Contact type double-section rigidity limiter

Abstract

The invention relates to a contact type double-section rigidity limiting stopper which comprises an upper mounting plate, a shell, a pressing plate, a pulling plate, a middle connecting body, a bottom plate, a low-rigidity elastic body, a high-rigidity elastic body and a transverse elastic body, the pressing plate is arranged in the shell, the middle connecting body and the pulling plate are arranged in the middle, the high-rigidity elastic body is arranged between the pressing plate and the pulling plate and fixedly connected with the pulling plate, and the transverse elastic body is fixedly connected with the bottom plate. A low-rigidity elastomer is arranged between the high-rigidity elastomer and the middle connector, a transverse elastomer is arranged between the pull plate and the inner wall of the shell, the upper end of the middle connector is fixedly connected with an upper mounting plate, and the lower end of the shell is fixedly connected with a bottom plate. The limiting stopper is of a contact type structure and is convenient to install, and the problem that the contact type limiting stopper needs to accurately control the limiting gap does not exist; the low-rigidity elastic body can guarantee low rigidity in the vertical direction and the transverse direction, the high-rigidity elastic body is adjustable in shape and material hardness, and the requirement for the limiting rigidity of the ship cabin raft in the inclining, swinging and impacting states can be met.

Description

Technical Field

[0001] The invention relates to a vibration noise control technology, in particular to a limiter which can be used for displacement control of a ship cabin raft. Background Art

[0002] With the large-scale use of low-frequency rubber isolators, the displacement control of ship rafts has become an important link in the process of ship design and manufacturing, which directly affects the stability, safety and comfort of the ship. The traditional method of raft displacement control mainly relies on rigid limiters, but this method has some defects. For example, the rigidity of the rigid limiter is difficult to adjust, which easily leads to inaccurate control of raft displacement, thus affecting the stability and comfort of the ship. In recent years, some limiters made of elastic materials have also been used, but they mainly adopt a single stiffness design. This design has a large stiffness at small displacements, resulting in excessive impact force and affecting the service life of the equipment; and at large displacements, the stiffness may be insufficient, and the displacement of the raft cannot be effectively controlled, thereby failing to effectively reduce vibration and noise.

[0003] Chinese patent CN220134506U discloses a variable stiffness non-contact limiter for ships. The limiter involved in this patent can also achieve variable stiffness. The limiter is a non-contact structure. The non-contact structure will not affect the vibration isolation effect of the vibration isolator in the system within a certain displacement range. However, the installation of the limiter is more complicated and it is more difficult to achieve the centering of the vibration isolator to meet the limit gap to meet the design requirements. Therefore, it is not as convenient as a contact vibration isolator in installation.

[0004] Chinese patent CN109322966A discloses a three-way limiter for vibration isolation and limiting, which forms a contact-type variable stiffness three-way limiter through a spring combination. The limiter is complex in design and heavy in weight, which makes it difficult to meet the lightweight design requirements of modern ships. The springs are prone to fatigue damage under long-term vibration and load, which may cause material performance degradation or failure. Metal materials have a large thermal expansion coefficient, which may cause structural deformation or stress concentration in an environment with large temperature changes. The springs may generate noise when vibrating during long-term use, affecting the concealment of the ship. In terms of structural design, the use of spring combinations is not as flexible as non-metallic materials. Non-metallic materials can be processed into various complex shapes to meet different stiffness index requirements. The processing process uses mold forming, which is low in cost and reliable in performance.

[0005] In view of the shortcomings of rigid limiters and elastic limiters with single stiffness, it is necessary to design a contact-type double-stage stiffness limiter to solve related problems. The limiter also has the following capabilities: First, the two stiffness sections of the limiter are low stiffness section and high stiffness section. The low stiffness section has very low stiffness and has little effect on the frequency of the system; the high stiffness section has a particularly large stiffness, which can ensure that the equipment and pipelines can work normally when subjected to a huge impact, and control the displacement within an effective range; second, the structure is simple, the design is reasonable, and it is easy to manufacture and install; third, it has high strength and high reliability. The limiter is not easily affected by environmental factors in a complex marine environment, has a long service life, can withstand long-term vibration and impact, and reduces the frequency of maintenance and replacement; fourth, the limiter can discharge the incoming liquid to ensure normal function. Summary of the invention

[0006] The problem to be solved by the present invention is to provide a contact type double-stage stiffness limiter for controlling the displacement of a ship's raft, which can solve the problem that the raft produces a large displacement when impacted, causing damage to the isolator and the connecting pipeline, and protect the normal operation of the isolator and the connecting pipeline.

[0007] In order to achieve the above-mentioned purpose of the invention, the present invention is implemented by the following technical solutions:

[0008] A contact type double-stage stiffness limiter comprises an upper mounting plate, a shell, a pressure plate, a pull plate, an intermediate connector, a bottom plate, a low stiffness elastomer, a high stiffness elastomer and a transverse elastic body. A pressure plate is arranged in the shell, an intermediate connector is arranged in the middle, a pull plate, a high stiffness elastomer is arranged between the pressure plate and the pull plate, the high stiffness elastomer is fixedly connected to the pull plate, a low stiffness elastomer is arranged between the high stiffness elastomer and the intermediate connector, a transverse elastic body is arranged between the pull plate and the inner wall of the shell, the upper end of the intermediate connector is fixedly connected to the upper mounting plate, and the lower end of the shell is fixedly connected to the bottom plate.

[0009] Furthermore, a spring washer is provided between the intermediate connecting body and the mounting plate to prevent the intermediate connecting body from rotating in the upper mounting plate.

[0010] Furthermore, the high-rigidity elastic body is composed of a flat plate and a non-metallic material, and is fixed on the pull plate by a plurality of screws.

[0011] Furthermore, the high-rigidity elastomer structure is a ring-shaped structure, a fan-shaped structure, or a non-metallic material with a metal plate placed in the middle.

[0012] Furthermore, there is a gap between the intermediate connecting body and the pressing plate and the pulling plate to avoid a short circuit.

[0013] Furthermore, the bottom plate is a circular ring structure and does not contact the intermediate connector.

[0014] Further, both the low-rigidity elastic body and the lateral elastic body are freely placed in the housing.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The limiter of the present invention is a contact structure and is easy to install. There is no problem that the contact limiter requires precise control of the limit gap. The low-rigidity elastomer can ensure low rigidity in both the vertical and lateral directions. The high-rigidity elastomer has adjustable shape and material hardness, which can ensure the limit rigidity requirements of the ship's cabin raft under tilting, swaying and impact conditions.

[0017] The characteristics of the limiter are as follows: First, the two sections of the limiter are low stiffness section and high stiffness section. The low stiffness section has very low stiffness and has little effect on the frequency of the system; the high stiffness section has a particularly large stiffness, which can ensure that the equipment and pipelines can work normally when subjected to a huge impact, and control the displacement within an effective range; second, the structure is simple, the design is reasonable, and it is easy to manufacture and install; third, it has high strength and high reliability. The limiter is not easily affected by environmental factors in a complex marine environment, has a long service life, can withstand long-term vibration and impact, and reduces the frequency of maintenance and replacement; fourth, the limiter can discharge the incoming liquid to ensure normal function. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional view of the contact type double-stage stiffness limiter structure of the present invention;

[0019] Figure 2 for Figure 1 A top view of

[0020] Figure 3 This is a cross-sectional view of a circular structure of the high-rigidity elastomer in the present invention;

[0021] Figure 4 for Figure 3 A top view of

[0022] Figure 5 This is a cross-sectional view of the arc-shaped structure of the high-rigidity elastic body in the present invention;

[0023] Figure 6 for Figure 5 A top view of

[0024] In the figure, 1, mounting plate, 2, spring washer, 3, intermediate connector, 4, pressure plate, 5, low-rigidity elastomer, 6, high-rigidity elastomer, 7, screw, 8, lateral elastomer, 9, shell, 10, bottom plate, 11, pull plate, 21, non-metallic material, 22, flat plate. DETAILED DESCRIPTION

[0025] The following is a detailed description of an embodiment of the present invention in conjunction with the accompanying drawings. This embodiment is based on the technical solution of the present invention and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiment.

[0026] like Figures 1 to 6 As shown, the contact type double-stage stiffness limiter of the present invention includes an upper mounting plate 1, a spring washer 2, an intermediate connector 3, a pressure plate 4, a low stiffness elastomer 5, a high stiffness elastomer 6, a screw 7, a transverse elastomer 8, a shell 9, a bottom plate 10, and a pull plate 11.

[0027] The high-rigidity elastomer 6 is connected to the pull plate 11 through screws 7. The shell 9 is inverted, the pressure plate 4 is installed, and then the low-rigidity elastomer 5, the assembly of the high-rigidity elastomer 6 and the pull plate 11, and the transverse elastomer 8 are installed in sequence. The intermediate connector 3 is connected to the upper mounting plate 1 through threads, and a spring washer 2 is used in the middle to prevent the intermediate connector 3 from rotating in the upper mounting plate 1. Finally, the bottom plate 10 is connected to the shell 9 through threads.

[0028] The high-rigidity elastic body 6 is composed of a flat plate 22 and a non-metallic material 21. The high-rigidity elastic body 6 can be formed by vulcanization of the flat plate 22 and the non-metallic material 21 or by bonding with an adhesive, and its structure can be a ring structure (see Figure 3 , 4), or a fan-shaped structure (see Figure 5 ,6), a metal plate can also be placed in the middle of the non-metallic material, which can be designed according to the stiffness requirements.

[0029] There is a gap between the intermediate connector 3 and the pressing plate 4 and the pulling plate 11, which can avoid short circuit.

[0030] The bottom plate 10 is a circular ring structure to ensure that it does not contact the intermediate connector 3. At the same time, when liquid enters the stopper, the liquid can be discharged through this.

[0031] The low-rigidity elastic body 5 and the transverse elastic body 8 are freely placed in the limiter, and the high-rigidity elastic body 6 is fixed on the pull plate 11 by screws 7, and can be replaced when a unit component is damaged.

Claims

1. A contact type double-stage stiffness limiter, characterized in that: It includes an upper mounting plate, a shell, a pressure plate, a pull plate, an intermediate connector, a bottom plate, a low-rigidity elastomer, a high-rigidity elastomer, and a transverse elastomer. A pressure plate is provided in the shell, and an intermediate connector and a pull plate are provided in the middle. A high-rigidity elastomer is provided between the pressure plate and the pull plate, the high-rigidity elastomer is fixedly connected to the pull plate, a low-rigidity elastomer is provided between the high-rigidity elastomer and the intermediate connector, a transverse elastomer is provided between the pull plate and the inner wall of the shell, the upper end of the intermediate connector is fixedly connected to the upper mounting plate, and the lower end of the shell is fixedly connected to the bottom plate.

2. The contact type double-stage stiffness limiter according to claim 1, characterized in that: A spring washer is provided between the intermediate connecting body and the mounting plate to prevent the intermediate connecting body from rotating in the upper mounting plate.

3. The contact type double-stage stiffness limiter according to claim 1, characterized in that: The high-rigidity elastic body is composed of a flat plate and a non-metallic material and is fixed on the pull plate by a plurality of screws.

4. The contact type double-stage stiffness limiter according to claim 1, characterized in that: The high-rigidity elastomer structure is a ring-shaped structure, a fan-shaped structure, or a metal plate placed in the middle of a non-metallic material.

5. The contact type double-stage stiffness limiter according to claim 1, characterized in that: There is a gap between the intermediate connecting body and the pressing plate and the pulling plate for avoiding a short circuit.

6. The contact type double-stage stiffness limiter according to claim 1, characterized in that: The bottom plate is a circular ring structure and does not contact the middle connector.

7. The contact type double-stage stiffness limiter according to claim 1, characterized in that: The low-rigidity elastic body and the lateral elastic body are both freely placed in the shell.

Images