A safety protection system for a ship vibration isolation device

Abstract

The present invention discloses a safety protection system for a ship vibration isolation device. The safety protection system includes: a central controller and an X-direction protection subsystem, a Y-direction protection subsystem, and a Z-direction protection subsystem connected to the central controller; the X-direction protection subsystem, the Y-direction protection subsystem, and the Z-direction protection subsystem are respectively installed on the bulkhead of the ship hull structure and correspond to the X-direction, Y-direction, and Z-direction of the ship vibration isolation device respectively; the X-direction protection subsystem can limit or lock and protect the X-direction tilt displacement of the ship vibration isolation device, the Y-direction protection subsystem can limit or lock and protect the Y-direction tilt displacement of the ship vibration isolation device, and the Z-direction protection subsystem can limit and lock and protect the Z-direction tilt displacement of the ship vibration isolation device.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration damping and isolation and safety protection of ship mechanical equipment, and particularly relates to a safety protection system for a ship vibration isolation device. Background Art

[0002] To control ship vibration and noise, vibration isolation devices such as floating raft vibration isolation devices are basically adopted for ship power system equipment and the like. To achieve good vibration isolation effect, low-frequency vibration isolators are mostly selected for the lower layer of the floating raft vibration isolation device. Currently, there is a trend that the frequency design of the vibration dampers in the lower layer of the floating raft vibration isolation device is getting lower and lower. It is difficult to ensure the swing stability and impact stability of the floating raft vibration isolation device only by the vibration isolators themselves. Usually, a limit system is attached to the floating raft vibration isolation device as a safety protection measure for the floating raft vibration isolation device to ensure the stability and safety of the floating raft vibration isolation device under external additional loads such as swing and impact loads.

[0003] The limit system of the floating raft vibration isolation device currently adopted is generally a passive limiter, and the limit gap of its limiter is generally fixed. Even if the limit gap of some limiters is adjustable, it can only be initially adjusted at the shipbuilding stage, and it is impossible to adjust it later or the adjustment is very difficult. Therefore, the traditional passive limit system has the following problems. First, the floating raft vibration isolation device is widely used on various submersibles, and the designed diving depth of submersibles is continuously increasing. The large diving depth will cause large deformation of the submersible hull. The limit system of the floating raft vibration isolation device is basically installed on the hull. The hull deformation caused by the diving depth will change the limit gap of the limiters in the limit system. Moreover, the limit system generally consists of multiple limiters, and the hull deformation differences at the installation positions of each limiter are relatively large. The changes in the limit gaps of each limiter in the limit system caused by the hull deformation due to the diving depth are also different everywhere. The uneven limit gaps of each limiter will cause the limit system to fail. At the same time, when the limit gap is reduced to zero, acoustic short circuit will occur, which will further cause the floating raft vibration isolation device to fail. Second, when the ship is sailing on the water surface, in high sea state conditions, the hull will swing periodically, which will drive the floating raft vibration isolation device and the power equipment on it to swing periodically. Moreover, the swings of the hull, the floating raft vibration isolation device and the power equipment on it are not synchronous, which will affect the operating safety of the power equipment on the floating raft vibration isolation device, especially for power equipment with shaft alignment requirements, and this problem is more obvious. Therefore, aiming at the above defects of the limit system of the floating raft vibration isolation device, it is necessary to propose a new safety protection system for the floating raft vibration isolation device that can adapt to hull deformation. Summary of the Invention

[0004] In view of this, the present invention provides a safety protection system for a ship vibration isolation device, which can adapt to hull deformation, and can limit or lock the floating raft vibration isolation device to ensure that the vibration isolation device for ships meets the safety requirements within the designed diving depth range of the ship and in high sea state conditions on the water surface.

[0005] The technical solution of the present invention is as follows: a safety protection system for a ship vibration isolation device, the safety protection system includes: a central controller and an X-direction protection subsystem, a Y-direction protection subsystem, and a Z-direction protection subsystem connected to the central controller; the X-direction protection subsystem, the Y-direction protection subsystem, and the Z-direction protection subsystem are respectively installed on the bulkhead of the ship hull structure, and respectively correspond to the X-direction, Y-direction, and Z-direction of the ship vibration isolation device; the X-direction protection subsystem can limit or lock and protect the X-direction tilting displacement of the ship vibration isolation device, the Y-direction protection subsystem can limit or lock and protect the Y-direction tilting displacement of the ship vibration isolation device, and the Z-direction protection subsystem can limit and lock and protect the Z-direction tilting displacement of the ship vibration isolation device.

[0006] Preferably, the X-direction protection subsystem, the Y-direction protection subsystem, and the Z-direction protection subsystem have the same structure, each including four protection units, and the four protection units in the X-direction protection subsystem are respectively arranged on the left and right sides of the bow and stern of the ship hull structure in the X-direction, the four protection units in the Y-direction protection subsystem are respectively arranged on the left and right sides of the bow and stern of the ship hull structure in the Y-direction, and the four protection units in the Z-direction protection subsystem are respectively arranged on the left and right sides of the bow and stern of the ship hull structure in the Z-direction.

[0007] Preferably, the ship vibration isolation device adopts a floating raft vibration isolation device.

[0008] Preferably, the four protection units in each protection subsystem have the same structure, and each protection unit includes: a hydraulic cylinder, a displacement sensor, an actuating mechanism, and a planar sliding device;

[0009] The hydraulic cylinder is installed on the bulkhead of the ship hull structure, one end of the actuating mechanism is installed in the hydraulic cylinder, the other end faces the floating raft vibration isolation device, and a planar sliding device is connected to the end of this end. The displacement sensor is arranged on the end face of the hydraulic cylinder opposite to the floating raft vibration isolation device, and is used to detect the tilting displacement of the floating raft vibration isolation device relative to the ship hull structure in a set direction and transmit it to the central controller; when the tilting displacement is greater than the set value, the central controller controls the hydraulic cylinder to drive the actuating mechanism to extend, so that the planar sliding device at the end of the actuating mechanism contacts or presses the floating raft vibration isolation device, thereby limiting or locking its set direction.

[0010] Preferably, each protection unit further includes: a stop block; a stop block is provided on the outer surface of the end of the actuating mechanism extending into the hydraulic cylinder, and is used to limit the actuating mechanism when it extends outward to a set position.

[0011] Preferably, the planar sliding device is detachably connected to the end of the actuating mechanism.

[0012] Preferably, the planar sliding device includes: a base, a bottom plate, and a positioning spring. The base is installed at the end of the actuating mechanism, and a groove is provided on the side facing the floating raft vibration isolation device. Both sides of the bottom plate are supported on two opposite inner sidewalls of the groove in the base by the positioning spring. One end is in sliding fit with the inner bottom surface of the groove of the base through more than two spherical structures, and the other end faces the floating raft vibration isolation device.

[0013] Preferably, the planar sliding device further includes: a buffer block, which is arranged at the end of the base opposite to the floating raft vibration isolation device and is used for buffering the contact between the base and the floating raft vibration isolation device.

[0014] Beneficial effects:

[0015] 1. The safety protection system of the present invention can adapt to the deformation of the hull and limit or lock the floating raft vibration isolation device. That is, when the ship is sailing on the water surface in high sea state or underwater in high speed state, the floating raft vibration isolation device is locked for protection. When the ship is in low working condition and low noise state on the water surface or underwater, the floating raft vibration isolation device is limited for protection, and automatic switching between the two protection states can be realized.

[0016] 2. The three-way protection subsystems in the safety protection system of the present invention have the same structure and each includes four protection units. It can not only adapt to the deformation of the hull in multiple directions to limit or lock the ship vibration isolation device, but also enhance the interchangeability between the protection units, which is convenient for overall installation.

[0017] 3. The specific setting of each protection unit in the present invention has a simple structure and can accurately limit or lock the ship vibration isolation device (floating raft vibration isolation device).

[0018] 4. The setting of the stop block in the present invention can limit the extension length of the actuating mechanism relative to the hydraulic cylinder, thereby further ensuring the safety and reliability of the entire safety protection system.

[0019] 5. The specific setting of the planar sliding device in the present invention can not only contact or press the floating raft vibration isolation device, but also slide on the floating raft vibration isolation device within a set small range, enhancing the ability of the safety protection system to adapt to the deformation of the hull. Description of the Drawings

[0020] Figure 1 It is the composition hierarchy diagram of the safety protection system of the present invention.

[0021] Figure 2 It is the layout diagram of the safety protection system of the present invention, (1) top view, (2) left view.

[0022] Figure 3 It is the structural schematic diagram of the protection unit in the present invention.

[0023] Among them, 1 - hull structure, 2 - hydraulic cylinder, 3 - stop block, 4 - oil inlet, 5 - oil outlet, 6 - displacement sensor, 7 - actuating mechanism, 8 - base, 9 - bottom plate, 10 - buffer block, 11 - positioning spring, 12 - floating raft vibration isolation device. Detailed implementation manner

[0024] The present invention will be described in detail below with reference to the accompanying drawings and by way of examples.

[0025] This embodiment provides a safety protection system for a ship vibration isolation device, which can adapt to the deformation of the hull and can limit or lock the floating raft vibration isolation device to ensure that the ship vibration isolation device meets the safety requirements within the designed diving depth range of the ship and under high sea conditions on the water surface.

[0026] The relative movement of the floating raft vibration isolation device 12 relative to the hull structure 1 is three-dimensional (X-direction, Y-direction, and Z-direction), and the external loads it may receive are also three-dimensional. Therefore, a three-dimensional decoupling idea is adopted to set up a safety protection system for the floating raft vibration isolation device 12, and the safety protection system is independently set in three directions;

[0027] As Figure 1 shown, the safety protection system includes: a central controller and an X-direction protection subsystem, a Y-direction protection subsystem, and a Z-direction protection subsystem connected to the central controller; as Figure 2 shown, the X-direction protection subsystem, the Y-direction protection subsystem, and the Z-direction protection subsystem are respectively installed on the bulkhead of the hull structure 1 and respectively correspond to the X-direction, Y-direction, and Z-direction of the floating raft vibration isolation device 12 (installed in the hull structure 1); among them, the X-direction protection subsystem, the Y-direction protection subsystem, and the Z-direction protection subsystem have the same structure except for the installation orientation, and each includes four protection units. The four protection units in the X-direction protection subsystem are respectively arranged on the left and right sides of the bow and stern of the hull structure 1 in the X-direction, the four protection units in the Y-direction protection subsystem are respectively arranged on the left and right sides of the bow and stern of the hull structure 1 in the Y-direction, and the four protection units in the Z-direction protection subsystem are respectively arranged on the left and right sides of the bow and stern of the hull structure 1 in the Z-direction;

[0028] Taking the Y-direction protection subsystem as an example, it only performs Y-direction limiting or locking in real time and is decoupled from the X-direction and Z-direction; the Y-direction protection subsystem includes: four protection units, and the four protection units have the same structure but are distributed at the four corners of the XOZ plane of the floating raft vibration isolation device 12. As Figure 3 shown, taking one of the protection units as an example for description, it includes: a hydraulic cylinder 2, a stop block 3, a displacement sensor 6, an actuating mechanism 7, and a planar sliding device;

[0029] The hydraulic cylinder 2 is installed on the bulkhead of the hull structure 1. One end of the actuating mechanism 7 is installed in the hydraulic cylinder 2 and serves as the hydraulic rod of the hydraulic cylinder 2. The other end faces the floating raft vibration isolation device 12, and a planar sliding device is detachably connected to the end of this other end. The displacement sensor 6 is arranged on the end face of the hydraulic cylinder 2 opposite to the floating raft vibration isolation device 12 for detecting the tilt displacement amount of the floating raft vibration isolation device 12 relative to the hull structure 1 in the Y direction;

[0030] Among them, a stop block 3 is provided on the outer surface of the end of the actuating mechanism 7 extending into the hydraulic cylinder 2 for limiting the actuating mechanism 7 when it extends outward to a set position; The planar sliding device includes: a base 8, a bottom plate 9, a buffer block 10 and a positioning spring 11. The base 8 is detachably installed at the end of the actuating mechanism 7 through bolts. A groove is provided on the side facing the floating raft vibration isolation device 12. Both sides of the bottom plate 9 are supported in the two opposite inner side walls of the groove in the base 8 through the positioning spring 11. One end is in sliding fit with the inner bottom surface of the groove of the base 8 through more than two spherical structures, and the other end faces the floating raft vibration isolation device 12. The buffer block 10 is arranged at the end of the base 8 opposite to the floating raft vibration isolation device 12 for buffering the contact between the base 8 and the floating raft vibration isolation device 12;

[0031] When the diving depth of the ship changes, the relative position between the hull structure 1 and the floating raft vibration isolation device 12 will change, and this change amount is provided as an input to the central controller of the safety protection system; The central controller drives the external hydraulic source to input hydraulic oil into the hydraulic cylinder 2 or extract hydraulic oil from the hydraulic cylinder 2 according to parameters such as the navigation state of the ship, the external environment, and the above-mentioned tilt displacement amount, so as to control the extension or retraction of the actuating mechanism 7 in the Y direction. When the actuating mechanism 7 extends in the Y direction, the Y-direction locking or limiting of the floating raft vibration isolation device 12 can be realized. When the actuating mechanism 7 retracts in the Y direction, the Y-direction unlocking or removal of the limit of the floating raft vibration isolation device 12 can be realized; At the same time, in the locking protection state, the protection unit can realize the planar sliding between the contact surfaces of the actuating mechanism 7 and the floating raft vibration isolation device 12; Among them, an oil inlet 4 and an oil outlet 5 are provided on the hydraulic cylinder 2. When oil is inlet, the internal pressure of the hydraulic cylinder 2 increases, pushing the actuating mechanism 7 to extend out of the hydraulic cylinder 2. When oil is outlet, the internal pressure of the hydraulic cylinder 2 decreases, enabling the actuating mechanism 7 to retract into the hydraulic cylinder 2; Among them, the central controller has a built-in control program and can drive the external hydraulic source to input hydraulic oil into the hydraulic cylinder 2 according to the tilt displacement amount input into it by the displacement sensor 6, so as to control the extension of the actuating mechanism 7 in the Y direction.

[0032] Taking the Y-direction protection subsystem as an example, the working principle of this safety protection system is described as follows:

[0033] 1. Water surface state

[0034] a) Water surface locking: The ship is floating on the water surface, the raft vibration isolation device 12 is in the zero position state, the action mechanism 7 in each protection unit of the Y-axis protection subsystem extends outward from the hydraulic cylinder 2 to the maximum stroke (limited by the internal stop block 3), the bottom plate 9 in the plane sliding device is in rigid contact with the raft vibration isolation device 12 (the buffer block 10 is compressed), and by adjusting the opening and closing of the oil inlet 4 and the oil outlet 5 of the hydraulic cylinder 2, it is ensured that the protection units on the left and right sides of the hull structure 1 symmetrically squeeze the raft vibration isolation device 12. In the water surface rolling state, due to the incompressibility of the hydraulic oil, the raft vibration isolation device 12 will not produce Y-axis movement relative to the hull, so that the raft vibration isolation device 12 is locked in the Y direction;

[0035] b) Water surface limit: The action mechanism 7 in each protection unit of the Y-axis protection subsystem extends out from the hydraulic cylinder 2 to the buffer block 10 in the plane sliding device, which just contacts the floating raft vibration isolation device 12 but is not compressed. This state is the initial device for limit, which can play the role of Y-axis limit; the bottom plate 9 in the plane sliding device of the protection unit and the contact surface of the floating raft vibration isolation device 12 can slide freely to adapt to the relative displacement between the hull structure 1 and the floating raft vibration isolation device 12 in the X-axis and Z-axis directions;

[0036] c) By adjusting the oil inlet and outlet of the hydraulic cylinder 2, free switching between the locking state and the limit state can be achieved, and the switching time is less than 3 seconds.

[0037] 2. Underwater status

[0038] a) Underwater locking state I: When the ship dives without heeling angle in the locked state on the surface, the preset overpressure protection pressure value of the inner cavity of the action mechanism 7 of each protection unit of the Y-direction protection subsystem is P=P0. Under the Y-direction deformation and extrusion of the hull structure 1, the inner cavity pressure of the action mechanism 7 exceeds the overpressure protection pressure P0, the hydraulic cylinder 2 overflows, and the floating raft vibration isolation device 12 is still in the Y-direction locking state; at this time, the bottom plate 9 in the plane sliding device of the action mechanism 7 is in rigid contact with the floating raft vibration isolation device 12, which can adapt to the relative displacement between the hull structure 1 and the floating raft vibration isolation device 12 in the X-direction and Z-direction;

[0039] b) Underwater locking state II: When the ship dives with a heel angle in the locked state on the surface, the preset overpressure protection pressure value P of the inner cavity of the action mechanism 7 installed in the port side protection unit of the hull structure 1 is P0+▽P1, recorded as P1; the preset overpressure protection pressure value P of the inner cavity of the action mechanism 7 of the starboard side protection unit of the hull structure 1 is P0+▽P2, recorded as P2; wherein, ▽P1 and ▽P2 are calculated according to the lateral additional force generated by the floating raft vibration isolation device 12 in the heel state; if the ship is in the left heel state, ▽P1 is a positive value ( The lateral component of the gravity used to balance the floating raft vibration isolation device 12 and the equipment thereon), ▽P2 is zero, otherwise ▽P2 is a positive value and ▽P1 is zero; ultimately, it is ensured that the Y-direction load of the floating raft vibration isolation device 12 can be balanced without the need for the lower shock absorber to provide an additional Y-direction straightening load, so that the floating raft vibration isolation device 12 is in a zero-position locking state; the bottom plate 9 in the plane sliding device of the action mechanism 7 is in rigid contact with the floating raft vibration isolation device 12, and can adapt to the relative displacement between the hull structure 1 and the floating raft vibration isolation device 12 in the X-direction and Z-direction;

[0040] c) Underwater limit: When the ship dives, the retraction displacement of the action mechanism 7 is determined by introducing the diving depth signal and the displacement signal measured by the displacement sensor 6. When the lateral deformation of the hull structure 1 is greater than 0.2 mm, the action mechanism 7 retreats to the specified position in the hydraulic cylinder 2 to adapt to the Y-direction deformation of the hull structure 1 caused by the diving depth. After the retreat is completed, the oil inlet 4 and the oil outlet 5 of the hydraulic cylinder 2 are closed; on the contrary, when floating, the action mechanism 7 extends from the hydraulic cylinder 2 to a set length;

[0041] d) Underwater locking state I or underwater locking state II is switched to underwater limit: the action mechanism 7 is retracted from the locking state, and the retraction amount is determined according to the diving depth signal and the displacement signal measured by the displacement sensor 6; the ship continues to dive / surface, and when the Y-direction deformation of the hull structure 1 is greater than 0.2mm, the action mechanism 7 is retracted / extended relative to the hydraulic cylinder 2. After the action is completed, the oil inlet 4 and the oil outlet 5 of the hydraulic cylinder 2 are closed to adapt to the Y-direction deformation of the hull structure 1 caused by the diving depth;

[0042] e) The underwater limit state is switched to the underwater locking state I: the action mechanism 7 arranged in the protection unit on the left and right sides of the ship's hull structure 1 extends outward to the top of the floating raft vibration isolation device 12, and maintains a certain pressure P0. The constant pressure P0 is maintained during the buoyancy / diving process to adapt to the Y-direction deformation of the hull structure 1 caused by the diving depth, and a constant clamping force is maintained on the floating raft vibration isolation device 12;

[0043] f) Underwater limit state switches to underwater locking state II: The actuating mechanism 7 in the protection unit arranged on the left and right sides of the ship hull structure 1 extends out and presses against the floating raft vibration isolation device 12. The preset overpressure protection pressure value in the inner cavity of the actuating mechanism 7 in the left-side protection unit is P1, and the preset overpressure protection pressure value in the inner cavity of the actuating mechanism 7 in the right-side protection unit is P2. If the roll angle remains unchanged, P1 and P2 are kept constant during the ascent / descent process; if the roll angle changes, the values of P1 and P2 are adjusted.

[0044] Through the above strategies, each protection unit of the Y-direction protection subsystem can adapt to the three-direction deformation of the ship hull structure 1 caused by the diving depth, and lock or limit the floating raft vibration isolation device 12 to achieve the safety protection of the floating raft vibration isolation device in the Y direction.

[0045] The working principles of the X-direction protection subsystem and the Z-direction protection subsystem are similar to those of the Y-direction protection subsystem.

[0046] Under the joint control of the X-direction protection subsystem, the Y-direction protection subsystem and the Z-direction protection subsystem, it can be ensured that the entire system can freely switch between the two safety protection working states of locking or limiting, and can adapt to the additional loads caused by the hull swaying and tilting and the hull deformation caused by the diving depth.

[0047] Furthermore, this safety protection system can not only be used in cooperation with the floating raft vibration isolation device, but also be used in cooperation with large-scale units with elastic installation.

[0048] In summary, the above is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A safety protection system for a ship vibration isolation device, characterized in that, The safety protection system includes: a central controller, an X-direction protection subsystem, a Y-direction protection subsystem, and a Z-direction protection subsystem that are connected to the central controller; the X-direction protection subsystem, the Y-direction protection subsystem, and the Z-direction protection subsystem are respectively installed on the bulkhead of the hull structure (1), and respectively correspond to the X-direction, Y-direction, and Z-direction of the ship vibration isolation device; the X-direction protection subsystem can limit or lock and protect the X-direction tilt displacement of the ship vibration isolation device, the Y-direction protection subsystem can limit or lock and protect the Y-direction tilt displacement of the ship vibration isolation device, and the Z-direction protection subsystem can limit and lock and protect the Z-direction tilt displacement of the ship vibration isolation device; The ship vibration isolation device adopts a floating raft vibration isolation device (12); the four protection units in each protection subsystem have the same structure, and each protection unit includes: a hydraulic cylinder (2), a displacement sensor (6), an actuating mechanism (7), and a planar sliding device; the hydraulic cylinder (2) is installed on the bulkhead of the hull structure (1), one end of the actuating mechanism (7) is installed in the hydraulic cylinder (2), and the other end faces the floating raft vibration isolation device (12), and a planar sliding device is connected to the end of this end. The displacement sensor (6) is arranged on the end face of the hydraulic cylinder (2) opposite to the floating raft vibration isolation device (12) for detecting the tilt displacement of the floating raft vibration isolation device (12) relative to the hull structure (1) in a set direction and transmitting it to the central controller; when the tilt displacement is greater than the set value, the central controller controls the hydraulic cylinder (2) to drive the actuating mechanism (7) to extend, so that the planar sliding device at the end of the actuating mechanism (7) contacts or presses the floating raft vibration isolation device (12), thereby limiting or locking its set direction; The planar sliding device includes: a base (8), a bottom plate (9), and a positioning spring (11). The base (8) is installed at the end of the actuating mechanism (7), and a groove is provided on the side facing the floating raft vibration isolation device (12). The two sides of the bottom plate (9) are supported in the groove of the base (8) by the positioning spring (11) on the two opposite inner side walls, one end is slidably matched with the inner bottom surface of the groove of the base (8) through more than two spherical structures, and the other end faces the floating raft vibration isolation device (12).

2. The safety protection system for a ship vibration isolation device according to claim 1, characterized in that, The X-direction protection subsystem, the Y-direction protection subsystem, and the Z-direction protection subsystem have the same structure, each including four protection units. The four protection units in the X-direction protection subsystem are respectively arranged on the left and right sides of the bow and stern of the hull structure (1) in the X-direction, the four protection units in the Y-direction protection subsystem are respectively arranged on the left and right sides of the bow and stern of the hull structure (1) in the Y-direction, and the four protection units in the Z-direction protection subsystem are respectively arranged on the left and right sides of the bow and stern of the hull structure (1) in the Z-direction.

3. The safety protection system for a ship vibration isolation device according to claim 1, characterized in that, Each protection unit further includes: a stop block (3); a stop block (3) is provided on the outer surface of the end of the actuating mechanism (7) extending into the hydraulic cylinder (2) for limiting the actuating mechanism (7) after it extends outward to a set position.

4. The safety protection system for a ship vibration isolation device according to claim 1, characterized in that, The planar sliding device is detachably connected to the end of the actuating mechanism (7).

5. The safety protection system for a ship vibration isolation device according to claim 1, characterized in that, The planar sliding device further includes: a buffer block (10) which is arranged at one end of the base (8) opposite to the floating raft vibration isolation device (12) and is used for buffering the contact between the base (8) and the floating raft vibration isolation device (12).

Images