Patent Publication Number: US-2023148081-A1

Title: Hydraulic damping device with adjustable resistance and a riding platform

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims priority to Chinese Patent Application No. 202111314419.0, filed on Nov. 8, 2021. The content of all of which is incorporate herein by reference. 
     FIELD OF THE DISCLOSURE 
     The present disclosure relates to the mechanical field, in particular to a hydraulic damping device with adjustable resistance and a riding platform. 
     BACKGROUND 
     Damping device is a device that absorbs motion energy or provides motion resistance. The excellent energy absorption characteristics make it widely used in scientific research and application fields, especially in aerospace, aviation, military industry, gun, automobile and other industries. With the improvement of people&#39;s living standards and the rise of fitness industry. The damping device has also been rapidly popularized and applied in the fitness equipment industry. For example, a riding platform simulating riding training and the rowing machine simulating rowing training are equipped with damping devices. 
     According to the principle of generating resistance, common damping devices are roughly divided into three types, namely electromagnetic damping device, gas damping device and liquid damping device. The liquid damping device uses liquid to provide resistance. Because the liquid itself is smooth and soft, the resistance provided by liquid often has smooth characteristics, and the liquid damping device has no noise during operation. Therefore, the liquid damping device has been applied in many fields. 
     However, the liquid damping device in the prior art is often not able to adjust the resistance, or can only adjust the resistance by replacing the liquid with different viscosity, which not only consumes the labor of the user, but also has little effect on adjusting the resistance. The application of the liquid damping device is therefore limited and the satisfaction of the user with the use of the equipment related to the liquid damping device is weaken. 
     Therefore, the existing technology needs to be improved and developed. 
     BRIEF SUMMARY OF THE DISCLOSURE 
     In view of the shortcomings of the above prior art, the purpose of the present disclosure is to provide a hydraulic damping device with adjustable resistance and a riding platform, which aims to solve the problem that the resistance of the hydraulic damping device cannot be adjusted in the prior art. 
     The technical scheme of the present disclosure is as follows: 
     A hydraulic damping device with adjustable resistance, which includes a frame body, a shaft mechanism, a flywheel and a hydraulic damping mechanism, the shaft mechanism is arranged on the frame body, one end of the shaft mechanism is connected with the hydraulic damping mechanism and another end of the shaft mechanism is connected with the flywheel. The hydraulic damping mechanism includes: 
     a cavity; 
     a rotating disc provided with blades, the rotating disc is arranged in the cavity; and 
     a liquid level height adjusting mechanism movably connected inside the cavity to control a liquid level height in the cavity. 
     In the liquid damping device with adjustable resistance, the liquid level height adjusting mechanism is an adjusting disc, and a recess is arranged on the adjusting disc. 
     In the hydraulic damping device with adjustable resistance, the recess comprises at least one through hole. 
     In the hydraulic damping device with adjustable resistance, an adjusting rod is arranged on the adjusting disc, and the adjusting rod extends to an outside of the cavity. 
     In the hydraulic damping device with adjustable resistance, an inner sleeve is arranged in the cavity. 
     In the hydraulic damping device with adjustable resistance, at least one interface is arranged on the frame body corresponding to a position of the shaft mechanism. 
     In the hydraulic damping device with adjustable resistance, further includes a first housing and a second housing which are detachably connected with each other, and a first adjusting groove is arranged on the first housing. 
     In the liquid damping device with adjustable resistance, the liquid level height adjustment mechanism is a slider. 
     In the hydraulic damping device with adjustable resistance, a magnet is arranged on the slider. 
     The present disclosure also provides a riding platform, which includes a support frame, the support frame is connected with the hydraulic damping device with adjustable resistance as described above. 
     Beneficial effects: the disclosure provides a hydraulic damping device with adjustable resistance and a riding platform, the hydraulic damping device with adjustable resistance includes a frame body, a shaft mechanism, a flywheel and a hydraulic damping mechanism, the shaft mechanism is arranged on the frame body, one end of the shaft mechanism is connected with the hydraulic damping mechanism and another end of the shaft mechanism is connected with the flywheel. The hydraulic damping mechanism includes a cavity; a rotating disc provided with blades, the rotating disc is arranged in the cavity; and a liquid level height adjusting mechanism movably connected inside the cavity to control a liquid level height in the cavity. The present disclosure controls the liquid level height of the liquid in the cavity through the liquid level height adjustment mechanism, so as to control the depth of the rotating disc immersed in the liquid, and to realize the control of the resistance between the rotating disc and the liquid. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a structural diagram of a hydraulic damping device with adjustable resistance according to the present disclosure; 
         FIG.  2    is a sectional view of the hydraulic damping device with adjustable resistance according to an embodiment of the present disclosure; 
         FIG.  3    is an exploded view of a frame body and a shaft mechanism according to the present disclosure; 
         FIG.  4    is an exploded view of a hydraulic damping mechanism according to an embodiment of the present disclosure; 
         FIG.  5    is a structural diagram of the adjusting disc according to the present disclosure; 
         FIG.  6    is a structural diagram of the adjusting disc with a recess being at a lower end of the cavity according to the present disclosure; 
         FIG.  7    is a structural diagram of the adjusting disc with a recess being at an upper end of the cavity according to the present disclosure; 
         FIG.  8    is a structural diagram of the adjusting disc with a recess being a through hole according to the present disclosure; 
         FIG.  9    is a partial sectional view of a hydraulic damping device with adjustable resistance according to another embodiment of the present disclosure; 
         FIG.  10    is a structural diagram of a first housing and a slider according to the present disclosure; 
         FIG.  11    is a structural diagram of an inner sleeve according to the present disclosure; 
         FIG.  12    is a structural diagram of a riding platform according to the present disclosure; 
         FIG.  13    is an exploded view of the cavity according to the present disclosure; 
         FIG.  14    is a sectional view of the first housing according to the present disclosure. 
     
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS 
     In order to make the purpose, technical scheme and effect of the present disclosure clear and definite, the present disclosure is further described in detail with reference to the attached drawings and embodiments. It should be understood that the embodiments described herein are only used to explain the present disclosure and are not used to limit the present disclosure. 
     The present disclosure provides a hydraulic damping device with adjustable resistance, as shown in  FIG.  1    and  FIG.  2   . The hydraulic damping device with adjustable resistance includes a frame body  300 , a shaft mechanism  200 , a flywheel  400  and a hydraulic damping mechanism  100 . One end of the shaft mechanism  200  is connected with the hydraulic damping mechanism  100 , and another end of the shaft mechanism  200  is connected with the flywheel  400 . Therefore, through the operation of the hydraulic damping mechanism  100  and the rotation of the flywheel  400 , a smooth and continuous resistance can be provided for the hydraulic damping device with adjustable resistance. The shaft mechanism  200  is arranged on the frame body  300 , so the hydraulic damping device with adjustable resistance can be flexibly arranged in different places or equipped on different equipment through the frame body  300 . For example, the hydraulic damping device with adjustable resistance may be fixed on the wall, the ground and other places through the frame body  300 . 
     As shown in  FIG.  2    and  FIG.  3   , the frame body  300  is provided with an interface  311  corresponding to a position of the shaft mechanism  200 , so that the heat generated by the shaft mechanism  200  during rotation can be released outward through the interface  311  to reduce the temperature of the shaft mechanism  200 . The interface  311  can also be used to connect the hydraulic damping device with adjustable resistance to an external equipment, to help the external equipment obtain resistance or to offset the energy generated by the external equipment. 
     As shown in  FIG.  3   , the shaft mechanism  200  may include a shaft rod  210 , a first rolling bearing  231  and a second rolling bearing  232 . For example, the first rolling bearing  231  is arranged at one end of the frame body  300 , and the second rolling bearing  232  is arranged at another end of the frame body  300 . The shaft rod  210  is movably connected to the frame body  300  through the first rolling bearing  231  and the second rolling bearing  232 , so that the shaft rod  210  can rotate smoothly with low wear. At least one sleeve  220  may be sleeved on an outside of the shaft rod  210 , and different connecting mechanisms can be arranged on the outside of the sleeve  220  to realize connection with external equipment in various connection modes. For example, the shaft rod  210  is sleeved with a first sleeve and a second sleeve, and an outer side of the first sleeve is provided with strip anti-skid lines. The first sleeve can be used for being contacted with the external equipment and being rotated to obtain resistance. The outside of the second sleeve is provided with a gear, and the second sleeve can be used for being connected with the external equipment through the gear and a chain to obtain resistance. The hydraulic damping device with adjustable resistance can be connected with external equipment in various connection forms, which expands the application range. 
     Blades in fan-shaped can be arranged on both ends of the sleeve  220 , therefore the resistance may be generated by the friction between the blades and air when the shaft rod  210  drives the sleeve  220  to rotate, to increase the resistance of the resistance adjustable liquid damping device. When the blades rotate, wind may also be generated to accelerate the heat dissipation speed of the shaft mechanism  200 . For example, the wind generated by the sleeve  220  driving the blades accelerates the release of heat generated by the shaft rod  210 , the first rolling bearing  231  and the second rolling bearing  232  due to friction. And the external equipment connected to the shaft mechanism  200  is also cooled, to prevent the external equipment from overheating and aging. 
     As shown in  FIG.  2    and  FIG.  4   , the liquid damping mechanism includes a cavity  140 , a rotating disc  110  and a liquid level height adjusting mechanism  120 . The cavity  140  is connected with the frame body  300 , and liquid is installed in the cavity  140 . Therefore, the rotation of the rotating disc  110  in the liquid provides resistance for the hydraulic damping mechanism  100 . The damping liquid in the cavity  140  refers to substance having flow property similar to liquid, such as various liquid, solid-liquid mixture, particulate materials, etc. The liquid in the cavity  140  does not completely fill a space in the cavity  140 . For example, silicone oil with a space ratio of 50% is injected into the cavity  140  to make a part of the rotating disc  110  contact with the liquid, so as to adjust the resistance of the rotating disc  110  by adjusting the height of the damping liquid contacted by the rotating disc  110 , to control the output resistance of the hydraulic damping device with adjustable resistance. 
     As shown in  FIG.  13    and  FIG.  14   , the cavity  140  can be composed of a first housing  141  and a second housing  142 . The second housing  142  is connected with the frame body  300 , the second housing  142  is detachably connected with the first housing  141 , and the first housing  141  is rotatably connected with the second housing  142 . A first adjusting groove  128  is arranged on one side of the first housing  141  facing the second housing  142 . User may rotate the first housing  141  to adjust a position of the first adjusting groove  128  in the cavity  140  according to resistance requirement, therefore the height of the liquid level of the damping liquid in the cavity  140  is adjusted to adjust the resistance. For example, the first adjusting groove  128  is located on a top of the cavity  140  at first, user may rotate the first housing  141  clockwise for 180 degrees to locate the first adjusting groove  128  on a bottom of the cavity  140 . The damping liquid is then flowed into the first adjusting groove  128  to lower the liquid level height of the damping liquid in the cavity  140 , thus the resistance is reduced when the rotating disc  110  rotates in the damping liquid. It would be easy and cost little for arranging a first adjusting groove  128  on the first housing  141 . For example, the first adjusting groove  128  may be rapidly manufactured by stamping and forming method. The operation of rotating the first adjusting groove  128  by rotating the first housing  141  is simple, there would be no need for providing training for the user. 
     As shown in  FIG.  4   , the cavity  140  may be composed of a third housing  143  and a fourth housing  144 . The third housing  143  is connect with the frame body  300 , and the third housing  143  is detachably connected with the fourth housing  144 , so that it would be convenient for the user to change the damping liquid in the cavity  140  or to maintain the components in the cavity  140  such as the rotating disc  110  and the adjusting disc  121 . 
     As shown in  FIG.  2   , the rotating disc  110  is connected with the shaft rod  210 . For example, the shaft rod  210  is connected to a center position of the rotating disc  110  so that the rotating disc  110  can rotate synchronously with the shaft rod  210 . Therefore, the resistance between the rotating disc  110  and the damping liquid is transmitted to external equipment through the shaft mechanism  200 . The shaft rod  210  may indirectly drive the rotating disc  110  to rotate synchronously through magnetic force. For example, a magnet is connected with the shaft rod  210 , another magnet is connected with the rotating disc  110 . When the shaft rod  210  starts to rotate, the rotating disc rotates under the magnetic force. 
     As shown in  FIG.  4   , the rotating disc  110  is provided with a plurality of blades  111 . The blades  111  rotate synchronously with the rotating disc  110  when the rotating disc  110  rotates under the drive of an external device. The resistance is generated through the interaction between the blades  111  and the damping liquid in the cavity  140 . The blades  111  can also be connected with the rotating disc  110  at an adjustable angle, so that the resistance between the rotating disc  110  and the damping liquid can be adjusted. For example, the blades  111  arranged at a certain angle relative to the rotating disc  110  is detachably connected to the rotating disc  110  through screws, and the user may connect the blades  111  at another angle relative to the rotating disc  110 , so that the resistance between the blades  111  and the damping liquid varies according to the blades  111  having different angles, and the resistance output can be different. When the blades  111  rotate with the rotating disc  110 , the blades  111  above the liquid level may disturb the air to generate wind, thereby cooling the cavity  140 . 
     As shown in  FIG.  4   , the liquid level height adjusting mechanism  120  is arranged in the cavity  140  to control the liquid level height of the damping liquid in the cavity  140 . Therefore, when the rotating disc  110  rotates in the damping liquid at a fixed speed, the deeper the liquid level height of the rotating disc  110  immersed in the liquid, the greater the resistance between the damping liquid and the rotating disc  110 . The shallower the liquid level of the rotating disc  110  immersed in the liquid, the smaller the resistance between the rotating disc  110  and the damping liquid. Therefore, the value of the resistance can be controlled by adjusting the liquid level height of the damping liquid through the liquid level height adjusting mechanism  120 . 
     As shown in  FIG.  5   , the liquid level height adjusting mechanism  120  may be an adjusting disc  121 , on which at least one recess  122  is arranged. The recess  122  may be a groove with a gradually deepening volume recessed into the adjusting disc  121 , so as to control the liquid level height in the cavity  140  by controlling the volume of the recess  122  immersed in the liquid, Therefore the liquid level height of the damping liquid in the cavity  140  is controlled to adjust the resistance when rotating the rotating disc  110 . Taking the liquid damping device of a fitness equipment riding platform as an example, the adjusting disc of the liquid damping device of the riding platform is provided with the recess  122 . As shown in  FIG.  6   , rotate the adjusting disc  121  so that the recess  122  is located at the lower end of the cavity  140  and immersed in the damping liquid. The damping liquid flows into the space in the recess  122 , and the liquid level height is low, the resistance received by the rotating disc  110  during rotation is small, which can meet the entertainment experience for users such as children, to ride quickly with less force. As shown in  FIG.  7   , rotate the adjusting disc  121  so that the recess  122  is located above the damping liquid, i.e. the plane part of the adjusting disc  121  immerses into the damping liquid, the liquid level height of the damping liquid in the cavity  140  rises, and the rotating disc  110  suffers great resistance from the damping liquid during rotation, which can meet the training purpose of adult users to overcome the resistance with great strength. Thus, personalized needs of different users are met by controlling the volume of the recess  122  of the rotating disc  110  immersed in the damping liquid to adjust the resistance of the liquid damping mechanism. 
     As shown in  FIG.  8   , the recess  122  may be a through hole. Therefore, when rotating the adjusting disc  121  to adjust the liquid level height of the damping liquid, the liquid previously flowing into the through hole can quickly flow out of the through hole, so that the liquid level height of the damping liquid can quickly reach a corresponding height, so that the rotating disc  110  is quickly subjected to the resistance corresponding to the liquid level height. 
     As shown in  FIG.  5   , an adjusting rod  123  is arranged on the adjusting disc  121 , and the adjusting rod  123  extends to the outside of the cavity  140  to facilitate the user to drive the adjusting disc  121  from outside by rotating the adjusting rod  123  to adjust the resistance in real time. For example, the adjusting rod  123  is arranged at the center of the adjusting disc  121 , and the adjusting rod  123  extends out of the hydraulic damping device with adjustable resistance through the cavity formed by the shaft mechanism  200  and the flywheel  400 , so that the user can rotate the adjusting rod  123  to control the resistance. The adjusting rod  123  may also extend to the outside of the hydraulic damping device with adjustable resistance through the fourth housing  144  to facilitate the user to rotate the adjusting rod  123  to adjust the resistance. The user can connect the adjusting rod  123  with an intelligent motor, and control a rotation degree of the motor to control the adjusting disc  121  to rotate a corresponding degree through the adjusting rod  123 , so as to control the liquid level height in the cavity  140 . The intelligent motor controls the rotation speed or rotation angle, which is a mature prior art and does not belong to the scope of the present disclosure. As shown in  FIG.  4   , a grip  124  may be arranged at one end of the adjusting rod  123  extending out of the hydraulic damping device with adjustable resistance, and one end of the grip  124  is locked with the cavity  140 . Therefore, the user may manually adjust the adjusting rod  123  and fix the grip  124  after reaching a satisfactory effect, so as to ensure that the resistance effect remains unchanged and realize manually and quickly adjust the resistance without power, which is convenient for users. 
     As shown in  FIGS.  9  and  10   , the liquid level height adjusting mechanism  120  may be a slider  125  arranged in the cavity  140 . The liquid level height in the cavity  140  is controlled through the volume of the slider  125  immersed in the liquid, so as to control the resistance between the rotating disc  110  and the damping liquid. For example, a slide path  126  is arranged on an inner side of the second housing  142  of the cavity  140 , the slider  125  can slide in the slide path  126 . A magnet  127  is arranged on the slider  125 , so that the user can control the movement of the slider  125  along the slide path  126  through another magnet outside the hydraulic damping device with adjustable resistance to change the liquid level height in the cavity  140 . That is, the larger the volume of the slider  125  immersed in the liquid, the higher the liquid level of the damping liquid, and the greater the resistance for the rotating disc  110 . The direction of the movement of the slider  125  in the cavity  140  is not limited. For example, the slider  125  may slides toward or away from the rotating disc  110 . The height of the slider  125  is greater than the liquid level height in the cavity  140  when the slider  125  is closest to the rotating disc  110 . Therefore, when the slider  125  slides toward the rotating disc  110 , the liquid level height of the damping liquid increases gradually, and the volume of the rotating disc  110  immersed in the damping liquid raises which leads to a greater resistance between the rotating disc  110  and the damping liquid. When the slider  125  slides away from the rotating disc  110 , the liquid level height of the damping liquid decreases, which leads a less resistance between the rotating disc  110  and the damping liquid. By the simple operation of sliding the slider  125  in the cavity  140 , the resistance between the rotating disc  110  and the damping liquid may be adjusted. 
     As shown in  FIG.  2    and  FIG.  11   , an inner sleeve  130  is arranged inside the cavity  140 . The inner sleeve  130  is detachably arranged on the inner side of the cavity  140 . The inner sleeve  130  can be any shape, such as conical and cylindrical, so as to adjust the resistance between the rotating disc  110  and the damping liquid with different shapes cooperating with the liquid level height adjusting mechanism  120 . An inner side of the inner sleeve  130  may also be provided with a resistance rib  131 , which can be various structures, such as spiral stripe, concave convex structure, etc., to cooperate with the liquid level height adjusting mechanism  120  to increase the resistance effect. 
     A second adjusting groove may be arranged on the inner sleeve  130 . The user may adjust a position of the second adjusting groove in the cavity  140  by rotating the inner sleeve  130 , to control the liquid level height of the damping liquid in the cavity  140  and adjust the resistance. For example, the second adjusting groove is arranged on a bottom of the cavity  140  at first, the user may rotate the inner sleeve  130  to locate the second adjusting groove on a top of the cavity  140  and fixed the inner sleeve  130  in the cavity  140 . Thus the liquid level of the damping liquid raises and the resistance between the rotating disc  110  and the damping liquid increases. 
     As shown in  FIG.  12   , the present disclosure also provides a riding platform  500 . The riding platform includes a support frame  510  and a hydraulic damping device with adjustable resistance. The structural characteristics and corresponding technical effects of the hydraulic damping device with adjustable resistance are the same as those described above and will not be repeated here. When the user is trained through the riding platform  500 , the user may adjust the resistance according to their own training requirements or training plan during any period of the training, and carry out targeted personalized training. 
     In order to explain the hydraulic damping device with adjustable resistance and the riding platform of the present disclosure, an embodiment is taken as an example. 
     As shown in  FIG.  12   , a riding platform  500  is provided. The riding platform  500  includes a support frame  510  and a hydraulic damping device with adjustable resistance. The hydraulic damping device with adjustable resistance is arranged at the bottom end of the support frame  510 . The support frame  510  is used to fix the bicycle so that the rear wheel of the bicycle contacts the hydraulic damping device with adjustable resistance. The user may ride the bicycle stably so that the user can ride the bicycle in place. The rear wheel of the bicycle obtains a smooth resistance of the approximate riding bicycle from the hydraulic damping device with adjustable resistance, so that the user can obtain a approximate riding feeling indoors. 
     As shown in  FIG.  1    and  FIG.  3   , the hydraulic damping mechanism with adjustable resistance includes a frame body  300 , the frame body  300  includes a fixed frame  320  and a connecting frame  310 , the fixed frame  320  is used to connect with the support frame  510 . The fixed frame  320  may be connected with the support frame  510  at an adjustable angle and position, so that the rear tire of the bicycle can accurately contact the hydraulic damping mechanism with adjustable resistance. The connecting frame  310  is arranged at the upper end of the fixed frame  320 , and the connecting frame  310  is a cylindrical structure. One end of the connecting frame  310  is provided with a first rolling bearing  231 , the other end of the connecting frame  310  is provided with a second rolling bearing  232 , and a shaft rod  210  is movably connected with the connecting frame  310  through the first rolling bearing  231  and the second rolling bearing  232 . Thus, the shaft rod  210  can rotate smoothly with low wear. 
     As shown in  FIG.  2    and  FIG.  3   , the shaft rod  210  is covered with a sleeve  220 , which is used to be in contact with the rear tire of the bicycle. When the rear tire of the bicycle contacts and rotates with the sleeve  220 , the sleeve  220  is driven to rotate synchronously, so as to drive the shaft rod  210  to rotate, and obtain the resistance from the hydraulic damping device with adjustable resistance. The outer side of the sleeve  220  is provided with anti-skid stripes for stable contact between the rear tire of the bicycle and the sleeve  220  to prevent slipping and wear of the rear tire of the bicycle. The connecting frame  310  is provided with an interface  311  corresponding to a position of the sleeve  220  so that the rear tire of the bicycle is in contact with the sleeve  220 . 
     As shown in  FIG.  1    and  FIG.  2   , one end of the connecting frame  310  facing the cavity  140  is provided with an outward extending edge, and the position of the cavity  140  corresponding to the edge is provided with a protrusion adapted to the edge, so that the protrusion is clamped into the edge to increase the stability of the connection between the frame body  300  and the cavity  140 . 
     As shown in  FIG.  4   , the cavity is composed of the third housing  143  and the fourth housing  144  which are detachably connected with each other to facilitate the user to replace the silicone oil in the cavity  140 . A sealing ring is arranged between the third housing  143  and the fourth housing  144  to prevent silicone oil leak from the cavity  140 . The silicone oil in the cavity  140  accounts for one-half of the volume of the cavity  140 , thereby the resistance is provided to the liquid damping mechanism through the silicone oil. 
     As shown in  FIG.  2    and  FIG.  4   , a rotating disc  110  is connected with a shaft rod  210  extending into the cavity  140 . A plurality of blades  111  are arranged radially on the rotating disc  110 , so that the resistance is obtained when the blades  111  contacts the silicone oil in the cavity  140 . When the rotating disc  110  rotates, the blades  111  located above the silicone oil may generate wind during rotation to reduce the temperature in the cavity  140 . 
     As shown in  FIG.  4    and  FIG.  8   , an adjusting disc  121  is also arranged on one side of the fourth housing  144 . The adjusting disc  121  is provided with a first through hole  151 , a second through hole  152 , a third through hole  153  and a fourth through hole  154 . An adjusting rod  123  is arranged on the central position of the adjusting disc  121 , which extends to the outside through the second housing  142  and is controlled by a grip. The fourth housing  144  is provided with a positioning hole corresponding to the position of the grip. When the user needs to train under large resistance, rotate the grip to rotate the adjusting disc  121 , immerse a non-through hole portion of the adjusting disc  121  into silicone oil to maximize the liquid level in the cavity  140 , and fix the grip  124  on the second housing  142  through the positioning hole to ensure that the adjusting disc  121  is fixed relative to the second housing  142  and the liquid level of the silicone oil in the cavity  140  is stabilized. When the user is riding, the rotating disc  110  suffers a large resistance from the silicone oil, and the user obtains the corresponding resistance. When the user needs to reduce the difficulty of training, the user rotates the grip  124  and adjusts the rotating disc  110  so that the first through hole  151  and the second through hole  152  are immersed in the silicone oil, the silicone oil flows into the first through hole  151  and the second through hole  152  and the liquid level height is reduced, therefore the resistance of the rotating disc  110  from the silicone oil is reduced during rotation and the user would train under the reduced resistance. When the user would like to further reduce the riding resistance, rotate the grip so that the first through hole  151 , the second through hole  152  and the third through hole  153  are all immersed in the silicone oil, the silicone oil quickly enters the third through hole  153 , and the liquid level height of the silicone oil is further reduced. Therefore the resistance received by the rotating disc  110  is correspondingly reduced during rotation, and the training needs of users with small resistance can be realized. 
     The present disclosure provides a hydraulic damping device with adjustable resistance. The hydraulic damping device with adjustable resistance includes a frame body  300 , a shaft mechanism  200 , a flywheel  400  and a hydraulic damping mechanism  100 . The shaft mechanism  200  is arranged on the frame body  300 , and the flywheel  400  and the hydraulic damping mechanism  100  are respectively arranged at both ends of the frame body  300 . Thus, a smooth resistance is provided for the hydraulic damping mechanism with adjustable resistance. The hydraulic damping mechanism includes a cavity  140 , a rotating disc  110  and a liquid level height adjusting mechanism  120 . The cavity  140  is used to contain damping liquid to provide resistance to the rotating disc  110  when the rotating disc  110  rotates in the damping liquid. The rotating disc  110  is provided with a plurality of blades  111 , and the angle of the blade  111  relative to the rotating disc  110  may be adjusted to obtain different resistance by adjusting the angle. The liquid level height adjusting mechanism  120  may be a adjusting disc  121  provided with a recess  122 . By immersing the damping liquid into the recess  122  and changing the liquid level height of the damping liquid in the cavity  140 , the resistance is controlled. The adjusting disc  121  is further provided with an adjusting rod  123 , which extends out of the cavity  140 . So that the user may control the resistance in real time outside the cavity  140  and the personalized needs of the user can be fulfilled. The liquid level height adjusting mechanism  120  may also be a slider  125 , which can be movably connected in the cavity  140  through a slide path  126 . The resistance is adjusted by controlling the liquid level height through adjusting the volume of the slider  125  immersed in the liquid, the structure is simple and the operation is convenient, and the resistance can be controlled in real time. The cavity  140  is also provided with an inner sleeve  130 , which is detachably connected with the cavity  140 , so that the user can replace the inner sleeve  130  according to the actual demand. The inner side of the inner sleeve  130  may be provided with a resistance rib  131  to increase the resistance effect. The inner sleeve  130  may further be provided with a second adjusting groove, and the liquid level height of the damping liquid in the cavity  140  is adjusted by changing the position of the second adjusting groove though rotating the inner sleeve  130 . The cavity may be composed of a first housing  141  and a second housing  142 . A first adjusting groove is arranged on the first housing  141 . Therefore the resistance may be controlled by adjusting the liquid level height of the damping liquid while changing the position of the first adjusting groove in the cavity  140  through rotating the first housing  141 . The present disclosure also provides a riding platform  500 , which includes a support frame  510  and the hydraulic damping device with adjustable resistance. Therefore, the user can connect the riding device with the hydraulic damping device with adjustable resistance in a variety of ways, and the resistance can be adjusted by the liquid damping device with adjustable resistance, to meet the personalized needs of users or external devices. 
     It should be understood that the application of the present disclosure is not limited to the above embodiments. For those skilled in the art, it can be improved or transformed according to the above description. All these improvements and transformations should belong to the protection scope of the appended claims of the present disclosure.