Badminton swing stretching training device

Abstract

The present application relates to a kind of training devices, especially a kind of badminton swing stretching training device.The purpose of the present application is to provide a kind of badminton swing stretching training device, which can help players to swing, correct the posture of players, and assist the standardization of action, comprising base, mounting cylinder, mounting box, first limiting ring and second limiting ring, etc.;Two staggered openings are opened in the top of base, mounting cylinder is fixedly connected to one end side of base, mounting cylinder is hollow and vertically opened in side, second limiting ring is fixedly installed in the upper part of mounting cylinder, mounting box is fixedly connected to the top of mounting cylinder, and mounting cylinder and mounting box are connected.The present application is matched by base, mounting cylinder, mounting box, first limiting ring, second limiting ring, counterweight mechanism, buffer mechanism and training mechanism, to help players to swing while assisting players to carry out tension training, so as to improve the arm strength of players, and can correct the posture of players, and assist the standardization of action of players.

Description

Technical Field

[0001] This invention relates to a training device, and more particularly to a badminton racket swing stretching training device. Background Technology

[0002] Playing badminton is about "doing complex things simply and repeating simple things." To play a good high drop shot from the backcourt, it's not that complicated; it boils down to one thing: practice your swing motion a lot.

[0003] Swing practice is an important step in refining and solidifying the movement, and in streamlining the transmission of power. It plays a crucial role in connecting the preceding and following movements.

[0004] Current techniques typically rely solely on the player's own feel for the swing motion. Without professional coaching, this can easily lead to distorted and non-standard movements. Repeatedly practicing these non-standard movements can become a habit, negatively impacting a player's badminton training. However, hiring a coach requires a substantial amount of time and money. Summary of the Invention

[0005] In order to overcome the shortcomings of existing technologies where players rely solely on their own sense of touch to swing the racket, making it difficult to achieve standard movements, this invention provides a badminton racket swing stretching training device that can help players swing the racket, correct their posture, and assist in standardizing their movements.

[0006] A badminton swing stretching training device includes a base, a mounting cylinder, a mounting box, a first limiting ring, a second limiting ring, a counterweight mechanism, and a training mechanism. The top of the base has two staggered openings. The mounting cylinder is fixedly connected to one side of the base. The mounting cylinder is hollow and has a vertical opening on its side. The second limiting ring is fixedly installed in the upper part of the mounting cylinder. The mounting box is fixedly connected to the top of the mounting cylinder. The mounting cylinder and the mounting box are connected at the connection point. The first limiting ring is fixedly installed in the upper part of the mounting box. The counterweight mechanism is installed in the mounting cylinder and the top of the mounting box together to adjust the swing stretching force to suit different individuals. The training mechanism is installed in the mounting cylinder and cooperates with the shoulder area of ​​the human body to train arm stretching force.

[0007] As a further preferred embodiment, the counterweight mechanism includes a fixed cylinder, a connecting plate, a pull tube, a limiting frame, a pull wire, a counterweight block, an insertion rod, and a counterweight rod. The fixed cylinder is installed inside the mounting cylinder, and an opening on the side of the fixed cylinder mates with the opening of the mounting cylinder to form a counterweight opening. A connecting plate is installed on the top of the mounting box, and a limiting frame and a pull wire are installed on the top of the connecting plate. A pull wire is installed inside the limiting frame and mates with the pull wire. A pull tube is installed at the bottom of the connecting plate, and the pull wire passes through the limiting frame and the connecting plate into the pull tube. A vertical insertion rod, which contacts the bottom of the fixed cylinder without external force, is fixed to the bottom of the pull tube and the pull wire. The insertion rod has several insertion holes, and several counterweight blocks are arranged around the insertion rod. Each counterweight block has a through hole, which mates with the insertion holes to form a counterweight hole. A counterweight rod is slidably installed through the counterweight hole. By inserting the counterweight rod into the counterweight holes at different heights, the tension adjustment function can be achieved.

[0008] As a further preferred embodiment, the counterweight mechanism also includes a lower force ring, a middle force ring, and an upper force ring. The upper end of the string cooperates with the badminton racket. The upper force ring, the middle force ring, and the lower force ring are respectively fitted on three positions on the badminton racket: the top, the shaft, and the handle. The string can be movably connected to one of the three, and the desired tension can be adjusted through leverage.

[0009] As a further preferred embodiment, the training mechanism includes a connecting cylinder, a connecting rod, a protruding rod, a pull rope, a sliding frame, a large gear, a medium gear, a small gear, a spiral rod, a connecting rope, a connecting block, a shoulder strap, and a first adjustment assembly. The connecting cylinder is rotatably mounted within both the first and second limiting rings. The outer periphery of the portion of the connecting cylinder located inside the mounting box has evenly spaced protrusions. Two opposing sliding openings are opened on the side wall of the mounting box. A sliding frame is installed on the inner side wall of the mounting box, with sliding frames that mate with the sliding openings. Both sliding frames are slidably mounted within their respective sliding positions. There is a convex rod, and the two convex rods have convex protrusions facing each other and meshing with a large gear. A connecting rod that passes through a sliding port is fixed to the side of the convex rod without convex protrusions. A pull rope is fixed to the end of the connecting rod. A small gear is fixed to the top of the large gear. The small gear and a convex protrusion on the outside of the connecting cylinder mesh with a middle gear. A first adjustment component is installed at one end of the pull rope. A connecting rope is connected to the side of the first adjustment component. A connecting block is movably connected to one end of the connecting rope. An annular shoulder strap is fixed to the side of the connecting block. The inner wall of the connecting cylinder has a spiral pattern. A spiral rod that matches the spiral pattern is sleeved on the outside of the pull tube.

[0010] As a further preferred embodiment, the first adjustable distance assembly includes a mounting shell, a threaded rod, a sliding plate, and a first handle. One end of the pull rope is externally slidably mounted on the mounting shell, and a sliding groove is opened inside the mounting shell. The sliding plate is slidably mounted on the mounting shell through the sliding groove. The sliding plate is in contact with the pull rope. A threaded hole is opened on the side of the mounting shell and a threaded rod is threadedly connected to it. One end of the threaded rod is rotatably connected to the side of the sliding plate and the other end extends out of the mounting shell. The first handle is fixedly connected to the end of the threaded rod that extends out of the mounting shell.

[0011] As a further preferred embodiment, a second adjusting mechanism is also included. The second adjusting mechanism includes a foot pedal, a rack, a first gear, a second gear, a worm gear, a worm, and a second handle. The first gear is located inside the base, and the rack meshes with both sides of the first gear. The foot pedal is fixedly connected to the top of the rack. The second gear also meshes with the periphery of the first gear, and the worm gear is fixedly connected to the top of the second gear. A worm is rotatably connected inside the base, and the worm meshes with the worm gear. The second handle is rotatably connected to the top right side of the base. The second handle and the worm are driven by a bevel gear set.

[0012] As a further preferred embodiment, an anti-slip mat is also included, with the top of the foot pedal having an anti-slip mat to increase the friction between the sole of the foot and the foot pedal, thereby preventing slipping.

[0013] As a further preferred embodiment, it also includes an upper washer, a return spring, a lower washer, and a buffer washer. The upper washer is fixed to the bottom of the connecting cylinder and is fixed to the inner wall of the fixed cylinder. Several return springs are fixed to the bottom of the upper washer, and the bottom ends of the return springs are all fixed to the lower washer. A buffer washer is also provided at the bottom of the lower washer. Both the lower washer and the buffer washer slide against the inner wall of the fixed cylinder.

[0014] The beneficial effects are: 1. Through the cooperation between the base, mounting cylinder, mounting box, first limiting ring, second limiting ring, counterweight mechanism, buffer mechanism and training mechanism, the present invention helps players to swing the racket while assisting them in pulling training, thereby improving the player's arm strength, correcting the player's posture and assisting the player in standardizing the swing action.

[0015] 2. The present invention, through the cooperation of the first adjusting component, the second adjusting mechanism and the anti-slip mat, can adapt to the needs of people of different heights and ages by adjusting the distance between feet and the distance of the pull line, and has an anti-slip function, making it safer and more practical. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2 This is a cross-sectional view of the base and mounting cylinder of the present invention.

[0018] Figure 3 This is a three-dimensional structural diagram of the fixing cylinder of the present invention.

[0019] Figure 4 For the present invention Figure 3 Enlarged view of point A in the image.

[0020] Figure 5 This is a three-dimensional structural diagram of some components in the counterweight mechanism of the present invention.

[0021] Figure 6 This is a three-dimensional structural diagram of the lower force-balancing ring, middle force-balancing ring, and upper force-balancing ring of the present invention.

[0022] Figure 7 This is a three-dimensional structural diagram of some components in the training mechanism of the present invention.

[0023] Figure 8 This is a three-dimensional structural diagram of another component in the training mechanism of the present invention.

[0024] Figure 9 This is a three-dimensional structural diagram of the screw rod of the present invention.

[0025] Figure 10 This is a three-dimensional structural diagram of the first distance adjustment component and some parts of the training mechanism of the present invention.

[0026] Figure 11 This is a three-dimensional structural diagram of the first distance adjustment component of the present invention.

[0027] Figure 12 This is a three-dimensional structural diagram of the second adjusting mechanism and the anti-slip pad of the present invention.

[0028] Figure 13 This is a three-dimensional structural diagram of the buffer mechanism of the present invention.

[0029] In the attached diagram, the following are the reference numerals: 1-base, 2-mounting cylinder, 3-mounting box, 4-counterweight mechanism, 41-fixed cylinder, 42-connecting plate, 43-pull tube, 44-limiting frame, 45-pulley, 46-pull line, 47-counterweight block, 48-counterweight rod, 49-lower force ring, 410-middle force ring, 411-upper force ring, 412-insertion rod, 5-training mechanism, 51-connecting cylinder, 52-connecting rod, 53-protrusion rod, 54-pull rope, 55-sliding frame, 56-large gear, 57-middle gear, 58-small gear, 59-screw rod, 510-connecting... 511-Connecting block, 512-Shoulder strap, 6-First adjustment assembly, 61-Mounting shell, 62-Threaded rod, 63-First handle, 64-Sliding plate, 7-Second adjustment mechanism, 71-Foot pedal, 72-Rack and pinion, 73-First gear, 74-Second gear, 75-Worm gear, 76-Worm, 77-Second handle, 8-Anti-slip pad, 9-Buffer mechanism, 91-Upper washer, 92-Reset spring, 93-Lower washer, 94-Buffer washer, 10-First limiting ring, 11-Second limiting ring, 200-Badminton racket, 300-Arm. Detailed Implementation

[0030] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0031] Example 1: A badminton racket swing stretching training device, such as Figures 1-11 As shown, it includes a base 1, a mounting cylinder 2, a mounting box 3, a first limiting ring 10, a second limiting ring 11, a counterweight mechanism 4, and a training mechanism 5. The top of the base 1 has two staggered openings. The mounting cylinder 2 is fixedly connected to one side of the base 1. The mounting cylinder 2 is hollow and has a vertical opening on its side. The second limiting ring 11 is fixedly installed in the upper part of the mounting cylinder 2. The mounting box 3 is fixedly connected to the top of the mounting cylinder 2. The mounting cylinder 2 and the mounting box 3 are connected at the connection point. The first limiting ring 10 is fixedly installed in the upper part of the mounting box 3. The counterweight mechanism 4 is installed in the mounting cylinder 2 and the top of the mounting box 3 together, which is used to adjust the swing pull force to suit different individuals. The training mechanism 5 is installed in the mounting cylinder 2. The training mechanism 5 cooperates with the human shoulder to train the arm pull force of 300°.

[0032] like Figures 3-5As shown, the counterweight mechanism 4 includes a fixed cylinder 41, a connecting plate 42, a pull tube 43, a limiting frame 44, a pulley 45, a pull wire 46, a counterweight block 47, an insertion rod 412, and a counterweight rod 48. The fixed cylinder 41 is installed inside the mounting cylinder 2. The side of the fixed cylinder 41 also has an opening that matches the opening of the mounting cylinder 2 to form a counterweight opening. The top of the mounting box 3 is equipped with a connecting plate 42. The top of the connecting plate 42 is equipped with a limiting frame 44 and a pulley 45. The limiting frame 44 is equipped with a pull wire 46, which cooperates with the pulley 45. The bottom of the connecting plate 42 is equipped with... A pull tube 43 is provided, and a pull wire 46 enters the pull tube 43 through a limiting bracket 44 and a connecting plate 42. The bottom of the pull tube 43 and the pull wire 46 are fixed together with a vertical insertion rod 412 that contacts the bottom of the fixed cylinder 41 when not subjected to external force. The insertion rod 412 has multiple insertion holes and multiple counterweights 47 are provided around the insertion rod 412. The counterweights 47 have through holes, which cooperate with the insertion holes to form counterweight holes. A counterweight rod 48 is slidably provided through the counterweight holes. By inserting the counterweight rod 48 into the counterweight holes at different heights, the tension adjustment function can be realized.

[0033] like Figure 6 As shown, the counterweight mechanism 4 also includes a lower force ring 49, a middle force ring 410, and an upper force ring 411. The upper end of the string 46 is connected to the badminton racket 200. The upper force ring 411, the middle force ring 410, and the lower force ring 49 are respectively fitted on the top, shaft, and handle of the badminton racket 200. The string 46 can be movably connected to one of the three, and the desired tension can be adjusted by lever action.

[0034] like Figures 7-11As shown, the training mechanism 5 includes a connecting cylinder 51, a connecting rod 52, a protruding rod 53, a pull rope 54, a sliding frame 55, a large gear 56, a medium gear 57, a small gear 58, a spiral rod 59, a connecting rope 510, a connecting block 511, a shoulder strap 512, and a first adjustment assembly 6. The connecting cylinder 51 is rotatably mounted inside the first limiting ring 10 and the second limiting ring 11. The outer periphery of the connecting cylinder 51 located inside the mounting box 3 is provided with evenly spaced protrusions. The side wall of the mounting box 3 has two opposing sliding openings. The inner side wall of the mounting box 3 is equipped with a sliding frame 55, and the sliding frame of the sliding frame 55 cooperates with the sliding opening. Both sliding frames 55 are slidably mounted with protruding rods 53. Two protrusion rods 53 have protrusions facing each other and meshing with a large gear 56. A connecting rod 52 that passes through a sliding port is fixed to the side of the protrusion rod 53 without protrusions. A pull rope 54 is fixed to the end of the connecting rod 52. A small gear 58 is fixed to the top of the large gear 56. The small gear 58 and a protrusion on the outside of the connecting cylinder 51 mesh with a middle gear 57. A first adjustment component 6 is installed at one end of the pull rope 54. A connecting rope 510 is connected to the side of the first adjustment component 6. A connecting block 511 is movably connected to one end of the connecting rope 510. An annular shoulder strap 512 is fixed to the side of the connecting block 511. The inner wall of the connecting cylinder 51 has a spiral pattern. A spiral rod 59 that matches the spiral pattern is sleeved on the outside of the pull tube 43.

[0035] like Figure 10 and Figure 11 As shown, the first adjustable distance assembly 6 includes a mounting shell 61, a threaded rod 62, a sliding plate 64, and a first handle 63. One end of the pull rope 54 is externally slidably mounted on the mounting shell 61. A sliding groove is opened inside the mounting shell 61. The sliding plate 64 is slidably mounted on the mounting shell 61 through the sliding groove. The sliding plate 64 is in contact with the pull rope 54. A threaded hole is opened on the side of the mounting shell 61 and the threaded rod 62 is threadedly connected to it. One end of the threaded rod 62 is rotatably connected to the side of the sliding plate 64 and the other end protrudes from the mounting shell 61. The first handle 63 is fixedly connected to the end of the threaded rod 62 that protrudes from the mounting shell 61.

[0036] like Figure 13 As shown, it also includes an upper gasket 91, a return spring 92, a lower gasket 93, and a buffer gasket 94. The upper gasket 91 is fixedly connected to the bottom of the connecting cylinder 51. The upper gasket 91 is fixedly connected to the inner wall of the fixed cylinder 41. Multiple return springs 92 are fixedly connected to the bottom of the upper gasket 91. The lower gasket 93 is fixedly connected to the bottom of the return springs 92. A buffer gasket 94 is also provided at the bottom of the lower gasket 93. Both the lower gasket 93 and the buffer gasket 94 are slidably engaged with the inner wall of the fixed cylinder 41.

[0037] When practicing swings, the player puts on shoulder straps 512 and holds the racket handle with one hand. Then, the string 46 is connected to one of the lower force ring 49, middle force ring 410, or upper force ring 411. The weight bar 48 is then inserted into the desired weight hole, with the required tension increasing sequentially from bottom to top to adjust to a suitable level. The string 46 pulls the insertion rod 412 upwards, which in turn moves the weight bar 48. The weight bar 48 then moves the weight block 47 inserted into it, as well as the weight block above it. 47 move upwards together. When the uppermost counterweight 47 slides to the top of the fixed cylinder 41, the counterweight 47 impacts the buffer pad 94. The buffer pad 94 reduces the impact force of the counterweight 47. At the same time, the buffer pad 94 pushes the lower pad 93 upwards. The lower pad 93 pushes and compresses the return spring 92, thereby further reducing the impact force. As the pull cable 46 pulls the counterweight 47 upwards, the pull tube 43 follows and drives the screw rod 59 upwards. The screw rod 59 drives the connecting cylinder 51 to rotate through the thread. The rotation of the connecting cylinder 51 is transmitted through the gear 57 in the upper protrusion transmission. The gear 57 drives the pinion 58, which in turn drives the gear 56 to rotate. The rotation of the gear 56 causes the two opposing protruding rods 53 meshing with it to slide in opposite directions. The protruding rods 53 drive the connecting rod 52, which in turn moves the pull rope 54. The pull rope 54 then moves the first adjusting assembly 6, which in turn moves the connecting rope 510. The connecting rope 510 then moves the shoulder strap 512, thus assisting the player in swinging the racket and correcting their swing posture. For players of different heights, the first handle 63 can be rotated in the opposite direction first. A first handle 63 drives the threaded rod 62 to rotate in the opposite direction, thereby causing the sliding plate 64 to slide and loosen the pull rope 54. Then, the sliding mounting shell 61 is adjusted to a suitable position on the pull rope 54. Then, the first handle 63 is rotated in the forward direction, which drives the threaded rod 62 to rotate in the forward direction. The threaded rod 62 pushes the sliding plate 64 to slide and clamp the pull rope 54, so that the mounting shell 61 is fixed in position. This allows the player to find a distance suitable for his height to swing the racket, avoiding the pull rope 54 from being too long and the shoulder strap 512 from coming loose. At the same time, it also avoids the pull rope 54 from being too short, which can easily cause shoulder strain.

[0038] Example 2: Based on Example 1, such as Figure 12As shown, it also includes a second adjusting mechanism 7, which includes a foot pedal 71, a rack 72, a first gear 73, a second gear 74, a worm gear 75, a worm 76, and a second handle 77. The base 1 has a first gear 73 inside, with the rack 72 meshing on both sides of the first gear 73. The top of the rack 72 is fixedly connected to the foot pedal 71. The second gear 74 also meshes around the first gear 73, with the worm gear 75 fixedly connected to the top of the second gear 74. The worm 76 is rotatably connected inside the base 1 and meshes with the worm gear 75. The second handle 77 is rotatably connected to the top right side of the base 1. The second handle 77 and the worm 76 are driven by a bevel gear set.

[0039] like Figure 12 As shown, it also includes an anti-slip mat 8. The top of the foot pedal 71 is provided with an anti-slip mat 8, which is used to increase the friction between the sole of the foot and the foot pedal 71 to prevent slipping.

[0040] For people of different heights, the second handle 77 can be rotated, which drives the bevel gear to rotate. The bevel gear drives the worm gear 76 to rotate, which drives the worm wheel 75 to rotate. The worm wheel 75 drives the second gear 74, which drives the first gear 73 to rotate. The first gear 73 drives the racks 72 on both sides to move in opposite directions, thereby moving the foot pedals 71 through the racks 72 to adjust the distance between the two foot pedals 71. Conversely, when the foot pedals 71 are pushed by a person's foot, the worm wheel 75 cannot drive the worm gear 76 to rotate, so that the foot pedals 71 will not be displaced when a person steps on them. This adapts to the needs of people of different heights and different foot spacings. At the same time, an anti-slip mat 8 with anti-slip material is used to ensure that players will not slip during the swing, making it safer and more practical.

[0041] It should be understood that this embodiment is for illustrative purposes only and is not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A badminton racket swing stretching training device, comprising a base (1), a mounting cylinder (2), a mounting box (3), a first limiting ring (10), and a second limiting ring (11), wherein the top of the base (1) has two staggered openings, the mounting cylinder (2) is fixedly connected to one side of the base (1), the mounting cylinder (2) is hollow and has a vertical opening on its side, the second limiting ring (11) is fixedly installed in the upper part of the mounting cylinder (2), the mounting box (3) is fixedly connected to the top of the mounting cylinder (2), the mounting cylinder (2) and the mounting box (3) are connected, and the first limiting ring (10) is fixedly installed in the upper part of the mounting box (3), characterized in that: It also includes a counterweight mechanism (4) and a training mechanism (5). The counterweight mechanism (4) is installed inside the mounting cylinder (2) and the top of the mounting box (3). The training mechanism (5) is installed inside the mounting cylinder (2) and is coordinated with the human shoulder. The counterweight mechanism (4) includes a connecting plate (42) and a pull tube (43). The connecting plate (42) is installed on the top of the mounting box (3), and the pull tube (43) is installed on the bottom of the connecting plate (42). The training mechanism (5) includes a connecting cylinder (51), a connecting rod (52), a protruding rod (53), a pull rope (54), a sliding frame (55), a large gear (56), a medium gear (57), a small gear (58), a spiral rod (59), a connecting rope (510), a connecting block (511), a shoulder strap (512), and a first adjustment assembly (6). The connecting cylinder (51) is rotatably installed in the first limiting ring (10) and the second limiting ring (11). The outer periphery of the connecting cylinder (51) located inside the mounting box (3) is provided with evenly spaced protrusions. The side wall of the mounting box (3) has two opposing sliding openings. The inner side wall of the mounting box (3) is equipped with a sliding frame (55). The sliding frame of the sliding frame (55) cooperates with the sliding opening. Both sliding frames (55) are slidably installed with protruding rods (56, 57, 58, 59, 510, 511, 512, and 513. 3) The two protrusion rods (53) have protrusions facing each other and meshing with a large gear (56). A connecting rod (52) that passes through the sliding port is fixed to the side of the protrusion rod (53) without protrusions. A pull rope (54) is fixed to the end of the connecting rod (52). A small gear (58) is fixed to the top of the large gear (56). The small gear (58) meshes with a middle gear (57) with a protrusion on the outside of the connecting cylinder (51). A first adjustment component (6) is installed at one end of the pull rope (54). A connecting rope (510) is connected to the side of the first adjustment component (6). A connecting block (511) is movably connected to one end of the connecting rope (510). A ring shoulder strap (512) is fixed to the side of the connecting block (511). A spiral pattern is opened on the inner wall of the connecting cylinder (51). A spiral rod (59) that matches the spiral pattern is sleeved on the outside of the pull tube (43).

2. The badminton swing stretching training device as described in claim 1, characterized in that: The counterweight mechanism (4) also includes a fixed cylinder (41), a limiting frame (44), a pulley (45), a pull wire (46), a counterweight block (47), a plug rod (412), and a counterweight rod (48). The fixed cylinder (41) is installed inside the mounting cylinder (2). The fixed cylinder (41) has an opening on its side that matches the opening of the mounting cylinder (2) to form a counterweight opening. The top of the connecting plate (42) is equipped with a limiting frame (44) and a pulley (45). The limiting frame (44) is provided with a pull wire (46). The pull wire (46) and the pulley (47) are connected to each other. 5) The pull wire (46) enters the pull tube (43) through the limit frame (44) and the connecting plate (42). The bottom of the pull tube (43) and the pull wire (46) are fixed together with a vertical insertion rod (412) that contacts the bottom of the fixed cylinder (41) when not subjected to external force. The insertion rod (412) has several insertion holes. The insertion rod (412) is provided with several counterweights (47) around its body. The counterweights (47) have through holes. The through holes and the insertion holes cooperate to form counterweight holes. The counterweight rod (48) is provided in a sliding manner through the counterweight holes.

3. The badminton swing stretching training device as described in claim 2, characterized in that: The counterweight mechanism (4) also includes a lower force ring (49), a middle force ring (410) and an upper force ring (411). The upper end of the string (46) is matched with the badminton racket (200). The upper force ring (411), the middle force ring (410) and the lower force ring (49) are respectively fitted on the top, shaft and handle of the badminton racket (200). The string (46) can be movably connected to one of the three.

4. The badminton swing stretching training device as described in claim 3, characterized in that: The first adjustable distance assembly (6) includes a mounting shell (61), a threaded rod (62), a sliding plate (64), and a first handle (63). The mounting shell (61) is externally slidably mounted on one end of the pull rope (54). A sliding groove is opened inside the mounting shell (61). The sliding plate (64) is slidably mounted on the mounting shell (61) through the sliding groove. The sliding plate (64) is in contact with the pull rope (54). A threaded hole is opened on the side of the mounting shell (61) and the threaded rod (62) is threadedly connected to it. One end of the threaded rod (62) is rotatably connected to the side of the sliding plate (64) and the other end passes through the mounting shell (61). The first handle (63) is fixedly connected to the end of the threaded rod (62) that passes through the mounting shell (61).

5. The badminton swing stretching training device as described in claim 4, characterized in that: It also includes a second adjustment mechanism (7), which includes a foot pedal (71), a rack (72), a first gear (73), a second gear (74), a worm gear (75), a worm (76), and a second handle (77). The base (1) is provided with a first gear (73), and the rack (72) meshes with both sides of the first gear (73). The top of the rack (72) is fixedly connected to the foot pedal (71). The second gear (74) also meshes with the circumference of the first gear (73). The worm gear (75) is fixedly connected to the top of the second gear (74). The worm (76) is rotatably connected inside the base (1). The worm (76) meshes with the worm gear (75). The second handle (77) is rotatably connected to the right side of the top of the base (1). The second handle (77) and the worm (76) are driven by a bevel gear set.

6. The badminton swing stretching training device as described in claim 5, characterized in that: It also includes an anti-slip mat (8), and the foot pedal (71) is provided with an anti-slip mat (8) on top.

7. The badminton swing stretching training device as described in claim 6, characterized in that: It also includes an upper gasket (91), a return spring (92), a lower gasket (93), and a buffer gasket (94). The upper gasket (91) is fixed to the bottom of the connecting cylinder (51). The upper gasket (91) is fixed to the inner wall of the fixed cylinder (41). Several return springs (92) are fixed to the bottom of the upper gasket (91). The lower gasket (93) is fixed to the bottom of the return springs (92). The buffer gasket (94) is also provided at the bottom of the lower gasket (93). The lower gasket (93) and the buffer gasket (94) are both in sliding contact with the inner wall of the fixed cylinder (41).

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