A sedimentation-preventing and self-resetting magneto-rheological damper

Abstract

This invention relates to a magnetorheological damper with anti-settling and self-resetting properties, comprising a dual-piston assembly, a mechanical anti-settling assembly, an active anti-settling assembly, and a self-resetting assembly. The dual-piston assembly includes a cavity, a pull rod, and a piston component; the mechanical anti-settling assembly includes a helical component, a retaining ring, and a bearing; the active anti-settling assembly includes a rocking spring, a sealed conduit, and an impact oscillator connected in sequence; and the self-resetting assembly includes a fixed cylinder, a spring, and a magnetic component. Compared with existing technologies, this invention effectively improves the damping effect of the damper by setting a dual-piston structure; it achieves active anti-settling through an impact-controlled magnetic shape memory alloy spring; furthermore, by setting a mechanical anti-settling assembly, it can achieve anti-settling function for the magnetorheological fluid even without passive input; the magnetically controlled shape memory alloy spring enables the damper's self-resetting function and can actively control the damping force of the magnetorheological fluid, thereby achieving semi-active control of the damper.

Description

Technical Field

[0001] This invention belongs to the field of vibration control of civil structures, and particularly relates to a magnetorheological damper with anti-settling and self-resetting properties. Background Technology

[0002] In recent years, with the interdisciplinary development of civil engineering, materials science, and other fields, smart materials have become an important direction in the field of structural vibration control. Smart materials such as magnetostrictive materials, piezoelectric materials, shape memory alloys, magnetorheological fluids, and electromorphic materials have been used to develop passive, semi-active, and active damping vibration reduction devices.

[0003] Magnetorheological fluids exhibit significant magnetorheological effects under the influence of an external magnetic field, displaying properties similar to solids. When no external magnetic field is applied, the fluid reverts to its original flow properties, demonstrating rapid and reversible transitions between liquid and solid states, completed within milliseconds. Magnetorheological dampers are currently widely used in vibration control. The magnetorheological fluid is the core of the damper. The density of magnetic particles is greater than that of the base fluid, and the particle settling problem caused by static settling of the magnetorheological fluid hinders its effectiveness. Therefore, reducing magnetorheological fluid settling is an important direction for the development of magnetorheological fluid dampers. Currently, commonly used techniques include improving magnetic particles, improving the base fluid, and improving the damper structure. Chinese patent CN107725663A proposes an anti-settling magnetorheological fluid damper. It uses repulsive permanent magnets appropriately distributed between the anti-settling valve and the bottom of the piston to form a repulsive magnetic field. This causes the magnetic particles in the magnetorheological suspension to be distributed along the magnetic field lines due to the relatively stable magnetic force, thus avoiding sedimentation. However, the placement of the permanent magnets close to the magnetorheological channel can cause blockage of the magnetorheological channel, reducing the working performance of the damper.

[0004] Magnetically controlled shape memory alloys (MCUs) exhibit both ferromagnetism and thermoelastic martensitic phase transformation. Compared to traditional shape memory alloys and magnetostrictive materials, MCUs possess strain levels similar to those of temperature-controlled shape memory alloys, with better controllability and faster response times. Therefore, MCUs can serve as the core material for the self-resetting mechanism of magnetorheological fluid dampers. By controlling the direction of the magnetic field, the expansion and contraction strain of the MCU can be controlled, thereby controlling the structural motion. This characteristic makes it possible to fabricate actuators.

[0005] Therefore, there is an urgent need to study a magnetorheological damper that can improve the working performance of the magnetorheological fluid damper by making full use of common methods and the properties of magnetorheological shape memory alloys. Summary of the Invention

[0006] The purpose of this invention is to overcome the defects of the prior art and provide a magnetorheological damper with anti-settling and self-resetting properties. By combining the commonly used mechanical stirring method with the magnetostrictive properties of magnetostrictive shape memory alloy, the traditional magnetorheological damper is improved, effectively enhancing the damping effect of the damper and realizing the self-resetting function of the damper and the function of preventing sedimentation of the magnetorheological fluid.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] This invention provides a magnetorheological damper with anti-settling and self-resetting properties, comprising a dual-piston assembly, a mechanical anti-settling assembly, an active anti-settling assembly, and a self-resetting assembly;

[0009] The dual-piston assembly includes a cavity, a pull rod, and a piston component. The pull rod is fixed to one end of the cavity, and the piston component is fixed inside the cavity. The cavity is filled with magnetorheological fluid.

[0010] The mechanical anti-settlement assembly includes a spiral component, a fixed ring, and a bearing. The inner ring of the bearing is fixed to the fixed ring, and the spiral component is fixed to the outer ring of the bearing.

[0011] The mechanical anti-settlement component is fixedly fixed inside the cavity;

[0012] The active anti-settlement assembly includes a rocking spring, a sealing conduit, and an impact oscillator connected in sequence; the active anti-settlement assembly is fixed to the piston component;

[0013] The self-resetting assembly includes a fixed cylinder, a spring, and a magnetic component; the spring and the magnetic component are both fixed inside the fixed cylinder; the self-resetting assembly is connected to the dual-piston assembly.

[0014] When the damper vibrates, the pull rod pulls the piston component to move axially, causing the helical gear to rotate, which in turn causes the helical blades to agitate the magnetorheological fluid. At the same time, the impact oscillator impacts the spring, causing the spring to expand and contract with the alternating magnetic field, which in turn causes the impact oscillator to oscillate the magnetorheological fluid, actively improving the precipitation problem of the magnetorheological fluid. By actively controlling the current on the magnetic component, the spring produces different deformations, realizing the self-resetting function.

[0015] Furthermore, the dual-piston assembly also includes a wire hole, an air septum, a DC wire, and a first sealing gasket;

[0016] The wire hole is provided on the piston component for installing the DC wire, which provides the electrical charge required for the excitation coil and the reset excitation coil to generate the magnetic field.

[0017] The first sealing gasket and the air baffle are fixed in sequence in the cavity, and both are close to one side of the pull rod. The space enclosed by the first sealing gasket and the cavity is filled with air.

[0018] Furthermore, the piston component includes two piston heads and a piston rod, with the piston rod connecting the two piston heads to form a double-piston structure;

[0019] The piston rod passes sequentially through the piston head, the through hole in the center of the retaining ring, and the self-resetting assembly, and is fixed to the piston head by a fixing screw;

[0020] The piston head includes a piston top cover, a piston wall, a piston bottom cover, and an excitation coil; the excitation coil is fixed to the piston wall inside the piston head.

[0021] The piston top cover, piston wall, and piston bottom cover are all sealed to prevent the magnetorheological fluid from seeping into the piston head.

[0022] Furthermore, the spiral component includes a spiral guide plate, a spiral gear, and spiral blades;

[0023] The helical gear is fixed to the outer ring of the bearing, and the helical blade is fixed to the helical gear;

[0024] The spiral guide plate consists of four pieces, with the corresponding sector angles of the four spiral guide plates being 60°. Two spiral guide plates are fixed to the piston bottom cover of one piston head, and two spiral guide plates are fixed to the piston top cover of another piston head. Both spiral guide plates are symmetrical about the center.

[0025] Furthermore, the four spiral guide plates pass through the slots on the outside of the fixing ring to ensure that the spiral gear meshes with the spiral guide plates during operation;

[0026] The angle between the edges of two adjacent spiral guide plates is 30°;

[0027] The spiral guide plate has the same spiral direction as the spiral gear.

[0028] Furthermore, the impact oscillator includes a housing, an impact excitation coil, an impact magnetically controlled shape memory alloy spring, an impact spring, an impact plate, impact particles, and an AC power conductor;

[0029] One end of the impact magnetized shape memory alloy spring is fixed to one side inside the outer shell, and the other end is fixed to the impact plate;

[0030] One end of the impact spring is fixed inside the outer casing on the other side, and the other end is fixed to the impact plate.

[0031] The impact excitation coil is wound inside the cavity of the outer casing, and the impact excitation coil is provided with an AC power conductor and a second sealing gasket.

[0032] Furthermore, the impact magnetized shape memory alloy spring is made of Ni-Mn-Ga material, with a maximum strain of 6% to 10%;

[0033] The AC conductor is connected to AC power, causing the impulse excitation coil to generate an alternating magnetic field;

[0034] The impact particles are disposed between the impact magnetized shape memory alloy spring and the impact spring;

[0035] The impact oscillator has a cylindrical structure with its center of gravity not located at the geometric center, in order to improve the nonlinear motion capability of the impact oscillator.

[0036] Furthermore, the self-resetting assembly also includes a limiting plate, which is fixed to one end of the fixed cylinder and is fixedly connected to the piston rod;

[0037] The magnetic component includes a reset excitation coil and an annular magnet. The fixed cylinder includes an inner layer and an outer layer. The reset excitation coil is wound on the inner layer, and the annular magnet is disposed on the outer layer.

[0038] Furthermore, the spring is a magnetically controlled shape memory alloy spring, one end of which is fixed to the bottom of the fixed cylinder and the other end is fixed to the limiting plate. The magnetically controlled shape memory alloy spring is made of Ni-Mn-Ga material and has a maximum strain of 6% to 10%.

[0039] Furthermore, one end of the rocker spring is fixed to the piston top cover;

[0040] The sealing conduit is a rubber-insulated steel wire conduit.

[0041] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0042] 1. This invention effectively improves the damping effect of the damper by setting a double piston structure.

[0043] 2. By setting up a mechanical anti-settling component, the present invention can achieve excellent anti-settling function of magnetorheological fluid even in the absence of passive input.

[0044] 3. This invention actively achieves the anti-settling function of magnetorheological fluid by setting an impact-controlled shape memory alloy spring.

[0045] 4. This invention achieves the self-resetting function of the damper by setting a magnetically controlled shape memory alloy spring.

[0046] 5. This invention can actively control the damping force of the magnetorheological fluid by adjusting the current flow according to the demand, so as to realize the semi-active control of the damper. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of a magnetorheological damper that prevents sedimentation and has self-resetting properties.

[0048] Figure 2 A schematic diagram of the external shape of a magnetorheological damper that is anti-settling and self-resetting;

[0049] Figure 3 This is a schematic diagram showing the fixed position of the fixing ring in Example 1;

[0050] Figure 4 This is a schematic diagram of the main internal structure of a magnetorheological damper that is resistant to sedimentation and self-resetting.

[0051] Figure 5 This is an enlarged view of the structure at the fixing ring in Example 1;

[0052] Figure 6 This is a schematic diagram of the installation of the retaining ring and bearing in Example 1;

[0053] Figure 7 This is a schematic diagram of the spiral guide plate in Example 1;

[0054] Figure 8 This is a schematic diagram of the internal structure of the impact oscillator in Example 1;

[0055] Figure 9 This is a cross-sectional view of the fixed cylinder in Example 1.

[0056] Figure 1 Explanation of Chinese markings:

[0057] 1-Cavity, 2-Pull rod, 3-Piston top cover, 4-Piston wall, 5-Piston bottom cover, 6-Excitation coil, 7-Fixing screw, 8-Piston rod, 9-Wire hole, 10-Spiral guide plate, 11-Fixing ring, 12-Bearing, 13-Spiral gear, 14-Spiral blade, 15-Impact oscillator, 16-Swing spring, 17-Sealing conduit, 18-Magnetorheological fluid, 19-Air baffle, 20-Air, 21-Fixing cylinder, 22-Magnetically controlled shape memory alloy spring, 23-Reset excitation coil, 24-Ring magnet, 25-Limiting plate, 26-DC wire, 27-First sealing gasket;

[0058] Figure 2 Explanation of Chinese markings:

[0059] 1-Cavity, 2-Pull rod, 8-Piston rod, 21-Fixed cylinder, 25-Limiting plate;

[0060] Figure 3 Explanation of Chinese markings:

[0061] 1-Cavity, 11-Fixing ring;

[0062] Figure 4 Explanation of Chinese markings:

[0063] 3-Piston top cover, 4-Piston wall, 5-Piston bottom cover, 8-Piston rod, 10-Helical guide plate, 11-Fixing ring, 13-Helical gear, 14-Helical blade, 15-Impact oscillator, 16-Swing spring, 17-Sealing conduit;

[0064] Figure 5 Explanation of Chinese markings:

[0065] 11-Fixing ring, 13-Helical gear, 14-Helical blade;

[0066] Figure 6 Explanation of Chinese markings:

[0067] 11-Retaining ring, 12-Bearing;

[0068] Figure 7 Explanation of Chinese markings:

[0069] 10- Spiral guide plate;

[0070] Figure 8 Explanation of Chinese markings:

[0071] 28-Outer shell, 29-Impact excitation coil, 30-Impact magnetically controlled shape memory alloy spring, 31-Impact spring, 32-Impact plate, 33-Impact particles, 34-AC wire, 35-Second sealing gasket;

[0072] Figure 9 Explanation of Chinese markings:

[0073] 21-Fixed cylinder. Detailed Implementation

[0074] The following examples illustrate specific implementations of the present invention. These examples are carried out based on the solution described in the present invention, and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following examples.

[0075] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Component models, material names, connection structures, and other features not explicitly described in this technical solution are considered common technical features disclosed in the prior art.

[0076] Example 1

[0077] This embodiment provides a magnetorheological damper with anti-settling and self-resetting capabilities, including a dual-piston assembly, a mechanical anti-settling assembly, an active anti-settling assembly, and a self-resetting assembly. Figure 1 As shown, Figure 2 The external shape of a magnetorheological damper that is anti-settling and self-resetting.

[0078] The dual-piston assembly includes a cavity 1, a pull rod 2, a piston head, a piston rod 8, a wire hole 9, an air baffle 19, air 20, a DC power wire 26, and a first sealing gasket 27. The pull rod 2 is fixed to one end of the cavity 1, and the piston head is fixed inside the cavity 1. The wire hole 9 is located on the piston rod 8 and is used to install the DC power wire 26. The first sealing gasket 27 and the air baffle 19 are sequentially fixed inside the cavity 1, and are located on the side closest to the pull rod 2; the space enclosed by the first sealing gasket 27 and the cavity 1 is filled with the air 20, and the space enclosed by the air baffle 19 and the other side of the cavity 1 is filled with magnetorheological fluid 18. The piston rod 8 passes sequentially through the piston head, the through hole in the center of the retaining ring 11, and the hole on the limiting plate 25, and is fixed to the piston head by the fixing screw 7. The piston head includes a piston top cover 3, a piston wall 4, a piston bottom cover 5, and an excitation coil 6. The piston rod 8 connects the two piston heads to form a double piston structure. The excitation coil 6 is fixed to the piston wall 4 inside the piston head. The piston top cover 3, piston wall 4, and piston bottom cover 5 are all sealed to prevent the magnetorheological fluid 18 from seeping into the interior of the piston head.

[0079] Figure 4 This is a schematic diagram of the main internal structure of a magnetorheological damper with anti-settling and self-resetting properties. The mechanical anti-settling assembly includes a spiral guide plate 10, a fixing ring 11, a bearing 12, a spiral gear 13, and a spiral blade 14. The entire mechanical anti-settling assembly is fixed inside the cavity 1. The fixing ring 11 is fixed inside the cavity 1, specifically in the middle of the section of the cavity 1 where the magnetorheological fluid 18 is placed. Figure 3 The fixed position of the retaining ring 11 within the cavity 1 is shown. For example... Figure 5 and Figure 6 As shown, the inner ring of bearing 12 is fixed to the fixing ring 11, the helical gear 13 is fixed to the outer ring of bearing 12, and the helical blade 14 is fixed to the helical gear 13.

[0080] Four spiral guide plates 10 are provided in total, and the sector angle corresponding to the four spiral guide plates 10 is 60°. Figure 7As shown, two spiral guide plates 10 are fixed to the piston bottom cover 5 of one piston head, and two other spiral guide plates 10 are fixed to the piston top cover 3 of another piston head. Both spiral guide plates 10 are symmetrical about the center. When the double piston structure is symmetrically positioned on both sides of the fixed ring 11, the length of the four spiral guide plates 10 can pass through the fixed ring 11 to ensure that the helical gear 13 can always mesh with the four or two spiral guide plates 10 when the damper is working. The angle between the edges of two adjacent spiral guide plates 10 is 30°; the spiral direction of the spiral guide plates 10 and the helical gear 13 is the same. The fixed ring 11 has a through hole in the center to allow the piston rod 8 to pass through, and a groove on its outer side to allow the spiral guide plates 10 to pass through and to allow the magnetorheological fluid 18 to flow.

[0081] The active anti-settlement component includes a rocking spring 16, a sealing conduit 17, and an impact oscillator 15 connected in sequence. Figure 8 This is a schematic diagram of the internal structure of an impact oscillator, as shown below. Figure 8 As shown, the impact oscillator 15 includes a housing 28, a second sealing gasket 35, an impact excitation coil 29, an impact magnetically controlled shape memory alloy spring 30, an impact spring 31, an impact plate 32, impact particles 33, and an AC power conductor 34. One end of the impact magnetically controlled shape memory alloy spring 30 is fixed to one side inside the housing 28, and the other end is fixed to the impact plate 32; one end of the impact spring 31 is fixed to the other side inside the housing 28, and the other end is fixed to the impact plate 32.

[0082] The impact excitation coil 29 is wound around the cavity of the outer casing 28. The impact excitation coil 29 is equipped with an AC power conductor 34 and a second sealing gasket 35. The impact magnetically controlled shape memory alloy spring 30 is made of Ni-Mn-Ga material, with a maximum strain of 6% to 10%. Ni-Mn-Ga material is existing technology and is commercially available, so it will not be described further. The AC power conductor 34 is connected to AC power, causing the impact excitation coil 29 to generate an alternating magnetic field. The impact particles 33 are located between the impact magnetically controlled shape memory alloy spring 30 and the impact spring 31. The impact oscillator 15 has a cylindrical structure with its center of gravity not located at the geometric center to improve its nonlinear motion capability. One end of the rocking spring 16 is fixed to the piston top cover 3 of a piston head, and the other end is fixed to the outer casing 28. The sealing conduit 17 is a rubber-steel wire tube. Figure 8 The internal structure of the shock oscillator 15 is shown.

[0083] The self-resetting assembly includes a fixed cylinder 21, a magnetically controlled shape memory alloy spring 22, a limiting plate 25, a reset excitation coil 23, a ring magnet 24, and a sealing gasket 27. The limiting plate 25 is fixedly connected to the piston rod 8, and the distance between the fixed position and the end of the cavity 1 is the safe movement distance of the piston rod 8.

[0084] One end of the magnetically controlled shape memory alloy spring 22 is fixed to the bottom of the fixed cylinder 21, and the other end is fixed to the limiting plate 25. It is made of Ni-Mn-Ga material, and its maximum strain is 6%–10%. The magnetically controlled shape memory alloy spring 22 is pre-existing in a martensitic phase transformation state under the magnetic field of the ring magnet 24, but has not reached its maximum strain, thus ensuring that the magnetically controlled shape memory alloy spring 22 has a certain degree of restoring capability. The magnetization direction of the ring magnet 24 is axial, ensuring that its internal magnetic field direction is along the axial direction of the magnetically controlled shape memory alloy spring 22.

[0085] The fixed cylinder 21 is provided with two partitions, such as Figure 9 As shown, the inner layer has a reset excitation coil 23 wound around it, and the outer layer has a ring magnet 24. The top of the fixed cylinder 21 has a circular hole to guide the DC current wire 26 to the outside. The inside of the fixed cylinder 21 has fan-shaped openings around its perimeter, exposing the reset excitation coil 23 and the ring magnet 24. Figure 9 The cross-sectional structure of the fixed cylinder 21 is shown.

[0086] When the structure vibrates, the tie rod 2 pulls the piston rod axially, and the magnetorheological fluid flows and shears at both piston heads, consuming energy. The axial movement of the spiral guide plate 10 causes the spiral gear 13 to reciprocate, which in turn drives the spiral blade 14 to rotate, stirring the magnetorheological fluid 18 and improving the sedimentation problem of the magnetorheological fluid 18. The impact oscillator 15 can be actively connected to AC power, and the impact magnetically controlled shape memory alloy spring 30 expands and contracts with the alternating magnetic field, pushing the impact particles 33 to collide with the impact plate 32, thereby impacting the oscillator 15 to oscillate the magnetorheological fluid 18 and actively improving the sedimentation problem of the magnetorheological fluid. The self-reset function is achieved by actively controlling the current of the reset excitation coil 23, controlling the magnetic field strength after the electromagnetic induction magnetic field and the magnetic field of the ring magnet 24 are superimposed, so that the magnetically controlled shape memory alloy spring 22 produces different sizes of deformation, realizing the self-reset function.

[0087] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A magnetorheological damper with anti-settling and self-resetting properties, characterized in that, Includes dual-piston assemblies, mechanical anti-settlement assemblies, active anti-settlement assemblies, and self-resetting assemblies; The dual piston assembly includes a cavity (1), a pull rod (2) and a piston component. The pull rod (2) is fixed to one end of the cavity, and the piston component is fixed inside the cavity. The cavity (1) is filled with magnetorheological fluid (18). The mechanical anti-settlement assembly includes a spiral component, a fixing ring (11) and a bearing (12). The inner ring of the bearing (12) is fixed to the fixing ring (11), and the spiral component is fixed to the outer ring of the bearing (12). The mechanical anti-settlement assembly is fixed inside the cavity (1); The active anti-settlement assembly includes a rocking spring (16), a sealing conduit (17), and an impact oscillator (15) connected in sequence; the active anti-settlement assembly is fixed to the piston component; The self-resetting assembly includes a fixed cylinder (21), a magnetically controlled shape memory alloy spring (22), and a magnetic component; the magnetically controlled shape memory alloy spring (22) and the magnetic component are both fixed inside the fixed cylinder (21); the self-resetting assembly is connected to the dual-piston assembly; The impact oscillator (15) includes a housing (28), an impact excitation coil (29), an impact magnetically controlled shape memory alloy spring (30), an impact spring (31), an impact plate (32), impact particles (33), and an AC power conductor (34). When the damper vibrates, the pull rod (2) pulls the piston component to move axially, causing the helical gear (13) to rotate, which in turn causes the helical blades (14) to stir the magnetorheological fluid (18). At the same time, the impact oscillator (15) impacts the impact magnetically controlled shape memory alloy spring (30), causing the impact magnetically controlled shape memory alloy spring (30) to expand and contract with the alternating magnetic field, which in turn causes the impact oscillator (15) to oscillate the magnetorheological fluid (18), thus actively improving the precipitation problem of the magnetorheological fluid (18). By actively controlling the current of the magnetic component, the magnetically controlled shape memory alloy spring (22) produces different sizes of deformation, realizing the self-resetting function. One end of the impact magnetized shape memory alloy spring (30) is fixed to one side inside the outer shell (28), and the other end is fixed to the impact plate (32). One end of the impact spring (31) is fixed inside the outer casing (28) on the other side, and the other end is fixed to the impact plate (32). The impact excitation coil (29) is wound inside the cavity of the outer shell (28), and the impact excitation coil (29) is provided with an AC wire (34) and a second sealing gasket (35).

2. The magnetorheological damper for preventing sedimentation and self-resetting according to claim 1, characterized in that, The dual-piston assembly also includes a wire hole (9), an air septum (19), a DC wire (26), and a first sealing gasket (27). The wire hole (9) is provided on the piston component for installing the DC wire (26), and the DC wire (26) is used to provide the electric power required for the excitation coil (6) and the reset excitation coil (23) to generate the magnetic field; The first sealing gasket (27) and the air baffle (19) are fixed in sequence inside the cavity (1) and are both close to one side of the pull rod (2). The space enclosed by the first sealing gasket (27) and the cavity (1) is filled with air (20).

3. The magnetorheological damper with anti-settling and self-resetting properties according to claim 2, characterized in that, The piston component includes two piston heads and a piston rod (8), the piston rod (8) connecting the two piston heads to form a double piston structure; The piston rod (8) passes through the piston head, the through hole in the center of the retaining ring (11), and the self-resetting assembly in sequence, and the piston head is fixed by the fixing screw (7); The piston head includes a piston top cover (3), a piston wall (4), a piston bottom cover (5), and an excitation coil (6); the excitation coil (6) is fixed to the piston wall (4) inside the piston head; The piston top cover (3), piston wall (4) and piston bottom cover (5) are all sealed to prevent the magnetorheological fluid (18) from seeping into the piston head.

4. The magnetorheological damper for preventing sedimentation and self-resetting according to claim 1, characterized in that, The spiral component includes a spiral guide plate (10), a spiral gear (13), and a spiral blade (14). The helical gear (13) is fixed on the outer ring of the bearing (12), and the helical blade (14) is fixed on the helical gear (13); The spiral guide plate (10) is provided in a total of four pieces. The sector angle corresponding to the four spiral guide plates (10) is 60°. Two spiral guide plates (10) are fixed on the piston bottom cover (5) of one piston head, and two spiral guide plates (10) are fixed on the piston top cover (3) of another piston head. Both spiral guide plates (10) are symmetrical about the center.

5. A magnetorheological damper with anti-settling and self-resetting properties according to claim 4, characterized in that, The four spiral guide plates (10) pass through the slots on the outside of the fixing ring (11) to ensure that the spiral gear (13) meshes with the spiral guide plates (10) in the working state; The angle between the edges of two adjacent spiral guide plates (10) is 30°; The spiral guide plate (10) has the same spiral direction as the spiral gear (13).

6. A magnetorheological damper with anti-settling and self-resetting properties according to claim 1, characterized in that, The impact magnetized shape memory alloy spring (30) is made of Ni-Mn-Ga material, with a maximum strain of 6%~10%; The AC conductor (34) is connected to AC power, causing the impulse excitation coil (29) to generate an alternating magnetic field; The impact particle (33) is disposed between the impact magnetized shape memory alloy spring (30) and the impact spring (31); The impact oscillator (15) has a cylindrical structure and its center of gravity is not located at the geometric center, so as to improve the nonlinear motion capability of the impact oscillator (15).

7. A magnetorheological damper with anti-settling and self-resetting properties according to claim 3, characterized in that, The self-resetting assembly also includes a limiting plate (25), which is fixed to one end of the fixed cylinder (21) and is fixedly connected to the piston rod (8); The magnetic components include a reset excitation coil (23) and an annular magnet (24). The fixed cylinder (21) includes an inner layer and an outer layer. The reset excitation coil (23) is wound on the inner layer, and the annular magnet (24) is disposed on the outer layer.

8. A magnetorheological damper with anti-settling and self-resetting properties according to claim 1, characterized in that, One end of the magnetically controlled shape memory alloy spring (22) is fixed to the bottom of the fixed cylinder (21), and the other end is fixed to the limiting plate (25). The magnetically controlled shape memory alloy spring (22) is made of Ni-Mn-Ga material and has a maximum strain of 6%~10%.

9. A magnetorheological damper with anti-settling and self-resetting properties according to claim 3, characterized in that, One end of the rocking spring (16) is fixed to the piston top cover (3); The sealing conduit (17) is a rubber steel wire conduit.

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