Extremely-low-frequency composite rubber vibration isolator

Abstract

The utility model relates to an extremely low frequency composite rubber vibration isolator which comprises an upper cover plate, an upper metal barrel, a lower metal barrel, a rubber vibration isolation sleeve, a piston rod, a spring and a base plate, the upper cover plate is fixed at the upper end of the upper metal barrel, and the inner wall of the lower end of the upper metal barrel is connected with the outer wall of the upper end of the lower metal barrel through the rubber vibration isolation sleeve. The lower end of the lower metal barrel is fixedly connected with the base plate, a lower cover plate with a center through hole is fixed to the upper end of the lower metal barrel, the spring is located in the lower metal barrel, the lower end of the spring is fixedly connected with the upper surface of the base plate, and the lower end of the piston rod penetrates through the center through hole, then extends into the lower metal barrel and is fixedly connected with the upper end of the spring. The upper end of the piston rod is located between the upper cover plate and the lower cover plate. The composite vibration isolator has the advantages that the inherent frequency of the composite vibration isolator is low and is only about 2 Hz, so that the composite vibration isolator has a good low-frequency vibration isolation effect, and the composite vibration isolator is simple and stable in overall structure and convenient to install, maintain and use.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vibration isolators, in particular to an extremely low frequency composite rubber vibration isolator. BACKGROUND

[0002] Low frequency of the natural frequency of the vibration isolator is beneficial to improve the vibration isolation effect of the vibration isolator, and the vibration isolators selected for the vibration isolation of the existing ship mechanical equipment mainly include air bag vibration isolators and rubber vibration isolators. The natural frequency of the air bag vibration isolator is about 2-6 Hz, which belongs to an extremely low frequency vibration isolator. With a natural frequency of 4 Hz, the air bag vibration isolator can achieve about 70% vibration isolation efficiency for 5 Hz low frequency vibration, and is usually used for the vibration isolation of large cabin raft, floating raft and large mechanical equipment, and has good low frequency and full band vibration isolation effect. However, due to the load of the air bag vibration isolator usually exceeding 1 ton, and the limitations of high use cost, supporting gas supply and more control equipment, the air bag vibration isolator is not suitable for the vibration isolation of small and medium-sized mechanical equipment and vibration isolation devices.

[0003] For small and medium-sized mechanical equipment and vibration isolation devices with a total weight of hundreds of kilograms to several tons, rubber vibration isolators are usually selected for vibration isolation. However, due to the influence of the strain range, service life and creep of the elastomer material, the natural frequency of the rubber vibration isolator has reached the design limit of 6 Hz, and cannot be further reduced while ensuring the comprehensive performance. At present, for a large number of equipment with a total weight of hundreds of kilograms to several tons, the actual installation natural frequency of the vibration isolator selected for type selection is usually more than 6 Hz, and the vibration of 5 Hz or less cannot be isolated, but will be amplified. At present, there is no rubber vibration isolator with a natural frequency less than 2 Hz, a rated load less than 500 kg, good low frequency vibration isolation performance, high creep stability and full band vibration isolation effect for selection. CONTENT OF THE UTILITY MODEL

[0004] The utility model provides an extremely low frequency composite rubber vibration isolator, which aims at overcoming the above-mentioned deficiencies in the prior art.

[0005] The utility model discloses a kind of extremely low frequency composite rubber vibration isolators, it includes upper cover plate, upper metal cylinder, lower metal cylinder, rubber vibration isolation sleeve, piston rod, spring and base plate, the upper cover plate is fixed on the upper end of the upper metal cylinder, the lower end inner wall of the upper metal cylinder is connected with the upper end outer wall of the lower metal cylinder by the rubber vibration isolation sleeve, the lower end of the lower metal cylinder is fixedly connected with the base plate, the lower end of the lower metal cylinder is fixed with the lower cover plate with central through-hole, the spring is located in the lower metal cylinder, the lower end of the spring is fixedly connected with the upper surface of the base plate, the piston rod lower end passes through the central through-hole and then extends into the lower metal cylinder and is fixedly connected with the upper end of the spring, the upper end of the piston rod is located between the upper cover plate and lower cover plate, when the upper cover plate is pressed down, the upper metal cylinder pulls down the rubber vibration isolation sleeve to make the rubber vibration isolation sleeve gradually unfold and the upper cover plate is pressed down the upper end of the piston rod after descending a distance.

[0006] On the basis of the above technical scheme, the utility model can also be improved as follows.

[0007] Further, the upper end of the upper metal cylinder is provided with an outward turning edge, and the periphery of the upper cover plate is fixedly connected with the outward turning edge through bolts.

[0008] Further, a plurality of screw holes for connecting mechanical equipment are uniformly and spacedly formed on the upper cover plate and the outward turning edge, and a plurality of air holes are formed on the upper cover plate and communicate with the inside of the upper metal cylinder.

[0009] Further, a plurality of mounting holes for fixing the base plate to a floor or a platform are uniformly and spacedly formed on the outer periphery of the base plate.

[0010] Further, a damping cover plate is fixedly arranged on the upper surface of the lower cover plate, and a hole corresponding to the central through-hole is formed in the center of the damping cover plate.

[0011] Further, the damping cover plate is made of nitrile rubber and is fixedly connected with the top surface of the lower cover plate through vulcanization forming.

[0012] Further, the rubber vibration isolation sleeve is in the shape of a ring, the outer ring surface of the rubber vibration isolation sleeve is fixedly connected with the lower end inner wall of the upper metal cylinder through vulcanization forming, the inner ring surface of the rubber vibration isolation sleeve is fixedly connected with the upper end outer wall of the lower metal cylinder through vulcanization forming, and the S-shaped reciprocating folding structure of the rubber vibration isolation sleeve is located between the outer ring surface and the inner ring surface.

[0013] Further, the upper end and the lower end of the piston rod are connected with limiting plates, and the rod segment between the two limiting plates is in clearance fit with the central through-hole.

[0014] Compared with the prior art, the utility model has the advantages of:

[0015] (1) the inherent frequency of the compound vibration isolator is low, only about 2Hz, when used for vibration isolation of ship and similar equipment, the low-frequency vibration of the ship equipment can be effectively isolated from the ship body, the comfort of the ship passengers is improved, and the service life of the ship equipment is effectively improved;

[0016] (2) the vibration isolation effect is good, and the structure is stable, the rubber vibration isolation sleeve in the compound vibration isolator adopts a low stiffness structure design, which provides a large deformation capacity for the vibration isolator, so that the vibration isolator has excellent vibration isolation effect; at the same time, the vertical spring bears part of the vertical load, and the radial rubber provides effective buffering for the lateral force, so that the vibration isolator has excellent vibration isolation effect and high lateral stability.

[0017] (3) the vibration isolator structure is simple, and installation, maintenance and use are convenient. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A cross-sectional view of the extremely low frequency composite rubber vibration isolator is provided.

[0019] Figure 2 For Figure 1 The top view of the extremely low frequency composite rubber vibration isolator is shown.

[0020] In the drawings, the component list represented by each reference number is as follows:

[0021] 1, upper cover plate; 2, upper metal cylinder; 3, lower metal cylinder; 4, rubber vibration isolation sleeve; 5, piston rod; 6, spring; 7, base plate; 8, lower cover plate; 9, damping cover plate; 10, limiting plate. DETAILED DESCRIPTION

[0022] The principles and characteristics of the utility model will be described below in combination with the drawings, and the examples are only used to explain the utility model, and are not used to limit the scope of the utility model.

[0023] In the description of the utility model, if the terms indicating the orientation such as "up", "down", "left", "right", "top", "bottom", "inside", "outside" are used, the indicated orientation or position relationship is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as limiting the device or element indicated to have a specific orientation, to be constructed and operated in a specific orientation, therefore, it cannot be understood as limiting the utility model.

[0024] For example, Figure 1 And 2As shown, the utility model provides a kind of very low frequency composite rubber vibration isolator, it includes upper cover plate 1, upper metal cylinder 2, lower metal cylinder 3, rubber vibration isolation sleeve 4, piston rod 5, spring 6 and base plate 7, the upper cover plate 1 is fixed in the upper end of the upper metal cylinder 2, the lower end inner wall of the upper metal cylinder 2 is connected with the upper end outer wall of the lower metal cylinder 3 by the rubber vibration isolation sleeve 4, the lower end of the lower metal cylinder 3 is fixedly connected with the base plate 7, the lower end of the lower metal cylinder 3 is fixed with the lower cover plate 8 with central through hole, the spring 6 is located in the lower metal cylinder 3, the lower end of the spring 6 is fixedly connected with the upper surface of the base plate 7, the lower end of the piston rod 5 is inserted into the lower metal cylinder 3 after passing through the central through hole and is fixedly connected with the upper end of the spring 6, the upper end of the piston rod 5 is located between the upper cover plate 1 and lower cover plate 8, when the upper cover plate 1 is pressed down, the upper metal cylinder 2 pulls down the rubber vibration isolation sleeve 4 to make the rubber vibration isolation sleeve 4 gradually unfold and the upper cover plate 1 is pressed to the upper end of the piston rod 5 after descending a distance.

[0025] It should be noted that the lower metal cylinder upper end and lower cover plate can be fixedly connected together by screw, or directly set matching thread structure to realize detachable thread connection; spring is fixedly connected with piston rod and lower base plate by screw; spring is located in the center of the composite vibration isolator (i.e. the center of lower metal cylinder), for supporting part rated load.

[0026] In an embodiment of the utility model, the upper end of the upper metal cylinder 2 is equipped with an outward flange, and the periphery of the upper cover plate 1 is fixedly connected with the outward flange by a bolt.

[0027] In an embodiment of the utility model, a plurality of screw holes for connecting mechanical equipment are evenly and spacedly provided on the upper cover plate 1 and the outward flange, and a plurality of air holes are provided on the upper cover plate 1 and communicate with the inside of the upper metal cylinder 2.

[0028] It can be understood that the air holes can be provided on the cylinder wall of the upper metal cylinder or other positions that can effectively communicate with the external atmospheric pressure and do not produce adverse friction effect on the rubber vibration isolation sleeve.

[0029] In an embodiment of the utility model, a plurality of mounting holes for fixing the base plate 7 to the floor or platform are evenly and spacedly provided on the outer periphery of the base plate 7.

[0030] It should be noted that the floor and platform referred to herein refer to a plate-shaped structure for fixing at the original installation position of the equipment to be isolated, such as the bottom plate of a ship equipment warehouse, etc. When the composite rubber vibration isolator is applied to ship equipment vibration isolation, the lower connecting seat plate and the ship body base are fixedly connected together by screws, and the upper cover plate and the equipment in the ship are fixedly connected together by screws.

[0031] In an embodiment of the present application, the upper surface of the lower cover plate 8 is fixedly provided with a damping cover plate 9, and the center of the damping cover plate 9 is provided with a hole corresponding to the center through hole.

[0032] In an embodiment of the present application, the damping cover plate 9 is made of nitrile rubber and is fixedly connected with the top surface of the lower cover plate 8 through vulcanization forming.

[0033] It should be noted that the nitrile rubber used in the damping cover plate of the present application preferably has a hardness of 80 shore A.

[0034] In an embodiment of the present application, the rubber vibration isolation sleeve 4 is in the form of a ring sleeve as a whole, the outer ring surface of the rubber vibration isolation sleeve 4 is fixedly connected with the inner wall of the lower end of the upper metal cylinder 2 through vulcanization forming, the inner ring surface of the rubber vibration isolation sleeve 4 is fixedly connected with the outer wall of the upper end of the lower metal cylinder 3 through vulcanization forming, and the rubber vibration isolation sleeve 4 in the form of an S-shaped reciprocating folding structure is located between the outer ring surface and the inner ring surface.

[0035] It should be noted that, as shown in Figure 1 and 2 The rubber vibration isolation sleeve, the upper metal cylinder and the lower metal cylinder are directly connected together through vulcanization forming, and the connection is firm and stable. The rubber vibration isolation sleeve is preferably made of a rubber material with a low dynamic-static stiffness ratio through a multi-S structure design, and has high stability, large deformation and low stiffness characteristics, which is used to support the main rated load. For example, the rubber material can be mixed by 1,5-nadiisocyanate and polyhydroxy acrylate in a weight ratio of 100:75-82, and cross-linked and cured into a multi-layer network elastomer at 120 DEG C for 60 minutes, which has excellent mechanical properties and elasticity, and the rubber body dynamic-static stiffness ratio is 1.1.

[0036] In an embodiment of the present application, the upper end and the lower end of the piston rod 5 are connected with limiting plates 10, and the rod section of the piston rod 5 located between the two limiting plates 10 is in clearance fit with the center through hole.

[0037] The basic working principle of the composite rubber vibration isolator is that: the equipment generating vibration is fixed above the vibration isolator (connected with the upper cover plate), the rubber vibration isolation sleeve on the vibration isolator is deformed downwards (the S-shaped reciprocating folding structure is gradually unfolded) under the load, and the upper cover plate contacts the metal piston body to compress the spring, at this time, the spring and the rubber vibration isolation sleeve jointly bear the equipment weight, large bearing capacity and large deformation capacity can be realized, and thus low inherent frequency is realized; the dynamic and static stiffness of the rubber vibration isolation sleeve is relatively small, generally about 1.1, which is reduced by more than 40% compared with the dynamic and static stiffness ratio (greater than 1.8) of commonly used rubber bodies, and the inherent frequency of the vibration isolator is effectively reduced.

[0038] The above merely describes the preferred embodiments of the present utility model, and is not used to limit the present utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. An extremely low frequency composite rubber isolator characterized by, The utility model relates to a piston rod type shock absorber, including upper cover plate (1), upper metal cylinder (2), lower metal cylinder (3), rubber vibration isolation sleeve (4), piston rod (5), spring (6) and base plate (7), upper cover plate (1) is fixed in the upper end of upper metal cylinder (2), the inner wall of the lower end of upper metal cylinder (2) is connected with the outer wall of the upper end of lower metal cylinder (3) through rubber vibration isolation sleeve (4), the lower end of lower metal cylinder (3) is fixedly connected with base plate (7), the lower end of lower metal cylinder (3) is fixed with lower cover plate (8) with central through -hole, spring (6) is located in lower metal cylinder (3), the lower end of spring (6) is fixedly connected with the upper surface of base plate (7), the lower end of piston rod (5) is inserted into lower metal cylinder (3) after passing through central through -hole and is fixedly connected with the upper end of spring (6), the upper end of piston rod (5) is located between upper cover plate (1) and lower cover plate (8), when upper cover plate (1) is pressed and goes down, upper metal cylinder (2) pulls down rubber vibration isolation sleeve (4) and makes rubber vibration isolation sleeve (4) gradually unfold and the upper end of piston rod (5) is pressed tightly after upper cover plate (1) goes down a distance.

2. The very low frequency compound rubber isolator according to claim 1, characterized in that, The upper end of the upper metal cylinder (2) is provided with an outward flange, and the periphery of the upper cover plate (1) is fixedly connected with the outward flange through bolts.

3. The very low frequency compound rubber isolator according to claim 2, wherein, A plurality of screw holes for connecting mechanical equipment are uniformly and correspondingly arranged on the upper cover plate (1) and the outward flange, and a plurality of air holes are arranged on the upper cover plate (1) and communicate with the inside of the upper metal cylinder (2).

4. The very low frequency compound rubber isolator according to claim 1, wherein A plurality of mounting holes for fixing the base plate (7) to the floor or platform are uniformly and correspondingly arranged on the outer periphery of the base plate (7).

5. The very low frequency compound rubber isolator according to claim 1, wherein A damping cover plate (9) is fixedly arranged on the upper surface of the lower cover plate (8), and a hole corresponding to the central through-hole is arranged in the center of the damping cover plate (9).

6. The very low frequency compound rubber isolator according to claim 5, wherein The damping cover plate (9) is made of nitrile rubber and is fixedly connected with the top surface of the lower cover plate (8) through vulcanization forming.

7. The very low frequency compound rubber isolator of claim 1, wherein The rubber vibration isolation sleeve (4) is in the shape of a ring, the outer ring surface of the rubber vibration isolation sleeve (4) is fixedly connected with the inner wall of the lower end of the upper metal cylinder (2) through vulcanization forming, the inner ring surface of the rubber vibration isolation sleeve (4) is fixedly connected with the outer wall of the upper end of the lower metal cylinder (3) through vulcanization forming, and the S-shaped reciprocating folding structure of the rubber vibration isolation sleeve (4) is located between the outer ring surface and the inner ring surface.

8. An extremely low frequency compound rubber vibration isolator according to any one of claims 1 to 7, characterized in that, The upper end and the lower end of the piston rod (5) are connected with limiting plates (10), and the rod segment between the two limiting plates (10) is matched with the gap of the central through-hole.

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