Line spectrum vibration isolation type vibration isolator

Abstract

The invention discloses a line spectrum vibration isolation type vibration isolator which comprises a mounting base. The shell is mounted on the mounting base, and the upper and lower ends of the shell are open; the vibration isolation inner core is arranged in the shell and comprises a plurality of elastic layers which are vertically distributed and local resonance layers located between every two adjacent elastic layers, and the elastic layers and the local resonance layers are stacked in the shell; and the bearing platform is in a step shape and is placed on the vibration isolation inner core, the small-diameter section extends out of the opening in the upper end face of the shell and is used for providing a mounting surface for the vibration isolator and equipment to be subjected to vibration isolation, and the diameter of the large-diameter section is larger than that of the opening in the upper end face of the shell. According to the vibration isolator, through staggered stacking of the elastic layers and the local resonance layers, the small longitudinal rigidity of the vibration isolator is guaranteed, and the situation that the stability is reduced due to the fact that the elastic layers are too thick is avoided; the elasticity of the elastic layer and the elasticity of the local resonance layer are utilized to generate a local resonance effect, local resonance of a specific frequency is generated, and then elastic wave transmission in a specific frequency range is blocked.

Description

Technical Field

[0001] The invention relates to the technical field of vibration reduction and vibration isolation, and in particular to a line spectrum vibration isolation type vibration isolator. Background Art

[0002] The operation of equipment will inevitably cause vibration, which will lead to safety hazards such as structural fatigue and fracture, which is unacceptable in survival activities, especially in nuclear power plant safety-related equipment. For equipment, vibration isolators are important vibration reduction components that suppress the transmission of vibration along the path. They are widely used in structures such as ships, railways, buildings, and nuclear power plants, and can effectively improve the vibration and noise suppression performance of the structure.

[0003] The current rubber vibration isolator technology has the following difficulties: First, the low-frequency performance (10-315Hz) of the vibration isolator is insufficient. Due to the high damping of rubber materials, rubber vibration isolators can achieve good vibration isolation effects in the high-frequency band, but the medium-frequency resonance and low-frequency performance of internal components need to be further strengthened; Second, in order to reduce the vibration isolation frequency, it is usually necessary to reduce the stiffness of the vibration isolator, but too low stiffness will lead to a decrease in the impact resistance of the equipment, which is not conducive to equipment safety under extreme loads such as earthquakes.

[0004] To this end, the present application introduces a local resonance structure belonging to the acoustic metamaterial structure in the vibration isolator. Through the periodic arrangement of specially designed artificial acoustic microstructure units, extraordinary physical properties that natural materials do not have are obtained. The local resonance structure is used to achieve extraordinary control of elastic waves, which can block the propagation of vibration waves in a small size to solve the above-mentioned problems. Summary of the invention

[0005] The main purpose of the present invention is to provide a line spectrum vibration isolation type vibration isolator which improves the medium and low frequency performance of the vibration isolator while maintaining a certain rigidity.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solution: a line spectrum vibration isolation type isolator, comprising:

[0007] Install the base;

[0008] A shell is mounted on the mounting base, and the upper and lower ends of the shell are open to provide an internal space to accommodate the main components of the vibration isolator and provide a rigid boundary and a limit;

[0009] The vibration isolation core is arranged inside the shell, and includes a plurality of elastic layers distributed vertically and a local resonance layer located between two adjacent elastic layers, wherein the elastic layers and the local resonance layer are stacked inside the shell;

[0010] The bearing platform is in the shape of a step, with a large diameter section located inside the shell and placed on the vibration isolation inner core, and a small diameter section extending from an opening on the upper end face of the shell to provide a mounting surface for the vibration isolator and the vibration isolated equipment, and the diameter of the large diameter section is larger than the opening on the upper end face of the shell.

[0011] Furthermore, the local resonance layer includes a mounting base and a counterweight block, the mounting base is through-connected in the middle, and the counterweight block is located in the middle of the through-connected mounting base.

[0012] Furthermore, the local resonance layer further comprises an elastomer, wherein the elastomer is located between the mounting base and the counterweight block and is used for suspending the counterweight block in the middle of the mounting base.

[0013] Furthermore, the middle part of the elastic layer is arranged to penetrate the position of the counterweight block, so that a collision can occur between the upper and lower counterweight blocks.

[0014] Furthermore, it also includes a rigid frame and a radial elastic unit arranged in the outer shell, wherein the rigid frame (6) is sleeved on the outside of the vibration isolation inner core; and the radial elastic unit is sleeved on the outside of the rigid frame and is located between the rigid frame and the inner wall of the outer shell.

[0015] Furthermore, the elastic layer and the radial elastic unit are made of metal rubber.

[0016] Furthermore, the elastomer is a thin metal layer with elasticity.

[0017] Furthermore, the elastic body is a plurality of elastic metal connecting beams evenly distributed in the mounting base.

[0018] Furthermore, mounting holes are formed through corresponding positions of the housing and the mounting base, for mounting the vibration isolator on a corresponding foundation.

[0019] Furthermore, a method for testing the vibration isolation effect of a vibration isolator is provided, the method being implemented based on the above-mentioned line spectrum vibration isolation type vibration isolator, wherein the testing device is composed of a foundation, a vibration isolator, a pump body, a sensor, a data acquisition system and a computer system;

[0020] The method comprises: S1, installing the lower end of the vibration isolator on the foundation, and installing the pump body on the upper end of the vibration isolator through machine feet;

[0021] S2, installing the sensor on the foundation near the lower end of the sensor and on the machine foot near the upper end of the sensor respectively;

[0022] S3, starting the data acquisition system and the computer system to collect background vibration data;

[0023] S4, turning on the power of the pump body equipment, waiting for the pump equipment to be in the set operating condition to start collecting vibration data within the first time, and the computer system is connected to the data acquisition system to store and process the vibration data;

[0024] S5. Replace the vibration isolator and repeat steps S1-S4.

[0025] The beneficial effects of the present invention are embodied in:

[0026] 1. The present invention ensures a smaller longitudinal stiffness of the isolator and prevents the elastic layer from being too thick, which would lead to a decrease in stability, by staggered stacking of the elastic layer and the local resonance layer. The elasticity of the elastic layer and the local resonance layer itself are used to generate a local resonance effect, thereby generating a local resonance of a specific frequency, thereby blocking the transmission of elastic waves within a specific frequency range.

[0027] 2. Multiple metal rubber layers provide stiffness for the isolator and have a gradual hardening feature to ensure the impact resistance of the isolator. The local resonance layer contains a local resonance structure composed of an elastomer and a counterweight block, which produces a local resonance of a specific frequency. The counterweight block is installed in the inner space between the metal rubber layer and the local resonance layer. Adjacent counterweight blocks collide with each other under impact loads, thereby improving the impact resistance of the isolator.

[0028] 3. All main materials of the vibration isolator are made of metal materials, which makes the vibration isolator have good radiation resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A half-section view of the line spectrum vibration isolation type vibration isolator of the present invention;

[0030] Figure 2 is a structural view of the local resonance layer in Embodiment 1 of the present invention;

[0031] Figure 3 In: Figure (a) is a schematic diagram of the connection structure of the elastic layer and the local resonance layer in Example 2 of the present invention, and Figure (b) is a schematic diagram of the specific structure of the local resonance layer in Example 2;

[0032] Figure 4 In the figure: (a) is a horizontal plane view of the local resonance layer in the second embodiment of the present invention, (b) is a vertical plane view of the local resonance layer in the second embodiment of the present invention;

[0033] Figure 5 In the figure: (a) is the first-order vibration mode of the counterweight block in the second embodiment in the vibration z transmission direction, (b) is the first-order vibration mode of the counterweight block in the second embodiment in the vibration z direction;

[0034] Figure 6is the vibration mode displacement cloud diagram of the end of the connecting beam in Example 2;

[0035] Figure 7 Middle: (a) shows the simulated value, predicted value and corrected value of the frequency at the lower boundary of the band gap; (b) shows the simulated value, predicted value and corrected value of the frequency at the upper boundary of the band gap;

[0036] Figure 8 is a schematic diagram of the test device in Example 2;

[0037] Fig. 9 This is a structural view of the local resonance layer in Embodiment 3 of the present invention.

[0038] Explanation of the numbers in the figures:

[0039] 1. Elastic layer; 2. Local resonance layer; 2-1. Counterweight; 2-2. Elastomer; 2-3. Mounting base; 3. Load-bearing platform; 4. Shell; 5. Mounting base; 6. Rigid skeleton; 7. Radial elastic unit; 8. Mounting hole. DETAILED DESCRIPTION

[0040] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0042] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0044] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other.

[0045] See also Figure 1-Figure 9 .

[0046] Embodiment 1:

[0047] The present invention discloses a line spectrum vibration isolation type vibration isolator, comprising: a mounting base 5; a shell 4, mounted on the mounting base 5, the upper and lower ends of the shell 4 are open, and are used to provide an internal space to accommodate the main components of the vibration isolator, and provide a rigid boundary and a limit; a vibration isolation core, arranged inside the shell 4, comprising a plurality of vertically distributed elastic layers 1 and a local resonance layer 2 located between two adjacent elastic layers 1, the elastic layer 1 and the local resonance layer 2 are stacked in the shell 4; the local resonance layer 2 comprises a mounting base 2-3, a counterweight block 2-1 and an elastic The elastic body 2-2 is located between the mounting base 2-3 and the counterweight 2-1, and is used to suspend the counterweight 2-1 in the middle of the mounting base 2-3; the bearing platform 3 is in the shape of a step, the large diameter section is located inside the outer shell 4 and is placed on the vibration isolation inner core, and the small diameter section extends from the opening on the upper end face of the outer shell 4, and is used to provide a mounting surface for the vibration isolator and the vibration-isolated equipment, and the diameter of the large diameter section is larger than the opening on the upper end face of the outer shell 4.

[0048] The present invention ensures a smaller longitudinal stiffness of the vibration isolator by staggered stacking of the elastic layer 1 and the local resonance layer 2, and prevents the elastic layer 1 from being too thick, which would result in reduced stability. The elasticity of the elastic layer 1 and the elasticity of the local resonance layer 2 are used to generate a local resonance effect. The main functions of the counterweight 2-1 and the elastic body 2-2 are to generate a local resonance of a specific frequency, thereby blocking the transmission of elastic waves within a specific frequency range. The counterweight 2-1 is preferably made of a metal or non-metal material with a relatively high density, and constitutes the mass part of the local resonance structure.

[0049] It should be noted that the elastic layer 1 and the local resonance layer 2 are annular, the mounting base 2-3 is a hard base, the mounting base 2-3 is a hollow ring, and the outer shell 4 is cylindrical, but the above components can also be selected into other shapes according to actual needs.

[0050] In one embodiment, the middle portion of the elastic layer 1 is provided with a through-hole at a position corresponding to the counterweight block 2 - 1 , so that a collision can occur between the upper and lower counterweight blocks 2 - 1 .

[0051] In a specific implementation, the elastic layer 1 is in the shape of a hollow ring, and the distance between the two adjacent upper and lower counterweight blocks 2-1 should not be too large, preferably about several millimeters, preferably 2-5 millimeters; the purpose is that when a larger impact load occurs, the adjacent counterweight blocks 2-1 collide and dissipate, further improving the impact resistance of the vibration isolator.

[0052] In one embodiment, it also includes a rigid frame 6 and a radial elastic unit 7 arranged in the outer shell 4. The rigid frame 6 is sleeved on the outside of the vibration isolation core; the radial elastic unit 7 is sleeved on the outside of the rigid frame 6 and is located between the rigid frame 6 and the inner wall of the outer shell 4.

[0053] In specific implementation, the main function of the rigid skeleton 6 is to provide sufficient radial rigidity to the vibration isolation core, to compensate for the insufficient shear resistance of the elastic layer 1, and to avoid excessive deformation; the radial elastic unit 7 is mainly used to improve the radial vibration reduction performance of the vibration isolator.

[0054] In one embodiment, the elastic layer 1 and the radial elastic unit 7 are metal rubber. With this design, on the one hand, the elastic layers 1 supported by the metal rubber provide the rigidity of the vibration isolator and have a gradual hardening feature, thereby ensuring the impact resistance of the vibration isolator; on the other hand, the use of the metal rubber can improve the radiation resistance of the equipment, making it less likely to fail, so that the vibration isolator can be used in the nuclear island environment with a longer service life.

[0055] In one embodiment, the elastomer 2 - 2 is a thin metal layer with elasticity.

[0056] In a specific implementation, the elastic body 2-2 can be made of any elastic metal material, preferably 304 steel. In this way, all the main materials of the vibration isolator are made of metal materials, so that the vibration isolator has good radiation resistance and can be used in the nuclear island environment with a long service life.

[0057] In one embodiment, mounting holes 8 are formed at corresponding positions of the housing 4 and the mounting base 5, for mounting the vibration isolator on a corresponding foundation. In a specific implementation, bolts are passed through the mounting holes 8, and then nuts on the bolts are tightened to fix the vibration isolator on the corresponding foundation; wherein the bolts may be pre-buried in the corresponding foundation, or may be connected to the foundation later.

[0058] Embodiment 2:

[0059] The difference between this embodiment and the first embodiment is that the elastic body 2-2 is a plurality of elastic metal connecting beams evenly distributed in the mounting base 2-3. The elastic body 2-2 can be made of any elastic metal material, preferably, 304 steel material is selected.

[0060] In order to further illustrate the vibration isolation effect of the vibration isolator provided by the present invention, it is described below in conjunction with specific preferred embodiments.

[0061] In view of the shape parameter requirements of existing vibration isolators in the LDH engineering environment, this section proposes a local resonance layer 2 made of 304 steel. The local resonance layer 2 consists of an outer ring mounting base 2-3, a counterweight block 2-1 in the center, and a connecting beam (i.e., an elastic body 2-2). The three-dimensional diagram and periodic arrangement diagram of the local resonance layer 2 are shown in Figure 3 As shown, the plan view of a single local resonance layer 2 is as follows Figure 4 As shown:

[0062] exist Figure 4 The height and bottom radius of the cylindrical counterweight 2-1 are h and r respectively, and the height, inner radius and outer radius of the mounting base are H and R respectively. inne With R outer , the radius of the connecting beam (i.e. elastic body) is r b , let h=8mm, r=15mm, H=6mm, R inner With R outer are 35mm and 60mm respectively, and the radius of the connecting beam (i.e. elastic body) is r b 0.5mm,

[0063] The upper and lower boundary frequencies of the band gap of the local resonance layer are:

[0064]

[0065]

[0066] in:

[0067] k is the stiffness of the connecting beam (i.e. elastic body)

[0068] m 1 is the mass of the counterweight m 1 =πr 2 hρ;

[0069] m 2 The quality of the mounting base

[0070] ρ is the material density of 304 steel;

[0071] E is the elastic modulus of 304 steel;

[0072] I is the section moment of inertia of the connecting beam (i.e. the elastic body).

[0073] Substituting various parameters of the local resonance layer 2 into (1) and (2), it is calculated that the band gap of the local resonance layer 2 is about 189-199 Hz. Finite element dynamics simulation of the local resonance layer 2 is performed, as shown in FIG. Figure 5 As shown. Figure 5 (a) is the first-order vibration mode of the counterweight 2-1 in the vibration transmission direction, and the first-order natural frequency of the counterweight 2-1 in the vibration transmission direction is 171.83 Hz; Figure 5 (b) is the first-order vibration mode of the counterweight 2-1 and the mounting base 2-3 in the z direction in anti-phase vibration, and the corresponding frequency is 179.47 Hz.

[0074] Through simulation, it is found that the band gap of the local resonance layer 2 is 171.83~179.47Hz, which is quite different from the parameter calculated value of 189~199Hz. By observing the vibration mode displacement cloud diagram, it is found that there is a displacement perpendicular to the z direction at the end of the connecting beam, such as Figure 6 As shown, the calculated stiffness of the connecting beam is not accurate and needs to be corrected.

[0075] Change the radius r of the connecting beam b The predicted values ​​of the upper and lower boundary frequencies of the band gap are obtained by (1) and (2), and the simulated values ​​of the upper and lower boundaries of the band gap are obtained by finite element simulation, as shown in Table 1.

[0076] Table 1 Upper and lower boundaries of the band gap of the local resonance layer

[0077]

[0078]

[0079] It is not difficult to find from Table 1 that as the radius of the connecting beam r b The ratio of the predicted value of the upper and lower boundary frequencies of the band gap to the simulated value also increases linearly. Linear regression analysis is performed on the ratio of the predicted value of the upper and lower boundary frequencies of the band gap to the calculated value, and the correction formula for the upper and lower boundary frequencies of the band gap of the local resonance layer is obtained:

[0080]

[0081] Among them, f 1 '、f 2 ' are the correction values ​​of the upper and lower frequency boundaries of the band gap, For r b The dimensionless quantity of

[0082] Substitute the parameters of the local resonance layer into equations (1), (2), (3), and (4), and change the radius of the connecting beam r b , and the correction values ​​of the upper and lower boundaries of the band gap are obtained. Figure 7 In the figure: (a) shows the simulation value, predicted value and corrected value of the frequency of the lower boundary of the band gap; (b) shows the simulation value, predicted value and corrected value of the frequency of the upper boundary of the band gap; it can be seen that the corrected upper and lower boundary frequencies of the band gap are basically consistent with the simulation results, indicating that the correction formula improves the accuracy of the calculation method of the band gap frequency of the local resonance unit.

[0083] Test of vibration isolation effect test of vibration isolator:

[0084] The test device diagram is as follows: Figure 8 As shown: the test device is mainly composed of a foundation, a vibration isolator, a pump body, a sensor, a data acquisition system and a computer system. Among them, the lower end of the vibration isolator is installed on the foundation, the pump body is installed on the upper end of the vibration isolator through the machine foot, and the sensor is installed on the foundation near the lower end of the sensor and the machine foot near the upper end of the sensor. The sensor collects vibration data to the data acquisition system through a connecting line, and the computer system is connected to the data acquisition system to store and process the vibration data.

[0085] In a feasible implementation, the test of the vibration isolation effect test of the vibration isolator includes the following steps: S1. Install the vibration isolator between the pump body and the foundation according to the test system position to ensure that the installation is stable and determine that the test environment is within the working environment allowed by the sensor and the connecting cable specification; S2. Use adhesives or bolts to install the sensors on the pump equipment feet and foundation close to the vibration isolator to ensure that impurities such as oil, paint, and dirt will not affect the measurement; S3. Turn on the data acquisition system and the computer system to collect background vibration data; S4. Turn on the power of the pump equipment and wait until the pump equipment is in rated operating conditions to start collecting vibration data; S5. Replace the vibration isolator and repeat steps S1-S4; S6. After the test is completed, dismantle the test device, check the test device and test instruments, clean the test equipment, and ensure that all equipment is stored in good condition.

[0086] In this embodiment, after the acceleration time curve at the measuring point is obtained by using the acceleration sensor in this test, the acceleration frequency curve at the measuring point, ie, the acceleration spectrum, can be obtained directly by using the computer system using the fast Fourier transform.

[0087] The vibration acceleration level La is usually used to evaluate the vibration magnitude at a specific frequency. The vibration acceleration level La is calculated as follows:

[0088] Wherein, a is the acceleration value at a specific frequency, aref is the reference acceleration and aref=1E-6m / s2.

[0089] In this embodiment, when analyzing the acceleration spectrum, 1 / 3 octave is usually used for analysis. An octave represents a geometric interval of two adjacent frequencies in a 2n-fold relationship. Therefore, for a 1 / 3 octave, the upper and lower boundaries are: u =2 1 / 3 f l (6): where fu is the upper frequency limit and fl is the lower frequency limit.

[0090] The evaluation of the vibration magnitude in each octave band usually uses the root mean square value of the spectrum curve in the band. The calculation formula is: Wherein, rms is the root mean square value of the spectrum curve in the frequency band, Lai is the acceleration value of the sampling point in the frequency band, and n is the number of sampling points in the frequency band.

[0091] In the vibration isolation effect test of the vibration isolator, the vibration level drop is defined as the difference between the vibration acceleration level at the upper measuring point and the vibration acceleration level at the lower measuring point.

[0092] The acceleration level drop (VLD) of the low frequency band (10-315 Hz), high frequency band (315-8000 Hz), and full frequency band (10-8000 Hz) of each measuring point at the upper and lower ends of the four vibration isolators are calculated respectively. The calculation results are shown in Table 2. (a), (b), (c), and (d) are vibration isolators located at four positions (four measuring points) of the pump body respectively;

[0093] Table 2 Acceleration level difference of various types of vibration isolators

[0094]

[0095]

[0096] In order to verify the line spectrum control effect of the metamaterial isolator, the vibration level drop within the band gap frequency range of the metamaterial isolator was calculated and cross-compared. When processing the data, it was found that the 50Hz electromagnetic interference had a greater impact on the vibration isolation effect of the 50Hz isolator. Therefore, this paper only cross-validated the line spectrum control effects of the 150Hz isolator and the 240Hz isolator. The vibration level drop results of the 150Hz isolator and the 240Hz isolator at 150Hz and 240Hz frequencies are shown in Table 3.

[0097] Table 3. Vibration level difference at specific frequencies of metamaterial isolators

[0098]

[0099]

[0100] The data show that the low-frequency performance of the line spectrum vibration isolation type isolator of the present application is significantly higher than that of the prototype vibration isolator.

[0101] Embodiment three:

[0102] The difference between this embodiment and the first embodiment is that, in order to further obtain a lower vibration reduction frequency, the elastic body 2-2 is a zigzag beam evenly distributed in the mounting base 2-3. The elastic body 2-2 can be made of any elastic metal material, preferably, 304 steel material is selected.

[0103] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

[0104] It should be noted that if the embodiments of the present invention involve directional indications (such as up and down), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0105] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0106] In addition, "plurality" means two or more.

Claims

1. A line spectrum vibration isolation type isolator, characterized in that: include: Mounting base (5); A housing (4) is mounted on the mounting base (5); the upper and lower ends of the housing (4) are open, and are used to provide an internal space for accommodating the main components of the vibration isolator, and to provide a rigid boundary and a limit position; The vibration-isolating inner core is arranged inside the outer shell (4), and comprises a plurality of elastic layers (1) distributed vertically and a local resonance layer (2) located between two adjacent elastic layers (1), wherein the elastic layers (1) and the local resonance layer (2) are stacked inside the outer shell (4); The bearing platform (3) is in the shape of a step, with a large diameter section located inside the outer shell (4) and placed on the vibration isolation inner core, and a small diameter section extending from an opening on the upper end face of the outer shell (4) to provide a mounting surface for the vibration isolator and the vibration isolated equipment, and the diameter of the large diameter section is larger than the opening on the upper end face of the outer shell (4).

2. The line spectrum vibration isolation type isolator according to claim 1, characterized in that: The local resonance layer (2) comprises a mounting base (2-3) and a counterweight block (2-1); the mounting base (2-3) is penetrated in the middle, and the counterweight block (2-1) is located in the middle of the penetration of the mounting base (2-3).

3. The line spectrum vibration isolation type isolator according to claim 2, characterized in that: The local resonance layer (2) further comprises an elastic body (2-2), wherein the elastic body (2-2) is located between the mounting base (2-3) and the counterweight block (2-1) and is used for suspending the counterweight block (2-1) in the middle of the mounting base (2-3).

4. The line spectrum vibration isolation type isolator according to claim 3, characterized in that: The middle part of the elastic layer (1) is arranged to penetrate the position of the counterweight block (2-1), so that a collision can occur between the upper and lower counterweight blocks (2-1).

5. The line spectrum vibration isolation type isolator according to any one of claims 1 to 4, characterized in that: It also comprises a rigid frame (6) and a radial elastic unit (7) arranged in the outer shell (4); the rigid frame (6) is sleeved on the outside of the vibration isolation inner core; the radial elastic unit (7) is sleeved on the outside of the rigid frame (6) and is located between the rigid frame (6) and the inner wall of the outer shell (4).

6. The line spectrum vibration isolation type isolator according to claim 5, characterized in that: The elastic layer (1) and the radial elastic unit (7) are made of metal rubber.

7. The line spectrum vibration isolation type isolator according to claim 2, 3 or 4, characterized in that: The elastic body (2-2) is a thin metal layer with elasticity.

8. The line spectrum vibration isolation type isolator according to claim 2, 3 or 4, characterized in that: The elastic body (2-2) is a plurality of elastic metal connecting beams evenly distributed in the installation base (2-3).

9. The line spectrum vibration isolation type isolator according to claim 1, 2 or 3, characterized in that: Mounting holes (8) are provided through corresponding positions of the housing (4) and the mounting base (5) for mounting the vibration isolator on a corresponding foundation.

10. A method for testing the vibration isolation effect of a vibration isolator, characterized in that: The method is implemented based on the line spectrum vibration isolation type isolator described in any one of claims 1 to 9 above, wherein the test device is composed of a foundation, a vibration isolator, a pump body, a sensor, a data acquisition system and a computer system; The method comprises: S1, installing the lower end of the vibration isolator on the foundation, and installing the pump body on the upper end of the vibration isolator through machine feet; S2, installing the sensor on the foundation near the lower end of the sensor and on the machine foot near the upper end of the sensor respectively; S3, starting the data acquisition system and the computer system to collect background vibration data; S4, turning on the power of the pump body equipment, waiting for the pump equipment to be in the set operating condition to start collecting vibration data within the first time, and the computer system is connected to the data acquisition system to store and process the vibration data; S5. Replace the vibration isolator and repeat steps S1-S4.

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