Sit-and-reach constraint exercise device for physical training

Abstract

The invention relates to the field of physical training articles, and discloses a physical training sitting and sitting body forward bending constraint exercise device which comprises a base plate and a limiting plate arranged at one end of the base plate. A training arm is movably arranged at the end, close to the limiting plate, of the base plate, and a training handle is arranged at the end, close to the limiting plate, of the training arm; a cushion is movably arranged at the end, away from the limiting plate, of the base plate, a mounting groove is formed in the bottom of the base plate, and a traction plate extending to the inner side of the mounting groove is arranged at one end of the bottom of the cushion. According to the sit-and-reach constraint exercise device for physical training, when a user sits down and pushes the cushion to move, the feet and the knees can be automatically limited through the foot constraint plate and the knee constraint plate respectively, separation of the feet and the limiting plates and upward bending of the knees during training are avoided, the accuracy of training data is improved, and the training efficiency is improved. And a standard posture can be conveniently formed.

Description

Technical Field

[0001] The present invention relates to the field of sports training equipment, and in particular to a sitting forward bend restraint exercise device for sports training. Background Art

[0002] The sitting forward bend test device commonly used in the current sports training field mainly consists of a horizontal base, a cushion, a vertically arranged foot limiting plate and a scale ruler. The user needs to maintain a sitting position on the base, with the soles of both feet completely adhering to the surface of the vertical limiting plate, the legs straight and parallel to the ground. By stretching the arms forward to push the sliding measuring plate, the amplitude of the trunk forward bend is quantified using the ruler. This device uses a physical limiting plate to constrain the initial position of the feet and, in combination with the ruler system, realizes the basic forward bend flexibility measurement function to meet the basic needs of conventional physical fitness tests.

[0003] However, the existing device exposes significant functional defects during training: its vertical limiting plate only fixes the feet relying on the frictional force of the contact surface, lacking an active restraint mechanism, resulting in the phenomenon that the knees bend involuntarily and the heels slip off the limiting plate when the user exerts force to bend forward. This dynamic imbalance not only causes the measurement data to be distorted, but also prompts the trainer to form compensatory incorrect movement patterns such as arched backs and bent knees. Long-term use will solidify non-standard test postures and reduce the training effectiveness.

[0004] Therefore, it is very necessary to propose a sitting forward bend restraint exercise device for sports training to solve the above problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defects existing in the prior art. The present invention proposes a sitting forward bend restraint exercise device for sports training, which solves the problems in the prior art that there is a lack of an active restraint mechanism during sitting forward bend, which is likely to cause the measurement data to be distorted and solidify non-standard test postures.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows: A sitting forward bend restraint exercise device for sports training, including a base plate and a limiting plate provided at one end of the base plate; A training arm is movably provided at one end of the base plate close to the limiting plate, and a training handle is provided at one end of the training arm close to the limiting plate; A cushion is movably provided at one end of the base plate away from the limiting plate. An installation groove is provided at the bottom of the base plate. One end of the bottom of the cushion is provided with a traction plate extending to the inside of the installation groove. A first elastic member is provided between the side of the traction plate away from the limiting plate and one end of the inner cavity of the installation groove away from the limiting plate; It further includes a binding component, which includes moving frames movably arranged on both sides of the inner cavity of the installation groove near one end of the limiting plate. One end of the moving frame is provided with a second moving arm extending to the top of the substrate. The upper end of the second moving arm is provided with a foot binding plate. One end of the moving frame away from the second moving arm is provided with a first moving arm extending to the top of the substrate. A knee binding plate is arranged on one side of the first moving arm; A driving component for driving the displacement of the moving frame is arranged in the inner cavity of the installation groove. The driving component includes a rotating rod rotatably arranged at one end of the inner cavity of the installation groove. A driving cylinder corresponding to the rotating rod is fixed at the bottom of the traction plate. One end of the rotating rod is movably connected to the inner side of the driving cylinder. A spiral first guide groove is arranged on the outer wall of one end of the rotating rod. A guide block is arranged on the inner wall of one end of the driving cylinder and is in movable guiding cooperation with the first guide groove. A rack is arranged at one end of the bottom of the moving frame. A gear meshing with the rack is arranged at one end of the rotating rod.

[0007] Preferably, a foot plate having the same height as the seat cushion is arranged at the lower end of the side of the limiting plate close to the seat cushion. A heel limiting groove is arranged in a downward concave shape at one end of the foot plate close to the limiting plate.

[0008] Preferably, a height adjustment component for adjusting the height of the knee binding plate is arranged on the first moving arm. The height adjustment component includes a lifting seat vertically and movably connected to the inner side of the first moving arm. One end of the knee binding plate is fixed to one side of the lifting seat. A locking tooth is movably connected to the inner side wall of the lifting seat. A fourth elastic member is arranged between the locking tooth and the inner side wall of the lifting seat. A locking plate is arranged at one end of the inner side of the first moving arm. Locking grooves adapted to the locking teeth are uniformly arranged along the height direction on one side of the locking plate. The locking tooth is arranged obliquely upward and is in clamping cooperation with the locking groove. A second elastic member is arranged between the bottom of the lifting seat and the inner bottom of the first moving arm.

[0009] Preferably, a horizontal adjustment component is arranged between the knee binding plate and the lifting seat. The horizontal adjustment component includes an adjustment frame arranged on one side of the lifting seat. An adjustment screw rod is rotatably arranged on one side of the adjustment frame. One end of the knee binding plate is threadedly connected to the adjustment screw rod.

[0010] Preferably, a second guide groove communicating with the first guide groove and having a smooth inner wall transition is arranged on the outer wall of one end of the rotating rod close to the driving cylinder. The second guide groove is parallel to the axis of the rotating rod.

[0011] Preferably, the locking plate is horizontally and movably connected to one end of the inner side of the first moving arm. A third elastic member is arranged between one side of the locking plate and one end of the inner side of the first moving arm; One end of the installation groove is provided with an unlocking component. The unlocking component includes a pushing arm arranged on one side of the lower end of the locking plate, and one end of the pushing arm extends to the outside of the first moving arm. One end of the inner cavity of the installation groove close to the limiting plate is fixed with a fixing plate. An unlocking plate is movably arranged on one side of the fixing plate close to the limiting plate. A fifth elastic member is arranged between the unlocking plate and the fixing plate. The end of the unlocking plate corresponds to the pushing arm and is used to push the pushing arm to displace. A stress arm extending to the top of the substrate is arranged on one side of the unlocking plate close to the training arm, and the upper end of the stress arm corresponds to the lower end of the training arm.

[0012] Preferably, a roller for rolling cooperation with the side wall of the unlocking plate is rotatably arranged at one end of the pushing arm close to the unlocking plate.

[0013] Preferably, a cursor is movably connected to the upper end of the training arm, and a scale corresponding to the cursor is arranged at the upper end of the training arm.

[0014] Preferably, flexible or elastic pads are arranged on the bottom of the knee restraint plate and on the side of the foot restraint plate facing the limiting plate.

[0015] Preferably, a protruding waist stop is arranged at one end of the top of the seat cushion away from the limiting plate.

[0016] Compared with the prior art, the beneficial effects of the present invention include: For this sit-and-reach restraint and exercise device for physical training, through the movable seat cushion arranged at one end of the substrate, in cooperation with the traction plate and the first elastic member, when the user straightens the legs and pushes the seat cushion to move backward, the contraction force of the first elastic member will be transmitted to the buttocks through the seat cushion, forming a reverse balance force against the feet pressing against the limiting plate, reducing the front-back shaking of the body and enhancing the stability of the movement. For this sit-and-reach restraint and exercise device for physical training, through the arranged limiting component in cooperation with the driving component linked to the displacement of the seat cushion, it can automatically limit the feet and knees respectively through the foot restraint plate and the knee restraint plate when the user sits down and pushes the seat cushion to move, avoiding the separation of the feet from the limiting plate and the upward bending of the knees during training, improving the accuracy of training data, and also facilitating the formation of standard postures; through the arranged height adjustment component, the knees can be further pressed after sitting flat to adapt to different users, and the horizontal adjustment component can adjust the horizontal position of the knee restraint plate, which is also convenient for adapting to different users. For this sit-and-reach restraint and exercise device for physical training, through the arranged unlocking component in cooperation with the training arm, the knee restraint plate can be unlocked and lifted by pulling the training arm forward after the training is over, facilitating the bending of the knees, thereby realizing the removal of the knee restraint plate and the foot restraint plate, making it convenient for the user to get up and leave, with convenient operation and increased practicality. Description of the Drawings

[0017] The disclosure of the present invention will be described with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. In the drawings, the same reference numerals are used to refer to the same components. Among them: Figure 1 Schematically shows a schematic structural diagram of the present invention; Figure 2 Schematically shows a schematic structural diagram of the bottom view of the present invention; Figure 3 Schematically shows a schematic structural diagram of the present invention in a disassembled state; Figure 4 Schematically shows the present invention Figure 3 A schematic structural diagram of another perspective based on this; Figure 5 Schematically shows a schematic structural diagram of the present invention in the cooperating state of the driving cylinder, the rotating rod, the first moving arm, the foot restraint plate, and the unlocking plate; Figure 6 Schematically shows a schematic structural diagram of the rotating rod of the present invention; Figure 7 Schematically shows a schematic overall structural diagram of the foot restraint plate and the first moving arm of the present invention; Figure 8 Schematically shows the present invention Figure 7 A schematic structural diagram of another perspective based on this; Figure 9 Schematically shows a schematic structural diagram of the present invention in the disassembled state of the first moving arm, the knee restraint plate, and the locking plate; Figure 10 Schematically shows the present invention Figure 9 A schematic structural diagram of another perspective based on this; Figure 11 Schematically shows a schematic cross-sectional structural diagram of one end of the driving cylinder of the present invention; Figure 12 Schematically shows a schematic structural diagram of the present invention in the disassembled state of the force arm and the training arm; Figure 13 Schematically shows a schematic structural diagram of the foot plate and the limiting plate of the present invention.

[0018] Reference numerals in the figure: 1, substrate; 2, seat cushion; 3, limiting plate; 4, training arm; 5, foot plate; 6, cursor; 7, training handle; 8, first moving arm; 9, mounting groove; 10, driving cylinder; 11, rotating rod; 12, first elastic member; 13, traction plate; 14, force-bearing arm; 15, rack; 16, knee restraint plate; 17, foot restraint plate; 18, moving frame; 19, second moving arm; 20, roller; 21, unlocking plate; 22, fixing plate; 23, gear; 24, first guide groove; 25, second guide groove; 26, pushing arm; 27, adjusting frame; 28, second elastic member; 29, lifting seat; 30, locking plate; 31, third elastic member; 32, locking tooth; 33, fourth elastic member; 34, locking groove; 35, adjusting screw rod; 36, guide block; 37, fifth elastic member; 38, heel limiting groove; 39, waist stop. Detailed implementation manners

[0019] It is easy to understand that according to the technical solution of the present invention, without changing the essence of the present invention, those of ordinary skill in the art can propose various structural ways and implementation ways that can be mutually replaced. Therefore, the following detailed implementation manners and the accompanying drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as all of the present invention or as a limitation or restriction on the technical solution of the present invention.

[0020] According to an embodiment of the present invention, it is combined with Figures 1 - 13 shown as follows.

[0021] As Figure 1 shown, a sit-and-reach restraint exercise device for physical training includes a substrate 1 and a limiting plate 3 provided at one end of the top of the substrate 1 for limiting and blocking the feet. A training arm 4 is movably provided at one end of the substrate 1 close to the limiting plate 3. Specifically, a linear guide rail is provided at one end of the top of the substrate 1, and the lower end of the training arm 4 is movably connected to the linear guide rail. The training arm 4 is in an "L" shape, and its upper end is movably connected to the top of the limiting plate 3. A training handle 7 is provided at one end of the training arm 4 close to the limiting plate 3. The training handle 7 can be used to pull the training arm 4 during training. In addition, the training arm 4 can also act as a test structure when measuring the sit-and-reach. Specifically, a cursor 6 is movably connected to the upper end of the training arm 4, and a scale corresponding to the cursor 6 is provided at the upper end of the training arm 4. Therefore, the test can also be realized by pushing the cursor 6 to displace with the middle finger against the cursor 6; As Figures 1 - 5As shown, in order to increase the stability of the user during training, a seat cushion 2 is movably arranged at one end of the substrate 1 away from the limit plate 3. Specifically, a linear guide rail is arranged on the side wall at one end of the substrate 1, and the seat cushion 2 is movably connected to the outside of the linear guide rail. A protruding waist stop 39 is arranged at one end of the top of the seat cushion 2 away from the limit plate 3. An installation groove 9 is arranged at the bottom of the substrate 1. One end of the bottom of the seat cushion 2 is provided with a traction plate 13 extending into the inner side of the installation groove 9. The traction plate 13 is movably connected to the substrate 1. A first elastic member 12 is arranged between one side of the traction plate 13 away from the limit plate 3 and one end of the inner cavity of the installation groove 9 away from the limit plate 3. The first elastic member 12 is preferably a spring. And in order to increase the stability of the first elastic member 12, a guide rod is arranged at one end of the inner cavity of the installation groove 9. The traction plate 13 is movably sleeved on the guide rod, and the first elastic member 12 is sleeved on one end of the guide rod; As Figures 1 - 11 , Figure 13As shown, in order to further increase the stability of the user, the moving frames 18 are movably arranged on both sides of the inner cavity of the installation groove 9 near one end of the limiting plate 3. Specifically, linear guide rails corresponding to the moving frames 18 are arranged on the inner side of the installation groove 9, and the moving frames 18 are movably connected to the linear guide rails. At the lower end of the side of the limiting plate 3 close to the seat cushion 2, there is a foot plate 5 at the same height as the seat cushion 2. At one end of the foot plate 5 close to the limiting plate 3, there is a heel limiting groove 38 recessed downward. One end of the moving frame 18 is provided with a second moving arm 19 extending to the top of the base plate 1, and the second moving arm 19 is movably connected to the base plate 1. At the upper end of the second moving arm 19, there is a foot restraint plate 17. On the side of the foot restraint plate 17 facing the limiting plate 3, there is a flexible or elastic pad structure, which can not only avoid discomfort or damage to the user caused by hard contact, but also increase the adaptability. One end of the moving frame 18 away from the second moving arm 19 is provided with a first moving arm 8 extending to the top of the base plate 1. The first moving arm 8 is a hollow structure, and the first moving arm 8 is movably connected to the base plate 1. On one side of the first moving arm 8, there is a knee restraint plate 16. At the bottom of the knee restraint plate 16, there is a flexible or elastic pad structure, which can avoid discomfort or damage to the user caused by hard contact. In order to adapt to different users and the upward-bent knees of the user at the initial stage, a height adjustment component for adjusting the height of the knee restraint plate 16 is arranged on the first moving arm 8. The height adjustment component includes a lifting seat 29 vertically and movably connected to the inner side of the first moving arm 8. Specifically, a vertical guide rod is arranged on the inner side of the first moving arm 8, and one end of the lifting seat 29 is movably sleeved outside the guide rod. One end of the knee restraint plate 16 is fixed to one side of the lifting seat 29. A locking tooth 32 is movably connected to the inner side of the side wall of the lifting seat 29. A fourth elastic member 33 is arranged between the locking tooth 32 and the inner side of the side wall of the lifting seat 29. The fourth elastic member 33 is preferably a spring. At one end of the inner side of the first moving arm 8, there is a locking plate 30. On one side of the locking plate 30, locking grooves 34 adapted to the locking teeth 32 are uniformly arranged along the height direction. The locking teeth 32 are inclined upward, and the locking teeth 32 are engaged with the locking grooves 34. A second elastic member 28 is arranged between the bottom of the lifting seat 29 and the inner bottom of the first moving arm 8. The second elastic member 28 is preferably a spring, and the spring is sleeved outside the guide rod. Initially, the knee restraint plate 16 is located at the highest point and can be higher than the user's knees after the user sits down. In order to make the knee restraint plate 16 and the foot restraint plate 17 in place, a driving component for driving the displacement of the moving frame 18 is arranged in the inner cavity of the installation groove 9. The driving component includes a rotating rod 11 rotatably arranged at one end of the inner cavity of the installation groove 9. At the bottom of the traction plate 13, there is a driving cylinder 10 corresponding to the rotating rod 11. One end of the rotating rod 11 is movably connected to the inner side of the driving cylinder 10. On the outer wall of one end of the rotating rod 11, there is a spiral first guide groove 24. On the inner wall of one end of the driving cylinder 10, there is a guide block 36 that is movably and guidingly engaged with the first guide groove 24.On the outer wall of one end of the rotating rod 11 close to the driving cylinder 10, a second guide groove 25 that communicates with the first guide groove 24 and has a smooth inner wall transition is provided. The second guide groove 25 is parallel to the axis of the rotating rod 11. The second guide groove 25 will not be displaced due to the continuous displacement of the seat cushion 2 after the knee restraint plate 16 and the foot restraint plate 17 are in place. At one end of the bottom of the moving frame 18, a rack 15 is provided, and at one end of the rotating rod 11, a gear 23 that meshes with the rack 15 is provided.,

[0022] In addition, as Figures 7 - 10 shown, in order to further increase adaptability, a horizontal adjustment component is provided between the knee restraint plate 16 and the lifting seat 29. The horizontal adjustment component includes an adjustment frame 27 provided on one side of the lifting seat 29. On one side of the adjustment frame 27, an adjustment screw rod 35 is rotatably provided. One end of the adjustment screw rod 35 is provided with a knob. One end of the knee restraint plate 16 is threadedly connected to the adjustment screw rod 35, and a guide rod is provided on one side of the adjustment frame 27. In order to increase the stability of the knee restraint plate 16, one end of the knee restraint plate 16 is movably sleeved outside the guide rod.

[0023] As Figures 2 - 5 、 Figures 7 - 12As shown, in order to facilitate the upward reset of the knee restraint plate 16 after training, the locking plate 30 is horizontally movably connected to the inner end of the first moving arm 8. A third elastic member 31 is provided between one side of the locking plate 30 and the inner end of the first moving arm 8. The third elastic member 31 is preferably a spring. An unlocking assembly is provided at one end of the installation groove 9. The unlocking assembly includes a push arm 26 provided on one side of the lower end of the locking plate 30, and one end of the push arm 26 extends to the outside of the first moving arm 8. The push arm 26 is movably connected to the first moving arm 8. A fixing plate 22 is fixed at one end of the inner cavity of the installation groove 9 close to the limiting plate 3. An unlocking plate 21 is movably provided on the side of the fixing plate 22 close to the limiting plate 3. A fifth elastic member 37 is provided between the unlocking plate 21 and the fixing plate 22. The fifth elastic member 37 is preferably a spring. To increase stability, a guide rod is provided on one side of the fixing plate 22. The unlocking plate 21 is movably sleeved outside the guide rod. At the same time, the fifth elastic member 37 is also sleeved outside the guide rod. The end of the unlocking plate 21 corresponds to the push arm 26 and is used to push the push arm 26 to displace. To reduce the friction between the unlocking plate 21 and the push arm 26 when the first moving arm 8 is reset, a roller 20 for rolling cooperation with the side wall of the unlocking plate 21 is rotatably provided at one end of the push arm 26 close to the unlocking plate 21. A force-bearing arm 14 extending to the top of the base plate 1 is provided on the side of the unlocking plate 21 close to the training arm 4. The force-bearing arm 14 is movably connected to the base plate 1, and the upper end of the force-bearing arm 14 corresponds to the lower end of the training arm 4. Specifically, the upper end of the force-bearing arm 14 extends into one end of the linear guide corresponding to the training arm 4. When the lower end of the training arm 4 reaches the end of the linear guide, it can push the force-bearing arm 14. Specifically, when the training arm 4 is pulled excessively towards the user's own direction, the training arm 4 can push the force-bearing arm 14, so that the force-bearing arm 14 can push the unlocking plate 21.

[0024] When in use, the user sits on the seat cushion 2, places the feet on the footboard 5, pushes the side wall of the limiting plate 3 with the feet, and places the heel part in the heel limiting groove 38 as much as possible. At this time, the knees are bent, and the feet push the limiting plate 3 with force, the seat cushion 2 moves, and the seat cushion 2 drives the traction plate 13 to move, the first elastic member 12 is compressed, and the traction plate 13 drives the driving cylinder 10 to move, and the guide block 36 in the driving cylinder 10 moves in the first guide groove 24, so that the rotating rod 11 is driven to rotate, and the rotating rod 11 drives the gear 23 to rotate, and the gear 23 drives the moving frame 18 to move through the rack 15, and the moving frames 18 on both sides move closer to the middle, and the moving frame 18 drives the second moving arm 19 and the first moving arm 8 to move synchronously, and the second moving arm 19 and the first moving arm 8 to move synchronously. The arm 19 drives the foot restraint plate 17 to move toward the front of the foot. As the seat cushion 2 moves, the knee gradually drops and the leg gradually tends to be horizontal. The first movable arm 8 drives the knee restraint plate 16 to move above the leg. Then, the seat cushion 2 continues to move and the guide block 36 enters the second guide groove 25 from the first guide groove 24. At this time, the seat cushion 2 continues to move and the rotating rod 11 does not rotate. The foot restraint plate 17 and the first movable arm 8 remain stationary. Then, the adjusting screw 35 is screwed as needed to drive the knee restraint plate 16 to be adjusted horizontally to above the knee, and the knee restraint plate 16 is pressed downward. The knee restraint plate 16 drives the lifting seat 29 to move downward through the adjusting frame 27, and the second elastic member 28 contracts. At the same time, the locking tooth 32 follows the lifting seat 29 to move downward, so that the fourth elastic member 28 is The locking tooth 32 is disengaged from the locking groove 34 until the knee restraint plate 16 presses the knee tightly, and the locking tooth 32 is stuck in the corresponding locking groove 34, so that the knee restraint plate 16 cannot rise, and the foot restraint plate 17 limits the front side of the foot, thereby realizing the double restraint of the foot and the knee. Then, the training handle 7 is held by both hands to push the training arm 4 back and forth for training. At the same time, the user can also straighten the palm, push the middle finger against the cursor 6 and push forward to perform the sit-up forward flexion test. After the end, the user holds the training handle 7 and pulls the training arm 4 toward himself. The lower end of the training arm 4 will contact one end of the force-bearing arm 14, and then the unlocking plate 21 is pushed to move through the force-bearing arm 14. The fifth elastic member 37 contracts, and the unlocking plate 21 passes The roller 20 pushes the push arm 26, and the push arm 26 pushes the locking plate 30. The locking plate 30 is displaced and compresses the third elastic member 31. The locking groove 34 on one side of the locking plate 30 is separated and staggered from the locking tooth 32, and then the second elastic member 28 is reset, the lifting seat 29, the adjustment frame 27, and the knee restraint plate 16 rise and reset, and then the buttocks drive the seat cushion 2 to approach the limit plate 3, the traction plate 13 drives the driving cylinder 10 to reset, the guide block 36 enters the first guide groove 24 from the second guide groove 25, the rotating rod 11 drives the gear 23 to reverse, the rack 15 drives the moving frame 18 to reset, the foot restraint plate 17 and the first moving arm 8 gradually move to both sides, and the knees bend upward. When the foot restraint plate 17 and the knee restraint plate 16 are bent and moved away, the user can get up and leave; It should be noted that, in order to achieve the staggered separation of the locking plate 30 and the locking tooth 32 after the training is completed, the pulling distance of the training arm 4 is farther than the pulling distance during training. During training, the lower end of the training arm 4 will not contact the force-bearing arm 14. Therefore, the knee restraint plate 16 will not be separated from the knee during training. Only when the training is completed and the training arm 4 is pulled excessively toward its own position will it contact one end of the force-bearing arm 14.

[0025] The technical scope of the present invention is not limited to the contents in the above description. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of ​​the present invention, and these deformations and modifications should all fall within the protection scope of the present invention.

Claims

1. A sitting forward bend restraint exercise device for physical training, characterized in that: It includes a substrate and a limiting plate provided at one end of the substrate; A training arm is movably provided at one end of the substrate close to the limiting plate, and a training handle is provided at one end of the training arm close to the limiting plate; A seat cushion is movably provided at one end of the substrate away from the limiting plate. An installation groove is provided at the bottom of the substrate. One end of the bottom of the seat cushion is provided with a traction plate extending into the inner side of the installation groove. A first elastic member is provided between the side of the traction plate away from the limiting plate and one end of the inner cavity of the installation groove away from the limiting plate; It further includes a restraint assembly. The restraint assembly includes moving frames movably provided on both sides of the inner cavity of the installation groove close to one end of the limiting plate. One end of the moving frame is provided with a second moving arm extending to the top of the substrate. A foot restraint plate is provided at the upper end of the second moving arm. One end of the moving frame away from the second moving arm is provided with a first moving arm extending to the top of the substrate. A knee restraint plate is provided on one side of the first moving arm; A driving assembly for driving the displacement of the moving frame is provided in the inner cavity of the installation groove. The driving assembly includes a rotating rod rotatably provided at one end of the inner cavity of the installation groove. A driving cylinder corresponding to the rotating rod is fixed at the bottom of the traction plate. One end of the rotating rod is movably connected to the inner side of the driving cylinder. A spiral first guide groove is provided on the outer wall of one end of the rotating rod. A guide block is provided on the inner wall of one end of the driving cylinder and is in movable guiding cooperation with the first guide groove. A rack is provided at one end of the bottom of the moving frame. A gear meshing with the rack is provided at one end of the rotating rod.

2. The sit-and-reach restraint exercise device for physical training according to claim 1, characterized in that: A foot plate having the same height as the seat cushion is provided at the lower end of the side of the limiting plate close to the seat cushion. A heel limiting groove is provided in a downward concave manner at one end of the foot plate close to the limiting plate.

3. A sitting forward bend restraint exercise device for physical training according to claim 1, characterized in that: A height adjustment assembly for adjusting the height of the knee restraint plate is provided on the first moving arm. The height adjustment assembly includes a lifting seat vertically and movably connected to the inner side of the first moving arm. One end of the knee restraint plate is fixed to one side of the lifting seat. A locking tooth is movably connected to the inner side of the side wall of the lifting seat. A fourth elastic member is provided between the locking tooth and the inner side of the side wall of the lifting seat. A locking plate is provided at one end of the inner side of the first moving arm. Locking grooves adapted to the locking teeth are uniformly provided along the height direction on one side of the locking plate. The locking tooth is inclined upward, and the locking tooth is in clamping cooperation with the locking groove. A second elastic member is provided between the bottom of the lifting seat and the inner bottom of the first moving arm.

4. A sitting forward bend restraint exercise device for physical training according to claim 3, characterized in that: A horizontal adjustment assembly is provided between the knee restraint plate and the lifting seat. The horizontal adjustment assembly includes an adjustment frame provided on one side of the lifting seat. An adjustment screw rod is rotatably provided on one side of the adjustment frame. One end of the knee restraint plate is threadedly connected to the adjustment screw rod.

5. A sitting forward bend restraint exercise device for physical training according to claim 1, characterized in that: A second guide groove communicating with the first guide groove and having a smooth inner wall transition is provided on the outer wall of one end of the rotating rod close to the driving cylinder. The second guide groove is parallel to the axis of the rotating rod.

6. A sit-and-reach restraint exercise device for physical training according to claim 3, characterized in that: The locking plate is horizontally movably connected to one end of the inner side of the first moving arm. A third elastic member is provided between one side of the locking plate and one end of the inner side of the first moving arm; One end of the installation groove is provided with an unlocking component. The unlocking component includes a push arm arranged on one side of the lower end of the locking plate, and one end of the push arm extends to the outside of the first moving arm. A fixed plate is fixed at one end of the inner cavity of the installation groove close to the limiting plate. An unlocking plate is movably arranged on the side of the fixed plate close to the limiting plate. A fifth elastic member is arranged between the unlocking plate and the fixed plate. The end of the unlocking plate corresponds to the push arm and is used to push the push arm to displace. A force-bearing arm extending to the top of the substrate is arranged on the side of the unlocking plate close to the training arm, and the upper end of the force-bearing arm corresponds to the lower end of the training arm.

7. A sit-and-reach restraint exercise device for physical training according to claim 6, characterized in that: A roller for rolling cooperation with the side wall of the unlocking plate is rotatably arranged at one end of the push arm close to the unlocking plate.

8. A sit-and-reach restraint exercise device for physical training according to claim 1, characterized in that: A cursor is movably connected to the upper end of the training arm, and a scale corresponding to the cursor is arranged at the upper end of the training arm.

9. The sit-and-reach restraint exercise device for physical training according to claim 1, characterized in that: Flexible or elastic pads are arranged on the bottom of the knee restraint plate and on the side of the foot restraint plate facing the limiting plate.

10. A sitting forward bend restraint exercise device for physical training according to claim 1, characterized in that: A protruding lumbar stopper is arranged at one end of the top of the seat cushion away from the limiting plate.

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