Water-resistance rowing exercise machine

Abstract

Provided is a water-resistance rowing exercise machine, comprising a bracket, a water tank fixed to the bracket, a linkage mechanism, a rotation angle adjustment mechanism. The water tank is internally provided with a first impeller and a second impeller. The first impeller comprises a first plate portion and a plurality of first blades distributed on the periphery of the first plate portion. The second impeller comprises a second plate portion and a plurality of second blades distributed on the periphery of the second plate portion. The rotation angle adjustment mechanism is configured to adjust a relative rotation angle between the first impeller and the second impeller the first blades and the second blades may approach to or depart from each other. The distance between the first blades and the second blades can be adjusted by adjusting the relative rotation angle between the first impeller and the second impeller.

What is claimed is: 
     
         1 . A water-resistance rowing exercise machine, comprising: a bracket, a water tank fixed on the bracket, a linkage mechanism and a rotation angle adjustment mechanism, wherein a first impeller and a second impeller are disposed inside the water tank;
 the linkage mechanism comprises a rotation shaft assembly partially inserted into the water tank and connecting the first impeller and the second impeller, a pulley fixed on a portion of the rotation shaft assembly located outside the water tank, a conveyer belt capable of being wound around the pulley, a handle connected to an end of the conveyor belt away from the pulley, and an elastic rope connected to the bracket and capable of being wound on the pulley;   the first impeller comprises a first plate portion and a number of first blades distributed on the periphery of the first plate portion;   the second impeller comprises a second plate portion and a number of second blades distributed on the periphery of the second plate portion; and   the rotation angle adjustment mechanism is configured to adjust a relative rotation angle between the first impeller and the second impeller so as to enable the first blades and the second blades to approach toward or depart from each other.   
     
     
         2 . The water-resistance rowing exercise machine of  claim 1 , wherein the rotation angle adjustment mechanism comprises a first gear portion fixed to the second plate portion, a second gear portion capable of approaching the first gear portion to mesh therewith and push the second plate portion to move toward the first plate portion or capable of moving away from the first gear portion to be disengaged therefrom, a knob connected to the second gear portion and located outside the water tank, a compression spring having two ends bearing against the first plate portion and the second plate portion respectively, and a clamping mechanism located on a side of the second plate portion away from the first plate portion and fixed to the rotation shaft assembly;
 and wherein the clamping mechanism is capable of clamping the second plate portion so that the second impeller is able to rotate along with the rotation of the rotation shaft assembly, and the clamping mechanism is capable of being disengaged from the second plate portion when the second plate portion moves toward the first plate portion.   
     
     
         3 . The water-resistance rowing exercise machine of  claim 2 , wherein a push shaft is fixed on a side of the second gear portion away from the first gear portion, and the push shaft is fixed to the knob after passing through a shaft hole on a side wall of the water tank;
 a return spring is disposed between the knob and the side wall of the water tank; and   the knob is configured to push the second gear portion toward the first gear portion so that the second gear portion can be meshed with the first gear portion and can continue to push the second plate portion to move close to the first plate portion, making the clamping mechanism to be disengaged from the second plate portion, and configured to rotate the second impeller after the clamping mechanism is disengaged from the second plate portion.   
     
     
         4 . The water-resistance rowing exercise machine of  claim 2 , wherein the clamping mechanism comprises at least one limiting post, and the second plate portion is provided with at least one group of holes corresponding to the limiting post, and wherein the group of holes comprises a plurality of limiting holes capable of accommodating the limiting post. 
     
     
         5 . The water-resistance rowing exercise machine of  claim 4 , wherein each group of holes comprises two limiting holes, and an angle between two perpendicular lines from the two limiting holes to an axis of the rotation shaft assembly is 30°. 
     
     
         6 . The water-resistance rowing exercise machine of  claim 4 , wherein the clamping mechanism further comprises a clamping plate, a fastening screw, and a compression ring;
 and wherein the clamping plate is key-connected with an end of the rotation shaft assembly so that the clamping plate can rotate synchronously with the rotation shaft assembly;   a cap is provided at an end of the limiting post away from the second plate portion, and the limiting post is configured to pass through a perforation hole on the clamping plate; and   the fastening screw is configured to be screwed to an internal threaded hole at the end of the rotation shaft assembly and press the compression ring so that the compression ring can press the cap against the clamping plate.   
     
     
         7 . The water-resistance rowing exercise machine of  claim 2 , wherein the second plate portion is provided with a bowl portion protruding toward a side away from the first plate portion, and the compression spring is configured to bear against the bowl portion. 
     
     
         8 . The water-resistance rowing exercise machine of  claim 1 , wherein the pulley comprises a first cylinder, a second cylinder coaxially sleeved outside the middle of the first cylinder, and a plurality of connection plates disposed between the first cylinder and the second cylinder and spaced apart from each other;
 and wherein the two ends of the elastic rope are fixedly connected to the bracket, and a middle portion of the elastic rope passes through a gap between the two adjacent connection plates; and   an end of the conveyor belt away from the handle is fixed to the second cylinder.   
     
     
         9 . The water-resistance rowing exercise machine of  claim 1 , wherein there are two water tanks; the axis of the rotation shaft assembly is horizontally arranged, and the two water tanks are arranged on two sides of the pulley. 
     
     
         10 . The water-resistance rowing exercise machine of  claim 1 , wherein the water-resistance rowing exercise machine further comprises a linear guide rail, and a seat cushion capable of sliding along the linear guide rail is mounted on the linear guide rail;
 and wherein the linear guide rail is mounted on a telescopic plate;   a slide rail is provided on the bracket; and   the telescopic plate is capable of being extended or retracted on the slide rail.   
     
     
         11 . The water-resistance rowing exercise machine of  claim 3 , wherein the clamping mechanism comprises at least one limiting post, and the second plate portion is provided with at least one group of holes corresponding to the limiting post, and wherein the group of holes comprises a plurality of limiting holes capable of accommodating the limiting post. 
     
     
         12 . The water-resistance rowing exercise machine of  claim 2 , wherein there are two water tanks; the axis of the rotation shaft assembly is horizontally arranged, and the two water tanks are arranged on two sides of the pulley. 
     
     
         13 . The water-resistance rowing exercise machine of  claim 3 , wherein there are two water tanks; the axis of the rotation shaft assembly is horizontally arranged, and the two water tanks are arranged on two sides of the pulley. 
     
     
         14 . The water-resistance rowing exercise machine of  claim 7 , wherein there are two water tanks; the axis of the rotation shaft assembly is horizontally arranged, and the two water tanks are arranged on two sides of the pulley. 
     
     
         15 . The water-resistance rowing exercise machine of  claim 8 , wherein there are two water tanks; the axis of the rotation shaft assembly is horizontally arranged, and the two water tanks are arranged on two sides of the pulley. 
     
     
         16 . The water-resistance rowing exercise machine of  claim 2 , wherein the water-resistance rowing exercise machine further comprises a linear guide rail, and a seat cushion capable of sliding along the linear guide rail is mounted on the linear guide rail;
 and wherein the linear guide rail is mounted on a telescopic plate;   a slide rail is provided on the bracket; and   the telescopic plate is capable of being extended or retracted on the slide rail.   
     
     
         17 . The water-resistance rowing exercise machine of  claim 3 , wherein the water-resistance rowing exercise machine further comprises a linear guide rail, and a seat cushion capable of sliding along the linear guide rail is mounted on the linear guide rail;
 and wherein the linear guide rail is mounted on a telescopic plate;   a slide rail is provided on the bracket; and   the telescopic plate is capable of being extended or retracted on the slide rail.   
     
     
         18 . The water-resistance rowing exercise machine of  claim 7 , wherein the water-resistance rowing exercise machine further comprises a linear guide rail, and a seat cushion capable of sliding along the linear guide rail is mounted on the linear guide rail;
 and wherein the linear guide rail is mounted on a telescopic plate;   a slide rail is provided on the bracket; and   the telescopic plate is capable of being extended or retracted on the slide rail.   
     
     
         19 . The water-resistance rowing exercise machine of  claim 8 , wherein the water-resistance rowing exercise machine further comprises a linear guide rail, and a seat cushion capable of sliding along the linear guide rail is mounted on the linear guide rail;
 and wherein the linear guide rail is mounted on a telescopic plate;   a slide rail is provided on the bracket; and   the telescopic plate is capable of being extended or retracted on the slide rail.