Lower limb strength training device based on air pressure regulation and control

Abstract

The invention belongs to the related technical field of physical training, in particular to a lower limb strength training device based on air pressure regulation and control, and provides the following scheme that the lower limb strength training device comprises a shell, and a first roller is arranged on the lower side of the shell; the lower limb strength training device based on air pressure regulation and control is provided with a first gear plate and an annular rack plate, an annular frame can be driven to rotate by starting a driving motor, a first fixing column can rotate through rotation of the annular frame, and the first gear plate can automatically rotate through the annular rack plate through rotation of the first fixing column; a movable block can move through automatic rotation of a first gear plate, the movement of the movable block can drive a telescopic rod to reciprocate through a limiting groove, so that a pushing frame and a long rack plate can be driven to reciprocate, and the long rack plate can drive a supporting plate to reciprocate in the reciprocating movement process; and the supporting plate can automatically drive the lower limbs to move, so that people with less lower limb training can conveniently use the device.

Description

Technical Field

[0001] The present invention relates to the technical field related to sports training, and in particular to a lower limb strength training device based on air pressure regulation. Background Art

[0002] As people's health awareness improves, the demand for lower limb strength training continues to increase. Whether it is athletes who want to improve their athletic performance, patients with lower limb disabilities, or ordinary people who want to enhance their physical fitness and prevent diseases, they all need more scientific and effective training devices. The lower limb strength training device based on air pressure control just meets this market demand.

[0003] The lower limb strength trainer uses a mechanical structure design to achieve precise stimulation of the muscles in the thighs, calves, buttocks and other parts of the body, specifically including training of the quadriceps femoris (front thigh), hamstrings (back thigh), gluteus maximus / gluteus medius and calf muscles (gastrocnemius and soleus); it achieves muscle strengthening, functional repair and improvement of athletic performance within a safe and controllable range, and is an important tool for fitness, rehabilitation and daily health care.

[0004] Existing lower limb trainers have significant drawbacks in actual applications: on the one hand, most of the lower limb strength training devices on the market lack auxiliary components, which is extremely inconvenient to use for some users who do less lower limb training; on the other hand, the lower limb strength trainers have a complex process for strength adjustment, and operators are prone to hypoxia and dizziness during training, making it difficult for them to accurately adjust the trainer to the ideal training state by themselves.

[0005] For this purpose, a lower limb strength training device based on air pressure regulation is needed. Summary of the Invention

[0006] The lower limb strength training device based on air pressure control proposed in the present invention solves the problem that most of the lower limb strength training devices on the market in the prior art lack auxiliary components, which is extremely inconvenient to use for some users who do less lower limb training; the lower limb strength trainer has an inconvenient process in strength adjustment, the operator is prone to hypoxia and dizziness during training, and it is difficult to accurately adjust the trainer to the ideal training state by himself.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A lower limb strength training device based on air pressure control includes a housing, a first roller is provided on the lower side of the housing, a seat plate is fixed to the front wall of the housing, a backrest plate is fixed to the upper side of the housing, and a drive motor is fixed inside the housing;

[0009] The rotating end of the driving motor is provided with a first rotating shaft, the other end of the first rotating shaft is fixed with an annular frame, the lower wall of the annular frame is fixed with a first fixed column, the periphery of the first fixed column is provided with a first bearing, the periphery of the first bearing is provided with a first gear plate, the outer side of the first gear plate is meshed and connected with an annular rack plate, the lower wall of the first gear plate is fixed with a second fixed column, the periphery of the second fixed column is provided with a second bearing, the periphery of the second bearing is provided with a movable block, the other end of the movable block is provided with a telescopic rod, the connection between the movable block and the telescopic rod is provided with a second rotating shaft, the outer side of the telescopic rod is provided with a limiting slot, and the other end of the telescopic rod is fixed with a pushing frame.

[0010] Preferably, a long rack plate is provided on the inner side of the pushing frame, and a threaded bolt is provided at the connection between the pushing frame and the long rack plate, a slider is fixed above the long rack plate, and a slide rail is provided on the outer side of the slider, a first connecting plate is fixed on the top of the long rack plate, the other end of the first connecting plate is fixed on the first piston rod, the other end of the first piston rod is fixed on the first piston plate, a first air cavity tube is provided on the outer side of the first piston plate, one side of the long rack plate is meshed and connected to the second gear plate, a third bearing is provided on the inner side of the second gear plate, a third fixing column is provided on the inner side of the third bearing, a second connecting plate is fixed to the side wall of the second gear plate, a support plate is fixed on the other end of the second connecting plate, a support rod is fixed on the lower wall of the support plate, and a second roller is provided at the bottom end of the support rod.

[0011] Preferably, a first placement plate is provided on the upper surface of the support plate, a first hinge is provided at the connection between the support plate and the first placement plate, a second placement plate is provided on one side of the first placement plate, a second hinge is provided at the connection between the first placement plate and the second placement plate, a binding bandage is provided on the upper surface of the second placement plate, a foot pedal is provided on one side of the binding bandage, a fixing frame is provided on the lower side of the second placement plate, a third rotating shaft is provided at the connection between the second placement plate and the fixing frame, a second piston rod is provided on the side wall of the fixing frame, a second piston plate is provided at the other end of the second piston rod, and a second air cavity tube is provided on the outer side of the second piston plate.

[0012] Preferably, the annular frame and the first rotating shaft form a rotating structure through the operation of the driving motor, and the annular frame and the first fixed column form a fixed structure, and the first fixed column and the first gear plate form a rotating structure through the first bearing, and the first gear plate and the annular rack plate form an engaging structure.

[0013] Preferably, the first gear plate and the second fixed column form a fixed structure, and the second fixed column and the movable block form a rotating structure through the second bearing, and the movable block and the telescopic rod form a rotating structure through the second rotating shaft, and the telescopic rod and the pushing frame form a fixed structure.

[0014] Preferably, the pushing frame forms a detachable structure through threaded bolts and the long rack plate, and the long rack plate forms a sliding structure through sliders and slide rails.

[0015] Preferably, the elongated rack plate forms a fixed structure with the first piston rod through the first connecting plate, and the first piston rod forms a closed space with the first air cavity tube through the first piston plate.

[0016] Preferably, the elongated rack plate and the second gear plate form a meshing structure, and the second gear plate forms a rotating structure through a third bearing and a third fixing column, and the second gear plate forms a fixed structure through a second connecting plate and a support plate.

[0017] Preferably, the first placement plate forms a rotating structure with the support plate through a first hinge, and the second placement plate forms a rotating structure with the first placement plate through a second hinge, and the second placement plate forms a fixed structure with the foot pedal.

[0018] Preferably, the second placement plate forms a rotating structure with the fixing frame through the third rotating shaft, the fixing frame and the second piston rod form a fixed structure, and the second piston rod forms a closed space with the second air cavity tube through the second piston plate.

[0019] The present invention proposes a lower limb strength training device based on air pressure control. Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The lower limb strength training device based on air pressure control is provided with a first gear plate and an annular rack plate. By turning on the driving motor, the annular frame can be driven to rotate, and the rotation of the annular frame can rotate the first fixed column. The rotation of the first fixed column can make the first gear plate rotate automatically through the annular rack plate, and the automatic rotation of the first gear plate can make the movable block move. The movement of the movable block can drive the telescopic rod to move back and forth through the limit slot, thereby driving the pushing frame and the long rack plate to move back and forth. During the reciprocating movement of the long rack plate, the support plate can be driven to rotate back and forth, and the support plate can automatically drive the lower limbs to move, so that it can be used by people who do less lower limb training, thereby avoiding the lack of auxiliary components in most lower limb strength training devices, which is extremely inconvenient for some users who do less lower limb training.

[0021] 2. The lower limb strength training device based on air pressure control is provided with a push frame and a long rack plate. The push frame can be disassembled and assembled from the side wall of the long rack plate by setting a threaded bolt, so as to meet the needs of different groups of people. When normal people perform lower limb strength training, the push frame can be disassembled and exercised independently. When people who do not train their lower limbs much use it, the push frame can be assembled to assist in lower limb strength training, making the device more perfect.

[0022] 3. The lower limb strength training device based on air pressure control is provided with a long rack plate and a second gear plate. The user's lower limbs can be tied and fixed by binding a bandage first. When the user's lower limbs exert force outward, the support plate can be driven to rotate, and the rotation of the support plate can cause the second gear plate to rotate. Through the meshing structure of the long rack plate and the second gear plate, the rotation of the second gear plate can cause the long rack plate to move. The movement of the long rack plate can cause the first piston plate to move outward. The movement of the first piston plate can reduce the air pressure inside the first air cavity tube, so that the internal air pressure obtains suction, causing the first piston plate to move inward. The force changes according to the strength of the user's lower limbs, so as to perform strength training on the user.

[0023] 4. The lower limb strength training device based on air pressure control is provided with a first hinge and a second hinge. Through the setting of the first hinge and the second hinge, the user's lower limbs can be bent or straightened. Secondly, another set of air cavity tubes is also provided under the second placement plate. When the user's lower limbs are bent, the second piston plate will move toward the inner end of the second air cavity tube, increasing the air pressure inside it. The air pressure will push the second piston plate outward, creating a reverse force to facilitate the user's lower limb strength training. This component can perform strength training in another form. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a left-side structural schematic diagram of the lower limb strength training device based on air pressure control proposed by the present invention;

[0025] Figure 2 This is a right-side structural schematic diagram of the lower limb strength training device based on air pressure control proposed by the present invention;

[0026] Figure 3 This is a schematic structural diagram of a shell cross-section 1 of the lower limb strength training device based on air pressure control proposed by the present invention;

[0027] Figure 4 This is a schematic structural diagram of a shell cross-section 2 of the lower limb strength training device based on air pressure control proposed by the present invention;

[0028] Figure 5This is a schematic top view of the structure of the lower limb strength training device based on air pressure control proposed by the present invention;

[0029] Figure 6 This is a bottom-up structural diagram of the lower limb strength training device based on air pressure control proposed by the present invention;

[0030] Figure 7 This is a schematic cross-sectional structure diagram of the support plate of the lower limb strength training device based on air pressure control proposed by the present invention.

[0031] In the figure: 1, housing; 2, first roller; 3, seat plate; 4, backrest plate; 5, drive motor; 6, first rotating shaft; 7, annular frame; 8, first fixed column; 9, first bearing; 10, first gear plate; 11, annular rack plate; 12, second fixed column; 13, second bearing; 14, movable block; 15, second rotating shaft; 16, telescopic rod; 17, limit groove; 18, push frame; 19, threaded bolt; 20, long rack plate; 21, slider; 22, slide rail; 23, first connecting plate; 2 4. First piston rod; 25. First piston plate; 26. First air cavity tube; 27. Second gear plate; 28. Third bearing; 29. ​​Third fixing column; 30. Second connecting plate; 31. Support plate; 32. Support rod; 33. Second roller; 34. First hinge; 35. First placement plate; 36. Second hinge; 37. Second placement plate; 38. Binding bandage; 39. Foot pedal; 40. Third rotating shaft; 41. Fixing frame; 42. Second piston rod; 43. Second piston plate; 44. Second air cavity tube. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] See also Figure 1-7 The present invention provides a technical solution: a lower limb strength training device based on air pressure control, comprising a housing 1, a first roller 2 provided on the lower side of the housing 1, a seat plate 3 fixed to the front wall of the housing 1, a backrest plate 4 fixed above the housing 1, and a drive motor 5 fixed inside the housing 1;

[0034] A first rotating shaft 6 is provided at the rotating end of the driving motor 5, and an annular frame 7 is fixed to the other end of the first rotating shaft 6. A first fixed column 8 is fixed to the lower wall of the annular frame 7, and a first bearing 9 is provided on the periphery of the first fixed column 8. A first gear plate 10 is provided on the periphery of the first bearing 9, and an annular rack plate 11 is meshed and connected to the outer side of the first gear plate 10. A second fixed column 12 is fixed to the lower wall of the first gear plate 10, and a second bearing 13 is provided on the periphery of the second fixed column 12. A movable block 14 is provided on the periphery of the second bearing 13, and a telescopic rod 16 is provided at the other end of the movable block 14. A second rotating shaft 15 is provided at the connection between the movable block 14 and the telescopic rod 16, a limiting groove 17 is provided on the outer side of the telescopic rod 16, and a pushing frame 18 is fixed to the other end of the telescopic rod 16.

[0035] Furthermore, a long rack plate 20 is provided on the inner side of the pushing frame 18, and a threaded bolt 19 is provided at the connection between the pushing frame 18 and the long rack plate 20. A slider 21 is fixed above the long rack plate 20, and a slide rail 22 is provided on the outer side of the slider 21. A first connecting plate 23 is fixed to the top of the long rack plate 20, and a first piston rod 24 is fixed to the other end of the first connecting plate 23, and a first piston plate 25 is fixed to the other end of the first piston rod 24. A first air cavity tube 26 is provided on the outer side of the first piston plate 25, and a second gear plate 27 is meshed and connected to one side of the long rack plate 20, and a third bearing 28 is provided on the inner side of the second gear plate 27, and a third fixing column 29 is provided on the inner side of the third bearing 28. A second connecting plate 30 is fixed to the side wall of the second gear plate 27, and a support plate 31 is fixed to the other end of the second connecting plate 30. A support rod 32 is fixed to the lower wall of the support plate 31, and a second roller 33 is provided at the bottom end of the support rod 32.

[0036] Furthermore, a first placement plate 35 is provided on the upper surface of the support plate 31, a first hinge 34 is provided at the connection between the support plate 31 and the first placement plate 35, a second placement plate 37 is provided on one side of the first placement plate 35, a second hinge 36 is provided at the connection between the first placement plate 35 and the second placement plate 37, a binding bandage 38 is provided on the upper surface of the second placement plate 37, a foot pedal 39 is provided on one side of the binding bandage 38, a fixing frame 41 is provided on the lower side of the second placement plate 37, a third rotating shaft 40 is provided at the connection between the second placement plate 37 and the fixing frame 41, a second piston rod 42 is provided on the side wall of the fixing frame 41, a second piston plate 43 is provided at the other end of the second piston rod 42, and a second air cavity tube 44 is provided on the outer side of the second piston plate 43.

[0037] Furthermore, the annular frame 7 and the first rotating shaft 6 form a rotating structure through the operation of the driving motor 5, and the annular frame 7 and the first fixed column 8 form a fixed structure, and the first fixed column 8 forms a rotating structure with the first gear plate 10 through the first bearing 9, and the first gear plate 10 and the annular rack plate 11 form an engaging structure. By turning on the driving motor 5, the annular frame 7 can be driven to rotate, and the rotation of the annular frame 7 can rotate the first fixed column 8. The rotation of the first fixed column 8 can cause the first gear plate 10 to rotate by itself through the annular rack plate 11.

[0038] Furthermore, the first gear plate 10 and the second fixed column 12 form a fixed structure, and the second fixed column 12 forms a rotating structure with the movable block 14 through the second bearing 13, and the movable block 14 forms a rotating structure with the telescopic rod 16 through the second rotating shaft 15, and the telescopic rod 16 and the pushing frame 18 form a fixed structure. The self-rotation of the first gear plate 10 can make the movable block 14 move, and the movement of the movable block 14 can drive the telescopic rod 16 to move back and forth through the limit slot 17, thereby driving the pushing frame 18 and the long rack plate 20 to move back and forth. During the reciprocating movement of the long rack plate 20, it can drive the support plate 31 to rotate back and forth, and the support plate 31 can automatically drive the lower limbs to move.

[0039] Furthermore, the pushing frame 18 forms a detachable structure with the long rack plate 20 through the threaded bolt 19, and the long rack plate 20 forms a sliding structure with the slide block 21 and the slide rail 22. Through the setting of the threaded bolt 19, the pushing frame 18 can be disassembled and assembled from the side wall of the long rack plate 20 to cope with the use of different groups of people. When normal people perform lower limb strength training, the pushing frame 18 can be disassembled and exercised by themselves. When people with less lower limb training use it, the pushing frame 18 can be installed to assist in lower limb strength training.

[0040] Furthermore, the elongated rack plate 20 forms a fixed structure with the first connecting plate 23 and the first piston rod 24, and the first piston rod 24 forms a closed space with the first piston plate 25 and the first air cavity tube 26. The user's lower limbs can be first bound and fixed by the binding bandage 38. When the user's lower limbs exert force outward, the support plate 31 can be driven to rotate, and the rotation of the support plate 31 can cause the second gear plate 27 to rotate.

[0041] Furthermore, the elongated rack plate 20 and the second gear plate 27 form a meshing structure, and the second gear plate 27 forms a rotating structure through the third bearing 28 and the third fixed column 29, and the second gear plate 27 forms a fixed structure through the second connecting plate 30 and the support plate 31. Through the meshing structure of the elongated rack plate 20 and the second gear plate 27, the rotation of the second gear plate 27 can move the elongated rack plate 20, and the movement of the elongated rack plate 20 can move the first piston plate 25 outward. The movement of the first piston plate 25 can reduce the air pressure inside the first air cavity tube 26, so that the internal air pressure obtains suction, causing the first piston plate 25 to move inward. The force changes according to the strength of the user's lower limbs so as to perform strength training on them.

[0042] Furthermore, the first placement plate 35 forms a rotating structure with the support plate 31 through the first hinge 34, and the second placement plate 37 forms a rotating structure with the first placement plate 35 through the second hinge 36, and the second placement plate 37 and the foot pedal 39 form a fixed structure. Through the setting of the first hinge 34 and the second hinge 36, the user's lower limbs can be bent or straightened.

[0043] Furthermore, the second placement plate 37 forms a rotating structure with the fixing frame 41 through the third rotating shaft 40, and the fixing frame 41 and the second piston rod 42 form a fixed structure, and the second piston rod 42 forms a closed space with the second air cavity tube 44 through the second piston plate 43. Another set of air cavity tubes is also provided below the second placement plate 37. When the user's lower limbs are bent, the second piston plate 43 will move toward the inner end of the second air cavity tube 44 to increase the air pressure inside it. The air pressure will push the second piston plate 43 outward, and there is a reverse force to facilitate the user's lower limb strength training. This component can perform strength training in another form.

[0044] Working principle: First, the staff needs to disassemble and assemble the pushing frame 18 from the side wall of the long rack plate 20 through the threaded bolt 19, so as to cope with the use of different groups of people. When normal people are doing lower limb strength training, the pushing frame 18 can be disassembled and exercised by themselves. When people with less lower limb training use it, the pushing frame 18 can be installed to assist in lower limb strength training. The user's lower limbs can be tied and fixed by binding bandages 38. When the user's lower limbs exert force outward, the support plate 31 can be driven to rotate, and the rotation of the support plate 31 can make the second gear plate 27 rotate, and the rotation of the second gear plate 27 can make the long The rack plate 20 moves, and the movement of the long rack plate 20 can make the first piston plate 25 move outward. The movement of the first piston plate 25 can reduce the air pressure inside the first air cavity tube 26, so that the internal air pressure obtains suction, causing the first piston plate 25 to move inward. The force changes according to the strength of the user's lower limbs to perform strength training. Then, when the user's lower limbs are bent, the second piston plate 43 will move toward the inner end of the second air cavity tube 44, so that the internal air pressure increases, and the air pressure will push the second piston plate 43 outward, and there is a reverse force to facilitate the user's lower limb strength training. This component can perform strength training in another form.

[0045] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A lower limb strength training device based on air pressure regulation, comprising a housing (1), characterized in that: A first roller (2) is provided on the lower side of the shell (1), a seat plate (3) is fixed to the front wall of the shell (1), a backrest plate (4) is fixed above the shell (1), and a drive motor (5) is fixed inside the shell (1); The rotating end of the driving motor (5) is provided with a first rotating shaft (6), the other end of the first rotating shaft (6) is fixed with an annular frame (7), the lower wall of the annular frame (7) is fixed with a first fixed column (8), the periphery of the first fixed column (8) is provided with a first bearing (9), the periphery of the first bearing (9) is provided with a first gear plate (10), the outer side of the first gear plate (10) is meshedly connected with an annular rack plate (11), the lower wall of the first gear plate (10) is fixed with a second fixed column (12), the periphery of the second fixed column (12) is provided with a second bearing (13), the periphery of the second bearing (13) is provided with a movable block (14), the other end of the movable block (14) is provided with a telescopic rod (16), the connection between the movable block (14) and the telescopic rod (16) is provided with a second rotating shaft (15), the outer side of the telescopic rod (16) is provided with a limiting groove (17), and the other end of the telescopic rod (16) is fixed with a pushing frame (18).

2. The lower limb strength training device based on air pressure control according to claim 1, characterized in that: A long rack plate (20) is provided on the inner side of the pushing frame (18), a threaded bolt (19) is provided at the connection between the pushing frame (18) and the long rack plate (20), a slider (21) is fixed on the top of the long rack plate (20), a slide rail (22) is provided on the outer side of the slider (21), a first connecting plate (23) is fixed on the top of the long rack plate (20), a first piston rod (24) is fixed on the other end of the first connecting plate (23), a first piston plate (25) is fixed on the other end of the first piston rod (24), and the first piston plate (25) is fixed on the other end of the first piston rod (24). 5) is provided with a first air cavity tube (26) on the outside, the elongated rack plate (20) is meshedly connected to a second gear plate (27) on one side, a third bearing (28) is provided on the inner side of the second gear plate (27), a third fixing column (29) is provided on the inner side of the third bearing (28), a second connecting plate (30) is fixed to the side wall of the second gear plate (27), a support plate (31) is fixed to the other end of the second connecting plate (30), a support rod (32) is fixed to the lower wall of the support plate (31), and a second roller (33) is provided at the bottom end of the support rod (32).

3. The lower limb strength training device based on air pressure control according to claim 2, characterized in that: The upper surface of the support plate (31) is provided with a first placement plate (35), the connection between the support plate (31) and the first placement plate (35) is provided with a first hinge (34), one side of the first placement plate (35) is provided with a second placement plate (37), the connection between the first placement plate (35) and the second placement plate (37) is provided with a second hinge (36), the upper surface of the second placement plate (37) is provided with a binding bandage (38), one side of the binding bandage (38) is provided with a foot pedal (39), the lower side of the second placement plate (37) is provided with a fixing frame (41), the connection between the second placement plate (37) and the fixing frame (41) is provided with a third rotating shaft (40), the side wall of the fixing frame (41) is provided with a second piston rod (42), the other end of the second piston rod (42) is provided with a second piston plate (43), and the outer side of the second piston plate (43) is provided with a second air cavity tube (44).

4. The lower limb strength training device based on air pressure control according to claim 1, characterized in that: The annular frame (7) and the first rotating shaft (6) form a rotating structure through the operation of the driving motor (5), and the annular frame (7) and the first fixed column (8) form a fixed structure, and the first fixed column (8) forms a rotating structure with the first gear plate (10) through the first bearing (9), and the first gear plate (10) and the annular rack plate (11) form an engaging structure.

5. The lower limb strength training device based on air pressure control according to claim 1, characterized in that: The first gear plate (10) and the second fixed column (12) form a fixed structure, and the second fixed column (12) forms a rotating structure with the movable block (14) through the second bearing (13), and the movable block (14) forms a rotating structure with the telescopic rod (16) through the second rotating shaft (15), and the telescopic rod (16) and the pushing frame (18) form a fixed structure.

6. The lower limb strength training device based on air pressure control according to claim 1, characterized in that: The pushing frame (18) forms a detachable structure through a threaded bolt (19) and a long rack plate (20), and the long rack plate (20) forms a sliding structure through a slider (21) and a slide rail (22).

7. The lower limb strength training device based on air pressure control according to claim 2, characterized in that: The long rack plate (20) forms a fixed structure with the first connecting plate (23) and the first piston rod (24), and the first piston rod (24) forms a closed space with the first piston plate (25) and the first air cavity tube (26).

8. The lower limb strength training device based on air pressure control according to claim 2, characterized in that: The long rack plate (20) and the second gear plate (27) form a meshing structure, and the second gear plate (27) forms a rotating structure through a third bearing (28) and a third fixing column (29), and the second gear plate (27) forms a fixed structure through a second connecting plate (30) and a support plate (31).

9. The lower limb strength training device based on air pressure control according to claim 3, characterized in that: The first placement plate (35) forms a rotating structure with the support plate (31) through the first hinge (34), and the second placement plate (37) forms a rotating structure with the first placement plate (35) through the second hinge (36), and the second placement plate (37) and the foot pedal (39) form a fixed structure.

10. The lower limb strength training device based on air pressure control according to claim 3, characterized in that: The second placement plate (37) forms a rotating structure with the fixing frame (41) through the third rotating shaft (40), and the fixing frame (41) and the second piston rod (42) form a fixed structure, and the second piston rod (42) forms a closed space with the second piston plate (43) and the second air cavity tube (44).

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