Multi-degree-of-freedom magnetorheological vibration isolation device

Abstract

The multi-degree-of-freedom magneto-rheological vibration isolation device comprises a vibration isolation piece, a cylinder barrel and a driving piece, the vibration isolation piece is provided with an air bag part, the size of the air bag part is telescopic, the air bag part is provided with a vibration reduction cavity for containing a medium, a piston and a magneto-rheological valve are arranged in the cylinder barrel in a sliding mode, a coil is wound on the magneto-rheological valve, and damping force is generated after the coil is powered on; the piston and the magneto-rheological valve divide the cylinder barrel into a plurality of piston cavities, media are stored in the piston cavities, the media in the piston cavities and the media in the vibration reduction cavities communicate with each other, the driving piece is used for driving the piston to move, and the driving piece drives the piston to move so that the air bag part can expand or contract. A coil on the magneto-rheological valve is electrified to generate a magnetic field, magneto-rheological fluid presents the characteristics of high viscosity and low fluidity through magnetization of the magnetic field, damping force is provided for the whole device, a piston is pushed to extrude a piston cavity, a medium enters a vibration isolation cavity, the size and pressure of an air bag part are changed, and therefore the overall rigidity is changed. And the overall vibration reduction effect is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of vibration suppression, and in particular to a multi-degree-of-freedom magnetorheological vibration isolation device. Background Art

[0002] As mechanical equipment develops towards high speed and heavy load, strong vibration can easily lead to reduced accuracy or even structural damage. Therefore, vibration reduction devices are needed to reduce unnecessary mechanical vibrations in various types of machinery.

[0003] At present, vibration reduction devices mainly reduce the excitation effect. Reducing the excitation can reduce vibration. For example, the periodic inertial force generated by the imbalance of motors, high-speed rotating shafts, reciprocating connecting rods, pistons, etc. during movement is often the main source of forced vibration. Dynamic balancing of these moving parts can reduce vibration as required. The structure usually has multi-directional vibration. However, the above structure occupies a large area. It is difficult to suppress vibration in a limited space. Not only is the vibration reduction effect poor, but also the height adjustment cannot be achieved.

[0004] Therefore, there is an urgent need to design a multi-degree-of-freedom magnetorheological vibration isolation device that can achieve multi-degree-of-freedom vibration control and height adjustment. Summary of the invention

[0005] In view of this, the present invention provides a multi-degree-of-freedom magnetorheological vibration isolation device, which is based on magnetorheological technology and improves the vibration reduction principle and structure to achieve multi-degree-of-freedom vibration control.

[0006] The multi-degree-of-freedom magnetorheological vibration isolation device provided by the present invention adopts the following technical solution:

[0007] A multi-degree-of-freedom magnetorheological vibration isolation device comprises a vibration isolation member, a cylinder and a driving member, wherein the vibration isolation member has an airbag portion, the volume of the airbag portion is expandable and contractible, the airbag portion has a vibration reduction chamber for accommodating a medium, a piston and a magnetorheological valve are slidably arranged in the cylinder, at least one piston is arranged, a coil is wound around the magnetorheological valve, and a damping force is generated when the coil is energized, the piston and the magnetorheological valve divide the cylinder into a plurality of piston chambers, the piston chambers store a medium, the medium in the piston chamber and the medium in the vibration reduction chamber flow mutually, the driving member is used to drive the piston to move, and the driving member drives the piston to move to expand or contract the airbag portion.

[0008] Optionally, the piston includes a piston body and a floating piston, the piston body and the floating piston are slidingly arranged in the cylinder, and the piston body, the floating piston and the magnetorheological valve divide the cylinder into a plurality of piston chambers.

[0009] Optionally, the piston chamber includes Chamber One, Chamber Two, Chamber Three, Chamber Four, and Chamber Five arranged in sequence from top to bottom along the axial direction of the cylinder barrel. The medium in Chamber One communicates with the medium in the vibration damping chamber. The floating piston includes Floating Piston One and Floating Piston Two arranged in sequence from top to bottom along the axial direction of the cylinder barrel. The piston body is located below Floating Piston Two, and the magnetorheological valve is located between Floating Piston One and Floating Piston Two.

[0010] Optionally, the filling media in Chamber One and the vibration damping chamber are the same.

[0011] Optionally, the media filled in Chamber One and the vibration damping chamber include air or water, the media filled in Chamber Two and Chamber Three is magnetorheological fluid, and the media filled in Chamber Four is inert gas, including air, inert gas, or liquid.

[0012] Optionally, the media filled in Chamber One and the vibration damping chamber include air or water, the media filled in Chamber Two and Chamber Three is magnetorheological fluid, and the media filled in Chamber Four is inert gas, including air, inert gas, or liquid.

[0013] Optionally, the media filled in Chamber One and the vibration damping chamber include air or water, the media filled in Chamber Two and Chamber Three is magnetorheological fluid, and the media filled in Chamber Four is inert gas.

[0014] Optionally, a connecting pipe is provided between the vibration damping chamber and Chamber One, and the media in the vibration damping chamber and the media in Chamber One communicate through the connecting pipe.

[0015] Optionally, a guiding belt is provided between the outer contour of the piston and the inner wall of the cylinder barrel.

[0016] Optionally, the driving member includes a driving source and a lead screw. The lead screw is rotationally connected to the piston body, and the driving source is used to drive the lead screw to rotate.

[0017] In summary, the present invention includes at least one of the following beneficial technical effects: The energization of the coil on the magnetorheological valve generates a magnetic field. The magnetorheological fluid is magnetized by the magnetic field and exhibits the characteristics of high viscosity and low fluidity, providing damping force for the entire device. By pushing the piston to squeeze the piston chamber, the medium enters the vibration isolation chamber, changing the volume and pressure of the airbag part, thereby changing the overall stiffness and achieving the effect of overall vibration damping. Description of the Drawings

[0018] Figure 1 is the overall structural schematic diagram of the embodiment of the present invention;

[0019] Figure 2 is the structural schematic diagram of the vibration damping member of the embodiment of the present invention;

[0020] Figure 3 It is a schematic structural diagram of a cylinder barrel according to an embodiment of the present invention;

[0021] Figure 4 It is a schematic structural diagram of a magnetorheological valve according to an embodiment of the present invention.

[0022] Description of reference numerals: 1, upper vibration isolator; 2, lower vibration isolator; 3, connecting pipe; 4, cylinder barrel; 5, guide band; 6, first floating piston; 7, magnetorheological valve; 8, coil; 9, second floating piston; 10, piston body; 11, nut; 12, lead screw; 13, sealing ring; 14, coupling; 15, drive source; 16, airbag part; 17, first chamber; 18, second chamber; 19, third chamber; 20, fourth chamber; 21, fifth chamber. Detailed implementation manners

[0023] The following further describes the present invention in detail with reference to the Figures 1-4 accompanying drawings.

[0024] An embodiment of the present invention discloses a multi-degree-of-freedom magnetorheological vibration isolation device.

[0025] Referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 , a multi-degree-of-freedom magnetorheological vibration isolation device includes a vibration isolator, a cylinder barrel 4 and a driving member. The vibration isolator has an airbag part 16, the volume of the airbag part 16 is adjustable, the airbag part 16 has a damping chamber for accommodating a medium. A piston and a magnetorheological valve 7 are slidably arranged in the cylinder barrel 4. At least one piston is provided. A coil 8 is wound around the magnetorheological valve 7. After the coil 8 is energized, a damping force is generated. The piston and the magnetorheological valve 7 divide the cylinder barrel 4 to form a plurality of piston chambers. The piston chambers store a medium, and the medium in the piston chambers and the medium in the damping chamber communicate with each other. The driving member is used to drive the piston to move. When the driving member drives the piston to move, the airbag part 16 expands or contracts. The energization of the coil 8 on the magnetorheological valve 7 generates a magnetic field. The magnetorheological fluid exhibits the characteristics of high viscosity and low fluidity after being magnetized by the magnetic field, providing a damping force for the entire device. By pushing the piston to squeeze the piston chamber, the medium enters the vibration isolation chamber, changing the volume and pressure of the airbag part 16, thereby changing the overall stiffness and achieving the overall vibration isolation effect.

[0026] In this embodiment, the vibration isolator is divided into an upper and lower layer, and the vibration isolator includes an upper vibration isolator 1 and a lower vibration isolator 2 which are arranged in an upper and lower manner. The upper vibration isolator 1 is located above the lower vibration isolator 2, and the airbag portion 16 is arranged on the lower vibration isolator 2. The airbag portion 16 adopts an airbag and can expand or contract. The fitting surfaces of the upper vibration isolator 1 and the airbag portion 16 are provided with a plurality of concave spherical surfaces, and the airbag portion 16 is provided with a convex spherical surface which cooperates with the concave spherical surface. Specifically, the upper vibration damper has m×n (m rows and n columns) concave spherical surfaces, and the lower vibration damper is filled with gas or liquid to form m×n convex spherical surfaces which cooperate with the concave spherical surfaces of the upper layer.

[0027] In this embodiment, the vibration isolator is made of rubber material, and the convex spherical surface cooperates with the concave spherical surface. When subjected to force, the convex spherical surface deforms to achieve vibration reduction and vibration isolation with multiple degrees of freedom. Since the vibration isolator is made of rubber material, the convex spherical surface of the lower layer can deform in different directions when subjected to force, thereby achieving vibration reduction and vibration isolation with six degrees of freedom (up, down, left, right, front, and back). The number of convex spherical surfaces and concave spherical surfaces can be designed according to the needs of the user, and the number and size of the airbags can be changed under different working conditions. The concave spherical surface structure of the upper layer of the vibration isolator cooperates with the convex spherical surface structure of the lower layer to convert the vibration of the six degrees of freedom into the change of liquid volume, which has a good vibration reduction effect, and the overall height adjustment of the vibration isolator can be achieved through the expansion or contraction of the airbag part 16.

[0028] In this embodiment, a connecting pipe 3 is provided between the vibration reduction chamber and the chamber 17, and the medium of the vibration reduction chamber and the medium of the chamber 17 flow through the connecting pipe 3. Specifically, a threaded opening is fixedly provided on the vibration isolator and the cylinder 4, and the threaded opening is connected to the connecting pipe 3 to release and replenish the medium, thereby realizing the flow of the medium in the vibration reduction chamber and the piston chamber. The connection between the connecting pipe 3 and the vibration isolator and the cylinder 4 is sealed.

[0029] In this embodiment, the interior of the cylinder 4 is hollow to form a piston chamber, and the piston includes a piston body 10 and a floating piston. The piston body 10 and the floating piston are slidingly arranged in the cylinder 4. The piston body 10, the floating piston and the magnetorheological valve 7 divide the cylinder 4 into multiple piston chambers.

[0030] In this embodiment, the piston chamber includes chamber 17, chamber 2 18, chamber 3 19, chamber 4 20 and chamber 5 21 which are arranged in sequence from top to bottom along the axial direction of the cylinder 4. The medium of chamber 17 and the medium of the damping chamber flow with each other. The floating piston includes floating piston 1 6 and floating piston 2 9 which are arranged in sequence from top to bottom along the axial direction of the cylinder 4. The piston body 10 is located below the floating piston 2 9, and the magnetorheological valve 7 is located between the floating piston 1 6 and the floating piston 2 9.

[0031] Among them, the filling medium in chamber one 17 and the vibration damping chamber is the same. Specifically, the filling medium in chamber one 17 and the vibration damping chamber includes air or water, the filling medium in chamber two 18 and chamber three 19 is magnetorheological fluid, and the filling medium in chamber four 20 is inert gas.

[0032] Specifically, chamber two 18 and chamber three 19 are separated by a magnetorheological valve 7, and magnetorheological fluid is filled in chamber two 18 and chamber three 19 to provide damping force.

[0033] In this embodiment, inert gas is filled in chamber four 20, and the inert gas is preferably nitrogen. When the driving member pushes the piston body 10, the piston body 10 provides an upward force to push the floating piston two 9, so that the magnetorheological fluid flows through the magnetorheological valve 7 to generate damping force.

[0034] Chamber five 21 is a rod chamber. The driving member includes a driving source 15 and a lead screw 12. The driving source 15 is a motor. The motor is connected to the lead screw 12 through a coupling 14. The lead screw 12 is rotatably connected to the piston body 10. The driving source 15 is used to drive the lead screw 12 to rotate. A nut 11 is provided at the bottom of the piston body 10. The nut 11 is threadedly connected to the lead screw 12. A receiving cavity for receiving the lead screw 12 is provided at the bottom of the piston body 10. The lead screw 12 can extend into the receiving cavity through the nut 11. When the lead screw 12 rotates, the nut 11 will slide on the thread of the lead screw 12, thereby realizing linear motion.

[0035] A sealing ring 13 is provided at the bottom opening of the cylinder barrel 4 to fill the gap between the lead screw 12 and the inner wall of the opening of the cylinder barrel 4, improving the sealing effect.

[0036] A coil 8 is wound around the outer groove of the magnetorheological valve 7. When the coil 8 is energized, a magnetic field can be generated around the coil 8. The magnetic field changes the damping force of the magnetorheological fluid flowing through the gap, thereby changing the pressure in chamber one 17 of the cylinder barrel 4, further changing the pressure of the lower vibration isolation member 2, and achieving the effect of changing the stiffness of the vibration isolation member by energizing the coil 8, realizing vibration reduction and isolation.

[0037] A guide strip 5 is provided between the outer contour of the piston and the inner wall of the cylinder barrel 4. The guide strip 5 plays a role in preventing wear between the cylinder barrel 4 and the piston, improving the sealing performance and guiding function, can absorb the radial changes in vibration performance at any time, and the guide strip 5 can avoid metal contact between the piston in the cylinder and the cylinder block.

[0038] By controlling the start and stop of the motor, the lead screw 12 is driven to push the lower piston body 10, and the magnetorheological fluid in the middle cavity is extruded through the magnetorheological valve 7. When the coil 8 on the magnetorheological valve 7 is energized, a magnetic field is generated. The magnetorheological fluid shows the characteristics of high viscosity and low fluidity after being magnetized by the magnetic field, providing damping force for the whole structure. At the same time, the upper floating piston is pushed to extrude the medium in the first chamber 17, which enters the vibration isolator through the pipeline, changing the volume and pressure of the airbag part 16 in the vibration isolator, thereby changing the overall stiffness, achieving the effect of overall vibration reduction, and realizing adjustable damping through the magnetorheological valve 7.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A multi-degree-of-freedom magnetorheological vibration isolation device, characterized in that: It includes a vibration isolator, a cylinder and a driving member. The vibration isolator has an airbag part, the volume of the airbag part is expandable and contractible, the airbag part has a vibration reduction chamber for accommodating a medium, a piston and a magnetorheological valve are slidably arranged in the cylinder, at least one piston is arranged, a coil is wound around the magnetorheological valve, and a damping force is generated when the coil is energized, the piston and the magnetorheological valve separate the cylinder into a plurality of piston chambers, the piston chambers store a medium, the medium in the piston chamber and the medium in the vibration reduction chamber flow mutually, the driving member is used to drive the piston to move, and the driving member drives the piston to move to expand or contract the airbag part.

2. The multi-degree-of-freedom magnetorheological vibration isolation device according to claim 1, characterized in that: The piston comprises a piston body and a floating piston. The piston body and the floating piston are slidingly matched and arranged in a cylinder. The piston body, the floating piston and the magnetorheological valve divide the cylinder into a plurality of piston chambers.

3. The multi-degree-of-freedom magnetorheological vibration isolation device according to claim 2, characterized in that: The piston chamber includes chamber one, chamber two, chamber three, chamber four and chamber five which are arranged in sequence from top to bottom along the axial direction of the cylinder barrel. The medium in chamber one and the medium in the damping chamber flow together. The floating piston includes floating piston one and floating piston two which are arranged in sequence from top to bottom along the axial direction of the cylinder barrel. The piston body is located below the floating piston two. The magnetorheological valve is located between the floating piston one and the floating piston two.

4. The multi-degree-of-freedom magnetorheological vibration isolation device according to claim 3 is characterized in that: The filling medium of the chamber 1 and the vibration-damping chamber is the same.

5. The multi-degree-of-freedom magnetorheological vibration isolation device according to claim 4, characterized in that: The medium filled in the chamber 1 and the vibration-damping chamber includes air or water, the medium filled in the chamber 2 and the chamber 3 is magnetorheological fluid, and the medium filled in the chamber 4 is an inert gas.

6. The multi-degree-of-freedom magnetorheological vibration isolation device according to claim 1, characterized in that: The vibration isolator comprises an upper vibration isolator and a lower vibration isolator which are arranged one above the other. The airbag part is arranged on the lower vibration isolator. The fitting surfaces of the upper vibration isolator and the airbag part are provided with a plurality of concave spherical surfaces. The airbag part is provided with a convex spherical surface which matches with the concave spherical surface.

7. The multi-degree-of-freedom magnetorheological vibration isolation device according to claim 6, characterized in that: The vibration isolating member is made of rubber material, and the convex spherical surface cooperates with the concave spherical surface. When subjected to force, the convex spherical surface deforms to achieve vibration reduction and isolation with multiple degrees of freedom.

8. The multi-degree-of-freedom magnetorheological vibration isolation device according to claim 3, characterized in that: A connecting pipe is provided between the vibration-damping chamber and the first chamber, and the medium in the vibration-damping chamber and the medium in the first chamber flow through the connecting pipe.

9. The multi-degree-of-freedom magnetorheological vibration isolation device according to claim 1, characterized in that: A guide belt is arranged between the outer contour of the piston and the inner wall of the cylinder.

10. The multi-degree-of-freedom magnetorheological vibration isolation device according to claim 1, characterized in that: The driving member includes a driving source and a lead screw, the lead screw is rotatably connected to the piston body, and the driving source is used to drive the lead screw to rotate.

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