Device and method for measuring heeling angle in ship inclination test

Abstract

The invention provides a heeling angle measuring device and a heeling angle measuring method for a ship inclination test. The heeling angle measuring device for the ship inclination test comprises a supporting bracket, a reduction gear set, a pendulum bob, a pointer and a side magnet strip, the supporting bracket comprises a bottom plate and a side plate which is perpendicular to the bottom plate and fixed to the bottom plate, a shell of the reduction gear set is fixed to the rear end face of the side plate, and the pendulum bob is fixedly connected to the lower portion of an output shaft of the reduction gear set. An input shaft of the reduction gear set penetrates through a through hole of the side plate and then is fixedly connected with a pointer on one side of the front end face of the side plate, a dial is arranged on the front end face of the side plate to observe the rotation angle of the pointer, a side face magnet strip is fixed to the front end face of the side plate, the supporting support is made of non-metal materials, and the side face magnet strip is used for making the pendulum bob swing still. According to the heeling angle measuring device for the ship inclination test, the accuracy of ship heeling angle measurement can be improved, and meanwhile the size of the heeling angle measuring device is small.

Description

Technical Field

[0001] The present invention relates to the technical field of ship testing, and in particular to a device and method for measuring the heel angle of a ship tilt test. Background Art

[0002] After the ship is built, an inclination test is required to determine the actual weight and center of gravity of the ship in order to fully understand the ship's displacement, stability, unsinkability and other performance. An important step in the inclination test is to measure the ship's heel angle after the ballast is moved. The measurement methods usually include the pendulum measurement method and the U-tube measurement method. The heel angle of the ship is magnified into a larger displacement through a longer pendulum line and a U-tube for reading. The resolution of the angle measurement result is very high, reaching about 0.01 degrees.

[0003] Although the above two methods of measuring the heel angle have very high resolution, they have great defects in actual operation. The defects of the pendulum measurement method mainly include: the test tools are complicated, and it is necessary to prepare a variety of test tools such as long water tanks, pendulum lines, pendulums, steel rulers, etc., and the size is large; there are few suitable test areas, and the height of the pendulum line usually needs to reach more than 4m, requiring the test position to have a height space of more than 4m, usually across two decks; the test reading is difficult, and the pendulum does not move in the plane under the combined effect of the slight longitudinal movement of the hull and the liquid in the long water tank, which affects the timing of the reading and the accuracy of the measurement method itself. The main defect of the U-tube measurement method is that it will be greatly affected by extreme weather: in cold areas, the liquid in the tube will freeze, and in hot areas, the liquid in the tube will evaporate, making the test measurement impossible. Summary of the invention

[0004] The main purpose of the present invention is to provide a device and method for measuring the heel angle of a ship inclination test, aiming to improve the accuracy of measuring the heel angle of the ship while having a small size.

[0005] To achieve the above object, the present invention provides a device for measuring the heel angle of a ship tilt test, comprising a support bracket, a reduction gear set, a pendulum, a pointer and a side magnet strip, wherein: The supporting bracket includes a bottom plate and a side plate which is vertically arranged and fixed to the bottom plate. The housing of the reduction gear set is fixed to the rear end surface of the side plate. A pendulum is fixedly connected below the output shaft of the reduction gear set. The input shaft of the reduction gear set passes through the through hole of the side plate and is fixedly connected to a pointer on one side of the front end surface of the side plate. A dial is arranged on the front end surface of the side plate to observe the rotation angle of the pointer. A side magnet strip is fixed on the front end surface of the side plate. The supporting bracket is made of non-metallic material. The side magnet strip is used to make the pendulum swing and stop as quickly as possible.

[0006] Preferably, the diameter of the through hole of the side plate is larger than the diameter of the input shaft of the reduction gear set, the through hole and the output shaft are coaxially arranged, and the output shaft passes through the through hole of the side plate without contact.

[0007] Preferably, the pendulum comprises a pendulum rod fixedly connected to the output shaft and a drop weight located at the end of the pendulum rod, and the drop weight and the pendulum rod are made of metal.

[0008] Preferably, the reduction ratio of the reduction gear set is 40:1-60:1.

[0009] Preferably, a bottom magnet bar is installed on the bottom plate, and the bottom magnet bar is used to make the measuring device adsorbed on the steel deck of the hull.

[0010] Preferably, the pointer has greater rigidity and is not easily deformed, and the elastic modulus is not less than 190 GPa; the width of the pointer tip is not greater than one-fourth of the distance between adjacent scales.

[0011] Preferably, the scale plate is a circular scale plate, and the circumference of the circular scale plate is evenly divided with scale lines.

[0012] Preferably, the diameter of the circular dial is an integer multiple of 240 mm, and the angle between two adjacent scale dividing lines of the circular dial is an integer multiple of 0.5 degrees, which is convenient for device manufacturing, calibration and measurement.

[0013] Preferably, the parameters of the side magnet strips and the pendulum are designed so that the pendulum swings from the beginning to rest within 30 seconds.

[0014] The present invention further proposes a measurement method based on the above-mentioned heel angle measurement device for ship inclination test, comprising the following steps: Fix the support bracket on the steel deck of the ship and make the center line of the side plate of the support bracket perpendicular to the longitudinal axis of the ship; After receiving the measurement instruction, observe the movement of the pointer on the dial and record the scale value of the pointer's rotation relative to the dial; The ship's heel angle is calculated based on the recorded pointer rotation scale value.

[0015] The device for measuring the heel angle of a ship tilt test proposed by the present invention has the following beneficial effects: 1. The present invention optimizes and improves the pendulum measurement method, and replaces the long pendulum line in the pendulum measurement method with a reduction gear set with a high reduction ratio, so that the measuring device is miniaturized and very convenient for use in the internal area of ​​the ship; 2. The pendulum in the present invention moves only in a plane and uses electromagnetic effect to provide swing damping, which avoids the irregular movement of the pendulum in the pendulum measurement method due to complex factors, thereby improving the convenience of reading and the accuracy of measurement; 3. The present invention has a high degree of integration. Compared with the pendulum measurement method and the U-tube measurement method, it reduces the workload of preparing and installing various test tools in the tilt test. At the same time, the measuring device also has the advantages of simple structure, small size, convenient measurement and easy implementation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a preferred embodiment of a heel angle measuring device for a ship tilt test according to the present invention from a first perspective; Figure 2 It is a structural schematic diagram from another perspective of a preferred embodiment of the heel angle measuring device for a ship tilt test of the present invention.

[0017] In the figure, 1. support bracket; 11. bottom plate; 12. side plate; 13. dial; 2. bottom magnet bar; 3. reduction gear set; 31. output shaft; 32. input shaft; 4. pendulum; 41. pendulum rod; 42. drop weight; 5. pointer; 6. side magnet bar.

[0018] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0019] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0020] It should be noted that in the description of the present invention, the terms "transverse", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0021] The invention provides a device for measuring the heel angle of a ship inclination test.

[0022] Reference Figure 1 and Figure 2 In this preferred embodiment, a device for measuring the heel angle of a ship inclination test includes a support bracket 1, a reduction gear set 3, a pendulum 4, a pointer 5 and a side magnet strip 6, wherein: The support bracket 1 includes a base plate 11 and a side plate 12 which is vertically arranged and fixed to the base plate 11. The housing of the reduction gear set 3 is fixed to the rear end surface of the side plate 12. A pendulum 4 is fixedly connected below the output shaft 31 of the reduction gear set 3. The input shaft 32 of the reduction gear set 3 passes through the through hole of the side plate 12 and is fixedly connected to a pointer 5 on one side of the front end surface of the side plate 12. A dial 13 is provided on the front end surface of the side plate 12 to observe the rotation angle of the pointer 5. A side magnet strip 6 is fixed on the front end surface of the side plate 12. The support bracket 1 is made of non-metallic material (such as acrylic). The side magnet strip 6 is used to make the pendulum 4 swing and stop as quickly as possible.

[0023] Specifically, the parameters of the side magnet strip 6 and the pendulum 4 are designed so that the pendulum swings from the beginning to rest within 30 seconds.

[0024] Specifically, in this embodiment, the diameter of the through hole of the side plate 12 is larger than the diameter of the input shaft 32 of the reduction gear set 3, the through hole and the output shaft 31 are coaxially arranged, and the output shaft 31 passes through the through hole of the side plate 12 without contact. The bottom plate 11 and the side plate 12 can be bonded.

[0025] Specifically, refer to Figure 1 The pendulum 4 includes a swing rod 41 fixedly connected to the output shaft 31 and a drop weight 42 located at the end of the swing rod 41 and fixedly connected thereto. The drop weight 42 and the swing rod 41 are made of metal. The end surface of the housing of the reduction gear set 3 is fixed to the rear end surface of the side plate 12 by fasteners. The side magnet strip 6 can be fixed to the side plate 12 by bonding.

[0026] Specifically, in this embodiment, the drop weight 42 is an aluminum disc, which is located behind the side magnet strip 6 when stationary. When swinging under the action of gravity, it will be affected by the magnetic field of the side magnet strip 6, so that the swinging will gradually slow down and tend to be stable and stationary in a short time. If the swinging of the pendulum 4 slows down too fast or too slow, it can be adjusted by replacing the side magnet strip 6.

[0027] Specifically, the reduction ratio of the reduction gear set 3 is 40: 1 to 60: 1. In this embodiment, the reduction ratio of the reduction gear set 3 is 50: 1 as an example for specific description.

[0028] Furthermore, a bottom magnet bar 2 is installed on the bottom plate 11, and the bottom magnet bar 2 is used to adsorb the measuring device on the steel deck of the hull. The present embodiment is specifically described by taking two bottom magnet bars 2 as an example. The two bottom magnet bars 2 are located on both sides of the drop weight 42. By providing the bottom magnet bar 2, it is convenient to install the heel angle measuring device of the ship inclination test on the steel deck of the hull, without the need to use buckles and other solutions, and the installation is very convenient.

[0029] Furthermore, the pointer 5 has a large rigidity and is not easily deformed, and its elastic modulus is not less than 190 GPa. The width of the tip of the pointer 5 can meet the need of reading on the scale plate 13, and the width is not greater than a quarter of the distance between adjacent scales.

[0030] Specifically, refer to Figure 2 In this embodiment, the scale plate 13 is a circular scale plate, and the circumferential direction of the circular scale plate is evenly divided with scale lines.

[0031] The diameter of the circular dial is an integer multiple of 240 mm, and the angle between two adjacent scale dividing lines of the circular dial is an integer multiple of 0.5 degrees. In this embodiment, the diameter of the circular dial is 240 mm, and the angle between two adjacent scale dividing lines is 0.5 degrees.

[0032] The working process of the heel angle measuring device for ship tilt test is as follows: Fix the support bracket 1 on the steel deck of the ship, and make the center line of the side plate 12 of the support bracket 1 perpendicular to the longitudinal axis of the ship; After receiving the measurement instruction, observe the movement of the pointer 5 on the scale plate 13 and record the scale value of the pointer 5 rotating relative to the scale plate 13; The ship's heel angle is calculated based on the recorded pointer 5 rotation scale value.

[0033] Under the reduction ratio i and the angle θ between the scale lines, the conversion formula for the change in reading m on the dial 13 and the change in the ship's heel angle n is: n=m*θ / i. Under the above-recommended reduction ratio and the angle between the scale lines, the conversion formula for the change in reading m on the dial 13 and the change in the ship's heel angle n is: n=0.01m, that is, for every 1 unit change in the reading on the dial 13, the ship's heel angle changes by 0.01 degrees.

[0034] The circular scale is evenly divided with scale lines, and the angle between the scale lines is recommended to be 0.5 degrees. Under the coordination of the recommended diameter and the angle between the scale lines, the arc length between the scale lines on the outer ring of the scale 13 is about 1 mm, which can meet the needs of the test personnel to read. Under the recommended angle between the scale lines, it is recommended that the scale value of the scale 13 be marked according to the following scheme: on the inner ring of the scale 13, the scale position pointed to by the pointer 5 when the measuring device is placed on a horizontal plane is marked as "360". Starting from the "360" position, a scale value is marked every 5 degrees clockwise, and each scale value increases by 10 in turn, and the maximum scale value is "710". Starting from the "360" position, a scale value is marked every 5 degrees counterclockwise, and each scale value decreases by 10 in turn, and the minimum scale value is "0".

[0035] Specifically, the following method is used when calculating the heel angle of the ship: when the heel angle of the ship is large, the pointer 5 may cross the "0" scale value on the dial 13 clockwise or counterclockwise (the "0" scale value is also the maximum scale value). At this time, the number of rotations should be recorded (the number of clockwise and counterclockwise circles should be opposite numbers), multiplied by the scale value represented by one circle and added to the current scale value of the pointer 5 to obtain the measured value.

[0036] For example, if the pointer 5 rotates clockwise and crosses the "0" scale value once, the reading is 76, and the calculated measurement value is 720×1+76=796; if the pointer 5 rotates counterclockwise and crosses the "0" scale value twice, the reading is 14, and the calculated measurement value is 720×(-2)+14=-1426. Considering that the heel angle of the ship in the inclination test generally does not exceed 5°, the number of times the pointer 5 crosses the "0" scale value generally does not exceed 1 time.

[0037] The device for measuring the heel angle of a ship tilt test proposed by the present invention has the following beneficial effects: 1. The present invention optimizes and improves the pendulum measurement method, and uses a high reduction ratio reduction gear set 3 to replace the long pendulum line in the pendulum measurement method, so that the measuring device is miniaturized and very convenient for use in the internal area of ​​the ship; 2. The pendulum 4 in the present invention moves only in a plane and uses electromagnetic effect to provide swing damping, thereby avoiding the irregular movement of the pendulum under the influence of complex factors in the pendulum measurement method, thereby improving the convenience of reading and the accuracy of measurement; 3. The present invention has a high degree of integration. Compared with the pendulum measurement method and the U-tube measurement method, it reduces the workload of preparing and installing various test tools in the tilt test. At the same time, the measuring device also has the advantages of simple structure, small size, convenient measurement and easy implementation.

[0038] The present invention further provides a method for measuring a heel angle measurement device for a ship tilt test.

[0039] In this preferred embodiment, a measurement method based on the above-mentioned heel angle measurement device for ship tilt test comprises the following steps: Step S10, fixing the support bracket 1 on the steel deck of the ship, and making the center line of the side plate 12 of the support bracket 1 perpendicular to the longitudinal axis of the ship; Step S20, after receiving the measurement instruction, observe the movement of the pointer 5 on the scale plate 13, and record the scale value of the pointer 5 rotating relative to the scale plate 13; Step S30, calculating the heel angle of the ship according to the recorded rotation scale value of the pointer 5.

[0040] The measuring method proposed by the invention is easy to operate and has high measuring accuracy.

[0041] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A device for measuring the heel angle of a ship inclination test, characterized in that: It includes a support bracket, a reduction gear set, a pendulum, a pointer and a side magnet strip, wherein: The supporting bracket includes a bottom plate and a side plate which is vertically arranged and fixed to the bottom plate. The housing of the reduction gear set is fixed to the rear end surface of the side plate. A pendulum is fixedly connected below the output shaft of the reduction gear set. The input shaft of the reduction gear set passes through the through hole of the side plate and is fixedly connected to a pointer on one side of the front end surface of the side plate. A dial is arranged on the front end surface of the side plate to observe the rotation angle of the pointer. A side magnet strip is fixed on the front end surface of the side plate. The supporting bracket is made of non-metallic material. The side magnet strip is used to make the pendulum swing and stop as quickly as possible.

2. The heel angle measuring device for ship tilt test according to claim 1, characterized in that: The diameter of the through hole of the side plate is larger than the diameter of the input shaft of the reduction gear set, the through hole and the output shaft are coaxially arranged, and the output shaft passes through the through hole of the side plate without contact.

3. The heel angle measuring device for ship tilt test according to claim 1, characterized in that: The pendulum comprises a pendulum rod fixedly connected to the output shaft and a drop weight located at the end of the pendulum rod, and the drop weight and the pendulum rod are made of metal material.

4. The heel angle measuring device for ship tilt test according to claim 1, characterized in that: The reduction ratio of the reduction gear set is 40:1-60:

1.

5. The heel angle measuring device for ship tilt test according to claim 1, characterized in that: A bottom magnet bar is installed on the bottom plate, and the bottom magnet bar is used to make the measuring device adsorb on the steel deck of the hull.

6. The heel angle measuring device for ship tilt test according to claim 1, characterized in that: The elastic modulus of the pointer is not less than 190 GPa; the width of the pointer tip is not greater than one quarter of the distance between adjacent scales.

7. The heel angle measuring device for ship tilt test according to claim 1, characterized in that: The scale plate is a circular scale plate, and scale lines are evenly divided in the circumferential direction of the circular scale plate.

8. The heel angle measuring device for ship tilt test according to claim 1, characterized in that: The diameter of the circular scale plate is an integer multiple of 240 mm, and the angle between two adjacent scale dividing lines of the circular scale plate is an integer multiple of 0.5 degrees, which is convenient for device manufacturing, calibration and measurement.

9. The heel angle measuring device for ship tilt test according to claim 1, characterized in that: The parameters of the side magnet strips and the pendulum are designed so that the pendulum swings from the beginning to rest within 30 seconds.

10. A measurement method based on the heel angle measurement device for ship inclination test according to any one of claims 1 to 9, characterized in that: The following steps are involved: Fix the support bracket on the steel deck of the ship and make the center line of the side plate of the support bracket perpendicular to the longitudinal axis of the ship; After receiving the measurement instruction, observe the movement of the pointer on the dial and record the scale value of the pointer's rotation relative to the dial; The ship's heel angle is calculated based on the recorded pointer rotation scale value.

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