Rowing machine power meter

Abstract

A rowing machine power meter provided by the present invention comprises a support frame, a sensor group and an instrument, the support frame is arranged at the front end of a rowing machine, the support frame is provided with a pulley block, the pulley block is arranged on the support frame, the pulley block is provided with a pulley shaft, the support frame is provided with a pulley shaft seat, and the sensor group is arranged on the pulley shaft seat. The pulley shaft is fixed in a pulley shaft seat, a sensor group is arranged in the pulley shaft seat and comprises a first sensor assembly and a second sensor assembly, the first sensor assembly is arranged on the side face of the pulley block, and the second sensor assembly is arranged in the pulley shaft seat and makes contact with the pulley shaft. The instrument comprises a display screen and a calculation unit, and the calculation unit is electrically connected with the first sensor assembly, the second sensor assembly and the display screen. And interference of factors such as tension and angle on a traditional detection mode is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of fitness equipment, and in particular to a rowing machine power meter. Background Art

[0002] With the improvement of people's health awareness, the popularity of indoor fitness equipment in daily life has been increasing day by day. As a comprehensive aerobic fitness equipment, the rowing machine has been favored by many fitness enthusiasts. It can not only effectively exercise multiple muscle groups, but also simulate the exercise experience of rowing on water, bringing users a pleasant fitness feeling both physically and mentally. However, during the use of the rowing machine, how to accurately obtain the user's exercise data and achieve a quantitative evaluation of the training effect has become an important problem faced by the industry development.

[0003] In the prior art, most rowing machines are not equipped with a dedicated power meter and cannot detect the pulling force exerted by the user on the pulling component. This makes it difficult for users to accurately understand their own exercise intensity and training effect, unable to formulate a scientific and reasonable training plan, and restricting the full utilization of the fitness function of the rowing machine by users. For a small number of rowing machines equipped with a power detection function, there are also deficiencies in data accuracy and function diversity of the power detection technology. Due to the limitations of the detection position and detection principle, the obtained pulling force data is easily interfered by various factors, resulting in low measurement accuracy and unable to truly reflect the actual exercise state of the user. The measurement result is easily affected by the different angles of the user pulling the cable. Summary of the Invention

[0004] The purpose of the present invention is to solve the above problems, and a rowing machine power meter is proposed. When the user pulls the cable, the pulley changes the direction of the force on the cable but does not change the magnitude of the force. Therefore, the force exerted on the cable in the horizontal or vertical direction is exactly the pulling force F of the user. And the force exerted by the cable on the pulley shaft is a pulling force F in the horizontal or vertical direction, and the magnitude of the pulling force is also the pulling force F of the user. The sensor is arranged on the side of the pulley shaft. When the pulley shaft receives the pulling force F transmitted by the cable, the pulley shaft will transmit part or all of this force to the sensor, and the magnitude of the pressure received by the sensor is equal to the pulling force F transmitted by the cable to the pulley shaft.

[0005] To achieve the above object, the following technical solution is adopted: A rowing machine power meter, comprising a support frame, a sensor group and an instrument. The support frame is arranged at the front end of the rowing machine. A pulley is provided on the support frame. The pulley is arranged on the support frame, and a pulley shaft is provided on the pulley. A pulley shaft seat is provided on the support frame. A limiting wheel is arranged at the top of the support frame. The pulley shaft is fixed in the pulley shaft seat. The sensor group includes a first sensor assembly and a second sensor assembly. The first sensor assembly is arranged on the side of the pulley. The second sensor assembly is arranged in the pulley shaft seat and contacts the pulley shaft. The instrument includes a display screen and a calculation unit. The calculation unit is electrically connected to the first sensor assembly, the second sensor assembly and the display screen respectively.

[0006] Preferably, a rowing machine power calculation method includes the following steps: obtaining the angular velocity ω and time t of the pulley through the first sensor assembly on the pulley; calculating the speed v of the cable according to the obtained angular velocity ω, time t and the diameter d of the pulley; obtaining the pressure data F through the second sensor assembly on the pulley shaft, that is, the component of the user's pulling force in the direction of the cable; calculating the real-time power P of the user's rowing action based on the obtained speed v, pressure data F and the proportionality coefficient k.

[0007] Preferably, the pulley shaft seat is convex, and the pulley shaft is arranged on the protruding part in the pulley shaft seat.

[0008] Preferably, the first sensor assembly includes several magnets and a first sensor. The magnets are evenly distributed on the side of the pulley. The first sensor is arranged inside the support frame. The first sensor uses a magnetic field sensor.

[0009] Preferably, when the rowing machine is a single-wheel rowing machine, the sensor assembly is arranged on the side of the pulley shaft of the pulley on the support frame. The pulley shaft seat is arranged on the side of the pulley shaft. The second sensor assembly is arranged vertically in the pulley shaft seat and contacts the pulley shaft.

[0010] Preferably, when the rowing machine is a double-wheel rowing machine, the pulley includes a first pulley and a second pulley. The first pulley is arranged at the upper end of the support frame, and the second pulley is arranged below the first pulley.

[0011] Preferably, the sensor assembly is arranged on the side of the pulley shaft of the first pulley at the upper end of the support frame. The pulley shaft seat is arranged on the side of the pulley shaft. The second sensor assembly is arranged vertically in the pulley shaft seat and contacts the pulley shaft.

[0012] Preferably, the sensor assembly is disposed on the side of the pulley shaft of the first pulley at the upper end of the support frame, the pulley shaft seat is disposed below the pulley shaft, the second sensor assembly is horizontally disposed within the pulley shaft seat, and the second sensor assembly is in contact with the pulley shaft.

[0013] Preferably, the sensor assembly is disposed on the side of the pulley shaft of the second pulley at the lower end of the support frame, the pulley shaft seat is disposed on the side of the pulley shaft, the second sensor assembly is vertically disposed within the pulley shaft seat, and the second sensor assembly is in contact with the pulley shaft.

[0014] Preferably, the sensor assembly is disposed on the side of the pulley shaft of the second pulley at the lower end of the support frame, the pulley shaft seat is disposed above the pulley shaft, the second sensor assembly is horizontally disposed within the pulley shaft seat, and the second sensor assembly is in contact with the pulley shaft.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. By providing the first sensor assembly and the second sensor assembly on the side of the pulley shaft, the rowing machine can detect the rowing power of the user, enabling the user to understand their own exercise intensity and training effect, and thus allowing them to formulate a training plan suitable for themselves according to their own situation.

[0016] 2. The first sensor assembly and the second sensor assembly on the side of the pulley shaft respectively obtain the pulley angular velocity and time, and directly measure the pulling force transmitted from the cable to the pulley shaft, enabling real-time monitoring of the user's motion parameters, effectively avoiding interference from other factors, solving the problem of inaccurate pulling force detection, allowing the user to obtain real and reliable pulling force data, and providing a more accurate basis for evaluating the training intensity.

[0017] 3. The sensor assembly can be disposed on the side of the pulley shaft of the first pulley at the upper end or the second pulley at the lower end of the support frame. The position of the pulley shaft seat and the installation direction of the second sensor assembly are diverse, and can be flexibly adjusted according to the structural characteristics of different rowing machines and user requirements. This advantage enables this power meter to be widely adapted to various types of rowing machines.

[0018] 4. A limiting wheel is provided above the support frame to adjust the direction of the cable pulled by the user to the horizontal direction, avoiding the deviation of the pulling force, which may cause changes in the pulling force parameters and errors, improving the accuracy of the power parameters, and providing the user with more reliable pulling force and power data. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of a rowing machine of the rowing machine power meter according to Embodiment 1 of the present invention; Figure 2 It is a schematic diagram of the power meter of the rowing machine power meter according to Embodiment 1 of the present invention; Figure 3Power calculation method diagram of the rowing machine power meter in the first embodiment of the present invention; Figure 4 Side view of the power meter of the rowing machine power meter in the first embodiment of the present invention; Figure 5 Interface diagram of the power meter of the rowing machine power meter in the first embodiment of the present invention; Figure 6 Schematic diagram of the rowing machine power meter in the first embodiment of the present invention; Figure 7 Schematic diagram of the rowing machine power meter in the second embodiment of the present invention; Figure 8 Schematic diagram of the rowing machine power meter in the third embodiment of the present invention; Figure 9 Schematic diagram of the rowing machine power meter in the fourth embodiment of the present invention; Figure 10 Schematic diagram of the rowing machine power meter in the fourth embodiment of the present invention; Detailed implementation manner

[0020] Hereinafter, the rowing machine power meter of the present invention will be specifically described with reference to the drawings.

[0021] As shown in FIGS. 1 and 2, the rowing machine power meter includes a support frame 1, a sensor group 2, and an instrument 3. The support frame 1 is provided at the front end of the rowing machine. A pulley 11 is provided on the support frame 1. A pulley shaft 12 is provided on the pulley 11. A pulley shaft seat 13 is provided on the support frame 1. A limiting wheel 14 is provided at the top of the support frame 1. The pulley shaft 12 is fixed in the pulley shaft seat 13. The sensor group 2 includes a first sensor assembly 21 and a second sensor assembly 22. The first sensor assembly 21 is provided on the side of the pulley 11. The second sensor assembly 22 is provided in the pulley shaft seat 13 and contacts the pulley shaft 12. The instrument 3 includes a display screen 31 and a calculation unit 32. The calculation unit 32 is electrically connected to the first sensor assembly 21, the second sensor assembly 22, and the display screen 31 respectively.

[0022] Furthermore, the sensor group 2 is provided on either side of the pulley 11 or on both the left and right sides simultaneously, and the second sensor assembly 22 is provided in the pulley shaft seat 13 or integrated on the pulley shaft 12 to obtain data on the user's pulling force by directly detecting the pulley shaft 12.

[0023] As Figure 3As shown in the figure, a method for calculating the power of a rowing machine includes the following steps: obtaining the angular velocity ω and time t of the pulley through the first sensor assembly 21 on the pulley 11; calculating the speed v of the cable according to the obtained angular velocity ω, time t, and the diameter d of the pulley; obtaining the pressure data F through the second sensor assembly 22 on the pulley shaft 12, that is, the component of the user's pulling force in the direction of the cable; and calculating the real-time power P of the user's rowing action based on the obtained speed v and pressure data F. It is clear that the angular velocity ω and time data t of the pulley are obtained by means of the first sensor assembly 21, and then the cable speed v is calculated in combination with the diameter d of the pulley; at the same time, the pressure F data of the pulley shaft 12 is collected by using the second sensor assembly 22; based on the speed v, pressure data F, and proportionality coefficient k, the real-time power P of the user's rowing action is obtained, and the calculation formula is: , where k is the proportionality coefficient. When the rowing machine is a double-wheel rowing machine and the sensor group is set on the single-side support frame, k is 2; when the sensor group is set on the support frames on both sides at the same time, k is 1.

[0024] As Figure 4 shown in the figure, the pulley shaft seat 13 is convex, and the pulley shaft 12 is arranged on the protruding part inside the pulley shaft seat 13. The protruding part inside the pulley shaft seat 13 supports the pulley shaft 12 to ensure its stable installation and restrict the movement of the pulley shaft 12 in an unexpected direction.

[0025] As Figure 4 , Figure 5 shown in the figure, the first sensor assembly 21 includes a plurality of magnets 211 and a first sensor 212. The magnets 211 are evenly distributed on the side surface of the pulley, and the first sensor 212 is arranged inside the support frame 1. The first sensor 212 uses a magnetic field sensor. The plurality of magnets 211 evenly distributed on the side surface of the pulley cooperate with the first sensor 212 arranged inside the pulley shaft seat 13. The magnetic field sensor 212 will continuously sense the change of the surrounding magnetic field, and can accurately obtain the angular velocity and time t data of the pulley, providing a basis for calculating the cable speed subsequently. The second sensor assembly 22 using a pressure sensor can directly detect the radial pressure data F received by the pulley shaft 12. The accurate collection of these data lays a foundation for calculating the real-time power P of the user's rowing action, ensuring that the power meter can effectively monitor the user's motion state.

[0026] When the pulley rotates, the magnet 211 will rotate along with it, and the evenly distributed magnets 211 will pass by the magnetic field sensor 212 in turn. Each time a magnet passes by, the magnetic field around the magnetic field sensor 212 will change significantly. The magnetic field sensor 212 can convert this magnetic field change into a change in the electrical signal and output a pulse signal. Therefore, when the pulley rotates one full circle, the number of pulse signals output by the magnetic field sensor 212 is equal to the number of magnets 211. The calculation unit 32 can record the number n of the pulse signals and the time interval Δt. The number of pulse signals output by the magnetic field sensor 212 is n, and the number of evenly distributed magnets on the pulley is N. The calculation formula for the angular velocity of the pulley is: , and the cable is wound around the pulley. When the pulley rotates, it will drive the cable to move. The linear velocity v of the cable, the angular velocity ω of the pulley, and the radius r of the pulley have the following relationship: .

[0027] Furthermore, the first sensor 212 is arranged inside the support frame 1 or integrated with the second sensor 22 inside the pulley shaft seat 13. The first sensor 212 uses a magnetic field sensor or an infrared optoelectronic sensor. When the first sensor 212 is an infrared optoelectronic sensor, the magnet 211 is replaced by a reflector. When the pulley rotates, the reflector 211 will rotate along with the pulley. Each time a reflector 211 passes in front of the infrared optoelectronic sensor 212, the infrared optoelectronic sensor 212 will receive a reflected infrared light signal once, and the infrared optoelectronic sensor 212 will output a pulse signal. When the pulley rotates one full circle, the number of pulse signals output by the infrared optoelectronic sensor 212 is equal to the number of reflectors 211.

[0028] Furthermore, the second sensor assembly 22 uses a contact pressure sensor or a tension sensor. Embodiment

[0029] As Figure 6 shown, the sensor group is arranged on the side of the pulley shaft 12 of the first pulley 15 at the upper end of the support frame 1. The pulley shaft seat 13 in the support frame 1 is arranged on the right side of the pulley shaft 12. The first sensor 212 is arranged inside the pulley shaft seat 13, and evenly distributed magnets 211 are arranged on the side of the first pulley 15. The second sensor assembly 22 is arranged vertically inside the pulley shaft seat 13, and one side of the second sensor assembly 22 is in contact with the pulley shaft 12.

[0030] When the user pulls the cable, the cable exerts a force on the first pulley 15, and the force on the pulley shaft 12 in the vertical direction is balanced by the support frame 1. The pulley shaft 12 is subjected to a pressure horizontally to the right, and this pressure is then applied to the second sensor assembly 22.

[0031] At this time, the first sensor 212 continuously collects data on the angular velocity ω and time t of the pulley, and the formula is . According to the obtained angular velocity ω, the calculation unit 32 uses the relational formula between the linear velocity v and the angular velocity ω: (where r is the radius of the pulley, which is a known fixed value in this rowing machine), and combines different times t to calculate the linear velocity v of the cable at different moments. At the same time, the second sensor assembly 22 converts the sensed pressure into an electrical signal and transmits it to the calculation unit 32, and the pulling force F is obtained through conversion. The calculation unit 32 uses the power calculation formula: , multiplies the proportionality coefficient k, the pulling force F, and the cable velocity v to obtain the real-time power P of the user rowing the boat, and displays it on the display screen 31.

[0032] Embodiment 2: As Figure 7 shown, the sensor group is arranged on the side of the pulley shaft 12 of the first pulley 15 at the upper end of the support frame 1, and the pulley shaft seat 13 in the support frame 1 is arranged below the pulley shaft 12. The first sensor 212 is arranged in the pulley shaft seat 13, and magnets 211 are evenly distributed on the side of the first pulley 15. The second sensor assembly 22 is horizontally arranged in the pulley shaft seat 13 and is connected to the pulley shaft 12 at one end.

[0033] When the user pulls the cable, the cable exerts a force on the first pulley 15, and the force on the pulley shaft 12 in the horizontal direction is balanced by the support frame 1. The pulley shaft 12 is subjected to a radial pressure vertically downward, and this pressure is transmitted to the second sensor assembly 22.

[0034] Further, when the second sensor assembly 22 is arranged below the pulley shaft 12, the first pulley 15 and its pulley shaft 12 will apply their own gravity G to the second sensor assembly 22. At this time, when the calculation unit 32 obtains the user's pulling force F, the pulling force will be corrected.

[0035] At this time, the first sensor 212 continuously collects data on the angular velocity ω and time t of the pulley, and the formula is: . According to the obtained angular velocity ω and time t, the calculation unit 32 uses the relational formula between the linear velocity v and the angular velocity ω: (where r is the radius of the pulley, which is a known fixed value in this rowing machine), the linear velocity v of the cable at different times is calculated by combining with the time t. At the same time, the second sensor assembly 22 converts the sensed pressure into an electrical signal and transmits it to the calculation unit 32. After conversion, the pulling force F is obtained, where the second sensor assembly 22 detects the pressure data and converts it into the pulling force F 测 After that, the calculation unit 32 performs gravity correction on F 测 That is, F = F 测 - G. The calculation unit 32 uses the power calculation formula: At this time, the proportionality coefficient k is 2. The proportionality coefficient k, the pulling force F, and the cable velocity v are multiplied to obtain the real-time power P of the user rowing and displayed on the display screen 31.

[0036] Embodiment 3: As shown in Fig. 8, the sensor group is installed on the side of the pulley shaft 12 of the second pulley 16 at the lower end of the support frame 1, and the pulley shaft seat 13 is arranged on the right side of the pulley shaft 12. The first sensor 212 is arranged in the pulley shaft seat 13, and magnets 211 are evenly arranged on the side of the second pulley 16. The second sensor assembly 22 is arranged vertically in the pulley shaft seat 13 and is in contact with the pulley shaft 12 on one side.

[0037] When the user pulls the cable, the cable exerts a force on the first pulley 15. The first pulley 15 changes the direction of the force on the cable but does not change the magnitude of the force. At this time, the force directions of the cables on both sides of the second pulley 16 are vertically upward and horizontally to the right respectively. The cable exerts the same magnitude of force on the second pulley 16. The force on the pulley shaft 12 in the vertical direction is balanced by the support frame 1, and the pulley shaft 12 receives a radial pressure horizontally to the right, and this pressure is applied to the second sensor assembly 22.

[0038] At this time, the first sensor 212 continuously collects the angular velocity ω of the pulley and the time t data, and the calculation formula is . The calculation unit 32 uses the relationship formula between the linear velocity v and the angular velocity according to the obtained angular velocity ω and time t: (where r is the radius of the pulley, which is a known fixed value in this rowing machine), and combines with the time t to calculate the linear velocity v of the cable at different times. At the same time, the second sensor assembly 22 converts the sensed pressure into an electrical signal and transmits it to the calculation unit 32. After conversion, the pulling force F is obtained. The calculation unit 32 uses the power calculation formula: At this time, the proportionality coefficient k is 2. The proportionality coefficient k, the pulling force F, and the cable velocity v are multiplied to obtain the real-time power P of the user rowing and displayed on the display screen 31.

[0039] Embodiment 4: As shown in Figure 9, the sensor group is arranged on the side of the pulley shaft 12 of the second pulley 16 at the lower end of the support frame 1, and the pulley shaft seat 13 is arranged above the pulley shaft 12. The first sensor 212 is arranged inside the pulley shaft seat 13, and magnets 211 are evenly distributed on the side of the second pulley 16. The second sensor assembly 22 is horizontally arranged inside the pulley shaft seat 13 and one end thereof is in contact with the pulley shaft 12.

[0040] When the user pulls the cable, the cable exerts a force on the first pulley 15. The first pulley 15 changes the direction of the force on the cable but does not change the magnitude of the force. At this time, the force directions of the cables on both sides of the second pulley 16 are vertically upward and horizontally to the right respectively, and the cable exerts the same magnitude of force on the second pulley 16. The force on the pulley shaft 12 in the horizontal direction is balanced by the support frame 1, and the pulley shaft 12 receives a vertically upward radial pressure, and this pressure is transmitted to the second sensor assembly 22.

[0041] Further, the second sensor assembly 22 is arranged above the pulley shaft 12. The vertical pulling force F of the cable will first cancel out the gravity G of the second pulley 16 and its pulley shaft 12, and then exert a pressure on the second sensor assembly 22. At this time, when the calculation unit 32 obtains the user's pulling force F, it will correct the pulling force.

[0042] At this time, the first sensor 212 continuously collects the data of the angular velocity ω and time t of the pulley, and the calculation formula is: The calculation unit 32, according to the obtained angular velocity ω and time t, uses the relationship formula between linear velocity and angular velocity: (where r is the radius of the pulley, which is a known fixed value in this rowing machine), combines with the time t to calculate the linear velocity v of the cable at different times. At the same time, the second sensor assembly 22 converts the sensed pressure into an electrical signal and transmits it to the calculation unit 32. After conversion, the pulling force F is obtained. Since the pulling force F of the cable cancels out the gravity G of the second pulley 16 and its pulley shaft 12, the remaining force is applied to the second sensor assembly 22. The second sensor assembly 22 detects the pressure data and converts it into the pulling force F 测 After that, the calculation unit 32 corrects F 测 for gravity, that is, F = F 测 + G. The calculation unit 32 uses the power calculation formula: , at this time, the proportionality coefficient k is 2. Multiply the proportionality coefficient k, the pulling force F, and the cable speed v to obtain the real-time power P of the user rowing the boat, and display it on the display screen 31.

[0043] Embodiment Five: When the rowing machine adopts a single-wheel rowing machine, a pulley 11 is provided on the support frame 1. The sensor group 2 is arranged on the side of the pulley shaft 12 of the support frame 1. The pulley shaft seat 13 is arranged on the side of the pulley shaft 12. The first sensor 212 is arranged in the pulley shaft seat, and magnets 211 evenly distributed are arranged on the side of the pulley 11. The second sensor assembly 22 is arranged vertically in the pulley shaft seat 13, and one side of the second sensor assembly 22 is in contact with the pulley shaft 12.

[0044] When the user pulls the cable, the cable exerts a force on the first pulley 12. The force on the pulley shaft 12 in the vertical direction is balanced by the support frame 1, and the pulley shaft 12 receives a pressure horizontally to the right, and this pressure is then applied to the second sensor assembly 22.

[0045] At this time, the first sensor 212 continuously collects the angular velocity ω of the pulley and the time t data, and the calculation formula is . The calculation unit 32 uses the relationship formula between the linear velocity v and the angular velocity according to the obtained angular velocity ω: (where r is the radius of the pulley, which is a known fixed value in this rowing machine), and combines the time t to calculate the linear velocity v of the cable at different times. At the same time, the second sensor assembly 22 converts the felt pressure into an electrical signal and transmits it to the calculation unit 32, and the pulling force F is obtained through conversion. The calculation unit 32 uses the power calculation formula: , at this time, the value of the proportionality coefficient k is 0.5. Multiply the proportionality coefficient k, the pulling force F, and the cable speed v to obtain the real-time power P of the user rowing the boat, and display it on the display screen 31.

[0046] The above are only the preferred examples of the present application and are not used to limit the present application. For those skilled in the art, the present application can have other optimization schemes and additional functions. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A rowing machine power meter, characterized in that, It includes a support frame (1), a sensor group (2), and an instrument (3). The support frame (1) is arranged at the front end of the rowing machine. A pulley (11) is provided on the support frame (1). The pulley (11) is arranged on the support frame (1). A pulley shaft (12) is provided on the pulley (11). A pulley shaft seat (13) is provided on the support frame (1). A limit wheel (14) is arranged at the top of the support frame (1). The pulley shaft (12) is fixed in the pulley shaft seat (13). The sensor group (2) includes a first sensor assembly (21) and a second sensor assembly (22). The first sensor assembly (21) is arranged on the side of the pulley (11). The second sensor assembly (22) is arranged in the pulley shaft seat (13) and contacts the pulley shaft (12). The instrument (3) includes a display screen (31) and a calculation unit (32). The calculation unit (32) is electrically connected to the first sensor assembly (21), the second sensor assembly (22), and the display screen (31) respectively.

2. A method for calculating the power of a rowing machine, characterized in that, It includes the following steps: Obtain the angular velocity ω and time t of the pulley through the first sensor assembly (21) on the pulley (11); calculate the speed v of the cable according to the obtained angular velocity ω, time t, and the diameter d of the pulley; obtain the pressure data F through the second sensor assembly on the pulley shaft (12), that is, the component of the user's pulling force in the direction of the cable; calculate the real-time power P of the user's rowing action based on the obtained speed v, pressure data F, and proportionality coefficient k. The calculation formula is: P = kFv.

3. The rowing machine power meter according to claim 1, characterized in that, The pulley shaft seat (13) is convex, and the pulley shaft (12) is arranged on the protruding part inside the pulley shaft seat (13).

4. The rowing machine power meter according to claim 3, characterized in that, The first sensor assembly (21) includes several magnets (211) and a first sensor (212). The magnets (211) are evenly distributed on the side of the pulley. The first sensor (212) is arranged inside the support frame (1). The first sensor (212) uses a magnetic field sensor.

5. The rowing machine power meter according to claim 1, characterized in that, When the rowing machine is a single-wheel rowing machine, the sensor assembly (2) is arranged on the side of the pulley shaft (12) of the pulley (11) on the support frame (1). The pulley shaft seat (13) is arranged on the side of the pulley shaft (12). The second sensor assembly (22) is arranged vertically inside the pulley shaft seat (13). The second sensor assembly (22) contacts the pulley shaft (12).

6. The rowing machine power meter according to claim 1, characterized in that, When the rowing machine is a double-wheel rowing machine, the pulley (11) includes a first pulley (15) and a second pulley (16). The first pulley (15) is arranged at the upper end of the support frame (1). The second pulley (16) is arranged below the first pulley (15).

7. The rowing machine power meter according to claim 6, wherein, The sensor assembly (2) is arranged on the side of the pulley shaft (12) of the first pulley (15) at the upper end of the support frame (1). The pulley shaft seat (13) is arranged on the side of the pulley shaft (12). The second sensor assembly (22) is arranged vertically inside the pulley shaft seat (13). The second sensor assembly (22) contacts the pulley shaft (12).

8. The rowing machine power meter according to claim 6, wherein The sensor assembly (2) is disposed on the side of the pulley shaft (12) of the first pulley (15) at the upper end of the support frame (1). The pulley shaft seat (13) is disposed below the pulley shaft (12). The second sensor assembly (22) is horizontally disposed in the pulley shaft seat (13), and the second sensor assembly (22) is in contact with the pulley shaft (12).

9. The rowing machine power meter according to claim 6, wherein, The sensor assembly (2) is disposed on the side of the pulley shaft (12) of the second pulley (16) at the lower end of the support frame (1). The pulley shaft seat (13) is disposed on the side of the pulley shaft (12). The second sensor assembly (22) is vertically disposed in the pulley shaft seat (13), and the second sensor assembly (22) is in contact with the pulley shaft (12).

10. The rowing machine power meter according to claim 6, wherein The sensor assembly (2) is disposed on the side of the pulley shaft (12) of the second pulley (16) at the lower end of the support frame (1). The pulley shaft seat (13) is disposed above the pulley shaft (12). The second sensor assembly (22) is horizontally disposed in the pulley shaft seat (13), and the second sensor assembly (22) is in contact with the pulley shaft (12).

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