Longitudinal damping device for ship long shafting

Abstract

The invention relates to the technical field of ship long shafting, and discloses a ship long shafting longitudinal damping device which comprises a ship shafting, a damping mechanism and an adjusting mechanism are arranged below the ship shafting, and the damping mechanism is located on the surface of the adjusting mechanism; the vibration reduction mechanism comprises a supporting assembly and a vibration reduction assembly. The damping assembly is located on the surface of the supporting assembly. Different positions of the ship shafting are supported by two supporting frames and two connecting ring plates through the vibration reduction mechanism and the supporting assembly, so that the vibration reduction positions of the ship shafting are increased, the ship shafting makes contact with the connecting ring plates, when the ship shafting vibrates, the vibration reduction frequency band obtained by the connecting ring plates is wide, high, medium and low frequency vibration of the ship shafting is well considered, and the vibration reduction effect is good. The device is simple in structure and suitable for being applied to complex vibration working conditions, the vibration reduction assembly achieves the vibration reduction effect on the supporting plate through the damping performance of the damper and the acting force of the spring, and therefore the vibration reduction effect on the ship shafting is achieved, and the longitudinal vibration reduction effect of the device on the ship long shafting is improved.

Description

Technical Field

[0001] The invention relates to the technical field of long shaft systems of ships, and in particular to a longitudinal vibration reduction device for long shaft systems of ships. Background Art

[0002] The long shaft system of a ship is the shaft system from the main engine to the propeller, and is usually composed of several sections of shafts connected to each other in the same straight line. This system is an important part of the ship's power plant and is crucial to the ship's maneuverability and mobility. The longer the long shaft system of a ship, the more serious the longitudinal vibration will be, which will affect the stability of the shaft system and reduce the life of the shaft system. Due to limited conditions during the design process, it is impossible to accurately predict and difficult to detect in the design stage. Longitudinal vibration is often found during the trial voyage after the ship is built, especially the longitudinal vibration of the long shaft system.

[0003] According to a shaft bearing vibration reduction base published by a Chinese patent, the publication number is CN105840729A, which includes a shaft and a bulkhead supporting the shaft, a pair of adapter sleeves are mounted on the shaft, the top of the adapter sleeve is provided with a thread, a bearing is mounted on the adapter sleeve, the inner ring of the bearing is pressed by a locking nut, a base body is mounted on the outside of the bearing, and a transparent cover is provided at both ends of the base body, and a dust ring is provided between the transparent cover and the shaft, and also includes a pair of truncated cone-shaped vibration reduction covers mounted on the outside of the base body, the vibration reduction covers are fixed on the base body, and the bottom of the vibration reduction covers is installed on the bulkhead through an annular flange, and the vibration reduction covers are multi-layer connectors composed of a metal wire mesh block layer and an elastic metal diaphragm layer. The present invention can be used in ship propulsion shaft systems, is easy to install, occupies a small space, has the dual functions of vibration reduction of the lateral and radial vibrations of the shaft system and water sealing between cabins, is suitable for harsh environments with high temperature and oil pollution in ship cabins, and has a long service life and good vibration reduction effect compared to traditional vibration reduction devices such as rubber; In the device, the vibration reduction base is installed on the transmission shaft. When the transmission shaft vibrates, the wire mesh block of the vibration reduction cover generates dry friction damping due to slippage between the wires under the action of load, thereby absorbing and dissipating the vibration energy of the system, playing a role of buffering and vibration isolation. However, the existing device still has the following problems: the device must reach a certain amount of positive pressure on the contact surface of the wire mesh when the vibration reaches a medium and high frequency, so that the wire mesh block can slip and friction damping can consume the vibration energy. If the positive pressure is not enough, the wire mesh will only generate static friction, and the slippage phenomenon will not occur, and the device will have no vibration reduction effect. Therefore, a longitudinal vibration reduction device for a ship's long shaft system is proposed. Summary of the invention

[0004] The object of the present invention is to provide a longitudinal vibration reduction device for a ship's long shaft system to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a longitudinal vibration reduction device for a ship's long shaft system, comprising a ship's shaft system, a vibration reduction mechanism and an adjustment mechanism are arranged below the ship's shaft system, and the vibration reduction mechanism is located on the surface of the adjustment mechanism; The vibration reduction mechanism comprises a support assembly and a vibration reduction assembly; The vibration reduction component is located on the surface of the support component; The support assembly includes two support frames, the two support frames are symmetrically arranged, support plates and connecting ring plates are arranged inside the two support frames, and the right end surface of the ship shaft system passes through the left sides of the two connecting ring plates and extends to the right sides of the two connecting ring plates; The vibration reduction assembly includes a damper, which is located on a support plate. There are four dampers under the support plate. A push rod, a sliding rod and a slider are arranged under the support plate. Two push rods and two sliders are symmetrically arranged, and springs are arranged on the outside of the two sliders.

[0006] Preferably, the top surface of the support plate is fixedly connected to the bottom surface of the connecting ring plate, and the surface of the ship shaft system is in contact with the inner wall of the connecting ring plate.

[0007] Preferably, the top end surface of the push rod is hinged to the bottom surface of the support plate, the bottom end surface of the push rod is hinged to the top surface of the slider, the side surface of the support plate is slidably connected to the inner side surface of the support frame, and when the support plate vibrates, the push rod is squeezed, so that the push rod pushes the slider to move on the slide rod.

[0008] Preferably, the rear end surface of the slide bar slides through the front side surfaces of the two sliders and extends to the rear sides of the two sliders. The front and rear end surfaces of the slide bar are respectively fixedly connected to the inner side surfaces of the support frame, and the slide bar facilitates the sliding of the slider thereon.

[0009] Preferably, the front and rear end surfaces of the spring are fixedly connected to the inner side surface of the support frame and the front side surface of the slider respectively, the spring is sleeved on the surface of the slide rod, the bottom surface of the damper is fixedly connected to the inner bottom surface of the support frame, and the top end surface of the damper output rod is fixedly connected to the bottom surface of the support plate, and the damping property of the damper itself has a vibration reduction effect on the support plate.

[0010] Preferably, the adjusting mechanism includes a base, a motor is fixedly connected to the front side of the base, a cavity is opened inside the base, the rear end face of the motor output rod passes through the front side of the base and extends into the cavity, the rear end face of the motor output rod is fixedly connected to a rotating rod, a double-headed threaded rod is provided on the rear side of the rotating rod, a bevel gear is fixedly sleeved on the surface of the rotating rod and the rear end face of the double-headed threaded rod, the two bevel gears are meshed with each other on the inclined surfaces, two movable plates are provided inside the cavity, the two movable plates are symmetrically arranged, a slide groove is opened through the top surface of the base, the top end face of the movable plate slides through the inner wall of the cavity and the inner wall of the slide groove to extend to above the base, and the top end face of the movable plate is fixedly connected to the bottom surface of the support frame.

[0011] Preferably, the thread on the left end face of the double-headed threaded rod passes through the right side faces of the two movable plates and extends to the left side faces of the two movable plates. The left and right end faces of the double-headed threaded rod are rotatably connected to the inner wall of the cavity through bearing seats respectively. The bottom surface of the movable plate is slidably connected to the bottom surface of the cavity, and the two movable plates are driven to move by the double-headed threaded rod.

[0012] Preferably, a connecting plate is provided under the motor, the rear side surface of the connecting plate is fixedly connected to the front surface of the base, the top surface of the connecting plate is fixedly connected to a vibration-damping pad, the top surface of the vibration-damping pad contacts the bottom surface of the motor, and the vibration-damping pad can reduce the vibration of the motor, thereby avoiding increasing the vibration of the ship's shaft system.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: the longitudinal vibration reduction device for the long shaft system of the ship, through the vibration reduction mechanism, the support assembly uses two support frames and two connecting ring plates to support different positions of the ship shaft system, thereby increasing the vibration reduction position of the ship shaft system, the ship shaft system is in contact with the connecting ring plate, so that when the ship shaft system vibrates, the vibration reduction frequency band obtained by the connecting ring plate is relatively wide, and the high, medium and low frequency vibrations of the ship shaft system are well taken into account, and it is suitable for use in complex vibration conditions, the vibration reduction assembly uses the damping property of the damper itself and the spring force to achieve a vibration reduction effect on the support plate, thereby achieving a vibration reduction effect on the ship shaft system, and improving the longitudinal vibration reduction effect of the device on the long shaft system of the ship; through the adjustment mechanism, the two moving plates are driven to move by the double-headed threaded rod, so that the moving plate adjusts the distance between the two support frames, so that the connecting ring plate is in contact with different positions of the ship shaft system, which is convenient for vibration reduction of ship shaft systems of different lengths, and improves the use range of the vibration reduction device for the long shaft system of the ship; through the vibration reduction pad, the vibration of the motor can be reduced, thereby avoiding the increase of the vibration of the ship shaft system caused by the vibration of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is the overall main stereoscopic diagram of the present invention; Figure 2 It is a left-side stereoscopic view of the slide bar of the present invention; Figure 3 It is a left side cutaway perspective view of the slide bar of the present invention; Figure 4 It is a rear perspective view of the double-threaded rod of the present invention; Figure 5 It is a rear side cutaway stereoscopic view of the double-threaded rod of the present invention; Figure 6 It is a top-side sectional stereoscopic view of the double-start threaded rod of the present invention.

[0015] In the figure: ship shaft system 1, vibration reduction mechanism 2, support frame 201, support plate 202, connecting ring plate 203, push rod 204, slider 205, slide bar 206, spring 207, damper 208, adjustment mechanism 3, base 301, connecting plate 302, vibration reduction pad 303, motor 304, rotating rod 305, double-headed threaded rod 306, bevel gear 307, moving plate 308. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Embodiment 1

[0017] See also Figure 1 - Figure 6 The present invention provides a technical solution: a longitudinal vibration reduction device for a ship long shaft system, comprising a ship shaft system 1, a vibration reduction mechanism 2 and an adjustment mechanism 3 are arranged below the ship shaft system 1, and the vibration reduction mechanism 2 is located on the surface of the adjustment mechanism 3; The vibration reduction mechanism 2 includes a support component and a vibration reduction component; The vibration reduction component is located on the surface of the support component; The support assembly includes two support frames 201, the two support frames 201 are symmetrically arranged, and support plates 202 and connecting ring plates 203 are arranged inside the two support frames 201. The right end surface of the ship shaft system 1 passes through the left side surfaces of the two connecting ring plates 203 and extends to the right side of the two connecting ring plates 203; The vibration reduction assembly includes a damper 208, which is located on the support plate 202. There are four dampers 208 under the support plate 202. A push rod 204, a slide rod 206 and a slider 205 are arranged under the support plate 202. There are two push rods 204 and two sliders 205 symmetrically arranged. Springs 207 are arranged on the outside of the two sliders 205. The top surface of the support plate 202 is fixedly connected to the bottom surface of the connecting ring plate 203. The surface of the ship shaft system 1 contacts the inner wall of the connecting ring plate 203. The top surface of the push rod 204 is hinged to the bottom surface of the support plate 202. The bottom surface of the push rod 204 is hinged to the top surface of the slider 205. The side surface of the support plate 202 is slidably connected to the inner side surface of the support frame 201. The rear end surface of the slide rod 206 slides through the front side surfaces of the two sliders 205 and extends to the rear side of the two sliders 205. The front and rear end surfaces of the slide rod 206 are respectively fixedly connected to the inner side surface of the support frame 201. The front and rear end surfaces of the spring 207 are respectively connected to the support frame 2 01 inner side surface and the front side surface of the slider 205 are fixedly connected, the spring 207 is sleeved on the surface of the slide bar 206, the bottom surface of the damper 208 is fixedly connected to the inner bottom surface of the support frame 201, and the top surface of the damper 208 output rod is fixedly connected to the bottom surface of the support plate 202. Through the vibration reduction mechanism 2, the support component uses two support frames 201 and two connecting ring plates 203 to support different positions of the ship shaft system 1, thereby increasing the vibration reduction position of the ship shaft system 1. The ship shaft system 1 is in contact with the connecting ring plate 203, so that when the ship shaft system 1 vibrates, the vibration reduction frequency band obtained by the connecting ring plate 203 is relatively wide, which well takes into account the high, medium and low frequency vibrations of the ship shaft system 1, and is suitable for use in complex vibration conditions. The vibration reduction component uses the damping property of the damper 208 itself and the force of the spring 207 to reduce the vibration of the support plate 202, thereby reducing the vibration of the ship shaft system 1, and improving the longitudinal vibration reduction effect of the device on the long shaft system of the ship. Embodiment 2

[0018] On the basis of the first embodiment, a preferred embodiment of the longitudinal vibration reduction device for a ship long shaft provided by the present invention is as follows: Figure 1 , Figure 4 - Figure 6As shown: the adjustment mechanism 3 includes a base 301, a motor 304 is fixedly connected to the front of the base 301, a cavity is opened inside the base 301, the rear end face of the output rod of the motor 304 passes through the front of the base 301 and extends to the inside of the cavity, the rear end face of the output rod of the motor 304 is fixedly connected to a rotating rod 305, a double-headed threaded rod 306 is arranged on the rear side of the rotating rod 305, and a bevel gear 307 is fixedly sleeved on the surface of the rotating rod 305 and the rear end face of the double-headed threaded rod 306, the two bevel gears 307 are meshed with bevels, two moving plates 308 are arranged inside the cavity, and the two moving plates 308 are symmetrically arranged, a slide groove is opened through the top surface of the base 301, and the top end surface of the moving plate 308 slides through the inner wall of the cavity and the inner wall of the slide groove and extends to the base 301 At the top, the top surface of the movable plate 308 is fixedly connected to the bottom surface of the support frame 201, and the left end surface of the double-headed threaded rod 306 is threaded through the right side surfaces of the two movable plates 308 and extends to the left side of the two movable plates 308. The left and right end surfaces of the double-headed threaded rod 306 are respectively rotatably connected to the inner wall of the cavity through the bearing seat, and the bottom surface of the movable plate 308 is slidably connected to the bottom surface of the cavity. Through the adjustment mechanism 3, the double-headed threaded rod 306 is used to drive the two movable plates 308 to move, so that the movable plate 308 adjusts the distance between the two support frames 201, so that the connecting ring plate 203 contacts different positions of the ship shaft system 1, which is convenient for vibration reduction of ship shaft systems 1 of different lengths, and improves the use range of the vibration reduction device for long ship shaft systems; A connecting plate 302 is provided below the motor 304, the rear side of the connecting plate 302 is fixedly connected to the front side of the base 301, the top surface of the connecting plate 302 is fixedly connected to a vibration-damping pad 303, the top surface of the vibration-damping pad 303 is in contact with the bottom surface of the motor 304, and the vibration of the motor 304 can be reduced through the vibration-damping pad 303, thereby preventing the vibration of the motor 304 from increasing the vibration of the ship's shaft system 1.

[0019] When in use, the base 301 is moved so that the ship shaft system 1 passes through the two connecting ring plates 203, the motor 304 is turned on, and the output rod of the motor 304 drives the connected rotating rod 305 to rotate, so that the rotating rod 305 drives the connected bevel gear 307 to rotate, and the two bevel gears 307 are meshed and driven to rotate the double-headed threaded rod 306, and the double-headed threaded rod 306 drives the two connected moving plates 308 to move, and the moving plate 308 drives the support frame 201 to move, so as to adjust the distance between the two connecting ring plates 203, so that the two connecting ring plates 203 can be adjusted. The connecting ring plate 203 contacts different positions of the ship shaft system 1 to perform longitudinal vibration reduction on different positions of the ship shaft system 1; when the ship shaft system 1 vibrates, the connecting ring plate 203 vibrates and squeezes the connected support plate 202, and the support plate 202 pushes the damper 208 and the push rod 204, so that the push rod 204 pushes the two sliders 205 to move on the slide bar 206, and the slider 205 squeezes the connected spring 207, and the force of the spring 207 and the damping property of the damper 208 itself have a vibration reduction effect on the support plate 202, thereby having a longitudinal vibration reduction effect on the ship shaft system 1.

[0020] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A longitudinal vibration reduction device for a ship's long shaft system, comprising a ship's shaft system (1), characterized in that: A vibration reduction mechanism (2) and an adjustment mechanism (3) are arranged below the ship shaft system (1), and the vibration reduction mechanism (2) is located on the surface of the adjustment mechanism (3); The vibration reduction mechanism (2) comprises a support component and a vibration reduction component; The vibration reduction component is located on the surface of the support component; The support assembly comprises two support frames (201), the two support frames (201) are symmetrically arranged, support plates (202) and connecting ring plates (203) are arranged inside the two support frames (201), and the right end surface of the ship shaft system (1) passes through the left sides of the two connecting ring plates (203) and extends to the right sides of the two connecting ring plates (203); The vibration reduction assembly comprises a damper (208), wherein the damper (208) is located on a support plate (202), and four dampers (208) are arranged below the support plate (202). A push rod (204), a sliding rod (206) and a sliding block (205) are arranged below the support plate (202), and two push rods (204) and two sliding blocks (205) are symmetrically arranged, and springs (207) are arranged on the outsides of the two sliding blocks (205).

2. A longitudinal vibration reduction device for a ship's long shaft system according to claim 1, characterized in that: The top surface of the support plate (202) is fixedly connected to the bottom surface of the connecting ring plate (203), and the surface of the ship shaft system (1) is in contact with the inner wall of the connecting ring plate (203).

3. A longitudinal vibration reduction device for a ship's long shaft system according to claim 1, characterized in that: The top end surface of the push rod (204) is hinged to the bottom surface of the support plate (202), the bottom end surface of the push rod (204) is hinged to the top surface of the slider (205), and the side surface of the support plate (202) is slidably connected to the inner side surface of the support frame (201).

4. A longitudinal vibration reduction device for a ship's long shaft system according to claim 1, characterized in that: The rear end surface of the slide bar (206) slides through the front side surfaces of the two sliders (205) and extends to the rear sides of the two sliders (205), and the front and rear end surfaces of the slide bar (206) are respectively fixedly connected to the inner side surface of the support frame (201).

5. A longitudinal vibration reduction device for a ship's long shaft system according to claim 1, characterized in that: The front and rear end surfaces of the spring (207) are respectively fixedly connected to the inner side surface of the support frame (201) and the front side surface of the slider (205); the spring (207) is sleeved on the surface of the slider (206); the bottom surface of the damper (208) is fixedly connected to the inner bottom surface of the support frame (201); and the top end surface of the output rod of the damper (208) is fixedly connected to the bottom surface of the support plate (202).

6. A longitudinal vibration reduction device for a ship's long shaft system according to claim 1, characterized in that: The adjusting mechanism (3) comprises a base (301), a motor (304) is fixedly connected to the front of the base (301), a cavity is provided inside the base (301), a rear end face of an output rod of the motor (304) passes through the front of the base (301) and extends into the cavity, a rotating rod (305) is fixedly connected to the rear end face of the output rod of the motor (304), a double-headed threaded rod (306) is arranged at the rear side of the rotating rod (305), and a surface of the rotating rod (305) and a double-headed threaded rod (306) are provided. The rear end surface of the threaded rod (306) is fixedly sleeved with a bevel gear (307), and the two bevel gears (307) are meshed with each other at an angle. Two movable plates (308) are arranged inside the cavity, and the two movable plates (308) are symmetrically arranged. A slide groove is provided through the top surface of the base (301), and the top end surface of the movable plate (308) slides through the inner wall of the cavity and the inner wall of the slide groove to extend above the base (301), and the top end surface of the movable plate (308) is fixedly connected to the bottom surface of the support frame (201).

7. A longitudinal vibration reduction device for a ship's long shaft system according to claim 6, characterized in that: The left end surface of the double-threaded rod (306) is threaded through the right side surfaces of the two movable plates (308) and extends to the left side of the two movable plates (308). The left and right end surfaces of the double-threaded rod (306) are rotatably connected to the inner wall of the cavity through bearing seats respectively, and the bottom surface of the movable plate (308) is slidably connected to the bottom surface of the cavity.

8. A longitudinal vibration reduction device for a ship's long shaft system according to claim 6, characterized in that: A connecting plate (302) is provided below the motor (304); the rear side surface of the connecting plate (302) is fixedly connected to the front surface of the base (301); the top surface of the connecting plate (302) is fixedly connected to a vibration-damping pad (303); and the top surface of the vibration-damping pad (303) is in contact with the bottom surface of the motor (304).

Images