device for athletes. Background Technology

[0002] Ligament stretching is a crucial part of athletes' daily training and pre- and post-exercise warm-up and cool-down, playing a vital role in improving joint flexibility, preventing sports injuries, and promoting fatigue recovery. Currently, athletes primarily rely on the following methods and equipment for ligament stretching: Traditional passive stretching methods rely primarily on external force provided by coaches, teammates, or the athlete's own arms, legs, or other limbs, or on fixed objects such as railings or walls as support points. This method has significant drawbacks: the magnitude, angle, and stability of the applied force are difficult to control precisely, depending on the assistant's experience, and there is a risk of overstretching leading to ligament and muscle strains; furthermore, the stretching angle is limited, failing to provide multi-dimensional and precise stretching for specific ligaments, resulting in low training efficiency and a lack of repeatable measurement standards. Simple stretching aids: Some simple stretching bands, elastic bands, or leg spreaders with markings exist on the market. These achieve stretching through the band body and length adjustment mechanism. While these devices offer some convenience and basic angle adjustment, they still have significant shortcomings: First, they have poor stability and are prone to slipping or deforming under greater stretching force, failing to provide stable support and affecting stretching effectiveness and safety. Second, they are limited in function, usually only capable of stretching in a single plane, making it difficult to simulate the multi-dimensional complex stresses experienced by ligaments in sports practice. Finally, they lack a systematic force feedback and protection mechanism, forcing athletes to rely mainly on subjective pain sensations to judge the degree of stretching, which is unscientific and prone to injury. Large professional stretching equipment: Some gyms or rehabilitation centers are equipped with large stretching machines, such as lower limb stretching machines with pulley weight systems. Although these machines can provide relatively stable resistance, they are usually bulky, complex in structure, and expensive, making them unsuitable for individual athletes to carry on a daily basis or use in training fields, homes, or other settings. In addition, their operation is complicated and the adjustment procedures are cumbersome, making it difficult to quickly adapt to the different joint mobility and training goals of different athletes. Summary of the Invention

[0003] The main objective of this invention is to provide a ligament stretching trainer for athletes, which can effectively solve the problems of difficulty in accurately controlling the stretching force and angle in traditional passive stretching methods, reliance on human experience, easy overstretching or understretching, and safety risks and low training efficiency.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A ligament stretching trainer for athletes includes a base mechanism, which includes a base plate, self-locking casters disposed at the bottom of the base plate, and adjustable support legs to lift the casters off the ground. It also includes a leg stretching mechanism and a height positioning mechanism mounted on the base mechanism. The leg stretching mechanism has a horizontally movable adjustment mechanism, a secondary stretching mechanism, and the height positioning mechanism has an arm stretching mechanism with adjustable vertical position.

[0005] Preferably, the leg extension mechanism includes a lifting upright plate mounted on the top, a lifting slide, a lifting drive assembly, and a lifting plate driven by the drive assembly to perform lifting movements. The lifting plate slides within the lifting slide provided in the lifting upright plate. The horizontal adjustment mechanism is disposed on the lifting plate. The lifting drive assembly includes a servo motor and a lifting threaded rod driven to rotate by the servo motor. The lifting plate is threadedly connected to the lifting threaded rod. The leg extension mechanism also includes a limiting slide for guiding the movement of the lifting plate.

[0006] Preferably, the horizontal adjustment mechanism includes a horizontal adjustment plate, a horizontal adjustment groove, a horizontal lead screw, and a translation plate. The horizontal adjustment plate is connected to the lifting plate. The horizontal lead screw is rotatably installed in the horizontal adjustment groove. One end of the horizontal adjustment groove is connected to a knob. The translation plate is threadedly connected to the horizontal lead screw and can move horizontally. The secondary tensioning mechanism is disposed on the translation plate.

[0007] Preferably, the secondary stretching mechanism includes a second servo motor, a secondary lifting screw, a U-shaped plate, and a second limiting slide rod. The second servo motor is mounted on the translation plate and drives the secondary lifting screw to rotate. The U-shaped plate is threadedly connected to the secondary lifting screw and slidably connected to the second limiting slide rod. The U-shaped plate is provided with components for placing and fixing the ankle. The components for placing and fixing the ankle include an ankle placement plate and an ankle Velcro strap. A sponge pad is fixedly adhered to the top of the ankle placement plate.

[0008] Preferably, the support leg assembly includes a support leg screw, a support leg fixed to the bottom of the support leg screw, and a fixing nut. The base plate has a threaded hole that runs vertically through it. The support leg screw is threadedly connected to the threaded hole, and the fixing nut is threadedly connected to the support leg screw to lock its position.

[0009] Preferably, the height positioning mechanism includes an adjustable plate, which has an adjusting groove and multiple square holes along its vertical upper edge. The arm extension mechanism is slidably connected to the adjusting groove via a positioning mechanism that can be locked into different positioning holes.

[0010] Preferably, the positioning mechanism includes a sliding box, a locking compartment, a slide plate retractably disposed in the locking compartment, a square locking block on one side of the slide plate, and an adjusting pull plate for operating the retraction of the square locking block. The square locking block tends to extend outward under the action of a spring to lock into a square insertion hole.

[0011] Preferably, the arm stretching mechanism includes an arm stretching plate, a stretching drive assembly, a stretching control plate, and a moving groove. The stretching drive assembly is disposed on the arm stretching plate and drives the stretching control plate to move. The stretching control plate is connected to an adaptive mechanism for fixing the wrist. The stretching drive assembly includes a servo motor and a control screw driven by the servo motor. The stretching control plate is threadedly connected to the control screw, and the control screw rotates within the moving groove.

[0012] Preferably, the adaptive mechanism includes a connecting plate, a spring groove, a compression plate, and an elastic component. The connecting plate is connected to a tension control plate. The compression plate is movably connected to the connecting plate through the elastic component. A wrist Velcro strap is provided on the compression plate. The elastic component includes a spring slide rod disposed on the connecting plate and a compression spring sleeved on the spring slide rod. The compression plate is slidably connected to the spring slide rod and compresses the compression spring. The spring slide rod is connected in the spring groove.

[0013] Preferably, the leg extension mechanism and the height positioning mechanism are provided with height-adjustable handles on the front side. The handles are installed in the lifting adjustment groove through handle adjustment blocks. The inner side of the lifting adjustment groove is provided with several positioning through holes. The handle adjustment blocks are fixed in height by spring buckles engaging with the positioning through holes.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention provides a ligament stretching trainer for athletes. It achieves precise control of lifting and translation through a servo motor-driven screw mechanism, enabling multi-dimensional and precise adjustment of the angle, height, and position of leg and arm stretches. This effectively solves the problems of unstable control of stretching force and angle in traditional stretching methods and reliance on human experience, thus improving the scientific nature and repeatability of stretching training.

[0015] 2. This invention provides a ligament stretching trainer for athletes. By setting up a horizontal adjustment mechanism and a secondary stretching mechanism, it can achieve horizontal displacement and secondary fine adjustment on the basis of a single lifting adjustment, thereby simulating the multi-dimensional composite stress on ligaments in sports practice, realizing multi-angle and composite stretching for specific ligaments, and enhancing the targeting and effectiveness of training.

[0016] 3. This invention provides a ligament stretching trainer for athletes, which adopts a base mechanism equipped with self-locking universal wheels and adjustable support legs, which is convenient for movement and positioning, and can provide stable support during training. It has a compact structure and integrated functions, overcoming the disadvantages of large stretching equipment that is bulky and inconvenient to carry. It is suitable for various usage scenarios such as training grounds and homes.

[0017] 4. This invention provides a ligament stretching trainer for athletes. The arm stretching mechanism is equipped with an adaptive mechanism with elastic cushioning, which can provide a gentle force transition and adaptive adjustment during the stretching process, avoiding injury caused by sudden tension. At the same time, the design of Velcro straps and sponge pads improves the safety and comfort of training. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the base mechanism of the present invention; Figure 3 This is a schematic diagram of the leg stretching mechanism of the present invention; Figure 4 This is a schematic diagram of the horizontal adjustment mechanism of the present invention; Figure 5 This is a schematic diagram of the secondary stretching mechanism of the present invention; Figure 6 This is a schematic diagram of the height positioning mechanism of the present invention; Figure 7 This is a schematic diagram of the positioning mechanism and the arm extension mechanism of the present invention; Figure 8 This is a schematic diagram of the adaptive mechanism structure of the present invention; Figure 9 This is a schematic diagram showing the disassembled state of the hand handle of the present invention.

[0019] In the diagram: 1. Base mechanism; 11. Base plate; 12. Threaded hole; 13. Support screw; 14. Support leg; 15. Fixing nut; 16. Self-locking caster wheel; 2. Leg extension mechanism; 21. Lifting upright plate; 211. Lifting adjustment groove; 212. Positioning through hole; 213. Handle adjustment block; 214. Hand handle; 215. Spring buckle; 22. Lifting slide groove; 23. Servo motor one; 24. Lifting threaded rod; 25. Lifting plate; 26. Limiting slide rod one; 3. Horizontal adjustment mechanism; 31. Horizontal adjustment plate; 32. Horizontal adjustment groove; 33. Horizontal lead screw; 34. Knob; 35. Translation plate; 4. Secondary extension mechanism; 41. Servo motor two; 42. Secondary lifting lead screw; 43. U-shaped 44. Ankle Placement Board; 45. Sponge Pad; 46. Ankle Velcro Strap; 47. Limiting Slide Rod II; 5. Height Positioning Mechanism; 51. Adjustable Vertical Plate; 52. Adjustable Slide Groove; 53. Square Insert Hole; 54. Positioning Mechanism; 541. Sliding Box; 542. Locking Block; 543. Spring; 544. Slide Plate; 545. Square Locking Block; 546. Adjustable Pull Plate; 6. Arm Extension Mechanism; 61. Arm Extension Plate; 62. Moving Slot; 63. Servo Motor III; 64. Control Screw; 65. Extension Control Plate; 66. Adaptive Mechanism; 661. Connecting Plate; 662. Spring Groove; 663. Spring Slide Rod; 664. Compression Spring; 665. Compression Plate; 666. Wrist Velcro Strap. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0021] like Figure 1 As shown, a ligament stretching trainer for athletes includes a base mechanism 1, a leg stretching mechanism 2 mounted on the base mechanism 1, and a height positioning mechanism 5. The leg stretching mechanism 2 is equipped with a horizontally movable adjustment mechanism 3, and the horizontal adjustment mechanism 3 is equipped with a secondary stretching mechanism 4. The height positioning mechanism 5 is equipped with an arm stretching mechanism 6 whose position can be adjusted vertically. This trainer, through the coordinated operation of multiple mechanisms, achieves stable, precise, and adjustable stretching of the ligaments in the athlete's legs and arms, and is suitable for athletes of different heights and training needs.

[0022] like Figure 1 and Figure 2As shown, the base mechanism 1 includes a base plate 11, with self-locking casters 16 installed at the four corners of the bottom of the base plate 11 to facilitate the movement and positioning of the entire device. The base plate 11 also has a support leg assembly for stable support of the device during training. The support leg assembly includes a support leg screw 13, a support leg 14 fixed to the bottom of the support leg screw 13, and a fixing nut 15. The base plate 11 has a through-hole 12 at a corresponding position, and the support leg screw 13 is threaded into the threaded hole 12. By rotating the support leg screw 13, the support leg 14 can contact the ground and push the self-locking casters 16 off the ground. Then, tightening the fixing nut 15 against the upper surface of the base plate 11 locks the support leg screw 13 in place, ensuring the stability of the device during training.

[0023] like Figure 1 and Figure 3 As shown, the leg extension mechanism 2 includes a lifting plate 21 fixedly installed on the top of the base plate 11. A lifting groove 22 is vertically formed along the upper edge of the lifting plate 21, and a lifting threaded rod 24 is rotatably installed within the lifting groove 22. The lifting threaded rod 24 is driven to rotate by a servo motor 23 installed on the top of the lifting plate 21. A lifting plate 25 is threadedly connected to the lifting threaded rod 24 through its internal threaded hole, and simultaneously, both sides of the lifting plate 25 are slidably connected to limiting slide rods 26 fixed within the lifting groove 22. When the servo motor 23 drives the lifting threaded rod 24 to rotate, the lifting plate 25 smoothly rises and falls along the lifting groove 22 under the guidance of the limiting slide rods 26.

[0024] like Figure 3 and Figure 4 As shown, the horizontal adjustment mechanism 3 is located on the side of the lifting plate 25. It includes a horizontal adjustment plate 31 fixedly connected to the lifting plate 25, with a horizontal adjustment groove 32 formed on the horizontal adjustment plate 31. A horizontal lead screw 33 is rotatably mounted within the horizontal adjustment groove 32, with one end of the lead screw 33 extending out of the horizontal adjustment plate 31 and fixed with a knob 34. A translation plate 35 is threadedly connected to the lead screw 33, and its two sides slide against the inner wall of the horizontal adjustment groove 32. By manually rotating the knob 34, the lead screw 33 is rotated, which drives the translation plate 35 to move horizontally along the horizontal adjustment groove 32, thereby adjusting the horizontal position of the secondary tensioning mechanism 4 mounted thereon.

[0025] like Figure 4 and Figure 5As shown, the secondary stretching mechanism 4 is fixedly mounted on the translation plate 35. It includes a servo motor 41, a secondary lifting screw 42 driven by the servo motor 41, a U-shaped plate 43, and two parallel limiting slide rods 47. The horizontal center of the U-shaped plate 43 is threadedly connected to the secondary lifting screw 42, while its two ends are slidably connected to the limiting slide rods 47. An ankle support plate 44 is fixed between the two vertical arms of the U-shaped plate 43, and a sponge pad 45 is adhered to the top surface of the ankle support plate 44 to improve comfort. An ankle Velcro strap 46 is also provided on the ankle support plate 44 to stably fix the athlete's ankle. When the servo motor 41 drives the secondary lifting screw 42 to rotate, it can cause the U-shaped plate 43 and the fixed ankle to perform secondary fine-tuning along the limiting slide rods 47, achieving micro-adjustment of the leg stretching intensity.

[0026] like Figure 1 , Figure 6 and Figure 7 As shown, the height positioning mechanism 5 includes an adjusting plate 51 fixedly mounted on the base plate 11. An adjusting groove 52 is vertically formed on the side of the adjusting plate 51, and multiple square insertion holes 53 are equally spaced on the inner walls of both sides of the adjusting groove 52. The arm extension mechanism 6 is slidably connected to the adjusting groove 52 via a positioning mechanism 54. The positioning mechanism 54 includes a sliding box 541 that can slide along the adjusting groove 52. A locking compartment 542 is provided inside the sliding box 541, and a sliding plate 544 is elastically arranged inside the locking compartment 542 via a spring 543. A square locking block 545 is fixed to the outside of the sliding plate 544, and an adjusting pull plate 546 extending out of the sliding box 541 is connected to the top of the sliding plate 544. Under the elastic force of the spring 543, the square locking block 545 tends to extend outward and engage with the square insertion holes 53, thereby locking the arm extension mechanism 6 at a certain height. When the height needs to be adjusted, simultaneously pinch the two adjusting pull plates 546 inward to drive the slide plate 544 to compress the spring 543, causing the square block 545 to retract and disengage from the square socket 53. The height of the arm extension mechanism 6 can then be adjusted by sliding it up and down. After releasing the adjusting pull plates 546, the square block 545 will automatically engage with the square socket 53 of the corresponding height under the action of the spring force to complete the positioning.

[0027] like Figure 7 As shown, the arm extension mechanism 6 includes an arm extension plate 61 fixedly connected to the positioning mechanism 54. A horizontally oriented moving groove 62 is formed on the arm extension plate 61, and a control screw 64 is rotatably mounted within the moving groove 62. The control screw 64 is driven by a servo motor 63 mounted at one end of the arm extension plate 61. An extension control plate 65 is threadedly connected to the control screw 64 and can move horizontally along the moving groove 62. An adaptive mechanism 66 is connected to the front end of the extension control plate 65.

[0028] like Figure 7 and Figure 8As shown, the adaptive mechanism 66 includes a connecting plate 661 fixedly connected to the stretch control plate 65. A spring groove 662 is provided on the connecting plate 661, and a spring slide rod 663 is fixed within the spring groove 662. A compression spring 664 is sleeved on the spring slide rod 663. The compression plate 665 is slidably connected to the spring slide rod 663 through a sliding hole thereon, compressing the compression spring 664. A wrist Velcro strap 666 is provided on the front of the compression plate 665 for securing the athlete's wrist. When the arm is stretched backward, the wrist acts on the compression plate 665, causing it to slide relative to the connecting plate 661 and compress the compression spring 664. This elastic structure provides cushioning and allows for a certain range of force adaptation, improving training safety and comfort.

[0029] like Figure 3 and Figure 9 As shown, height-adjustable handrails 214 are also provided on the front side of the lifting plate 21 of the leg stretching mechanism 2 and the adjusting plate 51 of the height positioning mechanism 5. The handrails 214 are installed in the lifting adjustment groove 211 located on the front side of the plate via handle adjustment blocks 213. Multiple positioning through holes 212 are provided on the inner wall of the lifting adjustment groove 211. A spring buckle 215 that can be elastically extended and retracted is provided on the handle adjustment block 213. The height of the handrails 214 can be adjusted by sliding the handle adjustment block 213 up and down. When the spring buckle 215 is aligned with and engages with the corresponding height positioning through hole 212, it is fixed, providing a stable support point for the athlete during stretching.

[0030] The working principle of the ligament stretching training device used by this athlete will be explained in detail below.

[0031] like Figure 1-9As shown, during use, firstly, the equipment is moved to the training position using the self-locking casters 16 of the base mechanism 1. Then, the support screws 13 are adjusted so that the support feet 14 touch the ground and lift the base plate 11, causing the casters to lift off the ground. Finally, the fixing nuts 15 are tightened to ensure the equipment is stable. When performing leg stretches, the athlete sits or stands next to the equipment, places their ankle on the ankle placement plate 44 of the secondary stretching mechanism 4, and secures it with the ankle Velcro strap 46. By controlling the servo motor 1 23 to drive the lifting plate 25 to rise and fall as a whole, a large-scale one-time stretch adjustment of the leg ligaments can be performed. By rotating the knob 34 to adjust the level adjustment mechanism 3, the horizontal position of the foot support point can be changed to adapt to different body postures. By controlling the servo motor 2 41 to drive the secondary lifting screw 42, a secondary fine-tuning of the ankle position can be achieved, allowing for precise micro-adjustment of the stretching intensity. The athlete can hold onto the handrail 214 to maintain body stability. When performing arm stretches, the arm stretching mechanism 6 is adjusted to a suitable height according to the athlete's height using the positioning mechanism 54. The athlete secures their wrist with the wrist Velcro strap 666 on the adaptive mechanism 66. The servo motor 63 is activated, driving the control screw 64 to rotate, which in turn moves the stretching control plate 65 and the adaptive mechanism 66 horizontally backward, thus providing a stable horizontal backward stretch to the athlete's raised arm. The compression spring 664 in the adaptive mechanism 66 provides elastic cushioning, achieving a smooth transition and adaptive adjustment of the stretching force. Through the coordinated operation of these mechanisms, this trainer provides athletes with stable, multi-dimensional, and precisely controllable ligament stretching training, effectively solving the problems of difficult force control, limited angle, and insufficient safety in traditional stretching methods.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A ligament stretching trainer for athletes, comprising a base mechanism (1), the base mechanism (1) comprising a base plate (11), self-locking casters (16) disposed at the bottom of the base plate (11), and adjustable support leg assemblies for lifting the self-locking casters (16) off the ground, characterized in that: It also includes a leg stretching mechanism (2) and a height positioning mechanism (5) provided on the base mechanism (1). The leg stretching mechanism (2) is provided with a horizontally movable horizontal adjustment mechanism (3). The horizontal adjustment mechanism (3) is provided with a secondary stretching mechanism (4). The height positioning mechanism (5) is provided with an arm stretching mechanism (6) whose position can be adjusted up and down.

2. The ligament stretching training device for athletes according to claim 1, characterized in that: The leg stretching mechanism (2) includes a lifting plate (21) mounted on top of (11), a lifting slide (22), a lifting drive assembly, and a lifting plate (25) driven by the drive assembly to perform lifting movements. The lifting plate (25) slides in the lifting slide (22) opened in the lifting plate (21). The horizontal adjustment mechanism (3) is set on the lifting plate (25). The lifting drive assembly includes a servo motor (23) and a lifting threaded rod (24) driven by the servo motor (23) to rotate. The lifting plate (25) is threadedly connected to the lifting threaded rod (24). The leg stretching mechanism (2) also includes a limiting slide rod (26) for guiding the movement of the lifting plate (25).

3. The ligament stretching training device for athletes according to claim 2, characterized in that: The horizontal adjustment mechanism (3) includes a horizontal adjustment plate (31), a horizontal adjustment groove (32), a horizontal lead screw (33), and a translation plate (35). The horizontal adjustment plate (31) is connected to the lifting plate (25). The horizontal lead screw (33) is rotatably installed in the horizontal adjustment groove (32). A knob (34) is connected to one end of the horizontal adjustment groove (32). The translation plate (35) is threadedly connected to the horizontal lead screw (33) and can move horizontally. The secondary tensioning mechanism (4) is set on the translation plate (35).

4. The ligament stretching training device for athletes according to claim 3, characterized in that: The secondary stretching mechanism (4) includes a second servo motor (41), a secondary lifting screw (42), a U-shaped plate (43), and a second limiting slide bar (47). The second servo motor (41) is mounted on the translation plate (35) and drives the secondary lifting screw (42) to rotate. The U-shaped plate (43) is threadedly connected to the secondary lifting screw (42) and slidably connected to the second limiting slide bar (47). The U-shaped plate (43) is provided with components for placing and fixing the ankle. The components for placing and fixing the ankle include an ankle placement plate (44) and an ankle Velcro strap (46). A sponge pad (45) is fixedly adhered to the top of the ankle placement plate (44).

5. The ligament stretching training device for athletes according to claim 1, characterized in that: The support assembly includes a support screw (13), a support foot (14) fixed to the bottom of the support screw (13), and a fixing nut (15). The base plate (11) has a threaded hole (12) that runs through the top and bottom. The support screw (13) is threaded to the threaded hole (12), and the fixing nut (15) is threaded to the support screw (13) to lock its position.

6. The ligament stretching training device for athletes according to claim 1, characterized in that: The height positioning mechanism (5) includes an adjusting plate (51), the adjusting plate (51) is provided with an adjusting groove (52) and a plurality of square holes (53) along the vertical direction, and the arm extension mechanism (6) is slidably connected to the adjusting groove (52) through a positioning mechanism (54) that can be locked to different positioning holes.

7. A ligament stretching training device for athletes according to claim 6, characterized in that: The positioning mechanism (54) includes a sliding box (541), a locking compartment (542), a slide plate (544) retractably disposed in the locking compartment (542), a square locking block (545) on one side of the slide plate (544), and an adjusting pull plate (546) for operating the retraction of the square locking block (545). The square locking block (545) tends to extend outward under the action of a spring (543) to lock into the square socket (53).

8. The ligament stretching training device for athletes according to claim 1, characterized in that: The arm stretching mechanism (6) includes an arm stretching plate (61), a stretching drive assembly, a stretching control plate (65), and a moving groove (62). The stretching drive assembly is disposed on the arm stretching plate (61) and drives the stretching control plate (65) to move. The stretching control plate (65) is connected to an adaptive mechanism (66) for fixing the wrist. The stretching drive assembly includes a servo motor (63) and a control screw (64) driven to rotate by the servo motor (63). The stretching control plate (65) is threadedly connected to the control screw (64), and the control screw (64) rotates in the moving groove (62).

9. A ligament stretching training device for athletes according to claim 8, characterized in that: The adaptive mechanism (66) includes a connecting plate (661), a spring groove (662), a compression plate (665), and an elastic component. The connecting plate (661) is connected to the tension control plate (65). The compression plate (665) is movably connected to the connecting plate (661) through the elastic component. A wrist Velcro strap (666) is provided on the compression plate (665). The elastic component includes a spring slide rod (663) provided on the connecting plate (661) and a compression spring (664) sleeved on the spring slide rod (663). The compression plate (665) is slidably connected to the spring slide rod (663) and compresses the compression spring (664). The spring slide rod (663) is connected in the spring groove (662).

10. A ligament stretching training device for athletes according to claim 1, characterized in that: The leg stretching mechanism (2) and the height positioning mechanism (5) are provided with height-adjustable handles (214) on the front side. The handles (214) are installed in the lifting adjustment groove (211) through handle adjustment blocks (213). The inner side of the lifting adjustment groove (211) is provided with several positioning through holes (212). The handle adjustment blocks (213) achieve height fixation through the snap-fit ​​cooperation between the spring buckle (215) and the positioning through holes (212).

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