CN118512314A - A knee joint rehabilitation training device - Google Patents

Abstract

The invention relates to the technical field related to knee joint rehabilitation training, in particular to a knee joint rehabilitation training device which comprises a base plate, wherein first placement grooves are symmetrically formed in two ends of one side of the top surface of the base plate, and foot support plates in sliding connection with the first placement grooves are arranged on one side of the first placement grooves; two first transmission cavities corresponding to the two first mounting grooves are symmetrically formed in the base plate, mounting plates which are arranged in the first mounting grooves and are in sliding connection with the first mounting grooves are arranged between the foot support plates and the first transmission cavities, and clamping plates are symmetrically arranged at two ends of the top surface of each mounting plate; the first driving component is adopted to drive the placement plate to move so as to enable the injured leg of the patient to bend the knee, and the second driving component which is linked with the first driving component can synchronously drive the foot support plate to move so as to enable the heel of the patient to be connected with the foot support plate after the leg is lifted, thereby carrying out auxiliary support on the leg lifting of the patient; synchronous can press the patient's sole near the toe part through the push plate.

Description

A knee joint rehabilitation training device

Technical Field

The present invention relates to the technical field related to knee joint rehabilitation training, and in particular to a knee joint rehabilitation trainer.

Background Art

The knee joint is composed of the lower end of the femur, the upper end of the tibia and the patella. It is the largest and most complex joint in the human body and belongs to the pulley joint. It helps the human body stand and realize the leg extension, flexion and extension, rotation and other movements. It is also a high-incidence site of joint diseases. Types of knee sprains include meniscus injury, ligament strain or rupture, patellar dislocation, tendonitis, fracture and other traumatic diseases. The common point of these injuries is that they cause joint pain and restricted activities. Long-term immobilization may cause complications such as muscle atrophy, joint adhesion, osteoporosis, etc., which seriously affect the individual's physical and mental health and life. Therefore, postoperative rehabilitation of knee injuries is very important. Early postoperative rehabilitation training can promote blood circulation and strengthen the meniscus after surgery. Nutrition to facilitate healing and promote muscle strength recovery, avoid complications such as muscle atrophy and joint stiffness; common rehabilitation training includes hip raising exercises and knee flexion exercises. When performing hip raising exercises, the patient needs to flex the knee joint of the injured leg 90 degrees to bear the load, straighten the other leg and maintain it for 6 seconds, and then slowly put it down to train the muscles around the knee joint and the hip muscles. However, in the early stages of rehabilitation training, the patient cannot spontaneously control the knee joint for orderly rehabilitation training, and then the staff needs to bend the patient's injured leg first, and then assist the patient on the other side to lift the leg and press the sole of the foot, which is time-consuming and labor-intensive, and lifting the patient's legs multiple times is labor-intensive for the staff.

Summary of the invention

The purpose of the present invention is to provide a knee joint rehabilitation training device in view of the defects and shortcomings of the prior art.

A knee joint rehabilitation trainer described in the present invention comprises a base plate, wherein first mounting grooves are symmetrically provided at both ends of one side of the top surface of the base plate, and a foot support plate slidably connected and matched with the first mounting groove is provided on one side of the first mounting groove; two first transmission cavities corresponding to the positions of the two first mounting grooves are symmetrically provided in the base plate, and a mounting plate mounted in the first mounting groove and slidably connected and matched with the first mounting groove is provided between the foot support plate and the first transmission cavity, and buckle plates are symmetrically provided at both ends of the top surface of the mounting plate, and straps for restraining the position of the patient's foot are fixed on the two buckle plates at the same end; a first driving component for driving the mounting plate to move and thereby assisting the patient's knee bending is provided in the first transmission cavity; a second transmission cavity provided in the base plate is provided in the middle between the two first transmission cavities, and a second driving component for synchronously driving the foot support plate to move when a single driving mounting plate moves is provided in the second transmission cavity, thereby assisting in maintaining the other raised leg of the patient and completing the training of the muscles around the injured knee joint.

Furthermore, a first baffle plate flush with the top surface of the base plate is provided on the side opposite to the foot support plate at both ends of the top surface of the first mounting groove, and the distance of the first baffle plate is equal to the length distance of the mounting plate. Second baffle plates connected to the end wall of the first mounting groove are symmetrically provided at both ends of the first baffle plate close to the foot support plate, and the second baffle plate is located above the mounting plate, and the length distance of the second baffle plate is equal to the length distance of the mounting plate.

The two legs are connected to the first and second guide grooves, and the ...

Furthermore, the first drive assembly includes a second transmission shaft symmetrically arranged in the two first transmission cavities and arranged along the width direction thereof, a first bevel gear concentric therewith is provided in the middle of the two second transmission shafts, a second bevel gear meshing therewith is provided on one side of the first bevel gear, a second screw shaft concentric therewith is provided on the second bevel gear, a third limiting ring is installed in the third sliding cavity extending from the first mounting groove to the mounting plate, and the third limiting ring is slidably connected and cooperated with the third sliding cavity; the second screw shaft is threadedly screwed with the mounting plate, and the second screw shaft is rotatably connected and cooperated with the base plate; a fourth gear and a fifth gear concentric therewith are provided on the two second transmission shafts, the first bevel gear is located between the fourth gear and the fifth gear at the same end, and the fourth gear and the fifth gear in the two first mounting grooves are positioned correspondingly.

Furthermore, the second drive assembly includes a first transmission shaft disposed in the second transmission cavity and arranged along its width direction, the first transmission shaft is slidably connected to and cooperated with the base plate, the first transmission shaft is provided with a worm shaft section concentric therewith, a worm wheel meshing therewith is provided below the worm shaft section, the worm wheel is provided with a first screw shaft concentric therewith, one end of the first screw shaft extends into the first slide groove, passes through the first drive plate and abuts against the side wall of the first slide groove; the first screw shaft is rotatably connected to and cooperated with the base plate, and the first screw shaft is threadedly screwed to and cooperated with the first drive plate.

Furthermore, one end of the first transmission shaft extends out of the first transmission cavity and the base plate is installed with a driving disk rotatably connected and cooperated therewith, and a connecting boss with a T-shaped cross-section is provided at the end face of the first transmission shaft, and the connecting boss is rotatably connected and cooperated with the driving disk; a handle is provided at the end face of the driving disk; the end of the first transmission shaft opposite to the driving disk extends to the second transmission cavity with a tooth surface set in the middle bearing shaft arranged at the inner end wall of the first mounting groove, and a second sliding gear concentric with it is installed, and the second sliding gear can slide axially along the tooth surface of the second transmission cavity; one end of the middle bearing shaft extends out of the base plate rotatably connected and cooperated with it, and is axially docked with the power output shaft of the motor arranged at the end wall of the base plate.

Furthermore, the shaft sections of the first transmission shaft respectively located in the two first mounting grooves are each provided with a first gear concentric therewith, and the first gear can mesh with the fourth gear; the shaft sections of the first transmission shaft located in the two first mounting grooves are respectively provided with a second gear and a third gear, and the second gear and the third gear can respectively mesh with two fifth gears, wherein the second gear and the third gear cannot mesh with the two fifth gears at the same time.

Furthermore, a center bearing shaft perpendicular to the end of the base plate corresponding to the driving disk is provided, and the center bearing shaft can be slidably connected and cooperated with the arc groove through which the driving disk is opened; the axial distance between the center bearing shaft and the end wall of the base plate at the same end is half of the maximum distance between the driving disk and the end wall of the base plate; the displacement length of the second sliding gear is equal to the maximum distance between the driving disk and the end wall of the base plate; the axial distance between the first gear and the second gear at the same end is the sum of the axial distance between the third gear and the first gear at the same end and the axial distance between the center bearing shaft and the end wall of the base plate at the same end.

Furthermore, when the first gear is meshed with the fourth gear, the worm shaft section is not meshed with the worm wheel; when the second gear is meshed with the fifth gear or the third gear is meshed with the fifth gear, the worm shaft section is meshed with the worm wheel.

After adopting the above structure, the beneficial effects of the present invention are as follows: it adopts the first driving component to drive the placement plate to move so that the patient's injured leg can perform knee flexion operation, and synchronously can drive the foot support plate to move through the second driving component linked thereto, so that the patient's heel can be connected with the foot support plate after the leg is raised, thereby providing auxiliary support for the patient's raised leg; synchronously, the patient's foot can be pressed inward near the toes through the pushing plate, so that the patient's leg is straightened to complete the hip raising exercise; synchronously, according to the different injured legs of the patient, the staff can pull the driving disk to enable the patient to complete single-leg bending or double-leg bending training; thereby avoiding the situation where the staff needs to manually assist the patient to complete the knee flexion and hip raising exercises, reducing the labor intensity of the staff, saving time and effort.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application, but do not constitute an improper limitation of the present invention. In the drawings:

Fig. 1 is a schematic diagram of the overall structure of the present invention;

FIG2 is a schematic diagram of the substrate structure of the present invention;

FIG3 is a schematic cross-sectional view of the structure of FIG2 in the present invention;

FIG4 is a schematic diagram of the structure of the second transmission cavity in the present invention;

FIG5 is a schematic diagram of the foot support plate structure of the present invention;

FIG6 is a schematic cross-sectional view of the structure of FIG5 in the present invention;

FIG7 is a schematic diagram of the structure of the first drive assembly and the second drive assembly in the present invention;

FIG8 is a schematic cross-sectional view of the first transmission shaft in the present invention;

FIG9 is a schematic diagram of the structure of the placement plate in the present invention;

10 is a schematic cross-sectional view of the placement plate of the present invention;

Description of reference numerals:

Base plate-1; first transmission cavity-2; second transmission cavity-3; first placement groove-4; first baffle-5; second baffle-6; first slide groove-7; middle bearing shaft-8; foot support plate-9; rib plate-10; first drive plate-11; placement platform-12; first sliding cavity-13; spring-14; first limit plate-15; connecting plate-16; push plate-17; first transmission shaft-18; connecting boss-19; first gear-20; second gear-21; third gear-2 2; worm shaft section-23; worm wheel-24; first screw shaft-25; second sliding gear-26; middle bearing shaft-27; second transmission cavity-28; motor-29; drive plate-30; handle-31; arc groove-32; second transmission shaft-33; fourth gear-34; first bevel gear-35; second bevel gear-36; second screw shaft-37; third limiting ring-38; fifth gear-39; placement plate-40; snap plate-41; third sliding cavity-42.

DETAILED DESCRIPTION

In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

As shown in Fig. 1 to Fig. 10, a knee joint rehabilitation trainer according to the present invention comprises a base plate 1, wherein first placement grooves 4 are symmetrically provided at both ends of one side of the top surface of the base plate 1, and a foot support plate 9 slidably connected and matched therewith is provided on one side of the first placement groove 4; two first transmission cavities 2 corresponding to the positions of the two first placement grooves 4 are symmetrically provided in the base plate 1, and a placement plate 40 placed in the first placement groove 4 and slidably connected therewith is provided between the foot support plate 9 and the first transmission cavity 2, and buckle plates 41 are symmetrically provided at both ends of the top surface of the placement plate 40, The two buckle plates 41 at the same end are fixed with straps for restraining the position of the patient's feet; the first transmission cavity 2 is provided with a first driving component for driving the placement plate 40 to move, thereby assisting the patient's knee bending; the second transmission cavity 3 is provided in the middle between the two first transmission cavities 2 and is opened in the base plate 1, and the second transmission cavity 3 is provided with a second driving component for synchronously driving the foot support plate 9 to move when a single driving placement plate 40 moves, thereby assisting in maintaining the patient's other raised leg, thereby completing the training of the muscles around the injured knee joint.

Furthermore, a first baffle plate 5 flush with the top surface of the base plate 1 is provided on the side opposite to the foot support plate 9 at both ends of the top surface of the first mounting groove 4, and the distance of the first baffle plate 5 is equal to the length distance of the mounting plate 40. Second baffle plates 6 connected to the end wall of the first mounting groove 4 are symmetrically provided at both ends of the first baffle plate 5 close to the foot support plate 9. The second baffle plate 6 is located above the mounting plate 40, and the length distance of the second baffle plate 6 is equal to the length distance of the mounting plate 40.

Furthermore, ribs 10 are symmetrically arranged at both ends of the side of the foot support plate 9 opposite to the first transmission cavity 2, and the bottom surface of the ribs 10 is slidably connected and matched with the first placement groove 4; the two foot support plates 9 are connected through a first driving plate 11, and the first driving plate 11 is slidably connected and matched with the first slide groove 7 opened between the two first placement grooves 4 on the base plate 1, and the side wall of the first slide groove 7 close to the second baffle plate 6 is flush with the side of the second baffle plate 6; a placement platform 12 is arranged on the top of the side of the foot support plate 9 opposite to the ribs 10, and the placement platform 12 is provided with a A first sliding cavity 13 is provided along its length direction, and a first limiting plate 15 is provided in the first sliding cavity 13 for sliding connection therewith. A connecting plate 16 is provided in the middle of the side of the first limiting plate 15 opposite to the foot support plate 9, and one end of the connecting plate 16 extends out of the placement table 12 and is installed with a pushing plate 17 for applying internal pressure to the sole of the patient's lifted foot and thereby tightening the lifted leg; a plurality of springs 14 are provided in the first sliding cavity 13, and the two ends of the spring 14 are respectively connected to the side wall of the first sliding cavity 13 and the side wall of the first limiting plate 15.

Further, the first drive assembly includes a second transmission shaft 33 symmetrically arranged in the two first transmission cavities 2 and arranged along the width direction thereof, a first bevel gear 35 concentric therewith is provided in the middle of the two second transmission shafts 33, a second bevel gear 36 meshing therewith is provided on one side of the first bevel gear 35, a second screw shaft 37 concentric therewith is provided on the second bevel gear 36, a third limit ring 38 is installed in the third sliding cavity 42 extending from the first mounting groove 4 to the mounting plate 40, and the third limit ring 38 is slidably connected and cooperated with the third sliding cavity 42; the second screw shaft 37 is threadedly screwed with the mounting plate 40, and the second screw shaft 37 is rotationally connected and cooperated with the base plate 1; a fourth gear 34 and a fifth gear 39 concentric therewith are provided on the two second transmission shafts 33, the first bevel gear 35 is located between the fourth gear 34 and the fifth gear 39 at the same end, and the fourth gear 34 and the fifth gear 39 in the two first mounting grooves 4 correspond in position.

Furthermore, the second drive assembly includes a first transmission shaft 18 disposed in the second transmission cavity 3 and arranged along its width direction. The first transmission shaft 18 is slidably connected to the base plate 1. A worm shaft section 23 concentric with the first transmission shaft 18 is provided. A worm wheel 24 meshing with the worm shaft section 23 is provided below the worm shaft section 23. A first screw shaft 25 concentric with the worm shaft section 23 is provided on the worm wheel 24. One end of the first screw shaft 25 extends into the first slide groove 7, passes through the first drive plate 11 and abuts against the side wall of the first slide groove 7; the first screw shaft 25 is rotatably connected to the base plate 1, and the first screw shaft 25 is threadedly screwed to the first drive plate 11.

Furthermore, one end of the first transmission shaft 18 extends out of the first transmission cavity 2 and the base plate 1 is installed with a driving disk 30 that is rotatably connected and cooperated with it. A connecting boss 19 with a T-shaped cross-section is provided at the end face of the first transmission shaft 18, and the connecting boss 19 is rotatably connected and cooperated with the driving disk 30; a handle 31 is provided at the end face of the driving disk 30; the end of the first transmission shaft 18 opposite to the driving disk 30 extends to the second transmission cavity 28 with a tooth surface set in the middle bearing shaft 27 set at the inner end wall of the first placement groove 4, and a second sliding gear 26 concentric with it is installed, and the second sliding gear 26 can slide axially along the tooth surface of the second transmission cavity 28; one end of the middle bearing shaft 27 extends out of the base plate 1 that is rotatably connected and cooperates with it, and is axially docked with the power output shaft of the motor 29 set at the end wall of the base plate 1.

Furthermore, the shaft sections of the first transmission shaft 18 respectively located in the two first mounting grooves 4 are each provided with a first gear 20 concentric therewith, and the first gear 20 can mesh with the fourth gear 34; the shaft sections of the first transmission shaft 18 located in the two first mounting grooves 4 are respectively provided with a second gear 21 and a third gear 22, and the second gear 21 and the third gear 22 can respectively mesh with two fifth gears 39, wherein the second gear 21 and the third gear 22 cannot mesh with the two fifth gears 39 at the same time.

Furthermore, a center bearing shaft 8 perpendicular to the end of the substrate 1 corresponding to the driving disk 30 is provided, and the center bearing shaft 8 can be slidably connected and cooperated with the arc groove 32 through-opened on the driving disk 30; the axial distance between the center bearing shaft 8 and the end wall of the same end of the substrate 1 is half of the maximum distance between the driving disk 30 and the end wall of the substrate 1; the displacement length of the second sliding gear 26 is equal to the maximum distance between the driving disk 30 and the end wall of the substrate 1; the axial distance between the first gear 20 and the second gear 21 at the same end is the sum of the axial distance between the third gear 22 and the first gear 20 at the same end and the axial distance between the center bearing shaft 8 and the end wall of the same end of the substrate 1.

Furthermore, when the first gear 20 meshes with the fourth gear 34 , the worm shaft section 23 does not mesh with the worm wheel 24 ; when the second gear 21 meshes with the fifth gear 39 or the third gear 22 meshes with the fifth gear 39 , the worm shaft section 23 meshes with the worm wheel 24 .

The following is a further description of the method and principle of the technical solution in this specific implementation method in conjunction with the accompanying drawings:

When it is necessary to perform hip-raising training on a patient with a damaged knee joint, the patient first lies flat on the top surface of the base plate 1. According to the position of the patient's injured leg, the staff can pull the first transmission shaft 18 through the handle 31 and the driving disc 30, thereby making the third gear 22 mesh with the fifth gear 39 or the second gear 21 mesh with the fifth gear 39; wherein the middle bearing shaft 8 can stop the driving disc 30 to complete the meshing of the second gear 21 and the fifth gear 39; when it is necessary to make the third gear 22 mesh with the fifth gear 39, the staff rotates the driving disc 30 so that the middle bearing shaft 8 is located in the arc groove 32, and then pushes the driving disc 30 again to complete the meshing of the third gear 22 and the fifth gear 39. The synchronized arc groove 32 allows the driving disc 30 to rotate a certain angle under the restriction of the middle bearing shaft 8, thereby facilitating the meshing of the third gear 22 and the fifth gear 39;

The staff will pre-bend the injured leg of the patient so that the sole of the foot is connected to the top surface of the placement plate 40, and fix it synchronously through the strap; at this time, the staff will start the motor 29, and the power output shaft of the motor 29 will rotate to drive the middle bearing shaft 27 axially connected to it to rotate, and the middle bearing shaft 27 will rotate through the second transmission cavity 28 with a tooth surface opened therein to synchronously drive the second sliding gear 26 to rotate, and the second sliding gear 26 will rotate to drive the first transmission shaft 18 concentric with it to rotate, and the first transmission shaft 18 will rotate to drive the second gear 21, the third gear 22 and the worm shaft section 23 concentric with it to rotate, and then according to the meshing condition selected by the staff, a second transmission shaft 33 will rotate, and the second transmission shaft 33 will rotate to drive the first bevel gear 35 concentric with it to rotate, and the first bevel gear 35 will rotate to drive the second bevel gear 36 meshed with it to rotate, and the second bevel gear 36 will rotate to drive the second screw shaft 37 concentric with it to rotate, and the second screw shaft 37 will rotate to drive the placement plate 40 threadedly connected with it to slide along the first placement groove 4, so that the patient's injured leg completes the knee flexion operation;

The synchronous rotation of the worm shaft section 23 drives the worm wheel 24 meshing therewith to rotate, and the rotation of the worm wheel 24 drives the first screw shaft 25 concentric therewith to rotate, and the rotation of the first screw shaft 25 drives the first drive plate 11 screwed therewith to move, thereby driving the two foot support plates 9 to move, wherein the knee bending and foot lifting are performed simultaneously, and then after the patient's other leg is lifted up, the patient's heel can be placed on the foot support plate 9 for auxiliary support, and the synchronous push plate 17 can press against the patient's sole near the toe and press the patient's sole inward under the action of its own position to complete the tightening of the leg, wherein the spring 14 can compensate for the force of the push plate 17 acting on the patient's sole to avoid excessive bending;

When the patient needs to perform knee flexion exercises, the staff pulls the handle 31 outward to the end, so that the two sets of first gears 20 are engaged with the fourth gear 34. At this time, the worm shaft section 23 moves to no longer engage with the worm wheel 24. At this time, the staff repeats the above operation to start the motor 29 to complete the bending operation of the patient's knees.

The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (9)

1. The utility model provides a knee joint rehabilitation training device which characterized in that: the novel shoe cover comprises a base plate (1), wherein first placement grooves (4) are symmetrically formed in two ends of one side of the top surface of the base plate (1), and foot support plates (9) in sliding connection with the first placement grooves (4) are arranged on one side of the first placement grooves; two first transmission cavities (2) corresponding to the positions of the two first mounting grooves (4) are symmetrically formed in the base plate (1), mounting plates (40) which are arranged in the first mounting grooves (4) and are in sliding connection with the first mounting grooves are arranged between the foot support plates (9) and the first transmission cavities (2), clamping plates (41) are symmetrically arranged at two ends of the top surface of each mounting plate (40), and binding belts for binding the foot positions of patients are fixed on the two clamping plates (41) at the same end; a first driving component for driving the placement plate (40) to move so as to assist the knee bending of the patient is arranged in the first transmission cavity (2); a second transmission cavity (3) arranged in the base plate (1) is arranged in the middle between the two first transmission cavities (2), and a second driving assembly used for driving the foot support plates (9) to move synchronously when the single driving placement plate (40) moves so as to assist in maintaining the other lifting leg of the patient and further completing the muscle training around the injured knee joint is arranged in the second transmission cavity (3).

2. The knee joint rehabilitation trainer according to claim 1, wherein: a first baffle (5) which is flush with the top surface of the base plate (1) is arranged on one side of the top surfaces of the two ends of the first placement groove (4) opposite to the foot support plates (9), the distance between the first baffle (5) and the length of the placement plate (40) is equal, the two ends of one side of the first baffle plate (5) close to the foot supporting plate (9) are symmetrically provided with second baffle plates (6) connected with the end walls of the first placement grooves (4), the second baffle plates (6) are located above the placement plates (40), and the length distance of the second baffle plates (6) is equal to that of the placement plates (40).

3. A knee joint rehabilitation trainer according to claim 2, wherein: rib plates (10) are symmetrically arranged at two ends of one side of the foot support plate (9) opposite to the first transmission cavity (2), and the bottom surfaces of the rib plates (10) are in sliding connection fit with the first mounting grooves (4); the two foot support plates (9) are connected through a first driving plate (11), the first driving plate (11) is in sliding connection fit with a first sliding groove (7) formed between two first mounting grooves (4) on the base plate (1), and the side wall of one side, close to the second baffle (6), of the first sliding groove (7) is flush with the side of the second baffle (6); the foot rest plate (9) is provided with a placement table (12) at the top of one side opposite to the rib plate (10), a first sliding cavity (13) arranged along the length direction of the placement table (12) is formed in the placement table, a first limiting plate (15) matched with the first sliding cavity (13) in a sliding connection mode is arranged in the first sliding cavity (13), a connecting plate (16) is arranged in the middle of one side, opposite to the foot rest plate (9), of the first limiting plate (15), one end of the connecting plate (16) extends out of the placement table (12) and is provided with a pushing plate (17) for pressing the sole of a patient to tighten the lifting leg; a plurality of springs (14) are arranged in the first sliding cavity (13), and two ends of each spring (14) are respectively connected with the side wall of the first sliding cavity (13) and the side wall of the first limiting plate (15).

4. A knee joint rehabilitation trainer according to claim 3, wherein: the first driving assembly comprises second transmission shafts (33) which are symmetrically arranged in the two first transmission cavities (2) and are arranged along the width direction of the first transmission shafts, first bevel gears (35) which are concentric with the second transmission shafts are arranged in the middle of the two second transmission shafts (33), a second bevel gear (36) which is meshed with the first bevel gear is arranged on one side of the first bevel gear (35), a second screw shaft (37) which is concentric with the second bevel gear is arranged on the second bevel gear (36), a third limit ring (38) is arranged in a third sliding cavity (42) which is arranged in the first mounting groove (4) and extends into the mounting plate (40), and the third limit ring (38) is in sliding connection with the third sliding cavity (42); the second screw shaft (37) is in threaded connection and matched with the placement plate (40), and the second screw shaft (37) is in rotary connection and matched with the base plate (1); the two second transmission shafts (33) are respectively provided with a fourth gear (34) and a fifth gear (39) which are concentric with the second transmission shafts, the first bevel gear (35) is positioned between the fourth gear (34) and the fifth gear (39) at the same end, and the positions of the fourth gear (34) and the fifth gear (39) in the two first mounting grooves (4) are corresponding.

5. The knee joint rehabilitation trainer according to claim 4, wherein: the second driving assembly comprises a first driving shaft (18) arranged in the second driving cavity (3) along the width direction of the first driving shaft, the first driving shaft (18) is in sliding connection fit with the base plate (1), a worm shaft section (23) concentric with the first driving shaft is arranged on the first driving shaft (18), a worm wheel (24) meshed with the worm shaft section (23) is arranged below the worm shaft section (23), a first screw shaft (25) concentric with the worm wheel is arranged on the worm wheel (24), and one end of the first screw shaft (25) extends into the first sliding groove (7) and passes through the first driving plate (11) to be abutted against the side wall of the first sliding groove (7); the first screw shaft (25) is in rotary connection fit with the base plate (1), and the first screw shaft (25) is in threaded connection fit with the first driving plate (11).

6. The knee joint rehabilitation trainer according to claim 5, wherein: one end of the first transmission shaft (18) extends out of the first transmission cavity (2) and the substrate (1) to be provided with a driving disc (30) in rotary connection with the first transmission cavity, a connecting boss (19) with a T-shaped section is arranged at the end face of the first transmission shaft (18), and the connecting boss (19) is in rotary connection with the driving disc (30); the end face of the driving disc (30) is provided with a handle (31); a second sliding gear (26) concentric with the first transmission shaft (18) is arranged in a second transmission cavity (28) which is arranged in a middle bearing shaft (27) arranged at the inner end wall of the first mounting groove (4) and is provided with a tooth surface, and the second sliding gear (26) can axially slide along the tooth surface of the second transmission cavity (28); one end of the middle bearing shaft (27) extends out to be in axial butt joint with a power output shaft of a motor (29) arranged at the end wall of the base plate (1) and matched with the base plate (1) in a rotating connection mode.

7. The knee joint rehabilitation trainer according to claim 6, wherein: the first transmission shafts (18) are respectively provided with first gears (20) concentric with the first transmission shafts on shaft sections positioned in the two first positioning grooves (4), and the first gears (20) can be meshed with fourth gears (34); the first transmission shaft (18) is arranged on the shaft sections in the two first mounting grooves (4) and can be respectively meshed with the second gear (21) and the third gear (22), the second gear (21) and the third gear (22) can be respectively meshed with the two fifth gears (39), and the second gear (21) and the third gear (22) can not be simultaneously meshed with the two fifth gears (39).

8. The knee joint rehabilitation trainer according to claim 7, wherein: one end of the base plate (1) corresponding to the driving disc (30) is provided with a middle bearing shaft (8) perpendicular to the base plate, and the middle bearing shaft (8) can be in sliding connection fit with an arc-shaped groove (32) formed in the driving disc (30) in a penetrating way; the axial distance between the middle bearing shaft (8) and the end wall at the same end of the base plate (1) is half of the maximum distance between the driving disc (30) and the end wall of the base plate (1); the displacement length of the second sliding gear (26) is equal to the maximum distance between the driving disc (30) and the end wall of the base plate (1); the axial distance between the first gear (20) and the second gear (21) at the same end is the sum of the axial distance between the third gear (22) and the first gear (20) at the same end and the axial distance between the middle bearing shaft (8) and the end wall at the same end of the base plate (1).

9. The knee joint rehabilitation trainer according to claim 8, wherein: when the first gear (20) is meshed with the fourth gear (34), the worm shaft section (23) is not meshed with the worm wheel (24); when the second gear (21) is meshed with the fifth gear (39) or the third gear (22) is meshed with the fifth gear (39), the worm shaft section (23) is meshed with the worm wheel (24).