Hemispherical metal rubber vibration isolator structure and working and manufacturing method thereof

Abstract

The application relates to a hemispherical metal rubber vibration isolator structure, which comprises a damping shell, a damping rod vertically penetrating the damping shell and axially reciprocating, and metal rubber arranged between the damping rod and the damping shell, wherein the metal rubber is formed by mutually connecting an upper hemispherical metal rubber and a lower hemispherical metal rubber into a spherical shape, the upper hemispherical metal rubber is connected with the damping rod, and the lower hemispherical metal rubber is connected with the damping shell. Through self deformation of the hemispherical shape and the characteristics of the metal rubber, lower rigidity or even negative rigidity can be realized, so that the vibration isolation frequency band is widened. The vibration isolator can not only attenuate vertical vibration impact, but also can withstand certain horizontal vibration impact. A bolt is arranged at the upper end of the vibration isolator, so that the equipment needing vibration reduction can be fixed on the upper end of the vibration isolator; and the lower end of the vibration isolator is tightly fixed on a base through the bolt on the lower end cover. When subjected to external vibration, the vibration isolator can realize the vibration reduction effect through longitudinal vibration.

Description

TECHNICAL FIELD

[0001] The application relates to a semi-spherical metal-rubber vibration isolator structure and a working and manufacturing method thereof, and belongs to the technical field of vibration reduction. BACKGROUND

[0002] With the development of the economic society, mechanical vibration and noise have been a restricting factor for the development of high-tech mechanical equipment. Especially under special environmental conditions, high-tech equipment faces more severe tests. Therefore, the damping and buffering damping material needs to have strong environmental adaptability, including high / low temperature resistance, corrosion resistance, non-volatility in a vacuum environment, and non-influence by space radiation. At present, the conventional damping and buffering damping material mainly adopts high polymer rubber and its synthetic products. However, due to the use environment limitation and short service life, the material cannot maintain the persistent stiffness and damping performance in a special environment, and needs to be regularly maintained and replaced, thereby increasing the maintenance cost and period of the equipment.

[0003] The metal rubber is an elastic porous metal material prepared by spirally winding and orderly arranging constant-pitch fine metal wires in a mold through a cold stamping process. The microstructure of the metal rubber is similar to that of the high polymer rubber material, and is formed by the mutual connection of the metal wire spirals. Macroscopically, the metal rubber is formed by the orderly winding and stacking of the metal wires, and exhibits the elastic and damping performance similar to that of rubber. The material not only has the characteristics of high elasticity and variable damping, but also can adapt to high and low temperature environments and resist aging, and therefore is an ideal material suitable for harsh environments.

[0004] In the wide application of the vibration isolator, especially in the fields of aviation and aerospace and cutting-edge military, the demand for new high-elasticity and large-damping materials is increasing. The special application requirements in the field of aviation and aerospace require the vibration isolator to have a wider vibration isolation frequency band, and put forward more stringent requirements on the stiffness characteristics of the metal rubber. The traditional metal rubber vibration isolator commonly adopts ring-shaped, column-shaped, square-shaped and the like, and cannot meet the requirements of negative stiffness in some application scenarios. In order to overcome the low-frequency vibration reduction limit, the application provides a semi-spherical metal rubber vibration isolator, which aims to weaken the vibration characteristics of the equipment in the working condition or transportation. SUMMARY

[0005] In view of the deficiencies of the prior art, the technical problem to be solved by the application is to provide a semi-spherical metal rubber vibration isolator structure and a working and manufacturing method thereof.

[0006] In order to solve the above technical problems, the technical scheme of the application is as follows: a semi-spherical metal rubber vibration isolator structure, comprising a vibration reduction shell, an axially reciprocating vibration reduction rod vertically penetrating the vibration reduction shell, and a metal rubber arranged between the vibration reduction rod and the vibration reduction shell. The metal rubber is formed by mutually connecting an upper semi-spherical metal rubber and a lower semi-spherical metal rubber into a spherical shape, wherein the upper semi-spherical metal rubber is fixedly connected with the vibration reduction rod, and the lower semi-spherical metal rubber is fixedly connected with the vibration reduction shell.

[0007] Preferably, the damping shell comprises an outer shell, an upper end cover fixed on the top of the outer shell, a lower end cover fixed on the bottom of the outer shell, a base fixed on the inside of the outer shell above the lower end cover, a limiting sleeve fixed on the base, and a damping rod sequentially penetrating the upper end cover, the outer shell, the limiting sleeve, and the base from top to bottom.

[0008] Preferably, the through hole in the middle top of the upper hemispherical metal rubber penetrates a stepped shaft on the damping rod, and an arc-shaped gasket is sleeved between the outer surface of the middle top of the upper hemispherical metal rubber and the stepped shaft, the arc-shaped gasket being in contact with the outer surface of the middle top of the upper hemispherical metal rubber, and the inner surface of the middle top of the upper hemispherical metal rubber being locked by a locking nut screwed on the stepped shaft, the top of the locking nut being in contact with the inner surface of the middle top of the upper hemispherical metal rubber.

[0009] Preferably, the upper hemispherical metal rubber and the lower hemispherical metal rubber are integrally connected by an inner connecting ring and an outer connecting ring, the inner connecting ring being located inside the metal rubber, the outer connecting ring being located outside the metal rubber, the outer periphery of the inner connecting ring being in contact with the inner periphery wall of the joint between the upper and lower hemispherical metal rubbers, the inner periphery of the outer connecting ring being in contact with the outer periphery wall of the joint between the upper and lower hemispherical metal rubbers, the upper and lower hemispherical metal rubbers and the inner and outer connecting rings being integrally locked by bolts, and the outer periphery of the outer connecting ring being in sliding fit with the inner periphery wall of the outer shell in the vertical direction.

[0010] Preferably, an axially vertical upper annular metal rubber is fixed on the inner periphery of the inner connecting ring, and the damping rod coaxially penetrates the inner periphery of the upper annular metal rubber; a fastening nut is screwed on the bottom end of the damping rod, and a lower annular metal rubber is sleeved on the damping rod between the fastening nut and the base.

[0011] Preferably, the middle bottom of the lower hemispherical metal rubber is clamped between the limiting sleeve and the base, the through hole in the base has an internal thread, the bottom of the limiting sleeve has an external screw post, the external screw post penetrates the through hole in the middle bottom of the lower hemispherical metal rubber and is screwed on the internal thread, the contact surfaces of the limiting sleeve and the base with the lower hemispherical metal rubber are arc-shaped surfaces in contact with each other, and the limiting sleeve and the base are made of aluminum alloy.

[0012] The working method of the semi-spherical metal rubber vibration isolator structure is carried out in the following steps: when the vibration isolator is subjected to external force, the force is transmitted to the upper and lower semi-spherical metal rubbers through the damping rod, at this time, the upper and lower semi-spherical metal rubbers are mainly stressed at the top of the upper semi-spherical metal rubber due to the locking of the inner and outer connecting rings, the main damping element is the semi-spherical metal rubber, when the semi-spherical metal rubber moves downward slowly, the upper circular ring metal rubber with large density and high rigidity plays a role to avoid deformation of the semi-spherical metal rubber caused by excessive impact load; at the same time, in order to effectively cope with the rebound impact that may be generated after the vibration stops, the lower circular ring metal rubber has good deformation rebound characteristics and plays a rebound limiting role, effectively preventing the rebound of the damping rod from being excessive.

[0013] The manufacturing method of the semi-spherical metal rubber vibration isolator structure is carried out in the following steps: first, a metal wire is selected and wound into a dense spiral coil by using a special winding machine; second, a winding mandrel with a certain taper is prepared, and the dense spiral coil formed in the first step is wound on the winding mandrel to form a metal rubber blank; third, the blank is formed by stamping using a stamping die.

[0014] Preferably, the stamping die comprises a die base, a concave die is arranged at the top of the die base, the die cavity of the concave die is in a semi-spherical shape, a core shaft is arranged inside the concave die, the core shaft comprises a vertical lower core shaft, the bottom of the lower core shaft is arranged through a vertical through hole on the concave die and the base, and the top end of the lower core shaft is coaxially and fixedly provided with an upper core shaft with an outer diameter larger than that of the lower core shaft, the bottom of the upper core shaft is also in a semi-spherical shape, and a forming space for the semi-spherical metal rubber is formed between the die cavity of the concave die and the bottom of the upper core shaft; a pressing sleeve is arranged on the outer periphery of the upper core shaft, and an outer sleeve is arranged on the outer periphery of the pressing sleeve.

[0015] Preferably, the outer sleeve and the pressing sleeve are in a hollow cylindrical shape, the outer diameter of the pressing sleeve is smaller than the inner diameter of the outer sleeve, and the inner diameter of the pressing sleeve is larger than the outer diameter of the upper core shaft, so as to avoid size interference between the pressing sleeve and the core shaft during the pressing forming process of the metal rubber component.

[0016] Compared with the prior art, the present application has the following beneficial effects:

[0017] The present application relates to a semi-spherical metal rubber vibration isolator, which can achieve lower rigidity or even negative rigidity by combining the self-deformation of the semi-spherical shape with the characteristics of the metal rubber, thereby expanding the vibration isolation frequency band. The vibration isolator not only can attenuate vertical vibration impact, but also can withstand certain horizontal vibration impact. The upper end of the vibration isolator is designed with a bolt, which can firmly fix the equipment that needs to be damped on the upper end of the vibration isolator, and the lower end of the vibration isolator is tightly fixed on the base through the bolt on the lower end cover. When subjected to external vibration, the vibration isolator can achieve damping effect through longitudinal vibration.

[0018] The application will be further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The figure is a schematic view of the structure of the embodiment of the application.

[0020] Figure 2 The figure is a schematic view of the structure of the embodiment of the application. Figure 1 The figure is a schematic view of the structure of the embodiment of the application.

[0021] Figure 3 The figure is a schematic view of the structure of the embodiment of the application. Figure 1 The figure is a schematic view of the structure of the embodiment of the application.

[0022] Figure 4 The figure is a schematic view of the structure of the embodiment of the application. Figure 1 The figure is a schematic view of the structure of the embodiment of the application.

[0023] Figure 5 The figure is a schematic view of the structure of the embodiment of the application. Figure 1 The figure is a schematic view of the structure of the embodiment of the application.

[0024] Figure 6 The figure is a schematic view of the structure of the embodiment of the application.

[0025] Figure 7 The figure is a schematic view of the structure of the embodiment of the application. Figure 1 .

[0026] Figure 8 The figure is a schematic view of the structure of the embodiment of the application. Figure 2 .

[0027] Figure 9 The figure is a schematic view of the structure of the embodiment of the application. Figure 3 .

[0028] Figure 10 The figure is a schematic view of the structure of the embodiment of the application. DETAILED DESCRIPTION

[0029] The application will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0030] It should be noted that the following detailed description is exemplary and is intended to provide further description of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0031] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0032] As shown in Figures 1-10 The present embodiment provides a semi-spherical metal rubber vibration isolator structure, comprising a damping shell 1, an axially reciprocating damping rod 2 vertically penetrating the damping shell, a metal rubber provided between the damping rod and the damping shell, the metal rubber being formed into a spherical shape by an upper semi-spherical metal rubber 3 and a lower semi-spherical metal rubber 4 being fixed to each other, wherein the upper semi-spherical metal rubber is fixed to the damping rod, and the lower semi-spherical metal rubber is fixed to the damping shell.

[0033] In the embodiment of the present application, the damping shell comprises an outer shell 5, an upper end cover 6 fixed to the top of the outer shell, a lower end cover 7 fixed to the bottom of the outer shell, a base 8 fixed to the inside of the outer shell above the lower end cover, a limiting sleeve 9 fixed to the top of the base, and the damping rod sequentially penetrating the through holes of the upper end cover, the outer shell, the limiting sleeve and the base from top to bottom, and the bottom end of the damping rod being above the lower end cover.

[0034] In the embodiment of the present application, the through hole in the middle top of the upper semi-spherical metal rubber penetrates a stepped shaft on the damping rod, and an arc-shaped gasket 10 is sleeved between the outer surface of the middle top of the upper semi-spherical metal rubber and the stepped shaft, the arc-shaped gasket being in contact with the outer surface of the middle top of the upper semi-spherical metal rubber, and the inner surface of the middle top of the upper semi-spherical metal rubber being locked by a locking nut 11 screwed on the stepped shaft, the top of the locking nut being in contact with the inner surface of the middle top of the upper semi-spherical metal rubber.

[0035] In the embodiment of the present application, the upper semi-spherical metal rubber and the lower semi-spherical metal rubber are fixed to each other by an inner connecting ring 12 and an outer connecting ring 13, the inner connecting ring being inside the metal rubber, the outer connecting ring being outside the metal rubber, the outer periphery of the inner connecting ring being in contact with the inner periphery wall of the joint between the upper semi-spherical metal rubber and the lower semi-spherical metal rubber, the inner periphery of the outer connecting ring being in contact with the outer periphery wall of the joint between the upper semi-spherical metal rubber and the lower semi-spherical metal rubber, the upper semi-spherical metal rubber and the lower semi-spherical metal rubber being fixed to each other by bolts, and the outer periphery of the outer connecting ring being in sliding contact with the inner periphery wall of the outer shell in the vertical direction. This ensures that the damping rod has room for horizontal displacement when subjected to vertical excitation, and enables the semi-spherical metal rubber material to fully play a role in vibration isolation.

[0036] In the embodiment of the present application, the inner circumferential surface of the inner connecting ring is fixed with an axially vertical upper circular ring metal rubber 14, and the damping rod coaxially passes through the inner circumferential surface of the upper circular ring metal rubber; the bottom end of the damping rod is screwed with a fastening nut 15, and the damping rod between the fastening nut and the base is sleeved with a lower circular ring metal rubber 16.

[0037] In the embodiment of the present application, the middle bottom of the lower hemispherical metal rubber is clamped between the limiting sleeve and the base, the through hole on the base is provided with an internal thread, the bottom of the limiting sleeve is provided with an external screw column, the external screw column passes through the through hole of the middle bottom of the lower hemispherical metal rubber and is screwed on the internal thread, the contact surfaces of the limiting sleeve and the base with the lower hemispherical metal rubber are arc surfaces that are matched with each other, and the limiting sleeve and the base are made of high-strength aluminum alloy. The mass of the vibration isolator is reduced under the condition of ensuring the strength of the vibration isolator.

[0038] A working method of the structure of the hemispherical metal rubber vibration isolator is performed in the following steps: when the vibration isolator is subjected to external force, the force is transmitted to the upper and lower hemispherical metal rubbers via the damping rod, at this time, the upper and lower hemispherical metal rubbers are mainly stressed at the top of the upper hemispherical metal rubber due to the locking of the inner and outer connecting rings, the main damping element is the hemispherical metal rubber, when the hemispherical metal rubber slowly moves downward, the upper circular ring metal rubber with large density and high rigidity plays a role to avoid deformation of the hemispherical metal rubber caused by excessive impact load, and at the same time, in order to effectively cope with the rebound impact that may be generated after vibration stops, the lower circular ring metal rubber has good deformation and rebound characteristics and plays a role of rebound limiting to effectively prevent excessive rebound of the damping rod.

[0039] A manufacturing method of the structure of the hemispherical metal rubber vibration isolator is performed in the following steps:

[0040] Firstly, a metal wire is selected and wound into a dense spiral coil by using a special wire winding machine.

[0041] In this step, firstly, a metal wire is selected and wound into a dense spiral coil by using a special wire winding machine. According to the technical index requirements of the prepared hemispherical metal rubber component, the material and diameter of the metal wire are selected, and the diameter ranges from 0.1 mm to 0.4 mm. The metal wire is wound into a dense spiral coil by using a special wire winding machine, and the diameter of the spiral coil is controlled to be 5 to 15 times of the diameter of the metal wire to ensure that the spiral coil turns in the hemispherical metal rubber component are well hooked.

[0042] Secondly, a winding mandrel with a certain taper is prepared, and the dense spiral coil formed in the first step is wound on the winding mandrel to form a metal rubber blank.

[0043] The metal rubber blank is prepared by using a numerical control full-automatic metal rubber blank winding device or is wound manually; the winding mandrel is designed with a certain taper (1-5°) to facilitate the removal of the metal rubber blank from the winding mandrel.

[0044] The winding blank has two methods: using a numerical control full-automatic metal rubber blank winding device, performing constant-pitch stretching on the tight-turn metal wire spiral (the pitch after stretching is equal to the diameter of the spiral), and winding the constant-pitch stretched spiral on the mandrel of the mold according to the set trajectory to form the metal rubber blank.

[0045] In the third step, the blank is punched and formed by using a punching die.

[0046] The metal rubber blank, the formed punching die, and the forming auxiliary tooling are installed on the workbench of the hydraulic machine.

[0047] The metal rubber blank is placed between the concave die and the pressing block, the mandrel passes through the concave die and the middle part of the die base for positioning, and the closed cavity formed by the pressing block, the mandrel, the outer sleeve, and the concave die is the forming cavity of the metal rubber.

[0048] In the fourth step, the die is ejected.

[0049] The half-spherical metal rubber component after punching and forming is ejected by the ejection auxiliary part to ensure that the component can be easily separated from the die.

[0050] In the fifth step, the formed hollow circular table-shaped metal rubber component is trimmed and cleaned to remove burrs and dirt on the surface and ensure that the surface of the component is smooth and clean.

[0051] Finally, the formed hollow circular table-shaped metal rubber component is trimmed and cleaned to remove burrs and dirt on the surface and ensure that the surface of the component is smooth and clean.

[0052] In the embodiment of the present application, the punching die comprises a die base 17, the top of the die base is provided with a concave die 18, the die cavity of the concave die is in the shape of a hemisphere, the inside of the concave die is provided with a mandrel, the mandrel comprises a vertical lower mandrel 19, the bottom of the lower mandrel is arranged through a vertical through hole on the concave die and the die base, the top end of the lower mandrel is coaxially and fixedly provided with an upper mandrel 20 with an outer diameter larger than that of the lower mandrel, the bottom of the upper mandrel is also in the shape of a hemisphere and surrounds a forming space 21 of the half-spherical metal rubber with the die cavity of the concave die, the outer periphery of the upper mandrel is sleeved with a pressing sleeve 22, the outer periphery of the pressing sleeve is sleeved with an outer sleeve 23, and the bottom of the pressing sleeve is provided with a pressing block 24.

[0053] In the embodiment of the present application, the outer sleeve and the pressing sleeve are in the shape of a hollow cylinder, the outer diameter of the pressing sleeve is smaller than the inner diameter of the outer sleeve, and the inner diameter of the pressing sleeve is larger than the outer diameter of the upper mandrel, so as to avoid size interference between the pressing sleeve and the mandrel during the pressing and forming process of the metal rubber component.

[0054] In the embodiment of the present application, the static mechanical property test is carried out on the hemispherical metal rubber test element, and the test result is as shown in Figures 7-9 The hemispherical metal rubber element can realize variable stiffness and even negative stiffness effect through self deformation.

[0055] In the embodiment of the present application, the random vibration experiment is carried out on the hemispherical metal rubber vibration isolator, and five different RMS target values are set, and the random vibration response curve is as shown in Figure 10 It can be known through comparison that under the condition of the same counterweight, the increase of RMS makes the natural frequency of the vibration isolator system have a slight decreasing trend, and the response peak value at the resonance frequency presents a gradually increasing trend, and the first-order natural frequency of the system is close to the sine sweep result, the natural frequency of the system is stable at about 18-20Hz, and the damping efficiency increases with the increase of input RMS, and the damping efficiency of the five different RMS systems is 52.79%, 55.96%, 58.17%, 59.7% and 61.78% respectively, which means that the system has good damping potential under high vibration condition.

[0056] The present application relates to a hemispherical metal rubber vibration isolator, which can realize lower stiffness and even negative stiffness through self deformation of the hemispherical shape and the characteristics of metal rubber, so as to expand the vibration isolation frequency band. The vibration isolator can not only attenuate vertical vibration impact, but also withstand certain horizontal vibration impact. The upper end of the vibration isolator is designed with a bolt, which can firmly fix the equipment to be damped on the upper end of the damping rod of the vibration isolator, and the lower end of the vibration isolator is tightly fixed on the base through the bolt on the lower end cover. When subjected to external vibration, the vibration isolator can realize damping effect through longitudinal vibration.

[0057] The hemispherical metal rubber vibration isolator of the present application fully utilizes the characteristics of the porous damping element and impact resistance element of metal rubber, and is suitable for damping and buffering of aerospace precision equipment under low frequency to ultralow frequency, has the advantages of high and low temperature resistance, non-volatility, corrosion resistance and long fatigue life, and can improve the damping performance of the equipment.

[0058] The present application breaks through the limitations of the previous vibration isolator in stability performance, structural characteristics and impact resistance. The hemispherical metal rubber is used as a damping element, so that the vibration isolator can overcome the problem of low frequency damping limit of the metal rubber vibration isolator in the long-term use, thereby significantly expanding the vibration isolation frequency band.

[0059] The unique feature of the present application is that the vibration isolator utilizes the shape change characteristics of metal rubber, so that the stiffness of the vibration isolator can be adjusted under external load. This design not only makes the structure simple and the cost relatively low, but also is suitable for various harsh environments.

[0060] The hemispherical metal rubber shock absorber is widely applicable to aerospace, ships, precision instruments and equipment and the like. The cylindrical symmetric structure endows the shock absorber with three-way damping function, so that the shock absorber can better adapt to various environmental conditions. Overall, the application has the remarkable characteristics of wide application and long service life, and provides an excellent damping solution for various fields.

[0061] The above description is only the preferred embodiment of the present application, and is not intended to limit the present application in other forms. Any person skilled in the art can modify or change the above disclosed technical content into equivalent embodiments with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiments without departing from the technical solution of the present application, and in accordance with the technical essence of the present application, still belongs to the protection scope of the technical solution of the present application.

Claims

1. A hemispherical metal-rubber vibration isolator structure, characterized by: The application relates to a damping shell, which is vertically penetrated by a damping rod axially reciprocating, and is provided with metal rubber between the damping rod and the damping shell, wherein the metal rubber is formed by mutually fixed upper half-spherical metal rubber and lower half-spherical metal rubber into a spherical shape, the upper half-spherical metal rubber is fixed with the damping rod, and the lower half-spherical metal rubber is fixed with the damping shell; the damping shell comprises an outer shell, an upper end cover fixed at the top of the outer shell, a lower end cover fixed at the bottom of the outer shell, a base fixed above the outer shell and above the lower end cover, and a limiting sleeve fixed above the base; the damping rod passes through the through holes of the upper end cover, the outer shell, the limiting sleeve and the base in sequence from top to bottom, and the bottom end of the damping rod is located above the lower end cover; the through hole in the middle top of the upper half-spherical metal rubber passes through a stepped shaft on the damping rod, an arc-shaped gasket is arranged between the outer surface of the middle top of the upper half-spherical metal rubber and the stepped shaft, the arc-shaped gasket is attached to the outer surface of the middle top of the upper half-spherical metal rubber, the inner surface of the middle top of the upper half-spherical metal rubber is locked by a locking nut screwed on the stepped shaft, and the top of the locking nut is attached to the inner surface of the middle top of the upper half-spherical metal rubber; the upper half-spherical metal rubber and the lower half-spherical metal rubber are fixed into an integrated whole by an inner connecting ring and an outer connecting ring, the inner connecting ring is located in the metal rubber, the outer connecting ring is located outside the metal rubber, the outer ring of the inner connecting ring is attached to the inner circumferential wall of the joint of the upper half-spherical metal rubber and the lower half-spherical metal rubber, the inner ring of the outer connecting ring is attached to the outer circumferential wall of the joint of the upper half-spherical metal rubber and the lower half-spherical metal rubber, the upper half-spherical metal rubber and the lower half-spherical metal rubber are locked into an integrated whole by a bolt, and the outer ring of the outer connecting ring is slidably matched with the inner circumferential wall of the outer shell in the vertical direction; an axially vertical upper circular ring metal rubber is fixed on the inner ring of the inner connecting ring, and the damping rod coaxially passes through the inner ring of the upper circular ring metal rubber; a fastening nut is screwed on the bottom end of the damping rod, and a lower circular ring metal rubber is arranged on the damping rod between the fastening nut and the base; the middle bottom of the lower half-spherical metal rubber is clamped between the limiting sleeve and the base, the through hole of the base is provided with an internal thread, the bottom of the limiting sleeve is provided with an external screw column, the external screw column passes through the through hole of the middle bottom of the lower half-spherical metal rubber and is screwed on the internal thread, the contact surfaces of the limiting sleeve and the base with the lower half-spherical metal rubber are arc-shaped surfaces attached to each other, and the limiting sleeve and the base are made of aluminum alloy.

2. A method of operating a semi-spherical metal rubber isolator structure as claimed in claim 1, characterized in that, When the vibration isolator is subjected to external force, the force is transmitted to the upper and lower hemispherical metal rubbers via the damping rod, at this time, the upper and lower hemispherical metal rubbers are mainly stressed at the top of the upper hemispherical metal rubber due to the locking of the inner and outer connecting rings, the main damping element is the hemispherical metal rubber, when the hemispherical metal rubber moves downward slowly, the upper circular metal rubber with large density and high rigidity plays a role when the load impact is too large, so as to avoid deformation of the hemispherical metal rubber caused by excessive impact; at the same time, in order to effectively cope with the rebound impact that may be generated after the vibration stops, the lower circular metal rubber has good deformation rebound characteristics and plays a rebound limiting role, effectively preventing the rebound of the damping rod from being excessive.

3. A method of manufacturing the semi-spherical metal rubber isolator structure according to claim 1, characterized by, The following steps are performed: first, select a metal wire, and use a special winding machine to wind it into a dense spiral coil; second, prepare a winding mandrel with a certain taper, and wind the dense spiral coil formed in the first step on the winding mandrel to form a metal rubber blank; third, use a stamping die to stamp and form the blank.

4. The manufacturing method of the semi-spherical metal rubber isolator structure according to claim 3, characterized in that: The stamping die comprises a die base, a concave die is arranged at the top of the die base, the die cavity of the concave die is in a hemispherical shape, a core shaft is arranged inside the concave die, the core shaft comprises a vertical lower core shaft, the lower core shaft is arranged through a vertical through hole on the concave die and the base, an upper core shaft with an outer diameter larger than that of the lower core shaft is coaxially arranged at the top end of the lower core shaft, the bottom of the upper core shaft is also in a hemispherical shape, and a forming space for the hemispherical metal rubber is formed between the die cavity of the concave die and the bottom of the upper core shaft.

5. The manufacturing method of the semi-spherical metal rubber isolator structure according to claim 4, characterized in that: The outer sleeve and the pressing sleeve are in a hollow cylindrical shape, the outer diameter of the pressing sleeve is smaller than the inner diameter of the outer sleeve, and the inner diameter of the pressing sleeve is larger than the outer diameter of the upper core shaft, so as to avoid size interference between the pressing sleeve and the core shaft during the pressing forming process of the metal rubber member.

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