A device for testing the center of gravity of a ship

Abstract

A kind of ship gravity center test device, including outer cylinder device and inner cylinder device, outer cylinder device includes outer cylinder cylinder, and outer cylinder cylinder is equipped with containing cavity, inner cylinder device includes inner cylinder cylinder and laser emitter, inner cylinder cylinder is located in containing cavity, and inner cylinder cylinder is rotationally connected to outer cylinder cylinder, inner cylinder cylinder can rotate along its axial direction, the axis of inner cylinder cylinder is parallel to first direction, the gravity center of inner cylinder device is lower than the axis of inner cylinder cylinder, laser emitter is located in inner cylinder cylinder, and laser emitter is towards down, the bottom surface of outer cylinder cylinder is equipped with the light transmission hole corresponding to laser emitter, and light transmission hole penetrates to containing cavity, and light transmission hole extends to the two sides of outer cylinder cylinder along second direction;So that test personnel can record laser drop point by the way of camera or human eye recognition laser drop point to obtain the swing amplitude of inner cylinder device, plus the device of the application is less affected by external factors, so that the precision of the device of the application is higher when testing.

Description

Technical Field

[0001] This invention relates to the field of ship testing technology, and in particular to a ship center of gravity testing device. Background Technology

[0002] Currently, all newly built ships must undergo inclining tests to determine their center of gravity, which significantly impacts the evaluation of their navigation performance. The pendulum method is commonly used for inclining tests, as follows: A pendulum is suspended by a cycloid and placed in an oil-water tank. A certain weight of ballast is then moved left and right at a fixed position on the ship to create a small heel angle. The moment of movement of the ballast and the amplitude of the pendulum's swing are recorded. The actual center of gravity of the ship is calculated from these moments and amplitudes. By comparing the actual center of gravity with the design center of gravity, relevant navigation loading calculation parameters are adjusted. However, the cycloid and pendulum are susceptible to external factors (such as wind and vibration), which can cause significant errors in the test. Furthermore, the spatial distance between the pendulum and the reading scale makes it difficult for personnel to take accurate readings during the swing, further increasing the test error. Therefore, the pendulum method is highly susceptible to human error and has relatively low accuracy. Summary of the Invention

[0003] The purpose of this invention is to provide a ship center of gravity testing device to solve the technical problem that the pendulum method is greatly affected by the factors of the test personnel and has low testing accuracy.

[0004] To achieve the above objectives, the present invention provides a ship center of gravity testing device, comprising an outer cylinder device and an inner cylinder device. The outer cylinder device includes an outer cylinder body with a receiving cavity. The inner cylinder device includes an inner cylinder body and a laser emitter. The inner cylinder body is disposed within the receiving cavity and is rotatably connected to the outer cylinder body. The inner cylinder body can rotate along its axial direction, and its axis is parallel to a first direction. The center of gravity of the inner cylinder device is lower than the axis of the inner cylinder body. The laser emitter is disposed in the inner cylinder body and faces downward. The bottom surface of the outer cylinder body has a light-transmitting hole corresponding to the laser emitter, which extends through the receiving cavity and extends to both sides of the outer cylinder body along a second direction.

[0005] Optionally, the inner cylinder device further includes a vertically arranged fixed cylinder, the laser emitter is disposed in the cylinder hole of the fixed cylinder, the top surface of the inner cylinder body is provided with an inner top hole that penetrates to its cylinder hole, the distance from the inner top hole to both ends of the inner cylinder body is equal, the bottom surface of the inner cylinder body is provided with an inner bottom hole that penetrates to its cylinder hole, the fixed cylinder is disposed in the inner top hole and the cylinder hole of the inner cylinder body, and the inner bottom hole corresponds to the laser emitter.

[0006] Optionally, the weight above the axis of the inner cylinder is greater than the weight below its axis.

[0007] Optionally, the inner cylinder is a horizontally arranged cylinder, and both ends of the inner cylinder are provided with an inner cylinder notch that runs through the second direction. The cross-sectional projection shape of the inner cylinder notch perpendicular to the second direction is triangular, and the distance between the top ends of the two inner cylinder notches is less than the distance between the bottom ends of the two inner cylinder notches.

[0008] Optionally, the inner cylinder device further includes two counterweights, which are disposed on the bottom surface of the bore of the inner cylinder or the bottom surface of the inner cylinder, and are symmetrically disposed on opposite sides of the laser emitter along the first direction.

[0009] Optionally, it also includes two rotating bearings, which are disposed within the receiving cavity. The axis of the rotating bearings is parallel to the first direction. The two rotating bearings are symmetrically disposed on opposite sides of the laser emitter along the first direction. There is a rotational gap between the receiving cavity and the outer wall of the inner cylinder. The rotating bearings are disposed in the rotational gap. The outer wall of the rotating bearings abuts against the receiving cavity, and the inner wall of the rotating bearings abuts against the outer wall of the inner cylinder.

[0010] Optionally, the outer cylinder device further includes a sealing plug. The top surface of the outer cylinder body is provided with an outer top hole that penetrates the receiving cavity. The outer top hole is provided corresponding to the inner top hole. The sealing plug is detachably provided in the outer top hole and blocks the outer top hole. The width of the rotation gap along the radial direction of the inner cylinder body is smaller than the length of the laser emitter along the vertical direction.

[0011] The outer cylinder device also includes a side cover. The end faces of both ends of the outer cylinder body are provided with side holes that penetrate into the receiving cavity. The side cover is detachably installed in the side hole and blocks the side hole.

[0012] Optionally, the outer cylinder is a cylindrical body, the light-transmitting hole is an elongated hole, and the two ends of the light-transmitting hole along its length direction are symmetrically located on opposite sides of the outer cylinder along the second direction. The length of the light-transmitting hole is less than half of the circumference of the side wall of the outer cylinder.

[0013] Optionally, the outer cylinder device further includes a light-transmitting plate, which is disposed on the outer side wall of the outer cylinder body corresponding to the light-transmitting hole. The light-transmitting plate blocks the light-transmitting hole and is made of a transparent material.

[0014] Optionally, the outer cylinder device further includes multiple fixing ears, each fixing ear having a through fixing hole. The fixing ears are all located on the outer side wall of the outer cylinder body, and the two sets of fixing ears are respectively located on opposite sides of the outer cylinder body along the second direction.

[0015] Compared with the prior art, the ship center of gravity testing device of this invention has the following advantages:

[0016] The outer cylinder of the outer cylinder device of this invention is fixedly connected to the ship, and the inner cylinder device is located in the receiving cavity of the outer cylinder. The laser emitter of the inner cylinder device is mounted on the inner cylinder of the inner cylinder device with a downward orientation. The inner cylinder is rotatably connected to the outer cylinder. The center of gravity of the inner cylinder device is lower than the axis of the inner cylinder, so that when the ship rolls from side to side and has an angle of inclination, the laser emitter can maintain a downward orientation. Furthermore, the bottom surface of the outer cylinder is provided with a light-transmitting hole corresponding to the laser emitter, so that the laser emitted by the laser emitter can be emitted outward through the light-transmitting hole. Specifically, the laser is directly projected onto a scale, so that the test personnel can take a reading by recording the laser landing point with a camera or by visually identifying the laser landing point, in order to obtain the ship's sway amplitude. In addition, the device of this invention is less affected by external factors (wind and vibration have less impact on this device), so the device of this invention has high accuracy in testing. Attached Figure Description

[0017] Figure 1 This is a front view of the cutting test apparatus of the present invention.

[0018] Figure 2 This is a bottom view of the test apparatus of the present invention.

[0019] Reference numerals: 1. Outer cylinder assembly; 11. Outer cylinder body; 111. Receiving cavity; 112. Light-transmitting hole; 113. Rotation gap; 12. Sealing plug; 13. Light-transmitting plate; 14. Side cover; 15. Fixing lug; 2. Inner cylinder assembly; 21. Inner cylinder body; 211. Inner bottom hole; 212. Inner cylinder notch; 22. Laser emitter; 23. Fixing cylinder; 24. Counterweight; 3. Rotating bearing. Detailed Implementation

[0020] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0021] In the description of this invention, it should be understood that the terms "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0023] like Figure 1 and 2 As shown, a ship center of gravity testing device of the present invention includes an outer cylinder device 1 and an inner cylinder device 2. The outer cylinder device 1 includes an outer cylinder body 11, which has a receiving cavity 111. The inner cylinder device 2 includes an inner cylinder body 21 and a laser emitter 22. The inner cylinder body 21 is disposed in the receiving cavity 111 and is rotatably connected to the outer cylinder body 11. The inner cylinder body 21 can rotate along its axial direction. The axis of the inner cylinder body 21 is parallel to a first direction. The center of gravity of the inner cylinder device 2 is lower than the axis of the inner cylinder body 21. The laser emitter 22 is disposed in the inner cylinder body 21 and faces downward. The bottom surface of the outer cylinder body 11 has a light-transmitting hole 112 corresponding to the laser emitter 22. The light-transmitting hole 112 penetrates into the receiving cavity 111 and extends to both sides of the outer cylinder body 11 along a second direction.

[0024] In the above technical solution, the outer cylinder body 11 of the outer cylinder device 1 is fixedly connected to the ship, and the inner cylinder device 2 is disposed in the receiving cavity 111 of the outer cylinder body 11. The laser emitter 22 of the inner cylinder device 2 is disposed on the inner cylinder body 21 of the inner cylinder device 2 with a downward orientation. The inner cylinder body 21 is rotatably connected to the outer cylinder body 11. The center of gravity of the inner cylinder device 2 is lower than the axis of the inner cylinder body 21, allowing the laser emitter 22 to maintain a downward orientation when the ship rolls left and right at an angle. Furthermore, a corresponding laser emitter 2 is provided on the bottom surface of the outer cylinder body 11. The light-transmitting hole 112 of the laser emitter 22 allows the laser emitted by the laser emitter 22 to be emitted outward through the light-transmitting hole 112. Specifically, the laser is directly shone on the scale, allowing the test personnel to record the laser landing point with a camera or identify the laser landing point with their eyes to obtain the ship's sway amplitude. In addition, the device of the present invention is less affected by external factors (wind and vibration have less impact on the device), which makes the device of the present invention have high test accuracy. Furthermore, there is an angle between the first direction, the second direction and the vertical direction, which is preferably 90°.

[0025] Furthermore, the inner cylinder device 2 also includes a vertically arranged fixed cylinder 23, and the laser emitter 22 is disposed in the cylinder hole of the fixed cylinder 23. The top surface of the inner cylinder body 21 is provided with an inner top hole penetrating to its cylinder hole, and the distance from the inner top hole to both ends of the inner cylinder body 21 is equal. The bottom surface of the inner cylinder body 21 is provided with an inner bottom hole 211 penetrating to its cylinder hole. The fixed cylinder 23 is disposed in the inner top hole and the cylinder hole of the inner cylinder body 21. The inner bottom hole corresponds to the laser emitter 22, so that the laser light from the laser emitter 22 can pass through the inner bottom hole 211 and the light-transmitting hole 112 in sequence. This structure keeps the center of gravity of the inner cylinder device 2 on the axis of the fixed cylinder 23, preventing the center of gravity from shifting and causing the laser to deviate in the second direction. In addition, the bottom surface of the fixed cylinder 23 and the bottom surface of the laser emitter 22 can press against the wall of the hole of the inner cylinder body 21, and the outer wall of the fixed cylinder 23 can abut against the wall of the inner top hole. Furthermore, the fixed cylinder 23 can be fixedly connected to the inner cylinder body 21, or it can be clearance-fitted, transition-fitted, or interference-fitted with the inner top hole. The laser emitter 22 can be fixedly connected to the fixed cylinder 23, or it can be clearance-fitted or transition-fitted with the hole of the fixed cylinder 23.

[0026] Furthermore, the weight above the axis of the inner cylinder 21 is greater than the weight below its axis, thus lowering the center of gravity of the inner cylinder 21. This can be achieved by reducing the wall thickness of the upper part of the inner cylinder 21 and increasing the wall thickness of the lower part, or by removing a portion of the upper part of the inner cylinder 21. Furthermore, the inner cylinder 21 is a horizontally positioned cylinder, with inlet notches 212 extending along the second direction at both ends. The cross-sectional projection of the inlet notches 212 perpendicular to the second direction is triangular, and the distance between the tops of the two inlet notches 212 is less than the distance between the bottoms of the two inlet notches 212, making the cross-sectional shape of the inner cylinder 21 perpendicular to the second direction an isosceles trapezoid, thereby lowering the center of gravity of the inner cylinder 21.

[0027] Furthermore, the inner cylinder device 2 also includes two counterweights 24. The two counterweights 24 are disposed on the bottom surface of the cylinder hole of the inner cylinder body 21 or on the bottom surface of the inner cylinder body 21. The two counterweights 24 are symmetrically disposed on opposite sides of the laser emitter 22 along the first direction to lower the center of gravity of the inner cylinder device 2 and prevent the center of gravity from deviating in the horizontal direction. In addition, the aforementioned inner cylinder notch 212 makes it easier for production personnel to set the counterweights 24.

[0028] Furthermore, it also includes two rotating bearings 3, which are disposed within the receiving cavity 111. The axis of the rotating bearing 3 is parallel to the first direction. The two rotating bearings 3 are symmetrically disposed on opposite sides of the laser emitter 22 along the first direction. There is a rotation gap 113 between the receiving cavity 111 and the outer wall of the inner cylinder 21. The rotating bearing 3 is disposed in the rotation gap 113. The outer wall of the rotating bearing 3 abuts against the receiving cavity 111, and the inner wall of the rotating bearing 3 abuts against the outer wall of the inner cylinder 21, so that the inner cylinder 21 is rotatably connected to the outer cylinder 11.

[0029] Furthermore, the outer cylinder device 1 also includes a sealing plug 12. The top surface of the outer cylinder body 11 is provided with an outer top hole that penetrates the receiving cavity 111. The outer top hole corresponds to the inner top hole. The sealing plug 12 is detachably disposed in the outer top hole. The sealing plug 12 blocks the outer top hole, allowing maintenance personnel to open the sealing plug 12 to observe and inspect the interior of the receiving cavity 111. The width of the rotation gap 113 along the radial direction of the inner cylinder body 21 is smaller than the length of the laser emitter 22 along the vertical direction to prevent the laser emitter 22 from falling out of the cylinder hole of the fixing hole. The cross-sectional area of ​​the outer top hole and the rubber plug perpendicular to the vertical direction is larger than the cross-sectional area of ​​the laser emitter 22. The sealing plug 12, with a cross-sectional area perpendicular to the vertical direction, can be made of a soft material, such as rubber. By flipping the inner cylinder device 2, the laser emitter 22 can be directly placed on the sealing plug 12, and then the sealing plug 12 can be removed to safely and conveniently remove the laser emitter 22, facilitating the replacement and maintenance of the laser emitter 22. Furthermore, the outer cylinder device 1 also includes a side cover 14. The end faces of both ends of the outer cylinder body 11 are provided with side holes that penetrate into the receiving cavity 111. The side cover 14 is detachably installed in the side hole and blocks the side hole. The inner cylinder device 2 can be inserted into the receiving cavity 111 from the side holes on both sides to facilitate the installation of the inner cylinder device 2.

[0030] Furthermore, the outer cylinder 11 is a cylindrical body, and the light-transmitting hole 112 is an elongated hole. The two ends of the light-transmitting hole 112 along its length direction are symmetrically located on opposite sides of the outer cylinder 11 along the second direction, so that the laser can smoothly set the direction scale along the light-transmitting hole 112. The length of the light-transmitting hole 112 is less than half of the circumference of the side wall of the outer cylinder 11. When this parameter meets the maximum usage requirements, it can prevent the light-transmitting hole 112 from excessively weakening the strength of the outer cylinder 11.

[0031] Furthermore, the outer cylinder device 1 also includes a light-transmitting plate 13, which is disposed on the outer side wall of the outer cylinder body 11 corresponding to the light-transmitting hole 112. The light-transmitting plate 13 blocks the light-transmitting hole 112. The light-transmitting plate 13 is made of transparent material to seal the receiving cavity 111 while allowing the laser to pass through the light-transmitting plate 13.

[0032] Furthermore, by placing the containment cavity 111 in a sealed environment, it is possible to prevent substances such as seawater from entering the containment cavity 111 and corroding the rotating bearing 3 and the inner cylinder device 2. Corrosion would reduce the accuracy of the test device.

[0033] Furthermore, the outer cylinder device 1 also includes a plurality of fixing ears 15, each fixing ear 15 having a through fixing hole. The fixing ears 15 are all located on the outer side wall of the outer cylinder body 11, and the two sets of fixing ears 15 are respectively located on opposite sides of the outer cylinder body 11 along the second direction, so as to fix the outer cylinder device 1 by bolts, screws or ropes and other connecting parts.

[0034] Furthermore, the specific connection methods of fixed setting and fixed connection refer to the methods that can fix the relative positional relationship of two connected components, including fixing by connectors, fixing by welding, fixing by adhesive, fixing by integral molding, and fixing by snap-fit ​​connection.

[0035] Furthermore, the specific connection method of detachable connection refers to the fact that the two connected parts can be repeatedly disassembled and assembled without damage or serious deformation, including fixing by connectors and fixing by snap-fit ​​connection.

[0036] Furthermore, a rotating connection refers to a connection between two parts that can rotate, including connections via bearings and connections via clearance fits.

[0037] Furthermore, the connectors include fasteners, straps, ropes, pneumatic connectors, hydraulic connectors, flanges, Velcro, and buttons.

[0038] In summary, the embodiments of the present invention provide a ship center of gravity testing device, the technical effects of which are as follows:

[0039] The outer cylinder body 11 of the outer cylinder device 1 is fixedly connected to the ship, and the inner cylinder device 2 is located in the receiving cavity 111 of the outer cylinder body 11. The laser emitter 22 of the inner cylinder device 2 is mounted on the inner cylinder body 21 of the inner cylinder device 2 with a downward orientation. The inner cylinder body 21 is rotatably connected to the outer cylinder body 11. The center of gravity of the inner cylinder device 2 is lower than the axis of the inner cylinder body 21, so that when the ship rolls from side to side and has an angle of inclination, the laser emitter 22 can maintain a downward orientation. Furthermore, the bottom surface of the outer cylinder body 11 is provided with a light-transmitting hole 112 corresponding to the laser emitter 22, so that the laser emitted by the laser emitter 22 can be emitted outward through the light-transmitting hole 112. Specifically, the laser is directly shone on the scale, so that the test personnel can record the laser landing point by camera or identify the laser landing point by human eye to obtain the ship's rolling amplitude. In addition, the device of the present invention is less affected by external factors (wind and vibration have less impact on the device), so the device of the present invention has high accuracy in testing.

[0040] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A device for testing the center of gravity of a ship, characterized in that, The device includes an outer cylinder assembly (1) and an inner cylinder assembly (2). The outer cylinder assembly (1) includes an outer cylinder body (11) with a receiving cavity (111). The inner cylinder assembly (2) includes an inner cylinder body (21) and a laser emitter (22). The inner cylinder body (21) is located within the receiving cavity (111) and is rotatably connected to the outer cylinder body (11). The inner cylinder body (21) can rotate along its axial direction. The line is parallel to the first direction. The center of gravity of the inner cylinder device (2) is lower than the axis of the inner cylinder body (21). The laser emitter (22) is located on the inner cylinder body (21) and faces downward. The bottom surface of the outer cylinder body (11) is provided with a light-transmitting hole (112) corresponding to the laser emitter (22). The light-transmitting hole (112) penetrates into the receiving cavity (111) and extends to both sides of the outer cylinder body (11) along the second direction. The weight below the axis of the inner cylinder (21) is greater than the weight above its axis. The inner cylinder body (21) is a horizontally arranged cylinder. Both ends of the inner cylinder body (21) are provided with inner cylinder notches (212) that extend along the second direction. The cross-sectional projection shape of the inner cylinder notches (212) perpendicular to the second direction is triangular. The distance between the tops of the two inner cylinder notches (212) is less than the distance between the bottoms of the two inner cylinder notches (212). The inner cylinder device (2) also includes two counterweights (24), which are located on the bottom surface of the cylinder hole of the inner cylinder body (21) or on the bottom surface of the inner cylinder body (21). The two counterweights (24) are symmetrically located on opposite sides of the laser emitter (22) along the first direction. The inner cylinder device (2) also includes a vertically arranged fixed cylinder (23), the laser emitter (22) is disposed in the cylinder hole of the fixed cylinder (23), the top surface of the inner cylinder body (21) is provided with an inner top hole that penetrates to its cylinder hole, the distance from the inner top hole to both ends of the inner cylinder body (21) is equal, the bottom surface of the inner cylinder body (21) is provided with an inner bottom hole (211) that penetrates to its cylinder hole, the fixed cylinder (23) is disposed in the inner top hole and the cylinder hole of the inner cylinder body (21), and the inner bottom hole corresponds to the laser emitter (22); The fixed cylinder (23) is fixedly connected to the inner cylinder body (21), and the laser emitter (22) is fixedly connected to the fixed cylinder (23).

2. The ship center of gravity testing apparatus according to claim 1, characterized in that, It also includes two rotating bearings (3), which are disposed in the receiving cavity (111). The axis of the rotating bearing (3) is parallel to the first direction. The two rotating bearings (3) are symmetrically disposed on opposite sides of the laser emitter (22) along the first direction. There is a rotation gap (113) between the receiving cavity (111) and the outer wall of the inner cylinder (21). The rotating bearing (3) is disposed in the rotation gap (113). The outer wall of the rotating bearing (3) abuts against the receiving cavity (111), and the inner wall of the rotating bearing (3) abuts against the outer wall of the inner cylinder (21).

3. The ship center of gravity testing device according to claim 2, characterized in that, The outer cylinder device (1) further includes a sealing plug (12). The top surface of the outer cylinder body (11) is provided with an outer top hole that penetrates the receiving cavity (111). The outer top hole is provided corresponding to the inner top hole. The sealing plug (12) is detachably provided in the outer top hole. The sealing plug (12) blocks the outer top hole. The width of the rotation gap (113) along the radial direction of the inner cylinder body (21) is smaller than the length of the laser emitter (22) along the vertical direction. The outer cylinder device (1) also includes a side cover (14). The end faces of both ends of the outer cylinder body (11) are provided with side holes that penetrate into the receiving cavity (111). The side cover (14) is detachably installed in the side hole and the side cover (14) blocks the side hole.

4. The ship center of gravity testing apparatus according to claim 1, characterized in that, The outer cylinder (11) is a cylinder, and the light-transmitting hole (112) is an elongated hole. The two ends of the light-transmitting hole (112) along its length direction are symmetrically located on opposite sides of the outer cylinder (11) along the second direction. The length of the light-transmitting hole (112) is less than half of the circumference of the side wall of the outer cylinder (11).

5. The ship center of gravity testing apparatus according to claim 1 or 4, characterized in that, The outer cylinder device (1) also includes a light-transmitting plate (13), which is disposed on the outer side wall of the outer cylinder body (11) corresponding to the light-transmitting hole (112). The light-transmitting plate (13) blocks the light-transmitting hole (112) and is made of transparent material.

6. The ship center of gravity testing apparatus according to claim 1, characterized in that, The outer cylinder device (1) also includes a plurality of fixing ears (15), each fixing ear (15) having a through fixing hole. The fixing ears (15) are all located on the outer side wall of the outer cylinder body (11), and the two sets of fixing ears (15) are respectively located on opposite sides of the outer cylinder body (11) along the second direction.

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