A water tank structure of a rowing machine with variable resistance

Abstract

The utility model provides a kind of rowing machine water tank structure with variable resistance, including water tank main body;Water paddle assembly, including rotating support and paddle unit, paddle unit includes a blade and sliding part;Pulling rope assembly, it is located water tank main body outside and is connected with rotating support transmission;Adjusting assembly, including guide, adjusting seat, elastic member and linkage, guide is located in water tank main body, one end of linkage is connected with adjusting seat transmission, the outside of adjusting seat is equipped with connecting sleeve;Connecting piece, its both ends are respectively hinged in the end of sliding part and the outside of connecting sleeve, the utility model controls adjusting seat to be in different height positions by linkage, and then utilize connecting piece to drive paddle unit to slide along the radial of rotating support telescopic, finally make the blade of paddle unit obtain different rotating radius, to change the size of the agitated water resistance it generates, so that the user of different training stages can flexibly configure suitable resistance intensity according to own needs.

Description

Technical Field

[0001] This utility model relates to the technical field of fitness equipment, and in particular to a rowing machine water tank structure with variable resistance. Background Technology

[0002] Rowing machines, as a type of full-body fitness equipment that simulates rowing on water, work by having the user pull a rope to rotate the paddles in the tank. The interaction between the paddles and the water creates resistance, allowing for the complete contraction and extension of the muscles in the upper limbs, lower limbs, waist, abdomen, and back during a single exercise cycle. This results in a comprehensive workout for all the muscles in the body and is widely favored by users with different training needs.

[0003] The resistance adjustment of existing rowing machines mainly relies on the interaction between the paddle and the water, and there are two specific adjustment methods: One method is to adjust the basic resistance value of the water body to the water jet by changing the water volume in the tank. Secondly, by adjusting the pulling force applied by the trainee to the rope, the rotation speed of the paddle is changed, thereby adjusting the real-time resistance sensation.

[0004] However, the paddles in existing rowing machine water tanks generally adopt a fixed blade structure, with fixed blade shape and installation angle, which limits the adjustment of water resistance to only the two methods mentioned above.

[0005] In practical use, this fixed-structure water jet has obvious shortcomings: Because resistance adjustment relies on adjusting the water volume and the trainee's own pulling force, it is impossible to adjust the water resistance precisely and flexibly independently of the water volume and pulling force. For users at different training stages, such as beginners, intermediate trainees, and professional trainees, it is difficult to flexibly match the appropriate resistance intensity according to their own muscle strength and training goals (such as endurance training and strength training).

[0006] In summary, the existing fixed-blade paddle design results in poor flexibility and adaptability in rowing machine resistance adjustment, which limits the improvement of training effect and makes it difficult to meet the personalized training needs of different users.

[0007] In view of this, the inventors specifically designed a rowing machine water tank structure with variable resistance, which led to this invention. Utility Model Content

[0008] To solve the above problems, the technical solution of this utility model is as follows: A variable-resistance rowing machine tank structure, comprising: The main body of the water tank has an axial direction in its middle section; The water propeller assembly, located inside the water tank body, includes a rotating bracket having a circumferentially rotatably connected shell to one axial side of the water tank body, and propeller units circumferentially distributed around the rotating bracket. The propeller unit includes a blade and a sliding part that is radially slidably connected along the rotating bracket. The pull rope assembly is located on the outside of the water tank body and is connected to the rotating bracket for transmission. It is used to drive the rotating bracket and the blade unit to rotate synchronously to generate agitation water resistance. The adjustment assembly includes a guide extending along the axial direction of the water tank body, an adjustment seat that slides in the direction of extension of the guide, an elastic element, and a linkage element. The guide is located inside the water tank body on the opposite side of the water paddle assembly. The elastic element is used to keep the adjustment seat moving towards the water paddle assembly. One end of the linkage element is connected to the adjustment seat and the other end extends to the outside of the water tank body. The outside of the adjustment seat is provided with a connecting sleeve that rotates coaxially with the axial direction of the water tank body and is axially limited. The connector has its two ends hinged to the end of the sliding part and the outside of the connecting sleeve, respectively.

[0009] Preferably, the rotating bracket is provided with a mounting groove that slides with the sliding part along its radial direction, and the mounting groove is provided with a limiting structure for limiting the movement of the blade unit along the radial direction of the rotating bracket.

[0010] Preferably, the limiting structure is provided in two sets at the front and rear positions along the extension direction of the mounting groove.

[0011] Preferably, the blade unit has at least three blades and is evenly distributed around the rotating support in the circumferential direction.

[0012] Preferably, the guide includes at least two guide units distributed around the same circumference, the bottom of the guide units is connected to the same limiting base, the adjusting seat has guide grooves that are the same number as the guide units and are opposite in position along its axial direction, the guide grooves are slidably engaged with the guide units, and the limiting base is used to stop the adjusting seat as a sliding boundary of the adjusting seat.

[0013] Preferably, the adjusting seat includes a top plate, a spindle protruding to one side along the center of the top plate, and a limiting sleeve disposed at the end of the spindle away from the top plate. The limiting sleeve, the outer periphery of the spindle, and the top plate enclose each other to form a rotating groove, and the connecting sleeve is rotatably embedded in the rotating groove.

[0014] Preferably, the outer periphery of the connecting sleeve is provided with connecting ears that are one-to-one with the connecting members, the connecting ears are provided with hinge holes, and the end of the connecting member is pivotally connected to the hinge hole.

[0015] Preferably, the elastic element is a first spring, which is sleeved on the outer periphery of several guide units and its upper and lower ends respectively move to abut against the inner surface of the water tank body and the end face of the adjustment seat.

[0016] Preferably, the linkage is an adjusting rope, one end of which is detachably fixed to the adjusting seat and the other end of which extends through the axial direction of the water tank body to the outside of the water tank body.

[0017] Preferably, it further includes a gear adjustment mechanism, which includes a base plate, an adjustment handle, and an adjustment component. The base plate has a mounting hole, and support plates protrude from both sides of the mounting hole. The middle part of the adjustment handle is rotatably disposed between the two support plates, and its upper and lower ends are respectively located on different sides of the mounting hole. One of the support plates has a plurality of gear slots distributed circumferentially along the rotation axis of the adjustment handle. The end of the adjustment rope is disposed at the end of the adjustment handle. The adjustment component is limited and cooperates with the plurality of gear slots to make the adjustment rope be in different pulling positions.

[0018] The beneficial effects of this utility model are as follows: This invention controls the adjusting seat to different height positions through a linkage component, and then uses a connecting component to drive the blade unit to slide and extend radially along the rotating support, ultimately allowing the blades of the blade unit to obtain different rotation radii, thereby changing the magnitude of the agitation water resistance generated, so that users at different training stages can flexibly configure the appropriate resistance intensity according to their own needs.

[0019] This invention uses a linkage to drive the adjustment seat to slide along the guide, and with the help of the connecting parts, it drives each blade unit to slide radially along the rotating bracket, thereby achieving multi-level adjustment of the blade rotation radius. This allows the blades of the blade unit to obtain different rotation radii, changing the magnitude of the water agitation resistance, so that users at different training stages can flexibly configure the appropriate resistance intensity according to their own needs.

[0020] In addition, by setting up a gear adjustment mechanism, users can easily lock the adjustment rope into different gear slots by operating the adjustment handle and the limit cooperation of the adjustment component, so as to achieve rapid switching and stable locking of resistance without complicated operation or stopping the machine for adjustment; at the same time, the elastic component always provides a reset force for the adjustment seat, ensuring that the adjustment process is smooth and the reset is reliable, reducing the user's operation threshold and improving the convenience and continuity of the training process.

[0021] In addition, the guide component adopts multiple sets of surrounding guide units that slide and engage with the guide groove of the adjustment seat, and with the boundary limitation of the limiting base, it ensures that the sliding process of the adjustment seat is smooth and without deviation, and avoids the blade extension and retraction jamming.

[0022] In addition, the connecting sleeve rotates with the adjusting seat through the rotating groove, so that the force direction of the connecting part when the blade unit rotates is adaptively matched with the rotation direction of the connecting sleeve, thereby reducing transmission wear and improving the service life of the structure.

[0023] In addition, the blade units are evenly distributed and limited by the mounting groove and the limiting structure, which ensures strong synchronization of blade extension and contraction, uniform water resistance, and avoids structural deformation caused by excessive force on one side.

[0024] In particular, the adjustment components, connectors and gear adjustment mechanism are all modularly designed. The guides, elastic components and adjustment seats are integrated inside the main body of the water tank. The gear adjustment mechanism is external and compact. The overall structure is compact and does not require additional training space. At the same time, it simplifies the internal structure of the water tank and reduces assembly difficulty and production costs. Attached Figure Description

[0025] The accompanying drawings, which are provided to further illustrate the present invention and constitute a part of the present invention, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.

[0026] in: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a three-dimensional structural schematic diagram of the present invention; Figure 3 This is one of the schematic diagrams of a partial explosion structure of this utility model; Figure 4 This is the second schematic diagram of the partial explosion structure of this utility model; Figure 5 This is one of the partial exploded structural diagrams highlighting the rotating support in this utility model; Figure 6 This is the second part of the exploded structural diagram of the rotating bracket in this utility model; Figure 7 This is a cross-sectional structural schematic diagram of the present invention; Figure 8 This is a three-dimensional structural diagram highlighting the adjustment component in this utility model; Figure 9 This is a three-dimensional and exploded structural diagram highlighting the adjustment component in this utility model; Figure 10 This is a partial exploded view of the guide component in this utility model; Figure 11 This is a partial exploded view of the adjusting seat in this utility model; Figure 12 This is a partial exploded and cross-sectional structural diagram highlighting the adjustment seat in this utility model; Figure 13 This is a partial top view of the adjustment seat in this utility model; Figure 14This is a partial exploded view of the connecting parts in this utility model; Figure 15 This is a partial structural schematic diagram highlighting the gear adjustment mechanism in this utility model; Figure 16 This is a partial cross-sectional view and exploded structural diagram of the gear adjustment mechanism in this utility model.

[0027] Label Explanation: 100. Water tank body; 110. Upper shell; 120. Lower shell; 200. Water paddle assembly; 300. Pull rope assembly; 310. Drive shaft; 400. Adjustment assembly; 410. Guide component; 411. Guide unit; 412. Limiting base; 413. Hook; 414. Snap-on groove; 420. Adjustment seat; 421. Guide groove; 422. Top plate; 423. Mandrel; 424. Limiting sleeve; 425. Rotating groove; 426. External thread section; 430. Elastic component; 440. Linkage component; 450. Connecting sleeve; 451. Rotating hole; 452. Snap-on groove; 460. Connecting ear; 461. Third pivot hole; 462. Snap-on part; 500. Connecting component; 510. First connecting section; 520. Second connecting section; 5 21. Connecting piece; 522. Fourth pivot hole; 600. Rotating bracket; 610. Central turntable; 620. Connecting ring; 630. Mounting groove; 640. First sliding groove; 650. Connecting plate; 651. Second pivot hole; 700. Blade unit; 710. Blade; 711. Second sliding groove; 720. Sliding part; 721. First pivot hole; 800. Gear adjustment mechanism; 810. Base plate; 811. Mounting hole; 812. Support piece; 813. Gear groove; 820. Adjusting handle; 821. Mounting cavity; 822. Mounting plate; 823. Snap-fit ​​hole; 830. Adjusting component; 831. Linkage piece; 832. Button; 833. Second spring; 834. Hinge rod; 835. Card; 840. Guide wheel. Detailed Implementation

[0028] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0029] Please see Figures 1 to 16 This is a preferred embodiment of a variable resistance rowing machine water tank structure, comprising a water tank body 100, a paddle assembly 200, a rope assembly 300, an adjustment assembly 400, and a connector 500, as detailed below: like Figure 2 , 3As shown, the water tank body 100 includes an upper shell 110 and a lower shell 120. The upper shell 110 and the lower shell 120 are joined together by a sealing connector 500 to form a hollow shell structure with a circular outer perimeter and an axial direction distributed longitudinally in the middle. Based on this, the subsequent structure is developed as follows: First, such as Figure 4-6 As shown, the water propeller assembly 200 is installed inside the water tank body 100 and includes a rotating bracket 600 that is circumferentially connected to a housing on one axial side of the water tank body 100 and three propeller units 700 that are circumferentially distributed around the rotating bracket 600. Each propeller unit 700 includes a blade 710 and a sliding part 720 that is radially slidably connected to the rotating bracket 600.

[0030] In this embodiment, the rotating bracket 600 consists of a central turntable 610 located in the middle and connecting rings 620 located on the outer periphery of the central turntable 610 with a certain interval. Three straight mounting grooves 630 are provided extending from the inside to the outside along the radial direction of the central turntable 610. The mounting grooves 630 extend to the connecting rings 620 and break the entire connecting rings 620 into three segments. The three mounting grooves 630 are evenly distributed around the central turntable 610 with equal intervals (i.e., the included angle between them is 120°).

[0031] Furthermore, first sliding grooves 640 are symmetrically formed on both side walls of the mounting groove 630, extending along the direction of the mounting groove 630 and penetrating the side walls of the mounting groove 630, with the first sliding grooves 640 serving as the guide base for the sliding part 720 of the blade unit 700.

[0032] Specifically, the sliding part 720 is in the shape of a straight rod, and its end away from the blade 710 forms a first pivot hole 721 that extends laterally. When the sliding part 720 is placed in the mounting groove 630, the height of the first pivot hole 721 relative to the bottom of the mounting groove 630 makes it exactly opposite to the first sliding groove 640. At this time, a first connecting shaft (not shown in the figure) that matches the diameter of the first pivot hole 721 is used to pass through both sides of the first pivot hole 721, and its two ends pass out of the first sliding grooves 640 on both sides, thereby restricting the sliding part 720 to slide linearly within the mounting groove 630 and preventing it from coming out of the mounting groove 630 longitudinally. In order to enhance its guiding and limiting effect, the upper and lower widths of the first sliding groove 640 can be further designed to match the outer diameter of the first connecting shaft.

[0033] At this time, under the constraint of the first connecting shaft and the first sliding groove 640, the sliding part 720 can slide along the extension direction of the mounting groove 630, but there is still a certain amount of room for movement in the circumferential direction of the first connecting shaft. Therefore, a connecting plate 650 is further provided on the connecting ring 620 and on one side of the mounting groove 630. A second pivot hole 651 is opened through the connecting plate 650, and a second sliding groove 711 extending in the same direction as the extension direction of the mounting groove 630 is opened on the side of the blade 710 facing the connecting plate 650. At this time, the second connecting shaft (not shown in the figure) is used to connect the blade 710. The shaft passes through the second pivot hole 651 and into the second sliding groove 711, thus forming a sliding restriction on the blade 710, allowing it to slide only along the extension direction of the second sliding groove 711. This, in conjunction with the limiting structure on the first sliding groove 640, forms a double limiting point, enabling the entire blade unit 700 to slide stably in the extension direction of the mounting groove 630. Similarly, the upper and lower width limits of the second sliding groove 711 are designed to match the outer diameter of the second connecting shaft, thereby enhancing its guiding and limiting effect. Based on this, the position of the blade 710 is changed in conjunction with the adjusting component 400.

[0034] Thus, the above structure forms two sets of limiting structures for the radial movement of the limiting blade unit 700 along the rotating support 600.

[0035] like Figure 7 As shown, the rope assembly 300 is located on the outside of the water tank body 100 and is connected to the rotating bracket 600 for transmission. It is used to drive the rotating bracket 600 and the blade unit 700 to rotate synchronously to generate agitation resistance.

[0036] In this embodiment, the pull rope assembly 300 is a common component in the rowing machine field. The pull rope (not shown in the figure) is led out through a corresponding guide wheel set and connected to the handle for the user to pull. The other end of the pull rope is connected to the drive shaft 310 coaxial with the rotating bracket 600, converting the tension of the pull rope into the rotational force of the drive shaft 310. The rotating bracket 600 is coaxially rotatably connected to the drive shaft 310, ultimately converting the tension of the pull rope into the power to drive the rotating bracket 600 to rotate. The rotating bracket 600 drives the blade 710 to rotate, agitating the resistance liquid inside the water tank body 100, thereby generating corresponding water resistance.

[0037] Furthermore, such as Figure 8 , 9 As shown, the adjustment assembly 400 includes a guide member 410 extending axially along the water tank body 100, an adjustment seat 420 slidingly engaged with the extending direction of the guide member 410, an elastic member 430, and a linkage member 440 (connected to the water tank body 100). Figure 4The guide member 410 is located inside the water tank body 100 on the opposite side of the water paddle assembly 200. The elastic member 430 is used to keep the adjusting seat 420 moving towards the water paddle assembly 200. One end of the linkage member 440 is connected to the adjusting seat 420 and the other end extends to the outside of the water tank body 100. The outer side of the adjusting seat 420 is provided with a connecting sleeve 450 that rotates coaxially with the water tank body 100 and is axially limited.

[0038] Specifically, such as Figure 10 As shown, the guide member 410 includes at least two guide units 411 distributed around the same circumference. The bottom of the guide unit 411 is connected to the same limiting base 412. The adjusting seat 420 has guide grooves 421 that are the same number as the guide units 411 and are opposite in position along its axial direction. The guide grooves 421 are slidably engaged with the guide units 411. The limiting base 412 is used to stop the adjusting seat 420 as a sliding boundary of the adjusting seat 420.

[0039] In this embodiment, the limiting base 412 is disc-shaped, and the guide unit 411 is sheet-shaped and bent along its length direction centerline to form an arc plate. The circumferential trajectory corresponding to the arc of the bend is concentric with the limiting base 412. In addition, in order to realize the connection between the guide unit 411 and the limiting base 412, the bottom of the guide unit 411 is provided with a hook 413. The limiting base 412 is provided with a snap-fit ​​groove 414 that engages with the hook 413. In order to enhance the stability of the connection, the number of hooks 413 on the same guide unit 411 can be set to two, and the hooks of the hooks 413 face opposite directions. The two guide units 411 are symmetrically distributed in the radial direction of the limiting base 412, and the snap-fit ​​groove 414 is also symmetrically distributed in the radial direction of the limiting base 412.

[0040] Thus, through the above structure, the two guide units 411 can be used to slide and guide the adjustment seat 420, and at the same time, the hollow part formed between the two guide units 411 can be used to make way for the linkage 440, so that the linkage 440 can use the space to connect and pull with the adjustment seat 420.

[0041] Furthermore, such as Figure 11 , 12 As shown in Figure 13, the adjusting seat 420 includes a top plate 422, a spindle 423 protruding to one side along the center of the top plate 422, and a limiting sleeve 424 located at the end of the spindle 423 away from the top plate 422. The limiting sleeve 424, the outer periphery of the spindle 423, and the top plate 422 enclose each other to form a rotating groove 425, and the connecting sleeve 450 is rotatably embedded in the rotating groove 425.

[0042] In this embodiment, the top plate 422 is disc-shaped, and the spindle 423 extends vertically along the center of the top plate 422 to one side. The spindle 423 is columnar in shape, and the outer diameter of the spindle 423 is smaller than the outer diameter of the top plate 422.

[0043] In addition, in order to achieve a sliding connection with the guide unit 411, two guide grooves 421 that are adapted to the cross section of the guide unit 411 are formed through the axial direction of the top plate 422. The guide grooves 421 are also radially symmetrically distributed about the top plate 422 and extend integrally to the bottom of the outer wall of the mandrel 423.

[0044] In this embodiment, the limiting sleeve 424 is a nut, and the outer peripheral side of the spindle 423 and near the bottom is provided with an external thread section 426 that is threaded with the nut. The nut is threaded and locked onto the external thread section 426. At this time, the nut and the top plate 422 limit the outer side of the spindle 423 into a ring-shaped rotating groove 425, and the connecting sleeve 450 is rotatably sleeved on the rotating groove 425.

[0045] Furthermore, such as Figure 12 , 13 As shown, the connecting sleeve 450 is cylindrical, and a rotating hole 451 is formed on its inner side to rotate and fit into the rotating groove 425. Three connecting ears 460 are evenly distributed around the outer periphery of the connecting sleeve 450, and a third pivot hole 461 (i.e., hinge hole) is opened through the connecting ears 460.

[0046] In addition, the connecting ear 460 and the connecting sleeve 450 can also be designed to be detachably connected. In this embodiment, the end of the connecting ear 460 forms a T-shaped snap-fit ​​portion 462. The outer periphery of the connecting sleeve 450 is provided with a snap-fit ​​groove 452 that extends downward along its top and penetrates its outer periphery sidewall. By inserting the snap-fit ​​portion 462 of the connecting ear 460 into the snap-fit ​​groove 452, the connecting ear 460 can be fixed. At the same time, the top of the snap-fit ​​portion 462 can be further limited by the lower end face of the top plate 422 to prevent it from coming out.

[0047] like Figure 8 , 9 As shown, the elastic element 430 is a first spring. The first spring is sleeved on the outer circumference of the two guide units 411 and its upper and lower ends respectively move to abut against the inner surface of the upper housing 110 and the end face of the top plate 422. Thus, the first spring can generate a certain elastic pressure on the top plate 422, so that it always has a tendency to move in the direction of the blade unit 700.

[0048] Based on this, the two ends of the connector 500 are respectively hinged to the end of the sliding part 720 and the outside of the connecting sleeve 450.

[0049] In this embodiment, as Figure 14As shown, the connector 500 is rod-shaped and includes a horizontally extending first connecting segment 510 and an inclined extending second connecting segment 520, with the second connecting segment 520 extending integrally along one end of the first connecting segment 510.

[0050] The end of the second connecting segment 520 extends outward integrally to form two parallel connecting pieces 521. A hollow area adapted to the thickness of the connecting ear 460 is formed between the two connecting pieces 521. A fourth pivot hole 522 adapted to the third pivot hole 461 is opened through the two connecting pieces 521, so that the end of the second connecting segment 520 can be pivotally connected to the connecting ear 460 at the corresponding position.

[0051] To simplify the structure, a hollow area adapted to the thickness of the first connecting section 510 is formed by recessing the sliding part 720 at the end away from the blade 710. A fifth pivot hole (not shown in the figure) corresponding to the first pivot hole 721 is opened through the first connecting section 510, so that the hinge between the first connecting section 510 and the sliding part 720 can be realized simultaneously using the first connecting shaft.

[0052] Thus, by utilizing the horizontal extension of the first connecting section 510, it can move smoothly within the mounting groove 630, and by utilizing the inclined extension of the second connecting section 520, it can be smoothly connected to the connecting ear 460. When the adjusting seat 420 slides up and down along the guide member 410, the connecting member 500 can drive the blade unit 700 to extend and retract along the mounting groove 630, thereby adjusting the stirring radius of the blade 710 and changing the magnitude of the water resistance it generates.

[0053] Furthermore, such as Figure 15 , 16 As shown, in order to control the adjusting seat 420, the linkage 440 is an adjusting rope. One end of the adjusting rope is detachably fixed to the adjusting seat 420 and the other end extends through the axial direction of the water tank body 100 to the outside of the water tank body 100.

[0054] Specifically, it also includes a gear adjustment mechanism 800, which includes a base plate 810, an adjustment handle 820, and an adjustment member 830. The base plate 810 has a mounting hole 811, and support plates 812 protrude from both sides of the mounting hole 811. The middle part of the adjustment handle 820 is rotatably disposed between the two support plates 812, and its upper and lower ends are respectively located on different sides of the mounting hole 811. One of the support plates 812 has a plurality of gear grooves 813 distributed circumferentially along the rotation axis of the adjustment handle 820. The end of the adjustment rope is disposed at the end of the adjustment handle 820. The adjustment member 830 is limited and cooperates with the plurality of gear grooves 813 to make the adjustment rope in different pulling positions.

[0055] In this embodiment, the base plate 810 is generally used to lock onto the frame of the rowing machine. After the linkage 440 is led out of the water tank body 100, it can be moved to the position of the base plate 810 and connected to the adjustment handle 820.

[0056] In this embodiment, the substrate 810 is a square plate with a square mounting hole 811 in its middle. The adjustment handle 820 is T-shaped and has a hollow mounting cavity 821 inside. A pair of support plates 812 are provided on the same side as the mounting hole 811. One of the support plates 812 is semi-circular and has several stop grooves 813 around its circumference. The lower end of the adjustment handle 820 passes through the mounting hole 811, and its middle part is hinged to the two support plates 812 through a quick-release shaft (not shown in the figure). This allows the adjustment handle 820 to be pushed back and forth on the substrate 810 to change the position of its bottom.

[0057] Based on this, the bottom of the adjusting handle 820 is provided with an installation plate 822. One end of the adjusting rope is clamped to the installation plate 822, and the other end is introduced into the water tank body 100 through several guide wheels 840 and along the axial upper end of the water body in the water tank. After passing through the hollow part of the guide member 410, it is clamped and connected to the adjusting seat 420. Thus, by pushing the adjusting handle 820, the position of the installation plate 822 can be changed, thereby pulling the adjusting rope to move or releasing the tension on the adjusting rope, so that it is pulled back to its original position with the adjusting seat 420 under the action of the first spring.

[0058] Furthermore, such as Figure 16 As shown, the adjusting component 830 includes a linkage plate 831, a button 832, and a second spring 833. The linkage plate 831 is elongated and vertically distributed along the interior of the adjusting handle 820. Its middle part is pivotally connected to the adjusting handle 820 via a hinge rod 834. The top of the linkage plate 831 extends to the horizontal portion of the adjusting handle 820. The button 832 is slidably mounted to one end of the horizontal portion of the adjusting handle 820 and is in a pressable state. The inner side of the button 832 is in movable contact with the linkage plate 831. The second spring 833 is installed inside the other end of the horizontal portion of the adjusting handle 820. The end of the second spring 833 movably abuts against the linkage plate 831, thereby, under the action of the second spring 833, the adjustment handle is pushed... The linkage plate 831 swings to one side. At this time, the button 832 is also in a state of protruding from the adjustment handle 820 under the action of the second spring 833. The lower end of the linkage plate 831 swings to the side wall of the adjustment handle 820, further opening the side wall of the adjustment handle 820 to form a snap-fit ​​hole 823. At the corresponding position of the linkage plate 831, a card 835 protrudes. At this time, the card 835 is protruding from the snap-fit ​​hole 823 and extends to the outside. By designing the protruding position of the card 835 to be in a position corresponding to the gear slot 813, the card 835 can be snapped into the gear slot 813, thereby fixing the angle of the adjustment handle 820. At this time, the adjustment rope is in the corresponding position.

[0059] When adjustment is needed, simply press button 832, causing it to slide inward. This causes the linkage plate 831 to swing around its hinge rod 834 to the other side. The second spring 833 compresses and stores energy, and the card 835 follows the swing of the linkage plate 831, retracting into the inside of the adjusting handle 820 and contacting the limit position of the gear slot 813. At this time, the adjusting handle 820 is in a rotatable adjustment state. After adjusting to the corresponding position, release button 832. The second spring 833 releases energy, pushing button 832 out again. Simultaneously, the linkage 440 swings back to the other side, and the card 835 re-enters the locking hole 823 and enters the gear slot 813 in the other position, thus achieving gear adjustment. During the above process, the adjusting rope changes position with the swing of the adjusting handle 820, thereby pulling the adjusting seat 420 or causing the adjusting seat 420 to move under the action of the first spring after losing tension. Ultimately, the movement of the adjusting seat 420 changes the rotation radius of the blade 710, thereby achieving resistance adjustment.

[0060] The beneficial effects of this utility model are as follows: This invention controls the adjusting seat 420 to different height positions through the linkage 440, and then uses the connecting piece 500 to drive the blade unit 700 to slide and extend along the radial direction of the rotating bracket 600, so that the blades 710 of the blade unit 700 obtain different rotation radii, thereby changing the magnitude of the agitation water resistance generated, so that users at different training stages can flexibly configure the appropriate resistance intensity according to their own needs.

[0061] This invention uses a linkage 440 to drive the adjustment seat 420 to slide along the guide 410, and with the help of the connector 500, it drives each blade unit 700 to slide radially along the rotating bracket 600, thereby realizing multi-level adjustment of the rotation radius of the blade 710. This allows the blades 710 of the blade unit 700 to obtain different rotation radii, thereby changing the magnitude of the water agitation resistance. This allows users at different training stages to flexibly configure the appropriate resistance intensity according to their own needs.

[0062] Furthermore, by setting up a gear adjustment mechanism 800, users can easily lock the adjustment rope into different gear slots 813 by controlling the limiting cooperation between the adjustment handle 820 and the adjustment component 830, achieving rapid switching and stable locking of resistance without complicated operations or stopping the machine for adjustment; at the same time, the elastic component 430 always provides a reset force for the adjustment seat 420, ensuring smooth adjustment and reliable reset, reducing the user's operating threshold and improving the convenience and continuity of the training process.

[0063] In addition, the guide member 410 adopts multiple sets of surrounding guide units 411 that slide and engage with the guide groove 421 of the adjustment seat 420, and with the boundary limitation of the limiting base 412, it ensures that the sliding process of the adjustment seat 420 is smooth and without deviation, and avoids the blade extension and retraction jamming.

[0064] In addition, the connecting sleeve 450 rotates with the adjusting seat 420 through the rotating groove 425, so that the force direction of the connecting piece 500 when the blade unit 700 rotates is adaptively matched with the rotation direction of the connecting sleeve 450, thereby reducing transmission wear and improving the service life of the structure.

[0065] In addition, the blade units 700 are evenly distributed and are limited by the mounting groove 630 and the limiting structure, which ensures that the blades 710 have strong synchronous expansion and contraction, uniform water resistance, and avoids structural deformation caused by excessive force on one side.

[0066] In particular, the adjustment component 400, the connector 500 and the gear adjustment mechanism 800 are all modularly designed. The guide component 410, the elastic component 430 and the adjustment seat 420 are integrated inside the water tank body 100. The gear adjustment mechanism 800 is external and compact. The overall structure is compact and does not require additional training space. At the same time, it simplifies the internal structure of the water tank and reduces assembly difficulty and production cost.

[0067] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A variable resistance rowing tank structure, characterized in that, include: The main body of the water tank (100) has an axial section in its middle; The water propeller assembly (200) is located inside the water tank body (100) and includes a rotating bracket (600) having a circumferentially rotatably connected to a housing on one axial side of the water tank body (100) and a blade unit (700) circumferentially distributed around the rotating bracket (600). The blade unit (700) includes a blade (710) and a sliding part (720) that is radially slidably connected to the rotating bracket (600). The pull rope assembly (300) is located on the outside of the water tank body (100) and is connected to the rotating bracket (600) for transmission. It is used to drive the rotating bracket (600) and the blade unit (700) to rotate synchronously to generate agitation resistance. The adjustment assembly (400) includes a guide (410) extending axially along the water tank body (100), an adjustment seat (420) slidingly engaged with the extension direction of the guide (410), an elastic element (430), and a linkage element (440). The guide (410) is located inside the water tank body (100) on the opposite side to the water paddle assembly (200). The elastic element (430) is used to keep the adjustment seat (420) moving towards the water paddle assembly (200). One end of the linkage element (440) is connected to the adjustment seat (420) and the other end extends to the outside of the water tank body (100). The outside of the adjustment seat (420) is provided with a connecting sleeve (450) that rotates coaxially with the water tank body (100) and is axially limited. The connector (500) has its two ends hinged to the end of the sliding part (720) and the outside of the connecting sleeve (450), respectively.

2. The variable resistance rowing tank structure according to claim 1, characterized in that, The rotating bracket (600) is provided with a mounting groove (630) that slides with the sliding part (720) along its radial direction. The mounting groove (630) is provided with a limiting structure for limiting the movement of the blade unit (700) along the radial direction of the rotating bracket (600).

3. The variable resistance rowing tank structure according to claim 2, characterized in that, The limiting structure is provided in two sets at the front and rear positions along the extension direction of the mounting groove (630).

4. The variable resistance rowing tank structure according to claim 1, characterized in that, The blade unit (700) is provided in at least 3 units and is evenly distributed around the rotating support (600) in the circumference.

5. The variable resistance rowing tank structure according to claim 4, characterized in that, The guide member (410) includes at least two guide units (411) distributed around the same circumference. The bottom of the guide unit (411) is connected to the same limiting base (412). The adjusting seat (420) has guide grooves (421) that are the same number as the guide units (411) and opposite in position along its axial direction. The guide grooves (421) are slidably engaged with the guide units (411). The limiting base (412) is used to stop the adjusting seat (420) as the sliding boundary of the adjusting seat (420).

6. The variable resistance rowing tank structure according to claim 5, characterized in that, The adjusting seat (420) includes a top plate (422), a spindle (423) protruding to one side along the center of the top plate (422), and a limiting sleeve (424) located at the end of the spindle (423) away from the top plate (422). The limiting sleeve (424), the outer periphery of the spindle (423), and the top plate (422) enclose and form a rotating groove (425). The connecting sleeve (450) is rotatably embedded in the rotating groove (425).

7. The variable resistance rowing tank structure according to claim 6, characterized in that, The outer periphery of the connecting sleeve (450) is provided with connecting ears (460) that are one-to-one with the connecting member (500). The connecting ears (460) are provided with hinge holes, and the end of the connecting member (500) is pivotally connected to the hinge holes.

8. The variable resistance rowing tank structure according to claim 5, characterized in that, The elastic element (430) is a first spring, which is sleeved on the outer periphery of several guide units (411) and its upper and lower ends respectively move to abut against the inner surface of the water tank body (100) and the end face of the adjustment seat (420).

9. The variable resistance rowing tank structure according to claim 1, characterized in that, The linkage (440) is an adjustment rope. One end of the adjustment rope is detachably fixed to the adjustment seat (420), and the other end extends through the axial direction of the water tank body (100) to the outside of the water tank body (100).

10. The variable resistance rowing tank structure according to claim 9, characterized in that, It also includes a gear adjustment mechanism (800), which includes a base plate (810), an adjustment handle (820), and an adjustment component (830). The base plate (810) has a mounting hole (811), and support plates (812) protrude from both sides of the mounting hole (811). The middle part of the adjustment handle (820) is rotatably disposed between the two support plates (812), and its upper and lower ends are respectively located on different sides of the mounting hole (811). One of the support plates (812) has a plurality of gear slots (813) distributed circumferentially along the rotation axis of the adjustment handle (820). The end of the adjustment rope is disposed at the end of the adjustment handle (820). The adjustment component (830) is limited to the plurality of gear slots (813) so that the adjustment rope is in different pulling positions.

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