A propeller push-pull force measuring device and method

Abstract

The present invention belongs to the technical field of ships, and discloses a propeller push-pull force measuring device and method, wherein the propeller push-pull force measuring device comprises a transom fixing frame, a propeller mounting frame, a support frame, a dynamometer connecting frame, a first dynamometer and a second dynamometer, wherein the transom fixing frame is detachably connected to the transom of the ship, the propeller mounting frame is detachably connected to the propeller, the propeller mounting frame is rotatably connected to the support frame, the dynamometer connecting frame is fixedly connected to the support frame, and is rotatably connected to the transom fixing frame, one end of the first dynamometer is connected to the dynamometer connecting frame, and the other end is connected to the transom fixing frame, one end of the second dynamometer is connected to the dynamometer connecting frame, and the other end is connected to the propeller mounting frame, and the propeller push-pull force measuring method uses the above-mentioned propeller push-pull force measuring device. The present invention can perform moment balance calculation based on the first dynamometer and the second dynamometer according to the principle of lever, and can obtain the thrust or pull of the propeller without re-measuring when the propeller is replaced.

Description

Technical Field

[0001] The present invention relates to the field of ship technology, and in particular to a propeller push-pull force measuring device and method. Background Art

[0002] A marine propeller is a device that provides propulsion power to boats. During the research and development process of the marine propeller, it is necessary to measure the propulsion force provided by the marine propeller. The propeller that provides thrust is connected to the bottom of the propeller.

[0003] The propeller works underwater, and high-precision dynamometers are generally not waterproof, so the dynamometer needs to be placed on the water for testing. There are two existing methods for testing propulsion force. One is based on the principle of leverage, by measuring the distance from the center of the propeller to the fulcrum and the distance from the center of the dynamometer to the fulcrum, the thrust is calculated. This method will introduce a lever arm measurement error, because the actual thrust center is always deviated from the ideal thrust center due to manufacturing errors, resulting in low measurement accuracy, and the measurement of the lever arm length is also difficult to carry out. Every time a propeller is replaced, the lever arm length always needs to be remeasured, and the measurement operation is time-consuming and laborious. Another measurement method is to measure through a slide rail and a dynamometer, but due to the friction of the slide rail, the measurement accuracy is not high. Summary of the invention

[0004] The object of the present invention is to provide a propeller push-pull force measuring device and method to solve the technical problems of low measurement accuracy and time-consuming and labor-intensive measurement operation in the prior art.

[0005] As conceived above, the technical solution adopted by the present invention is:

[0006] A propeller push-pull force measuring device, wherein the propeller is arranged on a propeller and is used to propel a ship to run, comprising:

[0007] A transom fixing bracket, detachably connected to the transom of the boat;

[0008] A propeller mounting frame, detachably connected to the propeller;

[0009] A support frame, the thruster mounting frame being rotatably connected to the support frame;

[0010] A dynamometer connecting frame, the dynamometer connecting frame is fixedly connected to the supporting frame and rotatably connected to the transom fixing frame;

[0011] a first dynamometer, one end of which is connected to the dynamometer connecting frame, and the other end of which is connected to the transom fixing frame;

[0012] A second dynamometer has one end connected to the dynamometer connecting frame and the other end connected to the thruster mounting frame.

[0013] Preferably, it further comprises a first connecting portion, and the thruster mounting frame is rotatably connected to the supporting frame via the first connecting portion.

[0014] Preferably, two first connecting parts are provided, and the two first connecting parts are respectively located on both sides of the bottom end of the thruster mounting frame.

[0015] Preferably, it further comprises a second connecting portion, and the dynamometer connecting frame is rotatably connected to the transom fixing frame via the second connecting portion.

[0016] Preferably, the first dynamometer is connected to the dynamometer connecting frame and / or the transom fixing frame via a first fixing component, and the length of the first fixing component is adjustable.

[0017] Preferably, the second dynamometer is connected to the dynamometer connecting frame and / or the thruster mounting frame via a second fixing component, and the length of the second fixing component is adjustable.

[0018] Preferably, the first fixing assembly and the second fixing assembly have the same structure, the first fixing assembly comprises a rod end joint bearing, the rod end of the rod end joint bearing is threadedly connected to the end of the first dynamometer, and the bearing end of the rod end joint bearing is rotatably connected to the dynamometer connecting frame or the stern plate fixing frame.

[0019] Preferably, a propeller clamp is further included, and the propeller clamp is used to connect the propeller and the propeller mounting frame.

[0020] Preferably, a transom clamping piece is further included, and the transom clamping piece is used to connect the transom fixing frame and the transom.

[0021] Preferably, a control device is further included, and the control device is communicatively connected to the thruster.

[0022] A propeller push-pull force measurement method, based on the above-mentioned propeller push-pull force measurement device, comprises:

[0023] Obtain a first distance, a second distance, and a third distance, wherein the connection point between the thruster mounting frame and the support frame is a first fulcrum, the connection point between the transom fixing frame and the dynamometer connecting frame is a second fulcrum, the first distance is a height difference between a center line of the first dynamometer and the second fulcrum, the second distance is a height difference between a center line of the second dynamometer and the first fulcrum, and the third distance is a height difference between the first fulcrum and the second fulcrum;

[0024] The propeller rotates to generate thrust or pull;

[0025] The first dynamometer displays a first measurement value, the first measurement value is the force generated by the dynamometer connecting frame on the first dynamometer, and the second dynamometer displays a second measurement value, the second measurement value is the force generated by the thruster mounting frame on the second dynamometer;

[0026] The thrust or pull of the propeller is calculated. According to the lever principle, the thrust or pull of the propeller is expressed as follows:

[0027] F0 = (F1 × L1 - F2 × L2) / L3;

[0028] Wherein, F0 is the thrust or pull of the propeller, F1 is the first measurement value, F2 is the second measurement value, L1 is the first distance, L2 is the second distance, and L3 is the third distance;

[0029] The rotation speed of the propeller is adjusted, the thrust or pull of the propeller is calculated, and a rotation speed thrust-pull curve of the propeller is obtained according to the rotation speed value and the thrust or pull value of the propeller corresponding to the rotation speed value.

[0030] Preferably, before measuring with the first dynamometer and the second dynamometer, the connection distances between the two ends of the first dynamometer and the stern fixing frame and the dynamometer connecting frame, as well as the connection distances between the two ends of the second dynamometer and the propeller mounting frame and the dynamometer connecting frame are adjusted, so that the axis of the first dynamometer, the axis of the second dynamometer and the rotation axis of the propeller are all parallel to the horizontal plane.

[0031] Preferably, the thruster mounting frame is rotatably connected to the support frame via a first connecting portion, and the first fulcrum is located on the axis of the first connecting portion;

[0032] The dynamometer connecting frame is rotatably connected to the transom fixing frame via a second connecting portion, and the second fulcrum is located on the axis of the second connecting portion.

[0033] Beneficial effects of the present invention:

[0034] The propeller push-pull force measuring device of the present invention has a transom fixing frame connected to the transom of the ship, a propeller mounting frame connected to the propeller, a support frame and a dynamometer connecting frame realize the connection between the propeller mounting frame and the transom fixing frame, and since the propeller is connected to the propeller mounting frame, the propeller and the propeller mounting frame can be regarded as a whole, and since the propeller mounting frame is rotatably connected to the support frame, the rotation connection between the propeller mounting frame and the support frame can be used as a fulcrum, and the connection between the second dynamometer and the propeller mounting frame and the rotation axis of the propeller are two force applying points. Point, according to the principle of lever, the moment balance calculation is performed, because the dynamometer connecting frame and the stern plate fixing frame are rotatably connected, the rotation connection between the dynamometer connecting frame and the stern plate fixing frame can be used as a fulcrum, the connection between the first dynamometer and the dynamometer connecting frame and the rotation axis of the propeller are two force application points, according to the principle of lever, the moment balance calculation is performed, and the thrust or pull of the propeller can be obtained by combining the moment balance calculations at the above two points. There is no need to re-measure when replacing the propeller, the operation is time-saving and labor-saving, there is no need to use a slide rail, there is no friction effect, and the measurement accuracy is high.

[0035] The propeller push-pull force measurement method of the present invention can calculate the propeller thrust or pull through the lever principle according to the measurement values ​​displayed by the first dynamometer and the second dynamometer and the measured first distance, second distance and third distance, and has high measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a structural schematic diagram of a propeller push-pull force measuring device provided in an embodiment of the present invention;

[0037] Figure 2 It is a partial structural schematic diagram of a propeller push-pull force measuring device provided in an embodiment of the present invention;

[0038] Figure 3 It is a measurement principle diagram of a propeller push-pull force measurement device provided in an embodiment of the present invention.

[0039] In the figure:

[0040] 10. propeller; 20. thruster; 30. stern plate; 40. horizontal plane;

[0041] 1. Transom fixing frame; 11. First vertical support frame; 12. Horizontal support frame; 13. Second vertical support frame;

[0042] 2. Thruster mounting frame;

[0043] 3. Support frame;

[0044] 4. Dynamometer connecting frame;

[0045] 5. First dynamometer;

[0046] 6. Second dynamometer;

[0047] 71, first connecting portion; 711, first rotating shaft; 712, first bearing assembly; 713, second bearing assembly; 72, second connecting portion;

[0048] 81. Thruster clamping piece; 82. Transom clamping piece;

[0049] 91. The first fulcrum; 92. The second fulcrum. DETAILED DESCRIPTION

[0050] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0051] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0053] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0054] See also Figures 1 to 3The propeller 10 is arranged on the propeller 20 and is used to propel the ship to run. The embodiment of the present invention provides a propeller push-pull force measuring device, including a transom fixing frame 1, a propeller mounting frame 2, a support frame 3, a dynamometer connecting frame 4, a first dynamometer 5 and a second dynamometer 6. Among them, the transom fixing frame 1 is detachably connected to the transom 30 of the ship, the propeller mounting frame 2 is detachably connected to the propeller 20, the propeller mounting frame 2 is rotatably connected to the support frame 3, the dynamometer connecting frame 4 is fixedly connected to the support frame 3, and is rotatably connected to the transom fixing frame 1, one end of the first dynamometer 5 is connected to the dynamometer connecting frame 4, and the other end is connected to the transom fixing frame 1, and one end of the second dynamometer 6 is connected to the dynamometer connecting frame 4, and the other end is connected to the propeller mounting frame 2.

[0055] In the present invention, the transom fixing frame 1 is connected to the transom 30 of the ship, the propeller mounting frame 2 is connected to the propeller 20, the support frame 3 and the dynamometer connecting frame 4 realize the connection between the propeller mounting frame 2 and the transom fixing frame 1, and since the propeller 20 is connected to the propeller mounting frame 2, the propeller 20 and the propeller mounting frame 2 can be regarded as a whole, and since the propeller mounting frame 2 is rotatably connected to the support frame 3, the rotation connection between the propeller mounting frame 2 and the support frame 3 can be used as a fulcrum, and the connection between the second dynamometer 6 and the propeller mounting frame 2 and the rotation axis of the propeller 10 are two dynamometers. The force point is calculated based on the principle of lever. Since the dynamometer connecting frame 4 is rotatably connected to the stern plate fixing frame 1, the rotation connection between the dynamometer connecting frame 4 and the stern plate fixing frame 1 can be used as a fulcrum. The connection between the first dynamometer 5 and the dynamometer connecting frame 4 and the rotation axis of the propeller 10 are two force application points. According to the principle of lever, the torque balance calculation is calculated. The thrust or pull of the propeller 10 can be obtained by combining the torque balance calculations at the above two points. There is no need to re-measure when replacing the propeller 20, which saves time and effort. There is no need to use slide rails, there is no friction effect, and the measurement accuracy is high.

[0056] Specifically, the bottom end of the thruster mounting frame 2 is rotatably connected to one end of the support frame 3; the bottom end of the dynamometer connecting frame 4 is fixedly connected to the other end of the support frame 3, and the dynamometer connecting frame 4 is rotatably connected to the stern fixing frame 1; one end of the first dynamometer 5 is connected to the top of the dynamometer connecting frame 4, and the other end is connected to the top of the stern fixing frame 1; one end of the second dynamometer 6 is connected to the dynamometer connecting frame 4, and the other end is connected to the top of the thruster mounting frame 2.

[0057] In this embodiment, the axis of the first dynamometer 5, the axis of the second dynamometer 6 and the rotation axis of the propeller 10 are parallel or approximately parallel to each other, so that the first dynamometer 5 and the second dynamometer 6 can perform measurements more reliably. Among them, the first dynamometer 5 and the second dynamometer 6 are existing dynamometers that indicate readings by tension and compression, and their specific structures and working principles are not repeated here.

[0058] See also Figure 1 The transom fixing frame 1 includes a first vertical support frame 11, a transverse support frame 12 and a second vertical support frame 13. The transverse support frame 12 is L-shaped, one end of which is connected to the middle and lower part of the first vertical support frame 11, and the other end is connected to the top of the second vertical support frame 13. The dynamometer connecting frame 4 is rotatably connected to the bottom end of the second vertical support frame 13. The top of the first vertical support frame 11 is connected to the first dynamometer 5 to support the first dynamometer 5. The transom 30 is located between the first vertical support frame 11 and the second vertical support frame 13. The overall structure of the transom fixing frame 1 is simple, which is convenient for installing the transom fixing frame 1 on the transom 30.

[0059] Specifically, the propeller push-pull force measuring device further includes a first connecting portion 71 , and the propeller mounting frame 2 is rotatably connected to the supporting frame 3 via the first connecting portion 71 .

[0060] More specifically, Figure 2 As shown, the first connecting portion 71 includes a first rotating shaft 711, a first bearing assembly 712 and a second bearing assembly 713. The first bearing assembly 712 is fixedly connected to the bottom end of the propeller mounting frame 2, and the second bearing assembly 713 is fixedly connected to the end of the support frame 3 close to the propeller mounting frame 2. The first bearing assembly 712 includes a first bearing seat and a first bearing, and the second bearing assembly 713 includes a second bearing seat and a second bearing. The first rotating shaft 711 is connected to the inner rings of the first bearing and the two second bearings. The structure is simple, and a rotational connection between the propeller mounting frame 2 and the support frame 3 is realized, so that the propeller mounting frame 2 rotates around the connection with the first rotating shaft 711 within a certain angle range, and the certain angle range is -10°-10°, including -10° and 10°.

[0061] In this embodiment, the certain angle range is -2°-2°, including -2° and 2°. A smaller certain angle range makes the measurement accuracy higher. Two first connecting parts 71 are provided, and the two first connecting parts 71 are respectively located on both sides of the bottom end of the thruster mounting frame 2, so that the rotational connection between the thruster mounting frame 2 and the support frame 3 is more balanced and reliable. In other embodiments, the first connecting parts 71 can also be other numbers.

[0062] Specifically, the propeller push-pull force measuring device further includes a second connecting portion 72 , and the dynamometer connecting frame 4 is rotatably connected to the transom fixing frame 1 via the second connecting portion 72 .

[0063] In this embodiment, the second connection portion 72 has the same structure as the first connection portion 71. In other embodiments, the first connection portion 71 and the second connection portion 72 may also adopt other structures such as hinge structures.

[0064] Optionally, the first dynamometer 5 is connected to the dynamometer connecting frame 4 and / or the stern fixing frame 1 via a first fixing component, and the length of the first fixing component is adjustable, thereby ensuring that the axis of the first dynamometer 5 is parallel or approximately parallel to the rotation axis of the propeller 10 and the horizontal plane 40.

[0065] Specifically, first fixing components are respectively provided at both ends of the first dynamometer 5, and are respectively connected to the dynamometer connecting frame 4 and the transom fixing frame 1 through the two first fixing components. In other embodiments, the connection length between the first dynamometer 5 and the dynamometer connecting frame 4 or between the first dynamometer 5 and the transom fixing frame 1 can be adjusted, that is, only the first fixing component needs to be provided at one end of the first dynamometer 5.

[0066] Optionally, the second dynamometer 6 is connected to the dynamometer connecting frame 4 and / or the propeller mounting frame 2 via a second fixing component, and the length of the second fixing component is adjustable, thereby ensuring that the axis of the second dynamometer 6 is parallel or approximately parallel to the rotation axis of the propeller 10 and the horizontal plane 40.

[0067] Specifically, the second fixing components are respectively provided at both ends of the second dynamometer 6, and are respectively connected to the dynamometer connecting frame 4 and the thruster mounting frame 2 through the two second fixing components. In other embodiments, the connection length between the second dynamometer 6 and the dynamometer connecting frame 4 or between the second dynamometer 6 and the thruster mounting frame 2 can also be adjusted, that is, only the second fixing component needs to be provided at one end of the second dynamometer 6.

[0068] More specifically, the first fixed component and the second fixed component have the same structure. The first fixed component includes a rod end joint bearing, the rod end of the rod end joint bearing is threadedly connected to the end of the first dynamometer 5, and the bearing end of the rod end joint bearing is rotatably connected to the dynamometer connecting frame 4 or the stern plate fixing frame 1. The second fixed component includes a rod end joint bearing, the rod end of the rod end joint bearing is threadedly connected to the end of the second dynamometer 6, and the bearing end of the rod end joint bearing is rotatably connected to the dynamometer connecting frame 4 and the thruster mounting frame 2.

[0069] More specifically, the first fixing assembly also includes a punch screw and two fixing plates, the two fixing plates are clamped on the dynamometer connecting frame 4 or the transom fixing frame 1, the bearing end of the rod end joint bearing is located between the two fixing plates, the punch screw is connected to the two fixing plates, and is penetrated in the bearing of the rod end joint bearing, thereby realizing the adjustment of the connection length between the first dynamometer 5 and the dynamometer connecting frame 4 or the transom fixing frame 1. The second fixing assembly also includes a punch screw and two fixing plates, the two fixing plates are clamped on the dynamometer connecting frame 4 or the thruster mounting frame 2, the bearing end of the rod end joint bearing is located between the two fixing plates, the punch screw is connected to the two fixing plates, and is penetrated in the bearing of the rod end joint bearing, thereby realizing the adjustment of the connection length between the second dynamometer 6 and the dynamometer connecting frame 4 or the thruster mounting frame 2.

[0070] In other embodiments, the first fixing component and the second fixing component can also be connecting rods with threads at both ends. Taking the first fixing component as an example, one end of the connecting rod is threadedly connected to the first dynamometer 5, and the other end is threadedly connected to the dynamometer connecting frame 4 or the transom fixing frame 1, thereby realizing the adjustment of the connection length.

[0071] In this embodiment, taking the connection between the first dynamometer 5 and the stern plate fixing frame 1 as an example, the rod end of the rod end joint bearing is threadedly connected to the end of the first dynamometer 5 close to the first vertical support frame 11, two fixing plates are clamped at the top of the first vertical support frame 11, and the bearing sleeve of the rod end joint bearing is installed on the two fixing plates with plug screws.

[0072] Optionally, the propeller push-pull force measuring device further comprises a propeller clamping member 81, which is used to connect the propeller 20 and the propeller mounting frame 2, and realizes the connection between the propeller 20 and the propeller mounting frame 2 by clamping, which is convenient for disassembly and assembly.

[0073] Specifically, the propeller clamping member 81 is disposed on the propeller 20 and can clamp and fix the top end of the propeller mounting frame 2 .

[0074] Optionally, the propeller push-pull force measuring device further comprises a transom clamping member 82, which is used to connect the transom fixing frame 1 and the transom 30, and realizes the connection between the transom fixing frame 1 and the transom 30 by clamping, which is convenient for disassembly and assembly.

[0075] Specifically, the transom clamp 82 is disposed at the bottom end of the first vertical support frame 11 and can clamp and fix the transom 30 .

[0076] In this embodiment, the transom clamp 82 has the same structure as the propeller clamp 81. Here, the propeller clamp 81 and the transom clamp 82 are described separately. The propeller clamp 81 includes a connecting handle and a clamping plate. An L-shaped connecting support plate is provided on the side of the propeller 20 away from the propeller 10. The connecting handle is threadedly connected to the connecting support plate. The end of the connecting handle is fixedly connected to the clamping plate. The connecting handle drives the clamping plate to push the propeller mounting frame 2 against the side wall of the propeller 20 away from the propeller 10, thereby clamping and fixing the propeller mounting frame 2. The transom clamp 82 includes a connecting handle and a clamping plate. The connecting handle is threadedly connected to the first vertical support frame 11. The end of the connecting handle is fixedly connected to the clamping plate. The connecting handle drives the clamping plate to push the transom 30 against the second vertical support frame 13, thereby clamping and fixing the transom 30.

[0077] More specifically, the thruster clamping member 81 also includes a connecting nut, which is fixedly connected to the connecting support plate, and the connecting handle is threadedly connected to the connecting nut and passed through the connecting support plate. The stern clamping member 82 also includes a connecting nut, which is fixedly connected to the first vertical support frame 11, and the connecting handle is threadedly connected to the connecting nut and passed through the first vertical support frame 11.

[0078] In this embodiment, two propeller clamps 81 and two transom clamps 82 are respectively provided, and the two propeller clamps 81 are arranged at intervals on the connecting support plate, so as to better clamp the propeller mounting frame 2 and make the connection more stable, and the two transom clamps 82 are arranged at intervals on the first vertical support frame 11, so as to better clamp the transom 30 and make the connection more stable.

[0079] Optionally, the propeller push-pull force measuring device also includes a control device, which is communicated with the propeller 20, and the control device is used to start, stop, speed and forward and reverse control of the motor of the propeller 20. The motor is connected to the propeller 10 to control the start, stop, speed and forward and reverse rotation of the propeller 10. The control device in this embodiment is specifically a remote control, and its specific structure and working principle will not be repeated here.

[0080] The embodiment of the present invention further provides a propeller push-pull force measurement method, based on the above-mentioned propeller push-pull force measurement device, comprising the following steps:

[0081] Step 1, obtain the first distance, the second distance and the third distance. The connection between the thruster mounting frame 2 and the support frame 3 is the first fulcrum 91, the connection between the stern fixing frame 1 and the dynamometer connecting frame 4 is the second fulcrum 92, the first distance is the height difference between the center line of the first dynamometer 5 and the second fulcrum 92, the second distance is the height difference between the center line of the second dynamometer 6 and the first fulcrum 91, and the third distance is the height difference between the first fulcrum 91 and the second fulcrum 92.

[0082] Step 2: The propeller 10 rotates to generate thrust or pull.

[0083] Step three, the first dynamometer 5 displays a first measurement value, which is the force generated by the dynamometer connecting frame 4 on the first dynamometer 5 , and the second dynamometer 6 displays a second measurement value, which is the force generated by the thruster mounting frame 2 on the second dynamometer 6 .

[0084] In this step, under the action of the thrust or tension of the propeller 10, the propeller 20 drives the propeller mounting frame 2 to rotate around the first fulcrum 91, generating a force on the second dynamometer 6 until the torque at the first fulcrum 91 reaches a balance. At the same time, the propeller 20 drives the dynamometer connecting frame 4 to rotate around the second fulcrum 92 through the propeller mounting frame 2 and the support frame 3, generating a force on the first dynamometer 5 until the torque at the second fulcrum 92 reaches a balance.

[0085] Step 4: Calculate the thrust or pull of the propeller 10. According to the lever principle, the relationship between the thrust or pull of the propeller 10 is:

[0086] F0 = (F1 × L1 - F2 × L2) / L3;

[0087] Among them, F0 is the thrust or pull of the propeller 10, F1 is the first measurement value, F2 is the second measurement value, L1 is the first distance, L2 is the second distance, and L3 is the third distance.

[0088] In this step, according to the lever principle, the first relational expression is obtained at the first fulcrum 91:

[0089] F0×L0=F2×L2;

[0090] Among them, F0 is the thrust or pull of the propeller 10, L0 is the fourth distance, the fourth distance is the height difference between the center line of the propeller 10 and the first fulcrum 91, F2 is the second measurement value, and L2 is the second distance.

[0091] According to the lever principle, the second relationship is obtained at the second fulcrum 92:

[0092] F0×(L0+L3)=F1×L1;

[0093] Among them, F1 is the first measurement value, L1 is the first distance, and L3 is the third distance.

[0094] The relationship between the thrust or pull of the propeller 10 is derived from the first relationship and the second relationship:

[0095] F0 = (F1 × L1 - F2 × L2) / L3;

[0096] The first measured value, the second measured value, the first distance, the second distance and the third distance are substituted into the relationship formula of the thrust or the pull of the propeller 10 to calculate the thrust or the pull of the propeller 10 .

[0097] Step 5: adjust the rotation speed of the propeller 10, calculate the thrust or pull of the propeller 10, and obtain the rotation speed thrust and pull curve of the propeller 10 according to the rotation speed value and the thrust or pull value of the propeller 10 corresponding to the rotation speed value.

[0098] The propeller push-pull force measurement method proposed in the embodiment of the present invention can calculate the thrust or pull of the propeller 10 through the lever principle based on the measurement values ​​displayed by the first dynamometer 5 and the second dynamometer 6 and the measured first distance, second distance and third distance, with high measurement accuracy.

[0099] Specifically, before measuring with the first dynamometer 5 and the second dynamometer 6, adjust the connection distances between the two ends of the first dynamometer 5 and the stern fixing frame 1 and the dynamometer connecting frame 4, as well as the connection distances between the two ends of the second dynamometer 6 and the propeller mounting frame 2 and the dynamometer connecting frame 4, so that the axis of the first dynamometer 5, the axis of the second dynamometer 6 and the rotation axis of the propeller 10 are all parallel or approximately parallel to the horizontal plane 40.

[0100] More specifically, the thruster mounting frame 2 is rotatably connected to the support frame 3 via the first connecting portion 71, the first fulcrum 91 is located on the axis of the first rotating shaft 711 of the first connecting portion 71, and the dynamometer connecting frame 4 is rotatably connected to the transom fixing frame 1 via the second connecting portion 72, and the second fulcrum 92 is located on the axis of the second rotating shaft of the second connecting portion 72.

[0101] The above embodiments are only to illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and modifications, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A propeller push-pull force measuring device, wherein a propeller (10) is arranged on a propeller (20) and is used to propel a ship, characterized in that: include: A transom fixing frame (1) detachably connected to a transom (30) of a ship; A propeller mounting frame (2) detachably connected to the propeller (20); A support frame (3), the thruster mounting frame (2) being rotatably connected to the support frame (3); A dynamometer connecting frame (4), the dynamometer connecting frame (4) is fixedly connected to the supporting frame (3) and is rotatably connected to the transom fixing frame (1); A first dynamometer (5), one end of which is connected to the dynamometer connecting frame (4) and the other end of which is connected to the transom fixing frame (1); A second dynamometer (6) has one end connected to the dynamometer connecting frame (4) and the other end connected to the thruster mounting frame (2).

2. The propeller push-pull force measuring device according to claim 1, characterized in that: It also comprises a first connection portion (71), and the thruster mounting frame (2) is rotatably connected to the support frame (3) via the first connection portion (71).

3. The propeller push-pull force measuring device according to claim 2, characterized in that: Two first connection parts (71) are provided, and the two first connection parts (71) are respectively located on both sides of the bottom end of the thruster mounting frame (2).

4. The propeller push-pull force measuring device according to claim 1, characterized in that: It also comprises a second connecting portion (72), and the dynamometer connecting frame (4) is rotatably connected to the transom fixing frame (1) via the second connecting portion (72).

5. The propeller push-pull force measuring device according to claim 1, characterized in that: The first dynamometer (5) is connected to the dynamometer connecting frame (4) and / or the transom fixing frame (1) via a first fixing component, and the length of the first fixing component is adjustable.

6. The propeller push-pull force measuring device according to claim 5, characterized in that: The second dynamometer (6) is connected to the dynamometer connecting frame (4) and / or the thruster mounting frame (2) via a second fixing component, and the length of the second fixing component is adjustable.

7. The propeller push-pull force measuring device according to claim 6, characterized in that: The first fixing assembly and the second fixing assembly have the same structure. The first fixing assembly comprises a rod end joint bearing, the rod end of the rod end joint bearing is threadedly connected to the end of the first dynamometer (5), and the bearing end of the rod end joint bearing is rotatably connected to the dynamometer connecting frame (4) or the transom fixing frame (1).

8. The propeller push-pull force measuring device according to any one of claims 1 to 7, characterized in that: It also includes a propeller clamping piece (81), and the propeller clamping piece (81) is used to connect the propeller (20) and the propeller mounting frame (2).

9. The propeller push-pull force measuring device according to any one of claims 1 to 7, characterized in that: It also includes a transom clamping piece (82), and the transom clamping piece (82) is used to connect the transom fixing frame (1) and the transom (30).

10. The propeller push-pull force measuring device according to any one of claims 1 to 7, characterized in that: It also includes a control device, which is communicatively connected to the propeller (20).

11. A method for measuring propeller push and pull force, characterized in that: The propeller push-pull force measuring device according to any one of claims 1 to 10 comprises: Obtaining a first distance, a second distance and a third distance, wherein the connection point between the thruster mounting frame (2) and the support frame (3) is a first fulcrum (91), the connection point between the transom fixing frame (1) and the dynamometer connecting frame (4) is a second fulcrum (92), the first distance is a height difference between a center line of the first dynamometer (5) and the second fulcrum (92), the second distance is a height difference between a center line of the second dynamometer (6) and the first fulcrum (91), and the third distance is a height difference between the first fulcrum (91) and the second fulcrum (92); The propeller (10) rotates to generate thrust or pulling force; The first dynamometer (5) displays a first measurement value, the first measurement value being the force generated by the dynamometer connecting frame (4) on the first dynamometer (5), and the second dynamometer (6) displays a second measurement value, the second measurement value being the force generated by the thruster mounting frame (2) on the second dynamometer (6); The thrust or pull of the propeller (10) is calculated. According to the lever principle, the thrust or pull of the propeller (10) is expressed as: F0 = (F1 × L1 - F2 × L2) / L3; Wherein, F0 is the thrust or pull of the propeller (10), F1 is the first measurement value, F2 is the second measurement value, L1 is the first distance, L2 is the second distance, and L3 is the third distance; The rotation speed of the propeller (10) is adjusted, the thrust or pull of the propeller (10) is calculated, and a rotation speed thrust-pull curve of the propeller (10) is obtained according to the rotation speed value and the thrust or pull value of the propeller (10) corresponding to the rotation speed value.

12. The propeller push-pull force measurement method according to claim 11, characterized in that: Before measuring by the first dynamometer (5) and the second dynamometer (6), the connection distances between the two ends of the first dynamometer (5) and the transom fixing frame (1) and the dynamometer connecting frame (4), as well as the connection distances between the two ends of the second dynamometer (6) and the propeller mounting frame (2) and the dynamometer connecting frame (4) are adjusted, so that the axis of the first dynamometer (5), the axis of the second dynamometer (6) and the rotation axis of the propeller (10) are all parallel to the horizontal plane (40).

13. The propeller push-pull force measurement method according to claim 11, characterized in that: The thruster mounting frame (2) is rotatably connected to the support frame (3) via a first connecting portion (71), and the first fulcrum (91) is located on the axis of the first connecting portion (71); The dynamometer connecting frame (4) is rotatably connected to the transom fixing frame (1) via a second connecting portion (72), and the second fulcrum (92) is located on the axis of the second connecting portion (72).

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