Damping structure with adjustable damping force

Abstract

The utility model discloses a damping structure with adjustable damping force, which comprises a support frame, a rotating shaft rotatably mounted on the support frame, a rope wheel sleeved on the rotating shaft, a pull rope wound on the rope wheel, a friction wheel fixed on the rotating shaft and a friction component arranged on the support frame, the friction component comprises a left clamp body and a right clamp body, and the left clamp body and the right clamp body are pivotally connected through a pivot. The right clamp body is provided with a first clamping end and a first adjusting end, the left clamp body is provided with a second clamping end and a second adjusting end, the first clamping end is opposite to the second clamping end, contact portions are arranged on the inner sides of the first clamping end and the second clamping end, a clamping opening for a friction wheel to be inserted is formed between the two contact portions, and the first adjusting end is opposite to the second adjusting end. The first adjusting end is connected with an adjusting screw rod, the adjusting screw rod penetrates through a through hole in the second adjusting end to be in threaded connection with an adjusting nut, the width of the clamping opening is changed by screwing the adjusting nut along the adjusting screw rod, and therefore the effect of changing rotation resistance is achieved, and different exercise requirements are met.

Description

Technical Field

[0001] This utility model relates to a sports training device, and more particularly to a damping structure with adjustable damping force. Background Technology

[0002] In existing technologies, users typically use fitness equipment to exercise in order to achieve better fitness or rehabilitation results. There are various types of fitness equipment, among which rope-assisted reciprocating exercise equipment is widely used in various scenarios such as indoor spaces, residential areas, and parks. For example, swimming trainers simulate underwater swimming movements to assist in the swimming training process.

[0003] Typical cable pull-up equipment consists of a rotating wheel and a friction wheel coaxially connected by a pivot. The equipment has friction components that abut against the friction wheel. The cable is wound around the rotating wheel, which is connected to the pivot via a clutch mechanism. When the user pulls the cable outward, the clutch mechanism engages the rotating wheel and pivot, causing the friction wheel on the pivot to rotate relative to the friction components, generating damping force. When the user releases force, the clutch mechanism disengages the rotating wheel and pivot, and the rotating wheel, under the action of an elastic element, resets and rotates to rewind the cable onto the rotating wheel, thus initiating the next cable pull cycle.

[0004] The damping force is generally provided by the friction between the friction component and the friction wheel. However, the friction component is usually fixed on the rope exercise equipment and its position cannot be changed, resulting in a constant damping force that cannot be adjusted according to the exercise needs of different exercisers. This leads to poor applicability and affects exercise efficiency. Utility Model Content

[0005] Based on the problem that the rotational resistance is constant and cannot be adjusted according to the different exercise needs of different exercisers, resulting in poor applicability and affecting exercise efficiency, this utility model provides a damping structure with adjustable damping force.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a damping structure with adjustable damping force, including a support frame, a rotating shaft rotatably mounted on the support frame, a rope wheel fitted on the rotating shaft, a pull rope wound on the rope wheel, a friction wheel fixed on the rotating shaft, and a friction assembly that rubs against the friction wheel on the support frame. The friction assembly includes a left clamp body and a right clamp body, which are pivotally connected by a pivot. The right clamp body has a first clamping end and a first adjusting end. The portion of the right clamp body from the rotation point to the first clamping end serves as a first clamping arm, and the portion from the rotation point to the first adjusting end serves as a first adjusting arm. The left clamp body has a second clamping end and a second adjusting end. The adjusting end has a second clamping arm on the left clamp body, extending from the rotation point to the second clamping end, and a second adjusting arm on the left clamp body, extending from the rotation point to the second adjusting end. The first clamping end and the second clamping end are opposite each other, and both have contact parts on their inner sides that rub against the friction wheel. A clamping opening for the friction wheel to be inserted is formed between the contact parts on the first clamping end and the contact parts on the second clamping end. The first adjusting end and the second adjusting end are opposite each other. An adjusting screw is connected to the first adjusting end, and a through hole is provided on the second adjusting end for the adjusting screw to pass through. The adjusting screw passes through the through hole and is threadedly connected to the adjusting nut. The width of the clamping opening is changed by rotating the adjusting nut along the adjusting screw.

[0007] A further preferred technical solution of this utility model is: a reset spring is provided between the left clamp and the right clamp, and the reset spring acts on the left clamp and the right clamp to make the first clamping end and the second clamping end have a tendency to open to both sides.

[0008] A further preferred embodiment of this utility model is as follows: a mounting base is fixed on the inner side of the first clamping end, and a friction plate is fixed on the mounting base, with the friction plate serving as the contact part that contacts and rubs with the friction wheel.

[0009] A further preferred embodiment of this utility model is as follows: a mounting base is fixed on the inner side of the second clamping end, and a friction plate is fixed on the mounting base, with the friction plate serving as the contact part that contacts and rubs with the friction wheel.

[0010] A further preferred embodiment of this utility model is: the side wall of the adjusting nut is provided with at least one raised rotating protrusion for the hand to rotate and adjust the nut.

[0011] A further preferred embodiment of this utility model is as follows: the adjusting screw is connected to the first adjusting end by a mounting bolt and a first mounting nut. A flat connecting plate is fixed to one end of the adjusting screw. The connecting plate has a first connecting hole for the mounting bolt to pass through. The first adjusting end has a second connecting hole for the mounting bolt to pass through. The mounting bolt passes through the first connecting hole and the second connecting hole and is threadedly connected to the first mounting nut.

[0012] A further preferred embodiment of this utility model is as follows: the support frame is provided with a mounting hole for mounting a pivot. The pivot includes a shaft and a support column located in the middle of the shaft. The diameter of the support column is larger than the diameter of the shaft. Both the upper and lower ends of the shaft are provided with external threads. The shaft portion located below the support column passes through the mounting hole and the lower end face of the support column abuts against the support frame. The lower end of the shaft passing through the mounting hole is threadedly connected to a lower mounting nut. The left and right clamps are coaxially mounted on the shaft portion above the support column and rotate. The upper end of the shaft is threadedly connected to an upper mounting nut for limiting the left and right clamps.

[0013] A further preferred embodiment of this invention is that the friction plate is arc-shaped and is used to contact the outer edge of one end face of the friction wheel.

[0014] A further preferred embodiment of this utility model is that a gap is provided between the through hole and the adjusting screw through which it passes, allowing the adjusting screw to move within the gap.

[0015] A further preferred embodiment of this utility model is as follows: the left clamp body and the right clamp body are staggered, and the staggered positions are pivotally connected together. When the adjusting nut is rotated along the adjusting screw and the second adjusting end is pushed closer to the first adjusting end, the clamp width becomes smaller.

[0016] Compared with the prior art, the advantage of this utility model is that a friction assembly that rubs against a friction wheel is set on the support frame. The friction assembly includes a left clamp body and a right clamp body, which are pivotally connected by a pivot. The right clamp body has a first clamping end and a first adjusting end, and the left clamp body has a second clamping end and a second adjusting end. The first clamping end and the second clamping end are opposite each other, and both have contact parts on their inner sides that rub against the friction wheel. The contact parts on the first clamping end and the contact parts on the second clamping end form a clamping opening for the friction wheel to be inserted. The first adjusting end and the second adjusting end are opposite each other. An adjusting screw is connected to the first adjusting end, and a through hole is provided on the second adjusting end for the adjusting screw to pass through. Connected threaded to an adjusting nut, the clamp width is altered by turning the adjusting nut along the adjusting screw. The contact portion on the clamping end presses against the end face of the friction wheel. When the shaft drives the friction wheel to rotate, the friction between the contact portion and the rotating friction wheel provides rotational resistance to the shaft. Changing the clamp width by turning the adjusting nut alters the pressure of the contact portion on the friction wheel, thus changing the friction between the friction wheel and the contact portion, thereby adjusting the rotational resistance. By adjusting the magnitude of the rotational resistance applied to the shaft, the system can meet the strength training needs of different exercisers, making it more versatile. Exercisers can choose the resistance level according to their own physical condition for higher training efficiency. Attached Figure Description

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the present invention. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0018] Figure 1 A schematic diagram of the overall structure of a rope-type exercise equipment;

[0019] Figure 2 A cross-sectional diagram of the entire rope-type exercise equipment;

[0020] Figure 3 Diagram showing the usage status of rope-type exercise equipment;

[0021] Figure 4 This is a schematic diagram of the overall structure of the damping structure;

[0022] Figure 5 This is a schematic diagram of the friction assembly.

[0023] Figure 6 This is a breakdown diagram of the components of the friction assembly;

[0024] Figure 7 Schematic diagram of the damping structure Figure 1 ;

[0025] Figure 8 for Figure 7 A magnified view of part A;

[0026] Figure 9 Schematic diagram of the damping structure Figure 2 ;

[0027] Figure 10 for Figure 9 A magnified view of section B.

[0028] In the diagram: 1. Support frame; 2. Sheave; 3. Pull rope; 4. Swing frame; 5. Guide pulley; 6. Fixed pulley; 7. Handle; 8. Connecting ring; 9. Friction assembly; 10. Retrieval wheel; 11. Elastic rope; 12. Upper guide wheel; 13. Rotating shaft; 14. Friction wheel; 15. One-way bearing; 16. Upper mounting nut; 17. Lower guide wheel; 18. First mounting base; 19. Support bearing; 20. Bearing hole; 21. Adjusting nut; 22. Adjusting screw; 23. Right clamp body; 24. Left clamp body; 25. Clamping jaw; 26. Second... 27. Mounting base; 28. Friction plate; 29. ​​First clamping end; 30. First clamping arm; 31. Pivot; 32. First adjusting arm; 33. First adjusting end; 34. First mounting nut; 35. Mounting bolt; 36. Second adjusting end; 37. Second clamping arm; 38. Rotating protrusion; 39. Through hole; 40. Second clamping end; 41. Connecting plate; 42. First connecting hole; 43. Second connecting hole; 44. Lower mounting nut; 45. Shaft; 46. Mounting hole; 47. Support column; 48. Reset mechanism. Detailed Implementation

[0029] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0030] It should be noted that similar labels in the following figures indicate similar items; therefore, once an item is defined in one figure, it may not be further defined and explained in subsequent figures.

[0031] Figures 1-10As shown, the rope-type exercise equipment includes a support frame 1, on which a rotating shaft 13 is rotatably mounted. A rope wheel 2 is fitted on the rotating shaft 13, and a rope 3 is wound around the rope wheel 2. A friction wheel 14 is fixed on the rotating shaft 13. The support frame 1 is provided with a friction assembly 9 that rubs against the friction wheel 14. The friction assembly 9 includes a left clamp body 24, a right clamp body 23, an adjusting screw 22, and an adjusting nut 21. The left clamp body 24 and the right clamp body 23 are pivotally connected by a pivot 30. The right clamp body 23 has a first clamping end 28 and a first adjusting end 32. The portion of the right clamp body 23 from the rotation point to the first clamping end 28 serves as a first clamping arm 29, and the portion from the rotation point to the first adjusting end 32 serves as a first adjusting arm 31. The left clamp body 24 has a second clamping end 40 and a second adjusting end 36. The portion of the clamp body 24 from the rotation point to the second clamping end 40 serves as the second clamping arm 37, and the portion from the rotation point to the second adjusting end 36 serves as the second adjusting arm 35. The first clamping end 28 is opposite to the second clamping end 40, and both have contact portions on their inner sides that rub against the friction wheel 14. A clamping opening 25 for inserting the friction wheel 14 is formed between the contact portions on the first clamping end 28 and the contact portions on the second clamping end 40. The first adjusting end 32 is opposite to the second adjusting end 36, and an adjusting screw 22 is connected to the first adjusting end 32. The second adjusting end 36 has a through hole 39 through which the adjusting screw 22 passes. The adjusting screw 22 passes through the through hole 39 and is threadedly connected to the adjusting nut 21. The width of the clamping opening 25 is changed by rotating the adjusting nut 21 along the adjusting screw 22.

[0032] Figure 4 , Figure 5 As shown, the contact part on the clamping end presses against the end face of the friction wheel 14. When the pull rope 3 is pulled out, the pull rope 3 drives the rope wheel 2 to rotate. At the same time, the rotation of the rope wheel 2 drives the rotating shaft 13 to rotate. The friction wheel 14 rotates with the rotating shaft 13. During the rotation of the friction wheel 14, it rubs against the contact part on the clamping end. The friction between the friction wheel 14 and the contact part on the clamping end provides rotational resistance to the rotating shaft 13. The rotational resistance is transmitted to the rope wheel 2 through the rotating shaft 13, providing resistance to the process of pulling the rope 3, so as to achieve the exercise effect. When the width of the clamp 25 is changed by turning the adjusting nut 21 along the adjusting screw 22, the pressure of the contact part pressing on the friction wheel 14 will change, thereby changing the friction between the friction wheel 14 and the contact part, so as to adjust the rotational resistance. By adjusting the magnitude of the rotational resistance applied to the rotating shaft 13, the needs of different exercisers for strength training can be met, making it more applicable. Exercisers can choose the magnitude of resistance according to their own physical fitness, so as to make the exercise more efficient.

[0033] Figure 2As shown, the support frame 1 is provided with two first mounting seats 18. The two first mounting seats 18 are fixedly mounted on the support frame 1 by bolts. Each of the two first mounting seats 18 is provided with a bearing hole 20. A support bearing 19 is installed in the bearing hole 20. The rotating shaft 13 passes through the inner ring of the support bearing 19 installed on the two first mounting seats 18. The support bearing 19 supports the rotating shaft 13, so that the rotating shaft 13 is rotatably connected to the support frame 1.

[0034] Figure 5 , Figure 6 As shown, preferably, the left clamp body 24 and the right clamp body 23 are staggered, and the staggered positions are pivotally connected together by the pivot 30. When adjusting by rotating the adjusting nut 21 along the adjusting screw 22, the adjusting nut 21 is screwed towards the end of the adjusting screw 22 connected to the first adjusting end 32. The adjusting nut 21 presses on the outside of the second adjusting end 36 of the left clamp body 24 and pushes the second adjusting end 36 closer to the first adjusting end 32. During the process of the first adjusting end 32 and the second adjusting end 36 approaching each other, the left clamp body 24 and the right clamp body 23 rotate around the pivot 30, so that the first clamping end 28 and the second clamping end 40 approach each other, thereby reducing the width of the clamping jaw 25, increasing the pressure of the contact part on the friction wheel 14, and thus increasing the rotational resistance experienced by the rotating shaft 13 when it rotates.

[0035] A return spring is provided between the left clamp body 24 and the right clamp body 23. The return spring acts on the left clamp body 24 and the right clamp body 23, causing the first clamping end 28 and the second clamping end 40 to tend to open to both sides. When the adjusting nut 21 is screwed out towards the end of the adjusting screw 22 away from the first adjusting end 32, the return spring drives the left clamp body 24 and the right clamp body 23 to rotate and return to their original position around the pivot 30. This causes the first clamping end 28 and the second clamping end 40 to open to both sides, and the first adjusting end 32 and the second adjusting end 36 also open to both sides. This ensures that the outer side of the second adjusting end 36 is always tightly pressed against the adjusting nut 21. Through the action of the return spring on the left clamp body 24 and the right clamp body 23, the left clamp body 24 and the right clamp body 23 are always subjected to an opening force, thus maintaining the first clamping end 28 and the second clamping end 40 at the adjusted width, making the rotational resistance on the rotating shaft 13 more stable. The return spring can be a torsion spring.

[0036] Figure 9 , Figure 10As shown, the support frame 1 is provided with a mounting hole 46 for mounting the pivot 30. The pivot 30 includes a shaft 45 and a support column 47 located in the middle of the shaft 45. The diameter of the support column 47 is larger than the diameter of the shaft 45. Both the upper and lower ends of the shaft 45 are provided with external threads. The shaft portion located below the support column 47 passes through the mounting hole 46 and the lower end face of the support column 47 abuts against the support frame 1. The lower end of the shaft 45 passing through the mounting hole 46 is threadedly connected to the lower mounting nut 44. The left clamp 24 and the right clamp 23 are fitted onto the shaft portion above the support column 47 and rotate. The upper end of the shaft 45 is threadedly connected to the upper mounting nut 16, which limits the left clamp 24 and the right clamp 23.

[0037] Figure 7 , Figure 8 As shown, the adjusting screw 22 is connected to the first adjusting end 32 by the mounting bolt 34 and the first mounting nut 33. One end of the adjusting screw 22 is fixed with a flat connecting plate 41. The connecting plate 41 has a first connecting hole 42 for the mounting bolt 34 to pass through. The first adjusting end 32 has a second connecting hole 43 for the mounting bolt 34 to pass through. The mounting bolt 34 passes through the first connecting hole 42 and the second connecting hole 43 and is threadedly connected to the first mounting nut 33. The rod part of the mounting bolt 34 includes a smooth rod and a threaded rod. The connecting plate 41 and the first adjusting end 32 are fitted onto the smooth rod.

[0038] A gap is provided between the through hole 39 and the through-hole adjusting screw 22 to allow the adjusting screw 22 to move within it, so that when the adjusting nut 21 is screwed in or out along the adjusting screw 22 to rotate the left clamp 24 and the right clamp 23, the adjusting screw 22 will not get stuck on the inner wall of the through hole 39, preventing the left clamp 24 and the right clamp 23 from rotating relative to each other.

[0039] The adjusting nut 21 has at least one raised rotating protrusion 38 on its side wall for manual rotation of the adjusting nut 21. Preferably, the adjusting nut 21 is cylindrical in shape, and two rotating protrusions 38 are arranged in a ring on the outer wall of the adjusting nut 21 around its circumference, which facilitates manual rotation of the adjusting nut 21 without the need for external tools.

[0040] Figure 8 As shown, a second mounting base 26 is fixed on the inner side of both the first clamping end 28 and the second clamping end 40. A friction plate 27 is fixed on the second mounting base 26. The friction plate 27 serves as the contact part that rubs against the friction wheel 14. The friction plate 27 is arc-shaped and is used to contact the outer edge of one end face of the friction wheel 14. The arc shape of the friction plate 27 increases the contact area between the friction wheel 14 and the friction plate 27.

[0041] The friction plate 27 can be detachably connected to the second mounting base 26, and the detachable friction plate 27 is easy to replace after wear.

[0042] The aforementioned adjustable resistance structure can be applied to rowing equipment, swimming equipment, and other equipment that uses a rope structure for resistance training.

[0043] Figures 1-3 As shown, preferably, two rope wheels 2 are sleeved on the rotating shaft 13, and both rope wheels 2 are connected to a reset mechanism 48. The reset mechanism 48 is used to drive the rope wheels 2 to rotate and reset. The rope wheels 2 and the rotating shaft 13 are connected by a clutch for one-way transmission.

[0044] When the pull rope 3 is pulled out of the pulley 2 by an external force, the pulley 2 rotates in the forward direction driven by the pulled rope 3. At the same time, the pulley 2 drives the rotating shaft 13 to rotate together through the clutch. When the rotating shaft 13 rotates, the friction wheel 14 and the friction plate 27 come into contact and rub against each other, providing rotational resistance to the rotating shaft 13. The rotating shaft 13 transmits the rotational resistance to the pulley 2. When the pull rope 3 is released, the reset mechanism 48 drives the pulley 2 to rotate in the reverse direction. The pulley 2 retracts the pulled rope 3. At this time, the clutch disconnects the transmission between the pulley 2 and the rotating shaft 13. The rotating shaft 13 does not rotate with the pulley 2. At this time, the friction wheel 14 does not rotate, so the reverse rotation of the pulley 2 is not affected by the frictional resistance between the friction wheel 14 and the friction plate 27.

[0045] The clutch between the rope wheel 2 and the shaft 13 ensures that the friction wheel 14 and the friction assembly 9 do not provide rotational resistance to the rotation of the rope wheel 2 when the rope 3 is released, thus making the rope winding smoother. It also allows the two rope wheels 2 to be set on the same shaft 13 and share a damping structure, reducing costs.

[0046] Working principle: The exerciser holds the two resistance ends of the two ropes 3 with both hands. One hand pulls the rope 3 outward while the other hand releases it. When the rope 3 is pulled out, the damping structure formed by the friction wheel 14 and the friction component 9 provides rotational resistance to the rotating shaft 13. The rotating shaft 13 then transmits the rotational resistance to the rope wheel 2, causing the rope 3 to be resisted, thus achieving strength training. The released rope 3 is pulled back by the reverse rotation of the rope wheel 2. The two hands continuously pull the ropes 3 on both sides to perform strength training, simulating various sports training methods, including simulating the resistance training of swimming and rowing training.

[0047] Preferably, the clutch element is a one-way bearing 15. The one-way bearing 15 is a conventional structure, such as a one-way bearing of the brand muh and model CSK.

[0048] Preferably, the friction wheel 14 is located between the two rope wheels 2.

[0049] The reset mechanism 48 includes an elastic rope 11, a recovery wheel 10 for winding the elastic rope 11, and a guide wheel for guiding the elastic rope 11. The recovery wheel 10 is coaxial with the rope wheel 2 and the two are fixed together. One end of the elastic rope 11 is connected to the recovery wheel 10, and the other end of the elastic rope 11 is connected to the support frame 1. The elastic rope 11 is wound around the guide wheel. The guide wheel tensions the elastic rope 11 and changes the direction of the elastic rope 11. When the pull rope 3 is pulled out from the rope wheel 2, the elastic rope 11 is stretched and wound around the recovery wheel 10 as the recovery wheel 10 rotates. When the pulled rope 3 is released, the elastic rope 11 elastically retracts to drive the recovery wheel 10 and the rope wheel 2 to rotate. The rope wheel 2 retracts the pulled rope 3.

[0050] Since the elasticity of the elastic rope 11 mainly depends on the flexibility and extensibility of the material, the elastic force of the elastic rope 11 drives the recovery wheel 10 to rotate more smoothly and gently. This makes it less likely for the rope wheel 2 to cause strain to the exerciser when retracting the rope 3, resulting in better comfort. Furthermore, the elastic rope 11 will not break due to fatigue, making it safer to use. If it loosens after prolonged use, it is also easier to replace and maintain later. The length and thickness of the elastic rope 11 determine the length to which it can be stretched. The way the elastic rope 11 is stretched and wrapped around the recovery wheel 10 serves as a reset structure, allowing the rope wheel 2 and the recovery wheel 10 to rotate more times. This allows the maximum length of the rope 3 to be set to be longer, thus meeting the needs of simulated swimming and rowing training.

[0051] The recovery wheel 10 is also fitted onto the rotating shaft 13. Preferably, the recovery wheel 10 and the rope wheel 2 are integrally formed. For example, two annular rope grooves are machined on the outer circumferential wall of the cylinder to form the recovery wheel 10 and the rope wheel 2. The recovery wheel 10 and the rope wheel 2 are supported by two one-way bearings 15 between them and the rotating shaft 13.

[0052] The guide wheel includes multiple upper guide wheels 12 and multiple lower guide wheels 17. The upper guide wheels 12 and lower guide wheels 17 are arranged vertically on the support frame 1 and are staggered. The elastic rope 11 is wound vertically and horizontally around the upper guide wheels 12 and lower guide wheels 17. By setting multiple upper guide wheels 12 and lower guide wheels 17, the elastic rope 11 is wound vertically between the upper guide wheels 12 and lower guide wheels 17 to ensure the length of the elastic rope 11, thereby meeting the requirement of the elastic rope 11 being stretched and wound up. The vertical winding method makes the elastic rope 11 more compact and neatly arranged to ensure the smooth stretching and retraction of the elastic rope 11.

[0053] The circumferential surface of the last guide wheel around which the elastic rope 11 passes is opposite to the circumferential surface of the recovery wheel 10, making the recovery wheel 10 rotate more smoothly when winding the elastic rope 11.

[0054] The center lines of the upper guide wheel 12 and the lower guide wheel 17 are parallel to the center lines of the recovery wheel 10 and the rope wheel 2.

[0055] Preferably, there are four upper guide wheels 12, which are coaxially arranged and rotate independently of each other. There are also four lower guide wheels 17, which are coaxially arranged and rotate independently of each other.

[0056] The fixed end of the pull rope 3 is connected to the rope wheel 2, and the force-bearing end of the pull rope 3 is connected to a handle 7, which is used to pull the pull rope 3. The handle 7 and the end of the pull rope 3 are connected by a connecting ring 8.

[0057] The support frame 1 is equipped with two swing frames 4 that swing around a vertical axis. The swing frames 4 can swing left and right. The swing frames 4 are equipped with guide pulleys 5. The force-bearing ends of the pull ropes 3 wound on the rope wheels 2 on both sides pass over the guide pulleys 5 on the two swing frames 4 respectively. When the exerciser holds the handles 7 with both hands to pull the pull ropes 3 on both sides, the swing frames 4 swing left and right with the movement of the hands, making the rope release smoother.

[0058] The swing frame 4 is set on the top of the support frame 1. The bottom of the support frame 1 is provided with fixed pulleys 6 corresponding to the pull ropes 3 on both sides. The pull ropes 3 pass around the fixed pulleys 6 and then around the guide pulleys 5 on the swing frame 4. The fixed pulleys 6 tension the pull ropes 3 and change the direction of the pull ropes 3.

[0059] The swing frame 4, the rotating shaft 13, and the guide wheel are arranged sequentially from front to back.

[0060] The adjustable damping structure provided by this utility model has been described above. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand this utility model and its core ideas. It should be noted that those skilled in the art can make several improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A damping structure with adjustable damping force, comprising a support frame, a rotating shaft rotatably mounted on the support frame, a rope pulley fitted on the rotating shaft, and a pull rope wound on the rope pulley, characterized in that, A friction wheel is fixed on the rotating shaft, and a friction assembly that rubs against the friction wheel is provided on the support frame. The friction assembly includes a left clamp body and a right clamp body, which are pivotally connected by a pivot. The right clamp body has a first clamping end and a first adjusting end. The portion of the right clamp body from the rotation point to the first clamping end serves as a first clamping arm, and the portion from the rotation point to the first adjusting end serves as a first adjusting arm. The left clamp body has a second clamping end and a second adjusting end. The portion of the left clamp body from the rotation point to the second clamping end serves as a second clamping arm. The adjusting end serves as the second adjusting arm. The first clamping end and the second clamping end are opposite each other, and both have contact parts on their inner sides that rub against the friction wheel. The contact parts on the first clamping end and the contact parts on the second clamping end form a clamping opening for the friction wheel to be inserted. The first adjusting end and the second adjusting end are opposite each other. An adjusting screw is connected to the first adjusting end, and a through hole is provided on the second adjusting end for the adjusting screw to pass through. The adjusting screw passes through the through hole and is threadedly connected to the adjusting nut. The width of the clamping opening can be changed by rotating the adjusting nut along the adjusting screw.

2. The damping structure with adjustable damping force according to claim 1, characterized in that, A return spring is provided between the left and right clamps. The return spring acts on the left and right clamps, causing the first clamping end and the second clamping end to have a tendency to open to both sides.

3. The damping structure with adjustable damping force according to claim 1, characterized in that, A mounting base is fixed on the inner side of the first clamping end, and a friction plate is fixed on the mounting base. The friction plate serves as the contact part that comes into contact with the friction wheel.

4. The damping structure with adjustable damping force according to claim 1, characterized in that, A mounting base is fixed on the inner side of the second clamping end, and a friction plate is fixed on the mounting base. The friction plate serves as the contact part that comes into contact with the friction wheel.

5. The damping structure with adjustable damping force according to claim 1, characterized in that, The adjusting nut has at least one raised rotating protrusion on its side wall for the hand to rotate the adjusting nut.

6. The damping structure with adjustable damping force according to claim 1, characterized in that, The adjusting screw is connected to the first adjusting end by a mounting bolt and a first mounting nut. One end of the adjusting screw is fixed with a flat connecting plate. The connecting plate has a first connecting hole for the mounting bolt to pass through. The first adjusting end has a second connecting hole for the mounting bolt to pass through. The mounting bolt passes through the first connecting hole and the second connecting hole and is threadedly connected to the first mounting nut.

7. The damping structure with adjustable damping force according to claim 1, characterized in that, The support frame is provided with mounting holes for mounting a pivot. The pivot includes a shaft and a support column located in the middle of the shaft. The diameter of the support column is larger than the diameter of the shaft. Both the upper and lower ends of the shaft are provided with external threads. The shaft portion located below the support column passes through the mounting hole and the lower end face of the support column abuts against the support frame. The lower end of the shaft passing through the mounting hole is threadedly connected to the lower mounting nut. The left and right clamps are coaxially mounted on the shaft portion above the support column and rotate. The upper end of the shaft is threadedly connected to the upper mounting nut to limit the movement of the left and right clamps.

8. The damping structure with adjustable damping force according to claim 3 or 4, characterized in that, The friction plate is arc-shaped and is used to contact the outer edge of one end face of the friction wheel.

9. The damping structure with adjustable damping force according to claim 1, characterized in that, A gap is provided between the through hole and the adjusting screw that passes through it, allowing the adjusting screw to move within the gap.

10. The damping structure with adjustable damping force according to claim 1, 2, or 7, characterized in that, The left and right clamps are staggered and connected by a pivot. When the adjusting nut is rotated along the adjusting screw and the second adjusting end is pushed closer to the first adjusting end, the clamp width decreases.

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