阅读说明：本技术 一种增强学生体能的训练装置 (Training device for enhancing physical ability of students ) 是由 来迎双 孙鑫 苏志亮 于 2021-09-17 设计创作，主要内容包括：一种增强学生体能的训练装置,包括斜支撑管,斜支撑管之间设置有固定管,斜支撑管顶端设置有滑轨管,滑轨管与斜支撑管之间设置有水平支撑管,滑轨管底部设置有底部支撑管,底部支撑管一侧面设置有臀垫支撑管,臀垫支撑管顶面设置有臀垫,底部支撑管一侧设置背垫水平管,背垫水平管之间设置有固定轴,固定轴中部设置有背垫斜撑管,背垫斜撑管与底部支撑管之间设置有背垫支撑管,背垫支撑管顶面设置有背垫,滑轨管上滑动连接有倒蹬组件；倒蹬组件的底面设置有第一限位组件；本发明优势：三种限位组件的结构不同,并且限位的原理也不相同；多重保护,来限制倒蹬组件的最低位置,避免学生脱力时,倒蹬组件滑下,导致学生腿部受伤。(A training device for enhancing physical performance of students comprises oblique supporting tubes, wherein a fixing tube is arranged between the oblique supporting tubes, a sliding rail tube is arranged at the top end of each oblique supporting tube, a horizontal supporting tube is arranged between the sliding rail tube and the oblique supporting tube, a bottom supporting tube is arranged at the bottom of the sliding rail tube, a buttock pad supporting tube is arranged on one side surface of the bottom supporting tube, a buttock pad is arranged on the top surface of the buttock pad supporting tube, a back pad horizontal tube is arranged on one side of the bottom supporting tube, a fixing shaft is arranged between the back pad horizontal tubes, a back pad oblique supporting tube is arranged in the middle of the fixing shaft, a back pad supporting tube is arranged between the back pad oblique supporting tube and the bottom supporting tube, a back pad is arranged on the top surface of the back pad supporting tube, and a back pedal assembly is slidably connected onto the sliding rail tube; the bottom surface of the back pedal component is provided with a first limiting component; the invention has the advantages that: the three limiting assemblies have different structures and different limiting principles; multiple protection limits the lowest position of the back-pedaling assembly, and prevents the back-pedaling assembly from sliding down to cause leg injury of students when the students take off the power.)

1. The utility model provides a training device of reinforcing student physical stamina which characterized in that: the hip pad comprises two inclined supporting tubes, the two inclined supporting tubes are parallel to each other, the bottom ends of the two inclined supporting tubes are in contact with the ground, a plurality of fixing tubes are arranged between the two inclined supporting tubes to fix the positions of the two inclined supporting tubes, slide rail tubes are respectively arranged at the top ends of the two inclined supporting tubes, the two slide rail tubes are parallel to each other, the bottom ends of the two slide rail tubes are in contact with the ground, a horizontal supporting tube is arranged between the slide rail tubes and the inclined supporting tubes, the slide rail tubes and the horizontal supporting tubes form a triangular structure, bottom supporting tubes are arranged at the bottoms of the two slide rail tubes, two hip pad supporting tubes are arranged on one side surface, close to the inclined supporting tubes, of the bottom supporting tubes, hip pads are arranged on the top surfaces of the hip pad supporting tubes, handrails are respectively arranged on the slide rail tubes on the two sides of the hip pads, a pair of back pad horizontal tubes is arranged in the middle of one side, far away from the inclined supporting tubes, of the bottom supporting tubes, the two back cushion horizontal pipes are of an L-shaped structure, the other ends of the two back cushion horizontal pipes are in contact with the ground, a fixed shaft is arranged between L-shaped corners of the two back cushion horizontal pipes, a back cushion inclined supporting pipe is arranged in the middle of the fixed shaft, a back cushion supporting pipe is arranged between the back cushion inclined supporting pipe and the bottom supporting pipe, a back cushion is arranged on the top surface of the back cushion supporting pipe, a headrest connecting pipe is telescopically connected to the top end of the back cushion supporting pipe, a headrest supporting pipe is arranged at the other end of the headrest connecting pipe, and a headrest is arranged at the top end of the headrest supporting pipe;

the slide rail pipe is connected with a back-pedal assembly in a sliding mode, and students can perform physical training by back-pedaling the back-pedal assembly;

the bottom surface of back pedal subassembly is provided with first spacing subassembly, comes the restriction the extreme low position of back pedal subassembly, avoids the student to be injured.

2. An exercise device for enhancing physical ability of a student as claimed in claim 1, wherein: the back-pedal component comprises a fixed seat, the top end and the bottom of two slide rail pipes are respectively provided with a fixed seat, a slide bar is arranged between the two fixed seats on the same slide rail pipe, slide sleeves are connected on the two slide bars in a sliding way, a sliding bottom plate is arranged between the two slide sleeves, the top surface of the sliding bottom plate is provided with a back-shaped pipe, the back-shaped pipe consists of two transverse pipes and two vertical pipes, the vertical pipes are arranged between the two ends of the two transverse pipes, the bottom surfaces of the vertical pipes are fixedly connected with the sliding bottom plate, the top surface of the transverse pipe close to one side of the hip pad is provided with a pair of back-pedal fixed pipes, the side wall of the back-pedal fixed pipe close to one side of the hip pad is provided with a back-pedal plate, a back-pedal support pipe is arranged between the back surface of the back-pedal plate and the vertical pipes, and the back-pedal support pipe, the vertical pipes and the back-pedal plate form a triangular structure, the top surfaces of the vertical pipes are provided with mounting seats, suspension shafts are arranged on the mounting seats, clamping rings are arranged on the left sides and the right sides of the suspension shafts, the end portions of the suspension shafts outside the clamping rings are upwards tilted, and two ends of each suspension shaft are used for suspending dumbbell pieces so as to increase the back-pedal weight.

3. An exercise device for enhancing physical ability of a student as claimed in claim 2, wherein: the first limiting assembly comprises limiting sliding plates, the two limiting sliding plates are arranged on the bottom surface of the transverse pipe, sliding blocks are arranged at two ends of the bottom surface of each limiting sliding plate, sliding grooves are formed in the top surfaces of the sliding rail pipes, sliding blocks are connected in the sliding grooves in a sliding mode, the lowest position of the back-pedal plate is limited through the length of the sliding grooves, and when the sliding blocks are located at the lowest end of the sliding grooves, the back-pedal plate is located at the lowest position.

4. An exercise device for enhancing physical ability of a student as claimed in claim 3, wherein: the slide rail pipe outside is provided with the spacing subassembly of second, further restricts the extreme low position of back-pedalling subassembly avoids the student to be injured.

5. An exercise device for enhancing physical ability of a student as claimed in claim 4, wherein: the second limiting assembly comprises a positioning block, the outer side of the slide rail pipe is provided with a positioning block, a screw hole is formed in the positioning block along the length direction of the positioning block, a screw rod is screwed in the screw hole, the bottom end of the screw rod is provided with a hand wheel, the top end of the screw rod is provided with a limiting plate, the top end of the limiting plate is provided with a U-shaped plate, the opening end of the U-shaped plate faces the limiting slide plate, the opening width of the U-shaped plate is matched with the thickness of the limiting slide plate, the lowest position of the limiting slide plate is limited through the U-shaped plate, and the lowest position of the back pedal plate is further limited;

the upper portion of the screw rod is connected with a limiting bolt in a threaded mode, and the side face of the limiting bolt is attached to the positioning block.

6. An exercise device for enhancing physical ability of a student as claimed in claim 5, wherein: a third limiting component is arranged between the back-pedaling plate and the hip pad, so that the legs of the students in the back-pedaling process are prevented from being straight, and the students are prevented from being injured.

7. An exercise device for enhancing physical ability of a student as claimed in claim 6, wherein: the third limiting component comprises a first hinged plate and a second hinged plate, the bottom end of the front side wall of the back pedal plate is hinged with the first hinged plate, the other end of the first hinged plate is hinged with a hinged shaft, the hinged shaft is hinged with the second hinged plate, the other end of the second hinged plate is hinged with the side wall of the hip pad, when a student takes exercise, the rear side of a thigh is tightly attached to the second hinged plate, the rear side of a shank is tightly attached to the first hinged plate, the bottom end of the front side wall of the back pedal plate is provided with a rotation limiting plate to limit the maximum rotation angle of the second hinged plate, and therefore the first hinged plate and the second hinged plate cannot be located on the same plane.

8. An exercise device for enhancing physical ability of a student as claimed in claim 7, wherein: the angle between the rotation limiting plate and the inverted pedal plate is 70-80 degrees.

9. An exercise device for enhancing physical ability of a student as claimed in claim 7, wherein: the third limiting assembly is used for limiting the maximum angle between the first hinge plate and the second hinge plate, and further preventing the first hinge plate and the second hinge plate from being in the same plane.

10. An exercise device for enhancing physical ability of a student as claimed in claim 9, wherein: the fourth limiting assembly comprises a limiting telescopic rod, the length of the limiting telescopic rod can be changed in a telescopic mode, the limiting telescopic rod is arranged between the bottom end of the front side wall of the back-pedal plate and the side wall of the hip pad, when the first hinged plate and the second hinged plate are at the maximum angle, the end portion of the hinged shaft is in contact with the limiting telescopic rod, the hinged shaft cannot continue to move downwards, the first hinged plate and the second hinged plate cannot continue to be unfolded, and finally, when a student backs-pedals, the legs cannot be completely straight, and the student is prevented from being injured.

Technical Field

The invention relates to a training device, in particular to a training device for enhancing physical ability of students.

Background

Lower limb strength training is a common practice in physical training, and in order to increase the strength of lower limb strength training, weight training is generally adopted. Kicking is a common training method for lower limb strength weight training.

However, the conventional training device has no protection function when the load moves down, and is easy to injure the legs of students during training, thereby causing injuries.

In view of the above, there is a need for a training device for enhancing physical ability of students to meet the requirements of safety training of students.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides a training device for enhancing physical ability of students, which has multiple protection functions and avoids the students from being injured during training.

The purpose of the invention is realized as follows:

a training device for enhancing physical performance of students comprises two inclined supporting tubes, wherein the two inclined supporting tubes are parallel to each other, the bottoms of the two inclined supporting tubes are in contact with the ground, a plurality of fixing tubes are arranged between the two inclined supporting tubes to fix the positions of the two inclined supporting tubes, slide rail tubes are respectively arranged at the top ends of the two inclined supporting tubes, the two slide rail tubes are parallel to each other, the bottoms of the two slide rail tubes are in contact with the ground, a horizontal supporting tube is arranged between the slide rail tubes and the inclined supporting tubes, the slide rail tubes and the horizontal supporting tubes form a triangular structure, bottom supporting tubes are arranged at the bottoms of the two slide rail tubes, two hip pad supporting tubes are arranged on one side surface of the bottom supporting tubes close to the inclined supporting tubes, hip pads are arranged on the top surfaces of the hip pad supporting tubes, handrails are respectively arranged on the slide rail tubes on two sides of the hip pads, a pair of back cushion horizontal pipes are arranged in the middle of one side, away from the inclined supporting pipe, of the bottom supporting pipe, the two back cushion horizontal pipes are of an L-shaped structure, the other ends of the two back cushion horizontal pipes are in contact with the ground, a fixed shaft is arranged between L-shaped corners of the two back cushion horizontal pipes, a back cushion inclined supporting pipe is arranged in the middle of the fixed shaft, a back cushion supporting pipe is arranged between the back cushion inclined supporting pipe and the bottom supporting pipe, a back cushion is arranged on the top surface of the back cushion supporting pipe, a headrest connecting pipe is connected to the top end of the back cushion supporting pipe in a telescopic mode, a headrest supporting pipe is arranged at the other end of the headrest connecting pipe, and a headrest is arranged at the top end of the headrest supporting pipe;

the slide rail pipe is connected with a back-pedal assembly in a sliding mode, and students can perform physical training by back-pedaling the back-pedal assembly;

the bottom surface of back pedal subassembly is provided with first spacing subassembly, comes the restriction the extreme low position of back pedal subassembly, avoids the student to be injured.

Further, the back-pedal assembly comprises a fixed seat, the top and bottom of the two slide rail pipes are respectively provided with a fixed seat, a slide bar is arranged between the two fixed seats on the same slide rail pipe, the two slide bars are both connected with a slide sleeve in a sliding manner, a sliding bottom plate is arranged between the two slide sleeves, the top surface of the sliding bottom plate is provided with a back-shaped pipe, the back-shaped pipe is composed of two transverse pipes and two vertical pipes, the vertical pipes are arranged between the two ends of the two transverse pipes, the bottom surface of each vertical pipe is fixedly connected with the sliding bottom plate, the top surface of the transverse pipe close to one side of the hip pad is provided with a pair of back-pedal fixed pipes, the side wall of the back-pedal fixed pipe close to one side of the hip pad is provided with a back-pedal plate, a back-pedal support pipe is arranged between the back surface of the back-pedal plate and the vertical pipes, and the back-pedal support pipe, the vertical pipes and the back-pedal plate form a triangular structure, two the standpipe top surface all is provided with the fixing base, two be provided with the hanging spindle on the fixing base, the left and right sides of hanging spindle is provided with the snap ring, the snap ring outside hang the tip of axle perk upwards, the both ends of hanging spindle are used for hanging the dumbbell piece to increase back-pedalling weight.

Further, the first limiting assembly comprises limiting sliding plates, the bottom surfaces of the two transverse pipes are provided with the limiting sliding plates, sliding blocks are arranged at two ends of the bottom surface of each limiting sliding plate, sliding grooves are formed in the top surfaces of the two sliding rail pipes, sliding blocks are connected in the sliding grooves in a sliding mode, the lowest position of the inverted pedal plate is limited through the length of the sliding grooves, and when the sliding blocks are located at the lowest end of the sliding grooves, the inverted pedal plate is located at the lowest position.

Further, the slide rail pipe outside is provided with the spacing subassembly of second, further restricts the extreme lower position of back-pedal subassembly avoids the student to be injured.

Further, the second limit component comprises a locating block, a locating block is arranged on the outer side of the slide rail pipe, a screw hole is formed in the locating block along the length direction of the locating block, a screw rod is connected with the screw hole in a threaded mode, a hand wheel is arranged at the bottom end of the screw rod, a limiting plate is arranged at the top end of the screw rod, a U-shaped plate is arranged at the top end of the limiting plate, the opening end of the U-shaped plate faces towards the limit slide plate, the opening width of the U-shaped plate is matched with the thickness of the limit slide plate, the U-shaped plate limits the lowest position of the limit slide plate, and therefore the lowest position of the back pedal plate is limited.

Furthermore, a third limiting assembly is arranged between the back-pedaling plate and the hip pad, so that the legs of the students in the back-pedaling process are prevented from being straight, and the students are prevented from being injured.

Furthermore, the third limiting component comprises a first hinged plate and a second hinged plate, the bottom end of the front side wall of the back pedal plate is hinged with the first hinged plate, the other end of the first hinged plate is hinged with a hinged shaft, the hinged shaft is hinged with the second hinged plate, the other end of the second hinged plate is hinged with the side wall of the hip pad, when a student takes exercise, the rear side of a thigh is tightly attached to the second hinged plate, the rear side of a shank is tightly attached to the first hinged plate, and the bottom end of the front side wall of the back pedal plate is provided with a rotation limiting plate to limit the maximum rotation angle of the second hinged plate, so that the first hinged plate and the second hinged plate cannot be located on the same plane.

Further, the angle between the rotation limiting plate and the inverted pedal plate is 70-80 degrees.

Further, a fourth limiting assembly is further included to limit the maximum angle between the first hinge plate and the second hinge plate in the third limiting assembly, and further the first hinge plate and the second hinge plate are prevented from being in the same plane.

Further, the fourth limiting assembly comprises a limiting telescopic rod, the limiting telescopic rod can stretch out and draw back to change the length of the fourth limiting assembly, the limiting telescopic rod is arranged between the bottom end of the front side wall of the back-pedal plate and the side wall of the hip pad, when the first hinged plate and the second hinged plate are at the maximum angle, the end part of the hinged shaft is in contact with the limiting telescopic rod, the hinged shaft cannot continue to move downwards, the first hinged plate and the second hinged plate cannot continue to be flattened, and therefore when a student backs-pedals, the legs cannot be completely straight, and the student is prevented from being injured.

The advantages of the invention are as follows:

1. the structure of the first limiting assembly, the second limiting assembly and the third limiting assembly is different, and the limiting principle is different. Multiple protection limits the lowest position of the back-pedaling assembly, and prevents the back-pedaling assembly from sliding down to cause leg injury of students when the students take off the power.

2. The maximum angle between the first hinge plate and the second hinge plate is further limited by the fourth limiting assembly in cooperation with the third limiting assembly. And furthermore, the problem that when the back-pedaling training is carried out, the legs are pressed to be continuously bent outwards under the action of the gravity of the back-pedaling assembly after the legs are pedaled to be straight, so that the legs are injured is avoided.

Drawings

FIG. 1 is a schematic diagram of a training device for enhancing the performance of a student.

Fig. 2 is a schematic structural view of the first limiting assembly.

Fig. 3 is a schematic structural view of a second limiting assembly.

Fig. 4 is a schematic structural diagram of a third limiting assembly and a fourth limiting assembly.

Fig. 5 is a schematic structural view of the back-pedal assembly.

FIG. 6 is a schematic diagram of a second training device for enhancing the performance of a student.

In the figure: 1. the back cushion comprises an inclined supporting pipe, 2. a fixed pipe, 3. a slide rail pipe, 4. a horizontal supporting pipe, 5. a bottom supporting pipe, 6. a hip cushion supporting pipe, 7. a hip cushion, 8. a handrail, 9. a back cushion horizontal pipe, 10. a fixed shaft, 11. a back cushion inclined supporting pipe, 12. a back cushion supporting pipe, 13. a back cushion, 14. a headrest connecting pipe, 15. a headrest supporting pipe, 16. a headrest, 17. a back pedal component, 18. a fixed seat, 19. a slide rod, 20. a slide sleeve, 21. a sliding bottom plate, 22. a transverse pipe, 23. a vertical pipe, 24. a back pedal fixed pipe, 25. a back pedal plate, 26. an indication groove, 27. a back pedal supporting pipe, 28. a mounting seat, 29. a suspension shaft, 30. a snap ring, 31. a first limit component, 32. a limit sliding plate, 33. a slide block, 34. a slide groove, 35. a second limit component, 36. a positioning block, 37. a screw hole, 38. a screw, 39. a hand wheel, 40. a U-shaped plate, 41. a U-shaped plate, 42. The limiting bolt, 43, the third limiting assembly, 44, the first hinged plate, 45, the second hinged plate, 46, the hinged shaft, 47, the rotation limiting plate, 48, the fourth limiting assembly and 49, the limiting telescopic rod.

Detailed Description

In order to make the technical solutions in the embodiments of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The embodiment of the application provides a training device for enhancing the energy of a student.

Example 1, as shown in FIGS. 1-6.

The utility model provides a reinforcing student physical training device, includes two bearing diagonal pipes 1, two bearing diagonal pipe 1 is parallel to each other, two 1 bottom and the ground contact of bearing diagonal pipe. A plurality of fixing pipes 2 are arranged between the two inclined supporting pipes 1 so as to fix the positions of the two inclined supporting pipes 1. The top ends of the two inclined supporting tubes 1 are respectively provided with a slide rail tube 3, the two slide rail tubes 3 are parallel to each other, and the bottom ends of the two slide rail tubes 3 are in contact with the ground. A horizontal supporting pipe 4 is arranged between the slide rail pipe 3 and the inclined supporting pipe 1. The inclined supporting tube 1, the slide rail tube 3 and the horizontal supporting tube 4 form a triangular structure, so that the integral structure is more stable.

Two bottom stay tubes 5 are arranged at the bottoms of the slide rail tubes 3, two buttock pad stay tubes 6 are arranged on one side face, close to the inclined stay tube 1, of the bottom stay tube 5, buttock pads 7 are arranged on the top faces of the buttock pad stay tubes 6, and during training, the buttocks of students are tightly attached to the buttock pads 7. The slide rail pipes 3 on the two sides of the hip pad 7 are respectively provided with handrails 8, so that the user can conveniently grasp and apply force during training.

The middle part of one side of the bottom supporting tube 5 far away from the inclined supporting tube 1 is provided with a pair of back cushion horizontal tubes 9, the two back cushion horizontal tubes 9 are of L-shaped structures, and the other ends of the two back cushion horizontal tubes 9 are in contact with the ground. Two be provided with fixed axle 10 between the L shape corner of back of the body pad horizontal pipe 9, fixed axle 10 middle part is provided with back of the body pad bracing tube 11, be provided with back of the body pad stay tube 12 between back of the body pad bracing tube 11 and the bottom stay tube 5, back of the body pad stay tube 12 top surface is provided with back of the body pad 13, and during the training, student's back is hugged closely back of the body pad 13. The top end of the back cushion supporting tube 12 is telescopically connected with a headrest connecting tube 14, and the headrest connecting tube 14 is inserted into the inner cavity of the back cushion supporting tube 12 and detachably connected through a bolt. The extension length of the headrest connecting pipe 14 can be adjusted in real time according to the height of the student. The other end of the headrest connecting pipe 14 is provided with a headrest supporting pipe 15, the top end of the headrest supporting pipe 15 is provided with a headrest 16, and the head of a student leans against the headrest 16 during training.

The slide rail tube 3 is connected with a back-pedal component 17 in a sliding way, and students can perform physical training by back-pedal the back-pedal component 17.

The back-pedal assembly 17 comprises fixing seats 18, and the fixing seats 18 are respectively arranged at the top ends and the bottom ends of the two slide rail pipes 3. A sliding rod 19 is arranged between the two fixed seats 18 on the same sliding rail pipe 3, sliding sleeves 20 are connected to the two sliding rods 19 in a sliding mode, and the sliding sleeves 20 can slide along the sliding rods 19. Two be provided with sliding bottom plate 21 between sliding sleeve 20, sliding bottom plate 21 top surface is provided with the return pipe, the return pipe comprises two violently pipes 22 and two standpipe 23, two all be provided with between the both ends of violently pipe 22 standpipe 23. The bottom surface of the vertical tube 23 is fixedly connected with the sliding bottom plate 21, the top surface of the transverse tube 22 close to one side of the hip pad 7 is provided with a pair of inverted pedal fixing tubes 24, and the side wall of the inverted pedal fixing tube 24 close to one side of the hip pad 7 is provided with an inverted pedal 25. During training, the student kicks up the reverse pedal plate 25 to complete the reverse pedal training. The inverted pedal plate 25 is provided with an indication groove 26, and when a foot steps on the middle part of the indication groove 26, the whole thigh part is exercised; exercising the thigh inner portion while stepping inside the indicating groove 26; when stepping on the outside of the indicating groove 26, the thigh outer part is exercised. A back pedal support tube 27 is provided between the back of the back pedal plate 25 and the vertical tube 23. The inverted pedal support tube 27, the vertical tube 23 and the inverted pedal 25 form a triangular structure, so that the overall structure is more stable, and the stability of the inverted pedal 25 is further enhanced. The top surfaces of the two vertical pipes 23 are provided with mounting seats 28, and suspension shafts 29 are arranged on the two mounting seats 28. The left side and the right side of the hanging shaft 29 are provided with clamping rings 30, and two ends of the hanging shaft 29 are used for hanging dumbbell pieces so as to increase the back pedaling weight. The end part of the suspension shaft 29 outside the snap ring 30 is tilted upwards, and the dumbbell sheet can be prevented from moving in the back pedaling process through the snap ring 30 and the two ends of the suspension shaft 29 tilted upwards.

The bottom surface of the back-pedaling assembly 17 is provided with a first limiting assembly 31 for limiting the lowest position of the back-pedaling assembly so as to prevent the student from being injured.

First spacing subassembly 31 includes spacing slide 32, two violently manage 22 bottom surface and all be provided with spacing slide 32, spacing slide 32 bottom surface both ends all are provided with slider 33, two spout 34 has all been seted up to slide rail pipe 3 top surface, sliding connection has slider 33 in the spout 34. The slide groove 34 can limit the lowest position of the inverted pedal 25 on one hand and protect the legs of the student from being damaged. When the slide block 33 is at the lowest end of the slide groove 34, the inverted pedal 25 is at the lowest position; on the other hand, the stability of the kicker plate 25 in sliding during kicking can be further increased.

The outside of the slide rail pipe 3 is provided with a second limiting component 35, so that the lowest position of the back-pedal component 17 is further limited, and the student is prevented from being injured.

The second limiting component 35 comprises a positioning block 36, a positioning block 36 is arranged on the outer side of the slide rail tube 3, a screw hole 37 is formed in the positioning block 36 along the length direction of the positioning block, a screw 38 is screwed in the screw hole 37, a hand wheel 39 is arranged at the bottom end of the screw 38, a limiting plate 40 is arranged at the top end of the screw 38, a U-shaped plate 41 is arranged at the top end of the limiting plate 40, the opening end of the U-shaped plate 41 faces the limiting slide plate 32, the opening width of the U-shaped plate 41 is matched with the thickness of the limiting slide plate 32, and the limiting slide plate 32 is limited by the U-shaped plate 41 in the lowest position so as to limit the lowest position of the back-pedal plate 25. The upper part of the screw rod 38 is in threaded connection with a limiting bolt 42, and the side surface of the limiting bolt 42 is attached to the positioning block 36.

The limiting bolt 42 is unscrewed, and then the hand wheel 39 is rotated, so that the screw rod 38 can be screwed up and screwed down, and the position of the U-shaped plate 41 is moved, so as to adjust the limited position of the back-pedal assembly 17, and finally, the student is ensured not to be injured during training.

A third limiting component 43 is arranged between the back-pedalling plate 25 and the hip pad 7 to prevent the legs of the students from being pedaled straight in the back-pedalling process and prevent the students from being injured.

The third limiting component 43 comprises a first hinge plate 44 and a second hinge plate 45, the bottom end of the front side wall of the back pedal plate 25 is hinged with the first hinge plate 44, the other end of the first hinge plate 44 is hinged with a hinge shaft 46, the hinge shaft 46 is hinged with the second hinge plate 45, the other end of the second hinge plate 45 is hinged with the side wall of the hip pad 7, when a student exercises, the back side of the thigh is tightly attached to the second hinge plate 45, the back side of the calf is tightly attached to the first hinge plate 44, and the bottom end of the front side wall of the back pedal plate 25 is provided with a rotation limiting plate 47 to limit the maximum rotation angle of the second hinge plate 45, so that the first hinge plate 44 and the second hinge plate 45 cannot be located on the same plane. The angle between the rotation limiting plate 47 and the kickback plate 25 is 70-80 degrees. When the angle between the first hinge plate 44 and the second hinge plate 45 reaches the maximum, the bottom surface of the first hinge plate 44 contacts the rotation limiting plate 47, the first hinge plate 44 is limited by the rotation limiting plate 47 to rotate downwards continuously, the angle between the first hinge plate 44 and the second hinge plate 45 cannot be increased continuously, and finally, the knee joint cannot be locked when a student pedals backwards, so that the legs are protected, and injuries are avoided.

A fourth limiting assembly 48 is further included to limit the maximum angle between the first hinge plate 44 and the second hinge plate 45 in the third limiting assembly 43, and further to prevent the first hinge plate 44 and the second hinge plate 45 from being in the same plane.

The fourth limiting assembly 48 comprises a limiting telescopic rod 49, the limiting telescopic rod 49 can stretch and contract to change the length of the limiting telescopic rod 49, the limiting telescopic rod 49 is arranged between the bottom end of the front side wall of the back-pedal plate 25 and the side wall of the hip pad 7, when the first hinged plate 44 and the second hinged plate 45 are at the maximum angle, the end part of the hinged shaft 46 is in contact with the limiting telescopic rod 49, the hinged shaft 46 cannot continue to move downwards, further the first hinged plate 44 and the second hinged plate 45 cannot continue to be unfolded, and finally, when a student backs down, the leg cannot be completely pedaled straight, so that the student is prevented from being injured.

When the invention is used:

before training, a student selects proper weight of the dumbbell pieces, and the dumbbell pieces are symmetrically hung at two ends of the hanging shaft, so that training can be started.

Then according to student's shank length, adjust the U-shaped board position in the spacing subassembly of second, make and be in suitable position, come full play protective action.

During training, a student lies on the back cushion, the buttocks cling to the buttocks cushion, the back cling to the back cushion, and the head naturally rests on the headrest. The feet step on the indicating grooves of the inverted pedal according to the training requirement. The back pedaling training is started. In the training process, the first limiting component, the second limiting component, the third limiting component and the fourth limiting component protect students in different modes respectively to avoid injuries.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims. It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.