Adjustable leg training machine

Abstract

The utility model provides an adjustable leg training machine which comprises a machine frame, a pedal plate, a bottom frame, a pedal plate frame and a seat, the pedal plate frame comprises a linkage arm and a fixing frame, the bottom end of the bottom frame is hinged to the machine frame, the top end of the bottom frame is hinged to the front end of the linkage arm, and the front end of the linkage arm is connected with a first barbell shaft. The rear end of the bottom frame is fixedly connected with the bottom end of the fixing frame and hinged to the rack, the front side of the top end of the fixing frame is connected with the pedal plate, a second barbell shaft is arranged on the rear side of the fixing frame, and the seat is arranged on the rack through a position adjusting mechanism and an angle adjusting mechanism and located on the front side of the bottom frame. According to the utility model, the seat with adjustable position and backrest angle can be adjusted according to the height, leg length and the like of a trainee, is flexible to use, is more in line with ergonomics, can meet the use requirements of different trainees, and improves the training effect and comfort. Meanwhile, the second barbell shaft is arranged for the trainee with small strength, and the trainee can relieve the self weight of the pedal part by increasing or decreasing the weight of barbell discs on the second barbell shaft.

Description

Technical Field

[0001] The utility model relates to the technical field of fitness equipment, in particular to an adjustable leg training machine. Background Art

[0002] The leg training machine is a common fitness equipment, which is widely used in fitness environments such as gyms. It mainly trains the leg muscles by simulating the pedaling movement of the lower body, strengthens and shapes the lower body muscle groups, and at the same time, leg training can effectively improve cardiovascular health and increase the explosive power and flexibility of the legs. At present, most leg training equipment is not flexible enough, and can only adjust the leg kicking distance according to the leg length of different trainees. Leg training is often in a sitting position. In addition to the leg kicking distance, the trainee's leaning angle also affects the comfort and effect of training; at the same time, the pedal structure of the leg training equipment usually has a large dead weight. When the trainee retracts his legs, he will be affected by the gravity of the pedal structure. For people with less strength, it is easy to be unable to support the weight of the pedal structure when retracting his legs, which will cause training difficulties or even injuries to the trainee. Existing leg training equipment is difficult to meet the needs of different trainees, so there is a need for a leg training machine with high flexibility and strong adaptability. Utility Model Content

[0003] In order to solve the problems existing in the background technology, the utility model proposes an adjustable leg training machine, including a frame, a footrest, a base frame, a footrest frame and a seat, the footrest frame including a linkage arm and a fixed frame, the bottom end of the base frame is hinged to the frame, the top end of the base frame is hinged to the front end of the linkage arm, the front end of the linkage arm is connected with a first barbell shaft, the rear end of the linkage arm is fixedly connected to the bottom end of the fixed frame, the rear end of the linkage arm is hinged to the frame, the front side of the top end of the fixed frame is connected to the footrest, and the rear side of the fixed frame is provided with a second barbell shaft, the seat is arranged on the frame through a position adjustment mechanism and an angle adjustment mechanism, and the seat is located on the front side of the base frame.

[0004] Preferably, the position adjustment mechanism includes a sliding plate and an adjustment plate, the adjustment plate is fixedly connected to the frame, a plurality of first adjustment holes are provided on the adjustment plate in the front-to-back direction, the sliding plate is slidably set on the frame, a first positioning pin matching the first adjustment hole is provided on the sliding plate, and the seat is set on the sliding plate.

[0005] Preferably, the sliding plate is provided with an adjustment handle, the first positioning latch comprises a first fixed shell, a first latch, a first return spring and a first limit rod, the first fixed shell is fixedly connected to the sliding plate, the first fixed shell is communicated with the sliding plate, the first latch is slidably arranged in the first fixed shell, the first latch is located at one end of the first fixed shell close to the sliding plate, the first limit rod is fixed in the first fixed shell, the first limit rod is located at one end of the first fixed shell away from the sliding plate, a sliding rod is provided at one end of the first fixed shell away from the sliding plate, the sliding rod has a diameter smaller than that of the first latch and the first limit rod, the sliding rod slides through the first limit rod and extends outside the first fixed shell, and the first return spring is arranged between the first limit rod and the first latch;

[0006] One end of the adjusting handle is hinged to the sliding plate, the other end of the adjusting handle extends to one side of the seat, and one end of the sliding rod located outside the first fixed shell is connected to the adjusting handle.

[0007] Preferably, the seat includes a seat plate and a backrest, the seat plate is fixedly connected to the sliding plate, the bottom end of the backrest is hinged to the sliding plate, the angle adjustment mechanism includes an adjusting rod and an adjusting tube, one end of the adjusting tube is hinged to the top end of the backrest, the other end of the adjusting tube is slidably sleeved on the outer wall of one end of the adjusting rod, the other end of the adjusting rod is hinged to the sliding plate, a plurality of second adjustment holes are provided on the adjusting rod along the length direction, and a second positioning pin matching the second adjustment hole is provided on the adjusting tube.

[0008] Preferably, a pin control mechanism for controlling the second positioning pin to insert / disengage from the second adjustment hole is provided on one side of the seat plate, and a first gas spring is provided on the back side of the backrest, one end of the first gas spring is hinged to the backrest, and the other end of the first gas spring is hinged to the sliding plate.

[0009] Preferably, the second positioning latch comprises a second fixed shell, a second latch, a second return spring and a second limit rod, the second fixed shell is fixedly connected to the adjustment tube, the second fixed shell is communicated with the adjustment tube, the second latch is slidably arranged in the second fixed shell, the second latch is located at one end of the second fixed shell close to the adjustment tube, the second limit rod is fixed in the second fixed shell, the second limit rod is located at one end of the second fixed shell away from the adjustment tube, a wiring hole is provided in the second limit rod, and the second return spring is arranged between the second limit rod and the second latch;

[0010] The latch control mechanism includes a brake line and a handle, wherein the handle is hinged on one side of the seat plate, one end of the brake line is connected to the handle, and the other end of the brake line passes through a wiring hole and a second return spring to be connected to the second latch.

[0011] Preferably, a second buffer block is fixed on the sliding plate, and the second buffer block is located on the rear side of the backrest.

[0012] Preferably, the base frame is a U-shaped frame, and there are two linking arms, which are respectively located on both sides of the seat, and the front ends of the two linking arms are respectively connected to the two vertical rods of the U-shaped frame.

[0013] Preferably, it also includes an adjustment arm and an adjustment rod, the bottom end of the adjustment arm is hinged to the front end of the linkage arm, the top end of the adjustment arm is fixed to the first barbell shaft, one end of the adjustment rod is hinged to the adjustment arm, and the other end of the adjustment rod is hinged to the frame.

[0014] Preferably, an adjustable safety mechanism is provided on the frame, and the adjustable safety mechanism is located below the linkage arm. The adjustable safety mechanism includes an adjusting handle, a fixed tube and a moving rod. The fixed tube is fixed on the frame, and the moving rod is slidably arranged in the fixed tube, and both ends of the moving rod extend outside the fixed tube. A plurality of third adjustment holes are provided on the moving rod along the length direction, and a third positioning pin matching the third adjustment hole is provided on the fixed tube. A first buffer block is provided on the top end of the moving rod, and the adjusting handle is fixed at the bottom end of the moving rod.

[0015] The utility model has the following beneficial effects:

[0016] 1. The utility model has a seat with adjustable position and backrest angle. The seat can be adjusted according to the height, leg length, etc. of the trainee. It is flexible to use and more ergonomic. It can meet the use needs of different trainees and improve the training effect and training comfort.

[0017] 2. The utility model can alleviate the self-weight problem of the pedal part by increasing or decreasing the weight of the barbell plates on the second barbell shaft. That is, when the trainee retracts his legs and the pedal structure returns to the state where it begins to fall under its own weight, the barbell plates on the second barbell shaft can exert a force on the pedal structure that is opposite to the gravity of the pedal structure, thereby avoiding the situation where the trainee cannot support the pedal plate when retracting his legs due to the excessive weight of the pedal structure, thereby improving the training effect and training safety. At the same time, the weight of the barbell plates on the second barbell shaft can be adjusted according to the strength of different training, thereby meeting the usage needs of different trainees.

[0018] 3. Since the trainee's legs are bent in the initial state of training, it is most strenuous to push up at this time. As the legs continue to straighten, the trainee will feel relaxed. Therefore, it is difficult to push up smoothly when the load is heavy, and the training effect cannot be achieved when the load is light. The utility model is provided with an adjustment arm and an adjustment pull rod, which can realize the change of the force arm during pedaling training. As the trainee's legs extend when pedaling, the adjustment pull rod drives the adjustment arm to swing backward, so that the force arm from the barbell plate on the first barbell axis to the hinge point becomes longer, and the force required for the trainee to push the foot pedal increases, thereby ensuring a good training effect while pushing up smoothly.

[0019] 4. The utility model is provided with an adjustable safety mechanism to prevent the linkage arm from falling due to mistakes during training, thereby improving the safety of training.

[0020] 5. The utility model is provided with a latch control mechanism, so that the trainee can adjust the backrest angle on the seat, which is convenient to adjust and can feel whether the backrest angle is appropriate in real time. At the same time, the first gas spring can support the backrest when adjusting the angle, avoiding the trainee from falling down instantly, thereby improving the reliability of adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 It is a schematic diagram of the side structure of the utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the utility model after the sliding plate is hidden;

[0024] Figure 4 This is the enlarged view of point A in 3;

[0025] Figure 5 This is a cross-sectional view of the first positioning latch structure of the utility model;

[0026] Figure 6 This is a cross-sectional view of the second positioning latch structure of the utility model.

[0027] Numbers in the figure: 1, frame; 2, linkage arm; 3, fixed frame; 4, bottom frame; 5, pedal board; 51, gripper; 6, second barbell shaft; 7, first barbell shaft; 8, adjustment arm; 9, adjustment rod; 10, seat; 101, seat plate; 102, backrest; 11, sliding plate; 12, first positioning pin; 121, first fixed shell; 122, first pin; 123, first limit rod; 124, sliding rod; 125, first return spring; 13, adjustment tube; 14, adjustment rod; 141, second adjustment hole; 15, second positioning pin; 151, second fixed shell; 152. Second limit rod; 153. Second return spring; 154. Second latch; 16. Brake line; 17. Adjustable safety mechanism; 171. Moving rod; 172. Adjusting handle; 173. First buffer block; 174. Fixed tube; 8. Sliding sleeve; 19. Sliding shaft; 20. First gas spring; 21. Adjusting handle; 22. Second buffer block; 23. Foot pedal; 24. Foot pedal frame cover; 25. Power lever; 26. Seat armrest; 27. Adjusting plate; 271. First adjusting hole; 28. Handle; 29. ​​Second gas spring; 30. Connecting rod; 31. Rear barbell axle frame. DETAILED DESCRIPTION

[0028] In order to make the present invention clearer and more understandable, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the given embodiment is only one implementation method and does not represent all embodiments.

[0029] In this article, the terms "upper, lower, front, and back" are established based on the positional relationships shown in the drawings. Depending on the different drawings, the corresponding positional relationships may also change accordingly. Therefore, they cannot be understood as absolute limitations on the scope of protection.

[0030] Combined with Figure 1-6 , an adjustable leg training machine, comprising a frame 1, a footrest 5, a base frame 4, a footrest frame and a seat 10, the footrest frame comprising a linkage arm 2 and a fixed frame 3, the bottom end of the base frame 4 is hinged to the frame 1, the top end of the base frame 4 is hinged to the front end of the linkage arm 2, the front end of the linkage arm 2 is connected with a first barbell shaft 7, the rear end of the linkage arm 2 is fixedly connected to the bottom end of the fixed frame 3, the rear end of the linkage arm 2 is hinged to the frame 1, the position of the rear end of the linkage arm 2 is higher than the position of the front end of the linkage arm 2, the front side of the top end of the fixed frame 3 is connected to the footrest 5, the rear side of the fixed frame 3 is provided with a second barbell shaft 6, the second barbell shaft 6 is connected to the fixed frame 3 through a rear barbell shaft frame 31, the seat 10 is arranged on the frame 1 through a position adjustment mechanism and an angle adjustment mechanism, and the seat 10 is located on the front side of the base frame 4. More specifically, the footrest 5 is connected to the fixing frame 3 through the footrest frame cover plate 24, the footrest 5 is fixed to the front end of the footrest frame cover plate 24, a power rod 25 is provided at the rear end of the footrest frame cover plate 24, the top end of the power rod 25 is hinged to the rear end of the footrest frame cover plate 24, the bottom end of the power rod 25 is hinged to the frame 1, and the fixing frame 3 is hinged at the middle and rear position of the footrest frame cover plate 24. A foot pedal 23 is fixed to the frame 1 in front of the seat 10, the first barbell shaft 7 and the second barbell shaft 6 are used to place barbell plates, and a gripper 51 is provided at the top end of the footrest 5.

[0031] Specifically, the position adjustment mechanism includes a sliding plate 11 and an adjustment plate 27, the adjustment plate 27 is fixedly connected to the frame 1, and a plurality of first adjustment holes 271 are provided on the adjustment plate 27 along the front-back direction, the sliding plate 11 is slidably arranged on the frame 1, and a first positioning pin 12 matching the first adjustment hole 271 is provided on the sliding plate 11, and the seat 10 is arranged on the sliding plate 11, and when the first positioning pin 12 is separated from the first adjustment hole 271, the sliding plate 11 can slide, and the first positioning pin 12 is made to correspond to different first adjustment holes 271 by moving the sliding plate 11, and the sliding plate 11 is fixed by inserting the first positioning pin 12 into the first adjustment hole 271, thereby realizing the adjustment of the position of the seat 10. More specifically, a second gas spring 29 is provided at the front side of the sliding plate 11, one end of the second gas spring 29 is connected to the sliding plate 11, and the other end of the second gas spring 29 is connected to the frame 1, and the second gas spring 29 can play a booster role to improve the reliability of position adjustment.

[0032] Specifically, a sliding shaft 19 is fixed on the frame 1, and there are two sliding shafts 19 distributed on both sides of the frame 1. A sliding sleeve 8 is slidably arranged on the sliding shaft 19, and a buffer pad is provided at the end of the sliding shaft 19. The buffer pad can prevent the sliding sleeve 8 from bumping, etc. The length of the sliding sleeve 8 is smaller than the length of the sliding shaft 19. The two ends of the sliding plate 11 are respectively fixedly connected to the two sliding sleeves 8. The sliding plate 11 can slide along the sliding shaft 19 through the sliding sleeve 8. The sliding plate 11 is located above the adjusting plate 27.

[0033] Specifically, the sliding plate 11 is provided with an adjusting handle 21, the first positioning latch 12 includes a first fixed shell 121, a first latch 122, a first return spring 125 and a first limiting rod 123, the first fixed shell 121 is fixedly connected to the sliding plate 11, the first fixed shell 121 is communicated with the sliding plate 11, the first latch 122 is slidably arranged in the first fixed shell 121, the first latch 122 is located at one end of the first fixed shell 121 close to the sliding plate 11, the first limiting rod 123 is fixed in the first fixed shell 121, the first limiting rod 123 is located at one end of the first fixed shell 121 away from the sliding plate 11, a sliding rod 124 is provided at one end of the first fixed shell 121 away from the sliding plate 11, the diameter of the sliding rod 124 is smaller than the diameters of the first latch 122 and the first limiting rod 123, the sliding rod 124 slides through the first limiting rod 123 and extends to the outside of the first fixed shell 121, and the first return spring 125 is arranged between the first limiting rod 123 and the first latch 122;

[0034] One end of the adjustment handle 21 is hinged to the sliding plate 11, and the other end of the adjustment handle 21 extends to one side of the seat 10. The end of the sliding rod 124 located outside the first fixed shell 121 is connected to the adjustment handle 21. When the position of the seat 10 needs to be adjusted, the trainer only needs to lift the end of the adjustment handle 21 located on one side of the seat 10. When the adjustment handle 21 is lifted, the first latch 122 will be pulled upward, and the first latch 122 will be disengaged from the first adjustment hole 271. The first return spring 125 is compressed, and the sliding plate 11 can slide at this time. After moving the sliding plate 11 to a suitable position, the trainer releases the adjustment handle 21, and the first return spring 125 loses its compression effect and returns to its original position. The first return spring 125 drives the first latch 122 to move downward, and the first latch 122 is inserted into the first adjustment hole 271 to fix the sliding plate 11. The method of adjusting the position of the seat 10 is simple and convenient, and the trainer can complete the adjustment on the seat 10.

[0035] Specifically, the chair 10 includes a seat plate 101 and a backrest 102, the seat plate 101 is fixedly connected to the sliding plate 11, seat armrests 26 are provided on both sides of the seat plate 101, and the trainee can hold the seat armrests to obtain support during training, the bottom end of the backrest 102 is hinged to the sliding plate 11, and the angle adjustment mechanism includes an adjustment rod 14 and an adjustment tube 13, one end of the adjustment tube 13 is hinged to the top of the backrest 102, and the other end of the adjustment tube 13 is slidably mounted on the outer wall of one end of the adjustment rod 14, and the other end of the adjustment rod 14 is hinged to the sliding plate 11, and a plurality of second adjustment holes 141 are provided on the adjustment rod 14 along the length direction, and a second positioning pin 15 matching the second adjustment hole 141 is provided on the adjustment tube 13. When the second positioning pin 15 is disengaged from the second adjustment hole 141 , the adjustment tube 13 can slide along the adjustment rod 14 to drive the backrest 102 to rotate, thereby adjusting the angle of the backrest 102 ; inserting the second positioning pin 15 into the second adjustment hole 141 can fix the adjustment tube 13 , thereby fixing the backrest 102 .

[0036] Specifically, a pin control mechanism for controlling the second positioning pin 15 to be inserted into / out of the second adjustment hole 141 is provided on one side of the seat plate 101, and a first gas spring 20 is provided on the rear side of the backrest 102. One end of the first gas spring 20 is hinged to the backrest 102, and the other end of the first gas spring 20 is hinged to the sliding plate 11. The first gas spring 20 can support the backrest 102 when adjusting the angle, thereby preventing the trainee from falling down instantly and improving the reliability of the adjustment.

[0037] Specifically, the second positioning latch 15 includes a second fixed shell 151, a second latch 154, a second return spring 153 and a second limiting rod 152. The second fixed shell 151 is fixedly connected to the adjustment tube 13, the second fixed shell 151 is communicated with the adjustment tube 13, the second latch 154 is slidably arranged in the second fixed shell 151, the second latch 154 is located at one end of the second fixed shell 151 close to the adjustment tube 13, the second limiting rod 152 is fixed in the second fixed shell 151, the second limiting rod 152 is located at one end of the second fixed shell 151 away from the adjustment tube 13, a wiring hole is provided in the second limiting rod 152, and the second return spring 153 is arranged between the second limiting rod 152 and the second latch 154;

[0038] The latch control mechanism includes a brake line 16 and a handle 28, the handle 28 is hinged on one side of the seat plate 101, one end of the brake line 16 is connected to the handle 28, and the other end of the brake line 16 passes through the wiring hole and the second return spring 153 and is connected to the second latch 154. When the angle of the backrest 102 needs to be adjusted, the trainer only needs to lift the handle 28, pull the brake line 16 through the handle 28, and the brake line 16 pulls the second latch 154, the second latch 154 is disengaged from the second adjustment hole 141, and the second return spring 153 is compressed. At this time, the adjustment tube 13 can slide. After adjusting the backrest 102 to a suitable angle, the trainer releases the handle 28, the second return spring 153 loses its compression effect and returns to its original position, and the second return spring 153 drives the second latch 154 to move, so that the second latch 154 is inserted into the second adjustment hole 141, fixes the adjustment tube 13, and thus fixes the backrest 102. The latch control mechanism allows the trainee to adjust the angle of the backrest 102 on the seat 10, which is convenient and simple to use. More specifically, a plurality of wiring tubes are provided on the rear side of the backrest 102, and the wiring tubes are used to limit the layout path of the brake wire 16, so that the brake wire 16 is neatly arranged and prevented from being caught by external objects.

[0039] Specifically, a second buffer block 22 is fixed on the sliding plate 11 . The second buffer block 22 is located at the rear side of the backrest 102 . The second buffer block 22 can protect the backrest 102 .

[0040] Specifically, the base frame 4 is a U-shaped frame, and there are two linkage arms 2, which are respectively located on both sides of the seat 10, and the front ends of the two linkage arms 2 are respectively connected to the two vertical rods of the U-shaped frame. A linkage rod 30 and a reset handle are arranged at the front side of the bottom end of the base frame 4, and the reset handle is hinged on the frame 1, one end of the linkage rod 30 is hinged to the base frame 4, and the other end of the linkage rod 30 is hinged to the reset handle, and the hinge point between the linkage rod 30 and the reset handle is located below the hinge point between the frame 1 and the reset handle; a third buffer block and a fourth buffer block are also fixed on the frame 1, the third buffer block is located at the front side of the bottom end of the base frame 4, and the fourth buffer block is located at the rear side of the top of the base frame 4, and the two buffer blocks play a protective and supporting role for the base frame 4; the trainer can rotate the base frame 4 by swinging the reset handle to adjust the state of the training machine, specifically, before training, push the reset handle forward so that the base frame 4 rests on the fourth buffer block at its rear side, and pull the reset handle back after stopping training.

[0041] Specifically, it also includes an adjustment arm 8 and an adjustment rod 9. The bottom end of the adjustment arm 8 is hinged to the front end of the linkage arm 2. The top end of the adjustment arm 8 is fixed to the first barbell shaft 7. One end of the adjustment rod 9 is hinged to the adjustment arm 8, and the other end of the adjustment rod 9 is hinged to the frame 1. The adjustment arm 8 and the adjustment rod 9 can realize the change of the force arm during the training process, and can increase the training weight as the trainee's legs stretch, while ensuring that the trainee can push up smoothly and the training weight meets the training requirements. More specifically, a safety hook is provided at the front end of the linkage arm 2. When the adjustment arm 8 falls off due to reasons such as the screw falling off, the safety hook can block the adjustment arm 8 to prevent the adjustment arm 8 from falling toward the seat 10, thereby preventing the adjustment arm 8 from hitting the trainee, providing safety protection for the user.

[0042] Specifically, the frame 1 is provided with an adjustable safety mechanism 17, which is located below the linkage arm 2. The adjustable safety mechanism 17 includes an adjustment handle 172, a fixed tube 174 and a moving rod 171. The fixed tube 174 is fixed on the frame 1. The moving rod 171 is slidably arranged in the fixed tube 174, and both ends of the moving rod 171 extend outside the fixed tube 174. The moving rod 171 is provided with a plurality of third adjustment holes along the length direction, and the fixed tube 174 is provided with a third positioning pin matching the third adjustment hole. The top of the moving rod 171 is provided with a first buffer block 173, and the adjustment handle 172 is fixed to the bottom of the moving rod 171. The adjustable safety mechanism 17 can prevent the linkage arm 2 from falling due to mistakes during training, thereby improving the safety of training.

[0043] The specific implementation methods of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the described implementation methods. For those skilled in the art, various changes, modifications, substitutions and variations of these implementation methods without departing from the principles and spirit of the present invention still fall within the scope of protection of the present invention.

Claims

1. An adjustable leg training machine, characterized in that: The invention comprises a frame (1), a base frame (4), a pedal board (5), a pedal board frame and a seat (10), wherein the pedal board frame comprises a linkage arm (2) and a fixed frame (3), wherein the bottom end of the base frame (4) is hinged to the frame (1), the top end of the base frame (4) is hinged to the front end of the linkage arm (2), the front end of the linkage arm (2) is connected to a first barbell shaft (7), the rear end of the linkage arm (2) is fixedly connected to the bottom end of the fixed frame (3), the rear end of the linkage arm (2) is hinged to the frame (1), the front side of the top end of the fixed frame (3) is connected to the pedal board (5), and the rear side of the fixed frame (3) is provided with a second barbell shaft (6), and the seat (10) is arranged on the frame (1) through a position adjustment mechanism and an angle adjustment mechanism, and the seat (10) is located on the front side of the base frame (4).

2. An adjustable leg training machine according to claim 1, characterized in that: The position adjustment mechanism comprises a sliding plate (11) and an adjustment plate (27); the adjustment plate (27) is fixedly connected to the frame (1); a plurality of first adjustment holes (271) are provided on the adjustment plate (27) along the front-rear direction; the sliding plate (11) is slidably arranged on the frame (1); a first positioning pin (12) matching the first adjustment hole (271) is provided on the sliding plate (11); and the seat (10) is arranged on the sliding plate (11).

3. An adjustable leg training machine according to claim 2, characterized in that: The sliding plate (11) is provided with an adjustment handle (21); the first positioning latch (12) comprises a first fixed shell (121), a first latch (122), a first return spring (125) and a first limit rod (123); the first fixed shell (121) is fixedly connected to the sliding plate (11); the first fixed shell (121) is communicated with the sliding plate (11); the first latch (122) is slidably arranged in the first fixed shell (121); the first latch (122) is located at one end of the first fixed shell (121) close to the sliding plate (11); the first limit rod (123) The first fixing member (121) is fixed in the first fixing shell (121), the first limiting rod (123) is located at one end of the first fixing shell (121) away from the sliding plate (11), the first latch (122) is provided with a sliding rod (124) at one end away from the sliding plate (11), the diameter of the sliding rod (124) is smaller than the diameters of the first latch (122) and the first limiting rod (123), the sliding rod (124) slides through the first limiting rod (123) and extends outside the first fixing shell (121), and the first return spring (125) is provided between the first limiting rod (123) and the first latch (122); One end of the adjustment handle (21) is hinged to the sliding plate (11), the other end of the adjustment handle (21) extends to one side of the seat (10), and one end of the sliding rod (124) located outside the first fixed shell (121) is connected to the adjustment handle (21).

4. An adjustable leg training machine according to claim 2, characterized in that: The seat (10) comprises a seat plate (101) and a backrest (102), wherein the seat plate (101) is fixedly connected to the sliding plate (11), and the bottom end of the backrest (102) is hinged to the sliding plate (11); the angle adjustment mechanism comprises an adjustment rod (14) and an adjustment tube (13), wherein one end of the adjustment tube (13) is hinged to the top end of the backrest (102), and the other end of the adjustment tube (13) is slidably sleeved on the outer wall of one end of the adjustment rod (14), and the other end of the adjustment rod (14) is hinged to the sliding plate (11); a plurality of second adjustment holes (141) are provided on the adjustment rod (14) along the length direction, and a second positioning pin (15) matching the second adjustment hole (141) is provided on the adjustment tube (13).

5. An adjustable leg training machine according to claim 4, characterized in that: A latch control mechanism for controlling the second positioning latch (15) to insert into / disengage from the second adjustment hole (141) is provided on one side of the seat plate (101).

6. An adjustable leg training machine according to claim 5, characterized in that: The second positioning latch (15) comprises a second fixed shell (151), a second latch (154), a second return spring (153) and a second limit rod (152); the second fixed shell (151) is fixedly connected to the regulating tube (13); the second fixed shell (151) is in communication with the regulating tube (13); the second latch (154) is slidably arranged in the second fixed shell (151); the second latch (154) is located at one end of the second fixed shell (151) close to the regulating tube (13); the second limit rod (152) is fixed in the second fixed shell (151); the second limit rod (152) is located at one end of the second fixed shell (151) away from the regulating tube (13); a wiring hole is provided in the second limit rod (152); and the second return spring (153) is arranged between the second limit rod (152) and the second latch (154); The latch control mechanism comprises a brake line (16) and a handle (28), wherein the handle (28) is hinged on one side of the seat plate (101), one end of the brake line (16) is connected to the handle (28), and the other end of the brake line (16) passes through a wiring hole and is connected to the second return spring (153) and the second latch (154).

7. An adjustable leg training machine according to claim 4, characterized in that: A second buffer block (22) is fixed on the sliding plate (11), and the second buffer block (22) is located at the rear side of the backrest (102).

8. An adjustable leg training machine according to claim 1, characterized in that: The base frame (4) is a U-shaped frame, and there are two linkage arms (2). The two linkage arms (2) are respectively located on two sides of the seat (10), and the front ends of the two linkage arms (2) are respectively connected to the two vertical rods of the U-shaped frame.

9. An adjustable leg training machine according to claim 1 or 7, characterized in that: It also includes an adjustment arm (8) and an adjustment rod (9), wherein the bottom end of the adjustment arm (8) is hinged to the front end of the linkage arm (2), the top end of the adjustment arm (8) is fixed to the first barbell shaft (7), one end of the adjustment rod (9) is hinged to the adjustment arm (8), and the other end of the adjustment rod (9) is hinged to the frame (1).

10. An adjustable leg training machine according to claim 1 or 7, characterized in that: The frame (1) is provided with an adjustable safety mechanism (17), the adjustable safety mechanism (17) being located below the linkage arm (2), the adjustable safety mechanism (17) comprising an adjustment handle (172), a fixed tube (174) and a moving rod (171), the fixed tube (174) being fixed on the frame (1), the moving rod (171) being slidably arranged in the fixed tube (174), and both ends of the moving rod (171) extending outside the fixed tube (174), the moving rod (171) being provided with a plurality of third adjustment holes along the length direction, the fixed tube (174) being provided with a third positioning pin matching the third adjustment holes, the top end of the moving rod (171) being provided with a first buffer block (173), and the adjustment handle (172) being fixed to the bottom end of the moving rod (171).

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