Lower limb exercise device
By designing a lower limb exercise device including a bed plate, a back plate, a leg plate and a telescopic mechanism, the problem of weak patients spending a lot of physical strength during exercise and difficulty in doing the movements is solved, and an efficient and comfortable lower limb exercise effect is achieved.
Patent Information
- Application Number
- CN202411898153.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-02-14
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
When performing lower limb exercises, patients with weak bodies often lie down and sit up to do ankle exercises, which consumes physical strength and is difficult to do the movements properly, which affects the recovery effect.
A lower limb exercise device is designed, including a bed plate, back plate, leg plate and telescopic mechanism. Through the motor drive and gear system, the patient can convert from a lying position to a seat, and the foot is driven to the inner, outer and upper part through the telescopic mechanism. , activities in the lower direction.
This device saves the patient's physical energy consumption during position change, improves the effect and comfort of foot movement, increases the patient's enthusiasm for exercise, and ensures the accuracy and safety of movements.
Smart Images
Figure CN119424165A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of medical auxiliary equipment, in particular to a lower limb exercise device. Background Art
[0002] Vasculitis, also known as thromboangiitis obliterans, often occurs in the lower limbs. The early symptoms are cold extremities, numbness, swelling and pain, and gray or cyanotic color. If not treated in time, the condition will become more and more serious, and then the toes will turn purple and black, the pain will be severe, local ulceration and necrosis will occur, and it will not heal for a long time, causing great pain to the patient.
[0003] 4-5 minutes, then the patient lies flat on the bed and raises both lower limbs more than 45 degrees, and persists until the skin of the feet turns pale. This can drain the blood from the lower limbs, and persist for 1-2 minutes. Then the patient sits up, with both lower limbs hanging down under the bed, and at the same time, the feet move in all directions up, down, inward and outward. When moving, the amplitude should not be too large or too fast, until the skin of the affected limb turns red or purple. The sagging time is generally 4-5 minutes. Then the patient lies flat on the bed and rests for 5 minutes, repeats the above exercise, and repeats it 5 times, 3-4 times a day. The above-mentioned lower limb and ankle exercises are easy to complete for some strong patients, but for weak patients, they need to exercise 3 to 4 times a day. Frequent lying down and sitting up each time is more physically demanding, which reduces the patients' enthusiasm for lower limb exercises. There is also the possibility that the ankle exercises may not be performed properly, affecting the body's recovery effect. Summary of the invention
[0004] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the present invention is to provide a lower limb exercise device, which effectively solves the problem that weak patients frequently lie down and sit up to do ankle exercises, which is relatively physically demanding, and the problem that ankle movements cannot be performed properly, affecting physical recovery.
[0005] The technical solution is that the present invention comprises a bed board, a placement groove with an opening facing upward is provided on the left side of the bed board, and a through groove penetrating from top to bottom is provided on the right side of the bed board, a back board is rotatably connected to the right side of the placement groove via a first rotating shaft, and a leg board is rotatably connected to the left side of the through groove via a second rotating shaft, the back board and the leg board can rotate in the same direction, and the rotation angle of the leg board is greater than the rotation angle of the back board; The leg board is provided with a slidable slide board, on which two Y-shaped frames facing each other are fixed, and two cross shafts facing each other are provided above the slide board, and the front and rear ends of the two cross shafts are respectively connected to the corresponding Y-shaped frames for rotation, and the left and right ends of the cross shafts are connected to a rectangular frame for rotation, and the Y-shaped frame is located in the corresponding rectangular frame, and the two rectangular frames are respectively connected to telescopic mechanisms by ball hinges on the opposite sides and the right sides thereof, and the lower ends of the multiple telescopic mechanisms are respectively connected to the skateboard ball hinges, and the two telescopic mechanisms on the same rectangular frame perform alternating telescopic movements, and when the leg board is swung to a vertical state, the telescopic mechanism starts to move, and when the leg board is swung upward from a vertical state, the telescopic mechanism does not move; A pedal is fixed to the upper end of each of the two rectangular frames. A pedal groove is provided on the pedal. A fixing ring is fixed to one side of the pedal and a restraint belt is fixed to the other side of the pedal. The free end of the restraint belt can pass through the fixing ring and be bonded to itself via Velcro.
[0006] Compared with the prior art, the present invention has the following beneficial effects: The invention is novel in conception, ingenious in structure, easy to operate, and highly practical. A back plate and a leg plate, a transverse axis, a first threaded sleeve, a second threaded sleeve, a moving block, and a swinging gear are provided. After the patient's legs are raised 45 degrees, the motor is started to convert the patient from a supine position to a sitting position. After the patient maintains the sitting position, the reciprocating screw rotates, passing through a rack, a driving gear, a piston cylinder, a first air pipe, and a second air pipe, so that the telescopic mechanism alternately telescopes, so that the pedal and the restraint belt drive the patient's feet to move inward, outward, upward, and downward directions, thereby improving the foot activity effect. The first bevel gear, the second bevel gear, the third compression spring and the one-way bearing are arranged so that the reciprocating screw does not rotate when the leg board swings upward, that is, the pedal does not drive the patient's feet to move. Only after the patient switches to a sitting position can the telescopic mechanism drive the patient's feet to move. The whole process is simple to operate. The back board and the leg board support the patient's position change, which saves the physical strength of weak patients, increases comfort, and increases the patient's enthusiasm for daily exercise. BRIEF DESCRIPTION OF THE DRAWINGS
[0007] Figure 1 It is an axonometric view of the present invention.
[0008] Figure 2 It is a full cutaway front view of the present invention.
[0009] Figure 3 It is a partially cutaway front view of the present invention.
[0010] Figure 4 It is the cutaway left view of the present invention.
[0011] Figure 5 It is a cutaway top view of the leg plate and the slide plate in the present invention.
[0012] Figure 6 It is a cutaway top view of the present invention without the supporting legs.
[0013] Figure 7 It is a stepped cross-sectional view of the slide plate and the pedal in the present invention.
[0014] Figure 8 It is an axonometric drawing of the rectangular frame and the cross axis in the present invention.
[0015] Fig. 9 It is an axonometric drawing of the present invention without the bed board, the back board and the leg board.
[0016] Fig.10 It is a schematic diagram of the initial state of the present invention. DETAILED DESCRIPTION
[0017] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.
[0018] Depend on Figures 1 to 10 The invention provides a bed board 1, wherein the left side of the bed board 1 is provided with a placement groove with an opening facing upward and the right side thereof is provided with a through groove which passes through from top to bottom, the right side of the placement groove is connected with a back board 2 by rotation via a first rotating shaft, and the left side of the through groove is connected with a leg board 3 by rotation via a second rotating shaft, the back board 2 and the leg board 3 can rotate in the same direction, and the rotation angle of the leg board 3 is greater than the rotation angle of the back board 2; The leg board 3 is provided with a slidable slide plate 4, on which two Y-shaped frames 5 facing each other are fixed, and two cross shafts 6 facing each other are provided above the slide plate 4, and the front and rear ends of the two cross shafts 6 are respectively rotatably connected with the corresponding Y-shaped frames 5, and the left and right ends of the cross shaft 6 are rotatably connected with a rectangular frame 7, and the Y-shaped frame 5 is located in the corresponding rectangular frame 7, and the two rectangular frames 7 are respectively ball-hinged with telescopic mechanisms on the opposite sides and the right sides thereof, and the lower ends of the multiple telescopic mechanisms are respectively ball-hinged with the slide plate 4, and the two telescopic mechanisms on the same rectangular frame 7 perform alternating telescopic movements, and when the leg board 3 swings to a vertical state, the telescopic mechanism starts to move, and when the leg board 3 swings upward from a vertical state, the telescopic mechanism does not move; A pedal 8 is fixed to the upper end of each of the two rectangular frames 7, and a pedal groove is provided on the pedal 8. A fixing ring 9 is fixed to one side of the pedal 8, and a restraint belt 10 is fixed to the other side of the pedal 8. The free end of the restraint belt 10 can pass through the fixing ring 9 and be bonded to itself via Velcro.
[0019] In order to make the backboard 2 and the leg board 3 rotate in the same direction, a retaining ring 11 is fixed under the bed board 1, and a horizontal shaft 12 is rotatably connected to the retaining ring 11. A motor 13 is fixed to the left end of the horizontal shaft 12. A first threaded sleeve 14 and a second threaded sleeve 15 are fixed to the horizontal shaft 12. The first threaded sleeve 14 is located to the left of the second threaded sleeve 15. The length of the first threaded sleeve 14 is greater than the length of the second threaded sleeve 15. The pitch of the first threaded sleeve 14 is less than the pitch of the second threaded sleeve 15. The backboard 2 and the leg board 3 are respectively provided with gaps. The first rotating shaft and the second rotating shaft are respectively fixed with a swing gear 16 located in the notch, and two left and right opposite giving way grooves are provided on the lower side of the bed plate 1. The left side of the swing gear 16 on the right side is meshed with an intermediate gear, and the left side of the intermediate gear is meshed with a transition gear 17. The first threaded sleeve 14 and the second threaded sleeve 15 are respectively threadedly connected with a moving block 18, and the upper side of the moving block 18 is slidably connected with the giving way groove on the corresponding side, and the upper end of the moving block 18 is provided with a tooth groove that can mesh with the swing gear 16 or the transition gear 17 on the left side.
[0020] The telescopic mechanism comprises a telescopic cylinder 19 with a hollow interior, a telescopic rod 20 is slidably connected inside the telescopic cylinder 19, and the upper end of the telescopic rod 20 extends out of the telescopic cylinder 19 and is ball-hinged with the rectangular frame 7.
[0021] In order to make the two telescopic mechanisms on the same rectangular frame 7 perform alternating telescopic movements, two piston cylinders 21 opposite to each other up and down and opening to the left are fixed on the left side of the leg plate 3, a T-shaped piston 22 is slidably connected in the piston cylinder 21, and the two T-shaped pistons 22 move alternately. Two first air pipes 23 are connected to the right side of the upper piston cylinder 21, and the two first air pipes 23 are respectively connected to the lower sides of the two telescopic cylinders 19 opposite to each other front and back. Two second air pipes 24 are connected to the right side of the lower piston cylinder 21, and the two second air pipes 24 are respectively connected to the lower sides of the two telescopic cylinders 19 on the right side.
[0022] In order to make the two T-piston 22 rods move alternately, two supporting plates opposite to each other are fixed on the left side of the leg plate 3, a slide 25 is fixed between the two supporting plates, and two connecting plates are fixed on the right side of the slide 25. The two connecting plates are rotatably connected with driving gears 26. The two driving gears 26 rotate in opposite directions and are both unidirectional. The two driving gears 26 are hingedly connected with connecting rods 27 on the back sides, and the free ends of the connecting rods 27 are hingedly connected to the T-piston 22 on the corresponding side.
[0023] In order to make the two driving gears 26 rotate in opposite directions and unidirectionally, the two support plates are rotatably connected with an upper and lower axial reciprocating screw 29 via a one-way bearing 28, and a sliding rod 30 is threadedly connected to the reciprocating screw 29. The sliding rod 30 is slidably connected to the slideway 25. The sliding rod 30 is provided with two sliding grooves that are opposite to each other and open to the right. The bottom of the sliding groove is connected to a rack 32 that can mesh with the corresponding driving gear 26 via a first compression spring 31. Inverted L-shaped stoppers are respectively fixed on the opposite sides of the two connecting plates, and a ratchet 33 that cooperates with the driving gear 26 is hinged on the inner side of the stopper, and one side of the ratchet 33 is connected to the stopper via a spring.
[0024] In order to ensure that the telescopic mechanism starts to move after the leg plate 3 is swung to a vertical state, and the telescopic mechanism does not move when the leg plate 3 is swung upward from a vertical state, the left side walls of the two give way grooves are respectively fixed with second compression springs 34, and the right ends of the second compression springs 34 can contact the left end faces of the corresponding moving blocks 18. Key slots are respectively provided on the upper and lower sides of the horizontal axis 12, and flat keys 35 are slidably connected in the key slots. A first bevel gear 36 is fixed to the outer sides of the two flat keys 35, and the left side of the first bevel gear 36 is connected to the retaining ring 11 via a third compression spring 37, and a second bevel gear 38 that can mesh with the first bevel gear 36 is fixed to the upper end of the reciprocating screw 29.
[0025] In order to enable the skateboard 4 to slide on the leg board 3, T-slots are respectively provided on the front and rear sides of the leg board 3, and the skateboard 4 is slidably connected to the T-slots. The leg board 3 is provided with a plurality of positioning grooves 39 distributed along its length direction, and a T-shaped positioning rod 40 is slidably connected to the skateboard 4. The inner end of the positioning rod 40 is an inclined surface and can be inserted into the positioning groove 39, and the stepped surface at the outer end of the positioning rod 40 is connected to the skateboard 4 via a tension spring.
[0026] Support legs are fixed around the lower side of the bed board 1.
[0027] The motor 13 is a worm gear reduction motor.
[0028] In order to prevent the patient's skin from being damaged when the backboard and the leg board swing, protective plates 41 located in the gaps are fixed to the backboard and the bed board respectively.
[0029] When the present invention is in use, the backboard 2 is arranged in the placement groove, and the leg board 3 and the bed board 1 are at an angle of 45° (refer to the attached figure of the specification). Fig.10 ), the moving block 18 is located on the right side of the give way groove, and the two moving blocks 18 are respectively located on the right side of the first threaded sleeve 14 or the second threaded sleeve 15, that is, the tooth groove on the right side is about to mesh with the transition gear 17, and the tooth groove on the left side is not meshed with the swing gear 16 on the left side, and the first compression spring 31, the second compression spring 34, the third compression spring 37 and the spring are all in an initial state without being compressed; When the patient needs to do lower limb ankle exercises, he lies on the bed board 1 with his head facing left and his legs placed on the leg board 3. Family members or medical staff can assist the patient in adjusting the position of the pedal 8 and push the slide plate 4 toward the patient's waist. The inclined surface on the positioning rod 40 is squeezed by the side wall of the positioning groove 39, so that the positioning rod 40 moves outward and stretches the tension spring. When the inner end of the positioning rod 40 is completely out of the positioning groove 39, the slide plate 4 slides on the leg board 3 along the two T-slots. When the patient can be prevented from being on the corresponding pedal 8, the movement of the slide plate 4 is stopped. The inner end of the positioning rod 40 is inserted into the corresponding positioning groove 39 under the action of the tension spring. The position of the slide plate 4 is limited. The restraint belt 10 is passed around the patient's instep and passed through the fixing ring 9 and then bonded to the surface of the restraint belt 10 through the Velcro, so that the patient's foot is restrained on the pedal 8 to prevent the foot from slipping off the pedal 8. After the feet are placed at 45 degrees on the leg board 3 for 1 to 2 minutes, the feet turn white, and the motor 13 is started. The motor 13 drives the horizontal shaft 12 to rotate in the forward direction. Since the moving block 18 is slidably connected with the give way groove and is threadedly connected with the first threaded sleeve 14 or the second threaded sleeve 15, the moving block 18 on the right side moves to the left along the second threaded sleeve 15 and makes the tooth groove mesh with the transition gear 17. The transition gear 17 meshes with the swing gear 16 on the right side through the intermediate gear. The swing gear 16 drives the second rotating shaft and the leg board 3 to rotate clockwise. During this process, the moving block 18 on the left side moves to the left along the first threaded sleeve 14, but the tooth groove on the left side does not mesh with the swing gear 16 on the left side, so the backboard 2 remains in a horizontal state; When the motor 13 drives the horizontal shaft 12 to rotate so that the leg board 3 drives the patient's legs to rotate to a horizontal position, the moving block 18 on the left moves to the tooth groove thereon to be engaged with the swing gear 16 on the left. As the motor 13 continues to operate, the two moving blocks 18 continue to move to the left, and the tooth groove on the right engages with the transition gear 17, so that the swing gear 16 on the right continues to drive the leg board 3 to swing clockwise. At the same time, the tooth groove on the moving block 18 on the left engages with the swing gear 16 on the left, so that the swing gear 16 drives the first rotating shaft and the backboard 2 to rotate clockwise, gradually converting the patient from a supine position to a sitting position, and the moving block 18 gradually begins to squeeze the second compression spring 34. When the leg board 3 rotates to a vertical state, the tooth groove on the moving block 18 disengages from the transition gear 17 or the swing gear 16 on the left, and the moving block 18 disengages from the threaded connection with the first threaded sleeve 14 or the second threaded sleeve 15, and the patient is in a sitting position (refer to the attached figure of the specification). Figure 2 ), since the motor 13 continues to run in the forward direction, the tooth groove will not mesh with the swing gear 16 or the transition gear 17; At the same time, the second bevel gear 38 meshes with the first bevel gear 36, and the motor 13 drives the first bevel gear 36 to mesh with the second bevel gear 38 through the horizontal shaft 12 and the flat key 35, so that the reciprocating screw 29 rotates, and the one-way bearing 28 rotates. Since the slide bar 30 is slidably connected to the slideway 25 and is threadedly connected to the reciprocating screw 29, the slide bar 30 drives the two racks 32 to move upward, and the upper rack 32 meshes with the corresponding driving gear 26, and the upper driving gear 26 drives the connecting rod 27 to rotate clockwise. At the same time, the upper driving gear 26 squeezes The corresponding ratchet 33 is pressed, and the ratchet 33 swings downward around the hinge point and compresses the spring. The connecting rod 27 pushes the corresponding T-shaped piston 22 to move rightward, and the gas on the right side of the piston cylinder 21 is pushed into the two front and rear opposite telescopic cylinders 19 through the two first air pipes 23. The air pressure in the telescopic cylinder 19 increases, so that the telescopic rod 20 moves upward, and the front telescopic rod 20 pushes the front rectangular frame 7 to drive the pedal 8 to swing backward around the cross axis 6. The rear telescopic rod 20 pushes the rear rectangular frame 7 to drive the pedal 8 to swing forward around the cross axis 6, so that the patient's bilateral The feet swing inward at the same time. When the upper driving gear 26 rotates 90°, as the reciprocating screw 29 continues to operate, the upper rack 32 continues to move upward, and the upper driving gear 26 pushes the T-shaped piston 22 to move leftward through the connecting rod 27. The negative pressure on the right side of the piston cylinder 21 increases, and the gas in the two front and rear opposite telescopic cylinders 19 is sucked into the upper piston cylinder 21 through the two first air pipes 23. When the upper driving gear 26 rotates 180°, the two feet return to a horizontal state. When the upper driving gear 26 continues to rotate to 270°, the two feet return to a horizontal state. After the piston cylinder 21 has rotated 360°, the piston cylinder 21 sucks all the gas in the two corresponding telescopic cylinders 19 into the piston cylinder 21, so that the telescopic rod 20 pulls the rectangular frame 7 and the pedal 8 downward, and the pedal 8 and the rectangular frame 7 swing around the cross axis 6, driving the patient's feet to swing outward at the same time. When the upper driving gear 26 continues to rotate 360°, the piston cylinder 21 pushes part of the gas therein into the telescopic cylinder 19, so that the patient's feet return to a horizontal state. At this time, the upper rack 32 is disengaged from the driving gear 26, and the slide rod 30 moves to the upper end of the reciprocating screw 29. The first compression spring 31 is pressed against the toothed wheel 32 and the toothed wheel 33 is pressed against the toothed wheel 32 to release the toothed wheel 33. 26 drives the T-shaped piston 22 to move through the connecting rod 27, and the gas in the piston cylinder 21 on the lower side enters the two telescopic tubes 19 on the right side through the second air pipe 24, so that the telescopic rod 20 moves upward and pushes the right side of the rectangular frame 7 to swing leftward around the cross axis 6, that is, the patient's toes swing upward. Similarly, during the downward movement of the slide bar 30, the rack 32 on the lower side makes the driving gear 26 rotate one circle, and in this process, the telescopic movement of the telescopic mechanism makes the rectangular frame 7 drive the pedal 8 to repeatedly swing left and right around the cross axis 6, so as to realize the up and down swing of the patient's feet; as the motor 13 continues to operate, the reciprocating screw 29 rotates, so that the two pedals 8 drive the patient's feet to repeatedly swing inside and outside and up and down around the ankle; When the patient observes that the skin of the foot is flushed or purple, the motor 13 is operated to rotate in the opposite direction, and the motor 13 drives the horizontal shaft 12 and the first bevel gear 36 to rotate in the opposite direction. Due to the action of the one-way bearing 28, the reciprocating screw 29 cannot be reversed, so the first bevel gear 36 moves to the left under the pressure of the second bevel gear 38. After the third compression spring 37 is squeezed, the first bevel gear 36 is disengaged from the second bevel gear 38. At the same time, as the horizontal shaft 12 rotates in the opposite direction and the second compression spring 34 squeezes the moving block 18, the moving block 18 on the left is threadedly connected to the first threaded sleeve 14, and the moving block 18 on the right is threadedly connected to the second threaded sleeve 15, so that the tooth groove on the left is engaged with the swing gear 16 to drive the back plate 2 to swing counterclockwise, and the tooth groove on the right is engaged with the transition gear 17 , and the leg board 3 is swung upward through the intermediate gear and the swing gear 16. When the back board 2 is swung to the horizontal, the tooth groove on the left is disengaged from the swing gear 16. When the leg board 3 continues to swing to the horizontal state, the motor 13 is turned off, and the patient is in a supine state. After resting for 5 minutes, the motor 13 is restarted. The motor 13 continues to reverse the horizontal axis 12. After the leg board 3 swings upward to the initial position, the motor 13 is turned off, and the legs are raised at 45° for 1-2 minutes. The skin of the feet is pale, and the motor 13 is started again to make the motor 13 rotate forward. Repeat the above operations to convert the patient from a supine position to a sitting position, and drive the patient's feet to move inside, outside, up and down. The whole process is simple to operate, saves the patient's physical strength when frequently changing positions, and is beneficial to the patient's physical recovery.
[0030] In the present invention, the elastic force of the third compression spring 37 is greater than all mechanical resistances that need to be overcome when the first bevel gear 36 drives the second bevel gear 38 to rotate.
[0031] The forward and reverse control circuit of the motor 13 in the present invention adopts the existing technology and will not be described in detail here.
[0032] If it is desired to use the device more conveniently, a timer and a controller may be added to the present invention. The patient only needs to lie on the bed board 1 to realize automatic control of leg lifting, lying and sitting position conversion, as well as time setting for foot exercise and rest. The electronic device and connection relationship may adopt the existing technology.
Claims
1. A lower limb exercise device, comprising a bed board (1), characterized in that: The left side of the bed board (1) is provided with a placement groove opening upwards and the right side thereof is provided with a through groove penetrating from top to bottom; the right side of the placement groove is rotatably connected to a back board (2) via a first rotating shaft, and the left side of the through groove is rotatably connected to a leg board (3) via a second rotating shaft; the back board (2) and the leg board (3) can rotate in the same direction, and the rotation angle of the leg board (3) is greater than the rotation angle of the back board (2); The leg board (3) is provided with a slidable slide plate (4), two Y-shaped frames (5) are fixed on the slide plate (4) and are opposite to each other in front and back, and two cross shafts (6) are provided above the slide plate (4) and are opposite to each other in front and back, and the front and rear ends of the two cross shafts (6) are respectively rotatably connected to the corresponding Y-shaped frames (5), and the left and right ends of the cross shaft (6) are rotatably connected to a rectangular frame (7), and the Y-shaped frame (5) is located in the corresponding rectangular frame (7), and the two rectangular frames (7) are respectively ball-hinged with telescopic mechanisms on the opposite sides and the right sides thereof, and the lower ends of the multiple telescopic mechanisms are respectively ball-hinged with the slide plate (4), and the two telescopic mechanisms on the same rectangular frame (7) perform alternating telescopic movements, and when the leg board (3) swings to a vertical state, the telescopic mechanism starts to move, and when the leg board (3) swings upward from the vertical state, the telescopic mechanism does not move; A pedal (8) is fixed to the upper end of each of the two rectangular frames (7), and a pedal groove is provided on the pedal (8). A fixing ring (9) is fixed to one side of the pedal (8), and a restraining belt (10) is fixed to the other side of the pedal (8). The free end of the restraining belt (10) can pass through the fixing ring (9) and be bonded to the restraining belt via Velcro.
2. A lower limb exercise device according to claim 1, characterized in that: A retaining ring (11) is fixed below the bed board (1), a transverse shaft (12) is rotatably connected to the retaining ring (11), a motor (13) is fixed to the left end of the transverse shaft (12), a first threaded sleeve (14) and a second threaded sleeve (15) are fixed to the transverse shaft (12), the first threaded sleeve (14) is located to the left of the second threaded sleeve (15), the length of the first threaded sleeve (14) is greater than the length of the second threaded sleeve (15), the pitch of the first threaded sleeve (14) is less than the pitch of the second threaded sleeve (15), the back plate (2) and the leg plate (3) are respectively provided with notches, and the first threaded sleeve (14) and the second threaded sleeve (15) are provided with notches. A swing gear (16) located in the notch is fixed to the first rotating shaft and the second rotating shaft respectively. Two left and right opposite clearance grooves are provided on the lower side of the bed plate (1). An intermediate gear is meshed on the left side of the swing gear (16) on the right side, and a transition gear (17) is meshed on the left side of the intermediate gear. A moving block (18) is threadedly connected to the first threaded sleeve (14) and the second threaded sleeve (15) respectively. The upper side of the moving block (18) is slidably connected to the clearance groove on the corresponding side. A tooth groove is provided on the upper end of the moving block (18) and can mesh with the swing gear (16) or the transition gear (17) on the left side.
3. A lower limb exercise device according to claim 1, characterized in that: The telescopic mechanism comprises a telescopic cylinder (19) with a hollow interior, a telescopic rod (20) being slidably connected inside the telescopic cylinder (19), and an upper end of the telescopic rod (20) extending out of the telescopic cylinder (19) and being ball-hinged with the rectangular frame (7).
4. A lower limb exercise device according to claim 1, characterized in that: The left side of the leg plate (3) is fixed with two piston cylinders (21) which are opposed to each other up and down and open to the left. A T-shaped piston (22) is slidably connected in the piston cylinder (21). The two T-shaped pistons (22) move alternately. The right side of the upper piston cylinder (21) is connected with two first air pipes (23). The two first air pipes (23) are respectively connected to the lower sides of two telescopic cylinders (19) which are opposed to each other in the front and rear. The right side of the lower piston cylinder (21) is connected with two second air pipes (24). The two second air pipes (24) are respectively connected to the lower sides of the two telescopic cylinders (19) on the right side.
5. A lower limb exercise device according to claim 1, characterized in that: Two supporting plates facing each other up and down are fixed on the left side of the leg plate (3), a slideway (25) is fixed between the two supporting plates, and two connecting plates are fixed on the right side of the slideway (25). The two connecting plates are rotatably connected to driving gears (26), and the two driving gears (26) rotate in opposite directions and both rotate in one direction. The two driving gears (26) are respectively hingedly connected to connecting rods (27) on the opposite sides, and the free ends of the connecting rods (27) are hingedly connected to the T-shaped pistons (22) on the corresponding sides.
6. A lower limb exercise device according to claim 5, characterized in that: The two support plates are rotatably connected to a reciprocating screw (29) in an upper and lower axial direction via a one-way bearing (28), a slide rod (30) is threadedly connected to the reciprocating screw (29), the slide rod (30) is slidably connected to the slideway (25), the slide rod (30) is provided with two slide grooves which are opposite to each other and open to the right, the bottom of the slide groove is connected to a rack (32) which can mesh with the corresponding driving gear (26) via a first compression spring (31), and an inverted L-shaped stopper is fixed to the opposite sides of the two connecting plates, a ratchet (33) which cooperates with the driving gear (2626) is hingedly connected to the inner side of the stopper, and one side of the ratchet (33) is connected to the stopper via a spring.
7. A lower limb exercise device according to claim 2, characterized in that: A second compression spring (34) is fixed to the left side wall of the two give way grooves respectively, and the right end of the second compression spring (34) can contact the left end surface of the corresponding moving block (18). The upper and lower sides of the transverse shaft (12) are respectively provided with key grooves, and a flat key (35) is slidably connected in the key groove. A first bevel gear (36) is fixed to the outer side of the two flat keys (35). The left side of the first bevel gear (36) is connected to the retaining ring (11) via a third compression spring (37). A second bevel gear (38) that can mesh with the first bevel gear (36) is fixed to the upper end of the reciprocating screw (29).
8. The lower limb exercise device according to claim 1, characterized in that: The leg plate (3) is provided with T-shaped grooves on both the front and rear sides, respectively, and the slide plate (4) is slidably connected to the T-shaped grooves. The leg plate (3) is provided with a plurality of positioning grooves (39) distributed along its length direction, and a T-shaped positioning rod (40) is slidably connected to the slide plate (4). The inner end of the positioning rod (40) is an inclined surface and can be inserted into the positioning groove (39), and the outer end stepped surface of the positioning rod (40) is connected to the slide plate (4) via a tension spring.
9. The lower limb exercise device according to claim 1, characterized in that: Support legs are fixed on the four sides of the lower side of the bed board (1).
10. The lower limb exercise device according to claim 2, characterized in that: The motor (13) is a worm gear reduction motor.