Water resistance regulating mechanism and rowing machine

Abstract

The present invention relates to the technical field of fitness equipment, and in particular to a water resistance regulating mechanism and a rowing machine. The water resistance regulating mechanism is used on a rowing machine, and includes a machine head and a frame. The machine head is fixed with a water tank, and a rotating shaft is vertically arranged at the center of the water tank. The rotating shaft is connected to a paddle structure located in the water tank, and the rotating shaft drives the paddle structure to rotate. The water tank is connected to a regulator for adjusting the rotational resistance of the rotating shaft. In the present invention, the water resistance regulating mechanism and the rowing machine are provided with a regulator, and the rotational resistance of the rotating shaft is adjusted by the regulator to control the resistance of the rowing machine. The resistance of the pulling hand tube is always the same, and can be balanced, and the range of adjusting the resistance is large.

Description

Technical Field

[0001] The invention relates to the technical field of fitness equipment, in particular to a water resistance regulating mechanism and a rowing machine. Background Art

[0002] The rowing machine is a piece of equipment that simulates rowing exercise. It is good for strengthening the muscles of the legs, waist, upper limbs, chest and back. The exerciser sits on a sliding bench with legs bent, applies force with hands and feet at the same time, straightens the legs, leans back, and rows the arms backward to both sides to simulate rowing.

[0003] Refer to the Chinese utility model patent with authorization announcement number CN206007976U, which discloses an adjustable water resistance device for fitness equipment, belonging to the technical field of fitness equipment, including a box body, a partition plate is arranged horizontally in the box body, and the partition plate divides the box body into an upper chamber and a lower chamber; a rotating shaft is arranged vertically in the center of the box body, and the bottom of the rotating shaft is located in the lower chamber and a plurality of water resistance plates are arranged; an upper water pipe with an upper end surface higher than a section of the partition is arranged near the edge of the partition, and a lower water controller is arranged near the center of the partition. The utility model can adjust the water volume of the water resistance liquid in the lower chamber as needed, thereby controlling the resistance of the fitness equipment.

[0004] See also Figure 1 , a Chinese invention patent with authorization announcement number CN108235688B discloses a water resistance rowing fitness machine, including a bracket, a water tank fixed on the bracket, a linkage mechanism and an angle adjustment mechanism, wherein a first impeller and a second impeller are arranged inside the water tank, wherein the first impeller includes a first plate portion and a plurality of first blades distributed around the first plate portion, and the second impeller includes a second plate portion and a plurality of second blades distributed around the second plate portion; the angle adjustment mechanism is used to adjust the relative rotation angle between the first impeller and the second impeller so that the first blade and the second blade can be close to or away from each other. By adopting the above technical solution, by adjusting the relative rotation angle between the first impeller and the second impeller, the distance between the first blade and the second blade can be adjusted, and then the resistance of the two impellers rotating in the water tank can be adjusted, so as to achieve the effect of adjusting the resistance of the water resistance rowing fitness machine.

[0005] The existing technologies all generate resistance by the water in the water tank, and the adjustment range is limited. When in use, the resistance of pulling the handle (pulling hand tube) is the largest at the beginning, and then the resistance of pulling the handle will become smaller and smaller due to the existence of rotational inertia, so the resistance is uneven. Summary of the invention

[0006] The purpose of the present invention is to provide a water resistance adjustment mechanism and a rowing machine, which can control the resistance of the rowing machine by adjusting the rotational resistance of the rotating shaft, so that the resistance of the pulling hand tube is always the same, and can maintain balance, and the range of adjusting resistance is large.

[0007] In order to achieve the above advantages, the water resistance adjustment mechanism provided by the present invention is used on a rowing machine, including a head and a frame. The head is fixed with a water tank, and a rotating shaft is vertically provided at the center of the water tank. The rotating shaft is connected to a blade structure located in the water tank, and the rotating shaft drives the blade structure to rotate. The water tank is connected to a regulator for adjusting the rotational resistance of the rotating shaft.

[0008] In one embodiment of the present invention, the water tank includes a water tank base and a water tank cover, the water tank base and the water tank cover are sealingly connected, and the water tank base and the water tank cover are respectively provided with a lower tube body and an upper tube body for connecting the rotating shaft; sealing rings are respectively provided between the upper and lower ends of the rotating shaft and the lower tube body and the upper tube body, and the upper and lower ends of the rotating shaft respectively have sealing ring grooves for installing the sealing ring.

[0009] In one embodiment of the present invention, the regulator is a cup-shaped structure, which includes a torsion portion exposed outside the water tank, a plurality of elastic claws evenly arranged around the rotating axis, and a connecting body connecting the torsion portion and the plurality of elastic claws, wherein the circumferential surface of the torsion portion has evenly arranged protrusions, and the protrusions are used to increase friction; the connecting body is provided with an external thread, and the upper tube body is provided with an internal thread matching the external thread.

[0010] In one embodiment of the present invention, the upper tube body further has a conical guide surface located below the internal thread, and the conical guide surface is used to guide the free end of the elastic claw to move toward the center of the water tank to squeeze the circumference of the rotating shaft.

[0011] In one embodiment of the present invention, when the adjuster moves downward, the elastic claw increases the squeezing force on the circumference of the rotating shaft through the conical guide surface, and the rotational resistance encountered by the rotating shaft increases; when the adjuster moves upward, the elastic claw reduces the squeezing force on the circumference of the rotating shaft, and the rotational resistance encountered by the rotating shaft decreases.

[0012] In one embodiment of the present invention, a rotating shaft connecting piece is connected to the lower end of the rotating shaft, and a one-way bearing is provided between the rotating shaft and the rotating shaft connecting piece.

[0013] In one embodiment of the present invention, the rotating shaft and the rotating shaft connecting member are axially fixed.

[0014] In one embodiment of the present invention, the water tank upper cover is provided with a water filling port, and the water tank base is provided with a water discharge port, and the water filling port and the water discharge port are respectively connected to water port plugs.

[0015] In one embodiment of the present invention, the water tank base is further provided with a fixing portion for connecting and fixing with the machine head, and the machine head is provided with a positioning groove corresponding to the fixing portion.

[0016] In one embodiment of the present invention, a rowing machine includes the above-mentioned water resistance adjustment mechanism.

[0017] In the present invention, a water resistance adjustment mechanism and a rowing machine are provided with a regulator, and the resistance of the rowing machine is controlled by adjusting the rotational resistance of the rotating shaft through the regulator. The resistance received by pulling the pulling hand tube is always the same, and can be kept balanced, and the range of adjusting the resistance is large. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Shown is a structural schematic diagram of an existing water resistance rowing fitness machine.

[0019] Figure 2 Shown is a schematic structural diagram of the water resistance adjustment mechanism and the rowing machine of the present invention.

[0020] Figure 3 Shown Figure 2 Front view of a rowing machine.

[0021] Figure 4 Shown Figure 2 Exploded view of a rowing machine.

[0022] Figure 5 Shown Figure 2 Schematic diagram of the structure of the head of a rowing machine.

[0023] Figure 6 Shown Figure 2 A schematic structural diagram of a locking portion and a fixing portion of a rowing machine.

[0024] Figure 7 Shown Figure 2 Schematic diagram of the frame of a rowing machine in a folded position.

[0025] Figure 8 Shown Figure 4 Exploded view of the water tank of a rowing machine.

[0026] Fig. 9 Shown Figure 8 Cross-sectional view of the water tank.

[0027] Fig.10 Shown Figure 8 Schematic diagram of the coordination of the water tank, rotating shaft and regulator.

[0028] Fig.11 Shown Figure 8 Schematic diagram of the structure of the rotating axis of the water tank.

[0029] Fig.12 Shown Figure 8 Schematic diagram of the structure of the regulator connected to the water tank.

[0030] Fig.13 Shown Figure 4 Schematic diagram of the structure of the tension component of the rowing machine.

[0031] Fig.14 Shown Fig.13 Schematic diagram of the exploded view of the limiting wheel and guide wheel of the tension component.

[0032] Fig.15 Shown Fig.13 Schematic diagram of the exploded view of the webbing wheel and reset assembly of the tension assembly.

[0033] Fig.16 Shown Figure 4 Schematic diagram of the structure of the transmission mechanism of the rowing machine. DETAILED DESCRIPTION

[0034] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0035] See also Figure 2-4 The water resistance adjustment mechanism and rowing machine of the first embodiment of the present invention include a machine head 1, a frame 2, a pair of water tanks 3 arranged on the machine head 1, a tension assembly 4 and a transmission mechanism 5. The machine head 1 is hingedly connected to the frame 2, the frame 2 can be rotated upward from a working position to a vertically upward folded position, and the pair of water tanks 3 are respectively located on both sides of the tension assembly 4. For the convenience of description, the side of the machine head 1 is the front end.

[0036] See also Figure 5 The machine head 1 includes a machine head base 11 and a machine head base cover 12. The machine head base 11 and the machine head base cover 12 cooperate to form a storage space. The bottom of the machine head base 11 is fixed with auxiliary wheels 112 arranged toward the front end and a machine head foot pad 111 arranged toward the rear end. When it needs to be moved, the frame 2 can be easily moved by the auxiliary wheels 112 by slightly lifting it. The machine head base 11 is also connected to a pedal structure 113. The pedal structure 113 can be connected to a pedal strap to allow the user to fix his feet for easy force. The machine head base 11 is connected to a plastic cover 115 for shielding the tension component 4 and the transmission mechanism 5.

[0037] See also Figure 3-4The frame 2 includes a folding tube 21, a slide rail fixing tube 23, a tailstock bracket 24, and a cushion 25 which are fixedly connected in sequence. A folding connector 211 is fixed to the end of the folding tube 21. The slide rail fixing tube 23 is slidably connected to the cushion 25. The tailstock bracket 24 is connected to an adjusting foot pad 241, which is convenient for adjusting the height of the tailstock 26 and can support the frame 2 when it is in the working position or the folding position to avoid wear on the surface of the frame 2. The tailstock 26 is sleeved outside the tailstock bracket 24 for easy connection.

[0038] Furthermore, the two sides of the slide rail fixing tube 23 are respectively connected and fixed with slide rails 231, the seat cushion 25 is connected with a seat cushion seat 251, and the front and rear of the seat cushion seat 251 are respectively fixed with sliding wheels 252 that cooperate with the two side slide rails 231. Limiting blocks 232 are respectively provided at both ends of the slide rail 231 to prevent the sliding wheel 252 from detaching from the slide rail 231.

[0039] See also Figure 6 The rowing machine further includes a locking portion 6 and a fixing portion 7. The locking portion 6 is used to limit the rotation of the frame 2 to keep the frame 2 in the working position, and the fixing portion 7 is used to fix the frame 2 rotated to the folded position.

[0040] The locking part 6 includes a folding pin 61 of a columnar structure and a switch 62 for driving the folding pin 61 to move. The switch 62 is fixed to the middle of the folding pin 61. The folding connector 211 has a hinge protrusion 211a, a mounting blind hole A1 for accommodating the folding pin 61, and a slide groove A2 corresponding to the switch 62, and the side wall of the mounting blind hole A1 is connected to the slide groove A2.

[0041] The head base 11 has a connecting portion 116 extending toward the frame 2, and the connecting portion 116 is provided with a hinge groove 116a cooperating with the hinge protrusion 211a, a mounting blind hole B1 accommodating part of the folding pin 61, and a slide groove B2 corresponding to the switch 62, and the side wall of the mounting blind hole B1 is connected to the slide groove B2.

[0042] When the frame 2 is in the working position, the axis of the installation blind hole A1 and the axis of the installation blind hole B1 are located on the same straight line. The hinge protrusion 211a and the hinge groove 116a are respectively provided with corresponding hinge holes 0. The structures of the installation blind hole A1 and the installation blind hole B1, and the slide groove A2 and the slide groove B2 are the same. The connecting surfaces are provided with guide surfaces so that the locking part 6 slides smoothly. The depth of the installation blind hole A1 is deeper than the depth of the installation blind hole B1. The guide surface is chamfered or rounded.

[0043] The fixing part 7 includes a strap 71 and a mounting part 72 for mounting the strap 71. The mounting part 72 is also fixed with a rubber pad 721 for preventing the folding tube 21 from rubbing against the machine head 1. The cross section of the rubber pad 721 is a right-angled trapezoidal structure, and its inclined surface is provided with an arc groove 721a against the side wall of the folding tube 21, so that when the frame 2 is in the folded position, the angle α formed between the frame 2 and the machine head 1 is less than 90°, thereby reducing the force strength of the strap 71.

[0044] See also Figure 2 , Figure 7 , the frame 2 rotates to the working position, the driving switch 62 drives the folding pin 61, so that one end of the folding pin 61 is accommodated in the installation blind hole A1, and the other end is accommodated in the installation blind hole B1, thereby limiting the rotation of the frame 2. When folding is required, the driving switch 62 drives the folding pin 61, so that the folding pin 61 is completely accommodated in the installation blind hole A1, and the frame 2 can be lifted at this time.

[0045] See also Figure 8-11 A pair of water tanks 3 have the same structure. A rotating shaft 31 is vertically arranged at the center of each water tank 3, and the rotating shaft 31 is connected to a paddle structure 32 located in the water tank 3. The tension component 4 drives the rotating shaft 31 to rotate through the transmission mechanism 5.

[0046] The water tank 3 includes a water tank base 33 and a water tank cover 34, which are sealed and connected. The water tank base 33 and the water tank cover 34 are respectively provided with a lower tube body 331 and an upper tube body 341 for connecting the rotating shaft 31, and the upper and lower ends of the rotating shaft 31 are respectively connected to the lower tube body 331 and the upper tube body 341 for sealing rotation.

[0047] Specifically, the upper and lower ends of the rotating shaft 31 are respectively provided with sealing ring grooves 310 for installing sealing rings. The upper tube body 341 is divided into a regulator accommodating portion 341a, a bearing accommodating portion 341b, and a sealing accommodating portion 341c. The insides of the regulator accommodating portion 341a, the bearing accommodating portion 341b, and the sealing accommodating portion 341c are connected in sequence. A fourth bearing 35 is provided between the rotating shaft 31 and the bearing accommodating portion 341b. The sealing accommodating portion 341c corresponds to the sealing ring groove 310.

[0048] The blade structure 32 includes a plurality of blades 321 and a blade fixing frame 322. An insert 322a is provided at the center of the blade fixing frame 322. A connecting thread is provided on the inner surface of the insert 322a. The rotating shaft 31 is fixed to the blade structure 32 through threaded connection. Further, the insert 322a may be a nut.

[0049] In other embodiments of the present invention, the blade fixing frame 322 and the blade 321 may be fixed by bolt connection, so as to facilitate the removal and replacement of the blade 321 .

[0050] The water tank cover 34 is provided with a water inlet 341, and the water tank base 33 is provided with a drain port 342. The water inlet 341 and the drain port 342 are respectively connected with a water inlet plug 343. The water tank base 33 is provided with a water tank fixing portion 332 for connecting and fixing with the machine head 1, and the machine head 1 is provided with a positioning groove 15 corresponding to the water tank fixing portion 332.

[0051] See also Figure 9-10 , Fig.12 The water tank 3 is connected to a regulator 8 for adjusting the rotational resistance of the rotating shaft 31. The regulator 8 includes a torsion portion 81 exposed outside the water tank 3, a plurality of elastic claws 82 uniformly arranged circumferentially around the rotating shaft 31, and a connecting body 83 connecting the torsion portion 81 and the plurality of elastic claws 82. The greater the gripping force of the elastic claws 82 on the rotating shaft 31, the greater the rotational resistance of the rotating shaft 31.

[0052] Specifically, the circumference of the torsion portion 81 has evenly arranged protrusions 811 for increasing friction, which facilitates the user to rotate the torsion portion 81 to adjust the rotation resistance of the rotating shaft 31. The connector 83 is provided with an external thread, and the regulator accommodating portion 341a is provided with an internal thread matching the external thread.

[0053] The regulator accommodating portion 341 a also has a tapered guide surface 341 d located below the internal thread, and the tapered guide surface 341 d is used to guide the free end of the elastic claw 82 to move toward the center of the water tank 3 to press the circumference of the rotating shaft 31 .

[0054] When the regulator 8 moves downward, the elastic claw 82 increases the squeezing force on the circumference of the rotating shaft 31 through the conical guide surface 341d, and the rotation resistance of the rotating shaft 31 increases; when the regulator 8 moves upward, the elastic claw 82 reduces the squeezing force on the circumference of the rotating shaft 31, and the rotation resistance of the rotating shaft 31 decreases. The outer diameter of the protrusion 811 is larger than the inner diameter of the internal thread, so as to prevent the elastic claw 82 from gripping too much and causing the rotating shaft 31 to get stuck or the elastic claw 82 from being overloaded and broken.

[0055] See also Figure 13-15 The tension assembly 4 includes a tension webbing 41, a webbing wheel 42, a webbing wheel shaft 43, a tension hand tube 44, a limit wheel 45, and a guide wheel 46. The axes of the webbing wheel 42, the limit wheel 45, and the guide wheel 46 are parallel to each other. The webbing wheel shaft 43 is rotatably connected to a support seat 48 connected and fixed to the head base 11.

[0056] One end of the tension webbing 41 is connected to the tension hand tube 44, and the other end is connected to the webbing wheel 42 and wound around the webbing wheel 42, and the webbing wheel 42 is sleeved on the webbing wheel shaft 43. A first one-way bearing 402 and a third bearing 403 are provided between the webbing wheel 42 and the webbing wheel shaft 43, and the third bearing 403 is respectively provided on both sides of the first one-way bearing 402. When the user pulls the tension hand tube 44 backward, the webbing wheel 42 drives the webbing wheel shaft 43 to rotate; when the webbing wheel 42 reverses, it does not drive the webbing wheel shaft 43 to rotate.

[0057] The two ends of the pull handle 44 are respectively sleeved with a handle sleeve 441, which is made of rubber or other flexible materials to improve the comfort of the user's grip. The hand head 1 is connected and fixed with a pull handle recovery buckle 16, which has an arc structure 161 corresponding to the side of the pull handle 44.

[0058] The webbing wheel 42 is connected with a reset assembly 9 for rotating the webbing wheel 42 in the direction of winding the tension webbing 41. The reset assembly 9 includes a reset coil spring 91 (not shown), a coil spring shaft 92, and a coil spring box 93. The reset coil spring 91 is wound outside the coil spring shaft 92 and installed in the coil spring box 93. The coil spring shaft 92 is connected and fixed to the webbing wheel 42, and the coil spring box 93 is fixed to the support seat 48. When the user pulls the tension hand tube 44 backward, the webbing wheel 42 drives the coil spring shaft 92 to rotate the reset coil spring 91 to form a contracted state; after stopping pulling, the reset coil spring 91 is reset to drive the webbing wheel 42 to rotate in the opposite direction.

[0059] The limiting wheels 45 are a pair, and the tension webbing 41 passes between the limiting wheel 45 and the other limiting wheel 45. The gap between the limiting wheel 45 and the other limiting wheel 45 is smaller than the width of the tension webbing 41, which can prevent the tension webbing 41 from turning over and winding. At the same time, it can also prevent the tension webbing 41 from detaching from the guide wheel 46 when it is pulled sideways, resulting in a problem that it cannot be wound well. The limiting wheel 45 is fixed to the plastic cover 115 through the limiting wheel frame 451. The two ends of the limiting wheel 45 are respectively sleeved with shaft sleeves 452. The limiting wheel 45 rotates smoothly to avoid excessive friction between the tension webbing 41 and the limiting wheel 45, thereby extending the service life of the tension webbing 41.

[0060] The guide wheel 46 is arranged between the limiting wheel 45 and the webbing wheel 42, and the guide wheel 46 is used to prevent the webbing wheel 42 from winding in the reverse direction when winding the tension webbing 41. The limiting convex ring 421 and the limiting convex ring 461 are respectively arranged at both ends of the webbing wheel 42 and the guide wheel 46, and the limiting convex ring 421 and the limiting convex ring 461 are used to prevent the tension webbing 41 from deflecting. The limiting convex ring 421 and the limiting convex ring 461 have guide surfaces 421a and guide surfaces 461a, and the guide surfaces further prevent the tension webbing 41 from deflecting. The cross-sections of the webbing wheel 42 and the guide wheel 46 are in the shape of an "I".

[0061] Furthermore, the machine head 1 is provided with a fixing tube 17 extending upward for fixing the guide wheel 46 , the fixing tube 17 is connected and fixed with a guide wheel fixing frame 49 , the guide wheel fixing frame 49 is rotatably connected to the guide wheel 46 , and the guide wheel fixing frame 49 is a U-shaped structure.

[0062] See also Fig.16 The transmission mechanism 5 includes: a transmission shaft 51, a rotating shaft connecting member 52, a main synchronous pulley 53, and a secondary synchronous pulley 54.

[0063] The two ends of the transmission shaft 51 are respectively connected and fixed with bevel gears A3. The rotating shaft 31 and the rotating shaft connecting member 52 are axially connected and fixed by a retaining spring, and the rotating shaft 31 is provided with a retaining spring groove 311. The rotating shaft connecting member 52 is connected and fixed with a bevel gear B3. A second bearing 56 is provided between the rotating shaft connecting member 52 and the water tank fixing portion 332. A second one-way bearing 57 is provided between the rotating shaft connecting member 52 and the rotating shaft 31. The bevel gear A3 and the bevel gear B3 are meshed with each other. The head base 11 is provided with an opening 117 corresponding to the rotating shaft connecting member 52, and the radial dimension of the opening 117 is larger than the outer diameter dimension of the rotating shaft connecting member 52 and smaller than the outer diameter dimension of the second bearing 56.

[0064] The primary and secondary synchronous pulleys 54 are respectively fixed on the transmission shaft 51 and the webbing wheel shaft 43 of the tension component 4. The transmission shaft 51 is parallel to the axis of the webbing wheel shaft 43. The user pulls the tension hand tube 44 of the tension component 4 to drive the webbing wheel shaft 43 to drive the transmission shaft 51 to rotate, and the transmission shaft 51 drives a pair of paddle structures 32 in the water tank 3 to rotate synchronously.

[0065] The transmission mechanism 5 further includes a bearing seat 58 for fixing the transmission shaft 51, the bearing seat 58 is connected and fixed to the head base 11, and a first bearing 59 is provided between the bearing seat 58 and the transmission shaft 51. The transmission shaft 51 is accommodated in an accommodating space formed by the head base 11 and the head base cover 12.

[0066] Furthermore, the fourth bearing 35 , the third bearing 403 , the second bearing 56 , and the first bearing 59 are all deep groove ball bearings.

[0067] How a rowing machine works:

[0068] When exercising, the user pulls the tension hand tube backwards and pulls out the tension webbing wrapped around the webbing wheel through the limit wheel and the guide wheel. The webbing wheel is driven to rotate, and the webbing wheel shaft also rotates. The webbing wheel shaft drives the transmission shaft to rotate through the main and auxiliary synchronous pulleys. The transmission shaft drives the rotating shafts in the water tanks on both sides through the mutually meshing bevel teeth A and bevel teeth B to drive the blade structure to rotate.

[0069] When the user loosens the tension hand tube, the tension webbing is also wound back onto the webbing wheel due to the restoring elastic force of the return coil spring. By virtue of the above components, the user can repeatedly pull the tension hand tube to generate a damping tension to achieve the purpose of stretching exercise.

[0070] The rotational resistance of the rotating shaft can be adjusted by the regulator to meet the exercise intensity requirements of different users.

[0071] In the present invention, a water resistance adjustment mechanism and a rowing machine are provided with a regulator, and the resistance of the rowing machine is controlled by adjusting the rotational resistance of the rotating shaft through the regulator. The resistance received by pulling the pulling hand tube is always the same, and can be kept balanced, and the range of adjusting the resistance is large.

[0072] In the present invention, the rowing machine is provided with a pair of water tanks, each of which is small in size, and the pull rope assembly is located between the two water tanks, thereby reducing the overall space occupied by the rowing machine head; and the water tanks are placed vertically, so that the water resistance of the paddle blade structure is uniform relative to that of the horizontally placed water tanks.

[0073] In the present invention, the frame and the head of the rowing machine are hinged, and when the rowing machine needs to be stored, the user only needs to lift the frame part, and because there is no need to flip the head, it is more labor-saving.

[0074] In the present invention, the rowing machine is provided with a rubber pad to prevent the folding tube wall from being worn when the frame is in the folded position; the cross-section of the rubber pad is a right-angled trapezoidal structure, and its inclined surface is provided with an arc groove that abuts against the side wall of the folding tube, and the angle α formed between the rubber pad and the machine head is less than 90°, thereby reducing the force strength of the strap.

[0075] In the present invention, the rotating shafts in the two water tanks are driven to rotate by the same transmission shaft, so that the two rotating shafts are subjected to the same rotational resistance and the same rotational speed, thereby achieving a balancing effect.

[0076] In the present invention, the limiting wheel provided in the tension assembly can ensure that the tension webbing is wound around the webbing wheel through the guide wheel without deviation, and the distance between the limiting wheel and another limiting wheel is smaller than the width of the tension webbing, which can also prevent the tension webbing from flipping and winding.

[0077] In the present invention, the guide wheel of the tension assembly is arranged between the limiting wheel and the webbing wheel, so as to prevent the webbing wheel from rotating in the opposite direction and winding the tension webbing when the tension webbing is wound back onto the webbing wheel.

[0078] In the present invention, a first one-way bearing is arranged between the webbing wheel of the tension component and the webbing wheel shaft. When the user relaxes the tension hand tube, the webbing wheel is reversed by the force of the reset component, and the webbing wheel shaft is not driven to rotate at this time. That is, the reset component only needs to drive the force of the webbing wheel to reverse to complete the winding of the tension webbing, and the reset spring of the reset component can select a smaller torque.

[0079] In the present invention, the frame is formed by the folding tube, the slide rail fixing tube and the tailstock bracket being connected to each other in sockets and splices, so it is convenient to disassemble; after disassembly, it is packed and transported, which reduces the space occupied by transportation and reduces the transportation cost.

[0080] In the present invention, the blade structure in the water tank is simple in structure and easy to process and produce.

[0081] In one embodiment of the present invention, the blades of the paddle structure are detachably connected to the blade fixing frame, so that replacement is convenient, and only one blade can be replaced.

[0082] The above-described embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or changes made by those skilled in the art based on the present invention are within the protection scope of the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. A water resistance adjustment mechanism for a rowing machine, comprising a machine head and a frame, wherein a water tank is fixed to the machine head, a rotating shaft is vertically arranged at the center of the water tank, the rotating shaft is connected to a blade structure located in the water tank, and the rotating shaft drives the blade structure to rotate, characterized in that: The water tank is connected to a regulator for adjusting the rotational resistance of the rotating shaft; The water tank comprises a water tank base and a water tank upper cover, the water tank base and the water tank upper cover are sealed and connected, the water tank base and the water tank upper cover are respectively provided with a lower tube body and an upper tube body for connecting the rotating shaft; sealing rings are respectively provided between the upper and lower ends of the rotating shaft and the lower tube body and the upper tube body, and the upper and lower ends of the rotating shaft are respectively provided with sealing ring grooves for installing the sealing rings; The regulator is a cup-shaped structure, which includes a torsion portion exposed outside the water tank, a plurality of elastic claws evenly arranged around the rotating axis, and a connecting body connecting the torsion portion and the plurality of elastic claws, wherein the circumferential surface of the torsion portion has evenly arranged protrusions, which are used to increase friction; the connecting body is provided with an external thread, and the upper tube body is provided with an internal thread matching the external thread.

2. The water resistance adjustment mechanism according to claim 1, characterized in that: The upper tube body also has a conical guide surface located below the internal thread, and the conical guide surface is used to guide the free end of the elastic claw to move toward the center of the water tank to squeeze the circumference of the rotating shaft.

3. The water resistance adjustment mechanism according to claim 2, characterized in that: When the regulator moves downward, the elastic claw increases the squeezing force on the circumference of the rotating shaft through the conical guide surface, and the rotational resistance of the rotating shaft increases; when the regulator moves upward, the elastic claw reduces the squeezing force on the circumference of the rotating shaft, and the rotational resistance of the rotating shaft decreases.

4. The water resistance adjustment mechanism according to claim 1, characterized in that: The lower end of the rotating shaft is connected with a rotating shaft connecting piece, and a one-way bearing is arranged between the rotating shaft and the rotating shaft connecting piece.

5. The water resistance adjustment mechanism according to claim 4, characterized in that: The rotating shaft is axially fixed to the rotating shaft connecting member.

6. The water resistance adjustment mechanism according to claim 1, characterized in that: The water tank upper cover is provided with a water inlet, and the water tank base is provided with a water outlet. The water inlet and the water outlet are respectively connected with water outlet plugs.

7. The water resistance adjustment mechanism according to claim 1, characterized in that: The water tank base is also provided with a fixing portion for connecting and fixing with the machine head, and the machine head is provided with a positioning groove corresponding to the fixing portion.

8. A rowing machine, characterized in that: It comprises the water resistance regulating mechanism as described in any one of claims 1-7.

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