Shaftless Water Jet Propulsion Thrust Measuring Device

Abstract

The present invention discloses a thrust measurement device for a shaftless water jet thruster, which comprises a thrust scale and a thruster mounting bracket. The thrust scale includes a base, a lever arm mounted on the base, and pressure sensors respectively mounted between the two ends of the lever arm and the base. The thruster mounting bracket is mounted on the lever arm. The bottom of the thruster mounting bracket has a thruster mounting portion for mounting the thruster. The thruster mounting portion is pushed by the horizontal thrust generated by the thruster and drives the lever arm to swing through the thruster mounting bracket, converting the horizontal thrust into the tension and pressure at both ends of the pressure sensor. In the present invention, this device can cooperate with the independent thruster detection, with low experimental cost, convenient installation, small required test site, which is beneficial to production and experiment. Moreover, this device simulates the actual use environment of the thruster through a relatively simple structure, improves the detection efficiency of the thruster, is beneficial to shortening the R & D cycle of the thruster, and improves the production efficiency of the thruster.

Description

Technical Field

[0001] The present invention relates to the field of ship propeller manufacturing, and particularly to a thrust measuring device for a shaftless water jet propeller. Background Art

[0002] With the increasing expansion of the shaftless water jet propeller market and the improvement of production capacity, the requirements for product performance testing and quality inspection of shaftless water jet propellers are prominent. The existing testing methods are usually the method of in-service ship thrust testing, which has high experimental costs, inconvenient installation, requires a large test site, and is not conducive to production and experiments.

[0003] Therefore, a thrust measuring device for a shaftless water jet propeller is needed, which can cooperate with the detection of an independent propeller, has low experimental costs, is convenient to install, requires a small test site, and is conducive to production and experiments. Summary of the Invention

[0004] In view of this, the present invention provides a thrust measuring device for a shaftless water jet propeller, which can cooperate with the detection of an independent propeller, has low experimental costs, is convenient to install, requires a small test site, and is conducive to production and experiments.

[0005] The thrust measuring device for a shaftless water jet propeller of the present invention includes a thrust scale and a propeller mounting bracket. The thrust scale includes a base, a lever arm mounted on the base, and pressure sensors respectively mounted between the two ends of the lever arm and the base. The propeller mounting bracket is mounted on the lever arm. The bottom of the propeller mounting bracket has a propeller mounting portion for mounting the propeller. The propeller mounting portion is pushed by the horizontal thrust generated by the propeller and drives the lever arm to swing through the propeller mounting bracket, converting the horizontal thrust into the tension and pressure at both ends of the pressure sensor.

[0006] Further, a pair of lever arms are provided and are parallelly mounted below the base on the same horizontal plane. The thrust scale further includes a pair of parallel weighing arms, and the two weighing arms are respectively arranged on both sides of the rotation fulcrum of the lever arm and are perpendicularly connected between the two lever arms. The propeller mounting bracket is mounted on the two weighing arms.

[0007] Further, the propeller mounting bracket includes a force transmission frame, and the force transmission frame includes a horizontal main beam, a horizontal connecting rod, and two thrust pull rods. The upper ends of the two thrust pull rods are respectively rotatably and cooperatively mounted at both ends of the horizontal main beam, and the lower ends are respectively rotatably and cooperatively mounted at both ends of the horizontal connecting rod. The propeller mounting portion is connected below the horizontal connecting rod, and both ends of the horizontal main beam are respectively rotatably and cooperatively connected with the two weighing arms.

[0008] Further, the propeller mounting bracket further includes a vertical main beam, and the horizontal main beam and the horizontal connecting rod are fixedly connected to the vertical main beam in a cross shape.

[0009] Further, mounting shafts are horizontally arranged at both ends of the horizontal main beam perpendicular to the horizontal main beam, and the mounting shafts are rotationally and fittingly mounted on the weighing arm.

[0010] Further, two sets of the force transmission frames are provided and are respectively clamped on both sides of the vertical main beam in parallel.

[0011] Further, the vertical main beam is a hollow structure with openings at both the upper and lower ends, and the thruster mounting part is arranged at the lower end of the vertical main beam.

[0012] Further, the horizontal main beam is longer than the horizontal connecting rod, and the horizontal main beam, the horizontal connecting rod and the two thrust pull rods enclose an inverted equilateral trapezoidal frame structure.

[0013] Further, the thrust scale further includes a disassembly and assembly fixture, which includes a substrate and a clamping plate. The substrate is fixedly mounted on the weighing arm, and the clamping plate is mounted on the substrate in a manner that can be driven to approach or move away from the substrate. Arc-shaped grooves are provided on the opposite surfaces of the clamping plate and the clamping board. When the substrate and the clamping plate approach each other, the two arc-shaped grooves conformally clamp on the mounting shaft so that the mounting shaft is rotationally and fittingly connected with the disassembly and assembly fixture.

[0014] Further, the base is a square frame structure, and the two lever arms and the two weighing arms are respectively arranged below the four sides of the base and are parallel to the respective sides of the base. Four pressure sensors are provided and are arranged at the four corners of the base.

[0015] Advantages of the present invention:

[0016] In the present invention, the device can be used in cooperation with the independent thruster detection, with low experimental cost, convenient installation, small required test site, which is beneficial to production and experiment; and the device simulates the actual use environment of the thruster through a relatively simple structure, improves the detection efficiency of the thruster, is beneficial to shortening the R & D cycle of the thruster, and improves the production efficiency of the thruster. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the drawings and embodiments.

[0018] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 is a schematic diagram of the thruster mounting frame structure;

[0020] Figure 3 is a schematic diagram of the thrust scale structure Figure 1 ;

[0021] Figure 4 is a schematic diagram of the partially enlarged structure of the thrust scale;

[0022] Figure 5 is a schematic diagram of the thrust scale structureFigure 2 ; Detailed implementation mode

[0023] The thrust measurement device of the shaftless water jet propeller in this embodiment includes a thrust scale 10 and a propeller mounting bracket 20. The thrust scale 10 includes a base 11, a lever arm 12 mounted on the base, and pressure sensors 15 respectively mounted between the two ends of the lever arm and the base. The propeller mounting bracket 20 is mounted on the lever arm 12. The bottom of the propeller mounting bracket has a propeller mounting portion 21 for mounting the propeller. The propeller mounting portion 21 is pushed by the horizontal thrust generated by the propeller and drives the lever arm to swing through the propeller mounting bracket, converting the horizontal thrust into the tension and pressure at both ends of the pressure sensor 15. Combined with Figure 1 As shown, the thrust scale is mounted overhead on the bracket 30. The bracket can be a gantry steel structure or a concrete bridge structure. The base 11 is fixedly mounted at the bottom of the bracket 30 to form an overhead mounting structure. The propeller mounting bracket 20 is suspended below the lever arm of the thrust scale. The middle of the lever arm is rotatably fitted and mounted at the bottom of the base 11. The propeller mounting portion 21 is a flange structure. The propeller 40 is mounted on the propeller mounting portion 21. Among them, the bracket 30 is erected above the pool 50, and the propeller 40 is immersed in the liquid of the pool to simulate the operating environment of the shaftless water jet propeller. After the propeller 40 is started, it will generate a horizontal driving force. This horizontal driving force drives the lever arm to swing through the propeller mounting bracket 20, and then converts the horizontal driving force into the tension and pressure driving both ends of the lever arm. The tension and pressure are detected by the pressure sensor 15. Among them, according to different strain gauge arrangement methods, the pressure sensor 15 can adopt sensors with beam bending deformation, shaft torsion deformation or cylinder tension and compression deformation. The pressure sensor can purchase an existing structure and will not be elaborated here;

[0024] In this embodiment, there are a pair of lever arms 12, which are installed in parallel on the lower side of the base 11 on the same horizontal plane. The thrust scale 10 further includes a pair of parallel weighing arms 13. The two weighing arms are respectively arranged on both sides of the rotation fulcrum of the lever arm and are vertically connected between the two lever arms. The propeller mounting bracket 20 is mounted on the two weighing arms 13. Combined with Figure 3 and Figure 5 As shown, the two lever arms 12 and the two weighing arms 13 form a horizontal square structure. The two weighing arms 13 provide two mounting positions for the propeller mounting bracket 20, which is conducive to the installation of the propeller mounting bracket 20 and conducive to maintaining the spatial force balance. Four pressure sensors are correspondingly arranged at the ends of the two lever arms 12. When the propeller mounting bracket 20 is stressed and offset, through the mutual correction of the four pressure sensors, it is conducive to accurately measuring the component forces in each direction, and the measurement error caused by the installation error can also be eliminated;

[0025] In this embodiment, the thruster mounting bracket 20 includes a force transmission frame, which includes a horizontal main beam 22, a horizontal connecting rod 23, and two thrust tie rods 24. The upper ends of the two thrust tie rods are respectively rotatably installed at both ends of the horizontal main beam, and the lower ends are respectively rotatably installed at both ends of the horizontal connecting rod. The thruster mounting portion 21 is connected below the horizontal connecting rod, and both ends of the horizontal main beam are respectively rotatably matched with the two weighing arms. Combined with Figure 2 As shown, an installation joint 27 is rotatably installed at the end of the horizontal main beam 22, and the thrust tie rod 24 is obliquely inserted and fixed on the installation joint, so that the thrust tie rod 24 forms a rotational mating relationship with the horizontal main beam 22. By forming tensile and compressive effects through the two thrust tie rods respectively, it is beneficial to drive the horizontal main beam 22 to swing and then drive the lever arm 12 and the weighing arm 13 to swing adaptively. The setting of the push-pull tie rods on both sides can transmit the huge thrust of the thruster to the thrust scale for measurement. At the same time, the setting of the thrust tie rod can prevent the sensor from being immersed in water and failing.

[0026] In this embodiment, the thruster mounting bracket 20 further includes a vertical main beam 25, and the horizontal main beam and the horizontal connecting rod are fixedly connected to the vertical main beam in a cross shape. Combined with Figure 2 As shown, the setting of the vertical main beam is beneficial to improve the stability of the whole structure and beneficial to ensure the stability of the thruster 40.

[0027] In this embodiment, mounting shafts 26 are horizontally arranged perpendicular to the horizontal main beam at both ends of the horizontal main beam 22, and the mounting shafts are rotatably installed on the weighing arm 13. The weighing arm is rotatably installed between the two lever arms, so that when the thruster mounting bracket 20 is driven to be offset, the mounting shaft and the weighing arm rotate relative to each other adaptively.

[0028] In this embodiment, two sets of force transmission frames are provided and are respectively clamped on both sides of the vertical main beam in parallel. Combined with Figure 2 As shown, the two sets of force transmission frames are located on the front and rear sides of the vertical main beam. The mounting shaft 26 is horizontally inserted at the ends of the two horizontal main beams 22, forming a space frame structure, improving the force transmission path and force transmission effect of the thruster mounting bracket 20, and improving the detection accuracy.

[0029] In this embodiment, the vertical main beam is a hollow structure with openings at the upper and lower ends, and the thruster mounting portion 21 is arranged at the lower end of the vertical main beam. Combined with Figure 2 As shown, the vertical main beam is a square beam, and its hollow inner cavity serves as a wire passing channel, which can be used to pass wires and connect to the thruster 40. The thruster mounting portion is a flange structure, which is used to connect with the thruster base flange and is sealed with a sealing ring; the thruster power cable passes through the wire passing channel of the vertical main beam, and the connection between the thruster mounting portion and the vertical main beam is fully welded to ensure that the wiring terminals in the vertical main beam will not be immersed in water and cause danger; the square vertical main beam is also beneficial to the mating connection with the horizontal main beam 22 and the horizontal connecting rod 23.

[0030] In this embodiment, the horizontal main beam 22 is longer than the horizontal connecting rod 23, and the horizontal main beam 22, the horizontal connecting rod 23 and the two groups of thrust rods 24 enclose an inverted equilateral trapezoidal frame structure. The vertical main beam is arranged in the middle relative to the horizontal main beam and the horizontal connecting rod. This structure is conducive to forming equal amounts of thrust and tension through the thrust rods 24, optimizing the force transmission path, and improving the detection accuracy.

[0031] In this embodiment, the thrust scale 10 further includes a disassembly and assembly fixture 14. The disassembly and assembly fixture includes a base plate 14a and a clamping plate 14b. The base plate is fixedly installed on the weighing arm 13. The clamping plate is installed on the base plate in a manner that can be driven to approach or move away from the base plate. An arc-shaped groove 14c is provided on the opposite surfaces of the clamping plate and the clamping block. When the base plate 14a and the clamping plate 14b approach each other, the two arc-shaped grooves conformally clamp the mounting shaft 26 so that the mounting shaft is rotationally matched with the disassembly and assembly fixture 14. Figure 4 As shown, there are two disassembly and assembly fixtures 14 on each weighing arm 13. The two ends of the rotating shaft 26 are respectively installed on the two disassembly and assembly fixtures 14. The distance between the base plate 14a and the clamping plate 14b can be adjusted by a screw, so that the two ends of the rotating shaft 26 are clamped in the arc-shaped groove 14c. The inner diameter of the arc-shaped groove 14c is preferably the same as the outer diameter of the rotating shaft, so that the rotating shaft 26 forms a stable rotational mating relationship with the disassembly and assembly fixture 14. In addition, a spacer 14d can be provided below the base plate 14a to adjust the height of the base plate.

[0032] In this embodiment, the base 11 is a square frame structure. The two lever arms 12 and the two weighing arms 13 are respectively arranged below the four sides of the base and are parallel to the respective sides of the base. Four pressure sensors are provided and are arranged at the four corners of the base. Figure 3 and Figure 5 As shown, through holes are provided at the four corners of the base 11. The pressure sensors are sleeved in the through holes. The upper part of the pressure sensor is supported on the upper surface of the base 11, and the lower part of the pressure sensor is rotationally mated with the end of the lever arm. This structure constitutes a three-dimensional thrust scale 10, improving the stability of the entire structure, facilitating mutual calibration by each pressure sensor to eliminate errors, and improving the detection accuracy.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A shaftless water jet propeller thrust measuring device, characterized in that: It includes a thrust scale and a thruster mounting bracket. The thrust scale includes a base, a lever arm mounted on the base, and pressure sensors respectively mounted between the two ends of the lever arm and the base. The thruster mounting bracket is mounted on the lever arm. The bottom of the thruster mounting bracket has a thruster mounting portion for mounting a thruster. The thruster mounting portion is pushed by the horizontal thrust generated by the thruster and drives the lever arm to swing through the thruster mounting bracket, converting the horizontal thrust into the tension and pressure at both ends of the pressure sensor. There are a pair of the lever arms, which are parallelly mounted below the base on the same horizontal plane. The thrust scale further includes a pair of parallel weighing arms. The two weighing arms are respectively arranged on both sides of the rotation fulcrum of the lever arm and are vertically connected between the two lever arms. The thruster mounting bracket is mounted on the two weighing arms. The thruster mounting bracket includes a force transmission frame. The force transmission frame includes a horizontal main beam, a horizontal connecting rod, and two thrust tie rods. The upper ends of the two thrust tie rods are respectively rotatably fitted and mounted at both ends of the horizontal main beam, and the lower ends are respectively rotatably fitted and mounted at both ends of the horizontal connecting rod. The thruster mounting portion is connected below the horizontal connecting rod. The two ends of the horizontal main beam are respectively rotatably fitted with the two weighing arms. The thruster mounting bracket further includes a vertical main beam. The horizontal main beam and the horizontal connecting rod are fixedly connected to the vertical main beam in a cross shape. Installation shafts are horizontally arranged perpendicular to the horizontal main beam at both ends of the horizontal main beam. The installation shafts are rotatably fitted and mounted on the weighing arms. The horizontal main beam is longer than the horizontal connecting rod. The horizontal main beam, the horizontal connecting rod, and the two groups of thrust tie rods enclose an inverted equilateral trapezoid frame structure.

2. The shaftless water jet propeller thrust measurement device according to claim 1, characterized in that: There are two groups of the force transmission frames, which are respectively and parallelly clamped on both sides of the vertical main beam.

3. The shaftless water jet thruster thrust measurement device according to claim 1, characterized in that: The vertical main beam is a hollow structure with openings at both the upper and lower ends. The thruster mounting portion is arranged at the lower end of the vertical main beam.

4. The shaftless water jet thruster thrust measurement device according to claim 1, characterized in that: The thrust scale further includes a disassembly and assembly fixture. The disassembly and assembly fixture includes a base plate and a clamping plate. The base plate is fixedly mounted on the weighing arm. The clamping plate is mounted on the base plate in a manner that can be driven to approach or move away from the base plate. Arc-shaped grooves are formed on the opposite surfaces of the clamping plate and the base plate. When the clamping plate and the base plate approach each other, the two arc-shaped grooves conformally clamp the installation shaft, enabling the installation shaft to be rotatably fitted with the disassembly and assembly fixture.

5. The shaftless water jet thruster thrust measurement device according to claim 1, characterized in that: The base is a square frame structure. The two lever arms and the two weighing arms are respectively arranged below the four sides of the base and are parallel to the respective sides of the base. There are four pressure sensors, which are arranged at the four corners of the base.

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