阅读说明：本技术 一种自由泳陆地训练器及游泳训练系统 (Free-swimming land trainer and swimming training system ) 是由 陈敏 姚绩伟 于 2021-08-25 设计创作，主要内容包括：本发明涉及游泳训练装置技术领域,公开了一种自由泳陆地训练器及游泳训练系统,包括：机架、盛水桶、夹头环、提示器和处理器,机架上依次设置有上肢训练机构、用于人体俯卧的承重机构以及下肢训练机构,盛水桶固定于上肢训练机构和承重机构之间,盛水桶内承载有水,夹头环通过连接柱连接于盛水桶的内壁上,夹头环的内侧设置有多个脑电波采集电极,脑电波采集电极用于采集大脑的生理反应信号数据,提示器设置于机架上,用于根据脑生理反应信号数据发出提示音,处理器将脑电波采集电极采集的生理反应信号数据与数据库中的指标数据进行比较,并根据比较结果控制提示器发出提示音,本发明可以将呼吸气训练与四肢训练结合起来达到最佳的训练效果。(The invention relates to the technical field of swimming training devices, and discloses a free swimming land trainer and a swimming training system, which comprise: the device comprises a rack, a water containing barrel, a chuck ring, a prompter and a processor, wherein an upper limb training mechanism, a bearing mechanism for human body lying on stomach and a lower limb training mechanism are sequentially arranged on the rack, the water containing barrel is fixed between the upper limb training mechanism and the bearing mechanism, water is loaded in the water containing barrel, the chuck ring is connected to the inner wall of the water containing barrel through a connecting column, a plurality of brain wave acquisition electrodes are arranged on the inner side of the chuck ring and used for acquiring physiological reaction signal data of the brain, the prompter is arranged on the rack, used for sending out prompt sound according to the brain physiological response signal data, the processor compares the physiological response signal data collected by the brain wave collecting electrode with index data in a database, and the prompting device is controlled to give out prompting sound according to the comparison result, so that the breathing training and the limb training can be combined to achieve the optimal training effect.)

1. The utility model provides a free swimming land training ware, includes frame (1), set gradually upper limbs training mechanism (2), be used for bearing mechanism (3) and lower limbs training mechanism (4) of human prostration in frame (1), its characterized in that still includes:

the water containing barrel (5) is fixed between the upper limb training mechanism (2) and the bearing mechanism (3), and water is loaded in the water containing barrel (5);

the clamp ring (6) is connected to the inner wall of the water containing barrel (5) through a connecting column (7), a plurality of brain wave acquisition electrodes (8) are arranged on the inner side of the clamp ring (6), and the brain wave acquisition electrodes (8) are used for acquiring physiological response signal data of the brain;

the prompter (9) is arranged on the rack (1) and is used for sending out prompting sound according to the brain physiological response signal data;

and the processor compares the physiological response signal data acquired by the brain wave acquisition electrode (8) with index data in a database and controls the prompter (9) to give out a prompt sound according to a comparison result.

2. The freestyle land trainer according to claim 1, wherein a fixed sleeve (12) is fixed at the lower end of the water tub (5), the fixed sleeve (12) is fixedly connected with the frame (1), a piston mechanism (10) is further arranged in the water tub (5), and the piston mechanism (10) is used for adjusting the water level in the water tub (5) according to the physiological response signal data.

3. Freestyle land trainer according to claim 2, wherein the piston mechanism (10) comprises:

a piston head (100) slidably engaged with an inner wall of the tub (5) in a vertical direction;

the piston rod (101) is fixed at the lower end of the piston head (100), the piston rod (101) penetrates through a through hole (102) in the bottom of the water tub (5), and a sealing ring (103) is fixed in the through hole (102);

the vertical moving mechanism (11) is arranged in the fixed sleeve (12), the lower end of the vertical moving mechanism (11) is connected with the rack (1), and the upper end of the vertical moving mechanism is connected with the piston rod (101), so that the piston rod (101) can move up and down along the vertical direction.

4. Freestyle land trainer according to claim 3, wherein the vertical movement mechanism (11) comprises:

the outer diameter of the moving rod (110) is equal to that of the piston rod (101), a cavity (111) is formed in the moving rod (110), and racks (115) are fixed on the inner walls of the two sides of the moving rod (110) along the longitudinal direction of the moving rod;

the two gears (112) are respectively connected with a gear shaft (113), the rear side surface of the moving rod (110) is provided with a sliding groove, the gear shaft (113) penetrates through the sliding groove to extend out of the moving rod (110), the two gears (112) are mutually meshed, and the gears (112) are correspondingly meshed with the racks (115) one by one;

the first motor is arranged in the fixed sleeve (12), and an output shaft of the first motor is connected with one gear shaft (113) in a shaft mode;

and the guide sleeve (114) is fixed in the fixed sleeve (12), and the guide sleeve (114) is sleeved on the periphery of the moving rod (110).

5. The freestyle land trainer according to claim 1, wherein a second motor (13) is provided in the wall of the tub (5), the output shaft of the second motor (13) being connected to the connection column (7).

6. Freestyle land trainer according to claim 1 or 5, wherein the grip ring (6) comprises:

the first half ring (600) is provided with the brain wave collecting electrode (8) on the side surface which is bent inwards;

the second half ring (601), the side surface bending inwards is provided with the brain wave collecting electrode (8);

and a displacement mechanism (61) connected to the first half ring (600) and the second half ring (601), respectively, so as to move the first half ring (600) and the second half ring (601) closer to each other or away from each other.

7. The freestyle land trainer according to claim 6, wherein the displacement mechanism (61) comprises:

the accommodating cylinder (610) is hollow and is vertically fixedly connected to the front end of the connecting column (7), a through groove (611) is formed in the front end face of the accommodating cylinder (610), and the through groove (611) is arranged along the longitudinal direction of the accommodating cylinder (610) and penetrates through the front end face of the accommodating cylinder (610);

a first screw (612) disposed along an axis of the receiving cylinder (610), a first end of the first screw (612) being connected to a left side wall of the receiving cylinder (610);

a second screw (613) disposed along an axis of the receiving cylinder (610), a first end of the second screw (613) being connected to a second end of the first screw (612), the second screw (613) being threaded in a direction opposite to that of the first screw (612);

the nut (614) is respectively screwed on the peripheries of the first screw rod (612) and the second screw rod (613), the nut (614) is in sliding fit with the inner wall of the accommodating cylinder (610), and the first half ring (600) and the second half ring (601) are correspondingly connected to the nut (614) one by one;

and a third motor (615) fixed in the accommodating cylinder (610), wherein an output shaft of the third motor (615) is connected with a second end of the second screw rod (613).

8. The freestyle land trainer according to claim 7, wherein the nut (614) is connected to the first half-ring (600) and the second half-ring (601) by a connecting member (616).

9. The freestyle land trainer according to claim 6, wherein the first half-ring (600) has a locking block (602) fixed to the opposite side wall of the second half-ring (601), the opposite side wall of the second half-ring (601) to the first half-ring (600) has a locking groove (603), and the locking groove (603) is engaged with the locking block (602).

10. A swimming training system comprising the freestyle land trainer of any of claims 1 or 4 or 9.

Technical Field

The invention relates to the technical field of swimming training devices, in particular to a free swimming land trainer and a swimming training system.

Background

Free swimming is strictly not a swimming gesture, but a competition item for competitive swimming, the competition rule of the free swimming is almost without any limit on the swimming gesture, and the crawling swimming gesture has the advantages of reasonable structure, small resistance, uniform and quick speed, and is a swimming gesture which is most labor-saving and fastest. Therefore, people often use the swimming stroke with small resistance and high speed in the swimming game item with almost no restriction on the swimming stroke, so that the free swimming stroke and the creeping stroke are generally treated at present.

A number of free-swimming land trainers have been developed to train the main moving parts of the swimmer, such as the arms and legs, through various mechanical structures, and to combine the stroke with the cooperation of the arms and legs to train the swim posture and physical performance of the swimmer.

However, for swimming, the most important basic function is to adjust the breathing, the matching of breathing and breathing often determines the speed of free swimming, and the conventional free swimming land trainer cannot achieve the training purpose, so that athletes cannot train the breathing rhythm during land training, and cannot coordinate the breathing rhythm with the four limbs of the body to train, and the training effect is poor.

Disclosure of Invention

The invention provides a free swimming land trainer and a swimming training system, which can combine respiratory gas training and limb training to achieve the best training effect.

The invention provides a free swimming land trainer, which comprises:

the upper limb training mechanism, the bearing mechanism for the prone position of the human body and the lower limb training mechanism are sequentially arranged on the rack;

the water containing barrel is fixed between the upper limb training mechanism and the bearing mechanism and is loaded with water;

the clamp ring is connected to the inner wall of the water containing barrel through a connecting column, a plurality of brain wave acquisition electrodes are arranged on the inner side of the clamp ring, and the brain wave acquisition electrodes are used for acquiring physiological response signal data of the brain;

the prompter is arranged on the frame and used for sending out prompting sound according to the brain physiological response signal data;

and the processor compares the physiological response signal data acquired by the brain wave acquisition electrode with index data in the database and controls the prompter to give out prompt tone according to the comparison result.

Optionally, a fixing sleeve is fixed at the lower end of the water containing barrel, the fixing sleeve is fixedly connected with the rack, a piston mechanism is further arranged in the water containing barrel, and the piston mechanism is used for adjusting the water level height in the water containing barrel according to the physiological response signal data.

Optionally, the piston mechanism comprises:

the piston head is in sliding fit with the inner wall of the water containing barrel along the vertical direction;

the piston rod is fixed at the lower end of the piston head, penetrates through a through hole in the bottom of the water containing barrel, and is internally fixed with a sealing ring;

and the vertical moving mechanism is arranged in the fixed sleeve, the lower end of the vertical moving mechanism is connected with the rack, and the upper end of the vertical moving mechanism is connected with the piston rod, so that the piston rod can move up and down along the vertical direction.

Optionally, the vertical moving mechanism comprises:

the moving rod is equal to the outer diameter of the piston rod, a cavity is formed inside the moving rod, and racks are respectively fixed on the inner walls of the two sides of the moving rod along the longitudinal direction of the moving rod;

the two gears are respectively connected with a gear shaft, the rear side surface of the movable rod is provided with a sliding groove, the gear shaft penetrates through the sliding groove to extend out of the movable rod, the two gears are mutually meshed, and the gears and the racks are correspondingly meshed one by one;

the first motor is arranged in the fixed sleeve, and an output shaft of the first motor is connected with a gear shaft;

and the guide sleeve is fixed in the fixed sleeve and is sleeved on the periphery of the moving rod.

Optionally, a second motor is arranged in the wall of the water containing barrel, and an output shaft of the second motor is connected with the connecting column.

Optionally, the collet ring comprises:

the first half ring is provided with brain wave collecting electrodes on the side surface which is bent inwards;

the second half ring is provided with brain wave collecting electrodes on the side surface which is bent inwards;

and the displacement mechanism is respectively connected with the first half ring and the second half ring so as to enable the first half ring and the second half ring to approach or separate from each other.

Optionally, the displacement mechanism comprises:

the accommodating cylinder is hollow and is vertically and fixedly connected to the front end of the connecting column, and the front end face of the accommodating cylinder is provided with a through groove which is arranged along the longitudinal direction of the accommodating cylinder and penetrates through the front end face of the accommodating cylinder;

the first screw rod is arranged along the axis of the accommodating cylinder, and the first end of the first screw rod is connected with the left side wall of the accommodating cylinder;

the second screw rod is arranged along the axis of the accommodating cylinder, the first end of the second screw rod is connected with the second end of the first screw rod, and the thread directions of the second screw rod and the first screw rod are opposite;

the nut is respectively screwed on the peripheries of the first screw rod and the second screw rod, the nut is in sliding fit with the inner wall of the accommodating cylinder, and the first half rings and the second half rings are connected to the nut in a one-to-one correspondence manner;

and the third motor is fixed in the accommodating barrel, and an output shaft of the third motor is connected with the second end of the second screw rod.

Optionally, the nut is connected with the first half ring and the second half ring through a connecting piece.

Optionally, a clamping block is fixed on the opposite side wall of the first half ring and the second half ring, a clamping groove is formed on the opposite side wall of the second half ring and the first half ring, and the clamping groove is matched with the clamping block.

The invention also provides a swimming training system, which comprises the free swimming land trainer.

Compared with the prior art, the invention has the beneficial effects that: the invention arranges the water holding barrel between the upper limb training mechanism and the bearing mechanism for the prone position of the human body, so that when the athlete trains the four limbs, the head can be put into the water containing barrel and submerged, the clamping head ring is worn on the head, physiological response signal data of the brain of the athlete can be acquired through the brain wave acquisition electrodes on the clamping head ring, the air sucked in gradually becomes less along with the lapse of time, the athlete can gradually lack oxygen, the physiological response signal data is compared with the data in the database according to the acquired physiological response signal data, if the data that the athlete approaches the limit is judged to be reached, an alarm sound is sent by the prompter to remind the athlete to ventilate, just so can maximum supplementary sportsman train the rhythm of respiratory gas and cooperate with the four limbs training to coordinate good four limbs training under the rhythm of efficient respiratory gas, guarantee the training effect.

Drawings

Fig. 1 is a schematic structural diagram of a free-swimming land trainer according to an embodiment of the invention;

FIG. 2 is an enlarged view of a portion of the structure at G in FIG. 1;

FIG. 3 is a schematic structural diagram of a collet ring according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a displacement mechanism provided in accordance with an embodiment of the present invention;

fig. 5 is an enlarged view of a portion of the structure at H in fig. 3.

Description of reference numerals:

1-a frame, 2-an upper limb training mechanism, 3-a bearing mechanism, 4-a lower limb training mechanism, 5-a water barrel, 6-a chuck ring, 600-a first half ring, 601-a second half ring, 602-a clamping block, 603-a clamping groove, 61-a displacement mechanism, 610-a containing cylinder, 611-a through groove, 612-a first screw rod, 613-a second screw rod, 614-a nut, 615-a third motor, 616-a connecting piece, 7-a connecting column, 8-a brain wave collecting electrode, 9-a prompter, 10-a piston mechanism, 100-a piston head, 101-a piston rod, 102-a perforation, 103-a sealing ring, 11-a vertical moving mechanism, 110-a moving rod, 111-a cavity, 112-a gear and 113-a gear shaft, 114-guide sleeve, 115-rack, 12-fixing sleeve, 13-second motor.

Detailed Description

An embodiment of the present invention will be described in detail below with reference to the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the embodiment.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing technical solutions of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Free swimming is strictly not a swimming gesture, but a competition item for competitive swimming, the competition rule of the free swimming is almost without any limit on the swimming gesture, and the crawling swimming gesture has the advantages of reasonable structure, small resistance, uniform and quick speed, and is a swimming gesture which is most labor-saving and fastest. Therefore, people often use the swimming stroke with small resistance and high speed in the swimming game item with almost no restriction on the swimming stroke, so that the free swimming stroke and the creeping stroke are generally treated at present.

A number of free-swimming land trainers have been developed to train the main moving parts of the swimmer, such as the arms and legs, through various mechanical structures, and to combine the stroke with the cooperation of the arms and legs to train the swim posture and physical performance of the swimmer.

However, for swimming, the most important basic function is to adjust the breathing, the matching of breathing and breathing often determines the speed of free swimming, and the conventional free swimming land trainer cannot achieve the training purpose, so that athletes cannot train the breathing rhythm during land training, and cannot coordinate the breathing rhythm with the four limbs of the body to train, and the training effect is poor.

Based on the above problems, the present invention provides a free-swimming land trainer and a swimming training system, which can combine respiratory gas training and limb training to achieve the best training effect, and the following detailed description will be provided with reference to the accompanying drawings, wherein fig. 1 is a schematic structural diagram of a free-swimming land trainer provided in an embodiment of the present invention, fig. 2 is an enlarged schematic diagram of a partial structure at G in fig. 1, fig. 3 is a schematic structural diagram of a clip ring provided in an embodiment of the present invention, fig. 4 is a schematic structural diagram of a displacement mechanism provided in an embodiment of the present invention, and fig. 5 is an enlarged schematic diagram of a partial structure at H in fig. 3.

As shown in fig. 1 to 3, an embodiment of the present invention provides a freestyle land trainer, including: the device comprises a frame 1, a water containing barrel 5, a chuck ring 6, a prompter 9 and a processor, wherein an upper limb training mechanism 2, a bearing mechanism 3 for a prone position of a human body and a lower limb training mechanism 4 are sequentially arranged on the frame 1, the water containing barrel 5 is fixed between the upper limb training mechanism 2 and the bearing mechanism 3, water is loaded in the water containing barrel 5, the chuck ring 6 is connected to the inner wall of the water containing barrel 5 through a connecting column 7, a plurality of brain wave acquisition electrodes 8 are arranged on the inner side of the chuck ring 6, the brain wave acquisition electrodes 8 are used for acquiring physiological reaction signal data of the brain, the prompter 9 is arranged on the frame 1 and is used for sending out a prompt sound according to the brain physiological reaction signal data, the processor compares the physiological reaction signal data acquired by the brain wave acquisition electrodes 8 with index data in a database and controls the prompter 9 to send out the prompt sound according to a comparison result, the clamping head ring 6 and the brain wave acquisition electrode 8 are made of waterproof materials, index data in the database can obtain brain physiological response signal data when the breath-closed limit of most athletes can be reached according to a large amount of acquired data, different breath-closed grades can be set in the database, the athletes can select different grades according to self conditions, and the rhythm of the respiratory gas can be trained in a progressive mode.

The invention arranges the water holding barrel between the upper limb training mechanism and the bearing mechanism for the prone position of the human body, so that when the athlete trains the four limbs, the head can be put into the water containing barrel and submerged, the clamping head ring is worn on the head, physiological response signal data of the brain of the athlete can be acquired through the brain wave acquisition electrodes on the clamping head ring, the air sucked in gradually becomes less along with the lapse of time, the athlete can gradually lack oxygen, the physiological response signal data is compared with the data in the database according to the acquired physiological response signal data, if the data that the athlete approaches the limit is judged to be reached, an alarm sound is sent by the prompter to remind the athlete to ventilate, just so can maximum supplementary sportsman train the rhythm of respiratory gas and cooperate with the four limbs training to coordinate good four limbs training under the rhythm of efficient respiratory gas, guarantee the training effect.

In order to avoid that the athlete cannot timely swing the head for ventilation because the athlete does not notice the prompt sound or the response delay sent by the prompter 9, in the embodiment, the lower end of the water bucket 5 is fixed with a fixed sleeve 12, the fixed sleeve 12 is fixedly connected with the frame 1, a piston mechanism 10 is also arranged in the water bucket 5, the piston mechanism 10 is used for adjusting the water level height in the water bucket 5 according to the physiological response signal data, when the processor judges that the athlete reaches the limit of the closed ventilation at the moment, the piston mechanism 10 is controlled to move while the prompter 9 is controlled to send the prompt sound, the piston mechanism 10 is driven to move downwards to drive the water level to move downwards for a fixed distance so as to enable the face of the athlete to be separated from the water surface for ventilation in time, and when the processor judges that the physiological response signal data of the athlete reaches the normal level, the piston mechanism 10 is controlled to move upwards to enable the water level to rise to the original position while the prompt sound sent by the prompter 9 is controlled, in this embodiment, the prompting sound sent by the indicator 9 may be different, one is to prompt ventilation, and the other is to prompt air closure.

Referring again to fig. 2, the piston mechanism 10 includes: the water-holding bucket comprises a piston head 100, a piston rod 101 and a vertical moving mechanism 11, wherein the piston head 100 is in sliding fit with the inner wall of the water holding bucket 5 along the vertical direction, the piston rod 101 is fixed at the lower end of the piston head 100, the piston rod 101 penetrates through a through hole 102 in the bottom of the water holding bucket 5, a sealing ring 103 is fixed in the through hole 102, the vertical moving mechanism 11 is arranged in a fixed sleeve 12, the lower end of the vertical moving mechanism 11 is connected with the rack 1, and the upper end of the vertical moving mechanism is connected with the piston rod 101 so that the piston rod 101 can move up and down along the vertical direction.

Alternatively, the vertical movement mechanism 11 includes: the movable rod 110, two gears 112, a first motor and a guide sleeve 114, the movable rod 110 is equal to the outer diameter of the piston rod 101, a cavity 111 is formed in the movable rod 110, racks 115 are respectively fixed on the inner walls of two sides of the movable rod 110 along the longitudinal direction of the movable rod, the two gears 112 are respectively connected with a gear shaft 113, a sliding groove is formed in the rear side surface of the movable rod 110, the gear shaft 113 penetrates through the sliding groove to extend out of the movable rod 110, the two gears 112 are mutually meshed, the gears 112 are meshed with the racks 115 in a one-to-one correspondence manner, the first motor is arranged in the fixed sleeve 12, an output shaft of the first motor is connected with a gear shaft 113, the guide sleeve 114 is fixed in the fixed sleeve 12, and the guide sleeve 114 is sleeved on the periphery of the movable rod 110.

When the processor judges that the athlete reaches the limit of the air-lock at the moment, the processor controls the first motor to rotate to drive one gear 112 to rotate, the gear 112 drives the other gear 112 meshed with the gear to rotate reversely, so that the two gears 112 respectively drive the racks 115 meshed with the two gears to move downwards along the guide sleeve 114 to drive the piston rod 101 to move downwards, the piston head 100 moves downwards to move the water level, when the processor judges that the physiological response signal data of the athlete reaches a normal level, the processor controls the prompting sound sent by the prompter 9 and controls the first motor to rotate reversely to drive one gear 112 to rotate reversely, the gear 112 drives the other gear 112 meshed with the gear to rotate reversely, so that the two gears 112 respectively drive the racks 115 meshed with the two gears to move upwards along the guide sleeve 114 to drive the piston rod 101 to move upwards, and the piston head 100 moves upwards to move the water level to the initial position, the cooperation of the two gears 112 and the two racks 115 ensures stable up and down movement of the piston rod 101, and further ensures that the piston head 100 does not deflect when moving vertically up and down, further ensuring stable water level in the tub 5.

In order to further assist the athlete to perform timely ventilation training and adjust the rhythm of the breathing air, in the embodiment, a second motor 13 is arranged in the wall of the water containing barrel 5, an output shaft of the second motor 13 is connected with the connecting column 7, when the processor judges that the athlete reaches the limit of air-lock at the moment, the second motor 13 is controlled to rotate by a certain angle towards the left side or the right side, the head part of the athlete simulates the action of ventilation when swimming in a swimming pool to rotate so that the nose is separated from the water surface for ventilation, and when the processor judges that the physiological reaction signal data of the athlete reaches the normal level, the second motor 13 is controlled to rotate by a certain angle so that the head part of the athlete is positioned in the water to perform air-lock training.

Some athletes may not need to resort to the collet ring 6 or need to adjust the grip tightness of the collet ring 6, with reference to fig. 3, the collet ring 6 comprises: the brain wave collecting device comprises a first half ring 600, a second half ring 601 and a displacement mechanism 61, wherein the side surface of the first half ring 600 which is bent inwards is provided with a brain wave collecting electrode 8, the side surface of the second half ring 601 which is bent inwards is provided with a brain wave collecting electrode 8, and the displacement mechanism 61 is respectively connected with the first half ring 600 and the second half ring 601 so as to enable the first half ring 600 and the second half ring 601 to approach to each other or separate from each other.

Prior to training, the athlete adjusts the relative displacement between the first half 600 and the second half 601 via the displacement mechanism 61.

Referring to fig. 4, the displacement mechanism 61 includes: the accommodating cylinder 610 is hollow and is vertically and fixedly connected to the front end of the connecting column 7, the front end surface of the accommodating cylinder 610 is provided with a through groove 611, the through groove 611 is arranged along the longitudinal direction of the accommodating cylinder 610 and penetrates through the front end surface of the accommodating cylinder 610, the first screw 612 is arranged along the axis of the accommodating cylinder 610, the first end of the first screw 612 is connected with the left side wall of the accommodating cylinder 610, the second screw 613 is arranged along the axis of the accommodating cylinder 610, the first end of the second screw 613 is connected with the second end of the first screw 612, the thread directions of the second screw 613 and the first screw 612 are opposite, the nut 614 is respectively screwed on the peripheries of the first screw 612 and the second screw 613, the nut 614 is in sliding fit with the inner wall of the accommodating cylinder 610, the first half rings 600 and the second half rings 601 are correspondingly connected to the nut one by one, the third motor 615 is fixed in the accommodating cylinder 610, an output shaft of the third motor 615 is connected to a second end of the second screw 613.

The third motor 615 drives the first screw 612 and the second screw 61 to rotate, so that the two nuts 614 drive the first half ring 600 and the second half ring 601 to approach or separate from each other, and the distance between the first half ring 600 and the second half ring 601 is adjusted.

Optionally, the nut 614 is connected to the first half ring 600 and the second half ring 601 through a connecting member 616.

Referring to fig. 5, a clamping block 602 is fixed on a side wall of the first half ring 600 opposite to the second half ring 601, a clamping groove 603 is formed on a side wall of the second half ring 601 opposite to the first half ring 600, the clamping groove 603 is matched with the clamping block 602 to ensure the relative fixation of the first half ring 600 and the second half ring 601, and simultaneously, the first half ring 600 and the second half ring 601 can also play a role in limiting the two, in addition, in this embodiment, the first half ring 600 and the second half ring 601 are made of a material with elasticity, such as plastic.

A swimming training system comprising a freestyle land trainer as described above.

The above disclosure is only for a few specific embodiments of the present invention, however, the present invention is not limited to the above embodiments, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present invention.