Magnetorheological fluid damper

Abstract

The utility model provides a magnetorheological fluid damper, which belongs to the technical field of dampers, and comprises a shell, magnetorheological fluid, a plurality of magnetic parts, a plurality of elastic elements, a plurality of elastic elements, a plurality of elastic elements and a plurality of elastic elements, the rotating rod is rotationally arranged in the shell, the extending end of the rotating rod is rotationally connected with the shell through a thread structure, and when the rotating rod is subjected to axial force, the rotating rod can rotate on the shell through the thread structure; the detection piece is arranged on the shell, the rotating rod is matched with the detection piece, and when the rotating rod axially moves relative to the shell to abut against the detection piece, the detection piece can generate an optical signal according to the abutting pressure of the rotating rod; according to the utility model, when the rotating rod abuts against the detection piece, the detection piece generates an optical signal, so that the stress condition of the rotating rod at the moment can be calculated according to the abutting pressure recorded by the detection piece, the working state of the damper under the vibration condition is recorded, and whether the damper is in a healthy qualified state or not is judged after vibration.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic flow dampers, in particular to a magnetorheological fluid damper. Background Art

[0002] The magnetorheological fluid damper is an instrument used for shockproofing. When in use, it relies on the damping force of the magnetorheological fluid for shock absorption. Magnetorheological fluid (MR fluid for short) is a new type of fluid with controllable fluidity. It exhibits low-viscosity Newtonian fluid properties when there is no external magnetic field, and exhibits high-viscosity, low-fluidity Bingham fluid when there is an external magnetic field. There is a corresponding relationship between the viscosity of the liquid and the magnetic flux.

[0003] Chinese patent document CN108278320A discloses a magnetorheological damper composite working mode high output method and damper, the damper piston rod is provided with a screw thread, the screw thread and the ball nut pair on the cylinder body cooperate. When the piston rod moves linearly relative to the cylinder body under the action of external load, the ball nut pair causes the piston rod to produce rotational motion around its own axis, and at the same time drives the piston to produce linear motion relative to the cylinder body and rotational motion around its own axis.

[0004] However, the damper in the prior art has no device for detecting the pressure on the piston rod, which makes it impossible to analyze the stress on the piston rod during the operation of the damper and determine the health of the damper. Utility Model Content

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the damper in the prior art cannot judge the health condition during use, thereby providing a magnetorheological fluid damper.

[0006] In order to solve the above technical problems, the utility model provides a magnetorheological fluid damper, comprising: a shell, in which magnetorheological fluid is arranged, and a plurality of magnetic parts are arranged on the inner wall of the shell;

[0007] A rotating rod, rotatably disposed in the housing, the rotating rod having at least one end extending out of the housing, the extending end of the rotating rod being rotatably connected to the housing via a threaded structure, and when the rotating rod is subjected to an axial force, the rotating rod can rotate on the housing via the threaded structure;

[0008] A sensing device, arranged on the rotating rod, the sensing device rotates with the rotating rod in the housing, and the sensing device cooperates with the magnetic member during the rotation process to change the viscosity of the magnetorheological fluid;

[0009] A detection member is arranged on the shell, and both ends of the rotating rod extend out of the shell, namely a first extending end and a second extending end, the first extending end is used to connect with the damping member, and the second extending end is used to cooperate with the detection member, the detection member and the second extending end of the rotating rod are spaced apart, and when the rotating rod moves axially relative to the shell to abut against the detection member, the detection member can generate a light signal according to the abutting pressure of the rotating rod.

[0010] Preferably, the induction device comprises: an electromagnetic plate, a plurality of blade groups and a coil wound on the blade groups, the electromagnetic plate is arranged on the inner wall of the shell, the coil is electrically connected to the electromagnetic plate, and the coil is located in the magnetorheological fluid.

[0011] Preferably, each of the blade groups comprises: a plurality of blades arranged in a circumferential array along the rotating rod, and the coils are evenly wound around the blades.

[0012] Preferably, a plurality of through holes are provided on the blade.

[0013] Preferably, the magnetic member is connected to the inner wall of the shell through an elastic member.

[0014] Preferably, the housing is provided with a sleeve sleeved outside the rotating rod near the second extended end of the rotating rod, and a detection component for detecting the rotation speed of the rotating rod is arranged in the sleeve.

[0015] Preferably, the detection assembly comprises: a first electrode plate and a second electrode plate, the first electrode plate and the second electrode plate are respectively frictionally matched with the rotating rod, and when the rotating rod rotates, the first electrode plate and the second electrode plate generate electrical signals.

[0016] Preferably, the detection member is detachably mounted on one end of the sleeve.

[0017] Preferably, the detection member comprises a connecting rod and a piezoelectric ceramic arranged at an end of the connecting rod, and a portion of the connecting rod is inserted into the sleeve and locked with the sleeve by a fastener.

[0018] Preferably, a bearing member is mounted on the first protruding end of the rotating rod, and the rotating rod is connected to the member to be damped via the bearing member.

[0019] The technical solution of the utility model has the following advantages:

[0020] 1. In the magnetorheological fluid damper provided by the utility model, a rotating rod and a shell are connected by a threaded structure. When the rotating rod is subjected to an axial force, the rotating rod rotates through the threaded structure, and the axial movement brought by the structure can be converted into rotation, thereby increasing the area of ​​the blades contacting the magnetorheological fluid and the rotational displacement, and improving its damping force as a viscous damper; when the rotating rod abuts against the detection member, the detection member generates a light signal, and at this time, the force condition of the rotating rod at this time can be calculated based on the abutment pressure recorded by the detection member, and the working state of the damping under vibration can be recorded, so as to judge whether the damper is in a healthy and qualified state after the vibration.

[0021] 2. The magnetorheological fluid damper provided by the utility model has the following characteristics: when the rotating rod rotates, the coil cuts the magnetic flux lines of the magnetic part to generate current in the coil, and the current generates a strong magnetic field through the electromagnetic plate. The strong magnetic field acts on the magnetorheological fluid, increasing the ability to adsorb metal particles, changing the density of the magnetorheological fluid around the blades, increasing the viscosity of the magnetorheological fluid, and thus increasing the damping force.

[0022] 3. The magnetorheological fluid damper provided by the utility model, when the rotating rod rotates, the blades will stir the magnetorheological fluid, and part of the magnetorheological fluid will pass through the through hole. According to the movement of the fluid, throttling resistance will be generated when the fluid passes through the throttling hole, that is, when the magnetorheological fluid passes through the through hole, the damping effect of the magnetorheological fluid will be increased, thereby greatly improving the damping force generated by the damper. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A front view of a magnetorheological fluid damper provided in one embodiment of the utility model;

[0025] Figure 2 for Figure 1 A front view of the rotating rod in the embodiment of the present invention cooperating with the detection member, the first electrode plate and the second electrode plate;

[0026] Figure 3 for Figure 1 Flow chart of the magnetorheological fluid damper in working state.

[0027] Description of reference numerals:

[0028] 1. Shell; 2. Magnetorheological fluid; 3. Connecting rod; 4. Magnetic part; 5. Rotating rod; 6. Bearing part; 7. Detection part; 8. First electrode plate; 9. Second electrode plate; 10. Coil; 11. Blade; 12. Electromagnetic plate; 13. Electricity storage device; 14. Elastic part; 15. Strain gauge; 16. Casing. DETAILED DESCRIPTION

[0029] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] The magnetorheological fluid damper provided in this embodiment is used to provide shock absorption in the fields of automobile suspension, building structure shock absorption, etc.

[0034] like Figure 1 , Figure 2As shown, a specific implementation of the magnetorheological fluid damper provided in this embodiment includes: a housing 1, a rotating rod 5, a detection member 7 and an induction device. The housing 1 is filled with magnetorheological fluid 2. A connecting rod 3 for connecting to the outside is provided at one axial end of the housing 1, and a plurality of magnetic members 4 are installed on the inner wall of the housing 1; a threaded hole is provided on the housing 1, and the rotating rod 5 is threadedly connected to the housing 1, which can convert the axial movement brought by the structure into rotation, increase the area and rotational displacement of the blade contacting the magnetorheological fluid, and improve its damping force as a viscous damper. When one end of the rotating rod 5 is subjected to an axial force, the rotating rod 5 can rotate circumferentially through the threaded structure. The induction device is arranged on the rotating rod 5, and when the rotating rod 5 rotates, the induction device is driven to rotate around the rotating rod 5, so that the induction device cuts the magnetic flux generated by the magnetic member 4, thereby generating a current to increase the magnetic field strength, change the viscosity of the magnetorheological fluid 2, and thus increase the damping effect. The detection member 7 is arranged on the housing 1, and the first extended end of the rotating rod 5 is connected to the damping member to be installed, that is, the device to be installed with the damper. The second end of the rotating rod 5 is spaced apart from the detection member 7, and when the rotating rod 5 rotates axially, the rotating rod 5 also moves axially toward the detection member 7. When the rotating rod 5 abuts against the detection member 7, the detection member 7 generates a light signal, and the force condition of the rotating rod 5 at this time can be calculated based on the abutment pressure recorded by the detection member 7, and the working state of the damping under vibration can be recorded, and whether the damper is in a healthy and qualified state after the vibration can be judged.

[0035] Among them, the detection member 7 is a piezoelectric ceramic. The magnetorheological fluid 2 is a prior art, and the magnetorheological fluid is a mixture of liquid crystal polymer and glass particles wrapped with nickel and titanium dioxide. In the absence of an external magnetic field, the magnetorheological fluid 2 presents the characteristics of a low-viscosity fluid; when there is an external magnetic field, the viscosity and yield stress of the magnetorheological fluid 2 will increase significantly, showing the characteristics of high viscosity and low fluidity. Specifically, a strain gauge 15 is provided at the end of the rotating rod 5, and the strain gauge 15 is in contact with the detection member 7. The axial movement of the rotating rod 5 is converted into circumferential rotation by the bearing member 6, so that the coil 10 is driven to rotate when the rotating rod 5 rotates circumferentially, thereby cutting the magnetic flux lines and generating current. When the rotating rod 5 rotates circumferentially, the first electrode plate 8 and the second electrode plate 9 are rubbed with electrical signals, and the axial movement of the rotating rod 5 generates optical signals. By statistically analyzing the signals, the structure can be monitored in real time. In addition, a grating can be provided at the end of the rotating rod 5, and the grating is in contact with the detection member 7. In addition, the detection member 7 can also be a ceramic pressure sensor.

[0036] like Figure 1As shown, in this embodiment, the induction device includes: an electromagnetic plate 12, a plurality of blade groups and a coil 10 wound on the blade group, and the electromagnetic plate 12 is connected to the coil 10 on the blade group through an electric wire. Among them, the coil 10 is located in the magnetorheological fluid 2. When the rotating rod 5 rotates, the coil 10 cuts the magnetic flux of the magnetic member 4 to generate current in the coil 10, and the current will generate a strong magnetic field through the electromagnetic plate 12. The strong magnetic field acts on the magnetorheological fluid 2, so that the viscosity of the magnetorheological fluid 2 increases, thereby increasing the damping force. When the rotation speed is different, the current intensity generated by the coil 10 is different, and the magnetic field intensity generated by the electromagnetic plate 12 is also different; in general, the faster the rotation speed, the stronger the current, and thus the higher the damping effect, and vice versa, the slower the rotation speed, the lower the damping effect. But when the coil 10 is powered off, the magnetic field generated by the electromagnetic plate 12 disappears, and the damper returns to a low damping state. In addition, as an alternative embodiment, the induction device may also include: a controller, which is connected to the coil 10 through the controller. When the coil 10 rotates to generate current, the controller controls the magnitude of the current and actively adjusts the magnitude of the current.

[0037] like Figure 1 As shown, in this embodiment, a plurality of blade groups are arranged at intervals along the axial direction of the rotating rod 5, and each blade group is provided with a plurality of blades 11 in a circumferential array along the rotating rod 5, and the coil 10 is evenly wound on the blade 11. That is, when the rotating rod 5 rotates, the coil 10 on the blade 11 cuts the magnetic flux lines to generate current, changes the density of the magnetorheological fluid 2 around the blade 11, and thus increases the damping force. In addition, as an alternative embodiment, the blade group can also be provided in only one group, arranged in a circumferential array.

[0038] like Figure 1 As shown, in this embodiment, a plurality of through holes are provided on the blade 11. When the rotating rod 5 rotates, the blade 11 will stir the magnetorheological fluid 2, and part of the magnetorheological fluid 2 will pass through the through holes. According to the fluid movement, when the fluid passes through the throttling hole, throttling resistance will be generated, that is, when the magnetorheological fluid 2 passes through the through hole, the damping effect of the magnetorheological fluid 2 will be increased, thereby greatly improving the damping force generated by the damper. In addition, as an alternative embodiment, the blade 11 may not be provided with a through hole, and the coil 10 can also cut the magnetic flux lines.

[0039] In addition, a power storage device 13 can be provided outside the housing 1. The power storage device 13 is electrically connected to the electromagnetic plate 12. The power storage device 13 is connected to the electromagnetic plate 12. The power storage device 13 can discharge to the outside. After being connected to the electromagnetic plate 12, the magnetic force of the electromagnetic plate 12 can be adjusted, thereby increasing the damping of the magnetorheological fluid 2 at the blade 11, increasing the damping force of the damper, and increasing the shock absorption effect. The power storage device 13 is a lithium battery. In addition, the power storage device 13 can also be a storage battery.

[0040] like Figure 1As shown, in this embodiment, the magnetic part 4 is connected to the inner wall of the shell 1 through the elastic part 14, the elastic part 14 is a spring, the magnetic part 4 is a magnet, and includes four groups of N and S electrodes. When the viscosity of the magnetorheological fluid 2 is changed, the magnetic part 4 can move slightly under the action of the elastic part 14. When the magnetorheological fluid 2 returns to normal, the magnetic part 4 returns to its original state under the action of the elastic part 14, so that. An N electrode and an S electrode are provided at both axial ends of the shell 1. The N electrode and the S electrode are closely arranged, and the N electrode is located on the inner side. The N electrode and the S electrode are connected to an elastic part 14 in the radial direction of the shell 1, and the S electrode is also connected to an elastic part 14 along the axial direction of the shell 1. In addition, as a replaceable embodiment, the elastic part 14 is a shock absorber. In addition, as a replaceable embodiment, the elastic part 14 is a tension spring.

[0041] like Figure 1 As shown, in this embodiment, the second protruding end of the rotating rod 5 near the housing 1 has a sleeve 16 sleeved outside the rotating rod 5. The sleeve 16 is arranged at the end of the housing 1 and extends outward. The sleeve 16 is the same as the axis of the housing 1, that is, the sleeve 16 is concentric with the housing 1, and the diameter of the sleeve 16 is smaller than the diameter of the housing 1. The second end of the rotating rod 5 is arranged in the sleeve 16, and the detection component is also arranged in the sleeve 16. The sleeve 16 provides an independent rotation space for the rotating rod 5, isolates the second end of the rotating rod 5 from other parts of the housing 1, so that the sleeve 16 can provide a certain protection for the rotating rod 5; at the same time, the diameter of the sleeve 16 is smaller than the diameter of the housing 1, and the rotating rod 5 has a more stable and accurate rotation environment when rotating in the sleeve 16. The detection component can also detect the rotation state of the rotating rod. In addition, as an alternative embodiment, the sleeve 16 may not be provided, and the detection component is arranged in the housing 1, which can also realize the working process between the rotating rod 5 and the detection component. In addition, as an alternative implementation, the sleeve 16 can be a round tube or a square tube.

[0042] like Figure 2As shown, in this embodiment, the detection component includes: a first electrode plate 8 and a second electrode plate 9, the first electrode plate 8 and the second electrode plate 9 are respectively frictionally matched with the rotating rod 5, and when the rotating rod 5 rotates, the first electrode plate 8 and the second electrode plate 9 generate electrical signals. Among them, an aluminum foil coating is provided on the rotating rod 5, and the material of the first electrode plate 8 and the second electrode plate 9 is a teflon material. When the rotating rod 5 rotates, the aluminum foil coating rubs against the first electrode plate 8 and the second electrode plate 9. Since the faster the friction, the larger the contact area, the faster the charge rises, so the data detection industrial control instrument detects according to the electrical signals of the first electrode plate 8 and the second electrode plate 9, and obtains the moving distance and rotation speed of the rotating rod 5, thereby improving the structural state monitoring of the rotating rod 5. In addition, as a replaceable embodiment, the detection component can be provided with only one electrode plate, and the state monitoring of the rotating rod 5 can also be achieved by rubbing one electrode plate with the rotating rod 5. In addition, as a replaceable embodiment, the outer end surface of the rotating rod 5 can also be provided with a fiber coating or a polyamide coating. In addition, as an alternative embodiment, the material of the first electrode plate 8 and the second electrode plate 9 may also be polyisobutylene or polyurethane.

[0043] like Figure 2 As shown, in this embodiment, the detection member 7 is detachably mounted on one end of the sleeve 16. When the rotating rod 5 rotates too fast and exceeds the larger pressure that the detection member 7 can withstand, the detection member 7 is easily damaged. The detection member 7 can be easily replaced by being arranged at one end of the sleeve 16, thereby reducing the use cost. In addition, as a replaceable embodiment, the detection member 7 can also be fixedly arranged in the sleeve 16. When the detection member 7 is damaged, the entire damper can be replaced.

[0044] like Figure 2 As shown, in this embodiment, the detection member 7 includes a connecting rod 3 and a piezoelectric ceramic. The piezoelectric ceramic is arranged at the end of the connecting rod 3. A portion of the connecting rod 3 is inserted into the sleeve 16 and is locked with the sleeve 16 by a fastener. Among them, the fastener is a bolt. During installation, a portion of the connecting rod 3 is inserted into the interior of the sleeve 16, and the bolt passes through the sleeve 16 radially and is threadedly connected to the connecting rod 3. At this time, there is a certain distance between the piezoelectric ceramic at the end of the connecting rod 3 and the end of the rotating rod 5 in the non-working state. During disassembly, the bolt is removed, the connecting rod 3 is taken out, and the piezoelectric ceramic can be replaced. In addition, as a replaceable embodiment, the detection member 7 can only be provided with piezoelectric ceramics. In addition, as a replaceable embodiment, the detection member 7 can also include: a connecting rod 3 and a ceramic pressure sensor.

[0045] like Figure 1As shown, in this embodiment, a bearing member 6 is installed at the first protruding end of the rotating rod 5, and the rotating rod 5 is connected to the member to be damped through the bearing member 6. The member to be damped can be a building, or other equipment that requires damping and shock absorption, such as a car. The bearing member 6 is a bearing, and the inner ring of the bearing is installed with the rotating rod 5, and the outer ring of the bearing is installed with the member to be damped, so that the member to be damped squeezes the rotating rod 5 during vibration, and the rotating rod 5 is connected to the member to be damped through the bearing member 6, so as to facilitate the rotation of the rotating rod 5. In addition, as a replaceable embodiment, the rotating rod 5 can be connected to the member to be damped through a pin, and the pin is inserted into the rotating rod 5 and the member to be damped respectively.

[0046] Installation method of magnetorheological fluid damper: The housing 1 is filled with magnetorheological fluid 2, and the two axial ends of the housing 1 are provided with two groups of magnetic parts 4, and the magnetic parts 4 are connected to the housing 1 through elastic parts 14. The rotating rod 5 is rotatably connected to the housing 1 through threads, and the first extended end of the rotating rod 5 is connected to the damping part through the bearing part 6, and the second extended end is matched with the detection part 7. When the rotating rod 5 is subjected to axial force, the rotating rod 5 can convert the axial moving force into circumferential rotation force through the threads, and the rotating rod 5 moves toward the detection part 7 while rotating. A plurality of blades 11 are arranged on the rotating rod 5 along the axial direction, and a coil 10 is wound on the blade 11, and there are also through holes on the blade 11. The coil 10 is connected to the electromagnetic plate 12, and the electromagnetic plate 12 is connected to the power storage device 13. The housing 1 is provided with a connecting rod 3 at one axial end, and the piezoelectric ceramic is arranged at the end of the connecting rod 3. There is a certain distance between the piezoelectric ceramic and the end of the rotating rod 5 in the initial state. A first electrode plate 8 and a second electrode plate 9 are provided on the sleeve 16 of the housing 1 , and the first electrode plate 8 and the second electrode plate 9 are in frictional contact with the outer end surface of the rotating rod 5 , respectively.

[0047] Working principle of magnetorheological fluid damper: Both ends of the damper are connected to the damped part respectively, and one end of the rotating rod 5 is connected to the damped part through a bearing. Figure 3As shown, when the rotating rod 5 is subjected to an axial external force, the rotating rod 5 is threadedly connected to the housing 1. At this time, the rotating rod 5 rotates due to the threaded connection with the housing 1 when subjected to axial force. When rotating, the rotating rod 5 moves toward the detection member 7. The circumferential rotation of the rotating rod 5 and the friction with the first electrode plate 8 and the second electrode plate 9 respectively generate positive and negative electrical signals, which are transmitted to the first signal transmitter. The displacement at this time can be calculated according to the difference of the electrical signals. The first signal transmitter is connected to the data acquisition industrial control instrument, and then the data acquisition industrial control instrument transmits the signal to the switch and connects to the remote Internet of Things communication system. A strain gauge 15 is provided at the end of the rotating rod 5. The axial movement of the rotating rod 5 will cause the strain gauge 15 of the rotating rod 5 to abut against the detection member 7. The detection member 7 collides with the strain gauge 15, generating an optical signal, which is transmitted to the second signal transmitter. The second signal transmitter is connected to the fiber optic Bragg grating regulator, and the fiber optic Bragg grating regulator is connected to the remote Internet of Things communication system. The remote IoT communication system analyzes the data from the fiber grating regulator and the data acquisition industrial control instrument for statistics, compares the data to analyze the structural stress, and realizes the health detection of the damper. Among them, the signal transmitter is an existing technology, which is a device that can generate, send and transmit radio frequency signals.

[0048] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the present utility model.

Claims

1. A magnetorheological fluid damper, characterized in that: include: A shell (1) having a magnetorheological fluid (2) disposed therein, and a plurality of magnetic parts (4) disposed on the inner wall of the shell (1); a rotating rod (5) rotatably arranged in the housing (1); the rotating rod (5) has at least one end extending out of the housing (1); the extending end of the rotating rod (5) is rotatably connected to the housing (1) via a threaded structure; when the rotating rod (5) is subjected to an axial force, the rotating rod (5) can be rotated on the housing (1) via the threaded structure; a sensing device, arranged on the rotating rod (5), the sensing device rotating with the rotating rod (5) in the housing (1), the sensing device cooperating with the magnetic member (4) during the rotation process to change the viscosity of the magnetorheological fluid (2); A detection member (7) is arranged on the housing (1); both ends of the rotating rod (5) extend out of the housing (1), namely a first extending end and a second extending end; the first extending end is used to connect with the damping member, and the second extending end is used to cooperate with the detection member (7); the detection member (7) and the second extending end of the rotating rod (5) are arranged at a distance; when the rotating rod (5) moves axially relative to the housing (1) to abut against the detection member (7), the detection member (7) can generate a light signal according to the abutting pressure of the rotating rod (5).

2. The magnetorheological fluid damper according to claim 1, characterized in that: The induction device comprises: an electromagnetic plate (12), a plurality of blade groups and a coil (10) wound around the blade group, the electromagnetic plate (12) being arranged on the inner wall of the shell (1), the coil (10) being electrically connected to the electromagnetic plate (12), and the coil (10) being located in the magnetorheological fluid (2).

3. The magnetorheological fluid damper according to claim 2, characterized in that: Each blade group comprises: a plurality of blades (11) arranged in a circumferential array along the rotating rod (5), and the coil (10) is evenly wound around the blades (11).

4. The magnetorheological fluid damper according to claim 3, characterized in that: The blade (11) is provided with a plurality of through holes.

5. The magnetorheological fluid damper according to claim 1, characterized in that: The magnetic member (4) is connected to the inner wall of the housing (1) via an elastic member (14).

6. The magnetorheological fluid damper according to any one of claims 1 to 5, characterized in that: The housing (1) has a sleeve (16) sleeved outside the rotating rod (5) at a second protruding end close to the rotating rod (5), and a detection component for detecting the rotation speed of the rotating rod (5) is arranged inside the sleeve (16).

7. The magnetorheological fluid damper according to claim 6, characterized in that: The detection component comprises: a first electrode plate (8) and a second electrode plate (9); the first electrode plate (8) and the second electrode plate (9) are respectively frictionally matched with the rotating rod (5); when the rotating rod (5) rotates, the first electrode plate (8) and the second electrode plate (9) generate electrical signals.

8. The magnetorheological fluid damper according to claim 6, characterized in that: The detection member (7) is detachably mounted on one end of the sleeve (16).

9. The magnetorheological fluid damper according to claim 8, characterized in that: The detection member (7) comprises a connecting rod (3) and a piezoelectric ceramic arranged at the end of the connecting rod (3); a portion of the connecting rod (3) is inserted into the sleeve (16) and is locked with the sleeve (16) by a fastener.

10. The magnetorheological fluid damper according to any one of claims 1 to 5, characterized in that: A bearing member (6) is mounted on the first protruding end of the rotating rod (5), and the rotating rod (5) is connected to the member to be damped via the bearing member (6).

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