Sleeper embedded damping device using magneto-rheological elastomer

Abstract

The invention discloses a sleeper embedded damping device using magnetorheological elastomers, and belongs to the technical field of rail transit damping. The device comprises a base table of an inverted-T-shaped structure and a rail pressing assembly, magneto-rheological elastic damping mechanisms are symmetrically arranged at the sunken positions of the two sides of the base table, and the upper sides of the magneto-rheological elastic damping mechanisms are connected with the rail pressing assembly. The magneto-rheological elastic damping mechanism comprises a barrel, a piston assembly, a connecting table, a shaft rod and electromagnetic liquid, the piston assembly can move up and down in the barrel, a magnetic field is generated through a magnet exciting coil to change the rheological property of the electromagnetic liquid, and dynamic damping adjustment is achieved. The rail pressing assembly is integrated with a vibration sensor, rail vibration can be monitored in real time, and then the damping characteristic is adjusted. The sleeper damping device solves the problems that an existing sleeper damping device is fixed in damping characteristic and cannot be dynamically adjusted, has the advantages of being modular in design, convenient to install and maintain, adaptive in damping effect and the like, and can effectively improve the running comfort of rail traffic and prolong the service life of a rail structure.

Description

Technical Field

[0001] This invention relates to the field of vibration reduction technology in rail transit, and more specifically, to a sleeper-embedded vibration reduction device utilizing a magnetorheological elastomer. Background Technology

[0002] During the operation of rail transit systems, the interaction between wheels and tracks generates continuous vibrations and noise, which not only affect passenger comfort but also damage the track structure and the surrounding environment. Traditional sleeper damping devices mostly use passive damping elements such as rubber and springs, whose damping characteristics are fixed and cannot be dynamically adjusted according to actual vibration conditions. Therefore, when faced with complex and variable track conditions, the damping effect is difficult to achieve optimal results.

[0003] In existing technologies, some magnetorheological damping devices have been applied in the rail transit field, but their modularity is low, making maintenance and replacement inconvenient. Furthermore, they lack real-time vibration monitoring and adaptive adjustment capabilities, failing to adjust damping characteristics promptly according to real-time changes in track vibration, thus their damping effect still needs improvement.

[0004] Therefore, there is an urgent need to develop a modular, embedded sleeper vibration damping device that can monitor track vibration in real time and dynamically adjust damping characteristics to adapt to complex and varied track conditions, thereby improving the vibration damping effect and ease of installation and maintenance. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a sleeper-embedded shock absorption device that utilizes a magnetorheological elastomer, thereby solving the problem that most existing sleeper shock absorption devices are passive structures with fixed damping characteristics, and cannot adjust the shock absorption effect in real time according to track vibration.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A sleeper-embedded shock absorption device utilizing magnetorheological elastomers includes a base and a rail-pressing assembly. The base has a convex-shaped structure with magnetorheological elastic damping mechanisms symmetrically arranged in the recesses on both sides. The rail-pressing assembly is connected to the upper side of the magnetorheological elastic damping mechanism. The magnetorheological elastic damping mechanism includes a cylinder, a piston assembly, a connecting platform, a shaft, and an electromagnetic fluid. The cylinder is filled with electromagnetic fluid. The piston assembly is located inside the cylinder and can move up and down. A shaft is fixedly connected to the upper side of the piston assembly. A connecting platform for connecting a pressure rail assembly is fixedly provided at the upper end of the shaft.

[0007] Furthermore, the piston assembly includes a piston plate, magnetic flow holes, and an excitation coil; the piston plate is adapted to the specifications of the cylinder and is located inside the cylinder, with an excitation coil arranged circumferentially inside it, and a plurality of magnetic flow holes arranged circumferentially on the piston plate outside the excitation coil.

[0008] Furthermore, a protective box is enclosed on the outside of the cylinder to protect the cylinder and internal components; several studs are fixed on the base, and ear plates are provided on both sides of the protective box, with the ear plates connected to the studs by nuts; the shaft is connected to the cylinder and the protective box in a sealed and movable manner through a mechanical seal.

[0009] Furthermore, the shaft has a cable routing hole inside for connecting cables. The upper end of the cable routing hole extends radially through the shaft, and the lower end extends radially through the shaft to connect to the excitation coil.

[0010] Furthermore, the rail pressing assembly includes a rail pressing block, a vibration sensor, a rail pressing groove, a pressure plate, and bolts; the pressure plate is fixedly connected to the connecting platform by several bolts, a rail pressing block is fixedly connected to one end of the pressure plate, a rail pressing groove adapted to the contact of the rail is opened on the bottom surface of the rail pressing block, a vibration sensor is inserted inside the rail pressing block, and the detection surface of the vibration sensor is in contact with the rail.

[0011] Furthermore, a rubber pad B is embedded on the top surface of the base to isolate the rail from direct contact with the base; a rubber pad A is provided at the bottom of the base to isolate the base from the sleeper for shock absorption and buffering.

[0012] Furthermore, both sides of the base are provided with downward protruding limiting plates for locking the sleeper to achieve limiting.

[0013] Furthermore, the electromagnetic fluid is a magnetorheological elastomer material, whose rheological properties can change with the magnetic field strength generated by the excitation coil. When the magnetic field strength increases, the viscosity of the electromagnetic fluid increases and the damping force increases; when the magnetic field strength decreases, the viscosity of the electromagnetic fluid decreases and the damping force decreases.

[0014] Furthermore, the vibration sensor is electrically connected to an external control system. The external control system can adjust the current of the excitation coil according to the vibration signal detected by the vibration sensor, thereby changing the magnetic field strength and realizing dynamic adjustment of the damping characteristics.

[0015] Furthermore, the protective housing is made of high-strength alloy material, which has good pressure resistance and impact resistance, and can effectively protect the internal cylinder and piston assembly from damage by the external environment.

[0016] Furthermore, both rubber pad A and rubber pad B are made of high-damping rubber material, which has good shock absorption and buffering performance, can assist the magnetorheological elastic damping mechanism in shock absorption, and at the same time play a role in isolation and noise reduction.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention uses magnetorheological elastomer as the damping medium. The magnetic field generated by the excitation coil changes the rheological properties of the electromagnetic fluid, thereby realizing the dynamic adjustment of the damping characteristics. The damping force can be adjusted according to the real-time vibration of the track to adapt to different track conditions and improve the vibration reduction effect.

[0018] 2. This invention adopts a modular embedded design. The base is inserted into the sleeper through a limiting plate, which is convenient for installation. At the same time, the magnetorheological elastic damping mechanism is connected to the base through studs and nuts, which is convenient for maintenance and replacement, and does not require large-scale modification of the track structure.

[0019] 3. This invention integrates a vibration sensor, which can monitor the vibration of the track in real time. It can also achieve adaptive adjustment of damping characteristics through an external control system, which has a high degree of automation and improves the accuracy and timeliness of vibration reduction.

[0020] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 This is a front view of the present invention.

[0024] Figure 3 This is a schematic diagram of the bottom structure of the present invention.

[0025] Figure 4 This is a partial structural diagram of the present invention.

[0026] Figure 5 This is a schematic diagram of the pressure rail assembly and the magnetorheological elastic damping mechanism in this invention.

[0027] Figure 6 This is a cross-sectional view of the overall structure of the pressure rail assembly and the magnetorheological elastic damping mechanism in this invention.

[0028] Figure 7 This is a partial cross-sectional view of the present invention.

[0029] Figure 8 This is a schematic diagram showing the usage state of the device in this invention.

[0030] In the diagram: 1. Limiting plate; 2. Rubber pad A; 3. Base; 4. Rail clamping assembly; 41. Rail clamping block; 42. Vibration sensor; 43. Rail clamping groove; 44. Pressure plate; 45. Bolt; 5. Magnetorheological elastic damping mechanism; 51. Protective housing; 52. Stud; 53. Nut; 54. Ear plate; 55. Connecting platform; 56. Mechanical seal; 57. Cylinder; 58. Electromagnetic fluid; 59. Piston assembly; 591. Piston plate; 592. Magnetic flow hole; 593. Excitation coil; 510. Shaft; 511. Wiring hole; 6. Rubber pad B. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1: like Figures 1 to 8 As shown, this embodiment provides a sleeper-embedded shock absorption device using a magnetorheological elastomer, including a base 3 and a rail clamping assembly 4; Among them, the base 3 is a convex-shaped structure, and magnetorheological elastic damping mechanism 5 is symmetrically provided on the recesses on both sides. The upper side of the magnetorheological elastic damping mechanism 5 is connected to the pressure rail assembly 4.

[0033] The magnetorheological elastic damping mechanism 5 includes a cylinder 57, a piston assembly 59, a connecting platform 55, a shaft 510, and an electromagnetic fluid 58. The cylinder 57 is filled with electromagnetic fluid 58, which is a magnetorheological elastic material whose rheological properties can change with the magnetic field strength. The piston assembly 59 is located inside the cylinder 57 and can move up and down. The shaft 510 is fixedly connected to the upper side of the piston assembly 59, and the upper end of the shaft 510 is fixedly provided with a connecting platform 55 for connecting the pressure rail assembly 4.

[0034] In this embodiment, the piston assembly 59 includes a piston plate 591, magnetic flow holes 592, and an excitation coil 593. The piston plate 591 is adapted to the specifications of the cylinder 57 and is located inside the cylinder 57. The excitation coil 593 is arranged circumferentially inside the piston plate 591. A plurality of magnetic flow holes 592 are arranged circumferentially on the piston plate 591 outside the excitation coil 593. The magnetic flow holes 592 allow the electromagnetic fluid 58 to flow on the upper and lower sides of the piston plate 591, and at the same time facilitate the passage of magnetic field to change the rheological properties of the electromagnetic fluid 58.

[0035] In this embodiment, a protective housing 51 is enclosed on the outside of the cylinder 57. The protective housing 51 is made of high-strength alloy material and has good pressure resistance and impact resistance, protecting the cylinder 57 and its internal components from damage by the external environment. Several studs 52 are fixed on the base 3, and ear plates 54 are provided on both sides of the protective housing 51. The ear plates 54 are connected to the studs 52 by nuts 53, facilitating the installation and disassembly of the magnetorheological elastic damping mechanism 5. The shaft 510 is sealed and movablely connected to the cylinder 57 and the protective housing 51 by a mechanical seal 56 to prevent leakage of the electromagnetic fluid 58.

[0036] Furthermore, the protective housing 51 effectively protects internal components such as the cylinder 57 and piston assembly 59 from external environmental factors such as dust and rain, thus extending the service life of the device. When maintenance or replacement of the magnetorheological elastic damping mechanism 5 is required, simply unscrew the nut 53 to remove the protective housing 51 and its internal components, making maintenance and replacement convenient.

[0037] In this embodiment, the shaft 510 has a cable routing hole 511 for connecting cables. The upper end of the cable routing hole 511 extends radially through the shaft 510, and the lower end extends radially through the shaft 510 to connect to the excitation coil 593, which facilitates power supply to the excitation coil 593 and keeps the cables neatly arranged to avoid external damage.

[0038] In this embodiment, the rail clamping assembly 4 includes a rail clamping block 41, a vibration sensor 42, a rail clamping groove 43, a pressure plate 44, and bolts 45. The pressure plate 44 is fixedly connected to the connecting platform 55 by several bolts 45. The rail clamping block 41 is fixedly connected to one end of the pressure plate 44. The bottom surface of the rail clamping block 41 has a rail clamping groove 43 adapted to the contact with the rail. The rail clamping groove 43 can fit tightly with the rail to ensure the stability of the rail. A vibration sensor 42 is inserted inside the rail clamping block 41. The detection surface of the vibration sensor 42 is in contact with the rail and can detect the vibration of the rail in real time. The vibration sensor 42 is electrically connected to an external control system. The external control system can adjust the current of the excitation coil 593 according to the vibration signal detected by the vibration sensor 42, thereby changing the magnetic field strength and realizing the dynamic adjustment of the damping characteristics.

[0039] In this embodiment, a rubber pad B6 is embedded on the top surface of the base 3. The rubber pad B6 is made of high-damping rubber material and is used to isolate the rail from the base 3 to avoid direct contact, thereby playing a role in auxiliary shock absorption and noise reduction.

[0040] In addition, a rubber pad A2 is provided at the bottom of the base 3. The rubber pad A2 is also made of high-damping rubber material, which is used to isolate the base 3 from the sleeper for shock absorption and further improve the shock absorption effect. Both sides of the bottom surface of the base 3 are provided with downward protruding limiting plates 1, which are used to lock into the preset slots on the sleeper to achieve limiting and ensure the stability of the device installation.

[0041] Example 2: This embodiment provides the working principle of a sleeper-embedded shock absorption device utilizing a magnetorheological elastomer: During installation, the base 3 is inserted into the corresponding position of the sleeper by the limiting plate 1, so that the rubber pad A2 contacts the sleeper. Then, the rail is placed on the rubber pad B6 on the top surface of the base 3, and the rail is attached to the rail by the rail pressing groove 43 of the rail pressing assembly 4. The pressure plate 44 is fixed to the connecting platform 55 by bolts 45, and the installation of the device is completed.

[0042] When the train is running, the interaction between the wheels and the rails generates vibrations. Vibration sensor 42 detects the vibration signal and transmits it to the external control system. Based on the intensity and frequency of the vibration signal, the external control system adjusts the current in the excitation coil 593. The excitation coil 593 generates a magnetic field of corresponding intensity. This magnetic field passes through the magnetic flux hole 592 and acts on the electromagnetic fluid 58, altering its rheological properties. When the vibration is strong, the external control system increases the current in the excitation coil 593, increasing the magnetic field strength and the viscosity of the electromagnetic fluid 58. This increases the damping force on the piston plate 591 as it moves within the cylinder 57, effectively attenuating the vibration. When the vibration is weak, the external control system decreases the current in the excitation coil 593, decreasing the magnetic field strength and the viscosity of the electromagnetic fluid 58, thus reducing the damping force and ensuring the normal elasticity of the track.

[0043] As the piston plate 591 moves up and down, the electromagnetic fluid 58 flows through the magnetic flow hole 592 on both sides of the piston plate 591. Combined with the changes in the rheological properties of the electromagnetic fluid 58, the damping force is dynamically adjusted to effectively cope with vibrations of varying intensities. Simultaneously, rubber pads A2 and B6 assist in shock absorption and noise reduction, further enhancing the shock absorption effect and ride comfort.

[0044] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A sleeper-embedded shock absorption device utilizing a magnetorheological elastomer, comprising a base (3) and a rail clamping assembly (4), characterized in that: The base (3) is a convex-shaped structure, and magnetorheological elastic damping mechanism (5) is symmetrically provided on the recesses on both sides. The upper side of the magnetorheological elastic damping mechanism (5) is connected to the pressure rail assembly (4). The magnetorheological elastic damping mechanism (5) includes a cylinder (57), a piston assembly (59), a connecting platform (55), a shaft (510), and an electromagnetic fluid (58). The cylinder (57) is filled with electromagnetic fluid (58). The piston assembly (59) is located inside the cylinder (57) and can move up and down. The upper side of the piston assembly (59) is fixedly connected to the shaft (510). The upper end of the shaft (510) is fixedly provided with a connecting platform (55) for connecting the pressure rail assembly (4).

2. The sleeper-embedded vibration damping device utilizing a magnetorheological elastomer according to claim 1, characterized in that: The piston assembly (59) includes a piston plate (591), magnetic flow holes (592), and an excitation coil (593). The piston plate (591) is adapted to the specifications of the cylinder (57) and is located inside the cylinder (57). The excitation coil (593) is arranged circumferentially inside the cylinder. The piston plate (591) outside the excitation coil (593) has a plurality of magnetic flow holes (592) arranged circumferentially.

3. The sleeper-embedded vibration damping device utilizing a magnetorheological elastomer according to claim 1, characterized in that: The outer side of the cylinder (57) is enclosed by a protective box (51) for protecting the cylinder (57) and internal components; a number of studs (52) are fixed on the base (3); ear plates (54) are provided on both sides of the protective box (51); the ear plates (54) are connected to the studs (52) by nuts (53); the shaft (510) is connected to the cylinder (57) and the protective box (51) in a sealed and movable manner by a mechanical seal (56).

4. The sleeper-embedded vibration damping device utilizing a magnetorheological elastomer according to claim 1, characterized in that: The shaft (510) has a cable routing hole (511) inside for connecting cables. The upper end of the cable routing hole (511) extends radially through the shaft (510), and the lower end extends radially through the shaft (510) to connect to the excitation coil (593).

5. The sleeper-embedded vibration damping device utilizing a magnetorheological elastomer according to claim 2, characterized in that: The rail clamping assembly (4) includes a rail clamping block (41), a vibration sensor (42), a rail clamping groove (43), a pressure plate (44), and bolts (45). The pressure plate (44) is fixedly connected to the connecting platform (55) by several bolts (45). One end of the pressure plate (44) is fixedly connected to the rail clamping block (41). The bottom surface of the rail clamping block (41) is provided with a rail clamping groove (43) that is compatible with the rail. A vibration sensor (42) is inserted inside the rail clamping block (41). The detection surface of the vibration sensor (42) is in contact with the rail.

6. The sleeper-embedded vibration damping device utilizing a magnetorheological elastomer according to claim 3, characterized in that: The top surface of the base (3) is fitted with a rubber pad B (6) to isolate the rail from the base (3) and prevent direct contact; the bottom of the base (3) is provided with a rubber pad A (2) to isolate the base (3) from the sleeper and provide shock absorption.

7. The sleeper-embedded vibration damping device utilizing a magnetorheological elastomer according to claim 6, characterized in that: The base (3) has downward protruding limiting plates (1) on both sides of its bottom surface, which are used to lock the sleeper into place to achieve limiting.

8. The sleeper-embedded vibration damping device utilizing a magnetorheological elastomer according to claim 1, characterized in that: The electromagnetic fluid (58) is a magnetorheological elastomer material, and its rheological properties can change with the magnetic field strength generated by the excitation coil (593).

9. The sleeper-embedded vibration damping device utilizing a magnetorheological elastomer according to claim 5, characterized in that: The vibration sensor (42) is electrically connected to an external control system. The external control system can adjust the current of the excitation coil (593) according to the vibration signal detected by the vibration sensor (42).

10. The sleeper-embedded vibration damping device utilizing a magnetorheological elastomer according to claim 6, characterized in that: The protective box (51) is made of high-strength alloy material, and the rubber pad A (2) and rubber pad B (6) are both made of high-damping rubber material.

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