A propeller thrust and pull force measuring device and method

Abstract

The present invention belongs to the technical field of ships, and discloses a propeller thrust and pull force measuring device and method. The propeller thrust and pull force measuring device comprises a stern plate fixing frame, a thruster mounting frame, a supporting part and a dynamometer. The stern plate fixing frame is detachably connected to the stern plate of the ship. The marine thruster is connected to the thruster mounting frame. One end of the supporting part is fixedly connected to the stern plate fixing frame, and the other end is rotatably connected to the thruster mounting frame. One end of the dynamometer is connected to the stern plate fixing frame, and the other end is connected to the thruster mounting frame. The propeller thrust and pull force measuring method uses the above-mentioned propeller thrust and pull force measuring device. The present invention can, according to the lever principle, perform moment balance calculation based on the dynamometer to obtain the thrust or pull force of the propeller, without using a slide rail, without the influence of friction, and has high measurement accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of ships, and particularly to a device and method for measuring the thrust and pull force of a propeller. Background Art

[0002] The propeller of a marine propeller is connected to the bottom of the marine propeller and operates underwater. Generally, a dynamometer with high precision is not waterproof. If it is necessary to measure the thrust or pull force of the propeller, the dynamometer needs to be set on the water, and the measurement is achieved by connecting the propeller of the marine propeller and the dynamometer through a measuring device.

[0003] Currently, the thrust and pull force of the propeller of a marine propeller are generally measured through a slide rail and a dynamometer. However, since there is friction when the marine propeller slides on the slide rail, the friction has a certain influence on the measurement accuracy of the thrust and pull force of the propeller, resulting in low measurement accuracy. Summary of the Invention

[0004] The purpose of the present invention is to provide a device and method for measuring the thrust and pull force of a propeller to solve the technical problem of low measurement accuracy existing in the prior art.

[0005] As such a concept, the technical solution adopted by the present invention is as follows:

[0006] A device for measuring the thrust and pull force of a propeller, the propeller is arranged on a marine propeller for pushing the ship to run, and includes:

[0007] A stern plate fixing frame detachably connected to the stern plate of the ship;

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

[0009] A support part, one end of which is fixedly connected to the stern plate fixing frame, and the other end is rotatably connected to the propeller mounting frame;

[0010] A dynamometer, one end of which is connected to the stern plate fixing frame, and the other end is connected to the propeller mounting frame.

[0011] Preferably, the support part is rotatably connected to the propeller mounting frame through a connecting part.

[0012] Preferably, the connecting part includes a rotating shaft and a bearing assembly. One end of the propeller mounting frame is sleeved and connected to the rotating shaft. The bearing assembly includes a bearing and a bearing seat. The outer ring of the bearing is fixedly connected inside the bearing seat. The rotating shaft is fixedly connected to the inner ring of the bearing, and the bearing seat is fixedly connected to the support part.

[0013] Preferably, the dynamometer is connected to the propeller mounting frame and / or the stern plate fixing frame through a fixing component, and the length of the fixing component is adjustable.

[0014] Preferably, the fixing component includes a rod end spherical bearing, the rod end thread of the rod end spherical bearing is connected to the end of the dynamometer, and the bearing end of the rod end spherical bearing is rotatably connected to the thruster mounting bracket or the stern plate fixing bracket.

[0015] Preferably, the stern plate fixing bracket includes a first vertical frame body, the supporting portion is fixedly connected to one end of the first vertical frame body, and the dynamometer is connected to the other end of the first vertical frame body.

[0016] Preferably, the supporting portion includes an outer frame and a first diagonal support frame. The bottom end of the first vertical frame body is fixedly connected to the outer frame. The first diagonal support frame is inclined. One end of the first diagonal support frame is fixedly connected to the outer frame, and the other end is fixedly connected to the first vertical frame body.

[0017] A method for measuring the thrust and pull force of a propeller, based on the above-mentioned propeller thrust and pull force measuring device, includes:

[0018] Obtain a first distance and a second distance. The connection point between the thruster mounting bracket and the supporting portion is used as a fulcrum. The first distance is the height difference from the axis of the dynamometer to the fulcrum, and the second distance is the height difference from the fulcrum to the rotation axis of the propeller;

[0019] The propeller rotates to generate thrust or pull force;

[0020] The dynamometer displays a measured value, and the measured value is the force generated by the thruster mounting bracket on the dynamometer;

[0021] Calculate the thrust or pull force of the propeller. According to the lever principle, the relational expression for the thrust or pull force of the propeller is:

[0022] F2 = (F1 × L1) / L2;

[0023] Wherein, F2 is the thrust or pull force of the propeller, F1 is the measured value of the dynamometer, L1 is the first distance, and L2 is the second distance;

[0024] Adjust the rotational speed of the propeller, calculate the thrust or pull force of the propeller, and obtain the rotational speed - thrust / pull force curve of the propeller according to the rotational speed value and the corresponding thrust or pull force value of the propeller.

[0025] Preferably, before measuring through the dynamometer, adjust the connection distance between the two ends of the dynamometer and the stern plate fixing bracket and the thruster mounting bracket, so that the axis of the dynamometer and the rotation axis of the propeller are both parallel to the horizontal plane.

[0026] Preferably, the support part is rotatably connected to the thruster mounting bracket through the connecting part, and the fulcrum is located on the axis of the connecting part.

[0027] Advantages of the present invention:

[0028] In the present invention, by connecting the stern plate fixing bracket to the stern plate and connecting the thruster mounting bracket to the marine thruster, the connection between the marine thruster and the stern plate is realized. Since the thruster mounting bracket is rotatably connected to the support part and the dynamometer is connected between the stern plate fixing bracket and the thruster mounting bracket, according to the lever principle, taking the rotational connection point between the thruster mounting bracket and the support part as the fulcrum, and the connection point between the dynamometer and the thruster mounting bracket and the rotational axis of the propeller as the two force application points, moment balance calculation can be carried out to obtain the thrust or pull force of the propeller, without the use of a slide rail, without the influence of friction, and with high measurement accuracy. Description of the drawings

[0029] Figure 1 is a schematic structural diagram of a propeller thrust and pull force measuring device provided by an embodiment of the present invention;

[0030] Figure 2 is Figure 1 an enlarged view of part A in

[0031] Figure 3 is a measurement principle diagram of a propeller thrust and pull force measuring method provided by an embodiment of the present invention.

[0032] In the figure:

[0033] 10, propeller; 20, marine thruster; 30, stern plate; 40, horizontal plane;

[0034] 1, stern plate fixing bracket; 11, first vertical frame body; 12, second vertical frame body; 13, first horizontal frame body; 14, connecting frame;

[0035] 2, thruster mounting bracket;

[0036] 3, support part; 31, outer frame; 32, first diagonal support frame; 33, first fixing frame;

[0037] 4, dynamometer;

[0038] 5, connecting part; 51, rotating shaft; 52, bearing assembly;

[0039] 6, thruster connection assembly; 61, connecting sleeve; 62, thruster clamping handle;

[0040] 71, first fixing component; 711, first rod end spherical bearing; 712, first set screw; 713, first fixing plate;

[0041] 72. Second fixing component; 721. Second rod end spherical bearing; 722. Second fixing plate

[0042] 8. Stern plate clamping handle assembly; 81. Connecting handle; 82. Connecting nut; 83. Clamping plate Detailed implementation manners

[0043] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention

[0044] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations

[0045] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under" and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature

[0046] The technical solution of the present invention will be further described below in conjunction with the drawings and through specific implementation manners

[0047] The propeller 10 is arranged on the marine propeller 20 and is used to push the ship to run. Refer to Figures 1 to 3 An embodiment of the present invention provides a propeller thrust and pull force measuring device, which includes a stern plate fixing frame 1, a propeller mounting frame 2, a supporting part 3 and a dynamometer 4. Among them, the stern plate fixing frame 1 is detachably connected to the stern plate 30 of the ship, the marine propeller 20 is connected to the propeller mounting frame 2, one end of the supporting part 3 is fixedly connected to the stern plate fixing frame 1, and the other end is rotatably connected to the propeller mounting frame 2. One end of the dynamometer 4 is connected to the stern plate fixing frame 1, and the other end is connected to the propeller mounting frame 2

[0048] In the present invention, by connecting the stern plate fixing bracket 1 to the stern plate 30 and connecting the thruster mounting bracket 2 to the marine thruster 20, the connection between the marine thruster 20 and the stern plate 30 is achieved. Since the thruster mounting bracket 2 is rotatably connected to the support portion 3 and the dynamometer 4 is connected between the stern plate fixing bracket 1 and the thruster mounting bracket 2, according to the lever principle, with the rotational connection between the thruster mounting bracket 2 and the support portion 3 as the fulcrum and the connection between the dynamometer 4 and the thruster mounting bracket 2 and the rotational axis of the propeller 10 as the two force application points, moment balance calculation can be carried out to obtain the thrust or pull force of the propeller 10. There is no need to use a slide rail, there is no influence of friction, and the measurement accuracy is high.

[0049] Specifically, one end of the dynamometer 4 is connected to the top of the stern plate fixing bracket 1, and the other end is connected to the top of the thruster mounting bracket 2. The dynamometer 4 is parallel or approximately parallel to the rotational axis of the propeller 10. The dynamometer 4 is an existing dynamometer that shows the value through tension and compression, and its specific structure and working principle will not be elaborated here.

[0050] In this embodiment, as Figure 1 shown, the stern plate fixing bracket 1 includes a first vertical frame body 11, a second vertical frame body 12, a first horizontal frame body 13, and two connecting frames 14. Among them, the support portion 3 is fixedly connected to the bottom end of the first vertical frame body 11, the dynamometer 4 is connected to the top end of the first vertical frame body 11, one end of the first horizontal frame body 13 is fixedly connected to the top end of the first vertical frame body 11, and the other end is fixedly connected to the top end of the second vertical frame body 12. The two connecting frames 14 are arranged at intervals and are connected to the inner side of the second vertical frame body 12. One end of the stern plate 30 is located between the first vertical frame body 11 and the second vertical frame body 12.

[0051] Specifically, the support portion 3 includes an outer frame 31, a first diagonal support frame 32, and a first fixing frame 33. The bottom end of the first vertical frame body 11 is fixedly connected to the outer frame 31. The first diagonal support frame 32 is inclined. One end of the first diagonal support frame 32 is fixedly connected to the outer frame 31, and the other end is fixedly connected to the first vertical frame body 11. The first fixing frame 33 is arranged in the middle of the outer frame 31. The first diagonal support frame 32 strengthens the stability of the connection between the outer frame 31 and the first vertical frame body 11 and ensures the strength of the connection between the stern plate fixing bracket 1 and the support portion 3.

[0052] In this embodiment, there are four first diagonal support frames 32, and two first diagonal support frames 32 are respectively connected to both sides of the first vertical frame body 11.

[0053] Specifically, the support portion 3 is rotatably connected to the thruster mounting bracket 2 through the connecting portion 5.

[0054] More specifically, referring to Figure 1, the connecting part 5 includes a rotating shaft 51 and a bearing assembly 52. One end of the thruster mounting bracket 2 is sleeved and connected to the rotating shaft 51. The bearing assembly 52 includes a bearing and a bearing seat. The outer ring of the bearing is fixedly connected inside the bearing seat, the rotating shaft 51 is fixedly connected to the inner ring of the bearing, and the bearing seat is fixedly connected to the outer frame 31 of the support part 3. By setting the bearing, the rotation of the thruster mounting bracket 2 relative to the support part 3 is smoother. Based on the rotating shaft 51, the bearing and the bearing seat cooperate with each other, with a simple structure, small friction, and high load-bearing capacity.

[0055] More specifically, the thruster mounting bracket 2 rotates relative to the support part 3 within a certain angular range. The certain angular range is -10° - 10°, including -10° and 10°. Preferably, the certain angular range is -2° - 2°, including -2° and 2°. A smaller certain angular range results in higher measurement accuracy.

[0056] In this embodiment, there are two connecting parts 5, and the two connecting parts 5 are respectively located on both sides of the bottom end of the thruster mounting bracket 2. Setting two connecting parts 5 enables the thruster mounting bracket 2 to be more stably connected to the support part 3. In other embodiments, the number of connecting parts 5 can also be set to other values.

[0057] Specifically, the propeller thrust and pull force measuring device further includes a thruster connection assembly 6. The thruster connection assembly 6 includes a connecting sleeve 61 and a thruster clamping handle 62. The connecting sleeve 61 is sleeved on the top end of the thruster mounting bracket 2 and is fixedly connected to the marine thruster 20 at one end. The thruster clamping handle 62 is threadedly connected to the connecting sleeve 61. The thruster clamping handle 62 rotates around its own axis to extend into the connecting sleeve 61 to clamp the thruster mounting bracket 2, so that the marine thruster 20 is fixedly connected to the top end of the thruster mounting bracket 2.

[0058] In this embodiment, there are two thruster clamping handles 62 on the connecting sleeve 61. The two thruster clamping handles 62 are located on both sides of the dynamometer 4, so as to lock and fix the thruster mounting bracket 2 more reliably and avoid interference with the connection between the dynamometer 4 and the thruster mounting bracket 2.

[0059] Optionally, the dynamometer 4 is connected to the thruster mounting bracket 2 and / or the stern plate fixing bracket 1 through a fixing component. The length of the fixing component is adjustable, so as to ensure that the axis of the dynamometer 4 is parallel or approximately parallel to the rotation axis of the propeller 10 and the horizontal plane 40.

[0060] Specifically, the fixing component includes a rod end spherical bearing. The rod end of the rod end spherical bearing is threadedly connected to the end of the dynamometer 4, and the bearing end of the rod end spherical bearing is rotatably connected to the thruster mounting bracket 2 or the stern plate fixing bracket 1.

[0061] More specifically, fixing components are respectively arranged at both ends of the dynamometer 4, and are respectively connected to the thruster mounting bracket 2 and the stern plate fixing bracket 1 through the two fixing components. In other embodiments, the connection length between the dynamometer 4 and the thruster mounting bracket 2 or between the dynamometer 4 and the stern plate fixing bracket 1 can also be adjustable, that is, only a fixing component needs to be arranged at one end of the dynamometer 4.

[0062] In this embodiment, the fixing components at both ends of the dynamometer 4 are respectively a first fixing component 71 and a second fixing component 72.

[0063] Among them, the first fixing component 71 is used to connect one end of the dynamometer 4 and the top of the first vertical frame 11. The first fixing component 71 includes a first rod end spherical bearing 711, a first set screw 712 and two first fixing plates 713. The rod end of the first rod end spherical bearing 711 is threadedly connected to the end of the dynamometer 4 facing the first vertical frame 11. The two first fixing plates 713 are clamped on the top of the first vertical frame 11. The bearing end of the first rod end spherical bearing 711 is located between the two first fixing plates 713. The first set screw 712 is connected to the two first fixing plates 713 and passes through the bearing of the first rod end spherical bearing 711. The adjustment of the connection length between the dynamometer 4 and the first vertical frame 11 is realized through the first rod end spherical bearing 711. In other embodiments, the first fixing component 71 can also be a connecting rod with threads at both ends. The two ends of the connecting rod are respectively threadedly connected to the first vertical frame 11 and the dynamometer 4, so as to realize the adjustment of the connection length between the dynamometer 4 and the first vertical frame 11.

[0064] Among them, the second fixing component 72 is used to connect the other end of the dynamometer 4 and the top of the thruster mounting bracket 2. The second fixing component 72 includes a second rod end spherical bearing 721, a second set screw and two second fixing plates 722. The rod end of the second rod end spherical bearing 721 is threadedly connected to the end of the dynamometer 4 facing the thruster mounting bracket 2. The two second fixing plates 722 are clamped on the top of the thruster mounting bracket 2. The bearing end of the second rod end spherical bearing 721 is located between the two second fixing plates 722. The second set screw is connected to the two second fixing plates 722 and passes through the bearing of the second rod end spherical bearing 721. The adjustment of the connection length between the dynamometer 4 and the thruster mounting bracket 2 is realized through the second rod end spherical bearing 721. In other embodiments, the second fixing component 72 can also be a connecting rod with threads at both ends. The two ends of the connecting rod are respectively threadedly connected to the thruster mounting bracket 2 and the dynamometer 4, so as to realize the adjustment of the connection length between the dynamometer 4 and the thruster mounting bracket 2.

[0065] Since there is a certain angle between the marine propeller 20 and the propeller mounting bracket 2, in this embodiment, the deflection angle of the propeller mounting bracket 2 relative to the support portion 3 can be adjusted by adjusting the screwed lengths of the first fixing component 71 and the second fixing component 72 and the dynamometer 4, so as to ensure that the rotation axis of the propeller 10 and the axis of the dynamometer 4 are both parallel or approximately parallel to the horizontal plane 40.

[0066] Optionally, the propeller thrust and pull force measuring device further includes two stern clamping handle assemblies 8, and the two stern clamping handle assemblies 8 are respectively connected to the two connecting frames 14.

[0067] Specifically, the stern clamping handle assembly 8 includes a connecting handle 81, a connecting nut 82 and a clamping plate 83. The connecting nut 82 is fixedly connected to the connecting frame 14. The connecting handle 81 is threadedly connected to the connecting nut 82 and passes through the connecting frame 14. The end of the connecting handle 81 extending into the space between the first vertical frame body 11 and the second vertical frame body 12 is fixedly connected to the clamping plate 83.

[0068] More specifically, during installation and use, the stern plate 30 is located between the clamping plate 83 and the first vertical frame body 11. Rotate the connecting handle 81 to move the clamping plate 83 towards the direction close to the first vertical frame body 11, and finally clamp the stern plate 30 between the clamping plate 83 and the first vertical frame body 11, so that the stern plate fixing frame 1 is fixed on the stern plate 30. By screwing the connecting handle 81 and the connecting nut 82, the clamping width can be adjusted according to the thickness of the stern plate 30 to adapt to stern plates 30 of various sizes and specifications.

[0069] In this embodiment, the two stern clamping handle assemblies 8 cooperate with each other to make the connection between the stern plate fixing frame 1 and the stern plate 30 more stable. In other embodiments, the number of the connecting frames 14 and the stern clamping handle assemblies 8 can also be other numbers, as long as the stern plate fixing frame 1 can be fixed on the stern plate 30.

[0070] The embodiment of the present invention also provides a method for measuring the propeller thrust and pull force. The above-mentioned propeller thrust and pull force measuring device includes the following steps:

[0071] Step 1: Obtain a first distance and a second distance. The connection point between the propeller mounting bracket 2 and the support portion 3 is the fulcrum 100. The first distance is the height difference between the axis of the dynamometer 4 and the fulcrum 100, and the second distance is the height difference between the fulcrum 100 and the rotation axis of the propeller 10.

[0072] Step 2: The propeller 10 rotates to generate a thrust or a pull force.

[0073] Step 3: The dynamometer 4 displays a measured value, and the measured value is the force generated by the propeller mounting bracket 2 on the dynamometer 4.

[0074] In this step, under the action of the thrust or pull force of the propeller 10, the thruster 20 drives the thruster mounting bracket 2 to rotate around the fulcrum 100, exerting a force on the dynamometer 4 until the moment at the fulcrum 100 reaches equilibrium.

[0075] Step Four: Calculate the thrust or pull force of the propeller 10. According to the lever principle, the relational expression for the thrust or pull force of the propeller 10 is:

[0076] F2 = (F1 × L1) / L2;

[0077] Wherein, F2 is the thrust or pull force of the propeller 10, F1 is the measured value of the dynamometer 4, L1 is the first distance, and L2 is the second distance.

[0078] In this step, according to the lever principle, the relational expression obtained at the fulcrum 100 is:

[0079] F1 × L1 = F2 × L2;

[0080] Wherein, F2 is the thrust or pull force of the propeller 10, F1 is the measured value of the dynamometer 4, L1 is the first distance, and L2 is the second distance.

[0081] Then, by deriving the above relational expression, the relational expression for the thrust or pull force of the propeller 10 can be obtained as: F2 = (F1 × L1) / L2.

[0082] Step Five: Adjust the rotational speed of the propeller 10, calculate the thrust or pull force of the propeller 10, and obtain the rotational speed-thrust / pull force curve of the propeller 10 based on the rotational speed value and the corresponding thrust or pull force value of the propeller 10.

[0083] For the propeller thrust / pull force measurement method proposed in the embodiment of the present invention, based on the measured value shown by the dynamometer 4 and the measured first distance and second distance, the thrust or pull force of the propeller 10 can be calculated through the lever principle, and the measurement accuracy is high.

[0084] Specifically, before measuring through the dynamometer 4, adjust the connection distances between the two ends of the dynamometer 4 and the stern plate fixing bracket 1 and the thruster mounting bracket 2 so that the axis of the dynamometer 4 and the axis of rotation of the propeller 10 are both parallel or approximately parallel to the horizontal plane 40.

[0085] In this embodiment, the support portion 3 is rotatably connected to the thruster mounting bracket 2 through the connecting portion 5, and the fulcrum 100 is located on the axis of the rotating shaft 51 of the connecting portion 5.

[0086] The above embodiments only 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, there are various changes and modifications to the present invention, and these changes and modifications all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A propeller thrust and pull force measuring device, wherein a propeller (10) is arranged on a marine propulsor (20) and is used for propelling a ship to run, and is characterized in that, The marine propeller (20) is an outboard motor, and the propeller thrust and pull measurement device includes: A transom fixing bracket (1), detachably connected to the transom (30) of the ship; A propeller mounting bracket (2), the marine propeller (20) is connected to the top end of the propeller mounting bracket (2) through a propeller connection assembly (6); A support part (3), one end is fixedly connected to the transom fixing bracket (1), and the other end is rotatably connected to the bottom end of the propeller mounting bracket (2); A dynamometer (4), one end is connected to the transom fixing bracket (1), and the other end is connected to the top end of the propeller mounting bracket (2); The dynamometer (4) is connected to the propeller mounting bracket (2) and / or the transom fixing bracket (1) through a fixing component, and the length of the fixing component is adjustable.

2. The propeller thrust and pull force measuring device according to claim 1, wherein The support part (3) is rotatably connected to the propeller mounting bracket (2) through a connecting part (5).

3. The propeller thrust and pull measurement device according to claim 2, characterized in that, The connecting part (5) includes a rotating shaft (51) and a bearing assembly (52). One end of the propeller mounting bracket (2) is sleeved and connected to the rotating shaft (51). The bearing assembly (52) includes a bearing and a bearing seat. The outer ring of the bearing is fixedly connected inside the bearing seat. The rotating shaft (51) is fixedly connected to the inner ring of the bearing, and the bearing seat is fixedly connected to the support part (3).

4. The propeller thrust and pull measurement device according to claim 1, characterized in that The fixing component includes a rod end spherical bearing. The rod end of the rod end spherical bearing is threadedly connected to the end of the dynamometer (4), and the bearing end of the rod end spherical bearing is rotatably connected to the propeller mounting bracket (2) or the transom fixing bracket (1).

5. The propeller thrust and pull measurement device according to claim 1, characterized in that, The transom fixing bracket (1) includes a first vertical frame body (11). The support part (3) is fixedly connected to one end of the first vertical frame body (11), and the dynamometer (4) is connected to the other end of the first vertical frame body (11).

6. The propeller thrust and pull measurement device according to claim 5, characterized in that The support part (3) includes an outer frame (31) and a first inclined support frame (32). The bottom end of the first vertical frame body (11) is fixedly connected to the outer frame (31). The first inclined support frame (32) is inclined. One end of the first inclined support frame (32) is fixedly connected to the outer frame (31), and the other end is fixedly connected to the first vertical frame body (11).

7. A method for measuring the thrust and pull force of a propeller, characterized in that, The propeller thrust and pull measurement device according to any one of claims 1-6 includes: Obtain a first distance and a second distance. The connection point between the propeller mounting bracket (2) and the support part (3) is a fulcrum (100). The first distance is the height difference between the axis of the dynamometer (4) and the fulcrum (100), and the second distance is the height difference between the fulcrum (100) and the rotation axis of the propeller (10); The propeller (10) rotates to generate thrust or pull; The dynamometer (4) displays a measured value, and the measured value is the force generated by the propeller mounting bracket (2) on the dynamometer (4); Calculate the thrust or pull of the propeller (10). According to the lever principle, the relationship formula for the thrust or pull of the propeller (10) is: F2 = (F1 × L1) / L2; Wherein, F2 is the thrust or pull force of the propeller (10), F1 is the measured value of the dynamometer (4), L1 is the first distance, and L2 is the second distance; Adjust the rotational speed of the propeller (10), calculate the thrust or pull force of the propeller (10), and obtain the rotational speed thrust and pull force curve of the propeller (10) based on the rotational speed value and the corresponding thrust or pull force value of the propeller (10).

8. The propeller thrust and pull measurement method according to claim 7, characterized in that Before measuring through the dynamometer (4), adjust the connection distances between the two ends of the dynamometer (4) and the stern plate fixing frame (1) and the thruster mounting frame (2) so that the axis of the dynamometer (4) and the axis of rotation of the propeller (10) are both parallel to the horizontal plane (40).

9. The propeller thrust and pull measurement method according to claim 7, characterized in that, The support portion (3) is rotatably connected to the thruster mounting frame (2) through the connecting portion (5), and the fulcrum (100) is located on the axis of the connecting portion (5).

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