Roller-based nonlinear floating slab vibration isolator and design method of roller-arc surface

Abstract

The application discloses a roller-based nonlinear floating plate vibration isolator and a design method of a roller-arc surface, and the vibration isolator comprises an adapter platform, the top of the adapter platform is provided with a counterbore, the bottom wall of the counterbore is provided with a central through hole, a roller seat is slidably connected to the bottom wall of the counterbore in the radial direction, and the adapter platform is threadedly connected with an external floating plate adapter; an elastic buffer is located between the adapter platform and a base, the bottom end of a stabilizing rod is fixedly connected to the base, the top end of the stabilizing rod extends into the counterbore through the central through hole, a locking nut is located in the counterbore and is threadedly connected with the stabilizing rod, an arc surface is annularly arranged on the outer side wall of the locking nut, a roller is rotatably connected to the roller seat, and the roller abuts against the arc surface; one end of an elastic element is connected to the roller seat, and the other end of the elastic element is connected to the inner side wall of the counterbore, the vibration isolator is modularly designed, convenient for later maintenance, simple in high-precision rigidity design, and the elastic element and the roller structure are utilized, so that the vibration isolator can accurately output the required support reaction force to the floating plate.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of rail transit technology, in particular to a nonlinear floating slab vibration isolator based on a roller and a design method of a roller-arc surface. BACKGROUND

[0002] The vibration and noise caused by urban rail transit have a significant impact on the life of residents along the line and even the structural safety of the superstructure. The floating slab track bed system is one of the most comprehensive performance means among the existing vibration reduction tracks, and has achieved wide engineering application in the field of urban rail transit.

[0003] Currently, the floating slab vibration isolator mainly uses linear vibration isolation principles. With the loading of train axle weight, the natural frequency of the vibration isolation system gradually decreases under variable mass, which may cause low-frequency resonance damage. At the same time, the bearing capacity and low-frequency vibration isolation performance of the vibration isolator based on linear vibration isolation theory face an irreconcilable contradiction.

[0004] On the other hand, the current floating slab vibration isolator mainly includes two categories of spiral steel spring vibration isolators and rubber vibration isolators. The spiral steel spring vibration isolator has high design precision for vertical stiffness, and the rubber spring can be conveniently designed for specific stiffness in multiple directions. However, the linear stiffness characteristics of spiral steel springs or rubber springs still cannot reconcile the complex requirements of high bearing capacity, strong displacement suppression, and high vibration isolation performance. Therefore, it is highly necessary to design a strong nonlinear floating slab vibration isolator based on nonlinear dynamics theory with high bearing capacity, strong displacement suppression, and high vibration isolation performance.

[0005] Therefore, how to provide a nonlinear floating slab vibration isolator based on a roller and a design method of a roller-arc surface is a problem that needs to be solved by those skilled in the art. SUMMARY

[0006] Therefore, the present application provides a nonlinear floating slab vibration isolator based on a roller and a design method of a roller-arc surface. The nonlinear restoring force characteristics of the vibration isolator can be accurately realized, and the high bearing capacity, strong displacement suppression, and high performance low-frequency vibration isolation requirements can be simultaneously met under any working condition according to actual needs. The outer thread of the transfer platform can realize high-precision stepless adjustment of the initial height of the vibration isolator, avoid the decline of vibration isolation performance caused by the sensitivity of the nonlinear mechanical properties of the vibration isolator to the initial conditions, and ensure the accuracy of the floating slab jacking.

[0007] In order to achieve the above object, the present application adopts the following technical scheme: a nonlinear floating slab vibration isolator based on a roller is used to be installed on a floating slab, comprising: an adapter table, a counterbore is arranged on the top of the adapter table, a center through hole is arranged on the bottom wall of the counterbore, a plurality of guide grooves are arranged on the bottom wall of the counterbore in the radial direction, a roller seat is slidably connected in the guide grooves, the adapter table is threadedly connected with an external floating slab adapter;

[0008] a base, the base is located on a foundation and a clamping groove is arranged on the top edge of the base;

[0009] an elastic buffer, the elastic buffer is located between the adapter table and the base, the top of the elastic buffer abuts against the bottom of the adapter table, and the bottom of the elastic buffer is located in the clamping groove;

[0010] a stabilizing rod, the bottom end of the stabilizing rod is fixedly connected with the base, the top end of the stabilizing rod extends into the counterbore through the center through hole, and the outer side wall of the stabilizing rod is slidably connected with the inner side wall of the center through hole;

[0011] a locking nut, the locking nut is located in the counterbore and is threadedly connected with the stabilizing rod, an arc surface is arranged on the outer side wall of the locking nut, a roller is rotatably connected on the roller seat, and the roller abuts against the arc surface;

[0012] a resilient member, the resilient member is horizontally located in the counterbore, one end of the resilient member is connected with the roller seat, and the other end is connected to the inner side wall of the counterbore, the downward movement of the adapter table causes the roller to move on the arc surface, the transverse movement of the roller seat causes the resilient member to be elastically deformed.

[0013] The present application has the advantages that: the vibration isolator has the ability of modular assembly and stepless height adjustment, the adapter table is connected with the floating slab through the floating slab adapter, the stepless height adjustment of the floating slab can be realized by rotating the adapter table, the nonlinear buffering and vibration isolation performance is realized by the cooperation of the elastic buffer and the resilient member, the arc surface on the locking nut is used in cooperation with the resilient member, when the train passes, the floating slab moves downward, the roller seat moves downward synchronously with the adapter table, due to the cooperation relationship between the roller and the arc surface, the roller seat moves transversely and compresses the resilient member, in this process, the vertical counterforce is generated and cooperates with the counterforce of the elastic buffer to realize the nonlinear vibration isolation effect, since the resilient member is mainly subjected to transverse compression, the transverse force is larger after compression, which improves the transverse stability effect of the vibration isolator.

[0014] Preferably, an outward convex part is arranged on the outer circumferential wall of the locking nut and above the arc surface, and an outward structure is arranged on the top of the locking nut.

[0015] The technical effect produced thereby is that the outer convex part is used for limiting the travel position of the roller on the locking nut, and will not come out, and the outer structure on the locking nut is convenient for screwing adjustment, and realizes the threaded assembly of the locking nut and the stable rod.

[0016] Preferably, the outer diameter size of the arc surface corresponding to the locking nut is arranged to gradually decrease first and then gradually increase in the axial direction.

[0017] The technical effect produced thereby is that the arc surface on the locking nut promotes the lateral movement of the roller seat when the roller moves in the axial direction, and further promotes the elastic deformation of the elastic member, realizes the nonlinear vibration isolation effect of the vibration isolator, and avoids train resonance.

[0018] Preferably, the guide groove is a dovetail groove structure, the bottom of the roller seat is provided with a sliding block matched with the dovetail groove structure, one side of the roller seat is rotatably connected with a roller, and the other side of the roller seat is provided with a brim limiting the installation position of the elastic member.

[0019] The technical effect produced thereby is that the dovetail groove structure can make the roller seat move synchronously with the adapter platform, the roller seat can also slide laterally relative to the adapter platform, the compression of the elastic member is completed, and the brim can limit the installation position of the elastic member.

[0020] Preferably, the elastic member is a spring, and the elastic members are distributed in the circumferential direction, and the side wall of the counterbore is provided with a stop block limiting the elastic member.

[0021] The technical effect produced thereby is that the elastic member is a spring, a plurality of springs distributed in the circumferential direction have strong lateral stability in the compressed state, the stop block can also limit the position of the elastic member, and the adapter platform moves up and down.

[0022] Preferably, the elastic buffer is a steel spring, the bottom of the adapter platform is provided with a limiting platform matched with the installation of the steel spring, the adapter platform and the base are connected in dynamic sealing sliding connection, the bottom edge of the stable rod is provided with a variable diameter section, and the clamping groove contains damping liquid.

[0023] The technical effect produced thereby is that there is an installation gap between the adapter platform and the base, the purpose is to realize the up and down movement of the floating slab and the adapter platform, the dynamic sealing sliding connection does not affect the rotational adjustment of the adapter platform, and the damping liquid further enhances the damping and shock absorption effect.

[0024] Preferably, the bottom of the base is provided with a positioning pin clamping groove, and the positioning pin clamping groove is embedded with a positioning pin on the foundation.

[0025] The technical effect produced thereby is that the positioning pin clamping groove is used for installing the vibration isolator, and the positioning pin is used to limit the position of the vibration isolator on the foundation.

[0026] A roller-camber design method of a floating slab vibration isolator, comprising the following steps:

[0027] Step one: first analyze the wheel-rail load spectrum to determine the frequency distribution range of the dynamic load energy concentration of the isolator;

[0028] Step two: calculate the equivalent initial static load mass of a single isolator according to the arrangement form of the floating slab-isolator array, and determine the equivalent initial load position of each isolator in combination with the stiffness of the elastic buffer;

[0029] Step three: based on the nonlinear restoring force curve required by the isolator, analytically design the roller center trajectory function, and accurately design the camber shape in combination with the roller radius.

[0030] The technical effect produced thereby is that the roller-camber directly affects the support reaction force effect of the floating slab under displacement, affects the nonlinear damping performance of the isolator, and can accurately meet the support reaction force requirement of the isolator at any load-induced displacement, while ensuring the load-bearing capacity of the floating slab and train, and taking into account the displacement suppression and low-frequency vibration isolation performance of the damping track system.

[0031] Preferably, in step one, the loading frequency of the quasi-static component of the wheel-rail load spectrum caused by vehicle axle load impact loading is calculated according to the train running speed and the distance between bogies, and the loading frequency is taken as a threshold value to determine the lower limit of the frequency of the dynamic excitation load energy of the isolator;

[0032] Again, taking the lower limit of the frequency of the dynamic excitation load energy of the isolator as a threshold value, the vibration signals below the threshold frequency are defined as quasi-static loads by filtering, and the remaining signals are defined as dynamic loads;

[0033] In step two, the average mass of a single isolator is calculated according to the total mass of a single floating slab and a pair of rails of the same length as the floating slab and the corresponding fasteners, in combination with the number of isolators involved in the single floating slab, and the average mass is taken as the equivalent initial static load mass of a single isolator.

[0034] According to the equivalent initial static load mass m0 of a single isolator, the installation height difference of the locking nut is calculated using the following formula:

[0035]

[0036] Where h represents the position of the upper end point of the camber surface of the locking nut under no-load condition, k0 represents the stiffness of the elastic buffer, and g≈9.81 m / s 2 represents the acceleration of gravity;

[0037] With the cam arc surface upper end position of the locking nut when the isolator is empty as the starting position, the locking nut is rotated, so that the locking nut generates a vertical displacement of Ah downward, and the assembly is completed.

[0038] The technical effect generated thereby is that the arrangement and initial assembly process of the isolator are completed according to the load analysis under the conditions of empty load and heavy load.

[0039] Preferably, in the step three, the nonlinear restoring force function F(X) required by the isolator is analytically solved by the following formula:

[0040] nk(S(X)-B)S'(X)+k0(X-B0)+m0g=F(X)(1.2)

[0041] Wherein, k represents the stiffness of a single elastic element, n represents the number of elastic elements, S(X) represents the roller center trajectory function, B represents the horizontal distance between the single roller center and the outer wall of the stable rod in the relaxed state of the elastic element, B0 represents the compression amount of the elastic buffer of the isolator under the equivalent initial static load, X represents the vertical displacement of the load of the isolator, S'(X) represents the first derivative of the roller center trajectory function with respect to the load displacement of the isolator;

[0042] The analytical expression of the cam surface is solved according to the following formula

[0043]

[0044] Wherein, R represents the radius of the roller, X c and Y c respectively represent the vertical and horizontal coordinates of the cam surface.

[0045] The technical effect generated thereby is that the size of the roller and the shape parameters of the cam surface can be calculated according to the above formula, and the support reaction force requirement of the isolator can be met in this state. BRIEF DESCRIPTION OF DRAWINGS

[0046] Fig. 1 It is a structural diagram of the nonlinear floating plate isolator based on the roller of the application;

[0047] Fig. 2 It is a main view of the nonlinear floating plate isolator based on the roller of the application;

[0048] Fig. 3 It is a roller seat installation schematic diagram of the nonlinear floating plate isolator based on the roller of the application;

[0049] Fig. 4 It is an application diagram of the nonlinear floating plate isolator based on the roller of the application.

[0050] 1 adapter, 2 sink hole, 3 floating plate, 4 guide groove, 5 roller seat, 6 floating plate adapter, 7 base, 8 clamping groove, 9 elastic buffer, 10 stabilizing rod, 11 locking nut, 12 camber, 13 roller, 14 elastic element, 15 outer convex part, 16 outer square structure, 17 sliding block, 18 hat brim, 19 stop block, 20 positioning pin clamping groove, 21 foundation, 22 positioning pin, 23 locking bolt, 24 pre-buried cylinder, 25 external thread, 26 lapping lug, 27 bearing table, 28 support plate. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0052] Reference is made to the drawings of the present application Figs. 1 to 4 According to an embodiment of the present application, a nonlinear floating plate vibration isolator based on a roller is used to be installed on a floating plate 3, which comprises: an adapter 1, the outer part of the adapter has an external thread 25 structure, the top of the adapter 1 is provided with a sink hole 2, the bottom wall of the sink hole 2 is provided with a central through hole, and a plurality of (three in this embodiment) guide grooves 4 are arranged on the bottom wall of the sink hole 2 in the radial direction, a roller seat 5 is slidably connected in the guide groove 4, the roller seat can slide in the radial direction (transverse direction) of the sink hole, and the adapter 1 can be threadedly connected with an external floating plate adapter 6; the floating plate adapter is a transition piece, which can be directly fixed on the floating plate or connected through a pre-buried cylinder 24, the inner wall of the pre-buried cylinder 24 is provided with a support plate 28, the outer side wall of the floating plate adapter 6 is provided with a lapping lug 26, the lapping lug is provided with a bolt hole, the outer side wall of the floating plate adapter 6 and below the lapping lug 26 is provided with a bearing table 27, the support plate 28 is located between the lapping lug 26 and the bearing table 27, and the locking bolt 23 is connected in the bolt hole to fix the position of the pre-buried cylinder and the floating plate adapter, the floating plate adapter has an internal thread structure matched with the external thread of the adapter, and the stepless height adjustment of the floating plate can be realized by rotating the adapter;

[0053] The base 7 is a base, which is located on the foundation 21 and the top edge of the base 7 is provided with a clamping groove 8;

[0054] The elastic buffer 9 is located between the adapter 1 and the base 7, and a steel spring is selected as the elastic buffer in this embodiment, the top of the elastic buffer 9 abuts against the bottom of the adapter 1, and the bottom of the elastic buffer 9 is located in the clamping groove 8, so that the relative approach or distance between the adapter and the base can be realized;

[0055] The steady rod 10 is fixed at the bottom end with the base 7 and extends into the sink hole through the center hole, and the outer wall of the steady rod 10 is in sliding connection with the inner wall of the center hole; the steady rod connects the base and the adapter platform into a system structure, and can also stabilize the upward and downward movement of the adapter platform.

[0056] The locking nut 11 is located in the sink hole 2 and is in threaded connection with the steady rod 10, and the outer wall of the locking nut 11 is provided with an arc surface 12, which is similar to a cam structure, and the roller seat 5 is rotatably connected with a roller 13, and the roller 13 is in abutment with the arc surface 12; since the arc surface is not a plane, the upward and downward movement of the roller will cause the roller seat to compress the elastic member;

[0057] The elastic member 14 is also a steel spring in this embodiment, and is horizontally located in the sink hole 2; one end of the elastic member 14 is connected with the roller seat 5, and the other end is connected with the inner wall of the sink hole; the downward movement of the adapter platform 1 causes the roller 13 to move on the arc surface 12, and the transverse movement of the roller seat 5 causes the elastic member 14 to elastically deform; in this process, there is not only a horizontal force but also a vertical reaction force, and the elastic buffer member is used to complete the damping effect.

[0058] In other embodiments, the outer circumferential wall of the locking nut 11 is provided with an outer convex portion 15 above the arc surface, which limits the limit position of the roller movement and prevents the roller from being unsheathed; the top of the locking nut 11 is provided with an outer square structure 16, which is matched with a wrench to adjust the locking nut; a safety cap 29 is additionally arranged above the top end of the steady rod, i.e., above the locking nut, to prevent the locking nut from being loosened and affecting the damping effect.

[0059] In other embodiments, the outer diameter of the locking nut 11 corresponding to the arc surface 12 is first gradually reduced and then gradually increased in the axial direction, which needs to be designed according to the reaction force demand of the vibration isolator.

[0060] In other embodiments, the guide groove 4 is a dovetail groove structure, the bottom of the roller seat 5 is provided with a sliding block 17 matched with the dovetail groove structure, the roller seat 5 is rotatably connected with the roller 13 through a roller support on one side, and the other side of the roller seat 5 is provided with a brim 18 limiting the installation position of the elastic member, so as to ensure the synchronous upward or downward movement of the elastic member.

[0061] The elastic members 14 are arranged at intervals in the circumferential direction, and the side wall of the sink hole 2 is provided with a stop block 19 limiting the elastic members, so as to realize the synchronous upward and downward movement of the elastic members and the adapter platform.

[0062] In other embodiments, the elastic buffer 9 is a steel spring, the bottom of the adapter platform 1 is provided with a limiting platform matched with the installation of the steel spring, the adapter platform 1 is in dynamic sealing sliding connection with the base 7, the bottom edge of the stabilizing rod 10 is provided with a variable diameter section, and the damping liquid is provided in the clamping groove 8.

[0063] In other specific embodiments, the middle of the bottom of the base 7 is provided with a positioning pin clamping groove 20, the positioning pin clamping groove 20 can be embedded with a positioning pin 22 on the foundation, the installation position of the vibration isolator on the foundation is limited, and the installation position of the floating slab is further limited.

[0064] The design of the upper arc surface of the locking nut and the roller of the application is as follows:

[0065] Based on the wheel-rail load characteristics of the train running state, the threshold frequency of the quasi-static and dynamic load decoupling of the vibration isolator load spectrum is determined, and the lower limit of the frequency of the dynamic excitation load energy of the vibration isolator is determined according to the energy distribution band of the dynamic component;

[0066] Further, the method for determining the lower limit of the frequency of the dynamic excitation load energy of the vibration isolator comprises the following steps:

[0067] Step 1.1: The lower limit of the frequency of the dynamic excitation load energy of the vibration isolator is calculated according to the following formula, denoted as f:

[0068]

[0069] Wherein, v represents the train running speed, and L represents the distance between the vehicle bogies.

[0070] Step 2: According to the arrangement form of the floating slab-vibration isolator array, the equivalent initial static load mass of a single vibration isolator is calculated, and the equivalent initial load position of each vibration isolator is determined in combination with the stiffness of the elastic buffer (steel spring);

[0071] Further, the determination of the equivalent initial load position of a single vibration isolator comprises the following steps:

[0072] Step 2.1: The mass of a single floating slab is determined according to the configuration of the single floating slab, denoted as m s ;

[0073] Step 2.2: The mass of a single steel rail matched with the longitudinal length of the single floating slab is determined according to the following calculation formula, denoted as m r :

[0074] m r =ρSL(1.8)

[0075] Wherein, ρ represents the mass density of the steel rail, S represents the longitudinal cross-sectional area of the steel rail, and L represents the longitudinal length of the single floating slab.

[0076] Step 2.3: Determine the total mass of the fasteners assembled on the single slab floating slab, denoted as m, according to the following calculation formula f :

[0077] m f = n f m f0 (1.9)

[0078] wherein n f represents the number of fasteners assembled on the single slab floating slab, represents the mass of a single fastener.

[0079] Step 2.4: Calculate the total static load mass of the single slab floating slab based on the mass of the single slab floating slab, the mass of a single steel rail matched with the longitudinal length of the single slab floating slab, and the total mass of the fasteners assembled on the single slab floating slab, denoted as m, according to the following calculation formula:

[0080] m = m s + 2m r +m f (1.10)

[0081] Step 2.5: Determine the equivalent initial static load mass of a single vibration isolator, denoted as m0, according to the following formula:

[0082]

[0083] wherein n represents the number of vibration isolators assembled under the single slab floating slab.

[0084] Step 2.6: Calculate the installation height difference of the locking nut using the following formula based on the equivalent initial static load mass m0 of a single vibration isolator:

[0085]

[0086] wherein h represents the position of the upper end point of the cam surface of the locking nut under the no-load condition of the vibration isolator, k0 represents the stiffness of the elastic buffer, g ≈ 9.81 m / s 2 represents the acceleration of gravity. Starting from the position of the upper end point of the cam surface of the locking nut under the no-load condition of the vibration isolator, rotate the locking nut to produce a vertical displacement of Δh downward, and complete the assembly of the locking nut and the roller.

[0087] Step 3: Analytically design the roller center trajectory function based on the required arbitrary nonlinear restoring force curve of the vibration isolator, and accurately design the shape of the cam surface on the locking nut in combination with the roller radius;

[0088] Further, the analytical cam surface shape calculation includes the following steps:

[0089] Step 3.1: The roller center trajectory function is analytically solved for the nonlinear restoring force function F(X) required by the isolator as follows:

[0090]

[0091] or

[0092]

[0093] where k represents the single horizontal spring stiffness, n represents the number of horizontal springs, S(X) represents the roller center trajectory function, B represents the horizontal distance between the single roller center and the outer wall of the stabilizing rod when the horizontal spring is in a relaxed state, B0 represents the compression amount of the vertical spring of the isolator under the equivalent initial static load, X represents the vertical displacement of the load of the isolator, where S'(X) represents the first derivative of the roller center trajectory function with respect to the load displacement of the isolator, S0 represents the horizontal distance between the roller center and the outer wall of the stabilizing rod under the equivalent initial static load of the isolator, and x represents the integral variable.

[0094] Step 3.2: The cam outer surface function is analytically solved as follows

[0095]

[0096] where R represents the roller radius, X c and Y c represent the vertical and horizontal coordinates of the arc surface, respectively.

[0097] The locking nut arc surface shape design method based on the restoring force function provided by the application ensures that the isolator provides accurate counterforce to the load at any load position based on the restoring force requirement of any isolator, thereby simultaneously achieving high load capacity, strong displacement suppression, and high-performance low-frequency isolation capability. The application provides a new solution for the design of high-performance floating plate passive isolators that require displacement suppression and low-frequency isolation.

[0098] The strong nonlinear floating plate isolator based on the roller provided by the application can realize high-precision stepless adjustment of the initial height of the isolator by using the external thread of the adapter platform, avoid the decline in isolation performance caused by the sensitivity of the nonlinear mechanical properties of the isolator to the initial conditions, and ensure the accuracy of the floating plate jacking.

[0099] For the device and use method disclosed in the embodiments, since they correspond to the method disclosed in the embodiments, the description is relatively simple, and the relevant parts are described in the method part.

[0100] The foregoing description of the disclosed embodiments enables a person skilled in the art to make or use the application. Modifications of these embodiments will occur to persons of skill in the art, and, while certain modifications are discussed, it is desired to be protected in accordance with the spirit and scope of the application. Therefore, the application is not limited to the specific embodiments shown and described, but only by the scope of the appended claims, unless otherwise specified.

Claims

1. A roller-based non-linear floating slab vibration isolator to be mounted on a floating slab (3), characterized in that, It includes: The adapter (1), the top of the adapter (1) is provided with a counterbore (2), the bottom wall of the counterbore (2) is provided with a center through hole, a plurality of guide grooves (4) are arranged on the bottom wall of the counterbore (2) in the radial direction, a roller seat (5) is slidably connected in the guide groove (4), the adapter (1) can be threadedly connected with an external floating plate adapter (6); The base (7) is located on the foundation (21), and the top edge of the base (7) is provided with a clamping groove (8); The elastic buffer (9) is located between the adapter (1) and the base (7), the top of the elastic buffer (9) abuts against the bottom of the adapter (1), and the bottom of the elastic buffer (9) is located in the clamping groove (8); The stable rod (10) is fixedly connected with the base (7) at the bottom end and extends into the counterbore through the center through hole at the top end, and the outer side wall of the stable rod (10) is slidably connected with the inner side wall of the center through hole; The locking nut (11) is located in the counterbore (2) and is threadedly connected with the stable rod (10), an arc surface (12) is arranged on the outer side wall of the locking nut (11), a roller (13) is rotatably connected to the roller seat (5), and the roller (13) abuts against the arc surface (12); An outer convex portion (15) is arranged on the outer circumferential side wall of the locking nut (11) and above the arc surface, an outer structure (16) is arranged on the top of the locking nut (11), and the outer diameter size of the locking nut (11) corresponding to the arc surface (12) is arranged in the axial direction to gradually decrease and then gradually increase; The elastic element (14) is horizontally located in the counterbore (2), one end of the elastic element (14) is connected with the roller seat (5), and the other end is connected to the inner side wall of the counterbore, the downward movement of the adapter (1) causes the roller (13) to move on the arc surface (12), and the transverse movement of the roller seat (5) causes the elastic element (14) to elastically deform.

2. A roller-based nonlinear floating slab vibration isolator according to claim 1, wherein The guide groove (4) is a dovetail groove structure, the bottom of the roller seat (5) is provided with a sliding block (17) matched with the dovetail groove structure, one side of the roller seat (5) is rotatably connected with the roller (13), and the other side of the roller seat (5) is provided with a brim (18) limiting the installation position of the elastic force element.

3. A roller-based nonlinear floating slab vibration isolator according to claim 1, wherein The elastic element (14) is a spring, the elastic element (14) is distributed in the circumferential direction, and the side wall of the counterbore (2) is provided with a stop block (19) limiting the elastic force element.

4. A roller-based nonlinear floating slab vibration isolator according to claim 1, wherein The elastic buffer (9) is a steel spring, the bottom of the adapter (1) is provided with a limiting table matched with the installation of the steel spring, the adapter (1) and the base (7) are dynamically sealed and slidably connected, the bottom edge of the stable rod (10) is provided with a variable diameter section, and the clamping groove (8) contains damping liquid.

5. A roller-based nonlinear floating slab vibration isolator according to claim 4, wherein The bottom of the base (7) is provided with a positioning pin clamping groove (20), and the positioning pin clamping groove (20) can be embedded with a positioning pin (22) on the foundation.

6. A method of roller-globoid design of a floating slab isolator according to any one of claims 1-5, characterized in that, The steps include: Step one: Firstly, the wheel-rail load spectrum is analyzed to determine the frequency distribution range of the dynamic load energy of the isolator; Step two: According to the arrangement form of the floating slab-isolator array, the equivalent initial static load mass of a single isolator is calculated, and the equivalent initial load position of each isolator is determined in combination with the stiffness of the elastic buffer; Step three: Based on the nonlinear restoring force curve required by the isolator, the roller center trajectory function is analytically designed, and the arc surface shape is accurately designed in combination with the roller radius.

7. The method of designing a roller-crown of a floating slab isolator according to claim 6, wherein, In step one, the loading frequency of the quasi-static component of the wheel-rail load spectrum caused by the vehicle axle load impact is calculated according to the train running speed and the distance between bogies, and the loading frequency is taken as a threshold to determine the frequency lower limit of the dynamic excitation load energy of the isolator; Then, taking the frequency lower limit of the dynamic excitation load energy of the isolator as a threshold, the vibration signals below the threshold frequency are defined as quasi-static loads by filtering, and the remaining signals are defined as dynamic loads; In step two, according to the total mass of a single floating slab and a pair of rails with the same length as the floating slab and the corresponding fasteners, in combination with the number of isolators involved in the single floating slab, the average mass received by a single isolator is calculated, and the average mass is taken as the equivalent initial static load mass of a single isolator; According to the equivalent initial static load mass of the single vibration isolator The installation height difference of the lock nut is calculated by the following formula: wherein, represents the position of the upper end point of the cammed arc of the lock nut in the unloaded condition of the vibration isolator, represents the stiffness of the elastic cushion, represents the acceleration due to gravity; Starting from the position of the upper end of the cam arc surface of the locking nut when the vibration isolator is unloaded, rotate the locking nut to make it move downwards. The vertical displacement completes the assembly.

8. The method of designing a roller-crown of a floating slab isolator according to claim 6, wherein, In the step three, the nonlinear restoring force function required for the vibration isolator The roller center trajectory function is analytically solved by the following equation: ； wherein, represents the stiffness of a single elastic member, represents the number of elastic members, represents the function of the center trajectory of the roller, represents the horizontal distance between the center of a single roller and the outer wall of the stabilizing rod when the elastic member is in a relaxed state, represents the compression amount of the elastic buffer of the vibration isolator under the equivalent initial static load, represents the vertical displacement of the vibration isolator load, represents the first derivative of the function of the center trajectory of the roller with respect to the displacement of the vibration isolator load; The arc surface function analytical expression is solved according to the following formula ； wherein represents the radius of the roller, and respectively represent the vertical and horizontal coordinates of the arc surface.

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